11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB hub driver. 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * (C) Copyright 1999 Linus Torvalds 51da177e4SLinus Torvalds * (C) Copyright 1999 Johannes Erdfelt 61da177e4SLinus Torvalds * (C) Copyright 1999 Gregory P. Smith 71da177e4SLinus Torvalds * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) 81da177e4SLinus Torvalds * 9b65fba3dSGreg Kroah-Hartman * Released under the GPLv2 only. 10b65fba3dSGreg Kroah-Hartman * SPDX-License-Identifier: GPL-2.0 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 41fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 429ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 431da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 441da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 451da177e4SLinus Torvalds 4632a69589SPetr Mladek /* workqueue to process hub events */ 4732a69589SPetr Mladek static struct workqueue_struct *hub_wq; 4832a69589SPetr Mladek static void hub_event(struct work_struct *work); 491da177e4SLinus Torvalds 50d8521afeSDan Williams /* synchronize hub-port add/remove and peering operations */ 51d8521afeSDan Williams DEFINE_MUTEX(usb_port_peer_mutex); 52d8521afeSDan Williams 531da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 54a44007a4SSaurabh Sengar static bool blinkenlights; 551da177e4SLinus Torvalds module_param(blinkenlights, bool, S_IRUGO); 561da177e4SLinus Torvalds MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* 59fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 60fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 61fd7c519dSJaroslav Kysela */ 62fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 63fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 64fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 65b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 66b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 67b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 68fd7c519dSJaroslav Kysela 69fd7c519dSJaroslav Kysela /* 701da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 711da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 721da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 731da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 741da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 751da177e4SLinus Torvalds * following module parameters. 761da177e4SLinus Torvalds * 771da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 781da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 791da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 801da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 811da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 821da177e4SLinus Torvalds */ 83a44007a4SSaurabh Sengar static bool old_scheme_first; 841da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 851da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 861da177e4SLinus Torvalds "start with the old device initialization scheme"); 871da177e4SLinus Torvalds 8890ab5ee9SRusty Russell static bool use_both_schemes = 1; 891da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 901da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 911da177e4SLinus Torvalds "try the other device initialization scheme if the " 921da177e4SLinus Torvalds "first one fails"); 931da177e4SLinus Torvalds 9432fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 9532fe0198SAlan Stern * port reset on some companion controllers. 9632fe0198SAlan Stern */ 9732fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 9832fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 9932fe0198SAlan Stern 100ad493e5eSLan Tianyu #define HUB_DEBOUNCE_TIMEOUT 2000 101948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 102948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 103948fea37SAlan Stern 10432a69589SPetr Mladek static void hub_release(struct kref *kref); 105742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 1063bc02bceSGeert Uytterhoeven static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); 107742120c6SMing Lei 108131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1091da177e4SLinus Torvalds { 110d64aab0cSOliver Neukum if (hub_is_superspeedplus(hub->hdev)) 111d64aab0cSOliver Neukum return "10.0 Gb/s"; 112131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 113131dec34SSarah Sharp return "5.0 Gb/s"; 114288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1151da177e4SLinus Torvalds return "480 Mb/s"; 116288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1171da177e4SLinus Torvalds return "1.5 Mb/s"; 1181da177e4SLinus Torvalds else 1191da177e4SLinus Torvalds return "12 Mb/s"; 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 123ad493e5eSLan Tianyu struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) 1241da177e4SLinus Torvalds { 125ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 12625118084SAlan Stern return NULL; 1271da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 1302d2a3167SLu Baolu int usb_device_supports_lpm(struct usb_device *udev) 131d9b2099cSSarah Sharp { 132ad87e032SAlan Stern /* Some devices have trouble with LPM */ 133ad87e032SAlan Stern if (udev->quirks & USB_QUIRK_NO_LPM) 134ad87e032SAlan Stern return 0; 135ad87e032SAlan Stern 136d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 137d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 138d9b2099cSSarah Sharp */ 139a8425292SRupesh Tatiya if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { 140d9b2099cSSarah Sharp if (udev->bos->ext_cap && 141d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 142d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 143d9b2099cSSarah Sharp return 1; 144d9b2099cSSarah Sharp return 0; 145d9b2099cSSarah Sharp } 14651e0a012SSarah Sharp 14725cd2882SSarah Sharp /* 14825cd2882SSarah Sharp * According to the USB 3.0 spec, all USB 3.0 devices must support LPM. 14925cd2882SSarah Sharp * However, there are some that don't, and they set the U1/U2 exit 15025cd2882SSarah Sharp * latencies to zero. 15151e0a012SSarah Sharp */ 15251e0a012SSarah Sharp if (!udev->bos->ss_cap) { 15325cd2882SSarah Sharp dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); 154d9b2099cSSarah Sharp return 0; 155d9b2099cSSarah Sharp } 15651e0a012SSarah Sharp 15725cd2882SSarah Sharp if (udev->bos->ss_cap->bU1devExitLat == 0 && 15825cd2882SSarah Sharp udev->bos->ss_cap->bU2DevExitLat == 0) { 15925cd2882SSarah Sharp if (udev->parent) 16025cd2882SSarah Sharp dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); 16125cd2882SSarah Sharp else 16225cd2882SSarah Sharp dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); 16325cd2882SSarah Sharp return 0; 16425cd2882SSarah Sharp } 16525cd2882SSarah Sharp 16625cd2882SSarah Sharp if (!udev->parent || udev->parent->lpm_capable) 16725cd2882SSarah Sharp return 1; 16851e0a012SSarah Sharp return 0; 16951e0a012SSarah Sharp } 17051e0a012SSarah Sharp 17151e0a012SSarah Sharp /* 17251e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 17351e0a012SSarah Sharp * either U1 or U2. 17451e0a012SSarah Sharp */ 17551e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 17651e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 17751e0a012SSarah Sharp unsigned int udev_exit_latency, 17851e0a012SSarah Sharp struct usb_hub *hub, 17951e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 18051e0a012SSarah Sharp unsigned int hub_exit_latency) 18151e0a012SSarah Sharp { 18251e0a012SSarah Sharp unsigned int total_mel; 18351e0a012SSarah Sharp unsigned int device_mel; 18451e0a012SSarah Sharp unsigned int hub_mel; 18551e0a012SSarah Sharp 18651e0a012SSarah Sharp /* 18751e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 18851e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 18951e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 19051e0a012SSarah Sharp * bound for. 19151e0a012SSarah Sharp * 19251e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 19351e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 19451e0a012SSarah Sharp */ 19551e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 19651e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 19751e0a012SSarah Sharp 19851e0a012SSarah Sharp /* 19951e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 20051e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 20151e0a012SSarah Sharp * latency. 20251e0a012SSarah Sharp * 20351e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 20451e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 20551e0a012SSarah Sharp */ 20651e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 20751e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 20851e0a012SSarah Sharp if (device_mel > hub_mel) 20951e0a012SSarah Sharp total_mel += device_mel; 21051e0a012SSarah Sharp else 21151e0a012SSarah Sharp total_mel += hub_mel; 21251e0a012SSarah Sharp 21351e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 21451e0a012SSarah Sharp } 21551e0a012SSarah Sharp 21651e0a012SSarah Sharp /* 21751e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 21851e0a012SSarah Sharp * a transition from either U1 or U2. 21951e0a012SSarah Sharp */ 22051e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 22151e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 22251e0a012SSarah Sharp unsigned int udev_exit_latency, 22351e0a012SSarah Sharp struct usb_hub *hub, 22451e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 22551e0a012SSarah Sharp unsigned int hub_exit_latency, 22651e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 22751e0a012SSarah Sharp { 22851e0a012SSarah Sharp unsigned int first_link_pel; 22951e0a012SSarah Sharp unsigned int hub_pel; 23051e0a012SSarah Sharp 23151e0a012SSarah Sharp /* 23251e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 23351e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 23451e0a012SSarah Sharp * the device exit latency or the hub exit latency. 23551e0a012SSarah Sharp */ 23651e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 23751e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 23851e0a012SSarah Sharp else 23951e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 24051e0a012SSarah Sharp 24151e0a012SSarah Sharp /* 24251e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 24351e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 24451e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 24551e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 24651e0a012SSarah Sharp */ 24751e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 24851e0a012SSarah Sharp 24951e0a012SSarah Sharp /* 25051e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 25151e0a012SSarah Sharp * is the greater of the two exit latencies. 25251e0a012SSarah Sharp */ 25351e0a012SSarah Sharp if (first_link_pel > hub_pel) 25451e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 25551e0a012SSarah Sharp else 25651e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 25751e0a012SSarah Sharp } 25851e0a012SSarah Sharp 25951e0a012SSarah Sharp /* 26051e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 26151e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 26251e0a012SSarah Sharp * first packet from the host controller. 26351e0a012SSarah Sharp * 26451e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 26551e0a012SSarah Sharp * - t1: device PEL 26651e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 26751e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 26851e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 26951e0a012SSarah Sharp * 27051e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 27151e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 27251e0a012SSarah Sharp * vendor says otherwise. 27351e0a012SSarah Sharp */ 27451e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 27551e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 27651e0a012SSarah Sharp { 27751e0a012SSarah Sharp struct usb_device *parent; 27851e0a012SSarah Sharp unsigned int num_hubs; 27951e0a012SSarah Sharp unsigned int total_sel; 28051e0a012SSarah Sharp 28151e0a012SSarah Sharp /* t1 = device PEL */ 28251e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 28351e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 28451e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 28551e0a012SSarah Sharp parent = parent->parent) 28651e0a012SSarah Sharp num_hubs++; 28751e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 28851e0a012SSarah Sharp if (num_hubs > 0) 28951e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 29051e0a012SSarah Sharp 29151e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 29251e0a012SSarah Sharp total_sel += 250 * num_hubs; 29351e0a012SSarah Sharp 29451e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 29551e0a012SSarah Sharp } 29651e0a012SSarah Sharp 29751e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 29851e0a012SSarah Sharp { 29951e0a012SSarah Sharp struct usb_hub *hub; 30051e0a012SSarah Sharp unsigned int port_to_port_delay; 30151e0a012SSarah Sharp unsigned int udev_u1_del; 30251e0a012SSarah Sharp unsigned int udev_u2_del; 30351e0a012SSarah Sharp unsigned int hub_u1_del; 30451e0a012SSarah Sharp unsigned int hub_u2_del; 30551e0a012SSarah Sharp 3068a1b2725SMathias Nyman if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) 30751e0a012SSarah Sharp return; 30851e0a012SSarah Sharp 309ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 31051e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 31151e0a012SSarah Sharp * doesn't have an upstream link. 31251e0a012SSarah Sharp */ 31351e0a012SSarah Sharp if (!hub) 31451e0a012SSarah Sharp return; 31551e0a012SSarah Sharp 31651e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3174d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 31851e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3194d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 32051e0a012SSarah Sharp 32151e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 32251e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 32351e0a012SSarah Sharp 32451e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 32551e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 32651e0a012SSarah Sharp 32751e0a012SSarah Sharp /* 32851e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 32951e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 33051e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 33151e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 33251e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 33351e0a012SSarah Sharp * 33451e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 33551e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 33651e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 33751e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 33851e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 33951e0a012SSarah Sharp * exit latencies. 34051e0a012SSarah Sharp * 34151e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 34251e0a012SSarah Sharp * latency? It's possible, although not likely... 34351e0a012SSarah Sharp */ 34451e0a012SSarah Sharp port_to_port_delay = 1; 34551e0a012SSarah Sharp 34651e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 34751e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 34851e0a012SSarah Sharp port_to_port_delay); 34951e0a012SSarah Sharp 35051e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 35151e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 35251e0a012SSarah Sharp else 35351e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 35451e0a012SSarah Sharp 35551e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 35651e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 35751e0a012SSarah Sharp port_to_port_delay); 35851e0a012SSarah Sharp 35951e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 36051e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 36151e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 36251e0a012SSarah Sharp } 363d9b2099cSSarah Sharp 3641da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 365bec444cdSJohan Hovold static int get_hub_descriptor(struct usb_device *hdev, 366bec444cdSJohan Hovold struct usb_hub_descriptor *desc) 3671da177e4SLinus Torvalds { 368dbe79bbeSJohn Youn int i, ret, size; 369dbe79bbeSJohn Youn unsigned dtype; 370dbe79bbeSJohn Youn 371dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 372dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 373dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 374dbe79bbeSJohn Youn } else { 375dbe79bbeSJohn Youn dtype = USB_DT_HUB; 376dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 377dbe79bbeSJohn Youn } 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3801da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3811da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 382bec444cdSJohan Hovold dtype << 8, 0, desc, size, 3831da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3842c25a2c8SJohan Hovold if (hub_is_superspeed(hdev)) { 3852c25a2c8SJohan Hovold if (ret == size) 3861da177e4SLinus Torvalds return ret; 387bec444cdSJohan Hovold } else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) { 388bec444cdSJohan Hovold /* Make sure we have the DeviceRemovable field. */ 389bec444cdSJohan Hovold size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1; 390bec444cdSJohan Hovold if (ret < size) 391bec444cdSJohan Hovold return -EMSGSIZE; 3922c25a2c8SJohan Hovold return ret; 3932c25a2c8SJohan Hovold } 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds return -EINVAL; 3961da177e4SLinus Torvalds } 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvalds /* 3991da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 4001da177e4SLinus Torvalds */ 4011da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 4021da177e4SLinus Torvalds { 4031da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4041da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds /* 4081da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 4091da177e4SLinus Torvalds */ 410ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 4111da177e4SLinus Torvalds { 4121da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4131da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 4141da177e4SLinus Torvalds NULL, 0, 1000); 4151da177e4SLinus Torvalds } 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /* 4181da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 4191da177e4SLinus Torvalds */ 4201da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4211da177e4SLinus Torvalds { 4221da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4231da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4241da177e4SLinus Torvalds NULL, 0, 1000); 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 427d99f6b41SDan Williams static char *to_led_name(int selector) 428d99f6b41SDan Williams { 429d99f6b41SDan Williams switch (selector) { 430d99f6b41SDan Williams case HUB_LED_AMBER: 431d99f6b41SDan Williams return "amber"; 432d99f6b41SDan Williams case HUB_LED_GREEN: 433d99f6b41SDan Williams return "green"; 434d99f6b41SDan Williams case HUB_LED_OFF: 435d99f6b41SDan Williams return "off"; 436d99f6b41SDan Williams case HUB_LED_AUTO: 437d99f6b41SDan Williams return "auto"; 438d99f6b41SDan Williams default: 439d99f6b41SDan Williams return "??"; 440d99f6b41SDan Williams } 441d99f6b41SDan Williams } 442d99f6b41SDan Williams 4431da177e4SLinus Torvalds /* 4441da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4451da177e4SLinus Torvalds * for info about using port indicators 4461da177e4SLinus Torvalds */ 447d99f6b41SDan Williams static void set_port_led(struct usb_hub *hub, int port1, int selector) 4481da177e4SLinus Torvalds { 449d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 450d99f6b41SDan Williams int status; 451d99f6b41SDan Williams 452d99f6b41SDan Williams status = set_port_feature(hub->hdev, (selector << 8) | port1, 4531da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 454d99f6b41SDan Williams dev_dbg(&port_dev->dev, "indicator %s status %d\n", 455d99f6b41SDan Williams to_led_name(selector), status); 4561da177e4SLinus Torvalds } 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4591da177e4SLinus Torvalds 460c4028958SDavid Howells static void led_work(struct work_struct *work) 4611da177e4SLinus Torvalds { 462c4028958SDavid Howells struct usb_hub *hub = 463c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4641da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4651da177e4SLinus Torvalds unsigned i; 4661da177e4SLinus Torvalds unsigned changed = 0; 4671da177e4SLinus Torvalds int cursor = -1; 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4701da177e4SLinus Torvalds return; 4711da177e4SLinus Torvalds 4723bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4731da177e4SLinus Torvalds unsigned selector, mode; 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds switch (hub->indicator[i]) { 4781da177e4SLinus Torvalds /* cycle marker */ 4791da177e4SLinus Torvalds case INDICATOR_CYCLE: 4801da177e4SLinus Torvalds cursor = i; 4811da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4821da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4831da177e4SLinus Torvalds break; 4841da177e4SLinus Torvalds /* blinking green = sw attention */ 4851da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4861da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4871da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4881da177e4SLinus Torvalds break; 4891da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4901da177e4SLinus Torvalds selector = HUB_LED_OFF; 4911da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4921da177e4SLinus Torvalds break; 4931da177e4SLinus Torvalds /* blinking amber = hw attention */ 4941da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4951da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4961da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 4971da177e4SLinus Torvalds break; 4981da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 4991da177e4SLinus Torvalds selector = HUB_LED_OFF; 5001da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 5011da177e4SLinus Torvalds break; 5021da177e4SLinus Torvalds /* blink green/amber = reserved */ 5031da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 5041da177e4SLinus Torvalds selector = HUB_LED_GREEN; 5051da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 5061da177e4SLinus Torvalds break; 5071da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 5081da177e4SLinus Torvalds selector = HUB_LED_AMBER; 5091da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 5101da177e4SLinus Torvalds break; 5111da177e4SLinus Torvalds default: 5121da177e4SLinus Torvalds continue; 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 5151da177e4SLinus Torvalds changed = 1; 5161da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 5171da177e4SLinus Torvalds hub->indicator[i] = mode; 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds if (!changed && blinkenlights) { 5201da177e4SLinus Torvalds cursor++; 5213bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 5221da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 5231da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 5241da177e4SLinus Torvalds changed++; 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds if (changed) 52722f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 52822f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5321da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5331da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /* 5361da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5371da177e4SLinus Torvalds */ 5381da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5391da177e4SLinus Torvalds struct usb_hub_status *data) 5401da177e4SLinus Torvalds { 5411da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5421da177e4SLinus Torvalds 5433824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5443824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5451da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5461da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5471da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds return status; 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds /* 5531da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5540cdd49a1SMathias Nyman * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 5551da177e4SLinus Torvalds */ 5561da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5570cdd49a1SMathias Nyman void *data, u16 value, u16 length) 5581da177e4SLinus Torvalds { 5591da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5601da177e4SLinus Torvalds 5613824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5623824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5631da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5640cdd49a1SMathias Nyman USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, 5650cdd49a1SMathias Nyman port1, data, length, USB_STS_TIMEOUT); 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds return status; 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5700cdd49a1SMathias Nyman static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, 5710cdd49a1SMathias Nyman u16 *status, u16 *change, u32 *ext_status) 5723eb14915SAlan Stern { 5733eb14915SAlan Stern int ret; 5740cdd49a1SMathias Nyman int len = 4; 5750cdd49a1SMathias Nyman 5760cdd49a1SMathias Nyman if (type != HUB_PORT_STATUS) 5770cdd49a1SMathias Nyman len = 8; 5783eb14915SAlan Stern 5793eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5800cdd49a1SMathias Nyman ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); 5810cdd49a1SMathias Nyman if (ret < len) { 582e9e88fb7SAlan Stern if (ret != -ENODEV) 5833eb14915SAlan Stern dev_err(hub->intfdev, 5843eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5853eb14915SAlan Stern if (ret >= 0) 5863eb14915SAlan Stern ret = -EIO; 5873eb14915SAlan Stern } else { 5883eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5893eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 5900cdd49a1SMathias Nyman if (type != HUB_PORT_STATUS && ext_status) 5910cdd49a1SMathias Nyman *ext_status = le32_to_cpu( 5920cdd49a1SMathias Nyman hub->status->port.dwExtPortStatus); 5933eb14915SAlan Stern ret = 0; 5943eb14915SAlan Stern } 5953eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5963eb14915SAlan Stern return ret; 5973eb14915SAlan Stern } 5983eb14915SAlan Stern 5990cdd49a1SMathias Nyman static int hub_port_status(struct usb_hub *hub, int port1, 6000cdd49a1SMathias Nyman u16 *status, u16 *change) 6010cdd49a1SMathias Nyman { 6020cdd49a1SMathias Nyman return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, 6030cdd49a1SMathias Nyman status, change, NULL); 6040cdd49a1SMathias Nyman } 6050cdd49a1SMathias Nyman 60632a69589SPetr Mladek static void kick_hub_wq(struct usb_hub *hub) 6071da177e4SLinus Torvalds { 60832a69589SPetr Mladek struct usb_interface *intf; 6091da177e4SLinus Torvalds 61032a69589SPetr Mladek if (hub->disconnected || work_pending(&hub->events)) 61132a69589SPetr Mladek return; 6128e4ceb38SAlan Stern 61332a69589SPetr Mladek /* 61432a69589SPetr Mladek * Suppress autosuspend until the event is proceed. 61532a69589SPetr Mladek * 61632a69589SPetr Mladek * Be careful and make sure that the symmetric operation is 61732a69589SPetr Mladek * always called. We are here only when there is no pending 61832a69589SPetr Mladek * work for this hub. Therefore put the interface either when 61932a69589SPetr Mladek * the new work is called or when it is canceled. 62032a69589SPetr Mladek */ 62132a69589SPetr Mladek intf = to_usb_interface(hub->intfdev); 62232a69589SPetr Mladek usb_autopm_get_interface_no_resume(intf); 62332a69589SPetr Mladek kref_get(&hub->kref); 62432a69589SPetr Mladek 62532a69589SPetr Mladek if (queue_work(hub_wq, &hub->events)) 62632a69589SPetr Mladek return; 62732a69589SPetr Mladek 62832a69589SPetr Mladek /* the work has already been scheduled */ 62932a69589SPetr Mladek usb_autopm_put_interface_async(intf); 63032a69589SPetr Mladek kref_put(&hub->kref, hub_release); 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 63359d48b3fSPetr Mladek void usb_kick_hub_wq(struct usb_device *hdev) 6341da177e4SLinus Torvalds { 635ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 63625118084SAlan Stern 63725118084SAlan Stern if (hub) 63832a69589SPetr Mladek kick_hub_wq(hub); 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds 6414ee823b8SSarah Sharp /* 6424ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 6434ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 6444ee823b8SSarah Sharp * 6454ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 6464ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 6474ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 6484ee823b8SSarah Sharp */ 6494ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 6504ee823b8SSarah Sharp unsigned int portnum) 6514ee823b8SSarah Sharp { 6524ee823b8SSarah Sharp struct usb_hub *hub; 6534ee823b8SSarah Sharp 6544ee823b8SSarah Sharp if (!hdev) 6554ee823b8SSarah Sharp return; 6564ee823b8SSarah Sharp 657ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6584ee823b8SSarah Sharp if (hub) { 6594ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 66032a69589SPetr Mladek kick_hub_wq(hub); 6614ee823b8SSarah Sharp } 6624ee823b8SSarah Sharp } 6634ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6667d12e780SDavid Howells static void hub_irq(struct urb *urb) 6671da177e4SLinus Torvalds { 668ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 669e015268dSAlan Stern int status = urb->status; 67071d2718fSRoel Kluin unsigned i; 6711da177e4SLinus Torvalds unsigned long bits; 6721da177e4SLinus Torvalds 673e015268dSAlan Stern switch (status) { 6741da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6751da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6761da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6771da177e4SLinus Torvalds return; 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds default: /* presumably an error */ 6801da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 681e015268dSAlan Stern dev_dbg(hub->intfdev, "transfer --> %d\n", status); 6821da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6831da177e4SLinus Torvalds goto resubmit; 684e015268dSAlan Stern hub->error = status; 6851da177e4SLinus Torvalds /* FALL THROUGH */ 6861da177e4SLinus Torvalds 68737ebb549SPetr Mladek /* let hub_wq handle things */ 6881da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6891da177e4SLinus Torvalds bits = 0; 6901da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6911da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 6921da177e4SLinus Torvalds << (i*8); 6931da177e4SLinus Torvalds hub->event_bits[0] = bits; 6941da177e4SLinus Torvalds break; 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds hub->nerrors = 0; 6981da177e4SLinus Torvalds 69937ebb549SPetr Mladek /* Something happened, let hub_wq figure it out */ 70032a69589SPetr Mladek kick_hub_wq(hub); 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds resubmit: 7031da177e4SLinus Torvalds if (hub->quiescing) 7041da177e4SLinus Torvalds return; 7051da177e4SLinus Torvalds 706088a3daeSKris Borer status = usb_submit_urb(hub->urb, GFP_ATOMIC); 707088a3daeSKris Borer if (status != 0 && status != -ENODEV && status != -EPERM) 7081da177e4SLinus Torvalds dev_err(hub->intfdev, "resubmit --> %d\n", status); 7091da177e4SLinus Torvalds } 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 7121da177e4SLinus Torvalds static inline int 7131da177e4SLinus Torvalds hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) 7141da177e4SLinus Torvalds { 7152c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 7162c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 7172c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 7182c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 7192c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 7202c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 7212c7b871bSWilliam Gulland if (status) 7222c7b871bSWilliam Gulland return status; 7232c7b871bSWilliam Gulland } 724c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 7251da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 7261da177e4SLinus Torvalds tt, NULL, 0, 1000); 7271da177e4SLinus Torvalds } 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds /* 73037ebb549SPetr Mladek * enumeration blocks hub_wq for a long time. we use keventd instead, since 7311da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 7321da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 7331da177e4SLinus Torvalds * both can talk to the same hub concurrently. 7341da177e4SLinus Torvalds */ 735cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 7361da177e4SLinus Torvalds { 737c4028958SDavid Howells struct usb_hub *hub = 738cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 7391da177e4SLinus Torvalds unsigned long flags; 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds spin_lock_irqsave(&hub->tt.lock, flags); 7423b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 743d0f830d3SH Hartley Sweeten struct list_head *next; 7441da177e4SLinus Torvalds struct usb_tt_clear *clear; 7451da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 746cb88a1b8SAlan Stern const struct hc_driver *drv; 7471da177e4SLinus Torvalds int status; 7481da177e4SLinus Torvalds 749d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 750d0f830d3SH Hartley Sweeten clear = list_entry(next, struct usb_tt_clear, clear_list); 7511da177e4SLinus Torvalds list_del(&clear->clear_list); 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7541da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7551da177e4SLinus Torvalds status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); 756e9e88fb7SAlan Stern if (status && status != -ENODEV) 7571da177e4SLinus Torvalds dev_err(&hdev->dev, 7581da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7591da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 760cb88a1b8SAlan Stern 761cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 762cb88a1b8SAlan Stern drv = clear->hcd->driver; 763cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 764cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 765cb88a1b8SAlan Stern 7661da177e4SLinus Torvalds kfree(clear); 767cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds spin_unlock_irqrestore(&hub->tt.lock, flags); 7701da177e4SLinus Torvalds } 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds /** 773971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 77441341261SMathias Nyman * @hdev: USB device belonging to the usb hub 77541341261SMathias Nyman * @hub: target hub 776971fcd49SLan Tianyu * @port1: port index 777971fcd49SLan Tianyu * @set: expected status 778971fcd49SLan Tianyu * 779971fcd49SLan Tianyu * call this function to control port's power via setting or 780971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 781626f090cSYacine Belkadi * 782626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 783971fcd49SLan Tianyu */ 78441341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 78541341261SMathias Nyman int port1, bool set) 786971fcd49SLan Tianyu { 787971fcd49SLan Tianyu int ret; 788971fcd49SLan Tianyu 789971fcd49SLan Tianyu if (set) 790971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 791971fcd49SLan Tianyu else 792ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 793ad493e5eSLan Tianyu 794d5c3834eSDan Williams if (ret) 795971fcd49SLan Tianyu return ret; 796d5c3834eSDan Williams 797d5c3834eSDan Williams if (set) 798d5c3834eSDan Williams set_bit(port1, hub->power_bits); 799d5c3834eSDan Williams else 800d5c3834eSDan Williams clear_bit(port1, hub->power_bits); 801d5c3834eSDan Williams return 0; 802971fcd49SLan Tianyu } 803971fcd49SLan Tianyu 804971fcd49SLan Tianyu /** 805cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 806cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 8071da177e4SLinus Torvalds * 8081da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 8091da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 8101da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 8111da177e4SLinus Torvalds * interrupt context. 