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>
34 /* Protect struct usb_device->state and ->children members
35 * Note: Both are also protected by ->dev.sem, except that ->state can
36 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
37 static DEFINE_SPINLOCK(device_state_lock
);
39 /* khubd's worklist and its lock */
40 static DEFINE_SPINLOCK(hub_event_lock
);
41 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
44 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
46 static struct task_struct
*khubd_task
;
48 /* cycle leds on hubs that aren't blinking for attention */
49 static int blinkenlights
= 0;
50 module_param (blinkenlights
, bool, S_IRUGO
);
51 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
54 * As of 2.6.10 we introduce a new USB device initialization scheme which
55 * closely resembles the way Windows works. Hopefully it will be compatible
56 * with a wider range of devices than the old scheme. However some previously
57 * working devices may start giving rise to "device not accepting address"
58 * errors; if that happens the user can try the old scheme by adjusting the
59 * following module parameters.
61 * For maximum flexibility there are two boolean parameters to control the
62 * hub driver's behavior. On the first initialization attempt, if the
63 * "old_scheme_first" parameter is set then the old scheme will be used,
64 * otherwise the new scheme is used. If that fails and "use_both_schemes"
65 * is set, then the driver will make another attempt, using the other scheme.
67 static int old_scheme_first
= 0;
68 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
69 MODULE_PARM_DESC(old_scheme_first
,
70 "start with the old device initialization scheme");
72 static int use_both_schemes
= 1;
73 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
74 MODULE_PARM_DESC(use_both_schemes
,
75 "try the other device initialization scheme if the "
80 static inline char *portspeed (int portstatus
)
82 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
84 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
91 /* Note that hdev or one of its children must be locked! */
92 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
94 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
97 /* USB 2.0 spec Section 11.24.4.5 */
98 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
102 for (i
= 0; i
< 3; i
++) {
103 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
104 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
105 USB_DT_HUB
<< 8, 0, data
, size
,
106 USB_CTRL_GET_TIMEOUT
);
107 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
114 * USB 2.0 spec Section 11.24.2.1
116 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
118 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
119 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
123 * USB 2.0 spec Section 11.24.2.2
125 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
127 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
128 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
133 * USB 2.0 spec Section 11.24.2.13
135 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
137 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
138 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
143 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
144 * for info about using port indicators
146 static void set_port_led(
152 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
153 USB_PORT_FEAT_INDICATOR
);
155 dev_dbg (hub
->intfdev
,
156 "port %d indicator %s status %d\n",
158 ({ char *s
; switch (selector
) {
159 case HUB_LED_AMBER
: s
= "amber"; break;
160 case HUB_LED_GREEN
: s
= "green"; break;
161 case HUB_LED_OFF
: s
= "off"; break;
162 case HUB_LED_AUTO
: s
= "auto"; break;
163 default: s
= "??"; break;
168 #define LED_CYCLE_PERIOD ((2*HZ)/3)
170 static void led_work (void *__hub
)
172 struct usb_hub
*hub
= __hub
;
173 struct usb_device
*hdev
= hub
->hdev
;
175 unsigned changed
= 0;
178 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
181 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
182 unsigned selector
, mode
;
184 /* 30%-50% duty cycle */
186 switch (hub
->indicator
[i
]) {
188 case INDICATOR_CYCLE
:
190 selector
= HUB_LED_AUTO
;
191 mode
= INDICATOR_AUTO
;
193 /* blinking green = sw attention */
194 case INDICATOR_GREEN_BLINK
:
195 selector
= HUB_LED_GREEN
;
196 mode
= INDICATOR_GREEN_BLINK_OFF
;
198 case INDICATOR_GREEN_BLINK_OFF
:
199 selector
= HUB_LED_OFF
;
200 mode
= INDICATOR_GREEN_BLINK
;
202 /* blinking amber = hw attention */
203 case INDICATOR_AMBER_BLINK
:
204 selector
= HUB_LED_AMBER
;
205 mode
= INDICATOR_AMBER_BLINK_OFF
;
207 case INDICATOR_AMBER_BLINK_OFF
:
208 selector
= HUB_LED_OFF
;
209 mode
= INDICATOR_AMBER_BLINK
;
211 /* blink green/amber = reserved */
212 case INDICATOR_ALT_BLINK
:
213 selector
= HUB_LED_GREEN
;
214 mode
= INDICATOR_ALT_BLINK_OFF
;
216 case INDICATOR_ALT_BLINK_OFF
:
217 selector
= HUB_LED_AMBER
;
218 mode
= INDICATOR_ALT_BLINK
;
223 if (selector
!= HUB_LED_AUTO
)
225 set_port_led(hub
, i
+ 1, selector
);
226 hub
->indicator
[i
] = mode
;
228 if (!changed
&& blinkenlights
) {
230 cursor
%= hub
->descriptor
->bNbrPorts
;
231 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
232 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
236 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
239 /* use a short timeout for hub/port status fetches */
240 #define USB_STS_TIMEOUT 1000
241 #define USB_STS_RETRIES 5
244 * USB 2.0 spec Section 11.24.2.6
246 static int get_hub_status(struct usb_device
*hdev
,
247 struct usb_hub_status
*data
)
249 int i
, status
= -ETIMEDOUT
;
251 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
252 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
253 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
254 data
, sizeof(*data
), USB_STS_TIMEOUT
);
260 * USB 2.0 spec Section 11.24.2.7
262 static int get_port_status(struct usb_device
*hdev
, int port1
,
263 struct usb_port_status
*data
)
265 int i
, status
= -ETIMEDOUT
;
267 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
268 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
269 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
270 data
, sizeof(*data
), USB_STS_TIMEOUT
);
275 static void kick_khubd(struct usb_hub
*hub
)
279 spin_lock_irqsave(&hub_event_lock
, flags
);
280 if (list_empty(&hub
->event_list
)) {
281 list_add_tail(&hub
->event_list
, &hub_event_list
);
282 wake_up(&khubd_wait
);
284 spin_unlock_irqrestore(&hub_event_lock
, flags
);
287 void usb_kick_khubd(struct usb_device
*hdev
)
289 kick_khubd(hdev_to_hub(hdev
));
293 /* completion function, fires on port status changes and various faults */
294 static void hub_irq(struct urb
*urb
, struct pt_regs
*regs
)
296 struct usb_hub
*hub
= (struct usb_hub
*)urb
->context
;
301 switch (urb
->status
) {
302 case -ENOENT
: /* synchronous unlink */
303 case -ECONNRESET
: /* async unlink */
304 case -ESHUTDOWN
: /* hardware going away */
307 default: /* presumably an error */
308 /* Cause a hub reset after 10 consecutive errors */
309 dev_dbg (hub
->intfdev
, "transfer --> %d\n", urb
->status
);
310 if ((++hub
->nerrors
< 10) || hub
->error
)
312 hub
->error
= urb
->status
;
315 /* let khubd handle things */
316 case 0: /* we got data: port status changed */
318 for (i
= 0; i
< urb
->actual_length
; ++i
)
319 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
321 hub
->event_bits
[0] = bits
;
327 /* Something happened, let khubd figure it out */
334 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
335 && status
!= -ENODEV
&& status
!= -EPERM
)
336 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
339 /* USB 2.0 spec Section 11.24.2.3 */
341 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
343 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
344 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
349 * enumeration blocks khubd for a long time. we use keventd instead, since
350 * long blocking there is the exception, not the rule. accordingly, HCDs
351 * talking to TTs must queue control transfers (not just bulk and iso), so
352 * both can talk to the same hub concurrently.
354 static void hub_tt_kevent (void *arg
)
356 struct usb_hub
*hub
= arg
;
359 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
360 while (!list_empty (&hub
->tt
.clear_list
)) {
361 struct list_head
*temp
;
362 struct usb_tt_clear
*clear
;
363 struct usb_device
*hdev
= hub
->hdev
;
366 temp
= hub
->tt
.clear_list
.next
;
367 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
368 list_del (&clear
->clear_list
);
370 /* drop lock so HCD can concurrently report other TT errors */
371 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
372 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
373 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
377 "clear tt %d (%04x) error %d\n",
378 clear
->tt
, clear
->devinfo
, status
);
381 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
385 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
386 * @udev: the device whose split transaction failed
387 * @pipe: identifies the endpoint of the failed transaction
389 * High speed HCDs use this to tell the hub driver that some split control or
390 * bulk transaction failed in a way that requires clearing internal state of
391 * a transaction translator. This is normally detected (and reported) from
394 * It may not be possible for that hub to handle additional full (or low)
395 * speed transactions until that state is fully cleared out.
397 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
399 struct usb_tt
*tt
= udev
->tt
;
401 struct usb_tt_clear
*clear
;
403 /* we've got to cope with an arbitrary number of pending TT clears,
404 * since each TT has "at least two" buffers that can need it (and
405 * there can be many TTs per hub). even if they're uncommon.
