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/usb/quirks.h>
23 #include <linux/kthread.h>
24 #include <linux/mutex.h>
25 #include <linux/freezer.h>
27 #include <asm/semaphore.h>
28 #include <asm/uaccess.h>
29 #include <asm/byteorder.h>
35 /* if we are in debug mode, always announce new devices */
37 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
38 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
43 struct device
*intfdev
; /* the "interface" device */
44 struct usb_device
*hdev
;
46 struct urb
*urb
; /* for interrupt polling pipe */
48 /* buffer for urb ... with extra space in case of babble */
51 struct usb_hub_status hub
;
52 struct usb_port_status port
;
53 } *status
; /* buffer for status reports */
54 struct mutex status_mutex
; /* for the status buffer */
56 int error
; /* last reported error */
57 int nerrors
; /* track consecutive errors */
59 struct list_head event_list
; /* hubs w/data or errs ready */
60 unsigned long event_bits
[1]; /* status change bitmask */
61 unsigned long change_bits
[1]; /* ports with logical connect
63 unsigned long busy_bits
[1]; /* ports being reset or
65 unsigned long removed_bits
[1]; /* ports with a "removed"
67 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
68 #error event_bits[] is too short!
71 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
72 struct usb_tt tt
; /* Transaction Translator */
74 unsigned mA_per_port
; /* current for each child */
76 unsigned limited_power
:1;
78 unsigned disconnected
:1;
80 unsigned has_indicators
:1;
81 u8 indicator
[USB_MAXCHILDREN
];
82 struct delayed_work leds
;
83 struct delayed_work init_work
;
87 /* Protect struct usb_device->state and ->children members
88 * Note: Both are also protected by ->dev.sem, except that ->state can
89 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
90 static DEFINE_SPINLOCK(device_state_lock
);
92 /* khubd's worklist and its lock */
93 static DEFINE_SPINLOCK(hub_event_lock
);
94 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
97 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
99 static struct task_struct
*khubd_task
;
101 /* cycle leds on hubs that aren't blinking for attention */
102 static int blinkenlights
= 0;
103 module_param (blinkenlights
, bool, S_IRUGO
);
104 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
107 * As of 2.6.10 we introduce a new USB device initialization scheme which
108 * closely resembles the way Windows works. Hopefully it will be compatible
109 * with a wider range of devices than the old scheme. However some previously
110 * working devices may start giving rise to "device not accepting address"
111 * errors; if that happens the user can try the old scheme by adjusting the
112 * following module parameters.
114 * For maximum flexibility there are two boolean parameters to control the
115 * hub driver's behavior. On the first initialization attempt, if the
116 * "old_scheme_first" parameter is set then the old scheme will be used,
117 * otherwise the new scheme is used. If that fails and "use_both_schemes"
118 * is set, then the driver will make another attempt, using the other scheme.
120 static int old_scheme_first
= 1;
121 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
122 MODULE_PARM_DESC(old_scheme_first
,
123 "start with the old device initialization scheme");
125 static int use_both_schemes
= 1;
126 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
127 MODULE_PARM_DESC(use_both_schemes
,
128 "try the other device initialization scheme if the "
131 /* Mutual exclusion for EHCI CF initialization. This interferes with
132 * port reset on some companion controllers.
134 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
135 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
137 #define HUB_DEBOUNCE_TIMEOUT 1500
138 #define HUB_DEBOUNCE_STEP 25
139 #define HUB_DEBOUNCE_STABLE 100
142 static int usb_reset_and_verify_device(struct usb_device
*udev
);
144 static inline char *portspeed(int portstatus
)
146 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
148 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
154 /* Note that hdev or one of its children must be locked! */
155 static struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
157 if (!hdev
|| !hdev
->actconfig
)
159 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
162 /* USB 2.0 spec Section 11.24.4.5 */
163 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
167 for (i
= 0; i
< 3; i
++) {
168 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
169 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
170 USB_DT_HUB
<< 8, 0, data
, size
,
171 USB_CTRL_GET_TIMEOUT
);
172 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
179 * USB 2.0 spec Section 11.24.2.1
181 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
183 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
184 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
188 * USB 2.0 spec Section 11.24.2.2
190 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
192 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
193 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
198 * USB 2.0 spec Section 11.24.2.13
200 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
202 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
203 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
208 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
209 * for info about using port indicators
211 static void set_port_led(
217 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
218 USB_PORT_FEAT_INDICATOR
);
220 dev_dbg (hub
->intfdev
,
221 "port %d indicator %s status %d\n",
223 ({ char *s
; switch (selector
) {
224 case HUB_LED_AMBER
: s
= "amber"; break;
225 case HUB_LED_GREEN
: s
= "green"; break;
226 case HUB_LED_OFF
: s
= "off"; break;
227 case HUB_LED_AUTO
: s
= "auto"; break;
228 default: s
= "??"; break;
233 #define LED_CYCLE_PERIOD ((2*HZ)/3)
235 static void led_work (struct work_struct
*work
)
237 struct usb_hub
*hub
=
238 container_of(work
, struct usb_hub
, leds
.work
);
239 struct usb_device
*hdev
= hub
->hdev
;
241 unsigned changed
= 0;
244 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
247 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
248 unsigned selector
, mode
;
250 /* 30%-50% duty cycle */
252 switch (hub
->indicator
[i
]) {
254 case INDICATOR_CYCLE
:
256 selector
= HUB_LED_AUTO
;
257 mode
= INDICATOR_AUTO
;
259 /* blinking green = sw attention */
260 case INDICATOR_GREEN_BLINK
:
261 selector
= HUB_LED_GREEN
;
262 mode
= INDICATOR_GREEN_BLINK_OFF
;
264 case INDICATOR_GREEN_BLINK_OFF
:
265 selector
= HUB_LED_OFF
;
266 mode
= INDICATOR_GREEN_BLINK
;
268 /* blinking amber = hw attention */
269 case INDICATOR_AMBER_BLINK
:
270 selector
= HUB_LED_AMBER
;
271 mode
= INDICATOR_AMBER_BLINK_OFF
;
273 case INDICATOR_AMBER_BLINK_OFF
:
274 selector
= HUB_LED_OFF
;
275 mode
= INDICATOR_AMBER_BLINK
;
277 /* blink green/amber = reserved */
278 case INDICATOR_ALT_BLINK
:
279 selector
= HUB_LED_GREEN
;
280 mode
= INDICATOR_ALT_BLINK_OFF
;
282 case INDICATOR_ALT_BLINK_OFF
:
283 selector
= HUB_LED_AMBER
;
284 mode
= INDICATOR_ALT_BLINK
;
289 if (selector
!= HUB_LED_AUTO
)
291 set_port_led(hub
, i
+ 1, selector
);
292 hub
->indicator
[i
] = mode
;
294 if (!changed
&& blinkenlights
) {
296 cursor
%= hub
->descriptor
->bNbrPorts
;
297 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
298 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
302 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
305 /* use a short timeout for hub/port status fetches */
306 #define USB_STS_TIMEOUT 1000
307 #define USB_STS_RETRIES 5
310 * USB 2.0 spec Section 11.24.2.6
312 static int get_hub_status(struct usb_device
*hdev
,
313 struct usb_hub_status
*data
)
315 int i
, status
= -ETIMEDOUT
;
317 for (i
= 0; i
< USB_STS_RETRIES
&&
318 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
319 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
320 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
321 data
, sizeof(*data
), USB_STS_TIMEOUT
);
327 * USB 2.0 spec Section 11.24.2.7
329 static int get_port_status(struct usb_device
*hdev
, int port1
,
330 struct usb_port_status
*data
)
332 int i
, status
= -ETIMEDOUT
;
334 for (i
= 0; i
< USB_STS_RETRIES
&&
335 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
336 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
337 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
338 data
, sizeof(*data
), USB_STS_TIMEOUT
);
343 static int hub_port_status(struct usb_hub
*hub
, int port1
,
344 u16
*status
, u16
*change
)
348 mutex_lock(&hub
->status_mutex
);
349 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
351 dev_err(hub
->intfdev
,
352 "%s failed (err = %d)\n", __func__
, ret
);
356 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
357 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
360 mutex_unlock(&hub
->status_mutex
);
364 static void kick_khubd(struct usb_hub
*hub
)
368 /* Suppress autosuspend until khubd runs */
369 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
371 spin_lock_irqsave(&hub_event_lock
, flags
);
372 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
373 list_add_tail(&hub
->event_list
, &hub_event_list
);
374 wake_up(&khubd_wait
);
376 spin_unlock_irqrestore(&hub_event_lock
, flags
);
379 void usb_kick_khubd(struct usb_device
*hdev
)
381 struct usb_hub
*hub
= hdev_to_hub(hdev
);
388 /* completion function, fires on port status changes and various faults */
389 static void hub_irq(struct urb
*urb
)
391 struct usb_hub
*hub
= urb
->context
;
392 int status
= urb
->status
;
397 case -ENOENT
: /* synchronous unlink */
398 case -ECONNRESET
: /* async unlink */
399 case -ESHUTDOWN
: /* hardware going away */
402 default: /* presumably an error */
403 /* Cause a hub reset after 10 consecutive errors */
404 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
405 if ((++hub
->nerrors
< 10) || hub
->error
)
410 /* let khubd handle things */
411 case 0: /* we got data: port status changed */
413 for (i
= 0; i
< urb
->actual_length
; ++i
)
414 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
416 hub
->event_bits
[0] = bits
;
422 /* Something happened, let khubd figure it out */
429 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
430 && status
!= -ENODEV
&& status
!= -EPERM
)
431 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
434 /* USB 2.0 spec Section 11.24.2.3 */
436 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
438 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
439 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
444 * enumeration blocks khubd for a long time. we use keventd instead, since
445 * long blocking there is the exception, not the rule. accordingly, HCDs
446 * talking to TTs must queue control transfers (not just bulk and iso), so
447 * both can talk to the same hub concurrently.
449 static void hub_tt_kevent (struct work_struct
*work
)
451 struct usb_hub
*hub
=
452 container_of(work
, struct usb_hub
, tt
.kevent
);
456 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
457 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
458 struct list_head
*temp
;
459 struct usb_tt_clear
*clear
;
460 struct usb_device
*hdev
= hub
->hdev
;
463 temp
= hub
->tt
.clear_list
.next
;
464 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
465 list_del (&clear
->clear_list
);
467 /* drop lock so HCD can concurrently report other TT errors */
468 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
469 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
470 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
474 "clear tt %d (%04x) error %d\n",
475 clear
->tt
, clear
->devinfo
, status
);
478 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
482 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
483 * @udev: the device whose split transaction failed
484 * @pipe: identifies the endpoint of the failed transaction
486 * High speed HCDs use this to tell the hub driver that some split control or
487 * bulk transaction failed in a way that requires clearing internal state of
488 * a transaction translator. This is normally detected (and reported) from
491 * It may not be possible for that hub to handle additional full (or low)
492 * speed transactions until that state is fully cleared out.
