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(struct usb_hub *hub, int portstatus)
160 if (hub_is_superspeed(hub->hdev))
162 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
164 else if (portstatus & USB_PORT_STAT_LOW_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);
384 mutex_unlock(&hub->status_mutex);
388 static void kick_khubd(struct usb_hub *hub)
392 spin_lock_irqsave(&hub_event_lock, flags);
393 if (!hub->disconnected && list_empty(&hub->event_list)) {
394 list_add_tail(&hub->event_list, &hub_event_list);
396 /* Suppress autosuspend until khubd runs */
397 usb_autopm_get_interface_no_resume(
398 to_usb_interface(hub->intfdev));
399 wake_up(&khubd_wait);
401 spin_unlock_irqrestore(&hub_event_lock, flags);
404 void usb_kick_khubd(struct usb_device *hdev)
406 struct usb_hub *hub = hdev_to_hub(hdev);
413 /* completion function, fires on port status changes and various faults */
414 static void hub_irq(struct urb *urb)
416 struct usb_hub *hub = urb->context;
417 int status = urb->status;
422 case -ENOENT: /* synchronous unlink */
423 case -ECONNRESET: /* async unlink */
424 case -ESHUTDOWN: /* hardware going away */
427 default: /* presumably an error */
428 /* Cause a hub reset after 10 consecutive errors */
429 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
430 if ((++hub->nerrors < 10) || hub->error)
435 /* let khubd handle things */
436 case 0: /* we got data: port status changed */
438 for (i = 0; i < urb->actual_length; ++i)
439 bits |= ((unsigned long) ((*hub->buffer)[i]))
441 hub->event_bits[0] = bits;
447 /* Something happened, let khubd figure it out */
454 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
455 && status != -ENODEV && status != -EPERM)
456 dev_err (hub->intfdev, "resubmit --> %d\n", status);
459 /* USB 2.0 spec Section 11.24.2.3 */
461 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
463 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
464 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
469 * enumeration blocks khubd for a long time. we use keventd instead, since
470 * long blocking there is the exception, not the rule. accordingly, HCDs
471 * talking to TTs must queue control transfers (not just bulk and iso), so
472 * both can talk to the same hub concurrently.
474 static void hub_tt_work(struct work_struct *work)
476 struct usb_hub *hub =
477 container_of(work, struct usb_hub, tt.clear_work);
481 spin_lock_irqsave (&hub->tt.lock, flags);
482 while (--limit && !list_empty (&hub->tt.clear_list)) {
483 struct list_head *next;
484 struct usb_tt_clear *clear;
485 struct usb_device *hdev = hub->hdev;
486 const struct hc_driver *drv;
489 next = hub->tt.clear_list.next;
490 clear = list_entry (next, struct usb_tt_clear, clear_list);
491 list_del (&clear->clear_list);
493 /* drop lock so HCD can concurrently report other TT errors */
494 spin_unlock_irqrestore (&hub->tt.lock, flags);
495 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
498 "clear tt %d (%04x) error %d\n",
499 clear->tt, clear->devinfo, status);
501 /* Tell the HCD, even if the operation failed */
502 drv = clear->hcd->driver;
503 if (drv->clear_tt_buffer_complete)
504 (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
507 spin_lock_irqsave(&hub->tt.lock, flags);
509 spin_unlock_irqrestore (&hub->tt.lock, flags);
513 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
514 * @urb: an URB associated with the failed or incomplete split transaction
516 * High speed HCDs use this to tell the hub driver that some split control or
517 * bulk transaction failed in a way that requires clearing internal state of
518 * a transaction translator. This is normally detected (and reported) from
521 * It may not be possible for that hub to handle additional full (or low)
522 * speed transactions until that state is fully cleared out.
524 int usb_hub_clear_tt_buffer(struct urb *urb)
526 struct usb_device *udev = urb->dev;
527 int pipe = urb->pipe;
528 struct usb_tt *tt = udev->tt;
530 struct usb_tt_clear *clear;
532 /* we've got to cope with an arbitrary number of pending TT clears,
533 * since each TT has "at least two" buffers that can need it (and
534 * there can be many TTs per hub). even if they're uncommon.
536 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
537 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
538 /* FIXME recover somehow ... RESET_TT? */
542 /* info that CLEAR_TT_BUFFER needs */
543 clear->tt = tt->multi ? udev->ttport : 1;
544 clear->devinfo = usb_pipeendpoint (pipe);
545 clear->devinfo |= udev->devnum << 4;
546 clear->devinfo |= usb_pipecontrol (pipe)
547 ? (USB_ENDPOINT_XFER_CONTROL << 11)
548 : (USB_ENDPOINT_XFER_BULK << 11);
549 if (usb_pipein (pipe))
550 clear->devinfo |= 1 << 15;
552 /* info for completion callback */
553 clear->hcd = bus_to_hcd(udev->bus);
556 /* tell keventd to clear state for this TT */
557 spin_lock_irqsave (&tt->lock, flags);
558 list_add_tail (&clear->clear_list, &tt->clear_list);
559 schedule_work(&tt->clear_work);
560 spin_unlock_irqrestore (&tt->lock, flags);
563 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
565 /* If do_delay is false, return the number of milliseconds the caller
568 static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
571 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
573 u16 wHubCharacteristics =
574 le16_to_cpu(hub->descriptor->wHubCharacteristics);
576 /* Enable power on each port. Some hubs have reserved values
577 * of LPSM (> 2) in their descriptors, even though they are
578 * USB 2.0 hubs. Some hubs do not implement port-power switching
579 * but only emulate it. In all cases, the ports won't work
580 * unless we send these messages to the hub.
582 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
583 dev_dbg(hub->intfdev, "enabling power on all ports\n");
585 dev_dbg(hub->intfdev, "trying to enable port power on "
586 "non-switchable hub\n");
587 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
588 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
590 /* Wait at least 100 msec for power to become stable */
591 delay = max(pgood_delay, (unsigned) 100);
597 static int hub_hub_status(struct usb_hub *hub,
598 u16 *status, u16 *change)
602 mutex_lock(&hub->status_mutex);
603 ret = get_hub_status(hub->hdev, &hub->status->hub);
605 dev_err (hub->intfdev,
606 "%s failed (err = %d)\n", __func__, ret);
608 *status = le16_to_cpu(hub->status->hub.wHubStatus);
609 *change = le16_to_cpu(hub->status->hub.wHubChange);
612 mutex_unlock(&hub->status_mutex);
616 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
618 struct usb_device *hdev = hub->hdev;
621 if (hdev->children[port1-1] && set_state)
622 usb_set_device_state(hdev->children[port1-1],
623 USB_STATE_NOTATTACHED);
624 if (!hub->error && !hub_is_superspeed(hub->hdev))
625 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
627 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
633 * Disable a port and mark a logical connect-change event, so that some
634 * time later khubd will disconnect() any existing usb_device on the port
635 * and will re-enumerate if there actually is a device attached.
637 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
639 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
640 hub_port_disable(hub, port1, 1);
642 /* FIXME let caller ask to power down the port:
643 * - some devices won't enumerate without a VBUS power cycle
644 * - SRP saves power that way
645 * - ... new call, TBD ...
646 * That's easy if this hub can switch power per-port, and
647 * khubd reactivates the port later (timer, SRP, etc).
648 * Powerdown must be optional, because of reset/DFU.
651 set_bit(port1, hub->change_bits);
656 * usb_remove_device - disable a device's port on its parent hub
657 * @udev: device to be disabled and removed
658 * Context: @udev locked, must be able to sleep.
660 * After @udev's port has been disabled, khubd is notified and it will
661 * see that the device has been disconnected. When the device is
662 * physically unplugged and something is plugged in, the events will
663 * be received and processed normally.
665 int usb_remove_device(struct usb_device *udev)
668 struct usb_interface *intf;
670 if (!udev->parent) /* Can't remove a root hub */
672 hub = hdev_to_hub(udev->parent);
673 intf = to_usb_interface(hub->intfdev);
675 usb_autopm_get_interface(intf);
676 set_bit(udev->portnum, hub->removed_bits);
677 hub_port_logical_disconnect(hub, udev->portnum);
678 usb_autopm_put_interface(intf);
682 enum hub_activation_type {
683 HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */
684 HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
687 static void hub_init_func2(struct work_struct *ws);
688 static void hub_init_func3(struct work_struct *ws);
690 static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
692 struct usb_device *hdev = hub->hdev;
697 bool need_debounce_delay = false;
700 /* Continue a partial initialization */
701 if (type == HUB_INIT2)
703 if (type == HUB_INIT3)
706 /* After a resume, port power should still be on.
707 * For any other type of activation, turn it on.
709 if (type != HUB_RESUME) {
711 /* Speed up system boot by using a delayed_work for the
712 * hub's initial power-up delays. This is pretty awkward
713 * and the implementation looks like a home-brewed sort of
714 * setjmp/longjmp, but it saves at least 100 ms for each
715 * root hub (assuming usbcore is compiled into the kernel
716 * rather than as a module). It adds up.
718 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
719 * because for those activation types the ports have to be
720 * operational when we return. In theory this could be done
721 * for HUB_POST_RESET, but it's easier not to.
723 if (type == HUB_INIT) {
724 delay = hub_power_on(hub, false);
725 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
726 schedule_delayed_work(&hub->init_work,
727 msecs_to_jiffies(delay));
729 /* Suppress autosuspend until init is done */
730 usb_autopm_get_interface_no_resume(
731 to_usb_interface(hub->intfdev));
732 return; /* Continues at init2: below */
733 } else if (type == HUB_RESET_RESUME) {
734 /* The internal host controller state for the hub device
735 * may be gone after a host power loss on system resume.
736 * Update the device's info so the HW knows it's a hub.
738 hcd = bus_to_hcd(hdev->bus);
739 if (hcd->driver->update_hub_device) {
740 ret = hcd->driver->update_hub_device(hcd, hdev,
743 dev_err(hub->intfdev, "Host not "
744 "accepting hub info "
746 dev_err(hub->intfdev, "LS/FS devices "
747 "and hubs may not work "
748 "under this hub\n.");
751 hub_power_on(hub, true);
753 hub_power_on(hub, true);
758 /* Check each port and set hub->change_bits to let khubd know
759 * which ports need attention.
761 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
762 struct usb_device *udev = hdev->children[port1-1];
763 u16 portstatus, portchange;
765 portstatus = portchange = 0;
766 status = hub_port_status(hub, port1, &portstatus, &portchange);
767 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
768 dev_dbg(hub->intfdev,
769 "port %d: status %04x change %04x\n",
770 port1, portstatus, portchange);
772 /* After anything other than HUB_RESUME (i.e., initialization
773 * or any sort of reset), every port should be disabled.
774 * Unconnected ports should likewise be disabled (paranoia),
775 * and so should ports for which we have no usb_device.
777 if ((portstatus & USB_PORT_STAT_ENABLE) && (
778 type != HUB_RESUME ||
779 !(portstatus & USB_PORT_STAT_CONNECTION) ||
781 udev->state == USB_STATE_NOTATTACHED)) {
783 * USB3 protocol ports will automatically transition
784 * to Enabled state when detect an USB3.0 device attach.
785 * Do not disable USB3 protocol ports.
787 if (!hub_is_superspeed(hdev)) {
788 clear_port_feature(hdev, port1,
789 USB_PORT_FEAT_ENABLE);
790 portstatus &= ~USB_PORT_STAT_ENABLE;
792 /* Pretend that power was lost for USB3 devs */
793 portstatus &= ~USB_PORT_STAT_ENABLE;
797 /* Clear status-change flags; we'll debounce later */
798 if (portchange & USB_PORT_STAT_C_CONNECTION) {
799 need_debounce_delay = true;
800 clear_port_feature(hub->hdev, port1,
801 USB_PORT_FEAT_C_CONNECTION);
803 if (portchange & USB_PORT_STAT_C_ENABLE) {
804 need_debounce_delay = true;
805 clear_port_feature(hub->hdev, port1,
806 USB_PORT_FEAT_C_ENABLE);
808 if (portchange & USB_PORT_STAT_C_LINK_STATE) {
809 need_debounce_delay = true;
810 clear_port_feature(hub->hdev, port1,
811 USB_PORT_FEAT_C_PORT_LINK_STATE);
814 /* We can forget about a "removed" device when there's a
815 * physical disconnect or the connect status changes.