407 if ((clear
= kmalloc (sizeof *clear
, SLAB_ATOMIC
)) == NULL
) {
408 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
409 /* FIXME recover somehow ... RESET_TT? */
413 /* info that CLEAR_TT_BUFFER needs */
414 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
415 clear
->devinfo
= usb_pipeendpoint (pipe
);
416 clear
->devinfo
|= udev
->devnum
<< 4;
417 clear
->devinfo
|= usb_pipecontrol (pipe
)
418 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
419 : (USB_ENDPOINT_XFER_BULK
<< 11);
420 if (usb_pipein (pipe
))
421 clear
->devinfo
|= 1 << 15;
423 /* tell keventd to clear state for this TT */
424 spin_lock_irqsave (&tt
->lock
, flags
);
425 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
426 schedule_work (&tt
->kevent
);
427 spin_unlock_irqrestore (&tt
->lock
, flags
);
430 static void hub_power_on(struct usb_hub
*hub
)
433 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
434 u16 wHubCharacteristics
=
435 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
437 /* Enable power on each port. Some hubs have reserved values
438 * of LPSM (> 2) in their descriptors, even though they are
439 * USB 2.0 hubs. Some hubs do not implement port-power switching
440 * but only emulate it. In all cases, the ports won't work
441 * unless we send these messages to the hub.
443 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
444 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
446 dev_dbg(hub
->intfdev
, "trying to enable port power on "
447 "non-switchable hub\n");
448 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
449 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
451 /* Wait at least 100 msec for power to become stable */
452 msleep(max(pgood_delay
, (unsigned) 100));
455 static inline void __hub_quiesce(struct usb_hub
*hub
)
457 /* (nonblocking) khubd and related activity won't re-trigger */
460 hub
->resume_root_hub
= 0;
463 static void hub_quiesce(struct usb_hub
*hub
)
465 /* (blocking) stop khubd and related activity */
467 usb_kill_urb(hub
->urb
);
468 if (hub
->has_indicators
)
469 cancel_delayed_work(&hub
->leds
);
470 if (hub
->has_indicators
|| hub
->tt
.hub
)
471 flush_scheduled_work();
474 static void hub_activate(struct usb_hub
*hub
)
480 hub
->resume_root_hub
= 0;
481 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
483 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
484 if (hub
->has_indicators
&& blinkenlights
)
485 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
487 /* scan all ports ASAP */
491 static int hub_hub_status(struct usb_hub
*hub
,
492 u16
*status
, u16
*change
)
496 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
498 dev_err (hub
->intfdev
,
499 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
501 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
502 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
508 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
510 struct usb_device
*hdev
= hub
->hdev
;
513 if (hdev
->children
[port1
-1] && set_state
) {
514 usb_set_device_state(hdev
->children
[port1
-1],
515 USB_STATE_NOTATTACHED
);
517 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
519 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
526 /* caller has locked the hub device */
527 static void hub_pre_reset(struct usb_interface
*intf
)
529 struct usb_hub
*hub
= usb_get_intfdata(intf
);
530 struct usb_device
*hdev
= hub
->hdev
;
533 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
534 if (hdev
->children
[port1
- 1]) {
535 usb_disconnect(&hdev
->children
[port1
- 1]);
537 hub_port_disable(hub
, port1
, 0);
543 /* caller has locked the hub device */
544 static void hub_post_reset(struct usb_interface
*intf
)
546 struct usb_hub
*hub
= usb_get_intfdata(intf
);
553 static int hub_configure(struct usb_hub
*hub
,
554 struct usb_endpoint_descriptor
*endpoint
)
556 struct usb_device
*hdev
= hub
->hdev
;
557 struct device
*hub_dev
= hub
->intfdev
;
558 u16 hubstatus
, hubchange
;
559 u16 wHubCharacteristics
;
564 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
567 message
= "can't allocate hub irq buffer";
572 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
574 message
= "can't kmalloc hub status buffer";
579 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
580 if (!hub
->descriptor
) {
581 message
= "can't kmalloc hub descriptor";
586 /* Request the entire hub descriptor.
587 * hub->descriptor can handle USB_MAXCHILDREN ports,
588 * but the hub can/will return fewer bytes here.
590 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
591 sizeof(*hub
->descriptor
));
593 message
= "can't read hub descriptor";
595 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
596 message
= "hub has too many ports!";
601 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
602 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
603 (hdev
->maxchild
== 1) ? "" : "s");
605 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
607 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
609 char portstr
[USB_MAXCHILDREN
+ 1];
611 for (i
= 0; i
< hdev
->maxchild
; i
++)
612 portstr
[i
] = hub
->descriptor
->DeviceRemovable
613 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
615 portstr
[hdev
->maxchild
] = 0;
616 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
618 dev_dbg(hub_dev
, "standalone hub\n");
620 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
622 dev_dbg(hub_dev
, "ganged power switching\n");
625 dev_dbg(hub_dev
, "individual port power switching\n");
629 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
633 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
635 dev_dbg(hub_dev
, "global over-current protection\n");
638 dev_dbg(hub_dev
, "individual port over-current protection\n");
642 dev_dbg(hub_dev
, "no over-current protection\n");
646 spin_lock_init (&hub
->tt
.lock
);
647 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
648 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
, hub
);
649 switch (hdev
->descriptor
.bDeviceProtocol
) {
653 dev_dbg(hub_dev
, "Single TT\n");
657 ret
= usb_set_interface(hdev
, 0, 1);
659 dev_dbg(hub_dev
, "TT per port\n");
662 dev_err(hub_dev
, "Using single TT (err %d)\n",
667 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
668 hdev
->descriptor
.bDeviceProtocol
);
672 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
673 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
674 case HUB_TTTT_8_BITS
:
675 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
676 hub
->tt
.think_time
= 666;
677 dev_dbg(hub_dev
, "TT requires at most %d "
678 "FS bit times (%d ns)\n",
679 8, hub
->tt
.think_time
);
682 case HUB_TTTT_16_BITS
:
683 hub
->tt
.think_time
= 666 * 2;
684 dev_dbg(hub_dev
, "TT requires at most %d "
685 "FS bit times (%d ns)\n",
686 16, hub
->tt
.think_time
);
688 case HUB_TTTT_24_BITS
:
689 hub
->tt
.think_time
= 666 * 3;
690 dev_dbg(hub_dev
, "TT requires at most %d "
691 "FS bit times (%d ns)\n",
692 24, hub
->tt
.think_time
);
694 case HUB_TTTT_32_BITS
:
695 hub
->tt
.think_time
= 666 * 4;
696 dev_dbg(hub_dev
, "TT requires at most %d "
697 "FS bit times (%d ns)\n",
698 32, hub
->tt
.think_time
);
702 /* probe() zeroes hub->indicator[] */
703 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
704 hub
->has_indicators
= 1;
705 dev_dbg(hub_dev
, "Port indicators are supported\n");
708 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
709 hub
->descriptor
->bPwrOn2PwrGood
* 2);
711 /* power budgeting mostly matters with bus-powered hubs,
712 * and battery-powered root hubs (may provide just 8 mA).
714 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
716 message
= "can't get hub status";
719 le16_to_cpus(&hubstatus
);
720 if (hdev
== hdev
->bus
->root_hub
) {
721 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
722 hub
->mA_per_port
= 500;
724 hub
->mA_per_port
= hdev
->bus_mA
;
725 hub
->limited_power
= 1;
727 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
728 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
729 hub
->descriptor
->bHubContrCurrent
);
730 hub
->limited_power
= 1;
731 if (hdev
->maxchild
> 0) {
732 int remaining
= hdev
->bus_mA
-
733 hub
->descriptor
->bHubContrCurrent
;
735 if (remaining
< hdev
->maxchild
* 100)
737 "insufficient power available "
738 "to use all downstream ports\n");
739 hub
->mA_per_port
= 100; /* 7.2.1.1 */
741 } else { /* Self-powered external hub */
742 /* FIXME: What about battery-powered external hubs that
743 * provide less current per port? */
744 hub
->mA_per_port
= 500;
746 if (hub
->mA_per_port
< 500)
747 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
750 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
752 message
= "can't get hub status";
756 /* local power status reports aren't always correct */
757 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
758 dev_dbg(hub_dev
, "local power source is %s\n",
759 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
760 ? "lost (inactive)" : "good");
762 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
763 dev_dbg(hub_dev
, "%sover-current condition exists\n",
764 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
766 /* set up the interrupt endpoint */
767 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
768 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
770 if (maxp
> sizeof(*hub
->buffer
))
771 maxp
= sizeof(*hub
->buffer
);
773 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
775 message
= "couldn't allocate interrupt urb";
780 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
781 hub
, endpoint
->bInterval
);
782 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
783 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
785 /* maybe cycle the hub leds */
786 if (hub
->has_indicators
&& blinkenlights
)
787 hub
->indicator
[0] = INDICATOR_CYCLE
;
794 dev_err (hub_dev
, "config failed, %s (err %d)\n",
796 /* hub_disconnect() frees urb and descriptor */
800 static unsigned highspeed_hubs
;
802 static void hub_disconnect(struct usb_interface
*intf
)
804 struct usb_hub
*hub
= usb_get_intfdata (intf
);
805 struct usb_device
*hdev
;
807 /* Disconnect all children and quiesce the hub */
811 usb_set_intfdata (intf
, NULL
);
814 if (hdev
->speed
== USB_SPEED_HIGH
)
817 usb_free_urb(hub
->urb
);
820 spin_lock_irq(&hub_event_lock
);
821 list_del_init(&hub
->event_list
);
822 spin_unlock_irq(&hub_event_lock
);
824 kfree(hub
->descriptor
);
825 hub
->descriptor
= NULL
;
831 usb_buffer_free(hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
839 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
841 struct usb_host_interface
*desc
;
842 struct usb_endpoint_descriptor
*endpoint
;
843 struct usb_device
*hdev
;
846 desc
= intf
->cur_altsetting
;
847 hdev
= interface_to_usbdev(intf
);
849 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
851 dev_warn(&intf
->dev
, "ignoring external hub\n");
856 /* Some hubs have a subclass of 1, which AFAICT according to the */
857 /* specs is not defined, but it works */
858 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
859 (desc
->desc
.bInterfaceSubClass
!= 1)) {
861 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
865 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
866 if (desc
->desc
.bNumEndpoints
!= 1)
867 goto descriptor_error
;
869 endpoint
= &desc
->endpoint
[0].desc
;
871 /* Output endpoint? Curiouser and curiouser.. */
872 if (!(endpoint
->bEndpointAddress
& USB_DIR_IN
))
873 goto descriptor_error
;
875 /* If it's not an interrupt endpoint, we'd better punt! */
876 if ((endpoint
->bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
877 != USB_ENDPOINT_XFER_INT
)
878 goto descriptor_error
;
881 dev_info (&intf
->dev
, "USB hub found\n");
883 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
885 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
889 INIT_LIST_HEAD(&hub
->event_list
);
890 hub
->intfdev
= &intf
->dev
;
892 INIT_WORK(&hub
->leds
, led_work
, hub
);
894 usb_set_intfdata (intf
, hub
);
896 if (hdev
->speed
== USB_SPEED_HIGH
)
899 if (hub_configure(hub
, endpoint
) >= 0)
902 hub_disconnect (intf
);
907 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
909 struct usb_device
*hdev
= interface_to_usbdev (intf
);
911 /* assert ifno == 0 (part of hub spec) */
913 case USBDEVFS_HUB_PORTINFO
: {
914 struct usbdevfs_hub_portinfo
*info
= user_data
;
917 spin_lock_irq(&device_state_lock
);
918 if (hdev
->devnum
<= 0)
921 info
->nports
= hdev
->maxchild
;
922 for (i
= 0; i
< info
->nports
; i
++) {
923 if (hdev
->children
[i
] == NULL
)
927 hdev
->children
[i
]->devnum
;
930 spin_unlock_irq(&device_state_lock
);
932 return info
->nports
+ 1;
941 /* grab device/port lock, returning index of that port (zero based).
