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>
34 #ifdef CONFIG_USB_PERSIST
41 struct device
*intfdev
; /* the "interface" device */
42 struct usb_device
*hdev
;
44 struct urb
*urb
; /* for interrupt polling pipe */
46 /* buffer for urb ... with extra space in case of babble */
48 dma_addr_t buffer_dma
; /* DMA address for buffer */
50 struct usb_hub_status hub
;
51 struct usb_port_status port
;
52 } *status
; /* buffer for status reports */
53 struct mutex status_mutex
; /* for the status buffer */
55 int error
; /* last reported error */
56 int nerrors
; /* track consecutive errors */
58 struct list_head event_list
; /* hubs w/data or errs ready */
59 unsigned long event_bits
[1]; /* status change bitmask */
60 unsigned long change_bits
[1]; /* ports with logical connect
62 unsigned long busy_bits
[1]; /* ports being reset or
64 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
65 #error event_bits[] is too short!
68 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
69 struct usb_tt tt
; /* Transaction Translator */
71 unsigned mA_per_port
; /* current for each child */
73 unsigned limited_power
:1;
75 unsigned activating
:1;
76 unsigned disconnected
:1;
78 unsigned has_indicators
:1;
79 u8 indicator
[USB_MAXCHILDREN
];
80 struct delayed_work leds
;
84 /* Protect struct usb_device->state and ->children members
85 * Note: Both are also protected by ->dev.sem, except that ->state can
86 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
87 static DEFINE_SPINLOCK(device_state_lock
);
89 /* khubd's worklist and its lock */
90 static DEFINE_SPINLOCK(hub_event_lock
);
91 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
94 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
96 static struct task_struct
*khubd_task
;
98 /* cycle leds on hubs that aren't blinking for attention */
99 static int blinkenlights
= 0;
100 module_param (blinkenlights
, bool, S_IRUGO
);
101 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
104 * As of 2.6.10 we introduce a new USB device initialization scheme which
105 * closely resembles the way Windows works. Hopefully it will be compatible
106 * with a wider range of devices than the old scheme. However some previously
107 * working devices may start giving rise to "device not accepting address"
108 * errors; if that happens the user can try the old scheme by adjusting the
109 * following module parameters.
111 * For maximum flexibility there are two boolean parameters to control the
112 * hub driver's behavior. On the first initialization attempt, if the
113 * "old_scheme_first" parameter is set then the old scheme will be used,
114 * otherwise the new scheme is used. If that fails and "use_both_schemes"
115 * is set, then the driver will make another attempt, using the other scheme.
117 static int old_scheme_first
= 0;
118 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
119 MODULE_PARM_DESC(old_scheme_first
,
120 "start with the old device initialization scheme");
122 static int use_both_schemes
= 1;
123 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
124 MODULE_PARM_DESC(use_both_schemes
,
125 "try the other device initialization scheme if the "
129 static inline char *portspeed(int portstatus
)
131 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
133 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
139 /* Note that hdev or one of its children must be locked! */
140 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
142 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
145 /* USB 2.0 spec Section 11.24.4.5 */
146 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
150 for (i
= 0; i
< 3; i
++) {
151 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
152 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
153 USB_DT_HUB
<< 8, 0, data
, size
,
154 USB_CTRL_GET_TIMEOUT
);
155 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
162 * USB 2.0 spec Section 11.24.2.1
164 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
166 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
167 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
171 * USB 2.0 spec Section 11.24.2.2
173 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
175 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
176 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
181 * USB 2.0 spec Section 11.24.2.13
183 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
185 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
186 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
191 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
192 * for info about using port indicators
194 static void set_port_led(
200 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
201 USB_PORT_FEAT_INDICATOR
);
203 dev_dbg (hub
->intfdev
,
204 "port %d indicator %s status %d\n",
206 ({ char *s
; switch (selector
) {
207 case HUB_LED_AMBER
: s
= "amber"; break;
208 case HUB_LED_GREEN
: s
= "green"; break;
209 case HUB_LED_OFF
: s
= "off"; break;
210 case HUB_LED_AUTO
: s
= "auto"; break;
211 default: s
= "??"; break;
216 #define LED_CYCLE_PERIOD ((2*HZ)/3)
218 static void led_work (struct work_struct
*work
)
220 struct usb_hub
*hub
=
221 container_of(work
, struct usb_hub
, leds
.work
);
222 struct usb_device
*hdev
= hub
->hdev
;
224 unsigned changed
= 0;
227 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
230 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
231 unsigned selector
, mode
;
233 /* 30%-50% duty cycle */
235 switch (hub
->indicator
[i
]) {
237 case INDICATOR_CYCLE
:
239 selector
= HUB_LED_AUTO
;
240 mode
= INDICATOR_AUTO
;
242 /* blinking green = sw attention */
243 case INDICATOR_GREEN_BLINK
:
244 selector
= HUB_LED_GREEN
;
245 mode
= INDICATOR_GREEN_BLINK_OFF
;
247 case INDICATOR_GREEN_BLINK_OFF
:
248 selector
= HUB_LED_OFF
;
249 mode
= INDICATOR_GREEN_BLINK
;
251 /* blinking amber = hw attention */
252 case INDICATOR_AMBER_BLINK
:
253 selector
= HUB_LED_AMBER
;
254 mode
= INDICATOR_AMBER_BLINK_OFF
;
256 case INDICATOR_AMBER_BLINK_OFF
:
257 selector
= HUB_LED_OFF
;
258 mode
= INDICATOR_AMBER_BLINK
;
260 /* blink green/amber = reserved */
261 case INDICATOR_ALT_BLINK
:
262 selector
= HUB_LED_GREEN
;
263 mode
= INDICATOR_ALT_BLINK_OFF
;
265 case INDICATOR_ALT_BLINK_OFF
:
266 selector
= HUB_LED_AMBER
;
267 mode
= INDICATOR_ALT_BLINK
;
272 if (selector
!= HUB_LED_AUTO
)
274 set_port_led(hub
, i
+ 1, selector
);
275 hub
->indicator
[i
] = mode
;
277 if (!changed
&& blinkenlights
) {
279 cursor
%= hub
->descriptor
->bNbrPorts
;
280 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
281 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
285 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
288 /* use a short timeout for hub/port status fetches */
289 #define USB_STS_TIMEOUT 1000
290 #define USB_STS_RETRIES 5
293 * USB 2.0 spec Section 11.24.2.6
295 static int get_hub_status(struct usb_device
*hdev
,
296 struct usb_hub_status
*data
)
298 int i
, status
= -ETIMEDOUT
;
300 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
301 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
302 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
303 data
, sizeof(*data
), USB_STS_TIMEOUT
);
309 * USB 2.0 spec Section 11.24.2.7
311 static int get_port_status(struct usb_device
*hdev
, int port1
,
312 struct usb_port_status
*data
)
314 int i
, status
= -ETIMEDOUT
;
316 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
317 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
318 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
319 data
, sizeof(*data
), USB_STS_TIMEOUT
);
324 static void kick_khubd(struct usb_hub
*hub
)
328 /* Suppress autosuspend until khubd runs */
329 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
331 spin_lock_irqsave(&hub_event_lock
, flags
);
332 if (!hub
->disconnected
& list_empty(&hub
->event_list
)) {
333 list_add_tail(&hub
->event_list
, &hub_event_list
);
334 wake_up(&khubd_wait
);
336 spin_unlock_irqrestore(&hub_event_lock
, flags
);
339 void usb_kick_khubd(struct usb_device
*hdev
)
341 /* FIXME: What if hdev isn't bound to the hub driver? */
342 kick_khubd(hdev_to_hub(hdev
));
346 /* completion function, fires on port status changes and various faults */
347 static void hub_irq(struct urb
*urb
)
349 struct usb_hub
*hub
= urb
->context
;
354 switch (urb
->status
) {
355 case -ENOENT
: /* synchronous unlink */
356 case -ECONNRESET
: /* async unlink */
357 case -ESHUTDOWN
: /* hardware going away */
360 default: /* presumably an error */
361 /* Cause a hub reset after 10 consecutive errors */
362 dev_dbg (hub
->intfdev
, "transfer --> %d\n", urb
->status
);
363 if ((++hub
->nerrors
< 10) || hub
->error
)
365 hub
->error
= urb
->status
;
368 /* let khubd handle things */
369 case 0: /* we got data: port status changed */
371 for (i
= 0; i
< urb
->actual_length
; ++i
)
372 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
374 hub
->event_bits
[0] = bits
;
380 /* Something happened, let khubd figure it out */
387 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
388 && status
!= -ENODEV
&& status
!= -EPERM
)
389 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
392 /* USB 2.0 spec Section 11.24.2.3 */
394 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
396 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
397 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
402 * enumeration blocks khubd for a long time. we use keventd instead, since
403 * long blocking there is the exception, not the rule. accordingly, HCDs
404 * talking to TTs must queue control transfers (not just bulk and iso), so
405 * both can talk to the same hub concurrently.