494 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
496 struct usb_tt
*tt
= udev
->tt
;
498 struct usb_tt_clear
*clear
;
500 /* we've got to cope with an arbitrary number of pending TT clears,
501 * since each TT has "at least two" buffers that can need it (and
502 * there can be many TTs per hub). even if they're uncommon.
504 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
505 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
506 /* FIXME recover somehow ... RESET_TT? */
510 /* info that CLEAR_TT_BUFFER needs */
511 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
512 clear
->devinfo
= usb_pipeendpoint (pipe
);
513 clear
->devinfo
|= udev
->devnum
<< 4;
514 clear
->devinfo
|= usb_pipecontrol (pipe
)
515 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
516 : (USB_ENDPOINT_XFER_BULK
<< 11);
517 if (usb_pipein (pipe
))
518 clear
->devinfo
|= 1 << 15;
520 /* tell keventd to clear state for this TT */
521 spin_lock_irqsave (&tt
->lock
, flags
);
522 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
523 schedule_work (&tt
->kevent
);
524 spin_unlock_irqrestore (&tt
->lock
, flags
);
526 EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer
);
528 /* If do_delay is false, return the number of milliseconds the caller
531 static unsigned hub_power_on(struct usb_hub
*hub
, bool do_delay
)
534 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
536 u16 wHubCharacteristics
=
537 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
539 /* Enable power on each port. Some hubs have reserved values
540 * of LPSM (> 2) in their descriptors, even though they are
541 * USB 2.0 hubs. Some hubs do not implement port-power switching
542 * but only emulate it. In all cases, the ports won't work
543 * unless we send these messages to the hub.
545 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
546 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
548 dev_dbg(hub
->intfdev
, "trying to enable port power on "
549 "non-switchable hub\n");
550 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
551 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
553 /* Wait at least 100 msec for power to become stable */
554 delay
= max(pgood_delay
, (unsigned) 100);
560 static int hub_hub_status(struct usb_hub
*hub
,
561 u16
*status
, u16
*change
)
565 mutex_lock(&hub
->status_mutex
);
566 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
568 dev_err (hub
->intfdev
,
569 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
571 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
572 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
575 mutex_unlock(&hub
->status_mutex
);
579 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
581 struct usb_device
*hdev
= hub
->hdev
;
584 if (hdev
->children
[port1
-1] && set_state
)
585 usb_set_device_state(hdev
->children
[port1
-1],
586 USB_STATE_NOTATTACHED
);
588 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
590 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
596 * Disable a port and mark a logical connnect-change event, so that some
597 * time later khubd will disconnect() any existing usb_device on the port
598 * and will re-enumerate if there actually is a device attached.
600 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
602 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
603 hub_port_disable(hub
, port1
, 1);
605 /* FIXME let caller ask to power down the port:
606 * - some devices won't enumerate without a VBUS power cycle
607 * - SRP saves power that way
608 * - ... new call, TBD ...
609 * That's easy if this hub can switch power per-port, and
610 * khubd reactivates the port later (timer, SRP, etc).
611 * Powerdown must be optional, because of reset/DFU.
614 set_bit(port1
, hub
->change_bits
);
619 * usb_remove_device - disable a device's port on its parent hub
620 * @udev: device to be disabled and removed
621 * Context: @udev locked, must be able to sleep.
623 * After @udev's port has been disabled, khubd is notified and it will
624 * see that the device has been disconnected. When the device is
625 * physically unplugged and something is plugged in, the events will
626 * be received and processed normally.
628 int usb_remove_device(struct usb_device
*udev
)
631 struct usb_interface
*intf
;
633 if (!udev
->parent
) /* Can't remove a root hub */
635 hub
= hdev_to_hub(udev
->parent
);
636 intf
= to_usb_interface(hub
->intfdev
);
638 usb_autopm_get_interface(intf
);
639 set_bit(udev
->portnum
, hub
->removed_bits
);
640 hub_port_logical_disconnect(hub
, udev
->portnum
);
641 usb_autopm_put_interface(intf
);
645 enum hub_activation_type
{
646 HUB_INIT
, HUB_INIT2
, HUB_INIT3
,
647 HUB_POST_RESET
, HUB_RESUME
, HUB_RESET_RESUME
,
650 static void hub_init_func2(struct work_struct
*ws
);
651 static void hub_init_func3(struct work_struct
*ws
);
653 static void hub_activate(struct usb_hub
*hub
, enum hub_activation_type type
)
655 struct usb_device
*hdev
= hub
->hdev
;
658 bool need_debounce_delay
= false;
661 /* Continue a partial initialization */
662 if (type
== HUB_INIT2
)
664 if (type
== HUB_INIT3
)
667 /* After a resume, port power should still be on.
668 * For any other type of activation, turn it on.
670 if (type
!= HUB_RESUME
) {
672 /* Speed up system boot by using a delayed_work for the
673 * hub's initial power-up delays. This is pretty awkward
674 * and the implementation looks like a home-brewed sort of
675 * setjmp/longjmp, but it saves at least 100 ms for each
676 * root hub (assuming usbcore is compiled into the kernel
677 * rather than as a module). It adds up.
679 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
680 * because for those activation types the ports have to be
681 * operational when we return. In theory this could be done
682 * for HUB_POST_RESET, but it's easier not to.
684 if (type
== HUB_INIT
) {
685 delay
= hub_power_on(hub
, false);
686 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func2
);
687 schedule_delayed_work(&hub
->init_work
,
688 msecs_to_jiffies(delay
));
690 /* Suppress autosuspend until init is done */
691 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
692 return; /* Continues at init2: below */
694 hub_power_on(hub
, true);
699 /* Check each port and set hub->change_bits to let khubd know
700 * which ports need attention.
702 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
703 struct usb_device
*udev
= hdev
->children
[port1
-1];
704 u16 portstatus
, portchange
;
706 portstatus
= portchange
= 0;
707 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
708 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
709 dev_dbg(hub
->intfdev
,
710 "port %d: status %04x change %04x\n",
711 port1
, portstatus
, portchange
);
713 /* After anything other than HUB_RESUME (i.e., initialization
714 * or any sort of reset), every port should be disabled.
715 * Unconnected ports should likewise be disabled (paranoia),
716 * and so should ports for which we have no usb_device.
718 if ((portstatus
& USB_PORT_STAT_ENABLE
) && (
719 type
!= HUB_RESUME
||
720 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
722 udev
->state
== USB_STATE_NOTATTACHED
)) {
723 clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
724 portstatus
&= ~USB_PORT_STAT_ENABLE
;
727 /* Clear status-change flags; we'll debounce later */
728 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
729 need_debounce_delay
= true;
730 clear_port_feature(hub
->hdev
, port1
,
731 USB_PORT_FEAT_C_CONNECTION
);
733 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
734 need_debounce_delay
= true;
735 clear_port_feature(hub
->hdev
, port1
,
736 USB_PORT_FEAT_C_ENABLE
);
739 /* We can forget about a "removed" device when there's a
740 * physical disconnect or the connect status changes.
742 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
743 (portchange
& USB_PORT_STAT_C_CONNECTION
))
744 clear_bit(port1
, hub
->removed_bits
);
746 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
747 /* Tell khubd to disconnect the device or
748 * check for a new connection
750 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
751 set_bit(port1
, hub
->change_bits
);
753 } else if (portstatus
& USB_PORT_STAT_ENABLE
) {
754 /* The power session apparently survived the resume.
755 * If there was an overcurrent or suspend change
756 * (i.e., remote wakeup request), have khubd
760 set_bit(port1
, hub
->change_bits
);
762 } else if (udev
->persist_enabled
) {
764 udev
->reset_resume
= 1;
766 set_bit(port1
, hub
->change_bits
);
769 /* The power session is gone; tell khubd */
770 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
771 set_bit(port1
, hub
->change_bits
);
775 /* If no port-status-change flags were set, we don't need any
776 * debouncing. If flags were set we can try to debounce the
777 * ports all at once right now, instead of letting khubd do them
778 * one at a time later on.
780 * If any port-status changes do occur during this delay, khubd
781 * will see them later and handle them normally.
783 if (need_debounce_delay
) {
784 delay
= HUB_DEBOUNCE_STABLE
;
786 /* Don't do a long sleep inside a workqueue routine */
787 if (type
== HUB_INIT2
) {
788 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func3
);
789 schedule_delayed_work(&hub
->init_work
,
790 msecs_to_jiffies(delay
));
791 return; /* Continues at init3: below */
799 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
801 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
802 if (hub
->has_indicators
&& blinkenlights
)
803 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
805 /* Scan all ports that need attention */
809 /* Implement the continuations for the delays above */
810 static void hub_init_func2(struct work_struct
*ws
)
812 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
814 hub_activate(hub
, HUB_INIT2
);
817 static void hub_init_func3(struct work_struct
*ws
)
819 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
821 hub_activate(hub
, HUB_INIT3
);
824 enum hub_quiescing_type
{
825 HUB_DISCONNECT
, HUB_PRE_RESET
, HUB_SUSPEND
828 static void hub_quiesce(struct usb_hub
*hub
, enum hub_quiescing_type type
)
830 struct usb_device
*hdev
= hub
->hdev
;
833 cancel_rearming_delayed_work(&hub
->init_work
);
835 /* khubd and related activity won't re-trigger */
838 if (type
!= HUB_SUSPEND
) {
839 /* Disconnect all the children */
840 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
841 if (hdev
->children
[i
])
842 usb_disconnect(&hdev
->children
[i
]);
846 /* Stop khubd and related activity */
847 usb_kill_urb(hub
->urb
);
848 if (hub
->has_indicators
)
849 cancel_rearming_delayed_work(&hub
->leds
);
851 cancel_work_sync(&hub
->tt
.kevent
);
854 /* caller has locked the hub device */
855 static int hub_pre_reset(struct usb_interface
*intf
)
857 struct usb_hub
*hub
= usb_get_intfdata(intf
);
859 hub_quiesce(hub
, HUB_PRE_RESET
);
863 /* caller has locked the hub device */
864 static int hub_post_reset(struct usb_interface
*intf
)
866 struct usb_hub
*hub
= usb_get_intfdata(intf
);
868 hub_activate(hub
, HUB_POST_RESET
);
872 static int hub_configure(struct usb_hub
*hub
,
873 struct usb_endpoint_descriptor
*endpoint
)
875 struct usb_device
*hdev
= hub
->hdev
;
876 struct device
*hub_dev
= hub
->intfdev
;
877 u16 hubstatus
, hubchange
;
878 u16 wHubCharacteristics
;
883 hub
->buffer
= kmalloc(sizeof(*hub
->buffer
), GFP_KERNEL
);
885 message
= "can't allocate hub irq buffer";
890 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
892 message
= "can't kmalloc hub status buffer";
896 mutex_init(&hub
->status_mutex
);
898 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
899 if (!hub
->descriptor
) {
900 message
= "can't kmalloc hub descriptor";
905 /* Request the entire hub descriptor.
