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/otg.h>
24 #include <linux/usb/quirks.h>
25 #include <linux/kthread.h>
26 #include <linux/mutex.h>
27 #include <linux/freezer.h>
28 #include <linux/random.h>
29 #include <linux/pm_qos.h>
31 #include <asm/uaccess.h>
32 #include <asm/byteorder.h>
36 /* if we are in debug mode, always announce new devices */
38 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
39 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
43 #define USB_VENDOR_GENESYS_LOGIC 0x05e3
44 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01
46 static inline int hub_is_superspeed(struct usb_device *hdev)
48 return (hdev->descriptor.bDeviceProtocol == USB_HUB_PR_SS);
51 /* Protect struct usb_device->state and ->children members
52 * Note: Both are also protected by ->dev.sem, except that ->state can
53 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
54 static DEFINE_SPINLOCK(device_state_lock);
56 /* khubd's worklist and its lock */
57 static DEFINE_SPINLOCK(hub_event_lock);
58 static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
61 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
63 static struct task_struct *khubd_task;
65 /* cycle leds on hubs that aren't blinking for attention */
66 static bool blinkenlights = 0;
67 module_param (blinkenlights, bool, S_IRUGO);
68 MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
71 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
72 * 10 seconds to send reply for the initial 64-byte descriptor request.
74 /* define initial 64-byte descriptor request timeout in milliseconds */
75 static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
76 module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
77 MODULE_PARM_DESC(initial_descriptor_timeout,
78 "initial 64-byte descriptor request timeout in milliseconds "
79 "(default 5000 - 5.0 seconds)");
82 * As of 2.6.10 we introduce a new USB device initialization scheme which
83 * closely resembles the way Windows works. Hopefully it will be compatible
84 * with a wider range of devices than the old scheme. However some previously
85 * working devices may start giving rise to "device not accepting address"
86 * errors; if that happens the user can try the old scheme by adjusting the
87 * following module parameters.
89 * For maximum flexibility there are two boolean parameters to control the
90 * hub driver's behavior. On the first initialization attempt, if the
91 * "old_scheme_first" parameter is set then the old scheme will be used,
92 * otherwise the new scheme is used. If that fails and "use_both_schemes"
93 * is set, then the driver will make another attempt, using the other scheme.
95 static bool old_scheme_first = 0;
96 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
97 MODULE_PARM_DESC(old_scheme_first,
98 "start with the old device initialization scheme");
100 static bool use_both_schemes = 1;
101 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
102 MODULE_PARM_DESC(use_both_schemes,
103 "try the other device initialization scheme if the "
106 /* Mutual exclusion for EHCI CF initialization. This interferes with
107 * port reset on some companion controllers.
109 DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
110 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
112 #define HUB_DEBOUNCE_TIMEOUT 2000
113 #define HUB_DEBOUNCE_STEP 25
114 #define HUB_DEBOUNCE_STABLE 100
116 static int usb_reset_and_verify_device(struct usb_device *udev);
118 static inline char *portspeed(struct usb_hub *hub, int portstatus)
120 if (hub_is_superspeed(hub->hdev))
122 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
124 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
130 /* Note that hdev or one of its children must be locked! */
131 struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev)
133 if (!hdev || !hdev->actconfig || !hdev->maxchild)
135 return usb_get_intfdata(hdev->actconfig->interface[0]);
138 static int usb_device_supports_lpm(struct usb_device *udev)
140 /* USB 2.1 (and greater) devices indicate LPM support through
141 * their USB 2.0 Extended Capabilities BOS descriptor.
143 if (udev->speed == USB_SPEED_HIGH) {
144 if (udev->bos->ext_cap &&
146 le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
151 /* All USB 3.0 must support LPM, but we need their max exit latency
152 * information from the SuperSpeed Extended Capabilities BOS descriptor.
154 if (!udev->bos->ss_cap) {
155 dev_warn(&udev->dev, "No LPM exit latency info found. "
156 "Power management will be impacted.\n");
159 if (udev->parent->lpm_capable)
162 dev_warn(&udev->dev, "Parent hub missing LPM exit latency info. "
163 "Power management will be impacted.\n");
168 * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
171 static void usb_set_lpm_mel(struct usb_device *udev,
172 struct usb3_lpm_parameters *udev_lpm_params,
173 unsigned int udev_exit_latency,
175 struct usb3_lpm_parameters *hub_lpm_params,
176 unsigned int hub_exit_latency)
178 unsigned int total_mel;
179 unsigned int device_mel;
180 unsigned int hub_mel;
183 * Calculate the time it takes to transition all links from the roothub
184 * to the parent hub into U0. The parent hub must then decode the
185 * packet (hub header decode latency) to figure out which port it was
188 * The Hub Header decode latency is expressed in 0.1us intervals (0x1
189 * means 0.1us). Multiply that by 100 to get nanoseconds.
191 total_mel = hub_lpm_params->mel +
192 (hub->descriptor->u.ss.bHubHdrDecLat * 100);
195 * How long will it take to transition the downstream hub's port into
196 * U0? The greater of either the hub exit latency or the device exit
199 * The BOS U1/U2 exit latencies are expressed in 1us intervals.
200 * Multiply that by 1000 to get nanoseconds.
202 device_mel = udev_exit_latency * 1000;
203 hub_mel = hub_exit_latency * 1000;
204 if (device_mel > hub_mel)
205 total_mel += device_mel;
207 total_mel += hub_mel;
209 udev_lpm_params->mel = total_mel;
213 * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
214 * a transition from either U1 or U2.
216 static void usb_set_lpm_pel(struct usb_device *udev,
217 struct usb3_lpm_parameters *udev_lpm_params,
218 unsigned int udev_exit_latency,
220 struct usb3_lpm_parameters *hub_lpm_params,
221 unsigned int hub_exit_latency,
222 unsigned int port_to_port_exit_latency)
224 unsigned int first_link_pel;
225 unsigned int hub_pel;
228 * First, the device sends an LFPS to transition the link between the
229 * device and the parent hub into U0. The exit latency is the bigger of
230 * the device exit latency or the hub exit latency.
232 if (udev_exit_latency > hub_exit_latency)
233 first_link_pel = udev_exit_latency * 1000;
235 first_link_pel = hub_exit_latency * 1000;
238 * When the hub starts to receive the LFPS, there is a slight delay for
239 * it to figure out that one of the ports is sending an LFPS. Then it
240 * will forward the LFPS to its upstream link. The exit latency is the
241 * delay, plus the PEL that we calculated for this hub.
243 hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel;
246 * According to figure C-7 in the USB 3.0 spec, the PEL for this device
247 * is the greater of the two exit latencies.
249 if (first_link_pel > hub_pel)
250 udev_lpm_params->pel = first_link_pel;
252 udev_lpm_params->pel = hub_pel;
256 * Set the System Exit Latency (SEL) to indicate the total worst-case time from
257 * when a device initiates a transition to U0, until when it will receive the
258 * first packet from the host controller.
260 * Section C.1.5.1 describes the four components to this:
262 * - t2: time for the ERDY to make it from the device to the host.
263 * - t3: a host-specific delay to process the ERDY.
264 * - t4: time for the packet to make it from the host to the device.
266 * t3 is specific to both the xHCI host and the platform the host is integrated
267 * into. The Intel HW folks have said it's negligible, FIXME if a different
268 * vendor says otherwise.
270 static void usb_set_lpm_sel(struct usb_device *udev,
271 struct usb3_lpm_parameters *udev_lpm_params)
273 struct usb_device *parent;
274 unsigned int num_hubs;
275 unsigned int total_sel;
277 /* t1 = device PEL */
278 total_sel = udev_lpm_params->pel;
279 /* How many external hubs are in between the device & the root port. */
280 for (parent = udev->parent, num_hubs = 0; parent->parent;
281 parent = parent->parent)
283 /* t2 = 2.1us + 250ns * (num_hubs - 1) */
285 total_sel += 2100 + 250 * (num_hubs - 1);
287 /* t4 = 250ns * num_hubs */
288 total_sel += 250 * num_hubs;
290 udev_lpm_params->sel = total_sel;
293 static void usb_set_lpm_parameters(struct usb_device *udev)
296 unsigned int port_to_port_delay;
297 unsigned int udev_u1_del;
298 unsigned int udev_u2_del;
299 unsigned int hub_u1_del;
300 unsigned int hub_u2_del;
302 if (!udev->lpm_capable || udev->speed != USB_SPEED_SUPER)
305 hub = usb_hub_to_struct_hub(udev->parent);
306 /* It doesn't take time to transition the roothub into U0, since it
307 * doesn't have an upstream link.
312 udev_u1_del = udev->bos->ss_cap->bU1devExitLat;
313 udev_u2_del = udev->bos->ss_cap->bU2DevExitLat;
314 hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat;
315 hub_u2_del = udev->parent->bos->ss_cap->bU2DevExitLat;
317 usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del,
318 hub, &udev->parent->u1_params, hub_u1_del);
320 usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del,
321 hub, &udev->parent->u2_params, hub_u2_del);
324 * Appendix C, section C.2.2.2, says that there is a slight delay from
325 * when the parent hub notices the downstream port is trying to
326 * transition to U0 to when the hub initiates a U0 transition on its
327 * upstream port. The section says the delays are tPort2PortU1EL and
328 * tPort2PortU2EL, but it doesn't define what they are.
330 * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
331 * about the same delays. Use the maximum delay calculations from those
332 * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
333 * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
334 * assume the device exit latencies they are talking about are the hub
337 * What do we do if the U2 exit latency is less than the U1 exit
338 * latency? It's possible, although not likely...
340 port_to_port_delay = 1;
342 usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del,
343 hub, &udev->parent->u1_params, hub_u1_del,
346 if (hub_u2_del > hub_u1_del)
347 port_to_port_delay = 1 + hub_u2_del - hub_u1_del;
349 port_to_port_delay = 1 + hub_u1_del;
351 usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del,
352 hub, &udev->parent->u2_params, hub_u2_del,
355 /* Now that we've got PEL, calculate SEL. */
356 usb_set_lpm_sel(udev, &udev->u1_params);
357 usb_set_lpm_sel(udev, &udev->u2_params);
360 /* USB 2.0 spec Section 11.24.4.5 */
361 static int get_hub_descriptor(struct usb_device *hdev, void *data)
366 if (hub_is_superspeed(hdev)) {
367 dtype = USB_DT_SS_HUB;
368 size = USB_DT_SS_HUB_SIZE;
371 size = sizeof(struct usb_hub_descriptor);
374 for (i = 0; i < 3; i++) {
375 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
376 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
377 dtype << 8, 0, data, size,
378 USB_CTRL_GET_TIMEOUT);
379 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
386 * USB 2.0 spec Section 11.24.2.1
388 static int clear_hub_feature(struct usb_device *hdev, int feature)
390 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
391 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
395 * USB 2.0 spec Section 11.24.2.2
397 int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature)
399 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
400 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
405 * USB 2.0 spec Section 11.24.2.13
407 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
409 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
410 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
415 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
416 * for info about using port indicators
418 static void set_port_led(
424 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
425 USB_PORT_FEAT_INDICATOR);
427 dev_dbg (hub->intfdev,
428 "port %d indicator %s status %d\n",
430 ({ char *s; switch (selector) {
431 case HUB_LED_AMBER: s = "amber"; break;
432 case HUB_LED_GREEN: s = "green"; break;
433 case HUB_LED_OFF: s = "off"; break;
434 case HUB_LED_AUTO: s = "auto"; break;
435 default: s = "??"; break;
440 #define LED_CYCLE_PERIOD ((2*HZ)/3)
442 static void led_work (struct work_struct *work)
444 struct usb_hub *hub =
445 container_of(work, struct usb_hub, leds.work);
446 struct usb_device *hdev = hub->hdev;
448 unsigned changed = 0;
451 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
454 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
455 unsigned selector, mode;
457 /* 30%-50% duty cycle */
459 switch (hub->indicator[i]) {
461 case INDICATOR_CYCLE:
463 selector = HUB_LED_AUTO;
464 mode = INDICATOR_AUTO;
466 /* blinking green = sw attention */
467 case INDICATOR_GREEN_BLINK:
468 selector = HUB_LED_GREEN;
469 mode = INDICATOR_GREEN_BLINK_OFF;
471 case INDICATOR_GREEN_BLINK_OFF:
472 selector = HUB_LED_OFF;
473 mode = INDICATOR_GREEN_BLINK;
475 /* blinking amber = hw attention */
476 case INDICATOR_AMBER_BLINK:
477 selector = HUB_LED_AMBER;
478 mode = INDICATOR_AMBER_BLINK_OFF;
480 case INDICATOR_AMBER_BLINK_OFF:
481 selector = HUB_LED_OFF;
482 mode = INDICATOR_AMBER_BLINK;
484 /* blink green/amber = reserved */
485 case INDICATOR_ALT_BLINK:
486 selector = HUB_LED_GREEN;
487 mode = INDICATOR_ALT_BLINK_OFF;
489 case INDICATOR_ALT_BLINK_OFF:
490 selector = HUB_LED_AMBER;
491 mode = INDICATOR_ALT_BLINK;
496 if (selector != HUB_LED_AUTO)
498 set_port_led(hub, i + 1, selector);
499 hub->indicator[i] = mode;
501 if (!changed && blinkenlights) {
503 cursor %= hub->descriptor->bNbrPorts;
504 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
505 hub->indicator[cursor] = INDICATOR_CYCLE;
509 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
512 /* use a short timeout for hub/port status fetches */
513 #define USB_STS_TIMEOUT 1000
514 #define USB_STS_RETRIES 5
517 * USB 2.0 spec Section 11.24.2.6
519 static int get_hub_status(struct usb_device *hdev,
520 struct usb_hub_status *data)
522 int i, status = -ETIMEDOUT;
524 for (i = 0; i < USB_STS_RETRIES &&
525 (status == -ETIMEDOUT || status == -EPIPE); i++) {
526 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
527 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
528 data, sizeof(*data), USB_STS_TIMEOUT);
534 * USB 2.0 spec Section 11.24.2.7
536 static int get_port_status(struct usb_device *hdev, int port1,
537 struct usb_port_status *data)
539 int i, status = -ETIMEDOUT;
541 for (i = 0; i < USB_STS_RETRIES &&
542 (status == -ETIMEDOUT || status == -EPIPE); i++) {
543 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
544 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
545 data, sizeof(*data), USB_STS_TIMEOUT);
550 static int hub_port_status(struct usb_hub *hub, int port1,
551 u16 *status, u16 *change)
555 mutex_lock(&hub->status_mutex);
556 ret = get_port_status(hub->hdev, port1, &hub->status->port);
559 dev_err(hub->intfdev,
560 "%s failed (err = %d)\n", __func__, ret);
564 *status = le16_to_cpu(hub->status->port.wPortStatus);
565 *change = le16_to_cpu(hub->status->port.wPortChange);
569 mutex_unlock(&hub->status_mutex);
573 static void kick_khubd(struct usb_hub *hub)
577 spin_lock_irqsave(&hub_event_lock, flags);
578 if (!hub->disconnected && list_empty(&hub->event_list)) {
579 list_add_tail(&hub->event_list, &hub_event_list);
581 /* Suppress autosuspend until khubd runs */
582 usb_autopm_get_interface_no_resume(
583 to_usb_interface(hub->intfdev));
584 wake_up(&khubd_wait);
586 spin_unlock_irqrestore(&hub_event_lock, flags);
589 void usb_kick_khubd(struct usb_device *hdev)
591 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
598 * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
599 * Notification, which indicates it had initiated remote wakeup.
601 * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
602 * device initiates resume, so the USB core will not receive notice of the
603 * resume through the normal hub interrupt URB.
605 void usb_wakeup_notification(struct usb_device *hdev,
606 unsigned int portnum)
613 hub = usb_hub_to_struct_hub(hdev);
615 set_bit(portnum, hub->wakeup_bits);
619 EXPORT_SYMBOL_GPL(usb_wakeup_notification);
621 /* completion function, fires on port status changes and various faults */
622 static void hub_irq(struct urb *urb)
624 struct usb_hub *hub = urb->context;
625 int status = urb->status;
630 case -ENOENT: /* synchronous unlink */
631 case -ECONNRESET: /* async unlink */
632 case -ESHUTDOWN: /* hardware going away */
635 default: /* presumably an error */
636 /* Cause a hub reset after 10 consecutive errors */
637 dev_dbg (hub->intfdev, "transfer --> %d\n", status);
638 if ((++hub->nerrors < 10) || hub->error)
643 /* let khubd handle things */
644 case 0: /* we got data: port status changed */
646 for (i = 0; i < urb->actual_length; ++i)
647 bits |= ((unsigned long) ((*hub->buffer)[i]))
649 hub->event_bits[0] = bits;
655 /* Something happened, let khubd figure it out */
662 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
663 && status != -ENODEV && status != -EPERM)
664 dev_err (hub->intfdev, "resubmit --> %d\n", status);
667 /* USB 2.0 spec Section 11.24.2.3 */
669 hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
671 /* Need to clear both directions for control ep */
672 if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) ==
673 USB_ENDPOINT_XFER_CONTROL) {
674 int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
675 HUB_CLEAR_TT_BUFFER, USB_RT_PORT,
676 devinfo ^ 0x8000, tt, NULL, 0, 1000);
680 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
681 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
686 * enumeration blocks khubd for a long time. we use keventd instead, since
687 * long blocking there is the exception, not the rule. accordingly, HCDs
688 * talking to TTs must queue control transfers (not just bulk and iso), so
689 * both can talk to the same hub concurrently.
