1aa1f3bb5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * USB hub driver. 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 61da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 71da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 81da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 91da177e4SLinus Torvalds * 10b65fba3dSGreg Kroah-Hartman * Released under the GPLv2 only. 111da177e4SLinus Torvalds */ 121da177e4SLinus Torvalds 131da177e4SLinus Torvalds #include <linux/kernel.h> 141da177e4SLinus Torvalds #include <linux/errno.h> 151da177e4SLinus Torvalds #include <linux/module.h> 161da177e4SLinus Torvalds #include <linux/moduleparam.h> 171da177e4SLinus Torvalds #include <linux/completion.h> 185b3cc15aSIngo Molnar #include <linux/sched/mm.h> 191da177e4SLinus Torvalds #include <linux/list.h> 201da177e4SLinus Torvalds #include <linux/slab.h> 2195d23dc2SAndrey Konovalov #include <linux/kcov.h> 221da177e4SLinus Torvalds #include <linux/ioctl.h> 231da177e4SLinus Torvalds #include <linux/usb.h> 241da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 2527729aadSEric Lescouet #include <linux/usb/hcd.h> 26925aa46bSRichard Zhao #include <linux/usb/otg.h> 2793362a87SPhil Dibowitz #include <linux/usb/quirks.h> 2832a69589SPetr Mladek #include <linux/workqueue.h> 294186ecf8SArjan van de Ven #include <linux/mutex.h> 30b04b3156STheodore Ts'o #include <linux/random.h> 31ad493e5eSLan Tianyu #include <linux/pm_qos.h> 32201af55dSJon Flatley #include <linux/kobject.h> 331da177e4SLinus Torvalds 340299809bSThinh Nguyen #include <linux/bitfield.h> 357c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 361da177e4SLinus Torvalds #include <asm/byteorder.h> 371da177e4SLinus Torvalds 386e30d7cbSLan Tianyu #include "hub.h" 39f8f02d5cSGreg Kroah-Hartman #include "otg_productlist.h" 401da177e4SLinus Torvalds 41e6f30deaSMing Lei #define USB_VENDOR_GENESYS_LOGIC 0x05e3 421208f9e1SHardik Gajjar #define USB_VENDOR_SMSC 0x0424 4376e1ef1dSEugeniu Rosca #define USB_PRODUCT_USB5534B 0x5534 44e6f30deaSMing Lei #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 451208f9e1SHardik Gajjar #define HUB_QUIRK_DISABLE_AUTOSUSPEND 0x02 46e6f30deaSMing Lei 47886ee36eSFelipe Balbi #define USB_TP_TRANSMISSION_DELAY 40 /* ns */ 48886ee36eSFelipe Balbi #define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */ 49886ee36eSFelipe Balbi 50fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 519ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 521da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 531da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 541da177e4SLinus Torvalds 5532a69589SPetr Mladek /* workqueue to process hub events */ 5632a69589SPetr Mladek static struct workqueue_struct *hub_wq; 5732a69589SPetr Mladek static void hub_event(struct work_struct *work); 581da177e4SLinus Torvalds 59d8521afeSDan Williams /* synchronize hub-port add/remove and peering operations */ 60d8521afeSDan Williams DEFINE_MUTEX(usb_port_peer_mutex); 61d8521afeSDan Williams 621da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 63a44007a4SSaurabh Sengar static bool blinkenlights; 641da177e4SLinus Torvalds module_param(blinkenlights, bool, S_IRUGO); 651da177e4SLinus Torvalds MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds /* 68fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 69fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 70fd7c519dSJaroslav Kysela */ 71fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 72fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 73fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 74b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 75b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 76b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 77fd7c519dSJaroslav Kysela 78fd7c519dSJaroslav Kysela /* 791da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 801da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 811da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 821da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 831da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 841da177e4SLinus Torvalds * following module parameters. 851da177e4SLinus Torvalds * 861da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 871da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 881da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 891da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 901da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 911da177e4SLinus Torvalds */ 92a44007a4SSaurabh Sengar static bool old_scheme_first; 931da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 941da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 951da177e4SLinus Torvalds "start with the old device initialization scheme"); 961da177e4SLinus Torvalds 97b9cf2cb5SJason Yan static bool use_both_schemes = true; 981da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 991da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 1001da177e4SLinus Torvalds "try the other device initialization scheme if the " 1011da177e4SLinus Torvalds "first one fails"); 1021da177e4SLinus Torvalds 10332fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 10432fe0198SAlan Stern * port reset on some companion controllers. 10532fe0198SAlan Stern */ 10632fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 10732fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 10832fe0198SAlan Stern 109ad493e5eSLan Tianyu #define HUB_DEBOUNCE_TIMEOUT 2000 110948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 111948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 112948fea37SAlan Stern 11332a69589SPetr Mladek static void hub_release(struct kref *kref); 114742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 1153bc02bceSGeert Uytterhoeven static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); 1164fdc1790SJan-Marek Glogowski static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, 1174fdc1790SJan-Marek Glogowski u16 portstatus); 118742120c6SMing Lei 119131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1201da177e4SLinus Torvalds { 121d64aab0cSOliver Neukum if (hub_is_superspeedplus(hub->hdev)) 122d64aab0cSOliver Neukum return "10.0 Gb/s"; 123131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 124131dec34SSarah Sharp return "5.0 Gb/s"; 125288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1261da177e4SLinus Torvalds return "480 Mb/s"; 127288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1281da177e4SLinus Torvalds return "1.5 Mb/s"; 1291da177e4SLinus Torvalds else 1301da177e4SLinus Torvalds return "12 Mb/s"; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 134ad493e5eSLan Tianyu struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) 1351da177e4SLinus Torvalds { 136ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 13725118084SAlan Stern return NULL; 1381da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1391da177e4SLinus Torvalds } 1401da177e4SLinus Torvalds 1412d2a3167SLu Baolu int usb_device_supports_lpm(struct usb_device *udev) 142d9b2099cSSarah Sharp { 143ad87e032SAlan Stern /* Some devices have trouble with LPM */ 144ad87e032SAlan Stern if (udev->quirks & USB_QUIRK_NO_LPM) 145ad87e032SAlan Stern return 0; 146ad87e032SAlan Stern 147d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 148d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 149d9b2099cSSarah Sharp */ 150a8425292SRupesh Tatiya if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { 151d9b2099cSSarah Sharp if (udev->bos->ext_cap && 152d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 153d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 154d9b2099cSSarah Sharp return 1; 155d9b2099cSSarah Sharp return 0; 156d9b2099cSSarah Sharp } 15751e0a012SSarah Sharp 15825cd2882SSarah Sharp /* 15925cd2882SSarah Sharp * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. 16025cd2882SSarah Sharp * However, there are some that don't, and they set the U1/U2 exit 16125cd2882SSarah Sharp * latencies to zero. 16251e0a012SSarah Sharp */ 16351e0a012SSarah Sharp if (!udev->bos->ss_cap) { 16425cd2882SSarah Sharp dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); 165d9b2099cSSarah Sharp return 0; 166d9b2099cSSarah Sharp } 16751e0a012SSarah Sharp 16825cd2882SSarah Sharp if (udev->bos->ss_cap->bU1devExitLat == 0 && 16925cd2882SSarah Sharp udev->bos->ss_cap->bU2DevExitLat == 0) { 17025cd2882SSarah Sharp if (udev->parent) 17125cd2882SSarah Sharp dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); 17225cd2882SSarah Sharp else 17325cd2882SSarah Sharp dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); 17425cd2882SSarah Sharp return 0; 17525cd2882SSarah Sharp } 17625cd2882SSarah Sharp 17725cd2882SSarah Sharp if (!udev->parent || udev->parent->lpm_capable) 17825cd2882SSarah Sharp return 1; 17951e0a012SSarah Sharp return 0; 18051e0a012SSarah Sharp } 18151e0a012SSarah Sharp 18251e0a012SSarah Sharp /* 18351e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 18451e0a012SSarah Sharp * either U1 or U2. 18551e0a012SSarah Sharp */ 18651e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 18751e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 18851e0a012SSarah Sharp unsigned int udev_exit_latency, 18951e0a012SSarah Sharp struct usb_hub *hub, 19051e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 19151e0a012SSarah Sharp unsigned int hub_exit_latency) 19251e0a012SSarah Sharp { 19351e0a012SSarah Sharp unsigned int total_mel; 19451e0a012SSarah Sharp unsigned int device_mel; 19551e0a012SSarah Sharp unsigned int hub_mel; 19651e0a012SSarah Sharp 19751e0a012SSarah Sharp /* 19851e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 19951e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 20051e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 20151e0a012SSarah Sharp * bound for. 20251e0a012SSarah Sharp * 20351e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 20451e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 20551e0a012SSarah Sharp */ 20651e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 20751e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 20851e0a012SSarah Sharp 20951e0a012SSarah Sharp /* 21051e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 21151e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 21251e0a012SSarah Sharp * latency. 21351e0a012SSarah Sharp * 21451e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 21551e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 21651e0a012SSarah Sharp */ 21751e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 21851e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 21951e0a012SSarah Sharp if (device_mel > hub_mel) 22051e0a012SSarah Sharp total_mel += device_mel; 22151e0a012SSarah Sharp else 22251e0a012SSarah Sharp total_mel += hub_mel; 22351e0a012SSarah Sharp 22451e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 22551e0a012SSarah Sharp } 22651e0a012SSarah Sharp 22751e0a012SSarah Sharp /* 22851e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 22951e0a012SSarah Sharp * a transition from either U1 or U2. 23051e0a012SSarah Sharp */ 23151e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 23251e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 23351e0a012SSarah Sharp unsigned int udev_exit_latency, 23451e0a012SSarah Sharp struct usb_hub *hub, 23551e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 23651e0a012SSarah Sharp unsigned int hub_exit_latency, 23751e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 23851e0a012SSarah Sharp { 23951e0a012SSarah Sharp unsigned int first_link_pel; 24051e0a012SSarah Sharp unsigned int hub_pel; 24151e0a012SSarah Sharp 24251e0a012SSarah Sharp /* 24351e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 24451e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 24551e0a012SSarah Sharp * the device exit latency or the hub exit latency. 24651e0a012SSarah Sharp */ 24751e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 24851e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 24951e0a012SSarah Sharp else 25051e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 25151e0a012SSarah Sharp 25251e0a012SSarah Sharp /* 25351e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 25451e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 25551e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 25651e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 25751e0a012SSarah Sharp */ 25851e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 25951e0a012SSarah Sharp 26051e0a012SSarah Sharp /* 26151e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 26251e0a012SSarah Sharp * is the greater of the two exit latencies. 26351e0a012SSarah Sharp */ 26451e0a012SSarah Sharp if (first_link_pel > hub_pel) 26551e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 26651e0a012SSarah Sharp else 26751e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 26851e0a012SSarah Sharp } 26951e0a012SSarah Sharp 27051e0a012SSarah Sharp /* 27151e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 27251e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 27351e0a012SSarah Sharp * first packet from the host controller. 27451e0a012SSarah Sharp * 27551e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 27651e0a012SSarah Sharp * - t1: device PEL 27751e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 27851e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 27951e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 28051e0a012SSarah Sharp * 28151e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 28251e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 28351e0a012SSarah Sharp * vendor says otherwise. 28451e0a012SSarah Sharp */ 28551e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 28651e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 28751e0a012SSarah Sharp { 28851e0a012SSarah Sharp struct usb_device *parent; 28951e0a012SSarah Sharp unsigned int num_hubs; 29051e0a012SSarah Sharp unsigned int total_sel; 29151e0a012SSarah Sharp 29251e0a012SSarah Sharp /* t1 = device PEL */ 29351e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 29451e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 29551e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 29651e0a012SSarah Sharp parent = parent->parent) 29751e0a012SSarah Sharp num_hubs++; 29851e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 29951e0a012SSarah Sharp if (num_hubs > 0) 30051e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 30151e0a012SSarah Sharp 30251e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 30351e0a012SSarah Sharp total_sel += 250 * num_hubs; 30451e0a012SSarah Sharp 30551e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 30651e0a012SSarah Sharp } 30751e0a012SSarah Sharp 30851e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 30951e0a012SSarah Sharp { 31051e0a012SSarah Sharp struct usb_hub *hub; 31151e0a012SSarah Sharp unsigned int port_to_port_delay; 31251e0a012SSarah Sharp unsigned int udev_u1_del; 31351e0a012SSarah Sharp unsigned int udev_u2_del; 31451e0a012SSarah Sharp unsigned int hub_u1_del; 31551e0a012SSarah Sharp unsigned int hub_u2_del; 31651e0a012SSarah Sharp 3178a1b2725SMathias Nyman if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) 31851e0a012SSarah Sharp return; 31951e0a012SSarah Sharp 320ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 32151e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 32251e0a012SSarah Sharp * doesn't have an upstream link. 32351e0a012SSarah Sharp */ 32451e0a012SSarah Sharp if (!hub) 32551e0a012SSarah Sharp return; 32651e0a012SSarah Sharp 32751e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3284d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 32951e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3304d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 33151e0a012SSarah Sharp 33251e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 33351e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 33451e0a012SSarah Sharp 33551e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 33651e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 33751e0a012SSarah Sharp 33851e0a012SSarah Sharp /* 33951e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 34051e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 34151e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 34251e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 34351e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 34451e0a012SSarah Sharp * 34551e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 34651e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 34751e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 34851e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 34951e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 35051e0a012SSarah Sharp * exit latencies. 35151e0a012SSarah Sharp * 35251e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 35351e0a012SSarah Sharp * latency? It's possible, although not likely... 35451e0a012SSarah Sharp */ 35551e0a012SSarah Sharp port_to_port_delay = 1; 35651e0a012SSarah Sharp 35751e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 35851e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 35951e0a012SSarah Sharp port_to_port_delay); 36051e0a012SSarah Sharp 36151e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 36251e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 36351e0a012SSarah Sharp else 36451e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 36551e0a012SSarah Sharp 36651e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 36751e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 36851e0a012SSarah Sharp port_to_port_delay); 36951e0a012SSarah Sharp 37051e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 37151e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 37251e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 37351e0a012SSarah Sharp } 374d9b2099cSSarah Sharp 3751da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 376bec444cdSJohan Hovold static int get_hub_descriptor(struct usb_device *hdev, 377bec444cdSJohan Hovold struct usb_hub_descriptor *desc) 3781da177e4SLinus Torvalds { 379dbe79bbeSJohn Youn int i, ret, size; 380dbe79bbeSJohn Youn unsigned dtype; 381dbe79bbeSJohn Youn 382dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 383dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 384dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 385dbe79bbeSJohn Youn } else { 386dbe79bbeSJohn Youn dtype = USB_DT_HUB; 387dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 388dbe79bbeSJohn Youn } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3911da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3921da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 393bec444cdSJohan Hovold dtype << 8, 0, desc, size, 3941da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3952c25a2c8SJohan Hovold if (hub_is_superspeed(hdev)) { 3962c25a2c8SJohan Hovold if (ret == size) 3971da177e4SLinus Torvalds return ret; 398bec444cdSJohan Hovold } else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) { 399bec444cdSJohan Hovold /* Make sure we have the DeviceRemovable field. */ 400bec444cdSJohan Hovold size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1; 401bec444cdSJohan Hovold if (ret < size) 402bec444cdSJohan Hovold return -EMSGSIZE; 4032c25a2c8SJohan Hovold return ret; 4042c25a2c8SJohan Hovold } 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds return -EINVAL; 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds /* 4101da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 4111da177e4SLinus Torvalds */ 4121da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 4131da177e4SLinus Torvalds { 4141afe33a7SOliver Neukum return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4151afe33a7SOliver Neukum USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds /* 4191da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 4201da177e4SLinus Torvalds */ 421ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 4221da177e4SLinus Torvalds { 4231afe33a7SOliver Neukum return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4241afe33a7SOliver Neukum USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4251afe33a7SOliver Neukum NULL, 0, 1000); 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds /* 4291da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4301da177e4SLinus Torvalds */ 4311da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4321da177e4SLinus Torvalds { 4331afe33a7SOliver Neukum return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4341afe33a7SOliver Neukum USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4351afe33a7SOliver Neukum NULL, 0, 1000); 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 438d99f6b41SDan Williams static char *to_led_name(int selector) 439d99f6b41SDan Williams { 440d99f6b41SDan Williams switch (selector) { 441d99f6b41SDan Williams case HUB_LED_AMBER: 442d99f6b41SDan Williams return "amber"; 443d99f6b41SDan Williams case HUB_LED_GREEN: 444d99f6b41SDan Williams return "green"; 445d99f6b41SDan Williams case HUB_LED_OFF: 446d99f6b41SDan Williams return "off"; 447d99f6b41SDan Williams case HUB_LED_AUTO: 448d99f6b41SDan Williams return "auto"; 449d99f6b41SDan Williams default: 450d99f6b41SDan Williams return "??"; 451d99f6b41SDan Williams } 452d99f6b41SDan Williams } 453d99f6b41SDan Williams 4541da177e4SLinus Torvalds /* 4551da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4561da177e4SLinus Torvalds * for info about using port indicators 4571da177e4SLinus Torvalds */ 458d99f6b41SDan Williams static void set_port_led(struct usb_hub *hub, int port1, int selector) 4591da177e4SLinus Torvalds { 460d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 461d99f6b41SDan Williams int status; 462d99f6b41SDan Williams 463d99f6b41SDan Williams status = set_port_feature(hub->hdev, (selector << 8) | port1, 4641da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 465d99f6b41SDan Williams dev_dbg(&port_dev->dev, "indicator %s status %d\n", 466d99f6b41SDan Williams to_led_name(selector), status); 4671da177e4SLinus Torvalds } 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4701da177e4SLinus Torvalds 471c4028958SDavid Howells static void led_work(struct work_struct *work) 4721da177e4SLinus Torvalds { 473c4028958SDavid Howells struct usb_hub *hub = 474c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4751da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4761da177e4SLinus Torvalds unsigned i; 4771da177e4SLinus Torvalds unsigned changed = 0; 4781da177e4SLinus Torvalds int cursor = -1; 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4811da177e4SLinus Torvalds return; 4821da177e4SLinus Torvalds 4833bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4841da177e4SLinus Torvalds unsigned selector, mode; 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds switch (hub->indicator[i]) { 4891da177e4SLinus Torvalds /* cycle marker */ 4901da177e4SLinus Torvalds case INDICATOR_CYCLE: 4911da177e4SLinus Torvalds cursor = i; 4921da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4931da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4941da177e4SLinus Torvalds break; 4951da177e4SLinus Torvalds /* blinking green = sw attention */ 4961da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4971da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4981da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4991da177e4SLinus Torvalds break; 5001da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 5011da177e4SLinus Torvalds selector = HUB_LED_OFF; 5021da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 5031da177e4SLinus Torvalds break; 5041da177e4SLinus Torvalds /* blinking amber = hw attention */ 5051da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 5061da177e4SLinus Torvalds selector = HUB_LED_AMBER; 5071da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 5081da177e4SLinus Torvalds break; 5091da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 5101da177e4SLinus Torvalds selector = HUB_LED_OFF; 5111da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 5121da177e4SLinus Torvalds break; 5131da177e4SLinus Torvalds /* blink green/amber = reserved */ 5141da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 5151da177e4SLinus Torvalds selector = HUB_LED_GREEN; 5161da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 5171da177e4SLinus Torvalds break; 5181da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 5191da177e4SLinus Torvalds selector = HUB_LED_AMBER; 5201da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 5211da177e4SLinus Torvalds break; 5221da177e4SLinus Torvalds default: 5231da177e4SLinus Torvalds continue; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 5261da177e4SLinus Torvalds changed = 1; 5271da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 5281da177e4SLinus Torvalds hub->indicator[i] = mode; 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds if (!changed && blinkenlights) { 5311da177e4SLinus Torvalds cursor++; 5323bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5331da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5341da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5351da177e4SLinus Torvalds changed++; 5361da177e4SLinus Torvalds } 5371da177e4SLinus Torvalds if (changed) 53822f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 53922f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 5401da177e4SLinus Torvalds } 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5431da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5441da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds /* 5471da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5481da177e4SLinus Torvalds */ 5491da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5501da177e4SLinus Torvalds struct usb_hub_status *data) 5511da177e4SLinus Torvalds { 5521da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5531da177e4SLinus Torvalds 5543824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5553824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5561da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5571da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5581da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds return status; 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds /* 5641da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5650cdd49a1SMathias Nyman * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 5661da177e4SLinus Torvalds */ 5671da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5680cdd49a1SMathias Nyman void *data, u16 value, u16 length) 5691da177e4SLinus Torvalds { 5701da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5711da177e4SLinus Torvalds 5723824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5733824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5741da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5750cdd49a1SMathias Nyman USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, 5760cdd49a1SMathias Nyman port1, data, length, USB_STS_TIMEOUT); 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds return status; 5791da177e4SLinus Torvalds } 5801da177e4SLinus Torvalds 5810cdd49a1SMathias Nyman static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, 5820cdd49a1SMathias Nyman u16 *status, u16 *change, u32 *ext_status) 5833eb14915SAlan Stern { 5843eb14915SAlan Stern int ret; 5850cdd49a1SMathias Nyman int len = 4; 5860cdd49a1SMathias Nyman 5870cdd49a1SMathias Nyman if (type != HUB_PORT_STATUS) 5880cdd49a1SMathias Nyman len = 8; 5893eb14915SAlan Stern 5903eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5910cdd49a1SMathias Nyman ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); 5920cdd49a1SMathias Nyman if (ret < len) { 593e9e88fb7SAlan Stern if (ret != -ENODEV) 5943eb14915SAlan Stern dev_err(hub->intfdev, 5953eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5963eb14915SAlan Stern if (ret >= 0) 5973eb14915SAlan Stern ret = -EIO; 5983eb14915SAlan Stern } else { 5993eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 6003eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 6010cdd49a1SMathias Nyman if (type != HUB_PORT_STATUS && ext_status) 6020cdd49a1SMathias Nyman *ext_status = le32_to_cpu( 6030cdd49a1SMathias Nyman hub->status->port.dwExtPortStatus); 6043eb14915SAlan Stern ret = 0; 6053eb14915SAlan Stern } 6063eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 6073eb14915SAlan Stern return ret; 6083eb14915SAlan Stern } 6093eb14915SAlan Stern 6100cdd49a1SMathias Nyman static int hub_port_status(struct usb_hub *hub, int port1, 6110cdd49a1SMathias Nyman u16 *status, u16 *change) 6120cdd49a1SMathias Nyman { 6130cdd49a1SMathias Nyman return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, 6140cdd49a1SMathias Nyman status, change, NULL); 6150cdd49a1SMathias Nyman } 6160cdd49a1SMathias Nyman 6178eb58994SNicolas Saenz Julienne static void hub_resubmit_irq_urb(struct usb_hub *hub) 6188eb58994SNicolas Saenz Julienne { 6198eb58994SNicolas Saenz Julienne unsigned long flags; 6208eb58994SNicolas Saenz Julienne int status; 6218eb58994SNicolas Saenz Julienne 6228eb58994SNicolas Saenz Julienne spin_lock_irqsave(&hub->irq_urb_lock, flags); 6238eb58994SNicolas Saenz Julienne 6248eb58994SNicolas Saenz Julienne if (hub->quiescing) { 6258eb58994SNicolas Saenz Julienne spin_unlock_irqrestore(&hub->irq_urb_lock, flags); 6268eb58994SNicolas Saenz Julienne return; 6278eb58994SNicolas Saenz Julienne } 6288eb58994SNicolas Saenz Julienne 6298eb58994SNicolas Saenz Julienne status = usb_submit_urb(hub->urb, GFP_ATOMIC); 6308eb58994SNicolas Saenz Julienne if (status && status != -ENODEV && status != -EPERM && 6318eb58994SNicolas Saenz Julienne status != -ESHUTDOWN) { 6328eb58994SNicolas Saenz Julienne dev_err(hub->intfdev, "resubmit --> %d\n", status); 6338eb58994SNicolas Saenz Julienne mod_timer(&hub->irq_urb_retry, jiffies + HZ); 6348eb58994SNicolas Saenz Julienne } 6358eb58994SNicolas Saenz Julienne 6368eb58994SNicolas Saenz Julienne spin_unlock_irqrestore(&hub->irq_urb_lock, flags); 6378eb58994SNicolas Saenz Julienne } 6388eb58994SNicolas Saenz Julienne 6398eb58994SNicolas Saenz Julienne static void hub_retry_irq_urb(struct timer_list *t) 6408eb58994SNicolas Saenz Julienne { 6418eb58994SNicolas Saenz Julienne struct usb_hub *hub = from_timer(hub, t, irq_urb_retry); 6428eb58994SNicolas Saenz Julienne 6438eb58994SNicolas Saenz Julienne hub_resubmit_irq_urb(hub); 6448eb58994SNicolas Saenz Julienne } 6458eb58994SNicolas Saenz Julienne 6468eb58994SNicolas Saenz Julienne 64732a69589SPetr Mladek static void kick_hub_wq(struct usb_hub *hub) 6481da177e4SLinus Torvalds { 64932a69589SPetr Mladek struct usb_interface *intf; 6501da177e4SLinus Torvalds 65132a69589SPetr Mladek if (hub->disconnected || work_pending(&hub->events)) 65232a69589SPetr Mladek return; 6538e4ceb38SAlan Stern 65432a69589SPetr Mladek /* 65532a69589SPetr Mladek * Suppress autosuspend until the event is proceed. 65632a69589SPetr Mladek * 65732a69589SPetr Mladek * Be careful and make sure that the symmetric operation is 65832a69589SPetr Mladek * always called. We are here only when there is no pending 65932a69589SPetr Mladek * work for this hub. Therefore put the interface either when 66032a69589SPetr Mladek * the new work is called or when it is canceled. 66132a69589SPetr Mladek */ 66232a69589SPetr Mladek intf = to_usb_interface(hub->intfdev); 66332a69589SPetr Mladek usb_autopm_get_interface_no_resume(intf); 66432a69589SPetr Mladek kref_get(&hub->kref); 66532a69589SPetr Mladek 66632a69589SPetr Mladek if (queue_work(hub_wq, &hub->events)) 66732a69589SPetr Mladek return; 66832a69589SPetr Mladek 66932a69589SPetr Mladek /* the work has already been scheduled */ 67032a69589SPetr Mladek usb_autopm_put_interface_async(intf); 67132a69589SPetr Mladek kref_put(&hub->kref, hub_release); 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 67459d48b3fSPetr Mladek void usb_kick_hub_wq(struct usb_device *hdev) 6751da177e4SLinus Torvalds { 676ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 67725118084SAlan Stern 67825118084SAlan Stern if (hub) 67932a69589SPetr Mladek kick_hub_wq(hub); 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds 6824ee823b8SSarah Sharp /* 6834ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6844ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6854ee823b8SSarah Sharp * 6864ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6874ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6884ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6894ee823b8SSarah Sharp */ 6904ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6914ee823b8SSarah Sharp unsigned int portnum) 6924ee823b8SSarah Sharp { 6934ee823b8SSarah Sharp struct usb_hub *hub; 69483a62c51SRavi Chandra Sadineni struct usb_port *port_dev; 6954ee823b8SSarah Sharp 6964ee823b8SSarah Sharp if (!hdev) 6974ee823b8SSarah Sharp return; 6984ee823b8SSarah Sharp 699ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 7004ee823b8SSarah Sharp if (hub) { 70183a62c51SRavi Chandra Sadineni port_dev = hub->ports[portnum - 1]; 70283a62c51SRavi Chandra Sadineni if (port_dev && port_dev->child) 70383a62c51SRavi Chandra Sadineni pm_wakeup_event(&port_dev->child->dev, 0); 70483a62c51SRavi Chandra Sadineni 7054ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 70632a69589SPetr Mladek kick_hub_wq(hub); 7074ee823b8SSarah Sharp } 7084ee823b8SSarah Sharp } 7094ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 7127d12e780SDavid Howells static void hub_irq(struct urb *urb) 7131da177e4SLinus Torvalds { 714ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 715e015268dSAlan Stern int status = urb->status; 71671d2718fSRoel Kluin unsigned i; 7171da177e4SLinus Torvalds unsigned long bits; 7181da177e4SLinus Torvalds 719e015268dSAlan Stern switch (status) { 7201da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 7211da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 7221da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 7231da177e4SLinus Torvalds return; 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds default: /* presumably an error */ 7261da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 727e015268dSAlan Stern dev_dbg(hub->intfdev, "transfer --> %d\n", status); 7281da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 7291da177e4SLinus Torvalds goto resubmit; 730e015268dSAlan Stern hub->error = status; 731df561f66SGustavo A. R. Silva fallthrough; 7321da177e4SLinus Torvalds 73337ebb549SPetr Mladek /* let hub_wq handle things */ 7341da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 7351da177e4SLinus Torvalds bits = 0; 7361da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 7371da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 7381da177e4SLinus Torvalds << (i*8); 7391da177e4SLinus Torvalds hub->event_bits[0] = bits; 7401da177e4SLinus Torvalds break; 7411da177e4SLinus Torvalds } 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds hub->nerrors = 0; 7441da177e4SLinus Torvalds 74537ebb549SPetr Mladek /* Something happened, let hub_wq figure it out */ 74632a69589SPetr Mladek kick_hub_wq(hub); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds resubmit: 7498eb58994SNicolas Saenz Julienne hub_resubmit_irq_urb(hub); 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 7531da177e4SLinus Torvalds static inline int 7541da177e4SLinus Torvalds hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) 7551da177e4SLinus Torvalds { 7562c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 7572c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 7582c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 7591afe33a7SOliver Neukum int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 7602c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 7612c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 7622c7b871bSWilliam Gulland if (status) 7632c7b871bSWilliam Gulland return status; 7642c7b871bSWilliam Gulland } 7651afe33a7SOliver Neukum return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 7661afe33a7SOliver Neukum HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 7671afe33a7SOliver Neukum tt, NULL, 0, 1000); 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds /* 77137ebb549SPetr Mladek * enumeration blocks hub_wq for a long time. we use keventd instead, since 7721da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 7731da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 7741da177e4SLinus Torvalds * both can talk to the same hub concurrently. 