8121da177e4SLinus Torvalds * 8131da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 8141da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 815626f090cSYacine Belkadi * 816626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 8171da177e4SLinus Torvalds */ 818cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 8191da177e4SLinus Torvalds { 820cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 821cb88a1b8SAlan Stern int pipe = urb->pipe; 8221da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 8231da177e4SLinus Torvalds unsigned long flags; 8241da177e4SLinus Torvalds struct usb_tt_clear *clear; 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 8271da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 8281da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 8291da177e4SLinus Torvalds */ 830d544d273SGreg Kroah-Hartman clear = kmalloc(sizeof *clear, GFP_ATOMIC); 831d544d273SGreg Kroah-Hartman if (clear == NULL) { 8321da177e4SLinus Torvalds dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 8331da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 834cb88a1b8SAlan Stern return -ENOMEM; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 8381da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 8391da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 8401da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 8411da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol(pipe) 8421da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 8431da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 8441da177e4SLinus Torvalds if (usb_pipein(pipe)) 8451da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 8461da177e4SLinus Torvalds 847cb88a1b8SAlan Stern /* info for completion callback */ 848cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 849cb88a1b8SAlan Stern clear->ep = urb->ep; 850cb88a1b8SAlan Stern 8511da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 8521da177e4SLinus Torvalds spin_lock_irqsave(&tt->lock, flags); 8531da177e4SLinus Torvalds list_add_tail(&clear->clear_list, &tt->clear_list); 854cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 8551da177e4SLinus Torvalds spin_unlock_irqrestore(&tt->lock, flags); 856cb88a1b8SAlan Stern return 0; 8571da177e4SLinus Torvalds } 858cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8591da177e4SLinus Torvalds 8607ad3c470SDan Williams static void hub_power_on(struct usb_hub *hub, bool do_delay) 8611da177e4SLinus Torvalds { 8621da177e4SLinus Torvalds int port1; 8631da177e4SLinus Torvalds 8644489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8654489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8664489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8674489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8684489a571SAlan Stern * unless we send these messages to the hub. 8694489a571SAlan Stern */ 8709262c19dSDan Williams if (hub_is_port_power_switchable(hub)) 8711da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8724489a571SAlan Stern else 8734489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8744489a571SAlan Stern "non-switchable hub\n"); 8753bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 876d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 8774489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 878ad493e5eSLan Tianyu else 879ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 880ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8818520f380SAlan Stern if (do_delay) 8827ad3c470SDan Williams msleep(hub_power_on_good_delay(hub)); 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds 8851da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8861da177e4SLinus Torvalds u16 *status, u16 *change) 8871da177e4SLinus Torvalds { 8881da177e4SLinus Torvalds int ret; 8891da177e4SLinus Torvalds 890db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8911da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 892e9e88fb7SAlan Stern if (ret < 0) { 893e9e88fb7SAlan Stern if (ret != -ENODEV) 8941da177e4SLinus Torvalds dev_err(hub->intfdev, 895441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 896e9e88fb7SAlan Stern } else { 8971da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8981da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8991da177e4SLinus Torvalds ret = 0; 9001da177e4SLinus Torvalds } 901db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 9021da177e4SLinus Torvalds return ret; 9031da177e4SLinus Torvalds } 9041da177e4SLinus Torvalds 90541e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 90641e7e056SSarah Sharp unsigned int link_status) 90741e7e056SSarah Sharp { 90841e7e056SSarah Sharp return set_port_feature(hub->hdev, 90941e7e056SSarah Sharp port1 | (link_status << 3), 91041e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 91141e7e056SSarah Sharp } 91241e7e056SSarah Sharp 91341e7e056SSarah Sharp /* 9146d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 91537ebb549SPetr Mladek * time later hub_wq will disconnect() any existing usb_device on the port 9160458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9170458d5b4SAlan Stern */ 9180458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9197d069b7dSAlan Stern { 920d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); 9210458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9220458d5b4SAlan Stern 9230458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9240458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9250458d5b4SAlan Stern * - SRP saves power that way 9260458d5b4SAlan Stern * - ... new call, TBD ... 9270458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 92837ebb549SPetr Mladek * hub_wq reactivates the port later (timer, SRP, etc). 9290458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9300458d5b4SAlan Stern */ 9310458d5b4SAlan Stern 9320458d5b4SAlan Stern set_bit(port1, hub->change_bits); 93332a69589SPetr Mladek kick_hub_wq(hub); 9340458d5b4SAlan Stern } 9350458d5b4SAlan Stern 936253e0572SAlan Stern /** 937253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 938253e0572SAlan Stern * @udev: device to be disabled and removed 939253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 940253e0572SAlan Stern * 94137ebb549SPetr Mladek * After @udev's port has been disabled, hub_wq is notified and it will 942253e0572SAlan Stern * see that the device has been disconnected. When the device is 943253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 944253e0572SAlan Stern * be received and processed normally. 945626f090cSYacine Belkadi * 946626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 947253e0572SAlan Stern */ 948253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 949253e0572SAlan Stern { 950253e0572SAlan Stern struct usb_hub *hub; 951253e0572SAlan Stern struct usb_interface *intf; 952253e0572SAlan Stern 953253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 954253e0572SAlan Stern return -EINVAL; 955ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 956253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 957253e0572SAlan Stern 958253e0572SAlan Stern usb_autopm_get_interface(intf); 959253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 960253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 961253e0572SAlan Stern usb_autopm_put_interface(intf); 962253e0572SAlan Stern return 0; 963253e0572SAlan Stern } 964253e0572SAlan Stern 9656ee0b270SAlan Stern enum hub_activation_type { 9668e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9678520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9686ee0b270SAlan Stern }; 9695e6effaeSAlan Stern 9708520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 9718520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 9728520f380SAlan Stern 973f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 9745e6effaeSAlan Stern { 9755e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 976653a39d1SSarah Sharp struct usb_hcd *hcd; 977653a39d1SSarah Sharp int ret; 9785e6effaeSAlan Stern int port1; 979f2835219SAlan Stern int status; 980948fea37SAlan Stern bool need_debounce_delay = false; 9818520f380SAlan Stern unsigned delay; 9828520f380SAlan Stern 9838520f380SAlan Stern /* Continue a partial initialization */ 984e50293efSAlan Stern if (type == HUB_INIT2 || type == HUB_INIT3) { 98507d316a2SAlan Stern device_lock(&hdev->dev); 986e50293efSAlan Stern 987e50293efSAlan Stern /* Was the hub disconnected while we were waiting? */ 988ca5cbc8bSAlan Stern if (hub->disconnected) 989ca5cbc8bSAlan Stern goto disconnected; 9908520f380SAlan Stern if (type == HUB_INIT2) 9918520f380SAlan Stern goto init2; 9928520f380SAlan Stern goto init3; 993e50293efSAlan Stern } 994e50293efSAlan Stern kref_get(&hub->kref); 9955e6effaeSAlan Stern 996a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 997a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 998a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 999a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1000a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1001a45aa3b3SElric Fu * reset procedure. 1002a45aa3b3SElric Fu * 1003a45aa3b3SElric Fu * After a resume, port power should still be on. 1004f2835219SAlan Stern * For any other type of activation, turn it on. 1005f2835219SAlan Stern */ 10068520f380SAlan Stern if (type != HUB_RESUME) { 1007a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1008a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1009a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1010a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1011a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1012a45aa3b3SElric Fu if (ret < 0) 1013a45aa3b3SElric Fu dev_err(hub->intfdev, 1014a45aa3b3SElric Fu "set hub depth failed\n"); 1015a45aa3b3SElric Fu } 10168520f380SAlan Stern 10178520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10188520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10198520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10208520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10218520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10228520f380SAlan Stern * rather than as a module). It adds up. 10238520f380SAlan Stern * 10248520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10258520f380SAlan Stern * because for those activation types the ports have to be 10268520f380SAlan Stern * operational when we return. In theory this could be done 10278520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10288520f380SAlan Stern */ 10298520f380SAlan Stern if (type == HUB_INIT) { 103017a364e2SKris Borer delay = hub_power_on_good_delay(hub); 10317ad3c470SDan Williams 10327ad3c470SDan Williams hub_power_on(hub, false); 103377fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); 103422f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 103522f6a0f0SShaibal Dutta &hub->init_work, 10368520f380SAlan Stern msecs_to_jiffies(delay)); 103761fbeba1SAlan Stern 103861fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10398e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10408e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10418520f380SAlan Stern return; /* Continues at init2: below */ 1042653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1043653a39d1SSarah Sharp /* The internal host controller state for the hub device 1044653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1045653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1046653a39d1SSarah Sharp */ 1047653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1048653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1049653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1050653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1051653a39d1SSarah Sharp if (ret < 0) { 1052653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1053653a39d1SSarah Sharp "accepting hub info " 1054653a39d1SSarah Sharp "update.\n"); 1055653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1056653a39d1SSarah Sharp "and hubs may not work " 1057653a39d1SSarah Sharp "under this hub\n."); 1058653a39d1SSarah Sharp } 1059653a39d1SSarah Sharp } 1060653a39d1SSarah Sharp hub_power_on(hub, true); 10618520f380SAlan Stern } else { 10628520f380SAlan Stern hub_power_on(hub, true); 10638520f380SAlan Stern } 10648520f380SAlan Stern } 10658520f380SAlan Stern init2: 1066f2835219SAlan Stern 1067d99f6b41SDan Williams /* 106837ebb549SPetr Mladek * Check each port and set hub->change_bits to let hub_wq know 10696ee0b270SAlan Stern * which ports need attention. 10705e6effaeSAlan Stern */ 10715e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1072d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 1073d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 10745e6effaeSAlan Stern u16 portstatus, portchange; 10755e6effaeSAlan Stern 10766ee0b270SAlan Stern portstatus = portchange = 0; 10776ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 1078245b2eecSGuenter Roeck if (status) 1079245b2eecSGuenter Roeck goto abort; 1080245b2eecSGuenter Roeck 10816ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 1082d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x change %04x\n", 1083d99f6b41SDan Williams portstatus, portchange); 10845e6effaeSAlan Stern 1085d99f6b41SDan Williams /* 1086d99f6b41SDan Williams * After anything other than HUB_RESUME (i.e., initialization 10876ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 10886ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 10896ee0b270SAlan Stern * and so should ports for which we have no usb_device. 10905e6effaeSAlan Stern */ 10916ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 10926ee0b270SAlan Stern type != HUB_RESUME || 10936ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 10946ee0b270SAlan Stern !udev || 10956ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 10969f0a6cd3SAndiry Xu /* 10979f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 10989f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1099fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1100fd1ac4cfSDan Williams * power was lost 11019f0a6cd3SAndiry Xu */ 1102fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1103fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1104ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11059f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11069f0a6cd3SAndiry Xu } 11076ee0b270SAlan Stern 1108948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1109948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1110948fea37SAlan Stern need_debounce_delay = true; 1111ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1112948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1113948fea37SAlan Stern } 1114948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1115948fea37SAlan Stern need_debounce_delay = true; 1116ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1117948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1118948fea37SAlan Stern } 1119e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1120e92aee33SJulius Werner need_debounce_delay = true; 1121e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1122e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1123e92aee33SJulius Werner } 112479c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 112579c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 112679c3dd81SDon Zickus need_debounce_delay = true; 1127ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 112879c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 112979c3dd81SDon Zickus } 1130253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1131253e0572SAlan Stern * physical disconnect or the connect status changes. 1132253e0572SAlan Stern */ 1133253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1134253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1135253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1136253e0572SAlan Stern 11376ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 113837ebb549SPetr Mladek /* Tell hub_wq to disconnect the device or 11396ee0b270SAlan Stern * check for a new connection 11406ee0b270SAlan Stern */ 114108d1dec6SShen Guang if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || 114208d1dec6SShen Guang (portstatus & USB_PORT_STAT_OVERCURRENT)) 11436ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11446ee0b270SAlan Stern 11456ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 114672937e1eSSarah Sharp bool port_resumed = (portstatus & 114772937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 114872937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11496ee0b270SAlan Stern /* The power session apparently survived the resume. 11506ee0b270SAlan Stern * If there was an overcurrent or suspend change 115137ebb549SPetr Mladek * (i.e., remote wakeup request), have hub_wq 115272937e1eSSarah Sharp * take care of it. Look at the port link state 115372937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 115472937e1eSSarah Sharp * change bit, and they don't set the port link change 115572937e1eSSarah Sharp * bit on device-initiated resume. 11566ee0b270SAlan Stern */ 115772937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 115872937e1eSSarah Sharp port_resumed)) 11596ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11606ee0b270SAlan Stern 11616ee0b270SAlan Stern } else if (udev->persist_enabled) { 11626ee0b270SAlan Stern #ifdef CONFIG_PM 11635e6effaeSAlan Stern udev->reset_resume = 1; 11646ee0b270SAlan Stern #endif 1165ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1166ad493e5eSLan Tianyu * was powered off. 1167ad493e5eSLan Tianyu */ 1168d5c3834eSDan Williams if (test_bit(port1, hub->power_bits)) 11698808f00cSAlan Stern set_bit(port1, hub->change_bits); 11708808f00cSAlan Stern 11716ee0b270SAlan Stern } else { 117237ebb549SPetr Mladek /* The power session is gone; tell hub_wq */ 11736ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11746ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11755e6effaeSAlan Stern } 11765e6effaeSAlan Stern } 11775e6effaeSAlan Stern 1178948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1179948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 118037ebb549SPetr Mladek * ports all at once right now, instead of letting hub_wq do them 1181948fea37SAlan Stern * one at a time later on. 1182948fea37SAlan Stern * 118337ebb549SPetr Mladek * If any port-status changes do occur during this delay, hub_wq 1184948fea37SAlan Stern * will see them later and handle them normally. 1185948fea37SAlan Stern */ 11868520f380SAlan Stern if (need_debounce_delay) { 11878520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1188f2835219SAlan Stern 11898520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 11908520f380SAlan Stern if (type == HUB_INIT2) { 119177fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); 119222f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 119322f6a0f0SShaibal Dutta &hub->init_work, 11948520f380SAlan Stern msecs_to_jiffies(delay)); 119507d316a2SAlan Stern device_unlock(&hdev->dev); 11968520f380SAlan Stern return; /* Continues at init3: below */ 11978520f380SAlan Stern } else { 11988520f380SAlan Stern msleep(delay); 11998520f380SAlan Stern } 12008520f380SAlan Stern } 12018520f380SAlan Stern init3: 1202f2835219SAlan Stern hub->quiescing = 0; 1203f2835219SAlan Stern 1204f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1205f2835219SAlan Stern if (status < 0) 1206f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1207f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 120822f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 120922f6a0f0SShaibal Dutta &hub->leds, LED_CYCLE_PERIOD); 1210f2835219SAlan Stern 1211f2835219SAlan Stern /* Scan all ports that need attention */ 121232a69589SPetr Mladek kick_hub_wq(hub); 1213245b2eecSGuenter Roeck abort: 1214ca5cbc8bSAlan Stern if (type == HUB_INIT2 || type == HUB_INIT3) { 12158e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 1216ca5cbc8bSAlan Stern disconnected: 12178e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 121807d316a2SAlan Stern device_unlock(&hdev->dev); 1219ca5cbc8bSAlan Stern } 1220e50293efSAlan Stern 1221e50293efSAlan Stern kref_put(&hub->kref, hub_release); 12225e6effaeSAlan Stern } 12235e6effaeSAlan Stern 12248520f380SAlan Stern /* Implement the continuations for the delays above */ 12258520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12268520f380SAlan Stern { 12278520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12288520f380SAlan Stern 12298520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12308520f380SAlan Stern } 12318520f380SAlan Stern 12328520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12338520f380SAlan Stern { 12348520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12358520f380SAlan Stern 12368520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12378520f380SAlan Stern } 12388520f380SAlan Stern 12394330354fSAlan Stern enum hub_quiescing_type { 12404330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12414330354fSAlan Stern }; 12424330354fSAlan Stern 12434330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12444330354fSAlan Stern { 12454330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12464330354fSAlan Stern int i; 12474330354fSAlan Stern 124837ebb549SPetr Mladek /* hub_wq and related activity won't re-trigger */ 12494330354fSAlan Stern hub->quiescing = 1; 12504330354fSAlan Stern 12514330354fSAlan Stern if (type != HUB_SUSPEND) { 12524330354fSAlan Stern /* Disconnect all the children */ 12534330354fSAlan Stern for (i = 0; i < hdev->maxchild; ++i) { 1254ff823c79SLan Tianyu if (hub->ports[i]->child) 1255ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 12564330354fSAlan Stern } 12574330354fSAlan Stern } 12584330354fSAlan Stern 125937ebb549SPetr Mladek /* Stop hub_wq and related activity */ 12604330354fSAlan Stern usb_kill_urb(hub->urb); 12614330354fSAlan Stern if (hub->has_indicators) 12624330354fSAlan Stern cancel_delayed_work_sync(&hub->leds); 12634330354fSAlan Stern if (hub->tt.hub) 1264036546bfSOctavian Purdila flush_work(&hub->tt.clear_work); 12654330354fSAlan Stern } 12664330354fSAlan Stern 1267600856c2SAlan Stern static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) 1268600856c2SAlan Stern { 1269600856c2SAlan Stern int i; 1270600856c2SAlan Stern 1271600856c2SAlan Stern for (i = 0; i < hub->hdev->maxchild; ++i) 1272600856c2SAlan Stern pm_runtime_barrier(&hub->ports[i]->dev); 1273600856c2SAlan Stern } 1274600856c2SAlan Stern 12753eb14915SAlan Stern /* caller has locked the hub device */ 12763eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12773eb14915SAlan Stern { 12783eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12793eb14915SAlan Stern 12804330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1281600856c2SAlan Stern hub->in_reset = 1; 1282600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1283f07600cfSAlan Stern return 0; 12847d069b7dSAlan Stern } 12857d069b7dSAlan Stern 12867d069b7dSAlan Stern /* caller has locked the hub device */ 1287f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12887d069b7dSAlan Stern { 12897de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12907de18d8bSAlan Stern 1291600856c2SAlan Stern hub->in_reset = 0; 1292600856c2SAlan Stern hub_pm_barrier_for_all_ports(hub); 1293f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1294f07600cfSAlan Stern return 0; 12957d069b7dSAlan Stern } 12967d069b7dSAlan Stern 12971da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 12981da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 12991da177e4SLinus Torvalds { 1300b356b7c7SSarah Sharp struct usb_hcd *hcd; 13011da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 13021da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 13031da177e4SLinus Torvalds u16 hubstatus, hubchange; 130474ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 13051da177e4SLinus Torvalds unsigned int pipe; 1306fa2a9566SLan Tianyu int maxp, ret, i; 13077cbe5dcaSAlan Stern char *message = "out of memory"; 1308430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1309430ee58eSSebastian Andrzej Siewior unsigned full_load; 1310d8521afeSDan Williams unsigned maxchild; 13111da177e4SLinus Torvalds 1312d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13131da177e4SLinus Torvalds if (!hub->buffer) { 13141da177e4SLinus Torvalds ret = -ENOMEM; 13151da177e4SLinus Torvalds goto fail; 13161da177e4SLinus Torvalds } 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13191da177e4SLinus Torvalds if (!hub->status) { 13201da177e4SLinus Torvalds ret = -ENOMEM; 13211da177e4SLinus Torvalds goto fail; 13221da177e4SLinus Torvalds } 1323db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13241da177e4SLinus Torvalds 1325bec444cdSJohan Hovold hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13261da177e4SLinus Torvalds if (!hub->descriptor) { 13271da177e4SLinus Torvalds ret = -ENOMEM; 13281da177e4SLinus Torvalds goto fail; 13291da177e4SLinus Torvalds } 13301da177e4SLinus Torvalds 13311da177e4SLinus Torvalds /* Request the entire hub descriptor. 13321da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13332c25a2c8SJohan Hovold * but a (non-SS) hub can/will return fewer bytes here. 13341da177e4SLinus Torvalds */ 1335dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13361da177e4SLinus Torvalds if (ret < 0) { 13371da177e4SLinus Torvalds message = "can't read hub descriptor"; 13381da177e4SLinus Torvalds goto fail; 133993491cedSJohan Hovold } 134093491cedSJohan Hovold 134193491cedSJohan Hovold maxchild = USB_MAXCHILDREN; 134293491cedSJohan Hovold if (hub_is_superspeed(hdev)) 134393491cedSJohan Hovold maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS); 134493491cedSJohan Hovold 134593491cedSJohan Hovold if (hub->descriptor->bNbrPorts > maxchild) { 13461da177e4SLinus Torvalds message = "hub has too many ports!"; 13471da177e4SLinus Torvalds ret = -ENODEV; 13481da177e4SLinus Torvalds goto fail; 1349769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1350769d7368SDavid Linares message = "hub doesn't have any ports!"; 1351769d7368SDavid Linares ret = -ENODEV; 1352769d7368SDavid Linares goto fail; 13531da177e4SLinus Torvalds } 13541da177e4SLinus Torvalds 1355d8521afeSDan Williams maxchild = hub->descriptor->bNbrPorts; 1356d8521afeSDan Williams dev_info(hub_dev, "%d port%s detected\n", maxchild, 1357d8521afeSDan Williams (maxchild == 1) ? "" : "s"); 13581da177e4SLinus Torvalds 1359d8521afeSDan Williams hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL); 1360ff823c79SLan Tianyu if (!hub->ports) { 13617cbe5dcaSAlan Stern ret = -ENOMEM; 13627cbe5dcaSAlan Stern goto fail; 13637cbe5dcaSAlan Stern } 13647cbe5dcaSAlan Stern 136574ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1366430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1367430ee58eSSebastian Andrzej Siewior unit_load = 150; 1368430ee58eSSebastian Andrzej Siewior full_load = 900; 1369430ee58eSSebastian Andrzej Siewior } else { 1370430ee58eSSebastian Andrzej Siewior unit_load = 100; 1371430ee58eSSebastian Andrzej Siewior full_load = 500; 1372430ee58eSSebastian Andrzej Siewior } 13731da177e4SLinus Torvalds 1374dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1375dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1376dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13771da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 13781da177e4SLinus Torvalds 1379d8521afeSDan Williams for (i = 0; i < maxchild; i++) 1380dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 13811da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 13821da177e4SLinus Torvalds ? 'F' : 'R'; 1383d8521afeSDan Williams portstr[maxchild] = 0; 13841da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 13851da177e4SLinus Torvalds } else 13861da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 13871da177e4SLinus Torvalds 138874ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 13897bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 13901da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 13911da177e4SLinus Torvalds break; 13927bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 13931da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 13941da177e4SLinus Torvalds break; 13957bf01185SAman Deep case HUB_CHAR_NO_LPSM: 13967bf01185SAman Deep case HUB_CHAR_LPSM: 13971da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 13981da177e4SLinus Torvalds break; 13991da177e4SLinus Torvalds } 14001da177e4SLinus Torvalds 140174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 14027bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 14031da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 14041da177e4SLinus Torvalds break; 14057bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 14061da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 14071da177e4SLinus Torvalds break; 14087bf01185SAman Deep case HUB_CHAR_NO_OCPM: 14097bf01185SAman Deep case HUB_CHAR_OCPM: 14101da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 14111da177e4SLinus Torvalds break; 14121da177e4SLinus Torvalds } 14131da177e4SLinus Torvalds 14141da177e4SLinus Torvalds spin_lock_init(&hub->tt.lock); 14151da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->tt.clear_list); 1416cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14171da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14187bf01185SAman Deep case USB_HUB_PR_FS: 14191da177e4SLinus Torvalds break; 14207bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14211da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14221da177e4SLinus Torvalds hub->tt.hub = hdev; 14231da177e4SLinus Torvalds break; 14247bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14251da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14261da177e4SLinus Torvalds if (ret == 0) { 14271da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14281da177e4SLinus Torvalds hub->tt.multi = 1; 14291da177e4SLinus Torvalds } else 14301da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14311da177e4SLinus Torvalds ret); 14321da177e4SLinus Torvalds hub->tt.hub = hdev; 14331da177e4SLinus Torvalds break; 14347bf01185SAman Deep case USB_HUB_PR_SS: 1435d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1436d2e9b4d6SSarah Sharp break; 14371da177e4SLinus Torvalds default: 14381da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14391da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14401da177e4SLinus Torvalds break; 14411da177e4SLinus Torvalds } 14421da177e4SLinus Torvalds 1443e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 144474ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1445e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1446e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1447e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1448e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1449e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1450e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1451e09711aeSdavid-b@pacbell.net } 14521da177e4SLinus Torvalds break; 1453e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1454e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1455e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1456e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1457e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14581da177e4SLinus Torvalds break; 1459e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1460e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1461e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1462e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1463e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14641da177e4SLinus Torvalds break; 1465e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1466e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1467e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1468e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1469e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14701da177e4SLinus Torvalds break; 14711da177e4SLinus Torvalds } 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 147474ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14751da177e4SLinus Torvalds hub->has_indicators = 1; 14761da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14771da177e4SLinus Torvalds } 14781da177e4SLinus Torvalds 14791da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 14801da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 14811da177e4SLinus Torvalds 14821da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 14831da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 14841da177e4SLinus Torvalds */ 14851da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 148615b7336eSAlan Stern if (ret) { 14871da177e4SLinus Torvalds message = "can't get hub status"; 14881da177e4SLinus Torvalds goto fail; 14891da177e4SLinus Torvalds } 1490430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 14917d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1492430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1493430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1494430ee58eSSebastian Andrzej Siewior else 1495d8521afeSDan Williams hdev->bus_mA = full_load * maxchild; 1496430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1497430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 149855c52718SAlan Stern else { 149955c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 150055c52718SAlan Stern hub->limited_power = 1; 150155c52718SAlan Stern } 15027d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 150355c52718SAlan Stern int remaining = hdev->bus_mA - 150455c52718SAlan Stern hub->descriptor->bHubContrCurrent; 15051da177e4SLinus Torvalds 