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> 211da177e4SLinus Torvalds #include <linux/ioctl.h> 221da177e4SLinus Torvalds #include <linux/usb.h> 231da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 2427729aadSEric Lescouet #include <linux/usb/hcd.h> 25925aa46bSRichard Zhao #include <linux/usb/otg.h> 2693362a87SPhil Dibowitz #include <linux/usb/quirks.h> 2732a69589SPetr Mladek #include <linux/workqueue.h> 284186ecf8SArjan van de Ven #include <linux/mutex.h> 29b04b3156STheodore Ts'o #include <linux/random.h> 30ad493e5eSLan Tianyu #include <linux/pm_qos.h> 311da177e4SLinus Torvalds 327c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 331da177e4SLinus Torvalds #include <asm/byteorder.h> 341da177e4SLinus Torvalds 356e30d7cbSLan Tianyu #include "hub.h" 36026f3fcbSPeter Chen #include "otg_whitelist.h" 371da177e4SLinus Torvalds 38e6f30deaSMing Lei #define USB_VENDOR_GENESYS_LOGIC 0x05e3 39e6f30deaSMing Lei #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 40e6f30deaSMing Lei 41886ee36eSFelipe Balbi #define USB_TP_TRANSMISSION_DELAY 40 /* ns */ 42886ee36eSFelipe Balbi #define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */ 43886ee36eSFelipe Balbi 44fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 459ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 461da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 471da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 481da177e4SLinus Torvalds 4932a69589SPetr Mladek /* workqueue to process hub events */ 5032a69589SPetr Mladek static struct workqueue_struct *hub_wq; 5132a69589SPetr Mladek static void hub_event(struct work_struct *work); 521da177e4SLinus Torvalds 53d8521afeSDan Williams /* synchronize hub-port add/remove and peering operations */ 54d8521afeSDan Williams DEFINE_MUTEX(usb_port_peer_mutex); 55d8521afeSDan Williams 561da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 57a44007a4SSaurabh Sengar static bool blinkenlights; 581da177e4SLinus Torvalds module_param(blinkenlights, bool, S_IRUGO); 591da177e4SLinus Torvalds MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds /* 62fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 63fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 64fd7c519dSJaroslav Kysela */ 65fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 66fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 67fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 68b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 69b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 70b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 71fd7c519dSJaroslav Kysela 72fd7c519dSJaroslav Kysela /* 731da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 741da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 751da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 761da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 771da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 781da177e4SLinus Torvalds * following module parameters. 791da177e4SLinus Torvalds * 801da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 811da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 821da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 831da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 841da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 851da177e4SLinus Torvalds */ 86a44007a4SSaurabh Sengar static bool old_scheme_first; 871da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 881da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 891da177e4SLinus Torvalds "start with the old device initialization scheme"); 901da177e4SLinus Torvalds 9190ab5ee9SRusty Russell static bool use_both_schemes = 1; 921da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 931da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 941da177e4SLinus Torvalds "try the other device initialization scheme if the " 951da177e4SLinus Torvalds "first one fails"); 961da177e4SLinus Torvalds 9732fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 9832fe0198SAlan Stern * port reset on some companion controllers. 9932fe0198SAlan Stern */ 10032fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 10132fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 10232fe0198SAlan Stern 103ad493e5eSLan Tianyu #define HUB_DEBOUNCE_TIMEOUT 2000 104948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 105948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 106948fea37SAlan Stern 10732a69589SPetr Mladek static void hub_release(struct kref *kref); 108742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 1093bc02bceSGeert Uytterhoeven static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); 110742120c6SMing Lei 111131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1121da177e4SLinus Torvalds { 113d64aab0cSOliver Neukum if (hub_is_superspeedplus(hub->hdev)) 114d64aab0cSOliver Neukum return "10.0 Gb/s"; 115131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 116131dec34SSarah Sharp return "5.0 Gb/s"; 117288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1181da177e4SLinus Torvalds return "480 Mb/s"; 119288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1201da177e4SLinus Torvalds return "1.5 Mb/s"; 1211da177e4SLinus Torvalds else 1221da177e4SLinus Torvalds return "12 Mb/s"; 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 126ad493e5eSLan Tianyu struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) 1271da177e4SLinus Torvalds { 128ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 12925118084SAlan Stern return NULL; 1301da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1332d2a3167SLu Baolu int usb_device_supports_lpm(struct usb_device *udev) 134d9b2099cSSarah Sharp { 135ad87e032SAlan Stern /* Some devices have trouble with LPM */ 136ad87e032SAlan Stern if (udev->quirks & USB_QUIRK_NO_LPM) 137ad87e032SAlan Stern return 0; 138ad87e032SAlan Stern 139d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 140d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 141d9b2099cSSarah Sharp */ 142a8425292SRupesh Tatiya if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { 143d9b2099cSSarah Sharp if (udev->bos->ext_cap && 144d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 145d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 146d9b2099cSSarah Sharp return 1; 147d9b2099cSSarah Sharp return 0; 148d9b2099cSSarah Sharp } 14951e0a012SSarah Sharp 15025cd2882SSarah Sharp /* 15125cd2882SSarah Sharp * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. 15225cd2882SSarah Sharp * However, there are some that don't, and they set the U1/U2 exit 15325cd2882SSarah Sharp * latencies to zero. 15451e0a012SSarah Sharp */ 15551e0a012SSarah Sharp if (!udev->bos->ss_cap) { 15625cd2882SSarah Sharp dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); 157d9b2099cSSarah Sharp return 0; 158d9b2099cSSarah Sharp } 15951e0a012SSarah Sharp 16025cd2882SSarah Sharp if (udev->bos->ss_cap->bU1devExitLat == 0 && 16125cd2882SSarah Sharp udev->bos->ss_cap->bU2DevExitLat == 0) { 16225cd2882SSarah Sharp if (udev->parent) 16325cd2882SSarah Sharp dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); 16425cd2882SSarah Sharp else 16525cd2882SSarah Sharp dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); 16625cd2882SSarah Sharp return 0; 16725cd2882SSarah Sharp } 16825cd2882SSarah Sharp 16925cd2882SSarah Sharp if (!udev->parent || udev->parent->lpm_capable) 17025cd2882SSarah Sharp return 1; 17151e0a012SSarah Sharp return 0; 17251e0a012SSarah Sharp } 17351e0a012SSarah Sharp 17451e0a012SSarah Sharp /* 17551e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 17651e0a012SSarah Sharp * either U1 or U2. 17751e0a012SSarah Sharp */ 17851e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 17951e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 18051e0a012SSarah Sharp unsigned int udev_exit_latency, 18151e0a012SSarah Sharp struct usb_hub *hub, 18251e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 18351e0a012SSarah Sharp unsigned int hub_exit_latency) 18451e0a012SSarah Sharp { 18551e0a012SSarah Sharp unsigned int total_mel; 18651e0a012SSarah Sharp unsigned int device_mel; 18751e0a012SSarah Sharp unsigned int hub_mel; 18851e0a012SSarah Sharp 18951e0a012SSarah Sharp /* 19051e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 19151e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 19251e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 19351e0a012SSarah Sharp * bound for. 19451e0a012SSarah Sharp * 19551e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 19651e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 19751e0a012SSarah Sharp */ 19851e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 19951e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 20051e0a012SSarah Sharp 20151e0a012SSarah Sharp /* 20251e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 20351e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 20451e0a012SSarah Sharp * latency. 20551e0a012SSarah Sharp * 20651e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 20751e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 20851e0a012SSarah Sharp */ 20951e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 21051e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 21151e0a012SSarah Sharp if (device_mel > hub_mel) 21251e0a012SSarah Sharp total_mel += device_mel; 21351e0a012SSarah Sharp else 21451e0a012SSarah Sharp total_mel += hub_mel; 21551e0a012SSarah Sharp 21651e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 21751e0a012SSarah Sharp } 21851e0a012SSarah Sharp 21951e0a012SSarah Sharp /* 22051e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 22151e0a012SSarah Sharp * a transition from either U1 or U2. 22251e0a012SSarah Sharp */ 22351e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 22451e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 22551e0a012SSarah Sharp unsigned int udev_exit_latency, 22651e0a012SSarah Sharp struct usb_hub *hub, 22751e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 22851e0a012SSarah Sharp unsigned int hub_exit_latency, 22951e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 23051e0a012SSarah Sharp { 23151e0a012SSarah Sharp unsigned int first_link_pel; 23251e0a012SSarah Sharp unsigned int hub_pel; 23351e0a012SSarah Sharp 23451e0a012SSarah Sharp /* 23551e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 23651e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 23751e0a012SSarah Sharp * the device exit latency or the hub exit latency. 23851e0a012SSarah Sharp */ 23951e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 24051e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 24151e0a012SSarah Sharp else 24251e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 24351e0a012SSarah Sharp 24451e0a012SSarah Sharp /* 24551e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 24651e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 24751e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 24851e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 24951e0a012SSarah Sharp */ 25051e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 25151e0a012SSarah Sharp 25251e0a012SSarah Sharp /* 25351e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 25451e0a012SSarah Sharp * is the greater of the two exit latencies. 25551e0a012SSarah Sharp */ 25651e0a012SSarah Sharp if (first_link_pel > hub_pel) 25751e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 25851e0a012SSarah Sharp else 25951e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 26051e0a012SSarah Sharp } 26151e0a012SSarah Sharp 26251e0a012SSarah Sharp /* 26351e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 26451e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 26551e0a012SSarah Sharp * first packet from the host controller. 26651e0a012SSarah Sharp * 26751e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 26851e0a012SSarah Sharp * - t1: device PEL 26951e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 27051e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 27151e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 27251e0a012SSarah Sharp * 27351e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 27451e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 27551e0a012SSarah Sharp * vendor says otherwise. 27651e0a012SSarah Sharp */ 27751e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 27851e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 27951e0a012SSarah Sharp { 28051e0a012SSarah Sharp struct usb_device *parent; 28151e0a012SSarah Sharp unsigned int num_hubs; 28251e0a012SSarah Sharp unsigned int total_sel; 28351e0a012SSarah Sharp 28451e0a012SSarah Sharp /* t1 = device PEL */ 28551e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 28651e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 28751e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 28851e0a012SSarah Sharp parent = parent->parent) 28951e0a012SSarah Sharp num_hubs++; 29051e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 29151e0a012SSarah Sharp if (num_hubs > 0) 29251e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 29351e0a012SSarah Sharp 29451e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 29551e0a012SSarah Sharp total_sel += 250 * num_hubs; 29651e0a012SSarah Sharp 29751e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 29851e0a012SSarah Sharp } 29951e0a012SSarah Sharp 30051e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 30151e0a012SSarah Sharp { 30251e0a012SSarah Sharp struct usb_hub *hub; 30351e0a012SSarah Sharp unsigned int port_to_port_delay; 30451e0a012SSarah Sharp unsigned int udev_u1_del; 30551e0a012SSarah Sharp unsigned int udev_u2_del; 30651e0a012SSarah Sharp unsigned int hub_u1_del; 30751e0a012SSarah Sharp unsigned int hub_u2_del; 30851e0a012SSarah Sharp 3098a1b2725SMathias Nyman if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) 31051e0a012SSarah Sharp return; 31151e0a012SSarah Sharp 312ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 31351e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 31451e0a012SSarah Sharp * doesn't have an upstream link. 31551e0a012SSarah Sharp */ 31651e0a012SSarah Sharp if (!hub) 31751e0a012SSarah Sharp return; 31851e0a012SSarah Sharp 31951e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3204d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 32151e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3224d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 32351e0a012SSarah Sharp 32451e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 32551e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 32651e0a012SSarah Sharp 32751e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 32851e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 32951e0a012SSarah Sharp 33051e0a012SSarah Sharp /* 33151e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 33251e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 33351e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 33451e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 33551e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 33651e0a012SSarah Sharp * 33751e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 33851e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 33951e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 34051e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 34151e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 34251e0a012SSarah Sharp * exit latencies. 34351e0a012SSarah Sharp * 34451e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 34551e0a012SSarah Sharp * latency? It's possible, although not likely... 34651e0a012SSarah Sharp */ 34751e0a012SSarah Sharp port_to_port_delay = 1; 34851e0a012SSarah Sharp 34951e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 35051e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 35151e0a012SSarah Sharp port_to_port_delay); 35251e0a012SSarah Sharp 35351e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 35451e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 35551e0a012SSarah Sharp else 35651e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 35751e0a012SSarah Sharp 35851e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 35951e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 36051e0a012SSarah Sharp port_to_port_delay); 36151e0a012SSarah Sharp 36251e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 36351e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 36451e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 36551e0a012SSarah Sharp } 366d9b2099cSSarah Sharp 3671da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 368bec444cdSJohan Hovold static int get_hub_descriptor(struct usb_device *hdev, 369bec444cdSJohan Hovold struct usb_hub_descriptor *desc) 3701da177e4SLinus Torvalds { 371dbe79bbeSJohn Youn int i, ret, size; 372dbe79bbeSJohn Youn unsigned dtype; 373dbe79bbeSJohn Youn 374dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 375dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 376dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 377dbe79bbeSJohn Youn } else { 378dbe79bbeSJohn Youn dtype = USB_DT_HUB; 379dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 380dbe79bbeSJohn Youn } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3831da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3841da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 385bec444cdSJohan Hovold dtype << 8, 0, desc, size, 3861da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3872c25a2c8SJohan Hovold if (hub_is_superspeed(hdev)) { 3882c25a2c8SJohan Hovold if (ret == size) 3891da177e4SLinus Torvalds return ret; 390bec444cdSJohan Hovold } else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) { 391bec444cdSJohan Hovold /* Make sure we have the DeviceRemovable field. */ 392bec444cdSJohan Hovold size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1; 393bec444cdSJohan Hovold if (ret < size) 394bec444cdSJohan Hovold return -EMSGSIZE; 3952c25a2c8SJohan Hovold return ret; 3962c25a2c8SJohan Hovold } 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds return -EINVAL; 3991da177e4SLinus Torvalds } 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds /* 4021da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 4031da177e4SLinus Torvalds */ 4041da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 4051da177e4SLinus Torvalds { 4061da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4071da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds /* 4111da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 4121da177e4SLinus Torvalds */ 413ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 4141da177e4SLinus Torvalds { 4151da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4161da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4171da177e4SLinus Torvalds NULL, 0, 1000); 4181da177e4SLinus Torvalds } 4191da177e4SLinus Torvalds 4201da177e4SLinus Torvalds /* 4211da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4221da177e4SLinus Torvalds */ 4231da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4241da177e4SLinus Torvalds { 4251da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4261da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4271da177e4SLinus Torvalds NULL, 0, 1000); 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 430d99f6b41SDan Williams static char *to_led_name(int selector) 431d99f6b41SDan Williams { 432d99f6b41SDan Williams switch (selector) { 433d99f6b41SDan Williams case HUB_LED_AMBER: 434d99f6b41SDan Williams return "amber"; 435d99f6b41SDan Williams case HUB_LED_GREEN: 436d99f6b41SDan Williams return "green"; 437d99f6b41SDan Williams case HUB_LED_OFF: 438d99f6b41SDan Williams return "off"; 439d99f6b41SDan Williams case HUB_LED_AUTO: 440d99f6b41SDan Williams return "auto"; 441d99f6b41SDan Williams default: 442d99f6b41SDan Williams return "??"; 443d99f6b41SDan Williams } 444d99f6b41SDan Williams } 445d99f6b41SDan Williams 4461da177e4SLinus Torvalds /* 4471da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4481da177e4SLinus Torvalds * for info about using port indicators 4491da177e4SLinus Torvalds */ 450d99f6b41SDan Williams static void set_port_led(struct usb_hub *hub, int port1, int selector) 4511da177e4SLinus Torvalds { 452d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 453d99f6b41SDan Williams int status; 454d99f6b41SDan Williams 455d99f6b41SDan Williams status = set_port_feature(hub->hdev, (selector << 8) | port1, 4561da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 457d99f6b41SDan Williams dev_dbg(&port_dev->dev, "indicator %s status %d\n", 458d99f6b41SDan Williams to_led_name(selector), status); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4621da177e4SLinus Torvalds 463c4028958SDavid Howells static void led_work(struct work_struct *work) 4641da177e4SLinus Torvalds { 465c4028958SDavid Howells struct usb_hub *hub = 466c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4671da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4681da177e4SLinus Torvalds unsigned i; 4691da177e4SLinus Torvalds unsigned changed = 0; 4701da177e4SLinus Torvalds int cursor = -1; 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4731da177e4SLinus Torvalds return; 4741da177e4SLinus Torvalds 4753bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4761da177e4SLinus Torvalds unsigned selector, mode; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds switch (hub->indicator[i]) { 4811da177e4SLinus Torvalds /* cycle marker */ 4821da177e4SLinus Torvalds case INDICATOR_CYCLE: 4831da177e4SLinus Torvalds cursor = i; 4841da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4851da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4861da177e4SLinus Torvalds break; 4871da177e4SLinus Torvalds /* blinking green = sw attention */ 4881da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4891da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4901da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4911da177e4SLinus Torvalds break; 4921da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4931da177e4SLinus Torvalds selector = HUB_LED_OFF; 4941da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4951da177e4SLinus Torvalds break; 4961da177e4SLinus Torvalds /* blinking amber = hw attention */ 4971da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4981da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4991da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 5001da177e4SLinus Torvalds break; 5011da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 5021da177e4SLinus Torvalds selector = HUB_LED_OFF; 5031da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 5041da177e4SLinus Torvalds break; 5051da177e4SLinus Torvalds /* blink green/amber = reserved */ 5061da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 5071da177e4SLinus Torvalds selector = HUB_LED_GREEN; 5081da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 5091da177e4SLinus Torvalds break; 5101da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 5111da177e4SLinus Torvalds selector = HUB_LED_AMBER; 5121da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 5131da177e4SLinus Torvalds break; 5141da177e4SLinus Torvalds default: 5151da177e4SLinus Torvalds continue; 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 5181da177e4SLinus Torvalds changed = 1; 5191da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 5201da177e4SLinus Torvalds hub->indicator[i] = mode; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds if (!changed && blinkenlights) { 5231da177e4SLinus Torvalds cursor++; 5243bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5251da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5261da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5271da177e4SLinus Torvalds changed++; 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds if (changed) 53022f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 53122f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5351da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5361da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds /* 5391da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5401da177e4SLinus Torvalds */ 5411da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5421da177e4SLinus Torvalds struct usb_hub_status *data) 5431da177e4SLinus Torvalds { 5441da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5451da177e4SLinus Torvalds 5463824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5473824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5481da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5491da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5501da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds return status; 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5551da177e4SLinus Torvalds /* 5561da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5570cdd49a1SMathias Nyman * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 5581da177e4SLinus Torvalds */ 5591da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5600cdd49a1SMathias Nyman void *data, u16 value, u16 length) 5611da177e4SLinus Torvalds { 5621da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5631da177e4SLinus Torvalds 5643824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5653824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5661da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5670cdd49a1SMathias Nyman USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, 5680cdd49a1SMathias Nyman port1, data, length, USB_STS_TIMEOUT); 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds return status; 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds 5730cdd49a1SMathias Nyman static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, 5740cdd49a1SMathias Nyman u16 *status, u16 *change, u32 *ext_status) 5753eb14915SAlan Stern { 5763eb14915SAlan Stern int ret; 5770cdd49a1SMathias Nyman int len = 4; 5780cdd49a1SMathias Nyman 5790cdd49a1SMathias Nyman if (type != HUB_PORT_STATUS) 5800cdd49a1SMathias Nyman len = 8; 5813eb14915SAlan Stern 5823eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5830cdd49a1SMathias Nyman ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); 5840cdd49a1SMathias Nyman if (ret < len) { 585e9e88fb7SAlan Stern if (ret != -ENODEV) 5863eb14915SAlan Stern dev_err(hub->intfdev, 5873eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5883eb14915SAlan Stern if (ret >= 0) 5893eb14915SAlan Stern ret = -EIO; 5903eb14915SAlan Stern } else { 5913eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5923eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 5930cdd49a1SMathias Nyman if (type != HUB_PORT_STATUS && ext_status) 5940cdd49a1SMathias Nyman *ext_status = le32_to_cpu( 5950cdd49a1SMathias Nyman hub->status->port.dwExtPortStatus); 5963eb14915SAlan Stern ret = 0; 5973eb14915SAlan Stern } 5983eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5993eb14915SAlan Stern return ret; 6003eb14915SAlan Stern } 6013eb14915SAlan Stern 6020cdd49a1SMathias Nyman static int hub_port_status(struct usb_hub *hub, int port1, 6030cdd49a1SMathias Nyman u16 *status, u16 *change) 6040cdd49a1SMathias Nyman { 6050cdd49a1SMathias Nyman return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, 6060cdd49a1SMathias Nyman status, change, NULL); 6070cdd49a1SMathias Nyman } 6080cdd49a1SMathias Nyman 60932a69589SPetr Mladek static void kick_hub_wq(struct usb_hub *hub) 6101da177e4SLinus Torvalds { 61132a69589SPetr Mladek struct usb_interface *intf; 6121da177e4SLinus Torvalds 61332a69589SPetr Mladek if (hub->disconnected || work_pending(&hub->events)) 61432a69589SPetr Mladek return; 6158e4ceb38SAlan Stern 61632a69589SPetr Mladek /* 61732a69589SPetr Mladek * Suppress autosuspend until the event is proceed. 61832a69589SPetr Mladek * 61932a69589SPetr Mladek * Be careful and make sure that the symmetric operation is 62032a69589SPetr Mladek * always called. We are here only when there is no pending 62132a69589SPetr Mladek * work for this hub. Therefore put the interface either when 62232a69589SPetr Mladek * the new work is called or when it is canceled. 62332a69589SPetr Mladek */ 62432a69589SPetr Mladek intf = to_usb_interface(hub->intfdev); 62532a69589SPetr Mladek usb_autopm_get_interface_no_resume(intf); 62632a69589SPetr Mladek kref_get(&hub->kref); 62732a69589SPetr Mladek 62832a69589SPetr Mladek if (queue_work(hub_wq, &hub->events)) 62932a69589SPetr Mladek return; 63032a69589SPetr Mladek 63132a69589SPetr Mladek /* the work has already been scheduled */ 63232a69589SPetr Mladek usb_autopm_put_interface_async(intf); 63332a69589SPetr Mladek kref_put(&hub->kref, hub_release); 6341da177e4SLinus Torvalds } 6351da177e4SLinus Torvalds 63659d48b3fSPetr Mladek void usb_kick_hub_wq(struct usb_device *hdev) 6371da177e4SLinus Torvalds { 638ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 63925118084SAlan Stern 64025118084SAlan Stern if (hub) 64132a69589SPetr Mladek kick_hub_wq(hub); 6421da177e4SLinus Torvalds } 6431da177e4SLinus Torvalds 6444ee823b8SSarah Sharp /* 6454ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6464ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6474ee823b8SSarah Sharp * 6484ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6494ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6504ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6514ee823b8SSarah Sharp */ 6524ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6534ee823b8SSarah Sharp unsigned int portnum) 6544ee823b8SSarah Sharp { 6554ee823b8SSarah Sharp struct usb_hub *hub; 65683a62c51SRavi Chandra Sadineni struct usb_port *port_dev; 6574ee823b8SSarah Sharp 6584ee823b8SSarah Sharp if (!hdev) 6594ee823b8SSarah Sharp return; 6604ee823b8SSarah Sharp 661ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6624ee823b8SSarah Sharp if (hub) { 66383a62c51SRavi Chandra Sadineni port_dev = hub->ports[portnum - 1]; 66483a62c51SRavi Chandra Sadineni if (port_dev && port_dev->child) 66583a62c51SRavi Chandra Sadineni pm_wakeup_event(&port_dev->child->dev, 0); 66683a62c51SRavi Chandra Sadineni 6674ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 66832a69589SPetr Mladek kick_hub_wq(hub); 6694ee823b8SSarah Sharp } 6704ee823b8SSarah Sharp } 6714ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6747d12e780SDavid Howells static void hub_irq(struct urb *urb) 6751da177e4SLinus Torvalds { 676ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 677e015268dSAlan Stern int status = urb->status; 67871d2718fSRoel Kluin unsigned i; 6791da177e4SLinus Torvalds unsigned long bits; 6801da177e4SLinus Torvalds 681e015268dSAlan Stern switch (status) { 6821da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6831da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6841da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6851da177e4SLinus Torvalds return; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds default: /* presumably an error */ 6881da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 689e015268dSAlan Stern dev_dbg(hub->intfdev, "transfer --> %d\n", status); 6901da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6911da177e4SLinus Torvalds goto resubmit; 692e015268dSAlan Stern hub->error = status; 6931da177e4SLinus Torvalds /* FALL THROUGH */ 6941da177e4SLinus Torvalds 69537ebb549SPetr Mladek /* let hub_wq handle things */ 6961da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6971da177e4SLinus Torvalds bits = 0; 6981da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6991da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 7001da177e4SLinus Torvalds << (i*8); 7011da177e4SLinus Torvalds hub->event_bits[0] = bits; 7021da177e4SLinus Torvalds break; 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds hub->nerrors = 0; 7061da177e4SLinus Torvalds 70737ebb549SPetr Mladek /* Something happened, let hub_wq figure it out */ 70832a69589SPetr Mladek kick_hub_wq(hub); 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds resubmit: 7111da177e4SLinus Torvalds if (hub->quiescing) 7121da177e4SLinus Torvalds return; 7131da177e4SLinus Torvalds 714088a3daeSKris Borer status = usb_submit_urb(hub->urb, GFP_ATOMIC); 715088a3daeSKris Borer if (status != 0 && status != -ENODEV && status != -EPERM) 7161da177e4SLinus Torvalds dev_err(hub->intfdev, "resubmit --> %d\n", status); 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 7201da177e4SLinus Torvalds static inline int 7211da177e4SLinus Torvalds hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) 7221da177e4SLinus Torvalds { 7232c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 7242c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 7252c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 7262c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 7272c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 7282c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 7292c7b871bSWilliam Gulland if (status) 7302c7b871bSWilliam Gulland return status; 7312c7b871bSWilliam Gulland } 732c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 7331da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 7341da177e4SLinus Torvalds tt, NULL, 0, 1000); 7351da177e4SLinus Torvalds } 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds /* 73837ebb549SPetr Mladek * enumeration blocks hub_wq for a long time. we use keventd instead, since 7391da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 7401da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 7411da177e4SLinus Torvalds * both can talk to the same hub concurrently. 7421da177e4SLinus Torvalds */ 743cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 7441da177e4SLinus Torvalds { 745c4028958SDavid Howells struct usb_hub *hub = 746cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 7471da177e4SLinus Torvalds unsigned long flags; 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds spin_lock_irqsave(&hub->tt.lock, flags); 7503b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 751d0f830d3SH Hartley Sweeten struct list_head *next; 7521da177e4SLinus Torvalds struct usb_tt_clear *clear; 7531da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 754cb88a1b8SAlan Stern const struct hc_driver *drv; 7551da177e4SLinus Torvalds int status; 7561da177e4SLinus Torvalds 757d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 758d0f830d3SH Hartley Sweeten clear = list_entry(next, struct usb_tt_clear, clear_list); 7591da177e4SLinus Torvalds list_del(&clear->clear_list); 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7621da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7631da177e4SLinus Torvalds status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); 764e9e88fb7SAlan Stern if (status && status != -ENODEV) 7651da177e4SLinus Torvalds dev_err(&hdev->dev, 7661da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7671da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 768cb88a1b8SAlan Stern 769cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 770cb88a1b8SAlan Stern drv = clear->hcd->driver; 771cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 772cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 773cb88a1b8SAlan Stern 7741da177e4SLinus Torvalds kfree(clear); 775cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7761da177e4SLinus Torvalds } 7771da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7781da177e4SLinus Torvalds } 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvalds /** 781971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 78241341261SMathias Nyman * @hdev: USB device belonging to the usb hub 78341341261SMathias Nyman * @hub: target hub 784971fcd49SLan Tianyu * @port1: port index 785971fcd49SLan Tianyu * @set: expected status 786971fcd49SLan Tianyu * 787971fcd49SLan Tianyu * call this function to control port's power via setting or 788971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 789626f090cSYacine Belkadi * 790626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 791971fcd49SLan Tianyu */ 79241341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 79341341261SMathias Nyman int port1, bool set) 794971fcd49SLan Tianyu { 795971fcd49SLan Tianyu int ret; 796971fcd49SLan Tianyu 797971fcd49SLan Tianyu if (set) 798971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 799971fcd49SLan Tianyu else 800ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 801ad493e5eSLan Tianyu 802d5c3834eSDan Williams if (ret) 803971fcd49SLan Tianyu return ret; 804d5c3834eSDan Williams 805d5c3834eSDan Williams if (set) 806d5c3834eSDan Williams set_bit(port1, hub->power_bits); 807d5c3834eSDan Williams else 808d5c3834eSDan Williams clear_bit(port1, hub->power_bits); 809d5c3834eSDan Williams return 0; 810971fcd49SLan Tianyu } 811971fcd49SLan Tianyu 812971fcd49SLan Tianyu /** 813cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 814cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 8151da177e4SLinus Torvalds * 8161da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 8171da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 8181da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 8191da177e4SLinus Torvalds * interrupt context. 