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/smp_lock.h>
20 #include <linux/ioctl.h>
21 #include <linux/usb.h>
22 #include <linux/usbdevice_fs.h>
23 #include <linux/kthread.h>
24 #include <linux/mutex.h>
26 #include <asm/semaphore.h>
27 #include <asm/uaccess.h>
28 #include <asm/byteorder.h>
35 struct device
*intfdev
; /* the "interface" device */
36 struct usb_device
*hdev
;
37 struct urb
*urb
; /* for interrupt polling pipe */
39 /* buffer for urb ... with extra space in case of babble */
41 dma_addr_t buffer_dma
; /* DMA address for buffer */
43 struct usb_hub_status hub
;
44 struct usb_port_status port
;
45 } *status
; /* buffer for status reports */
47 int error
; /* last reported error */
48 int nerrors
; /* track consecutive errors */
50 struct list_head event_list
; /* hubs w/data or errs ready */
51 unsigned long event_bits
[1]; /* status change bitmask */
52 unsigned long change_bits
[1]; /* ports with logical connect
54 unsigned long busy_bits
[1]; /* ports being reset or
56 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
57 #error event_bits[] is too short!
60 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
61 struct usb_tt tt
; /* Transaction Translator */
63 unsigned mA_per_port
; /* current for each child */
65 unsigned limited_power
:1;
67 unsigned activating
:1;
69 unsigned has_indicators
:1;
70 u8 indicator
[USB_MAXCHILDREN
];
71 struct work_struct leds
;
75 /* Protect struct usb_device->state and ->children members
76 * Note: Both are also protected by ->dev.sem, except that ->state can
77 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
78 static DEFINE_SPINLOCK(device_state_lock
);
80 /* khubd's worklist and its lock */
81 static DEFINE_SPINLOCK(hub_event_lock
);
82 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
85 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
87 static struct task_struct
*khubd_task
;
89 /* multithreaded probe logic */
90 static int multithread_probe
=
91 #ifdef CONFIG_USB_MULTITHREAD_PROBE
96 module_param(multithread_probe
, bool, S_IRUGO
);
97 MODULE_PARM_DESC(multithread_probe
, "Run each USB device probe in a new thread");
99 /* cycle leds on hubs that aren't blinking for attention */
100 static int blinkenlights
= 0;
101 module_param (blinkenlights
, bool, S_IRUGO
);
102 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
105 * As of 2.6.10 we introduce a new USB device initialization scheme which
106 * closely resembles the way Windows works. Hopefully it will be compatible
107 * with a wider range of devices than the old scheme. However some previously
108 * working devices may start giving rise to "device not accepting address"
109 * errors; if that happens the user can try the old scheme by adjusting the
110 * following module parameters.
112 * For maximum flexibility there are two boolean parameters to control the
113 * hub driver's behavior. On the first initialization attempt, if the
114 * "old_scheme_first" parameter is set then the old scheme will be used,
115 * otherwise the new scheme is used. If that fails and "use_both_schemes"
116 * is set, then the driver will make another attempt, using the other scheme.
118 static int old_scheme_first
= 0;
119 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
120 MODULE_PARM_DESC(old_scheme_first
,
121 "start with the old device initialization scheme");
123 static int use_both_schemes
= 1;
124 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
125 MODULE_PARM_DESC(use_both_schemes
,
126 "try the other device initialization scheme if the "
131 static inline char *portspeed (int portstatus
)
133 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
135 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
142 /* Note that hdev or one of its children must be locked! */
143 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
145 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
148 /* USB 2.0 spec Section 11.24.4.5 */
149 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
153 for (i
= 0; i
< 3; i
++) {
154 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
155 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
156 USB_DT_HUB
<< 8, 0, data
, size
,
157 USB_CTRL_GET_TIMEOUT
);
158 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
165 * USB 2.0 spec Section 11.24.2.1
167 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
169 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
170 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
174 * USB 2.0 spec Section 11.24.2.2
176 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
178 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
179 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
184 * USB 2.0 spec Section 11.24.2.13
186 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
188 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
189 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
194 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
195 * for info about using port indicators
197 static void set_port_led(
203 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
204 USB_PORT_FEAT_INDICATOR
);
206 dev_dbg (hub
->intfdev
,
207 "port %d indicator %s status %d\n",
209 ({ char *s
; switch (selector
) {
210 case HUB_LED_AMBER
: s
= "amber"; break;
211 case HUB_LED_GREEN
: s
= "green"; break;
212 case HUB_LED_OFF
: s
= "off"; break;
213 case HUB_LED_AUTO
: s
= "auto"; break;
214 default: s
= "??"; break;
219 #define LED_CYCLE_PERIOD ((2*HZ)/3)
221 static void led_work (void *__hub
)
223 struct usb_hub
*hub
= __hub
;
224 struct usb_device
*hdev
= hub
->hdev
;
226 unsigned changed
= 0;
229 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
232 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
233 unsigned selector
, mode
;
235 /* 30%-50% duty cycle */
237 switch (hub
->indicator
[i
]) {
239 case INDICATOR_CYCLE
:
241 selector
= HUB_LED_AUTO
;
242 mode
= INDICATOR_AUTO
;
244 /* blinking green = sw attention */
245 case INDICATOR_GREEN_BLINK
:
246 selector
= HUB_LED_GREEN
;
247 mode
= INDICATOR_GREEN_BLINK_OFF
;
249 case INDICATOR_GREEN_BLINK_OFF
:
250 selector
= HUB_LED_OFF
;
251 mode
= INDICATOR_GREEN_BLINK
;
253 /* blinking amber = hw attention */
254 case INDICATOR_AMBER_BLINK
:
255 selector
= HUB_LED_AMBER
;
256 mode
= INDICATOR_AMBER_BLINK_OFF
;
258 case INDICATOR_AMBER_BLINK_OFF
:
259 selector
= HUB_LED_OFF
;
260 mode
= INDICATOR_AMBER_BLINK
;
262 /* blink green/amber = reserved */
263 case INDICATOR_ALT_BLINK
:
264 selector
= HUB_LED_GREEN
;
265 mode
= INDICATOR_ALT_BLINK_OFF
;
267 case INDICATOR_ALT_BLINK_OFF
:
268 selector
= HUB_LED_AMBER
;
269 mode
= INDICATOR_ALT_BLINK
;
274 if (selector
!= HUB_LED_AUTO
)
276 set_port_led(hub
, i
+ 1, selector
);
277 hub
->indicator
[i
] = mode
;
279 if (!changed
&& blinkenlights
) {
281 cursor
%= hub
->descriptor
->bNbrPorts
;
282 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
283 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
287 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
290 /* use a short timeout for hub/port status fetches */
291 #define USB_STS_TIMEOUT 1000
292 #define USB_STS_RETRIES 5
295 * USB 2.0 spec Section 11.24.2.6
297 static int get_hub_status(struct usb_device
*hdev
,
298 struct usb_hub_status
*data
)
300 int i
, status
= -ETIMEDOUT
;
302 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
303 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
304 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
305 data
, sizeof(*data
), USB_STS_TIMEOUT
);
311 * USB 2.0 spec Section 11.24.2.7
313 static int get_port_status(struct usb_device
*hdev
, int port1
,
314 struct usb_port_status
*data
)
316 int i
, status
= -ETIMEDOUT
;
318 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
319 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
320 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
321 data
, sizeof(*data
), USB_STS_TIMEOUT
);
326 static void kick_khubd(struct usb_hub
*hub
)
330 /* Suppress autosuspend until khubd runs */
331 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
333 spin_lock_irqsave(&hub_event_lock
, flags
);
334 if (list_empty(&hub
->event_list
)) {
335 list_add_tail(&hub
->event_list
, &hub_event_list
);
336 wake_up(&khubd_wait
);
338 spin_unlock_irqrestore(&hub_event_lock
, flags
);
341 void usb_kick_khubd(struct usb_device
*hdev
)
343 kick_khubd(hdev_to_hub(hdev
));
347 /* completion function, fires on port status changes and various faults */
348 static void hub_irq(struct urb
*urb
)
350 struct usb_hub
*hub
= urb
->context
;
355 switch (urb
->status
) {
356 case -ENOENT
: /* synchronous unlink */
357 case -ECONNRESET
: /* async unlink */
358 case -ESHUTDOWN
: /* hardware going away */
361 default: /* presumably an error */
362 /* Cause a hub reset after 10 consecutive errors */
363 dev_dbg (hub
->intfdev
, "transfer --> %d\n", urb
->status
);
364 if ((++hub
->nerrors
< 10) || hub
->error
)
366 hub
->error
= urb
->status
;
369 /* let khubd handle things */
370 case 0: /* we got data: port status changed */
372 for (i
= 0; i
< urb
->actual_length
; ++i
)
373 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
375 hub
->event_bits
[0] = bits
;
381 /* Something happened, let khubd figure it out */
388 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
389 && status
!= -ENODEV
&& status
!= -EPERM
)
390 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
393 /* USB 2.0 spec Section 11.24.2.3 */
395 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
397 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
398 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
403 * enumeration blocks khubd for a long time. we use keventd instead, since
404 * long blocking there is the exception, not the rule. accordingly, HCDs
405 * talking to TTs must queue control transfers (not just bulk and iso), so
406 * both can talk to the same hub concurrently.
