4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/usb/hcd.h>
23 #include <linux/usb/otg.h>
24 #include <linux/usb/quirks.h>
25 #include <linux/kthread.h>
26 #include <linux/mutex.h>
27 #include <linux/freezer.h>
28 #include <linux/random.h>
29 #include <linux/pm_qos.h>
31 #include <asm/uaccess.h>
32 #include <asm/byteorder.h>
36 /* if we are in debug mode, always announce new devices */
38 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
39 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
43 #define USB_VENDOR_GENESYS_LOGIC 0x05e3
44 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01
46 static inline int hub_is_superspeed(struct usb_device
*hdev
)
48 return (hdev
->descriptor
.bDeviceProtocol
== USB_HUB_PR_SS
);
51 /* Protect struct usb_device->state and ->children members
52 * Note: Both are also protected by ->dev.sem, except that ->state can
53 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
54 static DEFINE_SPINLOCK(device_state_lock
);
56 /* khubd's worklist and its lock */
57 static DEFINE_SPINLOCK(hub_event_lock
);
58 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
61 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
63 static struct task_struct
*khubd_task
;
65 /* cycle leds on hubs that aren't blinking for attention */
66 static bool blinkenlights
= 0;
67 module_param (blinkenlights
, bool, S_IRUGO
);
68 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
71 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
72 * 10 seconds to send reply for the initial 64-byte descriptor request.
74 /* define initial 64-byte descriptor request timeout in milliseconds */
75 static int initial_descriptor_timeout
= USB_CTRL_GET_TIMEOUT
;
76 module_param(initial_descriptor_timeout
, int, S_IRUGO
|S_IWUSR
);
77 MODULE_PARM_DESC(initial_descriptor_timeout
,
78 "initial 64-byte descriptor request timeout in milliseconds "
79 "(default 5000 - 5.0 seconds)");
82 * As of 2.6.10 we introduce a new USB device initialization scheme which
83 * closely resembles the way Windows works. Hopefully it will be compatible
84 * with a wider range of devices than the old scheme. However some previously
85 * working devices may start giving rise to "device not accepting address"
86 * errors; if that happens the user can try the old scheme by adjusting the
87 * following module parameters.
89 * For maximum flexibility there are two boolean parameters to control the
90 * hub driver's behavior. On the first initialization attempt, if the
91 * "old_scheme_first" parameter is set then the old scheme will be used,
92 * otherwise the new scheme is used. If that fails and "use_both_schemes"
93 * is set, then the driver will make another attempt, using the other scheme.
95 static bool old_scheme_first
= 0;
96 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
97 MODULE_PARM_DESC(old_scheme_first
,
98 "start with the old device initialization scheme");
100 static bool use_both_schemes
= 1;
101 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
102 MODULE_PARM_DESC(use_both_schemes
,
103 "try the other device initialization scheme if the "
106 /* Mutual exclusion for EHCI CF initialization. This interferes with
107 * port reset on some companion controllers.
109 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
110 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
112 #define HUB_DEBOUNCE_TIMEOUT 2000
113 #define HUB_DEBOUNCE_STEP 25
114 #define HUB_DEBOUNCE_STABLE 100
116 static int usb_reset_and_verify_device(struct usb_device
*udev
);
118 static inline char *portspeed(struct usb_hub
*hub
, int portstatus
)
120 if (hub_is_superspeed(hub
->hdev
))
122 if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
124 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
130 /* Note that hdev or one of its children must be locked! */
131 struct usb_hub
*usb_hub_to_struct_hub(struct usb_device
*hdev
)
133 if (!hdev
|| !hdev
->actconfig
|| !hdev
->maxchild
)
135 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
138 static int usb_device_supports_lpm(struct usb_device
*udev
)
140 /* USB 2.1 (and greater) devices indicate LPM support through
141 * their USB 2.0 Extended Capabilities BOS descriptor.
143 if (udev
->speed
== USB_SPEED_HIGH
) {
144 if (udev
->bos
->ext_cap
&&
146 le32_to_cpu(udev
->bos
->ext_cap
->bmAttributes
)))
151 /* All USB 3.0 must support LPM, but we need their max exit latency
152 * information from the SuperSpeed Extended Capabilities BOS descriptor.
154 if (!udev
->bos
->ss_cap
) {
155 dev_warn(&udev
->dev
, "No LPM exit latency info found. "
156 "Power management will be impacted.\n");
159 if (udev
->parent
->lpm_capable
)
162 dev_warn(&udev
->dev
, "Parent hub missing LPM exit latency info. "
163 "Power management will be impacted.\n");
168 * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
171 static void usb_set_lpm_mel(struct usb_device
*udev
,
172 struct usb3_lpm_parameters
*udev_lpm_params
,
173 unsigned int udev_exit_latency
,
175 struct usb3_lpm_parameters
*hub_lpm_params
,
176 unsigned int hub_exit_latency
)
178 unsigned int total_mel
;
179 unsigned int device_mel
;
180 unsigned int hub_mel
;
183 * Calculate the time it takes to transition all links from the roothub
184 * to the parent hub into U0. The parent hub must then decode the
185 * packet (hub header decode latency) to figure out which port it was
188 * The Hub Header decode latency is expressed in 0.1us intervals (0x1
189 * means 0.1us). Multiply that by 100 to get nanoseconds.
191 total_mel
= hub_lpm_params
->mel
+
192 (hub
->descriptor
->u
.ss
.bHubHdrDecLat
* 100);
195 * How long will it take to transition the downstream hub's port into
196 * U0? The greater of either the hub exit latency or the device exit
199 * The BOS U1/U2 exit latencies are expressed in 1us intervals.
200 * Multiply that by 1000 to get nanoseconds.
202 device_mel
= udev_exit_latency
* 1000;
203 hub_mel
= hub_exit_latency
* 1000;
204 if (device_mel
> hub_mel
)
205 total_mel
+= device_mel
;
207 total_mel
+= hub_mel
;
209 udev_lpm_params
->mel
= total_mel
;
213 * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
214 * a transition from either U1 or U2.
216 static void usb_set_lpm_pel(struct usb_device
*udev
,
217 struct usb3_lpm_parameters
*udev_lpm_params
,
218 unsigned int udev_exit_latency
,
220 struct usb3_lpm_parameters
*hub_lpm_params
,
221 unsigned int hub_exit_latency
,
222 unsigned int port_to_port_exit_latency
)
224 unsigned int first_link_pel
;
225 unsigned int hub_pel
;
228 * First, the device sends an LFPS to transition the link between the
229 * device and the parent hub into U0. The exit latency is the bigger of
230 * the device exit latency or the hub exit latency.
232 if (udev_exit_latency
> hub_exit_latency
)
233 first_link_pel
= udev_exit_latency
* 1000;
235 first_link_pel
= hub_exit_latency
* 1000;
238 * When the hub starts to receive the LFPS, there is a slight delay for
239 * it to figure out that one of the ports is sending an LFPS. Then it
240 * will forward the LFPS to its upstream link. The exit latency is the
241 * delay, plus the PEL that we calculated for this hub.
243 hub_pel
= port_to_port_exit_latency
* 1000 + hub_lpm_params
->pel
;
246 * According to figure C-7 in the USB 3.0 spec, the PEL for this device
247 * is the greater of the two exit latencies.
249 if (first_link_pel
> hub_pel
)
250 udev_lpm_params
->pel
= first_link_pel
;
252 udev_lpm_params
->pel
= hub_pel
;
256 * Set the System Exit Latency (SEL) to indicate the total worst-case time from
257 * when a device initiates a transition to U0, until when it will receive the
258 * first packet from the host controller.
260 * Section C.1.5.1 describes the four components to this:
262 * - t2: time for the ERDY to make it from the device to the host.
263 * - t3: a host-specific delay to process the ERDY.
264 * - t4: time for the packet to make it from the host to the device.
266 * t3 is specific to both the xHCI host and the platform the host is integrated
267 * into. The Intel HW folks have said it's negligible, FIXME if a different
268 * vendor says otherwise.
270 static void usb_set_lpm_sel(struct usb_device
*udev
,
271 struct usb3_lpm_parameters
*udev_lpm_params
)
273 struct usb_device
*parent
;
274 unsigned int num_hubs
;
275 unsigned int total_sel
;
277 /* t1 = device PEL */
278 total_sel
= udev_lpm_params
->pel
;
279 /* How many external hubs are in between the device & the root port. */
280 for (parent
= udev
->parent
, num_hubs
= 0; parent
->parent
;
281 parent
= parent
->parent
)
283 /* t2 = 2.1us + 250ns * (num_hubs - 1) */
285 total_sel
+= 2100 + 250 * (num_hubs
- 1);
287 /* t4 = 250ns * num_hubs */
288 total_sel
+= 250 * num_hubs
;
290 udev_lpm_params
->sel
= total_sel
;
293 static void usb_set_lpm_parameters(struct usb_device
*udev
)
296 unsigned int port_to_port_delay
;
297 unsigned int udev_u1_del
;
298 unsigned int udev_u2_del
;
299 unsigned int hub_u1_del
;
300 unsigned int hub_u2_del
;
302 if (!udev
->lpm_capable
|| udev
->speed
!= USB_SPEED_SUPER
)
305 hub
= usb_hub_to_struct_hub(udev
->parent
);
306 /* It doesn't take time to transition the roothub into U0, since it
307 * doesn't have an upstream link.
312 udev_u1_del
= udev
->bos
->ss_cap
->bU1devExitLat
;
313 udev_u2_del
= udev
->bos
->ss_cap
->bU2DevExitLat
;
314 hub_u1_del
= udev
->parent
->bos
->ss_cap
->bU1devExitLat
;
315 hub_u2_del
= udev
->parent
->bos
->ss_cap
->bU2DevExitLat
;
317 usb_set_lpm_mel(udev
, &udev
->u1_params
, udev_u1_del
,
318 hub
, &udev
->parent
->u1_params
, hub_u1_del
);
320 usb_set_lpm_mel(udev
, &udev
->u2_params
, udev_u2_del
,
321 hub
, &udev
->parent
->u2_params
, hub_u2_del
);
324 * Appendix C, section C.2.2.2, says that there is a slight delay from
325 * when the parent hub notices the downstream port is trying to
326 * transition to U0 to when the hub initiates a U0 transition on its
327 * upstream port. The section says the delays are tPort2PortU1EL and
328 * tPort2PortU2EL, but it doesn't define what they are.
330 * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
331 * about the same delays. Use the maximum delay calculations from those
332 * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
333 * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
334 * assume the device exit latencies they are talking about are the hub
337 * What do we do if the U2 exit latency is less than the U1 exit
338 * latency? It's possible, although not likely...
340 port_to_port_delay
= 1;
342 usb_set_lpm_pel(udev
, &udev
->u1_params
, udev_u1_del
,
343 hub
, &udev
->parent
->u1_params
, hub_u1_del
,
346 if (hub_u2_del
> hub_u1_del
)
347 port_to_port_delay
= 1 + hub_u2_del
- hub_u1_del
;
349 port_to_port_delay
= 1 + hub_u1_del
;
351 usb_set_lpm_pel(udev
, &udev
->u2_params
, udev_u2_del
,
352 hub
, &udev
->parent
->u2_params
, hub_u2_del
,
355 /* Now that we've got PEL, calculate SEL. */
356 usb_set_lpm_sel(udev
, &udev
->u1_params
);
357 usb_set_lpm_sel(udev
, &udev
->u2_params
);
360 /* USB 2.0 spec Section 11.24.4.5 */
361 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
)
366 if (hub_is_superspeed(hdev
)) {
367 dtype
= USB_DT_SS_HUB
;
368 size
= USB_DT_SS_HUB_SIZE
;
371 size
= sizeof(struct usb_hub_descriptor
);
374 for (i
= 0; i
< 3; i
++) {
375 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
376 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
377 dtype
<< 8, 0, data
, size
,
378 USB_CTRL_GET_TIMEOUT
);
379 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
386 * USB 2.0 spec Section 11.24.2.1
388 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
390 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
391 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
395 * USB 2.0 spec Section 11.24.2.2
397 int usb_clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
399 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
400 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
405 * USB 2.0 spec Section 11.24.2.13
407 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
409 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
410 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
415 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
416 * for info about using port indicators
418 static void set_port_led(
424 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
425 USB_PORT_FEAT_INDICATOR
);
427 dev_dbg (hub
->intfdev
,
428 "port %d indicator %s status %d\n",
430 ({ char *s
; switch (selector
) {
431 case HUB_LED_AMBER
: s
= "amber"; break;
432 case HUB_LED_GREEN
: s
= "green"; break;
433 case HUB_LED_OFF
: s
= "off"; break;
434 case HUB_LED_AUTO
: s
= "auto"; break;
435 default: s
= "??"; break;
440 #define LED_CYCLE_PERIOD ((2*HZ)/3)
442 static void led_work (struct work_struct
*work
)
444 struct usb_hub
*hub
=
445 container_of(work
, struct usb_hub
, leds
.work
);
446 struct usb_device
*hdev
= hub
->hdev
;
448 unsigned changed
= 0;
451 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
454 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
455 unsigned selector
, mode
;
457 /* 30%-50% duty cycle */
459 switch (hub
->indicator
[i
]) {
461 case INDICATOR_CYCLE
:
463 selector
= HUB_LED_AUTO
;
464 mode
= INDICATOR_AUTO
;
466 /* blinking green = sw attention */
467 case INDICATOR_GREEN_BLINK
:
468 selector
= HUB_LED_GREEN
;
469 mode
= INDICATOR_GREEN_BLINK_OFF
;
471 case INDICATOR_GREEN_BLINK_OFF
:
472 selector
= HUB_LED_OFF
;
473 mode
= INDICATOR_GREEN_BLINK
;
475 /* blinking amber = hw attention */
476 case INDICATOR_AMBER_BLINK
:
477 selector
= HUB_LED_AMBER
;
478 mode
= INDICATOR_AMBER_BLINK_OFF
;
480 case INDICATOR_AMBER_BLINK_OFF
:
481 selector
= HUB_LED_OFF
;
482 mode
= INDICATOR_AMBER_BLINK
;
484 /* blink green/amber = reserved */
485 case INDICATOR_ALT_BLINK
:
486 selector
= HUB_LED_GREEN
;
487 mode
= INDICATOR_ALT_BLINK_OFF
;
489 case INDICATOR_ALT_BLINK_OFF
:
490 selector
= HUB_LED_AMBER
;
491 mode
= INDICATOR_ALT_BLINK
;
496 if (selector
!= HUB_LED_AUTO
)
498 set_port_led(hub
, i
+ 1, selector
);
499 hub
->indicator
[i
] = mode
;
501 if (!changed
&& blinkenlights
) {
503 cursor
%= hub
->descriptor
->bNbrPorts
;
504 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
505 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
509 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
512 /* use a short timeout for hub/port status fetches */
513 #define USB_STS_TIMEOUT 1000
514 #define USB_STS_RETRIES 5
517 * USB 2.0 spec Section 11.24.2.6
519 static int get_hub_status(struct usb_device
*hdev
,
520 struct usb_hub_status
*data
)
522 int i
, status
= -ETIMEDOUT
;
524 for (i
= 0; i
< USB_STS_RETRIES
&&
525 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
526 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
527 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
528 data
, sizeof(*data
), USB_STS_TIMEOUT
);
534 * USB 2.0 spec Section 11.24.2.7
536 static int get_port_status(struct usb_device
*hdev
, int port1
,
537 struct usb_port_status
*data
)
539 int i
, status
= -ETIMEDOUT
;
541 for (i
= 0; i
< USB_STS_RETRIES
&&
542 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
543 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
544 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
545 data
, sizeof(*data
), USB_STS_TIMEOUT
);
550 static int hub_port_status(struct usb_hub
*hub
, int port1
,
551 u16
*status
, u16
*change
)
555 mutex_lock(&hub
->status_mutex
);
556 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
559 dev_err(hub
->intfdev
,
560 "%s failed (err = %d)\n", __func__
, ret
);
564 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
565 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
569 mutex_unlock(&hub
->status_mutex
);
573 static void kick_khubd(struct usb_hub
*hub
)
577 spin_lock_irqsave(&hub_event_lock
, flags
);
578 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
579 list_add_tail(&hub
->event_list
, &hub_event_list
);
581 /* Suppress autosuspend until khubd runs */
582 usb_autopm_get_interface_no_resume(
583 to_usb_interface(hub
->intfdev
));
584 wake_up(&khubd_wait
);
586 spin_unlock_irqrestore(&hub_event_lock
, flags
);
589 void usb_kick_khubd(struct usb_device
*hdev
)
591 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
598 * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
599 * Notification, which indicates it had initiated remote wakeup.
601 * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
602 * device initiates resume, so the USB core will not receive notice of the
603 * resume through the normal hub interrupt URB.
605 void usb_wakeup_notification(struct usb_device
*hdev
,
606 unsigned int portnum
)
613 hub
= usb_hub_to_struct_hub(hdev
);
615 set_bit(portnum
, hub
->wakeup_bits
);
619 EXPORT_SYMBOL_GPL(usb_wakeup_notification
);
621 /* completion function, fires on port status changes and various faults */
622 static void hub_irq(struct urb
*urb
)
624 struct usb_hub
*hub
= urb
->context
;
625 int status
= urb
->status
;
630 case -ENOENT
: /* synchronous unlink */
631 case -ECONNRESET
: /* async unlink */
632 case -ESHUTDOWN
: /* hardware going away */
635 default: /* presumably an error */
636 /* Cause a hub reset after 10 consecutive errors */
637 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
638 if ((++hub
->nerrors
< 10) || hub
->error
)
643 /* let khubd handle things */
644 case 0: /* we got data: port status changed */
646 for (i
= 0; i
< urb
->actual_length
; ++i
)
647 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
649 hub
->event_bits
[0] = bits
;
655 /* Something happened, let khubd figure it out */
662 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
663 && status
!= -ENODEV
&& status
!= -EPERM
)
664 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
667 /* USB 2.0 spec Section 11.24.2.3 */
669 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
671 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
672 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
677 * enumeration blocks khubd for a long time. we use keventd instead, since
678 * long blocking there is the exception, not the rule. accordingly, HCDs
679 * talking to TTs must queue control transfers (not just bulk and iso), so
680 * both can talk to the same hub concurrently.
682 static void hub_tt_work(struct work_struct
*work
)
684 struct usb_hub
*hub
=
685 container_of(work
, struct usb_hub
, tt
.clear_work
);
688 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
689 while (!list_empty(&hub
->tt
.clear_list
)) {
690 struct list_head
*next
;
691 struct usb_tt_clear
*clear
;
692 struct usb_device
*hdev
= hub
->hdev
;
693 const struct hc_driver
*drv
;
696 next
= hub
->tt
.clear_list
.next
;
697 clear
= list_entry (next
, struct usb_tt_clear
, clear_list
);
698 list_del (&clear
->clear_list
);
700 /* drop lock so HCD can concurrently report other TT errors */
701 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
702 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
703 if (status
&& status
!= -ENODEV
)
705 "clear tt %d (%04x) error %d\n",
706 clear
->tt
, clear
->devinfo
, status
);
708 /* Tell the HCD, even if the operation failed */
709 drv
= clear
->hcd
->driver
;
710 if (drv
->clear_tt_buffer_complete
)
711 (drv
->clear_tt_buffer_complete
)(clear
->hcd
, clear
->ep
);
714 spin_lock_irqsave(&hub
->tt
.lock
, flags
);
716 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
720 * usb_hub_set_port_power - control hub port's power state
723 * @set: expected status
725 * call this function to control port's power via setting or
726 * clearing the port's PORT_POWER feature.
