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/hcd.h>
23 #include <linux/usb/quirks.h>
24 #include <linux/kthread.h>
25 #include <linux/mutex.h>
26 #include <linux/freezer.h>
27 #include <linux/pm_runtime.h>
29 #include <asm/uaccess.h>
30 #include <asm/byteorder.h>
34 /* if we are in debug mode, always announce new devices */
36 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
37 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
42 struct device
*intfdev
; /* the "interface" device */
43 struct usb_device
*hdev
;
45 struct urb
*urb
; /* for interrupt polling pipe */
47 /* buffer for urb ... with extra space in case of babble */
50 struct usb_hub_status hub
;
51 struct usb_port_status port
;
52 } *status
; /* buffer for status reports */
53 struct mutex status_mutex
; /* for the status buffer */
55 int error
; /* last reported error */
56 int nerrors
; /* track consecutive errors */
58 struct list_head event_list
; /* hubs w/data or errs ready */
59 unsigned long event_bits
[1]; /* status change bitmask */
60 unsigned long change_bits
[1]; /* ports with logical connect
62 unsigned long busy_bits
[1]; /* ports being reset or
64 unsigned long removed_bits
[1]; /* ports with a "removed"
66 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
67 #error event_bits[] is too short!
70 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
71 struct usb_tt tt
; /* Transaction Translator */
73 unsigned mA_per_port
; /* current for each child */
75 unsigned limited_power
:1;
77 unsigned disconnected
:1;
79 unsigned has_indicators
:1;
80 u8 indicator
[USB_MAXCHILDREN
];
81 struct delayed_work leds
;
82 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 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
108 * 10 seconds to send reply for the initial 64-byte descriptor request.
110 /* define initial 64-byte descriptor request timeout in milliseconds */
111 static int initial_descriptor_timeout
= USB_CTRL_GET_TIMEOUT
;
112 module_param(initial_descriptor_timeout
, int, S_IRUGO
|S_IWUSR
);
113 MODULE_PARM_DESC(initial_descriptor_timeout
,
114 "initial 64-byte descriptor request timeout in milliseconds "
115 "(default 5000 - 5.0 seconds)");
118 * As of 2.6.10 we introduce a new USB device initialization scheme which
119 * closely resembles the way Windows works. Hopefully it will be compatible
120 * with a wider range of devices than the old scheme. However some previously
121 * working devices may start giving rise to "device not accepting address"
122 * errors; if that happens the user can try the old scheme by adjusting the
123 * following module parameters.
125 * For maximum flexibility there are two boolean parameters to control the
126 * hub driver's behavior. On the first initialization attempt, if the
127 * "old_scheme_first" parameter is set then the old scheme will be used,
128 * otherwise the new scheme is used. If that fails and "use_both_schemes"
129 * is set, then the driver will make another attempt, using the other scheme.
131 static int old_scheme_first
= 0;
132 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
133 MODULE_PARM_DESC(old_scheme_first
,
134 "start with the old device initialization scheme");
136 static int use_both_schemes
= 1;
137 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
138 MODULE_PARM_DESC(use_both_schemes
,
139 "try the other device initialization scheme if the "
142 /* Mutual exclusion for EHCI CF initialization. This interferes with
143 * port reset on some companion controllers.
145 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
146 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
148 #define HUB_DEBOUNCE_TIMEOUT 1500
149 #define HUB_DEBOUNCE_STEP 25
150 #define HUB_DEBOUNCE_STABLE 100
153 static int usb_reset_and_verify_device(struct usb_device
*udev
);
155 static inline char *portspeed(int portstatus
)
157 if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
159 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
161 else if (portstatus
& USB_PORT_STAT_SUPER_SPEED
)
167 /* Note that hdev or one of its children must be locked! */
168 static struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
170 if (!hdev
|| !hdev
->actconfig
)
172 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
175 /* USB 2.0 spec Section 11.24.4.5 */
176 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
180 for (i
= 0; i
< 3; i
++) {
181 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
182 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
183 USB_DT_HUB
<< 8, 0, data
, size
,
184 USB_CTRL_GET_TIMEOUT
);
185 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
192 * USB 2.0 spec Section 11.24.2.1
194 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
196 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
197 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
201 * USB 2.0 spec Section 11.24.2.2
203 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
205 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
206 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
211 * USB 2.0 spec Section 11.24.2.13
213 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
215 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
216 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
221 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
222 * for info about using port indicators
224 static void set_port_led(
230 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
231 USB_PORT_FEAT_INDICATOR
);
233 dev_dbg (hub
->intfdev
,
234 "port %d indicator %s status %d\n",
236 ({ char *s
; switch (selector
) {
237 case HUB_LED_AMBER
: s
= "amber"; break;
238 case HUB_LED_GREEN
: s
= "green"; break;
239 case HUB_LED_OFF
: s
= "off"; break;
240 case HUB_LED_AUTO
: s
= "auto"; break;
241 default: s
= "??"; break;
246 #define LED_CYCLE_PERIOD ((2*HZ)/3)
248 static void led_work (struct work_struct
*work
)
250 struct usb_hub
*hub
=
251 container_of(work
, struct usb_hub
, leds
.work
);
252 struct usb_device
*hdev
= hub
->hdev
;
254 unsigned changed
= 0;
257 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
260 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
261 unsigned selector
, mode
;
263 /* 30%-50% duty cycle */
265 switch (hub
->indicator
[i
]) {
267 case INDICATOR_CYCLE
:
269 selector
= HUB_LED_AUTO
;
270 mode
= INDICATOR_AUTO
;
272 /* blinking green = sw attention */
273 case INDICATOR_GREEN_BLINK
:
274 selector
= HUB_LED_GREEN
;
275 mode
= INDICATOR_GREEN_BLINK_OFF
;
277 case INDICATOR_GREEN_BLINK_OFF
:
278 selector
= HUB_LED_OFF
;
279 mode
= INDICATOR_GREEN_BLINK
;
281 /* blinking amber = hw attention */
282 case INDICATOR_AMBER_BLINK
:
283 selector
= HUB_LED_AMBER
;
284 mode
= INDICATOR_AMBER_BLINK_OFF
;
286 case INDICATOR_AMBER_BLINK_OFF
:
287 selector
= HUB_LED_OFF
;
288 mode
= INDICATOR_AMBER_BLINK
;
290 /* blink green/amber = reserved */
291 case INDICATOR_ALT_BLINK
:
292 selector
= HUB_LED_GREEN
;
293 mode
= INDICATOR_ALT_BLINK_OFF
;
295 case INDICATOR_ALT_BLINK_OFF
:
296 selector
= HUB_LED_AMBER
;
297 mode
= INDICATOR_ALT_BLINK
;
302 if (selector
!= HUB_LED_AUTO
)
304 set_port_led(hub
, i
+ 1, selector
);
305 hub
->indicator
[i
] = mode
;
307 if (!changed
&& blinkenlights
) {
309 cursor
%= hub
->descriptor
->bNbrPorts
;
310 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
311 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
315 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
318 /* use a short timeout for hub/port status fetches */
319 #define USB_STS_TIMEOUT 1000
320 #define USB_STS_RETRIES 5
323 * USB 2.0 spec Section 11.24.2.6
325 static int get_hub_status(struct usb_device
*hdev
,
326 struct usb_hub_status
*data
)
328 int i
, status
= -ETIMEDOUT
;
330 for (i
= 0; i
< USB_STS_RETRIES
&&
331 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
332 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
333 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
334 data
, sizeof(*data
), USB_STS_TIMEOUT
);
340 * USB 2.0 spec Section 11.24.2.7
342 static int get_port_status(struct usb_device
*hdev
, int port1
,
343 struct usb_port_status
*data
)
345 int i
, status
= -ETIMEDOUT
;
347 for (i
= 0; i
< USB_STS_RETRIES
&&
348 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
349 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
350 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
351 data
, sizeof(*data
), USB_STS_TIMEOUT
);
356 static int hub_port_status(struct usb_hub
*hub
, int port1
,
357 u16
*status
, u16
*change
)
361 mutex_lock(&hub
->status_mutex
);
362 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
364 dev_err(hub
->intfdev
,
365 "%s failed (err = %d)\n", __func__
, ret
);
369 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
370 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
373 mutex_unlock(&hub
->status_mutex
);
377 static void kick_khubd(struct usb_hub
*hub
)
381 spin_lock_irqsave(&hub_event_lock
, flags
);
382 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
383 list_add_tail(&hub
->event_list
, &hub_event_list
);
385 /* Suppress autosuspend until khubd runs */
386 usb_autopm_get_interface_no_resume(
387 to_usb_interface(hub
->intfdev
));
388 wake_up(&khubd_wait
);
390 spin_unlock_irqrestore(&hub_event_lock
, flags
);
393 void usb_kick_khubd(struct usb_device
*hdev
)
395 struct usb_hub
*hub
= hdev_to_hub(hdev
);
402 /* completion function, fires on port status changes and various faults */
403 static void hub_irq(struct urb
*urb
)
405 struct usb_hub
*hub
= urb
->context
;
406 int status
= urb
->status
;
411 case -ENOENT
: /* synchronous unlink */
412 case -ECONNRESET
: /* async unlink */
413 case -ESHUTDOWN
: /* hardware going away */
416 default: /* presumably an error */
417 /* Cause a hub reset after 10 consecutive errors */
418 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
419 if ((++hub
->nerrors
< 10) || hub
->error
)
424 /* let khubd handle things */
425 case 0: /* we got data: port status changed */
427 for (i
= 0; i
< urb
->actual_length
; ++i
)
428 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
430 hub
->event_bits
[0] = bits
;
436 /* Something happened, let khubd figure it out */
443 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
444 && status
!= -ENODEV
&& status
!= -EPERM
)
445 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
448 /* USB 2.0 spec Section 11.24.2.3 */
450 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
452 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
453 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
458 * enumeration blocks khubd for a long time. we use keventd instead, since
459 * long blocking there is the exception, not the rule. accordingly, HCDs
460 * talking to TTs must queue control transfers (not just bulk and iso), so
461 * both can talk to the same hub concurrently.
463 static void hub_tt_work(struct work_struct
*work
)
465 struct usb_hub
*hub
=
466 container_of(work
, struct usb_hub
, tt
.clear_work
);
470 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
471 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
472 struct list_head
*next
;
473 struct usb_tt_clear
*clear
;
474 struct usb_device
*hdev
= hub
->hdev
;
475 const struct hc_driver
*drv
;
478 next
= hub
->tt
.clear_list
.next
;
479 clear
= list_entry (next
, struct usb_tt_clear
, clear_list
);
480 list_del (&clear
->clear_list
);
482 /* drop lock so HCD can concurrently report other TT errors */
483 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
484 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
487 "clear tt %d (%04x) error %d\n",
488 clear
->tt
, clear
->devinfo
, status
);
490 /* Tell the HCD, even if the operation failed */
491 drv
= clear
->hcd
->driver
;
492 if (drv
->clear_tt_buffer_complete
)
493 (drv
->clear_tt_buffer_complete
)(clear
->hcd
, clear
->ep
);
496 spin_lock_irqsave(&hub
->tt
.lock
, flags
);
498 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
502 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
503 * @urb: an URB associated with the failed or incomplete split transaction
505 * High speed HCDs use this to tell the hub driver that some split control or
506 * bulk transaction failed in a way that requires clearing internal state of
507 * a transaction translator. This is normally detected (and reported) from
510 * It may not be possible for that hub to handle additional full (or low)
511 * speed transactions until that state is fully cleared out.
513 int usb_hub_clear_tt_buffer(struct urb
*urb
)
515 struct usb_device
*udev
= urb
->dev
;
516 int pipe
= urb
->pipe
;
517 struct usb_tt
*tt
= udev
->tt
;
519 struct usb_tt_clear
*clear
;
521 /* we've got to cope with an arbitrary number of pending TT clears,
522 * since each TT has "at least two" buffers that can need it (and
523 * there can be many TTs per hub). even if they're uncommon.