408 static void hub_tt_kevent (void *arg
)
410 struct usb_hub
*hub
= arg
;
413 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
414 while (!list_empty (&hub
->tt
.clear_list
)) {
415 struct list_head
*temp
;
416 struct usb_tt_clear
*clear
;
417 struct usb_device
*hdev
= hub
->hdev
;
420 temp
= hub
->tt
.clear_list
.next
;
421 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
422 list_del (&clear
->clear_list
);
424 /* drop lock so HCD can concurrently report other TT errors */
425 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
426 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
427 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
431 "clear tt %d (%04x) error %d\n",
432 clear
->tt
, clear
->devinfo
, status
);
435 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
439 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
440 * @udev: the device whose split transaction failed
441 * @pipe: identifies the endpoint of the failed transaction
443 * High speed HCDs use this to tell the hub driver that some split control or
444 * bulk transaction failed in a way that requires clearing internal state of
445 * a transaction translator. This is normally detected (and reported) from
448 * It may not be possible for that hub to handle additional full (or low)
449 * speed transactions until that state is fully cleared out.
451 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
453 struct usb_tt
*tt
= udev
->tt
;
455 struct usb_tt_clear
*clear
;
457 /* we've got to cope with an arbitrary number of pending TT clears,
458 * since each TT has "at least two" buffers that can need it (and
459 * there can be many TTs per hub). even if they're uncommon.
461 if ((clear
= kmalloc (sizeof *clear
, SLAB_ATOMIC
)) == NULL
) {
462 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
463 /* FIXME recover somehow ... RESET_TT? */
467 /* info that CLEAR_TT_BUFFER needs */
468 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
469 clear
->devinfo
= usb_pipeendpoint (pipe
);
470 clear
->devinfo
|= udev
->devnum
<< 4;
471 clear
->devinfo
|= usb_pipecontrol (pipe
)
472 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
473 : (USB_ENDPOINT_XFER_BULK
<< 11);
474 if (usb_pipein (pipe
))
475 clear
->devinfo
|= 1 << 15;
477 /* tell keventd to clear state for this TT */
478 spin_lock_irqsave (&tt
->lock
, flags
);
479 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
480 schedule_work (&tt
->kevent
);
481 spin_unlock_irqrestore (&tt
->lock
, flags
);
484 static void hub_power_on(struct usb_hub
*hub
)
487 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
488 u16 wHubCharacteristics
=
489 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
491 /* Enable power on each port. Some hubs have reserved values
492 * of LPSM (> 2) in their descriptors, even though they are
493 * USB 2.0 hubs. Some hubs do not implement port-power switching
494 * but only emulate it. In all cases, the ports won't work
495 * unless we send these messages to the hub.
497 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
498 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
500 dev_dbg(hub
->intfdev
, "trying to enable port power on "
501 "non-switchable hub\n");
502 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
503 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
505 /* Wait at least 100 msec for power to become stable */
506 msleep(max(pgood_delay
, (unsigned) 100));
509 static void hub_quiesce(struct usb_hub
*hub
)
511 /* (nonblocking) khubd and related activity won't re-trigger */
515 /* (blocking) stop khubd and related activity */
516 usb_kill_urb(hub
->urb
);
517 if (hub
->has_indicators
)
518 cancel_delayed_work(&hub
->leds
);
519 if (hub
->has_indicators
|| hub
->tt
.hub
)
520 flush_scheduled_work();
523 static void hub_activate(struct usb_hub
*hub
)
530 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
532 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
533 if (hub
->has_indicators
&& blinkenlights
)
534 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
536 /* scan all ports ASAP */
540 static int hub_hub_status(struct usb_hub
*hub
,
541 u16
*status
, u16
*change
)
545 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
547 dev_err (hub
->intfdev
,
548 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
550 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
551 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
557 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
559 struct usb_device
*hdev
= hub
->hdev
;
562 if (hdev
->children
[port1
-1] && set_state
) {
563 usb_set_device_state(hdev
->children
[port1
-1],
564 USB_STATE_NOTATTACHED
);
566 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
568 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
575 /* caller has locked the hub device */
576 static void hub_pre_reset(struct usb_interface
*intf
)
578 struct usb_hub
*hub
= usb_get_intfdata(intf
);
579 struct usb_device
*hdev
= hub
->hdev
;
582 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
583 if (hdev
->children
[port1
- 1]) {
584 usb_disconnect(&hdev
->children
[port1
- 1]);
586 hub_port_disable(hub
, port1
, 0);
592 /* caller has locked the hub device */
593 static void hub_post_reset(struct usb_interface
*intf
)
595 struct usb_hub
*hub
= usb_get_intfdata(intf
);
602 static int hub_configure(struct usb_hub
*hub
,
603 struct usb_endpoint_descriptor
*endpoint
)
605 struct usb_device
*hdev
= hub
->hdev
;
606 struct device
*hub_dev
= hub
->intfdev
;
607 u16 hubstatus
, hubchange
;
608 u16 wHubCharacteristics
;
613 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
616 message
= "can't allocate hub irq buffer";
621 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
623 message
= "can't kmalloc hub status buffer";
628 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
629 if (!hub
->descriptor
) {
630 message
= "can't kmalloc hub descriptor";
635 /* Request the entire hub descriptor.
636 * hub->descriptor can handle USB_MAXCHILDREN ports,
637 * but the hub can/will return fewer bytes here.
639 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
640 sizeof(*hub
->descriptor
));
642 message
= "can't read hub descriptor";
644 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
645 message
= "hub has too many ports!";
650 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
651 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
652 (hdev
->maxchild
== 1) ? "" : "s");
654 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
656 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
658 char portstr
[USB_MAXCHILDREN
+ 1];
660 for (i
= 0; i
< hdev
->maxchild
; i
++)
661 portstr
[i
] = hub
->descriptor
->DeviceRemovable
662 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
664 portstr
[hdev
->maxchild
] = 0;
665 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
667 dev_dbg(hub_dev
, "standalone hub\n");
669 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
671 dev_dbg(hub_dev
, "ganged power switching\n");
674 dev_dbg(hub_dev
, "individual port power switching\n");
678 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
682 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
684 dev_dbg(hub_dev
, "global over-current protection\n");
687 dev_dbg(hub_dev
, "individual port over-current protection\n");
691 dev_dbg(hub_dev
, "no over-current protection\n");
695 spin_lock_init (&hub
->tt
.lock
);
696 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
697 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
, hub
);
698 switch (hdev
->descriptor
.bDeviceProtocol
) {
702 dev_dbg(hub_dev
, "Single TT\n");
706 ret
= usb_set_interface(hdev
, 0, 1);
708 dev_dbg(hub_dev
, "TT per port\n");
711 dev_err(hub_dev
, "Using single TT (err %d)\n",
716 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
717 hdev
->descriptor
.bDeviceProtocol
);
721 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
722 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
723 case HUB_TTTT_8_BITS
:
724 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
725 hub
->tt
.think_time
= 666;
726 dev_dbg(hub_dev
, "TT requires at most %d "
727 "FS bit times (%d ns)\n",
728 8, hub
->tt
.think_time
);
731 case HUB_TTTT_16_BITS
:
732 hub
->tt
.think_time
= 666 * 2;
733 dev_dbg(hub_dev
, "TT requires at most %d "
734 "FS bit times (%d ns)\n",
735 16, hub
->tt
.think_time
);
737 case HUB_TTTT_24_BITS
:
738 hub
->tt
.think_time
= 666 * 3;
739 dev_dbg(hub_dev
, "TT requires at most %d "
740 "FS bit times (%d ns)\n",
741 24, hub
->tt
.think_time
);
743 case HUB_TTTT_32_BITS
:
744 hub
->tt
.think_time
= 666 * 4;
745 dev_dbg(hub_dev
, "TT requires at most %d "
746 "FS bit times (%d ns)\n",
747 32, hub
->tt
.think_time
);
751 /* probe() zeroes hub->indicator[] */
752 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
753 hub
->has_indicators
= 1;
754 dev_dbg(hub_dev
, "Port indicators are supported\n");
757 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
758 hub
->descriptor
->bPwrOn2PwrGood
* 2);
760 /* power budgeting mostly matters with bus-powered hubs,
761 * and battery-powered root hubs (may provide just 8 mA).
