4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/usb/hcd.h>
23 #include <linux/usb/quirks.h>
24 #include <linux/kthread.h>
25 #include <linux/mutex.h>
26 #include <linux/freezer.h>
28 #include <asm/uaccess.h>
29 #include <asm/byteorder.h>
33 /* if we are in debug mode, always announce new devices */
35 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
36 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
41 struct device *intfdev; /* the "interface" device */
42 struct usb_device *hdev;
44 struct urb *urb; /* for interrupt polling pipe */
46 /* buffer for urb ... with extra space in case of babble */
49 struct usb_hub_status hub;
50 struct usb_port_status port;
51 } *status; /* buffer for status reports */
52 struct mutex status_mutex; /* for the status buffer */
54 int error; /* last reported error */
55 int nerrors; /* track consecutive errors */
57 struct list_head event_list; /* hubs w/data or errs ready */
58 unsigned long event_bits[1]; /* status change bitmask */
59 unsigned long change_bits[1]; /* ports with logical connect
61 unsigned long busy_bits[1]; /* ports being reset or
63 unsigned long removed_bits[1]; /* ports with a "removed"
65 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
66 #error event_bits[] is too short!
69 struct usb_hub_descriptor *descriptor; /* class descriptor */
70 struct usb_tt tt; /* Transaction Translator */
72 unsigned mA_per_port; /* current for each child */
74 unsigned limited_power:1;
76 unsigned disconnected:1;
78 unsigned has_indicators:1;
79 u8 indicator[USB_MAXCHILDREN];
80 struct delayed_work leds;
81 struct delayed_work init_work;
85 static inline int hub_is_superspeed(struct usb_device *hdev)
87 return (hdev->descriptor.bDeviceProtocol == 3);
90 /* Protect struct usb_device->state and ->children members
91 * Note: Both are also protected by ->dev.sem, except that ->state can
92 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
93 static DEFINE_SPINLOCK(device_state_lock);
95 /* khubd's worklist and its lock */
96 static DEFINE_SPINLOCK(hub_event_lock);
97 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
100 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
102 static struct task_struct *khubd_task;
104 /* cycle leds on hubs that aren't blinking for attention */
105 static int blinkenlights = 0;
106 module_param (blinkenlights, bool, S_IRUGO);
107 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
110 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
111 * 10 seconds to send reply for the initial 64-byte descriptor request.
113 /* define initial 64-byte descriptor request timeout in milliseconds */
114 static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
115 module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
116 MODULE_PARM_DESC(initial_descriptor_timeout,
117 "initial 64-byte descriptor request timeout in milliseconds "
118 "(default 5000 - 5.0 seconds)");
121 * As of 2.6.10 we introduce a new USB device initialization scheme which
122 * closely resembles the way Windows works. Hopefully it will be compatible
123 * with a wider range of devices than the old scheme. However some previously
124 * working devices may start giving rise to "device not accepting address"
125 * errors; if that happens the user can try the old scheme by adjusting the
126 * following module parameters.
128 * For maximum flexibility there are two boolean parameters to control the
129 * hub driver's behavior. On the first initialization attempt, if the
130 * "old_scheme_first" parameter is set then the old scheme will be used,
131 * otherwise the new scheme is used. If that fails and "use_both_schemes"
132 * is set, then the driver will make another attempt, using the other scheme.
134 static int old_scheme_first = 0;
135 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
136 MODULE_PARM_DESC(old_scheme_first,
137 "start with the old device initialization scheme");
139 static int use_both_schemes = 1;
140 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
141 MODULE_PARM_DESC(use_both_schemes,
142 "try the other device initialization scheme if the "
145 /* Mutual exclusion for EHCI CF initialization. This interferes with
146 * port reset on some companion controllers.
148 DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
149 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
151 #define HUB_DEBOUNCE_TIMEOUT 1500
152 #define HUB_DEBOUNCE_STEP 25
153 #define HUB_DEBOUNCE_STABLE 100
156 static int usb_reset_and_verify_device(struct usb_device *udev);
158 static inline char *portspeed(int portstatus)
160 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
162 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
164 else if (portstatus & USB_PORT_STAT_SUPER_SPEED)
170 /* Note that hdev or one of its children must be locked! */
171 static struct usb_hub *hdev_to_hub(struct usb_device *hdev)
173 if (!hdev || !hdev->actconfig)
175 return usb_get_intfdata(hdev->actconfig->interface[0]);
178 /* USB 2.0 spec Section 11.24.4.5 */
179 static int get_hub_descriptor(struct usb_device *hdev, void *data)
184 if (hub_is_superspeed(hdev)) {
185 dtype = USB_DT_SS_HUB;
186 size = USB_DT_SS_HUB_SIZE;
189 size = sizeof(struct usb_hub_descriptor);
192 for (i = 0; i < 3; i++) {
193 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
194 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
195 dtype << 8, 0, data, size,
196 USB_CTRL_GET_TIMEOUT);
197 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
204 * USB 2.0 spec Section 11.24.2.1
206 static int clear_hub_feature(struct usb_device *hdev, int feature)
208 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
209 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
213 * USB 2.0 spec Section 11.24.2.2
215 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
217 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
218 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
223 * USB 2.0 spec Section 11.24.2.13
225 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
227 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
228 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
233 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
234 * for info about using port indicators
236 static void set_port_led(
242 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
243 USB_PORT_FEAT_INDICATOR);
245 dev_dbg (hub->intfdev,
246 "port %d indicator %s status %d\n",
248 ({ char *s; switch (selector) {
249 case HUB_LED_AMBER: s = "amber"; break;
250 case HUB_LED_GREEN: s = "green"; break;
251 case HUB_LED_OFF: s = "off"; break;
252 case HUB_LED_AUTO: s = "auto"; break;
253 default: s = "??"; break;
258 #define LED_CYCLE_PERIOD ((2*HZ)/3)
260 static void led_work (struct work_struct *work)
262 struct usb_hub *hub =
263 container_of(work, struct usb_hub, leds.work);
264 struct usb_device *hdev = hub->hdev;
266 unsigned changed = 0;
269 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
272 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
273 unsigned selector, mode;
275 /* 30%-50% duty cycle */
277 switch (hub->indicator[i]) {
279 case INDICATOR_CYCLE:
281 selector = HUB_LED_AUTO;
282 mode = INDICATOR_AUTO;
284 /* blinking green = sw attention */
285 case INDICATOR_GREEN_BLINK:
286 selector = HUB_LED_GREEN;
287 mode = INDICATOR_GREEN_BLINK_OFF;
289 case INDICATOR_GREEN_BLINK_OFF:
290 selector = HUB_LED_OFF;
291 mode = INDICATOR_GREEN_BLINK;
293 /* blinking amber = hw attention */
294 case INDICATOR_AMBER_BLINK:
295 selector = HUB_LED_AMBER;
296 mode = INDICATOR_AMBER_BLINK_OFF;
298 case INDICATOR_AMBER_BLINK_OFF:
299 selector = HUB_LED_OFF;
300 mode = INDICATOR_AMBER_BLINK;
302 /* blink green/amber = reserved */
303 case INDICATOR_ALT_BLINK:
304 selector = HUB_LED_GREEN;
305 mode = INDICATOR_ALT_BLINK_OFF;
307 case INDICATOR_ALT_BLINK_OFF:
308 selector = HUB_LED_AMBER;
309 mode = INDICATOR_ALT_BLINK;
314 if (selector != HUB_LED_AUTO)
316 set_port_led(hub, i + 1, selector);
317 hub->indicator[i] = mode;
319 if (!changed && blinkenlights) {
321 cursor %= hub->descriptor->bNbrPorts;
322 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
323 hub->indicator[cursor] = INDICATOR_CYCLE;
327 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
330 /* use a short timeout for hub/port status fetches */
331 #define USB_STS_TIMEOUT 1000
332 #define USB_STS_RETRIES 5
335 * USB 2.0 spec Section 11.24.2.6
337 static int get_hub_status(struct usb_device *hdev,
338 struct usb_hub_status *data)
340 int i, status = -ETIMEDOUT;
342 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
343 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
344 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
345 data, sizeof(*data), USB_STS_TIMEOUT);
351 * USB 2.0 spec Section 11.24.2.7
353 static int get_port_status(struct usb_device *hdev, int port1,
354 struct usb_port_status *data)
356 int i, status = -ETIMEDOUT;
358 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
359 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
360 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
361 data, sizeof(*data), USB_STS_TIMEOUT);
366 static int hub_port_status(struct usb_hub *hub, int port1,
367 u16 *status, u16 *change)
371 mutex_lock(&hub->status_mutex);
372 ret = get_port_status(hub->hdev, port1, &hub->status->port);
374 dev_err(hub->intfdev,
375 "%s failed (err = %d)\n", __func__, ret);
379 *status = le16_to_cpu(hub->status->port.wPortStatus);
380 *change = le16_to_cpu(hub->status->port.wPortChange);
382 if ((hub->hdev->parent != NULL) &&
383 hub_is_superspeed(hub->hdev)) {
384 /* Translate the USB 3 port status */
385 u16 tmp = *status & USB_SS_PORT_STAT_MASK;
386 if (*status & USB_SS_PORT_STAT_POWER)
387 tmp |= USB_PORT_STAT_POWER;
388 if ((*status & USB_SS_PORT_STAT_SPEED) ==
389 USB_PORT_STAT_SPEED_5GBPS)
390 tmp |= USB_PORT_STAT_SUPER_SPEED;
396 mutex_unlock(&hub->status_mutex);
400 static void kick_khubd(struct usb_hub *hub)
404 spin_lock_irqsave(&hub_event_lock, flags);
405 if (!hub->disconnected && list_empty(&hub->event_list)) {
406 list_add_tail(&hub->event_list, &hub_event_list);
408 /* Suppress autosuspend until khubd runs */
409 usb_autopm_get_interface_no_resume(
410 to_usb_interface(hub->intfdev));
411 wake_up(&khubd_wait);
413 spin_unlock_irqrestore(&hub_event_lock, flags);
416 void usb_kick_khubd(struct usb_device *hdev)
418 struct usb_hub *hub = hdev_to_hub(hdev);
425 /* completion function, fires on port status changes and various faults */
426 static void hub_irq(struct urb *urb)
428 struct usb_hub *hub = urb->context;
429 int status = urb->status;
434 case -ENOENT: /* synchronous unlink */
435 case -ECONNRESET: /* async unlink */
436 case -ESHUTDOWN: /* hardware going away */
439 default: /* presumably an error */
440 /* Cause a hub reset after 10 consecutive errors */
441 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
442 if ((++hub->nerrors < 10) || hub->error)
447 /* let khubd handle things */
448 case 0: /* we got data: port status changed */
450 for (i = 0; i < urb->actual_length; ++i)
451 bits |= ((unsigned long) ((*hub->buffer)[i]))
453 hub->event_bits[0] = bits;
459 /* Something happened, let khubd figure it out */
466 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
467 && status != -ENODEV && status != -EPERM)
468 dev_err (hub->intfdev, "resubmit --> %d\n", status);
471 /* USB 2.0 spec Section 11.24.2.3 */
473 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
475 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
476 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
481 * enumeration blocks khubd for a long time. we use keventd instead, since
482 * long blocking there is the exception, not the rule. accordingly, HCDs
483 * talking to TTs must queue control transfers (not just bulk and iso), so
484 * both can talk to the same hub concurrently.
486 static void hub_tt_work(struct work_struct *work)
488 struct usb_hub *hub =
489 container_of(work, struct usb_hub, tt.clear_work);
493 spin_lock_irqsave (&hub->tt.lock, flags);
494 while (--limit && !list_empty (&hub->tt.clear_list)) {
495 struct list_head *next;
496 struct usb_tt_clear *clear;
497 struct usb_device *hdev = hub->hdev;
498 const struct hc_driver *drv;
501 next = hub->tt.clear_list.next;
502 clear = list_entry (next, struct usb_tt_clear, clear_list);
503 list_del (&clear->clear_list);
505 /* drop lock so HCD can concurrently report other TT errors */
506 spin_unlock_irqrestore (&hub->tt.lock, flags);
507 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
510 "clear tt %d (%04x) error %d\n",
511 clear->tt, clear->devinfo, status);
513 /* Tell the HCD, even if the operation failed */
514 drv = clear->hcd->driver;
515 if (drv->clear_tt_buffer_complete)
516 (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
519 spin_lock_irqsave(&hub->tt.lock, flags);
521 spin_unlock_irqrestore (&hub->tt.lock, flags);
525 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
526 * @urb: an URB associated with the failed or incomplete split transaction
528 * High speed HCDs use this to tell the hub driver that some split control or
529 * bulk transaction failed in a way that requires clearing internal state of
530 * a transaction translator. This is normally detected (and reported) from
533 * It may not be possible for that hub to handle additional full (or low)
534 * speed transactions until that state is fully cleared out.
