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 delayed_work 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 (struct work_struct
*work
)
223 struct usb_hub
*hub
=
224 container_of(work
, struct usb_hub
, leds
.work
);
225 struct usb_device
*hdev
= hub
->hdev
;
227 unsigned changed
= 0;
230 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
233 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
234 unsigned selector
, mode
;
236 /* 30%-50% duty cycle */
238 switch (hub
->indicator
[i
]) {
240 case INDICATOR_CYCLE
:
242 selector
= HUB_LED_AUTO
;
243 mode
= INDICATOR_AUTO
;
245 /* blinking green = sw attention */
246 case INDICATOR_GREEN_BLINK
:
247 selector
= HUB_LED_GREEN
;
248 mode
= INDICATOR_GREEN_BLINK_OFF
;
250 case INDICATOR_GREEN_BLINK_OFF
:
251 selector
= HUB_LED_OFF
;
252 mode
= INDICATOR_GREEN_BLINK
;
254 /* blinking amber = hw attention */
255 case INDICATOR_AMBER_BLINK
:
256 selector
= HUB_LED_AMBER
;
257 mode
= INDICATOR_AMBER_BLINK_OFF
;
259 case INDICATOR_AMBER_BLINK_OFF
:
260 selector
= HUB_LED_OFF
;
261 mode
= INDICATOR_AMBER_BLINK
;
263 /* blink green/amber = reserved */
264 case INDICATOR_ALT_BLINK
:
265 selector
= HUB_LED_GREEN
;
266 mode
= INDICATOR_ALT_BLINK_OFF
;
268 case INDICATOR_ALT_BLINK_OFF
:
269 selector
= HUB_LED_AMBER
;
270 mode
= INDICATOR_ALT_BLINK
;
275 if (selector
!= HUB_LED_AUTO
)
277 set_port_led(hub
, i
+ 1, selector
);
278 hub
->indicator
[i
] = mode
;
280 if (!changed
&& blinkenlights
) {
282 cursor
%= hub
->descriptor
->bNbrPorts
;
283 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
284 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
288 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
291 /* use a short timeout for hub/port status fetches */
292 #define USB_STS_TIMEOUT 1000
293 #define USB_STS_RETRIES 5
296 * USB 2.0 spec Section 11.24.2.6
298 static int get_hub_status(struct usb_device
*hdev
,
299 struct usb_hub_status
*data
)
301 int i
, status
= -ETIMEDOUT
;
303 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
304 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
305 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
306 data
, sizeof(*data
), USB_STS_TIMEOUT
);
312 * USB 2.0 spec Section 11.24.2.7
314 static int get_port_status(struct usb_device
*hdev
, int port1
,
315 struct usb_port_status
*data
)
317 int i
, status
= -ETIMEDOUT
;
319 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
320 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
321 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
322 data
, sizeof(*data
), USB_STS_TIMEOUT
);
327 static void kick_khubd(struct usb_hub
*hub
)
331 /* Suppress autosuspend until khubd runs */
332 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
334 spin_lock_irqsave(&hub_event_lock
, flags
);
335 if (list_empty(&hub
->event_list
)) {
336 list_add_tail(&hub
->event_list
, &hub_event_list
);
337 wake_up(&khubd_wait
);
339 spin_unlock_irqrestore(&hub_event_lock
, flags
);
342 void usb_kick_khubd(struct usb_device
*hdev
)
344 kick_khubd(hdev_to_hub(hdev
));
348 /* completion function, fires on port status changes and various faults */
349 static void hub_irq(struct urb
*urb
)
351 struct usb_hub
*hub
= urb
->context
;
356 switch (urb
->status
) {
357 case -ENOENT
: /* synchronous unlink */
358 case -ECONNRESET
: /* async unlink */
359 case -ESHUTDOWN
: /* hardware going away */
362 default: /* presumably an error */
363 /* Cause a hub reset after 10 consecutive errors */
364 dev_dbg (hub
->intfdev
, "transfer --> %d\n", urb
->status
);
365 if ((++hub
->nerrors
< 10) || hub
->error
)
367 hub
->error
= urb
->status
;
370 /* let khubd handle things */
371 case 0: /* we got data: port status changed */
373 for (i
= 0; i
< urb
->actual_length
; ++i
)
374 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
376 hub
->event_bits
[0] = bits
;
382 /* Something happened, let khubd figure it out */
389 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
390 && status
!= -ENODEV
&& status
!= -EPERM
)
391 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
394 /* USB 2.0 spec Section 11.24.2.3 */
396 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
398 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
399 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
404 * enumeration blocks khubd for a long time. we use keventd instead, since
405 * long blocking there is the exception, not the rule. accordingly, HCDs
406 * talking to TTs must queue control transfers (not just bulk and iso), so
407 * both can talk to the same hub concurrently.
409 static void hub_tt_kevent (struct work_struct
*work
)
411 struct usb_hub
*hub
=
412 container_of(work
, struct usb_hub
, tt
.kevent
);
415 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
416 while (!list_empty (&hub
->tt
.clear_list
)) {
417 struct list_head
*temp
;
418 struct usb_tt_clear
*clear
;
419 struct usb_device
*hdev
= hub
->hdev
;
422 temp
= hub
->tt
.clear_list
.next
;
423 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
424 list_del (&clear
->clear_list
);
426 /* drop lock so HCD can concurrently report other TT errors */
427 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
428 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
429 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
433 "clear tt %d (%04x) error %d\n",
434 clear
->tt
, clear
->devinfo
, status
);
437 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
441 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
442 * @udev: the device whose split transaction failed
443 * @pipe: identifies the endpoint of the failed transaction
445 * High speed HCDs use this to tell the hub driver that some split control or
446 * bulk transaction failed in a way that requires clearing internal state of
447 * a transaction translator. This is normally detected (and reported) from
450 * It may not be possible for that hub to handle additional full (or low)
451 * speed transactions until that state is fully cleared out.
453 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
455 struct usb_tt
*tt
= udev
->tt
;
457 struct usb_tt_clear
*clear
;
459 /* we've got to cope with an arbitrary number of pending TT clears,
460 * since each TT has "at least two" buffers that can need it (and
461 * there can be many TTs per hub). even if they're uncommon.
463 if ((clear
= kmalloc (sizeof *clear
, SLAB_ATOMIC
)) == NULL
) {
464 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
465 /* FIXME recover somehow ... RESET_TT? */
469 /* info that CLEAR_TT_BUFFER needs */
470 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
471 clear
->devinfo
= usb_pipeendpoint (pipe
);
472 clear
->devinfo
|= udev
->devnum
<< 4;
473 clear
->devinfo
|= usb_pipecontrol (pipe
)
474 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
475 : (USB_ENDPOINT_XFER_BULK
<< 11);
476 if (usb_pipein (pipe
))
477 clear
->devinfo
|= 1 << 15;
479 /* tell keventd to clear state for this TT */
480 spin_lock_irqsave (&tt
->lock
, flags
);
481 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
482 schedule_work (&tt
->kevent
);
483 spin_unlock_irqrestore (&tt
->lock
, flags
);
486 static void hub_power_on(struct usb_hub
*hub
)
489 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
490 u16 wHubCharacteristics
=
491 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
493 /* Enable power on each port. Some hubs have reserved values
494 * of LPSM (> 2) in their descriptors, even though they are
495 * USB 2.0 hubs. Some hubs do not implement port-power switching
496 * but only emulate it. In all cases, the ports won't work
497 * unless we send these messages to the hub.