691 static void hub_tt_work(struct work_struct *work)
693 struct usb_hub *hub =
694 container_of(work, struct usb_hub, tt.clear_work);
697 spin_lock_irqsave (&hub->tt.lock, flags);
698 while (!list_empty(&hub->tt.clear_list)) {
699 struct list_head *next;
700 struct usb_tt_clear *clear;
701 struct usb_device *hdev = hub->hdev;
702 const struct hc_driver *drv;
705 next = hub->tt.clear_list.next;
706 clear = list_entry (next, struct usb_tt_clear, clear_list);
707 list_del (&clear->clear_list);
709 /* drop lock so HCD can concurrently report other TT errors */
710 spin_unlock_irqrestore (&hub->tt.lock, flags);
711 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
712 if (status && status != -ENODEV)
714 "clear tt %d (%04x) error %d\n",
715 clear->tt, clear->devinfo, status);
717 /* Tell the HCD, even if the operation failed */
718 drv = clear->hcd->driver;
719 if (drv->clear_tt_buffer_complete)
720 (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
723 spin_lock_irqsave(&hub->tt.lock, flags);
725 spin_unlock_irqrestore (&hub->tt.lock, flags);
729 * usb_hub_set_port_power - control hub port's power state
732 * @set: expected status
734 * call this function to control port's power via setting or
735 * clearing the port's PORT_POWER feature.
737 int usb_hub_set_port_power(struct usb_device *hdev, int port1,
741 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
742 struct usb_port *port_dev = hub->ports[port1 - 1];
745 ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
747 ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
750 port_dev->power_is_on = set;
755 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
756 * @urb: an URB associated with the failed or incomplete split transaction
758 * High speed HCDs use this to tell the hub driver that some split control or
759 * bulk transaction failed in a way that requires clearing internal state of
760 * a transaction translator. This is normally detected (and reported) from
763 * It may not be possible for that hub to handle additional full (or low)
764 * speed transactions until that state is fully cleared out.
766 int usb_hub_clear_tt_buffer(struct urb *urb)
768 struct usb_device *udev = urb->dev;
769 int pipe = urb->pipe;
770 struct usb_tt *tt = udev->tt;
772 struct usb_tt_clear *clear;
774 /* we've got to cope with an arbitrary number of pending TT clears,
775 * since each TT has "at least two" buffers that can need it (and
776 * there can be many TTs per hub). even if they're uncommon.
778 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
779 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
780 /* FIXME recover somehow ... RESET_TT? */
784 /* info that CLEAR_TT_BUFFER needs */
785 clear->tt = tt->multi ? udev->ttport : 1;
786 clear->devinfo = usb_pipeendpoint (pipe);
787 clear->devinfo |= udev->devnum << 4;
788 clear->devinfo |= usb_pipecontrol (pipe)
789 ? (USB_ENDPOINT_XFER_CONTROL << 11)
790 : (USB_ENDPOINT_XFER_BULK << 11);
791 if (usb_pipein (pipe))
792 clear->devinfo |= 1 << 15;
794 /* info for completion callback */
795 clear->hcd = bus_to_hcd(udev->bus);
798 /* tell keventd to clear state for this TT */
799 spin_lock_irqsave (&tt->lock, flags);
800 list_add_tail (&clear->clear_list, &tt->clear_list);
801 schedule_work(&tt->clear_work);
802 spin_unlock_irqrestore (&tt->lock, flags);
805 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
807 /* If do_delay is false, return the number of milliseconds the caller
810 static unsigned hub_power_on(struct usb_hub *hub, bool do_delay)
813 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
815 u16 wHubCharacteristics =
816 le16_to_cpu(hub->descriptor->wHubCharacteristics);
818 /* Enable power on each port. Some hubs have reserved values
819 * of LPSM (> 2) in their descriptors, even though they are
820 * USB 2.0 hubs. Some hubs do not implement port-power switching
821 * but only emulate it. In all cases, the ports won't work
822 * unless we send these messages to the hub.
824 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
825 dev_dbg(hub->intfdev, "enabling power on all ports\n");
827 dev_dbg(hub->intfdev, "trying to enable port power on "
828 "non-switchable hub\n");
829 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
830 if (hub->ports[port1 - 1]->power_is_on)
831 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
833 usb_clear_port_feature(hub->hdev, port1,
834 USB_PORT_FEAT_POWER);
836 /* Wait at least 100 msec for power to become stable */
837 delay = max(pgood_delay, (unsigned) 100);
843 static int hub_hub_status(struct usb_hub *hub,
844 u16 *status, u16 *change)
848 mutex_lock(&hub->status_mutex);
849 ret = get_hub_status(hub->hdev, &hub->status->hub);
852 dev_err(hub->intfdev,
853 "%s failed (err = %d)\n", __func__, ret);
855 *status = le16_to_cpu(hub->status->hub.wHubStatus);
856 *change = le16_to_cpu(hub->status->hub.wHubChange);
859 mutex_unlock(&hub->status_mutex);
863 static int hub_set_port_link_state(struct usb_hub *hub, int port1,
864 unsigned int link_status)
866 return set_port_feature(hub->hdev,
867 port1 | (link_status << 3),
868 USB_PORT_FEAT_LINK_STATE);
872 * If USB 3.0 ports are placed into the Disabled state, they will no longer
873 * detect any device connects or disconnects. This is generally not what the
874 * USB core wants, since it expects a disabled port to produce a port status
875 * change event when a new device connects.
877 * Instead, set the link state to Disabled, wait for the link to settle into
878 * that state, clear any change bits, and then put the port into the RxDetect
881 static int hub_usb3_port_disable(struct usb_hub *hub, int port1)
885 u16 portchange, portstatus;
887 if (!hub_is_superspeed(hub->hdev))
890 ret = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_SS_DISABLED);
894 /* Wait for the link to enter the disabled state. */
895 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
896 ret = hub_port_status(hub, port1, &portstatus, &portchange);
900 if ((portstatus & USB_PORT_STAT_LINK_STATE) ==
901 USB_SS_PORT_LS_SS_DISABLED)
903 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
905 msleep(HUB_DEBOUNCE_STEP);
907 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
908 dev_warn(hub->intfdev, "Could not disable port %d after %d ms\n",
911 return hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_RX_DETECT);
914 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
916 struct usb_device *hdev = hub->hdev;
919 if (hub->ports[port1 - 1]->child && set_state)
920 usb_set_device_state(hub->ports[port1 - 1]->child,
921 USB_STATE_NOTATTACHED);
923 if (hub_is_superspeed(hub->hdev))
924 ret = hub_usb3_port_disable(hub, port1);
926 ret = usb_clear_port_feature(hdev, port1,
927 USB_PORT_FEAT_ENABLE);
929 if (ret && ret != -ENODEV)
930 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
936 * Disable a port and mark a logical connect-change event, so that some
937 * time later khubd will disconnect() any existing usb_device on the port
938 * and will re-enumerate if there actually is a device attached.
940 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
942 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
943 hub_port_disable(hub, port1, 1);
945 /* FIXME let caller ask to power down the port:
946 * - some devices won't enumerate without a VBUS power cycle
947 * - SRP saves power that way
948 * - ... new call, TBD ...
949 * That's easy if this hub can switch power per-port, and
950 * khubd reactivates the port later (timer, SRP, etc).
951 * Powerdown must be optional, because of reset/DFU.
954 set_bit(port1, hub->change_bits);
959 * usb_remove_device - disable a device's port on its parent hub
960 * @udev: device to be disabled and removed
961 * Context: @udev locked, must be able to sleep.
963 * After @udev's port has been disabled, khubd is notified and it will
964 * see that the device has been disconnected. When the device is
965 * physically unplugged and something is plugged in, the events will
966 * be received and processed normally.
968 int usb_remove_device(struct usb_device *udev)
971 struct usb_interface *intf;
973 if (!udev->parent) /* Can't remove a root hub */
975 hub = usb_hub_to_struct_hub(udev->parent);
976 intf = to_usb_interface(hub->intfdev);
978 usb_autopm_get_interface(intf);
979 set_bit(udev->portnum, hub->removed_bits);
980 hub_port_logical_disconnect(hub, udev->portnum);
981 usb_autopm_put_interface(intf);
985 enum hub_activation_type {
986 HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */
987 HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
990 static void hub_init_func2(struct work_struct *ws);
991 static void hub_init_func3(struct work_struct *ws);
993 static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
995 struct usb_device *hdev = hub->hdev;
1000 bool need_debounce_delay = false;
1003 /* Continue a partial initialization */
1004 if (type == HUB_INIT2)
1006 if (type == HUB_INIT3)
1009 /* The superspeed hub except for root hub has to use Hub Depth
1010 * value as an offset into the route string to locate the bits
1011 * it uses to determine the downstream port number. So hub driver
1012 * should send a set hub depth request to superspeed hub after
1013 * the superspeed hub is set configuration in initialization or
1016 * After a resume, port power should still be on.
1017 * For any other type of activation, turn it on.
1019 if (type != HUB_RESUME) {
1020 if (hdev->parent && hub_is_superspeed(hdev)) {
1021 ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
1022 HUB_SET_DEPTH, USB_RT_HUB,
1023 hdev->level - 1, 0, NULL, 0,
1024 USB_CTRL_SET_TIMEOUT);
1026 dev_err(hub->intfdev,
1027 "set hub depth failed\n");
1030 /* Speed up system boot by using a delayed_work for the
1031 * hub's initial power-up delays. This is pretty awkward
1032 * and the implementation looks like a home-brewed sort of
1033 * setjmp/longjmp, but it saves at least 100 ms for each
1034 * root hub (assuming usbcore is compiled into the kernel
1035 * rather than as a module). It adds up.
1037 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
1038 * because for those activation types the ports have to be
1039 * operational when we return. In theory this could be done
1040 * for HUB_POST_RESET, but it's easier not to.
1042 if (type == HUB_INIT) {
1043 delay = hub_power_on(hub, false);
1044 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func2);
1045 schedule_delayed_work(&hub->init_work,
1046 msecs_to_jiffies(delay));
1048 /* Suppress autosuspend until init is done */
1049 usb_autopm_get_interface_no_resume(
1050 to_usb_interface(hub->intfdev));
1051 return; /* Continues at init2: below */
1052 } else if (type == HUB_RESET_RESUME) {
1053 /* The internal host controller state for the hub device
1054 * may be gone after a host power loss on system resume.
1055 * Update the device's info so the HW knows it's a hub.
1057 hcd = bus_to_hcd(hdev->bus);
1058 if (hcd->driver->update_hub_device) {
1059 ret = hcd->driver->update_hub_device(hcd, hdev,
1060 &hub->tt, GFP_NOIO);
1062 dev_err(hub->intfdev, "Host not "
1063 "accepting hub info "
1065 dev_err(hub->intfdev, "LS/FS devices "
1066 "and hubs may not work "
1067 "under this hub\n.");
1070 hub_power_on(hub, true);
1072 hub_power_on(hub, true);
1077 /* Check each port and set hub->change_bits to let khubd know
1078 * which ports need attention.
1080 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
1081 struct usb_device *udev = hub->ports[port1 - 1]->child;
1082 u16 portstatus, portchange;
1084 portstatus = portchange = 0;
1085 status = hub_port_status(hub, port1, &portstatus, &portchange);
1086 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
1087 dev_dbg(hub->intfdev,
1088 "port %d: status %04x change %04x\n",
1089 port1, portstatus, portchange);
1091 /* After anything other than HUB_RESUME (i.e., initialization
1092 * or any sort of reset), every port should be disabled.
1093 * Unconnected ports should likewise be disabled (paranoia),
1094 * and so should ports for which we have no usb_device.
1096 if ((portstatus & USB_PORT_STAT_ENABLE) && (
1097 type != HUB_RESUME ||
1098 !(portstatus & USB_PORT_STAT_CONNECTION) ||
1100 udev->state == USB_STATE_NOTATTACHED)) {
1102 * USB3 protocol ports will automatically transition
1103 * to Enabled state when detect an USB3.0 device attach.
1104 * Do not disable USB3 protocol ports.
1106 if (!hub_is_superspeed(hdev)) {
1107 usb_clear_port_feature(hdev, port1,
1108 USB_PORT_FEAT_ENABLE);
1109 portstatus &= ~USB_PORT_STAT_ENABLE;
1111 /* Pretend that power was lost for USB3 devs */
1112 portstatus &= ~USB_PORT_STAT_ENABLE;
1116 /* Clear status-change flags; we'll debounce later */
1117 if (portchange & USB_PORT_STAT_C_CONNECTION) {
1118 need_debounce_delay = true;
1119 usb_clear_port_feature(hub->hdev, port1,
1120 USB_PORT_FEAT_C_CONNECTION);
1122 if (portchange & USB_PORT_STAT_C_ENABLE) {
1123 need_debounce_delay = true;
1124 usb_clear_port_feature(hub->hdev, port1,
1125 USB_PORT_FEAT_C_ENABLE);
1127 if (portchange & USB_PORT_STAT_C_RESET) {
1128 need_debounce_delay = true;
1129 usb_clear_port_feature(hub->hdev, port1,
1130 USB_PORT_FEAT_C_RESET);
1132 if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
1133 hub_is_superspeed(hub->hdev)) {
1134 need_debounce_delay = true;
1135 usb_clear_port_feature(hub->hdev, port1,
1136 USB_PORT_FEAT_C_BH_PORT_RESET);
1138 /* We can forget about a "removed" device when there's a
1139 * physical disconnect or the connect status changes.
1141 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
1142 (portchange & USB_PORT_STAT_C_CONNECTION))
1143 clear_bit(port1, hub->removed_bits);
1145 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
1146 /* Tell khubd to disconnect the device or
1147 * check for a new connection
1149 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
1150 set_bit(port1, hub->change_bits);
1152 } else if (portstatus & USB_PORT_STAT_ENABLE) {
1153 bool port_resumed = (portstatus &
1154 USB_PORT_STAT_LINK_STATE) ==
1156 /* The power session apparently survived the resume.
1157 * If there was an overcurrent or suspend change
1158 * (i.e., remote wakeup request), have khubd
1159 * take care of it. Look at the port link state
1160 * for USB 3.0 hubs, since they don't have a suspend
1161 * change bit, and they don't set the port link change
1162 * bit on device-initiated resume.
1164 if (portchange || (hub_is_superspeed(hub->hdev) &&
1166 set_bit(port1, hub->change_bits);
1168 } else if (udev->persist_enabled) {
1169 struct usb_port *port_dev = hub->ports[port1 - 1];
1172 udev->reset_resume = 1;
1174 /* Don't set the change_bits when the device
1177 if (port_dev->power_is_on)
1178 set_bit(port1, hub->change_bits);
1181 /* The power session is gone; tell khubd */
1182 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1183 set_bit(port1, hub->change_bits);
1187 /* If no port-status-change flags were set, we don't need any
1188 * debouncing. If flags were set we can try to debounce the
1189 * ports all at once right now, instead of letting khubd do them
1190 * one at a time later on.
1192 * If any port-status changes do occur during this delay, khubd
1193 * will see them later and handle them normally.
1195 if (need_debounce_delay) {
1196 delay = HUB_DEBOUNCE_STABLE;
1198 /* Don't do a long sleep inside a workqueue routine */
1199 if (type == HUB_INIT2) {
1200 PREPARE_DELAYED_WORK(&hub->init_work, hub_init_func3);
1201 schedule_delayed_work(&hub->init_work,
1202 msecs_to_jiffies(delay));
1203 return; /* Continues at init3: below */
1211 status = usb_submit_urb(hub->urb, GFP_NOIO);
1213 dev_err(hub->intfdev, "activate --> %d\n", status);
1214 if (hub->has_indicators && blinkenlights)
1215 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
1217 /* Scan all ports that need attention */
1220 /* Allow autosuspend if it was suppressed */
1221 if (type <= HUB_INIT3)
1222 usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
1225 /* Implement the continuations for the delays above */
1226 static void hub_init_func2(struct work_struct *ws)
1228 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
1230 hub_activate(hub, HUB_INIT2);
1233 static void hub_init_func3(struct work_struct *ws)
1235 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
1237 hub_activate(hub, HUB_INIT3);
1240 enum hub_quiescing_type {
1241 HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
1244 static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
1246 struct usb_device *hdev = hub->hdev;
1249 cancel_delayed_work_sync(&hub->init_work);
1251 /* khubd and related activity won't re-trigger */
1254 if (type != HUB_SUSPEND) {
1255 /* Disconnect all the children */
1256 for (i = 0; i < hdev->maxchild; ++i) {
1257 if (hub->ports[i]->child)
1258 usb_disconnect(&hub->ports[i]->child);
1262 /* Stop khubd and related activity */
1263 usb_kill_urb(hub->urb);
1264 if (hub->has_indicators)
1265 cancel_delayed_work_sync(&hub->leds);
1267 flush_work(&hub->tt.clear_work);
1270 /* caller has locked the hub device */
1271 static int hub_pre_reset(struct usb_interface *intf)
1273 struct usb_hub *hub = usb_get_intfdata(intf);
1275 hub_quiesce(hub, HUB_PRE_RESET);
1279 /* caller has locked the hub device */
1280 static int hub_post_reset(struct usb_interface *intf)
1282 struct usb_hub *hub = usb_get_intfdata(intf);
1284 hub_activate(hub, HUB_POST_RESET);
1288 static int hub_configure(struct usb_hub *hub,
1289 struct usb_endpoint_descriptor *endpoint)
1291 struct usb_hcd *hcd;
1292 struct usb_device *hdev = hub->hdev;
1293 struct device *hub_dev = hub->intfdev;
1294 u16 hubstatus, hubchange;
1295 u16 wHubCharacteristics;
1298 char *message = "out of memory";
1302 hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
1308 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
1313 mutex_init(&hub->status_mutex);
1315 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
1316 if (!hub->descriptor) {
1321 /* Request the entire hub descriptor.
1322 * hub->descriptor can handle USB_MAXCHILDREN ports,
1323 * but the hub can/will return fewer bytes here.