763 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
765 message
= "can't get hub status";
768 le16_to_cpus(&hubstatus
);
769 if (hdev
== hdev
->bus
->root_hub
) {
770 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
771 hub
->mA_per_port
= 500;
773 hub
->mA_per_port
= hdev
->bus_mA
;
774 hub
->limited_power
= 1;
776 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
777 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
778 hub
->descriptor
->bHubContrCurrent
);
779 hub
->limited_power
= 1;
780 if (hdev
->maxchild
> 0) {
781 int remaining
= hdev
->bus_mA
-
782 hub
->descriptor
->bHubContrCurrent
;
784 if (remaining
< hdev
->maxchild
* 100)
786 "insufficient power available "
787 "to use all downstream ports\n");
788 hub
->mA_per_port
= 100; /* 7.2.1.1 */
790 } else { /* Self-powered external hub */
791 /* FIXME: What about battery-powered external hubs that
792 * provide less current per port? */
793 hub
->mA_per_port
= 500;
795 if (hub
->mA_per_port
< 500)
796 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
799 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
801 message
= "can't get hub status";
805 /* local power status reports aren't always correct */
806 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
807 dev_dbg(hub_dev
, "local power source is %s\n",
808 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
809 ? "lost (inactive)" : "good");
811 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
812 dev_dbg(hub_dev
, "%sover-current condition exists\n",
813 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
815 /* set up the interrupt endpoint
816 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
817 * bytes as USB2.0[11.12.3] says because some hubs are known
818 * to send more data (and thus cause overflow). For root hubs,
819 * maxpktsize is defined in hcd.c's fake endpoint descriptors
820 * to be big enough for at least USB_MAXCHILDREN ports. */
821 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
822 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
824 if (maxp
> sizeof(*hub
->buffer
))
825 maxp
= sizeof(*hub
->buffer
);
827 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
829 message
= "couldn't allocate interrupt urb";
834 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
835 hub
, endpoint
->bInterval
);
836 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
837 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
839 /* maybe cycle the hub leds */
840 if (hub
->has_indicators
&& blinkenlights
)
841 hub
->indicator
[0] = INDICATOR_CYCLE
;
848 dev_err (hub_dev
, "config failed, %s (err %d)\n",
850 /* hub_disconnect() frees urb and descriptor */
854 static unsigned highspeed_hubs
;
856 static void hub_disconnect(struct usb_interface
*intf
)
858 struct usb_hub
*hub
= usb_get_intfdata (intf
);
859 struct usb_device
*hdev
;
861 /* Disconnect all children and quiesce the hub */
865 usb_set_intfdata (intf
, NULL
);
868 if (hdev
->speed
== USB_SPEED_HIGH
)
871 usb_free_urb(hub
->urb
);
874 spin_lock_irq(&hub_event_lock
);
875 list_del_init(&hub
->event_list
);
876 spin_unlock_irq(&hub_event_lock
);
878 kfree(hub
->descriptor
);
879 hub
->descriptor
= NULL
;
885 usb_buffer_free(hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
893 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
895 struct usb_host_interface
*desc
;
896 struct usb_endpoint_descriptor
*endpoint
;
897 struct usb_device
*hdev
;
900 desc
= intf
->cur_altsetting
;
901 hdev
= interface_to_usbdev(intf
);
903 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
905 dev_warn(&intf
->dev
, "ignoring external hub\n");
910 /* Some hubs have a subclass of 1, which AFAICT according to the */
911 /* specs is not defined, but it works */
912 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
913 (desc
->desc
.bInterfaceSubClass
!= 1)) {
915 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
919 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
920 if (desc
->desc
.bNumEndpoints
!= 1)
921 goto descriptor_error
;
923 endpoint
= &desc
->endpoint
[0].desc
;
925 /* If it's not an interrupt in endpoint, we'd better punt! */
926 if (!usb_endpoint_is_int_in(endpoint
))
927 goto descriptor_error
;
930 dev_info (&intf
->dev
, "USB hub found\n");
932 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
934 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
938 INIT_LIST_HEAD(&hub
->event_list
);
939 hub
->intfdev
= &intf
->dev
;
941 INIT_WORK(&hub
->leds
, led_work
, hub
);
943 usb_set_intfdata (intf
, hub
);
944 intf
->needs_remote_wakeup
= 1;
946 if (hdev
->speed
== USB_SPEED_HIGH
)
949 if (hub_configure(hub
, endpoint
) >= 0)
952 hub_disconnect (intf
);
957 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
959 struct usb_device
*hdev
= interface_to_usbdev (intf
);
961 /* assert ifno == 0 (part of hub spec) */
963 case USBDEVFS_HUB_PORTINFO
: {
964 struct usbdevfs_hub_portinfo
*info
= user_data
;
967 spin_lock_irq(&device_state_lock
);
968 if (hdev
->devnum
<= 0)
971 info
->nports
= hdev
->maxchild
;
972 for (i
= 0; i
< info
->nports
; i
++) {
973 if (hdev
->children
[i
] == NULL
)
977 hdev
->children
[i
]->devnum
;
980 spin_unlock_irq(&device_state_lock
);
982 return info
->nports
+ 1;
991 /* grab device/port lock, returning index of that port (zero based).
992 * protects the upstream link used by this device from concurrent
993 * tree operations like suspend, resume, reset, and disconnect, which
994 * apply to everything downstream of a given port.
996 static int locktree(struct usb_device
*udev
)
999 struct usb_device
*hdev
;
1004 /* root hub is always the first lock in the series */
1005 hdev
= udev
->parent
;
1007 usb_lock_device(udev
);
1011 /* on the path from root to us, lock everything from
1012 * top down, dropping parent locks when not needed
1018 /* everything is fail-fast once disconnect
1021 if (udev
->state
== USB_STATE_NOTATTACHED
) {
1022 usb_unlock_device(hdev
);
1026 /* when everyone grabs locks top->bottom,
1027 * non-overlapping work may be concurrent
1029 usb_lock_device(udev
);
1030 usb_unlock_device(hdev
);
1031 return udev
->portnum
;
1034 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1038 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1039 if (udev
->children
[i
])
1040 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1042 udev
->state
= USB_STATE_NOTATTACHED
;
1046 * usb_set_device_state - change a device's current state (usbcore, hcds)
1047 * @udev: pointer to device whose state should be changed
1048 * @new_state: new state value to be stored
1050 * udev->state is _not_ fully protected by the device lock. Although
1051 * most transitions are made only while holding the lock, the state can
1052 * can change to USB_STATE_NOTATTACHED at almost any time. This
1053 * is so that devices can be marked as disconnected as soon as possible,
1054 * without having to wait for any semaphores to be released. As a result,
1055 * all changes to any device's state must be protected by the
1056 * device_state_lock spinlock.
1058 * Once a device has been added to the device tree, all changes to its state
1059 * should be made using this routine. The state should _not_ be set directly.
1061 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1062 * Otherwise udev->state is set to new_state, and if new_state is
1063 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1064 * to USB_STATE_NOTATTACHED.
1066 void usb_set_device_state(struct usb_device
*udev
,
1067 enum usb_device_state new_state
)
1069 unsigned long flags
;
1071 spin_lock_irqsave(&device_state_lock
, flags
);
1072 if (udev
->state
== USB_STATE_NOTATTACHED
)
1074 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1076 /* root hub wakeup capabilities are managed out-of-band
1077 * and may involve silicon errata ... ignore them here.
1080 if (udev
->state
== USB_STATE_SUSPENDED
1081 || new_state
== USB_STATE_SUSPENDED
)
1082 ; /* No change to wakeup settings */
1083 else if (new_state
== USB_STATE_CONFIGURED
)
1084 device_init_wakeup(&udev
->dev
,
1085 (udev
->actconfig
->desc
.bmAttributes
1086 & USB_CONFIG_ATT_WAKEUP
));
1088 device_init_wakeup(&udev
->dev
, 0);
1090 udev
->state
= new_state
;
1092 recursively_mark_NOTATTACHED(udev
);
1093 spin_unlock_irqrestore(&device_state_lock
, flags
);
1100 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1101 * @rhdev: struct usb_device for the root hub
1103 * The USB host controller driver calls this function when its root hub
1104 * is resumed and Vbus power has been interrupted or the controller
1105 * has been reset. The routine marks all the children of the root hub
1106 * as NOTATTACHED and marks logical connect-change events on their ports.
1108 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
1110 struct usb_hub
*hub
;
1112 unsigned long flags
;
1114 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
1116 /* Make sure no potential wakeup events get lost,
1117 * by forcing the root hub to be resumed.
1119 rhdev
->dev
.power
.prev_state
.event
= PM_EVENT_ON
;
1121 spin_lock_irqsave(&device_state_lock
, flags
);
1122 hub
= hdev_to_hub(rhdev
);
1123 for (port1
= 1; port1
<= rhdev
->maxchild
; ++port1
) {
1124 if (rhdev
->children
[port1
- 1]) {
1125 recursively_mark_NOTATTACHED(
1126 rhdev
->children
[port1
- 1]);
1127 set_bit(port1
, hub
->change_bits
);
1130 spin_unlock_irqrestore(&device_state_lock
, flags
);
1132 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
1134 #endif /* CONFIG_PM */
1136 static void choose_address(struct usb_device
*udev
)
1139 struct usb_bus
*bus
= udev
->bus
;
1141 /* If khubd ever becomes multithreaded, this will need a lock */
1143 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1144 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1147 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1149 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1152 set_bit(devnum
, bus
->devmap
.devicemap
);
1153 udev
->devnum
= devnum
;
1157 static void release_address(struct usb_device
*udev
)
1159 if (udev
->devnum
> 0) {
1160 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1166 * usb_disconnect - disconnect a device (usbcore-internal)
1167 * @pdev: pointer to device being disconnected
1168 * Context: !in_interrupt ()
1170 * Something got disconnected. Get rid of it and all of its children.