536 int usb_hub_clear_tt_buffer(struct urb *urb)
538 struct usb_device *udev = urb->dev;
539 int pipe = urb->pipe;
540 struct usb_tt *tt = udev->tt;
542 struct usb_tt_clear *clear;
544 /* we've got to cope with an arbitrary number of pending TT clears,
545 * since each TT has "at least two" buffers that can need it (and
546 * there can be many TTs per hub). even if they're uncommon.
548 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
549 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
550 /* FIXME recover somehow ... RESET_TT? */
554 /* info that CLEAR_TT_BUFFER needs */
555 clear->tt = tt->multi ? udev->ttport : 1;
556 clear->devinfo = usb_pipeendpoint (pipe);
557 clear->devinfo |= udev->devnum << 4;
558 clear->devinfo |= usb_pipecontrol (pipe)
559 ? (USB_ENDPOINT_XFER_CONTROL << 11)
560 : (USB_ENDPOINT_XFER_BULK << 11);
561 if (usb_pipein (pipe))
562 clear->devinfo |= 1 << 15;
564 /* info for completion callback */
565 clear->hcd = bus_to_hcd(udev->bus);
568 /* tell keventd to clear state for this TT */
569 spin_lock_irqsave (&tt->lock, flags);
570 list_add_tail (&clear->clear_list, &tt->clear_list);
571 schedule_work(&tt->clear_work);
572 spin_unlock_irqrestore (&tt->lock, flags);
575 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
577 /* If do_delay is false, return the number of milliseconds the caller
580 static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
583 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
585 u16 wHubCharacteristics =
586 le16_to_cpu(hub->descriptor->wHubCharacteristics);
588 /* Enable power on each port. Some hubs have reserved values
589 * of LPSM (> 2) in their descriptors, even though they are
590 * USB 2.0 hubs. Some hubs do not implement port-power switching
591 * but only emulate it. In all cases, the ports won't work
592 * unless we send these messages to the hub.
594 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
595 dev_dbg(hub->intfdev, "enabling power on all ports\n");
597 dev_dbg(hub->intfdev, "trying to enable port power on "
598 "non-switchable hub\n");
599 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
600 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
602 /* Wait at least 100 msec for power to become stable */
603 delay = max(pgood_delay, (unsigned) 100);
609 static int hub_hub_status(struct usb_hub *hub,
610 u16 *status, u16 *change)
614 mutex_lock(&hub->status_mutex);
615 ret = get_hub_status(hub->hdev, &hub->status->hub);
617 dev_err (hub->intfdev,
618 "%s failed (err = %d)\n", __func__, ret);
620 *status = le16_to_cpu(hub->status->hub.wHubStatus);
621 *change = le16_to_cpu(hub->status->hub.wHubChange);
624 mutex_unlock(&hub->status_mutex);
628 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
630 struct usb_device *hdev = hub->hdev;
633 if (hdev->children[port1-1] && set_state)
634 usb_set_device_state(hdev->children[port1-1],
635 USB_STATE_NOTATTACHED);
636 if (!hub->error && !hub_is_superspeed(hub->hdev))
637 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
639 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
645 * Disable a port and mark a logical connect-change event, so that some
646 * time later khubd will disconnect() any existing usb_device on the port
647 * and will re-enumerate if there actually is a device attached.
649 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
651 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
652 hub_port_disable(hub, port1, 1);
654 /* FIXME let caller ask to power down the port:
655 * - some devices won't enumerate without a VBUS power cycle
656 * - SRP saves power that way
657 * - ... new call, TBD ...
658 * That's easy if this hub can switch power per-port, and
659 * khubd reactivates the port later (timer, SRP, etc).
660 * Powerdown must be optional, because of reset/DFU.
663 set_bit(port1, hub->change_bits);
668 * usb_remove_device - disable a device's port on its parent hub
669 * @udev: device to be disabled and removed
670 * Context: @udev locked, must be able to sleep.
672 * After @udev's port has been disabled, khubd is notified and it will
673 * see that the device has been disconnected. When the device is
674 * physically unplugged and something is plugged in, the events will
675 * be received and processed normally.
677 int usb_remove_device(struct usb_device *udev)
680 struct usb_interface *intf;
682 if (!udev->parent) /* Can't remove a root hub */
684 hub = hdev_to_hub(udev->parent);
685 intf = to_usb_interface(hub->intfdev);
687 usb_autopm_get_interface(intf);
688 set_bit(udev->portnum, hub->removed_bits);
689 hub_port_logical_disconnect(hub, udev->portnum);
690 usb_autopm_put_interface(intf);
694 enum hub_activation_type {
695 HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */
696 HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
699 static void hub_init_func2(struct work_struct *ws);
700 static void hub_init_func3(struct work_struct *ws);
702 static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
704 struct usb_device *hdev = hub->hdev;
709 bool need_debounce_delay = false;
712 /* Continue a partial initialization */
713 if (type == HUB_INIT2)
715 if (type == HUB_INIT3)
718 /* After a resume, port power should still be on.
719 * For any other type of activation, turn it on.
721 if (type != HUB_RESUME) {
723 /* Speed up system boot by using a delayed_work for the
724 * hub's initial power-up delays. This is pretty awkward
725 * and the implementation looks like a home-brewed sort of
726 * setjmp/longjmp, but it saves at least 100 ms for each
727 * root hub (assuming usbcore is compiled into the kernel
728 * rather than as a module). It adds up.
730 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
731 * because for those activation types the ports have to be
732 * operational when we return. In theory this could be done
733 * for HUB_POST_RESET, but it's easier not to.
735 if (type == HUB_INIT) {
736 delay = hub_power_on(hub, false);
737 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
738 schedule_delayed_work(&hub->init_work,
739 msecs_to_jiffies(delay));
741 /* Suppress autosuspend until init is done */
742 usb_autopm_get_interface_no_resume(
743 to_usb_interface(hub->intfdev));
744 return; /* Continues at init2: below */
745 } else if (type == HUB_RESET_RESUME) {
746 /* The internal host controller state for the hub device
747 * may be gone after a host power loss on system resume.
748 * Update the device's info so the HW knows it's a hub.
750 hcd = bus_to_hcd(hdev->bus);
751 if (hcd->driver->update_hub_device) {
752 ret = hcd->driver->update_hub_device(hcd, hdev,
755 dev_err(hub->intfdev, "Host not "
756 "accepting hub info "
758 dev_err(hub->intfdev, "LS/FS devices "
759 "and hubs may not work "
760 "under this hub\n.");
763 hub_power_on(hub, true);
765 hub_power_on(hub, true);
770 /* Check each port and set hub->change_bits to let khubd know
771 * which ports need attention.
773 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
774 struct usb_device *udev = hdev->children[port1-1];
775 u16 portstatus, portchange;
777 portstatus = portchange = 0;
778 status = hub_port_status(hub, port1, &portstatus, &portchange);
779 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
780 dev_dbg(hub->intfdev,
781 "port %d: status %04x change %04x\n",
782 port1, portstatus, portchange);
784 /* After anything other than HUB_RESUME (i.e., initialization
785 * or any sort of reset), every port should be disabled.
786 * Unconnected ports should likewise be disabled (paranoia),
787 * and so should ports for which we have no usb_device.
789 if ((portstatus & USB_PORT_STAT_ENABLE) && (
790 type != HUB_RESUME ||
791 !(portstatus & USB_PORT_STAT_CONNECTION) ||
793 udev->state == USB_STATE_NOTATTACHED)) {
795 * USB3 protocol ports will automatically transition
796 * to Enabled state when detect an USB3.0 device attach.
797 * Do not disable USB3 protocol ports.
798 * FIXME: USB3 root hub and external hubs are treated
801 if (hdev->descriptor.bDeviceProtocol != 3 ||
803 !(portstatus & USB_PORT_STAT_SUPER_SPEED))) {
804 clear_port_feature(hdev, port1,
805 USB_PORT_FEAT_ENABLE);
806 portstatus &= ~USB_PORT_STAT_ENABLE;
808 /* Pretend that power was lost for USB3 devs */
809 portstatus &= ~USB_PORT_STAT_ENABLE;
813 /* Clear status-change flags; we'll debounce later */
814 if (portchange & USB_PORT_STAT_C_CONNECTION) {
815 need_debounce_delay = true;
816 clear_port_feature(hub->hdev, port1,
817 USB_PORT_FEAT_C_CONNECTION);
819 if (portchange & USB_PORT_STAT_C_ENABLE) {
820 need_debounce_delay = true;
821 clear_port_feature(hub->hdev, port1,
822 USB_PORT_FEAT_C_ENABLE);
824 if (portchange & USB_PORT_STAT_C_LINK_STATE) {
825 need_debounce_delay = true;
826 clear_port_feature(hub->hdev, port1,
827 USB_PORT_FEAT_C_PORT_LINK_STATE);
830 /* We can forget about a "removed" device when there's a
831 * physical disconnect or the connect status changes.
833 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
834 (portchange & USB_PORT_STAT_C_CONNECTION))
835 clear_bit(port1, hub->removed_bits);
837 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
838 /* Tell khubd to disconnect the device or
839 * check for a new connection
841 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
842 set_bit(port1, hub->change_bits);
844 } else if (portstatus & USB_PORT_STAT_ENABLE) {
845 /* The power session apparently survived the resume.
846 * If there was an overcurrent or suspend change
847 * (i.e., remote wakeup request), have khubd
851 set_bit(port1, hub->change_bits);
853 } else if (udev->persist_enabled) {
855 udev->reset_resume = 1;
857 set_bit(port1, hub->change_bits);
860 /* The power session is gone; tell khubd */
861 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
862 set_bit(port1, hub->change_bits);
866 /* If no port-status-change flags were set, we don't need any
867 * debouncing. If flags were set we can try to debounce the
868 * ports all at once right now, instead of letting khubd do them
869 * one at a time later on.
871 * If any port-status changes do occur during this delay, khubd
872 * will see them later and handle them normally.
874 if (need_debounce_delay) {
875 delay = HUB_DEBOUNCE_STABLE;
877 /* Don't do a long sleep inside a workqueue routine */
878 if (type == HUB_INIT2) {
879 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
880 schedule_delayed_work(&hub->init_work,
881 msecs_to_jiffies(delay));
882 return; /* Continues at init3: below */
890 status = usb_submit_urb(hub->urb, GFP_NOIO);
892 dev_err(hub->intfdev, "activate --> %d\n", status);
893 if (hub->has_indicators && blinkenlights)
894 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
896 /* Scan all ports that need attention */
899 /* Allow autosuspend if it was suppressed */
900 if (type <= HUB_INIT3)
901 usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
904 /* Implement the continuations for the delays above */
905 static void hub_init_func2(struct work_struct *ws)
907 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
909 hub_activate(hub, HUB_INIT2);
912 static void hub_init_func3(struct work_struct *ws)
914 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
916 hub_activate(hub, HUB_INIT3);
919 enum hub_quiescing_type {
920 HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
923 static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
925 struct usb_device *hdev = hub->hdev;
928 cancel_delayed_work_sync(&hub->init_work);
930 /* khubd and related activity won't re-trigger */
933 if (type != HUB_SUSPEND) {
934 /* Disconnect all the children */
935 for (i = 0; i < hdev->maxchild; ++i) {
936 if (hdev->children[i])
937 usb_disconnect(&hdev->children[i]);
941 /* Stop khubd and related activity */
942 usb_kill_urb(hub->urb);
943 if (hub->has_indicators)
944 cancel_delayed_work_sync(&hub->leds);
946 cancel_work_sync(&hub->tt.clear_work);
949 /* caller has locked the hub device */
950 static int hub_pre_reset(struct usb_interface *intf)
952 struct usb_hub *hub = usb_get_intfdata(intf);
954 hub_quiesce(hub, HUB_PRE_RESET);
958 /* caller has locked the hub device */
959 static int hub_post_reset(struct usb_interface *intf)
961 struct usb_hub *hub = usb_get_intfdata(intf);
963 hub_activate(hub, HUB_POST_RESET);
967 static int hub_configure(struct usb_hub *hub,
968 struct usb_endpoint_descriptor *endpoint)
971 struct usb_device *hdev = hub->hdev;
972 struct device *hub_dev = hub->intfdev;
973 u16 hubstatus, hubchange;
974 u16 wHubCharacteristics;
977 char *message = "out of memory";
979 hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
985 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
990 mutex_init(&hub->status_mutex);
992 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
993 if (!hub->descriptor) {
998 if (hub_is_superspeed(hdev) && (hdev->parent != NULL)) {
999 ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
1000 HUB_SET_DEPTH, USB_RT_HUB,
1001 hdev->level - 1, 0, NULL, 0,
1002 USB_CTRL_SET_TIMEOUT);
1005 message = "can't set hub depth";
1010 /* Request the entire hub descriptor.
1011 * hub->descriptor can handle USB_MAXCHILDREN ports,
1012 * but the hub can/will return fewer bytes here.
