4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/kthread.h>
23 #include <linux/mutex.h>
24 #include <linux/freezer.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 */
46 struct mutex status_mutex
; /* for the status buffer */
48 int error
; /* last reported error */
49 int nerrors
; /* track consecutive errors */
51 struct list_head event_list
; /* hubs w/data or errs ready */
52 unsigned long event_bits
[1]; /* status change bitmask */
53 unsigned long change_bits
[1]; /* ports with logical connect
55 unsigned long busy_bits
[1]; /* ports being reset or
57 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
58 #error event_bits[] is too short!
61 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
62 struct usb_tt tt
; /* Transaction Translator */
64 unsigned mA_per_port
; /* current for each child */
66 unsigned limited_power
:1;
68 unsigned activating
:1;
70 unsigned has_indicators
:1;
71 u8 indicator
[USB_MAXCHILDREN
];
72 struct delayed_work leds
;
76 /* Protect struct usb_device->state and ->children members
77 * Note: Both are also protected by ->dev.sem, except that ->state can
78 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
79 static DEFINE_SPINLOCK(device_state_lock
);
81 /* khubd's worklist and its lock */
82 static DEFINE_SPINLOCK(hub_event_lock
);
83 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
86 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
88 static struct task_struct
*khubd_task
;
90 /* cycle leds on hubs that aren't blinking for attention */
91 static int blinkenlights
= 0;
92 module_param (blinkenlights
, bool, S_IRUGO
);
93 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
96 * As of 2.6.10 we introduce a new USB device initialization scheme which
97 * closely resembles the way Windows works. Hopefully it will be compatible
98 * with a wider range of devices than the old scheme. However some previously
99 * working devices may start giving rise to "device not accepting address"
100 * errors; if that happens the user can try the old scheme by adjusting the
101 * following module parameters.
103 * For maximum flexibility there are two boolean parameters to control the
104 * hub driver's behavior. On the first initialization attempt, if the
105 * "old_scheme_first" parameter is set then the old scheme will be used,
106 * otherwise the new scheme is used. If that fails and "use_both_schemes"
107 * is set, then the driver will make another attempt, using the other scheme.
109 static int old_scheme_first
= 0;
110 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
111 MODULE_PARM_DESC(old_scheme_first
,
112 "start with the old device initialization scheme");
114 static int use_both_schemes
= 1;
115 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
116 MODULE_PARM_DESC(use_both_schemes
,
117 "try the other device initialization scheme if the "
121 static inline char *portspeed(int portstatus
)
123 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
125 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
131 /* Note that hdev or one of its children must be locked! */
132 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
134 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
137 /* USB 2.0 spec Section 11.24.4.5 */
138 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
142 for (i
= 0; i
< 3; i
++) {
143 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
144 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
145 USB_DT_HUB
<< 8, 0, data
, size
,
146 USB_CTRL_GET_TIMEOUT
);
147 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
154 * USB 2.0 spec Section 11.24.2.1
156 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
158 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
159 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
163 * USB 2.0 spec Section 11.24.2.2
165 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
167 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
168 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
173 * USB 2.0 spec Section 11.24.2.13
175 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
177 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
178 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
183 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
184 * for info about using port indicators
186 static void set_port_led(
192 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
193 USB_PORT_FEAT_INDICATOR
);
195 dev_dbg (hub
->intfdev
,
196 "port %d indicator %s status %d\n",
198 ({ char *s
; switch (selector
) {
199 case HUB_LED_AMBER
: s
= "amber"; break;
200 case HUB_LED_GREEN
: s
= "green"; break;
201 case HUB_LED_OFF
: s
= "off"; break;
202 case HUB_LED_AUTO
: s
= "auto"; break;
203 default: s
= "??"; break;
208 #define LED_CYCLE_PERIOD ((2*HZ)/3)
210 static void led_work (struct work_struct
*work
)
212 struct usb_hub
*hub
=
213 container_of(work
, struct usb_hub
, leds
.work
);
214 struct usb_device
*hdev
= hub
->hdev
;
216 unsigned changed
= 0;
219 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
222 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
223 unsigned selector
, mode
;
225 /* 30%-50% duty cycle */
227 switch (hub
->indicator
[i
]) {
229 case INDICATOR_CYCLE
:
231 selector
= HUB_LED_AUTO
;
232 mode
= INDICATOR_AUTO
;
234 /* blinking green = sw attention */
235 case INDICATOR_GREEN_BLINK
:
236 selector
= HUB_LED_GREEN
;
237 mode
= INDICATOR_GREEN_BLINK_OFF
;
239 case INDICATOR_GREEN_BLINK_OFF
:
240 selector
= HUB_LED_OFF
;
241 mode
= INDICATOR_GREEN_BLINK
;
243 /* blinking amber = hw attention */
244 case INDICATOR_AMBER_BLINK
:
245 selector
= HUB_LED_AMBER
;
246 mode
= INDICATOR_AMBER_BLINK_OFF
;
248 case INDICATOR_AMBER_BLINK_OFF
:
249 selector
= HUB_LED_OFF
;
250 mode
= INDICATOR_AMBER_BLINK
;
252 /* blink green/amber = reserved */
253 case INDICATOR_ALT_BLINK
:
254 selector
= HUB_LED_GREEN
;
255 mode
= INDICATOR_ALT_BLINK_OFF
;
257 case INDICATOR_ALT_BLINK_OFF
:
258 selector
= HUB_LED_AMBER
;
259 mode
= INDICATOR_ALT_BLINK
;
264 if (selector
!= HUB_LED_AUTO
)
266 set_port_led(hub
, i
+ 1, selector
);
267 hub
->indicator
[i
] = mode
;
269 if (!changed
&& blinkenlights
) {
271 cursor
%= hub
->descriptor
->bNbrPorts
;
272 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
273 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
277 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
280 /* use a short timeout for hub/port status fetches */
281 #define USB_STS_TIMEOUT 1000
282 #define USB_STS_RETRIES 5
285 * USB 2.0 spec Section 11.24.2.6
287 static int get_hub_status(struct usb_device
*hdev
,
288 struct usb_hub_status
*data
)
290 int i
, status
= -ETIMEDOUT
;
292 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
293 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
294 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
295 data
, sizeof(*data
), USB_STS_TIMEOUT
);
301 * USB 2.0 spec Section 11.24.2.7
303 static int get_port_status(struct usb_device
*hdev
, int port1
,
304 struct usb_port_status
*data
)
306 int i
, status
= -ETIMEDOUT
;
308 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
309 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
310 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
311 data
, sizeof(*data
), USB_STS_TIMEOUT
);
316 static void kick_khubd(struct usb_hub
*hub
)
320 /* Suppress autosuspend until khubd runs */
321 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
323 spin_lock_irqsave(&hub_event_lock
, flags
);
324 if (list_empty(&hub
->event_list
)) {
325 list_add_tail(&hub
->event_list
, &hub_event_list
);
326 wake_up(&khubd_wait
);
328 spin_unlock_irqrestore(&hub_event_lock
, flags
);
331 void usb_kick_khubd(struct usb_device
*hdev
)
333 kick_khubd(hdev_to_hub(hdev
));
337 /* completion function, fires on port status changes and various faults */
338 static void hub_irq(struct urb
*urb
)
340 struct usb_hub
*hub
= urb
->context
;
345 switch (urb
->status
) {
346 case -ENOENT
: /* synchronous unlink */
347 case -ECONNRESET
: /* async unlink */
348 case -ESHUTDOWN
: /* hardware going away */
351 default: /* presumably an error */
352 /* Cause a hub reset after 10 consecutive errors */
353 dev_dbg (hub
->intfdev
, "transfer --> %d\n", urb
->status
);
354 if ((++hub
->nerrors
< 10) || hub
->error
)
356 hub
->error
= urb
->status
;
359 /* let khubd handle things */
360 case 0: /* we got data: port status changed */
362 for (i
= 0; i
< urb
->actual_length
; ++i
)
363 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
365 hub
->event_bits
[0] = bits
;
371 /* Something happened, let khubd figure it out */
378 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
379 && status
!= -ENODEV
&& status
!= -EPERM
)
380 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
383 /* USB 2.0 spec Section 11.24.2.3 */
385 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
387 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
388 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
393 * enumeration blocks khubd for a long time. we use keventd instead, since
394 * long blocking there is the exception, not the rule. accordingly, HCDs
395 * talking to TTs must queue control transfers (not just bulk and iso), so
396 * both can talk to the same hub concurrently.
