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/kthread.h>
23 #include <linux/mutex.h>
24 #include <linux/freezer.h>
26 #include <asm/uaccess.h>
27 #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 */
48 dma_addr_t buffer_dma; /* DMA address for buffer */
50 struct usb_hub_status hub;
51 struct usb_port_status port;
52 } *status; /* buffer for status reports */
53 struct mutex status_mutex; /* for the status buffer */
55 int error; /* last reported error */
56 int nerrors; /* track consecutive errors */
58 struct list_head event_list; /* hubs w/data or errs ready */
59 unsigned long event_bits[1]; /* status change bitmask */
60 unsigned long change_bits[1]; /* ports with logical connect
62 unsigned long busy_bits[1]; /* ports being reset or
64 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
65 #error event_bits[] is too short!
68 struct usb_hub_descriptor *descriptor; /* class descriptor */
69 struct usb_tt tt; /* Transaction Translator */
71 unsigned mA_per_port; /* current for each child */
73 unsigned limited_power:1;
75 unsigned disconnected:1;
77 unsigned has_indicators:1;
78 u8 indicator[USB_MAXCHILDREN];
79 struct delayed_work leds;
83 /* Protect struct usb_device->state and ->children members
84 * Note: Both are also protected by ->dev.sem, except that ->state can
85 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
86 static DEFINE_SPINLOCK(device_state_lock);
88 /* khubd's worklist and its lock */
89 static DEFINE_SPINLOCK(hub_event_lock);
90 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
93 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
95 static struct task_struct *khubd_task;
97 /* cycle leds on hubs that aren't blinking for attention */
98 static int blinkenlights = 0;
99 module_param (blinkenlights, bool, S_IRUGO);
100 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
103 * As of 2.6.10 we introduce a new USB device initialization scheme which
104 * closely resembles the way Windows works. Hopefully it will be compatible
105 * with a wider range of devices than the old scheme. However some previously
106 * working devices may start giving rise to "device not accepting address"
107 * errors; if that happens the user can try the old scheme by adjusting the
108 * following module parameters.
110 * For maximum flexibility there are two boolean parameters to control the
111 * hub driver's behavior. On the first initialization attempt, if the
112 * "old_scheme_first" parameter is set then the old scheme will be used,
113 * otherwise the new scheme is used. If that fails and "use_both_schemes"
114 * is set, then the driver will make another attempt, using the other scheme.
116 static int old_scheme_first = 0;
117 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
118 MODULE_PARM_DESC(old_scheme_first,
119 "start with the old device initialization scheme");
121 static int use_both_schemes = 1;
122 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
123 MODULE_PARM_DESC(use_both_schemes,
124 "try the other device initialization scheme if the "
127 /* Mutual exclusion for EHCI CF initialization. This interferes with
128 * port reset on some companion controllers.
130 DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
131 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
134 static inline char *portspeed(int portstatus)
136 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
138 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
144 /* Note that hdev or one of its children must be locked! */
145 static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
147 return usb_get_intfdata(hdev->actconfig->interface[0]);
150 /* USB 2.0 spec Section 11.24.4.5 */
151 static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
155 for (i = 0; i < 3; i++) {
156 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
157 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
158 USB_DT_HUB << 8, 0, data, size,
159 USB_CTRL_GET_TIMEOUT);
160 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
167 * USB 2.0 spec Section 11.24.2.1
169 static int clear_hub_feature(struct usb_device *hdev, int feature)
171 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
172 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
176 * USB 2.0 spec Section 11.24.2.2
178 static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
180 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
181 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
186 * USB 2.0 spec Section 11.24.2.13
188 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
190 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
191 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
196 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
197 * for info about using port indicators
199 static void set_port_led(
205 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
206 USB_PORT_FEAT_INDICATOR);
208 dev_dbg (hub->intfdev,
209 "port %d indicator %s status %d\n",
211 ({ char *s; switch (selector) {
212 case HUB_LED_AMBER: s = "amber"; break;
213 case HUB_LED_GREEN: s = "green"; break;
214 case HUB_LED_OFF: s = "off"; break;
215 case HUB_LED_AUTO: s = "auto"; break;
216 default: s = "??"; break;
221 #define LED_CYCLE_PERIOD ((2*HZ)/3)
223 static void led_work (struct work_struct *work)
225 struct usb_hub *hub =
226 container_of(work, struct usb_hub, leds.work);
227 struct usb_device *hdev = hub->hdev;
229 unsigned changed = 0;
232 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
235 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
236 unsigned selector, mode;
238 /* 30%-50% duty cycle */
240 switch (hub->indicator[i]) {
242 case INDICATOR_CYCLE:
244 selector = HUB_LED_AUTO;
245 mode = INDICATOR_AUTO;
247 /* blinking green = sw attention */
248 case INDICATOR_GREEN_BLINK:
249 selector = HUB_LED_GREEN;
250 mode = INDICATOR_GREEN_BLINK_OFF;
252 case INDICATOR_GREEN_BLINK_OFF:
253 selector = HUB_LED_OFF;
254 mode = INDICATOR_GREEN_BLINK;
256 /* blinking amber = hw attention */
257 case INDICATOR_AMBER_BLINK:
258 selector = HUB_LED_AMBER;
259 mode = INDICATOR_AMBER_BLINK_OFF;
261 case INDICATOR_AMBER_BLINK_OFF:
262 selector = HUB_LED_OFF;
263 mode = INDICATOR_AMBER_BLINK;
265 /* blink green/amber = reserved */
266 case INDICATOR_ALT_BLINK:
267 selector = HUB_LED_GREEN;
268 mode = INDICATOR_ALT_BLINK_OFF;
270 case INDICATOR_ALT_BLINK_OFF:
271 selector = HUB_LED_AMBER;
272 mode = INDICATOR_ALT_BLINK;
277 if (selector != HUB_LED_AUTO)
279 set_port_led(hub, i + 1, selector);
280 hub->indicator[i] = mode;
282 if (!changed && blinkenlights) {
284 cursor %= hub->descriptor->bNbrPorts;
285 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
286 hub->indicator[cursor] = INDICATOR_CYCLE;
290 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
293 /* use a short timeout for hub/port status fetches */
294 #define USB_STS_TIMEOUT 1000
295 #define USB_STS_RETRIES 5
298 * USB 2.0 spec Section 11.24.2.6
300 static int get_hub_status(struct usb_device *hdev,
301 struct usb_hub_status *data)
303 int i, status = -ETIMEDOUT;
305 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
306 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
307 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
308 data, sizeof(*data), USB_STS_TIMEOUT);
314 * USB 2.0 spec Section 11.24.2.7
316 static int get_port_status(struct usb_device *hdev, int port1,
317 struct usb_port_status *data)
319 int i, status = -ETIMEDOUT;
321 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
322 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
323 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
324 data, sizeof(*data), USB_STS_TIMEOUT);
329 static int hub_port_status(struct usb_hub *hub, int port1,
330 u16 *status, u16 *change)
334 mutex_lock(&hub->status_mutex);
335 ret = get_port_status(hub->hdev, port1, &hub->status->port);
337 dev_err(hub->intfdev,
338 "%s failed (err = %d)\n", __func__, ret);
342 *status = le16_to_cpu(hub->status->port.wPortStatus);
343 *change = le16_to_cpu(hub->status->port.wPortChange);
346 mutex_unlock(&hub->status_mutex);
350 static void kick_khubd(struct usb_hub *hub)
354 /* Suppress autosuspend until khubd runs */
355 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
357 spin_lock_irqsave(&hub_event_lock, flags);
358 if (!hub->disconnected && list_empty(&hub->event_list)) {
359 list_add_tail(&hub->event_list, &hub_event_list);
360 wake_up(&khubd_wait);
362 spin_unlock_irqrestore(&hub_event_lock, flags);
365 void usb_kick_khubd(struct usb_device *hdev)
367 /* FIXME: What if hdev isn't bound to the hub driver? */
368 kick_khubd(hdev_to_hub(hdev));
372 /* completion function, fires on port status changes and various faults */
373 static void hub_irq(struct urb *urb)
375 struct usb_hub *hub = urb->context;
376 int status = urb->status;
381 case -ENOENT: /* synchronous unlink */
382 case -ECONNRESET: /* async unlink */
383 case -ESHUTDOWN: /* hardware going away */
386 default: /* presumably an error */
387 /* Cause a hub reset after 10 consecutive errors */
388 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
389 if ((++hub->nerrors < 10) || hub->error)
394 /* let khubd handle things */
395 case 0: /* we got data: port status changed */
397 for (i = 0; i < urb->actual_length; ++i)
398 bits |= ((unsigned long) ((*hub->buffer)[i]))
400 hub->event_bits[0] = bits;
406 /* Something happened, let khubd figure it out */
413 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
414 && status != -ENODEV && status != -EPERM)
415 dev_err (hub->intfdev, "resubmit --> %d\n", status);
418 /* USB 2.0 spec Section 11.24.2.3 */
420 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
422 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
423 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
428 * enumeration blocks khubd for a long time. we use keventd instead, since
429 * long blocking there is the exception, not the rule. accordingly, HCDs
430 * talking to TTs must queue control transfers (not just bulk and iso), so
431 * both can talk to the same hub concurrently.
433 static void hub_tt_kevent (struct work_struct *work)
435 struct usb_hub *hub =
436 container_of(work, struct usb_hub, tt.kevent);
440 spin_lock_irqsave (&hub->tt.lock, flags);
441 while (--limit && !list_empty (&hub->tt.clear_list)) {
442 struct list_head *temp;
443 struct usb_tt_clear *clear;
444 struct usb_device *hdev = hub->hdev;
447 temp = hub->tt.clear_list.next;
448 clear = list_entry (temp, struct usb_tt_clear, clear_list);
449 list_del (&clear->clear_list);
451 /* drop lock so HCD can concurrently report other TT errors */
452 spin_unlock_irqrestore (&hub->tt.lock, flags);
453 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
454 spin_lock_irqsave (&hub->tt.lock, flags);
458 "clear tt %d (%04x) error %d\n",
459 clear->tt, clear->devinfo, status);
462 spin_unlock_irqrestore (&hub->tt.lock, flags);
466 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
467 * @udev: the device whose split transaction failed
468 * @pipe: identifies the endpoint of the failed transaction
470 * High speed HCDs use this to tell the hub driver that some split control or
471 * bulk transaction failed in a way that requires clearing internal state of
472 * a transaction translator. This is normally detected (and reported) from
475 * It may not be possible for that hub to handle additional full (or low)
476 * speed transactions until that state is fully cleared out.