499 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
500 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
502 dev_dbg(hub
->intfdev
, "trying to enable port power on "
503 "non-switchable hub\n");
504 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
505 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
507 /* Wait at least 100 msec for power to become stable */
508 msleep(max(pgood_delay
, (unsigned) 100));
511 static void hub_quiesce(struct usb_hub
*hub
)
513 /* (nonblocking) khubd and related activity won't re-trigger */
517 /* (blocking) stop khubd and related activity */
518 usb_kill_urb(hub
->urb
);
519 if (hub
->has_indicators
)
520 cancel_delayed_work(&hub
->leds
);
521 if (hub
->has_indicators
|| hub
->tt
.hub
)
522 flush_scheduled_work();
525 static void hub_activate(struct usb_hub
*hub
)
532 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
534 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
535 if (hub
->has_indicators
&& blinkenlights
)
536 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
538 /* scan all ports ASAP */
542 static int hub_hub_status(struct usb_hub
*hub
,
543 u16
*status
, u16
*change
)
547 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
549 dev_err (hub
->intfdev
,
550 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
552 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
553 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
559 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
561 struct usb_device
*hdev
= hub
->hdev
;
564 if (hdev
->children
[port1
-1] && set_state
) {
565 usb_set_device_state(hdev
->children
[port1
-1],
566 USB_STATE_NOTATTACHED
);
568 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
570 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
577 /* caller has locked the hub device */
578 static void hub_pre_reset(struct usb_interface
*intf
)
580 struct usb_hub
*hub
= usb_get_intfdata(intf
);
581 struct usb_device
*hdev
= hub
->hdev
;
584 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
585 if (hdev
->children
[port1
- 1]) {
586 usb_disconnect(&hdev
->children
[port1
- 1]);
588 hub_port_disable(hub
, port1
, 0);
594 /* caller has locked the hub device */
595 static void hub_post_reset(struct usb_interface
*intf
)
597 struct usb_hub
*hub
= usb_get_intfdata(intf
);
604 static int hub_configure(struct usb_hub
*hub
,
605 struct usb_endpoint_descriptor
*endpoint
)
607 struct usb_device
*hdev
= hub
->hdev
;
608 struct device
*hub_dev
= hub
->intfdev
;
609 u16 hubstatus
, hubchange
;
610 u16 wHubCharacteristics
;
615 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
618 message
= "can't allocate hub irq buffer";
623 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
625 message
= "can't kmalloc hub status buffer";
630 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
631 if (!hub
->descriptor
) {
632 message
= "can't kmalloc hub descriptor";
637 /* Request the entire hub descriptor.
638 * hub->descriptor can handle USB_MAXCHILDREN ports,
639 * but the hub can/will return fewer bytes here.
641 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
642 sizeof(*hub
->descriptor
));
644 message
= "can't read hub descriptor";
646 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
647 message
= "hub has too many ports!";
652 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
653 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
654 (hdev
->maxchild
== 1) ? "" : "s");
656 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
658 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
660 char portstr
[USB_MAXCHILDREN
+ 1];
662 for (i
= 0; i
< hdev
->maxchild
; i
++)
663 portstr
[i
] = hub
->descriptor
->DeviceRemovable
664 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
666 portstr
[hdev
->maxchild
] = 0;
667 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
669 dev_dbg(hub_dev
, "standalone hub\n");
671 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
673 dev_dbg(hub_dev
, "ganged power switching\n");
676 dev_dbg(hub_dev
, "individual port power switching\n");
680 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
684 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
686 dev_dbg(hub_dev
, "global over-current protection\n");
689 dev_dbg(hub_dev
, "individual port over-current protection\n");
693 dev_dbg(hub_dev
, "no over-current protection\n");
697 spin_lock_init (&hub
->tt
.lock
);
698 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
699 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
);
700 switch (hdev
->descriptor
.bDeviceProtocol
) {
704 dev_dbg(hub_dev
, "Single TT\n");
708 ret
= usb_set_interface(hdev
, 0, 1);
710 dev_dbg(hub_dev
, "TT per port\n");
713 dev_err(hub_dev
, "Using single TT (err %d)\n",
718 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
719 hdev
->descriptor
.bDeviceProtocol
);
723 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
724 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
725 case HUB_TTTT_8_BITS
:
726 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
727 hub
->tt
.think_time
= 666;
728 dev_dbg(hub_dev
, "TT requires at most %d "
729 "FS bit times (%d ns)\n",
730 8, hub
->tt
.think_time
);
733 case HUB_TTTT_16_BITS
:
734 hub
->tt
.think_time
= 666 * 2;
735 dev_dbg(hub_dev
, "TT requires at most %d "
736 "FS bit times (%d ns)\n",
737 16, hub
->tt
.think_time
);
739 case HUB_TTTT_24_BITS
:
740 hub
->tt
.think_time
= 666 * 3;
741 dev_dbg(hub_dev
, "TT requires at most %d "
742 "FS bit times (%d ns)\n",
743 24, hub
->tt
.think_time
);
745 case HUB_TTTT_32_BITS
:
746 hub
->tt
.think_time
= 666 * 4;
747 dev_dbg(hub_dev
, "TT requires at most %d "
748 "FS bit times (%d ns)\n",
749 32, hub
->tt
.think_time
);
753 /* probe() zeroes hub->indicator[] */
754 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
755 hub
->has_indicators
= 1;
756 dev_dbg(hub_dev
, "Port indicators are supported\n");
759 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
760 hub
->descriptor
->bPwrOn2PwrGood
* 2);
762 /* power budgeting mostly matters with bus-powered hubs,
763 * and battery-powered root hubs (may provide just 8 mA).
765 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
767 message
= "can't get hub status";
770 le16_to_cpus(&hubstatus
);
771 if (hdev
== hdev
->bus
->root_hub
) {
772 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
773 hub
->mA_per_port
= 500;
775 hub
->mA_per_port
= hdev
->bus_mA
;
776 hub
->limited_power
= 1;
778 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
779 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
780 hub
->descriptor
->bHubContrCurrent
);
781 hub
->limited_power
= 1;
782 if (hdev
->maxchild
> 0) {
783 int remaining
= hdev
->bus_mA
-
784 hub
->descriptor
->bHubContrCurrent
;
786 if (remaining
< hdev
->maxchild
* 100)
788 "insufficient power available "
789 "to use all downstream ports\n");
790 hub
->mA_per_port
= 100; /* 7.2.1.1 */
792 } else { /* Self-powered external hub */
793 /* FIXME: What about battery-powered external hubs that
794 * provide less current per port? */
795 hub
->mA_per_port
= 500;
797 if (hub
->mA_per_port
< 500)
798 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
801 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
803 message
= "can't get hub status";
807 /* local power status reports aren't always correct */
808 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
809 dev_dbg(hub_dev
, "local power source is %s\n",
810 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
811 ? "lost (inactive)" : "good");
813 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
814 dev_dbg(hub_dev
, "%sover-current condition exists\n",
815 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
817 /* set up the interrupt endpoint
818 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
819 * bytes as USB2.0[11.12.3] says because some hubs are known
820 * to send more data (and thus cause overflow). For root hubs,
821 * maxpktsize is defined in hcd.c's fake endpoint descriptors
822 * to be big enough for at least USB_MAXCHILDREN ports. */
823 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
824 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
826 if (maxp
> sizeof(*hub
->buffer
))
827 maxp
= sizeof(*hub
->buffer
);
829 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
831 message
= "couldn't allocate interrupt urb";
836 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
837 hub
, endpoint
->bInterval
);
838 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
839 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
841 /* maybe cycle the hub leds */
842 if (hub
->has_indicators
&& blinkenlights
)
843 hub
->indicator
[0] = INDICATOR_CYCLE
;
850 dev_err (hub_dev
, "config failed, %s (err %d)\n",
852 /* hub_disconnect() frees urb and descriptor */
856 static unsigned highspeed_hubs
;
858 static void hub_disconnect(struct usb_interface
*intf
)
860 struct usb_hub
*hub
= usb_get_intfdata (intf
);
861 struct usb_device
*hdev
;
863 /* Disconnect all children and quiesce the hub */
867 usb_set_intfdata (intf
, NULL
);
870 if (hdev
->speed
== USB_SPEED_HIGH
)
873 usb_free_urb(hub
->urb
);
876 spin_lock_irq(&hub_event_lock
);
877 list_del_init(&hub
->event_list
);
878 spin_unlock_irq(&hub_event_lock
);
880 kfree(hub
->descriptor
);
881 hub
->descriptor
= NULL
;
887 usb_buffer_free(hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
895 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
897 struct usb_host_interface
*desc
;
898 struct usb_endpoint_descriptor
*endpoint
;
899 struct usb_device
*hdev
;
902 desc
= intf
->cur_altsetting
;
903 hdev
= interface_to_usbdev(intf
);
905 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
907 dev_warn(&intf
->dev
, "ignoring external hub\n");
912 /* Some hubs have a subclass of 1, which AFAICT according to the */
913 /* specs is not defined, but it works */
914 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
915 (desc
->desc
.bInterfaceSubClass
!= 1)) {
917 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
921 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
922 if (desc
->desc
.bNumEndpoints
!= 1)
923 goto descriptor_error
;
925 endpoint
= &desc
->endpoint
[0].desc
;
927 /* If it's not an interrupt in endpoint, we'd better punt! */
928 if (!usb_endpoint_is_int_in(endpoint
))
929 goto descriptor_error
;
932 dev_info (&intf
->dev
, "USB hub found\n");
934 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
936 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
940 INIT_LIST_HEAD(&hub
->event_list
);
941 hub
->intfdev
= &intf
->dev
;
943 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
945 usb_set_intfdata (intf
, hub
);
946 intf
->needs_remote_wakeup
= 1;
948 if (hdev
->speed
== USB_SPEED_HIGH
)
951 if (hub_configure(hub
, endpoint
) >= 0)
954 hub_disconnect (intf
);
959 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
961 struct usb_device
*hdev
= interface_to_usbdev (intf
);
963 /* assert ifno == 0 (part of hub spec) */
965 case USBDEVFS_HUB_PORTINFO
: {
966 struct usbdevfs_hub_portinfo
*info
= user_data
;
969 spin_lock_irq(&device_state_lock
);
970 if (hdev
->devnum
<= 0)
973 info
->nports
= hdev
->maxchild
;
974 for (i
= 0; i
< info
->nports
; i
++) {
975 if (hdev
->children
[i
] == NULL
)
979 hdev
->children
[i
]->devnum
;
982 spin_unlock_irq(&device_state_lock
);
984 return info
->nports
+ 1;
993 /* grab device/port lock, returning index of that port (zero based).