398 static void hub_tt_kevent (struct work_struct
*work
)
400 struct usb_hub
*hub
=
401 container_of(work
, struct usb_hub
, tt
.kevent
);
404 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
405 while (!list_empty (&hub
->tt
.clear_list
)) {
406 struct list_head
*temp
;
407 struct usb_tt_clear
*clear
;
408 struct usb_device
*hdev
= hub
->hdev
;
411 temp
= hub
->tt
.clear_list
.next
;
412 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
413 list_del (&clear
->clear_list
);
415 /* drop lock so HCD can concurrently report other TT errors */
416 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
417 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
418 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
422 "clear tt %d (%04x) error %d\n",
423 clear
->tt
, clear
->devinfo
, status
);
426 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
430 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
431 * @udev: the device whose split transaction failed
432 * @pipe: identifies the endpoint of the failed transaction
434 * High speed HCDs use this to tell the hub driver that some split control or
435 * bulk transaction failed in a way that requires clearing internal state of
436 * a transaction translator. This is normally detected (and reported) from
439 * It may not be possible for that hub to handle additional full (or low)
440 * speed transactions until that state is fully cleared out.
442 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
444 struct usb_tt
*tt
= udev
->tt
;
446 struct usb_tt_clear
*clear
;
448 /* we've got to cope with an arbitrary number of pending TT clears,
449 * since each TT has "at least two" buffers that can need it (and
450 * there can be many TTs per hub). even if they're uncommon.
452 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
453 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
454 /* FIXME recover somehow ... RESET_TT? */
458 /* info that CLEAR_TT_BUFFER needs */
459 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
460 clear
->devinfo
= usb_pipeendpoint (pipe
);
461 clear
->devinfo
|= udev
->devnum
<< 4;
462 clear
->devinfo
|= usb_pipecontrol (pipe
)
463 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
464 : (USB_ENDPOINT_XFER_BULK
<< 11);
465 if (usb_pipein (pipe
))
466 clear
->devinfo
|= 1 << 15;
468 /* tell keventd to clear state for this TT */
469 spin_lock_irqsave (&tt
->lock
, flags
);
470 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
471 schedule_work (&tt
->kevent
);
472 spin_unlock_irqrestore (&tt
->lock
, flags
);
475 static void hub_power_on(struct usb_hub
*hub
)
478 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
479 u16 wHubCharacteristics
=
480 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
482 /* Enable power on each port. Some hubs have reserved values
483 * of LPSM (> 2) in their descriptors, even though they are
484 * USB 2.0 hubs. Some hubs do not implement port-power switching
485 * but only emulate it. In all cases, the ports won't work
486 * unless we send these messages to the hub.
488 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
489 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
491 dev_dbg(hub
->intfdev
, "trying to enable port power on "
492 "non-switchable hub\n");
493 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
494 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
496 /* Wait at least 100 msec for power to become stable */
497 msleep(max(pgood_delay
, (unsigned) 100));
500 static void hub_quiesce(struct usb_hub
*hub
)
502 /* (nonblocking) khubd and related activity won't re-trigger */
506 /* (blocking) stop khubd and related activity */
507 usb_kill_urb(hub
->urb
);
508 if (hub
->has_indicators
)
509 cancel_delayed_work(&hub
->leds
);
510 if (hub
->has_indicators
|| hub
->tt
.hub
)
511 flush_scheduled_work();
514 static void hub_activate(struct usb_hub
*hub
)
521 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
523 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
524 if (hub
->has_indicators
&& blinkenlights
)
525 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
527 /* scan all ports ASAP */
531 static int hub_hub_status(struct usb_hub
*hub
,
532 u16
*status
, u16
*change
)
536 mutex_lock(&hub
->status_mutex
);
537 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
539 dev_err (hub
->intfdev
,
540 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
542 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
543 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
546 mutex_unlock(&hub
->status_mutex
);
550 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
552 struct usb_device
*hdev
= hub
->hdev
;
555 if (hdev
->children
[port1
-1] && set_state
) {
556 usb_set_device_state(hdev
->children
[port1
-1],
557 USB_STATE_NOTATTACHED
);
559 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
561 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
568 /* caller has locked the hub device */
569 static void hub_pre_reset(struct usb_interface
*intf
)
571 struct usb_hub
*hub
= usb_get_intfdata(intf
);
572 struct usb_device
*hdev
= hub
->hdev
;
575 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
576 if (hdev
->children
[port1
- 1]) {
577 usb_disconnect(&hdev
->children
[port1
- 1]);
579 hub_port_disable(hub
, port1
, 0);
585 /* caller has locked the hub device */
586 static void hub_post_reset(struct usb_interface
*intf
)
588 struct usb_hub
*hub
= usb_get_intfdata(intf
);
595 static int hub_configure(struct usb_hub
*hub
,
596 struct usb_endpoint_descriptor
*endpoint
)
598 struct usb_device
*hdev
= hub
->hdev
;
599 struct device
*hub_dev
= hub
->intfdev
;
600 u16 hubstatus
, hubchange
;
601 u16 wHubCharacteristics
;
606 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
609 message
= "can't allocate hub irq buffer";
614 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
616 message
= "can't kmalloc hub status buffer";
620 mutex_init(&hub
->status_mutex
);
622 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
623 if (!hub
->descriptor
) {
624 message
= "can't kmalloc hub descriptor";
629 /* Request the entire hub descriptor.
630 * hub->descriptor can handle USB_MAXCHILDREN ports,
631 * but the hub can/will return fewer bytes here.
633 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
634 sizeof(*hub
->descriptor
));
636 message
= "can't read hub descriptor";
638 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
639 message
= "hub has too many ports!";
644 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
645 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
646 (hdev
->maxchild
== 1) ? "" : "s");
648 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
650 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
652 char portstr
[USB_MAXCHILDREN
+ 1];
654 for (i
= 0; i
< hdev
->maxchild
; i
++)
655 portstr
[i
] = hub
->descriptor
->DeviceRemovable
656 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
658 portstr
[hdev
->maxchild
] = 0;
659 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
661 dev_dbg(hub_dev
, "standalone hub\n");
663 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
665 dev_dbg(hub_dev
, "ganged power switching\n");
668 dev_dbg(hub_dev
, "individual port power switching\n");
672 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
676 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
678 dev_dbg(hub_dev
, "global over-current protection\n");
681 dev_dbg(hub_dev
, "individual port over-current protection\n");
685 dev_dbg(hub_dev
, "no over-current protection\n");
689 spin_lock_init (&hub
->tt
.lock
);
690 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
691 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
);
692 switch (hdev
->descriptor
.bDeviceProtocol
) {
696 dev_dbg(hub_dev
, "Single TT\n");
700 ret
= usb_set_interface(hdev
, 0, 1);
702 dev_dbg(hub_dev
, "TT per port\n");
705 dev_err(hub_dev
, "Using single TT (err %d)\n",
710 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
711 hdev
->descriptor
.bDeviceProtocol
);
715 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
716 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
717 case HUB_TTTT_8_BITS
:
718 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
719 hub
->tt
.think_time
= 666;
720 dev_dbg(hub_dev
, "TT requires at most %d "
721 "FS bit times (%d ns)\n",
722 8, hub
->tt
.think_time
);
725 case HUB_TTTT_16_BITS
:
726 hub
->tt
.think_time
= 666 * 2;
727 dev_dbg(hub_dev
, "TT requires at most %d "
728 "FS bit times (%d ns)\n",
729 16, hub
->tt
.think_time
);
731 case HUB_TTTT_24_BITS
:
732 hub
->tt
.think_time
= 666 * 3;
733 dev_dbg(hub_dev
, "TT requires at most %d "
734 "FS bit times (%d ns)\n",
735 24, hub
->tt
.think_time
);
737 case HUB_TTTT_32_BITS
:
738 hub
->tt
.think_time
= 666 * 4;
739 dev_dbg(hub_dev
, "TT requires at most %d "
740 "FS bit times (%d ns)\n",
741 32, hub
->tt
.think_time
);
745 /* probe() zeroes hub->indicator[] */
746 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
747 hub
->has_indicators
= 1;
748 dev_dbg(hub_dev
, "Port indicators are supported\n");
751 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
752 hub
->descriptor
->bPwrOn2PwrGood
* 2);
754 /* power budgeting mostly matters with bus-powered hubs,
755 * and battery-powered root hubs (may provide just 8 mA).
