4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/kthread.h>
23 #include <linux/mutex.h>
24 #include <linux/freezer.h>
26 #include <asm/uaccess.h>
27 #include <asm/byteorder.h>
33 /* if we are in debug mode, always announce new devices */
35 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
36 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
41 struct device
*intfdev
; /* the "interface" device */
42 struct usb_device
*hdev
;
44 struct urb
*urb
; /* for interrupt polling pipe */
46 /* buffer for urb ... with extra space in case of babble */
49 struct usb_hub_status hub
;
50 struct usb_port_status port
;
51 } *status
; /* buffer for status reports */
52 struct mutex status_mutex
; /* for the status buffer */
54 int error
; /* last reported error */
55 int nerrors
; /* track consecutive errors */
57 struct list_head event_list
; /* hubs w/data or errs ready */
58 unsigned long event_bits
[1]; /* status change bitmask */
59 unsigned long change_bits
[1]; /* ports with logical connect
61 unsigned long busy_bits
[1]; /* ports being reset or
63 unsigned long removed_bits
[1]; /* ports with a "removed"
65 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
66 #error event_bits[] is too short!
69 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
70 struct usb_tt tt
; /* Transaction Translator */
72 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
& (1 << USB_PORT_FEAT_HIGHSPEED
))
159 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
161 else if (portstatus
& (1 << USB_PORT_FEAT_SUPERSPEED
))
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
&& status
== -ETIMEDOUT
; i
++) {
331 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
332 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
333 data
, sizeof(*data
), USB_STS_TIMEOUT
);
339 * USB 2.0 spec Section 11.24.2.7
341 static int get_port_status(struct usb_device
*hdev
, int port1
,
342 struct usb_port_status
*data
)
344 int i
, status
= -ETIMEDOUT
;
346 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
347 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
348 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
349 data
, sizeof(*data
), USB_STS_TIMEOUT
);
354 static int hub_port_status(struct usb_hub
*hub
, int port1
,
355 u16
*status
, u16
*change
)
359 mutex_lock(&hub
->status_mutex
);
360 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
362 dev_err(hub
->intfdev
,
363 "%s failed (err = %d)\n", __func__
, ret
);
367 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
368 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
371 mutex_unlock(&hub
->status_mutex
);
375 static void kick_khubd(struct usb_hub
*hub
)
379 spin_lock_irqsave(&hub_event_lock
, flags
);
380 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
381 list_add_tail(&hub
->event_list
, &hub_event_list
);
383 /* Suppress autosuspend until khubd runs */
384 usb_autopm_get_interface_no_resume(
385 to_usb_interface(hub
->intfdev
));
386 wake_up(&khubd_wait
);
388 spin_unlock_irqrestore(&hub_event_lock
, flags
);
391 void usb_kick_khubd(struct usb_device
*hdev
)
393 struct usb_hub
*hub
= hdev_to_hub(hdev
);
400 /* completion function, fires on port status changes and various faults */
401 static void hub_irq(struct urb
*urb
)
403 struct usb_hub
*hub
= urb
->context
;
404 int status
= urb
->status
;
409 case -ENOENT
: /* synchronous unlink */
410 case -ECONNRESET
: /* async unlink */
411 case -ESHUTDOWN
: /* hardware going away */
414 default: /* presumably an error */
415 /* Cause a hub reset after 10 consecutive errors */
416 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
417 if ((++hub
->nerrors
< 10) || hub
->error
)
422 /* let khubd handle things */
423 case 0: /* we got data: port status changed */
425 for (i
= 0; i
< urb
->actual_length
; ++i
)
426 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
428 hub
->event_bits
[0] = bits
;
434 /* Something happened, let khubd figure it out */
441 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
442 && status
!= -ENODEV
&& status
!= -EPERM
)
443 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
446 /* USB 2.0 spec Section 11.24.2.3 */
448 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
450 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
451 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
456 * enumeration blocks khubd for a long time. we use keventd instead, since
457 * long blocking there is the exception, not the rule. accordingly, HCDs
458 * talking to TTs must queue control transfers (not just bulk and iso), so
459 * both can talk to the same hub concurrently.