994 * protects the upstream link used by this device from concurrent
995 * tree operations like suspend, resume, reset, and disconnect, which
996 * apply to everything downstream of a given port.
998 static int locktree(struct usb_device
*udev
)
1001 struct usb_device
*hdev
;
1006 /* root hub is always the first lock in the series */
1007 hdev
= udev
->parent
;
1009 usb_lock_device(udev
);
1013 /* on the path from root to us, lock everything from
1014 * top down, dropping parent locks when not needed
1020 /* everything is fail-fast once disconnect
1023 if (udev
->state
== USB_STATE_NOTATTACHED
) {
1024 usb_unlock_device(hdev
);
1028 /* when everyone grabs locks top->bottom,
1029 * non-overlapping work may be concurrent
1031 usb_lock_device(udev
);
1032 usb_unlock_device(hdev
);
1033 return udev
->portnum
;
1036 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1040 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1041 if (udev
->children
[i
])
1042 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1044 if (udev
->state
== USB_STATE_SUSPENDED
)
1045 udev
->discon_suspended
= 1;
1046 udev
->state
= USB_STATE_NOTATTACHED
;
1050 * usb_set_device_state - change a device's current state (usbcore, hcds)
1051 * @udev: pointer to device whose state should be changed
1052 * @new_state: new state value to be stored
1054 * udev->state is _not_ fully protected by the device lock. Although
1055 * most transitions are made only while holding the lock, the state can
1056 * can change to USB_STATE_NOTATTACHED at almost any time. This
1057 * is so that devices can be marked as disconnected as soon as possible,
1058 * without having to wait for any semaphores to be released. As a result,
1059 * all changes to any device's state must be protected by the
1060 * device_state_lock spinlock.
1062 * Once a device has been added to the device tree, all changes to its state
1063 * should be made using this routine. The state should _not_ be set directly.
1065 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1066 * Otherwise udev->state is set to new_state, and if new_state is
1067 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1068 * to USB_STATE_NOTATTACHED.
1070 void usb_set_device_state(struct usb_device
*udev
,
1071 enum usb_device_state new_state
)
1073 unsigned long flags
;
1075 spin_lock_irqsave(&device_state_lock
, flags
);
1076 if (udev
->state
== USB_STATE_NOTATTACHED
)
1078 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1080 /* root hub wakeup capabilities are managed out-of-band
1081 * and may involve silicon errata ... ignore them here.
1084 if (udev
->state
== USB_STATE_SUSPENDED
1085 || new_state
== USB_STATE_SUSPENDED
)
1086 ; /* No change to wakeup settings */
1087 else if (new_state
== USB_STATE_CONFIGURED
)
1088 device_init_wakeup(&udev
->dev
,
1089 (udev
->actconfig
->desc
.bmAttributes
1090 & USB_CONFIG_ATT_WAKEUP
));
1092 device_init_wakeup(&udev
->dev
, 0);
1094 udev
->state
= new_state
;
1096 recursively_mark_NOTATTACHED(udev
);
1097 spin_unlock_irqrestore(&device_state_lock
, flags
);
1104 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1105 * @rhdev: struct usb_device for the root hub
1107 * The USB host controller driver calls this function when its root hub
1108 * is resumed and Vbus power has been interrupted or the controller
1109 * has been reset. The routine marks all the children of the root hub
1110 * as NOTATTACHED and marks logical connect-change events on their ports.
1112 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
1114 struct usb_hub
*hub
;
1116 unsigned long flags
;
1118 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
1120 /* Make sure no potential wakeup events get lost,
1121 * by forcing the root hub to be resumed.
1123 rhdev
->dev
.power
.prev_state
.event
= PM_EVENT_ON
;
1125 spin_lock_irqsave(&device_state_lock
, flags
);
1126 hub
= hdev_to_hub(rhdev
);
1127 for (port1
= 1; port1
<= rhdev
->maxchild
; ++port1
) {
1128 if (rhdev
->children
[port1
- 1]) {
1129 recursively_mark_NOTATTACHED(
1130 rhdev
->children
[port1
- 1]);
1131 set_bit(port1
, hub
->change_bits
);
1134 spin_unlock_irqrestore(&device_state_lock
, flags
);
1136 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
1138 #endif /* CONFIG_PM */
1140 static void choose_address(struct usb_device
*udev
)
1143 struct usb_bus
*bus
= udev
->bus
;
1145 /* If khubd ever becomes multithreaded, this will need a lock */
1147 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1148 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1151 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1153 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1156 set_bit(devnum
, bus
->devmap
.devicemap
);
1157 udev
->devnum
= devnum
;
1161 static void release_address(struct usb_device
*udev
)
1163 if (udev
->devnum
> 0) {
1164 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1170 * usb_disconnect - disconnect a device (usbcore-internal)
1171 * @pdev: pointer to device being disconnected
1172 * Context: !in_interrupt ()
1174 * Something got disconnected. Get rid of it and all of its children.
1176 * If *pdev is a normal device then the parent hub must already be locked.
1177 * If *pdev is a root hub then this routine will acquire the
1178 * usb_bus_list_lock on behalf of the caller.
1180 * Only hub drivers (including virtual root hub drivers for host
1181 * controllers) should ever call this.
1183 * This call is synchronous, and may not be used in an interrupt context.
1185 void usb_disconnect(struct usb_device
**pdev
)
1187 struct usb_device
*udev
= *pdev
;
1191 pr_debug ("%s nodev\n", __FUNCTION__
);
1195 /* mark the device as inactive, so any further urb submissions for
1196 * this device (and any of its children) will fail immediately.
1197 * this quiesces everyting except pending urbs.
1199 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1200 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1202 usb_lock_device(udev
);
1204 /* Free up all the children before we remove this device */
1205 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1206 if (udev
->children
[i
])
1207 usb_disconnect(&udev
->children
[i
]);
1210 /* deallocate hcd/hardware state ... nuking all pending urbs and
1211 * cleaning up all state associated with the current configuration
1212 * so that the hardware is now fully quiesced.
1214 dev_dbg (&udev
->dev
, "unregistering device\n");
1215 usb_disable_device(udev
, 0);
1217 usb_unlock_device(udev
);
1219 /* Unregister the device. The device driver is responsible
1220 * for removing the device files from usbfs and sysfs and for
1221 * de-configuring the device.
1223 device_del(&udev
->dev
);
1225 /* Free the device number and delete the parent's children[]
1226 * (or root_hub) pointer.
1228 release_address(udev
);
1230 /* Avoid races with recursively_mark_NOTATTACHED() */
1231 spin_lock_irq(&device_state_lock
);
1233 spin_unlock_irq(&device_state_lock
);
1235 /* Decrement the parent's count of unsuspended children */
1238 if (!udev
->discon_suspended
)
1239 usb_autosuspend_device(udev
->parent
);
1240 usb_pm_unlock(udev
);
1243 put_device(&udev
->dev
);
1247 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1251 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1255 static inline void show_string(struct usb_device
*udev
, char *id
, char *string
)
1260 #ifdef CONFIG_USB_OTG
1261 #include "otg_whitelist.h"
1262 static int __usb_port_suspend(struct usb_device
*, int port1
);
1265 static int __usb_new_device(void *void_data
)
1267 struct usb_device
*udev
= void_data
;
1270 /* Lock ourself into memory in order to keep a probe sequence
1271 * sleeping in a new thread from allowing us to be unloaded.