757 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
759 message
= "can't get hub status";
762 le16_to_cpus(&hubstatus
);
763 if (hdev
== hdev
->bus
->root_hub
) {
764 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
765 hub
->mA_per_port
= 500;
767 hub
->mA_per_port
= hdev
->bus_mA
;
768 hub
->limited_power
= 1;
770 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
771 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
772 hub
->descriptor
->bHubContrCurrent
);
773 hub
->limited_power
= 1;
774 if (hdev
->maxchild
> 0) {
775 int remaining
= hdev
->bus_mA
-
776 hub
->descriptor
->bHubContrCurrent
;
778 if (remaining
< hdev
->maxchild
* 100)
780 "insufficient power available "
781 "to use all downstream ports\n");
782 hub
->mA_per_port
= 100; /* 7.2.1.1 */
784 } else { /* Self-powered external hub */
785 /* FIXME: What about battery-powered external hubs that
786 * provide less current per port? */
787 hub
->mA_per_port
= 500;
789 if (hub
->mA_per_port
< 500)
790 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
793 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
795 message
= "can't get hub status";
799 /* local power status reports aren't always correct */
800 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
801 dev_dbg(hub_dev
, "local power source is %s\n",
802 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
803 ? "lost (inactive)" : "good");
805 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
806 dev_dbg(hub_dev
, "%sover-current condition exists\n",
807 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
809 /* set up the interrupt endpoint
810 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
811 * bytes as USB2.0[11.12.3] says because some hubs are known
812 * to send more data (and thus cause overflow). For root hubs,
813 * maxpktsize is defined in hcd.c's fake endpoint descriptors
814 * to be big enough for at least USB_MAXCHILDREN ports. */
815 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
816 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
818 if (maxp
> sizeof(*hub
->buffer
))
819 maxp
= sizeof(*hub
->buffer
);
821 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
823 message
= "couldn't allocate interrupt urb";
828 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
829 hub
, endpoint
->bInterval
);
830 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
831 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
833 /* maybe cycle the hub leds */
834 if (hub
->has_indicators
&& blinkenlights
)
835 hub
->indicator
[0] = INDICATOR_CYCLE
;
842 dev_err (hub_dev
, "config failed, %s (err %d)\n",
844 /* hub_disconnect() frees urb and descriptor */
848 static unsigned highspeed_hubs
;
850 static void hub_disconnect(struct usb_interface
*intf
)
852 struct usb_hub
*hub
= usb_get_intfdata (intf
);
853 struct usb_device
*hdev
;
855 /* Disconnect all children and quiesce the hub */
859 usb_set_intfdata (intf
, NULL
);
862 if (hdev
->speed
== USB_SPEED_HIGH
)
865 usb_free_urb(hub
->urb
);
868 spin_lock_irq(&hub_event_lock
);
869 list_del_init(&hub
->event_list
);
870 spin_unlock_irq(&hub_event_lock
);
872 kfree(hub
->descriptor
);
873 hub
->descriptor
= NULL
;
879 usb_buffer_free(hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
887 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
889 struct usb_host_interface
*desc
;
890 struct usb_endpoint_descriptor
*endpoint
;
891 struct usb_device
*hdev
;
894 desc
= intf
->cur_altsetting
;
895 hdev
= interface_to_usbdev(intf
);
897 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
899 dev_warn(&intf
->dev
, "ignoring external hub\n");
904 /* Some hubs have a subclass of 1, which AFAICT according to the */
905 /* specs is not defined, but it works */
906 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
907 (desc
->desc
.bInterfaceSubClass
!= 1)) {
909 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
913 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
914 if (desc
->desc
.bNumEndpoints
!= 1)
915 goto descriptor_error
;
917 endpoint
= &desc
->endpoint
[0].desc
;
919 /* If it's not an interrupt in endpoint, we'd better punt! */
920 if (!usb_endpoint_is_int_in(endpoint
))
921 goto descriptor_error
;
924 dev_info (&intf
->dev
, "USB hub found\n");
926 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
928 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
932 INIT_LIST_HEAD(&hub
->event_list
);
933 hub
->intfdev
= &intf
->dev
;
935 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
937 usb_set_intfdata (intf
, hub
);
938 intf
->needs_remote_wakeup
= 1;
940 if (hdev
->speed
== USB_SPEED_HIGH
)
943 if (hub_configure(hub
, endpoint
) >= 0)
946 hub_disconnect (intf
);
951 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
953 struct usb_device
*hdev
= interface_to_usbdev (intf
);
955 /* assert ifno == 0 (part of hub spec) */
957 case USBDEVFS_HUB_PORTINFO
: {
958 struct usbdevfs_hub_portinfo
*info
= user_data
;
961 spin_lock_irq(&device_state_lock
);
962 if (hdev
->devnum
<= 0)
965 info
->nports
= hdev
->maxchild
;
966 for (i
= 0; i
< info
->nports
; i
++) {
967 if (hdev
->children
[i
] == NULL
)
971 hdev
->children
[i
]->devnum
;
974 spin_unlock_irq(&device_state_lock
);
976 return info
->nports
+ 1;
985 /* grab device/port lock, returning index of that port (zero based).
986 * protects the upstream link used by this device from concurrent
987 * tree operations like suspend, resume, reset, and disconnect, which
988 * apply to everything downstream of a given port.
990 static int locktree(struct usb_device
*udev
)
993 struct usb_device
*hdev
;
998 /* root hub is always the first lock in the series */
1001 usb_lock_device(udev
);
1005 /* on the path from root to us, lock everything from
1006 * top down, dropping parent locks when not needed
1012 /* everything is fail-fast once disconnect
1015 if (udev
->state
== USB_STATE_NOTATTACHED
) {
1016 usb_unlock_device(hdev
);
1020 /* when everyone grabs locks top->bottom,
1021 * non-overlapping work may be concurrent
1023 usb_lock_device(udev
);
1024 usb_unlock_device(hdev
);
1025 return udev
->portnum
;
1028 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1032 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1033 if (udev
->children
[i
])
1034 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1036 if (udev
->state
== USB_STATE_SUSPENDED
)
1037 udev
->discon_suspended
= 1;
1038 udev
->state
= USB_STATE_NOTATTACHED
;
1042 * usb_set_device_state - change a device's current state (usbcore, hcds)
1043 * @udev: pointer to device whose state should be changed
1044 * @new_state: new state value to be stored
1046 * udev->state is _not_ fully protected by the device lock. Although
1047 * most transitions are made only while holding the lock, the state can
1048 * can change to USB_STATE_NOTATTACHED at almost any time. This
1049 * is so that devices can be marked as disconnected as soon as possible,
1050 * without having to wait for any semaphores to be released. As a result,
1051 * all changes to any device's state must be protected by the
1052 * device_state_lock spinlock.
1054 * Once a device has been added to the device tree, all changes to its state
1055 * should be made using this routine. The state should _not_ be set directly.
1057 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1058 * Otherwise udev->state is set to new_state, and if new_state is
1059 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1060 * to USB_STATE_NOTATTACHED.
1062 void usb_set_device_state(struct usb_device
*udev
,
1063 enum usb_device_state new_state
)
1065 unsigned long flags
;
1067 spin_lock_irqsave(&device_state_lock
, flags
);
1068 if (udev
->state
== USB_STATE_NOTATTACHED
)
1070 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1072 /* root hub wakeup capabilities are managed out-of-band
1073 * and may involve silicon errata ... ignore them here.
1076 if (udev
->state
== USB_STATE_SUSPENDED
1077 || new_state
== USB_STATE_SUSPENDED
)
1078 ; /* No change to wakeup settings */
1079 else if (new_state
== USB_STATE_CONFIGURED
)
1080 device_init_wakeup(&udev
->dev
,
1081 (udev
->actconfig
->desc
.bmAttributes
1082 & USB_CONFIG_ATT_WAKEUP
));
1084 device_init_wakeup(&udev
->dev
, 0);
1086 udev
->state
= new_state
;
1088 recursively_mark_NOTATTACHED(udev
);
1089 spin_unlock_irqrestore(&device_state_lock
, flags
);
1096 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1097 * @rhdev: struct usb_device for the root hub
1099 * The USB host controller driver calls this function when its root hub
1100 * is resumed and Vbus power has been interrupted or the controller
1101 * has been reset. The routine marks all the children of the root hub
1102 * as NOTATTACHED and marks logical connect-change events on their ports.
1104 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
1106 struct usb_hub
*hub
;
1108 unsigned long flags
;
1110 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
1112 /* Make sure no potential wakeup events get lost,
1113 * by forcing the root hub to be resumed.
1115 rhdev
->dev
.power
.prev_state
.event
= PM_EVENT_ON
;
1117 spin_lock_irqsave(&device_state_lock
, flags
);
1118 hub
= hdev_to_hub(rhdev
);
1119 for (port1
= 1; port1
<= rhdev
->maxchild
; ++port1
) {
1120 if (rhdev
->children
[port1
- 1]) {
1121 recursively_mark_NOTATTACHED(
1122 rhdev
->children
[port1
- 1]);
1123 set_bit(port1
, hub
->change_bits
);
1126 spin_unlock_irqrestore(&device_state_lock
, flags
);
1128 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
1130 #endif /* CONFIG_PM */
1132 static void choose_address(struct usb_device
*udev
)
1135 struct usb_bus
*bus
= udev
->bus
;
1137 /* If khubd ever becomes multithreaded, this will need a lock */
1139 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1140 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1143 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1145 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1148 set_bit(devnum
, bus
->devmap
.devicemap
);
1149 udev
->devnum
= devnum
;
1153 static void release_address(struct usb_device
*udev
)
1155 if (udev
->devnum
> 0) {
1156 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1161 #ifdef CONFIG_USB_SUSPEND
1163 static void usb_stop_pm(struct usb_device
*udev
)
1165 /* Synchronize with the ksuspend thread to prevent any more
1166 * autosuspend requests from being submitted, and decrement
1167 * the parent's count of unsuspended children.