906 * hub->descriptor can handle USB_MAXCHILDREN ports,
907 * but the hub can/will return fewer bytes here.
909 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
910 sizeof(*hub
->descriptor
));
912 message
= "can't read hub descriptor";
914 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
915 message
= "hub has too many ports!";
920 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
921 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
922 (hdev
->maxchild
== 1) ? "" : "s");
924 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
926 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
928 char portstr
[USB_MAXCHILDREN
+ 1];
930 for (i
= 0; i
< hdev
->maxchild
; i
++)
931 portstr
[i
] = hub
->descriptor
->DeviceRemovable
932 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
934 portstr
[hdev
->maxchild
] = 0;
935 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
937 dev_dbg(hub_dev
, "standalone hub\n");
939 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
941 dev_dbg(hub_dev
, "ganged power switching\n");
944 dev_dbg(hub_dev
, "individual port power switching\n");
948 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
952 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
954 dev_dbg(hub_dev
, "global over-current protection\n");
957 dev_dbg(hub_dev
, "individual port over-current protection\n");
961 dev_dbg(hub_dev
, "no over-current protection\n");
965 spin_lock_init (&hub
->tt
.lock
);
966 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
967 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
);
968 switch (hdev
->descriptor
.bDeviceProtocol
) {
972 dev_dbg(hub_dev
, "Single TT\n");
976 ret
= usb_set_interface(hdev
, 0, 1);
978 dev_dbg(hub_dev
, "TT per port\n");
981 dev_err(hub_dev
, "Using single TT (err %d)\n",
986 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
987 hdev
->descriptor
.bDeviceProtocol
);
991 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
992 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
993 case HUB_TTTT_8_BITS
:
994 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
995 hub
->tt
.think_time
= 666;
996 dev_dbg(hub_dev
, "TT requires at most %d "
997 "FS bit times (%d ns)\n",
998 8, hub
->tt
.think_time
);
1001 case HUB_TTTT_16_BITS
:
1002 hub
->tt
.think_time
= 666 * 2;
1003 dev_dbg(hub_dev
, "TT requires at most %d "
1004 "FS bit times (%d ns)\n",
1005 16, hub
->tt
.think_time
);
1007 case HUB_TTTT_24_BITS
:
1008 hub
->tt
.think_time
= 666 * 3;
1009 dev_dbg(hub_dev
, "TT requires at most %d "
1010 "FS bit times (%d ns)\n",
1011 24, hub
->tt
.think_time
);
1013 case HUB_TTTT_32_BITS
:
1014 hub
->tt
.think_time
= 666 * 4;
1015 dev_dbg(hub_dev
, "TT requires at most %d "
1016 "FS bit times (%d ns)\n",
1017 32, hub
->tt
.think_time
);
1021 /* probe() zeroes hub->indicator[] */
1022 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
1023 hub
->has_indicators
= 1;
1024 dev_dbg(hub_dev
, "Port indicators are supported\n");
1027 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
1028 hub
->descriptor
->bPwrOn2PwrGood
* 2);
1030 /* power budgeting mostly matters with bus-powered hubs,
1031 * and battery-powered root hubs (may provide just 8 mA).
1033 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
1035 message
= "can't get hub status";
1038 le16_to_cpus(&hubstatus
);
1039 if (hdev
== hdev
->bus
->root_hub
) {
1040 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
1041 hub
->mA_per_port
= 500;
1043 hub
->mA_per_port
= hdev
->bus_mA
;
1044 hub
->limited_power
= 1;
1046 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
1047 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
1048 hub
->descriptor
->bHubContrCurrent
);
1049 hub
->limited_power
= 1;
1050 if (hdev
->maxchild
> 0) {
1051 int remaining
= hdev
->bus_mA
-
1052 hub
->descriptor
->bHubContrCurrent
;
1054 if (remaining
< hdev
->maxchild
* 100)
1056 "insufficient power available "
1057 "to use all downstream ports\n");
1058 hub
->mA_per_port
= 100; /* 7.2.1.1 */
1060 } else { /* Self-powered external hub */
1061 /* FIXME: What about battery-powered external hubs that
1062 * provide less current per port? */
1063 hub
->mA_per_port
= 500;
1065 if (hub
->mA_per_port
< 500)
1066 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
1069 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
1071 message
= "can't get hub status";
1075 /* local power status reports aren't always correct */
1076 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
1077 dev_dbg(hub_dev
, "local power source is %s\n",
1078 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
1079 ? "lost (inactive)" : "good");
1081 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
1082 dev_dbg(hub_dev
, "%sover-current condition exists\n",
1083 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
1085 /* set up the interrupt endpoint
1086 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1087 * bytes as USB2.0[11.12.3] says because some hubs are known
1088 * to send more data (and thus cause overflow). For root hubs,
1089 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1090 * to be big enough for at least USB_MAXCHILDREN ports. */
1091 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
1092 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
1094 if (maxp
> sizeof(*hub
->buffer
))
1095 maxp
= sizeof(*hub
->buffer
);
1097 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
1099 message
= "couldn't allocate interrupt urb";
1104 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
1105 hub
, endpoint
->bInterval
);
1107 /* maybe cycle the hub leds */
1108 if (hub
->has_indicators
&& blinkenlights
)
1109 hub
->indicator
[0] = INDICATOR_CYCLE
;
1111 hub_activate(hub
, HUB_INIT
);
1115 dev_err (hub_dev
, "config failed, %s (err %d)\n",
1117 /* hub_disconnect() frees urb and descriptor */
1121 static void hub_release(struct kref
*kref
)
1123 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1125 usb_put_intf(to_usb_interface(hub
->intfdev
));
1129 static unsigned highspeed_hubs
;
1131 static void hub_disconnect(struct usb_interface
*intf
)
1133 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1135 /* Take the hub off the event list and don't let it be added again */
1136 spin_lock_irq(&hub_event_lock
);
1137 list_del_init(&hub
->event_list
);
1138 hub
->disconnected
= 1;
1139 spin_unlock_irq(&hub_event_lock
);
1141 /* Disconnect all children and quiesce the hub */
1143 hub_quiesce(hub
, HUB_DISCONNECT
);
1145 usb_set_intfdata (intf
, NULL
);
1147 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1150 usb_free_urb(hub
->urb
);
1151 kfree(hub
->descriptor
);
1155 kref_put(&hub
->kref
, hub_release
);
1158 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1160 struct usb_host_interface
*desc
;
1161 struct usb_endpoint_descriptor
*endpoint
;
1162 struct usb_device
*hdev
;
1163 struct usb_hub
*hub
;
1165 desc
= intf
->cur_altsetting
;
1166 hdev
= interface_to_usbdev(intf
);
1168 if (hdev
->level
== MAX_TOPO_LEVEL
) {
1170 "Unsupported bus topology: hub nested too deep\n");
1174 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1176 dev_warn(&intf
->dev
, "ignoring external hub\n");
1181 /* Some hubs have a subclass of 1, which AFAICT according to the */
1182 /* specs is not defined, but it works */
1183 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1184 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1186 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
1190 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1191 if (desc
->desc
.bNumEndpoints
!= 1)
1192 goto descriptor_error
;
1194 endpoint
= &desc
->endpoint
[0].desc
;
1196 /* If it's not an interrupt in endpoint, we'd better punt! */
1197 if (!usb_endpoint_is_int_in(endpoint
))
1198 goto descriptor_error
;
1200 /* We found a hub */
1201 dev_info (&intf
->dev
, "USB hub found\n");
1203 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1205 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1209 kref_init(&hub
->kref
);
1210 INIT_LIST_HEAD(&hub
->event_list
);
1211 hub
->intfdev
= &intf
->dev
;
1213 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1214 INIT_DELAYED_WORK(&hub
->init_work
, NULL
);
1217 usb_set_intfdata (intf
, hub
);
1218 intf
->needs_remote_wakeup
= 1;
1220 if (hdev
->speed
== USB_SPEED_HIGH
)
1223 if (hub_configure(hub
, endpoint
) >= 0)
1226 hub_disconnect (intf
);
1231 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1233 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1235 /* assert ifno == 0 (part of hub spec) */
1237 case USBDEVFS_HUB_PORTINFO
: {
1238 struct usbdevfs_hub_portinfo
*info
= user_data
;
1241 spin_lock_irq(&device_state_lock
);
1242 if (hdev
->devnum
<= 0)
1245 info
->nports
= hdev
->maxchild
;
1246 for (i
= 0; i
< info
->nports
; i
++) {
1247 if (hdev
->children
[i
] == NULL
)
1251 hdev
->children
[i
]->devnum
;
1254 spin_unlock_irq(&device_state_lock
);
1256 return info
->nports
+ 1;
1265 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1269 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1270 if (udev
->children
[i
])
1271 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1273 if (udev
->state
== USB_STATE_SUSPENDED
) {
1274 udev
->discon_suspended
= 1;
1275 udev
->active_duration
-= jiffies
;
1277 udev
->state
= USB_STATE_NOTATTACHED
;
1281 * usb_set_device_state - change a device's current state (usbcore, hcds)
1282 * @udev: pointer to device whose state should be changed
1283 * @new_state: new state value to be stored
1285 * udev->state is _not_ fully protected by the device lock. Although
1286 * most transitions are made only while holding the lock, the state can
1287 * can change to USB_STATE_NOTATTACHED at almost any time. This
1288 * is so that devices can be marked as disconnected as soon as possible,
1289 * without having to wait for any semaphores to be released. As a result,
1290 * all changes to any device's state must be protected by the
1291 * device_state_lock spinlock.
1293 * Once a device has been added to the device tree, all changes to its state
1294 * should be made using this routine. The state should _not_ be set directly.
1296 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1297 * Otherwise udev->state is set to new_state, and if new_state is
1298 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1299 * to USB_STATE_NOTATTACHED.
1301 void usb_set_device_state(struct usb_device
*udev
,
1302 enum usb_device_state new_state
)
1304 unsigned long flags
;
1306 spin_lock_irqsave(&device_state_lock
, flags
);
1307 if (udev
->state
== USB_STATE_NOTATTACHED
)
1309 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1311 /* root hub wakeup capabilities are managed out-of-band
1312 * and may involve silicon errata ... ignore them here.