407 static void hub_tt_kevent (struct work_struct
*work
)
409 struct usb_hub
*hub
=
410 container_of(work
, struct usb_hub
, tt
.kevent
);
414 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
415 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
416 struct list_head
*temp
;
417 struct usb_tt_clear
*clear
;
418 struct usb_device
*hdev
= hub
->hdev
;
421 temp
= hub
->tt
.clear_list
.next
;
422 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
423 list_del (&clear
->clear_list
);
425 /* drop lock so HCD can concurrently report other TT errors */
426 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
427 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
428 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
432 "clear tt %d (%04x) error %d\n",
433 clear
->tt
, clear
->devinfo
, status
);
436 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
440 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
441 * @udev: the device whose split transaction failed
442 * @pipe: identifies the endpoint of the failed transaction
444 * High speed HCDs use this to tell the hub driver that some split control or
445 * bulk transaction failed in a way that requires clearing internal state of
446 * a transaction translator. This is normally detected (and reported) from
449 * It may not be possible for that hub to handle additional full (or low)
450 * speed transactions until that state is fully cleared out.
452 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
454 struct usb_tt
*tt
= udev
->tt
;
456 struct usb_tt_clear
*clear
;
458 /* we've got to cope with an arbitrary number of pending TT clears,
459 * since each TT has "at least two" buffers that can need it (and
460 * there can be many TTs per hub). even if they're uncommon.
462 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
463 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
464 /* FIXME recover somehow ... RESET_TT? */
468 /* info that CLEAR_TT_BUFFER needs */
469 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
470 clear
->devinfo
= usb_pipeendpoint (pipe
);
471 clear
->devinfo
|= udev
->devnum
<< 4;
472 clear
->devinfo
|= usb_pipecontrol (pipe
)
473 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
474 : (USB_ENDPOINT_XFER_BULK
<< 11);
475 if (usb_pipein (pipe
))
476 clear
->devinfo
|= 1 << 15;
478 /* tell keventd to clear state for this TT */
479 spin_lock_irqsave (&tt
->lock
, flags
);
480 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
481 schedule_work (&tt
->kevent
);
482 spin_unlock_irqrestore (&tt
->lock
, flags
);
485 static void hub_power_on(struct usb_hub
*hub
)
488 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
489 u16 wHubCharacteristics
=
490 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
492 /* Enable power on each port. Some hubs have reserved values
493 * of LPSM (> 2) in their descriptors, even though they are
494 * USB 2.0 hubs. Some hubs do not implement port-power switching
495 * but only emulate it. In all cases, the ports won't work
496 * unless we send these messages to the hub.
498 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
499 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
501 dev_dbg(hub
->intfdev
, "trying to enable port power on "
502 "non-switchable hub\n");
503 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
504 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
506 /* Wait at least 100 msec for power to become stable */
507 msleep(max(pgood_delay
, (unsigned) 100));
510 static void hub_quiesce(struct usb_hub
*hub
)
512 /* (nonblocking) khubd and related activity won't re-trigger */
516 /* (blocking) stop khubd and related activity */
517 usb_kill_urb(hub
->urb
);
518 if (hub
->has_indicators
)
519 cancel_delayed_work(&hub
->leds
);
520 if (hub
->has_indicators
|| hub
->tt
.hub
)
521 flush_scheduled_work();
524 static void hub_activate(struct usb_hub
*hub
)
531 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
533 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
534 if (hub
->has_indicators
&& blinkenlights
)
535 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
537 /* scan all ports ASAP */
541 static int hub_hub_status(struct usb_hub
*hub
,
542 u16
*status
, u16
*change
)
546 mutex_lock(&hub
->status_mutex
);
547 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
549 dev_err (hub
->intfdev
,
550 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
552 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
553 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
556 mutex_unlock(&hub
->status_mutex
);
560 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
562 struct usb_device
*hdev
= hub
->hdev
;
565 if (hdev
->children
[port1
-1] && set_state
)
566 usb_set_device_state(hdev
->children
[port1
-1],
567 USB_STATE_NOTATTACHED
);
569 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
571 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
577 * Disable a port and mark a logical connnect-change event, so that some
578 * time later khubd will disconnect() any existing usb_device on the port
579 * and will re-enumerate if there actually is a device attached.
581 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
583 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
584 hub_port_disable(hub
, port1
, 1);
586 /* FIXME let caller ask to power down the port:
587 * - some devices won't enumerate without a VBUS power cycle
588 * - SRP saves power that way
589 * - ... new call, TBD ...
590 * That's easy if this hub can switch power per-port, and
591 * khubd reactivates the port later (timer, SRP, etc).
592 * Powerdown must be optional, because of reset/DFU.
595 set_bit(port1
, hub
->change_bits
);
599 /* caller has locked the hub device */
600 static int hub_pre_reset(struct usb_interface
*intf
)
602 struct usb_hub
*hub
= usb_get_intfdata(intf
);
603 struct usb_device
*hdev
= hub
->hdev
;
606 /* Disconnect all the children */
607 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
608 if (hdev
->children
[i
])
609 usb_disconnect(&hdev
->children
[i
]);
615 /* caller has locked the hub device */
616 static int hub_post_reset(struct usb_interface
*intf
)
618 struct usb_hub
*hub
= usb_get_intfdata(intf
);
625 static int hub_configure(struct usb_hub
*hub
,
626 struct usb_endpoint_descriptor
*endpoint
)
628 struct usb_device
*hdev
= hub
->hdev
;
629 struct device
*hub_dev
= hub
->intfdev
;
630 u16 hubstatus
, hubchange
;
631 u16 wHubCharacteristics
;
636 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
639 message
= "can't allocate hub irq buffer";
644 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
646 message
= "can't kmalloc hub status buffer";
650 mutex_init(&hub
->status_mutex
);
652 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
653 if (!hub
->descriptor
) {
654 message
= "can't kmalloc hub descriptor";
659 /* Request the entire hub descriptor.
660 * hub->descriptor can handle USB_MAXCHILDREN ports,
661 * but the hub can/will return fewer bytes here.
663 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
664 sizeof(*hub
->descriptor
));
666 message
= "can't read hub descriptor";
668 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
669 message
= "hub has too many ports!";
674 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
675 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
676 (hdev
->maxchild
== 1) ? "" : "s");
678 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
680 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
682 char portstr
[USB_MAXCHILDREN
+ 1];
684 for (i
= 0; i
< hdev
->maxchild
; i
++)
685 portstr
[i
] = hub
->descriptor
->DeviceRemovable
686 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
688 portstr
[hdev
->maxchild
] = 0;
689 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
691 dev_dbg(hub_dev
, "standalone hub\n");
693 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
695 dev_dbg(hub_dev
, "ganged power switching\n");
698 dev_dbg(hub_dev
, "individual port power switching\n");
702 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
706 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
708 dev_dbg(hub_dev
, "global over-current protection\n");
711 dev_dbg(hub_dev
, "individual port over-current protection\n");
715 dev_dbg(hub_dev
, "no over-current protection\n");
719 spin_lock_init (&hub
->tt
.lock
);
720 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
721 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
);
722 switch (hdev
->descriptor
.bDeviceProtocol
) {
726 dev_dbg(hub_dev
, "Single TT\n");
730 ret
= usb_set_interface(hdev
, 0, 1);
732 dev_dbg(hub_dev
, "TT per port\n");
735 dev_err(hub_dev
, "Using single TT (err %d)\n",
740 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
741 hdev
->descriptor
.bDeviceProtocol
);
745 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
746 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
747 case HUB_TTTT_8_BITS
:
748 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
749 hub
->tt
.think_time
= 666;
750 dev_dbg(hub_dev
, "TT requires at most %d "
751 "FS bit times (%d ns)\n",
752 8, hub
->tt
.think_time
);
755 case HUB_TTTT_16_BITS
:
756 hub
->tt
.think_time
= 666 * 2;
757 dev_dbg(hub_dev
, "TT requires at most %d "
758 "FS bit times (%d ns)\n",
759 16, hub
->tt
.think_time
);
761 case HUB_TTTT_24_BITS
:
762 hub
->tt
.think_time
= 666 * 3;
763 dev_dbg(hub_dev
, "TT requires at most %d "
764 "FS bit times (%d ns)\n",
765 24, hub
->tt
.think_time
);
767 case HUB_TTTT_32_BITS
:
768 hub
->tt
.think_time
= 666 * 4;
769 dev_dbg(hub_dev
, "TT requires at most %d "
770 "FS bit times (%d ns)\n",
771 32, hub
->tt
.think_time
);
775 /* probe() zeroes hub->indicator[] */
776 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
777 hub
->has_indicators
= 1;
778 dev_dbg(hub_dev
, "Port indicators are supported\n");
781 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
782 hub
->descriptor
->bPwrOn2PwrGood
* 2);
784 /* power budgeting mostly matters with bus-powered hubs,
785 * and battery-powered root hubs (may provide just 8 mA).