817 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
818 (portchange & USB_PORT_STAT_C_CONNECTION))
819 clear_bit(port1, hub->removed_bits);
821 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
822 /* Tell khubd to disconnect the device or
823 * check for a new connection
825 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
826 set_bit(port1, hub->change_bits);
828 } else if (portstatus & USB_PORT_STAT_ENABLE) {
829 /* The power session apparently survived the resume.
830 * If there was an overcurrent or suspend change
831 * (i.e., remote wakeup request), have khubd
835 set_bit(port1, hub->change_bits);
837 } else if (udev->persist_enabled) {
839 udev->reset_resume = 1;
841 set_bit(port1, hub->change_bits);
844 /* The power session is gone; tell khubd */
845 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
846 set_bit(port1, hub->change_bits);
850 /* If no port-status-change flags were set, we don't need any
851 * debouncing. If flags were set we can try to debounce the
852 * ports all at once right now, instead of letting khubd do them
853 * one at a time later on.
855 * If any port-status changes do occur during this delay, khubd
856 * will see them later and handle them normally.
858 if (need_debounce_delay) {
859 delay = HUB_DEBOUNCE_STABLE;
861 /* Don't do a long sleep inside a workqueue routine */
862 if (type == HUB_INIT2) {
863 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
864 schedule_delayed_work(&hub->init_work,
865 msecs_to_jiffies(delay));
866 return; /* Continues at init3: below */
874 status = usb_submit_urb(hub->urb, GFP_NOIO);
876 dev_err(hub->intfdev, "activate --> %d\n", status);
877 if (hub->has_indicators && blinkenlights)
878 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
880 /* Scan all ports that need attention */
883 /* Allow autosuspend if it was suppressed */
884 if (type <= HUB_INIT3)
885 usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
888 /* Implement the continuations for the delays above */
889 static void hub_init_func2(struct work_struct *ws)
891 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
893 hub_activate(hub, HUB_INIT2);
896 static void hub_init_func3(struct work_struct *ws)
898 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
900 hub_activate(hub, HUB_INIT3);
903 enum hub_quiescing_type {
904 HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
907 static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
909 struct usb_device *hdev = hub->hdev;
912 cancel_delayed_work_sync(&hub->init_work);
914 /* khubd and related activity won't re-trigger */
917 if (type != HUB_SUSPEND) {
918 /* Disconnect all the children */
919 for (i = 0; i < hdev->maxchild; ++i) {
920 if (hdev->children[i])
921 usb_disconnect(&hdev->children[i]);
925 /* Stop khubd and related activity */
926 usb_kill_urb(hub->urb);
927 if (hub->has_indicators)
928 cancel_delayed_work_sync(&hub->leds);
930 cancel_work_sync(&hub->tt.clear_work);
933 /* caller has locked the hub device */
934 static int hub_pre_reset(struct usb_interface *intf)
936 struct usb_hub *hub = usb_get_intfdata(intf);
938 hub_quiesce(hub, HUB_PRE_RESET);
942 /* caller has locked the hub device */
943 static int hub_post_reset(struct usb_interface *intf)
945 struct usb_hub *hub = usb_get_intfdata(intf);
947 hub_activate(hub, HUB_POST_RESET);
951 static int hub_configure(struct usb_hub *hub,
952 struct usb_endpoint_descriptor *endpoint)
955 struct usb_device *hdev = hub->hdev;
956 struct device *hub_dev = hub->intfdev;
957 u16 hubstatus, hubchange;
958 u16 wHubCharacteristics;
961 char *message = "out of memory";
963 hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
969 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
974 mutex_init(&hub->status_mutex);
976 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
977 if (!hub->descriptor) {
982 if (hub_is_superspeed(hdev) && (hdev->parent != NULL)) {
983 ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
984 HUB_SET_DEPTH, USB_RT_HUB,
985 hdev->level - 1, 0, NULL, 0,
986 USB_CTRL_SET_TIMEOUT);
989 message = "can't set hub depth";
994 /* Request the entire hub descriptor.
995 * hub->descriptor can handle USB_MAXCHILDREN ports,
996 * but the hub can/will return fewer bytes here.
998 ret = get_hub_descriptor(hdev, hub->descriptor);
1000 message = "can't read hub descriptor";
1002 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
1003 message = "hub has too many ports!";
1008 hdev->maxchild = hub->descriptor->bNbrPorts;
1009 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
1010 (hdev->maxchild == 1) ? "" : "s");
1012 hub->port_owners = kzalloc(hdev->maxchild * sizeof(void *), GFP_KERNEL);
1013 if (!hub->port_owners) {
1018 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1020 /* FIXME for USB 3.0, skip for now */
1021 if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
1022 !(hub_is_superspeed(hdev))) {
1024 char portstr [USB_MAXCHILDREN + 1];
1026 for (i = 0; i < hdev->maxchild; i++)
1027 portstr[i] = hub->descriptor->u.hs.DeviceRemovable
1028 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
1030 portstr[hdev->maxchild] = 0;
1031 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
1033 dev_dbg(hub_dev, "standalone hub\n");
1035 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1037 dev_dbg(hub_dev, "ganged power switching\n");
1040 dev_dbg(hub_dev, "individual port power switching\n");
1044 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
1048 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1050 dev_dbg(hub_dev, "global over-current protection\n");
1053 dev_dbg(hub_dev, "individual port over-current protection\n");
1057 dev_dbg(hub_dev, "no over-current protection\n");
1061 spin_lock_init (&hub->tt.lock);
1062 INIT_LIST_HEAD (&hub->tt.clear_list);
1063 INIT_WORK(&hub->tt.clear_work, hub_tt_work);
1064 switch (hdev->descriptor.bDeviceProtocol) {
1068 dev_dbg(hub_dev, "Single TT\n");
1072 ret = usb_set_interface(hdev, 0, 1);
1074 dev_dbg(hub_dev, "TT per port\n");
1077 dev_err(hub_dev, "Using single TT (err %d)\n",
1082 /* USB 3.0 hubs don't have a TT */
1085 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
1086 hdev->descriptor.bDeviceProtocol);
1090 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1091 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
1092 case HUB_TTTT_8_BITS:
1093 if (hdev->descriptor.bDeviceProtocol != 0) {
1094 hub->tt.think_time = 666;
1095 dev_dbg(hub_dev, "TT requires at most %d "
1096 "FS bit times (%d ns)\n",
1097 8, hub->tt.think_time);
1100 case HUB_TTTT_16_BITS:
1101 hub->tt.think_time = 666 * 2;
1102 dev_dbg(hub_dev, "TT requires at most %d "
1103 "FS bit times (%d ns)\n",
1104 16, hub->tt.think_time);
1106 case HUB_TTTT_24_BITS:
1107 hub->tt.think_time = 666 * 3;
1108 dev_dbg(hub_dev, "TT requires at most %d "
1109 "FS bit times (%d ns)\n",
1110 24, hub->tt.think_time);
1112 case HUB_TTTT_32_BITS:
1113 hub->tt.think_time = 666 * 4;
1114 dev_dbg(hub_dev, "TT requires at most %d "
1115 "FS bit times (%d ns)\n",
1116 32, hub->tt.think_time);
1120 /* probe() zeroes hub->indicator[] */
1121 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1122 hub->has_indicators = 1;
1123 dev_dbg(hub_dev, "Port indicators are supported\n");
1126 dev_dbg(hub_dev, "power on to power good time: %dms\n",
1127 hub->descriptor->bPwrOn2PwrGood * 2);
1129 /* power budgeting mostly matters with bus-powered hubs,
1130 * and battery-powered root hubs (may provide just 8 mA).
1132 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
1134 message = "can't get hub status";
1137 le16_to_cpus(&hubstatus);
1138 if (hdev == hdev->bus->root_hub) {
1139 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
1140 hub->mA_per_port = 500;
1142 hub->mA_per_port = hdev->bus_mA;
1143 hub->limited_power = 1;
1145 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1146 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
1147 hub->descriptor->bHubContrCurrent);
1148 hub->limited_power = 1;
1149 if (hdev->maxchild > 0) {
1150 int remaining = hdev->bus_mA -
1151 hub->descriptor->bHubContrCurrent;
1153 if (remaining < hdev->maxchild * 100)
1155 "insufficient power available "
1156 "to use all downstream ports\n");
1157 hub->mA_per_port = 100; /* 7.2.1.1 */
1159 } else { /* Self-powered external hub */
1160 /* FIXME: What about battery-powered external hubs that
1161 * provide less current per port? */
1162 hub->mA_per_port = 500;
1164 if (hub->mA_per_port < 500)
1165 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
1168 /* Update the HCD's internal representation of this hub before khubd
1169 * starts getting port status changes for devices under the hub.
1171 hcd = bus_to_hcd(hdev->bus);
1172 if (hcd->driver->update_hub_device) {
1173 ret = hcd->driver->update_hub_device(hcd, hdev,
1174 &hub->tt, GFP_KERNEL);
1176 message = "can't update HCD hub info";
1181 ret = hub_hub_status(hub, &hubstatus, &hubchange);
1183 message = "can't get hub status";
1187 /* local power status reports aren't always correct */
1188 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1189 dev_dbg(hub_dev, "local power source is %s\n",
1190 (hubstatus & HUB_STATUS_LOCAL_POWER)
1191 ? "lost (inactive)" : "good");
1193 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1194 dev_dbg(hub_dev, "%sover-current condition exists\n",
1195 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1197 /* set up the interrupt endpoint
1198 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1199 * bytes as USB2.0[11.12.3] says because some hubs are known
1200 * to send more data (and thus cause overflow). For root hubs,
1201 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1202 * to be big enough for at least USB_MAXCHILDREN ports. */
1203 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
1204 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
1206 if (maxp > sizeof(*hub->buffer))
1207 maxp = sizeof(*hub->buffer);
1209 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
1215 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
1216 hub, endpoint->bInterval);
1218 /* maybe cycle the hub leds */
1219 if (hub->has_indicators && blinkenlights)
1220 hub->indicator [0] = INDICATOR_CYCLE;
1222 hub_activate(hub, HUB_INIT);
1226 dev_err (hub_dev, "config failed, %s (err %d)\n",
1228 /* hub_disconnect() frees urb and descriptor */
1232 static void hub_release(struct kref *kref)
1234 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1236 usb_put_intf(to_usb_interface(hub->intfdev));
1240 static unsigned highspeed_hubs;
1242 static void hub_disconnect(struct usb_interface *intf)
1244 struct usb_hub *hub = usb_get_intfdata (intf);
1246 /* Take the hub off the event list and don't let it be added again */
1247 spin_lock_irq(&hub_event_lock);
1248 if (!list_empty(&hub->event_list)) {
1249 list_del_init(&hub->event_list);
1250 usb_autopm_put_interface_no_suspend(intf);
1252 hub->disconnected = 1;
1253 spin_unlock_irq(&hub_event_lock);
1255 /* Disconnect all children and quiesce the hub */
1257 hub_quiesce(hub, HUB_DISCONNECT);
1259 usb_set_intfdata (intf, NULL);
1260 hub->hdev->maxchild = 0;
1262 if (hub->hdev->speed == USB_SPEED_HIGH)
1265 usb_free_urb(hub->urb);
1266 kfree(hub->port_owners);
1267 kfree(hub->descriptor);
1271 kref_put(&hub->kref, hub_release);
1274 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1276 struct usb_host_interface *desc;
1277 struct usb_endpoint_descriptor *endpoint;
1278 struct usb_device *hdev;
1279 struct usb_hub *hub;
1281 desc = intf->cur_altsetting;
1282 hdev = interface_to_usbdev(intf);
1284 /* Hubs have proper suspend/resume support. USB 3.0 device suspend is
1285 * different from USB 2.0/1.1 device suspend, and unfortunately we
1286 * don't support it yet. So leave autosuspend disabled for USB 3.0
1287 * external hubs for now. Enable autosuspend for USB 3.0 roothubs,
1288 * since that isn't a "real" hub.