1315 if (udev
->state
== USB_STATE_SUSPENDED
1316 || new_state
== USB_STATE_SUSPENDED
)
1317 ; /* No change to wakeup settings */
1318 else if (new_state
== USB_STATE_CONFIGURED
)
1319 device_init_wakeup(&udev
->dev
,
1320 (udev
->actconfig
->desc
.bmAttributes
1321 & USB_CONFIG_ATT_WAKEUP
));
1323 device_init_wakeup(&udev
->dev
, 0);
1325 if (udev
->state
== USB_STATE_SUSPENDED
&&
1326 new_state
!= USB_STATE_SUSPENDED
)
1327 udev
->active_duration
-= jiffies
;
1328 else if (new_state
== USB_STATE_SUSPENDED
&&
1329 udev
->state
!= USB_STATE_SUSPENDED
)
1330 udev
->active_duration
+= jiffies
;
1331 udev
->state
= new_state
;
1333 recursively_mark_NOTATTACHED(udev
);
1334 spin_unlock_irqrestore(&device_state_lock
, flags
);
1337 static void choose_address(struct usb_device
*udev
)
1340 struct usb_bus
*bus
= udev
->bus
;
1342 /* If khubd ever becomes multithreaded, this will need a lock */
1344 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1345 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1348 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1350 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1353 set_bit(devnum
, bus
->devmap
.devicemap
);
1354 udev
->devnum
= devnum
;
1358 static void release_address(struct usb_device
*udev
)
1360 if (udev
->devnum
> 0) {
1361 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1366 #ifdef CONFIG_USB_SUSPEND
1368 static void usb_stop_pm(struct usb_device
*udev
)
1370 /* Synchronize with the ksuspend thread to prevent any more
1371 * autosuspend requests from being submitted, and decrement
1372 * the parent's count of unsuspended children.
1375 if (udev
->parent
&& !udev
->discon_suspended
)
1376 usb_autosuspend_device(udev
->parent
);
1377 usb_pm_unlock(udev
);
1379 /* Stop any autosuspend requests already submitted */
1380 cancel_rearming_delayed_work(&udev
->autosuspend
);
1385 static inline void usb_stop_pm(struct usb_device
*udev
)
1391 * usb_disconnect - disconnect a device (usbcore-internal)
1392 * @pdev: pointer to device being disconnected
1393 * Context: !in_interrupt ()
1395 * Something got disconnected. Get rid of it and all of its children.
1397 * If *pdev is a normal device then the parent hub must already be locked.
1398 * If *pdev is a root hub then this routine will acquire the
1399 * usb_bus_list_lock on behalf of the caller.
1401 * Only hub drivers (including virtual root hub drivers for host
1402 * controllers) should ever call this.
1404 * This call is synchronous, and may not be used in an interrupt context.
1406 void usb_disconnect(struct usb_device
**pdev
)
1408 struct usb_device
*udev
= *pdev
;
1412 pr_debug ("%s nodev\n", __FUNCTION__
);
1416 /* mark the device as inactive, so any further urb submissions for
1417 * this device (and any of its children) will fail immediately.
1418 * this quiesces everyting except pending urbs.
1420 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1421 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1423 usb_lock_device(udev
);
1425 /* Free up all the children before we remove this device */
1426 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1427 if (udev
->children
[i
])
1428 usb_disconnect(&udev
->children
[i
]);
1431 /* deallocate hcd/hardware state ... nuking all pending urbs and
1432 * cleaning up all state associated with the current configuration
1433 * so that the hardware is now fully quiesced.
1435 dev_dbg (&udev
->dev
, "unregistering device\n");
1436 usb_disable_device(udev
, 0);
1437 usb_hcd_synchronize_unlinks(udev
);
1439 usb_unlock_device(udev
);
1441 /* Remove the device-specific files from sysfs. This must be
1442 * done with udev unlocked, because some of the attribute
1443 * routines try to acquire the device lock.
1445 usb_remove_sysfs_dev_files(udev
);
1447 /* Unregister the device. The device driver is responsible
1448 * for removing the device files from usbfs and sysfs and for
1449 * de-configuring the device.
1451 device_del(&udev
->dev
);
1453 /* Free the device number and delete the parent's children[]
1454 * (or root_hub) pointer.
1456 release_address(udev
);
1458 /* Avoid races with recursively_mark_NOTATTACHED() */
1459 spin_lock_irq(&device_state_lock
);
1461 spin_unlock_irq(&device_state_lock
);
1465 put_device(&udev
->dev
);
1468 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1469 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1473 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1476 static void announce_device(struct usb_device
*udev
)
1478 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1479 le16_to_cpu(udev
->descriptor
.idVendor
),
1480 le16_to_cpu(udev
->descriptor
.idProduct
));
1481 dev_info(&udev
->dev
,
1482 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1483 udev
->descriptor
.iManufacturer
,
1484 udev
->descriptor
.iProduct
,
1485 udev
->descriptor
.iSerialNumber
);
1486 show_string(udev
, "Product", udev
->product
);
1487 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1488 show_string(udev
, "SerialNumber", udev
->serial
);
1491 static inline void announce_device(struct usb_device
*udev
) { }
1494 #ifdef CONFIG_USB_OTG
1495 #include "otg_whitelist.h"
1499 * usb_new_device - perform initial device setup (usbcore-internal)
1500 * @udev: newly addressed device (in ADDRESS state)
1502 * This is called with devices which have been enumerated, but not yet
1503 * configured. The device descriptor is available, but not descriptors
1504 * for any device configuration. The caller must have locked either
1505 * the parent hub (if udev is a normal device) or else the
1506 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1507 * udev has already been installed, but udev is not yet visible through
1508 * sysfs or other filesystem code.
1510 * It will return if the device is configured properly or not. Zero if
1511 * the interface was registered with the driver core; else a negative
1514 * This call is synchronous, and may not be used in an interrupt context.
1516 * Only the hub driver or root-hub registrar should ever call this.
1518 int usb_new_device(struct usb_device
*udev
)
1522 /* Increment the parent's count of unsuspended children */
1524 usb_autoresume_device(udev
->parent
);
1526 err
= usb_get_configuration(udev
);
1528 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1533 /* read the standard strings and cache them if present */
1534 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1535 udev
->manufacturer
= usb_cache_string(udev
,
1536 udev
->descriptor
.iManufacturer
);
1537 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1539 #ifdef CONFIG_USB_OTG
1541 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1542 * to wake us after we've powered off VBUS; and HNP, switching roles
1543 * "host" to "peripheral". The OTG descriptor helps figure this out.
1545 if (!udev
->bus
->is_b_host
1547 && udev
->parent
== udev
->bus
->root_hub
) {
1548 struct usb_otg_descriptor
*desc
= 0;
1549 struct usb_bus
*bus
= udev
->bus
;
1551 /* descriptor may appear anywhere in config */
1552 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1553 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1554 USB_DT_OTG
, (void **) &desc
) == 0) {
1555 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1556 unsigned port1
= udev
->portnum
;
1558 dev_info(&udev
->dev
,
1559 "Dual-Role OTG device on %sHNP port\n",
1560 (port1
== bus
->otg_port
)
1563 /* enable HNP before suspend, it's simpler */
1564 if (port1
== bus
->otg_port
)
1565 bus
->b_hnp_enable
= 1;
1566 err
= usb_control_msg(udev
,
1567 usb_sndctrlpipe(udev
, 0),
1568 USB_REQ_SET_FEATURE
, 0,
1570 ? USB_DEVICE_B_HNP_ENABLE
1571 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1572 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1574 /* OTG MESSAGE: report errors here,
1575 * customize to match your product.
1577 dev_info(&udev
->dev
,
1578 "can't set HNP mode: %d\n",
1580 bus
->b_hnp_enable
= 0;
1586 if (!is_targeted(udev
)) {
1588 /* Maybe it can talk to us, though we can't talk to it.
1589 * (Includes HNP test device.)
1591 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1592 err
= usb_port_suspend(udev
, PMSG_SUSPEND
);
1594 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1601 /* export the usbdev device-node for libusb */
1602 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1603 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1605 /* Tell the world! */
1606 announce_device(udev
);
1608 /* Register the device. The device driver is responsible
1609 * for adding the device files to sysfs and for configuring
1612 err
= device_add(&udev
->dev
);
1614 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1616 usb_autosuspend_device(udev
->parent
);
1620 /* put device-specific files into sysfs */
1621 usb_create_sysfs_dev_files(udev
);
1627 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1632 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1633 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1635 struct usb_hcd
*hcd
;
1636 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1638 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1639 return hcd
->wireless
;
1643 #define PORT_RESET_TRIES 5
1644 #define SET_ADDRESS_TRIES 2
1645 #define GET_DESCRIPTOR_TRIES 2
1646 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1647 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1649 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1650 #define HUB_SHORT_RESET_TIME 10
1651 #define HUB_LONG_RESET_TIME 200
1652 #define HUB_RESET_TIMEOUT 500
1654 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1655 struct usb_device
*udev
, unsigned int delay
)
1657 int delay_time
, ret
;
1661 for (delay_time
= 0;
1662 delay_time
< HUB_RESET_TIMEOUT
;
1663 delay_time
+= delay
) {
1664 /* wait to give the device a chance to reset */
1667 /* read and decode port status */
1668 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1672 /* Device went away? */
1673 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1676 /* bomb out completely if the connection bounced */
1677 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1680 /* if we`ve finished resetting, then break out of the loop */
1681 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1682 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1683 if (hub_is_wusb(hub
))
1684 udev
->speed
= USB_SPEED_VARIABLE
;
1685 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1686 udev
->speed
= USB_SPEED_HIGH
;
1687 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1688 udev
->speed
= USB_SPEED_LOW
;
1690 udev
->speed
= USB_SPEED_FULL
;
1694 /* switch to the long delay after two short delay failures */
1695 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1696 delay
= HUB_LONG_RESET_TIME
;
1698 dev_dbg (hub
->intfdev
,
1699 "port %d not reset yet, waiting %dms\n",
1706 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1707 struct usb_device
*udev
, unsigned int delay
)
1711 /* Block EHCI CF initialization during the port reset.
1712 * Some companion controllers don't like it when they mix.