478 void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
480 struct usb_tt *tt = udev->tt;
482 struct usb_tt_clear *clear;
484 /* we've got to cope with an arbitrary number of pending TT clears,
485 * since each TT has "at least two" buffers that can need it (and
486 * there can be many TTs per hub). even if they're uncommon.
488 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
489 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
490 /* FIXME recover somehow ... RESET_TT? */
494 /* info that CLEAR_TT_BUFFER needs */
495 clear->tt = tt->multi ? udev->ttport : 1;
496 clear->devinfo = usb_pipeendpoint (pipe);
497 clear->devinfo |= udev->devnum << 4;
498 clear->devinfo |= usb_pipecontrol (pipe)
499 ? (USB_ENDPOINT_XFER_CONTROL << 11)
500 : (USB_ENDPOINT_XFER_BULK << 11);
501 if (usb_pipein (pipe))
502 clear->devinfo |= 1 << 15;
504 /* tell keventd to clear state for this TT */
505 spin_lock_irqsave (&tt->lock, flags);
506 list_add_tail (&clear->clear_list, &tt->clear_list);
507 schedule_work (&tt->kevent);
508 spin_unlock_irqrestore (&tt->lock, flags);
510 EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer);
512 static void hub_power_on(struct usb_hub *hub)
515 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
516 u16 wHubCharacteristics =
517 le16_to_cpu(hub->descriptor->wHubCharacteristics);
519 /* Enable power on each port. Some hubs have reserved values
520 * of LPSM (> 2) in their descriptors, even though they are
521 * USB 2.0 hubs. Some hubs do not implement port-power switching
522 * but only emulate it. In all cases, the ports won't work
523 * unless we send these messages to the hub.
525 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
526 dev_dbg(hub->intfdev, "enabling power on all ports\n");
528 dev_dbg(hub->intfdev, "trying to enable port power on "
529 "non-switchable hub\n");
530 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
531 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
533 /* Wait at least 100 msec for power to become stable */
534 msleep(max(pgood_delay, (unsigned) 100));
537 static void hub_quiesce(struct usb_hub *hub)
539 /* (nonblocking) khubd and related activity won't re-trigger */
542 /* (blocking) stop khubd and related activity */
543 usb_kill_urb(hub->urb);
544 if (hub->has_indicators)
545 cancel_delayed_work_sync(&hub->leds);
547 cancel_work_sync(&hub->tt.kevent);
550 static void hub_activate(struct usb_hub *hub)
556 status = usb_submit_urb(hub->urb, GFP_NOIO);
558 dev_err(hub->intfdev, "activate --> %d\n", status);
559 if (hub->has_indicators && blinkenlights)
560 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
562 /* scan all ports ASAP */
566 static int hub_hub_status(struct usb_hub *hub,
567 u16 *status, u16 *change)
571 mutex_lock(&hub->status_mutex);
572 ret = get_hub_status(hub->hdev, &hub->status->hub);
574 dev_err (hub->intfdev,
575 "%s failed (err = %d)\n", __func__, ret);
577 *status = le16_to_cpu(hub->status->hub.wHubStatus);
578 *change = le16_to_cpu(hub->status->hub.wHubChange);
581 mutex_unlock(&hub->status_mutex);
585 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
587 struct usb_device *hdev = hub->hdev;
590 if (hdev->children[port1-1] && set_state)
591 usb_set_device_state(hdev->children[port1-1],
592 USB_STATE_NOTATTACHED);
594 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
596 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
602 * Disable a port and mark a logical connnect-change event, so that some
603 * time later khubd will disconnect() any existing usb_device on the port
604 * and will re-enumerate if there actually is a device attached.
606 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
608 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
609 hub_port_disable(hub, port1, 1);
611 /* FIXME let caller ask to power down the port:
612 * - some devices won't enumerate without a VBUS power cycle
613 * - SRP saves power that way
614 * - ... new call, TBD ...
615 * That's easy if this hub can switch power per-port, and
616 * khubd reactivates the port later (timer, SRP, etc).
617 * Powerdown must be optional, because of reset/DFU.
620 set_bit(port1, hub->change_bits);
624 /* caller has locked the hub device */
625 static void hub_stop(struct usb_hub *hub)
627 struct usb_device *hdev = hub->hdev;
630 /* Disconnect all the children */
631 for (i = 0; i < hdev->maxchild; ++i) {
632 if (hdev->children[i])
633 usb_disconnect(&hdev->children[i]);
638 enum hub_activation_type {
639 HUB_INIT, HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME
642 static void hub_restart(struct usb_hub *hub, enum hub_activation_type type)
644 struct usb_device *hdev = hub->hdev;
647 /* Check each port and set hub->change_bits to let khubd know
648 * which ports need attention.
650 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
651 struct usb_device *udev = hdev->children[port1-1];
653 u16 portstatus, portchange;
655 portstatus = portchange = 0;
656 status = hub_port_status(hub, port1, &portstatus, &portchange);
657 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
658 dev_dbg(hub->intfdev,
659 "port %d: status %04x change %04x\n",
660 port1, portstatus, portchange);
662 /* After anything other than HUB_RESUME (i.e., initialization
663 * or any sort of reset), every port should be disabled.
664 * Unconnected ports should likewise be disabled (paranoia),
665 * and so should ports for which we have no usb_device.
667 if ((portstatus & USB_PORT_STAT_ENABLE) && (
668 type != HUB_RESUME ||
669 !(portstatus & USB_PORT_STAT_CONNECTION) ||
671 udev->state == USB_STATE_NOTATTACHED)) {
672 clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
673 portstatus &= ~USB_PORT_STAT_ENABLE;
676 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
677 /* Tell khubd to disconnect the device or
678 * check for a new connection
680 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
681 set_bit(port1, hub->change_bits);
683 } else if (portstatus & USB_PORT_STAT_ENABLE) {
684 /* The power session apparently survived the resume.
685 * If there was an overcurrent or suspend change
686 * (i.e., remote wakeup request), have khubd
690 set_bit(port1, hub->change_bits);
692 } else if (udev->persist_enabled) {
694 udev->reset_resume = 1;
696 set_bit(port1, hub->change_bits);
699 /* The power session is gone; tell khubd */
700 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
701 set_bit(port1, hub->change_bits);
708 /* caller has locked the hub device */
709 static int hub_pre_reset(struct usb_interface *intf)
711 struct usb_hub *hub = usb_get_intfdata(intf);
717 /* caller has locked the hub device */
718 static int hub_post_reset(struct usb_interface *intf)
720 struct usb_hub *hub = usb_get_intfdata(intf);
723 hub_restart(hub, HUB_POST_RESET);
727 static int hub_configure(struct usb_hub *hub,
728 struct usb_endpoint_descriptor *endpoint)
730 struct usb_device *hdev = hub->hdev;
731 struct device *hub_dev = hub->intfdev;
732 u16 hubstatus, hubchange;
733 u16 wHubCharacteristics;
738 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
741 message = "can't allocate hub irq buffer";
746 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
748 message = "can't kmalloc hub status buffer";
752 mutex_init(&hub->status_mutex);
754 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
755 if (!hub->descriptor) {
756 message = "can't kmalloc hub descriptor";
761 /* Request the entire hub descriptor.
762 * hub->descriptor can handle USB_MAXCHILDREN ports,
763 * but the hub can/will return fewer bytes here.
765 ret = get_hub_descriptor(hdev, hub->descriptor,
766 sizeof(*hub->descriptor));
768 message = "can't read hub descriptor";
770 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
771 message = "hub has too many ports!";
776 hdev->maxchild = hub->descriptor->bNbrPorts;
777 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
778 (hdev->maxchild == 1) ? "" : "s");
780 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
782 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
784 char portstr [USB_MAXCHILDREN + 1];
786 for (i = 0; i < hdev->maxchild; i++)
787 portstr[i] = hub->descriptor->DeviceRemovable
788 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
790 portstr[hdev->maxchild] = 0;
791 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
793 dev_dbg(hub_dev, "standalone hub\n");
795 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
797 dev_dbg(hub_dev, "ganged power switching\n");
800 dev_dbg(hub_dev, "individual port power switching\n");
804 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
808 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
810 dev_dbg(hub_dev, "global over-current protection\n");
813 dev_dbg(hub_dev, "individual port over-current protection\n");
817 dev_dbg(hub_dev, "no over-current protection\n");
821 spin_lock_init (&hub->tt.lock);
822 INIT_LIST_HEAD (&hub->tt.clear_list);
823 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
824 switch (hdev->descriptor.bDeviceProtocol) {
828 dev_dbg(hub_dev, "Single TT\n");
832 ret = usb_set_interface(hdev, 0, 1);
834 dev_dbg(hub_dev, "TT per port\n");
837 dev_err(hub_dev, "Using single TT (err %d)\n",
842 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
843 hdev->descriptor.bDeviceProtocol);
847 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
848 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
849 case HUB_TTTT_8_BITS:
850 if (hdev->descriptor.bDeviceProtocol != 0) {
851 hub->tt.think_time = 666;
852 dev_dbg(hub_dev, "TT requires at most %d "
853 "FS bit times (%d ns)\n",
854 8, hub->tt.think_time);
857 case HUB_TTTT_16_BITS:
858 hub->tt.think_time = 666 * 2;
859 dev_dbg(hub_dev, "TT requires at most %d "
860 "FS bit times (%d ns)\n",
861 16, hub->tt.think_time);
863 case HUB_TTTT_24_BITS:
864 hub->tt.think_time = 666 * 3;
865 dev_dbg(hub_dev, "TT requires at most %d "
866 "FS bit times (%d ns)\n",
867 24, hub->tt.think_time);
869 case HUB_TTTT_32_BITS:
870 hub->tt.think_time = 666 * 4;
871 dev_dbg(hub_dev, "TT requires at most %d "
872 "FS bit times (%d ns)\n",
873 32, hub->tt.think_time);
877 /* probe() zeroes hub->indicator[] */
878 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
879 hub->has_indicators = 1;
880 dev_dbg(hub_dev, "Port indicators are supported\n");
883 dev_dbg(hub_dev, "power on to power good time: %dms\n",
884 hub->descriptor->bPwrOn2PwrGood * 2);
886 /* power budgeting mostly matters with bus-powered hubs,
887 * and battery-powered root hubs (may provide just 8 mA).