1014 ret = get_hub_descriptor(hdev, hub->descriptor);
1016 message = "can't read hub descriptor";
1018 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
1019 message = "hub has too many ports!";
1024 hdev->maxchild = hub->descriptor->bNbrPorts;
1025 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
1026 (hdev->maxchild == 1) ? "" : "s");
1028 hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL);
1029 if (!hub->port_owners) {
1034 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1036 /* FIXME for USB 3.0, skip for now */
1037 if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
1038 !(hub_is_superspeed(hdev))) {
1040 char portstr [USB_MAXCHILDREN + 1];
1042 for (i = 0; i < hdev->maxchild; i++)
1043 portstr[i] = hub->descriptor->u.hs.DeviceRemovable
1044 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
1046 portstr[hdev->maxchild] = 0;
1047 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
1049 dev_dbg(hub_dev, "standalone hub\n");
1051 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1053 dev_dbg(hub_dev, "ganged power switching\n");
1056 dev_dbg(hub_dev, "individual port power switching\n");
1060 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
1064 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1066 dev_dbg(hub_dev, "global over-current protection\n");
1069 dev_dbg(hub_dev, "individual port over-current protection\n");
1073 dev_dbg(hub_dev, "no over-current protection\n");
1077 spin_lock_init (&hub->tt.lock);
1078 INIT_LIST_HEAD (&hub->tt.clear_list);
1079 INIT_WORK(&hub->tt.clear_work, hub_tt_work);
1080 switch (hdev->descriptor.bDeviceProtocol) {
1084 dev_dbg(hub_dev, "Single TT\n");
1088 ret = usb_set_interface(hdev, 0, 1);
1090 dev_dbg(hub_dev, "TT per port\n");
1093 dev_err(hub_dev, "Using single TT (err %d)\n",
1098 /* USB 3.0 hubs don't have a TT */
1101 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
1102 hdev->descriptor.bDeviceProtocol);
1106 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1107 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
1108 case HUB_TTTT_8_BITS:
1109 if (hdev->descriptor.bDeviceProtocol != 0) {
1110 hub->tt.think_time = 666;
1111 dev_dbg(hub_dev, "TT requires at most %d "
1112 "FS bit times (%d ns)\n",
1113 8, hub->tt.think_time);
1116 case HUB_TTTT_16_BITS:
1117 hub->tt.think_time = 666 * 2;
1118 dev_dbg(hub_dev, "TT requires at most %d "
1119 "FS bit times (%d ns)\n",
1120 16, hub->tt.think_time);
1122 case HUB_TTTT_24_BITS:
1123 hub->tt.think_time = 666 * 3;
1124 dev_dbg(hub_dev, "TT requires at most %d "
1125 "FS bit times (%d ns)\n",
1126 24, hub->tt.think_time);
1128 case HUB_TTTT_32_BITS:
1129 hub->tt.think_time = 666 * 4;
1130 dev_dbg(hub_dev, "TT requires at most %d "
1131 "FS bit times (%d ns)\n",
1132 32, hub->tt.think_time);
1136 /* probe() zeroes hub->indicator[] */
1137 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1138 hub->has_indicators = 1;
1139 dev_dbg(hub_dev, "Port indicators are supported\n");
1142 dev_dbg(hub_dev, "power on to power good time: %dms\n",
1143 hub->descriptor->bPwrOn2PwrGood * 2);
1145 /* power budgeting mostly matters with bus-powered hubs,
1146 * and battery-powered root hubs (may provide just 8 mA).
1148 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
1150 message = "can't get hub status";
1153 le16_to_cpus(&hubstatus);
1154 if (hdev == hdev->bus->root_hub) {
1155 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
1156 hub->mA_per_port = 500;
1158 hub->mA_per_port = hdev->bus_mA;
1159 hub->limited_power = 1;
1161 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1162 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
1163 hub->descriptor->bHubContrCurrent);
1164 hub->limited_power = 1;
1165 if (hdev->maxchild > 0) {
1166 int remaining = hdev->bus_mA -
1167 hub->descriptor->bHubContrCurrent;
1169 if (remaining < hdev->maxchild * 100)
1171 "insufficient power available "
1172 "to use all downstream ports\n");
1173 hub->mA_per_port = 100; /* 7.2.1.1 */
1175 } else { /* Self-powered external hub */
1176 /* FIXME: What about battery-powered external hubs that
1177 * provide less current per port? */
1178 hub->mA_per_port = 500;
1180 if (hub->mA_per_port < 500)
1181 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
1184 /* Update the HCD's internal representation of this hub before khubd
1185 * starts getting port status changes for devices under the hub.
1187 hcd = bus_to_hcd(hdev->bus);
1188 if (hcd->driver->update_hub_device) {
1189 ret = hcd->driver->update_hub_device(hcd, hdev,
1190 &hub->tt, GFP_KERNEL);
1192 message = "can't update HCD hub info";
1197 ret = hub_hub_status(hub, &hubstatus, &hubchange);
1199 message = "can't get hub status";
1203 /* local power status reports aren't always correct */
1204 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1205 dev_dbg(hub_dev, "local power source is %s\n",
1206 (hubstatus & HUB_STATUS_LOCAL_POWER)
1207 ? "lost (inactive)" : "good");
1209 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1210 dev_dbg(hub_dev, "%sover-current condition exists\n",
1211 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1213 /* set up the interrupt endpoint
1214 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1215 * bytes as USB2.0[11.12.3] says because some hubs are known
1216 * to send more data (and thus cause overflow). For root hubs,
1217 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1218 * to be big enough for at least USB_MAXCHILDREN ports. */
1219 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
1220 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
1222 if (maxp > sizeof(*hub->buffer))
1223 maxp = sizeof(*hub->buffer);
1225 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
1231 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
1232 hub, endpoint->bInterval);
1234 /* maybe cycle the hub leds */
1235 if (hub->has_indicators && blinkenlights)
1236 hub->indicator [0] = INDICATOR_CYCLE;
1238 hub_activate(hub, HUB_INIT);
1242 dev_err (hub_dev, "config failed, %s (err %d)\n",
1244 /* hub_disconnect() frees urb and descriptor */
1248 static void hub_release(struct kref *kref)
1250 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1252 usb_put_intf(to_usb_interface(hub->intfdev));
1256 static unsigned highspeed_hubs;
1258 static void hub_disconnect(struct usb_interface *intf)
1260 struct usb_hub *hub = usb_get_intfdata (intf);
1262 /* Take the hub off the event list and don't let it be added again */
1263 spin_lock_irq(&hub_event_lock);
1264 if (!list_empty(&hub->event_list)) {
1265 list_del_init(&hub->event_list);
1266 usb_autopm_put_interface_no_suspend(intf);
1268 hub->disconnected = 1;
1269 spin_unlock_irq(&hub_event_lock);
1271 /* Disconnect all children and quiesce the hub */
1273 hub_quiesce(hub, HUB_DISCONNECT);
1275 usb_set_intfdata (intf, NULL);
1276 hub->hdev->maxchild = 0;
1278 if (hub->hdev->speed == USB_SPEED_HIGH)
1281 usb_free_urb(hub->urb);
1282 kfree(hub->port_owners);
1283 kfree(hub->descriptor);
1287 kref_put(&hub->kref, hub_release);
1290 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1292 struct usb_host_interface *desc;
1293 struct usb_endpoint_descriptor *endpoint;
1294 struct usb_device *hdev;
1295 struct usb_hub *hub;
1297 desc = intf->cur_altsetting;
1298 hdev = interface_to_usbdev(intf);
1300 /* Hubs have proper suspend/resume support */
1301 usb_enable_autosuspend(hdev);
1303 if (hdev->level == MAX_TOPO_LEVEL) {
1305 "Unsupported bus topology: hub nested too deep\n");
1309 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1311 dev_warn(&intf->dev, "ignoring external hub\n");
1316 /* Some hubs have a subclass of 1, which AFAICT according to the */
1317 /* specs is not defined, but it works */
1318 if ((desc->desc.bInterfaceSubClass != 0) &&
1319 (desc->desc.bInterfaceSubClass != 1)) {
1321 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1325 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1326 if (desc->desc.bNumEndpoints != 1)
1327 goto descriptor_error;
1329 endpoint = &desc->endpoint[0].desc;
1331 /* If it's not an interrupt in endpoint, we'd better punt! */
1332 if (!usb_endpoint_is_int_in(endpoint))
1333 goto descriptor_error;
1335 /* We found a hub */
1336 dev_info (&intf->dev, "USB hub found\n");
1338 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1340 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1344 kref_init(&hub->kref);
1345 INIT_LIST_HEAD(&hub->event_list);
1346 hub->intfdev = &intf->dev;
1348 INIT_DELAYED_WORK(&hub->leds, led_work);
1349 INIT_DELAYED_WORK(&hub->init_work, NULL);
1352 usb_set_intfdata (intf, hub);
1353 intf->needs_remote_wakeup = 1;
1355 if (hdev->speed == USB_SPEED_HIGH)
1358 if (hub_configure(hub, endpoint) >= 0)
1361 hub_disconnect (intf);
1367 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1369 struct usb_device *hdev = interface_to_usbdev (intf);
1371 /* assert ifno == 0 (part of hub spec) */
1373 case USBDEVFS_HUB_PORTINFO: {
1374 struct usbdevfs_hub_portinfo *info = user_data;
1377 spin_lock_irq(&device_state_lock);
1378 if (hdev->devnum <= 0)
1381 info->nports = hdev->maxchild;
1382 for (i = 0; i < info->nports; i++) {
1383 if (hdev->children[i] == NULL)
1387 hdev->children[i]->devnum;
1390 spin_unlock_irq(&device_state_lock);
1392 return info->nports + 1;
1401 * Allow user programs to claim ports on a hub. When a device is attached
1402 * to one of these "claimed" ports, the program will "own" the device.
1404 static int find_port_owner(struct usb_device *hdev, unsigned port1,
1407 if (hdev->state == USB_STATE_NOTATTACHED)
1409 if (port1 == 0 || port1 > hdev->maxchild)
1412 /* This assumes that devices not managed by the hub driver
1413 * will always have maxchild equal to 0.
1415 *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]);
1419 /* In the following three functions, the caller must hold hdev's lock */
1420 int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner)
1425 rc = find_port_owner(hdev, port1, &powner);
1434 int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner)
1439 rc = find_port_owner(hdev, port1, &powner);
1442 if (*powner != owner)
1448 void usb_hub_release_all_ports(struct usb_device *hdev, void *owner)
1453 n = find_port_owner(hdev, 1, &powner);
1455 for (; n < hdev->maxchild; (++n, ++powner)) {
1456 if (*powner == owner)
1462 /* The caller must hold udev's lock */
1463 bool usb_device_is_owned(struct usb_device *udev)
1465 struct usb_hub *hub;
1467 if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
1469 hub = hdev_to_hub(udev->parent);
1470 return !!hub->port_owners[udev->portnum - 1];
1474 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1478 for (i = 0; i < udev->maxchild; ++i) {
1479 if (udev->children[i])
1480 recursively_mark_NOTATTACHED(udev->children[i]);
1482 if (udev->state == USB_STATE_SUSPENDED)
1483 udev->active_duration -= jiffies;
1484 udev->state = USB_STATE_NOTATTACHED;
1488 * usb_set_device_state - change a device's current state (usbcore, hcds)
1489 * @udev: pointer to device whose state should be changed
1490 * @new_state: new state value to be stored
1492 * udev->state is _not_ fully protected by the device lock. Although
1493 * most transitions are made only while holding the lock, the state can
1494 * can change to USB_STATE_NOTATTACHED at almost any time. This
1495 * is so that devices can be marked as disconnected as soon as possible,
1496 * without having to wait for any semaphores to be released. As a result,
1497 * all changes to any device's state must be protected by the
1498 * device_state_lock spinlock.
1500 * Once a device has been added to the device tree, all changes to its state
1501 * should be made using this routine. The state should _not_ be set directly.
1503 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1504 * Otherwise udev->state is set to new_state, and if new_state is
1505 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1506 * to USB_STATE_NOTATTACHED.
1508 void usb_set_device_state(struct usb_device *udev,
1509 enum usb_device_state new_state)
1511 unsigned long flags;
1513 spin_lock_irqsave(&device_state_lock, flags);
1514 if (udev->state == USB_STATE_NOTATTACHED)
1516 else if (new_state != USB_STATE_NOTATTACHED) {
1518 /* root hub wakeup capabilities are managed out-of-band
1519 * and may involve silicon errata ... ignore them here.
1522 if (udev->state == USB_STATE_SUSPENDED
1523 || new_state == USB_STATE_SUSPENDED)
1524 ; /* No change to wakeup settings */
1525 else if (new_state == USB_STATE_CONFIGURED)
1526 device_set_wakeup_capable(&udev->dev,
1527 (udev->actconfig->desc.bmAttributes
1528 & USB_CONFIG_ATT_WAKEUP));
1530 device_set_wakeup_capable(&udev->dev, 0);
1532 if (udev->state == USB_STATE_SUSPENDED &&
1533 new_state != USB_STATE_SUSPENDED)
1534 udev->active_duration -= jiffies;
1535 else if (new_state == USB_STATE_SUSPENDED &&
1536 udev->state != USB_STATE_SUSPENDED)
1537 udev->active_duration += jiffies;
1538 udev->state = new_state;
1540 recursively_mark_NOTATTACHED(udev);
1541 spin_unlock_irqrestore(&device_state_lock, flags);
1543 EXPORT_SYMBOL_GPL(usb_set_device_state);
1546 * Choose a device number.