728 int usb_hub_set_port_power(struct usb_device
*hdev
, int port1
,
732 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
733 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
736 ret
= set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
738 ret
= usb_clear_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
741 port_dev
->power_is_on
= set
;
746 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
747 * @urb: an URB associated with the failed or incomplete split transaction
749 * High speed HCDs use this to tell the hub driver that some split control or
750 * bulk transaction failed in a way that requires clearing internal state of
751 * a transaction translator. This is normally detected (and reported) from
754 * It may not be possible for that hub to handle additional full (or low)
755 * speed transactions until that state is fully cleared out.
757 int usb_hub_clear_tt_buffer(struct urb
*urb
)
759 struct usb_device
*udev
= urb
->dev
;
760 int pipe
= urb
->pipe
;
761 struct usb_tt
*tt
= udev
->tt
;
763 struct usb_tt_clear
*clear
;
765 /* we've got to cope with an arbitrary number of pending TT clears,
766 * since each TT has "at least two" buffers that can need it (and
767 * there can be many TTs per hub). even if they're uncommon.
769 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
770 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
771 /* FIXME recover somehow ... RESET_TT? */
775 /* info that CLEAR_TT_BUFFER needs */
776 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
777 clear
->devinfo
= usb_pipeendpoint (pipe
);
778 clear
->devinfo
|= udev
->devnum
<< 4;
779 clear
->devinfo
|= usb_pipecontrol (pipe
)
780 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
781 : (USB_ENDPOINT_XFER_BULK
<< 11);
782 if (usb_pipein (pipe
))
783 clear
->devinfo
|= 1 << 15;
785 /* info for completion callback */
786 clear
->hcd
= bus_to_hcd(udev
->bus
);
789 /* tell keventd to clear state for this TT */
790 spin_lock_irqsave (&tt
->lock
, flags
);
791 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
792 schedule_work(&tt
->clear_work
);
793 spin_unlock_irqrestore (&tt
->lock
, flags
);
796 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer
);
798 /* If do_delay is false, return the number of milliseconds the caller
801 static unsigned hub_power_on(struct usb_hub
*hub
, bool do_delay
)
804 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
806 u16 wHubCharacteristics
=
807 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
809 /* Enable power on each port. Some hubs have reserved values
810 * of LPSM (> 2) in their descriptors, even though they are
811 * USB 2.0 hubs. Some hubs do not implement port-power switching
812 * but only emulate it. In all cases, the ports won't work
813 * unless we send these messages to the hub.
815 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
816 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
818 dev_dbg(hub
->intfdev
, "trying to enable port power on "
819 "non-switchable hub\n");
820 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
821 if (hub
->ports
[port1
- 1]->power_is_on
)
822 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
824 usb_clear_port_feature(hub
->hdev
, port1
,
825 USB_PORT_FEAT_POWER
);
827 /* Wait at least 100 msec for power to become stable */
828 delay
= max(pgood_delay
, (unsigned) 100);
834 static int hub_hub_status(struct usb_hub
*hub
,
835 u16
*status
, u16
*change
)
839 mutex_lock(&hub
->status_mutex
);
840 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
843 dev_err(hub
->intfdev
,
844 "%s failed (err = %d)\n", __func__
, ret
);
846 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
847 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
850 mutex_unlock(&hub
->status_mutex
);
854 static int hub_set_port_link_state(struct usb_hub
*hub
, int port1
,
855 unsigned int link_status
)
857 return set_port_feature(hub
->hdev
,
858 port1
| (link_status
<< 3),
859 USB_PORT_FEAT_LINK_STATE
);
863 * If USB 3.0 ports are placed into the Disabled state, they will no longer
864 * detect any device connects or disconnects. This is generally not what the
865 * USB core wants, since it expects a disabled port to produce a port status
866 * change event when a new device connects.
868 * Instead, set the link state to Disabled, wait for the link to settle into
869 * that state, clear any change bits, and then put the port into the RxDetect
872 static int hub_usb3_port_disable(struct usb_hub
*hub
, int port1
)
876 u16 portchange
, portstatus
;
878 if (!hub_is_superspeed(hub
->hdev
))
881 ret
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_SS_DISABLED
);
885 /* Wait for the link to enter the disabled state. */
886 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
887 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
891 if ((portstatus
& USB_PORT_STAT_LINK_STATE
) ==
892 USB_SS_PORT_LS_SS_DISABLED
)
894 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
896 msleep(HUB_DEBOUNCE_STEP
);
898 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
899 dev_warn(hub
->intfdev
, "Could not disable port %d after %d ms\n",
902 return hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_RX_DETECT
);
905 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
907 struct usb_device
*hdev
= hub
->hdev
;
910 if (hub
->ports
[port1
- 1]->child
&& set_state
)
911 usb_set_device_state(hub
->ports
[port1
- 1]->child
,
912 USB_STATE_NOTATTACHED
);
914 if (hub_is_superspeed(hub
->hdev
))
915 ret
= hub_usb3_port_disable(hub
, port1
);
917 ret
= usb_clear_port_feature(hdev
, port1
,
918 USB_PORT_FEAT_ENABLE
);
920 if (ret
&& ret
!= -ENODEV
)
921 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
927 * Disable a port and mark a logical connect-change event, so that some
928 * time later khubd will disconnect() any existing usb_device on the port
929 * and will re-enumerate if there actually is a device attached.
931 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
933 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
934 hub_port_disable(hub
, port1
, 1);
936 /* FIXME let caller ask to power down the port:
937 * - some devices won't enumerate without a VBUS power cycle
938 * - SRP saves power that way
939 * - ... new call, TBD ...
940 * That's easy if this hub can switch power per-port, and
941 * khubd reactivates the port later (timer, SRP, etc).
942 * Powerdown must be optional, because of reset/DFU.
945 set_bit(port1
, hub
->change_bits
);
950 * usb_remove_device - disable a device's port on its parent hub
951 * @udev: device to be disabled and removed
952 * Context: @udev locked, must be able to sleep.
954 * After @udev's port has been disabled, khubd is notified and it will
955 * see that the device has been disconnected. When the device is
956 * physically unplugged and something is plugged in, the events will
957 * be received and processed normally.
959 int usb_remove_device(struct usb_device
*udev
)
962 struct usb_interface
*intf
;
964 if (!udev
->parent
) /* Can't remove a root hub */
966 hub
= usb_hub_to_struct_hub(udev
->parent
);
967 intf
= to_usb_interface(hub
->intfdev
);
969 usb_autopm_get_interface(intf
);
970 set_bit(udev
->portnum
, hub
->removed_bits
);
971 hub_port_logical_disconnect(hub
, udev
->portnum
);
972 usb_autopm_put_interface(intf
);
976 enum hub_activation_type
{
977 HUB_INIT
, HUB_INIT2
, HUB_INIT3
, /* INITs must come first */
978 HUB_POST_RESET
, HUB_RESUME
, HUB_RESET_RESUME
,
981 static void hub_init_func2(struct work_struct
*ws
);
982 static void hub_init_func3(struct work_struct
*ws
);
984 static void hub_activate(struct usb_hub
*hub
, enum hub_activation_type type
)
986 struct usb_device
*hdev
= hub
->hdev
;
991 bool need_debounce_delay
= false;
994 /* Continue a partial initialization */
995 if (type
== HUB_INIT2
)
997 if (type
== HUB_INIT3
)
1000 /* The superspeed hub except for root hub has to use Hub Depth
1001 * value as an offset into the route string to locate the bits
1002 * it uses to determine the downstream port number. So hub driver
1003 * should send a set hub depth request to superspeed hub after
1004 * the superspeed hub is set configuration in initialization or
1007 * After a resume, port power should still be on.
1008 * For any other type of activation, turn it on.
1010 if (type
!= HUB_RESUME
) {
1011 if (hdev
->parent
&& hub_is_superspeed(hdev
)) {
1012 ret
= usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
1013 HUB_SET_DEPTH
, USB_RT_HUB
,
1014 hdev
->level
- 1, 0, NULL
, 0,
1015 USB_CTRL_SET_TIMEOUT
);
1017 dev_err(hub
->intfdev
,
1018 "set hub depth failed\n");
1021 /* Speed up system boot by using a delayed_work for the
1022 * hub's initial power-up delays. This is pretty awkward
1023 * and the implementation looks like a home-brewed sort of
1024 * setjmp/longjmp, but it saves at least 100 ms for each
1025 * root hub (assuming usbcore is compiled into the kernel
1026 * rather than as a module). It adds up.
1028 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
1029 * because for those activation types the ports have to be
1030 * operational when we return. In theory this could be done
1031 * for HUB_POST_RESET, but it's easier not to.
1033 if (type
== HUB_INIT
) {
1034 delay
= hub_power_on(hub
, false);
1035 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func2
);
1036 schedule_delayed_work(&hub
->init_work
,
1037 msecs_to_jiffies(delay
));
1039 /* Suppress autosuspend until init is done */
1040 usb_autopm_get_interface_no_resume(
1041 to_usb_interface(hub
->intfdev
));
1042 return; /* Continues at init2: below */
1043 } else if (type
== HUB_RESET_RESUME
) {
1044 /* The internal host controller state for the hub device
1045 * may be gone after a host power loss on system resume.
1046 * Update the device's info so the HW knows it's a hub.
1048 hcd
= bus_to_hcd(hdev
->bus
);
1049 if (hcd
->driver
->update_hub_device
) {
1050 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1051 &hub
->tt
, GFP_NOIO
);
1053 dev_err(hub
->intfdev
, "Host not "
1054 "accepting hub info "
1056 dev_err(hub
->intfdev
, "LS/FS devices "
1057 "and hubs may not work "
1058 "under this hub\n.");
1061 hub_power_on(hub
, true);
1063 hub_power_on(hub
, true);
1068 /* Check each port and set hub->change_bits to let khubd know
1069 * which ports need attention.
1071 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
1072 struct usb_device
*udev
= hub
->ports
[port1
- 1]->child
;
1073 u16 portstatus
, portchange
;
1075 portstatus
= portchange
= 0;
1076 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1077 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
1078 dev_dbg(hub
->intfdev
,
1079 "port %d: status %04x change %04x\n",
1080 port1
, portstatus
, portchange
);
1082 /* After anything other than HUB_RESUME (i.e., initialization
1083 * or any sort of reset), every port should be disabled.
1084 * Unconnected ports should likewise be disabled (paranoia),
1085 * and so should ports for which we have no usb_device.
1087 if ((portstatus
& USB_PORT_STAT_ENABLE
) && (
1088 type
!= HUB_RESUME
||
1089 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
1091 udev
->state
== USB_STATE_NOTATTACHED
)) {
1093 * USB3 protocol ports will automatically transition
1094 * to Enabled state when detect an USB3.0 device attach.
1095 * Do not disable USB3 protocol ports.
1097 if (!hub_is_superspeed(hdev
)) {
1098 usb_clear_port_feature(hdev
, port1
,
1099 USB_PORT_FEAT_ENABLE
);
1100 portstatus
&= ~USB_PORT_STAT_ENABLE
;
1102 /* Pretend that power was lost for USB3 devs */
1103 portstatus
&= ~USB_PORT_STAT_ENABLE
;
1107 /* Clear status-change flags; we'll debounce later */
1108 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
1109 need_debounce_delay
= true;
1110 usb_clear_port_feature(hub
->hdev
, port1
,
1111 USB_PORT_FEAT_C_CONNECTION
);
1113 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
1114 need_debounce_delay
= true;
1115 usb_clear_port_feature(hub
->hdev
, port1
,
1116 USB_PORT_FEAT_C_ENABLE
);
1118 if ((portchange
& USB_PORT_STAT_C_BH_RESET
) &&
1119 hub_is_superspeed(hub
->hdev
)) {
1120 need_debounce_delay
= true;
1121 usb_clear_port_feature(hub
->hdev
, port1
,
1122 USB_PORT_FEAT_C_BH_PORT_RESET
);
1124 /* We can forget about a "removed" device when there's a
1125 * physical disconnect or the connect status changes.
1127 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
1128 (portchange
& USB_PORT_STAT_C_CONNECTION
))
1129 clear_bit(port1
, hub
->removed_bits
);
1131 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
1132 /* Tell khubd to disconnect the device or
1133 * check for a new connection
1135 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
1136 set_bit(port1
, hub
->change_bits
);
1138 } else if (portstatus
& USB_PORT_STAT_ENABLE
) {
1139 bool port_resumed
= (portstatus
&
1140 USB_PORT_STAT_LINK_STATE
) ==
1142 /* The power session apparently survived the resume.
1143 * If there was an overcurrent or suspend change
1144 * (i.e., remote wakeup request), have khubd
1145 * take care of it. Look at the port link state
1146 * for USB 3.0 hubs, since they don't have a suspend
1147 * change bit, and they don't set the port link change
1148 * bit on device-initiated resume.
1150 if (portchange
|| (hub_is_superspeed(hub
->hdev
) &&
1152 set_bit(port1
, hub
->change_bits
);
1154 } else if (udev
->persist_enabled
) {
1155 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
1158 udev
->reset_resume
= 1;
1160 /* Don't set the change_bits when the device
1163 if (port_dev
->power_is_on
)
1164 set_bit(port1
, hub
->change_bits
);
1167 /* The power session is gone; tell khubd */
1168 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1169 set_bit(port1
, hub
->change_bits
);
1173 /* If no port-status-change flags were set, we don't need any
1174 * debouncing. If flags were set we can try to debounce the
1175 * ports all at once right now, instead of letting khubd do them
1176 * one at a time later on.
1178 * If any port-status changes do occur during this delay, khubd
1179 * will see them later and handle them normally.
1181 if (need_debounce_delay
) {
1182 delay
= HUB_DEBOUNCE_STABLE
;
1184 /* Don't do a long sleep inside a workqueue routine */
1185 if (type
== HUB_INIT2
) {
1186 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func3
);
1187 schedule_delayed_work(&hub
->init_work
,
1188 msecs_to_jiffies(delay
));
1189 return; /* Continues at init3: below */
1197 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
1199 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
1200 if (hub
->has_indicators
&& blinkenlights
)
1201 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
1203 /* Scan all ports that need attention */
1206 /* Allow autosuspend if it was suppressed */
1207 if (type
<= HUB_INIT3
)
1208 usb_autopm_put_interface_async(to_usb_interface(hub
->intfdev
));
1211 /* Implement the continuations for the delays above */
1212 static void hub_init_func2(struct work_struct
*ws
)
1214 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
1216 hub_activate(hub
, HUB_INIT2
);
1219 static void hub_init_func3(struct work_struct
*ws
)
1221 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
1223 hub_activate(hub
, HUB_INIT3
);
1226 enum hub_quiescing_type
{
1227 HUB_DISCONNECT
, HUB_PRE_RESET
, HUB_SUSPEND
1230 static void hub_quiesce(struct usb_hub
*hub
, enum hub_quiescing_type type
)
1232 struct usb_device
*hdev
= hub
->hdev
;
1235 cancel_delayed_work_sync(&hub
->init_work
);
1237 /* khubd and related activity won't re-trigger */
1240 if (type
!= HUB_SUSPEND
) {
1241 /* Disconnect all the children */
1242 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
1243 if (hub
->ports
[i
]->child
)
1244 usb_disconnect(&hub
->ports
[i
]->child
);
1248 /* Stop khubd and related activity */
1249 usb_kill_urb(hub
->urb
);
1250 if (hub
->has_indicators
)
1251 cancel_delayed_work_sync(&hub
->leds
);
1253 flush_work(&hub
->tt
.clear_work
);
1256 /* caller has locked the hub device */
1257 static int hub_pre_reset(struct usb_interface
*intf
)
1259 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1261 hub_quiesce(hub
, HUB_PRE_RESET
);
1265 /* caller has locked the hub device */
1266 static int hub_post_reset(struct usb_interface
*intf
)
1268 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1270 hub_activate(hub
, HUB_POST_RESET
);
1274 static int hub_configure(struct usb_hub
*hub
,
1275 struct usb_endpoint_descriptor
*endpoint
)
1277 struct usb_hcd
*hcd
;
1278 struct usb_device
*hdev
= hub
->hdev
;
1279 struct device
*hub_dev
= hub
->intfdev
;
1280 u16 hubstatus
, hubchange
;
1281 u16 wHubCharacteristics
;
1284 char *message
= "out of memory";
1288 hub
->buffer
= kmalloc(sizeof(*hub
->buffer
), GFP_KERNEL
);
1294 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
1299 mutex_init(&hub
->status_mutex
);
1301 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
1302 if (!hub
->descriptor
) {
1307 /* Request the entire hub descriptor.
1308 * hub->descriptor can handle USB_MAXCHILDREN ports,
1309 * but the hub can/will return fewer bytes here.