1506430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1507430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1508430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1509430ee58eSSebastian Andrzej Siewior 1510d8521afeSDan Williams if (remaining < maxchild * unit_load) 151155c52718SAlan Stern dev_warn(hub_dev, 151255c52718SAlan Stern "insufficient power available " 151355c52718SAlan Stern "to use all downstream ports\n"); 1514430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1515430ee58eSSebastian Andrzej Siewior 151655c52718SAlan Stern } else { /* Self-powered external hub */ 151755c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 151855c52718SAlan Stern * provide less current per port? */ 1519430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 152055c52718SAlan Stern } 1521430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 152255c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 152355c52718SAlan Stern hub->mA_per_port); 15241da177e4SLinus Torvalds 15251da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15261da177e4SLinus Torvalds if (ret < 0) { 15271da177e4SLinus Torvalds message = "can't get hub status"; 15281da177e4SLinus Torvalds goto fail; 15291da177e4SLinus Torvalds } 15301da177e4SLinus Torvalds 15311da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15321da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15331da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15341da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15351da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15361da177e4SLinus Torvalds 153774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15381da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15391da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15401da177e4SLinus Torvalds 154188fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 154288fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 154388fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 154488fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 154588fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 154688fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15471da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15481da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15491da177e4SLinus Torvalds 15501da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15511da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15521da177e4SLinus Torvalds 15531da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15541da177e4SLinus Torvalds if (!hub->urb) { 15551da177e4SLinus Torvalds ret = -ENOMEM; 15561da177e4SLinus Torvalds goto fail; 15571da177e4SLinus Torvalds } 15581da177e4SLinus Torvalds 15591da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15601da177e4SLinus Torvalds hub, endpoint->bInterval); 15611da177e4SLinus Torvalds 15621da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15631da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15641da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 15651da177e4SLinus Torvalds 1566d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1567d8521afeSDan Williams for (i = 0; i < maxchild; i++) { 1568e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1569e58547ebSKrzysztof Mazur if (ret < 0) { 1570fa2a9566SLan Tianyu dev_err(hub->intfdev, 1571fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1572d8521afeSDan Williams break; 1573d8521afeSDan Williams } 1574d8521afeSDan Williams } 1575e58547ebSKrzysztof Mazur hdev->maxchild = i; 1576e3d10505SDan Williams for (i = 0; i < hdev->maxchild; i++) { 1577e3d10505SDan Williams struct usb_port *port_dev = hub->ports[i]; 1578e3d10505SDan Williams 1579e3d10505SDan Williams pm_runtime_put(&port_dev->dev); 1580e3d10505SDan Williams } 1581e3d10505SDan Williams 1582d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1583d8521afeSDan Williams if (ret < 0) 1584d8521afeSDan Williams goto fail; 1585fa2a9566SLan Tianyu 158637ebb549SPetr Mladek /* Update the HCD's internal representation of this hub before hub_wq 1587e3d95580SDan Williams * starts getting port status changes for devices under the hub. 1588e3d95580SDan Williams */ 1589e3d95580SDan Williams if (hcd->driver->update_hub_device) { 1590e3d95580SDan Williams ret = hcd->driver->update_hub_device(hcd, hdev, 1591e3d95580SDan Williams &hub->tt, GFP_KERNEL); 1592e3d95580SDan Williams if (ret < 0) { 1593e3d95580SDan Williams message = "can't update HCD hub info"; 1594e3d95580SDan Williams goto fail; 1595e3d95580SDan Williams } 1596e3d95580SDan Williams } 1597e3d95580SDan Williams 1598d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1599d2123fd9SLan Tianyu 1600f2835219SAlan Stern hub_activate(hub, HUB_INIT); 16011da177e4SLinus Torvalds return 0; 16021da177e4SLinus Torvalds 16031da177e4SLinus Torvalds fail: 16041da177e4SLinus Torvalds dev_err(hub_dev, "config failed, %s (err %d)\n", 16051da177e4SLinus Torvalds message, ret); 16061da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 16071da177e4SLinus Torvalds return ret; 16081da177e4SLinus Torvalds } 16091da177e4SLinus Torvalds 1610e8054854SAlan Stern static void hub_release(struct kref *kref) 1611e8054854SAlan Stern { 1612e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1613e8054854SAlan Stern 16145d14f323SPetr Mladek usb_put_dev(hub->hdev); 1615e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1616e8054854SAlan Stern kfree(hub); 1617e8054854SAlan Stern } 1618e8054854SAlan Stern 16191da177e4SLinus Torvalds static unsigned highspeed_hubs; 16201da177e4SLinus Torvalds 16211da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 16221da177e4SLinus Torvalds { 16231da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1624fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1625543d7784SAlan Stern int port1; 1626fa2a9566SLan Tianyu 162732a69589SPetr Mladek /* 162832a69589SPetr Mladek * Stop adding new hub events. We do not want to block here and thus 162932a69589SPetr Mladek * will not try to remove any pending work item. 163032a69589SPetr Mladek */ 1631e8054854SAlan Stern hub->disconnected = 1; 16321da177e4SLinus Torvalds 16337de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16347de18d8bSAlan Stern hub->error = 0; 16354330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16367de18d8bSAlan Stern 1637d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 1638d8521afeSDan Williams 1639543d7784SAlan Stern /* Avoid races with recursively_mark_NOTATTACHED() */ 1640543d7784SAlan Stern spin_lock_irq(&device_state_lock); 1641543d7784SAlan Stern port1 = hdev->maxchild; 1642543d7784SAlan Stern hdev->maxchild = 0; 16438b28c752SAlan Stern usb_set_intfdata(intf, NULL); 1644543d7784SAlan Stern spin_unlock_irq(&device_state_lock); 16451f2235b8SAlexander Shishkin 1646543d7784SAlan Stern for (; port1 > 0; --port1) 1647543d7784SAlan Stern usb_hub_remove_port_device(hub, port1); 16481da177e4SLinus Torvalds 1649d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 1650d8521afeSDan Williams 1651e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16521da177e4SLinus Torvalds highspeed_hubs--; 16531da177e4SLinus Torvalds 16541da177e4SLinus Torvalds usb_free_urb(hub->urb); 1655fa2a9566SLan Tianyu kfree(hub->ports); 16561da177e4SLinus Torvalds kfree(hub->descriptor); 16571da177e4SLinus Torvalds kfree(hub->status); 1658d697cddaSAlan Stern kfree(hub->buffer); 16591da177e4SLinus Torvalds 1660971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1661e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16621da177e4SLinus Torvalds } 16631da177e4SLinus Torvalds 1664c94dc34fSEugene Korenevsky static bool hub_descriptor_is_sane(struct usb_host_interface *desc) 1665c94dc34fSEugene Korenevsky { 1666c94dc34fSEugene Korenevsky /* Some hubs have a subclass of 1, which AFAICT according to the */ 1667c94dc34fSEugene Korenevsky /* specs is not defined, but it works */ 1668c94dc34fSEugene Korenevsky if (desc->desc.bInterfaceSubClass != 0 && 1669c94dc34fSEugene Korenevsky desc->desc.bInterfaceSubClass != 1) 1670c94dc34fSEugene Korenevsky return false; 1671c94dc34fSEugene Korenevsky 1672c94dc34fSEugene Korenevsky /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 1673c94dc34fSEugene Korenevsky if (desc->desc.bNumEndpoints != 1) 1674c94dc34fSEugene Korenevsky return false; 1675c94dc34fSEugene Korenevsky 1676c94dc34fSEugene Korenevsky /* If the first endpoint is not interrupt IN, we'd better punt! */ 1677c94dc34fSEugene Korenevsky if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) 1678c94dc34fSEugene Korenevsky return false; 1679c94dc34fSEugene Korenevsky 1680c94dc34fSEugene Korenevsky return true; 1681c94dc34fSEugene Korenevsky } 1682c94dc34fSEugene Korenevsky 16831da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16841da177e4SLinus Torvalds { 16851da177e4SLinus Torvalds struct usb_host_interface *desc; 16861da177e4SLinus Torvalds struct usb_device *hdev; 16871da177e4SLinus Torvalds struct usb_hub *hub; 16881da177e4SLinus Torvalds 16891da177e4SLinus Torvalds desc = intf->cur_altsetting; 16901da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 16911da177e4SLinus Torvalds 1692596d789aSMing Lei /* 1693596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1694596d789aSMing Lei * based on the below considerations: 1695596d789aSMing Lei * 1696596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1697596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1698596d789aSMing Lei * event, and the submitted status URB is just to check future 1699596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1700596d789aSMing Lei * 1701596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1702596d789aSMing Lei * below very rare devices when they are plugged into hub 1703596d789aSMing Lei * first time: 1704596d789aSMing Lei * 1705596d789aSMing Lei * devices having trouble initializing, and disconnect 1706596d789aSMing Lei * themselves from the bus and then reconnect a second 1707596d789aSMing Lei * or so later 1708596d789aSMing Lei * 1709596d789aSMing Lei * devices just for downloading firmware, and disconnects 1710596d789aSMing Lei * themselves after completing it 1711596d789aSMing Lei * 1712596d789aSMing Lei * For these quite rare devices, their drivers may change the 1713596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1714596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1715596d789aSMing Lei * does care it. 1716596d789aSMing Lei * 1717596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1718596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1719596d789aSMing Lei * infrequent to worry about. 1720596d789aSMing Lei * 1721596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1722596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1723596d789aSMing Lei * of USB bus. 1724bdd405d2SRoger Quadros * 1725bdd405d2SRoger Quadros * - If user has indicated to prevent autosuspend by passing 1726bdd405d2SRoger Quadros * usbcore.autosuspend = -1 then keep autosuspend disabled. 1727596d789aSMing Lei */ 1728ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 1729bdd405d2SRoger Quadros if (hdev->dev.power.autosuspend_delay >= 0) 1730596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1731a9ef803dSGreg Kroah-Hartman #endif 1732596d789aSMing Lei 17338ef42dddSAlan Stern /* 17348ef42dddSAlan Stern * Hubs have proper suspend/resume support, except for root hubs 17358ef42dddSAlan Stern * where the controller driver doesn't have bus_suspend and 17368ef42dddSAlan Stern * bus_resume methods. 17378ef42dddSAlan Stern */ 17388ef42dddSAlan Stern if (hdev->parent) { /* normal device */ 1739088f7fecSAlan Stern usb_enable_autosuspend(hdev); 17408ef42dddSAlan Stern } else { /* root hub */ 17418ef42dddSAlan Stern const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; 17428ef42dddSAlan Stern 17438ef42dddSAlan Stern if (drv->bus_suspend && drv->bus_resume) 17448ef42dddSAlan Stern usb_enable_autosuspend(hdev); 17458ef42dddSAlan Stern } 1746088f7fecSAlan Stern 174738f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1748b9cef6c3SWu Fengguang dev_err(&intf->dev, 1749b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 175038f3ad5eSFelipe Balbi return -E2BIG; 175138f3ad5eSFelipe Balbi } 175238f3ad5eSFelipe Balbi 175389ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 175489ccbdc9SDavid Brownell if (hdev->parent) { 175589ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 175689ccbdc9SDavid Brownell return -ENODEV; 175789ccbdc9SDavid Brownell } 175889ccbdc9SDavid Brownell #endif 175989ccbdc9SDavid Brownell 1760c94dc34fSEugene Korenevsky if (!hub_descriptor_is_sane(desc)) { 17611da177e4SLinus Torvalds dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); 17621da177e4SLinus Torvalds return -EIO; 17631da177e4SLinus Torvalds } 17641da177e4SLinus Torvalds 17651da177e4SLinus Torvalds /* We found a hub */ 17661da177e4SLinus Torvalds dev_info(&intf->dev, "USB hub found\n"); 17671da177e4SLinus Torvalds 17680a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 1769b74e7062SWolfram Sang if (!hub) 17701da177e4SLinus Torvalds return -ENOMEM; 17711da177e4SLinus Torvalds 1772e8054854SAlan Stern kref_init(&hub->kref); 17731da177e4SLinus Torvalds hub->intfdev = &intf->dev; 17741da177e4SLinus Torvalds hub->hdev = hdev; 1775c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17768520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 177732a69589SPetr Mladek INIT_WORK(&hub->events, hub_event); 1778e8054854SAlan Stern usb_get_intf(intf); 17795d14f323SPetr Mladek usb_get_dev(hdev); 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds usb_set_intfdata(intf, hub); 178240f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1783971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 17841da177e4SLinus Torvalds 17851da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 17861da177e4SLinus Torvalds highspeed_hubs++; 17871da177e4SLinus Torvalds 1788e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1789e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1790e6f30deaSMing Lei 1791c94dc34fSEugene Korenevsky if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) 17921da177e4SLinus Torvalds return 0; 17931da177e4SLinus Torvalds 17941da177e4SLinus Torvalds hub_disconnect(intf); 17951da177e4SLinus Torvalds return -ENODEV; 17961da177e4SLinus Torvalds } 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds static int 17991da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 18001da177e4SLinus Torvalds { 18011da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev(intf); 1802ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18031da177e4SLinus Torvalds 18041da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 18051da177e4SLinus Torvalds switch (code) { 18061da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 18071da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 18081da177e4SLinus Torvalds int i; 18091da177e4SLinus Torvalds 18101da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 18111da177e4SLinus Torvalds if (hdev->devnum <= 0) 18121da177e4SLinus Torvalds info->nports = 0; 18131da177e4SLinus Torvalds else { 18141da177e4SLinus Torvalds info->nports = hdev->maxchild; 18151da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1816ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 18171da177e4SLinus Torvalds info->port[i] = 0; 18181da177e4SLinus Torvalds else 18191da177e4SLinus Torvalds info->port[i] = 1820ff823c79SLan Tianyu hub->ports[i]->child->devnum; 18211da177e4SLinus Torvalds } 18221da177e4SLinus Torvalds } 18231da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 18241da177e4SLinus Torvalds 18251da177e4SLinus Torvalds return info->nports + 1; 18261da177e4SLinus Torvalds } 18271da177e4SLinus Torvalds 18281da177e4SLinus Torvalds default: 18291da177e4SLinus Torvalds return -ENOSYS; 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds } 18321da177e4SLinus Torvalds 18337cbe5dcaSAlan Stern /* 18347cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 18357cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 18367cbe5dcaSAlan Stern */ 18377cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 18389b6f0c4bSValentina Manea struct usb_dev_state ***ppowner) 18397cbe5dcaSAlan Stern { 184041341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 184141341261SMathias Nyman 18427cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 18437cbe5dcaSAlan Stern return -ENODEV; 18447cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 18457cbe5dcaSAlan Stern return -EINVAL; 18467cbe5dcaSAlan Stern 184741341261SMathias Nyman /* Devices not managed by the hub driver 18487cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18497cbe5dcaSAlan Stern */ 185041341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18517cbe5dcaSAlan Stern return 0; 18527cbe5dcaSAlan Stern } 18537cbe5dcaSAlan Stern 18547cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1855336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 18569b6f0c4bSValentina Manea struct usb_dev_state *owner) 18577cbe5dcaSAlan Stern { 18587cbe5dcaSAlan Stern int rc; 18599b6f0c4bSValentina Manea struct usb_dev_state **powner; 18607cbe5dcaSAlan Stern 18617cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18627cbe5dcaSAlan Stern if (rc) 18637cbe5dcaSAlan Stern return rc; 18647cbe5dcaSAlan Stern if (*powner) 18657cbe5dcaSAlan Stern return -EBUSY; 18667cbe5dcaSAlan Stern *powner = owner; 18677cbe5dcaSAlan Stern return rc; 18687cbe5dcaSAlan Stern } 18696080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_claim_port); 18707cbe5dcaSAlan Stern 1871336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 18729b6f0c4bSValentina Manea struct usb_dev_state *owner) 18737cbe5dcaSAlan Stern { 18747cbe5dcaSAlan Stern int rc; 18759b6f0c4bSValentina Manea struct usb_dev_state **powner; 18767cbe5dcaSAlan Stern 18777cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18787cbe5dcaSAlan Stern if (rc) 18797cbe5dcaSAlan Stern return rc; 18807cbe5dcaSAlan Stern if (*powner != owner) 18817cbe5dcaSAlan Stern return -ENOENT; 18827cbe5dcaSAlan Stern *powner = NULL; 18837cbe5dcaSAlan Stern return rc; 18847cbe5dcaSAlan Stern } 18856080cd0eSValentina Manea EXPORT_SYMBOL_GPL(usb_hub_release_port); 18867cbe5dcaSAlan Stern 18879b6f0c4bSValentina Manea void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) 18887cbe5dcaSAlan Stern { 1889ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18907cbe5dcaSAlan Stern int n; 18917cbe5dcaSAlan Stern 1892fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1893fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1894fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 18957cbe5dcaSAlan Stern } 1896fa2a9566SLan Tianyu 18977cbe5dcaSAlan Stern } 18987cbe5dcaSAlan Stern 18997cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 19007cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 19017cbe5dcaSAlan Stern { 19027cbe5dcaSAlan Stern struct usb_hub *hub; 19037cbe5dcaSAlan Stern 19047cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 19057cbe5dcaSAlan Stern return false; 1906ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1907fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 19087cbe5dcaSAlan Stern } 19097cbe5dcaSAlan Stern 19101da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 19111da177e4SLinus Torvalds { 1912ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 19131da177e4SLinus Torvalds int i; 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1916ff823c79SLan Tianyu if (hub->ports[i]->child) 1917ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 19181da177e4SLinus Torvalds } 19199bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 192015123006SSarah Sharp udev->active_duration -= jiffies; 19211da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 19221da177e4SLinus Torvalds } 19231da177e4SLinus Torvalds 19241da177e4SLinus Torvalds /** 19251da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 19261da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 19271da177e4SLinus Torvalds * @new_state: new state value to be stored 19281da177e4SLinus Torvalds * 19291da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 19301da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 19311da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 19321da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 19331da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 19341da177e4SLinus Torvalds * all changes to any device's state must be protected by the 19351da177e4SLinus Torvalds * device_state_lock spinlock. 19361da177e4SLinus Torvalds * 19371da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 19381da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 19391da177e4SLinus Torvalds * 19401da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 19411da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 19421da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 19431da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 19441da177e4SLinus Torvalds */ 19451da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 19461da177e4SLinus Torvalds enum usb_device_state new_state) 19471da177e4SLinus Torvalds { 19481da177e4SLinus Torvalds unsigned long flags; 19494681b171SRafael J. Wysocki int wakeup = -1; 19501da177e4SLinus Torvalds 19511da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19521da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19531da177e4SLinus Torvalds ; /* do nothing */ 1954b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1955fb669cc0SDavid Brownell 1956fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1957fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1958fb669cc0SDavid Brownell */ 1959fb669cc0SDavid Brownell if (udev->parent) { 1960645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1961645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1962645daaabSAlan Stern ; /* No change to wakeup settings */ 1963645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 1964ddbe1fcaSLu Baolu wakeup = (udev->quirks & 1965ddbe1fcaSLu Baolu USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : 1966ddbe1fcaSLu Baolu udev->actconfig->desc.bmAttributes & 1967ddbe1fcaSLu Baolu USB_CONFIG_ATT_WAKEUP; 1968645daaabSAlan Stern else 19694681b171SRafael J. Wysocki wakeup = 0; 1970fb669cc0SDavid Brownell } 197115123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 197215123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 197315123006SSarah Sharp udev->active_duration -= jiffies; 197415123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 197515123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 197615123006SSarah Sharp udev->active_duration += jiffies; 1977645daaabSAlan Stern udev->state = new_state; 1978b94dc6b5SDavid Brownell } else 19791da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 19801da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 19814681b171SRafael J. Wysocki if (wakeup >= 0) 19824681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 19831da177e4SLinus Torvalds } 19846da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 19851da177e4SLinus Torvalds 19868af548dcSInaky Perez-Gonzalez /* 19873b29b68bSAlan Stern * Choose a device number. 19883b29b68bSAlan Stern * 19893b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 19903b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 19913b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 19923b29b68bSAlan Stern * and it usually is not the same as the device number. 19933b29b68bSAlan Stern * 19948af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 19958af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 19968af548dcSInaky Perez-Gonzalez * life of the device connection logic in 19978af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 19988af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 19998af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 20008af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 20018af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 20028af548dcSInaky Perez-Gonzalez * [X | 0x80]. 20038af548dcSInaky Perez-Gonzalez * 20048af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 20058af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 20068af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 20078af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 20088af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 2009c6515272SSarah Sharp * 2010c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 2011c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 2012c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 2013c6515272SSarah Sharp * command to the hardware. 20148af548dcSInaky Perez-Gonzalez */ 20153b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 20161da177e4SLinus Torvalds { 20171da177e4SLinus Torvalds int devnum; 20181da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 20191da177e4SLinus Torvalds 2020638139ebSPetr Mladek /* be safe when more hub events are proceed in parallel */ 2021feb26ac3SChris Bainbridge mutex_lock(&bus->devnum_next_mutex); 20228af548dcSInaky Perez-Gonzalez if (udev->wusb) { 20238af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 20248af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 20258af548dcSInaky Perez-Gonzalez } else { 20268af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 20278af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 20281da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 20291da177e4SLinus Torvalds bus->devnum_next); 20301da177e4SLinus Torvalds if (devnum >= 128) 20318af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 20328af548dcSInaky Perez-Gonzalez 128, 1); 20331da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 20348af548dcSInaky Perez-Gonzalez } 20351da177e4SLinus Torvalds if (devnum < 128) { 20361da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 20371da177e4SLinus Torvalds udev->devnum = devnum; 20381da177e4SLinus Torvalds } 2039feb26ac3SChris Bainbridge mutex_unlock(&bus->devnum_next_mutex); 20401da177e4SLinus Torvalds } 20411da177e4SLinus Torvalds 20423b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 20431da177e4SLinus Torvalds { 20441da177e4SLinus Torvalds if (udev->devnum > 0) { 20451da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 20461da177e4SLinus Torvalds udev->devnum = -1; 20471da177e4SLinus Torvalds } 20481da177e4SLinus Torvalds } 20491da177e4SLinus Torvalds 20503b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 20514953d141SDavid Vrabel { 20524953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20534953d141SDavid Vrabel if (!udev->wusb) 20544953d141SDavid Vrabel udev->devnum = devnum; 20554953d141SDavid Vrabel } 20564953d141SDavid Vrabel 2057f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2058f7410cedSHerbert Xu { 2059f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2060f7410cedSHerbert Xu 2061f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2062f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2063f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2064f7410cedSHerbert Xu } 2065f7410cedSHerbert Xu 20667027df36SDan Williams static void hub_disconnect_children(struct usb_device *udev) 20677027df36SDan Williams { 20687027df36SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20697027df36SDan Williams int i; 20707027df36SDan Williams 20717027df36SDan Williams /* Free up all the children before we remove this device */ 20727027df36SDan Williams for (i = 0; i < udev->maxchild; i++) { 20737027df36SDan Williams if (hub->ports[i]->child) 20747027df36SDan Williams usb_disconnect(&hub->ports[i]->child); 20757027df36SDan Williams } 20767027df36SDan Williams } 20777027df36SDan Williams 20781da177e4SLinus Torvalds /** 20791da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 20801da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 20811da177e4SLinus Torvalds * Context: !in_interrupt () 20821da177e4SLinus Torvalds * 20831da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 20841da177e4SLinus Torvalds * 20851da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2086a4b5d606SHeiner Kallweit * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, 2087db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 20881da177e4SLinus Torvalds * 20891da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 20901da177e4SLinus Torvalds * controllers) should ever call this. 20911da177e4SLinus Torvalds * 20921da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 20931da177e4SLinus Torvalds */ 20941da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 20951da177e4SLinus Torvalds { 20967027df36SDan Williams struct usb_port *port_dev = NULL; 20971da177e4SLinus Torvalds struct usb_device *udev = *pdev; 20985b1dc209SPeter Chen struct usb_hub *hub = NULL; 20995b1dc209SPeter Chen int port1 = 1; 21001da177e4SLinus Torvalds 21011da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 21021da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 210325985edcSLucas De Marchi * this quiesces everything except pending urbs. 21041da177e4SLinus Torvalds */ 21051da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 21063b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 21073b29b68bSAlan Stern udev->devnum); 21081da177e4SLinus Torvalds 2109f5cccf49SGuenter Roeck /* 2110f5cccf49SGuenter Roeck * Ensure that the pm runtime code knows that the USB device 2111f5cccf49SGuenter Roeck * is in the process of being disconnected. 2112f5cccf49SGuenter Roeck */ 2113f5cccf49SGuenter Roeck pm_runtime_barrier(&udev->dev); 2114f5cccf49SGuenter Roeck 21159ad3d6ccSAlan Stern usb_lock_device(udev); 21169ad3d6ccSAlan Stern 21177027df36SDan Williams hub_disconnect_children(udev); 21181da177e4SLinus Torvalds 21191da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 21201da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 21211da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 21221da177e4SLinus Torvalds */ 2123782da727SAlan Stern dev_dbg(&udev->dev, "unregistering device\n"); 21241da177e4SLinus Torvalds usb_disable_device(udev, 0); 2125cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 21261da177e4SLinus Torvalds 2127fde26380SLan Tianyu if (udev->parent) { 21287027df36SDan Williams port1 = udev->portnum; 21297027df36SDan Williams hub = usb_hub_to_struct_hub(udev->parent); 21307027df36SDan Williams port_dev = hub->ports[port1 - 1]; 2131fde26380SLan Tianyu 2132fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2133fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2134971fcd49SLan Tianyu 21357027df36SDan Williams /* 21367027df36SDan Williams * As usb_port_runtime_resume() de-references udev, make 21377027df36SDan Williams * sure no resumes occur during removal 21387027df36SDan Williams */ 21397027df36SDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 21407027df36SDan Williams pm_runtime_get_sync(&port_dev->dev); 2141fde26380SLan Tianyu } 2142fde26380SLan Tianyu 21433b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2144782da727SAlan Stern usb_unlock_device(udev); 21453099e75aSGreg Kroah-Hartman 2146782da727SAlan Stern /* Unregister the device. The device driver is responsible 21473b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 21483b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2149782da727SAlan Stern */ 2150782da727SAlan Stern device_del(&udev->dev); 2151782da727SAlan Stern 2152782da727SAlan Stern /* Free the device number and delete the parent's children[] 21531da177e4SLinus Torvalds * (or root_hub) pointer. 21541da177e4SLinus Torvalds */ 21553b29b68bSAlan Stern release_devnum(udev); 21561da177e4SLinus Torvalds 21571da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 21581da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 21591da177e4SLinus Torvalds *pdev = NULL; 21601da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 21611da177e4SLinus Torvalds 21627027df36SDan Williams if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) 21637027df36SDan Williams pm_runtime_put(&port_dev->dev); 21647027df36SDan Williams 2165f7410cedSHerbert Xu hub_free_dev(udev); 2166f7410cedSHerbert Xu 2167782da727SAlan Stern put_device(&udev->dev); 21681da177e4SLinus Torvalds } 21691da177e4SLinus Torvalds 2170f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 21711da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 21721da177e4SLinus Torvalds { 21731da177e4SLinus Torvalds if (!string) 21741da177e4SLinus Torvalds return; 2175f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 21761da177e4SLinus Torvalds } 21771da177e4SLinus Torvalds 2178f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2179f2a383e4SGreg Kroah-Hartman { 2180f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2181f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2182f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2183b9cef6c3SWu Fengguang dev_info(&udev->dev, 2184b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2185f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2186f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2187f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2188f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2189f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2190f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2191f2a383e4SGreg Kroah-Hartman } 21921da177e4SLinus Torvalds #else 2193f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 21941da177e4SLinus Torvalds #endif 21951da177e4SLinus Torvalds 21961da177e4SLinus Torvalds 21973ede760fSOliver Neukum /** 21988d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 21993ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 22003ede760fSOliver Neukum * 22018d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2202626f090cSYacine Belkadi * 2203626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 22043ede760fSOliver Neukum */ 22058d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 22061da177e4SLinus Torvalds { 2207d9d16e8aSInaky Perez-Gonzalez int err = 0; 22081da177e4SLinus Torvalds 22091da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 22101da177e4SLinus Torvalds /* 22111da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 22121da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 22131da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 22141da177e4SLinus Torvalds */ 22151da177e4SLinus Torvalds if (!udev->bus->is_b_host 22161da177e4SLinus Torvalds && udev->config 22171da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 22182eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 22191da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 222012c3da34SAlan Stern unsigned port1 = udev->portnum; 22211da177e4SLinus Torvalds 22227d2d641cSLi Jun /* descriptor may appear anywhere in config */ 22237d2d641cSLi Jun err = __usb_get_extra_descriptor(udev->rawdescriptors[0], 22247d2d641cSLi Jun le16_to_cpu(udev->config[0].desc.wTotalLength), 22257d2d641cSLi Jun USB_DT_OTG, (void **) &desc); 22267d2d641cSLi Jun if (err || !