461 static void hub_tt_work(struct work_struct
*work
)
463 struct usb_hub
*hub
=
464 container_of(work
, struct usb_hub
, tt
.clear_work
);
468 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
469 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
470 struct list_head
*next
;
471 struct usb_tt_clear
*clear
;
472 struct usb_device
*hdev
= hub
->hdev
;
473 const struct hc_driver
*drv
;
476 next
= hub
->tt
.clear_list
.next
;
477 clear
= list_entry (next
, struct usb_tt_clear
, clear_list
);
478 list_del (&clear
->clear_list
);
480 /* drop lock so HCD can concurrently report other TT errors */
481 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
482 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
485 "clear tt %d (%04x) error %d\n",
486 clear
->tt
, clear
->devinfo
, status
);
488 /* Tell the HCD, even if the operation failed */
489 drv
= clear
->hcd
->driver
;
490 if (drv
->clear_tt_buffer_complete
)
491 (drv
->clear_tt_buffer_complete
)(clear
->hcd
, clear
->ep
);
494 spin_lock_irqsave(&hub
->tt
.lock
, flags
);
496 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
500 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
501 * @urb: an URB associated with the failed or incomplete split transaction
503 * High speed HCDs use this to tell the hub driver that some split control or
504 * bulk transaction failed in a way that requires clearing internal state of
505 * a transaction translator. This is normally detected (and reported) from
508 * It may not be possible for that hub to handle additional full (or low)
509 * speed transactions until that state is fully cleared out.
511 int usb_hub_clear_tt_buffer(struct urb
*urb
)
513 struct usb_device
*udev
= urb
->dev
;
514 int pipe
= urb
->pipe
;
515 struct usb_tt
*tt
= udev
->tt
;
517 struct usb_tt_clear
*clear
;
519 /* we've got to cope with an arbitrary number of pending TT clears,
520 * since each TT has "at least two" buffers that can need it (and
521 * there can be many TTs per hub). even if they're uncommon.
523 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
524 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
525 /* FIXME recover somehow ... RESET_TT? */
529 /* info that CLEAR_TT_BUFFER needs */
530 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
531 clear
->devinfo
= usb_pipeendpoint (pipe
);
532 clear
->devinfo
|= udev
->devnum
<< 4;
533 clear
->devinfo
|= usb_pipecontrol (pipe
)
534 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
535 : (USB_ENDPOINT_XFER_BULK
<< 11);
536 if (usb_pipein (pipe
))
537 clear
->devinfo
|= 1 << 15;
539 /* info for completion callback */
540 clear
->hcd
= bus_to_hcd(udev
->bus
);
543 /* tell keventd to clear state for this TT */
544 spin_lock_irqsave (&tt
->lock
, flags
);
545 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
546 schedule_work(&tt
->clear_work
);
547 spin_unlock_irqrestore (&tt
->lock
, flags
);
550 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer
);
552 /* If do_delay is false, return the number of milliseconds the caller
555 static unsigned hub_power_on(struct usb_hub
*hub
, bool do_delay
)
558 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
560 u16 wHubCharacteristics
=
561 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
563 /* Enable power on each port. Some hubs have reserved values
564 * of LPSM (> 2) in their descriptors, even though they are
565 * USB 2.0 hubs. Some hubs do not implement port-power switching
566 * but only emulate it. In all cases, the ports won't work
567 * unless we send these messages to the hub.
569 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
570 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
572 dev_dbg(hub
->intfdev
, "trying to enable port power on "
573 "non-switchable hub\n");
574 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
575 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
577 /* Wait at least 100 msec for power to become stable */
578 delay
= max(pgood_delay
, (unsigned) 100);
584 static int hub_hub_status(struct usb_hub
*hub
,
585 u16
*status
, u16
*change
)
589 mutex_lock(&hub
->status_mutex
);
590 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
592 dev_err (hub
->intfdev
,
593 "%s failed (err = %d)\n", __func__
, ret
);
595 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
596 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
599 mutex_unlock(&hub
->status_mutex
);
603 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
605 struct usb_device
*hdev
= hub
->hdev
;
608 if (hdev
->children
[port1
-1] && set_state
)
609 usb_set_device_state(hdev
->children
[port1
-1],
610 USB_STATE_NOTATTACHED
);
612 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
614 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
620 * Disable a port and mark a logical connnect-change event, so that some
621 * time later khubd will disconnect() any existing usb_device on the port
622 * and will re-enumerate if there actually is a device attached.
624 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
626 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
627 hub_port_disable(hub
, port1
, 1);
629 /* FIXME let caller ask to power down the port:
630 * - some devices won't enumerate without a VBUS power cycle
631 * - SRP saves power that way
632 * - ... new call, TBD ...
633 * That's easy if this hub can switch power per-port, and
634 * khubd reactivates the port later (timer, SRP, etc).
635 * Powerdown must be optional, because of reset/DFU.