1311 ret
= get_hub_descriptor(hdev
, hub
->descriptor
);
1313 message
= "can't read hub descriptor";
1315 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
1316 message
= "hub has too many ports!";
1319 } else if (hub
->descriptor
->bNbrPorts
== 0) {
1320 message
= "hub doesn't have any ports!";
1325 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
1326 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
1327 (hdev
->maxchild
== 1) ? "" : "s");
1329 hub
->ports
= kzalloc(hdev
->maxchild
* sizeof(struct usb_port
*),
1336 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
1337 if (hub_is_superspeed(hdev
)) {
1345 /* FIXME for USB 3.0, skip for now */
1346 if ((wHubCharacteristics
& HUB_CHAR_COMPOUND
) &&
1347 !(hub_is_superspeed(hdev
))) {
1349 char portstr
[USB_MAXCHILDREN
+ 1];
1351 for (i
= 0; i
< hdev
->maxchild
; i
++)
1352 portstr
[i
] = hub
->descriptor
->u
.hs
.DeviceRemovable
1353 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
1355 portstr
[hdev
->maxchild
] = 0;
1356 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
1358 dev_dbg(hub_dev
, "standalone hub\n");
1360 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
1361 case HUB_CHAR_COMMON_LPSM
:
1362 dev_dbg(hub_dev
, "ganged power switching\n");
1364 case HUB_CHAR_INDV_PORT_LPSM
:
1365 dev_dbg(hub_dev
, "individual port power switching\n");
1367 case HUB_CHAR_NO_LPSM
:
1369 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
1373 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
1374 case HUB_CHAR_COMMON_OCPM
:
1375 dev_dbg(hub_dev
, "global over-current protection\n");
1377 case HUB_CHAR_INDV_PORT_OCPM
:
1378 dev_dbg(hub_dev
, "individual port over-current protection\n");
1380 case HUB_CHAR_NO_OCPM
:
1382 dev_dbg(hub_dev
, "no over-current protection\n");
1386 spin_lock_init (&hub
->tt
.lock
);
1387 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
1388 INIT_WORK(&hub
->tt
.clear_work
, hub_tt_work
);
1389 switch (hdev
->descriptor
.bDeviceProtocol
) {
1392 case USB_HUB_PR_HS_SINGLE_TT
:
1393 dev_dbg(hub_dev
, "Single TT\n");
1396 case USB_HUB_PR_HS_MULTI_TT
:
1397 ret
= usb_set_interface(hdev
, 0, 1);
1399 dev_dbg(hub_dev
, "TT per port\n");
1402 dev_err(hub_dev
, "Using single TT (err %d)\n",
1407 /* USB 3.0 hubs don't have a TT */
1410 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
1411 hdev
->descriptor
.bDeviceProtocol
);
1415 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1416 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
1417 case HUB_TTTT_8_BITS
:
1418 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
1419 hub
->tt
.think_time
= 666;
1420 dev_dbg(hub_dev
, "TT requires at most %d "
1421 "FS bit times (%d ns)\n",
1422 8, hub
->tt
.think_time
);
1425 case HUB_TTTT_16_BITS
:
1426 hub
->tt
.think_time
= 666 * 2;
1427 dev_dbg(hub_dev
, "TT requires at most %d "
1428 "FS bit times (%d ns)\n",
1429 16, hub
->tt
.think_time
);
1431 case HUB_TTTT_24_BITS
:
1432 hub
->tt
.think_time
= 666 * 3;
1433 dev_dbg(hub_dev
, "TT requires at most %d "
1434 "FS bit times (%d ns)\n",
1435 24, hub
->tt
.think_time
);
1437 case HUB_TTTT_32_BITS
:
1438 hub
->tt
.think_time
= 666 * 4;
1439 dev_dbg(hub_dev
, "TT requires at most %d "
1440 "FS bit times (%d ns)\n",
1441 32, hub
->tt
.think_time
);
1445 /* probe() zeroes hub->indicator[] */
1446 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
1447 hub
->has_indicators
= 1;
1448 dev_dbg(hub_dev
, "Port indicators are supported\n");
1451 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
1452 hub
->descriptor
->bPwrOn2PwrGood
* 2);
1454 /* power budgeting mostly matters with bus-powered hubs,
1455 * and battery-powered root hubs (may provide just 8 mA).
1457 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
1459 message
= "can't get hub status";
1462 le16_to_cpus(&hubstatus
);
1463 hcd
= bus_to_hcd(hdev
->bus
);
1464 if (hdev
== hdev
->bus
->root_hub
) {
1465 if (hcd
->power_budget
> 0)
1466 hdev
->bus_mA
= hcd
->power_budget
;
1468 hdev
->bus_mA
= full_load
* hdev
->maxchild
;
1469 if (hdev
->bus_mA
>= full_load
)
1470 hub
->mA_per_port
= full_load
;
1472 hub
->mA_per_port
= hdev
->bus_mA
;
1473 hub
->limited_power
= 1;
1475 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
1476 int remaining
= hdev
->bus_mA
-
1477 hub
->descriptor
->bHubContrCurrent
;
1479 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
1480 hub
->descriptor
->bHubContrCurrent
);
1481 hub
->limited_power
= 1;
1483 if (remaining
< hdev
->maxchild
* unit_load
)
1485 "insufficient power available "
1486 "to use all downstream ports\n");
1487 hub
->mA_per_port
= unit_load
; /* 7.2.1 */
1489 } else { /* Self-powered external hub */
1490 /* FIXME: What about battery-powered external hubs that
1491 * provide less current per port? */
1492 hub
->mA_per_port
= full_load
;
1494 if (hub
->mA_per_port
< full_load
)
1495 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
1498 /* Update the HCD's internal representation of this hub before khubd
1499 * starts getting port status changes for devices under the hub.
1501 if (hcd
->driver
->update_hub_device
) {
1502 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1503 &hub
->tt
, GFP_KERNEL
);
1505 message
= "can't update HCD hub info";
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 for (i
= 0; i
< hdev
->maxchild
; i
++)
1552 if (usb_hub_create_port_device(hub
, i
+ 1) < 0)
1553 dev_err(hub
->intfdev
,
1554 "couldn't create port%d device.\n", i
+ 1);
1556 usb_hub_adjust_deviceremovable(hdev
, hub
->descriptor
);
1558 hub_activate(hub
, HUB_INIT
);
1562 dev_err (hub_dev
, "config failed, %s (err %d)\n",
1564 /* hub_disconnect() frees urb and descriptor */
1568 static void hub_release(struct kref
*kref
)
1570 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1572 usb_put_intf(to_usb_interface(hub
->intfdev
));
1576 static unsigned highspeed_hubs
;
1578 static void hub_disconnect(struct usb_interface
*intf
)
1580 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1581 struct usb_device
*hdev
= interface_to_usbdev(intf
);
1584 /* Take the hub off the event list and don't let it be added again */
1585 spin_lock_irq(&hub_event_lock
);
1586 if (!list_empty(&hub
->event_list
)) {
1587 list_del_init(&hub
->event_list
);
1588 usb_autopm_put_interface_no_suspend(intf
);
1590 hub
->disconnected
= 1;
1591 spin_unlock_irq(&hub_event_lock
);
1593 /* Disconnect all children and quiesce the hub */
1595 hub_quiesce(hub
, HUB_DISCONNECT
);
1597 usb_set_intfdata (intf
, NULL
);
1599 for (i
= 0; i
< hdev
->maxchild
; i
++)
1600 usb_hub_remove_port_device(hub
, i
+ 1);
1601 hub
->hdev
->maxchild
= 0;
1603 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1606 usb_free_urb(hub
->urb
);
1608 kfree(hub
->descriptor
);
1612 pm_suspend_ignore_children(&intf
->dev
, false);
1613 kref_put(&hub
->kref
, hub_release
);
1616 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1618 struct usb_host_interface
*desc
;
1619 struct usb_endpoint_descriptor
*endpoint
;
1620 struct usb_device
*hdev
;
1621 struct usb_hub
*hub
;
1623 desc
= intf
->cur_altsetting
;
1624 hdev
= interface_to_usbdev(intf
);
1627 * Set default autosuspend delay as 0 to speedup bus suspend,
1628 * based on the below considerations:
1630 * - Unlike other drivers, the hub driver does not rely on the
1631 * autosuspend delay to provide enough time to handle a wakeup
1632 * event, and the submitted status URB is just to check future
1633 * change on hub downstream ports, so it is safe to do it.
1635 * - The patch might cause one or more auto supend/resume for
1636 * below very rare devices when they are plugged into hub
1639 * devices having trouble initializing, and disconnect
1640 * themselves from the bus and then reconnect a second
1643 * devices just for downloading firmware, and disconnects
1644 * themselves after completing it
1646 * For these quite rare devices, their drivers may change the
1647 * autosuspend delay of their parent hub in the probe() to one
1648 * appropriate value to avoid the subtle problem if someone
1651 * - The patch may cause one or more auto suspend/resume on
1652 * hub during running 'lsusb', but it is probably too
1653 * infrequent to worry about.
1655 * - Change autosuspend delay of hub can avoid unnecessary auto
1656 * suspend timer for hub, also may decrease power consumption
1659 pm_runtime_set_autosuspend_delay(&hdev
->dev
, 0);
1661 /* Hubs have proper suspend/resume support. */
1662 usb_enable_autosuspend(hdev
);
1664 if (hdev
->level
== MAX_TOPO_LEVEL
) {
1666 "Unsupported bus topology: hub nested too deep\n");
1670 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1672 dev_warn(&intf
->dev
, "ignoring external hub\n");
1677 /* Some hubs have a subclass of 1, which AFAICT according to the */
1678 /* specs is not defined, but it works */
1679 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1680 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1682 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
1686 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1687 if (desc
->desc
.bNumEndpoints
!= 1)
1688 goto descriptor_error
;
1690 endpoint
= &desc
->endpoint
[0].desc
;
1692 /* If it's not an interrupt in endpoint, we'd better punt! */
1693 if (!usb_endpoint_is_int_in(endpoint
))
1694 goto descriptor_error
;
1696 /* We found a hub */
1697 dev_info (&intf
->dev
, "USB hub found\n");
1699 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1701 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1705 kref_init(&hub
->kref
);
1706 INIT_LIST_HEAD(&hub
->event_list
);
1707 hub
->intfdev
= &intf
->dev
;
1709 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1710 INIT_DELAYED_WORK(&hub
->init_work
, NULL
);
1713 usb_set_intfdata (intf
, hub
);
1714 intf
->needs_remote_wakeup
= 1;
1715 pm_suspend_ignore_children(&intf
->dev
, true);
1717 if (hdev
->speed
== USB_SPEED_HIGH
)
1720 if (id
->driver_info
& HUB_QUIRK_CHECK_PORT_AUTOSUSPEND
)
1721 hub
->quirk_check_port_auto_suspend
= 1;
1723 if (hub_configure(hub
, endpoint
) >= 0)
1726 hub_disconnect (intf
);
1731 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1733 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1734 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
1736 /* assert ifno == 0 (part of hub spec) */
1738 case USBDEVFS_HUB_PORTINFO
: {
1739 struct usbdevfs_hub_portinfo
*info
= user_data
;
1742 spin_lock_irq(&device_state_lock
);
1743 if (hdev
->devnum
<= 0)
1746 info
->nports
= hdev
->maxchild
;
1747 for (i
= 0; i
< info
->nports
; i
++) {
1748 if (hub
->ports
[i
]->child
== NULL
)
1752 hub
->ports
[i
]->child
->devnum
;
1755 spin_unlock_irq(&device_state_lock
);
1757 return info
->nports
+ 1;
1766 * Allow user programs to claim ports on a hub. When a device is attached
1767 * to one of these "claimed" ports, the program will "own" the device.
1769 static int find_port_owner(struct usb_device
*hdev
, unsigned port1
,
1770 struct dev_state
***ppowner
)
1772 if (hdev
->state
== USB_STATE_NOTATTACHED
)
1774 if (port1
== 0 || port1
> hdev
->maxchild
)
1777 /* This assumes that devices not managed by the hub driver
1778 * will always have maxchild equal to 0.
1780 *ppowner
= &(usb_hub_to_struct_hub(hdev
)->ports
[port1
- 1]->port_owner
);
1784 /* In the following three functions, the caller must hold hdev's lock */
1785 int usb_hub_claim_port(struct usb_device
*hdev
, unsigned port1
,
1786 struct dev_state
*owner
)
1789 struct dev_state
**powner
;
1791 rc
= find_port_owner(hdev
, port1
, &powner
);
1800 int usb_hub_release_port(struct usb_device
*hdev
, unsigned port1
,
1801 struct dev_state
*owner
)
1804 struct dev_state
**powner
;
1806 rc
= find_port_owner(hdev
, port1
, &powner
);
1809 if (*powner
!= owner
)
1815 void usb_hub_release_all_ports(struct usb_device
*hdev
, struct dev_state
*owner
)
1817 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
1820 for (n
= 0; n
< hdev
->maxchild
; n
++) {
1821 if (hub
->ports
[n
]->port_owner
== owner
)
1822 hub
->ports
[n
]->port_owner
= NULL
;
1827 /* The caller must hold udev's lock */
1828 bool usb_device_is_owned(struct usb_device
*udev
)
1830 struct usb_hub
*hub
;
1832 if (udev
->state
== USB_STATE_NOTATTACHED
|| !udev
->parent
)
1834 hub
= usb_hub_to_struct_hub(udev
->parent
);
1835 return !!hub
->ports
[udev
->portnum
- 1]->port_owner
;
1838 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1840 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
1843 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1844 if (hub
->ports
[i
]->child
)
1845 recursively_mark_NOTATTACHED(hub
->ports
[i
]->child
);
1847 if (udev
->state
== USB_STATE_SUSPENDED
)
1848 udev
->active_duration
-= jiffies
;
1849 udev
->state
= USB_STATE_NOTATTACHED
;
1853 * usb_set_device_state - change a device's current state (usbcore, hcds)
1854 * @udev: pointer to device whose state should be changed
1855 * @new_state: new state value to be stored
1857 * udev->state is _not_ fully protected by the device lock. Although
1858 * most transitions are made only while holding the lock, the state can
1859 * can change to USB_STATE_NOTATTACHED at almost any time. This
1860 * is so that devices can be marked as disconnected as soon as possible,
1861 * without having to wait for any semaphores to be released. As a result,
1862 * all changes to any device's state must be protected by the
1863 * device_state_lock spinlock.
1865 * Once a device has been added to the device tree, all changes to its state
1866 * should be made using this routine. The state should _not_ be set directly.
1868 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1869 * Otherwise udev->state is set to new_state, and if new_state is
1870 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1871 * to USB_STATE_NOTATTACHED.
1873 void usb_set_device_state(struct usb_device
*udev
,
1874 enum usb_device_state new_state
)
1876 unsigned long flags
;
1879 spin_lock_irqsave(&device_state_lock
, flags
);
1880 if (udev
->state
== USB_STATE_NOTATTACHED
)
1882 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1884 /* root hub wakeup capabilities are managed out-of-band
1885 * and may involve silicon errata ... ignore them here.
1888 if (udev
->state
== USB_STATE_SUSPENDED
1889 || new_state
== USB_STATE_SUSPENDED
)
1890 ; /* No change to wakeup settings */
1891 else if (new_state
== USB_STATE_CONFIGURED
)
1892 wakeup
= udev
->actconfig
->desc
.bmAttributes
1893 & USB_CONFIG_ATT_WAKEUP
;
1897 if (udev
->state
== USB_STATE_SUSPENDED
&&
1898 new_state
!= USB_STATE_SUSPENDED
)
1899 udev
->active_duration
-= jiffies
;
1900 else if (new_state
== USB_STATE_SUSPENDED
&&
1901 udev
->state
!= USB_STATE_SUSPENDED
)
1902 udev
->active_duration
+= jiffies
;
1903 udev
->state
= new_state
;
1905 recursively_mark_NOTATTACHED(udev
);
1906 spin_unlock_irqrestore(&device_state_lock
, flags
);
1908 device_set_wakeup_capable(&udev
->dev
, wakeup
);
1910 EXPORT_SYMBOL_GPL(usb_set_device_state
);
1913 * Choose a device number.
1915 * Device numbers are used as filenames in usbfs. On USB-1.1 and
1916 * USB-2.0 buses they are also used as device addresses, however on
1917 * USB-3.0 buses the address is assigned by the controller hardware
1918 * and it usually is not the same as the device number.
1920 * WUSB devices are simple: they have no hubs behind, so the mapping
1921 * device <-> virtual port number becomes 1:1. Why? to simplify the
1922 * life of the device connection logic in
1923 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1924 * handshake we need to assign a temporary address in the unauthorized
1925 * space. For simplicity we use the first virtual port number found to
1926 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1927 * and that becomes it's address [X < 128] or its unauthorized address
1930 * We add 1 as an offset to the one-based USB-stack port number
1931 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1932 * 0 is reserved by USB for default address; (b) Linux's USB stack
1933 * uses always #1 for the root hub of the controller. So USB stack's
1934 * port #1, which is wusb virtual-port #0 has address #2.
1936 * Devices connected under xHCI are not as simple. The host controller
1937 * supports virtualization, so the hardware assigns device addresses and
1938 * the HCD must setup data structures before issuing a set address
1939 * command to the hardware.
1941 static void choose_devnum(struct usb_device
*udev
)
1944 struct usb_bus
*bus
= udev
->bus
;
1946 /* If khubd ever becomes multithreaded, this will need a lock */
1948 devnum
= udev
->portnum
+ 1;
1949 BUG_ON(test_bit(devnum
, bus
->devmap
.devicemap
));
1951 /* Try to allocate the next devnum beginning at
1952 * bus->devnum_next. */
1953 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1956 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
,
1958 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1961 set_bit(devnum
, bus
->devmap
.devicemap
);
1962 udev
->devnum
= devnum
;
1966 static void release_devnum(struct usb_device
*udev
)
1968 if (udev
->devnum
> 0) {
1969 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1974 static void update_devnum(struct usb_device
*udev
, int devnum
)
1976 /* The address for a WUSB device is managed by wusbcore. */
1978 udev
->devnum
= devnum
;
1981 static void hub_free_dev(struct usb_device
*udev
)
1983 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
1985 /* Root hubs aren't real devices, so don't free HCD resources */
1986 if (hcd
->driver
->free_dev
&& udev
->parent
)
1987 hcd
->driver
->free_dev(hcd
, udev
);
1991 * usb_disconnect - disconnect a device (usbcore-internal)
1992 * @pdev: pointer to device being disconnected
1993 * Context: !in_interrupt ()
1995 * Something got disconnected. Get rid of it and all of its children.
1997 * If *pdev is a normal device then the parent hub must already be locked.
1998 * If *pdev is a root hub then this routine will acquire the
1999 * usb_bus_list_lock on behalf of the caller.
2001 * Only hub drivers (including virtual root hub drivers for host
2002 * controllers) should ever call this.
2004 * This call is synchronous, and may not be used in an interrupt context.
2006 void usb_disconnect(struct usb_device
**pdev
)
2008 struct usb_device
*udev
= *pdev
;
2009 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
2012 /* mark the device as inactive, so any further urb submissions for
2013 * this device (and any of its children) will fail immediately.
2014 * this quiesces everything except pending urbs.
2016 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
2017 dev_info(&udev
->dev
, "USB disconnect, device number %d\n",
2020 usb_lock_device(udev
);
2022 /* Free up all the children before we remove this device */
2023 for (i
= 0; i
< udev
->maxchild
; i
++) {
2024 if (hub
->ports
[i
]->child
)
2025 usb_disconnect(&hub
->ports
[i
]->child
);
2028 /* deallocate hcd/hardware state ... nuking all pending urbs and
2029 * cleaning up all state associated with the current configuration
2030 * so that the hardware is now fully quiesced.
2032 dev_dbg (&udev
->dev
, "unregistering device\n");
2033 usb_disable_device(udev
, 0);
2034 usb_hcd_synchronize_unlinks(udev
);
2037 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
2038 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
2040 sysfs_remove_link(&udev
->dev
.kobj
, "port");
2041 sysfs_remove_link(&port_dev
->dev
.kobj
, "device");
2043 if (!port_dev
->did_runtime_put
)
2044 pm_runtime_put(&port_dev
->dev
);
2046 port_dev
->did_runtime_put
= false;
2049 usb_remove_ep_devs(&udev
->ep0
);
2050 usb_unlock_device(udev
);
2052 /* Unregister the device. The device driver is responsible
2053 * for de-configuring the device and invoking the remove-device
2054 * notifier chain (used by usbfs and possibly others).
2056 device_del(&udev
->dev
);
2058 /* Free the device number and delete the parent's children[]
2059 * (or root_hub) pointer.