525 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
526 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
527 /* FIXME recover somehow ... RESET_TT? */
531 /* info that CLEAR_TT_BUFFER needs */
532 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
533 clear
->devinfo
= usb_pipeendpoint (pipe
);
534 clear
->devinfo
|= udev
->devnum
<< 4;
535 clear
->devinfo
|= usb_pipecontrol (pipe
)
536 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
537 : (USB_ENDPOINT_XFER_BULK
<< 11);
538 if (usb_pipein (pipe
))
539 clear
->devinfo
|= 1 << 15;
541 /* info for completion callback */
542 clear
->hcd
= bus_to_hcd(udev
->bus
);
545 /* tell keventd to clear state for this TT */
546 spin_lock_irqsave (&tt
->lock
, flags
);
547 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
548 schedule_work(&tt
->clear_work
);
549 spin_unlock_irqrestore (&tt
->lock
, flags
);
552 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer
);
554 /* If do_delay is false, return the number of milliseconds the caller
557 static unsigned hub_power_on(struct usb_hub
*hub
, bool do_delay
)
560 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
562 u16 wHubCharacteristics
=
563 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
565 /* Enable power on each port. Some hubs have reserved values
566 * of LPSM (> 2) in their descriptors, even though they are
567 * USB 2.0 hubs. Some hubs do not implement port-power switching
568 * but only emulate it. In all cases, the ports won't work
569 * unless we send these messages to the hub.
571 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
572 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
574 dev_dbg(hub
->intfdev
, "trying to enable port power on "
575 "non-switchable hub\n");
576 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
577 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
579 /* Wait at least 100 msec for power to become stable */
580 delay
= max(pgood_delay
, (unsigned) 100);
586 static int hub_hub_status(struct usb_hub
*hub
,
587 u16
*status
, u16
*change
)
591 mutex_lock(&hub
->status_mutex
);
592 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
594 dev_err (hub
->intfdev
,
595 "%s failed (err = %d)\n", __func__
, ret
);
597 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
598 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
601 mutex_unlock(&hub
->status_mutex
);
605 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
607 struct usb_device
*hdev
= hub
->hdev
;
610 if (hdev
->children
[port1
-1] && set_state
)
611 usb_set_device_state(hdev
->children
[port1
-1],
612 USB_STATE_NOTATTACHED
);
614 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
616 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
622 * Disable a port and mark a logical connnect-change event, so that some
623 * time later khubd will disconnect() any existing usb_device on the port
624 * and will re-enumerate if there actually is a device attached.
626 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
628 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
629 hub_port_disable(hub
, port1
, 1);
631 /* FIXME let caller ask to power down the port:
632 * - some devices won't enumerate without a VBUS power cycle
633 * - SRP saves power that way
634 * - ... new call, TBD ...
635 * That's easy if this hub can switch power per-port, and
636 * khubd reactivates the port later (timer, SRP, etc).
637 * Powerdown must be optional, because of reset/DFU.
640 set_bit(port1
, hub
->change_bits
);
645 * usb_remove_device - disable a device's port on its parent hub
646 * @udev: device to be disabled and removed
647 * Context: @udev locked, must be able to sleep.
649 * After @udev's port has been disabled, khubd is notified and it will
650 * see that the device has been disconnected. When the device is
651 * physically unplugged and something is plugged in, the events will
652 * be received and processed normally.
654 int usb_remove_device(struct usb_device
*udev
)
657 struct usb_interface
*intf
;
659 if (!udev
->parent
) /* Can't remove a root hub */
661 hub
= hdev_to_hub(udev
->parent
);
662 intf
= to_usb_interface(hub
->intfdev
);
664 usb_autopm_get_interface(intf
);
665 set_bit(udev
->portnum
, hub
->removed_bits
);
666 hub_port_logical_disconnect(hub
, udev
->portnum
);
667 usb_autopm_put_interface(intf
);
671 enum hub_activation_type
{
672 HUB_INIT
, HUB_INIT2
, HUB_INIT3
, /* INITs must come first */
673 HUB_POST_RESET
, HUB_RESUME
, HUB_RESET_RESUME
,
676 static void hub_init_func2(struct work_struct
*ws
);
677 static void hub_init_func3(struct work_struct
*ws
);
679 static void hub_activate(struct usb_hub
*hub
, enum hub_activation_type type
)
681 struct usb_device
*hdev
= hub
->hdev
;
686 bool need_debounce_delay
= false;
689 /* Continue a partial initialization */
690 if (type
== HUB_INIT2
)
692 if (type
== HUB_INIT3
)
695 /* After a resume, port power should still be on.
696 * For any other type of activation, turn it on.
698 if (type
!= HUB_RESUME
) {
700 /* Speed up system boot by using a delayed_work for the
701 * hub's initial power-up delays. This is pretty awkward
702 * and the implementation looks like a home-brewed sort of
703 * setjmp/longjmp, but it saves at least 100 ms for each
704 * root hub (assuming usbcore is compiled into the kernel
705 * rather than as a module). It adds up.
707 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
708 * because for those activation types the ports have to be
709 * operational when we return. In theory this could be done
710 * for HUB_POST_RESET, but it's easier not to.
712 if (type
== HUB_INIT
) {
713 delay
= hub_power_on(hub
, false);
714 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func2
);
715 schedule_delayed_work(&hub
->init_work
,
716 msecs_to_jiffies(delay
));
718 /* Suppress autosuspend until init is done */
719 usb_autopm_get_interface_no_resume(
720 to_usb_interface(hub
->intfdev
));
721 return; /* Continues at init2: below */
722 } else if (type
== HUB_RESET_RESUME
) {
723 /* The internal host controller state for the hub device
724 * may be gone after a host power loss on system resume.
725 * Update the device's info so the HW knows it's a hub.
727 hcd
= bus_to_hcd(hdev
->bus
);
728 if (hcd
->driver
->update_hub_device
) {
729 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
732 dev_err(hub
->intfdev
, "Host not "
733 "accepting hub info "
735 dev_err(hub
->intfdev
, "LS/FS devices "
736 "and hubs may not work "
737 "under this hub\n.");
740 hub_power_on(hub
, true);
742 hub_power_on(hub
, true);
747 /* Check each port and set hub->change_bits to let khubd know
748 * which ports need attention.
750 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
751 struct usb_device
*udev
= hdev
->children
[port1
-1];
752 u16 portstatus
, portchange
;
754 portstatus
= portchange
= 0;
755 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
756 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
757 dev_dbg(hub
->intfdev
,
758 "port %d: status %04x change %04x\n",
759 port1
, portstatus
, portchange
);
761 /* After anything other than HUB_RESUME (i.e., initialization
762 * or any sort of reset), every port should be disabled.
763 * Unconnected ports should likewise be disabled (paranoia),
764 * and so should ports for which we have no usb_device.
766 if ((portstatus
& USB_PORT_STAT_ENABLE
) && (
767 type
!= HUB_RESUME
||
768 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
770 udev
->state
== USB_STATE_NOTATTACHED
)) {
772 * USB3 protocol ports will automatically transition
773 * to Enabled state when detect an USB3.0 device attach.
774 * Do not disable USB3 protocol ports.
775 * FIXME: USB3 root hub and external hubs are treated
778 if (hdev
->descriptor
.bDeviceProtocol
!= 3 ||
780 !(portstatus
& USB_PORT_STAT_SUPER_SPEED
))) {
781 clear_port_feature(hdev
, port1
,
782 USB_PORT_FEAT_ENABLE
);
783 portstatus
&= ~USB_PORT_STAT_ENABLE
;
787 /* Clear status-change flags; we'll debounce later */
788 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
789 need_debounce_delay
= true;
790 clear_port_feature(hub
->hdev
, port1
,
791 USB_PORT_FEAT_C_CONNECTION
);
793 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
794 need_debounce_delay
= true;
795 clear_port_feature(hub
->hdev
, port1
,
796 USB_PORT_FEAT_C_ENABLE
);
799 /* We can forget about a "removed" device when there's a
800 * physical disconnect or the connect status changes.
802 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
803 (portchange
& USB_PORT_STAT_C_CONNECTION
))
804 clear_bit(port1
, hub
->removed_bits
);
806 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
807 /* Tell khubd to disconnect the device or
808 * check for a new connection
810 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
811 set_bit(port1
, hub
->change_bits
);
813 } else if (portstatus
& USB_PORT_STAT_ENABLE
) {
814 /* The power session apparently survived the resume.
815 * If there was an overcurrent or suspend change
816 * (i.e., remote wakeup request), have khubd
820 set_bit(port1
, hub
->change_bits
);
822 } else if (udev
->persist_enabled
) {
824 udev
->reset_resume
= 1;
826 set_bit(port1
, hub
->change_bits
);
829 /* The power session is gone; tell khubd */
830 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
831 set_bit(port1
, hub
->change_bits
);
835 /* If no port-status-change flags were set, we don't need any
836 * debouncing. If flags were set we can try to debounce the
837 * ports all at once right now, instead of letting khubd do them
838 * one at a time later on.
840 * If any port-status changes do occur during this delay, khubd
841 * will see them later and handle them normally.
843 if (need_debounce_delay
) {
844 delay
= HUB_DEBOUNCE_STABLE
;
846 /* Don't do a long sleep inside a workqueue routine */
847 if (type
== HUB_INIT2
) {
848 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func3
);
849 schedule_delayed_work(&hub
->init_work
,
850 msecs_to_jiffies(delay
));
851 return; /* Continues at init3: below */
859 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
861 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
862 if (hub
->has_indicators
&& blinkenlights
)
863 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
865 /* Scan all ports that need attention */
868 /* Allow autosuspend if it was suppressed */
869 if (type
<= HUB_INIT3
)
870 usb_autopm_put_interface_async(to_usb_interface(hub
->intfdev
));
873 /* Implement the continuations for the delays above */
874 static void hub_init_func2(struct work_struct
*ws
)
876 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
878 hub_activate(hub
, HUB_INIT2
);
881 static void hub_init_func3(struct work_struct
*ws
)
883 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
885 hub_activate(hub
, HUB_INIT3
);
888 enum hub_quiescing_type
{
889 HUB_DISCONNECT
, HUB_PRE_RESET
, HUB_SUSPEND
892 static void hub_quiesce(struct usb_hub
*hub
, enum hub_quiescing_type type
)
894 struct usb_device
*hdev
= hub
->hdev
;
897 cancel_delayed_work_sync(&hub
->init_work
);
899 /* khubd and related activity won't re-trigger */
902 if (type
!= HUB_SUSPEND
) {
903 /* Disconnect all the children */
904 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
905 if (hdev
->children
[i
])
906 usb_disconnect(&hdev
->children
[i
]);
910 /* Stop khubd and related activity */
911 usb_kill_urb(hub
->urb
);
912 if (hub
->has_indicators
)
913 cancel_delayed_work_sync(&hub
->leds
);
915 cancel_work_sync(&hub
->tt
.clear_work
);
918 /* caller has locked the hub device */
919 static int hub_pre_reset(struct usb_interface
*intf
)
921 struct usb_hub
*hub
= usb_get_intfdata(intf
);
923 hub_quiesce(hub
, HUB_PRE_RESET
);
927 /* caller has locked the hub device */
928 static int hub_post_reset(struct usb_interface
*intf
)
930 struct usb_hub
*hub
= usb_get_intfdata(intf
);
932 hub_activate(hub
, HUB_POST_RESET
);
936 static int hub_configure(struct usb_hub
*hub
,
937 struct usb_endpoint_descriptor
*endpoint
)
940 struct usb_device
*hdev
= hub
->hdev
;
941 struct device
*hub_dev
= hub
->intfdev
;
942 u16 hubstatus
, hubchange
;
943 u16 wHubCharacteristics
;
946 char *message
= "out of memory";
948 hub
->buffer
= kmalloc(sizeof(*hub
->buffer
), GFP_KERNEL
);
954 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
959 mutex_init(&hub
->status_mutex
);
961 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
962 if (!hub
->descriptor
) {
967 /* Request the entire hub descriptor.
968 * hub->descriptor can handle USB_MAXCHILDREN ports,
969 * but the hub can/will return fewer bytes here.