1172 * If *pdev is a normal device then the parent hub must already be locked.
1173 * If *pdev is a root hub then this routine will acquire the
1174 * usb_bus_list_lock on behalf of the caller.
1176 * Only hub drivers (including virtual root hub drivers for host
1177 * controllers) should ever call this.
1179 * This call is synchronous, and may not be used in an interrupt context.
1181 void usb_disconnect(struct usb_device
**pdev
)
1183 struct usb_device
*udev
= *pdev
;
1187 pr_debug ("%s nodev\n", __FUNCTION__
);
1191 /* mark the device as inactive, so any further urb submissions for
1192 * this device (and any of its children) will fail immediately.
1193 * this quiesces everyting except pending urbs.
1195 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1196 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1198 usb_lock_device(udev
);
1200 /* Free up all the children before we remove this device */
1201 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1202 if (udev
->children
[i
])
1203 usb_disconnect(&udev
->children
[i
]);
1206 /* deallocate hcd/hardware state ... nuking all pending urbs and
1207 * cleaning up all state associated with the current configuration
1208 * so that the hardware is now fully quiesced.
1210 dev_dbg (&udev
->dev
, "unregistering device\n");
1211 usb_disable_device(udev
, 0);
1213 usb_unlock_device(udev
);
1215 /* Unregister the device. The device driver is responsible
1216 * for removing the device files from usbfs and sysfs and for
1217 * de-configuring the device.
1219 device_del(&udev
->dev
);
1221 /* Free the device number and delete the parent's children[]
1222 * (or root_hub) pointer.
1224 release_address(udev
);
1226 /* Avoid races with recursively_mark_NOTATTACHED() */
1227 spin_lock_irq(&device_state_lock
);
1229 spin_unlock_irq(&device_state_lock
);
1231 put_device(&udev
->dev
);
1235 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1239 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1243 static inline void show_string(struct usb_device
*udev
, char *id
, char *string
)
1248 #ifdef CONFIG_USB_OTG
1249 #include "otg_whitelist.h"
1250 static int __usb_port_suspend(struct usb_device
*, int port1
);
1253 static int __usb_new_device(void *void_data
)
1255 struct usb_device
*udev
= void_data
;
1258 /* Lock ourself into memory in order to keep a probe sequence
1259 * sleeping in a new thread from allowing us to be unloaded.
1261 if (!try_module_get(THIS_MODULE
))
1264 err
= usb_get_configuration(udev
);
1266 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1271 /* read the standard strings and cache them if present */
1272 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1273 udev
->manufacturer
= usb_cache_string(udev
,
1274 udev
->descriptor
.iManufacturer
);
1275 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1277 /* Tell the world! */
1278 dev_dbg(&udev
->dev
, "new device strings: Mfr=%d, Product=%d, "
1279 "SerialNumber=%d\n",
1280 udev
->descriptor
.iManufacturer
,
1281 udev
->descriptor
.iProduct
,
1282 udev
->descriptor
.iSerialNumber
);
1283 show_string(udev
, "Product", udev
->product
);
1284 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1285 show_string(udev
, "SerialNumber", udev
->serial
);
1287 #ifdef CONFIG_USB_OTG
1289 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1290 * to wake us after we've powered off VBUS; and HNP, switching roles
1291 * "host" to "peripheral". The OTG descriptor helps figure this out.
1293 if (!udev
->bus
->is_b_host
1295 && udev
->parent
== udev
->bus
->root_hub
) {
1296 struct usb_otg_descriptor
*desc
= 0;
1297 struct usb_bus
*bus
= udev
->bus
;
1299 /* descriptor may appear anywhere in config */
1300 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1301 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1302 USB_DT_OTG
, (void **) &desc
) == 0) {
1303 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1304 unsigned port1
= udev
->portnum
;
1306 dev_info(&udev
->dev
,
1307 "Dual-Role OTG device on %sHNP port\n",
1308 (port1
== bus
->otg_port
)
1311 /* enable HNP before suspend, it's simpler */
1312 if (port1
== bus
->otg_port
)
1313 bus
->b_hnp_enable
= 1;
1314 err
= usb_control_msg(udev
,
1315 usb_sndctrlpipe(udev
, 0),
1316 USB_REQ_SET_FEATURE
, 0,
1318 ? USB_DEVICE_B_HNP_ENABLE
1319 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1320 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1322 /* OTG MESSAGE: report errors here,
1323 * customize to match your product.
1325 dev_info(&udev
->dev
,
1326 "can't set HNP mode; %d\n",
1328 bus
->b_hnp_enable
= 0;
1334 if (!is_targeted(udev
)) {
1336 /* Maybe it can talk to us, though we can't talk to it.
1337 * (Includes HNP test device.)
1339 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1340 err
= __usb_port_suspend(udev
, udev
->bus
->otg_port
);
1342 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1349 /* Register the device. The device driver is responsible
1350 * for adding the device files to usbfs and sysfs and for
1351 * configuring the device.
1353 err
= device_add (&udev
->dev
);
1355 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1360 module_put(THIS_MODULE
);
1364 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1369 * usb_new_device - perform initial device setup (usbcore-internal)
1370 * @udev: newly addressed device (in ADDRESS state)
1372 * This is called with devices which have been enumerated, but not yet
1373 * configured. The device descriptor is available, but not descriptors
1374 * for any device configuration. The caller must have locked either
1375 * the parent hub (if udev is a normal device) or else the
1376 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1377 * udev has already been installed, but udev is not yet visible through
1378 * sysfs or other filesystem code.
1380 * The return value for this function depends on if the
1381 * multithread_probe variable is set or not. If it's set, it will
1382 * return a if the probe thread was successfully created or not. If the
1383 * variable is not set, it will return if the device is configured
1384 * properly or not. interfaces, in sysfs); else a negative errno value.
1386 * This call is synchronous, and may not be used in an interrupt context.
1388 * Only the hub driver or root-hub registrar should ever call this.
1390 int usb_new_device(struct usb_device
*udev
)
1392 struct task_struct
*probe_task
;
1395 if (multithread_probe
) {
1396 probe_task
= kthread_run(__usb_new_device
, udev
,
1397 "usb-probe-%s", udev
->devnum
);
1398 if (IS_ERR(probe_task
))
1399 ret
= PTR_ERR(probe_task
);
1401 ret
= __usb_new_device(udev
);
1406 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1407 u16
*status
, u16
*change
)
1411 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1413 dev_err (hub
->intfdev
,
1414 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1416 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1417 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1424 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1425 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1427 struct usb_hcd
*hcd
;
1428 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1430 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1431 return hcd
->wireless
;
1435 #define PORT_RESET_TRIES 5
1436 #define SET_ADDRESS_TRIES 2
1437 #define GET_DESCRIPTOR_TRIES 2
1438 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1439 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1441 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1442 #define HUB_SHORT_RESET_TIME 10
1443 #define HUB_LONG_RESET_TIME 200
1444 #define HUB_RESET_TIMEOUT 500
1446 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1447 struct usb_device
*udev
, unsigned int delay
)
1449 int delay_time
, ret
;
1453 for (delay_time
= 0;
1454 delay_time
< HUB_RESET_TIMEOUT
;
1455 delay_time
+= delay
) {
1456 /* wait to give the device a chance to reset */
1459 /* read and decode port status */
1460 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1464 /* Device went away? */
1465 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1468 /* bomb out completely if something weird happened */
1469 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1472 /* if we`ve finished resetting, then break out of the loop */
1473 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1474 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1475 if (hub_is_wusb(hub
))
1476 udev
->speed
= USB_SPEED_VARIABLE
;
1477 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1478 udev
->speed
= USB_SPEED_HIGH
;
1479 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1480 udev
->speed
= USB_SPEED_LOW
;
1482 udev
->speed
= USB_SPEED_FULL
;
1486 /* switch to the long delay after two short delay failures */
1487 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1488 delay
= HUB_LONG_RESET_TIME
;
1490 dev_dbg (hub
->intfdev
,
1491 "port %d not reset yet, waiting %dms\n",
1498 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1499 struct usb_device
*udev
, unsigned int delay
)
1503 /* Reset the port */
1504 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1505 status
= set_port_feature(hub
->hdev
,
1506 port1
, USB_PORT_FEAT_RESET
);
1508 dev_err(hub
->intfdev
,
1509 "cannot reset port %d (err = %d)\n",
1512 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1513 if (status
&& status
!= -ENOTCONN
)
1514 dev_dbg(hub
->intfdev
,
1515 "port_wait_reset: err = %d\n",
1519 /* return on disconnect or reset */
1522 /* TRSTRCY = 10 ms; plus some extra */
1527 clear_port_feature(hub
->hdev
,
1528 port1
, USB_PORT_FEAT_C_RESET
);
1529 /* FIXME need disconnect() for NOTATTACHED device */
1530 usb_set_device_state(udev
, status
1531 ? USB_STATE_NOTATTACHED
1532 : USB_STATE_DEFAULT
);
1536 dev_dbg (hub
->intfdev
,
1537 "port %d not enabled, trying reset again...\n",
1539 delay
= HUB_LONG_RESET_TIME
;
1542 dev_err (hub
->intfdev
,
1543 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1550 * Disable a port and mark a logical connnect-change event, so that some
1551 * time later khubd will disconnect() any existing usb_device on the port
1552 * and will re-enumerate if there actually is a device attached.
