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 * 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/errno.h> 131da177e4SLinus Torvalds #include <linux/module.h> 141da177e4SLinus Torvalds #include <linux/moduleparam.h> 151da177e4SLinus Torvalds #include <linux/completion.h> 161da177e4SLinus Torvalds #include <linux/sched.h> 171da177e4SLinus Torvalds #include <linux/list.h> 181da177e4SLinus Torvalds #include <linux/slab.h> 191da177e4SLinus Torvalds #include <linux/ioctl.h> 201da177e4SLinus Torvalds #include <linux/usb.h> 211da177e4SLinus Torvalds #include <linux/usbdevice_fs.h> 2227729aadSEric Lescouet #include <linux/usb/hcd.h> 23925aa46bSRichard Zhao #include <linux/usb/otg.h> 2493362a87SPhil Dibowitz #include <linux/usb/quirks.h> 259c8d6178Sakpm@osdl.org #include <linux/kthread.h> 264186ecf8SArjan van de Ven #include <linux/mutex.h> 277dfb7103SNigel Cunningham #include <linux/freezer.h> 28b04b3156STheodore Ts'o #include <linux/random.h> 29ad493e5eSLan Tianyu #include <linux/pm_qos.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/uaccess.h> 321da177e4SLinus Torvalds #include <asm/byteorder.h> 331da177e4SLinus Torvalds 346e30d7cbSLan Tianyu #include "hub.h" 351da177e4SLinus Torvalds 36e6f30deaSMing Lei #define USB_VENDOR_GENESYS_LOGIC 0x05e3 37e6f30deaSMing Lei #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 38e6f30deaSMing Lei 39dbe79bbeSJohn Youn static inline int hub_is_superspeed(struct usb_device *hdev) 40dbe79bbeSJohn Youn { 417bf01185SAman Deep return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS); 42dbe79bbeSJohn Youn } 431bb5f66bSAlan Stern 44fa286188SGreg Kroah-Hartman /* Protect struct usb_device->state and ->children members 459ad3d6ccSAlan Stern * Note: Both are also protected by ->dev.sem, except that ->state can 461da177e4SLinus Torvalds * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ 471da177e4SLinus Torvalds static DEFINE_SPINLOCK(device_state_lock); 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds /* khubd's worklist and its lock */ 501da177e4SLinus Torvalds static DEFINE_SPINLOCK(hub_event_lock); 511da177e4SLinus Torvalds static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds /* Wakes up khubd */ 541da177e4SLinus Torvalds static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); 551da177e4SLinus Torvalds 569c8d6178Sakpm@osdl.org static struct task_struct *khubd_task; 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds /* cycle leds on hubs that aren't blinking for attention */ 5990ab5ee9SRusty Russell static bool blinkenlights = 0; 601da177e4SLinus Torvalds module_param (blinkenlights, bool, S_IRUGO); 611da177e4SLinus Torvalds MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs"); 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds /* 64fd7c519dSJaroslav Kysela * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about 65fd7c519dSJaroslav Kysela * 10 seconds to send reply for the initial 64-byte descriptor request. 66fd7c519dSJaroslav Kysela */ 67fd7c519dSJaroslav Kysela /* define initial 64-byte descriptor request timeout in milliseconds */ 68fd7c519dSJaroslav Kysela static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; 69fd7c519dSJaroslav Kysela module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); 70b9cef6c3SWu Fengguang MODULE_PARM_DESC(initial_descriptor_timeout, 71b9cef6c3SWu Fengguang "initial 64-byte descriptor request timeout in milliseconds " 72b9cef6c3SWu Fengguang "(default 5000 - 5.0 seconds)"); 73fd7c519dSJaroslav Kysela 74fd7c519dSJaroslav Kysela /* 751da177e4SLinus Torvalds * As of 2.6.10 we introduce a new USB device initialization scheme which 761da177e4SLinus Torvalds * closely resembles the way Windows works. Hopefully it will be compatible 771da177e4SLinus Torvalds * with a wider range of devices than the old scheme. However some previously 781da177e4SLinus Torvalds * working devices may start giving rise to "device not accepting address" 791da177e4SLinus Torvalds * errors; if that happens the user can try the old scheme by adjusting the 801da177e4SLinus Torvalds * following module parameters. 811da177e4SLinus Torvalds * 821da177e4SLinus Torvalds * For maximum flexibility there are two boolean parameters to control the 831da177e4SLinus Torvalds * hub driver's behavior. On the first initialization attempt, if the 841da177e4SLinus Torvalds * "old_scheme_first" parameter is set then the old scheme will be used, 851da177e4SLinus Torvalds * otherwise the new scheme is used. If that fails and "use_both_schemes" 861da177e4SLinus Torvalds * is set, then the driver will make another attempt, using the other scheme. 871da177e4SLinus Torvalds */ 8890ab5ee9SRusty Russell static bool old_scheme_first = 0; 891da177e4SLinus Torvalds module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); 901da177e4SLinus Torvalds MODULE_PARM_DESC(old_scheme_first, 911da177e4SLinus Torvalds "start with the old device initialization scheme"); 921da177e4SLinus Torvalds 9390ab5ee9SRusty Russell static bool use_both_schemes = 1; 941da177e4SLinus Torvalds module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); 951da177e4SLinus Torvalds MODULE_PARM_DESC(use_both_schemes, 961da177e4SLinus Torvalds "try the other device initialization scheme if the " 971da177e4SLinus Torvalds "first one fails"); 981da177e4SLinus Torvalds 9932fe0198SAlan Stern /* Mutual exclusion for EHCI CF initialization. This interferes with 10032fe0198SAlan Stern * port reset on some companion controllers. 10132fe0198SAlan Stern */ 10232fe0198SAlan Stern DECLARE_RWSEM(ehci_cf_port_reset_rwsem); 10332fe0198SAlan Stern EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); 10432fe0198SAlan Stern 105ad493e5eSLan Tianyu #define HUB_DEBOUNCE_TIMEOUT 2000 106948fea37SAlan Stern #define HUB_DEBOUNCE_STEP 25 107948fea37SAlan Stern #define HUB_DEBOUNCE_STABLE 100 108948fea37SAlan Stern 109742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev); 110742120c6SMing Lei 111131dec34SSarah Sharp static inline char *portspeed(struct usb_hub *hub, int portstatus) 1121da177e4SLinus Torvalds { 113131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 114131dec34SSarah Sharp return "5.0 Gb/s"; 115288ead45SAlan Stern if (portstatus & USB_PORT_STAT_HIGH_SPEED) 1161da177e4SLinus Torvalds return "480 Mb/s"; 117288ead45SAlan Stern else if (portstatus & USB_PORT_STAT_LOW_SPEED) 1181da177e4SLinus Torvalds return "1.5 Mb/s"; 1191da177e4SLinus Torvalds else 1201da177e4SLinus Torvalds return "12 Mb/s"; 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds /* Note that hdev or one of its children must be locked! */ 124ad493e5eSLan Tianyu struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) 1251da177e4SLinus Torvalds { 126ff823c79SLan Tianyu if (!hdev || !hdev->actconfig || !hdev->maxchild) 12725118084SAlan Stern return NULL; 1281da177e4SLinus Torvalds return usb_get_intfdata(hdev->actconfig->interface[0]); 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 131140e3026SSarah Sharp static int usb_device_supports_lpm(struct usb_device *udev) 132d9b2099cSSarah Sharp { 133d9b2099cSSarah Sharp /* USB 2.1 (and greater) devices indicate LPM support through 134d9b2099cSSarah Sharp * their USB 2.0 Extended Capabilities BOS descriptor. 135d9b2099cSSarah Sharp */ 136d9b2099cSSarah Sharp if (udev->speed == USB_SPEED_HIGH) { 137d9b2099cSSarah Sharp if (udev->bos->ext_cap && 138d9b2099cSSarah Sharp (USB_LPM_SUPPORT & 139d9b2099cSSarah Sharp le32_to_cpu(udev->bos->ext_cap->bmAttributes))) 140d9b2099cSSarah Sharp return 1; 141d9b2099cSSarah Sharp return 0; 142d9b2099cSSarah Sharp } 14351e0a012SSarah Sharp 14451e0a012SSarah Sharp /* All USB 3.0 must support LPM, but we need their max exit latency 14551e0a012SSarah Sharp * information from the SuperSpeed Extended Capabilities BOS descriptor. 14651e0a012SSarah Sharp */ 14751e0a012SSarah Sharp if (!udev->bos->ss_cap) { 14851e0a012SSarah Sharp dev_warn(&udev->dev, "No LPM exit latency info found. " 14951e0a012SSarah Sharp "Power management will be impacted.\n"); 150d9b2099cSSarah Sharp return 0; 151d9b2099cSSarah Sharp } 15251e0a012SSarah Sharp if (udev->parent->lpm_capable) 15351e0a012SSarah Sharp return 1; 15451e0a012SSarah Sharp 15551e0a012SSarah Sharp dev_warn(&udev->dev, "Parent hub missing LPM exit latency info. " 15651e0a012SSarah Sharp "Power management will be impacted.\n"); 15751e0a012SSarah Sharp return 0; 15851e0a012SSarah Sharp } 15951e0a012SSarah Sharp 16051e0a012SSarah Sharp /* 16151e0a012SSarah Sharp * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from 16251e0a012SSarah Sharp * either U1 or U2. 16351e0a012SSarah Sharp */ 16451e0a012SSarah Sharp static void usb_set_lpm_mel(struct usb_device *udev, 16551e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 16651e0a012SSarah Sharp unsigned int udev_exit_latency, 16751e0a012SSarah Sharp struct usb_hub *hub, 16851e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 16951e0a012SSarah Sharp unsigned int hub_exit_latency) 17051e0a012SSarah Sharp { 17151e0a012SSarah Sharp unsigned int total_mel; 17251e0a012SSarah Sharp unsigned int device_mel; 17351e0a012SSarah Sharp unsigned int hub_mel; 17451e0a012SSarah Sharp 17551e0a012SSarah Sharp /* 17651e0a012SSarah Sharp * Calculate the time it takes to transition all links from the roothub 17751e0a012SSarah Sharp * to the parent hub into U0. The parent hub must then decode the 17851e0a012SSarah Sharp * packet (hub header decode latency) to figure out which port it was 17951e0a012SSarah Sharp * bound for. 18051e0a012SSarah Sharp * 18151e0a012SSarah Sharp * The Hub Header decode latency is expressed in 0.1us intervals (0x1 18251e0a012SSarah Sharp * means 0.1us). Multiply that by 100 to get nanoseconds. 18351e0a012SSarah Sharp */ 18451e0a012SSarah Sharp total_mel = hub_lpm_params->mel + 18551e0a012SSarah Sharp (hub->descriptor->u.ss.bHubHdrDecLat * 100); 18651e0a012SSarah Sharp 18751e0a012SSarah Sharp /* 18851e0a012SSarah Sharp * How long will it take to transition the downstream hub's port into 18951e0a012SSarah Sharp * U0? The greater of either the hub exit latency or the device exit 19051e0a012SSarah Sharp * latency. 19151e0a012SSarah Sharp * 19251e0a012SSarah Sharp * The BOS U1/U2 exit latencies are expressed in 1us intervals. 19351e0a012SSarah Sharp * Multiply that by 1000 to get nanoseconds. 19451e0a012SSarah Sharp */ 19551e0a012SSarah Sharp device_mel = udev_exit_latency * 1000; 19651e0a012SSarah Sharp hub_mel = hub_exit_latency * 1000; 19751e0a012SSarah Sharp if (device_mel > hub_mel) 19851e0a012SSarah Sharp total_mel += device_mel; 19951e0a012SSarah Sharp else 20051e0a012SSarah Sharp total_mel += hub_mel; 20151e0a012SSarah Sharp 20251e0a012SSarah Sharp udev_lpm_params->mel = total_mel; 20351e0a012SSarah Sharp } 20451e0a012SSarah Sharp 20551e0a012SSarah Sharp /* 20651e0a012SSarah Sharp * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate 20751e0a012SSarah Sharp * a transition from either U1 or U2. 20851e0a012SSarah Sharp */ 20951e0a012SSarah Sharp static void usb_set_lpm_pel(struct usb_device *udev, 21051e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params, 21151e0a012SSarah Sharp unsigned int udev_exit_latency, 21251e0a012SSarah Sharp struct usb_hub *hub, 21351e0a012SSarah Sharp struct usb3_lpm_parameters *hub_lpm_params, 21451e0a012SSarah Sharp unsigned int hub_exit_latency, 21551e0a012SSarah Sharp unsigned int port_to_port_exit_latency) 21651e0a012SSarah Sharp { 21751e0a012SSarah Sharp unsigned int first_link_pel; 21851e0a012SSarah Sharp unsigned int hub_pel; 21951e0a012SSarah Sharp 22051e0a012SSarah Sharp /* 22151e0a012SSarah Sharp * First, the device sends an LFPS to transition the link between the 22251e0a012SSarah Sharp * device and the parent hub into U0. The exit latency is the bigger of 22351e0a012SSarah Sharp * the device exit latency or the hub exit latency. 22451e0a012SSarah Sharp */ 22551e0a012SSarah Sharp if (udev_exit_latency > hub_exit_latency) 22651e0a012SSarah Sharp first_link_pel = udev_exit_latency * 1000; 22751e0a012SSarah Sharp else 22851e0a012SSarah Sharp first_link_pel = hub_exit_latency * 1000; 22951e0a012SSarah Sharp 23051e0a012SSarah Sharp /* 23151e0a012SSarah Sharp * When the hub starts to receive the LFPS, there is a slight delay for 23251e0a012SSarah Sharp * it to figure out that one of the ports is sending an LFPS. Then it 23351e0a012SSarah Sharp * will forward the LFPS to its upstream link. The exit latency is the 23451e0a012SSarah Sharp * delay, plus the PEL that we calculated for this hub. 23551e0a012SSarah Sharp */ 23651e0a012SSarah Sharp hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; 23751e0a012SSarah Sharp 23851e0a012SSarah Sharp /* 23951e0a012SSarah Sharp * According to figure C-7 in the USB 3.0 spec, the PEL for this device 24051e0a012SSarah Sharp * is the greater of the two exit latencies. 24151e0a012SSarah Sharp */ 24251e0a012SSarah Sharp if (first_link_pel > hub_pel) 24351e0a012SSarah Sharp udev_lpm_params->pel = first_link_pel; 24451e0a012SSarah Sharp else 24551e0a012SSarah Sharp udev_lpm_params->pel = hub_pel; 24651e0a012SSarah Sharp } 24751e0a012SSarah Sharp 24851e0a012SSarah Sharp /* 24951e0a012SSarah Sharp * Set the System Exit Latency (SEL) to indicate the total worst-case time from 25051e0a012SSarah Sharp * when a device initiates a transition to U0, until when it will receive the 25151e0a012SSarah Sharp * first packet from the host controller. 25251e0a012SSarah Sharp * 25351e0a012SSarah Sharp * Section C.1.5.1 describes the four components to this: 25451e0a012SSarah Sharp * - t1: device PEL 25551e0a012SSarah Sharp * - t2: time for the ERDY to make it from the device to the host. 25651e0a012SSarah Sharp * - t3: a host-specific delay to process the ERDY. 25751e0a012SSarah Sharp * - t4: time for the packet to make it from the host to the device. 25851e0a012SSarah Sharp * 25951e0a012SSarah Sharp * t3 is specific to both the xHCI host and the platform the host is integrated 26051e0a012SSarah Sharp * into. The Intel HW folks have said it's negligible, FIXME if a different 26151e0a012SSarah Sharp * vendor says otherwise. 26251e0a012SSarah Sharp */ 26351e0a012SSarah Sharp static void usb_set_lpm_sel(struct usb_device *udev, 26451e0a012SSarah Sharp struct usb3_lpm_parameters *udev_lpm_params) 26551e0a012SSarah Sharp { 26651e0a012SSarah Sharp struct usb_device *parent; 26751e0a012SSarah Sharp unsigned int num_hubs; 26851e0a012SSarah Sharp unsigned int total_sel; 26951e0a012SSarah Sharp 27051e0a012SSarah Sharp /* t1 = device PEL */ 27151e0a012SSarah Sharp total_sel = udev_lpm_params->pel; 27251e0a012SSarah Sharp /* How many external hubs are in between the device & the root port. */ 27351e0a012SSarah Sharp for (parent = udev->parent, num_hubs = 0; parent->parent; 27451e0a012SSarah Sharp parent = parent->parent) 27551e0a012SSarah Sharp num_hubs++; 27651e0a012SSarah Sharp /* t2 = 2.1us + 250ns * (num_hubs - 1) */ 27751e0a012SSarah Sharp if (num_hubs > 0) 27851e0a012SSarah Sharp total_sel += 2100 + 250 * (num_hubs - 1); 27951e0a012SSarah Sharp 28051e0a012SSarah Sharp /* t4 = 250ns * num_hubs */ 28151e0a012SSarah Sharp total_sel += 250 * num_hubs; 28251e0a012SSarah Sharp 28351e0a012SSarah Sharp udev_lpm_params->sel = total_sel; 28451e0a012SSarah Sharp } 28551e0a012SSarah Sharp 28651e0a012SSarah Sharp static void usb_set_lpm_parameters(struct usb_device *udev) 28751e0a012SSarah Sharp { 28851e0a012SSarah Sharp struct usb_hub *hub; 28951e0a012SSarah Sharp unsigned int port_to_port_delay; 29051e0a012SSarah Sharp unsigned int udev_u1_del; 29151e0a012SSarah Sharp unsigned int udev_u2_del; 29251e0a012SSarah Sharp unsigned int hub_u1_del; 29351e0a012SSarah Sharp unsigned int hub_u2_del; 29451e0a012SSarah Sharp 29551e0a012SSarah Sharp if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER) 29651e0a012SSarah Sharp return; 29751e0a012SSarah Sharp 298ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 29951e0a012SSarah Sharp /* It doesn't take time to transition the roothub into U0, since it 30051e0a012SSarah Sharp * doesn't have an upstream link. 30151e0a012SSarah Sharp */ 30251e0a012SSarah Sharp if (!hub) 30351e0a012SSarah Sharp return; 30451e0a012SSarah Sharp 30551e0a012SSarah Sharp udev_u1_del = udev->bos->ss_cap->bU1devExitLat; 3064d967995SXenia Ragiadakou udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); 30751e0a012SSarah Sharp hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; 3084d967995SXenia Ragiadakou hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); 30951e0a012SSarah Sharp 31051e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, 31151e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del); 31251e0a012SSarah Sharp 31351e0a012SSarah Sharp usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, 31451e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del); 31551e0a012SSarah Sharp 31651e0a012SSarah Sharp /* 31751e0a012SSarah Sharp * Appendix C, section C.2.2.2, says that there is a slight delay from 31851e0a012SSarah Sharp * when the parent hub notices the downstream port is trying to 31951e0a012SSarah Sharp * transition to U0 to when the hub initiates a U0 transition on its 32051e0a012SSarah Sharp * upstream port. The section says the delays are tPort2PortU1EL and 32151e0a012SSarah Sharp * tPort2PortU2EL, but it doesn't define what they are. 32251e0a012SSarah Sharp * 32351e0a012SSarah Sharp * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking 32451e0a012SSarah Sharp * about the same delays. Use the maximum delay calculations from those 32551e0a012SSarah Sharp * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For 32651e0a012SSarah Sharp * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I 32751e0a012SSarah Sharp * assume the device exit latencies they are talking about are the hub 32851e0a012SSarah Sharp * exit latencies. 32951e0a012SSarah Sharp * 33051e0a012SSarah Sharp * What do we do if the U2 exit latency is less than the U1 exit 33151e0a012SSarah Sharp * latency? It's possible, although not likely... 33251e0a012SSarah Sharp */ 33351e0a012SSarah Sharp port_to_port_delay = 1; 33451e0a012SSarah Sharp 33551e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, 33651e0a012SSarah Sharp hub, &udev->parent->u1_params, hub_u1_del, 33751e0a012SSarah Sharp port_to_port_delay); 33851e0a012SSarah Sharp 33951e0a012SSarah Sharp if (hub_u2_del > hub_u1_del) 34051e0a012SSarah Sharp port_to_port_delay = 1 + hub_u2_del - hub_u1_del; 34151e0a012SSarah Sharp else 34251e0a012SSarah Sharp port_to_port_delay = 1 + hub_u1_del; 34351e0a012SSarah Sharp 34451e0a012SSarah Sharp usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, 34551e0a012SSarah Sharp hub, &udev->parent->u2_params, hub_u2_del, 34651e0a012SSarah Sharp port_to_port_delay); 34751e0a012SSarah Sharp 34851e0a012SSarah Sharp /* Now that we've got PEL, calculate SEL. */ 34951e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u1_params); 35051e0a012SSarah Sharp usb_set_lpm_sel(udev, &udev->u2_params); 35151e0a012SSarah Sharp } 352d9b2099cSSarah Sharp 3531da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.4.5 */ 354dbe79bbeSJohn Youn static int get_hub_descriptor(struct usb_device *hdev, void *data) 3551da177e4SLinus Torvalds { 356dbe79bbeSJohn Youn int i, ret, size; 357dbe79bbeSJohn Youn unsigned dtype; 358dbe79bbeSJohn Youn 359dbe79bbeSJohn Youn if (hub_is_superspeed(hdev)) { 360dbe79bbeSJohn Youn dtype = USB_DT_SS_HUB; 361dbe79bbeSJohn Youn size = USB_DT_SS_HUB_SIZE; 362dbe79bbeSJohn Youn } else { 363dbe79bbeSJohn Youn dtype = USB_DT_HUB; 364dbe79bbeSJohn Youn size = sizeof(struct usb_hub_descriptor); 365dbe79bbeSJohn Youn } 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds for (i = 0; i < 3; i++) { 3681da177e4SLinus Torvalds ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 3691da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, 370dbe79bbeSJohn Youn dtype << 8, 0, data, size, 3711da177e4SLinus Torvalds USB_CTRL_GET_TIMEOUT); 3721da177e4SLinus Torvalds if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2)) 3731da177e4SLinus Torvalds return ret; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds return -EINVAL; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* 3791da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.1 3801da177e4SLinus Torvalds */ 3811da177e4SLinus Torvalds static int clear_hub_feature(struct usb_device *hdev, int feature) 3821da177e4SLinus Torvalds { 3831da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3841da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds /* 3881da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.2 3891da177e4SLinus Torvalds */ 390ad493e5eSLan Tianyu int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) 3911da177e4SLinus Torvalds { 3921da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 3931da177e4SLinus Torvalds USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, 3941da177e4SLinus Torvalds NULL, 0, 1000); 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds /* 3981da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.13 3991da177e4SLinus Torvalds */ 4001da177e4SLinus Torvalds static int set_port_feature(struct usb_device *hdev, int port1, int feature) 4011da177e4SLinus Torvalds { 4021da177e4SLinus Torvalds return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 4031da177e4SLinus Torvalds USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, 4041da177e4SLinus Torvalds NULL, 0, 1000); 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds /* 4081da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 4091da177e4SLinus Torvalds * for info about using port indicators 4101da177e4SLinus Torvalds */ 4111da177e4SLinus Torvalds static void set_port_led( 4121da177e4SLinus Torvalds struct usb_hub *hub, 4131da177e4SLinus Torvalds int port1, 4141da177e4SLinus Torvalds int selector 4151da177e4SLinus Torvalds ) 4161da177e4SLinus Torvalds { 4171da177e4SLinus Torvalds int status = set_port_feature(hub->hdev, (selector << 8) | port1, 4181da177e4SLinus Torvalds USB_PORT_FEAT_INDICATOR); 4191da177e4SLinus Torvalds if (status < 0) 4201da177e4SLinus Torvalds dev_dbg (hub->intfdev, 4211da177e4SLinus Torvalds "port %d indicator %s status %d\n", 4221da177e4SLinus Torvalds port1, 4231da177e4SLinus Torvalds ({ char *s; switch (selector) { 4241da177e4SLinus Torvalds case HUB_LED_AMBER: s = "amber"; break; 4251da177e4SLinus Torvalds case HUB_LED_GREEN: s = "green"; break; 4261da177e4SLinus Torvalds case HUB_LED_OFF: s = "off"; break; 4271da177e4SLinus Torvalds case HUB_LED_AUTO: s = "auto"; break; 4281da177e4SLinus Torvalds default: s = "??"; break; 4292b84f92bSJoe Perches } s; }), 4301da177e4SLinus Torvalds status); 4311da177e4SLinus Torvalds } 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds #define LED_CYCLE_PERIOD ((2*HZ)/3) 4341da177e4SLinus Torvalds 435c4028958SDavid Howells static void led_work (struct work_struct *work) 4361da177e4SLinus Torvalds { 437c4028958SDavid Howells struct usb_hub *hub = 438c4028958SDavid Howells container_of(work, struct usb_hub, leds.work); 4391da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 4401da177e4SLinus Torvalds unsigned i; 4411da177e4SLinus Torvalds unsigned changed = 0; 4421da177e4SLinus Torvalds int cursor = -1; 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) 4451da177e4SLinus Torvalds return; 4461da177e4SLinus Torvalds 4473bbc47d8SKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 4481da177e4SLinus Torvalds unsigned selector, mode; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds /* 30%-50% duty cycle */ 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds switch (hub->indicator[i]) { 4531da177e4SLinus Torvalds /* cycle marker */ 4541da177e4SLinus Torvalds case INDICATOR_CYCLE: 4551da177e4SLinus Torvalds cursor = i; 4561da177e4SLinus Torvalds selector = HUB_LED_AUTO; 4571da177e4SLinus Torvalds mode = INDICATOR_AUTO; 4581da177e4SLinus Torvalds break; 4591da177e4SLinus Torvalds /* blinking green = sw attention */ 4601da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK: 4611da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4621da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK_OFF; 4631da177e4SLinus Torvalds break; 4641da177e4SLinus Torvalds case INDICATOR_GREEN_BLINK_OFF: 4651da177e4SLinus Torvalds selector = HUB_LED_OFF; 4661da177e4SLinus Torvalds mode = INDICATOR_GREEN_BLINK; 4671da177e4SLinus Torvalds break; 4681da177e4SLinus Torvalds /* blinking amber = hw attention */ 4691da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK: 4701da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4711da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK_OFF; 4721da177e4SLinus Torvalds break; 4731da177e4SLinus Torvalds case INDICATOR_AMBER_BLINK_OFF: 4741da177e4SLinus Torvalds selector = HUB_LED_OFF; 4751da177e4SLinus Torvalds mode = INDICATOR_AMBER_BLINK; 4761da177e4SLinus Torvalds break; 4771da177e4SLinus Torvalds /* blink green/amber = reserved */ 4781da177e4SLinus Torvalds case INDICATOR_ALT_BLINK: 4791da177e4SLinus Torvalds selector = HUB_LED_GREEN; 4801da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK_OFF; 4811da177e4SLinus Torvalds break; 4821da177e4SLinus Torvalds case INDICATOR_ALT_BLINK_OFF: 4831da177e4SLinus Torvalds selector = HUB_LED_AMBER; 4841da177e4SLinus Torvalds mode = INDICATOR_ALT_BLINK; 4851da177e4SLinus Torvalds break; 4861da177e4SLinus Torvalds default: 4871da177e4SLinus Torvalds continue; 4881da177e4SLinus Torvalds } 4891da177e4SLinus Torvalds if (selector != HUB_LED_AUTO) 4901da177e4SLinus Torvalds changed = 1; 4911da177e4SLinus Torvalds set_port_led(hub, i + 1, selector); 4921da177e4SLinus Torvalds hub->indicator[i] = mode; 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds if (!changed && blinkenlights) { 4951da177e4SLinus Torvalds cursor++; 4963bbc47d8SKrzysztof Mazur cursor %= hdev->maxchild; 4971da177e4SLinus Torvalds set_port_led(hub, cursor + 1, HUB_LED_GREEN); 4981da177e4SLinus Torvalds hub->indicator[cursor] = INDICATOR_CYCLE; 4991da177e4SLinus Torvalds changed++; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds if (changed) 5021da177e4SLinus Torvalds schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds /* use a short timeout for hub/port status fetches */ 5061da177e4SLinus Torvalds #define USB_STS_TIMEOUT 1000 5071da177e4SLinus Torvalds #define USB_STS_RETRIES 5 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds /* 5101da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.6 5111da177e4SLinus Torvalds */ 5121da177e4SLinus Torvalds static int get_hub_status(struct usb_device *hdev, 5131da177e4SLinus Torvalds struct usb_hub_status *data) 5141da177e4SLinus Torvalds { 5151da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5161da177e4SLinus Torvalds 5173824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5183824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5191da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5201da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, 5211da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds return status; 5241da177e4SLinus Torvalds } 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds /* 5271da177e4SLinus Torvalds * USB 2.0 spec Section 11.24.2.7 5281da177e4SLinus Torvalds */ 5291da177e4SLinus Torvalds static int get_port_status(struct usb_device *hdev, int port1, 5301da177e4SLinus Torvalds struct usb_port_status *data) 5311da177e4SLinus Torvalds { 5321da177e4SLinus Torvalds int i, status = -ETIMEDOUT; 5331da177e4SLinus Torvalds 5343824c1ddSLibor Pechacek for (i = 0; i < USB_STS_RETRIES && 5353824c1ddSLibor Pechacek (status == -ETIMEDOUT || status == -EPIPE); i++) { 5361da177e4SLinus Torvalds status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), 5371da177e4SLinus Torvalds USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1, 5381da177e4SLinus Torvalds data, sizeof(*data), USB_STS_TIMEOUT); 5391da177e4SLinus Torvalds } 5401da177e4SLinus Torvalds return status; 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds 5433eb14915SAlan Stern static int hub_port_status(struct usb_hub *hub, int port1, 5443eb14915SAlan Stern u16 *status, u16 *change) 5453eb14915SAlan Stern { 5463eb14915SAlan Stern int ret; 5473eb14915SAlan Stern 5483eb14915SAlan Stern mutex_lock(&hub->status_mutex); 5493eb14915SAlan Stern ret = get_port_status(hub->hdev, port1, &hub->status->port); 5503eb14915SAlan Stern if (ret < 4) { 551e9e88fb7SAlan Stern if (ret != -ENODEV) 5523eb14915SAlan Stern dev_err(hub->intfdev, 5533eb14915SAlan Stern "%s failed (err = %d)\n", __func__, ret); 5543eb14915SAlan Stern if (ret >= 0) 5553eb14915SAlan Stern ret = -EIO; 5563eb14915SAlan Stern } else { 5573eb14915SAlan Stern *status = le16_to_cpu(hub->status->port.wPortStatus); 5583eb14915SAlan Stern *change = le16_to_cpu(hub->status->port.wPortChange); 559dbe79bbeSJohn Youn 5603eb14915SAlan Stern ret = 0; 5613eb14915SAlan Stern } 5623eb14915SAlan Stern mutex_unlock(&hub->status_mutex); 5633eb14915SAlan Stern return ret; 5643eb14915SAlan Stern } 5653eb14915SAlan Stern 5661da177e4SLinus Torvalds static void kick_khubd(struct usb_hub *hub) 5671da177e4SLinus Torvalds { 5681da177e4SLinus Torvalds unsigned long flags; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds spin_lock_irqsave(&hub_event_lock, flags); 5712e2c5eeaSRoel Kluin if (!hub->disconnected && list_empty(&hub->event_list)) { 5721da177e4SLinus Torvalds list_add_tail(&hub->event_list, &hub_event_list); 5738e4ceb38SAlan Stern 5748e4ceb38SAlan Stern /* Suppress autosuspend until khubd runs */ 5758e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 5768e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 5771da177e4SLinus Torvalds wake_up(&khubd_wait); 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds spin_unlock_irqrestore(&hub_event_lock, flags); 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds void usb_kick_khubd(struct usb_device *hdev) 5831da177e4SLinus Torvalds { 584ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 58525118084SAlan Stern 58625118084SAlan Stern if (hub) 58725118084SAlan Stern kick_khubd(hub); 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds 5904ee823b8SSarah Sharp /* 5914ee823b8SSarah Sharp * Let the USB core know that a USB 3.0 device has sent a Function Wake Device 5924ee823b8SSarah Sharp * Notification, which indicates it had initiated remote wakeup. 5934ee823b8SSarah Sharp * 5944ee823b8SSarah Sharp * USB 3.0 hubs do not report the port link state change from U3 to U0 when the 5954ee823b8SSarah Sharp * device initiates resume, so the USB core will not receive notice of the 5964ee823b8SSarah Sharp * resume through the normal hub interrupt URB. 5974ee823b8SSarah Sharp */ 5984ee823b8SSarah Sharp void usb_wakeup_notification(struct usb_device *hdev, 5994ee823b8SSarah Sharp unsigned int portnum) 6004ee823b8SSarah Sharp { 6014ee823b8SSarah Sharp struct usb_hub *hub; 6024ee823b8SSarah Sharp 6034ee823b8SSarah Sharp if (!hdev) 6044ee823b8SSarah Sharp return; 6054ee823b8SSarah Sharp 606ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(hdev); 6074ee823b8SSarah Sharp if (hub) { 6084ee823b8SSarah Sharp set_bit(portnum, hub->wakeup_bits); 6094ee823b8SSarah Sharp kick_khubd(hub); 6104ee823b8SSarah Sharp } 6114ee823b8SSarah Sharp } 6124ee823b8SSarah Sharp EXPORT_SYMBOL_GPL(usb_wakeup_notification); 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds /* completion function, fires on port status changes and various faults */ 6157d12e780SDavid Howells static void hub_irq(struct urb *urb) 6161da177e4SLinus Torvalds { 617ec17cf1cSTobias Klauser struct usb_hub *hub = urb->context; 618e015268dSAlan Stern int status = urb->status; 61971d2718fSRoel Kluin unsigned i; 6201da177e4SLinus Torvalds unsigned long bits; 6211da177e4SLinus Torvalds 622e015268dSAlan Stern switch (status) { 6231da177e4SLinus Torvalds case -ENOENT: /* synchronous unlink */ 6241da177e4SLinus Torvalds case -ECONNRESET: /* async unlink */ 6251da177e4SLinus Torvalds case -ESHUTDOWN: /* hardware going away */ 6261da177e4SLinus Torvalds return; 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds default: /* presumably an error */ 6291da177e4SLinus Torvalds /* Cause a hub reset after 10 consecutive errors */ 630e015268dSAlan Stern dev_dbg (hub->intfdev, "transfer --> %d\n", status); 6311da177e4SLinus Torvalds if ((++hub->nerrors < 10) || hub->error) 6321da177e4SLinus Torvalds goto resubmit; 633e015268dSAlan Stern hub->error = status; 6341da177e4SLinus Torvalds /* FALL THROUGH */ 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvalds /* let khubd handle things */ 6371da177e4SLinus Torvalds case 0: /* we got data: port status changed */ 6381da177e4SLinus Torvalds bits = 0; 6391da177e4SLinus Torvalds for (i = 0; i < urb->actual_length; ++i) 6401da177e4SLinus Torvalds bits |= ((unsigned long) ((*hub->buffer)[i])) 6411da177e4SLinus Torvalds << (i*8); 6421da177e4SLinus Torvalds hub->event_bits[0] = bits; 6431da177e4SLinus Torvalds break; 6441da177e4SLinus Torvalds } 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvalds hub->nerrors = 0; 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvalds /* Something happened, let khubd figure it out */ 6491da177e4SLinus Torvalds kick_khubd(hub); 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds resubmit: 6521da177e4SLinus Torvalds if (hub->quiescing) 6531da177e4SLinus Torvalds return; 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0 6561da177e4SLinus Torvalds && status != -ENODEV && status != -EPERM) 6571da177e4SLinus Torvalds dev_err (hub->intfdev, "resubmit --> %d\n", status); 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds /* USB 2.0 spec Section 11.24.2.3 */ 6611da177e4SLinus Torvalds static inline int 6621da177e4SLinus Torvalds hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt) 6631da177e4SLinus Torvalds { 6642c7b871bSWilliam Gulland /* Need to clear both directions for control ep */ 6652c7b871bSWilliam Gulland if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == 6662c7b871bSWilliam Gulland USB_ENDPOINT_XFER_CONTROL) { 6672c7b871bSWilliam Gulland int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6682c7b871bSWilliam Gulland HUB_CLEAR_TT_BUFFER, USB_RT_PORT, 6692c7b871bSWilliam Gulland devinfo ^ 0x8000, tt, NULL, 0, 1000); 6702c7b871bSWilliam Gulland if (status) 6712c7b871bSWilliam Gulland return status; 6722c7b871bSWilliam Gulland } 673c2f6595fSAlan Stern return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 6741da177e4SLinus Torvalds HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, 6751da177e4SLinus Torvalds tt, NULL, 0, 1000); 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds 6781da177e4SLinus Torvalds /* 6791da177e4SLinus Torvalds * enumeration blocks khubd for a long time. we use keventd instead, since 6801da177e4SLinus Torvalds * long blocking there is the exception, not the rule. accordingly, HCDs 6811da177e4SLinus Torvalds * talking to TTs must queue control transfers (not just bulk and iso), so 6821da177e4SLinus Torvalds * both can talk to the same hub concurrently. 6831da177e4SLinus Torvalds */ 684cb88a1b8SAlan Stern static void hub_tt_work(struct work_struct *work) 6851da177e4SLinus Torvalds { 686c4028958SDavid Howells struct usb_hub *hub = 687cb88a1b8SAlan Stern container_of(work, struct usb_hub, tt.clear_work); 6881da177e4SLinus Torvalds unsigned long flags; 6891da177e4SLinus Torvalds 6901da177e4SLinus Torvalds spin_lock_irqsave (&hub->tt.lock, flags); 6913b6054daSOctavian Purdila while (!list_empty(&hub->tt.clear_list)) { 692d0f830d3SH Hartley Sweeten struct list_head *next; 6931da177e4SLinus Torvalds struct usb_tt_clear *clear; 6941da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 695cb88a1b8SAlan Stern const struct hc_driver *drv; 6961da177e4SLinus Torvalds int status; 6971da177e4SLinus Torvalds 698d0f830d3SH Hartley Sweeten next = hub->tt.clear_list.next; 699d0f830d3SH Hartley Sweeten clear = list_entry (next, struct usb_tt_clear, clear_list); 7001da177e4SLinus Torvalds list_del (&clear->clear_list); 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds /* drop lock so HCD can concurrently report other TT errors */ 7031da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7041da177e4SLinus Torvalds status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt); 705e9e88fb7SAlan Stern if (status && status != -ENODEV) 7061da177e4SLinus Torvalds dev_err (&hdev->dev, 7071da177e4SLinus Torvalds "clear tt %d (%04x) error %d\n", 7081da177e4SLinus Torvalds clear->tt, clear->devinfo, status); 709cb88a1b8SAlan Stern 710cb88a1b8SAlan Stern /* Tell the HCD, even if the operation failed */ 711cb88a1b8SAlan Stern drv = clear->hcd->driver; 712cb88a1b8SAlan Stern if (drv->clear_tt_buffer_complete) 713cb88a1b8SAlan Stern (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); 714cb88a1b8SAlan Stern 7151da177e4SLinus Torvalds kfree(clear); 716cb88a1b8SAlan Stern spin_lock_irqsave(&hub->tt.lock, flags); 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds spin_unlock_irqrestore (&hub->tt.lock, flags); 7191da177e4SLinus Torvalds } 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds /** 722971fcd49SLan Tianyu * usb_hub_set_port_power - control hub port's power state 72341341261SMathias Nyman * @hdev: USB device belonging to the usb hub 72441341261SMathias Nyman * @hub: target hub 725971fcd49SLan Tianyu * @port1: port index 726971fcd49SLan Tianyu * @set: expected status 727971fcd49SLan Tianyu * 728971fcd49SLan Tianyu * call this function to control port's power via setting or 729971fcd49SLan Tianyu * clearing the port's PORT_POWER feature. 