1170 if (udev
->parent
&& !udev
->discon_suspended
)
1171 usb_autosuspend_device(udev
->parent
);
1172 usb_pm_unlock(udev
);
1174 /* Stop any autosuspend requests already submitted */
1175 cancel_rearming_delayed_work(&udev
->autosuspend
);
1180 static inline void usb_stop_pm(struct usb_device
*udev
)
1186 * usb_disconnect - disconnect a device (usbcore-internal)
1187 * @pdev: pointer to device being disconnected
1188 * Context: !in_interrupt ()
1190 * Something got disconnected. Get rid of it and all of its children.
1192 * If *pdev is a normal device then the parent hub must already be locked.
1193 * If *pdev is a root hub then this routine will acquire the
1194 * usb_bus_list_lock on behalf of the caller.
1196 * Only hub drivers (including virtual root hub drivers for host
1197 * controllers) should ever call this.
1199 * This call is synchronous, and may not be used in an interrupt context.
1201 void usb_disconnect(struct usb_device
**pdev
)
1203 struct usb_device
*udev
= *pdev
;
1207 pr_debug ("%s nodev\n", __FUNCTION__
);
1211 /* mark the device as inactive, so any further urb submissions for
1212 * this device (and any of its children) will fail immediately.
1213 * this quiesces everyting except pending urbs.
1215 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1216 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1218 usb_lock_device(udev
);
1220 /* Free up all the children before we remove this device */
1221 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1222 if (udev
->children
[i
])
1223 usb_disconnect(&udev
->children
[i
]);
1226 /* deallocate hcd/hardware state ... nuking all pending urbs and
1227 * cleaning up all state associated with the current configuration
1228 * so that the hardware is now fully quiesced.
1230 dev_dbg (&udev
->dev
, "unregistering device\n");
1231 usb_disable_device(udev
, 0);
1233 usb_unlock_device(udev
);
1235 /* Unregister the device. The device driver is responsible
1236 * for removing the device files from usbfs and sysfs and for
1237 * de-configuring the device.
1239 device_del(&udev
->dev
);
1241 /* Free the device number and delete the parent's children[]
1242 * (or root_hub) pointer.
1244 release_address(udev
);
1246 /* Avoid races with recursively_mark_NOTATTACHED() */
1247 spin_lock_irq(&device_state_lock
);
1249 spin_unlock_irq(&device_state_lock
);
1253 put_device(&udev
->dev
);
1257 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1261 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1265 static inline void show_string(struct usb_device
*udev
, char *id
, char *string
)
1270 #ifdef CONFIG_USB_OTG
1271 #include "otg_whitelist.h"
1272 static int __usb_port_suspend(struct usb_device
*, int port1
);
1276 * usb_new_device - perform initial device setup (usbcore-internal)
1277 * @udev: newly addressed device (in ADDRESS state)
1279 * This is called with devices which have been enumerated, but not yet
1280 * configured. The device descriptor is available, but not descriptors
1281 * for any device configuration. The caller must have locked either
1282 * the parent hub (if udev is a normal device) or else the
1283 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1284 * udev has already been installed, but udev is not yet visible through
1285 * sysfs or other filesystem code.
1287 * It will return if the device is configured properly or not. Zero if
1288 * the interface was registered with the driver core; else a negative
1291 * This call is synchronous, and may not be used in an interrupt context.
1293 * Only the hub driver or root-hub registrar should ever call this.
1295 int usb_new_device(struct usb_device
*udev
)
1299 /* Determine quirks */
1300 usb_detect_quirks(udev
);
1302 err
= usb_get_configuration(udev
);
1304 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1309 /* read the standard strings and cache them if present */
1310 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1311 udev
->manufacturer
= usb_cache_string(udev
,
1312 udev
->descriptor
.iManufacturer
);
1313 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1315 /* Tell the world! */
1316 dev_dbg(&udev
->dev
, "new device strings: Mfr=%d, Product=%d, "
1317 "SerialNumber=%d\n",
1318 udev
->descriptor
.iManufacturer
,
1319 udev
->descriptor
.iProduct
,
1320 udev
->descriptor
.iSerialNumber
);
1321 show_string(udev
, "Product", udev
->product
);
1322 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1323 show_string(udev
, "SerialNumber", udev
->serial
);
1325 #ifdef CONFIG_USB_OTG
1327 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1328 * to wake us after we've powered off VBUS; and HNP, switching roles
1329 * "host" to "peripheral". The OTG descriptor helps figure this out.
1331 if (!udev
->bus
->is_b_host
1333 && udev
->parent
== udev
->bus
->root_hub
) {
1334 struct usb_otg_descriptor
*desc
= 0;
1335 struct usb_bus
*bus
= udev
->bus
;
1337 /* descriptor may appear anywhere in config */
1338 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1339 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1340 USB_DT_OTG
, (void **) &desc
) == 0) {
1341 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1342 unsigned port1
= udev
->portnum
;
1344 dev_info(&udev
->dev
,
1345 "Dual-Role OTG device on %sHNP port\n",
1346 (port1
== bus
->otg_port
)
1349 /* enable HNP before suspend, it's simpler */
1350 if (port1
== bus
->otg_port
)
1351 bus
->b_hnp_enable
= 1;
1352 err
= usb_control_msg(udev
,
1353 usb_sndctrlpipe(udev
, 0),
1354 USB_REQ_SET_FEATURE
, 0,
1356 ? USB_DEVICE_B_HNP_ENABLE
1357 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1358 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1360 /* OTG MESSAGE: report errors here,
1361 * customize to match your product.
1363 dev_info(&udev
->dev
,
1364 "can't set HNP mode; %d\n",
1366 bus
->b_hnp_enable
= 0;
1372 if (!is_targeted(udev
)) {
1374 /* Maybe it can talk to us, though we can't talk to it.
1375 * (Includes HNP test device.)
1377 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1378 err
= __usb_port_suspend(udev
, udev
->bus
->otg_port
);
1380 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1387 /* export the usbdev device-node for libusb */
1388 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1389 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1391 /* Register the device. The device driver is responsible
1392 * for adding the device files to sysfs and for configuring
1395 err
= device_add(&udev
->dev
);
1397 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1401 /* Increment the parent's count of unsuspended children */
1403 usb_autoresume_device(udev
->parent
);
1409 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1413 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1414 u16
*status
, u16
*change
)
1418 mutex_lock(&hub
->status_mutex
);
1419 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1421 dev_err (hub
->intfdev
,
1422 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1426 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1427 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1430 mutex_unlock(&hub
->status_mutex
);
1435 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1436 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1438 struct usb_hcd
*hcd
;
1439 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1441 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1442 return hcd
->wireless
;
1446 #define PORT_RESET_TRIES 5
1447 #define SET_ADDRESS_TRIES 2
1448 #define GET_DESCRIPTOR_TRIES 2
1449 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1450 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1452 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1453 #define HUB_SHORT_RESET_TIME 10
1454 #define HUB_LONG_RESET_TIME 200
1455 #define HUB_RESET_TIMEOUT 500
1457 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1458 struct usb_device
*udev
, unsigned int delay
)
1460 int delay_time
, ret
;
1464 for (delay_time
= 0;
1465 delay_time
< HUB_RESET_TIMEOUT
;
1466 delay_time
+= delay
) {
1467 /* wait to give the device a chance to reset */
1470 /* read and decode port status */
1471 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1475 /* Device went away? */
1476 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1479 /* bomb out completely if something weird happened */
1480 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1483 /* if we`ve finished resetting, then break out of the loop */
1484 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1485 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1486 if (hub_is_wusb(hub
))
1487 udev
->speed
= USB_SPEED_VARIABLE
;
1488 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1489 udev
->speed
= USB_SPEED_HIGH
;
1490 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1491 udev
->speed
= USB_SPEED_LOW
;
1493 udev
->speed
= USB_SPEED_FULL
;
1497 /* switch to the long delay after two short delay failures */
1498 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1499 delay
= HUB_LONG_RESET_TIME
;
1501 dev_dbg (hub
->intfdev
,
1502 "port %d not reset yet, waiting %dms\n",
1509 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1510 struct usb_device
*udev
, unsigned int delay
)
1514 /* Reset the port */
1515 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1516 status
= set_port_feature(hub
->hdev
,
1517 port1
, USB_PORT_FEAT_RESET
);
1519 dev_err(hub
->intfdev
,
1520 "cannot reset port %d (err = %d)\n",
1523 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1524 if (status
&& status
!= -ENOTCONN
)
1525 dev_dbg(hub
->intfdev
,
1526 "port_wait_reset: err = %d\n",
1530 /* return on disconnect or reset */
1533 /* TRSTRCY = 10 ms; plus some extra */
1538 clear_port_feature(hub
->hdev
,
1539 port1
, USB_PORT_FEAT_C_RESET
);
1540 /* FIXME need disconnect() for NOTATTACHED device */
1541 usb_set_device_state(udev
, status
1542 ? USB_STATE_NOTATTACHED
1543 : USB_STATE_DEFAULT
);
1547 dev_dbg (hub
->intfdev
,
1548 "port %d not enabled, trying reset again...\n",
1550 delay
= HUB_LONG_RESET_TIME
;
1553 dev_err (hub
->intfdev
,
1554 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1561 * Disable a port and mark a logical connnect-change event, so that some
1562 * time later khubd will disconnect() any existing usb_device on the port
1563 * and will re-enumerate if there actually is a device attached.