1548 * Device numbers are used as filenames in usbfs. On USB-1.1 and
1549 * USB-2.0 buses they are also used as device addresses, however on
1550 * USB-3.0 buses the address is assigned by the controller hardware
1551 * and it usually is not the same as the device number.
1553 * WUSB devices are simple: they have no hubs behind, so the mapping
1554 * device <-> virtual port number becomes 1:1. Why? to simplify the
1555 * life of the device connection logic in
1556 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1557 * handshake we need to assign a temporary address in the unauthorized
1558 * space. For simplicity we use the first virtual port number found to
1559 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1560 * and that becomes it's address [X < 128] or its unauthorized address
1563 * We add 1 as an offset to the one-based USB-stack port number
1564 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1565 * 0 is reserved by USB for default address; (b) Linux's USB stack
1566 * uses always #1 for the root hub of the controller. So USB stack's
1567 * port #1, which is wusb virtual-port #0 has address #2.
1569 * Devices connected under xHCI are not as simple. The host controller
1570 * supports virtualization, so the hardware assigns device addresses and
1571 * the HCD must setup data structures before issuing a set address
1572 * command to the hardware.
1574 static void choose_devnum(struct usb_device *udev)
1577 struct usb_bus *bus = udev->bus;
1579 /* If khubd ever becomes multithreaded, this will need a lock */
1581 devnum = udev->portnum + 1;
1582 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1584 /* Try to allocate the next devnum beginning at
1585 * bus->devnum_next. */
1586 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1589 devnum = find_next_zero_bit(bus->devmap.devicemap,
1591 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1594 set_bit(devnum, bus->devmap.devicemap);
1595 udev->devnum = devnum;
1599 static void release_devnum(struct usb_device *udev)
1601 if (udev->devnum > 0) {
1602 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1607 static void update_devnum(struct usb_device *udev, int devnum)
1609 /* The address for a WUSB device is managed by wusbcore. */
1611 udev->devnum = devnum;
1614 static void hub_free_dev(struct usb_device *udev)
1616 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1618 /* Root hubs aren't real devices, so don't free HCD resources */
1619 if (hcd->driver->free_dev && udev->parent)
1620 hcd->driver->free_dev(hcd, udev);
1624 * usb_disconnect - disconnect a device (usbcore-internal)
1625 * @pdev: pointer to device being disconnected
1626 * Context: !in_interrupt ()
1628 * Something got disconnected. Get rid of it and all of its children.
1630 * If *pdev is a normal device then the parent hub must already be locked.
1631 * If *pdev is a root hub then this routine will acquire the
1632 * usb_bus_list_lock on behalf of the caller.
1634 * Only hub drivers (including virtual root hub drivers for host
1635 * controllers) should ever call this.
1637 * This call is synchronous, and may not be used in an interrupt context.
1639 void usb_disconnect(struct usb_device **pdev)
1641 struct usb_device *udev = *pdev;
1645 pr_debug ("%s nodev\n", __func__);
1649 /* mark the device as inactive, so any further urb submissions for
1650 * this device (and any of its children) will fail immediately.
1651 * this quiesces everyting except pending urbs.
1653 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1654 dev_info(&udev->dev, "USB disconnect, device number %d\n",
1657 usb_lock_device(udev);
1659 /* Free up all the children before we remove this device */
1660 for (i = 0; i < USB_MAXCHILDREN; i++) {
1661 if (udev->children[i])
1662 usb_disconnect(&udev->children[i]);
1665 /* deallocate hcd/hardware state ... nuking all pending urbs and
1666 * cleaning up all state associated with the current configuration
1667 * so that the hardware is now fully quiesced.
1669 dev_dbg (&udev->dev, "unregistering device\n");
1670 usb_disable_device(udev, 0);
1671 usb_hcd_synchronize_unlinks(udev);
1673 usb_remove_ep_devs(&udev->ep0);
1674 usb_unlock_device(udev);
1676 /* Unregister the device. The device driver is responsible
1677 * for de-configuring the device and invoking the remove-device
1678 * notifier chain (used by usbfs and possibly others).
1680 device_del(&udev->dev);
1682 /* Free the device number and delete the parent's children[]
1683 * (or root_hub) pointer.
1685 release_devnum(udev);
1687 /* Avoid races with recursively_mark_NOTATTACHED() */
1688 spin_lock_irq(&device_state_lock);
1690 spin_unlock_irq(&device_state_lock);
1694 put_device(&udev->dev);
1697 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1698 static void show_string(struct usb_device *udev, char *id, char *string)
1702 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1705 static void announce_device(struct usb_device *udev)
1707 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1708 le16_to_cpu(udev->descriptor.idVendor),
1709 le16_to_cpu(udev->descriptor.idProduct));
1710 dev_info(&udev->dev,
1711 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1712 udev->descriptor.iManufacturer,
1713 udev->descriptor.iProduct,
1714 udev->descriptor.iSerialNumber);
1715 show_string(udev, "Product", udev->product);
1716 show_string(udev, "Manufacturer", udev->manufacturer);
1717 show_string(udev, "SerialNumber", udev->serial);
1720 static inline void announce_device(struct usb_device *udev) { }
1723 #ifdef CONFIG_USB_OTG
1724 #include "otg_whitelist.h"
1728 * usb_enumerate_device_otg - FIXME (usbcore-internal)
1729 * @udev: newly addressed device (in ADDRESS state)
1731 * Finish enumeration for On-The-Go devices
1733 static int usb_enumerate_device_otg(struct usb_device *udev)
1737 #ifdef CONFIG_USB_OTG
1739 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1740 * to wake us after we've powered off VBUS; and HNP, switching roles
1741 * "host" to "peripheral". The OTG descriptor helps figure this out.
1743 if (!udev->bus->is_b_host
1745 && udev->parent == udev->bus->root_hub) {
1746 struct usb_otg_descriptor *desc = NULL;
1747 struct usb_bus *bus = udev->bus;
1749 /* descriptor may appear anywhere in config */
1750 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1751 le16_to_cpu(udev->config[0].desc.wTotalLength),
1752 USB_DT_OTG, (void **) &desc) == 0) {
1753 if (desc->bmAttributes & USB_OTG_HNP) {
1754 unsigned port1 = udev->portnum;
1756 dev_info(&udev->dev,
1757 "Dual-Role OTG device on %sHNP port\n",
1758 (port1 == bus->otg_port)
1761 /* enable HNP before suspend, it's simpler */
1762 if (port1 == bus->otg_port)
1763 bus->b_hnp_enable = 1;
1764 err = usb_control_msg(udev,
1765 usb_sndctrlpipe(udev, 0),
1766 USB_REQ_SET_FEATURE, 0,
1768 ? USB_DEVICE_B_HNP_ENABLE
1769 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1770 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1772 /* OTG MESSAGE: report errors here,
1773 * customize to match your product.
1775 dev_info(&udev->dev,
1776 "can't set HNP mode: %d\n",
1778 bus->b_hnp_enable = 0;
1784 if (!is_targeted(udev)) {
1786 /* Maybe it can talk to us, though we can't talk to it.
1787 * (Includes HNP test device.)
1789 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1790 err = usb_port_suspend(udev, PMSG_SUSPEND);
1792 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1804 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
1805 * @udev: newly addressed device (in ADDRESS state)
1807 * This is only called by usb_new_device() and usb_authorize_device()
1808 * and FIXME -- all comments that apply to them apply here wrt to
1811 * If the device is WUSB and not authorized, we don't attempt to read
1812 * the string descriptors, as they will be errored out by the device
1813 * until it has been authorized.
1815 static int usb_enumerate_device(struct usb_device *udev)
1819 if (udev->config == NULL) {
1820 err = usb_get_configuration(udev);
1822 dev_err(&udev->dev, "can't read configurations, error %d\n",
1827 if (udev->wusb == 1 && udev->authorized == 0) {
1828 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1829 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1830 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1833 /* read the standard strings and cache them if present */
1834 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1835 udev->manufacturer = usb_cache_string(udev,
1836 udev->descriptor.iManufacturer);
1837 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1839 err = usb_enumerate_device_otg(udev);
1846 * usb_new_device - perform initial device setup (usbcore-internal)
1847 * @udev: newly addressed device (in ADDRESS state)
1849 * This is called with devices which have been detected but not fully
1850 * enumerated. The device descriptor is available, but not descriptors
1851 * for any device configuration. The caller must have locked either
1852 * the parent hub (if udev is a normal device) or else the
1853 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1854 * udev has already been installed, but udev is not yet visible through
1855 * sysfs or other filesystem code.
1857 * It will return if the device is configured properly or not. Zero if
1858 * the interface was registered with the driver core; else a negative
1861 * This call is synchronous, and may not be used in an interrupt context.
1863 * Only the hub driver or root-hub registrar should ever call this.
1865 int usb_new_device(struct usb_device *udev)
1870 /* Initialize non-root-hub device wakeup to disabled;
1871 * device (un)configuration controls wakeup capable
1872 * sysfs power/wakeup controls wakeup enabled/disabled
1874 device_init_wakeup(&udev->dev, 0);
1877 /* Tell the runtime-PM framework the device is active */
1878 pm_runtime_set_active(&udev->dev);
1879 pm_runtime_get_noresume(&udev->dev);
1880 pm_runtime_use_autosuspend(&udev->dev);
1881 pm_runtime_enable(&udev->dev);
1883 /* By default, forbid autosuspend for all devices. It will be
1884 * allowed for hubs during binding.
1886 usb_disable_autosuspend(udev);
1888 err = usb_enumerate_device(udev); /* Read descriptors */
1891 dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
1892 udev->devnum, udev->bus->busnum,
1893 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1894 /* export the usbdev device-node for libusb */
1895 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1896 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1898 /* Tell the world! */
1899 announce_device(udev);
1901 device_enable_async_suspend(&udev->dev);
1902 /* Register the device. The device driver is responsible
1903 * for configuring the device and invoking the add-device
1904 * notifier chain (used by usbfs and possibly others).
1906 err = device_add(&udev->dev);
1908 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1912 (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
1913 usb_mark_last_busy(udev);
1914 pm_runtime_put_sync_autosuspend(&udev->dev);
1918 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1919 pm_runtime_disable(&udev->dev);
1920 pm_runtime_set_suspended(&udev->dev);
1926 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1927 * @usb_dev: USB device
1929 * Move the USB device to a very basic state where interfaces are disabled
1930 * and the device is in fact unconfigured and unusable.
1932 * We share a lock (that we have) with device_del(), so we need to
1935 int usb_deauthorize_device(struct usb_device *usb_dev)
1937 usb_lock_device(usb_dev);
1938 if (usb_dev->authorized == 0)
1939 goto out_unauthorized;
1941 usb_dev->authorized = 0;
1942 usb_set_configuration(usb_dev, -1);
1944 kfree(usb_dev->product);
1945 usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1946 kfree(usb_dev->manufacturer);
1947 usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1948 kfree(usb_dev->serial);
1949 usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1951 usb_destroy_configuration(usb_dev);
1952 usb_dev->descriptor.bNumConfigurations = 0;
1955 usb_unlock_device(usb_dev);
1960 int usb_authorize_device(struct usb_device *usb_dev)
1964 usb_lock_device(usb_dev);
1965 if (usb_dev->authorized == 1)
1966 goto out_authorized;
1968 result = usb_autoresume_device(usb_dev);
1970 dev_err(&usb_dev->dev,
1971 "can't autoresume for authorization: %d\n", result);
1972 goto error_autoresume;
1974 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1976 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1977 "authorization: %d\n", result);
1978 goto error_device_descriptor;
1981 kfree(usb_dev->product);
1982 usb_dev->product = NULL;
1983 kfree(usb_dev->manufacturer);
1984 usb_dev->manufacturer = NULL;
1985 kfree(usb_dev->serial);
1986 usb_dev->serial = NULL;
1988 usb_dev->authorized = 1;
1989 result = usb_enumerate_device(usb_dev);
1991 goto error_enumerate;
1992 /* Choose and set the configuration. This registers the interfaces
1993 * with the driver core and lets interface drivers bind to them.