8201da177e4SLinus Torvalds * 8211da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 8221da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 823626f090cSYacine Belkadi * 824626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 8251da177e4SLinus Torvalds */ 826cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 8271da177e4SLinus Torvalds { 828cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 829cb88a1b8SAlan Stern int pipe = urb->pipe; 8301da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 8311da177e4SLinus Torvalds unsigned long flags; 8321da177e4SLinus Torvalds struct usb_tt_clear *clear; 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 8351da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 8361da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 8371da177e4SLinus Torvalds */ 838d544d273SGreg Kroah-Hartman clear = kmalloc(sizeof *clear, GFP_ATOMIC); 839d544d273SGreg Kroah-Hartman if (clear == NULL) { 8401da177e4SLinus Torvalds dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 8411da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 842cb88a1b8SAlan Stern return -ENOMEM; 8431da177e4SLinus Torvalds } 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 8461da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 8471da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 8481da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 8491da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol(pipe) 8501da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 8511da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 8521da177e4SLinus Torvalds if (usb_pipein(pipe)) 8531da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 8541da177e4SLinus Torvalds 855cb88a1b8SAlan Stern /* info for completion callback */ 856cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 857cb88a1b8SAlan Stern clear->ep = urb->ep; 858cb88a1b8SAlan Stern 8591da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8601da177e4SLinus Torvalds spin_lock_irqsave(&tt->lock, flags); 8611da177e4SLinus Torvalds list_add_tail(&clear->clear_list, &tt->clear_list); 862cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8631da177e4SLinus Torvalds spin_unlock_irqrestore(&tt->lock, flags); 864cb88a1b8SAlan Stern return 0; 8651da177e4SLinus Torvalds } 866cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8671da177e4SLinus Torvalds 8687ad3c470SDan Williams static void hub_power_on(struct usb_hub *hub, bool do_delay) 8691da177e4SLinus Torvalds { 8701da177e4SLinus Torvalds int port1; 8711da177e4SLinus Torvalds 8724489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8734489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8744489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8754489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8764489a571SAlan Stern * unless we send these messages to the hub. 8774489a571SAlan Stern */ 8789262c19dSDan Williams if (hub_is_port_power_switchable(hub)) 8791da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8804489a571SAlan Stern else 8814489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8824489a571SAlan Stern "non-switchable hub\n"); 8833bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 884d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 8854489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 886ad493e5eSLan Tianyu else 887ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 888ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8898520f380SAlan Stern if (do_delay) 8907ad3c470SDan Williams msleep(hub_power_on_good_delay(hub)); 8911da177e4SLinus Torvalds } 8921da177e4SLinus Torvalds 8931da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8941da177e4SLinus Torvalds u16 *status, u16 *change) 8951da177e4SLinus Torvalds { 8961da177e4SLinus Torvalds int ret; 8971da177e4SLinus Torvalds 898db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8991da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 900e9e88fb7SAlan Stern if (ret < 0) { 901e9e88fb7SAlan Stern if (ret != -ENODEV) 9021da177e4SLinus Torvalds dev_err(hub->intfdev, 903441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 904e9e88fb7SAlan Stern } else { 9051da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 9061da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 9071da177e4SLinus Torvalds ret = 0; 9081da177e4SLinus Torvalds } 909db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 9101da177e4SLinus Torvalds return ret; 9111da177e4SLinus Torvalds } 9121da177e4SLinus Torvalds 91341e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 91441e7e056SSarah Sharp unsigned int link_status) 91541e7e056SSarah Sharp { 91641e7e056SSarah Sharp return set_port_feature(hub->hdev, 91741e7e056SSarah Sharp port1 | (link_status << 3), 91841e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 91941e7e056SSarah Sharp } 92041e7e056SSarah Sharp 92141e7e056SSarah Sharp /* 9226d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 92337ebb549SPetr Mladek * time later hub_wq will disconnect() any existing usb_device on the port 9240458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9250458d5b4SAlan Stern */ 9260458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9277d069b7dSAlan Stern { 928d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); 9290458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9300458d5b4SAlan Stern 9310458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9320458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9330458d5b4SAlan Stern * - SRP saves power that way 9340458d5b4SAlan Stern * - ... new call, TBD ... 9350458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 93637ebb549SPetr Mladek * hub_wq reactivates the port later (timer, SRP, etc). 9370458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9380458d5b4SAlan Stern */ 9390458d5b4SAlan Stern 9400458d5b4SAlan Stern set_bit(port1, hub->change_bits); 94132a69589SPetr Mladek kick_hub_wq(hub); 9420458d5b4SAlan Stern } 9430458d5b4SAlan Stern 944253e0572SAlan Stern /** 945253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 946253e0572SAlan Stern * @udev: device to be disabled and removed 947253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 948253e0572SAlan Stern * 94937ebb549SPetr Mladek * After @udev's port has been disabled, hub_wq is notified and it will 950253e0572SAlan Stern * see that the device has been disconnected. When the device is 951253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 952253e0572SAlan Stern * be received and processed normally. 953626f090cSYacine Belkadi * 954626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 955253e0572SAlan Stern */ 956253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 957253e0572SAlan Stern { 958253e0572SAlan Stern struct usb_hub *hub; 959253e0572SAlan Stern struct usb_interface *intf; 960253e0572SAlan Stern 961253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 962253e0572SAlan Stern return -EINVAL; 963ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 964253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 965253e0572SAlan Stern 966253e0572SAlan Stern usb_autopm_get_interface(intf); 967253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 968253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 969253e0572SAlan Stern usb_autopm_put_interface(intf); 970253e0572SAlan Stern return 0; 971253e0572SAlan Stern } 972253e0572SAlan Stern 9736ee0b270SAlan Stern enum hub_activation_type { 9748e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9758520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9766ee0b270SAlan Stern }; 9775e6effaeSAlan Stern 9788520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 9798520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 9808520f380SAlan Stern 981f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 9825e6effaeSAlan Stern { 9835e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 984653a39d1SSarah Sharp struct usb_hcd *hcd; 985653a39d1SSarah Sharp int ret; 9865e6effaeSAlan Stern int port1; 987f2835219SAlan Stern int status; 988948fea37SAlan Stern bool need_debounce_delay = false; 9898520f380SAlan Stern unsigned delay; 9908520f380SAlan Stern 9918520f380SAlan Stern /* Continue a partial initialization */ 992e50293efSAlan Stern if (type == HUB_INIT2 || type == HUB_INIT3) { 99307d316a2SAlan Stern device_lock(&hdev->dev); 994e50293efSAlan Stern 995e50293efSAlan Stern /* Was the hub disconnected while we were waiting? */ 996ca5cbc8bSAlan Stern if (hub->disconnected) 997ca5cbc8bSAlan Stern goto disconnected; 9988520f380SAlan Stern if (type == HUB_INIT2) 9998520f380SAlan Stern goto init2; 10008520f380SAlan Stern goto init3; 1001e50293efSAlan Stern } 1002e50293efSAlan Stern kref_get(&hub->kref); 10035e6effaeSAlan Stern 1004a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1005a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1006a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1007a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1008a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1009a45aa3b3SElric Fu * reset procedure. 1010a45aa3b3SElric Fu * 1011a45aa3b3SElric Fu * After a resume, port power should still be on. 1012f2835219SAlan Stern * For any other type of activation, turn it on. 1013f2835219SAlan Stern */ 10148520f380SAlan Stern if (type != HUB_RESUME) { 1015a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1016a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1017a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1018a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1019a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1020a45aa3b3SElric Fu if (ret < 0) 1021a45aa3b3SElric Fu dev_err(hub->intfdev, 1022a45aa3b3SElric Fu "set hub depth failed\n"); 1023a45aa3b3SElric Fu } 10248520f380SAlan Stern 10258520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10268520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10278520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10288520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10298520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10308520f380SAlan Stern * rather than as a module). It adds up. 10318520f380SAlan Stern * 10328520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10338520f380SAlan Stern * because for those activation types the ports have to be 10348520f380SAlan Stern * operational when we return. In theory this could be done 10358520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10368520f380SAlan Stern */ 10378520f380SAlan Stern if (type == HUB_INIT) { 103817a364e2SKris Borer delay = hub_power_on_good_delay(hub); 10397ad3c470SDan Williams 10407ad3c470SDan Williams hub_power_on(hub, false); 104177fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); 104222f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 104322f6a0f0SShaibal Dutta &hub->init_work, 10448520f380SAlan Stern msecs_to_jiffies(delay)); 104561fbeba1SAlan Stern 104661fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10478e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10488e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10498520f380SAlan Stern return; /* Continues at init2: below */ 1050653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1051653a39d1SSarah Sharp /* The internal host controller state for the hub device 1052653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1053653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1054653a39d1SSarah Sharp */ 1055653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1056653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1057653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1058653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1059653a39d1SSarah Sharp if (ret < 0) { 10601ccc417eSJoe Perches dev_err(hub->intfdev, 10611ccc417eSJoe Perches "Host not accepting hub info update\n"); 10621ccc417eSJoe Perches dev_err(hub->intfdev, 10631ccc417eSJoe Perches "LS/FS devices and hubs may not work under this hub\n"); 1064653a39d1SSarah Sharp } 1065653a39d1SSarah Sharp } 1066653a39d1SSarah Sharp hub_power_on(hub, true); 10678520f380SAlan Stern } else { 10688520f380SAlan Stern hub_power_on(hub, true); 10698520f380SAlan Stern } 10708520f380SAlan Stern } 10718520f380SAlan Stern init2: 1072f2835219SAlan Stern 1073d99f6b41SDan Williams /* 107437ebb549SPetr Mladek * Check each port and set hub->change_bits to let hub_wq know 10756ee0b270SAlan Stern * which ports need attention. 10765e6effaeSAlan Stern */ 10775e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1078d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 1079d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 10805e6effaeSAlan Stern u16 portstatus, portchange; 10815e6effaeSAlan Stern 10826ee0b270SAlan Stern portstatus = portchange = 0; 10836ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1084245b2eecSGuenter Roeck if (status) 1085245b2eecSGuenter Roeck goto abort; 1086245b2eecSGuenter Roeck 10876ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 1088d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x change %04x\n", 1089d99f6b41SDan Williams portstatus, portchange); 10905e6effaeSAlan Stern 1091d99f6b41SDan Williams /* 1092d99f6b41SDan Williams * After anything other than HUB_RESUME (i.e., initialization 10936ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 10946ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 10956ee0b270SAlan Stern * and so should ports for which we have no usb_device. 10965e6effaeSAlan Stern */ 10976ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 10986ee0b270SAlan Stern type != HUB_RESUME || 10996ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 11006ee0b270SAlan Stern !udev || 11016ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11029f0a6cd3SAndiry Xu /* 11039f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11049f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1105fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1106fd1ac4cfSDan Williams * power was lost 11079f0a6cd3SAndiry Xu */ 1108fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1109fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1110ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11119f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11129f0a6cd3SAndiry Xu } 11136ee0b270SAlan Stern 1114948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1115948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1116948fea37SAlan Stern need_debounce_delay = true; 1117ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1118948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1119948fea37SAlan Stern } 1120948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1121948fea37SAlan Stern need_debounce_delay = true; 1122ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1123948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1124948fea37SAlan Stern } 1125e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1126e92aee33SJulius Werner need_debounce_delay = true; 1127e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1128e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1129e92aee33SJulius Werner } 113079c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 113179c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 113279c3dd81SDon Zickus need_debounce_delay = true; 1133ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 113479c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 113579c3dd81SDon Zickus } 1136253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1137253e0572SAlan Stern * physical disconnect or the connect status changes. 1138253e0572SAlan Stern */ 1139253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1140253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1141253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1142253e0572SAlan Stern 11436ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 114437ebb549SPetr Mladek /* Tell hub_wq to disconnect the device or 11456ee0b270SAlan Stern * check for a new connection 11466ee0b270SAlan Stern */ 114708d1dec6SShen Guang if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || 114808d1dec6SShen Guang (portstatus & USB_PORT_STAT_OVERCURRENT)) 11496ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11506ee0b270SAlan Stern 11516ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 115272937e1eSSarah Sharp bool port_resumed = (portstatus & 115372937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 115472937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11556ee0b270SAlan Stern /* The power session apparently survived the resume. 11566ee0b270SAlan Stern * If there was an overcurrent or suspend change 115737ebb549SPetr Mladek * (i.e., remote wakeup request), have hub_wq 115872937e1eSSarah Sharp * take care of it. Look at the port link state 115972937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 116072937e1eSSarah Sharp * change bit, and they don't set the port link change 116172937e1eSSarah Sharp * bit on device-initiated resume. 11626ee0b270SAlan Stern */ 116372937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 116472937e1eSSarah Sharp port_resumed)) 11656ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11666ee0b270SAlan Stern 11676ee0b270SAlan Stern } else if (udev->persist_enabled) { 11686ee0b270SAlan Stern #ifdef CONFIG_PM 11695e6effaeSAlan Stern udev->reset_resume = 1; 11706ee0b270SAlan Stern #endif 1171ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1172ad493e5eSLan Tianyu * was powered off. 1173ad493e5eSLan Tianyu */ 1174d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 11758808f00cSAlan Stern set_bit(port1, hub->change_bits); 11768808f00cSAlan Stern 11776ee0b270SAlan Stern } else { 117837ebb549SPetr Mladek /* The power session is gone; tell hub_wq */ 11796ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11806ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11815e6effaeSAlan Stern } 11825e6effaeSAlan Stern } 11835e6effaeSAlan Stern 1184948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1185948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 118637ebb549SPetr Mladek * ports all at once right now, instead of letting hub_wq do them 1187948fea37SAlan Stern * one at a time later on. 1188948fea37SAlan Stern * 118937ebb549SPetr Mladek * If any port-status changes do occur during this delay, hub_wq 1190948fea37SAlan Stern * will see them later and handle them normally. 1191948fea37SAlan Stern */ 11928520f380SAlan Stern if (need_debounce_delay) { 11938520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1194f2835219SAlan Stern 11958520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 11968520f380SAlan Stern if (type == HUB_INIT2) { 119777fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); 119822f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 119922f6a0f0SShaibal Dutta &hub->init_work, 12008520f380SAlan Stern msecs_to_jiffies(delay)); 120107d316a2SAlan Stern device_unlock(&hdev->dev); 12028520f380SAlan Stern return; /* Continues at init3: below */ 12038520f380SAlan Stern } else { 12048520f380SAlan Stern msleep(delay); 12058520f380SAlan Stern } 12068520f380SAlan Stern } 12078520f380SAlan Stern init3: 1208f2835219SAlan Stern hub->quiescing = 0; 1209f2835219SAlan Stern 1210f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1211f2835219SAlan Stern if (status < 0) 1212f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1213f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 121422f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 121522f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 1216f2835219SAlan Stern 1217f2835219SAlan Stern /* Scan all ports that need attention */ 121832a69589SPetr Mladek kick_hub_wq(hub); 1219245b2eecSGuenter Roeck abort: 1220ca5cbc8bSAlan Stern if (type == HUB_INIT2 || type == HUB_INIT3) { 12218e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 1222ca5cbc8bSAlan Stern disconnected: 12238e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 122407d316a2SAlan Stern device_unlock(&hdev->dev); 1225ca5cbc8bSAlan Stern } 1226e50293efSAlan Stern 1227e50293efSAlan Stern kref_put(&hub->kref, hub_release); 12285e6effaeSAlan Stern } 12295e6effaeSAlan Stern 12308520f380SAlan Stern /* Implement the continuations for the delays above */ 12318520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12328520f380SAlan Stern { 12338520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12348520f380SAlan Stern 12358520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12368520f380SAlan Stern } 12378520f380SAlan Stern 12388520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12398520f380SAlan Stern { 12408520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12418520f380SAlan Stern 12428520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12438520f380SAlan Stern } 12448520f380SAlan Stern 12454330354fSAlan Stern enum hub_quiescing_type { 12464330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12474330354fSAlan Stern }; 12484330354fSAlan Stern 12494330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12504330354fSAlan Stern { 12514330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12524330354fSAlan Stern int i; 12534330354fSAlan Stern 125437ebb549SPetr Mladek /* hub_wq and related activity won't re-trigger */ 12554330354fSAlan Stern hub->quiescing = 1; 12564330354fSAlan Stern 12574330354fSAlan Stern if (type != HUB_SUSPEND) { 12584330354fSAlan Stern /* Disconnect all the children */ 12594330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1260ff823c79SLan Tianyu if (hub->ports[i]->child) 1261ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12624330354fSAlan Stern } 12634330354fSAlan Stern } 12644330354fSAlan Stern 126537ebb549SPetr Mladek /* Stop hub_wq and related activity */ 12664330354fSAlan Stern usb_kill_urb(hub->urb); 12674330354fSAlan Stern if (hub->has_indicators) 12684330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12694330354fSAlan Stern if (hub->tt.hub) 1270036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 12714330354fSAlan Stern } 12724330354fSAlan Stern 1273600856c2SAlan Stern static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) 1274600856c2SAlan Stern { 1275600856c2SAlan Stern int i; 1276600856c2SAlan Stern 1277600856c2SAlan Stern for (i = 0; i < hub->hdev->maxchild; ++i) 1278600856c2SAlan Stern pm_runtime_barrier(&hub->ports[i]->dev); 1279600856c2SAlan Stern } 1280600856c2SAlan Stern 12813eb14915SAlan Stern /* caller has locked the hub device */ 12823eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12833eb14915SAlan Stern { 12843eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12853eb14915SAlan Stern 12864330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1287600856c2SAlan Stern hub->in_reset = 1; 1288600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1289f07600cfSAlan Stern return 0; 12907d069b7dSAlan Stern } 12917d069b7dSAlan Stern 12927d069b7dSAlan Stern /* caller has locked the hub device */ 1293f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12947d069b7dSAlan Stern { 12957de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12967de18d8bSAlan Stern 1297600856c2SAlan Stern hub->in_reset = 0; 1298600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1299f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1300f07600cfSAlan Stern return 0; 13017d069b7dSAlan Stern } 13027d069b7dSAlan Stern 13031da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 13041da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 13051da177e4SLinus Torvalds { 1306b356b7c7SSarah Sharp struct usb_hcd *hcd; 13071da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 13081da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 13091da177e4SLinus Torvalds u16 hubstatus, hubchange; 131074ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 13111da177e4SLinus Torvalds unsigned int pipe; 1312fa2a9566SLan Tianyu int maxp, ret, i; 13137cbe5dcaSAlan Stern char *message = "out of memory"; 1314430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1315430ee58eSSebastian Andrzej Siewior unsigned full_load; 1316d8521afeSDan Williams unsigned maxchild; 13171da177e4SLinus Torvalds 1318d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13191da177e4SLinus Torvalds if (!hub->buffer) { 13201da177e4SLinus Torvalds ret = -ENOMEM; 13211da177e4SLinus Torvalds goto fail; 13221da177e4SLinus Torvalds } 13231da177e4SLinus Torvalds 13241da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13251da177e4SLinus Torvalds if (!hub->status) { 13261da177e4SLinus Torvalds ret = -ENOMEM; 13271da177e4SLinus Torvalds goto fail; 13281da177e4SLinus Torvalds } 1329db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13301da177e4SLinus Torvalds 1331bec444cdSJohan Hovold hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13321da177e4SLinus Torvalds if (!hub->descriptor) { 13331da177e4SLinus Torvalds ret = -ENOMEM; 13341da177e4SLinus Torvalds goto fail; 13351da177e4SLinus Torvalds } 13361da177e4SLinus Torvalds 13371da177e4SLinus Torvalds /* Request the entire hub descriptor. 13381da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13392c25a2c8SJohan Hovold * but a (non-SS) hub can/will return fewer bytes here. 13401da177e4SLinus Torvalds */ 1341dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13421da177e4SLinus Torvalds if (ret < 0) { 13431da177e4SLinus Torvalds message = "can't read hub descriptor"; 13441da177e4SLinus Torvalds goto fail; 134593491cedSJohan Hovold } 134693491cedSJohan Hovold 134793491cedSJohan Hovold maxchild = USB_MAXCHILDREN; 134893491cedSJohan Hovold if (hub_is_superspeed(hdev)) 134993491cedSJohan Hovold maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS); 135093491cedSJohan Hovold 135193491cedSJohan Hovold if (hub->descriptor->bNbrPorts > maxchild) { 13521da177e4SLinus Torvalds message = "hub has too many ports!"; 13531da177e4SLinus Torvalds ret = -ENODEV; 13541da177e4SLinus Torvalds goto fail; 1355769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1356769d7368SDavid Linares message = "hub doesn't have any ports!"; 1357769d7368SDavid Linares ret = -ENODEV; 1358769d7368SDavid Linares goto fail; 13591da177e4SLinus Torvalds } 13601da177e4SLinus Torvalds 1361886ee36eSFelipe Balbi /* 1362886ee36eSFelipe Balbi * Accumulate wHubDelay + 40ns for every hub in the tree of devices. 1363886ee36eSFelipe Balbi * The resulting value will be used for SetIsochDelay() request. 1364886ee36eSFelipe Balbi */ 1365886ee36eSFelipe Balbi if (hub_is_superspeed(hdev) || hub_is_superspeedplus(hdev)) { 1366886ee36eSFelipe Balbi u32 delay = __le16_to_cpu(hub->descriptor->u.ss.wHubDelay); 1367886ee36eSFelipe Balbi 1368886ee36eSFelipe Balbi if (hdev->parent) 1369886ee36eSFelipe Balbi delay += hdev->parent->hub_delay; 1370886ee36eSFelipe Balbi 1371886ee36eSFelipe Balbi delay += USB_TP_TRANSMISSION_DELAY; 1372886ee36eSFelipe Balbi hdev->hub_delay = min_t(u32, delay, USB_TP_TRANSMISSION_DELAY_MAX); 1373886ee36eSFelipe Balbi } 1374886ee36eSFelipe Balbi 1375d8521afeSDan Williams maxchild = hub->descriptor->bNbrPorts; 1376d8521afeSDan Williams dev_info(hub_dev, "%d port%s detected\n", maxchild, 1377d8521afeSDan Williams (maxchild == 1) ? "" : "s"); 13781da177e4SLinus Torvalds 13796396bb22SKees Cook hub->ports = kcalloc(maxchild, sizeof(struct usb_port *), GFP_KERNEL); 1380ff823c79SLan Tianyu if (!hub->ports) { 13817cbe5dcaSAlan Stern ret = -ENOMEM; 13827cbe5dcaSAlan Stern goto fail; 13837cbe5dcaSAlan Stern } 13847cbe5dcaSAlan Stern 138574ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1386430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1387430ee58eSSebastian Andrzej Siewior unit_load = 150; 1388430ee58eSSebastian Andrzej Siewior full_load = 900; 1389430ee58eSSebastian Andrzej Siewior } else { 1390430ee58eSSebastian Andrzej Siewior unit_load = 100; 1391430ee58eSSebastian Andrzej Siewior full_load = 500; 1392430ee58eSSebastian Andrzej Siewior } 13931da177e4SLinus Torvalds 1394dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1395dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1396dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13971da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 13981da177e4SLinus Torvalds 1399d8521afeSDan Williams for (i = 0; i < maxchild; i++) 1400dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 14011da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 14021da177e4SLinus Torvalds ? 'F' : 'R'; 1403d8521afeSDan Williams portstr[maxchild] = 0; 14041da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 14051da177e4SLinus Torvalds } else 14061da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 14071da177e4SLinus Torvalds 140874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 14097bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 14101da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 14111da177e4SLinus Torvalds break; 14127bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 14131da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 14141da177e4SLinus Torvalds break; 14157bf01185SAman Deep case HUB_CHAR_NO_LPSM: 14167bf01185SAman Deep case HUB_CHAR_LPSM: 14171da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 14181da177e4SLinus Torvalds break; 14191da177e4SLinus Torvalds } 14201da177e4SLinus Torvalds 142174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 14227bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 14231da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 14241da177e4SLinus Torvalds break; 14257bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 14261da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 14271da177e4SLinus Torvalds break; 14287bf01185SAman Deep case HUB_CHAR_NO_OCPM: 14297bf01185SAman Deep case HUB_CHAR_OCPM: 14301da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 14311da177e4SLinus Torvalds break; 14321da177e4SLinus Torvalds } 14331da177e4SLinus Torvalds 14341da177e4SLinus Torvalds spin_lock_init(&hub->tt.lock); 14351da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->tt.clear_list); 1436cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14371da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14387bf01185SAman Deep case USB_HUB_PR_FS: 14391da177e4SLinus Torvalds break; 14407bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14411da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14421da177e4SLinus Torvalds hub->tt.hub = hdev; 14431da177e4SLinus Torvalds break; 14447bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14451da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14461da177e4SLinus Torvalds if (ret == 0) { 14471da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14481da177e4SLinus Torvalds hub->tt.multi = 1; 14491da177e4SLinus Torvalds } else 14501da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14511da177e4SLinus Torvalds ret); 14521da177e4SLinus Torvalds hub->tt.hub = hdev; 14531da177e4SLinus Torvalds break; 14547bf01185SAman Deep case USB_HUB_PR_SS: 1455d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1456d2e9b4d6SSarah Sharp break; 14571da177e4SLinus Torvalds default: 14581da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14591da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14601da177e4SLinus Torvalds break; 14611da177e4SLinus Torvalds } 14621da177e4SLinus Torvalds 1463e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 146474ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1465e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1466e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1467e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1468e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1469e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1470e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1471e09711aeSdavid-b@pacbell.net } 14721da177e4SLinus Torvalds break; 1473e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1474e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1475e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1476e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1477e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14781da177e4SLinus Torvalds break; 1479e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1480e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1481e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1482e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1483e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14841da177e4SLinus Torvalds break; 1485e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1486e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1487e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1488e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1489e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14901da177e4SLinus Torvalds break; 14911da177e4SLinus Torvalds } 14921da177e4SLinus Torvalds 14931da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 149474ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14951da177e4SLinus Torvalds hub->has_indicators = 1; 14961da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14971da177e4SLinus Torvalds } 14981da177e4SLinus Torvalds 14991da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 15001da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 15011da177e4SLinus Torvalds 15021da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 15031da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 15041da177e4SLinus Torvalds */ 1505d9e1e148SFelipe Balbi ret = usb_get_std_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 150615b7336eSAlan Stern if (ret) { 15071da177e4SLinus Torvalds message = "can't get hub status"; 15081da177e4SLinus Torvalds goto fail; 15091da177e4SLinus Torvalds } 1510430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 15117d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1512430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1513430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1514430ee58eSSebastian Andrzej Siewior else 1515d8521afeSDan Williams hdev->bus_mA = full_load * maxchild; 1516430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1517430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 151855c52718SAlan Stern else { 151955c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 