730626f090cSYacine Belkadi * 731626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 732971fcd49SLan Tianyu */ 73341341261SMathias Nyman int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, 73441341261SMathias Nyman int port1, bool set) 735971fcd49SLan Tianyu { 736971fcd49SLan Tianyu int ret; 737ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 738971fcd49SLan Tianyu 739971fcd49SLan Tianyu if (set) 740971fcd49SLan Tianyu ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 741971fcd49SLan Tianyu else 742ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 743ad493e5eSLan Tianyu 744ad493e5eSLan Tianyu if (!ret) 745ad493e5eSLan Tianyu port_dev->power_is_on = set; 746971fcd49SLan Tianyu return ret; 747971fcd49SLan Tianyu } 748971fcd49SLan Tianyu 749971fcd49SLan Tianyu /** 750cb88a1b8SAlan Stern * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub 751cb88a1b8SAlan Stern * @urb: an URB associated with the failed or incomplete split transaction 7521da177e4SLinus Torvalds * 7531da177e4SLinus Torvalds * High speed HCDs use this to tell the hub driver that some split control or 7541da177e4SLinus Torvalds * bulk transaction failed in a way that requires clearing internal state of 7551da177e4SLinus Torvalds * a transaction translator. This is normally detected (and reported) from 7561da177e4SLinus Torvalds * interrupt context. 7571da177e4SLinus Torvalds * 7581da177e4SLinus Torvalds * It may not be possible for that hub to handle additional full (or low) 7591da177e4SLinus Torvalds * speed transactions until that state is fully cleared out. 760626f090cSYacine Belkadi * 761626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 7621da177e4SLinus Torvalds */ 763cb88a1b8SAlan Stern int usb_hub_clear_tt_buffer(struct urb *urb) 7641da177e4SLinus Torvalds { 765cb88a1b8SAlan Stern struct usb_device *udev = urb->dev; 766cb88a1b8SAlan Stern int pipe = urb->pipe; 7671da177e4SLinus Torvalds struct usb_tt *tt = udev->tt; 7681da177e4SLinus Torvalds unsigned long flags; 7691da177e4SLinus Torvalds struct usb_tt_clear *clear; 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds /* we've got to cope with an arbitrary number of pending TT clears, 7721da177e4SLinus Torvalds * since each TT has "at least two" buffers that can need it (and 7731da177e4SLinus Torvalds * there can be many TTs per hub). even if they're uncommon. 7741da177e4SLinus Torvalds */ 77554e6ecb2SChristoph Lameter if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) { 7761da177e4SLinus Torvalds dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); 7771da177e4SLinus Torvalds /* FIXME recover somehow ... RESET_TT? */ 778cb88a1b8SAlan Stern return -ENOMEM; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds /* info that CLEAR_TT_BUFFER needs */ 7821da177e4SLinus Torvalds clear->tt = tt->multi ? udev->ttport : 1; 7831da177e4SLinus Torvalds clear->devinfo = usb_pipeendpoint (pipe); 7841da177e4SLinus Torvalds clear->devinfo |= udev->devnum << 4; 7851da177e4SLinus Torvalds clear->devinfo |= usb_pipecontrol (pipe) 7861da177e4SLinus Torvalds ? (USB_ENDPOINT_XFER_CONTROL << 11) 7871da177e4SLinus Torvalds : (USB_ENDPOINT_XFER_BULK << 11); 7881da177e4SLinus Torvalds if (usb_pipein (pipe)) 7891da177e4SLinus Torvalds clear->devinfo |= 1 << 15; 7901da177e4SLinus Torvalds 791cb88a1b8SAlan Stern /* info for completion callback */ 792cb88a1b8SAlan Stern clear->hcd = bus_to_hcd(udev->bus); 793cb88a1b8SAlan Stern clear->ep = urb->ep; 794cb88a1b8SAlan Stern 7951da177e4SLinus Torvalds /* tell keventd to clear state for this TT */ 7961da177e4SLinus Torvalds spin_lock_irqsave (&tt->lock, flags); 7971da177e4SLinus Torvalds list_add_tail (&clear->clear_list, &tt->clear_list); 798cb88a1b8SAlan Stern schedule_work(&tt->clear_work); 7991da177e4SLinus Torvalds spin_unlock_irqrestore (&tt->lock, flags); 800cb88a1b8SAlan Stern return 0; 8011da177e4SLinus Torvalds } 802cb88a1b8SAlan Stern EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); 8031da177e4SLinus Torvalds 8048520f380SAlan Stern /* If do_delay is false, return the number of milliseconds the caller 8058520f380SAlan Stern * needs to delay. 8068520f380SAlan Stern */ 8078520f380SAlan Stern static unsigned hub_power_on(struct usb_hub *hub, bool do_delay) 8081da177e4SLinus Torvalds { 8091da177e4SLinus Torvalds int port1; 810b789696aSDavid Brownell unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2; 8118520f380SAlan Stern unsigned delay; 8124489a571SAlan Stern u16 wHubCharacteristics = 8134489a571SAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 8141da177e4SLinus Torvalds 8154489a571SAlan Stern /* Enable power on each port. Some hubs have reserved values 8164489a571SAlan Stern * of LPSM (> 2) in their descriptors, even though they are 8174489a571SAlan Stern * USB 2.0 hubs. Some hubs do not implement port-power switching 8184489a571SAlan Stern * but only emulate it. In all cases, the ports won't work 8194489a571SAlan Stern * unless we send these messages to the hub. 8204489a571SAlan Stern */ 8214489a571SAlan Stern if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2) 8221da177e4SLinus Torvalds dev_dbg(hub->intfdev, "enabling power on all ports\n"); 8234489a571SAlan Stern else 8244489a571SAlan Stern dev_dbg(hub->intfdev, "trying to enable port power on " 8254489a571SAlan Stern "non-switchable hub\n"); 8263bbc47d8SKrzysztof Mazur for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) 827ad493e5eSLan Tianyu if (hub->ports[port1 - 1]->power_is_on) 8284489a571SAlan Stern set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); 829ad493e5eSLan Tianyu else 830ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 831ad493e5eSLan Tianyu USB_PORT_FEAT_POWER); 8321da177e4SLinus Torvalds 833b789696aSDavid Brownell /* Wait at least 100 msec for power to become stable */ 8348520f380SAlan Stern delay = max(pgood_delay, (unsigned) 100); 8358520f380SAlan Stern if (do_delay) 8368520f380SAlan Stern msleep(delay); 8378520f380SAlan Stern return delay; 8381da177e4SLinus Torvalds } 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvalds static int hub_hub_status(struct usb_hub *hub, 8411da177e4SLinus Torvalds u16 *status, u16 *change) 8421da177e4SLinus Torvalds { 8431da177e4SLinus Torvalds int ret; 8441da177e4SLinus Torvalds 845db90e7a1SAlan Stern mutex_lock(&hub->status_mutex); 8461da177e4SLinus Torvalds ret = get_hub_status(hub->hdev, &hub->status->hub); 847e9e88fb7SAlan Stern if (ret < 0) { 848e9e88fb7SAlan Stern if (ret != -ENODEV) 8491da177e4SLinus Torvalds dev_err(hub->intfdev, 850441b62c1SHarvey Harrison "%s failed (err = %d)\n", __func__, ret); 851e9e88fb7SAlan Stern } else { 8521da177e4SLinus Torvalds *status = le16_to_cpu(hub->status->hub.wHubStatus); 8531da177e4SLinus Torvalds *change = le16_to_cpu(hub->status->hub.wHubChange); 8541da177e4SLinus Torvalds ret = 0; 8551da177e4SLinus Torvalds } 856db90e7a1SAlan Stern mutex_unlock(&hub->status_mutex); 8571da177e4SLinus Torvalds return ret; 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds 86041e7e056SSarah Sharp static int hub_set_port_link_state(struct usb_hub *hub, int port1, 86141e7e056SSarah Sharp unsigned int link_status) 86241e7e056SSarah Sharp { 86341e7e056SSarah Sharp return set_port_feature(hub->hdev, 86441e7e056SSarah Sharp port1 | (link_status << 3), 86541e7e056SSarah Sharp USB_PORT_FEAT_LINK_STATE); 86641e7e056SSarah Sharp } 86741e7e056SSarah Sharp 86841e7e056SSarah Sharp /* 86941e7e056SSarah Sharp * If USB 3.0 ports are placed into the Disabled state, they will no longer 87041e7e056SSarah Sharp * detect any device connects or disconnects. This is generally not what the 87141e7e056SSarah Sharp * USB core wants, since it expects a disabled port to produce a port status 87241e7e056SSarah Sharp * change event when a new device connects. 87341e7e056SSarah Sharp * 87441e7e056SSarah Sharp * Instead, set the link state to Disabled, wait for the link to settle into 87541e7e056SSarah Sharp * that state, clear any change bits, and then put the port into the RxDetect 87641e7e056SSarah Sharp * state. 87741e7e056SSarah Sharp */ 87841e7e056SSarah Sharp static int hub_usb3_port_disable(struct usb_hub *hub, int port1) 87941e7e056SSarah Sharp { 88041e7e056SSarah Sharp int ret; 88141e7e056SSarah Sharp int total_time; 88241e7e056SSarah Sharp u16 portchange, portstatus; 88341e7e056SSarah Sharp 88441e7e056SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 88541e7e056SSarah Sharp return -EINVAL; 88641e7e056SSarah Sharp 88741e7e056SSarah Sharp ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED); 888e9e88fb7SAlan Stern if (ret) 88941e7e056SSarah Sharp return ret; 89041e7e056SSarah Sharp 89141e7e056SSarah Sharp /* Wait for the link to enter the disabled state. */ 89241e7e056SSarah Sharp for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 89341e7e056SSarah Sharp ret = hub_port_status(hub, port1, &portstatus, &portchange); 89441e7e056SSarah Sharp if (ret < 0) 89541e7e056SSarah Sharp return ret; 89641e7e056SSarah Sharp 89741e7e056SSarah Sharp if ((portstatus & USB_PORT_STAT_LINK_STATE) == 89841e7e056SSarah Sharp USB_SS_PORT_LS_SS_DISABLED) 89941e7e056SSarah Sharp break; 90041e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 90141e7e056SSarah Sharp break; 90241e7e056SSarah Sharp msleep(HUB_DEBOUNCE_STEP); 90341e7e056SSarah Sharp } 90441e7e056SSarah Sharp if (total_time >= HUB_DEBOUNCE_TIMEOUT) 90541e7e056SSarah Sharp dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n", 90641e7e056SSarah Sharp port1, total_time); 90741e7e056SSarah Sharp 90841e7e056SSarah Sharp return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT); 90941e7e056SSarah Sharp } 91041e7e056SSarah Sharp 9118b28c752SAlan Stern static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) 9128b28c752SAlan Stern { 9138b28c752SAlan Stern struct usb_device *hdev = hub->hdev; 9140458d5b4SAlan Stern int ret = 0; 9158b28c752SAlan Stern 916ff823c79SLan Tianyu if (hub->ports[port1 - 1]->child && set_state) 917ff823c79SLan Tianyu usb_set_device_state(hub->ports[port1 - 1]->child, 9188b28c752SAlan Stern USB_STATE_NOTATTACHED); 91941e7e056SSarah Sharp if (!hub->error) { 92041e7e056SSarah Sharp if (hub_is_superspeed(hub->hdev)) 92141e7e056SSarah Sharp ret = hub_usb3_port_disable(hub, port1); 92241e7e056SSarah Sharp else 923ad493e5eSLan Tianyu ret = usb_clear_port_feature(hdev, port1, 92441e7e056SSarah Sharp USB_PORT_FEAT_ENABLE); 92541e7e056SSarah Sharp } 926e9e88fb7SAlan Stern if (ret && ret != -ENODEV) 9278b28c752SAlan Stern dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", 9288b28c752SAlan Stern port1, ret); 9298b28c752SAlan Stern return ret; 9308b28c752SAlan Stern } 9318b28c752SAlan Stern 9320458d5b4SAlan Stern /* 9336d42fcdbSJustin P. Mattock * Disable a port and mark a logical connect-change event, so that some 9340458d5b4SAlan Stern * time later khubd will disconnect() any existing usb_device on the port 9350458d5b4SAlan Stern * and will re-enumerate if there actually is a device attached. 9360458d5b4SAlan Stern */ 9370458d5b4SAlan Stern static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) 9387d069b7dSAlan Stern { 9390458d5b4SAlan Stern dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); 9400458d5b4SAlan Stern hub_port_disable(hub, port1, 1); 9410458d5b4SAlan Stern 9420458d5b4SAlan Stern /* FIXME let caller ask to power down the port: 9430458d5b4SAlan Stern * - some devices won't enumerate without a VBUS power cycle 9440458d5b4SAlan Stern * - SRP saves power that way 9450458d5b4SAlan Stern * - ... new call, TBD ... 9460458d5b4SAlan Stern * That's easy if this hub can switch power per-port, and 9470458d5b4SAlan Stern * khubd reactivates the port later (timer, SRP, etc). 9480458d5b4SAlan Stern * Powerdown must be optional, because of reset/DFU. 9490458d5b4SAlan Stern */ 9500458d5b4SAlan Stern 9510458d5b4SAlan Stern set_bit(port1, hub->change_bits); 9520458d5b4SAlan Stern kick_khubd(hub); 9530458d5b4SAlan Stern } 9540458d5b4SAlan Stern 955253e0572SAlan Stern /** 956253e0572SAlan Stern * usb_remove_device - disable a device's port on its parent hub 957253e0572SAlan Stern * @udev: device to be disabled and removed 958253e0572SAlan Stern * Context: @udev locked, must be able to sleep. 959253e0572SAlan Stern * 960253e0572SAlan Stern * After @udev's port has been disabled, khubd is notified and it will 961253e0572SAlan Stern * see that the device has been disconnected. When the device is 962253e0572SAlan Stern * physically unplugged and something is plugged in, the events will 963253e0572SAlan Stern * be received and processed normally. 964626f090cSYacine Belkadi * 965626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 966253e0572SAlan Stern */ 967253e0572SAlan Stern int usb_remove_device(struct usb_device *udev) 968253e0572SAlan Stern { 969253e0572SAlan Stern struct usb_hub *hub; 970253e0572SAlan Stern struct usb_interface *intf; 971253e0572SAlan Stern 972253e0572SAlan Stern if (!udev->parent) /* Can't remove a root hub */ 973253e0572SAlan Stern return -EINVAL; 974ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 975253e0572SAlan Stern intf = to_usb_interface(hub->intfdev); 976253e0572SAlan Stern 977253e0572SAlan Stern usb_autopm_get_interface(intf); 978253e0572SAlan Stern set_bit(udev->portnum, hub->removed_bits); 979253e0572SAlan Stern hub_port_logical_disconnect(hub, udev->portnum); 980253e0572SAlan Stern usb_autopm_put_interface(intf); 981253e0572SAlan Stern return 0; 982253e0572SAlan Stern } 983253e0572SAlan Stern 9846ee0b270SAlan Stern enum hub_activation_type { 9858e4ceb38SAlan Stern HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ 9868520f380SAlan Stern HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, 9876ee0b270SAlan Stern }; 9885e6effaeSAlan Stern 9898520f380SAlan Stern static void hub_init_func2(struct work_struct *ws); 9908520f380SAlan Stern static void hub_init_func3(struct work_struct *ws); 9918520f380SAlan Stern 992f2835219SAlan Stern static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) 9935e6effaeSAlan Stern { 9945e6effaeSAlan Stern struct usb_device *hdev = hub->hdev; 995653a39d1SSarah Sharp struct usb_hcd *hcd; 996653a39d1SSarah Sharp int ret; 9975e6effaeSAlan Stern int port1; 998f2835219SAlan Stern int status; 999948fea37SAlan Stern bool need_debounce_delay = false; 10008520f380SAlan Stern unsigned delay; 10018520f380SAlan Stern 10028520f380SAlan Stern /* Continue a partial initialization */ 10038520f380SAlan Stern if (type == HUB_INIT2) 10048520f380SAlan Stern goto init2; 10058520f380SAlan Stern if (type == HUB_INIT3) 10068520f380SAlan Stern goto init3; 10075e6effaeSAlan Stern 1008a45aa3b3SElric Fu /* The superspeed hub except for root hub has to use Hub Depth 1009a45aa3b3SElric Fu * value as an offset into the route string to locate the bits 1010a45aa3b3SElric Fu * it uses to determine the downstream port number. So hub driver 1011a45aa3b3SElric Fu * should send a set hub depth request to superspeed hub after 1012a45aa3b3SElric Fu * the superspeed hub is set configuration in initialization or 1013a45aa3b3SElric Fu * reset procedure. 1014a45aa3b3SElric Fu * 1015a45aa3b3SElric Fu * After a resume, port power should still be on. 1016f2835219SAlan Stern * For any other type of activation, turn it on. 1017f2835219SAlan Stern */ 10188520f380SAlan Stern if (type != HUB_RESUME) { 1019a45aa3b3SElric Fu if (hdev->parent && hub_is_superspeed(hdev)) { 1020a45aa3b3SElric Fu ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), 1021a45aa3b3SElric Fu HUB_SET_DEPTH, USB_RT_HUB, 1022a45aa3b3SElric Fu hdev->level - 1, 0, NULL, 0, 1023a45aa3b3SElric Fu USB_CTRL_SET_TIMEOUT); 1024a45aa3b3SElric Fu if (ret < 0) 1025a45aa3b3SElric Fu dev_err(hub->intfdev, 1026a45aa3b3SElric Fu "set hub depth failed\n"); 1027a45aa3b3SElric Fu } 10288520f380SAlan Stern 10298520f380SAlan Stern /* Speed up system boot by using a delayed_work for the 10308520f380SAlan Stern * hub's initial power-up delays. This is pretty awkward 10318520f380SAlan Stern * and the implementation looks like a home-brewed sort of 10328520f380SAlan Stern * setjmp/longjmp, but it saves at least 100 ms for each 10338520f380SAlan Stern * root hub (assuming usbcore is compiled into the kernel 10348520f380SAlan Stern * rather than as a module). It adds up. 10358520f380SAlan Stern * 10368520f380SAlan Stern * This can't be done for HUB_RESUME or HUB_RESET_RESUME 10378520f380SAlan Stern * because for those activation types the ports have to be 10388520f380SAlan Stern * operational when we return. In theory this could be done 10398520f380SAlan Stern * for HUB_POST_RESET, but it's easier not to. 10408520f380SAlan Stern */ 10418520f380SAlan Stern if (type == HUB_INIT) { 10428520f380SAlan Stern delay = hub_power_on(hub, false); 104377fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); 10448520f380SAlan Stern schedule_delayed_work(&hub->init_work, 10458520f380SAlan Stern msecs_to_jiffies(delay)); 104661fbeba1SAlan Stern 104761fbeba1SAlan Stern /* Suppress autosuspend until init is done */ 10488e4ceb38SAlan Stern usb_autopm_get_interface_no_resume( 10498e4ceb38SAlan Stern to_usb_interface(hub->intfdev)); 10508520f380SAlan Stern return; /* Continues at init2: below */ 1051653a39d1SSarah Sharp } else if (type == HUB_RESET_RESUME) { 1052653a39d1SSarah Sharp /* The internal host controller state for the hub device 1053653a39d1SSarah Sharp * may be gone after a host power loss on system resume. 1054653a39d1SSarah Sharp * Update the device's info so the HW knows it's a hub. 1055653a39d1SSarah Sharp */ 1056653a39d1SSarah Sharp hcd = bus_to_hcd(hdev->bus); 1057653a39d1SSarah Sharp if (hcd->driver->update_hub_device) { 1058653a39d1SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1059653a39d1SSarah Sharp &hub->tt, GFP_NOIO); 1060653a39d1SSarah Sharp if (ret < 0) { 1061653a39d1SSarah Sharp dev_err(hub->intfdev, "Host not " 1062653a39d1SSarah Sharp "accepting hub info " 1063653a39d1SSarah Sharp "update.\n"); 1064653a39d1SSarah Sharp dev_err(hub->intfdev, "LS/FS devices " 1065653a39d1SSarah Sharp "and hubs may not work " 1066653a39d1SSarah Sharp "under this hub\n."); 1067653a39d1SSarah Sharp } 1068653a39d1SSarah Sharp } 1069653a39d1SSarah Sharp hub_power_on(hub, true); 10708520f380SAlan Stern } else { 10718520f380SAlan Stern hub_power_on(hub, true); 10728520f380SAlan Stern } 10738520f380SAlan Stern } 10748520f380SAlan Stern init2: 1075f2835219SAlan Stern 10766ee0b270SAlan Stern /* Check each port and set hub->change_bits to let khubd know 10776ee0b270SAlan Stern * which ports need attention. 10785e6effaeSAlan Stern */ 10795e6effaeSAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 1080ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 10815e6effaeSAlan Stern u16 portstatus, portchange; 10825e6effaeSAlan Stern 10836ee0b270SAlan Stern portstatus = portchange = 0; 10846ee0b270SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 10856ee0b270SAlan Stern if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) 10866ee0b270SAlan Stern dev_dbg(hub->intfdev, 10876ee0b270SAlan Stern "port %d: status %04x change %04x\n", 10886ee0b270SAlan Stern port1, portstatus, portchange); 10895e6effaeSAlan Stern 10906ee0b270SAlan Stern /* After anything other than HUB_RESUME (i.e., initialization 10916ee0b270SAlan Stern * or any sort of reset), every port should be disabled. 10926ee0b270SAlan Stern * Unconnected ports should likewise be disabled (paranoia), 10936ee0b270SAlan Stern * and so should ports for which we have no usb_device. 10945e6effaeSAlan Stern */ 10956ee0b270SAlan Stern if ((portstatus & USB_PORT_STAT_ENABLE) && ( 10966ee0b270SAlan Stern type != HUB_RESUME || 10976ee0b270SAlan Stern !(portstatus & USB_PORT_STAT_CONNECTION) || 10986ee0b270SAlan Stern !udev || 10996ee0b270SAlan Stern udev->state == USB_STATE_NOTATTACHED)) { 11009f0a6cd3SAndiry Xu /* 11019f0a6cd3SAndiry Xu * USB3 protocol ports will automatically transition 11029f0a6cd3SAndiry Xu * to Enabled state when detect an USB3.0 device attach. 1103fd1ac4cfSDan Williams * Do not disable USB3 protocol ports, just pretend 1104fd1ac4cfSDan Williams * power was lost 11059f0a6cd3SAndiry Xu */ 1106fd1ac4cfSDan Williams portstatus &= ~USB_PORT_STAT_ENABLE; 1107fd1ac4cfSDan Williams if (!hub_is_superspeed(hdev)) 1108ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port1, 11099f0a6cd3SAndiry Xu USB_PORT_FEAT_ENABLE); 11109f0a6cd3SAndiry Xu } 11116ee0b270SAlan Stern 1112948fea37SAlan Stern /* Clear status-change flags; we'll debounce later */ 1113948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) { 1114948fea37SAlan Stern need_debounce_delay = true; 1115ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1116948fea37SAlan Stern USB_PORT_FEAT_C_CONNECTION); 1117948fea37SAlan Stern } 1118948fea37SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) { 1119948fea37SAlan Stern need_debounce_delay = true; 1120ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 1121948fea37SAlan Stern USB_PORT_FEAT_C_ENABLE); 1122948fea37SAlan Stern } 1123e92aee33SJulius Werner if (portchange & USB_PORT_STAT_C_RESET) { 1124e92aee33SJulius Werner need_debounce_delay = true; 1125e92aee33SJulius Werner usb_clear_port_feature(hub->hdev, port1, 1126e92aee33SJulius Werner USB_PORT_FEAT_C_RESET); 1127e92aee33SJulius Werner } 112879c3dd81SDon Zickus if ((portchange & USB_PORT_STAT_C_BH_RESET) && 112979c3dd81SDon Zickus hub_is_superspeed(hub->hdev)) { 113079c3dd81SDon Zickus need_debounce_delay = true; 1131ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 113279c3dd81SDon Zickus USB_PORT_FEAT_C_BH_PORT_RESET); 113379c3dd81SDon Zickus } 1134253e0572SAlan Stern /* We can forget about a "removed" device when there's a 1135253e0572SAlan Stern * physical disconnect or the connect status changes. 1136253e0572SAlan Stern */ 1137253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 1138253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 1139253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 1140253e0572SAlan Stern 11416ee0b270SAlan Stern if (!udev || udev->state == USB_STATE_NOTATTACHED) { 11426ee0b270SAlan Stern /* Tell khubd to disconnect the device or 11436ee0b270SAlan Stern * check for a new connection 11446ee0b270SAlan Stern */ 114508d1dec6SShen Guang if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || 114608d1dec6SShen Guang (portstatus & USB_PORT_STAT_OVERCURRENT)) 11476ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11486ee0b270SAlan Stern 11496ee0b270SAlan Stern } else if (portstatus & USB_PORT_STAT_ENABLE) { 115072937e1eSSarah Sharp bool port_resumed = (portstatus & 115172937e1eSSarah Sharp USB_PORT_STAT_LINK_STATE) == 115272937e1eSSarah Sharp USB_SS_PORT_LS_U0; 11536ee0b270SAlan Stern /* The power session apparently survived the resume. 11546ee0b270SAlan Stern * If there was an overcurrent or suspend change 11556ee0b270SAlan Stern * (i.e., remote wakeup request), have khubd 115672937e1eSSarah Sharp * take care of it. Look at the port link state 115772937e1eSSarah Sharp * for USB 3.0 hubs, since they don't have a suspend 115872937e1eSSarah Sharp * change bit, and they don't set the port link change 115972937e1eSSarah Sharp * bit on device-initiated resume. 11606ee0b270SAlan Stern */ 116172937e1eSSarah Sharp if (portchange || (hub_is_superspeed(hub->hdev) && 116272937e1eSSarah Sharp port_resumed)) 11636ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11646ee0b270SAlan Stern 11656ee0b270SAlan Stern } else if (udev->persist_enabled) { 1166ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[port1 - 1]; 1167ad493e5eSLan Tianyu 11686ee0b270SAlan Stern #ifdef CONFIG_PM 11695e6effaeSAlan Stern udev->reset_resume = 1; 11706ee0b270SAlan Stern #endif 1171ad493e5eSLan Tianyu /* Don't set the change_bits when the device 1172ad493e5eSLan Tianyu * was powered off. 1173ad493e5eSLan Tianyu */ 1174ad493e5eSLan Tianyu if (port_dev->power_is_on) 11758808f00cSAlan Stern set_bit(port1, hub->change_bits); 11768808f00cSAlan Stern 11776ee0b270SAlan Stern } else { 11786ee0b270SAlan Stern /* The power session is gone; tell khubd */ 11796ee0b270SAlan Stern usb_set_device_state(udev, USB_STATE_NOTATTACHED); 11806ee0b270SAlan Stern set_bit(port1, hub->change_bits); 11815e6effaeSAlan Stern } 11825e6effaeSAlan Stern } 11835e6effaeSAlan Stern 1184948fea37SAlan Stern /* If no port-status-change flags were set, we don't need any 1185948fea37SAlan Stern * debouncing. If flags were set we can try to debounce the 1186948fea37SAlan Stern * ports all at once right now, instead of letting khubd do them 1187948fea37SAlan Stern * one at a time later on. 1188948fea37SAlan Stern * 1189948fea37SAlan Stern * If any port-status changes do occur during this delay, khubd 1190948fea37SAlan Stern * will see them later and handle them normally. 1191948fea37SAlan Stern */ 11928520f380SAlan Stern if (need_debounce_delay) { 11938520f380SAlan Stern delay = HUB_DEBOUNCE_STABLE; 1194f2835219SAlan Stern 11958520f380SAlan Stern /* Don't do a long sleep inside a workqueue routine */ 11968520f380SAlan Stern if (type == HUB_INIT2) { 119777fa83cfSTejun Heo INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); 11988520f380SAlan Stern schedule_delayed_work(&hub->init_work, 11998520f380SAlan Stern msecs_to_jiffies(delay)); 12008520f380SAlan Stern return; /* Continues at init3: below */ 12018520f380SAlan Stern } else { 12028520f380SAlan Stern msleep(delay); 12038520f380SAlan Stern } 12048520f380SAlan Stern } 12058520f380SAlan Stern init3: 1206f2835219SAlan Stern hub->quiescing = 0; 1207f2835219SAlan Stern 1208f2835219SAlan Stern status = usb_submit_urb(hub->urb, GFP_NOIO); 1209f2835219SAlan Stern if (status < 0) 1210f2835219SAlan Stern dev_err(hub->intfdev, "activate --> %d\n", status); 1211f2835219SAlan Stern if (hub->has_indicators && blinkenlights) 1212f2835219SAlan Stern schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD); 1213f2835219SAlan Stern 1214f2835219SAlan Stern /* Scan all ports that need attention */ 1215f2835219SAlan Stern kick_khubd(hub); 12168e4ceb38SAlan Stern 12178e4ceb38SAlan Stern /* Allow autosuspend if it was suppressed */ 12188e4ceb38SAlan Stern if (type <= HUB_INIT3) 12198e4ceb38SAlan Stern usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); 12205e6effaeSAlan Stern } 12215e6effaeSAlan Stern 12228520f380SAlan Stern /* Implement the continuations for the delays above */ 12238520f380SAlan Stern static void hub_init_func2(struct work_struct *ws) 12248520f380SAlan Stern { 12258520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12268520f380SAlan Stern 12278520f380SAlan Stern hub_activate(hub, HUB_INIT2); 12288520f380SAlan Stern } 12298520f380SAlan Stern 12308520f380SAlan Stern static void hub_init_func3(struct work_struct *ws) 12318520f380SAlan Stern { 12328520f380SAlan Stern struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); 12338520f380SAlan Stern 12348520f380SAlan Stern hub_activate(hub, HUB_INIT3); 12358520f380SAlan Stern } 12368520f380SAlan Stern 12374330354fSAlan Stern enum hub_quiescing_type { 12384330354fSAlan Stern HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND 12394330354fSAlan Stern }; 12404330354fSAlan Stern 12414330354fSAlan Stern static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) 12424330354fSAlan Stern { 12434330354fSAlan Stern struct usb_device *hdev = hub->hdev; 12444330354fSAlan Stern int i; 12454330354fSAlan Stern 12468520f380SAlan Stern cancel_delayed_work_sync(&hub->init_work); 12478520f380SAlan Stern 12484330354fSAlan Stern /* khubd 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 12594330354fSAlan Stern /* Stop khubd 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 12673eb14915SAlan Stern /* caller has locked the hub device */ 12683eb14915SAlan Stern static int hub_pre_reset(struct usb_interface *intf) 12693eb14915SAlan Stern { 12703eb14915SAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12713eb14915SAlan Stern 12724330354fSAlan Stern hub_quiesce(hub, HUB_PRE_RESET); 1273f07600cfSAlan Stern return 0; 12747d069b7dSAlan Stern } 12757d069b7dSAlan Stern 12767d069b7dSAlan Stern /* caller has locked the hub device */ 1277f07600cfSAlan Stern static int hub_post_reset(struct usb_interface *intf) 12787d069b7dSAlan Stern { 12797de18d8bSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 12807de18d8bSAlan Stern 1281f2835219SAlan Stern hub_activate(hub, HUB_POST_RESET); 1282f07600cfSAlan Stern return 0; 12837d069b7dSAlan Stern } 12847d069b7dSAlan Stern 12851da177e4SLinus Torvalds static int hub_configure(struct usb_hub *hub, 12861da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint) 12871da177e4SLinus Torvalds { 1288b356b7c7SSarah Sharp struct usb_hcd *hcd; 12891da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 12901da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 12911da177e4SLinus Torvalds u16 hubstatus, hubchange; 129274ad9bd2SGreg Kroah-Hartman u16 wHubCharacteristics; 12931da177e4SLinus Torvalds unsigned int pipe; 1294fa2a9566SLan Tianyu int maxp, ret, i; 12957cbe5dcaSAlan Stern char *message = "out of memory"; 1296430ee58eSSebastian Andrzej Siewior unsigned unit_load; 1297430ee58eSSebastian Andrzej Siewior unsigned full_load; 12981da177e4SLinus Torvalds 1299d697cddaSAlan Stern hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); 13001da177e4SLinus Torvalds if (!hub->buffer) { 13011da177e4SLinus Torvalds ret = -ENOMEM; 13021da177e4SLinus Torvalds goto fail; 13031da177e4SLinus Torvalds } 13041da177e4SLinus Torvalds 13051da177e4SLinus Torvalds hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); 13061da177e4SLinus Torvalds if (!hub->status) { 13071da177e4SLinus Torvalds ret = -ENOMEM; 13081da177e4SLinus Torvalds goto fail; 13091da177e4SLinus Torvalds } 1310db90e7a1SAlan Stern mutex_init(&hub->status_mutex); 13111da177e4SLinus Torvalds 13121da177e4SLinus Torvalds hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); 13131da177e4SLinus Torvalds if (!hub->descriptor) { 13141da177e4SLinus Torvalds ret = -ENOMEM; 13151da177e4SLinus Torvalds goto fail; 13161da177e4SLinus Torvalds } 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds /* Request the entire hub descriptor. 13191da177e4SLinus Torvalds * hub->descriptor can handle USB_MAXCHILDREN ports, 13201da177e4SLinus Torvalds * but the hub can/will return fewer bytes here. 13211da177e4SLinus Torvalds */ 1322dbe79bbeSJohn Youn ret = get_hub_descriptor(hdev, hub->descriptor); 13231da177e4SLinus Torvalds if (ret < 0) { 13241da177e4SLinus Torvalds message = "can't read hub descriptor"; 13251da177e4SLinus Torvalds goto fail; 13261da177e4SLinus Torvalds } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) { 13271da177e4SLinus Torvalds message = "hub has too many ports!"; 13281da177e4SLinus Torvalds ret = -ENODEV; 13291da177e4SLinus Torvalds goto fail; 1330769d7368SDavid Linares } else if (hub->descriptor->bNbrPorts == 0) { 1331769d7368SDavid Linares message = "hub doesn't have any ports!"; 1332769d7368SDavid Linares ret = -ENODEV; 1333769d7368SDavid Linares goto fail; 13341da177e4SLinus Torvalds } 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds hdev->maxchild = hub->descriptor->bNbrPorts; 13371da177e4SLinus Torvalds dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild, 13381da177e4SLinus Torvalds (hdev->maxchild == 1) ? "" : "s"); 13391da177e4SLinus Torvalds 1340fa2a9566SLan Tianyu hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *), 1341336c5c31SLan Tianyu GFP_KERNEL); 1342ff823c79SLan Tianyu if (!hub->ports) { 13437cbe5dcaSAlan Stern ret = -ENOMEM; 13447cbe5dcaSAlan Stern goto fail; 13457cbe5dcaSAlan Stern } 13467cbe5dcaSAlan Stern 134774ad9bd2SGreg Kroah-Hartman wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 1348430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hdev)) { 1349430ee58eSSebastian Andrzej Siewior unit_load = 150; 1350430ee58eSSebastian Andrzej Siewior full_load = 900; 1351430ee58eSSebastian Andrzej Siewior } else { 1352430ee58eSSebastian Andrzej Siewior unit_load = 100; 1353430ee58eSSebastian Andrzej Siewior full_load = 500; 1354430ee58eSSebastian Andrzej Siewior } 13551da177e4SLinus Torvalds 1356dbe79bbeSJohn Youn /* FIXME for USB 3.0, skip for now */ 1357dbe79bbeSJohn Youn if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && 1358dbe79bbeSJohn Youn !(hub_is_superspeed(hdev))) { 13591da177e4SLinus Torvalds int i; 13601da177e4SLinus Torvalds char portstr[USB_MAXCHILDREN + 1]; 13611da177e4SLinus Torvalds 13621da177e4SLinus Torvalds for (i = 0; i < hdev->maxchild; i++) 1363dbe79bbeSJohn Youn portstr[i] = hub->descriptor->u.hs.DeviceRemovable 13641da177e4SLinus Torvalds [((i + 1) / 8)] & (1 << ((i + 1) % 8)) 13651da177e4SLinus Torvalds ? 