7751da177e4SLinus Torvalds */ 776cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 7771da177e4SLinus Torvalds { 778c4028958SDavid Howells struct usb_hub *hub = 779cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 7801da177e4SLinus Torvalds unsigned long flags; 7811da177e4SLinus Torvalds 7821da177e4SLinus Torvalds spin_lock_irqsave(&hub->tt.lock, flags); 7833b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 784d0f830d3SH Hartley Sweeten struct list_head *next; 7851da177e4SLinus Torvalds struct usb_tt_clear *clear; 7861da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 787cb88a1b8SAlan Stern const struct hc_driver *drv; 7881da177e4SLinus Torvalds int status; 7891da177e4SLinus Torvalds 790d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 791d0f830d3SH Hartley Sweeten clear = list_entry(next, struct usb_tt_clear, clear_list); 7921da177e4SLinus Torvalds list_del(&clear->clear_list); 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7951da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7961da177e4SLinus Torvalds status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); 797e9e88fb7SAlan Stern if (status && status != -ENODEV) 7981da177e4SLinus Torvalds dev_err(&hdev->dev, 7991da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 8001da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 801cb88a1b8SAlan Stern 802cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 803cb88a1b8SAlan Stern drv = clear->hcd->driver; 804cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 805cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 806cb88a1b8SAlan Stern 8071da177e4SLinus Torvalds kfree(clear); 808cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 8091da177e4SLinus Torvalds } 8101da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 8111da177e4SLinus Torvalds } 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds /** 814971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 81541341261SMathias Nyman * @hdev: USB device belonging to the usb hub 81641341261SMathias Nyman * @hub: target hub 817971fcd49SLan Tianyu * @port1: port index 818971fcd49SLan Tianyu * @set: expected status 819971fcd49SLan Tianyu * 820971fcd49SLan Tianyu * call this function to control port's power via setting or 821971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 822626f090cSYacine Belkadi * 823626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 824971fcd49SLan Tianyu */ 82541341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 82641341261SMathias Nyman int port1, bool set) 827971fcd49SLan Tianyu { 828971fcd49SLan Tianyu int ret; 829971fcd49SLan Tianyu 830971fcd49SLan Tianyu if (set) 831971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 832971fcd49SLan Tianyu else 833ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 834ad493e5eSLan Tianyu 835d5c3834eSDan Williams if (ret) 836971fcd49SLan Tianyu return ret; 837d5c3834eSDan Williams 838d5c3834eSDan Williams if (set) 839d5c3834eSDan Williams set_bit(port1, hub->power_bits); 840d5c3834eSDan Williams else 841d5c3834eSDan Williams clear_bit(port1, hub->power_bits); 842d5c3834eSDan Williams return 0; 843971fcd49SLan Tianyu } 844971fcd49SLan Tianyu 845971fcd49SLan Tianyu /** 846cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 847cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 8481da177e4SLinus Torvalds * 8491da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 8501da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 8511da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 8521da177e4SLinus Torvalds * interrupt context. 8531da177e4SLinus Torvalds * 8541da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 8551da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 856626f090cSYacine Belkadi * 857626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 8581da177e4SLinus Torvalds */ 859cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 8601da177e4SLinus Torvalds { 861cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 862cb88a1b8SAlan Stern int pipe = urb->pipe; 8631da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 8641da177e4SLinus Torvalds unsigned long flags; 8651da177e4SLinus Torvalds struct usb_tt_clear *clear; 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 8681da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 8691da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 8701da177e4SLinus Torvalds */ 871d544d273SGreg Kroah-Hartman clear = kmalloc(sizeof *clear, GFP_ATOMIC); 872d544d273SGreg Kroah-Hartman if (clear == NULL) { 8731da177e4SLinus Torvalds dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 8741da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 875cb88a1b8SAlan Stern return -ENOMEM; 8761da177e4SLinus Torvalds } 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 8791da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 8801da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 8814998f1efSJim Lin clear->devinfo |= ((u16)udev->devaddr) << 4; 8821da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol(pipe) 8831da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 8841da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 8851da177e4SLinus Torvalds if (usb_pipein(pipe)) 8861da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 8871da177e4SLinus Torvalds 888cb88a1b8SAlan Stern /* info for completion callback */ 889cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 890cb88a1b8SAlan Stern clear->ep = urb->ep; 891cb88a1b8SAlan Stern 8921da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8931da177e4SLinus Torvalds spin_lock_irqsave(&tt->lock, flags); 8941da177e4SLinus Torvalds list_add_tail(&clear->clear_list, &tt->clear_list); 895cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8961da177e4SLinus Torvalds spin_unlock_irqrestore(&tt->lock, flags); 897cb88a1b8SAlan Stern return 0; 8981da177e4SLinus Torvalds } 899cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 9001da177e4SLinus Torvalds 9017ad3c470SDan Williams static void hub_power_on(struct usb_hub *hub, bool do_delay) 9021da177e4SLinus Torvalds { 9031da177e4SLinus Torvalds int port1; 9041da177e4SLinus Torvalds 9054489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 9064489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 9074489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 9084489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 9094489a571SAlan Stern * unless we send these messages to the hub. 9104489a571SAlan Stern */ 9119262c19dSDan Williams if (hub_is_port_power_switchable(hub)) 9121da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 9134489a571SAlan Stern else 9144489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 9154489a571SAlan Stern "non-switchable hub\n"); 9163bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 917d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 9184489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 919ad493e5eSLan Tianyu else 920ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 921ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 9228520f380SAlan Stern if (do_delay) 9237ad3c470SDan Williams msleep(hub_power_on_good_delay(hub)); 9241da177e4SLinus Torvalds } 9251da177e4SLinus Torvalds 9261da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 9271da177e4SLinus Torvalds u16 *status, u16 *change) 9281da177e4SLinus Torvalds { 9291da177e4SLinus Torvalds int ret; 9301da177e4SLinus Torvalds 931db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 9321da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 933e9e88fb7SAlan Stern if (ret < 0) { 934e9e88fb7SAlan Stern if (ret != -ENODEV) 9351da177e4SLinus Torvalds dev_err(hub->intfdev, 936441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 937e9e88fb7SAlan Stern } else { 9381da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 9391da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 9401da177e4SLinus Torvalds ret = 0; 9411da177e4SLinus Torvalds } 942db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 9431da177e4SLinus Torvalds return ret; 9441da177e4SLinus Torvalds } 9451da177e4SLinus Torvalds 94641e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 94741e7e056SSarah Sharp unsigned int link_status) 94841e7e056SSarah Sharp { 94941e7e056SSarah Sharp return set_port_feature(hub->hdev, 95041e7e056SSarah Sharp port1 | (link_status << 3), 95141e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 95241e7e056SSarah Sharp } 95341e7e056SSarah Sharp 95441e7e056SSarah Sharp /* 9556d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 95637ebb549SPetr Mladek * time later hub_wq will disconnect() any existing usb_device on the port 9570458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9580458d5b4SAlan Stern */ 9590458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9607d069b7dSAlan Stern { 961d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); 9620458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9630458d5b4SAlan Stern 9640458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9650458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9660458d5b4SAlan Stern * - SRP saves power that way 9670458d5b4SAlan Stern * - ... new call, TBD ... 9680458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 96937ebb549SPetr Mladek * hub_wq reactivates the port later (timer, SRP, etc). 9700458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9710458d5b4SAlan Stern */ 9720458d5b4SAlan Stern 9730458d5b4SAlan Stern set_bit(port1, hub->change_bits); 97432a69589SPetr Mladek kick_hub_wq(hub); 9750458d5b4SAlan Stern } 9760458d5b4SAlan Stern 977253e0572SAlan Stern /** 978253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 979253e0572SAlan Stern * @udev: device to be disabled and removed 980253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 981253e0572SAlan Stern * 98237ebb549SPetr Mladek * After @udev's port has been disabled, hub_wq is notified and it will 983253e0572SAlan Stern * see that the device has been disconnected. When the device is 984253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 985253e0572SAlan Stern * be received and processed normally. 986626f090cSYacine Belkadi * 987626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 988253e0572SAlan Stern */ 989253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 990253e0572SAlan Stern { 991253e0572SAlan Stern struct usb_hub *hub; 992253e0572SAlan Stern struct usb_interface *intf; 99360e3f6e4SEugeniu Rosca int ret; 994253e0572SAlan Stern 995253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 996253e0572SAlan Stern return -EINVAL; 997ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 998253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 999253e0572SAlan Stern 100060e3f6e4SEugeniu Rosca ret = usb_autopm_get_interface(intf); 100160e3f6e4SEugeniu Rosca if (ret < 0) 100260e3f6e4SEugeniu Rosca return ret; 100360e3f6e4SEugeniu Rosca 1004253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 1005253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 1006253e0572SAlan Stern usb_autopm_put_interface(intf); 1007253e0572SAlan Stern return 0; 1008253e0572SAlan Stern } 1009253e0572SAlan Stern 10106ee0b270SAlan Stern enum hub_activation_type { 10118e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 10128520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 10136ee0b270SAlan Stern }; 10145e6effaeSAlan Stern 10158520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 10168520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 10178520f380SAlan Stern 1018f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 10195e6effaeSAlan Stern { 10205e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 1021653a39d1SSarah Sharp struct usb_hcd *hcd; 1022653a39d1SSarah Sharp int ret; 10235e6effaeSAlan Stern int port1; 1024f2835219SAlan Stern int status; 1025948fea37SAlan Stern bool need_debounce_delay = false; 10268520f380SAlan Stern unsigned delay; 10278520f380SAlan Stern 10288520f380SAlan Stern /* Continue a partial initialization */ 1029e50293efSAlan Stern if (type == HUB_INIT2 || type == HUB_INIT3) { 103007d316a2SAlan Stern device_lock(&hdev->dev); 1031e50293efSAlan Stern 1032e50293efSAlan Stern /* Was the hub disconnected while we were waiting? */ 1033ca5cbc8bSAlan Stern if (hub->disconnected) 1034ca5cbc8bSAlan Stern goto disconnected; 10358520f380SAlan Stern if (type == HUB_INIT2) 10368520f380SAlan Stern goto init2; 10378520f380SAlan Stern goto init3; 1038e50293efSAlan Stern } 1039e50293efSAlan Stern kref_get(&hub->kref); 10405e6effaeSAlan Stern 1041a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1042a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1043a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1044a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1045a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1046a45aa3b3SElric Fu * reset procedure. 1047a45aa3b3SElric Fu * 1048a45aa3b3SElric Fu * After a resume, port power should still be on. 1049f2835219SAlan Stern * For any other type of activation, turn it on. 1050f2835219SAlan Stern */ 10518520f380SAlan Stern if (type != HUB_RESUME) { 1052a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 10531afe33a7SOliver Neukum ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 10541afe33a7SOliver Neukum HUB_SET_DEPTH, USB_RT_HUB, 1055a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1056a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 10571afe33a7SOliver Neukum if (ret < 0) 1058a45aa3b3SElric Fu dev_err(hub->intfdev, 1059a45aa3b3SElric Fu "set hub depth failed\n"); 1060a45aa3b3SElric Fu } 10618520f380SAlan Stern 10628520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10638520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10648520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10658520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10668520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10678520f380SAlan Stern * rather than as a module). It adds up. 10688520f380SAlan Stern * 10698520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10708520f380SAlan Stern * because for those activation types the ports have to be 10718520f380SAlan Stern * operational when we return. In theory this could be done 10728520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10738520f380SAlan Stern */ 10748520f380SAlan Stern if (type == HUB_INIT) { 107517a364e2SKris Borer delay = hub_power_on_good_delay(hub); 10767ad3c470SDan Williams 10777ad3c470SDan Williams hub_power_on(hub, false); 107877fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); 107922f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 108022f6a0f0SShaibal Dutta &hub->init_work, 10818520f380SAlan Stern msecs_to_jiffies(delay)); 108261fbeba1SAlan Stern 108361fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10848e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10858e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10868520f380SAlan Stern return; /* Continues at init2: below */ 1087653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1088653a39d1SSarah Sharp /* The internal host controller state for the hub device 1089653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1090653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1091653a39d1SSarah Sharp */ 1092653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1093653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1094653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1095653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1096653a39d1SSarah Sharp if (ret < 0) { 10971ccc417eSJoe Perches dev_err(hub->intfdev, 10981ccc417eSJoe Perches "Host not accepting hub info update\n"); 10991ccc417eSJoe Perches dev_err(hub->intfdev, 11001ccc417eSJoe Perches "LS/FS devices and hubs may not work under this hub\n"); 1101653a39d1SSarah Sharp } 1102653a39d1SSarah Sharp } 1103653a39d1SSarah Sharp hub_power_on(hub, true); 11048520f380SAlan Stern } else { 11058520f380SAlan Stern hub_power_on(hub, true); 11068520f380SAlan Stern } 11078520f380SAlan Stern } 11088520f380SAlan Stern init2: 1109f2835219SAlan Stern 1110d99f6b41SDan Williams /* 111137ebb549SPetr Mladek * Check each port and set hub->change_bits to let hub_wq know 11126ee0b270SAlan Stern * which ports need attention. 11135e6effaeSAlan Stern */ 11145e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1115d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 1116d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 11175e6effaeSAlan Stern u16 portstatus, portchange; 11185e6effaeSAlan Stern 11196ee0b270SAlan Stern portstatus = portchange = 0; 11206ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1121245b2eecSGuenter Roeck if (status) 1122245b2eecSGuenter Roeck goto abort; 1123245b2eecSGuenter Roeck 11246ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 1125d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x change %04x\n", 1126d99f6b41SDan Williams portstatus, portchange); 11275e6effaeSAlan Stern 1128d99f6b41SDan Williams /* 1129d99f6b41SDan Williams * After anything other than HUB_RESUME (i.e., initialization 11306ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 11316ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 11326ee0b270SAlan Stern * and so should ports for which we have no usb_device. 11335e6effaeSAlan Stern */ 11346ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 11356ee0b270SAlan Stern type != HUB_RESUME || 11366ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 11376ee0b270SAlan Stern !udev || 11386ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11399f0a6cd3SAndiry Xu /* 11409f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11419f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1142fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1143fd1ac4cfSDan Williams * power was lost 11449f0a6cd3SAndiry Xu */ 1145fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1146fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1147ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11489f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11499f0a6cd3SAndiry Xu } 11506ee0b270SAlan Stern 11514fdc1790SJan-Marek Glogowski /* Make sure a warm-reset request is handled by port_event */ 11524fdc1790SJan-Marek Glogowski if (type == HUB_RESUME && 11534fdc1790SJan-Marek Glogowski hub_port_warm_reset_required(hub, port1, portstatus)) 11544fdc1790SJan-Marek Glogowski set_bit(port1, hub->event_bits); 11554fdc1790SJan-Marek Glogowski 1156e8610894SMathias Nyman /* 1157e8610894SMathias Nyman * Add debounce if USB3 link is in polling/link training state. 1158e8610894SMathias Nyman * Link will automatically transition to Enabled state after 1159e8610894SMathias Nyman * link training completes. 1160e8610894SMathias Nyman */ 1161e8610894SMathias Nyman if (hub_is_superspeed(hdev) && 1162e8610894SMathias Nyman ((portstatus & USB_PORT_STAT_LINK_STATE) == 1163e8610894SMathias Nyman USB_SS_PORT_LS_POLLING)) 1164e8610894SMathias Nyman need_debounce_delay = true; 1165e8610894SMathias Nyman 1166948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1167948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1168948fea37SAlan Stern need_debounce_delay = true; 1169ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1170948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1171948fea37SAlan Stern } 1172948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1173948fea37SAlan Stern need_debounce_delay = true; 1174ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1175948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1176948fea37SAlan Stern } 1177e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1178e92aee33SJulius Werner need_debounce_delay = true; 1179e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1180e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1181e92aee33SJulius Werner } 118279c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 118379c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 118479c3dd81SDon Zickus need_debounce_delay = true; 1185ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 118679c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 118779c3dd81SDon Zickus } 1188253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1189253e0572SAlan Stern * physical disconnect or the connect status changes. 1190253e0572SAlan Stern */ 1191253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1192253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1193253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1194253e0572SAlan Stern 11956ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 119637ebb549SPetr Mladek /* Tell hub_wq to disconnect the device or 1197249a32b7SBin Liu * check for a new connection or over current condition. 1198249a32b7SBin Liu * Based on USB2.0 Spec Section 11.12.5, 1199249a32b7SBin Liu * C_PORT_OVER_CURRENT could be set while 1200249a32b7SBin Liu * PORT_OVER_CURRENT is not. So check for any of them. 12016ee0b270SAlan Stern */ 120208d1dec6SShen Guang if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || 12039c06ac4cSKeiya Nobuta (portchange & USB_PORT_STAT_C_CONNECTION) || 1204249a32b7SBin Liu (portstatus & USB_PORT_STAT_OVERCURRENT) || 1205249a32b7SBin Liu (portchange & USB_PORT_STAT_C_OVERCURRENT)) 12066ee0b270SAlan Stern set_bit(port1, hub->change_bits); 12076ee0b270SAlan Stern 12086ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 120972937e1eSSarah Sharp bool port_resumed = (portstatus & 121072937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 121172937e1eSSarah Sharp USB_SS_PORT_LS_U0; 12126ee0b270SAlan Stern /* The power session apparently survived the resume. 12136ee0b270SAlan Stern * If there was an overcurrent or suspend change 121437ebb549SPetr Mladek * (i.e., remote wakeup request), have hub_wq 121572937e1eSSarah Sharp * take care of it. Look at the port link state 121672937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 121772937e1eSSarah Sharp * change bit, and they don't set the port link change 121872937e1eSSarah Sharp * bit on device-initiated resume. 12196ee0b270SAlan Stern */ 122072937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 122172937e1eSSarah Sharp port_resumed)) 12226ee0b270SAlan Stern set_bit(port1, hub->change_bits); 12236ee0b270SAlan Stern 12246ee0b270SAlan Stern } else if (udev->persist_enabled) { 12256ee0b270SAlan Stern #ifdef CONFIG_PM 12265e6effaeSAlan Stern udev->reset_resume = 1; 12276ee0b270SAlan Stern #endif 12289f952e26SAlan Stern /* Don't set the change_bits when the device 12299f952e26SAlan Stern * was powered off. 12309f952e26SAlan Stern */ 12319f952e26SAlan Stern if (test_bit(port1, hub->power_bits)) 12329f952e26SAlan Stern set_bit(port1, hub->change_bits); 12338808f00cSAlan Stern 12346ee0b270SAlan Stern } else { 123537ebb549SPetr Mladek /* The power session is gone; tell hub_wq */ 12366ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 12376ee0b270SAlan Stern set_bit(port1, hub->change_bits); 12385e6effaeSAlan Stern } 12395e6effaeSAlan Stern } 12405e6effaeSAlan Stern 1241948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1242948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 124337ebb549SPetr Mladek * ports all at once right now, instead of letting hub_wq do them 1244948fea37SAlan Stern * one at a time later on. 1245948fea37SAlan Stern * 124637ebb549SPetr Mladek * If any port-status changes do occur during this delay, hub_wq 1247948fea37SAlan Stern * will see them later and handle them normally. 1248948fea37SAlan Stern */ 12498520f380SAlan Stern if (need_debounce_delay) { 12508520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1251f2835219SAlan Stern 12528520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 12538520f380SAlan Stern if (type == HUB_INIT2) { 125477fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); 125522f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 125622f6a0f0SShaibal Dutta &hub->init_work, 12578520f380SAlan Stern msecs_to_jiffies(delay)); 125807d316a2SAlan Stern device_unlock(&hdev->dev); 12598520f380SAlan Stern return; /* Continues at init3: below */ 12608520f380SAlan Stern } else { 12618520f380SAlan Stern msleep(delay); 12628520f380SAlan Stern } 12638520f380SAlan Stern } 12648520f380SAlan Stern init3: 1265f2835219SAlan Stern hub->quiescing = 0; 1266f2835219SAlan Stern 1267f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1268f2835219SAlan Stern if (status < 0) 1269f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1270f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 127122f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 127222f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 1273f2835219SAlan Stern 1274f2835219SAlan Stern /* Scan all ports that need attention */ 127532a69589SPetr Mladek kick_hub_wq(hub); 1276245b2eecSGuenter Roeck abort: 1277ca5cbc8bSAlan Stern if (type == HUB_INIT2 || type == HUB_INIT3) { 12788e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 1279ca5cbc8bSAlan Stern disconnected: 12808e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 128107d316a2SAlan Stern device_unlock(&hdev->dev); 1282ca5cbc8bSAlan Stern } 1283e50293efSAlan Stern 1284e50293efSAlan Stern kref_put(&hub->kref, hub_release); 12855e6effaeSAlan Stern } 12865e6effaeSAlan Stern 12878520f380SAlan Stern /* Implement the continuations for the delays above */ 12888520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12898520f380SAlan Stern { 12908520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12918520f380SAlan Stern 12928520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12938520f380SAlan Stern } 12948520f380SAlan Stern 12958520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12968520f380SAlan Stern { 12978520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12988520f380SAlan Stern 12998520f380SAlan Stern hub_activate(hub, HUB_INIT3); 13008520f380SAlan Stern } 13018520f380SAlan Stern 13024330354fSAlan Stern enum hub_quiescing_type { 13034330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 13044330354fSAlan Stern }; 13054330354fSAlan Stern 13064330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 13074330354fSAlan Stern { 13084330354fSAlan Stern struct usb_device *hdev = hub->hdev; 13098eb58994SNicolas Saenz Julienne unsigned long flags; 13104330354fSAlan Stern int i; 13114330354fSAlan Stern 131237ebb549SPetr Mladek /* hub_wq and related activity won't re-trigger */ 13138eb58994SNicolas Saenz Julienne spin_lock_irqsave(&hub->irq_urb_lock, flags); 13144330354fSAlan Stern hub->quiescing = 1; 13158eb58994SNicolas Saenz Julienne spin_unlock_irqrestore(&hub->irq_urb_lock, flags); 13164330354fSAlan Stern 13174330354fSAlan Stern if (type != HUB_SUSPEND) { 13184330354fSAlan Stern /* Disconnect all the children */ 13194330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1320ff823c79SLan Tianyu if (hub->ports[i]->child) 1321ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 13224330354fSAlan Stern } 13234330354fSAlan Stern } 13244330354fSAlan Stern 132537ebb549SPetr Mladek /* Stop hub_wq and related activity */ 13268eb58994SNicolas Saenz Julienne del_timer_sync(&hub->irq_urb_retry); 13274330354fSAlan Stern usb_kill_urb(hub->urb); 13284330354fSAlan Stern if (hub->has_indicators) 13294330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 13304330354fSAlan Stern if (hub->tt.hub) 1331036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 13324330354fSAlan Stern } 13334330354fSAlan Stern 1334600856c2SAlan Stern static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) 1335600856c2SAlan Stern { 1336600856c2SAlan Stern int i; 1337600856c2SAlan Stern 1338600856c2SAlan Stern for (i = 0; i < hub->hdev->maxchild; ++i) 1339600856c2SAlan Stern pm_runtime_barrier(&hub->ports[i]->dev); 1340600856c2SAlan Stern } 1341600856c2SAlan Stern 13423eb14915SAlan Stern /* caller has locked the hub device */ 13433eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 13443eb14915SAlan Stern { 13453eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 13463eb14915SAlan Stern 13474330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1348600856c2SAlan Stern hub->in_reset = 1; 1349600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1350f07600cfSAlan Stern return 0; 13517d069b7dSAlan Stern } 13527d069b7dSAlan Stern 13537d069b7dSAlan Stern /* caller has locked the hub device */ 1354f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 13557d069b7dSAlan Stern { 13567de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 13577de18d8bSAlan Stern 1358600856c2SAlan Stern hub->in_reset = 0; 1359600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1360f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1361f07600cfSAlan Stern return 0; 13627d069b7dSAlan Stern } 13637d069b7dSAlan Stern 13641da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 13651da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 13661da177e4SLinus Torvalds { 1367b356b7c7SSarah Sharp struct usb_hcd *hcd; 13681da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 13691da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 13701da177e4SLinus Torvalds u16 hubstatus, hubchange; 137174ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 13721da177e4SLinus Torvalds unsigned int pipe; 1373fa2a9566SLan Tianyu int maxp, ret, i; 13747cbe5dcaSAlan Stern char *message = "out of memory"; 1375430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1376430ee58eSSebastian Andrzej Siewior unsigned full_load; 1377d8521afeSDan Williams unsigned maxchild; 13781da177e4SLinus Torvalds 1379d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13801da177e4SLinus Torvalds if (!hub->buffer) { 13811da177e4SLinus Torvalds ret = -ENOMEM; 13821da177e4SLinus Torvalds goto fail; 13831da177e4SLinus Torvalds } 13841da177e4SLinus Torvalds 13851da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13861da177e4SLinus Torvalds if (!hub->status) { 13871da177e4SLinus Torvalds ret = -ENOMEM; 13881da177e4SLinus Torvalds goto fail; 13891da177e4SLinus Torvalds } 1390db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13911da177e4SLinus Torvalds 1392bec444cdSJohan Hovold hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13931da177e4SLinus Torvalds if (!hub->descriptor) { 13941da177e4SLinus Torvalds ret = -ENOMEM; 13951da177e4SLinus Torvalds goto fail; 13961da177e4SLinus Torvalds } 13971da177e4SLinus Torvalds 13981da177e4SLinus Torvalds /* Request the entire hub descriptor. 13991da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 14002c25a2c8SJohan Hovold * but a (non-SS) hub can/will return fewer bytes here. 14011da177e4SLinus Torvalds */ 1402dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 14031da177e4SLinus Torvalds if (ret < 0) { 14041da177e4SLinus Torvalds message = "can't read hub descriptor"; 14051da177e4SLinus Torvalds goto fail; 140693491cedSJohan Hovold } 140793491cedSJohan Hovold 140893491cedSJohan Hovold maxchild = USB_MAXCHILDREN; 140993491cedSJohan Hovold if (hub_is_superspeed(hdev)) 141093491cedSJohan Hovold maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS); 141193491cedSJohan Hovold 141293491cedSJohan Hovold if (hub->descriptor->bNbrPorts > maxchild) { 14131da177e4SLinus Torvalds message = "hub has too many ports!"; 14141da177e4SLinus Torvalds ret = -ENODEV; 14151da177e4SLinus Torvalds goto fail; 1416769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1417769d7368SDavid Linares message = "hub doesn't have any ports!"; 1418769d7368SDavid Linares ret = -ENODEV; 1419769d7368SDavid Linares goto fail; 14201da177e4SLinus Torvalds } 14211da177e4SLinus Torvalds 1422886ee36eSFelipe Balbi /* 1423886ee36eSFelipe Balbi * Accumulate wHubDelay + 40ns for every hub in the tree of devices. 1424886ee36eSFelipe Balbi * The resulting value will be used for SetIsochDelay() request. 1425886ee36eSFelipe Balbi */ 1426886ee36eSFelipe Balbi if (hub_is_superspeed(hdev) || hub_is_superspeedplus(hdev)) { 1427886ee36eSFelipe Balbi u32 delay = __le16_to_cpu(hub->descriptor->u.ss.wHubDelay); 1428886ee36eSFelipe Balbi 1429886ee36eSFelipe Balbi if (hdev->parent) 1430886ee36eSFelipe Balbi delay += hdev->parent->hub_delay; 1431886ee36eSFelipe Balbi 1432886ee36eSFelipe Balbi delay += USB_TP_TRANSMISSION_DELAY; 1433886ee36eSFelipe Balbi hdev->hub_delay = min_t(u32, delay, USB_TP_TRANSMISSION_DELAY_MAX); 1434886ee36eSFelipe Balbi } 1435886ee36eSFelipe Balbi 1436d8521afeSDan Williams maxchild = hub->descriptor->bNbrPorts; 1437d8521afeSDan Williams dev_info(hub_dev, "%d port%s detected\n", maxchild, 1438d8521afeSDan Williams (maxchild == 1) ? "" : "s"); 14391da177e4SLinus Torvalds 14406396bb22SKees Cook hub->ports = kcalloc(maxchild, sizeof(struct usb_port *), GFP_KERNEL); 1441ff823c79SLan Tianyu if (!hub->ports) { 14427cbe5dcaSAlan Stern ret = -ENOMEM; 14437cbe5dcaSAlan Stern goto fail; 14447cbe5dcaSAlan Stern } 14457cbe5dcaSAlan Stern 144674ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1447430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1448430ee58eSSebastian Andrzej Siewior unit_load = 150; 1449430ee58eSSebastian Andrzej Siewior full_load = 900; 1450430ee58eSSebastian Andrzej Siewior } else { 1451430ee58eSSebastian Andrzej Siewior unit_load = 100; 1452430ee58eSSebastian Andrzej Siewior full_load = 500; 1453430ee58eSSebastian Andrzej Siewior } 14541da177e4SLinus Torvalds 1455dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1456dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1457dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 14581da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 14591da177e4SLinus Torvalds 1460d8521afeSDan Williams for (i = 0; i < maxchild; i++) 1461dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 14621da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 14631da177e4SLinus Torvalds ? 