1565 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
1567 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
1568 hub_port_disable(hub
, port1
, 1);
1570 /* FIXME let caller ask to power down the port:
1571 * - some devices won't enumerate without a VBUS power cycle
1572 * - SRP saves power that way
1573 * - ... new call, TBD ...
1574 * That's easy if this hub can switch power per-port, and
1575 * khubd reactivates the port later (timer, SRP, etc).
1576 * Powerdown must be optional, because of reset/DFU.
1579 set_bit(port1
, hub
->change_bits
);
1585 #ifdef CONFIG_USB_SUSPEND
1588 * Selective port suspend reduces power; most suspended devices draw
1589 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1590 * All devices below the suspended port are also suspended.
1592 * Devices leave suspend state when the host wakes them up. Some devices
1593 * also support "remote wakeup", where the device can activate the USB
1594 * tree above them to deliver data, such as a keypress or packet. In
1595 * some cases, this wakes the USB host.
1597 static int hub_port_suspend(struct usb_hub
*hub
, int port1
,
1598 struct usb_device
*udev
)
1602 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1604 /* enable remote wakeup when appropriate; this lets the device
1605 * wake up the upstream hub (including maybe the root hub).
1607 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1608 * we don't explicitly enable it here.
1610 if (udev
->do_remote_wakeup
) {
1611 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1612 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1613 USB_DEVICE_REMOTE_WAKEUP
, 0,
1615 USB_CTRL_SET_TIMEOUT
);
1618 "won't remote wakeup, status %d\n",
1623 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1625 dev_dbg(hub
->intfdev
,
1626 "can't suspend port %d, status %d\n",
1628 /* paranoia: "should not happen" */
1629 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1630 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1631 USB_DEVICE_REMOTE_WAKEUP
, 0,
1633 USB_CTRL_SET_TIMEOUT
);
1635 /* device has up to 10 msec to fully suspend */
1636 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1637 udev
->auto_pm
? "auto-" : "");
1638 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1645 * Devices on USB hub ports have only one "suspend" state, corresponding
1646 * to ACPI D2, "may cause the device to lose some context".
1647 * State transitions include:
1649 * - suspend, resume ... when the VBUS power link stays live
1650 * - suspend, disconnect ... VBUS lost
1652 * Once VBUS drop breaks the circuit, the port it's using has to go through
1653 * normal re-enumeration procedures, starting with enabling VBUS power.
1654 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1655 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1656 * timer, no SRP, no requests through sysfs.
1658 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1659 * the root hub for their bus goes into global suspend ... so we don't
1660 * (falsely) update the device power state to say it suspended.
1662 static int __usb_port_suspend (struct usb_device
*udev
, int port1
)
1666 /* caller owns the udev device lock */
1670 /* we change the device's upstream USB link,
1671 * but root hubs have no upstream USB link.
1674 status
= hub_port_suspend(hdev_to_hub(udev
->parent
), port1
,
1677 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1678 udev
->auto_pm
? "auto-" : "");
1679 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1685 * usb_port_suspend - suspend a usb device's upstream port
1686 * @udev: device that's no longer in active use
1687 * Context: must be able to sleep; device not locked; pm locks held
1689 * Suspends a USB device that isn't in active use, conserving power.
1690 * Devices may wake out of a suspend, if anything important happens,
1691 * using the remote wakeup mechanism. They may also be taken out of
1692 * suspend by the host, using usb_port_resume(). It's also routine
1693 * to disconnect devices while they are suspended.
1695 * This only affects the USB hardware for a device; its interfaces
1696 * (and, for hubs, child devices) must already have been suspended.
1698 * Suspending OTG devices may trigger HNP, if that's been enabled
1699 * between a pair of dual-role devices. That will change roles, such
1700 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1702 * Returns 0 on success, else negative errno.
1704 int usb_port_suspend(struct usb_device
*udev
)
1706 return __usb_port_suspend(udev
, udev
->portnum
);
1710 * If the USB "suspend" state is in use (rather than "global suspend"),
1711 * many devices will be individually taken out of suspend state using
1712 * special" resume" signaling. These routines kick in shortly after
1713 * hardware resume signaling is finished, either because of selective
1714 * resume (by host) or remote wakeup (by device) ... now see what changed
1715 * in the tree that's rooted at this device.
1717 static int finish_port_resume(struct usb_device
*udev
)
1722 /* caller owns the udev device lock */
1723 dev_dbg(&udev
->dev
, "finish resume\n");
1725 /* usb ch9 identifies four variants of SUSPENDED, based on what
1726 * state the device resumes to. Linux currently won't see the
1727 * first two on the host side; they'd be inside hub_port_init()
1728 * during many timeouts, but khubd can't suspend until later.
1730 usb_set_device_state(udev
, udev
->actconfig
1731 ? USB_STATE_CONFIGURED
1732 : USB_STATE_ADDRESS
);
1734 /* 10.5.4.5 says be sure devices in the tree are still there.
1735 * For now let's assume the device didn't go crazy on resume,
1736 * and device drivers will know about any resume quirks.
1738 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1740 status
= (status
== 2 ? 0 : -ENODEV
);
1744 "gone after usb resume? status %d\n",
1746 else if (udev
->actconfig
) {
1747 le16_to_cpus(&devstatus
);
1748 if ((devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
1750 status
= usb_control_msg(udev
,
1751 usb_sndctrlpipe(udev
, 0),
1752 USB_REQ_CLEAR_FEATURE
,
1754 USB_DEVICE_REMOTE_WAKEUP
, 0,
1756 USB_CTRL_SET_TIMEOUT
);
1758 dev_dbg(&udev
->dev
, "disable remote "
1759 "wakeup, status %d\n", status
);
1763 } else if (udev
->devnum
<= 0) {
1764 dev_dbg(&udev
->dev
, "bogus resume!\n");
1771 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1774 u16 portchange
, portstatus
;
1776 /* Skip the initial Clear-Suspend step for a remote wakeup */
1777 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1778 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
1779 goto SuspendCleared
;
1781 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1783 set_bit(port1
, hub
->busy_bits
);
1785 /* see 7.1.7.7; affects power usage, but not budgeting */
1786 status
= clear_port_feature(hub
->hdev
,
1787 port1
, USB_PORT_FEAT_SUSPEND
);
1789 dev_dbg(hub
->intfdev
,
1790 "can't resume port %d, status %d\n",
1793 /* drive resume for at least 20 msec */
1795 dev_dbg(&udev
->dev
, "usb %sresume\n",
1796 udev
->auto_pm
? "auto-" : "");
1799 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1800 | USB_PORT_STAT_ENABLE \
1801 | USB_PORT_STAT_CONNECTION)
1803 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1804 * stop resume signaling. Then finish the resume
1807 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1810 || (portstatus
& LIVE_FLAGS
) != LIVE_FLAGS
1811 || (portstatus
& USB_PORT_STAT_SUSPEND
) != 0
1813 dev_dbg(hub
->intfdev
,
1814 "port %d status %04x.%04x after resume, %d\n",
1815 port1
, portchange
, portstatus
, status
);
1819 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1820 clear_port_feature(hub
->hdev
, port1
,
1821 USB_PORT_FEAT_C_SUSPEND
);
1822 /* TRSMRCY = 10 msec */
1825 status
= finish_port_resume(udev
);
1829 hub_port_logical_disconnect(hub
, port1
);
1831 clear_bit(port1
, hub
->busy_bits
);
1832 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
1833 usb_enable_root_hub_irq(hub
->hdev
->bus
);
1839 * usb_port_resume - re-activate a suspended usb device's upstream port
1840 * @udev: device to re-activate
1841 * Context: must be able to sleep; device not locked; pm locks held
1843 * This will re-activate the suspended device, increasing power usage
1844 * while letting drivers communicate again with its endpoints.
1845 * USB resume explicitly guarantees that the power session between
1846 * the host and the device is the same as it was when the device
1849 * Returns 0 on success, else negative errno.
1851 int usb_port_resume(struct usb_device
*udev
)
1855 /* we change the device's upstream USB link,
1856 * but root hubs have no upstream USB link.
1859 // NOTE this fails if parent is also suspended...