1714 down_read(&ehci_cf_port_reset_rwsem
);
1716 /* Reset the port */
1717 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1718 status
= set_port_feature(hub
->hdev
,
1719 port1
, USB_PORT_FEAT_RESET
);
1721 dev_err(hub
->intfdev
,
1722 "cannot reset port %d (err = %d)\n",
1725 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1726 if (status
&& status
!= -ENOTCONN
)
1727 dev_dbg(hub
->intfdev
,
1728 "port_wait_reset: err = %d\n",
1732 /* return on disconnect or reset */
1735 /* TRSTRCY = 10 ms; plus some extra */
1737 udev
->devnum
= 0; /* Device now at address 0 */
1741 clear_port_feature(hub
->hdev
,
1742 port1
, USB_PORT_FEAT_C_RESET
);
1743 /* FIXME need disconnect() for NOTATTACHED device */
1744 usb_set_device_state(udev
, status
1745 ? USB_STATE_NOTATTACHED
1746 : USB_STATE_DEFAULT
);
1750 dev_dbg (hub
->intfdev
,
1751 "port %d not enabled, trying reset again...\n",
1753 delay
= HUB_LONG_RESET_TIME
;
1756 dev_err (hub
->intfdev
,
1757 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1761 up_read(&ehci_cf_port_reset_rwsem
);
1767 #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
1768 USB_PORT_STAT_SUSPEND)
1769 #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
1771 /* Determine whether the device on a port is ready for a normal resume,
1772 * is ready for a reset-resume, or should be disconnected.
1774 static int check_port_resume_type(struct usb_device
*udev
,
1775 struct usb_hub
*hub
, int port1
,
1776 int status
, unsigned portchange
, unsigned portstatus
)
1778 /* Is the device still present? */
1779 if (status
|| (portstatus
& MASK_BITS
) != WANT_BITS
) {
1784 /* Can't do a normal resume if the port isn't enabled,
1785 * so try a reset-resume instead.
1787 else if (!(portstatus
& USB_PORT_STAT_ENABLE
) && !udev
->reset_resume
) {
1788 if (udev
->persist_enabled
)
1789 udev
->reset_resume
= 1;
1795 dev_dbg(hub
->intfdev
,
1796 "port %d status %04x.%04x after resume, %d\n",
1797 port1
, portchange
, portstatus
, status
);
1798 } else if (udev
->reset_resume
) {
1800 /* Late port handoff can set status-change bits */
1801 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
1802 clear_port_feature(hub
->hdev
, port1
,
1803 USB_PORT_FEAT_C_CONNECTION
);
1804 if (portchange
& USB_PORT_STAT_C_ENABLE
)
1805 clear_port_feature(hub
->hdev
, port1
,
1806 USB_PORT_FEAT_C_ENABLE
);
1812 #ifdef CONFIG_USB_SUSPEND
1815 * usb_port_suspend - suspend a usb device's upstream port
1816 * @udev: device that's no longer in active use, not a root hub
1817 * Context: must be able to sleep; device not locked; pm locks held
1819 * Suspends a USB device that isn't in active use, conserving power.
1820 * Devices may wake out of a suspend, if anything important happens,
1821 * using the remote wakeup mechanism. They may also be taken out of
1822 * suspend by the host, using usb_port_resume(). It's also routine
1823 * to disconnect devices while they are suspended.
1825 * This only affects the USB hardware for a device; its interfaces
1826 * (and, for hubs, child devices) must already have been suspended.
1828 * Selective port suspend reduces power; most suspended devices draw
1829 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1830 * All devices below the suspended port are also suspended.
1832 * Devices leave suspend state when the host wakes them up. Some devices
1833 * also support "remote wakeup", where the device can activate the USB
1834 * tree above them to deliver data, such as a keypress or packet. In
1835 * some cases, this wakes the USB host.
1837 * Suspending OTG devices may trigger HNP, if that's been enabled
1838 * between a pair of dual-role devices. That will change roles, such
1839 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1841 * Devices on USB hub ports have only one "suspend" state, corresponding
1842 * to ACPI D2, "may cause the device to lose some context".
1843 * State transitions include:
1845 * - suspend, resume ... when the VBUS power link stays live
1846 * - suspend, disconnect ... VBUS lost
1848 * Once VBUS drop breaks the circuit, the port it's using has to go through
1849 * normal re-enumeration procedures, starting with enabling VBUS power.
1850 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1851 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1852 * timer, no SRP, no requests through sysfs.
1854 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1855 * the root hub for their bus goes into global suspend ... so we don't
1856 * (falsely) update the device power state to say it suspended.
1858 * Returns 0 on success, else negative errno.
1860 int usb_port_suspend(struct usb_device
*udev
)
1862 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1863 int port1
= udev
->portnum
;
1866 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1868 /* enable remote wakeup when appropriate; this lets the device
1869 * wake up the upstream hub (including maybe the root hub).
1871 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1872 * we don't explicitly enable it here.
1874 if (udev
->do_remote_wakeup
) {
1875 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1876 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1877 USB_DEVICE_REMOTE_WAKEUP
, 0,
1879 USB_CTRL_SET_TIMEOUT
);
1881 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
1886 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1888 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
1890 /* paranoia: "should not happen" */
1891 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1892 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1893 USB_DEVICE_REMOTE_WAKEUP
, 0,
1895 USB_CTRL_SET_TIMEOUT
);
1897 /* device has up to 10 msec to fully suspend */
1898 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1899 udev
->auto_pm
? "auto-" : "");
1900 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1907 * If the USB "suspend" state is in use (rather than "global suspend"),
1908 * many devices will be individually taken out of suspend state using
1909 * special "resume" signaling. This routine kicks in shortly after
1910 * hardware resume signaling is finished, either because of selective
1911 * resume (by host) or remote wakeup (by device) ... now see what changed
1912 * in the tree that's rooted at this device.
1914 * If @udev->reset_resume is set then the device is reset before the
1915 * status check is done.
1917 static int finish_port_resume(struct usb_device
*udev
)
1922 /* caller owns the udev device lock */
1923 dev_dbg(&udev
->dev
, "%s\n",
1924 udev
->reset_resume
? "finish reset-resume" : "finish resume");
1926 /* usb ch9 identifies four variants of SUSPENDED, based on what
1927 * state the device resumes to. Linux currently won't see the
1928 * first two on the host side; they'd be inside hub_port_init()
1929 * during many timeouts, but khubd can't suspend until later.
1931 usb_set_device_state(udev
, udev
->actconfig
1932 ? USB_STATE_CONFIGURED
1933 : USB_STATE_ADDRESS
);
1935 /* 10.5.4.5 says not to reset a suspended port if the attached
1936 * device is enabled for remote wakeup. Hence the reset
1937 * operation is carried out here, after the port has been
1940 if (udev
->reset_resume
)
1942 status
= usb_reset_and_verify_device(udev
);
1944 /* 10.5.4.5 says be sure devices in the tree are still there.
1945 * For now let's assume the device didn't go crazy on resume,
1946 * and device drivers will know about any resume quirks.
1950 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1952 status
= (status
> 0 ? 0 : -ENODEV
);
1954 /* If a normal resume failed, try doing a reset-resume */
1955 if (status
&& !udev
->reset_resume
&& udev
->persist_enabled
) {
1956 dev_dbg(&udev
->dev
, "retry with reset-resume\n");
1957 udev
->reset_resume
= 1;
1958 goto retry_reset_resume
;
1963 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
1965 } else if (udev
->actconfig
) {
1966 le16_to_cpus(&devstatus
);
1967 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
1968 status
= usb_control_msg(udev
,
1969 usb_sndctrlpipe(udev
, 0),
1970 USB_REQ_CLEAR_FEATURE
,
1972 USB_DEVICE_REMOTE_WAKEUP
, 0,
1974 USB_CTRL_SET_TIMEOUT
);
1977 "disable remote wakeup, status %d\n",
1986 * usb_port_resume - re-activate a suspended usb device's upstream port
1987 * @udev: device to re-activate, not a root hub
1988 * Context: must be able to sleep; device not locked; pm locks held
1990 * This will re-activate the suspended device, increasing power usage
1991 * while letting drivers communicate again with its endpoints.
1992 * USB resume explicitly guarantees that the power session between
1993 * the host and the device is the same as it was when the device
1996 * If @udev->reset_resume is set then this routine won't check that the
1997 * port is still enabled. Furthermore, finish_port_resume() above will
1998 * reset @udev. The end result is that a broken power session can be
1999 * recovered and @udev will appear to persist across a loss of VBUS power.
2001 * For example, if a host controller doesn't maintain VBUS suspend current
2002 * during a system sleep or is reset when the system wakes up, all the USB
2003 * power sessions below it will be broken. This is especially troublesome
2004 * for mass-storage devices containing mounted filesystems, since the
2005 * device will appear to have disconnected and all the memory mappings
2006 * to it will be lost. Using the USB_PERSIST facility, the device can be
2007 * made to appear as if it had not disconnected.
2009 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
2010 * every effort to insure that the same device is present after the
2011 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2012 * quite possible for a device to remain unaltered but its media to be
2013 * changed. If the user replaces a flash memory card while the system is
2014 * asleep, he will have only himself to blame when the filesystem on the
2015 * new card is corrupted and the system crashes.
2017 * Returns 0 on success, else negative errno.
2019 int usb_port_resume(struct usb_device
*udev
)
2021 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2022 int port1
= udev
->portnum
;
2024 u16 portchange
, portstatus
;
2026 /* Skip the initial Clear-Suspend step for a remote wakeup */
2027 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2028 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
2029 goto SuspendCleared
;
2031 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2033 set_bit(port1
, hub
->busy_bits
);
2035 /* see 7.1.7.7; affects power usage, but not budgeting */
2036 status
= clear_port_feature(hub
->hdev
,
2037 port1
, USB_PORT_FEAT_SUSPEND
);
2039 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
2042 /* drive resume for at least 20 msec */
2043 dev_dbg(&udev
->dev
, "usb %sresume\n",
2044 udev
->auto_pm
? "auto-" : "");
2047 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2048 * stop resume signaling. Then finish the resume
2051 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2053 /* TRSMRCY = 10 msec */
2059 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
2060 clear_port_feature(hub
->hdev
, port1
,
2061 USB_PORT_FEAT_C_SUSPEND
);
2064 clear_bit(port1
, hub
->busy_bits
);
2065 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
2066 usb_enable_root_hub_irq(hub
->hdev
->bus
);
2068 status
= check_port_resume_type(udev
,
2069 hub
, port1
, status
, portchange
, portstatus
);
2071 status
= finish_port_resume(udev
);
2073 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2074 hub_port_logical_disconnect(hub
, port1
);
2079 /* caller has locked udev */
2080 static int remote_wakeup(struct usb_device
*udev
)
2084 if (udev
->state
== USB_STATE_SUSPENDED
) {
2085 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
2086 usb_mark_last_busy(udev
);
2087 status
= usb_external_resume_device(udev
);
2092 #else /* CONFIG_USB_SUSPEND */
2094 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2096 int usb_port_suspend(struct usb_device
*udev
)
2101 /* However we may need to do a reset-resume */
2103 int usb_port_resume(struct usb_device
*udev
)
2105 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2106 int port1
= udev
->portnum
;
2108 u16 portchange
, portstatus
;
2110 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2111 status
= check_port_resume_type(udev
,
2112 hub
, port1
, status
, portchange
, portstatus
);
2115 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2116 hub_port_logical_disconnect(hub
, port1
);
2117 } else if (udev
->reset_resume
) {
2118 dev_dbg(&udev
->dev
, "reset-resume\n");
2119 status
= usb_reset_and_verify_device(udev
);
2124 static inline int remote_wakeup(struct usb_device
*udev
)
2131 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
2133 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2134 struct usb_device
*hdev
= hub
->hdev
;
2137 /* fail if children aren't already suspended */
2138 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
2139 struct usb_device
*udev
;
2141 udev
= hdev
->children
[port1
-1];
2142 if (udev
&& udev
->can_submit
) {
2144 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
2150 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
2152 /* stop khubd and related activity */
2153 hub_quiesce(hub
, HUB_SUSPEND
);
2157 static int hub_resume(struct usb_interface
*intf
)
2159 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2161 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2162 hub_activate(hub
, HUB_RESUME
);
2166 static int hub_reset_resume(struct usb_interface
*intf
)
2168 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2170 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2171 hub_activate(hub
, HUB_RESET_RESUME
);
2176 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2177 * @rhdev: struct usb_device for the root hub
2179 * The USB host controller driver calls this function when its root hub
2180 * is resumed and Vbus power has been interrupted or the controller
2181 * has been reset. The routine marks @rhdev as having lost power.