1325 ret = get_hub_descriptor(hdev, hub->descriptor);
1327 message = "can't read hub descriptor";
1329 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
1330 message = "hub has too many ports!";
1333 } else if (hub->descriptor->bNbrPorts == 0) {
1334 message = "hub doesn't have any ports!";
1339 hdev->maxchild = hub->descriptor->bNbrPorts;
1340 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
1341 (hdev->maxchild == 1) ? "" : "s");
1343 hub->ports = kzalloc(hdev->maxchild * sizeof(struct usb_port *),
1350 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1351 if (hub_is_superspeed(hdev)) {
1359 /* FIXME for USB 3.0, skip for now */
1360 if ((wHubCharacteristics & HUB_CHAR_COMPOUND) &&
1361 !(hub_is_superspeed(hdev))) {
1363 char portstr [USB_MAXCHILDREN + 1];
1365 for (i = 0; i < hdev->maxchild; i++)
1366 portstr[i] = hub->descriptor->u.hs.DeviceRemovable
1367 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
1369 portstr[hdev->maxchild] = 0;
1370 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
1372 dev_dbg(hub_dev, "standalone hub\n");
1374 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1375 case HUB_CHAR_COMMON_LPSM:
1376 dev_dbg(hub_dev, "ganged power switching\n");
1378 case HUB_CHAR_INDV_PORT_LPSM:
1379 dev_dbg(hub_dev, "individual port power switching\n");
1381 case HUB_CHAR_NO_LPSM:
1383 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
1387 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1388 case HUB_CHAR_COMMON_OCPM:
1389 dev_dbg(hub_dev, "global over-current protection\n");
1391 case HUB_CHAR_INDV_PORT_OCPM:
1392 dev_dbg(hub_dev, "individual port over-current protection\n");
1394 case HUB_CHAR_NO_OCPM:
1396 dev_dbg(hub_dev, "no over-current protection\n");
1400 spin_lock_init (&hub->tt.lock);
1401 INIT_LIST_HEAD (&hub->tt.clear_list);
1402 INIT_WORK(&hub->tt.clear_work, hub_tt_work);
1403 switch (hdev->descriptor.bDeviceProtocol) {
1406 case USB_HUB_PR_HS_SINGLE_TT:
1407 dev_dbg(hub_dev, "Single TT\n");
1410 case USB_HUB_PR_HS_MULTI_TT:
1411 ret = usb_set_interface(hdev, 0, 1);
1413 dev_dbg(hub_dev, "TT per port\n");
1416 dev_err(hub_dev, "Using single TT (err %d)\n",
1421 /* USB 3.0 hubs don't have a TT */
1424 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
1425 hdev->descriptor.bDeviceProtocol);
1429 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1430 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
1431 case HUB_TTTT_8_BITS:
1432 if (hdev->descriptor.bDeviceProtocol != 0) {
1433 hub->tt.think_time = 666;
1434 dev_dbg(hub_dev, "TT requires at most %d "
1435 "FS bit times (%d ns)\n",
1436 8, hub->tt.think_time);
1439 case HUB_TTTT_16_BITS:
1440 hub->tt.think_time = 666 * 2;
1441 dev_dbg(hub_dev, "TT requires at most %d "
1442 "FS bit times (%d ns)\n",
1443 16, hub->tt.think_time);
1445 case HUB_TTTT_24_BITS:
1446 hub->tt.think_time = 666 * 3;
1447 dev_dbg(hub_dev, "TT requires at most %d "
1448 "FS bit times (%d ns)\n",
1449 24, hub->tt.think_time);
1451 case HUB_TTTT_32_BITS:
1452 hub->tt.think_time = 666 * 4;
1453 dev_dbg(hub_dev, "TT requires at most %d "
1454 "FS bit times (%d ns)\n",
1455 32, hub->tt.think_time);
1459 /* probe() zeroes hub->indicator[] */
1460 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1461 hub->has_indicators = 1;
1462 dev_dbg(hub_dev, "Port indicators are supported\n");
1465 dev_dbg(hub_dev, "power on to power good time: %dms\n",
1466 hub->descriptor->bPwrOn2PwrGood * 2);
1468 /* power budgeting mostly matters with bus-powered hubs,
1469 * and battery-powered root hubs (may provide just 8 mA).
1471 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
1473 message = "can't get hub status";
1476 le16_to_cpus(&hubstatus);
1477 hcd = bus_to_hcd(hdev->bus);
1478 if (hdev == hdev->bus->root_hub) {
1479 if (hcd->power_budget > 0)
1480 hdev->bus_mA = hcd->power_budget;
1482 hdev->bus_mA = full_load * hdev->maxchild;
1483 if (hdev->bus_mA >= full_load)
1484 hub->mA_per_port = full_load;
1486 hub->mA_per_port = hdev->bus_mA;
1487 hub->limited_power = 1;
1489 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1490 int remaining = hdev->bus_mA -
1491 hub->descriptor->bHubContrCurrent;
1493 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
1494 hub->descriptor->bHubContrCurrent);
1495 hub->limited_power = 1;
1497 if (remaining < hdev->maxchild * unit_load)
1499 "insufficient power available "
1500 "to use all downstream ports\n");
1501 hub->mA_per_port = unit_load; /* 7.2.1 */
1503 } else { /* Self-powered external hub */
1504 /* FIXME: What about battery-powered external hubs that
1505 * provide less current per port? */
1506 hub->mA_per_port = full_load;
1508 if (hub->mA_per_port < full_load)
1509 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
1512 /* Update the HCD's internal representation of this hub before khubd
1513 * starts getting port status changes for devices under the hub.
1515 if (hcd->driver->update_hub_device) {
1516 ret = hcd->driver->update_hub_device(hcd, hdev,
1517 &hub->tt, GFP_KERNEL);
1519 message = "can't update HCD hub info";
1524 ret = hub_hub_status(hub, &hubstatus, &hubchange);
1526 message = "can't get hub status";
1530 /* local power status reports aren't always correct */
1531 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1532 dev_dbg(hub_dev, "local power source is %s\n",
1533 (hubstatus & HUB_STATUS_LOCAL_POWER)
1534 ? "lost (inactive)" : "good");
1536 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1537 dev_dbg(hub_dev, "%sover-current condition exists\n",
1538 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1540 /* set up the interrupt endpoint
1541 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1542 * bytes as USB2.0[11.12.3] says because some hubs are known
1543 * to send more data (and thus cause overflow). For root hubs,
1544 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1545 * to be big enough for at least USB_MAXCHILDREN ports. */
1546 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
1547 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
1549 if (maxp > sizeof(*hub->buffer))
1550 maxp = sizeof(*hub->buffer);
1552 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
1558 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
1559 hub, endpoint->bInterval);
1561 /* maybe cycle the hub leds */
1562 if (hub->has_indicators && blinkenlights)
1563 hub->indicator [0] = INDICATOR_CYCLE;
1565 for (i = 0; i < hdev->maxchild; i++) {
1566 ret = usb_hub_create_port_device(hub, i + 1);
1568 dev_err(hub->intfdev,
1569 "couldn't create port%d device.\n", i + 1);
1571 goto fail_keep_maxchild;
1575 usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
1577 hub_activate(hub, HUB_INIT);
1583 dev_err (hub_dev, "config failed, %s (err %d)\n",
1585 /* hub_disconnect() frees urb and descriptor */
1589 static void hub_release(struct kref *kref)
1591 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1593 usb_put_intf(to_usb_interface(hub->intfdev));
1597 static unsigned highspeed_hubs;
1599 static void hub_disconnect(struct usb_interface *intf)
1601 struct usb_hub *hub = usb_get_intfdata(intf);
1602 struct usb_device *hdev = interface_to_usbdev(intf);
1605 /* Take the hub off the event list and don't let it be added again */
1606 spin_lock_irq(&hub_event_lock);
1607 if (!list_empty(&hub->event_list)) {
1608 list_del_init(&hub->event_list);
1609 usb_autopm_put_interface_no_suspend(intf);
1611 hub->disconnected = 1;
1612 spin_unlock_irq(&hub_event_lock);
1614 /* Disconnect all children and quiesce the hub */
1616 hub_quiesce(hub, HUB_DISCONNECT);
1618 /* Avoid races with recursively_mark_NOTATTACHED() */
1619 spin_lock_irq(&device_state_lock);
1620 port1 = hdev->maxchild;
1622 usb_set_intfdata(intf, NULL);
1623 spin_unlock_irq(&device_state_lock);
1625 for (; port1 > 0; --port1)
1626 usb_hub_remove_port_device(hub, port1);
1628 if (hub->hdev->speed == USB_SPEED_HIGH)
1631 usb_free_urb(hub->urb);
1633 kfree(hub->descriptor);
1637 pm_suspend_ignore_children(&intf->dev, false);
1638 kref_put(&hub->kref, hub_release);
1641 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1643 struct usb_host_interface *desc;
1644 struct usb_endpoint_descriptor *endpoint;
1645 struct usb_device *hdev;
1646 struct usb_hub *hub;
1648 desc = intf->cur_altsetting;
1649 hdev = interface_to_usbdev(intf);
1652 * Set default autosuspend delay as 0 to speedup bus suspend,
1653 * based on the below considerations:
1655 * - Unlike other drivers, the hub driver does not rely on the
1656 * autosuspend delay to provide enough time to handle a wakeup
1657 * event, and the submitted status URB is just to check future
1658 * change on hub downstream ports, so it is safe to do it.
1660 * - The patch might cause one or more auto supend/resume for
1661 * below very rare devices when they are plugged into hub
1664 * devices having trouble initializing, and disconnect
1665 * themselves from the bus and then reconnect a second
1668 * devices just for downloading firmware, and disconnects
1669 * themselves after completing it
1671 * For these quite rare devices, their drivers may change the
1672 * autosuspend delay of their parent hub in the probe() to one
1673 * appropriate value to avoid the subtle problem if someone
1676 * - The patch may cause one or more auto suspend/resume on
1677 * hub during running 'lsusb', but it is probably too
1678 * infrequent to worry about.
1680 * - Change autosuspend delay of hub can avoid unnecessary auto
1681 * suspend timer for hub, also may decrease power consumption
1684 pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
1686 /* Hubs have proper suspend/resume support. */
1687 usb_enable_autosuspend(hdev);
1689 if (hdev->level == MAX_TOPO_LEVEL) {
1691 "Unsupported bus topology: hub nested too deep\n");
1695 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1697 dev_warn(&intf->dev, "ignoring external hub\n");
1702 /* Some hubs have a subclass of 1, which AFAICT according to the */
1703 /* specs is not defined, but it works */
1704 if ((desc->desc.bInterfaceSubClass != 0) &&
1705 (desc->desc.bInterfaceSubClass != 1)) {
1707 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
1711 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1712 if (desc->desc.bNumEndpoints != 1)
1713 goto descriptor_error;
1715 endpoint = &desc->endpoint[0].desc;
1717 /* If it's not an interrupt in endpoint, we'd better punt! */
1718 if (!usb_endpoint_is_int_in(endpoint))
1719 goto descriptor_error;
1721 /* We found a hub */
1722 dev_info (&intf->dev, "USB hub found\n");
1724 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1726 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
1730 kref_init(&hub->kref);
1731 INIT_LIST_HEAD(&hub->event_list);
1732 hub->intfdev = &intf->dev;
1734 INIT_DELAYED_WORK(&hub->leds, led_work);
1735 INIT_DELAYED_WORK(&hub->init_work, NULL);
1738 usb_set_intfdata (intf, hub);
1739 intf->needs_remote_wakeup = 1;
1740 pm_suspend_ignore_children(&intf->dev, true);
1742 if (hdev->speed == USB_SPEED_HIGH)
1745 if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND)
1746 hub->quirk_check_port_auto_suspend = 1;
1748 if (hub_configure(hub, endpoint) >= 0)
1751 hub_disconnect (intf);
1756 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1758 struct usb_device *hdev = interface_to_usbdev (intf);
1759 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1761 /* assert ifno == 0 (part of hub spec) */
1763 case USBDEVFS_HUB_PORTINFO: {
1764 struct usbdevfs_hub_portinfo *info = user_data;
1767 spin_lock_irq(&device_state_lock);
1768 if (hdev->devnum <= 0)
1771 info->nports = hdev->maxchild;
1772 for (i = 0; i < info->nports; i++) {
1773 if (hub->ports[i]->child == NULL)
1777 hub->ports[i]->child->devnum;
1780 spin_unlock_irq(&device_state_lock);
1782 return info->nports + 1;
1791 * Allow user programs to claim ports on a hub. When a device is attached
1792 * to one of these "claimed" ports, the program will "own" the device.
1794 static int find_port_owner(struct usb_device *hdev, unsigned port1,
1795 struct dev_state ***ppowner)
1797 if (hdev->state == USB_STATE_NOTATTACHED)
1799 if (port1 == 0 || port1 > hdev->maxchild)
1802 /* This assumes that devices not managed by the hub driver
1803 * will always have maxchild equal to 0.
1805 *ppowner = &(usb_hub_to_struct_hub(hdev)->ports[port1 - 1]->port_owner);
1809 /* In the following three functions, the caller must hold hdev's lock */
1810 int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
1811 struct dev_state *owner)
1814 struct dev_state **powner;
1816 rc = find_port_owner(hdev, port1, &powner);
1825 int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
1826 struct dev_state *owner)
1829 struct dev_state **powner;
1831 rc = find_port_owner(hdev, port1, &powner);
1834 if (*powner != owner)
1840 void usb_hub_release_all_ports(struct usb_device *hdev, struct dev_state *owner)
1842 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1845 for (n = 0; n < hdev->maxchild; n++) {
1846 if (hub->ports[n]->port_owner == owner)
1847 hub->ports[n]->port_owner = NULL;
1852 /* The caller must hold udev's lock */
1853 bool usb_device_is_owned(struct usb_device *udev)
1855 struct usb_hub *hub;
1857 if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
1859 hub = usb_hub_to_struct_hub(udev->parent);
1860 return !!hub->ports[udev->portnum - 1]->port_owner;
1863 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1865 struct usb_hub *hub = usb_hub_to_struct_hub(udev);
1868 for (i = 0; i < udev->maxchild; ++i) {
1869 if (hub->ports[i]->child)
1870 recursively_mark_NOTATTACHED(hub->ports[i]->child);
1872 if (udev->state == USB_STATE_SUSPENDED)
1873 udev->active_duration -= jiffies;
1874 udev->state = USB_STATE_NOTATTACHED;
1878 * usb_set_device_state - change a device's current state (usbcore, hcds)
1879 * @udev: pointer to device whose state should be changed
1880 * @new_state: new state value to be stored
1882 * udev->state is _not_ fully protected by the device lock. Although
1883 * most transitions are made only while holding the lock, the state can
1884 * can change to USB_STATE_NOTATTACHED at almost any time. This
1885 * is so that devices can be marked as disconnected as soon as possible,
1886 * without having to wait for any semaphores to be released. As a result,
1887 * all changes to any device's state must be protected by the
1888 * device_state_lock spinlock.
1890 * Once a device has been added to the device tree, all changes to its state
1891 * should be made using this routine. The state should _not_ be set directly.
1893 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1894 * Otherwise udev->state is set to new_state, and if new_state is
1895 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1896 * to USB_STATE_NOTATTACHED.
1898 void usb_set_device_state(struct usb_device *udev,
1899 enum usb_device_state new_state)
1901 unsigned long flags;
1904 spin_lock_irqsave(&device_state_lock, flags);
1905 if (udev->state == USB_STATE_NOTATTACHED)
1907 else if (new_state != USB_STATE_NOTATTACHED) {
1909 /* root hub wakeup capabilities are managed out-of-band
1910 * and may involve silicon errata ... ignore them here.
1913 if (udev->state == USB_STATE_SUSPENDED
1914 || new_state == USB_STATE_SUSPENDED)
1915 ; /* No change to wakeup settings */
1916 else if (new_state == USB_STATE_CONFIGURED)
1917 wakeup = udev->actconfig->desc.bmAttributes
1918 & USB_CONFIG_ATT_WAKEUP;
1922 if (udev->state == USB_STATE_SUSPENDED &&
1923 new_state != USB_STATE_SUSPENDED)
1924 udev->active_duration -= jiffies;
1925 else if (new_state == USB_STATE_SUSPENDED &&
1926 udev->state != USB_STATE_SUSPENDED)
1927 udev->active_duration += jiffies;
1928 udev->state = new_state;
1930 recursively_mark_NOTATTACHED(udev);
1931 spin_unlock_irqrestore(&device_state_lock, flags);
1933 device_set_wakeup_capable(&udev->dev, wakeup);
1935 EXPORT_SYMBOL_GPL(usb_set_device_state);
1938 * Choose a device number.
1940 * Device numbers are used as filenames in usbfs. On USB-1.1 and
1941 * USB-2.0 buses they are also used as device addresses, however on
1942 * USB-3.0 buses the address is assigned by the controller hardware
1943 * and it usually is not the same as the device number.
1945 * WUSB devices are simple: they have no hubs behind, so the mapping
1946 * device <-> virtual port number becomes 1:1. Why? to simplify the
1947 * life of the device connection logic in
1948 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1949 * handshake we need to assign a temporary address in the unauthorized
1950 * space. For simplicity we use the first virtual port number found to
1951 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1952 * and that becomes it's address [X < 128] or its unauthorized address
1955 * We add 1 as an offset to the one-based USB-stack port number
1956 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1957 * 0 is reserved by USB for default address; (b) Linux's USB stack
1958 * uses always #1 for the root hub of the controller. So USB stack's
1959 * port #1, which is wusb virtual-port #0 has address #2.
1961 * Devices connected under xHCI are not as simple. The host controller
1962 * supports virtualization, so the hardware assigns device addresses and
1963 * the HCD must setup data structures before issuing a set address
1964 * command to the hardware.
1966 static void choose_devnum(struct usb_device *udev)
1969 struct usb_bus *bus = udev->bus;
1971 /* If khubd ever becomes multithreaded, this will need a lock */
1973 devnum = udev->portnum + 1;
1974 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
1976 /* Try to allocate the next devnum beginning at
1977 * bus->devnum_next. */
1978 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1981 devnum = find_next_zero_bit(bus->devmap.devicemap,
1983 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1986 set_bit(devnum, bus->devmap.devicemap);
1987 udev->devnum = devnum;
1991 static void release_devnum(struct usb_device *udev)
1993 if (udev->devnum > 0) {
1994 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1999 static void update_devnum(struct usb_device *udev, int devnum)
2001 /* The address for a WUSB device is managed by wusbcore. */
2003 udev->devnum = devnum;
2006 static void hub_free_dev(struct usb_device *udev)
2008 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2010 /* Root hubs aren't real devices, so don't free HCD resources */
2011 if (hcd->driver->free_dev && udev->parent)
2012 hcd->driver->free_dev(hcd, udev);
2016 * usb_disconnect - disconnect a device (usbcore-internal)
2017 * @pdev: pointer to device being disconnected
2018 * Context: !in_interrupt ()
2020 * Something got disconnected. Get rid of it and all of its children.