1860 status
= hub_port_resume(hdev_to_hub(udev
->parent
),
1861 udev
->portnum
, udev
);
1863 dev_dbg(&udev
->dev
, "usb %sresume\n",
1864 udev
->auto_pm
? "auto-" : "");
1865 status
= finish_port_resume(udev
);
1868 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
1872 static int remote_wakeup(struct usb_device
*udev
)
1876 usb_lock_device(udev
);
1877 if (udev
->state
== USB_STATE_SUSPENDED
) {
1878 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
1879 usb_mark_last_busy(udev
);
1880 status
= usb_external_resume_device(udev
);
1882 usb_unlock_device(udev
);
1886 #else /* CONFIG_USB_SUSPEND */
1888 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1890 int usb_port_suspend(struct usb_device
*udev
)
1896 finish_port_resume(struct usb_device
*udev
)
1902 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1907 int usb_port_resume(struct usb_device
*udev
)
1912 static inline int remote_wakeup(struct usb_device
*udev
)
1919 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1921 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1922 struct usb_device
*hdev
= hub
->hdev
;
1926 /* fail if children aren't already suspended */
1927 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1928 struct usb_device
*udev
;
1930 udev
= hdev
->children
[port1
-1];
1931 if (udev
&& msg
.event
== PM_EVENT_SUSPEND
&&
1932 #ifdef CONFIG_USB_SUSPEND
1933 udev
->state
!= USB_STATE_SUSPENDED
1935 udev
->dev
.power
.power_state
.event
1940 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
1946 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1948 /* stop khubd and related activity */
1951 /* "global suspend" of the downstream HC-to-USB interface */
1952 if (!hdev
->parent
) {
1953 status
= hcd_bus_suspend(hdev
->bus
);
1955 dev_dbg(&hdev
->dev
, "'global' suspend %d\n", status
);
1962 static int hub_resume(struct usb_interface
*intf
)
1964 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1965 struct usb_device
*hdev
= hub
->hdev
;
1968 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1970 /* "global resume" of the downstream HC-to-USB interface */
1971 if (!hdev
->parent
) {
1972 struct usb_bus
*bus
= hdev
->bus
;
1974 status
= hcd_bus_resume (bus
);
1976 dev_dbg(&intf
->dev
, "'global' resume %d\n",
1983 /* TRSMRCY = 10 msec */
1988 /* tell khubd to look for changes on this hub */
1993 #else /* CONFIG_PM */
1995 static inline int remote_wakeup(struct usb_device
*udev
)
2000 #define hub_suspend NULL
2001 #define hub_resume NULL
2005 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2007 * Between connect detection and reset signaling there must be a delay
2008 * of 100ms at least for debounce and power-settling. The corresponding
2009 * timer shall restart whenever the downstream port detects a disconnect.
2011 * Apparently there are some bluetooth and irda-dongles and a number of
2012 * low-speed devices for which this debounce period may last over a second.
2013 * Not covered by the spec - but easy to deal with.
2015 * This implementation uses a 1500ms total debounce timeout; if the
2016 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2017 * every 25ms for transient disconnects. When the port status has been
2018 * unchanged for 100ms it returns the port status.
2021 #define HUB_DEBOUNCE_TIMEOUT 1500
2022 #define HUB_DEBOUNCE_STEP 25
2023 #define HUB_DEBOUNCE_STABLE 100
2025 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2028 int total_time
, stable_time
= 0;
2029 u16 portchange
, portstatus
;
2030 unsigned connection
= 0xffff;
2032 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2033 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2037 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2038 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2039 stable_time
+= HUB_DEBOUNCE_STEP
;
2040 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2044 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2047 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2048 clear_port_feature(hub
->hdev
, port1
,
2049 USB_PORT_FEAT_C_CONNECTION
);
2052 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2054 msleep(HUB_DEBOUNCE_STEP
);
2057 dev_dbg (hub
->intfdev
,
2058 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2059 port1
, total_time
, stable_time
, portstatus
);
2061 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2066 static void ep0_reinit(struct usb_device
*udev
)
2068 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2069 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2070 udev
->ep_in
[0] = udev
->ep_out
[0] = &udev
->ep0
;
2073 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2074 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2076 static int hub_set_address(struct usb_device
*udev
)
2080 if (udev
->devnum
== 0)
2082 if (udev
->state
== USB_STATE_ADDRESS
)
2084 if (udev
->state
!= USB_STATE_DEFAULT
)
2086 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2087 USB_REQ_SET_ADDRESS
, 0, udev
->devnum
, 0,
2088 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2090 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2096 /* Reset device, (re)assign address, get device descriptor.
2097 * Device connection must be stable, no more debouncing needed.
2098 * Returns device in USB_STATE_ADDRESS, except on error.
2100 * If this is called for an already-existing device (as part of
2101 * usb_reset_device), the caller must own the device lock. For a
2102 * newly detected device that is not accessible through any global
2103 * pointers, it's not necessary to lock the device.
2106 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2109 static DEFINE_MUTEX(usb_address0_mutex
);
2111 struct usb_device
*hdev
= hub
->hdev
;
2113 unsigned delay
= HUB_SHORT_RESET_TIME
;
2114 enum usb_device_speed oldspeed
= udev
->speed
;
2117 /* root hub ports have a slightly longer reset period
2118 * (from USB 2.0 spec, section 7.1.7.5)
2120 if (!hdev
->parent
) {
2121 delay
= HUB_ROOT_RESET_TIME
;
2122 if (port1
== hdev
->bus
->otg_port
)
2123 hdev
->bus
->b_hnp_enable
= 0;
2126 /* Some low speed devices have problems with the quick delay, so */
2127 /* be a bit pessimistic with those devices. RHbug #23670 */
2128 if (oldspeed
== USB_SPEED_LOW
)
2129 delay
= HUB_LONG_RESET_TIME
;
2131 mutex_lock(&usb_address0_mutex
);
2133 /* Reset the device; full speed may morph to high speed */
2134 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2135 if (retval
< 0) /* error or disconnect */
2137 /* success, speed is known */
2140 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2141 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2144 oldspeed
= udev
->speed
;
2146 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2147 * it's fixed size except for full speed devices.
2148 * For Wireless USB devices, ep0 max packet is always 512 (tho
2149 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2151 switch (udev
->speed
) {
2152 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2153 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2155 case USB_SPEED_HIGH
: /* fixed at 64 */
2156 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2158 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2159 /* to determine the ep0 maxpacket size, try to read
2160 * the device descriptor to get bMaxPacketSize0 and
2161 * then correct our initial guess.
2163 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2165 case USB_SPEED_LOW
: /* fixed at 8 */
2166 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2173 switch (udev
->speed
) {
2174 case USB_SPEED_LOW
: speed
= "low"; break;
2175 case USB_SPEED_FULL
: speed
= "full"; break;
2176 case USB_SPEED_HIGH
: speed
= "high"; break;
2177 case USB_SPEED_VARIABLE
:
2181 default: speed
= "?"; break;
2183 dev_info (&udev
->dev
,
2184 "%s %s speed %sUSB device using %s and address %d\n",
2185 (udev
->config
) ? "reset" : "new", speed
, type
,
2186 udev
->bus
->controller
->driver
->name
, udev
->devnum
);
2188 /* Set up TT records, if needed */
2190 udev
->tt
= hdev
->tt
;
2191 udev
->ttport
= hdev
->ttport
;
2192 } else if (udev
->speed
!= USB_SPEED_HIGH
2193 && hdev
->speed
== USB_SPEED_HIGH
) {
2194 udev
->tt
= &hub
->tt
;
2195 udev
->ttport
= port1
;
2198 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2199 * Because device hardware and firmware is sometimes buggy in
2200 * this area, and this is how Linux has done it for ages.
2201 * Change it cautiously.
2203 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2204 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2205 * so it may help with some non-standards-compliant devices.
2206 * Otherwise we start with SET_ADDRESS and then try to read the
2207 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2210 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2211 if (USE_NEW_SCHEME(retry_counter
)) {
2212 struct usb_device_descriptor
*buf
;
2215 #define GET_DESCRIPTOR_BUFSIZE 64
2216 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2222 /* Retry on all errors; some devices are flakey.
2223 * 255 is for WUSB devices, we actually need to use
2224 * 512 (WUSB1.0[4.8.1]).
2226 for (j
= 0; j
< 3; ++j
) {
2227 buf
->bMaxPacketSize0
= 0;
2228 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2229 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2230 USB_DT_DEVICE
<< 8, 0,
2231 buf
, GET_DESCRIPTOR_BUFSIZE
,
2232 USB_CTRL_GET_TIMEOUT
);
2233 switch (buf
->bMaxPacketSize0
) {
2234 case 8: case 16: case 32: case 64: case 255:
2235 if (buf
->bDescriptorType
==
2249 udev
->descriptor
.bMaxPacketSize0
=
2250 buf
->bMaxPacketSize0
;
2253 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2254 if (retval
< 0) /* error or disconnect */
2256 if (oldspeed
!= udev
->speed
) {
2258 "device reset changed speed!\n");
2263 dev_err(&udev
->dev
, "device descriptor "
2264 "read/%s, error %d\n",
2269 #undef GET_DESCRIPTOR_BUFSIZE
2272 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2273 retval
= hub_set_address(udev
);
2280 "device not accepting address %d, error %d\n",
2281 udev
->devnum
, retval
);
2285 /* cope with hardware quirkiness:
2286 * - let SET_ADDRESS settle, some device hardware wants it
2287 * - read ep0 maxpacket even for high and low speed,
2290 if (USE_NEW_SCHEME(retry_counter
))
2293 retval
= usb_get_device_descriptor(udev
, 8);
2295 dev_err(&udev
->dev
, "device descriptor "
2296 "read/%s, error %d\n",
2308 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2309 512 : udev
->descriptor
.bMaxPacketSize0
;
2310 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2311 if (udev
->speed
!= USB_SPEED_FULL
||
2312 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2313 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2317 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2318 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2322 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2323 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2324 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2335 hub_port_disable(hub
, port1
, 0);
2336 mutex_unlock(&usb_address0_mutex
);
2341 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2343 struct usb_qualifier_descriptor
*qual
;
2346 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2350 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2351 qual
, sizeof *qual
);
2352 if (status
== sizeof *qual
) {
2353 dev_info(&udev
->dev
, "not running at top speed; "
2354 "connect to a high speed hub\n");
2355 /* hub LEDs are probably harder to miss than syslog */
2356 if (hub
->has_indicators
) {
2357 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2358 schedule_delayed_work (&hub
->leds
, 0);
2365 hub_power_remaining (struct usb_hub
*hub
)
2367 struct usb_device
*hdev
= hub
->hdev
;
2371 if (!hub
->limited_power
)
2374 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2375 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2376 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2382 /* Unconfigured devices may not use more than 100mA,
2383 * or 8mA for OTG ports */
2384 if (udev
->actconfig
)
2385 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2386 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2390 if (delta
> hub
->mA_per_port
)
2391 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2393 delta
, hub
->mA_per_port
, port1
);
2396 if (remaining
< 0) {
2397 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2404 /* Handle physical or logical connection change events.