'F' : 'R'; 1464d8521afeSDan Williams portstr[maxchild] = 0; 14651da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 14661da177e4SLinus Torvalds } else 14671da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 14681da177e4SLinus Torvalds 146974ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 14707bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 14711da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 14721da177e4SLinus Torvalds break; 14737bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 14741da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 14751da177e4SLinus Torvalds break; 14767bf01185SAman Deep case HUB_CHAR_NO_LPSM: 14777bf01185SAman Deep case HUB_CHAR_LPSM: 14781da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 14791da177e4SLinus Torvalds break; 14801da177e4SLinus Torvalds } 14811da177e4SLinus Torvalds 148274ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 14837bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 14841da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 14851da177e4SLinus Torvalds break; 14867bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 14871da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 14881da177e4SLinus Torvalds break; 14897bf01185SAman Deep case HUB_CHAR_NO_OCPM: 14907bf01185SAman Deep case HUB_CHAR_OCPM: 14911da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 14921da177e4SLinus Torvalds break; 14931da177e4SLinus Torvalds } 14941da177e4SLinus Torvalds 14951da177e4SLinus Torvalds spin_lock_init(&hub->tt.lock); 14961da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->tt.clear_list); 1497cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14981da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14997bf01185SAman Deep case USB_HUB_PR_FS: 15001da177e4SLinus Torvalds break; 15017bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 15021da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 15031da177e4SLinus Torvalds hub->tt.hub = hdev; 15041da177e4SLinus Torvalds break; 15057bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 15061da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 15071da177e4SLinus Torvalds if (ret == 0) { 15081da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 15091da177e4SLinus Torvalds hub->tt.multi = 1; 15101da177e4SLinus Torvalds } else 15111da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 15121da177e4SLinus Torvalds ret); 15131da177e4SLinus Torvalds hub->tt.hub = hdev; 15141da177e4SLinus Torvalds break; 15157bf01185SAman Deep case USB_HUB_PR_SS: 1516d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1517d2e9b4d6SSarah Sharp break; 15181da177e4SLinus Torvalds default: 15191da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 15201da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 15211da177e4SLinus Torvalds break; 15221da177e4SLinus Torvalds } 15231da177e4SLinus Torvalds 1524e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 152574ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1526e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1527e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1528e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1529e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1530e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1531e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1532e09711aeSdavid-b@pacbell.net } 15331da177e4SLinus Torvalds break; 1534e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1535e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1536e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1537e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1538e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 15391da177e4SLinus Torvalds break; 1540e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1541e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1542e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1543e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1544e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 15451da177e4SLinus Torvalds break; 1546e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1547e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1548e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1549e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1550e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 15511da177e4SLinus Torvalds break; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 155574ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 15561da177e4SLinus Torvalds hub->has_indicators = 1; 15571da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 15581da177e4SLinus Torvalds } 15591da177e4SLinus Torvalds 15601da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 15611da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 15621da177e4SLinus Torvalds 15631da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 15641da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 15651da177e4SLinus Torvalds */ 1566d9e1e148SFelipe Balbi ret = usb_get_std_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 156715b7336eSAlan Stern if (ret) { 15681da177e4SLinus Torvalds message = "can't get hub status"; 15691da177e4SLinus Torvalds goto fail; 15701da177e4SLinus Torvalds } 1571430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 15727d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1573430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1574430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1575430ee58eSSebastian Andrzej Siewior else 1576d8521afeSDan Williams hdev->bus_mA = full_load * maxchild; 1577430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1578430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 157955c52718SAlan Stern else { 158055c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 158155c52718SAlan Stern hub->limited_power = 1; 158255c52718SAlan Stern } 15837d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 158455c52718SAlan Stern int remaining = hdev->bus_mA - 158555c52718SAlan Stern hub->descriptor->bHubContrCurrent; 15861da177e4SLinus Torvalds 1587430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1588430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1589430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1590430ee58eSSebastian Andrzej Siewior 1591d8521afeSDan Williams if (remaining < maxchild * unit_load) 159255c52718SAlan Stern dev_warn(hub_dev, 159355c52718SAlan Stern "insufficient power available " 159455c52718SAlan Stern "to use all downstream ports\n"); 1595430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1596430ee58eSSebastian Andrzej Siewior 159755c52718SAlan Stern } else { /* Self-powered external hub */ 159855c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 159955c52718SAlan Stern * provide less current per port? */ 1600430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 160155c52718SAlan Stern } 1602430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 160355c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 160455c52718SAlan Stern hub->mA_per_port); 16051da177e4SLinus Torvalds 16061da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 16071da177e4SLinus Torvalds if (ret < 0) { 16081da177e4SLinus Torvalds message = "can't get hub status"; 16091da177e4SLinus Torvalds goto fail; 16101da177e4SLinus Torvalds } 16111da177e4SLinus Torvalds 16121da177e4SLinus Torvalds /* local power status reports aren't always correct */ 16131da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 16141da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 16151da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 16161da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 16171da177e4SLinus Torvalds 161874ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 16191da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 16201da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 16211da177e4SLinus Torvalds 162288fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 162388fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 162488fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 162588fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 162688fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 162788fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 16281da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 16291da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 16301da177e4SLinus Torvalds 16311da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 16321da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 16331da177e4SLinus Torvalds 16341da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 16351da177e4SLinus Torvalds if (!hub->urb) { 16361da177e4SLinus Torvalds ret = -ENOMEM; 16371da177e4SLinus Torvalds goto fail; 16381da177e4SLinus Torvalds } 16391da177e4SLinus Torvalds 16401da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 16411da177e4SLinus Torvalds hub, endpoint->bInterval); 16421da177e4SLinus Torvalds 16431da177e4SLinus Torvalds /* maybe cycle the hub leds */ 16441da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 16451da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 16461da177e4SLinus Torvalds 1647d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1648d8521afeSDan Williams for (i = 0; i < maxchild; i++) { 1649e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1650e58547ebSKrzysztof Mazur if (ret < 0) { 1651fa2a9566SLan Tianyu dev_err(hub->intfdev, 1652fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1653d8521afeSDan Williams break; 1654d8521afeSDan Williams } 1655d8521afeSDan Williams } 1656e58547ebSKrzysztof Mazur hdev->maxchild = i; 1657e3d10505SDan Williams for (i = 0; i < hdev->maxchild; i++) { 1658e3d10505SDan Williams struct usb_port *port_dev = hub->ports[i]; 1659e3d10505SDan Williams 1660e3d10505SDan Williams pm_runtime_put(&port_dev->dev); 1661e3d10505SDan Williams } 1662e3d10505SDan Williams 1663d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1664d8521afeSDan Williams if (ret < 0) 1665d8521afeSDan Williams goto fail; 1666fa2a9566SLan Tianyu 166737ebb549SPetr Mladek /* Update the HCD's internal representation of this hub before hub_wq 1668e3d95580SDan Williams * starts getting port status changes for devices under the hub. 1669e3d95580SDan Williams */ 1670e3d95580SDan Williams if (hcd->driver->update_hub_device) { 1671e3d95580SDan Williams ret = hcd->driver->update_hub_device(hcd, hdev, 1672e3d95580SDan Williams &hub->tt, GFP_KERNEL); 1673e3d95580SDan Williams if (ret < 0) { 1674e3d95580SDan Williams message = "can't update HCD hub info"; 1675e3d95580SDan Williams goto fail; 1676e3d95580SDan Williams } 1677e3d95580SDan Williams } 1678e3d95580SDan Williams 1679d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1680d2123fd9SLan Tianyu 1681f2835219SAlan Stern hub_activate(hub, HUB_INIT); 16821da177e4SLinus Torvalds return 0; 16831da177e4SLinus Torvalds 16841da177e4SLinus Torvalds fail: 16851da177e4SLinus Torvalds dev_err(hub_dev, "config failed, %s (err %d)\n", 16861da177e4SLinus Torvalds message, ret); 16871da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 16881da177e4SLinus Torvalds return ret; 16891da177e4SLinus Torvalds } 16901da177e4SLinus Torvalds 1691e8054854SAlan Stern static void hub_release(struct kref *kref) 1692e8054854SAlan Stern { 1693e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1694e8054854SAlan Stern 16955d14f323SPetr Mladek usb_put_dev(hub->hdev); 1696e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1697e8054854SAlan Stern kfree(hub); 1698e8054854SAlan Stern } 1699e8054854SAlan Stern 17001da177e4SLinus Torvalds static unsigned highspeed_hubs; 17011da177e4SLinus Torvalds 17021da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 17031da177e4SLinus Torvalds { 17041da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1705fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1706543d7784SAlan Stern int port1; 1707fa2a9566SLan Tianyu 170832a69589SPetr Mladek /* 170932a69589SPetr Mladek * Stop adding new hub events. We do not want to block here and thus 171032a69589SPetr Mladek * will not try to remove any pending work item. 171132a69589SPetr Mladek */ 1712e8054854SAlan Stern hub->disconnected = 1; 17131da177e4SLinus Torvalds 17147de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 17157de18d8bSAlan Stern hub->error = 0; 17164330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 17177de18d8bSAlan Stern 1718d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1719d8521afeSDan Williams 1720543d7784SAlan Stern /* Avoid races with recursively_mark_NOTATTACHED() */ 1721543d7784SAlan Stern spin_lock_irq(&device_state_lock); 1722543d7784SAlan Stern port1 = hdev->maxchild; 1723543d7784SAlan Stern hdev->maxchild = 0; 17248b28c752SAlan Stern usb_set_intfdata(intf, NULL); 1725543d7784SAlan Stern spin_unlock_irq(&device_state_lock); 17261f2235b8SAlexander Shishkin 1727543d7784SAlan Stern for (; port1 > 0; --port1) 1728543d7784SAlan Stern usb_hub_remove_port_device(hub, port1); 17291da177e4SLinus Torvalds 1730d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1731d8521afeSDan Williams 1732e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 17331da177e4SLinus Torvalds highspeed_hubs--; 17341da177e4SLinus Torvalds 17351da177e4SLinus Torvalds usb_free_urb(hub->urb); 1736fa2a9566SLan Tianyu kfree(hub->ports); 17371da177e4SLinus Torvalds kfree(hub->descriptor); 17381da177e4SLinus Torvalds kfree(hub->status); 1739d697cddaSAlan Stern kfree(hub->buffer); 17401da177e4SLinus Torvalds 1741971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 17421208f9e1SHardik Gajjar 17431208f9e1SHardik Gajjar if (hub->quirk_disable_autosuspend) 17441208f9e1SHardik Gajjar usb_autopm_put_interface(intf); 17451208f9e1SHardik Gajjar 1746e8054854SAlan Stern kref_put(&hub->kref, hub_release); 17471da177e4SLinus Torvalds } 17481da177e4SLinus Torvalds 1749c94dc34fSEugene Korenevsky static bool hub_descriptor_is_sane(struct usb_host_interface *desc) 1750c94dc34fSEugene Korenevsky { 1751c94dc34fSEugene Korenevsky /* Some hubs have a subclass of 1, which AFAICT according to the */ 1752c94dc34fSEugene Korenevsky /* specs is not defined, but it works */ 1753c94dc34fSEugene Korenevsky if (desc->desc.bInterfaceSubClass != 0 && 1754c94dc34fSEugene Korenevsky desc->desc.bInterfaceSubClass != 1) 1755c94dc34fSEugene Korenevsky return false; 1756c94dc34fSEugene Korenevsky 1757c94dc34fSEugene Korenevsky /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 1758c94dc34fSEugene Korenevsky if (desc->desc.bNumEndpoints != 1) 1759c94dc34fSEugene Korenevsky return false; 1760c94dc34fSEugene Korenevsky 1761c94dc34fSEugene Korenevsky /* If the first endpoint is not interrupt IN, we'd better punt! */ 1762c94dc34fSEugene Korenevsky if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) 1763c94dc34fSEugene Korenevsky return false; 1764c94dc34fSEugene Korenevsky 1765c94dc34fSEugene Korenevsky return true; 1766c94dc34fSEugene Korenevsky } 1767c94dc34fSEugene Korenevsky 17681da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 17691da177e4SLinus Torvalds { 17701da177e4SLinus Torvalds struct usb_host_interface *desc; 17711da177e4SLinus Torvalds struct usb_device *hdev; 17721da177e4SLinus Torvalds struct usb_hub *hub; 17731da177e4SLinus Torvalds 17741da177e4SLinus Torvalds desc = intf->cur_altsetting; 17751da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 17761da177e4SLinus Torvalds 1777596d789aSMing Lei /* 1778596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1779596d789aSMing Lei * based on the below considerations: 1780596d789aSMing Lei * 1781596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1782596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1783596d789aSMing Lei * event, and the submitted status URB is just to check future 1784596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1785596d789aSMing Lei * 1786596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1787596d789aSMing Lei * below very rare devices when they are plugged into hub 1788596d789aSMing Lei * first time: 1789596d789aSMing Lei * 1790596d789aSMing Lei * devices having trouble initializing, and disconnect 1791596d789aSMing Lei * themselves from the bus and then reconnect a second 1792596d789aSMing Lei * or so later 1793596d789aSMing Lei * 1794596d789aSMing Lei * devices just for downloading firmware, and disconnects 1795596d789aSMing Lei * themselves after completing it 1796596d789aSMing Lei * 1797596d789aSMing Lei * For these quite rare devices, their drivers may change the 1798596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1799596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1800596d789aSMing Lei * does care it. 1801596d789aSMing Lei * 1802596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1803596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1804596d789aSMing Lei * infrequent to worry about. 1805596d789aSMing Lei * 1806596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1807596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1808596d789aSMing Lei * of USB bus. 1809bdd405d2SRoger Quadros * 1810bdd405d2SRoger Quadros * - If user has indicated to prevent autosuspend by passing 1811bdd405d2SRoger Quadros * usbcore.autosuspend = -1 then keep autosuspend disabled. 1812596d789aSMing Lei */ 1813ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 1814bdd405d2SRoger Quadros if (hdev->dev.power.autosuspend_delay >= 0) 1815596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1816a9ef803dSGreg Kroah-Hartman #endif 1817596d789aSMing Lei 18188ef42dddSAlan Stern /* 18198ef42dddSAlan Stern * Hubs have proper suspend/resume support, except for root hubs 18208ef42dddSAlan Stern * where the controller driver doesn't have bus_suspend and 18218ef42dddSAlan Stern * bus_resume methods. 18228ef42dddSAlan Stern */ 18238ef42dddSAlan Stern if (hdev->parent) { /* normal device */ 1824088f7fecSAlan Stern usb_enable_autosuspend(hdev); 18258ef42dddSAlan Stern } else { /* root hub */ 18268ef42dddSAlan Stern const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; 18278ef42dddSAlan Stern 18288ef42dddSAlan Stern if (drv->bus_suspend && drv->bus_resume) 18298ef42dddSAlan Stern usb_enable_autosuspend(hdev); 18308ef42dddSAlan Stern } 1831088f7fecSAlan Stern 183238f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1833b9cef6c3SWu Fengguang dev_err(&intf->dev, 1834b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 183538f3ad5eSFelipe Balbi return -E2BIG; 183638f3ad5eSFelipe Balbi } 183738f3ad5eSFelipe Balbi 18389af54301SGreg Kroah-Hartman #ifdef CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB 183989ccbdc9SDavid Brownell if (hdev->parent) { 184089ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 184189ccbdc9SDavid Brownell return -ENODEV; 184289ccbdc9SDavid Brownell } 184389ccbdc9SDavid Brownell #endif 184489ccbdc9SDavid Brownell 1845c94dc34fSEugene Korenevsky if (!hub_descriptor_is_sane(desc)) { 18461da177e4SLinus Torvalds dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); 18471da177e4SLinus Torvalds return -EIO; 18481da177e4SLinus Torvalds } 18491da177e4SLinus Torvalds 18501da177e4SLinus Torvalds /* We found a hub */ 18511da177e4SLinus Torvalds dev_info(&intf->dev, "USB hub found\n"); 18521da177e4SLinus Torvalds 18530a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 1854b74e7062SWolfram Sang if (!hub) 18551da177e4SLinus Torvalds return -ENOMEM; 18561da177e4SLinus Torvalds 1857e8054854SAlan Stern kref_init(&hub->kref); 18581da177e4SLinus Torvalds hub->intfdev = &intf->dev; 18591da177e4SLinus Torvalds hub->hdev = hdev; 1860c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 18618520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 186232a69589SPetr Mladek INIT_WORK(&hub->events, hub_event); 18638eb58994SNicolas Saenz Julienne spin_lock_init(&hub->irq_urb_lock); 18648eb58994SNicolas Saenz Julienne timer_setup(&hub->irq_urb_retry, hub_retry_irq_urb, 0); 1865e8054854SAlan Stern usb_get_intf(intf); 18665d14f323SPetr Mladek usb_get_dev(hdev); 18671da177e4SLinus Torvalds 18681da177e4SLinus Torvalds usb_set_intfdata(intf, hub); 186940f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1870971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 18711da177e4SLinus Torvalds 18721da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 18731da177e4SLinus Torvalds highspeed_hubs++; 18741da177e4SLinus Torvalds 1875e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1876e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1877e6f30deaSMing Lei 18781208f9e1SHardik Gajjar if (id->driver_info & HUB_QUIRK_DISABLE_AUTOSUSPEND) { 18791208f9e1SHardik Gajjar hub->quirk_disable_autosuspend = 1; 188063d6d7edSEugeniu Rosca usb_autopm_get_interface_no_resume(intf); 18811208f9e1SHardik Gajjar } 18821208f9e1SHardik Gajjar 1883c94dc34fSEugene Korenevsky if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) 18841da177e4SLinus Torvalds return 0; 18851da177e4SLinus Torvalds 18861da177e4SLinus Torvalds hub_disconnect(intf); 18871da177e4SLinus Torvalds return -ENODEV; 18881da177e4SLinus Torvalds } 18891da177e4SLinus Torvalds 18901da177e4SLinus Torvalds static int 18911da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 18921da177e4SLinus Torvalds { 18931da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 1894ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18951da177e4SLinus Torvalds 18961da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 18971da177e4SLinus Torvalds switch (code) { 18981da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 18991da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 19001da177e4SLinus Torvalds int i; 19011da177e4SLinus Torvalds 19021da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 19031da177e4SLinus Torvalds if (hdev->devnum <= 0) 19041da177e4SLinus Torvalds info->nports = 0; 19051da177e4SLinus Torvalds else { 19061da177e4SLinus Torvalds info->nports = hdev->maxchild; 19071da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1908ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 19091da177e4SLinus Torvalds info->port[i] = 0; 19101da177e4SLinus Torvalds else 19111da177e4SLinus Torvalds info->port[i] = 1912ff823c79SLan Tianyu hub->ports[i]->child->devnum; 19131da177e4SLinus Torvalds } 19141da177e4SLinus Torvalds } 19151da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 19161da177e4SLinus Torvalds 19171da177e4SLinus Torvalds return info->nports + 1; 19181da177e4SLinus Torvalds } 19191da177e4SLinus Torvalds 19201da177e4SLinus Torvalds default: 19211da177e4SLinus Torvalds return -ENOSYS; 19221da177e4SLinus Torvalds } 19231da177e4SLinus Torvalds } 19241da177e4SLinus Torvalds 19257cbe5dcaSAlan Stern /* 19267cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 19277cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 19287cbe5dcaSAlan Stern */ 19297cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 19309b6f0c4bSValentina Manea struct usb_dev_state ***ppowner) 19317cbe5dcaSAlan Stern { 193241341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 193341341261SMathias Nyman 19347cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 19357cbe5dcaSAlan Stern return -ENODEV; 19367cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 19377cbe5dcaSAlan Stern return -EINVAL; 19387cbe5dcaSAlan Stern 193941341261SMathias Nyman /* Devices not managed by the hub driver 19407cbe5dcaSAlan Stern * will always have maxchild equal to 0. 19417cbe5dcaSAlan Stern */ 194241341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 19437cbe5dcaSAlan Stern return 0; 19447cbe5dcaSAlan Stern } 19457cbe5dcaSAlan Stern 19467cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1947336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 19489b6f0c4bSValentina Manea struct usb_dev_state *owner) 19497cbe5dcaSAlan Stern { 19507cbe5dcaSAlan Stern int rc; 19519b6f0c4bSValentina Manea struct usb_dev_state **powner; 19527cbe5dcaSAlan Stern 19537cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 19547cbe5dcaSAlan Stern if (rc) 19557cbe5dcaSAlan Stern return rc; 19567cbe5dcaSAlan Stern if (*powner) 19577cbe5dcaSAlan Stern return -EBUSY; 19587cbe5dcaSAlan Stern *powner = owner; 19597cbe5dcaSAlan Stern return rc; 19607cbe5dcaSAlan Stern } 19616080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_claim_port); 19627cbe5dcaSAlan Stern 1963336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 19649b6f0c4bSValentina Manea struct usb_dev_state *owner) 19657cbe5dcaSAlan Stern { 19667cbe5dcaSAlan Stern int rc; 19679b6f0c4bSValentina Manea struct usb_dev_state **powner; 19687cbe5dcaSAlan Stern 19697cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 19707cbe5dcaSAlan Stern if (rc) 19717cbe5dcaSAlan Stern return rc; 19727cbe5dcaSAlan Stern if (*powner != owner) 19737cbe5dcaSAlan Stern return -ENOENT; 19747cbe5dcaSAlan Stern *powner = NULL; 19757cbe5dcaSAlan Stern return rc; 19767cbe5dcaSAlan Stern } 19776080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_release_port); 19787cbe5dcaSAlan Stern 19799b6f0c4bSValentina Manea void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) 19807cbe5dcaSAlan Stern { 1981ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 19827cbe5dcaSAlan Stern int n; 19837cbe5dcaSAlan Stern 1984fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1985fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1986fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 19877cbe5dcaSAlan Stern } 1988fa2a9566SLan Tianyu 19897cbe5dcaSAlan Stern } 19907cbe5dcaSAlan Stern 19917cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 19927cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 19937cbe5dcaSAlan Stern { 19947cbe5dcaSAlan Stern struct usb_hub *hub; 19957cbe5dcaSAlan Stern 19967cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 19977cbe5dcaSAlan Stern return false; 1998ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1999fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 20007cbe5dcaSAlan Stern } 20017cbe5dcaSAlan Stern 20021da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 20031da177e4SLinus Torvalds { 2004ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20051da177e4SLinus Torvalds int i; 20061da177e4SLinus Torvalds 20071da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 2008ff823c79SLan Tianyu if (hub->ports[i]->child) 2009ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 20101da177e4SLinus Torvalds } 20119bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 201215123006SSarah Sharp udev->active_duration -= jiffies; 20131da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 20141da177e4SLinus Torvalds } 20151da177e4SLinus Torvalds 20161da177e4SLinus Torvalds /** 20171da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 20181da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 20191da177e4SLinus Torvalds * @new_state: new state value to be stored 20201da177e4SLinus Torvalds * 20211da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 20221da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 20231da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 20241da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 20251da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 20261da177e4SLinus Torvalds * all changes to any device's state must be protected by the 20271da177e4SLinus Torvalds * device_state_lock spinlock. 20281da177e4SLinus Torvalds * 20291da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 20301da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 20311da177e4SLinus Torvalds * 20321da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 20331da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 20341da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 20351da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 20361da177e4SLinus Torvalds */ 20371da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 20381da177e4SLinus Torvalds enum usb_device_state new_state) 20391da177e4SLinus Torvalds { 20401da177e4SLinus Torvalds unsigned long flags; 20414681b171SRafael J. Wysocki int wakeup = -1; 20421da177e4SLinus Torvalds 20431da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 20441da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 20451da177e4SLinus Torvalds ; /* do nothing */ 2046b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 2047fb669cc0SDavid Brownell 2048fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 2049fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 2050fb669cc0SDavid Brownell */ 2051fb669cc0SDavid Brownell if (udev->parent) { 2052645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 2053645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 2054645daaabSAlan Stern ; /* No change to wakeup settings */ 2055645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 2056ddbe1fcaSLu Baolu wakeup = (udev->quirks & 2057ddbe1fcaSLu Baolu USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : 2058ddbe1fcaSLu Baolu udev->actconfig->desc.bmAttributes & 2059ddbe1fcaSLu Baolu USB_CONFIG_ATT_WAKEUP; 2060645daaabSAlan Stern else 20614681b171SRafael J. Wysocki wakeup = 0; 2062fb669cc0SDavid Brownell } 206315123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 206415123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 206515123006SSarah Sharp udev->active_duration -= jiffies; 206615123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 206715123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 206815123006SSarah Sharp udev->active_duration += jiffies; 2069645daaabSAlan Stern udev->state = new_state; 2070b94dc6b5SDavid Brownell } else 20711da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 20721da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 20734681b171SRafael J. Wysocki if (wakeup >= 0) 20744681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 20751da177e4SLinus Torvalds } 20766da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 20771da177e4SLinus Torvalds 20788af548dcSInaky Perez-Gonzalez /* 20793b29b68bSAlan Stern * Choose a device number. 20803b29b68bSAlan Stern * 20813b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 20823b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 20833b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 20843b29b68bSAlan Stern * and it usually is not the same as the device number. 20853b29b68bSAlan Stern * 20868af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 20878af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 20888af548dcSInaky Perez-Gonzalez * life of the device connection logic in 20898af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 20908af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 20918af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 20928af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 20938af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 20948af548dcSInaky Perez-Gonzalez * [X | 0x80]. 20958af548dcSInaky Perez-Gonzalez * 20968af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 20978af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 20988af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 20998af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 21008af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 2101c6515272SSarah Sharp * 2102c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 2103c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 2104c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 2105c6515272SSarah Sharp * command to the hardware. 21068af548dcSInaky Perez-Gonzalez */ 21073b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 21081da177e4SLinus Torvalds { 21091da177e4SLinus Torvalds int devnum; 21101da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 21111da177e4SLinus Torvalds 2112638139ebSPetr Mladek /* be safe when more hub events are proceed in parallel */ 2113feb26ac3SChris Bainbridge mutex_lock(&bus->devnum_next_mutex); 21148af548dcSInaky Perez-Gonzalez if (udev->wusb) { 21158af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 21168af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 21178af548dcSInaky Perez-Gonzalez } else { 21188af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 21198af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 21201da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 21211da177e4SLinus Torvalds bus->devnum_next); 21221da177e4SLinus Torvalds if (devnum >= 128) 21238af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 21248af548dcSInaky Perez-Gonzalez 128, 1); 21251da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 21268af548dcSInaky Perez-Gonzalez } 21271da177e4SLinus Torvalds if (devnum < 128) { 21281da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 21291da177e4SLinus Torvalds udev->devnum = devnum; 21301da177e4SLinus Torvalds } 2131feb26ac3SChris Bainbridge mutex_unlock(&bus->devnum_next_mutex); 21321da177e4SLinus Torvalds } 21331da177e4SLinus Torvalds 21343b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 21351da177e4SLinus Torvalds { 21361da177e4SLinus Torvalds if (udev->devnum > 0) { 21371da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 21381da177e4SLinus Torvalds udev->devnum = -1; 21391da177e4SLinus Torvalds } 21401da177e4SLinus Torvalds } 21411da177e4SLinus Torvalds 21423b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 21434953d141SDavid Vrabel { 21444953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 21454953d141SDavid Vrabel if (!udev->wusb) 21464953d141SDavid Vrabel udev->devnum = devnum; 21474998f1efSJim Lin if (!udev->devaddr) 21484998f1efSJim Lin udev->devaddr = (u8)devnum; 21494953d141SDavid Vrabel } 21504953d141SDavid Vrabel 2151f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2152f7410cedSHerbert Xu { 2153f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2154f7410cedSHerbert Xu 2155f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2156f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2157f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2158f7410cedSHerbert Xu } 2159f7410cedSHerbert Xu 21607027df36SDan Williams static void hub_disconnect_children(struct usb_device *udev) 21617027df36SDan Williams { 21627027df36SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev); 21637027df36SDan Williams int i; 21647027df36SDan Williams 21657027df36SDan Williams /* Free up all the children before we remove this device */ 21667027df36SDan Williams for (i = 0; i < udev->maxchild; i++) { 21677027df36SDan Williams if (hub->ports[i]->child) 21687027df36SDan Williams usb_disconnect(&hub->ports[i]->child); 21697027df36SDan Williams } 21707027df36SDan Williams } 21717027df36SDan Williams 21721da177e4SLinus Torvalds /** 21731da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 21741da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 217541631d36SAhmed S. Darwish * 217641631d36SAhmed S. Darwish * Context: task context, might sleep 21771da177e4SLinus Torvalds * 21781da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 21791da177e4SLinus Torvalds * 21801da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2181a4b5d606SHeiner Kallweit * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, 2182db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 21831da177e4SLinus Torvalds * 21841da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 21851da177e4SLinus Torvalds * controllers) should ever call this. 21861da177e4SLinus Torvalds * 21871da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 21881da177e4SLinus Torvalds */ 21891da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 21901da177e4SLinus Torvalds { 21917027df36SDan Williams struct usb_port *port_dev = NULL; 21921da177e4SLinus Torvalds struct usb_device *udev = *pdev; 21935b1dc209SPeter Chen struct usb_hub *hub = NULL; 21945b1dc209SPeter Chen int port1 = 1; 21951da177e4SLinus Torvalds 21961da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 21971da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 219825985edcSLucas De Marchi * this quiesces everything except pending urbs. 21991da177e4SLinus Torvalds */ 22001da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 22013b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 22023b29b68bSAlan Stern udev->devnum); 22031da177e4SLinus Torvalds 2204f5cccf49SGuenter Roeck /* 2205f5cccf49SGuenter Roeck * Ensure that the pm runtime code knows that the USB device 2206f5cccf49SGuenter Roeck * is in the process of being disconnected. 2207f5cccf49SGuenter Roeck */ 2208f5cccf49SGuenter Roeck pm_runtime_barrier(&udev->dev); 2209f5cccf49SGuenter Roeck 22109ad3d6ccSAlan Stern usb_lock_device(udev); 22119ad3d6ccSAlan Stern 22127027df36SDan Williams hub_disconnect_children(udev); 22131da177e4SLinus Torvalds 22141da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 22151da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 22161da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 22171da177e4SLinus Torvalds */ 2218782da727SAlan Stern dev_dbg(&udev->dev, "unregistering device\n"); 22191da177e4SLinus Torvalds usb_disable_device(udev, 0); 2220cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 22211da177e4SLinus Torvalds 2222fde26380SLan Tianyu if (udev->parent) { 22237027df36SDan Williams port1 = udev->portnum; 22247027df36SDan Williams hub = usb_hub_to_struct_hub(udev->parent); 22257027df36SDan Williams port_dev = hub->ports[port1 - 1]; 2226fde26380SLan Tianyu 2227fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2228fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2229971fcd49SLan Tianyu 22307027df36SDan Williams /* 22317027df36SDan Williams * As usb_port_runtime_resume() de-references udev, make 22327027df36SDan Williams * sure no resumes occur during removal 22337027df36SDan Williams */ 22347027df36SDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 22357027df36SDan Williams pm_runtime_get_sync(&port_dev->dev); 2236fde26380SLan Tianyu } 2237fde26380SLan Tianyu 22383b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2239782da727SAlan Stern usb_unlock_device(udev); 22403099e75aSGreg Kroah-Hartman 2241782da727SAlan Stern /* Unregister the device. The device driver is responsible 22423b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 22433b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2244782da727SAlan Stern */ 2245782da727SAlan Stern device_del(&udev->dev); 2246782da727SAlan Stern 2247782da727SAlan Stern /* Free the device number and delete the parent's children[] 22481da177e4SLinus Torvalds * (or root_hub) pointer. 22491da177e4SLinus Torvalds */ 22503b29b68bSAlan Stern release_devnum(udev); 22511da177e4SLinus Torvalds 22521da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 22531da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 22541da177e4SLinus Torvalds *pdev = NULL; 22551da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 22561da177e4SLinus Torvalds 22577027df36SDan Williams if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) 22587027df36SDan Williams pm_runtime_put(&port_dev->dev); 22597027df36SDan Williams 2260f7410cedSHerbert Xu hub_free_dev(udev); 2261f7410cedSHerbert Xu 2262782da727SAlan Stern put_device(&udev->dev); 22631da177e4SLinus Torvalds } 22641da177e4SLinus Torvalds 2265f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 22661da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 22671da177e4SLinus Torvalds { 22681da177e4SLinus Torvalds if (!string) 22691da177e4SLinus Torvalds return; 2270f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 22711da177e4SLinus Torvalds } 22721da177e4SLinus Torvalds 2273f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2274f2a383e4SGreg Kroah-Hartman { 227573c6d3b2SBenson Leung u16 bcdDevice = le16_to_cpu(udev->descriptor.bcdDevice); 227673c6d3b2SBenson Leung 227773c6d3b2SBenson Leung dev_info(&udev->dev, 227873c6d3b2SBenson Leung "New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%2x.%02x\n", 2279f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 228073c6d3b2SBenson Leung le16_to_cpu(udev->descriptor.idProduct), 228173c6d3b2SBenson Leung bcdDevice >> 8, bcdDevice & 0xff); 2282b9cef6c3SWu Fengguang dev_info(&udev->dev, 2283b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2284f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2285f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2286f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2287f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2288f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2289f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2290f2a383e4SGreg Kroah-Hartman } 22911da177e4SLinus Torvalds #else 2292f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 22931da177e4SLinus Torvalds #endif 22941da177e4SLinus Torvalds 22951da177e4SLinus Torvalds 22963ede760fSOliver Neukum /** 22978d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 22983ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 22993ede760fSOliver Neukum * 23008d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2301626f090cSYacine Belkadi * 2302626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 23033ede760fSOliver Neukum */ 23048d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 23051da177e4SLinus Torvalds { 2306d9d16e8aSInaky Perez-Gonzalez int err = 0; 23071da177e4SLinus Torvalds 23081da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 23091da177e4SLinus Torvalds /* 23101da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 23111da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 23121da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 23131da177e4SLinus Torvalds */ 23141da177e4SLinus Torvalds if (!udev->bus->is_b_host 23151da177e4SLinus Torvalds && udev->config 23161da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 23172eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 23181da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 231912c3da34SAlan Stern unsigned port1 = udev->portnum; 23201da177e4SLinus Torvalds 23217d2d641cSLi Jun /* descriptor may appear anywhere in config */ 23227d2d641cSLi Jun err = __usb_get_extra_descriptor(udev->rawdescriptors[0], 23237d2d641cSLi Jun le16_to_cpu(udev->config[0].desc.wTotalLength), 2324704620afSMathias Payer USB_DT_OTG, (void **) &desc, sizeof(*desc)); 23257d2d641cSLi Jun if (err || !(desc->bmAttributes & USB_OTG_HNP)) 23267d2d641cSLi Jun return 0; 23277d2d641cSLi Jun 23287d2d641cSLi Jun dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", 23297d2d641cSLi Jun (port1 == bus->otg_port) ? "" : "non-"); 23301da177e4SLinus Torvalds 23311da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 23327d2d641cSLi Jun if (port1 == bus->otg_port) { 23331da177e4SLinus Torvalds bus->b_hnp_enable = 1; 23341afe33a7SOliver Neukum err = usb_control_msg(udev, 23351afe33a7SOliver Neukum usb_sndctrlpipe(udev, 0), 23361afe33a7SOliver Neukum USB_REQ_SET_FEATURE, 0, 23371afe33a7SOliver Neukum USB_DEVICE_B_HNP_ENABLE, 23381afe33a7SOliver Neukum 0, NULL, 0, 23391afe33a7SOliver Neukum USB_CTRL_SET_TIMEOUT); 23401afe33a7SOliver Neukum if (err < 0) { 23417d2d641cSLi Jun /* 23427d2d641cSLi Jun * OTG MESSAGE: report errors here, 23431da177e4SLinus Torvalds * customize to match your product. 