1290 if (!hub_is_superspeed(hdev) || !hdev->parent)
1291 usb_enable_autosuspend(hdev);
1293 if (hdev->level == MAX_TOPO_LEVEL) {
1295 "Unsupported bus topology: hub nested too deep\n");
1299 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1301 dev_warn(&intf->dev, "ignoring external hub\n");
1306 /* Some hubs have a subclass of 1, which AFAICT according to the */
1307 /* specs is not defined, but it works */
1308 if ((desc->desc.bInterfaceSubClass != 0) &&
1309 (desc->desc.bInterfaceSubClass != 1)) {
1311 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1315 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1316 if (desc->desc.bNumEndpoints != 1)
1317 goto descriptor_error;
1319 endpoint = &desc->endpoint[0].desc;
1321 /* If it's not an interrupt in endpoint, we'd better punt! */
1322 if (!usb_endpoint_is_int_in(endpoint))
1323 goto descriptor_error;
1325 /* We found a hub */
1326 dev_info (&intf->dev, "USB hub found\n");
1328 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1330 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1334 kref_init(&hub->kref);
1335 INIT_LIST_HEAD(&hub->event_list);
1336 hub->intfdev = &intf->dev;
1338 INIT_DELAYED_WORK(&hub->leds, led_work);
1339 INIT_DELAYED_WORK(&hub->init_work, NULL);
1342 usb_set_intfdata (intf, hub);
1343 intf->needs_remote_wakeup = 1;
1345 if (hdev->speed == USB_SPEED_HIGH)
1348 if (hub_configure(hub, endpoint) >= 0)
1351 hub_disconnect (intf);
1357 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1359 struct usb_device *hdev = interface_to_usbdev (intf);
1361 /* assert ifno == 0 (part of hub spec) */
1363 case USBDEVFS_HUB_PORTINFO: {
1364 struct usbdevfs_hub_portinfo *info = user_data;
1367 spin_lock_irq(&device_state_lock);
1368 if (hdev->devnum <= 0)
1371 info->nports = hdev->maxchild;
1372 for (i = 0; i < info->nports; i++) {
1373 if (hdev->children[i] == NULL)
1377 hdev->children[i]->devnum;
1380 spin_unlock_irq(&device_state_lock);
1382 return info->nports + 1;
1391 * Allow user programs to claim ports on a hub. When a device is attached
1392 * to one of these "claimed" ports, the program will "own" the device.
1394 static int find_port_owner(struct usb_device *hdev, unsigned port1,
1397 if (hdev->state == USB_STATE_NOTATTACHED)
1399 if (port1 == 0 || port1 > hdev->maxchild)
1402 /* This assumes that devices not managed by the hub driver
1403 * will always have maxchild equal to 0.
1405 *ppowner = &(hdev_to_hub(hdev)->port_owners[port1 - 1]);
1409 /* In the following three functions, the caller must hold hdev's lock */
1410 int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, void *owner)
1415 rc = find_port_owner(hdev, port1, &powner);
1424 int usb_hub_release_port(struct usb_device *hdev, unsigned port1, void *owner)
1429 rc = find_port_owner(hdev, port1, &powner);
1432 if (*powner != owner)
1438 void usb_hub_release_all_ports(struct usb_device *hdev, void *owner)
1443 n = find_port_owner(hdev, 1, &powner);
1445 for (; n < hdev->maxchild; (++n, ++powner)) {
1446 if (*powner == owner)
1452 /* The caller must hold udev's lock */
1453 bool usb_device_is_owned(struct usb_device *udev)
1455 struct usb_hub *hub;
1457 if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
1459 hub = hdev_to_hub(udev->parent);
1460 return !!hub->port_owners[udev->portnum - 1];
1464 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1468 for (i = 0; i < udev->maxchild; ++i) {
1469 if (udev->children[i])
1470 recursively_mark_NOTATTACHED(udev->children[i]);
1472 if (udev->state == USB_STATE_SUSPENDED)
1473 udev->active_duration -= jiffies;
1474 udev->state = USB_STATE_NOTATTACHED;
1478 * usb_set_device_state - change a device's current state (usbcore, hcds)
1479 * @udev: pointer to device whose state should be changed
1480 * @new_state: new state value to be stored
1482 * udev->state is _not_ fully protected by the device lock. Although
1483 * most transitions are made only while holding the lock, the state can
1484 * can change to USB_STATE_NOTATTACHED at almost any time. This
1485 * is so that devices can be marked as disconnected as soon as possible,
1486 * without having to wait for any semaphores to be released. As a result,
1487 * all changes to any device's state must be protected by the
1488 * device_state_lock spinlock.
1490 * Once a device has been added to the device tree, all changes to its state
1491 * should be made using this routine. The state should _not_ be set directly.
1493 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1494 * Otherwise udev->state is set to new_state, and if new_state is
1495 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1496 * to USB_STATE_NOTATTACHED.
1498 void usb_set_device_state(struct usb_device *udev,
1499 enum usb_device_state new_state)
1501 unsigned long flags;
1504 spin_lock_irqsave(&device_state_lock, flags);
1505 if (udev->state == USB_STATE_NOTATTACHED)
1507 else if (new_state != USB_STATE_NOTATTACHED) {
1509 /* root hub wakeup capabilities are managed out-of-band
1510 * and may involve silicon errata ... ignore them here.
1513 if (udev->state == USB_STATE_SUSPENDED
1514 || new_state == USB_STATE_SUSPENDED)
1515 ; /* No change to wakeup settings */
1516 else if (new_state == USB_STATE_CONFIGURED)
1517 wakeup = udev->actconfig->desc.bmAttributes
1518 & USB_CONFIG_ATT_WAKEUP;
1522 if (udev->state == USB_STATE_SUSPENDED &&
1523 new_state != USB_STATE_SUSPENDED)
1524 udev->active_duration -= jiffies;
1525 else if (new_state == USB_STATE_SUSPENDED &&
1526 udev->state != USB_STATE_SUSPENDED)
1527 udev->active_duration += jiffies;
1528 udev->state = new_state;
1530 recursively_mark_NOTATTACHED(udev);
1531 spin_unlock_irqrestore(&device_state_lock, flags);
1533 device_set_wakeup_capable(&udev->dev, wakeup);
1535 EXPORT_SYMBOL_GPL(usb_set_device_state);
1538 * Choose a device number.
1540 * Device numbers are used as filenames in usbfs. On USB-1.1 and
1541 * USB-2.0 buses they are also used as device addresses, however on
1542 * USB-3.0 buses the address is assigned by the controller hardware
1543 * and it usually is not the same as the device number.
1545 * WUSB devices are simple: they have no hubs behind, so the mapping
1546 * device <-> virtual port number becomes 1:1. Why? to simplify the
1547 * life of the device connection logic in
1548 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1549 * handshake we need to assign a temporary address in the unauthorized
1550 * space. For simplicity we use the first virtual port number found to
1551 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1552 * and that becomes it's address [X < 128] or its unauthorized address
1555 * We add 1 as an offset to the one-based USB-stack port number
1556 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1557 * 0 is reserved by USB for default address; (b) Linux's USB stack
1558 * uses always #1 for the root hub of the controller. So USB stack's
1559 * port #1, which is wusb virtual-port #0 has address #2.
1561 * Devices connected under xHCI are not as simple. The host controller
1562 * supports virtualization, so the hardware assigns device addresses and
1563 * the HCD must setup data structures before issuing a set address
1564 * command to the hardware.
1566 static void choose_devnum(struct usb_device *udev)
1569 struct usb_bus *bus = udev->bus;
1571 /* If khubd ever becomes multithreaded, this will need a lock */
1573 devnum = udev->portnum + 1;
1574 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1576 /* Try to allocate the next devnum beginning at
1577 * bus->devnum_next. */
1578 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1581 devnum = find_next_zero_bit(bus->devmap.devicemap,
1583 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1586 set_bit(devnum, bus->devmap.devicemap);
1587 udev->devnum = devnum;
1591 static void release_devnum(struct usb_device *udev)
1593 if (udev->devnum > 0) {
1594 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1599 static void update_devnum(struct usb_device *udev, int devnum)
1601 /* The address for a WUSB device is managed by wusbcore. */
1603 udev->devnum = devnum;
1606 static void hub_free_dev(struct usb_device *udev)
1608 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1610 /* Root hubs aren't real devices, so don't free HCD resources */
1611 if (hcd->driver->free_dev && udev->parent)
1612 hcd->driver->free_dev(hcd, udev);
1616 * usb_disconnect - disconnect a device (usbcore-internal)
1617 * @pdev: pointer to device being disconnected
1618 * Context: !in_interrupt ()
1620 * Something got disconnected. Get rid of it and all of its children.
1622 * If *pdev is a normal device then the parent hub must already be locked.
1623 * If *pdev is a root hub then this routine will acquire the
1624 * usb_bus_list_lock on behalf of the caller.
1626 * Only hub drivers (including virtual root hub drivers for host
1627 * controllers) should ever call this.
1629 * This call is synchronous, and may not be used in an interrupt context.
1631 void usb_disconnect(struct usb_device **pdev)
1633 struct usb_device *udev = *pdev;
1637 pr_debug ("%s nodev\n", __func__);
1641 /* mark the device as inactive, so any further urb submissions for
1642 * this device (and any of its children) will fail immediately.
1643 * this quiesces everything except pending urbs.
1645 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1646 dev_info(&udev->dev, "USB disconnect, device number %d\n",
1649 usb_lock_device(udev);
1651 /* Free up all the children before we remove this device */
1652 for (i = 0; i < USB_MAXCHILDREN; i++) {
1653 if (udev->children[i])
1654 usb_disconnect(&udev->children[i]);
1657 /* deallocate hcd/hardware state ... nuking all pending urbs and
1658 * cleaning up all state associated with the current configuration
1659 * so that the hardware is now fully quiesced.
1661 dev_dbg (&udev->dev, "unregistering device\n");
1662 usb_disable_device(udev, 0);
1663 usb_hcd_synchronize_unlinks(udev);
1665 usb_remove_ep_devs(&udev->ep0);
1666 usb_unlock_device(udev);
1668 /* Unregister the device. The device driver is responsible
1669 * for de-configuring the device and invoking the remove-device
1670 * notifier chain (used by usbfs and possibly others).
1672 device_del(&udev->dev);
1674 /* Free the device number and delete the parent's children[]
1675 * (or root_hub) pointer.
1677 release_devnum(udev);
1679 /* Avoid races with recursively_mark_NOTATTACHED() */
1680 spin_lock_irq(&device_state_lock);
1682 spin_unlock_irq(&device_state_lock);
1686 put_device(&udev->dev);
1689 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1690 static void show_string(struct usb_device *udev, char *id, char *string)
1694 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1697 static void announce_device(struct usb_device *udev)
1699 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1700 le16_to_cpu(udev->descriptor.idVendor),
1701 le16_to_cpu(udev->descriptor.idProduct));
1702 dev_info(&udev->dev,
1703 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1704 udev->descriptor.iManufacturer,
1705 udev->descriptor.iProduct,
1706 udev->descriptor.iSerialNumber);
1707 show_string(udev, "Product", udev->product);
1708 show_string(udev, "Manufacturer", udev->manufacturer);
1709 show_string(udev, "SerialNumber", udev->serial);
1712 static inline void announce_device(struct usb_device *udev) { }
1715 #ifdef CONFIG_USB_OTG
1716 #include "otg_whitelist.h"
1720 * usb_enumerate_device_otg - FIXME (usbcore-internal)
1721 * @udev: newly addressed device (in ADDRESS state)
1723 * Finish enumeration for On-The-Go devices
1725 static int usb_enumerate_device_otg(struct usb_device *udev)
1729 #ifdef CONFIG_USB_OTG
1731 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1732 * to wake us after we've powered off VBUS; and HNP, switching roles
1733 * "host" to "peripheral". The OTG descriptor helps figure this out.