2061 release_devnum(udev
);
2063 /* Avoid races with recursively_mark_NOTATTACHED() */
2064 spin_lock_irq(&device_state_lock
);
2066 spin_unlock_irq(&device_state_lock
);
2070 put_device(&udev
->dev
);
2073 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
2074 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
2078 dev_info(&udev
->dev
, "%s: %s\n", id
, string
);
2081 static void announce_device(struct usb_device
*udev
)
2083 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
2084 le16_to_cpu(udev
->descriptor
.idVendor
),
2085 le16_to_cpu(udev
->descriptor
.idProduct
));
2086 dev_info(&udev
->dev
,
2087 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
2088 udev
->descriptor
.iManufacturer
,
2089 udev
->descriptor
.iProduct
,
2090 udev
->descriptor
.iSerialNumber
);
2091 show_string(udev
, "Product", udev
->product
);
2092 show_string(udev
, "Manufacturer", udev
->manufacturer
);
2093 show_string(udev
, "SerialNumber", udev
->serial
);
2096 static inline void announce_device(struct usb_device
*udev
) { }
2099 #ifdef CONFIG_USB_OTG
2100 #include "otg_whitelist.h"
2104 * usb_enumerate_device_otg - FIXME (usbcore-internal)
2105 * @udev: newly addressed device (in ADDRESS state)
2107 * Finish enumeration for On-The-Go devices
2109 static int usb_enumerate_device_otg(struct usb_device
*udev
)
2113 #ifdef CONFIG_USB_OTG
2115 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
2116 * to wake us after we've powered off VBUS; and HNP, switching roles
2117 * "host" to "peripheral". The OTG descriptor helps figure this out.
2119 if (!udev
->bus
->is_b_host
2121 && udev
->parent
== udev
->bus
->root_hub
) {
2122 struct usb_otg_descriptor
*desc
= NULL
;
2123 struct usb_bus
*bus
= udev
->bus
;
2125 /* descriptor may appear anywhere in config */
2126 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
2127 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
2128 USB_DT_OTG
, (void **) &desc
) == 0) {
2129 if (desc
->bmAttributes
& USB_OTG_HNP
) {
2130 unsigned port1
= udev
->portnum
;
2132 dev_info(&udev
->dev
,
2133 "Dual-Role OTG device on %sHNP port\n",
2134 (port1
== bus
->otg_port
)
2137 /* enable HNP before suspend, it's simpler */
2138 if (port1
== bus
->otg_port
)
2139 bus
->b_hnp_enable
= 1;
2140 err
= usb_control_msg(udev
,
2141 usb_sndctrlpipe(udev
, 0),
2142 USB_REQ_SET_FEATURE
, 0,
2144 ? USB_DEVICE_B_HNP_ENABLE
2145 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
2146 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2148 /* OTG MESSAGE: report errors here,
2149 * customize to match your product.
2151 dev_info(&udev
->dev
,
2152 "can't set HNP mode: %d\n",
2154 bus
->b_hnp_enable
= 0;
2160 if (!is_targeted(udev
)) {
2162 /* Maybe it can talk to us, though we can't talk to it.
2163 * (Includes HNP test device.)
2165 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
2166 err
= usb_port_suspend(udev
, PMSG_SUSPEND
);
2168 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
2180 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
2181 * @udev: newly addressed device (in ADDRESS state)
2183 * This is only called by usb_new_device() and usb_authorize_device()
2184 * and FIXME -- all comments that apply to them apply here wrt to
2187 * If the device is WUSB and not authorized, we don't attempt to read
2188 * the string descriptors, as they will be errored out by the device
2189 * until it has been authorized.
2191 static int usb_enumerate_device(struct usb_device
*udev
)
2195 if (udev
->config
== NULL
) {
2196 err
= usb_get_configuration(udev
);
2199 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
2204 if (udev
->wusb
== 1 && udev
->authorized
== 0) {
2205 udev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
2206 udev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
2207 udev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
2210 /* read the standard strings and cache them if present */
2211 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
2212 udev
->manufacturer
= usb_cache_string(udev
,
2213 udev
->descriptor
.iManufacturer
);
2214 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
2216 err
= usb_enumerate_device_otg(udev
);
2220 usb_detect_interface_quirks(udev
);
2225 static void set_usb_port_removable(struct usb_device
*udev
)
2227 struct usb_device
*hdev
= udev
->parent
;
2228 struct usb_hub
*hub
;
2229 u8 port
= udev
->portnum
;
2230 u16 wHubCharacteristics
;
2231 bool removable
= true;
2236 hub
= usb_hub_to_struct_hub(udev
->parent
);
2238 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2240 if (!(wHubCharacteristics
& HUB_CHAR_COMPOUND
))
2243 if (hub_is_superspeed(hdev
)) {
2244 if (le16_to_cpu(hub
->descriptor
->u
.ss
.DeviceRemovable
)
2248 if (hub
->descriptor
->u
.hs
.DeviceRemovable
[port
/ 8] & (1 << (port
% 8)))
2253 udev
->removable
= USB_DEVICE_REMOVABLE
;
2255 udev
->removable
= USB_DEVICE_FIXED
;
2259 * usb_new_device - perform initial device setup (usbcore-internal)
2260 * @udev: newly addressed device (in ADDRESS state)
2262 * This is called with devices which have been detected but not fully
2263 * enumerated. The device descriptor is available, but not descriptors
2264 * for any device configuration. The caller must have locked either
2265 * the parent hub (if udev is a normal device) or else the
2266 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
2267 * udev has already been installed, but udev is not yet visible through
2268 * sysfs or other filesystem code.
2270 * It will return if the device is configured properly or not. Zero if
2271 * the interface was registered with the driver core; else a negative
2274 * This call is synchronous, and may not be used in an interrupt context.
2276 * Only the hub driver or root-hub registrar should ever call this.
2278 int usb_new_device(struct usb_device
*udev
)
2283 /* Initialize non-root-hub device wakeup to disabled;
2284 * device (un)configuration controls wakeup capable
2285 * sysfs power/wakeup controls wakeup enabled/disabled
2287 device_init_wakeup(&udev
->dev
, 0);
2290 /* Tell the runtime-PM framework the device is active */
2291 pm_runtime_set_active(&udev
->dev
);
2292 pm_runtime_get_noresume(&udev
->dev
);
2293 pm_runtime_use_autosuspend(&udev
->dev
);
2294 pm_runtime_enable(&udev
->dev
);
2296 /* By default, forbid autosuspend for all devices. It will be
2297 * allowed for hubs during binding.
2299 usb_disable_autosuspend(udev
);
2301 err
= usb_enumerate_device(udev
); /* Read descriptors */
2304 dev_dbg(&udev
->dev
, "udev %d, busnum %d, minor = %d\n",
2305 udev
->devnum
, udev
->bus
->busnum
,
2306 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
2307 /* export the usbdev device-node for libusb */
2308 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
2309 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
2311 /* Tell the world! */
2312 announce_device(udev
);
2315 add_device_randomness(udev
->serial
, strlen(udev
->serial
));
2317 add_device_randomness(udev
->product
, strlen(udev
->product
));
2318 if (udev
->manufacturer
)
2319 add_device_randomness(udev
->manufacturer
,
2320 strlen(udev
->manufacturer
));
2322 device_enable_async_suspend(&udev
->dev
);
2325 * check whether the hub marks this port as non-removable. Do it
2326 * now so that platform-specific data can override it in
2330 set_usb_port_removable(udev
);
2332 /* Register the device. The device driver is responsible
2333 * for configuring the device and invoking the add-device
2334 * notifier chain (used by usbfs and possibly others).
2336 err
= device_add(&udev
->dev
);
2338 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
2342 /* Create link files between child device and usb port device. */
2344 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
2345 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
2347 err
= sysfs_create_link(&udev
->dev
.kobj
,
2348 &port_dev
->dev
.kobj
, "port");
2352 err
= sysfs_create_link(&port_dev
->dev
.kobj
,
2353 &udev
->dev
.kobj
, "device");
2355 sysfs_remove_link(&udev
->dev
.kobj
, "port");
2359 pm_runtime_get_sync(&port_dev
->dev
);
2362 (void) usb_create_ep_devs(&udev
->dev
, &udev
->ep0
, udev
);
2363 usb_mark_last_busy(udev
);
2364 pm_runtime_put_sync_autosuspend(&udev
->dev
);
2368 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
2369 pm_runtime_disable(&udev
->dev
);
2370 pm_runtime_set_suspended(&udev
->dev
);
2376 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
2377 * @usb_dev: USB device
2379 * Move the USB device to a very basic state where interfaces are disabled
2380 * and the device is in fact unconfigured and unusable.
2382 * We share a lock (that we have) with device_del(), so we need to
2385 int usb_deauthorize_device(struct usb_device
*usb_dev
)
2387 usb_lock_device(usb_dev
);
2388 if (usb_dev
->authorized
== 0)
2389 goto out_unauthorized
;
2391 usb_dev
->authorized
= 0;
2392 usb_set_configuration(usb_dev
, -1);
2394 kfree(usb_dev
->product
);
2395 usb_dev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
2396 kfree(usb_dev
->manufacturer
);
2397 usb_dev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
2398 kfree(usb_dev
->serial
);
2399 usb_dev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
2401 usb_destroy_configuration(usb_dev
);
2402 usb_dev
->descriptor
.bNumConfigurations
= 0;
2405 usb_unlock_device(usb_dev
);
2410 int usb_authorize_device(struct usb_device
*usb_dev
)
2414 usb_lock_device(usb_dev
);
2415 if (usb_dev
->authorized
== 1)
2416 goto out_authorized
;
2418 result
= usb_autoresume_device(usb_dev
);
2420 dev_err(&usb_dev
->dev
,
2421 "can't autoresume for authorization: %d\n", result
);
2422 goto error_autoresume
;
2424 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
2426 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
2427 "authorization: %d\n", result
);
2428 goto error_device_descriptor
;
2431 kfree(usb_dev
->product
);
2432 usb_dev
->product
= NULL
;
2433 kfree(usb_dev
->manufacturer
);
2434 usb_dev
->manufacturer
= NULL
;
2435 kfree(usb_dev
->serial
);
2436 usb_dev
->serial
= NULL
;
2438 usb_dev
->authorized
= 1;
2439 result
= usb_enumerate_device(usb_dev
);
2441 goto error_enumerate
;
2442 /* Choose and set the configuration. This registers the interfaces
2443 * with the driver core and lets interface drivers bind to them.
2445 c
= usb_choose_configuration(usb_dev
);
2447 result
= usb_set_configuration(usb_dev
, c
);
2449 dev_err(&usb_dev
->dev
,
2450 "can't set config #%d, error %d\n", c
, result
);
2451 /* This need not be fatal. The user can try to
2452 * set other configurations. */
2455 dev_info(&usb_dev
->dev
, "authorized to connect\n");
2458 error_device_descriptor
:
2459 usb_autosuspend_device(usb_dev
);
2462 usb_unlock_device(usb_dev
); // complements locktree
2467 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2468 static unsigned hub_is_wusb(struct usb_hub
*hub
)
2470 struct usb_hcd
*hcd
;
2471 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
2473 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
2474 return hcd
->wireless
;
2478 #define PORT_RESET_TRIES 5
2479 #define SET_ADDRESS_TRIES 2
2480 #define GET_DESCRIPTOR_TRIES 2
2481 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2482 #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first)
2484 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
2485 #define HUB_SHORT_RESET_TIME 10
2486 #define HUB_BH_RESET_TIME 50
2487 #define HUB_LONG_RESET_TIME 200
2488 #define HUB_RESET_TIMEOUT 800
2490 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
2491 struct usb_device
*udev
, unsigned int delay
, bool warm
);
2493 /* Is a USB 3.0 port in the Inactive or Complinance Mode state?
2494 * Port worm reset is required to recover
2496 static bool hub_port_warm_reset_required(struct usb_hub
*hub
, u16 portstatus
)
2498 return hub_is_superspeed(hub
->hdev
) &&
2499 (((portstatus
& USB_PORT_STAT_LINK_STATE
) ==
2500 USB_SS_PORT_LS_SS_INACTIVE
) ||
2501 ((portstatus
& USB_PORT_STAT_LINK_STATE
) ==
2502 USB_SS_PORT_LS_COMP_MOD
)) ;
2505 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
2506 struct usb_device
*udev
, unsigned int delay
, bool warm
)
2508 int delay_time
, ret
;
2512 for (delay_time
= 0;
2513 delay_time
< HUB_RESET_TIMEOUT
;
2514 delay_time
+= delay
) {
2515 /* wait to give the device a chance to reset */
2518 /* read and decode port status */
2519 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2523 /* The port state is unknown until the reset completes. */
2524 if (!(portstatus
& USB_PORT_STAT_RESET
))
2527 /* switch to the long delay after two short delay failures */
2528 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
2529 delay
= HUB_LONG_RESET_TIME
;
2531 dev_dbg (hub
->intfdev
,
2532 "port %d not %sreset yet, waiting %dms\n",
2533 port1
, warm
? "warm " : "", delay
);
2536 if ((portstatus
& USB_PORT_STAT_RESET
))
2539 if (hub_port_warm_reset_required(hub
, portstatus
))
2542 /* Device went away? */
2543 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
2546 /* bomb out completely if the connection bounced. A USB 3.0
2547 * connection may bounce if multiple warm resets were issued,
2548 * but the device may have successfully re-connected. Ignore it.
2550 if (!hub_is_superspeed(hub
->hdev
) &&
2551 (portchange
& USB_PORT_STAT_C_CONNECTION
))
2554 if (!(portstatus
& USB_PORT_STAT_ENABLE
))
2560 if (hub_is_wusb(hub
))
2561 udev
->speed
= USB_SPEED_WIRELESS
;
2562 else if (hub_is_superspeed(hub
->hdev
))
2563 udev
->speed
= USB_SPEED_SUPER
;
2564 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
2565 udev
->speed
= USB_SPEED_HIGH
;
2566 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
2567 udev
->speed
= USB_SPEED_LOW
;
2569 udev
->speed
= USB_SPEED_FULL
;
2573 static void hub_port_finish_reset(struct usb_hub
*hub
, int port1
,
2574 struct usb_device
*udev
, int *status
)
2578 /* TRSTRCY = 10 ms; plus some extra */
2581 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2583 update_devnum(udev
, 0);
2584 /* The xHC may think the device is already reset,
2585 * so ignore the status.
2587 if (hcd
->driver
->reset_device
)
2588 hcd
->driver
->reset_device(hcd
, udev
);
2593 usb_clear_port_feature(hub
->hdev
,
2594 port1
, USB_PORT_FEAT_C_RESET
);
2595 if (hub_is_superspeed(hub
->hdev
)) {
2596 usb_clear_port_feature(hub
->hdev
, port1
,
2597 USB_PORT_FEAT_C_BH_PORT_RESET
);
2598 usb_clear_port_feature(hub
->hdev
, port1
,
2599 USB_PORT_FEAT_C_PORT_LINK_STATE
);
2600 usb_clear_port_feature(hub
->hdev
, port1
,
2601 USB_PORT_FEAT_C_CONNECTION
);
2604 usb_set_device_state(udev
, *status
2605 ? USB_STATE_NOTATTACHED
2606 : USB_STATE_DEFAULT
);
2611 /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
2612 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
2613 struct usb_device
*udev
, unsigned int delay
, bool warm
)
2616 u16 portchange
, portstatus
;
2618 if (!hub_is_superspeed(hub
->hdev
)) {
2620 dev_err(hub
->intfdev
, "only USB3 hub support "
2624 /* Block EHCI CF initialization during the port reset.
2625 * Some companion controllers don't like it when they mix.
2627 down_read(&ehci_cf_port_reset_rwsem
);
2630 * If the caller hasn't explicitly requested a warm reset,
2631 * double check and see if one is needed.
2633 status
= hub_port_status(hub
, port1
,
2634 &portstatus
, &portchange
);
2638 if (hub_port_warm_reset_required(hub
, portstatus
))
2642 /* Reset the port */
2643 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
2644 status
= set_port_feature(hub
->hdev
, port1
, (warm
?
2645 USB_PORT_FEAT_BH_PORT_RESET
:
2646 USB_PORT_FEAT_RESET
));
2647 if (status
== -ENODEV
) {
2648 ; /* The hub is gone */
2649 } else if (status
) {
2650 dev_err(hub
->intfdev
,
2651 "cannot %sreset port %d (err = %d)\n",
2652 warm
? "warm " : "", port1
, status
);
2654 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
,
2656 if (status
&& status
!= -ENOTCONN
&& status
!= -ENODEV
)
2657 dev_dbg(hub
->intfdev
,
2658 "port_wait_reset: err = %d\n",
2662 /* Check for disconnect or reset */
2663 if (status
== 0 || status
== -ENOTCONN
|| status
== -ENODEV
) {
2664 hub_port_finish_reset(hub
, port1
, udev
, &status
);
2666 if (!hub_is_superspeed(hub
->hdev
))
2670 * If a USB 3.0 device migrates from reset to an error
2671 * state, re-issue the warm reset.
2673 if (hub_port_status(hub
, port1
,
2674 &portstatus
, &portchange
) < 0)
2677 if (!hub_port_warm_reset_required(hub
, portstatus
))
2681 * If the port is in SS.Inactive or Compliance Mode, the
2682 * hot or warm reset failed. Try another warm reset.
2685 dev_dbg(hub
->intfdev
, "hot reset failed, warm reset port %d\n",
2691 dev_dbg (hub
->intfdev
,
2692 "port %d not enabled, trying %sreset again...\n",
2693 port1
, warm
? "warm " : "");
2694 delay
= HUB_LONG_RESET_TIME
;
2697 dev_err (hub
->intfdev
,
2698 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2702 if (!hub_is_superspeed(hub
->hdev
))
2703 up_read(&ehci_cf_port_reset_rwsem
);
2708 /* Check if a port is power on */
2709 static int port_is_power_on(struct usb_hub
*hub
, unsigned portstatus
)
2713 if (hub_is_superspeed(hub
->hdev
)) {
2714 if (portstatus
& USB_SS_PORT_STAT_POWER
)
2717 if (portstatus
& USB_PORT_STAT_POWER
)
2726 /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
2727 static int port_is_suspended(struct usb_hub
*hub
, unsigned portstatus
)
2731 if (hub_is_superspeed(hub
->hdev
)) {
2732 if ((portstatus
& USB_PORT_STAT_LINK_STATE
)
2733 == USB_SS_PORT_LS_U3
)
2736 if (portstatus
& USB_PORT_STAT_SUSPEND
)
2743 /* Determine whether the device on a port is ready for a normal resume,
2744 * is ready for a reset-resume, or should be disconnected.
2746 static int check_port_resume_type(struct usb_device
*udev
,
2747 struct usb_hub
*hub
, int port1
,
2748 int status
, unsigned portchange
, unsigned portstatus
)
2750 /* Is the device still present? */
2751 if (status
|| port_is_suspended(hub
, portstatus
) ||
2752 !port_is_power_on(hub
, portstatus
) ||
2753 !(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2758 /* Can't do a normal resume if the port isn't enabled,
2759 * so try a reset-resume instead.
