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)
9 * Released under the GPLv2 only.
10 * SPDX-License-Identifier: GPL-2.0
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/module.h>
16 #include <linux/moduleparam.h>
17 #include <linux/completion.h>
18 #include <linux/sched/mm.h>
19 #include <linux/list.h>
20 #include <linux/slab.h>
21 #include <linux/ioctl.h>
22 #include <linux/usb.h>
23 #include <linux/usbdevice_fs.h>
24 #include <linux/usb/hcd.h>
25 #include <linux/usb/otg.h>
26 #include <linux/usb/quirks.h>
27 #include <linux/workqueue.h>
28 #include <linux/mutex.h>
29 #include <linux/random.h>
30 #include <linux/pm_qos.h>
32 #include <linux/uaccess.h>
33 #include <asm/byteorder.h>
36 #include "otg_whitelist.h"
38 #define USB_VENDOR_GENESYS_LOGIC 0x05e3
39 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01
41 /* Protect struct usb_device->state and ->children members
42 * Note: Both are also protected by ->dev.sem, except that ->state can
43 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
44 static DEFINE_SPINLOCK(device_state_lock);
46 /* workqueue to process hub events */
47 static struct workqueue_struct *hub_wq;
48 static void hub_event(struct work_struct *work);
50 /* synchronize hub-port add/remove and peering operations */
51 DEFINE_MUTEX(usb_port_peer_mutex);
53 /* cycle leds on hubs that aren't blinking for attention */
54 static bool blinkenlights;
55 module_param(blinkenlights, bool, S_IRUGO);
56 MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs");
59 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
60 * 10 seconds to send reply for the initial 64-byte descriptor request.
62 /* define initial 64-byte descriptor request timeout in milliseconds */
63 static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT;
64 module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR);
65 MODULE_PARM_DESC(initial_descriptor_timeout,
66 "initial 64-byte descriptor request timeout in milliseconds "
67 "(default 5000 - 5.0 seconds)");
70 * As of 2.6.10 we introduce a new USB device initialization scheme which
71 * closely resembles the way Windows works. Hopefully it will be compatible
72 * with a wider range of devices than the old scheme. However some previously
73 * working devices may start giving rise to "device not accepting address"
74 * errors; if that happens the user can try the old scheme by adjusting the
75 * following module parameters.
77 * For maximum flexibility there are two boolean parameters to control the
78 * hub driver's behavior. On the first initialization attempt, if the
79 * "old_scheme_first" parameter is set then the old scheme will be used,
80 * otherwise the new scheme is used. If that fails and "use_both_schemes"
81 * is set, then the driver will make another attempt, using the other scheme.
83 static bool old_scheme_first;
84 module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
85 MODULE_PARM_DESC(old_scheme_first,
86 "start with the old device initialization scheme");
88 static bool use_both_schemes = 1;
89 module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
90 MODULE_PARM_DESC(use_both_schemes,
91 "try the other device initialization scheme if the "
94 /* Mutual exclusion for EHCI CF initialization. This interferes with
95 * port reset on some companion controllers.
97 DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
98 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
100 #define HUB_DEBOUNCE_TIMEOUT 2000
101 #define HUB_DEBOUNCE_STEP 25
102 #define HUB_DEBOUNCE_STABLE 100
104 static void hub_release(struct kref *kref);
105 static int usb_reset_and_verify_device(struct usb_device *udev);
106 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state);
108 static inline char *portspeed(struct usb_hub *hub, int portstatus)
110 if (hub_is_superspeedplus(hub->hdev))
112 if (hub_is_superspeed(hub->hdev))
114 if (portstatus & USB_PORT_STAT_HIGH_SPEED)
116 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
122 /* Note that hdev or one of its children must be locked! */
123 struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev)
125 if (!hdev || !hdev->actconfig || !hdev->maxchild)
127 return usb_get_intfdata(hdev->actconfig->interface[0]);
130 int usb_device_supports_lpm(struct usb_device *udev)
132 /* Some devices have trouble with LPM */
133 if (udev->quirks & USB_QUIRK_NO_LPM)
136 /* USB 2.1 (and greater) devices indicate LPM support through
137 * their USB 2.0 Extended Capabilities BOS descriptor.
139 if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) {
140 if (udev->bos->ext_cap &&
142 le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
148 * According to the USB 3.0 spec, all USB 3.0 devices must support LPM.
149 * However, there are some that don't, and they set the U1/U2 exit
152 if (!udev->bos->ss_cap) {
153 dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n");
157 if (udev->bos->ss_cap->bU1devExitLat == 0 &&
158 udev->bos->ss_cap->bU2DevExitLat == 0) {
160 dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n");
162 dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n");
166 if (!udev->parent || udev->parent->lpm_capable)
172 * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
175 static void usb_set_lpm_mel(struct usb_device *udev,
176 struct usb3_lpm_parameters *udev_lpm_params,
177 unsigned int udev_exit_latency,
179 struct usb3_lpm_parameters *hub_lpm_params,
180 unsigned int hub_exit_latency)
182 unsigned int total_mel;
183 unsigned int device_mel;
184 unsigned int hub_mel;
187 * Calculate the time it takes to transition all links from the roothub
188 * to the parent hub into U0. The parent hub must then decode the
189 * packet (hub header decode latency) to figure out which port it was
192 * The Hub Header decode latency is expressed in 0.1us intervals (0x1
193 * means 0.1us). Multiply that by 100 to get nanoseconds.
195 total_mel = hub_lpm_params->mel +
196 (hub->descriptor->u.ss.bHubHdrDecLat * 100);
199 * How long will it take to transition the downstream hub's port into
200 * U0? The greater of either the hub exit latency or the device exit
203 * The BOS U1/U2 exit latencies are expressed in 1us intervals.
204 * Multiply that by 1000 to get nanoseconds.
206 device_mel = udev_exit_latency * 1000;
207 hub_mel = hub_exit_latency * 1000;
208 if (device_mel > hub_mel)
209 total_mel += device_mel;
211 total_mel += hub_mel;
213 udev_lpm_params->mel = total_mel;
217 * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
218 * a transition from either U1 or U2.
220 static void usb_set_lpm_pel(struct usb_device *udev,
221 struct usb3_lpm_parameters *udev_lpm_params,
222 unsigned int udev_exit_latency,
224 struct usb3_lpm_parameters *hub_lpm_params,
225 unsigned int hub_exit_latency,
226 unsigned int port_to_port_exit_latency)
228 unsigned int first_link_pel;
229 unsigned int hub_pel;
232 * First, the device sends an LFPS to transition the link between the
233 * device and the parent hub into U0. The exit latency is the bigger of
234 * the device exit latency or the hub exit latency.
236 if (udev_exit_latency > hub_exit_latency)
237 first_link_pel = udev_exit_latency * 1000;
239 first_link_pel = hub_exit_latency * 1000;
242 * When the hub starts to receive the LFPS, there is a slight delay for
243 * it to figure out that one of the ports is sending an LFPS. Then it
244 * will forward the LFPS to its upstream link. The exit latency is the
245 * delay, plus the PEL that we calculated for this hub.
247 hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel;
250 * According to figure C-7 in the USB 3.0 spec, the PEL for this device
251 * is the greater of the two exit latencies.
253 if (first_link_pel > hub_pel)
254 udev_lpm_params->pel = first_link_pel;
256 udev_lpm_params->pel = hub_pel;
260 * Set the System Exit Latency (SEL) to indicate the total worst-case time from
261 * when a device initiates a transition to U0, until when it will receive the
262 * first packet from the host controller.
264 * Section C.1.5.1 describes the four components to this:
266 * - t2: time for the ERDY to make it from the device to the host.
267 * - t3: a host-specific delay to process the ERDY.
268 * - t4: time for the packet to make it from the host to the device.
270 * t3 is specific to both the xHCI host and the platform the host is integrated
271 * into. The Intel HW folks have said it's negligible, FIXME if a different
272 * vendor says otherwise.
274 static void usb_set_lpm_sel(struct usb_device *udev,
275 struct usb3_lpm_parameters *udev_lpm_params)
277 struct usb_device *parent;
278 unsigned int num_hubs;
279 unsigned int total_sel;
281 /* t1 = device PEL */
282 total_sel = udev_lpm_params->pel;
283 /* How many external hubs are in between the device & the root port. */
284 for (parent = udev->parent, num_hubs = 0; parent->parent;
285 parent = parent->parent)
287 /* t2 = 2.1us + 250ns * (num_hubs - 1) */
289 total_sel += 2100 + 250 * (num_hubs - 1);
291 /* t4 = 250ns * num_hubs */
292 total_sel += 250 * num_hubs;
294 udev_lpm_params->sel = total_sel;
297 static void usb_set_lpm_parameters(struct usb_device *udev)
300 unsigned int port_to_port_delay;
301 unsigned int udev_u1_del;
302 unsigned int udev_u2_del;
303 unsigned int hub_u1_del;
304 unsigned int hub_u2_del;
306 if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER)
309 hub = usb_hub_to_struct_hub(udev->parent);
310 /* It doesn't take time to transition the roothub into U0, since it
311 * doesn't have an upstream link.
316 udev_u1_del = udev->bos->ss_cap->bU1devExitLat;
317 udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat);
318 hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat;
319 hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat);
321 usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del,
322 hub, &udev->parent->u1_params, hub_u1_del);
324 usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del,
325 hub, &udev->parent->u2_params, hub_u2_del);
328 * Appendix C, section C.2.2.2, says that there is a slight delay from
329 * when the parent hub notices the downstream port is trying to
330 * transition to U0 to when the hub initiates a U0 transition on its
331 * upstream port. The section says the delays are tPort2PortU1EL and
332 * tPort2PortU2EL, but it doesn't define what they are.
334 * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
335 * about the same delays. Use the maximum delay calculations from those
336 * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
337 * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
338 * assume the device exit latencies they are talking about are the hub
341 * What do we do if the U2 exit latency is less than the U1 exit
342 * latency? It's possible, although not likely...
344 port_to_port_delay = 1;
346 usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del,
347 hub, &udev->parent->u1_params, hub_u1_del,
350 if (hub_u2_del > hub_u1_del)
351 port_to_port_delay = 1 + hub_u2_del - hub_u1_del;
353 port_to_port_delay = 1 + hub_u1_del;
355 usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del,
356 hub, &udev->parent->u2_params, hub_u2_del,
359 /* Now that we've got PEL, calculate SEL. */
360 usb_set_lpm_sel(udev, &udev->u1_params);
361 usb_set_lpm_sel(udev, &udev->u2_params);
364 /* USB 2.0 spec Section 11.24.4.5 */
365 static int get_hub_descriptor(struct usb_device *hdev, void *data)
370 if (hub_is_superspeed(hdev)) {
371 dtype = USB_DT_SS_HUB;
372 size = USB_DT_SS_HUB_SIZE;
375 size = sizeof(struct usb_hub_descriptor);
378 for (i = 0; i < 3; i++) {
379 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
380 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
381 dtype << 8, 0, data, size,
382 USB_CTRL_GET_TIMEOUT);
383 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
390 * USB 2.0 spec Section 11.24.2.1
392 static int clear_hub_feature(struct usb_device *hdev, int feature)
394 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
395 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
399 * USB 2.0 spec Section 11.24.2.2
401 int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature)
403 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
404 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
409 * USB 2.0 spec Section 11.24.2.13
411 static int set_port_feature(struct usb_device *hdev, int port1, int feature)
413 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
414 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
418 static char *to_led_name(int selector)
435 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
436 * for info about using port indicators
438 static void set_port_led(struct usb_hub *hub, int port1, int selector)
440 struct usb_port *port_dev = hub->ports[port1 - 1];
443 status = set_port_feature(hub->hdev, (selector << 8) | port1,
444 USB_PORT_FEAT_INDICATOR);
445 dev_dbg(&port_dev->dev, "indicator %s status %d\n",
446 to_led_name(selector), status);
449 #define LED_CYCLE_PERIOD ((2*HZ)/3)
451 static void led_work(struct work_struct *work)
453 struct usb_hub *hub =
454 container_of(work, struct usb_hub, leds.work);
455 struct usb_device *hdev = hub->hdev;
457 unsigned changed = 0;
460 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
463 for (i = 0; i < hdev->maxchild; i++) {
464 unsigned selector, mode;
466 /* 30%-50% duty cycle */
468 switch (hub->indicator[i]) {
470 case INDICATOR_CYCLE:
472 selector = HUB_LED_AUTO;
473 mode = INDICATOR_AUTO;
475 /* blinking green = sw attention */
476 case INDICATOR_GREEN_BLINK:
477 selector = HUB_LED_GREEN;
478 mode = INDICATOR_GREEN_BLINK_OFF;
480 case INDICATOR_GREEN_BLINK_OFF:
481 selector = HUB_LED_OFF;
482 mode = INDICATOR_GREEN_BLINK;
484 /* blinking amber = hw attention */
485 case INDICATOR_AMBER_BLINK:
486 selector = HUB_LED_AMBER;
487 mode = INDICATOR_AMBER_BLINK_OFF;
489 case INDICATOR_AMBER_BLINK_OFF:
490 selector = HUB_LED_OFF;
491 mode = INDICATOR_AMBER_BLINK;
493 /* blink green/amber = reserved */
494 case INDICATOR_ALT_BLINK:
495 selector = HUB_LED_GREEN;
496 mode = INDICATOR_ALT_BLINK_OFF;
498 case INDICATOR_ALT_BLINK_OFF:
499 selector = HUB_LED_AMBER;
500 mode = INDICATOR_ALT_BLINK;
505 if (selector != HUB_LED_AUTO)
507 set_port_led(hub, i + 1, selector);
508 hub->indicator[i] = mode;
510 if (!changed && blinkenlights) {
512 cursor %= hdev->maxchild;
513 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
514 hub->indicator[cursor] = INDICATOR_CYCLE;
518 queue_delayed_work(system_power_efficient_wq,
519 &hub->leds, LED_CYCLE_PERIOD);
522 /* use a short timeout for hub/port status fetches */
523 #define USB_STS_TIMEOUT 1000
524 #define USB_STS_RETRIES 5
527 * USB 2.0 spec Section 11.24.2.6
529 static int get_hub_status(struct usb_device *hdev,
530 struct usb_hub_status *data)
532 int i, status = -ETIMEDOUT;
534 for (i = 0; i < USB_STS_RETRIES &&
535 (status == -ETIMEDOUT || status == -EPIPE); i++) {
536 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
537 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
538 data, sizeof(*data), USB_STS_TIMEOUT);
544 * USB 2.0 spec Section 11.24.2.7
545 * USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6
547 static int get_port_status(struct usb_device *hdev, int port1,
548 void *data, u16 value, u16 length)
550 int i, status = -ETIMEDOUT;
552 for (i = 0; i < USB_STS_RETRIES &&
553 (status == -ETIMEDOUT || status == -EPIPE); i++) {
554 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
555 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value,
556 port1, data, length, USB_STS_TIMEOUT);
561 static int hub_ext_port_status(struct usb_hub *hub, int port1, int type,
562 u16 *status, u16 *change, u32 *ext_status)
567 if (type != HUB_PORT_STATUS)
570 mutex_lock(&hub->status_mutex);
571 ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len);
574 dev_err(hub->intfdev,
575 "%s failed (err = %d)\n", __func__, ret);
579 *status = le16_to_cpu(hub->status->port.wPortStatus);
580 *change = le16_to_cpu(hub->status->port.wPortChange);
581 if (type != HUB_PORT_STATUS && ext_status)
582 *ext_status = le32_to_cpu(
583 hub->status->port.dwExtPortStatus);
586 mutex_unlock(&hub->status_mutex);
590 static int hub_port_status(struct usb_hub *hub, int port1,
591 u16 *status, u16 *change)
593 return hub_ext_port_status(hub, port1, HUB_PORT_STATUS,
594 status, change, NULL);
597 static void kick_hub_wq(struct usb_hub *hub)
599 struct usb_interface *intf;
601 if (hub->disconnected || work_pending(&hub->events))
605 * Suppress autosuspend until the event is proceed.
607 * Be careful and make sure that the symmetric operation is
608 * always called. We are here only when there is no pending
609 * work for this hub. Therefore put the interface either when
610 * the new work is called or when it is canceled.
612 intf = to_usb_interface(hub->intfdev);
613 usb_autopm_get_interface_no_resume(intf);
614 kref_get(&hub->kref);
616 if (queue_work(hub_wq, &hub->events))
619 /* the work has already been scheduled */
620 usb_autopm_put_interface_async(intf);
621 kref_put(&hub->kref, hub_release);
624 void usb_kick_hub_wq(struct usb_device *hdev)
626 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
633 * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
634 * Notification, which indicates it had initiated remote wakeup.
636 * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
637 * device initiates resume, so the USB core will not receive notice of the
638 * resume through the normal hub interrupt URB.
640 void usb_wakeup_notification(struct usb_device *hdev,
641 unsigned int portnum)
648 hub = usb_hub_to_struct_hub(hdev);
650 set_bit(portnum, hub->wakeup_bits);
654 EXPORT_SYMBOL_GPL(usb_wakeup_notification);
656 /* completion function, fires on port status changes and various faults */
657 static void hub_irq(struct urb *urb)
659 struct usb_hub *hub = urb->context;
660 int status = urb->status;
665 case -ENOENT: /* synchronous unlink */
666 case -ECONNRESET: /* async unlink */
667 case -ESHUTDOWN: /* hardware going away */
670 default: /* presumably an error */
671 /* Cause a hub reset after 10 consecutive errors */
672 dev_dbg(hub->intfdev, "transfer --> %d\n", status);
673 if ((++hub->nerrors < 10) || hub->error)
678 /* let hub_wq handle things */
679 case 0: /* we got data: port status changed */
681 for (i = 0; i < urb->actual_length; ++i)
682 bits |= ((unsigned long) ((*hub->buffer)[i]))
684 hub->event_bits[0] = bits;
690 /* Something happened, let hub_wq figure it out */
697 status = usb_submit_urb(hub->urb, GFP_ATOMIC);
698 if (status != 0 && status != -ENODEV && status != -EPERM)
699 dev_err(hub->intfdev, "resubmit --> %d\n", status);
702 /* USB 2.0 spec Section 11.24.2.3 */
704 hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt)
706 /* Need to clear both directions for control ep */
707 if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) ==
708 USB_ENDPOINT_XFER_CONTROL) {
709 int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
710 HUB_CLEAR_TT_BUFFER, USB_RT_PORT,
711 devinfo ^ 0x8000, tt, NULL, 0, 1000);
715 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
716 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
721 * enumeration blocks hub_wq for a long time. we use keventd instead, since
722 * long blocking there is the exception, not the rule. accordingly, HCDs
723 * talking to TTs must queue control transfers (not just bulk and iso), so
724 * both can talk to the same hub concurrently.
726 static void hub_tt_work(struct work_struct *work)
728 struct usb_hub *hub =
729 container_of(work, struct usb_hub, tt.clear_work);
732 spin_lock_irqsave(&hub->tt.lock, flags);
733 while (!list_empty(&hub->tt.clear_list)) {
734 struct list_head *next;
735 struct usb_tt_clear *clear;
736 struct usb_device *hdev = hub->hdev;
737 const struct hc_driver *drv;
740 next = hub->tt.clear_list.next;
741 clear = list_entry(next, struct usb_tt_clear, clear_list);
742 list_del(&clear->clear_list);
744 /* drop lock so HCD can concurrently report other TT errors */
745 spin_unlock_irqrestore(&hub->tt.lock, flags);
746 status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt);
747 if (status && status != -ENODEV)
749 "clear tt %d (%04x) error %d\n",
750 clear->tt, clear->devinfo, status);
752 /* Tell the HCD, even if the operation failed */
753 drv = clear->hcd->driver;
754 if (drv->clear_tt_buffer_complete)
755 (drv->clear_tt_buffer_complete)(clear->hcd, clear->ep);
758 spin_lock_irqsave(&hub->tt.lock, flags);
760 spin_unlock_irqrestore(&hub->tt.lock, flags);
764 * usb_hub_set_port_power - control hub port's power state
765 * @hdev: USB device belonging to the usb hub
768 * @set: expected status
770 * call this function to control port's power via setting or
771 * clearing the port's PORT_POWER feature.