638 set_bit(port1
, hub
->change_bits
);
643 * usb_remove_device - disable a device's port on its parent hub
644 * @udev: device to be disabled and removed
645 * Context: @udev locked, must be able to sleep.
647 * After @udev's port has been disabled, khubd is notified and it will
648 * see that the device has been disconnected. When the device is
649 * physically unplugged and something is plugged in, the events will
650 * be received and processed normally.
652 int usb_remove_device(struct usb_device
*udev
)
655 struct usb_interface
*intf
;
657 if (!udev
->parent
) /* Can't remove a root hub */
659 hub
= hdev_to_hub(udev
->parent
);
660 intf
= to_usb_interface(hub
->intfdev
);
662 usb_autopm_get_interface(intf
);
663 set_bit(udev
->portnum
, hub
->removed_bits
);
664 hub_port_logical_disconnect(hub
, udev
->portnum
);
665 usb_autopm_put_interface(intf
);
669 enum hub_activation_type
{
670 HUB_INIT
, HUB_INIT2
, HUB_INIT3
, /* INITs must come first */
671 HUB_POST_RESET
, HUB_RESUME
, HUB_RESET_RESUME
,
674 static void hub_init_func2(struct work_struct
*ws
);
675 static void hub_init_func3(struct work_struct
*ws
);
677 static void hub_activate(struct usb_hub
*hub
, enum hub_activation_type type
)
679 struct usb_device
*hdev
= hub
->hdev
;
682 bool need_debounce_delay
= false;
685 /* Continue a partial initialization */
686 if (type
== HUB_INIT2
)
688 if (type
== HUB_INIT3
)
691 /* After a resume, port power should still be on.
692 * For any other type of activation, turn it on.
694 if (type
!= HUB_RESUME
) {
696 /* Speed up system boot by using a delayed_work for the
697 * hub's initial power-up delays. This is pretty awkward
698 * and the implementation looks like a home-brewed sort of
699 * setjmp/longjmp, but it saves at least 100 ms for each
700 * root hub (assuming usbcore is compiled into the kernel
701 * rather than as a module). It adds up.
703 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
704 * because for those activation types the ports have to be
705 * operational when we return. In theory this could be done
706 * for HUB_POST_RESET, but it's easier not to.
708 if (type
== HUB_INIT
) {
709 delay
= hub_power_on(hub
, false);
710 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func2
);
711 schedule_delayed_work(&hub
->init_work
,
712 msecs_to_jiffies(delay
));
714 /* Suppress autosuspend until init is done */
715 usb_autopm_get_interface_no_resume(
716 to_usb_interface(hub
->intfdev
));
717 return; /* Continues at init2: below */
719 hub_power_on(hub
, true);
724 /* Check each port and set hub->change_bits to let khubd know
725 * which ports need attention.
727 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
728 struct usb_device
*udev
= hdev
->children
[port1
-1];
729 u16 portstatus
, portchange
;
731 portstatus
= portchange
= 0;
732 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
733 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
734 dev_dbg(hub
->intfdev
,
735 "port %d: status %04x change %04x\n",
736 port1
, portstatus
, portchange
);
738 /* After anything other than HUB_RESUME (i.e., initialization
739 * or any sort of reset), every port should be disabled.
740 * Unconnected ports should likewise be disabled (paranoia),
741 * and so should ports for which we have no usb_device.
743 if ((portstatus
& USB_PORT_STAT_ENABLE
) && (
744 type
!= HUB_RESUME
||
745 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
747 udev
->state
== USB_STATE_NOTATTACHED
)) {
748 clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
749 portstatus
&= ~USB_PORT_STAT_ENABLE
;
752 /* Clear status-change flags; we'll debounce later */
753 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
754 need_debounce_delay
= true;
755 clear_port_feature(hub
->hdev
, port1
,
756 USB_PORT_FEAT_C_CONNECTION
);
758 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
759 need_debounce_delay
= true;
760 clear_port_feature(hub
->hdev
, port1
,
761 USB_PORT_FEAT_C_ENABLE
);
764 /* We can forget about a "removed" device when there's a
765 * physical disconnect or the connect status changes.
767 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
768 (portchange
& USB_PORT_STAT_C_CONNECTION
))
769 clear_bit(port1
, hub
->removed_bits
);
771 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
772 /* Tell khubd to disconnect the device or
773 * check for a new connection
775 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
776 set_bit(port1
, hub
->change_bits
);
778 } else if (portstatus
& USB_PORT_STAT_ENABLE
) {
779 /* The power session apparently survived the resume.