787 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
789 message
= "can't get hub status";
792 le16_to_cpus(&hubstatus
);
793 if (hdev
== hdev
->bus
->root_hub
) {
794 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
795 hub
->mA_per_port
= 500;
797 hub
->mA_per_port
= hdev
->bus_mA
;
798 hub
->limited_power
= 1;
800 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
801 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
802 hub
->descriptor
->bHubContrCurrent
);
803 hub
->limited_power
= 1;
804 if (hdev
->maxchild
> 0) {
805 int remaining
= hdev
->bus_mA
-
806 hub
->descriptor
->bHubContrCurrent
;
808 if (remaining
< hdev
->maxchild
* 100)
810 "insufficient power available "
811 "to use all downstream ports\n");
812 hub
->mA_per_port
= 100; /* 7.2.1.1 */
814 } else { /* Self-powered external hub */
815 /* FIXME: What about battery-powered external hubs that
816 * provide less current per port? */
817 hub
->mA_per_port
= 500;
819 if (hub
->mA_per_port
< 500)
820 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
823 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
825 message
= "can't get hub status";
829 /* local power status reports aren't always correct */
830 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
831 dev_dbg(hub_dev
, "local power source is %s\n",
832 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
833 ? "lost (inactive)" : "good");
835 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
836 dev_dbg(hub_dev
, "%sover-current condition exists\n",
837 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
839 /* set up the interrupt endpoint
840 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
841 * bytes as USB2.0[11.12.3] says because some hubs are known
842 * to send more data (and thus cause overflow). For root hubs,
843 * maxpktsize is defined in hcd.c's fake endpoint descriptors
844 * to be big enough for at least USB_MAXCHILDREN ports. */
845 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
846 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
848 if (maxp
> sizeof(*hub
->buffer
))
849 maxp
= sizeof(*hub
->buffer
);
851 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
853 message
= "couldn't allocate interrupt urb";
858 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
859 hub
, endpoint
->bInterval
);
860 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
861 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
863 /* maybe cycle the hub leds */
864 if (hub
->has_indicators
&& blinkenlights
)
865 hub
->indicator
[0] = INDICATOR_CYCLE
;
872 dev_err (hub_dev
, "config failed, %s (err %d)\n",
874 /* hub_disconnect() frees urb and descriptor */
878 static void hub_release(struct kref
*kref
)
880 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
882 usb_put_intf(to_usb_interface(hub
->intfdev
));
886 static unsigned highspeed_hubs
;
888 static void hub_disconnect(struct usb_interface
*intf
)
890 struct usb_hub
*hub
= usb_get_intfdata (intf
);
892 /* Take the hub off the event list and don't let it be added again */
893 spin_lock_irq(&hub_event_lock
);
894 list_del_init(&hub
->event_list
);
895 hub
->disconnected
= 1;
896 spin_unlock_irq(&hub_event_lock
);
898 /* Disconnect all children and quiesce the hub */
902 usb_set_intfdata (intf
, NULL
);
904 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
907 usb_free_urb(hub
->urb
);
908 kfree(hub
->descriptor
);
910 usb_buffer_free(hub
->hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
913 kref_put(&hub
->kref
, hub_release
);
916 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
918 struct usb_host_interface
*desc
;
919 struct usb_endpoint_descriptor
*endpoint
;
920 struct usb_device
*hdev
;
923 desc
= intf
->cur_altsetting
;
924 hdev
= interface_to_usbdev(intf
);
926 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
928 dev_warn(&intf
->dev
, "ignoring external hub\n");
933 /* Some hubs have a subclass of 1, which AFAICT according to the */
934 /* specs is not defined, but it works */
935 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
936 (desc
->desc
.bInterfaceSubClass
!= 1)) {
938 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
942 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
943 if (desc
->desc
.bNumEndpoints
!= 1)
944 goto descriptor_error
;
946 endpoint
= &desc
->endpoint
[0].desc
;
948 /* If it's not an interrupt in endpoint, we'd better punt! */
949 if (!usb_endpoint_is_int_in(endpoint
))
950 goto descriptor_error
;
953 dev_info (&intf
->dev
, "USB hub found\n");
955 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
957 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
961 kref_init(&hub
->kref
);
962 INIT_LIST_HEAD(&hub
->event_list
);
963 hub
->intfdev
= &intf
->dev
;
965 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
968 usb_set_intfdata (intf
, hub
);
969 intf
->needs_remote_wakeup
= 1;
971 if (hdev
->speed
== USB_SPEED_HIGH
)
974 if (hub_configure(hub
, endpoint
) >= 0)
977 hub_disconnect (intf
);
982 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
984 struct usb_device
*hdev
= interface_to_usbdev (intf
);
986 /* assert ifno == 0 (part of hub spec) */
988 case USBDEVFS_HUB_PORTINFO
: {
989 struct usbdevfs_hub_portinfo
*info
= user_data
;
992 spin_lock_irq(&device_state_lock
);
993 if (hdev
->devnum
<= 0)
996 info
->nports
= hdev
->maxchild
;
997 for (i
= 0; i
< info
->nports
; i
++) {
998 if (hdev
->children
[i
] == NULL
)
1002 hdev
->children
[i
]->devnum
;
1005 spin_unlock_irq(&device_state_lock
);
1007 return info
->nports
+ 1;
1016 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1020 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1021 if (udev
->children
[i
])
1022 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1024 if (udev
->state
== USB_STATE_SUSPENDED
)
1025 udev
->discon_suspended
= 1;
1026 udev
->state
= USB_STATE_NOTATTACHED
;
1030 * usb_set_device_state - change a device's current state (usbcore, hcds)
1031 * @udev: pointer to device whose state should be changed
1032 * @new_state: new state value to be stored
1034 * udev->state is _not_ fully protected by the device lock. Although
1035 * most transitions are made only while holding the lock, the state can
1036 * can change to USB_STATE_NOTATTACHED at almost any time. This
1037 * is so that devices can be marked as disconnected as soon as possible,
1038 * without having to wait for any semaphores to be released. As a result,
1039 * all changes to any device's state must be protected by the
1040 * device_state_lock spinlock.
1042 * Once a device has been added to the device tree, all changes to its state
1043 * should be made using this routine. The state should _not_ be set directly.
1045 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1046 * Otherwise udev->state is set to new_state, and if new_state is
1047 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1048 * to USB_STATE_NOTATTACHED.
1050 void usb_set_device_state(struct usb_device
*udev
,
1051 enum usb_device_state new_state
)
1053 unsigned long flags
;
1055 spin_lock_irqsave(&device_state_lock
, flags
);
1056 if (udev
->state
== USB_STATE_NOTATTACHED
)
1058 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1060 /* root hub wakeup capabilities are managed out-of-band
1061 * and may involve silicon errata ... ignore them here.
1064 if (udev
->state
== USB_STATE_SUSPENDED
1065 || new_state
== USB_STATE_SUSPENDED
)
1066 ; /* No change to wakeup settings */
1067 else if (new_state
== USB_STATE_CONFIGURED
)
1068 device_init_wakeup(&udev
->dev
,
1069 (udev
->actconfig
->desc
.bmAttributes
1070 & USB_CONFIG_ATT_WAKEUP
));
1072 device_init_wakeup(&udev
->dev
, 0);
1074 udev
->state
= new_state
;
1076 recursively_mark_NOTATTACHED(udev
);
1077 spin_unlock_irqrestore(&device_state_lock
, flags
);
1080 static void choose_address(struct usb_device
*udev
)
1083 struct usb_bus
*bus
= udev
->bus
;
1085 /* If khubd ever becomes multithreaded, this will need a lock */
1087 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1088 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1091 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1093 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1096 set_bit(devnum
, bus
->devmap
.devicemap
);
1097 udev
->devnum
= devnum
;
1101 static void release_address(struct usb_device
*udev
)
1103 if (udev
->devnum
> 0) {
1104 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1109 #ifdef CONFIG_USB_SUSPEND
1111 static void usb_stop_pm(struct usb_device
*udev
)
1113 /* Synchronize with the ksuspend thread to prevent any more
1114 * autosuspend requests from being submitted, and decrement
1115 * the parent's count of unsuspended children.
1118 if (udev
->parent
&& !udev
->discon_suspended
)
1119 usb_autosuspend_device(udev
->parent
);
1120 usb_pm_unlock(udev
);
1122 /* Stop any autosuspend requests already submitted */
1123 cancel_rearming_delayed_work(&udev
->autosuspend
);
1128 static inline void usb_stop_pm(struct usb_device
*udev
)
1134 * usb_disconnect - disconnect a device (usbcore-internal)
1135 * @pdev: pointer to device being disconnected
1136 * Context: !in_interrupt ()
1138 * Something got disconnected. Get rid of it and all of its children.
1140 * If *pdev is a normal device then the parent hub must already be locked.
1141 * If *pdev is a root hub then this routine will acquire the
1142 * usb_bus_list_lock on behalf of the caller.
1144 * Only hub drivers (including virtual root hub drivers for host
1145 * controllers) should ever call this.
1147 * This call is synchronous, and may not be used in an interrupt context.