1273 if (!try_module_get(THIS_MODULE
))
1276 err
= usb_get_configuration(udev
);
1278 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1283 /* read the standard strings and cache them if present */
1284 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1285 udev
->manufacturer
= usb_cache_string(udev
,
1286 udev
->descriptor
.iManufacturer
);
1287 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1289 /* Tell the world! */
1290 dev_dbg(&udev
->dev
, "new device strings: Mfr=%d, Product=%d, "
1291 "SerialNumber=%d\n",
1292 udev
->descriptor
.iManufacturer
,
1293 udev
->descriptor
.iProduct
,
1294 udev
->descriptor
.iSerialNumber
);
1295 show_string(udev
, "Product", udev
->product
);
1296 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1297 show_string(udev
, "SerialNumber", udev
->serial
);
1299 #ifdef CONFIG_USB_OTG
1301 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1302 * to wake us after we've powered off VBUS; and HNP, switching roles
1303 * "host" to "peripheral". The OTG descriptor helps figure this out.
1305 if (!udev
->bus
->is_b_host
1307 && udev
->parent
== udev
->bus
->root_hub
) {
1308 struct usb_otg_descriptor
*desc
= 0;
1309 struct usb_bus
*bus
= udev
->bus
;
1311 /* descriptor may appear anywhere in config */
1312 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1313 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1314 USB_DT_OTG
, (void **) &desc
) == 0) {
1315 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1316 unsigned port1
= udev
->portnum
;
1318 dev_info(&udev
->dev
,
1319 "Dual-Role OTG device on %sHNP port\n",
1320 (port1
== bus
->otg_port
)
1323 /* enable HNP before suspend, it's simpler */
1324 if (port1
== bus
->otg_port
)
1325 bus
->b_hnp_enable
= 1;
1326 err
= usb_control_msg(udev
,
1327 usb_sndctrlpipe(udev
, 0),
1328 USB_REQ_SET_FEATURE
, 0,
1330 ? USB_DEVICE_B_HNP_ENABLE
1331 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1332 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1334 /* OTG MESSAGE: report errors here,
1335 * customize to match your product.
1337 dev_info(&udev
->dev
,
1338 "can't set HNP mode; %d\n",
1340 bus
->b_hnp_enable
= 0;
1346 if (!is_targeted(udev
)) {
1348 /* Maybe it can talk to us, though we can't talk to it.
1349 * (Includes HNP test device.)
1351 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1352 err
= __usb_port_suspend(udev
, udev
->bus
->otg_port
);
1354 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1361 /* Register the device. The device driver is responsible
1362 * for adding the device files to usbfs and sysfs and for
1363 * configuring the device.
1365 err
= device_add (&udev
->dev
);
1367 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1371 /* Increment the parent's count of unsuspended children */
1373 usb_autoresume_device(udev
->parent
);
1376 module_put(THIS_MODULE
);
1380 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1385 * usb_new_device - perform initial device setup (usbcore-internal)
1386 * @udev: newly addressed device (in ADDRESS state)
1388 * This is called with devices which have been enumerated, but not yet
1389 * configured. The device descriptor is available, but not descriptors
1390 * for any device configuration. The caller must have locked either
1391 * the parent hub (if udev is a normal device) or else the
1392 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1393 * udev has already been installed, but udev is not yet visible through
1394 * sysfs or other filesystem code.
1396 * The return value for this function depends on if the
1397 * multithread_probe variable is set or not. If it's set, it will
1398 * return a if the probe thread was successfully created or not. If the
1399 * variable is not set, it will return if the device is configured
1400 * properly or not. interfaces, in sysfs); else a negative errno value.
1402 * This call is synchronous, and may not be used in an interrupt context.
1404 * Only the hub driver or root-hub registrar should ever call this.
1406 int usb_new_device(struct usb_device
*udev
)
1408 struct task_struct
*probe_task
;
1411 if (multithread_probe
) {
1412 probe_task
= kthread_run(__usb_new_device
, udev
,
1413 "usb-probe-%s", udev
->devnum
);
1414 if (IS_ERR(probe_task
))
1415 ret
= PTR_ERR(probe_task
);
1417 ret
= __usb_new_device(udev
);
1422 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1423 u16
*status
, u16
*change
)
1427 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1429 dev_err (hub
->intfdev
,
1430 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1434 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1435 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1442 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1443 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1445 struct usb_hcd
*hcd
;
1446 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1448 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1449 return hcd
->wireless
;
1453 #define PORT_RESET_TRIES 5
1454 #define SET_ADDRESS_TRIES 2
1455 #define GET_DESCRIPTOR_TRIES 2
1456 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1457 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1459 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1460 #define HUB_SHORT_RESET_TIME 10
1461 #define HUB_LONG_RESET_TIME 200
1462 #define HUB_RESET_TIMEOUT 500
1464 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1465 struct usb_device
*udev
, unsigned int delay
)
1467 int delay_time
, ret
;
1471 for (delay_time
= 0;
1472 delay_time
< HUB_RESET_TIMEOUT
;
1473 delay_time
+= delay
) {
1474 /* wait to give the device a chance to reset */
1477 /* read and decode port status */
1478 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1482 /* Device went away? */
1483 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1486 /* bomb out completely if something weird happened */
1487 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1490 /* if we`ve finished resetting, then break out of the loop */
1491 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1492 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1493 if (hub_is_wusb(hub
))
1494 udev
->speed
= USB_SPEED_VARIABLE
;
1495 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1496 udev
->speed
= USB_SPEED_HIGH
;
1497 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1498 udev
->speed
= USB_SPEED_LOW
;
1500 udev
->speed
= USB_SPEED_FULL
;
1504 /* switch to the long delay after two short delay failures */
1505 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1506 delay
= HUB_LONG_RESET_TIME
;
1508 dev_dbg (hub
->intfdev
,
1509 "port %d not reset yet, waiting %dms\n",
1516 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1517 struct usb_device
*udev
, unsigned int delay
)
1521 /* Reset the port */
1522 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1523 status
= set_port_feature(hub
->hdev
,
1524 port1
, USB_PORT_FEAT_RESET
);
1526 dev_err(hub
->intfdev
,
1527 "cannot reset port %d (err = %d)\n",
1530 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1531 if (status
&& status
!= -ENOTCONN
)
1532 dev_dbg(hub
->intfdev
,
1533 "port_wait_reset: err = %d\n",
1537 /* return on disconnect or reset */
1540 /* TRSTRCY = 10 ms; plus some extra */
1545 clear_port_feature(hub
->hdev
,
1546 port1
, USB_PORT_FEAT_C_RESET
);
1547 /* FIXME need disconnect() for NOTATTACHED device */
1548 usb_set_device_state(udev
, status
1549 ? USB_STATE_NOTATTACHED
1550 : USB_STATE_DEFAULT
);
1554 dev_dbg (hub
->intfdev
,
1555 "port %d not enabled, trying reset again...\n",
1557 delay
= HUB_LONG_RESET_TIME
;
1560 dev_err (hub
->intfdev
,
1561 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1568 * Disable a port and mark a logical connnect-change event, so that some
1569 * time later khubd will disconnect() any existing usb_device on the port
1570 * and will re-enumerate if there actually is a device attached.
1572 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
1574 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
1575 hub_port_disable(hub
, port1
, 1);
1577 /* FIXME let caller ask to power down the port:
1578 * - some devices won't enumerate without a VBUS power cycle
1579 * - SRP saves power that way
1580 * - ... new call, TBD ...
1581 * That's easy if this hub can switch power per-port, and
1582 * khubd reactivates the port later (timer, SRP, etc).
1583 * Powerdown must be optional, because of reset/DFU.
1586 set_bit(port1
, hub
->change_bits
);
1592 #ifdef CONFIG_USB_SUSPEND
1595 * Selective port suspend reduces power; most suspended devices draw
1596 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1597 * All devices below the suspended port are also suspended.
1599 * Devices leave suspend state when the host wakes them up. Some devices
1600 * also support "remote wakeup", where the device can activate the USB
1601 * tree above them to deliver data, such as a keypress or packet. In
1602 * some cases, this wakes the USB host.
1604 static int hub_port_suspend(struct usb_hub
*hub
, int port1
,
1605 struct usb_device
*udev
)
1609 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1611 /* enable remote wakeup when appropriate; this lets the device
1612 * wake up the upstream hub (including maybe the root hub).
1614 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1615 * we don't explicitly enable it here.
1617 if (udev
->do_remote_wakeup
) {
1618 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1619 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1620 USB_DEVICE_REMOTE_WAKEUP
, 0,
1622 USB_CTRL_SET_TIMEOUT
);
1625 "won't remote wakeup, status %d\n",
1630 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1632 dev_dbg(hub
->intfdev
,
1633 "can't suspend port %d, status %d\n",
1635 /* paranoia: "should not happen" */
1636 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1637 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1638 USB_DEVICE_REMOTE_WAKEUP
, 0,
1640 USB_CTRL_SET_TIMEOUT
);
1642 /* device has up to 10 msec to fully suspend */
1643 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1644 udev
->auto_pm
? "auto-" : "");
1645 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1652 * Devices on USB hub ports have only one "suspend" state, corresponding
1653 * to ACPI D2, "may cause the device to lose some context".