780 * If there was an overcurrent or suspend change
781 * (i.e., remote wakeup request), have khubd
785 set_bit(port1
, hub
->change_bits
);
787 } else if (udev
->persist_enabled
) {
789 udev
->reset_resume
= 1;
791 set_bit(port1
, hub
->change_bits
);
794 /* The power session is gone; tell khubd */
795 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
796 set_bit(port1
, hub
->change_bits
);
800 /* If no port-status-change flags were set, we don't need any
801 * debouncing. If flags were set we can try to debounce the
802 * ports all at once right now, instead of letting khubd do them
803 * one at a time later on.
805 * If any port-status changes do occur during this delay, khubd
806 * will see them later and handle them normally.
808 if (need_debounce_delay
) {
809 delay
= HUB_DEBOUNCE_STABLE
;
811 /* Don't do a long sleep inside a workqueue routine */
812 if (type
== HUB_INIT2
) {
813 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func3
);
814 schedule_delayed_work(&hub
->init_work
,
815 msecs_to_jiffies(delay
));
816 return; /* Continues at init3: below */
825 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
827 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
828 if (hub
->has_indicators
&& blinkenlights
)
829 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
831 /* Scan all ports that need attention */
834 /* Allow autosuspend if it was suppressed */
835 if (type
<= HUB_INIT3
)
836 usb_autopm_put_interface_async(to_usb_interface(hub
->intfdev
));
839 /* Implement the continuations for the delays above */
840 static void hub_init_func2(struct work_struct
*ws
)
842 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
844 hub_activate(hub
, HUB_INIT2
);
847 static void hub_init_func3(struct work_struct
*ws
)
849 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
851 hub_activate(hub
, HUB_INIT3
);
854 enum hub_quiescing_type
{
855 HUB_DISCONNECT
, HUB_PRE_RESET
, HUB_SUSPEND
858 static void hub_quiesce(struct usb_hub
*hub
, enum hub_quiescing_type type
)
860 struct usb_device
*hdev
= hub
->hdev
;
863 cancel_delayed_work_sync(&hub
->init_work
);
864 if (!hub
->init_done
) {
866 usb_autopm_put_interface_no_suspend(
867 to_usb_interface(hub
->intfdev
));
870 /* khubd and related activity won't re-trigger */
873 if (type
!= HUB_SUSPEND
) {
874 /* Disconnect all the children */
875 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
876 if (hdev
->children
[i
])
877 usb_disconnect(&hdev
->children
[i
]);
881 /* Stop khubd and related activity */
882 usb_kill_urb(hub
->urb
);
883 if (hub
->has_indicators
)
884 cancel_delayed_work_sync(&hub
->leds
);
886 cancel_work_sync(&hub
->tt
.clear_work
);
889 /* caller has locked the hub device */
890 static int hub_pre_reset(struct usb_interface
*intf
)
892 struct usb_hub
*hub
= usb_get_intfdata(intf
);
894 hub_quiesce(hub
, HUB_PRE_RESET
);
898 /* caller has locked the hub device */
899 static int hub_post_reset(struct usb_interface
*intf
)
901 struct usb_hub
*hub
= usb_get_intfdata(intf
);
903 hub_activate(hub
, HUB_POST_RESET
);
907 static int hub_configure(struct usb_hub
*hub
,
908 struct usb_endpoint_descriptor
*endpoint
)
911 struct usb_device
*hdev
= hub
->hdev
;
912 struct device
*hub_dev
= hub
->intfdev
;
913 u16 hubstatus
, hubchange
;
914 u16 wHubCharacteristics
;
917 char *message
= "out of memory";
919 hub
->buffer
= kmalloc(sizeof(*hub
->buffer
), GFP_KERNEL
);
925 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
930 mutex_init(&hub
->status_mutex
);
932 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
933 if (!hub
->descriptor
) {
938 /* Request the entire hub descriptor.
939 * hub->descriptor can handle USB_MAXCHILDREN ports,
940 * but the hub can/will return fewer bytes here.