1149 void usb_disconnect(struct usb_device
**pdev
)
1151 struct usb_device
*udev
= *pdev
;
1155 pr_debug ("%s nodev\n", __FUNCTION__
);
1159 /* mark the device as inactive, so any further urb submissions for
1160 * this device (and any of its children) will fail immediately.
1161 * this quiesces everyting except pending urbs.
1163 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1164 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1166 usb_lock_device(udev
);
1168 /* Free up all the children before we remove this device */
1169 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1170 if (udev
->children
[i
])
1171 usb_disconnect(&udev
->children
[i
]);
1174 /* deallocate hcd/hardware state ... nuking all pending urbs and
1175 * cleaning up all state associated with the current configuration
1176 * so that the hardware is now fully quiesced.
1178 dev_dbg (&udev
->dev
, "unregistering device\n");
1179 usb_disable_device(udev
, 0);
1181 usb_unlock_device(udev
);
1183 /* Unregister the device. The device driver is responsible
1184 * for removing the device files from usbfs and sysfs and for
1185 * de-configuring the device.
1187 device_del(&udev
->dev
);
1189 /* Free the device number and delete the parent's children[]
1190 * (or root_hub) pointer.
1192 release_address(udev
);
1194 /* Avoid races with recursively_mark_NOTATTACHED() */
1195 spin_lock_irq(&device_state_lock
);
1197 spin_unlock_irq(&device_state_lock
);
1201 put_device(&udev
->dev
);
1205 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1209 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1213 static inline void show_string(struct usb_device
*udev
, char *id
, char *string
)
1218 #ifdef CONFIG_USB_OTG
1219 #include "otg_whitelist.h"
1223 * usb_new_device - perform initial device setup (usbcore-internal)
1224 * @udev: newly addressed device (in ADDRESS state)
1226 * This is called with devices which have been enumerated, but not yet
1227 * configured. The device descriptor is available, but not descriptors
1228 * for any device configuration. The caller must have locked either
1229 * the parent hub (if udev is a normal device) or else the
1230 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1231 * udev has already been installed, but udev is not yet visible through
1232 * sysfs or other filesystem code.
1234 * It will return if the device is configured properly or not. Zero if
1235 * the interface was registered with the driver core; else a negative
1238 * This call is synchronous, and may not be used in an interrupt context.
1240 * Only the hub driver or root-hub registrar should ever call this.
1242 int usb_new_device(struct usb_device
*udev
)
1246 /* Determine quirks */
1247 usb_detect_quirks(udev
);
1249 err
= usb_get_configuration(udev
);
1251 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1256 /* read the standard strings and cache them if present */
1257 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1258 udev
->manufacturer
= usb_cache_string(udev
,
1259 udev
->descriptor
.iManufacturer
);
1260 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1262 /* Tell the world! */
1263 dev_dbg(&udev
->dev
, "new device strings: Mfr=%d, Product=%d, "
1264 "SerialNumber=%d\n",
1265 udev
->descriptor
.iManufacturer
,
1266 udev
->descriptor
.iProduct
,
1267 udev
->descriptor
.iSerialNumber
);
1268 show_string(udev
, "Product", udev
->product
);
1269 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1270 show_string(udev
, "SerialNumber", udev
->serial
);
1272 #ifdef CONFIG_USB_OTG
1274 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1275 * to wake us after we've powered off VBUS; and HNP, switching roles
1276 * "host" to "peripheral". The OTG descriptor helps figure this out.
1278 if (!udev
->bus
->is_b_host
1280 && udev
->parent
== udev
->bus
->root_hub
) {
1281 struct usb_otg_descriptor
*desc
= 0;
1282 struct usb_bus
*bus
= udev
->bus
;
1284 /* descriptor may appear anywhere in config */
1285 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1286 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1287 USB_DT_OTG
, (void **) &desc
) == 0) {
1288 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1289 unsigned port1
= udev
->portnum
;
1291 dev_info(&udev
->dev
,
1292 "Dual-Role OTG device on %sHNP port\n",
1293 (port1
== bus
->otg_port
)
1296 /* enable HNP before suspend, it's simpler */
1297 if (port1
== bus
->otg_port
)
1298 bus
->b_hnp_enable
= 1;
1299 err
= usb_control_msg(udev
,
1300 usb_sndctrlpipe(udev
, 0),
1301 USB_REQ_SET_FEATURE
, 0,
1303 ? USB_DEVICE_B_HNP_ENABLE
1304 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1305 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1307 /* OTG MESSAGE: report errors here,
1308 * customize to match your product.
1310 dev_info(&udev
->dev
,
1311 "can't set HNP mode; %d\n",
1313 bus
->b_hnp_enable
= 0;
1319 if (!is_targeted(udev
)) {
1321 /* Maybe it can talk to us, though we can't talk to it.
1322 * (Includes HNP test device.)
1324 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1325 err
= usb_port_suspend(udev
);
1327 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1334 /* export the usbdev device-node for libusb */
1335 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1336 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1338 /* Register the device. The device driver is responsible
1339 * for adding the device files to sysfs and for configuring
1342 err
= device_add(&udev
->dev
);
1344 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1348 /* Increment the parent's count of unsuspended children */
1350 usb_autoresume_device(udev
->parent
);
1356 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1360 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1361 u16
*status
, u16
*change
)
1365 mutex_lock(&hub
->status_mutex
);
1366 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1368 dev_err (hub
->intfdev
,
1369 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1373 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1374 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1377 mutex_unlock(&hub
->status_mutex
);
1382 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1383 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1385 struct usb_hcd
*hcd
;
1386 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1388 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1389 return hcd
->wireless
;
1393 #define PORT_RESET_TRIES 5
1394 #define SET_ADDRESS_TRIES 2
1395 #define GET_DESCRIPTOR_TRIES 2
1396 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1397 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1399 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1400 #define HUB_SHORT_RESET_TIME 10
1401 #define HUB_LONG_RESET_TIME 200
1402 #define HUB_RESET_TIMEOUT 500
1404 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1405 struct usb_device
*udev
, unsigned int delay
)
1407 int delay_time
, ret
;
1411 for (delay_time
= 0;
1412 delay_time
< HUB_RESET_TIMEOUT
;
1413 delay_time
+= delay
) {
1414 /* wait to give the device a chance to reset */
1417 /* read and decode port status */
1418 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1422 /* Device went away? */
1423 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1426 /* bomb out completely if the connection bounced */
1427 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1430 /* if we`ve finished resetting, then break out of the loop */
1431 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1432 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1433 if (hub_is_wusb(hub
))
1434 udev
->speed
= USB_SPEED_VARIABLE
;
1435 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1436 udev
->speed
= USB_SPEED_HIGH
;
1437 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1438 udev
->speed
= USB_SPEED_LOW
;
1440 udev
->speed
= USB_SPEED_FULL
;
1444 /* switch to the long delay after two short delay failures */
1445 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1446 delay
= HUB_LONG_RESET_TIME
;
1448 dev_dbg (hub
->intfdev
,
1449 "port %d not reset yet, waiting %dms\n",
1456 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1457 struct usb_device
*udev
, unsigned int delay
)
1461 /* Reset the port */
1462 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1463 status
= set_port_feature(hub
->hdev
,
1464 port1
, USB_PORT_FEAT_RESET
);
1466 dev_err(hub
->intfdev
,
1467 "cannot reset port %d (err = %d)\n",
1470 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1471 if (status
&& status
!= -ENOTCONN
)
1472 dev_dbg(hub
->intfdev
,
1473 "port_wait_reset: err = %d\n",
1477 /* return on disconnect or reset */
1480 /* TRSTRCY = 10 ms; plus some extra */
1485 clear_port_feature(hub
->hdev
,
1486 port1
, USB_PORT_FEAT_C_RESET
);
1487 /* FIXME need disconnect() for NOTATTACHED device */
1488 usb_set_device_state(udev
, status
1489 ? USB_STATE_NOTATTACHED
1490 : USB_STATE_DEFAULT
);
1494 dev_dbg (hub
->intfdev
,
1495 "port %d not enabled, trying reset again...\n",
1497 delay
= HUB_LONG_RESET_TIME
;
1500 dev_err (hub
->intfdev
,
1501 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1509 #ifdef CONFIG_USB_SUSPEND
1512 * usb_port_suspend - suspend a usb device's upstream port
1513 * @udev: device that's no longer in active use, not a root hub
1514 * Context: must be able to sleep; device not locked; pm locks held
1516 * Suspends a USB device that isn't in active use, conserving power.
1517 * Devices may wake out of a suspend, if anything important happens,
1518 * using the remote wakeup mechanism. They may also be taken out of
1519 * suspend by the host, using usb_port_resume(). It's also routine
1520 * to disconnect devices while they are suspended.
1522 * This only affects the USB hardware for a device; its interfaces
1523 * (and, for hubs, child devices) must already have been suspended.
1525 * Selective port suspend reduces power; most suspended devices draw
1526 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1527 * All devices below the suspended port are also suspended.
1529 * Devices leave suspend state when the host wakes them up. Some devices
1530 * also support "remote wakeup", where the device can activate the USB
1531 * tree above them to deliver data, such as a keypress or packet. In
1532 * some cases, this wakes the USB host.