23441da177e4SLinus Torvalds */ 23457d2d641cSLi Jun dev_err(&udev->dev, "can't set HNP mode: %d\n", 23461da177e4SLinus Torvalds err); 23471da177e4SLinus Torvalds bus->b_hnp_enable = 0; 23481da177e4SLinus Torvalds } 23497d2d641cSLi Jun } else if (desc->bLength == sizeof 23507d2d641cSLi Jun (struct usb_otg_descriptor)) { 23517d2d641cSLi Jun /* Set a_alt_hnp_support for legacy otg device */ 23521afe33a7SOliver Neukum err = usb_control_msg(udev, 23531afe33a7SOliver Neukum usb_sndctrlpipe(udev, 0), 23541afe33a7SOliver Neukum USB_REQ_SET_FEATURE, 0, 23551afe33a7SOliver Neukum USB_DEVICE_A_ALT_HNP_SUPPORT, 23561afe33a7SOliver Neukum 0, NULL, 0, 23571afe33a7SOliver Neukum USB_CTRL_SET_TIMEOUT); 23581afe33a7SOliver Neukum if (err < 0) 23597d2d641cSLi Jun dev_err(&udev->dev, 23607d2d641cSLi Jun "set a_alt_hnp_support failed: %d\n", 23617d2d641cSLi Jun err); 23621da177e4SLinus Torvalds } 23631da177e4SLinus Torvalds } 23641da177e4SLinus Torvalds #endif 2365d9d16e8aSInaky Perez-Gonzalez return err; 2366d9d16e8aSInaky Perez-Gonzalez } 23671da177e4SLinus Torvalds 2368d9d16e8aSInaky Perez-Gonzalez 2369d9d16e8aSInaky Perez-Gonzalez /** 23708d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2371d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2372d9d16e8aSInaky Perez-Gonzalez * 2373d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2374d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2375d9d16e8aSInaky Perez-Gonzalez * environment. 2376d9d16e8aSInaky Perez-Gonzalez * 2377d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2378d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2379d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2380626f090cSYacine Belkadi * 2381626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2382d9d16e8aSInaky Perez-Gonzalez */ 23838d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2384d9d16e8aSInaky Perez-Gonzalez { 2385d9d16e8aSInaky Perez-Gonzalez int err; 2386026f3fcbSPeter Chen struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2387d9d16e8aSInaky Perez-Gonzalez 2388d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2389d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2390d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2391e9e88fb7SAlan Stern if (err != -ENODEV) 2392d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2393d9d16e8aSInaky Perez-Gonzalez err); 239480da2e0dSLaurent Pinchart return err; 2395d9d16e8aSInaky Perez-Gonzalez } 2396d9d16e8aSInaky Perez-Gonzalez } 239783e83ecbSThomas Pugliese 2398d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2399d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2400d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2401d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2402d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 240383e83ecbSThomas Pugliese 24048d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 240580da2e0dSLaurent Pinchart if (err < 0) 2406d9d16e8aSInaky Perez-Gonzalez return err; 240780da2e0dSLaurent Pinchart 2408f8f02d5cSGreg Kroah-Hartman if (IS_ENABLED(CONFIG_USB_OTG_PRODUCTLIST) && hcd->tpl_support && 2409e5a9d621SPeter Chen !is_targeted(udev)) { 2410026f3fcbSPeter Chen /* Maybe it can talk to us, though we can't talk to it. 2411026f3fcbSPeter Chen * (Includes HNP test device.) 2412026f3fcbSPeter Chen */ 2413e5a9d621SPeter Chen if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable 2414e5a9d621SPeter Chen || udev->bus->is_b_host)) { 2415026f3fcbSPeter Chen err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); 2416026f3fcbSPeter Chen if (err < 0) 2417026f3fcbSPeter Chen dev_dbg(&udev->dev, "HNP fail, %d\n", err); 2418026f3fcbSPeter Chen } 2419026f3fcbSPeter Chen return -ENOTSUPP; 2420026f3fcbSPeter Chen } 2421026f3fcbSPeter Chen 242280da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 242380da2e0dSLaurent Pinchart 242480da2e0dSLaurent Pinchart return 0; 2425d9d16e8aSInaky Perez-Gonzalez } 2426d9d16e8aSInaky Perez-Gonzalez 2427d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2428d35e70d5SMatthew Garrett { 2429d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2430d35e70d5SMatthew Garrett struct usb_hub *hub; 2431d35e70d5SMatthew Garrett u8 port = udev->portnum; 2432d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2433d35e70d5SMatthew Garrett bool removable = true; 2434d35e70d5SMatthew Garrett 2435d35e70d5SMatthew Garrett if (!hdev) 2436d35e70d5SMatthew Garrett return; 2437d35e70d5SMatthew Garrett 2438ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2439d35e70d5SMatthew Garrett 244092bfbf71SMatthew Garrett /* 244192bfbf71SMatthew Garrett * If the platform firmware has provided information about a port, 244292bfbf71SMatthew Garrett * use that to determine whether it's removable. 244392bfbf71SMatthew Garrett */ 244492bfbf71SMatthew Garrett switch (hub->ports[udev->portnum - 1]->connect_type) { 244592bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HOT_PLUG: 244692bfbf71SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 244792bfbf71SMatthew Garrett return; 244892bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HARD_WIRED: 244958339c2eSMatthew Garrett case USB_PORT_NOT_USED: 245092bfbf71SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 245192bfbf71SMatthew Garrett return; 245258339c2eSMatthew Garrett default: 245358339c2eSMatthew Garrett break; 245492bfbf71SMatthew Garrett } 245592bfbf71SMatthew Garrett 245692bfbf71SMatthew Garrett /* 245792bfbf71SMatthew Garrett * Otherwise, check whether the hub knows whether a port is removable 245892bfbf71SMatthew Garrett * or not 245992bfbf71SMatthew Garrett */ 2460d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2461d35e70d5SMatthew Garrett 2462d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2463d35e70d5SMatthew Garrett return; 2464d35e70d5SMatthew Garrett 2465d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2466ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2467ca3c1539SLan Tianyu & (1 << port)) 2468d35e70d5SMatthew Garrett removable = false; 2469d35e70d5SMatthew Garrett } else { 2470d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2471d35e70d5SMatthew Garrett removable = false; 2472d35e70d5SMatthew Garrett } 2473d35e70d5SMatthew Garrett 2474d35e70d5SMatthew Garrett if (removable) 2475d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2476d35e70d5SMatthew Garrett else 2477d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2478a4204ff0SDan Williams 2479d35e70d5SMatthew Garrett } 2480d9d16e8aSInaky Perez-Gonzalez 2481d9d16e8aSInaky Perez-Gonzalez /** 2482d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2483d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2484d9d16e8aSInaky Perez-Gonzalez * 24858d8558d1SAlan Stern * This is called with devices which have been detected but not fully 24868d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2487d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2488d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2489a4b5d606SHeiner Kallweit * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to 2490d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2491d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2492d9d16e8aSInaky Perez-Gonzalez * 2493d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2494d9d16e8aSInaky Perez-Gonzalez * 2495d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2496626f090cSYacine Belkadi * 2497626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2498626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2499626f090cSYacine Belkadi * value. 2500626f090cSYacine Belkadi * 2501d9d16e8aSInaky Perez-Gonzalez */ 2502d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2503d9d16e8aSInaky Perez-Gonzalez { 2504d9d16e8aSInaky Perez-Gonzalez int err; 2505d9d16e8aSInaky Perez-Gonzalez 250616985408SDan Streetman if (udev->parent) { 250716985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 250816985408SDan Streetman * device (un)configuration controls wakeup capable 250916985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 251016985408SDan Streetman */ 251116985408SDan Streetman device_init_wakeup(&udev->dev, 0); 251216985408SDan Streetman } 251316985408SDan Streetman 25149bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 25159bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2516c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2517fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 25189bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 25199bbdf1e0SAlan Stern 2520c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2521c08512c7SAlan Stern * allowed for hubs during binding. 2522c08512c7SAlan Stern */ 2523c08512c7SAlan Stern usb_disable_autosuspend(udev); 2524c08512c7SAlan Stern 25258d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2526d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2527d9d16e8aSInaky Perez-Gonzalez goto fail; 2528c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2529c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2530c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 25319f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 25329f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 25339f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 25349f8b17e6SKay Sievers 25356cd13201SAlan Stern /* Tell the world! */ 25366cd13201SAlan Stern announce_device(udev); 2537195af2ccSAlan Stern 2538b04b3156STheodore Ts'o if (udev->serial) 2539b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2540b04b3156STheodore Ts'o if (udev->product) 2541b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2542b04b3156STheodore Ts'o if (udev->manufacturer) 2543b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2544b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2545b04b3156STheodore Ts'o 2546927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2547d35e70d5SMatthew Garrett 2548a4204ff0SDan Williams /* check whether the hub or firmware marks this port as non-removable */ 2549d35e70d5SMatthew Garrett if (udev->parent) 2550d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2551d35e70d5SMatthew Garrett 2552782da727SAlan Stern /* Register the device. The device driver is responsible 25533b23dd6fSAlan Stern * for configuring the device and invoking the add-device 25543b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2555782da727SAlan Stern */ 25561da177e4SLinus Torvalds err = device_add(&udev->dev); 25571da177e4SLinus Torvalds if (err) { 25581da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 25591da177e4SLinus Torvalds goto fail; 25601da177e4SLinus Torvalds } 25619ad3d6ccSAlan Stern 2562fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2563fde26380SLan Tianyu if (udev->parent) { 2564ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2565d5c3834eSDan Williams int port1 = udev->portnum; 2566d5c3834eSDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 2567fde26380SLan Tianyu 2568fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2569fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2570fde26380SLan Tianyu if (err) 2571fde26380SLan Tianyu goto fail; 2572fde26380SLan Tianyu 2573fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2574fde26380SLan Tianyu &udev->dev.kobj, "device"); 2575fde26380SLan Tianyu if (err) { 2576fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2577fde26380SLan Tianyu goto fail; 2578fde26380SLan Tianyu } 2579971fcd49SLan Tianyu 2580d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 2581971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2582fde26380SLan Tianyu } 2583fde26380SLan Tianyu 25843b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2585c08512c7SAlan Stern usb_mark_last_busy(udev); 2586c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2587c066475eSGreg Kroah-Hartman return err; 25881da177e4SLinus Torvalds 25891da177e4SLinus Torvalds fail: 25901da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 25919bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 25929bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2593d9d16e8aSInaky Perez-Gonzalez return err; 25941da177e4SLinus Torvalds } 25951da177e4SLinus Torvalds 259693993a0aSInaky Perez-Gonzalez 259793993a0aSInaky Perez-Gonzalez /** 2598fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2599fd39c86bSRandy Dunlap * @usb_dev: USB device 2600fd39c86bSRandy Dunlap * 2601fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2602fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 260393993a0aSInaky Perez-Gonzalez * 260493993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 260593993a0aSInaky Perez-Gonzalez * defer its call. 2606626f090cSYacine Belkadi * 2607626f090cSYacine Belkadi * Return: 0. 260893993a0aSInaky Perez-Gonzalez */ 260993993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 261093993a0aSInaky Perez-Gonzalez { 261193993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 261293993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 261393993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2614da307123SAlan Stern 261593993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 261693993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2617da307123SAlan Stern 261893993a0aSInaky Perez-Gonzalez out_unauthorized: 261993993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 262093993a0aSInaky Perez-Gonzalez return 0; 262193993a0aSInaky Perez-Gonzalez } 262293993a0aSInaky Perez-Gonzalez 262393993a0aSInaky Perez-Gonzalez 262493993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 262593993a0aSInaky Perez-Gonzalez { 262693993a0aSInaky Perez-Gonzalez int result = 0, c; 2627da307123SAlan Stern 262893993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 262993993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 263093993a0aSInaky Perez-Gonzalez goto out_authorized; 2631da307123SAlan Stern 263293993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 263393993a0aSInaky Perez-Gonzalez if (result < 0) { 263493993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 263593993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 263693993a0aSInaky Perez-Gonzalez goto error_autoresume; 263793993a0aSInaky Perez-Gonzalez } 2638e50a322eSJosef Gajdusek 2639e50a322eSJosef Gajdusek if (usb_dev->wusb) { 264093993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 264193993a0aSInaky Perez-Gonzalez if (result < 0) { 264293993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 264393993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 264493993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 264593993a0aSInaky Perez-Gonzalez } 2646e50a322eSJosef Gajdusek } 2647da307123SAlan Stern 264893993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 264993993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 265093993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 265193993a0aSInaky Perez-Gonzalez */ 2652b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 265393993a0aSInaky Perez-Gonzalez if (c >= 0) { 265493993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 265593993a0aSInaky Perez-Gonzalez if (result) { 265693993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 265793993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 265893993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 265993993a0aSInaky Perez-Gonzalez * set other configurations. */ 266093993a0aSInaky Perez-Gonzalez } 266193993a0aSInaky Perez-Gonzalez } 266293993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2663da307123SAlan Stern 266493993a0aSInaky Perez-Gonzalez error_device_descriptor: 2665da307123SAlan Stern usb_autosuspend_device(usb_dev); 266693993a0aSInaky Perez-Gonzalez error_autoresume: 266793993a0aSInaky Perez-Gonzalez out_authorized: 2668781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 266993993a0aSInaky Perez-Gonzalez return result; 267093993a0aSInaky Perez-Gonzalez } 267193993a0aSInaky Perez-Gonzalez 26720299809bSThinh Nguyen /** 26730299809bSThinh Nguyen * get_port_ssp_rate - Match the extended port status to SSP rate 26740299809bSThinh Nguyen * @hdev: The hub device 26750299809bSThinh Nguyen * @ext_portstatus: extended port status 26760299809bSThinh Nguyen * 26770299809bSThinh Nguyen * Match the extended port status speed id to the SuperSpeed Plus sublink speed 26780299809bSThinh Nguyen * capability attributes. Base on the number of connected lanes and speed, 26790299809bSThinh Nguyen * return the corresponding enum usb_ssp_rate. 26800299809bSThinh Nguyen */ 26810299809bSThinh Nguyen static enum usb_ssp_rate get_port_ssp_rate(struct usb_device *hdev, 26820299809bSThinh Nguyen u32 ext_portstatus) 26830299809bSThinh Nguyen { 26840299809bSThinh Nguyen struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; 26850299809bSThinh Nguyen u32 attr; 26860299809bSThinh Nguyen u8 speed_id; 26870299809bSThinh Nguyen u8 ssac; 26880299809bSThinh Nguyen u8 lanes; 26890299809bSThinh Nguyen int i; 26900299809bSThinh Nguyen 26910299809bSThinh Nguyen if (!ssp_cap) 26920299809bSThinh Nguyen goto out; 26930299809bSThinh Nguyen 26940299809bSThinh Nguyen speed_id = ext_portstatus & USB_EXT_PORT_STAT_RX_SPEED_ID; 26950299809bSThinh Nguyen lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1; 26960299809bSThinh Nguyen 26970299809bSThinh Nguyen ssac = le32_to_cpu(ssp_cap->bmAttributes) & 26980299809bSThinh Nguyen USB_SSP_SUBLINK_SPEED_ATTRIBS; 26990299809bSThinh Nguyen 27000299809bSThinh Nguyen for (i = 0; i <= ssac; i++) { 27010299809bSThinh Nguyen u8 ssid; 27020299809bSThinh Nguyen 27030299809bSThinh Nguyen attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); 27040299809bSThinh Nguyen ssid = FIELD_GET(USB_SSP_SUBLINK_SPEED_SSID, attr); 27050299809bSThinh Nguyen if (speed_id == ssid) { 27060299809bSThinh Nguyen u16 mantissa; 27070299809bSThinh Nguyen u8 lse; 27080299809bSThinh Nguyen u8 type; 27090299809bSThinh Nguyen 27100299809bSThinh Nguyen /* 27110299809bSThinh Nguyen * Note: currently asymmetric lane types are only 27120299809bSThinh Nguyen * applicable for SSIC operate in SuperSpeed protocol 27130299809bSThinh Nguyen */ 27140299809bSThinh Nguyen type = FIELD_GET(USB_SSP_SUBLINK_SPEED_ST, attr); 27150299809bSThinh Nguyen if (type == USB_SSP_SUBLINK_SPEED_ST_ASYM_RX || 27160299809bSThinh Nguyen type == USB_SSP_SUBLINK_SPEED_ST_ASYM_TX) 27170299809bSThinh Nguyen goto out; 27180299809bSThinh Nguyen 27190299809bSThinh Nguyen if (FIELD_GET(USB_SSP_SUBLINK_SPEED_LP, attr) != 27200299809bSThinh Nguyen USB_SSP_SUBLINK_SPEED_LP_SSP) 27210299809bSThinh Nguyen goto out; 27220299809bSThinh Nguyen 27230299809bSThinh Nguyen lse = FIELD_GET(USB_SSP_SUBLINK_SPEED_LSE, attr); 27240299809bSThinh Nguyen mantissa = FIELD_GET(USB_SSP_SUBLINK_SPEED_LSM, attr); 27250299809bSThinh Nguyen 27260299809bSThinh Nguyen /* Convert to Gbps */ 27270299809bSThinh Nguyen for (; lse < USB_SSP_SUBLINK_SPEED_LSE_GBPS; lse++) 27280299809bSThinh Nguyen mantissa /= 1000; 27290299809bSThinh Nguyen 27300299809bSThinh Nguyen if (mantissa >= 10 && lanes == 1) 27310299809bSThinh Nguyen return USB_SSP_GEN_2x1; 27320299809bSThinh Nguyen 27330299809bSThinh Nguyen if (mantissa >= 10 && lanes == 2) 27340299809bSThinh Nguyen return USB_SSP_GEN_2x2; 27350299809bSThinh Nguyen 27360299809bSThinh Nguyen if (mantissa >= 5 && lanes == 2) 27370299809bSThinh Nguyen return USB_SSP_GEN_1x2; 27380299809bSThinh Nguyen 27390299809bSThinh Nguyen goto out; 27400299809bSThinh Nguyen } 27410299809bSThinh Nguyen } 27420299809bSThinh Nguyen 27430299809bSThinh Nguyen out: 27440299809bSThinh Nguyen return USB_SSP_GEN_UNKNOWN; 27450299809bSThinh Nguyen } 27460299809bSThinh Nguyen 27470165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 27480165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 27490165de09SInaky Perez-Gonzalez { 27500165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 27510165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 27520165de09SInaky Perez-Gonzalez return 0; 27536ae706aeSGeliang Tang hcd = bus_to_hcd(hub->hdev->bus); 27540165de09SInaky Perez-Gonzalez return hcd->wireless; 27550165de09SInaky Perez-Gonzalez } 27560165de09SInaky Perez-Gonzalez 27570165de09SInaky Perez-Gonzalez 2758fb6f076dSAlan Stern #ifdef CONFIG_USB_FEW_INIT_RETRIES 2759fb6f076dSAlan Stern #define PORT_RESET_TRIES 2 2760fb6f076dSAlan Stern #define SET_ADDRESS_TRIES 1 2761fb6f076dSAlan Stern #define GET_DESCRIPTOR_TRIES 1 2762fb6f076dSAlan Stern #define GET_MAXPACKET0_TRIES 1 2763fb6f076dSAlan Stern #define PORT_INIT_TRIES 4 2764fb6f076dSAlan Stern 2765fb6f076dSAlan Stern #else 27661da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 27671da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 27681da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 2769fb6f076dSAlan Stern #define GET_MAXPACKET0_TRIES 3 277019502e69SAlan Stern #define PORT_INIT_TRIES 4 2771fb6f076dSAlan Stern #endif /* CONFIG_USB_FEW_INIT_RETRIES */ 27721da177e4SLinus Torvalds 277374072baeSMathias Nyman #define HUB_ROOT_RESET_TIME 60 /* times are in msec */ 27741da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 277575d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 27761da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 277777c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 27781da177e4SLinus Torvalds 277919502e69SAlan Stern static bool use_new_scheme(struct usb_device *udev, int retry, 278019502e69SAlan Stern struct usb_port *port_dev) 278119502e69SAlan Stern { 278219502e69SAlan Stern int old_scheme_first_port = 278319502e69SAlan Stern (port_dev->quirks & USB_PORT_QUIRK_OLD_SCHEME) || 278419502e69SAlan Stern old_scheme_first; 278519502e69SAlan Stern 278648fc7dbdSDan Williams /* 278748fc7dbdSDan Williams * "New scheme" enumeration causes an extra state transition to be 278848fc7dbdSDan Williams * exposed to an xhci host and causes USB3 devices to receive control 278948fc7dbdSDan Williams * commands in the default state. This has been seen to cause 279048fc7dbdSDan Williams * enumeration failures, so disable this enumeration scheme for USB3 279148fc7dbdSDan Williams * devices. 279248fc7dbdSDan Williams */ 27938a1b2725SMathias Nyman if (udev->speed >= USB_SPEED_SUPER) 279448fc7dbdSDan Williams return false; 279548fc7dbdSDan Williams 279619502e69SAlan Stern /* 279719502e69SAlan Stern * If use_both_schemes is set, use the first scheme (whichever 279819502e69SAlan Stern * it is) for the larger half of the retries, then use the other 279919502e69SAlan Stern * scheme. Otherwise, use the first scheme for all the retries. 280019502e69SAlan Stern */ 280119502e69SAlan Stern if (use_both_schemes && retry >= (PORT_INIT_TRIES + 1) / 2) 280219502e69SAlan Stern return old_scheme_first_port; /* Second half */ 280319502e69SAlan Stern return !old_scheme_first_port; /* First half or all */ 280448fc7dbdSDan Williams } 280548fc7dbdSDan Williams 2806025d4430SRahul Bedarkar /* Is a USB 3.0 port in the Inactive or Compliance Mode state? 2807d46a6024SHarry Pan * Port warm reset is required to recover 28088bea2bd3SStanislaw Ledwon */ 28093cd12f91SDan Williams static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, 28103cd12f91SDan Williams u16 portstatus) 281110d674a8SSarah Sharp { 28123cd12f91SDan Williams u16 link_state; 28133cd12f91SDan Williams 28143cd12f91SDan Williams if (!hub_is_superspeed(hub->hdev)) 28153cd12f91SDan Williams return false; 28163cd12f91SDan Williams 28173cd12f91SDan Williams if (test_bit(port1, hub->warm_reset_bits)) 28183cd12f91SDan Williams return true; 28193cd12f91SDan Williams 28203cd12f91SDan Williams link_state = portstatus & USB_PORT_STAT_LINK_STATE; 28213cd12f91SDan Williams return link_state == USB_SS_PORT_LS_SS_INACTIVE 28223cd12f91SDan Williams || link_state == USB_SS_PORT_LS_COMP_MOD; 282310d674a8SSarah Sharp } 282410d674a8SSarah Sharp 28251da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 282675d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 28271da177e4SLinus Torvalds { 28281da177e4SLinus Torvalds int delay_time, ret; 28291da177e4SLinus Torvalds u16 portstatus; 28301da177e4SLinus Torvalds u16 portchange; 28310cdd49a1SMathias Nyman u32 ext_portstatus = 0; 28321da177e4SLinus Torvalds 28331da177e4SLinus Torvalds for (delay_time = 0; 28341da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 28351da177e4SLinus Torvalds delay_time += delay) { 28361da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 28371da177e4SLinus Torvalds msleep(delay); 28381da177e4SLinus Torvalds 28391da177e4SLinus Torvalds /* read and decode port status */ 28400cdd49a1SMathias Nyman if (hub_is_superspeedplus(hub->hdev)) 28410cdd49a1SMathias Nyman ret = hub_ext_port_status(hub, port1, 28420cdd49a1SMathias Nyman HUB_EXT_PORT_STATUS, 28430cdd49a1SMathias Nyman &portstatus, &portchange, 28440cdd49a1SMathias Nyman &ext_portstatus); 28450cdd49a1SMathias Nyman else 28460cdd49a1SMathias Nyman ret = hub_port_status(hub, port1, &portstatus, 28470cdd49a1SMathias Nyman &portchange); 28481da177e4SLinus Torvalds if (ret < 0) 28491da177e4SLinus Torvalds return ret; 28501da177e4SLinus Torvalds 285122547c4cSGuenter Roeck /* 285222547c4cSGuenter Roeck * The port state is unknown until the reset completes. 285322547c4cSGuenter Roeck * 285422547c4cSGuenter Roeck * On top of that, some chips may require additional time 285522547c4cSGuenter Roeck * to re-establish a connection after the reset is complete, 285622547c4cSGuenter Roeck * so also wait for the connection to be re-established. 285722547c4cSGuenter Roeck */ 285822547c4cSGuenter Roeck if (!(portstatus & USB_PORT_STAT_RESET) && 285922547c4cSGuenter Roeck (portstatus & USB_PORT_STAT_CONNECTION)) 2860470f0be8SSarah Sharp break; 2861470f0be8SSarah Sharp 2862470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2863470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2864470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2865470f0be8SSarah Sharp 2866d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, 2867d99f6b41SDan Williams "not %sreset yet, waiting %dms\n", 2868d99f6b41SDan Williams warm ? "warm " : "", delay); 2869470f0be8SSarah Sharp } 2870470f0be8SSarah Sharp 28714f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2872470f0be8SSarah Sharp return -EBUSY; 28734f43447eSSarah Sharp 28743cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) 2875a24a6078SSarah Sharp return -ENOTCONN; 287610d674a8SSarah Sharp 28771da177e4SLinus Torvalds /* Device went away? */ 28781da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 28791da177e4SLinus Torvalds return -ENOTCONN; 28801da177e4SLinus Torvalds 28811ac7db63SMathias Nyman /* Retry if connect change is set but status is still connected. 28821ac7db63SMathias Nyman * A USB 3.0 connection may bounce if multiple warm resets were issued, 2883a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2884a24a6078SSarah Sharp */ 2885a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 28861ac7db63SMathias Nyman (portchange & USB_PORT_STAT_C_CONNECTION)) { 28871ac7db63SMathias Nyman usb_clear_port_feature(hub->hdev, port1, 28881ac7db63SMathias Nyman USB_PORT_FEAT_C_CONNECTION); 28891ac7db63SMathias Nyman return -EAGAIN; 28901ac7db63SMathias Nyman } 28911da177e4SLinus Torvalds 2892470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2893470f0be8SSarah Sharp return -EBUSY; 2894470f0be8SSarah Sharp 28952d4fa940SSarah Sharp if (!udev) 28962d4fa940SSarah Sharp return 0; 28972d4fa940SSarah Sharp 2898013eedb8SMathias Nyman if (hub_is_superspeedplus(hub->hdev)) { 2899013eedb8SMathias Nyman /* extended portstatus Rx and Tx lane count are zero based */ 2900013eedb8SMathias Nyman udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1; 2901013eedb8SMathias Nyman udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1; 29020299809bSThinh Nguyen udev->ssp_rate = get_port_ssp_rate(hub->hdev, ext_portstatus); 2903013eedb8SMathias Nyman } else { 2904013eedb8SMathias Nyman udev->rx_lanes = 1; 2905013eedb8SMathias Nyman udev->tx_lanes = 1; 29060299809bSThinh Nguyen udev->ssp_rate = USB_SSP_GEN_UNKNOWN; 2907013eedb8SMathias Nyman } 29080165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2909551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2910a59918cbSThinh Nguyen else if (udev->ssp_rate != USB_SSP_GEN_UNKNOWN) 29110cdd49a1SMathias Nyman udev->speed = USB_SPEED_SUPER_PLUS; 2912131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2913809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 29140165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 29151da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 29161da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 29171da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 29181da177e4SLinus Torvalds else 29191da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 29201da177e4SLinus Torvalds return 0; 29211da177e4SLinus Torvalds } 29221da177e4SLinus Torvalds 292375d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 292475d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 292575d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 292675d7cf72SAndiry Xu { 292775d7cf72SAndiry Xu int i, status; 2928a24a6078SSarah Sharp u16 portchange, portstatus; 2929d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 2930781f0766SKai-Heng Feng int reset_recovery_time; 293175d7cf72SAndiry Xu 293275d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 29330fe51aa5SSarah Sharp if (warm) { 293475d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 293575d7cf72SAndiry Xu "warm reset\n"); 293675d7cf72SAndiry Xu return -EINVAL; 293775d7cf72SAndiry Xu } 29380fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 29390fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 29400fe51aa5SSarah Sharp */ 29410fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2942d3b9d7a9SSarah Sharp } else if (!warm) { 2943d3b9d7a9SSarah Sharp /* 2944d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2945d3b9d7a9SSarah Sharp * double check and see if one is needed. 2946d3b9d7a9SSarah Sharp */ 2947fb6d1f7dSRobert Schlabbach if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) 2948fb6d1f7dSRobert Schlabbach if (hub_port_warm_reset_required(hub, port1, 2949fb6d1f7dSRobert Schlabbach portstatus)) 2950d3b9d7a9SSarah Sharp warm = true; 295175d7cf72SAndiry Xu } 29523cd12f91SDan Williams clear_bit(port1, hub->warm_reset_bits); 295375d7cf72SAndiry Xu 295475d7cf72SAndiry Xu /* Reset the port */ 295575d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 295675d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 295775d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 295875d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2959e9e88fb7SAlan Stern if (status == -ENODEV) { 2960e9e88fb7SAlan Stern ; /* The hub is gone */ 2961e9e88fb7SAlan Stern } else if (status) { 2962d99f6b41SDan Williams dev_err(&port_dev->dev, 2963d99f6b41SDan Williams "cannot %sreset (err = %d)\n", 2964d99f6b41SDan Williams warm ? "warm " : "", status); 296575d7cf72SAndiry Xu } else { 296675d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 296775d7cf72SAndiry Xu warm); 2968e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 296975d7cf72SAndiry Xu dev_dbg(hub->intfdev, 297075d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 297175d7cf72SAndiry Xu status); 297275d7cf72SAndiry Xu } 297375d7cf72SAndiry Xu 2974a24a6078SSarah Sharp /* Check for disconnect or reset */ 297575d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2976fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2977fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_RESET); 2978a24a6078SSarah Sharp 2979a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 298032fe0198SAlan Stern goto done; 2981a24a6078SSarah Sharp 2982fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2983fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_BH_PORT_RESET); 2984fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2985fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_PORT_LINK_STATE); 298622454b79SDennis Wassenberg 298722454b79SDennis Wassenberg if (udev) 2988fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2989fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_CONNECTION); 2990fb6d1f7dSRobert Schlabbach 2991a24a6078SSarah Sharp /* 2992a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2993a24a6078SSarah Sharp * state, re-issue the warm reset. 2994a24a6078SSarah Sharp */ 2995a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2996a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2997a24a6078SSarah Sharp goto done; 2998a24a6078SSarah Sharp 29993cd12f91SDan Williams if (!hub_port_warm_reset_required(hub, port1, 30003cd12f91SDan Williams portstatus)) 3001a24a6078SSarah Sharp goto done; 3002a24a6078SSarah Sharp 3003a24a6078SSarah Sharp /* 3004a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 3005a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 3006a24a6078SSarah Sharp */ 3007a24a6078SSarah Sharp if (!warm) { 3008d99f6b41SDan Williams dev_dbg(&port_dev->dev, 3009d99f6b41SDan Williams "hot reset failed, warm reset\n"); 3010a24a6078SSarah Sharp warm = true; 3011a24a6078SSarah Sharp } 30121da177e4SLinus Torvalds } 30131da177e4SLinus Torvalds 3014d99f6b41SDan Williams dev_dbg(&port_dev->dev, 3015d99f6b41SDan Williams "not enabled, trying %sreset again...\n", 3016d99f6b41SDan Williams warm ? "warm " : ""); 30171da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 30181da177e4SLinus Torvalds } 30191da177e4SLinus Torvalds 3020d99f6b41SDan Williams dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); 30211da177e4SLinus Torvalds 302232fe0198SAlan Stern done: 3023fb6d1f7dSRobert Schlabbach if (status == 0) { 3024aa071a92SNicolas Boichat if (port_dev->quirks & USB_PORT_QUIRK_FAST_ENUM) 3025aa071a92SNicolas Boichat usleep_range(10000, 12000); 3026781f0766SKai-Heng Feng else { 3027781f0766SKai-Heng Feng /* TRSTRCY = 10 ms; plus some extra */ 3028781f0766SKai-Heng Feng reset_recovery_time = 10 + 40; 3029781f0766SKai-Heng Feng 3030781f0766SKai-Heng Feng /* Hub needs extra delay after resetting its port. */ 3031781f0766SKai-Heng Feng if (hub->hdev->quirks & USB_QUIRK_HUB_SLOW_RESET) 3032781f0766SKai-Heng Feng reset_recovery_time += 100; 3033781f0766SKai-Heng Feng 3034781f0766SKai-Heng Feng msleep(reset_recovery_time); 3035781f0766SKai-Heng Feng } 3036aa071a92SNicolas Boichat 3037fb6d1f7dSRobert Schlabbach if (udev) { 3038fb6d1f7dSRobert Schlabbach struct usb_hcd *hcd = bus_to_hcd(udev->bus); 3039fb6d1f7dSRobert Schlabbach 3040fb6d1f7dSRobert Schlabbach update_devnum(udev, 0); 3041fb6d1f7dSRobert Schlabbach /* The xHC may think the device is already reset, 3042fb6d1f7dSRobert Schlabbach * so ignore the status. 3043fb6d1f7dSRobert Schlabbach */ 3044fb6d1f7dSRobert Schlabbach if (hcd->driver->reset_device) 3045fb6d1f7dSRobert Schlabbach hcd->driver->reset_device(hcd, udev); 3046fb6d1f7dSRobert Schlabbach 3047fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_DEFAULT); 3048fb6d1f7dSRobert Schlabbach } 3049fb6d1f7dSRobert Schlabbach } else { 3050fb6d1f7dSRobert Schlabbach if (udev) 3051fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_NOTATTACHED); 3052fb6d1f7dSRobert Schlabbach } 3053fb6d1f7dSRobert Schlabbach 30540fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 305532fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 305675d7cf72SAndiry Xu 30571da177e4SLinus Torvalds return status; 30581da177e4SLinus Torvalds } 30591da177e4SLinus Torvalds 30600ed9a57eSAndiry Xu /* Check if a port is power on */ 30610ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 30620ed9a57eSAndiry Xu { 30630ed9a57eSAndiry Xu int ret = 0; 30640ed9a57eSAndiry Xu 30650ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 30660ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 30670ed9a57eSAndiry Xu ret = 1; 30680ed9a57eSAndiry Xu } else { 30690ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 30700ed9a57eSAndiry Xu ret = 1; 30710ed9a57eSAndiry Xu } 30720ed9a57eSAndiry Xu 30730ed9a57eSAndiry Xu return ret; 30740ed9a57eSAndiry Xu } 30750ed9a57eSAndiry Xu 30765c79a1e3SDan Williams static void usb_lock_port(struct usb_port *port_dev) 30775c79a1e3SDan Williams __acquires(&port_dev->status_lock) 30785c79a1e3SDan Williams { 30795c79a1e3SDan Williams mutex_lock(&port_dev->status_lock); 30805c79a1e3SDan Williams __acquire(&port_dev->status_lock); 30815c79a1e3SDan Williams } 30825c79a1e3SDan Williams 30835c79a1e3SDan Williams static void usb_unlock_port(struct usb_port *port_dev) 30845c79a1e3SDan Williams __releases(&port_dev->status_lock) 30855c79a1e3SDan Williams { 30865c79a1e3SDan Williams mutex_unlock(&port_dev->status_lock); 30875c79a1e3SDan Williams __release(&port_dev->status_lock); 30885c79a1e3SDan Williams } 30895c79a1e3SDan Williams 3090d388dab7SAlan Stern #ifdef CONFIG_PM 30911da177e4SLinus Torvalds 30920ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 30930ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 30940ed9a57eSAndiry Xu { 30950ed9a57eSAndiry Xu int ret = 0; 30960ed9a57eSAndiry Xu 30970ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 30980ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 30990ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 31000ed9a57eSAndiry Xu ret = 1; 31010ed9a57eSAndiry Xu } else { 31020ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 31030ed9a57eSAndiry Xu ret = 1; 31040ed9a57eSAndiry Xu } 31050ed9a57eSAndiry Xu 31060ed9a57eSAndiry Xu return ret; 31070ed9a57eSAndiry Xu } 3108b01b03f3SAlan Stern 3109b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 3110b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 3111b01b03f3SAlan Stern */ 3112b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 3113b01b03f3SAlan Stern struct usb_hub *hub, int port1, 31147fa40910SJulius Werner int status, u16 portchange, u16 portstatus) 3115b01b03f3SAlan Stern { 3116d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 31177fa40910SJulius Werner int retries = 3; 3118d99f6b41SDan Williams 31197fa40910SJulius Werner retry: 31203cd12f91SDan Williams /* Is a warm reset needed to recover the connection? */ 31213cd12f91SDan Williams if (status == 0 && udev->reset_resume 31223cd12f91SDan Williams && hub_port_warm_reset_required(hub, port1, portstatus)) { 31233cd12f91SDan Williams /* pass */; 31243cd12f91SDan Williams } 3125b01b03f3SAlan Stern /* Is the device still present? */ 31263cd12f91SDan Williams else if (status || port_is_suspended(hub, portstatus) || 31277fa40910SJulius Werner !port_is_power_on(hub, portstatus)) { 3128b01b03f3SAlan Stern if (status >= 0) 3129b01b03f3SAlan Stern status = -ENODEV; 31307fa40910SJulius Werner } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 31317fa40910SJulius Werner if (retries--) { 31327fa40910SJulius Werner usleep_range(200, 300); 31337fa40910SJulius Werner status = hub_port_status(hub, port1, &portstatus, 31347fa40910SJulius Werner &portchange); 31357fa40910SJulius Werner goto retry; 31367fa40910SJulius Werner } 31377fa40910SJulius Werner status = -ENODEV; 3138b01b03f3SAlan Stern } 3139b01b03f3SAlan Stern 314086c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 314186c57edfSAlan Stern * so try a reset-resume instead. 