'F' : 'R'; 13661da177e4SLinus Torvalds portstr[hdev->maxchild] = 0; 13671da177e4SLinus Torvalds dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); 13681da177e4SLinus Torvalds } else 13691da177e4SLinus Torvalds dev_dbg(hub_dev, "standalone hub\n"); 13701da177e4SLinus Torvalds 137174ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_LPSM) { 13727bf01185SAman Deep case HUB_CHAR_COMMON_LPSM: 13731da177e4SLinus Torvalds dev_dbg(hub_dev, "ganged power switching\n"); 13741da177e4SLinus Torvalds break; 13757bf01185SAman Deep case HUB_CHAR_INDV_PORT_LPSM: 13761da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port power switching\n"); 13771da177e4SLinus Torvalds break; 13787bf01185SAman Deep case HUB_CHAR_NO_LPSM: 13797bf01185SAman Deep case HUB_CHAR_LPSM: 13801da177e4SLinus Torvalds dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); 13811da177e4SLinus Torvalds break; 13821da177e4SLinus Torvalds } 13831da177e4SLinus Torvalds 138474ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_OCPM) { 13857bf01185SAman Deep case HUB_CHAR_COMMON_OCPM: 13861da177e4SLinus Torvalds dev_dbg(hub_dev, "global over-current protection\n"); 13871da177e4SLinus Torvalds break; 13887bf01185SAman Deep case HUB_CHAR_INDV_PORT_OCPM: 13891da177e4SLinus Torvalds dev_dbg(hub_dev, "individual port over-current protection\n"); 13901da177e4SLinus Torvalds break; 13917bf01185SAman Deep case HUB_CHAR_NO_OCPM: 13927bf01185SAman Deep case HUB_CHAR_OCPM: 13931da177e4SLinus Torvalds dev_dbg(hub_dev, "no over-current protection\n"); 13941da177e4SLinus Torvalds break; 13951da177e4SLinus Torvalds } 13961da177e4SLinus Torvalds 13971da177e4SLinus Torvalds spin_lock_init (&hub->tt.lock); 13981da177e4SLinus Torvalds INIT_LIST_HEAD (&hub->tt.clear_list); 1399cb88a1b8SAlan Stern INIT_WORK(&hub->tt.clear_work, hub_tt_work); 14001da177e4SLinus Torvalds switch (hdev->descriptor.bDeviceProtocol) { 14017bf01185SAman Deep case USB_HUB_PR_FS: 14021da177e4SLinus Torvalds break; 14037bf01185SAman Deep case USB_HUB_PR_HS_SINGLE_TT: 14041da177e4SLinus Torvalds dev_dbg(hub_dev, "Single TT\n"); 14051da177e4SLinus Torvalds hub->tt.hub = hdev; 14061da177e4SLinus Torvalds break; 14077bf01185SAman Deep case USB_HUB_PR_HS_MULTI_TT: 14081da177e4SLinus Torvalds ret = usb_set_interface(hdev, 0, 1); 14091da177e4SLinus Torvalds if (ret == 0) { 14101da177e4SLinus Torvalds dev_dbg(hub_dev, "TT per port\n"); 14111da177e4SLinus Torvalds hub->tt.multi = 1; 14121da177e4SLinus Torvalds } else 14131da177e4SLinus Torvalds dev_err(hub_dev, "Using single TT (err %d)\n", 14141da177e4SLinus Torvalds ret); 14151da177e4SLinus Torvalds hub->tt.hub = hdev; 14161da177e4SLinus Torvalds break; 14177bf01185SAman Deep case USB_HUB_PR_SS: 1418d2e9b4d6SSarah Sharp /* USB 3.0 hubs don't have a TT */ 1419d2e9b4d6SSarah Sharp break; 14201da177e4SLinus Torvalds default: 14211da177e4SLinus Torvalds dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", 14221da177e4SLinus Torvalds hdev->descriptor.bDeviceProtocol); 14231da177e4SLinus Torvalds break; 14241da177e4SLinus Torvalds } 14251da177e4SLinus Torvalds 1426e09711aeSdavid-b@pacbell.net /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ 142774ad9bd2SGreg Kroah-Hartman switch (wHubCharacteristics & HUB_CHAR_TTTT) { 1428e09711aeSdavid-b@pacbell.net case HUB_TTTT_8_BITS: 1429e09711aeSdavid-b@pacbell.net if (hdev->descriptor.bDeviceProtocol != 0) { 1430e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666; 1431e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1432e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1433e09711aeSdavid-b@pacbell.net 8, hub->tt.think_time); 1434e09711aeSdavid-b@pacbell.net } 14351da177e4SLinus Torvalds break; 1436e09711aeSdavid-b@pacbell.net case HUB_TTTT_16_BITS: 1437e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 2; 1438e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1439e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1440e09711aeSdavid-b@pacbell.net 16, hub->tt.think_time); 14411da177e4SLinus Torvalds break; 1442e09711aeSdavid-b@pacbell.net case HUB_TTTT_24_BITS: 1443e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 3; 1444e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1445e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1446e09711aeSdavid-b@pacbell.net 24, hub->tt.think_time); 14471da177e4SLinus Torvalds break; 1448e09711aeSdavid-b@pacbell.net case HUB_TTTT_32_BITS: 1449e09711aeSdavid-b@pacbell.net hub->tt.think_time = 666 * 4; 1450e09711aeSdavid-b@pacbell.net dev_dbg(hub_dev, "TT requires at most %d " 1451e09711aeSdavid-b@pacbell.net "FS bit times (%d ns)\n", 1452e09711aeSdavid-b@pacbell.net 32, hub->tt.think_time); 14531da177e4SLinus Torvalds break; 14541da177e4SLinus Torvalds } 14551da177e4SLinus Torvalds 14561da177e4SLinus Torvalds /* probe() zeroes hub->indicator[] */ 145774ad9bd2SGreg Kroah-Hartman if (wHubCharacteristics & HUB_CHAR_PORTIND) { 14581da177e4SLinus Torvalds hub->has_indicators = 1; 14591da177e4SLinus Torvalds dev_dbg(hub_dev, "Port indicators are supported\n"); 14601da177e4SLinus Torvalds } 14611da177e4SLinus Torvalds 14621da177e4SLinus Torvalds dev_dbg(hub_dev, "power on to power good time: %dms\n", 14631da177e4SLinus Torvalds hub->descriptor->bPwrOn2PwrGood * 2); 14641da177e4SLinus Torvalds 14651da177e4SLinus Torvalds /* power budgeting mostly matters with bus-powered hubs, 14661da177e4SLinus Torvalds * and battery-powered root hubs (may provide just 8 mA). 14671da177e4SLinus Torvalds */ 14681da177e4SLinus Torvalds ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); 146915b7336eSAlan Stern if (ret) { 14701da177e4SLinus Torvalds message = "can't get hub status"; 14711da177e4SLinus Torvalds goto fail; 14721da177e4SLinus Torvalds } 1473430ee58eSSebastian Andrzej Siewior hcd = bus_to_hcd(hdev->bus); 14747d35b929SAlan Stern if (hdev == hdev->bus->root_hub) { 1475430ee58eSSebastian Andrzej Siewior if (hcd->power_budget > 0) 1476430ee58eSSebastian Andrzej Siewior hdev->bus_mA = hcd->power_budget; 1477430ee58eSSebastian Andrzej Siewior else 1478430ee58eSSebastian Andrzej Siewior hdev->bus_mA = full_load * hdev->maxchild; 1479430ee58eSSebastian Andrzej Siewior if (hdev->bus_mA >= full_load) 1480430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 148155c52718SAlan Stern else { 148255c52718SAlan Stern hub->mA_per_port = hdev->bus_mA; 148355c52718SAlan Stern hub->limited_power = 1; 148455c52718SAlan Stern } 14857d35b929SAlan Stern } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 148655c52718SAlan Stern int remaining = hdev->bus_mA - 148755c52718SAlan Stern hub->descriptor->bHubContrCurrent; 14881da177e4SLinus Torvalds 1489430ee58eSSebastian Andrzej Siewior dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", 1490430ee58eSSebastian Andrzej Siewior hub->descriptor->bHubContrCurrent); 1491430ee58eSSebastian Andrzej Siewior hub->limited_power = 1; 1492430ee58eSSebastian Andrzej Siewior 1493430ee58eSSebastian Andrzej Siewior if (remaining < hdev->maxchild * unit_load) 149455c52718SAlan Stern dev_warn(hub_dev, 149555c52718SAlan Stern "insufficient power available " 149655c52718SAlan Stern "to use all downstream ports\n"); 1497430ee58eSSebastian Andrzej Siewior hub->mA_per_port = unit_load; /* 7.2.1 */ 1498430ee58eSSebastian Andrzej Siewior 149955c52718SAlan Stern } else { /* Self-powered external hub */ 150055c52718SAlan Stern /* FIXME: What about battery-powered external hubs that 150155c52718SAlan Stern * provide less current per port? */ 1502430ee58eSSebastian Andrzej Siewior hub->mA_per_port = full_load; 150355c52718SAlan Stern } 1504430ee58eSSebastian Andrzej Siewior if (hub->mA_per_port < full_load) 150555c52718SAlan Stern dev_dbg(hub_dev, "%umA bus power budget for each child\n", 150655c52718SAlan Stern hub->mA_per_port); 15071da177e4SLinus Torvalds 1508b356b7c7SSarah Sharp /* Update the HCD's internal representation of this hub before khubd 1509b356b7c7SSarah Sharp * starts getting port status changes for devices under the hub. 1510b356b7c7SSarah Sharp */ 1511b356b7c7SSarah Sharp if (hcd->driver->update_hub_device) { 1512b356b7c7SSarah Sharp ret = hcd->driver->update_hub_device(hcd, hdev, 1513b356b7c7SSarah Sharp &hub->tt, GFP_KERNEL); 1514b356b7c7SSarah Sharp if (ret < 0) { 1515b356b7c7SSarah Sharp message = "can't update HCD hub info"; 1516b356b7c7SSarah Sharp goto fail; 1517b356b7c7SSarah Sharp } 1518b356b7c7SSarah Sharp } 1519b356b7c7SSarah Sharp 15201da177e4SLinus Torvalds ret = hub_hub_status(hub, &hubstatus, &hubchange); 15211da177e4SLinus Torvalds if (ret < 0) { 15221da177e4SLinus Torvalds message = "can't get hub status"; 15231da177e4SLinus Torvalds goto fail; 15241da177e4SLinus Torvalds } 15251da177e4SLinus Torvalds 15261da177e4SLinus Torvalds /* local power status reports aren't always correct */ 15271da177e4SLinus Torvalds if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) 15281da177e4SLinus Torvalds dev_dbg(hub_dev, "local power source is %s\n", 15291da177e4SLinus Torvalds (hubstatus & HUB_STATUS_LOCAL_POWER) 15301da177e4SLinus Torvalds ? "lost (inactive)" : "good"); 15311da177e4SLinus Torvalds 153274ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) 15331da177e4SLinus Torvalds dev_dbg(hub_dev, "%sover-current condition exists\n", 15341da177e4SLinus Torvalds (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); 15351da177e4SLinus Torvalds 153688fafff9Sinaky@linux.intel.com /* set up the interrupt endpoint 153788fafff9Sinaky@linux.intel.com * We use the EP's maxpacket size instead of (PORTS+1+7)/8 153888fafff9Sinaky@linux.intel.com * bytes as USB2.0[11.12.3] says because some hubs are known 153988fafff9Sinaky@linux.intel.com * to send more data (and thus cause overflow). For root hubs, 154088fafff9Sinaky@linux.intel.com * maxpktsize is defined in hcd.c's fake endpoint descriptors 154188fafff9Sinaky@linux.intel.com * to be big enough for at least USB_MAXCHILDREN ports. */ 15421da177e4SLinus Torvalds pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); 15431da177e4SLinus Torvalds maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); 15441da177e4SLinus Torvalds 15451da177e4SLinus Torvalds if (maxp > sizeof(*hub->buffer)) 15461da177e4SLinus Torvalds maxp = sizeof(*hub->buffer); 15471da177e4SLinus Torvalds 15481da177e4SLinus Torvalds hub->urb = usb_alloc_urb(0, GFP_KERNEL); 15491da177e4SLinus Torvalds if (!hub->urb) { 15501da177e4SLinus Torvalds ret = -ENOMEM; 15511da177e4SLinus Torvalds goto fail; 15521da177e4SLinus Torvalds } 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, 15551da177e4SLinus Torvalds hub, endpoint->bInterval); 15561da177e4SLinus Torvalds 15571da177e4SLinus Torvalds /* maybe cycle the hub leds */ 15581da177e4SLinus Torvalds if (hub->has_indicators && blinkenlights) 15591da177e4SLinus Torvalds hub->indicator[0] = INDICATOR_CYCLE; 15601da177e4SLinus Torvalds 1561e58547ebSKrzysztof Mazur for (i = 0; i < hdev->maxchild; i++) { 1562e58547ebSKrzysztof Mazur ret = usb_hub_create_port_device(hub, i + 1); 1563e58547ebSKrzysztof Mazur if (ret < 0) { 1564fa2a9566SLan Tianyu dev_err(hub->intfdev, 1565fa2a9566SLan Tianyu "couldn't create port%d device.\n", i + 1); 1566e58547ebSKrzysztof Mazur hdev->maxchild = i; 1567e58547ebSKrzysztof Mazur goto fail_keep_maxchild; 1568e58547ebSKrzysztof Mazur } 1569e58547ebSKrzysztof Mazur } 1570fa2a9566SLan Tianyu 1571d2123fd9SLan Tianyu usb_hub_adjust_deviceremovable(hdev, hub->descriptor); 1572d2123fd9SLan Tianyu 1573f2835219SAlan Stern hub_activate(hub, HUB_INIT); 15741da177e4SLinus Torvalds return 0; 15751da177e4SLinus Torvalds 15761da177e4SLinus Torvalds fail: 1577d0308d4bSKrzysztof Mazur hdev->maxchild = 0; 1578e58547ebSKrzysztof Mazur fail_keep_maxchild: 15791da177e4SLinus Torvalds dev_err (hub_dev, "config failed, %s (err %d)\n", 15801da177e4SLinus Torvalds message, ret); 15811da177e4SLinus Torvalds /* hub_disconnect() frees urb and descriptor */ 15821da177e4SLinus Torvalds return ret; 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds 1585e8054854SAlan Stern static void hub_release(struct kref *kref) 1586e8054854SAlan Stern { 1587e8054854SAlan Stern struct usb_hub *hub = container_of(kref, struct usb_hub, kref); 1588e8054854SAlan Stern 1589e8054854SAlan Stern usb_put_intf(to_usb_interface(hub->intfdev)); 1590e8054854SAlan Stern kfree(hub); 1591e8054854SAlan Stern } 1592e8054854SAlan Stern 15931da177e4SLinus Torvalds static unsigned highspeed_hubs; 15941da177e4SLinus Torvalds 15951da177e4SLinus Torvalds static void hub_disconnect(struct usb_interface *intf) 15961da177e4SLinus Torvalds { 15971da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 1598fa286188SGreg Kroah-Hartman struct usb_device *hdev = interface_to_usbdev(intf); 1599543d7784SAlan Stern int port1; 1600fa2a9566SLan Tianyu 1601e8054854SAlan Stern /* Take the hub off the event list and don't let it be added again */ 1602e8054854SAlan Stern spin_lock_irq(&hub_event_lock); 16038e4ceb38SAlan Stern if (!list_empty(&hub->event_list)) { 1604e8054854SAlan Stern list_del_init(&hub->event_list); 16058e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 16068e4ceb38SAlan Stern } 1607e8054854SAlan Stern hub->disconnected = 1; 1608e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 16091da177e4SLinus Torvalds 16107de18d8bSAlan Stern /* Disconnect all children and quiesce the hub */ 16117de18d8bSAlan Stern hub->error = 0; 16124330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 16137de18d8bSAlan Stern 1614543d7784SAlan Stern /* Avoid races with recursively_mark_NOTATTACHED() */ 1615543d7784SAlan Stern spin_lock_irq(&device_state_lock); 1616543d7784SAlan Stern port1 = hdev->maxchild; 1617543d7784SAlan Stern hdev->maxchild = 0; 16188b28c752SAlan Stern usb_set_intfdata(intf, NULL); 1619543d7784SAlan Stern spin_unlock_irq(&device_state_lock); 16201f2235b8SAlexander Shishkin 1621543d7784SAlan Stern for (; port1 > 0; --port1) 1622543d7784SAlan Stern usb_hub_remove_port_device(hub, port1); 16231da177e4SLinus Torvalds 1624e8054854SAlan Stern if (hub->hdev->speed == USB_SPEED_HIGH) 16251da177e4SLinus Torvalds highspeed_hubs--; 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds usb_free_urb(hub->urb); 1628fa2a9566SLan Tianyu kfree(hub->ports); 16291da177e4SLinus Torvalds kfree(hub->descriptor); 16301da177e4SLinus Torvalds kfree(hub->status); 1631d697cddaSAlan Stern kfree(hub->buffer); 16321da177e4SLinus Torvalds 1633971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, false); 1634e8054854SAlan Stern kref_put(&hub->kref, hub_release); 16351da177e4SLinus Torvalds } 16361da177e4SLinus Torvalds 16371da177e4SLinus Torvalds static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) 16381da177e4SLinus Torvalds { 16391da177e4SLinus Torvalds struct usb_host_interface *desc; 16401da177e4SLinus Torvalds struct usb_endpoint_descriptor *endpoint; 16411da177e4SLinus Torvalds struct usb_device *hdev; 16421da177e4SLinus Torvalds struct usb_hub *hub; 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds desc = intf->cur_altsetting; 16451da177e4SLinus Torvalds hdev = interface_to_usbdev(intf); 16461da177e4SLinus Torvalds 1647596d789aSMing Lei /* 1648596d789aSMing Lei * Set default autosuspend delay as 0 to speedup bus suspend, 1649596d789aSMing Lei * based on the below considerations: 1650596d789aSMing Lei * 1651596d789aSMing Lei * - Unlike other drivers, the hub driver does not rely on the 1652596d789aSMing Lei * autosuspend delay to provide enough time to handle a wakeup 1653596d789aSMing Lei * event, and the submitted status URB is just to check future 1654596d789aSMing Lei * change on hub downstream ports, so it is safe to do it. 1655596d789aSMing Lei * 1656596d789aSMing Lei * - The patch might cause one or more auto supend/resume for 1657596d789aSMing Lei * below very rare devices when they are plugged into hub 1658596d789aSMing Lei * first time: 1659596d789aSMing Lei * 1660596d789aSMing Lei * devices having trouble initializing, and disconnect 1661596d789aSMing Lei * themselves from the bus and then reconnect a second 1662596d789aSMing Lei * or so later 1663596d789aSMing Lei * 1664596d789aSMing Lei * devices just for downloading firmware, and disconnects 1665596d789aSMing Lei * themselves after completing it 1666596d789aSMing Lei * 1667596d789aSMing Lei * For these quite rare devices, their drivers may change the 1668596d789aSMing Lei * autosuspend delay of their parent hub in the probe() to one 1669596d789aSMing Lei * appropriate value to avoid the subtle problem if someone 1670596d789aSMing Lei * does care it. 1671596d789aSMing Lei * 1672596d789aSMing Lei * - The patch may cause one or more auto suspend/resume on 1673596d789aSMing Lei * hub during running 'lsusb', but it is probably too 1674596d789aSMing Lei * infrequent to worry about. 1675596d789aSMing Lei * 1676596d789aSMing Lei * - Change autosuspend delay of hub can avoid unnecessary auto 1677596d789aSMing Lei * suspend timer for hub, also may decrease power consumption 1678596d789aSMing Lei * of USB bus. 1679596d789aSMing Lei */ 1680596d789aSMing Lei pm_runtime_set_autosuspend_delay(&hdev->dev, 0); 1681596d789aSMing Lei 16822839f5bcSSarah Sharp /* Hubs have proper suspend/resume support. */ 1683088f7fecSAlan Stern usb_enable_autosuspend(hdev); 1684088f7fecSAlan Stern 168538f3ad5eSFelipe Balbi if (hdev->level == MAX_TOPO_LEVEL) { 1686b9cef6c3SWu Fengguang dev_err(&intf->dev, 1687b9cef6c3SWu Fengguang "Unsupported bus topology: hub nested too deep\n"); 168838f3ad5eSFelipe Balbi return -E2BIG; 168938f3ad5eSFelipe Balbi } 169038f3ad5eSFelipe Balbi 169189ccbdc9SDavid Brownell #ifdef CONFIG_USB_OTG_BLACKLIST_HUB 169289ccbdc9SDavid Brownell if (hdev->parent) { 169389ccbdc9SDavid Brownell dev_warn(&intf->dev, "ignoring external hub\n"); 169489ccbdc9SDavid Brownell return -ENODEV; 169589ccbdc9SDavid Brownell } 169689ccbdc9SDavid Brownell #endif 169789ccbdc9SDavid Brownell 16981da177e4SLinus Torvalds /* Some hubs have a subclass of 1, which AFAICT according to the */ 16991da177e4SLinus Torvalds /* specs is not defined, but it works */ 17001da177e4SLinus Torvalds if ((desc->desc.bInterfaceSubClass != 0) && 17011da177e4SLinus Torvalds (desc->desc.bInterfaceSubClass != 1)) { 17021da177e4SLinus Torvalds descriptor_error: 17031da177e4SLinus Torvalds dev_err (&intf->dev, "bad descriptor, ignoring hub\n"); 17041da177e4SLinus Torvalds return -EIO; 17051da177e4SLinus Torvalds } 17061da177e4SLinus Torvalds 17071da177e4SLinus Torvalds /* Multiple endpoints? What kind of mutant ninja-hub is this? */ 17081da177e4SLinus Torvalds if (desc->desc.bNumEndpoints != 1) 17091da177e4SLinus Torvalds goto descriptor_error; 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds endpoint = &desc->endpoint[0].desc; 17121da177e4SLinus Torvalds 1713fbf81c29SLuiz Fernando N. Capitulino /* If it's not an interrupt in endpoint, we'd better punt! */ 1714fbf81c29SLuiz Fernando N. Capitulino if (!usb_endpoint_is_int_in(endpoint)) 17151da177e4SLinus Torvalds goto descriptor_error; 17161da177e4SLinus Torvalds 17171da177e4SLinus Torvalds /* We found a hub */ 17181da177e4SLinus Torvalds dev_info (&intf->dev, "USB hub found\n"); 17191da177e4SLinus Torvalds 17200a1ef3b5SAlan Stern hub = kzalloc(sizeof(*hub), GFP_KERNEL); 17211da177e4SLinus Torvalds if (!hub) { 17221da177e4SLinus Torvalds dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n"); 17231da177e4SLinus Torvalds return -ENOMEM; 17241da177e4SLinus Torvalds } 17251da177e4SLinus Torvalds 1726e8054854SAlan Stern kref_init(&hub->kref); 17271da177e4SLinus Torvalds INIT_LIST_HEAD(&hub->event_list); 17281da177e4SLinus Torvalds hub->intfdev = &intf->dev; 17291da177e4SLinus Torvalds hub->hdev = hdev; 1730c4028958SDavid Howells INIT_DELAYED_WORK(&hub->leds, led_work); 17318520f380SAlan Stern INIT_DELAYED_WORK(&hub->init_work, NULL); 1732e8054854SAlan Stern usb_get_intf(intf); 17331da177e4SLinus Torvalds 17341da177e4SLinus Torvalds usb_set_intfdata (intf, hub); 173540f122f3SAlan Stern intf->needs_remote_wakeup = 1; 1736971fcd49SLan Tianyu pm_suspend_ignore_children(&intf->dev, true); 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds if (hdev->speed == USB_SPEED_HIGH) 17391da177e4SLinus Torvalds highspeed_hubs++; 17401da177e4SLinus Torvalds 1741e6f30deaSMing Lei if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) 1742e6f30deaSMing Lei hub->quirk_check_port_auto_suspend = 1; 1743e6f30deaSMing Lei 17441da177e4SLinus Torvalds if (hub_configure(hub, endpoint) >= 0) 17451da177e4SLinus Torvalds return 0; 17461da177e4SLinus Torvalds 17471da177e4SLinus Torvalds hub_disconnect (intf); 17481da177e4SLinus Torvalds return -ENODEV; 17491da177e4SLinus Torvalds } 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds static int 17521da177e4SLinus Torvalds hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) 17531da177e4SLinus Torvalds { 17541da177e4SLinus Torvalds struct usb_device *hdev = interface_to_usbdev (intf); 1755ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 17561da177e4SLinus Torvalds 17571da177e4SLinus Torvalds /* assert ifno == 0 (part of hub spec) */ 17581da177e4SLinus Torvalds switch (code) { 17591da177e4SLinus Torvalds case USBDEVFS_HUB_PORTINFO: { 17601da177e4SLinus Torvalds struct usbdevfs_hub_portinfo *info = user_data; 17611da177e4SLinus Torvalds int i; 17621da177e4SLinus Torvalds 17631da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 17641da177e4SLinus Torvalds if (hdev->devnum <= 0) 17651da177e4SLinus Torvalds info->nports = 0; 17661da177e4SLinus Torvalds else { 17671da177e4SLinus Torvalds info->nports = hdev->maxchild; 17681da177e4SLinus Torvalds for (i = 0; i < info->nports; i++) { 1769ff823c79SLan Tianyu if (hub->ports[i]->child == NULL) 17701da177e4SLinus Torvalds info->port[i] = 0; 17711da177e4SLinus Torvalds else 17721da177e4SLinus Torvalds info->port[i] = 1773ff823c79SLan Tianyu hub->ports[i]->child->devnum; 17741da177e4SLinus Torvalds } 17751da177e4SLinus Torvalds } 17761da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 17771da177e4SLinus Torvalds 17781da177e4SLinus Torvalds return info->nports + 1; 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 17811da177e4SLinus Torvalds default: 17821da177e4SLinus Torvalds return -ENOSYS; 17831da177e4SLinus Torvalds } 17841da177e4SLinus Torvalds } 17851da177e4SLinus Torvalds 17867cbe5dcaSAlan Stern /* 17877cbe5dcaSAlan Stern * Allow user programs to claim ports on a hub. When a device is attached 17887cbe5dcaSAlan Stern * to one of these "claimed" ports, the program will "own" the device. 17897cbe5dcaSAlan Stern */ 17907cbe5dcaSAlan Stern static int find_port_owner(struct usb_device *hdev, unsigned port1, 1791336c5c31SLan Tianyu struct dev_state ***ppowner) 17927cbe5dcaSAlan Stern { 179341341261SMathias Nyman struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 179441341261SMathias Nyman 17957cbe5dcaSAlan Stern if (hdev->state == USB_STATE_NOTATTACHED) 17967cbe5dcaSAlan Stern return -ENODEV; 17977cbe5dcaSAlan Stern if (port1 == 0 || port1 > hdev->maxchild) 17987cbe5dcaSAlan Stern return -EINVAL; 17997cbe5dcaSAlan Stern 180041341261SMathias Nyman /* Devices not managed by the hub driver 18017cbe5dcaSAlan Stern * will always have maxchild equal to 0. 18027cbe5dcaSAlan Stern */ 180341341261SMathias Nyman *ppowner = &(hub->ports[port1 - 1]->port_owner); 18047cbe5dcaSAlan Stern return 0; 18057cbe5dcaSAlan Stern } 18067cbe5dcaSAlan Stern 18077cbe5dcaSAlan Stern /* In the following three functions, the caller must hold hdev's lock */ 1808336c5c31SLan Tianyu int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, 1809336c5c31SLan Tianyu struct dev_state *owner) 18107cbe5dcaSAlan Stern { 18117cbe5dcaSAlan Stern int rc; 1812336c5c31SLan Tianyu struct dev_state **powner; 18137cbe5dcaSAlan Stern 18147cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18157cbe5dcaSAlan Stern if (rc) 18167cbe5dcaSAlan Stern return rc; 18177cbe5dcaSAlan Stern if (*powner) 18187cbe5dcaSAlan Stern return -EBUSY; 18197cbe5dcaSAlan Stern *powner = owner; 18207cbe5dcaSAlan Stern return rc; 18217cbe5dcaSAlan Stern } 18227cbe5dcaSAlan Stern 1823336c5c31SLan Tianyu int usb_hub_release_port(struct usb_device *hdev, unsigned port1, 1824336c5c31SLan Tianyu struct dev_state *owner) 18257cbe5dcaSAlan Stern { 18267cbe5dcaSAlan Stern int rc; 1827336c5c31SLan Tianyu struct dev_state **powner; 18287cbe5dcaSAlan Stern 18297cbe5dcaSAlan Stern rc = find_port_owner(hdev, port1, &powner); 18307cbe5dcaSAlan Stern if (rc) 18317cbe5dcaSAlan Stern return rc; 18327cbe5dcaSAlan Stern if (*powner != owner) 18337cbe5dcaSAlan Stern return -ENOENT; 18347cbe5dcaSAlan Stern *powner = NULL; 18357cbe5dcaSAlan Stern return rc; 18367cbe5dcaSAlan Stern } 18377cbe5dcaSAlan Stern 1838336c5c31SLan Tianyu void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner) 18397cbe5dcaSAlan Stern { 1840ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 18417cbe5dcaSAlan Stern int n; 18427cbe5dcaSAlan Stern 1843fa2a9566SLan Tianyu for (n = 0; n < hdev->maxchild; n++) { 1844fa2a9566SLan Tianyu if (hub->ports[n]->port_owner == owner) 1845fa2a9566SLan Tianyu hub->ports[n]->port_owner = NULL; 18467cbe5dcaSAlan Stern } 1847fa2a9566SLan Tianyu 18487cbe5dcaSAlan Stern } 18497cbe5dcaSAlan Stern 18507cbe5dcaSAlan Stern /* The caller must hold udev's lock */ 18517cbe5dcaSAlan Stern bool usb_device_is_owned(struct usb_device *udev) 18527cbe5dcaSAlan Stern { 18537cbe5dcaSAlan Stern struct usb_hub *hub; 18547cbe5dcaSAlan Stern 18557cbe5dcaSAlan Stern if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) 18567cbe5dcaSAlan Stern return false; 1857ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 1858fa2a9566SLan Tianyu return !!hub->ports[udev->portnum - 1]->port_owner; 18597cbe5dcaSAlan Stern } 18607cbe5dcaSAlan Stern 18611da177e4SLinus Torvalds static void recursively_mark_NOTATTACHED(struct usb_device *udev) 18621da177e4SLinus Torvalds { 1863ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 18641da177e4SLinus Torvalds int i; 18651da177e4SLinus Torvalds 18661da177e4SLinus Torvalds for (i = 0; i < udev->maxchild; ++i) { 1867ff823c79SLan Tianyu if (hub->ports[i]->child) 1868ff823c79SLan Tianyu recursively_mark_NOTATTACHED(hub->ports[i]->child); 18691da177e4SLinus Torvalds } 18709bbdf1e0SAlan Stern if (udev->state == USB_STATE_SUSPENDED) 187115123006SSarah Sharp udev->active_duration -= jiffies; 18721da177e4SLinus Torvalds udev->state = USB_STATE_NOTATTACHED; 18731da177e4SLinus Torvalds } 18741da177e4SLinus Torvalds 18751da177e4SLinus Torvalds /** 18761da177e4SLinus Torvalds * usb_set_device_state - change a device's current state (usbcore, hcds) 18771da177e4SLinus Torvalds * @udev: pointer to device whose state should be changed 18781da177e4SLinus Torvalds * @new_state: new state value to be stored 18791da177e4SLinus Torvalds * 18801da177e4SLinus Torvalds * udev->state is _not_ fully protected by the device lock. Although 18811da177e4SLinus Torvalds * most transitions are made only while holding the lock, the state can 18821da177e4SLinus Torvalds * can change to USB_STATE_NOTATTACHED at almost any time. This 18831da177e4SLinus Torvalds * is so that devices can be marked as disconnected as soon as possible, 18841da177e4SLinus Torvalds * without having to wait for any semaphores to be released. As a result, 18851da177e4SLinus Torvalds * all changes to any device's state must be protected by the 18861da177e4SLinus Torvalds * device_state_lock spinlock. 18871da177e4SLinus Torvalds * 18881da177e4SLinus Torvalds * Once a device has been added to the device tree, all changes to its state 18891da177e4SLinus Torvalds * should be made using this routine. The state should _not_ be set directly. 18901da177e4SLinus Torvalds * 18911da177e4SLinus Torvalds * If udev->state is already USB_STATE_NOTATTACHED then no change is made. 18921da177e4SLinus Torvalds * Otherwise udev->state is set to new_state, and if new_state is 18931da177e4SLinus Torvalds * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set 18941da177e4SLinus Torvalds * to USB_STATE_NOTATTACHED. 18951da177e4SLinus Torvalds */ 18961da177e4SLinus Torvalds void usb_set_device_state(struct usb_device *udev, 18971da177e4SLinus Torvalds enum usb_device_state new_state) 18981da177e4SLinus Torvalds { 18991da177e4SLinus Torvalds unsigned long flags; 19004681b171SRafael J. Wysocki int wakeup = -1; 19011da177e4SLinus Torvalds 19021da177e4SLinus Torvalds spin_lock_irqsave(&device_state_lock, flags); 19031da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED) 19041da177e4SLinus Torvalds ; /* do nothing */ 1905b94dc6b5SDavid Brownell else if (new_state != USB_STATE_NOTATTACHED) { 1906fb669cc0SDavid Brownell 1907fb669cc0SDavid Brownell /* root hub wakeup capabilities are managed out-of-band 1908fb669cc0SDavid Brownell * and may involve silicon errata ... ignore them here. 1909fb669cc0SDavid Brownell */ 1910fb669cc0SDavid Brownell if (udev->parent) { 1911645daaabSAlan Stern if (udev->state == USB_STATE_SUSPENDED 1912645daaabSAlan Stern || new_state == USB_STATE_SUSPENDED) 1913645daaabSAlan Stern ; /* No change to wakeup settings */ 1914645daaabSAlan Stern else if (new_state == USB_STATE_CONFIGURED) 19154681b171SRafael J. Wysocki wakeup = udev->actconfig->desc.bmAttributes 19164681b171SRafael J. Wysocki & USB_CONFIG_ATT_WAKEUP; 1917645daaabSAlan Stern else 19184681b171SRafael J. Wysocki wakeup = 0; 1919fb669cc0SDavid Brownell } 192015123006SSarah Sharp if (udev->state == USB_STATE_SUSPENDED && 192115123006SSarah Sharp new_state != USB_STATE_SUSPENDED) 192215123006SSarah Sharp udev->active_duration -= jiffies; 192315123006SSarah Sharp else if (new_state == USB_STATE_SUSPENDED && 192415123006SSarah Sharp udev->state != USB_STATE_SUSPENDED) 192515123006SSarah Sharp udev->active_duration += jiffies; 1926645daaabSAlan Stern udev->state = new_state; 1927b94dc6b5SDavid Brownell } else 19281da177e4SLinus Torvalds recursively_mark_NOTATTACHED(udev); 19291da177e4SLinus Torvalds spin_unlock_irqrestore(&device_state_lock, flags); 19304681b171SRafael J. Wysocki if (wakeup >= 0) 19314681b171SRafael J. Wysocki device_set_wakeup_capable(&udev->dev, wakeup); 19321da177e4SLinus Torvalds } 19336da9c990SDavid Vrabel EXPORT_SYMBOL_GPL(usb_set_device_state); 19341da177e4SLinus Torvalds 19358af548dcSInaky Perez-Gonzalez /* 19363b29b68bSAlan Stern * Choose a device number. 19373b29b68bSAlan Stern * 19383b29b68bSAlan Stern * Device numbers are used as filenames in usbfs. On USB-1.1 and 19393b29b68bSAlan Stern * USB-2.0 buses they are also used as device addresses, however on 19403b29b68bSAlan Stern * USB-3.0 buses the address is assigned by the controller hardware 19413b29b68bSAlan Stern * and it usually is not the same as the device number. 19423b29b68bSAlan Stern * 19438af548dcSInaky Perez-Gonzalez * WUSB devices are simple: they have no hubs behind, so the mapping 19448af548dcSInaky Perez-Gonzalez * device <-> virtual port number becomes 1:1. Why? to simplify the 19458af548dcSInaky Perez-Gonzalez * life of the device connection logic in 19468af548dcSInaky Perez-Gonzalez * drivers/usb/wusbcore/devconnect.c. When we do the initial secret 19478af548dcSInaky Perez-Gonzalez * handshake we need to assign a temporary address in the unauthorized 19488af548dcSInaky Perez-Gonzalez * space. For simplicity we use the first virtual port number found to 19498af548dcSInaky Perez-Gonzalez * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] 19508af548dcSInaky Perez-Gonzalez * and that becomes it's address [X < 128] or its unauthorized address 19518af548dcSInaky Perez-Gonzalez * [X | 0x80]. 19528af548dcSInaky Perez-Gonzalez * 19538af548dcSInaky Perez-Gonzalez * We add 1 as an offset to the one-based USB-stack port number 19548af548dcSInaky Perez-Gonzalez * (zero-based wusb virtual port index) for two reasons: (a) dev addr 19558af548dcSInaky Perez-Gonzalez * 0 is reserved by USB for default address; (b) Linux's USB stack 19568af548dcSInaky Perez-Gonzalez * uses always #1 for the root hub of the controller. So USB stack's 19578af548dcSInaky Perez-Gonzalez * port #1, which is wusb virtual-port #0 has address #2. 1958c6515272SSarah Sharp * 1959c6515272SSarah Sharp * Devices connected under xHCI are not as simple. The host controller 1960c6515272SSarah Sharp * supports virtualization, so the hardware assigns device addresses and 1961c6515272SSarah Sharp * the HCD must setup data structures before issuing a set address 1962c6515272SSarah Sharp * command to the hardware. 19638af548dcSInaky Perez-Gonzalez */ 19643b29b68bSAlan Stern static void choose_devnum(struct usb_device *udev) 19651da177e4SLinus Torvalds { 19661da177e4SLinus Torvalds int devnum; 19671da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 19681da177e4SLinus Torvalds 19691da177e4SLinus Torvalds /* If khubd ever becomes multithreaded, this will need a lock */ 19708af548dcSInaky Perez-Gonzalez if (udev->wusb) { 19718af548dcSInaky Perez-Gonzalez devnum = udev->portnum + 1; 19728af548dcSInaky Perez-Gonzalez BUG_ON(test_bit(devnum, bus->devmap.devicemap)); 19738af548dcSInaky Perez-Gonzalez } else { 19748af548dcSInaky Perez-Gonzalez /* Try to allocate the next devnum beginning at 19758af548dcSInaky Perez-Gonzalez * bus->devnum_next. */ 19761da177e4SLinus Torvalds devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 19771da177e4SLinus Torvalds bus->devnum_next); 19781da177e4SLinus Torvalds if (devnum >= 128) 19798af548dcSInaky Perez-Gonzalez devnum = find_next_zero_bit(bus->devmap.devicemap, 19808af548dcSInaky Perez-Gonzalez 128, 1); 19811da177e4SLinus Torvalds bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); 19828af548dcSInaky Perez-Gonzalez } 19831da177e4SLinus Torvalds if (devnum < 128) { 19841da177e4SLinus Torvalds set_bit(devnum, bus->devmap.devicemap); 19851da177e4SLinus Torvalds udev->devnum = devnum; 19861da177e4SLinus Torvalds } 19871da177e4SLinus Torvalds } 19881da177e4SLinus Torvalds 19893b29b68bSAlan Stern static void release_devnum(struct usb_device *udev) 19901da177e4SLinus Torvalds { 19911da177e4SLinus Torvalds if (udev->devnum > 0) { 19921da177e4SLinus Torvalds clear_bit(udev->devnum, udev->bus->devmap.devicemap); 19931da177e4SLinus Torvalds udev->devnum = -1; 19941da177e4SLinus Torvalds } 19951da177e4SLinus Torvalds } 19961da177e4SLinus Torvalds 19973b29b68bSAlan Stern static void update_devnum(struct usb_device *udev, int devnum) 19984953d141SDavid Vrabel { 19994953d141SDavid Vrabel /* The address for a WUSB device is managed by wusbcore. */ 20004953d141SDavid Vrabel if (!udev->wusb) 20014953d141SDavid Vrabel udev->devnum = devnum; 20024953d141SDavid Vrabel } 20034953d141SDavid Vrabel 2004f7410cedSHerbert Xu static void hub_free_dev(struct usb_device *udev) 2005f7410cedSHerbert Xu { 2006f7410cedSHerbert Xu struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2007f7410cedSHerbert Xu 2008f7410cedSHerbert Xu /* Root hubs aren't real devices, so don't free HCD resources */ 2009f7410cedSHerbert Xu if (hcd->driver->free_dev && udev->parent) 2010f7410cedSHerbert Xu hcd->driver->free_dev(hcd, udev); 2011f7410cedSHerbert Xu } 2012f7410cedSHerbert Xu 20131da177e4SLinus Torvalds /** 20141da177e4SLinus Torvalds * usb_disconnect - disconnect a device (usbcore-internal) 20151da177e4SLinus Torvalds * @pdev: pointer to device being disconnected 20161da177e4SLinus Torvalds * Context: !in_interrupt () 20171da177e4SLinus Torvalds * 20181da177e4SLinus Torvalds * Something got disconnected. Get rid of it and all of its children. 20191da177e4SLinus Torvalds * 20201da177e4SLinus Torvalds * If *pdev is a normal device then the parent hub must already be locked. 2021db8f2aa3SBjorn Helgaas * If *pdev is a root hub then the caller must hold the usb_bus_list_lock, 2022db8f2aa3SBjorn Helgaas * which protects the set of root hubs as well as the list of buses. 20231da177e4SLinus Torvalds * 20241da177e4SLinus Torvalds * Only hub drivers (including virtual root hub drivers for host 20251da177e4SLinus Torvalds * controllers) should ever call this. 20261da177e4SLinus Torvalds * 20271da177e4SLinus Torvalds * This call is synchronous, and may not be used in an interrupt context. 20281da177e4SLinus Torvalds */ 20291da177e4SLinus Torvalds void usb_disconnect(struct usb_device **pdev) 20301da177e4SLinus Torvalds { 20311da177e4SLinus Torvalds struct usb_device *udev = *pdev; 2032ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev); 20331da177e4SLinus Torvalds int i; 20341da177e4SLinus Torvalds 20351da177e4SLinus Torvalds /* mark the device as inactive, so any further urb submissions for 20361da177e4SLinus Torvalds * this device (and any of its children) will fail immediately. 203725985edcSLucas De Marchi * this quiesces everything except pending urbs. 20381da177e4SLinus Torvalds */ 20391da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 20403b29b68bSAlan Stern dev_info(&udev->dev, "USB disconnect, device number %d\n", 20413b29b68bSAlan Stern udev->devnum); 20421da177e4SLinus Torvalds 20439ad3d6ccSAlan Stern usb_lock_device(udev); 20449ad3d6ccSAlan Stern 20451da177e4SLinus Torvalds /* Free up all the children before we remove this device */ 20468816230eSHuajun Li for (i = 0; i < udev->maxchild; i++) { 2047ff823c79SLan Tianyu if (hub->ports[i]->child) 2048ff823c79SLan Tianyu usb_disconnect(&hub->ports[i]->child); 20491da177e4SLinus Torvalds } 20501da177e4SLinus Torvalds 20511da177e4SLinus Torvalds /* deallocate hcd/hardware state ... nuking all pending urbs and 20521da177e4SLinus Torvalds * cleaning up all state associated with the current configuration 20531da177e4SLinus Torvalds * so that the hardware is now fully quiesced. 20541da177e4SLinus Torvalds */ 2055782da727SAlan Stern dev_dbg (&udev->dev, "unregistering device\n"); 20561da177e4SLinus Torvalds usb_disable_device(udev, 0); 2057cde217a5SAlan Stern usb_hcd_synchronize_unlinks(udev); 20581da177e4SLinus Torvalds 2059fde26380SLan Tianyu if (udev->parent) { 2060ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2061ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2062fde26380SLan Tianyu 2063fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2064fde26380SLan Tianyu sysfs_remove_link(&port_dev->dev.kobj, "device"); 2065971fcd49SLan Tianyu 2066ad493e5eSLan Tianyu if (!port_dev->did_runtime_put) 2067971fcd49SLan Tianyu pm_runtime_put(&port_dev->dev); 2068ad493e5eSLan Tianyu else 2069ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 2070fde26380SLan Tianyu } 2071fde26380SLan Tianyu 20723b23dd6fSAlan Stern usb_remove_ep_devs(&udev->ep0); 2073782da727SAlan Stern usb_unlock_device(udev); 20743099e75aSGreg Kroah-Hartman 2075782da727SAlan Stern /* Unregister the device. The device driver is responsible 20763b23dd6fSAlan Stern * for de-configuring the device and invoking the remove-device 20773b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2078782da727SAlan Stern */ 2079782da727SAlan Stern device_del(&udev->dev); 2080782da727SAlan Stern 2081782da727SAlan Stern /* Free the device number and delete the parent's children[] 20821da177e4SLinus Torvalds * (or root_hub) pointer. 