971 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
972 sizeof(*hub
->descriptor
));
974 message
= "can't read hub descriptor";
976 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
977 message
= "hub has too many ports!";
982 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
983 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
984 (hdev
->maxchild
== 1) ? "" : "s");
986 hub
->port_owners
= kzalloc(hdev
->maxchild
* sizeof(void *), GFP_KERNEL
);
987 if (!hub
->port_owners
) {
992 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
994 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
996 char portstr
[USB_MAXCHILDREN
+ 1];
998 for (i
= 0; i
< hdev
->maxchild
; i
++)
999 portstr
[i
] = hub
->descriptor
->DeviceRemovable
1000 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
1002 portstr
[hdev
->maxchild
] = 0;
1003 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
1005 dev_dbg(hub_dev
, "standalone hub\n");
1007 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
1009 dev_dbg(hub_dev
, "ganged power switching\n");
1012 dev_dbg(hub_dev
, "individual port power switching\n");
1016 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
1020 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
1022 dev_dbg(hub_dev
, "global over-current protection\n");
1025 dev_dbg(hub_dev
, "individual port over-current protection\n");
1029 dev_dbg(hub_dev
, "no over-current protection\n");
1033 spin_lock_init (&hub
->tt
.lock
);
1034 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
1035 INIT_WORK(&hub
->tt
.clear_work
, hub_tt_work
);
1036 switch (hdev
->descriptor
.bDeviceProtocol
) {
1040 dev_dbg(hub_dev
, "Single TT\n");
1044 ret
= usb_set_interface(hdev
, 0, 1);
1046 dev_dbg(hub_dev
, "TT per port\n");
1049 dev_err(hub_dev
, "Using single TT (err %d)\n",
1054 /* USB 3.0 hubs don't have a TT */
1057 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
1058 hdev
->descriptor
.bDeviceProtocol
);
1062 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1063 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
1064 case HUB_TTTT_8_BITS
:
1065 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
1066 hub
->tt
.think_time
= 666;
1067 dev_dbg(hub_dev
, "TT requires at most %d "
1068 "FS bit times (%d ns)\n",
1069 8, hub
->tt
.think_time
);
1072 case HUB_TTTT_16_BITS
:
1073 hub
->tt
.think_time
= 666 * 2;
1074 dev_dbg(hub_dev
, "TT requires at most %d "
1075 "FS bit times (%d ns)\n",
1076 16, hub
->tt
.think_time
);
1078 case HUB_TTTT_24_BITS
:
1079 hub
->tt
.think_time
= 666 * 3;
1080 dev_dbg(hub_dev
, "TT requires at most %d "
1081 "FS bit times (%d ns)\n",
1082 24, hub
->tt
.think_time
);
1084 case HUB_TTTT_32_BITS
:
1085 hub
->tt
.think_time
= 666 * 4;
1086 dev_dbg(hub_dev
, "TT requires at most %d "
1087 "FS bit times (%d ns)\n",
1088 32, hub
->tt
.think_time
);
1092 /* probe() zeroes hub->indicator[] */
1093 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
1094 hub
->has_indicators
= 1;
1095 dev_dbg(hub_dev
, "Port indicators are supported\n");
1098 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
1099 hub
->descriptor
->bPwrOn2PwrGood
* 2);
1101 /* power budgeting mostly matters with bus-powered hubs,
1102 * and battery-powered root hubs (may provide just 8 mA).
1104 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
1106 message
= "can't get hub status";
1109 le16_to_cpus(&hubstatus
);
1110 if (hdev
== hdev
->bus
->root_hub
) {
1111 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
1112 hub
->mA_per_port
= 500;
1114 hub
->mA_per_port
= hdev
->bus_mA
;
1115 hub
->limited_power
= 1;
1117 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
1118 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
1119 hub
->descriptor
->bHubContrCurrent
);
1120 hub
->limited_power
= 1;
1121 if (hdev
->maxchild
> 0) {
1122 int remaining
= hdev
->bus_mA
-
1123 hub
->descriptor
->bHubContrCurrent
;
1125 if (remaining
< hdev
->maxchild
* 100)
1127 "insufficient power available "
1128 "to use all downstream ports\n");
1129 hub
->mA_per_port
= 100; /* 7.2.1.1 */
1131 } else { /* Self-powered external hub */
1132 /* FIXME: What about battery-powered external hubs that
1133 * provide less current per port? */
1134 hub
->mA_per_port
= 500;
1136 if (hub
->mA_per_port
< 500)
1137 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
1140 /* Update the HCD's internal representation of this hub before khubd
1141 * starts getting port status changes for devices under the hub.
1143 hcd
= bus_to_hcd(hdev
->bus
);
1144 if (hcd
->driver
->update_hub_device
) {
1145 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1146 &hub
->tt
, GFP_KERNEL
);
1148 message
= "can't update HCD hub info";
1153 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
1155 message
= "can't get hub status";
1159 /* local power status reports aren't always correct */
1160 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
1161 dev_dbg(hub_dev
, "local power source is %s\n",
1162 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
1163 ? "lost (inactive)" : "good");
1165 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
1166 dev_dbg(hub_dev
, "%sover-current condition exists\n",
1167 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
1169 /* set up the interrupt endpoint
1170 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1171 * bytes as USB2.0[11.12.3] says because some hubs are known
1172 * to send more data (and thus cause overflow). For root hubs,
1173 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1174 * to be big enough for at least USB_MAXCHILDREN ports. */
1175 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
1176 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
1178 if (maxp
> sizeof(*hub
->buffer
))
1179 maxp
= sizeof(*hub
->buffer
);
1181 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
1187 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
1188 hub
, endpoint
->bInterval
);
1190 /* maybe cycle the hub leds */
1191 if (hub
->has_indicators
&& blinkenlights
)
1192 hub
->indicator
[0] = INDICATOR_CYCLE
;
1194 hub_activate(hub
, HUB_INIT
);
1198 dev_err (hub_dev
, "config failed, %s (err %d)\n",
1200 /* hub_disconnect() frees urb and descriptor */
1204 static void hub_release(struct kref
*kref
)
1206 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1208 usb_put_intf(to_usb_interface(hub
->intfdev
));
1212 static unsigned highspeed_hubs
;
1214 static void hub_disconnect(struct usb_interface
*intf
)
1216 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1218 /* Take the hub off the event list and don't let it be added again */
1219 spin_lock_irq(&hub_event_lock
);
1220 if (!list_empty(&hub
->event_list
)) {
1221 list_del_init(&hub
->event_list
);
1222 usb_autopm_put_interface_no_suspend(intf
);
1224 hub
->disconnected
= 1;
1225 spin_unlock_irq(&hub_event_lock
);
1227 /* Disconnect all children and quiesce the hub */
1229 hub_quiesce(hub
, HUB_DISCONNECT
);
1231 usb_set_intfdata (intf
, NULL
);
1232 hub
->hdev
->maxchild
= 0;
1234 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1237 usb_free_urb(hub
->urb
);
1238 kfree(hub
->port_owners
);
1239 kfree(hub
->descriptor
);
1243 kref_put(&hub
->kref
, hub_release
);
1246 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1248 struct usb_host_interface
*desc
;
1249 struct usb_endpoint_descriptor
*endpoint
;
1250 struct usb_device
*hdev
;
1251 struct usb_hub
*hub
;
1253 desc
= intf
->cur_altsetting
;
1254 hdev
= interface_to_usbdev(intf
);
1256 /* Hubs have proper suspend/resume support */
1257 usb_enable_autosuspend(hdev
);
1259 if (hdev
->level
== MAX_TOPO_LEVEL
) {
1261 "Unsupported bus topology: hub nested too deep\n");
1265 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1267 dev_warn(&intf
->dev
, "ignoring external hub\n");
1272 /* Some hubs have a subclass of 1, which AFAICT according to the */
1273 /* specs is not defined, but it works */
1274 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1275 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1277 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
1281 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1282 if (desc
->desc
.bNumEndpoints
!= 1)
1283 goto descriptor_error
;
1285 endpoint
= &desc
->endpoint
[0].desc
;
1287 /* If it's not an interrupt in endpoint, we'd better punt! */
1288 if (!usb_endpoint_is_int_in(endpoint
))
1289 goto descriptor_error
;
1291 /* We found a hub */
1292 dev_info (&intf
->dev
, "USB hub found\n");
1294 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1296 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1300 kref_init(&hub
->kref
);
1301 INIT_LIST_HEAD(&hub
->event_list
);
1302 hub
->intfdev
= &intf
->dev
;
1304 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1305 INIT_DELAYED_WORK(&hub
->init_work
, NULL
);
1308 usb_set_intfdata (intf
, hub
);
1309 intf
->needs_remote_wakeup
= 1;
1311 if (hdev
->speed
== USB_SPEED_HIGH
)
1314 if (hub_configure(hub
, endpoint
) >= 0)
1317 hub_disconnect (intf
);
1322 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1324 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1326 /* assert ifno == 0 (part of hub spec) */
1328 case USBDEVFS_HUB_PORTINFO
: {
1329 struct usbdevfs_hub_portinfo
*info
= user_data
;
1332 spin_lock_irq(&device_state_lock
);
1333 if (hdev
->devnum
<= 0)
1336 info
->nports
= hdev
->maxchild
;
1337 for (i
= 0; i
< info
->nports
; i
++) {
1338 if (hdev
->children
[i
] == NULL
)
1342 hdev
->children
[i
]->devnum
;
1345 spin_unlock_irq(&device_state_lock
);
1347 return info
->nports
+ 1;
1356 * Allow user programs to claim ports on a hub. When a device is attached
1357 * to one of these "claimed" ports, the program will "own" the device.
1359 static int find_port_owner(struct usb_device
*hdev
, unsigned port1
,
1362 if (hdev
->state
== USB_STATE_NOTATTACHED
)
1364 if (port1
== 0 || port1
> hdev
->maxchild
)
1367 /* This assumes that devices not managed by the hub driver
1368 * will always have maxchild equal to 0.
1370 *ppowner
= &(hdev_to_hub(hdev
)->port_owners
[port1
- 1]);
1374 /* In the following three functions, the caller must hold hdev's lock */
1375 int usb_hub_claim_port(struct usb_device
*hdev
, unsigned port1
, void *owner
)
1380 rc
= find_port_owner(hdev
, port1
, &powner
);
1389 int usb_hub_release_port(struct usb_device
*hdev
, unsigned port1
, void *owner
)
1394 rc
= find_port_owner(hdev
, port1
, &powner
);
1397 if (*powner
!= owner
)
1403 void usb_hub_release_all_ports(struct usb_device
*hdev
, void *owner
)
1408 n
= find_port_owner(hdev
, 1, &powner
);
1410 for (; n
< hdev
->maxchild
; (++n
, ++powner
)) {
1411 if (*powner
== owner
)
1417 /* The caller must hold udev's lock */
1418 bool usb_device_is_owned(struct usb_device
*udev
)
1420 struct usb_hub
*hub
;
1422 if (udev
->state
== USB_STATE_NOTATTACHED
|| !udev
->parent
)
1424 hub
= hdev_to_hub(udev
->parent
);
1425 return !!hub
->port_owners
[udev
->portnum
- 1];
1429 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1433 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1434 if (udev
->children
[i
])
1435 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1437 if (udev
->state
== USB_STATE_SUSPENDED
)
1438 udev
->active_duration
-= jiffies
;
1439 udev
->state
= USB_STATE_NOTATTACHED
;
1443 * usb_set_device_state - change a device's current state (usbcore, hcds)
1444 * @udev: pointer to device whose state should be changed
1445 * @new_state: new state value to be stored
1447 * udev->state is _not_ fully protected by the device lock. Although
1448 * most transitions are made only while holding the lock, the state can
1449 * can change to USB_STATE_NOTATTACHED at almost any time. This
1450 * is so that devices can be marked as disconnected as soon as possible,
1451 * without having to wait for any semaphores to be released. As a result,
1452 * all changes to any device's state must be protected by the
1453 * device_state_lock spinlock.
1455 * Once a device has been added to the device tree, all changes to its state
1456 * should be made using this routine. The state should _not_ be set directly.
1458 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1459 * Otherwise udev->state is set to new_state, and if new_state is
1460 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1461 * to USB_STATE_NOTATTACHED.
1463 void usb_set_device_state(struct usb_device
*udev
,
1464 enum usb_device_state new_state
)
1466 unsigned long flags
;
1468 spin_lock_irqsave(&device_state_lock
, flags
);
1469 if (udev
->state
== USB_STATE_NOTATTACHED
)
1471 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1473 /* root hub wakeup capabilities are managed out-of-band
1474 * and may involve silicon errata ... ignore them here.