314286c57edfSAlan Stern */ 314386c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 314486c57edfSAlan Stern if (udev->persist_enabled) 314586c57edfSAlan Stern udev->reset_resume = 1; 314686c57edfSAlan Stern else 3147b01b03f3SAlan Stern status = -ENODEV; 314886c57edfSAlan Stern } 3149b01b03f3SAlan Stern 3150b01b03f3SAlan Stern if (status) { 3151d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", 3152d99f6b41SDan Williams portchange, portstatus, status); 3153b01b03f3SAlan Stern } else if (udev->reset_resume) { 3154b01b03f3SAlan Stern 3155b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 3156b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 3157ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3158b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 3159b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 3160ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3161b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 31629f952e26SAlan Stern 31639f952e26SAlan Stern /* 31649f952e26SAlan Stern * Whatever made this reset-resume necessary may have 31659f952e26SAlan Stern * turned on the port1 bit in hub->change_bits. But after 31669f952e26SAlan Stern * a successful reset-resume we want the bit to be clear; 31679f952e26SAlan Stern * if it was on it would indicate that something happened 31689f952e26SAlan Stern * following the reset-resume. 31699f952e26SAlan Stern */ 31709f952e26SAlan Stern clear_bit(port1, hub->change_bits); 3171b01b03f3SAlan Stern } 3172b01b03f3SAlan Stern 3173b01b03f3SAlan Stern return status; 3174b01b03f3SAlan Stern } 3175b01b03f3SAlan Stern 3176f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3177f74631e3SSarah Sharp { 3178f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 3179f74631e3SSarah Sharp 3180f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 3181f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 3182f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 3183f74631e3SSarah Sharp return 0; 3184f74631e3SSarah Sharp 3185f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 3186f74631e3SSarah Sharp * configured. 3187f74631e3SSarah Sharp */ 3188f74631e3SSarah Sharp if (!udev->actconfig) 3189f74631e3SSarah Sharp return 0; 3190f74631e3SSarah Sharp 31911afe33a7SOliver Neukum return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 31921afe33a7SOliver Neukum USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 31931afe33a7SOliver Neukum USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 31941afe33a7SOliver Neukum USB_CTRL_SET_TIMEOUT); 3195f74631e3SSarah Sharp } 3196f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3197f74631e3SSarah Sharp 3198f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 3199f74631e3SSarah Sharp { 3200f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 3201f74631e3SSarah Sharp 3202f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 3203f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 3204f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 3205f74631e3SSarah Sharp return; 3206f74631e3SSarah Sharp 3207f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 3208f74631e3SSarah Sharp * configured. 3209f74631e3SSarah Sharp */ 3210f74631e3SSarah Sharp if (!udev->actconfig) 3211f74631e3SSarah Sharp return; 3212f74631e3SSarah Sharp 32131afe33a7SOliver Neukum usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 32141afe33a7SOliver Neukum USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 32151afe33a7SOliver Neukum USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 32161afe33a7SOliver Neukum USB_CTRL_SET_TIMEOUT); 3217f74631e3SSarah Sharp } 3218f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3219f74631e3SSarah Sharp 322054a3ac0cSLan Tianyu /* 322128e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 322254a3ac0cSLan Tianyu * @udev: target device 322354a3ac0cSLan Tianyu * 322428e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 322528e86165SAlan Stern * 322628e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 322728e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 322828e86165SAlan Stern * association descriptor shows there's more than one function. 322954a3ac0cSLan Tianyu */ 323028e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 323154a3ac0cSLan Tianyu { 323228e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 32331afe33a7SOliver Neukum return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 32341afe33a7SOliver Neukum USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 32351afe33a7SOliver Neukum USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 32361afe33a7SOliver Neukum USB_CTRL_SET_TIMEOUT); 323728e86165SAlan Stern else 32381afe33a7SOliver Neukum return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 32391afe33a7SOliver Neukum USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 324028e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 32411afe33a7SOliver Neukum USB_INTRF_FUNC_SUSPEND_RW | 32421afe33a7SOliver Neukum USB_INTRF_FUNC_SUSPEND_LP, 324328e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 324428e86165SAlan Stern } 324528e86165SAlan Stern 324628e86165SAlan Stern /* 324728e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 324828e86165SAlan Stern * @udev: target device 324928e86165SAlan Stern * 325028e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 325128e86165SAlan Stern * 325228e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 325328e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 325428e86165SAlan Stern * association descriptor shows there's more than one function. 325528e86165SAlan Stern */ 325628e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 325728e86165SAlan Stern { 325828e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 32591afe33a7SOliver Neukum return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 32601afe33a7SOliver Neukum USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 326128e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 326228e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 326328e86165SAlan Stern else 32641afe33a7SOliver Neukum return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 32651afe33a7SOliver Neukum USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 326654a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 326754a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 326854a3ac0cSLan Tianyu } 32691da177e4SLinus Torvalds 3270e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 32717a6127e3SDouglas Anderson unsigned usb_wakeup_enabled_descendants(struct usb_device *udev) 3272e583d9dbSAlan Stern { 3273e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 3274e583d9dbSAlan Stern 3275e583d9dbSAlan Stern return udev->do_remote_wakeup + 3276e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 3277e583d9dbSAlan Stern } 32787a6127e3SDouglas Anderson EXPORT_SYMBOL_GPL(usb_wakeup_enabled_descendants); 3279e583d9dbSAlan Stern 32801da177e4SLinus Torvalds /* 3281140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 3282624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 32835edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 32841da177e4SLinus Torvalds * 32851da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 32861da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 32871da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 3288140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 32891da177e4SLinus Torvalds * to disconnect devices while they are suspended. 32901da177e4SLinus Torvalds * 3291390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 3292390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 3293390a8c34SDavid Brownell * 3294624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 3295624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 3296624d6c07SAlan Stern * All devices below the suspended port are also suspended. 3297624d6c07SAlan Stern * 3298624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 3299624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 3300624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 3301624d6c07SAlan Stern * some cases, this wakes the USB host. 3302624d6c07SAlan Stern * 33031da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 33041da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 33051da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 33061da177e4SLinus Torvalds * 33074956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 33084956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 33094956eccdSAlan Stern * State transitions include: 33104956eccdSAlan Stern * 33114956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 33124956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 33134956eccdSAlan Stern * 33144956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 33154956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 33164956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 331737ebb549SPetr Mladek * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq 33184956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 33194956eccdSAlan Stern * 3320e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 3321e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 33220aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 33230aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 33240aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 33254956eccdSAlan Stern * 33261da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 33271da177e4SLinus Torvalds */ 332865bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 33291da177e4SLinus Torvalds { 3330ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3331ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3332624d6c07SAlan Stern int port1 = udev->portnum; 3333624d6c07SAlan Stern int status; 33340aa2832dSAlan Stern bool really_suspend = true; 33354956eccdSAlan Stern 33365c79a1e3SDan Williams usb_lock_port(port_dev); 33375c79a1e3SDan Williams 3338624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 3339624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 3340624d6c07SAlan Stern * 3341624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 3342624d6c07SAlan Stern * we don't explicitly enable it here. 3343624d6c07SAlan Stern */ 3344624d6c07SAlan Stern if (udev->do_remote_wakeup) { 334528e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 33460c487206SOliver Neukum if (status) { 3347624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 3348624d6c07SAlan Stern status); 33490c487206SOliver Neukum /* bail if autosuspend is requested */ 33505b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 33514fae6f0fSAlan Stern goto err_wakeup; 33520c487206SOliver Neukum } 3353624d6c07SAlan Stern } 3354624d6c07SAlan Stern 335565580b43SAndiry Xu /* disable USB2 hardware LPM */ 33567529b257SKai-Heng Feng usb_disable_usb2_hardware_lpm(udev); 335765580b43SAndiry Xu 3358f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 33591ccc417eSJoe Perches dev_err(&udev->dev, "Failed to disable LTM before suspend\n"); 33604fae6f0fSAlan Stern status = -ENOMEM; 33614fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 33624fae6f0fSAlan Stern goto err_ltm; 3363f74631e3SSarah Sharp } 33648306095fSSarah Sharp 3365624d6c07SAlan Stern /* see 7.1.7.6 */ 3366a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3367c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3368e583d9dbSAlan Stern 33690aa2832dSAlan Stern /* 33700aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 33710aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 33720aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 33730aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3374e583d9dbSAlan Stern * 3375e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3376e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3377e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3378e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 33790aa2832dSAlan Stern */ 33807a6127e3SDouglas Anderson else if (PMSG_IS_AUTO(msg) || usb_wakeup_enabled_descendants(udev) > 0) 3381e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3382e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 33830aa2832dSAlan Stern else { 33840aa2832dSAlan Stern really_suspend = false; 33850aa2832dSAlan Stern status = 0; 33860aa2832dSAlan Stern } 3387624d6c07SAlan Stern if (status) { 3388d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); 3389cbb33004SAlan Stern 3390d590c231SMathias Nyman /* Try to enable USB3 LTM again */ 33914fae6f0fSAlan Stern usb_enable_ltm(udev); 33924fae6f0fSAlan Stern err_ltm: 3393c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 33947529b257SKai-Heng Feng usb_enable_usb2_hardware_lpm(udev); 3395c3e751e4SAndiry Xu 33964fae6f0fSAlan Stern if (udev->do_remote_wakeup) 33974fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 33984fae6f0fSAlan Stern err_wakeup: 33998306095fSSarah Sharp 3400cbb33004SAlan Stern /* System sleep transitions should never fail */ 34015b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3402cbb33004SAlan Stern status = 0; 3403624d6c07SAlan Stern } else { 340430b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 340530b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 340630b1a7a3SAlan Stern udev->do_remote_wakeup); 34070aa2832dSAlan Stern if (really_suspend) { 3408bfd1e910SAlan Stern udev->port_is_suspended = 1; 3409e583d9dbSAlan Stern 3410e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3411624d6c07SAlan Stern msleep(10); 3412624d6c07SAlan Stern } 3413e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 34140aa2832dSAlan Stern } 3415ad493e5eSLan Tianyu 3416d5c3834eSDan Williams if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled 3417d5c3834eSDan Williams && test_and_clear_bit(port1, hub->child_usage_bits)) 3418ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3419ad493e5eSLan Tianyu 3420c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 34215c79a1e3SDan Williams 34225c79a1e3SDan Williams usb_unlock_port(port_dev); 34234956eccdSAlan Stern return status; 34241da177e4SLinus Torvalds } 3425f3f3253dSDavid Brownell 34261da177e4SLinus Torvalds /* 3427390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3428390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 342954515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 34301da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 34311da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 34321da177e4SLinus Torvalds * in the tree that's rooted at this device. 343354515fe5SAlan Stern * 343454515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 343554515fe5SAlan Stern * status check is done. 34361da177e4SLinus Torvalds */ 3437140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 34381da177e4SLinus Torvalds { 343954515fe5SAlan Stern int status = 0; 344007e72b95SOliver Neukum u16 devstatus = 0; 34411da177e4SLinus Torvalds 34421da177e4SLinus Torvalds /* caller owns the udev device lock */ 3443b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3444b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 34451da177e4SLinus Torvalds 34461da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 34471da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 34481da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 344937ebb549SPetr Mladek * during many timeouts, but hub_wq can't suspend until later. 34501da177e4SLinus Torvalds */ 34511da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 34521da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 34531da177e4SLinus Torvalds : USB_STATE_ADDRESS); 34541da177e4SLinus Torvalds 345554515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 345654515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 345754515fe5SAlan Stern * operation is carried out here, after the port has been 345854515fe5SAlan Stern * resumed. 345954515fe5SAlan Stern */ 34601d10255cSAlan Stern if (udev->reset_resume) { 34611d10255cSAlan Stern /* 34621d10255cSAlan Stern * If the device morphs or switches modes when it is reset, 34631d10255cSAlan Stern * we don't want to perform a reset-resume. We'll fail the 34641d10255cSAlan Stern * resume, which will cause a logical disconnect, and then 34651d10255cSAlan Stern * the device will be rediscovered. 34661d10255cSAlan Stern */ 346786c57edfSAlan Stern retry_reset_resume: 34681d10255cSAlan Stern if (udev->quirks & USB_QUIRK_RESET) 34691d10255cSAlan Stern status = -ENODEV; 34701d10255cSAlan Stern else 3471742120c6SMing Lei status = usb_reset_and_verify_device(udev); 34721d10255cSAlan Stern } 347354515fe5SAlan Stern 34741da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 34751da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 34761da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 34771da177e4SLinus Torvalds */ 347854515fe5SAlan Stern if (status == 0) { 347946dede46SAlan Stern devstatus = 0; 3480d9e1e148SFelipe Balbi status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 348186c57edfSAlan Stern 348286c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 348386c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 348486c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 348586c57edfSAlan Stern udev->reset_resume = 1; 348686c57edfSAlan Stern goto retry_reset_resume; 348786c57edfSAlan Stern } 348854515fe5SAlan Stern } 3489b40b7a90SAlan Stern 3490624d6c07SAlan Stern if (status) { 3491624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 34921da177e4SLinus Torvalds status); 349307e72b95SOliver Neukum /* 349407e72b95SOliver Neukum * There are a few quirky devices which violate the standard 349507e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 349607e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 349707e72b95SOliver Neukum * udev->reset_resume 349807e72b95SOliver Neukum */ 349907e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 350028e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 350154a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 350228e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 350354a3ac0cSLan Tianyu } else { 3504d9e1e148SFelipe Balbi status = usb_get_std_status(udev, USB_RECIP_INTERFACE, 0, 350554a3ac0cSLan Tianyu &devstatus); 350654a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 350754a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 350828e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 350954a3ac0cSLan Tianyu } 351054a3ac0cSLan Tianyu 3511a8e7c565SAlan Stern if (status) 3512b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3513b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3514b9cef6c3SWu Fengguang status); 35151da177e4SLinus Torvalds status = 0; 35161da177e4SLinus Torvalds } 35171da177e4SLinus Torvalds return status; 35181da177e4SLinus Torvalds } 35191da177e4SLinus Torvalds 3520624d6c07SAlan Stern /* 3521a40178b2SPratyush Anand * There are some SS USB devices which take longer time for link training. 3522a40178b2SPratyush Anand * XHCI specs 4.19.4 says that when Link training is successful, port 35236b82b122SAl Cooper * sets CCS bit to 1. So if SW reads port status before successful link 3524a40178b2SPratyush Anand * training, then it will not find device to be present. 3525a40178b2SPratyush Anand * USB Analyzer log with such buggy devices show that in some cases 3526a40178b2SPratyush Anand * device switch on the RX termination after long delay of host enabling 3527a40178b2SPratyush Anand * the VBUS. In few other cases it has been seen that device fails to 3528a40178b2SPratyush Anand * negotiate link training in first attempt. It has been 3529a40178b2SPratyush Anand * reported till now that few devices take as long as 2000 ms to train 3530a40178b2SPratyush Anand * the link after host enabling its VBUS and termination. Following 3531a40178b2SPratyush Anand * routine implements a 2000 ms timeout for link training. If in a case 3532a40178b2SPratyush Anand * link trains before timeout, loop will exit earlier. 3533a40178b2SPratyush Anand * 35346b82b122SAl Cooper * There are also some 2.0 hard drive based devices and 3.0 thumb 35356b82b122SAl Cooper * drives that, when plugged into a 2.0 only port, take a long 35366b82b122SAl Cooper * time to set CCS after VBUS enable. 35376b82b122SAl Cooper * 3538a40178b2SPratyush Anand * FIXME: If a device was connected before suspend, but was removed 3539a40178b2SPratyush Anand * while system was asleep, then the loop in the following routine will 3540a40178b2SPratyush Anand * only exit at timeout. 3541a40178b2SPratyush Anand * 35426b82b122SAl Cooper * This routine should only be called when persist is enabled. 3543a40178b2SPratyush Anand */ 35446b82b122SAl Cooper static int wait_for_connected(struct usb_device *udev, 3545a40178b2SPratyush Anand struct usb_hub *hub, int *port1, 3546a40178b2SPratyush Anand u16 *portchange, u16 *portstatus) 3547a40178b2SPratyush Anand { 3548a40178b2SPratyush Anand int status = 0, delay_ms = 0; 3549a40178b2SPratyush Anand 3550a40178b2SPratyush Anand while (delay_ms < 2000) { 3551a40178b2SPratyush Anand if (status || *portstatus & USB_PORT_STAT_CONNECTION) 3552a40178b2SPratyush Anand break; 35535d111f51SDominik Bozek if (!port_is_power_on(hub, *portstatus)) { 35545d111f51SDominik Bozek status = -ENODEV; 35555d111f51SDominik Bozek break; 35565d111f51SDominik Bozek } 3557a40178b2SPratyush Anand msleep(20); 3558a40178b2SPratyush Anand delay_ms += 20; 3559a40178b2SPratyush Anand status = hub_port_status(hub, *port1, portstatus, portchange); 3560a40178b2SPratyush Anand } 35616b82b122SAl Cooper dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); 3562a40178b2SPratyush Anand return status; 3563a40178b2SPratyush Anand } 3564a40178b2SPratyush Anand 3565a40178b2SPratyush Anand /* 3566624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3567624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3568624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3569624d6c07SAlan Stern * 3570624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3571624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3572624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3573624d6c07SAlan Stern * the host and the device is the same as it was when the device 3574624d6c07SAlan Stern * suspended. 3575624d6c07SAlan Stern * 3576feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3577feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 357854515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 357954515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 358054515fe5SAlan Stern * 358154515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 358254515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 358354515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 358454515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 358554515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 358654515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 358754515fe5SAlan Stern * made to appear as if it had not disconnected. 358854515fe5SAlan Stern * 3589742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3590feccc30dSAlan Stern * every effort to insure that the same device is present after the 359154515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 359254515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 359354515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 359454515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 359554515fe5SAlan Stern * new card is corrupted and the system crashes. 359654515fe5SAlan Stern * 3597624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3598624d6c07SAlan Stern */ 359965bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 36001da177e4SLinus Torvalds { 3601ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3602ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3603624d6c07SAlan Stern int port1 = udev->portnum; 36041da177e4SLinus Torvalds int status; 3605d25450c6SAlan Stern u16 portchange, portstatus; 3606d25450c6SAlan Stern 3607d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) { 3608ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3609ad493e5eSLan Tianyu if (status < 0) { 3610ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3611ad493e5eSLan Tianyu status); 3612ad493e5eSLan Tianyu return status; 3613ad493e5eSLan Tianyu } 3614ad493e5eSLan Tianyu } 3615ad493e5eSLan Tianyu 36165c79a1e3SDan Williams usb_lock_port(port_dev); 36175c79a1e3SDan Williams 3618d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3619d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 362083a62c51SRavi Chandra Sadineni if (status == 0 && !port_is_suspended(hub, portstatus)) { 362183a62c51SRavi Chandra Sadineni if (portchange & USB_PORT_STAT_C_SUSPEND) 362283a62c51SRavi Chandra Sadineni pm_wakeup_event(&udev->dev, 0); 3623d25450c6SAlan Stern goto SuspendCleared; 362483a62c51SRavi Chandra Sadineni } 36251da177e4SLinus Torvalds 36261da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3627a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3628c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3629a7114230SAndiry Xu else 3630ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 36311da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 36321da177e4SLinus Torvalds if (status) { 3633d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); 36341da177e4SLinus Torvalds } else { 3635bbc78c07SFelipe Balbi /* drive resume for USB_RESUME_TIMEOUT msec */ 3636645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 36375b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 3638bbc78c07SFelipe Balbi msleep(USB_RESUME_TIMEOUT); 36391da177e4SLinus Torvalds 36401da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 36411da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 36421da177e4SLinus Torvalds * sequence. 36431da177e4SLinus Torvalds */ 3644d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 364554515fe5SAlan Stern 36461da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 36471da177e4SLinus Torvalds msleep(10); 36481da177e4SLinus Torvalds } 3649b01b03f3SAlan Stern 3650b01b03f3SAlan Stern SuspendCleared: 3651b01b03f3SAlan Stern if (status == 0) { 3652bfd1e910SAlan Stern udev->port_is_suspended = 0; 3653a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3654a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3655ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3656a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3657a7114230SAndiry Xu } else { 3658b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3659ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3660b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 36611da177e4SLinus Torvalds } 3662a7114230SAndiry Xu } 36631da177e4SLinus Torvalds 36646b82b122SAl Cooper if (udev->persist_enabled) 36656b82b122SAl Cooper status = wait_for_connected(udev, hub, &port1, &portchange, 3666a40178b2SPratyush Anand &portstatus); 3667a40178b2SPratyush Anand 3668b01b03f3SAlan Stern status = check_port_resume_type(udev, 3669b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 367054515fe5SAlan Stern if (status == 0) 367154515fe5SAlan Stern status = finish_port_resume(udev); 367254515fe5SAlan Stern if (status < 0) { 367354515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 367454515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 367565580b43SAndiry Xu } else { 367665580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 36777529b257SKai-Heng Feng usb_enable_usb2_hardware_lpm(udev); 36788306095fSSarah Sharp 3679d590c231SMathias Nyman /* Try to enable USB3 LTM */ 3680f74631e3SSarah Sharp usb_enable_ltm(udev); 368154515fe5SAlan Stern } 368265580b43SAndiry Xu 36835c79a1e3SDan Williams usb_unlock_port(port_dev); 36845c79a1e3SDan Williams 36851da177e4SLinus Torvalds return status; 36861da177e4SLinus Torvalds } 36871da177e4SLinus Torvalds 36880534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 36891da177e4SLinus Torvalds { 36901da177e4SLinus Torvalds int status = 0; 36911da177e4SLinus Torvalds 36925c79a1e3SDan Williams usb_lock_device(udev); 36931da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3694645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 36959bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 36969bbdf1e0SAlan Stern if (status == 0) { 36979bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 36989bbdf1e0SAlan Stern usb_autosuspend_device(udev); 36999bbdf1e0SAlan Stern } 3700d25450c6SAlan Stern } 37015c79a1e3SDan Williams usb_unlock_device(udev); 37021da177e4SLinus Torvalds return status; 37031da177e4SLinus Torvalds } 37041da177e4SLinus Torvalds 37057e73be22SDan Williams /* Returns 1 if there was a remote wakeup and a connect status change. */ 37067e73be22SDan Williams static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 37077e73be22SDan Williams u16 portstatus, u16 portchange) 37087e73be22SDan Williams __must_hold(&port_dev->status_lock) 37097e73be22SDan Williams { 37107e73be22SDan Williams struct usb_port *port_dev = hub->ports[port - 1]; 37117e73be22SDan Williams struct usb_device *hdev; 37127e73be22SDan Williams struct usb_device *udev; 37137e73be22SDan Williams int connect_change = 0; 3714e244c469SLee, Chiasheng u16 link_state; 37157e73be22SDan Williams int ret; 37167e73be22SDan Williams 37177e73be22SDan Williams hdev = hub->hdev; 37187e73be22SDan Williams udev = port_dev->child; 37197e73be22SDan Williams if (!hub_is_superspeed(hdev)) { 37207e73be22SDan Williams if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 37217e73be22SDan Williams return 0; 37227e73be22SDan Williams usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 37237e73be22SDan Williams } else { 3724e244c469SLee, Chiasheng link_state = portstatus & USB_PORT_STAT_LINK_STATE; 37257e73be22SDan Williams if (!udev || udev->state != USB_STATE_SUSPENDED || 3726e244c469SLee, Chiasheng (link_state != USB_SS_PORT_LS_U0 && 3727e244c469SLee, Chiasheng link_state != USB_SS_PORT_LS_U1 && 3728e244c469SLee, Chiasheng link_state != USB_SS_PORT_LS_U2)) 37297e73be22SDan Williams return 0; 37307e73be22SDan Williams } 37317e73be22SDan Williams 37327e73be22SDan Williams if (udev) { 37337e73be22SDan Williams /* TRSMRCY = 10 msec */ 37347e73be22SDan Williams msleep(10); 37357e73be22SDan Williams 37367e73be22SDan Williams usb_unlock_port(port_dev); 37377e73be22SDan Williams ret = usb_remote_wakeup(udev); 37387e73be22SDan Williams usb_lock_port(port_dev); 37397e73be22SDan Williams if (ret < 0) 37407e73be22SDan Williams connect_change = 1; 37417e73be22SDan Williams } else { 37427e73be22SDan Williams ret = -ENODEV; 37437e73be22SDan Williams hub_port_disable(hub, port, 1); 37447e73be22SDan Williams } 37457e73be22SDan Williams dev_dbg(&port_dev->dev, "resume, status %d\n", ret); 37467e73be22SDan Williams return connect_change; 37477e73be22SDan Williams } 37487e73be22SDan Williams 3749e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3750e6f30deaSMing Lei { 3751e6f30deaSMing Lei int port1; 3752e6f30deaSMing Lei 3753e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3754e6f30deaSMing Lei u16 portstatus, portchange; 3755e6f30deaSMing Lei int status; 3756e6f30deaSMing Lei 3757e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3758e6f30deaSMing Lei if (!status && portchange) 3759e6f30deaSMing Lei return 1; 3760e6f30deaSMing Lei } 3761e6f30deaSMing Lei return 0; 3762e6f30deaSMing Lei } 3763e6f30deaSMing Lei 3764db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 37651da177e4SLinus Torvalds { 37661da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 37671da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 37681da177e4SLinus Torvalds unsigned port1; 37691da177e4SLinus Torvalds 3770e583d9dbSAlan Stern /* 3771e583d9dbSAlan Stern * Warn if children aren't already suspended. 3772e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3773e583d9dbSAlan Stern */ 3774e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 37751da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 3776d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 3777d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 37781da177e4SLinus Torvalds 37796840d255SAlan Stern if (udev && udev->can_submit) { 3780b658b8f5SDan Williams dev_warn(&port_dev->dev, "device %s not suspended yet\n", 3781b658b8f5SDan Williams dev_name(&udev->dev)); 37825b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3783c9f89fa4SDavid Brownell return -EBUSY; 3784c9f89fa4SDavid Brownell } 3785e583d9dbSAlan Stern if (udev) 3786e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 37877a6127e3SDouglas Anderson usb_wakeup_enabled_descendants(udev); 37881da177e4SLinus Torvalds } 3789e6f30deaSMing Lei 3790e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3791e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3792e6f30deaSMing Lei if (check_ports_changed(hub)) { 3793e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3794e6f30deaSMing Lei return -EBUSY; 3795e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3796e6f30deaSMing Lei } 3797e6f30deaSMing Lei } 3798e6f30deaSMing Lei 37994296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 38004296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 38014296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 38023bee346bSMathieu Malaterre set_port_feature(hdev, 38034296c70aSSarah Sharp port1 | 38044296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 38054296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 38064296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 38074296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 38084296c70aSSarah Sharp } 38094296c70aSSarah Sharp } 38101da177e4SLinus Torvalds 3811441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 381240f122f3SAlan Stern 381337ebb549SPetr Mladek /* stop hub_wq and related activity */ 38144330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3815b6f6436dSAlan Stern return 0; 38161da177e4SLinus Torvalds } 38171da177e4SLinus Torvalds 3818379cacc5SAlan Stern /* Report wakeup requests from the ports of a resuming root hub */ 3819379cacc5SAlan Stern static void report_wakeup_requests(struct usb_hub *hub) 3820379cacc5SAlan Stern { 3821379cacc5SAlan Stern struct usb_device *hdev = hub->hdev; 3822379cacc5SAlan Stern struct usb_device *udev; 3823379cacc5SAlan Stern struct usb_hcd *hcd; 3824379cacc5SAlan Stern unsigned long resuming_ports; 3825379cacc5SAlan Stern int i; 3826379cacc5SAlan Stern 3827379cacc5SAlan Stern if (hdev->parent) 3828379cacc5SAlan Stern return; /* Not a root hub */ 3829379cacc5SAlan Stern 3830379cacc5SAlan Stern hcd = bus_to_hcd(hdev->bus); 3831379cacc5SAlan Stern if (hcd->driver->get_resuming_ports) { 3832379cacc5SAlan Stern 3833379cacc5SAlan Stern /* 3834379cacc5SAlan Stern * The get_resuming_ports() method returns a bitmap (origin 0) 3835379cacc5SAlan Stern * of ports which have started wakeup signaling but have not 3836379cacc5SAlan Stern * yet finished resuming. During system resume we will 3837379cacc5SAlan Stern * resume all the enabled ports, regardless of any wakeup 3838379cacc5SAlan Stern * signals, which means the wakeup requests would be lost. 3839379cacc5SAlan Stern * To prevent this, report them to the PM core here. 3840379cacc5SAlan Stern */ 3841379cacc5SAlan Stern resuming_ports = hcd->driver->get_resuming_ports(hcd); 3842379cacc5SAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 3843379cacc5SAlan Stern if (test_bit(i, &resuming_ports)) { 3844379cacc5SAlan Stern udev = hub->ports[i]->child; 3845379cacc5SAlan Stern if (udev) 3846379cacc5SAlan Stern pm_wakeup_event(&udev->dev, 0); 3847379cacc5SAlan Stern } 3848379cacc5SAlan Stern } 3849379cacc5SAlan Stern } 3850379cacc5SAlan Stern } 3851379cacc5SAlan Stern 38521da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 38531da177e4SLinus Torvalds { 38541da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 38551da177e4SLinus Torvalds 38565e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3857f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 3858379cacc5SAlan Stern 3859379cacc5SAlan Stern /* 3860379cacc5SAlan Stern * This should be called only for system resume, not runtime resume. 3861379cacc5SAlan Stern * We can't tell the difference here, so some wakeup requests will be 3862379cacc5SAlan Stern * reported at the wrong time or more than once. This shouldn't 3863379cacc5SAlan Stern * matter much, so long as they do get reported. 