1554 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
1556 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
1557 hub_port_disable(hub
, port1
, 1);
1559 /* FIXME let caller ask to power down the port:
1560 * - some devices won't enumerate without a VBUS power cycle
1561 * - SRP saves power that way
1562 * - ... new call, TBD ...
1563 * That's easy if this hub can switch power per-port, and
1564 * khubd reactivates the port later (timer, SRP, etc).
1565 * Powerdown must be optional, because of reset/DFU.
1568 set_bit(port1
, hub
->change_bits
);
1574 #ifdef CONFIG_USB_SUSPEND
1577 * Selective port suspend reduces power; most suspended devices draw
1578 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1579 * All devices below the suspended port are also suspended.
1581 * Devices leave suspend state when the host wakes them up. Some devices
1582 * also support "remote wakeup", where the device can activate the USB
1583 * tree above them to deliver data, such as a keypress or packet. In
1584 * some cases, this wakes the USB host.
1586 static int hub_port_suspend(struct usb_hub
*hub
, int port1
,
1587 struct usb_device
*udev
)
1591 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1593 /* enable remote wakeup when appropriate; this lets the device
1594 * wake up the upstream hub (including maybe the root hub).
1596 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1597 * we don't explicitly enable it here.
1599 if (udev
->do_remote_wakeup
) {
1600 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1601 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1602 USB_DEVICE_REMOTE_WAKEUP
, 0,
1604 USB_CTRL_SET_TIMEOUT
);
1607 "won't remote wakeup, status %d\n",
1612 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1614 dev_dbg(hub
->intfdev
,
1615 "can't suspend port %d, status %d\n",
1617 /* paranoia: "should not happen" */
1618 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1619 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1620 USB_DEVICE_REMOTE_WAKEUP
, 0,
1622 USB_CTRL_SET_TIMEOUT
);
1624 /* device has up to 10 msec to fully suspend */
1625 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1626 udev
->auto_pm
? "auto-" : "");
1627 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1634 * Devices on USB hub ports have only one "suspend" state, corresponding
1635 * to ACPI D2, "may cause the device to lose some context".
1636 * State transitions include:
1638 * - suspend, resume ... when the VBUS power link stays live
1639 * - suspend, disconnect ... VBUS lost
1641 * Once VBUS drop breaks the circuit, the port it's using has to go through
1642 * normal re-enumeration procedures, starting with enabling VBUS power.
1643 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1644 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1645 * timer, no SRP, no requests through sysfs.
1647 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1648 * the root hub for their bus goes into global suspend ... so we don't
1649 * (falsely) update the device power state to say it suspended.
1651 static int __usb_port_suspend (struct usb_device
*udev
, int port1
)
1655 /* caller owns the udev device lock */
1659 /* we change the device's upstream USB link,
1660 * but root hubs have no upstream USB link.
1663 status
= hub_port_suspend(hdev_to_hub(udev
->parent
), port1
,
1666 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1667 udev
->auto_pm
? "auto-" : "");
1668 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1674 * usb_port_suspend - suspend a usb device's upstream port
1675 * @udev: device that's no longer in active use
1676 * Context: must be able to sleep; device not locked; pm locks held
1678 * Suspends a USB device that isn't in active use, conserving power.
1679 * Devices may wake out of a suspend, if anything important happens,
1680 * using the remote wakeup mechanism. They may also be taken out of
1681 * suspend by the host, using usb_port_resume(). It's also routine
1682 * to disconnect devices while they are suspended.
1684 * This only affects the USB hardware for a device; its interfaces
1685 * (and, for hubs, child devices) must already have been suspended.
1687 * Suspending OTG devices may trigger HNP, if that's been enabled
1688 * between a pair of dual-role devices. That will change roles, such
1689 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1691 * Returns 0 on success, else negative errno.
1693 int usb_port_suspend(struct usb_device
*udev
)
1695 return __usb_port_suspend(udev
, udev
->portnum
);
1699 * If the USB "suspend" state is in use (rather than "global suspend"),
1700 * many devices will be individually taken out of suspend state using
1701 * special" resume" signaling. These routines kick in shortly after
1702 * hardware resume signaling is finished, either because of selective
1703 * resume (by host) or remote wakeup (by device) ... now see what changed
1704 * in the tree that's rooted at this device.
1706 static int finish_port_resume(struct usb_device
*udev
)
1711 /* caller owns the udev device lock */
1712 dev_dbg(&udev
->dev
, "finish resume\n");
1714 /* usb ch9 identifies four variants of SUSPENDED, based on what
1715 * state the device resumes to. Linux currently won't see the
1716 * first two on the host side; they'd be inside hub_port_init()
1717 * during many timeouts, but khubd can't suspend until later.
1719 usb_set_device_state(udev
, udev
->actconfig
1720 ? USB_STATE_CONFIGURED
1721 : USB_STATE_ADDRESS
);
1723 /* 10.5.4.5 says be sure devices in the tree are still there.
1724 * For now let's assume the device didn't go crazy on resume,
1725 * and device drivers will know about any resume quirks.
1727 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1729 status
= (status
== 2 ? 0 : -ENODEV
);
1733 "gone after usb resume? status %d\n",
1735 else if (udev
->actconfig
) {
1736 le16_to_cpus(&devstatus
);
1737 if ((devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
1739 status
= usb_control_msg(udev
,
1740 usb_sndctrlpipe(udev
, 0),
1741 USB_REQ_CLEAR_FEATURE
,
1743 USB_DEVICE_REMOTE_WAKEUP
, 0,
1745 USB_CTRL_SET_TIMEOUT
);
1747 dev_dbg(&udev
->dev
, "disable remote "
1748 "wakeup, status %d\n", status
);
1752 } else if (udev
->devnum
<= 0) {
1753 dev_dbg(&udev
->dev
, "bogus resume!\n");
1760 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1764 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1766 set_bit(port1
, hub
->busy_bits
);
1768 /* see 7.1.7.7; affects power usage, but not budgeting */
1769 status
= clear_port_feature(hub
->hdev
,
1770 port1
, USB_PORT_FEAT_SUSPEND
);
1772 dev_dbg(hub
->intfdev
,
1773 "can't resume port %d, status %d\n",
1779 /* drive resume for at least 20 msec */
1781 dev_dbg(&udev
->dev
, "usb %sresume\n",
1782 udev
->auto_pm
? "auto-" : "");
1785 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1786 | USB_PORT_STAT_ENABLE \
1787 | USB_PORT_STAT_CONNECTION)
1789 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1790 * stop resume signaling. Then finish the resume
1793 devstatus
= portchange
= 0;
1794 status
= hub_port_status(hub
, port1
,
1795 &devstatus
, &portchange
);
1797 || (devstatus
& LIVE_FLAGS
) != LIVE_FLAGS
1798 || (devstatus
& USB_PORT_STAT_SUSPEND
) != 0
1800 dev_dbg(hub
->intfdev
,
1801 "port %d status %04x.%04x after resume, %d\n",
1802 port1
, portchange
, devstatus
, status
);
1806 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1807 clear_port_feature(hub
->hdev
, port1
,
1808 USB_PORT_FEAT_C_SUSPEND
);
1809 /* TRSMRCY = 10 msec */
1812 status
= finish_port_resume(udev
);
1816 hub_port_logical_disconnect(hub
, port1
);
1818 clear_bit(port1
, hub
->busy_bits
);
1819 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
1820 usb_enable_root_hub_irq(hub
->hdev
->bus
);
1826 * usb_port_resume - re-activate a suspended usb device's upstream port
1827 * @udev: device to re-activate
1828 * Context: must be able to sleep; device not locked; pm locks held
1830 * This will re-activate the suspended device, increasing power usage
1831 * while letting drivers communicate again with its endpoints.
1832 * USB resume explicitly guarantees that the power session between
1833 * the host and the device is the same as it was when the device
1836 * Returns 0 on success, else negative errno.
1838 int usb_port_resume(struct usb_device
*udev
)
1842 /* we change the device's upstream USB link,
1843 * but root hubs have no upstream USB link.
1846 // NOTE this fails if parent is also suspended...