2022 * If *pdev is a normal device then the parent hub must already be locked.
2023 * If *pdev is a root hub then this routine will acquire the
2024 * usb_bus_list_lock on behalf of the caller.
2026 * Only hub drivers (including virtual root hub drivers for host
2027 * controllers) should ever call this.
2029 * This call is synchronous, and may not be used in an interrupt context.
2031 void usb_disconnect(struct usb_device **pdev)
2033 struct usb_device *udev = *pdev;
2034 struct usb_hub *hub = usb_hub_to_struct_hub(udev);
2037 /* mark the device as inactive, so any further urb submissions for
2038 * this device (and any of its children) will fail immediately.
2039 * this quiesces everything except pending urbs.
2041 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2042 dev_info(&udev->dev, "USB disconnect, device number %d\n",
2045 usb_lock_device(udev);
2047 /* Free up all the children before we remove this device */
2048 for (i = 0; i < udev->maxchild; i++) {
2049 if (hub->ports[i]->child)
2050 usb_disconnect(&hub->ports[i]->child);
2053 /* deallocate hcd/hardware state ... nuking all pending urbs and
2054 * cleaning up all state associated with the current configuration
2055 * so that the hardware is now fully quiesced.
2057 dev_dbg (&udev->dev, "unregistering device\n");
2058 usb_disable_device(udev, 0);
2059 usb_hcd_synchronize_unlinks(udev);
2062 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
2063 struct usb_port *port_dev = hub->ports[udev->portnum - 1];
2065 sysfs_remove_link(&udev->dev.kobj, "port");
2066 sysfs_remove_link(&port_dev->dev.kobj, "device");
2068 if (!port_dev->did_runtime_put)
2069 pm_runtime_put(&port_dev->dev);
2071 port_dev->did_runtime_put = false;
2074 usb_remove_ep_devs(&udev->ep0);
2075 usb_unlock_device(udev);
2077 /* Unregister the device. The device driver is responsible
2078 * for de-configuring the device and invoking the remove-device
2079 * notifier chain (used by usbfs and possibly others).
2081 device_del(&udev->dev);
2083 /* Free the device number and delete the parent's children[]
2084 * (or root_hub) pointer.
2086 release_devnum(udev);
2088 /* Avoid races with recursively_mark_NOTATTACHED() */
2089 spin_lock_irq(&device_state_lock);
2091 spin_unlock_irq(&device_state_lock);
2095 put_device(&udev->dev);
2098 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
2099 static void show_string(struct usb_device *udev, char *id, char *string)
2103 dev_info(&udev->dev, "%s: %s\n", id, string);
2106 static void announce_device(struct usb_device *udev)
2108 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
2109 le16_to_cpu(udev->descriptor.idVendor),
2110 le16_to_cpu(udev->descriptor.idProduct));
2111 dev_info(&udev->dev,
2112 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
2113 udev->descriptor.iManufacturer,
2114 udev->descriptor.iProduct,
2115 udev->descriptor.iSerialNumber);
2116 show_string(udev, "Product", udev->product);
2117 show_string(udev, "Manufacturer", udev->manufacturer);
2118 show_string(udev, "SerialNumber", udev->serial);
2121 static inline void announce_device(struct usb_device *udev) { }
2124 #ifdef CONFIG_USB_OTG
2125 #include "otg_whitelist.h"
2129 * usb_enumerate_device_otg - FIXME (usbcore-internal)
2130 * @udev: newly addressed device (in ADDRESS state)
2132 * Finish enumeration for On-The-Go devices
2134 static int usb_enumerate_device_otg(struct usb_device *udev)
2138 #ifdef CONFIG_USB_OTG
2140 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
2141 * to wake us after we've powered off VBUS; and HNP, switching roles
2142 * "host" to "peripheral". The OTG descriptor helps figure this out.
2144 if (!udev->bus->is_b_host
2146 && udev->parent == udev->bus->root_hub) {
2147 struct usb_otg_descriptor *desc = NULL;
2148 struct usb_bus *bus = udev->bus;
2150 /* descriptor may appear anywhere in config */
2151 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
2152 le16_to_cpu(udev->config[0].desc.wTotalLength),
2153 USB_DT_OTG, (void **) &desc) == 0) {
2154 if (desc->bmAttributes & USB_OTG_HNP) {
2155 unsigned port1 = udev->portnum;
2157 dev_info(&udev->dev,
2158 "Dual-Role OTG device on %sHNP port\n",
2159 (port1 == bus->otg_port)
2162 /* enable HNP before suspend, it's simpler */
2163 if (port1 == bus->otg_port)
2164 bus->b_hnp_enable = 1;
2165 err = usb_control_msg(udev,
2166 usb_sndctrlpipe(udev, 0),
2167 USB_REQ_SET_FEATURE, 0,
2169 ? USB_DEVICE_B_HNP_ENABLE
2170 : USB_DEVICE_A_ALT_HNP_SUPPORT,
2171 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
2173 /* OTG MESSAGE: report errors here,
2174 * customize to match your product.
2176 dev_info(&udev->dev,
2177 "can't set HNP mode: %d\n",
2179 bus->b_hnp_enable = 0;
2185 if (!is_targeted(udev)) {
2187 /* Maybe it can talk to us, though we can't talk to it.
2188 * (Includes HNP test device.)
2190 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
2191 err = usb_port_suspend(udev, PMSG_SUSPEND);
2193 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
2205 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
2206 * @udev: newly addressed device (in ADDRESS state)
2208 * This is only called by usb_new_device() and usb_authorize_device()
2209 * and FIXME -- all comments that apply to them apply here wrt to
2212 * If the device is WUSB and not authorized, we don't attempt to read
2213 * the string descriptors, as they will be errored out by the device
2214 * until it has been authorized.
2216 static int usb_enumerate_device(struct usb_device *udev)
2220 if (udev->config == NULL) {
2221 err = usb_get_configuration(udev);
2224 dev_err(&udev->dev, "can't read configurations, error %d\n",
2230 /* read the standard strings and cache them if present */
2231 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
2232 udev->manufacturer = usb_cache_string(udev,
2233 udev->descriptor.iManufacturer);
2234 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
2236 err = usb_enumerate_device_otg(udev);
2240 usb_detect_interface_quirks(udev);
2245 static void set_usb_port_removable(struct usb_device *udev)
2247 struct usb_device *hdev = udev->parent;
2248 struct usb_hub *hub;
2249 u8 port = udev->portnum;
2250 u16 wHubCharacteristics;
2251 bool removable = true;
2256 hub = usb_hub_to_struct_hub(udev->parent);
2258 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2260 if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
2263 if (hub_is_superspeed(hdev)) {
2264 if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable)
2268 if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
2273 udev->removable = USB_DEVICE_REMOVABLE;
2275 udev->removable = USB_DEVICE_FIXED;
2279 * usb_new_device - perform initial device setup (usbcore-internal)
2280 * @udev: newly addressed device (in ADDRESS state)
2282 * This is called with devices which have been detected but not fully
2283 * enumerated. The device descriptor is available, but not descriptors
2284 * for any device configuration. The caller must have locked either
2285 * the parent hub (if udev is a normal device) or else the
2286 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
2287 * udev has already been installed, but udev is not yet visible through
2288 * sysfs or other filesystem code.
2290 * It will return if the device is configured properly or not. Zero if
2291 * the interface was registered with the driver core; else a negative
2294 * This call is synchronous, and may not be used in an interrupt context.
2296 * Only the hub driver or root-hub registrar should ever call this.
2298 int usb_new_device(struct usb_device *udev)
2303 /* Initialize non-root-hub device wakeup to disabled;
2304 * device (un)configuration controls wakeup capable
2305 * sysfs power/wakeup controls wakeup enabled/disabled
2307 device_init_wakeup(&udev->dev, 0);
2310 /* Tell the runtime-PM framework the device is active */
2311 pm_runtime_set_active(&udev->dev);
2312 pm_runtime_get_noresume(&udev->dev);
2313 pm_runtime_use_autosuspend(&udev->dev);
2314 pm_runtime_enable(&udev->dev);
2316 /* By default, forbid autosuspend for all devices. It will be
2317 * allowed for hubs during binding.
2319 usb_disable_autosuspend(udev);
2321 err = usb_enumerate_device(udev); /* Read descriptors */
2324 dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
2325 udev->devnum, udev->bus->busnum,
2326 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
2327 /* export the usbdev device-node for libusb */
2328 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
2329 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
2331 /* Tell the world! */
2332 announce_device(udev);
2335 add_device_randomness(udev->serial, strlen(udev->serial));
2337 add_device_randomness(udev->product, strlen(udev->product));
2338 if (udev->manufacturer)
2339 add_device_randomness(udev->manufacturer,
2340 strlen(udev->manufacturer));
2342 device_enable_async_suspend(&udev->dev);
2345 * check whether the hub marks this port as non-removable. Do it
2346 * now so that platform-specific data can override it in
2350 set_usb_port_removable(udev);
2352 /* Register the device. The device driver is responsible
2353 * for configuring the device and invoking the add-device
2354 * notifier chain (used by usbfs and possibly others).
2356 err = device_add(&udev->dev);
2358 dev_err(&udev->dev, "can't device_add, error %d\n", err);
2362 /* Create link files between child device and usb port device. */
2364 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
2365 struct usb_port *port_dev = hub->ports[udev->portnum - 1];
2367 err = sysfs_create_link(&udev->dev.kobj,
2368 &port_dev->dev.kobj, "port");
2372 err = sysfs_create_link(&port_dev->dev.kobj,
2373 &udev->dev.kobj, "device");
2375 sysfs_remove_link(&udev->dev.kobj, "port");
2379 pm_runtime_get_sync(&port_dev->dev);
2382 (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
2383 usb_mark_last_busy(udev);
2384 pm_runtime_put_sync_autosuspend(&udev->dev);
2388 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2389 pm_runtime_disable(&udev->dev);
2390 pm_runtime_set_suspended(&udev->dev);
2396 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
2397 * @usb_dev: USB device
2399 * Move the USB device to a very basic state where interfaces are disabled
2400 * and the device is in fact unconfigured and unusable.
2402 * We share a lock (that we have) with device_del(), so we need to
2405 int usb_deauthorize_device(struct usb_device *usb_dev)
2407 usb_lock_device(usb_dev);
2408 if (usb_dev->authorized == 0)
2409 goto out_unauthorized;
2411 usb_dev->authorized = 0;
2412 usb_set_configuration(usb_dev, -1);
2415 usb_unlock_device(usb_dev);
2420 int usb_authorize_device(struct usb_device *usb_dev)
2424 usb_lock_device(usb_dev);
2425 if (usb_dev->authorized == 1)
2426 goto out_authorized;
2428 result = usb_autoresume_device(usb_dev);
2430 dev_err(&usb_dev->dev,
2431 "can't autoresume for authorization: %d\n", result);
2432 goto error_autoresume;
2434 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
2436 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
2437 "authorization: %d\n", result);
2438 goto error_device_descriptor;
2441 usb_dev->authorized = 1;
2442 /* Choose and set the configuration. This registers the interfaces
2443 * with the driver core and lets interface drivers bind to them.
2445 c = usb_choose_configuration(usb_dev);
2447 result = usb_set_configuration(usb_dev, c);
2449 dev_err(&usb_dev->dev,
2450 "can't set config #%d, error %d\n", c, result);
2451 /* This need not be fatal. The user can try to
2452 * set other configurations. */
2455 dev_info(&usb_dev->dev, "authorized to connect\n");
2457 error_device_descriptor:
2458 usb_autosuspend_device(usb_dev);
2461 usb_unlock_device(usb_dev); // complements locktree
2466 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2467 static unsigned hub_is_wusb(struct usb_hub *hub)
2469 struct usb_hcd *hcd;
2470 if (hub->hdev->parent != NULL) /* not a root hub? */
2472 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
2473 return hcd->wireless;
2477 #define PORT_RESET_TRIES 5
2478 #define SET_ADDRESS_TRIES 2
2479 #define GET_DESCRIPTOR_TRIES 2
2480 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2481 #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first)
2483 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
2484 #define HUB_SHORT_RESET_TIME 10
2485 #define HUB_BH_RESET_TIME 50
2486 #define HUB_LONG_RESET_TIME 200
2487 #define HUB_RESET_TIMEOUT 800
2489 static int hub_port_reset(struct usb_hub *hub, int port1,
2490 struct usb_device *udev, unsigned int delay, bool warm);
2492 /* Is a USB 3.0 port in the Inactive or Complinance Mode state?
2493 * Port worm reset is required to recover
2495 static bool hub_port_warm_reset_required(struct usb_hub *hub, u16 portstatus)
2497 return hub_is_superspeed(hub->hdev) &&
2498 (((portstatus & USB_PORT_STAT_LINK_STATE) ==
2499 USB_SS_PORT_LS_SS_INACTIVE) ||
2500 ((portstatus & USB_PORT_STAT_LINK_STATE) ==
2501 USB_SS_PORT_LS_COMP_MOD)) ;
2504 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
2505 struct usb_device *udev, unsigned int delay, bool warm)
2507 int delay_time, ret;
2511 for (delay_time = 0;
2512 delay_time < HUB_RESET_TIMEOUT;
2513 delay_time += delay) {
2514 /* wait to give the device a chance to reset */
2517 /* read and decode port status */
2518 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2522 /* The port state is unknown until the reset completes. */
2523 if (!(portstatus & USB_PORT_STAT_RESET))
2526 /* switch to the long delay after two short delay failures */
2527 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
2528 delay = HUB_LONG_RESET_TIME;
2530 dev_dbg (hub->intfdev,
2531 "port %d not %sreset yet, waiting %dms\n",
2532 port1, warm ? "warm " : "", delay);
2535 if ((portstatus & USB_PORT_STAT_RESET))
2538 if (hub_port_warm_reset_required(hub, portstatus))
2541 /* Device went away? */
2542 if (!(portstatus & USB_PORT_STAT_CONNECTION))
2545 /* bomb out completely if the connection bounced. A USB 3.0
2546 * connection may bounce if multiple warm resets were issued,
2547 * but the device may have successfully re-connected. Ignore it.
2549 if (!hub_is_superspeed(hub->hdev) &&
2550 (portchange & USB_PORT_STAT_C_CONNECTION))
2553 if (!(portstatus & USB_PORT_STAT_ENABLE))
2559 if (hub_is_wusb(hub))
2560 udev->speed = USB_SPEED_WIRELESS;
2561 else if (hub_is_superspeed(hub->hdev))
2562 udev->speed = USB_SPEED_SUPER;
2563 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
2564 udev->speed = USB_SPEED_HIGH;
2565 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
2566 udev->speed = USB_SPEED_LOW;
2568 udev->speed = USB_SPEED_FULL;
2572 static void hub_port_finish_reset(struct usb_hub *hub, int port1,
2573 struct usb_device *udev, int *status)
2577 /* TRSTRCY = 10 ms; plus some extra */
2580 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2582 update_devnum(udev, 0);
2583 /* The xHC may think the device is already reset,
2584 * so ignore the status.
2586 if (hcd->driver->reset_device)
2587 hcd->driver->reset_device(hcd, udev);
2592 usb_clear_port_feature(hub->hdev,
2593 port1, USB_PORT_FEAT_C_RESET);
2594 if (hub_is_superspeed(hub->hdev)) {
2595 usb_clear_port_feature(hub->hdev, port1,
2596 USB_PORT_FEAT_C_BH_PORT_RESET);
2597 usb_clear_port_feature(hub->hdev, port1,
2598 USB_PORT_FEAT_C_PORT_LINK_STATE);
2599 usb_clear_port_feature(hub->hdev, port1,
2600 USB_PORT_FEAT_C_CONNECTION);
2603 usb_set_device_state(udev, *status
2604 ? USB_STATE_NOTATTACHED
2605 : USB_STATE_DEFAULT);
2610 /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
2611 static int hub_port_reset(struct usb_hub *hub, int port1,
2612 struct usb_device *udev, unsigned int delay, bool warm)
2615 u16 portchange, portstatus;
2617 if (!hub_is_superspeed(hub->hdev)) {
2619 dev_err(hub->intfdev, "only USB3 hub support "
2623 /* Block EHCI CF initialization during the port reset.
2624 * Some companion controllers don't like it when they mix.
2626 down_read(&ehci_cf_port_reset_rwsem);
2629 * If the caller hasn't explicitly requested a warm reset,
2630 * double check and see if one is needed.
2632 status = hub_port_status(hub, port1,
2633 &portstatus, &portchange);
2637 if (hub_port_warm_reset_required(hub, portstatus))
2641 /* Reset the port */
2642 for (i = 0; i < PORT_RESET_TRIES; i++) {
2643 status = set_port_feature(hub->hdev, port1, (warm ?
2644 USB_PORT_FEAT_BH_PORT_RESET :
2645 USB_PORT_FEAT_RESET));
2646 if (status == -ENODEV) {
2647 ; /* The hub is gone */
2648 } else if (status) {
2649 dev_err(hub->intfdev,
2650 "cannot %sreset port %d (err = %d)\n",
2651 warm ? "warm " : "", port1, status);
2653 status = hub_port_wait_reset(hub, port1, udev, delay,
2655 if (status && status != -ENOTCONN && status != -ENODEV)
2656 dev_dbg(hub->intfdev,
2657 "port_wait_reset: err = %d\n",
2661 /* Check for disconnect or reset */
2662 if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
2663 hub_port_finish_reset(hub, port1, udev, &status);
2665 if (!hub_is_superspeed(hub->hdev))
2669 * If a USB 3.0 device migrates from reset to an error
2670 * state, re-issue the warm reset.
2672 if (hub_port_status(hub, port1,
2673 &portstatus, &portchange) < 0)
2676 if (!hub_port_warm_reset_required(hub, portstatus))
2680 * If the port is in SS.Inactive or Compliance Mode, the
2681 * hot or warm reset failed. Try another warm reset.