3864379cacc5SAlan Stern */ 3865379cacc5SAlan Stern report_wakeup_requests(hub); 38661da177e4SLinus Torvalds return 0; 38671da177e4SLinus Torvalds } 38681da177e4SLinus Torvalds 3869b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3870f07600cfSAlan Stern { 3871b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3872f07600cfSAlan Stern 38735e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3874f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3875f07600cfSAlan Stern return 0; 3876f07600cfSAlan Stern } 3877f07600cfSAlan Stern 387854515fe5SAlan Stern /** 387954515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 388054515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 388154515fe5SAlan Stern * 388254515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 388354515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3884feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3885feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3886feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3887feccc30dSAlan Stern * the others will be disconnected. 388854515fe5SAlan Stern */ 388954515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 389054515fe5SAlan Stern { 38910442d7b0STomeu Vizoso dev_notice(&rhdev->dev, "root hub lost power or was reset\n"); 389254515fe5SAlan Stern rhdev->reset_resume = 1; 389354515fe5SAlan Stern } 389454515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 389554515fe5SAlan Stern 38961ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 38971ea7e0e8SSarah Sharp "U0", 38981ea7e0e8SSarah Sharp "U1", 38991ea7e0e8SSarah Sharp "U2", 39001ea7e0e8SSarah Sharp "U3", 39011ea7e0e8SSarah Sharp }; 39021ea7e0e8SSarah Sharp 39031ea7e0e8SSarah Sharp /* 39041ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 39051ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 39061ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 39071ea7e0e8SSarah Sharp * packet from the host. 39081ea7e0e8SSarah Sharp * 39091ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 39101ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 39111ea7e0e8SSarah Sharp */ 39121ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 39131ea7e0e8SSarah Sharp { 39141ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 39151ea7e0e8SSarah Sharp unsigned long long u1_sel; 39161ea7e0e8SSarah Sharp unsigned long long u1_pel; 39171ea7e0e8SSarah Sharp unsigned long long u2_sel; 39181ea7e0e8SSarah Sharp unsigned long long u2_pel; 39191ea7e0e8SSarah Sharp int ret; 39201ea7e0e8SSarah Sharp 392138d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 392238d7f688SXenia Ragiadakou return 0; 392338d7f688SXenia Ragiadakou 39241ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 39251ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 39261ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 39271ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 39281ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 39291ea7e0e8SSarah Sharp 39301ea7e0e8SSarah Sharp /* 39311ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 39321ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 39331ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 39341ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 39351ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 39361ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 39371ea7e0e8SSarah Sharp */ 39381ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 39391ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 39401ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 39411ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 39421ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 39431ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 39441510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 39451ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 39461ea7e0e8SSarah Sharp return -EINVAL; 39471ea7e0e8SSarah Sharp } 39481ea7e0e8SSarah Sharp 39491ea7e0e8SSarah Sharp /* 39501ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 39511ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 39521ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 39531ea7e0e8SSarah Sharp */ 39541ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 39551ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 39561ea7e0e8SSarah Sharp 39571ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 39581ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 39591ea7e0e8SSarah Sharp 39601ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 39611ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 39621ea7e0e8SSarah Sharp 39631ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 39641ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 39651ea7e0e8SSarah Sharp 39661ea7e0e8SSarah Sharp /* 39671ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 39681ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 39691ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 39701ea7e0e8SSarah Sharp */ 39711ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 39721ea7e0e8SSarah Sharp if (!sel_values) 39731ea7e0e8SSarah Sharp return -ENOMEM; 39741ea7e0e8SSarah Sharp 39751ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 39761ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 39771ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 39781ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 39791ea7e0e8SSarah Sharp 39801ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 39811ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 39821ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 39831ea7e0e8SSarah Sharp 0, 0, 39841ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 39851ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 39861ea7e0e8SSarah Sharp kfree(sel_values); 39871ea7e0e8SSarah Sharp return ret; 39881ea7e0e8SSarah Sharp } 39891ea7e0e8SSarah Sharp 39901ea7e0e8SSarah Sharp /* 39911ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 39921ea7e0e8SSarah Sharp */ 39931ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 39941ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 39951ea7e0e8SSarah Sharp { 39961ea7e0e8SSarah Sharp int ret; 39971ea7e0e8SSarah Sharp int feature; 39981ea7e0e8SSarah Sharp 39991ea7e0e8SSarah Sharp switch (state) { 40001ea7e0e8SSarah Sharp case USB3_LPM_U1: 40011ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 40021ea7e0e8SSarah Sharp break; 40031ea7e0e8SSarah Sharp case USB3_LPM_U2: 40041ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 40051ea7e0e8SSarah Sharp break; 40061ea7e0e8SSarah Sharp default: 40071ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 40081ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 40091ea7e0e8SSarah Sharp return -EINVAL; 40101ea7e0e8SSarah Sharp } 40111ea7e0e8SSarah Sharp 40121ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 40131ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 40141ea7e0e8SSarah Sharp "for unconfigured device.\n", 40151ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 40161ea7e0e8SSarah Sharp usb3_lpm_names[state]); 40171ea7e0e8SSarah Sharp return 0; 40181ea7e0e8SSarah Sharp } 40191ea7e0e8SSarah Sharp 40201ea7e0e8SSarah Sharp if (enable) { 40211ea7e0e8SSarah Sharp /* 40221ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 40231ea7e0e8SSarah Sharp * for either U1 or U2. 40241ea7e0e8SSarah Sharp */ 40251ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 40261ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 40271ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 40281ea7e0e8SSarah Sharp feature, 40291ea7e0e8SSarah Sharp 0, NULL, 0, 40301ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 40311ea7e0e8SSarah Sharp } else { 40321ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 40331ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 40341ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 40351ea7e0e8SSarah Sharp feature, 40361ea7e0e8SSarah Sharp 0, NULL, 0, 40371ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 40381ea7e0e8SSarah Sharp } 40391ea7e0e8SSarah Sharp if (ret < 0) { 40401ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 40411ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 40421ea7e0e8SSarah Sharp usb3_lpm_names[state]); 40431ea7e0e8SSarah Sharp return -EBUSY; 40441ea7e0e8SSarah Sharp } 40451ea7e0e8SSarah Sharp return 0; 40461ea7e0e8SSarah Sharp } 40471ea7e0e8SSarah Sharp 40481ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 40491ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 40501ea7e0e8SSarah Sharp { 40511ea7e0e8SSarah Sharp int ret; 40521ea7e0e8SSarah Sharp int feature; 40531ea7e0e8SSarah Sharp 40541ea7e0e8SSarah Sharp switch (state) { 40551ea7e0e8SSarah Sharp case USB3_LPM_U1: 40561ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 40571ea7e0e8SSarah Sharp break; 40581ea7e0e8SSarah Sharp case USB3_LPM_U2: 40591ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 40601ea7e0e8SSarah Sharp break; 40611ea7e0e8SSarah Sharp default: 40621ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 40631ea7e0e8SSarah Sharp __func__); 40641ea7e0e8SSarah Sharp return -EINVAL; 40651ea7e0e8SSarah Sharp } 40661ea7e0e8SSarah Sharp 40671ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 40681ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 40691ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 40701ea7e0e8SSarah Sharp "which is a reserved value.\n", 40711ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 40721ea7e0e8SSarah Sharp return -EINVAL; 40731ea7e0e8SSarah Sharp } 40741ea7e0e8SSarah Sharp 40751ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 40761ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 40771ea7e0e8SSarah Sharp feature); 40781ea7e0e8SSarah Sharp if (ret < 0) { 40791ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 40801ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 40811ea7e0e8SSarah Sharp timeout, ret); 40821ea7e0e8SSarah Sharp return -EBUSY; 40831ea7e0e8SSarah Sharp } 40841ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 40851ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 40861ea7e0e8SSarah Sharp else 40871ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 40881ea7e0e8SSarah Sharp return 0; 40891ea7e0e8SSarah Sharp } 40901ea7e0e8SSarah Sharp 40911ea7e0e8SSarah Sharp /* 40921ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 40931ea7e0e8SSarah Sharp * U1/U2 entry. 40941ea7e0e8SSarah Sharp * 40951ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 40961ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 40971ea7e0e8SSarah Sharp * will be successful. 40981ea7e0e8SSarah Sharp * 409956175929SThinh Nguyen * If the control transfer to enable device-initiated U1/U2 entry fails, then 410056175929SThinh Nguyen * hub-initiated U1/U2 will be disabled. 410156175929SThinh Nguyen * 41021ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 41031ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 41041ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 41051ea7e0e8SSarah Sharp */ 41061ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 41071ea7e0e8SSarah Sharp enum usb3_link_state state) 41081ea7e0e8SSarah Sharp { 410965a95b75SSarah Sharp int timeout, ret; 4110ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 4111ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 4112ae8963adSSarah Sharp 4113ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 4114ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 4115ae8963adSSarah Sharp * state. 4116ae8963adSSarah Sharp */ 4117ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 4118ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 4119ae8963adSSarah Sharp return; 41201ea7e0e8SSarah Sharp 412165a95b75SSarah Sharp /* 412265a95b75SSarah Sharp * First, let the device know about the exit latencies 412365a95b75SSarah Sharp * associated with the link state we're about to enable. 412465a95b75SSarah Sharp */ 412565a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 412665a95b75SSarah Sharp if (ret < 0) { 412765a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 412865a95b75SSarah Sharp usb3_lpm_names[state]); 412965a95b75SSarah Sharp return; 413065a95b75SSarah Sharp } 413165a95b75SSarah Sharp 41321ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 41331ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 41341ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 41351ea7e0e8SSarah Sharp * link state. 41361ea7e0e8SSarah Sharp */ 41371ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 41381ea7e0e8SSarah Sharp 41391ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 41401ea7e0e8SSarah Sharp if (timeout == 0) 41411ea7e0e8SSarah Sharp return; 41421ea7e0e8SSarah Sharp 41431ea7e0e8SSarah Sharp if (timeout < 0) { 41441ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 41451ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 41461ea7e0e8SSarah Sharp timeout); 41471ea7e0e8SSarah Sharp return; 41481ea7e0e8SSarah Sharp } 41491ea7e0e8SSarah Sharp 4150bf5ce5bfSLu Baolu if (usb_set_lpm_timeout(udev, state, timeout)) { 41511ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 41521ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 41531ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 41541ea7e0e8SSarah Sharp */ 41551ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 415656175929SThinh Nguyen return; 415756175929SThinh Nguyen } 415856175929SThinh Nguyen 4159bf5ce5bfSLu Baolu /* Only a configured device will accept the Set Feature 4160bf5ce5bfSLu Baolu * U1/U2_ENABLE 4161bf5ce5bfSLu Baolu */ 416256175929SThinh Nguyen if (udev->actconfig && 416356175929SThinh Nguyen usb_set_device_initiated_lpm(udev, state, true) == 0) { 4164bf5ce5bfSLu Baolu if (state == USB3_LPM_U1) 4165bf5ce5bfSLu Baolu udev->usb3_lpm_u1_enabled = 1; 4166bf5ce5bfSLu Baolu else if (state == USB3_LPM_U2) 4167bf5ce5bfSLu Baolu udev->usb3_lpm_u2_enabled = 1; 416856175929SThinh Nguyen } else { 416956175929SThinh Nguyen /* Don't request U1/U2 entry if the device 417056175929SThinh Nguyen * cannot transition to U1/U2. 417156175929SThinh Nguyen */ 417256175929SThinh Nguyen usb_set_lpm_timeout(udev, state, 0); 417356175929SThinh Nguyen hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 4174bf5ce5bfSLu Baolu } 41751ea7e0e8SSarah Sharp } 41761ea7e0e8SSarah Sharp 41771ea7e0e8SSarah Sharp /* 41781ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 41791ea7e0e8SSarah Sharp * U1/U2 entry. 41801ea7e0e8SSarah Sharp * 41811ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 41821ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 41831ea7e0e8SSarah Sharp * 41841ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 41851ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 41861ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 41871ea7e0e8SSarah Sharp * 41881ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 41891ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 41901ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 41911ea7e0e8SSarah Sharp */ 41921ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 41931ea7e0e8SSarah Sharp enum usb3_link_state state) 41941ea7e0e8SSarah Sharp { 41951ea7e0e8SSarah Sharp switch (state) { 41961ea7e0e8SSarah Sharp case USB3_LPM_U1: 41971ea7e0e8SSarah Sharp case USB3_LPM_U2: 41981ea7e0e8SSarah Sharp break; 41991ea7e0e8SSarah Sharp default: 42001ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 42011ea7e0e8SSarah Sharp __func__); 42021ea7e0e8SSarah Sharp return -EINVAL; 42031ea7e0e8SSarah Sharp } 42041ea7e0e8SSarah Sharp 42051ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 42061ea7e0e8SSarah Sharp return -EBUSY; 42071ea7e0e8SSarah Sharp 42081ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 42091ea7e0e8SSarah Sharp 42101ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 42111ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 42121ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 42131ea7e0e8SSarah Sharp usb3_lpm_names[state]); 4214bf5ce5bfSLu Baolu 4215bf5ce5bfSLu Baolu /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM 4216bf5ce5bfSLu Baolu * is disabled. Hub will disallows link to enter U1/U2 as well, 4217bf5ce5bfSLu Baolu * even device is initiating LPM. Hence LPM is disabled if hub LPM 4218bf5ce5bfSLu Baolu * timeout set to 0, no matter device-initiated LPM is disabled or 4219bf5ce5bfSLu Baolu * not. 4220bf5ce5bfSLu Baolu */ 4221bf5ce5bfSLu Baolu if (state == USB3_LPM_U1) 4222bf5ce5bfSLu Baolu udev->usb3_lpm_u1_enabled = 0; 4223bf5ce5bfSLu Baolu else if (state == USB3_LPM_U2) 4224bf5ce5bfSLu Baolu udev->usb3_lpm_u2_enabled = 0; 4225bf5ce5bfSLu Baolu 42261ea7e0e8SSarah Sharp return 0; 42271ea7e0e8SSarah Sharp } 42281ea7e0e8SSarah Sharp 42291ea7e0e8SSarah Sharp /* 42301ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 42311ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 42321ea7e0e8SSarah Sharp * 42331ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 42341ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 42351ea7e0e8SSarah Sharp */ 42361ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 42371ea7e0e8SSarah Sharp { 42381ea7e0e8SSarah Sharp struct usb_hcd *hcd; 42391ea7e0e8SSarah Sharp 42401ea7e0e8SSarah Sharp if (!udev || !udev->parent || 42418a1b2725SMathias Nyman udev->speed < USB_SPEED_SUPER || 424251df62ffSPratyush Anand !udev->lpm_capable || 4243fea3af5eSThinh Nguyen udev->state < USB_STATE_CONFIGURED) 42441ea7e0e8SSarah Sharp return 0; 42451ea7e0e8SSarah Sharp 42461ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 42471ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 42481ea7e0e8SSarah Sharp return 0; 42491ea7e0e8SSarah Sharp 42501ea7e0e8SSarah Sharp udev->lpm_disable_count++; 425155558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 42521ea7e0e8SSarah Sharp return 0; 42531ea7e0e8SSarah Sharp 42541ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 42551ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 42561ea7e0e8SSarah Sharp goto enable_lpm; 42571ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 42581ea7e0e8SSarah Sharp goto enable_lpm; 42591ea7e0e8SSarah Sharp 42601ea7e0e8SSarah Sharp return 0; 42611ea7e0e8SSarah Sharp 42621ea7e0e8SSarah Sharp enable_lpm: 42631ea7e0e8SSarah Sharp usb_enable_lpm(udev); 42641ea7e0e8SSarah Sharp return -EBUSY; 42651ea7e0e8SSarah Sharp } 42661ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 42671ea7e0e8SSarah Sharp 42681ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 42691ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 42701ea7e0e8SSarah Sharp { 42711ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 42721ea7e0e8SSarah Sharp int ret; 42731ea7e0e8SSarah Sharp 42741ea7e0e8SSarah Sharp if (!hcd) 42751ea7e0e8SSarah Sharp return -EINVAL; 42761ea7e0e8SSarah Sharp 42771ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 42781ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 42791ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 42801ea7e0e8SSarah Sharp 42811ea7e0e8SSarah Sharp return ret; 42821ea7e0e8SSarah Sharp } 42831ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 42841ea7e0e8SSarah Sharp 42851ea7e0e8SSarah Sharp /* 42861ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 42871ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 42881ea7e0e8SSarah Sharp * 42891ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 42901ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 42911ea7e0e8SSarah Sharp * bandwidth_mutex. 42921ea7e0e8SSarah Sharp */ 42931ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 42941ea7e0e8SSarah Sharp { 42951ea7e0e8SSarah Sharp struct usb_hcd *hcd; 4296513072d9SLu Baolu struct usb_hub *hub; 4297513072d9SLu Baolu struct usb_port *port_dev; 42981ea7e0e8SSarah Sharp 42991ea7e0e8SSarah Sharp if (!udev || !udev->parent || 43008a1b2725SMathias Nyman udev->speed < USB_SPEED_SUPER || 430151df62ffSPratyush Anand !udev->lpm_capable || 4302fea3af5eSThinh Nguyen udev->state < USB_STATE_CONFIGURED) 43031ea7e0e8SSarah Sharp return; 43041ea7e0e8SSarah Sharp 43051ea7e0e8SSarah Sharp udev->lpm_disable_count--; 43061ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 43071ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 43081ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 43091ea7e0e8SSarah Sharp */ 43101ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 43111ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 43121ea7e0e8SSarah Sharp return; 43131ea7e0e8SSarah Sharp 43141ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 43151ea7e0e8SSarah Sharp return; 43161ea7e0e8SSarah Sharp 4317513072d9SLu Baolu hub = usb_hub_to_struct_hub(udev->parent); 4318513072d9SLu Baolu if (!hub) 4319513072d9SLu Baolu return; 4320513072d9SLu Baolu 4321513072d9SLu Baolu port_dev = hub->ports[udev->portnum - 1]; 4322513072d9SLu Baolu 4323513072d9SLu Baolu if (port_dev->usb3_lpm_u1_permit) 43241ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 4325513072d9SLu Baolu 4326513072d9SLu Baolu if (port_dev->usb3_lpm_u2_permit) 43271ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 43281ea7e0e8SSarah Sharp } 43291ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 43301ea7e0e8SSarah Sharp 43311ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 43321ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 43331ea7e0e8SSarah Sharp { 43341ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 43351ea7e0e8SSarah Sharp 43361ea7e0e8SSarah Sharp if (!hcd) 43371ea7e0e8SSarah Sharp return; 43381ea7e0e8SSarah Sharp 43391ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 43401ea7e0e8SSarah Sharp usb_enable_lpm(udev); 43411ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 43421ea7e0e8SSarah Sharp } 43431ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 43441ea7e0e8SSarah Sharp 434537be6676SMathias Nyman /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */ 434637be6676SMathias Nyman static void hub_usb3_port_prepare_disable(struct usb_hub *hub, 434737be6676SMathias Nyman struct usb_port *port_dev) 434837be6676SMathias Nyman { 434937be6676SMathias Nyman struct usb_device *udev = port_dev->child; 435037be6676SMathias Nyman int ret; 435137be6676SMathias Nyman 435237be6676SMathias Nyman if (udev && udev->port_is_suspended && udev->do_remote_wakeup) { 435337be6676SMathias Nyman ret = hub_set_port_link_state(hub, port_dev->portnum, 435437be6676SMathias Nyman USB_SS_PORT_LS_U0); 435537be6676SMathias Nyman if (!ret) { 435637be6676SMathias Nyman msleep(USB_RESUME_TIMEOUT); 435737be6676SMathias Nyman ret = usb_disable_remote_wakeup(udev); 435837be6676SMathias Nyman } 435937be6676SMathias Nyman if (ret) 436037be6676SMathias Nyman dev_warn(&udev->dev, 436137be6676SMathias Nyman "Port disable: can't disable remote wake\n"); 436237be6676SMathias Nyman udev->do_remote_wakeup = 0; 436337be6676SMathias Nyman } 436437be6676SMathias Nyman } 43651ea7e0e8SSarah Sharp 4366d388dab7SAlan Stern #else /* CONFIG_PM */ 4367d388dab7SAlan Stern 4368511366daSAndrew Morton #define hub_suspend NULL 4369511366daSAndrew Morton #define hub_resume NULL 4370f07600cfSAlan Stern #define hub_reset_resume NULL 43711ea7e0e8SSarah Sharp 437237be6676SMathias Nyman static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub, 437337be6676SMathias Nyman struct usb_port *port_dev) { } 437437be6676SMathias Nyman 43751ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 43761ea7e0e8SSarah Sharp { 43771ea7e0e8SSarah Sharp return 0; 43781ea7e0e8SSarah Sharp } 4379e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 43801ea7e0e8SSarah Sharp 43811ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 4382e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 43831ea7e0e8SSarah Sharp 43841ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 43851ea7e0e8SSarah Sharp { 43861ea7e0e8SSarah Sharp return 0; 43871ea7e0e8SSarah Sharp } 4388e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 43891ea7e0e8SSarah Sharp 43901ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 4391e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 4392f74631e3SSarah Sharp 4393f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 4394f74631e3SSarah Sharp { 4395f74631e3SSarah Sharp return 0; 4396f74631e3SSarah Sharp } 4397f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 4398f74631e3SSarah Sharp 4399f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 4400f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 4401c4b51a43SAlan Stern 44024a95b1fcSStephen Rothwell static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 44034a95b1fcSStephen Rothwell u16 portstatus, u16 portchange) 44044a95b1fcSStephen Rothwell { 44054a95b1fcSStephen Rothwell return 0; 44064a95b1fcSStephen Rothwell } 44074a95b1fcSStephen Rothwell 4408c4b51a43SAlan Stern #endif /* CONFIG_PM */ 4409d388dab7SAlan Stern 44103bc02bceSGeert Uytterhoeven /* 44113bc02bceSGeert Uytterhoeven * USB-3 does not have a similar link state as USB-2 that will avoid negotiating 44123bc02bceSGeert Uytterhoeven * a connection with a plugged-in cable but will signal the host when the cable 44133bc02bceSGeert Uytterhoeven * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices 44143bc02bceSGeert Uytterhoeven */ 44153bc02bceSGeert Uytterhoeven static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 44163bc02bceSGeert Uytterhoeven { 44173bc02bceSGeert Uytterhoeven struct usb_port *port_dev = hub->ports[port1 - 1]; 44183bc02bceSGeert Uytterhoeven struct usb_device *hdev = hub->hdev; 44193bc02bceSGeert Uytterhoeven int ret = 0; 44203bc02bceSGeert Uytterhoeven 44213bc02bceSGeert Uytterhoeven if (!hub->error) { 44223bc02bceSGeert Uytterhoeven if (hub_is_superspeed(hub->hdev)) { 44233bc02bceSGeert Uytterhoeven hub_usb3_port_prepare_disable(hub, port_dev); 44243bc02bceSGeert Uytterhoeven ret = hub_set_port_link_state(hub, port_dev->portnum, 44253bc02bceSGeert Uytterhoeven USB_SS_PORT_LS_U3); 44263bc02bceSGeert Uytterhoeven } else { 44273bc02bceSGeert Uytterhoeven ret = usb_clear_port_feature(hdev, port1, 44283bc02bceSGeert Uytterhoeven USB_PORT_FEAT_ENABLE); 44293bc02bceSGeert Uytterhoeven } 44303bc02bceSGeert Uytterhoeven } 44313bc02bceSGeert Uytterhoeven if (port_dev->child && set_state) 44323bc02bceSGeert Uytterhoeven usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); 44333bc02bceSGeert Uytterhoeven if (ret && ret != -ENODEV) 44343bc02bceSGeert Uytterhoeven dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); 44353bc02bceSGeert Uytterhoeven return ret; 44363bc02bceSGeert Uytterhoeven } 44373bc02bceSGeert Uytterhoeven 44388dd8d2c9SDaniel Drake /* 44398dd8d2c9SDaniel Drake * usb_port_disable - disable a usb device's upstream port 44408dd8d2c9SDaniel Drake * @udev: device to disable 44418dd8d2c9SDaniel Drake * Context: @udev locked, must be able to sleep. 44428dd8d2c9SDaniel Drake * 44438dd8d2c9SDaniel Drake * Disables a USB device that isn't in active use. 44448dd8d2c9SDaniel Drake */ 44458dd8d2c9SDaniel Drake int usb_port_disable(struct usb_device *udev) 44468dd8d2c9SDaniel Drake { 44478dd8d2c9SDaniel Drake struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 44488dd8d2c9SDaniel Drake 44498dd8d2c9SDaniel Drake return hub_port_disable(hub, udev->portnum, 0); 44508dd8d2c9SDaniel Drake } 44511da177e4SLinus Torvalds 44521da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 44531da177e4SLinus Torvalds * 44541da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 44551da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 44561da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 44571da177e4SLinus Torvalds * 44581da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 44591da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 44601da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 44611da177e4SLinus Torvalds * 44621da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 44631da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 44641da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 44651da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 44661da177e4SLinus Torvalds */ 4467ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 44681da177e4SLinus Torvalds { 44691da177e4SLinus Torvalds int ret; 44701da177e4SLinus Torvalds u16 portchange, portstatus; 44711da177e4SLinus Torvalds unsigned connection = 0xffff; 4472d99f6b41SDan Williams int total_time, stable_time = 0; 4473d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 44741da177e4SLinus Torvalds 44751da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 44761da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 44771da177e4SLinus Torvalds if (ret < 0) 44781da177e4SLinus Torvalds return ret; 44791da177e4SLinus Torvalds 44801da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 44811da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 4482ad493e5eSLan Tianyu if (!must_be_connected || 4483ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 44841da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 44851da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 44861da177e4SLinus Torvalds break; 44871da177e4SLinus Torvalds } else { 44881da177e4SLinus Torvalds stable_time = 0; 44891da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 44901da177e4SLinus Torvalds } 44911da177e4SLinus Torvalds 44921da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4493ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 44941da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 44951da177e4SLinus Torvalds } 44961da177e4SLinus Torvalds 44971da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 44981da177e4SLinus Torvalds break; 44991da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 45001da177e4SLinus Torvalds } 45011da177e4SLinus Torvalds 4502d99f6b41SDan Williams dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", 4503d99f6b41SDan Williams total_time, stable_time, portstatus); 45041da177e4SLinus Torvalds 45051da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 45061da177e4SLinus Torvalds return -ETIMEDOUT; 45071da177e4SLinus Torvalds return portstatus; 45081da177e4SLinus Torvalds } 45091da177e4SLinus Torvalds 4510fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 45111da177e4SLinus Torvalds { 4512ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 4513ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 45142caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 45151da177e4SLinus Torvalds } 4516fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 45171da177e4SLinus Torvalds 45181da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 45191da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 45201da177e4SLinus Torvalds 45214326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 45221da177e4SLinus Torvalds { 45231da177e4SLinus Torvalds int retval; 4524c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 45251da177e4SLinus Torvalds 4526c6515272SSarah Sharp /* 4527c6515272SSarah Sharp * The host controller will choose the device address, 4528c6515272SSarah Sharp * instead of the core having chosen it earlier 4529c6515272SSarah Sharp */ 4530c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 45311da177e4SLinus Torvalds return -EINVAL; 45321da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 45331da177e4SLinus Torvalds return 0; 45341da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 45351da177e4SLinus Torvalds return -EINVAL; 4536c8d4af8eSAndiry Xu if (hcd->driver->address_device) 4537c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 4538c8d4af8eSAndiry Xu else 45391da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 45404326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 45411da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 45421da177e4SLinus Torvalds if (retval == 0) { 45433b29b68bSAlan Stern update_devnum(udev, devnum); 45444953d141SDavid Vrabel /* Device now using proper address. */ 45451da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 4546fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 45471da177e4SLinus Torvalds } 45481da177e4SLinus Torvalds return retval; 45491da177e4SLinus Torvalds } 45501da177e4SLinus Torvalds 4551890dae88SMathias Nyman /* 4552890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 4553890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 4554890dae88SMathias Nyman * enabled. 4555890dae88SMathias Nyman * 4556890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 4557890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 4558890dae88SMathias Nyman * support bit in the BOS descriptor. 4559890dae88SMathias Nyman */ 4560890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 4561890dae88SMathias Nyman { 4562d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 4563d99f6b41SDan Williams int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; 4564890dae88SMathias Nyman 45657b2db29fSGuenter Roeck if (!udev->usb2_hw_lpm_capable || !udev->bos) 4566890dae88SMathias Nyman return; 4567890dae88SMathias Nyman 4568d99f6b41SDan Williams if (hub) 4569d99f6b41SDan Williams connect_type = hub->ports[udev->portnum - 1]->connect_type; 4570890dae88SMathias Nyman 457123c05820SBjørn Mork if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || 4572890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 4573890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 45747529b257SKai-Heng Feng usb_enable_usb2_hardware_lpm(udev); 4575890dae88SMathias Nyman } 4576890dae88SMathias Nyman } 4577890dae88SMathias Nyman 457848fc7dbdSDan Williams static int hub_enable_device(struct usb_device *udev) 457948fc7dbdSDan Williams { 458048fc7dbdSDan Williams struct usb_hcd *hcd = bus_to_hcd(udev->bus); 458148fc7dbdSDan Williams 458248fc7dbdSDan Williams if (!hcd->driver->enable_device) 458348fc7dbdSDan Williams return 0; 458448fc7dbdSDan Williams if (udev->state == USB_STATE_ADDRESS) 458548fc7dbdSDan Williams return 0; 458648fc7dbdSDan Williams if (udev->state != USB_STATE_DEFAULT) 458748fc7dbdSDan Williams return -EINVAL; 458848fc7dbdSDan Williams 458948fc7dbdSDan Williams return hcd->driver->enable_device(hcd, udev); 459048fc7dbdSDan Williams } 459148fc7dbdSDan Williams 45921da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 45931da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 45941da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 45951da177e4SLinus Torvalds * 45961da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 45975c79a1e3SDan Williams * usb_reset_and_verify_device), the caller must own the device lock and 45985c79a1e3SDan Williams * the port lock. For a newly detected device that is not accessible 45995c79a1e3SDan Williams * through any global pointers, it's not necessary to lock the device, 46005c79a1e3SDan Williams * but it is still necessary to lock the port. 46011da177e4SLinus Torvalds */ 46021da177e4SLinus Torvalds static int 46031da177e4SLinus Torvalds hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, 46041da177e4SLinus Torvalds int retry_counter) 46051da177e4SLinus Torvalds { 46061da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4607e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 460825244227SNicolas Boichat struct usb_port *port_dev = hub->ports[port1 - 1]; 46090d5ce778SOliver Neukum int retries, operations, retval, i; 46101da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 46111da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4612e538dfdaSMichal Nazarewicz const char *speed; 46134326ed0bSAlan Stern int devnum = udev->devnum; 46141bb90cf0SPeter Chen const char *driver_name; 461519502e69SAlan Stern bool do_new_scheme; 46161da177e4SLinus Torvalds 46171da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 46181da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 46191da177e4SLinus Torvalds */ 46201da177e4SLinus Torvalds if (!hdev->parent) { 46211da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 46221da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 46231da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 46241da177e4SLinus Torvalds } 46251da177e4SLinus Torvalds 46261da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 46271da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 46281da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 46291da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 46301da177e4SLinus Torvalds 4631feb26ac3SChris Bainbridge mutex_lock(hcd->address0_mutex); 46321da177e4SLinus Torvalds 46331da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4634e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 463575d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 46361da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 46371da177e4SLinus Torvalds goto fail; 46381da177e4SLinus Torvalds /* success, speed is known */ 463907194ab7SLuben Tuikov 46401da177e4SLinus Torvalds retval = -ENODEV; 46411da177e4SLinus Torvalds 46428a1b2725SMathias Nyman /* Don't allow speed changes at reset, except usb 3.0 to faster */ 46438a1b2725SMathias Nyman if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && 46448a1b2725SMathias Nyman !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { 46451da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 46461da177e4SLinus Torvalds goto fail; 46471da177e4SLinus Torvalds } 46481da177e4SLinus Torvalds oldspeed = udev->speed; 46491da177e4SLinus Torvalds 46501da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 46511da177e4SLinus Torvalds * it's fixed size except for full speed devices. 46525bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 46535bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 46541da177e4SLinus Torvalds */ 46551da177e4SLinus Torvalds switch (udev->speed) { 46568a1b2725SMathias Nyman case USB_SPEED_SUPER_PLUS: 46576b403b02SSarah Sharp case USB_SPEED_SUPER: 4658551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4659551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 46605bb6e0aeSInaky Perez-Gonzalez break; 46611da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4662551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 46631da177e4SLinus Torvalds break; 46641da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 46651da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 46661da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 46671da177e4SLinus Torvalds * then correct our initial guess. 