2182 * When the hub driver is resumed it will take notice and carry out
2183 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2184 * the others will be disconnected.
2186 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
2188 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
2189 rhdev
->reset_resume
= 1;
2191 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
2193 #else /* CONFIG_PM */
2195 static inline int remote_wakeup(struct usb_device
*udev
)
2200 #define hub_suspend NULL
2201 #define hub_resume NULL
2202 #define hub_reset_resume NULL
2206 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2208 * Between connect detection and reset signaling there must be a delay
2209 * of 100ms at least for debounce and power-settling. The corresponding
2210 * timer shall restart whenever the downstream port detects a disconnect.
2212 * Apparently there are some bluetooth and irda-dongles and a number of
2213 * low-speed devices for which this debounce period may last over a second.
2214 * Not covered by the spec - but easy to deal with.
2216 * This implementation uses a 1500ms total debounce timeout; if the
2217 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2218 * every 25ms for transient disconnects. When the port status has been
2219 * unchanged for 100ms it returns the port status.
2221 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2224 int total_time
, stable_time
= 0;
2225 u16 portchange
, portstatus
;
2226 unsigned connection
= 0xffff;
2228 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2229 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2233 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2234 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2235 stable_time
+= HUB_DEBOUNCE_STEP
;
2236 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2240 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2243 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2244 clear_port_feature(hub
->hdev
, port1
,
2245 USB_PORT_FEAT_C_CONNECTION
);
2248 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2250 msleep(HUB_DEBOUNCE_STEP
);
2253 dev_dbg (hub
->intfdev
,
2254 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2255 port1
, total_time
, stable_time
, portstatus
);
2257 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2262 static void ep0_reinit(struct usb_device
*udev
)
2264 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2265 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2266 usb_enable_endpoint(udev
, &udev
->ep0
);
2269 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2270 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2272 static int hub_set_address(struct usb_device
*udev
, int devnum
)
2278 if (udev
->state
== USB_STATE_ADDRESS
)
2280 if (udev
->state
!= USB_STATE_DEFAULT
)
2282 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2283 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
2284 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2286 udev
->devnum
= devnum
; /* Device now using proper address */
2287 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2293 /* Reset device, (re)assign address, get device descriptor.
2294 * Device connection must be stable, no more debouncing needed.
2295 * Returns device in USB_STATE_ADDRESS, except on error.
2297 * If this is called for an already-existing device (as part of
2298 * usb_reset_and_verify_device), the caller must own the device lock. For a
2299 * newly detected device that is not accessible through any global
2300 * pointers, it's not necessary to lock the device.
2303 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2306 static DEFINE_MUTEX(usb_address0_mutex
);
2308 struct usb_device
*hdev
= hub
->hdev
;
2310 unsigned delay
= HUB_SHORT_RESET_TIME
;
2311 enum usb_device_speed oldspeed
= udev
->speed
;
2313 int devnum
= udev
->devnum
;
2315 /* root hub ports have a slightly longer reset period
2316 * (from USB 2.0 spec, section 7.1.7.5)
2318 if (!hdev
->parent
) {
2319 delay
= HUB_ROOT_RESET_TIME
;
2320 if (port1
== hdev
->bus
->otg_port
)
2321 hdev
->bus
->b_hnp_enable
= 0;
2324 /* Some low speed devices have problems with the quick delay, so */
2325 /* be a bit pessimistic with those devices. RHbug #23670 */
2326 if (oldspeed
== USB_SPEED_LOW
)
2327 delay
= HUB_LONG_RESET_TIME
;
2329 mutex_lock(&usb_address0_mutex
);
2331 /* Reset the device; full speed may morph to high speed */
2332 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2333 if (retval
< 0) /* error or disconnect */
2335 /* success, speed is known */
2338 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2339 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2342 oldspeed
= udev
->speed
;
2344 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2345 * it's fixed size except for full speed devices.
2346 * For Wireless USB devices, ep0 max packet is always 512 (tho
2347 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2349 switch (udev
->speed
) {
2350 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2351 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2353 case USB_SPEED_HIGH
: /* fixed at 64 */
2354 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2356 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2357 /* to determine the ep0 maxpacket size, try to read
2358 * the device descriptor to get bMaxPacketSize0 and
2359 * then correct our initial guess.
2361 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2363 case USB_SPEED_LOW
: /* fixed at 8 */
2364 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2371 switch (udev
->speed
) {
2372 case USB_SPEED_LOW
: speed
= "low"; break;
2373 case USB_SPEED_FULL
: speed
= "full"; break;
2374 case USB_SPEED_HIGH
: speed
= "high"; break;
2375 case USB_SPEED_VARIABLE
:
2379 default: speed
= "?"; break;
2381 dev_info (&udev
->dev
,
2382 "%s %s speed %sUSB device using %s and address %d\n",
2383 (udev
->config
) ? "reset" : "new", speed
, type
,
2384 udev
->bus
->controller
->driver
->name
, devnum
);
2386 /* Set up TT records, if needed */
2388 udev
->tt
= hdev
->tt
;
2389 udev
->ttport
= hdev
->ttport
;
2390 } else if (udev
->speed
!= USB_SPEED_HIGH
2391 && hdev
->speed
== USB_SPEED_HIGH
) {
2393 dev_err(&udev
->dev
, "parent hub has no TT\n");
2397 udev
->tt
= &hub
->tt
;
2398 udev
->ttport
= port1
;
2401 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2402 * Because device hardware and firmware is sometimes buggy in
2403 * this area, and this is how Linux has done it for ages.
2404 * Change it cautiously.
2406 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2407 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2408 * so it may help with some non-standards-compliant devices.
2409 * Otherwise we start with SET_ADDRESS and then try to read the
2410 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2413 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2414 if (USE_NEW_SCHEME(retry_counter
)) {
2415 struct usb_device_descriptor
*buf
;
2418 #define GET_DESCRIPTOR_BUFSIZE 64
2419 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2425 /* Retry on all errors; some devices are flakey.
2426 * 255 is for WUSB devices, we actually need to use
2427 * 512 (WUSB1.0[4.8.1]).
2429 for (j
= 0; j
< 3; ++j
) {
2430 buf
->bMaxPacketSize0
= 0;
2431 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2432 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2433 USB_DT_DEVICE
<< 8, 0,
2434 buf
, GET_DESCRIPTOR_BUFSIZE
,
2435 USB_CTRL_GET_TIMEOUT
);
2436 switch (buf
->bMaxPacketSize0
) {
2437 case 8: case 16: case 32: case 64: case 255:
2438 if (buf
->bDescriptorType
==
2452 udev
->descriptor
.bMaxPacketSize0
=
2453 buf
->bMaxPacketSize0
;
2456 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2457 if (retval
< 0) /* error or disconnect */
2459 if (oldspeed
!= udev
->speed
) {
2461 "device reset changed speed!\n");
2467 "device descriptor read/64, error %d\n",
2472 #undef GET_DESCRIPTOR_BUFSIZE
2475 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2476 retval
= hub_set_address(udev
, devnum
);
2483 "device not accepting address %d, error %d\n",
2488 /* cope with hardware quirkiness:
2489 * - let SET_ADDRESS settle, some device hardware wants it
2490 * - read ep0 maxpacket even for high and low speed,
2493 if (USE_NEW_SCHEME(retry_counter
))
2496 retval
= usb_get_device_descriptor(udev
, 8);
2499 "device descriptor read/8, error %d\n",
2511 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2512 512 : udev
->descriptor
.bMaxPacketSize0
;
2513 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2514 if (udev
->speed
== USB_SPEED_LOW
||
2515 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2516 dev_err(&udev
->dev
, "Invalid ep0 maxpacket: %d\n", i
);
2520 if (udev
->speed
== USB_SPEED_FULL
)
2521 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2523 dev_warn(&udev
->dev
, "Using ep0 maxpacket: %d\n", i
);
2524 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2528 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2529 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2530 dev_err(&udev
->dev
, "device descriptor read/all, error %d\n",
2541 hub_port_disable(hub
, port1
, 0);
2542 udev
->devnum
= devnum
; /* for disconnect processing */
2544 mutex_unlock(&usb_address0_mutex
);
2549 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2551 struct usb_qualifier_descriptor
*qual
;
2554 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2558 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2559 qual
, sizeof *qual
);
2560 if (status
== sizeof *qual
) {
2561 dev_info(&udev
->dev
, "not running at top speed; "
2562 "connect to a high speed hub\n");
2563 /* hub LEDs are probably harder to miss than syslog */
2564 if (hub
->has_indicators
) {
2565 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2566 schedule_delayed_work (&hub
->leds
, 0);
2573 hub_power_remaining (struct usb_hub
*hub
)
2575 struct usb_device
*hdev
= hub
->hdev
;
2579 if (!hub
->limited_power
)
2582 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2583 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2584 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2590 /* Unconfigured devices may not use more than 100mA,
2591 * or 8mA for OTG ports */
2592 if (udev
->actconfig
)
2593 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2594 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2598 if (delta
> hub
->mA_per_port
)
2599 dev_warn(&udev
->dev
,
2600 "%dmA is over %umA budget for port %d!\n",
2601 delta
, hub
->mA_per_port
, port1
);
2604 if (remaining
< 0) {
2605 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2612 /* Handle physical or logical connection change events.