2684 dev_dbg(hub->intfdev, "hot reset failed, warm reset port %d\n",
2690 dev_dbg (hub->intfdev,
2691 "port %d not enabled, trying %sreset again...\n",
2692 port1, warm ? "warm " : "");
2693 delay = HUB_LONG_RESET_TIME;
2696 dev_err (hub->intfdev,
2697 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2701 if (!hub_is_superspeed(hub->hdev))
2702 up_read(&ehci_cf_port_reset_rwsem);
2707 /* Check if a port is power on */
2708 static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
2712 if (hub_is_superspeed(hub->hdev)) {
2713 if (portstatus & USB_SS_PORT_STAT_POWER)
2716 if (portstatus & USB_PORT_STAT_POWER)
2725 /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
2726 static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
2730 if (hub_is_superspeed(hub->hdev)) {
2731 if ((portstatus & USB_PORT_STAT_LINK_STATE)
2732 == USB_SS_PORT_LS_U3)
2735 if (portstatus & USB_PORT_STAT_SUSPEND)
2742 /* Determine whether the device on a port is ready for a normal resume,
2743 * is ready for a reset-resume, or should be disconnected.
2745 static int check_port_resume_type(struct usb_device *udev,
2746 struct usb_hub *hub, int port1,
2747 int status, unsigned portchange, unsigned portstatus)
2749 /* Is the device still present? */
2750 if (status || port_is_suspended(hub, portstatus) ||
2751 !port_is_power_on(hub, portstatus) ||
2752 !(portstatus & USB_PORT_STAT_CONNECTION)) {
2757 /* Can't do a normal resume if the port isn't enabled,
2758 * so try a reset-resume instead.
2760 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
2761 if (udev->persist_enabled)
2762 udev->reset_resume = 1;
2768 dev_dbg(hub->intfdev,
2769 "port %d status %04x.%04x after resume, %d\n",
2770 port1, portchange, portstatus, status);
2771 } else if (udev->reset_resume) {
2773 /* Late port handoff can set status-change bits */
2774 if (portchange & USB_PORT_STAT_C_CONNECTION)
2775 usb_clear_port_feature(hub->hdev, port1,
2776 USB_PORT_FEAT_C_CONNECTION);
2777 if (portchange & USB_PORT_STAT_C_ENABLE)
2778 usb_clear_port_feature(hub->hdev, port1,
2779 USB_PORT_FEAT_C_ENABLE);
2785 int usb_disable_ltm(struct usb_device *udev)
2787 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2789 /* Check if the roothub and device supports LTM. */
2790 if (!usb_device_supports_ltm(hcd->self.root_hub) ||
2791 !usb_device_supports_ltm(udev))
2794 /* Clear Feature LTM Enable can only be sent if the device is
2797 if (!udev->actconfig)
2800 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2801 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
2802 USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
2803 USB_CTRL_SET_TIMEOUT);
2805 EXPORT_SYMBOL_GPL(usb_disable_ltm);
2807 void usb_enable_ltm(struct usb_device *udev)
2809 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2811 /* Check if the roothub and device supports LTM. */
2812 if (!usb_device_supports_ltm(hcd->self.root_hub) ||
2813 !usb_device_supports_ltm(udev))
2816 /* Set Feature LTM Enable can only be sent if the device is
2819 if (!udev->actconfig)
2822 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2823 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
2824 USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
2825 USB_CTRL_SET_TIMEOUT);
2827 EXPORT_SYMBOL_GPL(usb_enable_ltm);
2831 * usb_disable_function_remotewakeup - disable usb3.0
2832 * device's function remote wakeup
2833 * @udev: target device
2835 * Assume there's only one function on the USB 3.0
2836 * device and disable remote wake for the first
2837 * interface. FIXME if the interface association
2838 * descriptor shows there's more than one function.
2840 static int usb_disable_function_remotewakeup(struct usb_device *udev)
2842 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2843 USB_REQ_CLEAR_FEATURE, USB_RECIP_INTERFACE,
2844 USB_INTRF_FUNC_SUSPEND, 0, NULL, 0,
2845 USB_CTRL_SET_TIMEOUT);
2848 /* Count of wakeup-enabled devices at or below udev */
2849 static unsigned wakeup_enabled_descendants(struct usb_device *udev)
2851 struct usb_hub *hub = usb_hub_to_struct_hub(udev);
2853 return udev->do_remote_wakeup +
2854 (hub ? hub->wakeup_enabled_descendants : 0);
2858 * usb_port_suspend - suspend a usb device's upstream port
2859 * @udev: device that's no longer in active use, not a root hub
2860 * Context: must be able to sleep; device not locked; pm locks held
2862 * Suspends a USB device that isn't in active use, conserving power.
2863 * Devices may wake out of a suspend, if anything important happens,
2864 * using the remote wakeup mechanism. They may also be taken out of
2865 * suspend by the host, using usb_port_resume(). It's also routine
2866 * to disconnect devices while they are suspended.
2868 * This only affects the USB hardware for a device; its interfaces
2869 * (and, for hubs, child devices) must already have been suspended.
2871 * Selective port suspend reduces power; most suspended devices draw
2872 * less than 500 uA. It's also used in OTG, along with remote wakeup.
2873 * All devices below the suspended port are also suspended.
2875 * Devices leave suspend state when the host wakes them up. Some devices
2876 * also support "remote wakeup", where the device can activate the USB
2877 * tree above them to deliver data, such as a keypress or packet. In
2878 * some cases, this wakes the USB host.
2880 * Suspending OTG devices may trigger HNP, if that's been enabled
2881 * between a pair of dual-role devices. That will change roles, such
2882 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2884 * Devices on USB hub ports have only one "suspend" state, corresponding
2885 * to ACPI D2, "may cause the device to lose some context".
2886 * State transitions include:
2888 * - suspend, resume ... when the VBUS power link stays live
2889 * - suspend, disconnect ... VBUS lost
2891 * Once VBUS drop breaks the circuit, the port it's using has to go through
2892 * normal re-enumeration procedures, starting with enabling VBUS power.
2893 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2894 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
2895 * timer, no SRP, no requests through sysfs.
2897 * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get
2898 * suspended until their bus goes into global suspend (i.e., the root
2899 * hub is suspended). Nevertheless, we change @udev->state to
2900 * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual
2901 * upstream port setting is stored in @udev->port_is_suspended.
2903 * Returns 0 on success, else negative errno.
2905 int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
2907 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
2908 struct usb_port *port_dev = hub->ports[udev->portnum - 1];
2909 int port1 = udev->portnum;
2911 bool really_suspend = true;
2913 /* enable remote wakeup when appropriate; this lets the device
2914 * wake up the upstream hub (including maybe the root hub).
2916 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
2917 * we don't explicitly enable it here.
2919 if (udev->do_remote_wakeup) {
2920 if (!hub_is_superspeed(hub->hdev)) {
2921 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2922 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
2923 USB_DEVICE_REMOTE_WAKEUP, 0,
2925 USB_CTRL_SET_TIMEOUT);
2927 /* Assume there's only one function on the USB 3.0
2928 * device and enable remote wake for the first
2929 * interface. FIXME if the interface association
2930 * descriptor shows there's more than one function.
2932 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2933 USB_REQ_SET_FEATURE,
2934 USB_RECIP_INTERFACE,
2935 USB_INTRF_FUNC_SUSPEND,
2936 USB_INTRF_FUNC_SUSPEND_RW |
2937 USB_INTRF_FUNC_SUSPEND_LP,
2939 USB_CTRL_SET_TIMEOUT);
2942 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
2944 /* bail if autosuspend is requested */
2945 if (PMSG_IS_AUTO(msg))
2950 /* disable USB2 hardware LPM */
2951 if (udev->usb2_hw_lpm_enabled == 1)
2952 usb_set_usb2_hardware_lpm(udev, 0);
2954 if (usb_disable_ltm(udev)) {
2955 dev_err(&udev->dev, "Failed to disable LTM before suspend\n.");
2957 if (PMSG_IS_AUTO(msg))
2960 if (usb_unlocked_disable_lpm(udev)) {
2961 dev_err(&udev->dev, "Failed to disable LPM before suspend\n.");
2963 if (PMSG_IS_AUTO(msg))
2968 if (hub_is_superspeed(hub->hdev))
2969 status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3);
2972 * For system suspend, we do not need to enable the suspend feature
2973 * on individual USB-2 ports. The devices will automatically go
2974 * into suspend a few ms after the root hub stops sending packets.
2975 * The USB 2.0 spec calls this "global suspend".
2977 * However, many USB hubs have a bug: They don't relay wakeup requests
2978 * from a downstream port if the port's suspend feature isn't on.
2979 * Therefore we will turn on the suspend feature if udev or any of its
2980 * descendants is enabled for remote wakeup.
2982 else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0)
2983 status = set_port_feature(hub->hdev, port1,
2984 USB_PORT_FEAT_SUSPEND);
2986 really_suspend = false;
2990 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
2993 /* Try to enable USB3 LPM and LTM again */
2994 usb_unlocked_enable_lpm(udev);
2996 usb_enable_ltm(udev);
2998 /* Try to enable USB2 hardware LPM again */
2999 if (udev->usb2_hw_lpm_capable == 1)
3000 usb_set_usb2_hardware_lpm(udev, 1);
3002 if (udev->do_remote_wakeup) {
3003 if (udev->speed < USB_SPEED_SUPER)
3004 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3005 USB_REQ_CLEAR_FEATURE,
3007 USB_DEVICE_REMOTE_WAKEUP, 0,
3008 NULL, 0, USB_CTRL_SET_TIMEOUT);
3010 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3011 USB_REQ_CLEAR_FEATURE,
3012 USB_RECIP_INTERFACE,
3013 USB_INTRF_FUNC_SUSPEND, 0,
3014 NULL, 0, USB_CTRL_SET_TIMEOUT);
3018 /* System sleep transitions should never fail */
3019 if (!PMSG_IS_AUTO(msg))
3022 dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
3023 (PMSG_IS_AUTO(msg) ? "auto-" : ""),
3024 udev->do_remote_wakeup);
3025 if (really_suspend) {
3026 udev->port_is_suspended = 1;
3028 /* device has up to 10 msec to fully suspend */
3031 usb_set_device_state(udev, USB_STATE_SUSPENDED);
3034 if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled) {
3035 pm_runtime_put_sync(&port_dev->dev);
3036 port_dev->did_runtime_put = true;
3039 usb_mark_last_busy(hub->hdev);
3044 * If the USB "suspend" state is in use (rather than "global suspend"),
3045 * many devices will be individually taken out of suspend state using
3046 * special "resume" signaling. This routine kicks in shortly after
3047 * hardware resume signaling is finished, either because of selective
3048 * resume (by host) or remote wakeup (by device) ... now see what changed
3049 * in the tree that's rooted at this device.
3051 * If @udev->reset_resume is set then the device is reset before the
3052 * status check is done.
3054 static int finish_port_resume(struct usb_device *udev)
3059 /* caller owns the udev device lock */
3060 dev_dbg(&udev->dev, "%s\n",
3061 udev->reset_resume ? "finish reset-resume" : "finish resume");
3063 /* usb ch9 identifies four variants of SUSPENDED, based on what
3064 * state the device resumes to. Linux currently won't see the
3065 * first two on the host side; they'd be inside hub_port_init()
3066 * during many timeouts, but khubd can't suspend until later.
3068 usb_set_device_state(udev, udev->actconfig
3069 ? USB_STATE_CONFIGURED
3070 : USB_STATE_ADDRESS);
3072 /* 10.5.4.5 says not to reset a suspended port if the attached
3073 * device is enabled for remote wakeup. Hence the reset
3074 * operation is carried out here, after the port has been
3077 if (udev->reset_resume)
3079 status = usb_reset_and_verify_device(udev);
3081 /* 10.5.4.5 says be sure devices in the tree are still there.
3082 * For now let's assume the device didn't go crazy on resume,
3083 * and device drivers will know about any resume quirks.
3087 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
3089 status = (status > 0 ? 0 : -ENODEV);
3091 /* If a normal resume failed, try doing a reset-resume */
3092 if (status && !udev->reset_resume && udev->persist_enabled) {
3093 dev_dbg(&udev->dev, "retry with reset-resume\n");
3094 udev->reset_resume = 1;
3095 goto retry_reset_resume;
3100 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
3103 * There are a few quirky devices which violate the standard
3104 * by claiming to have remote wakeup enabled after a reset,
3105 * which crash if the feature is cleared, hence check for
3106 * udev->reset_resume
3108 } else if (udev->actconfig && !udev->reset_resume) {
3109 if (!hub_is_superspeed(udev->parent)) {
3110 le16_to_cpus(&devstatus);
3111 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
3112 status = usb_control_msg(udev,
3113 usb_sndctrlpipe(udev, 0),
3114 USB_REQ_CLEAR_FEATURE,
3116 USB_DEVICE_REMOTE_WAKEUP, 0,
3118 USB_CTRL_SET_TIMEOUT);
3120 status = usb_get_status(udev, USB_RECIP_INTERFACE, 0,
3122 le16_to_cpus(&devstatus);
3123 if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP
3124 | USB_INTRF_STAT_FUNC_RW))
3126 usb_disable_function_remotewakeup(udev);
3131 "disable remote wakeup, status %d\n",
3139 * usb_port_resume - re-activate a suspended usb device's upstream port
3140 * @udev: device to re-activate, not a root hub
3141 * Context: must be able to sleep; device not locked; pm locks held
3143 * This will re-activate the suspended device, increasing power usage
3144 * while letting drivers communicate again with its endpoints.
3145 * USB resume explicitly guarantees that the power session between
3146 * the host and the device is the same as it was when the device
3149 * If @udev->reset_resume is set then this routine won't check that the
3150 * port is still enabled. Furthermore, finish_port_resume() above will
3151 * reset @udev. The end result is that a broken power session can be
3152 * recovered and @udev will appear to persist across a loss of VBUS power.
3154 * For example, if a host controller doesn't maintain VBUS suspend current
3155 * during a system sleep or is reset when the system wakes up, all the USB
3156 * power sessions below it will be broken. This is especially troublesome
3157 * for mass-storage devices containing mounted filesystems, since the
3158 * device will appear to have disconnected and all the memory mappings
3159 * to it will be lost. Using the USB_PERSIST facility, the device can be
3160 * made to appear as if it had not disconnected.
3162 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
3163 * every effort to insure that the same device is present after the
3164 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
3165 * quite possible for a device to remain unaltered but its media to be
3166 * changed. If the user replaces a flash memory card while the system is
3167 * asleep, he will have only himself to blame when the filesystem on the
3168 * new card is corrupted and the system crashes.
3170 * Returns 0 on success, else negative errno.
3172 int usb_port_resume(struct usb_device *udev, pm_message_t msg)
3174 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
3175 struct usb_port *port_dev = hub->ports[udev->portnum - 1];
3176 int port1 = udev->portnum;
3178 u16 portchange, portstatus;
3180 if (port_dev->did_runtime_put) {
3181 status = pm_runtime_get_sync(&port_dev->dev);
3182 port_dev->did_runtime_put = false;
3184 dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
3190 /* Skip the initial Clear-Suspend step for a remote wakeup */
3191 status = hub_port_status(hub, port1, &portstatus, &portchange);
3192 if (status == 0 && !port_is_suspended(hub, portstatus))
3193 goto SuspendCleared;
3195 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
3197 set_bit(port1, hub->busy_bits);
3199 /* see 7.1.7.7; affects power usage, but not budgeting */
3200 if (hub_is_superspeed(hub->hdev))
3201 status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0);
3203 status = usb_clear_port_feature(hub->hdev,
3204 port1, USB_PORT_FEAT_SUSPEND);
3206 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
3209 /* drive resume for at least 20 msec */
3210 dev_dbg(&udev->dev, "usb %sresume\n",
3211 (PMSG_IS_AUTO(msg) ? "auto-" : ""));
3214 /* Virtual root hubs can trigger on GET_PORT_STATUS to
3215 * stop resume signaling. Then finish the resume
3218 status = hub_port_status(hub, port1, &portstatus, &portchange);
3220 /* TRSMRCY = 10 msec */
3226 udev->port_is_suspended = 0;
3227 if (hub_is_superspeed(hub->hdev)) {
3228 if (portchange & USB_PORT_STAT_C_LINK_STATE)
3229 usb_clear_port_feature(hub->hdev, port1,
3230 USB_PORT_FEAT_C_PORT_LINK_STATE);
3232 if (portchange & USB_PORT_STAT_C_SUSPEND)
3233 usb_clear_port_feature(hub->hdev, port1,
3234 USB_PORT_FEAT_C_SUSPEND);
3238 clear_bit(port1, hub->busy_bits);
3240 status = check_port_resume_type(udev,
3241 hub, port1, status, portchange, portstatus);
3243 status = finish_port_resume(udev);
3245 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
3246 hub_port_logical_disconnect(hub, port1);
3248 /* Try to enable USB2 hardware LPM */
3249 if (udev->usb2_hw_lpm_capable == 1)
3250 usb_set_usb2_hardware_lpm(udev, 1);
3252 /* Try to enable USB3 LTM and LPM */
3253 usb_enable_ltm(udev);
3254 usb_unlocked_enable_lpm(udev);
3260 #endif /* CONFIG_PM */
3262 #ifdef CONFIG_PM_RUNTIME
3264 /* caller has locked udev */
3265 int usb_remote_wakeup(struct usb_device *udev)
3269 if (udev->state == USB_STATE_SUSPENDED) {
3270 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
3271 status = usb_autoresume_device(udev);
3273 /* Let the drivers do their thing, then... */
3274 usb_autosuspend_device(udev);
3282 static int check_ports_changed(struct usb_hub *hub)
3286 for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) {
3287 u16 portstatus, portchange;
3290 status = hub_port_status(hub, port1, &portstatus, &portchange);
3291 if (!status && portchange)
3297 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
3299 struct usb_hub *hub = usb_get_intfdata (intf);
3300 struct usb_device *hdev = hub->hdev;
3305 * Warn if children aren't already suspended.
3306 * Also, add up the number of wakeup-enabled descendants.