152055c52718SAlan Stern hub->limited_power = 1; 152155c52718SAlan Stern } 15227d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 152355c52718SAlan Stern int remaining = hdev->bus_mA - 152455c52718SAlan Stern hub->descriptor->bHubContrCurrent; 15251da177e4SLinus Torvalds 1526430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1527430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1528430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1529430ee58eSSebastian Andrzej Siewior 1530d8521afeSDan Williams if (remaining < maxchild * unit_load) 153155c52718SAlan Stern dev_warn(hub_dev, 153255c52718SAlan Stern "insufficient power available " 153355c52718SAlan Stern "to use all downstream ports\n"); 1534430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1535430ee58eSSebastian Andrzej Siewior 153655c52718SAlan Stern } else { /* Self-powered external hub */ 153755c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 153855c52718SAlan Stern * provide less current per port? */ 1539430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 154055c52718SAlan Stern } 1541430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 154255c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 154355c52718SAlan Stern hub->mA_per_port); 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15461da177e4SLinus Torvalds if (ret < 0) { 15471da177e4SLinus Torvalds message = "can't get hub status"; 15481da177e4SLinus Torvalds goto fail; 15491da177e4SLinus Torvalds } 15501da177e4SLinus Torvalds 15511da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15521da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15531da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15541da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15551da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15561da177e4SLinus Torvalds 155774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15581da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15591da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15601da177e4SLinus Torvalds 156188fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 156288fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 156388fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 156488fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 156588fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 156688fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15671da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15681da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15691da177e4SLinus Torvalds 15701da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15711da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15721da177e4SLinus Torvalds 15731da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15741da177e4SLinus Torvalds if (!hub->urb) { 15751da177e4SLinus Torvalds ret = -ENOMEM; 15761da177e4SLinus Torvalds goto fail; 15771da177e4SLinus Torvalds } 15781da177e4SLinus Torvalds 15791da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15801da177e4SLinus Torvalds hub, endpoint->bInterval); 15811da177e4SLinus Torvalds 15821da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15831da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15841da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 15851da177e4SLinus Torvalds 1586d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1587d8521afeSDan Williams for (i = 0; i < maxchild; i++) { 1588e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1589e58547ebSKrzysztof Mazur if (ret < 0) { 1590fa2a9566SLan Tianyu dev_err(hub->intfdev, 1591fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1592d8521afeSDan Williams break; 1593d8521afeSDan Williams } 1594d8521afeSDan Williams } 1595e58547ebSKrzysztof Mazur hdev->maxchild = i; 1596e3d10505SDan Williams for (i = 0; i < hdev->maxchild; i++) { 1597e3d10505SDan Williams struct usb_port *port_dev = hub->ports[i]; 1598e3d10505SDan Williams 1599e3d10505SDan Williams pm_runtime_put(&port_dev->dev); 1600e3d10505SDan Williams } 1601e3d10505SDan Williams 1602d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1603d8521afeSDan Williams if (ret < 0) 1604d8521afeSDan Williams goto fail; 1605fa2a9566SLan Tianyu 160637ebb549SPetr Mladek /* Update the HCD's internal representation of this hub before hub_wq 1607e3d95580SDan Williams * starts getting port status changes for devices under the hub. 1608e3d95580SDan Williams */ 1609e3d95580SDan Williams if (hcd->driver->update_hub_device) { 1610e3d95580SDan Williams ret = hcd->driver->update_hub_device(hcd, hdev, 1611e3d95580SDan Williams &hub->tt, GFP_KERNEL); 1612e3d95580SDan Williams if (ret < 0) { 1613e3d95580SDan Williams message = "can't update HCD hub info"; 1614e3d95580SDan Williams goto fail; 1615e3d95580SDan Williams } 1616e3d95580SDan Williams } 1617e3d95580SDan Williams 1618d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1619d2123fd9SLan Tianyu 1620f2835219SAlan Stern hub_activate(hub, HUB_INIT); 16211da177e4SLinus Torvalds return 0; 16221da177e4SLinus Torvalds 16231da177e4SLinus Torvalds fail: 16241da177e4SLinus Torvalds dev_err(hub_dev, "config failed, %s (err %d)\n", 16251da177e4SLinus Torvalds message, ret); 16261da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 16271da177e4SLinus Torvalds return ret; 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds 1630e8054854SAlan Stern static void hub_release(struct kref *kref) 1631e8054854SAlan Stern { 1632e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1633e8054854SAlan Stern 16345d14f323SPetr Mladek usb_put_dev(hub->hdev); 1635e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1636e8054854SAlan Stern kfree(hub); 1637e8054854SAlan Stern } 1638e8054854SAlan Stern 16391da177e4SLinus Torvalds static unsigned highspeed_hubs; 16401da177e4SLinus Torvalds 16411da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 16421da177e4SLinus Torvalds { 16431da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1644fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1645543d7784SAlan Stern int port1; 1646fa2a9566SLan Tianyu 164732a69589SPetr Mladek /* 164832a69589SPetr Mladek * Stop adding new hub events. We do not want to block here and thus 164932a69589SPetr Mladek * will not try to remove any pending work item. 165032a69589SPetr Mladek */ 1651e8054854SAlan Stern hub->disconnected = 1; 16521da177e4SLinus Torvalds 16537de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16547de18d8bSAlan Stern hub->error = 0; 16554330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16567de18d8bSAlan Stern 1657d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1658d8521afeSDan Williams 1659543d7784SAlan Stern /* Avoid races with recursively_mark_NOTATTACHED() */ 1660543d7784SAlan Stern spin_lock_irq(&device_state_lock); 1661543d7784SAlan Stern port1 = hdev->maxchild; 1662543d7784SAlan Stern hdev->maxchild = 0; 16638b28c752SAlan Stern usb_set_intfdata(intf, NULL); 1664543d7784SAlan Stern spin_unlock_irq(&device_state_lock); 16651f2235b8SAlexander Shishkin 1666543d7784SAlan Stern for (; port1 > 0; --port1) 1667543d7784SAlan Stern usb_hub_remove_port_device(hub, port1); 16681da177e4SLinus Torvalds 1669d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1670d8521afeSDan Williams 1671e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16721da177e4SLinus Torvalds highspeed_hubs--; 16731da177e4SLinus Torvalds 16741da177e4SLinus Torvalds usb_free_urb(hub->urb); 1675fa2a9566SLan Tianyu kfree(hub->ports); 16761da177e4SLinus Torvalds kfree(hub->descriptor); 16771da177e4SLinus Torvalds kfree(hub->status); 1678d697cddaSAlan Stern kfree(hub->buffer); 16791da177e4SLinus Torvalds 1680971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1681e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16821da177e4SLinus Torvalds } 16831da177e4SLinus Torvalds 1684c94dc34fSEugene Korenevsky static bool hub_descriptor_is_sane(struct usb_host_interface *desc) 1685c94dc34fSEugene Korenevsky { 1686c94dc34fSEugene Korenevsky /* Some hubs have a subclass of 1, which AFAICT according to the */ 1687c94dc34fSEugene Korenevsky /* specs is not defined, but it works */ 1688c94dc34fSEugene Korenevsky if (desc->desc.bInterfaceSubClass != 0 && 1689c94dc34fSEugene Korenevsky desc->desc.bInterfaceSubClass != 1) 1690c94dc34fSEugene Korenevsky return false; 1691c94dc34fSEugene Korenevsky 1692c94dc34fSEugene Korenevsky /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 1693c94dc34fSEugene Korenevsky if (desc->desc.bNumEndpoints != 1) 1694c94dc34fSEugene Korenevsky return false; 1695c94dc34fSEugene Korenevsky 1696c94dc34fSEugene Korenevsky /* If the first endpoint is not interrupt IN, we'd better punt! */ 1697c94dc34fSEugene Korenevsky if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) 1698c94dc34fSEugene Korenevsky return false; 1699c94dc34fSEugene Korenevsky 1700c94dc34fSEugene Korenevsky return true; 1701c94dc34fSEugene Korenevsky } 1702c94dc34fSEugene Korenevsky 17031da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 17041da177e4SLinus Torvalds { 17051da177e4SLinus Torvalds struct usb_host_interface *desc; 17061da177e4SLinus Torvalds struct usb_device *hdev; 17071da177e4SLinus Torvalds struct usb_hub *hub; 17081da177e4SLinus Torvalds 17091da177e4SLinus Torvalds desc = intf->cur_altsetting; 17101da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 17111da177e4SLinus Torvalds 1712596d789aSMing Lei /* 1713596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1714596d789aSMing Lei * based on the below considerations: 1715596d789aSMing Lei * 1716596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1717596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1718596d789aSMing Lei * event, and the submitted status URB is just to check future 1719596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1720596d789aSMing Lei * 1721596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1722596d789aSMing Lei * below very rare devices when they are plugged into hub 1723596d789aSMing Lei * first time: 1724596d789aSMing Lei * 1725596d789aSMing Lei * devices having trouble initializing, and disconnect 1726596d789aSMing Lei * themselves from the bus and then reconnect a second 1727596d789aSMing Lei * or so later 1728596d789aSMing Lei * 1729596d789aSMing Lei * devices just for downloading firmware, and disconnects 1730596d789aSMing Lei * themselves after completing it 1731596d789aSMing Lei * 1732596d789aSMing Lei * For these quite rare devices, their drivers may change the 1733596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1734596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1735596d789aSMing Lei * does care it. 1736596d789aSMing Lei * 1737596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1738596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1739596d789aSMing Lei * infrequent to worry about. 1740596d789aSMing Lei * 1741596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1742596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1743596d789aSMing Lei * of USB bus. 1744bdd405d2SRoger Quadros * 1745bdd405d2SRoger Quadros * - If user has indicated to prevent autosuspend by passing 1746bdd405d2SRoger Quadros * usbcore.autosuspend = -1 then keep autosuspend disabled. 1747596d789aSMing Lei */ 1748ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 1749bdd405d2SRoger Quadros if (hdev->dev.power.autosuspend_delay >= 0) 1750596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1751a9ef803dSGreg Kroah-Hartman #endif 1752596d789aSMing Lei 17538ef42dddSAlan Stern /* 17548ef42dddSAlan Stern * Hubs have proper suspend/resume support, except for root hubs 17558ef42dddSAlan Stern * where the controller driver doesn't have bus_suspend and 17568ef42dddSAlan Stern * bus_resume methods. 17578ef42dddSAlan Stern */ 17588ef42dddSAlan Stern if (hdev->parent) { /* normal device */ 1759088f7fecSAlan Stern usb_enable_autosuspend(hdev); 17608ef42dddSAlan Stern } else { /* root hub */ 17618ef42dddSAlan Stern const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; 17628ef42dddSAlan Stern 17638ef42dddSAlan Stern if (drv->bus_suspend && drv->bus_resume) 17648ef42dddSAlan Stern usb_enable_autosuspend(hdev); 17658ef42dddSAlan Stern } 1766088f7fecSAlan Stern 176738f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1768b9cef6c3SWu Fengguang dev_err(&intf->dev, 1769b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 177038f3ad5eSFelipe Balbi return -E2BIG; 177138f3ad5eSFelipe Balbi } 177238f3ad5eSFelipe Balbi 177389ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 177489ccbdc9SDavid Brownell if (hdev->parent) { 177589ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 177689ccbdc9SDavid Brownell return -ENODEV; 177789ccbdc9SDavid Brownell } 177889ccbdc9SDavid Brownell #endif 177989ccbdc9SDavid Brownell 1780c94dc34fSEugene Korenevsky if (!hub_descriptor_is_sane(desc)) { 17811da177e4SLinus Torvalds dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); 17821da177e4SLinus Torvalds return -EIO; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds /* We found a hub */ 17861da177e4SLinus Torvalds dev_info(&intf->dev, "USB hub found\n"); 17871da177e4SLinus Torvalds 17880a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 1789b74e7062SWolfram Sang if (!hub) 17901da177e4SLinus Torvalds return -ENOMEM; 17911da177e4SLinus Torvalds 1792e8054854SAlan Stern kref_init(&hub->kref); 17931da177e4SLinus Torvalds hub->intfdev = &intf->dev; 17941da177e4SLinus Torvalds hub->hdev = hdev; 1795c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17968520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 179732a69589SPetr Mladek INIT_WORK(&hub->events, hub_event); 1798e8054854SAlan Stern usb_get_intf(intf); 17995d14f323SPetr Mladek usb_get_dev(hdev); 18001da177e4SLinus Torvalds 18011da177e4SLinus Torvalds usb_set_intfdata(intf, hub); 180240f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1803971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 18041da177e4SLinus Torvalds 18051da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 18061da177e4SLinus Torvalds highspeed_hubs++; 18071da177e4SLinus Torvalds 1808e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1809e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1810e6f30deaSMing Lei 1811c94dc34fSEugene Korenevsky if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) 18121da177e4SLinus Torvalds return 0; 18131da177e4SLinus Torvalds 18141da177e4SLinus Torvalds hub_disconnect(intf); 18151da177e4SLinus Torvalds return -ENODEV; 18161da177e4SLinus Torvalds } 18171da177e4SLinus Torvalds 18181da177e4SLinus Torvalds static int 18191da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 18201da177e4SLinus Torvalds { 18211da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 1822ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18231da177e4SLinus Torvalds 18241da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 18251da177e4SLinus Torvalds switch (code) { 18261da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 18271da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 18281da177e4SLinus Torvalds int i; 18291da177e4SLinus Torvalds 18301da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 18311da177e4SLinus Torvalds if (hdev->devnum <= 0) 18321da177e4SLinus Torvalds info->nports = 0; 18331da177e4SLinus Torvalds else { 18341da177e4SLinus Torvalds info->nports = hdev->maxchild; 18351da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1836ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 18371da177e4SLinus Torvalds info->port[i] = 0; 18381da177e4SLinus Torvalds else 18391da177e4SLinus Torvalds info->port[i] = 1840ff823c79SLan Tianyu hub->ports[i]->child->devnum; 18411da177e4SLinus Torvalds } 18421da177e4SLinus Torvalds } 18431da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 18441da177e4SLinus Torvalds 18451da177e4SLinus Torvalds return info->nports + 1; 18461da177e4SLinus Torvalds } 18471da177e4SLinus Torvalds 18481da177e4SLinus Torvalds default: 18491da177e4SLinus Torvalds return -ENOSYS; 18501da177e4SLinus Torvalds } 18511da177e4SLinus Torvalds } 18521da177e4SLinus Torvalds 18537cbe5dcaSAlan Stern /* 18547cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 18557cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 18567cbe5dcaSAlan Stern */ 18577cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 18589b6f0c4bSValentina Manea struct usb_dev_state ***ppowner) 18597cbe5dcaSAlan Stern { 186041341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 186141341261SMathias Nyman 18627cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 18637cbe5dcaSAlan Stern return -ENODEV; 18647cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 18657cbe5dcaSAlan Stern return -EINVAL; 18667cbe5dcaSAlan Stern 186741341261SMathias Nyman /* Devices not managed by the hub driver 18687cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18697cbe5dcaSAlan Stern */ 187041341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18717cbe5dcaSAlan Stern return 0; 18727cbe5dcaSAlan Stern } 18737cbe5dcaSAlan Stern 18747cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1875336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 18769b6f0c4bSValentina Manea struct usb_dev_state *owner) 18777cbe5dcaSAlan Stern { 18787cbe5dcaSAlan Stern int rc; 18799b6f0c4bSValentina Manea struct usb_dev_state **powner; 18807cbe5dcaSAlan Stern 18817cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18827cbe5dcaSAlan Stern if (rc) 18837cbe5dcaSAlan Stern return rc; 18847cbe5dcaSAlan Stern if (*powner) 18857cbe5dcaSAlan Stern return -EBUSY; 18867cbe5dcaSAlan Stern *powner = owner; 18877cbe5dcaSAlan Stern return rc; 18887cbe5dcaSAlan Stern } 18896080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_claim_port); 18907cbe5dcaSAlan Stern 1891336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 18929b6f0c4bSValentina Manea struct usb_dev_state *owner) 18937cbe5dcaSAlan Stern { 18947cbe5dcaSAlan Stern int rc; 18959b6f0c4bSValentina Manea struct usb_dev_state **powner; 18967cbe5dcaSAlan Stern 18977cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18987cbe5dcaSAlan Stern if (rc) 18997cbe5dcaSAlan Stern return rc; 19007cbe5dcaSAlan Stern if (*powner != owner) 19017cbe5dcaSAlan Stern return -ENOENT; 19027cbe5dcaSAlan Stern *powner = NULL; 19037cbe5dcaSAlan Stern return rc; 19047cbe5dcaSAlan Stern } 19056080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_release_port); 19067cbe5dcaSAlan Stern 19079b6f0c4bSValentina Manea void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) 19087cbe5dcaSAlan Stern { 1909ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 19107cbe5dcaSAlan Stern int n; 19117cbe5dcaSAlan Stern 1912fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1913fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1914fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 19157cbe5dcaSAlan Stern } 1916fa2a9566SLan Tianyu 19177cbe5dcaSAlan Stern } 19187cbe5dcaSAlan Stern 19197cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 19207cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 19217cbe5dcaSAlan Stern { 19227cbe5dcaSAlan Stern struct usb_hub *hub; 19237cbe5dcaSAlan Stern 19247cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 19257cbe5dcaSAlan Stern return false; 1926ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1927fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 19287cbe5dcaSAlan Stern } 19297cbe5dcaSAlan Stern 19301da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 19311da177e4SLinus Torvalds { 1932ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 19331da177e4SLinus Torvalds int i; 19341da177e4SLinus Torvalds 19351da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1936ff823c79SLan Tianyu if (hub->ports[i]->child) 1937ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 19381da177e4SLinus Torvalds } 19399bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 194015123006SSarah Sharp udev->active_duration -= jiffies; 19411da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 19421da177e4SLinus Torvalds } 19431da177e4SLinus Torvalds 19441da177e4SLinus Torvalds /** 19451da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 19461da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 19471da177e4SLinus Torvalds * @new_state: new state value to be stored 19481da177e4SLinus Torvalds * 19491da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 19501da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 19511da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 19521da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 19531da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 19541da177e4SLinus Torvalds * all changes to any device's state must be protected by the 19551da177e4SLinus Torvalds * device_state_lock spinlock. 19561da177e4SLinus Torvalds * 19571da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 19581da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 19591da177e4SLinus Torvalds * 19601da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 19611da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 19621da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 19631da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 19641da177e4SLinus Torvalds */ 19651da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 19661da177e4SLinus Torvalds enum usb_device_state new_state) 19671da177e4SLinus Torvalds { 19681da177e4SLinus Torvalds unsigned long flags; 19694681b171SRafael J. Wysocki int wakeup = -1; 19701da177e4SLinus Torvalds 19711da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19721da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19731da177e4SLinus Torvalds ; /* do nothing */ 1974b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1975fb669cc0SDavid Brownell 1976fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1977fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1978fb669cc0SDavid Brownell */ 1979fb669cc0SDavid Brownell if (udev->parent) { 1980645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1981645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1982645daaabSAlan Stern ; /* No change to wakeup settings */ 1983645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1984ddbe1fcaSLu Baolu wakeup = (udev->quirks & 1985ddbe1fcaSLu Baolu USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : 1986ddbe1fcaSLu Baolu udev->actconfig->desc.bmAttributes & 1987ddbe1fcaSLu Baolu USB_CONFIG_ATT_WAKEUP; 1988645daaabSAlan Stern else 19894681b171SRafael J. Wysocki wakeup = 0; 1990fb669cc0SDavid Brownell } 199115123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 199215123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 199315123006SSarah Sharp udev->active_duration -= jiffies; 199415123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 199515123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 199615123006SSarah Sharp udev->active_duration += jiffies; 1997645daaabSAlan Stern udev->state = new_state; 1998b94dc6b5SDavid Brownell } else 19991da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 20001da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 20014681b171SRafael J. Wysocki if (wakeup >= 0) 20024681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 20031da177e4SLinus Torvalds } 20046da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 20051da177e4SLinus Torvalds 20068af548dcSInaky Perez-Gonzalez /* 20073b29b68bSAlan Stern * Choose a device number. 20083b29b68bSAlan Stern * 20093b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 20103b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 20113b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 20123b29b68bSAlan Stern * and it usually is not the same as the device number. 20133b29b68bSAlan Stern * 20148af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 20158af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 20168af548dcSInaky Perez-Gonzalez * life of the device connection logic in 20178af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 20188af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 20198af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 20208af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 20218af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 20228af548dcSInaky Perez-Gonzalez * [X | 0x80]. 20238af548dcSInaky Perez-Gonzalez * 20248af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 20258af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 20268af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 20278af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 20288af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 2029c6515272SSarah Sharp * 2030c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 2031c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 2032c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 2033c6515272SSarah Sharp * command to the hardware. 20348af548dcSInaky Perez-Gonzalez */ 20353b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 20361da177e4SLinus Torvalds { 20371da177e4SLinus Torvalds int devnum; 20381da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 20391da177e4SLinus Torvalds 2040638139ebSPetr Mladek /* be safe when more hub events are proceed in parallel */ 2041feb26ac3SChris Bainbridge mutex_lock(&bus->devnum_next_mutex); 20428af548dcSInaky Perez-Gonzalez if (udev->wusb) { 20438af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 20448af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 20458af548dcSInaky Perez-Gonzalez } else { 20468af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 20478af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 20481da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 20491da177e4SLinus Torvalds bus->devnum_next); 20501da177e4SLinus Torvalds if (devnum >= 128) 20518af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 20528af548dcSInaky Perez-Gonzalez 128, 1); 20531da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 20548af548dcSInaky Perez-Gonzalez } 20551da177e4SLinus Torvalds if (devnum < 128) { 20561da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 20571da177e4SLinus Torvalds udev->devnum = devnum; 20581da177e4SLinus Torvalds } 2059feb26ac3SChris Bainbridge mutex_unlock(&bus->devnum_next_mutex); 20601da177e4SLinus Torvalds } 20611da177e4SLinus Torvalds 20623b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 20631da177e4SLinus Torvalds { 20641da177e4SLinus Torvalds if (udev->devnum > 0) { 20651da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 20661da177e4SLinus Torvalds udev->devnum = -1; 20671da177e4SLinus Torvalds } 20681da177e4SLinus Torvalds } 20691da177e4SLinus Torvalds 20703b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 20714953d141SDavid Vrabel { 20724953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20734953d141SDavid Vrabel if (!udev->wusb) 20744953d141SDavid Vrabel udev->devnum = devnum; 20754953d141SDavid Vrabel } 20764953d141SDavid Vrabel 2077f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2078f7410cedSHerbert Xu { 2079f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2080f7410cedSHerbert Xu 2081f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2082f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2083f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2084f7410cedSHerbert Xu } 2085f7410cedSHerbert Xu 20867027df36SDan Williams static void hub_disconnect_children(struct usb_device *udev) 20877027df36SDan Williams { 20887027df36SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20897027df36SDan Williams int i; 20907027df36SDan Williams 20917027df36SDan Williams /* Free up all the children before we remove this device */ 20927027df36SDan Williams for (i = 0; i < udev->maxchild; i++) { 20937027df36SDan Williams if (hub->ports[i]->child) 20947027df36SDan Williams usb_disconnect(&hub->ports[i]->child); 20957027df36SDan Williams } 20967027df36SDan Williams } 20977027df36SDan Williams 20981da177e4SLinus Torvalds /** 20991da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 21001da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 21011da177e4SLinus Torvalds * Context: !in_interrupt () 21021da177e4SLinus Torvalds * 21031da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 21041da177e4SLinus Torvalds * 21051da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2106a4b5d606SHeiner Kallweit * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, 2107db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 21081da177e4SLinus Torvalds * 21091da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 21101da177e4SLinus Torvalds * controllers) should ever call this. 21111da177e4SLinus Torvalds * 21121da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 21131da177e4SLinus Torvalds */ 21141da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 21151da177e4SLinus Torvalds { 21167027df36SDan Williams struct usb_port *port_dev = NULL; 21171da177e4SLinus Torvalds struct usb_device *udev = *pdev; 21185b1dc209SPeter Chen struct usb_hub *hub = NULL; 21195b1dc209SPeter Chen int port1 = 1; 21201da177e4SLinus Torvalds 21211da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 21221da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 212325985edcSLucas De Marchi * this quiesces everything except pending urbs. 21241da177e4SLinus Torvalds */ 21251da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 21263b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 21273b29b68bSAlan Stern udev->devnum); 21281da177e4SLinus Torvalds 2129f5cccf49SGuenter Roeck /* 2130f5cccf49SGuenter Roeck * Ensure that the pm runtime code knows that the USB device 2131f5cccf49SGuenter Roeck * is in the process of being disconnected. 2132f5cccf49SGuenter Roeck */ 2133f5cccf49SGuenter Roeck pm_runtime_barrier(&udev->dev); 2134f5cccf49SGuenter Roeck 21359ad3d6ccSAlan Stern usb_lock_device(udev); 21369ad3d6ccSAlan Stern 21377027df36SDan Williams hub_disconnect_children(udev); 21381da177e4SLinus Torvalds 21391da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 21401da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 21411da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 21421da177e4SLinus Torvalds */ 2143782da727SAlan Stern dev_dbg(&udev->dev, "unregistering device\n"); 21441da177e4SLinus Torvalds usb_disable_device(udev, 0); 2145cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 21461da177e4SLinus Torvalds 2147fde26380SLan Tianyu if (udev->parent) { 21487027df36SDan Williams port1 = udev->portnum; 21497027df36SDan Williams hub = usb_hub_to_struct_hub(udev->parent); 21507027df36SDan Williams port_dev = hub->ports[port1 - 1]; 2151fde26380SLan Tianyu 2152fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2153fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2154971fcd49SLan Tianyu 21557027df36SDan Williams /* 21567027df36SDan Williams * As usb_port_runtime_resume() de-references udev, make 21577027df36SDan Williams * sure no resumes occur during removal 21587027df36SDan Williams */ 21597027df36SDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 21607027df36SDan Williams pm_runtime_get_sync(&port_dev->dev); 2161fde26380SLan Tianyu } 2162fde26380SLan Tianyu 21633b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2164782da727SAlan Stern usb_unlock_device(udev); 21653099e75aSGreg Kroah-Hartman 2166782da727SAlan Stern /* Unregister the device. The device driver is responsible 21673b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 21683b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2169782da727SAlan Stern */ 2170782da727SAlan Stern device_del(&udev->dev); 2171782da727SAlan Stern 2172782da727SAlan Stern /* Free the device number and delete the parent's children[] 21731da177e4SLinus Torvalds * (or root_hub) pointer. 21741da177e4SLinus Torvalds */ 21753b29b68bSAlan Stern release_devnum(udev); 21761da177e4SLinus Torvalds 21771da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 21781da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 21791da177e4SLinus Torvalds *pdev = NULL; 21801da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 21811da177e4SLinus Torvalds 21827027df36SDan Williams if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) 21837027df36SDan Williams pm_runtime_put(&port_dev->dev); 21847027df36SDan Williams 2185f7410cedSHerbert Xu hub_free_dev(udev); 2186f7410cedSHerbert Xu 2187782da727SAlan Stern put_device(&udev->dev); 21881da177e4SLinus Torvalds } 21891da177e4SLinus Torvalds 2190f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 21911da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 21921da177e4SLinus Torvalds { 21931da177e4SLinus Torvalds if (!string) 21941da177e4SLinus Torvalds return; 2195f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 21961da177e4SLinus Torvalds } 21971da177e4SLinus Torvalds 2198f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2199f2a383e4SGreg Kroah-Hartman { 220073c6d3b2SBenson Leung u16 bcdDevice = le16_to_cpu(udev->descriptor.bcdDevice); 220173c6d3b2SBenson Leung 220273c6d3b2SBenson Leung dev_info(&udev->dev, 220373c6d3b2SBenson Leung "New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%2x.%02x\n", 2204f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 220573c6d3b2SBenson Leung le16_to_cpu(udev->descriptor.idProduct), 220673c6d3b2SBenson Leung bcdDevice >> 8, bcdDevice & 0xff); 2207b9cef6c3SWu Fengguang dev_info(&udev->dev, 2208b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2209f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2210f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2211f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2212f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2213f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2214f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2215f2a383e4SGreg Kroah-Hartman } 22161da177e4SLinus Torvalds #else 2217f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 22181da177e4SLinus Torvalds #endif 22191da177e4SLinus Torvalds 22201da177e4SLinus Torvalds 22213ede760fSOliver Neukum /** 22228d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 22233ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 22243ede760fSOliver Neukum * 22258d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2226626f090cSYacine Belkadi * 2227626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 22283ede760fSOliver Neukum */ 22298d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 22301da177e4SLinus Torvalds { 2231d9d16e8aSInaky Perez-Gonzalez int err = 0; 22321da177e4SLinus Torvalds 22331da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 22341da177e4SLinus Torvalds /* 22351da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 22361da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 22371da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 22381da177e4SLinus Torvalds */ 22391da177e4SLinus Torvalds if (!udev->bus->is_b_host 22401da177e4SLinus Torvalds && udev->config 22411da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 22422eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 22431da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 224412c3da34SAlan Stern unsigned port1 = udev->portnum; 22451da177e4SLinus Torvalds 22467d2d641cSLi Jun /* descriptor may appear anywhere in config */ 22477d2d641cSLi Jun err = __usb_get_extra_descriptor(udev->rawdescriptors[0], 22487d2d641cSLi Jun le16_to_cpu(udev->config[0].desc.wTotalLength), 22497d2d641cSLi Jun USB_DT_OTG, (void **) &desc); 22507d2d641cSLi Jun if (err || !