1735 if (!udev->bus->is_b_host
1737 && udev->parent == udev->bus->root_hub) {
1738 struct usb_otg_descriptor *desc = NULL;
1739 struct usb_bus *bus = udev->bus;
1741 /* descriptor may appear anywhere in config */
1742 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1743 le16_to_cpu(udev->config[0].desc.wTotalLength),
1744 USB_DT_OTG, (void **) &desc) == 0) {
1745 if (desc->bmAttributes & USB_OTG_HNP) {
1746 unsigned port1 = udev->portnum;
1748 dev_info(&udev->dev,
1749 "Dual-Role OTG device on %sHNP port\n",
1750 (port1 == bus->otg_port)
1753 /* enable HNP before suspend, it's simpler */
1754 if (port1 == bus->otg_port)
1755 bus->b_hnp_enable = 1;
1756 err = usb_control_msg(udev,
1757 usb_sndctrlpipe(udev, 0),
1758 USB_REQ_SET_FEATURE, 0,
1760 ? USB_DEVICE_B_HNP_ENABLE
1761 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1762 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1764 /* OTG MESSAGE: report errors here,
1765 * customize to match your product.
1767 dev_info(&udev->dev,
1768 "can't set HNP mode: %d\n",
1770 bus->b_hnp_enable = 0;
1776 if (!is_targeted(udev)) {
1778 /* Maybe it can talk to us, though we can't talk to it.
1779 * (Includes HNP test device.)
1781 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1782 err = usb_port_suspend(udev, PMSG_SUSPEND);
1784 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1796 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
1797 * @udev: newly addressed device (in ADDRESS state)
1799 * This is only called by usb_new_device() and usb_authorize_device()
1800 * and FIXME -- all comments that apply to them apply here wrt to
1803 * If the device is WUSB and not authorized, we don't attempt to read
1804 * the string descriptors, as they will be errored out by the device
1805 * until it has been authorized.
1807 static int usb_enumerate_device(struct usb_device *udev)
1811 if (udev->config == NULL) {
1812 err = usb_get_configuration(udev);
1814 dev_err(&udev->dev, "can't read configurations, error %d\n",
1819 if (udev->wusb == 1 && udev->authorized == 0) {
1820 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1821 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1822 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1825 /* read the standard strings and cache them if present */
1826 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1827 udev->manufacturer = usb_cache_string(udev,
1828 udev->descriptor.iManufacturer);
1829 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1831 err = usb_enumerate_device_otg(udev);
1838 * usb_new_device - perform initial device setup (usbcore-internal)
1839 * @udev: newly addressed device (in ADDRESS state)
1841 * This is called with devices which have been detected but not fully
1842 * enumerated. The device descriptor is available, but not descriptors
1843 * for any device configuration. The caller must have locked either
1844 * the parent hub (if udev is a normal device) or else the
1845 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1846 * udev has already been installed, but udev is not yet visible through
1847 * sysfs or other filesystem code.
1849 * It will return if the device is configured properly or not. Zero if
1850 * the interface was registered with the driver core; else a negative
1853 * This call is synchronous, and may not be used in an interrupt context.
1855 * Only the hub driver or root-hub registrar should ever call this.
1857 int usb_new_device(struct usb_device *udev)
1862 /* Initialize non-root-hub device wakeup to disabled;
1863 * device (un)configuration controls wakeup capable
1864 * sysfs power/wakeup controls wakeup enabled/disabled
1866 device_init_wakeup(&udev->dev, 0);
1869 /* Tell the runtime-PM framework the device is active */
1870 pm_runtime_set_active(&udev->dev);
1871 pm_runtime_get_noresume(&udev->dev);
1872 pm_runtime_use_autosuspend(&udev->dev);
1873 pm_runtime_enable(&udev->dev);
1875 /* By default, forbid autosuspend for all devices. It will be
1876 * allowed for hubs during binding.
1878 usb_disable_autosuspend(udev);
1880 err = usb_enumerate_device(udev); /* Read descriptors */
1883 dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
1884 udev->devnum, udev->bus->busnum,
1885 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1886 /* export the usbdev device-node for libusb */
1887 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1888 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1890 /* Tell the world! */
1891 announce_device(udev);
1893 device_enable_async_suspend(&udev->dev);
1894 /* Register the device. The device driver is responsible
1895 * for configuring the device and invoking the add-device
1896 * notifier chain (used by usbfs and possibly others).
1898 err = device_add(&udev->dev);
1900 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1904 (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
1905 usb_mark_last_busy(udev);
1906 pm_runtime_put_sync_autosuspend(&udev->dev);
1910 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1911 pm_runtime_disable(&udev->dev);
1912 pm_runtime_set_suspended(&udev->dev);
1918 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1919 * @usb_dev: USB device
1921 * Move the USB device to a very basic state where interfaces are disabled
1922 * and the device is in fact unconfigured and unusable.
1924 * We share a lock (that we have) with device_del(), so we need to
1927 int usb_deauthorize_device(struct usb_device *usb_dev)
1929 usb_lock_device(usb_dev);
1930 if (usb_dev->authorized == 0)
1931 goto out_unauthorized;
1933 usb_dev->authorized = 0;
1934 usb_set_configuration(usb_dev, -1);
1936 kfree(usb_dev->product);
1937 usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1938 kfree(usb_dev->manufacturer);
1939 usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1940 kfree(usb_dev->serial);
1941 usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1943 usb_destroy_configuration(usb_dev);
1944 usb_dev->descriptor.bNumConfigurations = 0;
1947 usb_unlock_device(usb_dev);
1952 int usb_authorize_device(struct usb_device *usb_dev)
1956 usb_lock_device(usb_dev);
1957 if (usb_dev->authorized == 1)
1958 goto out_authorized;
1960 result = usb_autoresume_device(usb_dev);
1962 dev_err(&usb_dev->dev,
1963 "can't autoresume for authorization: %d\n", result);
1964 goto error_autoresume;
1966 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1968 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1969 "authorization: %d\n", result);
1970 goto error_device_descriptor;
1973 kfree(usb_dev->product);
1974 usb_dev->product = NULL;
1975 kfree(usb_dev->manufacturer);
1976 usb_dev->manufacturer = NULL;
1977 kfree(usb_dev->serial);
1978 usb_dev->serial = NULL;
1980 usb_dev->authorized = 1;
1981 result = usb_enumerate_device(usb_dev);
1983 goto error_enumerate;
1984 /* Choose and set the configuration. This registers the interfaces
1985 * with the driver core and lets interface drivers bind to them.
1987 c = usb_choose_configuration(usb_dev);
1989 result = usb_set_configuration(usb_dev, c);
1991 dev_err(&usb_dev->dev,
1992 "can't set config #%d, error %d\n", c, result);
1993 /* This need not be fatal. The user can try to
1994 * set other configurations. */
1997 dev_info(&usb_dev->dev, "authorized to connect\n");
2000 error_device_descriptor:
2001 usb_autosuspend_device(usb_dev);
2004 usb_unlock_device(usb_dev); // complements locktree
2009 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2010 static unsigned hub_is_wusb(struct usb_hub *hub)
2012 struct usb_hcd *hcd;
2013 if (hub->hdev->parent != NULL) /* not a root hub? */
2015 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
2016 return hcd->wireless;
2020 #define PORT_RESET_TRIES 5
2021 #define SET_ADDRESS_TRIES 2
2022 #define GET_DESCRIPTOR_TRIES 2
2023 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2024 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
2026 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
2027 #define HUB_SHORT_RESET_TIME 10
2028 #define HUB_LONG_RESET_TIME 200
2029 #define HUB_RESET_TIMEOUT 500
2031 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
2032 struct usb_device *udev, unsigned int delay)
2034 int delay_time, ret;
2038 for (delay_time = 0;
2039 delay_time < HUB_RESET_TIMEOUT;
2040 delay_time += delay) {
2041 /* wait to give the device a chance to reset */
2044 /* read and decode port status */
2045 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2049 /* Device went away? */
2050 if (!(portstatus & USB_PORT_STAT_CONNECTION))
2053 /* bomb out completely if the connection bounced */
2054 if ((portchange & USB_PORT_STAT_C_CONNECTION))
2057 /* if we`ve finished resetting, then break out of the loop */
2058 if (!(portstatus & USB_PORT_STAT_RESET) &&
2059 (portstatus & USB_PORT_STAT_ENABLE)) {
2060 if (hub_is_wusb(hub))
2061 udev->speed = USB_SPEED_WIRELESS;
2062 else if (hub_is_superspeed(hub->hdev))
2063 udev->speed = USB_SPEED_SUPER;
2064 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
2065 udev->speed = USB_SPEED_HIGH;
2066 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
2067 udev->speed = USB_SPEED_LOW;
2069 udev->speed = USB_SPEED_FULL;
2073 /* switch to the long delay after two short delay failures */
2074 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
2075 delay = HUB_LONG_RESET_TIME;
2077 dev_dbg (hub->intfdev,
2078 "port %d not reset yet, waiting %dms\n",
2085 static int hub_port_reset(struct usb_hub *hub, int port1,
2086 struct usb_device *udev, unsigned int delay)
2089 struct usb_hcd *hcd;
2091 hcd = bus_to_hcd(udev->bus);
2092 /* Block EHCI CF initialization during the port reset.
2093 * Some companion controllers don't like it when they mix.
2095 down_read(&ehci_cf_port_reset_rwsem);
2097 /* Reset the port */
2098 for (i = 0; i < PORT_RESET_TRIES; i++) {
2099 status = set_port_feature(hub->hdev,
2100 port1, USB_PORT_FEAT_RESET);
2102 dev_err(hub->intfdev,
2103 "cannot reset port %d (err = %d)\n",
2106 status = hub_port_wait_reset(hub, port1, udev, delay);
2107 if (status && status != -ENOTCONN)
2108 dev_dbg(hub->intfdev,
2109 "port_wait_reset: err = %d\n",
2113 /* return on disconnect or reset */
2116 /* TRSTRCY = 10 ms; plus some extra */
2118 update_devnum(udev, 0);
2119 if (hcd->driver->reset_device) {
2120 status = hcd->driver->reset_device(hcd, udev);
2122 dev_err(&udev->dev, "Cannot reset "
2123 "HCD device state\n");
2130 clear_port_feature(hub->hdev,
2131 port1, USB_PORT_FEAT_C_RESET);
2132 /* FIXME need disconnect() for NOTATTACHED device */
2133 usb_set_device_state(udev, status
2134 ? USB_STATE_NOTATTACHED
2135 : USB_STATE_DEFAULT);
2139 dev_dbg (hub->intfdev,
2140 "port %d not enabled, trying reset again...\n",
2142 delay = HUB_LONG_RESET_TIME;
2145 dev_err (hub->intfdev,
2146 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2150 up_read(&ehci_cf_port_reset_rwsem);
2154 /* Warm reset a USB3 protocol port */
2155 static int hub_port_warm_reset(struct usb_hub *hub, int port)
2158 u16 portstatus, portchange;
2160 if (!hub_is_superspeed(hub->hdev)) {
2161 dev_err(hub->intfdev, "only USB3 hub support warm reset\n");
2165 /* Warm reset the port */
2166 ret = set_port_feature(hub->hdev,
2167 port, USB_PORT_FEAT_BH_PORT_RESET);
2169 dev_err(hub->intfdev, "cannot warm reset port %d\n", port);
2174 ret = hub_port_status(hub, port, &portstatus, &portchange);
2176 if (portchange & USB_PORT_STAT_C_RESET)
2177 clear_port_feature(hub->hdev, port, USB_PORT_FEAT_C_RESET);
2179 if (portchange & USB_PORT_STAT_C_BH_RESET)
2180 clear_port_feature(hub->hdev, port,
2181 USB_PORT_FEAT_C_BH_PORT_RESET);
2183 if (portchange & USB_PORT_STAT_C_LINK_STATE)
2184 clear_port_feature(hub->hdev, port,
2185 USB_PORT_FEAT_C_PORT_LINK_STATE);
2190 /* Check if a port is power on */
2191 static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
2195 if (hub_is_superspeed(hub->hdev)) {
2196 if (portstatus & USB_SS_PORT_STAT_POWER)
2199 if (portstatus & USB_PORT_STAT_POWER)
2208 /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
2209 static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
2213 if (hub_is_superspeed(hub->hdev)) {
2214 if ((portstatus & USB_PORT_STAT_LINK_STATE)
2215 == USB_SS_PORT_LS_U3)
2218 if (portstatus & USB_PORT_STAT_SUSPEND)
2225 /* Determine whether the device on a port is ready for a normal resume,
2226 * is ready for a reset-resume, or should be disconnected.