1477 if (udev
->state
== USB_STATE_SUSPENDED
1478 || new_state
== USB_STATE_SUSPENDED
)
1479 ; /* No change to wakeup settings */
1480 else if (new_state
== USB_STATE_CONFIGURED
)
1481 device_set_wakeup_capable(&udev
->dev
,
1482 (udev
->actconfig
->desc
.bmAttributes
1483 & USB_CONFIG_ATT_WAKEUP
));
1485 device_set_wakeup_capable(&udev
->dev
, 0);
1487 if (udev
->state
== USB_STATE_SUSPENDED
&&
1488 new_state
!= USB_STATE_SUSPENDED
)
1489 udev
->active_duration
-= jiffies
;
1490 else if (new_state
== USB_STATE_SUSPENDED
&&
1491 udev
->state
!= USB_STATE_SUSPENDED
)
1492 udev
->active_duration
+= jiffies
;
1493 udev
->state
= new_state
;
1495 recursively_mark_NOTATTACHED(udev
);
1496 spin_unlock_irqrestore(&device_state_lock
, flags
);
1498 EXPORT_SYMBOL_GPL(usb_set_device_state
);
1501 * WUSB devices are simple: they have no hubs behind, so the mapping
1502 * device <-> virtual port number becomes 1:1. Why? to simplify the
1503 * life of the device connection logic in
1504 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1505 * handshake we need to assign a temporary address in the unauthorized
1506 * space. For simplicity we use the first virtual port number found to
1507 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1508 * and that becomes it's address [X < 128] or its unauthorized address
1511 * We add 1 as an offset to the one-based USB-stack port number
1512 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1513 * 0 is reserved by USB for default address; (b) Linux's USB stack
1514 * uses always #1 for the root hub of the controller. So USB stack's
1515 * port #1, which is wusb virtual-port #0 has address #2.
1517 * Devices connected under xHCI are not as simple. The host controller
1518 * supports virtualization, so the hardware assigns device addresses and
1519 * the HCD must setup data structures before issuing a set address
1520 * command to the hardware.
1522 static void choose_address(struct usb_device
*udev
)
1525 struct usb_bus
*bus
= udev
->bus
;
1527 /* If khubd ever becomes multithreaded, this will need a lock */
1529 devnum
= udev
->portnum
+ 1;
1530 BUG_ON(test_bit(devnum
, bus
->devmap
.devicemap
));
1532 /* Try to allocate the next devnum beginning at
1533 * bus->devnum_next. */
1534 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1537 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
,
1539 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1542 set_bit(devnum
, bus
->devmap
.devicemap
);
1543 udev
->devnum
= devnum
;
1547 static void release_address(struct usb_device
*udev
)
1549 if (udev
->devnum
> 0) {
1550 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1555 static void update_address(struct usb_device
*udev
, int devnum
)
1557 /* The address for a WUSB device is managed by wusbcore. */
1559 udev
->devnum
= devnum
;
1562 static void hub_free_dev(struct usb_device
*udev
)
1564 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
1566 /* Root hubs aren't real devices, so don't free HCD resources */
1567 if (hcd
->driver
->free_dev
&& udev
->parent
)
1568 hcd
->driver
->free_dev(hcd
, udev
);
1572 * usb_disconnect - disconnect a device (usbcore-internal)
1573 * @pdev: pointer to device being disconnected
1574 * Context: !in_interrupt ()
1576 * Something got disconnected. Get rid of it and all of its children.
1578 * If *pdev is a normal device then the parent hub must already be locked.
1579 * If *pdev is a root hub then this routine will acquire the
1580 * usb_bus_list_lock on behalf of the caller.
1582 * Only hub drivers (including virtual root hub drivers for host
1583 * controllers) should ever call this.
1585 * This call is synchronous, and may not be used in an interrupt context.
1587 void usb_disconnect(struct usb_device
**pdev
)
1589 struct usb_device
*udev
= *pdev
;
1593 pr_debug ("%s nodev\n", __func__
);
1597 /* mark the device as inactive, so any further urb submissions for
1598 * this device (and any of its children) will fail immediately.
1599 * this quiesces everyting except pending urbs.
1601 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1602 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1604 usb_lock_device(udev
);
1606 /* Free up all the children before we remove this device */
1607 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1608 if (udev
->children
[i
])
1609 usb_disconnect(&udev
->children
[i
]);
1612 /* deallocate hcd/hardware state ... nuking all pending urbs and
1613 * cleaning up all state associated with the current configuration
1614 * so that the hardware is now fully quiesced.
1616 dev_dbg (&udev
->dev
, "unregistering device\n");
1617 usb_disable_device(udev
, 0);
1618 usb_hcd_synchronize_unlinks(udev
);
1620 usb_remove_ep_devs(&udev
->ep0
);
1621 usb_unlock_device(udev
);
1623 /* Unregister the device. The device driver is responsible
1624 * for de-configuring the device and invoking the remove-device
1625 * notifier chain (used by usbfs and possibly others).
1627 device_del(&udev
->dev
);
1629 /* Free the device number and delete the parent's children[]
1630 * (or root_hub) pointer.
1632 release_address(udev
);
1634 /* Avoid races with recursively_mark_NOTATTACHED() */
1635 spin_lock_irq(&device_state_lock
);
1637 spin_unlock_irq(&device_state_lock
);
1641 put_device(&udev
->dev
);
1644 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1645 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1649 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1652 static void announce_device(struct usb_device
*udev
)
1654 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1655 le16_to_cpu(udev
->descriptor
.idVendor
),
1656 le16_to_cpu(udev
->descriptor
.idProduct
));
1657 dev_info(&udev
->dev
,
1658 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1659 udev
->descriptor
.iManufacturer
,
1660 udev
->descriptor
.iProduct
,
1661 udev
->descriptor
.iSerialNumber
);
1662 show_string(udev
, "Product", udev
->product
);
1663 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1664 show_string(udev
, "SerialNumber", udev
->serial
);
1667 static inline void announce_device(struct usb_device
*udev
) { }
1670 #ifdef CONFIG_USB_OTG
1671 #include "otg_whitelist.h"
1675 * usb_enumerate_device_otg - FIXME (usbcore-internal)
1676 * @udev: newly addressed device (in ADDRESS state)
1678 * Finish enumeration for On-The-Go devices
1680 static int usb_enumerate_device_otg(struct usb_device
*udev
)
1684 #ifdef CONFIG_USB_OTG
1686 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1687 * to wake us after we've powered off VBUS; and HNP, switching roles
1688 * "host" to "peripheral". The OTG descriptor helps figure this out.
1690 if (!udev
->bus
->is_b_host
1692 && udev
->parent
== udev
->bus
->root_hub
) {
1693 struct usb_otg_descriptor
*desc
= NULL
;
1694 struct usb_bus
*bus
= udev
->bus
;
1696 /* descriptor may appear anywhere in config */
1697 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1698 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1699 USB_DT_OTG
, (void **) &desc
) == 0) {
1700 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1701 unsigned port1
= udev
->portnum
;
1703 dev_info(&udev
->dev
,
1704 "Dual-Role OTG device on %sHNP port\n",
1705 (port1
== bus
->otg_port
)
1708 /* enable HNP before suspend, it's simpler */
1709 if (port1
== bus
->otg_port
)
1710 bus
->b_hnp_enable
= 1;
1711 err
= usb_control_msg(udev
,
1712 usb_sndctrlpipe(udev
, 0),
1713 USB_REQ_SET_FEATURE
, 0,
1715 ? USB_DEVICE_B_HNP_ENABLE
1716 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1717 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1719 /* OTG MESSAGE: report errors here,
1720 * customize to match your product.
1722 dev_info(&udev
->dev
,
1723 "can't set HNP mode: %d\n",
1725 bus
->b_hnp_enable
= 0;
1731 if (!is_targeted(udev
)) {
1733 /* Maybe it can talk to us, though we can't talk to it.
1734 * (Includes HNP test device.)
1736 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1737 err
= usb_port_suspend(udev
, PMSG_SUSPEND
);
1739 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1751 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
1752 * @udev: newly addressed device (in ADDRESS state)
1754 * This is only called by usb_new_device() and usb_authorize_device()
1755 * and FIXME -- all comments that apply to them apply here wrt to
1758 * If the device is WUSB and not authorized, we don't attempt to read
1759 * the string descriptors, as they will be errored out by the device
1760 * until it has been authorized.
1762 static int usb_enumerate_device(struct usb_device
*udev
)
1766 if (udev
->config
== NULL
) {
1767 err
= usb_get_configuration(udev
);
1769 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1774 if (udev
->wusb
== 1 && udev
->authorized
== 0) {
1775 udev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1776 udev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1777 udev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1780 /* read the standard strings and cache them if present */
1781 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1782 udev
->manufacturer
= usb_cache_string(udev
,
1783 udev
->descriptor
.iManufacturer
);
1784 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1786 err
= usb_enumerate_device_otg(udev
);
1793 * usb_new_device - perform initial device setup (usbcore-internal)
1794 * @udev: newly addressed device (in ADDRESS state)
1796 * This is called with devices which have been detected but not fully
1797 * enumerated. The device descriptor is available, but not descriptors
1798 * for any device configuration. The caller must have locked either
1799 * the parent hub (if udev is a normal device) or else the
1800 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1801 * udev has already been installed, but udev is not yet visible through
1802 * sysfs or other filesystem code.
1804 * It will return if the device is configured properly or not. Zero if
1805 * the interface was registered with the driver core; else a negative
1808 * This call is synchronous, and may not be used in an interrupt context.
1810 * Only the hub driver or root-hub registrar should ever call this.
1812 int usb_new_device(struct usb_device
*udev
)
1817 /* Initialize non-root-hub device wakeup to disabled;
1818 * device (un)configuration controls wakeup capable
1819 * sysfs power/wakeup controls wakeup enabled/disabled
1821 device_init_wakeup(&udev
->dev
, 0);
1824 /* Tell the runtime-PM framework the device is active */
1825 pm_runtime_set_active(&udev
->dev
);
1826 pm_runtime_enable(&udev
->dev
);
1828 err
= usb_enumerate_device(udev
); /* Read descriptors */
1831 dev_dbg(&udev
->dev
, "udev %d, busnum %d, minor = %d\n",
1832 udev
->devnum
, udev
->bus
->busnum
,
1833 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1834 /* export the usbdev device-node for libusb */
1835 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1836 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1838 /* Tell the world! */
1839 announce_device(udev
);
1841 device_enable_async_suspend(&udev
->dev
);
1842 /* Register the device. The device driver is responsible
1843 * for configuring the device and invoking the add-device
1844 * notifier chain (used by usbfs and possibly others).
1846 err
= device_add(&udev
->dev
);
1848 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1852 (void) usb_create_ep_devs(&udev
->dev
, &udev
->ep0
, udev
);
1856 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1857 pm_runtime_disable(&udev
->dev
);
1858 pm_runtime_set_suspended(&udev
->dev
);
1864 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1865 * @usb_dev: USB device
1867 * Move the USB device to a very basic state where interfaces are disabled
1868 * and the device is in fact unconfigured and unusable.
1870 * We share a lock (that we have) with device_del(), so we need to
1873 int usb_deauthorize_device(struct usb_device
*usb_dev
)
1875 usb_lock_device(usb_dev
);
1876 if (usb_dev
->authorized
== 0)
1877 goto out_unauthorized
;
1879 usb_dev
->authorized
= 0;
1880 usb_set_configuration(usb_dev
, -1);
1882 kfree(usb_dev
->product
);
1883 usb_dev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1884 kfree(usb_dev
->manufacturer
);
1885 usb_dev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1886 kfree(usb_dev
->serial
);
1887 usb_dev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1889 usb_destroy_configuration(usb_dev
);
1890 usb_dev
->descriptor
.bNumConfigurations
= 0;
1893 usb_unlock_device(usb_dev
);
1898 int usb_authorize_device(struct usb_device
*usb_dev
)
1902 usb_lock_device(usb_dev
);
1903 if (usb_dev
->authorized
== 1)
1904 goto out_authorized
;
1906 result
= usb_autoresume_device(usb_dev
);
1908 dev_err(&usb_dev
->dev
,
1909 "can't autoresume for authorization: %d\n", result
);
1910 goto error_autoresume
;
1912 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
1914 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
1915 "authorization: %d\n", result
);
1916 goto error_device_descriptor
;
1919 kfree(usb_dev
->product
);
1920 usb_dev
->product
= NULL
;
1921 kfree(usb_dev
->manufacturer
);
1922 usb_dev
->manufacturer
= NULL
;
1923 kfree(usb_dev
->serial
);
1924 usb_dev
->serial
= NULL
;
1926 usb_dev
->authorized
= 1;
1927 result
= usb_enumerate_device(usb_dev
);
1929 goto error_enumerate
;
1930 /* Choose and set the configuration. This registers the interfaces
1931 * with the driver core and lets interface drivers bind to them.