(desc->bmAttributes & USB_OTG_HNP)) 22517d2d641cSLi Jun return 0; 22527d2d641cSLi Jun 22537d2d641cSLi Jun dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", 22547d2d641cSLi Jun (port1 == bus->otg_port) ? "" : "non-"); 22551da177e4SLinus Torvalds 22561da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 22577d2d641cSLi Jun if (port1 == bus->otg_port) { 22581da177e4SLinus Torvalds bus->b_hnp_enable = 1; 22591da177e4SLinus Torvalds err = usb_control_msg(udev, 22601da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 22611da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 22627d2d641cSLi Jun USB_DEVICE_B_HNP_ENABLE, 22637d2d641cSLi Jun 0, NULL, 0, 22647d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22651da177e4SLinus Torvalds if (err < 0) { 22667d2d641cSLi Jun /* 22677d2d641cSLi Jun * OTG MESSAGE: report errors here, 22681da177e4SLinus Torvalds * customize to match your product. 22691da177e4SLinus Torvalds */ 22707d2d641cSLi Jun dev_err(&udev->dev, "can't set HNP mode: %d\n", 22711da177e4SLinus Torvalds err); 22721da177e4SLinus Torvalds bus->b_hnp_enable = 0; 22731da177e4SLinus Torvalds } 22747d2d641cSLi Jun } else if (desc->bLength == sizeof 22757d2d641cSLi Jun (struct usb_otg_descriptor)) { 22767d2d641cSLi Jun /* Set a_alt_hnp_support for legacy otg device */ 22777d2d641cSLi Jun err = usb_control_msg(udev, 22787d2d641cSLi Jun usb_sndctrlpipe(udev, 0), 22797d2d641cSLi Jun USB_REQ_SET_FEATURE, 0, 22807d2d641cSLi Jun USB_DEVICE_A_ALT_HNP_SUPPORT, 22817d2d641cSLi Jun 0, NULL, 0, 22827d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22837d2d641cSLi Jun if (err < 0) 22847d2d641cSLi Jun dev_err(&udev->dev, 22857d2d641cSLi Jun "set a_alt_hnp_support failed: %d\n", 22867d2d641cSLi Jun err); 22871da177e4SLinus Torvalds } 22881da177e4SLinus Torvalds } 22891da177e4SLinus Torvalds #endif 2290d9d16e8aSInaky Perez-Gonzalez return err; 2291d9d16e8aSInaky Perez-Gonzalez } 22921da177e4SLinus Torvalds 2293d9d16e8aSInaky Perez-Gonzalez 2294d9d16e8aSInaky Perez-Gonzalez /** 22958d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2296d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2297d9d16e8aSInaky Perez-Gonzalez * 2298d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2299d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2300d9d16e8aSInaky Perez-Gonzalez * environment. 2301d9d16e8aSInaky Perez-Gonzalez * 2302d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2303d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2304d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2305626f090cSYacine Belkadi * 2306626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2307d9d16e8aSInaky Perez-Gonzalez */ 23088d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2309d9d16e8aSInaky Perez-Gonzalez { 2310d9d16e8aSInaky Perez-Gonzalez int err; 2311026f3fcbSPeter Chen struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2312d9d16e8aSInaky Perez-Gonzalez 2313d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2314d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2315d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2316e9e88fb7SAlan Stern if (err != -ENODEV) 2317d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2318d9d16e8aSInaky Perez-Gonzalez err); 231980da2e0dSLaurent Pinchart return err; 2320d9d16e8aSInaky Perez-Gonzalez } 2321d9d16e8aSInaky Perez-Gonzalez } 232283e83ecbSThomas Pugliese 2323d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2324d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2325d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2326d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2327d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 232883e83ecbSThomas Pugliese 23298d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 233080da2e0dSLaurent Pinchart if (err < 0) 2331d9d16e8aSInaky Perez-Gonzalez return err; 233280da2e0dSLaurent Pinchart 2333026f3fcbSPeter Chen if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && 2334e5a9d621SPeter Chen !is_targeted(udev)) { 2335026f3fcbSPeter Chen /* Maybe it can talk to us, though we can't talk to it. 2336026f3fcbSPeter Chen * (Includes HNP test device.) 2337026f3fcbSPeter Chen */ 2338e5a9d621SPeter Chen if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable 2339e5a9d621SPeter Chen || udev->bus->is_b_host)) { 2340026f3fcbSPeter Chen err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); 2341026f3fcbSPeter Chen if (err < 0) 2342026f3fcbSPeter Chen dev_dbg(&udev->dev, "HNP fail, %d\n", err); 2343026f3fcbSPeter Chen } 2344026f3fcbSPeter Chen return -ENOTSUPP; 2345026f3fcbSPeter Chen } 2346026f3fcbSPeter Chen 234780da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 234880da2e0dSLaurent Pinchart 234980da2e0dSLaurent Pinchart return 0; 2350d9d16e8aSInaky Perez-Gonzalez } 2351d9d16e8aSInaky Perez-Gonzalez 2352d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2353d35e70d5SMatthew Garrett { 2354d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2355d35e70d5SMatthew Garrett struct usb_hub *hub; 2356d35e70d5SMatthew Garrett u8 port = udev->portnum; 2357d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2358d35e70d5SMatthew Garrett bool removable = true; 2359d35e70d5SMatthew Garrett 2360d35e70d5SMatthew Garrett if (!hdev) 2361d35e70d5SMatthew Garrett return; 2362d35e70d5SMatthew Garrett 2363ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2364d35e70d5SMatthew Garrett 236592bfbf71SMatthew Garrett /* 236692bfbf71SMatthew Garrett * If the platform firmware has provided information about a port, 236792bfbf71SMatthew Garrett * use that to determine whether it's removable. 236892bfbf71SMatthew Garrett */ 236992bfbf71SMatthew Garrett switch (hub->ports[udev->portnum - 1]->connect_type) { 237092bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HOT_PLUG: 237192bfbf71SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 237292bfbf71SMatthew Garrett return; 237392bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HARD_WIRED: 237458339c2eSMatthew Garrett case USB_PORT_NOT_USED: 237592bfbf71SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 237692bfbf71SMatthew Garrett return; 237758339c2eSMatthew Garrett default: 237858339c2eSMatthew Garrett break; 237992bfbf71SMatthew Garrett } 238092bfbf71SMatthew Garrett 238192bfbf71SMatthew Garrett /* 238292bfbf71SMatthew Garrett * Otherwise, check whether the hub knows whether a port is removable 238392bfbf71SMatthew Garrett * or not 238492bfbf71SMatthew Garrett */ 2385d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2386d35e70d5SMatthew Garrett 2387d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2388d35e70d5SMatthew Garrett return; 2389d35e70d5SMatthew Garrett 2390d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2391ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2392ca3c1539SLan Tianyu & (1 << port)) 2393d35e70d5SMatthew Garrett removable = false; 2394d35e70d5SMatthew Garrett } else { 2395d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2396d35e70d5SMatthew Garrett removable = false; 2397d35e70d5SMatthew Garrett } 2398d35e70d5SMatthew Garrett 2399d35e70d5SMatthew Garrett if (removable) 2400d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2401d35e70d5SMatthew Garrett else 2402d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2403a4204ff0SDan Williams 2404d35e70d5SMatthew Garrett } 2405d9d16e8aSInaky Perez-Gonzalez 2406d9d16e8aSInaky Perez-Gonzalez /** 2407d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2408d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2409d9d16e8aSInaky Perez-Gonzalez * 24108d8558d1SAlan Stern * This is called with devices which have been detected but not fully 24118d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2412d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2413d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2414a4b5d606SHeiner Kallweit * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to 2415d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2416d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2417d9d16e8aSInaky Perez-Gonzalez * 2418d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2419d9d16e8aSInaky Perez-Gonzalez * 2420d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2421626f090cSYacine Belkadi * 2422626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2423626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2424626f090cSYacine Belkadi * value. 2425626f090cSYacine Belkadi * 2426d9d16e8aSInaky Perez-Gonzalez */ 2427d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2428d9d16e8aSInaky Perez-Gonzalez { 2429d9d16e8aSInaky Perez-Gonzalez int err; 2430d9d16e8aSInaky Perez-Gonzalez 243116985408SDan Streetman if (udev->parent) { 243216985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 243316985408SDan Streetman * device (un)configuration controls wakeup capable 243416985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 243516985408SDan Streetman */ 243616985408SDan Streetman device_init_wakeup(&udev->dev, 0); 243716985408SDan Streetman } 243816985408SDan Streetman 24399bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 24409bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2441c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2442fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 24439bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 24449bbdf1e0SAlan Stern 2445c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2446c08512c7SAlan Stern * allowed for hubs during binding. 2447c08512c7SAlan Stern */ 2448c08512c7SAlan Stern usb_disable_autosuspend(udev); 2449c08512c7SAlan Stern 24508d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2451d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2452d9d16e8aSInaky Perez-Gonzalez goto fail; 2453c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2454c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2455c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24569f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 24579f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 24589f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24599f8b17e6SKay Sievers 24606cd13201SAlan Stern /* Tell the world! */ 24616cd13201SAlan Stern announce_device(udev); 2462195af2ccSAlan Stern 2463b04b3156STheodore Ts'o if (udev->serial) 2464b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2465b04b3156STheodore Ts'o if (udev->product) 2466b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2467b04b3156STheodore Ts'o if (udev->manufacturer) 2468b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2469b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2470b04b3156STheodore Ts'o 2471927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2472d35e70d5SMatthew Garrett 2473a4204ff0SDan Williams /* check whether the hub or firmware marks this port as non-removable */ 2474d35e70d5SMatthew Garrett if (udev->parent) 2475d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2476d35e70d5SMatthew Garrett 2477782da727SAlan Stern /* Register the device. The device driver is responsible 24783b23dd6fSAlan Stern * for configuring the device and invoking the add-device 24793b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2480782da727SAlan Stern */ 24811da177e4SLinus Torvalds err = device_add(&udev->dev); 24821da177e4SLinus Torvalds if (err) { 24831da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 24841da177e4SLinus Torvalds goto fail; 24851da177e4SLinus Torvalds } 24869ad3d6ccSAlan Stern 2487fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2488fde26380SLan Tianyu if (udev->parent) { 2489ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2490d5c3834eSDan Williams int port1 = udev->portnum; 2491d5c3834eSDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 2492fde26380SLan Tianyu 2493fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2494fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2495fde26380SLan Tianyu if (err) 2496fde26380SLan Tianyu goto fail; 2497fde26380SLan Tianyu 2498fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2499fde26380SLan Tianyu &udev->dev.kobj, "device"); 2500fde26380SLan Tianyu if (err) { 2501fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2502fde26380SLan Tianyu goto fail; 2503fde26380SLan Tianyu } 2504971fcd49SLan Tianyu 2505d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 2506971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2507fde26380SLan Tianyu } 2508fde26380SLan Tianyu 25093b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2510c08512c7SAlan Stern usb_mark_last_busy(udev); 2511c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2512c066475eSGreg Kroah-Hartman return err; 25131da177e4SLinus Torvalds 25141da177e4SLinus Torvalds fail: 25151da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 25169bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 25179bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2518d9d16e8aSInaky Perez-Gonzalez return err; 25191da177e4SLinus Torvalds } 25201da177e4SLinus Torvalds 252193993a0aSInaky Perez-Gonzalez 252293993a0aSInaky Perez-Gonzalez /** 2523fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2524fd39c86bSRandy Dunlap * @usb_dev: USB device 2525fd39c86bSRandy Dunlap * 2526fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2527fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 252893993a0aSInaky Perez-Gonzalez * 252993993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 253093993a0aSInaky Perez-Gonzalez * defer its call. 2531626f090cSYacine Belkadi * 2532626f090cSYacine Belkadi * Return: 0. 253393993a0aSInaky Perez-Gonzalez */ 253493993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 253593993a0aSInaky Perez-Gonzalez { 253693993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 253793993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 253893993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2539da307123SAlan Stern 254093993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 254193993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2542da307123SAlan Stern 254393993a0aSInaky Perez-Gonzalez out_unauthorized: 254493993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 254593993a0aSInaky Perez-Gonzalez return 0; 254693993a0aSInaky Perez-Gonzalez } 254793993a0aSInaky Perez-Gonzalez 254893993a0aSInaky Perez-Gonzalez 254993993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 255093993a0aSInaky Perez-Gonzalez { 255193993a0aSInaky Perez-Gonzalez int result = 0, c; 2552da307123SAlan Stern 255393993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 255493993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 255593993a0aSInaky Perez-Gonzalez goto out_authorized; 2556da307123SAlan Stern 255793993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 255893993a0aSInaky Perez-Gonzalez if (result < 0) { 255993993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 256093993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 256193993a0aSInaky Perez-Gonzalez goto error_autoresume; 256293993a0aSInaky Perez-Gonzalez } 2563e50a322eSJosef Gajdusek 2564e50a322eSJosef Gajdusek if (usb_dev->wusb) { 256593993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 256693993a0aSInaky Perez-Gonzalez if (result < 0) { 256793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 256893993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 256993993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 257093993a0aSInaky Perez-Gonzalez } 2571e50a322eSJosef Gajdusek } 2572da307123SAlan Stern 257393993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 257493993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 257593993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 257693993a0aSInaky Perez-Gonzalez */ 2577b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 257893993a0aSInaky Perez-Gonzalez if (c >= 0) { 257993993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 258093993a0aSInaky Perez-Gonzalez if (result) { 258193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 258293993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 258393993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 258493993a0aSInaky Perez-Gonzalez * set other configurations. */ 258593993a0aSInaky Perez-Gonzalez } 258693993a0aSInaky Perez-Gonzalez } 258793993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2588da307123SAlan Stern 258993993a0aSInaky Perez-Gonzalez error_device_descriptor: 2590da307123SAlan Stern usb_autosuspend_device(usb_dev); 259193993a0aSInaky Perez-Gonzalez error_autoresume: 259293993a0aSInaky Perez-Gonzalez out_authorized: 2593781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 259493993a0aSInaky Perez-Gonzalez return result; 259593993a0aSInaky Perez-Gonzalez } 259693993a0aSInaky Perez-Gonzalez 25970cdd49a1SMathias Nyman /* 25980cdd49a1SMathias Nyman * Return 1 if port speed is SuperSpeedPlus, 0 otherwise 25990cdd49a1SMathias Nyman * check it from the link protocol field of the current speed ID attribute. 26000cdd49a1SMathias Nyman * current speed ID is got from ext port status request. Sublink speed attribute 26010cdd49a1SMathias Nyman * table is returned with the hub BOS SSP device capability descriptor 26020cdd49a1SMathias Nyman */ 26030cdd49a1SMathias Nyman static int port_speed_is_ssp(struct usb_device *hdev, int speed_id) 26040cdd49a1SMathias Nyman { 26050cdd49a1SMathias Nyman int ssa_count; 26060cdd49a1SMathias Nyman u32 ss_attr; 26070cdd49a1SMathias Nyman int i; 26080cdd49a1SMathias Nyman struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; 26090cdd49a1SMathias Nyman 26100cdd49a1SMathias Nyman if (!ssp_cap) 26110cdd49a1SMathias Nyman return 0; 26120cdd49a1SMathias Nyman 26130cdd49a1SMathias Nyman ssa_count = le32_to_cpu(ssp_cap->bmAttributes) & 26140cdd49a1SMathias Nyman USB_SSP_SUBLINK_SPEED_ATTRIBS; 26150cdd49a1SMathias Nyman 26160cdd49a1SMathias Nyman for (i = 0; i <= ssa_count; i++) { 26170cdd49a1SMathias Nyman ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); 26180cdd49a1SMathias Nyman if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID)) 26190cdd49a1SMathias Nyman return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP); 26200cdd49a1SMathias Nyman } 26210cdd49a1SMathias Nyman return 0; 26220cdd49a1SMathias Nyman } 262393993a0aSInaky Perez-Gonzalez 26240165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 26250165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 26260165de09SInaky Perez-Gonzalez { 26270165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 26280165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 26290165de09SInaky Perez-Gonzalez return 0; 26306ae706aeSGeliang Tang hcd = bus_to_hcd(hub->hdev->bus); 26310165de09SInaky Perez-Gonzalez return hcd->wireless; 26320165de09SInaky Perez-Gonzalez } 26330165de09SInaky Perez-Gonzalez 26340165de09SInaky Perez-Gonzalez 26351da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 26361da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 26371da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 26381da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 263925244227SNicolas Boichat #define USE_NEW_SCHEME(i, scheme) ((i) / 2 == (int)scheme) 26401da177e4SLinus Torvalds 264174072baeSMathias Nyman #define HUB_ROOT_RESET_TIME 60 /* times are in msec */ 26421da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 264375d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 26441da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 264577c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 26461da177e4SLinus Torvalds 264748fc7dbdSDan Williams /* 264848fc7dbdSDan Williams * "New scheme" enumeration causes an extra state transition to be 264948fc7dbdSDan Williams * exposed to an xhci host and causes USB3 devices to receive control 265048fc7dbdSDan Williams * commands in the default state. This has been seen to cause 265148fc7dbdSDan Williams * enumeration failures, so disable this enumeration scheme for USB3 265248fc7dbdSDan Williams * devices. 265348fc7dbdSDan Williams */ 265425244227SNicolas Boichat static bool use_new_scheme(struct usb_device *udev, int retry, 265525244227SNicolas Boichat struct usb_port *port_dev) 265648fc7dbdSDan Williams { 265725244227SNicolas Boichat int old_scheme_first_port = 265825244227SNicolas Boichat port_dev->quirks & USB_PORT_QUIRK_OLD_SCHEME; 265925244227SNicolas Boichat 26608a1b2725SMathias Nyman if (udev->speed >= USB_SPEED_SUPER) 266148fc7dbdSDan Williams return false; 266248fc7dbdSDan Williams 266325244227SNicolas Boichat return USE_NEW_SCHEME(retry, old_scheme_first_port || old_scheme_first); 266448fc7dbdSDan Williams } 266548fc7dbdSDan Williams 2666025d4430SRahul Bedarkar /* Is a USB 3.0 port in the Inactive or Compliance Mode state? 26678bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 26688bea2bd3SStanislaw Ledwon */ 26693cd12f91SDan Williams static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, 26703cd12f91SDan Williams u16 portstatus) 267110d674a8SSarah Sharp { 26723cd12f91SDan Williams u16 link_state; 26733cd12f91SDan Williams 26743cd12f91SDan Williams if (!hub_is_superspeed(hub->hdev)) 26753cd12f91SDan Williams return false; 26763cd12f91SDan Williams 26773cd12f91SDan Williams if (test_bit(port1, hub->warm_reset_bits)) 26783cd12f91SDan Williams return true; 26793cd12f91SDan Williams 26803cd12f91SDan Williams link_state = portstatus & USB_PORT_STAT_LINK_STATE; 26813cd12f91SDan Williams return link_state == USB_SS_PORT_LS_SS_INACTIVE 26823cd12f91SDan Williams || link_state == USB_SS_PORT_LS_COMP_MOD; 268310d674a8SSarah Sharp } 268410d674a8SSarah Sharp 26851da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 268675d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 26871da177e4SLinus Torvalds { 26881da177e4SLinus Torvalds int delay_time, ret; 26891da177e4SLinus Torvalds u16 portstatus; 26901da177e4SLinus Torvalds u16 portchange; 26910cdd49a1SMathias Nyman u32 ext_portstatus = 0; 26921da177e4SLinus Torvalds 26931da177e4SLinus Torvalds for (delay_time = 0; 26941da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 26951da177e4SLinus Torvalds delay_time += delay) { 26961da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 26971da177e4SLinus Torvalds msleep(delay); 26981da177e4SLinus Torvalds 26991da177e4SLinus Torvalds /* read and decode port status */ 27000cdd49a1SMathias Nyman if (hub_is_superspeedplus(hub->hdev)) 27010cdd49a1SMathias Nyman ret = hub_ext_port_status(hub, port1, 27020cdd49a1SMathias Nyman HUB_EXT_PORT_STATUS, 27030cdd49a1SMathias Nyman &portstatus, &portchange, 27040cdd49a1SMathias Nyman &ext_portstatus); 27050cdd49a1SMathias Nyman else 27060cdd49a1SMathias Nyman ret = hub_port_status(hub, port1, &portstatus, 27070cdd49a1SMathias Nyman &portchange); 27081da177e4SLinus Torvalds if (ret < 0) 27091da177e4SLinus Torvalds return ret; 27101da177e4SLinus Torvalds 271122547c4cSGuenter Roeck /* 271222547c4cSGuenter Roeck * The port state is unknown until the reset completes. 271322547c4cSGuenter Roeck * 271422547c4cSGuenter Roeck * On top of that, some chips may require additional time 271522547c4cSGuenter Roeck * to re-establish a connection after the reset is complete, 271622547c4cSGuenter Roeck * so also wait for the connection to be re-established. 271722547c4cSGuenter Roeck */ 271822547c4cSGuenter Roeck if (!(portstatus & USB_PORT_STAT_RESET) && 271922547c4cSGuenter Roeck (portstatus & USB_PORT_STAT_CONNECTION)) 2720470f0be8SSarah Sharp break; 2721470f0be8SSarah Sharp 2722470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2723470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2724470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2725470f0be8SSarah Sharp 2726d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, 2727d99f6b41SDan Williams "not %sreset yet, waiting %dms\n", 2728d99f6b41SDan Williams warm ? "warm " : "", delay); 2729470f0be8SSarah Sharp } 2730470f0be8SSarah Sharp 27314f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2732470f0be8SSarah Sharp return -EBUSY; 27334f43447eSSarah Sharp 27343cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) 2735a24a6078SSarah Sharp return -ENOTCONN; 273610d674a8SSarah Sharp 27371da177e4SLinus Torvalds /* Device went away? */ 27381da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 27391da177e4SLinus Torvalds return -ENOTCONN; 27401da177e4SLinus Torvalds 27411ac7db63SMathias Nyman /* Retry if connect change is set but status is still connected. 27421ac7db63SMathias Nyman * A USB 3.0 connection may bounce if multiple warm resets were issued, 2743a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2744a24a6078SSarah Sharp */ 2745a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 27461ac7db63SMathias Nyman (portchange & USB_PORT_STAT_C_CONNECTION)) { 27471ac7db63SMathias Nyman usb_clear_port_feature(hub->hdev, port1, 27481ac7db63SMathias Nyman USB_PORT_FEAT_C_CONNECTION); 27491ac7db63SMathias Nyman return -EAGAIN; 27501ac7db63SMathias Nyman } 27511da177e4SLinus Torvalds 2752470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2753470f0be8SSarah Sharp return -EBUSY; 2754470f0be8SSarah Sharp 27552d4fa940SSarah Sharp if (!udev) 27562d4fa940SSarah Sharp return 0; 27572d4fa940SSarah Sharp 2758013eedb8SMathias Nyman if (hub_is_superspeedplus(hub->hdev)) { 2759013eedb8SMathias Nyman /* extended portstatus Rx and Tx lane count are zero based */ 2760013eedb8SMathias Nyman udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1; 2761013eedb8SMathias Nyman udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1; 2762013eedb8SMathias Nyman } else { 2763013eedb8SMathias Nyman udev->rx_lanes = 1; 2764013eedb8SMathias Nyman udev->tx_lanes = 1; 2765013eedb8SMathias Nyman } 27660165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2767551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 27680cdd49a1SMathias Nyman else if (hub_is_superspeedplus(hub->hdev) && 27690cdd49a1SMathias Nyman port_speed_is_ssp(hub->hdev, ext_portstatus & 27700cdd49a1SMathias Nyman USB_EXT_PORT_STAT_RX_SPEED_ID)) 27710cdd49a1SMathias Nyman udev->speed = USB_SPEED_SUPER_PLUS; 2772131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2773809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 27740165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 27751da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 27761da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 27771da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 27781da177e4SLinus Torvalds else 27791da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 27801da177e4SLinus Torvalds return 0; 27811da177e4SLinus Torvalds } 27821da177e4SLinus Torvalds 278375d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 278475d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 278575d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 278675d7cf72SAndiry Xu { 278775d7cf72SAndiry Xu int i, status; 2788a24a6078SSarah Sharp u16 portchange, portstatus; 2789d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 279075d7cf72SAndiry Xu 279175d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 27920fe51aa5SSarah Sharp if (warm) { 279375d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 279475d7cf72SAndiry Xu "warm reset\n"); 279575d7cf72SAndiry Xu return -EINVAL; 279675d7cf72SAndiry Xu } 27970fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 27980fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 27990fe51aa5SSarah Sharp */ 28000fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2801d3b9d7a9SSarah Sharp } else if (!warm) { 2802d3b9d7a9SSarah Sharp /* 2803d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2804d3b9d7a9SSarah Sharp * double check and see if one is needed. 2805d3b9d7a9SSarah Sharp */ 2806fb6d1f7dSRobert Schlabbach if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) 2807fb6d1f7dSRobert Schlabbach if (hub_port_warm_reset_required(hub, port1, 2808fb6d1f7dSRobert Schlabbach portstatus)) 2809d3b9d7a9SSarah Sharp warm = true; 281075d7cf72SAndiry Xu } 28113cd12f91SDan Williams clear_bit(port1, hub->warm_reset_bits); 281275d7cf72SAndiry Xu 281375d7cf72SAndiry Xu /* Reset the port */ 281475d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 281575d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 281675d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 281775d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2818e9e88fb7SAlan Stern if (status == -ENODEV) { 2819e9e88fb7SAlan Stern ; /* The hub is gone */ 2820e9e88fb7SAlan Stern } else if (status) { 2821d99f6b41SDan Williams dev_err(&port_dev->dev, 2822d99f6b41SDan Williams "cannot %sreset (err = %d)\n", 2823d99f6b41SDan Williams warm ? "warm " : "", status); 282475d7cf72SAndiry Xu } else { 282575d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 282675d7cf72SAndiry Xu warm); 2827e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 282875d7cf72SAndiry Xu dev_dbg(hub->intfdev, 282975d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 283075d7cf72SAndiry Xu status); 283175d7cf72SAndiry Xu } 283275d7cf72SAndiry Xu 2833a24a6078SSarah Sharp /* Check for disconnect or reset */ 283475d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2835fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2836fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_RESET); 2837a24a6078SSarah Sharp 2838a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 283932fe0198SAlan Stern goto done; 2840a24a6078SSarah Sharp 2841fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2842fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_BH_PORT_RESET); 2843fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2844fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_PORT_LINK_STATE); 2845fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2846fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_CONNECTION); 2847fb6d1f7dSRobert Schlabbach 2848a24a6078SSarah Sharp /* 2849a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2850a24a6078SSarah Sharp * state, re-issue the warm reset. 2851a24a6078SSarah Sharp */ 2852a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2853a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2854a24a6078SSarah Sharp goto done; 2855a24a6078SSarah Sharp 28563cd12f91SDan Williams if (!hub_port_warm_reset_required(hub, port1, 28573cd12f91SDan Williams portstatus)) 2858a24a6078SSarah Sharp goto done; 2859a24a6078SSarah Sharp 2860a24a6078SSarah Sharp /* 2861a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2862a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2863a24a6078SSarah Sharp */ 2864a24a6078SSarah Sharp if (!warm) { 2865d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2866d99f6b41SDan Williams "hot reset failed, warm reset\n"); 2867a24a6078SSarah Sharp warm = true; 2868a24a6078SSarah Sharp } 28691da177e4SLinus Torvalds } 28701da177e4SLinus Torvalds 2871d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2872d99f6b41SDan Williams "not enabled, trying %sreset again...\n", 2873d99f6b41SDan Williams warm ? "warm " : ""); 28741da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 28751da177e4SLinus Torvalds } 28761da177e4SLinus Torvalds 2877d99f6b41SDan Williams dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); 28781da177e4SLinus Torvalds 287932fe0198SAlan Stern done: 2880fb6d1f7dSRobert Schlabbach if (status == 0) { 2881fb6d1f7dSRobert Schlabbach /* TRSTRCY = 10 ms; plus some extra */ 2882aa071a92SNicolas Boichat if (port_dev->quirks & USB_PORT_QUIRK_FAST_ENUM) 2883aa071a92SNicolas Boichat usleep_range(10000, 12000); 2884aa071a92SNicolas Boichat else 2885fb6d1f7dSRobert Schlabbach msleep(10 + 40); 2886aa071a92SNicolas Boichat 2887fb6d1f7dSRobert Schlabbach if (udev) { 2888fb6d1f7dSRobert Schlabbach struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2889fb6d1f7dSRobert Schlabbach 2890fb6d1f7dSRobert Schlabbach update_devnum(udev, 0); 2891fb6d1f7dSRobert Schlabbach /* The xHC may think the device is already reset, 2892fb6d1f7dSRobert Schlabbach * so ignore the status. 2893fb6d1f7dSRobert Schlabbach */ 2894fb6d1f7dSRobert Schlabbach if (hcd->driver->reset_device) 2895fb6d1f7dSRobert Schlabbach hcd->driver->reset_device(hcd, udev); 2896fb6d1f7dSRobert Schlabbach 2897fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_DEFAULT); 2898fb6d1f7dSRobert Schlabbach } 2899fb6d1f7dSRobert Schlabbach } else { 2900fb6d1f7dSRobert Schlabbach if (udev) 2901fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_NOTATTACHED); 2902fb6d1f7dSRobert Schlabbach } 2903fb6d1f7dSRobert Schlabbach 29040fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 290532fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 290675d7cf72SAndiry Xu 29071da177e4SLinus Torvalds return status; 29081da177e4SLinus Torvalds } 29091da177e4SLinus Torvalds 29100ed9a57eSAndiry Xu /* Check if a port is power on */ 29110ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 29120ed9a57eSAndiry Xu { 29130ed9a57eSAndiry Xu int ret = 0; 29140ed9a57eSAndiry Xu 29150ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 29160ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 29170ed9a57eSAndiry Xu ret = 1; 29180ed9a57eSAndiry Xu } else { 29190ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 29200ed9a57eSAndiry Xu ret = 1; 29210ed9a57eSAndiry Xu } 29220ed9a57eSAndiry Xu 29230ed9a57eSAndiry Xu return ret; 29240ed9a57eSAndiry Xu } 29250ed9a57eSAndiry Xu 29265c79a1e3SDan Williams static void usb_lock_port(struct usb_port *port_dev) 29275c79a1e3SDan Williams __acquires(&port_dev->status_lock) 29285c79a1e3SDan Williams { 29295c79a1e3SDan Williams mutex_lock(&port_dev->status_lock); 29305c79a1e3SDan Williams __acquire(&port_dev->status_lock); 29315c79a1e3SDan Williams } 29325c79a1e3SDan Williams 29335c79a1e3SDan Williams static void usb_unlock_port(struct usb_port *port_dev) 29345c79a1e3SDan Williams __releases(&port_dev->status_lock) 29355c79a1e3SDan Williams { 29365c79a1e3SDan Williams mutex_unlock(&port_dev->status_lock); 29375c79a1e3SDan Williams __release(&port_dev->status_lock); 29385c79a1e3SDan Williams } 29395c79a1e3SDan Williams 2940d388dab7SAlan Stern #ifdef CONFIG_PM 29411da177e4SLinus Torvalds 29420ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 29430ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 29440ed9a57eSAndiry Xu { 29450ed9a57eSAndiry Xu int ret = 0; 29460ed9a57eSAndiry Xu 29470ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 29480ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 29490ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 29500ed9a57eSAndiry Xu ret = 1; 29510ed9a57eSAndiry Xu } else { 29520ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 29530ed9a57eSAndiry Xu ret = 1; 29540ed9a57eSAndiry Xu } 29550ed9a57eSAndiry Xu 29560ed9a57eSAndiry Xu return ret; 29570ed9a57eSAndiry Xu } 2958b01b03f3SAlan Stern 2959b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2960b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2961b01b03f3SAlan Stern */ 2962b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2963b01b03f3SAlan Stern struct usb_hub *hub, int port1, 29647fa40910SJulius Werner int status, u16 portchange, u16 portstatus) 2965b01b03f3SAlan Stern { 2966d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 29677fa40910SJulius Werner int retries = 3; 2968d99f6b41SDan Williams 29697fa40910SJulius Werner retry: 29703cd12f91SDan Williams /* Is a warm reset needed to recover the connection? */ 29713cd12f91SDan Williams if (status == 0 && udev->reset_resume 29723cd12f91SDan Williams && hub_port_warm_reset_required(hub, port1, portstatus)) { 29733cd12f91SDan Williams /* pass */; 29743cd12f91SDan Williams } 2975b01b03f3SAlan Stern /* Is the device still present? */ 29763cd12f91SDan Williams else if (status || port_is_suspended(hub, portstatus) || 29777fa40910SJulius Werner !port_is_power_on(hub, portstatus)) { 2978b01b03f3SAlan Stern if (status >= 0) 2979b01b03f3SAlan Stern status = -ENODEV; 29807fa40910SJulius Werner } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 29817fa40910SJulius Werner if (retries--) { 29827fa40910SJulius Werner usleep_range(200, 300); 29837fa40910SJulius Werner status = hub_port_status(hub, port1, &portstatus, 29847fa40910SJulius Werner &portchange); 29857fa40910SJulius Werner goto retry; 29867fa40910SJulius Werner } 29877fa40910SJulius Werner status = -ENODEV; 2988b01b03f3SAlan Stern } 2989b01b03f3SAlan Stern 299086c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 299186c57edfSAlan Stern * so try a reset-resume instead. 