773 * Return: 0 if successful. A negative error code otherwise.
775 int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
781 ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
783 ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
789 set_bit(port1, hub->power_bits);
791 clear_bit(port1, hub->power_bits);
796 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
797 * @urb: an URB associated with the failed or incomplete split transaction
799 * High speed HCDs use this to tell the hub driver that some split control or
800 * bulk transaction failed in a way that requires clearing internal state of
801 * a transaction translator. This is normally detected (and reported) from
804 * It may not be possible for that hub to handle additional full (or low)
805 * speed transactions until that state is fully cleared out.
807 * Return: 0 if successful. A negative error code otherwise.
809 int usb_hub_clear_tt_buffer(struct urb *urb)
811 struct usb_device *udev = urb->dev;
812 int pipe = urb->pipe;
813 struct usb_tt *tt = udev->tt;
815 struct usb_tt_clear *clear;
817 /* we've got to cope with an arbitrary number of pending TT clears,
818 * since each TT has "at least two" buffers that can need it (and
819 * there can be many TTs per hub). even if they're uncommon.
821 clear = kmalloc(sizeof *clear, GFP_ATOMIC);
823 dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
824 /* FIXME recover somehow ... RESET_TT? */
828 /* info that CLEAR_TT_BUFFER needs */
829 clear->tt = tt->multi ? udev->ttport : 1;
830 clear->devinfo = usb_pipeendpoint (pipe);
831 clear->devinfo |= udev->devnum << 4;
832 clear->devinfo |= usb_pipecontrol(pipe)
833 ? (USB_ENDPOINT_XFER_CONTROL << 11)
834 : (USB_ENDPOINT_XFER_BULK << 11);
835 if (usb_pipein(pipe))
836 clear->devinfo |= 1 << 15;
838 /* info for completion callback */
839 clear->hcd = bus_to_hcd(udev->bus);
842 /* tell keventd to clear state for this TT */
843 spin_lock_irqsave(&tt->lock, flags);
844 list_add_tail(&clear->clear_list, &tt->clear_list);
845 schedule_work(&tt->clear_work);
846 spin_unlock_irqrestore(&tt->lock, flags);
849 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer);
851 static void hub_power_on(struct usb_hub *hub, bool do_delay)
855 /* Enable power on each port. Some hubs have reserved values
856 * of LPSM (> 2) in their descriptors, even though they are
857 * USB 2.0 hubs. Some hubs do not implement port-power switching
858 * but only emulate it. In all cases, the ports won't work
859 * unless we send these messages to the hub.
861 if (hub_is_port_power_switchable(hub))
862 dev_dbg(hub->intfdev, "enabling power on all ports\n");
864 dev_dbg(hub->intfdev, "trying to enable port power on "
865 "non-switchable hub\n");
866 for (port1 = 1; port1 <= hub->hdev->maxchild; port1++)
867 if (test_bit(port1, hub->power_bits))
868 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
870 usb_clear_port_feature(hub->hdev, port1,
871 USB_PORT_FEAT_POWER);
873 msleep(hub_power_on_good_delay(hub));
876 static int hub_hub_status(struct usb_hub *hub,
877 u16 *status, u16 *change)
881 mutex_lock(&hub->status_mutex);
882 ret = get_hub_status(hub->hdev, &hub->status->hub);
885 dev_err(hub->intfdev,
886 "%s failed (err = %d)\n", __func__, ret);
888 *status = le16_to_cpu(hub->status->hub.wHubStatus);
889 *change = le16_to_cpu(hub->status->hub.wHubChange);
892 mutex_unlock(&hub->status_mutex);
896 static int hub_set_port_link_state(struct usb_hub *hub, int port1,
897 unsigned int link_status)
899 return set_port_feature(hub->hdev,
900 port1 | (link_status << 3),
901 USB_PORT_FEAT_LINK_STATE);
905 * Disable a port and mark a logical connect-change event, so that some
906 * time later hub_wq will disconnect() any existing usb_device on the port
907 * and will re-enumerate if there actually is a device attached.
909 static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
911 dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n");
912 hub_port_disable(hub, port1, 1);
914 /* FIXME let caller ask to power down the port:
915 * - some devices won't enumerate without a VBUS power cycle
916 * - SRP saves power that way
917 * - ... new call, TBD ...
918 * That's easy if this hub can switch power per-port, and
919 * hub_wq reactivates the port later (timer, SRP, etc).
920 * Powerdown must be optional, because of reset/DFU.
923 set_bit(port1, hub->change_bits);
928 * usb_remove_device - disable a device's port on its parent hub
929 * @udev: device to be disabled and removed
930 * Context: @udev locked, must be able to sleep.
932 * After @udev's port has been disabled, hub_wq is notified and it will
933 * see that the device has been disconnected. When the device is
934 * physically unplugged and something is plugged in, the events will
935 * be received and processed normally.
937 * Return: 0 if successful. A negative error code otherwise.
939 int usb_remove_device(struct usb_device *udev)
942 struct usb_interface *intf;
944 if (!udev->parent) /* Can't remove a root hub */
946 hub = usb_hub_to_struct_hub(udev->parent);
947 intf = to_usb_interface(hub->intfdev);
949 usb_autopm_get_interface(intf);
950 set_bit(udev->portnum, hub->removed_bits);
951 hub_port_logical_disconnect(hub, udev->portnum);
952 usb_autopm_put_interface(intf);
956 enum hub_activation_type {
957 HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */
958 HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME,
961 static void hub_init_func2(struct work_struct *ws);
962 static void hub_init_func3(struct work_struct *ws);
964 static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
966 struct usb_device *hdev = hub->hdev;
971 bool need_debounce_delay = false;
974 /* Continue a partial initialization */
975 if (type == HUB_INIT2 || type == HUB_INIT3) {
976 device_lock(&hdev->dev);
978 /* Was the hub disconnected while we were waiting? */
979 if (hub->disconnected)
981 if (type == HUB_INIT2)
985 kref_get(&hub->kref);
987 /* The superspeed hub except for root hub has to use Hub Depth
988 * value as an offset into the route string to locate the bits
989 * it uses to determine the downstream port number. So hub driver
990 * should send a set hub depth request to superspeed hub after
991 * the superspeed hub is set configuration in initialization or
994 * After a resume, port power should still be on.
995 * For any other type of activation, turn it on.
997 if (type != HUB_RESUME) {
998 if (hdev->parent && hub_is_superspeed(hdev)) {
999 ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
1000 HUB_SET_DEPTH, USB_RT_HUB,
1001 hdev->level - 1, 0, NULL, 0,
1002 USB_CTRL_SET_TIMEOUT);
1004 dev_err(hub->intfdev,
1005 "set hub depth failed\n");
1008 /* Speed up system boot by using a delayed_work for the
1009 * hub's initial power-up delays. This is pretty awkward
1010 * and the implementation looks like a home-brewed sort of
1011 * setjmp/longjmp, but it saves at least 100 ms for each
1012 * root hub (assuming usbcore is compiled into the kernel
1013 * rather than as a module). It adds up.
1015 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
1016 * because for those activation types the ports have to be
1017 * operational when we return. In theory this could be done
1018 * for HUB_POST_RESET, but it's easier not to.
1020 if (type == HUB_INIT) {
1021 delay = hub_power_on_good_delay(hub);
1023 hub_power_on(hub, false);
1024 INIT_DELAYED_WORK(&hub->init_work, hub_init_func2);
1025 queue_delayed_work(system_power_efficient_wq,
1027 msecs_to_jiffies(delay));
1029 /* Suppress autosuspend until init is done */
1030 usb_autopm_get_interface_no_resume(
1031 to_usb_interface(hub->intfdev));
1032 return; /* Continues at init2: below */
1033 } else if (type == HUB_RESET_RESUME) {
1034 /* The internal host controller state for the hub device
1035 * may be gone after a host power loss on system resume.
1036 * Update the device's info so the HW knows it's a hub.
1038 hcd = bus_to_hcd(hdev->bus);
1039 if (hcd->driver->update_hub_device) {
1040 ret = hcd->driver->update_hub_device(hcd, hdev,
1041 &hub->tt, GFP_NOIO);
1043 dev_err(hub->intfdev, "Host not "
1044 "accepting hub info "
1046 dev_err(hub->intfdev, "LS/FS devices "
1047 "and hubs may not work "
1048 "under this hub\n.");
1051 hub_power_on(hub, true);
1053 hub_power_on(hub, true);
1059 * Check each port and set hub->change_bits to let hub_wq know
1060 * which ports need attention.
1062 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
1063 struct usb_port *port_dev = hub->ports[port1 - 1];
1064 struct usb_device *udev = port_dev->child;
1065 u16 portstatus, portchange;
1067 portstatus = portchange = 0;
1068 status = hub_port_status(hub, port1, &portstatus, &portchange);
1072 if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
1073 dev_dbg(&port_dev->dev, "status %04x change %04x\n",
1074 portstatus, portchange);
1077 * After anything other than HUB_RESUME (i.e., initialization
1078 * or any sort of reset), every port should be disabled.
1079 * Unconnected ports should likewise be disabled (paranoia),
1080 * and so should ports for which we have no usb_device.
1082 if ((portstatus & USB_PORT_STAT_ENABLE) && (
1083 type != HUB_RESUME ||
1084 !(portstatus & USB_PORT_STAT_CONNECTION) ||
1086 udev->state == USB_STATE_NOTATTACHED)) {
1088 * USB3 protocol ports will automatically transition
1089 * to Enabled state when detect an USB3.0 device attach.
1090 * Do not disable USB3 protocol ports, just pretend
1093 portstatus &= ~USB_PORT_STAT_ENABLE;
1094 if (!hub_is_superspeed(hdev))
1095 usb_clear_port_feature(hdev, port1,
1096 USB_PORT_FEAT_ENABLE);
1099 /* Clear status-change flags; we'll debounce later */
1100 if (portchange & USB_PORT_STAT_C_CONNECTION) {
1101 need_debounce_delay = true;
1102 usb_clear_port_feature(hub->hdev, port1,
1103 USB_PORT_FEAT_C_CONNECTION);
1105 if (portchange & USB_PORT_STAT_C_ENABLE) {
1106 need_debounce_delay = true;
1107 usb_clear_port_feature(hub->hdev, port1,
1108 USB_PORT_FEAT_C_ENABLE);
1110 if (portchange & USB_PORT_STAT_C_RESET) {
1111 need_debounce_delay = true;
1112 usb_clear_port_feature(hub->hdev, port1,
1113 USB_PORT_FEAT_C_RESET);
1115 if ((portchange & USB_PORT_STAT_C_BH_RESET) &&
1116 hub_is_superspeed(hub->hdev)) {
1117 need_debounce_delay = true;
1118 usb_clear_port_feature(hub->hdev, port1,
1119 USB_PORT_FEAT_C_BH_PORT_RESET);
1121 /* We can forget about a "removed" device when there's a
1122 * physical disconnect or the connect status changes.
1124 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
1125 (portchange & USB_PORT_STAT_C_CONNECTION))
1126 clear_bit(port1, hub->removed_bits);
1128 if (!udev || udev->state == USB_STATE_NOTATTACHED) {
1129 /* Tell hub_wq to disconnect the device or
1130 * check for a new connection
1132 if (udev || (portstatus & USB_PORT_STAT_CONNECTION) ||
1133 (portstatus & USB_PORT_STAT_OVERCURRENT))
1134 set_bit(port1, hub->change_bits);
1136 } else if (portstatus & USB_PORT_STAT_ENABLE) {
1137 bool port_resumed = (portstatus &
1138 USB_PORT_STAT_LINK_STATE) ==
1140 /* The power session apparently survived the resume.
1141 * If there was an overcurrent or suspend change
1142 * (i.e., remote wakeup request), have hub_wq
1143 * take care of it. Look at the port link state
1144 * for USB 3.0 hubs, since they don't have a suspend
1145 * change bit, and they don't set the port link change
1146 * bit on device-initiated resume.
1148 if (portchange || (hub_is_superspeed(hub->hdev) &&
1150 set_bit(port1, hub->change_bits);
1152 } else if (udev->persist_enabled) {
1154 udev->reset_resume = 1;
1156 /* Don't set the change_bits when the device
1159 if (test_bit(port1, hub->power_bits))
1160 set_bit(port1, hub->change_bits);
1163 /* The power session is gone; tell hub_wq */
1164 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1165 set_bit(port1, hub->change_bits);
1169 /* If no port-status-change flags were set, we don't need any
1170 * debouncing. If flags were set we can try to debounce the
1171 * ports all at once right now, instead of letting hub_wq do them
1172 * one at a time later on.
1174 * If any port-status changes do occur during this delay, hub_wq
1175 * will see them later and handle them normally.
1177 if (need_debounce_delay) {
1178 delay = HUB_DEBOUNCE_STABLE;
1180 /* Don't do a long sleep inside a workqueue routine */
1181 if (type == HUB_INIT2) {
1182 INIT_DELAYED_WORK(&hub->init_work, hub_init_func3);
1183 queue_delayed_work(system_power_efficient_wq,
1185 msecs_to_jiffies(delay));
1186 device_unlock(&hdev->dev);
1187 return; /* Continues at init3: below */
1195 status = usb_submit_urb(hub->urb, GFP_NOIO);
1197 dev_err(hub->intfdev, "activate --> %d\n", status);
1198 if (hub->has_indicators && blinkenlights)
1199 queue_delayed_work(system_power_efficient_wq,
1200 &hub->leds, LED_CYCLE_PERIOD);
1202 /* Scan all ports that need attention */
1205 if (type == HUB_INIT2 || type == HUB_INIT3) {
1206 /* Allow autosuspend if it was suppressed */
1208 usb_autopm_put_interface_async(to_usb_interface(hub->intfdev));
1209 device_unlock(&hdev->dev);
1212 kref_put(&hub->kref, hub_release);
1215 /* Implement the continuations for the delays above */
1216 static void hub_init_func2(struct work_struct *ws)
1218 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
1220 hub_activate(hub, HUB_INIT2);
1223 static void hub_init_func3(struct work_struct *ws)
1225 struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work);
1227 hub_activate(hub, HUB_INIT3);
1230 enum hub_quiescing_type {
1231 HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND
1234 static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type)
1236 struct usb_device *hdev = hub->hdev;
1239 /* hub_wq and related activity won't re-trigger */
1242 if (type != HUB_SUSPEND) {
1243 /* Disconnect all the children */
1244 for (i = 0; i < hdev->maxchild; ++i) {
1245 if (hub->ports[i]->child)
1246 usb_disconnect(&hub->ports[i]->child);
1250 /* Stop hub_wq and related activity */
1251 usb_kill_urb(hub->urb);
1252 if (hub->has_indicators)
1253 cancel_delayed_work_sync(&hub->leds);
1255 flush_work(&hub->tt.clear_work);
1258 static void hub_pm_barrier_for_all_ports(struct usb_hub *hub)
1262 for (i = 0; i < hub->hdev->maxchild; ++i)
1263 pm_runtime_barrier(&hub->ports[i]->dev);
1266 /* caller has locked the hub device */
1267 static int hub_pre_reset(struct usb_interface *intf)
1269 struct usb_hub *hub = usb_get_intfdata(intf);
1271 hub_quiesce(hub, HUB_PRE_RESET);
1273 hub_pm_barrier_for_all_ports(hub);
1277 /* caller has locked the hub device */
1278 static int hub_post_reset(struct usb_interface *intf)
1280 struct usb_hub *hub = usb_get_intfdata(intf);
1283 hub_pm_barrier_for_all_ports(hub);
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";
1303 hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL);
1309 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
1314 mutex_init(&hub->status_mutex);
1316 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
1317 if (!hub->descriptor) {
1322 /* Request the entire hub descriptor.
1323 * hub->descriptor can handle USB_MAXCHILDREN ports,
1324 * but the hub can/will return fewer bytes here.
1326 ret = get_hub_descriptor(hdev, hub->descriptor);
1328 message = "can't read hub descriptor";
1330 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
1331 message = "hub has too many ports!";
1334 } else if (hub->descriptor->bNbrPorts == 0) {
1335 message = "hub doesn't have any ports!";
1340 maxchild = hub->descriptor->bNbrPorts;
1341 dev_info(hub_dev, "%d port%s detected\n", maxchild,
1342 (maxchild == 1) ? "" : "s");
1344 hub->ports = kzalloc(maxchild * sizeof(struct usb_port *), GFP_KERNEL);
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))) {
1362 char portstr[USB_MAXCHILDREN + 1];
1364 for (i = 0; i < maxchild; i++)
1365 portstr[i] = hub->descriptor->u.hs.DeviceRemovable
1366 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
1368 portstr[maxchild] = 0;
1369 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
1371 dev_dbg(hub_dev, "standalone hub\n");
1373 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1374 case HUB_CHAR_COMMON_LPSM:
1375 dev_dbg(hub_dev, "ganged power switching\n");
1377 case HUB_CHAR_INDV_PORT_LPSM:
1378 dev_dbg(hub_dev, "individual port power switching\n");
1380 case HUB_CHAR_NO_LPSM:
1382 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
1386 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1387 case HUB_CHAR_COMMON_OCPM:
1388 dev_dbg(hub_dev, "global over-current protection\n");
1390 case HUB_CHAR_INDV_PORT_OCPM:
1391 dev_dbg(hub_dev, "individual port over-current protection\n");
1393 case HUB_CHAR_NO_OCPM:
1395 dev_dbg(hub_dev, "no over-current protection\n");
1399 spin_lock_init(&hub->tt.lock);
1400 INIT_LIST_HEAD(&hub->tt.clear_list);
1401 INIT_WORK(&hub->tt.clear_work, hub_tt_work);
1402 switch (hdev->descriptor.bDeviceProtocol) {
1405 case USB_HUB_PR_HS_SINGLE_TT:
1406 dev_dbg(hub_dev, "Single TT\n");
1409 case USB_HUB_PR_HS_MULTI_TT:
1410 ret = usb_set_interface(hdev, 0, 1);
1412 dev_dbg(hub_dev, "TT per port\n");
1415 dev_err(hub_dev, "Using single TT (err %d)\n",
1420 /* USB 3.0 hubs don't have a TT */
1423 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
1424 hdev->descriptor.bDeviceProtocol);
1428 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1429 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
1430 case HUB_TTTT_8_BITS:
1431 if (hdev->descriptor.bDeviceProtocol != 0) {
1432 hub->tt.think_time = 666;
1433 dev_dbg(hub_dev, "TT requires at most %d "
1434 "FS bit times (%d ns)\n",
1435 8, hub->tt.think_time);
1438 case HUB_TTTT_16_BITS:
1439 hub->tt.think_time = 666 * 2;
1440 dev_dbg(hub_dev, "TT requires at most %d "
1441 "FS bit times (%d ns)\n",
1442 16, hub->tt.think_time);
1444 case HUB_TTTT_24_BITS:
1445 hub->tt.think_time = 666 * 3;
1446 dev_dbg(hub_dev, "TT requires at most %d "
1447 "FS bit times (%d ns)\n",
1448 24, hub->tt.think_time);
1450 case HUB_TTTT_32_BITS:
1451 hub->tt.think_time = 666 * 4;
1452 dev_dbg(hub_dev, "TT requires at most %d "
1453 "FS bit times (%d ns)\n",
1454 32, hub->tt.think_time);
1458 /* probe() zeroes hub->indicator[] */
1459 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1460 hub->has_indicators = 1;
1461 dev_dbg(hub_dev, "Port indicators are supported\n");
1464 dev_dbg(hub_dev, "power on to power good time: %dms\n",
1465 hub->descriptor->bPwrOn2PwrGood * 2);
1467 /* power budgeting mostly matters with bus-powered hubs,
1468 * and battery-powered root hubs (may provide just 8 mA).