1933 c
= usb_choose_configuration(usb_dev
);
1935 result
= usb_set_configuration(usb_dev
, c
);
1937 dev_err(&usb_dev
->dev
,
1938 "can't set config #%d, error %d\n", c
, result
);
1939 /* This need not be fatal. The user can try to
1940 * set other configurations. */
1943 dev_info(&usb_dev
->dev
, "authorized to connect\n");
1946 error_device_descriptor
:
1947 usb_autosuspend_device(usb_dev
);
1950 usb_unlock_device(usb_dev
); // complements locktree
1955 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1956 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1958 struct usb_hcd
*hcd
;
1959 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1961 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1962 return hcd
->wireless
;
1966 #define PORT_RESET_TRIES 5
1967 #define SET_ADDRESS_TRIES 2
1968 #define GET_DESCRIPTOR_TRIES 2
1969 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1970 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1972 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1973 #define HUB_SHORT_RESET_TIME 10
1974 #define HUB_LONG_RESET_TIME 200
1975 #define HUB_RESET_TIMEOUT 500
1977 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1978 struct usb_device
*udev
, unsigned int delay
)
1980 int delay_time
, ret
;
1984 for (delay_time
= 0;
1985 delay_time
< HUB_RESET_TIMEOUT
;
1986 delay_time
+= delay
) {
1987 /* wait to give the device a chance to reset */
1990 /* read and decode port status */
1991 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1995 /* Device went away? */
1996 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1999 /* bomb out completely if the connection bounced */
2000 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
2003 /* if we`ve finished resetting, then break out of the loop */
2004 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
2005 (portstatus
& USB_PORT_STAT_ENABLE
)) {
2006 if (hub_is_wusb(hub
))
2007 udev
->speed
= USB_SPEED_WIRELESS
;
2008 else if (portstatus
& USB_PORT_STAT_SUPER_SPEED
)
2009 udev
->speed
= USB_SPEED_SUPER
;
2010 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
2011 udev
->speed
= USB_SPEED_HIGH
;
2012 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
2013 udev
->speed
= USB_SPEED_LOW
;
2015 udev
->speed
= USB_SPEED_FULL
;
2019 /* switch to the long delay after two short delay failures */
2020 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
2021 delay
= HUB_LONG_RESET_TIME
;
2023 dev_dbg (hub
->intfdev
,
2024 "port %d not reset yet, waiting %dms\n",
2031 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
2032 struct usb_device
*udev
, unsigned int delay
)
2035 struct usb_hcd
*hcd
;
2037 hcd
= bus_to_hcd(udev
->bus
);
2038 /* Block EHCI CF initialization during the port reset.
2039 * Some companion controllers don't like it when they mix.
2041 down_read(&ehci_cf_port_reset_rwsem
);
2043 /* Reset the port */
2044 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
2045 status
= set_port_feature(hub
->hdev
,
2046 port1
, USB_PORT_FEAT_RESET
);
2048 dev_err(hub
->intfdev
,
2049 "cannot reset port %d (err = %d)\n",
2052 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
2053 if (status
&& status
!= -ENOTCONN
)
2054 dev_dbg(hub
->intfdev
,
2055 "port_wait_reset: err = %d\n",
2059 /* return on disconnect or reset */
2062 /* TRSTRCY = 10 ms; plus some extra */
2064 update_address(udev
, 0);
2065 if (hcd
->driver
->reset_device
) {
2066 status
= hcd
->driver
->reset_device(hcd
, udev
);
2068 dev_err(&udev
->dev
, "Cannot reset "
2069 "HCD device state\n");
2076 clear_port_feature(hub
->hdev
,
2077 port1
, USB_PORT_FEAT_C_RESET
);
2078 /* FIXME need disconnect() for NOTATTACHED device */
2079 usb_set_device_state(udev
, status
2080 ? USB_STATE_NOTATTACHED
2081 : USB_STATE_DEFAULT
);
2085 dev_dbg (hub
->intfdev
,
2086 "port %d not enabled, trying reset again...\n",
2088 delay
= HUB_LONG_RESET_TIME
;
2091 dev_err (hub
->intfdev
,
2092 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2096 up_read(&ehci_cf_port_reset_rwsem
);
2102 #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
2103 USB_PORT_STAT_SUSPEND)
2104 #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
2106 /* Determine whether the device on a port is ready for a normal resume,
2107 * is ready for a reset-resume, or should be disconnected.
2109 static int check_port_resume_type(struct usb_device
*udev
,
2110 struct usb_hub
*hub
, int port1
,
2111 int status
, unsigned portchange
, unsigned portstatus
)
2113 /* Is the device still present? */
2114 if (status
|| (portstatus
& MASK_BITS
) != WANT_BITS
) {
2119 /* Can't do a normal resume if the port isn't enabled,
2120 * so try a reset-resume instead.
2122 else if (!(portstatus
& USB_PORT_STAT_ENABLE
) && !udev
->reset_resume
) {
2123 if (udev
->persist_enabled
)
2124 udev
->reset_resume
= 1;
2130 dev_dbg(hub
->intfdev
,
2131 "port %d status %04x.%04x after resume, %d\n",
2132 port1
, portchange
, portstatus
, status
);
2133 } else if (udev
->reset_resume
) {
2135 /* Late port handoff can set status-change bits */
2136 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
2137 clear_port_feature(hub
->hdev
, port1
,
2138 USB_PORT_FEAT_C_CONNECTION
);
2139 if (portchange
& USB_PORT_STAT_C_ENABLE
)
2140 clear_port_feature(hub
->hdev
, port1
,
2141 USB_PORT_FEAT_C_ENABLE
);
2147 #ifdef CONFIG_USB_SUSPEND
2150 * usb_port_suspend - suspend a usb device's upstream port
2151 * @udev: device that's no longer in active use, not a root hub
2152 * Context: must be able to sleep; device not locked; pm locks held
2154 * Suspends a USB device that isn't in active use, conserving power.
2155 * Devices may wake out of a suspend, if anything important happens,
2156 * using the remote wakeup mechanism. They may also be taken out of
2157 * suspend by the host, using usb_port_resume(). It's also routine
2158 * to disconnect devices while they are suspended.
2160 * This only affects the USB hardware for a device; its interfaces
2161 * (and, for hubs, child devices) must already have been suspended.
2163 * Selective port suspend reduces power; most suspended devices draw
2164 * less than 500 uA. It's also used in OTG, along with remote wakeup.
2165 * All devices below the suspended port are also suspended.
2167 * Devices leave suspend state when the host wakes them up. Some devices
2168 * also support "remote wakeup", where the device can activate the USB
2169 * tree above them to deliver data, such as a keypress or packet. In
2170 * some cases, this wakes the USB host.
2172 * Suspending OTG devices may trigger HNP, if that's been enabled
2173 * between a pair of dual-role devices. That will change roles, such
2174 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2176 * Devices on USB hub ports have only one "suspend" state, corresponding
2177 * to ACPI D2, "may cause the device to lose some context".
2178 * State transitions include:
2180 * - suspend, resume ... when the VBUS power link stays live
2181 * - suspend, disconnect ... VBUS lost
2183 * Once VBUS drop breaks the circuit, the port it's using has to go through
2184 * normal re-enumeration procedures, starting with enabling VBUS power.
2185 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2186 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
2187 * timer, no SRP, no requests through sysfs.
2189 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
2190 * the root hub for their bus goes into global suspend ... so we don't
2191 * (falsely) update the device power state to say it suspended.
2193 * Returns 0 on success, else negative errno.
2195 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
2197 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2198 int port1
= udev
->portnum
;
2201 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
2203 /* enable remote wakeup when appropriate; this lets the device
2204 * wake up the upstream hub (including maybe the root hub).
2206 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
2207 * we don't explicitly enable it here.
2209 if (udev
->do_remote_wakeup
) {
2210 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2211 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
2212 USB_DEVICE_REMOTE_WAKEUP
, 0,
2214 USB_CTRL_SET_TIMEOUT
);
2216 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
2218 /* bail if autosuspend is requested */
2219 if (msg
.event
& PM_EVENT_AUTO
)
2225 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
2227 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
2229 /* paranoia: "should not happen" */
2230 if (udev
->do_remote_wakeup
)
2231 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2232 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
2233 USB_DEVICE_REMOTE_WAKEUP
, 0,
2235 USB_CTRL_SET_TIMEOUT
);
2237 /* System sleep transitions should never fail */
2238 if (!(msg
.event
& PM_EVENT_AUTO
))
2241 /* device has up to 10 msec to fully suspend */
2242 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
2243 (msg
.event
& PM_EVENT_AUTO
? "auto-" : ""));
2244 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
2251 * If the USB "suspend" state is in use (rather than "global suspend"),
2252 * many devices will be individually taken out of suspend state using
2253 * special "resume" signaling. This routine kicks in shortly after
2254 * hardware resume signaling is finished, either because of selective
2255 * resume (by host) or remote wakeup (by device) ... now see what changed
2256 * in the tree that's rooted at this device.
2258 * If @udev->reset_resume is set then the device is reset before the
2259 * status check is done.
2261 static int finish_port_resume(struct usb_device
*udev
)
2266 /* caller owns the udev device lock */
2267 dev_dbg(&udev
->dev
, "%s\n",
2268 udev
->reset_resume
? "finish reset-resume" : "finish resume");
2270 /* usb ch9 identifies four variants of SUSPENDED, based on what
2271 * state the device resumes to. Linux currently won't see the
2272 * first two on the host side; they'd be inside hub_port_init()
2273 * during many timeouts, but khubd can't suspend until later.
2275 usb_set_device_state(udev
, udev
->actconfig
2276 ? USB_STATE_CONFIGURED
2277 : USB_STATE_ADDRESS
);
2279 /* 10.5.4.5 says not to reset a suspended port if the attached
2280 * device is enabled for remote wakeup. Hence the reset
2281 * operation is carried out here, after the port has been
2284 if (udev
->reset_resume
)
2286 status
= usb_reset_and_verify_device(udev
);
2288 /* 10.5.4.5 says be sure devices in the tree are still there.
2289 * For now let's assume the device didn't go crazy on resume,
2290 * and device drivers will know about any resume quirks.
2294 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
2296 status
= (status
> 0 ? 0 : -ENODEV
);
2298 /* If a normal resume failed, try doing a reset-resume */
2299 if (status
&& !udev
->reset_resume
&& udev
->persist_enabled
) {
2300 dev_dbg(&udev
->dev
, "retry with reset-resume\n");
2301 udev
->reset_resume
= 1;
2302 goto retry_reset_resume
;
2307 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
2309 } else if (udev
->actconfig
) {
2310 le16_to_cpus(&devstatus
);
2311 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
2312 status
= usb_control_msg(udev
,
2313 usb_sndctrlpipe(udev
, 0),
2314 USB_REQ_CLEAR_FEATURE
,
2316 USB_DEVICE_REMOTE_WAKEUP
, 0,
2318 USB_CTRL_SET_TIMEOUT
);
2321 "disable remote wakeup, status %d\n",
2330 * usb_port_resume - re-activate a suspended usb device's upstream port
2331 * @udev: device to re-activate, not a root hub
2332 * Context: must be able to sleep; device not locked; pm locks held
2334 * This will re-activate the suspended device, increasing power usage
2335 * while letting drivers communicate again with its endpoints.
2336 * USB resume explicitly guarantees that the power session between
2337 * the host and the device is the same as it was when the device
2340 * If @udev->reset_resume is set then this routine won't check that the
2341 * port is still enabled. Furthermore, finish_port_resume() above will
2342 * reset @udev. The end result is that a broken power session can be
2343 * recovered and @udev will appear to persist across a loss of VBUS power.
2345 * For example, if a host controller doesn't maintain VBUS suspend current
2346 * during a system sleep or is reset when the system wakes up, all the USB
2347 * power sessions below it will be broken. This is especially troublesome
2348 * for mass-storage devices containing mounted filesystems, since the
2349 * device will appear to have disconnected and all the memory mappings
2350 * to it will be lost. Using the USB_PERSIST facility, the device can be
2351 * made to appear as if it had not disconnected.
2353 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
2354 * every effort to insure that the same device is present after the
2355 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2356 * quite possible for a device to remain unaltered but its media to be
2357 * changed. If the user replaces a flash memory card while the system is
2358 * asleep, he will have only himself to blame when the filesystem on the
2359 * new card is corrupted and the system crashes.
2361 * Returns 0 on success, else negative errno.