(desc->bmAttributes & USB_OTG_HNP)) 22277d2d641cSLi Jun return 0; 22287d2d641cSLi Jun 22297d2d641cSLi Jun dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", 22307d2d641cSLi Jun (port1 == bus->otg_port) ? "" : "non-"); 22311da177e4SLinus Torvalds 22321da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 22337d2d641cSLi Jun if (port1 == bus->otg_port) { 22341da177e4SLinus Torvalds bus->b_hnp_enable = 1; 22351da177e4SLinus Torvalds err = usb_control_msg(udev, 22361da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 22371da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 22387d2d641cSLi Jun USB_DEVICE_B_HNP_ENABLE, 22397d2d641cSLi Jun 0, NULL, 0, 22407d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22411da177e4SLinus Torvalds if (err < 0) { 22427d2d641cSLi Jun /* 22437d2d641cSLi Jun * OTG MESSAGE: report errors here, 22441da177e4SLinus Torvalds * customize to match your product. 22451da177e4SLinus Torvalds */ 22467d2d641cSLi Jun dev_err(&udev->dev, "can't set HNP mode: %d\n", 22471da177e4SLinus Torvalds err); 22481da177e4SLinus Torvalds bus->b_hnp_enable = 0; 22491da177e4SLinus Torvalds } 22507d2d641cSLi Jun } else if (desc->bLength == sizeof 22517d2d641cSLi Jun (struct usb_otg_descriptor)) { 22527d2d641cSLi Jun /* Set a_alt_hnp_support for legacy otg device */ 22537d2d641cSLi Jun err = usb_control_msg(udev, 22547d2d641cSLi Jun usb_sndctrlpipe(udev, 0), 22557d2d641cSLi Jun USB_REQ_SET_FEATURE, 0, 22567d2d641cSLi Jun USB_DEVICE_A_ALT_HNP_SUPPORT, 22577d2d641cSLi Jun 0, NULL, 0, 22587d2d641cSLi Jun USB_CTRL_SET_TIMEOUT); 22597d2d641cSLi Jun if (err < 0) 22607d2d641cSLi Jun dev_err(&udev->dev, 22617d2d641cSLi Jun "set a_alt_hnp_support failed: %d\n", 22627d2d641cSLi Jun err); 22631da177e4SLinus Torvalds } 22641da177e4SLinus Torvalds } 22651da177e4SLinus Torvalds #endif 2266d9d16e8aSInaky Perez-Gonzalez return err; 2267d9d16e8aSInaky Perez-Gonzalez } 22681da177e4SLinus Torvalds 2269d9d16e8aSInaky Perez-Gonzalez 2270d9d16e8aSInaky Perez-Gonzalez /** 22718d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2272d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2273d9d16e8aSInaky Perez-Gonzalez * 2274d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2275d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2276d9d16e8aSInaky Perez-Gonzalez * environment. 2277d9d16e8aSInaky Perez-Gonzalez * 2278d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2279d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2280d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2281626f090cSYacine Belkadi * 2282626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2283d9d16e8aSInaky Perez-Gonzalez */ 22848d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2285d9d16e8aSInaky Perez-Gonzalez { 2286d9d16e8aSInaky Perez-Gonzalez int err; 2287026f3fcbSPeter Chen struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2288d9d16e8aSInaky Perez-Gonzalez 2289d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2290d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2291d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2292e9e88fb7SAlan Stern if (err != -ENODEV) 2293d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2294d9d16e8aSInaky Perez-Gonzalez err); 229580da2e0dSLaurent Pinchart return err; 2296d9d16e8aSInaky Perez-Gonzalez } 2297d9d16e8aSInaky Perez-Gonzalez } 229883e83ecbSThomas Pugliese 2299d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2300d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2301d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2302d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2303d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 230483e83ecbSThomas Pugliese 23058d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 230680da2e0dSLaurent Pinchart if (err < 0) 2307d9d16e8aSInaky Perez-Gonzalez return err; 230880da2e0dSLaurent Pinchart 2309026f3fcbSPeter Chen if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support && 2310e5a9d621SPeter Chen !is_targeted(udev)) { 2311026f3fcbSPeter Chen /* Maybe it can talk to us, though we can't talk to it. 2312026f3fcbSPeter Chen * (Includes HNP test device.) 2313026f3fcbSPeter Chen */ 2314e5a9d621SPeter Chen if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable 2315e5a9d621SPeter Chen || udev->bus->is_b_host)) { 2316026f3fcbSPeter Chen err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); 2317026f3fcbSPeter Chen if (err < 0) 2318026f3fcbSPeter Chen dev_dbg(&udev->dev, "HNP fail, %d\n", err); 2319026f3fcbSPeter Chen } 2320026f3fcbSPeter Chen return -ENOTSUPP; 2321026f3fcbSPeter Chen } 2322026f3fcbSPeter Chen 232380da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 232480da2e0dSLaurent Pinchart 232580da2e0dSLaurent Pinchart return 0; 2326d9d16e8aSInaky Perez-Gonzalez } 2327d9d16e8aSInaky Perez-Gonzalez 2328d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2329d35e70d5SMatthew Garrett { 2330d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2331d35e70d5SMatthew Garrett struct usb_hub *hub; 2332d35e70d5SMatthew Garrett u8 port = udev->portnum; 2333d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2334d35e70d5SMatthew Garrett bool removable = true; 2335d35e70d5SMatthew Garrett 2336d35e70d5SMatthew Garrett if (!hdev) 2337d35e70d5SMatthew Garrett return; 2338d35e70d5SMatthew Garrett 2339ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2340d35e70d5SMatthew Garrett 234192bfbf71SMatthew Garrett /* 234292bfbf71SMatthew Garrett * If the platform firmware has provided information about a port, 234392bfbf71SMatthew Garrett * use that to determine whether it's removable. 234492bfbf71SMatthew Garrett */ 234592bfbf71SMatthew Garrett switch (hub->ports[udev->portnum - 1]->connect_type) { 234692bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HOT_PLUG: 234792bfbf71SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 234892bfbf71SMatthew Garrett return; 234992bfbf71SMatthew Garrett case USB_PORT_CONNECT_TYPE_HARD_WIRED: 235058339c2eSMatthew Garrett case USB_PORT_NOT_USED: 235192bfbf71SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 235292bfbf71SMatthew Garrett return; 235358339c2eSMatthew Garrett default: 235458339c2eSMatthew Garrett break; 235592bfbf71SMatthew Garrett } 235692bfbf71SMatthew Garrett 235792bfbf71SMatthew Garrett /* 235892bfbf71SMatthew Garrett * Otherwise, check whether the hub knows whether a port is removable 235992bfbf71SMatthew Garrett * or not 236092bfbf71SMatthew Garrett */ 2361d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2362d35e70d5SMatthew Garrett 2363d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2364d35e70d5SMatthew Garrett return; 2365d35e70d5SMatthew Garrett 2366d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2367ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2368ca3c1539SLan Tianyu & (1 << port)) 2369d35e70d5SMatthew Garrett removable = false; 2370d35e70d5SMatthew Garrett } else { 2371d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2372d35e70d5SMatthew Garrett removable = false; 2373d35e70d5SMatthew Garrett } 2374d35e70d5SMatthew Garrett 2375d35e70d5SMatthew Garrett if (removable) 2376d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2377d35e70d5SMatthew Garrett else 2378d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2379a4204ff0SDan Williams 2380d35e70d5SMatthew Garrett } 2381d9d16e8aSInaky Perez-Gonzalez 2382d9d16e8aSInaky Perez-Gonzalez /** 2383d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2384d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2385d9d16e8aSInaky Perez-Gonzalez * 23868d8558d1SAlan Stern * This is called with devices which have been detected but not fully 23878d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2388d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2389d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2390a4b5d606SHeiner Kallweit * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to 2391d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2392d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2393d9d16e8aSInaky Perez-Gonzalez * 2394d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2395d9d16e8aSInaky Perez-Gonzalez * 2396d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2397626f090cSYacine Belkadi * 2398626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2399626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2400626f090cSYacine Belkadi * value. 2401626f090cSYacine Belkadi * 2402d9d16e8aSInaky Perez-Gonzalez */ 2403d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2404d9d16e8aSInaky Perez-Gonzalez { 2405d9d16e8aSInaky Perez-Gonzalez int err; 2406d9d16e8aSInaky Perez-Gonzalez 240716985408SDan Streetman if (udev->parent) { 240816985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 240916985408SDan Streetman * device (un)configuration controls wakeup capable 241016985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 241116985408SDan Streetman */ 241216985408SDan Streetman device_init_wakeup(&udev->dev, 0); 241316985408SDan Streetman } 241416985408SDan Streetman 24159bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 24169bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2417c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2418fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 24199bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 24209bbdf1e0SAlan Stern 2421c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2422c08512c7SAlan Stern * allowed for hubs during binding. 2423c08512c7SAlan Stern */ 2424c08512c7SAlan Stern usb_disable_autosuspend(udev); 2425c08512c7SAlan Stern 24268d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2427d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2428d9d16e8aSInaky Perez-Gonzalez goto fail; 2429c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2430c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2431c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24329f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 24339f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 24349f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 24359f8b17e6SKay Sievers 24366cd13201SAlan Stern /* Tell the world! */ 24376cd13201SAlan Stern announce_device(udev); 2438195af2ccSAlan Stern 2439b04b3156STheodore Ts'o if (udev->serial) 2440b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2441b04b3156STheodore Ts'o if (udev->product) 2442b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2443b04b3156STheodore Ts'o if (udev->manufacturer) 2444b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2445b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2446b04b3156STheodore Ts'o 2447927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2448d35e70d5SMatthew Garrett 2449a4204ff0SDan Williams /* check whether the hub or firmware marks this port as non-removable */ 2450d35e70d5SMatthew Garrett if (udev->parent) 2451d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2452d35e70d5SMatthew Garrett 2453782da727SAlan Stern /* Register the device. The device driver is responsible 24543b23dd6fSAlan Stern * for configuring the device and invoking the add-device 24553b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2456782da727SAlan Stern */ 24571da177e4SLinus Torvalds err = device_add(&udev->dev); 24581da177e4SLinus Torvalds if (err) { 24591da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 24601da177e4SLinus Torvalds goto fail; 24611da177e4SLinus Torvalds } 24629ad3d6ccSAlan Stern 2463fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2464fde26380SLan Tianyu if (udev->parent) { 2465ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2466d5c3834eSDan Williams int port1 = udev->portnum; 2467d5c3834eSDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 2468fde26380SLan Tianyu 2469fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2470fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2471fde26380SLan Tianyu if (err) 2472fde26380SLan Tianyu goto fail; 2473fde26380SLan Tianyu 2474fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2475fde26380SLan Tianyu &udev->dev.kobj, "device"); 2476fde26380SLan Tianyu if (err) { 2477fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2478fde26380SLan Tianyu goto fail; 2479fde26380SLan Tianyu } 2480971fcd49SLan Tianyu 2481d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) 2482971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2483fde26380SLan Tianyu } 2484fde26380SLan Tianyu 24853b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2486c08512c7SAlan Stern usb_mark_last_busy(udev); 2487c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2488c066475eSGreg Kroah-Hartman return err; 24891da177e4SLinus Torvalds 24901da177e4SLinus Torvalds fail: 24911da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 24929bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 24939bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2494d9d16e8aSInaky Perez-Gonzalez return err; 24951da177e4SLinus Torvalds } 24961da177e4SLinus Torvalds 249793993a0aSInaky Perez-Gonzalez 249893993a0aSInaky Perez-Gonzalez /** 2499fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2500fd39c86bSRandy Dunlap * @usb_dev: USB device 2501fd39c86bSRandy Dunlap * 2502fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2503fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 250493993a0aSInaky Perez-Gonzalez * 250593993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 250693993a0aSInaky Perez-Gonzalez * defer its call. 2507626f090cSYacine Belkadi * 2508626f090cSYacine Belkadi * Return: 0. 250993993a0aSInaky Perez-Gonzalez */ 251093993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 251193993a0aSInaky Perez-Gonzalez { 251293993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 251393993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 251493993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2515da307123SAlan Stern 251693993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 251793993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2518da307123SAlan Stern 251993993a0aSInaky Perez-Gonzalez out_unauthorized: 252093993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 252193993a0aSInaky Perez-Gonzalez return 0; 252293993a0aSInaky Perez-Gonzalez } 252393993a0aSInaky Perez-Gonzalez 252493993a0aSInaky Perez-Gonzalez 252593993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 252693993a0aSInaky Perez-Gonzalez { 252793993a0aSInaky Perez-Gonzalez int result = 0, c; 2528da307123SAlan Stern 252993993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 253093993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 253193993a0aSInaky Perez-Gonzalez goto out_authorized; 2532da307123SAlan Stern 253393993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 253493993a0aSInaky Perez-Gonzalez if (result < 0) { 253593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 253693993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 253793993a0aSInaky Perez-Gonzalez goto error_autoresume; 253893993a0aSInaky Perez-Gonzalez } 2539e50a322eSJosef Gajdusek 2540e50a322eSJosef Gajdusek if (usb_dev->wusb) { 254193993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 254293993a0aSInaky Perez-Gonzalez if (result < 0) { 254393993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 254493993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 254593993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 254693993a0aSInaky Perez-Gonzalez } 2547e50a322eSJosef Gajdusek } 2548da307123SAlan Stern 254993993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 255093993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 255193993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 255293993a0aSInaky Perez-Gonzalez */ 2553b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 255493993a0aSInaky Perez-Gonzalez if (c >= 0) { 255593993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 255693993a0aSInaky Perez-Gonzalez if (result) { 255793993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 255893993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 255993993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 256093993a0aSInaky Perez-Gonzalez * set other configurations. */ 256193993a0aSInaky Perez-Gonzalez } 256293993a0aSInaky Perez-Gonzalez } 256393993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2564da307123SAlan Stern 256593993a0aSInaky Perez-Gonzalez error_device_descriptor: 2566da307123SAlan Stern usb_autosuspend_device(usb_dev); 256793993a0aSInaky Perez-Gonzalez error_autoresume: 256893993a0aSInaky Perez-Gonzalez out_authorized: 2569781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 257093993a0aSInaky Perez-Gonzalez return result; 257193993a0aSInaky Perez-Gonzalez } 257293993a0aSInaky Perez-Gonzalez 25730cdd49a1SMathias Nyman /* 25740cdd49a1SMathias Nyman * Return 1 if port speed is SuperSpeedPlus, 0 otherwise 25750cdd49a1SMathias Nyman * check it from the link protocol field of the current speed ID attribute. 25760cdd49a1SMathias Nyman * current speed ID is got from ext port status request. Sublink speed attribute 25770cdd49a1SMathias Nyman * table is returned with the hub BOS SSP device capability descriptor 25780cdd49a1SMathias Nyman */ 25790cdd49a1SMathias Nyman static int port_speed_is_ssp(struct usb_device *hdev, int speed_id) 25800cdd49a1SMathias Nyman { 25810cdd49a1SMathias Nyman int ssa_count; 25820cdd49a1SMathias Nyman u32 ss_attr; 25830cdd49a1SMathias Nyman int i; 25840cdd49a1SMathias Nyman struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; 25850cdd49a1SMathias Nyman 25860cdd49a1SMathias Nyman if (!ssp_cap) 25870cdd49a1SMathias Nyman return 0; 25880cdd49a1SMathias Nyman 25890cdd49a1SMathias Nyman ssa_count = le32_to_cpu(ssp_cap->bmAttributes) & 25900cdd49a1SMathias Nyman USB_SSP_SUBLINK_SPEED_ATTRIBS; 25910cdd49a1SMathias Nyman 25920cdd49a1SMathias Nyman for (i = 0; i <= ssa_count; i++) { 25930cdd49a1SMathias Nyman ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); 25940cdd49a1SMathias Nyman if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID)) 25950cdd49a1SMathias Nyman return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP); 25960cdd49a1SMathias Nyman } 25970cdd49a1SMathias Nyman return 0; 25980cdd49a1SMathias Nyman } 259993993a0aSInaky Perez-Gonzalez 26000165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 26010165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 26020165de09SInaky Perez-Gonzalez { 26030165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 26040165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 26050165de09SInaky Perez-Gonzalez return 0; 26066ae706aeSGeliang Tang hcd = bus_to_hcd(hub->hdev->bus); 26070165de09SInaky Perez-Gonzalez return hcd->wireless; 26080165de09SInaky Perez-Gonzalez } 26090165de09SInaky Perez-Gonzalez 26100165de09SInaky Perez-Gonzalez 26111da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 26121da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 26131da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 26141da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 261590ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 26161da177e4SLinus Torvalds 261774072baeSMathias Nyman #define HUB_ROOT_RESET_TIME 60 /* times are in msec */ 26181da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 261975d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 26201da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 262177c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 26221da177e4SLinus Torvalds 262348fc7dbdSDan Williams /* 262448fc7dbdSDan Williams * "New scheme" enumeration causes an extra state transition to be 262548fc7dbdSDan Williams * exposed to an xhci host and causes USB3 devices to receive control 262648fc7dbdSDan Williams * commands in the default state. This has been seen to cause 262748fc7dbdSDan Williams * enumeration failures, so disable this enumeration scheme for USB3 262848fc7dbdSDan Williams * devices. 262948fc7dbdSDan Williams */ 263048fc7dbdSDan Williams static bool use_new_scheme(struct usb_device *udev, int retry) 263148fc7dbdSDan Williams { 26328a1b2725SMathias Nyman if (udev->speed >= USB_SPEED_SUPER) 263348fc7dbdSDan Williams return false; 263448fc7dbdSDan Williams 263548fc7dbdSDan Williams return USE_NEW_SCHEME(retry); 263648fc7dbdSDan Williams } 263748fc7dbdSDan Williams 2638025d4430SRahul Bedarkar /* Is a USB 3.0 port in the Inactive or Compliance Mode state? 26398bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 26408bea2bd3SStanislaw Ledwon */ 26413cd12f91SDan Williams static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, 26423cd12f91SDan Williams u16 portstatus) 264310d674a8SSarah Sharp { 26443cd12f91SDan Williams u16 link_state; 26453cd12f91SDan Williams 26463cd12f91SDan Williams if (!hub_is_superspeed(hub->hdev)) 26473cd12f91SDan Williams return false; 26483cd12f91SDan Williams 26493cd12f91SDan Williams if (test_bit(port1, hub->warm_reset_bits)) 26503cd12f91SDan Williams return true; 26513cd12f91SDan Williams 26523cd12f91SDan Williams link_state = portstatus & USB_PORT_STAT_LINK_STATE; 26533cd12f91SDan Williams return link_state == USB_SS_PORT_LS_SS_INACTIVE 26543cd12f91SDan Williams || link_state == USB_SS_PORT_LS_COMP_MOD; 265510d674a8SSarah Sharp } 265610d674a8SSarah Sharp 26571da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 265875d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 26591da177e4SLinus Torvalds { 26601da177e4SLinus Torvalds int delay_time, ret; 26611da177e4SLinus Torvalds u16 portstatus; 26621da177e4SLinus Torvalds u16 portchange; 26630cdd49a1SMathias Nyman u32 ext_portstatus = 0; 26641da177e4SLinus Torvalds 26651da177e4SLinus Torvalds for (delay_time = 0; 26661da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 26671da177e4SLinus Torvalds delay_time += delay) { 26681da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 26691da177e4SLinus Torvalds msleep(delay); 26701da177e4SLinus Torvalds 26711da177e4SLinus Torvalds /* read and decode port status */ 26720cdd49a1SMathias Nyman if (hub_is_superspeedplus(hub->hdev)) 26730cdd49a1SMathias Nyman ret = hub_ext_port_status(hub, port1, 26740cdd49a1SMathias Nyman HUB_EXT_PORT_STATUS, 26750cdd49a1SMathias Nyman &portstatus, &portchange, 26760cdd49a1SMathias Nyman &ext_portstatus); 26770cdd49a1SMathias Nyman else 26780cdd49a1SMathias Nyman ret = hub_port_status(hub, port1, &portstatus, 26790cdd49a1SMathias Nyman &portchange); 26801da177e4SLinus Torvalds if (ret < 0) 26811da177e4SLinus Torvalds return ret; 26821da177e4SLinus Torvalds 268322547c4cSGuenter Roeck /* 268422547c4cSGuenter Roeck * The port state is unknown until the reset completes. 268522547c4cSGuenter Roeck * 268622547c4cSGuenter Roeck * On top of that, some chips may require additional time 268722547c4cSGuenter Roeck * to re-establish a connection after the reset is complete, 268822547c4cSGuenter Roeck * so also wait for the connection to be re-established. 268922547c4cSGuenter Roeck */ 269022547c4cSGuenter Roeck if (!(portstatus & USB_PORT_STAT_RESET) && 269122547c4cSGuenter Roeck (portstatus & USB_PORT_STAT_CONNECTION)) 2692470f0be8SSarah Sharp break; 2693470f0be8SSarah Sharp 2694470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2695470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2696470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2697470f0be8SSarah Sharp 2698d99f6b41SDan Williams dev_dbg(&hub->ports[port1 - 1]->dev, 2699d99f6b41SDan Williams "not %sreset yet, waiting %dms\n", 2700d99f6b41SDan Williams warm ? "warm " : "", delay); 2701470f0be8SSarah Sharp } 2702470f0be8SSarah Sharp 27034f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2704470f0be8SSarah Sharp return -EBUSY; 27054f43447eSSarah Sharp 27063cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) 2707a24a6078SSarah Sharp return -ENOTCONN; 270810d674a8SSarah Sharp 27091da177e4SLinus Torvalds /* Device went away? */ 27101da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 27111da177e4SLinus Torvalds return -ENOTCONN; 27121da177e4SLinus Torvalds 2713a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2714a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2715a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2716a24a6078SSarah Sharp */ 2717a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2718a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2719dd4dd19eSAlan Stern return -ENOTCONN; 27201da177e4SLinus Torvalds 2721470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2722470f0be8SSarah Sharp return -EBUSY; 2723470f0be8SSarah Sharp 27242d4fa940SSarah Sharp if (!udev) 27252d4fa940SSarah Sharp return 0; 27262d4fa940SSarah Sharp 27270165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2728551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 27290cdd49a1SMathias Nyman else if (hub_is_superspeedplus(hub->hdev) && 27300cdd49a1SMathias Nyman port_speed_is_ssp(hub->hdev, ext_portstatus & 27310cdd49a1SMathias Nyman USB_EXT_PORT_STAT_RX_SPEED_ID)) 27320cdd49a1SMathias Nyman udev->speed = USB_SPEED_SUPER_PLUS; 2733131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2734809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 27350165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 27361da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 27371da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 27381da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 27391da177e4SLinus Torvalds else 27401da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 27411da177e4SLinus Torvalds return 0; 27421da177e4SLinus Torvalds } 27431da177e4SLinus Torvalds 274475d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 274575d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 274675d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 274775d7cf72SAndiry Xu { 274875d7cf72SAndiry Xu int i, status; 2749a24a6078SSarah Sharp u16 portchange, portstatus; 2750d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 275175d7cf72SAndiry Xu 275275d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 27530fe51aa5SSarah Sharp if (warm) { 275475d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 275575d7cf72SAndiry Xu "warm reset\n"); 275675d7cf72SAndiry Xu return -EINVAL; 275775d7cf72SAndiry Xu } 27580fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 27590fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 27600fe51aa5SSarah Sharp */ 27610fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2762d3b9d7a9SSarah Sharp } else if (!warm) { 2763d3b9d7a9SSarah Sharp /* 2764d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2765d3b9d7a9SSarah Sharp * double check and see if one is needed. 2766d3b9d7a9SSarah Sharp */ 2767fb6d1f7dSRobert Schlabbach if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) 2768fb6d1f7dSRobert Schlabbach if (hub_port_warm_reset_required(hub, port1, 2769fb6d1f7dSRobert Schlabbach portstatus)) 2770d3b9d7a9SSarah Sharp warm = true; 277175d7cf72SAndiry Xu } 27723cd12f91SDan Williams clear_bit(port1, hub->warm_reset_bits); 277375d7cf72SAndiry Xu 277475d7cf72SAndiry Xu /* Reset the port */ 277575d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 277675d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 277775d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 277875d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2779e9e88fb7SAlan Stern if (status == -ENODEV) { 2780e9e88fb7SAlan Stern ; /* The hub is gone */ 2781e9e88fb7SAlan Stern } else if (status) { 2782d99f6b41SDan Williams dev_err(&port_dev->dev, 2783d99f6b41SDan Williams "cannot %sreset (err = %d)\n", 2784d99f6b41SDan Williams warm ? "warm " : "", status); 278575d7cf72SAndiry Xu } else { 278675d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 278775d7cf72SAndiry Xu warm); 2788e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 278975d7cf72SAndiry Xu dev_dbg(hub->intfdev, 279075d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 279175d7cf72SAndiry Xu status); 279275d7cf72SAndiry Xu } 279375d7cf72SAndiry Xu 2794a24a6078SSarah Sharp /* Check for disconnect or reset */ 279575d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2796fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2797fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_RESET); 2798a24a6078SSarah Sharp 2799a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 280032fe0198SAlan Stern goto done; 2801a24a6078SSarah Sharp 2802fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2803fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_BH_PORT_RESET); 2804fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2805fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_PORT_LINK_STATE); 2806fb6d1f7dSRobert Schlabbach usb_clear_port_feature(hub->hdev, port1, 2807fb6d1f7dSRobert Schlabbach USB_PORT_FEAT_C_CONNECTION); 2808fb6d1f7dSRobert Schlabbach 2809a24a6078SSarah Sharp /* 2810a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2811a24a6078SSarah Sharp * state, re-issue the warm reset. 2812a24a6078SSarah Sharp */ 2813a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2814a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2815a24a6078SSarah Sharp goto done; 2816a24a6078SSarah Sharp 28173cd12f91SDan Williams if (!hub_port_warm_reset_required(hub, port1, 28183cd12f91SDan Williams portstatus)) 2819a24a6078SSarah Sharp goto done; 2820a24a6078SSarah Sharp 2821a24a6078SSarah Sharp /* 2822a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2823a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2824a24a6078SSarah Sharp */ 2825a24a6078SSarah Sharp if (!warm) { 2826d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2827d99f6b41SDan Williams "hot reset failed, warm reset\n"); 2828a24a6078SSarah Sharp warm = true; 2829a24a6078SSarah Sharp } 28301da177e4SLinus Torvalds } 28311da177e4SLinus Torvalds 2832d99f6b41SDan Williams dev_dbg(&port_dev->dev, 2833d99f6b41SDan Williams "not enabled, trying %sreset again...\n", 2834d99f6b41SDan Williams warm ? "warm " : ""); 28351da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 28361da177e4SLinus Torvalds } 28371da177e4SLinus Torvalds 2838d99f6b41SDan Williams dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); 28391da177e4SLinus Torvalds 284032fe0198SAlan Stern done: 2841fb6d1f7dSRobert Schlabbach if (status == 0) { 2842fb6d1f7dSRobert Schlabbach /* TRSTRCY = 10 ms; plus some extra */ 2843fb6d1f7dSRobert Schlabbach msleep(10 + 40); 2844fb6d1f7dSRobert Schlabbach if (udev) { 2845fb6d1f7dSRobert Schlabbach struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2846fb6d1f7dSRobert Schlabbach 2847fb6d1f7dSRobert Schlabbach update_devnum(udev, 0); 2848fb6d1f7dSRobert Schlabbach /* The xHC may think the device is already reset, 2849fb6d1f7dSRobert Schlabbach * so ignore the status. 2850fb6d1f7dSRobert Schlabbach */ 2851fb6d1f7dSRobert Schlabbach if (hcd->driver->reset_device) 2852fb6d1f7dSRobert Schlabbach hcd->driver->reset_device(hcd, udev); 2853fb6d1f7dSRobert Schlabbach 2854fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_DEFAULT); 2855fb6d1f7dSRobert Schlabbach } 2856fb6d1f7dSRobert Schlabbach } else { 2857fb6d1f7dSRobert Schlabbach if (udev) 2858fb6d1f7dSRobert Schlabbach usb_set_device_state(udev, USB_STATE_NOTATTACHED); 2859fb6d1f7dSRobert Schlabbach } 2860fb6d1f7dSRobert Schlabbach 28610fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 286232fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 286375d7cf72SAndiry Xu 28641da177e4SLinus Torvalds return status; 28651da177e4SLinus Torvalds } 28661da177e4SLinus Torvalds 28670ed9a57eSAndiry Xu /* Check if a port is power on */ 28680ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 28690ed9a57eSAndiry Xu { 28700ed9a57eSAndiry Xu int ret = 0; 28710ed9a57eSAndiry Xu 28720ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 28730ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 28740ed9a57eSAndiry Xu ret = 1; 28750ed9a57eSAndiry Xu } else { 28760ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 28770ed9a57eSAndiry Xu ret = 1; 28780ed9a57eSAndiry Xu } 28790ed9a57eSAndiry Xu 28800ed9a57eSAndiry Xu return ret; 28810ed9a57eSAndiry Xu } 28820ed9a57eSAndiry Xu 28835c79a1e3SDan Williams static void usb_lock_port(struct usb_port *port_dev) 28845c79a1e3SDan Williams __acquires(&port_dev->status_lock) 28855c79a1e3SDan Williams { 28865c79a1e3SDan Williams mutex_lock(&port_dev->status_lock); 28875c79a1e3SDan Williams __acquire(&port_dev->status_lock); 28885c79a1e3SDan Williams } 28895c79a1e3SDan Williams 28905c79a1e3SDan Williams static void usb_unlock_port(struct usb_port *port_dev) 28915c79a1e3SDan Williams __releases(&port_dev->status_lock) 28925c79a1e3SDan Williams { 28935c79a1e3SDan Williams mutex_unlock(&port_dev->status_lock); 28945c79a1e3SDan Williams __release(&port_dev->status_lock); 28955c79a1e3SDan Williams } 28965c79a1e3SDan Williams 2897d388dab7SAlan Stern #ifdef CONFIG_PM 28981da177e4SLinus Torvalds 28990ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 29000ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 29010ed9a57eSAndiry Xu { 29020ed9a57eSAndiry Xu int ret = 0; 29030ed9a57eSAndiry Xu 29040ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 29050ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 29060ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 29070ed9a57eSAndiry Xu ret = 1; 29080ed9a57eSAndiry Xu } else { 29090ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 29100ed9a57eSAndiry Xu ret = 1; 29110ed9a57eSAndiry Xu } 29120ed9a57eSAndiry Xu 29130ed9a57eSAndiry Xu return ret; 29140ed9a57eSAndiry Xu } 2915b01b03f3SAlan Stern 2916b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2917b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2918b01b03f3SAlan Stern */ 2919b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2920b01b03f3SAlan Stern struct usb_hub *hub, int port1, 29217fa40910SJulius Werner int status, u16 portchange, u16 portstatus) 2922b01b03f3SAlan Stern { 2923d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 29247fa40910SJulius Werner int retries = 3; 2925d99f6b41SDan Williams 29267fa40910SJulius Werner retry: 29273cd12f91SDan Williams /* Is a warm reset needed to recover the connection? */ 29283cd12f91SDan Williams if (status == 0 && udev->reset_resume 29293cd12f91SDan Williams && hub_port_warm_reset_required(hub, port1, portstatus)) { 29303cd12f91SDan Williams /* pass */; 29313cd12f91SDan Williams } 2932b01b03f3SAlan Stern /* Is the device still present? */ 29333cd12f91SDan Williams else if (status || port_is_suspended(hub, portstatus) || 29347fa40910SJulius Werner !port_is_power_on(hub, portstatus)) { 2935b01b03f3SAlan Stern if (status >= 0) 2936b01b03f3SAlan Stern status = -ENODEV; 29377fa40910SJulius Werner } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { 29387fa40910SJulius Werner if (retries--) { 29397fa40910SJulius Werner usleep_range(200, 300); 29407fa40910SJulius Werner status = hub_port_status(hub, port1, &portstatus, 29417fa40910SJulius Werner &portchange); 29427fa40910SJulius Werner goto retry; 29437fa40910SJulius Werner } 29447fa40910SJulius Werner status = -ENODEV; 2945b01b03f3SAlan Stern } 2946b01b03f3SAlan Stern 294786c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 294886c57edfSAlan Stern * so try a reset-resume instead. 