1470 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
1472 message = "can't get hub status";
1475 hcd = bus_to_hcd(hdev->bus);
1476 if (hdev == hdev->bus->root_hub) {
1477 if (hcd->power_budget > 0)
1478 hdev->bus_mA = hcd->power_budget;
1480 hdev->bus_mA = full_load * maxchild;
1481 if (hdev->bus_mA >= full_load)
1482 hub->mA_per_port = full_load;
1484 hub->mA_per_port = hdev->bus_mA;
1485 hub->limited_power = 1;
1487 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1488 int remaining = hdev->bus_mA -
1489 hub->descriptor->bHubContrCurrent;
1491 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
1492 hub->descriptor->bHubContrCurrent);
1493 hub->limited_power = 1;
1495 if (remaining < maxchild * unit_load)
1497 "insufficient power available "
1498 "to use all downstream ports\n");
1499 hub->mA_per_port = unit_load; /* 7.2.1 */
1501 } else { /* Self-powered external hub */
1502 /* FIXME: What about battery-powered external hubs that
1503 * provide less current per port? */
1504 hub->mA_per_port = full_load;
1506 if (hub->mA_per_port < full_load)
1507 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
1510 ret = hub_hub_status(hub, &hubstatus, &hubchange);
1512 message = "can't get hub status";
1516 /* local power status reports aren't always correct */
1517 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1518 dev_dbg(hub_dev, "local power source is %s\n",
1519 (hubstatus & HUB_STATUS_LOCAL_POWER)
1520 ? "lost (inactive)" : "good");
1522 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1523 dev_dbg(hub_dev, "%sover-current condition exists\n",
1524 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
1526 /* set up the interrupt endpoint
1527 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1528 * bytes as USB2.0[11.12.3] says because some hubs are known
1529 * to send more data (and thus cause overflow). For root hubs,
1530 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1531 * to be big enough for at least USB_MAXCHILDREN ports. */
1532 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
1533 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
1535 if (maxp > sizeof(*hub->buffer))
1536 maxp = sizeof(*hub->buffer);
1538 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
1544 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
1545 hub, endpoint->bInterval);
1547 /* maybe cycle the hub leds */
1548 if (hub->has_indicators && blinkenlights)
1549 hub->indicator[0] = INDICATOR_CYCLE;
1551 mutex_lock(&usb_port_peer_mutex);
1552 for (i = 0; i < maxchild; i++) {
1553 ret = usb_hub_create_port_device(hub, i + 1);
1555 dev_err(hub->intfdev,
1556 "couldn't create port%d device.\n", i + 1);
1561 for (i = 0; i < hdev->maxchild; i++) {
1562 struct usb_port *port_dev = hub->ports[i];
1564 pm_runtime_put(&port_dev->dev);
1567 mutex_unlock(&usb_port_peer_mutex);
1571 /* Update the HCD's internal representation of this hub before hub_wq
1572 * starts getting port status changes for devices under the hub.
1574 if (hcd->driver->update_hub_device) {
1575 ret = hcd->driver->update_hub_device(hcd, hdev,
1576 &hub->tt, GFP_KERNEL);
1578 message = "can't update HCD hub info";
1583 usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
1585 hub_activate(hub, HUB_INIT);
1589 dev_err(hub_dev, "config failed, %s (err %d)\n",
1591 /* hub_disconnect() frees urb and descriptor */
1595 static void hub_release(struct kref *kref)
1597 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
1599 usb_put_dev(hub->hdev);
1600 usb_put_intf(to_usb_interface(hub->intfdev));
1604 static unsigned highspeed_hubs;
1606 static void hub_disconnect(struct usb_interface *intf)
1608 struct usb_hub *hub = usb_get_intfdata(intf);
1609 struct usb_device *hdev = interface_to_usbdev(intf);
1613 * Stop adding new hub events. We do not want to block here and thus
1614 * will not try to remove any pending work item.
1616 hub->disconnected = 1;
1618 /* Disconnect all children and quiesce the hub */
1620 hub_quiesce(hub, HUB_DISCONNECT);
1622 mutex_lock(&usb_port_peer_mutex);
1624 /* Avoid races with recursively_mark_NOTATTACHED() */
1625 spin_lock_irq(&device_state_lock);
1626 port1 = hdev->maxchild;
1628 usb_set_intfdata(intf, NULL);
1629 spin_unlock_irq(&device_state_lock);
1631 for (; port1 > 0; --port1)
1632 usb_hub_remove_port_device(hub, port1);
1634 mutex_unlock(&usb_port_peer_mutex);
1636 if (hub->hdev->speed == USB_SPEED_HIGH)
1639 usb_free_urb(hub->urb);
1641 kfree(hub->descriptor);
1645 pm_suspend_ignore_children(&intf->dev, false);
1646 kref_put(&hub->kref, hub_release);
1649 static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
1651 struct usb_host_interface *desc;
1652 struct usb_endpoint_descriptor *endpoint;
1653 struct usb_device *hdev;
1654 struct usb_hub *hub;
1656 desc = intf->cur_altsetting;
1657 hdev = interface_to_usbdev(intf);
1660 * Set default autosuspend delay as 0 to speedup bus suspend,
1661 * based on the below considerations:
1663 * - Unlike other drivers, the hub driver does not rely on the
1664 * autosuspend delay to provide enough time to handle a wakeup
1665 * event, and the submitted status URB is just to check future
1666 * change on hub downstream ports, so it is safe to do it.
1668 * - The patch might cause one or more auto supend/resume for
1669 * below very rare devices when they are plugged into hub
1672 * devices having trouble initializing, and disconnect
1673 * themselves from the bus and then reconnect a second
1676 * devices just for downloading firmware, and disconnects
1677 * themselves after completing it
1679 * For these quite rare devices, their drivers may change the
1680 * autosuspend delay of their parent hub in the probe() to one
1681 * appropriate value to avoid the subtle problem if someone
1684 * - The patch may cause one or more auto suspend/resume on
1685 * hub during running 'lsusb', but it is probably too
1686 * infrequent to worry about.
1688 * - Change autosuspend delay of hub can avoid unnecessary auto
1689 * suspend timer for hub, also may decrease power consumption
1692 * - If user has indicated to prevent autosuspend by passing
1693 * usbcore.autosuspend = -1 then keep autosuspend disabled.
1696 if (hdev->dev.power.autosuspend_delay >= 0)
1697 pm_runtime_set_autosuspend_delay(&hdev->dev, 0);
1701 * Hubs have proper suspend/resume support, except for root hubs
1702 * where the controller driver doesn't have bus_suspend and
1703 * bus_resume methods.
1705 if (hdev->parent) { /* normal device */
1706 usb_enable_autosuspend(hdev);
1707 } else { /* root hub */
1708 const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver;
1710 if (drv->bus_suspend && drv->bus_resume)
1711 usb_enable_autosuspend(hdev);
1714 if (hdev->level == MAX_TOPO_LEVEL) {
1716 "Unsupported bus topology: hub nested too deep\n");
1720 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1722 dev_warn(&intf->dev, "ignoring external hub\n");
1727 /* Some hubs have a subclass of 1, which AFAICT according to the */
1728 /* specs is not defined, but it works */
1729 if ((desc->desc.bInterfaceSubClass != 0) &&
1730 (desc->desc.bInterfaceSubClass != 1)) {
1732 dev_err(&intf->dev, "bad descriptor, ignoring hub\n");
1736 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1737 if (desc->desc.bNumEndpoints != 1)
1738 goto descriptor_error;
1740 endpoint = &desc->endpoint[0].desc;
1742 /* If it's not an interrupt in endpoint, we'd better punt! */
1743 if (!usb_endpoint_is_int_in(endpoint))
1744 goto descriptor_error;
1746 /* We found a hub */
1747 dev_info(&intf->dev, "USB hub found\n");
1749 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1753 kref_init(&hub->kref);
1754 hub->intfdev = &intf->dev;
1756 INIT_DELAYED_WORK(&hub->leds, led_work);
1757 INIT_DELAYED_WORK(&hub->init_work, NULL);
1758 INIT_WORK(&hub->events, hub_event);
1762 usb_set_intfdata(intf, hub);
1763 intf->needs_remote_wakeup = 1;
1764 pm_suspend_ignore_children(&intf->dev, true);
1766 if (hdev->speed == USB_SPEED_HIGH)
1769 if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND)
1770 hub->quirk_check_port_auto_suspend = 1;
1772 if (hub_configure(hub, endpoint) >= 0)
1775 hub_disconnect(intf);
1780 hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
1782 struct usb_device *hdev = interface_to_usbdev(intf);
1783 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1785 /* assert ifno == 0 (part of hub spec) */
1787 case USBDEVFS_HUB_PORTINFO: {
1788 struct usbdevfs_hub_portinfo *info = user_data;
1791 spin_lock_irq(&device_state_lock);
1792 if (hdev->devnum <= 0)
1795 info->nports = hdev->maxchild;
1796 for (i = 0; i < info->nports; i++) {
1797 if (hub->ports[i]->child == NULL)
1801 hub->ports[i]->child->devnum;
1804 spin_unlock_irq(&device_state_lock);
1806 return info->nports + 1;
1815 * Allow user programs to claim ports on a hub. When a device is attached
1816 * to one of these "claimed" ports, the program will "own" the device.
1818 static int find_port_owner(struct usb_device *hdev, unsigned port1,
1819 struct usb_dev_state ***ppowner)
1821 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1823 if (hdev->state == USB_STATE_NOTATTACHED)
1825 if (port1 == 0 || port1 > hdev->maxchild)
1828 /* Devices not managed by the hub driver
1829 * will always have maxchild equal to 0.
1831 *ppowner = &(hub->ports[port1 - 1]->port_owner);
1835 /* In the following three functions, the caller must hold hdev's lock */
1836 int usb_hub_claim_port(struct usb_device *hdev, unsigned port1,
1837 struct usb_dev_state *owner)
1840 struct usb_dev_state **powner;
1842 rc = find_port_owner(hdev, port1, &powner);
1850 EXPORT_SYMBOL_GPL(usb_hub_claim_port);
1852 int usb_hub_release_port(struct usb_device *hdev, unsigned port1,
1853 struct usb_dev_state *owner)
1856 struct usb_dev_state **powner;
1858 rc = find_port_owner(hdev, port1, &powner);
1861 if (*powner != owner)
1866 EXPORT_SYMBOL_GPL(usb_hub_release_port);
1868 void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner)
1870 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
1873 for (n = 0; n < hdev->maxchild; n++) {
1874 if (hub->ports[n]->port_owner == owner)
1875 hub->ports[n]->port_owner = NULL;
1880 /* The caller must hold udev's lock */
1881 bool usb_device_is_owned(struct usb_device *udev)
1883 struct usb_hub *hub;
1885 if (udev->state == USB_STATE_NOTATTACHED || !udev->parent)
1887 hub = usb_hub_to_struct_hub(udev->parent);
1888 return !!hub->ports[udev->portnum - 1]->port_owner;
1891 static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1893 struct usb_hub *hub = usb_hub_to_struct_hub(udev);
1896 for (i = 0; i < udev->maxchild; ++i) {
1897 if (hub->ports[i]->child)
1898 recursively_mark_NOTATTACHED(hub->ports[i]->child);
1900 if (udev->state == USB_STATE_SUSPENDED)
1901 udev->active_duration -= jiffies;
1902 udev->state = USB_STATE_NOTATTACHED;
1906 * usb_set_device_state - change a device's current state (usbcore, hcds)
1907 * @udev: pointer to device whose state should be changed
1908 * @new_state: new state value to be stored
1910 * udev->state is _not_ fully protected by the device lock. Although
1911 * most transitions are made only while holding the lock, the state can
1912 * can change to USB_STATE_NOTATTACHED at almost any time. This
1913 * is so that devices can be marked as disconnected as soon as possible,
1914 * without having to wait for any semaphores to be released. As a result,
1915 * all changes to any device's state must be protected by the
1916 * device_state_lock spinlock.
1918 * Once a device has been added to the device tree, all changes to its state
1919 * should be made using this routine. The state should _not_ be set directly.
1921 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1922 * Otherwise udev->state is set to new_state, and if new_state is
1923 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1924 * to USB_STATE_NOTATTACHED.
1926 void usb_set_device_state(struct usb_device *udev,
1927 enum usb_device_state new_state)
1929 unsigned long flags;
1932 spin_lock_irqsave(&device_state_lock, flags);
1933 if (udev->state == USB_STATE_NOTATTACHED)
1935 else if (new_state != USB_STATE_NOTATTACHED) {
1937 /* root hub wakeup capabilities are managed out-of-band
1938 * and may involve silicon errata ... ignore them here.
1941 if (udev->state == USB_STATE_SUSPENDED
1942 || new_state == USB_STATE_SUSPENDED)
1943 ; /* No change to wakeup settings */
1944 else if (new_state == USB_STATE_CONFIGURED)
1945 wakeup = (udev->quirks &
1946 USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 :
1947 udev->actconfig->desc.bmAttributes &
1948 USB_CONFIG_ATT_WAKEUP;
1952 if (udev->state == USB_STATE_SUSPENDED &&
1953 new_state != USB_STATE_SUSPENDED)
1954 udev->active_duration -= jiffies;
1955 else if (new_state == USB_STATE_SUSPENDED &&
1956 udev->state != USB_STATE_SUSPENDED)
1957 udev->active_duration += jiffies;
1958 udev->state = new_state;
1960 recursively_mark_NOTATTACHED(udev);
1961 spin_unlock_irqrestore(&device_state_lock, flags);
1963 device_set_wakeup_capable(&udev->dev, wakeup);
1965 EXPORT_SYMBOL_GPL(usb_set_device_state);
1968 * Choose a device number.
1970 * Device numbers are used as filenames in usbfs. On USB-1.1 and
1971 * USB-2.0 buses they are also used as device addresses, however on
1972 * USB-3.0 buses the address is assigned by the controller hardware
1973 * and it usually is not the same as the device number.
1975 * WUSB devices are simple: they have no hubs behind, so the mapping
1976 * device <-> virtual port number becomes 1:1. Why? to simplify the
1977 * life of the device connection logic in
1978 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1979 * handshake we need to assign a temporary address in the unauthorized
1980 * space. For simplicity we use the first virtual port number found to
1981 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1982 * and that becomes it's address [X < 128] or its unauthorized address
1985 * We add 1 as an offset to the one-based USB-stack port number
1986 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1987 * 0 is reserved by USB for default address; (b) Linux's USB stack
1988 * uses always #1 for the root hub of the controller. So USB stack's
1989 * port #1, which is wusb virtual-port #0 has address #2.
1991 * Devices connected under xHCI are not as simple. The host controller
1992 * supports virtualization, so the hardware assigns device addresses and
1993 * the HCD must setup data structures before issuing a set address
1994 * command to the hardware.
1996 static void choose_devnum(struct usb_device *udev)
1999 struct usb_bus *bus = udev->bus;
2001 /* be safe when more hub events are proceed in parallel */
2002 mutex_lock(&bus->devnum_next_mutex);
2004 devnum = udev->portnum + 1;
2005 BUG_ON(test_bit(devnum, bus->devmap.devicemap));
2007 /* Try to allocate the next devnum beginning at
2008 * bus->devnum_next. */
2009 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
2012 devnum = find_next_zero_bit(bus->devmap.devicemap,
2014 bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1);
2017 set_bit(devnum, bus->devmap.devicemap);
2018 udev->devnum = devnum;
2020 mutex_unlock(&bus->devnum_next_mutex);
2023 static void release_devnum(struct usb_device *udev)
2025 if (udev->devnum > 0) {
2026 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
2031 static void update_devnum(struct usb_device *udev, int devnum)
2033 /* The address for a WUSB device is managed by wusbcore. */
2035 udev->devnum = devnum;
2038 static void hub_free_dev(struct usb_device *udev)
2040 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2042 /* Root hubs aren't real devices, so don't free HCD resources */
2043 if (hcd->driver->free_dev && udev->parent)
2044 hcd->driver->free_dev(hcd, udev);
2047 static void hub_disconnect_children(struct usb_device *udev)
2049 struct usb_hub *hub = usb_hub_to_struct_hub(udev);
2052 /* Free up all the children before we remove this device */
2053 for (i = 0; i < udev->maxchild; i++) {
2054 if (hub->ports[i]->child)
2055 usb_disconnect(&hub->ports[i]->child);
2060 * usb_disconnect - disconnect a device (usbcore-internal)
2061 * @pdev: pointer to device being disconnected
2062 * Context: !in_interrupt ()
2064 * Something got disconnected. Get rid of it and all of its children.
2066 * If *pdev is a normal device then the parent hub must already be locked.
2067 * If *pdev is a root hub then the caller must hold the usb_bus_idr_lock,
2068 * which protects the set of root hubs as well as the list of buses.
2070 * Only hub drivers (including virtual root hub drivers for host
2071 * controllers) should ever call this.
2073 * This call is synchronous, and may not be used in an interrupt context.
2075 void usb_disconnect(struct usb_device **pdev)
2077 struct usb_port *port_dev = NULL;
2078 struct usb_device *udev = *pdev;
2079 struct usb_hub *hub = NULL;
2082 /* mark the device as inactive, so any further urb submissions for
2083 * this device (and any of its children) will fail immediately.
2084 * this quiesces everything except pending urbs.
2086 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2087 dev_info(&udev->dev, "USB disconnect, device number %d\n",
2090 usb_lock_device(udev);
2092 hub_disconnect_children(udev);
2094 /* deallocate hcd/hardware state ... nuking all pending urbs and
2095 * cleaning up all state associated with the current configuration
2096 * so that the hardware is now fully quiesced.
2098 dev_dbg(&udev->dev, "unregistering device\n");
2099 usb_disable_device(udev, 0);
2100 usb_hcd_synchronize_unlinks(udev);
2103 port1 = udev->portnum;
2104 hub = usb_hub_to_struct_hub(udev->parent);
2105 port_dev = hub->ports[port1 - 1];
2107 sysfs_remove_link(&udev->dev.kobj, "port");
2108 sysfs_remove_link(&port_dev->dev.kobj, "device");
2111 * As usb_port_runtime_resume() de-references udev, make
2112 * sure no resumes occur during removal
2114 if (!test_and_set_bit(port1, hub->child_usage_bits))
2115 pm_runtime_get_sync(&port_dev->dev);
2118 usb_remove_ep_devs(&udev->ep0);
2119 usb_unlock_device(udev);
2121 /* Unregister the device. The device driver is responsible
2122 * for de-configuring the device and invoking the remove-device
2123 * notifier chain (used by usbfs and possibly others).
2125 device_del(&udev->dev);
2127 /* Free the device number and delete the parent's children[]
2128 * (or root_hub) pointer.
2130 release_devnum(udev);
2132 /* Avoid races with recursively_mark_NOTATTACHED() */
2133 spin_lock_irq(&device_state_lock);
2135 spin_unlock_irq(&device_state_lock);
2137 if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits))
2138 pm_runtime_put(&port_dev->dev);
2142 put_device(&udev->dev);
2145 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
2146 static void show_string(struct usb_device *udev, char *id, char *string)
2150 dev_info(&udev->dev, "%s: %s\n", id, string);
2153 static void announce_device(struct usb_device *udev)
2155 dev_info(&udev->dev, "New USB device found, idVendor=%04x, idProduct=%04x\n",
2156 le16_to_cpu(udev->descriptor.idVendor),
2157 le16_to_cpu(udev->descriptor.idProduct));
2158 dev_info(&udev->dev,
2159 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
2160 udev->descriptor.iManufacturer,
2161 udev->descriptor.iProduct,
2162 udev->descriptor.iSerialNumber);
2163 show_string(udev, "Product", udev->product);
2164 show_string(udev, "Manufacturer", udev->manufacturer);
2165 show_string(udev, "SerialNumber", udev->serial);
2168 static inline void announce_device(struct usb_device *udev) { }
2173 * usb_enumerate_device_otg - FIXME (usbcore-internal)
2174 * @udev: newly addressed device (in ADDRESS state)
2176 * Finish enumeration for On-The-Go devices
2178 * Return: 0 if successful. A negative error code otherwise.