2228 static int check_port_resume_type(struct usb_device *udev,
2229 struct usb_hub *hub, int port1,
2230 int status, unsigned portchange, unsigned portstatus)
2232 /* Is the device still present? */
2233 if (status || port_is_suspended(hub, portstatus) ||
2234 !port_is_power_on(hub, portstatus) ||
2235 !(portstatus & USB_PORT_STAT_CONNECTION)) {
2240 /* Can't do a normal resume if the port isn't enabled,
2241 * so try a reset-resume instead.
2243 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
2244 if (udev->persist_enabled)
2245 udev->reset_resume = 1;
2251 dev_dbg(hub->intfdev,
2252 "port %d status %04x.%04x after resume, %d\n",
2253 port1, portchange, portstatus, status);
2254 } else if (udev->reset_resume) {
2256 /* Late port handoff can set status-change bits */
2257 if (portchange & USB_PORT_STAT_C_CONNECTION)
2258 clear_port_feature(hub->hdev, port1,
2259 USB_PORT_FEAT_C_CONNECTION);
2260 if (portchange & USB_PORT_STAT_C_ENABLE)
2261 clear_port_feature(hub->hdev, port1,
2262 USB_PORT_FEAT_C_ENABLE);
2268 #ifdef CONFIG_USB_SUSPEND
2271 * usb_port_suspend - suspend a usb device's upstream port
2272 * @udev: device that's no longer in active use, not a root hub
2273 * Context: must be able to sleep; device not locked; pm locks held
2275 * Suspends a USB device that isn't in active use, conserving power.
2276 * Devices may wake out of a suspend, if anything important happens,
2277 * using the remote wakeup mechanism. They may also be taken out of
2278 * suspend by the host, using usb_port_resume(). It's also routine
2279 * to disconnect devices while they are suspended.
2281 * This only affects the USB hardware for a device; its interfaces
2282 * (and, for hubs, child devices) must already have been suspended.
2284 * Selective port suspend reduces power; most suspended devices draw
2285 * less than 500 uA. It's also used in OTG, along with remote wakeup.
2286 * All devices below the suspended port are also suspended.
2288 * Devices leave suspend state when the host wakes them up. Some devices
2289 * also support "remote wakeup", where the device can activate the USB
2290 * tree above them to deliver data, such as a keypress or packet. In
2291 * some cases, this wakes the USB host.
2293 * Suspending OTG devices may trigger HNP, if that's been enabled
2294 * between a pair of dual-role devices. That will change roles, such
2295 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2297 * Devices on USB hub ports have only one "suspend" state, corresponding
2298 * to ACPI D2, "may cause the device to lose some context".
2299 * State transitions include:
2301 * - suspend, resume ... when the VBUS power link stays live
2302 * - suspend, disconnect ... VBUS lost
2304 * Once VBUS drop breaks the circuit, the port it's using has to go through
2305 * normal re-enumeration procedures, starting with enabling VBUS power.
2306 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2307 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
2308 * timer, no SRP, no requests through sysfs.
2310 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
2311 * the root hub for their bus goes into global suspend ... so we don't
2312 * (falsely) update the device power state to say it suspended.
2314 * Returns 0 on success, else negative errno.
2316 int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
2318 struct usb_hub *hub = hdev_to_hub(udev->parent);
2319 int port1 = udev->portnum;
2322 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
2324 /* enable remote wakeup when appropriate; this lets the device
2325 * wake up the upstream hub (including maybe the root hub).
2327 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
2328 * we don't explicitly enable it here.
2330 if (udev->do_remote_wakeup) {
2331 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2332 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
2333 USB_DEVICE_REMOTE_WAKEUP, 0,
2335 USB_CTRL_SET_TIMEOUT);
2337 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
2339 /* bail if autosuspend is requested */
2340 if (msg.event & PM_EVENT_AUTO)
2346 if (hub_is_superspeed(hub->hdev))
2347 status = set_port_feature(hub->hdev,
2348 port1 | (USB_SS_PORT_LS_U3 << 3),
2349 USB_PORT_FEAT_LINK_STATE);
2351 status = set_port_feature(hub->hdev, port1,
2352 USB_PORT_FEAT_SUSPEND);
2354 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
2356 /* paranoia: "should not happen" */
2357 if (udev->do_remote_wakeup)
2358 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2359 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
2360 USB_DEVICE_REMOTE_WAKEUP, 0,
2362 USB_CTRL_SET_TIMEOUT);
2364 /* device has up to 10 msec to fully suspend */
2365 dev_dbg(&udev->dev, "usb %ssuspend\n",
2366 (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
2367 usb_set_device_state(udev, USB_STATE_SUSPENDED);
2370 usb_mark_last_busy(hub->hdev);
2375 * If the USB "suspend" state is in use (rather than "global suspend"),
2376 * many devices will be individually taken out of suspend state using
2377 * special "resume" signaling. This routine kicks in shortly after
2378 * hardware resume signaling is finished, either because of selective
2379 * resume (by host) or remote wakeup (by device) ... now see what changed
2380 * in the tree that's rooted at this device.
2382 * If @udev->reset_resume is set then the device is reset before the
2383 * status check is done.
2385 static int finish_port_resume(struct usb_device *udev)
2390 /* caller owns the udev device lock */
2391 dev_dbg(&udev->dev, "%s\n",
2392 udev->reset_resume ? "finish reset-resume" : "finish resume");
2394 /* usb ch9 identifies four variants of SUSPENDED, based on what
2395 * state the device resumes to. Linux currently won't see the
2396 * first two on the host side; they'd be inside hub_port_init()
2397 * during many timeouts, but khubd can't suspend until later.
2399 usb_set_device_state(udev, udev->actconfig
2400 ? USB_STATE_CONFIGURED
2401 : USB_STATE_ADDRESS);
2403 /* 10.5.4.5 says not to reset a suspended port if the attached
2404 * device is enabled for remote wakeup. Hence the reset
2405 * operation is carried out here, after the port has been
2408 if (udev->reset_resume)
2410 status = usb_reset_and_verify_device(udev);
2412 /* 10.5.4.5 says be sure devices in the tree are still there.
2413 * For now let's assume the device didn't go crazy on resume,
2414 * and device drivers will know about any resume quirks.
2418 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
2420 status = (status > 0 ? 0 : -ENODEV);
2422 /* If a normal resume failed, try doing a reset-resume */
2423 if (status && !udev->reset_resume && udev->persist_enabled) {
2424 dev_dbg(&udev->dev, "retry with reset-resume\n");
2425 udev->reset_resume = 1;
2426 goto retry_reset_resume;
2431 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
2433 } else if (udev->actconfig) {
2434 le16_to_cpus(&devstatus);
2435 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
2436 status = usb_control_msg(udev,
2437 usb_sndctrlpipe(udev, 0),
2438 USB_REQ_CLEAR_FEATURE,
2440 USB_DEVICE_REMOTE_WAKEUP, 0,
2442 USB_CTRL_SET_TIMEOUT);
2445 "disable remote wakeup, status %d\n",
2454 * usb_port_resume - re-activate a suspended usb device's upstream port
2455 * @udev: device to re-activate, not a root hub
2456 * Context: must be able to sleep; device not locked; pm locks held
2458 * This will re-activate the suspended device, increasing power usage
2459 * while letting drivers communicate again with its endpoints.
2460 * USB resume explicitly guarantees that the power session between
2461 * the host and the device is the same as it was when the device
2464 * If @udev->reset_resume is set then this routine won't check that the
2465 * port is still enabled. Furthermore, finish_port_resume() above will
2466 * reset @udev. The end result is that a broken power session can be
2467 * recovered and @udev will appear to persist across a loss of VBUS power.
2469 * For example, if a host controller doesn't maintain VBUS suspend current
2470 * during a system sleep or is reset when the system wakes up, all the USB
2471 * power sessions below it will be broken. This is especially troublesome
2472 * for mass-storage devices containing mounted filesystems, since the
2473 * device will appear to have disconnected and all the memory mappings
2474 * to it will be lost. Using the USB_PERSIST facility, the device can be
2475 * made to appear as if it had not disconnected.
2477 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
2478 * every effort to insure that the same device is present after the
2479 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2480 * quite possible for a device to remain unaltered but its media to be
2481 * changed. If the user replaces a flash memory card while the system is
2482 * asleep, he will have only himself to blame when the filesystem on the
2483 * new card is corrupted and the system crashes.
2485 * Returns 0 on success, else negative errno.
2487 int usb_port_resume(struct usb_device *udev, pm_message_t msg)
2489 struct usb_hub *hub = hdev_to_hub(udev->parent);
2490 int port1 = udev->portnum;
2492 u16 portchange, portstatus;
2494 /* Skip the initial Clear-Suspend step for a remote wakeup */
2495 status = hub_port_status(hub, port1, &portstatus, &portchange);
2496 if (status == 0 && !port_is_suspended(hub, portstatus))
2497 goto SuspendCleared;
2499 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2501 set_bit(port1, hub->busy_bits);
2503 /* see 7.1.7.7; affects power usage, but not budgeting */
2504 if (hub_is_superspeed(hub->hdev))
2505 status = set_port_feature(hub->hdev,
2506 port1 | (USB_SS_PORT_LS_U0 << 3),
2507 USB_PORT_FEAT_LINK_STATE);
2509 status = clear_port_feature(hub->hdev,
2510 port1, USB_PORT_FEAT_SUSPEND);
2512 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
2515 /* drive resume for at least 20 msec */
2516 dev_dbg(&udev->dev, "usb %sresume\n",
2517 (msg.event & PM_EVENT_AUTO ? "auto-" : ""));
2520 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2521 * stop resume signaling. Then finish the resume
2524 status = hub_port_status(hub, port1, &portstatus, &portchange);
2526 /* TRSMRCY = 10 msec */
2532 if (hub_is_superspeed(hub->hdev)) {
2533 if (portchange & USB_PORT_STAT_C_LINK_STATE)
2534 clear_port_feature(hub->hdev, port1,
2535 USB_PORT_FEAT_C_PORT_LINK_STATE);
2537 if (portchange & USB_PORT_STAT_C_SUSPEND)
2538 clear_port_feature(hub->hdev, port1,
2539 USB_PORT_FEAT_C_SUSPEND);
2543 clear_bit(port1, hub->busy_bits);
2545 status = check_port_resume_type(udev,
2546 hub, port1, status, portchange, portstatus);
2548 status = finish_port_resume(udev);
2550 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2551 hub_port_logical_disconnect(hub, port1);
2556 /* caller has locked udev */
2557 int usb_remote_wakeup(struct usb_device *udev)
2561 if (udev->state == USB_STATE_SUSPENDED) {
2562 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
2563 status = usb_autoresume_device(udev);
2565 /* Let the drivers do their thing, then... */
2566 usb_autosuspend_device(udev);
2572 #else /* CONFIG_USB_SUSPEND */
2574 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2576 int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
2581 /* However we may need to do a reset-resume */
2583 int usb_port_resume(struct usb_device *udev, pm_message_t msg)
2585 struct usb_hub *hub = hdev_to_hub(udev->parent);
2586 int port1 = udev->portnum;
2588 u16 portchange, portstatus;
2590 status = hub_port_status(hub, port1, &portstatus, &portchange);
2591 status = check_port_resume_type(udev,
2592 hub, port1, status, portchange, portstatus);
2595 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2596 hub_port_logical_disconnect(hub, port1);
2597 } else if (udev->reset_resume) {
2598 dev_dbg(&udev->dev, "reset-resume\n");
2599 status = usb_reset_and_verify_device(udev);
2606 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
2608 struct usb_hub *hub = usb_get_intfdata (intf);
2609 struct usb_device *hdev = hub->hdev;
2612 /* fail if children aren't already suspended */
2613 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2614 struct usb_device *udev;
2616 udev = hdev->children [port1-1];
2617 if (udev && udev->can_submit) {
2618 if (!(msg.event & PM_EVENT_AUTO))
2619 dev_dbg(&intf->dev, "port %d nyet suspended\n",
2625 dev_dbg(&intf->dev, "%s\n", __func__);
2627 /* stop khubd and related activity */
2628 hub_quiesce(hub, HUB_SUSPEND);
2632 static int hub_resume(struct usb_interface *intf)
2634 struct usb_hub *hub = usb_get_intfdata(intf);
2636 dev_dbg(&intf->dev, "%s\n", __func__);
2637 hub_activate(hub, HUB_RESUME);
2641 static int hub_reset_resume(struct usb_interface *intf)
2643 struct usb_hub *hub = usb_get_intfdata(intf);
2645 dev_dbg(&intf->dev, "%s\n", __func__);
2646 hub_activate(hub, HUB_RESET_RESUME);
2651 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2652 * @rhdev: struct usb_device for the root hub
2654 * The USB host controller driver calls this function when its root hub
2655 * is resumed and Vbus power has been interrupted or the controller
2656 * has been reset. The routine marks @rhdev as having lost power.