46681da177e4SLinus Torvalds */ 4669551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 46701da177e4SLinus Torvalds break; 46711da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4672551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 46731da177e4SLinus Torvalds break; 46741da177e4SLinus Torvalds default: 46751da177e4SLinus Torvalds goto fail; 46761da177e4SLinus Torvalds } 46771da177e4SLinus Torvalds 4678e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4679e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4680e538dfdaSMichal Nazarewicz else 4681e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4682e538dfdaSMichal Nazarewicz 46831bb90cf0SPeter Chen /* 46841bb90cf0SPeter Chen * The controller driver may be NULL if the controller device 46851bb90cf0SPeter Chen * is the middle device between platform device and roothub. 46861bb90cf0SPeter Chen * This middle device may not need a device driver due to 46871bb90cf0SPeter Chen * all hardware control can be at platform device driver, this 46881bb90cf0SPeter Chen * platform device is usually a dual-role USB controller device. 46891bb90cf0SPeter Chen */ 46901bb90cf0SPeter Chen if (udev->bus->controller->driver) 46911bb90cf0SPeter Chen driver_name = udev->bus->controller->driver->name; 46921bb90cf0SPeter Chen else 46931bb90cf0SPeter Chen driver_name = udev->bus->sysdev->driver->name; 46941bb90cf0SPeter Chen 46958a1b2725SMathias Nyman if (udev->speed < USB_SPEED_SUPER) 469683a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4697e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4698e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 46991bb90cf0SPeter Chen devnum, driver_name); 47001da177e4SLinus Torvalds 47011da177e4SLinus Torvalds /* Set up TT records, if needed */ 47021da177e4SLinus Torvalds if (hdev->tt) { 47031da177e4SLinus Torvalds udev->tt = hdev->tt; 47041da177e4SLinus Torvalds udev->ttport = hdev->ttport; 47051da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 47061da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4707d199c96dSAlan Stern if (!hub->tt.hub) { 4708d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4709d199c96dSAlan Stern retval = -EINVAL; 4710d199c96dSAlan Stern goto fail; 4711d199c96dSAlan Stern } 47121da177e4SLinus Torvalds udev->tt = &hub->tt; 47131da177e4SLinus Torvalds udev->ttport = port1; 47141da177e4SLinus Torvalds } 47151da177e4SLinus Torvalds 47161da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 47171da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 47181da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 47191da177e4SLinus Torvalds * Change it cautiously. 47201da177e4SLinus Torvalds * 472148fc7dbdSDan Williams * NOTE: If use_new_scheme() is true we will start by issuing 47221da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 47231da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 47241da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 47251da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 47261da177e4SLinus Torvalds * value. 47271da177e4SLinus Torvalds */ 472819502e69SAlan Stern do_new_scheme = use_new_scheme(udev, retry_counter, port_dev); 472948fc7dbdSDan Williams 473019502e69SAlan Stern for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { 473119502e69SAlan Stern if (do_new_scheme) { 47321da177e4SLinus Torvalds struct usb_device_descriptor *buf; 47331da177e4SLinus Torvalds int r = 0; 47341da177e4SLinus Torvalds 473548fc7dbdSDan Williams retval = hub_enable_device(udev); 4736938569ebSOliver Neukum if (retval < 0) { 4737938569ebSOliver Neukum dev_err(&udev->dev, 4738938569ebSOliver Neukum "hub failed to enable device, error %d\n", 4739938569ebSOliver Neukum retval); 474048fc7dbdSDan Williams goto fail; 4741938569ebSOliver Neukum } 474248fc7dbdSDan Williams 47431da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 47441da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 47451da177e4SLinus Torvalds if (!buf) { 47461da177e4SLinus Torvalds retval = -ENOMEM; 47471da177e4SLinus Torvalds continue; 47481da177e4SLinus Torvalds } 47491da177e4SLinus Torvalds 4750b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4751b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4752b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 47531da177e4SLinus Torvalds */ 4754fb6f076dSAlan Stern for (operations = 0; operations < GET_MAXPACKET0_TRIES; 4755fb6f076dSAlan Stern ++operations) { 47561da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 47571da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 47581da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 47591da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 47601da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4761fd7c519dSJaroslav Kysela initial_descriptor_timeout); 47621da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 47635bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 47641da177e4SLinus Torvalds if (buf->bDescriptorType == 47651da177e4SLinus Torvalds USB_DT_DEVICE) { 47661da177e4SLinus Torvalds r = 0; 47671da177e4SLinus Torvalds break; 47681da177e4SLinus Torvalds } 47690d9b6d49SGustavo A. R. Silva fallthrough; 47701da177e4SLinus Torvalds default: 47711da177e4SLinus Torvalds if (r == 0) 47721da177e4SLinus Torvalds r = -EPROTO; 47731da177e4SLinus Torvalds break; 47741da177e4SLinus Torvalds } 4775264904ccSOliver Neukum /* 4776264904ccSOliver Neukum * Some devices time out if they are powered on 4777264904ccSOliver Neukum * when already connected. They need a second 4778264904ccSOliver Neukum * reset. But only on the first attempt, 4779264904ccSOliver Neukum * lest we get into a time out/reset loop 4780264904ccSOliver Neukum */ 47816e01827eSMaxim Moseychuk if (r == 0 || (r == -ETIMEDOUT && 47826e01827eSMaxim Moseychuk retries == 0 && 47836e01827eSMaxim Moseychuk udev->speed > USB_SPEED_FULL)) 47841da177e4SLinus Torvalds break; 47851da177e4SLinus Torvalds } 47861da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 47871da177e4SLinus Torvalds buf->bMaxPacketSize0; 47881da177e4SLinus Torvalds kfree(buf); 47891da177e4SLinus Torvalds 479075d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 47911da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 47921da177e4SLinus Torvalds goto fail; 47931da177e4SLinus Torvalds if (oldspeed != udev->speed) { 47941da177e4SLinus Torvalds dev_dbg(&udev->dev, 47951da177e4SLinus Torvalds "device reset changed speed!\n"); 47961da177e4SLinus Torvalds retval = -ENODEV; 47971da177e4SLinus Torvalds goto fail; 47981da177e4SLinus Torvalds } 47991da177e4SLinus Torvalds if (r) { 4800e9e88fb7SAlan Stern if (r != -ENODEV) 4801e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4802b9cef6c3SWu Fengguang r); 48031da177e4SLinus Torvalds retval = -EMSGSIZE; 48041da177e4SLinus Torvalds continue; 48051da177e4SLinus Torvalds } 48061da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 48071da177e4SLinus Torvalds } 48081da177e4SLinus Torvalds 48096c529cdcSInaky Perez-Gonzalez /* 48106c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 48116c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 48126c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 48136c529cdcSInaky Perez-Gonzalez */ 48146c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 48150d5ce778SOliver Neukum for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { 48164326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 48171da177e4SLinus Torvalds if (retval >= 0) 48181da177e4SLinus Torvalds break; 48191da177e4SLinus Torvalds msleep(200); 48201da177e4SLinus Torvalds } 48211da177e4SLinus Torvalds if (retval < 0) { 4822e9e88fb7SAlan Stern if (retval != -ENODEV) 4823e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 48244326ed0bSAlan Stern devnum, retval); 48251da177e4SLinus Torvalds goto fail; 48261da177e4SLinus Torvalds } 48278a1b2725SMathias Nyman if (udev->speed >= USB_SPEED_SUPER) { 4828c6515272SSarah Sharp devnum = udev->devnum; 4829c6515272SSarah Sharp dev_info(&udev->dev, 483045455e4dSMathias Nyman "%s SuperSpeed%s%s USB device number %d using %s\n", 4831c6515272SSarah Sharp (udev->config) ? "reset" : "new", 483245455e4dSMathias Nyman (udev->speed == USB_SPEED_SUPER_PLUS) ? 4833*2d0e82c9SThinh Nguyen " Plus" : "", 4834*2d0e82c9SThinh Nguyen (udev->ssp_rate == USB_SSP_GEN_2x2) ? 4835*2d0e82c9SThinh Nguyen " Gen 2x2" : 4836*2d0e82c9SThinh Nguyen (udev->ssp_rate == USB_SSP_GEN_2x1) ? 4837*2d0e82c9SThinh Nguyen " Gen 2x1" : 4838*2d0e82c9SThinh Nguyen (udev->ssp_rate == USB_SSP_GEN_1x2) ? 4839*2d0e82c9SThinh Nguyen " Gen 1x2" : "", 48401bb90cf0SPeter Chen devnum, driver_name); 4841c6515272SSarah Sharp } 48421da177e4SLinus Torvalds 48431da177e4SLinus Torvalds /* cope with hardware quirkiness: 48441da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 48451da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 48461da177e4SLinus Torvalds */ 48471da177e4SLinus Torvalds msleep(10); 484819502e69SAlan Stern if (do_new_scheme) 48491da177e4SLinus Torvalds break; 48506c529cdcSInaky Perez-Gonzalez } 48511da177e4SLinus Torvalds 48521da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 48531da177e4SLinus Torvalds if (retval < 8) { 4854e9e88fb7SAlan Stern if (retval != -ENODEV) 4855b9cef6c3SWu Fengguang dev_err(&udev->dev, 4856b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4857b9cef6c3SWu Fengguang retval); 48581da177e4SLinus Torvalds if (retval >= 0) 48591da177e4SLinus Torvalds retval = -EMSGSIZE; 48601da177e4SLinus Torvalds } else { 4861886ee36eSFelipe Balbi u32 delay; 4862886ee36eSFelipe Balbi 48631da177e4SLinus Torvalds retval = 0; 4864886ee36eSFelipe Balbi 4865886ee36eSFelipe Balbi delay = udev->parent->hub_delay; 4866886ee36eSFelipe Balbi udev->hub_delay = min_t(u32, delay, 4867886ee36eSFelipe Balbi USB_TP_TRANSMISSION_DELAY_MAX); 4868886ee36eSFelipe Balbi retval = usb_set_isoch_delay(udev); 4869886ee36eSFelipe Balbi if (retval) { 4870886ee36eSFelipe Balbi dev_dbg(&udev->dev, 4871886ee36eSFelipe Balbi "Failed set isoch delay, error %d\n", 4872886ee36eSFelipe Balbi retval); 4873886ee36eSFelipe Balbi retval = 0; 4874886ee36eSFelipe Balbi } 48751da177e4SLinus Torvalds break; 48761da177e4SLinus Torvalds } 48771da177e4SLinus Torvalds } 48781da177e4SLinus Torvalds if (retval) 48791da177e4SLinus Torvalds goto fail; 48801da177e4SLinus Torvalds 4881d8aec3dbSElric Fu /* 4882d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4883d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4884d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4885d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4886d8aec3dbSElric Fu */ 48878a1b2725SMathias Nyman if ((udev->speed >= USB_SPEED_SUPER) && 4888d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4889d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4890d8aec3dbSElric Fu "warm reset device\n"); 4891d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4892d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4893d8aec3dbSElric Fu retval = -EINVAL; 4894d8aec3dbSElric Fu goto fail; 4895d8aec3dbSElric Fu } 4896d8aec3dbSElric Fu 48976b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 48988a1b2725SMathias Nyman udev->speed >= USB_SPEED_SUPER) 48996b403b02SSarah Sharp i = 512; 49006b403b02SSarah Sharp else 49016b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 490229cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 490356626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 49041da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 490556626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 49061da177e4SLinus Torvalds retval = -EMSGSIZE; 49071da177e4SLinus Torvalds goto fail; 49081da177e4SLinus Torvalds } 490956626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 49101da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 491156626a72SAlan Stern else 491256626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 49131da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4914fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 49151da177e4SLinus Torvalds } 49161da177e4SLinus Torvalds 49171da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 49181da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4919e9e88fb7SAlan Stern if (retval != -ENODEV) 4920b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4921b9cef6c3SWu Fengguang retval); 49221da177e4SLinus Torvalds if (retval >= 0) 49231da177e4SLinus Torvalds retval = -ENOMSG; 49241da177e4SLinus Torvalds goto fail; 49251da177e4SLinus Torvalds } 49261da177e4SLinus Torvalds 4927ad87e032SAlan Stern usb_detect_quirks(udev); 4928ad87e032SAlan Stern 49291ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 49301ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 493151e0a012SSarah Sharp if (!retval) { 4932d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 493351e0a012SSarah Sharp usb_set_lpm_parameters(udev); 493451e0a012SSarah Sharp } 49351ff4df56SAndiry Xu } 49363148bf04SAndiry Xu 49371da177e4SLinus Torvalds retval = 0; 493848f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 493948f24970SAlek Du if (hcd->driver->update_device) 494048f24970SAlek Du hcd->driver->update_device(hcd, udev); 4941890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 49421da177e4SLinus Torvalds fail: 49434326ed0bSAlan Stern if (retval) { 49441da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 49453b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 49464326ed0bSAlan Stern } 4947feb26ac3SChris Bainbridge mutex_unlock(hcd->address0_mutex); 49481da177e4SLinus Torvalds return retval; 49491da177e4SLinus Torvalds } 49501da177e4SLinus Torvalds 49511da177e4SLinus Torvalds static void 49521da177e4SLinus Torvalds check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) 49531da177e4SLinus Torvalds { 49541da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 49551da177e4SLinus Torvalds int status; 49561da177e4SLinus Torvalds 49572a159389SJohan Hovold if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) 49582a159389SJohan Hovold return; 49592a159389SJohan Hovold 4960e94b1766SChristoph Lameter qual = kmalloc(sizeof *qual, GFP_KERNEL); 49611da177e4SLinus Torvalds if (qual == NULL) 49621da177e4SLinus Torvalds return; 49631da177e4SLinus Torvalds 49641da177e4SLinus Torvalds status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, 49651da177e4SLinus Torvalds qual, sizeof *qual); 49661da177e4SLinus Torvalds if (status == sizeof *qual) { 49671da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 49681da177e4SLinus Torvalds "connect to a high speed hub\n"); 49691da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 49701da177e4SLinus Torvalds if (hub->has_indicators) { 49711da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 497222f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 497322f6a0f0SShaibal Dutta &hub->leds, 0); 49741da177e4SLinus Torvalds } 49751da177e4SLinus Torvalds } 49761da177e4SLinus Torvalds kfree(qual); 49771da177e4SLinus Torvalds } 49781da177e4SLinus Torvalds 49791da177e4SLinus Torvalds static unsigned 49801da177e4SLinus Torvalds hub_power_remaining(struct usb_hub *hub) 49811da177e4SLinus Torvalds { 49821da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 49831da177e4SLinus Torvalds int remaining; 498455c52718SAlan Stern int port1; 49851da177e4SLinus Torvalds 498655c52718SAlan Stern if (!hub->limited_power) 49871da177e4SLinus Torvalds return 0; 49881da177e4SLinus Torvalds 498955c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 499055c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4991d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4992d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 4993430ee58eSSebastian Andrzej Siewior unsigned unit_load; 4994d99f6b41SDan Williams int delta; 49951da177e4SLinus Torvalds 49961da177e4SLinus Torvalds if (!udev) 49971da177e4SLinus Torvalds continue; 4998430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4999430ee58eSSebastian Andrzej Siewior unit_load = 150; 5000430ee58eSSebastian Andrzej Siewior else 5001430ee58eSSebastian Andrzej Siewior unit_load = 100; 50021da177e4SLinus Torvalds 5003430ee58eSSebastian Andrzej Siewior /* 5004430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 5005430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 5006430ee58eSSebastian Andrzej Siewior */ 50071da177e4SLinus Torvalds if (udev->actconfig) 50088d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 500955c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 5010430ee58eSSebastian Andrzej Siewior delta = unit_load; 50111da177e4SLinus Torvalds else 501255c52718SAlan Stern delta = 8; 501355c52718SAlan Stern if (delta > hub->mA_per_port) 5014d99f6b41SDan Williams dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", 5015d99f6b41SDan Williams delta, hub->mA_per_port); 50161da177e4SLinus Torvalds remaining -= delta; 50171da177e4SLinus Torvalds } 50181da177e4SLinus Torvalds if (remaining < 0) { 501955c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 502055c52718SAlan Stern -remaining); 50211da177e4SLinus Torvalds remaining = 0; 50221da177e4SLinus Torvalds } 50231da177e4SLinus Torvalds return remaining; 50241da177e4SLinus Torvalds } 50251da177e4SLinus Torvalds 5026a4f55d8bSDavid Heinzelmann 5027a4f55d8bSDavid Heinzelmann static int descriptors_changed(struct usb_device *udev, 5028a4f55d8bSDavid Heinzelmann struct usb_device_descriptor *old_device_descriptor, 5029a4f55d8bSDavid Heinzelmann struct usb_host_bos *old_bos) 5030a4f55d8bSDavid Heinzelmann { 5031a4f55d8bSDavid Heinzelmann int changed = 0; 5032a4f55d8bSDavid Heinzelmann unsigned index; 5033a4f55d8bSDavid Heinzelmann unsigned serial_len = 0; 5034a4f55d8bSDavid Heinzelmann unsigned len; 5035a4f55d8bSDavid Heinzelmann unsigned old_length; 5036a4f55d8bSDavid Heinzelmann int length; 5037a4f55d8bSDavid Heinzelmann char *buf; 5038a4f55d8bSDavid Heinzelmann 5039a4f55d8bSDavid Heinzelmann if (memcmp(&udev->descriptor, old_device_descriptor, 5040a4f55d8bSDavid Heinzelmann sizeof(*old_device_descriptor)) != 0) 5041a4f55d8bSDavid Heinzelmann return 1; 5042a4f55d8bSDavid Heinzelmann 5043a4f55d8bSDavid Heinzelmann if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5044a4f55d8bSDavid Heinzelmann return 1; 5045a4f55d8bSDavid Heinzelmann if (udev->bos) { 5046a4f55d8bSDavid Heinzelmann len = le16_to_cpu(udev->bos->desc->wTotalLength); 5047a4f55d8bSDavid Heinzelmann if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5048a4f55d8bSDavid Heinzelmann return 1; 5049a4f55d8bSDavid Heinzelmann if (memcmp(udev->bos->desc, old_bos->desc, len)) 5050a4f55d8bSDavid Heinzelmann return 1; 5051a4f55d8bSDavid Heinzelmann } 5052a4f55d8bSDavid Heinzelmann 5053a4f55d8bSDavid Heinzelmann /* Since the idVendor, idProduct, and bcdDevice values in the 5054a4f55d8bSDavid Heinzelmann * device descriptor haven't changed, we will assume the 5055a4f55d8bSDavid Heinzelmann * Manufacturer and Product strings haven't changed either. 5056a4f55d8bSDavid Heinzelmann * But the SerialNumber string could be different (e.g., a 5057a4f55d8bSDavid Heinzelmann * different flash card of the same brand). 5058a4f55d8bSDavid Heinzelmann */ 5059a4f55d8bSDavid Heinzelmann if (udev->serial) 5060a4f55d8bSDavid Heinzelmann serial_len = strlen(udev->serial) + 1; 5061a4f55d8bSDavid Heinzelmann 5062a4f55d8bSDavid Heinzelmann len = serial_len; 5063a4f55d8bSDavid Heinzelmann for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5064a4f55d8bSDavid Heinzelmann old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5065a4f55d8bSDavid Heinzelmann len = max(len, old_length); 5066a4f55d8bSDavid Heinzelmann } 5067a4f55d8bSDavid Heinzelmann 5068a4f55d8bSDavid Heinzelmann buf = kmalloc(len, GFP_NOIO); 5069a4f55d8bSDavid Heinzelmann if (!buf) 5070a4f55d8bSDavid Heinzelmann /* assume the worst */ 5071a4f55d8bSDavid Heinzelmann return 1; 5072a4f55d8bSDavid Heinzelmann 5073a4f55d8bSDavid Heinzelmann for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5074a4f55d8bSDavid Heinzelmann old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5075a4f55d8bSDavid Heinzelmann length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 5076a4f55d8bSDavid Heinzelmann old_length); 5077a4f55d8bSDavid Heinzelmann if (length != old_length) { 5078a4f55d8bSDavid Heinzelmann dev_dbg(&udev->dev, "config index %d, error %d\n", 5079a4f55d8bSDavid Heinzelmann index, length); 5080a4f55d8bSDavid Heinzelmann changed = 1; 5081a4f55d8bSDavid Heinzelmann break; 5082a4f55d8bSDavid Heinzelmann } 5083a4f55d8bSDavid Heinzelmann if (memcmp(buf, udev->rawdescriptors[index], old_length) 5084a4f55d8bSDavid Heinzelmann != 0) { 5085a4f55d8bSDavid Heinzelmann dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5086a4f55d8bSDavid Heinzelmann index, 5087a4f55d8bSDavid Heinzelmann ((struct usb_config_descriptor *) buf)-> 5088a4f55d8bSDavid Heinzelmann bConfigurationValue); 5089a4f55d8bSDavid Heinzelmann changed = 1; 5090a4f55d8bSDavid Heinzelmann break; 5091a4f55d8bSDavid Heinzelmann } 5092a4f55d8bSDavid Heinzelmann } 5093a4f55d8bSDavid Heinzelmann 5094a4f55d8bSDavid Heinzelmann if (!changed && serial_len) { 5095a4f55d8bSDavid Heinzelmann length = usb_string(udev, udev->descriptor.iSerialNumber, 5096a4f55d8bSDavid Heinzelmann buf, serial_len); 5097a4f55d8bSDavid Heinzelmann if (length + 1 != serial_len) { 5098a4f55d8bSDavid Heinzelmann dev_dbg(&udev->dev, "serial string error %d\n", 5099a4f55d8bSDavid Heinzelmann length); 5100a4f55d8bSDavid Heinzelmann changed = 1; 5101a4f55d8bSDavid Heinzelmann } else if (memcmp(buf, udev->serial, length) != 0) { 5102a4f55d8bSDavid Heinzelmann dev_dbg(&udev->dev, "serial string changed\n"); 5103a4f55d8bSDavid Heinzelmann changed = 1; 5104a4f55d8bSDavid Heinzelmann } 5105a4f55d8bSDavid Heinzelmann } 5106a4f55d8bSDavid Heinzelmann 5107a4f55d8bSDavid Heinzelmann kfree(buf); 5108a4f55d8bSDavid Heinzelmann return changed; 5109a4f55d8bSDavid Heinzelmann } 5110a4f55d8bSDavid Heinzelmann 5111af376a46SDan Williams static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, 5112af376a46SDan Williams u16 portchange) 51131da177e4SLinus Torvalds { 511494c43b98SAlan Stern int status = -ENODEV; 511594c43b98SAlan Stern int i; 5116430ee58eSSebastian Andrzej Siewior unsigned unit_load; 51171da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 51181da177e4SLinus Torvalds struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 5119d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 5120af376a46SDan Williams struct usb_device *udev = port_dev->child; 51215ee0f803SOliver Neukum static int unreliable_port = -1; 51228808f00cSAlan Stern 512324618b0cSAlan Stern /* Disconnect any existing devices under this port */ 5124b76baa81SPeter Chen if (udev) { 5125b2108f1eSPeter Chen if (hcd->usb_phy && !hdev->parent) 51263d46e73dSAntoine Tenart usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); 5127d99f6b41SDan Williams usb_disconnect(&port_dev->child); 5128b76baa81SPeter Chen } 512924618b0cSAlan Stern 5130253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 5131253e0572SAlan Stern * disconnect or the connect status changes. 5132253e0572SAlan Stern */ 5133253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 5134253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 5135253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 5136253e0572SAlan Stern 51375257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 51385257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 5139ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 51405257d97aSAlan Stern if (status < 0) { 51415ee0f803SOliver Neukum if (status != -ENODEV && 51425ee0f803SOliver Neukum port1 != unreliable_port && 51435ee0f803SOliver Neukum printk_ratelimit()) 5144dd5f5006STakashi Iwai dev_err(&port_dev->dev, "connect-debounce failed\n"); 51455257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 51465ee0f803SOliver Neukum unreliable_port = port1; 51475257d97aSAlan Stern } else { 51485257d97aSAlan Stern portstatus = status; 51495257d97aSAlan Stern } 51505257d97aSAlan Stern } 51515257d97aSAlan Stern 5152253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 5153253e0572SAlan Stern * the device was "removed". 5154253e0572SAlan Stern */ 5155253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 5156253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 51571da177e4SLinus Torvalds 5158fbaecff0SDeepak Das /* 5159fbaecff0SDeepak Das * maybe switch power back on (e.g. root hub was reset) 5160fbaecff0SDeepak Das * but only if the port isn't owned by someone else. 5161fbaecff0SDeepak Das */ 51629262c19dSDan Williams if (hub_is_port_power_switchable(hub) 5163fbaecff0SDeepak Das && !port_is_power_on(hub, portstatus) 5164fbaecff0SDeepak Das && !port_dev->port_owner) 51651da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 51661da177e4SLinus Torvalds 51671da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 51681da177e4SLinus Torvalds goto done; 51691da177e4SLinus Torvalds return; 51701da177e4SLinus Torvalds } 5171430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 5172430ee58eSSebastian Andrzej Siewior unit_load = 150; 5173430ee58eSSebastian Andrzej Siewior else 5174430ee58eSSebastian Andrzej Siewior unit_load = 100; 51751da177e4SLinus Torvalds 5176e9e88fb7SAlan Stern status = 0; 517719502e69SAlan Stern for (i = 0; i < PORT_INIT_TRIES; i++) { 51781da177e4SLinus Torvalds 51791da177e4SLinus Torvalds /* reallocate for each attempt, since references 51801da177e4SLinus Torvalds * to the previous one can escape in various ways 51811da177e4SLinus Torvalds */ 51821da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 51831da177e4SLinus Torvalds if (!udev) { 5184d99f6b41SDan Williams dev_err(&port_dev->dev, 5185d99f6b41SDan Williams "couldn't allocate usb_device\n"); 51861da177e4SLinus Torvalds goto done; 51871da177e4SLinus Torvalds } 51881da177e4SLinus Torvalds 51891da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 519055c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 5191b6956ffaSAlan Stern udev->level = hdev->level + 1; 51928af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 51931da177e4SLinus Torvalds 51948a1b2725SMathias Nyman /* Devices connected to SuperSpeed hubs are USB 3.0 or later */ 5195131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 5196e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 5197e7b77172SSarah Sharp else 5198e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 5199e7b77172SSarah Sharp 52003b29b68bSAlan Stern choose_devnum(udev); 5201c6515272SSarah Sharp if (udev->devnum <= 0) { 5202c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 5203c6515272SSarah Sharp goto loop; 5204c6515272SSarah Sharp } 5205c6515272SSarah Sharp 5206e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 52075c79a1e3SDan Williams usb_lock_port(port_dev); 52081da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 52095c79a1e3SDan Williams usb_unlock_port(port_dev); 52101da177e4SLinus Torvalds if (status < 0) 52111da177e4SLinus Torvalds goto loop; 52121da177e4SLinus Torvalds 521393362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 5214b2a542bbSDmitry Fleytman msleep(2000); 521593362a87SPhil Dibowitz 52161da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 52171da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 52181da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 52191da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 52201da177e4SLinus Torvalds * on the parent. 52211da177e4SLinus Torvalds */ 52221da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 5223430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 52241da177e4SLinus Torvalds u16 devstat; 52251da177e4SLinus Torvalds 5226d9e1e148SFelipe Balbi status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, 52271da177e4SLinus Torvalds &devstat); 522815b7336eSAlan Stern if (status) { 52291da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 52301da177e4SLinus Torvalds goto loop_disable; 52311da177e4SLinus Torvalds } 52321da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 52331da177e4SLinus Torvalds dev_err(&udev->dev, 52341da177e4SLinus Torvalds "can't connect bus-powered hub " 52351da177e4SLinus Torvalds "to this port\n"); 52361da177e4SLinus Torvalds if (hub->has_indicators) { 52371da177e4SLinus Torvalds hub->indicator[port1-1] = 52381da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 523922f6a0f0SShaibal Dutta queue_delayed_work( 524022f6a0f0SShaibal Dutta system_power_efficient_wq, 524122f6a0f0SShaibal Dutta &hub->leds, 0); 52421da177e4SLinus Torvalds } 52431da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 52441da177e4SLinus Torvalds goto loop_disable; 52451da177e4SLinus Torvalds } 52461da177e4SLinus Torvalds } 52471da177e4SLinus Torvalds 52481da177e4SLinus Torvalds /* check for devices running slower than they could */ 52491da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 52501da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 52511da177e4SLinus Torvalds && highspeed_hubs != 0) 52521da177e4SLinus Torvalds check_highspeed(hub, udev, port1); 52531da177e4SLinus Torvalds 5254fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 52551da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 52561da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 52571da177e4SLinus Torvalds */ 52581da177e4SLinus Torvalds status = 0; 52591da177e4SLinus Torvalds 5260d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 5261d8521afeSDan Williams 52621da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 52631da177e4SLinus Torvalds * been disconnected; we would race with the 52641da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 52651da177e4SLinus Torvalds */ 52661da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 52671da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 52681da177e4SLinus Torvalds status = -ENOTCONN; 52691da177e4SLinus Torvalds else 5270d99f6b41SDan Williams port_dev->child = udev; 52711da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 5272d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 52731da177e4SLinus Torvalds 52741da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 52751da177e4SLinus Torvalds if (!status) { 52761da177e4SLinus Torvalds status = usb_new_device(udev); 52771da177e4SLinus Torvalds if (status) { 5278d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 52791da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 5280d99f6b41SDan Williams port_dev->child = NULL; 52811da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 5282d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 528301ed67dcSTony Zheng } else { 528401ed67dcSTony Zheng if (hcd->usb_phy && !hdev->parent) 528501ed67dcSTony Zheng usb_phy_notify_connect(hcd->usb_phy, 528601ed67dcSTony Zheng udev->speed); 52871da177e4SLinus Torvalds } 52881da177e4SLinus Torvalds } 52891da177e4SLinus Torvalds 52901da177e4SLinus Torvalds if (status) 52911da177e4SLinus Torvalds goto loop_disable; 52921da177e4SLinus Torvalds 52931da177e4SLinus Torvalds status = hub_power_remaining(hub); 52941da177e4SLinus Torvalds if (status) 5295d99f6b41SDan Williams dev_dbg(hub->intfdev, "%dmA power budget left\n", status); 52961da177e4SLinus Torvalds 52971da177e4SLinus Torvalds return; 52981da177e4SLinus Torvalds 52991da177e4SLinus Torvalds loop_disable: 53001da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 53011da177e4SLinus Torvalds loop: 5302fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 53033b29b68bSAlan Stern release_devnum(udev); 5304f7410cedSHerbert Xu hub_free_dev(udev); 53051da177e4SLinus Torvalds usb_put_dev(udev); 5306ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 53071da177e4SLinus Torvalds break; 5308973593a9SMike Looijmans 5309973593a9SMike Looijmans /* When halfway through our retry count, power-cycle the port */ 531019502e69SAlan Stern if (i == (PORT_INIT_TRIES - 1) / 2) { 5311973593a9SMike Looijmans dev_info(&port_dev->dev, "attempt power cycle\n"); 5312973593a9SMike Looijmans usb_hub_set_port_power(hdev, hub, port1, false); 5313973593a9SMike Looijmans msleep(2 * hub_power_on_good_delay(hub)); 5314973593a9SMike Looijmans usb_hub_set_port_power(hdev, hub, port1, true); 5315973593a9SMike Looijmans msleep(hub_power_on_good_delay(hub)); 5316973593a9SMike Looijmans } 53171da177e4SLinus Torvalds } 53183a31155cSAlan Stern if (hub->hdev->parent || 53193a31155cSAlan Stern !hcd->driver->port_handed_over || 5320e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 5321e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 5322d99f6b41SDan Williams dev_err(&port_dev->dev, 5323d99f6b41SDan Williams "unable to enumerate USB device\n"); 5324e9e88fb7SAlan Stern } 53251da177e4SLinus Torvalds 53261da177e4SLinus Torvalds done: 53271da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 532894c43b98SAlan Stern if (hcd->driver->relinquish_port && !hub->hdev->parent) { 532994c43b98SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 533090da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 533194c43b98SAlan Stern } 53321da177e4SLinus Torvalds } 53331da177e4SLinus Torvalds 5334af376a46SDan Williams /* Handle physical or logical connection change events. 5335af376a46SDan Williams * This routine is called when: 5336af376a46SDan Williams * a port connection-change occurs; 5337af376a46SDan Williams * a port enable-change occurs (often caused by EMI); 5338af376a46SDan Williams * usb_reset_and_verify_device() encounters changed descriptors (as from 5339af376a46SDan Williams * a firmware download) 5340af376a46SDan Williams * caller already locked the hub 5341af376a46SDan Williams */ 5342af376a46SDan Williams static void hub_port_connect_change(struct usb_hub *hub, int port1, 534372937e1eSSarah Sharp u16 portstatus, u16 portchange) 53445c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 5345714b07beSSarah Sharp { 5346af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 5347af376a46SDan Williams struct usb_device *udev = port_dev->child; 5348a4f55d8bSDavid Heinzelmann struct usb_device_descriptor descriptor; 5349af376a46SDan Williams int status = -ENODEV; 5350a4f55d8bSDavid Heinzelmann int retval; 5351714b07beSSarah Sharp 5352af376a46SDan Williams dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, 5353af376a46SDan Williams portchange, portspeed(hub, portstatus)); 5354af376a46SDan Williams 5355af376a46SDan Williams if (hub->has_indicators) { 5356af376a46SDan Williams set_port_led(hub, port1, HUB_LED_AUTO); 5357af376a46SDan Williams hub->indicator[port1-1] = INDICATOR_AUTO; 53584ee823b8SSarah Sharp } 5359714b07beSSarah Sharp 5360af376a46SDan Williams #ifdef CONFIG_USB_OTG 5361af376a46SDan Williams /* during HNP, don't repeat the debounce */ 5362af376a46SDan Williams if (hub->hdev->bus->is_b_host) 5363af376a46SDan Williams portchange &= ~(USB_PORT_STAT_C_CONNECTION | 5364af376a46SDan Williams USB_PORT_STAT_C_ENABLE); 5365af376a46SDan Williams #endif 5366714b07beSSarah Sharp 5367af376a46SDan Williams /* Try to resuscitate an existing device */ 5368af376a46SDan Williams if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 5369af376a46SDan Williams udev->state != USB_STATE_NOTATTACHED) { 5370af376a46SDan Williams if (portstatus & USB_PORT_STAT_ENABLE) { 5371a4f55d8bSDavid Heinzelmann /* 5372a4f55d8bSDavid Heinzelmann * USB-3 connections are initialized automatically by 5373a4f55d8bSDavid Heinzelmann * the hostcontroller hardware. Therefore check for 5374a4f55d8bSDavid Heinzelmann * changed device descriptors before resuscitating the 5375a4f55d8bSDavid Heinzelmann * device. 5376a4f55d8bSDavid Heinzelmann */ 5377a4f55d8bSDavid Heinzelmann descriptor = udev->descriptor; 5378a4f55d8bSDavid Heinzelmann retval = usb_get_device_descriptor(udev, 5379a4f55d8bSDavid Heinzelmann sizeof(udev->descriptor)); 5380a4f55d8bSDavid Heinzelmann if (retval < 0) { 5381a4f55d8bSDavid Heinzelmann dev_dbg(&udev->dev, 5382a4f55d8bSDavid Heinzelmann "can't read device descriptor %d\n", 5383a4f55d8bSDavid Heinzelmann retval); 5384a4f55d8bSDavid Heinzelmann } else { 5385a4f55d8bSDavid Heinzelmann if (descriptors_changed(udev, &descriptor, 5386a4f55d8bSDavid Heinzelmann udev->bos)) { 5387a4f55d8bSDavid Heinzelmann dev_dbg(&udev->dev, 5388a4f55d8bSDavid Heinzelmann "device descriptor has changed\n"); 5389a4f55d8bSDavid Heinzelmann /* for disconnect() calls */ 5390a4f55d8bSDavid Heinzelmann udev->descriptor = descriptor; 5391a4f55d8bSDavid Heinzelmann } else { 5392af376a46SDan Williams status = 0; /* Nothing to do */ 5393a4f55d8bSDavid Heinzelmann } 5394a4f55d8bSDavid Heinzelmann } 5395ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 5396af376a46SDan Williams } else if (udev->state == USB_STATE_SUSPENDED && 5397af376a46SDan Williams udev->persist_enabled) { 5398af376a46SDan Williams /* For a suspended device, treat this as a 5399af376a46SDan Williams * remote wakeup event. 