2613 * This routine is called when:
2614 * a port connection-change occurs;
2615 * a port enable-change occurs (often caused by EMI);
2616 * usb_reset_and_verify_device() encounters changed descriptors (as from
2617 * a firmware download)
2618 * caller already locked the hub
2620 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2621 u16 portstatus
, u16 portchange
)
2623 struct usb_device
*hdev
= hub
->hdev
;
2624 struct device
*hub_dev
= hub
->intfdev
;
2625 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2626 unsigned wHubCharacteristics
=
2627 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2628 struct usb_device
*udev
;
2632 "port %d, status %04x, change %04x, %s\n",
2633 port1
, portstatus
, portchange
, portspeed (portstatus
));
2635 if (hub
->has_indicators
) {
2636 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2637 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2640 #ifdef CONFIG_USB_OTG
2641 /* during HNP, don't repeat the debounce */
2642 if (hdev
->bus
->is_b_host
)
2643 portchange
&= ~(USB_PORT_STAT_C_CONNECTION
|
2644 USB_PORT_STAT_C_ENABLE
);
2647 /* Try to resuscitate an existing device */
2648 udev
= hdev
->children
[port1
-1];
2649 if ((portstatus
& USB_PORT_STAT_CONNECTION
) && udev
&&
2650 udev
->state
!= USB_STATE_NOTATTACHED
) {
2651 usb_lock_device(udev
);
2652 if (portstatus
& USB_PORT_STAT_ENABLE
) {
2653 status
= 0; /* Nothing to do */
2655 #ifdef CONFIG_USB_SUSPEND
2656 } else if (udev
->state
== USB_STATE_SUSPENDED
&&
2657 udev
->persist_enabled
) {
2658 /* For a suspended device, treat this as a
2659 * remote wakeup event.
2661 status
= remote_wakeup(udev
);
2665 status
= -ENODEV
; /* Don't resuscitate */
2667 usb_unlock_device(udev
);
2670 clear_bit(port1
, hub
->change_bits
);
2675 /* Disconnect any existing devices under this port */
2677 usb_disconnect(&hdev
->children
[port1
-1]);
2678 clear_bit(port1
, hub
->change_bits
);
2680 /* We can forget about a "removed" device when there's a physical
2681 * disconnect or the connect status changes.
2683 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
2684 (portchange
& USB_PORT_STAT_C_CONNECTION
))
2685 clear_bit(port1
, hub
->removed_bits
);
2687 if (portchange
& (USB_PORT_STAT_C_CONNECTION
|
2688 USB_PORT_STAT_C_ENABLE
)) {
2689 status
= hub_port_debounce(hub
, port1
);
2691 if (printk_ratelimit())
2692 dev_err(hub_dev
, "connect-debounce failed, "
2693 "port %d disabled\n", port1
);
2694 portstatus
&= ~USB_PORT_STAT_CONNECTION
;
2696 portstatus
= status
;
2700 /* Return now if debouncing failed or nothing is connected or
2701 * the device was "removed".
2703 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
2704 test_bit(port1
, hub
->removed_bits
)) {
2706 /* maybe switch power back on (e.g. root hub was reset) */
2707 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2708 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2709 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2711 if (portstatus
& USB_PORT_STAT_ENABLE
)
2716 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2718 /* reallocate for each attempt, since references
2719 * to the previous one can escape in various ways
2721 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2724 "couldn't allocate port %d usb_device\n",
2729 usb_set_device_state(udev
, USB_STATE_POWERED
);
2730 udev
->speed
= USB_SPEED_UNKNOWN
;
2731 udev
->bus_mA
= hub
->mA_per_port
;
2732 udev
->level
= hdev
->level
+ 1;
2734 /* set the address */
2735 choose_address(udev
);
2736 if (udev
->devnum
<= 0) {
2737 status
= -ENOTCONN
; /* Don't retry */
2741 /* reset and get descriptor */
2742 status
= hub_port_init(hub
, udev
, port1
, i
);
2746 usb_detect_quirks(udev
);
2747 if (udev
->quirks
& USB_QUIRK_DELAY_INIT
)
2750 /* consecutive bus-powered hubs aren't reliable; they can
2751 * violate the voltage drop budget. if the new child has
2752 * a "powered" LED, users should notice we didn't enable it
2753 * (without reading syslog), even without per-port LEDs
2756 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2757 && udev
->bus_mA
< 100) {
2760 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2763 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2766 le16_to_cpus(&devstat
);
2767 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2769 "can't connect bus-powered hub "
2771 if (hub
->has_indicators
) {
2772 hub
->indicator
[port1
-1] =
2773 INDICATOR_AMBER_BLINK
;
2774 schedule_delayed_work (&hub
->leds
, 0);
2776 status
= -ENOTCONN
; /* Don't retry */
2781 /* check for devices running slower than they could */
2782 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2783 && udev
->speed
== USB_SPEED_FULL
2784 && highspeed_hubs
!= 0)
2785 check_highspeed (hub
, udev
, port1
);
2787 /* Store the parent's children[] pointer. At this point
2788 * udev becomes globally accessible, although presumably
2789 * no one will look at it until hdev is unlocked.
2793 /* We mustn't add new devices if the parent hub has
2794 * been disconnected; we would race with the
2795 * recursively_mark_NOTATTACHED() routine.
2797 spin_lock_irq(&device_state_lock
);
2798 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2801 hdev
->children
[port1
-1] = udev
;
2802 spin_unlock_irq(&device_state_lock
);
2804 /* Run it through the hoops (find a driver, etc) */
2806 status
= usb_new_device(udev
);
2808 spin_lock_irq(&device_state_lock
);
2809 hdev
->children
[port1
-1] = NULL
;
2810 spin_unlock_irq(&device_state_lock
);
2817 status
= hub_power_remaining(hub
);
2819 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2824 hub_port_disable(hub
, port1
, 1);
2827 release_address(udev
);
2829 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
2832 if (hub
->hdev
->parent
||
2833 !hcd
->driver
->port_handed_over
||
2834 !(hcd
->driver
->port_handed_over
)(hcd
, port1
))
2835 dev_err(hub_dev
, "unable to enumerate USB device on port %d\n",
2839 hub_port_disable(hub
, port1
, 1);
2840 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
2841 hcd
->driver
->relinquish_port(hcd
, port1
);
2844 static void hub_events(void)
2846 struct list_head
*tmp
;
2847 struct usb_device
*hdev
;
2848 struct usb_interface
*intf
;
2849 struct usb_hub
*hub
;
2850 struct device
*hub_dev
;
2859 * We restart the list every time to avoid a deadlock with
2860 * deleting hubs downstream from this one. This should be
2861 * safe since we delete the hub from the event list.
2862 * Not the most efficient, but avoids deadlocks.
2866 /* Grab the first entry at the beginning of the list */
2867 spin_lock_irq(&hub_event_lock
);
2868 if (list_empty(&hub_event_list
)) {
2869 spin_unlock_irq(&hub_event_lock
);
2873 tmp
= hub_event_list
.next
;
2876 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2877 kref_get(&hub
->kref
);
2878 spin_unlock_irq(&hub_event_lock
);
2881 hub_dev
= hub
->intfdev
;
2882 intf
= to_usb_interface(hub_dev
);
2883 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2884 hdev
->state
, hub
->descriptor
2885 ? hub
->descriptor
->bNbrPorts
2887 /* NOTE: expects max 15 ports... */
2888 (u16
) hub
->change_bits
[0],
2889 (u16
) hub
->event_bits
[0]);
2891 /* Lock the device, then check to see if we were
2892 * disconnected while waiting for the lock to succeed. */
2893 usb_lock_device(hdev
);
2894 if (unlikely(hub
->disconnected
))
2897 /* If the hub has died, clean up after it */
2898 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2899 hub
->error
= -ENODEV
;
2900 hub_quiesce(hub
, HUB_DISCONNECT
);
2905 ret
= usb_autopm_get_interface(intf
);
2907 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2911 /* If this is an inactive hub, do nothing */
2916 dev_dbg (hub_dev
, "resetting for error %d\n",
2919 ret
= usb_reset_device(hdev
);
2922 "error resetting hub: %d\n", ret
);
2930 /* deal with port status changes */
2931 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2932 if (test_bit(i
, hub
->busy_bits
))
2934 connect_change
= test_bit(i
, hub
->change_bits
);
2935 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2939 ret
= hub_port_status(hub
, i
,
2940 &portstatus
, &portchange
);
2944 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2945 clear_port_feature(hdev
, i
,
2946 USB_PORT_FEAT_C_CONNECTION
);
2950 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2951 if (!connect_change
)
2953 "port %d enable change, "
2956 clear_port_feature(hdev
, i
,
2957 USB_PORT_FEAT_C_ENABLE
);
2960 * EM interference sometimes causes badly
2961 * shielded USB devices to be shutdown by
2962 * the hub, this hack enables them again.
2963 * Works at least with mouse driver.
2965 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2967 && hdev
->children
[i
-1]) {
2970 "disabled by hub (EMI?), "
2977 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2978 struct usb_device
*udev
;
2980 clear_port_feature(hdev
, i
,
2981 USB_PORT_FEAT_C_SUSPEND
);
2982 udev
= hdev
->children
[i
-1];
2984 /* TRSMRCY = 10 msec */
2987 usb_lock_device(udev
);
2988 ret
= remote_wakeup(hdev
->
2990 usb_unlock_device(udev
);
2995 hub_port_disable(hub
, i
, 1);
2998 "resume on port %d, status %d\n",
3002 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
3006 dev_dbg(hub_dev
, "over-current change on port "
3008 clear_port_feature(hdev
, i
,
3009 USB_PORT_FEAT_C_OVER_CURRENT
);
3010 msleep(100); /* Cool down */
3011 hub_power_on(hub
, true);
3012 hub_port_status(hub
, i
, &status
, &unused
);
3013 if (status
& USB_PORT_STAT_OVERCURRENT
)
3014 dev_err(hub_dev
, "over-current "
3015 "condition on port %d\n", i
);
3018 if (portchange
& USB_PORT_STAT_C_RESET
) {
3020 "reset change on port %d\n",
3022 clear_port_feature(hdev
, i
,
3023 USB_PORT_FEAT_C_RESET
);
3027 hub_port_connect_change(hub
, i
,
3028 portstatus
, portchange
);
3031 /* deal with hub status changes */
3032 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
3034 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
3035 dev_err (hub_dev
, "get_hub_status failed\n");
3037 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
3038 dev_dbg (hub_dev
, "power change\n");
3039 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
3040 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
3041 /* FIXME: Is this always true? */
3042 hub
->limited_power
= 1;
3044 hub
->limited_power
= 0;
3046 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
3050 dev_dbg(hub_dev
, "over-current change\n");
3051 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
3052 msleep(500); /* Cool down */
3053 hub_power_on(hub
, true);
3054 hub_hub_status(hub
, &status
, &unused
);
3055 if (status
& HUB_STATUS_OVERCURRENT
)
3056 dev_err(hub_dev
, "over-current "
3061 /* If this is a root hub, tell the HCD it's okay to
3062 * re-enable port-change interrupts now. */
3063 if (!hdev
->parent
&& !hub
->busy_bits
[0])
3064 usb_enable_root_hub_irq(hdev
->bus
);
3067 /* Allow autosuspend if we're not going to run again */
3068 if (list_empty(&hub
->event_list
))
3069 usb_autopm_enable(intf
);
3071 usb_unlock_device(hdev
);
3072 kref_put(&hub
->kref
, hub_release
);
3074 } /* end while (1) */
3077 static int hub_thread(void *__unused
)
3079 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3080 * port handover. Otherwise it might see that a full-speed device
3081 * was gone before the EHCI controller had handed its port over to
3082 * the companion full-speed controller.