20831da177e4SLinus Torvalds */ 20843b29b68bSAlan Stern release_devnum(udev); 20851da177e4SLinus Torvalds 20861da177e4SLinus Torvalds /* Avoid races with recursively_mark_NOTATTACHED() */ 20871da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 20881da177e4SLinus Torvalds *pdev = NULL; 20891da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 20901da177e4SLinus Torvalds 2091f7410cedSHerbert Xu hub_free_dev(udev); 2092f7410cedSHerbert Xu 2093782da727SAlan Stern put_device(&udev->dev); 20941da177e4SLinus Torvalds } 20951da177e4SLinus Torvalds 2096f2a383e4SGreg Kroah-Hartman #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES 20971da177e4SLinus Torvalds static void show_string(struct usb_device *udev, char *id, char *string) 20981da177e4SLinus Torvalds { 20991da177e4SLinus Torvalds if (!string) 21001da177e4SLinus Torvalds return; 2101f2ec522eSJoe Perches dev_info(&udev->dev, "%s: %s\n", id, string); 21021da177e4SLinus Torvalds } 21031da177e4SLinus Torvalds 2104f2a383e4SGreg Kroah-Hartman static void announce_device(struct usb_device *udev) 2105f2a383e4SGreg Kroah-Hartman { 2106f2a383e4SGreg Kroah-Hartman dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n", 2107f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idVendor), 2108f2a383e4SGreg Kroah-Hartman le16_to_cpu(udev->descriptor.idProduct)); 2109b9cef6c3SWu Fengguang dev_info(&udev->dev, 2110b9cef6c3SWu Fengguang "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", 2111f2a383e4SGreg Kroah-Hartman udev->descriptor.iManufacturer, 2112f2a383e4SGreg Kroah-Hartman udev->descriptor.iProduct, 2113f2a383e4SGreg Kroah-Hartman udev->descriptor.iSerialNumber); 2114f2a383e4SGreg Kroah-Hartman show_string(udev, "Product", udev->product); 2115f2a383e4SGreg Kroah-Hartman show_string(udev, "Manufacturer", udev->manufacturer); 2116f2a383e4SGreg Kroah-Hartman show_string(udev, "SerialNumber", udev->serial); 2117f2a383e4SGreg Kroah-Hartman } 21181da177e4SLinus Torvalds #else 2119f2a383e4SGreg Kroah-Hartman static inline void announce_device(struct usb_device *udev) { } 21201da177e4SLinus Torvalds #endif 21211da177e4SLinus Torvalds 21221da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21231da177e4SLinus Torvalds #include "otg_whitelist.h" 21241da177e4SLinus Torvalds #endif 21251da177e4SLinus Torvalds 21263ede760fSOliver Neukum /** 21278d8558d1SAlan Stern * usb_enumerate_device_otg - FIXME (usbcore-internal) 21283ede760fSOliver Neukum * @udev: newly addressed device (in ADDRESS state) 21293ede760fSOliver Neukum * 21308d8558d1SAlan Stern * Finish enumeration for On-The-Go devices 2131626f090cSYacine Belkadi * 2132626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 21333ede760fSOliver Neukum */ 21348d8558d1SAlan Stern static int usb_enumerate_device_otg(struct usb_device *udev) 21351da177e4SLinus Torvalds { 2136d9d16e8aSInaky Perez-Gonzalez int err = 0; 21371da177e4SLinus Torvalds 21381da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 21391da177e4SLinus Torvalds /* 21401da177e4SLinus Torvalds * OTG-aware devices on OTG-capable root hubs may be able to use SRP, 21411da177e4SLinus Torvalds * to wake us after we've powered off VBUS; and HNP, switching roles 21421da177e4SLinus Torvalds * "host" to "peripheral". The OTG descriptor helps figure this out. 21431da177e4SLinus Torvalds */ 21441da177e4SLinus Torvalds if (!udev->bus->is_b_host 21451da177e4SLinus Torvalds && udev->config 21461da177e4SLinus Torvalds && udev->parent == udev->bus->root_hub) { 21472eb5052eSFelipe Balbi struct usb_otg_descriptor *desc = NULL; 21481da177e4SLinus Torvalds struct usb_bus *bus = udev->bus; 21491da177e4SLinus Torvalds 21501da177e4SLinus Torvalds /* descriptor may appear anywhere in config */ 21511da177e4SLinus Torvalds if (__usb_get_extra_descriptor (udev->rawdescriptors[0], 21521da177e4SLinus Torvalds le16_to_cpu(udev->config[0].desc.wTotalLength), 21531da177e4SLinus Torvalds USB_DT_OTG, (void **) &desc) == 0) { 21541da177e4SLinus Torvalds if (desc->bmAttributes & USB_OTG_HNP) { 215512c3da34SAlan Stern unsigned port1 = udev->portnum; 21561da177e4SLinus Torvalds 21571da177e4SLinus Torvalds dev_info(&udev->dev, 21581da177e4SLinus Torvalds "Dual-Role OTG device on %sHNP port\n", 21591da177e4SLinus Torvalds (port1 == bus->otg_port) 21601da177e4SLinus Torvalds ? "" : "non-"); 21611da177e4SLinus Torvalds 21621da177e4SLinus Torvalds /* enable HNP before suspend, it's simpler */ 21631da177e4SLinus Torvalds if (port1 == bus->otg_port) 21641da177e4SLinus Torvalds bus->b_hnp_enable = 1; 21651da177e4SLinus Torvalds err = usb_control_msg(udev, 21661da177e4SLinus Torvalds usb_sndctrlpipe(udev, 0), 21671da177e4SLinus Torvalds USB_REQ_SET_FEATURE, 0, 21681da177e4SLinus Torvalds bus->b_hnp_enable 21691da177e4SLinus Torvalds ? USB_DEVICE_B_HNP_ENABLE 21701da177e4SLinus Torvalds : USB_DEVICE_A_ALT_HNP_SUPPORT, 21711da177e4SLinus Torvalds 0, NULL, 0, USB_CTRL_SET_TIMEOUT); 21721da177e4SLinus Torvalds if (err < 0) { 21731da177e4SLinus Torvalds /* OTG MESSAGE: report errors here, 21741da177e4SLinus Torvalds * customize to match your product. 21751da177e4SLinus Torvalds */ 21761da177e4SLinus Torvalds dev_info(&udev->dev, 2177b9cef6c3SWu Fengguang "can't set HNP mode: %d\n", 21781da177e4SLinus Torvalds err); 21791da177e4SLinus Torvalds bus->b_hnp_enable = 0; 21801da177e4SLinus Torvalds } 21811da177e4SLinus Torvalds } 21821da177e4SLinus Torvalds } 21831da177e4SLinus Torvalds } 21841da177e4SLinus Torvalds 21851da177e4SLinus Torvalds if (!is_targeted(udev)) { 21861da177e4SLinus Torvalds 21871da177e4SLinus Torvalds /* Maybe it can talk to us, though we can't talk to it. 21881da177e4SLinus Torvalds * (Includes HNP test device.) 21891da177e4SLinus Torvalds */ 21901da177e4SLinus Torvalds if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { 2191634a84f8SDavid Brownell err = usb_port_suspend(udev, PMSG_SUSPEND); 21921da177e4SLinus Torvalds if (err < 0) 21931da177e4SLinus Torvalds dev_dbg(&udev->dev, "HNP fail, %d\n", err); 21941da177e4SLinus Torvalds } 2195ffcdc18dSVikram Pandita err = -ENOTSUPP; 21961da177e4SLinus Torvalds goto fail; 21971da177e4SLinus Torvalds } 2198d9d16e8aSInaky Perez-Gonzalez fail: 21991da177e4SLinus Torvalds #endif 2200d9d16e8aSInaky Perez-Gonzalez return err; 2201d9d16e8aSInaky Perez-Gonzalez } 22021da177e4SLinus Torvalds 2203d9d16e8aSInaky Perez-Gonzalez 2204d9d16e8aSInaky Perez-Gonzalez /** 22058d8558d1SAlan Stern * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) 2206d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2207d9d16e8aSInaky Perez-Gonzalez * 2208d9d16e8aSInaky Perez-Gonzalez * This is only called by usb_new_device() and usb_authorize_device() 2209d9d16e8aSInaky Perez-Gonzalez * and FIXME -- all comments that apply to them apply here wrt to 2210d9d16e8aSInaky Perez-Gonzalez * environment. 2211d9d16e8aSInaky Perez-Gonzalez * 2212d9d16e8aSInaky Perez-Gonzalez * If the device is WUSB and not authorized, we don't attempt to read 2213d9d16e8aSInaky Perez-Gonzalez * the string descriptors, as they will be errored out by the device 2214d9d16e8aSInaky Perez-Gonzalez * until it has been authorized. 2215626f090cSYacine Belkadi * 2216626f090cSYacine Belkadi * Return: 0 if successful. A negative error code otherwise. 2217d9d16e8aSInaky Perez-Gonzalez */ 22188d8558d1SAlan Stern static int usb_enumerate_device(struct usb_device *udev) 2219d9d16e8aSInaky Perez-Gonzalez { 2220d9d16e8aSInaky Perez-Gonzalez int err; 2221d9d16e8aSInaky Perez-Gonzalez 2222d9d16e8aSInaky Perez-Gonzalez if (udev->config == NULL) { 2223d9d16e8aSInaky Perez-Gonzalez err = usb_get_configuration(udev); 2224d9d16e8aSInaky Perez-Gonzalez if (err < 0) { 2225e9e88fb7SAlan Stern if (err != -ENODEV) 2226d9d16e8aSInaky Perez-Gonzalez dev_err(&udev->dev, "can't read configurations, error %d\n", 2227d9d16e8aSInaky Perez-Gonzalez err); 222880da2e0dSLaurent Pinchart return err; 2229d9d16e8aSInaky Perez-Gonzalez } 2230d9d16e8aSInaky Perez-Gonzalez } 223183e83ecbSThomas Pugliese 2232d9d16e8aSInaky Perez-Gonzalez /* read the standard strings and cache them if present */ 2233d9d16e8aSInaky Perez-Gonzalez udev->product = usb_cache_string(udev, udev->descriptor.iProduct); 2234d9d16e8aSInaky Perez-Gonzalez udev->manufacturer = usb_cache_string(udev, 2235d9d16e8aSInaky Perez-Gonzalez udev->descriptor.iManufacturer); 2236d9d16e8aSInaky Perez-Gonzalez udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); 223783e83ecbSThomas Pugliese 22388d8558d1SAlan Stern err = usb_enumerate_device_otg(udev); 223980da2e0dSLaurent Pinchart if (err < 0) 2240d9d16e8aSInaky Perez-Gonzalez return err; 224180da2e0dSLaurent Pinchart 224280da2e0dSLaurent Pinchart usb_detect_interface_quirks(udev); 224380da2e0dSLaurent Pinchart 224480da2e0dSLaurent Pinchart return 0; 2245d9d16e8aSInaky Perez-Gonzalez } 2246d9d16e8aSInaky Perez-Gonzalez 2247d35e70d5SMatthew Garrett static void set_usb_port_removable(struct usb_device *udev) 2248d35e70d5SMatthew Garrett { 2249d35e70d5SMatthew Garrett struct usb_device *hdev = udev->parent; 2250d35e70d5SMatthew Garrett struct usb_hub *hub; 2251d35e70d5SMatthew Garrett u8 port = udev->portnum; 2252d35e70d5SMatthew Garrett u16 wHubCharacteristics; 2253d35e70d5SMatthew Garrett bool removable = true; 2254d35e70d5SMatthew Garrett 2255d35e70d5SMatthew Garrett if (!hdev) 2256d35e70d5SMatthew Garrett return; 2257d35e70d5SMatthew Garrett 2258ad493e5eSLan Tianyu hub = usb_hub_to_struct_hub(udev->parent); 2259d35e70d5SMatthew Garrett 2260d35e70d5SMatthew Garrett wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); 2261d35e70d5SMatthew Garrett 2262d35e70d5SMatthew Garrett if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) 2263d35e70d5SMatthew Garrett return; 2264d35e70d5SMatthew Garrett 2265d35e70d5SMatthew Garrett if (hub_is_superspeed(hdev)) { 2266ca3c1539SLan Tianyu if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) 2267ca3c1539SLan Tianyu & (1 << port)) 2268d35e70d5SMatthew Garrett removable = false; 2269d35e70d5SMatthew Garrett } else { 2270d35e70d5SMatthew Garrett if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) 2271d35e70d5SMatthew Garrett removable = false; 2272d35e70d5SMatthew Garrett } 2273d35e70d5SMatthew Garrett 2274d35e70d5SMatthew Garrett if (removable) 2275d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_REMOVABLE; 2276d35e70d5SMatthew Garrett else 2277d35e70d5SMatthew Garrett udev->removable = USB_DEVICE_FIXED; 2278d35e70d5SMatthew Garrett } 2279d9d16e8aSInaky Perez-Gonzalez 2280d9d16e8aSInaky Perez-Gonzalez /** 2281d9d16e8aSInaky Perez-Gonzalez * usb_new_device - perform initial device setup (usbcore-internal) 2282d9d16e8aSInaky Perez-Gonzalez * @udev: newly addressed device (in ADDRESS state) 2283d9d16e8aSInaky Perez-Gonzalez * 22848d8558d1SAlan Stern * This is called with devices which have been detected but not fully 22858d8558d1SAlan Stern * enumerated. The device descriptor is available, but not descriptors 2286d9d16e8aSInaky Perez-Gonzalez * for any device configuration. The caller must have locked either 2287d9d16e8aSInaky Perez-Gonzalez * the parent hub (if udev is a normal device) or else the 2288d9d16e8aSInaky Perez-Gonzalez * usb_bus_list_lock (if udev is a root hub). The parent's pointer to 2289d9d16e8aSInaky Perez-Gonzalez * udev has already been installed, but udev is not yet visible through 2290d9d16e8aSInaky Perez-Gonzalez * sysfs or other filesystem code. 2291d9d16e8aSInaky Perez-Gonzalez * 2292d9d16e8aSInaky Perez-Gonzalez * This call is synchronous, and may not be used in an interrupt context. 2293d9d16e8aSInaky Perez-Gonzalez * 2294d9d16e8aSInaky Perez-Gonzalez * Only the hub driver or root-hub registrar should ever call this. 2295626f090cSYacine Belkadi * 2296626f090cSYacine Belkadi * Return: Whether the device is configured properly or not. Zero if the 2297626f090cSYacine Belkadi * interface was registered with the driver core; else a negative errno 2298626f090cSYacine Belkadi * value. 2299626f090cSYacine Belkadi * 2300d9d16e8aSInaky Perez-Gonzalez */ 2301d9d16e8aSInaky Perez-Gonzalez int usb_new_device(struct usb_device *udev) 2302d9d16e8aSInaky Perez-Gonzalez { 2303d9d16e8aSInaky Perez-Gonzalez int err; 2304d9d16e8aSInaky Perez-Gonzalez 230516985408SDan Streetman if (udev->parent) { 230616985408SDan Streetman /* Initialize non-root-hub device wakeup to disabled; 230716985408SDan Streetman * device (un)configuration controls wakeup capable 230816985408SDan Streetman * sysfs power/wakeup controls wakeup enabled/disabled 230916985408SDan Streetman */ 231016985408SDan Streetman device_init_wakeup(&udev->dev, 0); 231116985408SDan Streetman } 231216985408SDan Streetman 23139bbdf1e0SAlan Stern /* Tell the runtime-PM framework the device is active */ 23149bbdf1e0SAlan Stern pm_runtime_set_active(&udev->dev); 2315c08512c7SAlan Stern pm_runtime_get_noresume(&udev->dev); 2316fcc4a01eSAlan Stern pm_runtime_use_autosuspend(&udev->dev); 23179bbdf1e0SAlan Stern pm_runtime_enable(&udev->dev); 23189bbdf1e0SAlan Stern 2319c08512c7SAlan Stern /* By default, forbid autosuspend for all devices. It will be 2320c08512c7SAlan Stern * allowed for hubs during binding. 2321c08512c7SAlan Stern */ 2322c08512c7SAlan Stern usb_disable_autosuspend(udev); 2323c08512c7SAlan Stern 23248d8558d1SAlan Stern err = usb_enumerate_device(udev); /* Read descriptors */ 2325d9d16e8aSInaky Perez-Gonzalez if (err < 0) 2326d9d16e8aSInaky Perez-Gonzalez goto fail; 2327c6515272SSarah Sharp dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", 2328c6515272SSarah Sharp udev->devnum, udev->bus->busnum, 2329c6515272SSarah Sharp (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23309f8b17e6SKay Sievers /* export the usbdev device-node for libusb */ 23319f8b17e6SKay Sievers udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, 23329f8b17e6SKay Sievers (((udev->bus->busnum-1) * 128) + (udev->devnum-1))); 23339f8b17e6SKay Sievers 23346cd13201SAlan Stern /* Tell the world! */ 23356cd13201SAlan Stern announce_device(udev); 2336195af2ccSAlan Stern 2337b04b3156STheodore Ts'o if (udev->serial) 2338b04b3156STheodore Ts'o add_device_randomness(udev->serial, strlen(udev->serial)); 2339b04b3156STheodore Ts'o if (udev->product) 2340b04b3156STheodore Ts'o add_device_randomness(udev->product, strlen(udev->product)); 2341b04b3156STheodore Ts'o if (udev->manufacturer) 2342b04b3156STheodore Ts'o add_device_randomness(udev->manufacturer, 2343b04b3156STheodore Ts'o strlen(udev->manufacturer)); 2344b04b3156STheodore Ts'o 2345927bc916SRafael J. Wysocki device_enable_async_suspend(&udev->dev); 2346d35e70d5SMatthew Garrett 2347d35e70d5SMatthew Garrett /* 2348d35e70d5SMatthew Garrett * check whether the hub marks this port as non-removable. Do it 2349d35e70d5SMatthew Garrett * now so that platform-specific data can override it in 2350d35e70d5SMatthew Garrett * device_add() 2351d35e70d5SMatthew Garrett */ 2352d35e70d5SMatthew Garrett if (udev->parent) 2353d35e70d5SMatthew Garrett set_usb_port_removable(udev); 2354d35e70d5SMatthew Garrett 2355782da727SAlan Stern /* Register the device. The device driver is responsible 23563b23dd6fSAlan Stern * for configuring the device and invoking the add-device 23573b23dd6fSAlan Stern * notifier chain (used by usbfs and possibly others). 2358782da727SAlan Stern */ 23591da177e4SLinus Torvalds err = device_add(&udev->dev); 23601da177e4SLinus Torvalds if (err) { 23611da177e4SLinus Torvalds dev_err(&udev->dev, "can't device_add, error %d\n", err); 23621da177e4SLinus Torvalds goto fail; 23631da177e4SLinus Torvalds } 23649ad3d6ccSAlan Stern 2365fde26380SLan Tianyu /* Create link files between child device and usb port device. */ 2366fde26380SLan Tianyu if (udev->parent) { 2367ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2368ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2369fde26380SLan Tianyu 2370fde26380SLan Tianyu err = sysfs_create_link(&udev->dev.kobj, 2371fde26380SLan Tianyu &port_dev->dev.kobj, "port"); 2372fde26380SLan Tianyu if (err) 2373fde26380SLan Tianyu goto fail; 2374fde26380SLan Tianyu 2375fde26380SLan Tianyu err = sysfs_create_link(&port_dev->dev.kobj, 2376fde26380SLan Tianyu &udev->dev.kobj, "device"); 2377fde26380SLan Tianyu if (err) { 2378fde26380SLan Tianyu sysfs_remove_link(&udev->dev.kobj, "port"); 2379fde26380SLan Tianyu goto fail; 2380fde26380SLan Tianyu } 2381971fcd49SLan Tianyu 2382971fcd49SLan Tianyu pm_runtime_get_sync(&port_dev->dev); 2383fde26380SLan Tianyu } 2384fde26380SLan Tianyu 23853b23dd6fSAlan Stern (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); 2386c08512c7SAlan Stern usb_mark_last_busy(udev); 2387c08512c7SAlan Stern pm_runtime_put_sync_autosuspend(&udev->dev); 2388c066475eSGreg Kroah-Hartman return err; 23891da177e4SLinus Torvalds 23901da177e4SLinus Torvalds fail: 23911da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_NOTATTACHED); 23929bbdf1e0SAlan Stern pm_runtime_disable(&udev->dev); 23939bbdf1e0SAlan Stern pm_runtime_set_suspended(&udev->dev); 2394d9d16e8aSInaky Perez-Gonzalez return err; 23951da177e4SLinus Torvalds } 23961da177e4SLinus Torvalds 239793993a0aSInaky Perez-Gonzalez 239893993a0aSInaky Perez-Gonzalez /** 2399fd39c86bSRandy Dunlap * usb_deauthorize_device - deauthorize a device (usbcore-internal) 2400fd39c86bSRandy Dunlap * @usb_dev: USB device 2401fd39c86bSRandy Dunlap * 2402fd39c86bSRandy Dunlap * Move the USB device to a very basic state where interfaces are disabled 2403fd39c86bSRandy Dunlap * and the device is in fact unconfigured and unusable. 240493993a0aSInaky Perez-Gonzalez * 240593993a0aSInaky Perez-Gonzalez * We share a lock (that we have) with device_del(), so we need to 240693993a0aSInaky Perez-Gonzalez * defer its call. 2407626f090cSYacine Belkadi * 2408626f090cSYacine Belkadi * Return: 0. 240993993a0aSInaky Perez-Gonzalez */ 241093993a0aSInaky Perez-Gonzalez int usb_deauthorize_device(struct usb_device *usb_dev) 241193993a0aSInaky Perez-Gonzalez { 241293993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 241393993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 0) 241493993a0aSInaky Perez-Gonzalez goto out_unauthorized; 2415da307123SAlan Stern 241693993a0aSInaky Perez-Gonzalez usb_dev->authorized = 0; 241793993a0aSInaky Perez-Gonzalez usb_set_configuration(usb_dev, -1); 2418da307123SAlan Stern 241993993a0aSInaky Perez-Gonzalez out_unauthorized: 242093993a0aSInaky Perez-Gonzalez usb_unlock_device(usb_dev); 242193993a0aSInaky Perez-Gonzalez return 0; 242293993a0aSInaky Perez-Gonzalez } 242393993a0aSInaky Perez-Gonzalez 242493993a0aSInaky Perez-Gonzalez 242593993a0aSInaky Perez-Gonzalez int usb_authorize_device(struct usb_device *usb_dev) 242693993a0aSInaky Perez-Gonzalez { 242793993a0aSInaky Perez-Gonzalez int result = 0, c; 2428da307123SAlan Stern 242993993a0aSInaky Perez-Gonzalez usb_lock_device(usb_dev); 243093993a0aSInaky Perez-Gonzalez if (usb_dev->authorized == 1) 243193993a0aSInaky Perez-Gonzalez goto out_authorized; 2432da307123SAlan Stern 243393993a0aSInaky Perez-Gonzalez result = usb_autoresume_device(usb_dev); 243493993a0aSInaky Perez-Gonzalez if (result < 0) { 243593993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 243693993a0aSInaky Perez-Gonzalez "can't autoresume for authorization: %d\n", result); 243793993a0aSInaky Perez-Gonzalez goto error_autoresume; 243893993a0aSInaky Perez-Gonzalez } 243993993a0aSInaky Perez-Gonzalez result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); 244093993a0aSInaky Perez-Gonzalez if (result < 0) { 244193993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, "can't re-read device descriptor for " 244293993a0aSInaky Perez-Gonzalez "authorization: %d\n", result); 244393993a0aSInaky Perez-Gonzalez goto error_device_descriptor; 244493993a0aSInaky Perez-Gonzalez } 2445da307123SAlan Stern 244693993a0aSInaky Perez-Gonzalez usb_dev->authorized = 1; 244793993a0aSInaky Perez-Gonzalez /* Choose and set the configuration. This registers the interfaces 244893993a0aSInaky Perez-Gonzalez * with the driver core and lets interface drivers bind to them. 244993993a0aSInaky Perez-Gonzalez */ 2450b5ea060fSGreg Kroah-Hartman c = usb_choose_configuration(usb_dev); 245193993a0aSInaky Perez-Gonzalez if (c >= 0) { 245293993a0aSInaky Perez-Gonzalez result = usb_set_configuration(usb_dev, c); 245393993a0aSInaky Perez-Gonzalez if (result) { 245493993a0aSInaky Perez-Gonzalez dev_err(&usb_dev->dev, 245593993a0aSInaky Perez-Gonzalez "can't set config #%d, error %d\n", c, result); 245693993a0aSInaky Perez-Gonzalez /* This need not be fatal. The user can try to 245793993a0aSInaky Perez-Gonzalez * set other configurations. */ 245893993a0aSInaky Perez-Gonzalez } 245993993a0aSInaky Perez-Gonzalez } 246093993a0aSInaky Perez-Gonzalez dev_info(&usb_dev->dev, "authorized to connect\n"); 2461da307123SAlan Stern 246293993a0aSInaky Perez-Gonzalez error_device_descriptor: 2463da307123SAlan Stern usb_autosuspend_device(usb_dev); 246493993a0aSInaky Perez-Gonzalez error_autoresume: 246593993a0aSInaky Perez-Gonzalez out_authorized: 2466781b2137SMatthias Beyer usb_unlock_device(usb_dev); /* complements locktree */ 246793993a0aSInaky Perez-Gonzalez return result; 246893993a0aSInaky Perez-Gonzalez } 246993993a0aSInaky Perez-Gonzalez 247093993a0aSInaky Perez-Gonzalez 24710165de09SInaky Perez-Gonzalez /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ 24720165de09SInaky Perez-Gonzalez static unsigned hub_is_wusb(struct usb_hub *hub) 24730165de09SInaky Perez-Gonzalez { 24740165de09SInaky Perez-Gonzalez struct usb_hcd *hcd; 24750165de09SInaky Perez-Gonzalez if (hub->hdev->parent != NULL) /* not a root hub? */ 24760165de09SInaky Perez-Gonzalez return 0; 24770165de09SInaky Perez-Gonzalez hcd = container_of(hub->hdev->bus, struct usb_hcd, self); 24780165de09SInaky Perez-Gonzalez return hcd->wireless; 24790165de09SInaky Perez-Gonzalez } 24800165de09SInaky Perez-Gonzalez 24810165de09SInaky Perez-Gonzalez 24821da177e4SLinus Torvalds #define PORT_RESET_TRIES 5 24831da177e4SLinus Torvalds #define SET_ADDRESS_TRIES 2 24841da177e4SLinus Torvalds #define GET_DESCRIPTOR_TRIES 2 24851da177e4SLinus Torvalds #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1)) 248690ab5ee9SRusty Russell #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first) 24871da177e4SLinus Torvalds 24881da177e4SLinus Torvalds #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ 24891da177e4SLinus Torvalds #define HUB_SHORT_RESET_TIME 10 249075d7cf72SAndiry Xu #define HUB_BH_RESET_TIME 50 24911da177e4SLinus Torvalds #define HUB_LONG_RESET_TIME 200 249277c7f072SSarah Sharp #define HUB_RESET_TIMEOUT 800 24931da177e4SLinus Torvalds 249448fc7dbdSDan Williams /* 249548fc7dbdSDan Williams * "New scheme" enumeration causes an extra state transition to be 249648fc7dbdSDan Williams * exposed to an xhci host and causes USB3 devices to receive control 249748fc7dbdSDan Williams * commands in the default state. This has been seen to cause 249848fc7dbdSDan Williams * enumeration failures, so disable this enumeration scheme for USB3 249948fc7dbdSDan Williams * devices. 250048fc7dbdSDan Williams */ 250148fc7dbdSDan Williams static bool use_new_scheme(struct usb_device *udev, int retry) 250248fc7dbdSDan Williams { 250348fc7dbdSDan Williams if (udev->speed == USB_SPEED_SUPER) 250448fc7dbdSDan Williams return false; 250548fc7dbdSDan Williams 250648fc7dbdSDan Williams return USE_NEW_SCHEME(retry); 250748fc7dbdSDan Williams } 250848fc7dbdSDan Williams 250910d674a8SSarah Sharp static int hub_port_reset(struct usb_hub *hub, int port1, 251010d674a8SSarah Sharp struct usb_device *udev, unsigned int delay, bool warm); 251110d674a8SSarah Sharp 2512025d4430SRahul Bedarkar /* Is a USB 3.0 port in the Inactive or Compliance Mode state? 25138bea2bd3SStanislaw Ledwon * Port worm reset is required to recover 25148bea2bd3SStanislaw Ledwon */ 25158bea2bd3SStanislaw Ledwon static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus) 251610d674a8SSarah Sharp { 251710d674a8SSarah Sharp return hub_is_superspeed(hub->hdev) && 25188bea2bd3SStanislaw Ledwon (((portstatus & USB_PORT_STAT_LINK_STATE) == 25198bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_SS_INACTIVE) || 25208bea2bd3SStanislaw Ledwon ((portstatus & USB_PORT_STAT_LINK_STATE) == 25218bea2bd3SStanislaw Ledwon USB_SS_PORT_LS_COMP_MOD)) ; 252210d674a8SSarah Sharp } 252310d674a8SSarah Sharp 25241da177e4SLinus Torvalds static int hub_port_wait_reset(struct usb_hub *hub, int port1, 252575d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 25261da177e4SLinus Torvalds { 25271da177e4SLinus Torvalds int delay_time, ret; 25281da177e4SLinus Torvalds u16 portstatus; 25291da177e4SLinus Torvalds u16 portchange; 25301da177e4SLinus Torvalds 25311da177e4SLinus Torvalds for (delay_time = 0; 25321da177e4SLinus Torvalds delay_time < HUB_RESET_TIMEOUT; 25331da177e4SLinus Torvalds delay_time += delay) { 25341da177e4SLinus Torvalds /* wait to give the device a chance to reset */ 25351da177e4SLinus Torvalds msleep(delay); 25361da177e4SLinus Torvalds 25371da177e4SLinus Torvalds /* read and decode port status */ 25381da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 25391da177e4SLinus Torvalds if (ret < 0) 25401da177e4SLinus Torvalds return ret; 25411da177e4SLinus Torvalds 25424f43447eSSarah Sharp /* The port state is unknown until the reset completes. */ 2543470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_RESET)) 2544470f0be8SSarah Sharp break; 2545470f0be8SSarah Sharp 2546470f0be8SSarah Sharp /* switch to the long delay after two short delay failures */ 2547470f0be8SSarah Sharp if (delay_time >= 2 * HUB_SHORT_RESET_TIME) 2548470f0be8SSarah Sharp delay = HUB_LONG_RESET_TIME; 2549470f0be8SSarah Sharp 2550470f0be8SSarah Sharp dev_dbg (hub->intfdev, 2551470f0be8SSarah Sharp "port %d not %sreset yet, waiting %dms\n", 2552470f0be8SSarah Sharp port1, warm ? "warm " : "", delay); 2553470f0be8SSarah Sharp } 2554470f0be8SSarah Sharp 25554f43447eSSarah Sharp if ((portstatus & USB_PORT_STAT_RESET)) 2556470f0be8SSarah Sharp return -EBUSY; 25574f43447eSSarah Sharp 2558a24a6078SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2559a24a6078SSarah Sharp return -ENOTCONN; 256010d674a8SSarah Sharp 25611da177e4SLinus Torvalds /* Device went away? */ 25621da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_CONNECTION)) 25631da177e4SLinus Torvalds return -ENOTCONN; 25641da177e4SLinus Torvalds 2565a24a6078SSarah Sharp /* bomb out completely if the connection bounced. A USB 3.0 2566a24a6078SSarah Sharp * connection may bounce if multiple warm resets were issued, 2567a24a6078SSarah Sharp * but the device may have successfully re-connected. Ignore it. 2568a24a6078SSarah Sharp */ 2569a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev) && 2570a24a6078SSarah Sharp (portchange & USB_PORT_STAT_C_CONNECTION)) 2571dd4dd19eSAlan Stern return -ENOTCONN; 25721da177e4SLinus Torvalds 2573470f0be8SSarah Sharp if (!(portstatus & USB_PORT_STAT_ENABLE)) 2574470f0be8SSarah Sharp return -EBUSY; 2575470f0be8SSarah Sharp 25762d4fa940SSarah Sharp if (!udev) 25772d4fa940SSarah Sharp return 0; 25782d4fa940SSarah Sharp 25790165de09SInaky Perez-Gonzalez if (hub_is_wusb(hub)) 2580551cdbbeSGreg Kroah-Hartman udev->speed = USB_SPEED_WIRELESS; 2581131dec34SSarah Sharp else if (hub_is_superspeed(hub->hdev)) 2582809cd1cbSSarah Sharp udev->speed = USB_SPEED_SUPER; 25830165de09SInaky Perez-Gonzalez else if (portstatus & USB_PORT_STAT_HIGH_SPEED) 25841da177e4SLinus Torvalds udev->speed = USB_SPEED_HIGH; 25851da177e4SLinus Torvalds else if (portstatus & USB_PORT_STAT_LOW_SPEED) 25861da177e4SLinus Torvalds udev->speed = USB_SPEED_LOW; 25871da177e4SLinus Torvalds else 25881da177e4SLinus Torvalds udev->speed = USB_SPEED_FULL; 25891da177e4SLinus Torvalds return 0; 25901da177e4SLinus Torvalds } 25911da177e4SLinus Torvalds 259275d7cf72SAndiry Xu static void hub_port_finish_reset(struct usb_hub *hub, int port1, 2593a24a6078SSarah Sharp struct usb_device *udev, int *status) 25941da177e4SLinus Torvalds { 259575d7cf72SAndiry Xu switch (*status) { 25961da177e4SLinus Torvalds case 0: 2597b789696aSDavid Brownell /* TRSTRCY = 10 ms; plus some extra */ 2598b789696aSDavid Brownell msleep(10 + 40); 25992d4fa940SSarah Sharp if (udev) { 2600a24a6078SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2601a24a6078SSarah Sharp 26023b29b68bSAlan Stern update_devnum(udev, 0); 2603a24a6078SSarah Sharp /* The xHC may think the device is already reset, 2604a24a6078SSarah Sharp * so ignore the status. 26058b8132bcSSarah Sharp */ 26068b8132bcSSarah Sharp if (hcd->driver->reset_device) 26078b8132bcSSarah Sharp hcd->driver->reset_device(hcd, udev); 260875d7cf72SAndiry Xu } 26091da177e4SLinus Torvalds /* FALL THROUGH */ 26101da177e4SLinus Torvalds case -ENOTCONN: 26111da177e4SLinus Torvalds case -ENODEV: 2612ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, 26131da177e4SLinus Torvalds port1, USB_PORT_FEAT_C_RESET); 26141c7439c6SSarah Sharp if (hub_is_superspeed(hub->hdev)) { 2615ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 261675d7cf72SAndiry Xu USB_PORT_FEAT_C_BH_PORT_RESET); 2617ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 261875d7cf72SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 2619ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2620a24a6078SSarah Sharp USB_PORT_FEAT_C_CONNECTION); 26211c7439c6SSarah Sharp } 2622a24a6078SSarah Sharp if (udev) 262375d7cf72SAndiry Xu usb_set_device_state(udev, *status 26241da177e4SLinus Torvalds ? USB_STATE_NOTATTACHED 26251da177e4SLinus Torvalds : USB_STATE_DEFAULT); 262675d7cf72SAndiry Xu break; 262775d7cf72SAndiry Xu } 262875d7cf72SAndiry Xu } 262975d7cf72SAndiry Xu 263075d7cf72SAndiry Xu /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ 263175d7cf72SAndiry Xu static int hub_port_reset(struct usb_hub *hub, int port1, 263275d7cf72SAndiry Xu struct usb_device *udev, unsigned int delay, bool warm) 263375d7cf72SAndiry Xu { 263475d7cf72SAndiry Xu int i, status; 2635a24a6078SSarah Sharp u16 portchange, portstatus; 263675d7cf72SAndiry Xu 263775d7cf72SAndiry Xu if (!hub_is_superspeed(hub->hdev)) { 26380fe51aa5SSarah Sharp if (warm) { 263975d7cf72SAndiry Xu dev_err(hub->intfdev, "only USB3 hub support " 264075d7cf72SAndiry Xu "warm reset\n"); 264175d7cf72SAndiry Xu return -EINVAL; 264275d7cf72SAndiry Xu } 26430fe51aa5SSarah Sharp /* Block EHCI CF initialization during the port reset. 26440fe51aa5SSarah Sharp * Some companion controllers don't like it when they mix. 26450fe51aa5SSarah Sharp */ 26460fe51aa5SSarah Sharp down_read(&ehci_cf_port_reset_rwsem); 2647d3b9d7a9SSarah Sharp } else if (!warm) { 2648d3b9d7a9SSarah Sharp /* 2649d3b9d7a9SSarah Sharp * If the caller hasn't explicitly requested a warm reset, 2650d3b9d7a9SSarah Sharp * double check and see if one is needed. 2651d3b9d7a9SSarah Sharp */ 2652d3b9d7a9SSarah Sharp status = hub_port_status(hub, port1, 2653d3b9d7a9SSarah Sharp &portstatus, &portchange); 2654d3b9d7a9SSarah Sharp if (status < 0) 2655d3b9d7a9SSarah Sharp goto done; 2656d3b9d7a9SSarah Sharp 2657d3b9d7a9SSarah Sharp if (hub_port_warm_reset_required(hub, portstatus)) 2658d3b9d7a9SSarah Sharp warm = true; 265975d7cf72SAndiry Xu } 266075d7cf72SAndiry Xu 266175d7cf72SAndiry Xu /* Reset the port */ 266275d7cf72SAndiry Xu for (i = 0; i < PORT_RESET_TRIES; i++) { 266375d7cf72SAndiry Xu status = set_port_feature(hub->hdev, port1, (warm ? 266475d7cf72SAndiry Xu USB_PORT_FEAT_BH_PORT_RESET : 266575d7cf72SAndiry Xu USB_PORT_FEAT_RESET)); 2666e9e88fb7SAlan Stern if (status == -ENODEV) { 2667e9e88fb7SAlan Stern ; /* The hub is gone */ 2668e9e88fb7SAlan Stern } else if (status) { 266975d7cf72SAndiry Xu dev_err(hub->intfdev, 267075d7cf72SAndiry Xu "cannot %sreset port %d (err = %d)\n", 267175d7cf72SAndiry Xu warm ? "warm " : "", port1, status); 267275d7cf72SAndiry Xu } else { 267375d7cf72SAndiry Xu status = hub_port_wait_reset(hub, port1, udev, delay, 267475d7cf72SAndiry Xu warm); 2675e9e88fb7SAlan Stern if (status && status != -ENOTCONN && status != -ENODEV) 267675d7cf72SAndiry Xu dev_dbg(hub->intfdev, 267775d7cf72SAndiry Xu "port_wait_reset: err = %d\n", 267875d7cf72SAndiry Xu status); 267975d7cf72SAndiry Xu } 268075d7cf72SAndiry Xu 2681a24a6078SSarah Sharp /* Check for disconnect or reset */ 268275d7cf72SAndiry Xu if (status == 0 || status == -ENOTCONN || status == -ENODEV) { 2683a24a6078SSarah Sharp hub_port_finish_reset(hub, port1, udev, &status); 2684a24a6078SSarah Sharp 2685a24a6078SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 268632fe0198SAlan Stern goto done; 2687a24a6078SSarah Sharp 2688a24a6078SSarah Sharp /* 2689a24a6078SSarah Sharp * If a USB 3.0 device migrates from reset to an error 2690a24a6078SSarah Sharp * state, re-issue the warm reset. 2691a24a6078SSarah Sharp */ 2692a24a6078SSarah Sharp if (hub_port_status(hub, port1, 2693a24a6078SSarah Sharp &portstatus, &portchange) < 0) 2694a24a6078SSarah Sharp goto done; 2695a24a6078SSarah Sharp 2696a24a6078SSarah Sharp if (!hub_port_warm_reset_required(hub, portstatus)) 2697a24a6078SSarah Sharp goto done; 2698a24a6078SSarah Sharp 2699a24a6078SSarah Sharp /* 2700a24a6078SSarah Sharp * If the port is in SS.Inactive or Compliance Mode, the 2701a24a6078SSarah Sharp * hot or warm reset failed. Try another warm reset. 2702a24a6078SSarah Sharp */ 2703a24a6078SSarah Sharp if (!warm) { 2704a24a6078SSarah Sharp dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n", 2705a24a6078SSarah Sharp port1); 2706a24a6078SSarah Sharp warm = true; 2707a24a6078SSarah Sharp } 27081da177e4SLinus Torvalds } 27091da177e4SLinus Torvalds 27101da177e4SLinus Torvalds dev_dbg (hub->intfdev, 271175d7cf72SAndiry Xu "port %d not enabled, trying %sreset again...\n", 271275d7cf72SAndiry Xu port1, warm ? "warm " : ""); 27131da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 27141da177e4SLinus Torvalds } 27151da177e4SLinus Torvalds 27161da177e4SLinus Torvalds dev_err (hub->intfdev, 27171da177e4SLinus Torvalds "Cannot enable port %i. Maybe the USB cable is bad?\n", 27181da177e4SLinus Torvalds port1); 27191da177e4SLinus Torvalds 272032fe0198SAlan Stern done: 27210fe51aa5SSarah Sharp if (!hub_is_superspeed(hub->hdev)) 272232fe0198SAlan Stern up_read(&ehci_cf_port_reset_rwsem); 272375d7cf72SAndiry Xu 27241da177e4SLinus Torvalds return status; 27251da177e4SLinus Torvalds } 27261da177e4SLinus Torvalds 27270ed9a57eSAndiry Xu /* Check if a port is power on */ 27280ed9a57eSAndiry Xu static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) 27290ed9a57eSAndiry Xu { 27300ed9a57eSAndiry Xu int ret = 0; 27310ed9a57eSAndiry Xu 27320ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27330ed9a57eSAndiry Xu if (portstatus & USB_SS_PORT_STAT_POWER) 27340ed9a57eSAndiry Xu ret = 1; 27350ed9a57eSAndiry Xu } else { 27360ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_POWER) 27370ed9a57eSAndiry Xu ret = 1; 27380ed9a57eSAndiry Xu } 27390ed9a57eSAndiry Xu 27400ed9a57eSAndiry Xu return ret; 27410ed9a57eSAndiry Xu } 27420ed9a57eSAndiry Xu 2743d388dab7SAlan Stern #ifdef CONFIG_PM 27441da177e4SLinus Torvalds 27450ed9a57eSAndiry Xu /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ 27460ed9a57eSAndiry Xu static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) 27470ed9a57eSAndiry Xu { 27480ed9a57eSAndiry Xu int ret = 0; 27490ed9a57eSAndiry Xu 27500ed9a57eSAndiry Xu if (hub_is_superspeed(hub->hdev)) { 27510ed9a57eSAndiry Xu if ((portstatus & USB_PORT_STAT_LINK_STATE) 27520ed9a57eSAndiry Xu == USB_SS_PORT_LS_U3) 27530ed9a57eSAndiry Xu ret = 1; 27540ed9a57eSAndiry Xu } else { 27550ed9a57eSAndiry Xu if (portstatus & USB_PORT_STAT_SUSPEND) 27560ed9a57eSAndiry Xu ret = 1; 27570ed9a57eSAndiry Xu } 27580ed9a57eSAndiry Xu 27590ed9a57eSAndiry Xu return ret; 27600ed9a57eSAndiry Xu } 2761b01b03f3SAlan Stern 2762b01b03f3SAlan Stern /* Determine whether the device on a port is ready for a normal resume, 2763b01b03f3SAlan Stern * is ready for a reset-resume, or should be disconnected. 2764b01b03f3SAlan Stern */ 2765b01b03f3SAlan Stern static int check_port_resume_type(struct usb_device *udev, 2766b01b03f3SAlan Stern struct usb_hub *hub, int port1, 2767b01b03f3SAlan Stern int status, unsigned portchange, unsigned portstatus) 2768b01b03f3SAlan Stern { 2769b01b03f3SAlan Stern /* Is the device still present? */ 27700ed9a57eSAndiry Xu if (status || port_is_suspended(hub, portstatus) || 27710ed9a57eSAndiry Xu !port_is_power_on(hub, portstatus) || 27720ed9a57eSAndiry Xu !