1654 * State transitions include:
1656 * - suspend, resume ... when the VBUS power link stays live
1657 * - suspend, disconnect ... VBUS lost
1659 * Once VBUS drop breaks the circuit, the port it's using has to go through
1660 * normal re-enumeration procedures, starting with enabling VBUS power.
1661 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1662 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1663 * timer, no SRP, no requests through sysfs.
1665 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1666 * the root hub for their bus goes into global suspend ... so we don't
1667 * (falsely) update the device power state to say it suspended.
1669 static int __usb_port_suspend (struct usb_device
*udev
, int port1
)
1673 /* caller owns the udev device lock */
1677 /* we change the device's upstream USB link,
1678 * but root hubs have no upstream USB link.
1681 status
= hub_port_suspend(hdev_to_hub(udev
->parent
), port1
,
1684 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1685 udev
->auto_pm
? "auto-" : "");
1686 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1692 * usb_port_suspend - suspend a usb device's upstream port
1693 * @udev: device that's no longer in active use
1694 * Context: must be able to sleep; device not locked; pm locks held
1696 * Suspends a USB device that isn't in active use, conserving power.
1697 * Devices may wake out of a suspend, if anything important happens,
1698 * using the remote wakeup mechanism. They may also be taken out of
1699 * suspend by the host, using usb_port_resume(). It's also routine
1700 * to disconnect devices while they are suspended.
1702 * This only affects the USB hardware for a device; its interfaces
1703 * (and, for hubs, child devices) must already have been suspended.
1705 * Suspending OTG devices may trigger HNP, if that's been enabled
1706 * between a pair of dual-role devices. That will change roles, such
1707 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1709 * Returns 0 on success, else negative errno.
1711 int usb_port_suspend(struct usb_device
*udev
)
1713 return __usb_port_suspend(udev
, udev
->portnum
);
1717 * If the USB "suspend" state is in use (rather than "global suspend"),
1718 * many devices will be individually taken out of suspend state using
1719 * special" resume" signaling. These routines kick in shortly after
1720 * hardware resume signaling is finished, either because of selective
1721 * resume (by host) or remote wakeup (by device) ... now see what changed
1722 * in the tree that's rooted at this device.
1724 static int finish_port_resume(struct usb_device
*udev
)
1729 /* caller owns the udev device lock */
1730 dev_dbg(&udev
->dev
, "finish resume\n");
1732 /* usb ch9 identifies four variants of SUSPENDED, based on what
1733 * state the device resumes to. Linux currently won't see the
1734 * first two on the host side; they'd be inside hub_port_init()
1735 * during many timeouts, but khubd can't suspend until later.
1737 usb_set_device_state(udev
, udev
->actconfig
1738 ? USB_STATE_CONFIGURED
1739 : USB_STATE_ADDRESS
);
1741 /* 10.5.4.5 says be sure devices in the tree are still there.
1742 * For now let's assume the device didn't go crazy on resume,
1743 * and device drivers will know about any resume quirks.
1745 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1747 status
= (status
== 2 ? 0 : -ENODEV
);
1751 "gone after usb resume? status %d\n",
1753 else if (udev
->actconfig
) {
1754 le16_to_cpus(&devstatus
);
1755 if ((devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
1757 status
= usb_control_msg(udev
,
1758 usb_sndctrlpipe(udev
, 0),
1759 USB_REQ_CLEAR_FEATURE
,
1761 USB_DEVICE_REMOTE_WAKEUP
, 0,
1763 USB_CTRL_SET_TIMEOUT
);
1765 dev_dbg(&udev
->dev
, "disable remote "
1766 "wakeup, status %d\n", status
);
1770 } else if (udev
->devnum
<= 0) {
1771 dev_dbg(&udev
->dev
, "bogus resume!\n");
1778 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1781 u16 portchange
, portstatus
;
1783 /* Skip the initial Clear-Suspend step for a remote wakeup */
1784 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1785 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
1786 goto SuspendCleared
;
1788 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1790 set_bit(port1
, hub
->busy_bits
);
1792 /* see 7.1.7.7; affects power usage, but not budgeting */
1793 status
= clear_port_feature(hub
->hdev
,
1794 port1
, USB_PORT_FEAT_SUSPEND
);
1796 dev_dbg(hub
->intfdev
,
1797 "can't resume port %d, status %d\n",
1800 /* drive resume for at least 20 msec */
1802 dev_dbg(&udev
->dev
, "usb %sresume\n",
1803 udev
->auto_pm
? "auto-" : "");
1806 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1807 | USB_PORT_STAT_ENABLE \
1808 | USB_PORT_STAT_CONNECTION)
1810 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1811 * stop resume signaling. Then finish the resume
1814 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1817 || (portstatus
& LIVE_FLAGS
) != LIVE_FLAGS
1818 || (portstatus
& USB_PORT_STAT_SUSPEND
) != 0
1820 dev_dbg(hub
->intfdev
,
1821 "port %d status %04x.%04x after resume, %d\n",
1822 port1
, portchange
, portstatus
, status
);
1826 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1827 clear_port_feature(hub
->hdev
, port1
,
1828 USB_PORT_FEAT_C_SUSPEND
);
1829 /* TRSMRCY = 10 msec */
1832 status
= finish_port_resume(udev
);
1836 hub_port_logical_disconnect(hub
, port1
);
1838 clear_bit(port1
, hub
->busy_bits
);
1839 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
1840 usb_enable_root_hub_irq(hub
->hdev
->bus
);
1846 * usb_port_resume - re-activate a suspended usb device's upstream port
1847 * @udev: device to re-activate
1848 * Context: must be able to sleep; device not locked; pm locks held
1850 * This will re-activate the suspended device, increasing power usage
1851 * while letting drivers communicate again with its endpoints.
1852 * USB resume explicitly guarantees that the power session between
1853 * the host and the device is the same as it was when the device
1856 * Returns 0 on success, else negative errno.
1858 int usb_port_resume(struct usb_device
*udev
)
1862 /* we change the device's upstream USB link,
1863 * but root hubs have no upstream USB link.
1866 // NOTE this fails if parent is also suspended...
1867 status
= hub_port_resume(hdev_to_hub(udev
->parent
),
1868 udev
->portnum
, udev
);
1870 dev_dbg(&udev
->dev
, "usb %sresume\n",
1871 udev
->auto_pm
? "auto-" : "");
1872 status
= finish_port_resume(udev
);
1875 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
1879 static int remote_wakeup(struct usb_device
*udev
)
1883 usb_lock_device(udev
);
1884 if (udev
->state
== USB_STATE_SUSPENDED
) {
1885 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
1886 status
= usb_autoresume_device(udev
);
1888 /* Give the interface drivers a chance to do something,
1889 * then autosuspend the device again. */
1891 usb_autosuspend_device(udev
);
1893 usb_unlock_device(udev
);
1897 #else /* CONFIG_USB_SUSPEND */
1899 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1901 int usb_port_suspend(struct usb_device
*udev
)
1907 finish_port_resume(struct usb_device
*udev
)
1913 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1918 int usb_port_resume(struct usb_device
*udev
)
1923 static inline int remote_wakeup(struct usb_device
*udev
)
1930 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1932 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1933 struct usb_device
*hdev
= hub
->hdev
;
1936 /* fail if children aren't already suspended */
1937 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1938 struct usb_device
*udev
;
1940 udev
= hdev
->children
[port1
-1];
1941 if (udev
&& msg
.event
== PM_EVENT_SUSPEND
&&
1942 #ifdef CONFIG_USB_SUSPEND
1943 udev
->state
!= USB_STATE_SUSPENDED
1945 udev
->dev
.power
.power_state
.event
1950 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
1956 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1958 /* "global suspend" of the downstream HC-to-USB interface */
1959 if (!hdev
->parent
) {
1960 struct usb_bus
*bus
= hdev
->bus
;
1962 int status
= hcd_bus_suspend (bus
);
1965 dev_dbg(&hdev
->dev
, "'global' suspend %d\n",
1973 /* stop khubd and related activity */
1978 static int hub_resume(struct usb_interface
*intf
)
1980 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1981 struct usb_device
*hdev
= hub
->hdev
;
1984 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1986 /* "global resume" of the downstream HC-to-USB interface */
1987 if (!hdev
->parent
) {
1988 struct usb_bus
*bus
= hdev
->bus
;
1990 status
= hcd_bus_resume (bus
);
1992 dev_dbg(&intf
->dev
, "'global' resume %d\n",
1999 /* TRSMRCY = 10 msec */
2004 /* tell khubd to look for changes on this hub */
2009 #else /* CONFIG_PM */
2011 static inline int remote_wakeup(struct usb_device
*udev
)
2016 #define hub_suspend NULL
2017 #define hub_resume NULL
2020 void usb_resume_root_hub(struct usb_device
*hdev
)
2022 struct usb_hub
*hub
= hdev_to_hub(hdev
);
2028 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2030 * Between connect detection and reset signaling there must be a delay
2031 * of 100ms at least for debounce and power-settling. The corresponding
2032 * timer shall restart whenever the downstream port detects a disconnect.