1847 status
= hub_port_resume(hdev_to_hub(udev
->parent
),
1848 udev
->portnum
, udev
);
1850 dev_dbg(&udev
->dev
, "usb %sresume\n",
1851 udev
->auto_pm
? "auto-" : "");
1852 status
= finish_port_resume(udev
);
1855 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
1859 static int remote_wakeup(struct usb_device
*udev
)
1863 /* All this just to avoid sending a port-resume message
1864 * to the parent hub! */
1866 usb_lock_device(udev
);
1868 if (udev
->state
== USB_STATE_SUSPENDED
) {
1869 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
1870 /* TRSMRCY = 10 msec */
1872 status
= finish_port_resume(udev
);
1874 udev
->dev
.power
.power_state
.event
= PM_EVENT_ON
;
1876 usb_pm_unlock(udev
);
1879 usb_autoresume_device(udev
, 0);
1880 usb_unlock_device(udev
);
1884 #else /* CONFIG_USB_SUSPEND */
1886 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1888 int usb_port_suspend(struct usb_device
*udev
)
1894 finish_port_resume(struct usb_device
*udev
)
1900 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1905 int usb_port_resume(struct usb_device
*udev
)
1910 static inline int remote_wakeup(struct usb_device
*udev
)
1917 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1919 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1920 struct usb_device
*hdev
= hub
->hdev
;
1923 /* fail if children aren't already suspended */
1924 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1925 struct usb_device
*udev
;
1927 udev
= hdev
->children
[port1
-1];
1928 if (udev
&& msg
.event
== PM_EVENT_SUSPEND
&&
1929 #ifdef CONFIG_USB_SUSPEND
1930 udev
->state
!= USB_STATE_SUSPENDED
1932 udev
->dev
.power
.power_state
.event
1937 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
1943 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1945 /* "global suspend" of the downstream HC-to-USB interface */
1946 if (!hdev
->parent
) {
1947 struct usb_bus
*bus
= hdev
->bus
;
1949 int status
= hcd_bus_suspend (bus
);
1952 dev_dbg(&hdev
->dev
, "'global' suspend %d\n",
1960 /* stop khubd and related activity */
1965 static int hub_resume(struct usb_interface
*intf
)
1967 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1968 struct usb_device
*hdev
= hub
->hdev
;
1971 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1973 /* "global resume" of the downstream HC-to-USB interface */
1974 if (!hdev
->parent
) {
1975 struct usb_bus
*bus
= hdev
->bus
;
1977 status
= hcd_bus_resume (bus
);
1979 dev_dbg(&intf
->dev
, "'global' resume %d\n",
1986 /* TRSMRCY = 10 msec */
1991 /* tell khubd to look for changes on this hub */
1996 #else /* CONFIG_PM */
1998 static inline int remote_wakeup(struct usb_device
*udev
)
2003 #define hub_suspend NULL
2004 #define hub_resume NULL
2007 void usb_resume_root_hub(struct usb_device
*hdev
)
2009 struct usb_hub
*hub
= hdev_to_hub(hdev
);
2015 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2017 * Between connect detection and reset signaling there must be a delay
2018 * of 100ms at least for debounce and power-settling. The corresponding
2019 * timer shall restart whenever the downstream port detects a disconnect.
2021 * Apparently there are some bluetooth and irda-dongles and a number of
2022 * low-speed devices for which this debounce period may last over a second.
2023 * Not covered by the spec - but easy to deal with.
2025 * This implementation uses a 1500ms total debounce timeout; if the
2026 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2027 * every 25ms for transient disconnects. When the port status has been
2028 * unchanged for 100ms it returns the port status.
2031 #define HUB_DEBOUNCE_TIMEOUT 1500
2032 #define HUB_DEBOUNCE_STEP 25
2033 #define HUB_DEBOUNCE_STABLE 100
2035 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2038 int total_time
, stable_time
= 0;
2039 u16 portchange
, portstatus
;
2040 unsigned connection
= 0xffff;
2042 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2043 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2047 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2048 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2049 stable_time
+= HUB_DEBOUNCE_STEP
;
2050 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2054 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2057 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2058 clear_port_feature(hub
->hdev
, port1
,
2059 USB_PORT_FEAT_C_CONNECTION
);
2062 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2064 msleep(HUB_DEBOUNCE_STEP
);
2067 dev_dbg (hub
->intfdev
,
2068 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2069 port1
, total_time
, stable_time
, portstatus
);
2071 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2076 static void ep0_reinit(struct usb_device
*udev
)
2078 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2079 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2080 udev
->ep_in
[0] = udev
->ep_out
[0] = &udev
->ep0
;
2083 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2084 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2086 static int hub_set_address(struct usb_device
*udev
)
2090 if (udev
->devnum
== 0)
2092 if (udev
->state
== USB_STATE_ADDRESS
)
2094 if (udev
->state
!= USB_STATE_DEFAULT
)
2096 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2097 USB_REQ_SET_ADDRESS
, 0, udev
->devnum
, 0,
2098 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2100 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2106 /* Reset device, (re)assign address, get device descriptor.
2107 * Device connection must be stable, no more debouncing needed.
2108 * Returns device in USB_STATE_ADDRESS, except on error.
2110 * If this is called for an already-existing device (as part of
2111 * usb_reset_device), the caller must own the device lock. For a
2112 * newly detected device that is not accessible through any global
2113 * pointers, it's not necessary to lock the device.
2116 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2119 static DEFINE_MUTEX(usb_address0_mutex
);
2121 struct usb_device
*hdev
= hub
->hdev
;
2123 unsigned delay
= HUB_SHORT_RESET_TIME
;
2124 enum usb_device_speed oldspeed
= udev
->speed
;
2127 /* root hub ports have a slightly longer reset period
2128 * (from USB 2.0 spec, section 7.1.7.5)
2130 if (!hdev
->parent
) {
2131 delay
= HUB_ROOT_RESET_TIME
;
2132 if (port1
== hdev
->bus
->otg_port
)
2133 hdev
->bus
->b_hnp_enable
= 0;
2136 /* Some low speed devices have problems with the quick delay, so */
2137 /* be a bit pessimistic with those devices. RHbug #23670 */
2138 if (oldspeed
== USB_SPEED_LOW
)
2139 delay
= HUB_LONG_RESET_TIME
;
2141 mutex_lock(&usb_address0_mutex
);
2143 /* Reset the device; full speed may morph to high speed */
2144 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2145 if (retval
< 0) /* error or disconnect */
2147 /* success, speed is known */
2150 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2151 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2154 oldspeed
= udev
->speed
;
2156 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2157 * it's fixed size except for full speed devices.
2158 * For Wireless USB devices, ep0 max packet is always 512 (tho
2159 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2161 switch (udev
->speed
) {
2162 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2163 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2165 case USB_SPEED_HIGH
: /* fixed at 64 */
2166 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2168 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2169 /* to determine the ep0 maxpacket size, try to read
2170 * the device descriptor to get bMaxPacketSize0 and
2171 * then correct our initial guess.
2173 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2175 case USB_SPEED_LOW
: /* fixed at 8 */
2176 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2183 switch (udev
->speed
) {
2184 case USB_SPEED_LOW
: speed
= "low"; break;
2185 case USB_SPEED_FULL
: speed
= "full"; break;
2186 case USB_SPEED_HIGH
: speed
= "high"; break;
2187 case USB_SPEED_VARIABLE
:
2191 default: speed
= "?"; break;
2193 dev_info (&udev
->dev
,
2194 "%s %s speed %sUSB device using %s and address %d\n",
2195 (udev
->config
) ? "reset" : "new", speed
, type
,
2196 udev
->bus
->controller
->driver
->name
, udev
->devnum
);
2198 /* Set up TT records, if needed */
2200 udev
->tt
= hdev
->tt
;
2201 udev
->ttport
= hdev
->ttport
;
2202 } else if (udev
->speed
!= USB_SPEED_HIGH
2203 && hdev
->speed
== USB_SPEED_HIGH
) {
2204 udev
->tt
= &hub
->tt
;
2205 udev
->ttport
= port1
;
2208 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2209 * Because device hardware and firmware is sometimes buggy in
2210 * this area, and this is how Linux has done it for ages.
2211 * Change it cautiously.
2213 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2214 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2215 * so it may help with some non-standards-compliant devices.
2216 * Otherwise we start with SET_ADDRESS and then try to read the
2217 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2220 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2221 if (USE_NEW_SCHEME(retry_counter
)) {
2222 struct usb_device_descriptor
*buf
;
2225 #define GET_DESCRIPTOR_BUFSIZE 64
2226 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2232 /* Use a short timeout the first time through,
2233 * so that recalcitrant full-speed devices with
2234 * 8- or 16-byte ep0-maxpackets won't slow things
2235 * down tremendously by NAKing the unexpectedly
2236 * early status stage. Also, retry on all errors;
2237 * some devices are flakey.
2238 * 255 is for WUSB devices, we actually need to use 512.