294986c57edfSAlan Stern */ 295086c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 295186c57edfSAlan Stern if (udev->persist_enabled) 295286c57edfSAlan Stern udev->reset_resume = 1; 295386c57edfSAlan Stern else 2954b01b03f3SAlan Stern status = -ENODEV; 295586c57edfSAlan Stern } 2956b01b03f3SAlan Stern 2957b01b03f3SAlan Stern if (status) { 2958d99f6b41SDan Williams dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", 2959d99f6b41SDan Williams portchange, portstatus, status); 2960b01b03f3SAlan Stern } else if (udev->reset_resume) { 2961b01b03f3SAlan Stern 2962b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2963b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2964ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2965b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2966b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2967ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2968b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2969b01b03f3SAlan Stern } 2970b01b03f3SAlan Stern 2971b01b03f3SAlan Stern return status; 2972b01b03f3SAlan Stern } 2973b01b03f3SAlan Stern 2974f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2975f74631e3SSarah Sharp { 2976f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2977f74631e3SSarah Sharp 2978f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2979f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2980f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2981f74631e3SSarah Sharp return 0; 2982f74631e3SSarah Sharp 2983f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2984f74631e3SSarah Sharp * configured. 2985f74631e3SSarah Sharp */ 2986f74631e3SSarah Sharp if (!udev->actconfig) 2987f74631e3SSarah Sharp return 0; 2988f74631e3SSarah Sharp 2989f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2990f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2991f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2992f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2993f74631e3SSarah Sharp } 2994f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2995f74631e3SSarah Sharp 2996f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2997f74631e3SSarah Sharp { 2998f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2999f74631e3SSarah Sharp 3000f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 3001f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 3002f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 3003f74631e3SSarah Sharp return; 3004f74631e3SSarah Sharp 3005f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 3006f74631e3SSarah Sharp * configured. 3007f74631e3SSarah Sharp */ 3008f74631e3SSarah Sharp if (!udev->actconfig) 3009f74631e3SSarah Sharp return; 3010f74631e3SSarah Sharp 3011f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 3012f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 3013f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 3014f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 3015f74631e3SSarah Sharp } 3016f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3017f74631e3SSarah Sharp 301854a3ac0cSLan Tianyu /* 301928e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 302054a3ac0cSLan Tianyu * @udev: target device 302154a3ac0cSLan Tianyu * 302228e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 302328e86165SAlan Stern * 302428e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 302528e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 302628e86165SAlan Stern * association descriptor shows there's more than one function. 302754a3ac0cSLan Tianyu */ 302828e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 302954a3ac0cSLan Tianyu { 303028e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 303128e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 303228e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 303328e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 303428e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 303528e86165SAlan Stern else 303628e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 303728e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 303828e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 303928e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 304028e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 304128e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 304228e86165SAlan Stern } 304328e86165SAlan Stern 304428e86165SAlan Stern /* 304528e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 304628e86165SAlan Stern * @udev: target device 304728e86165SAlan Stern * 304828e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 304928e86165SAlan Stern * 305028e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 305128e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 305228e86165SAlan Stern * association descriptor shows there's more than one function. 305328e86165SAlan Stern */ 305428e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 305528e86165SAlan Stern { 305628e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 305728e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 305828e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 305928e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 306028e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 306128e86165SAlan Stern else 306254a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 30634e248000SYonglong Wu USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 306454a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 306554a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 306654a3ac0cSLan Tianyu } 30671da177e4SLinus Torvalds 3068e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 3069e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 3070e583d9dbSAlan Stern { 3071e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 3072e583d9dbSAlan Stern 3073e583d9dbSAlan Stern return udev->do_remote_wakeup + 3074e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 3075e583d9dbSAlan Stern } 3076e583d9dbSAlan Stern 30771da177e4SLinus Torvalds /* 3078140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 3079624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 30805edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 30811da177e4SLinus Torvalds * 30821da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 30831da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 30841da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 3085140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 30861da177e4SLinus Torvalds * to disconnect devices while they are suspended. 30871da177e4SLinus Torvalds * 3088390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 3089390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 3090390a8c34SDavid Brownell * 3091624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 3092624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 3093624d6c07SAlan Stern * All devices below the suspended port are also suspended. 3094624d6c07SAlan Stern * 3095624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 3096624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 3097624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 3098624d6c07SAlan Stern * some cases, this wakes the USB host. 3099624d6c07SAlan Stern * 31001da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 31011da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 31021da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 31031da177e4SLinus Torvalds * 31044956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 31054956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 31064956eccdSAlan Stern * State transitions include: 31074956eccdSAlan Stern * 31084956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 31094956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 31104956eccdSAlan Stern * 31114956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 31124956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 31134956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 311437ebb549SPetr Mladek * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq 31154956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 31164956eccdSAlan Stern * 3117e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 3118e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 31190aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 31200aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 31210aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 31224956eccdSAlan Stern * 31231da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 31241da177e4SLinus Torvalds */ 312565bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 31261da177e4SLinus Torvalds { 3127ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3128ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3129624d6c07SAlan Stern int port1 = udev->portnum; 3130624d6c07SAlan Stern int status; 31310aa2832dSAlan Stern bool really_suspend = true; 31324956eccdSAlan Stern 31335c79a1e3SDan Williams usb_lock_port(port_dev); 31345c79a1e3SDan Williams 3135624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 3136624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 3137624d6c07SAlan Stern * 3138624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 3139624d6c07SAlan Stern * we don't explicitly enable it here. 3140624d6c07SAlan Stern */ 3141624d6c07SAlan Stern if (udev->do_remote_wakeup) { 314228e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 31430c487206SOliver Neukum if (status) { 3144624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 3145624d6c07SAlan Stern status); 31460c487206SOliver Neukum /* bail if autosuspend is requested */ 31475b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 31484fae6f0fSAlan Stern goto err_wakeup; 31490c487206SOliver Neukum } 3150624d6c07SAlan Stern } 3151624d6c07SAlan Stern 315265580b43SAndiry Xu /* disable USB2 hardware LPM */ 315365580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 315465580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 315565580b43SAndiry Xu 3156f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 31574fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); 31584fae6f0fSAlan Stern status = -ENOMEM; 31594fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 31604fae6f0fSAlan Stern goto err_ltm; 3161f74631e3SSarah Sharp } 31628306095fSSarah Sharp 3163624d6c07SAlan Stern /* see 7.1.7.6 */ 3164a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3165c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3166e583d9dbSAlan Stern 31670aa2832dSAlan Stern /* 31680aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 31690aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 31700aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 31710aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3172e583d9dbSAlan Stern * 3173e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3174e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3175e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3176e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 31770aa2832dSAlan Stern */ 3178e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3179e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3180e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 31810aa2832dSAlan Stern else { 31820aa2832dSAlan Stern really_suspend = false; 31830aa2832dSAlan Stern status = 0; 31840aa2832dSAlan Stern } 3185624d6c07SAlan Stern if (status) { 3186d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); 3187cbb33004SAlan Stern 3188d590c231SMathias Nyman /* Try to enable USB3 LTM again */ 31894fae6f0fSAlan Stern usb_enable_ltm(udev); 31904fae6f0fSAlan Stern err_ltm: 3191c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3192c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3193c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3194c3e751e4SAndiry Xu 31954fae6f0fSAlan Stern if (udev->do_remote_wakeup) 31964fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 31974fae6f0fSAlan Stern err_wakeup: 31988306095fSSarah Sharp 3199cbb33004SAlan Stern /* System sleep transitions should never fail */ 32005b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3201cbb33004SAlan Stern status = 0; 3202624d6c07SAlan Stern } else { 320330b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 320430b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 320530b1a7a3SAlan Stern udev->do_remote_wakeup); 32060aa2832dSAlan Stern if (really_suspend) { 3207bfd1e910SAlan Stern udev->port_is_suspended = 1; 3208e583d9dbSAlan Stern 3209e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3210624d6c07SAlan Stern msleep(10); 3211624d6c07SAlan Stern } 3212e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 32130aa2832dSAlan Stern } 3214ad493e5eSLan Tianyu 3215d5c3834eSDan Williams if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled 3216d5c3834eSDan Williams && test_and_clear_bit(port1, hub->child_usage_bits)) 3217ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3218ad493e5eSLan Tianyu 3219c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 32205c79a1e3SDan Williams 32215c79a1e3SDan Williams usb_unlock_port(port_dev); 32224956eccdSAlan Stern return status; 32231da177e4SLinus Torvalds } 3224f3f3253dSDavid Brownell 32251da177e4SLinus Torvalds /* 3226390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3227390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 322854515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 32291da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 32301da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 32311da177e4SLinus Torvalds * in the tree that's rooted at this device. 323254515fe5SAlan Stern * 323354515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 323454515fe5SAlan Stern * status check is done. 32351da177e4SLinus Torvalds */ 3236140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 32371da177e4SLinus Torvalds { 323854515fe5SAlan Stern int status = 0; 323907e72b95SOliver Neukum u16 devstatus = 0; 32401da177e4SLinus Torvalds 32411da177e4SLinus Torvalds /* caller owns the udev device lock */ 3242b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3243b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 32441da177e4SLinus Torvalds 32451da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 32461da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 32471da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 324837ebb549SPetr Mladek * during many timeouts, but hub_wq can't suspend until later. 32491da177e4SLinus Torvalds */ 32501da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 32511da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 32521da177e4SLinus Torvalds : USB_STATE_ADDRESS); 32531da177e4SLinus Torvalds 325454515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 325554515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 325654515fe5SAlan Stern * operation is carried out here, after the port has been 325754515fe5SAlan Stern * resumed. 325854515fe5SAlan Stern */ 32591d10255cSAlan Stern if (udev->reset_resume) { 32601d10255cSAlan Stern /* 32611d10255cSAlan Stern * If the device morphs or switches modes when it is reset, 32621d10255cSAlan Stern * we don't want to perform a reset-resume. We'll fail the 32631d10255cSAlan Stern * resume, which will cause a logical disconnect, and then 32641d10255cSAlan Stern * the device will be rediscovered. 32651d10255cSAlan Stern */ 326686c57edfSAlan Stern retry_reset_resume: 32671d10255cSAlan Stern if (udev->quirks & USB_QUIRK_RESET) 32681d10255cSAlan Stern status = -ENODEV; 32691d10255cSAlan Stern else 3270742120c6SMing Lei status = usb_reset_and_verify_device(udev); 32711d10255cSAlan Stern } 327254515fe5SAlan Stern 32731da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 32741da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 32751da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 32761da177e4SLinus Torvalds */ 327754515fe5SAlan Stern if (status == 0) { 327846dede46SAlan Stern devstatus = 0; 32791da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 328086c57edfSAlan Stern 328186c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 328286c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 328386c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 328486c57edfSAlan Stern udev->reset_resume = 1; 328586c57edfSAlan Stern goto retry_reset_resume; 328686c57edfSAlan Stern } 328754515fe5SAlan Stern } 3288b40b7a90SAlan Stern 3289624d6c07SAlan Stern if (status) { 3290624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 32911da177e4SLinus Torvalds status); 329207e72b95SOliver Neukum /* 329307e72b95SOliver Neukum * There are a few quirky devices which violate the standard 329407e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 329507e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 329607e72b95SOliver Neukum * udev->reset_resume 329707e72b95SOliver Neukum */ 329807e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 329928e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 330054a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 330128e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 330254a3ac0cSLan Tianyu } else { 330354a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 330454a3ac0cSLan Tianyu &devstatus); 330554a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 330654a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 330728e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 330854a3ac0cSLan Tianyu } 330954a3ac0cSLan Tianyu 3310a8e7c565SAlan Stern if (status) 3311b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3312b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3313b9cef6c3SWu Fengguang status); 33141da177e4SLinus Torvalds status = 0; 33151da177e4SLinus Torvalds } 33161da177e4SLinus Torvalds return status; 33171da177e4SLinus Torvalds } 33181da177e4SLinus Torvalds 3319624d6c07SAlan Stern /* 3320a40178b2SPratyush Anand * There are some SS USB devices which take longer time for link training. 3321a40178b2SPratyush Anand * XHCI specs 4.19.4 says that when Link training is successful, port 33226b82b122SAl Cooper * sets CCS bit to 1. So if SW reads port status before successful link 3323a40178b2SPratyush Anand * training, then it will not find device to be present. 3324a40178b2SPratyush Anand * USB Analyzer log with such buggy devices show that in some cases 3325a40178b2SPratyush Anand * device switch on the RX termination after long delay of host enabling 3326a40178b2SPratyush Anand * the VBUS. In few other cases it has been seen that device fails to 3327a40178b2SPratyush Anand * negotiate link training in first attempt. It has been 3328a40178b2SPratyush Anand * reported till now that few devices take as long as 2000 ms to train 3329a40178b2SPratyush Anand * the link after host enabling its VBUS and termination. Following 3330a40178b2SPratyush Anand * routine implements a 2000 ms timeout for link training. If in a case 3331a40178b2SPratyush Anand * link trains before timeout, loop will exit earlier. 3332a40178b2SPratyush Anand * 33336b82b122SAl Cooper * There are also some 2.0 hard drive based devices and 3.0 thumb 33346b82b122SAl Cooper * drives that, when plugged into a 2.0 only port, take a long 33356b82b122SAl Cooper * time to set CCS after VBUS enable. 33366b82b122SAl Cooper * 3337a40178b2SPratyush Anand * FIXME: If a device was connected before suspend, but was removed 3338a40178b2SPratyush Anand * while system was asleep, then the loop in the following routine will 3339a40178b2SPratyush Anand * only exit at timeout. 3340a40178b2SPratyush Anand * 33416b82b122SAl Cooper * This routine should only be called when persist is enabled. 3342a40178b2SPratyush Anand */ 33436b82b122SAl Cooper static int wait_for_connected(struct usb_device *udev, 3344a40178b2SPratyush Anand struct usb_hub *hub, int *port1, 3345a40178b2SPratyush Anand u16 *portchange, u16 *portstatus) 3346a40178b2SPratyush Anand { 3347a40178b2SPratyush Anand int status = 0, delay_ms = 0; 3348a40178b2SPratyush Anand 3349a40178b2SPratyush Anand while (delay_ms < 2000) { 3350a40178b2SPratyush Anand if (status || *portstatus & USB_PORT_STAT_CONNECTION) 3351a40178b2SPratyush Anand break; 3352a40178b2SPratyush Anand msleep(20); 3353a40178b2SPratyush Anand delay_ms += 20; 3354a40178b2SPratyush Anand status = hub_port_status(hub, *port1, portstatus, portchange); 3355a40178b2SPratyush Anand } 33566b82b122SAl Cooper dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); 3357a40178b2SPratyush Anand return status; 3358a40178b2SPratyush Anand } 3359a40178b2SPratyush Anand 3360a40178b2SPratyush Anand /* 3361624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3362624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3363624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3364624d6c07SAlan Stern * 3365624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3366624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3367624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3368624d6c07SAlan Stern * the host and the device is the same as it was when the device 3369624d6c07SAlan Stern * suspended. 3370624d6c07SAlan Stern * 3371feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3372feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 337354515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 337454515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 337554515fe5SAlan Stern * 337654515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 337754515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 337854515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 337954515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 338054515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 338154515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 338254515fe5SAlan Stern * made to appear as if it had not disconnected. 338354515fe5SAlan Stern * 3384742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3385feccc30dSAlan Stern * every effort to insure that the same device is present after the 338654515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 338754515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 338854515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 338954515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 339054515fe5SAlan Stern * new card is corrupted and the system crashes. 339154515fe5SAlan Stern * 3392624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3393624d6c07SAlan Stern */ 339465bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 33951da177e4SLinus Torvalds { 3396ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3397ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3398624d6c07SAlan Stern int port1 = udev->portnum; 33991da177e4SLinus Torvalds int status; 3400d25450c6SAlan Stern u16 portchange, portstatus; 3401d25450c6SAlan Stern 3402d5c3834eSDan Williams if (!test_and_set_bit(port1, hub->child_usage_bits)) { 3403ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3404ad493e5eSLan Tianyu if (status < 0) { 3405ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3406ad493e5eSLan Tianyu status); 3407ad493e5eSLan Tianyu return status; 3408ad493e5eSLan Tianyu } 3409ad493e5eSLan Tianyu } 3410ad493e5eSLan Tianyu 34115c79a1e3SDan Williams usb_lock_port(port_dev); 34125c79a1e3SDan Williams 3413d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3414d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 34150ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3416d25450c6SAlan Stern goto SuspendCleared; 34171da177e4SLinus Torvalds 34181da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3419a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3420c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3421a7114230SAndiry Xu else 3422ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 34231da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 34241da177e4SLinus Torvalds if (status) { 3425d99f6b41SDan Williams dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); 34261da177e4SLinus Torvalds } else { 3427bbc78c07SFelipe Balbi /* drive resume for USB_RESUME_TIMEOUT msec */ 3428645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 34295b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 3430bbc78c07SFelipe Balbi msleep(USB_RESUME_TIMEOUT); 34311da177e4SLinus Torvalds 34321da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 34331da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 34341da177e4SLinus Torvalds * sequence. 34351da177e4SLinus Torvalds */ 3436d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 343754515fe5SAlan Stern 34381da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 34391da177e4SLinus Torvalds msleep(10); 34401da177e4SLinus Torvalds } 3441b01b03f3SAlan Stern 3442b01b03f3SAlan Stern SuspendCleared: 3443b01b03f3SAlan Stern if (status == 0) { 3444bfd1e910SAlan Stern udev->port_is_suspended = 0; 3445a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3446a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3447ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3448a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3449a7114230SAndiry Xu } else { 3450b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3451ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3452b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 34531da177e4SLinus Torvalds } 3454a7114230SAndiry Xu } 34551da177e4SLinus Torvalds 34566b82b122SAl Cooper if (udev->persist_enabled) 34576b82b122SAl Cooper status = wait_for_connected(udev, hub, &port1, &portchange, 3458a40178b2SPratyush Anand &portstatus); 3459a40178b2SPratyush Anand 3460b01b03f3SAlan Stern status = check_port_resume_type(udev, 3461b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 346254515fe5SAlan Stern if (status == 0) 346354515fe5SAlan Stern status = finish_port_resume(udev); 346454515fe5SAlan Stern if (status < 0) { 346554515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 346654515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 346765580b43SAndiry Xu } else { 346865580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 346965580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 347065580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 34718306095fSSarah Sharp 3472d590c231SMathias Nyman /* Try to enable USB3 LTM */ 3473f74631e3SSarah Sharp usb_enable_ltm(udev); 347454515fe5SAlan Stern } 347565580b43SAndiry Xu 34765c79a1e3SDan Williams usb_unlock_port(port_dev); 34775c79a1e3SDan Williams 34781da177e4SLinus Torvalds return status; 34791da177e4SLinus Torvalds } 34801da177e4SLinus Torvalds 34810534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 34821da177e4SLinus Torvalds { 34831da177e4SLinus Torvalds int status = 0; 34841da177e4SLinus Torvalds 34855c79a1e3SDan Williams usb_lock_device(udev); 34861da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3487645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 34889bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 34899bbdf1e0SAlan Stern if (status == 0) { 34909bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 34919bbdf1e0SAlan Stern usb_autosuspend_device(udev); 34929bbdf1e0SAlan Stern } 3493d25450c6SAlan Stern } 34945c79a1e3SDan Williams usb_unlock_device(udev); 34951da177e4SLinus Torvalds return status; 34961da177e4SLinus Torvalds } 34971da177e4SLinus Torvalds 34987e73be22SDan Williams /* Returns 1 if there was a remote wakeup and a connect status change. */ 34997e73be22SDan Williams static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 35007e73be22SDan Williams u16 portstatus, u16 portchange) 35017e73be22SDan Williams __must_hold(&port_dev->status_lock) 35027e73be22SDan Williams { 35037e73be22SDan Williams struct usb_port *port_dev = hub->ports[port - 1]; 35047e73be22SDan Williams struct usb_device *hdev; 35057e73be22SDan Williams struct usb_device *udev; 35067e73be22SDan Williams int connect_change = 0; 35077e73be22SDan Williams int ret; 35087e73be22SDan Williams 35097e73be22SDan Williams hdev = hub->hdev; 35107e73be22SDan Williams udev = port_dev->child; 35117e73be22SDan Williams if (!hub_is_superspeed(hdev)) { 35127e73be22SDan Williams if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 35137e73be22SDan Williams return 0; 35147e73be22SDan Williams usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 35157e73be22SDan Williams } else { 35167e73be22SDan Williams if (!udev || udev->state != USB_STATE_SUSPENDED || 35177e73be22SDan Williams (portstatus & USB_PORT_STAT_LINK_STATE) != 35187e73be22SDan Williams USB_SS_PORT_LS_U0) 35197e73be22SDan Williams return 0; 35207e73be22SDan Williams } 35217e73be22SDan Williams 35227e73be22SDan Williams if (udev) { 35237e73be22SDan Williams /* TRSMRCY = 10 msec */ 35247e73be22SDan Williams msleep(10); 35257e73be22SDan Williams 35267e73be22SDan Williams usb_unlock_port(port_dev); 35277e73be22SDan Williams ret = usb_remote_wakeup(udev); 35287e73be22SDan Williams usb_lock_port(port_dev); 35297e73be22SDan Williams if (ret < 0) 35307e73be22SDan Williams connect_change = 1; 35317e73be22SDan Williams } else { 35327e73be22SDan Williams ret = -ENODEV; 35337e73be22SDan Williams hub_port_disable(hub, port, 1); 35347e73be22SDan Williams } 35357e73be22SDan Williams dev_dbg(&port_dev->dev, "resume, status %d\n", ret); 35367e73be22SDan Williams return connect_change; 35377e73be22SDan Williams } 35387e73be22SDan Williams 3539e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3540e6f30deaSMing Lei { 3541e6f30deaSMing Lei int port1; 3542e6f30deaSMing Lei 3543e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3544e6f30deaSMing Lei u16 portstatus, portchange; 3545e6f30deaSMing Lei int status; 3546e6f30deaSMing Lei 3547e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3548e6f30deaSMing Lei if (!status && portchange) 3549e6f30deaSMing Lei return 1; 3550e6f30deaSMing Lei } 3551e6f30deaSMing Lei return 0; 3552e6f30deaSMing Lei } 3553e6f30deaSMing Lei 3554db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 35551da177e4SLinus Torvalds { 35561da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 35571da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 35581da177e4SLinus Torvalds unsigned port1; 35594296c70aSSarah Sharp int status; 35601da177e4SLinus Torvalds 3561e583d9dbSAlan Stern /* 3562e583d9dbSAlan Stern * Warn if children aren't already suspended. 3563e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3564e583d9dbSAlan Stern */ 3565e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 35661da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 3567d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 3568d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 35691da177e4SLinus Torvalds 35706840d255SAlan Stern if (udev && udev->can_submit) { 3571b658b8f5SDan Williams dev_warn(&port_dev->dev, "device %s not suspended yet\n", 3572b658b8f5SDan Williams dev_name(&udev->dev)); 35735b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3574c9f89fa4SDavid Brownell return -EBUSY; 3575c9f89fa4SDavid Brownell } 3576e583d9dbSAlan Stern if (udev) 3577e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3578e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 35791da177e4SLinus Torvalds } 3580e6f30deaSMing Lei 3581e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3582e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3583e6f30deaSMing Lei if (check_ports_changed(hub)) { 3584e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3585e6f30deaSMing Lei return -EBUSY; 3586e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3587e6f30deaSMing Lei } 3588e6f30deaSMing Lei } 3589e6f30deaSMing Lei 35904296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 35914296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 35924296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 35934296c70aSSarah Sharp status = set_port_feature(hdev, 35944296c70aSSarah Sharp port1 | 35954296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 35964296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 35974296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 35984296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 35994296c70aSSarah Sharp } 36004296c70aSSarah Sharp } 36011da177e4SLinus Torvalds 3602441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 360340f122f3SAlan Stern 360437ebb549SPetr Mladek /* stop hub_wq and related activity */ 36054330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3606b6f6436dSAlan Stern return 0; 36071da177e4SLinus Torvalds } 36081da177e4SLinus Torvalds 36091da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 36101da177e4SLinus Torvalds { 36111da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 36121da177e4SLinus Torvalds 36135e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3614f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 36151da177e4SLinus Torvalds return 0; 36161da177e4SLinus Torvalds } 36171da177e4SLinus Torvalds 3618b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3619f07600cfSAlan Stern { 3620b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3621f07600cfSAlan Stern 36225e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3623f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3624f07600cfSAlan Stern return 0; 3625f07600cfSAlan Stern } 3626f07600cfSAlan Stern 362754515fe5SAlan Stern /** 362854515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 362954515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 363054515fe5SAlan Stern * 363154515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 363254515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3633feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3634feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3635feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3636feccc30dSAlan Stern * the others will be disconnected. 