299286c57edfSAlan Stern */ 299386c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 299486c57edfSAlan Stern if (udev->persist_enabled) 299586c57edfSAlan Stern udev->reset_resume = 1; 299686c57edfSAlan Stern else 2997b01b03f3SAlan Stern status = -ENODEV; 299886c57edfSAlan Stern } 2999b01b03f3SAlan Stern 3000b01b03f3SAlan Stern if (status) { 3001d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", 3002d99f6b41SDan Williams portchange, portstatus, status); 3003b01b03f3SAlan Stern } else if (udev->reset_resume) { 3004b01b03f3SAlan Stern 3005b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 3006b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 3007ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3008b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 3009b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 3010ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3011b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 3012b01b03f3SAlan Stern } 3013b01b03f3SAlan Stern 3014b01b03f3SAlan Stern return status; 3015b01b03f3SAlan Stern } 3016b01b03f3SAlan Stern 3017f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3018f74631e3SSarah Sharp { 3019f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 3020f74631e3SSarah Sharp 3021f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 3022f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 3023f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 3024f74631e3SSarah Sharp return 0; 3025f74631e3SSarah Sharp 3026f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 3027f74631e3SSarah Sharp * configured. 3028f74631e3SSarah Sharp */ 3029f74631e3SSarah Sharp if (!udev->actconfig) 3030f74631e3SSarah Sharp return 0; 3031f74631e3SSarah Sharp 3032f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 3033f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 3034f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 3035f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 3036f74631e3SSarah Sharp } 3037f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3038f74631e3SSarah Sharp 3039f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 3040f74631e3SSarah Sharp { 3041f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 3042f74631e3SSarah Sharp 3043f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 3044f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 3045f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 3046f74631e3SSarah Sharp return; 3047f74631e3SSarah Sharp 3048f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 3049f74631e3SSarah Sharp * configured. 3050f74631e3SSarah Sharp */ 3051f74631e3SSarah Sharp if (!udev->actconfig) 3052f74631e3SSarah Sharp return; 3053f74631e3SSarah Sharp 3054f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 3055f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 3056f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 3057f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 3058f74631e3SSarah Sharp } 3059f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3060f74631e3SSarah Sharp 306154a3ac0cSLan Tianyu /* 306228e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 306354a3ac0cSLan Tianyu * @udev: target device 306454a3ac0cSLan Tianyu * 306528e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 306628e86165SAlan Stern * 306728e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 306828e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 306928e86165SAlan Stern * association descriptor shows there's more than one function. 307054a3ac0cSLan Tianyu */ 307128e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 307254a3ac0cSLan Tianyu { 307328e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 307428e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 307528e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 307628e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 307728e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 307828e86165SAlan Stern else 307928e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 308028e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 308128e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 308228e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 308328e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 308428e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 308528e86165SAlan Stern } 308628e86165SAlan Stern 308728e86165SAlan Stern /* 308828e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 308928e86165SAlan Stern * @udev: target device 309028e86165SAlan Stern * 309128e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 309228e86165SAlan Stern * 309328e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 309428e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 309528e86165SAlan Stern * association descriptor shows there's more than one function. 309628e86165SAlan Stern */ 309728e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 309828e86165SAlan Stern { 309928e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 310028e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 310128e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 310228e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 310328e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 310428e86165SAlan Stern else 310554a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 31064e248000SYonglong Wu USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 310754a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 310854a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 310954a3ac0cSLan Tianyu } 31101da177e4SLinus Torvalds 3111e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 3112e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 3113e583d9dbSAlan Stern { 3114e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 3115e583d9dbSAlan Stern 3116e583d9dbSAlan Stern return udev->do_remote_wakeup + 3117e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 3118e583d9dbSAlan Stern } 3119e583d9dbSAlan Stern 31201da177e4SLinus Torvalds /* 3121140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 3122624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 31235edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 31241da177e4SLinus Torvalds * 31251da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 31261da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 31271da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 3128140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 31291da177e4SLinus Torvalds * to disconnect devices while they are suspended. 31301da177e4SLinus Torvalds * 3131390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 3132390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 3133390a8c34SDavid Brownell * 3134624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 3135624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 3136624d6c07SAlan Stern * All devices below the suspended port are also suspended. 3137624d6c07SAlan Stern * 3138624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 3139624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 3140624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 3141624d6c07SAlan Stern * some cases, this wakes the USB host. 3142624d6c07SAlan Stern * 31431da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 31441da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 31451da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 31461da177e4SLinus Torvalds * 31474956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 31484956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 31494956eccdSAlan Stern * State transitions include: 31504956eccdSAlan Stern * 31514956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 31524956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 31534956eccdSAlan Stern * 31544956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 31554956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 31564956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 315737ebb549SPetr Mladek * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq 31584956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 31594956eccdSAlan Stern * 3160e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 3161e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 31620aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 31630aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 31640aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 31654956eccdSAlan Stern * 31661da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 31671da177e4SLinus Torvalds */ 316865bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 31691da177e4SLinus Torvalds { 3170ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3171ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3172624d6c07SAlan Stern int port1 = udev->portnum; 3173624d6c07SAlan Stern int status; 31740aa2832dSAlan Stern bool really_suspend = true; 31754956eccdSAlan Stern 31765c79a1e3SDan Williams usb_lock_port(port_dev); 31775c79a1e3SDan Williams 3178624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 3179624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 3180624d6c07SAlan Stern * 3181624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 3182624d6c07SAlan Stern * we don't explicitly enable it here. 3183624d6c07SAlan Stern */ 3184624d6c07SAlan Stern if (udev->do_remote_wakeup) { 318528e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 31860c487206SOliver Neukum if (status) { 3187624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 3188624d6c07SAlan Stern status); 31890c487206SOliver Neukum /* bail if autosuspend is requested */ 31905b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 31914fae6f0fSAlan Stern goto err_wakeup; 31920c487206SOliver Neukum } 3193624d6c07SAlan Stern } 3194624d6c07SAlan Stern 319565580b43SAndiry Xu /* disable USB2 hardware LPM */ 319665580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 319765580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 319865580b43SAndiry Xu 3199f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 32001ccc417eSJoe Perches dev_err(&udev->dev, "Failed to disable LTM before suspend\n"); 32014fae6f0fSAlan Stern status = -ENOMEM; 32024fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 32034fae6f0fSAlan Stern goto err_ltm; 3204f74631e3SSarah Sharp } 32058306095fSSarah Sharp 3206624d6c07SAlan Stern /* see 7.1.7.6 */ 3207a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3208c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3209e583d9dbSAlan Stern 32100aa2832dSAlan Stern /* 32110aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 32120aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 32130aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 32140aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3215e583d9dbSAlan Stern * 3216e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3217e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3218e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3219e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 32200aa2832dSAlan Stern */ 3221e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3222e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3223e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 32240aa2832dSAlan Stern else { 32250aa2832dSAlan Stern really_suspend = false; 32260aa2832dSAlan Stern status = 0; 32270aa2832dSAlan Stern } 3228624d6c07SAlan Stern if (status) { 3229d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); 3230cbb33004SAlan Stern 3231d590c231SMathias Nyman /* Try to enable USB3 LTM again */ 32324fae6f0fSAlan Stern usb_enable_ltm(udev); 32334fae6f0fSAlan Stern err_ltm: 3234c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3235c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3236c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3237c3e751e4SAndiry Xu 32384fae6f0fSAlan Stern if (udev->do_remote_wakeup) 32394fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 32404fae6f0fSAlan Stern err_wakeup: 32418306095fSSarah Sharp 3242cbb33004SAlan Stern /* System sleep transitions should never fail */ 32435b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3244cbb33004SAlan Stern status = 0; 3245624d6c07SAlan Stern } else { 324630b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 324730b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 324830b1a7a3SAlan Stern udev->do_remote_wakeup); 32490aa2832dSAlan Stern if (really_suspend) { 3250bfd1e910SAlan Stern udev->port_is_suspended = 1; 3251e583d9dbSAlan Stern 3252e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3253624d6c07SAlan Stern msleep(10); 3254624d6c07SAlan Stern } 3255e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 32560aa2832dSAlan Stern } 3257ad493e5eSLan Tianyu 3258d5c3834eSDan Williams if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled 3259d5c3834eSDan Williams && test_and_clear_bit(port1, hub->child_usage_bits)) 3260ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3261ad493e5eSLan Tianyu 3262c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 32635c79a1e3SDan Williams 32645c79a1e3SDan Williams usb_unlock_port(port_dev); 32654956eccdSAlan Stern return status; 32661da177e4SLinus Torvalds } 3267f3f3253dSDavid Brownell 32681da177e4SLinus Torvalds /* 3269390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3270390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 327154515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 32721da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 32731da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 32741da177e4SLinus Torvalds * in the tree that's rooted at this device. 327554515fe5SAlan Stern * 327654515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 327754515fe5SAlan Stern * status check is done. 32781da177e4SLinus Torvalds */ 3279140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 32801da177e4SLinus Torvalds { 328154515fe5SAlan Stern int status = 0; 328207e72b95SOliver Neukum u16 devstatus = 0; 32831da177e4SLinus Torvalds 32841da177e4SLinus Torvalds /* caller owns the udev device lock */ 3285b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3286b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 32871da177e4SLinus Torvalds 32881da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 32891da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 32901da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 329137ebb549SPetr Mladek * during many timeouts, but hub_wq can't suspend until later. 32921da177e4SLinus Torvalds */ 32931da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 32941da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 32951da177e4SLinus Torvalds : USB_STATE_ADDRESS); 32961da177e4SLinus Torvalds 329754515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 329854515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 329954515fe5SAlan Stern * operation is carried out here, after the port has been 330054515fe5SAlan Stern * resumed. 330154515fe5SAlan Stern */ 33021d10255cSAlan Stern if (udev->reset_resume) { 33031d10255cSAlan Stern /* 33041d10255cSAlan Stern * If the device morphs or switches modes when it is reset, 33051d10255cSAlan Stern * we don't want to perform a reset-resume. We'll fail the 33061d10255cSAlan Stern * resume, which will cause a logical disconnect, and then 33071d10255cSAlan Stern * the device will be rediscovered. 33081d10255cSAlan Stern */ 330986c57edfSAlan Stern retry_reset_resume: 33101d10255cSAlan Stern if (udev->quirks & USB_QUIRK_RESET) 33111d10255cSAlan Stern status = -ENODEV; 33121d10255cSAlan Stern else 3313742120c6SMing Lei status = usb_reset_and_verify_device(udev); 33141d10255cSAlan Stern } 331554515fe5SAlan Stern 33161da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 33171da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 33181da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 33191da177e4SLinus Torvalds */ 332054515fe5SAlan Stern if (status == 0) { 332146dede46SAlan Stern devstatus = 0; 3322d9e1e148SFelipe Balbi status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 332386c57edfSAlan Stern 332486c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 332586c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 332686c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 332786c57edfSAlan Stern udev->reset_resume = 1; 332886c57edfSAlan Stern goto retry_reset_resume; 332986c57edfSAlan Stern } 333054515fe5SAlan Stern } 3331b40b7a90SAlan Stern 3332624d6c07SAlan Stern if (status) { 3333624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 33341da177e4SLinus Torvalds status); 333507e72b95SOliver Neukum /* 333607e72b95SOliver Neukum * There are a few quirky devices which violate the standard 333707e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 333807e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 333907e72b95SOliver Neukum * udev->reset_resume 334007e72b95SOliver Neukum */ 334107e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 334228e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 334354a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 334428e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 334554a3ac0cSLan Tianyu } else { 3346d9e1e148SFelipe Balbi status = usb_get_std_status(udev, USB_RECIP_INTERFACE, 0, 334754a3ac0cSLan Tianyu &devstatus); 334854a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 334954a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 335028e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 335154a3ac0cSLan Tianyu } 335254a3ac0cSLan Tianyu 3353a8e7c565SAlan Stern if (status) 3354b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3355b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3356b9cef6c3SWu Fengguang status); 33571da177e4SLinus Torvalds status = 0; 33581da177e4SLinus Torvalds } 33591da177e4SLinus Torvalds return status; 33601da177e4SLinus Torvalds } 33611da177e4SLinus Torvalds 3362624d6c07SAlan Stern /* 3363a40178b2SPratyush Anand * There are some SS USB devices which take longer time for link training. 3364a40178b2SPratyush Anand * XHCI specs 4.19.4 says that when Link training is successful, port 33656b82b122SAl Cooper * sets CCS bit to 1. So if SW reads port status before successful link 3366a40178b2SPratyush Anand * training, then it will not find device to be present. 3367a40178b2SPratyush Anand * USB Analyzer log with such buggy devices show that in some cases 3368a40178b2SPratyush Anand * device switch on the RX termination after long delay of host enabling 3369a40178b2SPratyush Anand * the VBUS. In few other cases it has been seen that device fails to 3370a40178b2SPratyush Anand * negotiate link training in first attempt. It has been 3371a40178b2SPratyush Anand * reported till now that few devices take as long as 2000 ms to train 3372a40178b2SPratyush Anand * the link after host enabling its VBUS and termination. Following 3373a40178b2SPratyush Anand * routine implements a 2000 ms timeout for link training. If in a case 3374a40178b2SPratyush Anand * link trains before timeout, loop will exit earlier. 3375a40178b2SPratyush Anand * 33766b82b122SAl Cooper * There are also some 2.0 hard drive based devices and 3.0 thumb 33776b82b122SAl Cooper * drives that, when plugged into a 2.0 only port, take a long 33786b82b122SAl Cooper * time to set CCS after VBUS enable. 33796b82b122SAl Cooper * 3380a40178b2SPratyush Anand * FIXME: If a device was connected before suspend, but was removed 3381a40178b2SPratyush Anand * while system was asleep, then the loop in the following routine will 3382a40178b2SPratyush Anand * only exit at timeout. 3383a40178b2SPratyush Anand * 33846b82b122SAl Cooper * This routine should only be called when persist is enabled. 3385a40178b2SPratyush Anand */ 33866b82b122SAl Cooper static int wait_for_connected(struct usb_device *udev, 3387a40178b2SPratyush Anand struct usb_hub *hub, int *port1, 3388a40178b2SPratyush Anand u16 *portchange, u16 *portstatus) 3389a40178b2SPratyush Anand { 3390a40178b2SPratyush Anand int status = 0, delay_ms = 0; 3391a40178b2SPratyush Anand 3392a40178b2SPratyush Anand while (delay_ms < 2000) { 3393a40178b2SPratyush Anand if (status || *portstatus & USB_PORT_STAT_CONNECTION) 3394a40178b2SPratyush Anand break; 33955d111f51SDominik Bozek if (!port_is_power_on(hub, *portstatus)) { 33965d111f51SDominik Bozek status = -ENODEV; 33975d111f51SDominik Bozek break; 33985d111f51SDominik Bozek } 3399a40178b2SPratyush Anand msleep(20); 3400a40178b2SPratyush Anand delay_ms += 20; 3401a40178b2SPratyush Anand status = hub_port_status(hub, *port1, portstatus, portchange); 3402a40178b2SPratyush Anand } 34036b82b122SAl Cooper dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); 3404a40178b2SPratyush Anand return status; 3405a40178b2SPratyush Anand } 3406a40178b2SPratyush Anand 3407a40178b2SPratyush Anand /* 3408624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3409624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3410624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3411624d6c07SAlan Stern * 3412624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3413624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3414624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3415624d6c07SAlan Stern * the host and the device is the same as it was when the device 3416624d6c07SAlan Stern * suspended. 3417624d6c07SAlan Stern * 3418feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3419feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 342054515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 342154515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 342254515fe5SAlan Stern * 342354515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 342454515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 342554515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 342654515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 342754515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 342854515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 342954515fe5SAlan Stern * made to appear as if it had not disconnected. 343054515fe5SAlan Stern * 3431742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3432feccc30dSAlan Stern * every effort to insure that the same device is present after the 343354515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 343454515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 343554515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 343654515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 343754515fe5SAlan Stern * new card is corrupted and the system crashes. 343854515fe5SAlan Stern * 3439624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3440624d6c07SAlan Stern */ 344165bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 34421da177e4SLinus Torvalds { 3443ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3444ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3445624d6c07SAlan Stern int port1 = udev->portnum; 34461da177e4SLinus Torvalds int status; 3447d25450c6SAlan Stern u16 portchange, portstatus; 3448d25450c6SAlan Stern 3449d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) { 3450ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3451ad493e5eSLan Tianyu if (status < 0) { 3452ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3453ad493e5eSLan Tianyu status); 3454ad493e5eSLan Tianyu return status; 3455ad493e5eSLan Tianyu } 3456ad493e5eSLan Tianyu } 3457ad493e5eSLan Tianyu 34585c79a1e3SDan Williams usb_lock_port(port_dev); 34595c79a1e3SDan Williams 3460d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3461d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 346283a62c51SRavi Chandra Sadineni if (status == 0 && !port_is_suspended(hub, portstatus)) { 346383a62c51SRavi Chandra Sadineni if (portchange & USB_PORT_STAT_C_SUSPEND) 346483a62c51SRavi Chandra Sadineni pm_wakeup_event(&udev->dev, 0); 3465d25450c6SAlan Stern goto SuspendCleared; 346683a62c51SRavi Chandra Sadineni } 34671da177e4SLinus Torvalds 34681da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3469a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3470c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3471a7114230SAndiry Xu else 3472ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 34731da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 34741da177e4SLinus Torvalds if (status) { 3475d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); 34761da177e4SLinus Torvalds } else { 3477bbc78c07SFelipe Balbi /* drive resume for USB_RESUME_TIMEOUT msec */ 3478645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 34795b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 3480bbc78c07SFelipe Balbi msleep(USB_RESUME_TIMEOUT); 34811da177e4SLinus Torvalds 34821da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 34831da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 34841da177e4SLinus Torvalds * sequence. 34851da177e4SLinus Torvalds */ 3486d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 348754515fe5SAlan Stern 34881da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 34891da177e4SLinus Torvalds msleep(10); 34901da177e4SLinus Torvalds } 3491b01b03f3SAlan Stern 3492b01b03f3SAlan Stern SuspendCleared: 3493b01b03f3SAlan Stern if (status == 0) { 3494bfd1e910SAlan Stern udev->port_is_suspended = 0; 3495a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3496a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3497ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3498a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3499a7114230SAndiry Xu } else { 3500b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3501ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3502b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 35031da177e4SLinus Torvalds } 3504a7114230SAndiry Xu } 35051da177e4SLinus Torvalds 35066b82b122SAl Cooper if (udev->persist_enabled) 35076b82b122SAl Cooper status = wait_for_connected(udev, hub, &port1, &portchange, 3508a40178b2SPratyush Anand &portstatus); 3509a40178b2SPratyush Anand 3510b01b03f3SAlan Stern status = check_port_resume_type(udev, 3511b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 351254515fe5SAlan Stern if (status == 0) 351354515fe5SAlan Stern status = finish_port_resume(udev); 351454515fe5SAlan Stern if (status < 0) { 351554515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 351654515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 351765580b43SAndiry Xu } else { 351865580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 351965580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 352065580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 35218306095fSSarah Sharp 3522d590c231SMathias Nyman /* Try to enable USB3 LTM */ 3523f74631e3SSarah Sharp usb_enable_ltm(udev); 352454515fe5SAlan Stern } 352565580b43SAndiry Xu 35265c79a1e3SDan Williams usb_unlock_port(port_dev); 35275c79a1e3SDan Williams 35281da177e4SLinus Torvalds return status; 35291da177e4SLinus Torvalds } 35301da177e4SLinus Torvalds 35310534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 35321da177e4SLinus Torvalds { 35331da177e4SLinus Torvalds int status = 0; 35341da177e4SLinus Torvalds 35355c79a1e3SDan Williams usb_lock_device(udev); 35361da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3537645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 35389bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 35399bbdf1e0SAlan Stern if (status == 0) { 35409bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 35419bbdf1e0SAlan Stern usb_autosuspend_device(udev); 35429bbdf1e0SAlan Stern } 3543d25450c6SAlan Stern } 35445c79a1e3SDan Williams usb_unlock_device(udev); 35451da177e4SLinus Torvalds return status; 35461da177e4SLinus Torvalds } 35471da177e4SLinus Torvalds 35487e73be22SDan Williams /* Returns 1 if there was a remote wakeup and a connect status change. */ 35497e73be22SDan Williams static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 35507e73be22SDan Williams u16 portstatus, u16 portchange) 35517e73be22SDan Williams __must_hold(&port_dev->status_lock) 35527e73be22SDan Williams { 35537e73be22SDan Williams struct usb_port *port_dev = hub->ports[port - 1]; 35547e73be22SDan Williams struct usb_device *hdev; 35557e73be22SDan Williams struct usb_device *udev; 35567e73be22SDan Williams int connect_change = 0; 35577e73be22SDan Williams int ret; 35587e73be22SDan Williams 35597e73be22SDan Williams hdev = hub->hdev; 35607e73be22SDan Williams udev = port_dev->child; 35617e73be22SDan Williams if (!hub_is_superspeed(hdev)) { 35627e73be22SDan Williams if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 35637e73be22SDan Williams return 0; 35647e73be22SDan Williams usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 35657e73be22SDan Williams } else { 35667e73be22SDan Williams if (!udev || udev->state != USB_STATE_SUSPENDED || 35677e73be22SDan Williams (portstatus & USB_PORT_STAT_LINK_STATE) != 35687e73be22SDan Williams USB_SS_PORT_LS_U0) 35697e73be22SDan Williams return 0; 35707e73be22SDan Williams } 35717e73be22SDan Williams 35727e73be22SDan Williams if (udev) { 35737e73be22SDan Williams /* TRSMRCY = 10 msec */ 35747e73be22SDan Williams msleep(10); 35757e73be22SDan Williams 35767e73be22SDan Williams usb_unlock_port(port_dev); 35777e73be22SDan Williams ret = usb_remote_wakeup(udev); 35787e73be22SDan Williams usb_lock_port(port_dev); 35797e73be22SDan Williams if (ret < 0) 35807e73be22SDan Williams connect_change = 1; 35817e73be22SDan Williams } else { 35827e73be22SDan Williams ret = -ENODEV; 35837e73be22SDan Williams hub_port_disable(hub, port, 1); 35847e73be22SDan Williams } 35857e73be22SDan Williams dev_dbg(&port_dev->dev, "resume, status %d\n", ret); 35867e73be22SDan Williams return connect_change; 35877e73be22SDan Williams } 35887e73be22SDan Williams 3589e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3590e6f30deaSMing Lei { 3591e6f30deaSMing Lei int port1; 3592e6f30deaSMing Lei 3593e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3594e6f30deaSMing Lei u16 portstatus, portchange; 3595e6f30deaSMing Lei int status; 3596e6f30deaSMing Lei 3597e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3598e6f30deaSMing Lei if (!status && portchange) 3599e6f30deaSMing Lei return 1; 3600e6f30deaSMing Lei } 3601e6f30deaSMing Lei return 0; 3602e6f30deaSMing Lei } 3603e6f30deaSMing Lei 3604db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 36051da177e4SLinus Torvalds { 36061da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 36071da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 36081da177e4SLinus Torvalds unsigned port1; 36094296c70aSSarah Sharp int status; 36101da177e4SLinus Torvalds 3611e583d9dbSAlan Stern /* 3612e583d9dbSAlan Stern * Warn if children aren't already suspended. 3613e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3614e583d9dbSAlan Stern */ 3615e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 36161da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 3617d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 3618d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 36191da177e4SLinus Torvalds 36206840d255SAlan Stern if (udev && udev->can_submit) { 3621b658b8f5SDan Williams dev_warn(&port_dev->dev, "device %s not suspended yet\n", 3622b658b8f5SDan Williams dev_name(&udev->dev)); 36235b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3624c9f89fa4SDavid Brownell return -EBUSY; 3625c9f89fa4SDavid Brownell } 3626e583d9dbSAlan Stern if (udev) 3627e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3628e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 36291da177e4SLinus Torvalds } 3630e6f30deaSMing Lei 3631e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3632e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3633e6f30deaSMing Lei if (check_ports_changed(hub)) { 3634e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3635e6f30deaSMing Lei return -EBUSY; 3636e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3637e6f30deaSMing Lei } 3638e6f30deaSMing Lei } 3639e6f30deaSMing Lei 36404296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 36414296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 36424296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 36434296c70aSSarah Sharp status = set_port_feature(hdev, 36444296c70aSSarah Sharp port1 | 36454296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 36464296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 36474296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 36484296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 36494296c70aSSarah Sharp } 36504296c70aSSarah Sharp } 36511da177e4SLinus Torvalds 3652441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 365340f122f3SAlan Stern 365437ebb549SPetr Mladek /* stop hub_wq and related activity */ 36554330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3656b6f6436dSAlan Stern return 0; 36571da177e4SLinus Torvalds } 36581da177e4SLinus Torvalds 36591da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 36601da177e4SLinus Torvalds { 36611da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 36621da177e4SLinus Torvalds 36635e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3664f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 36651da177e4SLinus Torvalds return 0; 36661da177e4SLinus Torvalds } 36671da177e4SLinus Torvalds 3668b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3669f07600cfSAlan Stern { 3670b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3671f07600cfSAlan Stern 36725e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3673f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3674f07600cfSAlan Stern return 0; 3675f07600cfSAlan Stern } 3676f07600cfSAlan Stern 367754515fe5SAlan Stern /** 367854515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 367954515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 368054515fe5SAlan Stern * 368154515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 368254515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3683feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3684feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3685feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3686feccc30dSAlan Stern * the others will be disconnected. 