2241 for (j
= 0; j
< 3; ++j
) {
2242 buf
->bMaxPacketSize0
= 0;
2243 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2244 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2245 USB_DT_DEVICE
<< 8, 0,
2246 buf
, GET_DESCRIPTOR_BUFSIZE
,
2247 (i
? USB_CTRL_GET_TIMEOUT
: 1000));
2248 switch (buf
->bMaxPacketSize0
) {
2249 case 8: case 16: case 32: case 64: case 255:
2250 if (buf
->bDescriptorType
==
2264 udev
->descriptor
.bMaxPacketSize0
=
2265 buf
->bMaxPacketSize0
;
2268 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2269 if (retval
< 0) /* error or disconnect */
2271 if (oldspeed
!= udev
->speed
) {
2273 "device reset changed speed!\n");
2278 dev_err(&udev
->dev
, "device descriptor "
2279 "read/%s, error %d\n",
2284 #undef GET_DESCRIPTOR_BUFSIZE
2287 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2288 retval
= hub_set_address(udev
);
2295 "device not accepting address %d, error %d\n",
2296 udev
->devnum
, retval
);
2300 /* cope with hardware quirkiness:
2301 * - let SET_ADDRESS settle, some device hardware wants it
2302 * - read ep0 maxpacket even for high and low speed,
2305 if (USE_NEW_SCHEME(retry_counter
))
2308 retval
= usb_get_device_descriptor(udev
, 8);
2310 dev_err(&udev
->dev
, "device descriptor "
2311 "read/%s, error %d\n",
2323 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2324 512 : udev
->descriptor
.bMaxPacketSize0
;
2325 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2326 if (udev
->speed
!= USB_SPEED_FULL
||
2327 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2328 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2332 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2333 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2337 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2338 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2339 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2350 hub_port_disable(hub
, port1
, 0);
2351 mutex_unlock(&usb_address0_mutex
);
2356 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2358 struct usb_qualifier_descriptor
*qual
;
2361 qual
= kmalloc (sizeof *qual
, SLAB_KERNEL
);
2365 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2366 qual
, sizeof *qual
);
2367 if (status
== sizeof *qual
) {
2368 dev_info(&udev
->dev
, "not running at top speed; "
2369 "connect to a high speed hub\n");
2370 /* hub LEDs are probably harder to miss than syslog */
2371 if (hub
->has_indicators
) {
2372 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2373 schedule_work (&hub
->leds
);
2380 hub_power_remaining (struct usb_hub
*hub
)
2382 struct usb_device
*hdev
= hub
->hdev
;
2386 if (!hub
->limited_power
)
2389 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2390 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2391 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2397 /* Unconfigured devices may not use more than 100mA,
2398 * or 8mA for OTG ports */
2399 if (udev
->actconfig
)
2400 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2401 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2405 if (delta
> hub
->mA_per_port
)
2406 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2408 delta
, hub
->mA_per_port
, port1
);
2411 if (remaining
< 0) {
2412 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2419 /* Handle physical or logical connection change events.
2420 * This routine is called when:
2421 * a port connection-change occurs;
2422 * a port enable-change occurs (often caused by EMI);
2423 * usb_reset_device() encounters changed descriptors (as from
2424 * a firmware download)
2425 * caller already locked the hub
2427 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2428 u16 portstatus
, u16 portchange
)
2430 struct usb_device
*hdev
= hub
->hdev
;
2431 struct device
*hub_dev
= hub
->intfdev
;
2432 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2436 "port %d, status %04x, change %04x, %s\n",
2437 port1
, portstatus
, portchange
, portspeed (portstatus
));
2439 if (hub
->has_indicators
) {
2440 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2441 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2444 /* Disconnect any existing devices under this port */
2445 if (hdev
->children
[port1
-1])
2446 usb_disconnect(&hdev
->children
[port1
-1]);
2447 clear_bit(port1
, hub
->change_bits
);
2449 #ifdef CONFIG_USB_OTG
2450 /* during HNP, don't repeat the debounce */
2451 if (hdev
->bus
->is_b_host
)
2452 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2455 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2456 status
= hub_port_debounce(hub
, port1
);
2459 "connect-debounce failed, port %d disabled\n",
2463 portstatus
= status
;
2466 /* Return now if nothing is connected */
2467 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2469 /* maybe switch power back on (e.g. root hub was reset) */
2470 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2471 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2472 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2474 if (portstatus
& USB_PORT_STAT_ENABLE
)
2479 #ifdef CONFIG_USB_SUSPEND
2480 /* If something is connected, but the port is suspended, wake it up. */
2481 if (portstatus
& USB_PORT_STAT_SUSPEND
) {
2482 status
= hub_port_resume(hub
, port1
, NULL
);
2485 "can't clear suspend on port %d; %d\n",
2492 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2493 struct usb_device
*udev
;
2495 /* reallocate for each attempt, since references
2496 * to the previous one can escape in various ways
2498 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2501 "couldn't allocate port %d usb_device\n",
2506 usb_set_device_state(udev
, USB_STATE_POWERED
);
2507 udev
->speed
= USB_SPEED_UNKNOWN
;
2508 udev
->bus_mA
= hub
->mA_per_port
;
2509 udev
->level
= hdev
->level
+ 1;
2511 /* set the address */
2512 choose_address(udev
);
2513 if (udev
->devnum
<= 0) {
2514 status
= -ENOTCONN
; /* Don't retry */
2518 /* reset and get descriptor */
2519 status
= hub_port_init(hub
, udev
, port1
, i
);
2523 /* consecutive bus-powered hubs aren't reliable; they can
2524 * violate the voltage drop budget. if the new child has
2525 * a "powered" LED, users should notice we didn't enable it
2526 * (without reading syslog), even without per-port LEDs
2529 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2530 && udev
->bus_mA
<= 100) {
2533 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2536 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2539 le16_to_cpus(&devstat
);
2540 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2542 "can't connect bus-powered hub "
2544 if (hub
->has_indicators
) {
2545 hub
->indicator
[port1
-1] =
2546 INDICATOR_AMBER_BLINK
;
2547 schedule_work (&hub
->leds
);
2549 status
= -ENOTCONN
; /* Don't retry */
2554 /* check for devices running slower than they could */
2555 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2556 && udev
->speed
== USB_SPEED_FULL
2557 && highspeed_hubs
!= 0)
2558 check_highspeed (hub
, udev
, port1
);
2560 /* Store the parent's children[] pointer. At this point
2561 * udev becomes globally accessible, although presumably
2562 * no one will look at it until hdev is unlocked.
2566 /* We mustn't add new devices if the parent hub has
2567 * been disconnected; we would race with the
2568 * recursively_mark_NOTATTACHED() routine.
2570 spin_lock_irq(&device_state_lock
);
2571 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2574 hdev
->children
[port1
-1] = udev
;
2575 spin_unlock_irq(&device_state_lock
);
2577 /* Run it through the hoops (find a driver, etc) */
2579 status
= usb_new_device(udev
);
2581 spin_lock_irq(&device_state_lock
);
2582 hdev
->children
[port1
-1] = NULL
;
2583 spin_unlock_irq(&device_state_lock
);
2590 status
= hub_power_remaining(hub
);
2592 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2597 hub_port_disable(hub
, port1
, 1);
2600 release_address(udev
);
2602 if (status
== -ENOTCONN
)
2607 hub_port_disable(hub
, port1
, 1);
2610 static void hub_events(void)
2612 struct list_head
*tmp
;
2613 struct usb_device
*hdev
;
2614 struct usb_interface
*intf
;
2615 struct usb_hub
*hub
;
2616 struct device
*hub_dev
;
2625 * We restart the list every time to avoid a deadlock with
2626 * deleting hubs downstream from this one. This should be
2627 * safe since we delete the hub from the event list.
2628 * Not the most efficient, but avoids deadlocks.
2632 /* Grab the first entry at the beginning of the list */
2633 spin_lock_irq(&hub_event_lock
);
2634 if (list_empty(&hub_event_list
)) {
2635 spin_unlock_irq(&hub_event_lock
);
2639 tmp
= hub_event_list
.next
;
2642 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2644 intf
= to_usb_interface(hub
->intfdev
);
2645 hub_dev
= &intf
->dev
;
2647 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2648 hdev
->state
, hub
->descriptor
2649 ? hub
->descriptor
->bNbrPorts
2651 /* NOTE: expects max 15 ports... */
2652 (u16
) hub
->change_bits
[0],
2653 (u16
) hub
->event_bits
[0]);
2656 spin_unlock_irq(&hub_event_lock
);
2658 /* Lock the device, then check to see if we were
2659 * disconnected while waiting for the lock to succeed. */
2660 if (locktree(hdev
) < 0) {
2664 if (hub
!= usb_get_intfdata(intf
))
2667 /* If the hub has died, clean up after it */
2668 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2669 hub
->error
= -ENODEV
;
2670 hub_pre_reset(intf
);
2675 ret
= usb_autopm_get_interface(intf
);
2677 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2681 /* If this is an inactive hub, do nothing */
2686 dev_dbg (hub_dev
, "resetting for error %d\n",
2689 ret
= usb_reset_composite_device(hdev
, intf
);
2692 "error resetting hub: %d\n", ret
);
2700 /* deal with port status changes */
2701 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2702 if (test_bit(i
, hub
->busy_bits
))
2704 connect_change
= test_bit(i
, hub
->change_bits
);
2705 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2706 !connect_change
&& !hub
->activating
)
2709 ret
= hub_port_status(hub
, i
,
2710 &portstatus
, &portchange
);
2714 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2716 USB_PORT_STAT_CONNECTION
))
2719 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2720 clear_port_feature(hdev
, i
,
2721 USB_PORT_FEAT_C_CONNECTION
);
2725 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2726 if (!connect_change
)
2728 "port %d enable change, "
2731 clear_port_feature(hdev
, i
,
2732 USB_PORT_FEAT_C_ENABLE
);
2735 * EM interference sometimes causes badly
2736 * shielded USB devices to be shutdown by
2737 * the hub, this hack enables them again.
2738 * Works at least with mouse driver.