2657 * When the hub driver is resumed it will take notice and carry out
2658 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2659 * the others will be disconnected.
2661 void usb_root_hub_lost_power(struct usb_device *rhdev)
2663 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2664 rhdev->reset_resume = 1;
2666 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2668 #else /* CONFIG_PM */
2670 #define hub_suspend NULL
2671 #define hub_resume NULL
2672 #define hub_reset_resume NULL
2676 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2678 * Between connect detection and reset signaling there must be a delay
2679 * of 100ms at least for debounce and power-settling. The corresponding
2680 * timer shall restart whenever the downstream port detects a disconnect.
2682 * Apparently there are some bluetooth and irda-dongles and a number of
2683 * low-speed devices for which this debounce period may last over a second.
2684 * Not covered by the spec - but easy to deal with.
2686 * This implementation uses a 1500ms total debounce timeout; if the
2687 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2688 * every 25ms for transient disconnects. When the port status has been
2689 * unchanged for 100ms it returns the port status.
2691 static int hub_port_debounce(struct usb_hub *hub, int port1)
2694 int total_time, stable_time = 0;
2695 u16 portchange, portstatus;
2696 unsigned connection = 0xffff;
2698 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2699 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2703 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2704 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2705 stable_time += HUB_DEBOUNCE_STEP;
2706 if (stable_time >= HUB_DEBOUNCE_STABLE)
2710 connection = portstatus & USB_PORT_STAT_CONNECTION;
2713 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2714 clear_port_feature(hub->hdev, port1,
2715 USB_PORT_FEAT_C_CONNECTION);
2718 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2720 msleep(HUB_DEBOUNCE_STEP);
2723 dev_dbg (hub->intfdev,
2724 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2725 port1, total_time, stable_time, portstatus);
2727 if (stable_time < HUB_DEBOUNCE_STABLE)
2732 void usb_ep0_reinit(struct usb_device *udev)
2734 usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
2735 usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
2736 usb_enable_endpoint(udev, &udev->ep0, true);
2738 EXPORT_SYMBOL_GPL(usb_ep0_reinit);
2740 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2741 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2743 static int hub_set_address(struct usb_device *udev, int devnum)
2746 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2749 * The host controller will choose the device address,
2750 * instead of the core having chosen it earlier
2752 if (!hcd->driver->address_device && devnum <= 1)
2754 if (udev->state == USB_STATE_ADDRESS)
2756 if (udev->state != USB_STATE_DEFAULT)
2758 if (hcd->driver->address_device)
2759 retval = hcd->driver->address_device(hcd, udev);
2761 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2762 USB_REQ_SET_ADDRESS, 0, devnum, 0,
2763 NULL, 0, USB_CTRL_SET_TIMEOUT);
2765 update_devnum(udev, devnum);
2766 /* Device now using proper address. */
2767 usb_set_device_state(udev, USB_STATE_ADDRESS);
2768 usb_ep0_reinit(udev);
2773 /* Reset device, (re)assign address, get device descriptor.
2774 * Device connection must be stable, no more debouncing needed.
2775 * Returns device in USB_STATE_ADDRESS, except on error.
2777 * If this is called for an already-existing device (as part of
2778 * usb_reset_and_verify_device), the caller must own the device lock. For a
2779 * newly detected device that is not accessible through any global
2780 * pointers, it's not necessary to lock the device.
2783 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2786 static DEFINE_MUTEX(usb_address0_mutex);
2788 struct usb_device *hdev = hub->hdev;
2789 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
2791 unsigned delay = HUB_SHORT_RESET_TIME;
2792 enum usb_device_speed oldspeed = udev->speed;
2794 int devnum = udev->devnum;
2796 /* root hub ports have a slightly longer reset period
2797 * (from USB 2.0 spec, section 7.1.7.5)
2799 if (!hdev->parent) {
2800 delay = HUB_ROOT_RESET_TIME;
2801 if (port1 == hdev->bus->otg_port)
2802 hdev->bus->b_hnp_enable = 0;
2805 /* Some low speed devices have problems with the quick delay, so */
2806 /* be a bit pessimistic with those devices. RHbug #23670 */
2807 if (oldspeed == USB_SPEED_LOW)
2808 delay = HUB_LONG_RESET_TIME;
2810 mutex_lock(&usb_address0_mutex);
2812 /* Reset the device; full speed may morph to high speed */
2813 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
2814 retval = hub_port_reset(hub, port1, udev, delay);
2815 if (retval < 0) /* error or disconnect */
2817 /* success, speed is known */
2821 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2822 dev_dbg(&udev->dev, "device reset changed speed!\n");
2825 oldspeed = udev->speed;
2827 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2828 * it's fixed size except for full speed devices.
2829 * For Wireless USB devices, ep0 max packet is always 512 (tho
2830 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2832 switch (udev->speed) {
2833 case USB_SPEED_SUPER:
2834 case USB_SPEED_WIRELESS: /* fixed at 512 */
2835 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
2837 case USB_SPEED_HIGH: /* fixed at 64 */
2838 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
2840 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2841 /* to determine the ep0 maxpacket size, try to read
2842 * the device descriptor to get bMaxPacketSize0 and
2843 * then correct our initial guess.
2845 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
2847 case USB_SPEED_LOW: /* fixed at 8 */
2848 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
2855 switch (udev->speed) {
2856 case USB_SPEED_LOW: speed = "low"; break;
2857 case USB_SPEED_FULL: speed = "full"; break;
2858 case USB_SPEED_HIGH: speed = "high"; break;
2859 case USB_SPEED_SUPER:
2862 case USB_SPEED_WIRELESS:
2866 default: speed = "?"; break;
2868 if (udev->speed != USB_SPEED_SUPER)
2869 dev_info(&udev->dev,
2870 "%s %s speed %sUSB device number %d using %s\n",
2871 (udev->config) ? "reset" : "new", speed, type,
2872 devnum, udev->bus->controller->driver->name);
2874 /* Set up TT records, if needed */
2876 udev->tt = hdev->tt;
2877 udev->ttport = hdev->ttport;
2878 } else if (udev->speed != USB_SPEED_HIGH
2879 && hdev->speed == USB_SPEED_HIGH) {
2881 dev_err(&udev->dev, "parent hub has no TT\n");
2885 udev->tt = &hub->tt;
2886 udev->ttport = port1;
2889 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2890 * Because device hardware and firmware is sometimes buggy in
2891 * this area, and this is how Linux has done it for ages.
2892 * Change it cautiously.
2894 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2895 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2896 * so it may help with some non-standards-compliant devices.
2897 * Otherwise we start with SET_ADDRESS and then try to read the
2898 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2901 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2902 if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) {
2903 struct usb_device_descriptor *buf;
2906 #define GET_DESCRIPTOR_BUFSIZE 64
2907 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2913 /* Retry on all errors; some devices are flakey.
2914 * 255 is for WUSB devices, we actually need to use
2915 * 512 (WUSB1.0[4.8.1]).
2917 for (j = 0; j < 3; ++j) {
2918 buf->bMaxPacketSize0 = 0;
2919 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2920 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2921 USB_DT_DEVICE << 8, 0,
2922 buf, GET_DESCRIPTOR_BUFSIZE,
2923 initial_descriptor_timeout);
2924 switch (buf->bMaxPacketSize0) {
2925 case 8: case 16: case 32: case 64: case 255:
2926 if (buf->bDescriptorType ==
2940 udev->descriptor.bMaxPacketSize0 =
2941 buf->bMaxPacketSize0;
2944 retval = hub_port_reset(hub, port1, udev, delay);
2945 if (retval < 0) /* error or disconnect */
2947 if (oldspeed != udev->speed) {
2949 "device reset changed speed!\n");
2955 "device descriptor read/64, error %d\n",
2960 #undef GET_DESCRIPTOR_BUFSIZE
2964 * If device is WUSB, we already assigned an
2965 * unauthorized address in the Connect Ack sequence;
2966 * authorization will assign the final address.
2968 if (udev->wusb == 0) {
2969 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2970 retval = hub_set_address(udev, devnum);
2977 "device not accepting address %d, error %d\n",
2981 if (udev->speed == USB_SPEED_SUPER) {
2982 devnum = udev->devnum;
2983 dev_info(&udev->dev,
2984 "%s SuperSpeed USB device number %d using %s\n",
2985 (udev->config) ? "reset" : "new",
2986 devnum, udev->bus->controller->driver->name);
2989 /* cope with hardware quirkiness:
2990 * - let SET_ADDRESS settle, some device hardware wants it
2991 * - read ep0 maxpacket even for high and low speed,
2994 if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3))
2998 retval = usb_get_device_descriptor(udev, 8);
3001 "device descriptor read/8, error %d\n",
3013 if (udev->descriptor.bMaxPacketSize0 == 0xff ||
3014 udev->speed == USB_SPEED_SUPER)
3017 i = udev->descriptor.bMaxPacketSize0;
3018 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
3019 if (udev->speed == USB_SPEED_LOW ||
3020 !(i == 8 || i == 16 || i == 32 || i == 64)) {
3021 dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
3025 if (udev->speed == USB_SPEED_FULL)
3026 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
3028 dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
3029 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
3030 usb_ep0_reinit(udev);
3033 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
3034 if (retval < (signed)sizeof(udev->descriptor)) {
3035 dev_err(&udev->dev, "device descriptor read/all, error %d\n",
3043 /* notify HCD that we have a device connected and addressed */
3044 if (hcd->driver->update_device)
3045 hcd->driver->update_device(hcd, udev);
3048 hub_port_disable(hub, port1, 0);
3049 update_devnum(udev, devnum); /* for disconnect processing */
3051 mutex_unlock(&usb_address0_mutex);
3056 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
3058 struct usb_qualifier_descriptor *qual;
3061 qual = kmalloc (sizeof *qual, GFP_KERNEL);
3065 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
3066 qual, sizeof *qual);
3067 if (status == sizeof *qual) {
3068 dev_info(&udev->dev, "not running at top speed; "
3069 "connect to a high speed hub\n");
3070 /* hub LEDs are probably harder to miss than syslog */
3071 if (hub->has_indicators) {
3072 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
3073 schedule_delayed_work (&hub->leds, 0);
3080 hub_power_remaining (struct usb_hub *hub)
3082 struct usb_device *hdev = hub->hdev;
3086 if (!hub->limited_power)
3089 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
3090 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
3091 struct usb_device *udev = hdev->children[port1 - 1];
3097 /* Unconfigured devices may not use more than 100mA,
3098 * or 8mA for OTG ports */
3099 if (udev->actconfig)
3100 delta = udev->actconfig->desc.bMaxPower * 2;
3101 else if (port1 != udev->bus->otg_port || hdev->parent)
3105 if (delta > hub->mA_per_port)
3106 dev_warn(&udev->dev,
3107 "%dmA is over %umA budget for port %d!\n",
3108 delta, hub->mA_per_port, port1);
3111 if (remaining < 0) {
3112 dev_warn(hub->intfdev, "%dmA over power budget!\n",
3119 /* Handle physical or logical connection change events.