889 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
891 message = "can't get hub status";
894 le16_to_cpus(&hubstatus);
895 if (hdev == hdev->bus->root_hub) {
896 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
897 hub->mA_per_port = 500;
899 hub->mA_per_port = hdev->bus_mA;
900 hub->limited_power = 1;
902 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
903 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
904 hub->descriptor->bHubContrCurrent);
905 hub->limited_power = 1;
906 if (hdev->maxchild > 0) {
907 int remaining = hdev->bus_mA -
908 hub->descriptor->bHubContrCurrent;
910 if (remaining < hdev->maxchild * 100)
912 "insufficient power available "
913 "to use all downstream ports\n");
914 hub->mA_per_port = 100; /* 7.2.1.1 */
916 } else { /* Self-powered external hub */
917 /* FIXME: What about battery-powered external hubs that
918 * provide less current per port? */
919 hub->mA_per_port = 500;
921 if (hub->mA_per_port < 500)
922 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
925 ret = hub_hub_status(hub, &hubstatus, &hubchange);
927 message = "can't get hub status";
931 /* local power status reports aren't always correct */
932 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
933 dev_dbg(hub_dev, "local power source is %s\n",
934 (hubstatus & HUB_STATUS_LOCAL_POWER)
935 ? "lost (inactive)" : "good");
937 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
938 dev_dbg(hub_dev, "%sover-current condition exists\n",
939 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
941 /* set up the interrupt endpoint
942 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
943 * bytes as USB2.0[11.12.3] says because some hubs are known
944 * to send more data (and thus cause overflow). For root hubs,
945 * maxpktsize is defined in hcd.c's fake endpoint descriptors
946 * to be big enough for at least USB_MAXCHILDREN ports. */
947 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
948 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
950 if (maxp > sizeof(*hub->buffer))
951 maxp = sizeof(*hub->buffer);
953 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
955 message = "couldn't allocate interrupt urb";
960 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
961 hub, endpoint->bInterval);
962 hub->urb->transfer_dma = hub->buffer_dma;
963 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
965 /* maybe cycle the hub leds */
966 if (hub->has_indicators && blinkenlights)
967 hub->indicator [0] = INDICATOR_CYCLE;
974 dev_err (hub_dev, "config failed, %s (err %d)\n",
976 /* hub_disconnect() frees urb and descriptor */
980 static void hub_release(struct kref *kref)
982 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
984 usb_put_intf(to_usb_interface(hub->intfdev));
988 static unsigned highspeed_hubs;
990 static void hub_disconnect(struct usb_interface *intf)
992 struct usb_hub *hub = usb_get_intfdata (intf);
994 /* Take the hub off the event list and don't let it be added again */
995 spin_lock_irq(&hub_event_lock);
996 list_del_init(&hub->event_list);
997 hub->disconnected = 1;
998 spin_unlock_irq(&hub_event_lock);
1000 /* Disconnect all children and quiesce the hub */
1004 usb_set_intfdata (intf, NULL);
1006 if (hub->hdev->speed == USB_SPEED_HIGH)
1009 usb_free_urb(hub->urb);
1010 kfree(hub->descriptor);
1012 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
1015 kref_put(&hub->kref, hub_release);
1018 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1020 struct usb_host_interface *desc;
1021 struct usb_endpoint_descriptor *endpoint;
1022 struct usb_device *hdev;
1023 struct usb_hub *hub;
1025 desc = intf->cur_altsetting;
1026 hdev = interface_to_usbdev(intf);
1028 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1030 dev_warn(&intf->dev, "ignoring external hub\n");
1035 /* Some hubs have a subclass of 1, which AFAICT according to the */
1036 /* specs is not defined, but it works */
1037 if ((desc->desc.bInterfaceSubClass != 0) &&
1038 (desc->desc.bInterfaceSubClass != 1)) {
1040 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1044 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1045 if (desc->desc.bNumEndpoints != 1)
1046 goto descriptor_error;
1048 endpoint = &desc->endpoint[0].desc;
1050 /* If it's not an interrupt in endpoint, we'd better punt! */
1051 if (!usb_endpoint_is_int_in(endpoint))
1052 goto descriptor_error;
1054 /* We found a hub */
1055 dev_info (&intf->dev, "USB hub found\n");
1057 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1059 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1063 kref_init(&hub->kref);
1064 INIT_LIST_HEAD(&hub->event_list);
1065 hub->intfdev = &intf->dev;
1067 INIT_DELAYED_WORK(&hub->leds, led_work);
1070 usb_set_intfdata (intf, hub);
1071 intf->needs_remote_wakeup = 1;
1073 if (hdev->speed == USB_SPEED_HIGH)
1076 if (hub_configure(hub, endpoint) >= 0)
1079 hub_disconnect (intf);
1084 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1086 struct usb_device *hdev = interface_to_usbdev (intf);
1088 /* assert ifno == 0 (part of hub spec) */
1090 case USBDEVFS_HUB_PORTINFO: {
1091 struct usbdevfs_hub_portinfo *info = user_data;
1094 spin_lock_irq(&device_state_lock);
1095 if (hdev->devnum <= 0)
1098 info->nports = hdev->maxchild;
1099 for (i = 0; i < info->nports; i++) {
1100 if (hdev->children[i] == NULL)
1104 hdev->children[i]->devnum;
1107 spin_unlock_irq(&device_state_lock);
1109 return info->nports + 1;
1118 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1122 for (i = 0; i < udev->maxchild; ++i) {
1123 if (udev->children[i])
1124 recursively_mark_NOTATTACHED(udev->children[i]);
1126 if (udev->state == USB_STATE_SUSPENDED) {
1127 udev->discon_suspended = 1;
1128 udev->active_duration -= jiffies;
1130 udev->state = USB_STATE_NOTATTACHED;
1134 * usb_set_device_state - change a device's current state (usbcore, hcds)
1135 * @udev: pointer to device whose state should be changed
1136 * @new_state: new state value to be stored
1138 * udev->state is _not_ fully protected by the device lock. Although
1139 * most transitions are made only while holding the lock, the state can
1140 * can change to USB_STATE_NOTATTACHED at almost any time. This
1141 * is so that devices can be marked as disconnected as soon as possible,
1142 * without having to wait for any semaphores to be released. As a result,
1143 * all changes to any device's state must be protected by the
1144 * device_state_lock spinlock.
1146 * Once a device has been added to the device tree, all changes to its state
1147 * should be made using this routine. The state should _not_ be set directly.
1149 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1150 * Otherwise udev->state is set to new_state, and if new_state is
1151 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1152 * to USB_STATE_NOTATTACHED.
1154 void usb_set_device_state(struct usb_device *udev,
1155 enum usb_device_state new_state)
1157 unsigned long flags;
1159 spin_lock_irqsave(&device_state_lock, flags);
1160 if (udev->state == USB_STATE_NOTATTACHED)
1162 else if (new_state != USB_STATE_NOTATTACHED) {
1164 /* root hub wakeup capabilities are managed out-of-band
1165 * and may involve silicon errata ... ignore them here.
1168 if (udev->state == USB_STATE_SUSPENDED
1169 || new_state == USB_STATE_SUSPENDED)
1170 ; /* No change to wakeup settings */
1171 else if (new_state == USB_STATE_CONFIGURED)
1172 device_init_wakeup(&udev->dev,
1173 (udev->actconfig->desc.bmAttributes
1174 & USB_CONFIG_ATT_WAKEUP));
1176 device_init_wakeup(&udev->dev, 0);
1178 if (udev->state == USB_STATE_SUSPENDED &&
1179 new_state != USB_STATE_SUSPENDED)
1180 udev->active_duration -= jiffies;
1181 else if (new_state == USB_STATE_SUSPENDED &&
1182 udev->state != USB_STATE_SUSPENDED)
1183 udev->active_duration += jiffies;
1184 udev->state = new_state;
1186 recursively_mark_NOTATTACHED(udev);
1187 spin_unlock_irqrestore(&device_state_lock, flags);
1191 * WUSB devices are simple: they have no hubs behind, so the mapping
1192 * device <-> virtual port number becomes 1:1. Why? to simplify the
1193 * life of the device connection logic in
1194 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1195 * handshake we need to assign a temporary address in the unauthorized
1196 * space. For simplicity we use the first virtual port number found to
1197 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1198 * and that becomes it's address [X < 128] or its unauthorized address
1201 * We add 1 as an offset to the one-based USB-stack port number
1202 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1203 * 0 is reserved by USB for default address; (b) Linux's USB stack
1204 * uses always #1 for the root hub of the controller. So USB stack's
1205 * port #1, which is wusb virtual-port #0 has address #2.
1207 static void choose_address(struct usb_device *udev)
1210 struct usb_bus *bus = udev->bus;
1212 /* If khubd ever becomes multithreaded, this will need a lock */
1214 devnum = udev->portnum + 1;
1215 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1217 /* Try to allocate the next devnum beginning at
1218 * bus->devnum_next. */
1219 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1222 devnum = find_next_zero_bit(bus->devmap.devicemap,
1224 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1227 set_bit(devnum, bus->devmap.devicemap);
1228 udev->devnum = devnum;
1232 static void release_address(struct usb_device *udev)
1234 if (udev->devnum > 0) {
1235 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1240 static void update_address(struct usb_device *udev, int devnum)
1242 /* The address for a WUSB device is managed by wusbcore. */
1244 udev->devnum = devnum;
1247 #ifdef CONFIG_USB_SUSPEND
1249 static void usb_stop_pm(struct usb_device *udev)
1251 /* Synchronize with the ksuspend thread to prevent any more
1252 * autosuspend requests from being submitted, and decrement
1253 * the parent's count of unsuspended children.
1256 if (udev->parent && !udev->discon_suspended)
1257 usb_autosuspend_device(udev->parent);
1258 usb_pm_unlock(udev);
1260 /* Stop any autosuspend requests already submitted */
1261 cancel_rearming_delayed_work(&udev->autosuspend);
1266 static inline void usb_stop_pm(struct usb_device *udev)
1272 * usb_disconnect - disconnect a device (usbcore-internal)
1273 * @pdev: pointer to device being disconnected
1274 * Context: !in_interrupt ()
1276 * Something got disconnected. Get rid of it and all of its children.
1278 * If *pdev is a normal device then the parent hub must already be locked.
1279 * If *pdev is a root hub then this routine will acquire the
1280 * usb_bus_list_lock on behalf of the caller.
1282 * Only hub drivers (including virtual root hub drivers for host
1283 * controllers) should ever call this.
1285 * This call is synchronous, and may not be used in an interrupt context.
1287 void usb_disconnect(struct usb_device **pdev)
1289 struct usb_device *udev = *pdev;
1293 pr_debug ("%s nodev\n", __func__);
1297 /* mark the device as inactive, so any further urb submissions for
1298 * this device (and any of its children) will fail immediately.
1299 * this quiesces everyting except pending urbs.
1301 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1302 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1304 usb_lock_device(udev);
1306 /* Free up all the children before we remove this device */
1307 for (i = 0; i < USB_MAXCHILDREN; i++) {
1308 if (udev->children[i])
1309 usb_disconnect(&udev->children[i]);
1312 /* deallocate hcd/hardware state ... nuking all pending urbs and
1313 * cleaning up all state associated with the current configuration
1314 * so that the hardware is now fully quiesced.