2761 else if (!(portstatus
& USB_PORT_STAT_ENABLE
) && !udev
->reset_resume
) {
2762 if (udev
->persist_enabled
)
2763 udev
->reset_resume
= 1;
2769 dev_dbg(hub
->intfdev
,
2770 "port %d status %04x.%04x after resume, %d\n",
2771 port1
, portchange
, portstatus
, status
);
2772 } else if (udev
->reset_resume
) {
2774 /* Late port handoff can set status-change bits */
2775 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
2776 usb_clear_port_feature(hub
->hdev
, port1
,
2777 USB_PORT_FEAT_C_CONNECTION
);
2778 if (portchange
& USB_PORT_STAT_C_ENABLE
)
2779 usb_clear_port_feature(hub
->hdev
, port1
,
2780 USB_PORT_FEAT_C_ENABLE
);
2786 int usb_disable_ltm(struct usb_device
*udev
)
2788 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2790 /* Check if the roothub and device supports LTM. */
2791 if (!usb_device_supports_ltm(hcd
->self
.root_hub
) ||
2792 !usb_device_supports_ltm(udev
))
2795 /* Clear Feature LTM Enable can only be sent if the device is
2798 if (!udev
->actconfig
)
2801 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2802 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
2803 USB_DEVICE_LTM_ENABLE
, 0, NULL
, 0,
2804 USB_CTRL_SET_TIMEOUT
);
2806 EXPORT_SYMBOL_GPL(usb_disable_ltm
);
2808 void usb_enable_ltm(struct usb_device
*udev
)
2810 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2812 /* Check if the roothub and device supports LTM. */
2813 if (!usb_device_supports_ltm(hcd
->self
.root_hub
) ||
2814 !usb_device_supports_ltm(udev
))
2817 /* Set Feature LTM Enable can only be sent if the device is
2820 if (!udev
->actconfig
)
2823 usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2824 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
2825 USB_DEVICE_LTM_ENABLE
, 0, NULL
, 0,
2826 USB_CTRL_SET_TIMEOUT
);
2828 EXPORT_SYMBOL_GPL(usb_enable_ltm
);
2832 * usb_disable_function_remotewakeup - disable usb3.0
2833 * device's function remote wakeup
2834 * @udev: target device
2836 * Assume there's only one function on the USB 3.0
2837 * device and disable remote wake for the first
2838 * interface. FIXME if the interface association
2839 * descriptor shows there's more than one function.
2841 static int usb_disable_function_remotewakeup(struct usb_device
*udev
)
2843 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2844 USB_REQ_CLEAR_FEATURE
, USB_RECIP_INTERFACE
,
2845 USB_INTRF_FUNC_SUSPEND
, 0, NULL
, 0,
2846 USB_CTRL_SET_TIMEOUT
);
2850 * usb_port_suspend - suspend a usb device's upstream port
2851 * @udev: device that's no longer in active use, not a root hub
2852 * Context: must be able to sleep; device not locked; pm locks held
2854 * Suspends a USB device that isn't in active use, conserving power.
2855 * Devices may wake out of a suspend, if anything important happens,
2856 * using the remote wakeup mechanism. They may also be taken out of
2857 * suspend by the host, using usb_port_resume(). It's also routine
2858 * to disconnect devices while they are suspended.
2860 * This only affects the USB hardware for a device; its interfaces
2861 * (and, for hubs, child devices) must already have been suspended.
2863 * Selective port suspend reduces power; most suspended devices draw
2864 * less than 500 uA. It's also used in OTG, along with remote wakeup.
2865 * All devices below the suspended port are also suspended.
2867 * Devices leave suspend state when the host wakes them up. Some devices
2868 * also support "remote wakeup", where the device can activate the USB
2869 * tree above them to deliver data, such as a keypress or packet. In
2870 * some cases, this wakes the USB host.
2872 * Suspending OTG devices may trigger HNP, if that's been enabled
2873 * between a pair of dual-role devices. That will change roles, such
2874 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2876 * Devices on USB hub ports have only one "suspend" state, corresponding
2877 * to ACPI D2, "may cause the device to lose some context".
2878 * State transitions include:
2880 * - suspend, resume ... when the VBUS power link stays live
2881 * - suspend, disconnect ... VBUS lost
2883 * Once VBUS drop breaks the circuit, the port it's using has to go through
2884 * normal re-enumeration procedures, starting with enabling VBUS power.
2885 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2886 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
2887 * timer, no SRP, no requests through sysfs.
2889 * If Runtime PM isn't enabled or used, non-SuperSpeed devices really get
2890 * suspended only when their bus goes into global suspend (i.e., the root
2891 * hub is suspended). Nevertheless, we change @udev->state to
2892 * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual
2893 * upstream port setting is stored in @udev->port_is_suspended.
2895 * Returns 0 on success, else negative errno.
2897 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
2899 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
2900 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
2901 enum pm_qos_flags_status pm_qos_stat
;
2902 int port1
= udev
->portnum
;
2904 bool really_suspend
= true;
2906 /* enable remote wakeup when appropriate; this lets the device
2907 * wake up the upstream hub (including maybe the root hub).
2909 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
2910 * we don't explicitly enable it here.
2912 if (udev
->do_remote_wakeup
) {
2913 if (!hub_is_superspeed(hub
->hdev
)) {
2914 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2915 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
2916 USB_DEVICE_REMOTE_WAKEUP
, 0,
2918 USB_CTRL_SET_TIMEOUT
);
2920 /* Assume there's only one function on the USB 3.0
2921 * device and enable remote wake for the first
2922 * interface. FIXME if the interface association
2923 * descriptor shows there's more than one function.
2925 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2926 USB_REQ_SET_FEATURE
,
2927 USB_RECIP_INTERFACE
,
2928 USB_INTRF_FUNC_SUSPEND
,
2929 USB_INTRF_FUNC_SUSPEND_RW
|
2930 USB_INTRF_FUNC_SUSPEND_LP
,
2932 USB_CTRL_SET_TIMEOUT
);
2935 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
2937 /* bail if autosuspend is requested */
2938 if (PMSG_IS_AUTO(msg
))
2943 /* disable USB2 hardware LPM */
2944 if (udev
->usb2_hw_lpm_enabled
== 1)
2945 usb_set_usb2_hardware_lpm(udev
, 0);
2947 if (usb_disable_ltm(udev
)) {
2948 dev_err(&udev
->dev
, "%s Failed to disable LTM before suspend\n.",
2952 if (usb_unlocked_disable_lpm(udev
)) {
2953 dev_err(&udev
->dev
, "%s Failed to disable LPM before suspend\n.",
2959 if (hub_is_superspeed(hub
->hdev
))
2960 status
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_U3
);
2961 else if (PMSG_IS_AUTO(msg
))
2962 status
= set_port_feature(hub
->hdev
, port1
,
2963 USB_PORT_FEAT_SUSPEND
);
2965 * For system suspend, we do not need to enable the suspend feature
2966 * on individual USB-2 ports. The devices will automatically go
2967 * into suspend a few ms after the root hub stops sending packets.
2968 * The USB 2.0 spec calls this "global suspend".
2971 really_suspend
= false;
2975 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
2977 /* paranoia: "should not happen" */
2978 if (udev
->do_remote_wakeup
) {
2979 if (!hub_is_superspeed(hub
->hdev
)) {
2980 (void) usb_control_msg(udev
,
2981 usb_sndctrlpipe(udev
, 0),
2982 USB_REQ_CLEAR_FEATURE
,
2984 USB_DEVICE_REMOTE_WAKEUP
, 0,
2986 USB_CTRL_SET_TIMEOUT
);
2988 (void) usb_disable_function_remotewakeup(udev
);
2992 /* Try to enable USB2 hardware LPM again */
2993 if (udev
->usb2_hw_lpm_capable
== 1)
2994 usb_set_usb2_hardware_lpm(udev
, 1);
2996 /* Try to enable USB3 LTM and LPM again */
2997 usb_enable_ltm(udev
);
2998 usb_unlocked_enable_lpm(udev
);
3000 /* System sleep transitions should never fail */
3001 if (!PMSG_IS_AUTO(msg
))
3004 /* device has up to 10 msec to fully suspend */
3005 dev_dbg(&udev
->dev
, "usb %ssuspend, wakeup %d\n",
3006 (PMSG_IS_AUTO(msg
) ? "auto-" : ""),
3007 udev
->do_remote_wakeup
);
3008 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
3009 if (really_suspend
) {
3010 udev
->port_is_suspended
= 1;
3016 * Check whether current status meets the requirement of
3017 * usb port power off mechanism
3019 pm_qos_stat
= dev_pm_qos_flags(&port_dev
->dev
,
3020 PM_QOS_FLAG_NO_POWER_OFF
);
3021 if (!udev
->do_remote_wakeup
3022 && pm_qos_stat
!= PM_QOS_FLAGS_ALL
3023 && udev
->persist_enabled
3025 pm_runtime_put_sync(&port_dev
->dev
);
3026 port_dev
->did_runtime_put
= true;
3029 usb_mark_last_busy(hub
->hdev
);
3034 * If the USB "suspend" state is in use (rather than "global suspend"),
3035 * many devices will be individually taken out of suspend state using
3036 * special "resume" signaling. This routine kicks in shortly after
3037 * hardware resume signaling is finished, either because of selective
3038 * resume (by host) or remote wakeup (by device) ... now see what changed
3039 * in the tree that's rooted at this device.
3041 * If @udev->reset_resume is set then the device is reset before the
3042 * status check is done.
3044 static int finish_port_resume(struct usb_device
*udev
)
3049 /* caller owns the udev device lock */
3050 dev_dbg(&udev
->dev
, "%s\n",
3051 udev
->reset_resume
? "finish reset-resume" : "finish resume");
3053 /* usb ch9 identifies four variants of SUSPENDED, based on what
3054 * state the device resumes to. Linux currently won't see the
3055 * first two on the host side; they'd be inside hub_port_init()
3056 * during many timeouts, but khubd can't suspend until later.
3058 usb_set_device_state(udev
, udev
->actconfig
3059 ? USB_STATE_CONFIGURED
3060 : USB_STATE_ADDRESS
);
3062 /* 10.5.4.5 says not to reset a suspended port if the attached
3063 * device is enabled for remote wakeup. Hence the reset
3064 * operation is carried out here, after the port has been
3067 if (udev
->reset_resume
)
3069 status
= usb_reset_and_verify_device(udev
);
3071 /* 10.5.4.5 says be sure devices in the tree are still there.
3072 * For now let's assume the device didn't go crazy on resume,
3073 * and device drivers will know about any resume quirks.
3077 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
3079 status
= (status
> 0 ? 0 : -ENODEV
);
3081 /* If a normal resume failed, try doing a reset-resume */
3082 if (status
&& !udev
->reset_resume
&& udev
->persist_enabled
) {
3083 dev_dbg(&udev
->dev
, "retry with reset-resume\n");
3084 udev
->reset_resume
= 1;
3085 goto retry_reset_resume
;
3090 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
3093 * There are a few quirky devices which violate the standard
3094 * by claiming to have remote wakeup enabled after a reset,
3095 * which crash if the feature is cleared, hence check for
3096 * udev->reset_resume
3098 } else if (udev
->actconfig
&& !udev
->reset_resume
) {
3099 if (!hub_is_superspeed(udev
->parent
)) {
3100 le16_to_cpus(&devstatus
);
3101 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
3102 status
= usb_control_msg(udev
,
3103 usb_sndctrlpipe(udev
, 0),
3104 USB_REQ_CLEAR_FEATURE
,
3106 USB_DEVICE_REMOTE_WAKEUP
, 0,
3108 USB_CTRL_SET_TIMEOUT
);
3110 status
= usb_get_status(udev
, USB_RECIP_INTERFACE
, 0,
3112 le16_to_cpus(&devstatus
);
3113 if (!status
&& devstatus
& (USB_INTRF_STAT_FUNC_RW_CAP
3114 | USB_INTRF_STAT_FUNC_RW
))
3116 usb_disable_function_remotewakeup(udev
);
3121 "disable remote wakeup, status %d\n",
3129 * usb_port_resume - re-activate a suspended usb device's upstream port
3130 * @udev: device to re-activate, not a root hub
3131 * Context: must be able to sleep; device not locked; pm locks held
3133 * This will re-activate the suspended device, increasing power usage
3134 * while letting drivers communicate again with its endpoints.
3135 * USB resume explicitly guarantees that the power session between
3136 * the host and the device is the same as it was when the device
3139 * If @udev->reset_resume is set then this routine won't check that the
3140 * port is still enabled. Furthermore, finish_port_resume() above will
3141 * reset @udev. The end result is that a broken power session can be
3142 * recovered and @udev will appear to persist across a loss of VBUS power.
3144 * For example, if a host controller doesn't maintain VBUS suspend current
3145 * during a system sleep or is reset when the system wakes up, all the USB
3146 * power sessions below it will be broken. This is especially troublesome
3147 * for mass-storage devices containing mounted filesystems, since the
3148 * device will appear to have disconnected and all the memory mappings
3149 * to it will be lost. Using the USB_PERSIST facility, the device can be
3150 * made to appear as if it had not disconnected.
3152 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
3153 * every effort to insure that the same device is present after the
3154 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
3155 * quite possible for a device to remain unaltered but its media to be
3156 * changed. If the user replaces a flash memory card while the system is
3157 * asleep, he will have only himself to blame when the filesystem on the
3158 * new card is corrupted and the system crashes.
3160 * Returns 0 on success, else negative errno.
3162 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
3164 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
3165 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
3166 int port1
= udev
->portnum
;
3168 u16 portchange
, portstatus
;
3170 if (port_dev
->did_runtime_put
) {
3171 status
= pm_runtime_get_sync(&port_dev
->dev
);
3172 port_dev
->did_runtime_put
= false;
3174 dev_dbg(&udev
->dev
, "can't resume usb port, status %d\n",
3180 /* Skip the initial Clear-Suspend step for a remote wakeup */
3181 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3182 if (status
== 0 && !port_is_suspended(hub
, portstatus
))
3183 goto SuspendCleared
;
3185 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
3187 set_bit(port1
, hub
->busy_bits
);
3189 /* see 7.1.7.7; affects power usage, but not budgeting */
3190 if (hub_is_superspeed(hub
->hdev
))
3191 status
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_U0
);
3193 status
= usb_clear_port_feature(hub
->hdev
,
3194 port1
, USB_PORT_FEAT_SUSPEND
);
3196 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
3199 /* drive resume for at least 20 msec */
3200 dev_dbg(&udev
->dev
, "usb %sresume\n",
3201 (PMSG_IS_AUTO(msg
) ? "auto-" : ""));
3204 /* Virtual root hubs can trigger on GET_PORT_STATUS to
3205 * stop resume signaling. Then finish the resume
3208 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3210 /* TRSMRCY = 10 msec */
3216 udev
->port_is_suspended
= 0;
3217 if (hub_is_superspeed(hub
->hdev
)) {
3218 if (portchange
& USB_PORT_STAT_C_LINK_STATE
)
3219 usb_clear_port_feature(hub
->hdev
, port1
,
3220 USB_PORT_FEAT_C_PORT_LINK_STATE
);
3222 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
3223 usb_clear_port_feature(hub
->hdev
, port1
,
3224 USB_PORT_FEAT_C_SUSPEND
);
3228 clear_bit(port1
, hub
->busy_bits
);
3230 status
= check_port_resume_type(udev
,
3231 hub
, port1
, status
, portchange
, portstatus
);
3233 status
= finish_port_resume(udev
);
3235 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
3236 hub_port_logical_disconnect(hub
, port1
);
3238 /* Try to enable USB2 hardware LPM */
3239 if (udev
->usb2_hw_lpm_capable
== 1)
3240 usb_set_usb2_hardware_lpm(udev
, 1);
3242 /* Try to enable USB3 LTM and LPM */
3243 usb_enable_ltm(udev
);
3244 usb_unlocked_enable_lpm(udev
);
3250 #endif /* CONFIG_PM */
3252 #ifdef CONFIG_PM_RUNTIME
3254 /* caller has locked udev */
3255 int usb_remote_wakeup(struct usb_device
*udev
)
3259 if (udev
->state
== USB_STATE_SUSPENDED
) {
3260 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
3261 status
= usb_autoresume_device(udev
);
3263 /* Let the drivers do their thing, then... */
3264 usb_autosuspend_device(udev
);
3272 static int check_ports_changed(struct usb_hub
*hub
)
3276 for (port1
= 1; port1
<= hub
->hdev
->maxchild
; ++port1
) {
3277 u16 portstatus
, portchange
;
3280 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3281 if (!status
&& portchange
)
3287 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
3289 struct usb_hub
*hub
= usb_get_intfdata (intf
);
3290 struct usb_device
*hdev
= hub
->hdev
;
3294 /* Warn if children aren't already suspended */
3295 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
3296 struct usb_device
*udev
;
3298 udev
= hub
->ports
[port1
- 1]->child
;
3299 if (udev
&& udev
->can_submit
) {
3300 dev_warn(&intf
->dev
, "port %d nyet suspended\n", port1
);
3301 if (PMSG_IS_AUTO(msg
))
3306 if (hdev
->do_remote_wakeup
&& hub
->quirk_check_port_auto_suspend
) {
3307 /* check if there are changes pending on hub ports */
3308 if (check_ports_changed(hub
)) {
3309 if (PMSG_IS_AUTO(msg
))
3311 pm_wakeup_event(&hdev
->dev
, 2000);
3315 if (hub_is_superspeed(hdev
) && hdev
->do_remote_wakeup
) {
3316 /* Enable hub to send remote wakeup for all ports. */
3317 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
3318 status
= set_port_feature(hdev
,
3320 USB_PORT_FEAT_REMOTE_WAKE_CONNECT
|
3321 USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT
|
3322 USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT
,
3323 USB_PORT_FEAT_REMOTE_WAKE_MASK
);
3327 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3329 /* stop khubd and related activity */
3330 hub_quiesce(hub
, HUB_SUSPEND
);
3334 static int hub_resume(struct usb_interface
*intf
)
3336 struct usb_hub
*hub
= usb_get_intfdata(intf
);
3338 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3339 hub_activate(hub
, HUB_RESUME
);
3343 static int hub_reset_resume(struct usb_interface
*intf
)
3345 struct usb_hub
*hub
= usb_get_intfdata(intf
);
3347 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3348 hub_activate(hub
, HUB_RESET_RESUME
);
3353 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
3354 * @rhdev: struct usb_device for the root hub
3356 * The USB host controller driver calls this function when its root hub
3357 * is resumed and Vbus power has been interrupted or the controller
3358 * has been reset. The routine marks @rhdev as having lost power.
3359 * When the hub driver is resumed it will take notice and carry out
3360 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
3361 * the others will be disconnected.
3363 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
3365 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
3366 rhdev
->reset_resume
= 1;
3368 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
3370 static const char * const usb3_lpm_names
[] = {
3378 * Send a Set SEL control transfer to the device, prior to enabling
3379 * device-initiated U1 or U2. This lets the device know the exit latencies from
3380 * the time the device initiates a U1 or U2 exit, to the time it will receive a
3381 * packet from the host.