2034 * Apparently there are some bluetooth and irda-dongles and a number of
2035 * low-speed devices for which this debounce period may last over a second.
2036 * Not covered by the spec - but easy to deal with.
2038 * This implementation uses a 1500ms total debounce timeout; if the
2039 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2040 * every 25ms for transient disconnects. When the port status has been
2041 * unchanged for 100ms it returns the port status.
2044 #define HUB_DEBOUNCE_TIMEOUT 1500
2045 #define HUB_DEBOUNCE_STEP 25
2046 #define HUB_DEBOUNCE_STABLE 100
2048 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2051 int total_time
, stable_time
= 0;
2052 u16 portchange
, portstatus
;
2053 unsigned connection
= 0xffff;
2055 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2056 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2060 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2061 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2062 stable_time
+= HUB_DEBOUNCE_STEP
;
2063 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2067 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2070 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2071 clear_port_feature(hub
->hdev
, port1
,
2072 USB_PORT_FEAT_C_CONNECTION
);
2075 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2077 msleep(HUB_DEBOUNCE_STEP
);
2080 dev_dbg (hub
->intfdev
,
2081 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2082 port1
, total_time
, stable_time
, portstatus
);
2084 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2089 static void ep0_reinit(struct usb_device
*udev
)
2091 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2092 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2093 udev
->ep_in
[0] = udev
->ep_out
[0] = &udev
->ep0
;
2096 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2097 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2099 static int hub_set_address(struct usb_device
*udev
)
2103 if (udev
->devnum
== 0)
2105 if (udev
->state
== USB_STATE_ADDRESS
)
2107 if (udev
->state
!= USB_STATE_DEFAULT
)
2109 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2110 USB_REQ_SET_ADDRESS
, 0, udev
->devnum
, 0,
2111 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2113 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2119 /* Reset device, (re)assign address, get device descriptor.
2120 * Device connection must be stable, no more debouncing needed.
2121 * Returns device in USB_STATE_ADDRESS, except on error.
2123 * If this is called for an already-existing device (as part of
2124 * usb_reset_device), the caller must own the device lock. For a
2125 * newly detected device that is not accessible through any global
2126 * pointers, it's not necessary to lock the device.
2129 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2132 static DEFINE_MUTEX(usb_address0_mutex
);
2134 struct usb_device
*hdev
= hub
->hdev
;
2136 unsigned delay
= HUB_SHORT_RESET_TIME
;
2137 enum usb_device_speed oldspeed
= udev
->speed
;
2140 /* root hub ports have a slightly longer reset period
2141 * (from USB 2.0 spec, section 7.1.7.5)
2143 if (!hdev
->parent
) {
2144 delay
= HUB_ROOT_RESET_TIME
;
2145 if (port1
== hdev
->bus
->otg_port
)
2146 hdev
->bus
->b_hnp_enable
= 0;
2149 /* Some low speed devices have problems with the quick delay, so */
2150 /* be a bit pessimistic with those devices. RHbug #23670 */
2151 if (oldspeed
== USB_SPEED_LOW
)
2152 delay
= HUB_LONG_RESET_TIME
;
2154 mutex_lock(&usb_address0_mutex
);
2156 /* Reset the device; full speed may morph to high speed */
2157 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2158 if (retval
< 0) /* error or disconnect */
2160 /* success, speed is known */
2163 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2164 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2167 oldspeed
= udev
->speed
;
2169 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2170 * it's fixed size except for full speed devices.
2171 * For Wireless USB devices, ep0 max packet is always 512 (tho
2172 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2174 switch (udev
->speed
) {
2175 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2176 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2178 case USB_SPEED_HIGH
: /* fixed at 64 */
2179 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2181 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2182 /* to determine the ep0 maxpacket size, try to read
2183 * the device descriptor to get bMaxPacketSize0 and
2184 * then correct our initial guess.
2186 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2188 case USB_SPEED_LOW
: /* fixed at 8 */
2189 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2196 switch (udev
->speed
) {
2197 case USB_SPEED_LOW
: speed
= "low"; break;
2198 case USB_SPEED_FULL
: speed
= "full"; break;
2199 case USB_SPEED_HIGH
: speed
= "high"; break;
2200 case USB_SPEED_VARIABLE
:
2204 default: speed
= "?"; break;
2206 dev_info (&udev
->dev
,
2207 "%s %s speed %sUSB device using %s and address %d\n",
2208 (udev
->config
) ? "reset" : "new", speed
, type
,
2209 udev
->bus
->controller
->driver
->name
, udev
->devnum
);
2211 /* Set up TT records, if needed */
2213 udev
->tt
= hdev
->tt
;
2214 udev
->ttport
= hdev
->ttport
;
2215 } else if (udev
->speed
!= USB_SPEED_HIGH
2216 && hdev
->speed
== USB_SPEED_HIGH
) {
2217 udev
->tt
= &hub
->tt
;
2218 udev
->ttport
= port1
;
2221 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2222 * Because device hardware and firmware is sometimes buggy in
2223 * this area, and this is how Linux has done it for ages.
2224 * Change it cautiously.
2226 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2227 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2228 * so it may help with some non-standards-compliant devices.
2229 * Otherwise we start with SET_ADDRESS and then try to read the
2230 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2233 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2234 if (USE_NEW_SCHEME(retry_counter
)) {
2235 struct usb_device_descriptor
*buf
;
2238 #define GET_DESCRIPTOR_BUFSIZE 64
2239 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2245 /* Use a short timeout the first time through,
2246 * so that recalcitrant full-speed devices with
2247 * 8- or 16-byte ep0-maxpackets won't slow things
2248 * down tremendously by NAKing the unexpectedly
2249 * early status stage. Also, retry on all errors;
2250 * some devices are flakey.
2251 * 255 is for WUSB devices, we actually need to use 512.
2254 for (j
= 0; j
< 3; ++j
) {
2255 buf
->bMaxPacketSize0
= 0;
2256 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2257 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2258 USB_DT_DEVICE
<< 8, 0,
2259 buf
, GET_DESCRIPTOR_BUFSIZE
,
2260 (i
? USB_CTRL_GET_TIMEOUT
: 1000));
2261 switch (buf
->bMaxPacketSize0
) {
2262 case 8: case 16: case 32: case 64: case 255:
2263 if (buf
->bDescriptorType
==
2277 udev
->descriptor
.bMaxPacketSize0
=
2278 buf
->bMaxPacketSize0
;
2281 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2282 if (retval
< 0) /* error or disconnect */
2284 if (oldspeed
!= udev
->speed
) {
2286 "device reset changed speed!\n");
2291 dev_err(&udev
->dev
, "device descriptor "
2292 "read/%s, error %d\n",
2297 #undef GET_DESCRIPTOR_BUFSIZE
2300 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2301 retval
= hub_set_address(udev
);
2308 "device not accepting address %d, error %d\n",
2309 udev
->devnum
, retval
);
2313 /* cope with hardware quirkiness:
2314 * - let SET_ADDRESS settle, some device hardware wants it
2315 * - read ep0 maxpacket even for high and low speed,
2318 if (USE_NEW_SCHEME(retry_counter
))
2321 retval
= usb_get_device_descriptor(udev
, 8);
2323 dev_err(&udev
->dev
, "device descriptor "
2324 "read/%s, error %d\n",
2336 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2337 512 : udev
->descriptor
.bMaxPacketSize0
;
2338 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2339 if (udev
->speed
!= USB_SPEED_FULL
||
2340 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2341 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2345 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2346 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2350 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2351 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2352 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2363 hub_port_disable(hub
, port1
, 0);
2364 mutex_unlock(&usb_address0_mutex
);
2369 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2371 struct usb_qualifier_descriptor
*qual
;
2374 qual
= kmalloc (sizeof *qual
, SLAB_KERNEL
);
2378 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2379 qual
, sizeof *qual
);
2380 if (status
== sizeof *qual
) {
2381 dev_info(&udev
->dev
, "not running at top speed; "
2382 "connect to a high speed hub\n");
2383 /* hub LEDs are probably harder to miss than syslog */
2384 if (hub
->has_indicators
) {
2385 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2386 schedule_delayed_work (&hub
->leds
, 0);
2393 hub_power_remaining (struct usb_hub
*hub
)
2395 struct usb_device
*hdev
= hub
->hdev
;
2399 if (!hub
->limited_power
)
2402 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2403 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2404 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2410 /* Unconfigured devices may not use more than 100mA,
2411 * or 8mA for OTG ports */
2412 if (udev
->actconfig
)
2413 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2414 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2418 if (delta
> hub
->mA_per_port
)
2419 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2421 delta
, hub
->mA_per_port
, port1
);
2424 if (remaining
< 0) {
2425 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2432 /* Handle physical or logical connection change events.