1316 dev_dbg (&udev->dev, "unregistering device\n");
1317 usb_disable_device(udev, 0);
1319 usb_unlock_device(udev);
1321 /* Remove the device-specific files from sysfs. This must be
1322 * done with udev unlocked, because some of the attribute
1323 * routines try to acquire the device lock.
1325 usb_remove_sysfs_dev_files(udev);
1327 /* Unregister the device. The device driver is responsible
1328 * for removing the device files from usbfs and sysfs and for
1329 * de-configuring the device.
1331 device_del(&udev->dev);
1333 /* Free the device number and delete the parent's children[]
1334 * (or root_hub) pointer.
1336 release_address(udev);
1338 /* Avoid races with recursively_mark_NOTATTACHED() */
1339 spin_lock_irq(&device_state_lock);
1341 spin_unlock_irq(&device_state_lock);
1345 put_device(&udev->dev);
1348 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1349 static void show_string(struct usb_device *udev, char *id, char *string)
1353 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1356 static void announce_device(struct usb_device *udev)
1358 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1359 le16_to_cpu(udev->descriptor.idVendor),
1360 le16_to_cpu(udev->descriptor.idProduct));
1361 dev_info(&udev->dev, "New USB device strings: Mfr=%d, Product=%d, "
1362 "SerialNumber=%d\n",
1363 udev->descriptor.iManufacturer,
1364 udev->descriptor.iProduct,
1365 udev->descriptor.iSerialNumber);
1366 show_string(udev, "Product", udev->product);
1367 show_string(udev, "Manufacturer", udev->manufacturer);
1368 show_string(udev, "SerialNumber", udev->serial);
1371 static inline void announce_device(struct usb_device *udev) { }
1374 #ifdef CONFIG_USB_OTG
1375 #include "otg_whitelist.h"
1379 * usb_configure_device_otg - FIXME (usbcore-internal)
1380 * @udev: newly addressed device (in ADDRESS state)
1382 * Do configuration for On-The-Go devices
1384 static int usb_configure_device_otg(struct usb_device *udev)
1388 #ifdef CONFIG_USB_OTG
1390 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1391 * to wake us after we've powered off VBUS; and HNP, switching roles
1392 * "host" to "peripheral". The OTG descriptor helps figure this out.
1394 if (!udev->bus->is_b_host
1396 && udev->parent == udev->bus->root_hub) {
1397 struct usb_otg_descriptor *desc = 0;
1398 struct usb_bus *bus = udev->bus;
1400 /* descriptor may appear anywhere in config */
1401 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1402 le16_to_cpu(udev->config[0].desc.wTotalLength),
1403 USB_DT_OTG, (void **) &desc) == 0) {
1404 if (desc->bmAttributes & USB_OTG_HNP) {
1405 unsigned port1 = udev->portnum;
1407 dev_info(&udev->dev,
1408 "Dual-Role OTG device on %sHNP port\n",
1409 (port1 == bus->otg_port)
1412 /* enable HNP before suspend, it's simpler */
1413 if (port1 == bus->otg_port)
1414 bus->b_hnp_enable = 1;
1415 err = usb_control_msg(udev,
1416 usb_sndctrlpipe(udev, 0),
1417 USB_REQ_SET_FEATURE, 0,
1419 ? USB_DEVICE_B_HNP_ENABLE
1420 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1421 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1423 /* OTG MESSAGE: report errors here,
1424 * customize to match your product.
1426 dev_info(&udev->dev,
1427 "can't set HNP mode; %d\n",
1429 bus->b_hnp_enable = 0;
1435 if (!is_targeted(udev)) {
1437 /* Maybe it can talk to us, though we can't talk to it.
1438 * (Includes HNP test device.)
1440 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
1441 err = usb_port_suspend(udev);
1443 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1455 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1456 * @udev: newly addressed device (in ADDRESS state)
1458 * This is only called by usb_new_device() and usb_authorize_device()
1459 * and FIXME -- all comments that apply to them apply here wrt to
1462 * If the device is WUSB and not authorized, we don't attempt to read
1463 * the string descriptors, as they will be errored out by the device
1464 * until it has been authorized.
1466 static int usb_configure_device(struct usb_device *udev)
1470 if (udev->config == NULL) {
1471 err = usb_get_configuration(udev);
1473 dev_err(&udev->dev, "can't read configurations, error %d\n",
1478 if (udev->wusb == 1 && udev->authorized == 0) {
1479 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1480 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1481 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1484 /* read the standard strings and cache them if present */
1485 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1486 udev->manufacturer = usb_cache_string(udev,
1487 udev->descriptor.iManufacturer);
1488 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1490 err = usb_configure_device_otg(udev);
1497 * usb_new_device - perform initial device setup (usbcore-internal)
1498 * @udev: newly addressed device (in ADDRESS state)
1500 * This is called with devices which have been enumerated, but not yet
1501 * configured. The device descriptor is available, but not descriptors
1502 * for any device configuration. The caller must have locked either
1503 * the parent hub (if udev is a normal device) or else the
1504 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1505 * udev has already been installed, but udev is not yet visible through
1506 * sysfs or other filesystem code.
1508 * It will return if the device is configured properly or not. Zero if
1509 * the interface was registered with the driver core; else a negative
1512 * This call is synchronous, and may not be used in an interrupt context.
1514 * Only the hub driver or root-hub registrar should ever call this.
1516 int usb_new_device(struct usb_device *udev)
1520 usb_detect_quirks(udev); /* Determine quirks */
1521 err = usb_configure_device(udev); /* detect & probe dev/intfs */
1524 /* export the usbdev device-node for libusb */
1525 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1526 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1528 /* Increment the parent's count of unsuspended children */
1530 usb_autoresume_device(udev->parent);
1532 /* Register the device. The device driver is responsible
1533 * for adding the device files to sysfs and for configuring
1536 err = device_add(&udev->dev);
1538 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1542 /* put device-specific files into sysfs */
1543 usb_create_sysfs_dev_files(udev);
1545 /* Tell the world! */
1546 announce_device(udev);
1550 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1556 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1557 * @usb_dev: USB device
1559 * Move the USB device to a very basic state where interfaces are disabled
1560 * and the device is in fact unconfigured and unusable.
1562 * We share a lock (that we have) with device_del(), so we need to
1565 int usb_deauthorize_device(struct usb_device *usb_dev)
1568 usb_lock_device(usb_dev);
1569 if (usb_dev->authorized == 0)
1570 goto out_unauthorized;
1571 usb_dev->authorized = 0;
1572 usb_set_configuration(usb_dev, -1);
1573 usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1574 usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1575 usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1576 kfree(usb_dev->config);
1577 usb_dev->config = NULL;
1578 for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++)
1579 kfree(usb_dev->rawdescriptors[cnt]);
1580 usb_dev->descriptor.bNumConfigurations = 0;
1581 kfree(usb_dev->rawdescriptors);
1583 usb_unlock_device(usb_dev);
1588 int usb_authorize_device(struct usb_device *usb_dev)
1591 usb_lock_device(usb_dev);
1592 if (usb_dev->authorized == 1)
1593 goto out_authorized;
1594 kfree(usb_dev->product);
1595 usb_dev->product = NULL;
1596 kfree(usb_dev->manufacturer);
1597 usb_dev->manufacturer = NULL;
1598 kfree(usb_dev->serial);
1599 usb_dev->serial = NULL;
1600 result = usb_autoresume_device(usb_dev);
1602 dev_err(&usb_dev->dev,
1603 "can't autoresume for authorization: %d\n", result);
1604 goto error_autoresume;
1606 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
1608 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
1609 "authorization: %d\n", result);
1610 goto error_device_descriptor;
1612 usb_dev->authorized = 1;
1613 result = usb_configure_device(usb_dev);
1615 goto error_configure;
1616 /* Choose and set the configuration. This registers the interfaces
1617 * with the driver core and lets interface drivers bind to them.
1619 c = usb_choose_configuration(usb_dev);
1621 result = usb_set_configuration(usb_dev, c);
1623 dev_err(&usb_dev->dev,
1624 "can't set config #%d, error %d\n", c, result);
1625 /* This need not be fatal. The user can try to
1626 * set other configurations. */
1629 dev_info(&usb_dev->dev, "authorized to connect\n");
1631 error_device_descriptor:
1634 usb_unlock_device(usb_dev); // complements locktree
1639 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1640 static unsigned hub_is_wusb(struct usb_hub *hub)
1642 struct usb_hcd *hcd;
1643 if (hub->hdev->parent != NULL) /* not a root hub? */
1645 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1646 return hcd->wireless;
1650 #define PORT_RESET_TRIES 5
1651 #define SET_ADDRESS_TRIES 2
1652 #define GET_DESCRIPTOR_TRIES 2
1653 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1654 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1656 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1657 #define HUB_SHORT_RESET_TIME 10
1658 #define HUB_LONG_RESET_TIME 200
1659 #define HUB_RESET_TIMEOUT 500
1661 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1662 struct usb_device *udev, unsigned int delay)
1664 int delay_time, ret;
1668 for (delay_time = 0;
1669 delay_time < HUB_RESET_TIMEOUT;
1670 delay_time += delay) {
1671 /* wait to give the device a chance to reset */
1674 /* read and decode port status */
1675 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1679 /* Device went away? */
1680 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1683 /* bomb out completely if the connection bounced */
1684 if ((portchange & USB_PORT_STAT_C_CONNECTION))
1687 /* if we`ve finished resetting, then break out of the loop */
1688 if (!(portstatus & USB_PORT_STAT_RESET) &&
1689 (portstatus & USB_PORT_STAT_ENABLE)) {
1690 if (hub_is_wusb(hub))
1691 udev->speed = USB_SPEED_VARIABLE;
1692 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1693 udev->speed = USB_SPEED_HIGH;
1694 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1695 udev->speed = USB_SPEED_LOW;
1697 udev->speed = USB_SPEED_FULL;
1701 /* switch to the long delay after two short delay failures */
1702 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1703 delay = HUB_LONG_RESET_TIME;
1705 dev_dbg (hub->intfdev,
1706 "port %d not reset yet, waiting %dms\n",
1713 static int hub_port_reset(struct usb_hub *hub, int port1,
1714 struct usb_device *udev, unsigned int delay)
1718 /* Block EHCI CF initialization during the port reset.
1719 * Some companion controllers don't like it when they mix.