1534 * Suspending OTG devices may trigger HNP, if that's been enabled
1535 * between a pair of dual-role devices. That will change roles, such
1536 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1538 * Devices on USB hub ports have only one "suspend" state, corresponding
1539 * to ACPI D2, "may cause the device to lose some context".
1540 * State transitions include:
1542 * - suspend, resume ... when the VBUS power link stays live
1543 * - suspend, disconnect ... VBUS lost
1545 * Once VBUS drop breaks the circuit, the port it's using has to go through
1546 * normal re-enumeration procedures, starting with enabling VBUS power.
1547 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1548 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1549 * timer, no SRP, no requests through sysfs.
1551 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1552 * the root hub for their bus goes into global suspend ... so we don't
1553 * (falsely) update the device power state to say it suspended.
1555 * Returns 0 on success, else negative errno.
1557 int usb_port_suspend(struct usb_device
*udev
)
1559 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1560 int port1
= udev
->portnum
;
1563 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1565 /* enable remote wakeup when appropriate; this lets the device
1566 * wake up the upstream hub (including maybe the root hub).
1568 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1569 * we don't explicitly enable it here.
1571 if (udev
->do_remote_wakeup
) {
1572 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1573 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1574 USB_DEVICE_REMOTE_WAKEUP
, 0,
1576 USB_CTRL_SET_TIMEOUT
);
1578 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
1583 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1585 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
1587 /* paranoia: "should not happen" */
1588 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1589 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1590 USB_DEVICE_REMOTE_WAKEUP
, 0,
1592 USB_CTRL_SET_TIMEOUT
);
1594 /* device has up to 10 msec to fully suspend */
1595 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1596 udev
->auto_pm
? "auto-" : "");
1597 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1604 * If the USB "suspend" state is in use (rather than "global suspend"),
1605 * many devices will be individually taken out of suspend state using
1606 * special "resume" signaling. This routine kicks in shortly after
1607 * hardware resume signaling is finished, either because of selective
1608 * resume (by host) or remote wakeup (by device) ... now see what changed
1609 * in the tree that's rooted at this device.
1611 * If @udev->reset_resume is set then the device is reset before the
1612 * status check is done.
1614 static int finish_port_resume(struct usb_device
*udev
)
1619 /* caller owns the udev device lock */
1620 dev_dbg(&udev
->dev
, "finish %sresume\n",
1621 udev
->reset_resume
? "reset-" : "");
1623 /* usb ch9 identifies four variants of SUSPENDED, based on what
1624 * state the device resumes to. Linux currently won't see the
1625 * first two on the host side; they'd be inside hub_port_init()
1626 * during many timeouts, but khubd can't suspend until later.
1628 usb_set_device_state(udev
, udev
->actconfig
1629 ? USB_STATE_CONFIGURED
1630 : USB_STATE_ADDRESS
);
1632 /* 10.5.4.5 says not to reset a suspended port if the attached
1633 * device is enabled for remote wakeup. Hence the reset
1634 * operation is carried out here, after the port has been
1637 if (udev
->reset_resume
)
1638 status
= usb_reset_device(udev
);
1640 /* 10.5.4.5 says be sure devices in the tree are still there.
1641 * For now let's assume the device didn't go crazy on resume,
1642 * and device drivers will know about any resume quirks.
1645 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1647 status
= (status
== 2 ? 0 : -ENODEV
);
1651 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
1653 } else if (udev
->actconfig
) {
1654 le16_to_cpus(&devstatus
);
1655 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
1656 status
= usb_control_msg(udev
,
1657 usb_sndctrlpipe(udev
, 0),
1658 USB_REQ_CLEAR_FEATURE
,
1660 USB_DEVICE_REMOTE_WAKEUP
, 0,
1662 USB_CTRL_SET_TIMEOUT
);
1664 dev_dbg(&udev
->dev
, "disable remote "
1665 "wakeup, status %d\n", status
);
1673 * usb_port_resume - re-activate a suspended usb device's upstream port
1674 * @udev: device to re-activate, not a root hub
1675 * Context: must be able to sleep; device not locked; pm locks held
1677 * This will re-activate the suspended device, increasing power usage
1678 * while letting drivers communicate again with its endpoints.
1679 * USB resume explicitly guarantees that the power session between
1680 * the host and the device is the same as it was when the device
1683 * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this
1684 * routine won't check that the port is still enabled. Furthermore,
1685 * if @udev->reset_resume is set then finish_port_resume() above will
1686 * reset @udev. The end result is that a broken power session can be
1687 * recovered and @udev will appear to persist across a loss of VBUS power.
1689 * For example, if a host controller doesn't maintain VBUS suspend current
1690 * during a system sleep or is reset when the system wakes up, all the USB
1691 * power sessions below it will be broken. This is especially troublesome
1692 * for mass-storage devices containing mounted filesystems, since the
1693 * device will appear to have disconnected and all the memory mappings
1694 * to it will be lost. Using the USB_PERSIST facility, the device can be
1695 * made to appear as if it had not disconnected.
1697 * This facility is inherently dangerous. Although usb_reset_device()
1698 * makes every effort to insure that the same device is present after the
1699 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
1700 * quite possible for a device to remain unaltered but its media to be
1701 * changed. If the user replaces a flash memory card while the system is
1702 * asleep, he will have only himself to blame when the filesystem on the
1703 * new card is corrupted and the system crashes.
1705 * Returns 0 on success, else negative errno.
1707 int usb_port_resume(struct usb_device
*udev
)
1709 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1710 int port1
= udev
->portnum
;
1712 u16 portchange
, portstatus
;
1713 unsigned mask_flags
, want_flags
;
1715 /* Skip the initial Clear-Suspend step for a remote wakeup */
1716 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1717 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
1718 goto SuspendCleared
;
1720 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1722 set_bit(port1
, hub
->busy_bits
);
1724 /* see 7.1.7.7; affects power usage, but not budgeting */
1725 status
= clear_port_feature(hub
->hdev
,
1726 port1
, USB_PORT_FEAT_SUSPEND
);
1728 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
1731 /* drive resume for at least 20 msec */
1732 dev_dbg(&udev
->dev
, "usb %sresume\n",
1733 udev
->auto_pm
? "auto-" : "");
1736 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1737 * stop resume signaling. Then finish the resume
1740 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1743 if (USB_PERSIST
&& udev
->reset_resume
)
1744 want_flags
= USB_PORT_STAT_POWER
1745 | USB_PORT_STAT_CONNECTION
;
1747 want_flags
= USB_PORT_STAT_POWER
1748 | USB_PORT_STAT_CONNECTION
1749 | USB_PORT_STAT_ENABLE
;
1750 mask_flags
= want_flags
| USB_PORT_STAT_SUSPEND
;
1752 if (status
< 0 || (portstatus
& mask_flags
) != want_flags
) {
1753 dev_dbg(hub
->intfdev
,
1754 "port %d status %04x.%04x after resume, %d\n",
1755 port1
, portchange
, portstatus
, status
);
1759 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1760 clear_port_feature(hub
->hdev
, port1
,
1761 USB_PORT_FEAT_C_SUSPEND
);
1762 /* TRSMRCY = 10 msec */
1767 clear_bit(port1
, hub
->busy_bits
);
1768 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
1769 usb_enable_root_hub_irq(hub
->hdev
->bus
);
1772 status
= finish_port_resume(udev
);
1774 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
1775 hub_port_logical_disconnect(hub
, port1
);
1780 static int remote_wakeup(struct usb_device
*udev
)
1784 usb_lock_device(udev
);
1785 if (udev
->state
== USB_STATE_SUSPENDED
) {
1786 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
1787 usb_mark_last_busy(udev
);
1788 status
= usb_external_resume_device(udev
);
1790 usb_unlock_device(udev
);
1794 #else /* CONFIG_USB_SUSPEND */
1796 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1798 int usb_port_suspend(struct usb_device
*udev
)
1803 int usb_port_resume(struct usb_device
*udev
)
1807 /* However we may need to do a reset-resume */
1808 if (udev
->reset_resume
) {
1809 dev_dbg(&udev
->dev
, "reset-resume\n");
1810 status
= usb_reset_device(udev
);
1815 static inline int remote_wakeup(struct usb_device
*udev
)
1822 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1824 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1825 struct usb_device
*hdev
= hub
->hdev
;
1828 /* fail if children aren't already suspended */
1829 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1830 struct usb_device
*udev
;
1832 udev
= hdev
->children
[port1
-1];
1833 if (udev
&& msg
.event
== PM_EVENT_SUSPEND
&&
1834 #ifdef CONFIG_USB_SUSPEND
1835 udev
->state
!= USB_STATE_SUSPENDED
1837 udev
->dev
.power
.power_state
.event
1842 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
1848 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1850 /* stop khubd and related activity */
1855 static int hub_resume(struct usb_interface
*intf
)
1857 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1859 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1861 /* tell khubd to look for changes on this hub */
1866 static int hub_reset_resume(struct usb_interface
*intf
)
1868 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1869 struct usb_device
*hdev
= hub
->hdev
;
1874 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
1875 struct usb_device
*child
= hdev
->children
[port1
-1];
1879 /* For "USB_PERSIST"-enabled children we must
1880 * mark the child device for reset-resume and
1881 * turn off the connect-change status to prevent
1882 * khubd from disconnecting it later.