3120 * This routine is called when:
3121 * a port connection-change occurs;
3122 * a port enable-change occurs (often caused by EMI);
3123 * usb_reset_and_verify_device() encounters changed descriptors (as from
3124 * a firmware download)
3125 * caller already locked the hub
3127 static void hub_port_connect_change(struct usb_hub *hub, int port1,
3128 u16 portstatus, u16 portchange)
3130 struct usb_device *hdev = hub->hdev;
3131 struct device *hub_dev = hub->intfdev;
3132 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
3133 unsigned wHubCharacteristics =
3134 le16_to_cpu(hub->descriptor->wHubCharacteristics);
3135 struct usb_device *udev;
3139 "port %d, status %04x, change %04x, %s\n",
3140 port1, portstatus, portchange, portspeed(hub, portstatus));
3142 if (hub->has_indicators) {
3143 set_port_led(hub, port1, HUB_LED_AUTO);
3144 hub->indicator[port1-1] = INDICATOR_AUTO;
3147 #ifdef CONFIG_USB_OTG
3148 /* during HNP, don't repeat the debounce */
3149 if (hdev->bus->is_b_host)
3150 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
3151 USB_PORT_STAT_C_ENABLE);
3154 /* Try to resuscitate an existing device */
3155 udev = hdev->children[port1-1];
3156 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
3157 udev->state != USB_STATE_NOTATTACHED) {
3158 usb_lock_device(udev);
3159 if (portstatus & USB_PORT_STAT_ENABLE) {
3160 status = 0; /* Nothing to do */
3162 #ifdef CONFIG_USB_SUSPEND
3163 } else if (udev->state == USB_STATE_SUSPENDED &&
3164 udev->persist_enabled) {
3165 /* For a suspended device, treat this as a
3166 * remote wakeup event.
3168 status = usb_remote_wakeup(udev);
3172 status = -ENODEV; /* Don't resuscitate */
3174 usb_unlock_device(udev);
3177 clear_bit(port1, hub->change_bits);
3182 /* Disconnect any existing devices under this port */
3184 usb_disconnect(&hdev->children[port1-1]);
3185 clear_bit(port1, hub->change_bits);
3187 /* We can forget about a "removed" device when there's a physical
3188 * disconnect or the connect status changes.
3190 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
3191 (portchange & USB_PORT_STAT_C_CONNECTION))
3192 clear_bit(port1, hub->removed_bits);
3194 if (portchange & (USB_PORT_STAT_C_CONNECTION |
3195 USB_PORT_STAT_C_ENABLE)) {
3196 status = hub_port_debounce(hub, port1);
3198 if (printk_ratelimit())
3199 dev_err(hub_dev, "connect-debounce failed, "
3200 "port %d disabled\n", port1);
3201 portstatus &= ~USB_PORT_STAT_CONNECTION;
3203 portstatus = status;
3207 /* Return now if debouncing failed or nothing is connected or
3208 * the device was "removed".
3210 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
3211 test_bit(port1, hub->removed_bits)) {
3213 /* maybe switch power back on (e.g. root hub was reset) */
3214 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
3215 && !port_is_power_on(hub, portstatus))
3216 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
3218 if (portstatus & USB_PORT_STAT_ENABLE)
3223 for (i = 0; i < SET_CONFIG_TRIES; i++) {
3225 /* reallocate for each attempt, since references
3226 * to the previous one can escape in various ways
3228 udev = usb_alloc_dev(hdev, hdev->bus, port1);
3231 "couldn't allocate port %d usb_device\n",
3236 usb_set_device_state(udev, USB_STATE_POWERED);
3237 udev->bus_mA = hub->mA_per_port;
3238 udev->level = hdev->level + 1;
3239 udev->wusb = hub_is_wusb(hub);
3241 /* Only USB 3.0 devices are connected to SuperSpeed hubs. */
3242 if (hub_is_superspeed(hub->hdev))
3243 udev->speed = USB_SPEED_SUPER;
3245 udev->speed = USB_SPEED_UNKNOWN;
3247 choose_devnum(udev);
3248 if (udev->devnum <= 0) {
3249 status = -ENOTCONN; /* Don't retry */
3253 /* reset (non-USB 3.0 devices) and get descriptor */
3254 status = hub_port_init(hub, udev, port1, i);
3258 usb_detect_quirks(udev);
3259 if (udev->quirks & USB_QUIRK_DELAY_INIT)
3262 /* consecutive bus-powered hubs aren't reliable; they can
3263 * violate the voltage drop budget. if the new child has
3264 * a "powered" LED, users should notice we didn't enable it
3265 * (without reading syslog), even without per-port LEDs
3268 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
3269 && udev->bus_mA <= 100) {
3272 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
3275 dev_dbg(&udev->dev, "get status %d ?\n", status);
3278 le16_to_cpus(&devstat);
3279 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
3281 "can't connect bus-powered hub "
3283 if (hub->has_indicators) {
3284 hub->indicator[port1-1] =
3285 INDICATOR_AMBER_BLINK;
3286 schedule_delayed_work (&hub->leds, 0);
3288 status = -ENOTCONN; /* Don't retry */
3293 /* check for devices running slower than they could */
3294 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
3295 && udev->speed == USB_SPEED_FULL
3296 && highspeed_hubs != 0)
3297 check_highspeed (hub, udev, port1);
3299 /* Store the parent's children[] pointer. At this point
3300 * udev becomes globally accessible, although presumably
3301 * no one will look at it until hdev is unlocked.
3305 /* We mustn't add new devices if the parent hub has
3306 * been disconnected; we would race with the
3307 * recursively_mark_NOTATTACHED() routine.
3309 spin_lock_irq(&device_state_lock);
3310 if (hdev->state == USB_STATE_NOTATTACHED)
3313 hdev->children[port1-1] = udev;
3314 spin_unlock_irq(&device_state_lock);
3316 /* Run it through the hoops (find a driver, etc) */
3318 status = usb_new_device(udev);
3320 spin_lock_irq(&device_state_lock);
3321 hdev->children[port1-1] = NULL;
3322 spin_unlock_irq(&device_state_lock);
3329 status = hub_power_remaining(hub);
3331 dev_dbg(hub_dev, "%dmA power budget left\n", status);
3336 hub_port_disable(hub, port1, 1);
3338 usb_ep0_reinit(udev);
3339 release_devnum(udev);
3342 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
3345 if (hub->hdev->parent ||
3346 !hcd->driver->port_handed_over ||
3347 !(hcd->driver->port_handed_over)(hcd, port1))
3348 dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
3352 hub_port_disable(hub, port1, 1);
3353 if (hcd->driver->relinquish_port && !hub->hdev->parent)
3354 hcd->driver->relinquish_port(hcd, port1);
3357 static void hub_events(void)
3359 struct list_head *tmp;
3360 struct usb_device *hdev;
3361 struct usb_interface *intf;
3362 struct usb_hub *hub;
3363 struct device *hub_dev;
3372 * We restart the list every time to avoid a deadlock with
3373 * deleting hubs downstream from this one. This should be
3374 * safe since we delete the hub from the event list.
3375 * Not the most efficient, but avoids deadlocks.
3379 /* Grab the first entry at the beginning of the list */
3380 spin_lock_irq(&hub_event_lock);
3381 if (list_empty(&hub_event_list)) {
3382 spin_unlock_irq(&hub_event_lock);
3386 tmp = hub_event_list.next;
3389 hub = list_entry(tmp, struct usb_hub, event_list);
3390 kref_get(&hub->kref);
3391 spin_unlock_irq(&hub_event_lock);
3394 hub_dev = hub->intfdev;
3395 intf = to_usb_interface(hub_dev);
3396 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
3397 hdev->state, hub->descriptor
3398 ? hub->descriptor->bNbrPorts
3400 /* NOTE: expects max 15 ports... */
3401 (u16) hub->change_bits[0],
3402 (u16) hub->event_bits[0]);
3404 /* Lock the device, then check to see if we were
3405 * disconnected while waiting for the lock to succeed. */
3406 usb_lock_device(hdev);
3407 if (unlikely(hub->disconnected))
3408 goto loop_disconnected;
3410 /* If the hub has died, clean up after it */
3411 if (hdev->state == USB_STATE_NOTATTACHED) {
3412 hub->error = -ENODEV;
3413 hub_quiesce(hub, HUB_DISCONNECT);
3418 ret = usb_autopm_get_interface(intf);
3420 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
3424 /* If this is an inactive hub, do nothing */
3429 dev_dbg (hub_dev, "resetting for error %d\n",
3432 ret = usb_reset_device(hdev);
3435 "error resetting hub: %d\n", ret);
3443 /* deal with port status changes */
3444 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
3445 if (test_bit(i, hub->busy_bits))
3447 connect_change = test_bit(i, hub->change_bits);
3448 if (!test_and_clear_bit(i, hub->event_bits) &&
3452 ret = hub_port_status(hub, i,
3453 &portstatus, &portchange);
3457 if (portchange & USB_PORT_STAT_C_CONNECTION) {
3458 clear_port_feature(hdev, i,
3459 USB_PORT_FEAT_C_CONNECTION);
3463 if (portchange & USB_PORT_STAT_C_ENABLE) {
3464 if (!connect_change)
3466 "port %d enable change, "
3469 clear_port_feature(hdev, i,
3470 USB_PORT_FEAT_C_ENABLE);
3473 * EM interference sometimes causes badly
3474 * shielded USB devices to be shutdown by
3475 * the hub, this hack enables them again.
3476 * Works at least with mouse driver.
3478 if (!(portstatus & USB_PORT_STAT_ENABLE)
3480 && hdev->children[i-1]) {
3483 "disabled by hub (EMI?), "
3490 if (portchange & USB_PORT_STAT_C_SUSPEND) {
3491 struct usb_device *udev;
3493 clear_port_feature(hdev, i,
3494 USB_PORT_FEAT_C_SUSPEND);
3495 udev = hdev->children[i-1];
3497 /* TRSMRCY = 10 msec */
3500 usb_lock_device(udev);
3501 ret = usb_remote_wakeup(hdev->
3503 usb_unlock_device(udev);
3508 hub_port_disable(hub, i, 1);
3511 "resume on port %d, status %d\n",
3515 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
3519 dev_dbg(hub_dev, "over-current change on port "
3521 clear_port_feature(hdev, i,
3522 USB_PORT_FEAT_C_OVER_CURRENT);
3523 msleep(100); /* Cool down */
3524 hub_power_on(hub, true);
3525 hub_port_status(hub, i, &status, &unused);
3526 if (status & USB_PORT_STAT_OVERCURRENT)
3527 dev_err(hub_dev, "over-current "
3528 "condition on port %d\n", i);
3531 if (portchange & USB_PORT_STAT_C_RESET) {
3533 "reset change on port %d\n",
3535 clear_port_feature(hdev, i,
3536 USB_PORT_FEAT_C_RESET);
3538 if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
3539 hub_is_superspeed(hub->hdev)) {
3541 "warm reset change on port %d\n",
3543 clear_port_feature(hdev, i,
3544 USB_PORT_FEAT_C_BH_PORT_RESET);
3546 if (portchange & USB_PORT_STAT_C_LINK_STATE) {
3547 clear_port_feature(hub->hdev, i,
3548 USB_PORT_FEAT_C_PORT_LINK_STATE);
3550 if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
3552 "config error on port %d\n",
3554 clear_port_feature(hub->hdev, i,
3555 USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
3558 /* Warm reset a USB3 protocol port if it's in
3559 * SS.Inactive state.
3561 if (hub_is_superspeed(hub->hdev) &&
3562 (portstatus & USB_PORT_STAT_LINK_STATE)
3563 == USB_SS_PORT_LS_SS_INACTIVE) {
3564 dev_dbg(hub_dev, "warm reset port %d\n", i);
3565 hub_port_warm_reset(hub, i);
3569 hub_port_connect_change(hub, i,
3570 portstatus, portchange);
3573 /* deal with hub status changes */
3574 if (test_and_clear_bit(0, hub->event_bits) == 0)
3576 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
3577 dev_err (hub_dev, "get_hub_status failed\n");
3579 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
3580 dev_dbg (hub_dev, "power change\n");
3581 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
3582 if (hubstatus & HUB_STATUS_LOCAL_POWER)
3583 /* FIXME: Is this always true? */
3584 hub->limited_power = 1;
3586 hub->limited_power = 0;
3588 if (hubchange & HUB_CHANGE_OVERCURRENT) {
3592 dev_dbg(hub_dev, "over-current change\n");
3593 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
3594 msleep(500); /* Cool down */
3595 hub_power_on(hub, true);
3596 hub_hub_status(hub, &status, &unused);
3597 if (status & HUB_STATUS_OVERCURRENT)
3598 dev_err(hub_dev, "over-current "
3604 /* Balance the usb_autopm_get_interface() above */
3605 usb_autopm_put_interface_no_suspend(intf);
3607 /* Balance the usb_autopm_get_interface_no_resume() in
3608 * kick_khubd() and allow autosuspend.