1721 down_read(&ehci_cf_port_reset_rwsem);
1723 /* Reset the port */
1724 for (i = 0; i < PORT_RESET_TRIES; i++) {
1725 status = set_port_feature(hub->hdev,
1726 port1, USB_PORT_FEAT_RESET);
1728 dev_err(hub->intfdev,
1729 "cannot reset port %d (err = %d)\n",
1732 status = hub_port_wait_reset(hub, port1, udev, delay);
1733 if (status && status != -ENOTCONN)
1734 dev_dbg(hub->intfdev,
1735 "port_wait_reset: err = %d\n",
1739 /* return on disconnect or reset */
1742 /* TRSTRCY = 10 ms; plus some extra */
1744 update_address(udev, 0);
1748 clear_port_feature(hub->hdev,
1749 port1, USB_PORT_FEAT_C_RESET);
1750 /* FIXME need disconnect() for NOTATTACHED device */
1751 usb_set_device_state(udev, status
1752 ? USB_STATE_NOTATTACHED
1753 : USB_STATE_DEFAULT);
1757 dev_dbg (hub->intfdev,
1758 "port %d not enabled, trying reset again...\n",
1760 delay = HUB_LONG_RESET_TIME;
1763 dev_err (hub->intfdev,
1764 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1768 up_read(&ehci_cf_port_reset_rwsem);
1774 #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
1775 USB_PORT_STAT_SUSPEND)
1776 #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
1778 /* Determine whether the device on a port is ready for a normal resume,
1779 * is ready for a reset-resume, or should be disconnected.
1781 static int check_port_resume_type(struct usb_device *udev,
1782 struct usb_hub *hub, int port1,
1783 int status, unsigned portchange, unsigned portstatus)
1785 /* Is the device still present? */
1786 if (status || (portstatus & MASK_BITS) != WANT_BITS) {
1791 /* Can't do a normal resume if the port isn't enabled */
1792 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume)
1796 dev_dbg(hub->intfdev,
1797 "port %d status %04x.%04x after resume, %d\n",
1798 port1, portchange, portstatus, status);
1799 } else if (udev->reset_resume) {
1801 /* Late port handoff can set status-change bits */
1802 if (portchange & USB_PORT_STAT_C_CONNECTION)
1803 clear_port_feature(hub->hdev, port1,
1804 USB_PORT_FEAT_C_CONNECTION);
1805 if (portchange & USB_PORT_STAT_C_ENABLE)
1806 clear_port_feature(hub->hdev, port1,
1807 USB_PORT_FEAT_C_ENABLE);
1813 #ifdef CONFIG_USB_SUSPEND
1816 * usb_port_suspend - suspend a usb device's upstream port
1817 * @udev: device that's no longer in active use, not a root hub
1818 * Context: must be able to sleep; device not locked; pm locks held
1820 * Suspends a USB device that isn't in active use, conserving power.
1821 * Devices may wake out of a suspend, if anything important happens,
1822 * using the remote wakeup mechanism. They may also be taken out of
1823 * suspend by the host, using usb_port_resume(). It's also routine
1824 * to disconnect devices while they are suspended.
1826 * This only affects the USB hardware for a device; its interfaces
1827 * (and, for hubs, child devices) must already have been suspended.
1829 * Selective port suspend reduces power; most suspended devices draw
1830 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1831 * All devices below the suspended port are also suspended.
1833 * Devices leave suspend state when the host wakes them up. Some devices
1834 * also support "remote wakeup", where the device can activate the USB
1835 * tree above them to deliver data, such as a keypress or packet. In
1836 * some cases, this wakes the USB host.
1838 * Suspending OTG devices may trigger HNP, if that's been enabled
1839 * between a pair of dual-role devices. That will change roles, such
1840 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1842 * Devices on USB hub ports have only one "suspend" state, corresponding
1843 * to ACPI D2, "may cause the device to lose some context".
1844 * State transitions include:
1846 * - suspend, resume ... when the VBUS power link stays live
1847 * - suspend, disconnect ... VBUS lost
1849 * Once VBUS drop breaks the circuit, the port it's using has to go through
1850 * normal re-enumeration procedures, starting with enabling VBUS power.
1851 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1852 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1853 * timer, no SRP, no requests through sysfs.
1855 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1856 * the root hub for their bus goes into global suspend ... so we don't
1857 * (falsely) update the device power state to say it suspended.
1859 * Returns 0 on success, else negative errno.
1861 int usb_port_suspend(struct usb_device *udev)
1863 struct usb_hub *hub = hdev_to_hub(udev->parent);
1864 int port1 = udev->portnum;
1867 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1869 /* enable remote wakeup when appropriate; this lets the device
1870 * wake up the upstream hub (including maybe the root hub).
1872 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1873 * we don't explicitly enable it here.
1875 if (udev->do_remote_wakeup) {
1876 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1877 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1878 USB_DEVICE_REMOTE_WAKEUP, 0,
1880 USB_CTRL_SET_TIMEOUT);
1882 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
1887 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1889 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
1891 /* paranoia: "should not happen" */
1892 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1893 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1894 USB_DEVICE_REMOTE_WAKEUP, 0,
1896 USB_CTRL_SET_TIMEOUT);
1898 /* device has up to 10 msec to fully suspend */
1899 dev_dbg(&udev->dev, "usb %ssuspend\n",
1900 udev->auto_pm ? "auto-" : "");
1901 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1908 * If the USB "suspend" state is in use (rather than "global suspend"),
1909 * many devices will be individually taken out of suspend state using
1910 * special "resume" signaling. This routine kicks in shortly after
1911 * hardware resume signaling is finished, either because of selective
1912 * resume (by host) or remote wakeup (by device) ... now see what changed
1913 * in the tree that's rooted at this device.
1915 * If @udev->reset_resume is set then the device is reset before the
1916 * status check is done.
1918 static int finish_port_resume(struct usb_device *udev)
1923 /* caller owns the udev device lock */
1924 dev_dbg(&udev->dev, "finish %sresume\n",
1925 udev->reset_resume ? "reset-" : "");
1927 /* usb ch9 identifies four variants of SUSPENDED, based on what
1928 * state the device resumes to. Linux currently won't see the
1929 * first two on the host side; they'd be inside hub_port_init()
1930 * during many timeouts, but khubd can't suspend until later.
1932 usb_set_device_state(udev, udev->actconfig
1933 ? USB_STATE_CONFIGURED
1934 : USB_STATE_ADDRESS);
1936 /* 10.5.4.5 says not to reset a suspended port if the attached
1937 * device is enabled for remote wakeup. Hence the reset
1938 * operation is carried out here, after the port has been
1941 if (udev->reset_resume)
1942 status = usb_reset_device(udev);
1944 /* 10.5.4.5 says be sure devices in the tree are still there.
1945 * For now let's assume the device didn't go crazy on resume,
1946 * and device drivers will know about any resume quirks.
1950 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1952 status = (status > 0 ? 0 : -ENODEV);
1956 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
1958 } else if (udev->actconfig) {
1959 le16_to_cpus(&devstatus);
1960 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1961 status = usb_control_msg(udev,
1962 usb_sndctrlpipe(udev, 0),
1963 USB_REQ_CLEAR_FEATURE,
1965 USB_DEVICE_REMOTE_WAKEUP, 0,
1967 USB_CTRL_SET_TIMEOUT);
1969 dev_dbg(&udev->dev, "disable remote "
1970 "wakeup, status %d\n", status);
1978 * usb_port_resume - re-activate a suspended usb device's upstream port
1979 * @udev: device to re-activate, not a root hub
1980 * Context: must be able to sleep; device not locked; pm locks held
1982 * This will re-activate the suspended device, increasing power usage
1983 * while letting drivers communicate again with its endpoints.
1984 * USB resume explicitly guarantees that the power session between
1985 * the host and the device is the same as it was when the device
1988 * If @udev->reset_resume is set then this routine won't check that the
1989 * port is still enabled. Furthermore, finish_port_resume() above will
1990 * reset @udev. The end result is that a broken power session can be
1991 * recovered and @udev will appear to persist across a loss of VBUS power.
1993 * For example, if a host controller doesn't maintain VBUS suspend current
1994 * during a system sleep or is reset when the system wakes up, all the USB
1995 * power sessions below it will be broken. This is especially troublesome
1996 * for mass-storage devices containing mounted filesystems, since the
1997 * device will appear to have disconnected and all the memory mappings
1998 * to it will be lost. Using the USB_PERSIST facility, the device can be
1999 * made to appear as if it had not disconnected.
2001 * This facility can be dangerous. Although usb_reset_device() makes
2002 * every effort to insure that the same device is present after the
2003 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2004 * quite possible for a device to remain unaltered but its media to be
2005 * changed. If the user replaces a flash memory card while the system is
2006 * asleep, he will have only himself to blame when the filesystem on the
2007 * new card is corrupted and the system crashes.
2009 * Returns 0 on success, else negative errno.