2180 static int usb_enumerate_device_otg(struct usb_device *udev)
2184 #ifdef CONFIG_USB_OTG
2186 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
2187 * to wake us after we've powered off VBUS; and HNP, switching roles
2188 * "host" to "peripheral". The OTG descriptor helps figure this out.
2190 if (!udev->bus->is_b_host
2192 && udev->parent == udev->bus->root_hub) {
2193 struct usb_otg_descriptor *desc = NULL;
2194 struct usb_bus *bus = udev->bus;
2195 unsigned port1 = udev->portnum;
2197 /* descriptor may appear anywhere in config */
2198 err = __usb_get_extra_descriptor(udev->rawdescriptors[0],
2199 le16_to_cpu(udev->config[0].desc.wTotalLength),
2200 USB_DT_OTG, (void **) &desc);
2201 if (err || !(desc->bmAttributes & USB_OTG_HNP))
2204 dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n",
2205 (port1 == bus->otg_port) ? "" : "non-");
2207 /* enable HNP before suspend, it's simpler */
2208 if (port1 == bus->otg_port) {
2209 bus->b_hnp_enable = 1;
2210 err = usb_control_msg(udev,
2211 usb_sndctrlpipe(udev, 0),
2212 USB_REQ_SET_FEATURE, 0,
2213 USB_DEVICE_B_HNP_ENABLE,
2215 USB_CTRL_SET_TIMEOUT);
2218 * OTG MESSAGE: report errors here,
2219 * customize to match your product.
2221 dev_err(&udev->dev, "can't set HNP mode: %d\n",
2223 bus->b_hnp_enable = 0;
2225 } else if (desc->bLength == sizeof
2226 (struct usb_otg_descriptor)) {
2227 /* Set a_alt_hnp_support for legacy otg device */
2228 err = usb_control_msg(udev,
2229 usb_sndctrlpipe(udev, 0),
2230 USB_REQ_SET_FEATURE, 0,
2231 USB_DEVICE_A_ALT_HNP_SUPPORT,
2233 USB_CTRL_SET_TIMEOUT);
2236 "set a_alt_hnp_support failed: %d\n",
2246 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
2247 * @udev: newly addressed device (in ADDRESS state)
2249 * This is only called by usb_new_device() and usb_authorize_device()
2250 * and FIXME -- all comments that apply to them apply here wrt to
2253 * If the device is WUSB and not authorized, we don't attempt to read
2254 * the string descriptors, as they will be errored out by the device
2255 * until it has been authorized.
2257 * Return: 0 if successful. A negative error code otherwise.
2259 static int usb_enumerate_device(struct usb_device *udev)
2262 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2264 if (udev->config == NULL) {
2265 err = usb_get_configuration(udev);
2268 dev_err(&udev->dev, "can't read configurations, error %d\n",
2274 /* read the standard strings and cache them if present */
2275 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
2276 udev->manufacturer = usb_cache_string(udev,
2277 udev->descriptor.iManufacturer);
2278 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
2280 err = usb_enumerate_device_otg(udev);
2284 if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST) && hcd->tpl_support &&
2285 !is_targeted(udev)) {
2286 /* Maybe it can talk to us, though we can't talk to it.
2287 * (Includes HNP test device.)
2289 if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable
2290 || udev->bus->is_b_host)) {
2291 err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND);
2293 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
2298 usb_detect_interface_quirks(udev);
2303 static void set_usb_port_removable(struct usb_device *udev)
2305 struct usb_device *hdev = udev->parent;
2306 struct usb_hub *hub;
2307 u8 port = udev->portnum;
2308 u16 wHubCharacteristics;
2309 bool removable = true;
2314 hub = usb_hub_to_struct_hub(udev->parent);
2317 * If the platform firmware has provided information about a port,
2318 * use that to determine whether it's removable.
2320 switch (hub->ports[udev->portnum - 1]->connect_type) {
2321 case USB_PORT_CONNECT_TYPE_HOT_PLUG:
2322 udev->removable = USB_DEVICE_REMOVABLE;
2324 case USB_PORT_CONNECT_TYPE_HARD_WIRED:
2325 case USB_PORT_NOT_USED:
2326 udev->removable = USB_DEVICE_FIXED;
2333 * Otherwise, check whether the hub knows whether a port is removable
2336 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
2338 if (!(wHubCharacteristics & HUB_CHAR_COMPOUND))
2341 if (hub_is_superspeed(hdev)) {
2342 if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable)
2346 if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8)))
2351 udev->removable = USB_DEVICE_REMOVABLE;
2353 udev->removable = USB_DEVICE_FIXED;
2358 * usb_new_device - perform initial device setup (usbcore-internal)
2359 * @udev: newly addressed device (in ADDRESS state)
2361 * This is called with devices which have been detected but not fully
2362 * enumerated. The device descriptor is available, but not descriptors
2363 * for any device configuration. The caller must have locked either
2364 * the parent hub (if udev is a normal device) or else the
2365 * usb_bus_idr_lock (if udev is a root hub). The parent's pointer to
2366 * udev has already been installed, but udev is not yet visible through
2367 * sysfs or other filesystem code.
2369 * This call is synchronous, and may not be used in an interrupt context.
2371 * Only the hub driver or root-hub registrar should ever call this.
2373 * Return: Whether the device is configured properly or not. Zero if the
2374 * interface was registered with the driver core; else a negative errno
2378 int usb_new_device(struct usb_device *udev)
2383 /* Initialize non-root-hub device wakeup to disabled;
2384 * device (un)configuration controls wakeup capable
2385 * sysfs power/wakeup controls wakeup enabled/disabled
2387 device_init_wakeup(&udev->dev, 0);
2390 /* Tell the runtime-PM framework the device is active */
2391 pm_runtime_set_active(&udev->dev);
2392 pm_runtime_get_noresume(&udev->dev);
2393 pm_runtime_use_autosuspend(&udev->dev);
2394 pm_runtime_enable(&udev->dev);
2396 /* By default, forbid autosuspend for all devices. It will be
2397 * allowed for hubs during binding.
2399 usb_disable_autosuspend(udev);
2401 err = usb_enumerate_device(udev); /* Read descriptors */
2404 dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n",
2405 udev->devnum, udev->bus->busnum,
2406 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
2407 /* export the usbdev device-node for libusb */
2408 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
2409 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
2411 /* Tell the world! */
2412 announce_device(udev);
2415 add_device_randomness(udev->serial, strlen(udev->serial));
2417 add_device_randomness(udev->product, strlen(udev->product));
2418 if (udev->manufacturer)
2419 add_device_randomness(udev->manufacturer,
2420 strlen(udev->manufacturer));
2422 device_enable_async_suspend(&udev->dev);
2424 /* check whether the hub or firmware marks this port as non-removable */
2426 set_usb_port_removable(udev);
2428 /* Register the device. The device driver is responsible
2429 * for configuring the device and invoking the add-device
2430 * notifier chain (used by usbfs and possibly others).
2432 err = device_add(&udev->dev);
2434 dev_err(&udev->dev, "can't device_add, error %d\n", err);
2438 /* Create link files between child device and usb port device. */
2440 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
2441 int port1 = udev->portnum;
2442 struct usb_port *port_dev = hub->ports[port1 - 1];
2444 err = sysfs_create_link(&udev->dev.kobj,
2445 &port_dev->dev.kobj, "port");
2449 err = sysfs_create_link(&port_dev->dev.kobj,
2450 &udev->dev.kobj, "device");
2452 sysfs_remove_link(&udev->dev.kobj, "port");
2456 if (!test_and_set_bit(port1, hub->child_usage_bits))
2457 pm_runtime_get_sync(&port_dev->dev);
2460 (void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev);
2461 usb_mark_last_busy(udev);
2462 pm_runtime_put_sync_autosuspend(&udev->dev);
2466 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2467 pm_runtime_disable(&udev->dev);
2468 pm_runtime_set_suspended(&udev->dev);
2474 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
2475 * @usb_dev: USB device
2477 * Move the USB device to a very basic state where interfaces are disabled
2478 * and the device is in fact unconfigured and unusable.
2480 * We share a lock (that we have) with device_del(), so we need to
2485 int usb_deauthorize_device(struct usb_device *usb_dev)
2487 usb_lock_device(usb_dev);
2488 if (usb_dev->authorized == 0)
2489 goto out_unauthorized;
2491 usb_dev->authorized = 0;
2492 usb_set_configuration(usb_dev, -1);
2495 usb_unlock_device(usb_dev);
2500 int usb_authorize_device(struct usb_device *usb_dev)
2504 usb_lock_device(usb_dev);
2505 if (usb_dev->authorized == 1)
2506 goto out_authorized;
2508 result = usb_autoresume_device(usb_dev);
2510 dev_err(&usb_dev->dev,
2511 "can't autoresume for authorization: %d\n", result);
2512 goto error_autoresume;
2515 if (usb_dev->wusb) {
2516 result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
2518 dev_err(&usb_dev->dev, "can't re-read device descriptor for "
2519 "authorization: %d\n", result);
2520 goto error_device_descriptor;
2524 usb_dev->authorized = 1;
2525 /* Choose and set the configuration. This registers the interfaces
2526 * with the driver core and lets interface drivers bind to them.
2528 c = usb_choose_configuration(usb_dev);
2530 result = usb_set_configuration(usb_dev, c);
2532 dev_err(&usb_dev->dev,
2533 "can't set config #%d, error %d\n", c, result);
2534 /* This need not be fatal. The user can try to
2535 * set other configurations. */
2538 dev_info(&usb_dev->dev, "authorized to connect\n");
2540 error_device_descriptor:
2541 usb_autosuspend_device(usb_dev);
2544 usb_unlock_device(usb_dev); /* complements locktree */
2549 * Return 1 if port speed is SuperSpeedPlus, 0 otherwise
2550 * check it from the link protocol field of the current speed ID attribute.
2551 * current speed ID is got from ext port status request. Sublink speed attribute
2552 * table is returned with the hub BOS SSP device capability descriptor
2554 static int port_speed_is_ssp(struct usb_device *hdev, int speed_id)
2559 struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap;
2564 ssa_count = le32_to_cpu(ssp_cap->bmAttributes) &
2565 USB_SSP_SUBLINK_SPEED_ATTRIBS;
2567 for (i = 0; i <= ssa_count; i++) {
2568 ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]);
2569 if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID))
2570 return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP);
2575 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2576 static unsigned hub_is_wusb(struct usb_hub *hub)
2578 struct usb_hcd *hcd;
2579 if (hub->hdev->parent != NULL) /* not a root hub? */
2581 hcd = bus_to_hcd(hub->hdev->bus);
2582 return hcd->wireless;
2586 #define PORT_RESET_TRIES 5
2587 #define SET_ADDRESS_TRIES 2
2588 #define GET_DESCRIPTOR_TRIES 2
2589 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2590 #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first)
2592 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
2593 #define HUB_SHORT_RESET_TIME 10
2594 #define HUB_BH_RESET_TIME 50
2595 #define HUB_LONG_RESET_TIME 200
2596 #define HUB_RESET_TIMEOUT 800
2599 * "New scheme" enumeration causes an extra state transition to be
2600 * exposed to an xhci host and causes USB3 devices to receive control
2601 * commands in the default state. This has been seen to cause
2602 * enumeration failures, so disable this enumeration scheme for USB3
2605 static bool use_new_scheme(struct usb_device *udev, int retry)
2607 if (udev->speed >= USB_SPEED_SUPER)
2610 return USE_NEW_SCHEME(retry);
2613 /* Is a USB 3.0 port in the Inactive or Compliance Mode state?
2614 * Port worm reset is required to recover
2616 static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1,
2621 if (!hub_is_superspeed(hub->hdev))
2624 if (test_bit(port1, hub->warm_reset_bits))
2627 link_state = portstatus & USB_PORT_STAT_LINK_STATE;
2628 return link_state == USB_SS_PORT_LS_SS_INACTIVE
2629 || link_state == USB_SS_PORT_LS_COMP_MOD;
2632 static int hub_port_wait_reset(struct usb_hub *hub, int port1,
2633 struct usb_device *udev, unsigned int delay, bool warm)
2635 int delay_time, ret;
2638 u32 ext_portstatus = 0;
2640 for (delay_time = 0;
2641 delay_time < HUB_RESET_TIMEOUT;
2642 delay_time += delay) {
2643 /* wait to give the device a chance to reset */
2646 /* read and decode port status */
2647 if (hub_is_superspeedplus(hub->hdev))
2648 ret = hub_ext_port_status(hub, port1,
2649 HUB_EXT_PORT_STATUS,
2650 &portstatus, &portchange,
2653 ret = hub_port_status(hub, port1, &portstatus,
2659 * The port state is unknown until the reset completes.
2661 * On top of that, some chips may require additional time
2662 * to re-establish a connection after the reset is complete,
2663 * so also wait for the connection to be re-established.
2665 if (!(portstatus & USB_PORT_STAT_RESET) &&
2666 (portstatus & USB_PORT_STAT_CONNECTION))
2669 /* switch to the long delay after two short delay failures */
2670 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
2671 delay = HUB_LONG_RESET_TIME;
2673 dev_dbg(&hub->ports[port1 - 1]->dev,
2674 "not %sreset yet, waiting %dms\n",
2675 warm ? "warm " : "", delay);
2678 if ((portstatus & USB_PORT_STAT_RESET))
2681 if (hub_port_warm_reset_required(hub, port1, portstatus))
2684 /* Device went away? */
2685 if (!(portstatus & USB_PORT_STAT_CONNECTION))
2688 /* bomb out completely if the connection bounced. A USB 3.0
2689 * connection may bounce if multiple warm resets were issued,
2690 * but the device may have successfully re-connected. Ignore it.
2692 if (!hub_is_superspeed(hub->hdev) &&
2693 (portchange & USB_PORT_STAT_C_CONNECTION))
2696 if (!(portstatus & USB_PORT_STAT_ENABLE))
2702 if (hub_is_wusb(hub))
2703 udev->speed = USB_SPEED_WIRELESS;
2704 else if (hub_is_superspeedplus(hub->hdev) &&
2705 port_speed_is_ssp(hub->hdev, ext_portstatus &
2706 USB_EXT_PORT_STAT_RX_SPEED_ID))
2707 udev->speed = USB_SPEED_SUPER_PLUS;
2708 else if (hub_is_superspeed(hub->hdev))
2709 udev->speed = USB_SPEED_SUPER;
2710 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
2711 udev->speed = USB_SPEED_HIGH;
2712 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
2713 udev->speed = USB_SPEED_LOW;
2715 udev->speed = USB_SPEED_FULL;
2719 /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
2720 static int hub_port_reset(struct usb_hub *hub, int port1,
2721 struct usb_device *udev, unsigned int delay, bool warm)
2724 u16 portchange, portstatus;
2725 struct usb_port *port_dev = hub->ports[port1 - 1];
2727 if (!hub_is_superspeed(hub->hdev)) {
2729 dev_err(hub->intfdev, "only USB3 hub support "
2733 /* Block EHCI CF initialization during the port reset.
2734 * Some companion controllers don't like it when they mix.
2736 down_read(&ehci_cf_port_reset_rwsem);
2739 * If the caller hasn't explicitly requested a warm reset,
2740 * double check and see if one is needed.
2742 if (hub_port_status(hub, port1, &portstatus, &portchange) == 0)
2743 if (hub_port_warm_reset_required(hub, port1,
2747 clear_bit(port1, hub->warm_reset_bits);
2749 /* Reset the port */
2750 for (i = 0; i < PORT_RESET_TRIES; i++) {
2751 status = set_port_feature(hub->hdev, port1, (warm ?
2752 USB_PORT_FEAT_BH_PORT_RESET :
2753 USB_PORT_FEAT_RESET));
2754 if (status == -ENODEV) {
2755 ; /* The hub is gone */
2756 } else if (status) {
2757 dev_err(&port_dev->dev,
2758 "cannot %sreset (err = %d)\n",
2759 warm ? "warm " : "", status);
2761 status = hub_port_wait_reset(hub, port1, udev, delay,
2763 if (status && status != -ENOTCONN && status != -ENODEV)
2764 dev_dbg(hub->intfdev,
2765 "port_wait_reset: err = %d\n",
2769 /* Check for disconnect or reset */
2770 if (status == 0 || status == -ENOTCONN || status == -ENODEV) {
2771 usb_clear_port_feature(hub->hdev, port1,
2772 USB_PORT_FEAT_C_RESET);
2774 if (!hub_is_superspeed(hub->hdev))
2777 usb_clear_port_feature(hub->hdev, port1,
2778 USB_PORT_FEAT_C_BH_PORT_RESET);
2779 usb_clear_port_feature(hub->hdev, port1,
2780 USB_PORT_FEAT_C_PORT_LINK_STATE);
2781 usb_clear_port_feature(hub->hdev, port1,
2782 USB_PORT_FEAT_C_CONNECTION);
2785 * If a USB 3.0 device migrates from reset to an error
2786 * state, re-issue the warm reset.
2788 if (hub_port_status(hub, port1,
2789 &portstatus, &portchange) < 0)
2792 if (!hub_port_warm_reset_required(hub, port1,
2797 * If the port is in SS.Inactive or Compliance Mode, the
2798 * hot or warm reset failed. Try another warm reset.
2801 dev_dbg(&port_dev->dev,
2802 "hot reset failed, warm reset\n");
2807 dev_dbg(&port_dev->dev,
2808 "not enabled, trying %sreset again...\n",
2809 warm ? "warm " : "");
2810 delay = HUB_LONG_RESET_TIME;
2813 dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n");
2817 /* TRSTRCY = 10 ms; plus some extra */
2820 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2822 update_devnum(udev, 0);
2823 /* The xHC may think the device is already reset,
2824 * so ignore the status.
2826 if (hcd->driver->reset_device)
2827 hcd->driver->reset_device(hcd, udev);
2829 usb_set_device_state(udev, USB_STATE_DEFAULT);
2833 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
2836 if (!hub_is_superspeed(hub->hdev))
2837 up_read(&ehci_cf_port_reset_rwsem);
2842 /* Check if a port is power on */
2843 static int port_is_power_on(struct usb_hub *hub, unsigned portstatus)
2847 if (hub_is_superspeed(hub->hdev)) {
2848 if (portstatus & USB_SS_PORT_STAT_POWER)
2851 if (portstatus & USB_PORT_STAT_POWER)
2858 static void usb_lock_port(struct usb_port *port_dev)
2859 __acquires(&port_dev->status_lock)
2861 mutex_lock(&port_dev->status_lock);
2862 __acquire(&port_dev->status_lock);
2865 static void usb_unlock_port(struct usb_port *port_dev)
2866 __releases(&port_dev->status_lock)
2868 mutex_unlock(&port_dev->status_lock);
2869 __release(&port_dev->status_lock);
2874 /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
2875 static int port_is_suspended(struct usb_hub *hub, unsigned portstatus)
2879 if (hub_is_superspeed(hub->hdev)) {
2880 if ((portstatus & USB_PORT_STAT_LINK_STATE)
2881 == USB_SS_PORT_LS_U3)
2884 if (portstatus & USB_PORT_STAT_SUSPEND)
2891 /* Determine whether the device on a port is ready for a normal resume,
2892 * is ready for a reset-resume, or should be disconnected.
2894 static int check_port_resume_type(struct usb_device *udev,
2895 struct usb_hub *hub, int port1,
2896 int status, u16 portchange, u16 portstatus)
2898 struct usb_port *port_dev = hub->ports[port1 - 1];
2902 /* Is a warm reset needed to recover the connection? */
2903 if (status == 0 && udev->reset_resume
2904 && hub_port_warm_reset_required(hub, port1, portstatus)) {
2907 /* Is the device still present? */
2908 else if (status || port_is_suspended(hub, portstatus) ||
2909 !port_is_power_on(hub, portstatus)) {
2912 } else if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2914 usleep_range(200, 300);
2915 status = hub_port_status(hub, port1, &portstatus,
2922 /* Can't do a normal resume if the port isn't enabled,
2923 * so try a reset-resume instead.