942 * protects the upstream link used by this device from concurrent
943 * tree operations like suspend, resume, reset, and disconnect, which
944 * apply to everything downstream of a given port.
946 static int locktree(struct usb_device
*udev
)
949 struct usb_device
*hdev
;
954 /* root hub is always the first lock in the series */
957 usb_lock_device(udev
);
961 /* on the path from root to us, lock everything from
962 * top down, dropping parent locks when not needed
968 /* everything is fail-fast once disconnect
971 if (udev
->state
== USB_STATE_NOTATTACHED
) {
972 usb_unlock_device(hdev
);
976 /* when everyone grabs locks top->bottom,
977 * non-overlapping work may be concurrent
979 usb_lock_device(udev
);
980 usb_unlock_device(hdev
);
981 return udev
->portnum
;
984 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
988 for (i
= 0; i
< udev
->maxchild
; ++i
) {
989 if (udev
->children
[i
])
990 recursively_mark_NOTATTACHED(udev
->children
[i
]);
992 udev
->state
= USB_STATE_NOTATTACHED
;
996 * usb_set_device_state - change a device's current state (usbcore, hcds)
997 * @udev: pointer to device whose state should be changed
998 * @new_state: new state value to be stored
1000 * udev->state is _not_ fully protected by the device lock. Although
1001 * most transitions are made only while holding the lock, the state can
1002 * can change to USB_STATE_NOTATTACHED at almost any time. This
1003 * is so that devices can be marked as disconnected as soon as possible,
1004 * without having to wait for any semaphores to be released. As a result,
1005 * all changes to any device's state must be protected by the
1006 * device_state_lock spinlock.
1008 * Once a device has been added to the device tree, all changes to its state
1009 * should be made using this routine. The state should _not_ be set directly.
1011 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1012 * Otherwise udev->state is set to new_state, and if new_state is
1013 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1014 * to USB_STATE_NOTATTACHED.
1016 void usb_set_device_state(struct usb_device
*udev
,
1017 enum usb_device_state new_state
)
1019 unsigned long flags
;
1021 spin_lock_irqsave(&device_state_lock
, flags
);
1022 if (udev
->state
== USB_STATE_NOTATTACHED
)
1024 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1025 udev
->state
= new_state
;
1027 /* root hub wakeup capabilities are managed out-of-band
1028 * and may involve silicon errata ... ignore them here.
1031 if (new_state
== USB_STATE_CONFIGURED
)
1032 device_init_wakeup(&udev
->dev
,
1033 (udev
->actconfig
->desc
.bmAttributes
1034 & USB_CONFIG_ATT_WAKEUP
));
1035 else if (new_state
!= USB_STATE_SUSPENDED
)
1036 device_init_wakeup(&udev
->dev
, 0);
1039 recursively_mark_NOTATTACHED(udev
);
1040 spin_unlock_irqrestore(&device_state_lock
, flags
);
1047 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1048 * @rhdev: struct usb_device for the root hub
1050 * The USB host controller driver calls this function when its root hub
1051 * is resumed and Vbus power has been interrupted or the controller
1052 * has been reset. The routine marks all the children of the root hub
1053 * as NOTATTACHED and marks logical connect-change events on their ports.
1055 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
1057 struct usb_hub
*hub
;
1059 unsigned long flags
;
1061 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
1062 spin_lock_irqsave(&device_state_lock
, flags
);
1063 hub
= hdev_to_hub(rhdev
);
1064 for (port1
= 1; port1
<= rhdev
->maxchild
; ++port1
) {
1065 if (rhdev
->children
[port1
- 1]) {
1066 recursively_mark_NOTATTACHED(
1067 rhdev
->children
[port1
- 1]);
1068 set_bit(port1
, hub
->change_bits
);
1071 spin_unlock_irqrestore(&device_state_lock
, flags
);
1073 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
1077 static void choose_address(struct usb_device
*udev
)
1080 struct usb_bus
*bus
= udev
->bus
;
1082 /* If khubd ever becomes multithreaded, this will need a lock */
1084 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1085 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1088 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1090 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1093 set_bit(devnum
, bus
->devmap
.devicemap
);
1094 udev
->devnum
= devnum
;
1098 static void release_address(struct usb_device
*udev
)
1100 if (udev
->devnum
> 0) {
1101 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1107 * usb_disconnect - disconnect a device (usbcore-internal)
1108 * @pdev: pointer to device being disconnected
1109 * Context: !in_interrupt ()
1111 * Something got disconnected. Get rid of it and all of its children.
1113 * If *pdev is a normal device then the parent hub must already be locked.
1114 * If *pdev is a root hub then this routine will acquire the
1115 * usb_bus_list_lock on behalf of the caller.
1117 * Only hub drivers (including virtual root hub drivers for host
1118 * controllers) should ever call this.
1120 * This call is synchronous, and may not be used in an interrupt context.
1122 void usb_disconnect(struct usb_device
**pdev
)
1124 struct usb_device
*udev
= *pdev
;
1128 pr_debug ("%s nodev\n", __FUNCTION__
);
1132 /* mark the device as inactive, so any further urb submissions for
1133 * this device (and any of its children) will fail immediately.
1134 * this quiesces everyting except pending urbs.
1136 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1137 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1139 usb_lock_device(udev
);
1141 /* Free up all the children before we remove this device */
1142 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1143 if (udev
->children
[i
])
1144 usb_disconnect(&udev
->children
[i
]);
1147 /* deallocate hcd/hardware state ... nuking all pending urbs and
1148 * cleaning up all state associated with the current configuration
1149 * so that the hardware is now fully quiesced.
1151 usb_disable_device(udev
, 0);
1153 usb_notify_remove_device(udev
);
1155 /* Free the device number, remove the /proc/bus/usb entry and
1156 * the sysfs attributes, and delete the parent's children[]
1157 * (or root_hub) pointer.
1159 dev_dbg (&udev
->dev
, "unregistering device\n");
1160 release_address(udev
);
1161 usb_remove_sysfs_dev_files(udev
);
1163 /* Avoid races with recursively_mark_NOTATTACHED() */
1164 spin_lock_irq(&device_state_lock
);
1166 spin_unlock_irq(&device_state_lock
);
1168 usb_unlock_device(udev
);
1170 device_unregister(&udev
->dev
);
1173 static inline const char *plural(int n
)
1175 return (n
== 1 ? "" : "s");
1178 static int choose_configuration(struct usb_device
*udev
)
1182 int insufficient_power
= 0;
1183 struct usb_host_config
*c
, *best
;
1187 num_configs
= udev
->descriptor
.bNumConfigurations
;
1188 for (i
= 0; i
< num_configs
; (i
++, c
++)) {
1189 struct usb_interface_descriptor
*desc
= NULL
;
1191 /* It's possible that a config has no interfaces! */
1192 if (c
->desc
.bNumInterfaces
> 0)
1193 desc
= &c
->intf_cache
[0]->altsetting
->desc
;
1196 * HP's USB bus-powered keyboard has only one configuration
1197 * and it claims to be self-powered; other devices may have
1198 * similar errors in their descriptors. If the next test
1199 * were allowed to execute, such configurations would always
1200 * be rejected and the devices would not work as expected.
1201 * In the meantime, we run the risk of selecting a config
1202 * that requires external power at a time when that power
1203 * isn't available. It seems to be the lesser of two evils.
1205 * Bugzilla #6448 reports a device that appears to crash
1206 * when it receives a GET_DEVICE_STATUS request! We don't
1207 * have any other way to tell whether a device is self-powered,
1208 * but since we don't use that information anywhere but here,
1209 * the call has been removed.