2011 int usb_port_resume(struct usb_device *udev)
2013 struct usb_hub *hub = hdev_to_hub(udev->parent);
2014 int port1 = udev->portnum;
2016 u16 portchange, portstatus;
2018 /* Skip the initial Clear-Suspend step for a remote wakeup */
2019 status = hub_port_status(hub, port1, &portstatus, &portchange);
2020 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
2021 goto SuspendCleared;
2023 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2025 set_bit(port1, hub->busy_bits);
2027 /* see 7.1.7.7; affects power usage, but not budgeting */
2028 status = clear_port_feature(hub->hdev,
2029 port1, USB_PORT_FEAT_SUSPEND);
2031 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
2034 /* drive resume for at least 20 msec */
2035 dev_dbg(&udev->dev, "usb %sresume\n",
2036 udev->auto_pm ? "auto-" : "");
2039 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2040 * stop resume signaling. Then finish the resume
2043 status = hub_port_status(hub, port1, &portstatus, &portchange);
2045 /* TRSMRCY = 10 msec */
2051 if (portchange & USB_PORT_STAT_C_SUSPEND)
2052 clear_port_feature(hub->hdev, port1,
2053 USB_PORT_FEAT_C_SUSPEND);
2056 clear_bit(port1, hub->busy_bits);
2057 if (!hub->hdev->parent && !hub->busy_bits[0])
2058 usb_enable_root_hub_irq(hub->hdev->bus);
2060 status = check_port_resume_type(udev,
2061 hub, port1, status, portchange, portstatus);
2063 status = finish_port_resume(udev);
2065 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2066 hub_port_logical_disconnect(hub, port1);
2071 /* caller has locked udev */
2072 static int remote_wakeup(struct usb_device *udev)
2076 if (udev->state == USB_STATE_SUSPENDED) {
2077 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
2078 usb_mark_last_busy(udev);
2079 status = usb_external_resume_device(udev);
2084 #else /* CONFIG_USB_SUSPEND */
2086 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2088 int usb_port_suspend(struct usb_device *udev)
2093 /* However we may need to do a reset-resume */
2095 int usb_port_resume(struct usb_device *udev)
2097 struct usb_hub *hub = hdev_to_hub(udev->parent);
2098 int port1 = udev->portnum;
2100 u16 portchange, portstatus;
2102 status = hub_port_status(hub, port1, &portstatus, &portchange);
2103 status = check_port_resume_type(udev,
2104 hub, port1, status, portchange, portstatus);
2107 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
2108 hub_port_logical_disconnect(hub, port1);
2109 } else if (udev->reset_resume) {
2110 dev_dbg(&udev->dev, "reset-resume\n");
2111 status = usb_reset_device(udev);
2116 static inline int remote_wakeup(struct usb_device *udev)
2123 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
2125 struct usb_hub *hub = usb_get_intfdata (intf);
2126 struct usb_device *hdev = hub->hdev;
2129 /* fail if children aren't already suspended */
2130 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
2131 struct usb_device *udev;
2133 udev = hdev->children [port1-1];
2134 if (udev && udev->can_submit) {
2136 dev_dbg(&intf->dev, "port %d nyet suspended\n",
2142 dev_dbg(&intf->dev, "%s\n", __func__);
2144 /* stop khubd and related activity */
2149 static int hub_resume(struct usb_interface *intf)
2151 struct usb_hub *hub = usb_get_intfdata(intf);
2153 dev_dbg(&intf->dev, "%s\n", __func__);
2154 hub_restart(hub, HUB_RESUME);
2158 static int hub_reset_resume(struct usb_interface *intf)
2160 struct usb_hub *hub = usb_get_intfdata(intf);
2162 dev_dbg(&intf->dev, "%s\n", __func__);
2164 hub_restart(hub, HUB_RESET_RESUME);
2169 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2170 * @rhdev: struct usb_device for the root hub
2172 * The USB host controller driver calls this function when its root hub
2173 * is resumed and Vbus power has been interrupted or the controller
2174 * has been reset. The routine marks @rhdev as having lost power.
2175 * When the hub driver is resumed it will take notice and carry out
2176 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2177 * the others will be disconnected.
2179 void usb_root_hub_lost_power(struct usb_device *rhdev)
2181 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
2182 rhdev->reset_resume = 1;
2184 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
2186 #else /* CONFIG_PM */
2188 static inline int remote_wakeup(struct usb_device *udev)
2193 #define hub_suspend NULL
2194 #define hub_resume NULL
2195 #define hub_reset_resume NULL
2199 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2201 * Between connect detection and reset signaling there must be a delay
2202 * of 100ms at least for debounce and power-settling. The corresponding
2203 * timer shall restart whenever the downstream port detects a disconnect.
2205 * Apparently there are some bluetooth and irda-dongles and a number of
2206 * low-speed devices for which this debounce period may last over a second.
2207 * Not covered by the spec - but easy to deal with.
2209 * This implementation uses a 1500ms total debounce timeout; if the
2210 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2211 * every 25ms for transient disconnects. When the port status has been
2212 * unchanged for 100ms it returns the port status.
2215 #define HUB_DEBOUNCE_TIMEOUT 1500
2216 #define HUB_DEBOUNCE_STEP 25
2217 #define HUB_DEBOUNCE_STABLE 100
2219 static int hub_port_debounce(struct usb_hub *hub, int port1)
2222 int total_time, stable_time = 0;
2223 u16 portchange, portstatus;
2224 unsigned connection = 0xffff;
2226 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2227 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2231 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2232 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2233 stable_time += HUB_DEBOUNCE_STEP;
2234 if (stable_time >= HUB_DEBOUNCE_STABLE)
2238 connection = portstatus & USB_PORT_STAT_CONNECTION;
2241 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2242 clear_port_feature(hub->hdev, port1,
2243 USB_PORT_FEAT_C_CONNECTION);
2246 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2248 msleep(HUB_DEBOUNCE_STEP);
2251 dev_dbg (hub->intfdev,
2252 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2253 port1, total_time, stable_time, portstatus);
2255 if (stable_time < HUB_DEBOUNCE_STABLE)
2260 void usb_ep0_reinit(struct usb_device *udev)
2262 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2263 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
2264 usb_enable_endpoint(udev, &udev->ep0);
2266 EXPORT_SYMBOL_GPL(usb_ep0_reinit);
2268 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2269 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2271 static int hub_set_address(struct usb_device *udev, int devnum)
2277 if (udev->state == USB_STATE_ADDRESS)
2279 if (udev->state != USB_STATE_DEFAULT)
2281 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
2282 USB_REQ_SET_ADDRESS, 0, devnum, 0,
2283 NULL, 0, USB_CTRL_SET_TIMEOUT);
2285 /* Device now using proper address. */
2286 update_address(udev, devnum);
2287 usb_set_device_state(udev, USB_STATE_ADDRESS);
2288 usb_ep0_reinit(udev);
2293 /* Reset device, (re)assign address, get device descriptor.
2294 * Device connection must be stable, no more debouncing needed.
2295 * Returns device in USB_STATE_ADDRESS, except on error.
2297 * If this is called for an already-existing device (as part of
2298 * usb_reset_device), the caller must own the device lock. For a
2299 * newly detected device that is not accessible through any global
2300 * pointers, it's not necessary to lock the device.
2303 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2306 static DEFINE_MUTEX(usb_address0_mutex);
2308 struct usb_device *hdev = hub->hdev;
2310 unsigned delay = HUB_SHORT_RESET_TIME;
2311 enum usb_device_speed oldspeed = udev->speed;
2313 int devnum = udev->devnum;
2315 /* root hub ports have a slightly longer reset period
2316 * (from USB 2.0 spec, section 7.1.7.5)
2318 if (!hdev->parent) {
2319 delay = HUB_ROOT_RESET_TIME;
2320 if (port1 == hdev->bus->otg_port)
2321 hdev->bus->b_hnp_enable = 0;
2324 /* Some low speed devices have problems with the quick delay, so */
2325 /* be a bit pessimistic with those devices. RHbug #23670 */
2326 if (oldspeed == USB_SPEED_LOW)
2327 delay = HUB_LONG_RESET_TIME;
2329 mutex_lock(&usb_address0_mutex);
2331 /* Reset the device; full speed may morph to high speed */
2332 retval = hub_port_reset(hub, port1, udev, delay);
2333 if (retval < 0) /* error or disconnect */
2335 /* success, speed is known */
2338 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2339 dev_dbg(&udev->dev, "device reset changed speed!\n");
2342 oldspeed = udev->speed;
2344 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2345 * it's fixed size except for full speed devices.
2346 * For Wireless USB devices, ep0 max packet is always 512 (tho
2347 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2349 switch (udev->speed) {
2350 case USB_SPEED_VARIABLE: /* fixed at 512 */
2351 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2353 case USB_SPEED_HIGH: /* fixed at 64 */
2354 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2356 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2357 /* to determine the ep0 maxpacket size, try to read
2358 * the device descriptor to get bMaxPacketSize0 and
2359 * then correct our initial guess.
2361 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2363 case USB_SPEED_LOW: /* fixed at 8 */
2364 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2371 switch (udev->speed) {
2372 case USB_SPEED_LOW: speed = "low"; break;
2373 case USB_SPEED_FULL: speed = "full"; break;
2374 case USB_SPEED_HIGH: speed = "high"; break;
2375 case USB_SPEED_VARIABLE:
2379 default: speed = "?"; break;
2381 dev_info (&udev->dev,
2382 "%s %s speed %sUSB device using %s and address %d\n",
2383 (udev->config) ? "reset" : "new", speed, type,
2384 udev->bus->controller->driver->name, devnum);
2386 /* Set up TT records, if needed */
2388 udev->tt = hdev->tt;
2389 udev->ttport = hdev->ttport;
2390 } else if (udev->speed != USB_SPEED_HIGH
2391 && hdev->speed == USB_SPEED_HIGH) {
2392 udev->tt = &hub->tt;
2393 udev->ttport = port1;
2396 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2397 * Because device hardware and firmware is sometimes buggy in
2398 * this area, and this is how Linux has done it for ages.
2399 * Change it cautiously.
2401 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2402 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2403 * so it may help with some non-standards-compliant devices.
2404 * Otherwise we start with SET_ADDRESS and then try to read the
2405 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2408 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2409 if (USE_NEW_SCHEME(retry_counter)) {
2410 struct usb_device_descriptor *buf;
2413 #define GET_DESCRIPTOR_BUFSIZE 64
2414 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2420 /* Retry on all errors; some devices are flakey.
2421 * 255 is for WUSB devices, we actually need to use
2422 * 512 (WUSB1.0[4.8.1]).
2424 for (j = 0; j < 3; ++j) {
2425 buf->bMaxPacketSize0 = 0;
2426 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2427 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2428 USB_DT_DEVICE << 8, 0,
2429 buf, GET_DESCRIPTOR_BUFSIZE,
2430 USB_CTRL_GET_TIMEOUT);
2431 switch (buf->bMaxPacketSize0) {
2432 case 8: case 16: case 32: case 64: case 255:
2433 if (buf->bDescriptorType ==
2447 udev->descriptor.bMaxPacketSize0 =
2448 buf->bMaxPacketSize0;
2451 retval = hub_port_reset(hub, port1, udev, delay);
2452 if (retval < 0) /* error or disconnect */
2454 if (oldspeed != udev->speed) {
2456 "device reset changed speed!\n");
2461 dev_err(&udev->dev, "device descriptor "
2462 "read/%s, error %d\n",
2467 #undef GET_DESCRIPTOR_BUFSIZE
2471 * If device is WUSB, we already assigned an
2472 * unauthorized address in the Connect Ack sequence;
2473 * authorization will assign the final address.