368754515fe5SAlan Stern */ 368854515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 368954515fe5SAlan Stern { 36900442d7b0STomeu Vizoso dev_notice(&rhdev->dev, "root hub lost power or was reset\n"); 369154515fe5SAlan Stern rhdev->reset_resume = 1; 369254515fe5SAlan Stern } 369354515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 369454515fe5SAlan Stern 36951ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 36961ea7e0e8SSarah Sharp "U0", 36971ea7e0e8SSarah Sharp "U1", 36981ea7e0e8SSarah Sharp "U2", 36991ea7e0e8SSarah Sharp "U3", 37001ea7e0e8SSarah Sharp }; 37011ea7e0e8SSarah Sharp 37021ea7e0e8SSarah Sharp /* 37031ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 37041ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 37051ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 37061ea7e0e8SSarah Sharp * packet from the host. 37071ea7e0e8SSarah Sharp * 37081ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 37091ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 37101ea7e0e8SSarah Sharp */ 37111ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 37121ea7e0e8SSarah Sharp { 37131ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 37141ea7e0e8SSarah Sharp unsigned long long u1_sel; 37151ea7e0e8SSarah Sharp unsigned long long u1_pel; 37161ea7e0e8SSarah Sharp unsigned long long u2_sel; 37171ea7e0e8SSarah Sharp unsigned long long u2_pel; 37181ea7e0e8SSarah Sharp int ret; 37191ea7e0e8SSarah Sharp 372038d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 372138d7f688SXenia Ragiadakou return 0; 372238d7f688SXenia Ragiadakou 37231ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 37241ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 37251ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 37261ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 37271ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 37281ea7e0e8SSarah Sharp 37291ea7e0e8SSarah Sharp /* 37301ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 37311ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 37321ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 37331ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 37341ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 37351ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 37361ea7e0e8SSarah Sharp */ 37371ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 37381ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 37391ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 37401ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 37411ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 37421ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 37431510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 37441ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 37451ea7e0e8SSarah Sharp return -EINVAL; 37461ea7e0e8SSarah Sharp } 37471ea7e0e8SSarah Sharp 37481ea7e0e8SSarah Sharp /* 37491ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 37501ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 37511ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 37521ea7e0e8SSarah Sharp */ 37531ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 37541ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 37551ea7e0e8SSarah Sharp 37561ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 37571ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 37581ea7e0e8SSarah Sharp 37591ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 37601ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 37611ea7e0e8SSarah Sharp 37621ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 37631ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 37641ea7e0e8SSarah Sharp 37651ea7e0e8SSarah Sharp /* 37661ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 37671ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 37681ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 37691ea7e0e8SSarah Sharp */ 37701ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 37711ea7e0e8SSarah Sharp if (!sel_values) 37721ea7e0e8SSarah Sharp return -ENOMEM; 37731ea7e0e8SSarah Sharp 37741ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 37751ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 37761ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 37771ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 37781ea7e0e8SSarah Sharp 37791ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37801ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 37811ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37821ea7e0e8SSarah Sharp 0, 0, 37831ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 37841ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37851ea7e0e8SSarah Sharp kfree(sel_values); 37861ea7e0e8SSarah Sharp return ret; 37871ea7e0e8SSarah Sharp } 37881ea7e0e8SSarah Sharp 37891ea7e0e8SSarah Sharp /* 37901ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 37911ea7e0e8SSarah Sharp */ 37921ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 37931ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 37941ea7e0e8SSarah Sharp { 37951ea7e0e8SSarah Sharp int ret; 37961ea7e0e8SSarah Sharp int feature; 37971ea7e0e8SSarah Sharp 37981ea7e0e8SSarah Sharp switch (state) { 37991ea7e0e8SSarah Sharp case USB3_LPM_U1: 38001ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 38011ea7e0e8SSarah Sharp break; 38021ea7e0e8SSarah Sharp case USB3_LPM_U2: 38031ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 38041ea7e0e8SSarah Sharp break; 38051ea7e0e8SSarah Sharp default: 38061ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 38071ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 38081ea7e0e8SSarah Sharp return -EINVAL; 38091ea7e0e8SSarah Sharp } 38101ea7e0e8SSarah Sharp 38111ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 38121ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 38131ea7e0e8SSarah Sharp "for unconfigured device.\n", 38141ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 38151ea7e0e8SSarah Sharp usb3_lpm_names[state]); 38161ea7e0e8SSarah Sharp return 0; 38171ea7e0e8SSarah Sharp } 38181ea7e0e8SSarah Sharp 38191ea7e0e8SSarah Sharp if (enable) { 38201ea7e0e8SSarah Sharp /* 38211ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 38221ea7e0e8SSarah Sharp * for either U1 or U2. 38231ea7e0e8SSarah Sharp */ 38241ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 38251ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 38261ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 38271ea7e0e8SSarah Sharp feature, 38281ea7e0e8SSarah Sharp 0, NULL, 0, 38291ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 38301ea7e0e8SSarah Sharp } else { 38311ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 38321ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 38331ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 38341ea7e0e8SSarah Sharp feature, 38351ea7e0e8SSarah Sharp 0, NULL, 0, 38361ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 38371ea7e0e8SSarah Sharp } 38381ea7e0e8SSarah Sharp if (ret < 0) { 38391ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 38401ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 38411ea7e0e8SSarah Sharp usb3_lpm_names[state]); 38421ea7e0e8SSarah Sharp return -EBUSY; 38431ea7e0e8SSarah Sharp } 38441ea7e0e8SSarah Sharp return 0; 38451ea7e0e8SSarah Sharp } 38461ea7e0e8SSarah Sharp 38471ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 38481ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 38491ea7e0e8SSarah Sharp { 38501ea7e0e8SSarah Sharp int ret; 38511ea7e0e8SSarah Sharp int feature; 38521ea7e0e8SSarah Sharp 38531ea7e0e8SSarah Sharp switch (state) { 38541ea7e0e8SSarah Sharp case USB3_LPM_U1: 38551ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 38561ea7e0e8SSarah Sharp break; 38571ea7e0e8SSarah Sharp case USB3_LPM_U2: 38581ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 38591ea7e0e8SSarah Sharp break; 38601ea7e0e8SSarah Sharp default: 38611ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 38621ea7e0e8SSarah Sharp __func__); 38631ea7e0e8SSarah Sharp return -EINVAL; 38641ea7e0e8SSarah Sharp } 38651ea7e0e8SSarah Sharp 38661ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 38671ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 38681ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 38691ea7e0e8SSarah Sharp "which is a reserved value.\n", 38701ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 38711ea7e0e8SSarah Sharp return -EINVAL; 38721ea7e0e8SSarah Sharp } 38731ea7e0e8SSarah Sharp 38741ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 38751ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 38761ea7e0e8SSarah Sharp feature); 38771ea7e0e8SSarah Sharp if (ret < 0) { 38781ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 38791ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 38801ea7e0e8SSarah Sharp timeout, ret); 38811ea7e0e8SSarah Sharp return -EBUSY; 38821ea7e0e8SSarah Sharp } 38831ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 38841ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 38851ea7e0e8SSarah Sharp else 38861ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 38871ea7e0e8SSarah Sharp return 0; 38881ea7e0e8SSarah Sharp } 38891ea7e0e8SSarah Sharp 38901ea7e0e8SSarah Sharp /* 38911ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 38921ea7e0e8SSarah Sharp * U1/U2 entry. 38931ea7e0e8SSarah Sharp * 38941ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 38951ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 38961ea7e0e8SSarah Sharp * will be successful. 38971ea7e0e8SSarah Sharp * 38981ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 38991ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 39001ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 39011ea7e0e8SSarah Sharp */ 39021ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 39031ea7e0e8SSarah Sharp enum usb3_link_state state) 39041ea7e0e8SSarah Sharp { 390565a95b75SSarah Sharp int timeout, ret; 3906ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3907ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3908ae8963adSSarah Sharp 3909ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3910ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3911ae8963adSSarah Sharp * state. 3912ae8963adSSarah Sharp */ 3913ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3914ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3915ae8963adSSarah Sharp return; 39161ea7e0e8SSarah Sharp 391765a95b75SSarah Sharp /* 391865a95b75SSarah Sharp * First, let the device know about the exit latencies 391965a95b75SSarah Sharp * associated with the link state we're about to enable. 392065a95b75SSarah Sharp */ 392165a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 392265a95b75SSarah Sharp if (ret < 0) { 392365a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 392465a95b75SSarah Sharp usb3_lpm_names[state]); 392565a95b75SSarah Sharp return; 392665a95b75SSarah Sharp } 392765a95b75SSarah Sharp 39281ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 39291ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 39301ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 39311ea7e0e8SSarah Sharp * link state. 39321ea7e0e8SSarah Sharp */ 39331ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 39341ea7e0e8SSarah Sharp 39351ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 39361ea7e0e8SSarah Sharp if (timeout == 0) 39371ea7e0e8SSarah Sharp return; 39381ea7e0e8SSarah Sharp 39391ea7e0e8SSarah Sharp if (timeout < 0) { 39401ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 39411ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 39421ea7e0e8SSarah Sharp timeout); 39431ea7e0e8SSarah Sharp return; 39441ea7e0e8SSarah Sharp } 39451ea7e0e8SSarah Sharp 3946bf5ce5bfSLu Baolu if (usb_set_lpm_timeout(udev, state, timeout)) { 39471ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 39481ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 39491ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 39501ea7e0e8SSarah Sharp */ 39511ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 3952bf5ce5bfSLu Baolu } else { 3953bf5ce5bfSLu Baolu /* Only a configured device will accept the Set Feature 3954bf5ce5bfSLu Baolu * U1/U2_ENABLE 3955bf5ce5bfSLu Baolu */ 3956bf5ce5bfSLu Baolu if (udev->actconfig) 39571ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 39581ea7e0e8SSarah Sharp 3959bf5ce5bfSLu Baolu /* As soon as usb_set_lpm_timeout(timeout) returns 0, the 3960bf5ce5bfSLu Baolu * hub-initiated LPM is enabled. Thus, LPM is enabled no 3961bf5ce5bfSLu Baolu * matter the result of usb_set_device_initiated_lpm(). 3962bf5ce5bfSLu Baolu * The only difference is whether device is able to initiate 3963bf5ce5bfSLu Baolu * LPM. 3964bf5ce5bfSLu Baolu */ 3965bf5ce5bfSLu Baolu if (state == USB3_LPM_U1) 3966bf5ce5bfSLu Baolu udev->usb3_lpm_u1_enabled = 1; 3967bf5ce5bfSLu Baolu else if (state == USB3_LPM_U2) 3968bf5ce5bfSLu Baolu udev->usb3_lpm_u2_enabled = 1; 3969bf5ce5bfSLu Baolu } 39701ea7e0e8SSarah Sharp } 39711ea7e0e8SSarah Sharp 39721ea7e0e8SSarah Sharp /* 39731ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 39741ea7e0e8SSarah Sharp * U1/U2 entry. 39751ea7e0e8SSarah Sharp * 39761ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 39771ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 39781ea7e0e8SSarah Sharp * 39791ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 39801ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 39811ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 39821ea7e0e8SSarah Sharp * 39831ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 39841ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 39851ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 39861ea7e0e8SSarah Sharp */ 39871ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 39881ea7e0e8SSarah Sharp enum usb3_link_state state) 39891ea7e0e8SSarah Sharp { 39901ea7e0e8SSarah Sharp switch (state) { 39911ea7e0e8SSarah Sharp case USB3_LPM_U1: 39921ea7e0e8SSarah Sharp case USB3_LPM_U2: 39931ea7e0e8SSarah Sharp break; 39941ea7e0e8SSarah Sharp default: 39951ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 39961ea7e0e8SSarah Sharp __func__); 39971ea7e0e8SSarah Sharp return -EINVAL; 39981ea7e0e8SSarah Sharp } 39991ea7e0e8SSarah Sharp 40001ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 40011ea7e0e8SSarah Sharp return -EBUSY; 40021ea7e0e8SSarah Sharp 40031ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 40041ea7e0e8SSarah Sharp 40051ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 40061ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 40071ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 40081ea7e0e8SSarah Sharp usb3_lpm_names[state]); 4009bf5ce5bfSLu Baolu 4010bf5ce5bfSLu Baolu /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM 4011bf5ce5bfSLu Baolu * is disabled. Hub will disallows link to enter U1/U2 as well, 4012bf5ce5bfSLu Baolu * even device is initiating LPM. Hence LPM is disabled if hub LPM 4013bf5ce5bfSLu Baolu * timeout set to 0, no matter device-initiated LPM is disabled or 4014bf5ce5bfSLu Baolu * not. 4015bf5ce5bfSLu Baolu */ 4016bf5ce5bfSLu Baolu if (state == USB3_LPM_U1) 4017bf5ce5bfSLu Baolu udev->usb3_lpm_u1_enabled = 0; 4018bf5ce5bfSLu Baolu else if (state == USB3_LPM_U2) 4019bf5ce5bfSLu Baolu udev->usb3_lpm_u2_enabled = 0; 4020bf5ce5bfSLu Baolu 40211ea7e0e8SSarah Sharp return 0; 40221ea7e0e8SSarah Sharp } 40231ea7e0e8SSarah Sharp 40241ea7e0e8SSarah Sharp /* 40251ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 40261ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 40271ea7e0e8SSarah Sharp * 40281ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 40291ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 40301ea7e0e8SSarah Sharp */ 40311ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 40321ea7e0e8SSarah Sharp { 40331ea7e0e8SSarah Sharp struct usb_hcd *hcd; 40341ea7e0e8SSarah Sharp 40351ea7e0e8SSarah Sharp if (!udev || !udev->parent || 40368a1b2725SMathias Nyman udev->speed < USB_SPEED_SUPER || 403751df62ffSPratyush Anand !udev->lpm_capable || 403851df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 40391ea7e0e8SSarah Sharp return 0; 40401ea7e0e8SSarah Sharp 40411ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 40421ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 40431ea7e0e8SSarah Sharp return 0; 40441ea7e0e8SSarah Sharp 40451ea7e0e8SSarah Sharp udev->lpm_disable_count++; 404655558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 40471ea7e0e8SSarah Sharp return 0; 40481ea7e0e8SSarah Sharp 40491ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 40501ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 40511ea7e0e8SSarah Sharp goto enable_lpm; 40521ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 40531ea7e0e8SSarah Sharp goto enable_lpm; 40541ea7e0e8SSarah Sharp 40551ea7e0e8SSarah Sharp return 0; 40561ea7e0e8SSarah Sharp 40571ea7e0e8SSarah Sharp enable_lpm: 40581ea7e0e8SSarah Sharp usb_enable_lpm(udev); 40591ea7e0e8SSarah Sharp return -EBUSY; 40601ea7e0e8SSarah Sharp } 40611ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 40621ea7e0e8SSarah Sharp 40631ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 40641ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 40651ea7e0e8SSarah Sharp { 40661ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 40671ea7e0e8SSarah Sharp int ret; 40681ea7e0e8SSarah Sharp 40691ea7e0e8SSarah Sharp if (!hcd) 40701ea7e0e8SSarah Sharp return -EINVAL; 40711ea7e0e8SSarah Sharp 40721ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 40731ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 40741ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 40751ea7e0e8SSarah Sharp 40761ea7e0e8SSarah Sharp return ret; 40771ea7e0e8SSarah Sharp } 40781ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 40791ea7e0e8SSarah Sharp 40801ea7e0e8SSarah Sharp /* 40811ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 40821ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 40831ea7e0e8SSarah Sharp * 40841ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 40851ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 40861ea7e0e8SSarah Sharp * bandwidth_mutex. 40871ea7e0e8SSarah Sharp */ 40881ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 40891ea7e0e8SSarah Sharp { 40901ea7e0e8SSarah Sharp struct usb_hcd *hcd; 4091513072d9SLu Baolu struct usb_hub *hub; 4092513072d9SLu Baolu struct usb_port *port_dev; 40931ea7e0e8SSarah Sharp 40941ea7e0e8SSarah Sharp if (!udev || !udev->parent || 40958a1b2725SMathias Nyman udev->speed < USB_SPEED_SUPER || 409651df62ffSPratyush Anand !udev->lpm_capable || 409751df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 40981ea7e0e8SSarah Sharp return; 40991ea7e0e8SSarah Sharp 41001ea7e0e8SSarah Sharp udev->lpm_disable_count--; 41011ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 41021ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 41031ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 41041ea7e0e8SSarah Sharp */ 41051ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 41061ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 41071ea7e0e8SSarah Sharp return; 41081ea7e0e8SSarah Sharp 41091ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 41101ea7e0e8SSarah Sharp return; 41111ea7e0e8SSarah Sharp 4112513072d9SLu Baolu hub = usb_hub_to_struct_hub(udev->parent); 4113513072d9SLu Baolu if (!hub) 4114513072d9SLu Baolu return; 4115513072d9SLu Baolu 4116513072d9SLu Baolu port_dev = hub->ports[udev->portnum - 1]; 4117513072d9SLu Baolu 4118513072d9SLu Baolu if (port_dev->usb3_lpm_u1_permit) 41191ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 4120513072d9SLu Baolu 4121513072d9SLu Baolu if (port_dev->usb3_lpm_u2_permit) 41221ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 41231ea7e0e8SSarah Sharp } 41241ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 41251ea7e0e8SSarah Sharp 41261ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 41271ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 41281ea7e0e8SSarah Sharp { 41291ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 41301ea7e0e8SSarah Sharp 41311ea7e0e8SSarah Sharp if (!hcd) 41321ea7e0e8SSarah Sharp return; 41331ea7e0e8SSarah Sharp 41341ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 41351ea7e0e8SSarah Sharp usb_enable_lpm(udev); 41361ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 41371ea7e0e8SSarah Sharp } 41381ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 41391ea7e0e8SSarah Sharp 414037be6676SMathias Nyman /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */ 414137be6676SMathias Nyman static void hub_usb3_port_prepare_disable(struct usb_hub *hub, 414237be6676SMathias Nyman struct usb_port *port_dev) 414337be6676SMathias Nyman { 414437be6676SMathias Nyman struct usb_device *udev = port_dev->child; 414537be6676SMathias Nyman int ret; 414637be6676SMathias Nyman 414737be6676SMathias Nyman if (udev && udev->port_is_suspended && udev->do_remote_wakeup) { 414837be6676SMathias Nyman ret = hub_set_port_link_state(hub, port_dev->portnum, 414937be6676SMathias Nyman USB_SS_PORT_LS_U0); 415037be6676SMathias Nyman if (!ret) { 415137be6676SMathias Nyman msleep(USB_RESUME_TIMEOUT); 415237be6676SMathias Nyman ret = usb_disable_remote_wakeup(udev); 415337be6676SMathias Nyman } 415437be6676SMathias Nyman if (ret) 415537be6676SMathias Nyman dev_warn(&udev->dev, 415637be6676SMathias Nyman "Port disable: can't disable remote wake\n"); 415737be6676SMathias Nyman udev->do_remote_wakeup = 0; 415837be6676SMathias Nyman } 415937be6676SMathias Nyman } 41601ea7e0e8SSarah Sharp 4161d388dab7SAlan Stern #else /* CONFIG_PM */ 4162d388dab7SAlan Stern 4163511366daSAndrew Morton #define hub_suspend NULL 4164511366daSAndrew Morton #define hub_resume NULL 4165f07600cfSAlan Stern #define hub_reset_resume NULL 41661ea7e0e8SSarah Sharp 416737be6676SMathias Nyman static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub, 416837be6676SMathias Nyman struct usb_port *port_dev) { } 416937be6676SMathias Nyman 41701ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 41711ea7e0e8SSarah Sharp { 41721ea7e0e8SSarah Sharp return 0; 41731ea7e0e8SSarah Sharp } 4174e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 41751ea7e0e8SSarah Sharp 41761ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 4177e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 41781ea7e0e8SSarah Sharp 41791ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 41801ea7e0e8SSarah Sharp { 41811ea7e0e8SSarah Sharp return 0; 41821ea7e0e8SSarah Sharp } 4183e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 41841ea7e0e8SSarah Sharp 41851ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 4186e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 4187f74631e3SSarah Sharp 4188f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 4189f74631e3SSarah Sharp { 4190f74631e3SSarah Sharp return 0; 4191f74631e3SSarah Sharp } 4192f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 4193f74631e3SSarah Sharp 4194f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 4195f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 4196c4b51a43SAlan Stern 41974a95b1fcSStephen Rothwell static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 41984a95b1fcSStephen Rothwell u16 portstatus, u16 portchange) 41994a95b1fcSStephen Rothwell { 42004a95b1fcSStephen Rothwell return 0; 42014a95b1fcSStephen Rothwell } 42024a95b1fcSStephen Rothwell 4203c4b51a43SAlan Stern #endif /* CONFIG_PM */ 4204d388dab7SAlan Stern 42053bc02bceSGeert Uytterhoeven /* 42063bc02bceSGeert Uytterhoeven * USB-3 does not have a similar link state as USB-2 that will avoid negotiating 42073bc02bceSGeert Uytterhoeven * a connection with a plugged-in cable but will signal the host when the cable 42083bc02bceSGeert Uytterhoeven * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices 42093bc02bceSGeert Uytterhoeven */ 42103bc02bceSGeert Uytterhoeven static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 42113bc02bceSGeert Uytterhoeven { 42123bc02bceSGeert Uytterhoeven struct usb_port *port_dev = hub->ports[port1 - 1]; 42133bc02bceSGeert Uytterhoeven struct usb_device *hdev = hub->hdev; 42143bc02bceSGeert Uytterhoeven int ret = 0; 42153bc02bceSGeert Uytterhoeven 42163bc02bceSGeert Uytterhoeven if (!hub->error) { 42173bc02bceSGeert Uytterhoeven if (hub_is_superspeed(hub->hdev)) { 42183bc02bceSGeert Uytterhoeven hub_usb3_port_prepare_disable(hub, port_dev); 42193bc02bceSGeert Uytterhoeven ret = hub_set_port_link_state(hub, port_dev->portnum, 42203bc02bceSGeert Uytterhoeven USB_SS_PORT_LS_U3); 42213bc02bceSGeert Uytterhoeven } else { 42223bc02bceSGeert Uytterhoeven ret = usb_clear_port_feature(hdev, port1, 42233bc02bceSGeert Uytterhoeven USB_PORT_FEAT_ENABLE); 42243bc02bceSGeert Uytterhoeven } 42253bc02bceSGeert Uytterhoeven } 42263bc02bceSGeert Uytterhoeven if (port_dev->child && set_state) 42273bc02bceSGeert Uytterhoeven usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); 42283bc02bceSGeert Uytterhoeven if (ret && ret != -ENODEV) 42293bc02bceSGeert Uytterhoeven dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); 42303bc02bceSGeert Uytterhoeven return ret; 42313bc02bceSGeert Uytterhoeven } 42323bc02bceSGeert Uytterhoeven 42338dd8d2c9SDaniel Drake /* 42348dd8d2c9SDaniel Drake * usb_port_disable - disable a usb device's upstream port 42358dd8d2c9SDaniel Drake * @udev: device to disable 42368dd8d2c9SDaniel Drake * Context: @udev locked, must be able to sleep. 42378dd8d2c9SDaniel Drake * 42388dd8d2c9SDaniel Drake * Disables a USB device that isn't in active use. 42398dd8d2c9SDaniel Drake */ 42408dd8d2c9SDaniel Drake int usb_port_disable(struct usb_device *udev) 42418dd8d2c9SDaniel Drake { 42428dd8d2c9SDaniel Drake struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 42438dd8d2c9SDaniel Drake 42448dd8d2c9SDaniel Drake return hub_port_disable(hub, udev->portnum, 0); 42458dd8d2c9SDaniel Drake } 42461da177e4SLinus Torvalds 42471da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 42481da177e4SLinus Torvalds * 42491da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 42501da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 42511da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 42521da177e4SLinus Torvalds * 42531da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 42541da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 42551da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 42561da177e4SLinus Torvalds * 42571da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 42581da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 42591da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 42601da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 42611da177e4SLinus Torvalds */ 4262ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 42631da177e4SLinus Torvalds { 42641da177e4SLinus Torvalds int ret; 42651da177e4SLinus Torvalds u16 portchange, portstatus; 42661da177e4SLinus Torvalds unsigned connection = 0xffff; 4267d99f6b41SDan Williams int total_time, stable_time = 0; 4268d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 42691da177e4SLinus Torvalds 42701da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 42711da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 42721da177e4SLinus Torvalds if (ret < 0) 42731da177e4SLinus Torvalds return ret; 42741da177e4SLinus Torvalds 42751da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 42761da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 4277ad493e5eSLan Tianyu if (!must_be_connected || 4278ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 42791da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 42801da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 42811da177e4SLinus Torvalds break; 42821da177e4SLinus Torvalds } else { 42831da177e4SLinus Torvalds stable_time = 0; 42841da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 42851da177e4SLinus Torvalds } 42861da177e4SLinus Torvalds 42871da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4288ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 42891da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 42901da177e4SLinus Torvalds } 42911da177e4SLinus Torvalds 42921da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 42931da177e4SLinus Torvalds break; 42941da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 42951da177e4SLinus Torvalds } 42961da177e4SLinus Torvalds 4297d99f6b41SDan Williams dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", 4298d99f6b41SDan Williams total_time, stable_time, portstatus); 42991da177e4SLinus Torvalds 43001da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 43011da177e4SLinus Torvalds return -ETIMEDOUT; 43021da177e4SLinus Torvalds return portstatus; 43031da177e4SLinus Torvalds } 43041da177e4SLinus Torvalds 4305fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 43061da177e4SLinus Torvalds { 4307ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 4308ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 43092caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 43101da177e4SLinus Torvalds } 4311fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 43121da177e4SLinus Torvalds 43131da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 43141da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 43151da177e4SLinus Torvalds 43164326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 43171da177e4SLinus Torvalds { 43181da177e4SLinus Torvalds int retval; 4319c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 43201da177e4SLinus Torvalds 4321c6515272SSarah Sharp /* 4322c6515272SSarah Sharp * The host controller will choose the device address, 4323c6515272SSarah Sharp * instead of the core having chosen it earlier 4324c6515272SSarah Sharp */ 4325c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 43261da177e4SLinus Torvalds return -EINVAL; 43271da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 43281da177e4SLinus Torvalds return 0; 43291da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 43301da177e4SLinus Torvalds return -EINVAL; 4331c8d4af8eSAndiry Xu if (hcd->driver->address_device) 4332c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 4333c8d4af8eSAndiry Xu else 43341da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 43354326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 43361da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 43371da177e4SLinus Torvalds if (retval == 0) { 43383b29b68bSAlan Stern update_devnum(udev, devnum); 43394953d141SDavid Vrabel /* Device now using proper address. */ 43401da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 4341fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 43421da177e4SLinus Torvalds } 43431da177e4SLinus Torvalds return retval; 43441da177e4SLinus Torvalds } 43451da177e4SLinus Torvalds 4346890dae88SMathias Nyman /* 4347890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 4348890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 4349890dae88SMathias Nyman * enabled. 4350890dae88SMathias Nyman * 4351890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 4352890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 4353890dae88SMathias Nyman * support bit in the BOS descriptor. 4354890dae88SMathias Nyman */ 4355890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 4356890dae88SMathias Nyman { 4357d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 4358d99f6b41SDan Williams int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; 4359890dae88SMathias Nyman 43607b2db29fSGuenter Roeck if (!udev->usb2_hw_lpm_capable || !udev->bos) 4361890dae88SMathias Nyman return; 4362890dae88SMathias Nyman 4363d99f6b41SDan Williams if (hub) 4364d99f6b41SDan Williams connect_type = hub->ports[udev->portnum - 1]->connect_type; 4365890dae88SMathias Nyman 436623c05820SBjørn Mork if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || 4367890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 4368890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 4369890dae88SMathias Nyman usb_set_usb2_hardware_lpm(udev, 1); 4370890dae88SMathias Nyman } 4371890dae88SMathias Nyman } 4372890dae88SMathias Nyman 437348fc7dbdSDan Williams static int hub_enable_device(struct usb_device *udev) 437448fc7dbdSDan Williams { 437548fc7dbdSDan Williams struct usb_hcd *hcd = bus_to_hcd(udev->bus); 437648fc7dbdSDan Williams 437748fc7dbdSDan Williams if (!hcd->driver->enable_device) 437848fc7dbdSDan Williams return 0; 437948fc7dbdSDan Williams if (udev->state == USB_STATE_ADDRESS) 438048fc7dbdSDan Williams return 0; 438148fc7dbdSDan Williams if (udev->state != USB_STATE_DEFAULT) 438248fc7dbdSDan Williams return -EINVAL; 438348fc7dbdSDan Williams 438448fc7dbdSDan Williams return hcd->driver->enable_device(hcd, udev); 438548fc7dbdSDan Williams } 438648fc7dbdSDan Williams 43871da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 43881da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 43891da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 43901da177e4SLinus Torvalds * 43911da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 43925c79a1e3SDan Williams * usb_reset_and_verify_device), the caller must own the device lock and 43935c79a1e3SDan Williams * the port lock. For a newly detected device that is not accessible 43945c79a1e3SDan Williams * through any global pointers, it's not necessary to lock the device, 43955c79a1e3SDan Williams * but it is still necessary to lock the port. 43961da177e4SLinus Torvalds */ 43971da177e4SLinus Torvalds static int 43981da177e4SLinus Torvalds hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, 43991da177e4SLinus Torvalds int retry_counter) 44001da177e4SLinus Torvalds { 44011da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4402e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 440325244227SNicolas Boichat struct usb_port *port_dev = hub->ports[port1 - 1]; 44040d5ce778SOliver Neukum int retries, operations, retval, i; 44051da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 44061da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4407e538dfdaSMichal Nazarewicz const char *speed; 44084326ed0bSAlan Stern int devnum = udev->devnum; 44091bb90cf0SPeter Chen const char *driver_name; 44101da177e4SLinus Torvalds 44111da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 44121da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 44131da177e4SLinus Torvalds */ 44141da177e4SLinus Torvalds if (!hdev->parent) { 44151da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 44161da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 44171da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 44181da177e4SLinus Torvalds } 44191da177e4SLinus Torvalds 44201da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 44211da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 44221da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 44231da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 44241da177e4SLinus Torvalds 4425feb26ac3SChris Bainbridge mutex_lock(hcd->address0_mutex); 44261da177e4SLinus Torvalds 44271da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4428e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 442975d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 44301da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 44311da177e4SLinus Torvalds goto fail; 44321da177e4SLinus Torvalds /* success, speed is known */ 443307194ab7SLuben Tuikov 44341da177e4SLinus Torvalds retval = -ENODEV; 44351da177e4SLinus Torvalds 44368a1b2725SMathias Nyman /* Don't allow speed changes at reset, except usb 3.0 to faster */ 44378a1b2725SMathias Nyman if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && 44388a1b2725SMathias Nyman !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { 44391da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 44401da177e4SLinus Torvalds goto fail; 44411da177e4SLinus Torvalds } 44421da177e4SLinus Torvalds oldspeed = udev->speed; 44431da177e4SLinus Torvalds 44441da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 44451da177e4SLinus Torvalds * it's fixed size except for full speed devices. 44465bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 44475bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 44481da177e4SLinus Torvalds */ 44491da177e4SLinus Torvalds switch (udev->speed) { 44508a1b2725SMathias Nyman case USB_SPEED_SUPER_PLUS: 44516b403b02SSarah Sharp case USB_SPEED_SUPER: 4452551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4453551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 44545bb6e0aeSInaky Perez-Gonzalez break; 44551da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4456551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 44571da177e4SLinus Torvalds break; 44581da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 44591da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 44601da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 44611da177e4SLinus Torvalds * then correct our initial guess. 