3308 hub->wakeup_enabled_descendants = 0;
3309 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
3310 struct usb_device *udev;
3312 udev = hub->ports[port1 - 1]->child;
3313 if (udev && udev->can_submit) {
3314 dev_warn(&intf->dev, "port %d nyet suspended\n", port1);
3315 if (PMSG_IS_AUTO(msg))
3319 hub->wakeup_enabled_descendants +=
3320 wakeup_enabled_descendants(udev);
3323 if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) {
3324 /* check if there are changes pending on hub ports */
3325 if (check_ports_changed(hub)) {
3326 if (PMSG_IS_AUTO(msg))
3328 pm_wakeup_event(&hdev->dev, 2000);
3332 if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
3333 /* Enable hub to send remote wakeup for all ports. */
3334 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
3335 status = set_port_feature(hdev,
3337 USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
3338 USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
3339 USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
3340 USB_PORT_FEAT_REMOTE_WAKE_MASK);
3344 dev_dbg(&intf->dev, "%s\n", __func__);
3346 /* stop khubd and related activity */
3347 hub_quiesce(hub, HUB_SUSPEND);
3351 static int hub_resume(struct usb_interface *intf)
3353 struct usb_hub *hub = usb_get_intfdata(intf);
3355 dev_dbg(&intf->dev, "%s\n", __func__);
3356 hub_activate(hub, HUB_RESUME);
3360 static int hub_reset_resume(struct usb_interface *intf)
3362 struct usb_hub *hub = usb_get_intfdata(intf);
3364 dev_dbg(&intf->dev, "%s\n", __func__);
3365 hub_activate(hub, HUB_RESET_RESUME);
3370 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
3371 * @rhdev: struct usb_device for the root hub
3373 * The USB host controller driver calls this function when its root hub
3374 * is resumed and Vbus power has been interrupted or the controller
3375 * has been reset. The routine marks @rhdev as having lost power.
3376 * When the hub driver is resumed it will take notice and carry out
3377 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
3378 * the others will be disconnected.
3380 void usb_root_hub_lost_power(struct usb_device *rhdev)
3382 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
3383 rhdev->reset_resume = 1;
3385 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
3387 static const char * const usb3_lpm_names[] = {
3395 * Send a Set SEL control transfer to the device, prior to enabling
3396 * device-initiated U1 or U2. This lets the device know the exit latencies from
3397 * the time the device initiates a U1 or U2 exit, to the time it will receive a
3398 * packet from the host.
3400 * This function will fail if the SEL or PEL values for udev are greater than
3401 * the maximum allowed values for the link state to be enabled.
3403 static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state)
3405 struct usb_set_sel_req *sel_values;
3406 unsigned long long u1_sel;
3407 unsigned long long u1_pel;
3408 unsigned long long u2_sel;
3409 unsigned long long u2_pel;
3412 /* Convert SEL and PEL stored in ns to us */
3413 u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
3414 u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
3415 u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
3416 u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);
3419 * Make sure that the calculated SEL and PEL values for the link
3420 * state we're enabling aren't bigger than the max SEL/PEL
3421 * value that will fit in the SET SEL control transfer.
3422 * Otherwise the device would get an incorrect idea of the exit
3423 * latency for the link state, and could start a device-initiated
3424 * U1/U2 when the exit latencies are too high.
3426 if ((state == USB3_LPM_U1 &&
3427 (u1_sel > USB3_LPM_MAX_U1_SEL_PEL ||
3428 u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) ||
3429 (state == USB3_LPM_U2 &&
3430 (u2_sel > USB3_LPM_MAX_U2_SEL_PEL ||
3431 u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) {
3432 dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n",
3433 usb3_lpm_names[state], u1_sel, u1_pel);
3438 * If we're enabling device-initiated LPM for one link state,
3439 * but the other link state has a too high SEL or PEL value,
3440 * just set those values to the max in the Set SEL request.
3442 if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL)
3443 u1_sel = USB3_LPM_MAX_U1_SEL_PEL;
3445 if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL)
3446 u1_pel = USB3_LPM_MAX_U1_SEL_PEL;
3448 if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL)
3449 u2_sel = USB3_LPM_MAX_U2_SEL_PEL;
3451 if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL)
3452 u2_pel = USB3_LPM_MAX_U2_SEL_PEL;
3455 * usb_enable_lpm() can be called as part of a failed device reset,
3456 * which may be initiated by an error path of a mass storage driver.
3457 * Therefore, use GFP_NOIO.
3459 sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO);
3463 sel_values->u1_sel = u1_sel;
3464 sel_values->u1_pel = u1_pel;
3465 sel_values->u2_sel = cpu_to_le16(u2_sel);
3466 sel_values->u2_pel = cpu_to_le16(u2_pel);
3468 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3472 sel_values, sizeof *(sel_values),
3473 USB_CTRL_SET_TIMEOUT);
3479 * Enable or disable device-initiated U1 or U2 transitions.
3481 static int usb_set_device_initiated_lpm(struct usb_device *udev,
3482 enum usb3_link_state state, bool enable)
3489 feature = USB_DEVICE_U1_ENABLE;
3492 feature = USB_DEVICE_U2_ENABLE;
3495 dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n",
3496 __func__, enable ? "enable" : "disable");
3500 if (udev->state != USB_STATE_CONFIGURED) {
3501 dev_dbg(&udev->dev, "%s: Can't %s %s state "
3502 "for unconfigured device.\n",
3503 __func__, enable ? "enable" : "disable",
3504 usb3_lpm_names[state]);
3510 * Now send the control transfer to enable device-initiated LPM
3511 * for either U1 or U2.
3513 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3514 USB_REQ_SET_FEATURE,
3518 USB_CTRL_SET_TIMEOUT);
3520 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3521 USB_REQ_CLEAR_FEATURE,
3525 USB_CTRL_SET_TIMEOUT);
3528 dev_warn(&udev->dev, "%s of device-initiated %s failed.\n",
3529 enable ? "Enable" : "Disable",
3530 usb3_lpm_names[state]);
3536 static int usb_set_lpm_timeout(struct usb_device *udev,
3537 enum usb3_link_state state, int timeout)
3544 feature = USB_PORT_FEAT_U1_TIMEOUT;
3547 feature = USB_PORT_FEAT_U2_TIMEOUT;
3550 dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n",
3555 if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT &&
3556 timeout != USB3_LPM_DEVICE_INITIATED) {
3557 dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, "
3558 "which is a reserved value.\n",
3559 usb3_lpm_names[state], timeout);
3563 ret = set_port_feature(udev->parent,
3564 USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum,
3567 dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x,"
3568 "error code %i\n", usb3_lpm_names[state],
3572 if (state == USB3_LPM_U1)
3573 udev->u1_params.timeout = timeout;
3575 udev->u2_params.timeout = timeout;
3580 * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
3583 * We will attempt to enable U1 or U2, but there are no guarantees that the
3584 * control transfers to set the hub timeout or enable device-initiated U1/U2
3585 * will be successful.
3587 * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
3588 * driver know about it. If that call fails, it should be harmless, and just
3589 * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
3591 static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
3592 enum usb3_link_state state)
3595 __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat;
3596 __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat;
3598 /* If the device says it doesn't have *any* exit latency to come out of
3599 * U1 or U2, it's probably lying. Assume it doesn't implement that link
3602 if ((state == USB3_LPM_U1 && u1_mel == 0) ||
3603 (state == USB3_LPM_U2 && u2_mel == 0))
3607 * First, let the device know about the exit latencies
3608 * associated with the link state we're about to enable.
3610 ret = usb_req_set_sel(udev, state);
3612 dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n",
3613 usb3_lpm_names[state]);
3617 /* We allow the host controller to set the U1/U2 timeout internally
3618 * first, so that it can change its schedule to account for the
3619 * additional latency to send data to a device in a lower power
3622 timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state);
3624 /* xHCI host controller doesn't want to enable this LPM state. */
3629 dev_warn(&udev->dev, "Could not enable %s link state, "
3630 "xHCI error %i.\n", usb3_lpm_names[state],
3635 if (usb_set_lpm_timeout(udev, state, timeout))
3636 /* If we can't set the parent hub U1/U2 timeout,
3637 * device-initiated LPM won't be allowed either, so let the xHCI
3638 * host know that this link state won't be enabled.
3640 hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
3642 /* Only a configured device will accept the Set Feature U1/U2_ENABLE */
3643 else if (udev->actconfig)
3644 usb_set_device_initiated_lpm(udev, state, true);
3649 * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
3652 * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
3653 * If zero is returned, the parent will not allow the link to go into U1/U2.
3655 * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
3656 * it won't have an effect on the bus link state because the parent hub will
3657 * still disallow device-initiated U1/U2 entry.
3659 * If zero is returned, the xHCI host controller may still think U1/U2 entry is
3660 * possible. The result will be slightly more bus bandwidth will be taken up
3661 * (to account for U1/U2 exit latency), but it should be harmless.
3663 static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
3664 enum usb3_link_state state)
3670 feature = USB_PORT_FEAT_U1_TIMEOUT;
3673 feature = USB_PORT_FEAT_U2_TIMEOUT;
3676 dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n",
3681 if (usb_set_lpm_timeout(udev, state, 0))
3684 usb_set_device_initiated_lpm(udev, state, false);
3686 if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state))
3687 dev_warn(&udev->dev, "Could not disable xHCI %s timeout, "
3688 "bus schedule bandwidth may be impacted.\n",
3689 usb3_lpm_names[state]);
3694 * Disable hub-initiated and device-initiated U1 and U2 entry.
3695 * Caller must own the bandwidth_mutex.
3697 * This will call usb_enable_lpm() on failure, which will decrement
3698 * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
3700 int usb_disable_lpm(struct usb_device *udev)
3702 struct usb_hcd *hcd;
3704 if (!udev || !udev->parent ||
3705 udev->speed != USB_SPEED_SUPER ||
3709 hcd = bus_to_hcd(udev->bus);
3710 if (!hcd || !hcd->driver->disable_usb3_lpm_timeout)
3713 udev->lpm_disable_count++;
3714 if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0))
3717 /* If LPM is enabled, attempt to disable it. */
3718 if (usb_disable_link_state(hcd, udev, USB3_LPM_U1))
3720 if (usb_disable_link_state(hcd, udev, USB3_LPM_U2))
3726 usb_enable_lpm(udev);
3729 EXPORT_SYMBOL_GPL(usb_disable_lpm);
3731 /* Grab the bandwidth_mutex before calling usb_disable_lpm() */
3732 int usb_unlocked_disable_lpm(struct usb_device *udev)
3734 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
3740 mutex_lock(hcd->bandwidth_mutex);
3741 ret = usb_disable_lpm(udev);
3742 mutex_unlock(hcd->bandwidth_mutex);
3746 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
3749 * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
3750 * xHCI host policy may prevent U1 or U2 from being enabled.
3752 * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
3753 * until the lpm_disable_count drops to zero. Caller must own the
3756 void usb_enable_lpm(struct usb_device *udev)
3758 struct usb_hcd *hcd;
3760 if (!udev || !udev->parent ||
3761 udev->speed != USB_SPEED_SUPER ||
3765 udev->lpm_disable_count--;
3766 hcd = bus_to_hcd(udev->bus);
3767 /* Double check that we can both enable and disable LPM.
3768 * Device must be configured to accept set feature U1/U2 timeout.
3770 if (!hcd || !hcd->driver->enable_usb3_lpm_timeout ||
3771 !hcd->driver->disable_usb3_lpm_timeout)
3774 if (udev->lpm_disable_count > 0)
3777 usb_enable_link_state(hcd, udev, USB3_LPM_U1);
3778 usb_enable_link_state(hcd, udev, USB3_LPM_U2);
3780 EXPORT_SYMBOL_GPL(usb_enable_lpm);
3782 /* Grab the bandwidth_mutex before calling usb_enable_lpm() */
3783 void usb_unlocked_enable_lpm(struct usb_device *udev)
3785 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
3790 mutex_lock(hcd->bandwidth_mutex);
3791 usb_enable_lpm(udev);
3792 mutex_unlock(hcd->bandwidth_mutex);
3794 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
3797 #else /* CONFIG_PM */
3799 #define hub_suspend NULL
3800 #define hub_resume NULL
3801 #define hub_reset_resume NULL
3803 int usb_disable_lpm(struct usb_device *udev)
3807 EXPORT_SYMBOL_GPL(usb_disable_lpm);
3809 void usb_enable_lpm(struct usb_device *udev) { }
3810 EXPORT_SYMBOL_GPL(usb_enable_lpm);
3812 int usb_unlocked_disable_lpm(struct usb_device *udev)
3816 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
3818 void usb_unlocked_enable_lpm(struct usb_device *udev) { }
3819 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
3821 int usb_disable_ltm(struct usb_device *udev)
3825 EXPORT_SYMBOL_GPL(usb_disable_ltm);
3827 void usb_enable_ltm(struct usb_device *udev) { }
3828 EXPORT_SYMBOL_GPL(usb_enable_ltm);
3832 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
3834 * Between connect detection and reset signaling there must be a delay
3835 * of 100ms at least for debounce and power-settling. The corresponding
3836 * timer shall restart whenever the downstream port detects a disconnect.
3838 * Apparently there are some bluetooth and irda-dongles and a number of
3839 * low-speed devices for which this debounce period may last over a second.
3840 * Not covered by the spec - but easy to deal with.
3842 * This implementation uses a 1500ms total debounce timeout; if the
3843 * connection isn't stable by then it returns -ETIMEDOUT. It checks
3844 * every 25ms for transient disconnects. When the port status has been
3845 * unchanged for 100ms it returns the port status.
3847 int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected)
3850 int total_time, stable_time = 0;
3851 u16 portchange, portstatus;
3852 unsigned connection = 0xffff;
3854 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
3855 ret = hub_port_status(hub, port1, &portstatus, &portchange);
3859 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
3860 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
3861 if (!must_be_connected ||
3862 (connection == USB_PORT_STAT_CONNECTION))
3863 stable_time += HUB_DEBOUNCE_STEP;
3864 if (stable_time >= HUB_DEBOUNCE_STABLE)
3868 connection = portstatus & USB_PORT_STAT_CONNECTION;
3871 if (portchange & USB_PORT_STAT_C_CONNECTION) {
3872 usb_clear_port_feature(hub->hdev, port1,
3873 USB_PORT_FEAT_C_CONNECTION);
3876 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
3878 msleep(HUB_DEBOUNCE_STEP);
3881 dev_dbg (hub->intfdev,
3882 "debounce: port %d: total %dms stable %dms status 0x%x\n",
3883 port1, total_time, stable_time, portstatus);
3885 if (stable_time < HUB_DEBOUNCE_STABLE)
3890 void usb_ep0_reinit(struct usb_device *udev)
3892 usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
3893 usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
3894 usb_enable_endpoint(udev, &udev->ep0, true);
3896 EXPORT_SYMBOL_GPL(usb_ep0_reinit);
3898 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
3899 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
3901 static int hub_set_address(struct usb_device *udev, int devnum)
3904 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
3907 * The host controller will choose the device address,
3908 * instead of the core having chosen it earlier
3910 if (!hcd->driver->address_device && devnum <= 1)
3912 if (udev->state == USB_STATE_ADDRESS)
3914 if (udev->state != USB_STATE_DEFAULT)
3916 if (hcd->driver->address_device)
3917 retval = hcd->driver->address_device(hcd, udev);
3919 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
3920 USB_REQ_SET_ADDRESS, 0, devnum, 0,
3921 NULL, 0, USB_CTRL_SET_TIMEOUT);
3923 update_devnum(udev, devnum);
3924 /* Device now using proper address. */
3925 usb_set_device_state(udev, USB_STATE_ADDRESS);
3926 usb_ep0_reinit(udev);
3931 /* Reset device, (re)assign address, get device descriptor.
3932 * Device connection must be stable, no more debouncing needed.
3933 * Returns device in USB_STATE_ADDRESS, except on error.
3935 * If this is called for an already-existing device (as part of
3936 * usb_reset_and_verify_device), the caller must own the device lock. For a
3937 * newly detected device that is not accessible through any global
3938 * pointers, it's not necessary to lock the device.
3941 hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
3944 static DEFINE_MUTEX(usb_address0_mutex);
3946 struct usb_device *hdev = hub->hdev;
3947 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
3949 unsigned delay = HUB_SHORT_RESET_TIME;
3950 enum usb_device_speed oldspeed = udev->speed;
3952 int devnum = udev->devnum;
3954 /* root hub ports have a slightly longer reset period
3955 * (from USB 2.0 spec, section 7.1.7.5)
3957 if (!hdev->parent) {
3958 delay = HUB_ROOT_RESET_TIME;
3959 if (port1 == hdev->bus->otg_port)
3960 hdev->bus->b_hnp_enable = 0;
3963 /* Some low speed devices have problems with the quick delay, so */
3964 /* be a bit pessimistic with those devices. RHbug #23670 */
3965 if (oldspeed == USB_SPEED_LOW)
3966 delay = HUB_LONG_RESET_TIME;
3968 mutex_lock(&usb_address0_mutex);
3970 /* Reset the device; full speed may morph to high speed */
3971 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
3972 retval = hub_port_reset(hub, port1, udev, delay, false);
3973 if (retval < 0) /* error or disconnect */
3975 /* success, speed is known */
3979 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
3980 dev_dbg(&udev->dev, "device reset changed speed!\n");
3983 oldspeed = udev->speed;
3985 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
3986 * it's fixed size except for full speed devices.
3987 * For Wireless USB devices, ep0 max packet is always 512 (tho
3988 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
3990 switch (udev->speed) {
3991 case USB_SPEED_SUPER:
3992 case USB_SPEED_WIRELESS: /* fixed at 512 */
3993 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
3995 case USB_SPEED_HIGH: /* fixed at 64 */
3996 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
3998 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
3999 /* to determine the ep0 maxpacket size, try to read
4000 * the device descriptor to get bMaxPacketSize0 and
4001 * then correct our initial guess.
4003 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
4005 case USB_SPEED_LOW: /* fixed at 8 */
4006 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
4012 if (udev->speed == USB_SPEED_WIRELESS)
4013 speed = "variable speed Wireless";
4015 speed = usb_speed_string(udev->speed);
4017 if (udev->speed != USB_SPEED_SUPER)
4018 dev_info(&udev->dev,
4019 "%s %s USB device number %d using %s\n",
4020 (udev->config) ? "reset" : "new", speed,
4021 devnum, udev->bus->controller->driver->name);
4023 /* Set up TT records, if needed */
4025 udev->tt = hdev->tt;
4026 udev->ttport = hdev->ttport;
4027 } else if (udev->speed != USB_SPEED_HIGH
4028 && hdev->speed == USB_SPEED_HIGH) {
4030 dev_err(&udev->dev, "parent hub has no TT\n");
4034 udev->tt = &hub->tt;
4035 udev->ttport = port1;
4038 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
4039 * Because device hardware and firmware is sometimes buggy in
4040 * this area, and this is how Linux has done it for ages.