2405 * This routine is called when:
2406 * a port connection-change occurs;
2407 * a port enable-change occurs (often caused by EMI);
2408 * usb_reset_device() encounters changed descriptors (as from
2409 * a firmware download)
2410 * caller already locked the hub
2412 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2413 u16 portstatus
, u16 portchange
)
2415 struct usb_device
*hdev
= hub
->hdev
;
2416 struct device
*hub_dev
= hub
->intfdev
;
2417 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2421 "port %d, status %04x, change %04x, %s\n",
2422 port1
, portstatus
, portchange
, portspeed (portstatus
));
2424 if (hub
->has_indicators
) {
2425 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2426 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2429 /* Disconnect any existing devices under this port */
2430 if (hdev
->children
[port1
-1])
2431 usb_disconnect(&hdev
->children
[port1
-1]);
2432 clear_bit(port1
, hub
->change_bits
);
2434 #ifdef CONFIG_USB_OTG
2435 /* during HNP, don't repeat the debounce */
2436 if (hdev
->bus
->is_b_host
)
2437 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2440 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2441 status
= hub_port_debounce(hub
, port1
);
2443 if (printk_ratelimit())
2444 dev_err (hub_dev
, "connect-debounce failed, "
2445 "port %d disabled\n", port1
);
2448 portstatus
= status
;
2451 /* Return now if nothing is connected */
2452 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2454 /* maybe switch power back on (e.g. root hub was reset) */
2455 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2456 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2457 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2459 if (portstatus
& USB_PORT_STAT_ENABLE
)
2464 #ifdef CONFIG_USB_SUSPEND
2465 /* If something is connected, but the port is suspended, wake it up. */
2466 if (portstatus
& USB_PORT_STAT_SUSPEND
) {
2467 status
= hub_port_resume(hub
, port1
, NULL
);
2470 "can't clear suspend on port %d; %d\n",
2477 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2478 struct usb_device
*udev
;
2480 /* reallocate for each attempt, since references
2481 * to the previous one can escape in various ways
2483 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2486 "couldn't allocate port %d usb_device\n",
2491 usb_set_device_state(udev
, USB_STATE_POWERED
);
2492 udev
->speed
= USB_SPEED_UNKNOWN
;
2493 udev
->bus_mA
= hub
->mA_per_port
;
2494 udev
->level
= hdev
->level
+ 1;
2496 /* set the address */
2497 choose_address(udev
);
2498 if (udev
->devnum
<= 0) {
2499 status
= -ENOTCONN
; /* Don't retry */
2503 /* reset and get descriptor */
2504 status
= hub_port_init(hub
, udev
, port1
, i
);
2508 /* consecutive bus-powered hubs aren't reliable; they can
2509 * violate the voltage drop budget. if the new child has
2510 * a "powered" LED, users should notice we didn't enable it
2511 * (without reading syslog), even without per-port LEDs
2514 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2515 && udev
->bus_mA
<= 100) {
2518 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2521 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2524 le16_to_cpus(&devstat
);
2525 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2527 "can't connect bus-powered hub "
2529 if (hub
->has_indicators
) {
2530 hub
->indicator
[port1
-1] =
2531 INDICATOR_AMBER_BLINK
;
2532 schedule_delayed_work (&hub
->leds
, 0);
2534 status
= -ENOTCONN
; /* Don't retry */
2539 /* check for devices running slower than they could */
2540 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2541 && udev
->speed
== USB_SPEED_FULL
2542 && highspeed_hubs
!= 0)
2543 check_highspeed (hub
, udev
, port1
);
2545 /* Store the parent's children[] pointer. At this point
2546 * udev becomes globally accessible, although presumably
2547 * no one will look at it until hdev is unlocked.
2551 /* We mustn't add new devices if the parent hub has
2552 * been disconnected; we would race with the
2553 * recursively_mark_NOTATTACHED() routine.
2555 spin_lock_irq(&device_state_lock
);
2556 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2559 hdev
->children
[port1
-1] = udev
;
2560 spin_unlock_irq(&device_state_lock
);
2562 /* Run it through the hoops (find a driver, etc) */
2564 status
= usb_new_device(udev
);
2566 spin_lock_irq(&device_state_lock
);
2567 hdev
->children
[port1
-1] = NULL
;
2568 spin_unlock_irq(&device_state_lock
);
2575 status
= hub_power_remaining(hub
);
2577 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2582 hub_port_disable(hub
, port1
, 1);
2585 release_address(udev
);
2587 if (status
== -ENOTCONN
)
2592 hub_port_disable(hub
, port1
, 1);
2595 static void hub_events(void)
2597 struct list_head
*tmp
;
2598 struct usb_device
*hdev
;
2599 struct usb_interface
*intf
;
2600 struct usb_hub
*hub
;
2601 struct device
*hub_dev
;
2610 * We restart the list every time to avoid a deadlock with
2611 * deleting hubs downstream from this one. This should be
2612 * safe since we delete the hub from the event list.
2613 * Not the most efficient, but avoids deadlocks.
2617 /* Grab the first entry at the beginning of the list */
2618 spin_lock_irq(&hub_event_lock
);
2619 if (list_empty(&hub_event_list
)) {
2620 spin_unlock_irq(&hub_event_lock
);
2624 tmp
= hub_event_list
.next
;
2627 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2629 intf
= to_usb_interface(hub
->intfdev
);
2630 hub_dev
= &intf
->dev
;
2632 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2633 hdev
->state
, hub
->descriptor
2634 ? hub
->descriptor
->bNbrPorts
2636 /* NOTE: expects max 15 ports... */
2637 (u16
) hub
->change_bits
[0],
2638 (u16
) hub
->event_bits
[0]);
2641 spin_unlock_irq(&hub_event_lock
);
2643 /* Lock the device, then check to see if we were
2644 * disconnected while waiting for the lock to succeed. */
2645 if (locktree(hdev
) < 0) {
2649 if (hub
!= usb_get_intfdata(intf
))
2652 /* If the hub has died, clean up after it */
2653 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2654 hub
->error
= -ENODEV
;
2655 hub_pre_reset(intf
);
2660 ret
= usb_autopm_get_interface(intf
);
2662 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2666 /* If this is an inactive hub, do nothing */
2671 dev_dbg (hub_dev
, "resetting for error %d\n",
2674 ret
= usb_reset_composite_device(hdev
, intf
);
2677 "error resetting hub: %d\n", ret
);
2685 /* deal with port status changes */
2686 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2687 if (test_bit(i
, hub
->busy_bits
))
2689 connect_change
= test_bit(i
, hub
->change_bits
);
2690 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2691 !connect_change
&& !hub
->activating
)
2694 ret
= hub_port_status(hub
, i
,
2695 &portstatus
, &portchange
);
2699 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2701 USB_PORT_STAT_CONNECTION
))
2704 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2705 clear_port_feature(hdev
, i
,
2706 USB_PORT_FEAT_C_CONNECTION
);
2710 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2711 if (!connect_change
)
2713 "port %d enable change, "
2716 clear_port_feature(hdev
, i
,
2717 USB_PORT_FEAT_C_ENABLE
);
2720 * EM interference sometimes causes badly
2721 * shielded USB devices to be shutdown by
2722 * the hub, this hack enables them again.
2723 * Works at least with mouse driver.