1995 c = usb_choose_configuration(usb_dev);
1997 result = usb_set_configuration(usb_dev, c);
1999 dev_err(&usb_dev->dev,
2000 "can't set config #%d, error %d\n", c, result);
2001 /* This need not be fatal. The user can try to
2002 * set other configurations. */
2005 dev_info(&usb_dev->dev, "authorized to connect\n");
2008 error_device_descriptor:
2009 usb_autosuspend_device(usb_dev);
2012 usb_unlock_device(usb_dev); // complements locktree
2017 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2018 static unsigned hub_is_wusb(struct usb_hub *hub)
2020 struct usb_hcd *hcd;
2021 if (hub->hdev->parent != NULL) /* not a root hub? */
2023 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
2024 return hcd->wireless;
2028 #define PORT_RESET_TRIES 5
2029 #define SET_ADDRESS_TRIES 2
2030 #define GET_DESCRIPTOR_TRIES 2
2031 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2032 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
2034 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
2035 #define HUB_SHORT_RESET_TIME 10
2036 #define HUB_LONG_RESET_TIME 200
2037 #define HUB_RESET_TIMEOUT 500
2039 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
2040 struct usb_device *udev, unsigned int delay)
2042 int delay_time, ret;
2046 for (delay_time = 0;
2047 delay_time < HUB_RESET_TIMEOUT;
2048 delay_time += delay) {
2049 /* wait to give the device a chance to reset */
2052 /* read and decode port status */
2053 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2057 /* Device went away? */
2058 if (!(portstatus & USB_PORT_STAT_CONNECTION))
2061 /* bomb out completely if the connection bounced */
2062 if ((portchange & USB_PORT_STAT_C_CONNECTION))
2065 /* if we`ve finished resetting, then break out of the loop */
2066 if (!(portstatus & USB_PORT_STAT_RESET) &&
2067 (portstatus & USB_PORT_STAT_ENABLE)) {
2068 if (hub_is_wusb(hub))
2069 udev->speed = USB_SPEED_WIRELESS;
2070 else if (portstatus & USB_PORT_STAT_SUPER_SPEED)
2071 udev->speed = USB_SPEED_SUPER;
2072 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
2073 udev->speed = USB_SPEED_HIGH;
2074 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
2075 udev->speed = USB_SPEED_LOW;
2076 else if (portstatus & USB_PORT_STAT_SUPER_SPEED)
2077 udev->speed = USB_SPEED_SUPER;
2079 udev->speed = USB_SPEED_FULL;
2083 /* switch to the long delay after two short delay failures */
2084 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
2085 delay = HUB_LONG_RESET_TIME;
2087 dev_dbg (hub->intfdev,
2088 "port %d not reset yet, waiting %dms\n",
2095 static int hub_port_reset(struct usb_hub *hub, int port1,
2096 struct usb_device *udev, unsigned int delay)
2099 struct usb_hcd *hcd;
2101 hcd = bus_to_hcd(udev->bus);
2102 /* Block EHCI CF initialization during the port reset.
2103 * Some companion controllers don't like it when they mix.
2105 down_read(&ehci_cf_port_reset_rwsem);
2107 /* Reset the port */
2108 for (i = 0; i < PORT_RESET_TRIES; i++) {
2109 status = set_port_feature(hub->hdev,
2110 port1, USB_PORT_FEAT_RESET);
2112 dev_err(hub->intfdev,
2113 "cannot reset port %d (err = %d)\n",
2116 status = hub_port_wait_reset(hub, port1, udev, delay);
2117 if (status && status != -ENOTCONN)
2118 dev_dbg(hub->intfdev,
2119 "port_wait_reset: err = %d\n",
2123 /* return on disconnect or reset */
2126 /* TRSTRCY = 10 ms; plus some extra */
2128 update_devnum(udev, 0);
2129 if (hcd->driver->reset_device) {
2130 status = hcd->driver->reset_device(hcd, udev);
2132 dev_err(&udev->dev, "Cannot reset "
2133 "HCD device state\n");
2140 clear_port_feature(hub->hdev,
2141 port1, USB_PORT_FEAT_C_RESET);
2142 /* FIXME need disconnect() for NOTATTACHED device */
2143 usb_set_device_state(udev, status
2144 ? USB_STATE_NOTATTACHED
2145 : USB_STATE_DEFAULT);
2149 dev_dbg (hub->intfdev,
2150 "port %d not enabled, trying reset again...\n",
2152 delay = HUB_LONG_RESET_TIME;
2155 dev_err (hub->intfdev,
2156 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2160 up_read(&ehci_cf_port_reset_rwsem);
2166 #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
2167 USB_PORT_STAT_SUSPEND)
2168 #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
2170 /* Determine whether the device on a port is ready for a normal resume,
2171 * is ready for a reset-resume, or should be disconnected.
2173 static int check_port_resume_type(struct usb_device *udev,
2174 struct usb_hub *hub, int port1,
2175 int status, unsigned portchange, unsigned portstatus)
2177 /* Is the device still present? */
2178 if (status || (portstatus & MASK_BITS) != WANT_BITS) {
2183 /* Can't do a normal resume if the port isn't enabled,
2184 * so try a reset-resume instead.
2186 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
2187 if (udev->persist_enabled)
2188 udev->reset_resume = 1;
2194 dev_dbg(hub->intfdev,
2195 "port %d status %04x.%04x after resume, %d\n",
2196 port1, portchange, portstatus, status);
2197 } else if (udev->reset_resume) {
2199 /* Late port handoff can set status-change bits */
2200 if (portchange & USB_PORT_STAT_C_CONNECTION)
2201 clear_port_feature(hub->hdev, port1,
2202 USB_PORT_FEAT_C_CONNECTION);
2203 if (portchange & USB_PORT_STAT_C_ENABLE)
2204 clear_port_feature(hub->hdev, port1,
2205 USB_PORT_FEAT_C_ENABLE);
2211 #ifdef CONFIG_USB_SUSPEND
2214 * usb_port_suspend - suspend a usb device's upstream port
2215 * @udev: device that's no longer in active use, not a root hub
2216 * Context: must be able to sleep; device not locked; pm locks held
2218 * Suspends a USB device that isn't in active use, conserving power.
2219 * Devices may wake out of a suspend, if anything important happens,
2220 * using the remote wakeup mechanism. They may also be taken out of
2221 * suspend by the host, using usb_port_resume(). It's also routine
2222 * to disconnect devices while they are suspended.
2224 * This only affects the USB hardware for a device; its interfaces
2225 * (and, for hubs, child devices) must already have been suspended.
2227 * Selective port suspend reduces power; most suspended devices draw
2228 * less than 500 uA. It's also used in OTG, along with remote wakeup.
2229 * All devices below the suspended port are also suspended.
2231 * Devices leave suspend state when the host wakes them up. Some devices
2232 * also support "remote wakeup", where the device can activate the USB
2233 * tree above them to deliver data, such as a keypress or packet. In
2234 * some cases, this wakes the USB host.
2236 * Suspending OTG devices may trigger HNP, if that's been enabled
2237 * between a pair of dual-role devices. That will change roles, such
2238 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2240 * Devices on USB hub ports have only one "suspend" state, corresponding
2241 * to ACPI D2, "may cause the device to lose some context".
2242 * State transitions include:
2244 * - suspend, resume ... when the VBUS power link stays live
2245 * - suspend, disconnect ... VBUS lost
2247 * Once VBUS drop breaks the circuit, the port it's using has to go through
2248 * normal re-enumeration procedures, starting with enabling VBUS power.
2249 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2250 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
2251 * timer, no SRP, no requests through sysfs.
2253 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
2254 * the root hub for their bus goes into global suspend ... so we don't
2255 * (falsely) update the device power state to say it suspended.
2257 * Returns 0 on success, else negative errno.
2259 int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
2261 struct usb_hub *hub = hdev_to_hub(udev->parent);
2262 int port1 = udev->portnum;
2265 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
2267 /* enable remote wakeup when appropriate; this lets the device
2268 * wake up the upstream hub (including maybe the root hub).
2270 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
2271 * we don't explicitly enable it here.
2273 if (udev->do_remote_wakeup) {
2274 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2275 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
2276 USB_DEVICE_REMOTE_WAKEUP, 0,
2278 USB_CTRL_SET_TIMEOUT);
2280 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
2282 /* bail if autosuspend is requested */
2283 if (msg.event & PM_EVENT_AUTO)
2289 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
2291 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
2293 /* paranoia: "should not happen" */
2294 if (udev->do_remote_wakeup)
2295 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2296 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
2297 USB_DEVICE_REMOTE_WAKEUP, 0,
2299 USB_CTRL_SET_TIMEOUT);
2301 /* device has up to 10 msec to fully suspend */
2302 dev_dbg(&udev->dev, "usb %ssuspend\n",
2303 (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
2304 usb_set_device_state(udev, USB_STATE_SUSPENDED);
2307 usb_mark_last_busy(hub->hdev);
2312 * If the USB "suspend" state is in use (rather than "global suspend"),
2313 * many devices will be individually taken out of suspend state using
2314 * special "resume" signaling. This routine kicks in shortly after
2315 * hardware resume signaling is finished, either because of selective
2316 * resume (by host) or remote wakeup (by device) ... now see what changed
2317 * in the tree that's rooted at this device.
2319 * If @udev->reset_resume is set then the device is reset before the
2320 * status check is done.
2322 static int finish_port_resume(struct usb_device *udev)
2327 /* caller owns the udev device lock */
2328 dev_dbg(&udev->dev, "%s\n",
2329 udev->reset_resume ? "finish reset-resume" : "finish resume");
2331 /* usb ch9 identifies four variants of SUSPENDED, based on what
2332 * state the device resumes to. Linux currently won't see the
2333 * first two on the host side; they'd be inside hub_port_init()
2334 * during many timeouts, but khubd can't suspend until later.
2336 usb_set_device_state(udev, udev->actconfig
2337 ? USB_STATE_CONFIGURED
2338 : USB_STATE_ADDRESS);
2340 /* 10.5.4.5 says not to reset a suspended port if the attached
2341 * device is enabled for remote wakeup. Hence the reset
2342 * operation is carried out here, after the port has been
2345 if (udev->reset_resume)
2347 status = usb_reset_and_verify_device(udev);
2349 /* 10.5.4.5 says be sure devices in the tree are still there.
2350 * For now let's assume the device didn't go crazy on resume,
2351 * and device drivers will know about any resume quirks.
2355 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
2357 status = (status > 0 ? 0 : -ENODEV);
2359 /* If a normal resume failed, try doing a reset-resume */
2360 if (status && !udev->reset_resume && udev->persist_enabled) {
2361 dev_dbg(&udev->dev, "retry with reset-resume\n");
2362 udev->reset_resume = 1;
2363 goto retry_reset_resume;
2368 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
2370 } else if (udev->actconfig) {
2371 le16_to_cpus(&devstatus);
2372 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
2373 status = usb_control_msg(udev,
2374 usb_sndctrlpipe(udev, 0),
2375 USB_REQ_CLEAR_FEATURE,
2377 USB_DEVICE_REMOTE_WAKEUP, 0,
2379 USB_CTRL_SET_TIMEOUT);
2382 "disable remote wakeup, status %d\n",
2391 * usb_port_resume - re-activate a suspended usb device's upstream port
2392 * @udev: device to re-activate, not a root hub
2393 * Context: must be able to sleep; device not locked; pm locks held
2395 * This will re-activate the suspended device, increasing power usage
2396 * while letting drivers communicate again with its endpoints.
2397 * USB resume explicitly guarantees that the power session between
2398 * the host and the device is the same as it was when the device
2401 * If @udev->reset_resume is set then this routine won't check that the
2402 * port is still enabled. Furthermore, finish_port_resume() above will
2403 * reset @udev. The end result is that a broken power session can be
2404 * recovered and @udev will appear to persist across a loss of VBUS power.
2406 * For example, if a host controller doesn't maintain VBUS suspend current
2407 * during a system sleep or is reset when the system wakes up, all the USB
2408 * power sessions below it will be broken. This is especially troublesome
2409 * for mass-storage devices containing mounted filesystems, since the
2410 * device will appear to have disconnected and all the memory mappings
2411 * to it will be lost. Using the USB_PERSIST facility, the device can be
2412 * made to appear as if it had not disconnected.
2414 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
2415 * every effort to insure that the same device is present after the
2416 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2417 * quite possible for a device to remain unaltered but its media to be
2418 * changed. If the user replaces a flash memory card while the system is
2419 * asleep, he will have only himself to blame when the filesystem on the
2420 * new card is corrupted and the system crashes.
2422 * Returns 0 on success, else negative errno.