1211 * Maybe the GET_DEVICE_STATUS call and the test below can
1212 * be reinstated when device firmwares become more reliable.
1213 * Don't hold your breath.
1216 /* Rule out self-powered configs for a bus-powered device */
1217 if (bus_powered
&& (c
->desc
.bmAttributes
&
1218 USB_CONFIG_ATT_SELFPOWER
))
1223 * The next test may not be as effective as it should be.
1224 * Some hubs have errors in their descriptor, claiming
1225 * to be self-powered when they are really bus-powered.
1226 * We will overestimate the amount of current such hubs
1227 * make available for each port.
1229 * This is a fairly benign sort of failure. It won't
1230 * cause us to reject configurations that we should have
1234 /* Rule out configs that draw too much bus current */
1235 if (c
->desc
.bMaxPower
* 2 > udev
->bus_mA
) {
1236 insufficient_power
++;
1240 /* If the first config's first interface is COMM/2/0xff
1241 * (MSFT RNDIS), rule it out unless Linux has host-side
1244 && desc
->bInterfaceClass
== USB_CLASS_COMM
1245 && desc
->bInterfaceSubClass
== 2
1246 && desc
->bInterfaceProtocol
== 0xff) {
1247 #ifndef CONFIG_USB_NET_RNDIS_HOST
1254 /* From the remaining configs, choose the first one whose
1255 * first interface is for a non-vendor-specific class.
1256 * Reason: Linux is more likely to have a class driver
1257 * than a vendor-specific driver. */
1258 else if (udev
->descriptor
.bDeviceClass
!=
1259 USB_CLASS_VENDOR_SPEC
&&
1260 (!desc
|| desc
->bInterfaceClass
!=
1261 USB_CLASS_VENDOR_SPEC
)) {
1266 /* If all the remaining configs are vendor-specific,
1267 * choose the first one. */
1272 if (insufficient_power
> 0)
1273 dev_info(&udev
->dev
, "rejected %d configuration%s "
1274 "due to insufficient available bus power\n",
1275 insufficient_power
, plural(insufficient_power
));
1278 i
= best
->desc
.bConfigurationValue
;
1279 dev_info(&udev
->dev
,
1280 "configuration #%d chosen from %d choice%s\n",
1281 i
, num_configs
, plural(num_configs
));
1284 dev_warn(&udev
->dev
,
1285 "no configuration chosen from %d choice%s\n",
1286 num_configs
, plural(num_configs
));
1292 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1296 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1300 static inline void show_string(struct usb_device
*udev
, char *id
, char *string
)
1305 #ifdef CONFIG_USB_OTG
1306 #include "otg_whitelist.h"
1310 * usb_new_device - perform initial device setup (usbcore-internal)
1311 * @udev: newly addressed device (in ADDRESS state)
1313 * This is called with devices which have been enumerated, but not yet
1314 * configured. The device descriptor is available, but not descriptors
1315 * for any device configuration. The caller must have locked either
1316 * the parent hub (if udev is a normal device) or else the
1317 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1318 * udev has already been installed, but udev is not yet visible through
1319 * sysfs or other filesystem code.
1321 * Returns 0 for success (device is configured and listed, with its
1322 * interfaces, in sysfs); else a negative errno value.
1324 * This call is synchronous, and may not be used in an interrupt context.
1326 * Only the hub driver or root-hub registrar should ever call this.
1328 int usb_new_device(struct usb_device
*udev
)
1333 err
= usb_get_configuration(udev
);
1335 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1340 /* read the standard strings and cache them if present */
1341 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1342 udev
->manufacturer
= usb_cache_string(udev
,
1343 udev
->descriptor
.iManufacturer
);
1344 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1346 /* Tell the world! */
1347 dev_dbg(&udev
->dev
, "new device strings: Mfr=%d, Product=%d, "
1348 "SerialNumber=%d\n",
1349 udev
->descriptor
.iManufacturer
,
1350 udev
->descriptor
.iProduct
,
1351 udev
->descriptor
.iSerialNumber
);
1352 show_string(udev
, "Product", udev
->product
);
1353 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1354 show_string(udev
, "SerialNumber", udev
->serial
);
1356 #ifdef CONFIG_USB_OTG
1358 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1359 * to wake us after we've powered off VBUS; and HNP, switching roles
1360 * "host" to "peripheral". The OTG descriptor helps figure this out.
1362 if (!udev
->bus
->is_b_host
1364 && udev
->parent
== udev
->bus
->root_hub
) {
1365 struct usb_otg_descriptor
*desc
= 0;
1366 struct usb_bus
*bus
= udev
->bus
;
1368 /* descriptor may appear anywhere in config */
1369 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1370 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1371 USB_DT_OTG
, (void **) &desc
) == 0) {
1372 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1373 unsigned port1
= udev
->portnum
;
1374 struct usb_device
*root
= udev
->parent
;
1376 dev_info(&udev
->dev
,
1377 "Dual-Role OTG device on %sHNP port\n",
1378 (port1
== bus
->otg_port
)
1381 /* enable HNP before suspend, it's simpler */
1382 if (port1
== bus
->otg_port
)
1383 bus
->b_hnp_enable
= 1;
1384 err
= usb_control_msg(udev
,
1385 usb_sndctrlpipe(udev
, 0),
1386 USB_REQ_SET_FEATURE
, 0,
1388 ? USB_DEVICE_B_HNP_ENABLE
1389 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1390 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1392 /* OTG MESSAGE: report errors here,
1393 * customize to match your product.
1395 dev_info(&udev
->dev
,
1396 "can't set HNP mode; %d\n",
1398 bus
->b_hnp_enable
= 0;
1404 if (!is_targeted(udev
)) {
1406 /* Maybe it can talk to us, though we can't talk to it.
1407 * (Includes HNP test device.)
1409 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1410 static int __usb_suspend_device(struct usb_device
*,
1412 err
= __usb_suspend_device(udev
, udev
->bus
->otg_port
);
1414 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1421 /* put device-specific files into sysfs */
1422 err
= device_add (&udev
->dev
);
1424 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1427 usb_create_sysfs_dev_files (udev
);
1429 usb_lock_device(udev
);
1431 /* choose and set the configuration. that registers the interfaces
1432 * with the driver core, and lets usb device drivers bind to them.
1434 c
= choose_configuration(udev
);
1436 err
= usb_set_configuration(udev
, c
);
1438 dev_err(&udev
->dev
, "can't set config #%d, error %d\n",
1440 /* This need not be fatal. The user can try to
1441 * set other configurations. */
1445 /* USB device state == configured ... usable */
1446 usb_notify_add_device(udev
);
1448 usb_unlock_device(udev
);
1453 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1458 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1459 u16
*status
, u16
*change
)
1463 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1465 dev_err (hub
->intfdev
,
1466 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1468 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1469 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1475 #define PORT_RESET_TRIES 5
1476 #define SET_ADDRESS_TRIES 2
1477 #define GET_DESCRIPTOR_TRIES 2
1478 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1479 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1481 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1482 #define HUB_SHORT_RESET_TIME 10
1483 #define HUB_LONG_RESET_TIME 200
1484 #define HUB_RESET_TIMEOUT 500
1486 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1487 struct usb_device
*udev
, unsigned int delay
)
1489 int delay_time
, ret
;
1493 for (delay_time
= 0;
1494 delay_time
< HUB_RESET_TIMEOUT
;
1495 delay_time
+= delay
) {
1496 /* wait to give the device a chance to reset */
1499 /* read and decode port status */
1500 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1504 /* Device went away? */
1505 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1508 /* bomb out completely if something weird happened */
1509 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1512 /* if we`ve finished resetting, then break out of the loop */
1513 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1514 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1515 if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1516 udev
->speed
= USB_SPEED_HIGH
;
1517 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1518 udev
->speed
= USB_SPEED_LOW
;
1520 udev
->speed
= USB_SPEED_FULL
;
1524 /* switch to the long delay after two short delay failures */
1525 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1526 delay
= HUB_LONG_RESET_TIME
;
1528 dev_dbg (hub
->intfdev
,
1529 "port %d not reset yet, waiting %dms\n",
1536 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1537 struct usb_device
*udev
, unsigned int delay
)
1541 /* Reset the port */
1542 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1543 status
= set_port_feature(hub
->hdev
,
1544 port1
, USB_PORT_FEAT_RESET
);
1546 dev_err(hub
->intfdev
,
1547 "cannot reset port %d (err = %d)\n",
1550 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1551 if (status
&& status
!= -ENOTCONN
)
1552 dev_dbg(hub
->intfdev
,
1553 "port_wait_reset: err = %d\n",
1557 /* return on disconnect or reset */
1560 /* TRSTRCY = 10 ms; plus some extra */
1565 clear_port_feature(hub
->hdev
,
1566 port1
, USB_PORT_FEAT_C_RESET
);
1567 /* FIXME need disconnect() for NOTATTACHED device */
1568 usb_set_device_state(udev
, status
1569 ? USB_STATE_NOTATTACHED
1570 : USB_STATE_DEFAULT
);
1574 dev_dbg (hub
->intfdev
,
1575 "port %d not enabled, trying reset again...\n",
1577 delay
= HUB_LONG_RESET_TIME
;
1580 dev_err (hub
->intfdev
,
1581 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1588 * Disable a port and mark a logical connnect-change event, so that some
1589 * time later khubd will disconnect() any existing usb_device on the port
1590 * and will re-enumerate if there actually is a device attached.