(portstatus & USB_PORT_STAT_CONNECTION)) { 2773b01b03f3SAlan Stern if (status >= 0) 2774b01b03f3SAlan Stern status = -ENODEV; 2775b01b03f3SAlan Stern } 2776b01b03f3SAlan Stern 277786c57edfSAlan Stern /* Can't do a normal resume if the port isn't enabled, 277886c57edfSAlan Stern * so try a reset-resume instead. 277986c57edfSAlan Stern */ 278086c57edfSAlan Stern else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { 278186c57edfSAlan Stern if (udev->persist_enabled) 278286c57edfSAlan Stern udev->reset_resume = 1; 278386c57edfSAlan Stern else 2784b01b03f3SAlan Stern status = -ENODEV; 278586c57edfSAlan Stern } 2786b01b03f3SAlan Stern 2787b01b03f3SAlan Stern if (status) { 2788b01b03f3SAlan Stern dev_dbg(hub->intfdev, 2789b01b03f3SAlan Stern "port %d status %04x.%04x after resume, %d\n", 2790b01b03f3SAlan Stern port1, portchange, portstatus, status); 2791b01b03f3SAlan Stern } else if (udev->reset_resume) { 2792b01b03f3SAlan Stern 2793b01b03f3SAlan Stern /* Late port handoff can set status-change bits */ 2794b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_CONNECTION) 2795ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2796b01b03f3SAlan Stern USB_PORT_FEAT_C_CONNECTION); 2797b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_ENABLE) 2798ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 2799b01b03f3SAlan Stern USB_PORT_FEAT_C_ENABLE); 2800b01b03f3SAlan Stern } 2801b01b03f3SAlan Stern 2802b01b03f3SAlan Stern return status; 2803b01b03f3SAlan Stern } 2804b01b03f3SAlan Stern 2805f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 2806f74631e3SSarah Sharp { 2807f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2808f74631e3SSarah Sharp 2809f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2810f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2811f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2812f74631e3SSarah Sharp return 0; 2813f74631e3SSarah Sharp 2814f74631e3SSarah Sharp /* Clear Feature LTM Enable can only be sent if the device is 2815f74631e3SSarah Sharp * configured. 2816f74631e3SSarah Sharp */ 2817f74631e3SSarah Sharp if (!udev->actconfig) 2818f74631e3SSarah Sharp return 0; 2819f74631e3SSarah Sharp 2820f74631e3SSarah Sharp return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2821f74631e3SSarah Sharp USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 2822f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2823f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2824f74631e3SSarah Sharp } 2825f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 2826f74631e3SSarah Sharp 2827f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) 2828f74631e3SSarah Sharp { 2829f74631e3SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 2830f74631e3SSarah Sharp 2831f74631e3SSarah Sharp /* Check if the roothub and device supports LTM. */ 2832f74631e3SSarah Sharp if (!usb_device_supports_ltm(hcd->self.root_hub) || 2833f74631e3SSarah Sharp !usb_device_supports_ltm(udev)) 2834f74631e3SSarah Sharp return; 2835f74631e3SSarah Sharp 2836f74631e3SSarah Sharp /* Set Feature LTM Enable can only be sent if the device is 2837f74631e3SSarah Sharp * configured. 2838f74631e3SSarah Sharp */ 2839f74631e3SSarah Sharp if (!udev->actconfig) 2840f74631e3SSarah Sharp return; 2841f74631e3SSarah Sharp 2842f74631e3SSarah Sharp usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 2843f74631e3SSarah Sharp USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 2844f74631e3SSarah Sharp USB_DEVICE_LTM_ENABLE, 0, NULL, 0, 2845f74631e3SSarah Sharp USB_CTRL_SET_TIMEOUT); 2846f74631e3SSarah Sharp } 2847f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 2848f74631e3SSarah Sharp 284954a3ac0cSLan Tianyu /* 285028e86165SAlan Stern * usb_enable_remote_wakeup - enable remote wakeup for a device 285154a3ac0cSLan Tianyu * @udev: target device 285254a3ac0cSLan Tianyu * 285328e86165SAlan Stern * For USB-2 devices: Set the device's remote wakeup feature. 285428e86165SAlan Stern * 285528e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 285628e86165SAlan Stern * enable remote wake for the first interface. FIXME if the interface 285728e86165SAlan Stern * association descriptor shows there's more than one function. 285854a3ac0cSLan Tianyu */ 285928e86165SAlan Stern static int usb_enable_remote_wakeup(struct usb_device *udev) 286054a3ac0cSLan Tianyu { 286128e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 286228e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 286328e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, 286428e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 286528e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 286628e86165SAlan Stern else 286728e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 286828e86165SAlan Stern USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, 286928e86165SAlan Stern USB_INTRF_FUNC_SUSPEND, 287028e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_RW | 287128e86165SAlan Stern USB_INTRF_FUNC_SUSPEND_LP, 287228e86165SAlan Stern NULL, 0, USB_CTRL_SET_TIMEOUT); 287328e86165SAlan Stern } 287428e86165SAlan Stern 287528e86165SAlan Stern /* 287628e86165SAlan Stern * usb_disable_remote_wakeup - disable remote wakeup for a device 287728e86165SAlan Stern * @udev: target device 287828e86165SAlan Stern * 287928e86165SAlan Stern * For USB-2 devices: Clear the device's remote wakeup feature. 288028e86165SAlan Stern * 288128e86165SAlan Stern * For USB-3 devices: Assume there's only one function on the device and 288228e86165SAlan Stern * disable remote wake for the first interface. FIXME if the interface 288328e86165SAlan Stern * association descriptor shows there's more than one function. 288428e86165SAlan Stern */ 288528e86165SAlan Stern static int usb_disable_remote_wakeup(struct usb_device *udev) 288628e86165SAlan Stern { 288728e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) 288828e86165SAlan Stern return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 288928e86165SAlan Stern USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, 289028e86165SAlan Stern USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, 289128e86165SAlan Stern USB_CTRL_SET_TIMEOUT); 289228e86165SAlan Stern else 289354a3ac0cSLan Tianyu return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 289454a3ac0cSLan Tianyu USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE, 289554a3ac0cSLan Tianyu USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, 289654a3ac0cSLan Tianyu USB_CTRL_SET_TIMEOUT); 289754a3ac0cSLan Tianyu } 28981da177e4SLinus Torvalds 2899e583d9dbSAlan Stern /* Count of wakeup-enabled devices at or below udev */ 2900e583d9dbSAlan Stern static unsigned wakeup_enabled_descendants(struct usb_device *udev) 2901e583d9dbSAlan Stern { 2902e583d9dbSAlan Stern struct usb_hub *hub = usb_hub_to_struct_hub(udev); 2903e583d9dbSAlan Stern 2904e583d9dbSAlan Stern return udev->do_remote_wakeup + 2905e583d9dbSAlan Stern (hub ? hub->wakeup_enabled_descendants : 0); 2906e583d9dbSAlan Stern } 2907e583d9dbSAlan Stern 29081da177e4SLinus Torvalds /* 2909140d8f68SAlan Stern * usb_port_suspend - suspend a usb device's upstream port 2910624d6c07SAlan Stern * @udev: device that's no longer in active use, not a root hub 29115edbfb7cSDavid Brownell * Context: must be able to sleep; device not locked; pm locks held 29121da177e4SLinus Torvalds * 29131da177e4SLinus Torvalds * Suspends a USB device that isn't in active use, conserving power. 29141da177e4SLinus Torvalds * Devices may wake out of a suspend, if anything important happens, 29151da177e4SLinus Torvalds * using the remote wakeup mechanism. They may also be taken out of 2916140d8f68SAlan Stern * suspend by the host, using usb_port_resume(). It's also routine 29171da177e4SLinus Torvalds * to disconnect devices while they are suspended. 29181da177e4SLinus Torvalds * 2919390a8c34SDavid Brownell * This only affects the USB hardware for a device; its interfaces 2920390a8c34SDavid Brownell * (and, for hubs, child devices) must already have been suspended. 2921390a8c34SDavid Brownell * 2922624d6c07SAlan Stern * Selective port suspend reduces power; most suspended devices draw 2923624d6c07SAlan Stern * less than 500 uA. It's also used in OTG, along with remote wakeup. 2924624d6c07SAlan Stern * All devices below the suspended port are also suspended. 2925624d6c07SAlan Stern * 2926624d6c07SAlan Stern * Devices leave suspend state when the host wakes them up. Some devices 2927624d6c07SAlan Stern * also support "remote wakeup", where the device can activate the USB 2928624d6c07SAlan Stern * tree above them to deliver data, such as a keypress or packet. In 2929624d6c07SAlan Stern * some cases, this wakes the USB host. 2930624d6c07SAlan Stern * 29311da177e4SLinus Torvalds * Suspending OTG devices may trigger HNP, if that's been enabled 29321da177e4SLinus Torvalds * between a pair of dual-role devices. That will change roles, such 29331da177e4SLinus Torvalds * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. 29341da177e4SLinus Torvalds * 29354956eccdSAlan Stern * Devices on USB hub ports have only one "suspend" state, corresponding 29364956eccdSAlan Stern * to ACPI D2, "may cause the device to lose some context". 29374956eccdSAlan Stern * State transitions include: 29384956eccdSAlan Stern * 29394956eccdSAlan Stern * - suspend, resume ... when the VBUS power link stays live 29404956eccdSAlan Stern * - suspend, disconnect ... VBUS lost 29414956eccdSAlan Stern * 29424956eccdSAlan Stern * Once VBUS drop breaks the circuit, the port it's using has to go through 29434956eccdSAlan Stern * normal re-enumeration procedures, starting with enabling VBUS power. 29444956eccdSAlan Stern * Other than re-initializing the hub (plug/unplug, except for root hubs), 29454956eccdSAlan Stern * Linux (2.6) currently has NO mechanisms to initiate that: no khubd 29464956eccdSAlan Stern * timer, no SRP, no requests through sysfs. 29474956eccdSAlan Stern * 2948e583d9dbSAlan Stern * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get 2949e583d9dbSAlan Stern * suspended until their bus goes into global suspend (i.e., the root 29500aa2832dSAlan Stern * hub is suspended). Nevertheless, we change @udev->state to 29510aa2832dSAlan Stern * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual 29520aa2832dSAlan Stern * upstream port setting is stored in @udev->port_is_suspended. 29534956eccdSAlan Stern * 29541da177e4SLinus Torvalds * Returns 0 on success, else negative errno. 29551da177e4SLinus Torvalds */ 295665bfd296SAlan Stern int usb_port_suspend(struct usb_device *udev, pm_message_t msg) 29571da177e4SLinus Torvalds { 2958ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 2959ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 2960624d6c07SAlan Stern int port1 = udev->portnum; 2961624d6c07SAlan Stern int status; 29620aa2832dSAlan Stern bool really_suspend = true; 29634956eccdSAlan Stern 2964624d6c07SAlan Stern /* enable remote wakeup when appropriate; this lets the device 2965624d6c07SAlan Stern * wake up the upstream hub (including maybe the root hub). 2966624d6c07SAlan Stern * 2967624d6c07SAlan Stern * NOTE: OTG devices may issue remote wakeup (or SRP) even when 2968624d6c07SAlan Stern * we don't explicitly enable it here. 2969624d6c07SAlan Stern */ 2970624d6c07SAlan Stern if (udev->do_remote_wakeup) { 297128e86165SAlan Stern status = usb_enable_remote_wakeup(udev); 29720c487206SOliver Neukum if (status) { 2973624d6c07SAlan Stern dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", 2974624d6c07SAlan Stern status); 29750c487206SOliver Neukum /* bail if autosuspend is requested */ 29765b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 29774fae6f0fSAlan Stern goto err_wakeup; 29780c487206SOliver Neukum } 2979624d6c07SAlan Stern } 2980624d6c07SAlan Stern 298165580b43SAndiry Xu /* disable USB2 hardware LPM */ 298265580b43SAndiry Xu if (udev->usb2_hw_lpm_enabled == 1) 298365580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 0); 298465580b43SAndiry Xu 2985f74631e3SSarah Sharp if (usb_disable_ltm(udev)) { 29864fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LTM before suspend\n."); 29874fae6f0fSAlan Stern status = -ENOMEM; 29884fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 29894fae6f0fSAlan Stern goto err_ltm; 2990f74631e3SSarah Sharp } 29918306095fSSarah Sharp if (usb_unlocked_disable_lpm(udev)) { 29924fae6f0fSAlan Stern dev_err(&udev->dev, "Failed to disable LPM before suspend\n."); 29934fae6f0fSAlan Stern status = -ENOMEM; 29944fae6f0fSAlan Stern if (PMSG_IS_AUTO(msg)) 29954fae6f0fSAlan Stern goto err_lpm3; 29968306095fSSarah Sharp } 29978306095fSSarah Sharp 2998624d6c07SAlan Stern /* see 7.1.7.6 */ 2999a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3000c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); 3001e583d9dbSAlan Stern 30020aa2832dSAlan Stern /* 30030aa2832dSAlan Stern * For system suspend, we do not need to enable the suspend feature 30040aa2832dSAlan Stern * on individual USB-2 ports. The devices will automatically go 30050aa2832dSAlan Stern * into suspend a few ms after the root hub stops sending packets. 30060aa2832dSAlan Stern * The USB 2.0 spec calls this "global suspend". 3007e583d9dbSAlan Stern * 3008e583d9dbSAlan Stern * However, many USB hubs have a bug: They don't relay wakeup requests 3009e583d9dbSAlan Stern * from a downstream port if the port's suspend feature isn't on. 3010e583d9dbSAlan Stern * Therefore we will turn on the suspend feature if udev or any of its 3011e583d9dbSAlan Stern * descendants is enabled for remote wakeup. 30120aa2832dSAlan Stern */ 3013e583d9dbSAlan Stern else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0) 3014e583d9dbSAlan Stern status = set_port_feature(hub->hdev, port1, 3015e583d9dbSAlan Stern USB_PORT_FEAT_SUSPEND); 30160aa2832dSAlan Stern else { 30170aa2832dSAlan Stern really_suspend = false; 30180aa2832dSAlan Stern status = 0; 30190aa2832dSAlan Stern } 3020624d6c07SAlan Stern if (status) { 3021624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", 3022624d6c07SAlan Stern port1, status); 3023cbb33004SAlan Stern 30244fae6f0fSAlan Stern /* Try to enable USB3 LPM and LTM again */ 30254fae6f0fSAlan Stern usb_unlocked_enable_lpm(udev); 30264fae6f0fSAlan Stern err_lpm3: 30274fae6f0fSAlan Stern usb_enable_ltm(udev); 30284fae6f0fSAlan Stern err_ltm: 3029c3e751e4SAndiry Xu /* Try to enable USB2 hardware LPM again */ 3030c3e751e4SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 3031c3e751e4SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 3032c3e751e4SAndiry Xu 30334fae6f0fSAlan Stern if (udev->do_remote_wakeup) 30344fae6f0fSAlan Stern (void) usb_disable_remote_wakeup(udev); 30354fae6f0fSAlan Stern err_wakeup: 30368306095fSSarah Sharp 3037cbb33004SAlan Stern /* System sleep transitions should never fail */ 30385b1b0b81SAlan Stern if (!PMSG_IS_AUTO(msg)) 3039cbb33004SAlan Stern status = 0; 3040624d6c07SAlan Stern } else { 304130b1a7a3SAlan Stern dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", 304230b1a7a3SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : ""), 304330b1a7a3SAlan Stern udev->do_remote_wakeup); 30440aa2832dSAlan Stern if (really_suspend) { 3045bfd1e910SAlan Stern udev->port_is_suspended = 1; 3046e583d9dbSAlan Stern 3047e583d9dbSAlan Stern /* device has up to 10 msec to fully suspend */ 3048624d6c07SAlan Stern msleep(10); 3049624d6c07SAlan Stern } 3050e583d9dbSAlan Stern usb_set_device_state(udev, USB_STATE_SUSPENDED); 30510aa2832dSAlan Stern } 3052ad493e5eSLan Tianyu 30534fae6f0fSAlan Stern if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) { 3054ad493e5eSLan Tianyu pm_runtime_put_sync(&port_dev->dev); 3055ad493e5eSLan Tianyu port_dev->did_runtime_put = true; 3056ad493e5eSLan Tianyu } 3057ad493e5eSLan Tianyu 3058c08512c7SAlan Stern usb_mark_last_busy(hub->hdev); 30594956eccdSAlan Stern return status; 30601da177e4SLinus Torvalds } 3061f3f3253dSDavid Brownell 30621da177e4SLinus Torvalds /* 3063390a8c34SDavid Brownell * If the USB "suspend" state is in use (rather than "global suspend"), 3064390a8c34SDavid Brownell * many devices will be individually taken out of suspend state using 306554515fe5SAlan Stern * special "resume" signaling. This routine kicks in shortly after 30661da177e4SLinus Torvalds * hardware resume signaling is finished, either because of selective 30671da177e4SLinus Torvalds * resume (by host) or remote wakeup (by device) ... now see what changed 30681da177e4SLinus Torvalds * in the tree that's rooted at this device. 306954515fe5SAlan Stern * 307054515fe5SAlan Stern * If @udev->reset_resume is set then the device is reset before the 307154515fe5SAlan Stern * status check is done. 30721da177e4SLinus Torvalds */ 3073140d8f68SAlan Stern static int finish_port_resume(struct usb_device *udev) 30741da177e4SLinus Torvalds { 307554515fe5SAlan Stern int status = 0; 307607e72b95SOliver Neukum u16 devstatus = 0; 30771da177e4SLinus Torvalds 30781da177e4SLinus Torvalds /* caller owns the udev device lock */ 3079b9cef6c3SWu Fengguang dev_dbg(&udev->dev, "%s\n", 3080b9cef6c3SWu Fengguang udev->reset_resume ? "finish reset-resume" : "finish resume"); 30811da177e4SLinus Torvalds 30821da177e4SLinus Torvalds /* usb ch9 identifies four variants of SUSPENDED, based on what 30831da177e4SLinus Torvalds * state the device resumes to. Linux currently won't see the 30841da177e4SLinus Torvalds * first two on the host side; they'd be inside hub_port_init() 30851da177e4SLinus Torvalds * during many timeouts, but khubd can't suspend until later. 30861da177e4SLinus Torvalds */ 30871da177e4SLinus Torvalds usb_set_device_state(udev, udev->actconfig 30881da177e4SLinus Torvalds ? USB_STATE_CONFIGURED 30891da177e4SLinus Torvalds : USB_STATE_ADDRESS); 30901da177e4SLinus Torvalds 309154515fe5SAlan Stern /* 10.5.4.5 says not to reset a suspended port if the attached 309254515fe5SAlan Stern * device is enabled for remote wakeup. Hence the reset 309354515fe5SAlan Stern * operation is carried out here, after the port has been 309454515fe5SAlan Stern * resumed. 309554515fe5SAlan Stern */ 309654515fe5SAlan Stern if (udev->reset_resume) 309786c57edfSAlan Stern retry_reset_resume: 3098742120c6SMing Lei status = usb_reset_and_verify_device(udev); 309954515fe5SAlan Stern 31001da177e4SLinus Torvalds /* 10.5.4.5 says be sure devices in the tree are still there. 31011da177e4SLinus Torvalds * For now let's assume the device didn't go crazy on resume, 31021da177e4SLinus Torvalds * and device drivers will know about any resume quirks. 31031da177e4SLinus Torvalds */ 310454515fe5SAlan Stern if (status == 0) { 310546dede46SAlan Stern devstatus = 0; 31061da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); 310786c57edfSAlan Stern 310886c57edfSAlan Stern /* If a normal resume failed, try doing a reset-resume */ 310986c57edfSAlan Stern if (status && !udev->reset_resume && udev->persist_enabled) { 311086c57edfSAlan Stern dev_dbg(&udev->dev, "retry with reset-resume\n"); 311186c57edfSAlan Stern udev->reset_resume = 1; 311286c57edfSAlan Stern goto retry_reset_resume; 311386c57edfSAlan Stern } 311454515fe5SAlan Stern } 3115b40b7a90SAlan Stern 3116624d6c07SAlan Stern if (status) { 3117624d6c07SAlan Stern dev_dbg(&udev->dev, "gone after usb resume? status %d\n", 31181da177e4SLinus Torvalds status); 311907e72b95SOliver Neukum /* 312007e72b95SOliver Neukum * There are a few quirky devices which violate the standard 312107e72b95SOliver Neukum * by claiming to have remote wakeup enabled after a reset, 312207e72b95SOliver Neukum * which crash if the feature is cleared, hence check for 312307e72b95SOliver Neukum * udev->reset_resume 312407e72b95SOliver Neukum */ 312507e72b95SOliver Neukum } else if (udev->actconfig && !udev->reset_resume) { 312628e86165SAlan Stern if (udev->speed < USB_SPEED_SUPER) { 312754a3ac0cSLan Tianyu if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) 312828e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 312954a3ac0cSLan Tianyu } else { 313054a3ac0cSLan Tianyu status = usb_get_status(udev, USB_RECIP_INTERFACE, 0, 313154a3ac0cSLan Tianyu &devstatus); 313254a3ac0cSLan Tianyu if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP 313354a3ac0cSLan Tianyu | USB_INTRF_STAT_FUNC_RW)) 313428e86165SAlan Stern status = usb_disable_remote_wakeup(udev); 313554a3ac0cSLan Tianyu } 313654a3ac0cSLan Tianyu 3137a8e7c565SAlan Stern if (status) 3138b9cef6c3SWu Fengguang dev_dbg(&udev->dev, 3139b9cef6c3SWu Fengguang "disable remote wakeup, status %d\n", 3140b9cef6c3SWu Fengguang status); 31411da177e4SLinus Torvalds status = 0; 31421da177e4SLinus Torvalds } 31431da177e4SLinus Torvalds return status; 31441da177e4SLinus Torvalds } 31451da177e4SLinus Torvalds 3146624d6c07SAlan Stern /* 3147624d6c07SAlan Stern * usb_port_resume - re-activate a suspended usb device's upstream port 3148624d6c07SAlan Stern * @udev: device to re-activate, not a root hub 3149624d6c07SAlan Stern * Context: must be able to sleep; device not locked; pm locks held 3150624d6c07SAlan Stern * 3151624d6c07SAlan Stern * This will re-activate the suspended device, increasing power usage 3152624d6c07SAlan Stern * while letting drivers communicate again with its endpoints. 3153624d6c07SAlan Stern * USB resume explicitly guarantees that the power session between 3154624d6c07SAlan Stern * the host and the device is the same as it was when the device 3155624d6c07SAlan Stern * suspended. 3156624d6c07SAlan Stern * 3157feccc30dSAlan Stern * If @udev->reset_resume is set then this routine won't check that the 3158feccc30dSAlan Stern * port is still enabled. Furthermore, finish_port_resume() above will 315954515fe5SAlan Stern * reset @udev. The end result is that a broken power session can be 316054515fe5SAlan Stern * recovered and @udev will appear to persist across a loss of VBUS power. 316154515fe5SAlan Stern * 316254515fe5SAlan Stern * For example, if a host controller doesn't maintain VBUS suspend current 316354515fe5SAlan Stern * during a system sleep or is reset when the system wakes up, all the USB 316454515fe5SAlan Stern * power sessions below it will be broken. This is especially troublesome 316554515fe5SAlan Stern * for mass-storage devices containing mounted filesystems, since the 316654515fe5SAlan Stern * device will appear to have disconnected and all the memory mappings 316754515fe5SAlan Stern * to it will be lost. Using the USB_PERSIST facility, the device can be 316854515fe5SAlan Stern * made to appear as if it had not disconnected. 316954515fe5SAlan Stern * 3170742120c6SMing Lei * This facility can be dangerous. Although usb_reset_and_verify_device() makes 3171feccc30dSAlan Stern * every effort to insure that the same device is present after the 317254515fe5SAlan Stern * reset as before, it cannot provide a 100% guarantee. Furthermore it's 317354515fe5SAlan Stern * quite possible for a device to remain unaltered but its media to be 317454515fe5SAlan Stern * changed. If the user replaces a flash memory card while the system is 317554515fe5SAlan Stern * asleep, he will have only himself to blame when the filesystem on the 317654515fe5SAlan Stern * new card is corrupted and the system crashes. 317754515fe5SAlan Stern * 3178624d6c07SAlan Stern * Returns 0 on success, else negative errno. 3179624d6c07SAlan Stern */ 318065bfd296SAlan Stern int usb_port_resume(struct usb_device *udev, pm_message_t msg) 31811da177e4SLinus Torvalds { 3182ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); 3183ad493e5eSLan Tianyu struct usb_port *port_dev = hub->ports[udev->portnum - 1]; 3184624d6c07SAlan Stern int port1 = udev->portnum; 31851da177e4SLinus Torvalds int status; 3186d25450c6SAlan Stern u16 portchange, portstatus; 3187d25450c6SAlan Stern 3188ad493e5eSLan Tianyu if (port_dev->did_runtime_put) { 3189ad493e5eSLan Tianyu status = pm_runtime_get_sync(&port_dev->dev); 3190ad493e5eSLan Tianyu port_dev->did_runtime_put = false; 3191ad493e5eSLan Tianyu if (status < 0) { 3192ad493e5eSLan Tianyu dev_dbg(&udev->dev, "can't resume usb port, status %d\n", 3193ad493e5eSLan Tianyu status); 3194ad493e5eSLan Tianyu return status; 3195ad493e5eSLan Tianyu } 3196ad493e5eSLan Tianyu } 3197ad493e5eSLan Tianyu 3198d25450c6SAlan Stern /* Skip the initial Clear-Suspend step for a remote wakeup */ 3199d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 32000ed9a57eSAndiry Xu if (status == 0 && !port_is_suspended(hub, portstatus)) 3201d25450c6SAlan Stern goto SuspendCleared; 32021da177e4SLinus Torvalds 3203781b2137SMatthias Beyer /* dev_dbg(hub->intfdev, "resume port %d\n", port1); */ 32041da177e4SLinus Torvalds 3205d5cbad4bSAlan Stern set_bit(port1, hub->busy_bits); 3206d5cbad4bSAlan Stern 32071da177e4SLinus Torvalds /* see 7.1.7.7; affects power usage, but not budgeting */ 3208a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) 3209c2f60db7SSarah Sharp status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); 3210a7114230SAndiry Xu else 3211ad493e5eSLan Tianyu status = usb_clear_port_feature(hub->hdev, 32121da177e4SLinus Torvalds port1, USB_PORT_FEAT_SUSPEND); 32131da177e4SLinus Torvalds if (status) { 3214624d6c07SAlan Stern dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", 32151da177e4SLinus Torvalds port1, status); 32161da177e4SLinus Torvalds } else { 32171da177e4SLinus Torvalds /* drive resume for at least 20 msec */ 3218645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", 32195b1b0b81SAlan Stern (PMSG_IS_AUTO(msg) ? "auto-" : "")); 32201da177e4SLinus Torvalds msleep(25); 32211da177e4SLinus Torvalds 32221da177e4SLinus Torvalds /* Virtual root hubs can trigger on GET_PORT_STATUS to 32231da177e4SLinus Torvalds * stop resume signaling. Then finish the resume 32241da177e4SLinus Torvalds * sequence. 32251da177e4SLinus Torvalds */ 3226d25450c6SAlan Stern status = hub_port_status(hub, port1, &portstatus, &portchange); 322754515fe5SAlan Stern 32281da177e4SLinus Torvalds /* TRSMRCY = 10 msec */ 32291da177e4SLinus Torvalds msleep(10); 32301da177e4SLinus Torvalds } 3231b01b03f3SAlan Stern 3232b01b03f3SAlan Stern SuspendCleared: 3233b01b03f3SAlan Stern if (status == 0) { 3234bfd1e910SAlan Stern udev->port_is_suspended = 0; 3235a7114230SAndiry Xu if (hub_is_superspeed(hub->hdev)) { 3236a7114230SAndiry Xu if (portchange & USB_PORT_STAT_C_LINK_STATE) 3237ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3238a7114230SAndiry Xu USB_PORT_FEAT_C_PORT_LINK_STATE); 3239a7114230SAndiry Xu } else { 3240b01b03f3SAlan Stern if (portchange & USB_PORT_STAT_C_SUSPEND) 3241ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 3242b01b03f3SAlan Stern USB_PORT_FEAT_C_SUSPEND); 32431da177e4SLinus Torvalds } 3244a7114230SAndiry Xu } 32451da177e4SLinus Torvalds 3246d5cbad4bSAlan Stern clear_bit(port1, hub->busy_bits); 3247d5cbad4bSAlan Stern 3248b01b03f3SAlan Stern status = check_port_resume_type(udev, 3249b01b03f3SAlan Stern hub, port1, status, portchange, portstatus); 325054515fe5SAlan Stern if (status == 0) 325154515fe5SAlan Stern status = finish_port_resume(udev); 325254515fe5SAlan Stern if (status < 0) { 325354515fe5SAlan Stern dev_dbg(&udev->dev, "can't resume, status %d\n", status); 325454515fe5SAlan Stern hub_port_logical_disconnect(hub, port1); 325565580b43SAndiry Xu } else { 325665580b43SAndiry Xu /* Try to enable USB2 hardware LPM */ 325765580b43SAndiry Xu if (udev->usb2_hw_lpm_capable == 1) 325865580b43SAndiry Xu usb_set_usb2_hardware_lpm(udev, 1); 32598306095fSSarah Sharp 3260f74631e3SSarah Sharp /* Try to enable USB3 LTM and LPM */ 3261f74631e3SSarah Sharp usb_enable_ltm(udev); 32628306095fSSarah Sharp usb_unlocked_enable_lpm(udev); 326354515fe5SAlan Stern } 326465580b43SAndiry Xu 32651da177e4SLinus Torvalds return status; 32661da177e4SLinus Torvalds } 32671da177e4SLinus Torvalds 326884ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 326984ebc102SAlan Stern 32708808f00cSAlan Stern /* caller has locked udev */ 32710534d468SAlan Stern int usb_remote_wakeup(struct usb_device *udev) 32721da177e4SLinus Torvalds { 32731da177e4SLinus Torvalds int status = 0; 32741da177e4SLinus Torvalds 32751da177e4SLinus Torvalds if (udev->state == USB_STATE_SUSPENDED) { 3276645daaabSAlan Stern dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); 32779bbdf1e0SAlan Stern status = usb_autoresume_device(udev); 32789bbdf1e0SAlan Stern if (status == 0) { 32799bbdf1e0SAlan Stern /* Let the drivers do their thing, then... */ 32809bbdf1e0SAlan Stern usb_autosuspend_device(udev); 32819bbdf1e0SAlan Stern } 3282d25450c6SAlan Stern } 32831da177e4SLinus Torvalds return status; 32841da177e4SLinus Torvalds } 32851da177e4SLinus Torvalds 3286d388dab7SAlan Stern #endif 3287d388dab7SAlan Stern 3288e6f30deaSMing Lei static int check_ports_changed(struct usb_hub *hub) 3289e6f30deaSMing Lei { 3290e6f30deaSMing Lei int port1; 3291e6f30deaSMing Lei 3292e6f30deaSMing Lei for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { 3293e6f30deaSMing Lei u16 portstatus, portchange; 3294e6f30deaSMing Lei int status; 3295e6f30deaSMing Lei 3296e6f30deaSMing Lei status = hub_port_status(hub, port1, &portstatus, &portchange); 3297e6f30deaSMing Lei if (!status && portchange) 3298e6f30deaSMing Lei return 1; 3299e6f30deaSMing Lei } 3300e6f30deaSMing Lei return 0; 3301e6f30deaSMing Lei } 3302e6f30deaSMing Lei 3303db690874SDavid Brownell static int hub_suspend(struct usb_interface *intf, pm_message_t msg) 33041da177e4SLinus Torvalds { 33051da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata (intf); 33061da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 33071da177e4SLinus Torvalds unsigned port1; 33084296c70aSSarah Sharp int status; 33091da177e4SLinus Torvalds 3310e583d9dbSAlan Stern /* 3311e583d9dbSAlan Stern * Warn if children aren't already suspended. 3312e583d9dbSAlan Stern * Also, add up the number of wakeup-enabled descendants. 3313e583d9dbSAlan Stern */ 3314e583d9dbSAlan Stern hub->wakeup_enabled_descendants = 0; 33151da177e4SLinus Torvalds for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33161da177e4SLinus Torvalds struct usb_device *udev; 33171da177e4SLinus Torvalds 3318ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 33196840d255SAlan Stern if (udev && udev->can_submit) { 3320025d4430SRahul Bedarkar dev_warn(&intf->dev, "port %d not suspended yet\n", 3321025d4430SRahul Bedarkar port1); 33225b1b0b81SAlan Stern if (PMSG_IS_AUTO(msg)) 3323c9f89fa4SDavid Brownell return -EBUSY; 3324c9f89fa4SDavid Brownell } 3325e583d9dbSAlan Stern if (udev) 3326e583d9dbSAlan Stern hub->wakeup_enabled_descendants += 3327e583d9dbSAlan Stern wakeup_enabled_descendants(udev); 33281da177e4SLinus Torvalds } 3329e6f30deaSMing Lei 3330e6f30deaSMing Lei if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { 3331e6f30deaSMing Lei /* check if there are changes pending on hub ports */ 3332e6f30deaSMing Lei if (check_ports_changed(hub)) { 3333e6f30deaSMing Lei if (PMSG_IS_AUTO(msg)) 3334e6f30deaSMing Lei return -EBUSY; 3335e6f30deaSMing Lei pm_wakeup_event(&hdev->dev, 2000); 3336e6f30deaSMing Lei } 3337e6f30deaSMing Lei } 3338e6f30deaSMing Lei 33394296c70aSSarah Sharp if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { 33404296c70aSSarah Sharp /* Enable hub to send remote wakeup for all ports. */ 33414296c70aSSarah Sharp for (port1 = 1; port1 <= hdev->maxchild; port1++) { 33424296c70aSSarah Sharp status = set_port_feature(hdev, 33434296c70aSSarah Sharp port1 | 33444296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_CONNECT | 33454296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | 33464296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, 33474296c70aSSarah Sharp USB_PORT_FEAT_REMOTE_WAKE_MASK); 33484296c70aSSarah Sharp } 33494296c70aSSarah Sharp } 33501da177e4SLinus Torvalds 3351441b62c1SHarvey Harrison dev_dbg(&intf->dev, "%s\n", __func__); 335240f122f3SAlan Stern 3353c9f89fa4SDavid Brownell /* stop khubd and related activity */ 33544330354fSAlan Stern hub_quiesce(hub, HUB_SUSPEND); 3355b6f6436dSAlan Stern return 0; 33561da177e4SLinus Torvalds } 33571da177e4SLinus Torvalds 33581da177e4SLinus Torvalds static int hub_resume(struct usb_interface *intf) 33591da177e4SLinus Torvalds { 33601da177e4SLinus Torvalds struct usb_hub *hub = usb_get_intfdata(intf); 33611da177e4SLinus Torvalds 33625e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3363f2835219SAlan Stern hub_activate(hub, HUB_RESUME); 33641da177e4SLinus Torvalds return 0; 33651da177e4SLinus Torvalds } 33661da177e4SLinus Torvalds 3367b41a60ecSAlan Stern static int hub_reset_resume(struct usb_interface *intf) 3368f07600cfSAlan Stern { 3369b41a60ecSAlan Stern struct usb_hub *hub = usb_get_intfdata(intf); 3370f07600cfSAlan Stern 33715e6effaeSAlan Stern dev_dbg(&intf->dev, "%s\n", __func__); 3372f2835219SAlan Stern hub_activate(hub, HUB_RESET_RESUME); 3373f07600cfSAlan Stern return 0; 3374f07600cfSAlan Stern } 3375f07600cfSAlan Stern 337654515fe5SAlan Stern /** 337754515fe5SAlan Stern * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power 337854515fe5SAlan Stern * @rhdev: struct usb_device for the root hub 337954515fe5SAlan Stern * 338054515fe5SAlan Stern * The USB host controller driver calls this function when its root hub 338154515fe5SAlan Stern * is resumed and Vbus power has been interrupted or the controller 3382feccc30dSAlan Stern * has been reset. The routine marks @rhdev as having lost power. 3383feccc30dSAlan Stern * When the hub driver is resumed it will take notice and carry out 3384feccc30dSAlan Stern * power-session recovery for all the "USB-PERSIST"-enabled child devices; 3385feccc30dSAlan Stern * the others will be disconnected. 338654515fe5SAlan Stern */ 338754515fe5SAlan Stern void usb_root_hub_lost_power(struct usb_device *rhdev) 338854515fe5SAlan Stern { 338954515fe5SAlan Stern dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); 339054515fe5SAlan Stern rhdev->reset_resume = 1; 339154515fe5SAlan Stern } 339254515fe5SAlan Stern EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); 339354515fe5SAlan Stern 33941ea7e0e8SSarah Sharp static const char * const usb3_lpm_names[] = { 33951ea7e0e8SSarah Sharp "U0", 33961ea7e0e8SSarah Sharp "U1", 33971ea7e0e8SSarah Sharp "U2", 33981ea7e0e8SSarah Sharp "U3", 33991ea7e0e8SSarah Sharp }; 34001ea7e0e8SSarah Sharp 34011ea7e0e8SSarah Sharp /* 34021ea7e0e8SSarah Sharp * Send a Set SEL control transfer to the device, prior to enabling 34031ea7e0e8SSarah Sharp * device-initiated U1 or U2. This lets the device know the exit latencies from 34041ea7e0e8SSarah Sharp * the time the device initiates a U1 or U2 exit, to the time it will receive a 34051ea7e0e8SSarah Sharp * packet from the host. 34061ea7e0e8SSarah Sharp * 34071ea7e0e8SSarah Sharp * This function will fail if the SEL or PEL values for udev are greater than 34081ea7e0e8SSarah Sharp * the maximum allowed values for the link state to be enabled. 34091ea7e0e8SSarah Sharp */ 34101ea7e0e8SSarah Sharp static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) 34111ea7e0e8SSarah Sharp { 34121ea7e0e8SSarah Sharp struct usb_set_sel_req *sel_values; 34131ea7e0e8SSarah Sharp unsigned long long u1_sel; 34141ea7e0e8SSarah Sharp unsigned long long u1_pel; 34151ea7e0e8SSarah Sharp unsigned long long u2_sel; 34161ea7e0e8SSarah Sharp unsigned long long u2_pel; 34171ea7e0e8SSarah Sharp int ret; 34181ea7e0e8SSarah Sharp 341938d7f688SXenia Ragiadakou if (udev->state != USB_STATE_CONFIGURED) 342038d7f688SXenia Ragiadakou return 0; 342138d7f688SXenia Ragiadakou 34221ea7e0e8SSarah Sharp /* Convert SEL and PEL stored in ns to us */ 34231ea7e0e8SSarah Sharp u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); 34241ea7e0e8SSarah Sharp u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); 34251ea7e0e8SSarah Sharp u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); 34261ea7e0e8SSarah Sharp u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); 34271ea7e0e8SSarah Sharp 34281ea7e0e8SSarah Sharp /* 34291ea7e0e8SSarah Sharp * Make sure that the calculated SEL and PEL values for the link 34301ea7e0e8SSarah Sharp * state we're enabling aren't bigger than the max SEL/PEL 34311ea7e0e8SSarah Sharp * value that will fit in the SET SEL control transfer. 