2925 else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) {
2926 if (udev->persist_enabled)
2927 udev->reset_resume = 1;
2933 dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n",
2934 portchange, portstatus, status);
2935 } else if (udev->reset_resume) {
2937 /* Late port handoff can set status-change bits */
2938 if (portchange & USB_PORT_STAT_C_CONNECTION)
2939 usb_clear_port_feature(hub->hdev, port1,
2940 USB_PORT_FEAT_C_CONNECTION);
2941 if (portchange & USB_PORT_STAT_C_ENABLE)
2942 usb_clear_port_feature(hub->hdev, port1,
2943 USB_PORT_FEAT_C_ENABLE);
2949 int usb_disable_ltm(struct usb_device *udev)
2951 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2953 /* Check if the roothub and device supports LTM. */
2954 if (!usb_device_supports_ltm(hcd->self.root_hub) ||
2955 !usb_device_supports_ltm(udev))
2958 /* Clear Feature LTM Enable can only be sent if the device is
2961 if (!udev->actconfig)
2964 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2965 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
2966 USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
2967 USB_CTRL_SET_TIMEOUT);
2969 EXPORT_SYMBOL_GPL(usb_disable_ltm);
2971 void usb_enable_ltm(struct usb_device *udev)
2973 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
2975 /* Check if the roothub and device supports LTM. */
2976 if (!usb_device_supports_ltm(hcd->self.root_hub) ||
2977 !usb_device_supports_ltm(udev))
2980 /* Set Feature LTM Enable can only be sent if the device is
2983 if (!udev->actconfig)
2986 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2987 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
2988 USB_DEVICE_LTM_ENABLE, 0, NULL, 0,
2989 USB_CTRL_SET_TIMEOUT);
2991 EXPORT_SYMBOL_GPL(usb_enable_ltm);
2994 * usb_enable_remote_wakeup - enable remote wakeup for a device
2995 * @udev: target device
2997 * For USB-2 devices: Set the device's remote wakeup feature.
2999 * For USB-3 devices: Assume there's only one function on the device and
3000 * enable remote wake for the first interface. FIXME if the interface
3001 * association descriptor shows there's more than one function.
3003 static int usb_enable_remote_wakeup(struct usb_device *udev)
3005 if (udev->speed < USB_SPEED_SUPER)
3006 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3007 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
3008 USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0,
3009 USB_CTRL_SET_TIMEOUT);
3011 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3012 USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE,
3013 USB_INTRF_FUNC_SUSPEND,
3014 USB_INTRF_FUNC_SUSPEND_RW |
3015 USB_INTRF_FUNC_SUSPEND_LP,
3016 NULL, 0, USB_CTRL_SET_TIMEOUT);
3020 * usb_disable_remote_wakeup - disable remote wakeup for a device
3021 * @udev: target device
3023 * For USB-2 devices: Clear the device's remote wakeup feature.
3025 * For USB-3 devices: Assume there's only one function on the device and
3026 * disable remote wake for the first interface. FIXME if the interface
3027 * association descriptor shows there's more than one function.
3029 static int usb_disable_remote_wakeup(struct usb_device *udev)
3031 if (udev->speed < USB_SPEED_SUPER)
3032 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3033 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
3034 USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0,
3035 USB_CTRL_SET_TIMEOUT);
3037 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3038 USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE,
3039 USB_INTRF_FUNC_SUSPEND, 0, NULL, 0,
3040 USB_CTRL_SET_TIMEOUT);
3043 /* Count of wakeup-enabled devices at or below udev */
3044 static unsigned wakeup_enabled_descendants(struct usb_device *udev)
3046 struct usb_hub *hub = usb_hub_to_struct_hub(udev);
3048 return udev->do_remote_wakeup +
3049 (hub ? hub->wakeup_enabled_descendants : 0);
3053 * usb_port_suspend - suspend a usb device's upstream port
3054 * @udev: device that's no longer in active use, not a root hub
3055 * Context: must be able to sleep; device not locked; pm locks held
3057 * Suspends a USB device that isn't in active use, conserving power.
3058 * Devices may wake out of a suspend, if anything important happens,
3059 * using the remote wakeup mechanism. They may also be taken out of
3060 * suspend by the host, using usb_port_resume(). It's also routine
3061 * to disconnect devices while they are suspended.
3063 * This only affects the USB hardware for a device; its interfaces
3064 * (and, for hubs, child devices) must already have been suspended.
3066 * Selective port suspend reduces power; most suspended devices draw
3067 * less than 500 uA. It's also used in OTG, along with remote wakeup.
3068 * All devices below the suspended port are also suspended.
3070 * Devices leave suspend state when the host wakes them up. Some devices
3071 * also support "remote wakeup", where the device can activate the USB
3072 * tree above them to deliver data, such as a keypress or packet. In
3073 * some cases, this wakes the USB host.
3075 * Suspending OTG devices may trigger HNP, if that's been enabled
3076 * between a pair of dual-role devices. That will change roles, such
3077 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
3079 * Devices on USB hub ports have only one "suspend" state, corresponding
3080 * to ACPI D2, "may cause the device to lose some context".
3081 * State transitions include:
3083 * - suspend, resume ... when the VBUS power link stays live
3084 * - suspend, disconnect ... VBUS lost
3086 * Once VBUS drop breaks the circuit, the port it's using has to go through
3087 * normal re-enumeration procedures, starting with enabling VBUS power.
3088 * Other than re-initializing the hub (plug/unplug, except for root hubs),
3089 * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq
3090 * timer, no SRP, no requests through sysfs.
3092 * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get
3093 * suspended until their bus goes into global suspend (i.e., the root
3094 * hub is suspended). Nevertheless, we change @udev->state to
3095 * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual
3096 * upstream port setting is stored in @udev->port_is_suspended.
3098 * Returns 0 on success, else negative errno.
3100 int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
3102 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
3103 struct usb_port *port_dev = hub->ports[udev->portnum - 1];
3104 int port1 = udev->portnum;
3106 bool really_suspend = true;
3108 usb_lock_port(port_dev);
3110 /* enable remote wakeup when appropriate; this lets the device
3111 * wake up the upstream hub (including maybe the root hub).
3113 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
3114 * we don't explicitly enable it here.
3116 if (udev->do_remote_wakeup) {
3117 status = usb_enable_remote_wakeup(udev);
3119 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
3121 /* bail if autosuspend is requested */
3122 if (PMSG_IS_AUTO(msg))
3127 /* disable USB2 hardware LPM */
3128 if (udev->usb2_hw_lpm_enabled == 1)
3129 usb_set_usb2_hardware_lpm(udev, 0);
3131 if (usb_disable_ltm(udev)) {
3132 dev_err(&udev->dev, "Failed to disable LTM before suspend\n.");
3134 if (PMSG_IS_AUTO(msg))
3137 if (usb_unlocked_disable_lpm(udev)) {
3138 dev_err(&udev->dev, "Failed to disable LPM before suspend\n.");
3140 if (PMSG_IS_AUTO(msg))
3145 if (hub_is_superspeed(hub->hdev))
3146 status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3);
3149 * For system suspend, we do not need to enable the suspend feature
3150 * on individual USB-2 ports. The devices will automatically go
3151 * into suspend a few ms after the root hub stops sending packets.
3152 * The USB 2.0 spec calls this "global suspend".
3154 * However, many USB hubs have a bug: They don't relay wakeup requests
3155 * from a downstream port if the port's suspend feature isn't on.
3156 * Therefore we will turn on the suspend feature if udev or any of its
3157 * descendants is enabled for remote wakeup.
3159 else if (PMSG_IS_AUTO(msg) || wakeup_enabled_descendants(udev) > 0)
3160 status = set_port_feature(hub->hdev, port1,
3161 USB_PORT_FEAT_SUSPEND);
3163 really_suspend = false;
3167 dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status);
3169 /* Try to enable USB3 LPM and LTM again */
3170 usb_unlocked_enable_lpm(udev);
3172 usb_enable_ltm(udev);
3174 /* Try to enable USB2 hardware LPM again */
3175 if (udev->usb2_hw_lpm_capable == 1)
3176 usb_set_usb2_hardware_lpm(udev, 1);
3178 if (udev->do_remote_wakeup)
3179 (void) usb_disable_remote_wakeup(udev);
3182 /* System sleep transitions should never fail */
3183 if (!PMSG_IS_AUTO(msg))
3186 dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
3187 (PMSG_IS_AUTO(msg) ? "auto-" : ""),
3188 udev->do_remote_wakeup);
3189 if (really_suspend) {
3190 udev->port_is_suspended = 1;
3192 /* device has up to 10 msec to fully suspend */
3195 usb_set_device_state(udev, USB_STATE_SUSPENDED);
3198 if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled
3199 && test_and_clear_bit(port1, hub->child_usage_bits))
3200 pm_runtime_put_sync(&port_dev->dev);
3202 usb_mark_last_busy(hub->hdev);
3204 usb_unlock_port(port_dev);
3209 * If the USB "suspend" state is in use (rather than "global suspend"),
3210 * many devices will be individually taken out of suspend state using
3211 * special "resume" signaling. This routine kicks in shortly after
3212 * hardware resume signaling is finished, either because of selective
3213 * resume (by host) or remote wakeup (by device) ... now see what changed
3214 * in the tree that's rooted at this device.
3216 * If @udev->reset_resume is set then the device is reset before the
3217 * status check is done.
3219 static int finish_port_resume(struct usb_device *udev)
3224 /* caller owns the udev device lock */
3225 dev_dbg(&udev->dev, "%s\n",
3226 udev->reset_resume ? "finish reset-resume" : "finish resume");
3228 /* usb ch9 identifies four variants of SUSPENDED, based on what
3229 * state the device resumes to. Linux currently won't see the
3230 * first two on the host side; they'd be inside hub_port_init()
3231 * during many timeouts, but hub_wq can't suspend until later.
3233 usb_set_device_state(udev, udev->actconfig
3234 ? USB_STATE_CONFIGURED
3235 : USB_STATE_ADDRESS);
3237 /* 10.5.4.5 says not to reset a suspended port if the attached
3238 * device is enabled for remote wakeup. Hence the reset
3239 * operation is carried out here, after the port has been
3242 if (udev->reset_resume) {
3244 * If the device morphs or switches modes when it is reset,
3245 * we don't want to perform a reset-resume. We'll fail the
3246 * resume, which will cause a logical disconnect, and then
3247 * the device will be rediscovered.
3250 if (udev->quirks & USB_QUIRK_RESET)
3253 status = usb_reset_and_verify_device(udev);
3256 /* 10.5.4.5 says be sure devices in the tree are still there.
3257 * For now let's assume the device didn't go crazy on resume,
3258 * and device drivers will know about any resume quirks.
3262 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
3264 /* If a normal resume failed, try doing a reset-resume */
3265 if (status && !udev->reset_resume && udev->persist_enabled) {
3266 dev_dbg(&udev->dev, "retry with reset-resume\n");
3267 udev->reset_resume = 1;
3268 goto retry_reset_resume;
3273 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
3276 * There are a few quirky devices which violate the standard
3277 * by claiming to have remote wakeup enabled after a reset,
3278 * which crash if the feature is cleared, hence check for
3279 * udev->reset_resume
3281 } else if (udev->actconfig && !udev->reset_resume) {
3282 if (udev->speed < USB_SPEED_SUPER) {
3283 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
3284 status = usb_disable_remote_wakeup(udev);
3286 status = usb_get_status(udev, USB_RECIP_INTERFACE, 0,
3288 if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP
3289 | USB_INTRF_STAT_FUNC_RW))
3290 status = usb_disable_remote_wakeup(udev);
3295 "disable remote wakeup, status %d\n",
3303 * There are some SS USB devices which take longer time for link training.
3304 * XHCI specs 4.19.4 says that when Link training is successful, port
3305 * sets CCS bit to 1. So if SW reads port status before successful link
3306 * training, then it will not find device to be present.
3307 * USB Analyzer log with such buggy devices show that in some cases
3308 * device switch on the RX termination after long delay of host enabling
3309 * the VBUS. In few other cases it has been seen that device fails to
3310 * negotiate link training in first attempt. It has been
3311 * reported till now that few devices take as long as 2000 ms to train
3312 * the link after host enabling its VBUS and termination. Following
3313 * routine implements a 2000 ms timeout for link training. If in a case
3314 * link trains before timeout, loop will exit earlier.
3316 * There are also some 2.0 hard drive based devices and 3.0 thumb
3317 * drives that, when plugged into a 2.0 only port, take a long
3318 * time to set CCS after VBUS enable.
3320 * FIXME: If a device was connected before suspend, but was removed
3321 * while system was asleep, then the loop in the following routine will
3322 * only exit at timeout.
3324 * This routine should only be called when persist is enabled.
3326 static int wait_for_connected(struct usb_device *udev,
3327 struct usb_hub *hub, int *port1,
3328 u16 *portchange, u16 *portstatus)
3330 int status = 0, delay_ms = 0;
3332 while (delay_ms < 2000) {
3333 if (status || *portstatus & USB_PORT_STAT_CONNECTION)
3337 status = hub_port_status(hub, *port1, portstatus, portchange);
3339 dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms);
3344 * usb_port_resume - re-activate a suspended usb device's upstream port
3345 * @udev: device to re-activate, not a root hub
3346 * Context: must be able to sleep; device not locked; pm locks held
3348 * This will re-activate the suspended device, increasing power usage
3349 * while letting drivers communicate again with its endpoints.
3350 * USB resume explicitly guarantees that the power session between
3351 * the host and the device is the same as it was when the device
3354 * If @udev->reset_resume is set then this routine won't check that the
3355 * port is still enabled. Furthermore, finish_port_resume() above will
3356 * reset @udev. The end result is that a broken power session can be
3357 * recovered and @udev will appear to persist across a loss of VBUS power.
3359 * For example, if a host controller doesn't maintain VBUS suspend current
3360 * during a system sleep or is reset when the system wakes up, all the USB
3361 * power sessions below it will be broken. This is especially troublesome
3362 * for mass-storage devices containing mounted filesystems, since the
3363 * device will appear to have disconnected and all the memory mappings
3364 * to it will be lost. Using the USB_PERSIST facility, the device can be
3365 * made to appear as if it had not disconnected.
3367 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
3368 * every effort to insure that the same device is present after the
3369 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
3370 * quite possible for a device to remain unaltered but its media to be
3371 * changed. If the user replaces a flash memory card while the system is
3372 * asleep, he will have only himself to blame when the filesystem on the
3373 * new card is corrupted and the system crashes.
3375 * Returns 0 on success, else negative errno.
3377 int usb_port_resume(struct usb_device *udev, pm_message_t msg)
3379 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
3380 struct usb_port *port_dev = hub->ports[udev->portnum - 1];
3381 int port1 = udev->portnum;
3383 u16 portchange, portstatus;
3385 if (!test_and_set_bit(port1, hub->child_usage_bits)) {
3386 status = pm_runtime_get_sync(&port_dev->dev);
3388 dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
3394 usb_lock_port(port_dev);
3396 /* Skip the initial Clear-Suspend step for a remote wakeup */
3397 status = hub_port_status(hub, port1, &portstatus, &portchange);
3398 if (status == 0 && !port_is_suspended(hub, portstatus))
3399 goto SuspendCleared;
3401 /* see 7.1.7.7; affects power usage, but not budgeting */
3402 if (hub_is_superspeed(hub->hdev))
3403 status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0);
3405 status = usb_clear_port_feature(hub->hdev,
3406 port1, USB_PORT_FEAT_SUSPEND);
3408 dev_dbg(&port_dev->dev, "can't resume, status %d\n", status);
3410 /* drive resume for USB_RESUME_TIMEOUT msec */
3411 dev_dbg(&udev->dev, "usb %sresume\n",
3412 (PMSG_IS_AUTO(msg) ? "auto-" : ""));
3413 msleep(USB_RESUME_TIMEOUT);
3415 /* Virtual root hubs can trigger on GET_PORT_STATUS to
3416 * stop resume signaling. Then finish the resume
3419 status = hub_port_status(hub, port1, &portstatus, &portchange);
3421 /* TRSMRCY = 10 msec */
3427 udev->port_is_suspended = 0;
3428 if (hub_is_superspeed(hub->hdev)) {
3429 if (portchange & USB_PORT_STAT_C_LINK_STATE)
3430 usb_clear_port_feature(hub->hdev, port1,
3431 USB_PORT_FEAT_C_PORT_LINK_STATE);
3433 if (portchange & USB_PORT_STAT_C_SUSPEND)
3434 usb_clear_port_feature(hub->hdev, port1,
3435 USB_PORT_FEAT_C_SUSPEND);
3439 if (udev->persist_enabled)
3440 status = wait_for_connected(udev, hub, &port1, &portchange,
3443 status = check_port_resume_type(udev,
3444 hub, port1, status, portchange, portstatus);
3446 status = finish_port_resume(udev);
3448 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
3449 hub_port_logical_disconnect(hub, port1);
3451 /* Try to enable USB2 hardware LPM */
3452 if (udev->usb2_hw_lpm_capable == 1)
3453 usb_set_usb2_hardware_lpm(udev, 1);
3455 /* Try to enable USB3 LTM and LPM */
3456 usb_enable_ltm(udev);
3457 usb_unlocked_enable_lpm(udev);
3460 usb_unlock_port(port_dev);
3465 int usb_remote_wakeup(struct usb_device *udev)
3469 usb_lock_device(udev);
3470 if (udev->state == USB_STATE_SUSPENDED) {
3471 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
3472 status = usb_autoresume_device(udev);
3474 /* Let the drivers do their thing, then... */
3475 usb_autosuspend_device(udev);
3478 usb_unlock_device(udev);
3482 /* Returns 1 if there was a remote wakeup and a connect status change. */
3483 static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
3484 u16 portstatus, u16 portchange)
3485 __must_hold(&port_dev->status_lock)
3487 struct usb_port *port_dev = hub->ports[port - 1];
3488 struct usb_device *hdev;
3489 struct usb_device *udev;
3490 int connect_change = 0;
3494 udev = port_dev->child;
3495 if (!hub_is_superspeed(hdev)) {
3496 if (!(portchange & USB_PORT_STAT_C_SUSPEND))
3498 usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND);
3500 if (!udev || udev->state != USB_STATE_SUSPENDED ||
3501 (portstatus & USB_PORT_STAT_LINK_STATE) !=
3507 /* TRSMRCY = 10 msec */
3510 usb_unlock_port(port_dev);
3511 ret = usb_remote_wakeup(udev);
3512 usb_lock_port(port_dev);
3517 hub_port_disable(hub, port, 1);
3519 dev_dbg(&port_dev->dev, "resume, status %d\n", ret);
3520 return connect_change;
3523 static int check_ports_changed(struct usb_hub *hub)
3527 for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) {
3528 u16 portstatus, portchange;
3531 status = hub_port_status(hub, port1, &portstatus, &portchange);
3532 if (!status && portchange)
3538 static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
3540 struct usb_hub *hub = usb_get_intfdata(intf);
3541 struct usb_device *hdev = hub->hdev;
3546 * Warn if children aren't already suspended.
3547 * Also, add up the number of wakeup-enabled descendants.