2363 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
2365 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2366 int port1
= udev
->portnum
;
2368 u16 portchange
, portstatus
;
2370 /* Skip the initial Clear-Suspend step for a remote wakeup */
2371 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2372 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
2373 goto SuspendCleared
;
2375 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2377 set_bit(port1
, hub
->busy_bits
);
2379 /* see 7.1.7.7; affects power usage, but not budgeting */
2380 status
= clear_port_feature(hub
->hdev
,
2381 port1
, USB_PORT_FEAT_SUSPEND
);
2383 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
2386 /* drive resume for at least 20 msec */
2387 dev_dbg(&udev
->dev
, "usb %sresume\n",
2388 (msg
.event
& PM_EVENT_AUTO
? "auto-" : ""));
2391 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2392 * stop resume signaling. Then finish the resume
2395 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2397 /* TRSMRCY = 10 msec */
2403 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
2404 clear_port_feature(hub
->hdev
, port1
,
2405 USB_PORT_FEAT_C_SUSPEND
);
2408 clear_bit(port1
, hub
->busy_bits
);
2410 status
= check_port_resume_type(udev
,
2411 hub
, port1
, status
, portchange
, portstatus
);
2413 status
= finish_port_resume(udev
);
2415 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2416 hub_port_logical_disconnect(hub
, port1
);
2421 /* caller has locked udev */
2422 int usb_remote_wakeup(struct usb_device
*udev
)
2426 if (udev
->state
== USB_STATE_SUSPENDED
) {
2427 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
2428 status
= usb_autoresume_device(udev
);
2430 /* Let the drivers do their thing, then... */
2431 usb_autosuspend_device(udev
);
2437 #else /* CONFIG_USB_SUSPEND */
2439 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2441 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
2446 /* However we may need to do a reset-resume */
2448 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
2450 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2451 int port1
= udev
->portnum
;
2453 u16 portchange
, portstatus
;
2455 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2456 status
= check_port_resume_type(udev
,
2457 hub
, port1
, status
, portchange
, portstatus
);
2460 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2461 hub_port_logical_disconnect(hub
, port1
);
2462 } else if (udev
->reset_resume
) {
2463 dev_dbg(&udev
->dev
, "reset-resume\n");
2464 status
= usb_reset_and_verify_device(udev
);
2471 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
2473 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2474 struct usb_device
*hdev
= hub
->hdev
;
2477 /* Warn if children aren't already suspended */
2478 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
2479 struct usb_device
*udev
;
2481 udev
= hdev
->children
[port1
-1];
2482 if (udev
&& udev
->can_submit
) {
2483 dev_warn(&intf
->dev
, "port %d nyet suspended\n", port1
);
2484 if (msg
.event
& PM_EVENT_AUTO
)
2489 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2491 /* stop khubd and related activity */
2492 hub_quiesce(hub
, HUB_SUSPEND
);
2496 static int hub_resume(struct usb_interface
*intf
)
2498 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2500 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2501 hub_activate(hub
, HUB_RESUME
);
2505 static int hub_reset_resume(struct usb_interface
*intf
)
2507 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2509 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2510 hub_activate(hub
, HUB_RESET_RESUME
);
2515 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2516 * @rhdev: struct usb_device for the root hub
2518 * The USB host controller driver calls this function when its root hub
2519 * is resumed and Vbus power has been interrupted or the controller
2520 * has been reset. The routine marks @rhdev as having lost power.
2521 * When the hub driver is resumed it will take notice and carry out
2522 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2523 * the others will be disconnected.
2525 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
2527 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
2528 rhdev
->reset_resume
= 1;
2530 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
2532 #else /* CONFIG_PM */
2534 #define hub_suspend NULL
2535 #define hub_resume NULL
2536 #define hub_reset_resume NULL
2540 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2542 * Between connect detection and reset signaling there must be a delay
2543 * of 100ms at least for debounce and power-settling. The corresponding
2544 * timer shall restart whenever the downstream port detects a disconnect.
2546 * Apparently there are some bluetooth and irda-dongles and a number of
2547 * low-speed devices for which this debounce period may last over a second.
2548 * Not covered by the spec - but easy to deal with.
2550 * This implementation uses a 1500ms total debounce timeout; if the
2551 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2552 * every 25ms for transient disconnects. When the port status has been
2553 * unchanged for 100ms it returns the port status.
2555 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2558 int total_time
, stable_time
= 0;
2559 u16 portchange
, portstatus
;
2560 unsigned connection
= 0xffff;
2562 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2563 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2567 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2568 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2569 stable_time
+= HUB_DEBOUNCE_STEP
;
2570 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2574 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2577 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2578 clear_port_feature(hub
->hdev
, port1
,
2579 USB_PORT_FEAT_C_CONNECTION
);
2582 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2584 msleep(HUB_DEBOUNCE_STEP
);
2587 dev_dbg (hub
->intfdev
,
2588 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2589 port1
, total_time
, stable_time
, portstatus
);
2591 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2596 void usb_ep0_reinit(struct usb_device
*udev
)
2598 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
, true);
2599 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
, true);
2600 usb_enable_endpoint(udev
, &udev
->ep0
, true);
2602 EXPORT_SYMBOL_GPL(usb_ep0_reinit
);
2604 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2605 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2607 static int hub_set_address(struct usb_device
*udev
, int devnum
)
2610 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2613 * The host controller will choose the device address,
2614 * instead of the core having chosen it earlier
2616 if (!hcd
->driver
->address_device
&& devnum
<= 1)
2618 if (udev
->state
== USB_STATE_ADDRESS
)
2620 if (udev
->state
!= USB_STATE_DEFAULT
)
2622 if (hcd
->driver
->address_device
) {
2623 retval
= hcd
->driver
->address_device(hcd
, udev
);
2625 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2626 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
2627 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2629 update_address(udev
, devnum
);
2632 /* Device now using proper address. */
2633 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2634 usb_ep0_reinit(udev
);
2639 /* Reset device, (re)assign address, get device descriptor.
2640 * Device connection must be stable, no more debouncing needed.
2641 * Returns device in USB_STATE_ADDRESS, except on error.
2643 * If this is called for an already-existing device (as part of
2644 * usb_reset_and_verify_device), the caller must own the device lock. For a
2645 * newly detected device that is not accessible through any global
2646 * pointers, it's not necessary to lock the device.
2649 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2652 static DEFINE_MUTEX(usb_address0_mutex
);
2654 struct usb_device
*hdev
= hub
->hdev
;
2655 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2657 unsigned delay
= HUB_SHORT_RESET_TIME
;
2658 enum usb_device_speed oldspeed
= udev
->speed
;
2660 int devnum
= udev
->devnum
;
2662 /* root hub ports have a slightly longer reset period
2663 * (from USB 2.0 spec, section 7.1.7.5)
2665 if (!hdev
->parent
) {
2666 delay
= HUB_ROOT_RESET_TIME
;
2667 if (port1
== hdev
->bus
->otg_port
)
2668 hdev
->bus
->b_hnp_enable
= 0;
2671 /* Some low speed devices have problems with the quick delay, so */
2672 /* be a bit pessimistic with those devices. RHbug #23670 */
2673 if (oldspeed
== USB_SPEED_LOW
)
2674 delay
= HUB_LONG_RESET_TIME
;
2676 mutex_lock(&usb_address0_mutex
);
2678 if (!udev
->config
&& oldspeed
== USB_SPEED_SUPER
) {
2679 /* Don't reset USB 3.0 devices during an initial setup */
2680 usb_set_device_state(udev
, USB_STATE_DEFAULT
);
2682 /* Reset the device; full speed may morph to high speed */
2683 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
2684 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2685 if (retval
< 0) /* error or disconnect */
2687 /* success, speed is known */
2691 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2692 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2695 oldspeed
= udev
->speed
;
2697 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2698 * it's fixed size except for full speed devices.
2699 * For Wireless USB devices, ep0 max packet is always 512 (tho
2700 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2702 switch (udev
->speed
) {
2703 case USB_SPEED_SUPER
:
2704 case USB_SPEED_WIRELESS
: /* fixed at 512 */
2705 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(512);
2707 case USB_SPEED_HIGH
: /* fixed at 64 */
2708 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
2710 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2711 /* to determine the ep0 maxpacket size, try to read
2712 * the device descriptor to get bMaxPacketSize0 and
2713 * then correct our initial guess.
2715 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
2717 case USB_SPEED_LOW
: /* fixed at 8 */
2718 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(8);
2725 switch (udev
->speed
) {
2726 case USB_SPEED_LOW
: speed
= "low"; break;
2727 case USB_SPEED_FULL
: speed
= "full"; break;
2728 case USB_SPEED_HIGH
: speed
= "high"; break;
2729 case USB_SPEED_SUPER
:
2732 case USB_SPEED_WIRELESS
:
2736 default: speed
= "?"; break;
2738 if (udev
->speed
!= USB_SPEED_SUPER
)
2739 dev_info(&udev
->dev
,
2740 "%s %s speed %sUSB device using %s and address %d\n",
2741 (udev
->config
) ? "reset" : "new", speed
, type
,
2742 udev
->bus
->controller
->driver
->name
, devnum
);
2744 /* Set up TT records, if needed */
2746 udev
->tt
= hdev
->tt
;
2747 udev
->ttport
= hdev
->ttport
;
2748 } else if (udev
->speed
!= USB_SPEED_HIGH
2749 && hdev
->speed
== USB_SPEED_HIGH
) {
2751 dev_err(&udev
->dev
, "parent hub has no TT\n");
2755 udev
->tt
= &hub
->tt
;
2756 udev
->ttport
= port1
;
2759 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2760 * Because device hardware and firmware is sometimes buggy in
2761 * this area, and this is how Linux has done it for ages.
2762 * Change it cautiously.
2764 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2765 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2766 * so it may help with some non-standards-compliant devices.
2767 * Otherwise we start with SET_ADDRESS and then try to read the
2768 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2771 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2773 * An xHCI controller cannot send any packets to a device until
2774 * a set address command successfully completes.
2776 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
)) {
2777 struct usb_device_descriptor
*buf
;
2780 #define GET_DESCRIPTOR_BUFSIZE 64
2781 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2787 /* Retry on all errors; some devices are flakey.
2788 * 255 is for WUSB devices, we actually need to use
2789 * 512 (WUSB1.0[4.8.1]).
2791 for (j
= 0; j
< 3; ++j
) {
2792 buf
->bMaxPacketSize0
= 0;
2793 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2794 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2795 USB_DT_DEVICE
<< 8, 0,
2796 buf
, GET_DESCRIPTOR_BUFSIZE
,
2797 initial_descriptor_timeout
);
2798 switch (buf
->bMaxPacketSize0
) {
2799 case 8: case 16: case 32: case 64: case 255:
2800 if (buf
->bDescriptorType
==
2814 udev
->descriptor
.bMaxPacketSize0
=
2815 buf
->bMaxPacketSize0
;
2818 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2819 if (retval
< 0) /* error or disconnect */
2821 if (oldspeed
!= udev
->speed
) {
2823 "device reset changed speed!\n");
2829 "device descriptor read/64, error %d\n",
2834 #undef GET_DESCRIPTOR_BUFSIZE
2838 * If device is WUSB, we already assigned an
2839 * unauthorized address in the Connect Ack sequence;
2840 * authorization will assign the final address.
2842 if (udev
->wusb
== 0) {
2843 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2844 retval
= hub_set_address(udev
, devnum
);
2851 "device not accepting address %d, error %d\n",
2855 if (udev
->speed
== USB_SPEED_SUPER
) {
2856 devnum
= udev
->devnum
;
2857 dev_info(&udev
->dev
,
2858 "%s SuperSpeed USB device using %s and address %d\n",
2859 (udev
->config
) ? "reset" : "new",
2860 udev
->bus
->controller
->driver
->name
, devnum
);
2863 /* cope with hardware quirkiness:
2864 * - let SET_ADDRESS settle, some device hardware wants it
2865 * - read ep0 maxpacket even for high and low speed,
2868 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
))
2872 retval
= usb_get_device_descriptor(udev
, 8);
2875 "device descriptor read/8, error %d\n",
2887 if (udev
->descriptor
.bMaxPacketSize0
== 0xff ||
2888 udev
->speed
== USB_SPEED_SUPER
)
2891 i
= udev
->descriptor
.bMaxPacketSize0
;
2892 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2893 if (udev
->speed
== USB_SPEED_LOW
||
2894 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2895 dev_err(&udev
->dev
, "Invalid ep0 maxpacket: %d\n", i
);
2899 if (udev
->speed
== USB_SPEED_FULL
)
2900 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2902 dev_warn(&udev
->dev
, "Using ep0 maxpacket: %d\n", i
);
2903 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2904 usb_ep0_reinit(udev
);
2907 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2908 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2909 dev_err(&udev
->dev
, "device descriptor read/all, error %d\n",
2920 hub_port_disable(hub
, port1
, 0);
2921 update_address(udev
, devnum
); /* for disconnect processing */
2923 mutex_unlock(&usb_address0_mutex
);
2928 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2930 struct usb_qualifier_descriptor
*qual
;
2933 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2937 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2938 qual
, sizeof *qual
);
2939 if (status
== sizeof *qual
) {
2940 dev_info(&udev
->dev
, "not running at top speed; "
2941 "connect to a high speed hub\n");
2942 /* hub LEDs are probably harder to miss than syslog */
2943 if (hub
->has_indicators
) {
2944 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2945 schedule_delayed_work (&hub
->leds
, 0);
2952 hub_power_remaining (struct usb_hub
*hub
)
2954 struct usb_device
*hdev
= hub
->hdev
;
2958 if (!hub
->limited_power
)
2961 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2962 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2963 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2969 /* Unconfigured devices may not use more than 100mA,
2970 * or 8mA for OTG ports */
2971 if (udev
->actconfig
)
2972 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2973 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2977 if (delta
> hub
->mA_per_port
)
2978 dev_warn(&udev
->dev
,
2979 "%dmA is over %umA budget for port %d!\n",
2980 delta
, hub
->mA_per_port
, port1
);
2983 if (remaining
< 0) {
2984 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2991 /* Handle physical or logical connection change events.