942 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
943 sizeof(*hub
->descriptor
));
945 message
= "can't read hub descriptor";
947 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
948 message
= "hub has too many ports!";
953 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
954 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
955 (hdev
->maxchild
== 1) ? "" : "s");
957 hub
->port_owners
= kzalloc(hdev
->maxchild
* sizeof(void *), GFP_KERNEL
);
958 if (!hub
->port_owners
) {
963 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
965 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
967 char portstr
[USB_MAXCHILDREN
+ 1];
969 for (i
= 0; i
< hdev
->maxchild
; i
++)
970 portstr
[i
] = hub
->descriptor
->DeviceRemovable
971 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
973 portstr
[hdev
->maxchild
] = 0;
974 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
976 dev_dbg(hub_dev
, "standalone hub\n");
978 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
980 dev_dbg(hub_dev
, "ganged power switching\n");
983 dev_dbg(hub_dev
, "individual port power switching\n");
987 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
991 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
993 dev_dbg(hub_dev
, "global over-current protection\n");
996 dev_dbg(hub_dev
, "individual port over-current protection\n");
1000 dev_dbg(hub_dev
, "no over-current protection\n");
1004 spin_lock_init (&hub
->tt
.lock
);
1005 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
1006 INIT_WORK(&hub
->tt
.clear_work
, hub_tt_work
);
1007 switch (hdev
->descriptor
.bDeviceProtocol
) {
1011 dev_dbg(hub_dev
, "Single TT\n");
1015 ret
= usb_set_interface(hdev
, 0, 1);
1017 dev_dbg(hub_dev
, "TT per port\n");
1020 dev_err(hub_dev
, "Using single TT (err %d)\n",
1025 /* USB 3.0 hubs don't have a TT */
1028 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
1029 hdev
->descriptor
.bDeviceProtocol
);
1033 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1034 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
1035 case HUB_TTTT_8_BITS
:
1036 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
1037 hub
->tt
.think_time
= 666;
1038 dev_dbg(hub_dev
, "TT requires at most %d "
1039 "FS bit times (%d ns)\n",
1040 8, hub
->tt
.think_time
);
1043 case HUB_TTTT_16_BITS
:
1044 hub
->tt
.think_time
= 666 * 2;
1045 dev_dbg(hub_dev
, "TT requires at most %d "
1046 "FS bit times (%d ns)\n",
1047 16, hub
->tt
.think_time
);
1049 case HUB_TTTT_24_BITS
:
1050 hub
->tt
.think_time
= 666 * 3;
1051 dev_dbg(hub_dev
, "TT requires at most %d "
1052 "FS bit times (%d ns)\n",
1053 24, hub
->tt
.think_time
);
1055 case HUB_TTTT_32_BITS
:
1056 hub
->tt
.think_time
= 666 * 4;
1057 dev_dbg(hub_dev
, "TT requires at most %d "
1058 "FS bit times (%d ns)\n",
1059 32, hub
->tt
.think_time
);
1063 /* probe() zeroes hub->indicator[] */
1064 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
1065 hub
->has_indicators
= 1;
1066 dev_dbg(hub_dev
, "Port indicators are supported\n");
1069 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
1070 hub
->descriptor
->bPwrOn2PwrGood
* 2);
1072 /* power budgeting mostly matters with bus-powered hubs,
1073 * and battery-powered root hubs (may provide just 8 mA).
1075 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
1077 message
= "can't get hub status";
1080 le16_to_cpus(&hubstatus
);
1081 if (hdev
== hdev
->bus
->root_hub
) {
1082 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
1083 hub
->mA_per_port
= 500;
1085 hub
->mA_per_port
= hdev
->bus_mA
;
1086 hub
->limited_power
= 1;
1088 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
1089 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
1090 hub
->descriptor
->bHubContrCurrent
);
1091 hub
->limited_power
= 1;
1092 if (hdev
->maxchild
> 0) {
1093 int remaining
= hdev
->bus_mA
-
1094 hub
->descriptor
->bHubContrCurrent
;
1096 if (remaining
< hdev
->maxchild
* 100)
1098 "insufficient power available "
1099 "to use all downstream ports\n");
1100 hub
->mA_per_port
= 100; /* 7.2.1.1 */
1102 } else { /* Self-powered external hub */
1103 /* FIXME: What about battery-powered external hubs that
1104 * provide less current per port? */
1105 hub
->mA_per_port
= 500;
1107 if (hub
->mA_per_port
< 500)
1108 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
1111 /* Update the HCD's internal representation of this hub before khubd
1112 * starts getting port status changes for devices under the hub.