2725 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2727 && hdev
->children
[i
-1]) {
2730 "disabled by hub (EMI?), "
2737 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2738 clear_port_feature(hdev
, i
,
2739 USB_PORT_FEAT_C_SUSPEND
);
2740 if (hdev
->children
[i
-1]) {
2741 ret
= remote_wakeup(hdev
->
2747 hub_port_disable(hub
, i
, 1);
2750 "resume on port %d, status %d\n",
2754 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2756 "over-current change on port %d\n",
2758 clear_port_feature(hdev
, i
,
2759 USB_PORT_FEAT_C_OVER_CURRENT
);
2763 if (portchange
& USB_PORT_STAT_C_RESET
) {
2765 "reset change on port %d\n",
2767 clear_port_feature(hdev
, i
,
2768 USB_PORT_FEAT_C_RESET
);
2772 hub_port_connect_change(hub
, i
,
2773 portstatus
, portchange
);
2776 /* deal with hub status changes */
2777 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2779 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2780 dev_err (hub_dev
, "get_hub_status failed\n");
2782 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2783 dev_dbg (hub_dev
, "power change\n");
2784 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2785 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2786 /* FIXME: Is this always true? */
2787 hub
->limited_power
= 0;
2789 hub
->limited_power
= 1;
2791 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2792 dev_dbg (hub_dev
, "overcurrent change\n");
2793 msleep(500); /* Cool down */
2794 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2799 hub
->activating
= 0;
2801 /* If this is a root hub, tell the HCD it's okay to
2802 * re-enable port-change interrupts now. */
2803 if (!hdev
->parent
&& !hub
->busy_bits
[0])
2804 usb_enable_root_hub_irq(hdev
->bus
);
2807 /* Allow autosuspend if we're not going to run again */
2808 if (list_empty(&hub
->event_list
))
2809 usb_autopm_enable(intf
);
2811 usb_unlock_device(hdev
);
2814 } /* end while (1) */
2817 static int hub_thread(void *__unused
)
2821 wait_event_interruptible(khubd_wait
,
2822 !list_empty(&hub_event_list
) ||
2823 kthread_should_stop());
2825 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2827 pr_debug("%s: khubd exiting\n", usbcore_name
);
2831 static struct usb_device_id hub_id_table
[] = {
2832 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2833 .bDeviceClass
= USB_CLASS_HUB
},
2834 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2835 .bInterfaceClass
= USB_CLASS_HUB
},
2836 { } /* Terminating entry */
2839 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2841 static struct usb_driver hub_driver
= {
2844 .disconnect
= hub_disconnect
,
2845 .suspend
= hub_suspend
,
2846 .resume
= hub_resume
,
2847 .pre_reset
= hub_pre_reset
,
2848 .post_reset
= hub_post_reset
,
2850 .id_table
= hub_id_table
,
2851 .supports_autosuspend
= 1,
2854 int usb_hub_init(void)
2856 if (usb_register(&hub_driver
) < 0) {
2857 printk(KERN_ERR
"%s: can't register hub driver\n",
2862 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2863 if (!IS_ERR(khubd_task
))
2866 /* Fall through if kernel_thread failed */
2867 usb_deregister(&hub_driver
);
2868 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2873 void usb_hub_cleanup(void)
2875 kthread_stop(khubd_task
);
2878 * Hub resources are freed for us by usb_deregister. It calls
2879 * usb_driver_purge on every device which in turn calls that
2880 * devices disconnect function if it is using this driver.
2881 * The hub_disconnect function takes care of releasing the
2882 * individual hub resources. -greg
2884 usb_deregister(&hub_driver
);
2885 } /* usb_hub_cleanup() */
2887 static int config_descriptors_changed(struct usb_device
*udev
)
2891 struct usb_config_descriptor
*buf
;
2893 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2894 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2895 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2897 buf
= kmalloc (len
, GFP_KERNEL
);
2899 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2900 /* assume the worst */
2903 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2905 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2907 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
2909 if (length
< old_length
) {
2910 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
2914 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
2916 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
2917 index
, buf
->bConfigurationValue
);
2922 return index
!= udev
->descriptor
.bNumConfigurations
;
2926 * usb_reset_device - perform a USB port reset to reinitialize a device
2927 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2929 * WARNING - don't use this routine to reset a composite device
2930 * (one with multiple interfaces owned by separate drivers)!
2931 * Use usb_reset_composite_device() instead.
2933 * Do a port reset, reassign the device's address, and establish its
2934 * former operating configuration. If the reset fails, or the device's
2935 * descriptors change from their values before the reset, or the original
2936 * configuration and altsettings cannot be restored, a flag will be set
2937 * telling khubd to pretend the device has been disconnected and then
2938 * re-connected. All drivers will be unbound, and the device will be
2939 * re-enumerated and probed all over again.
2941 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2942 * flagged for logical disconnection, or some other negative error code
2943 * if the reset wasn't even attempted.
2945 * The caller must own the device lock. For example, it's safe to use
2946 * this from a driver probe() routine after downloading new firmware.
2947 * For calls that might not occur during probe(), drivers should lock
2948 * the device using usb_lock_device_for_reset().
2950 int usb_reset_device(struct usb_device
*udev
)
2952 struct usb_device
*parent_hdev
= udev
->parent
;
2953 struct usb_hub
*parent_hub
;
2954 struct usb_device_descriptor descriptor
= udev
->descriptor
;
2956 int port1
= udev
->portnum
;
2958 if (udev
->state
== USB_STATE_NOTATTACHED
||
2959 udev
->state
== USB_STATE_SUSPENDED
) {
2960 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
2966 /* this requires hcd-specific logic; see OHCI hc_restart() */
2967 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
2970 parent_hub
= hdev_to_hub(parent_hdev
);
2972 set_bit(port1
, parent_hub
->busy_bits
);
2973 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
2975 /* ep0 maxpacket size may change; let the HCD know about it.
2976 * Other endpoints will be handled by re-enumeration. */
2978 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
2982 clear_bit(port1
, parent_hub
->busy_bits
);
2983 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
2984 usb_enable_root_hub_irq(parent_hdev
->bus
);
2989 /* Device might have changed firmware (DFU or similar) */
2990 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
2991 || config_descriptors_changed (udev
)) {
2992 dev_info(&udev
->dev
, "device firmware changed\n");
2993 udev
->descriptor
= descriptor
; /* for disconnect() calls */
2997 if (!udev
->actconfig
)
3000 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3001 USB_REQ_SET_CONFIGURATION
, 0,
3002 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3003 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3006 "can't restore configuration #%d (error=%d)\n",
3007 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3010 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3012 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3013 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3014 struct usb_interface_descriptor
*desc
;
3016 /* set_interface resets host side toggle even
3017 * for altsetting zero. the interface may have no driver.
3019 desc
= &intf
->cur_altsetting
->desc
;
3020 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3021 desc
->bAlternateSetting
);
3023 dev_err(&udev
->dev
, "failed to restore interface %d "
3024 "altsetting %d (error=%d)\n",
3025 desc
->bInterfaceNumber
,
3026 desc
->bAlternateSetting
,
3036 hub_port_logical_disconnect(parent_hub
, port1
);
3039 EXPORT_SYMBOL(usb_reset_device
);
3042 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3043 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3044 * @iface: interface bound to the driver making the request (optional)
3046 * Warns all drivers bound to registered interfaces (using their pre_reset
3047 * method), performs the port reset, and then lets the drivers know that
3048 * the reset is over (using their post_reset method).
3050 * Return value is the same as for usb_reset_device().
3052 * The caller must own the device lock. For example, it's safe to use
3053 * this from a driver probe() routine after downloading new firmware.
3054 * For calls that might not occur during probe(), drivers should lock
3055 * the device using usb_lock_device_for_reset().
3057 * The interface locks are acquired during the pre_reset stage and released
3058 * during the post_reset stage. However if iface is not NULL and is
3059 * currently being probed, we assume that the caller already owns its
3062 int usb_reset_composite_device(struct usb_device
*udev
,
3063 struct usb_interface
*iface
)
3066 struct usb_host_config
*config
= udev
->actconfig
;
3068 if (udev
->state
== USB_STATE_NOTATTACHED
||
3069 udev
->state
== USB_STATE_SUSPENDED
) {
3070 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3075 /* Prevent autosuspend during the reset */
3076 usb_autoresume_device(udev
);
3078 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3083 struct usb_interface
*cintf
;
3084 struct usb_driver
*drv
;
3086 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3087 cintf
= config
->interface
[i
];
3089 down(&cintf
->dev
.sem
);
3090 if (device_is_registered(&cintf
->dev
) &&
3091 cintf
->dev
.driver
) {
3092 drv
= to_usb_driver(cintf
->dev
.driver
);
3094 (drv
->pre_reset
)(cintf
);
3099 ret
= usb_reset_device(udev
);
3103 struct usb_interface
*cintf
;
3104 struct usb_driver
*drv
;
3106 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3107 cintf
= config
->interface
[i
];
3108 if (device_is_registered(&cintf
->dev
) &&
3109 cintf
->dev
.driver
) {
3110 drv
= to_usb_driver(cintf
->dev
.driver
);
3111 if (drv
->post_reset
)
3112 (drv
->post_reset
)(cintf
);
3115 up(&cintf
->dev
.sem
);
3119 usb_autosuspend_device(udev
);
3122 EXPORT_SYMBOL(usb_reset_composite_device
);