2475 if (udev->wusb == 0) {
2476 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
2477 retval = hub_set_address(udev, devnum);
2484 "device not accepting address %d, error %d\n",
2489 /* cope with hardware quirkiness:
2490 * - let SET_ADDRESS settle, some device hardware wants it
2491 * - read ep0 maxpacket even for high and low speed,
2494 if (USE_NEW_SCHEME(retry_counter))
2498 retval = usb_get_device_descriptor(udev, 8);
2500 dev_err(&udev->dev, "device descriptor "
2501 "read/%s, error %d\n",
2513 i = udev->descriptor.bMaxPacketSize0 == 0xff? /* wusb device? */
2514 512 : udev->descriptor.bMaxPacketSize0;
2515 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2516 if (udev->speed != USB_SPEED_FULL ||
2517 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2518 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2522 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2523 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2524 usb_ep0_reinit(udev);
2527 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2528 if (retval < (signed)sizeof(udev->descriptor)) {
2529 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2540 hub_port_disable(hub, port1, 0);
2541 update_address(udev, devnum); /* for disconnect processing */
2543 mutex_unlock(&usb_address0_mutex);
2548 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2550 struct usb_qualifier_descriptor *qual;
2553 qual = kmalloc (sizeof *qual, GFP_KERNEL);
2557 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2558 qual, sizeof *qual);
2559 if (status == sizeof *qual) {
2560 dev_info(&udev->dev, "not running at top speed; "
2561 "connect to a high speed hub\n");
2562 /* hub LEDs are probably harder to miss than syslog */
2563 if (hub->has_indicators) {
2564 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
2565 schedule_delayed_work (&hub->leds, 0);
2572 hub_power_remaining (struct usb_hub *hub)
2574 struct usb_device *hdev = hub->hdev;
2578 if (!hub->limited_power)
2581 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2582 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2583 struct usb_device *udev = hdev->children[port1 - 1];
2589 /* Unconfigured devices may not use more than 100mA,
2590 * or 8mA for OTG ports */
2591 if (udev->actconfig)
2592 delta = udev->actconfig->desc.bMaxPower * 2;
2593 else if (port1 != udev->bus->otg_port || hdev->parent)
2597 if (delta > hub->mA_per_port)
2598 dev_warn(&udev->dev, "%dmA is over %umA budget "
2600 delta, hub->mA_per_port, port1);
2603 if (remaining < 0) {
2604 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2611 /* Handle physical or logical connection change events.
2612 * This routine is called when:
2613 * a port connection-change occurs;
2614 * a port enable-change occurs (often caused by EMI);
2615 * usb_reset_device() encounters changed descriptors (as from
2616 * a firmware download)
2617 * caller already locked the hub
2619 static void hub_port_connect_change(struct usb_hub *hub, int port1,
2620 u16 portstatus, u16 portchange)
2622 struct usb_device *hdev = hub->hdev;
2623 struct device *hub_dev = hub->intfdev;
2624 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
2625 unsigned wHubCharacteristics =
2626 le16_to_cpu(hub->descriptor->wHubCharacteristics);
2627 struct usb_device *udev;
2631 "port %d, status %04x, change %04x, %s\n",
2632 port1, portstatus, portchange, portspeed (portstatus));
2634 if (hub->has_indicators) {
2635 set_port_led(hub, port1, HUB_LED_AUTO);
2636 hub->indicator[port1-1] = INDICATOR_AUTO;
2639 #ifdef CONFIG_USB_OTG
2640 /* during HNP, don't repeat the debounce */
2641 if (hdev->bus->is_b_host)
2642 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
2643 USB_PORT_STAT_C_ENABLE);
2646 /* Try to use the debounce delay for protection against
2647 * port-enable changes caused, for example, by EMI.
2649 if (portchange & (USB_PORT_STAT_C_CONNECTION |
2650 USB_PORT_STAT_C_ENABLE)) {
2651 status = hub_port_debounce(hub, port1);
2653 if (printk_ratelimit())
2654 dev_err (hub_dev, "connect-debounce failed, "
2655 "port %d disabled\n", port1);
2656 portstatus &= ~USB_PORT_STAT_CONNECTION;
2658 portstatus = status;
2662 /* Try to resuscitate an existing device */
2663 udev = hdev->children[port1-1];
2664 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
2665 udev->state != USB_STATE_NOTATTACHED) {
2667 usb_lock_device(udev);
2668 if (portstatus & USB_PORT_STAT_ENABLE) {
2669 status = 0; /* Nothing to do */
2670 } else if (!udev->persist_enabled) {
2671 status = -ENODEV; /* Mustn't resuscitate */
2673 #ifdef CONFIG_USB_SUSPEND
2674 } else if (udev->state == USB_STATE_SUSPENDED) {
2675 /* For a suspended device, treat this as a
2676 * remote wakeup event.
2678 if (udev->do_remote_wakeup)
2679 status = remote_wakeup(udev);
2681 /* Otherwise leave it be; devices can't tell the
2682 * difference between suspended and disabled.
2689 status = usb_reset_composite_device(udev, NULL);
2691 usb_unlock_device(udev);
2694 clear_bit(port1, hub->change_bits);
2699 /* Disconnect any existing devices under this port */
2701 usb_disconnect(&hdev->children[port1-1]);
2702 clear_bit(port1, hub->change_bits);
2704 /* Return now if debouncing failed or nothing is connected */
2705 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2707 /* maybe switch power back on (e.g. root hub was reset) */
2708 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
2709 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2710 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2712 if (portstatus & USB_PORT_STAT_ENABLE)
2717 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2719 /* reallocate for each attempt, since references
2720 * to the previous one can escape in various ways
2722 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2725 "couldn't allocate port %d usb_device\n",
2730 usb_set_device_state(udev, USB_STATE_POWERED);
2731 udev->speed = USB_SPEED_UNKNOWN;
2732 udev->bus_mA = hub->mA_per_port;
2733 udev->level = hdev->level + 1;
2734 udev->wusb = hub_is_wusb(hub);
2736 /* set the address */
2737 choose_address(udev);
2738 if (udev->devnum <= 0) {
2739 status = -ENOTCONN; /* Don't retry */
2743 /* reset and get descriptor */
2744 status = hub_port_init(hub, udev, port1, i);
2748 /* consecutive bus-powered hubs aren't reliable; they can
2749 * violate the voltage drop budget. if the new child has
2750 * a "powered" LED, users should notice we didn't enable it
2751 * (without reading syslog), even without per-port LEDs
2754 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
2755 && udev->bus_mA <= 100) {
2758 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2761 dev_dbg(&udev->dev, "get status %d ?\n", status);
2764 le16_to_cpus(&devstat);
2765 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2767 "can't connect bus-powered hub "
2769 if (hub->has_indicators) {
2770 hub->indicator[port1-1] =
2771 INDICATOR_AMBER_BLINK;
2772 schedule_delayed_work (&hub->leds, 0);
2774 status = -ENOTCONN; /* Don't retry */
2779 /* check for devices running slower than they could */
2780 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2781 && udev->speed == USB_SPEED_FULL
2782 && highspeed_hubs != 0)
2783 check_highspeed (hub, udev, port1);
2785 /* Store the parent's children[] pointer. At this point
2786 * udev becomes globally accessible, although presumably
2787 * no one will look at it until hdev is unlocked.
2791 /* We mustn't add new devices if the parent hub has
2792 * been disconnected; we would race with the
2793 * recursively_mark_NOTATTACHED() routine.
2795 spin_lock_irq(&device_state_lock);
2796 if (hdev->state == USB_STATE_NOTATTACHED)
2799 hdev->children[port1-1] = udev;
2800 spin_unlock_irq(&device_state_lock);
2802 /* Run it through the hoops (find a driver, etc) */
2804 status = usb_new_device(udev);
2806 spin_lock_irq(&device_state_lock);
2807 hdev->children[port1-1] = NULL;
2808 spin_unlock_irq(&device_state_lock);
2815 status = hub_power_remaining(hub);
2817 dev_dbg(hub_dev, "%dmA power budget left\n", status);
2822 hub_port_disable(hub, port1, 1);
2824 usb_ep0_reinit(udev);
2825 release_address(udev);
2827 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
2830 if (hub->hdev->parent ||
2831 !hcd->driver->port_handed_over ||
2832 !(hcd->driver->port_handed_over)(hcd, port1))
2833 dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
2837 hub_port_disable(hub, port1, 1);
2838 if (hcd->driver->relinquish_port && !hub->hdev->parent)
2839 hcd->driver->relinquish_port(hcd, port1);
2842 static void hub_events(void)
2844 struct list_head *tmp;
2845 struct usb_device *hdev;
2846 struct usb_interface *intf;
2847 struct usb_hub *hub;
2848 struct device *hub_dev;
2857 * We restart the list every time to avoid a deadlock with
2858 * deleting hubs downstream from this one. This should be
2859 * safe since we delete the hub from the event list.
2860 * Not the most efficient, but avoids deadlocks.
2864 /* Grab the first entry at the beginning of the list */
2865 spin_lock_irq(&hub_event_lock);
2866 if (list_empty(&hub_event_list)) {
2867 spin_unlock_irq(&hub_event_lock);
2871 tmp = hub_event_list.next;
2874 hub = list_entry(tmp, struct usb_hub, event_list);
2875 kref_get(&hub->kref);
2876 spin_unlock_irq(&hub_event_lock);
2879 hub_dev = hub->intfdev;
2880 intf = to_usb_interface(hub_dev);
2881 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
2882 hdev->state, hub->descriptor
2883 ? hub->descriptor->bNbrPorts
2885 /* NOTE: expects max 15 ports... */
2886 (u16) hub->change_bits[0],
2887 (u16) hub->event_bits[0]);
2889 /* Lock the device, then check to see if we were
2890 * disconnected while waiting for the lock to succeed. */
2891 usb_lock_device(hdev);
2892 if (unlikely(hub->disconnected))
2895 /* If the hub has died, clean up after it */
2896 if (hdev->state == USB_STATE_NOTATTACHED) {
2897 hub->error = -ENODEV;
2903 ret = usb_autopm_get_interface(intf);
2905 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2909 /* If this is an inactive hub, do nothing */
2914 dev_dbg (hub_dev, "resetting for error %d\n",
2917 ret = usb_reset_composite_device(hdev, intf);
2920 "error resetting hub: %d\n", ret);
2928 /* deal with port status changes */
2929 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2930 if (test_bit(i, hub->busy_bits))
2932 connect_change = test_bit(i, hub->change_bits);
2933 if (!test_and_clear_bit(i, hub->event_bits) &&
2937 ret = hub_port_status(hub, i,
2938 &portstatus, &portchange);
2942 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2943 clear_port_feature(hdev, i,
2944 USB_PORT_FEAT_C_CONNECTION);
2948 if (portchange & USB_PORT_STAT_C_ENABLE) {
2949 if (!connect_change)
2951 "port %d enable change, "
2954 clear_port_feature(hdev, i,
2955 USB_PORT_FEAT_C_ENABLE);
2958 * EM interference sometimes causes badly
2959 * shielded USB devices to be shutdown by
2960 * the hub, this hack enables them again.
2961 * Works at least with mouse driver.