3383 * This function will fail if the SEL or PEL values for udev are greater than
3384 * the maximum allowed values for the link state to be enabled.
3386 static int usb_req_set_sel(struct usb_device
*udev
, enum usb3_link_state state
)
3388 struct usb_set_sel_req
*sel_values
;
3389 unsigned long long u1_sel
;
3390 unsigned long long u1_pel
;
3391 unsigned long long u2_sel
;
3392 unsigned long long u2_pel
;
3395 /* Convert SEL and PEL stored in ns to us */
3396 u1_sel
= DIV_ROUND_UP(udev
->u1_params
.sel
, 1000);
3397 u1_pel
= DIV_ROUND_UP(udev
->u1_params
.pel
, 1000);
3398 u2_sel
= DIV_ROUND_UP(udev
->u2_params
.sel
, 1000);
3399 u2_pel
= DIV_ROUND_UP(udev
->u2_params
.pel
, 1000);
3402 * Make sure that the calculated SEL and PEL values for the link
3403 * state we're enabling aren't bigger than the max SEL/PEL
3404 * value that will fit in the SET SEL control transfer.
3405 * Otherwise the device would get an incorrect idea of the exit
3406 * latency for the link state, and could start a device-initiated
3407 * U1/U2 when the exit latencies are too high.
3409 if ((state
== USB3_LPM_U1
&&
3410 (u1_sel
> USB3_LPM_MAX_U1_SEL_PEL
||
3411 u1_pel
> USB3_LPM_MAX_U1_SEL_PEL
)) ||
3412 (state
== USB3_LPM_U2
&&
3413 (u2_sel
> USB3_LPM_MAX_U2_SEL_PEL
||
3414 u2_pel
> USB3_LPM_MAX_U2_SEL_PEL
))) {
3415 dev_dbg(&udev
->dev
, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n",
3416 usb3_lpm_names
[state
], u1_sel
, u1_pel
);
3421 * If we're enabling device-initiated LPM for one link state,
3422 * but the other link state has a too high SEL or PEL value,
3423 * just set those values to the max in the Set SEL request.
3425 if (u1_sel
> USB3_LPM_MAX_U1_SEL_PEL
)
3426 u1_sel
= USB3_LPM_MAX_U1_SEL_PEL
;
3428 if (u1_pel
> USB3_LPM_MAX_U1_SEL_PEL
)
3429 u1_pel
= USB3_LPM_MAX_U1_SEL_PEL
;
3431 if (u2_sel
> USB3_LPM_MAX_U2_SEL_PEL
)
3432 u2_sel
= USB3_LPM_MAX_U2_SEL_PEL
;
3434 if (u2_pel
> USB3_LPM_MAX_U2_SEL_PEL
)
3435 u2_pel
= USB3_LPM_MAX_U2_SEL_PEL
;
3438 * usb_enable_lpm() can be called as part of a failed device reset,
3439 * which may be initiated by an error path of a mass storage driver.
3440 * Therefore, use GFP_NOIO.
3442 sel_values
= kmalloc(sizeof *(sel_values
), GFP_NOIO
);
3446 sel_values
->u1_sel
= u1_sel
;
3447 sel_values
->u1_pel
= u1_pel
;
3448 sel_values
->u2_sel
= cpu_to_le16(u2_sel
);
3449 sel_values
->u2_pel
= cpu_to_le16(u2_pel
);
3451 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3455 sel_values
, sizeof *(sel_values
),
3456 USB_CTRL_SET_TIMEOUT
);
3462 * Enable or disable device-initiated U1 or U2 transitions.
3464 static int usb_set_device_initiated_lpm(struct usb_device
*udev
,
3465 enum usb3_link_state state
, bool enable
)
3472 feature
= USB_DEVICE_U1_ENABLE
;
3475 feature
= USB_DEVICE_U2_ENABLE
;
3478 dev_warn(&udev
->dev
, "%s: Can't %s non-U1 or U2 state.\n",
3479 __func__
, enable
? "enable" : "disable");
3483 if (udev
->state
!= USB_STATE_CONFIGURED
) {
3484 dev_dbg(&udev
->dev
, "%s: Can't %s %s state "
3485 "for unconfigured device.\n",
3486 __func__
, enable
? "enable" : "disable",
3487 usb3_lpm_names
[state
]);
3493 * Now send the control transfer to enable device-initiated LPM
3494 * for either U1 or U2.
3496 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3497 USB_REQ_SET_FEATURE
,
3501 USB_CTRL_SET_TIMEOUT
);
3503 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3504 USB_REQ_CLEAR_FEATURE
,
3508 USB_CTRL_SET_TIMEOUT
);
3511 dev_warn(&udev
->dev
, "%s of device-initiated %s failed.\n",
3512 enable
? "Enable" : "Disable",
3513 usb3_lpm_names
[state
]);
3519 static int usb_set_lpm_timeout(struct usb_device
*udev
,
3520 enum usb3_link_state state
, int timeout
)
3527 feature
= USB_PORT_FEAT_U1_TIMEOUT
;
3530 feature
= USB_PORT_FEAT_U2_TIMEOUT
;
3533 dev_warn(&udev
->dev
, "%s: Can't set timeout for non-U1 or U2 state.\n",
3538 if (state
== USB3_LPM_U1
&& timeout
> USB3_LPM_U1_MAX_TIMEOUT
&&
3539 timeout
!= USB3_LPM_DEVICE_INITIATED
) {
3540 dev_warn(&udev
->dev
, "Failed to set %s timeout to 0x%x, "
3541 "which is a reserved value.\n",
3542 usb3_lpm_names
[state
], timeout
);
3546 ret
= set_port_feature(udev
->parent
,
3547 USB_PORT_LPM_TIMEOUT(timeout
) | udev
->portnum
,
3550 dev_warn(&udev
->dev
, "Failed to set %s timeout to 0x%x,"
3551 "error code %i\n", usb3_lpm_names
[state
],
3555 if (state
== USB3_LPM_U1
)
3556 udev
->u1_params
.timeout
= timeout
;
3558 udev
->u2_params
.timeout
= timeout
;
3563 * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
3566 * We will attempt to enable U1 or U2, but there are no guarantees that the
3567 * control transfers to set the hub timeout or enable device-initiated U1/U2
3568 * will be successful.
3570 * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
3571 * driver know about it. If that call fails, it should be harmless, and just
3572 * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
3574 static void usb_enable_link_state(struct usb_hcd
*hcd
, struct usb_device
*udev
,
3575 enum usb3_link_state state
)
3578 __u8 u1_mel
= udev
->bos
->ss_cap
->bU1devExitLat
;
3579 __le16 u2_mel
= udev
->bos
->ss_cap
->bU2DevExitLat
;
3581 /* If the device says it doesn't have *any* exit latency to come out of
3582 * U1 or U2, it's probably lying. Assume it doesn't implement that link
3585 if ((state
== USB3_LPM_U1
&& u1_mel
== 0) ||
3586 (state
== USB3_LPM_U2
&& u2_mel
== 0))
3590 * First, let the device know about the exit latencies
3591 * associated with the link state we're about to enable.
3593 ret
= usb_req_set_sel(udev
, state
);
3595 dev_warn(&udev
->dev
, "Set SEL for device-initiated %s failed.\n",
3596 usb3_lpm_names
[state
]);
3600 /* We allow the host controller to set the U1/U2 timeout internally
3601 * first, so that it can change its schedule to account for the
3602 * additional latency to send data to a device in a lower power
3605 timeout
= hcd
->driver
->enable_usb3_lpm_timeout(hcd
, udev
, state
);
3607 /* xHCI host controller doesn't want to enable this LPM state. */
3612 dev_warn(&udev
->dev
, "Could not enable %s link state, "
3613 "xHCI error %i.\n", usb3_lpm_names
[state
],
3618 if (usb_set_lpm_timeout(udev
, state
, timeout
))
3619 /* If we can't set the parent hub U1/U2 timeout,
3620 * device-initiated LPM won't be allowed either, so let the xHCI
3621 * host know that this link state won't be enabled.
3623 hcd
->driver
->disable_usb3_lpm_timeout(hcd
, udev
, state
);
3625 /* Only a configured device will accept the Set Feature U1/U2_ENABLE */
3626 else if (udev
->actconfig
)
3627 usb_set_device_initiated_lpm(udev
, state
, true);
3632 * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
3635 * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
3636 * If zero is returned, the parent will not allow the link to go into U1/U2.
3638 * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
3639 * it won't have an effect on the bus link state because the parent hub will
3640 * still disallow device-initiated U1/U2 entry.
3642 * If zero is returned, the xHCI host controller may still think U1/U2 entry is
3643 * possible. The result will be slightly more bus bandwidth will be taken up
3644 * (to account for U1/U2 exit latency), but it should be harmless.
3646 static int usb_disable_link_state(struct usb_hcd
*hcd
, struct usb_device
*udev
,
3647 enum usb3_link_state state
)
3653 feature
= USB_PORT_FEAT_U1_TIMEOUT
;
3656 feature
= USB_PORT_FEAT_U2_TIMEOUT
;
3659 dev_warn(&udev
->dev
, "%s: Can't disable non-U1 or U2 state.\n",
3664 if (usb_set_lpm_timeout(udev
, state
, 0))
3667 usb_set_device_initiated_lpm(udev
, state
, false);
3669 if (hcd
->driver
->disable_usb3_lpm_timeout(hcd
, udev
, state
))
3670 dev_warn(&udev
->dev
, "Could not disable xHCI %s timeout, "
3671 "bus schedule bandwidth may be impacted.\n",
3672 usb3_lpm_names
[state
]);
3677 * Disable hub-initiated and device-initiated U1 and U2 entry.
3678 * Caller must own the bandwidth_mutex.
3680 * This will call usb_enable_lpm() on failure, which will decrement
3681 * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
3683 int usb_disable_lpm(struct usb_device
*udev
)
3685 struct usb_hcd
*hcd
;
3687 if (!udev
|| !udev
->parent
||
3688 udev
->speed
!= USB_SPEED_SUPER
||
3692 hcd
= bus_to_hcd(udev
->bus
);
3693 if (!hcd
|| !hcd
->driver
->disable_usb3_lpm_timeout
)
3696 udev
->lpm_disable_count
++;
3697 if ((udev
->u1_params
.timeout
== 0 && udev
->u2_params
.timeout
== 0))
3700 /* If LPM is enabled, attempt to disable it. */
3701 if (usb_disable_link_state(hcd
, udev
, USB3_LPM_U1
))
3703 if (usb_disable_link_state(hcd
, udev
, USB3_LPM_U2
))
3709 usb_enable_lpm(udev
);
3712 EXPORT_SYMBOL_GPL(usb_disable_lpm
);
3714 /* Grab the bandwidth_mutex before calling usb_disable_lpm() */
3715 int usb_unlocked_disable_lpm(struct usb_device
*udev
)
3717 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3723 mutex_lock(hcd
->bandwidth_mutex
);
3724 ret
= usb_disable_lpm(udev
);
3725 mutex_unlock(hcd
->bandwidth_mutex
);
3729 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm
);
3732 * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
3733 * xHCI host policy may prevent U1 or U2 from being enabled.
3735 * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
3736 * until the lpm_disable_count drops to zero. Caller must own the
3739 void usb_enable_lpm(struct usb_device
*udev
)
3741 struct usb_hcd
*hcd
;
3743 if (!udev
|| !udev
->parent
||
3744 udev
->speed
!= USB_SPEED_SUPER
||
3748 udev
->lpm_disable_count
--;
3749 hcd
= bus_to_hcd(udev
->bus
);
3750 /* Double check that we can both enable and disable LPM.
3751 * Device must be configured to accept set feature U1/U2 timeout.
3753 if (!hcd
|| !hcd
->driver
->enable_usb3_lpm_timeout
||
3754 !hcd
->driver
->disable_usb3_lpm_timeout
)
3757 if (udev
->lpm_disable_count
> 0)
3760 usb_enable_link_state(hcd
, udev
, USB3_LPM_U1
);
3761 usb_enable_link_state(hcd
, udev
, USB3_LPM_U2
);
3763 EXPORT_SYMBOL_GPL(usb_enable_lpm
);
3765 /* Grab the bandwidth_mutex before calling usb_enable_lpm() */
3766 void usb_unlocked_enable_lpm(struct usb_device
*udev
)
3768 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3773 mutex_lock(hcd
->bandwidth_mutex
);
3774 usb_enable_lpm(udev
);
3775 mutex_unlock(hcd
->bandwidth_mutex
);
3777 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm
);
3780 #else /* CONFIG_PM */
3782 #define hub_suspend NULL
3783 #define hub_resume NULL
3784 #define hub_reset_resume NULL
3786 int usb_disable_lpm(struct usb_device
*udev
)
3790 EXPORT_SYMBOL_GPL(usb_disable_lpm
);
3792 void usb_enable_lpm(struct usb_device
*udev
) { }
3793 EXPORT_SYMBOL_GPL(usb_enable_lpm
);
3795 int usb_unlocked_disable_lpm(struct usb_device
*udev
)
3799 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm
);
3801 void usb_unlocked_enable_lpm(struct usb_device
*udev
) { }
3802 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm
);
3804 int usb_disable_ltm(struct usb_device
*udev
)
3808 EXPORT_SYMBOL_GPL(usb_disable_ltm
);
3810 void usb_enable_ltm(struct usb_device
*udev
) { }
3811 EXPORT_SYMBOL_GPL(usb_enable_ltm
);
3815 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
3817 * Between connect detection and reset signaling there must be a delay
3818 * of 100ms at least for debounce and power-settling. The corresponding
3819 * timer shall restart whenever the downstream port detects a disconnect.
3821 * Apparently there are some bluetooth and irda-dongles and a number of
3822 * low-speed devices for which this debounce period may last over a second.
3823 * Not covered by the spec - but easy to deal with.
3825 * This implementation uses a 1500ms total debounce timeout; if the
3826 * connection isn't stable by then it returns -ETIMEDOUT. It checks
3827 * every 25ms for transient disconnects. When the port status has been
3828 * unchanged for 100ms it returns the port status.
3830 int hub_port_debounce(struct usb_hub
*hub
, int port1
, bool must_be_connected
)
3833 int total_time
, stable_time
= 0;
3834 u16 portchange
, portstatus
;
3835 unsigned connection
= 0xffff;
3837 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
3838 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3842 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
3843 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
3844 if (!must_be_connected
||
3845 (connection
== USB_PORT_STAT_CONNECTION
))
3846 stable_time
+= HUB_DEBOUNCE_STEP
;
3847 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
3851 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
3854 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
3855 usb_clear_port_feature(hub
->hdev
, port1
,
3856 USB_PORT_FEAT_C_CONNECTION
);
3859 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
3861 msleep(HUB_DEBOUNCE_STEP
);
3864 dev_dbg (hub
->intfdev
,
3865 "debounce: port %d: total %dms stable %dms status 0x%x\n",
3866 port1
, total_time
, stable_time
, portstatus
);
3868 if (stable_time
< HUB_DEBOUNCE_STABLE
)
3873 void usb_ep0_reinit(struct usb_device
*udev
)
3875 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
, true);
3876 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
, true);
3877 usb_enable_endpoint(udev
, &udev
->ep0
, true);
3879 EXPORT_SYMBOL_GPL(usb_ep0_reinit
);
3881 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
3882 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
3884 static int hub_set_address(struct usb_device
*udev
, int devnum
)
3887 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3890 * The host controller will choose the device address,
3891 * instead of the core having chosen it earlier
3893 if (!hcd
->driver
->address_device
&& devnum
<= 1)
3895 if (udev
->state
== USB_STATE_ADDRESS
)
3897 if (udev
->state
!= USB_STATE_DEFAULT
)
3899 if (hcd
->driver
->address_device
)
3900 retval
= hcd
->driver
->address_device(hcd
, udev
);
3902 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
3903 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
3904 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3906 update_devnum(udev
, devnum
);
3907 /* Device now using proper address. */
3908 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
3909 usb_ep0_reinit(udev
);
3914 /* Reset device, (re)assign address, get device descriptor.
3915 * Device connection must be stable, no more debouncing needed.
3916 * Returns device in USB_STATE_ADDRESS, except on error.
3918 * If this is called for an already-existing device (as part of
3919 * usb_reset_and_verify_device), the caller must own the device lock. For a
3920 * newly detected device that is not accessible through any global
3921 * pointers, it's not necessary to lock the device.
3924 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
3927 static DEFINE_MUTEX(usb_address0_mutex
);
3929 struct usb_device
*hdev
= hub
->hdev
;
3930 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
3932 unsigned delay
= HUB_SHORT_RESET_TIME
;
3933 enum usb_device_speed oldspeed
= udev
->speed
;
3935 int devnum
= udev
->devnum
;
3937 /* root hub ports have a slightly longer reset period
3938 * (from USB 2.0 spec, section 7.1.7.5)
3940 if (!hdev
->parent
) {
3941 delay
= HUB_ROOT_RESET_TIME
;
3942 if (port1
== hdev
->bus
->otg_port
)
3943 hdev
->bus
->b_hnp_enable
= 0;
3946 /* Some low speed devices have problems with the quick delay, so */
3947 /* be a bit pessimistic with those devices. RHbug #23670 */
3948 if (oldspeed
== USB_SPEED_LOW
)
3949 delay
= HUB_LONG_RESET_TIME
;
3951 mutex_lock(&usb_address0_mutex
);
3953 /* Reset the device; full speed may morph to high speed */
3954 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
3955 retval
= hub_port_reset(hub
, port1
, udev
, delay
, false);
3956 if (retval
< 0) /* error or disconnect */
3958 /* success, speed is known */
3962 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
3963 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
3966 oldspeed
= udev
->speed
;
3968 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
3969 * it's fixed size except for full speed devices.
3970 * For Wireless USB devices, ep0 max packet is always 512 (tho
3971 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
3973 switch (udev
->speed
) {
3974 case USB_SPEED_SUPER
:
3975 case USB_SPEED_WIRELESS
: /* fixed at 512 */
3976 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(512);
3978 case USB_SPEED_HIGH
: /* fixed at 64 */
3979 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
3981 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
3982 /* to determine the ep0 maxpacket size, try to read
3983 * the device descriptor to get bMaxPacketSize0 and
3984 * then correct our initial guess.
3986 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
3988 case USB_SPEED_LOW
: /* fixed at 8 */
3989 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(8);
3995 if (udev
->speed
== USB_SPEED_WIRELESS
)
3996 speed
= "variable speed Wireless";
3998 speed
= usb_speed_string(udev
->speed
);
4000 if (udev
->speed
!= USB_SPEED_SUPER
)
4001 dev_info(&udev
->dev
,
4002 "%s %s USB device number %d using %s\n",
4003 (udev
->config
) ? "reset" : "new", speed
,
4004 devnum
, udev
->bus
->controller
->driver
->name
);
4006 /* Set up TT records, if needed */
4008 udev
->tt
= hdev
->tt
;
4009 udev
->ttport
= hdev
->ttport
;
4010 } else if (udev
->speed
!= USB_SPEED_HIGH
4011 && hdev
->speed
== USB_SPEED_HIGH
) {
4013 dev_err(&udev
->dev
, "parent hub has no TT\n");
4017 udev
->tt
= &hub
->tt
;
4018 udev
->ttport
= port1
;
4021 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
4022 * Because device hardware and firmware is sometimes buggy in
4023 * this area, and this is how Linux has done it for ages.