2992 * This routine is called when:
2993 * a port connection-change occurs;
2994 * a port enable-change occurs (often caused by EMI);
2995 * usb_reset_and_verify_device() encounters changed descriptors (as from
2996 * a firmware download)
2997 * caller already locked the hub
2999 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
3000 u16 portstatus
, u16 portchange
)
3002 struct usb_device
*hdev
= hub
->hdev
;
3003 struct device
*hub_dev
= hub
->intfdev
;
3004 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
3005 unsigned wHubCharacteristics
=
3006 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
3007 struct usb_device
*udev
;
3011 "port %d, status %04x, change %04x, %s\n",
3012 port1
, portstatus
, portchange
, portspeed (portstatus
));
3014 if (hub
->has_indicators
) {
3015 set_port_led(hub
, port1
, HUB_LED_AUTO
);
3016 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
3019 #ifdef CONFIG_USB_OTG
3020 /* during HNP, don't repeat the debounce */
3021 if (hdev
->bus
->is_b_host
)
3022 portchange
&= ~(USB_PORT_STAT_C_CONNECTION
|
3023 USB_PORT_STAT_C_ENABLE
);
3026 /* Try to resuscitate an existing device */
3027 udev
= hdev
->children
[port1
-1];
3028 if ((portstatus
& USB_PORT_STAT_CONNECTION
) && udev
&&
3029 udev
->state
!= USB_STATE_NOTATTACHED
) {
3030 usb_lock_device(udev
);
3031 if (portstatus
& USB_PORT_STAT_ENABLE
) {
3032 status
= 0; /* Nothing to do */
3034 #ifdef CONFIG_USB_SUSPEND
3035 } else if (udev
->state
== USB_STATE_SUSPENDED
&&
3036 udev
->persist_enabled
) {
3037 /* For a suspended device, treat this as a
3038 * remote wakeup event.
3040 status
= usb_remote_wakeup(udev
);
3044 status
= -ENODEV
; /* Don't resuscitate */
3046 usb_unlock_device(udev
);
3049 clear_bit(port1
, hub
->change_bits
);
3054 /* Disconnect any existing devices under this port */
3056 usb_disconnect(&hdev
->children
[port1
-1]);
3057 clear_bit(port1
, hub
->change_bits
);
3059 /* We can forget about a "removed" device when there's a physical
3060 * disconnect or the connect status changes.
3062 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
3063 (portchange
& USB_PORT_STAT_C_CONNECTION
))
3064 clear_bit(port1
, hub
->removed_bits
);
3066 if (portchange
& (USB_PORT_STAT_C_CONNECTION
|
3067 USB_PORT_STAT_C_ENABLE
)) {
3068 status
= hub_port_debounce(hub
, port1
);
3070 if (printk_ratelimit())
3071 dev_err(hub_dev
, "connect-debounce failed, "
3072 "port %d disabled\n", port1
);
3073 portstatus
&= ~USB_PORT_STAT_CONNECTION
;
3075 portstatus
= status
;
3079 /* Return now if debouncing failed or nothing is connected or
3080 * the device was "removed".
3082 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
3083 test_bit(port1
, hub
->removed_bits
)) {
3085 /* maybe switch power back on (e.g. root hub was reset) */
3086 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
3087 && !(portstatus
& USB_PORT_STAT_POWER
))
3088 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
3090 if (portstatus
& USB_PORT_STAT_ENABLE
)
3095 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
3097 /* reallocate for each attempt, since references
3098 * to the previous one can escape in various ways
3100 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
3103 "couldn't allocate port %d usb_device\n",
3108 usb_set_device_state(udev
, USB_STATE_POWERED
);
3109 udev
->bus_mA
= hub
->mA_per_port
;
3110 udev
->level
= hdev
->level
+ 1;
3111 udev
->wusb
= hub_is_wusb(hub
);
3114 * USB 3.0 devices are reset automatically before the connect
3115 * port status change appears, and the root hub port status
3116 * shows the correct speed. We also get port change
3117 * notifications for USB 3.0 devices from the USB 3.0 portion of
3118 * an external USB 3.0 hub, but this isn't handled correctly yet
3122 if (!(hcd
->driver
->flags
& HCD_USB3
))
3123 udev
->speed
= USB_SPEED_UNKNOWN
;
3124 else if ((hdev
->parent
== NULL
) &&
3125 (portstatus
& USB_PORT_STAT_SUPER_SPEED
))
3126 udev
->speed
= USB_SPEED_SUPER
;
3128 udev
->speed
= USB_SPEED_UNKNOWN
;
3131 * xHCI needs to issue an address device command later
3132 * in the hub_port_init sequence for SS/HS/FS/LS devices.
3134 if (!(hcd
->driver
->flags
& HCD_USB3
)) {
3135 /* set the address */
3136 choose_address(udev
);
3137 if (udev
->devnum
<= 0) {
3138 status
= -ENOTCONN
; /* Don't retry */
3143 /* reset (non-USB 3.0 devices) and get descriptor */
3144 status
= hub_port_init(hub
, udev
, port1
, i
);
3148 usb_detect_quirks(udev
);
3149 if (udev
->quirks
& USB_QUIRK_DELAY_INIT
)
3152 /* consecutive bus-powered hubs aren't reliable; they can
3153 * violate the voltage drop budget. if the new child has
3154 * a "powered" LED, users should notice we didn't enable it
3155 * (without reading syslog), even without per-port LEDs
3158 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
3159 && udev
->bus_mA
<= 100) {
3162 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
3165 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
3168 le16_to_cpus(&devstat
);
3169 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
3171 "can't connect bus-powered hub "
3173 if (hub
->has_indicators
) {
3174 hub
->indicator
[port1
-1] =
3175 INDICATOR_AMBER_BLINK
;
3176 schedule_delayed_work (&hub
->leds
, 0);
3178 status
= -ENOTCONN
; /* Don't retry */
3183 /* check for devices running slower than they could */
3184 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
3185 && udev
->speed
== USB_SPEED_FULL
3186 && highspeed_hubs
!= 0)
3187 check_highspeed (hub
, udev
, port1
);
3189 /* Store the parent's children[] pointer. At this point
3190 * udev becomes globally accessible, although presumably
3191 * no one will look at it until hdev is unlocked.
3195 /* We mustn't add new devices if the parent hub has
3196 * been disconnected; we would race with the
3197 * recursively_mark_NOTATTACHED() routine.
3199 spin_lock_irq(&device_state_lock
);
3200 if (hdev
->state
== USB_STATE_NOTATTACHED
)
3203 hdev
->children
[port1
-1] = udev
;
3204 spin_unlock_irq(&device_state_lock
);
3206 /* Run it through the hoops (find a driver, etc) */
3208 status
= usb_new_device(udev
);
3210 spin_lock_irq(&device_state_lock
);
3211 hdev
->children
[port1
-1] = NULL
;
3212 spin_unlock_irq(&device_state_lock
);
3219 status
= hub_power_remaining(hub
);
3221 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
3226 hub_port_disable(hub
, port1
, 1);
3228 usb_ep0_reinit(udev
);
3229 release_address(udev
);
3232 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
3235 if (hub
->hdev
->parent
||
3236 !hcd
->driver
->port_handed_over
||
3237 !(hcd
->driver
->port_handed_over
)(hcd
, port1
))
3238 dev_err(hub_dev
, "unable to enumerate USB device on port %d\n",
3242 hub_port_disable(hub
, port1
, 1);
3243 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
3244 hcd
->driver
->relinquish_port(hcd
, port1
);
3247 static void hub_events(void)
3249 struct list_head
*tmp
;
3250 struct usb_device
*hdev
;
3251 struct usb_interface
*intf
;
3252 struct usb_hub
*hub
;
3253 struct device
*hub_dev
;
3262 * We restart the list every time to avoid a deadlock with
3263 * deleting hubs downstream from this one. This should be
3264 * safe since we delete the hub from the event list.
3265 * Not the most efficient, but avoids deadlocks.
3269 /* Grab the first entry at the beginning of the list */
3270 spin_lock_irq(&hub_event_lock
);
3271 if (list_empty(&hub_event_list
)) {
3272 spin_unlock_irq(&hub_event_lock
);
3276 tmp
= hub_event_list
.next
;
3279 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
3280 kref_get(&hub
->kref
);
3281 spin_unlock_irq(&hub_event_lock
);
3284 hub_dev
= hub
->intfdev
;
3285 intf
= to_usb_interface(hub_dev
);
3286 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
3287 hdev
->state
, hub
->descriptor
3288 ? hub
->descriptor
->bNbrPorts
3290 /* NOTE: expects max 15 ports... */
3291 (u16
) hub
->change_bits
[0],
3292 (u16
) hub
->event_bits
[0]);
3294 /* Lock the device, then check to see if we were
3295 * disconnected while waiting for the lock to succeed. */
3296 usb_lock_device(hdev
);
3297 if (unlikely(hub
->disconnected
))
3298 goto loop_disconnected
;
3300 /* If the hub has died, clean up after it */
3301 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
3302 hub
->error
= -ENODEV
;
3303 hub_quiesce(hub
, HUB_DISCONNECT
);
3308 ret
= usb_autopm_get_interface(intf
);
3310 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
3314 /* If this is an inactive hub, do nothing */
3319 dev_dbg (hub_dev
, "resetting for error %d\n",
3322 ret
= usb_reset_device(hdev
);
3325 "error resetting hub: %d\n", ret
);
3333 /* deal with port status changes */
3334 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
3335 if (test_bit(i
, hub
->busy_bits
))
3337 connect_change
= test_bit(i
, hub
->change_bits
);
3338 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
3342 ret
= hub_port_status(hub
, i
,
3343 &portstatus
, &portchange
);
3347 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
3348 clear_port_feature(hdev
, i
,
3349 USB_PORT_FEAT_C_CONNECTION
);
3353 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
3354 if (!connect_change
)
3356 "port %d enable change, "
3359 clear_port_feature(hdev
, i
,
3360 USB_PORT_FEAT_C_ENABLE
);
3363 * EM interference sometimes causes badly
3364 * shielded USB devices to be shutdown by
3365 * the hub, this hack enables them again.
3366 * Works at least with mouse driver.
3368 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
3370 && hdev
->children
[i
-1]) {
3373 "disabled by hub (EMI?), "
3380 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
3381 struct usb_device
*udev
;
3383 clear_port_feature(hdev
, i
,
3384 USB_PORT_FEAT_C_SUSPEND
);
3385 udev
= hdev
->children
[i
-1];
3387 /* TRSMRCY = 10 msec */
3390 usb_lock_device(udev
);
3391 ret
= usb_remote_wakeup(hdev
->
3393 usb_unlock_device(udev
);
3398 hub_port_disable(hub
, i
, 1);
3401 "resume on port %d, status %d\n",
3405 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
3407 "over-current change on port %d\n",
3409 clear_port_feature(hdev
, i
,
3410 USB_PORT_FEAT_C_OVER_CURRENT
);
3411 hub_power_on(hub
, true);
3414 if (portchange
& USB_PORT_STAT_C_RESET
) {
3416 "reset change on port %d\n",
3418 clear_port_feature(hdev
, i
,
3419 USB_PORT_FEAT_C_RESET
);
3423 hub_port_connect_change(hub
, i
,
3424 portstatus
, portchange
);
3427 /* deal with hub status changes */
3428 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
3430 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
3431 dev_err (hub_dev
, "get_hub_status failed\n");
3433 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
3434 dev_dbg (hub_dev
, "power change\n");
3435 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
3436 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
3437 /* FIXME: Is this always true? */
3438 hub
->limited_power
= 1;
3440 hub
->limited_power
= 0;
3442 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
3443 dev_dbg (hub_dev
, "overcurrent change\n");
3444 msleep(500); /* Cool down */
3445 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
3446 hub_power_on(hub
, true);
3451 /* Balance the usb_autopm_get_interface() above */
3452 usb_autopm_put_interface_no_suspend(intf
);
3454 /* Balance the usb_autopm_get_interface_no_resume() in
3455 * kick_khubd() and allow autosuspend.