3549 hub->wakeup_enabled_descendants = 0;
3550 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
3551 struct usb_port *port_dev = hub->ports[port1 - 1];
3552 struct usb_device *udev = port_dev->child;
3554 if (udev && udev->can_submit) {
3555 dev_warn(&port_dev->dev, "device %s not suspended yet\n",
3556 dev_name(&udev->dev));
3557 if (PMSG_IS_AUTO(msg))
3561 hub->wakeup_enabled_descendants +=
3562 wakeup_enabled_descendants(udev);
3565 if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) {
3566 /* check if there are changes pending on hub ports */
3567 if (check_ports_changed(hub)) {
3568 if (PMSG_IS_AUTO(msg))
3570 pm_wakeup_event(&hdev->dev, 2000);
3574 if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) {
3575 /* Enable hub to send remote wakeup for all ports. */
3576 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
3577 status = set_port_feature(hdev,
3579 USB_PORT_FEAT_REMOTE_WAKE_CONNECT |
3580 USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT |
3581 USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT,
3582 USB_PORT_FEAT_REMOTE_WAKE_MASK);
3586 dev_dbg(&intf->dev, "%s\n", __func__);
3588 /* stop hub_wq and related activity */
3589 hub_quiesce(hub, HUB_SUSPEND);
3593 static int hub_resume(struct usb_interface *intf)
3595 struct usb_hub *hub = usb_get_intfdata(intf);
3597 dev_dbg(&intf->dev, "%s\n", __func__);
3598 hub_activate(hub, HUB_RESUME);
3602 static int hub_reset_resume(struct usb_interface *intf)
3604 struct usb_hub *hub = usb_get_intfdata(intf);
3606 dev_dbg(&intf->dev, "%s\n", __func__);
3607 hub_activate(hub, HUB_RESET_RESUME);
3612 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
3613 * @rhdev: struct usb_device for the root hub
3615 * The USB host controller driver calls this function when its root hub
3616 * is resumed and Vbus power has been interrupted or the controller
3617 * has been reset. The routine marks @rhdev as having lost power.
3618 * When the hub driver is resumed it will take notice and carry out
3619 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
3620 * the others will be disconnected.
3622 void usb_root_hub_lost_power(struct usb_device *rhdev)
3624 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
3625 rhdev->reset_resume = 1;
3627 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
3629 static const char * const usb3_lpm_names[] = {
3637 * Send a Set SEL control transfer to the device, prior to enabling
3638 * device-initiated U1 or U2. This lets the device know the exit latencies from
3639 * the time the device initiates a U1 or U2 exit, to the time it will receive a
3640 * packet from the host.
3642 * This function will fail if the SEL or PEL values for udev are greater than
3643 * the maximum allowed values for the link state to be enabled.
3645 static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state)
3647 struct usb_set_sel_req *sel_values;
3648 unsigned long long u1_sel;
3649 unsigned long long u1_pel;
3650 unsigned long long u2_sel;
3651 unsigned long long u2_pel;
3654 if (udev->state != USB_STATE_CONFIGURED)
3657 /* Convert SEL and PEL stored in ns to us */
3658 u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000);
3659 u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000);
3660 u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000);
3661 u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000);
3664 * Make sure that the calculated SEL and PEL values for the link
3665 * state we're enabling aren't bigger than the max SEL/PEL
3666 * value that will fit in the SET SEL control transfer.
3667 * Otherwise the device would get an incorrect idea of the exit
3668 * latency for the link state, and could start a device-initiated
3669 * U1/U2 when the exit latencies are too high.
3671 if ((state == USB3_LPM_U1 &&
3672 (u1_sel > USB3_LPM_MAX_U1_SEL_PEL ||
3673 u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) ||
3674 (state == USB3_LPM_U2 &&
3675 (u2_sel > USB3_LPM_MAX_U2_SEL_PEL ||
3676 u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) {
3677 dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n",
3678 usb3_lpm_names[state], u1_sel, u1_pel);
3683 * If we're enabling device-initiated LPM for one link state,
3684 * but the other link state has a too high SEL or PEL value,
3685 * just set those values to the max in the Set SEL request.
3687 if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL)
3688 u1_sel = USB3_LPM_MAX_U1_SEL_PEL;
3690 if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL)
3691 u1_pel = USB3_LPM_MAX_U1_SEL_PEL;
3693 if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL)
3694 u2_sel = USB3_LPM_MAX_U2_SEL_PEL;
3696 if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL)
3697 u2_pel = USB3_LPM_MAX_U2_SEL_PEL;
3700 * usb_enable_lpm() can be called as part of a failed device reset,
3701 * which may be initiated by an error path of a mass storage driver.
3702 * Therefore, use GFP_NOIO.
3704 sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO);
3708 sel_values->u1_sel = u1_sel;
3709 sel_values->u1_pel = u1_pel;
3710 sel_values->u2_sel = cpu_to_le16(u2_sel);
3711 sel_values->u2_pel = cpu_to_le16(u2_pel);
3713 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3717 sel_values, sizeof *(sel_values),
3718 USB_CTRL_SET_TIMEOUT);
3724 * Enable or disable device-initiated U1 or U2 transitions.
3726 static int usb_set_device_initiated_lpm(struct usb_device *udev,
3727 enum usb3_link_state state, bool enable)
3734 feature = USB_DEVICE_U1_ENABLE;
3737 feature = USB_DEVICE_U2_ENABLE;
3740 dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n",
3741 __func__, enable ? "enable" : "disable");
3745 if (udev->state != USB_STATE_CONFIGURED) {
3746 dev_dbg(&udev->dev, "%s: Can't %s %s state "
3747 "for unconfigured device.\n",
3748 __func__, enable ? "enable" : "disable",
3749 usb3_lpm_names[state]);
3755 * Now send the control transfer to enable device-initiated LPM
3756 * for either U1 or U2.
3758 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3759 USB_REQ_SET_FEATURE,
3763 USB_CTRL_SET_TIMEOUT);
3765 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
3766 USB_REQ_CLEAR_FEATURE,
3770 USB_CTRL_SET_TIMEOUT);
3773 dev_warn(&udev->dev, "%s of device-initiated %s failed.\n",
3774 enable ? "Enable" : "Disable",
3775 usb3_lpm_names[state]);
3781 static int usb_set_lpm_timeout(struct usb_device *udev,
3782 enum usb3_link_state state, int timeout)
3789 feature = USB_PORT_FEAT_U1_TIMEOUT;
3792 feature = USB_PORT_FEAT_U2_TIMEOUT;
3795 dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n",
3800 if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT &&
3801 timeout != USB3_LPM_DEVICE_INITIATED) {
3802 dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, "
3803 "which is a reserved value.\n",
3804 usb3_lpm_names[state], timeout);
3808 ret = set_port_feature(udev->parent,
3809 USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum,
3812 dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x,"
3813 "error code %i\n", usb3_lpm_names[state],
3817 if (state == USB3_LPM_U1)
3818 udev->u1_params.timeout = timeout;
3820 udev->u2_params.timeout = timeout;
3825 * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
3828 * We will attempt to enable U1 or U2, but there are no guarantees that the
3829 * control transfers to set the hub timeout or enable device-initiated U1/U2
3830 * will be successful.
3832 * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
3833 * driver know about it. If that call fails, it should be harmless, and just
3834 * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
3836 static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
3837 enum usb3_link_state state)
3840 __u8 u1_mel = udev->bos->ss_cap->bU1devExitLat;
3841 __le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat;
3843 /* If the device says it doesn't have *any* exit latency to come out of
3844 * U1 or U2, it's probably lying. Assume it doesn't implement that link
3847 if ((state == USB3_LPM_U1 && u1_mel == 0) ||
3848 (state == USB3_LPM_U2 && u2_mel == 0))
3852 * First, let the device know about the exit latencies
3853 * associated with the link state we're about to enable.
3855 ret = usb_req_set_sel(udev, state);
3857 dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n",
3858 usb3_lpm_names[state]);
3862 /* We allow the host controller to set the U1/U2 timeout internally
3863 * first, so that it can change its schedule to account for the
3864 * additional latency to send data to a device in a lower power
3867 timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state);
3869 /* xHCI host controller doesn't want to enable this LPM state. */
3874 dev_warn(&udev->dev, "Could not enable %s link state, "
3875 "xHCI error %i.\n", usb3_lpm_names[state],
3880 if (usb_set_lpm_timeout(udev, state, timeout)) {
3881 /* If we can't set the parent hub U1/U2 timeout,
3882 * device-initiated LPM won't be allowed either, so let the xHCI
3883 * host know that this link state won't be enabled.
3885 hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
3887 /* Only a configured device will accept the Set Feature
3890 if (udev->actconfig)
3891 usb_set_device_initiated_lpm(udev, state, true);
3893 /* As soon as usb_set_lpm_timeout(timeout) returns 0, the
3894 * hub-initiated LPM is enabled. Thus, LPM is enabled no
3895 * matter the result of usb_set_device_initiated_lpm().
3896 * The only difference is whether device is able to initiate
3899 if (state == USB3_LPM_U1)
3900 udev->usb3_lpm_u1_enabled = 1;
3901 else if (state == USB3_LPM_U2)
3902 udev->usb3_lpm_u2_enabled = 1;
3907 * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
3910 * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
3911 * If zero is returned, the parent will not allow the link to go into U1/U2.
3913 * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
3914 * it won't have an effect on the bus link state because the parent hub will
3915 * still disallow device-initiated U1/U2 entry.
3917 * If zero is returned, the xHCI host controller may still think U1/U2 entry is
3918 * possible. The result will be slightly more bus bandwidth will be taken up
3919 * (to account for U1/U2 exit latency), but it should be harmless.
3921 static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
3922 enum usb3_link_state state)
3929 dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n",
3934 if (usb_set_lpm_timeout(udev, state, 0))
3937 usb_set_device_initiated_lpm(udev, state, false);
3939 if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state))
3940 dev_warn(&udev->dev, "Could not disable xHCI %s timeout, "
3941 "bus schedule bandwidth may be impacted.\n",
3942 usb3_lpm_names[state]);
3944 /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM
3945 * is disabled. Hub will disallows link to enter U1/U2 as well,
3946 * even device is initiating LPM. Hence LPM is disabled if hub LPM
3947 * timeout set to 0, no matter device-initiated LPM is disabled or
3950 if (state == USB3_LPM_U1)
3951 udev->usb3_lpm_u1_enabled = 0;
3952 else if (state == USB3_LPM_U2)
3953 udev->usb3_lpm_u2_enabled = 0;
3959 * Disable hub-initiated and device-initiated U1 and U2 entry.
3960 * Caller must own the bandwidth_mutex.
3962 * This will call usb_enable_lpm() on failure, which will decrement
3963 * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
3965 int usb_disable_lpm(struct usb_device *udev)
3967 struct usb_hcd *hcd;
3969 if (!udev || !udev->parent ||
3970 udev->speed < USB_SPEED_SUPER ||
3971 !udev->lpm_capable ||
3972 udev->state < USB_STATE_DEFAULT)
3975 hcd = bus_to_hcd(udev->bus);
3976 if (!hcd || !hcd->driver->disable_usb3_lpm_timeout)
3979 udev->lpm_disable_count++;
3980 if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0))
3983 /* If LPM is enabled, attempt to disable it. */
3984 if (usb_disable_link_state(hcd, udev, USB3_LPM_U1))
3986 if (usb_disable_link_state(hcd, udev, USB3_LPM_U2))
3992 usb_enable_lpm(udev);
3995 EXPORT_SYMBOL_GPL(usb_disable_lpm);
3997 /* Grab the bandwidth_mutex before calling usb_disable_lpm() */
3998 int usb_unlocked_disable_lpm(struct usb_device *udev)
4000 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4006 mutex_lock(hcd->bandwidth_mutex);
4007 ret = usb_disable_lpm(udev);
4008 mutex_unlock(hcd->bandwidth_mutex);
4012 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
4015 * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
4016 * xHCI host policy may prevent U1 or U2 from being enabled.
4018 * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
4019 * until the lpm_disable_count drops to zero. Caller must own the
4022 void usb_enable_lpm(struct usb_device *udev)
4024 struct usb_hcd *hcd;
4025 struct usb_hub *hub;
4026 struct usb_port *port_dev;
4028 if (!udev || !udev->parent ||
4029 udev->speed < USB_SPEED_SUPER ||
4030 !udev->lpm_capable ||
4031 udev->state < USB_STATE_DEFAULT)
4034 udev->lpm_disable_count--;
4035 hcd = bus_to_hcd(udev->bus);
4036 /* Double check that we can both enable and disable LPM.
4037 * Device must be configured to accept set feature U1/U2 timeout.
4039 if (!hcd || !hcd->driver->enable_usb3_lpm_timeout ||
4040 !hcd->driver->disable_usb3_lpm_timeout)
4043 if (udev->lpm_disable_count > 0)
4046 hub = usb_hub_to_struct_hub(udev->parent);
4050 port_dev = hub->ports[udev->portnum - 1];
4052 if (port_dev->usb3_lpm_u1_permit)
4053 usb_enable_link_state(hcd, udev, USB3_LPM_U1);
4055 if (port_dev->usb3_lpm_u2_permit)
4056 usb_enable_link_state(hcd, udev, USB3_LPM_U2);
4058 EXPORT_SYMBOL_GPL(usb_enable_lpm);
4060 /* Grab the bandwidth_mutex before calling usb_enable_lpm() */
4061 void usb_unlocked_enable_lpm(struct usb_device *udev)
4063 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4068 mutex_lock(hcd->bandwidth_mutex);
4069 usb_enable_lpm(udev);
4070 mutex_unlock(hcd->bandwidth_mutex);
4072 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
4074 /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */
4075 static void hub_usb3_port_prepare_disable(struct usb_hub *hub,
4076 struct usb_port *port_dev)
4078 struct usb_device *udev = port_dev->child;
4081 if (udev && udev->port_is_suspended && udev->do_remote_wakeup) {
4082 ret = hub_set_port_link_state(hub, port_dev->portnum,
4085 msleep(USB_RESUME_TIMEOUT);
4086 ret = usb_disable_remote_wakeup(udev);
4089 dev_warn(&udev->dev,
4090 "Port disable: can't disable remote wake\n");
4091 udev->do_remote_wakeup = 0;
4095 #else /* CONFIG_PM */
4097 #define hub_suspend NULL
4098 #define hub_resume NULL
4099 #define hub_reset_resume NULL
4101 static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub,
4102 struct usb_port *port_dev) { }
4104 int usb_disable_lpm(struct usb_device *udev)
4108 EXPORT_SYMBOL_GPL(usb_disable_lpm);
4110 void usb_enable_lpm(struct usb_device *udev) { }
4111 EXPORT_SYMBOL_GPL(usb_enable_lpm);
4113 int usb_unlocked_disable_lpm(struct usb_device *udev)
4117 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm);
4119 void usb_unlocked_enable_lpm(struct usb_device *udev) { }
4120 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm);
4122 int usb_disable_ltm(struct usb_device *udev)
4126 EXPORT_SYMBOL_GPL(usb_disable_ltm);
4128 void usb_enable_ltm(struct usb_device *udev) { }
4129 EXPORT_SYMBOL_GPL(usb_enable_ltm);
4131 static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port,
4132 u16 portstatus, u16 portchange)
4137 #endif /* CONFIG_PM */
4140 * USB-3 does not have a similar link state as USB-2 that will avoid negotiating
4141 * a connection with a plugged-in cable but will signal the host when the cable
4142 * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices
4144 static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
4146 struct usb_port *port_dev = hub->ports[port1 - 1];
4147 struct usb_device *hdev = hub->hdev;
4151 if (hub_is_superspeed(hub->hdev)) {
4152 hub_usb3_port_prepare_disable(hub, port_dev);
4153 ret = hub_set_port_link_state(hub, port_dev->portnum,
4156 ret = usb_clear_port_feature(hdev, port1,
4157 USB_PORT_FEAT_ENABLE);
4160 if (port_dev->child && set_state)
4161 usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED);
4162 if (ret && ret != -ENODEV)
4163 dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret);
4168 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
4170 * Between connect detection and reset signaling there must be a delay
4171 * of 100ms at least for debounce and power-settling. The corresponding
4172 * timer shall restart whenever the downstream port detects a disconnect.
4174 * Apparently there are some bluetooth and irda-dongles and a number of
4175 * low-speed devices for which this debounce period may last over a second.
4176 * Not covered by the spec - but easy to deal with.
4178 * This implementation uses a 1500ms total debounce timeout; if the
4179 * connection isn't stable by then it returns -ETIMEDOUT. It checks
4180 * every 25ms for transient disconnects. When the port status has been
4181 * unchanged for 100ms it returns the port status.
4183 int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected)
4186 u16 portchange, portstatus;
4187 unsigned connection = 0xffff;
4188 int total_time, stable_time = 0;
4189 struct usb_port *port_dev = hub->ports[port1 - 1];
4191 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
4192 ret = hub_port_status(hub, port1, &portstatus, &portchange);
4196 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
4197 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
4198 if (!must_be_connected ||
4199 (connection == USB_PORT_STAT_CONNECTION))
4200 stable_time += HUB_DEBOUNCE_STEP;
4201 if (stable_time >= HUB_DEBOUNCE_STABLE)
4205 connection = portstatus & USB_PORT_STAT_CONNECTION;
4208 if (portchange & USB_PORT_STAT_C_CONNECTION) {
4209 usb_clear_port_feature(hub->hdev, port1,
4210 USB_PORT_FEAT_C_CONNECTION);
4213 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
4215 msleep(HUB_DEBOUNCE_STEP);
4218 dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n",
4219 total_time, stable_time, portstatus);
4221 if (stable_time < HUB_DEBOUNCE_STABLE)
4226 void usb_ep0_reinit(struct usb_device *udev)
4228 usb_disable_endpoint(udev, 0 + USB_DIR_IN, true);
4229 usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true);
4230 usb_enable_endpoint(udev, &udev->ep0, true);
4232 EXPORT_SYMBOL_GPL(usb_ep0_reinit);
4234 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
4235 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
4237 static int hub_set_address(struct usb_device *udev, int devnum)
4240 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4243 * The host controller will choose the device address,
4244 * instead of the core having chosen it earlier
4246 if (!hcd->driver->address_device && devnum <= 1)
4248 if (udev->state == USB_STATE_ADDRESS)
4250 if (udev->state != USB_STATE_DEFAULT)
4252 if (hcd->driver->address_device)
4253 retval = hcd->driver->address_device(hcd, udev);
4255 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
4256 USB_REQ_SET_ADDRESS, 0, devnum, 0,
4257 NULL, 0, USB_CTRL_SET_TIMEOUT);
4259 update_devnum(udev, devnum);
4260 /* Device now using proper address. */
4261 usb_set_device_state(udev, USB_STATE_ADDRESS);
4262 usb_ep0_reinit(udev);
4268 * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM
4269 * when they're plugged into a USB 2.0 port, but they don't work when LPM is
4272 * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the
4273 * device says it supports the new USB 2.0 Link PM errata by setting the BESL
4274 * support bit in the BOS descriptor.
4276 static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev)
4278 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
4279 int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
4281 if (!udev->usb2_hw_lpm_capable)
4285 connect_type = hub->ports[udev->portnum - 1]->connect_type;
4287 if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) ||
4288 connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
4289 udev->usb2_hw_lpm_allowed = 1;
4290 usb_set_usb2_hardware_lpm(udev, 1);
4294 static int hub_enable_device(struct usb_device *udev)
4296 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
4298 if (!hcd->driver->enable_device)
4300 if (udev->state == USB_STATE_ADDRESS)
4302 if (udev->state != USB_STATE_DEFAULT)
4305 return hcd->driver->enable_device(hcd, udev);
4308 /* Reset device, (re)assign address, get device descriptor.
4309 * Device connection must be stable, no more debouncing needed.
4310 * Returns device in USB_STATE_ADDRESS, except on error.
4312 * If this is called for an already-existing device (as part of
4313 * usb_reset_and_verify_device), the caller must own the device lock and
4314 * the port lock. For a newly detected device that is not accessible
4315 * through any global pointers, it's not necessary to lock the device,
4316 * but it is still necessary to lock the port.