1884 if (USB_PERSIST
&& child
->persist_enabled
) {
1885 child
->reset_resume
= 1;
1886 clear_port_feature(hdev
, port1
,
1887 USB_PORT_FEAT_C_CONNECTION
);
1889 /* Otherwise we must disconnect the child,
1890 * but as we may not lock the child device here
1891 * we have to do a "logical" disconnect.
1894 hub_port_logical_disconnect(hub
, port1
);
1904 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1905 * @rhdev: struct usb_device for the root hub
1907 * The USB host controller driver calls this function when its root hub
1908 * is resumed and Vbus power has been interrupted or the controller
1909 * has been reset. The routine marks @rhdev as having lost power. When
1910 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
1911 * is enabled then it will carry out power-session recovery, otherwise
1912 * it will disconnect all the child devices.
1914 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
1916 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
1917 rhdev
->reset_resume
= 1;
1919 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
1921 #else /* CONFIG_PM */
1923 static inline int remote_wakeup(struct usb_device
*udev
)
1928 #define hub_suspend NULL
1929 #define hub_resume NULL
1930 #define hub_reset_resume NULL
1934 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1936 * Between connect detection and reset signaling there must be a delay
1937 * of 100ms at least for debounce and power-settling. The corresponding
1938 * timer shall restart whenever the downstream port detects a disconnect.
1940 * Apparently there are some bluetooth and irda-dongles and a number of
1941 * low-speed devices for which this debounce period may last over a second.
1942 * Not covered by the spec - but easy to deal with.
1944 * This implementation uses a 1500ms total debounce timeout; if the
1945 * connection isn't stable by then it returns -ETIMEDOUT. It checks
1946 * every 25ms for transient disconnects. When the port status has been
1947 * unchanged for 100ms it returns the port status.
1950 #define HUB_DEBOUNCE_TIMEOUT 1500
1951 #define HUB_DEBOUNCE_STEP 25
1952 #define HUB_DEBOUNCE_STABLE 100
1954 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
1957 int total_time
, stable_time
= 0;
1958 u16 portchange
, portstatus
;
1959 unsigned connection
= 0xffff;
1961 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
1962 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1966 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
1967 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
1968 stable_time
+= HUB_DEBOUNCE_STEP
;
1969 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
1973 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
1976 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
1977 clear_port_feature(hub
->hdev
, port1
,
1978 USB_PORT_FEAT_C_CONNECTION
);
1981 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
1983 msleep(HUB_DEBOUNCE_STEP
);
1986 dev_dbg (hub
->intfdev
,
1987 "debounce: port %d: total %dms stable %dms status 0x%x\n",
1988 port1
, total_time
, stable_time
, portstatus
);
1990 if (stable_time
< HUB_DEBOUNCE_STABLE
)
1995 static void ep0_reinit(struct usb_device
*udev
)
1997 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
1998 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
1999 udev
->ep_in
[0] = udev
->ep_out
[0] = &udev
->ep0
;
2002 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2003 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2005 static int hub_set_address(struct usb_device
*udev
)
2009 if (udev
->devnum
== 0)
2011 if (udev
->state
== USB_STATE_ADDRESS
)
2013 if (udev
->state
!= USB_STATE_DEFAULT
)
2015 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2016 USB_REQ_SET_ADDRESS
, 0, udev
->devnum
, 0,
2017 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2019 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2025 /* Reset device, (re)assign address, get device descriptor.
2026 * Device connection must be stable, no more debouncing needed.
2027 * Returns device in USB_STATE_ADDRESS, except on error.
2029 * If this is called for an already-existing device (as part of
2030 * usb_reset_device), the caller must own the device lock. For a
2031 * newly detected device that is not accessible through any global
2032 * pointers, it's not necessary to lock the device.
2035 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2038 static DEFINE_MUTEX(usb_address0_mutex
);
2040 struct usb_device
*hdev
= hub
->hdev
;
2042 unsigned delay
= HUB_SHORT_RESET_TIME
;
2043 enum usb_device_speed oldspeed
= udev
->speed
;
2046 /* root hub ports have a slightly longer reset period
2047 * (from USB 2.0 spec, section 7.1.7.5)
2049 if (!hdev
->parent
) {
2050 delay
= HUB_ROOT_RESET_TIME
;
2051 if (port1
== hdev
->bus
->otg_port
)
2052 hdev
->bus
->b_hnp_enable
= 0;
2055 /* Some low speed devices have problems with the quick delay, so */
2056 /* be a bit pessimistic with those devices. RHbug #23670 */
2057 if (oldspeed
== USB_SPEED_LOW
)
2058 delay
= HUB_LONG_RESET_TIME
;
2060 mutex_lock(&usb_address0_mutex
);
2062 /* Reset the device; full speed may morph to high speed */
2063 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2064 if (retval
< 0) /* error or disconnect */
2066 /* success, speed is known */
2069 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2070 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2073 oldspeed
= udev
->speed
;
2075 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2076 * it's fixed size except for full speed devices.
2077 * For Wireless USB devices, ep0 max packet is always 512 (tho
2078 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2080 switch (udev
->speed
) {
2081 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2082 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2084 case USB_SPEED_HIGH
: /* fixed at 64 */
2085 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2087 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2088 /* to determine the ep0 maxpacket size, try to read
2089 * the device descriptor to get bMaxPacketSize0 and
2090 * then correct our initial guess.
2092 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2094 case USB_SPEED_LOW
: /* fixed at 8 */
2095 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2102 switch (udev
->speed
) {
2103 case USB_SPEED_LOW
: speed
= "low"; break;
2104 case USB_SPEED_FULL
: speed
= "full"; break;
2105 case USB_SPEED_HIGH
: speed
= "high"; break;
2106 case USB_SPEED_VARIABLE
:
2110 default: speed
= "?"; break;
2112 dev_info (&udev
->dev
,
2113 "%s %s speed %sUSB device using %s and address %d\n",
2114 (udev
->config
) ? "reset" : "new", speed
, type
,
2115 udev
->bus
->controller
->driver
->name
, udev
->devnum
);
2117 /* Set up TT records, if needed */
2119 udev
->tt
= hdev
->tt
;
2120 udev
->ttport
= hdev
->ttport
;
2121 } else if (udev
->speed
!= USB_SPEED_HIGH
2122 && hdev
->speed
== USB_SPEED_HIGH
) {
2123 udev
->tt
= &hub
->tt
;
2124 udev
->ttport
= port1
;
2127 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2128 * Because device hardware and firmware is sometimes buggy in
2129 * this area, and this is how Linux has done it for ages.
2130 * Change it cautiously.
2132 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2133 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2134 * so it may help with some non-standards-compliant devices.
2135 * Otherwise we start with SET_ADDRESS and then try to read the
2136 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2139 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2140 if (USE_NEW_SCHEME(retry_counter
)) {
2141 struct usb_device_descriptor
*buf
;
2144 #define GET_DESCRIPTOR_BUFSIZE 64
2145 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2151 /* Retry on all errors; some devices are flakey.
2152 * 255 is for WUSB devices, we actually need to use
2153 * 512 (WUSB1.0[4.8.1]).
2155 for (j
= 0; j
< 3; ++j
) {
2156 buf
->bMaxPacketSize0
= 0;
2157 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2158 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2159 USB_DT_DEVICE
<< 8, 0,
2160 buf
, GET_DESCRIPTOR_BUFSIZE
,
2161 USB_CTRL_GET_TIMEOUT
);
2162 switch (buf
->bMaxPacketSize0
) {
2163 case 8: case 16: case 32: case 64: case 255:
2164 if (buf
->bDescriptorType
==
2178 udev
->descriptor
.bMaxPacketSize0
=
2179 buf
->bMaxPacketSize0
;
2182 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2183 if (retval
< 0) /* error or disconnect */
2185 if (oldspeed
!= udev
->speed
) {
2187 "device reset changed speed!\n");
2192 dev_err(&udev
->dev
, "device descriptor "
2193 "read/%s, error %d\n",
2198 #undef GET_DESCRIPTOR_BUFSIZE
2201 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2202 retval
= hub_set_address(udev
);
2209 "device not accepting address %d, error %d\n",
2210 udev
->devnum
, retval
);
2214 /* cope with hardware quirkiness:
2215 * - let SET_ADDRESS settle, some device hardware wants it
2216 * - read ep0 maxpacket even for high and low speed,
2219 if (USE_NEW_SCHEME(retry_counter
))
2222 retval
= usb_get_device_descriptor(udev
, 8);
2224 dev_err(&udev
->dev
, "device descriptor "
2225 "read/%s, error %d\n",
2237 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2238 512 : udev
->descriptor
.bMaxPacketSize0
;
2239 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2240 if (udev
->speed
!= USB_SPEED_FULL
||
2241 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2242 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2246 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2247 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2251 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2252 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2253 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2264 hub_port_disable(hub
, port1
, 0);
2265 mutex_unlock(&usb_address0_mutex
);
2270 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2272 struct usb_qualifier_descriptor
*qual
;
2275 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2279 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2280 qual
, sizeof *qual
);
2281 if (status
== sizeof *qual
) {
2282 dev_info(&udev
->dev
, "not running at top speed; "
2283 "connect to a high speed hub\n");
2284 /* hub LEDs are probably harder to miss than syslog */
2285 if (hub
->has_indicators
) {
2286 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2287 schedule_delayed_work (&hub
->leds
, 0);
2294 hub_power_remaining (struct usb_hub
*hub
)
2296 struct usb_device
*hdev
= hub
->hdev
;
2300 if (!hub
->limited_power
)
2303 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2304 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2305 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2311 /* Unconfigured devices may not use more than 100mA,
2312 * or 8mA for OTG ports */
2313 if (udev
->actconfig
)
2314 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2315 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2319 if (delta
> hub
->mA_per_port
)
2320 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2322 delta
, hub
->mA_per_port
, port1
);
2325 if (remaining
< 0) {
2326 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2333 /* Handle physical or logical connection change events.