34321ea7e0e8SSarah Sharp * Otherwise the device would get an incorrect idea of the exit 34331ea7e0e8SSarah Sharp * latency for the link state, and could start a device-initiated 34341ea7e0e8SSarah Sharp * U1/U2 when the exit latencies are too high. 34351ea7e0e8SSarah Sharp */ 34361ea7e0e8SSarah Sharp if ((state == USB3_LPM_U1 && 34371ea7e0e8SSarah Sharp (u1_sel > USB3_LPM_MAX_U1_SEL_PEL || 34381ea7e0e8SSarah Sharp u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || 34391ea7e0e8SSarah Sharp (state == USB3_LPM_U2 && 34401ea7e0e8SSarah Sharp (u2_sel > USB3_LPM_MAX_U2_SEL_PEL || 34411ea7e0e8SSarah Sharp u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { 34421510a1a2SSarah Sharp dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", 34431ea7e0e8SSarah Sharp usb3_lpm_names[state], u1_sel, u1_pel); 34441ea7e0e8SSarah Sharp return -EINVAL; 34451ea7e0e8SSarah Sharp } 34461ea7e0e8SSarah Sharp 34471ea7e0e8SSarah Sharp /* 34481ea7e0e8SSarah Sharp * If we're enabling device-initiated LPM for one link state, 34491ea7e0e8SSarah Sharp * but the other link state has a too high SEL or PEL value, 34501ea7e0e8SSarah Sharp * just set those values to the max in the Set SEL request. 34511ea7e0e8SSarah Sharp */ 34521ea7e0e8SSarah Sharp if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) 34531ea7e0e8SSarah Sharp u1_sel = USB3_LPM_MAX_U1_SEL_PEL; 34541ea7e0e8SSarah Sharp 34551ea7e0e8SSarah Sharp if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) 34561ea7e0e8SSarah Sharp u1_pel = USB3_LPM_MAX_U1_SEL_PEL; 34571ea7e0e8SSarah Sharp 34581ea7e0e8SSarah Sharp if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) 34591ea7e0e8SSarah Sharp u2_sel = USB3_LPM_MAX_U2_SEL_PEL; 34601ea7e0e8SSarah Sharp 34611ea7e0e8SSarah Sharp if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) 34621ea7e0e8SSarah Sharp u2_pel = USB3_LPM_MAX_U2_SEL_PEL; 34631ea7e0e8SSarah Sharp 34641ea7e0e8SSarah Sharp /* 34651ea7e0e8SSarah Sharp * usb_enable_lpm() can be called as part of a failed device reset, 34661ea7e0e8SSarah Sharp * which may be initiated by an error path of a mass storage driver. 34671ea7e0e8SSarah Sharp * Therefore, use GFP_NOIO. 34681ea7e0e8SSarah Sharp */ 34691ea7e0e8SSarah Sharp sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); 34701ea7e0e8SSarah Sharp if (!sel_values) 34711ea7e0e8SSarah Sharp return -ENOMEM; 34721ea7e0e8SSarah Sharp 34731ea7e0e8SSarah Sharp sel_values->u1_sel = u1_sel; 34741ea7e0e8SSarah Sharp sel_values->u1_pel = u1_pel; 34751ea7e0e8SSarah Sharp sel_values->u2_sel = cpu_to_le16(u2_sel); 34761ea7e0e8SSarah Sharp sel_values->u2_pel = cpu_to_le16(u2_pel); 34771ea7e0e8SSarah Sharp 34781ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 34791ea7e0e8SSarah Sharp USB_REQ_SET_SEL, 34801ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 34811ea7e0e8SSarah Sharp 0, 0, 34821ea7e0e8SSarah Sharp sel_values, sizeof *(sel_values), 34831ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 34841ea7e0e8SSarah Sharp kfree(sel_values); 34851ea7e0e8SSarah Sharp return ret; 34861ea7e0e8SSarah Sharp } 34871ea7e0e8SSarah Sharp 34881ea7e0e8SSarah Sharp /* 34891ea7e0e8SSarah Sharp * Enable or disable device-initiated U1 or U2 transitions. 34901ea7e0e8SSarah Sharp */ 34911ea7e0e8SSarah Sharp static int usb_set_device_initiated_lpm(struct usb_device *udev, 34921ea7e0e8SSarah Sharp enum usb3_link_state state, bool enable) 34931ea7e0e8SSarah Sharp { 34941ea7e0e8SSarah Sharp int ret; 34951ea7e0e8SSarah Sharp int feature; 34961ea7e0e8SSarah Sharp 34971ea7e0e8SSarah Sharp switch (state) { 34981ea7e0e8SSarah Sharp case USB3_LPM_U1: 34991ea7e0e8SSarah Sharp feature = USB_DEVICE_U1_ENABLE; 35001ea7e0e8SSarah Sharp break; 35011ea7e0e8SSarah Sharp case USB3_LPM_U2: 35021ea7e0e8SSarah Sharp feature = USB_DEVICE_U2_ENABLE; 35031ea7e0e8SSarah Sharp break; 35041ea7e0e8SSarah Sharp default: 35051ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", 35061ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable"); 35071ea7e0e8SSarah Sharp return -EINVAL; 35081ea7e0e8SSarah Sharp } 35091ea7e0e8SSarah Sharp 35101ea7e0e8SSarah Sharp if (udev->state != USB_STATE_CONFIGURED) { 35111ea7e0e8SSarah Sharp dev_dbg(&udev->dev, "%s: Can't %s %s state " 35121ea7e0e8SSarah Sharp "for unconfigured device.\n", 35131ea7e0e8SSarah Sharp __func__, enable ? "enable" : "disable", 35141ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35151ea7e0e8SSarah Sharp return 0; 35161ea7e0e8SSarah Sharp } 35171ea7e0e8SSarah Sharp 35181ea7e0e8SSarah Sharp if (enable) { 35191ea7e0e8SSarah Sharp /* 35201ea7e0e8SSarah Sharp * Now send the control transfer to enable device-initiated LPM 35211ea7e0e8SSarah Sharp * for either U1 or U2. 35221ea7e0e8SSarah Sharp */ 35231ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35241ea7e0e8SSarah Sharp USB_REQ_SET_FEATURE, 35251ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35261ea7e0e8SSarah Sharp feature, 35271ea7e0e8SSarah Sharp 0, NULL, 0, 35281ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35291ea7e0e8SSarah Sharp } else { 35301ea7e0e8SSarah Sharp ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 35311ea7e0e8SSarah Sharp USB_REQ_CLEAR_FEATURE, 35321ea7e0e8SSarah Sharp USB_RECIP_DEVICE, 35331ea7e0e8SSarah Sharp feature, 35341ea7e0e8SSarah Sharp 0, NULL, 0, 35351ea7e0e8SSarah Sharp USB_CTRL_SET_TIMEOUT); 35361ea7e0e8SSarah Sharp } 35371ea7e0e8SSarah Sharp if (ret < 0) { 35381ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", 35391ea7e0e8SSarah Sharp enable ? "Enable" : "Disable", 35401ea7e0e8SSarah Sharp usb3_lpm_names[state]); 35411ea7e0e8SSarah Sharp return -EBUSY; 35421ea7e0e8SSarah Sharp } 35431ea7e0e8SSarah Sharp return 0; 35441ea7e0e8SSarah Sharp } 35451ea7e0e8SSarah Sharp 35461ea7e0e8SSarah Sharp static int usb_set_lpm_timeout(struct usb_device *udev, 35471ea7e0e8SSarah Sharp enum usb3_link_state state, int timeout) 35481ea7e0e8SSarah Sharp { 35491ea7e0e8SSarah Sharp int ret; 35501ea7e0e8SSarah Sharp int feature; 35511ea7e0e8SSarah Sharp 35521ea7e0e8SSarah Sharp switch (state) { 35531ea7e0e8SSarah Sharp case USB3_LPM_U1: 35541ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 35551ea7e0e8SSarah Sharp break; 35561ea7e0e8SSarah Sharp case USB3_LPM_U2: 35571ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 35581ea7e0e8SSarah Sharp break; 35591ea7e0e8SSarah Sharp default: 35601ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", 35611ea7e0e8SSarah Sharp __func__); 35621ea7e0e8SSarah Sharp return -EINVAL; 35631ea7e0e8SSarah Sharp } 35641ea7e0e8SSarah Sharp 35651ea7e0e8SSarah Sharp if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && 35661ea7e0e8SSarah Sharp timeout != USB3_LPM_DEVICE_INITIATED) { 35671ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " 35681ea7e0e8SSarah Sharp "which is a reserved value.\n", 35691ea7e0e8SSarah Sharp usb3_lpm_names[state], timeout); 35701ea7e0e8SSarah Sharp return -EINVAL; 35711ea7e0e8SSarah Sharp } 35721ea7e0e8SSarah Sharp 35731ea7e0e8SSarah Sharp ret = set_port_feature(udev->parent, 35741ea7e0e8SSarah Sharp USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, 35751ea7e0e8SSarah Sharp feature); 35761ea7e0e8SSarah Sharp if (ret < 0) { 35771ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," 35781ea7e0e8SSarah Sharp "error code %i\n", usb3_lpm_names[state], 35791ea7e0e8SSarah Sharp timeout, ret); 35801ea7e0e8SSarah Sharp return -EBUSY; 35811ea7e0e8SSarah Sharp } 35821ea7e0e8SSarah Sharp if (state == USB3_LPM_U1) 35831ea7e0e8SSarah Sharp udev->u1_params.timeout = timeout; 35841ea7e0e8SSarah Sharp else 35851ea7e0e8SSarah Sharp udev->u2_params.timeout = timeout; 35861ea7e0e8SSarah Sharp return 0; 35871ea7e0e8SSarah Sharp } 35881ea7e0e8SSarah Sharp 35891ea7e0e8SSarah Sharp /* 35901ea7e0e8SSarah Sharp * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated 35911ea7e0e8SSarah Sharp * U1/U2 entry. 35921ea7e0e8SSarah Sharp * 35931ea7e0e8SSarah Sharp * We will attempt to enable U1 or U2, but there are no guarantees that the 35941ea7e0e8SSarah Sharp * control transfers to set the hub timeout or enable device-initiated U1/U2 35951ea7e0e8SSarah Sharp * will be successful. 35961ea7e0e8SSarah Sharp * 35971ea7e0e8SSarah Sharp * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI 35981ea7e0e8SSarah Sharp * driver know about it. If that call fails, it should be harmless, and just 35991ea7e0e8SSarah Sharp * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. 36001ea7e0e8SSarah Sharp */ 36011ea7e0e8SSarah Sharp static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36021ea7e0e8SSarah Sharp enum usb3_link_state state) 36031ea7e0e8SSarah Sharp { 360465a95b75SSarah Sharp int timeout, ret; 3605ae8963adSSarah Sharp __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; 3606ae8963adSSarah Sharp __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; 3607ae8963adSSarah Sharp 3608ae8963adSSarah Sharp /* If the device says it doesn't have *any* exit latency to come out of 3609ae8963adSSarah Sharp * U1 or U2, it's probably lying. Assume it doesn't implement that link 3610ae8963adSSarah Sharp * state. 3611ae8963adSSarah Sharp */ 3612ae8963adSSarah Sharp if ((state == USB3_LPM_U1 && u1_mel == 0) || 3613ae8963adSSarah Sharp (state == USB3_LPM_U2 && u2_mel == 0)) 3614ae8963adSSarah Sharp return; 36151ea7e0e8SSarah Sharp 361665a95b75SSarah Sharp /* 361765a95b75SSarah Sharp * First, let the device know about the exit latencies 361865a95b75SSarah Sharp * associated with the link state we're about to enable. 361965a95b75SSarah Sharp */ 362065a95b75SSarah Sharp ret = usb_req_set_sel(udev, state); 362165a95b75SSarah Sharp if (ret < 0) { 362265a95b75SSarah Sharp dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", 362365a95b75SSarah Sharp usb3_lpm_names[state]); 362465a95b75SSarah Sharp return; 362565a95b75SSarah Sharp } 362665a95b75SSarah Sharp 36271ea7e0e8SSarah Sharp /* We allow the host controller to set the U1/U2 timeout internally 36281ea7e0e8SSarah Sharp * first, so that it can change its schedule to account for the 36291ea7e0e8SSarah Sharp * additional latency to send data to a device in a lower power 36301ea7e0e8SSarah Sharp * link state. 36311ea7e0e8SSarah Sharp */ 36321ea7e0e8SSarah Sharp timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); 36331ea7e0e8SSarah Sharp 36341ea7e0e8SSarah Sharp /* xHCI host controller doesn't want to enable this LPM state. */ 36351ea7e0e8SSarah Sharp if (timeout == 0) 36361ea7e0e8SSarah Sharp return; 36371ea7e0e8SSarah Sharp 36381ea7e0e8SSarah Sharp if (timeout < 0) { 36391ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not enable %s link state, " 36401ea7e0e8SSarah Sharp "xHCI error %i.\n", usb3_lpm_names[state], 36411ea7e0e8SSarah Sharp timeout); 36421ea7e0e8SSarah Sharp return; 36431ea7e0e8SSarah Sharp } 36441ea7e0e8SSarah Sharp 36451ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, timeout)) 36461ea7e0e8SSarah Sharp /* If we can't set the parent hub U1/U2 timeout, 36471ea7e0e8SSarah Sharp * device-initiated LPM won't be allowed either, so let the xHCI 36481ea7e0e8SSarah Sharp * host know that this link state won't be enabled. 36491ea7e0e8SSarah Sharp */ 36501ea7e0e8SSarah Sharp hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); 36511ea7e0e8SSarah Sharp 36521ea7e0e8SSarah Sharp /* Only a configured device will accept the Set Feature U1/U2_ENABLE */ 36531ea7e0e8SSarah Sharp else if (udev->actconfig) 36541ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, true); 36551ea7e0e8SSarah Sharp 36561ea7e0e8SSarah Sharp } 36571ea7e0e8SSarah Sharp 36581ea7e0e8SSarah Sharp /* 36591ea7e0e8SSarah Sharp * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated 36601ea7e0e8SSarah Sharp * U1/U2 entry. 36611ea7e0e8SSarah Sharp * 36621ea7e0e8SSarah Sharp * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. 36631ea7e0e8SSarah Sharp * If zero is returned, the parent will not allow the link to go into U1/U2. 36641ea7e0e8SSarah Sharp * 36651ea7e0e8SSarah Sharp * If zero is returned, device-initiated U1/U2 entry may still be enabled, but 36661ea7e0e8SSarah Sharp * it won't have an effect on the bus link state because the parent hub will 36671ea7e0e8SSarah Sharp * still disallow device-initiated U1/U2 entry. 36681ea7e0e8SSarah Sharp * 36691ea7e0e8SSarah Sharp * If zero is returned, the xHCI host controller may still think U1/U2 entry is 36701ea7e0e8SSarah Sharp * possible. The result will be slightly more bus bandwidth will be taken up 36711ea7e0e8SSarah Sharp * (to account for U1/U2 exit latency), but it should be harmless. 36721ea7e0e8SSarah Sharp */ 36731ea7e0e8SSarah Sharp static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, 36741ea7e0e8SSarah Sharp enum usb3_link_state state) 36751ea7e0e8SSarah Sharp { 36761ea7e0e8SSarah Sharp int feature; 36771ea7e0e8SSarah Sharp 36781ea7e0e8SSarah Sharp switch (state) { 36791ea7e0e8SSarah Sharp case USB3_LPM_U1: 36801ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U1_TIMEOUT; 36811ea7e0e8SSarah Sharp break; 36821ea7e0e8SSarah Sharp case USB3_LPM_U2: 36831ea7e0e8SSarah Sharp feature = USB_PORT_FEAT_U2_TIMEOUT; 36841ea7e0e8SSarah Sharp break; 36851ea7e0e8SSarah Sharp default: 36861ea7e0e8SSarah Sharp dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", 36871ea7e0e8SSarah Sharp __func__); 36881ea7e0e8SSarah Sharp return -EINVAL; 36891ea7e0e8SSarah Sharp } 36901ea7e0e8SSarah Sharp 36911ea7e0e8SSarah Sharp if (usb_set_lpm_timeout(udev, state, 0)) 36921ea7e0e8SSarah Sharp return -EBUSY; 36931ea7e0e8SSarah Sharp 36941ea7e0e8SSarah Sharp usb_set_device_initiated_lpm(udev, state, false); 36951ea7e0e8SSarah Sharp 36961ea7e0e8SSarah Sharp if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) 36971ea7e0e8SSarah Sharp dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " 36981ea7e0e8SSarah Sharp "bus schedule bandwidth may be impacted.\n", 36991ea7e0e8SSarah Sharp usb3_lpm_names[state]); 37001ea7e0e8SSarah Sharp return 0; 37011ea7e0e8SSarah Sharp } 37021ea7e0e8SSarah Sharp 37031ea7e0e8SSarah Sharp /* 37041ea7e0e8SSarah Sharp * Disable hub-initiated and device-initiated U1 and U2 entry. 37051ea7e0e8SSarah Sharp * Caller must own the bandwidth_mutex. 37061ea7e0e8SSarah Sharp * 37071ea7e0e8SSarah Sharp * This will call usb_enable_lpm() on failure, which will decrement 37081ea7e0e8SSarah Sharp * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. 37091ea7e0e8SSarah Sharp */ 37101ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 37111ea7e0e8SSarah Sharp { 37121ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37131ea7e0e8SSarah Sharp 37141ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37151ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37161ea7e0e8SSarah Sharp !udev->lpm_capable) 37171ea7e0e8SSarah Sharp return 0; 37181ea7e0e8SSarah Sharp 37191ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37201ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) 37211ea7e0e8SSarah Sharp return 0; 37221ea7e0e8SSarah Sharp 37231ea7e0e8SSarah Sharp udev->lpm_disable_count++; 372455558c33SDan Carpenter if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) 37251ea7e0e8SSarah Sharp return 0; 37261ea7e0e8SSarah Sharp 37271ea7e0e8SSarah Sharp /* If LPM is enabled, attempt to disable it. */ 37281ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) 37291ea7e0e8SSarah Sharp goto enable_lpm; 37301ea7e0e8SSarah Sharp if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) 37311ea7e0e8SSarah Sharp goto enable_lpm; 37321ea7e0e8SSarah Sharp 37331ea7e0e8SSarah Sharp return 0; 37341ea7e0e8SSarah Sharp 37351ea7e0e8SSarah Sharp enable_lpm: 37361ea7e0e8SSarah Sharp usb_enable_lpm(udev); 37371ea7e0e8SSarah Sharp return -EBUSY; 37381ea7e0e8SSarah Sharp } 37391ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 37401ea7e0e8SSarah Sharp 37411ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_disable_lpm() */ 37421ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 37431ea7e0e8SSarah Sharp { 37441ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37451ea7e0e8SSarah Sharp int ret; 37461ea7e0e8SSarah Sharp 37471ea7e0e8SSarah Sharp if (!hcd) 37481ea7e0e8SSarah Sharp return -EINVAL; 37491ea7e0e8SSarah Sharp 37501ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 37511ea7e0e8SSarah Sharp ret = usb_disable_lpm(udev); 37521ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 37531ea7e0e8SSarah Sharp 37541ea7e0e8SSarah Sharp return ret; 37551ea7e0e8SSarah Sharp } 37561ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 37571ea7e0e8SSarah Sharp 37581ea7e0e8SSarah Sharp /* 37591ea7e0e8SSarah Sharp * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The 37601ea7e0e8SSarah Sharp * xHCI host policy may prevent U1 or U2 from being enabled. 37611ea7e0e8SSarah Sharp * 37621ea7e0e8SSarah Sharp * Other callers may have disabled link PM, so U1 and U2 entry will be disabled 37631ea7e0e8SSarah Sharp * until the lpm_disable_count drops to zero. Caller must own the 37641ea7e0e8SSarah Sharp * bandwidth_mutex. 37651ea7e0e8SSarah Sharp */ 37661ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) 37671ea7e0e8SSarah Sharp { 37681ea7e0e8SSarah Sharp struct usb_hcd *hcd; 37691ea7e0e8SSarah Sharp 37701ea7e0e8SSarah Sharp if (!udev || !udev->parent || 37711ea7e0e8SSarah Sharp udev->speed != USB_SPEED_SUPER || 37721ea7e0e8SSarah Sharp !udev->lpm_capable) 37731ea7e0e8SSarah Sharp return; 37741ea7e0e8SSarah Sharp 37751ea7e0e8SSarah Sharp udev->lpm_disable_count--; 37761ea7e0e8SSarah Sharp hcd = bus_to_hcd(udev->bus); 37771ea7e0e8SSarah Sharp /* Double check that we can both enable and disable LPM. 37781ea7e0e8SSarah Sharp * Device must be configured to accept set feature U1/U2 timeout. 37791ea7e0e8SSarah Sharp */ 37801ea7e0e8SSarah Sharp if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || 37811ea7e0e8SSarah Sharp !hcd->driver->disable_usb3_lpm_timeout) 37821ea7e0e8SSarah Sharp return; 37831ea7e0e8SSarah Sharp 37841ea7e0e8SSarah Sharp if (udev->lpm_disable_count > 0) 37851ea7e0e8SSarah Sharp return; 37861ea7e0e8SSarah Sharp 37871ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U1); 37881ea7e0e8SSarah Sharp usb_enable_link_state(hcd, udev, USB3_LPM_U2); 37891ea7e0e8SSarah Sharp } 37901ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 37911ea7e0e8SSarah Sharp 37921ea7e0e8SSarah Sharp /* Grab the bandwidth_mutex before calling usb_enable_lpm() */ 37931ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) 37941ea7e0e8SSarah Sharp { 37951ea7e0e8SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 37961ea7e0e8SSarah Sharp 37971ea7e0e8SSarah Sharp if (!hcd) 37981ea7e0e8SSarah Sharp return; 37991ea7e0e8SSarah Sharp 38001ea7e0e8SSarah Sharp mutex_lock(hcd->bandwidth_mutex); 38011ea7e0e8SSarah Sharp usb_enable_lpm(udev); 38021ea7e0e8SSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 38031ea7e0e8SSarah Sharp } 38041ea7e0e8SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 38051ea7e0e8SSarah Sharp 38061ea7e0e8SSarah Sharp 3807d388dab7SAlan Stern #else /* CONFIG_PM */ 3808d388dab7SAlan Stern 3809511366daSAndrew Morton #define hub_suspend NULL 3810511366daSAndrew Morton #define hub_resume NULL 3811f07600cfSAlan Stern #define hub_reset_resume NULL 38121ea7e0e8SSarah Sharp 38131ea7e0e8SSarah Sharp int usb_disable_lpm(struct usb_device *udev) 38141ea7e0e8SSarah Sharp { 38151ea7e0e8SSarah Sharp return 0; 38161ea7e0e8SSarah Sharp } 3817e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_lpm); 38181ea7e0e8SSarah Sharp 38191ea7e0e8SSarah Sharp void usb_enable_lpm(struct usb_device *udev) { } 3820e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_lpm); 38211ea7e0e8SSarah Sharp 38221ea7e0e8SSarah Sharp int usb_unlocked_disable_lpm(struct usb_device *udev) 38231ea7e0e8SSarah Sharp { 38241ea7e0e8SSarah Sharp return 0; 38251ea7e0e8SSarah Sharp } 3826e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); 38271ea7e0e8SSarah Sharp 38281ea7e0e8SSarah Sharp void usb_unlocked_enable_lpm(struct usb_device *udev) { } 3829e9261fb6SSarah Sharp EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); 3830f74631e3SSarah Sharp 3831f74631e3SSarah Sharp int usb_disable_ltm(struct usb_device *udev) 3832f74631e3SSarah Sharp { 3833f74631e3SSarah Sharp return 0; 3834f74631e3SSarah Sharp } 3835f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_disable_ltm); 3836f74631e3SSarah Sharp 3837f74631e3SSarah Sharp void usb_enable_ltm(struct usb_device *udev) { } 3838f74631e3SSarah Sharp EXPORT_SYMBOL_GPL(usb_enable_ltm); 3839c4b51a43SAlan Stern 3840c4b51a43SAlan Stern #endif /* CONFIG_PM */ 3841d388dab7SAlan Stern 38421da177e4SLinus Torvalds 38431da177e4SLinus Torvalds /* USB 2.0 spec, 7.1.7.3 / fig 7-29: 38441da177e4SLinus Torvalds * 38451da177e4SLinus Torvalds * Between connect detection and reset signaling there must be a delay 38461da177e4SLinus Torvalds * of 100ms at least for debounce and power-settling. The corresponding 38471da177e4SLinus Torvalds * timer shall restart whenever the downstream port detects a disconnect. 38481da177e4SLinus Torvalds * 38491da177e4SLinus Torvalds * Apparently there are some bluetooth and irda-dongles and a number of 38501da177e4SLinus Torvalds * low-speed devices for which this debounce period may last over a second. 38511da177e4SLinus Torvalds * Not covered by the spec - but easy to deal with. 38521da177e4SLinus Torvalds * 38531da177e4SLinus Torvalds * This implementation uses a 1500ms total debounce timeout; if the 38541da177e4SLinus Torvalds * connection isn't stable by then it returns -ETIMEDOUT. It checks 38551da177e4SLinus Torvalds * every 25ms for transient disconnects. When the port status has been 38561da177e4SLinus Torvalds * unchanged for 100ms it returns the port status. 38571da177e4SLinus Torvalds */ 3858ad493e5eSLan Tianyu int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) 38591da177e4SLinus Torvalds { 38601da177e4SLinus Torvalds int ret; 38611da177e4SLinus Torvalds int total_time, stable_time = 0; 38621da177e4SLinus Torvalds u16 portchange, portstatus; 38631da177e4SLinus Torvalds unsigned connection = 0xffff; 38641da177e4SLinus Torvalds 38651da177e4SLinus Torvalds for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { 38661da177e4SLinus Torvalds ret = hub_port_status(hub, port1, &portstatus, &portchange); 38671da177e4SLinus Torvalds if (ret < 0) 38681da177e4SLinus Torvalds return ret; 38691da177e4SLinus Torvalds 38701da177e4SLinus Torvalds if (!(portchange & USB_PORT_STAT_C_CONNECTION) && 38711da177e4SLinus Torvalds (portstatus & USB_PORT_STAT_CONNECTION) == connection) { 3872ad493e5eSLan Tianyu if (!must_be_connected || 3873ad493e5eSLan Tianyu (connection == USB_PORT_STAT_CONNECTION)) 38741da177e4SLinus Torvalds stable_time += HUB_DEBOUNCE_STEP; 38751da177e4SLinus Torvalds if (stable_time >= HUB_DEBOUNCE_STABLE) 38761da177e4SLinus Torvalds break; 38771da177e4SLinus Torvalds } else { 38781da177e4SLinus Torvalds stable_time = 0; 38791da177e4SLinus Torvalds connection = portstatus & USB_PORT_STAT_CONNECTION; 38801da177e4SLinus Torvalds } 38811da177e4SLinus Torvalds 38821da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 3883ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, port1, 38841da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 38851da177e4SLinus Torvalds } 38861da177e4SLinus Torvalds 38871da177e4SLinus Torvalds if (total_time >= HUB_DEBOUNCE_TIMEOUT) 38881da177e4SLinus Torvalds break; 38891da177e4SLinus Torvalds msleep(HUB_DEBOUNCE_STEP); 38901da177e4SLinus Torvalds } 38911da177e4SLinus Torvalds 38921da177e4SLinus Torvalds dev_dbg (hub->intfdev, 38931da177e4SLinus Torvalds "debounce: port %d: total %dms stable %dms status 0x%x\n", 38941da177e4SLinus Torvalds port1, total_time, stable_time, portstatus); 38951da177e4SLinus Torvalds 38961da177e4SLinus Torvalds if (stable_time < HUB_DEBOUNCE_STABLE) 38971da177e4SLinus Torvalds return -ETIMEDOUT; 38981da177e4SLinus Torvalds return portstatus; 38991da177e4SLinus Torvalds } 39001da177e4SLinus Torvalds 3901fc721f51SInaky Perez-Gonzalez void usb_ep0_reinit(struct usb_device *udev) 39021da177e4SLinus Torvalds { 3903ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); 3904ddeac4e7SAlan Stern usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); 39052caf7fcdSAlan Stern usb_enable_endpoint(udev, &udev->ep0, true); 39061da177e4SLinus Torvalds } 3907fc721f51SInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_ep0_reinit); 39081da177e4SLinus Torvalds 39091da177e4SLinus Torvalds #define usb_sndaddr0pipe() (PIPE_CONTROL << 30) 39101da177e4SLinus Torvalds #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) 39111da177e4SLinus Torvalds 39124326ed0bSAlan Stern static int hub_set_address(struct usb_device *udev, int devnum) 39131da177e4SLinus Torvalds { 39141da177e4SLinus Torvalds int retval; 3915c6515272SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 39161da177e4SLinus Torvalds 3917c6515272SSarah Sharp /* 3918c6515272SSarah Sharp * The host controller will choose the device address, 3919c6515272SSarah Sharp * instead of the core having chosen it earlier 3920c6515272SSarah Sharp */ 3921c6515272SSarah Sharp if (!hcd->driver->address_device && devnum <= 1) 39221da177e4SLinus Torvalds return -EINVAL; 39231da177e4SLinus Torvalds if (udev->state == USB_STATE_ADDRESS) 39241da177e4SLinus Torvalds return 0; 39251da177e4SLinus Torvalds if (udev->state != USB_STATE_DEFAULT) 39261da177e4SLinus Torvalds return -EINVAL; 3927c8d4af8eSAndiry Xu if (hcd->driver->address_device) 3928c6515272SSarah Sharp retval = hcd->driver->address_device(hcd, udev); 3929c8d4af8eSAndiry Xu else 39301da177e4SLinus Torvalds retval = usb_control_msg(udev, usb_sndaddr0pipe(), 39314326ed0bSAlan Stern USB_REQ_SET_ADDRESS, 0, devnum, 0, 39321da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 39331da177e4SLinus Torvalds if (retval == 0) { 39343b29b68bSAlan Stern update_devnum(udev, devnum); 39354953d141SDavid Vrabel /* Device now using proper address. */ 39361da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_ADDRESS); 3937fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 39381da177e4SLinus Torvalds } 39391da177e4SLinus Torvalds return retval; 39401da177e4SLinus Torvalds } 39411da177e4SLinus Torvalds 3942890dae88SMathias Nyman /* 3943890dae88SMathias Nyman * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM 3944890dae88SMathias Nyman * when they're plugged into a USB 2.0 port, but they don't work when LPM is 3945890dae88SMathias Nyman * enabled. 3946890dae88SMathias Nyman * 3947890dae88SMathias Nyman * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the 3948890dae88SMathias Nyman * device says it supports the new USB 2.0 Link PM errata by setting the BESL 3949890dae88SMathias Nyman * support bit in the BOS descriptor. 3950890dae88SMathias Nyman */ 3951890dae88SMathias Nyman static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) 3952890dae88SMathias Nyman { 3953890dae88SMathias Nyman int connect_type; 3954890dae88SMathias Nyman 3955890dae88SMathias Nyman if (!udev->usb2_hw_lpm_capable) 3956890dae88SMathias Nyman return; 3957890dae88SMathias Nyman 3958890dae88SMathias Nyman connect_type = usb_get_hub_port_connect_type(udev->parent, 3959890dae88SMathias Nyman udev->portnum); 3960890dae88SMathias Nyman 3961890dae88SMathias Nyman if ((udev->bos->ext_cap->bmAttributes & USB_BESL_SUPPORT) || 3962890dae88SMathias Nyman connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 3963890dae88SMathias Nyman udev->usb2_hw_lpm_allowed = 1; 3964890dae88SMathias Nyman usb_set_usb2_hardware_lpm(udev, 1); 3965890dae88SMathias Nyman } 3966890dae88SMathias Nyman } 3967890dae88SMathias Nyman 396848fc7dbdSDan Williams static int hub_enable_device(struct usb_device *udev) 396948fc7dbdSDan Williams { 397048fc7dbdSDan Williams struct usb_hcd *hcd = bus_to_hcd(udev->bus); 397148fc7dbdSDan Williams 397248fc7dbdSDan Williams if (!hcd->driver->enable_device) 397348fc7dbdSDan Williams return 0; 397448fc7dbdSDan Williams if (udev->state == USB_STATE_ADDRESS) 397548fc7dbdSDan Williams return 0; 397648fc7dbdSDan Williams if (udev->state != USB_STATE_DEFAULT) 397748fc7dbdSDan Williams return -EINVAL; 397848fc7dbdSDan Williams 397948fc7dbdSDan Williams return hcd->driver->enable_device(hcd, udev); 398048fc7dbdSDan Williams } 398148fc7dbdSDan Williams 39821da177e4SLinus Torvalds /* Reset device, (re)assign address, get device descriptor. 39831da177e4SLinus Torvalds * Device connection must be stable, no more debouncing needed. 39841da177e4SLinus Torvalds * Returns device in USB_STATE_ADDRESS, except on error. 39851da177e4SLinus Torvalds * 39861da177e4SLinus Torvalds * If this is called for an already-existing device (as part of 3987742120c6SMing Lei * usb_reset_and_verify_device), the caller must own the device lock. For a 39881da177e4SLinus Torvalds * newly detected device that is not accessible through any global 39891da177e4SLinus Torvalds * pointers, it's not necessary to lock the device. 39901da177e4SLinus Torvalds */ 39911da177e4SLinus Torvalds static int 39921da177e4SLinus Torvalds hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1, 39931da177e4SLinus Torvalds int retry_counter) 39941da177e4SLinus Torvalds { 39954186ecf8SArjan van de Ven static DEFINE_MUTEX(usb_address0_mutex); 39961da177e4SLinus Torvalds 39971da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 3998e7b77172SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 39991da177e4SLinus Torvalds int i, j, retval; 40001da177e4SLinus Torvalds unsigned delay = HUB_SHORT_RESET_TIME; 40011da177e4SLinus Torvalds enum usb_device_speed oldspeed = udev->speed; 4002e538dfdaSMichal Nazarewicz const char *speed; 40034326ed0bSAlan Stern int devnum = udev->devnum; 40041da177e4SLinus Torvalds 40051da177e4SLinus Torvalds /* root hub ports have a slightly longer reset period 40061da177e4SLinus Torvalds * (from USB 2.0 spec, section 7.1.7.5) 40071da177e4SLinus Torvalds */ 40081da177e4SLinus Torvalds if (!hdev->parent) { 40091da177e4SLinus Torvalds delay = HUB_ROOT_RESET_TIME; 40101da177e4SLinus Torvalds if (port1 == hdev->bus->otg_port) 40111da177e4SLinus Torvalds hdev->bus->b_hnp_enable = 0; 40121da177e4SLinus Torvalds } 40131da177e4SLinus Torvalds 40141da177e4SLinus Torvalds /* Some low speed devices have problems with the quick delay, so */ 40151da177e4SLinus Torvalds /* be a bit pessimistic with those devices. RHbug #23670 */ 40161da177e4SLinus Torvalds if (oldspeed == USB_SPEED_LOW) 40171da177e4SLinus Torvalds delay = HUB_LONG_RESET_TIME; 40181da177e4SLinus Torvalds 40194186ecf8SArjan van de Ven mutex_lock(&usb_address0_mutex); 40201da177e4SLinus Torvalds 40211da177e4SLinus Torvalds /* Reset the device; full speed may morph to high speed */ 4022e7b77172SSarah Sharp /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ 402375d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 40241da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 40251da177e4SLinus Torvalds goto fail; 40261da177e4SLinus Torvalds /* success, speed is known */ 402707194ab7SLuben Tuikov 40281da177e4SLinus Torvalds retval = -ENODEV; 40291da177e4SLinus Torvalds 40301da177e4SLinus Torvalds if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) { 40311da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset changed speed!\n"); 40321da177e4SLinus Torvalds goto fail; 40331da177e4SLinus Torvalds } 40341da177e4SLinus Torvalds oldspeed = udev->speed; 40351da177e4SLinus Torvalds 40361da177e4SLinus Torvalds /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... 40371da177e4SLinus Torvalds * it's fixed size except for full speed devices. 40385bb6e0aeSInaky Perez-Gonzalez * For Wireless USB devices, ep0 max packet is always 512 (tho 40395bb6e0aeSInaky Perez-Gonzalez * reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. 40401da177e4SLinus Torvalds */ 40411da177e4SLinus Torvalds switch (udev->speed) { 40426b403b02SSarah Sharp case USB_SPEED_SUPER: 4043551cdbbeSGreg Kroah-Hartman case USB_SPEED_WIRELESS: /* fixed at 512 */ 4044551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); 40455bb6e0aeSInaky Perez-Gonzalez break; 40461da177e4SLinus Torvalds case USB_SPEED_HIGH: /* fixed at 64 */ 4047551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40481da177e4SLinus Torvalds break; 40491da177e4SLinus Torvalds case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ 40501da177e4SLinus Torvalds /* to determine the ep0 maxpacket size, try to read 40511da177e4SLinus Torvalds * the device descriptor to get bMaxPacketSize0 and 40521da177e4SLinus Torvalds * then correct our initial guess. 40531da177e4SLinus Torvalds */ 4054551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); 40551da177e4SLinus Torvalds break; 40561da177e4SLinus Torvalds case USB_SPEED_LOW: /* fixed at 8 */ 4057551509d2SHarvey Harrison udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); 40581da177e4SLinus Torvalds break; 40591da177e4SLinus Torvalds default: 40601da177e4SLinus Torvalds goto fail; 40611da177e4SLinus Torvalds } 40621da177e4SLinus Torvalds 4063e538dfdaSMichal Nazarewicz if (udev->speed == USB_SPEED_WIRELESS) 4064e538dfdaSMichal Nazarewicz speed = "variable speed Wireless"; 4065e538dfdaSMichal Nazarewicz else 4066e538dfdaSMichal Nazarewicz speed = usb_speed_string(udev->speed); 4067e538dfdaSMichal Nazarewicz 4068c6515272SSarah Sharp if (udev->speed != USB_SPEED_SUPER) 406983a07196SInaky Perez-Gonzalez dev_info(&udev->dev, 4070e538dfdaSMichal Nazarewicz "%s %s USB device number %d using %s\n", 4071e538dfdaSMichal Nazarewicz (udev->config) ? "reset" : "new", speed, 40723b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 40731da177e4SLinus Torvalds 40741da177e4SLinus Torvalds /* Set up TT records, if needed */ 40751da177e4SLinus Torvalds if (hdev->tt) { 40761da177e4SLinus Torvalds udev->tt = hdev->tt; 40771da177e4SLinus Torvalds udev->ttport = hdev->ttport; 40781da177e4SLinus Torvalds } else if (udev->speed != USB_SPEED_HIGH 40791da177e4SLinus Torvalds && hdev->speed == USB_SPEED_HIGH) { 4080d199c96dSAlan Stern if (!hub->tt.hub) { 4081d199c96dSAlan Stern dev_err(&udev->dev, "parent hub has no TT\n"); 4082d199c96dSAlan Stern retval = -EINVAL; 4083d199c96dSAlan Stern goto fail; 4084d199c96dSAlan Stern } 40851da177e4SLinus Torvalds udev->tt = &hub->tt; 40861da177e4SLinus Torvalds udev->ttport = port1; 40871da177e4SLinus Torvalds } 40881da177e4SLinus Torvalds 40891da177e4SLinus Torvalds /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? 40901da177e4SLinus Torvalds * Because device hardware and firmware is sometimes buggy in 40911da177e4SLinus Torvalds * this area, and this is how Linux has done it for ages. 40921da177e4SLinus Torvalds * Change it cautiously. 40931da177e4SLinus Torvalds * 409448fc7dbdSDan Williams * NOTE: If use_new_scheme() is true we will start by issuing 40951da177e4SLinus Torvalds * a 64-byte GET_DESCRIPTOR request. This is what Windows does, 40961da177e4SLinus Torvalds * so it may help with some non-standards-compliant devices. 40971da177e4SLinus Torvalds * Otherwise we start with SET_ADDRESS and then try to read the 40981da177e4SLinus Torvalds * first 8 bytes of the device descriptor to get the ep0 maxpacket 40991da177e4SLinus Torvalds * value. 41001da177e4SLinus Torvalds */ 41011da177e4SLinus Torvalds for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) { 410248fc7dbdSDan Williams bool did_new_scheme = false; 410348fc7dbdSDan Williams 410448fc7dbdSDan Williams if (use_new_scheme(udev, retry_counter)) { 41051da177e4SLinus Torvalds struct usb_device_descriptor *buf; 41061da177e4SLinus Torvalds int r = 0; 41071da177e4SLinus Torvalds 410848fc7dbdSDan Williams did_new_scheme = true; 410948fc7dbdSDan Williams retval = hub_enable_device(udev); 411048fc7dbdSDan Williams if (retval < 0) 411148fc7dbdSDan Williams goto fail; 411248fc7dbdSDan Williams 41131da177e4SLinus Torvalds #define GET_DESCRIPTOR_BUFSIZE 64 41141da177e4SLinus Torvalds buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); 41151da177e4SLinus Torvalds if (!buf) { 41161da177e4SLinus Torvalds retval = -ENOMEM; 41171da177e4SLinus Torvalds continue; 41181da177e4SLinus Torvalds } 41191da177e4SLinus Torvalds 4120b89ee19aSAlan Stern /* Retry on all errors; some devices are flakey. 4121b89ee19aSAlan Stern * 255 is for WUSB devices, we actually need to use 4122b89ee19aSAlan Stern * 512 (WUSB1.0[4.8.1]). 