4319 hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
4322 struct usb_device *hdev = hub->hdev;
4323 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
4324 int retries, operations, retval, i;
4325 unsigned delay = HUB_SHORT_RESET_TIME;
4326 enum usb_device_speed oldspeed = udev->speed;
4328 int devnum = udev->devnum;
4330 /* root hub ports have a slightly longer reset period
4331 * (from USB 2.0 spec, section 7.1.7.5)
4333 if (!hdev->parent) {
4334 delay = HUB_ROOT_RESET_TIME;
4335 if (port1 == hdev->bus->otg_port)
4336 hdev->bus->b_hnp_enable = 0;
4339 /* Some low speed devices have problems with the quick delay, so */
4340 /* be a bit pessimistic with those devices. RHbug #23670 */
4341 if (oldspeed == USB_SPEED_LOW)
4342 delay = HUB_LONG_RESET_TIME;
4344 mutex_lock(hcd->address0_mutex);
4346 /* Reset the device; full speed may morph to high speed */
4347 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
4348 retval = hub_port_reset(hub, port1, udev, delay, false);
4349 if (retval < 0) /* error or disconnect */
4351 /* success, speed is known */
4355 /* Don't allow speed changes at reset, except usb 3.0 to faster */
4356 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed &&
4357 !(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) {
4358 dev_dbg(&udev->dev, "device reset changed speed!\n");
4361 oldspeed = udev->speed;
4363 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
4364 * it's fixed size except for full speed devices.
4365 * For Wireless USB devices, ep0 max packet is always 512 (tho
4366 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
4368 switch (udev->speed) {
4369 case USB_SPEED_SUPER_PLUS:
4370 case USB_SPEED_SUPER:
4371 case USB_SPEED_WIRELESS: /* fixed at 512 */
4372 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
4374 case USB_SPEED_HIGH: /* fixed at 64 */
4375 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
4377 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
4378 /* to determine the ep0 maxpacket size, try to read
4379 * the device descriptor to get bMaxPacketSize0 and
4380 * then correct our initial guess.
4382 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
4384 case USB_SPEED_LOW: /* fixed at 8 */
4385 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8);
4391 if (udev->speed == USB_SPEED_WIRELESS)
4392 speed = "variable speed Wireless";
4394 speed = usb_speed_string(udev->speed);
4396 if (udev->speed < USB_SPEED_SUPER)
4397 dev_info(&udev->dev,
4398 "%s %s USB device number %d using %s\n",
4399 (udev->config) ? "reset" : "new", speed,
4400 devnum, udev->bus->controller->driver->name);
4402 /* Set up TT records, if needed */
4404 udev->tt = hdev->tt;
4405 udev->ttport = hdev->ttport;
4406 } else if (udev->speed != USB_SPEED_HIGH
4407 && hdev->speed == USB_SPEED_HIGH) {
4409 dev_err(&udev->dev, "parent hub has no TT\n");
4413 udev->tt = &hub->tt;
4414 udev->ttport = port1;
4417 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
4418 * Because device hardware and firmware is sometimes buggy in
4419 * this area, and this is how Linux has done it for ages.
4420 * Change it cautiously.
4422 * NOTE: If use_new_scheme() is true we will start by issuing
4423 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
4424 * so it may help with some non-standards-compliant devices.
4425 * Otherwise we start with SET_ADDRESS and then try to read the
4426 * first 8 bytes of the device descriptor to get the ep0 maxpacket
4429 for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) {
4430 bool did_new_scheme = false;
4432 if (use_new_scheme(udev, retry_counter)) {
4433 struct usb_device_descriptor *buf;
4436 did_new_scheme = true;
4437 retval = hub_enable_device(udev);
4440 "hub failed to enable device, error %d\n",
4445 #define GET_DESCRIPTOR_BUFSIZE 64
4446 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
4452 /* Retry on all errors; some devices are flakey.
4453 * 255 is for WUSB devices, we actually need to use
4454 * 512 (WUSB1.0[4.8.1]).
4456 for (operations = 0; operations < 3; ++operations) {
4457 buf->bMaxPacketSize0 = 0;
4458 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
4459 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
4460 USB_DT_DEVICE << 8, 0,
4461 buf, GET_DESCRIPTOR_BUFSIZE,
4462 initial_descriptor_timeout);
4463 switch (buf->bMaxPacketSize0) {
4464 case 8: case 16: case 32: case 64: case 255:
4465 if (buf->bDescriptorType ==
4477 * Some devices time out if they are powered on
4478 * when already connected. They need a second
4479 * reset. But only on the first attempt,
4480 * lest we get into a time out/reset loop
4482 if (r == 0 || (r == -ETIMEDOUT && retries == 0))
4485 udev->descriptor.bMaxPacketSize0 =
4486 buf->bMaxPacketSize0;
4489 retval = hub_port_reset(hub, port1, udev, delay, false);
4490 if (retval < 0) /* error or disconnect */
4492 if (oldspeed != udev->speed) {
4494 "device reset changed speed!\n");
4500 dev_err(&udev->dev, "device descriptor read/64, error %d\n",
4505 #undef GET_DESCRIPTOR_BUFSIZE
4509 * If device is WUSB, we already assigned an
4510 * unauthorized address in the Connect Ack sequence;
4511 * authorization will assign the final address.
4513 if (udev->wusb == 0) {
4514 for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) {
4515 retval = hub_set_address(udev, devnum);
4521 if (retval != -ENODEV)
4522 dev_err(&udev->dev, "device not accepting address %d, error %d\n",
4526 if (udev->speed >= USB_SPEED_SUPER) {
4527 devnum = udev->devnum;
4528 dev_info(&udev->dev,
4529 "%s SuperSpeed%s USB device number %d using %s\n",
4530 (udev->config) ? "reset" : "new",
4531 (udev->speed == USB_SPEED_SUPER_PLUS) ? "Plus" : "",
4532 devnum, udev->bus->controller->driver->name);
4535 /* cope with hardware quirkiness:
4536 * - let SET_ADDRESS settle, some device hardware wants it
4537 * - read ep0 maxpacket even for high and low speed,
4540 /* use_new_scheme() checks the speed which may have
4541 * changed since the initial look so we cache the result
4548 retval = usb_get_device_descriptor(udev, 8);
4550 if (retval != -ENODEV)
4552 "device descriptor read/8, error %d\n",
4565 * Some superspeed devices have finished the link training process
4566 * and attached to a superspeed hub port, but the device descriptor
4567 * got from those devices show they aren't superspeed devices. Warm
4568 * reset the port attached by the devices can fix them.
4570 if ((udev->speed >= USB_SPEED_SUPER) &&
4571 (le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) {
4572 dev_err(&udev->dev, "got a wrong device descriptor, "
4573 "warm reset device\n");
4574 hub_port_reset(hub, port1, udev,
4575 HUB_BH_RESET_TIME, true);
4580 if (udev->descriptor.bMaxPacketSize0 == 0xff ||
4581 udev->speed >= USB_SPEED_SUPER)
4584 i = udev->descriptor.bMaxPacketSize0;
4585 if (usb_endpoint_maxp(&udev->ep0.desc) != i) {
4586 if (udev->speed == USB_SPEED_LOW ||
4587 !(i == 8 || i == 16 || i == 32 || i == 64)) {
4588 dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i);
4592 if (udev->speed == USB_SPEED_FULL)
4593 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
4595 dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i);
4596 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
4597 usb_ep0_reinit(udev);
4600 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
4601 if (retval < (signed)sizeof(udev->descriptor)) {
4602 if (retval != -ENODEV)
4603 dev_err(&udev->dev, "device descriptor read/all, error %d\n",
4610 usb_detect_quirks(udev);
4612 if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
4613 retval = usb_get_bos_descriptor(udev);
4615 udev->lpm_capable = usb_device_supports_lpm(udev);
4616 usb_set_lpm_parameters(udev);
4621 /* notify HCD that we have a device connected and addressed */
4622 if (hcd->driver->update_device)
4623 hcd->driver->update_device(hcd, udev);
4624 hub_set_initial_usb2_lpm_policy(udev);
4627 hub_port_disable(hub, port1, 0);
4628 update_devnum(udev, devnum); /* for disconnect processing */
4630 mutex_unlock(hcd->address0_mutex);
4635 check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1)
4637 struct usb_qualifier_descriptor *qual;
4640 if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER)
4643 qual = kmalloc(sizeof *qual, GFP_KERNEL);
4647 status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0,
4648 qual, sizeof *qual);
4649 if (status == sizeof *qual) {
4650 dev_info(&udev->dev, "not running at top speed; "
4651 "connect to a high speed hub\n");
4652 /* hub LEDs are probably harder to miss than syslog */
4653 if (hub->has_indicators) {
4654 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
4655 queue_delayed_work(system_power_efficient_wq,
4663 hub_power_remaining(struct usb_hub *hub)
4665 struct usb_device *hdev = hub->hdev;
4669 if (!hub->limited_power)
4672 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
4673 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
4674 struct usb_port *port_dev = hub->ports[port1 - 1];
4675 struct usb_device *udev = port_dev->child;
4681 if (hub_is_superspeed(udev))
4687 * Unconfigured devices may not use more than one unit load,
4688 * or 8mA for OTG ports
4690 if (udev->actconfig)
4691 delta = usb_get_max_power(udev, udev->actconfig);
4692 else if (port1 != udev->bus->otg_port || hdev->parent)
4696 if (delta > hub->mA_per_port)
4697 dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n",
4698 delta, hub->mA_per_port);
4701 if (remaining < 0) {
4702 dev_warn(hub->intfdev, "%dmA over power budget!\n",
4709 static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus,
4714 struct usb_device *hdev = hub->hdev;
4715 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
4716 struct usb_port *port_dev = hub->ports[port1 - 1];
4717 struct usb_device *udev = port_dev->child;
4718 static int unreliable_port = -1;
4720 /* Disconnect any existing devices under this port */
4722 if (hcd->usb_phy && !hdev->parent)
4723 usb_phy_notify_disconnect(hcd->usb_phy, udev->speed);
4724 usb_disconnect(&port_dev->child);
4727 /* We can forget about a "removed" device when there's a physical
4728 * disconnect or the connect status changes.
4730 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
4731 (portchange & USB_PORT_STAT_C_CONNECTION))
4732 clear_bit(port1, hub->removed_bits);
4734 if (portchange & (USB_PORT_STAT_C_CONNECTION |
4735 USB_PORT_STAT_C_ENABLE)) {
4736 status = hub_port_debounce_be_stable(hub, port1);
4738 if (status != -ENODEV &&
4739 port1 != unreliable_port &&
4741 dev_err(&port_dev->dev, "connect-debounce failed\n");
4742 portstatus &= ~USB_PORT_STAT_CONNECTION;
4743 unreliable_port = port1;
4745 portstatus = status;
4749 /* Return now if debouncing failed or nothing is connected or
4750 * the device was "removed".
4752 if (!(portstatus & USB_PORT_STAT_CONNECTION) ||
4753 test_bit(port1, hub->removed_bits)) {
4756 * maybe switch power back on (e.g. root hub was reset)
4757 * but only if the port isn't owned by someone else.
4759 if (hub_is_port_power_switchable(hub)
4760 && !port_is_power_on(hub, portstatus)
4761 && !port_dev->port_owner)
4762 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
4764 if (portstatus & USB_PORT_STAT_ENABLE)
4768 if (hub_is_superspeed(hub->hdev))
4774 for (i = 0; i < SET_CONFIG_TRIES; i++) {
4776 /* reallocate for each attempt, since references
4777 * to the previous one can escape in various ways
4779 udev = usb_alloc_dev(hdev, hdev->bus, port1);
4781 dev_err(&port_dev->dev,
4782 "couldn't allocate usb_device\n");
4786 usb_set_device_state(udev, USB_STATE_POWERED);
4787 udev->bus_mA = hub->mA_per_port;
4788 udev->level = hdev->level + 1;
4789 udev->wusb = hub_is_wusb(hub);
4791 /* Devices connected to SuperSpeed hubs are USB 3.0 or later */
4792 if (hub_is_superspeed(hub->hdev))
4793 udev->speed = USB_SPEED_SUPER;
4795 udev->speed = USB_SPEED_UNKNOWN;
4797 choose_devnum(udev);
4798 if (udev->devnum <= 0) {
4799 status = -ENOTCONN; /* Don't retry */
4803 /* reset (non-USB 3.0 devices) and get descriptor */
4804 usb_lock_port(port_dev);
4805 status = hub_port_init(hub, udev, port1, i);
4806 usb_unlock_port(port_dev);
4810 if (udev->quirks & USB_QUIRK_DELAY_INIT)
4813 /* consecutive bus-powered hubs aren't reliable; they can
4814 * violate the voltage drop budget. if the new child has
4815 * a "powered" LED, users should notice we didn't enable it
4816 * (without reading syslog), even without per-port LEDs
4819 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
4820 && udev->bus_mA <= unit_load) {
4823 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
4826 dev_dbg(&udev->dev, "get status %d ?\n", status);
4829 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
4831 "can't connect bus-powered hub "
4833 if (hub->has_indicators) {
4834 hub->indicator[port1-1] =
4835 INDICATOR_AMBER_BLINK;
4837 system_power_efficient_wq,
4840 status = -ENOTCONN; /* Don't retry */
4845 /* check for devices running slower than they could */
4846 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
4847 && udev->speed == USB_SPEED_FULL
4848 && highspeed_hubs != 0)
4849 check_highspeed(hub, udev, port1);
4851 /* Store the parent's children[] pointer. At this point
4852 * udev becomes globally accessible, although presumably
4853 * no one will look at it until hdev is unlocked.
4857 mutex_lock(&usb_port_peer_mutex);
4859 /* We mustn't add new devices if the parent hub has
4860 * been disconnected; we would race with the
4861 * recursively_mark_NOTATTACHED() routine.
4863 spin_lock_irq(&device_state_lock);
4864 if (hdev->state == USB_STATE_NOTATTACHED)
4867 port_dev->child = udev;
4868 spin_unlock_irq(&device_state_lock);
4869 mutex_unlock(&usb_port_peer_mutex);
4871 /* Run it through the hoops (find a driver, etc) */
4873 status = usb_new_device(udev);
4875 mutex_lock(&usb_port_peer_mutex);
4876 spin_lock_irq(&device_state_lock);
4877 port_dev->child = NULL;
4878 spin_unlock_irq(&device_state_lock);
4879 mutex_unlock(&usb_port_peer_mutex);
4881 if (hcd->usb_phy && !hdev->parent)
4882 usb_phy_notify_connect(hcd->usb_phy,
4890 status = hub_power_remaining(hub);
4892 dev_dbg(hub->intfdev, "%dmA power budget left\n", status);
4897 hub_port_disable(hub, port1, 1);
4899 usb_ep0_reinit(udev);
4900 release_devnum(udev);
4903 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
4906 if (hub->hdev->parent ||
4907 !hcd->driver->port_handed_over ||
4908 !(hcd->driver->port_handed_over)(hcd, port1)) {
4909 if (status != -ENOTCONN && status != -ENODEV)
4910 dev_err(&port_dev->dev,
4911 "unable to enumerate USB device\n");
4915 hub_port_disable(hub, port1, 1);
4916 if (hcd->driver->relinquish_port && !hub->hdev->parent)
4917 hcd->driver->relinquish_port(hcd, port1);
4921 /* Handle physical or logical connection change events.
4922 * This routine is called when:
4923 * a port connection-change occurs;
4924 * a port enable-change occurs (often caused by EMI);
4925 * usb_reset_and_verify_device() encounters changed descriptors (as from
4926 * a firmware download)
4927 * caller already locked the hub
4929 static void hub_port_connect_change(struct usb_hub *hub, int port1,
4930 u16 portstatus, u16 portchange)
4931 __must_hold(&port_dev->status_lock)
4933 struct usb_port *port_dev = hub->ports[port1 - 1];
4934 struct usb_device *udev = port_dev->child;
4935 int status = -ENODEV;
4937 dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus,
4938 portchange, portspeed(hub, portstatus));
4940 if (hub->has_indicators) {
4941 set_port_led(hub, port1, HUB_LED_AUTO);
4942 hub->indicator[port1-1] = INDICATOR_AUTO;
4945 #ifdef CONFIG_USB_OTG
4946 /* during HNP, don't repeat the debounce */
4947 if (hub->hdev->bus->is_b_host)
4948 portchange &= ~(USB_PORT_STAT_C_CONNECTION |
4949 USB_PORT_STAT_C_ENABLE);
4952 /* Try to resuscitate an existing device */
4953 if ((portstatus & USB_PORT_STAT_CONNECTION) && udev &&
4954 udev->state != USB_STATE_NOTATTACHED) {
4955 if (portstatus & USB_PORT_STAT_ENABLE) {
4956 status = 0; /* Nothing to do */
4958 } else if (udev->state == USB_STATE_SUSPENDED &&
4959 udev->persist_enabled) {
4960 /* For a suspended device, treat this as a
4961 * remote wakeup event.
4963 usb_unlock_port(port_dev);
4964 status = usb_remote_wakeup(udev);
4965 usb_lock_port(port_dev);
4968 /* Don't resuscitate */;
4971 clear_bit(port1, hub->change_bits);
4973 /* successfully revalidated the connection */
4977 usb_unlock_port(port_dev);
4978 hub_port_connect(hub, port1, portstatus, portchange);
4979 usb_lock_port(port_dev);
4982 static void port_event(struct usb_hub *hub, int port1)
4983 __must_hold(&port_dev->status_lock)
4986 struct usb_port *port_dev = hub->ports[port1 - 1];
4987 struct usb_device *udev = port_dev->child;
4988 struct usb_device *hdev = hub->hdev;
4989 u16 portstatus, portchange;
4991 connect_change = test_bit(port1, hub->change_bits);
4992 clear_bit(port1, hub->event_bits);
4993 clear_bit(port1, hub->wakeup_bits);
4995 if (hub_port_status(hub, port1, &portstatus, &portchange) < 0)
4998 if (portchange & USB_PORT_STAT_C_CONNECTION) {
4999 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
5003 if (portchange & USB_PORT_STAT_C_ENABLE) {
5004 if (!connect_change)
5005 dev_dbg(&port_dev->dev, "enable change, status %08x\n",
5007 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
5010 * EM interference sometimes causes badly shielded USB devices
5011 * to be shutdown by the hub, this hack enables them again.
5012 * Works at least with mouse driver.
5014 if (!(portstatus & USB_PORT_STAT_ENABLE)
5015 && !connect_change && udev) {
5016 dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n");
5021 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
5022 u16 status = 0, unused;
5024 dev_dbg(&port_dev->dev, "over-current change\n");
5025 usb_clear_port_feature(hdev, port1,
5026 USB_PORT_FEAT_C_OVER_CURRENT);
5027 msleep(100); /* Cool down */
5028 hub_power_on(hub, true);
5029 hub_port_status(hub, port1, &status, &unused);
5030 if (status & USB_PORT_STAT_OVERCURRENT)
5031 dev_err(&port_dev->dev, "over-current condition\n");
5034 if (portchange & USB_PORT_STAT_C_RESET) {
5035 dev_dbg(&port_dev->dev, "reset change\n");
5036 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET);
5038 if ((portchange & USB_PORT_STAT_C_BH_RESET)
5039 && hub_is_superspeed(hdev)) {
5040 dev_dbg(&port_dev->dev, "warm reset change\n");
5041 usb_clear_port_feature(hdev, port1,
5042 USB_PORT_FEAT_C_BH_PORT_RESET);
5044 if (portchange & USB_PORT_STAT_C_LINK_STATE) {
5045 dev_dbg(&port_dev->dev, "link state change\n");
5046 usb_clear_port_feature(hdev, port1,
5047 USB_PORT_FEAT_C_PORT_LINK_STATE);
5049 if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) {
5050 dev_warn(&port_dev->dev, "config error\n");
5051 usb_clear_port_feature(hdev, port1,
5052 USB_PORT_FEAT_C_PORT_CONFIG_ERROR);
5055 /* skip port actions that require the port to be powered on */
5056 if (!pm_runtime_active(&port_dev->dev))
5059 if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange))
5063 * Warm reset a USB3 protocol port if it's in
5064 * SS.Inactive state.