1592 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
1594 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
1595 hub_port_disable(hub
, port1
, 1);
1597 /* FIXME let caller ask to power down the port:
1598 * - some devices won't enumerate without a VBUS power cycle
1599 * - SRP saves power that way
1600 * - ... new call, TBD ...
1601 * That's easy if this hub can switch power per-port, and
1602 * khubd reactivates the port later (timer, SRP, etc).
1603 * Powerdown must be optional, because of reset/DFU.
1606 set_bit(port1
, hub
->change_bits
);
1611 #ifdef CONFIG_USB_SUSPEND
1614 * Selective port suspend reduces power; most suspended devices draw
1615 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1616 * All devices below the suspended port are also suspended.
1618 * Devices leave suspend state when the host wakes them up. Some devices
1619 * also support "remote wakeup", where the device can activate the USB
1620 * tree above them to deliver data, such as a keypress or packet. In
1621 * some cases, this wakes the USB host.
1623 static int hub_port_suspend(struct usb_hub
*hub
, int port1
,
1624 struct usb_device
*udev
)
1628 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1630 /* enable remote wakeup when appropriate; this lets the device
1631 * wake up the upstream hub (including maybe the root hub).
1633 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1634 * we don't explicitly enable it here.
1636 if (device_may_wakeup(&udev
->dev
)) {
1637 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1638 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1639 USB_DEVICE_REMOTE_WAKEUP
, 0,
1641 USB_CTRL_SET_TIMEOUT
);
1644 "won't remote wakeup, status %d\n",
1649 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1651 dev_dbg(hub
->intfdev
,
1652 "can't suspend port %d, status %d\n",
1654 /* paranoia: "should not happen" */
1655 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1656 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1657 USB_DEVICE_REMOTE_WAKEUP
, 0,
1659 USB_CTRL_SET_TIMEOUT
);
1661 /* device has up to 10 msec to fully suspend */
1662 dev_dbg(&udev
->dev
, "usb suspend\n");
1663 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1670 * Devices on USB hub ports have only one "suspend" state, corresponding
1671 * to ACPI D2, "may cause the device to lose some context".
1672 * State transitions include:
1674 * - suspend, resume ... when the VBUS power link stays live
1675 * - suspend, disconnect ... VBUS lost
1677 * Once VBUS drop breaks the circuit, the port it's using has to go through
1678 * normal re-enumeration procedures, starting with enabling VBUS power.
1679 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1680 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1681 * timer, no SRP, no requests through sysfs.
1683 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1684 * the root hub for their bus goes into global suspend ... so we don't
1685 * (falsely) update the device power state to say it suspended.
1687 static int __usb_suspend_device (struct usb_device
*udev
, int port1
)
1691 /* caller owns the udev device lock */
1695 if (udev
->state
== USB_STATE_SUSPENDED
1696 || udev
->state
== USB_STATE_NOTATTACHED
) {
1700 /* all interfaces must already be suspended */
1701 if (udev
->actconfig
) {
1704 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1705 struct usb_interface
*intf
;
1707 intf
= udev
->actconfig
->interface
[i
];
1708 if (is_active(intf
)) {
1709 dev_dbg(&intf
->dev
, "nyet suspended\n");
1715 /* we only change a device's upstream USB link.
1716 * root hubs have no upstream USB link.
1719 status
= hub_port_suspend(hdev_to_hub(udev
->parent
), port1
,
1723 udev
->dev
.power
.power_state
= PMSG_SUSPEND
;
1730 * usb_suspend_device - suspend a usb device
1731 * @udev: device that's no longer in active use
1732 * Context: must be able to sleep; device not locked; pm locks held
1734 * Suspends a USB device that isn't in active use, conserving power.
1735 * Devices may wake out of a suspend, if anything important happens,
1736 * using the remote wakeup mechanism. They may also be taken out of
1737 * suspend by the host, using usb_resume_device(). It's also routine
1738 * to disconnect devices while they are suspended.
1740 * This only affects the USB hardware for a device; its interfaces
1741 * (and, for hubs, child devices) must already have been suspended.
1743 * Suspending OTG devices may trigger HNP, if that's been enabled
1744 * between a pair of dual-role devices. That will change roles, such
1745 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1747 * Returns 0 on success, else negative errno.
1749 int usb_suspend_device(struct usb_device
*udev
)
1751 #ifdef CONFIG_USB_SUSPEND
1752 if (udev
->state
== USB_STATE_NOTATTACHED
)
1754 return __usb_suspend_device(udev
, udev
->portnum
);
1756 /* NOTE: udev->state unchanged, it's not lying ... */
1757 udev
->dev
.power
.power_state
= PMSG_SUSPEND
;
1763 * If the USB "suspend" state is in use (rather than "global suspend"),
1764 * many devices will be individually taken out of suspend state using
1765 * special" resume" signaling. These routines kick in shortly after
1766 * hardware resume signaling is finished, either because of selective
1767 * resume (by host) or remote wakeup (by device) ... now see what changed
1768 * in the tree that's rooted at this device.
1770 static int finish_device_resume(struct usb_device
*udev
)
1775 /* caller owns the udev device lock */
1776 dev_dbg(&udev
->dev
, "finish resume\n");
1778 /* usb ch9 identifies four variants of SUSPENDED, based on what
1779 * state the device resumes to. Linux currently won't see the
1780 * first two on the host side; they'd be inside hub_port_init()
1781 * during many timeouts, but khubd can't suspend until later.
1783 usb_set_device_state(udev
, udev
->actconfig
1784 ? USB_STATE_CONFIGURED
1785 : USB_STATE_ADDRESS
);
1786 udev
->dev
.power
.power_state
= PMSG_ON
;
1788 /* 10.5.4.5 says be sure devices in the tree are still there.
1789 * For now let's assume the device didn't go crazy on resume,
1790 * and device drivers will know about any resume quirks.
1792 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1794 status
= (status
== 2 ? 0 : -ENODEV
);
1798 "gone after usb resume? status %d\n",
1800 else if (udev
->actconfig
) {
1802 int (*resume
)(struct device
*);
1804 le16_to_cpus(&devstatus
);
1805 if ((devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
1807 status
= usb_control_msg(udev
,
1808 usb_sndctrlpipe(udev
, 0),
1809 USB_REQ_CLEAR_FEATURE
,
1811 USB_DEVICE_REMOTE_WAKEUP
, 0,
1813 USB_CTRL_SET_TIMEOUT
);
1815 dev_dbg(&udev
->dev
, "disable remote "
1816 "wakeup, status %d\n", status
);
1821 /* resume interface drivers; if this is a hub, it
1822 * may have a child resume event to deal with soon
1824 resume
= udev
->dev
.bus
->resume
;
1825 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1826 struct device
*dev
=
1827 &udev
->actconfig
->interface
[i
]->dev
;
1835 } else if (udev
->devnum
<= 0) {
1836 dev_dbg(&udev
->dev
, "bogus resume!\n");
1842 #ifdef CONFIG_USB_SUSPEND
1845 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1849 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1851 /* see 7.1.7.7; affects power usage, but not budgeting */
1852 status
= clear_port_feature(hub
->hdev
,
1853 port1
, USB_PORT_FEAT_SUSPEND
);
1855 dev_dbg(hub
->intfdev
,
1856 "can't resume port %d, status %d\n",
1862 /* drive resume for at least 20 msec */
1864 dev_dbg(&udev
->dev
, "RESUME\n");
1867 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1868 | USB_PORT_STAT_ENABLE \
1869 | USB_PORT_STAT_CONNECTION)
1871 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1872 * stop resume signaling. Then finish the resume
1875 devstatus
= portchange
= 0;
1876 status
= hub_port_status(hub
, port1
,
1877 &devstatus
, &portchange
);
1879 || (devstatus
& LIVE_FLAGS
) != LIVE_FLAGS
1880 || (devstatus
& USB_PORT_STAT_SUSPEND
) != 0
1882 dev_dbg(hub
->intfdev
,
1883 "port %d status %04x.%04x after resume, %d\n",
1884 port1
, portchange
, devstatus
, status
);
1888 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1889 clear_port_feature(hub
->hdev
, port1
,
1890 USB_PORT_FEAT_C_SUSPEND
);
1891 /* TRSMRCY = 10 msec */
1894 status
= finish_device_resume(udev
);
1898 hub_port_logical_disconnect(hub
, port1
);
1906 * usb_resume_device - re-activate a suspended usb device
1907 * @udev: device to re-activate
1908 * Context: must be able to sleep; device not locked; pm locks held
1910 * This will re-activate the suspended device, increasing power usage
1911 * while letting drivers communicate again with its endpoints.
1912 * USB resume explicitly guarantees that the power session between
1913 * the host and the device is the same as it was when the device
1916 * Returns 0 on success, else negative errno.
1918 int usb_resume_device(struct usb_device
*udev
)
1922 if (udev
->state
== USB_STATE_NOTATTACHED
)
1925 /* selective resume of one downstream hub-to-device port */
1927 #ifdef CONFIG_USB_SUSPEND
1928 if (udev
->state
== USB_STATE_SUSPENDED
) {
1929 // NOTE swsusp may bork us, device state being wrong...
1930 // NOTE this fails if parent is also suspended...