2433 * This routine is called when:
2434 * a port connection-change occurs;
2435 * a port enable-change occurs (often caused by EMI);
2436 * usb_reset_device() encounters changed descriptors (as from
2437 * a firmware download)
2438 * caller already locked the hub
2440 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2441 u16 portstatus
, u16 portchange
)
2443 struct usb_device
*hdev
= hub
->hdev
;
2444 struct device
*hub_dev
= hub
->intfdev
;
2445 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2449 "port %d, status %04x, change %04x, %s\n",
2450 port1
, portstatus
, portchange
, portspeed (portstatus
));
2452 if (hub
->has_indicators
) {
2453 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2454 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2457 /* Disconnect any existing devices under this port */
2458 if (hdev
->children
[port1
-1])
2459 usb_disconnect(&hdev
->children
[port1
-1]);
2460 clear_bit(port1
, hub
->change_bits
);
2462 #ifdef CONFIG_USB_OTG
2463 /* during HNP, don't repeat the debounce */
2464 if (hdev
->bus
->is_b_host
)
2465 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2468 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2469 status
= hub_port_debounce(hub
, port1
);
2472 "connect-debounce failed, port %d disabled\n",
2476 portstatus
= status
;
2479 /* Return now if nothing is connected */
2480 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2482 /* maybe switch power back on (e.g. root hub was reset) */
2483 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2484 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2485 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2487 if (portstatus
& USB_PORT_STAT_ENABLE
)
2492 #ifdef CONFIG_USB_SUSPEND
2493 /* If something is connected, but the port is suspended, wake it up. */
2494 if (portstatus
& USB_PORT_STAT_SUSPEND
) {
2495 status
= hub_port_resume(hub
, port1
, NULL
);
2498 "can't clear suspend on port %d; %d\n",
2505 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2506 struct usb_device
*udev
;
2508 /* reallocate for each attempt, since references
2509 * to the previous one can escape in various ways
2511 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2514 "couldn't allocate port %d usb_device\n",
2519 usb_set_device_state(udev
, USB_STATE_POWERED
);
2520 udev
->speed
= USB_SPEED_UNKNOWN
;
2521 udev
->bus_mA
= hub
->mA_per_port
;
2522 udev
->level
= hdev
->level
+ 1;
2524 /* set the address */
2525 choose_address(udev
);
2526 if (udev
->devnum
<= 0) {
2527 status
= -ENOTCONN
; /* Don't retry */
2531 /* reset and get descriptor */
2532 status
= hub_port_init(hub
, udev
, port1
, i
);
2536 /* consecutive bus-powered hubs aren't reliable; they can
2537 * violate the voltage drop budget. if the new child has
2538 * a "powered" LED, users should notice we didn't enable it
2539 * (without reading syslog), even without per-port LEDs
2542 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2543 && udev
->bus_mA
<= 100) {
2546 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2549 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2552 le16_to_cpus(&devstat
);
2553 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2555 "can't connect bus-powered hub "
2557 if (hub
->has_indicators
) {
2558 hub
->indicator
[port1
-1] =
2559 INDICATOR_AMBER_BLINK
;
2560 schedule_delayed_work (&hub
->leds
, 0);
2562 status
= -ENOTCONN
; /* Don't retry */
2567 /* check for devices running slower than they could */
2568 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2569 && udev
->speed
== USB_SPEED_FULL
2570 && highspeed_hubs
!= 0)
2571 check_highspeed (hub
, udev
, port1
);
2573 /* Store the parent's children[] pointer. At this point
2574 * udev becomes globally accessible, although presumably
2575 * no one will look at it until hdev is unlocked.
2579 /* We mustn't add new devices if the parent hub has
2580 * been disconnected; we would race with the
2581 * recursively_mark_NOTATTACHED() routine.
2583 spin_lock_irq(&device_state_lock
);
2584 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2587 hdev
->children
[port1
-1] = udev
;
2588 spin_unlock_irq(&device_state_lock
);
2590 /* Run it through the hoops (find a driver, etc) */
2592 status
= usb_new_device(udev
);
2594 spin_lock_irq(&device_state_lock
);
2595 hdev
->children
[port1
-1] = NULL
;
2596 spin_unlock_irq(&device_state_lock
);
2603 status
= hub_power_remaining(hub
);
2605 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2610 hub_port_disable(hub
, port1
, 1);
2613 release_address(udev
);
2615 if (status
== -ENOTCONN
)
2620 hub_port_disable(hub
, port1
, 1);
2623 static void hub_events(void)
2625 struct list_head
*tmp
;
2626 struct usb_device
*hdev
;
2627 struct usb_interface
*intf
;
2628 struct usb_hub
*hub
;
2629 struct device
*hub_dev
;
2638 * We restart the list every time to avoid a deadlock with
2639 * deleting hubs downstream from this one. This should be
2640 * safe since we delete the hub from the event list.
2641 * Not the most efficient, but avoids deadlocks.
2645 /* Grab the first entry at the beginning of the list */
2646 spin_lock_irq(&hub_event_lock
);
2647 if (list_empty(&hub_event_list
)) {
2648 spin_unlock_irq(&hub_event_lock
);
2652 tmp
= hub_event_list
.next
;
2655 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2657 intf
= to_usb_interface(hub
->intfdev
);
2658 hub_dev
= &intf
->dev
;
2660 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2661 hdev
->state
, hub
->descriptor
2662 ? hub
->descriptor
->bNbrPorts
2664 /* NOTE: expects max 15 ports... */
2665 (u16
) hub
->change_bits
[0],
2666 (u16
) hub
->event_bits
[0]);
2669 spin_unlock_irq(&hub_event_lock
);
2671 /* Lock the device, then check to see if we were
2672 * disconnected while waiting for the lock to succeed. */
2673 if (locktree(hdev
) < 0) {
2677 if (hub
!= usb_get_intfdata(intf
))
2680 /* If the hub has died, clean up after it */
2681 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2682 hub
->error
= -ENODEV
;
2683 hub_pre_reset(intf
);
2688 ret
= usb_autopm_get_interface(intf
);
2690 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2694 /* If this is an inactive hub, do nothing */
2699 dev_dbg (hub_dev
, "resetting for error %d\n",
2702 ret
= usb_reset_composite_device(hdev
, intf
);
2705 "error resetting hub: %d\n", ret
);
2713 /* deal with port status changes */
2714 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2715 if (test_bit(i
, hub
->busy_bits
))
2717 connect_change
= test_bit(i
, hub
->change_bits
);
2718 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2719 !connect_change
&& !hub
->activating
)
2722 ret
= hub_port_status(hub
, i
,
2723 &portstatus
, &portchange
);
2727 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2729 USB_PORT_STAT_CONNECTION
))
2732 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2733 clear_port_feature(hdev
, i
,
2734 USB_PORT_FEAT_C_CONNECTION
);
2738 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2739 if (!connect_change
)
2741 "port %d enable change, "
2744 clear_port_feature(hdev
, i
,
2745 USB_PORT_FEAT_C_ENABLE
);
2748 * EM interference sometimes causes badly
2749 * shielded USB devices to be shutdown by
2750 * the hub, this hack enables them again.
2751 * Works at least with mouse driver.