2424 int usb_port_resume(struct usb_device *udev, pm_message_t msg)
2426 struct usb_hub *hub = hdev_to_hub(udev->parent);
2427 int port1 = udev->portnum;
2429 u16 portchange, portstatus;
2431 /* Skip the initial Clear-Suspend step for a remote wakeup */
2432 status = hub_port_status(hub, port1, &portstatus, &portchange);
2433 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
2434 goto SuspendCleared;
2436 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2438 set_bit(port1, hub->busy_bits);
2440 /* see 7.1.7.7; affects power usage, but not budgeting */
2441 status = clear_port_feature(hub->hdev,
2442 port1, USB_PORT_FEAT_SUSPEND);
2444 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
2447 /* drive resume for at least 20 msec */
2448 dev_dbg(&udev->dev, "usb %sresume\n",
2449 (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
2452 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2453 * stop resume signaling. Then finish the resume
2456 status = hub_port_status(hub, port1, &portstatus, &portchange);
2458 /* TRSMRCY = 10 msec */
2464 if (portchange & USB_PORT_STAT_C_SUSPEND)
2465 clear_port_feature(hub->hdev, port1,
2466 USB_PORT_FEAT_C_SUSPEND);
2469 clear_bit(port1, hub->busy_bits);
2471 status = check_port_resume_type(udev,
2472 hub, port1, status, portchange, portstatus);
2474 status = finish_port_resume(udev);
2476 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2477 hub_port_logical_disconnect(hub, port1);
2482 /* caller has locked udev */
2483 int usb_remote_wakeup(struct usb_device *udev)
2487 if (udev->state == USB_STATE_SUSPENDED) {
2488 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
2489 status = usb_autoresume_device(udev);
2491 /* Let the drivers do their thing, then... */
2492 usb_autosuspend_device(udev);
2498 #else /* CONFIG_USB_SUSPEND */
2500 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2502 int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
2507 /* However we may need to do a reset-resume */
2509 int usb_port_resume(struct usb_device *udev, pm_message_t msg)
2511 struct usb_hub *hub = hdev_to_hub(udev->parent);
2512 int port1 = udev->portnum;
2514 u16 portchange, portstatus;
2516 status = hub_port_status(hub, port1, &portstatus, &portchange);
2517 status = check_port_resume_type(udev,
2518 hub, port1, status, portchange, portstatus);
2521 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2522 hub_port_logical_disconnect(hub, port1);
2523 } else if (udev->reset_resume) {
2524 dev_dbg(&udev->dev, "reset-resume\n");
2525 status = usb_reset_and_verify_device(udev);
2532 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
2534 struct usb_hub *hub = usb_get_intfdata (intf);
2535 struct usb_device *hdev = hub->hdev;
2538 /* fail if children aren't already suspended */
2539 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2540 struct usb_device *udev;
2542 udev = hdev->children [port1-1];
2543 if (udev && udev->can_submit) {
2544 if (!(msg.event & PM_EVENT_AUTO))
2545 dev_dbg(&intf->dev, "port %d nyet suspended\n",
2551 dev_dbg(&intf->dev, "%s\n", __func__);
2553 /* stop khubd and related activity */
2554 hub_quiesce(hub, HUB_SUSPEND);
2558 static int hub_resume(struct usb_interface *intf)
2560 struct usb_hub *hub = usb_get_intfdata(intf);
2562 dev_dbg(&intf->dev, "%s\n", __func__);
2563 hub_activate(hub, HUB_RESUME);
2567 static int hub_reset_resume(struct usb_interface *intf)
2569 struct usb_hub *hub = usb_get_intfdata(intf);
2571 dev_dbg(&intf->dev, "%s\n", __func__);
2572 hub_activate(hub, HUB_RESET_RESUME);
2577 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2578 * @rhdev: struct usb_device for the root hub
2580 * The USB host controller driver calls this function when its root hub
2581 * is resumed and Vbus power has been interrupted or the controller
2582 * has been reset. The routine marks @rhdev as having lost power.
2583 * When the hub driver is resumed it will take notice and carry out
2584 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2585 * the others will be disconnected.
2587 void usb_root_hub_lost_power(struct usb_device *rhdev)
2589 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2590 rhdev->reset_resume = 1;
2592 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2594 #else /* CONFIG_PM */
2596 #define hub_suspend NULL
2597 #define hub_resume NULL
2598 #define hub_reset_resume NULL
2602 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2604 * Between connect detection and reset signaling there must be a delay
2605 * of 100ms at least for debounce and power-settling. The corresponding
2606 * timer shall restart whenever the downstream port detects a disconnect.
2608 * Apparently there are some bluetooth and irda-dongles and a number of
2609 * low-speed devices for which this debounce period may last over a second.
2610 * Not covered by the spec - but easy to deal with.
2612 * This implementation uses a 1500ms total debounce timeout; if the
2613 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2614 * every 25ms for transient disconnects. When the port status has been
2615 * unchanged for 100ms it returns the port status.
2617 static int hub_port_debounce(struct usb_hub *hub, int port1)
2620 int total_time, stable_time = 0;
2621 u16 portchange, portstatus;
2622 unsigned connection = 0xffff;
2624 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2625 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2629 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2630 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2631 stable_time += HUB_DEBOUNCE_STEP;
2632 if (stable_time >= HUB_DEBOUNCE_STABLE)
2636 connection = portstatus & USB_PORT_STAT_CONNECTION;
2639 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2640 clear_port_feature(hub->hdev, port1,
2641 USB_PORT_FEAT_C_CONNECTION);
2644 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2646 msleep(HUB_DEBOUNCE_STEP);
2649 dev_dbg (hub->intfdev,
2650 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2651 port1, total_time, stable_time, portstatus);
2653 if (stable_time < HUB_DEBOUNCE_STABLE)
2658 void usb_ep0_reinit(struct usb_device *udev)
2660 usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
2661 usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
2662 usb_enable_endpoint(udev, &udev->ep0, true);
2664 EXPORT_SYMBOL_GPL(usb_ep0_reinit);
2666 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2667 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2669 static int hub_set_address(struct usb_device *udev, int devnum)
2672 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2675 * The host controller will choose the device address,
2676 * instead of the core having chosen it earlier
2678 if (!hcd->driver->address_device && devnum <= 1)
2680 if (udev->state == USB_STATE_ADDRESS)
2682 if (udev->state != USB_STATE_DEFAULT)
2684 if (hcd->driver->address_device)
2685 retval = hcd->driver->address_device(hcd, udev);
2687 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2688 USB_REQ_SET_ADDRESS, 0, devnum, 0,
2689 NULL, 0, USB_CTRL_SET_TIMEOUT);
2691 update_devnum(udev, devnum);
2692 /* Device now using proper address. */
2693 usb_set_device_state(udev, USB_STATE_ADDRESS);
2694 usb_ep0_reinit(udev);
2699 /* Reset device, (re)assign address, get device descriptor.
2700 * Device connection must be stable, no more debouncing needed.
2701 * Returns device in USB_STATE_ADDRESS, except on error.
2703 * If this is called for an already-existing device (as part of
2704 * usb_reset_and_verify_device), the caller must own the device lock. For a
2705 * newly detected device that is not accessible through any global
2706 * pointers, it's not necessary to lock the device.
2709 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2712 static DEFINE_MUTEX(usb_address0_mutex);
2714 struct usb_device *hdev = hub->hdev;
2715 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
2717 unsigned delay = HUB_SHORT_RESET_TIME;
2718 enum usb_device_speed oldspeed = udev->speed;
2720 int devnum = udev->devnum;
2722 /* root hub ports have a slightly longer reset period
2723 * (from USB 2.0 spec, section 7.1.7.5)
2725 if (!hdev->parent) {
2726 delay = HUB_ROOT_RESET_TIME;
2727 if (port1 == hdev->bus->otg_port)
2728 hdev->bus->b_hnp_enable = 0;
2731 /* Some low speed devices have problems with the quick delay, so */
2732 /* be a bit pessimistic with those devices. RHbug #23670 */
2733 if (oldspeed == USB_SPEED_LOW)
2734 delay = HUB_LONG_RESET_TIME;
2736 mutex_lock(&usb_address0_mutex);
2738 if (!udev->config && oldspeed == USB_SPEED_SUPER) {
2739 /* Don't reset USB 3.0 devices during an initial setup */
2740 usb_set_device_state(udev, USB_STATE_DEFAULT);
2742 /* Reset the device; full speed may morph to high speed */
2743 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
2744 retval = hub_port_reset(hub, port1, udev, delay);
2745 if (retval < 0) /* error or disconnect */
2747 /* success, speed is known */
2751 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2752 dev_dbg(&udev->dev, "device reset changed speed!\n");
2755 oldspeed = udev->speed;
2757 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2758 * it's fixed size except for full speed devices.
2759 * For Wireless USB devices, ep0 max packet is always 512 (tho
2760 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2762 switch (udev->speed) {
2763 case USB_SPEED_SUPER:
2764 case USB_SPEED_WIRELESS: /* fixed at 512 */
2765 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
2767 case USB_SPEED_HIGH: /* fixed at 64 */
2768 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
2770 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2771 /* to determine the ep0 maxpacket size, try to read
2772 * the device descriptor to get bMaxPacketSize0 and
2773 * then correct our initial guess.
2775 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
2777 case USB_SPEED_LOW: /* fixed at 8 */
2778 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
2785 switch (udev->speed) {
2786 case USB_SPEED_LOW: speed = "low"; break;
2787 case USB_SPEED_FULL: speed = "full"; break;
2788 case USB_SPEED_HIGH: speed = "high"; break;
2789 case USB_SPEED_SUPER:
2792 case USB_SPEED_WIRELESS:
2796 default: speed = "?"; break;
2798 if (udev->speed != USB_SPEED_SUPER)
2799 dev_info(&udev->dev,
2800 "%s %s speed %sUSB device number %d using %s\n",
2801 (udev->config) ? "reset" : "new", speed, type,
2802 devnum, udev->bus->controller->driver->name);
2804 /* Set up TT records, if needed */
2806 udev->tt = hdev->tt;
2807 udev->ttport = hdev->ttport;
2808 } else if (udev->speed != USB_SPEED_HIGH
2809 && hdev->speed == USB_SPEED_HIGH) {
2811 dev_err(&udev->dev, "parent hub has no TT\n");
2815 udev->tt = &hub->tt;
2816 udev->ttport = port1;
2819 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2820 * Because device hardware and firmware is sometimes buggy in
2821 * this area, and this is how Linux has done it for ages.
2822 * Change it cautiously.
2824 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2825 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2826 * so it may help with some non-standards-compliant devices.
2827 * Otherwise we start with SET_ADDRESS and then try to read the
2828 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2831 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2832 if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) {
2833 struct usb_device_descriptor *buf;
2836 #define GET_DESCRIPTOR_BUFSIZE 64
2837 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2843 /* Retry on all errors; some devices are flakey.
2844 * 255 is for WUSB devices, we actually need to use
2845 * 512 (WUSB1.0[4.8.1]).
2847 for (j = 0; j < 3; ++j) {
2848 buf->bMaxPacketSize0 = 0;
2849 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2850 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2851 USB_DT_DEVICE << 8, 0,
2852 buf, GET_DESCRIPTOR_BUFSIZE,
2853 initial_descriptor_timeout);
2854 switch (buf->bMaxPacketSize0) {
2855 case 8: case 16: case 32: case 64: case 255:
2856 if (buf->bDescriptorType ==
2870 udev->descriptor.bMaxPacketSize0 =
2871 buf->bMaxPacketSize0;
2874 retval = hub_port_reset(hub, port1, udev, delay);
2875 if (retval < 0) /* error or disconnect */
2877 if (oldspeed != udev->speed) {
2879 "device reset changed speed!\n");
2885 "device descriptor read/64, error %d\n",
2890 #undef GET_DESCRIPTOR_BUFSIZE
2894 * If device is WUSB, we already assigned an
2895 * unauthorized address in the Connect Ack sequence;
2896 * authorization will assign the final address.
2898 if (udev->wusb == 0) {
2899 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2900 retval = hub_set_address(udev, devnum);
2907 "device not accepting address %d, error %d\n",
2911 if (udev->speed == USB_SPEED_SUPER) {
2912 devnum = udev->devnum;
2913 dev_info(&udev->dev,
2914 "%s SuperSpeed USB device number %d using %s\n",
2915 (udev->config) ? "reset" : "new",
2916 devnum, udev->bus->controller->driver->name);
2919 /* cope with hardware quirkiness:
2920 * - let SET_ADDRESS settle, some device hardware wants it
2921 * - read ep0 maxpacket even for high and low speed,
2924 if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3))
2928 retval = usb_get_device_descriptor(udev, 8);
2931 "device descriptor read/8, error %d\n",
2943 if (udev->descriptor.bMaxPacketSize0 == 0xff ||
2944 udev->speed == USB_SPEED_SUPER)
2947 i = udev->descriptor.bMaxPacketSize0;
2948 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2949 if (udev->speed == USB_SPEED_LOW ||
2950 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2951 dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
2955 if (udev->speed == USB_SPEED_FULL)
2956 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2958 dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
2959 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2960 usb_ep0_reinit(udev);
2963 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2964 if (retval < (signed)sizeof(udev->descriptor)) {
2965 dev_err(&udev->dev, "device descriptor read/all, error %d\n",
2973 /* notify HCD that we have a device connected and addressed */
2974 if (hcd->driver->update_device)
2975 hcd->driver->update_device(hcd, udev);
2978 hub_port_disable(hub, port1, 0);
2979 update_devnum(udev, devnum); /* for disconnect processing */
2981 mutex_unlock(&usb_address0_mutex);
2986 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2988 struct usb_qualifier_descriptor *qual;
2991 qual = kmalloc (sizeof *qual, GFP_KERNEL);
2995 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2996 qual, sizeof *qual);
2997 if (status == sizeof *qual) {
2998 dev_info(&udev->dev, "not running at top speed; "
2999 "connect to a high speed hub\n");
3000 /* hub LEDs are probably harder to miss than syslog */
3001 if (hub->has_indicators) {
3002 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
3003 schedule_delayed_work (&hub->leds, 0);
3010 hub_power_remaining (struct usb_hub *hub)
3012 struct usb_device *hdev = hub->hdev;
3016 if (!hub->limited_power)
3019 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
3020 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
3021 struct usb_device *udev = hdev->children[port1 - 1];
3027 /* Unconfigured devices may not use more than 100mA,
3028 * or 8mA for OTG ports */
3029 if (udev->actconfig)
3030 delta = udev->actconfig->desc.bMaxPower * 2;
3031 else if (port1 != udev->bus->otg_port || hdev->parent)
3035 if (delta > hub->mA_per_port)
3036 dev_warn(&udev->dev,
3037 "%dmA is over %umA budget for port %d!\n",
3038 delta, hub->mA_per_port, port1);
3041 if (remaining < 0) {
3042 dev_warn(hub->intfdev, "%dmA over power budget!\n",
3049 /* Handle physical or logical connection change events.