1931 status
= hub_port_resume(hdev_to_hub(udev
->parent
),
1932 udev
->portnum
, udev
);
1937 status
= finish_device_resume(udev
);
1939 dev_dbg(&udev
->dev
, "can't resume, status %d\n",
1942 /* rebind drivers that had no suspend() */
1944 usb_unlock_device(udev
);
1945 bus_rescan_devices(&usb_bus_type
);
1946 usb_lock_device(udev
);
1951 static int remote_wakeup(struct usb_device
*udev
)
1955 #ifdef CONFIG_USB_SUSPEND
1957 /* don't repeat RESUME sequence if this device
1958 * was already woken up by some other task
1960 usb_lock_device(udev
);
1961 if (udev
->state
== USB_STATE_SUSPENDED
) {
1962 dev_dbg(&udev
->dev
, "RESUME (wakeup)\n");
1963 /* TRSMRCY = 10 msec */
1965 status
= finish_device_resume(udev
);
1967 usb_unlock_device(udev
);
1972 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1974 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1975 struct usb_device
*hdev
= hub
->hdev
;
1978 /* fail if children aren't already suspended */
1979 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1980 struct usb_device
*udev
;
1982 udev
= hdev
->children
[port1
-1];
1983 if (udev
&& (udev
->dev
.power
.power_state
.event
1985 #ifdef CONFIG_USB_SUSPEND
1986 || udev
->state
!= USB_STATE_SUSPENDED
1989 dev_dbg(&intf
->dev
, "port %d nyet suspended\n", port1
);
1994 /* "global suspend" of the downstream HC-to-USB interface */
1995 if (!hdev
->parent
) {
1996 struct usb_bus
*bus
= hdev
->bus
;
1998 int status
= hcd_bus_suspend (bus
);
2001 dev_dbg(&hdev
->dev
, "'global' suspend %d\n",
2009 /* stop khubd and related activity */
2014 static int hub_resume(struct usb_interface
*intf
)
2016 struct usb_device
*hdev
= interface_to_usbdev(intf
);
2017 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2020 /* "global resume" of the downstream HC-to-USB interface */
2021 if (!hdev
->parent
) {
2022 struct usb_bus
*bus
= hdev
->bus
;
2024 status
= hcd_bus_resume (bus
);
2026 dev_dbg(&intf
->dev
, "'global' resume %d\n",
2033 /* TRSMRCY = 10 msec */
2040 /* REVISIT: this recursion probably shouldn't exist. Remove
2041 * this code sometime, after retesting with different root and
2044 #ifdef CONFIG_USB_SUSPEND
2048 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
2049 struct usb_device
*udev
;
2050 u16 portstat
, portchange
;
2052 udev
= hdev
->children
[port1
-1];
2053 status
= hub_port_status(hub
, port1
, &portstat
, &portchange
);
2055 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2056 clear_port_feature(hdev
, port1
,
2057 USB_PORT_FEAT_C_SUSPEND
);
2058 portchange
&= ~USB_PORT_STAT_C_SUSPEND
;
2061 /* let khubd handle disconnects etc */
2066 if (!udev
|| status
< 0)
2068 usb_lock_device(udev
);
2069 if (portstat
& USB_PORT_STAT_SUSPEND
)
2070 status
= hub_port_resume(hub
, port1
, udev
);
2072 status
= finish_device_resume(udev
);
2074 dev_dbg(&intf
->dev
, "resume port %d --> %d\n",
2076 hub_port_logical_disconnect(hub
, port1
);
2079 usb_unlock_device(udev
);
2086 void usb_suspend_root_hub(struct usb_device
*hdev
)
2088 struct usb_hub
*hub
= hdev_to_hub(hdev
);
2090 /* This also makes any led blinker stop retriggering. We're called
2091 * from irq, so the blinker might still be scheduled. Caller promises
2092 * that the root hub status URB will be canceled.
2095 mark_quiesced(to_usb_interface(hub
->intfdev
));
2098 void usb_resume_root_hub(struct usb_device
*hdev
)
2100 struct usb_hub
*hub
= hdev_to_hub(hdev
);
2102 hub
->resume_root_hub
= 1;
2107 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2109 * Between connect detection and reset signaling there must be a delay
2110 * of 100ms at least for debounce and power-settling. The corresponding
2111 * timer shall restart whenever the downstream port detects a disconnect.
2113 * Apparently there are some bluetooth and irda-dongles and a number of
2114 * low-speed devices for which this debounce period may last over a second.
2115 * Not covered by the spec - but easy to deal with.
2117 * This implementation uses a 1500ms total debounce timeout; if the
2118 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2119 * every 25ms for transient disconnects. When the port status has been
2120 * unchanged for 100ms it returns the port status.
2123 #define HUB_DEBOUNCE_TIMEOUT 1500
2124 #define HUB_DEBOUNCE_STEP 25
2125 #define HUB_DEBOUNCE_STABLE 100
2127 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2130 int total_time
, stable_time
= 0;
2131 u16 portchange
, portstatus
;
2132 unsigned connection
= 0xffff;
2134 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2135 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2139 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2140 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2141 stable_time
+= HUB_DEBOUNCE_STEP
;
2142 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2146 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2149 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2150 clear_port_feature(hub
->hdev
, port1
,
2151 USB_PORT_FEAT_C_CONNECTION
);
2154 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2156 msleep(HUB_DEBOUNCE_STEP
);
2159 dev_dbg (hub
->intfdev
,
2160 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2161 port1
, total_time
, stable_time
, portstatus
);
2163 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2168 static void ep0_reinit(struct usb_device
*udev
)
2170 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2171 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2172 udev
->ep_in
[0] = udev
->ep_out
[0] = &udev
->ep0
;
2175 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2176 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2178 static int hub_set_address(struct usb_device
*udev
)
2182 if (udev
->devnum
== 0)
2184 if (udev
->state
== USB_STATE_ADDRESS
)
2186 if (udev
->state
!= USB_STATE_DEFAULT
)
2188 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2189 USB_REQ_SET_ADDRESS
, 0, udev
->devnum
, 0,
2190 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2192 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2198 /* Reset device, (re)assign address, get device descriptor.
2199 * Device connection must be stable, no more debouncing needed.
2200 * Returns device in USB_STATE_ADDRESS, except on error.
2202 * If this is called for an already-existing device (as part of
2203 * usb_reset_device), the caller must own the device lock. For a
2204 * newly detected device that is not accessible through any global
2205 * pointers, it's not necessary to lock the device.
2208 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2211 static DEFINE_MUTEX(usb_address0_mutex
);
2213 struct usb_device
*hdev
= hub
->hdev
;
2215 unsigned delay
= HUB_SHORT_RESET_TIME
;
2216 enum usb_device_speed oldspeed
= udev
->speed
;
2218 /* root hub ports have a slightly longer reset period
2219 * (from USB 2.0 spec, section 7.1.7.5)
2221 if (!hdev
->parent
) {
2222 delay
= HUB_ROOT_RESET_TIME
;
2223 if (port1
== hdev
->bus
->otg_port
)
2224 hdev
->bus
->b_hnp_enable
= 0;
2227 /* Some low speed devices have problems with the quick delay, so */
2228 /* be a bit pessimistic with those devices. RHbug #23670 */
2229 if (oldspeed
== USB_SPEED_LOW
)
2230 delay
= HUB_LONG_RESET_TIME
;
2232 mutex_lock(&usb_address0_mutex
);
2234 /* Reset the device; full speed may morph to high speed */
2235 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2236 if (retval
< 0) /* error or disconnect */
2238 /* success, speed is known */
2241 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2242 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2245 oldspeed
= udev
->speed
;
2247 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2248 * it's fixed size except for full speed devices.
2250 switch (udev
->speed
) {
2251 case USB_SPEED_HIGH
: /* fixed at 64 */
2252 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2254 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2255 /* to determine the ep0 maxpacket size, try to read
2256 * the device descriptor to get bMaxPacketSize0 and
2257 * then correct our initial guess.
2259 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2261 case USB_SPEED_LOW
: /* fixed at 8 */
2262 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2268 dev_info (&udev
->dev
,
2269 "%s %s speed USB device using %s and address %d\n",
2270 (udev
->config
) ? "reset" : "new",
2271 ({ char *speed
; switch (udev
->speed
) {
2272 case USB_SPEED_LOW
: speed
= "low"; break;
2273 case USB_SPEED_FULL
: speed
= "full"; break;
2274 case USB_SPEED_HIGH
: speed
= "high"; break;
2275 default: speed
= "?"; break;
2277 udev
->bus
->controller
->driver
->name
,
2280 /* Set up TT records, if needed */
2282 udev
->tt
= hdev
->tt
;
2283 udev
->ttport
= hdev
->ttport
;
2284 } else if (udev
->speed
!= USB_SPEED_HIGH
2285 && hdev
->speed
== USB_SPEED_HIGH
) {
2286 udev
->tt
= &hub
->tt
;
2287 udev
->ttport
= port1
;
2290 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2291 * Because device hardware and firmware is sometimes buggy in
2292 * this area, and this is how Linux has done it for ages.
2293 * Change it cautiously.
2295 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2296 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2297 * so it may help with some non-standards-compliant devices.
2298 * Otherwise we start with SET_ADDRESS and then try to read the
2299 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2302 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2303 if (USE_NEW_SCHEME(retry_counter
)) {
2304 struct usb_device_descriptor
*buf
;
2307 #define GET_DESCRIPTOR_BUFSIZE 64
2308 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2314 /* Use a short timeout the first time through,
2315 * so that recalcitrant full-speed devices with
2316 * 8- or 16-byte ep0-maxpackets won't slow things
2317 * down tremendously by NAKing the unexpectedly
2318 * early status stage. Also, retry on all errors;
2319 * some devices are flakey.