363754515fe5SAlan Stern */ 363854515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 363954515fe5SAlan Stern { 364054515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 364154515fe5SAlan Stern rhdev->reset_resume = 1; 364254515fe5SAlan Stern } 364354515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 364454515fe5SAlan Stern 36451ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 36461ea7e0e8SSarah Sharp "U0", 36471ea7e0e8SSarah Sharp "U1", 36481ea7e0e8SSarah Sharp "U2", 36491ea7e0e8SSarah Sharp "U3", 36501ea7e0e8SSarah Sharp }; 36511ea7e0e8SSarah Sharp 36521ea7e0e8SSarah Sharp /* 36531ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 36541ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 36551ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 36561ea7e0e8SSarah Sharp * packet from the host. 36571ea7e0e8SSarah Sharp * 36581ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 36591ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 36601ea7e0e8SSarah Sharp */ 36611ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 36621ea7e0e8SSarah Sharp { 36631ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 36641ea7e0e8SSarah Sharp unsigned long long u1_sel; 36651ea7e0e8SSarah Sharp unsigned long long u1_pel; 36661ea7e0e8SSarah Sharp unsigned long long u2_sel; 36671ea7e0e8SSarah Sharp unsigned long long u2_pel; 36681ea7e0e8SSarah Sharp int ret; 36691ea7e0e8SSarah Sharp 367038d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 367138d7f688SXenia Ragiadakou return 0; 367238d7f688SXenia Ragiadakou 36731ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 36741ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 36751ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 36761ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 36771ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 36781ea7e0e8SSarah Sharp 36791ea7e0e8SSarah Sharp /* 36801ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 36811ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 36821ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 36831ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 36841ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 36851ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 36861ea7e0e8SSarah Sharp */ 36871ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 36881ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 36891ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 36901ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 36911ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 36921ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 36931510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 36941ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 36951ea7e0e8SSarah Sharp return -EINVAL; 36961ea7e0e8SSarah Sharp } 36971ea7e0e8SSarah Sharp 36981ea7e0e8SSarah Sharp /* 36991ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 37001ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 37011ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 37021ea7e0e8SSarah Sharp */ 37031ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 37041ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 37051ea7e0e8SSarah Sharp 37061ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 37071ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 37081ea7e0e8SSarah Sharp 37091ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 37101ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 37111ea7e0e8SSarah Sharp 37121ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 37131ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 37141ea7e0e8SSarah Sharp 37151ea7e0e8SSarah Sharp /* 37161ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 37171ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 37181ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 37191ea7e0e8SSarah Sharp */ 37201ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 37211ea7e0e8SSarah Sharp if (!sel_values) 37221ea7e0e8SSarah Sharp return -ENOMEM; 37231ea7e0e8SSarah Sharp 37241ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 37251ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 37261ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 37271ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 37281ea7e0e8SSarah Sharp 37291ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37301ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 37311ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37321ea7e0e8SSarah Sharp 0, 0, 37331ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 37341ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37351ea7e0e8SSarah Sharp kfree(sel_values); 37361ea7e0e8SSarah Sharp return ret; 37371ea7e0e8SSarah Sharp } 37381ea7e0e8SSarah Sharp 37391ea7e0e8SSarah Sharp /* 37401ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 37411ea7e0e8SSarah Sharp */ 37421ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 37431ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 37441ea7e0e8SSarah Sharp { 37451ea7e0e8SSarah Sharp int ret; 37461ea7e0e8SSarah Sharp int feature; 37471ea7e0e8SSarah Sharp 37481ea7e0e8SSarah Sharp switch (state) { 37491ea7e0e8SSarah Sharp case USB3_LPM_U1: 37501ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 37511ea7e0e8SSarah Sharp break; 37521ea7e0e8SSarah Sharp case USB3_LPM_U2: 37531ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 37541ea7e0e8SSarah Sharp break; 37551ea7e0e8SSarah Sharp default: 37561ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 37571ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 37581ea7e0e8SSarah Sharp return -EINVAL; 37591ea7e0e8SSarah Sharp } 37601ea7e0e8SSarah Sharp 37611ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 37621ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 37631ea7e0e8SSarah Sharp "for unconfigured device.\n", 37641ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 37651ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37661ea7e0e8SSarah Sharp return 0; 37671ea7e0e8SSarah Sharp } 37681ea7e0e8SSarah Sharp 37691ea7e0e8SSarah Sharp if (enable) { 37701ea7e0e8SSarah Sharp /* 37711ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 37721ea7e0e8SSarah Sharp * for either U1 or U2. 37731ea7e0e8SSarah Sharp */ 37741ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37751ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 37761ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37771ea7e0e8SSarah Sharp feature, 37781ea7e0e8SSarah Sharp 0, NULL, 0, 37791ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37801ea7e0e8SSarah Sharp } else { 37811ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 37821ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 37831ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 37841ea7e0e8SSarah Sharp feature, 37851ea7e0e8SSarah Sharp 0, NULL, 0, 37861ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 37871ea7e0e8SSarah Sharp } 37881ea7e0e8SSarah Sharp if (ret < 0) { 37891ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 37901ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 37911ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37921ea7e0e8SSarah Sharp return -EBUSY; 37931ea7e0e8SSarah Sharp } 37941ea7e0e8SSarah Sharp return 0; 37951ea7e0e8SSarah Sharp } 37961ea7e0e8SSarah Sharp 37971ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 37981ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 37991ea7e0e8SSarah Sharp { 38001ea7e0e8SSarah Sharp int ret; 38011ea7e0e8SSarah Sharp int feature; 38021ea7e0e8SSarah Sharp 38031ea7e0e8SSarah Sharp switch (state) { 38041ea7e0e8SSarah Sharp case USB3_LPM_U1: 38051ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 38061ea7e0e8SSarah Sharp break; 38071ea7e0e8SSarah Sharp case USB3_LPM_U2: 38081ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 38091ea7e0e8SSarah Sharp break; 38101ea7e0e8SSarah Sharp default: 38111ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 38121ea7e0e8SSarah Sharp __func__); 38131ea7e0e8SSarah Sharp return -EINVAL; 38141ea7e0e8SSarah Sharp } 38151ea7e0e8SSarah Sharp 38161ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 38171ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 38181ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 38191ea7e0e8SSarah Sharp "which is a reserved value.\n", 38201ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 38211ea7e0e8SSarah Sharp return -EINVAL; 38221ea7e0e8SSarah Sharp } 38231ea7e0e8SSarah Sharp 38241ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 38251ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 38261ea7e0e8SSarah Sharp feature); 38271ea7e0e8SSarah Sharp if (ret < 0) { 38281ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 38291ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 38301ea7e0e8SSarah Sharp timeout, ret); 38311ea7e0e8SSarah Sharp return -EBUSY; 38321ea7e0e8SSarah Sharp } 38331ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 38341ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 38351ea7e0e8SSarah Sharp else 38361ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 38371ea7e0e8SSarah Sharp return 0; 38381ea7e0e8SSarah Sharp } 38391ea7e0e8SSarah Sharp 38401ea7e0e8SSarah Sharp /* 38411ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 38421ea7e0e8SSarah Sharp * U1/U2 entry. 38431ea7e0e8SSarah Sharp * 38441ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 38451ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 38461ea7e0e8SSarah Sharp * will be successful. 38471ea7e0e8SSarah Sharp * 38481ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 38491ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 38501ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 38511ea7e0e8SSarah Sharp */ 38521ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 38531ea7e0e8SSarah Sharp enum usb3_link_state state) 38541ea7e0e8SSarah Sharp { 385565a95b75SSarah Sharp int timeout, ret; 3856ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3857ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3858ae8963adSSarah Sharp 3859ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3860ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3861ae8963adSSarah Sharp * state. 3862ae8963adSSarah Sharp */ 3863ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3864ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3865ae8963adSSarah Sharp return; 38661ea7e0e8SSarah Sharp 386765a95b75SSarah Sharp /* 386865a95b75SSarah Sharp * First, let the device know about the exit latencies 386965a95b75SSarah Sharp * associated with the link state we're about to enable. 387065a95b75SSarah Sharp */ 387165a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 387265a95b75SSarah Sharp if (ret < 0) { 387365a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 387465a95b75SSarah Sharp usb3_lpm_names[state]); 387565a95b75SSarah Sharp return; 387665a95b75SSarah Sharp } 387765a95b75SSarah Sharp 38781ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 38791ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 38801ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 38811ea7e0e8SSarah Sharp * link state. 38821ea7e0e8SSarah Sharp */ 38831ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 38841ea7e0e8SSarah Sharp 38851ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 38861ea7e0e8SSarah Sharp if (timeout == 0) 38871ea7e0e8SSarah Sharp return; 38881ea7e0e8SSarah Sharp 38891ea7e0e8SSarah Sharp if (timeout < 0) { 38901ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 38911ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 38921ea7e0e8SSarah Sharp timeout); 38931ea7e0e8SSarah Sharp return; 38941ea7e0e8SSarah Sharp } 38951ea7e0e8SSarah Sharp 3896bf5ce5bfSLu Baolu if (usb_set_lpm_timeout(udev, state, timeout)) { 38971ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 38981ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 38991ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 39001ea7e0e8SSarah Sharp */ 39011ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 3902bf5ce5bfSLu Baolu } else { 3903bf5ce5bfSLu Baolu /* Only a configured device will accept the Set Feature 3904bf5ce5bfSLu Baolu * U1/U2_ENABLE 3905bf5ce5bfSLu Baolu */ 3906bf5ce5bfSLu Baolu if (udev->actconfig) 39071ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 39081ea7e0e8SSarah Sharp 3909bf5ce5bfSLu Baolu /* As soon as usb_set_lpm_timeout(timeout) returns 0, the 3910bf5ce5bfSLu Baolu * hub-initiated LPM is enabled. Thus, LPM is enabled no 3911bf5ce5bfSLu Baolu * matter the result of usb_set_device_initiated_lpm(). 3912bf5ce5bfSLu Baolu * The only difference is whether device is able to initiate 3913bf5ce5bfSLu Baolu * LPM. 3914bf5ce5bfSLu Baolu */ 3915bf5ce5bfSLu Baolu if (state == USB3_LPM_U1) 3916bf5ce5bfSLu Baolu udev->usb3_lpm_u1_enabled = 1; 3917bf5ce5bfSLu Baolu else if (state == USB3_LPM_U2) 3918bf5ce5bfSLu Baolu udev->usb3_lpm_u2_enabled = 1; 3919bf5ce5bfSLu Baolu } 39201ea7e0e8SSarah Sharp } 39211ea7e0e8SSarah Sharp 39221ea7e0e8SSarah Sharp /* 39231ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 39241ea7e0e8SSarah Sharp * U1/U2 entry. 39251ea7e0e8SSarah Sharp * 39261ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 39271ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 39281ea7e0e8SSarah Sharp * 39291ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 39301ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 39311ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 39321ea7e0e8SSarah Sharp * 39331ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 39341ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 39351ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 39361ea7e0e8SSarah Sharp */ 39371ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 39381ea7e0e8SSarah Sharp enum usb3_link_state state) 39391ea7e0e8SSarah Sharp { 39401ea7e0e8SSarah Sharp switch (state) { 39411ea7e0e8SSarah Sharp case USB3_LPM_U1: 39421ea7e0e8SSarah Sharp case USB3_LPM_U2: 39431ea7e0e8SSarah Sharp break; 39441ea7e0e8SSarah Sharp default: 39451ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 39461ea7e0e8SSarah Sharp __func__); 39471ea7e0e8SSarah Sharp return -EINVAL; 39481ea7e0e8SSarah Sharp } 39491ea7e0e8SSarah Sharp 39501ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 39511ea7e0e8SSarah Sharp return -EBUSY; 39521ea7e0e8SSarah Sharp 39531ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 39541ea7e0e8SSarah Sharp 39551ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 39561ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 39571ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 39581ea7e0e8SSarah Sharp usb3_lpm_names[state]); 3959bf5ce5bfSLu Baolu 3960bf5ce5bfSLu Baolu /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM 3961bf5ce5bfSLu Baolu * is disabled. Hub will disallows link to enter U1/U2 as well, 3962bf5ce5bfSLu Baolu * even device is initiating LPM. Hence LPM is disabled if hub LPM 3963bf5ce5bfSLu Baolu * timeout set to 0, no matter device-initiated LPM is disabled or 3964bf5ce5bfSLu Baolu * not. 3965bf5ce5bfSLu Baolu */ 3966bf5ce5bfSLu Baolu if (state == USB3_LPM_U1) 3967bf5ce5bfSLu Baolu udev->usb3_lpm_u1_enabled = 0; 3968bf5ce5bfSLu Baolu else if (state == USB3_LPM_U2) 3969bf5ce5bfSLu Baolu udev->usb3_lpm_u2_enabled = 0; 3970bf5ce5bfSLu Baolu 39711ea7e0e8SSarah Sharp return 0; 39721ea7e0e8SSarah Sharp } 39731ea7e0e8SSarah Sharp 39741ea7e0e8SSarah Sharp /* 39751ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 39761ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 39771ea7e0e8SSarah Sharp * 39781ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 39791ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 39801ea7e0e8SSarah Sharp */ 39811ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 39821ea7e0e8SSarah Sharp { 39831ea7e0e8SSarah Sharp struct usb_hcd *hcd; 39841ea7e0e8SSarah Sharp 39851ea7e0e8SSarah Sharp if (!udev || !udev->parent || 39868a1b2725SMathias Nyman udev->speed < USB_SPEED_SUPER || 398751df62ffSPratyush Anand !udev->lpm_capable || 398851df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 39891ea7e0e8SSarah Sharp return 0; 39901ea7e0e8SSarah Sharp 39911ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 39921ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 39931ea7e0e8SSarah Sharp return 0; 39941ea7e0e8SSarah Sharp 39951ea7e0e8SSarah Sharp udev->lpm_disable_count++; 399655558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 39971ea7e0e8SSarah Sharp return 0; 39981ea7e0e8SSarah Sharp 39991ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 40001ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 40011ea7e0e8SSarah Sharp goto enable_lpm; 40021ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 40031ea7e0e8SSarah Sharp goto enable_lpm; 40041ea7e0e8SSarah Sharp 40051ea7e0e8SSarah Sharp return 0; 40061ea7e0e8SSarah Sharp 40071ea7e0e8SSarah Sharp enable_lpm: 40081ea7e0e8SSarah Sharp usb_enable_lpm(udev); 40091ea7e0e8SSarah Sharp return -EBUSY; 40101ea7e0e8SSarah Sharp } 40111ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 40121ea7e0e8SSarah Sharp 40131ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 40141ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 40151ea7e0e8SSarah Sharp { 40161ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 40171ea7e0e8SSarah Sharp int ret; 40181ea7e0e8SSarah Sharp 40191ea7e0e8SSarah Sharp if (!hcd) 40201ea7e0e8SSarah Sharp return -EINVAL; 40211ea7e0e8SSarah Sharp 40221ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 40231ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 40241ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 40251ea7e0e8SSarah Sharp 40261ea7e0e8SSarah Sharp return ret; 40271ea7e0e8SSarah Sharp } 40281ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 40291ea7e0e8SSarah Sharp 40301ea7e0e8SSarah Sharp /* 40311ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 40321ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 40331ea7e0e8SSarah Sharp * 40341ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 40351ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 40361ea7e0e8SSarah Sharp * bandwidth_mutex. 40371ea7e0e8SSarah Sharp */ 40381ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 40391ea7e0e8SSarah Sharp { 40401ea7e0e8SSarah Sharp struct usb_hcd *hcd; 4041513072d9SLu Baolu struct usb_hub *hub; 4042513072d9SLu Baolu struct usb_port *port_dev; 40431ea7e0e8SSarah Sharp 40441ea7e0e8SSarah Sharp if (!udev || !udev->parent || 40458a1b2725SMathias Nyman udev->speed < USB_SPEED_SUPER || 404651df62ffSPratyush Anand !udev->lpm_capable || 404751df62ffSPratyush Anand udev->state < USB_STATE_DEFAULT) 40481ea7e0e8SSarah Sharp return; 40491ea7e0e8SSarah Sharp 40501ea7e0e8SSarah Sharp udev->lpm_disable_count--; 40511ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 40521ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 40531ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 40541ea7e0e8SSarah Sharp */ 40551ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 40561ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 40571ea7e0e8SSarah Sharp return; 40581ea7e0e8SSarah Sharp 40591ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 40601ea7e0e8SSarah Sharp return; 40611ea7e0e8SSarah Sharp 4062513072d9SLu Baolu hub = usb_hub_to_struct_hub(udev->parent); 4063513072d9SLu Baolu if (!hub) 4064513072d9SLu Baolu return; 4065513072d9SLu Baolu 4066513072d9SLu Baolu port_dev = hub->ports[udev->portnum - 1]; 4067513072d9SLu Baolu 4068513072d9SLu Baolu if (port_dev->usb3_lpm_u1_permit) 40691ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 4070513072d9SLu Baolu 4071513072d9SLu Baolu if (port_dev->usb3_lpm_u2_permit) 40721ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 40731ea7e0e8SSarah Sharp } 40741ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 40751ea7e0e8SSarah Sharp 40761ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 40771ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 40781ea7e0e8SSarah Sharp { 40791ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 40801ea7e0e8SSarah Sharp 40811ea7e0e8SSarah Sharp if (!hcd) 40821ea7e0e8SSarah Sharp return; 40831ea7e0e8SSarah Sharp 40841ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 40851ea7e0e8SSarah Sharp usb_enable_lpm(udev); 40861ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 40871ea7e0e8SSarah Sharp } 40881ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 40891ea7e0e8SSarah Sharp 409037be6676SMathias Nyman /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */ 409137be6676SMathias Nyman static void hub_usb3_port_prepare_disable(struct usb_hub *hub, 409237be6676SMathias Nyman struct usb_port *port_dev) 409337be6676SMathias Nyman { 409437be6676SMathias Nyman struct usb_device *udev = port_dev->child; 409537be6676SMathias Nyman int ret; 409637be6676SMathias Nyman 409737be6676SMathias Nyman if (udev && udev->port_is_suspended && udev->do_remote_wakeup) { 409837be6676SMathias Nyman ret = hub_set_port_link_state(hub, port_dev->portnum, 409937be6676SMathias Nyman USB_SS_PORT_LS_U0); 410037be6676SMathias Nyman if (!ret) { 410137be6676SMathias Nyman msleep(USB_RESUME_TIMEOUT); 410237be6676SMathias Nyman ret = usb_disable_remote_wakeup(udev); 410337be6676SMathias Nyman } 410437be6676SMathias Nyman if (ret) 410537be6676SMathias Nyman dev_warn(&udev->dev, 410637be6676SMathias Nyman "Port disable: can't disable remote wake\n"); 410737be6676SMathias Nyman udev->do_remote_wakeup = 0; 410837be6676SMathias Nyman } 410937be6676SMathias Nyman } 41101ea7e0e8SSarah Sharp 4111d388dab7SAlan Stern #else /* CONFIG_PM */ 4112d388dab7SAlan Stern 4113511366daSAndrew Morton #define hub_suspend NULL 4114511366daSAndrew Morton #define hub_resume NULL 4115f07600cfSAlan Stern #define hub_reset_resume NULL 41161ea7e0e8SSarah Sharp 411737be6676SMathias Nyman static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub, 411837be6676SMathias Nyman struct usb_port *port_dev) { } 411937be6676SMathias Nyman 41201ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 41211ea7e0e8SSarah Sharp { 41221ea7e0e8SSarah Sharp return 0; 41231ea7e0e8SSarah Sharp } 4124e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 41251ea7e0e8SSarah Sharp 41261ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 4127e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 41281ea7e0e8SSarah Sharp 41291ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 41301ea7e0e8SSarah Sharp { 41311ea7e0e8SSarah Sharp return 0; 41321ea7e0e8SSarah Sharp } 4133e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 41341ea7e0e8SSarah Sharp 41351ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 4136e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 4137f74631e3SSarah Sharp 4138f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 4139f74631e3SSarah Sharp { 4140f74631e3SSarah Sharp return 0; 4141f74631e3SSarah Sharp } 4142f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 4143f74631e3SSarah Sharp 4144f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 4145f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 4146c4b51a43SAlan Stern 41474a95b1fcSStephen Rothwell static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 41484a95b1fcSStephen Rothwell u16 portstatus, u16 portchange) 41494a95b1fcSStephen Rothwell { 41504a95b1fcSStephen Rothwell return 0; 41514a95b1fcSStephen Rothwell } 41524a95b1fcSStephen Rothwell 4153c4b51a43SAlan Stern #endif /* CONFIG_PM */ 4154d388dab7SAlan Stern 41553bc02bceSGeert Uytterhoeven /* 41563bc02bceSGeert Uytterhoeven * USB-3 does not have a similar link state as USB-2 that will avoid negotiating 41573bc02bceSGeert Uytterhoeven * a connection with a plugged-in cable but will signal the host when the cable 41583bc02bceSGeert Uytterhoeven * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices 41593bc02bceSGeert Uytterhoeven */ 41603bc02bceSGeert Uytterhoeven static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 41613bc02bceSGeert Uytterhoeven { 41623bc02bceSGeert Uytterhoeven struct usb_port *port_dev = hub->ports[port1 - 1]; 41633bc02bceSGeert Uytterhoeven struct usb_device *hdev = hub->hdev; 41643bc02bceSGeert Uytterhoeven int ret = 0; 41653bc02bceSGeert Uytterhoeven 41663bc02bceSGeert Uytterhoeven if (!hub->error) { 41673bc02bceSGeert Uytterhoeven if (hub_is_superspeed(hub->hdev)) { 41683bc02bceSGeert Uytterhoeven hub_usb3_port_prepare_disable(hub, port_dev); 41693bc02bceSGeert Uytterhoeven ret = hub_set_port_link_state(hub, port_dev->portnum, 41703bc02bceSGeert Uytterhoeven USB_SS_PORT_LS_U3); 41713bc02bceSGeert Uytterhoeven } else { 41723bc02bceSGeert Uytterhoeven ret = usb_clear_port_feature(hdev, port1, 41733bc02bceSGeert Uytterhoeven USB_PORT_FEAT_ENABLE); 41743bc02bceSGeert Uytterhoeven } 41753bc02bceSGeert Uytterhoeven } 41763bc02bceSGeert Uytterhoeven if (port_dev->child && set_state) 41773bc02bceSGeert Uytterhoeven usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); 41783bc02bceSGeert Uytterhoeven if (ret && ret != -ENODEV) 41793bc02bceSGeert Uytterhoeven dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); 41803bc02bceSGeert Uytterhoeven return ret; 41813bc02bceSGeert Uytterhoeven } 41823bc02bceSGeert Uytterhoeven 41831da177e4SLinus Torvalds 41841da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 41851da177e4SLinus Torvalds * 41861da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 41871da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 41881da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 41891da177e4SLinus Torvalds * 41901da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 41911da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 41921da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 41931da177e4SLinus Torvalds * 41941da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 41951da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 41961da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 41971da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 41981da177e4SLinus Torvalds */ 4199ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 42001da177e4SLinus Torvalds { 42011da177e4SLinus Torvalds int ret; 42021da177e4SLinus Torvalds u16 portchange, portstatus; 42031da177e4SLinus Torvalds unsigned connection = 0xffff; 4204d99f6b41SDan Williams int total_time, stable_time = 0; 4205d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 42061da177e4SLinus Torvalds 42071da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 42081da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 42091da177e4SLinus Torvalds if (ret < 0) 42101da177e4SLinus Torvalds return ret; 42111da177e4SLinus Torvalds 42121da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 42131da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 4214ad493e5eSLan Tianyu if (!must_be_connected || 4215ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 42161da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 42171da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 42181da177e4SLinus Torvalds break; 42191da177e4SLinus Torvalds } else { 42201da177e4SLinus Torvalds stable_time = 0; 42211da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 42221da177e4SLinus Torvalds } 42231da177e4SLinus Torvalds 42241da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4225ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 42261da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 42271da177e4SLinus Torvalds } 42281da177e4SLinus Torvalds 42291da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 42301da177e4SLinus Torvalds break; 42311da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 42321da177e4SLinus Torvalds } 42331da177e4SLinus Torvalds 4234d99f6b41SDan Williams dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", 4235d99f6b41SDan Williams total_time, stable_time, portstatus); 42361da177e4SLinus Torvalds 42371da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 42381da177e4SLinus Torvalds return -ETIMEDOUT; 42391da177e4SLinus Torvalds return portstatus; 42401da177e4SLinus Torvalds } 42411da177e4SLinus Torvalds 4242fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 42431da177e4SLinus Torvalds { 4244ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 4245ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 42462caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 42471da177e4SLinus Torvalds } 4248fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 42491da177e4SLinus Torvalds 42501da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 42511da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 42521da177e4SLinus Torvalds 42534326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 42541da177e4SLinus Torvalds { 42551da177e4SLinus Torvalds int retval; 4256c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 42571da177e4SLinus Torvalds 4258c6515272SSarah Sharp /* 4259c6515272SSarah Sharp * The host controller will choose the device address, 4260c6515272SSarah Sharp * instead of the core having chosen it earlier 4261c6515272SSarah Sharp */ 4262c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 42631da177e4SLinus Torvalds return -EINVAL; 42641da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 42651da177e4SLinus Torvalds return 0; 42661da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 42671da177e4SLinus Torvalds return -EINVAL; 4268c8d4af8eSAndiry Xu if (hcd->driver->address_device) 4269c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 4270c8d4af8eSAndiry Xu else 42711da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 42724326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 42731da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 42741da177e4SLinus Torvalds if (retval == 0) { 42753b29b68bSAlan Stern update_devnum(udev, devnum); 42764953d141SDavid Vrabel /* Device now using proper address. */ 42771da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 4278fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 42791da177e4SLinus Torvalds } 42801da177e4SLinus Torvalds return retval; 42811da177e4SLinus Torvalds } 42821da177e4SLinus Torvalds 4283890dae88SMathias Nyman /* 4284890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 4285890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 4286890dae88SMathias Nyman * enabled. 4287890dae88SMathias Nyman * 4288890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 4289890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 4290890dae88SMathias Nyman * support bit in the BOS descriptor. 4291890dae88SMathias Nyman */ 4292890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 4293890dae88SMathias Nyman { 4294d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 4295d99f6b41SDan Williams int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; 4296890dae88SMathias Nyman 42977b2db29fSGuenter Roeck if (!udev->usb2_hw_lpm_capable || !udev->bos) 4298890dae88SMathias Nyman return; 4299890dae88SMathias Nyman 4300d99f6b41SDan Williams if (hub) 4301d99f6b41SDan Williams connect_type = hub->ports[udev->portnum - 1]->connect_type; 4302890dae88SMathias Nyman 430323c05820SBjørn Mork if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || 4304890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 4305890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 4306890dae88SMathias Nyman usb_set_usb2_hardware_lpm(udev, 1); 4307890dae88SMathias Nyman } 4308890dae88SMathias Nyman } 4309890dae88SMathias Nyman 431048fc7dbdSDan Williams static int hub_enable_device(struct usb_device *udev) 431148fc7dbdSDan Williams { 431248fc7dbdSDan Williams struct usb_hcd *hcd = bus_to_hcd(udev->bus); 431348fc7dbdSDan Williams 431448fc7dbdSDan Williams if (!hcd->driver->enable_device) 431548fc7dbdSDan Williams return 0; 431648fc7dbdSDan Williams if (udev->state == USB_STATE_ADDRESS) 431748fc7dbdSDan Williams return 0; 431848fc7dbdSDan Williams if (udev->state != USB_STATE_DEFAULT) 431948fc7dbdSDan Williams return -EINVAL; 432048fc7dbdSDan Williams 432148fc7dbdSDan Williams return hcd->driver->enable_device(hcd, udev); 432248fc7dbdSDan Williams } 432348fc7dbdSDan Williams 43241da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 43251da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 43261da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 43271da177e4SLinus Torvalds * 43281da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 43295c79a1e3SDan Williams * usb_reset_and_verify_device), the caller must own the device lock and 43305c79a1e3SDan Williams * the port lock. For a newly detected device that is not accessible 43315c79a1e3SDan Williams * through any global pointers, it's not necessary to lock the device, 43325c79a1e3SDan Williams * but it is still necessary to lock the port. 43331da177e4SLinus Torvalds */ 43341da177e4SLinus Torvalds static int 43351da177e4SLinus Torvalds hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, 43361da177e4SLinus Torvalds int retry_counter) 43371da177e4SLinus Torvalds { 43381da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4339e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 43400d5ce778SOliver Neukum int retries, operations, retval, i; 43411da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 43421da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4343e538dfdaSMichal Nazarewicz const char *speed; 43444326ed0bSAlan Stern int devnum = udev->devnum; 43451bb90cf0SPeter Chen const char *driver_name; 43461da177e4SLinus Torvalds 43471da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 43481da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 43491da177e4SLinus Torvalds */ 43501da177e4SLinus Torvalds if (!hdev->parent) { 43511da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 43521da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 43531da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 43541da177e4SLinus Torvalds } 43551da177e4SLinus Torvalds 43561da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 43571da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 43581da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 43591da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 43601da177e4SLinus Torvalds 4361feb26ac3SChris Bainbridge mutex_lock(hcd->address0_mutex); 43621da177e4SLinus Torvalds 43631da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4364e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 436575d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 43661da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 43671da177e4SLinus Torvalds goto fail; 43681da177e4SLinus Torvalds /* success, speed is known */ 436907194ab7SLuben Tuikov 43701da177e4SLinus Torvalds retval = -ENODEV; 43711da177e4SLinus Torvalds 43728a1b2725SMathias Nyman /* Don't allow speed changes at reset, except usb 3.0 to faster */ 43738a1b2725SMathias Nyman if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && 43748a1b2725SMathias Nyman !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { 43751da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 43761da177e4SLinus Torvalds goto fail; 43771da177e4SLinus Torvalds } 43781da177e4SLinus Torvalds oldspeed = udev->speed; 43791da177e4SLinus Torvalds 43801da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 43811da177e4SLinus Torvalds * it's fixed size except for full speed devices. 43825bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 43835bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 43841da177e4SLinus Torvalds */ 43851da177e4SLinus Torvalds switch (udev->speed) { 43868a1b2725SMathias Nyman case USB_SPEED_SUPER_PLUS: 43876b403b02SSarah Sharp case USB_SPEED_SUPER: 4388551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4389551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 43905bb6e0aeSInaky Perez-Gonzalez break; 43911da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4392551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 43931da177e4SLinus Torvalds break; 43941da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 43951da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 43961da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 43971da177e4SLinus Torvalds * then correct our initial guess. 