5400af376a46SDan Williams */ 54015c79a1e3SDan Williams usb_unlock_port(port_dev); 5402af376a46SDan Williams status = usb_remote_wakeup(udev); 54035c79a1e3SDan Williams usb_lock_port(port_dev); 5404af376a46SDan Williams #endif 5405af376a46SDan Williams } else { 5406af376a46SDan Williams /* Don't resuscitate */; 5407af376a46SDan Williams } 5408af376a46SDan Williams } 5409af376a46SDan Williams clear_bit(port1, hub->change_bits); 5410af376a46SDan Williams 54115c79a1e3SDan Williams /* successfully revalidated the connection */ 5412af376a46SDan Williams if (status == 0) 5413af376a46SDan Williams return; 5414af376a46SDan Williams 54155c79a1e3SDan Williams usb_unlock_port(port_dev); 5416af376a46SDan Williams hub_port_connect(hub, port1, portstatus, portchange); 54175c79a1e3SDan Williams usb_lock_port(port_dev); 54181da177e4SLinus Torvalds } 54191da177e4SLinus Torvalds 5420201af55dSJon Flatley /* Handle notifying userspace about hub over-current events */ 5421201af55dSJon Flatley static void port_over_current_notify(struct usb_port *port_dev) 5422201af55dSJon Flatley { 5423d81bb019SAlan Stern char *envp[3]; 5424201af55dSJon Flatley struct device *hub_dev; 5425201af55dSJon Flatley char *port_dev_path; 5426201af55dSJon Flatley 5427201af55dSJon Flatley sysfs_notify(&port_dev->dev.kobj, NULL, "over_current_count"); 5428201af55dSJon Flatley 5429201af55dSJon Flatley hub_dev = port_dev->dev.parent; 5430201af55dSJon Flatley 5431201af55dSJon Flatley if (!hub_dev) 5432201af55dSJon Flatley return; 5433201af55dSJon Flatley 5434201af55dSJon Flatley port_dev_path = kobject_get_path(&port_dev->dev.kobj, GFP_KERNEL); 5435201af55dSJon Flatley if (!port_dev_path) 5436201af55dSJon Flatley return; 5437201af55dSJon Flatley 5438201af55dSJon Flatley envp[0] = kasprintf(GFP_KERNEL, "OVER_CURRENT_PORT=%s", port_dev_path); 5439201af55dSJon Flatley if (!envp[0]) 5440bf7f547eSColin Ian King goto exit_path; 5441201af55dSJon Flatley 5442201af55dSJon Flatley envp[1] = kasprintf(GFP_KERNEL, "OVER_CURRENT_COUNT=%u", 5443201af55dSJon Flatley port_dev->over_current_count); 5444201af55dSJon Flatley if (!envp[1]) 5445201af55dSJon Flatley goto exit; 5446201af55dSJon Flatley 5447d81bb019SAlan Stern envp[2] = NULL; 5448201af55dSJon Flatley kobject_uevent_env(&hub_dev->kobj, KOBJ_CHANGE, envp); 5449201af55dSJon Flatley 5450201af55dSJon Flatley kfree(envp[1]); 5451201af55dSJon Flatley exit: 5452201af55dSJon Flatley kfree(envp[0]); 5453bf7f547eSColin Ian King exit_path: 5454bf7f547eSColin Ian King kfree(port_dev_path); 5455201af55dSJon Flatley } 5456201af55dSJon Flatley 5457af376a46SDan Williams static void port_event(struct usb_hub *hub, int port1) 54585c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 5459af376a46SDan Williams { 54607671bd1eSZhuang Jin Can int connect_change; 5461af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 5462af376a46SDan Williams struct usb_device *udev = port_dev->child; 5463af376a46SDan Williams struct usb_device *hdev = hub->hdev; 5464af376a46SDan Williams u16 portstatus, portchange; 5465af376a46SDan Williams 5466af376a46SDan Williams connect_change = test_bit(port1, hub->change_bits); 5467af376a46SDan Williams clear_bit(port1, hub->event_bits); 5468af376a46SDan Williams clear_bit(port1, hub->wakeup_bits); 5469af376a46SDan Williams 5470af376a46SDan Williams if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) 5471af376a46SDan Williams return; 5472af376a46SDan Williams 5473af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONNECTION) { 5474af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); 5475714b07beSSarah Sharp connect_change = 1; 5476714b07beSSarah Sharp } 5477af376a46SDan Williams 5478af376a46SDan Williams if (portchange & USB_PORT_STAT_C_ENABLE) { 5479af376a46SDan Williams if (!connect_change) 5480af376a46SDan Williams dev_dbg(&port_dev->dev, "enable change, status %08x\n", 5481af376a46SDan Williams portstatus); 5482af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); 5483af376a46SDan Williams 5484af376a46SDan Williams /* 5485af376a46SDan Williams * EM interference sometimes causes badly shielded USB devices 5486af376a46SDan Williams * to be shutdown by the hub, this hack enables them again. 5487af376a46SDan Williams * Works at least with mouse driver. 5488af376a46SDan Williams */ 5489af376a46SDan Williams if (!(portstatus & USB_PORT_STAT_ENABLE) 5490af376a46SDan Williams && !connect_change && udev) { 5491af376a46SDan Williams dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); 5492af376a46SDan Williams connect_change = 1; 5493714b07beSSarah Sharp } 5494af376a46SDan Williams } 5495af376a46SDan Williams 5496af376a46SDan Williams if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 5497af376a46SDan Williams u16 status = 0, unused; 54981cbd53c8SRichard Leitner port_dev->over_current_count++; 5499201af55dSJon Flatley port_over_current_notify(port_dev); 5500af376a46SDan Williams 55011cbd53c8SRichard Leitner dev_dbg(&port_dev->dev, "over-current change #%u\n", 55021cbd53c8SRichard Leitner port_dev->over_current_count); 5503af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5504af376a46SDan Williams USB_PORT_FEAT_C_OVER_CURRENT); 5505af376a46SDan Williams msleep(100); /* Cool down */ 5506af376a46SDan Williams hub_power_on(hub, true); 5507af376a46SDan Williams hub_port_status(hub, port1, &status, &unused); 5508af376a46SDan Williams if (status & USB_PORT_STAT_OVERCURRENT) 5509af376a46SDan Williams dev_err(&port_dev->dev, "over-current condition\n"); 5510af376a46SDan Williams } 5511af376a46SDan Williams 5512af376a46SDan Williams if (portchange & USB_PORT_STAT_C_RESET) { 5513af376a46SDan Williams dev_dbg(&port_dev->dev, "reset change\n"); 5514af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); 5515af376a46SDan Williams } 5516af376a46SDan Williams if ((portchange & USB_PORT_STAT_C_BH_RESET) 5517af376a46SDan Williams && hub_is_superspeed(hdev)) { 5518af376a46SDan Williams dev_dbg(&port_dev->dev, "warm reset change\n"); 5519af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5520af376a46SDan Williams USB_PORT_FEAT_C_BH_PORT_RESET); 5521af376a46SDan Williams } 5522af376a46SDan Williams if (portchange & USB_PORT_STAT_C_LINK_STATE) { 5523af376a46SDan Williams dev_dbg(&port_dev->dev, "link state change\n"); 5524af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5525af376a46SDan Williams USB_PORT_FEAT_C_PORT_LINK_STATE); 5526af376a46SDan Williams } 5527af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 5528af376a46SDan Williams dev_warn(&port_dev->dev, "config error\n"); 5529af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5530af376a46SDan Williams USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 5531af376a46SDan Williams } 5532af376a46SDan Williams 5533097a155fSDan Williams /* skip port actions that require the port to be powered on */ 5534097a155fSDan Williams if (!pm_runtime_active(&port_dev->dev)) 5535097a155fSDan Williams return; 5536097a155fSDan Williams 5537af376a46SDan Williams if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) 5538af376a46SDan Williams connect_change = 1; 5539af376a46SDan Williams 5540af376a46SDan Williams /* 5541af376a46SDan Williams * Warm reset a USB3 protocol port if it's in 5542af376a46SDan Williams * SS.Inactive state. 5543af376a46SDan Williams */ 55443cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) { 5545af376a46SDan Williams dev_dbg(&port_dev->dev, "do warm reset\n"); 5546af376a46SDan Williams if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) 5547af376a46SDan Williams || udev->state == USB_STATE_NOTATTACHED) { 5548af376a46SDan Williams if (hub_port_reset(hub, port1, NULL, 5549af376a46SDan Williams HUB_BH_RESET_TIME, true) < 0) 5550af376a46SDan Williams hub_port_disable(hub, port1, 1); 55517671bd1eSZhuang Jin Can } else { 55525c79a1e3SDan Williams usb_unlock_port(port_dev); 5553af376a46SDan Williams usb_lock_device(udev); 5554af376a46SDan Williams usb_reset_device(udev); 5555af376a46SDan Williams usb_unlock_device(udev); 55565c79a1e3SDan Williams usb_lock_port(port_dev); 5557af376a46SDan Williams connect_change = 0; 5558af376a46SDan Williams } 55597671bd1eSZhuang Jin Can } 5560af376a46SDan Williams 5561af376a46SDan Williams if (connect_change) 5562af376a46SDan Williams hub_port_connect_change(hub, port1, portstatus, portchange); 5563af376a46SDan Williams } 5564af376a46SDan Williams 556532a69589SPetr Mladek static void hub_event(struct work_struct *work) 55661da177e4SLinus Torvalds { 55671da177e4SLinus Torvalds struct usb_device *hdev; 55681da177e4SLinus Torvalds struct usb_interface *intf; 55691da177e4SLinus Torvalds struct usb_hub *hub; 55701da177e4SLinus Torvalds struct device *hub_dev; 55711da177e4SLinus Torvalds u16 hubstatus; 55721da177e4SLinus Torvalds u16 hubchange; 55731da177e4SLinus Torvalds int i, ret; 55741da177e4SLinus Torvalds 557532a69589SPetr Mladek hub = container_of(work, struct usb_hub, events); 55765d14f323SPetr Mladek hdev = hub->hdev; 5577e8054854SAlan Stern hub_dev = hub->intfdev; 5578e8054854SAlan Stern intf = to_usb_interface(hub_dev); 557932a69589SPetr Mladek 558095d23dc2SAndrey Konovalov kcov_remote_start_usb((u64)hdev->bus->busnum); 558195d23dc2SAndrey Konovalov 558240f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 55833bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 55841da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 55851da177e4SLinus Torvalds (u16) hub->change_bits[0], 558640f122f3SAlan Stern (u16) hub->event_bits[0]); 55871da177e4SLinus Torvalds 55881da177e4SLinus Torvalds /* Lock the device, then check to see if we were 55891da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 559006b84e8aSAlan Stern usb_lock_device(hdev); 5591e8054854SAlan Stern if (unlikely(hub->disconnected)) 559232a69589SPetr Mladek goto out_hdev_lock; 55931da177e4SLinus Torvalds 55941da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 55951da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 55967de18d8bSAlan Stern hub->error = -ENODEV; 55974330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 559832a69589SPetr Mladek goto out_hdev_lock; 55991da177e4SLinus Torvalds } 56001da177e4SLinus Torvalds 560140f122f3SAlan Stern /* Autoresume */ 560240f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 560340f122f3SAlan Stern if (ret) { 560440f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 560532a69589SPetr Mladek goto out_hdev_lock; 560640f122f3SAlan Stern } 560740f122f3SAlan Stern 560840f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 560940f122f3SAlan Stern if (hub->quiescing) 5610eb6e2924SPetr Mladek goto out_autopm; 56111da177e4SLinus Torvalds 56121da177e4SLinus Torvalds if (hub->error) { 5613eb6e2924SPetr Mladek dev_dbg(hub_dev, "resetting for error %d\n", hub->error); 56141da177e4SLinus Torvalds 5615742120c6SMing Lei ret = usb_reset_device(hdev); 56161da177e4SLinus Torvalds if (ret) { 5617eb6e2924SPetr Mladek dev_dbg(hub_dev, "error resetting hub: %d\n", ret); 5618eb6e2924SPetr Mladek goto out_autopm; 56191da177e4SLinus Torvalds } 56201da177e4SLinus Torvalds 56211da177e4SLinus Torvalds hub->nerrors = 0; 56221da177e4SLinus Torvalds hub->error = 0; 56231da177e4SLinus Torvalds } 56241da177e4SLinus Torvalds 56251da177e4SLinus Torvalds /* deal with port status changes */ 56263bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 5627097a155fSDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5628a82b76f7SHans de Goede 56295c79a1e3SDan Williams if (test_bit(i, hub->event_bits) 5630af376a46SDan Williams || test_bit(i, hub->change_bits) 56315c79a1e3SDan Williams || test_bit(i, hub->wakeup_bits)) { 56321da177e4SLinus Torvalds /* 5633097a155fSDan Williams * The get_noresume and barrier ensure that if 5634097a155fSDan Williams * the port was in the process of resuming, we 5635097a155fSDan Williams * flush that work and keep the port active for 5636097a155fSDan Williams * the duration of the port_event(). However, 5637097a155fSDan Williams * if the port is runtime pm suspended 5638097a155fSDan Williams * (powered-off), we leave it in that state, run 5639097a155fSDan Williams * an abbreviated port_event(), and move on. 56401da177e4SLinus Torvalds */ 5641097a155fSDan Williams pm_runtime_get_noresume(&port_dev->dev); 5642097a155fSDan Williams pm_runtime_barrier(&port_dev->dev); 56435c79a1e3SDan Williams usb_lock_port(port_dev); 5644af376a46SDan Williams port_event(hub, i); 56455c79a1e3SDan Williams usb_unlock_port(port_dev); 5646097a155fSDan Williams pm_runtime_put_sync(&port_dev->dev); 56471da177e4SLinus Torvalds } 56481da177e4SLinus Torvalds } 56491da177e4SLinus Torvalds 56501da177e4SLinus Torvalds /* deal with hub status changes */ 56511da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 56521da177e4SLinus Torvalds ; /* do nothing */ 56531da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 56541da177e4SLinus Torvalds dev_err(hub_dev, "get_hub_status failed\n"); 56551da177e4SLinus Torvalds else { 56561da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 56571da177e4SLinus Torvalds dev_dbg(hub_dev, "power change\n"); 56581da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 565955c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 566055c52718SAlan Stern /* FIXME: Is this always true? */ 566155c52718SAlan Stern hub->limited_power = 1; 5662403fae78Sjidong xiao else 5663403fae78Sjidong xiao hub->limited_power = 0; 56641da177e4SLinus Torvalds } 56651da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 5666752d57a8SPaul Bolle u16 status = 0; 5667752d57a8SPaul Bolle u16 unused; 5668752d57a8SPaul Bolle 5669752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 56701da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 5671752d57a8SPaul Bolle msleep(500); /* Cool down */ 56728520f380SAlan Stern hub_power_on(hub, true); 5673752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 5674752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 5675eb6e2924SPetr Mladek dev_err(hub_dev, "over-current condition\n"); 56761da177e4SLinus Torvalds } 56771da177e4SLinus Torvalds } 56781da177e4SLinus Torvalds 5679eb6e2924SPetr Mladek out_autopm: 56808e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 56818e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 568232a69589SPetr Mladek out_hdev_lock: 56831da177e4SLinus Torvalds usb_unlock_device(hdev); 568432a69589SPetr Mladek 568532a69589SPetr Mladek /* Balance the stuff in kick_hub_wq() and allow autosuspend */ 568632a69589SPetr Mladek usb_autopm_put_interface(intf); 5687e8054854SAlan Stern kref_put(&hub->kref, hub_release); 568895d23dc2SAndrey Konovalov 568995d23dc2SAndrey Konovalov kcov_remote_stop(); 56901da177e4SLinus Torvalds } 56911da177e4SLinus Torvalds 56921e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 569376e1ef1dSEugeniu Rosca { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 569476e1ef1dSEugeniu Rosca | USB_DEVICE_ID_MATCH_PRODUCT 569576e1ef1dSEugeniu Rosca | USB_DEVICE_ID_MATCH_INT_CLASS, 56961208f9e1SHardik Gajjar .idVendor = USB_VENDOR_SMSC, 569776e1ef1dSEugeniu Rosca .idProduct = USB_PRODUCT_USB5534B, 56981208f9e1SHardik Gajjar .bInterfaceClass = USB_CLASS_HUB, 56991208f9e1SHardik Gajjar .driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND}, 5700e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 5701e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 5702e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 5703e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 5704e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 57051da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 57061da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 57071da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 57081da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 57091da177e4SLinus Torvalds { } /* Terminating entry */ 57101da177e4SLinus Torvalds }; 57111da177e4SLinus Torvalds 57121da177e4SLinus Torvalds MODULE_DEVICE_TABLE(usb, hub_id_table); 57131da177e4SLinus Torvalds 57141da177e4SLinus Torvalds static struct usb_driver hub_driver = { 57151da177e4SLinus Torvalds .name = "hub", 57161da177e4SLinus Torvalds .probe = hub_probe, 57171da177e4SLinus Torvalds .disconnect = hub_disconnect, 57181da177e4SLinus Torvalds .suspend = hub_suspend, 57191da177e4SLinus Torvalds .resume = hub_resume, 5720f07600cfSAlan Stern .reset_resume = hub_reset_resume, 57217de18d8bSAlan Stern .pre_reset = hub_pre_reset, 57227de18d8bSAlan Stern .post_reset = hub_post_reset, 5723c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 57241da177e4SLinus Torvalds .id_table = hub_id_table, 572540f122f3SAlan Stern .supports_autosuspend = 1, 57261da177e4SLinus Torvalds }; 57271da177e4SLinus Torvalds 57281da177e4SLinus Torvalds int usb_hub_init(void) 57291da177e4SLinus Torvalds { 57301da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 57311da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 57321da177e4SLinus Torvalds usbcore_name); 57331da177e4SLinus Torvalds return -1; 57341da177e4SLinus Torvalds } 57351da177e4SLinus Torvalds 573632a69589SPetr Mladek /* 573732a69589SPetr Mladek * The workqueue needs to be freezable to avoid interfering with 573832a69589SPetr Mladek * USB-PERSIST port handover. Otherwise it might see that a full-speed 573932a69589SPetr Mladek * device was gone before the EHCI controller had handed its port 574032a69589SPetr Mladek * over to the companion full-speed controller. 574132a69589SPetr Mladek */ 5742638139ebSPetr Mladek hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); 574332a69589SPetr Mladek if (hub_wq) 57441da177e4SLinus Torvalds return 0; 57451da177e4SLinus Torvalds 57461da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 57471da177e4SLinus Torvalds usb_deregister(&hub_driver); 574832a69589SPetr Mladek pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); 57491da177e4SLinus Torvalds 57501da177e4SLinus Torvalds return -1; 57511da177e4SLinus Torvalds } 57521da177e4SLinus Torvalds 57531da177e4SLinus Torvalds void usb_hub_cleanup(void) 57541da177e4SLinus Torvalds { 575532a69589SPetr Mladek destroy_workqueue(hub_wq); 57561da177e4SLinus Torvalds 57571da177e4SLinus Torvalds /* 57581da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 57591da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 57601da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 57611da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 57621da177e4SLinus Torvalds * individual hub resources. -greg 57631da177e4SLinus Torvalds */ 57641da177e4SLinus Torvalds usb_deregister(&hub_driver); 57651da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 57661da177e4SLinus Torvalds 57671da177e4SLinus Torvalds /** 5768742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 57691da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 57701da177e4SLinus Torvalds * 577179efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 577279efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5773742120c6SMing Lei * Use usb_reset_device() instead. 57741da177e4SLinus Torvalds * 57751da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 57761da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 57771da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 57781da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 577937ebb549SPetr Mladek * telling hub_wq to pretend the device has been disconnected and then 57801da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 57811da177e4SLinus Torvalds * re-enumerated and probed all over again. 57821da177e4SLinus Torvalds * 5783626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 57841da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 57851da177e4SLinus Torvalds * if the reset wasn't even attempted. 57861da177e4SLinus Torvalds * 5787626f090cSYacine Belkadi * Note: 57885c79a1e3SDan Williams * The caller must own the device lock and the port lock, the latter is 57895c79a1e3SDan Williams * taken by usb_reset_device(). For example, it's safe to use 57905c79a1e3SDan Williams * usb_reset_device() from a driver probe() routine after downloading 57915c79a1e3SDan Williams * new firmware. For calls that might not occur during probe(), drivers 57925c79a1e3SDan Williams * should lock the device using usb_lock_device_for_reset(). 57936bc6cff5SAlan Stern * 57946bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 57956bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 57966bc6cff5SAlan Stern * holding the device lock because these tasks should always call 57975c79a1e3SDan Williams * usb_autopm_resume_device(), thereby preventing any unwanted 57985c79a1e3SDan Williams * autoresume. The autoresume handler is expected to have already 57995c79a1e3SDan Williams * acquired the port lock before calling this routine. 58001da177e4SLinus Torvalds */ 5801742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 58021da177e4SLinus Torvalds { 58031da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 58041da177e4SLinus Torvalds struct usb_hub *parent_hub; 58053f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 58061da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5807e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 58087a7b562dSHans de Goede int i, j, ret = 0; 580912c3da34SAlan Stern int port1 = udev->portnum; 58101da177e4SLinus Torvalds 58111da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 58121da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 58131da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 58141da177e4SLinus Torvalds udev->state); 58151da177e4SLinus Torvalds return -EINVAL; 58161da177e4SLinus Torvalds } 58171da177e4SLinus Torvalds 58185c79a1e3SDan Williams if (!parent_hdev) 58191da177e4SLinus Torvalds return -EISDIR; 58205c79a1e3SDan Williams 5821ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 58221da177e4SLinus Torvalds 5823dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5824dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5825dcc01c08SSarah Sharp */ 58267529b257SKai-Heng Feng usb_disable_usb2_hardware_lpm(udev); 5827dcc01c08SSarah Sharp 582857edd462SMathias Nyman /* Disable LPM while we reset the device and reinstall the alt settings. 582957edd462SMathias Nyman * Device-initiated LPM, and system exit latency settings are cleared 583057edd462SMathias Nyman * when the device is reset, so we have to set them up again. 58316d1d0513SSarah Sharp */ 58326d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 58336d1d0513SSarah Sharp if (ret) { 58341ccc417eSJoe Perches dev_err(&udev->dev, "%s Failed to disable LPM\n", __func__); 5835464ad8c4SHans Yang goto re_enumerate_no_bos; 58366d1d0513SSarah Sharp } 58376d1d0513SSarah Sharp 5838464ad8c4SHans Yang bos = udev->bos; 5839e5bdfd50SGreg Kroah-Hartman udev->bos = NULL; 5840464ad8c4SHans Yang 584119502e69SAlan Stern for (i = 0; i < PORT_INIT_TRIES; ++i) { 58421da177e4SLinus Torvalds 58431da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 58441da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5845fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 58461da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5847dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 58481da177e4SLinus Torvalds break; 58491da177e4SLinus Torvalds } 5850d5cbad4bSAlan Stern 58511da177e4SLinus Torvalds if (ret < 0) 58521da177e4SLinus Torvalds goto re_enumerate; 58531da177e4SLinus Torvalds 58541da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5855e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 58561da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 58571da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 58581da177e4SLinus Torvalds goto re_enumerate; 58591da177e4SLinus Torvalds } 58601da177e4SLinus Torvalds 58614fe0387aSAlan Stern /* Restore the device's previous configuration */ 58621da177e4SLinus Torvalds if (!udev->actconfig) 58631da177e4SLinus Torvalds goto done; 58643f0479e0SSarah Sharp 5865d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 58663f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 58673f0479e0SSarah Sharp if (ret < 0) { 58683f0479e0SSarah Sharp dev_warn(&udev->dev, 58693f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 58703f0479e0SSarah Sharp "old configuration.\n"); 5871d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 58723f0479e0SSarah Sharp goto re_enumerate; 58733f0479e0SSarah Sharp } 58741da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 58751da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 58761da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 58771da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 58781da177e4SLinus Torvalds if (ret < 0) { 58791da177e4SLinus Torvalds dev_err(&udev->dev, 58801da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 58811da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5882d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 58831da177e4SLinus Torvalds goto re_enumerate; 58841da177e4SLinus Torvalds } 5885d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 58861da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 58871da177e4SLinus Torvalds 58884fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 58894fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 58904fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 58914fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 58924fe0387aSAlan Stern * endpoint state. 58934fe0387aSAlan Stern */ 58941da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 58953f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 58963f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 58971da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 58981da177e4SLinus Torvalds 58991da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 59004fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 59014fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 59024fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 59034fe0387aSAlan Stern ret = 0; 59044fe0387aSAlan Stern } else { 590504a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 590604a723eaSSarah Sharp * device has been reset, and it will have to use 590704a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 59083f0479e0SSarah Sharp */ 590904a723eaSSarah Sharp intf->resetting_device = 1; 59101da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 59111da177e4SLinus Torvalds desc->bAlternateSetting); 591204a723eaSSarah Sharp intf->resetting_device = 0; 59134fe0387aSAlan Stern } 59141da177e4SLinus Torvalds if (ret < 0) { 59151da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 59161da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 59171da177e4SLinus Torvalds desc->bInterfaceNumber, 59181da177e4SLinus Torvalds desc->bAlternateSetting, 59191da177e4SLinus Torvalds ret); 59201da177e4SLinus Torvalds goto re_enumerate; 59211da177e4SLinus Torvalds } 59227a7b562dSHans de Goede /* Resetting also frees any allocated streams */ 59237a7b562dSHans de Goede for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) 59247a7b562dSHans de Goede intf->cur_altsetting->endpoint[j].streams = 0; 59251da177e4SLinus Torvalds } 59261da177e4SLinus Torvalds 59271da177e4SLinus Torvalds done: 5928f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 59297529b257SKai-Heng Feng usb_enable_usb2_hardware_lpm(udev); 593078d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5931f74631e3SSarah Sharp usb_enable_ltm(udev); 5932e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5933e3376d6cSXenia Ragiadakou udev->bos = bos; 59341da177e4SLinus Torvalds return 0; 59351da177e4SLinus Torvalds 59361da177e4SLinus Torvalds re_enumerate: 5937e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5938e3376d6cSXenia Ragiadakou udev->bos = bos; 5939464ad8c4SHans Yang re_enumerate_no_bos: 5940464ad8c4SHans Yang /* LPM state doesn't matter when we're about to destroy the device. */ 5941464ad8c4SHans Yang hub_port_logical_disconnect(parent_hub, port1); 59421da177e4SLinus Torvalds return -ENODEV; 59431da177e4SLinus Torvalds } 59441da177e4SLinus Torvalds 59451da177e4SLinus Torvalds /** 59461da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 5947e76b3bf7SKai-Heng Feng * @udev: device to reset (not in NOTATTACHED state) 59481da177e4SLinus Torvalds * 594979efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 595079efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5951742120c6SMing Lei * the reset is over (using their post_reset method). 595279efa097SAlan Stern * 5953626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 595479efa097SAlan Stern * 5955626f090cSYacine Belkadi * Note: 595679efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 595779efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 595879efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5959742120c6SMing Lei * the device using usb_lock_device_for_reset(). 596079efa097SAlan Stern * 596179efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 596279efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 596379efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 596479efa097SAlan Stern * we attempt to unbind it and rebind afterward. 596579efa097SAlan Stern */ 5966742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 596779efa097SAlan Stern { 596879efa097SAlan Stern int ret; 5969852c4b43SAlan Stern int i; 59704d769defSMing Lei unsigned int noio_flag; 59715c79a1e3SDan Williams struct usb_port *port_dev; 597279efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 59735c79a1e3SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 597479efa097SAlan Stern 5975e76b3bf7SKai-Heng Feng if (udev->state == USB_STATE_NOTATTACHED) { 597679efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 597779efa097SAlan Stern udev->state); 597879efa097SAlan Stern return -EINVAL; 597979efa097SAlan Stern } 598079efa097SAlan Stern 59815c79a1e3SDan Williams if (!udev->parent) { 59825c79a1e3SDan Williams /* this requires hcd-specific logic; see ohci_restart() */ 59835c79a1e3SDan Williams dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 59845c79a1e3SDan Williams return -EISDIR; 59855c79a1e3SDan Williams } 59865c79a1e3SDan Williams 59875c79a1e3SDan Williams port_dev = hub->ports[udev->portnum - 1]; 59885c79a1e3SDan Williams 59894d769defSMing Lei /* 59904d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 59914d769defSMing Lei * context to avoid possible deadlock if usb mass 59924d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 59934d769defSMing Lei * is included in current configuration. The easist 59944d769defSMing Lei * approach is to do it for every device reset, 59954d769defSMing Lei * because the device 'memalloc_noio' flag may have 59964d769defSMing Lei * not been set before reseting the usb device. 59974d769defSMing Lei */ 59984d769defSMing Lei noio_flag = memalloc_noio_save(); 59994d769defSMing Lei 6000645daaabSAlan Stern /* Prevent autosuspend during the reset */ 600194fcda1fSAlan Stern usb_autoresume_device(udev); 6002645daaabSAlan Stern 600379efa097SAlan Stern if (config) { 6004852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 6005852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 600679efa097SAlan Stern struct usb_driver *drv; 600778d9a487SAlan Stern int unbind = 0; 600879efa097SAlan Stern 6009852c4b43SAlan Stern if (cintf->dev.driver) { 601079efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 601178d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 601278d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 601378d9a487SAlan Stern else if (cintf->condition == 601478d9a487SAlan Stern USB_INTERFACE_BOUND) 601578d9a487SAlan Stern unbind = 1; 601678d9a487SAlan Stern if (unbind) 601778d9a487SAlan Stern usb_forced_unbind_intf(cintf); 601879efa097SAlan Stern } 601979efa097SAlan Stern } 602079efa097SAlan Stern } 602179efa097SAlan Stern 60225c79a1e3SDan Williams usb_lock_port(port_dev); 6023742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 60245c79a1e3SDan Williams usb_unlock_port(port_dev); 602579efa097SAlan Stern 602679efa097SAlan Stern if (config) { 6027852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 6028852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 602979efa097SAlan Stern struct usb_driver *drv; 603078d9a487SAlan Stern int rebind = cintf->needs_binding; 603179efa097SAlan Stern 603278d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 603379efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 603479efa097SAlan Stern if (drv->post_reset) 603578d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 603678d9a487SAlan Stern else if (cintf->condition == 603778d9a487SAlan Stern USB_INTERFACE_BOUND) 603878d9a487SAlan Stern rebind = 1; 60396aec044cSAlan Stern if (rebind) 60406aec044cSAlan Stern cintf->needs_binding = 1; 604179efa097SAlan Stern } 604279efa097SAlan Stern } 6043381419faSAlan Stern 6044381419faSAlan Stern /* If the reset failed, hub_wq will unbind drivers later */ 6045381419faSAlan Stern if (ret == 0) 60466aec044cSAlan Stern usb_unbind_and_rebind_marked_interfaces(udev); 604779efa097SAlan Stern } 604879efa097SAlan Stern 604994fcda1fSAlan Stern usb_autosuspend_device(udev); 60504d769defSMing Lei memalloc_noio_restore(noio_flag); 605179efa097SAlan Stern return ret; 605279efa097SAlan Stern } 6053742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 6054dc023dceSInaky Perez-Gonzalez 6055dc023dceSInaky Perez-Gonzalez 6056dc023dceSInaky Perez-Gonzalez /** 6057dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 6058dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 6059dc023dceSInaky Perez-Gonzalez * 6060dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 6061dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 6062dc023dceSInaky Perez-Gonzalez * 6063dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 6064dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 6065dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 6066dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 6067dc023dceSInaky Perez-Gonzalez * 6068dc023dceSInaky Perez-Gonzalez * Corner cases: 6069dc023dceSInaky Perez-Gonzalez * 6070dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 6071dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 6072dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 6073dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 6074dc023dceSInaky Perez-Gonzalez * 6075524134d4SAlan Stern * - If the reset is delayed so long that the interface is unbound from 6076524134d4SAlan Stern * its driver, the reset will be skipped. 6077dc023dceSInaky Perez-Gonzalez * 6078524134d4SAlan Stern * - This function can be called during .probe(). It can also be called 6079524134d4SAlan Stern * during .disconnect(), but doing so is pointless because the reset 6080524134d4SAlan Stern * will not occur. If you really want to reset the device during 6081524134d4SAlan Stern * .disconnect(), call usb_reset_device() directly -- but watch out 6082524134d4SAlan Stern * for nested unbinding issues! 6083dc023dceSInaky Perez-Gonzalez */ 6084dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 6085dc023dceSInaky Perez-Gonzalez { 6086524134d4SAlan Stern if (schedule_work(&iface->reset_ws)) 6087524134d4SAlan Stern usb_get_intf(iface); 6088dc023dceSInaky Perez-Gonzalez } 6089dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 6090ff823c79SLan Tianyu 6091ff823c79SLan Tianyu /** 6092ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 6093ff823c79SLan Tianyu * attached to the port which is specified by @port1. 6094ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 6095ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 6096ff823c79SLan Tianyu * is attached to. 6097ff823c79SLan Tianyu * 6098ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 6099ff823c79SLan Tianyu * pointer. 6100ff823c79SLan Tianyu * 6101626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 6102ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 6103ff823c79SLan Tianyu */ 6104ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 6105ff823c79SLan Tianyu int port1) 6106ff823c79SLan Tianyu { 6107ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 6108ff823c79SLan Tianyu 6109ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 6110ff823c79SLan Tianyu return NULL; 6111ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 6112ff823c79SLan Tianyu } 6113ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 6114d5575424SLan Tianyu 6115d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 6116d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 6117d2123fd9SLan Tianyu { 6118d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 6119d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 6120d2123fd9SLan Tianyu int i; 6121d2123fd9SLan Tianyu 6122d99f6b41SDan Williams if (!hub) 6123d99f6b41SDan Williams return; 6124d99f6b41SDan Williams 6125d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 6126d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 6127d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 6128d2123fd9SLan Tianyu 6129d99f6b41SDan Williams connect_type = port_dev->connect_type; 6130d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 6131d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 6132d2123fd9SLan Tianyu 6133d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 6134d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 6135d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 6136d2123fd9SLan Tianyu } 6137d2123fd9SLan Tianyu } 6138d2123fd9SLan Tianyu } 6139d2123fd9SLan Tianyu } else { 6140d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 6141d2123fd9SLan Tianyu 6142d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 6143d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 6144d2123fd9SLan Tianyu 6145d99f6b41SDan Williams connect_type = port_dev->connect_type; 6146d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 6147d2123fd9SLan Tianyu u16 mask = 1 << i; 6148d2123fd9SLan Tianyu 6149d2123fd9SLan Tianyu if (!(port_removable & mask)) { 6150d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 6151d2123fd9SLan Tianyu port_removable |= mask; 6152d2123fd9SLan Tianyu } 6153d2123fd9SLan Tianyu } 6154d2123fd9SLan Tianyu } 6155d2123fd9SLan Tianyu 6156d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 6157d2123fd9SLan Tianyu } 6158d2123fd9SLan Tianyu } 6159d2123fd9SLan Tianyu 6160d5575424SLan Tianyu #ifdef CONFIG_ACPI 6161d5575424SLan Tianyu /** 6162d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 6163d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 6164d5575424SLan Tianyu * @port1: port num of the port 6165d5575424SLan Tianyu * 6166626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 6167626f090cSYacine Belkadi * invalid. 6168d5575424SLan Tianyu */ 6169d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 6170d5575424SLan Tianyu int port1) 6171d5575424SLan Tianyu { 6172ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 6173d5575424SLan Tianyu 617441341261SMathias Nyman if (!hub) 617541341261SMathias Nyman return NULL; 617641341261SMathias Nyman 61773a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 6178d5575424SLan Tianyu } 6179d5575424SLan Tianyu #endif 6180