44621da177e4SLinus Torvalds */ 4463551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 44641da177e4SLinus Torvalds break; 44651da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4466551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 44671da177e4SLinus Torvalds break; 44681da177e4SLinus Torvalds default: 44691da177e4SLinus Torvalds goto fail; 44701da177e4SLinus Torvalds } 44711da177e4SLinus Torvalds 4472e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4473e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4474e538dfdaSMichal Nazarewicz else 4475e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4476e538dfdaSMichal Nazarewicz 44771bb90cf0SPeter Chen /* 44781bb90cf0SPeter Chen * The controller driver may be NULL if the controller device 44791bb90cf0SPeter Chen * is the middle device between platform device and roothub. 44801bb90cf0SPeter Chen * This middle device may not need a device driver due to 44811bb90cf0SPeter Chen * all hardware control can be at platform device driver, this 44821bb90cf0SPeter Chen * platform device is usually a dual-role USB controller device. 44831bb90cf0SPeter Chen */ 44841bb90cf0SPeter Chen if (udev->bus->controller->driver) 44851bb90cf0SPeter Chen driver_name = udev->bus->controller->driver->name; 44861bb90cf0SPeter Chen else 44871bb90cf0SPeter Chen driver_name = udev->bus->sysdev->driver->name; 44881bb90cf0SPeter Chen 44898a1b2725SMathias Nyman if (udev->speed < USB_SPEED_SUPER) 449083a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4491e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4492e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 44931bb90cf0SPeter Chen devnum, driver_name); 44941da177e4SLinus Torvalds 44951da177e4SLinus Torvalds /* Set up TT records, if needed */ 44961da177e4SLinus Torvalds if (hdev->tt) { 44971da177e4SLinus Torvalds udev->tt = hdev->tt; 44981da177e4SLinus Torvalds udev->ttport = hdev->ttport; 44991da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 45001da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4501d199c96dSAlan Stern if (!hub->tt.hub) { 4502d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4503d199c96dSAlan Stern retval = -EINVAL; 4504d199c96dSAlan Stern goto fail; 4505d199c96dSAlan Stern } 45061da177e4SLinus Torvalds udev->tt = &hub->tt; 45071da177e4SLinus Torvalds udev->ttport = port1; 45081da177e4SLinus Torvalds } 45091da177e4SLinus Torvalds 45101da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 45111da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 45121da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 45131da177e4SLinus Torvalds * Change it cautiously. 45141da177e4SLinus Torvalds * 451548fc7dbdSDan Williams * NOTE: If use_new_scheme() is true we will start by issuing 45161da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 45171da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 45181da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 45191da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 45201da177e4SLinus Torvalds * value. 45211da177e4SLinus Torvalds */ 45220d5ce778SOliver Neukum for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { 452348fc7dbdSDan Williams bool did_new_scheme = false; 452448fc7dbdSDan Williams 452525244227SNicolas Boichat if (use_new_scheme(udev, retry_counter, port_dev)) { 45261da177e4SLinus Torvalds struct usb_device_descriptor *buf; 45271da177e4SLinus Torvalds int r = 0; 45281da177e4SLinus Torvalds 452948fc7dbdSDan Williams did_new_scheme = true; 453048fc7dbdSDan Williams retval = hub_enable_device(udev); 4531938569ebSOliver Neukum if (retval < 0) { 4532938569ebSOliver Neukum dev_err(&udev->dev, 4533938569ebSOliver Neukum "hub failed to enable device, error %d\n", 4534938569ebSOliver Neukum retval); 453548fc7dbdSDan Williams goto fail; 4536938569ebSOliver Neukum } 453748fc7dbdSDan Williams 45381da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 45391da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 45401da177e4SLinus Torvalds if (!buf) { 45411da177e4SLinus Torvalds retval = -ENOMEM; 45421da177e4SLinus Torvalds continue; 45431da177e4SLinus Torvalds } 45441da177e4SLinus Torvalds 4545b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4546b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4547b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 45481da177e4SLinus Torvalds */ 45490d5ce778SOliver Neukum for (operations = 0; operations < 3; ++operations) { 45501da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 45511da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 45521da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 45531da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 45541da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4555fd7c519dSJaroslav Kysela initial_descriptor_timeout); 45561da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 45575bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 45581da177e4SLinus Torvalds if (buf->bDescriptorType == 45591da177e4SLinus Torvalds USB_DT_DEVICE) { 45601da177e4SLinus Torvalds r = 0; 45611da177e4SLinus Torvalds break; 45621da177e4SLinus Torvalds } 45631da177e4SLinus Torvalds /* FALL THROUGH */ 45641da177e4SLinus Torvalds default: 45651da177e4SLinus Torvalds if (r == 0) 45661da177e4SLinus Torvalds r = -EPROTO; 45671da177e4SLinus Torvalds break; 45681da177e4SLinus Torvalds } 4569264904ccSOliver Neukum /* 4570264904ccSOliver Neukum * Some devices time out if they are powered on 4571264904ccSOliver Neukum * when already connected. They need a second 4572264904ccSOliver Neukum * reset. But only on the first attempt, 4573264904ccSOliver Neukum * lest we get into a time out/reset loop 4574264904ccSOliver Neukum */ 45756e01827eSMaxim Moseychuk if (r == 0 || (r == -ETIMEDOUT && 45766e01827eSMaxim Moseychuk retries == 0 && 45776e01827eSMaxim Moseychuk udev->speed > USB_SPEED_FULL)) 45781da177e4SLinus Torvalds break; 45791da177e4SLinus Torvalds } 45801da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 45811da177e4SLinus Torvalds buf->bMaxPacketSize0; 45821da177e4SLinus Torvalds kfree(buf); 45831da177e4SLinus Torvalds 458475d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 45851da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 45861da177e4SLinus Torvalds goto fail; 45871da177e4SLinus Torvalds if (oldspeed != udev->speed) { 45881da177e4SLinus Torvalds dev_dbg(&udev->dev, 45891da177e4SLinus Torvalds "device reset changed speed!\n"); 45901da177e4SLinus Torvalds retval = -ENODEV; 45911da177e4SLinus Torvalds goto fail; 45921da177e4SLinus Torvalds } 45931da177e4SLinus Torvalds if (r) { 4594e9e88fb7SAlan Stern if (r != -ENODEV) 4595e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4596b9cef6c3SWu Fengguang r); 45971da177e4SLinus Torvalds retval = -EMSGSIZE; 45981da177e4SLinus Torvalds continue; 45991da177e4SLinus Torvalds } 46001da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 46011da177e4SLinus Torvalds } 46021da177e4SLinus Torvalds 46036c529cdcSInaky Perez-Gonzalez /* 46046c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 46056c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 46066c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 46076c529cdcSInaky Perez-Gonzalez */ 46086c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 46090d5ce778SOliver Neukum for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { 46104326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 46111da177e4SLinus Torvalds if (retval >= 0) 46121da177e4SLinus Torvalds break; 46131da177e4SLinus Torvalds msleep(200); 46141da177e4SLinus Torvalds } 46151da177e4SLinus Torvalds if (retval < 0) { 4616e9e88fb7SAlan Stern if (retval != -ENODEV) 4617e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 46184326ed0bSAlan Stern devnum, retval); 46191da177e4SLinus Torvalds goto fail; 46201da177e4SLinus Torvalds } 46218a1b2725SMathias Nyman if (udev->speed >= USB_SPEED_SUPER) { 4622c6515272SSarah Sharp devnum = udev->devnum; 4623c6515272SSarah Sharp dev_info(&udev->dev, 462445455e4dSMathias Nyman "%s SuperSpeed%s%s USB device number %d using %s\n", 4625c6515272SSarah Sharp (udev->config) ? "reset" : "new", 462645455e4dSMathias Nyman (udev->speed == USB_SPEED_SUPER_PLUS) ? 462745455e4dSMathias Nyman "Plus Gen 2" : " Gen 1", 462845455e4dSMathias Nyman (udev->rx_lanes == 2 && udev->tx_lanes == 2) ? 462945455e4dSMathias Nyman "x2" : "", 46301bb90cf0SPeter Chen devnum, driver_name); 4631c6515272SSarah Sharp } 46321da177e4SLinus Torvalds 46331da177e4SLinus Torvalds /* cope with hardware quirkiness: 46341da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 46351da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 46361da177e4SLinus Torvalds */ 46371da177e4SLinus Torvalds msleep(10); 463848fc7dbdSDan Williams /* use_new_scheme() checks the speed which may have 463948fc7dbdSDan Williams * changed since the initial look so we cache the result 464048fc7dbdSDan Williams * in did_new_scheme 464148fc7dbdSDan Williams */ 464248fc7dbdSDan Williams if (did_new_scheme) 46431da177e4SLinus Torvalds break; 46446c529cdcSInaky Perez-Gonzalez } 46451da177e4SLinus Torvalds 46461da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 46471da177e4SLinus Torvalds if (retval < 8) { 4648e9e88fb7SAlan Stern if (retval != -ENODEV) 4649b9cef6c3SWu Fengguang dev_err(&udev->dev, 4650b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4651b9cef6c3SWu Fengguang retval); 46521da177e4SLinus Torvalds if (retval >= 0) 46531da177e4SLinus Torvalds retval = -EMSGSIZE; 46541da177e4SLinus Torvalds } else { 4655886ee36eSFelipe Balbi u32 delay; 4656886ee36eSFelipe Balbi 46571da177e4SLinus Torvalds retval = 0; 4658886ee36eSFelipe Balbi 4659886ee36eSFelipe Balbi delay = udev->parent->hub_delay; 4660886ee36eSFelipe Balbi udev->hub_delay = min_t(u32, delay, 4661886ee36eSFelipe Balbi USB_TP_TRANSMISSION_DELAY_MAX); 4662886ee36eSFelipe Balbi retval = usb_set_isoch_delay(udev); 4663886ee36eSFelipe Balbi if (retval) { 4664886ee36eSFelipe Balbi dev_dbg(&udev->dev, 4665886ee36eSFelipe Balbi "Failed set isoch delay, error %d\n", 4666886ee36eSFelipe Balbi retval); 4667886ee36eSFelipe Balbi retval = 0; 4668886ee36eSFelipe Balbi } 46691da177e4SLinus Torvalds break; 46701da177e4SLinus Torvalds } 46711da177e4SLinus Torvalds } 46721da177e4SLinus Torvalds if (retval) 46731da177e4SLinus Torvalds goto fail; 46741da177e4SLinus Torvalds 4675d8aec3dbSElric Fu /* 4676d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4677d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4678d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4679d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4680d8aec3dbSElric Fu */ 46818a1b2725SMathias Nyman if ((udev->speed >= USB_SPEED_SUPER) && 4682d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4683d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4684d8aec3dbSElric Fu "warm reset device\n"); 4685d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4686d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4687d8aec3dbSElric Fu retval = -EINVAL; 4688d8aec3dbSElric Fu goto fail; 4689d8aec3dbSElric Fu } 4690d8aec3dbSElric Fu 46916b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 46928a1b2725SMathias Nyman udev->speed >= USB_SPEED_SUPER) 46936b403b02SSarah Sharp i = 512; 46946b403b02SSarah Sharp else 46956b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 469629cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 469756626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 46981da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 469956626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 47001da177e4SLinus Torvalds retval = -EMSGSIZE; 47011da177e4SLinus Torvalds goto fail; 47021da177e4SLinus Torvalds } 470356626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 47041da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 470556626a72SAlan Stern else 470656626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 47071da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4708fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 47091da177e4SLinus Torvalds } 47101da177e4SLinus Torvalds 47111da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 47121da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4713e9e88fb7SAlan Stern if (retval != -ENODEV) 4714b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4715b9cef6c3SWu Fengguang retval); 47161da177e4SLinus Torvalds if (retval >= 0) 47171da177e4SLinus Torvalds retval = -ENOMSG; 47181da177e4SLinus Torvalds goto fail; 47191da177e4SLinus Torvalds } 47201da177e4SLinus Torvalds 4721ad87e032SAlan Stern usb_detect_quirks(udev); 4722ad87e032SAlan Stern 47231ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 47241ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 472551e0a012SSarah Sharp if (!retval) { 4726d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 472751e0a012SSarah Sharp usb_set_lpm_parameters(udev); 472851e0a012SSarah Sharp } 47291ff4df56SAndiry Xu } 47303148bf04SAndiry Xu 47311da177e4SLinus Torvalds retval = 0; 473248f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 473348f24970SAlek Du if (hcd->driver->update_device) 473448f24970SAlek Du hcd->driver->update_device(hcd, udev); 4735890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 47361da177e4SLinus Torvalds fail: 47374326ed0bSAlan Stern if (retval) { 47381da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 47393b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 47404326ed0bSAlan Stern } 4741feb26ac3SChris Bainbridge mutex_unlock(hcd->address0_mutex); 47421da177e4SLinus Torvalds return retval; 47431da177e4SLinus Torvalds } 47441da177e4SLinus Torvalds 47451da177e4SLinus Torvalds static void 47461da177e4SLinus Torvalds check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) 47471da177e4SLinus Torvalds { 47481da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 47491da177e4SLinus Torvalds int status; 47501da177e4SLinus Torvalds 47512a159389SJohan Hovold if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) 47522a159389SJohan Hovold return; 47532a159389SJohan Hovold 4754e94b1766SChristoph Lameter qual = kmalloc(sizeof *qual, GFP_KERNEL); 47551da177e4SLinus Torvalds if (qual == NULL) 47561da177e4SLinus Torvalds return; 47571da177e4SLinus Torvalds 47581da177e4SLinus Torvalds status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, 47591da177e4SLinus Torvalds qual, sizeof *qual); 47601da177e4SLinus Torvalds if (status == sizeof *qual) { 47611da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 47621da177e4SLinus Torvalds "connect to a high speed hub\n"); 47631da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 47641da177e4SLinus Torvalds if (hub->has_indicators) { 47651da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 476622f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 476722f6a0f0SShaibal Dutta &hub->leds, 0); 47681da177e4SLinus Torvalds } 47691da177e4SLinus Torvalds } 47701da177e4SLinus Torvalds kfree(qual); 47711da177e4SLinus Torvalds } 47721da177e4SLinus Torvalds 47731da177e4SLinus Torvalds static unsigned 47741da177e4SLinus Torvalds hub_power_remaining(struct usb_hub *hub) 47751da177e4SLinus Torvalds { 47761da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 47771da177e4SLinus Torvalds int remaining; 477855c52718SAlan Stern int port1; 47791da177e4SLinus Torvalds 478055c52718SAlan Stern if (!hub->limited_power) 47811da177e4SLinus Torvalds return 0; 47821da177e4SLinus Torvalds 478355c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 478455c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4785d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4786d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 4787430ee58eSSebastian Andrzej Siewior unsigned unit_load; 4788d99f6b41SDan Williams int delta; 47891da177e4SLinus Torvalds 47901da177e4SLinus Torvalds if (!udev) 47911da177e4SLinus Torvalds continue; 4792430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4793430ee58eSSebastian Andrzej Siewior unit_load = 150; 4794430ee58eSSebastian Andrzej Siewior else 4795430ee58eSSebastian Andrzej Siewior unit_load = 100; 47961da177e4SLinus Torvalds 4797430ee58eSSebastian Andrzej Siewior /* 4798430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4799430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4800430ee58eSSebastian Andrzej Siewior */ 48011da177e4SLinus Torvalds if (udev->actconfig) 48028d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 480355c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4804430ee58eSSebastian Andrzej Siewior delta = unit_load; 48051da177e4SLinus Torvalds else 480655c52718SAlan Stern delta = 8; 480755c52718SAlan Stern if (delta > hub->mA_per_port) 4808d99f6b41SDan Williams dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", 4809d99f6b41SDan Williams delta, hub->mA_per_port); 48101da177e4SLinus Torvalds remaining -= delta; 48111da177e4SLinus Torvalds } 48121da177e4SLinus Torvalds if (remaining < 0) { 481355c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 481455c52718SAlan Stern -remaining); 48151da177e4SLinus Torvalds remaining = 0; 48161da177e4SLinus Torvalds } 48171da177e4SLinus Torvalds return remaining; 48181da177e4SLinus Torvalds } 48191da177e4SLinus Torvalds 4820af376a46SDan Williams static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, 4821af376a46SDan Williams u16 portchange) 48221da177e4SLinus Torvalds { 482394c43b98SAlan Stern int status = -ENODEV; 482494c43b98SAlan Stern int i; 4825430ee58eSSebastian Andrzej Siewior unsigned unit_load; 48261da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 48271da177e4SLinus Torvalds struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 4828d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4829af376a46SDan Williams struct usb_device *udev = port_dev->child; 48305ee0f803SOliver Neukum static int unreliable_port = -1; 48318808f00cSAlan Stern 483224618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4833b76baa81SPeter Chen if (udev) { 4834b2108f1eSPeter Chen if (hcd->usb_phy && !hdev->parent) 48353d46e73dSAntoine Tenart usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); 4836d99f6b41SDan Williams usb_disconnect(&port_dev->child); 4837b76baa81SPeter Chen } 483824618b0cSAlan Stern 4839253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4840253e0572SAlan Stern * disconnect or the connect status changes. 4841253e0572SAlan Stern */ 4842253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4843253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4844253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4845253e0572SAlan Stern 48465257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 48475257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4848ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 48495257d97aSAlan Stern if (status < 0) { 48505ee0f803SOliver Neukum if (status != -ENODEV && 48515ee0f803SOliver Neukum port1 != unreliable_port && 48525ee0f803SOliver Neukum printk_ratelimit()) 4853dd5f5006STakashi Iwai dev_err(&port_dev->dev, "connect-debounce failed\n"); 48545257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 48555ee0f803SOliver Neukum unreliable_port = port1; 48565257d97aSAlan Stern } else { 48575257d97aSAlan Stern portstatus = status; 48585257d97aSAlan Stern } 48595257d97aSAlan Stern } 48605257d97aSAlan Stern 4861253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4862253e0572SAlan Stern * the device was "removed". 4863253e0572SAlan Stern */ 4864253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4865253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 48661da177e4SLinus Torvalds 4867fbaecff0SDeepak Das /* 4868fbaecff0SDeepak Das * maybe switch power back on (e.g. root hub was reset) 4869fbaecff0SDeepak Das * but only if the port isn't owned by someone else. 4870fbaecff0SDeepak Das */ 48719262c19dSDan Williams if (hub_is_port_power_switchable(hub) 4872fbaecff0SDeepak Das && !port_is_power_on(hub, portstatus) 4873fbaecff0SDeepak Das && !port_dev->port_owner) 48741da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 48751da177e4SLinus Torvalds 48761da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 48771da177e4SLinus Torvalds goto done; 48781da177e4SLinus Torvalds return; 48791da177e4SLinus Torvalds } 4880430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4881430ee58eSSebastian Andrzej Siewior unit_load = 150; 4882430ee58eSSebastian Andrzej Siewior else 4883430ee58eSSebastian Andrzej Siewior unit_load = 100; 48841da177e4SLinus Torvalds 4885e9e88fb7SAlan Stern status = 0; 48861da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 48871da177e4SLinus Torvalds 48881da177e4SLinus Torvalds /* reallocate for each attempt, since references 48891da177e4SLinus Torvalds * to the previous one can escape in various ways 48901da177e4SLinus Torvalds */ 48911da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 48921da177e4SLinus Torvalds if (!udev) { 4893d99f6b41SDan Williams dev_err(&port_dev->dev, 4894d99f6b41SDan Williams "couldn't allocate usb_device\n"); 48951da177e4SLinus Torvalds goto done; 48961da177e4SLinus Torvalds } 48971da177e4SLinus Torvalds 48981da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 489955c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4900b6956ffaSAlan Stern udev->level = hdev->level + 1; 49018af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 49021da177e4SLinus Torvalds 49038a1b2725SMathias Nyman /* Devices connected to SuperSpeed hubs are USB 3.0 or later */ 4904131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4905e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4906e7b77172SSarah Sharp else 4907e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4908e7b77172SSarah Sharp 49093b29b68bSAlan Stern choose_devnum(udev); 4910c6515272SSarah Sharp if (udev->devnum <= 0) { 4911c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4912c6515272SSarah Sharp goto loop; 4913c6515272SSarah Sharp } 4914c6515272SSarah Sharp 4915e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 49165c79a1e3SDan Williams usb_lock_port(port_dev); 49171da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 49185c79a1e3SDan Williams usb_unlock_port(port_dev); 49191da177e4SLinus Torvalds if (status < 0) 49201da177e4SLinus Torvalds goto loop; 49211da177e4SLinus Torvalds 492293362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 4923b2a542bbSDmitry Fleytman msleep(2000); 492493362a87SPhil Dibowitz 49251da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 49261da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 49271da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 49281da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 49291da177e4SLinus Torvalds * on the parent. 49301da177e4SLinus Torvalds */ 49311da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4932430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 49331da177e4SLinus Torvalds u16 devstat; 49341da177e4SLinus Torvalds 4935d9e1e148SFelipe Balbi status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, 49361da177e4SLinus Torvalds &devstat); 493715b7336eSAlan Stern if (status) { 49381da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 49391da177e4SLinus Torvalds goto loop_disable; 49401da177e4SLinus Torvalds } 49411da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 49421da177e4SLinus Torvalds dev_err(&udev->dev, 49431da177e4SLinus Torvalds "can't connect bus-powered hub " 49441da177e4SLinus Torvalds "to this port\n"); 49451da177e4SLinus Torvalds if (hub->has_indicators) { 49461da177e4SLinus Torvalds hub->indicator[port1-1] = 49471da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 494822f6a0f0SShaibal Dutta queue_delayed_work( 494922f6a0f0SShaibal Dutta system_power_efficient_wq, 495022f6a0f0SShaibal Dutta &hub->leds, 0); 49511da177e4SLinus Torvalds } 49521da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 49531da177e4SLinus Torvalds goto loop_disable; 49541da177e4SLinus Torvalds } 49551da177e4SLinus Torvalds } 49561da177e4SLinus Torvalds 49571da177e4SLinus Torvalds /* check for devices running slower than they could */ 49581da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 49591da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 49601da177e4SLinus Torvalds && highspeed_hubs != 0) 49611da177e4SLinus Torvalds check_highspeed(hub, udev, port1); 49621da177e4SLinus Torvalds 4963fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 49641da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 49651da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 49661da177e4SLinus Torvalds */ 49671da177e4SLinus Torvalds status = 0; 49681da177e4SLinus Torvalds 4969d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 4970d8521afeSDan Williams 49711da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 49721da177e4SLinus Torvalds * been disconnected; we would race with the 49731da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 49741da177e4SLinus Torvalds */ 49751da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 49761da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 49771da177e4SLinus Torvalds status = -ENOTCONN; 49781da177e4SLinus Torvalds else 4979d99f6b41SDan Williams port_dev->child = udev; 49801da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4981d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 49821da177e4SLinus Torvalds 49831da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 49841da177e4SLinus Torvalds if (!status) { 49851da177e4SLinus Torvalds status = usb_new_device(udev); 49861da177e4SLinus Torvalds if (status) { 4987d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 49881da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4989d99f6b41SDan Williams port_dev->child = NULL; 49901da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4991d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 499201ed67dcSTony Zheng } else { 499301ed67dcSTony Zheng if (hcd->usb_phy && !hdev->parent) 499401ed67dcSTony Zheng usb_phy_notify_connect(hcd->usb_phy, 499501ed67dcSTony Zheng udev->speed); 49961da177e4SLinus Torvalds } 49971da177e4SLinus Torvalds } 49981da177e4SLinus Torvalds 49991da177e4SLinus Torvalds if (status) 50001da177e4SLinus Torvalds goto loop_disable; 50011da177e4SLinus Torvalds 50021da177e4SLinus Torvalds status = hub_power_remaining(hub); 50031da177e4SLinus Torvalds if (status) 5004d99f6b41SDan Williams dev_dbg(hub->intfdev, "%dmA power budget left\n", status); 50051da177e4SLinus Torvalds 50061da177e4SLinus Torvalds return; 50071da177e4SLinus Torvalds 50081da177e4SLinus Torvalds loop_disable: 50091da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 50101da177e4SLinus Torvalds loop: 5011fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 50123b29b68bSAlan Stern release_devnum(udev); 5013f7410cedSHerbert Xu hub_free_dev(udev); 50141da177e4SLinus Torvalds usb_put_dev(udev); 5015ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 50161da177e4SLinus Torvalds break; 5017973593a9SMike Looijmans 5018973593a9SMike Looijmans /* When halfway through our retry count, power-cycle the port */ 5019973593a9SMike Looijmans if (i == (SET_CONFIG_TRIES / 2) - 1) { 5020973593a9SMike Looijmans dev_info(&port_dev->dev, "attempt power cycle\n"); 5021973593a9SMike Looijmans usb_hub_set_port_power(hdev, hub, port1, false); 5022973593a9SMike Looijmans msleep(2 * hub_power_on_good_delay(hub)); 5023973593a9SMike Looijmans usb_hub_set_port_power(hdev, hub, port1, true); 5024973593a9SMike Looijmans msleep(hub_power_on_good_delay(hub)); 5025973593a9SMike Looijmans } 50261da177e4SLinus Torvalds } 50273a31155cSAlan Stern if (hub->hdev->parent || 50283a31155cSAlan Stern !hcd->driver->port_handed_over || 5029e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 5030e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 5031d99f6b41SDan Williams dev_err(&port_dev->dev, 5032d99f6b41SDan Williams "unable to enumerate USB device\n"); 5033e9e88fb7SAlan Stern } 50341da177e4SLinus Torvalds 50351da177e4SLinus Torvalds done: 50361da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 503794c43b98SAlan Stern if (hcd->driver->relinquish_port && !hub->hdev->parent) { 503894c43b98SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 503990da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 504094c43b98SAlan Stern } 50411da177e4SLinus Torvalds } 50421da177e4SLinus Torvalds 5043af376a46SDan Williams /* Handle physical or logical connection change events. 5044af376a46SDan Williams * This routine is called when: 5045af376a46SDan Williams * a port connection-change occurs; 5046af376a46SDan Williams * a port enable-change occurs (often caused by EMI); 5047af376a46SDan Williams * usb_reset_and_verify_device() encounters changed descriptors (as from 5048af376a46SDan Williams * a firmware download) 5049af376a46SDan Williams * caller already locked the hub 5050af376a46SDan Williams */ 5051af376a46SDan Williams static void hub_port_connect_change(struct usb_hub *hub, int port1, 505272937e1eSSarah Sharp u16 portstatus, u16 portchange) 50535c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 5054714b07beSSarah Sharp { 5055af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 5056af376a46SDan Williams struct usb_device *udev = port_dev->child; 5057af376a46SDan Williams int status = -ENODEV; 5058714b07beSSarah Sharp 5059af376a46SDan Williams dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, 5060af376a46SDan Williams portchange, portspeed(hub, portstatus)); 5061af376a46SDan Williams 5062af376a46SDan Williams if (hub->has_indicators) { 5063af376a46SDan Williams set_port_led(hub, port1, HUB_LED_AUTO); 5064af376a46SDan Williams hub->indicator[port1-1] = INDICATOR_AUTO; 50654ee823b8SSarah Sharp } 5066714b07beSSarah Sharp 5067af376a46SDan Williams #ifdef CONFIG_USB_OTG 5068af376a46SDan Williams /* during HNP, don't repeat the debounce */ 5069af376a46SDan Williams if (hub->hdev->bus->is_b_host) 5070af376a46SDan Williams portchange &= ~(USB_PORT_STAT_C_CONNECTION | 5071af376a46SDan Williams USB_PORT_STAT_C_ENABLE); 5072af376a46SDan Williams #endif 5073714b07beSSarah Sharp 5074af376a46SDan Williams /* Try to resuscitate an existing device */ 5075af376a46SDan Williams if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 5076af376a46SDan Williams udev->state != USB_STATE_NOTATTACHED) { 5077af376a46SDan Williams if (portstatus & USB_PORT_STAT_ENABLE) { 5078af376a46SDan Williams status = 0; /* Nothing to do */ 5079ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 5080af376a46SDan Williams } else if (udev->state == USB_STATE_SUSPENDED && 5081af376a46SDan Williams udev->persist_enabled) { 5082af376a46SDan Williams /* For a suspended device, treat this as a 5083af376a46SDan Williams * remote wakeup event. 5084af376a46SDan Williams */ 50855c79a1e3SDan Williams usb_unlock_port(port_dev); 5086af376a46SDan Williams status = usb_remote_wakeup(udev); 50875c79a1e3SDan Williams usb_lock_port(port_dev); 5088af376a46SDan Williams #endif 5089af376a46SDan Williams } else { 5090af376a46SDan Williams /* Don't resuscitate */; 5091af376a46SDan Williams } 5092af376a46SDan Williams } 5093af376a46SDan Williams clear_bit(port1, hub->change_bits); 5094af376a46SDan Williams 50955c79a1e3SDan Williams /* successfully revalidated the connection */ 5096af376a46SDan Williams if (status == 0) 5097af376a46SDan Williams return; 5098af376a46SDan Williams 50995c79a1e3SDan Williams usb_unlock_port(port_dev); 5100af376a46SDan Williams hub_port_connect(hub, port1, portstatus, portchange); 51015c79a1e3SDan Williams usb_lock_port(port_dev); 51021da177e4SLinus Torvalds } 51031da177e4SLinus Torvalds 5104af376a46SDan Williams static void port_event(struct usb_hub *hub, int port1) 51055c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 5106af376a46SDan Williams { 51077671bd1eSZhuang Jin Can int connect_change; 5108af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 5109af376a46SDan Williams struct usb_device *udev = port_dev->child; 5110af376a46SDan Williams struct usb_device *hdev = hub->hdev; 5111af376a46SDan Williams u16 portstatus, portchange; 5112af376a46SDan Williams 5113af376a46SDan Williams connect_change = test_bit(port1, hub->change_bits); 5114af376a46SDan Williams clear_bit(port1, hub->event_bits); 5115af376a46SDan Williams clear_bit(port1, hub->wakeup_bits); 5116af376a46SDan Williams 5117af376a46SDan Williams if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) 5118af376a46SDan Williams return; 5119af376a46SDan Williams 5120af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONNECTION) { 5121af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); 5122714b07beSSarah Sharp connect_change = 1; 5123714b07beSSarah Sharp } 5124af376a46SDan Williams 5125af376a46SDan Williams if (portchange & USB_PORT_STAT_C_ENABLE) { 5126af376a46SDan Williams if (!connect_change) 5127af376a46SDan Williams dev_dbg(&port_dev->dev, "enable change, status %08x\n", 5128af376a46SDan Williams portstatus); 5129af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); 5130af376a46SDan Williams 5131af376a46SDan Williams /* 5132af376a46SDan Williams * EM interference sometimes causes badly shielded USB devices 5133af376a46SDan Williams * to be shutdown by the hub, this hack enables them again. 5134af376a46SDan Williams * Works at least with mouse driver. 5135af376a46SDan Williams */ 5136af376a46SDan Williams if (!(portstatus & USB_PORT_STAT_ENABLE) 5137af376a46SDan Williams && !connect_change && udev) { 5138af376a46SDan Williams dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); 5139af376a46SDan Williams connect_change = 1; 5140714b07beSSarah Sharp } 5141af376a46SDan Williams } 5142af376a46SDan Williams 5143af376a46SDan Williams if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 5144af376a46SDan Williams u16 status = 0, unused; 51451cbd53c8SRichard Leitner port_dev->over_current_count++; 5146af376a46SDan Williams 51471cbd53c8SRichard Leitner dev_dbg(&port_dev->dev, "over-current change #%u\n", 51481cbd53c8SRichard Leitner port_dev->over_current_count); 5149af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5150af376a46SDan Williams USB_PORT_FEAT_C_OVER_CURRENT); 5151af376a46SDan Williams msleep(100); /* Cool down */ 5152af376a46SDan Williams hub_power_on(hub, true); 5153af376a46SDan Williams hub_port_status(hub, port1, &status, &unused); 5154af376a46SDan Williams if (status & USB_PORT_STAT_OVERCURRENT) 5155af376a46SDan Williams dev_err(&port_dev->dev, "over-current condition\n"); 5156af376a46SDan Williams } 5157af376a46SDan Williams 5158af376a46SDan Williams if (portchange & USB_PORT_STAT_C_RESET) { 5159af376a46SDan Williams dev_dbg(&port_dev->dev, "reset change\n"); 5160af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); 5161af376a46SDan Williams } 5162af376a46SDan Williams if ((portchange & USB_PORT_STAT_C_BH_RESET) 5163af376a46SDan Williams && hub_is_superspeed(hdev)) { 5164af376a46SDan Williams dev_dbg(&port_dev->dev, "warm reset change\n"); 5165af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5166af376a46SDan Williams USB_PORT_FEAT_C_BH_PORT_RESET); 5167af376a46SDan Williams } 5168af376a46SDan Williams if (portchange & USB_PORT_STAT_C_LINK_STATE) { 5169af376a46SDan Williams dev_dbg(&port_dev->dev, "link state change\n"); 5170af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5171af376a46SDan Williams USB_PORT_FEAT_C_PORT_LINK_STATE); 5172af376a46SDan Williams } 5173af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 5174af376a46SDan Williams dev_warn(&port_dev->dev, "config error\n"); 5175af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5176af376a46SDan Williams USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 5177af376a46SDan Williams } 5178af376a46SDan Williams 5179097a155fSDan Williams /* skip port actions that require the port to be powered on */ 5180097a155fSDan Williams if (!pm_runtime_active(&port_dev->dev)) 5181097a155fSDan Williams return; 5182097a155fSDan Williams 5183af376a46SDan Williams if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) 5184af376a46SDan Williams connect_change = 1; 5185af376a46SDan Williams 5186af376a46SDan Williams /* 5187af376a46SDan Williams * Warm reset a USB3 protocol port if it's in 5188af376a46SDan Williams * SS.Inactive state. 