2334 * This routine is called when:
2335 * a port connection-change occurs;
2336 * a port enable-change occurs (often caused by EMI);
2337 * usb_reset_device() encounters changed descriptors (as from
2338 * a firmware download)
2339 * caller already locked the hub
2341 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2342 u16 portstatus
, u16 portchange
)
2344 struct usb_device
*hdev
= hub
->hdev
;
2345 struct device
*hub_dev
= hub
->intfdev
;
2346 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2350 "port %d, status %04x, change %04x, %s\n",
2351 port1
, portstatus
, portchange
, portspeed (portstatus
));
2353 if (hub
->has_indicators
) {
2354 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2355 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2358 /* Disconnect any existing devices under this port */
2359 if (hdev
->children
[port1
-1])
2360 usb_disconnect(&hdev
->children
[port1
-1]);
2361 clear_bit(port1
, hub
->change_bits
);
2363 #ifdef CONFIG_USB_OTG
2364 /* during HNP, don't repeat the debounce */
2365 if (hdev
->bus
->is_b_host
)
2366 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2369 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2370 status
= hub_port_debounce(hub
, port1
);
2372 if (printk_ratelimit())
2373 dev_err (hub_dev
, "connect-debounce failed, "
2374 "port %d disabled\n", port1
);
2377 portstatus
= status
;
2380 /* Return now if nothing is connected */
2381 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2383 /* maybe switch power back on (e.g. root hub was reset) */
2384 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2385 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2386 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2388 if (portstatus
& USB_PORT_STAT_ENABLE
)
2393 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2394 struct usb_device
*udev
;
2396 /* reallocate for each attempt, since references
2397 * to the previous one can escape in various ways
2399 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2402 "couldn't allocate port %d usb_device\n",
2407 usb_set_device_state(udev
, USB_STATE_POWERED
);
2408 udev
->speed
= USB_SPEED_UNKNOWN
;
2409 udev
->bus_mA
= hub
->mA_per_port
;
2410 udev
->level
= hdev
->level
+ 1;
2412 /* set the address */
2413 choose_address(udev
);
2414 if (udev
->devnum
<= 0) {
2415 status
= -ENOTCONN
; /* Don't retry */
2419 /* reset and get descriptor */
2420 status
= hub_port_init(hub
, udev
, port1
, i
);
2424 /* consecutive bus-powered hubs aren't reliable; they can
2425 * violate the voltage drop budget. if the new child has
2426 * a "powered" LED, users should notice we didn't enable it
2427 * (without reading syslog), even without per-port LEDs
2430 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2431 && udev
->bus_mA
<= 100) {
2434 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2437 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2440 le16_to_cpus(&devstat
);
2441 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2443 "can't connect bus-powered hub "
2445 if (hub
->has_indicators
) {
2446 hub
->indicator
[port1
-1] =
2447 INDICATOR_AMBER_BLINK
;
2448 schedule_delayed_work (&hub
->leds
, 0);
2450 status
= -ENOTCONN
; /* Don't retry */
2455 /* check for devices running slower than they could */
2456 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2457 && udev
->speed
== USB_SPEED_FULL
2458 && highspeed_hubs
!= 0)
2459 check_highspeed (hub
, udev
, port1
);
2461 /* Store the parent's children[] pointer. At this point
2462 * udev becomes globally accessible, although presumably
2463 * no one will look at it until hdev is unlocked.
2467 /* We mustn't add new devices if the parent hub has
2468 * been disconnected; we would race with the
2469 * recursively_mark_NOTATTACHED() routine.
2471 spin_lock_irq(&device_state_lock
);
2472 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2475 hdev
->children
[port1
-1] = udev
;
2476 spin_unlock_irq(&device_state_lock
);
2478 /* Run it through the hoops (find a driver, etc) */
2480 status
= usb_new_device(udev
);
2482 spin_lock_irq(&device_state_lock
);
2483 hdev
->children
[port1
-1] = NULL
;
2484 spin_unlock_irq(&device_state_lock
);
2491 status
= hub_power_remaining(hub
);
2493 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2498 hub_port_disable(hub
, port1
, 1);
2501 release_address(udev
);
2503 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
2508 hub_port_disable(hub
, port1
, 1);
2511 static void hub_events(void)
2513 struct list_head
*tmp
;
2514 struct usb_device
*hdev
;
2515 struct usb_interface
*intf
;
2516 struct usb_hub
*hub
;
2517 struct device
*hub_dev
;
2526 * We restart the list every time to avoid a deadlock with
2527 * deleting hubs downstream from this one. This should be
2528 * safe since we delete the hub from the event list.
2529 * Not the most efficient, but avoids deadlocks.
2533 /* Grab the first entry at the beginning of the list */
2534 spin_lock_irq(&hub_event_lock
);
2535 if (list_empty(&hub_event_list
)) {
2536 spin_unlock_irq(&hub_event_lock
);
2540 tmp
= hub_event_list
.next
;
2543 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2544 kref_get(&hub
->kref
);
2545 spin_unlock_irq(&hub_event_lock
);
2548 hub_dev
= hub
->intfdev
;
2549 intf
= to_usb_interface(hub_dev
);
2550 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2551 hdev
->state
, hub
->descriptor
2552 ? hub
->descriptor
->bNbrPorts
2554 /* NOTE: expects max 15 ports... */
2555 (u16
) hub
->change_bits
[0],
2556 (u16
) hub
->event_bits
[0]);
2558 /* Lock the device, then check to see if we were
2559 * disconnected while waiting for the lock to succeed. */
2560 usb_lock_device(hdev
);
2561 if (unlikely(hub
->disconnected
))
2564 /* If the hub has died, clean up after it */
2565 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2566 hub
->error
= -ENODEV
;
2567 hub_pre_reset(intf
);
2572 ret
= usb_autopm_get_interface(intf
);
2574 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2578 /* If this is an inactive hub, do nothing */
2583 dev_dbg (hub_dev
, "resetting for error %d\n",
2586 ret
= usb_reset_composite_device(hdev
, intf
);
2589 "error resetting hub: %d\n", ret
);
2597 /* deal with port status changes */
2598 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2599 if (test_bit(i
, hub
->busy_bits
))
2601 connect_change
= test_bit(i
, hub
->change_bits
);
2602 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2603 !connect_change
&& !hub
->activating
)
2606 ret
= hub_port_status(hub
, i
,
2607 &portstatus
, &portchange
);
2611 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2613 USB_PORT_STAT_CONNECTION
))
2616 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2617 clear_port_feature(hdev
, i
,
2618 USB_PORT_FEAT_C_CONNECTION
);
2622 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2623 if (!connect_change
)
2625 "port %d enable change, "
2628 clear_port_feature(hdev
, i
,
2629 USB_PORT_FEAT_C_ENABLE
);
2632 * EM interference sometimes causes badly
2633 * shielded USB devices to be shutdown by
2634 * the hub, this hack enables them again.
2635 * Works at least with mouse driver.