2321 for (j
= 0; j
< 3; ++j
) {
2322 buf
->bMaxPacketSize0
= 0;
2323 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2324 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2325 USB_DT_DEVICE
<< 8, 0,
2326 buf
, GET_DESCRIPTOR_BUFSIZE
,
2327 (i
? USB_CTRL_GET_TIMEOUT
: 1000));
2328 switch (buf
->bMaxPacketSize0
) {
2329 case 8: case 16: case 32: case 64:
2330 if (buf
->bDescriptorType
==
2344 udev
->descriptor
.bMaxPacketSize0
=
2345 buf
->bMaxPacketSize0
;
2348 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2349 if (retval
< 0) /* error or disconnect */
2351 if (oldspeed
!= udev
->speed
) {
2353 "device reset changed speed!\n");
2358 dev_err(&udev
->dev
, "device descriptor "
2359 "read/%s, error %d\n",
2364 #undef GET_DESCRIPTOR_BUFSIZE
2367 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2368 retval
= hub_set_address(udev
);
2375 "device not accepting address %d, error %d\n",
2376 udev
->devnum
, retval
);
2380 /* cope with hardware quirkiness:
2381 * - let SET_ADDRESS settle, some device hardware wants it
2382 * - read ep0 maxpacket even for high and low speed,
2385 if (USE_NEW_SCHEME(retry_counter
))
2388 retval
= usb_get_device_descriptor(udev
, 8);
2390 dev_err(&udev
->dev
, "device descriptor "
2391 "read/%s, error %d\n",
2403 i
= udev
->descriptor
.bMaxPacketSize0
;
2404 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2405 if (udev
->speed
!= USB_SPEED_FULL
||
2406 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2407 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2411 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2412 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2416 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2417 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2418 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2429 hub_port_disable(hub
, port1
, 0);
2430 mutex_unlock(&usb_address0_mutex
);
2435 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2437 struct usb_qualifier_descriptor
*qual
;
2440 qual
= kmalloc (sizeof *qual
, SLAB_KERNEL
);
2444 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2445 qual
, sizeof *qual
);
2446 if (status
== sizeof *qual
) {
2447 dev_info(&udev
->dev
, "not running at top speed; "
2448 "connect to a high speed hub\n");
2449 /* hub LEDs are probably harder to miss than syslog */
2450 if (hub
->has_indicators
) {
2451 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2452 schedule_work (&hub
->leds
);
2459 hub_power_remaining (struct usb_hub
*hub
)
2461 struct usb_device
*hdev
= hub
->hdev
;
2465 if (!hub
->limited_power
)
2468 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2469 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2470 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2476 /* Unconfigured devices may not use more than 100mA,
2477 * or 8mA for OTG ports */
2478 if (udev
->actconfig
)
2479 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2480 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2484 if (delta
> hub
->mA_per_port
)
2485 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2487 delta
, hub
->mA_per_port
, port1
);
2490 if (remaining
< 0) {
2491 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2498 /* Handle physical or logical connection change events.
2499 * This routine is called when:
2500 * a port connection-change occurs;
2501 * a port enable-change occurs (often caused by EMI);
2502 * usb_reset_device() encounters changed descriptors (as from
2503 * a firmware download)
2504 * caller already locked the hub
2506 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2507 u16 portstatus
, u16 portchange
)
2509 struct usb_device
*hdev
= hub
->hdev
;
2510 struct device
*hub_dev
= hub
->intfdev
;
2511 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2515 "port %d, status %04x, change %04x, %s\n",
2516 port1
, portstatus
, portchange
, portspeed (portstatus
));
2518 if (hub
->has_indicators
) {
2519 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2520 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2523 /* Disconnect any existing devices under this port */
2524 if (hdev
->children
[port1
-1])
2525 usb_disconnect(&hdev
->children
[port1
-1]);
2526 clear_bit(port1
, hub
->change_bits
);
2528 #ifdef CONFIG_USB_OTG
2529 /* during HNP, don't repeat the debounce */
2530 if (hdev
->bus
->is_b_host
)
2531 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2534 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2535 status
= hub_port_debounce(hub
, port1
);
2538 "connect-debounce failed, port %d disabled\n",
2542 portstatus
= status
;
2545 /* Return now if nothing is connected */
2546 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2548 /* maybe switch power back on (e.g. root hub was reset) */
2549 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2550 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2551 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2553 if (portstatus
& USB_PORT_STAT_ENABLE
)
2558 #ifdef CONFIG_USB_SUSPEND
2559 /* If something is connected, but the port is suspended, wake it up. */
2560 if (portstatus
& USB_PORT_STAT_SUSPEND
) {
2561 status
= hub_port_resume(hub
, port1
, NULL
);
2564 "can't clear suspend on port %d; %d\n",
2571 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2572 struct usb_device
*udev
;
2574 /* reallocate for each attempt, since references
2575 * to the previous one can escape in various ways
2577 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2580 "couldn't allocate port %d usb_device\n",
2585 usb_set_device_state(udev
, USB_STATE_POWERED
);
2586 udev
->speed
= USB_SPEED_UNKNOWN
;
2587 udev
->bus_mA
= hub
->mA_per_port
;
2589 /* set the address */
2590 choose_address(udev
);
2591 if (udev
->devnum
<= 0) {
2592 status
= -ENOTCONN
; /* Don't retry */
2596 /* reset and get descriptor */
2597 status
= hub_port_init(hub
, udev
, port1
, i
);
2601 /* consecutive bus-powered hubs aren't reliable; they can
2602 * violate the voltage drop budget. if the new child has
2603 * a "powered" LED, users should notice we didn't enable it
2604 * (without reading syslog), even without per-port LEDs
2607 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2608 && udev
->bus_mA
<= 100) {
2611 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2614 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2617 le16_to_cpus(&devstat
);
2618 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2620 "can't connect bus-powered hub "
2622 if (hub
->has_indicators
) {
2623 hub
->indicator
[port1
-1] =
2624 INDICATOR_AMBER_BLINK
;
2625 schedule_work (&hub
->leds
);
2627 status
= -ENOTCONN
; /* Don't retry */
2632 /* check for devices running slower than they could */
2633 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2634 && udev
->speed
== USB_SPEED_FULL
2635 && highspeed_hubs
!= 0)
2636 check_highspeed (hub
, udev
, port1
);
2638 /* Store the parent's children[] pointer. At this point
2639 * udev becomes globally accessible, although presumably
2640 * no one will look at it until hdev is unlocked.
2644 /* We mustn't add new devices if the parent hub has
2645 * been disconnected; we would race with the
2646 * recursively_mark_NOTATTACHED() routine.
2648 spin_lock_irq(&device_state_lock
);
2649 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2652 hdev
->children
[port1
-1] = udev
;
2653 spin_unlock_irq(&device_state_lock
);
2655 /* Run it through the hoops (find a driver, etc) */
2657 status
= usb_new_device(udev
);
2659 spin_lock_irq(&device_state_lock
);
2660 hdev
->children
[port1
-1] = NULL
;
2661 spin_unlock_irq(&device_state_lock
);
2668 status
= hub_power_remaining(hub
);
2670 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2675 hub_port_disable(hub
, port1
, 1);
2678 release_address(udev
);
2680 if (status
== -ENOTCONN
)
2685 hub_port_disable(hub
, port1
, 1);
2688 static void hub_events(void)
2690 struct list_head
*tmp
;
2691 struct usb_device
*hdev
;
2692 struct usb_interface
*intf
;
2693 struct usb_hub
*hub
;
2694 struct device
*hub_dev
;
2703 * We restart the list every time to avoid a deadlock with
2704 * deleting hubs downstream from this one. This should be
2705 * safe since we delete the hub from the event list.
2706 * Not the most efficient, but avoids deadlocks.
2710 /* Grab the first entry at the beginning of the list */
2711 spin_lock_irq(&hub_event_lock
);
2712 if (list_empty(&hub_event_list
)) {
2713 spin_unlock_irq(&hub_event_lock
);
2717 tmp
= hub_event_list
.next
;
2720 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2722 intf
= to_usb_interface(hub
->intfdev
);
2723 hub_dev
= &intf
->dev
;
2725 i
= hub
->resume_root_hub
;
2727 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x%s\n",
2728 hdev
->state
, hub
->descriptor
2729 ? hub
->descriptor
->bNbrPorts
2731 /* NOTE: expects max 15 ports... */
2732 (u16
) hub
->change_bits
[0],
2733 (u16
) hub
->event_bits
[0],
2734 i
? ", resume root" : "");
2737 spin_unlock_irq(&hub_event_lock
);
2739 /* Is this is a root hub wanting to reactivate the downstream
2740 * ports? If so, be sure the interface resumes even if its
2741 * stub "device" node was never suspended.
2744 dpm_runtime_resume(&hdev
->dev
);
2745 dpm_runtime_resume(&intf
->dev
);
2750 /* Lock the device, then check to see if we were
2751 * disconnected while waiting for the lock to succeed. */
2752 if (locktree(hdev
) < 0) {
2756 if (hub
!= usb_get_intfdata(intf
))
2759 /* If the hub has died, clean up after it */
2760 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2761 hub
->error
= -ENODEV
;
2762 hub_pre_reset(intf
);
2766 /* If this is an inactive or suspended hub, do nothing */
2771 dev_dbg (hub_dev
, "resetting for error %d\n",
2774 ret
= usb_reset_composite_device(hdev
, intf
);
2777 "error resetting hub: %d\n", ret
);
2785 /* deal with port status changes */
2786 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2787 if (test_bit(i
, hub
->busy_bits
))
2789 connect_change
= test_bit(i
, hub
->change_bits
);
2790 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2791 !connect_change
&& !hub
->activating
)
2794 ret
= hub_port_status(hub
, i
,
2795 &portstatus
, &portchange
);
2799 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2801 USB_PORT_STAT_CONNECTION
))
2804 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2805 clear_port_feature(hdev
, i
,
2806 USB_PORT_FEAT_C_CONNECTION
);
2810 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2811 if (!connect_change
)
2813 "port %d enable change, "
2816 clear_port_feature(hdev
, i
,
2817 USB_PORT_FEAT_C_ENABLE
);
2820 * EM interference sometimes causes badly
2821 * shielded USB devices to be shutdown by
2822 * the hub, this hack enables them again.
2823 * Works at least with mouse driver.
2825 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2827 && hdev
->children
[i
-1]) {
2830 "disabled by hub (EMI?), "
2837 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2838 clear_port_feature(hdev
, i
,
2839 USB_PORT_FEAT_C_SUSPEND
);
2840 if (hdev
->children
[i
-1]) {
2841 ret
= remote_wakeup(hdev
->
2847 hub_port_disable(hub
, i
, 1);
2850 "resume on port %d, status %d\n",
2854 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2856 "over-current change on port %d\n",
2858 clear_port_feature(hdev
, i
,
2859 USB_PORT_FEAT_C_OVER_CURRENT
);
2863 if (portchange
& USB_PORT_STAT_C_RESET
) {
2865 "reset change on port %d\n",
2867 clear_port_feature(hdev
, i
,
2868 USB_PORT_FEAT_C_RESET
);
2872 hub_port_connect_change(hub
, i
,
2873 portstatus
, portchange
);
2876 /* deal with hub status changes */
2877 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2879 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2880 dev_err (hub_dev
, "get_hub_status failed\n");
2882 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2883 dev_dbg (hub_dev
, "power change\n");
2884 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2885 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2886 /* FIXME: Is this always true? */
2887 hub
->limited_power
= 0;
2889 hub
->limited_power
= 1;
2891 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2892 dev_dbg (hub_dev
, "overcurrent change\n");
2893 msleep(500); /* Cool down */
2894 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2899 hub
->activating
= 0;
2901 /* If this is a root hub, tell the HCD it's okay to
2902 * re-enable port-change interrupts now. */
2904 usb_enable_root_hub_irq(hdev
->bus
);
2907 usb_unlock_device(hdev
);
2910 } /* end while (1) */
2913 static int hub_thread(void *__unused
)
2917 wait_event_interruptible(khubd_wait
,
2918 !list_empty(&hub_event_list
) ||
2919 kthread_should_stop());
2921 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2923 pr_debug("%s: khubd exiting\n", usbcore_name
);
2927 static struct usb_device_id hub_id_table
[] = {
2928 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2929 .bDeviceClass
= USB_CLASS_HUB
},
2930 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2931 .bInterfaceClass
= USB_CLASS_HUB
},
2932 { } /* Terminating entry */
2935 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2937 static struct usb_driver hub_driver
= {
2940 .disconnect
= hub_disconnect
,
2941 .suspend
= hub_suspend
,
2942 .resume
= hub_resume
,
2943 .pre_reset
= hub_pre_reset
,
2944 .post_reset
= hub_post_reset
,
2946 .id_table
= hub_id_table
,
2949 int usb_hub_init(void)
2951 if (usb_register(&hub_driver
) < 0) {
2952 printk(KERN_ERR
"%s: can't register hub driver\n",
2957 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2958 if (!IS_ERR(khubd_task
))
2961 /* Fall through if kernel_thread failed */
2962 usb_deregister(&hub_driver
);
2963 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2968 void usb_hub_cleanup(void)
2970 kthread_stop(khubd_task
);
2973 * Hub resources are freed for us by usb_deregister. It calls
2974 * usb_driver_purge on every device which in turn calls that
2975 * devices disconnect function if it is using this driver.
2976 * The hub_disconnect function takes care of releasing the
2977 * individual hub resources. -greg
2979 usb_deregister(&hub_driver
);
2980 } /* usb_hub_cleanup() */
2982 static int config_descriptors_changed(struct usb_device
*udev
)
2986 struct usb_config_descriptor
*buf
;
2988 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2989 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2990 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2992 buf
= kmalloc (len
, SLAB_KERNEL
);
2994 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2995 /* assume the worst */
2998 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3000 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3002 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
3004 if (length
< old_length
) {
3005 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
3009 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
3011 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
3012 index
, buf
->bConfigurationValue
);
3017 return index
!= udev
->descriptor
.bNumConfigurations
;
3021 * usb_reset_device - perform a USB port reset to reinitialize a device
3022 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3024 * WARNING - don't use this routine to reset a composite device
3025 * (one with multiple interfaces owned by separate drivers)!
3026 * Use usb_reset_composite_device() instead.
3028 * Do a port reset, reassign the device's address, and establish its
3029 * former operating configuration. If the reset fails, or the device's
3030 * descriptors change from their values before the reset, or the original
3031 * configuration and altsettings cannot be restored, a flag will be set
3032 * telling khubd to pretend the device has been disconnected and then
3033 * re-connected. All drivers will be unbound, and the device will be
3034 * re-enumerated and probed all over again.
3036 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3037 * flagged for logical disconnection, or some other negative error code
3038 * if the reset wasn't even attempted.
3040 * The caller must own the device lock. For example, it's safe to use
3041 * this from a driver probe() routine after downloading new firmware.
3042 * For calls that might not occur during probe(), drivers should lock
3043 * the device using usb_lock_device_for_reset().
3045 int usb_reset_device(struct usb_device
*udev
)
3047 struct usb_device
*parent_hdev
= udev
->parent
;
3048 struct usb_hub
*parent_hub
;
3049 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3051 int port1
= udev
->portnum
;
3053 if (udev
->state
== USB_STATE_NOTATTACHED
||
3054 udev
->state
== USB_STATE_SUSPENDED
) {
3055 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3061 /* this requires hcd-specific logic; see OHCI hc_restart() */
3062 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
3065 parent_hub
= hdev_to_hub(parent_hdev
);
3067 set_bit(port1
, parent_hub
->busy_bits
);
3068 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3070 /* ep0 maxpacket size may change; let the HCD know about it.
3071 * Other endpoints will be handled by re-enumeration. */
3073 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3077 clear_bit(port1
, parent_hub
->busy_bits
);
3081 /* Device might have changed firmware (DFU or similar) */
3082 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
3083 || config_descriptors_changed (udev
)) {
3084 dev_info(&udev
->dev
, "device firmware changed\n");
3085 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3089 if (!udev
->actconfig
)
3092 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3093 USB_REQ_SET_CONFIGURATION
, 0,
3094 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3095 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3098 "can't restore configuration #%d (error=%d)\n",
3099 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3102 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3104 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3105 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3106 struct usb_interface_descriptor
*desc
;
3108 /* set_interface resets host side toggle even
3109 * for altsetting zero. the interface may have no driver.
3111 desc
= &intf
->cur_altsetting
->desc
;
3112 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3113 desc
->bAlternateSetting
);
3115 dev_err(&udev
->dev
, "failed to restore interface %d "
3116 "altsetting %d (error=%d)\n",
3117 desc
->bInterfaceNumber
,
3118 desc
->bAlternateSetting
,
3128 hub_port_logical_disconnect(parent_hub
, port1
);
3133 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3134 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3135 * @iface: interface bound to the driver making the request (optional)
3137 * Warns all drivers bound to registered interfaces (using their pre_reset
3138 * method), performs the port reset, and then lets the drivers know that
3139 * the reset is over (using their post_reset method).
3141 * Return value is the same as for usb_reset_device().
3143 * The caller must own the device lock. For example, it's safe to use
3144 * this from a driver probe() routine after downloading new firmware.
3145 * For calls that might not occur during probe(), drivers should lock
3146 * the device using usb_lock_device_for_reset().
3148 * The interface locks are acquired during the pre_reset stage and released
3149 * during the post_reset stage. However if iface is not NULL and is
3150 * currently being probed, we assume that the caller already owns its
3153 int usb_reset_composite_device(struct usb_device
*udev
,
3154 struct usb_interface
*iface
)
3157 struct usb_host_config
*config
= udev
->actconfig
;
3159 if (udev
->state
== USB_STATE_NOTATTACHED
||
3160 udev
->state
== USB_STATE_SUSPENDED
) {
3161 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3166 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3171 struct usb_interface
*cintf
;
3172 struct usb_driver
*drv
;
3174 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3175 cintf
= config
->interface
[i
];
3177 down(&cintf
->dev
.sem
);
3178 if (device_is_registered(&cintf
->dev
) &&
3179 cintf
->dev
.driver
) {
3180 drv
= to_usb_driver(cintf
->dev
.driver
);
3182 (drv
->pre_reset
)(cintf
);
3187 ret
= usb_reset_device(udev
);
3191 struct usb_interface
*cintf
;
3192 struct usb_driver
*drv
;
3194 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3195 cintf
= config
->interface
[i
];
3196 if (device_is_registered(&cintf
->dev
) &&
3197 cintf
->dev
.driver
) {
3198 drv
= to_usb_driver(cintf
->dev
.driver
);
3199 if (drv
->post_reset
)
3200 (drv
->post_reset
)(cintf
);
3203 up(&cintf
->dev
.sem
);