3050 * This routine is called when:
3051 * a port connection-change occurs;
3052 * a port enable-change occurs (often caused by EMI);
3053 * usb_reset_and_verify_device() encounters changed descriptors (as from
3054 * a firmware download)
3055 * caller already locked the hub
3057 static void hub_port_connect_change(struct usb_hub *hub, int port1,
3058 u16 portstatus, u16 portchange)
3060 struct usb_device *hdev = hub->hdev;
3061 struct device *hub_dev = hub->intfdev;
3062 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
3063 unsigned wHubCharacteristics =
3064 le16_to_cpu(hub->descriptor->wHubCharacteristics);
3065 struct usb_device *udev;
3069 "port %d, status %04x, change %04x, %s\n",
3070 port1, portstatus, portchange, portspeed (portstatus));
3072 if (hub->has_indicators) {
3073 set_port_led(hub, port1, HUB_LED_AUTO);
3074 hub->indicator[port1-1] = INDICATOR_AUTO;
3077 #ifdef CONFIG_USB_OTG
3078 /* during HNP, don't repeat the debounce */
3079 if (hdev->bus->is_b_host)
3080 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
3081 USB_PORT_STAT_C_ENABLE);
3084 /* Try to resuscitate an existing device */
3085 udev = hdev->children[port1-1];
3086 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
3087 udev->state != USB_STATE_NOTATTACHED) {
3088 usb_lock_device(udev);
3089 if (portstatus & USB_PORT_STAT_ENABLE) {
3090 status = 0; /* Nothing to do */
3092 #ifdef CONFIG_USB_SUSPEND
3093 } else if (udev->state == USB_STATE_SUSPENDED &&
3094 udev->persist_enabled) {
3095 /* For a suspended device, treat this as a
3096 * remote wakeup event.
3098 status = usb_remote_wakeup(udev);
3102 status = -ENODEV; /* Don't resuscitate */
3104 usb_unlock_device(udev);
3107 clear_bit(port1, hub->change_bits);
3112 /* Disconnect any existing devices under this port */
3114 usb_disconnect(&hdev->children[port1-1]);
3115 clear_bit(port1, hub->change_bits);
3117 /* We can forget about a "removed" device when there's a physical
3118 * disconnect or the connect status changes.
3120 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
3121 (portchange & USB_PORT_STAT_C_CONNECTION))
3122 clear_bit(port1, hub->removed_bits);
3124 if (portchange & (USB_PORT_STAT_C_CONNECTION |
3125 USB_PORT_STAT_C_ENABLE)) {
3126 status = hub_port_debounce(hub, port1);
3128 if (printk_ratelimit())
3129 dev_err(hub_dev, "connect-debounce failed, "
3130 "port %d disabled\n", port1);
3131 portstatus &= ~USB_PORT_STAT_CONNECTION;
3133 portstatus = status;
3137 /* Return now if debouncing failed or nothing is connected or
3138 * the device was "removed".
3140 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
3141 test_bit(port1, hub->removed_bits)) {
3143 /* maybe switch power back on (e.g. root hub was reset) */
3144 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
3145 && !(portstatus & USB_PORT_STAT_POWER))
3146 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
3148 if (portstatus & USB_PORT_STAT_ENABLE)
3153 for (i = 0; i < SET_CONFIG_TRIES; i++) {
3155 /* reallocate for each attempt, since references
3156 * to the previous one can escape in various ways
3158 udev = usb_alloc_dev(hdev, hdev->bus, port1);
3161 "couldn't allocate port %d usb_device\n",
3166 usb_set_device_state(udev, USB_STATE_POWERED);
3167 udev->bus_mA = hub->mA_per_port;
3168 udev->level = hdev->level + 1;
3169 udev->wusb = hub_is_wusb(hub);
3172 * USB 3.0 devices are reset automatically before the connect
3173 * port status change appears, and the root hub port status
3174 * shows the correct speed. We also get port change
3175 * notifications for USB 3.0 devices from the USB 3.0 portion of
3176 * an external USB 3.0 hub, but this isn't handled correctly yet
3180 if (!(hcd->driver->flags & HCD_USB3))
3181 udev->speed = USB_SPEED_UNKNOWN;
3182 else if ((hdev->parent == NULL) &&
3183 (portstatus & USB_PORT_STAT_SUPER_SPEED))
3184 udev->speed = USB_SPEED_SUPER;
3186 udev->speed = USB_SPEED_UNKNOWN;
3188 choose_devnum(udev);
3189 if (udev->devnum <= 0) {
3190 status = -ENOTCONN; /* Don't retry */
3194 /* reset (non-USB 3.0 devices) and get descriptor */
3195 status = hub_port_init(hub, udev, port1, i);
3199 usb_detect_quirks(udev);
3200 if (udev->quirks & USB_QUIRK_DELAY_INIT)
3203 /* consecutive bus-powered hubs aren't reliable; they can
3204 * violate the voltage drop budget. if the new child has
3205 * a "powered" LED, users should notice we didn't enable it
3206 * (without reading syslog), even without per-port LEDs
3209 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
3210 && udev->bus_mA <= 100) {
3213 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
3216 dev_dbg(&udev->dev, "get status %d ?\n", status);
3219 le16_to_cpus(&devstat);
3220 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
3222 "can't connect bus-powered hub "
3224 if (hub->has_indicators) {
3225 hub->indicator[port1-1] =
3226 INDICATOR_AMBER_BLINK;
3227 schedule_delayed_work (&hub->leds, 0);
3229 status = -ENOTCONN; /* Don't retry */
3234 /* check for devices running slower than they could */
3235 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
3236 && udev->speed == USB_SPEED_FULL
3237 && highspeed_hubs != 0)
3238 check_highspeed (hub, udev, port1);
3240 /* Store the parent's children[] pointer. At this point
3241 * udev becomes globally accessible, although presumably
3242 * no one will look at it until hdev is unlocked.
3246 /* We mustn't add new devices if the parent hub has
3247 * been disconnected; we would race with the
3248 * recursively_mark_NOTATTACHED() routine.
3250 spin_lock_irq(&device_state_lock);
3251 if (hdev->state == USB_STATE_NOTATTACHED)
3254 hdev->children[port1-1] = udev;
3255 spin_unlock_irq(&device_state_lock);
3257 /* Run it through the hoops (find a driver, etc) */
3259 status = usb_new_device(udev);
3261 spin_lock_irq(&device_state_lock);
3262 hdev->children[port1-1] = NULL;
3263 spin_unlock_irq(&device_state_lock);
3270 status = hub_power_remaining(hub);
3272 dev_dbg(hub_dev, "%dmA power budget left\n", status);
3277 hub_port_disable(hub, port1, 1);
3279 usb_ep0_reinit(udev);
3280 release_devnum(udev);
3283 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
3286 if (hub->hdev->parent ||
3287 !hcd->driver->port_handed_over ||
3288 !(hcd->driver->port_handed_over)(hcd, port1))
3289 dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
3293 hub_port_disable(hub, port1, 1);
3294 if (hcd->driver->relinquish_port && !hub->hdev->parent)
3295 hcd->driver->relinquish_port(hcd, port1);
3298 static void hub_events(void)
3300 struct list_head *tmp;
3301 struct usb_device *hdev;
3302 struct usb_interface *intf;
3303 struct usb_hub *hub;
3304 struct device *hub_dev;
3313 * We restart the list every time to avoid a deadlock with
3314 * deleting hubs downstream from this one. This should be
3315 * safe since we delete the hub from the event list.
3316 * Not the most efficient, but avoids deadlocks.
3320 /* Grab the first entry at the beginning of the list */
3321 spin_lock_irq(&hub_event_lock);
3322 if (list_empty(&hub_event_list)) {
3323 spin_unlock_irq(&hub_event_lock);
3327 tmp = hub_event_list.next;
3330 hub = list_entry(tmp, struct usb_hub, event_list);
3331 kref_get(&hub->kref);
3332 spin_unlock_irq(&hub_event_lock);
3335 hub_dev = hub->intfdev;
3336 intf = to_usb_interface(hub_dev);
3337 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
3338 hdev->state, hub->descriptor
3339 ? hub->descriptor->bNbrPorts
3341 /* NOTE: expects max 15 ports... */
3342 (u16) hub->change_bits[0],
3343 (u16) hub->event_bits[0]);
3345 /* Lock the device, then check to see if we were
3346 * disconnected while waiting for the lock to succeed. */
3347 usb_lock_device(hdev);
3348 if (unlikely(hub->disconnected))
3349 goto loop_disconnected;
3351 /* If the hub has died, clean up after it */
3352 if (hdev->state == USB_STATE_NOTATTACHED) {
3353 hub->error = -ENODEV;
3354 hub_quiesce(hub, HUB_DISCONNECT);
3359 ret = usb_autopm_get_interface(intf);
3361 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
3365 /* If this is an inactive hub, do nothing */
3370 dev_dbg (hub_dev, "resetting for error %d\n",
3373 ret = usb_reset_device(hdev);
3376 "error resetting hub: %d\n", ret);
3384 /* deal with port status changes */
3385 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
3386 if (test_bit(i, hub->busy_bits))
3388 connect_change = test_bit(i, hub->change_bits);
3389 if (!test_and_clear_bit(i, hub->event_bits) &&
3393 ret = hub_port_status(hub, i,
3394 &portstatus, &portchange);
3398 if (portchange & USB_PORT_STAT_C_CONNECTION) {
3399 clear_port_feature(hdev, i,
3400 USB_PORT_FEAT_C_CONNECTION);
3404 if (portchange & USB_PORT_STAT_C_ENABLE) {
3405 if (!connect_change)
3407 "port %d enable change, "
3410 clear_port_feature(hdev, i,
3411 USB_PORT_FEAT_C_ENABLE);
3414 * EM interference sometimes causes badly
3415 * shielded USB devices to be shutdown by
3416 * the hub, this hack enables them again.
3417 * Works at least with mouse driver.
3419 if (!(portstatus & USB_PORT_STAT_ENABLE)
3421 && hdev->children[i-1]) {
3424 "disabled by hub (EMI?), "
3431 if (portchange & USB_PORT_STAT_C_SUSPEND) {
3432 struct usb_device *udev;
3434 clear_port_feature(hdev, i,
3435 USB_PORT_FEAT_C_SUSPEND);
3436 udev = hdev->children[i-1];
3438 /* TRSMRCY = 10 msec */
3441 usb_lock_device(udev);
3442 ret = usb_remote_wakeup(hdev->
3444 usb_unlock_device(udev);
3449 hub_port_disable(hub, i, 1);
3452 "resume on port %d, status %d\n",
3456 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
3460 dev_dbg(hub_dev, "over-current change on port "
3462 clear_port_feature(hdev, i,
3463 USB_PORT_FEAT_C_OVER_CURRENT);
3464 msleep(100); /* Cool down */
3465 hub_power_on(hub, true);
3466 hub_port_status(hub, i, &status, &unused);
3467 if (status & USB_PORT_STAT_OVERCURRENT)
3468 dev_err(hub_dev, "over-current "
3469 "condition on port %d\n", i);
3472 if (portchange & USB_PORT_STAT_C_RESET) {
3474 "reset change on port %d\n",
3476 clear_port_feature(hdev, i,
3477 USB_PORT_FEAT_C_RESET);
3479 if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
3480 hub_is_superspeed(hub->hdev)) {
3482 "warm reset change on port %d\n",
3484 clear_port_feature(hdev, i,
3485 USB_PORT_FEAT_C_BH_PORT_RESET);
3487 if (portchange & USB_PORT_STAT_C_LINK_STATE) {
3488 clear_port_feature(hub->hdev, i,
3489 USB_PORT_FEAT_C_PORT_LINK_STATE);
3491 if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
3493 "config error on port %d\n",
3495 clear_port_feature(hub->hdev, i,
3496 USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
3500 hub_port_connect_change(hub, i,
3501 portstatus, portchange);
3504 /* deal with hub status changes */
3505 if (test_and_clear_bit(0, hub->event_bits) == 0)
3507 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
3508 dev_err (hub_dev, "get_hub_status failed\n");
3510 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
3511 dev_dbg (hub_dev, "power change\n");
3512 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
3513 if (hubstatus & HUB_STATUS_LOCAL_POWER)
3514 /* FIXME: Is this always true? */
3515 hub->limited_power = 1;
3517 hub->limited_power = 0;
3519 if (hubchange & HUB_CHANGE_OVERCURRENT) {
3523 dev_dbg(hub_dev, "over-current change\n");
3524 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
3525 msleep(500); /* Cool down */
3526 hub_power_on(hub, true);
3527 hub_hub_status(hub, &status, &unused);
3528 if (status & HUB_STATUS_OVERCURRENT)
3529 dev_err(hub_dev, "over-current "
3535 /* Balance the usb_autopm_get_interface() above */
3536 usb_autopm_put_interface_no_suspend(intf);
3538 /* Balance the usb_autopm_get_interface_no_resume() in
3539 * kick_khubd() and allow autosuspend.