5066 if (hub_port_warm_reset_required(hub, port1, portstatus)) {
5067 dev_dbg(&port_dev->dev, "do warm reset\n");
5068 if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION)
5069 || udev->state == USB_STATE_NOTATTACHED) {
5070 if (hub_port_reset(hub, port1, NULL,
5071 HUB_BH_RESET_TIME, true) < 0)
5072 hub_port_disable(hub, port1, 1);
5074 usb_unlock_port(port_dev);
5075 usb_lock_device(udev);
5076 usb_reset_device(udev);
5077 usb_unlock_device(udev);
5078 usb_lock_port(port_dev);
5084 hub_port_connect_change(hub, port1, portstatus, portchange);
5087 static void hub_event(struct work_struct *work)
5089 struct usb_device *hdev;
5090 struct usb_interface *intf;
5091 struct usb_hub *hub;
5092 struct device *hub_dev;
5097 hub = container_of(work, struct usb_hub, events);
5099 hub_dev = hub->intfdev;
5100 intf = to_usb_interface(hub_dev);
5102 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
5103 hdev->state, hdev->maxchild,
5104 /* NOTE: expects max 15 ports... */
5105 (u16) hub->change_bits[0],
5106 (u16) hub->event_bits[0]);
5108 /* Lock the device, then check to see if we were
5109 * disconnected while waiting for the lock to succeed. */
5110 usb_lock_device(hdev);
5111 if (unlikely(hub->disconnected))
5114 /* If the hub has died, clean up after it */
5115 if (hdev->state == USB_STATE_NOTATTACHED) {
5116 hub->error = -ENODEV;
5117 hub_quiesce(hub, HUB_DISCONNECT);
5122 ret = usb_autopm_get_interface(intf);
5124 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
5128 /* If this is an inactive hub, do nothing */
5133 dev_dbg(hub_dev, "resetting for error %d\n", hub->error);
5135 ret = usb_reset_device(hdev);
5137 dev_dbg(hub_dev, "error resetting hub: %d\n", ret);
5145 /* deal with port status changes */
5146 for (i = 1; i <= hdev->maxchild; i++) {
5147 struct usb_port *port_dev = hub->ports[i - 1];
5149 if (test_bit(i, hub->event_bits)
5150 || test_bit(i, hub->change_bits)
5151 || test_bit(i, hub->wakeup_bits)) {
5153 * The get_noresume and barrier ensure that if
5154 * the port was in the process of resuming, we
5155 * flush that work and keep the port active for
5156 * the duration of the port_event(). However,
5157 * if the port is runtime pm suspended
5158 * (powered-off), we leave it in that state, run
5159 * an abbreviated port_event(), and move on.
5161 pm_runtime_get_noresume(&port_dev->dev);
5162 pm_runtime_barrier(&port_dev->dev);
5163 usb_lock_port(port_dev);
5165 usb_unlock_port(port_dev);
5166 pm_runtime_put_sync(&port_dev->dev);
5170 /* deal with hub status changes */
5171 if (test_and_clear_bit(0, hub->event_bits) == 0)
5173 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
5174 dev_err(hub_dev, "get_hub_status failed\n");
5176 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
5177 dev_dbg(hub_dev, "power change\n");
5178 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
5179 if (hubstatus & HUB_STATUS_LOCAL_POWER)
5180 /* FIXME: Is this always true? */
5181 hub->limited_power = 1;
5183 hub->limited_power = 0;
5185 if (hubchange & HUB_CHANGE_OVERCURRENT) {
5189 dev_dbg(hub_dev, "over-current change\n");
5190 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
5191 msleep(500); /* Cool down */
5192 hub_power_on(hub, true);
5193 hub_hub_status(hub, &status, &unused);
5194 if (status & HUB_STATUS_OVERCURRENT)
5195 dev_err(hub_dev, "over-current condition\n");
5200 /* Balance the usb_autopm_get_interface() above */
5201 usb_autopm_put_interface_no_suspend(intf);
5203 usb_unlock_device(hdev);
5205 /* Balance the stuff in kick_hub_wq() and allow autosuspend */
5206 usb_autopm_put_interface(intf);
5207 kref_put(&hub->kref, hub_release);
5210 static const struct usb_device_id hub_id_table[] = {
5211 { .match_flags = USB_DEVICE_ID_MATCH_VENDOR
5212 | USB_DEVICE_ID_MATCH_INT_CLASS,
5213 .idVendor = USB_VENDOR_GENESYS_LOGIC,
5214 .bInterfaceClass = USB_CLASS_HUB,
5215 .driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND},
5216 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
5217 .bDeviceClass = USB_CLASS_HUB},
5218 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
5219 .bInterfaceClass = USB_CLASS_HUB},
5220 { } /* Terminating entry */
5223 MODULE_DEVICE_TABLE(usb, hub_id_table);
5225 static struct usb_driver hub_driver = {
5228 .disconnect = hub_disconnect,
5229 .suspend = hub_suspend,
5230 .resume = hub_resume,
5231 .reset_resume = hub_reset_resume,
5232 .pre_reset = hub_pre_reset,
5233 .post_reset = hub_post_reset,
5234 .unlocked_ioctl = hub_ioctl,
5235 .id_table = hub_id_table,
5236 .supports_autosuspend = 1,
5239 int usb_hub_init(void)
5241 if (usb_register(&hub_driver) < 0) {
5242 printk(KERN_ERR "%s: can't register hub driver\n",
5248 * The workqueue needs to be freezable to avoid interfering with
5249 * USB-PERSIST port handover. Otherwise it might see that a full-speed
5250 * device was gone before the EHCI controller had handed its port
5251 * over to the companion full-speed controller.
5253 hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0);
5257 /* Fall through if kernel_thread failed */
5258 usb_deregister(&hub_driver);
5259 pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name);
5264 void usb_hub_cleanup(void)
5266 destroy_workqueue(hub_wq);
5269 * Hub resources are freed for us by usb_deregister. It calls
5270 * usb_driver_purge on every device which in turn calls that
5271 * devices disconnect function if it is using this driver.
5272 * The hub_disconnect function takes care of releasing the
5273 * individual hub resources. -greg
5275 usb_deregister(&hub_driver);
5276 } /* usb_hub_cleanup() */
5278 static int descriptors_changed(struct usb_device *udev,
5279 struct usb_device_descriptor *old_device_descriptor,
5280 struct usb_host_bos *old_bos)
5284 unsigned serial_len = 0;
5286 unsigned old_length;
5290 if (memcmp(&udev->descriptor, old_device_descriptor,
5291 sizeof(*old_device_descriptor)) != 0)
5294 if ((old_bos && !udev->bos) || (!old_bos && udev->bos))
5297 len = le16_to_cpu(udev->bos->desc->wTotalLength);
5298 if (len != le16_to_cpu(old_bos->desc->wTotalLength))
5300 if (memcmp(udev->bos->desc, old_bos->desc, len))
5304 /* Since the idVendor, idProduct, and bcdDevice values in the
5305 * device descriptor haven't changed, we will assume the
5306 * Manufacturer and Product strings haven't changed either.
5307 * But the SerialNumber string could be different (e.g., a
5308 * different flash card of the same brand).
5311 serial_len = strlen(udev->serial) + 1;
5314 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
5315 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
5316 len = max(len, old_length);
5319 buf = kmalloc(len, GFP_NOIO);
5321 /* assume the worst */
5324 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
5325 old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
5326 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
5328 if (length != old_length) {
5329 dev_dbg(&udev->dev, "config index %d, error %d\n",
5334 if (memcmp(buf, udev->rawdescriptors[index], old_length)
5336 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
5338 ((struct usb_config_descriptor *) buf)->
5339 bConfigurationValue);
5345 if (!changed && serial_len) {
5346 length = usb_string(udev, udev->descriptor.iSerialNumber,
5348 if (length + 1 != serial_len) {
5349 dev_dbg(&udev->dev, "serial string error %d\n",
5352 } else if (memcmp(buf, udev->serial, length) != 0) {
5353 dev_dbg(&udev->dev, "serial string changed\n");
5363 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
5364 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5366 * WARNING - don't use this routine to reset a composite device
5367 * (one with multiple interfaces owned by separate drivers)!
5368 * Use usb_reset_device() instead.
5370 * Do a port reset, reassign the device's address, and establish its
5371 * former operating configuration. If the reset fails, or the device's
5372 * descriptors change from their values before the reset, or the original
5373 * configuration and altsettings cannot be restored, a flag will be set
5374 * telling hub_wq to pretend the device has been disconnected and then
5375 * re-connected. All drivers will be unbound, and the device will be
5376 * re-enumerated and probed all over again.
5378 * Return: 0 if the reset succeeded, -ENODEV if the device has been
5379 * flagged for logical disconnection, or some other negative error code
5380 * if the reset wasn't even attempted.
5383 * The caller must own the device lock and the port lock, the latter is
5384 * taken by usb_reset_device(). For example, it's safe to use
5385 * usb_reset_device() from a driver probe() routine after downloading
5386 * new firmware. For calls that might not occur during probe(), drivers
5387 * should lock the device using usb_lock_device_for_reset().
5389 * Locking exception: This routine may also be called from within an
5390 * autoresume handler. Such usage won't conflict with other tasks
5391 * holding the device lock because these tasks should always call
5392 * usb_autopm_resume_device(), thereby preventing any unwanted
5393 * autoresume. The autoresume handler is expected to have already
5394 * acquired the port lock before calling this routine.
5396 static int usb_reset_and_verify_device(struct usb_device *udev)
5398 struct usb_device *parent_hdev = udev->parent;
5399 struct usb_hub *parent_hub;
5400 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
5401 struct usb_device_descriptor descriptor = udev->descriptor;
5402 struct usb_host_bos *bos;
5404 int port1 = udev->portnum;
5406 if (udev->state == USB_STATE_NOTATTACHED ||
5407 udev->state == USB_STATE_SUSPENDED) {
5408 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
5416 parent_hub = usb_hub_to_struct_hub(parent_hdev);
5418 /* Disable USB2 hardware LPM.
5419 * It will be re-enabled by the enumeration process.
5421 if (udev->usb2_hw_lpm_enabled == 1)
5422 usb_set_usb2_hardware_lpm(udev, 0);
5424 /* Disable LPM and LTM while we reset the device and reinstall the alt
5425 * settings. Device-initiated LPM settings, and system exit latency
5426 * settings are cleared when the device is reset, so we have to set
5429 ret = usb_unlocked_disable_lpm(udev);
5431 dev_err(&udev->dev, "%s Failed to disable LPM\n.", __func__);
5432 goto re_enumerate_no_bos;
5434 ret = usb_disable_ltm(udev);
5436 dev_err(&udev->dev, "%s Failed to disable LTM\n.",
5438 goto re_enumerate_no_bos;
5444 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
5446 /* ep0 maxpacket size may change; let the HCD know about it.
5447 * Other endpoints will be handled by re-enumeration. */
5448 usb_ep0_reinit(udev);
5449 ret = hub_port_init(parent_hub, udev, port1, i);
5450 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
5457 /* Device might have changed firmware (DFU or similar) */
5458 if (descriptors_changed(udev, &descriptor, bos)) {
5459 dev_info(&udev->dev, "device firmware changed\n");
5460 udev->descriptor = descriptor; /* for disconnect() calls */
5464 /* Restore the device's previous configuration */
5465 if (!udev->actconfig)
5468 mutex_lock(hcd->bandwidth_mutex);
5469 ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL);
5471 dev_warn(&udev->dev,
5472 "Busted HC? Not enough HCD resources for "
5473 "old configuration.\n");
5474 mutex_unlock(hcd->bandwidth_mutex);
5477 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
5478 USB_REQ_SET_CONFIGURATION, 0,
5479 udev->actconfig->desc.bConfigurationValue, 0,
5480 NULL, 0, USB_CTRL_SET_TIMEOUT);
5483 "can't restore configuration #%d (error=%d)\n",
5484 udev->actconfig->desc.bConfigurationValue, ret);
5485 mutex_unlock(hcd->bandwidth_mutex);
5488 mutex_unlock(hcd->bandwidth_mutex);
5489 usb_set_device_state(udev, USB_STATE_CONFIGURED);
5491 /* Put interfaces back into the same altsettings as before.
5492 * Don't bother to send the Set-Interface request for interfaces
5493 * that were already in altsetting 0; besides being unnecessary,
5494 * many devices can't handle it. Instead just reset the host-side
5497 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
5498 struct usb_host_config *config = udev->actconfig;
5499 struct usb_interface *intf = config->interface[i];
5500 struct usb_interface_descriptor *desc;
5502 desc = &intf->cur_altsetting->desc;
5503 if (desc->bAlternateSetting == 0) {
5504 usb_disable_interface(udev, intf, true);
5505 usb_enable_interface(udev, intf, true);
5508 /* Let the bandwidth allocation function know that this
5509 * device has been reset, and it will have to use
5510 * alternate setting 0 as the current alternate setting.
5512 intf->resetting_device = 1;
5513 ret = usb_set_interface(udev, desc->bInterfaceNumber,
5514 desc->bAlternateSetting);
5515 intf->resetting_device = 0;
5518 dev_err(&udev->dev, "failed to restore interface %d "
5519 "altsetting %d (error=%d)\n",
5520 desc->bInterfaceNumber,
5521 desc->bAlternateSetting,
5525 /* Resetting also frees any allocated streams */
5526 for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++)
5527 intf->cur_altsetting->endpoint[j].streams = 0;
5531 /* Now that the alt settings are re-installed, enable LTM and LPM. */
5532 usb_set_usb2_hardware_lpm(udev, 1);
5533 usb_unlocked_enable_lpm(udev);
5534 usb_enable_ltm(udev);
5535 usb_release_bos_descriptor(udev);
5540 usb_release_bos_descriptor(udev);
5542 re_enumerate_no_bos:
5543 /* LPM state doesn't matter when we're about to destroy the device. */
5544 hub_port_logical_disconnect(parent_hub, port1);
5549 * usb_reset_device - warn interface drivers and perform a USB port reset
5550 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5552 * Warns all drivers bound to registered interfaces (using their pre_reset
5553 * method), performs the port reset, and then lets the drivers know that
5554 * the reset is over (using their post_reset method).
5556 * Return: The same as for usb_reset_and_verify_device().
5559 * The caller must own the device lock. For example, it's safe to use
5560 * this from a driver probe() routine after downloading new firmware.
5561 * For calls that might not occur during probe(), drivers should lock
5562 * the device using usb_lock_device_for_reset().
5564 * If an interface is currently being probed or disconnected, we assume
5565 * its driver knows how to handle resets. For all other interfaces,
5566 * if the driver doesn't have pre_reset and post_reset methods then
5567 * we attempt to unbind it and rebind afterward.
5569 int usb_reset_device(struct usb_device *udev)
5573 unsigned int noio_flag;
5574 struct usb_port *port_dev;
5575 struct usb_host_config *config = udev->actconfig;
5576 struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
5578 if (udev->state == USB_STATE_NOTATTACHED ||
5579 udev->state == USB_STATE_SUSPENDED) {
5580 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
5585 if (!udev->parent) {
5586 /* this requires hcd-specific logic; see ohci_restart() */
5587 dev_dbg(&udev->dev, "%s for root hub!\n", __func__);
5591 port_dev = hub->ports[udev->portnum - 1];
5594 * Don't allocate memory with GFP_KERNEL in current
5595 * context to avoid possible deadlock if usb mass
5596 * storage interface or usbnet interface(iSCSI case)
5597 * is included in current configuration. The easist
5598 * approach is to do it for every device reset,
5599 * because the device 'memalloc_noio' flag may have
5600 * not been set before reseting the usb device.
5602 noio_flag = memalloc_noio_save();
5604 /* Prevent autosuspend during the reset */
5605 usb_autoresume_device(udev);
5608 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
5609 struct usb_interface *cintf = config->interface[i];
5610 struct usb_driver *drv;
5613 if (cintf->dev.driver) {
5614 drv = to_usb_driver(cintf->dev.driver);
5615 if (drv->pre_reset && drv->post_reset)
5616 unbind = (drv->pre_reset)(cintf);
5617 else if (cintf->condition ==
5618 USB_INTERFACE_BOUND)
5621 usb_forced_unbind_intf(cintf);
5626 usb_lock_port(port_dev);
5627 ret = usb_reset_and_verify_device(udev);
5628 usb_unlock_port(port_dev);
5631 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
5632 struct usb_interface *cintf = config->interface[i];
5633 struct usb_driver *drv;
5634 int rebind = cintf->needs_binding;
5636 if (!rebind && cintf->dev.driver) {
5637 drv = to_usb_driver(cintf->dev.driver);
5638 if (drv->post_reset)
5639 rebind = (drv->post_reset)(cintf);
5640 else if (cintf->condition ==
5641 USB_INTERFACE_BOUND)
5644 cintf->needs_binding = 1;
5647 usb_unbind_and_rebind_marked_interfaces(udev);
5650 usb_autosuspend_device(udev);
5651 memalloc_noio_restore(noio_flag);
5654 EXPORT_SYMBOL_GPL(usb_reset_device);
5658 * usb_queue_reset_device - Reset a USB device from an atomic context
5659 * @iface: USB interface belonging to the device to reset
5661 * This function can be used to reset a USB device from an atomic
5662 * context, where usb_reset_device() won't work (as it blocks).
5664 * Doing a reset via this method is functionally equivalent to calling
5665 * usb_reset_device(), except for the fact that it is delayed to a
5666 * workqueue. This means that any drivers bound to other interfaces
5667 * might be unbound, as well as users from usbfs in user space.
5671 * - Scheduling two resets at the same time from two different drivers
5672 * attached to two different interfaces of the same device is
5673 * possible; depending on how the driver attached to each interface
5674 * handles ->pre_reset(), the second reset might happen or not.
5676 * - If the reset is delayed so long that the interface is unbound from
5677 * its driver, the reset will be skipped.
5679 * - This function can be called during .probe(). It can also be called
5680 * during .disconnect(), but doing so is pointless because the reset
5681 * will not occur. If you really want to reset the device during
5682 * .disconnect(), call usb_reset_device() directly -- but watch out
5683 * for nested unbinding issues!
5685 void usb_queue_reset_device(struct usb_interface *iface)
5687 if (schedule_work(&iface->reset_ws))
5688 usb_get_intf(iface);
5690 EXPORT_SYMBOL_GPL(usb_queue_reset_device);
5693 * usb_hub_find_child - Get the pointer of child device
5694 * attached to the port which is specified by @port1.
5695 * @hdev: USB device belonging to the usb hub
5696 * @port1: port num to indicate which port the child device
5699 * USB drivers call this function to get hub's child device
5702 * Return: %NULL if input param is invalid and
5703 * child's usb_device pointer if non-NULL.
5705 struct usb_device *usb_hub_find_child(struct usb_device *hdev,
5708 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
5710 if (port1 < 1 || port1 > hdev->maxchild)
5712 return hub->ports[port1 - 1]->child;
5714 EXPORT_SYMBOL_GPL(usb_hub_find_child);
5716 void usb_hub_adjust_deviceremovable(struct usb_device *hdev,
5717 struct usb_hub_descriptor *desc)
5719 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
5720 enum usb_port_connect_type connect_type;
5726 if (!hub_is_superspeed(hdev)) {
5727 for (i = 1; i <= hdev->maxchild; i++) {
5728 struct usb_port *port_dev = hub->ports[i - 1];
5730 connect_type = port_dev->connect_type;
5731 if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
5732 u8 mask = 1 << (i%8);
5734 if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) {
5735 dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n");
5736 desc->u.hs.DeviceRemovable[i/8] |= mask;
5741 u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable);
5743 for (i = 1; i <= hdev->maxchild; i++) {
5744 struct usb_port *port_dev = hub->ports[i - 1];
5746 connect_type = port_dev->connect_type;
5747 if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
5750 if (!(port_removable & mask)) {
5751 dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n");
5752 port_removable |= mask;
5757 desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable);
5763 * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
5764 * @hdev: USB device belonging to the usb hub
5765 * @port1: port num of the port
5767 * Return: Port's acpi handle if successful, %NULL if params are
5770 acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
5773 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
5778 return ACPI_HANDLE(&hub->ports[port1 - 1]->dev);