41231da177e4SLinus Torvalds */ 41241da177e4SLinus Torvalds for (j = 0; j < 3; ++j) { 41251da177e4SLinus Torvalds buf->bMaxPacketSize0 = 0; 41261da177e4SLinus Torvalds r = usb_control_msg(udev, usb_rcvaddr0pipe(), 41271da177e4SLinus Torvalds USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, 41281da177e4SLinus Torvalds USB_DT_DEVICE << 8, 0, 41291da177e4SLinus Torvalds buf, GET_DESCRIPTOR_BUFSIZE, 4130fd7c519dSJaroslav Kysela initial_descriptor_timeout); 41311da177e4SLinus Torvalds switch (buf->bMaxPacketSize0) { 41325bb6e0aeSInaky Perez-Gonzalez case 8: case 16: case 32: case 64: case 255: 41331da177e4SLinus Torvalds if (buf->bDescriptorType == 41341da177e4SLinus Torvalds USB_DT_DEVICE) { 41351da177e4SLinus Torvalds r = 0; 41361da177e4SLinus Torvalds break; 41371da177e4SLinus Torvalds } 41381da177e4SLinus Torvalds /* FALL THROUGH */ 41391da177e4SLinus Torvalds default: 41401da177e4SLinus Torvalds if (r == 0) 41411da177e4SLinus Torvalds r = -EPROTO; 41421da177e4SLinus Torvalds break; 41431da177e4SLinus Torvalds } 41441da177e4SLinus Torvalds if (r == 0) 41451da177e4SLinus Torvalds break; 41461da177e4SLinus Torvalds } 41471da177e4SLinus Torvalds udev->descriptor.bMaxPacketSize0 = 41481da177e4SLinus Torvalds buf->bMaxPacketSize0; 41491da177e4SLinus Torvalds kfree(buf); 41501da177e4SLinus Torvalds 415175d7cf72SAndiry Xu retval = hub_port_reset(hub, port1, udev, delay, false); 41521da177e4SLinus Torvalds if (retval < 0) /* error or disconnect */ 41531da177e4SLinus Torvalds goto fail; 41541da177e4SLinus Torvalds if (oldspeed != udev->speed) { 41551da177e4SLinus Torvalds dev_dbg(&udev->dev, 41561da177e4SLinus Torvalds "device reset changed speed!\n"); 41571da177e4SLinus Torvalds retval = -ENODEV; 41581da177e4SLinus Torvalds goto fail; 41591da177e4SLinus Torvalds } 41601da177e4SLinus Torvalds if (r) { 4161e9e88fb7SAlan Stern if (r != -ENODEV) 4162e9e88fb7SAlan Stern dev_err(&udev->dev, "device descriptor read/64, error %d\n", 4163b9cef6c3SWu Fengguang r); 41641da177e4SLinus Torvalds retval = -EMSGSIZE; 41651da177e4SLinus Torvalds continue; 41661da177e4SLinus Torvalds } 41671da177e4SLinus Torvalds #undef GET_DESCRIPTOR_BUFSIZE 41681da177e4SLinus Torvalds } 41691da177e4SLinus Torvalds 41706c529cdcSInaky Perez-Gonzalez /* 41716c529cdcSInaky Perez-Gonzalez * If device is WUSB, we already assigned an 41726c529cdcSInaky Perez-Gonzalez * unauthorized address in the Connect Ack sequence; 41736c529cdcSInaky Perez-Gonzalez * authorization will assign the final address. 41746c529cdcSInaky Perez-Gonzalez */ 41756c529cdcSInaky Perez-Gonzalez if (udev->wusb == 0) { 41761da177e4SLinus Torvalds for (j = 0; j < SET_ADDRESS_TRIES; ++j) { 41774326ed0bSAlan Stern retval = hub_set_address(udev, devnum); 41781da177e4SLinus Torvalds if (retval >= 0) 41791da177e4SLinus Torvalds break; 41801da177e4SLinus Torvalds msleep(200); 41811da177e4SLinus Torvalds } 41821da177e4SLinus Torvalds if (retval < 0) { 4183e9e88fb7SAlan Stern if (retval != -ENODEV) 4184e9e88fb7SAlan Stern dev_err(&udev->dev, "device not accepting address %d, error %d\n", 41854326ed0bSAlan Stern devnum, retval); 41861da177e4SLinus Torvalds goto fail; 41871da177e4SLinus Torvalds } 4188c6515272SSarah Sharp if (udev->speed == USB_SPEED_SUPER) { 4189c6515272SSarah Sharp devnum = udev->devnum; 4190c6515272SSarah Sharp dev_info(&udev->dev, 41913b29b68bSAlan Stern "%s SuperSpeed USB device number %d using %s\n", 4192c6515272SSarah Sharp (udev->config) ? "reset" : "new", 41933b29b68bSAlan Stern devnum, udev->bus->controller->driver->name); 4194c6515272SSarah Sharp } 41951da177e4SLinus Torvalds 41961da177e4SLinus Torvalds /* cope with hardware quirkiness: 41971da177e4SLinus Torvalds * - let SET_ADDRESS settle, some device hardware wants it 41981da177e4SLinus Torvalds * - read ep0 maxpacket even for high and low speed, 41991da177e4SLinus Torvalds */ 42001da177e4SLinus Torvalds msleep(10); 420148fc7dbdSDan Williams /* use_new_scheme() checks the speed which may have 420248fc7dbdSDan Williams * changed since the initial look so we cache the result 420348fc7dbdSDan Williams * in did_new_scheme 420448fc7dbdSDan Williams */ 420548fc7dbdSDan Williams if (did_new_scheme) 42061da177e4SLinus Torvalds break; 42076c529cdcSInaky Perez-Gonzalez } 42081da177e4SLinus Torvalds 42091da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, 8); 42101da177e4SLinus Torvalds if (retval < 8) { 4211e9e88fb7SAlan Stern if (retval != -ENODEV) 4212b9cef6c3SWu Fengguang dev_err(&udev->dev, 4213b9cef6c3SWu Fengguang "device descriptor read/8, error %d\n", 4214b9cef6c3SWu Fengguang retval); 42151da177e4SLinus Torvalds if (retval >= 0) 42161da177e4SLinus Torvalds retval = -EMSGSIZE; 42171da177e4SLinus Torvalds } else { 42181da177e4SLinus Torvalds retval = 0; 42191da177e4SLinus Torvalds break; 42201da177e4SLinus Torvalds } 42211da177e4SLinus Torvalds } 42221da177e4SLinus Torvalds if (retval) 42231da177e4SLinus Torvalds goto fail; 42241da177e4SLinus Torvalds 4225b76baa81SPeter Chen if (hcd->phy && !hdev->parent) 4226ac96511bSPeter Chen usb_phy_notify_connect(hcd->phy, udev->speed); 4227b76baa81SPeter Chen 4228d8aec3dbSElric Fu /* 4229d8aec3dbSElric Fu * Some superspeed devices have finished the link training process 4230d8aec3dbSElric Fu * and attached to a superspeed hub port, but the device descriptor 4231d8aec3dbSElric Fu * got from those devices show they aren't superspeed devices. Warm 4232d8aec3dbSElric Fu * reset the port attached by the devices can fix them. 4233d8aec3dbSElric Fu */ 4234d8aec3dbSElric Fu if ((udev->speed == USB_SPEED_SUPER) && 4235d8aec3dbSElric Fu (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { 4236d8aec3dbSElric Fu dev_err(&udev->dev, "got a wrong device descriptor, " 4237d8aec3dbSElric Fu "warm reset device\n"); 4238d8aec3dbSElric Fu hub_port_reset(hub, port1, udev, 4239d8aec3dbSElric Fu HUB_BH_RESET_TIME, true); 4240d8aec3dbSElric Fu retval = -EINVAL; 4241d8aec3dbSElric Fu goto fail; 4242d8aec3dbSElric Fu } 4243d8aec3dbSElric Fu 42446b403b02SSarah Sharp if (udev->descriptor.bMaxPacketSize0 == 0xff || 42456b403b02SSarah Sharp udev->speed == USB_SPEED_SUPER) 42466b403b02SSarah Sharp i = 512; 42476b403b02SSarah Sharp else 42486b403b02SSarah Sharp i = udev->descriptor.bMaxPacketSize0; 424929cc8897SKuninori Morimoto if (usb_endpoint_maxp(&udev->ep0.desc) != i) { 425056626a72SAlan Stern if (udev->speed == USB_SPEED_LOW || 42511da177e4SLinus Torvalds !(i == 8 || i == 16 || i == 32 || i == 64)) { 425256626a72SAlan Stern dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); 42531da177e4SLinus Torvalds retval = -EMSGSIZE; 42541da177e4SLinus Torvalds goto fail; 42551da177e4SLinus Torvalds } 425656626a72SAlan Stern if (udev->speed == USB_SPEED_FULL) 42571da177e4SLinus Torvalds dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); 425856626a72SAlan Stern else 425956626a72SAlan Stern dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); 42601da177e4SLinus Torvalds udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); 4261fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 42621da177e4SLinus Torvalds } 42631da177e4SLinus Torvalds 42641da177e4SLinus Torvalds retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); 42651da177e4SLinus Torvalds if (retval < (signed)sizeof(udev->descriptor)) { 4266e9e88fb7SAlan Stern if (retval != -ENODEV) 4267b9cef6c3SWu Fengguang dev_err(&udev->dev, "device descriptor read/all, error %d\n", 4268b9cef6c3SWu Fengguang retval); 42691da177e4SLinus Torvalds if (retval >= 0) 42701da177e4SLinus Torvalds retval = -ENOMSG; 42711da177e4SLinus Torvalds goto fail; 42721da177e4SLinus Torvalds } 42731da177e4SLinus Torvalds 42741ff4df56SAndiry Xu if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { 42751ff4df56SAndiry Xu retval = usb_get_bos_descriptor(udev); 427651e0a012SSarah Sharp if (!retval) { 4277d9b2099cSSarah Sharp udev->lpm_capable = usb_device_supports_lpm(udev); 427851e0a012SSarah Sharp usb_set_lpm_parameters(udev); 427951e0a012SSarah Sharp } 42801ff4df56SAndiry Xu } 42813148bf04SAndiry Xu 42821da177e4SLinus Torvalds retval = 0; 428348f24970SAlek Du /* notify HCD that we have a device connected and addressed */ 428448f24970SAlek Du if (hcd->driver->update_device) 428548f24970SAlek Du hcd->driver->update_device(hcd, udev); 4286890dae88SMathias Nyman hub_set_initial_usb2_lpm_policy(udev); 42871da177e4SLinus Torvalds fail: 42884326ed0bSAlan Stern if (retval) { 42891da177e4SLinus Torvalds hub_port_disable(hub, port1, 0); 42903b29b68bSAlan Stern update_devnum(udev, devnum); /* for disconnect processing */ 42914326ed0bSAlan Stern } 42924186ecf8SArjan van de Ven mutex_unlock(&usb_address0_mutex); 42931da177e4SLinus Torvalds return retval; 42941da177e4SLinus Torvalds } 42951da177e4SLinus Torvalds 42961da177e4SLinus Torvalds static void 42971da177e4SLinus Torvalds check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1) 42981da177e4SLinus Torvalds { 42991da177e4SLinus Torvalds struct usb_qualifier_descriptor *qual; 43001da177e4SLinus Torvalds int status; 43011da177e4SLinus Torvalds 4302e94b1766SChristoph Lameter qual = kmalloc (sizeof *qual, GFP_KERNEL); 43031da177e4SLinus Torvalds if (qual == NULL) 43041da177e4SLinus Torvalds return; 43051da177e4SLinus Torvalds 43061da177e4SLinus Torvalds status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0, 43071da177e4SLinus Torvalds qual, sizeof *qual); 43081da177e4SLinus Torvalds if (status == sizeof *qual) { 43091da177e4SLinus Torvalds dev_info(&udev->dev, "not running at top speed; " 43101da177e4SLinus Torvalds "connect to a high speed hub\n"); 43111da177e4SLinus Torvalds /* hub LEDs are probably harder to miss than syslog */ 43121da177e4SLinus Torvalds if (hub->has_indicators) { 43131da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; 4314c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 43151da177e4SLinus Torvalds } 43161da177e4SLinus Torvalds } 43171da177e4SLinus Torvalds kfree(qual); 43181da177e4SLinus Torvalds } 43191da177e4SLinus Torvalds 43201da177e4SLinus Torvalds static unsigned 43211da177e4SLinus Torvalds hub_power_remaining (struct usb_hub *hub) 43221da177e4SLinus Torvalds { 43231da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 43241da177e4SLinus Torvalds int remaining; 432555c52718SAlan Stern int port1; 43261da177e4SLinus Torvalds 432755c52718SAlan Stern if (!hub->limited_power) 43281da177e4SLinus Torvalds return 0; 43291da177e4SLinus Torvalds 433055c52718SAlan Stern remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; 433155c52718SAlan Stern for (port1 = 1; port1 <= hdev->maxchild; ++port1) { 4332ff823c79SLan Tianyu struct usb_device *udev = hub->ports[port1 - 1]->child; 433355c52718SAlan Stern int delta; 4334430ee58eSSebastian Andrzej Siewior unsigned unit_load; 43351da177e4SLinus Torvalds 43361da177e4SLinus Torvalds if (!udev) 43371da177e4SLinus Torvalds continue; 4338430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(udev)) 4339430ee58eSSebastian Andrzej Siewior unit_load = 150; 4340430ee58eSSebastian Andrzej Siewior else 4341430ee58eSSebastian Andrzej Siewior unit_load = 100; 43421da177e4SLinus Torvalds 4343430ee58eSSebastian Andrzej Siewior /* 4344430ee58eSSebastian Andrzej Siewior * Unconfigured devices may not use more than one unit load, 4345430ee58eSSebastian Andrzej Siewior * or 8mA for OTG ports 4346430ee58eSSebastian Andrzej Siewior */ 43471da177e4SLinus Torvalds if (udev->actconfig) 43488d8479dbSSebastian Andrzej Siewior delta = usb_get_max_power(udev, udev->actconfig); 434955c52718SAlan Stern else if (port1 != udev->bus->otg_port || hdev->parent) 4350430ee58eSSebastian Andrzej Siewior delta = unit_load; 43511da177e4SLinus Torvalds else 435255c52718SAlan Stern delta = 8; 435355c52718SAlan Stern if (delta > hub->mA_per_port) 4354b9cef6c3SWu Fengguang dev_warn(&udev->dev, 4355b9cef6c3SWu Fengguang "%dmA is over %umA budget for port %d!\n", 435655c52718SAlan Stern delta, hub->mA_per_port, port1); 43571da177e4SLinus Torvalds remaining -= delta; 43581da177e4SLinus Torvalds } 43591da177e4SLinus Torvalds if (remaining < 0) { 436055c52718SAlan Stern dev_warn(hub->intfdev, "%dmA over power budget!\n", 436155c52718SAlan Stern -remaining); 43621da177e4SLinus Torvalds remaining = 0; 43631da177e4SLinus Torvalds } 43641da177e4SLinus Torvalds return remaining; 43651da177e4SLinus Torvalds } 43661da177e4SLinus Torvalds 43671da177e4SLinus Torvalds /* Handle physical or logical connection change events. 43681da177e4SLinus Torvalds * This routine is called when: 43691da177e4SLinus Torvalds * a port connection-change occurs; 43701da177e4SLinus Torvalds * a port enable-change occurs (often caused by EMI); 4371742120c6SMing Lei * usb_reset_and_verify_device() encounters changed descriptors (as from 43721da177e4SLinus Torvalds * a firmware download) 43731da177e4SLinus Torvalds * caller already locked the hub 43741da177e4SLinus Torvalds */ 43751da177e4SLinus Torvalds static void hub_port_connect_change(struct usb_hub *hub, int port1, 43761da177e4SLinus Torvalds u16 portstatus, u16 portchange) 43771da177e4SLinus Torvalds { 43781da177e4SLinus Torvalds struct usb_device *hdev = hub->hdev; 43791da177e4SLinus Torvalds struct device *hub_dev = hub->intfdev; 438090da096eSBalaji Rao struct usb_hcd *hcd = bus_to_hcd(hdev->bus); 438124618b0cSAlan Stern unsigned wHubCharacteristics = 438224618b0cSAlan Stern le16_to_cpu(hub->descriptor->wHubCharacteristics); 43838808f00cSAlan Stern struct usb_device *udev; 43841da177e4SLinus Torvalds int status, i; 4385430ee58eSSebastian Andrzej Siewior unsigned unit_load; 43861da177e4SLinus Torvalds 43871da177e4SLinus Torvalds dev_dbg (hub_dev, 43881da177e4SLinus Torvalds "port %d, status %04x, change %04x, %s\n", 4389131dec34SSarah Sharp port1, portstatus, portchange, portspeed(hub, portstatus)); 43901da177e4SLinus Torvalds 43911da177e4SLinus Torvalds if (hub->has_indicators) { 43921da177e4SLinus Torvalds set_port_led(hub, port1, HUB_LED_AUTO); 43931da177e4SLinus Torvalds hub->indicator[port1-1] = INDICATOR_AUTO; 43941da177e4SLinus Torvalds } 43951da177e4SLinus Torvalds 43961da177e4SLinus Torvalds #ifdef CONFIG_USB_OTG 43971da177e4SLinus Torvalds /* during HNP, don't repeat the debounce */ 43981da177e4SLinus Torvalds if (hdev->bus->is_b_host) 439924618b0cSAlan Stern portchange &= ~(USB_PORT_STAT_C_CONNECTION | 440024618b0cSAlan Stern USB_PORT_STAT_C_ENABLE); 44011da177e4SLinus Torvalds #endif 44021da177e4SLinus Torvalds 44038808f00cSAlan Stern /* Try to resuscitate an existing device */ 4404ff823c79SLan Tianyu udev = hub->ports[port1 - 1]->child; 44058808f00cSAlan Stern if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && 44068808f00cSAlan Stern udev->state != USB_STATE_NOTATTACHED) { 44078808f00cSAlan Stern usb_lock_device(udev); 44088808f00cSAlan Stern if (portstatus & USB_PORT_STAT_ENABLE) { 44098808f00cSAlan Stern status = 0; /* Nothing to do */ 44108808f00cSAlan Stern 441184ebc102SAlan Stern #ifdef CONFIG_PM_RUNTIME 44125257d97aSAlan Stern } else if (udev->state == USB_STATE_SUSPENDED && 44135257d97aSAlan Stern udev->persist_enabled) { 44148808f00cSAlan Stern /* For a suspended device, treat this as a 44158808f00cSAlan Stern * remote wakeup event. 44168808f00cSAlan Stern */ 44170534d468SAlan Stern status = usb_remote_wakeup(udev); 44188808f00cSAlan Stern #endif 44198808f00cSAlan Stern 44208808f00cSAlan Stern } else { 44215257d97aSAlan Stern status = -ENODEV; /* Don't resuscitate */ 44228808f00cSAlan Stern } 44238808f00cSAlan Stern usb_unlock_device(udev); 44248808f00cSAlan Stern 44258808f00cSAlan Stern if (status == 0) { 44268808f00cSAlan Stern clear_bit(port1, hub->change_bits); 44278808f00cSAlan Stern return; 44288808f00cSAlan Stern } 44298808f00cSAlan Stern } 44308808f00cSAlan Stern 443124618b0cSAlan Stern /* Disconnect any existing devices under this port */ 4432b76baa81SPeter Chen if (udev) { 4433b76baa81SPeter Chen if (hcd->phy && !hdev->parent && 4434b76baa81SPeter Chen !(portstatus & USB_PORT_STAT_CONNECTION)) 4435ac96511bSPeter Chen usb_phy_notify_disconnect(hcd->phy, udev->speed); 4436ff823c79SLan Tianyu usb_disconnect(&hub->ports[port1 - 1]->child); 4437b76baa81SPeter Chen } 443824618b0cSAlan Stern clear_bit(port1, hub->change_bits); 443924618b0cSAlan Stern 4440253e0572SAlan Stern /* We can forget about a "removed" device when there's a physical 4441253e0572SAlan Stern * disconnect or the connect status changes. 4442253e0572SAlan Stern */ 4443253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4444253e0572SAlan Stern (portchange & USB_PORT_STAT_C_CONNECTION)) 4445253e0572SAlan Stern clear_bit(port1, hub->removed_bits); 4446253e0572SAlan Stern 44475257d97aSAlan Stern if (portchange & (USB_PORT_STAT_C_CONNECTION | 44485257d97aSAlan Stern USB_PORT_STAT_C_ENABLE)) { 4449ad493e5eSLan Tianyu status = hub_port_debounce_be_stable(hub, port1); 44505257d97aSAlan Stern if (status < 0) { 4451e9e88fb7SAlan Stern if (status != -ENODEV && printk_ratelimit()) 44525257d97aSAlan Stern dev_err(hub_dev, "connect-debounce failed, " 44535257d97aSAlan Stern "port %d disabled\n", port1); 44545257d97aSAlan Stern portstatus &= ~USB_PORT_STAT_CONNECTION; 44555257d97aSAlan Stern } else { 44565257d97aSAlan Stern portstatus = status; 44575257d97aSAlan Stern } 44585257d97aSAlan Stern } 44595257d97aSAlan Stern 4460253e0572SAlan Stern /* Return now if debouncing failed or nothing is connected or 4461253e0572SAlan Stern * the device was "removed". 4462253e0572SAlan Stern */ 4463253e0572SAlan Stern if (!(portstatus & USB_PORT_STAT_CONNECTION) || 4464253e0572SAlan Stern test_bit(port1, hub->removed_bits)) { 44651da177e4SLinus Torvalds 44661da177e4SLinus Torvalds /* maybe switch power back on (e.g. root hub was reset) */ 446774ad9bd2SGreg Kroah-Hartman if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2 44680ed9a57eSAndiry Xu && !port_is_power_on(hub, portstatus)) 44691da177e4SLinus Torvalds set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); 44701da177e4SLinus Torvalds 44711da177e4SLinus Torvalds if (portstatus & USB_PORT_STAT_ENABLE) 44721da177e4SLinus Torvalds goto done; 44731da177e4SLinus Torvalds return; 44741da177e4SLinus Torvalds } 4475430ee58eSSebastian Andrzej Siewior if (hub_is_superspeed(hub->hdev)) 4476430ee58eSSebastian Andrzej Siewior unit_load = 150; 4477430ee58eSSebastian Andrzej Siewior else 4478430ee58eSSebastian Andrzej Siewior unit_load = 100; 44791da177e4SLinus Torvalds 4480e9e88fb7SAlan Stern status = 0; 44811da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; i++) { 44821da177e4SLinus Torvalds 44831da177e4SLinus Torvalds /* reallocate for each attempt, since references 44841da177e4SLinus Torvalds * to the previous one can escape in various ways 44851da177e4SLinus Torvalds */ 44861da177e4SLinus Torvalds udev = usb_alloc_dev(hdev, hdev->bus, port1); 44871da177e4SLinus Torvalds if (!udev) { 44881da177e4SLinus Torvalds dev_err (hub_dev, 44891da177e4SLinus Torvalds "couldn't allocate port %d usb_device\n", 44901da177e4SLinus Torvalds port1); 44911da177e4SLinus Torvalds goto done; 44921da177e4SLinus Torvalds } 44931da177e4SLinus Torvalds 44941da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_POWERED); 449555c52718SAlan Stern udev->bus_mA = hub->mA_per_port; 4496b6956ffaSAlan Stern udev->level = hdev->level + 1; 44978af548dcSInaky Perez-Gonzalez udev->wusb = hub_is_wusb(hub); 44981da177e4SLinus Torvalds 4499131dec34SSarah Sharp /* Only USB 3.0 devices are connected to SuperSpeed hubs. */ 4500131dec34SSarah Sharp if (hub_is_superspeed(hub->hdev)) 4501e7b77172SSarah Sharp udev->speed = USB_SPEED_SUPER; 4502e7b77172SSarah Sharp else 4503e7b77172SSarah Sharp udev->speed = USB_SPEED_UNKNOWN; 4504e7b77172SSarah Sharp 45053b29b68bSAlan Stern choose_devnum(udev); 4506c6515272SSarah Sharp if (udev->devnum <= 0) { 4507c6515272SSarah Sharp status = -ENOTCONN; /* Don't retry */ 4508c6515272SSarah Sharp goto loop; 4509c6515272SSarah Sharp } 4510c6515272SSarah Sharp 4511e7b77172SSarah Sharp /* reset (non-USB 3.0 devices) and get descriptor */ 45121da177e4SLinus Torvalds status = hub_port_init(hub, udev, port1, i); 45131da177e4SLinus Torvalds if (status < 0) 45141da177e4SLinus Torvalds goto loop; 45151da177e4SLinus Torvalds 451693362a87SPhil Dibowitz usb_detect_quirks(udev); 451793362a87SPhil Dibowitz if (udev->quirks & USB_QUIRK_DELAY_INIT) 451893362a87SPhil Dibowitz msleep(1000); 451993362a87SPhil Dibowitz 45201da177e4SLinus Torvalds /* consecutive bus-powered hubs aren't reliable; they can 45211da177e4SLinus Torvalds * violate the voltage drop budget. if the new child has 45221da177e4SLinus Torvalds * a "powered" LED, users should notice we didn't enable it 45231da177e4SLinus Torvalds * (without reading syslog), even without per-port LEDs 45241da177e4SLinus Torvalds * on the parent. 45251da177e4SLinus Torvalds */ 45261da177e4SLinus Torvalds if (udev->descriptor.bDeviceClass == USB_CLASS_HUB 4527430ee58eSSebastian Andrzej Siewior && udev->bus_mA <= unit_load) { 45281da177e4SLinus Torvalds u16 devstat; 45291da177e4SLinus Torvalds 45301da177e4SLinus Torvalds status = usb_get_status(udev, USB_RECIP_DEVICE, 0, 45311da177e4SLinus Torvalds &devstat); 453215b7336eSAlan Stern if (status) { 45331da177e4SLinus Torvalds dev_dbg(&udev->dev, "get status %d ?\n", status); 45341da177e4SLinus Torvalds goto loop_disable; 45351da177e4SLinus Torvalds } 45361da177e4SLinus Torvalds if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { 45371da177e4SLinus Torvalds dev_err(&udev->dev, 45381da177e4SLinus Torvalds "can't connect bus-powered hub " 45391da177e4SLinus Torvalds "to this port\n"); 45401da177e4SLinus Torvalds if (hub->has_indicators) { 45411da177e4SLinus Torvalds hub->indicator[port1-1] = 45421da177e4SLinus Torvalds INDICATOR_AMBER_BLINK; 4543c4028958SDavid Howells schedule_delayed_work (&hub->leds, 0); 45441da177e4SLinus Torvalds } 45451da177e4SLinus Torvalds status = -ENOTCONN; /* Don't retry */ 45461da177e4SLinus Torvalds goto loop_disable; 45471da177e4SLinus Torvalds } 45481da177e4SLinus Torvalds } 45491da177e4SLinus Torvalds 45501da177e4SLinus Torvalds /* check for devices running slower than they could */ 45511da177e4SLinus Torvalds if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 45521da177e4SLinus Torvalds && udev->speed == USB_SPEED_FULL 45531da177e4SLinus Torvalds && highspeed_hubs != 0) 45541da177e4SLinus Torvalds check_highspeed (hub, udev, port1); 45551da177e4SLinus Torvalds 4556fa286188SGreg Kroah-Hartman /* Store the parent's children[] pointer. At this point 45571da177e4SLinus Torvalds * udev becomes globally accessible, although presumably 45581da177e4SLinus Torvalds * no one will look at it until hdev is unlocked. 45591da177e4SLinus Torvalds */ 45601da177e4SLinus Torvalds status = 0; 45611da177e4SLinus Torvalds 45621da177e4SLinus Torvalds /* We mustn't add new devices if the parent hub has 45631da177e4SLinus Torvalds * been disconnected; we would race with the 45641da177e4SLinus Torvalds * recursively_mark_NOTATTACHED() routine. 45651da177e4SLinus Torvalds */ 45661da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 45671da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) 45681da177e4SLinus Torvalds status = -ENOTCONN; 45691da177e4SLinus Torvalds else 4570ff823c79SLan Tianyu hub->ports[port1 - 1]->child = udev; 45711da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 45721da177e4SLinus Torvalds 45731da177e4SLinus Torvalds /* Run it through the hoops (find a driver, etc) */ 45741da177e4SLinus Torvalds if (!status) { 45751da177e4SLinus Torvalds status = usb_new_device(udev); 45761da177e4SLinus Torvalds if (status) { 45771da177e4SLinus Torvalds spin_lock_irq(&device_state_lock); 4578ff823c79SLan Tianyu hub->ports[port1 - 1]->child = NULL; 45791da177e4SLinus Torvalds spin_unlock_irq(&device_state_lock); 45801da177e4SLinus Torvalds } 45811da177e4SLinus Torvalds } 45821da177e4SLinus Torvalds 45831da177e4SLinus Torvalds if (status) 45841da177e4SLinus Torvalds goto loop_disable; 45851da177e4SLinus Torvalds 45861da177e4SLinus Torvalds status = hub_power_remaining(hub); 45871da177e4SLinus Torvalds if (status) 458855c52718SAlan Stern dev_dbg(hub_dev, "%dmA power budget left\n", status); 45891da177e4SLinus Torvalds 45901da177e4SLinus Torvalds return; 45911da177e4SLinus Torvalds 45921da177e4SLinus Torvalds loop_disable: 45931da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 45941da177e4SLinus Torvalds loop: 4595fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 45963b29b68bSAlan Stern release_devnum(udev); 4597f7410cedSHerbert Xu hub_free_dev(udev); 45981da177e4SLinus Torvalds usb_put_dev(udev); 4599ffcdc18dSVikram Pandita if ((status == -ENOTCONN) || (status == -ENOTSUPP)) 46001da177e4SLinus Torvalds break; 46011da177e4SLinus Torvalds } 46023a31155cSAlan Stern if (hub->hdev->parent || 46033a31155cSAlan Stern !hcd->driver->port_handed_over || 4604e9e88fb7SAlan Stern !(hcd->driver->port_handed_over)(hcd, port1)) { 4605e9e88fb7SAlan Stern if (status != -ENOTCONN && status != -ENODEV) 46063a31155cSAlan Stern dev_err(hub_dev, "unable to enumerate USB device on port %d\n", 46073a31155cSAlan Stern port1); 4608e9e88fb7SAlan Stern } 46091da177e4SLinus Torvalds 46101da177e4SLinus Torvalds done: 46111da177e4SLinus Torvalds hub_port_disable(hub, port1, 1); 461290da096eSBalaji Rao if (hcd->driver->relinquish_port && !hub->hdev->parent) 461390da096eSBalaji Rao hcd->driver->relinquish_port(hcd, port1); 46141da177e4SLinus Torvalds } 46151da177e4SLinus Torvalds 4616714b07beSSarah Sharp /* Returns 1 if there was a remote wakeup and a connect status change. */ 4617714b07beSSarah Sharp static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, 461872937e1eSSarah Sharp u16 portstatus, u16 portchange) 4619714b07beSSarah Sharp { 4620714b07beSSarah Sharp struct usb_device *hdev; 4621714b07beSSarah Sharp struct usb_device *udev; 4622714b07beSSarah Sharp int connect_change = 0; 4623714b07beSSarah Sharp int ret; 4624714b07beSSarah Sharp 4625714b07beSSarah Sharp hdev = hub->hdev; 4626ff823c79SLan Tianyu udev = hub->ports[port - 1]->child; 46274ee823b8SSarah Sharp if (!hub_is_superspeed(hdev)) { 4628714b07beSSarah Sharp if (!(portchange & USB_PORT_STAT_C_SUSPEND)) 4629714b07beSSarah Sharp return 0; 4630ad493e5eSLan Tianyu usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); 46314ee823b8SSarah Sharp } else { 46324ee823b8SSarah Sharp if (!udev || udev->state != USB_STATE_SUSPENDED || 463372937e1eSSarah Sharp (portstatus & USB_PORT_STAT_LINK_STATE) != 463472937e1eSSarah Sharp USB_SS_PORT_LS_U0) 46354ee823b8SSarah Sharp return 0; 46364ee823b8SSarah Sharp } 4637714b07beSSarah Sharp 4638714b07beSSarah Sharp if (udev) { 4639714b07beSSarah Sharp /* TRSMRCY = 10 msec */ 4640714b07beSSarah Sharp msleep(10); 4641714b07beSSarah Sharp 4642714b07beSSarah Sharp usb_lock_device(udev); 4643714b07beSSarah Sharp ret = usb_remote_wakeup(udev); 4644714b07beSSarah Sharp usb_unlock_device(udev); 4645714b07beSSarah Sharp if (ret < 0) 4646714b07beSSarah Sharp connect_change = 1; 4647714b07beSSarah Sharp } else { 4648714b07beSSarah Sharp ret = -ENODEV; 4649714b07beSSarah Sharp hub_port_disable(hub, port, 1); 4650714b07beSSarah Sharp } 4651714b07beSSarah Sharp dev_dbg(hub->intfdev, "resume on port %d, status %d\n", 4652714b07beSSarah Sharp port, ret); 4653714b07beSSarah Sharp return connect_change; 4654714b07beSSarah Sharp } 4655714b07beSSarah Sharp 46561da177e4SLinus Torvalds static void hub_events(void) 46571da177e4SLinus Torvalds { 46581da177e4SLinus Torvalds struct list_head *tmp; 46591da177e4SLinus Torvalds struct usb_device *hdev; 46601da177e4SLinus Torvalds struct usb_interface *intf; 46611da177e4SLinus Torvalds struct usb_hub *hub; 46621da177e4SLinus Torvalds struct device *hub_dev; 46631da177e4SLinus Torvalds u16 hubstatus; 46641da177e4SLinus Torvalds u16 hubchange; 46651da177e4SLinus Torvalds u16 portstatus; 46661da177e4SLinus Torvalds u16 portchange; 46671da177e4SLinus Torvalds int i, ret; 46684ee823b8SSarah Sharp int connect_change, wakeup_change; 46691da177e4SLinus Torvalds 46701da177e4SLinus Torvalds /* 46711da177e4SLinus Torvalds * We restart the list every time to avoid a deadlock with 46721da177e4SLinus Torvalds * deleting hubs downstream from this one. This should be 46731da177e4SLinus Torvalds * safe since we delete the hub from the event list. 46741da177e4SLinus Torvalds * Not the most efficient, but avoids deadlocks. 46751da177e4SLinus Torvalds */ 46761da177e4SLinus Torvalds while (1) { 46771da177e4SLinus Torvalds 46781da177e4SLinus Torvalds /* Grab the first entry at the beginning of the list */ 46791da177e4SLinus Torvalds spin_lock_irq(&hub_event_lock); 46801da177e4SLinus Torvalds if (list_empty(&hub_event_list)) { 46811da177e4SLinus Torvalds spin_unlock_irq(&hub_event_lock); 46821da177e4SLinus Torvalds break; 46831da177e4SLinus Torvalds } 46841da177e4SLinus Torvalds 46851da177e4SLinus Torvalds tmp = hub_event_list.next; 46861da177e4SLinus Torvalds list_del_init(tmp); 46871da177e4SLinus Torvalds 46881da177e4SLinus Torvalds hub = list_entry(tmp, struct usb_hub, event_list); 4689e8054854SAlan Stern kref_get(&hub->kref); 4690e8054854SAlan Stern spin_unlock_irq(&hub_event_lock); 46911da177e4SLinus Torvalds 4692e8054854SAlan Stern hdev = hub->hdev; 4693e8054854SAlan Stern hub_dev = hub->intfdev; 4694e8054854SAlan Stern intf = to_usb_interface(hub_dev); 469540f122f3SAlan Stern dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", 46963bbc47d8SKrzysztof Mazur hdev->state, hdev->maxchild, 46971da177e4SLinus Torvalds /* NOTE: expects max 15 ports... */ 46981da177e4SLinus Torvalds (u16) hub->change_bits[0], 469940f122f3SAlan Stern (u16) hub->event_bits[0]); 47001da177e4SLinus Torvalds 47011da177e4SLinus Torvalds /* Lock the device, then check to see if we were 47021da177e4SLinus Torvalds * disconnected while waiting for the lock to succeed. */ 470306b84e8aSAlan Stern usb_lock_device(hdev); 4704e8054854SAlan Stern if (unlikely(hub->disconnected)) 47059bbdf1e0SAlan Stern goto loop_disconnected; 47061da177e4SLinus Torvalds 47071da177e4SLinus Torvalds /* If the hub has died, clean up after it */ 47081da177e4SLinus Torvalds if (hdev->state == USB_STATE_NOTATTACHED) { 47097de18d8bSAlan Stern hub->error = -ENODEV; 47104330354fSAlan Stern hub_quiesce(hub, HUB_DISCONNECT); 47111da177e4SLinus Torvalds goto loop; 47121da177e4SLinus Torvalds } 47131da177e4SLinus Torvalds 471440f122f3SAlan Stern /* Autoresume */ 471540f122f3SAlan Stern ret = usb_autopm_get_interface(intf); 471640f122f3SAlan Stern if (ret) { 471740f122f3SAlan Stern dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); 47181da177e4SLinus Torvalds goto loop; 471940f122f3SAlan Stern } 472040f122f3SAlan Stern 472140f122f3SAlan Stern /* If this is an inactive hub, do nothing */ 472240f122f3SAlan Stern if (hub->quiescing) 472340f122f3SAlan Stern goto loop_autopm; 47241da177e4SLinus Torvalds 47251da177e4SLinus Torvalds if (hub->error) { 47261da177e4SLinus Torvalds dev_dbg (hub_dev, "resetting for error %d\n", 47271da177e4SLinus Torvalds hub->error); 47281da177e4SLinus Torvalds 4729742120c6SMing Lei ret = usb_reset_device(hdev); 47301da177e4SLinus Torvalds if (ret) { 47311da177e4SLinus Torvalds dev_dbg (hub_dev, 47321da177e4SLinus Torvalds "error resetting hub: %d\n", ret); 473340f122f3SAlan Stern goto loop_autopm; 47341da177e4SLinus Torvalds } 47351da177e4SLinus Torvalds 47361da177e4SLinus Torvalds hub->nerrors = 0; 47371da177e4SLinus Torvalds hub->error = 0; 47381da177e4SLinus Torvalds } 47391da177e4SLinus Torvalds 47401da177e4SLinus Torvalds /* deal with port status changes */ 47413bbc47d8SKrzysztof Mazur for (i = 1; i <= hdev->maxchild; i++) { 47421da177e4SLinus Torvalds if (test_bit(i, hub->busy_bits)) 47431da177e4SLinus Torvalds continue; 47441da177e4SLinus Torvalds connect_change = test_bit(i, hub->change_bits); 474572937e1eSSarah Sharp wakeup_change = test_and_clear_bit(i, hub->wakeup_bits); 47461da177e4SLinus Torvalds if (!test_and_clear_bit(i, hub->event_bits) && 47474ee823b8SSarah Sharp !connect_change && !wakeup_change) 47481da177e4SLinus Torvalds continue; 47491da177e4SLinus Torvalds 47501da177e4SLinus Torvalds ret = hub_port_status(hub, i, 47511da177e4SLinus Torvalds &portstatus, &portchange); 47521da177e4SLinus Torvalds if (ret < 0) 47531da177e4SLinus Torvalds continue; 47541da177e4SLinus Torvalds 47551da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_CONNECTION) { 4756ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47571da177e4SLinus Torvalds USB_PORT_FEAT_C_CONNECTION); 47581da177e4SLinus Torvalds connect_change = 1; 47591da177e4SLinus Torvalds } 47601da177e4SLinus Torvalds 47611da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_ENABLE) { 47621da177e4SLinus Torvalds if (!connect_change) 47631da177e4SLinus Torvalds dev_dbg (hub_dev, 47641da177e4SLinus Torvalds "port %d enable change, " 47651da177e4SLinus Torvalds "status %08x\n", 47661da177e4SLinus Torvalds i, portstatus); 4767ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47681da177e4SLinus Torvalds USB_PORT_FEAT_C_ENABLE); 47691da177e4SLinus Torvalds 47701da177e4SLinus Torvalds /* 47711da177e4SLinus Torvalds * EM interference sometimes causes badly 47721da177e4SLinus Torvalds * shielded USB devices to be shutdown by 47731da177e4SLinus Torvalds * the hub, this hack enables them again. 47741da177e4SLinus Torvalds * Works at least with mouse driver. 47751da177e4SLinus Torvalds */ 47761da177e4SLinus Torvalds if (!(portstatus & USB_PORT_STAT_ENABLE) 47771da177e4SLinus Torvalds && !connect_change 4778ff823c79SLan Tianyu && hub->ports[i - 1]->child) { 47791da177e4SLinus Torvalds dev_err (hub_dev, 47801da177e4SLinus Torvalds "port %i " 47811da177e4SLinus Torvalds "disabled by hub (EMI?), " 47821da177e4SLinus Torvalds "re-enabling...\n", 47831da177e4SLinus Torvalds i); 47841da177e4SLinus Torvalds connect_change = 1; 47851da177e4SLinus Torvalds } 47861da177e4SLinus Torvalds } 47871da177e4SLinus Torvalds 478872937e1eSSarah Sharp if (hub_handle_remote_wakeup(hub, i, 478972937e1eSSarah Sharp portstatus, portchange)) 47901da177e4SLinus Torvalds connect_change = 1; 47911da177e4SLinus Torvalds 47921da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_OVERCURRENT) { 4793752d57a8SPaul Bolle u16 status = 0; 4794752d57a8SPaul Bolle u16 unused; 4795752d57a8SPaul Bolle 4796752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change on port " 4797752d57a8SPaul Bolle "%d\n", i); 4798ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 47991da177e4SLinus Torvalds USB_PORT_FEAT_C_OVER_CURRENT); 4800752d57a8SPaul Bolle msleep(100); /* Cool down */ 48018520f380SAlan Stern hub_power_on(hub, true); 4802752d57a8SPaul Bolle hub_port_status(hub, i, &status, &unused); 4803752d57a8SPaul Bolle if (status & USB_PORT_STAT_OVERCURRENT) 4804752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4805752d57a8SPaul Bolle "condition on port %d\n", i); 48061da177e4SLinus Torvalds } 48071da177e4SLinus Torvalds 48081da177e4SLinus Torvalds if (portchange & USB_PORT_STAT_C_RESET) { 48091da177e4SLinus Torvalds dev_dbg (hub_dev, 48101da177e4SLinus Torvalds "reset change on port %d\n", 48111da177e4SLinus Torvalds i); 4812ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 48131da177e4SLinus Torvalds USB_PORT_FEAT_C_RESET); 48141da177e4SLinus Torvalds } 4815c7061574SSarah Sharp if ((portchange & USB_PORT_STAT_C_BH_RESET) && 4816c7061574SSarah Sharp hub_is_superspeed(hub->hdev)) { 4817c7061574SSarah Sharp dev_dbg(hub_dev, 4818c7061574SSarah Sharp "warm reset change on port %d\n", 4819c7061574SSarah Sharp i); 4820ad493e5eSLan Tianyu usb_clear_port_feature(hdev, i, 4821c7061574SSarah Sharp USB_PORT_FEAT_C_BH_PORT_RESET); 4822c7061574SSarah Sharp } 4823dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_LINK_STATE) { 4824ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4825dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_LINK_STATE); 4826dbe79bbeSJohn Youn } 4827dbe79bbeSJohn Youn if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { 4828dbe79bbeSJohn Youn dev_warn(hub_dev, 4829dbe79bbeSJohn Youn "config error on port %d\n", 4830dbe79bbeSJohn Youn i); 4831ad493e5eSLan Tianyu usb_clear_port_feature(hub->hdev, i, 4832dbe79bbeSJohn Youn USB_PORT_FEAT_C_PORT_CONFIG_ERROR); 4833dbe79bbeSJohn Youn } 48341da177e4SLinus Torvalds 48355e467f6eSAndiry Xu /* Warm reset a USB3 protocol port if it's in 48365e467f6eSAndiry Xu * SS.Inactive state. 48375e467f6eSAndiry Xu */ 48388bea2bd3SStanislaw Ledwon if (hub_port_warm_reset_required(hub, portstatus)) { 483965bdac5eSSarah Sharp int status; 4840d3b9d7a9SSarah Sharp struct usb_device *udev = 4841d3b9d7a9SSarah Sharp hub->ports[i - 1]->child; 484265bdac5eSSarah Sharp 48435e467f6eSAndiry Xu dev_dbg(hub_dev, "warm reset port %d\n", i); 48442d51f3cdSJulius Werner if (!udev || 48452d51f3cdSJulius Werner !