2740 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2742 && hdev
->children
[i
-1]) {
2745 "disabled by hub (EMI?), "
2752 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2753 clear_port_feature(hdev
, i
,
2754 USB_PORT_FEAT_C_SUSPEND
);
2755 if (hdev
->children
[i
-1]) {
2756 ret
= remote_wakeup(hdev
->
2762 hub_port_disable(hub
, i
, 1);
2765 "resume on port %d, status %d\n",
2769 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2771 "over-current change on port %d\n",
2773 clear_port_feature(hdev
, i
,
2774 USB_PORT_FEAT_C_OVER_CURRENT
);
2778 if (portchange
& USB_PORT_STAT_C_RESET
) {
2780 "reset change on port %d\n",
2782 clear_port_feature(hdev
, i
,
2783 USB_PORT_FEAT_C_RESET
);
2787 hub_port_connect_change(hub
, i
,
2788 portstatus
, portchange
);
2791 /* deal with hub status changes */
2792 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2794 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2795 dev_err (hub_dev
, "get_hub_status failed\n");
2797 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2798 dev_dbg (hub_dev
, "power change\n");
2799 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2800 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2801 /* FIXME: Is this always true? */
2802 hub
->limited_power
= 0;
2804 hub
->limited_power
= 1;
2806 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2807 dev_dbg (hub_dev
, "overcurrent change\n");
2808 msleep(500); /* Cool down */
2809 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2814 hub
->activating
= 0;
2816 /* If this is a root hub, tell the HCD it's okay to
2817 * re-enable port-change interrupts now. */
2818 if (!hdev
->parent
&& !hub
->busy_bits
[0])
2819 usb_enable_root_hub_irq(hdev
->bus
);
2822 /* Allow autosuspend if we're not going to run again */
2823 if (list_empty(&hub
->event_list
))
2824 usb_autopm_enable(intf
);
2826 usb_unlock_device(hdev
);
2829 } /* end while (1) */
2832 static int hub_thread(void *__unused
)
2836 wait_event_interruptible(khubd_wait
,
2837 !list_empty(&hub_event_list
) ||
2838 kthread_should_stop());
2840 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2842 pr_debug("%s: khubd exiting\n", usbcore_name
);
2846 static struct usb_device_id hub_id_table
[] = {
2847 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2848 .bDeviceClass
= USB_CLASS_HUB
},
2849 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2850 .bInterfaceClass
= USB_CLASS_HUB
},
2851 { } /* Terminating entry */
2854 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2856 static struct usb_driver hub_driver
= {
2859 .disconnect
= hub_disconnect
,
2860 .suspend
= hub_suspend
,
2861 .resume
= hub_resume
,
2862 .pre_reset
= hub_pre_reset
,
2863 .post_reset
= hub_post_reset
,
2865 .id_table
= hub_id_table
,
2866 .supports_autosuspend
= 1,
2869 int usb_hub_init(void)
2871 if (usb_register(&hub_driver
) < 0) {
2872 printk(KERN_ERR
"%s: can't register hub driver\n",
2877 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2878 if (!IS_ERR(khubd_task
))
2881 /* Fall through if kernel_thread failed */
2882 usb_deregister(&hub_driver
);
2883 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2888 void usb_hub_cleanup(void)
2890 kthread_stop(khubd_task
);
2893 * Hub resources are freed for us by usb_deregister. It calls
2894 * usb_driver_purge on every device which in turn calls that
2895 * devices disconnect function if it is using this driver.
2896 * The hub_disconnect function takes care of releasing the
2897 * individual hub resources. -greg
2899 usb_deregister(&hub_driver
);
2900 } /* usb_hub_cleanup() */
2902 static int config_descriptors_changed(struct usb_device
*udev
)
2906 struct usb_config_descriptor
*buf
;
2908 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2909 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2910 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2912 buf
= kmalloc (len
, SLAB_KERNEL
);
2914 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2915 /* assume the worst */
2918 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2920 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2922 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
2924 if (length
< old_length
) {
2925 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
2929 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
2931 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
2932 index
, buf
->bConfigurationValue
);
2937 return index
!= udev
->descriptor
.bNumConfigurations
;
2941 * usb_reset_device - perform a USB port reset to reinitialize a device
2942 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2944 * WARNING - don't use this routine to reset a composite device
2945 * (one with multiple interfaces owned by separate drivers)!
2946 * Use usb_reset_composite_device() instead.
2948 * Do a port reset, reassign the device's address, and establish its
2949 * former operating configuration. If the reset fails, or the device's
2950 * descriptors change from their values before the reset, or the original
2951 * configuration and altsettings cannot be restored, a flag will be set
2952 * telling khubd to pretend the device has been disconnected and then
2953 * re-connected. All drivers will be unbound, and the device will be
2954 * re-enumerated and probed all over again.
2956 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2957 * flagged for logical disconnection, or some other negative error code
2958 * if the reset wasn't even attempted.
2960 * The caller must own the device lock. For example, it's safe to use
2961 * this from a driver probe() routine after downloading new firmware.
2962 * For calls that might not occur during probe(), drivers should lock
2963 * the device using usb_lock_device_for_reset().
2965 int usb_reset_device(struct usb_device
*udev
)
2967 struct usb_device
*parent_hdev
= udev
->parent
;
2968 struct usb_hub
*parent_hub
;
2969 struct usb_device_descriptor descriptor
= udev
->descriptor
;
2971 int port1
= udev
->portnum
;
2973 if (udev
->state
== USB_STATE_NOTATTACHED
||
2974 udev
->state
== USB_STATE_SUSPENDED
) {
2975 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
2981 /* this requires hcd-specific logic; see OHCI hc_restart() */
2982 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
2985 parent_hub
= hdev_to_hub(parent_hdev
);
2987 set_bit(port1
, parent_hub
->busy_bits
);
2988 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
2990 /* ep0 maxpacket size may change; let the HCD know about it.
2991 * Other endpoints will be handled by re-enumeration. */
2993 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
2997 clear_bit(port1
, parent_hub
->busy_bits
);
2998 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
2999 usb_enable_root_hub_irq(parent_hdev
->bus
);
3004 /* Device might have changed firmware (DFU or similar) */
3005 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
3006 || config_descriptors_changed (udev
)) {
3007 dev_info(&udev
->dev
, "device firmware changed\n");
3008 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3012 if (!udev
->actconfig
)
3015 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3016 USB_REQ_SET_CONFIGURATION
, 0,
3017 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3018 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3021 "can't restore configuration #%d (error=%d)\n",
3022 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3025 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3027 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3028 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3029 struct usb_interface_descriptor
*desc
;
3031 /* set_interface resets host side toggle even
3032 * for altsetting zero. the interface may have no driver.
3034 desc
= &intf
->cur_altsetting
->desc
;
3035 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3036 desc
->bAlternateSetting
);
3038 dev_err(&udev
->dev
, "failed to restore interface %d "
3039 "altsetting %d (error=%d)\n",
3040 desc
->bInterfaceNumber
,
3041 desc
->bAlternateSetting
,
3051 hub_port_logical_disconnect(parent_hub
, port1
);
3054 EXPORT_SYMBOL(usb_reset_device
);
3057 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3058 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3059 * @iface: interface bound to the driver making the request (optional)
3061 * Warns all drivers bound to registered interfaces (using their pre_reset
3062 * method), performs the port reset, and then lets the drivers know that
3063 * the reset is over (using their post_reset method).
3065 * Return value is the same as for usb_reset_device().
3067 * The caller must own the device lock. For example, it's safe to use
3068 * this from a driver probe() routine after downloading new firmware.
3069 * For calls that might not occur during probe(), drivers should lock
3070 * the device using usb_lock_device_for_reset().
3072 * The interface locks are acquired during the pre_reset stage and released
3073 * during the post_reset stage. However if iface is not NULL and is
3074 * currently being probed, we assume that the caller already owns its
3077 int usb_reset_composite_device(struct usb_device
*udev
,
3078 struct usb_interface
*iface
)
3081 struct usb_host_config
*config
= udev
->actconfig
;
3083 if (udev
->state
== USB_STATE_NOTATTACHED
||
3084 udev
->state
== USB_STATE_SUSPENDED
) {
3085 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3090 /* Prevent autosuspend during the reset */
3091 usb_autoresume_device(udev
, 1);
3093 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3098 struct usb_interface
*cintf
;
3099 struct usb_driver
*drv
;
3101 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3102 cintf
= config
->interface
[i
];
3104 down(&cintf
->dev
.sem
);
3105 if (device_is_registered(&cintf
->dev
) &&
3106 cintf
->dev
.driver
) {
3107 drv
= to_usb_driver(cintf
->dev
.driver
);
3109 (drv
->pre_reset
)(cintf
);
3114 ret
= usb_reset_device(udev
);
3118 struct usb_interface
*cintf
;
3119 struct usb_driver
*drv
;
3121 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3122 cintf
= config
->interface
[i
];
3123 if (device_is_registered(&cintf
->dev
) &&
3124 cintf
->dev
.driver
) {
3125 drv
= to_usb_driver(cintf
->dev
.driver
);
3126 if (drv
->post_reset
)
3127 (drv
->post_reset
)(cintf
);
3130 up(&cintf
->dev
.sem
);
3134 usb_autosuspend_device(udev
, 1);
3137 EXPORT_SYMBOL(usb_reset_composite_device
);