4024 * Change it cautiously.
4026 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
4027 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
4028 * so it may help with some non-standards-compliant devices.
4029 * Otherwise we start with SET_ADDRESS and then try to read the
4030 * first 8 bytes of the device descriptor to get the ep0 maxpacket
4033 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
4034 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
)) {
4035 struct usb_device_descriptor
*buf
;
4038 #define GET_DESCRIPTOR_BUFSIZE 64
4039 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
4045 /* Retry on all errors; some devices are flakey.
4046 * 255 is for WUSB devices, we actually need to use
4047 * 512 (WUSB1.0[4.8.1]).
4049 for (j
= 0; j
< 3; ++j
) {
4050 buf
->bMaxPacketSize0
= 0;
4051 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
4052 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
4053 USB_DT_DEVICE
<< 8, 0,
4054 buf
, GET_DESCRIPTOR_BUFSIZE
,
4055 initial_descriptor_timeout
);
4056 switch (buf
->bMaxPacketSize0
) {
4057 case 8: case 16: case 32: case 64: case 255:
4058 if (buf
->bDescriptorType
==
4072 udev
->descriptor
.bMaxPacketSize0
=
4073 buf
->bMaxPacketSize0
;
4076 retval
= hub_port_reset(hub
, port1
, udev
, delay
, false);
4077 if (retval
< 0) /* error or disconnect */
4079 if (oldspeed
!= udev
->speed
) {
4081 "device reset changed speed!\n");
4087 dev_err(&udev
->dev
, "device descriptor read/64, error %d\n",
4092 #undef GET_DESCRIPTOR_BUFSIZE
4096 * If device is WUSB, we already assigned an
4097 * unauthorized address in the Connect Ack sequence;
4098 * authorization will assign the final address.
4100 if (udev
->wusb
== 0) {
4101 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
4102 retval
= hub_set_address(udev
, devnum
);
4108 if (retval
!= -ENODEV
)
4109 dev_err(&udev
->dev
, "device not accepting address %d, error %d\n",
4113 if (udev
->speed
== USB_SPEED_SUPER
) {
4114 devnum
= udev
->devnum
;
4115 dev_info(&udev
->dev
,
4116 "%s SuperSpeed USB device number %d using %s\n",
4117 (udev
->config
) ? "reset" : "new",
4118 devnum
, udev
->bus
->controller
->driver
->name
);
4121 /* cope with hardware quirkiness:
4122 * - let SET_ADDRESS settle, some device hardware wants it
4123 * - read ep0 maxpacket even for high and low speed,
4126 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
))
4130 retval
= usb_get_device_descriptor(udev
, 8);
4132 if (retval
!= -ENODEV
)
4134 "device descriptor read/8, error %d\n",
4146 if (hcd
->phy
&& !hdev
->parent
)
4147 usb_phy_notify_connect(hcd
->phy
, udev
->speed
);
4150 * Some superspeed devices have finished the link training process
4151 * and attached to a superspeed hub port, but the device descriptor
4152 * got from those devices show they aren't superspeed devices. Warm
4153 * reset the port attached by the devices can fix them.
4155 if ((udev
->speed
== USB_SPEED_SUPER
) &&
4156 (le16_to_cpu(udev
->descriptor
.bcdUSB
) < 0x0300)) {
4157 dev_err(&udev
->dev
, "got a wrong device descriptor, "
4158 "warm reset device\n");
4159 hub_port_reset(hub
, port1
, udev
,
4160 HUB_BH_RESET_TIME
, true);
4165 if (udev
->descriptor
.bMaxPacketSize0
== 0xff ||
4166 udev
->speed
== USB_SPEED_SUPER
)
4169 i
= udev
->descriptor
.bMaxPacketSize0
;
4170 if (usb_endpoint_maxp(&udev
->ep0
.desc
) != i
) {
4171 if (udev
->speed
== USB_SPEED_LOW
||
4172 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
4173 dev_err(&udev
->dev
, "Invalid ep0 maxpacket: %d\n", i
);
4177 if (udev
->speed
== USB_SPEED_FULL
)
4178 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
4180 dev_warn(&udev
->dev
, "Using ep0 maxpacket: %d\n", i
);
4181 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
4182 usb_ep0_reinit(udev
);
4185 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
4186 if (retval
< (signed)sizeof(udev
->descriptor
)) {
4187 if (retval
!= -ENODEV
)
4188 dev_err(&udev
->dev
, "device descriptor read/all, error %d\n",
4195 if (udev
->wusb
== 0 && le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0201) {
4196 retval
= usb_get_bos_descriptor(udev
);
4198 udev
->lpm_capable
= usb_device_supports_lpm(udev
);
4199 usb_set_lpm_parameters(udev
);
4204 /* notify HCD that we have a device connected and addressed */
4205 if (hcd
->driver
->update_device
)
4206 hcd
->driver
->update_device(hcd
, udev
);
4209 hub_port_disable(hub
, port1
, 0);
4210 update_devnum(udev
, devnum
); /* for disconnect processing */
4212 mutex_unlock(&usb_address0_mutex
);
4217 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
4219 struct usb_qualifier_descriptor
*qual
;
4222 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
4226 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
4227 qual
, sizeof *qual
);
4228 if (status
== sizeof *qual
) {
4229 dev_info(&udev
->dev
, "not running at top speed; "
4230 "connect to a high speed hub\n");
4231 /* hub LEDs are probably harder to miss than syslog */
4232 if (hub
->has_indicators
) {
4233 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
4234 schedule_delayed_work (&hub
->leds
, 0);
4241 hub_power_remaining (struct usb_hub
*hub
)
4243 struct usb_device
*hdev
= hub
->hdev
;
4247 if (!hub
->limited_power
)
4250 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
4251 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
4252 struct usb_device
*udev
= hub
->ports
[port1
- 1]->child
;
4258 if (hub_is_superspeed(udev
))
4264 * Unconfigured devices may not use more than one unit load,
4265 * or 8mA for OTG ports
4267 if (udev
->actconfig
)
4268 delta
= usb_get_max_power(udev
, udev
->actconfig
);
4269 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
4273 if (delta
> hub
->mA_per_port
)
4274 dev_warn(&udev
->dev
,
4275 "%dmA is over %umA budget for port %d!\n",
4276 delta
, hub
->mA_per_port
, port1
);
4279 if (remaining
< 0) {
4280 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
4287 /* Handle physical or logical connection change events.
4288 * This routine is called when:
4289 * a port connection-change occurs;
4290 * a port enable-change occurs (often caused by EMI);
4291 * usb_reset_and_verify_device() encounters changed descriptors (as from
4292 * a firmware download)
4293 * caller already locked the hub
4295 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
4296 u16 portstatus
, u16 portchange
)
4298 struct usb_device
*hdev
= hub
->hdev
;
4299 struct device
*hub_dev
= hub
->intfdev
;
4300 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
4301 unsigned wHubCharacteristics
=
4302 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
4303 struct usb_device
*udev
;
4308 "port %d, status %04x, change %04x, %s\n",
4309 port1
, portstatus
, portchange
, portspeed(hub
, portstatus
));
4311 if (hub
->has_indicators
) {
4312 set_port_led(hub
, port1
, HUB_LED_AUTO
);
4313 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
4316 #ifdef CONFIG_USB_OTG
4317 /* during HNP, don't repeat the debounce */
4318 if (hdev
->bus
->is_b_host
)
4319 portchange
&= ~(USB_PORT_STAT_C_CONNECTION
|
4320 USB_PORT_STAT_C_ENABLE
);
4323 /* Try to resuscitate an existing device */
4324 udev
= hub
->ports
[port1
- 1]->child
;
4325 if ((portstatus
& USB_PORT_STAT_CONNECTION
) && udev
&&
4326 udev
->state
!= USB_STATE_NOTATTACHED
) {
4327 usb_lock_device(udev
);
4328 if (portstatus
& USB_PORT_STAT_ENABLE
) {
4329 status
= 0; /* Nothing to do */
4331 #ifdef CONFIG_PM_RUNTIME
4332 } else if (udev
->state
== USB_STATE_SUSPENDED
&&
4333 udev
->persist_enabled
) {
4334 /* For a suspended device, treat this as a
4335 * remote wakeup event.
4337 status
= usb_remote_wakeup(udev
);
4341 status
= -ENODEV
; /* Don't resuscitate */
4343 usb_unlock_device(udev
);
4346 clear_bit(port1
, hub
->change_bits
);
4351 /* Disconnect any existing devices under this port */
4353 if (hcd
->phy
&& !hdev
->parent
&&
4354 !(portstatus
& USB_PORT_STAT_CONNECTION
))
4355 usb_phy_notify_disconnect(hcd
->phy
, udev
->speed
);
4356 usb_disconnect(&hub
->ports
[port1
- 1]->child
);
4358 clear_bit(port1
, hub
->change_bits
);
4360 /* We can forget about a "removed" device when there's a physical
4361 * disconnect or the connect status changes.
4363 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
4364 (portchange
& USB_PORT_STAT_C_CONNECTION
))
4365 clear_bit(port1
, hub
->removed_bits
);
4367 if (portchange
& (USB_PORT_STAT_C_CONNECTION
|
4368 USB_PORT_STAT_C_ENABLE
)) {
4369 status
= hub_port_debounce_be_stable(hub
, port1
);
4371 if (status
!= -ENODEV
&& printk_ratelimit())
4372 dev_err(hub_dev
, "connect-debounce failed, "
4373 "port %d disabled\n", port1
);
4374 portstatus
&= ~USB_PORT_STAT_CONNECTION
;
4376 portstatus
= status
;
4380 /* Return now if debouncing failed or nothing is connected or
4381 * the device was "removed".
4383 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
4384 test_bit(port1
, hub
->removed_bits
)) {
4386 /* maybe switch power back on (e.g. root hub was reset) */
4387 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
4388 && !port_is_power_on(hub
, portstatus
))
4389 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
4391 if (portstatus
& USB_PORT_STAT_ENABLE
)
4395 if (hub_is_superspeed(hub
->hdev
))
4401 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
4403 /* reallocate for each attempt, since references
4404 * to the previous one can escape in various ways
4406 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
4409 "couldn't allocate port %d usb_device\n",
4414 usb_set_device_state(udev
, USB_STATE_POWERED
);
4415 udev
->bus_mA
= hub
->mA_per_port
;
4416 udev
->level
= hdev
->level
+ 1;
4417 udev
->wusb
= hub_is_wusb(hub
);
4419 /* Only USB 3.0 devices are connected to SuperSpeed hubs. */
4420 if (hub_is_superspeed(hub
->hdev
))
4421 udev
->speed
= USB_SPEED_SUPER
;
4423 udev
->speed
= USB_SPEED_UNKNOWN
;
4425 choose_devnum(udev
);
4426 if (udev
->devnum
<= 0) {
4427 status
= -ENOTCONN
; /* Don't retry */
4431 /* reset (non-USB 3.0 devices) and get descriptor */
4432 status
= hub_port_init(hub
, udev
, port1
, i
);
4436 usb_detect_quirks(udev
);
4437 if (udev
->quirks
& USB_QUIRK_DELAY_INIT
)
4440 /* consecutive bus-powered hubs aren't reliable; they can
4441 * violate the voltage drop budget. if the new child has
4442 * a "powered" LED, users should notice we didn't enable it
4443 * (without reading syslog), even without per-port LEDs
4446 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
4447 && udev
->bus_mA
<= unit_load
) {
4450 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
4453 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
4456 le16_to_cpus(&devstat
);
4457 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
4459 "can't connect bus-powered hub "
4461 if (hub
->has_indicators
) {
4462 hub
->indicator
[port1
-1] =
4463 INDICATOR_AMBER_BLINK
;
4464 schedule_delayed_work (&hub
->leds
, 0);
4466 status
= -ENOTCONN
; /* Don't retry */
4471 /* check for devices running slower than they could */
4472 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
4473 && udev
->speed
== USB_SPEED_FULL
4474 && highspeed_hubs
!= 0)
4475 check_highspeed (hub
, udev
, port1
);
4477 /* Store the parent's children[] pointer. At this point
4478 * udev becomes globally accessible, although presumably
4479 * no one will look at it until hdev is unlocked.
4483 /* We mustn't add new devices if the parent hub has
4484 * been disconnected; we would race with the
4485 * recursively_mark_NOTATTACHED() routine.
4487 spin_lock_irq(&device_state_lock
);
4488 if (hdev
->state
== USB_STATE_NOTATTACHED
)
4491 hub
->ports
[port1
- 1]->child
= udev
;
4492 spin_unlock_irq(&device_state_lock
);
4494 /* Run it through the hoops (find a driver, etc) */
4496 status
= usb_new_device(udev
);
4498 spin_lock_irq(&device_state_lock
);
4499 hub
->ports
[port1
- 1]->child
= NULL
;
4500 spin_unlock_irq(&device_state_lock
);
4507 status
= hub_power_remaining(hub
);
4509 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
4514 hub_port_disable(hub
, port1
, 1);
4516 usb_ep0_reinit(udev
);
4517 release_devnum(udev
);
4520 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
4523 if (hub
->hdev
->parent
||
4524 !hcd
->driver
->port_handed_over
||
4525 !(hcd
->driver
->port_handed_over
)(hcd
, port1
)) {
4526 if (status
!= -ENOTCONN
&& status
!= -ENODEV
)
4527 dev_err(hub_dev
, "unable to enumerate USB device on port %d\n",
4532 hub_port_disable(hub
, port1
, 1);
4533 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
4534 hcd
->driver
->relinquish_port(hcd
, port1
);
4537 /* Returns 1 if there was a remote wakeup and a connect status change. */
4538 static int hub_handle_remote_wakeup(struct usb_hub
*hub
, unsigned int port
,
4539 u16 portstatus
, u16 portchange
)
4541 struct usb_device
*hdev
;
4542 struct usb_device
*udev
;
4543 int connect_change
= 0;
4547 udev
= hub
->ports
[port
- 1]->child
;
4548 if (!hub_is_superspeed(hdev
)) {
4549 if (!(portchange
& USB_PORT_STAT_C_SUSPEND
))
4551 usb_clear_port_feature(hdev
, port
, USB_PORT_FEAT_C_SUSPEND
);
4553 if (!udev
|| udev
->state
!= USB_STATE_SUSPENDED
||
4554 (portstatus
& USB_PORT_STAT_LINK_STATE
) !=
4560 /* TRSMRCY = 10 msec */
4563 usb_lock_device(udev
);
4564 ret
= usb_remote_wakeup(udev
);
4565 usb_unlock_device(udev
);
4570 hub_port_disable(hub
, port
, 1);
4572 dev_dbg(hub
->intfdev
, "resume on port %d, status %d\n",
4574 return connect_change
;
4577 static void hub_events(void)
4579 struct list_head
*tmp
;
4580 struct usb_device
*hdev
;
4581 struct usb_interface
*intf
;
4582 struct usb_hub
*hub
;
4583 struct device
*hub_dev
;
4589 int connect_change
, wakeup_change
;
4592 * We restart the list every time to avoid a deadlock with
4593 * deleting hubs downstream from this one. This should be
4594 * safe since we delete the hub from the event list.
4595 * Not the most efficient, but avoids deadlocks.
4599 /* Grab the first entry at the beginning of the list */
4600 spin_lock_irq(&hub_event_lock
);
4601 if (list_empty(&hub_event_list
)) {
4602 spin_unlock_irq(&hub_event_lock
);
4606 tmp
= hub_event_list
.next
;
4609 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
4610 kref_get(&hub
->kref
);
4611 spin_unlock_irq(&hub_event_lock
);
4614 hub_dev
= hub
->intfdev
;
4615 intf
= to_usb_interface(hub_dev
);
4616 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
4617 hdev
->state
, hub
->descriptor
4618 ? hub
->descriptor
->bNbrPorts
4620 /* NOTE: expects max 15 ports... */
4621 (u16
) hub
->change_bits
[0],
4622 (u16
) hub
->event_bits
[0]);
4624 /* Lock the device, then check to see if we were
4625 * disconnected while waiting for the lock to succeed. */
4626 usb_lock_device(hdev
);
4627 if (unlikely(hub
->disconnected
))
4628 goto loop_disconnected
;
4630 /* If the hub has died, clean up after it */
4631 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
4632 hub
->error
= -ENODEV
;
4633 hub_quiesce(hub
, HUB_DISCONNECT
);
4638 ret
= usb_autopm_get_interface(intf
);
4640 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
4644 /* If this is an inactive hub, do nothing */
4649 dev_dbg (hub_dev
, "resetting for error %d\n",
4652 ret
= usb_reset_device(hdev
);
4655 "error resetting hub: %d\n", ret
);
4663 /* deal with port status changes */
4664 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
4665 if (test_bit(i
, hub
->busy_bits
))
4667 connect_change
= test_bit(i
, hub
->change_bits
);
4668 wakeup_change
= test_and_clear_bit(i
, hub
->wakeup_bits
);
4669 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
4670 !connect_change
&& !wakeup_change
)
4673 ret
= hub_port_status(hub
, i
,
4674 &portstatus
, &portchange
);
4678 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
4679 usb_clear_port_feature(hdev
, i
,
4680 USB_PORT_FEAT_C_CONNECTION
);
4684 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
4685 if (!connect_change
)
4687 "port %d enable change, "
4690 usb_clear_port_feature(hdev
, i
,
4691 USB_PORT_FEAT_C_ENABLE
);
4694 * EM interference sometimes causes badly
4695 * shielded USB devices to be shutdown by
4696 * the hub, this hack enables them again.
4697 * Works at least with mouse driver.
4699 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
4701 && hub
->ports
[i
- 1]->child
) {
4704 "disabled by hub (EMI?), "
4711 if (hub_handle_remote_wakeup(hub
, i
,
4712 portstatus
, portchange
))
4715 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
4719 dev_dbg(hub_dev
, "over-current change on port "
4721 usb_clear_port_feature(hdev
, i
,
4722 USB_PORT_FEAT_C_OVER_CURRENT
);
4723 msleep(100); /* Cool down */
4724 hub_power_on(hub
, true);
4725 hub_port_status(hub
, i
, &status
, &unused
);
4726 if (status
& USB_PORT_STAT_OVERCURRENT
)
4727 dev_err(hub_dev
, "over-current "
4728 "condition on port %d\n", i
);
4731 if (portchange
& USB_PORT_STAT_C_RESET
) {
4733 "reset change on port %d\n",
4735 usb_clear_port_feature(hdev
, i
,
4736 USB_PORT_FEAT_C_RESET
);
4738 if ((portchange
& USB_PORT_STAT_C_BH_RESET
) &&
4739 hub_is_superspeed(hub
->hdev
)) {
4741 "warm reset change on port %d\n",
4743 usb_clear_port_feature(hdev
, i
,
4744 USB_PORT_FEAT_C_BH_PORT_RESET
);
4746 if (portchange
& USB_PORT_STAT_C_LINK_STATE
) {
4747 usb_clear_port_feature(hub
->hdev
, i
,
4748 USB_PORT_FEAT_C_PORT_LINK_STATE
);
4750 if (portchange
& USB_PORT_STAT_C_CONFIG_ERROR
) {
4752 "config error on port %d\n",
4754 usb_clear_port_feature(hub
->hdev
, i
,
4755 USB_PORT_FEAT_C_PORT_CONFIG_ERROR
);
4758 /* Warm reset a USB3 protocol port if it's in
4759 * SS.Inactive state.