43981da177e4SLinus Torvalds */ 4399551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 44001da177e4SLinus Torvalds break; 44011da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4402551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 44031da177e4SLinus Torvalds break; 44041da177e4SLinus Torvalds default: 44051da177e4SLinus Torvalds goto fail; 44061da177e4SLinus Torvalds } 44071da177e4SLinus Torvalds 4408e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4409e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4410e538dfdaSMichal Nazarewicz else 4411e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4412e538dfdaSMichal Nazarewicz 44131bb90cf0SPeter Chen /* 44141bb90cf0SPeter Chen * The controller driver may be NULL if the controller device 44151bb90cf0SPeter Chen * is the middle device between platform device and roothub. 44161bb90cf0SPeter Chen * This middle device may not need a device driver due to 44171bb90cf0SPeter Chen * all hardware control can be at platform device driver, this 44181bb90cf0SPeter Chen * platform device is usually a dual-role USB controller device. 44191bb90cf0SPeter Chen */ 44201bb90cf0SPeter Chen if (udev->bus->controller->driver) 44211bb90cf0SPeter Chen driver_name = udev->bus->controller->driver->name; 44221bb90cf0SPeter Chen else 44231bb90cf0SPeter Chen driver_name = udev->bus->sysdev->driver->name; 44241bb90cf0SPeter Chen 44258a1b2725SMathias Nyman if (udev->speed < USB_SPEED_SUPER) 442683a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4427e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4428e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 44291bb90cf0SPeter Chen devnum, driver_name); 44301da177e4SLinus Torvalds 44311da177e4SLinus Torvalds /* Set up TT records, if needed */ 44321da177e4SLinus Torvalds if (hdev->tt) { 44331da177e4SLinus Torvalds udev->tt = hdev->tt; 44341da177e4SLinus Torvalds udev->ttport = hdev->ttport; 44351da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 44361da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4437d199c96dSAlan Stern if (!hub->tt.hub) { 4438d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4439d199c96dSAlan Stern retval = -EINVAL; 4440d199c96dSAlan Stern goto fail; 4441d199c96dSAlan Stern } 44421da177e4SLinus Torvalds udev->tt = &hub->tt; 44431da177e4SLinus Torvalds udev->ttport = port1; 44441da177e4SLinus Torvalds } 44451da177e4SLinus Torvalds 44461da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 44471da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 44481da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 44491da177e4SLinus Torvalds * Change it cautiously. 44501da177e4SLinus Torvalds * 445148fc7dbdSDan Williams * NOTE: If use_new_scheme() is true we will start by issuing 44521da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 44531da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 44541da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 44551da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 44561da177e4SLinus Torvalds * value. 44571da177e4SLinus Torvalds */ 44580d5ce778SOliver Neukum for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { 445948fc7dbdSDan Williams bool did_new_scheme = false; 446048fc7dbdSDan Williams 446148fc7dbdSDan Williams if (use_new_scheme(udev, retry_counter)) { 44621da177e4SLinus Torvalds struct usb_device_descriptor *buf; 44631da177e4SLinus Torvalds int r = 0; 44641da177e4SLinus Torvalds 446548fc7dbdSDan Williams did_new_scheme = true; 446648fc7dbdSDan Williams retval = hub_enable_device(udev); 4467938569ebSOliver Neukum if (retval < 0) { 4468938569ebSOliver Neukum dev_err(&udev->dev, 4469938569ebSOliver Neukum "hub failed to enable device, error %d\n", 4470938569ebSOliver Neukum retval); 447148fc7dbdSDan Williams goto fail; 4472938569ebSOliver Neukum } 447348fc7dbdSDan Williams 44741da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 44751da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 44761da177e4SLinus Torvalds if (!buf) { 44771da177e4SLinus Torvalds retval = -ENOMEM; 44781da177e4SLinus Torvalds continue; 44791da177e4SLinus Torvalds } 44801da177e4SLinus Torvalds 4481b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4482b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4483b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 44841da177e4SLinus Torvalds */ 44850d5ce778SOliver Neukum for (operations = 0; operations < 3; ++operations) { 44861da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 44871da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 44881da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 44891da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 44901da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4491fd7c519dSJaroslav Kysela initial_descriptor_timeout); 44921da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 44935bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 44941da177e4SLinus Torvalds if (buf->bDescriptorType == 44951da177e4SLinus Torvalds USB_DT_DEVICE) { 44961da177e4SLinus Torvalds r = 0; 44971da177e4SLinus Torvalds break; 44981da177e4SLinus Torvalds } 44991da177e4SLinus Torvalds /* FALL THROUGH */ 45001da177e4SLinus Torvalds default: 45011da177e4SLinus Torvalds if (r == 0) 45021da177e4SLinus Torvalds r = -EPROTO; 45031da177e4SLinus Torvalds break; 45041da177e4SLinus Torvalds } 4505264904ccSOliver Neukum /* 4506264904ccSOliver Neukum * Some devices time out if they are powered on 4507264904ccSOliver Neukum * when already connected. They need a second 4508264904ccSOliver Neukum * reset. But only on the first attempt, 4509264904ccSOliver Neukum * lest we get into a time out/reset loop 4510264904ccSOliver Neukum */ 45110d5ce778SOliver Neukum if (r == 0 || (r == -ETIMEDOUT && retries == 0)) 45121da177e4SLinus Torvalds break; 45131da177e4SLinus Torvalds } 45141da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 45151da177e4SLinus Torvalds buf->bMaxPacketSize0; 45161da177e4SLinus Torvalds kfree(buf); 45171da177e4SLinus Torvalds 451875d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 45191da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 45201da177e4SLinus Torvalds goto fail; 45211da177e4SLinus Torvalds if (oldspeed != udev->speed) { 45221da177e4SLinus Torvalds dev_dbg(&udev->dev, 45231da177e4SLinus Torvalds "device reset changed speed!\n"); 45241da177e4SLinus Torvalds retval = -ENODEV; 45251da177e4SLinus Torvalds goto fail; 45261da177e4SLinus Torvalds } 45271da177e4SLinus Torvalds if (r) { 4528e9e88fb7SAlan Stern if (r != -ENODEV) 4529e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4530b9cef6c3SWu Fengguang r); 45311da177e4SLinus Torvalds retval = -EMSGSIZE; 45321da177e4SLinus Torvalds continue; 45331da177e4SLinus Torvalds } 45341da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 45351da177e4SLinus Torvalds } 45361da177e4SLinus Torvalds 45376c529cdcSInaky Perez-Gonzalez /* 45386c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 45396c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 45406c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 45416c529cdcSInaky Perez-Gonzalez */ 45426c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 45430d5ce778SOliver Neukum for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { 45444326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 45451da177e4SLinus Torvalds if (retval >= 0) 45461da177e4SLinus Torvalds break; 45471da177e4SLinus Torvalds msleep(200); 45481da177e4SLinus Torvalds } 45491da177e4SLinus Torvalds if (retval < 0) { 4550e9e88fb7SAlan Stern if (retval != -ENODEV) 4551e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 45524326ed0bSAlan Stern devnum, retval); 45531da177e4SLinus Torvalds goto fail; 45541da177e4SLinus Torvalds } 45558a1b2725SMathias Nyman if (udev->speed >= USB_SPEED_SUPER) { 4556c6515272SSarah Sharp devnum = udev->devnum; 4557c6515272SSarah Sharp dev_info(&udev->dev, 45588a1b2725SMathias Nyman "%s SuperSpeed%s USB device number %d using %s\n", 4559c6515272SSarah Sharp (udev->config) ? "reset" : "new", 45608a1b2725SMathias Nyman (udev->speed == USB_SPEED_SUPER_PLUS) ? "Plus" : "", 45611bb90cf0SPeter Chen devnum, driver_name); 4562c6515272SSarah Sharp } 45631da177e4SLinus Torvalds 45641da177e4SLinus Torvalds /* cope with hardware quirkiness: 45651da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 45661da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 45671da177e4SLinus Torvalds */ 45681da177e4SLinus Torvalds msleep(10); 456948fc7dbdSDan Williams /* use_new_scheme() checks the speed which may have 457048fc7dbdSDan Williams * changed since the initial look so we cache the result 457148fc7dbdSDan Williams * in did_new_scheme 457248fc7dbdSDan Williams */ 457348fc7dbdSDan Williams if (did_new_scheme) 45741da177e4SLinus Torvalds break; 45756c529cdcSInaky Perez-Gonzalez } 45761da177e4SLinus Torvalds 45771da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 45781da177e4SLinus Torvalds if (retval < 8) { 4579e9e88fb7SAlan Stern if (retval != -ENODEV) 4580b9cef6c3SWu Fengguang dev_err(&udev->dev, 4581b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4582b9cef6c3SWu Fengguang retval); 45831da177e4SLinus Torvalds if (retval >= 0) 45841da177e4SLinus Torvalds retval = -EMSGSIZE; 45851da177e4SLinus Torvalds } else { 45861da177e4SLinus Torvalds retval = 0; 45871da177e4SLinus Torvalds break; 45881da177e4SLinus Torvalds } 45891da177e4SLinus Torvalds } 45901da177e4SLinus Torvalds if (retval) 45911da177e4SLinus Torvalds goto fail; 45921da177e4SLinus Torvalds 4593d8aec3dbSElric Fu /* 4594d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4595d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4596d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4597d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4598d8aec3dbSElric Fu */ 45998a1b2725SMathias Nyman if ((udev->speed >= USB_SPEED_SUPER) && 4600d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4601d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4602d8aec3dbSElric Fu "warm reset device\n"); 4603d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4604d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4605d8aec3dbSElric Fu retval = -EINVAL; 4606d8aec3dbSElric Fu goto fail; 4607d8aec3dbSElric Fu } 4608d8aec3dbSElric Fu 46096b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 46108a1b2725SMathias Nyman udev->speed >= USB_SPEED_SUPER) 46116b403b02SSarah Sharp i = 512; 46126b403b02SSarah Sharp else 46136b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 461429cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 461556626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 46161da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 461756626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 46181da177e4SLinus Torvalds retval = -EMSGSIZE; 46191da177e4SLinus Torvalds goto fail; 46201da177e4SLinus Torvalds } 462156626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 46221da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 462356626a72SAlan Stern else 462456626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 46251da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4626fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 46271da177e4SLinus Torvalds } 46281da177e4SLinus Torvalds 46291da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 46301da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4631e9e88fb7SAlan Stern if (retval != -ENODEV) 4632b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4633b9cef6c3SWu Fengguang retval); 46341da177e4SLinus Torvalds if (retval >= 0) 46351da177e4SLinus Torvalds retval = -ENOMSG; 46361da177e4SLinus Torvalds goto fail; 46371da177e4SLinus Torvalds } 46381da177e4SLinus Torvalds 4639ad87e032SAlan Stern usb_detect_quirks(udev); 4640ad87e032SAlan Stern 46411ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 46421ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 464351e0a012SSarah Sharp if (!retval) { 4644d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 464551e0a012SSarah Sharp usb_set_lpm_parameters(udev); 464651e0a012SSarah Sharp } 46471ff4df56SAndiry Xu } 46483148bf04SAndiry Xu 46491da177e4SLinus Torvalds retval = 0; 465048f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 465148f24970SAlek Du if (hcd->driver->update_device) 465248f24970SAlek Du hcd->driver->update_device(hcd, udev); 4653890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 46541da177e4SLinus Torvalds fail: 46554326ed0bSAlan Stern if (retval) { 46561da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 46573b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 46584326ed0bSAlan Stern } 4659feb26ac3SChris Bainbridge mutex_unlock(hcd->address0_mutex); 46601da177e4SLinus Torvalds return retval; 46611da177e4SLinus Torvalds } 46621da177e4SLinus Torvalds 46631da177e4SLinus Torvalds static void 46641da177e4SLinus Torvalds check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) 46651da177e4SLinus Torvalds { 46661da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 46671da177e4SLinus Torvalds int status; 46681da177e4SLinus Torvalds 46692a159389SJohan Hovold if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) 46702a159389SJohan Hovold return; 46712a159389SJohan Hovold 4672e94b1766SChristoph Lameter qual = kmalloc(sizeof *qual, GFP_KERNEL); 46731da177e4SLinus Torvalds if (qual == NULL) 46741da177e4SLinus Torvalds return; 46751da177e4SLinus Torvalds 46761da177e4SLinus Torvalds status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, 46771da177e4SLinus Torvalds qual, sizeof *qual); 46781da177e4SLinus Torvalds if (status == sizeof *qual) { 46791da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 46801da177e4SLinus Torvalds "connect to a high speed hub\n"); 46811da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 46821da177e4SLinus Torvalds if (hub->has_indicators) { 46831da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 468422f6a0f0SShaibal Dutta queue_delayed_work(system_power_efficient_wq, 468522f6a0f0SShaibal Dutta &hub->leds, 0); 46861da177e4SLinus Torvalds } 46871da177e4SLinus Torvalds } 46881da177e4SLinus Torvalds kfree(qual); 46891da177e4SLinus Torvalds } 46901da177e4SLinus Torvalds 46911da177e4SLinus Torvalds static unsigned 46921da177e4SLinus Torvalds hub_power_remaining(struct usb_hub *hub) 46931da177e4SLinus Torvalds { 46941da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 46951da177e4SLinus Torvalds int remaining; 469655c52718SAlan Stern int port1; 46971da177e4SLinus Torvalds 469855c52718SAlan Stern if (!hub->limited_power) 46991da177e4SLinus Torvalds return 0; 47001da177e4SLinus Torvalds 470155c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 470255c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4703d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4704d99f6b41SDan Williams struct usb_device *udev = port_dev->child; 4705430ee58eSSebastian Andrzej Siewior unsigned unit_load; 4706d99f6b41SDan Williams int delta; 47071da177e4SLinus Torvalds 47081da177e4SLinus Torvalds if (!udev) 47091da177e4SLinus Torvalds continue; 4710430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4711430ee58eSSebastian Andrzej Siewior unit_load = 150; 4712430ee58eSSebastian Andrzej Siewior else 4713430ee58eSSebastian Andrzej Siewior unit_load = 100; 47141da177e4SLinus Torvalds 4715430ee58eSSebastian Andrzej Siewior /* 4716430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4717430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4718430ee58eSSebastian Andrzej Siewior */ 47191da177e4SLinus Torvalds if (udev->actconfig) 47208d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 472155c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4722430ee58eSSebastian Andrzej Siewior delta = unit_load; 47231da177e4SLinus Torvalds else 472455c52718SAlan Stern delta = 8; 472555c52718SAlan Stern if (delta > hub->mA_per_port) 4726d99f6b41SDan Williams dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", 4727d99f6b41SDan Williams delta, hub->mA_per_port); 47281da177e4SLinus Torvalds remaining -= delta; 47291da177e4SLinus Torvalds } 47301da177e4SLinus Torvalds if (remaining < 0) { 473155c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 473255c52718SAlan Stern -remaining); 47331da177e4SLinus Torvalds remaining = 0; 47341da177e4SLinus Torvalds } 47351da177e4SLinus Torvalds return remaining; 47361da177e4SLinus Torvalds } 47371da177e4SLinus Torvalds 4738af376a46SDan Williams static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, 4739af376a46SDan Williams u16 portchange) 47401da177e4SLinus Torvalds { 474194c43b98SAlan Stern int status = -ENODEV; 474294c43b98SAlan Stern int i; 4743430ee58eSSebastian Andrzej Siewior unsigned unit_load; 47441da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 47451da177e4SLinus Torvalds struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 4746d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4747af376a46SDan Williams struct usb_device *udev = port_dev->child; 47485ee0f803SOliver Neukum static int unreliable_port = -1; 47498808f00cSAlan Stern 475024618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4751b76baa81SPeter Chen if (udev) { 4752b2108f1eSPeter Chen if (hcd->usb_phy && !hdev->parent) 47533d46e73dSAntoine Tenart usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); 4754d99f6b41SDan Williams usb_disconnect(&port_dev->child); 4755b76baa81SPeter Chen } 475624618b0cSAlan Stern 4757253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4758253e0572SAlan Stern * disconnect or the connect status changes. 4759253e0572SAlan Stern */ 4760253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4761253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4762253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4763253e0572SAlan Stern 47645257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 47655257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4766ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 47675257d97aSAlan Stern if (status < 0) { 47685ee0f803SOliver Neukum if (status != -ENODEV && 47695ee0f803SOliver Neukum port1 != unreliable_port && 47705ee0f803SOliver Neukum printk_ratelimit()) 4771dd5f5006STakashi Iwai dev_err(&port_dev->dev, "connect-debounce failed\n"); 47725257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 47735ee0f803SOliver Neukum unreliable_port = port1; 47745257d97aSAlan Stern } else { 47755257d97aSAlan Stern portstatus = status; 47765257d97aSAlan Stern } 47775257d97aSAlan Stern } 47785257d97aSAlan Stern 4779253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4780253e0572SAlan Stern * the device was "removed". 4781253e0572SAlan Stern */ 4782253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4783253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 47841da177e4SLinus Torvalds 4785fbaecff0SDeepak Das /* 4786fbaecff0SDeepak Das * maybe switch power back on (e.g. root hub was reset) 4787fbaecff0SDeepak Das * but only if the port isn't owned by someone else. 4788fbaecff0SDeepak Das */ 47899262c19dSDan Williams if (hub_is_port_power_switchable(hub) 4790fbaecff0SDeepak Das && !port_is_power_on(hub, portstatus) 4791fbaecff0SDeepak Das && !port_dev->port_owner) 47921da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 47931da177e4SLinus Torvalds 47941da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 47951da177e4SLinus Torvalds goto done; 47961da177e4SLinus Torvalds return; 47971da177e4SLinus Torvalds } 4798430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4799430ee58eSSebastian Andrzej Siewior unit_load = 150; 4800430ee58eSSebastian Andrzej Siewior else 4801430ee58eSSebastian Andrzej Siewior unit_load = 100; 48021da177e4SLinus Torvalds 4803e9e88fb7SAlan Stern status = 0; 48041da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 48051da177e4SLinus Torvalds 48061da177e4SLinus Torvalds /* reallocate for each attempt, since references 48071da177e4SLinus Torvalds * to the previous one can escape in various ways 48081da177e4SLinus Torvalds */ 48091da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 48101da177e4SLinus Torvalds if (!udev) { 4811d99f6b41SDan Williams dev_err(&port_dev->dev, 4812d99f6b41SDan Williams "couldn't allocate usb_device\n"); 48131da177e4SLinus Torvalds goto done; 48141da177e4SLinus Torvalds } 48151da177e4SLinus Torvalds 48161da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 481755c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4818b6956ffaSAlan Stern udev->level = hdev->level + 1; 48198af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 48201da177e4SLinus Torvalds 48218a1b2725SMathias Nyman /* Devices connected to SuperSpeed hubs are USB 3.0 or later */ 4822131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4823e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4824e7b77172SSarah Sharp else 4825e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4826e7b77172SSarah Sharp 48273b29b68bSAlan Stern choose_devnum(udev); 4828c6515272SSarah Sharp if (udev->devnum <= 0) { 4829c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4830c6515272SSarah Sharp goto loop; 4831c6515272SSarah Sharp } 4832c6515272SSarah Sharp 4833e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 48345c79a1e3SDan Williams usb_lock_port(port_dev); 48351da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 48365c79a1e3SDan Williams usb_unlock_port(port_dev); 48371da177e4SLinus Torvalds if (status < 0) 48381da177e4SLinus Torvalds goto loop; 48391da177e4SLinus Torvalds 484093362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 4841b2a542bbSDmitry Fleytman msleep(2000); 484293362a87SPhil Dibowitz 48431da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 48441da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 48451da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 48461da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 48471da177e4SLinus Torvalds * on the parent. 48481da177e4SLinus Torvalds */ 48491da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4850430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 48511da177e4SLinus Torvalds u16 devstat; 48521da177e4SLinus Torvalds 48531da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 48541da177e4SLinus Torvalds &devstat); 485515b7336eSAlan Stern if (status) { 48561da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 48571da177e4SLinus Torvalds goto loop_disable; 48581da177e4SLinus Torvalds } 48591da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 48601da177e4SLinus Torvalds dev_err(&udev->dev, 48611da177e4SLinus Torvalds "can't connect bus-powered hub " 48621da177e4SLinus Torvalds "to this port\n"); 48631da177e4SLinus Torvalds if (hub->has_indicators) { 48641da177e4SLinus Torvalds hub->indicator[port1-1] = 48651da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 486622f6a0f0SShaibal Dutta queue_delayed_work( 486722f6a0f0SShaibal Dutta system_power_efficient_wq, 486822f6a0f0SShaibal Dutta &hub->leds, 0); 48691da177e4SLinus Torvalds } 48701da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 48711da177e4SLinus Torvalds goto loop_disable; 48721da177e4SLinus Torvalds } 48731da177e4SLinus Torvalds } 48741da177e4SLinus Torvalds 48751da177e4SLinus Torvalds /* check for devices running slower than they could */ 48761da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 48771da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 48781da177e4SLinus Torvalds && highspeed_hubs != 0) 48791da177e4SLinus Torvalds check_highspeed(hub, udev, port1); 48801da177e4SLinus Torvalds 4881fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 48821da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 48831da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 48841da177e4SLinus Torvalds */ 48851da177e4SLinus Torvalds status = 0; 48861da177e4SLinus Torvalds 4887d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 4888d8521afeSDan Williams 48891da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 48901da177e4SLinus Torvalds * been disconnected; we would race with the 48911da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 48921da177e4SLinus Torvalds */ 48931da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 48941da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 48951da177e4SLinus Torvalds status = -ENOTCONN; 48961da177e4SLinus Torvalds else 4897d99f6b41SDan Williams port_dev->child = udev; 48981da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4899d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 49001da177e4SLinus Torvalds 49011da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 49021da177e4SLinus Torvalds if (!status) { 49031da177e4SLinus Torvalds status = usb_new_device(udev); 49041da177e4SLinus Torvalds if (status) { 4905d8521afeSDan Williams mutex_lock(&usb_port_peer_mutex); 49061da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4907d99f6b41SDan Williams port_dev->child = NULL; 49081da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 4909d8521afeSDan Williams mutex_unlock(&usb_port_peer_mutex); 491001ed67dcSTony Zheng } else { 491101ed67dcSTony Zheng if (hcd->usb_phy && !hdev->parent) 491201ed67dcSTony Zheng usb_phy_notify_connect(hcd->usb_phy, 491301ed67dcSTony Zheng udev->speed); 49141da177e4SLinus Torvalds } 49151da177e4SLinus Torvalds } 49161da177e4SLinus Torvalds 49171da177e4SLinus Torvalds if (status) 49181da177e4SLinus Torvalds goto loop_disable; 49191da177e4SLinus Torvalds 49201da177e4SLinus Torvalds status = hub_power_remaining(hub); 49211da177e4SLinus Torvalds if (status) 4922d99f6b41SDan Williams dev_dbg(hub->intfdev, "%dmA power budget left\n", status); 49231da177e4SLinus Torvalds 49241da177e4SLinus Torvalds return; 49251da177e4SLinus Torvalds 49261da177e4SLinus Torvalds loop_disable: 49271da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 49281da177e4SLinus Torvalds loop: 4929fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 49303b29b68bSAlan Stern release_devnum(udev); 4931f7410cedSHerbert Xu hub_free_dev(udev); 49321da177e4SLinus Torvalds usb_put_dev(udev); 4933ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 49341da177e4SLinus Torvalds break; 49351da177e4SLinus Torvalds } 49363a31155cSAlan Stern if (hub->hdev->parent || 49373a31155cSAlan Stern !hcd->driver->port_handed_over || 4938e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4939e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 4940d99f6b41SDan Williams dev_err(&port_dev->dev, 4941d99f6b41SDan Williams "unable to enumerate USB device\n"); 4942e9e88fb7SAlan Stern } 49431da177e4SLinus Torvalds 49441da177e4SLinus Torvalds done: 49451da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 494694c43b98SAlan Stern if (hcd->driver->relinquish_port && !hub->hdev->parent) { 494794c43b98SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 494890da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 494994c43b98SAlan Stern } 49501da177e4SLinus Torvalds } 49511da177e4SLinus Torvalds 4952af376a46SDan Williams /* Handle physical or logical connection change events. 4953af376a46SDan Williams * This routine is called when: 4954af376a46SDan Williams * a port connection-change occurs; 4955af376a46SDan Williams * a port enable-change occurs (often caused by EMI); 4956af376a46SDan Williams * usb_reset_and_verify_device() encounters changed descriptors (as from 4957af376a46SDan Williams * a firmware download) 4958af376a46SDan Williams * caller already locked the hub 4959af376a46SDan Williams */ 4960af376a46SDan Williams static void hub_port_connect_change(struct usb_hub *hub, int port1, 496172937e1eSSarah Sharp u16 portstatus, u16 portchange) 49625c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 4963714b07beSSarah Sharp { 4964af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 4965af376a46SDan Williams struct usb_device *udev = port_dev->child; 4966af376a46SDan Williams int status = -ENODEV; 4967714b07beSSarah Sharp 4968af376a46SDan Williams dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, 4969af376a46SDan Williams portchange, portspeed(hub, portstatus)); 4970af376a46SDan Williams 4971af376a46SDan Williams if (hub->has_indicators) { 4972af376a46SDan Williams set_port_led(hub, port1, HUB_LED_AUTO); 4973af376a46SDan Williams hub->indicator[port1-1] = INDICATOR_AUTO; 49744ee823b8SSarah Sharp } 4975714b07beSSarah Sharp 4976af376a46SDan Williams #ifdef CONFIG_USB_OTG 4977af376a46SDan Williams /* during HNP, don't repeat the debounce */ 4978af376a46SDan Williams if (hub->hdev->bus->is_b_host) 4979af376a46SDan Williams portchange &= ~(USB_PORT_STAT_C_CONNECTION | 4980af376a46SDan Williams USB_PORT_STAT_C_ENABLE); 4981af376a46SDan Williams #endif 4982714b07beSSarah Sharp 4983af376a46SDan Williams /* Try to resuscitate an existing device */ 4984af376a46SDan Williams if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 4985af376a46SDan Williams udev->state != USB_STATE_NOTATTACHED) { 4986af376a46SDan Williams if (portstatus & USB_PORT_STAT_ENABLE) { 4987af376a46SDan Williams status = 0; /* Nothing to do */ 4988ceb6c9c8SRafael J. Wysocki #ifdef CONFIG_PM 4989af376a46SDan Williams } else if (udev->state == USB_STATE_SUSPENDED && 4990af376a46SDan Williams udev->persist_enabled) { 4991af376a46SDan Williams /* For a suspended device, treat this as a 4992af376a46SDan Williams * remote wakeup event. 4993af376a46SDan Williams */ 49945c79a1e3SDan Williams usb_unlock_port(port_dev); 4995af376a46SDan Williams status = usb_remote_wakeup(udev); 49965c79a1e3SDan Williams usb_lock_port(port_dev); 4997af376a46SDan Williams #endif 4998af376a46SDan Williams } else { 4999af376a46SDan Williams /* Don't resuscitate */; 5000af376a46SDan Williams } 5001af376a46SDan Williams } 5002af376a46SDan Williams clear_bit(port1, hub->change_bits); 5003af376a46SDan Williams 50045c79a1e3SDan Williams /* successfully revalidated the connection */ 5005af376a46SDan Williams if (status == 0) 5006af376a46SDan Williams return; 5007af376a46SDan Williams 50085c79a1e3SDan Williams usb_unlock_port(port_dev); 5009af376a46SDan Williams hub_port_connect(hub, port1, portstatus, portchange); 50105c79a1e3SDan Williams usb_lock_port(port_dev); 50111da177e4SLinus Torvalds } 50121da177e4SLinus Torvalds 5013af376a46SDan Williams static void port_event(struct usb_hub *hub, int port1) 50145c79a1e3SDan Williams __must_hold(&port_dev->status_lock) 5015af376a46SDan Williams { 50167671bd1eSZhuang Jin Can int connect_change; 5017af376a46SDan Williams struct usb_port *port_dev = hub->ports[port1 - 1]; 5018af376a46SDan Williams struct usb_device *udev = port_dev->child; 5019af376a46SDan Williams struct usb_device *hdev = hub->hdev; 5020af376a46SDan Williams u16 portstatus, portchange; 5021af376a46SDan Williams 5022af376a46SDan Williams connect_change = test_bit(port1, hub->change_bits); 5023af376a46SDan Williams clear_bit(port1, hub->event_bits); 5024af376a46SDan Williams clear_bit(port1, hub->wakeup_bits); 5025af376a46SDan Williams 5026af376a46SDan Williams if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) 5027af376a46SDan Williams return; 5028af376a46SDan Williams 5029af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONNECTION) { 5030af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); 5031714b07beSSarah Sharp connect_change = 1; 5032714b07beSSarah Sharp } 5033af376a46SDan Williams 5034af376a46SDan Williams if (portchange & USB_PORT_STAT_C_ENABLE) { 5035af376a46SDan Williams if (!connect_change) 5036af376a46SDan Williams dev_dbg(&port_dev->dev, "enable change, status %08x\n", 5037af376a46SDan Williams portstatus); 5038af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); 5039af376a46SDan Williams 5040af376a46SDan Williams /* 5041af376a46SDan Williams * EM interference sometimes causes badly shielded USB devices 5042af376a46SDan Williams * to be shutdown by the hub, this hack enables them again. 5043af376a46SDan Williams * Works at least with mouse driver. 5044af376a46SDan Williams */ 5045af376a46SDan Williams if (!(portstatus & USB_PORT_STAT_ENABLE) 5046af376a46SDan Williams && !connect_change && udev) { 5047af376a46SDan Williams dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); 5048af376a46SDan Williams connect_change = 1; 5049714b07beSSarah Sharp } 5050af376a46SDan Williams } 5051af376a46SDan Williams 5052af376a46SDan Williams if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 5053af376a46SDan Williams u16 status = 0, unused; 5054af376a46SDan Williams 5055af376a46SDan Williams dev_dbg(&port_dev->dev, "over-current change\n"); 5056af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5057af376a46SDan Williams USB_PORT_FEAT_C_OVER_CURRENT); 5058af376a46SDan Williams msleep(100); /* Cool down */ 5059af376a46SDan Williams hub_power_on(hub, true); 5060af376a46SDan Williams hub_port_status(hub, port1, &status, &unused); 5061af376a46SDan Williams if (status & USB_PORT_STAT_OVERCURRENT) 5062af376a46SDan Williams dev_err(&port_dev->dev, "over-current condition\n"); 5063af376a46SDan Williams } 5064af376a46SDan Williams 5065af376a46SDan Williams if (portchange & USB_PORT_STAT_C_RESET) { 5066af376a46SDan Williams dev_dbg(&port_dev->dev, "reset change\n"); 5067af376a46SDan Williams usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); 5068af376a46SDan Williams } 5069af376a46SDan Williams if ((portchange & USB_PORT_STAT_C_BH_RESET) 5070af376a46SDan Williams && hub_is_superspeed(hdev)) { 5071af376a46SDan Williams dev_dbg(&port_dev->dev, "warm reset change\n"); 5072af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5073af376a46SDan Williams USB_PORT_FEAT_C_BH_PORT_RESET); 5074af376a46SDan Williams } 5075af376a46SDan Williams if (portchange & USB_PORT_STAT_C_LINK_STATE) { 5076af376a46SDan Williams dev_dbg(&port_dev->dev, "link state change\n"); 5077af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5078af376a46SDan Williams USB_PORT_FEAT_C_PORT_LINK_STATE); 5079af376a46SDan Williams } 5080af376a46SDan Williams if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 5081af376a46SDan Williams dev_warn(&port_dev->dev, "config error\n"); 5082af376a46SDan Williams usb_clear_port_feature(hdev, port1, 5083af376a46SDan Williams USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 5084af376a46SDan Williams } 5085af376a46SDan Williams 5086097a155fSDan Williams /* skip port actions that require the port to be powered on */ 5087097a155fSDan Williams if (!pm_runtime_active(&port_dev->dev)) 5088097a155fSDan Williams return; 5089097a155fSDan Williams 5090af376a46SDan Williams if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) 5091af376a46SDan Williams connect_change = 1; 5092af376a46SDan Williams 5093af376a46SDan Williams /* 5094af376a46SDan Williams * Warm reset a USB3 protocol port if it's in 5095af376a46SDan Williams * SS.Inactive state. 