(portstatus & USB_PORT_STAT_CONNECTION) || 48462d51f3cdSJulius Werner udev->state == USB_STATE_NOTATTACHED) { 4847d3b9d7a9SSarah Sharp status = hub_port_reset(hub, i, 4848d3b9d7a9SSarah Sharp NULL, HUB_BH_RESET_TIME, 4849d3b9d7a9SSarah Sharp true); 485065bdac5eSSarah Sharp if (status < 0) 485165bdac5eSSarah Sharp hub_port_disable(hub, i, 1); 4852d3b9d7a9SSarah Sharp } else { 4853d3b9d7a9SSarah Sharp usb_lock_device(udev); 4854d3b9d7a9SSarah Sharp status = usb_reset_device(udev); 4855d3b9d7a9SSarah Sharp usb_unlock_device(udev); 485665bdac5eSSarah Sharp connect_change = 0; 48575e467f6eSAndiry Xu } 4858f3e94aa1SJulius Werner } 48595e467f6eSAndiry Xu 48601da177e4SLinus Torvalds if (connect_change) 48611da177e4SLinus Torvalds hub_port_connect_change(hub, i, 48621da177e4SLinus Torvalds portstatus, portchange); 48631da177e4SLinus Torvalds } /* end for i */ 48641da177e4SLinus Torvalds 48651da177e4SLinus Torvalds /* deal with hub status changes */ 48661da177e4SLinus Torvalds if (test_and_clear_bit(0, hub->event_bits) == 0) 48671da177e4SLinus Torvalds ; /* do nothing */ 48681da177e4SLinus Torvalds else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) 48691da177e4SLinus Torvalds dev_err (hub_dev, "get_hub_status failed\n"); 48701da177e4SLinus Torvalds else { 48711da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_LOCAL_POWER) { 48721da177e4SLinus Torvalds dev_dbg (hub_dev, "power change\n"); 48731da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_LOCAL_POWER); 487455c52718SAlan Stern if (hubstatus & HUB_STATUS_LOCAL_POWER) 487555c52718SAlan Stern /* FIXME: Is this always true? */ 487655c52718SAlan Stern hub->limited_power = 1; 4877403fae78Sjidong xiao else 4878403fae78Sjidong xiao hub->limited_power = 0; 48791da177e4SLinus Torvalds } 48801da177e4SLinus Torvalds if (hubchange & HUB_CHANGE_OVERCURRENT) { 4881752d57a8SPaul Bolle u16 status = 0; 4882752d57a8SPaul Bolle u16 unused; 4883752d57a8SPaul Bolle 4884752d57a8SPaul Bolle dev_dbg(hub_dev, "over-current change\n"); 48851da177e4SLinus Torvalds clear_hub_feature(hdev, C_HUB_OVER_CURRENT); 4886752d57a8SPaul Bolle msleep(500); /* Cool down */ 48878520f380SAlan Stern hub_power_on(hub, true); 4888752d57a8SPaul Bolle hub_hub_status(hub, &status, &unused); 4889752d57a8SPaul Bolle if (status & HUB_STATUS_OVERCURRENT) 4890752d57a8SPaul Bolle dev_err(hub_dev, "over-current " 4891752d57a8SPaul Bolle "condition\n"); 48921da177e4SLinus Torvalds } 48931da177e4SLinus Torvalds } 48941da177e4SLinus Torvalds 489540f122f3SAlan Stern loop_autopm: 48968e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface() above */ 48978e4ceb38SAlan Stern usb_autopm_put_interface_no_suspend(intf); 48981da177e4SLinus Torvalds loop: 48998e4ceb38SAlan Stern /* Balance the usb_autopm_get_interface_no_resume() in 49008e4ceb38SAlan Stern * kick_khubd() and allow autosuspend. 49018e4ceb38SAlan Stern */ 49028e4ceb38SAlan Stern usb_autopm_put_interface(intf); 49039bbdf1e0SAlan Stern loop_disconnected: 49041da177e4SLinus Torvalds usb_unlock_device(hdev); 4905e8054854SAlan Stern kref_put(&hub->kref, hub_release); 49061da177e4SLinus Torvalds 49071da177e4SLinus Torvalds } /* end while (1) */ 49081da177e4SLinus Torvalds } 49091da177e4SLinus Torvalds 49101da177e4SLinus Torvalds static int hub_thread(void *__unused) 49111da177e4SLinus Torvalds { 4912025d4430SRahul Bedarkar /* khubd needs to be freezable to avoid interfering with USB-PERSIST 49133bb1af52SAlan Stern * port handover. Otherwise it might see that a full-speed device 49143bb1af52SAlan Stern * was gone before the EHCI controller had handed its port over to 49153bb1af52SAlan Stern * the companion full-speed controller. 49163bb1af52SAlan Stern */ 491783144186SRafael J. Wysocki set_freezable(); 49183bb1af52SAlan Stern 49191da177e4SLinus Torvalds do { 49201da177e4SLinus Torvalds hub_events(); 4921e42837bcSRafael J. Wysocki wait_event_freezable(khubd_wait, 49229c8d6178Sakpm@osdl.org !list_empty(&hub_event_list) || 49239c8d6178Sakpm@osdl.org kthread_should_stop()); 49249c8d6178Sakpm@osdl.org } while (!kthread_should_stop() || !list_empty(&hub_event_list)); 49251da177e4SLinus Torvalds 49261da177e4SLinus Torvalds pr_debug("%s: khubd exiting\n", usbcore_name); 49279c8d6178Sakpm@osdl.org return 0; 49281da177e4SLinus Torvalds } 49291da177e4SLinus Torvalds 49301e927d96SNémeth Márton static const struct usb_device_id hub_id_table[] = { 4931e6f30deaSMing Lei { .match_flags = USB_DEVICE_ID_MATCH_VENDOR 4932e6f30deaSMing Lei | USB_DEVICE_ID_MATCH_INT_CLASS, 4933e6f30deaSMing Lei .idVendor = USB_VENDOR_GENESYS_LOGIC, 4934e6f30deaSMing Lei .bInterfaceClass = USB_CLASS_HUB, 4935e6f30deaSMing Lei .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, 49361da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, 49371da177e4SLinus Torvalds .bDeviceClass = USB_CLASS_HUB}, 49381da177e4SLinus Torvalds { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, 49391da177e4SLinus Torvalds .bInterfaceClass = USB_CLASS_HUB}, 49401da177e4SLinus Torvalds { } /* Terminating entry */ 49411da177e4SLinus Torvalds }; 49421da177e4SLinus Torvalds 49431da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, hub_id_table); 49441da177e4SLinus Torvalds 49451da177e4SLinus Torvalds static struct usb_driver hub_driver = { 49461da177e4SLinus Torvalds .name = "hub", 49471da177e4SLinus Torvalds .probe = hub_probe, 49481da177e4SLinus Torvalds .disconnect = hub_disconnect, 49491da177e4SLinus Torvalds .suspend = hub_suspend, 49501da177e4SLinus Torvalds .resume = hub_resume, 4951f07600cfSAlan Stern .reset_resume = hub_reset_resume, 49527de18d8bSAlan Stern .pre_reset = hub_pre_reset, 49537de18d8bSAlan Stern .post_reset = hub_post_reset, 4954c532b29aSAndi Kleen .unlocked_ioctl = hub_ioctl, 49551da177e4SLinus Torvalds .id_table = hub_id_table, 495640f122f3SAlan Stern .supports_autosuspend = 1, 49571da177e4SLinus Torvalds }; 49581da177e4SLinus Torvalds 49591da177e4SLinus Torvalds int usb_hub_init(void) 49601da177e4SLinus Torvalds { 49611da177e4SLinus Torvalds if (usb_register(&hub_driver) < 0) { 49621da177e4SLinus Torvalds printk(KERN_ERR "%s: can't register hub driver\n", 49631da177e4SLinus Torvalds usbcore_name); 49641da177e4SLinus Torvalds return -1; 49651da177e4SLinus Torvalds } 49661da177e4SLinus Torvalds 49679c8d6178Sakpm@osdl.org khubd_task = kthread_run(hub_thread, NULL, "khubd"); 49689c8d6178Sakpm@osdl.org if (!IS_ERR(khubd_task)) 49691da177e4SLinus Torvalds return 0; 49701da177e4SLinus Torvalds 49711da177e4SLinus Torvalds /* Fall through if kernel_thread failed */ 49721da177e4SLinus Torvalds usb_deregister(&hub_driver); 49731da177e4SLinus Torvalds printk(KERN_ERR "%s: can't start khubd\n", usbcore_name); 49741da177e4SLinus Torvalds 49751da177e4SLinus Torvalds return -1; 49761da177e4SLinus Torvalds } 49771da177e4SLinus Torvalds 49781da177e4SLinus Torvalds void usb_hub_cleanup(void) 49791da177e4SLinus Torvalds { 49809c8d6178Sakpm@osdl.org kthread_stop(khubd_task); 49811da177e4SLinus Torvalds 49821da177e4SLinus Torvalds /* 49831da177e4SLinus Torvalds * Hub resources are freed for us by usb_deregister. It calls 49841da177e4SLinus Torvalds * usb_driver_purge on every device which in turn calls that 49851da177e4SLinus Torvalds * devices disconnect function if it is using this driver. 49861da177e4SLinus Torvalds * The hub_disconnect function takes care of releasing the 49871da177e4SLinus Torvalds * individual hub resources. -greg 49881da177e4SLinus Torvalds */ 49891da177e4SLinus Torvalds usb_deregister(&hub_driver); 49901da177e4SLinus Torvalds } /* usb_hub_cleanup() */ 49911da177e4SLinus Torvalds 4992eb764c4bSAlan Stern static int descriptors_changed(struct usb_device *udev, 4993e3376d6cSXenia Ragiadakou struct usb_device_descriptor *old_device_descriptor, 4994e3376d6cSXenia Ragiadakou struct usb_host_bos *old_bos) 49951da177e4SLinus Torvalds { 4996eb764c4bSAlan Stern int changed = 0; 49971da177e4SLinus Torvalds unsigned index; 4998eb764c4bSAlan Stern unsigned serial_len = 0; 4999eb764c4bSAlan Stern unsigned len; 5000eb764c4bSAlan Stern unsigned old_length; 5001eb764c4bSAlan Stern int length; 5002eb764c4bSAlan Stern char *buf; 50031da177e4SLinus Torvalds 5004eb764c4bSAlan Stern if (memcmp(&udev->descriptor, old_device_descriptor, 5005eb764c4bSAlan Stern sizeof(*old_device_descriptor)) != 0) 5006eb764c4bSAlan Stern return 1; 5007eb764c4bSAlan Stern 5008e3376d6cSXenia Ragiadakou if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) 5009e3376d6cSXenia Ragiadakou return 1; 5010e3376d6cSXenia Ragiadakou if (udev->bos) { 5011b9a10481SXenia Ragiadakou len = le16_to_cpu(udev->bos->desc->wTotalLength); 5012b9a10481SXenia Ragiadakou if (len != le16_to_cpu(old_bos->desc->wTotalLength)) 5013e3376d6cSXenia Ragiadakou return 1; 5014b9a10481SXenia Ragiadakou if (memcmp(udev->bos->desc, old_bos->desc, len)) 5015e3376d6cSXenia Ragiadakou return 1; 5016e3376d6cSXenia Ragiadakou } 5017e3376d6cSXenia Ragiadakou 5018eb764c4bSAlan Stern /* Since the idVendor, idProduct, and bcdDevice values in the 5019eb764c4bSAlan Stern * device descriptor haven't changed, we will assume the 5020eb764c4bSAlan Stern * Manufacturer and Product strings haven't changed either. 5021eb764c4bSAlan Stern * But the SerialNumber string could be different (e.g., a 5022eb764c4bSAlan Stern * different flash card of the same brand). 5023eb764c4bSAlan Stern */ 5024eb764c4bSAlan Stern if (udev->serial) 5025eb764c4bSAlan Stern serial_len = strlen(udev->serial) + 1; 5026eb764c4bSAlan Stern 5027eb764c4bSAlan Stern len = serial_len; 50281da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5029eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 5030eb764c4bSAlan Stern len = max(len, old_length); 50311da177e4SLinus Torvalds } 5032eb764c4bSAlan Stern 50330cc1a51fSOliver Neukum buf = kmalloc(len, GFP_NOIO); 50341da177e4SLinus Torvalds if (buf == NULL) { 50351da177e4SLinus Torvalds dev_err(&udev->dev, "no mem to re-read configs after reset\n"); 50361da177e4SLinus Torvalds /* assume the worst */ 50371da177e4SLinus Torvalds return 1; 50381da177e4SLinus Torvalds } 50391da177e4SLinus Torvalds for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { 5040eb764c4bSAlan Stern old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); 50411da177e4SLinus Torvalds length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, 50421da177e4SLinus Torvalds old_length); 5043eb764c4bSAlan Stern if (length != old_length) { 50441da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d, error %d\n", 50451da177e4SLinus Torvalds index, length); 5046eb764c4bSAlan Stern changed = 1; 50471da177e4SLinus Torvalds break; 50481da177e4SLinus Torvalds } 50491da177e4SLinus Torvalds if (memcmp (buf, udev->rawdescriptors[index], old_length) 50501da177e4SLinus Torvalds != 0) { 50511da177e4SLinus Torvalds dev_dbg(&udev->dev, "config index %d changed (#%d)\n", 5052eb764c4bSAlan Stern index, 5053eb764c4bSAlan Stern ((struct usb_config_descriptor *) buf)-> 5054eb764c4bSAlan Stern bConfigurationValue); 5055eb764c4bSAlan Stern changed = 1; 50561da177e4SLinus Torvalds break; 50571da177e4SLinus Torvalds } 50581da177e4SLinus Torvalds } 5059eb764c4bSAlan Stern 5060eb764c4bSAlan Stern if (!changed && serial_len) { 5061eb764c4bSAlan Stern length = usb_string(udev, udev->descriptor.iSerialNumber, 5062eb764c4bSAlan Stern buf, serial_len); 5063eb764c4bSAlan Stern if (length + 1 != serial_len) { 5064eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string error %d\n", 5065eb764c4bSAlan Stern length); 5066eb764c4bSAlan Stern changed = 1; 5067eb764c4bSAlan Stern } else if (memcmp(buf, udev->serial, length) != 0) { 5068eb764c4bSAlan Stern dev_dbg(&udev->dev, "serial string changed\n"); 5069eb764c4bSAlan Stern changed = 1; 5070eb764c4bSAlan Stern } 5071eb764c4bSAlan Stern } 5072eb764c4bSAlan Stern 50731da177e4SLinus Torvalds kfree(buf); 5074eb764c4bSAlan Stern return changed; 50751da177e4SLinus Torvalds } 50761da177e4SLinus Torvalds 50771da177e4SLinus Torvalds /** 5078742120c6SMing Lei * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device 50791da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 50801da177e4SLinus Torvalds * 508179efa097SAlan Stern * WARNING - don't use this routine to reset a composite device 508279efa097SAlan Stern * (one with multiple interfaces owned by separate drivers)! 5083742120c6SMing Lei * Use usb_reset_device() instead. 50841da177e4SLinus Torvalds * 50851da177e4SLinus Torvalds * Do a port reset, reassign the device's address, and establish its 50861da177e4SLinus Torvalds * former operating configuration. If the reset fails, or the device's 50871da177e4SLinus Torvalds * descriptors change from their values before the reset, or the original 50881da177e4SLinus Torvalds * configuration and altsettings cannot be restored, a flag will be set 50891da177e4SLinus Torvalds * telling khubd to pretend the device has been disconnected and then 50901da177e4SLinus Torvalds * re-connected. All drivers will be unbound, and the device will be 50911da177e4SLinus Torvalds * re-enumerated and probed all over again. 50921da177e4SLinus Torvalds * 5093626f090cSYacine Belkadi * Return: 0 if the reset succeeded, -ENODEV if the device has been 50941da177e4SLinus Torvalds * flagged for logical disconnection, or some other negative error code 50951da177e4SLinus Torvalds * if the reset wasn't even attempted. 50961da177e4SLinus Torvalds * 5097626f090cSYacine Belkadi * Note: 50981da177e4SLinus Torvalds * The caller must own the device lock. For example, it's safe to use 50991da177e4SLinus Torvalds * this from a driver probe() routine after downloading new firmware. 51001da177e4SLinus Torvalds * For calls that might not occur during probe(), drivers should lock 51011da177e4SLinus Torvalds * the device using usb_lock_device_for_reset(). 51026bc6cff5SAlan Stern * 51036bc6cff5SAlan Stern * Locking exception: This routine may also be called from within an 51046bc6cff5SAlan Stern * autoresume handler. Such usage won't conflict with other tasks 51056bc6cff5SAlan Stern * holding the device lock because these tasks should always call 51066bc6cff5SAlan Stern * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. 51071da177e4SLinus Torvalds */ 5108742120c6SMing Lei static int usb_reset_and_verify_device(struct usb_device *udev) 51091da177e4SLinus Torvalds { 51101da177e4SLinus Torvalds struct usb_device *parent_hdev = udev->parent; 51111da177e4SLinus Torvalds struct usb_hub *parent_hub; 51123f0479e0SSarah Sharp struct usb_hcd *hcd = bus_to_hcd(udev->bus); 51131da177e4SLinus Torvalds struct usb_device_descriptor descriptor = udev->descriptor; 5114e3376d6cSXenia Ragiadakou struct usb_host_bos *bos; 511512c3da34SAlan Stern int i, ret = 0; 511612c3da34SAlan Stern int port1 = udev->portnum; 51171da177e4SLinus Torvalds 51181da177e4SLinus Torvalds if (udev->state == USB_STATE_NOTATTACHED || 51191da177e4SLinus Torvalds udev->state == USB_STATE_SUSPENDED) { 51201da177e4SLinus Torvalds dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 51211da177e4SLinus Torvalds udev->state); 51221da177e4SLinus Torvalds return -EINVAL; 51231da177e4SLinus Torvalds } 51241da177e4SLinus Torvalds 51251da177e4SLinus Torvalds if (!parent_hdev) { 51264bec9917SWolfram Sang /* this requires hcd-specific logic; see ohci_restart() */ 5127441b62c1SHarvey Harrison dev_dbg(&udev->dev, "%s for root hub!\n", __func__); 51281da177e4SLinus Torvalds return -EISDIR; 51291da177e4SLinus Torvalds } 5130ad493e5eSLan Tianyu parent_hub = usb_hub_to_struct_hub(parent_hdev); 51311da177e4SLinus Torvalds 5132dcc01c08SSarah Sharp /* Disable USB2 hardware LPM. 5133dcc01c08SSarah Sharp * It will be re-enabled by the enumeration process. 5134dcc01c08SSarah Sharp */ 5135dcc01c08SSarah Sharp if (udev->usb2_hw_lpm_enabled == 1) 5136dcc01c08SSarah Sharp usb_set_usb2_hardware_lpm(udev, 0); 5137dcc01c08SSarah Sharp 5138e3376d6cSXenia Ragiadakou bos = udev->bos; 5139e3376d6cSXenia Ragiadakou udev->bos = NULL; 5140e3376d6cSXenia Ragiadakou 5141f74631e3SSarah Sharp /* Disable LPM and LTM while we reset the device and reinstall the alt 5142f74631e3SSarah Sharp * settings. Device-initiated LPM settings, and system exit latency 5143f74631e3SSarah Sharp * settings are cleared when the device is reset, so we have to set 5144f74631e3SSarah Sharp * them up again. 51456d1d0513SSarah Sharp */ 51466d1d0513SSarah Sharp ret = usb_unlocked_disable_lpm(udev); 51476d1d0513SSarah Sharp if (ret) { 51486d1d0513SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__); 51496d1d0513SSarah Sharp goto re_enumerate; 51506d1d0513SSarah Sharp } 5151f74631e3SSarah Sharp ret = usb_disable_ltm(udev); 5152f74631e3SSarah Sharp if (ret) { 5153f74631e3SSarah Sharp dev_err(&udev->dev, "%s Failed to disable LTM\n.", 5154f74631e3SSarah Sharp __func__); 5155f74631e3SSarah Sharp goto re_enumerate; 5156f74631e3SSarah Sharp } 51576d1d0513SSarah Sharp 51581da177e4SLinus Torvalds set_bit(port1, parent_hub->busy_bits); 51591da177e4SLinus Torvalds for (i = 0; i < SET_CONFIG_TRIES; ++i) { 51601da177e4SLinus Torvalds 51611da177e4SLinus Torvalds /* ep0 maxpacket size may change; let the HCD know about it. 51621da177e4SLinus Torvalds * Other endpoints will be handled by re-enumeration. */ 5163fc721f51SInaky Perez-Gonzalez usb_ep0_reinit(udev); 51641da177e4SLinus Torvalds ret = hub_port_init(parent_hub, udev, port1, i); 5165dd4dd19eSAlan Stern if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) 51661da177e4SLinus Torvalds break; 51671da177e4SLinus Torvalds } 51681da177e4SLinus Torvalds clear_bit(port1, parent_hub->busy_bits); 5169d5cbad4bSAlan Stern 51701da177e4SLinus Torvalds if (ret < 0) 51711da177e4SLinus Torvalds goto re_enumerate; 51721da177e4SLinus Torvalds 51731da177e4SLinus Torvalds /* Device might have changed firmware (DFU or similar) */ 5174e3376d6cSXenia Ragiadakou if (descriptors_changed(udev, &descriptor, bos)) { 51751da177e4SLinus Torvalds dev_info(&udev->dev, "device firmware changed\n"); 51761da177e4SLinus Torvalds udev->descriptor = descriptor; /* for disconnect() calls */ 51771da177e4SLinus Torvalds goto re_enumerate; 51781da177e4SLinus Torvalds } 51791da177e4SLinus Torvalds 51804fe0387aSAlan Stern /* Restore the device's previous configuration */ 51811da177e4SLinus Torvalds if (!udev->actconfig) 51821da177e4SLinus Torvalds goto done; 51833f0479e0SSarah Sharp 5184d673bfcbSSarah Sharp mutex_lock(hcd->bandwidth_mutex); 51853f0479e0SSarah Sharp ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); 51863f0479e0SSarah Sharp if (ret < 0) { 51873f0479e0SSarah Sharp dev_warn(&udev->dev, 51883f0479e0SSarah Sharp "Busted HC? Not enough HCD resources for " 51893f0479e0SSarah Sharp "old configuration.\n"); 5190d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 51913f0479e0SSarah Sharp goto re_enumerate; 51923f0479e0SSarah Sharp } 51931da177e4SLinus Torvalds ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 51941da177e4SLinus Torvalds USB_REQ_SET_CONFIGURATION, 0, 51951da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, 0, 51961da177e4SLinus Torvalds NULL, 0, USB_CTRL_SET_TIMEOUT); 51971da177e4SLinus Torvalds if (ret < 0) { 51981da177e4SLinus Torvalds dev_err(&udev->dev, 51991da177e4SLinus Torvalds "can't restore configuration #%d (error=%d)\n", 52001da177e4SLinus Torvalds udev->actconfig->desc.bConfigurationValue, ret); 5201d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 52021da177e4SLinus Torvalds goto re_enumerate; 52031da177e4SLinus Torvalds } 5204d673bfcbSSarah Sharp mutex_unlock(hcd->bandwidth_mutex); 52051da177e4SLinus Torvalds usb_set_device_state(udev, USB_STATE_CONFIGURED); 52061da177e4SLinus Torvalds 52074fe0387aSAlan Stern /* Put interfaces back into the same altsettings as before. 52084fe0387aSAlan Stern * Don't bother to send the Set-Interface request for interfaces 52094fe0387aSAlan Stern * that were already in altsetting 0; besides being unnecessary, 52104fe0387aSAlan Stern * many devices can't handle it. Instead just reset the host-side 52114fe0387aSAlan Stern * endpoint state. 52124fe0387aSAlan Stern */ 52131da177e4SLinus Torvalds for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { 52143f0479e0SSarah Sharp struct usb_host_config *config = udev->actconfig; 52153f0479e0SSarah Sharp struct usb_interface *intf = config->interface[i]; 52161da177e4SLinus Torvalds struct usb_interface_descriptor *desc; 52171da177e4SLinus Torvalds 52181da177e4SLinus Torvalds desc = &intf->cur_altsetting->desc; 52194fe0387aSAlan Stern if (desc->bAlternateSetting == 0) { 52204fe0387aSAlan Stern usb_disable_interface(udev, intf, true); 52214fe0387aSAlan Stern usb_enable_interface(udev, intf, true); 52224fe0387aSAlan Stern ret = 0; 52234fe0387aSAlan Stern } else { 522404a723eaSSarah Sharp /* Let the bandwidth allocation function know that this 522504a723eaSSarah Sharp * device has been reset, and it will have to use 522604a723eaSSarah Sharp * alternate setting 0 as the current alternate setting. 52273f0479e0SSarah Sharp */ 522804a723eaSSarah Sharp intf->resetting_device = 1; 52291da177e4SLinus Torvalds ret = usb_set_interface(udev, desc->bInterfaceNumber, 52301da177e4SLinus Torvalds desc->bAlternateSetting); 523104a723eaSSarah Sharp intf->resetting_device = 0; 52324fe0387aSAlan Stern } 52331da177e4SLinus Torvalds if (ret < 0) { 52341da177e4SLinus Torvalds dev_err(&udev->dev, "failed to restore interface %d " 52351da177e4SLinus Torvalds "altsetting %d (error=%d)\n", 52361da177e4SLinus Torvalds desc->bInterfaceNumber, 52371da177e4SLinus Torvalds desc->bAlternateSetting, 52381da177e4SLinus Torvalds ret); 52391da177e4SLinus Torvalds goto re_enumerate; 52401da177e4SLinus Torvalds } 52411da177e4SLinus Torvalds } 52421da177e4SLinus Torvalds 52431da177e4SLinus Torvalds done: 5244f74631e3SSarah Sharp /* Now that the alt settings are re-installed, enable LTM and LPM. */ 5245de68bab4SSarah Sharp usb_set_usb2_hardware_lpm(udev, 1); 524678d9a487SAlan Stern usb_unlocked_enable_lpm(udev); 5247f74631e3SSarah Sharp usb_enable_ltm(udev); 5248e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5249e3376d6cSXenia Ragiadakou udev->bos = bos; 52501da177e4SLinus Torvalds return 0; 52511da177e4SLinus Torvalds 52521da177e4SLinus Torvalds re_enumerate: 52536d1d0513SSarah Sharp /* LPM state doesn't matter when we're about to destroy the device. */ 52541da177e4SLinus Torvalds hub_port_logical_disconnect(parent_hub, port1); 5255e3376d6cSXenia Ragiadakou usb_release_bos_descriptor(udev); 5256e3376d6cSXenia Ragiadakou udev->bos = bos; 52571da177e4SLinus Torvalds return -ENODEV; 52581da177e4SLinus Torvalds } 52591da177e4SLinus Torvalds 52601da177e4SLinus Torvalds /** 52611da177e4SLinus Torvalds * usb_reset_device - warn interface drivers and perform a USB port reset 52621da177e4SLinus Torvalds * @udev: device to reset (not in SUSPENDED or NOTATTACHED state) 52631da177e4SLinus Torvalds * 526479efa097SAlan Stern * Warns all drivers bound to registered interfaces (using their pre_reset 526579efa097SAlan Stern * method), performs the port reset, and then lets the drivers know that 5266742120c6SMing Lei * the reset is over (using their post_reset method). 526779efa097SAlan Stern * 5268626f090cSYacine Belkadi * Return: The same as for usb_reset_and_verify_device(). 526979efa097SAlan Stern * 5270626f090cSYacine Belkadi * Note: 527179efa097SAlan Stern * The caller must own the device lock. For example, it's safe to use 527279efa097SAlan Stern * this from a driver probe() routine after downloading new firmware. 527379efa097SAlan Stern * For calls that might not occur during probe(), drivers should lock 5274742120c6SMing Lei * the device using usb_lock_device_for_reset(). 527579efa097SAlan Stern * 527679efa097SAlan Stern * If an interface is currently being probed or disconnected, we assume 527779efa097SAlan Stern * its driver knows how to handle resets. For all other interfaces, 527879efa097SAlan Stern * if the driver doesn't have pre_reset and post_reset methods then 527979efa097SAlan Stern * we attempt to unbind it and rebind afterward. 528079efa097SAlan Stern */ 5281742120c6SMing Lei int usb_reset_device(struct usb_device *udev) 528279efa097SAlan Stern { 528379efa097SAlan Stern int ret; 5284852c4b43SAlan Stern int i; 52854d769defSMing Lei unsigned int noio_flag; 528679efa097SAlan Stern struct usb_host_config *config = udev->actconfig; 528779efa097SAlan Stern 528879efa097SAlan Stern if (udev->state == USB_STATE_NOTATTACHED || 528979efa097SAlan Stern udev->state == USB_STATE_SUSPENDED) { 529079efa097SAlan Stern dev_dbg(&udev->dev, "device reset not allowed in state %d\n", 529179efa097SAlan Stern udev->state); 529279efa097SAlan Stern return -EINVAL; 529379efa097SAlan Stern } 529479efa097SAlan Stern 52954d769defSMing Lei /* 52964d769defSMing Lei * Don't allocate memory with GFP_KERNEL in current 52974d769defSMing Lei * context to avoid possible deadlock if usb mass 52984d769defSMing Lei * storage interface or usbnet interface(iSCSI case) 52994d769defSMing Lei * is included in current configuration. The easist 53004d769defSMing Lei * approach is to do it for every device reset, 53014d769defSMing Lei * because the device 'memalloc_noio' flag may have 53024d769defSMing Lei * not been set before reseting the usb device. 53034d769defSMing Lei */ 53044d769defSMing Lei noio_flag = memalloc_noio_save(); 53054d769defSMing Lei 5306645daaabSAlan Stern /* Prevent autosuspend during the reset */ 530794fcda1fSAlan Stern usb_autoresume_device(udev); 5308645daaabSAlan Stern 530979efa097SAlan Stern if (config) { 5310852c4b43SAlan Stern for (i = 0; i < config->desc.bNumInterfaces; ++i) { 5311852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 531279efa097SAlan Stern struct usb_driver *drv; 531378d9a487SAlan Stern int unbind = 0; 531479efa097SAlan Stern 5315852c4b43SAlan Stern if (cintf->dev.driver) { 531679efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 531778d9a487SAlan Stern if (drv->pre_reset && drv->post_reset) 531878d9a487SAlan Stern unbind = (drv->pre_reset)(cintf); 531978d9a487SAlan Stern else if (cintf->condition == 532078d9a487SAlan Stern USB_INTERFACE_BOUND) 532178d9a487SAlan Stern unbind = 1; 532278d9a487SAlan Stern if (unbind) 532378d9a487SAlan Stern usb_forced_unbind_intf(cintf); 532479efa097SAlan Stern } 532579efa097SAlan Stern } 532679efa097SAlan Stern } 532779efa097SAlan Stern 5328742120c6SMing Lei ret = usb_reset_and_verify_device(udev); 532979efa097SAlan Stern 533079efa097SAlan Stern if (config) { 5331852c4b43SAlan Stern for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { 5332852c4b43SAlan Stern struct usb_interface *cintf = config->interface[i]; 533379efa097SAlan Stern struct usb_driver *drv; 533478d9a487SAlan Stern int rebind = cintf->needs_binding; 533579efa097SAlan Stern 533678d9a487SAlan Stern if (!rebind && cintf->dev.driver) { 533779efa097SAlan Stern drv = to_usb_driver(cintf->dev.driver); 533879efa097SAlan Stern if (drv->post_reset) 533978d9a487SAlan Stern rebind = (drv->post_reset)(cintf); 534078d9a487SAlan Stern else if (cintf->condition == 534178d9a487SAlan Stern USB_INTERFACE_BOUND) 534278d9a487SAlan Stern rebind = 1; 534379efa097SAlan Stern } 53446c640945SAlan Stern if (ret == 0 && rebind) 534578d9a487SAlan Stern usb_rebind_intf(cintf); 534679efa097SAlan Stern } 534779efa097SAlan Stern } 534879efa097SAlan Stern 534994fcda1fSAlan Stern usb_autosuspend_device(udev); 53504d769defSMing Lei memalloc_noio_restore(noio_flag); 535179efa097SAlan Stern return ret; 535279efa097SAlan Stern } 5353742120c6SMing Lei EXPORT_SYMBOL_GPL(usb_reset_device); 5354dc023dceSInaky Perez-Gonzalez 5355dc023dceSInaky Perez-Gonzalez 5356dc023dceSInaky Perez-Gonzalez /** 5357dc023dceSInaky Perez-Gonzalez * usb_queue_reset_device - Reset a USB device from an atomic context 5358dc023dceSInaky Perez-Gonzalez * @iface: USB interface belonging to the device to reset 5359dc023dceSInaky Perez-Gonzalez * 5360dc023dceSInaky Perez-Gonzalez * This function can be used to reset a USB device from an atomic 5361dc023dceSInaky Perez-Gonzalez * context, where usb_reset_device() won't work (as it blocks). 5362dc023dceSInaky Perez-Gonzalez * 5363dc023dceSInaky Perez-Gonzalez * Doing a reset via this method is functionally equivalent to calling 5364dc023dceSInaky Perez-Gonzalez * usb_reset_device(), except for the fact that it is delayed to a 5365dc023dceSInaky Perez-Gonzalez * workqueue. This means that any drivers bound to other interfaces 5366dc023dceSInaky Perez-Gonzalez * might be unbound, as well as users from usbfs in user space. 5367dc023dceSInaky Perez-Gonzalez * 5368dc023dceSInaky Perez-Gonzalez * Corner cases: 5369dc023dceSInaky Perez-Gonzalez * 5370dc023dceSInaky Perez-Gonzalez * - Scheduling two resets at the same time from two different drivers 5371dc023dceSInaky Perez-Gonzalez * attached to two different interfaces of the same device is 5372dc023dceSInaky Perez-Gonzalez * possible; depending on how the driver attached to each interface 5373dc023dceSInaky Perez-Gonzalez * handles ->pre_reset(), the second reset might happen or not. 5374dc023dceSInaky Perez-Gonzalez * 5375dc023dceSInaky Perez-Gonzalez * - If a driver is unbound and it had a pending reset, the reset will 5376dc023dceSInaky Perez-Gonzalez * be cancelled. 5377dc023dceSInaky Perez-Gonzalez * 5378dc023dceSInaky Perez-Gonzalez * - This function can be called during .probe() or .disconnect() 5379dc023dceSInaky Perez-Gonzalez * times. On return from .disconnect(), any pending resets will be 5380dc023dceSInaky Perez-Gonzalez * cancelled. 5381dc023dceSInaky Perez-Gonzalez * 5382dc023dceSInaky Perez-Gonzalez * There is no no need to lock/unlock the @reset_ws as schedule_work() 5383dc023dceSInaky Perez-Gonzalez * does its own. 5384dc023dceSInaky Perez-Gonzalez * 5385dc023dceSInaky Perez-Gonzalez * NOTE: We don't do any reference count tracking because it is not 5386dc023dceSInaky Perez-Gonzalez * needed. The lifecycle of the work_struct is tied to the 5387dc023dceSInaky Perez-Gonzalez * usb_interface. Before destroying the interface we cancel the 5388dc023dceSInaky Perez-Gonzalez * work_struct, so the fact that work_struct is queued and or 5389dc023dceSInaky Perez-Gonzalez * running means the interface (and thus, the device) exist and 5390dc023dceSInaky Perez-Gonzalez * are referenced. 5391dc023dceSInaky Perez-Gonzalez */ 5392dc023dceSInaky Perez-Gonzalez void usb_queue_reset_device(struct usb_interface *iface) 5393dc023dceSInaky Perez-Gonzalez { 5394dc023dceSInaky Perez-Gonzalez schedule_work(&iface->reset_ws); 5395dc023dceSInaky Perez-Gonzalez } 5396dc023dceSInaky Perez-Gonzalez EXPORT_SYMBOL_GPL(usb_queue_reset_device); 5397ff823c79SLan Tianyu 5398ff823c79SLan Tianyu /** 5399ff823c79SLan Tianyu * usb_hub_find_child - Get the pointer of child device 5400ff823c79SLan Tianyu * attached to the port which is specified by @port1. 5401ff823c79SLan Tianyu * @hdev: USB device belonging to the usb hub 5402ff823c79SLan Tianyu * @port1: port num to indicate which port the child device 5403ff823c79SLan Tianyu * is attached to. 5404ff823c79SLan Tianyu * 5405ff823c79SLan Tianyu * USB drivers call this function to get hub's child device 5406ff823c79SLan Tianyu * pointer. 5407ff823c79SLan Tianyu * 5408626f090cSYacine Belkadi * Return: %NULL if input param is invalid and 5409ff823c79SLan Tianyu * child's usb_device pointer if non-NULL. 5410ff823c79SLan Tianyu */ 5411ff823c79SLan Tianyu struct usb_device *usb_hub_find_child(struct usb_device *hdev, 5412ff823c79SLan Tianyu int port1) 5413ff823c79SLan Tianyu { 5414ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5415ff823c79SLan Tianyu 5416ff823c79SLan Tianyu if (port1 < 1 || port1 > hdev->maxchild) 5417ff823c79SLan Tianyu return NULL; 5418ff823c79SLan Tianyu return hub->ports[port1 - 1]->child; 5419ff823c79SLan Tianyu } 5420ff823c79SLan Tianyu EXPORT_SYMBOL_GPL(usb_hub_find_child); 5421d5575424SLan Tianyu 542205f91689SLan Tianyu /** 542305f91689SLan Tianyu * usb_set_hub_port_connect_type - set hub port connect type. 542405f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 542505f91689SLan Tianyu * @port1: port num of the port 542605f91689SLan Tianyu * @type: connect type of the port 542705f91689SLan Tianyu */ 542805f91689SLan Tianyu void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1, 542905f91689SLan Tianyu enum usb_port_connect_type type) 543005f91689SLan Tianyu { 5431ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 543205f91689SLan Tianyu 543341341261SMathias Nyman if (hub) 543405f91689SLan Tianyu hub->ports[port1 - 1]->connect_type = type; 543505f91689SLan Tianyu } 543605f91689SLan Tianyu 543705f91689SLan Tianyu /** 543805f91689SLan Tianyu * usb_get_hub_port_connect_type - Get the port's connect type 543905f91689SLan Tianyu * @hdev: USB device belonging to the usb hub 544005f91689SLan Tianyu * @port1: port num of the port 544105f91689SLan Tianyu * 5442626f090cSYacine Belkadi * Return: The connect type of the port if successful. Or 5443626f090cSYacine Belkadi * USB_PORT_CONNECT_TYPE_UNKNOWN if input params are invalid. 544405f91689SLan Tianyu */ 544505f91689SLan Tianyu enum usb_port_connect_type 544605f91689SLan Tianyu usb_get_hub_port_connect_type(struct usb_device *hdev, int port1) 544705f91689SLan Tianyu { 5448ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 544905f91689SLan Tianyu 545041341261SMathias Nyman if (!hub) 545141341261SMathias Nyman return USB_PORT_CONNECT_TYPE_UNKNOWN; 545241341261SMathias Nyman 545305f91689SLan Tianyu return hub->ports[port1 - 1]->connect_type; 545405f91689SLan Tianyu } 545505f91689SLan Tianyu 5456d2123fd9SLan Tianyu void usb_hub_adjust_deviceremovable(struct usb_device *hdev, 5457d2123fd9SLan Tianyu struct usb_hub_descriptor *desc) 5458d2123fd9SLan Tianyu { 5459d2123fd9SLan Tianyu enum usb_port_connect_type connect_type; 5460d2123fd9SLan Tianyu int i; 5461d2123fd9SLan Tianyu 5462d2123fd9SLan Tianyu if (!hub_is_superspeed(hdev)) { 5463d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5464d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5465d2123fd9SLan Tianyu 5466d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5467d2123fd9SLan Tianyu u8 mask = 1 << (i%8); 5468d2123fd9SLan Tianyu 5469d2123fd9SLan Tianyu if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { 5470d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5471d2123fd9SLan Tianyu i); 5472d2123fd9SLan Tianyu desc->u.hs.DeviceRemovable[i/8] |= mask; 5473d2123fd9SLan Tianyu } 5474d2123fd9SLan Tianyu } 5475d2123fd9SLan Tianyu } 5476d2123fd9SLan Tianyu } else { 5477d2123fd9SLan Tianyu u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); 5478d2123fd9SLan Tianyu 5479d2123fd9SLan Tianyu for (i = 1; i <= hdev->maxchild; i++) { 5480d2123fd9SLan Tianyu connect_type = usb_get_hub_port_connect_type(hdev, i); 5481d2123fd9SLan Tianyu 5482d2123fd9SLan Tianyu if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { 5483d2123fd9SLan Tianyu u16 mask = 1 << i; 5484d2123fd9SLan Tianyu 5485d2123fd9SLan Tianyu if (!(port_removable & mask)) { 5486d2123fd9SLan Tianyu dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n", 5487d2123fd9SLan Tianyu i); 5488d2123fd9SLan Tianyu port_removable |= mask; 5489d2123fd9SLan Tianyu } 5490d2123fd9SLan Tianyu } 5491d2123fd9SLan Tianyu } 5492d2123fd9SLan Tianyu 5493d2123fd9SLan Tianyu desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); 5494d2123fd9SLan Tianyu } 5495d2123fd9SLan Tianyu } 5496d2123fd9SLan Tianyu 5497d5575424SLan Tianyu #ifdef CONFIG_ACPI 5498d5575424SLan Tianyu /** 5499d5575424SLan Tianyu * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle 5500d5575424SLan Tianyu * @hdev: USB device belonging to the usb hub 5501d5575424SLan Tianyu * @port1: port num of the port 5502d5575424SLan Tianyu * 5503626f090cSYacine Belkadi * Return: Port's acpi handle if successful, %NULL if params are 5504626f090cSYacine Belkadi * invalid. 5505d5575424SLan Tianyu */ 5506d5575424SLan Tianyu acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, 5507d5575424SLan Tianyu int port1) 5508d5575424SLan Tianyu { 5509ad493e5eSLan Tianyu struct usb_hub *hub = usb_hub_to_struct_hub(hdev); 5510d5575424SLan Tianyu 551141341261SMathias Nyman if (!hub) 551241341261SMathias Nyman return NULL; 551341341261SMathias Nyman 55143a83f992SRafael J. Wysocki return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); 5515d5575424SLan Tianyu } 5516d5575424SLan Tianyu #endif 5517