3541 usb_autopm_put_interface(intf);
3543 usb_unlock_device(hdev);
3544 kref_put(&hub->kref, hub_release);
3546 } /* end while (1) */
3549 static int hub_thread(void *__unused)
3551 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3552 * port handover. Otherwise it might see that a full-speed device
3553 * was gone before the EHCI controller had handed its port over to
3554 * the companion full-speed controller.
3560 wait_event_freezable(khubd_wait,
3561 !list_empty(&hub_event_list) ||
3562 kthread_should_stop());
3563 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
3565 pr_debug("%s: khubd exiting\n", usbcore_name);
3569 static const struct usb_device_id hub_id_table[] = {
3570 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
3571 .bDeviceClass = USB_CLASS_HUB},
3572 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
3573 .bInterfaceClass = USB_CLASS_HUB},
3574 { } /* Terminating entry */
3577 MODULE_DEVICE_TABLE (usb, hub_id_table);
3579 static struct usb_driver hub_driver = {
3582 .disconnect = hub_disconnect,
3583 .suspend = hub_suspend,
3584 .resume = hub_resume,
3585 .reset_resume = hub_reset_resume,
3586 .pre_reset = hub_pre_reset,
3587 .post_reset = hub_post_reset,
3588 .unlocked_ioctl = hub_ioctl,
3589 .id_table = hub_id_table,
3590 .supports_autosuspend = 1,
3593 int usb_hub_init(void)
3595 if (usb_register(&hub_driver) < 0) {
3596 printk(KERN_ERR "%s: can't register hub driver\n",
3601 khubd_task = kthread_run(hub_thread, NULL, "khubd");
3602 if (!IS_ERR(khubd_task))
3605 /* Fall through if kernel_thread failed */
3606 usb_deregister(&hub_driver);
3607 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
3612 void usb_hub_cleanup(void)
3614 kthread_stop(khubd_task);
3617 * Hub resources are freed for us by usb_deregister. It calls
3618 * usb_driver_purge on every device which in turn calls that
3619 * devices disconnect function if it is using this driver.
3620 * The hub_disconnect function takes care of releasing the
3621 * individual hub resources. -greg
3623 usb_deregister(&hub_driver);
3624 } /* usb_hub_cleanup() */
3626 static int descriptors_changed(struct usb_device *udev,
3627 struct usb_device_descriptor *old_device_descriptor)
3631 unsigned serial_len = 0;
3633 unsigned old_length;
3637 if (memcmp(&udev->descriptor, old_device_descriptor,
3638 sizeof(*old_device_descriptor)) != 0)
3641 /* Since the idVendor, idProduct, and bcdDevice values in the
3642 * device descriptor haven't changed, we will assume the
3643 * Manufacturer and Product strings haven't changed either.
3644 * But the SerialNumber string could be different (e.g., a
3645 * different flash card of the same brand).
3648 serial_len = strlen(udev->serial) + 1;
3651 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3652 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3653 len = max(len, old_length);
3656 buf = kmalloc(len, GFP_NOIO);
3658 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
3659 /* assume the worst */
3662 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3663 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3664 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
3666 if (length != old_length) {
3667 dev_dbg(&udev->dev, "config index %d, error %d\n",
3672 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3674 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
3676 ((struct usb_config_descriptor *) buf)->
3677 bConfigurationValue);
3683 if (!changed && serial_len) {
3684 length = usb_string(udev, udev->descriptor.iSerialNumber,
3686 if (length + 1 != serial_len) {
3687 dev_dbg(&udev->dev, "serial string error %d\n",
3690 } else if (memcmp(buf, udev->serial, length) != 0) {
3691 dev_dbg(&udev->dev, "serial string changed\n");
3701 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
3702 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3704 * WARNING - don't use this routine to reset a composite device
3705 * (one with multiple interfaces owned by separate drivers)!
3706 * Use usb_reset_device() instead.
3708 * Do a port reset, reassign the device's address, and establish its
3709 * former operating configuration. If the reset fails, or the device's
3710 * descriptors change from their values before the reset, or the original
3711 * configuration and altsettings cannot be restored, a flag will be set
3712 * telling khubd to pretend the device has been disconnected and then
3713 * re-connected. All drivers will be unbound, and the device will be
3714 * re-enumerated and probed all over again.
3716 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3717 * flagged for logical disconnection, or some other negative error code
3718 * if the reset wasn't even attempted.
3720 * The caller must own the device lock. For example, it's safe to use
3721 * this from a driver probe() routine after downloading new firmware.
3722 * For calls that might not occur during probe(), drivers should lock
3723 * the device using usb_lock_device_for_reset().
3725 * Locking exception: This routine may also be called from within an
3726 * autoresume handler. Such usage won't conflict with other tasks
3727 * holding the device lock because these tasks should always call
3728 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3730 static int usb_reset_and_verify_device(struct usb_device *udev)
3732 struct usb_device *parent_hdev = udev->parent;
3733 struct usb_hub *parent_hub;
3734 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
3735 struct usb_device_descriptor descriptor = udev->descriptor;
3737 int port1 = udev->portnum;
3739 if (udev->state == USB_STATE_NOTATTACHED ||
3740 udev->state == USB_STATE_SUSPENDED) {
3741 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3747 /* this requires hcd-specific logic; see ohci_restart() */
3748 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
3751 parent_hub = hdev_to_hub(parent_hdev);
3753 set_bit(port1, parent_hub->busy_bits);
3754 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3756 /* ep0 maxpacket size may change; let the HCD know about it.
3757 * Other endpoints will be handled by re-enumeration. */
3758 usb_ep0_reinit(udev);
3759 ret = hub_port_init(parent_hub, udev, port1, i);
3760 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
3763 clear_bit(port1, parent_hub->busy_bits);
3768 /* Device might have changed firmware (DFU or similar) */
3769 if (descriptors_changed(udev, &descriptor)) {
3770 dev_info(&udev->dev, "device firmware changed\n");
3771 udev->descriptor = descriptor; /* for disconnect() calls */
3775 /* Restore the device's previous configuration */
3776 if (!udev->actconfig)
3779 mutex_lock(hcd->bandwidth_mutex);
3780 ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
3782 dev_warn(&udev->dev,
3783 "Busted HC? Not enough HCD resources for "
3784 "old configuration.\n");
3785 mutex_unlock(hcd->bandwidth_mutex);
3788 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3789 USB_REQ_SET_CONFIGURATION, 0,
3790 udev->actconfig->desc.bConfigurationValue, 0,
3791 NULL, 0, USB_CTRL_SET_TIMEOUT);
3794 "can't restore configuration #%d (error=%d)\n",
3795 udev->actconfig->desc.bConfigurationValue, ret);
3796 mutex_unlock(hcd->bandwidth_mutex);
3799 mutex_unlock(hcd->bandwidth_mutex);
3800 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3802 /* Put interfaces back into the same altsettings as before.
3803 * Don't bother to send the Set-Interface request for interfaces
3804 * that were already in altsetting 0; besides being unnecessary,
3805 * many devices can't handle it. Instead just reset the host-side
3808 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3809 struct usb_host_config *config = udev->actconfig;
3810 struct usb_interface *intf = config->interface[i];
3811 struct usb_interface_descriptor *desc;
3813 desc = &intf->cur_altsetting->desc;
3814 if (desc->bAlternateSetting == 0) {
3815 usb_disable_interface(udev, intf, true);
3816 usb_enable_interface(udev, intf, true);
3819 /* Let the bandwidth allocation function know that this
3820 * device has been reset, and it will have to use
3821 * alternate setting 0 as the current alternate setting.
3823 intf->resetting_device = 1;
3824 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3825 desc->bAlternateSetting);
3826 intf->resetting_device = 0;
3829 dev_err(&udev->dev, "failed to restore interface %d "
3830 "altsetting %d (error=%d)\n",
3831 desc->bInterfaceNumber,
3832 desc->bAlternateSetting,
3842 hub_port_logical_disconnect(parent_hub, port1);
3847 * usb_reset_device - warn interface drivers and perform a USB port reset
3848 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3850 * Warns all drivers bound to registered interfaces (using their pre_reset
3851 * method), performs the port reset, and then lets the drivers know that
3852 * the reset is over (using their post_reset method).
3854 * Return value is the same as for usb_reset_and_verify_device().
3856 * The caller must own the device lock. For example, it's safe to use
3857 * this from a driver probe() routine after downloading new firmware.
3858 * For calls that might not occur during probe(), drivers should lock
3859 * the device using usb_lock_device_for_reset().
3861 * If an interface is currently being probed or disconnected, we assume
3862 * its driver knows how to handle resets. For all other interfaces,
3863 * if the driver doesn't have pre_reset and post_reset methods then
3864 * we attempt to unbind it and rebind afterward.
3866 int usb_reset_device(struct usb_device *udev)
3870 struct usb_host_config *config = udev->actconfig;
3872 if (udev->state == USB_STATE_NOTATTACHED ||
3873 udev->state == USB_STATE_SUSPENDED) {
3874 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3879 /* Prevent autosuspend during the reset */
3880 usb_autoresume_device(udev);
3883 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3884 struct usb_interface *cintf = config->interface[i];
3885 struct usb_driver *drv;
3888 if (cintf->dev.driver) {
3889 drv = to_usb_driver(cintf->dev.driver);
3890 if (drv->pre_reset && drv->post_reset)
3891 unbind = (drv->pre_reset)(cintf);
3892 else if (cintf->condition ==
3893 USB_INTERFACE_BOUND)
3896 usb_forced_unbind_intf(cintf);
3901 ret = usb_reset_and_verify_device(udev);
3904 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3905 struct usb_interface *cintf = config->interface[i];
3906 struct usb_driver *drv;
3907 int rebind = cintf->needs_binding;
3909 if (!rebind && cintf->dev.driver) {
3910 drv = to_usb_driver(cintf->dev.driver);
3911 if (drv->post_reset)
3912 rebind = (drv->post_reset)(cintf);
3913 else if (cintf->condition ==
3914 USB_INTERFACE_BOUND)
3917 if (ret == 0 && rebind)
3918 usb_rebind_intf(cintf);
3922 usb_autosuspend_device(udev);
3925 EXPORT_SYMBOL_GPL(usb_reset_device);
3929 * usb_queue_reset_device - Reset a USB device from an atomic context
3930 * @iface: USB interface belonging to the device to reset
3932 * This function can be used to reset a USB device from an atomic
3933 * context, where usb_reset_device() won't work (as it blocks).
3935 * Doing a reset via this method is functionally equivalent to calling
3936 * usb_reset_device(), except for the fact that it is delayed to a
3937 * workqueue. This means that any drivers bound to other interfaces
3938 * might be unbound, as well as users from usbfs in user space.
3942 * - Scheduling two resets at the same time from two different drivers
3943 * attached to two different interfaces of the same device is
3944 * possible; depending on how the driver attached to each interface
3945 * handles ->pre_reset(), the second reset might happen or not.
3947 * - If a driver is unbound and it had a pending reset, the reset will
3950 * - This function can be called during .probe() or .disconnect()
3951 * times. On return from .disconnect(), any pending resets will be
3954 * There is no no need to lock/unlock the @reset_ws as schedule_work()
3957 * NOTE: We don't do any reference count tracking because it is not
3958 * needed. The lifecycle of the work_struct is tied to the
3959 * usb_interface. Before destroying the interface we cancel the
3960 * work_struct, so the fact that work_struct is queued and or
3961 * running means the interface (and thus, the device) exist and
3964 void usb_queue_reset_device(struct usb_interface *iface)
3966 schedule_work(&iface->reset_ws);
3968 EXPORT_SYMBOL_GPL(usb_queue_reset_device);