5096af376a46SDan Williams */ 50973cd12f91SDan Williams if (hub_port_warm_reset_required(hub, port1, portstatus)) { 5098af376a46SDan Williams dev_dbg(&port_dev->dev, "do warm reset\n"); 5099af376a46SDan Williams if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) 5100af376a46SDan Williams || udev->state == USB_STATE_NOTATTACHED) { 5101af376a46SDan Williams if (hub_port_reset(hub, port1, NULL, 5102af376a46SDan Williams HUB_BH_RESET_TIME, true) < 0) 5103af376a46SDan Williams hub_port_disable(hub, port1, 1); 51047671bd1eSZhuang Jin Can } else { 51055c79a1e3SDan Williams usb_unlock_port(port_dev); 5106af376a46SDan Williams usb_lock_device(udev); 5107af376a46SDan Williams usb_reset_device(udev); 5108af376a46SDan Williams usb_unlock_device(udev); 51095c79a1e3SDan Williams usb_lock_port(port_dev); 5110af376a46SDan Williams connect_change = 0; 5111af376a46SDan Williams } 51127671bd1eSZhuang Jin Can } 5113af376a46SDan Williams 5114af376a46SDan Williams if (connect_change) 5115af376a46SDan Williams hub_port_connect_change(hub, port1, portstatus, portchange); 5116af376a46SDan Williams } 5117af376a46SDan Williams 511832a69589SPetr Mladek static void hub_event(struct work_struct *work) 51191da177e4SLinus Torvalds { 51201da177e4SLinus Torvalds struct usb_device *hdev; 51211da177e4SLinus Torvalds struct usb_interface *intf; 51221da177e4SLinus Torvalds struct usb_hub *hub; 51231da177e4SLinus Torvalds struct device *hub_dev; 51241da177e4SLinus Torvalds u16 hubstatus; 51251da177e4SLinus Torvalds u16 hubchange; 51261da177e4SLinus Torvalds int i, ret; 51271da177e4SLinus Torvalds 512832a69589SPetr Mladek hub = container_of(work, struct usb_hub, events); 51295d14f323SPetr Mladek hdev = hub->hdev; 5130e8054854SAlan Stern hub_dev = hub->intfdev; 5131e8054854SAlan Stern intf = to_usb_interface(hub_dev); 513232a69589SPetr Mladek 513340f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 51343bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 51351da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 51361da177e4SLinus Torvalds (u16) hub->change_bits[0], 513740f122f3SAlan Stern (u16) hub->event_bits[0]); 51381da177e4SLinus Torvalds 51391da177e4SLinus Torvalds /* Lock the device, then check to see if we were 51401da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 514106b84e8aSAlan Stern usb_lock_device(hdev); 5142e8054854SAlan Stern if (unlikely(hub->disconnected)) 514332a69589SPetr Mladek goto out_hdev_lock; 51441da177e4SLinus Torvalds 51451da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 51461da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 51477de18d8bSAlan Stern hub->error = -ENODEV; 51484330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 514932a69589SPetr Mladek goto out_hdev_lock; 51501da177e4SLinus Torvalds } 51511da177e4SLinus Torvalds 515240f122f3SAlan Stern /* Autoresume */ 515340f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 515440f122f3SAlan Stern if (ret) { 515540f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 515632a69589SPetr Mladek goto out_hdev_lock; 515740f122f3SAlan Stern } 515840f122f3SAlan Stern 515940f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 516040f122f3SAlan Stern if (hub->quiescing) 5161eb6e2924SPetr Mladek goto out_autopm; 51621da177e4SLinus Torvalds 51631da177e4SLinus Torvalds if (hub->error) { 5164eb6e2924SPetr Mladek dev_dbg(hub_dev, "resetting for error %d\n", hub->error); 51651da177e4SLinus Torvalds 5166742120c6SMing Lei ret = usb_reset_device(hdev); 51671da177e4SLinus Torvalds if (ret) { 5168eb6e2924SPetr Mladek dev_dbg(hub_dev, "error resetting hub: %d\n", ret); 5169eb6e2924SPetr Mladek goto out_autopm; 51701da177e4SLinus Torvalds } 51711da177e4SLinus Torvalds 51721da177e4SLinus Torvalds hub->nerrors = 0; 51731da177e4SLinus Torvalds hub->error = 0; 51741da177e4SLinus Torvalds } 51751da177e4SLinus Torvalds 51761da177e4SLinus Torvalds /* deal with port status changes */ 51773bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 5178097a155fSDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5179a82b76f7SHans de Goede 51805c79a1e3SDan Williams if (test_bit(i, hub->event_bits) 5181af376a46SDan Williams || test_bit(i, hub->change_bits) 51825c79a1e3SDan Williams || test_bit(i, hub->wakeup_bits)) { 51831da177e4SLinus Torvalds /* 5184097a155fSDan Williams * The get_noresume and barrier ensure that if 5185097a155fSDan Williams * the port was in the process of resuming, we 5186097a155fSDan Williams * flush that work and keep the port active for 5187097a155fSDan Williams * the duration of the port_event(). However, 5188097a155fSDan Williams * if the port is runtime pm suspended 5189097a155fSDan Williams * (powered-off), we leave it in that state, run 5190097a155fSDan Williams * an abbreviated port_event(), and move on. 51911da177e4SLinus Torvalds */ 5192097a155fSDan Williams pm_runtime_get_noresume(&port_dev->dev); 5193097a155fSDan Williams pm_runtime_barrier(&port_dev->dev); 51945c79a1e3SDan Williams usb_lock_port(port_dev); 5195af376a46SDan Williams port_event(hub, i); 51965c79a1e3SDan Williams usb_unlock_port(port_dev); 5197097a155fSDan Williams pm_runtime_put_sync(&port_dev->dev); 51981da177e4SLinus Torvalds } 51991da177e4SLinus Torvalds } 52001da177e4SLinus Torvalds 52011da177e4SLinus Torvalds /* deal with hub status changes */ 52021da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 52031da177e4SLinus Torvalds ; /* do nothing */ 52041da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 52051da177e4SLinus Torvalds dev_err(hub_dev, "get_hub_status failed\n"); 52061da177e4SLinus Torvalds else { 52071da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 52081da177e4SLinus Torvalds dev_dbg(hub_dev, "power change\n"); 52091da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 521055c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 521155c52718SAlan Stern /* FIXME: Is this always true? */ 521255c52718SAlan Stern hub->limited_power = 1; 5213403fae78Sjidong xiao else 5214403fae78Sjidong xiao hub->limited_power = 0; 52151da177e4SLinus Torvalds } 52161da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 5217752d57a8SPaul Bolle u16 status = 0; 5218752d57a8SPaul Bolle u16 unused; 5219752d57a8SPaul Bolle 5220752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 52211da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 5222752d57a8SPaul Bolle msleep(500); /* Cool down */ 52238520f380SAlan Stern hub_power_on(hub, true); 5224752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 5225752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 5226eb6e2924SPetr Mladek dev_err(hub_dev, "over-current condition\n"); 52271da177e4SLinus Torvalds } 52281da177e4SLinus Torvalds } 52291da177e4SLinus Torvalds 5230eb6e2924SPetr Mladek out_autopm: 52318e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 52328e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 523332a69589SPetr Mladek out_hdev_lock: 52341da177e4SLinus Torvalds usb_unlock_device(hdev); 523532a69589SPetr Mladek 523632a69589SPetr Mladek /* Balance the stuff in kick_hub_wq() and allow autosuspend */ 523732a69589SPetr Mladek usb_autopm_put_interface(intf); 5238e8054854SAlan Stern kref_put(&hub->kref, hub_release); 52391da177e4SLinus Torvalds } 52401da177e4SLinus Torvalds 52411e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 5242e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 5243e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 5244e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 5245e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 5246e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 52471da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 52481da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 52491da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 52501da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 52511da177e4SLinus Torvalds { } /* Terminating entry */ 52521da177e4SLinus Torvalds }; 52531da177e4SLinus Torvalds 52541da177e4SLinus Torvalds MODULE_DEVICE_TABLE(usb, hub_id_table); 52551da177e4SLinus Torvalds 52561da177e4SLinus Torvalds static struct usb_driver hub_driver = { 52571da177e4SLinus Torvalds .name = "hub", 52581da177e4SLinus Torvalds .probe = hub_probe, 52591da177e4SLinus Torvalds .disconnect = hub_disconnect, 52601da177e4SLinus Torvalds .suspend = hub_suspend, 52611da177e4SLinus Torvalds .resume = hub_resume, 5262f07600cfSAlan Stern .reset_resume = hub_reset_resume, 52637de18d8bSAlan Stern .pre_reset = hub_pre_reset, 52647de18d8bSAlan Stern .post_reset = hub_post_reset, 5265c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 52661da177e4SLinus Torvalds .id_table = hub_id_table, 526740f122f3SAlan Stern .supports_autosuspend = 1, 52681da177e4SLinus Torvalds }; 52691da177e4SLinus Torvalds 52701da177e4SLinus Torvalds int usb_hub_init(void) 52711da177e4SLinus Torvalds { 52721da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 52731da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 52741da177e4SLinus Torvalds usbcore_name); 52751da177e4SLinus Torvalds return -1; 52761da177e4SLinus Torvalds } 52771da177e4SLinus Torvalds 527832a69589SPetr Mladek /* 527932a69589SPetr Mladek * The workqueue needs to be freezable to avoid interfering with 528032a69589SPetr Mladek * USB-PERSIST port handover. Otherwise it might see that a full-speed 528132a69589SPetr Mladek * device was gone before the EHCI controller had handed its port 528232a69589SPetr Mladek * over to the companion full-speed controller. 528332a69589SPetr Mladek */ 5284638139ebSPetr Mladek hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); 528532a69589SPetr Mladek if (hub_wq) 52861da177e4SLinus Torvalds return 0; 52871da177e4SLinus Torvalds 52881da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 52891da177e4SLinus Torvalds usb_deregister(&hub_driver); 529032a69589SPetr Mladek pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); 52911da177e4SLinus Torvalds 52921da177e4SLinus Torvalds return -1; 52931da177e4SLinus Torvalds } 52941da177e4SLinus Torvalds 52951da177e4SLinus Torvalds void usb_hub_cleanup(void) 52961da177e4SLinus Torvalds { 529732a69589SPetr Mladek destroy_workqueue(hub_wq); 52981da177e4SLinus Torvalds 52991da177e4SLinus Torvalds /* 53001da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 53011da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 53021da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 53031da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 53041da177e4SLinus Torvalds * individual hub resources. -greg 53051da177e4SLinus Torvalds */ 53061da177e4SLinus Torvalds usb_deregister(&hub_driver); 53071da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 53081da177e4SLinus Torvalds 5309eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 5310e3376d6cSXenia Ragiadakou struct usb_device_descriptor *old_device_descriptor, 5311e3376d6cSXenia Ragiadakou struct usb_host_bos *old_bos) 53121da177e4SLinus Torvalds { 5313eb764c4bSAlan Stern int changed = 0; 53141da177e4SLinus Torvalds unsigned index; 5315eb764c4bSAlan Stern unsigned serial_len = 0; 5316eb764c4bSAlan Stern unsigned len; 5317eb764c4bSAlan Stern unsigned old_length; 5318eb764c4bSAlan Stern int length; 5319eb764c4bSAlan Stern char *buf; 53201da177e4SLinus Torvalds 5321eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 5322eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 5323eb764c4bSAlan Stern return 1; 5324eb764c4bSAlan Stern 5325e3376d6cSXenia Ragiadakou if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5326e3376d6cSXenia Ragiadakou return 1; 5327e3376d6cSXenia Ragiadakou if (udev->bos) { 5328b9a10481SXenia Ragiadakou len = le16_to_cpu(udev->bos->desc->wTotalLength); 5329b9a10481SXenia Ragiadakou if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5330e3376d6cSXenia Ragiadakou return 1; 5331b9a10481SXenia Ragiadakou if (memcmp(udev->bos->desc, old_bos->desc, len)) 5332e3376d6cSXenia Ragiadakou return 1; 5333e3376d6cSXenia Ragiadakou } 5334e3376d6cSXenia Ragiadakou 5335eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 5336eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 5337eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 5338eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 5339eb764c4bSAlan Stern * different flash card of the same brand). 5340eb764c4bSAlan Stern */ 5341eb764c4bSAlan Stern if (udev->serial) 5342eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 5343eb764c4bSAlan Stern 5344eb764c4bSAlan Stern len = serial_len; 53451da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5346eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5347eb764c4bSAlan Stern len = max(len, old_length); 53481da177e4SLinus Torvalds } 5349eb764c4bSAlan Stern 53500cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 5351b74e7062SWolfram Sang if (!buf) 53521da177e4SLinus Torvalds /* assume the worst */ 53531da177e4SLinus Torvalds return 1; 5354b74e7062SWolfram Sang 53551da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5356eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 53571da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 53581da177e4SLinus Torvalds old_length); 5359eb764c4bSAlan Stern if (length != old_length) { 53601da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 53611da177e4SLinus Torvalds index, length); 5362eb764c4bSAlan Stern changed = 1; 53631da177e4SLinus Torvalds break; 53641da177e4SLinus Torvalds } 53651da177e4SLinus Torvalds if (memcmp(buf, udev->rawdescriptors[index], old_length) 53661da177e4SLinus Torvalds != 0) { 53671da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5368eb764c4bSAlan Stern index, 5369eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 5370eb764c4bSAlan Stern bConfigurationValue); 5371eb764c4bSAlan Stern changed = 1; 53721da177e4SLinus Torvalds break; 53731da177e4SLinus Torvalds } 53741da177e4SLinus Torvalds } 5375eb764c4bSAlan Stern 5376eb764c4bSAlan Stern if (!changed && serial_len) { 5377eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5378eb764c4bSAlan Stern buf, serial_len); 5379eb764c4bSAlan Stern if (length + 1 != serial_len) { 5380eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5381eb764c4bSAlan Stern length); 5382eb764c4bSAlan Stern changed = 1; 5383eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5384eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5385eb764c4bSAlan Stern changed = 1; 5386eb764c4bSAlan Stern } 5387eb764c4bSAlan Stern } 5388eb764c4bSAlan Stern 53891da177e4SLinus Torvalds kfree(buf); 5390eb764c4bSAlan Stern return changed; 53911da177e4SLinus Torvalds } 53921da177e4SLinus Torvalds 53931da177e4SLinus Torvalds /** 5394742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 53951da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 53961da177e4SLinus Torvalds * 539779efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 539879efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5399742120c6SMing Lei * Use usb_reset_device() instead. 54001da177e4SLinus Torvalds * 54011da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 54021da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 54031da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 54041da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 540537ebb549SPetr Mladek * telling hub_wq to pretend the device has been disconnected and then 54061da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 54071da177e4SLinus Torvalds * re-enumerated and probed all over again. 54081da177e4SLinus Torvalds * 5409626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 54101da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 54111da177e4SLinus Torvalds * if the reset wasn't even attempted. 54121da177e4SLinus Torvalds * 5413626f090cSYacine Belkadi * Note: 54145c79a1e3SDan Williams * The caller must own the device lock and the port lock, the latter is 54155c79a1e3SDan Williams * taken by usb_reset_device(). For example, it's safe to use 54165c79a1e3SDan Williams * usb_reset_device() from a driver probe() routine after downloading 54175c79a1e3SDan Williams * new firmware. For calls that might not occur during probe(), drivers 54185c79a1e3SDan Williams * should lock the device using usb_lock_device_for_reset(). 54196bc6cff5SAlan Stern * 54206bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 54216bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 54226bc6cff5SAlan Stern * holding the device lock because these tasks should always call 54235c79a1e3SDan Williams * usb_autopm_resume_device(), thereby preventing any unwanted 54245c79a1e3SDan Williams * autoresume. The autoresume handler is expected to have already 54255c79a1e3SDan Williams * acquired the port lock before calling this routine. 54261da177e4SLinus Torvalds */ 5427742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 54281da177e4SLinus Torvalds { 54291da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 54301da177e4SLinus Torvalds struct usb_hub *parent_hub; 54313f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 54321da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5433e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 54347a7b562dSHans de Goede int i, j, ret = 0; 543512c3da34SAlan Stern int port1 = udev->portnum; 54361da177e4SLinus Torvalds 54371da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 54381da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 54391da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 54401da177e4SLinus Torvalds udev->state); 54411da177e4SLinus Torvalds return -EINVAL; 54421da177e4SLinus Torvalds } 54431da177e4SLinus Torvalds 54445c79a1e3SDan Williams if (!parent_hdev) 54451da177e4SLinus Torvalds return -EISDIR; 54465c79a1e3SDan Williams 5447ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 54481da177e4SLinus Torvalds 5449dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5450dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5451dcc01c08SSarah Sharp */ 5452dcc01c08SSarah Sharp if (udev->usb2_hw_lpm_enabled == 1) 5453dcc01c08SSarah Sharp usb_set_usb2_hardware_lpm(udev, 0); 5454dcc01c08SSarah Sharp 5455f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5456f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5457f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5458f74631e3SSarah Sharp * them up again. 54596d1d0513SSarah Sharp */ 54606d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 54616d1d0513SSarah Sharp if (ret) { 54626d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 5463464ad8c4SHans Yang goto re_enumerate_no_bos; 54646d1d0513SSarah Sharp } 5465f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5466f74631e3SSarah Sharp if (ret) { 5467f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5468f74631e3SSarah Sharp __func__); 5469464ad8c4SHans Yang goto re_enumerate_no_bos; 5470f74631e3SSarah Sharp } 54716d1d0513SSarah Sharp 5472464ad8c4SHans Yang bos = udev->bos; 5473e5bdfd50SGreg Kroah-Hartman udev->bos = NULL; 5474464ad8c4SHans Yang 54751da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 54761da177e4SLinus Torvalds 54771da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 54781da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5479fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 54801da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5481dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 54821da177e4SLinus Torvalds break; 54831da177e4SLinus Torvalds } 5484d5cbad4bSAlan Stern 54851da177e4SLinus Torvalds if (ret < 0) 54861da177e4SLinus Torvalds goto re_enumerate; 54871da177e4SLinus Torvalds 54881da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5489e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 54901da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 54911da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 54921da177e4SLinus Torvalds goto re_enumerate; 54931da177e4SLinus Torvalds } 54941da177e4SLinus Torvalds 54954fe0387aSAlan Stern /* Restore the device's previous configuration */ 54961da177e4SLinus Torvalds if (!udev->actconfig) 54971da177e4SLinus Torvalds goto done; 54983f0479e0SSarah Sharp 5499d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 55003f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 55013f0479e0SSarah Sharp if (ret < 0) { 55023f0479e0SSarah Sharp dev_warn(&udev->dev, 55033f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 55043f0479e0SSarah Sharp "old configuration.\n"); 5505d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 55063f0479e0SSarah Sharp goto re_enumerate; 55073f0479e0SSarah Sharp } 55081da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 55091da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 55101da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 55111da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 55121da177e4SLinus Torvalds if (ret < 0) { 55131da177e4SLinus Torvalds dev_err(&udev->dev, 55141da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 55151da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5516d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 55171da177e4SLinus Torvalds goto re_enumerate; 55181da177e4SLinus Torvalds } 5519d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 55201da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 55211da177e4SLinus Torvalds 55224fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 55234fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 55244fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 55254fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 55264fe0387aSAlan Stern * endpoint state. 55274fe0387aSAlan Stern */ 55281da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 55293f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 55303f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 55311da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 55321da177e4SLinus Torvalds 55331da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 55344fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 55354fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 55364fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 55374fe0387aSAlan Stern ret = 0; 55384fe0387aSAlan Stern } else { 553904a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 554004a723eaSSarah Sharp * device has been reset, and it will have to use 554104a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 55423f0479e0SSarah Sharp */ 554304a723eaSSarah Sharp intf->resetting_device = 1; 55441da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 55451da177e4SLinus Torvalds desc->bAlternateSetting); 554604a723eaSSarah Sharp intf->resetting_device = 0; 55474fe0387aSAlan Stern } 55481da177e4SLinus Torvalds if (ret < 0) { 55491da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 55501da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 55511da177e4SLinus Torvalds desc->bInterfaceNumber, 55521da177e4SLinus Torvalds desc->bAlternateSetting, 55531da177e4SLinus Torvalds ret); 55541da177e4SLinus Torvalds goto re_enumerate; 55551da177e4SLinus Torvalds } 55567a7b562dSHans de Goede /* Resetting also frees any allocated streams */ 55577a7b562dSHans de Goede for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) 55587a7b562dSHans de Goede intf->cur_altsetting->endpoint[j].streams = 0; 55591da177e4SLinus Torvalds } 55601da177e4SLinus Torvalds 55611da177e4SLinus Torvalds done: 5562f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 5563de68bab4SSarah Sharp usb_set_usb2_hardware_lpm(udev, 1); 556478d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5565f74631e3SSarah Sharp usb_enable_ltm(udev); 5566e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5567e3376d6cSXenia Ragiadakou udev->bos = bos; 55681da177e4SLinus Torvalds return 0; 55691da177e4SLinus Torvalds 55701da177e4SLinus Torvalds re_enumerate: 5571e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5572e3376d6cSXenia Ragiadakou udev->bos = bos; 5573464ad8c4SHans Yang re_enumerate_no_bos: 5574464ad8c4SHans Yang /* LPM state doesn't matter when we're about to destroy the device. */ 5575464ad8c4SHans Yang hub_port_logical_disconnect(parent_hub, port1); 55761da177e4SLinus Torvalds return -ENODEV; 55771da177e4SLinus Torvalds } 55781da177e4SLinus Torvalds 55791da177e4SLinus Torvalds /** 55801da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 55811da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 55821da177e4SLinus Torvalds * 558379efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 558479efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5585742120c6SMing Lei * the reset is over (using their post_reset method). 558679efa097SAlan Stern * 5587626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 558879efa097SAlan Stern * 5589626f090cSYacine Belkadi * Note: 559079efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 559179efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 559279efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5593742120c6SMing Lei * the device using usb_lock_device_for_reset(). 559479efa097SAlan Stern * 559579efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 559679efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 559779efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 559879efa097SAlan Stern * we attempt to unbind it and rebind afterward. 559979efa097SAlan Stern */ 5600742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 560179efa097SAlan Stern { 560279efa097SAlan Stern int ret; 5603852c4b43SAlan Stern int i; 56044d769defSMing Lei unsigned int noio_flag; 56055c79a1e3SDan Williams struct usb_port *port_dev; 560679efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 56075c79a1e3SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 560879efa097SAlan Stern 560979efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 561079efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 561179efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 561279efa097SAlan Stern udev->state); 561379efa097SAlan Stern return -EINVAL; 561479efa097SAlan Stern } 561579efa097SAlan Stern 56165c79a1e3SDan Williams if (!udev->parent) { 56175c79a1e3SDan Williams /* this requires hcd-specific logic; see ohci_restart() */ 56185c79a1e3SDan Williams dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 56195c79a1e3SDan Williams return -EISDIR; 56205c79a1e3SDan Williams } 56215c79a1e3SDan Williams 56225c79a1e3SDan Williams port_dev = hub->ports[udev->portnum - 1]; 56235c79a1e3SDan Williams 56244d769defSMing Lei /* 56254d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 56264d769defSMing Lei * context to avoid possible deadlock if usb mass 56274d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 56284d769defSMing Lei * is included in current configuration. The easist 56294d769defSMing Lei * approach is to do it for every device reset, 56304d769defSMing Lei * because the device 'memalloc_noio' flag may have 56314d769defSMing Lei * not been set before reseting the usb device. 56324d769defSMing Lei */ 56334d769defSMing Lei noio_flag = memalloc_noio_save(); 56344d769defSMing Lei 5635645daaabSAlan Stern /* Prevent autosuspend during the reset */ 563694fcda1fSAlan Stern usb_autoresume_device(udev); 5637645daaabSAlan Stern 563879efa097SAlan Stern if (config) { 5639852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5640852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 564179efa097SAlan Stern struct usb_driver *drv; 564278d9a487SAlan Stern int unbind = 0; 564379efa097SAlan Stern 5644852c4b43SAlan Stern if (cintf->dev.driver) { 564579efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 564678d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 564778d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 564878d9a487SAlan Stern else if (cintf->condition == 564978d9a487SAlan Stern USB_INTERFACE_BOUND) 565078d9a487SAlan Stern unbind = 1; 565178d9a487SAlan Stern if (unbind) 565278d9a487SAlan Stern usb_forced_unbind_intf(cintf); 565379efa097SAlan Stern } 565479efa097SAlan Stern } 565579efa097SAlan Stern } 565679efa097SAlan Stern 56575c79a1e3SDan Williams usb_lock_port(port_dev); 5658742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 56595c79a1e3SDan Williams usb_unlock_port(port_dev); 566079efa097SAlan Stern 566179efa097SAlan Stern if (config) { 5662852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5663852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 566479efa097SAlan Stern struct usb_driver *drv; 566578d9a487SAlan Stern int rebind = cintf->needs_binding; 566679efa097SAlan Stern 566778d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 566879efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 566979efa097SAlan Stern if (drv->post_reset) 567078d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 567178d9a487SAlan Stern else if (cintf->condition == 567278d9a487SAlan Stern USB_INTERFACE_BOUND) 567378d9a487SAlan Stern rebind = 1; 56746aec044cSAlan Stern if (rebind) 56756aec044cSAlan Stern cintf->needs_binding = 1; 567679efa097SAlan Stern } 567779efa097SAlan Stern } 56786aec044cSAlan Stern usb_unbind_and_rebind_marked_interfaces(udev); 567979efa097SAlan Stern } 568079efa097SAlan Stern 568194fcda1fSAlan Stern usb_autosuspend_device(udev); 56824d769defSMing Lei memalloc_noio_restore(noio_flag); 568379efa097SAlan Stern return ret; 568479efa097SAlan Stern } 5685742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5686dc023dceSInaky Perez-Gonzalez 5687dc023dceSInaky Perez-Gonzalez 5688dc023dceSInaky Perez-Gonzalez /** 5689dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5690dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5691dc023dceSInaky Perez-Gonzalez * 5692dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5693dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5694dc023dceSInaky Perez-Gonzalez * 5695dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5696dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5697dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5698dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5699dc023dceSInaky Perez-Gonzalez * 5700dc023dceSInaky Perez-Gonzalez * Corner cases: 5701dc023dceSInaky Perez-Gonzalez * 5702dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5703dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5704dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5705dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5706dc023dceSInaky Perez-Gonzalez * 5707524134d4SAlan Stern * - If the reset is delayed so long that the interface is unbound from 5708524134d4SAlan Stern * its driver, the reset will be skipped. 5709dc023dceSInaky Perez-Gonzalez * 5710524134d4SAlan Stern * - This function can be called during .probe(). It can also be called 5711524134d4SAlan Stern * during .disconnect(), but doing so is pointless because the reset 5712524134d4SAlan Stern * will not occur. If you really want to reset the device during 5713524134d4SAlan Stern * .disconnect(), call usb_reset_device() directly -- but watch out 5714524134d4SAlan Stern * for nested unbinding issues! 5715dc023dceSInaky Perez-Gonzalez */ 5716dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5717dc023dceSInaky Perez-Gonzalez { 5718524134d4SAlan Stern if (schedule_work(&iface->reset_ws)) 5719524134d4SAlan Stern usb_get_intf(iface); 5720dc023dceSInaky Perez-Gonzalez } 5721dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5722ff823c79SLan Tianyu 5723ff823c79SLan Tianyu /** 5724ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5725ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5726ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5727ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5728ff823c79SLan Tianyu * is attached to. 5729ff823c79SLan Tianyu * 5730ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5731ff823c79SLan Tianyu * pointer. 5732ff823c79SLan Tianyu * 5733626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5734ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5735ff823c79SLan Tianyu */ 5736ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5737ff823c79SLan Tianyu int port1) 5738ff823c79SLan Tianyu { 5739ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5740ff823c79SLan Tianyu 5741ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5742ff823c79SLan Tianyu return NULL; 5743ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5744ff823c79SLan Tianyu } 5745ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5746d5575424SLan Tianyu 5747d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5748d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5749d2123fd9SLan Tianyu { 5750d99f6b41SDan Williams struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5751d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5752d2123fd9SLan Tianyu int i; 5753d2123fd9SLan Tianyu 5754d99f6b41SDan Williams if (!hub) 5755d99f6b41SDan Williams return; 5756d99f6b41SDan Williams 5757d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5758d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5759d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5760d2123fd9SLan Tianyu 5761d99f6b41SDan Williams connect_type = port_dev->connect_type; 5762d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5763d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5764d2123fd9SLan Tianyu 5765d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5766d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5767d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5768d2123fd9SLan Tianyu } 5769d2123fd9SLan Tianyu } 5770d2123fd9SLan Tianyu } 5771d2123fd9SLan Tianyu } else { 5772d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5773d2123fd9SLan Tianyu 5774d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5775d99f6b41SDan Williams struct usb_port *port_dev = hub->ports[i - 1]; 5776d2123fd9SLan Tianyu 5777d99f6b41SDan Williams connect_type = port_dev->connect_type; 5778d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5779d2123fd9SLan Tianyu u16 mask = 1 << i; 5780d2123fd9SLan Tianyu 5781d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5782d99f6b41SDan Williams dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); 5783d2123fd9SLan Tianyu port_removable |= mask; 5784d2123fd9SLan Tianyu } 5785d2123fd9SLan Tianyu } 5786d2123fd9SLan Tianyu } 5787d2123fd9SLan Tianyu 5788d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5789d2123fd9SLan Tianyu } 5790d2123fd9SLan Tianyu } 5791d2123fd9SLan Tianyu 5792d5575424SLan Tianyu #ifdef CONFIG_ACPI 5793d5575424SLan Tianyu /** 5794d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5795d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5796d5575424SLan Tianyu * @port1: port num of the port 5797d5575424SLan Tianyu * 5798626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5799626f090cSYacine Belkadi * invalid. 5800d5575424SLan Tianyu */ 5801d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5802d5575424SLan Tianyu int port1) 5803d5575424SLan Tianyu { 5804ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5805d5575424SLan Tianyu 580641341261SMathias Nyman if (!hub) 580741341261SMathias Nyman return NULL; 580841341261SMathias Nyman 58093a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5810d5575424SLan Tianyu } 5811d5575424SLan Tianyu #endif 5812