3610 usb_autopm_put_interface(intf);
3612 usb_unlock_device(hdev);
3613 kref_put(&hub->kref, hub_release);
3615 } /* end while (1) */
3618 static int hub_thread(void *__unused)
3620 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3621 * port handover. Otherwise it might see that a full-speed device
3622 * was gone before the EHCI controller had handed its port over to
3623 * the companion full-speed controller.
3629 wait_event_freezable(khubd_wait,
3630 !list_empty(&hub_event_list) ||
3631 kthread_should_stop());
3632 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
3634 pr_debug("%s: khubd exiting\n", usbcore_name);
3638 static const struct usb_device_id hub_id_table[] = {
3639 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
3640 .bDeviceClass = USB_CLASS_HUB},
3641 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
3642 .bInterfaceClass = USB_CLASS_HUB},
3643 { } /* Terminating entry */
3646 MODULE_DEVICE_TABLE (usb, hub_id_table);
3648 static struct usb_driver hub_driver = {
3651 .disconnect = hub_disconnect,
3652 .suspend = hub_suspend,
3653 .resume = hub_resume,
3654 .reset_resume = hub_reset_resume,
3655 .pre_reset = hub_pre_reset,
3656 .post_reset = hub_post_reset,
3657 .unlocked_ioctl = hub_ioctl,
3658 .id_table = hub_id_table,
3659 .supports_autosuspend = 1,
3662 int usb_hub_init(void)
3664 if (usb_register(&hub_driver) < 0) {
3665 printk(KERN_ERR "%s: can't register hub driver\n",
3670 khubd_task = kthread_run(hub_thread, NULL, "khubd");
3671 if (!IS_ERR(khubd_task))
3674 /* Fall through if kernel_thread failed */
3675 usb_deregister(&hub_driver);
3676 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
3681 void usb_hub_cleanup(void)
3683 kthread_stop(khubd_task);
3686 * Hub resources are freed for us by usb_deregister. It calls
3687 * usb_driver_purge on every device which in turn calls that
3688 * devices disconnect function if it is using this driver.
3689 * The hub_disconnect function takes care of releasing the
3690 * individual hub resources. -greg
3692 usb_deregister(&hub_driver);
3693 } /* usb_hub_cleanup() */
3695 static int descriptors_changed(struct usb_device *udev,
3696 struct usb_device_descriptor *old_device_descriptor)
3700 unsigned serial_len = 0;
3702 unsigned old_length;
3706 if (memcmp(&udev->descriptor, old_device_descriptor,
3707 sizeof(*old_device_descriptor)) != 0)
3710 /* Since the idVendor, idProduct, and bcdDevice values in the
3711 * device descriptor haven't changed, we will assume the
3712 * Manufacturer and Product strings haven't changed either.
3713 * But the SerialNumber string could be different (e.g., a
3714 * different flash card of the same brand).
3717 serial_len = strlen(udev->serial) + 1;
3720 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3721 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3722 len = max(len, old_length);
3725 buf = kmalloc(len, GFP_NOIO);
3727 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
3728 /* assume the worst */
3731 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3732 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3733 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
3735 if (length != old_length) {
3736 dev_dbg(&udev->dev, "config index %d, error %d\n",
3741 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3743 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
3745 ((struct usb_config_descriptor *) buf)->
3746 bConfigurationValue);
3752 if (!changed && serial_len) {
3753 length = usb_string(udev, udev->descriptor.iSerialNumber,
3755 if (length + 1 != serial_len) {
3756 dev_dbg(&udev->dev, "serial string error %d\n",
3759 } else if (memcmp(buf, udev->serial, length) != 0) {
3760 dev_dbg(&udev->dev, "serial string changed\n");
3770 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
3771 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3773 * WARNING - don't use this routine to reset a composite device
3774 * (one with multiple interfaces owned by separate drivers)!
3775 * Use usb_reset_device() instead.
3777 * Do a port reset, reassign the device's address, and establish its
3778 * former operating configuration. If the reset fails, or the device's
3779 * descriptors change from their values before the reset, or the original
3780 * configuration and altsettings cannot be restored, a flag will be set
3781 * telling khubd to pretend the device has been disconnected and then
3782 * re-connected. All drivers will be unbound, and the device will be
3783 * re-enumerated and probed all over again.
3785 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3786 * flagged for logical disconnection, or some other negative error code
3787 * if the reset wasn't even attempted.
3789 * The caller must own the device lock. For example, it's safe to use
3790 * this from a driver probe() routine after downloading new firmware.
3791 * For calls that might not occur during probe(), drivers should lock
3792 * the device using usb_lock_device_for_reset().
3794 * Locking exception: This routine may also be called from within an
3795 * autoresume handler. Such usage won't conflict with other tasks
3796 * holding the device lock because these tasks should always call
3797 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3799 static int usb_reset_and_verify_device(struct usb_device *udev)
3801 struct usb_device *parent_hdev = udev->parent;
3802 struct usb_hub *parent_hub;
3803 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
3804 struct usb_device_descriptor descriptor = udev->descriptor;
3806 int port1 = udev->portnum;
3808 if (udev->state == USB_STATE_NOTATTACHED ||
3809 udev->state == USB_STATE_SUSPENDED) {
3810 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3816 /* this requires hcd-specific logic; see ohci_restart() */
3817 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
3820 parent_hub = hdev_to_hub(parent_hdev);
3822 set_bit(port1, parent_hub->busy_bits);
3823 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3825 /* ep0 maxpacket size may change; let the HCD know about it.
3826 * Other endpoints will be handled by re-enumeration. */
3827 usb_ep0_reinit(udev);
3828 ret = hub_port_init(parent_hub, udev, port1, i);
3829 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
3832 clear_bit(port1, parent_hub->busy_bits);
3837 /* Device might have changed firmware (DFU or similar) */
3838 if (descriptors_changed(udev, &descriptor)) {
3839 dev_info(&udev->dev, "device firmware changed\n");
3840 udev->descriptor = descriptor; /* for disconnect() calls */
3844 /* Restore the device's previous configuration */
3845 if (!udev->actconfig)
3848 mutex_lock(hcd->bandwidth_mutex);
3849 ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
3851 dev_warn(&udev->dev,
3852 "Busted HC? Not enough HCD resources for "
3853 "old configuration.\n");
3854 mutex_unlock(hcd->bandwidth_mutex);
3857 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3858 USB_REQ_SET_CONFIGURATION, 0,
3859 udev->actconfig->desc.bConfigurationValue, 0,
3860 NULL, 0, USB_CTRL_SET_TIMEOUT);
3863 "can't restore configuration #%d (error=%d)\n",
3864 udev->actconfig->desc.bConfigurationValue, ret);
3865 mutex_unlock(hcd->bandwidth_mutex);
3868 mutex_unlock(hcd->bandwidth_mutex);
3869 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3871 /* Put interfaces back into the same altsettings as before.
3872 * Don't bother to send the Set-Interface request for interfaces
3873 * that were already in altsetting 0; besides being unnecessary,
3874 * many devices can't handle it. Instead just reset the host-side
3877 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3878 struct usb_host_config *config = udev->actconfig;
3879 struct usb_interface *intf = config->interface[i];
3880 struct usb_interface_descriptor *desc;
3882 desc = &intf->cur_altsetting->desc;
3883 if (desc->bAlternateSetting == 0) {
3884 usb_disable_interface(udev, intf, true);
3885 usb_enable_interface(udev, intf, true);
3888 /* Let the bandwidth allocation function know that this
3889 * device has been reset, and it will have to use
3890 * alternate setting 0 as the current alternate setting.
3892 intf->resetting_device = 1;
3893 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3894 desc->bAlternateSetting);
3895 intf->resetting_device = 0;
3898 dev_err(&udev->dev, "failed to restore interface %d "
3899 "altsetting %d (error=%d)\n",
3900 desc->bInterfaceNumber,
3901 desc->bAlternateSetting,
3911 hub_port_logical_disconnect(parent_hub, port1);
3916 * usb_reset_device - warn interface drivers and perform a USB port reset
3917 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3919 * Warns all drivers bound to registered interfaces (using their pre_reset
3920 * method), performs the port reset, and then lets the drivers know that
3921 * the reset is over (using their post_reset method).
3923 * Return value is the same as for usb_reset_and_verify_device().
3925 * The caller must own the device lock. For example, it's safe to use
3926 * this from a driver probe() routine after downloading new firmware.
3927 * For calls that might not occur during probe(), drivers should lock
3928 * the device using usb_lock_device_for_reset().
3930 * If an interface is currently being probed or disconnected, we assume
3931 * its driver knows how to handle resets. For all other interfaces,
3932 * if the driver doesn't have pre_reset and post_reset methods then
3933 * we attempt to unbind it and rebind afterward.
3935 int usb_reset_device(struct usb_device *udev)
3939 struct usb_host_config *config = udev->actconfig;
3941 if (udev->state == USB_STATE_NOTATTACHED ||
3942 udev->state == USB_STATE_SUSPENDED) {
3943 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3948 /* Prevent autosuspend during the reset */
3949 usb_autoresume_device(udev);
3952 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3953 struct usb_interface *cintf = config->interface[i];
3954 struct usb_driver *drv;
3957 if (cintf->dev.driver) {
3958 drv = to_usb_driver(cintf->dev.driver);
3959 if (drv->pre_reset && drv->post_reset)
3960 unbind = (drv->pre_reset)(cintf);
3961 else if (cintf->condition ==
3962 USB_INTERFACE_BOUND)
3965 usb_forced_unbind_intf(cintf);
3970 ret = usb_reset_and_verify_device(udev);
3973 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3974 struct usb_interface *cintf = config->interface[i];
3975 struct usb_driver *drv;
3976 int rebind = cintf->needs_binding;
3978 if (!rebind && cintf->dev.driver) {
3979 drv = to_usb_driver(cintf->dev.driver);
3980 if (drv->post_reset)
3981 rebind = (drv->post_reset)(cintf);
3982 else if (cintf->condition ==
3983 USB_INTERFACE_BOUND)
3986 if (ret == 0 && rebind)
3987 usb_rebind_intf(cintf);
3991 usb_autosuspend_device(udev);
3994 EXPORT_SYMBOL_GPL(usb_reset_device);
3998 * usb_queue_reset_device - Reset a USB device from an atomic context
3999 * @iface: USB interface belonging to the device to reset
4001 * This function can be used to reset a USB device from an atomic
4002 * context, where usb_reset_device() won't work (as it blocks).
4004 * Doing a reset via this method is functionally equivalent to calling
4005 * usb_reset_device(), except for the fact that it is delayed to a
4006 * workqueue. This means that any drivers bound to other interfaces
4007 * might be unbound, as well as users from usbfs in user space.
4011 * - Scheduling two resets at the same time from two different drivers
4012 * attached to two different interfaces of the same device is
4013 * possible; depending on how the driver attached to each interface
4014 * handles ->pre_reset(), the second reset might happen or not.
4016 * - If a driver is unbound and it had a pending reset, the reset will
4019 * - This function can be called during .probe() or .disconnect()
4020 * times. On return from .disconnect(), any pending resets will be
4023 * There is no no need to lock/unlock the @reset_ws as schedule_work()
4026 * NOTE: We don't do any reference count tracking because it is not
4027 * needed. The lifecycle of the work_struct is tied to the
4028 * usb_interface. Before destroying the interface we cancel the
4029 * work_struct, so the fact that work_struct is queued and or
4030 * running means the interface (and thus, the device) exist and
4033 void usb_queue_reset_device(struct usb_interface *iface)
4035 schedule_work(&iface->reset_ws);
4037 EXPORT_SYMBOL_GPL(usb_queue_reset_device);