5189af376a46SDan Williams */ 51903cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) { 5191af376a46SDan Williams dev_dbg(&port_dev->dev, "do warm reset\n"); 5192af376a46SDan Williams if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) 5193af376a46SDan Williams || udev->state == USB_STATE_NOTATTACHED) { 5194af376a46SDan Williams if (hub_port_reset(hub, port1, NULL, 5195af376a46SDan Williams HUB_BH_RESET_TIME, true) < 0) 5196af376a46SDan Williams hub_port_disable(hub, port1, 1); 51977671bd1eSZhuang Jin Can } else { 51985c79a1e3SDan Williams usb_unlock_port(port_dev); 5199af376a46SDan Williams usb_lock_device(udev); 5200af376a46SDan Williams usb_reset_device(udev); 5201af376a46SDan Williams usb_unlock_device(udev); 52025c79a1e3SDan Williams usb_lock_port(port_dev); 5203af376a46SDan Williams connect_change = 0; 5204af376a46SDan Williams } 52057671bd1eSZhuang Jin Can } 5206af376a46SDan Williams 5207af376a46SDan Williams if (connect_change) 5208af376a46SDan Williams hub_port_connect_change(hub, port1, portstatus, portchange); 5209af376a46SDan Williams } 5210af376a46SDan Williams 521132a69589SPetr Mladek static void hub_event(struct work_struct *work) 52121da177e4SLinus Torvalds { 52131da177e4SLinus Torvalds struct usb_device *hdev; 52141da177e4SLinus Torvalds struct usb_interface *intf; 52151da177e4SLinus Torvalds struct usb_hub *hub; 52161da177e4SLinus Torvalds struct device *hub_dev; 52171da177e4SLinus Torvalds u16 hubstatus; 52181da177e4SLinus Torvalds u16 hubchange; 52191da177e4SLinus Torvalds int i, ret; 52201da177e4SLinus Torvalds 522132a69589SPetr Mladek hub = container_of(work, struct usb_hub, events); 52225d14f323SPetr Mladek hdev = hub->hdev; 5223e8054854SAlan Stern hub_dev = hub->intfdev; 5224e8054854SAlan Stern intf = to_usb_interface(hub_dev); 522532a69589SPetr Mladek 522640f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 52273bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 52281da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 52291da177e4SLinus Torvalds (u16) hub->change_bits[0], 523040f122f3SAlan Stern (u16) hub->event_bits[0]); 52311da177e4SLinus Torvalds 52321da177e4SLinus Torvalds /* Lock the device, then check to see if we were 52331da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 523406b84e8aSAlan Stern usb_lock_device(hdev); 5235e8054854SAlan Stern if (unlikely(hub->disconnected)) 523632a69589SPetr Mladek goto out_hdev_lock; 52371da177e4SLinus Torvalds 52381da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 52391da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 52407de18d8bSAlan Stern hub->error = -ENODEV; 52414330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 524232a69589SPetr Mladek goto out_hdev_lock; 52431da177e4SLinus Torvalds } 52441da177e4SLinus Torvalds 524540f122f3SAlan Stern /* Autoresume */ 524640f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 524740f122f3SAlan Stern if (ret) { 524840f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 524932a69589SPetr Mladek goto out_hdev_lock; 525040f122f3SAlan Stern } 525140f122f3SAlan Stern 525240f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 525340f122f3SAlan Stern if (hub->quiescing) 5254eb6e2924SPetr Mladek goto out_autopm; 52551da177e4SLinus Torvalds 52561da177e4SLinus Torvalds if (hub->error) { 5257eb6e2924SPetr Mladek dev_dbg(hub_dev, "resetting for error %d\n", hub->error); 52581da177e4SLinus Torvalds 5259742120c6SMing Lei ret = usb_reset_device(hdev); 52601da177e4SLinus Torvalds if (ret) { 5261eb6e2924SPetr Mladek dev_dbg(hub_dev, "error resetting hub: %d\n", ret); 5262eb6e2924SPetr Mladek goto out_autopm; 52631da177e4SLinus Torvalds } 52641da177e4SLinus Torvalds 52651da177e4SLinus Torvalds hub->nerrors = 0; 52661da177e4SLinus Torvalds hub->error = 0; 52671da177e4SLinus Torvalds } 52681da177e4SLinus Torvalds 52691da177e4SLinus Torvalds /* deal with port status changes */ 52703bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 5271097a155fSDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5272a82b76f7SHans de Goede 52735c79a1e3SDan Williams if (test_bit(i, hub->event_bits) 5274af376a46SDan Williams || test_bit(i, hub->change_bits) 52755c79a1e3SDan Williams || test_bit(i, hub->wakeup_bits)) { 52761da177e4SLinus Torvalds /* 5277097a155fSDan Williams * The get_noresume and barrier ensure that if 5278097a155fSDan Williams * the port was in the process of resuming, we 5279097a155fSDan Williams * flush that work and keep the port active for 5280097a155fSDan Williams * the duration of the port_event(). However, 5281097a155fSDan Williams * if the port is runtime pm suspended 5282097a155fSDan Williams * (powered-off), we leave it in that state, run 5283097a155fSDan Williams * an abbreviated port_event(), and move on. 52841da177e4SLinus Torvalds */ 5285097a155fSDan Williams pm_runtime_get_noresume(&port_dev->dev); 5286097a155fSDan Williams pm_runtime_barrier(&port_dev->dev); 52875c79a1e3SDan Williams usb_lock_port(port_dev); 5288af376a46SDan Williams port_event(hub, i); 52895c79a1e3SDan Williams usb_unlock_port(port_dev); 5290097a155fSDan Williams pm_runtime_put_sync(&port_dev->dev); 52911da177e4SLinus Torvalds } 52921da177e4SLinus Torvalds } 52931da177e4SLinus Torvalds 52941da177e4SLinus Torvalds /* deal with hub status changes */ 52951da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 52961da177e4SLinus Torvalds ; /* do nothing */ 52971da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 52981da177e4SLinus Torvalds dev_err(hub_dev, "get_hub_status failed\n"); 52991da177e4SLinus Torvalds else { 53001da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 53011da177e4SLinus Torvalds dev_dbg(hub_dev, "power change\n"); 53021da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 530355c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 530455c52718SAlan Stern /* FIXME: Is this always true? */ 530555c52718SAlan Stern hub->limited_power = 1; 5306403fae78Sjidong xiao else 5307403fae78Sjidong xiao hub->limited_power = 0; 53081da177e4SLinus Torvalds } 53091da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 5310752d57a8SPaul Bolle u16 status = 0; 5311752d57a8SPaul Bolle u16 unused; 5312752d57a8SPaul Bolle 5313752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 53141da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 5315752d57a8SPaul Bolle msleep(500); /* Cool down */ 53168520f380SAlan Stern hub_power_on(hub, true); 5317752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 5318752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 5319eb6e2924SPetr Mladek dev_err(hub_dev, "over-current condition\n"); 53201da177e4SLinus Torvalds } 53211da177e4SLinus Torvalds } 53221da177e4SLinus Torvalds 5323eb6e2924SPetr Mladek out_autopm: 53248e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 53258e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 532632a69589SPetr Mladek out_hdev_lock: 53271da177e4SLinus Torvalds usb_unlock_device(hdev); 532832a69589SPetr Mladek 532932a69589SPetr Mladek /* Balance the stuff in kick_hub_wq() and allow autosuspend */ 533032a69589SPetr Mladek usb_autopm_put_interface(intf); 5331e8054854SAlan Stern kref_put(&hub->kref, hub_release); 53321da177e4SLinus Torvalds } 53331da177e4SLinus Torvalds 53341e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 5335e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 5336e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 5337e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 5338e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 5339e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 53401da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 53411da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 53421da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 53431da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 53441da177e4SLinus Torvalds { } /* Terminating entry */ 53451da177e4SLinus Torvalds }; 53461da177e4SLinus Torvalds 53471da177e4SLinus Torvalds MODULE_DEVICE_TABLE(usb, hub_id_table); 53481da177e4SLinus Torvalds 53491da177e4SLinus Torvalds static struct usb_driver hub_driver = { 53501da177e4SLinus Torvalds .name = "hub", 53511da177e4SLinus Torvalds .probe = hub_probe, 53521da177e4SLinus Torvalds .disconnect = hub_disconnect, 53531da177e4SLinus Torvalds .suspend = hub_suspend, 53541da177e4SLinus Torvalds .resume = hub_resume, 5355f07600cfSAlan Stern .reset_resume = hub_reset_resume, 53567de18d8bSAlan Stern .pre_reset = hub_pre_reset, 53577de18d8bSAlan Stern .post_reset = hub_post_reset, 5358c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 53591da177e4SLinus Torvalds .id_table = hub_id_table, 536040f122f3SAlan Stern .supports_autosuspend = 1, 53611da177e4SLinus Torvalds }; 53621da177e4SLinus Torvalds 53631da177e4SLinus Torvalds int usb_hub_init(void) 53641da177e4SLinus Torvalds { 53651da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 53661da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 53671da177e4SLinus Torvalds usbcore_name); 53681da177e4SLinus Torvalds return -1; 53691da177e4SLinus Torvalds } 53701da177e4SLinus Torvalds 537132a69589SPetr Mladek /* 537232a69589SPetr Mladek * The workqueue needs to be freezable to avoid interfering with 537332a69589SPetr Mladek * USB-PERSIST port handover. Otherwise it might see that a full-speed 537432a69589SPetr Mladek * device was gone before the EHCI controller had handed its port 537532a69589SPetr Mladek * over to the companion full-speed controller. 537632a69589SPetr Mladek */ 5377638139ebSPetr Mladek hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); 537832a69589SPetr Mladek if (hub_wq) 53791da177e4SLinus Torvalds return 0; 53801da177e4SLinus Torvalds 53811da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 53821da177e4SLinus Torvalds usb_deregister(&hub_driver); 538332a69589SPetr Mladek pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); 53841da177e4SLinus Torvalds 53851da177e4SLinus Torvalds return -1; 53861da177e4SLinus Torvalds } 53871da177e4SLinus Torvalds 53881da177e4SLinus Torvalds void usb_hub_cleanup(void) 53891da177e4SLinus Torvalds { 539032a69589SPetr Mladek destroy_workqueue(hub_wq); 53911da177e4SLinus Torvalds 53921da177e4SLinus Torvalds /* 53931da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 53941da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 53951da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 53961da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 53971da177e4SLinus Torvalds * individual hub resources. -greg 53981da177e4SLinus Torvalds */ 53991da177e4SLinus Torvalds usb_deregister(&hub_driver); 54001da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 54011da177e4SLinus Torvalds 5402eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 5403e3376d6cSXenia Ragiadakou struct usb_device_descriptor *old_device_descriptor, 5404e3376d6cSXenia Ragiadakou struct usb_host_bos *old_bos) 54051da177e4SLinus Torvalds { 5406eb764c4bSAlan Stern int changed = 0; 54071da177e4SLinus Torvalds unsigned index; 5408eb764c4bSAlan Stern unsigned serial_len = 0; 5409eb764c4bSAlan Stern unsigned len; 5410eb764c4bSAlan Stern unsigned old_length; 5411eb764c4bSAlan Stern int length; 5412eb764c4bSAlan Stern char *buf; 54131da177e4SLinus Torvalds 5414eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 5415eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 5416eb764c4bSAlan Stern return 1; 5417eb764c4bSAlan Stern 5418e3376d6cSXenia Ragiadakou if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5419e3376d6cSXenia Ragiadakou return 1; 5420e3376d6cSXenia Ragiadakou if (udev->bos) { 5421b9a10481SXenia Ragiadakou len = le16_to_cpu(udev->bos->desc->wTotalLength); 5422b9a10481SXenia Ragiadakou if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5423e3376d6cSXenia Ragiadakou return 1; 5424b9a10481SXenia Ragiadakou if (memcmp(udev->bos->desc, old_bos->desc, len)) 5425e3376d6cSXenia Ragiadakou return 1; 5426e3376d6cSXenia Ragiadakou } 5427e3376d6cSXenia Ragiadakou 5428eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 5429eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 5430eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 5431eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 5432eb764c4bSAlan Stern * different flash card of the same brand). 5433eb764c4bSAlan Stern */ 5434eb764c4bSAlan Stern if (udev->serial) 5435eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 5436eb764c4bSAlan Stern 5437eb764c4bSAlan Stern len = serial_len; 54381da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5439eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5440eb764c4bSAlan Stern len = max(len, old_length); 54411da177e4SLinus Torvalds } 5442eb764c4bSAlan Stern 54430cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 5444b74e7062SWolfram Sang if (!buf) 54451da177e4SLinus Torvalds /* assume the worst */ 54461da177e4SLinus Torvalds return 1; 5447b74e7062SWolfram Sang 54481da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5449eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 54501da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 54511da177e4SLinus Torvalds old_length); 5452eb764c4bSAlan Stern if (length != old_length) { 54531da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 54541da177e4SLinus Torvalds index, length); 5455eb764c4bSAlan Stern changed = 1; 54561da177e4SLinus Torvalds break; 54571da177e4SLinus Torvalds } 54581da177e4SLinus Torvalds if (memcmp(buf, udev->rawdescriptors[index], old_length) 54591da177e4SLinus Torvalds != 0) { 54601da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5461eb764c4bSAlan Stern index, 5462eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 5463eb764c4bSAlan Stern bConfigurationValue); 5464eb764c4bSAlan Stern changed = 1; 54651da177e4SLinus Torvalds break; 54661da177e4SLinus Torvalds } 54671da177e4SLinus Torvalds } 5468eb764c4bSAlan Stern 5469eb764c4bSAlan Stern if (!changed && serial_len) { 5470eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5471eb764c4bSAlan Stern buf, serial_len); 5472eb764c4bSAlan Stern if (length + 1 != serial_len) { 5473eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5474eb764c4bSAlan Stern length); 5475eb764c4bSAlan Stern changed = 1; 5476eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5477eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5478eb764c4bSAlan Stern changed = 1; 5479eb764c4bSAlan Stern } 5480eb764c4bSAlan Stern } 5481eb764c4bSAlan Stern 54821da177e4SLinus Torvalds kfree(buf); 5483eb764c4bSAlan Stern return changed; 54841da177e4SLinus Torvalds } 54851da177e4SLinus Torvalds 54861da177e4SLinus Torvalds /** 5487742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 54881da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 54891da177e4SLinus Torvalds * 549079efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 549179efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5492742120c6SMing Lei * Use usb_reset_device() instead. 54931da177e4SLinus Torvalds * 54941da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 54951da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 54961da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 54971da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 549837ebb549SPetr Mladek * telling hub_wq to pretend the device has been disconnected and then 54991da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 55001da177e4SLinus Torvalds * re-enumerated and probed all over again. 55011da177e4SLinus Torvalds * 5502626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 55031da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 55041da177e4SLinus Torvalds * if the reset wasn't even attempted. 55051da177e4SLinus Torvalds * 5506626f090cSYacine Belkadi * Note: 55075c79a1e3SDan Williams * The caller must own the device lock and the port lock, the latter is 55085c79a1e3SDan Williams * taken by usb_reset_device(). For example, it's safe to use 55095c79a1e3SDan Williams * usb_reset_device() from a driver probe() routine after downloading 55105c79a1e3SDan Williams * new firmware. For calls that might not occur during probe(), drivers 55115c79a1e3SDan Williams * should lock the device using usb_lock_device_for_reset(). 55126bc6cff5SAlan Stern * 55136bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 55146bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 55156bc6cff5SAlan Stern * holding the device lock because these tasks should always call 55165c79a1e3SDan Williams * usb_autopm_resume_device(), thereby preventing any unwanted 55175c79a1e3SDan Williams * autoresume. The autoresume handler is expected to have already 55185c79a1e3SDan Williams * acquired the port lock before calling this routine. 55191da177e4SLinus Torvalds */ 5520742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 55211da177e4SLinus Torvalds { 55221da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 55231da177e4SLinus Torvalds struct usb_hub *parent_hub; 55243f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 55251da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5526e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 55277a7b562dSHans de Goede int i, j, ret = 0; 552812c3da34SAlan Stern int port1 = udev->portnum; 55291da177e4SLinus Torvalds 55301da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 55311da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 55321da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 55331da177e4SLinus Torvalds udev->state); 55341da177e4SLinus Torvalds return -EINVAL; 55351da177e4SLinus Torvalds } 55361da177e4SLinus Torvalds 55375c79a1e3SDan Williams if (!parent_hdev) 55381da177e4SLinus Torvalds return -EISDIR; 55395c79a1e3SDan Williams 5540ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 55411da177e4SLinus Torvalds 5542dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5543dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5544dcc01c08SSarah Sharp */ 5545dcc01c08SSarah Sharp if (udev->usb2_hw_lpm_enabled == 1) 5546dcc01c08SSarah Sharp usb_set_usb2_hardware_lpm(udev, 0); 5547dcc01c08SSarah Sharp 554857edd462SMathias Nyman /* Disable LPM while we reset the device and reinstall the alt settings. 554957edd462SMathias Nyman * Device-initiated LPM, and system exit latency settings are cleared 555057edd462SMathias Nyman * when the device is reset, so we have to set them up again. 55516d1d0513SSarah Sharp */ 55526d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 55536d1d0513SSarah Sharp if (ret) { 55541ccc417eSJoe Perches dev_err(&udev->dev, "%s Failed to disable LPM\n", __func__); 5555464ad8c4SHans Yang goto re_enumerate_no_bos; 55566d1d0513SSarah Sharp } 55576d1d0513SSarah Sharp 5558464ad8c4SHans Yang bos = udev->bos; 5559e5bdfd50SGreg Kroah-Hartman udev->bos = NULL; 5560464ad8c4SHans Yang 55611da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 55621da177e4SLinus Torvalds 55631da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 55641da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5565fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 55661da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5567dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 55681da177e4SLinus Torvalds break; 55691da177e4SLinus Torvalds } 5570d5cbad4bSAlan Stern 55711da177e4SLinus Torvalds if (ret < 0) 55721da177e4SLinus Torvalds goto re_enumerate; 55731da177e4SLinus Torvalds 55741da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5575e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 55761da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 55771da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 55781da177e4SLinus Torvalds goto re_enumerate; 55791da177e4SLinus Torvalds } 55801da177e4SLinus Torvalds 55814fe0387aSAlan Stern /* Restore the device's previous configuration */ 55821da177e4SLinus Torvalds if (!udev->actconfig) 55831da177e4SLinus Torvalds goto done; 55843f0479e0SSarah Sharp 5585d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 55863f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 55873f0479e0SSarah Sharp if (ret < 0) { 55883f0479e0SSarah Sharp dev_warn(&udev->dev, 55893f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 55903f0479e0SSarah Sharp "old configuration.\n"); 5591d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 55923f0479e0SSarah Sharp goto re_enumerate; 55933f0479e0SSarah Sharp } 55941da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 55951da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 55961da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 55971da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 55981da177e4SLinus Torvalds if (ret < 0) { 55991da177e4SLinus Torvalds dev_err(&udev->dev, 56001da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 56011da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5602d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 56031da177e4SLinus Torvalds goto re_enumerate; 56041da177e4SLinus Torvalds } 5605d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 56061da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 56071da177e4SLinus Torvalds 56084fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 56094fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 56104fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 56114fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 56124fe0387aSAlan Stern * endpoint state. 56134fe0387aSAlan Stern */ 56141da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 56153f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 56163f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 56171da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 56181da177e4SLinus Torvalds 56191da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 56204fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 56214fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 56224fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 56234fe0387aSAlan Stern ret = 0; 56244fe0387aSAlan Stern } else { 562504a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 562604a723eaSSarah Sharp * device has been reset, and it will have to use 562704a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 56283f0479e0SSarah Sharp */ 562904a723eaSSarah Sharp intf->resetting_device = 1; 56301da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 56311da177e4SLinus Torvalds desc->bAlternateSetting); 563204a723eaSSarah Sharp intf->resetting_device = 0; 56334fe0387aSAlan Stern } 56341da177e4SLinus Torvalds if (ret < 0) { 56351da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 56361da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 56371da177e4SLinus Torvalds desc->bInterfaceNumber, 56381da177e4SLinus Torvalds desc->bAlternateSetting, 56391da177e4SLinus Torvalds ret); 56401da177e4SLinus Torvalds goto re_enumerate; 56411da177e4SLinus Torvalds } 56427a7b562dSHans de Goede /* Resetting also frees any allocated streams */ 56437a7b562dSHans de Goede for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) 56447a7b562dSHans de Goede intf->cur_altsetting->endpoint[j].streams = 0; 56451da177e4SLinus Torvalds } 56461da177e4SLinus Torvalds 56471da177e4SLinus Torvalds done: 5648f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 5649de68bab4SSarah Sharp usb_set_usb2_hardware_lpm(udev, 1); 565078d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5651f74631e3SSarah Sharp usb_enable_ltm(udev); 5652e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5653e3376d6cSXenia Ragiadakou udev->bos = bos; 56541da177e4SLinus Torvalds return 0; 56551da177e4SLinus Torvalds 56561da177e4SLinus Torvalds re_enumerate: 5657e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5658e3376d6cSXenia Ragiadakou udev->bos = bos; 5659464ad8c4SHans Yang re_enumerate_no_bos: 5660464ad8c4SHans Yang /* LPM state doesn't matter when we're about to destroy the device. */ 5661464ad8c4SHans Yang hub_port_logical_disconnect(parent_hub, port1); 56621da177e4SLinus Torvalds return -ENODEV; 56631da177e4SLinus Torvalds } 56641da177e4SLinus Torvalds 56651da177e4SLinus Torvalds /** 56661da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 56671da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 56681da177e4SLinus Torvalds * 566979efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 567079efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5671742120c6SMing Lei * the reset is over (using their post_reset method). 567279efa097SAlan Stern * 5673626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 567479efa097SAlan Stern * 5675626f090cSYacine Belkadi * Note: 567679efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 567779efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 567879efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5679742120c6SMing Lei * the device using usb_lock_device_for_reset(). 568079efa097SAlan Stern * 568179efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 568279efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 568379efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 568479efa097SAlan Stern * we attempt to unbind it and rebind afterward. 568579efa097SAlan Stern */ 5686742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 568779efa097SAlan Stern { 568879efa097SAlan Stern int ret; 5689852c4b43SAlan Stern int i; 56904d769defSMing Lei unsigned int noio_flag; 56915c79a1e3SDan Williams struct usb_port *port_dev; 569279efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 56935c79a1e3SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 569479efa097SAlan Stern 569579efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 569679efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 569779efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 569879efa097SAlan Stern udev->state); 569979efa097SAlan Stern return -EINVAL; 570079efa097SAlan Stern } 570179efa097SAlan Stern 57025c79a1e3SDan Williams if (!udev->parent) { 57035c79a1e3SDan Williams /* this requires hcd-specific logic; see ohci_restart() */ 57045c79a1e3SDan Williams dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 57055c79a1e3SDan Williams return -EISDIR; 57065c79a1e3SDan Williams } 57075c79a1e3SDan Williams 57085c79a1e3SDan Williams port_dev = hub->ports[udev->portnum - 1]; 57095c79a1e3SDan Williams 57104d769defSMing Lei /* 57114d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 57124d769defSMing Lei * context to avoid possible deadlock if usb mass 57134d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 57144d769defSMing Lei * is included in current configuration. The easist 57154d769defSMing Lei * approach is to do it for every device reset, 57164d769defSMing Lei * because the device 'memalloc_noio' flag may have 57174d769defSMing Lei * not been set before reseting the usb device. 57184d769defSMing Lei */ 57194d769defSMing Lei noio_flag = memalloc_noio_save(); 57204d769defSMing Lei 5721645daaabSAlan Stern /* Prevent autosuspend during the reset */ 572294fcda1fSAlan Stern usb_autoresume_device(udev); 5723645daaabSAlan Stern 572479efa097SAlan Stern if (config) { 5725852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5726852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 572779efa097SAlan Stern struct usb_driver *drv; 572878d9a487SAlan Stern int unbind = 0; 572979efa097SAlan Stern 5730852c4b43SAlan Stern if (cintf->dev.driver) { 573179efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 573278d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 573378d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 573478d9a487SAlan Stern else if (cintf->condition == 573578d9a487SAlan Stern USB_INTERFACE_BOUND) 573678d9a487SAlan Stern unbind = 1; 573778d9a487SAlan Stern if (unbind) 573878d9a487SAlan Stern usb_forced_unbind_intf(cintf); 573979efa097SAlan Stern } 574079efa097SAlan Stern } 574179efa097SAlan Stern } 574279efa097SAlan Stern 57435c79a1e3SDan Williams usb_lock_port(port_dev); 5744742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 57455c79a1e3SDan Williams usb_unlock_port(port_dev); 574679efa097SAlan Stern 574779efa097SAlan Stern if (config) { 5748852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5749852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 575079efa097SAlan Stern struct usb_driver *drv; 575178d9a487SAlan Stern int rebind = cintf->needs_binding; 575279efa097SAlan Stern 575378d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 575479efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 575579efa097SAlan Stern if (drv->post_reset) 575678d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 575778d9a487SAlan Stern else if (cintf->condition == 575878d9a487SAlan Stern USB_INTERFACE_BOUND) 575978d9a487SAlan Stern rebind = 1; 57606aec044cSAlan Stern if (rebind) 57616aec044cSAlan Stern cintf->needs_binding = 1; 576279efa097SAlan Stern } 576379efa097SAlan Stern } 57646aec044cSAlan Stern usb_unbind_and_rebind_marked_interfaces(udev); 576579efa097SAlan Stern } 576679efa097SAlan Stern 576794fcda1fSAlan Stern usb_autosuspend_device(udev); 57684d769defSMing Lei memalloc_noio_restore(noio_flag); 576979efa097SAlan Stern return ret; 577079efa097SAlan Stern } 5771742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5772dc023dceSInaky Perez-Gonzalez 5773dc023dceSInaky Perez-Gonzalez 5774dc023dceSInaky Perez-Gonzalez /** 5775dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5776dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5777dc023dceSInaky Perez-Gonzalez * 5778dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5779dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5780dc023dceSInaky Perez-Gonzalez * 5781dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5782dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5783dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5784dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5785dc023dceSInaky Perez-Gonzalez * 5786dc023dceSInaky Perez-Gonzalez * Corner cases: 5787dc023dceSInaky Perez-Gonzalez * 5788dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5789dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5790dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5791dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5792dc023dceSInaky Perez-Gonzalez * 5793524134d4SAlan Stern * - If the reset is delayed so long that the interface is unbound from 5794524134d4SAlan Stern * its driver, the reset will be skipped. 5795dc023dceSInaky Perez-Gonzalez * 5796524134d4SAlan Stern * - This function can be called during .probe(). It can also be called 5797524134d4SAlan Stern * during .disconnect(), but doing so is pointless because the reset 5798524134d4SAlan Stern * will not occur. If you really want to reset the device during 5799524134d4SAlan Stern * .disconnect(), call usb_reset_device() directly -- but watch out 5800524134d4SAlan Stern * for nested unbinding issues! 5801dc023dceSInaky Perez-Gonzalez */ 5802dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5803dc023dceSInaky Perez-Gonzalez { 5804524134d4SAlan Stern if (schedule_work(&iface->reset_ws)) 5805524134d4SAlan Stern usb_get_intf(iface); 5806dc023dceSInaky Perez-Gonzalez } 5807dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5808ff823c79SLan Tianyu 5809ff823c79SLan Tianyu /** 5810ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5811ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5812ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5813ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5814ff823c79SLan Tianyu * is attached to. 5815ff823c79SLan Tianyu * 5816ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5817ff823c79SLan Tianyu * pointer. 5818ff823c79SLan Tianyu * 5819626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5820ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5821ff823c79SLan Tianyu */ 5822ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5823ff823c79SLan Tianyu int port1) 5824ff823c79SLan Tianyu { 5825ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5826ff823c79SLan Tianyu 5827ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5828ff823c79SLan Tianyu return NULL; 5829ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5830ff823c79SLan Tianyu } 5831ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5832d5575424SLan Tianyu 5833d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5834d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5835d2123fd9SLan Tianyu { 5836d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5837d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5838d2123fd9SLan Tianyu int i; 5839d2123fd9SLan Tianyu 5840d99f6b41SDan Williams if (!hub) 5841d99f6b41SDan Williams return; 5842d99f6b41SDan Williams 5843d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5844d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5845d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5846d2123fd9SLan Tianyu 5847d99f6b41SDan Williams connect_type = port_dev->connect_type; 5848d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5849d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5850d2123fd9SLan Tianyu 5851d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5852d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5853d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5854d2123fd9SLan Tianyu } 5855d2123fd9SLan Tianyu } 5856d2123fd9SLan Tianyu } 5857d2123fd9SLan Tianyu } else { 5858d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5859d2123fd9SLan Tianyu 5860d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5861d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5862d2123fd9SLan Tianyu 5863d99f6b41SDan Williams connect_type = port_dev->connect_type; 5864d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5865d2123fd9SLan Tianyu u16 mask = 1 << i; 5866d2123fd9SLan Tianyu 5867d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5868d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5869d2123fd9SLan Tianyu port_removable |= mask; 5870d2123fd9SLan Tianyu } 5871d2123fd9SLan Tianyu } 5872d2123fd9SLan Tianyu } 5873d2123fd9SLan Tianyu 5874d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5875d2123fd9SLan Tianyu } 5876d2123fd9SLan Tianyu } 5877d2123fd9SLan Tianyu 5878d5575424SLan Tianyu #ifdef CONFIG_ACPI 5879d5575424SLan Tianyu /** 5880d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5881d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5882d5575424SLan Tianyu * @port1: port num of the port 5883d5575424SLan Tianyu * 5884626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5885626f090cSYacine Belkadi * invalid. 5886d5575424SLan Tianyu */ 5887d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5888d5575424SLan Tianyu int port1) 5889d5575424SLan Tianyu { 5890ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5891d5575424SLan Tianyu 589241341261SMathias Nyman if (!hub) 589341341261SMathias Nyman return NULL; 589441341261SMathias Nyman 58953a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5896d5575424SLan Tianyu } 5897d5575424SLan Tianyu #endif 5898