4041 * Change it cautiously.
4043 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
4044 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
4045 * so it may help with some non-standards-compliant devices.
4046 * Otherwise we start with SET_ADDRESS and then try to read the
4047 * first 8 bytes of the device descriptor to get the ep0 maxpacket
4050 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
4051 if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3)) {
4052 struct usb_device_descriptor *buf;
4055 #define GET_DESCRIPTOR_BUFSIZE 64
4056 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
4062 /* Retry on all errors; some devices are flakey.
4063 * 255 is for WUSB devices, we actually need to use
4064 * 512 (WUSB1.0[4.8.1]).
4066 for (j = 0; j < 3; ++j) {
4067 buf->bMaxPacketSize0 = 0;
4068 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
4069 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
4070 USB_DT_DEVICE << 8, 0,
4071 buf, GET_DESCRIPTOR_BUFSIZE,
4072 initial_descriptor_timeout);
4073 switch (buf->bMaxPacketSize0) {
4074 case 8: case 16: case 32: case 64: case 255:
4075 if (buf->bDescriptorType ==
4089 udev->descriptor.bMaxPacketSize0 =
4090 buf->bMaxPacketSize0;
4093 retval = hub_port_reset(hub, port1, udev, delay, false);
4094 if (retval < 0) /* error or disconnect */
4096 if (oldspeed != udev->speed) {
4098 "device reset changed speed!\n");
4104 dev_err(&udev->dev, "device descriptor read/64, error %d\n",
4109 #undef GET_DESCRIPTOR_BUFSIZE
4113 * If device is WUSB, we already assigned an
4114 * unauthorized address in the Connect Ack sequence;
4115 * authorization will assign the final address.
4117 if (udev->wusb == 0) {
4118 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
4119 retval = hub_set_address(udev, devnum);
4125 if (retval != -ENODEV)
4126 dev_err(&udev->dev, "device not accepting address %d, error %d\n",
4130 if (udev->speed == USB_SPEED_SUPER) {
4131 devnum = udev->devnum;
4132 dev_info(&udev->dev,
4133 "%s SuperSpeed USB device number %d using %s\n",
4134 (udev->config) ? "reset" : "new",
4135 devnum, udev->bus->controller->driver->name);
4138 /* cope with hardware quirkiness:
4139 * - let SET_ADDRESS settle, some device hardware wants it
4140 * - read ep0 maxpacket even for high and low speed,
4143 if (USE_NEW_SCHEME(retry_counter) && !(hcd->driver->flags & HCD_USB3))
4147 retval = usb_get_device_descriptor(udev, 8);
4149 if (retval != -ENODEV)
4151 "device descriptor read/8, error %d\n",
4163 if (hcd->phy && !hdev->parent)
4164 usb_phy_notify_connect(hcd->phy, udev->speed);
4167 * Some superspeed devices have finished the link training process
4168 * and attached to a superspeed hub port, but the device descriptor
4169 * got from those devices show they aren't superspeed devices. Warm
4170 * reset the port attached by the devices can fix them.
4172 if ((udev->speed == USB_SPEED_SUPER) &&
4173 (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
4174 dev_err(&udev->dev, "got a wrong device descriptor, "
4175 "warm reset device\n");
4176 hub_port_reset(hub, port1, udev,
4177 HUB_BH_RESET_TIME, true);
4182 if (udev->descriptor.bMaxPacketSize0 == 0xff ||
4183 udev->speed == USB_SPEED_SUPER)
4186 i = udev->descriptor.bMaxPacketSize0;
4187 if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
4188 if (udev->speed == USB_SPEED_LOW ||
4189 !(i == 8 || i == 16 || i == 32 || i == 64)) {
4190 dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
4194 if (udev->speed == USB_SPEED_FULL)
4195 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
4197 dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
4198 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
4199 usb_ep0_reinit(udev);
4202 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
4203 if (retval < (signed)sizeof(udev->descriptor)) {
4204 if (retval != -ENODEV)
4205 dev_err(&udev->dev, "device descriptor read/all, error %d\n",
4212 if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
4213 retval = usb_get_bos_descriptor(udev);
4215 udev->lpm_capable = usb_device_supports_lpm(udev);
4216 usb_set_lpm_parameters(udev);
4221 /* notify HCD that we have a device connected and addressed */
4222 if (hcd->driver->update_device)
4223 hcd->driver->update_device(hcd, udev);
4226 hub_port_disable(hub, port1, 0);
4227 update_devnum(udev, devnum); /* for disconnect processing */
4229 mutex_unlock(&usb_address0_mutex);
4234 check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
4236 struct usb_qualifier_descriptor *qual;
4239 qual = kmalloc (sizeof *qual, GFP_KERNEL);
4243 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
4244 qual, sizeof *qual);
4245 if (status == sizeof *qual) {
4246 dev_info(&udev->dev, "not running at top speed; "
4247 "connect to a high speed hub\n");
4248 /* hub LEDs are probably harder to miss than syslog */
4249 if (hub->has_indicators) {
4250 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
4251 schedule_delayed_work (&hub->leds, 0);
4258 hub_power_remaining (struct usb_hub *hub)
4260 struct usb_device *hdev = hub->hdev;
4264 if (!hub->limited_power)
4267 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
4268 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
4269 struct usb_device *udev = hub->ports[port1 - 1]->child;
4275 if (hub_is_superspeed(udev))
4281 * Unconfigured devices may not use more than one unit load,
4282 * or 8mA for OTG ports
4284 if (udev->actconfig)
4285 delta = usb_get_max_power(udev, udev->actconfig);
4286 else if (port1 != udev->bus->otg_port || hdev->parent)
4290 if (delta > hub->mA_per_port)
4291 dev_warn(&udev->dev,
4292 "%dmA is over %umA budget for port %d!\n",
4293 delta, hub->mA_per_port, port1);
4296 if (remaining < 0) {
4297 dev_warn(hub->intfdev, "%dmA over power budget!\n",
4304 /* Handle physical or logical connection change events.
4305 * This routine is called when:
4306 * a port connection-change occurs;
4307 * a port enable-change occurs (often caused by EMI);
4308 * usb_reset_and_verify_device() encounters changed descriptors (as from
4309 * a firmware download)
4310 * caller already locked the hub
4312 static void hub_port_connect_change(struct usb_hub *hub, int port1,
4313 u16 portstatus, u16 portchange)
4315 struct usb_device *hdev = hub->hdev;
4316 struct device *hub_dev = hub->intfdev;
4317 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
4318 unsigned wHubCharacteristics =
4319 le16_to_cpu(hub->descriptor->wHubCharacteristics);
4320 struct usb_device *udev;
4325 "port %d, status %04x, change %04x, %s\n",
4326 port1, portstatus, portchange, portspeed(hub, portstatus));
4328 if (hub->has_indicators) {
4329 set_port_led(hub, port1, HUB_LED_AUTO);
4330 hub->indicator[port1-1] = INDICATOR_AUTO;
4333 #ifdef CONFIG_USB_OTG
4334 /* during HNP, don't repeat the debounce */
4335 if (hdev->bus->is_b_host)
4336 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
4337 USB_PORT_STAT_C_ENABLE);
4340 /* Try to resuscitate an existing device */
4341 udev = hub->ports[port1 - 1]->child;
4342 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
4343 udev->state != USB_STATE_NOTATTACHED) {
4344 usb_lock_device(udev);
4345 if (portstatus & USB_PORT_STAT_ENABLE) {
4346 status = 0; /* Nothing to do */
4348 #ifdef CONFIG_PM_RUNTIME
4349 } else if (udev->state == USB_STATE_SUSPENDED &&
4350 udev->persist_enabled) {
4351 /* For a suspended device, treat this as a
4352 * remote wakeup event.
4354 status = usb_remote_wakeup(udev);
4358 status = -ENODEV; /* Don't resuscitate */
4360 usb_unlock_device(udev);
4363 clear_bit(port1, hub->change_bits);
4368 /* Disconnect any existing devices under this port */
4370 if (hcd->phy && !hdev->parent &&
4371 !(portstatus & USB_PORT_STAT_CONNECTION))
4372 usb_phy_notify_disconnect(hcd->phy, udev->speed);
4373 usb_disconnect(&hub->ports[port1 - 1]->child);
4375 clear_bit(port1, hub->change_bits);
4377 /* We can forget about a "removed" device when there's a physical
4378 * disconnect or the connect status changes.
4380 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
4381 (portchange & USB_PORT_STAT_C_CONNECTION))
4382 clear_bit(port1, hub->removed_bits);
4384 if (portchange & (USB_PORT_STAT_C_CONNECTION |
4385 USB_PORT_STAT_C_ENABLE)) {
4386 status = hub_port_debounce_be_stable(hub, port1);
4388 if (status != -ENODEV && printk_ratelimit())
4389 dev_err(hub_dev, "connect-debounce failed, "
4390 "port %d disabled\n", port1);
4391 portstatus &= ~USB_PORT_STAT_CONNECTION;
4393 portstatus = status;
4397 /* Return now if debouncing failed or nothing is connected or
4398 * the device was "removed".
4400 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
4401 test_bit(port1, hub->removed_bits)) {
4403 /* maybe switch power back on (e.g. root hub was reset) */
4404 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
4405 && !port_is_power_on(hub, portstatus))
4406 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
4408 if (portstatus & USB_PORT_STAT_ENABLE)
4412 if (hub_is_superspeed(hub->hdev))
4418 for (i = 0; i < SET_CONFIG_TRIES; i++) {
4420 /* reallocate for each attempt, since references
4421 * to the previous one can escape in various ways
4423 udev = usb_alloc_dev(hdev, hdev->bus, port1);
4426 "couldn't allocate port %d usb_device\n",
4431 usb_set_device_state(udev, USB_STATE_POWERED);
4432 udev->bus_mA = hub->mA_per_port;
4433 udev->level = hdev->level + 1;
4434 udev->wusb = hub_is_wusb(hub);
4436 /* Only USB 3.0 devices are connected to SuperSpeed hubs. */
4437 if (hub_is_superspeed(hub->hdev))
4438 udev->speed = USB_SPEED_SUPER;
4440 udev->speed = USB_SPEED_UNKNOWN;
4442 choose_devnum(udev);
4443 if (udev->devnum <= 0) {
4444 status = -ENOTCONN; /* Don't retry */
4448 /* reset (non-USB 3.0 devices) and get descriptor */
4449 status = hub_port_init(hub, udev, port1, i);
4453 usb_detect_quirks(udev);
4454 if (udev->quirks & USB_QUIRK_DELAY_INIT)
4457 /* consecutive bus-powered hubs aren't reliable; they can
4458 * violate the voltage drop budget. if the new child has
4459 * a "powered" LED, users should notice we didn't enable it
4460 * (without reading syslog), even without per-port LEDs
4463 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
4464 && udev->bus_mA <= unit_load) {
4467 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
4470 dev_dbg(&udev->dev, "get status %d ?\n", status);
4473 le16_to_cpus(&devstat);
4474 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
4476 "can't connect bus-powered hub "
4478 if (hub->has_indicators) {
4479 hub->indicator[port1-1] =
4480 INDICATOR_AMBER_BLINK;
4481 schedule_delayed_work (&hub->leds, 0);
4483 status = -ENOTCONN; /* Don't retry */
4488 /* check for devices running slower than they could */
4489 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
4490 && udev->speed == USB_SPEED_FULL
4491 && highspeed_hubs != 0)
4492 check_highspeed (hub, udev, port1);
4494 /* Store the parent's children[] pointer. At this point
4495 * udev becomes globally accessible, although presumably
4496 * no one will look at it until hdev is unlocked.
4500 /* We mustn't add new devices if the parent hub has
4501 * been disconnected; we would race with the
4502 * recursively_mark_NOTATTACHED() routine.
4504 spin_lock_irq(&device_state_lock);
4505 if (hdev->state == USB_STATE_NOTATTACHED)
4508 hub->ports[port1 - 1]->child = udev;
4509 spin_unlock_irq(&device_state_lock);
4511 /* Run it through the hoops (find a driver, etc) */
4513 status = usb_new_device(udev);
4515 spin_lock_irq(&device_state_lock);
4516 hub->ports[port1 - 1]->child = NULL;
4517 spin_unlock_irq(&device_state_lock);
4524 status = hub_power_remaining(hub);
4526 dev_dbg(hub_dev, "%dmA power budget left\n", status);
4531 hub_port_disable(hub, port1, 1);
4533 usb_ep0_reinit(udev);
4534 release_devnum(udev);
4537 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
4540 if (hub->hdev->parent ||
4541 !hcd->driver->port_handed_over ||
4542 !(hcd->driver->port_handed_over)(hcd, port1)) {
4543 if (status != -ENOTCONN && status != -ENODEV)
4544 dev_err(hub_dev, "unable to enumerate USB device on port %d\n",
4549 hub_port_disable(hub, port1, 1);
4550 if (hcd->driver->relinquish_port && !hub->hdev->parent)
4551 hcd->driver->relinquish_port(hcd, port1);
4554 /* Returns 1 if there was a remote wakeup and a connect status change. */
4555 static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
4556 u16 portstatus, u16 portchange)
4558 struct usb_device *hdev;
4559 struct usb_device *udev;
4560 int connect_change = 0;
4564 udev = hub->ports[port - 1]->child;
4565 if (!hub_is_superspeed(hdev)) {
4566 if (!(portchange & USB_PORT_STAT_C_SUSPEND))
4568 usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND);
4570 if (!udev || udev->state != USB_STATE_SUSPENDED ||
4571 (portstatus & USB_PORT_STAT_LINK_STATE) !=
4577 /* TRSMRCY = 10 msec */
4580 usb_lock_device(udev);
4581 ret = usb_remote_wakeup(udev);
4582 usb_unlock_device(udev);
4587 hub_port_disable(hub, port, 1);
4589 dev_dbg(hub->intfdev, "resume on port %d, status %d\n",
4591 return connect_change;
4594 static void hub_events(void)
4596 struct list_head *tmp;
4597 struct usb_device *hdev;
4598 struct usb_interface *intf;
4599 struct usb_hub *hub;
4600 struct device *hub_dev;
4606 int connect_change, wakeup_change;
4609 * We restart the list every time to avoid a deadlock with
4610 * deleting hubs downstream from this one. This should be
4611 * safe since we delete the hub from the event list.
4612 * Not the most efficient, but avoids deadlocks.
4616 /* Grab the first entry at the beginning of the list */
4617 spin_lock_irq(&hub_event_lock);
4618 if (list_empty(&hub_event_list)) {
4619 spin_unlock_irq(&hub_event_lock);
4623 tmp = hub_event_list.next;
4626 hub = list_entry(tmp, struct usb_hub, event_list);
4627 kref_get(&hub->kref);
4628 spin_unlock_irq(&hub_event_lock);
4631 hub_dev = hub->intfdev;
4632 intf = to_usb_interface(hub_dev);
4633 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
4634 hdev->state, hub->descriptor
4635 ? hub->descriptor->bNbrPorts
4637 /* NOTE: expects max 15 ports... */
4638 (u16) hub->change_bits[0],
4639 (u16) hub->event_bits[0]);
4641 /* Lock the device, then check to see if we were
4642 * disconnected while waiting for the lock to succeed. */
4643 usb_lock_device(hdev);
4644 if (unlikely(hub->disconnected))
4645 goto loop_disconnected;
4647 /* If the hub has died, clean up after it */
4648 if (hdev->state == USB_STATE_NOTATTACHED) {
4649 hub->error = -ENODEV;
4650 hub_quiesce(hub, HUB_DISCONNECT);
4655 ret = usb_autopm_get_interface(intf);
4657 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
4661 /* If this is an inactive hub, do nothing */
4666 dev_dbg (hub_dev, "resetting for error %d\n",
4669 ret = usb_reset_device(hdev);
4672 "error resetting hub: %d\n", ret);
4680 /* deal with port status changes */
4681 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
4682 if (test_bit(i, hub->busy_bits))
4684 connect_change = test_bit(i, hub->change_bits);
4685 wakeup_change = test_and_clear_bit(i, hub->wakeup_bits);
4686 if (!test_and_clear_bit(i, hub->event_bits) &&
4687 !connect_change && !wakeup_change)
4690 ret = hub_port_status(hub, i,
4691 &portstatus, &portchange);
4695 if (portchange & USB_PORT_STAT_C_CONNECTION) {
4696 usb_clear_port_feature(hdev, i,
4697 USB_PORT_FEAT_C_CONNECTION);
4701 if (portchange & USB_PORT_STAT_C_ENABLE) {
4702 if (!connect_change)
4704 "port %d enable change, "
4707 usb_clear_port_feature(hdev, i,
4708 USB_PORT_FEAT_C_ENABLE);
4711 * EM interference sometimes causes badly
4712 * shielded USB devices to be shutdown by
4713 * the hub, this hack enables them again.
4714 * Works at least with mouse driver.
4716 if (!(portstatus & USB_PORT_STAT_ENABLE)
4718 && hub->ports[i - 1]->child) {
4721 "disabled by hub (EMI?), "
4728 if (hub_handle_remote_wakeup(hub, i,
4729 portstatus, portchange))
4732 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
4736 dev_dbg(hub_dev, "over-current change on port "
4738 usb_clear_port_feature(hdev, i,
4739 USB_PORT_FEAT_C_OVER_CURRENT);
4740 msleep(100); /* Cool down */
4741 hub_power_on(hub, true);
4742 hub_port_status(hub, i, &status, &unused);
4743 if (status & USB_PORT_STAT_OVERCURRENT)
4744 dev_err(hub_dev, "over-current "
4745 "condition on port %d\n", i);
4748 if (portchange & USB_PORT_STAT_C_RESET) {
4750 "reset change on port %d\n",
4752 usb_clear_port_feature(hdev, i,
4753 USB_PORT_FEAT_C_RESET);
4755 if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
4756 hub_is_superspeed(hub->hdev)) {
4758 "warm reset change on port %d\n",
4760 usb_clear_port_feature(hdev, i,
4761 USB_PORT_FEAT_C_BH_PORT_RESET);
4763 if (portchange & USB_PORT_STAT_C_LINK_STATE) {
4764 usb_clear_port_feature(hub->hdev, i,
4765 USB_PORT_FEAT_C_PORT_LINK_STATE);
4767 if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
4769 "config error on port %d\n",
4771 usb_clear_port_feature(hub->hdev, i,
4772 USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
4775 /* Warm reset a USB3 protocol port if it's in
4776 * SS.Inactive state.