3088 wait_event_interruptible(khubd_wait
,
3089 !list_empty(&hub_event_list
) ||
3090 kthread_should_stop());
3092 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
3094 pr_debug("%s: khubd exiting\n", usbcore_name
);
3098 static struct usb_device_id hub_id_table
[] = {
3099 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
3100 .bDeviceClass
= USB_CLASS_HUB
},
3101 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
3102 .bInterfaceClass
= USB_CLASS_HUB
},
3103 { } /* Terminating entry */
3106 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
3108 static struct usb_driver hub_driver
= {
3111 .disconnect
= hub_disconnect
,
3112 .suspend
= hub_suspend
,
3113 .resume
= hub_resume
,
3114 .reset_resume
= hub_reset_resume
,
3115 .pre_reset
= hub_pre_reset
,
3116 .post_reset
= hub_post_reset
,
3118 .id_table
= hub_id_table
,
3119 .supports_autosuspend
= 1,
3122 int usb_hub_init(void)
3124 if (usb_register(&hub_driver
) < 0) {
3125 printk(KERN_ERR
"%s: can't register hub driver\n",
3130 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
3131 if (!IS_ERR(khubd_task
))
3134 /* Fall through if kernel_thread failed */
3135 usb_deregister(&hub_driver
);
3136 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
3141 void usb_hub_cleanup(void)
3143 kthread_stop(khubd_task
);
3146 * Hub resources are freed for us by usb_deregister. It calls
3147 * usb_driver_purge on every device which in turn calls that
3148 * devices disconnect function if it is using this driver.
3149 * The hub_disconnect function takes care of releasing the
3150 * individual hub resources. -greg
3152 usb_deregister(&hub_driver
);
3153 } /* usb_hub_cleanup() */
3155 static int descriptors_changed(struct usb_device
*udev
,
3156 struct usb_device_descriptor
*old_device_descriptor
)
3160 unsigned serial_len
= 0;
3162 unsigned old_length
;
3166 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
3167 sizeof(*old_device_descriptor
)) != 0)
3170 /* Since the idVendor, idProduct, and bcdDevice values in the
3171 * device descriptor haven't changed, we will assume the
3172 * Manufacturer and Product strings haven't changed either.
3173 * But the SerialNumber string could be different (e.g., a
3174 * different flash card of the same brand).
3177 serial_len
= strlen(udev
->serial
) + 1;
3180 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3181 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3182 len
= max(len
, old_length
);
3185 buf
= kmalloc(len
, GFP_NOIO
);
3187 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
3188 /* assume the worst */
3191 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3192 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3193 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
3195 if (length
!= old_length
) {
3196 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
3201 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
3203 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
3205 ((struct usb_config_descriptor
*) buf
)->
3206 bConfigurationValue
);
3212 if (!changed
&& serial_len
) {
3213 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
3215 if (length
+ 1 != serial_len
) {
3216 dev_dbg(&udev
->dev
, "serial string error %d\n",
3219 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
3220 dev_dbg(&udev
->dev
, "serial string changed\n");
3230 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
3231 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3233 * WARNING - don't use this routine to reset a composite device
3234 * (one with multiple interfaces owned by separate drivers)!
3235 * Use usb_reset_device() instead.
3237 * Do a port reset, reassign the device's address, and establish its
3238 * former operating configuration. If the reset fails, or the device's
3239 * descriptors change from their values before the reset, or the original
3240 * configuration and altsettings cannot be restored, a flag will be set
3241 * telling khubd to pretend the device has been disconnected and then
3242 * re-connected. All drivers will be unbound, and the device will be
3243 * re-enumerated and probed all over again.
3245 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3246 * flagged for logical disconnection, or some other negative error code
3247 * if the reset wasn't even attempted.
3249 * The caller must own the device lock. For example, it's safe to use
3250 * this from a driver probe() routine after downloading new firmware.
3251 * For calls that might not occur during probe(), drivers should lock
3252 * the device using usb_lock_device_for_reset().
3254 * Locking exception: This routine may also be called from within an
3255 * autoresume handler. Such usage won't conflict with other tasks
3256 * holding the device lock because these tasks should always call
3257 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3259 static int usb_reset_and_verify_device(struct usb_device
*udev
)
3261 struct usb_device
*parent_hdev
= udev
->parent
;
3262 struct usb_hub
*parent_hub
;
3263 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3265 int port1
= udev
->portnum
;
3267 if (udev
->state
== USB_STATE_NOTATTACHED
||
3268 udev
->state
== USB_STATE_SUSPENDED
) {
3269 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3275 /* this requires hcd-specific logic; see OHCI hc_restart() */
3276 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
3279 parent_hub
= hdev_to_hub(parent_hdev
);
3281 set_bit(port1
, parent_hub
->busy_bits
);
3282 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3284 /* ep0 maxpacket size may change; let the HCD know about it.
3285 * Other endpoints will be handled by re-enumeration. */
3287 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3288 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
3291 clear_bit(port1
, parent_hub
->busy_bits
);
3292 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
3293 usb_enable_root_hub_irq(parent_hdev
->bus
);
3298 /* Device might have changed firmware (DFU or similar) */
3299 if (descriptors_changed(udev
, &descriptor
)) {
3300 dev_info(&udev
->dev
, "device firmware changed\n");
3301 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3305 if (!udev
->actconfig
)
3308 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3309 USB_REQ_SET_CONFIGURATION
, 0,
3310 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3311 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3314 "can't restore configuration #%d (error=%d)\n",
3315 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3318 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3320 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3321 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3322 struct usb_interface_descriptor
*desc
;
3324 /* set_interface resets host side toggle even
3325 * for altsetting zero. the interface may have no driver.
3327 desc
= &intf
->cur_altsetting
->desc
;
3328 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3329 desc
->bAlternateSetting
);
3331 dev_err(&udev
->dev
, "failed to restore interface %d "
3332 "altsetting %d (error=%d)\n",
3333 desc
->bInterfaceNumber
,
3334 desc
->bAlternateSetting
,
3344 hub_port_logical_disconnect(parent_hub
, port1
);
3349 * usb_reset_device - warn interface drivers and perform a USB port reset
3350 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3352 * Warns all drivers bound to registered interfaces (using their pre_reset
3353 * method), performs the port reset, and then lets the drivers know that
3354 * the reset is over (using their post_reset method).
3356 * Return value is the same as for usb_reset_and_verify_device().
3358 * The caller must own the device lock. For example, it's safe to use
3359 * this from a driver probe() routine after downloading new firmware.
3360 * For calls that might not occur during probe(), drivers should lock
3361 * the device using usb_lock_device_for_reset().
3363 * If an interface is currently being probed or disconnected, we assume
3364 * its driver knows how to handle resets. For all other interfaces,
3365 * if the driver doesn't have pre_reset and post_reset methods then
3366 * we attempt to unbind it and rebind afterward.
3368 int usb_reset_device(struct usb_device
*udev
)
3372 struct usb_host_config
*config
= udev
->actconfig
;
3374 if (udev
->state
== USB_STATE_NOTATTACHED
||
3375 udev
->state
== USB_STATE_SUSPENDED
) {
3376 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3381 /* Prevent autosuspend during the reset */
3382 usb_autoresume_device(udev
);
3385 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3386 struct usb_interface
*cintf
= config
->interface
[i
];
3387 struct usb_driver
*drv
;
3390 if (cintf
->dev
.driver
) {
3391 drv
= to_usb_driver(cintf
->dev
.driver
);
3392 if (drv
->pre_reset
&& drv
->post_reset
)
3393 unbind
= (drv
->pre_reset
)(cintf
);
3394 else if (cintf
->condition
==
3395 USB_INTERFACE_BOUND
)
3398 usb_forced_unbind_intf(cintf
);
3403 ret
= usb_reset_and_verify_device(udev
);
3406 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3407 struct usb_interface
*cintf
= config
->interface
[i
];
3408 struct usb_driver
*drv
;
3409 int rebind
= cintf
->needs_binding
;
3411 if (!rebind
&& cintf
->dev
.driver
) {
3412 drv
= to_usb_driver(cintf
->dev
.driver
);
3413 if (drv
->post_reset
)
3414 rebind
= (drv
->post_reset
)(cintf
);
3415 else if (cintf
->condition
==
3416 USB_INTERFACE_BOUND
)
3419 if (ret
== 0 && rebind
)
3420 usb_rebind_intf(cintf
);
3424 usb_autosuspend_device(udev
);
3427 EXPORT_SYMBOL_GPL(usb_reset_device
);
3431 * usb_queue_reset_device - Reset a USB device from an atomic context
3432 * @iface: USB interface belonging to the device to reset
3434 * This function can be used to reset a USB device from an atomic
3435 * context, where usb_reset_device() won't work (as it blocks).
3437 * Doing a reset via this method is functionally equivalent to calling
3438 * usb_reset_device(), except for the fact that it is delayed to a
3439 * workqueue. This means that any drivers bound to other interfaces
3440 * might be unbound, as well as users from usbfs in user space.
3444 * - Scheduling two resets at the same time from two different drivers
3445 * attached to two different interfaces of the same device is
3446 * possible; depending on how the driver attached to each interface
3447 * handles ->pre_reset(), the second reset might happen or not.
3449 * - If a driver is unbound and it had a pending reset, the reset will
3452 * - This function can be called during .probe() or .disconnect()
3453 * times. On return from .disconnect(), any pending resets will be
3456 * There is no no need to lock/unlock the @reset_ws as schedule_work()
3459 * NOTE: We don't do any reference count tracking because it is not
3460 * needed. The lifecycle of the work_struct is tied to the
3461 * usb_interface. Before destroying the interface we cancel the
3462 * work_struct, so the fact that work_struct is queued and or
3463 * running means the interface (and thus, the device) exist and
3466 void usb_queue_reset_device(struct usb_interface
*iface
)
3468 schedule_work(&iface
->reset_ws
);
3470 EXPORT_SYMBOL_GPL(usb_queue_reset_device
);