2753 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2755 && hdev
->children
[i
-1]) {
2758 "disabled by hub (EMI?), "
2765 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2766 clear_port_feature(hdev
, i
,
2767 USB_PORT_FEAT_C_SUSPEND
);
2768 if (hdev
->children
[i
-1]) {
2769 ret
= remote_wakeup(hdev
->
2775 hub_port_disable(hub
, i
, 1);
2778 "resume on port %d, status %d\n",
2782 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2784 "over-current change on port %d\n",
2786 clear_port_feature(hdev
, i
,
2787 USB_PORT_FEAT_C_OVER_CURRENT
);
2791 if (portchange
& USB_PORT_STAT_C_RESET
) {
2793 "reset change on port %d\n",
2795 clear_port_feature(hdev
, i
,
2796 USB_PORT_FEAT_C_RESET
);
2800 hub_port_connect_change(hub
, i
,
2801 portstatus
, portchange
);
2804 /* deal with hub status changes */
2805 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2807 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2808 dev_err (hub_dev
, "get_hub_status failed\n");
2810 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2811 dev_dbg (hub_dev
, "power change\n");
2812 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2813 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2814 /* FIXME: Is this always true? */
2815 hub
->limited_power
= 0;
2817 hub
->limited_power
= 1;
2819 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2820 dev_dbg (hub_dev
, "overcurrent change\n");
2821 msleep(500); /* Cool down */
2822 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2827 hub
->activating
= 0;
2829 /* If this is a root hub, tell the HCD it's okay to
2830 * re-enable port-change interrupts now. */
2831 if (!hdev
->parent
&& !hub
->busy_bits
[0])
2832 usb_enable_root_hub_irq(hdev
->bus
);
2835 /* Allow autosuspend if we're not going to run again */
2836 if (list_empty(&hub
->event_list
))
2837 usb_autopm_enable(intf
);
2839 usb_unlock_device(hdev
);
2842 } /* end while (1) */
2845 static int hub_thread(void *__unused
)
2849 wait_event_interruptible(khubd_wait
,
2850 !list_empty(&hub_event_list
) ||
2851 kthread_should_stop());
2853 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2855 pr_debug("%s: khubd exiting\n", usbcore_name
);
2859 static struct usb_device_id hub_id_table
[] = {
2860 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2861 .bDeviceClass
= USB_CLASS_HUB
},
2862 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2863 .bInterfaceClass
= USB_CLASS_HUB
},
2864 { } /* Terminating entry */
2867 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2869 static struct usb_driver hub_driver
= {
2872 .disconnect
= hub_disconnect
,
2873 .suspend
= hub_suspend
,
2874 .resume
= hub_resume
,
2875 .pre_reset
= hub_pre_reset
,
2876 .post_reset
= hub_post_reset
,
2878 .id_table
= hub_id_table
,
2879 .supports_autosuspend
= 1,
2882 int usb_hub_init(void)
2884 if (usb_register(&hub_driver
) < 0) {
2885 printk(KERN_ERR
"%s: can't register hub driver\n",
2890 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2891 if (!IS_ERR(khubd_task
))
2894 /* Fall through if kernel_thread failed */
2895 usb_deregister(&hub_driver
);
2896 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2901 void usb_hub_cleanup(void)
2903 kthread_stop(khubd_task
);
2906 * Hub resources are freed for us by usb_deregister. It calls
2907 * usb_driver_purge on every device which in turn calls that
2908 * devices disconnect function if it is using this driver.
2909 * The hub_disconnect function takes care of releasing the
2910 * individual hub resources. -greg
2912 usb_deregister(&hub_driver
);
2913 } /* usb_hub_cleanup() */
2915 static int config_descriptors_changed(struct usb_device
*udev
)
2919 struct usb_config_descriptor
*buf
;
2921 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2922 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2923 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2925 buf
= kmalloc (len
, SLAB_KERNEL
);
2927 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2928 /* assume the worst */
2931 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2933 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2935 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
2937 if (length
< old_length
) {
2938 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
2942 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
2944 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
2945 index
, buf
->bConfigurationValue
);
2950 return index
!= udev
->descriptor
.bNumConfigurations
;
2954 * usb_reset_device - perform a USB port reset to reinitialize a device
2955 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2957 * WARNING - don't use this routine to reset a composite device
2958 * (one with multiple interfaces owned by separate drivers)!
2959 * Use usb_reset_composite_device() instead.
2961 * Do a port reset, reassign the device's address, and establish its
2962 * former operating configuration. If the reset fails, or the device's
2963 * descriptors change from their values before the reset, or the original
2964 * configuration and altsettings cannot be restored, a flag will be set
2965 * telling khubd to pretend the device has been disconnected and then
2966 * re-connected. All drivers will be unbound, and the device will be
2967 * re-enumerated and probed all over again.
2969 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2970 * flagged for logical disconnection, or some other negative error code
2971 * if the reset wasn't even attempted.
2973 * The caller must own the device lock. For example, it's safe to use
2974 * this from a driver probe() routine after downloading new firmware.
2975 * For calls that might not occur during probe(), drivers should lock
2976 * the device using usb_lock_device_for_reset().
2978 int usb_reset_device(struct usb_device
*udev
)
2980 struct usb_device
*parent_hdev
= udev
->parent
;
2981 struct usb_hub
*parent_hub
;
2982 struct usb_device_descriptor descriptor
= udev
->descriptor
;
2984 int port1
= udev
->portnum
;
2986 if (udev
->state
== USB_STATE_NOTATTACHED
||
2987 udev
->state
== USB_STATE_SUSPENDED
) {
2988 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
2994 /* this requires hcd-specific logic; see OHCI hc_restart() */
2995 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
2998 parent_hub
= hdev_to_hub(parent_hdev
);
3000 set_bit(port1
, parent_hub
->busy_bits
);
3001 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3003 /* ep0 maxpacket size may change; let the HCD know about it.
3004 * Other endpoints will be handled by re-enumeration. */
3006 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3010 clear_bit(port1
, parent_hub
->busy_bits
);
3011 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
3012 usb_enable_root_hub_irq(parent_hdev
->bus
);
3017 /* Device might have changed firmware (DFU or similar) */
3018 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
3019 || config_descriptors_changed (udev
)) {
3020 dev_info(&udev
->dev
, "device firmware changed\n");
3021 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3025 if (!udev
->actconfig
)
3028 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3029 USB_REQ_SET_CONFIGURATION
, 0,
3030 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3031 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3034 "can't restore configuration #%d (error=%d)\n",
3035 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3038 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3040 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3041 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3042 struct usb_interface_descriptor
*desc
;
3044 /* set_interface resets host side toggle even
3045 * for altsetting zero. the interface may have no driver.
3047 desc
= &intf
->cur_altsetting
->desc
;
3048 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3049 desc
->bAlternateSetting
);
3051 dev_err(&udev
->dev
, "failed to restore interface %d "
3052 "altsetting %d (error=%d)\n",
3053 desc
->bInterfaceNumber
,
3054 desc
->bAlternateSetting
,
3064 hub_port_logical_disconnect(parent_hub
, port1
);
3067 EXPORT_SYMBOL(usb_reset_device
);
3070 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3071 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3072 * @iface: interface bound to the driver making the request (optional)
3074 * Warns all drivers bound to registered interfaces (using their pre_reset
3075 * method), performs the port reset, and then lets the drivers know that
3076 * the reset is over (using their post_reset method).
3078 * Return value is the same as for usb_reset_device().
3080 * The caller must own the device lock. For example, it's safe to use
3081 * this from a driver probe() routine after downloading new firmware.
3082 * For calls that might not occur during probe(), drivers should lock
3083 * the device using usb_lock_device_for_reset().
3085 * The interface locks are acquired during the pre_reset stage and released
3086 * during the post_reset stage. However if iface is not NULL and is
3087 * currently being probed, we assume that the caller already owns its
3090 int usb_reset_composite_device(struct usb_device
*udev
,
3091 struct usb_interface
*iface
)
3094 struct usb_host_config
*config
= udev
->actconfig
;
3096 if (udev
->state
== USB_STATE_NOTATTACHED
||
3097 udev
->state
== USB_STATE_SUSPENDED
) {
3098 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3103 /* Prevent autosuspend during the reset */
3104 usb_autoresume_device(udev
);
3106 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3111 struct usb_interface
*cintf
;
3112 struct usb_driver
*drv
;
3114 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3115 cintf
= config
->interface
[i
];
3117 down(&cintf
->dev
.sem
);
3118 if (device_is_registered(&cintf
->dev
) &&
3119 cintf
->dev
.driver
) {
3120 drv
= to_usb_driver(cintf
->dev
.driver
);
3122 (drv
->pre_reset
)(cintf
);
3127 ret
= usb_reset_device(udev
);
3131 struct usb_interface
*cintf
;
3132 struct usb_driver
*drv
;
3134 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3135 cintf
= config
->interface
[i
];
3136 if (device_is_registered(&cintf
->dev
) &&
3137 cintf
->dev
.driver
) {
3138 drv
= to_usb_driver(cintf
->dev
.driver
);
3139 if (drv
->post_reset
)
3140 (drv
->post_reset
)(cintf
);
3143 up(&cintf
->dev
.sem
);
3147 usb_autosuspend_device(udev
);
3150 EXPORT_SYMBOL(usb_reset_composite_device
);