4778 if (hub_port_warm_reset_required(hub, portstatus)) {
4780 struct usb_device *udev =
4781 hub->ports[i - 1]->child;
4783 dev_dbg(hub_dev, "warm reset port %d\n", i);
4785 !(portstatus & USB_PORT_STAT_CONNECTION) ||
4786 udev->state == USB_STATE_NOTATTACHED) {
4787 status = hub_port_reset(hub, i,
4788 NULL, HUB_BH_RESET_TIME,
4791 hub_port_disable(hub, i, 1);
4793 usb_lock_device(udev);
4794 status = usb_reset_device(udev);
4795 usb_unlock_device(udev);
4801 hub_port_connect_change(hub, i,
4802 portstatus, portchange);
4805 /* deal with hub status changes */
4806 if (test_and_clear_bit(0, hub->event_bits) == 0)
4808 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
4809 dev_err (hub_dev, "get_hub_status failed\n");
4811 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
4812 dev_dbg (hub_dev, "power change\n");
4813 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
4814 if (hubstatus & HUB_STATUS_LOCAL_POWER)
4815 /* FIXME: Is this always true? */
4816 hub->limited_power = 1;
4818 hub->limited_power = 0;
4820 if (hubchange & HUB_CHANGE_OVERCURRENT) {
4824 dev_dbg(hub_dev, "over-current change\n");
4825 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
4826 msleep(500); /* Cool down */
4827 hub_power_on(hub, true);
4828 hub_hub_status(hub, &status, &unused);
4829 if (status & HUB_STATUS_OVERCURRENT)
4830 dev_err(hub_dev, "over-current "
4836 /* Balance the usb_autopm_get_interface() above */
4837 usb_autopm_put_interface_no_suspend(intf);
4839 /* Balance the usb_autopm_get_interface_no_resume() in
4840 * kick_khubd() and allow autosuspend.
4842 usb_autopm_put_interface(intf);
4844 usb_unlock_device(hdev);
4845 kref_put(&hub->kref, hub_release);
4847 } /* end while (1) */
4850 static int hub_thread(void *__unused)
4852 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
4853 * port handover. Otherwise it might see that a full-speed device
4854 * was gone before the EHCI controller had handed its port over to
4855 * the companion full-speed controller.
4861 wait_event_freezable(khubd_wait,
4862 !list_empty(&hub_event_list) ||
4863 kthread_should_stop());
4864 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
4866 pr_debug("%s: khubd exiting\n", usbcore_name);
4870 static const struct usb_device_id hub_id_table[] = {
4871 { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
4872 | USB_DEVICE_ID_MATCH_INT_CLASS,
4873 .idVendor = USB_VENDOR_GENESYS_LOGIC,
4874 .bInterfaceClass = USB_CLASS_HUB,
4875 .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
4876 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
4877 .bDeviceClass = USB_CLASS_HUB},
4878 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
4879 .bInterfaceClass = USB_CLASS_HUB},
4880 { } /* Terminating entry */
4883 MODULE_DEVICE_TABLE (usb, hub_id_table);
4885 static struct usb_driver hub_driver = {
4888 .disconnect = hub_disconnect,
4889 .suspend = hub_suspend,
4890 .resume = hub_resume,
4891 .reset_resume = hub_reset_resume,
4892 .pre_reset = hub_pre_reset,
4893 .post_reset = hub_post_reset,
4894 .unlocked_ioctl = hub_ioctl,
4895 .id_table = hub_id_table,
4896 .supports_autosuspend = 1,
4899 int usb_hub_init(void)
4901 if (usb_register(&hub_driver) < 0) {
4902 printk(KERN_ERR "%s: can't register hub driver\n",
4907 khubd_task = kthread_run(hub_thread, NULL, "khubd");
4908 if (!IS_ERR(khubd_task))
4911 /* Fall through if kernel_thread failed */
4912 usb_deregister(&hub_driver);
4913 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
4918 void usb_hub_cleanup(void)
4920 kthread_stop(khubd_task);
4923 * Hub resources are freed for us by usb_deregister. It calls
4924 * usb_driver_purge on every device which in turn calls that
4925 * devices disconnect function if it is using this driver.
4926 * The hub_disconnect function takes care of releasing the
4927 * individual hub resources. -greg
4929 usb_deregister(&hub_driver);
4930 } /* usb_hub_cleanup() */
4932 static int descriptors_changed(struct usb_device *udev,
4933 struct usb_device_descriptor *old_device_descriptor)
4937 unsigned serial_len = 0;
4939 unsigned old_length;
4943 if (memcmp(&udev->descriptor, old_device_descriptor,
4944 sizeof(*old_device_descriptor)) != 0)
4947 /* Since the idVendor, idProduct, and bcdDevice values in the
4948 * device descriptor haven't changed, we will assume the
4949 * Manufacturer and Product strings haven't changed either.
4950 * But the SerialNumber string could be different (e.g., a
4951 * different flash card of the same brand).
4954 serial_len = strlen(udev->serial) + 1;
4957 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
4958 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
4959 len = max(len, old_length);
4962 buf = kmalloc(len, GFP_NOIO);
4964 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
4965 /* assume the worst */
4968 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
4969 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
4970 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
4972 if (length != old_length) {
4973 dev_dbg(&udev->dev, "config index %d, error %d\n",
4978 if (memcmp (buf, udev->rawdescriptors[index], old_length)
4980 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
4982 ((struct usb_config_descriptor *) buf)->
4983 bConfigurationValue);
4989 if (!changed && serial_len) {
4990 length = usb_string(udev, udev->descriptor.iSerialNumber,
4992 if (length + 1 != serial_len) {
4993 dev_dbg(&udev->dev, "serial string error %d\n",
4996 } else if (memcmp(buf, udev->serial, length) != 0) {
4997 dev_dbg(&udev->dev, "serial string changed\n");
5007 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
5008 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5010 * WARNING - don't use this routine to reset a composite device
5011 * (one with multiple interfaces owned by separate drivers)!
5012 * Use usb_reset_device() instead.
5014 * Do a port reset, reassign the device's address, and establish its
5015 * former operating configuration. If the reset fails, or the device's
5016 * descriptors change from their values before the reset, or the original
5017 * configuration and altsettings cannot be restored, a flag will be set
5018 * telling khubd to pretend the device has been disconnected and then
5019 * re-connected. All drivers will be unbound, and the device will be
5020 * re-enumerated and probed all over again.
5022 * Returns 0 if the reset succeeded, -ENODEV if the device has been
5023 * flagged for logical disconnection, or some other negative error code
5024 * if the reset wasn't even attempted.
5026 * The caller must own the device lock. For example, it's safe to use
5027 * this from a driver probe() routine after downloading new firmware.
5028 * For calls that might not occur during probe(), drivers should lock
5029 * the device using usb_lock_device_for_reset().
5031 * Locking exception: This routine may also be called from within an
5032 * autoresume handler. Such usage won't conflict with other tasks
5033 * holding the device lock because these tasks should always call
5034 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
5036 static int usb_reset_and_verify_device(struct usb_device *udev)
5038 struct usb_device *parent_hdev = udev->parent;
5039 struct usb_hub *parent_hub;
5040 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
5041 struct usb_device_descriptor descriptor = udev->descriptor;
5043 int port1 = udev->portnum;
5045 if (udev->state == USB_STATE_NOTATTACHED ||
5046 udev->state == USB_STATE_SUSPENDED) {
5047 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
5053 /* this requires hcd-specific logic; see ohci_restart() */
5054 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
5057 parent_hub = usb_hub_to_struct_hub(parent_hdev);
5059 /* Disable LPM and LTM while we reset the device and reinstall the alt
5060 * settings. Device-initiated LPM settings, and system exit latency
5061 * settings are cleared when the device is reset, so we have to set
5064 ret = usb_unlocked_disable_lpm(udev);
5066 dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__);
5069 ret = usb_disable_ltm(udev);
5071 dev_err(&udev->dev, "%s Failed to disable LTM\n.",
5076 set_bit(port1, parent_hub->busy_bits);
5077 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
5079 /* ep0 maxpacket size may change; let the HCD know about it.
5080 * Other endpoints will be handled by re-enumeration. */
5081 usb_ep0_reinit(udev);
5082 ret = hub_port_init(parent_hub, udev, port1, i);
5083 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
5086 clear_bit(port1, parent_hub->busy_bits);
5091 /* Device might have changed firmware (DFU or similar) */
5092 if (descriptors_changed(udev, &descriptor)) {
5093 dev_info(&udev->dev, "device firmware changed\n");
5094 udev->descriptor = descriptor; /* for disconnect() calls */
5098 /* Restore the device's previous configuration */
5099 if (!udev->actconfig)
5102 mutex_lock(hcd->bandwidth_mutex);
5103 ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
5105 dev_warn(&udev->dev,
5106 "Busted HC? Not enough HCD resources for "
5107 "old configuration.\n");
5108 mutex_unlock(hcd->bandwidth_mutex);
5111 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
5112 USB_REQ_SET_CONFIGURATION, 0,
5113 udev->actconfig->desc.bConfigurationValue, 0,
5114 NULL, 0, USB_CTRL_SET_TIMEOUT);
5117 "can't restore configuration #%d (error=%d)\n",
5118 udev->actconfig->desc.bConfigurationValue, ret);
5119 mutex_unlock(hcd->bandwidth_mutex);
5122 mutex_unlock(hcd->bandwidth_mutex);
5123 usb_set_device_state(udev, USB_STATE_CONFIGURED);
5125 /* Put interfaces back into the same altsettings as before.
5126 * Don't bother to send the Set-Interface request for interfaces
5127 * that were already in altsetting 0; besides being unnecessary,
5128 * many devices can't handle it. Instead just reset the host-side
5131 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
5132 struct usb_host_config *config = udev->actconfig;
5133 struct usb_interface *intf = config->interface[i];
5134 struct usb_interface_descriptor *desc;
5136 desc = &intf->cur_altsetting->desc;
5137 if (desc->bAlternateSetting == 0) {
5138 usb_disable_interface(udev, intf, true);
5139 usb_enable_interface(udev, intf, true);
5142 /* Let the bandwidth allocation function know that this
5143 * device has been reset, and it will have to use
5144 * alternate setting 0 as the current alternate setting.
5146 intf->resetting_device = 1;
5147 ret = usb_set_interface(udev, desc->bInterfaceNumber,
5148 desc->bAlternateSetting);
5149 intf->resetting_device = 0;
5152 dev_err(&udev->dev, "failed to restore interface %d "
5153 "altsetting %d (error=%d)\n",
5154 desc->bInterfaceNumber,
5155 desc->bAlternateSetting,
5162 /* Now that the alt settings are re-installed, enable LTM and LPM. */
5163 usb_unlocked_enable_lpm(udev);
5164 usb_enable_ltm(udev);
5168 /* LPM state doesn't matter when we're about to destroy the device. */
5169 hub_port_logical_disconnect(parent_hub, port1);
5174 * usb_reset_device - warn interface drivers and perform a USB port reset
5175 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5177 * Warns all drivers bound to registered interfaces (using their pre_reset
5178 * method), performs the port reset, and then lets the drivers know that
5179 * the reset is over (using their post_reset method).
5181 * Return value is the same as for usb_reset_and_verify_device().
5183 * The caller must own the device lock. For example, it's safe to use
5184 * this from a driver probe() routine after downloading new firmware.
5185 * For calls that might not occur during probe(), drivers should lock
5186 * the device using usb_lock_device_for_reset().
5188 * If an interface is currently being probed or disconnected, we assume
5189 * its driver knows how to handle resets. For all other interfaces,
5190 * if the driver doesn't have pre_reset and post_reset methods then
5191 * we attempt to unbind it and rebind afterward.
5193 int usb_reset_device(struct usb_device *udev)
5197 unsigned int noio_flag;
5198 struct usb_host_config *config = udev->actconfig;
5200 if (udev->state == USB_STATE_NOTATTACHED ||
5201 udev->state == USB_STATE_SUSPENDED) {
5202 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
5208 * Don't allocate memory with GFP_KERNEL in current
5209 * context to avoid possible deadlock if usb mass
5210 * storage interface or usbnet interface(iSCSI case)
5211 * is included in current configuration. The easist
5212 * approach is to do it for every device reset,
5213 * because the device 'memalloc_noio' flag may have
5214 * not been set before reseting the usb device.
5216 noio_flag = memalloc_noio_save();
5218 /* Prevent autosuspend during the reset */
5219 usb_autoresume_device(udev);
5222 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
5223 struct usb_interface *cintf = config->interface[i];
5224 struct usb_driver *drv;
5227 if (cintf->dev.driver) {
5228 drv = to_usb_driver(cintf->dev.driver);
5229 if (drv->pre_reset && drv->post_reset)
5230 unbind = (drv->pre_reset)(cintf);
5231 else if (cintf->condition ==
5232 USB_INTERFACE_BOUND)
5235 usb_forced_unbind_intf(cintf);
5240 ret = usb_reset_and_verify_device(udev);
5243 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
5244 struct usb_interface *cintf = config->interface[i];
5245 struct usb_driver *drv;
5246 int rebind = cintf->needs_binding;
5248 if (!rebind && cintf->dev.driver) {
5249 drv = to_usb_driver(cintf->dev.driver);
5250 if (drv->post_reset)
5251 rebind = (drv->post_reset)(cintf);
5252 else if (cintf->condition ==
5253 USB_INTERFACE_BOUND)
5256 cintf->needs_binding = 1;
5259 usb_unbind_and_rebind_marked_interfaces(udev);
5262 usb_autosuspend_device(udev);
5263 memalloc_noio_restore(noio_flag);
5266 EXPORT_SYMBOL_GPL(usb_reset_device);
5270 * usb_queue_reset_device - Reset a USB device from an atomic context
5271 * @iface: USB interface belonging to the device to reset
5273 * This function can be used to reset a USB device from an atomic
5274 * context, where usb_reset_device() won't work (as it blocks).
5276 * Doing a reset via this method is functionally equivalent to calling
5277 * usb_reset_device(), except for the fact that it is delayed to a
5278 * workqueue. This means that any drivers bound to other interfaces
5279 * might be unbound, as well as users from usbfs in user space.
5283 * - Scheduling two resets at the same time from two different drivers
5284 * attached to two different interfaces of the same device is
5285 * possible; depending on how the driver attached to each interface
5286 * handles ->pre_reset(), the second reset might happen or not.
5288 * - If a driver is unbound and it had a pending reset, the reset will
5291 * - This function can be called during .probe() or .disconnect()
5292 * times. On return from .disconnect(), any pending resets will be
5295 * There is no no need to lock/unlock the @reset_ws as schedule_work()
5298 * NOTE: We don't do any reference count tracking because it is not
5299 * needed. The lifecycle of the work_struct is tied to the
5300 * usb_interface. Before destroying the interface we cancel the
5301 * work_struct, so the fact that work_struct is queued and or
5302 * running means the interface (and thus, the device) exist and
5305 void usb_queue_reset_device(struct usb_interface *iface)
5307 schedule_work(&iface->reset_ws);
5309 EXPORT_SYMBOL_GPL(usb_queue_reset_device);
5312 * usb_hub_find_child - Get the pointer of child device
5313 * attached to the port which is specified by @port1.
5314 * @hdev: USB device belonging to the usb hub
5315 * @port1: port num to indicate which port the child device
5318 * USB drivers call this function to get hub's child device
5321 * Return NULL if input param is invalid and
5322 * child's usb_device pointer if non-NULL.
5324 struct usb_device *usb_hub_find_child(struct usb_device *hdev,
5327 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
5329 if (port1 < 1 || port1 > hdev->maxchild)
5331 return hub->ports[port1 - 1]->child;
5333 EXPORT_SYMBOL_GPL(usb_hub_find_child);
5336 * usb_set_hub_port_connect_type - set hub port connect type.
5337 * @hdev: USB device belonging to the usb hub
5338 * @port1: port num of the port
5339 * @type: connect type of the port
5341 void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1,
5342 enum usb_port_connect_type type)
5344 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
5346 hub->ports[port1 - 1]->connect_type = type;
5350 * usb_get_hub_port_connect_type - Get the port's connect type
5351 * @hdev: USB device belonging to the usb hub
5352 * @port1: port num of the port
5354 * Return connect type of the port and if input params are
5355 * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN.
5357 enum usb_port_connect_type
5358 usb_get_hub_port_connect_type(struct usb_device *hdev, int port1)
5360 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
5362 return hub->ports[port1 - 1]->connect_type;
5365 void usb_hub_adjust_deviceremovable(struct usb_device *hdev,
5366 struct usb_hub_descriptor *desc)
5368 enum usb_port_connect_type connect_type;
5371 if (!hub_is_superspeed(hdev)) {
5372 for (i = 1; i <= hdev->maxchild; i++) {
5373 connect_type = usb_get_hub_port_connect_type(hdev, i);
5375 if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
5376 u8 mask = 1 << (i%8);
5378 if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) {
5379 dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n",
5381 desc->u.hs.DeviceRemovable[i/8] |= mask;
5386 u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable);
5388 for (i = 1; i <= hdev->maxchild; i++) {
5389 connect_type = usb_get_hub_port_connect_type(hdev, i);
5391 if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
5394 if (!(port_removable & mask)) {
5395 dev_dbg(&hdev->dev, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n",
5397 port_removable |= mask;
5402 desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
5408 * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
5409 * @hdev: USB device belonging to the usb hub
5410 * @port1: port num of the port
5412 * Return port's acpi handle if successful, NULL if params are
5415 acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
5418 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
5420 return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev);