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
;
38 struct urb
*urb
; /* for interrupt polling pipe */
40 /* buffer for urb ... with extra space in case of babble */
42 dma_addr_t buffer_dma
; /* DMA address for buffer */
44 struct usb_hub_status hub
;
45 struct usb_port_status port
;
46 } *status
; /* buffer for status reports */
47 struct mutex status_mutex
; /* for the status buffer */
49 int error
; /* last reported error */
50 int nerrors
; /* track consecutive errors */
52 struct list_head event_list
; /* hubs w/data or errs ready */
53 unsigned long event_bits
[1]; /* status change bitmask */
54 unsigned long change_bits
[1]; /* ports with logical connect
56 unsigned long busy_bits
[1]; /* ports being reset or
58 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
59 #error event_bits[] is too short!
62 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
63 struct usb_tt tt
; /* Transaction Translator */
65 unsigned mA_per_port
; /* current for each child */
67 unsigned limited_power
:1;
69 unsigned activating
:1;
70 unsigned disconnected
:1;
72 unsigned has_indicators
:1;
73 u8 indicator
[USB_MAXCHILDREN
];
74 struct delayed_work leds
;
78 /* Protect struct usb_device->state and ->children members
79 * Note: Both are also protected by ->dev.sem, except that ->state can
80 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
81 static DEFINE_SPINLOCK(device_state_lock
);
83 /* khubd's worklist and its lock */
84 static DEFINE_SPINLOCK(hub_event_lock
);
85 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
88 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
90 static struct task_struct
*khubd_task
;
92 /* cycle leds on hubs that aren't blinking for attention */
93 static int blinkenlights
= 0;
94 module_param (blinkenlights
, bool, S_IRUGO
);
95 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
98 * As of 2.6.10 we introduce a new USB device initialization scheme which
99 * closely resembles the way Windows works. Hopefully it will be compatible
100 * with a wider range of devices than the old scheme. However some previously
101 * working devices may start giving rise to "device not accepting address"
102 * errors; if that happens the user can try the old scheme by adjusting the
103 * following module parameters.
105 * For maximum flexibility there are two boolean parameters to control the
106 * hub driver's behavior. On the first initialization attempt, if the
107 * "old_scheme_first" parameter is set then the old scheme will be used,
108 * otherwise the new scheme is used. If that fails and "use_both_schemes"
109 * is set, then the driver will make another attempt, using the other scheme.
111 static int old_scheme_first
= 0;
112 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
113 MODULE_PARM_DESC(old_scheme_first
,
114 "start with the old device initialization scheme");
116 static int use_both_schemes
= 1;
117 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
118 MODULE_PARM_DESC(use_both_schemes
,
119 "try the other device initialization scheme if the "
123 static inline char *portspeed(int portstatus
)
125 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
127 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
133 /* Note that hdev or one of its children must be locked! */
134 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
136 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
139 /* USB 2.0 spec Section 11.24.4.5 */
140 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
144 for (i
= 0; i
< 3; i
++) {
145 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
146 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
147 USB_DT_HUB
<< 8, 0, data
, size
,
148 USB_CTRL_GET_TIMEOUT
);
149 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
156 * USB 2.0 spec Section 11.24.2.1
158 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
160 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
161 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
165 * USB 2.0 spec Section 11.24.2.2
167 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
169 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
170 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
175 * USB 2.0 spec Section 11.24.2.13
177 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
179 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
180 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
185 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
186 * for info about using port indicators
188 static void set_port_led(
194 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
195 USB_PORT_FEAT_INDICATOR
);
197 dev_dbg (hub
->intfdev
,
198 "port %d indicator %s status %d\n",
200 ({ char *s
; switch (selector
) {
201 case HUB_LED_AMBER
: s
= "amber"; break;
202 case HUB_LED_GREEN
: s
= "green"; break;
203 case HUB_LED_OFF
: s
= "off"; break;
204 case HUB_LED_AUTO
: s
= "auto"; break;
205 default: s
= "??"; break;
210 #define LED_CYCLE_PERIOD ((2*HZ)/3)
212 static void led_work (struct work_struct
*work
)
214 struct usb_hub
*hub
=
215 container_of(work
, struct usb_hub
, leds
.work
);
216 struct usb_device
*hdev
= hub
->hdev
;
218 unsigned changed
= 0;
221 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
224 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
225 unsigned selector
, mode
;
227 /* 30%-50% duty cycle */
229 switch (hub
->indicator
[i
]) {
231 case INDICATOR_CYCLE
:
233 selector
= HUB_LED_AUTO
;
234 mode
= INDICATOR_AUTO
;
236 /* blinking green = sw attention */
237 case INDICATOR_GREEN_BLINK
:
238 selector
= HUB_LED_GREEN
;
239 mode
= INDICATOR_GREEN_BLINK_OFF
;
241 case INDICATOR_GREEN_BLINK_OFF
:
242 selector
= HUB_LED_OFF
;
243 mode
= INDICATOR_GREEN_BLINK
;
245 /* blinking amber = hw attention */
246 case INDICATOR_AMBER_BLINK
:
247 selector
= HUB_LED_AMBER
;
248 mode
= INDICATOR_AMBER_BLINK_OFF
;
250 case INDICATOR_AMBER_BLINK_OFF
:
251 selector
= HUB_LED_OFF
;
252 mode
= INDICATOR_AMBER_BLINK
;
254 /* blink green/amber = reserved */
255 case INDICATOR_ALT_BLINK
:
256 selector
= HUB_LED_GREEN
;
257 mode
= INDICATOR_ALT_BLINK_OFF
;
259 case INDICATOR_ALT_BLINK_OFF
:
260 selector
= HUB_LED_AMBER
;
261 mode
= INDICATOR_ALT_BLINK
;
266 if (selector
!= HUB_LED_AUTO
)
268 set_port_led(hub
, i
+ 1, selector
);
269 hub
->indicator
[i
] = mode
;
271 if (!changed
&& blinkenlights
) {
273 cursor
%= hub
->descriptor
->bNbrPorts
;
274 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
275 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
279 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
282 /* use a short timeout for hub/port status fetches */
283 #define USB_STS_TIMEOUT 1000
284 #define USB_STS_RETRIES 5
287 * USB 2.0 spec Section 11.24.2.6
289 static int get_hub_status(struct usb_device
*hdev
,
290 struct usb_hub_status
*data
)
292 int i
, status
= -ETIMEDOUT
;
294 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
295 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
296 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
297 data
, sizeof(*data
), USB_STS_TIMEOUT
);
303 * USB 2.0 spec Section 11.24.2.7
305 static int get_port_status(struct usb_device
*hdev
, int port1
,
306 struct usb_port_status
*data
)
308 int i
, status
= -ETIMEDOUT
;
310 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
311 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
312 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
313 data
, sizeof(*data
), USB_STS_TIMEOUT
);
318 static void kick_khubd(struct usb_hub
*hub
)
322 /* Suppress autosuspend until khubd runs */
323 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
325 spin_lock_irqsave(&hub_event_lock
, flags
);
326 if (!hub
->disconnected
& list_empty(&hub
->event_list
)) {
327 list_add_tail(&hub
->event_list
, &hub_event_list
);
328 wake_up(&khubd_wait
);
330 spin_unlock_irqrestore(&hub_event_lock
, flags
);
333 void usb_kick_khubd(struct usb_device
*hdev
)
335 /* FIXME: What if hdev isn't bound to the hub driver? */
336 kick_khubd(hdev_to_hub(hdev
));
340 /* completion function, fires on port status changes and various faults */
341 static void hub_irq(struct urb
*urb
)
343 struct usb_hub
*hub
= urb
->context
;
348 switch (urb
->status
) {
349 case -ENOENT
: /* synchronous unlink */
350 case -ECONNRESET
: /* async unlink */
351 case -ESHUTDOWN
: /* hardware going away */
354 default: /* presumably an error */
355 /* Cause a hub reset after 10 consecutive errors */
356 dev_dbg (hub
->intfdev
, "transfer --> %d\n", urb
->status
);
357 if ((++hub
->nerrors
< 10) || hub
->error
)
359 hub
->error
= urb
->status
;
362 /* let khubd handle things */
363 case 0: /* we got data: port status changed */
365 for (i
= 0; i
< urb
->actual_length
; ++i
)
366 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
368 hub
->event_bits
[0] = bits
;
374 /* Something happened, let khubd figure it out */
381 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
382 && status
!= -ENODEV
&& status
!= -EPERM
)
383 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
386 /* USB 2.0 spec Section 11.24.2.3 */
388 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
390 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
391 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
396 * enumeration blocks khubd for a long time. we use keventd instead, since
397 * long blocking there is the exception, not the rule. accordingly, HCDs
398 * talking to TTs must queue control transfers (not just bulk and iso), so
399 * both can talk to the same hub concurrently.
401 static void hub_tt_kevent (struct work_struct
*work
)
403 struct usb_hub
*hub
=
404 container_of(work
, struct usb_hub
, tt
.kevent
);
407 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
408 while (!list_empty (&hub
->tt
.clear_list
)) {
409 struct list_head
*temp
;
410 struct usb_tt_clear
*clear
;
411 struct usb_device
*hdev
= hub
->hdev
;
414 temp
= hub
->tt
.clear_list
.next
;
415 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
416 list_del (&clear
->clear_list
);
418 /* drop lock so HCD can concurrently report other TT errors */
419 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
420 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
421 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
425 "clear tt %d (%04x) error %d\n",
426 clear
->tt
, clear
->devinfo
, status
);
429 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
433 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
434 * @udev: the device whose split transaction failed
435 * @pipe: identifies the endpoint of the failed transaction
437 * High speed HCDs use this to tell the hub driver that some split control or
438 * bulk transaction failed in a way that requires clearing internal state of
439 * a transaction translator. This is normally detected (and reported) from
442 * It may not be possible for that hub to handle additional full (or low)
443 * speed transactions until that state is fully cleared out.
445 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
447 struct usb_tt
*tt
= udev
->tt
;
449 struct usb_tt_clear
*clear
;
451 /* we've got to cope with an arbitrary number of pending TT clears,
452 * since each TT has "at least two" buffers that can need it (and
453 * there can be many TTs per hub). even if they're uncommon.
455 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
456 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
457 /* FIXME recover somehow ... RESET_TT? */
461 /* info that CLEAR_TT_BUFFER needs */
462 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
463 clear
->devinfo
= usb_pipeendpoint (pipe
);
464 clear
->devinfo
|= udev
->devnum
<< 4;
465 clear
->devinfo
|= usb_pipecontrol (pipe
)
466 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
467 : (USB_ENDPOINT_XFER_BULK
<< 11);
468 if (usb_pipein (pipe
))
469 clear
->devinfo
|= 1 << 15;
471 /* tell keventd to clear state for this TT */
472 spin_lock_irqsave (&tt
->lock
, flags
);
473 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
474 schedule_work (&tt
->kevent
);
475 spin_unlock_irqrestore (&tt
->lock
, flags
);
478 static void hub_power_on(struct usb_hub
*hub
)
481 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
482 u16 wHubCharacteristics
=
483 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
485 /* Enable power on each port. Some hubs have reserved values
486 * of LPSM (> 2) in their descriptors, even though they are
487 * USB 2.0 hubs. Some hubs do not implement port-power switching
488 * but only emulate it. In all cases, the ports won't work
489 * unless we send these messages to the hub.
491 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
492 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
494 dev_dbg(hub
->intfdev
, "trying to enable port power on "
495 "non-switchable hub\n");
496 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
497 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
499 /* Wait at least 100 msec for power to become stable */
500 msleep(max(pgood_delay
, (unsigned) 100));
503 static void hub_quiesce(struct usb_hub
*hub
)
505 /* (nonblocking) khubd and related activity won't re-trigger */
509 /* (blocking) stop khubd and related activity */
510 usb_kill_urb(hub
->urb
);
511 if (hub
->has_indicators
)
512 cancel_delayed_work(&hub
->leds
);
513 if (hub
->has_indicators
|| hub
->tt
.hub
)
514 flush_scheduled_work();
517 static void hub_activate(struct usb_hub
*hub
)
524 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
526 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
527 if (hub
->has_indicators
&& blinkenlights
)
528 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
530 /* scan all ports ASAP */
534 static int hub_hub_status(struct usb_hub
*hub
,
535 u16
*status
, u16
*change
)
539 mutex_lock(&hub
->status_mutex
);
540 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
542 dev_err (hub
->intfdev
,
543 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
545 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
546 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
549 mutex_unlock(&hub
->status_mutex
);
553 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
555 struct usb_device
*hdev
= hub
->hdev
;
558 if (hdev
->children
[port1
-1] && set_state
)
559 usb_set_device_state(hdev
->children
[port1
-1],
560 USB_STATE_NOTATTACHED
);
562 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
564 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
570 * Disable a port and mark a logical connnect-change event, so that some
571 * time later khubd will disconnect() any existing usb_device on the port
572 * and will re-enumerate if there actually is a device attached.
574 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
576 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
577 hub_port_disable(hub
, port1
, 1);
579 /* FIXME let caller ask to power down the port:
580 * - some devices won't enumerate without a VBUS power cycle
581 * - SRP saves power that way
582 * - ... new call, TBD ...
583 * That's easy if this hub can switch power per-port, and
584 * khubd reactivates the port later (timer, SRP, etc).
585 * Powerdown must be optional, because of reset/DFU.
588 set_bit(port1
, hub
->change_bits
);
592 static void disconnect_all_children(struct usb_hub
*hub
, int logical
)
594 struct usb_device
*hdev
= hub
->hdev
;
597 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
598 if (hdev
->children
[port1
-1]) {
600 hub_port_logical_disconnect(hub
, port1
);
602 usb_disconnect(&hdev
->children
[port1
-1]);
607 #ifdef CONFIG_USB_PERSIST
609 #define USB_PERSIST 1
611 /* For "persistent-device" resets we must mark the child devices for reset
612 * and turn off a possible connect-change status (so khubd won't disconnect
615 static void mark_children_for_reset_resume(struct usb_hub
*hub
)
617 struct usb_device
*hdev
= hub
->hdev
;
620 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
621 struct usb_device
*child
= hdev
->children
[port1
-1];
624 child
->reset_resume
= 1;
625 clear_port_feature(hdev
, port1
,
626 USB_PORT_FEAT_C_CONNECTION
);
633 #define USB_PERSIST 0
635 static inline void mark_children_for_reset_resume(struct usb_hub
*hub
)
638 #endif /* CONFIG_USB_PERSIST */
640 /* caller has locked the hub device */
641 static void hub_pre_reset(struct usb_interface
*intf
)
643 struct usb_hub
*hub
= usb_get_intfdata(intf
);
645 /* This routine doesn't run as part of a reset-resume, so it's safe
646 * to disconnect all the drivers below the hub.
648 disconnect_all_children(hub
, 0);
652 /* caller has locked the hub device */
653 static void hub_post_reset(struct usb_interface
*intf
, int reset_resume
)
655 struct usb_hub
*hub
= usb_get_intfdata(intf
);
660 mark_children_for_reset_resume(hub
);
662 /* Reset-resume doesn't call pre_reset, so we have to
663 * disconnect the children here. But we may not lock
664 * the child devices, so we have to do a "logical"
667 disconnect_all_children(hub
, 1);
674 static int hub_configure(struct usb_hub
*hub
,
675 struct usb_endpoint_descriptor
*endpoint
)
677 struct usb_device
*hdev
= hub
->hdev
;
678 struct device
*hub_dev
= hub
->intfdev
;
679 u16 hubstatus
, hubchange
;
680 u16 wHubCharacteristics
;
685 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
688 message
= "can't allocate hub irq buffer";
693 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
695 message
= "can't kmalloc hub status buffer";
699 mutex_init(&hub
->status_mutex
);
701 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
702 if (!hub
->descriptor
) {
703 message
= "can't kmalloc hub descriptor";
708 /* Request the entire hub descriptor.
709 * hub->descriptor can handle USB_MAXCHILDREN ports,
710 * but the hub can/will return fewer bytes here.
712 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
713 sizeof(*hub
->descriptor
));
715 message
= "can't read hub descriptor";
717 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
718 message
= "hub has too many ports!";
723 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
724 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
725 (hdev
->maxchild
== 1) ? "" : "s");
727 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
729 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
731 char portstr
[USB_MAXCHILDREN
+ 1];
733 for (i
= 0; i
< hdev
->maxchild
; i
++)
734 portstr
[i
] = hub
->descriptor
->DeviceRemovable
735 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
737 portstr
[hdev
->maxchild
] = 0;
738 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
740 dev_dbg(hub_dev
, "standalone hub\n");
742 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
744 dev_dbg(hub_dev
, "ganged power switching\n");
747 dev_dbg(hub_dev
, "individual port power switching\n");
751 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
755 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
757 dev_dbg(hub_dev
, "global over-current protection\n");
760 dev_dbg(hub_dev
, "individual port over-current protection\n");
764 dev_dbg(hub_dev
, "no over-current protection\n");
768 spin_lock_init (&hub
->tt
.lock
);
769 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
770 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
);
771 switch (hdev
->descriptor
.bDeviceProtocol
) {
775 dev_dbg(hub_dev
, "Single TT\n");
779 ret
= usb_set_interface(hdev
, 0, 1);
781 dev_dbg(hub_dev
, "TT per port\n");
784 dev_err(hub_dev
, "Using single TT (err %d)\n",
789 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
790 hdev
->descriptor
.bDeviceProtocol
);
794 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
795 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
796 case HUB_TTTT_8_BITS
:
797 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
798 hub
->tt
.think_time
= 666;
799 dev_dbg(hub_dev
, "TT requires at most %d "
800 "FS bit times (%d ns)\n",
801 8, hub
->tt
.think_time
);
804 case HUB_TTTT_16_BITS
:
805 hub
->tt
.think_time
= 666 * 2;
806 dev_dbg(hub_dev
, "TT requires at most %d "
807 "FS bit times (%d ns)\n",
808 16, hub
->tt
.think_time
);
810 case HUB_TTTT_24_BITS
:
811 hub
->tt
.think_time
= 666 * 3;
812 dev_dbg(hub_dev
, "TT requires at most %d "
813 "FS bit times (%d ns)\n",
814 24, hub
->tt
.think_time
);
816 case HUB_TTTT_32_BITS
:
817 hub
->tt
.think_time
= 666 * 4;
818 dev_dbg(hub_dev
, "TT requires at most %d "
819 "FS bit times (%d ns)\n",
820 32, hub
->tt
.think_time
);
824 /* probe() zeroes hub->indicator[] */
825 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
826 hub
->has_indicators
= 1;
827 dev_dbg(hub_dev
, "Port indicators are supported\n");
830 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
831 hub
->descriptor
->bPwrOn2PwrGood
* 2);
833 /* power budgeting mostly matters with bus-powered hubs,
834 * and battery-powered root hubs (may provide just 8 mA).
836 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
838 message
= "can't get hub status";
841 le16_to_cpus(&hubstatus
);
842 if (hdev
== hdev
->bus
->root_hub
) {
843 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
844 hub
->mA_per_port
= 500;
846 hub
->mA_per_port
= hdev
->bus_mA
;
847 hub
->limited_power
= 1;
849 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
850 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
851 hub
->descriptor
->bHubContrCurrent
);
852 hub
->limited_power
= 1;
853 if (hdev
->maxchild
> 0) {
854 int remaining
= hdev
->bus_mA
-
855 hub
->descriptor
->bHubContrCurrent
;
857 if (remaining
< hdev
->maxchild
* 100)
859 "insufficient power available "
860 "to use all downstream ports\n");
861 hub
->mA_per_port
= 100; /* 7.2.1.1 */
863 } else { /* Self-powered external hub */
864 /* FIXME: What about battery-powered external hubs that
865 * provide less current per port? */
866 hub
->mA_per_port
= 500;
868 if (hub
->mA_per_port
< 500)
869 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
872 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
874 message
= "can't get hub status";
878 /* local power status reports aren't always correct */
879 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
880 dev_dbg(hub_dev
, "local power source is %s\n",
881 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
882 ? "lost (inactive)" : "good");
884 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
885 dev_dbg(hub_dev
, "%sover-current condition exists\n",
886 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
888 /* set up the interrupt endpoint
889 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
890 * bytes as USB2.0[11.12.3] says because some hubs are known
891 * to send more data (and thus cause overflow). For root hubs,
892 * maxpktsize is defined in hcd.c's fake endpoint descriptors
893 * to be big enough for at least USB_MAXCHILDREN ports. */
894 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
895 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
897 if (maxp
> sizeof(*hub
->buffer
))
898 maxp
= sizeof(*hub
->buffer
);
900 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
902 message
= "couldn't allocate interrupt urb";
907 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
908 hub
, endpoint
->bInterval
);
909 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
910 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
912 /* maybe cycle the hub leds */
913 if (hub
->has_indicators
&& blinkenlights
)
914 hub
->indicator
[0] = INDICATOR_CYCLE
;
921 dev_err (hub_dev
, "config failed, %s (err %d)\n",
923 /* hub_disconnect() frees urb and descriptor */
927 static void hub_release(struct kref
*kref
)
929 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
931 usb_put_intf(to_usb_interface(hub
->intfdev
));
935 static unsigned highspeed_hubs
;
937 static void hub_disconnect(struct usb_interface
*intf
)
939 struct usb_hub
*hub
= usb_get_intfdata (intf
);
941 /* Take the hub off the event list and don't let it be added again */
942 spin_lock_irq(&hub_event_lock
);
943 list_del_init(&hub
->event_list
);
944 hub
->disconnected
= 1;
945 spin_unlock_irq(&hub_event_lock
);
947 /* Disconnect all children and quiesce the hub */
951 usb_set_intfdata (intf
, NULL
);
953 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
956 usb_free_urb(hub
->urb
);
957 kfree(hub
->descriptor
);
959 usb_buffer_free(hub
->hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
962 kref_put(&hub
->kref
, hub_release
);
965 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
967 struct usb_host_interface
*desc
;
968 struct usb_endpoint_descriptor
*endpoint
;
969 struct usb_device
*hdev
;
972 desc
= intf
->cur_altsetting
;
973 hdev
= interface_to_usbdev(intf
);
975 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
977 dev_warn(&intf
->dev
, "ignoring external hub\n");
982 /* Some hubs have a subclass of 1, which AFAICT according to the */
983 /* specs is not defined, but it works */
984 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
985 (desc
->desc
.bInterfaceSubClass
!= 1)) {
987 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
991 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
992 if (desc
->desc
.bNumEndpoints
!= 1)
993 goto descriptor_error
;
995 endpoint
= &desc
->endpoint
[0].desc
;
997 /* If it's not an interrupt in endpoint, we'd better punt! */
998 if (!usb_endpoint_is_int_in(endpoint
))
999 goto descriptor_error
;
1001 /* We found a hub */
1002 dev_info (&intf
->dev
, "USB hub found\n");
1004 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1006 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1010 kref_init(&hub
->kref
);
1011 INIT_LIST_HEAD(&hub
->event_list
);
1012 hub
->intfdev
= &intf
->dev
;
1014 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1017 usb_set_intfdata (intf
, hub
);
1018 intf
->needs_remote_wakeup
= 1;
1020 if (hdev
->speed
== USB_SPEED_HIGH
)
1023 if (hub_configure(hub
, endpoint
) >= 0)
1026 hub_disconnect (intf
);
1031 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1033 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1035 /* assert ifno == 0 (part of hub spec) */
1037 case USBDEVFS_HUB_PORTINFO
: {
1038 struct usbdevfs_hub_portinfo
*info
= user_data
;
1041 spin_lock_irq(&device_state_lock
);
1042 if (hdev
->devnum
<= 0)
1045 info
->nports
= hdev
->maxchild
;
1046 for (i
= 0; i
< info
->nports
; i
++) {
1047 if (hdev
->children
[i
] == NULL
)
1051 hdev
->children
[i
]->devnum
;
1054 spin_unlock_irq(&device_state_lock
);
1056 return info
->nports
+ 1;
1065 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1069 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1070 if (udev
->children
[i
])
1071 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1073 if (udev
->state
== USB_STATE_SUSPENDED
)
1074 udev
->discon_suspended
= 1;
1075 udev
->state
= USB_STATE_NOTATTACHED
;
1079 * usb_set_device_state - change a device's current state (usbcore, hcds)
1080 * @udev: pointer to device whose state should be changed
1081 * @new_state: new state value to be stored
1083 * udev->state is _not_ fully protected by the device lock. Although
1084 * most transitions are made only while holding the lock, the state can
1085 * can change to USB_STATE_NOTATTACHED at almost any time. This
1086 * is so that devices can be marked as disconnected as soon as possible,
1087 * without having to wait for any semaphores to be released. As a result,
1088 * all changes to any device's state must be protected by the
1089 * device_state_lock spinlock.
1091 * Once a device has been added to the device tree, all changes to its state
1092 * should be made using this routine. The state should _not_ be set directly.
1094 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1095 * Otherwise udev->state is set to new_state, and if new_state is
1096 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1097 * to USB_STATE_NOTATTACHED.
1099 void usb_set_device_state(struct usb_device
*udev
,
1100 enum usb_device_state new_state
)
1102 unsigned long flags
;
1104 spin_lock_irqsave(&device_state_lock
, flags
);
1105 if (udev
->state
== USB_STATE_NOTATTACHED
)
1107 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1109 /* root hub wakeup capabilities are managed out-of-band
1110 * and may involve silicon errata ... ignore them here.
1113 if (udev
->state
== USB_STATE_SUSPENDED
1114 || new_state
== USB_STATE_SUSPENDED
)
1115 ; /* No change to wakeup settings */
1116 else if (new_state
== USB_STATE_CONFIGURED
)
1117 device_init_wakeup(&udev
->dev
,
1118 (udev
->actconfig
->desc
.bmAttributes
1119 & USB_CONFIG_ATT_WAKEUP
));
1121 device_init_wakeup(&udev
->dev
, 0);
1123 udev
->state
= new_state
;
1125 recursively_mark_NOTATTACHED(udev
);
1126 spin_unlock_irqrestore(&device_state_lock
, flags
);
1133 * usb_reset_suspended_device - reset a suspended device instead of resuming it
1134 * @udev: device to be reset instead of resumed
1136 * If a host controller doesn't maintain VBUS suspend current during a
1137 * system sleep or is reset when the system wakes up, all the USB
1138 * power sessions below it will be broken. This is especially troublesome
1139 * for mass-storage devices containing mounted filesystems, since the
1140 * device will appear to have disconnected and all the memory mappings
1141 * to it will be lost.
1143 * As an alternative, this routine attempts to recover power sessions for
1144 * devices that are still present by resetting them instead of resuming
1145 * them. If all goes well, the devices will appear to persist across the
1146 * the interruption of the power sessions.
1148 * This facility is inherently dangerous. Although usb_reset_device()
1149 * makes every effort to insure that the same device is present after the
1150 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
1151 * quite possible for a device to remain unaltered but its media to be
1152 * changed. If the user replaces a flash memory card while the system is
1153 * asleep, he will have only himself to blame when the filesystem on the
1154 * new card is corrupted and the system crashes.
1156 int usb_reset_suspended_device(struct usb_device
*udev
)
1160 dev_dbg(&udev
->dev
, "usb %sresume\n", "reset-");
1162 /* After we're done the device won't be suspended any more.
1163 * In addition, the reset won't work if udev->state is SUSPENDED.
1165 usb_set_device_state(udev
, udev
->actconfig
1166 ? USB_STATE_CONFIGURED
1167 : USB_STATE_ADDRESS
);
1169 /* Root hubs don't need to be (and can't be) reset */
1171 rc
= usb_reset_device(udev
);
1176 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1177 * @rhdev: struct usb_device for the root hub
1179 * The USB host controller driver calls this function when its root hub
1180 * is resumed and Vbus power has been interrupted or the controller
1181 * has been reset. The routine marks @rhdev as having lost power. When
1182 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
1183 * is enabled then it will carry out power-session recovery, otherwise
1184 * it will disconnect all the child devices.
1186 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
1188 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
1189 rhdev
->reset_resume
= 1;
1191 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
1193 #endif /* CONFIG_PM */
1195 static void choose_address(struct usb_device
*udev
)
1198 struct usb_bus
*bus
= udev
->bus
;
1200 /* If khubd ever becomes multithreaded, this will need a lock */
1202 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1203 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1206 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1208 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1211 set_bit(devnum
, bus
->devmap
.devicemap
);
1212 udev
->devnum
= devnum
;
1216 static void release_address(struct usb_device
*udev
)
1218 if (udev
->devnum
> 0) {
1219 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1224 #ifdef CONFIG_USB_SUSPEND
1226 static void usb_stop_pm(struct usb_device
*udev
)
1228 /* Synchronize with the ksuspend thread to prevent any more
1229 * autosuspend requests from being submitted, and decrement
1230 * the parent's count of unsuspended children.
1233 if (udev
->parent
&& !udev
->discon_suspended
)
1234 usb_autosuspend_device(udev
->parent
);
1235 usb_pm_unlock(udev
);
1237 /* Stop any autosuspend requests already submitted */
1238 cancel_rearming_delayed_work(&udev
->autosuspend
);
1243 static inline void usb_stop_pm(struct usb_device
*udev
)
1249 * usb_disconnect - disconnect a device (usbcore-internal)
1250 * @pdev: pointer to device being disconnected
1251 * Context: !in_interrupt ()
1253 * Something got disconnected. Get rid of it and all of its children.
1255 * If *pdev is a normal device then the parent hub must already be locked.
1256 * If *pdev is a root hub then this routine will acquire the
1257 * usb_bus_list_lock on behalf of the caller.
1259 * Only hub drivers (including virtual root hub drivers for host
1260 * controllers) should ever call this.
1262 * This call is synchronous, and may not be used in an interrupt context.
1264 void usb_disconnect(struct usb_device
**pdev
)
1266 struct usb_device
*udev
= *pdev
;
1270 pr_debug ("%s nodev\n", __FUNCTION__
);
1274 /* mark the device as inactive, so any further urb submissions for
1275 * this device (and any of its children) will fail immediately.
1276 * this quiesces everyting except pending urbs.
1278 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1279 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1281 usb_lock_device(udev
);
1283 /* Free up all the children before we remove this device */
1284 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1285 if (udev
->children
[i
])
1286 usb_disconnect(&udev
->children
[i
]);
1289 /* deallocate hcd/hardware state ... nuking all pending urbs and
1290 * cleaning up all state associated with the current configuration
1291 * so that the hardware is now fully quiesced.
1293 dev_dbg (&udev
->dev
, "unregistering device\n");
1294 usb_disable_device(udev
, 0);
1296 usb_unlock_device(udev
);
1298 /* Unregister the device. The device driver is responsible
1299 * for removing the device files from usbfs and sysfs and for
1300 * de-configuring the device.
1302 device_del(&udev
->dev
);
1304 /* Free the device number and delete the parent's children[]
1305 * (or root_hub) pointer.
1307 release_address(udev
);
1309 /* Avoid races with recursively_mark_NOTATTACHED() */
1310 spin_lock_irq(&device_state_lock
);
1312 spin_unlock_irq(&device_state_lock
);
1316 put_device(&udev
->dev
);
1320 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1324 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1328 static inline void show_string(struct usb_device
*udev
, char *id
, char *string
)
1333 #ifdef CONFIG_USB_OTG
1334 #include "otg_whitelist.h"
1335 static int __usb_port_suspend(struct usb_device
*, int port1
);
1339 * usb_new_device - perform initial device setup (usbcore-internal)
1340 * @udev: newly addressed device (in ADDRESS state)
1342 * This is called with devices which have been enumerated, but not yet
1343 * configured. The device descriptor is available, but not descriptors
1344 * for any device configuration. The caller must have locked either
1345 * the parent hub (if udev is a normal device) or else the
1346 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1347 * udev has already been installed, but udev is not yet visible through
1348 * sysfs or other filesystem code.
1350 * It will return if the device is configured properly or not. Zero if
1351 * the interface was registered with the driver core; else a negative
1354 * This call is synchronous, and may not be used in an interrupt context.
1356 * Only the hub driver or root-hub registrar should ever call this.
1358 int usb_new_device(struct usb_device
*udev
)
1362 /* Determine quirks */
1363 usb_detect_quirks(udev
);
1365 err
= usb_get_configuration(udev
);
1367 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1372 /* read the standard strings and cache them if present */
1373 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1374 udev
->manufacturer
= usb_cache_string(udev
,
1375 udev
->descriptor
.iManufacturer
);
1376 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1378 /* Tell the world! */
1379 dev_dbg(&udev
->dev
, "new device strings: Mfr=%d, Product=%d, "
1380 "SerialNumber=%d\n",
1381 udev
->descriptor
.iManufacturer
,
1382 udev
->descriptor
.iProduct
,
1383 udev
->descriptor
.iSerialNumber
);
1384 show_string(udev
, "Product", udev
->product
);
1385 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1386 show_string(udev
, "SerialNumber", udev
->serial
);
1388 #ifdef CONFIG_USB_OTG
1390 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1391 * to wake us after we've powered off VBUS; and HNP, switching roles
1392 * "host" to "peripheral". The OTG descriptor helps figure this out.
1394 if (!udev
->bus
->is_b_host
1396 && udev
->parent
== udev
->bus
->root_hub
) {
1397 struct usb_otg_descriptor
*desc
= 0;
1398 struct usb_bus
*bus
= udev
->bus
;
1400 /* descriptor may appear anywhere in config */
1401 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1402 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1403 USB_DT_OTG
, (void **) &desc
) == 0) {
1404 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1405 unsigned port1
= udev
->portnum
;
1407 dev_info(&udev
->dev
,
1408 "Dual-Role OTG device on %sHNP port\n",
1409 (port1
== bus
->otg_port
)
1412 /* enable HNP before suspend, it's simpler */
1413 if (port1
== bus
->otg_port
)
1414 bus
->b_hnp_enable
= 1;
1415 err
= usb_control_msg(udev
,
1416 usb_sndctrlpipe(udev
, 0),
1417 USB_REQ_SET_FEATURE
, 0,
1419 ? USB_DEVICE_B_HNP_ENABLE
1420 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1421 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1423 /* OTG MESSAGE: report errors here,
1424 * customize to match your product.
1426 dev_info(&udev
->dev
,
1427 "can't set HNP mode; %d\n",
1429 bus
->b_hnp_enable
= 0;
1435 if (!is_targeted(udev
)) {
1437 /* Maybe it can talk to us, though we can't talk to it.
1438 * (Includes HNP test device.)
1440 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1441 err
= __usb_port_suspend(udev
, udev
->bus
->otg_port
);
1443 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1450 /* export the usbdev device-node for libusb */
1451 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1452 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1454 /* Register the device. The device driver is responsible
1455 * for adding the device files to sysfs and for configuring
1458 err
= device_add(&udev
->dev
);
1460 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1464 /* Increment the parent's count of unsuspended children */
1466 usb_autoresume_device(udev
->parent
);
1472 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1476 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1477 u16
*status
, u16
*change
)
1481 mutex_lock(&hub
->status_mutex
);
1482 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1484 dev_err (hub
->intfdev
,
1485 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1489 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1490 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1493 mutex_unlock(&hub
->status_mutex
);
1498 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1499 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1501 struct usb_hcd
*hcd
;
1502 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1504 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1505 return hcd
->wireless
;
1509 #define PORT_RESET_TRIES 5
1510 #define SET_ADDRESS_TRIES 2
1511 #define GET_DESCRIPTOR_TRIES 2
1512 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1513 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1515 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1516 #define HUB_SHORT_RESET_TIME 10
1517 #define HUB_LONG_RESET_TIME 200
1518 #define HUB_RESET_TIMEOUT 500
1520 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1521 struct usb_device
*udev
, unsigned int delay
)
1523 int delay_time
, ret
;
1527 for (delay_time
= 0;
1528 delay_time
< HUB_RESET_TIMEOUT
;
1529 delay_time
+= delay
) {
1530 /* wait to give the device a chance to reset */
1533 /* read and decode port status */
1534 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1538 /* Device went away? */
1539 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1542 /* bomb out completely if something weird happened */
1543 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1546 /* if we`ve finished resetting, then break out of the loop */
1547 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1548 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1549 if (hub_is_wusb(hub
))
1550 udev
->speed
= USB_SPEED_VARIABLE
;
1551 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1552 udev
->speed
= USB_SPEED_HIGH
;
1553 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1554 udev
->speed
= USB_SPEED_LOW
;
1556 udev
->speed
= USB_SPEED_FULL
;
1560 /* switch to the long delay after two short delay failures */
1561 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1562 delay
= HUB_LONG_RESET_TIME
;
1564 dev_dbg (hub
->intfdev
,
1565 "port %d not reset yet, waiting %dms\n",
1572 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1573 struct usb_device
*udev
, unsigned int delay
)
1577 /* Reset the port */
1578 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1579 status
= set_port_feature(hub
->hdev
,
1580 port1
, USB_PORT_FEAT_RESET
);
1582 dev_err(hub
->intfdev
,
1583 "cannot reset port %d (err = %d)\n",
1586 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1587 if (status
&& status
!= -ENOTCONN
)
1588 dev_dbg(hub
->intfdev
,
1589 "port_wait_reset: err = %d\n",
1593 /* return on disconnect or reset */
1596 /* TRSTRCY = 10 ms; plus some extra */
1601 clear_port_feature(hub
->hdev
,
1602 port1
, USB_PORT_FEAT_C_RESET
);
1603 /* FIXME need disconnect() for NOTATTACHED device */
1604 usb_set_device_state(udev
, status
1605 ? USB_STATE_NOTATTACHED
1606 : USB_STATE_DEFAULT
);
1610 dev_dbg (hub
->intfdev
,
1611 "port %d not enabled, trying reset again...\n",
1613 delay
= HUB_LONG_RESET_TIME
;
1616 dev_err (hub
->intfdev
,
1617 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1625 #ifdef CONFIG_USB_SUSPEND
1628 * Selective port suspend reduces power; most suspended devices draw
1629 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1630 * All devices below the suspended port are also suspended.
1632 * Devices leave suspend state when the host wakes them up. Some devices
1633 * also support "remote wakeup", where the device can activate the USB
1634 * tree above them to deliver data, such as a keypress or packet. In
1635 * some cases, this wakes the USB host.
1637 static int hub_port_suspend(struct usb_hub
*hub
, int port1
,
1638 struct usb_device
*udev
)
1642 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1644 /* enable remote wakeup when appropriate; this lets the device
1645 * wake up the upstream hub (including maybe the root hub).
1647 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1648 * we don't explicitly enable it here.
1650 if (udev
->do_remote_wakeup
) {
1651 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1652 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1653 USB_DEVICE_REMOTE_WAKEUP
, 0,
1655 USB_CTRL_SET_TIMEOUT
);
1658 "won't remote wakeup, status %d\n",
1663 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1665 dev_dbg(hub
->intfdev
,
1666 "can't suspend port %d, status %d\n",
1668 /* paranoia: "should not happen" */
1669 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1670 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1671 USB_DEVICE_REMOTE_WAKEUP
, 0,
1673 USB_CTRL_SET_TIMEOUT
);
1675 /* device has up to 10 msec to fully suspend */
1676 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1677 udev
->auto_pm
? "auto-" : "");
1678 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1685 * Devices on USB hub ports have only one "suspend" state, corresponding
1686 * to ACPI D2, "may cause the device to lose some context".
1687 * State transitions include:
1689 * - suspend, resume ... when the VBUS power link stays live
1690 * - suspend, disconnect ... VBUS lost
1692 * Once VBUS drop breaks the circuit, the port it's using has to go through
1693 * normal re-enumeration procedures, starting with enabling VBUS power.
1694 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1695 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1696 * timer, no SRP, no requests through sysfs.
1698 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1699 * the root hub for their bus goes into global suspend ... so we don't
1700 * (falsely) update the device power state to say it suspended.
1702 static int __usb_port_suspend (struct usb_device
*udev
, int port1
)
1706 /* caller owns the udev device lock */
1710 /* we change the device's upstream USB link,
1711 * but root hubs have no upstream USB link.
1714 status
= hub_port_suspend(hdev_to_hub(udev
->parent
), port1
,
1717 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1718 udev
->auto_pm
? "auto-" : "");
1719 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1725 * usb_port_suspend - suspend a usb device's upstream port
1726 * @udev: device that's no longer in active use
1727 * Context: must be able to sleep; device not locked; pm locks held
1729 * Suspends a USB device that isn't in active use, conserving power.
1730 * Devices may wake out of a suspend, if anything important happens,
1731 * using the remote wakeup mechanism. They may also be taken out of
1732 * suspend by the host, using usb_port_resume(). It's also routine
1733 * to disconnect devices while they are suspended.
1735 * This only affects the USB hardware for a device; its interfaces
1736 * (and, for hubs, child devices) must already have been suspended.
1738 * Suspending OTG devices may trigger HNP, if that's been enabled
1739 * between a pair of dual-role devices. That will change roles, such
1740 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1742 * Returns 0 on success, else negative errno.
1744 int usb_port_suspend(struct usb_device
*udev
)
1746 return __usb_port_suspend(udev
, udev
->portnum
);
1750 * If the USB "suspend" state is in use (rather than "global suspend"),
1751 * many devices will be individually taken out of suspend state using
1752 * special" resume" signaling. These routines kick in shortly after
1753 * hardware resume signaling is finished, either because of selective
1754 * resume (by host) or remote wakeup (by device) ... now see what changed
1755 * in the tree that's rooted at this device.
1757 static int finish_port_resume(struct usb_device
*udev
)
1762 /* caller owns the udev device lock */
1763 dev_dbg(&udev
->dev
, "finish resume\n");
1765 /* usb ch9 identifies four variants of SUSPENDED, based on what
1766 * state the device resumes to. Linux currently won't see the
1767 * first two on the host side; they'd be inside hub_port_init()
1768 * during many timeouts, but khubd can't suspend until later.
1770 usb_set_device_state(udev
, udev
->actconfig
1771 ? USB_STATE_CONFIGURED
1772 : USB_STATE_ADDRESS
);
1774 /* 10.5.4.5 says be sure devices in the tree are still there.
1775 * For now let's assume the device didn't go crazy on resume,
1776 * and device drivers will know about any resume quirks.
1778 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1780 status
= (status
== 2 ? 0 : -ENODEV
);
1784 "gone after usb resume? status %d\n",
1786 else if (udev
->actconfig
) {
1787 le16_to_cpus(&devstatus
);
1788 if ((devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
1790 status
= usb_control_msg(udev
,
1791 usb_sndctrlpipe(udev
, 0),
1792 USB_REQ_CLEAR_FEATURE
,
1794 USB_DEVICE_REMOTE_WAKEUP
, 0,
1796 USB_CTRL_SET_TIMEOUT
);
1798 dev_dbg(&udev
->dev
, "disable remote "
1799 "wakeup, status %d\n", status
);
1803 } else if (udev
->devnum
<= 0) {
1804 dev_dbg(&udev
->dev
, "bogus resume!\n");
1811 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1814 u16 portchange
, portstatus
;
1816 /* Skip the initial Clear-Suspend step for a remote wakeup */
1817 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1818 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
1819 goto SuspendCleared
;
1821 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1823 set_bit(port1
, hub
->busy_bits
);
1825 /* see 7.1.7.7; affects power usage, but not budgeting */
1826 status
= clear_port_feature(hub
->hdev
,
1827 port1
, USB_PORT_FEAT_SUSPEND
);
1829 dev_dbg(hub
->intfdev
,
1830 "can't resume port %d, status %d\n",
1833 /* drive resume for at least 20 msec */
1835 dev_dbg(&udev
->dev
, "usb %sresume\n",
1836 udev
->auto_pm
? "auto-" : "");
1839 #define LIVE_FLAGS ( USB_PORT_STAT_POWER \
1840 | USB_PORT_STAT_ENABLE \
1841 | USB_PORT_STAT_CONNECTION)
1843 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1844 * stop resume signaling. Then finish the resume
1847 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1850 || (portstatus
& LIVE_FLAGS
) != LIVE_FLAGS
1851 || (portstatus
& USB_PORT_STAT_SUSPEND
) != 0
1853 dev_dbg(hub
->intfdev
,
1854 "port %d status %04x.%04x after resume, %d\n",
1855 port1
, portchange
, portstatus
, status
);
1859 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1860 clear_port_feature(hub
->hdev
, port1
,
1861 USB_PORT_FEAT_C_SUSPEND
);
1862 /* TRSMRCY = 10 msec */
1865 status
= finish_port_resume(udev
);
1869 hub_port_logical_disconnect(hub
, port1
);
1871 clear_bit(port1
, hub
->busy_bits
);
1872 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
1873 usb_enable_root_hub_irq(hub
->hdev
->bus
);
1879 * usb_port_resume - re-activate a suspended usb device's upstream port
1880 * @udev: device to re-activate
1881 * Context: must be able to sleep; device not locked; pm locks held
1883 * This will re-activate the suspended device, increasing power usage
1884 * while letting drivers communicate again with its endpoints.
1885 * USB resume explicitly guarantees that the power session between
1886 * the host and the device is the same as it was when the device
1889 * Returns 0 on success, else negative errno.
1891 int usb_port_resume(struct usb_device
*udev
)
1895 /* we change the device's upstream USB link,
1896 * but root hubs have no upstream USB link.
1899 // NOTE this fails if parent is also suspended...
1900 status
= hub_port_resume(hdev_to_hub(udev
->parent
),
1901 udev
->portnum
, udev
);
1903 dev_dbg(&udev
->dev
, "usb %sresume\n",
1904 udev
->auto_pm
? "auto-" : "");
1905 status
= finish_port_resume(udev
);
1908 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
1912 static int remote_wakeup(struct usb_device
*udev
)
1916 usb_lock_device(udev
);
1917 if (udev
->state
== USB_STATE_SUSPENDED
) {
1918 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
1919 usb_mark_last_busy(udev
);
1920 status
= usb_external_resume_device(udev
);
1922 usb_unlock_device(udev
);
1926 #else /* CONFIG_USB_SUSPEND */
1928 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1930 int usb_port_suspend(struct usb_device
*udev
)
1936 finish_port_resume(struct usb_device
*udev
)
1942 hub_port_resume(struct usb_hub
*hub
, int port1
, struct usb_device
*udev
)
1947 int usb_port_resume(struct usb_device
*udev
)
1952 static inline int remote_wakeup(struct usb_device
*udev
)
1959 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1961 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1962 struct usb_device
*hdev
= hub
->hdev
;
1965 /* fail if children aren't already suspended */
1966 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1967 struct usb_device
*udev
;
1969 udev
= hdev
->children
[port1
-1];
1970 if (udev
&& msg
.event
== PM_EVENT_SUSPEND
&&
1971 #ifdef CONFIG_USB_SUSPEND
1972 udev
->state
!= USB_STATE_SUSPENDED
1974 udev
->dev
.power
.power_state
.event
1979 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
1985 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1987 /* stop khubd and related activity */
1992 static int hub_resume(struct usb_interface
*intf
)
1994 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1996 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1998 /* tell khubd to look for changes on this hub */
2003 #else /* CONFIG_PM */
2005 static inline int remote_wakeup(struct usb_device
*udev
)
2010 #define hub_suspend NULL
2011 #define hub_resume NULL
2015 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2017 * Between connect detection and reset signaling there must be a delay
2018 * of 100ms at least for debounce and power-settling. The corresponding
2019 * timer shall restart whenever the downstream port detects a disconnect.
2021 * Apparently there are some bluetooth and irda-dongles and a number of
2022 * low-speed devices for which this debounce period may last over a second.
2023 * Not covered by the spec - but easy to deal with.
2025 * This implementation uses a 1500ms total debounce timeout; if the
2026 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2027 * every 25ms for transient disconnects. When the port status has been
2028 * unchanged for 100ms it returns the port status.
2031 #define HUB_DEBOUNCE_TIMEOUT 1500
2032 #define HUB_DEBOUNCE_STEP 25
2033 #define HUB_DEBOUNCE_STABLE 100
2035 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2038 int total_time
, stable_time
= 0;
2039 u16 portchange
, portstatus
;
2040 unsigned connection
= 0xffff;
2042 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2043 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2047 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2048 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2049 stable_time
+= HUB_DEBOUNCE_STEP
;
2050 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2054 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2057 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2058 clear_port_feature(hub
->hdev
, port1
,
2059 USB_PORT_FEAT_C_CONNECTION
);
2062 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2064 msleep(HUB_DEBOUNCE_STEP
);
2067 dev_dbg (hub
->intfdev
,
2068 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2069 port1
, total_time
, stable_time
, portstatus
);
2071 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2076 static void ep0_reinit(struct usb_device
*udev
)
2078 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2079 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2080 udev
->ep_in
[0] = udev
->ep_out
[0] = &udev
->ep0
;
2083 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2084 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2086 static int hub_set_address(struct usb_device
*udev
)
2090 if (udev
->devnum
== 0)
2092 if (udev
->state
== USB_STATE_ADDRESS
)
2094 if (udev
->state
!= USB_STATE_DEFAULT
)
2096 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2097 USB_REQ_SET_ADDRESS
, 0, udev
->devnum
, 0,
2098 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2100 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2106 /* Reset device, (re)assign address, get device descriptor.
2107 * Device connection must be stable, no more debouncing needed.
2108 * Returns device in USB_STATE_ADDRESS, except on error.
2110 * If this is called for an already-existing device (as part of
2111 * usb_reset_device), the caller must own the device lock. For a
2112 * newly detected device that is not accessible through any global
2113 * pointers, it's not necessary to lock the device.
2116 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2119 static DEFINE_MUTEX(usb_address0_mutex
);
2121 struct usb_device
*hdev
= hub
->hdev
;
2123 unsigned delay
= HUB_SHORT_RESET_TIME
;
2124 enum usb_device_speed oldspeed
= udev
->speed
;
2127 /* root hub ports have a slightly longer reset period
2128 * (from USB 2.0 spec, section 7.1.7.5)
2130 if (!hdev
->parent
) {
2131 delay
= HUB_ROOT_RESET_TIME
;
2132 if (port1
== hdev
->bus
->otg_port
)
2133 hdev
->bus
->b_hnp_enable
= 0;
2136 /* Some low speed devices have problems with the quick delay, so */
2137 /* be a bit pessimistic with those devices. RHbug #23670 */
2138 if (oldspeed
== USB_SPEED_LOW
)
2139 delay
= HUB_LONG_RESET_TIME
;
2141 mutex_lock(&usb_address0_mutex
);
2143 /* Reset the device; full speed may morph to high speed */
2144 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2145 if (retval
< 0) /* error or disconnect */
2147 /* success, speed is known */
2150 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2151 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2154 oldspeed
= udev
->speed
;
2156 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2157 * it's fixed size except for full speed devices.
2158 * For Wireless USB devices, ep0 max packet is always 512 (tho
2159 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2161 switch (udev
->speed
) {
2162 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2163 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2165 case USB_SPEED_HIGH
: /* fixed at 64 */
2166 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2168 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2169 /* to determine the ep0 maxpacket size, try to read
2170 * the device descriptor to get bMaxPacketSize0 and
2171 * then correct our initial guess.
2173 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2175 case USB_SPEED_LOW
: /* fixed at 8 */
2176 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2183 switch (udev
->speed
) {
2184 case USB_SPEED_LOW
: speed
= "low"; break;
2185 case USB_SPEED_FULL
: speed
= "full"; break;
2186 case USB_SPEED_HIGH
: speed
= "high"; break;
2187 case USB_SPEED_VARIABLE
:
2191 default: speed
= "?"; break;
2193 dev_info (&udev
->dev
,
2194 "%s %s speed %sUSB device using %s and address %d\n",
2195 (udev
->config
) ? "reset" : "new", speed
, type
,
2196 udev
->bus
->controller
->driver
->name
, udev
->devnum
);
2198 /* Set up TT records, if needed */
2200 udev
->tt
= hdev
->tt
;
2201 udev
->ttport
= hdev
->ttport
;
2202 } else if (udev
->speed
!= USB_SPEED_HIGH
2203 && hdev
->speed
== USB_SPEED_HIGH
) {
2204 udev
->tt
= &hub
->tt
;
2205 udev
->ttport
= port1
;
2208 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2209 * Because device hardware and firmware is sometimes buggy in
2210 * this area, and this is how Linux has done it for ages.
2211 * Change it cautiously.
2213 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2214 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2215 * so it may help with some non-standards-compliant devices.
2216 * Otherwise we start with SET_ADDRESS and then try to read the
2217 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2220 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2221 if (USE_NEW_SCHEME(retry_counter
)) {
2222 struct usb_device_descriptor
*buf
;
2225 #define GET_DESCRIPTOR_BUFSIZE 64
2226 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2232 /* Retry on all errors; some devices are flakey.
2233 * 255 is for WUSB devices, we actually need to use
2234 * 512 (WUSB1.0[4.8.1]).
2236 for (j
= 0; j
< 3; ++j
) {
2237 buf
->bMaxPacketSize0
= 0;
2238 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2239 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2240 USB_DT_DEVICE
<< 8, 0,
2241 buf
, GET_DESCRIPTOR_BUFSIZE
,
2242 USB_CTRL_GET_TIMEOUT
);
2243 switch (buf
->bMaxPacketSize0
) {
2244 case 8: case 16: case 32: case 64: case 255:
2245 if (buf
->bDescriptorType
==
2259 udev
->descriptor
.bMaxPacketSize0
=
2260 buf
->bMaxPacketSize0
;
2263 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2264 if (retval
< 0) /* error or disconnect */
2266 if (oldspeed
!= udev
->speed
) {
2268 "device reset changed speed!\n");
2273 dev_err(&udev
->dev
, "device descriptor "
2274 "read/%s, error %d\n",
2279 #undef GET_DESCRIPTOR_BUFSIZE
2282 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2283 retval
= hub_set_address(udev
);
2290 "device not accepting address %d, error %d\n",
2291 udev
->devnum
, retval
);
2295 /* cope with hardware quirkiness:
2296 * - let SET_ADDRESS settle, some device hardware wants it
2297 * - read ep0 maxpacket even for high and low speed,
2300 if (USE_NEW_SCHEME(retry_counter
))
2303 retval
= usb_get_device_descriptor(udev
, 8);
2305 dev_err(&udev
->dev
, "device descriptor "
2306 "read/%s, error %d\n",
2318 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2319 512 : udev
->descriptor
.bMaxPacketSize0
;
2320 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2321 if (udev
->speed
!= USB_SPEED_FULL
||
2322 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2323 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2327 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2328 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2332 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2333 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2334 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2345 hub_port_disable(hub
, port1
, 0);
2346 mutex_unlock(&usb_address0_mutex
);
2351 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2353 struct usb_qualifier_descriptor
*qual
;
2356 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2360 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2361 qual
, sizeof *qual
);
2362 if (status
== sizeof *qual
) {
2363 dev_info(&udev
->dev
, "not running at top speed; "
2364 "connect to a high speed hub\n");
2365 /* hub LEDs are probably harder to miss than syslog */
2366 if (hub
->has_indicators
) {
2367 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2368 schedule_delayed_work (&hub
->leds
, 0);
2375 hub_power_remaining (struct usb_hub
*hub
)
2377 struct usb_device
*hdev
= hub
->hdev
;
2381 if (!hub
->limited_power
)
2384 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2385 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2386 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2392 /* Unconfigured devices may not use more than 100mA,
2393 * or 8mA for OTG ports */
2394 if (udev
->actconfig
)
2395 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2396 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2400 if (delta
> hub
->mA_per_port
)
2401 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2403 delta
, hub
->mA_per_port
, port1
);
2406 if (remaining
< 0) {
2407 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2414 /* Handle physical or logical connection change events.
2415 * This routine is called when:
2416 * a port connection-change occurs;
2417 * a port enable-change occurs (often caused by EMI);
2418 * usb_reset_device() encounters changed descriptors (as from
2419 * a firmware download)
2420 * caller already locked the hub
2422 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2423 u16 portstatus
, u16 portchange
)
2425 struct usb_device
*hdev
= hub
->hdev
;
2426 struct device
*hub_dev
= hub
->intfdev
;
2427 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2431 "port %d, status %04x, change %04x, %s\n",
2432 port1
, portstatus
, portchange
, portspeed (portstatus
));
2434 if (hub
->has_indicators
) {
2435 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2436 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2439 /* Disconnect any existing devices under this port */
2440 if (hdev
->children
[port1
-1])
2441 usb_disconnect(&hdev
->children
[port1
-1]);
2442 clear_bit(port1
, hub
->change_bits
);
2444 #ifdef CONFIG_USB_OTG
2445 /* during HNP, don't repeat the debounce */
2446 if (hdev
->bus
->is_b_host
)
2447 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2450 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2451 status
= hub_port_debounce(hub
, port1
);
2453 if (printk_ratelimit())
2454 dev_err (hub_dev
, "connect-debounce failed, "
2455 "port %d disabled\n", port1
);
2458 portstatus
= status
;
2461 /* Return now if nothing is connected */
2462 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2464 /* maybe switch power back on (e.g. root hub was reset) */
2465 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2466 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2467 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2469 if (portstatus
& USB_PORT_STAT_ENABLE
)
2474 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2475 struct usb_device
*udev
;
2477 /* reallocate for each attempt, since references
2478 * to the previous one can escape in various ways
2480 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2483 "couldn't allocate port %d usb_device\n",
2488 usb_set_device_state(udev
, USB_STATE_POWERED
);
2489 udev
->speed
= USB_SPEED_UNKNOWN
;
2490 udev
->bus_mA
= hub
->mA_per_port
;
2491 udev
->level
= hdev
->level
+ 1;
2493 /* set the address */
2494 choose_address(udev
);
2495 if (udev
->devnum
<= 0) {
2496 status
= -ENOTCONN
; /* Don't retry */
2500 /* reset and get descriptor */
2501 status
= hub_port_init(hub
, udev
, port1
, i
);
2505 /* consecutive bus-powered hubs aren't reliable; they can
2506 * violate the voltage drop budget. if the new child has
2507 * a "powered" LED, users should notice we didn't enable it
2508 * (without reading syslog), even without per-port LEDs
2511 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2512 && udev
->bus_mA
<= 100) {
2515 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2518 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2521 le16_to_cpus(&devstat
);
2522 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2524 "can't connect bus-powered hub "
2526 if (hub
->has_indicators
) {
2527 hub
->indicator
[port1
-1] =
2528 INDICATOR_AMBER_BLINK
;
2529 schedule_delayed_work (&hub
->leds
, 0);
2531 status
= -ENOTCONN
; /* Don't retry */
2536 /* check for devices running slower than they could */
2537 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2538 && udev
->speed
== USB_SPEED_FULL
2539 && highspeed_hubs
!= 0)
2540 check_highspeed (hub
, udev
, port1
);
2542 /* Store the parent's children[] pointer. At this point
2543 * udev becomes globally accessible, although presumably
2544 * no one will look at it until hdev is unlocked.
2548 /* We mustn't add new devices if the parent hub has
2549 * been disconnected; we would race with the
2550 * recursively_mark_NOTATTACHED() routine.
2552 spin_lock_irq(&device_state_lock
);
2553 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2556 hdev
->children
[port1
-1] = udev
;
2557 spin_unlock_irq(&device_state_lock
);
2559 /* Run it through the hoops (find a driver, etc) */
2561 status
= usb_new_device(udev
);
2563 spin_lock_irq(&device_state_lock
);
2564 hdev
->children
[port1
-1] = NULL
;
2565 spin_unlock_irq(&device_state_lock
);
2572 status
= hub_power_remaining(hub
);
2574 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2579 hub_port_disable(hub
, port1
, 1);
2582 release_address(udev
);
2584 if (status
== -ENOTCONN
)
2589 hub_port_disable(hub
, port1
, 1);
2592 static void hub_events(void)
2594 struct list_head
*tmp
;
2595 struct usb_device
*hdev
;
2596 struct usb_interface
*intf
;
2597 struct usb_hub
*hub
;
2598 struct device
*hub_dev
;
2607 * We restart the list every time to avoid a deadlock with
2608 * deleting hubs downstream from this one. This should be
2609 * safe since we delete the hub from the event list.
2610 * Not the most efficient, but avoids deadlocks.
2614 /* Grab the first entry at the beginning of the list */
2615 spin_lock_irq(&hub_event_lock
);
2616 if (list_empty(&hub_event_list
)) {
2617 spin_unlock_irq(&hub_event_lock
);
2621 tmp
= hub_event_list
.next
;
2624 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2625 kref_get(&hub
->kref
);
2626 spin_unlock_irq(&hub_event_lock
);
2629 hub_dev
= hub
->intfdev
;
2630 intf
= to_usb_interface(hub_dev
);
2631 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2632 hdev
->state
, hub
->descriptor
2633 ? hub
->descriptor
->bNbrPorts
2635 /* NOTE: expects max 15 ports... */
2636 (u16
) hub
->change_bits
[0],
2637 (u16
) hub
->event_bits
[0]);
2639 /* Lock the device, then check to see if we were
2640 * disconnected while waiting for the lock to succeed. */
2641 usb_lock_device(hdev
);
2642 if (unlikely(hub
->disconnected
))
2645 /* If the hub has died, clean up after it */
2646 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2647 hub
->error
= -ENODEV
;
2648 hub_pre_reset(intf
);
2653 ret
= usb_autopm_get_interface(intf
);
2655 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2659 /* If this is an inactive hub, do nothing */
2664 dev_dbg (hub_dev
, "resetting for error %d\n",
2667 ret
= usb_reset_composite_device(hdev
, intf
);
2670 "error resetting hub: %d\n", ret
);
2678 /* deal with port status changes */
2679 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2680 if (test_bit(i
, hub
->busy_bits
))
2682 connect_change
= test_bit(i
, hub
->change_bits
);
2683 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2684 !connect_change
&& !hub
->activating
)
2687 ret
= hub_port_status(hub
, i
,
2688 &portstatus
, &portchange
);
2692 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2694 USB_PORT_STAT_CONNECTION
))
2697 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2698 clear_port_feature(hdev
, i
,
2699 USB_PORT_FEAT_C_CONNECTION
);
2703 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2704 if (!connect_change
)
2706 "port %d enable change, "
2709 clear_port_feature(hdev
, i
,
2710 USB_PORT_FEAT_C_ENABLE
);
2713 * EM interference sometimes causes badly
2714 * shielded USB devices to be shutdown by
2715 * the hub, this hack enables them again.
2716 * Works at least with mouse driver.
2718 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2720 && hdev
->children
[i
-1]) {
2723 "disabled by hub (EMI?), "
2730 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2731 clear_port_feature(hdev
, i
,
2732 USB_PORT_FEAT_C_SUSPEND
);
2733 if (hdev
->children
[i
-1]) {
2734 ret
= remote_wakeup(hdev
->
2740 hub_port_disable(hub
, i
, 1);
2743 "resume on port %d, status %d\n",
2747 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2749 "over-current change on port %d\n",
2751 clear_port_feature(hdev
, i
,
2752 USB_PORT_FEAT_C_OVER_CURRENT
);
2756 if (portchange
& USB_PORT_STAT_C_RESET
) {
2758 "reset change on port %d\n",
2760 clear_port_feature(hdev
, i
,
2761 USB_PORT_FEAT_C_RESET
);
2765 hub_port_connect_change(hub
, i
,
2766 portstatus
, portchange
);
2769 /* deal with hub status changes */
2770 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2772 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2773 dev_err (hub_dev
, "get_hub_status failed\n");
2775 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2776 dev_dbg (hub_dev
, "power change\n");
2777 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2778 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2779 /* FIXME: Is this always true? */
2780 hub
->limited_power
= 0;
2782 hub
->limited_power
= 1;
2784 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2785 dev_dbg (hub_dev
, "overcurrent change\n");
2786 msleep(500); /* Cool down */
2787 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2792 hub
->activating
= 0;
2794 /* If this is a root hub, tell the HCD it's okay to
2795 * re-enable port-change interrupts now. */
2796 if (!hdev
->parent
&& !hub
->busy_bits
[0])
2797 usb_enable_root_hub_irq(hdev
->bus
);
2800 /* Allow autosuspend if we're not going to run again */
2801 if (list_empty(&hub
->event_list
))
2802 usb_autopm_enable(intf
);
2804 usb_unlock_device(hdev
);
2805 kref_put(&hub
->kref
, hub_release
);
2807 } /* end while (1) */
2810 static int hub_thread(void *__unused
)
2814 wait_event_interruptible(khubd_wait
,
2815 !list_empty(&hub_event_list
) ||
2816 kthread_should_stop());
2818 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2820 pr_debug("%s: khubd exiting\n", usbcore_name
);
2824 static struct usb_device_id hub_id_table
[] = {
2825 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2826 .bDeviceClass
= USB_CLASS_HUB
},
2827 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2828 .bInterfaceClass
= USB_CLASS_HUB
},
2829 { } /* Terminating entry */
2832 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2834 static struct usb_driver hub_driver
= {
2837 .disconnect
= hub_disconnect
,
2838 .suspend
= hub_suspend
,
2839 .resume
= hub_resume
,
2840 .pre_reset
= hub_pre_reset
,
2841 .post_reset
= hub_post_reset
,
2843 .id_table
= hub_id_table
,
2844 .supports_autosuspend
= 1,
2847 int usb_hub_init(void)
2849 if (usb_register(&hub_driver
) < 0) {
2850 printk(KERN_ERR
"%s: can't register hub driver\n",
2855 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2856 if (!IS_ERR(khubd_task
))
2859 /* Fall through if kernel_thread failed */
2860 usb_deregister(&hub_driver
);
2861 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2866 void usb_hub_cleanup(void)
2868 kthread_stop(khubd_task
);
2871 * Hub resources are freed for us by usb_deregister. It calls
2872 * usb_driver_purge on every device which in turn calls that
2873 * devices disconnect function if it is using this driver.
2874 * The hub_disconnect function takes care of releasing the
2875 * individual hub resources. -greg
2877 usb_deregister(&hub_driver
);
2878 } /* usb_hub_cleanup() */
2880 static int config_descriptors_changed(struct usb_device
*udev
)
2884 struct usb_config_descriptor
*buf
;
2886 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2887 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2888 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2890 buf
= kmalloc (len
, GFP_KERNEL
);
2892 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2893 /* assume the worst */
2896 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2898 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2900 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
2902 if (length
< old_length
) {
2903 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
2907 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
2909 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
2910 index
, buf
->bConfigurationValue
);
2915 return index
!= udev
->descriptor
.bNumConfigurations
;
2919 * usb_reset_device - perform a USB port reset to reinitialize a device
2920 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2922 * WARNING - don't use this routine to reset a composite device
2923 * (one with multiple interfaces owned by separate drivers)!
2924 * Use usb_reset_composite_device() instead.
2926 * Do a port reset, reassign the device's address, and establish its
2927 * former operating configuration. If the reset fails, or the device's
2928 * descriptors change from their values before the reset, or the original
2929 * configuration and altsettings cannot be restored, a flag will be set
2930 * telling khubd to pretend the device has been disconnected and then
2931 * re-connected. All drivers will be unbound, and the device will be
2932 * re-enumerated and probed all over again.
2934 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2935 * flagged for logical disconnection, or some other negative error code
2936 * if the reset wasn't even attempted.
2938 * The caller must own the device lock. For example, it's safe to use
2939 * this from a driver probe() routine after downloading new firmware.
2940 * For calls that might not occur during probe(), drivers should lock
2941 * the device using usb_lock_device_for_reset().
2943 int usb_reset_device(struct usb_device
*udev
)
2945 struct usb_device
*parent_hdev
= udev
->parent
;
2946 struct usb_hub
*parent_hub
;
2947 struct usb_device_descriptor descriptor
= udev
->descriptor
;
2949 int port1
= udev
->portnum
;
2951 if (udev
->state
== USB_STATE_NOTATTACHED
||
2952 udev
->state
== USB_STATE_SUSPENDED
) {
2953 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
2959 /* this requires hcd-specific logic; see OHCI hc_restart() */
2960 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
2963 parent_hub
= hdev_to_hub(parent_hdev
);
2965 set_bit(port1
, parent_hub
->busy_bits
);
2966 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
2968 /* ep0 maxpacket size may change; let the HCD know about it.
2969 * Other endpoints will be handled by re-enumeration. */
2971 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
2975 clear_bit(port1
, parent_hub
->busy_bits
);
2976 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
2977 usb_enable_root_hub_irq(parent_hdev
->bus
);
2982 /* Device might have changed firmware (DFU or similar) */
2983 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
2984 || config_descriptors_changed (udev
)) {
2985 dev_info(&udev
->dev
, "device firmware changed\n");
2986 udev
->descriptor
= descriptor
; /* for disconnect() calls */
2990 if (!udev
->actconfig
)
2993 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2994 USB_REQ_SET_CONFIGURATION
, 0,
2995 udev
->actconfig
->desc
.bConfigurationValue
, 0,
2996 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2999 "can't restore configuration #%d (error=%d)\n",
3000 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3003 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3005 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3006 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3007 struct usb_interface_descriptor
*desc
;
3009 /* set_interface resets host side toggle even
3010 * for altsetting zero. the interface may have no driver.
3012 desc
= &intf
->cur_altsetting
->desc
;
3013 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3014 desc
->bAlternateSetting
);
3016 dev_err(&udev
->dev
, "failed to restore interface %d "
3017 "altsetting %d (error=%d)\n",
3018 desc
->bInterfaceNumber
,
3019 desc
->bAlternateSetting
,
3029 hub_port_logical_disconnect(parent_hub
, port1
);
3032 EXPORT_SYMBOL(usb_reset_device
);
3035 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3036 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3037 * @iface: interface bound to the driver making the request (optional)
3039 * Warns all drivers bound to registered interfaces (using their pre_reset
3040 * method), performs the port reset, and then lets the drivers know that
3041 * the reset is over (using their post_reset method).
3043 * Return value is the same as for usb_reset_device().
3045 * The caller must own the device lock. For example, it's safe to use
3046 * this from a driver probe() routine after downloading new firmware.
3047 * For calls that might not occur during probe(), drivers should lock
3048 * the device using usb_lock_device_for_reset().
3050 * The interface locks are acquired during the pre_reset stage and released
3051 * during the post_reset stage. However if iface is not NULL and is
3052 * currently being probed, we assume that the caller already owns its
3055 int usb_reset_composite_device(struct usb_device
*udev
,
3056 struct usb_interface
*iface
)
3059 struct usb_host_config
*config
= udev
->actconfig
;
3061 if (udev
->state
== USB_STATE_NOTATTACHED
||
3062 udev
->state
== USB_STATE_SUSPENDED
) {
3063 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3068 /* Prevent autosuspend during the reset */
3069 usb_autoresume_device(udev
);
3071 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3076 struct usb_interface
*cintf
;
3077 struct usb_driver
*drv
;
3079 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3080 cintf
= config
->interface
[i
];
3082 down(&cintf
->dev
.sem
);
3083 if (device_is_registered(&cintf
->dev
) &&
3084 cintf
->dev
.driver
) {
3085 drv
= to_usb_driver(cintf
->dev
.driver
);
3087 (drv
->pre_reset
)(cintf
);
3092 ret
= usb_reset_device(udev
);
3096 struct usb_interface
*cintf
;
3097 struct usb_driver
*drv
;
3099 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3100 cintf
= config
->interface
[i
];
3101 if (device_is_registered(&cintf
->dev
) &&
3102 cintf
->dev
.driver
) {
3103 drv
= to_usb_driver(cintf
->dev
.driver
);
3104 if (drv
->post_reset
)
3105 (drv
->post_reset
)(cintf
, 0);
3108 up(&cintf
->dev
.sem
);
3112 usb_autosuspend_device(udev
);
3115 EXPORT_SYMBOL(usb_reset_composite_device
);