2963 if (!(portstatus & USB_PORT_STAT_ENABLE)
2965 && hdev->children[i-1]) {
2968 "disabled by hub (EMI?), "
2975 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2976 struct usb_device *udev;
2978 clear_port_feature(hdev, i,
2979 USB_PORT_FEAT_C_SUSPEND);
2980 udev = hdev->children[i-1];
2982 usb_lock_device(udev);
2983 ret = remote_wakeup(hdev->
2985 usb_unlock_device(udev);
2990 hub_port_disable(hub, i, 1);
2993 "resume on port %d, status %d\n",
2997 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2999 "over-current change on port %d\n",
3001 clear_port_feature(hdev, i,
3002 USB_PORT_FEAT_C_OVER_CURRENT);
3006 if (portchange & USB_PORT_STAT_C_RESET) {
3008 "reset change on port %d\n",
3010 clear_port_feature(hdev, i,
3011 USB_PORT_FEAT_C_RESET);
3015 hub_port_connect_change(hub, i,
3016 portstatus, portchange);
3019 /* deal with hub status changes */
3020 if (test_and_clear_bit(0, hub->event_bits) == 0)
3022 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
3023 dev_err (hub_dev, "get_hub_status failed\n");
3025 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
3026 dev_dbg (hub_dev, "power change\n");
3027 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
3028 if (hubstatus & HUB_STATUS_LOCAL_POWER)
3029 /* FIXME: Is this always true? */
3030 hub->limited_power = 1;
3032 hub->limited_power = 0;
3034 if (hubchange & HUB_CHANGE_OVERCURRENT) {
3035 dev_dbg (hub_dev, "overcurrent change\n");
3036 msleep(500); /* Cool down */
3037 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
3042 /* If this is a root hub, tell the HCD it's okay to
3043 * re-enable port-change interrupts now. */
3044 if (!hdev->parent && !hub->busy_bits[0])
3045 usb_enable_root_hub_irq(hdev->bus);
3048 /* Allow autosuspend if we're not going to run again */
3049 if (list_empty(&hub->event_list))
3050 usb_autopm_enable(intf);
3052 usb_unlock_device(hdev);
3053 kref_put(&hub->kref, hub_release);
3055 } /* end while (1) */
3058 static int hub_thread(void *__unused)
3060 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3061 * port handover. Otherwise it might see that a full-speed device
3062 * was gone before the EHCI controller had handed its port over to
3063 * the companion full-speed controller.
3069 wait_event_freezable(khubd_wait,
3070 !list_empty(&hub_event_list) ||
3071 kthread_should_stop());
3072 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
3074 pr_debug("%s: khubd exiting\n", usbcore_name);
3078 static struct usb_device_id hub_id_table [] = {
3079 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
3080 .bDeviceClass = USB_CLASS_HUB},
3081 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
3082 .bInterfaceClass = USB_CLASS_HUB},
3083 { } /* Terminating entry */
3086 MODULE_DEVICE_TABLE (usb, hub_id_table);
3088 static struct usb_driver hub_driver = {
3091 .disconnect = hub_disconnect,
3092 .suspend = hub_suspend,
3093 .resume = hub_resume,
3094 .reset_resume = hub_reset_resume,
3095 .pre_reset = hub_pre_reset,
3096 .post_reset = hub_post_reset,
3098 .id_table = hub_id_table,
3099 .supports_autosuspend = 1,
3102 int usb_hub_init(void)
3104 if (usb_register(&hub_driver) < 0) {
3105 printk(KERN_ERR "%s: can't register hub driver\n",
3110 khubd_task = kthread_run(hub_thread, NULL, "khubd");
3111 if (!IS_ERR(khubd_task))
3114 /* Fall through if kernel_thread failed */
3115 usb_deregister(&hub_driver);
3116 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
3121 void usb_hub_cleanup(void)
3123 kthread_stop(khubd_task);
3126 * Hub resources are freed for us by usb_deregister. It calls
3127 * usb_driver_purge on every device which in turn calls that
3128 * devices disconnect function if it is using this driver.
3129 * The hub_disconnect function takes care of releasing the
3130 * individual hub resources. -greg
3132 usb_deregister(&hub_driver);
3133 } /* usb_hub_cleanup() */
3135 static int descriptors_changed(struct usb_device *udev,
3136 struct usb_device_descriptor *old_device_descriptor)
3140 unsigned serial_len = 0;
3142 unsigned old_length;
3146 if (memcmp(&udev->descriptor, old_device_descriptor,
3147 sizeof(*old_device_descriptor)) != 0)
3150 /* Since the idVendor, idProduct, and bcdDevice values in the
3151 * device descriptor haven't changed, we will assume the
3152 * Manufacturer and Product strings haven't changed either.
3153 * But the SerialNumber string could be different (e.g., a
3154 * different flash card of the same brand).
3157 serial_len = strlen(udev->serial) + 1;
3160 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3161 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3162 len = max(len, old_length);
3165 buf = kmalloc(len, GFP_NOIO);
3167 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
3168 /* assume the worst */
3171 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
3172 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
3173 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
3175 if (length != old_length) {
3176 dev_dbg(&udev->dev, "config index %d, error %d\n",
3181 if (memcmp (buf, udev->rawdescriptors[index], old_length)
3183 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
3185 ((struct usb_config_descriptor *) buf)->
3186 bConfigurationValue);
3192 if (!changed && serial_len) {
3193 length = usb_string(udev, udev->descriptor.iSerialNumber,
3195 if (length + 1 != serial_len) {
3196 dev_dbg(&udev->dev, "serial string error %d\n",
3199 } else if (memcmp(buf, udev->serial, length) != 0) {
3200 dev_dbg(&udev->dev, "serial string changed\n");
3210 * usb_reset_device - perform a USB port reset to reinitialize a device
3211 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3213 * WARNING - don't use this routine to reset a composite device
3214 * (one with multiple interfaces owned by separate drivers)!
3215 * Use usb_reset_composite_device() instead.
3217 * Do a port reset, reassign the device's address, and establish its
3218 * former operating configuration. If the reset fails, or the device's
3219 * descriptors change from their values before the reset, or the original
3220 * configuration and altsettings cannot be restored, a flag will be set
3221 * telling khubd to pretend the device has been disconnected and then
3222 * re-connected. All drivers will be unbound, and the device will be
3223 * re-enumerated and probed all over again.
3225 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3226 * flagged for logical disconnection, or some other negative error code
3227 * if the reset wasn't even attempted.
3229 * The caller must own the device lock. For example, it's safe to use
3230 * this from a driver probe() routine after downloading new firmware.
3231 * For calls that might not occur during probe(), drivers should lock
3232 * the device using usb_lock_device_for_reset().
3234 * Locking exception: This routine may also be called from within an
3235 * autoresume handler. Such usage won't conflict with other tasks
3236 * holding the device lock because these tasks should always call
3237 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3239 int usb_reset_device(struct usb_device *udev)
3241 struct usb_device *parent_hdev = udev->parent;
3242 struct usb_hub *parent_hub;
3243 struct usb_device_descriptor descriptor = udev->descriptor;
3245 int port1 = udev->portnum;
3247 if (udev->state == USB_STATE_NOTATTACHED ||
3248 udev->state == USB_STATE_SUSPENDED) {
3249 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3255 /* this requires hcd-specific logic; see OHCI hc_restart() */
3256 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
3259 parent_hub = hdev_to_hub(parent_hdev);
3261 set_bit(port1, parent_hub->busy_bits);
3262 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
3264 /* ep0 maxpacket size may change; let the HCD know about it.
3265 * Other endpoints will be handled by re-enumeration. */
3266 usb_ep0_reinit(udev);
3267 ret = hub_port_init(parent_hub, udev, port1, i);
3268 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
3271 clear_bit(port1, parent_hub->busy_bits);
3272 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
3273 usb_enable_root_hub_irq(parent_hdev->bus);
3278 /* Device might have changed firmware (DFU or similar) */
3279 if (descriptors_changed(udev, &descriptor)) {
3280 dev_info(&udev->dev, "device firmware changed\n");
3281 udev->descriptor = descriptor; /* for disconnect() calls */
3285 if (!udev->actconfig)
3288 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3289 USB_REQ_SET_CONFIGURATION, 0,
3290 udev->actconfig->desc.bConfigurationValue, 0,
3291 NULL, 0, USB_CTRL_SET_TIMEOUT);
3294 "can't restore configuration #%d (error=%d)\n",
3295 udev->actconfig->desc.bConfigurationValue, ret);
3298 usb_set_device_state(udev, USB_STATE_CONFIGURED);
3300 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
3301 struct usb_interface *intf = udev->actconfig->interface[i];
3302 struct usb_interface_descriptor *desc;
3304 /* set_interface resets host side toggle even
3305 * for altsetting zero. the interface may have no driver.
3307 desc = &intf->cur_altsetting->desc;
3308 ret = usb_set_interface(udev, desc->bInterfaceNumber,
3309 desc->bAlternateSetting);
3311 dev_err(&udev->dev, "failed to restore interface %d "
3312 "altsetting %d (error=%d)\n",
3313 desc->bInterfaceNumber,
3314 desc->bAlternateSetting,
3324 hub_port_logical_disconnect(parent_hub, port1);
3327 EXPORT_SYMBOL_GPL(usb_reset_device);
3330 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3331 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3332 * @iface: interface bound to the driver making the request (optional)
3334 * Warns all drivers bound to registered interfaces (using their pre_reset
3335 * method), performs the port reset, and then lets the drivers know that
3336 * the reset is over (using their post_reset method).
3338 * Return value is the same as for usb_reset_device().
3340 * The caller must own the device lock. For example, it's safe to use
3341 * this from a driver probe() routine after downloading new firmware.
3342 * For calls that might not occur during probe(), drivers should lock
3343 * the device using usb_lock_device_for_reset().
3345 int usb_reset_composite_device(struct usb_device *udev,
3346 struct usb_interface *iface)
3350 struct usb_host_config *config = udev->actconfig;
3352 if (udev->state == USB_STATE_NOTATTACHED ||
3353 udev->state == USB_STATE_SUSPENDED) {
3354 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3359 /* Prevent autosuspend during the reset */
3360 usb_autoresume_device(udev);
3362 if (iface && iface->condition != USB_INTERFACE_BINDING)
3366 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3367 struct usb_interface *cintf = config->interface[i];
3368 struct usb_driver *drv;
3370 if (cintf->dev.driver) {
3371 drv = to_usb_driver(cintf->dev.driver);
3373 (drv->pre_reset)(cintf);
3374 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
3379 ret = usb_reset_device(udev);
3382 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3383 struct usb_interface *cintf = config->interface[i];
3384 struct usb_driver *drv;
3386 if (cintf->dev.driver) {
3387 drv = to_usb_driver(cintf->dev.driver);
3388 if (drv->post_reset)
3389 (drv->post_reset)(cintf);
3390 /* FIXME: Unbind if post_reset returns an error or isn't defined */
3395 usb_autosuspend_device(udev);
3398 EXPORT_SYMBOL_GPL(usb_reset_composite_device);