4761 if (hub_port_warm_reset_required(hub
, portstatus
)) {
4763 struct usb_device
*udev
=
4764 hub
->ports
[i
- 1]->child
;
4766 dev_dbg(hub_dev
, "warm reset port %d\n", i
);
4768 status
= hub_port_reset(hub
, i
,
4769 NULL
, HUB_BH_RESET_TIME
,
4772 hub_port_disable(hub
, i
, 1);
4774 usb_lock_device(udev
);
4775 status
= usb_reset_device(udev
);
4776 usb_unlock_device(udev
);
4782 hub_port_connect_change(hub
, i
,
4783 portstatus
, portchange
);
4786 /* deal with hub status changes */
4787 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
4789 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
4790 dev_err (hub_dev
, "get_hub_status failed\n");
4792 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
4793 dev_dbg (hub_dev
, "power change\n");
4794 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
4795 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
4796 /* FIXME: Is this always true? */
4797 hub
->limited_power
= 1;
4799 hub
->limited_power
= 0;
4801 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
4805 dev_dbg(hub_dev
, "over-current change\n");
4806 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
4807 msleep(500); /* Cool down */
4808 hub_power_on(hub
, true);
4809 hub_hub_status(hub
, &status
, &unused
);
4810 if (status
& HUB_STATUS_OVERCURRENT
)
4811 dev_err(hub_dev
, "over-current "
4817 /* Balance the usb_autopm_get_interface() above */
4818 usb_autopm_put_interface_no_suspend(intf
);
4820 /* Balance the usb_autopm_get_interface_no_resume() in
4821 * kick_khubd() and allow autosuspend.
4823 usb_autopm_put_interface(intf
);
4825 usb_unlock_device(hdev
);
4826 kref_put(&hub
->kref
, hub_release
);
4828 } /* end while (1) */
4831 static int hub_thread(void *__unused
)
4833 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
4834 * port handover. Otherwise it might see that a full-speed device
4835 * was gone before the EHCI controller had handed its port over to
4836 * the companion full-speed controller.
4842 wait_event_freezable(khubd_wait
,
4843 !list_empty(&hub_event_list
) ||
4844 kthread_should_stop());
4845 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
4847 pr_debug("%s: khubd exiting\n", usbcore_name
);
4851 static const struct usb_device_id hub_id_table
[] = {
4852 { .match_flags
= USB_DEVICE_ID_MATCH_VENDOR
4853 | USB_DEVICE_ID_MATCH_INT_CLASS
,
4854 .idVendor
= USB_VENDOR_GENESYS_LOGIC
,
4855 .bInterfaceClass
= USB_CLASS_HUB
,
4856 .driver_info
= HUB_QUIRK_CHECK_PORT_AUTOSUSPEND
},
4857 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
4858 .bDeviceClass
= USB_CLASS_HUB
},
4859 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
4860 .bInterfaceClass
= USB_CLASS_HUB
},
4861 { } /* Terminating entry */
4864 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
4866 static struct usb_driver hub_driver
= {
4869 .disconnect
= hub_disconnect
,
4870 .suspend
= hub_suspend
,
4871 .resume
= hub_resume
,
4872 .reset_resume
= hub_reset_resume
,
4873 .pre_reset
= hub_pre_reset
,
4874 .post_reset
= hub_post_reset
,
4875 .unlocked_ioctl
= hub_ioctl
,
4876 .id_table
= hub_id_table
,
4877 .supports_autosuspend
= 1,
4880 int usb_hub_init(void)
4882 if (usb_register(&hub_driver
) < 0) {
4883 printk(KERN_ERR
"%s: can't register hub driver\n",
4888 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
4889 if (!IS_ERR(khubd_task
))
4892 /* Fall through if kernel_thread failed */
4893 usb_deregister(&hub_driver
);
4894 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
4899 void usb_hub_cleanup(void)
4901 kthread_stop(khubd_task
);
4904 * Hub resources are freed for us by usb_deregister. It calls
4905 * usb_driver_purge on every device which in turn calls that
4906 * devices disconnect function if it is using this driver.
4907 * The hub_disconnect function takes care of releasing the
4908 * individual hub resources. -greg
4910 usb_deregister(&hub_driver
);
4911 } /* usb_hub_cleanup() */
4913 static int descriptors_changed(struct usb_device
*udev
,
4914 struct usb_device_descriptor
*old_device_descriptor
)
4918 unsigned serial_len
= 0;
4920 unsigned old_length
;
4924 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
4925 sizeof(*old_device_descriptor
)) != 0)
4928 /* Since the idVendor, idProduct, and bcdDevice values in the
4929 * device descriptor haven't changed, we will assume the
4930 * Manufacturer and Product strings haven't changed either.
4931 * But the SerialNumber string could be different (e.g., a
4932 * different flash card of the same brand).
4935 serial_len
= strlen(udev
->serial
) + 1;
4938 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
4939 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
4940 len
= max(len
, old_length
);
4943 buf
= kmalloc(len
, GFP_NOIO
);
4945 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
4946 /* assume the worst */
4949 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
4950 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
4951 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
4953 if (length
!= old_length
) {
4954 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
4959 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
4961 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
4963 ((struct usb_config_descriptor
*) buf
)->
4964 bConfigurationValue
);
4970 if (!changed
&& serial_len
) {
4971 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
4973 if (length
+ 1 != serial_len
) {
4974 dev_dbg(&udev
->dev
, "serial string error %d\n",
4977 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
4978 dev_dbg(&udev
->dev
, "serial string changed\n");
4988 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
4989 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
4991 * WARNING - don't use this routine to reset a composite device
4992 * (one with multiple interfaces owned by separate drivers)!
4993 * Use usb_reset_device() instead.
4995 * Do a port reset, reassign the device's address, and establish its
4996 * former operating configuration. If the reset fails, or the device's
4997 * descriptors change from their values before the reset, or the original
4998 * configuration and altsettings cannot be restored, a flag will be set
4999 * telling khubd to pretend the device has been disconnected and then
5000 * re-connected. All drivers will be unbound, and the device will be
5001 * re-enumerated and probed all over again.
5003 * Returns 0 if the reset succeeded, -ENODEV if the device has been
5004 * flagged for logical disconnection, or some other negative error code
5005 * if the reset wasn't even attempted.
5007 * The caller must own the device lock. For example, it's safe to use
5008 * this from a driver probe() routine after downloading new firmware.
5009 * For calls that might not occur during probe(), drivers should lock
5010 * the device using usb_lock_device_for_reset().
5012 * Locking exception: This routine may also be called from within an
5013 * autoresume handler. Such usage won't conflict with other tasks
5014 * holding the device lock because these tasks should always call
5015 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
5017 static int usb_reset_and_verify_device(struct usb_device
*udev
)
5019 struct usb_device
*parent_hdev
= udev
->parent
;
5020 struct usb_hub
*parent_hub
;
5021 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
5022 struct usb_device_descriptor descriptor
= udev
->descriptor
;
5024 int port1
= udev
->portnum
;
5026 if (udev
->state
== USB_STATE_NOTATTACHED
||
5027 udev
->state
== USB_STATE_SUSPENDED
) {
5028 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
5034 /* this requires hcd-specific logic; see ohci_restart() */
5035 dev_dbg(&udev
->dev
, "%s for root hub!\n", __func__
);
5038 parent_hub
= usb_hub_to_struct_hub(parent_hdev
);
5040 /* Disable LPM and LTM while we reset the device and reinstall the alt
5041 * settings. Device-initiated LPM settings, and system exit latency
5042 * settings are cleared when the device is reset, so we have to set
5045 ret
= usb_unlocked_disable_lpm(udev
);
5047 dev_err(&udev
->dev
, "%s Failed to disable LPM\n.", __func__
);
5050 ret
= usb_disable_ltm(udev
);
5052 dev_err(&udev
->dev
, "%s Failed to disable LTM\n.",
5057 set_bit(port1
, parent_hub
->busy_bits
);
5058 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
5060 /* ep0 maxpacket size may change; let the HCD know about it.
5061 * Other endpoints will be handled by re-enumeration. */
5062 usb_ep0_reinit(udev
);
5063 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
5064 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
5067 clear_bit(port1
, parent_hub
->busy_bits
);
5072 /* Device might have changed firmware (DFU or similar) */
5073 if (descriptors_changed(udev
, &descriptor
)) {
5074 dev_info(&udev
->dev
, "device firmware changed\n");
5075 udev
->descriptor
= descriptor
; /* for disconnect() calls */
5079 /* Restore the device's previous configuration */
5080 if (!udev
->actconfig
)
5083 mutex_lock(hcd
->bandwidth_mutex
);
5084 ret
= usb_hcd_alloc_bandwidth(udev
, udev
->actconfig
, NULL
, NULL
);
5086 dev_warn(&udev
->dev
,
5087 "Busted HC? Not enough HCD resources for "
5088 "old configuration.\n");
5089 mutex_unlock(hcd
->bandwidth_mutex
);
5092 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
5093 USB_REQ_SET_CONFIGURATION
, 0,
5094 udev
->actconfig
->desc
.bConfigurationValue
, 0,
5095 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
5098 "can't restore configuration #%d (error=%d)\n",
5099 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
5100 mutex_unlock(hcd
->bandwidth_mutex
);
5103 mutex_unlock(hcd
->bandwidth_mutex
);
5104 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
5106 /* Put interfaces back into the same altsettings as before.
5107 * Don't bother to send the Set-Interface request for interfaces
5108 * that were already in altsetting 0; besides being unnecessary,
5109 * many devices can't handle it. Instead just reset the host-side
5112 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
5113 struct usb_host_config
*config
= udev
->actconfig
;
5114 struct usb_interface
*intf
= config
->interface
[i
];
5115 struct usb_interface_descriptor
*desc
;
5117 desc
= &intf
->cur_altsetting
->desc
;
5118 if (desc
->bAlternateSetting
== 0) {
5119 usb_disable_interface(udev
, intf
, true);
5120 usb_enable_interface(udev
, intf
, true);
5123 /* Let the bandwidth allocation function know that this
5124 * device has been reset, and it will have to use
5125 * alternate setting 0 as the current alternate setting.
5127 intf
->resetting_device
= 1;
5128 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
5129 desc
->bAlternateSetting
);
5130 intf
->resetting_device
= 0;
5133 dev_err(&udev
->dev
, "failed to restore interface %d "
5134 "altsetting %d (error=%d)\n",
5135 desc
->bInterfaceNumber
,
5136 desc
->bAlternateSetting
,
5143 /* Now that the alt settings are re-installed, enable LTM and LPM. */
5144 usb_unlocked_enable_lpm(udev
);
5145 usb_enable_ltm(udev
);
5149 /* LPM state doesn't matter when we're about to destroy the device. */
5150 hub_port_logical_disconnect(parent_hub
, port1
);
5155 * usb_reset_device - warn interface drivers and perform a USB port reset
5156 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5158 * Warns all drivers bound to registered interfaces (using their pre_reset
5159 * method), performs the port reset, and then lets the drivers know that
5160 * the reset is over (using their post_reset method).
5162 * Return value is the same as for usb_reset_and_verify_device().
5164 * The caller must own the device lock. For example, it's safe to use
5165 * this from a driver probe() routine after downloading new firmware.
5166 * For calls that might not occur during probe(), drivers should lock
5167 * the device using usb_lock_device_for_reset().
5169 * If an interface is currently being probed or disconnected, we assume
5170 * its driver knows how to handle resets. For all other interfaces,
5171 * if the driver doesn't have pre_reset and post_reset methods then
5172 * we attempt to unbind it and rebind afterward.
5174 int usb_reset_device(struct usb_device
*udev
)
5178 unsigned int noio_flag
;
5179 struct usb_host_config
*config
= udev
->actconfig
;
5181 if (udev
->state
== USB_STATE_NOTATTACHED
||
5182 udev
->state
== USB_STATE_SUSPENDED
) {
5183 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
5189 * Don't allocate memory with GFP_KERNEL in current
5190 * context to avoid possible deadlock if usb mass
5191 * storage interface or usbnet interface(iSCSI case)
5192 * is included in current configuration. The easist
5193 * approach is to do it for every device reset,
5194 * because the device 'memalloc_noio' flag may have
5195 * not been set before reseting the usb device.
5197 noio_flag
= memalloc_noio_save();
5199 /* Prevent autosuspend during the reset */
5200 usb_autoresume_device(udev
);
5203 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
5204 struct usb_interface
*cintf
= config
->interface
[i
];
5205 struct usb_driver
*drv
;
5208 if (cintf
->dev
.driver
) {
5209 drv
= to_usb_driver(cintf
->dev
.driver
);
5210 if (drv
->pre_reset
&& drv
->post_reset
)
5211 unbind
= (drv
->pre_reset
)(cintf
);
5212 else if (cintf
->condition
==
5213 USB_INTERFACE_BOUND
)
5216 usb_forced_unbind_intf(cintf
);
5221 ret
= usb_reset_and_verify_device(udev
);
5224 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
5225 struct usb_interface
*cintf
= config
->interface
[i
];
5226 struct usb_driver
*drv
;
5227 int rebind
= cintf
->needs_binding
;
5229 if (!rebind
&& cintf
->dev
.driver
) {
5230 drv
= to_usb_driver(cintf
->dev
.driver
);
5231 if (drv
->post_reset
)
5232 rebind
= (drv
->post_reset
)(cintf
);
5233 else if (cintf
->condition
==
5234 USB_INTERFACE_BOUND
)
5237 if (ret
== 0 && rebind
)
5238 usb_rebind_intf(cintf
);
5242 usb_autosuspend_device(udev
);
5243 memalloc_noio_restore(noio_flag
);
5246 EXPORT_SYMBOL_GPL(usb_reset_device
);
5250 * usb_queue_reset_device - Reset a USB device from an atomic context
5251 * @iface: USB interface belonging to the device to reset
5253 * This function can be used to reset a USB device from an atomic
5254 * context, where usb_reset_device() won't work (as it blocks).
5256 * Doing a reset via this method is functionally equivalent to calling
5257 * usb_reset_device(), except for the fact that it is delayed to a
5258 * workqueue. This means that any drivers bound to other interfaces
5259 * might be unbound, as well as users from usbfs in user space.
5263 * - Scheduling two resets at the same time from two different drivers
5264 * attached to two different interfaces of the same device is
5265 * possible; depending on how the driver attached to each interface
5266 * handles ->pre_reset(), the second reset might happen or not.
5268 * - If a driver is unbound and it had a pending reset, the reset will
5271 * - This function can be called during .probe() or .disconnect()
5272 * times. On return from .disconnect(), any pending resets will be
5275 * There is no no need to lock/unlock the @reset_ws as schedule_work()
5278 * NOTE: We don't do any reference count tracking because it is not
5279 * needed. The lifecycle of the work_struct is tied to the
5280 * usb_interface. Before destroying the interface we cancel the
5281 * work_struct, so the fact that work_struct is queued and or
5282 * running means the interface (and thus, the device) exist and
5285 void usb_queue_reset_device(struct usb_interface
*iface
)
5287 schedule_work(&iface
->reset_ws
);
5289 EXPORT_SYMBOL_GPL(usb_queue_reset_device
);
5292 * usb_hub_find_child - Get the pointer of child device
5293 * attached to the port which is specified by @port1.
5294 * @hdev: USB device belonging to the usb hub
5295 * @port1: port num to indicate which port the child device
5298 * USB drivers call this function to get hub's child device
5301 * Return NULL if input param is invalid and
5302 * child's usb_device pointer if non-NULL.
5304 struct usb_device
*usb_hub_find_child(struct usb_device
*hdev
,
5307 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5309 if (port1
< 1 || port1
> hdev
->maxchild
)
5311 return hub
->ports
[port1
- 1]->child
;
5313 EXPORT_SYMBOL_GPL(usb_hub_find_child
);
5316 * usb_set_hub_port_connect_type - set hub port connect type.
5317 * @hdev: USB device belonging to the usb hub
5318 * @port1: port num of the port
5319 * @type: connect type of the port
5321 void usb_set_hub_port_connect_type(struct usb_device
*hdev
, int port1
,
5322 enum usb_port_connect_type type
)
5324 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5326 hub
->ports
[port1
- 1]->connect_type
= type
;
5330 * usb_get_hub_port_connect_type - Get the port's connect type
5331 * @hdev: USB device belonging to the usb hub
5332 * @port1: port num of the port
5334 * Return connect type of the port and if input params are
5335 * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN.
5337 enum usb_port_connect_type
5338 usb_get_hub_port_connect_type(struct usb_device
*hdev
, int port1
)
5340 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5342 return hub
->ports
[port1
- 1]->connect_type
;
5345 void usb_hub_adjust_deviceremovable(struct usb_device
*hdev
,
5346 struct usb_hub_descriptor
*desc
)
5348 enum usb_port_connect_type connect_type
;
5351 if (!hub_is_superspeed(hdev
)) {
5352 for (i
= 1; i
<= hdev
->maxchild
; i
++) {
5353 connect_type
= usb_get_hub_port_connect_type(hdev
, i
);
5355 if (connect_type
== USB_PORT_CONNECT_TYPE_HARD_WIRED
) {
5356 u8 mask
= 1 << (i
%8);
5358 if (!(desc
->u
.hs
.DeviceRemovable
[i
/8] & mask
)) {
5359 dev_dbg(&hdev
->dev
, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n",
5361 desc
->u
.hs
.DeviceRemovable
[i
/8] |= mask
;
5366 u16 port_removable
= le16_to_cpu(desc
->u
.ss
.DeviceRemovable
);
5368 for (i
= 1; i
<= hdev
->maxchild
; i
++) {
5369 connect_type
= usb_get_hub_port_connect_type(hdev
, i
);
5371 if (connect_type
== USB_PORT_CONNECT_TYPE_HARD_WIRED
) {
5374 if (!(port_removable
& mask
)) {
5375 dev_dbg(&hdev
->dev
, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n",
5377 port_removable
|= mask
;
5382 desc
->u
.ss
.DeviceRemovable
= cpu_to_le16(port_removable
);
5388 * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
5389 * @hdev: USB device belonging to the usb hub
5390 * @port1: port num of the port
5392 * Return port's acpi handle if successful, NULL if params are
5395 acpi_handle
usb_get_hub_port_acpi_handle(struct usb_device
*hdev
,
5398 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5400 return DEVICE_ACPI_HANDLE(&hub
->ports
[port1
- 1]->dev
);