2637 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2639 && hdev
->children
[i
-1]) {
2642 "disabled by hub (EMI?), "
2649 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2650 clear_port_feature(hdev
, i
,
2651 USB_PORT_FEAT_C_SUSPEND
);
2652 if (hdev
->children
[i
-1]) {
2653 ret
= remote_wakeup(hdev
->
2659 hub_port_disable(hub
, i
, 1);
2662 "resume on port %d, status %d\n",
2666 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2668 "over-current change on port %d\n",
2670 clear_port_feature(hdev
, i
,
2671 USB_PORT_FEAT_C_OVER_CURRENT
);
2675 if (portchange
& USB_PORT_STAT_C_RESET
) {
2677 "reset change on port %d\n",
2679 clear_port_feature(hdev
, i
,
2680 USB_PORT_FEAT_C_RESET
);
2684 hub_port_connect_change(hub
, i
,
2685 portstatus
, portchange
);
2688 /* deal with hub status changes */
2689 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2691 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2692 dev_err (hub_dev
, "get_hub_status failed\n");
2694 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2695 dev_dbg (hub_dev
, "power change\n");
2696 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2697 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2698 /* FIXME: Is this always true? */
2699 hub
->limited_power
= 0;
2701 hub
->limited_power
= 1;
2703 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2704 dev_dbg (hub_dev
, "overcurrent change\n");
2705 msleep(500); /* Cool down */
2706 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2711 hub
->activating
= 0;
2713 /* If this is a root hub, tell the HCD it's okay to
2714 * re-enable port-change interrupts now. */
2715 if (!hdev
->parent
&& !hub
->busy_bits
[0])
2716 usb_enable_root_hub_irq(hdev
->bus
);
2719 /* Allow autosuspend if we're not going to run again */
2720 if (list_empty(&hub
->event_list
))
2721 usb_autopm_enable(intf
);
2723 usb_unlock_device(hdev
);
2724 kref_put(&hub
->kref
, hub_release
);
2726 } /* end while (1) */
2729 static int hub_thread(void *__unused
)
2733 wait_event_interruptible(khubd_wait
,
2734 !list_empty(&hub_event_list
) ||
2735 kthread_should_stop());
2737 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2739 pr_debug("%s: khubd exiting\n", usbcore_name
);
2743 static struct usb_device_id hub_id_table
[] = {
2744 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2745 .bDeviceClass
= USB_CLASS_HUB
},
2746 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2747 .bInterfaceClass
= USB_CLASS_HUB
},
2748 { } /* Terminating entry */
2751 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2753 static struct usb_driver hub_driver
= {
2756 .disconnect
= hub_disconnect
,
2757 .suspend
= hub_suspend
,
2758 .resume
= hub_resume
,
2759 .reset_resume
= hub_reset_resume
,
2760 .pre_reset
= hub_pre_reset
,
2761 .post_reset
= hub_post_reset
,
2763 .id_table
= hub_id_table
,
2764 .supports_autosuspend
= 1,
2767 int usb_hub_init(void)
2769 if (usb_register(&hub_driver
) < 0) {
2770 printk(KERN_ERR
"%s: can't register hub driver\n",
2775 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2776 if (!IS_ERR(khubd_task
))
2779 /* Fall through if kernel_thread failed */
2780 usb_deregister(&hub_driver
);
2781 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2786 void usb_hub_cleanup(void)
2788 kthread_stop(khubd_task
);
2791 * Hub resources are freed for us by usb_deregister. It calls
2792 * usb_driver_purge on every device which in turn calls that
2793 * devices disconnect function if it is using this driver.
2794 * The hub_disconnect function takes care of releasing the
2795 * individual hub resources. -greg
2797 usb_deregister(&hub_driver
);
2798 } /* usb_hub_cleanup() */
2800 static int config_descriptors_changed(struct usb_device
*udev
)
2804 struct usb_config_descriptor
*buf
;
2806 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2807 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2808 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2810 buf
= kmalloc (len
, GFP_KERNEL
);
2812 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2813 /* assume the worst */
2816 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2818 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2820 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
2822 if (length
< old_length
) {
2823 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
2827 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
2829 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
2830 index
, buf
->bConfigurationValue
);
2835 return index
!= udev
->descriptor
.bNumConfigurations
;
2839 * usb_reset_device - perform a USB port reset to reinitialize a device
2840 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2842 * WARNING - don't use this routine to reset a composite device
2843 * (one with multiple interfaces owned by separate drivers)!
2844 * Use usb_reset_composite_device() instead.
2846 * Do a port reset, reassign the device's address, and establish its
2847 * former operating configuration. If the reset fails, or the device's
2848 * descriptors change from their values before the reset, or the original
2849 * configuration and altsettings cannot be restored, a flag will be set
2850 * telling khubd to pretend the device has been disconnected and then
2851 * re-connected. All drivers will be unbound, and the device will be
2852 * re-enumerated and probed all over again.
2854 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2855 * flagged for logical disconnection, or some other negative error code
2856 * if the reset wasn't even attempted.
2858 * The caller must own the device lock. For example, it's safe to use
2859 * this from a driver probe() routine after downloading new firmware.
2860 * For calls that might not occur during probe(), drivers should lock
2861 * the device using usb_lock_device_for_reset().
2863 * Locking exception: This routine may also be called from within an
2864 * autoresume handler. Such usage won't conflict with other tasks
2865 * holding the device lock because these tasks should always call
2866 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
2868 int usb_reset_device(struct usb_device
*udev
)
2870 struct usb_device
*parent_hdev
= udev
->parent
;
2871 struct usb_hub
*parent_hub
;
2872 struct usb_device_descriptor descriptor
= udev
->descriptor
;
2874 int port1
= udev
->portnum
;
2876 if (udev
->state
== USB_STATE_NOTATTACHED
||
2877 udev
->state
== USB_STATE_SUSPENDED
) {
2878 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
2884 /* this requires hcd-specific logic; see OHCI hc_restart() */
2885 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
2888 parent_hub
= hdev_to_hub(parent_hdev
);
2890 set_bit(port1
, parent_hub
->busy_bits
);
2891 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
2893 /* ep0 maxpacket size may change; let the HCD know about it.
2894 * Other endpoints will be handled by re-enumeration. */
2896 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
2897 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
2900 clear_bit(port1
, parent_hub
->busy_bits
);
2901 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
2902 usb_enable_root_hub_irq(parent_hdev
->bus
);
2907 /* Device might have changed firmware (DFU or similar) */
2908 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
2909 || config_descriptors_changed (udev
)) {
2910 dev_info(&udev
->dev
, "device firmware changed\n");
2911 udev
->descriptor
= descriptor
; /* for disconnect() calls */
2915 if (!udev
->actconfig
)
2918 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2919 USB_REQ_SET_CONFIGURATION
, 0,
2920 udev
->actconfig
->desc
.bConfigurationValue
, 0,
2921 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2924 "can't restore configuration #%d (error=%d)\n",
2925 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
2928 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
2930 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
2931 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
2932 struct usb_interface_descriptor
*desc
;
2934 /* set_interface resets host side toggle even
2935 * for altsetting zero. the interface may have no driver.
2937 desc
= &intf
->cur_altsetting
->desc
;
2938 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
2939 desc
->bAlternateSetting
);
2941 dev_err(&udev
->dev
, "failed to restore interface %d "
2942 "altsetting %d (error=%d)\n",
2943 desc
->bInterfaceNumber
,
2944 desc
->bAlternateSetting
,
2954 hub_port_logical_disconnect(parent_hub
, port1
);
2957 EXPORT_SYMBOL(usb_reset_device
);
2960 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
2961 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2962 * @iface: interface bound to the driver making the request (optional)
2964 * Warns all drivers bound to registered interfaces (using their pre_reset
2965 * method), performs the port reset, and then lets the drivers know that
2966 * the reset is over (using their post_reset method).
2968 * Return value is the same as for usb_reset_device().
2970 * The caller must own the device lock. For example, it's safe to use
2971 * this from a driver probe() routine after downloading new firmware.
2972 * For calls that might not occur during probe(), drivers should lock
2973 * the device using usb_lock_device_for_reset().
2975 * The interface locks are acquired during the pre_reset stage and released
2976 * during the post_reset stage. However if iface is not NULL and is
2977 * currently being probed, we assume that the caller already owns its
2980 int usb_reset_composite_device(struct usb_device
*udev
,
2981 struct usb_interface
*iface
)
2984 struct usb_host_config
*config
= udev
->actconfig
;
2986 if (udev
->state
== USB_STATE_NOTATTACHED
||
2987 udev
->state
== USB_STATE_SUSPENDED
) {
2988 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
2993 /* Prevent autosuspend during the reset */
2994 usb_autoresume_device(udev
);
2996 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3001 struct usb_interface
*cintf
;
3002 struct usb_driver
*drv
;
3004 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3005 cintf
= config
->interface
[i
];
3007 down(&cintf
->dev
.sem
);
3008 if (device_is_registered(&cintf
->dev
) &&
3009 cintf
->dev
.driver
) {
3010 drv
= to_usb_driver(cintf
->dev
.driver
);
3012 (drv
->pre_reset
)(cintf
);
3013 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
3018 ret
= usb_reset_device(udev
);
3022 struct usb_interface
*cintf
;
3023 struct usb_driver
*drv
;
3025 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3026 cintf
= config
->interface
[i
];
3027 if (device_is_registered(&cintf
->dev
) &&
3028 cintf
->dev
.driver
) {
3029 drv
= to_usb_driver(cintf
->dev
.driver
);
3030 if (drv
->post_reset
)
3031 (drv
->post_reset
)(cintf
);
3032 /* FIXME: Unbind if post_reset returns an error or isn't defined */
3035 up(&cintf
->dev
.sem
);
3039 usb_autosuspend_device(udev
);
3042 EXPORT_SYMBOL(usb_reset_composite_device
);