3457 usb_autopm_put_interface(intf
);
3459 usb_unlock_device(hdev
);
3460 kref_put(&hub
->kref
, hub_release
);
3462 } /* end while (1) */
3465 static int hub_thread(void *__unused
)
3467 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3468 * port handover. Otherwise it might see that a full-speed device
3469 * was gone before the EHCI controller had handed its port over to
3470 * the companion full-speed controller.
3476 wait_event_freezable(khubd_wait
,
3477 !list_empty(&hub_event_list
) ||
3478 kthread_should_stop());
3479 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
3481 pr_debug("%s: khubd exiting\n", usbcore_name
);
3485 static const struct usb_device_id hub_id_table
[] = {
3486 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
3487 .bDeviceClass
= USB_CLASS_HUB
},
3488 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
3489 .bInterfaceClass
= USB_CLASS_HUB
},
3490 { } /* Terminating entry */
3493 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
3495 static struct usb_driver hub_driver
= {
3498 .disconnect
= hub_disconnect
,
3499 .suspend
= hub_suspend
,
3500 .resume
= hub_resume
,
3501 .reset_resume
= hub_reset_resume
,
3502 .pre_reset
= hub_pre_reset
,
3503 .post_reset
= hub_post_reset
,
3505 .id_table
= hub_id_table
,
3506 .supports_autosuspend
= 1,
3509 int usb_hub_init(void)
3511 if (usb_register(&hub_driver
) < 0) {
3512 printk(KERN_ERR
"%s: can't register hub driver\n",
3517 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
3518 if (!IS_ERR(khubd_task
))
3521 /* Fall through if kernel_thread failed */
3522 usb_deregister(&hub_driver
);
3523 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
3528 void usb_hub_cleanup(void)
3530 kthread_stop(khubd_task
);
3533 * Hub resources are freed for us by usb_deregister. It calls
3534 * usb_driver_purge on every device which in turn calls that
3535 * devices disconnect function if it is using this driver.
3536 * The hub_disconnect function takes care of releasing the
3537 * individual hub resources. -greg
3539 usb_deregister(&hub_driver
);
3540 } /* usb_hub_cleanup() */
3542 static int descriptors_changed(struct usb_device
*udev
,
3543 struct usb_device_descriptor
*old_device_descriptor
)
3547 unsigned serial_len
= 0;
3549 unsigned old_length
;
3553 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
3554 sizeof(*old_device_descriptor
)) != 0)
3557 /* Since the idVendor, idProduct, and bcdDevice values in the
3558 * device descriptor haven't changed, we will assume the
3559 * Manufacturer and Product strings haven't changed either.
3560 * But the SerialNumber string could be different (e.g., a
3561 * different flash card of the same brand).
3564 serial_len
= strlen(udev
->serial
) + 1;
3567 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3568 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3569 len
= max(len
, old_length
);
3572 buf
= kmalloc(len
, GFP_NOIO
);
3574 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
3575 /* assume the worst */
3578 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3579 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3580 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
3582 if (length
!= old_length
) {
3583 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
3588 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
3590 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
3592 ((struct usb_config_descriptor
*) buf
)->
3593 bConfigurationValue
);
3599 if (!changed
&& serial_len
) {
3600 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
3602 if (length
+ 1 != serial_len
) {
3603 dev_dbg(&udev
->dev
, "serial string error %d\n",
3606 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
3607 dev_dbg(&udev
->dev
, "serial string changed\n");
3617 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
3618 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3620 * WARNING - don't use this routine to reset a composite device
3621 * (one with multiple interfaces owned by separate drivers)!
3622 * Use usb_reset_device() instead.
3624 * Do a port reset, reassign the device's address, and establish its
3625 * former operating configuration. If the reset fails, or the device's
3626 * descriptors change from their values before the reset, or the original
3627 * configuration and altsettings cannot be restored, a flag will be set
3628 * telling khubd to pretend the device has been disconnected and then
3629 * re-connected. All drivers will be unbound, and the device will be
3630 * re-enumerated and probed all over again.
3632 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3633 * flagged for logical disconnection, or some other negative error code
3634 * if the reset wasn't even attempted.
3636 * The caller must own the device lock. For example, it's safe to use
3637 * this from a driver probe() routine after downloading new firmware.
3638 * For calls that might not occur during probe(), drivers should lock
3639 * the device using usb_lock_device_for_reset().
3641 * Locking exception: This routine may also be called from within an
3642 * autoresume handler. Such usage won't conflict with other tasks
3643 * holding the device lock because these tasks should always call
3644 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3646 static int usb_reset_and_verify_device(struct usb_device
*udev
)
3648 struct usb_device
*parent_hdev
= udev
->parent
;
3649 struct usb_hub
*parent_hub
;
3650 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3651 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3653 int port1
= udev
->portnum
;
3655 if (udev
->state
== USB_STATE_NOTATTACHED
||
3656 udev
->state
== USB_STATE_SUSPENDED
) {
3657 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3663 /* this requires hcd-specific logic; see OHCI hc_restart() */
3664 dev_dbg(&udev
->dev
, "%s for root hub!\n", __func__
);
3667 parent_hub
= hdev_to_hub(parent_hdev
);
3669 set_bit(port1
, parent_hub
->busy_bits
);
3670 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3672 /* ep0 maxpacket size may change; let the HCD know about it.
3673 * Other endpoints will be handled by re-enumeration. */
3674 usb_ep0_reinit(udev
);
3675 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3676 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
3679 clear_bit(port1
, parent_hub
->busy_bits
);
3684 /* Device might have changed firmware (DFU or similar) */
3685 if (descriptors_changed(udev
, &descriptor
)) {
3686 dev_info(&udev
->dev
, "device firmware changed\n");
3687 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3691 /* Restore the device's previous configuration */
3692 if (!udev
->actconfig
)
3695 mutex_lock(&hcd
->bandwidth_mutex
);
3696 ret
= usb_hcd_alloc_bandwidth(udev
, udev
->actconfig
, NULL
, NULL
);
3698 dev_warn(&udev
->dev
,
3699 "Busted HC? Not enough HCD resources for "
3700 "old configuration.\n");
3701 mutex_unlock(&hcd
->bandwidth_mutex
);
3704 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3705 USB_REQ_SET_CONFIGURATION
, 0,
3706 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3707 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3710 "can't restore configuration #%d (error=%d)\n",
3711 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3712 mutex_unlock(&hcd
->bandwidth_mutex
);
3715 mutex_unlock(&hcd
->bandwidth_mutex
);
3716 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3718 /* Put interfaces back into the same altsettings as before.
3719 * Don't bother to send the Set-Interface request for interfaces
3720 * that were already in altsetting 0; besides being unnecessary,
3721 * many devices can't handle it. Instead just reset the host-side
3724 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3725 struct usb_host_config
*config
= udev
->actconfig
;
3726 struct usb_interface
*intf
= config
->interface
[i
];
3727 struct usb_interface_descriptor
*desc
;
3729 desc
= &intf
->cur_altsetting
->desc
;
3730 if (desc
->bAlternateSetting
== 0) {
3731 usb_disable_interface(udev
, intf
, true);
3732 usb_enable_interface(udev
, intf
, true);
3735 /* Let the bandwidth allocation function know that this
3736 * device has been reset, and it will have to use
3737 * alternate setting 0 as the current alternate setting.
3739 intf
->resetting_device
= 1;
3740 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3741 desc
->bAlternateSetting
);
3742 intf
->resetting_device
= 0;
3745 dev_err(&udev
->dev
, "failed to restore interface %d "
3746 "altsetting %d (error=%d)\n",
3747 desc
->bInterfaceNumber
,
3748 desc
->bAlternateSetting
,
3758 hub_port_logical_disconnect(parent_hub
, port1
);
3763 * usb_reset_device - warn interface drivers and perform a USB port reset
3764 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3766 * Warns all drivers bound to registered interfaces (using their pre_reset
3767 * method), performs the port reset, and then lets the drivers know that
3768 * the reset is over (using their post_reset method).
3770 * Return value is the same as for usb_reset_and_verify_device().
3772 * The caller must own the device lock. For example, it's safe to use
3773 * this from a driver probe() routine after downloading new firmware.
3774 * For calls that might not occur during probe(), drivers should lock
3775 * the device using usb_lock_device_for_reset().
3777 * If an interface is currently being probed or disconnected, we assume
3778 * its driver knows how to handle resets. For all other interfaces,
3779 * if the driver doesn't have pre_reset and post_reset methods then
3780 * we attempt to unbind it and rebind afterward.
3782 int usb_reset_device(struct usb_device
*udev
)
3786 struct usb_host_config
*config
= udev
->actconfig
;
3788 if (udev
->state
== USB_STATE_NOTATTACHED
||
3789 udev
->state
== USB_STATE_SUSPENDED
) {
3790 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3795 /* Prevent autosuspend during the reset */
3796 usb_autoresume_device(udev
);
3799 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3800 struct usb_interface
*cintf
= config
->interface
[i
];
3801 struct usb_driver
*drv
;
3804 if (cintf
->dev
.driver
) {
3805 drv
= to_usb_driver(cintf
->dev
.driver
);
3806 if (drv
->pre_reset
&& drv
->post_reset
)
3807 unbind
= (drv
->pre_reset
)(cintf
);
3808 else if (cintf
->condition
==
3809 USB_INTERFACE_BOUND
)
3812 usb_forced_unbind_intf(cintf
);
3817 ret
= usb_reset_and_verify_device(udev
);
3820 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3821 struct usb_interface
*cintf
= config
->interface
[i
];
3822 struct usb_driver
*drv
;
3823 int rebind
= cintf
->needs_binding
;
3825 if (!rebind
&& cintf
->dev
.driver
) {
3826 drv
= to_usb_driver(cintf
->dev
.driver
);
3827 if (drv
->post_reset
)
3828 rebind
= (drv
->post_reset
)(cintf
);
3829 else if (cintf
->condition
==
3830 USB_INTERFACE_BOUND
)
3833 if (ret
== 0 && rebind
)
3834 usb_rebind_intf(cintf
);
3838 usb_autosuspend_device(udev
);
3841 EXPORT_SYMBOL_GPL(usb_reset_device
);
3845 * usb_queue_reset_device - Reset a USB device from an atomic context
3846 * @iface: USB interface belonging to the device to reset
3848 * This function can be used to reset a USB device from an atomic
3849 * context, where usb_reset_device() won't work (as it blocks).
3851 * Doing a reset via this method is functionally equivalent to calling
3852 * usb_reset_device(), except for the fact that it is delayed to a
3853 * workqueue. This means that any drivers bound to other interfaces
3854 * might be unbound, as well as users from usbfs in user space.
3858 * - Scheduling two resets at the same time from two different drivers
3859 * attached to two different interfaces of the same device is
3860 * possible; depending on how the driver attached to each interface
3861 * handles ->pre_reset(), the second reset might happen or not.
3863 * - If a driver is unbound and it had a pending reset, the reset will
3866 * - This function can be called during .probe() or .disconnect()
3867 * times. On return from .disconnect(), any pending resets will be
3870 * There is no no need to lock/unlock the @reset_ws as schedule_work()
3873 * NOTE: We don't do any reference count tracking because it is not
3874 * needed. The lifecycle of the work_struct is tied to the
3875 * usb_interface. Before destroying the interface we cancel the
3876 * work_struct, so the fact that work_struct is queued and or
3877 * running means the interface (and thus, the device) exist and
3880 void usb_queue_reset_device(struct usb_interface
*iface
)
3882 schedule_work(&iface
->reset_ws
);
3884 EXPORT_SYMBOL_GPL(usb_queue_reset_device
);