1114 hcd
= bus_to_hcd(hdev
->bus
);
1115 if (hcd
->driver
->update_hub_device
) {
1116 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1117 &hub
->tt
, GFP_KERNEL
);
1119 message
= "can't update HCD hub info";
1124 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
1126 message
= "can't get hub status";
1130 /* local power status reports aren't always correct */
1131 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
1132 dev_dbg(hub_dev
, "local power source is %s\n",
1133 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
1134 ? "lost (inactive)" : "good");
1136 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
1137 dev_dbg(hub_dev
, "%sover-current condition exists\n",
1138 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
1140 /* set up the interrupt endpoint
1141 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1142 * bytes as USB2.0[11.12.3] says because some hubs are known
1143 * to send more data (and thus cause overflow). For root hubs,
1144 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1145 * to be big enough for at least USB_MAXCHILDREN ports. */
1146 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
1147 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
1149 if (maxp
> sizeof(*hub
->buffer
))
1150 maxp
= sizeof(*hub
->buffer
);
1152 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
1158 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
1159 hub
, endpoint
->bInterval
);
1161 /* maybe cycle the hub leds */
1162 if (hub
->has_indicators
&& blinkenlights
)
1163 hub
->indicator
[0] = INDICATOR_CYCLE
;
1165 hub_activate(hub
, HUB_INIT
);
1169 dev_err (hub_dev
, "config failed, %s (err %d)\n",
1171 /* hub_disconnect() frees urb and descriptor */
1175 static void hub_release(struct kref
*kref
)
1177 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1179 usb_put_intf(to_usb_interface(hub
->intfdev
));
1183 static unsigned highspeed_hubs
;
1185 static void hub_disconnect(struct usb_interface
*intf
)
1187 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1189 /* Take the hub off the event list and don't let it be added again */
1190 spin_lock_irq(&hub_event_lock
);
1191 if (!list_empty(&hub
->event_list
)) {
1192 list_del_init(&hub
->event_list
);
1193 usb_autopm_put_interface_no_suspend(intf
);
1195 hub
->disconnected
= 1;
1196 spin_unlock_irq(&hub_event_lock
);
1198 /* Disconnect all children and quiesce the hub */
1200 hub_quiesce(hub
, HUB_DISCONNECT
);
1202 usb_set_intfdata (intf
, NULL
);
1203 hub
->hdev
->maxchild
= 0;
1205 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1208 usb_free_urb(hub
->urb
);
1209 kfree(hub
->port_owners
);
1210 kfree(hub
->descriptor
);
1214 kref_put(&hub
->kref
, hub_release
);
1217 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1219 struct usb_host_interface
*desc
;
1220 struct usb_endpoint_descriptor
*endpoint
;
1221 struct usb_device
*hdev
;
1222 struct usb_hub
*hub
;
1224 desc
= intf
->cur_altsetting
;
1225 hdev
= interface_to_usbdev(intf
);
1227 if (hdev
->level
== MAX_TOPO_LEVEL
) {
1229 "Unsupported bus topology: hub nested too deep\n");
1233 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1235 dev_warn(&intf
->dev
, "ignoring external hub\n");
1240 /* Some hubs have a subclass of 1, which AFAICT according to the */
1241 /* specs is not defined, but it works */
1242 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1243 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1245 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
1249 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1250 if (desc
->desc
.bNumEndpoints
!= 1)
1251 goto descriptor_error
;
1253 endpoint
= &desc
->endpoint
[0].desc
;
1255 /* If it's not an interrupt in endpoint, we'd better punt! */
1256 if (!usb_endpoint_is_int_in(endpoint
))
1257 goto descriptor_error
;
1259 /* We found a hub */
1260 dev_info (&intf
->dev
, "USB hub found\n");
1262 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1264 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1268 kref_init(&hub
->kref
);
1269 INIT_LIST_HEAD(&hub
->event_list
);
1270 hub
->intfdev
= &intf
->dev
;
1272 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1273 INIT_DELAYED_WORK(&hub
->init_work
, NULL
);
1276 usb_set_intfdata (intf
, hub
);
1277 intf
->needs_remote_wakeup
= 1;
1279 if (hdev
->speed
== USB_SPEED_HIGH
)
1282 if (hub_configure(hub
, endpoint
) >= 0)
1285 hub_disconnect (intf
);
1290 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1292 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1294 /* assert ifno == 0 (part of hub spec) */
1296 case USBDEVFS_HUB_PORTINFO
: {
1297 struct usbdevfs_hub_portinfo
*info
= user_data
;
1300 spin_lock_irq(&device_state_lock
);
1301 if (hdev
->devnum
<= 0)
1304 info
->nports
= hdev
->maxchild
;
1305 for (i
= 0; i
< info
->nports
; i
++) {
1306 if (hdev
->children
[i
] == NULL
)
1310 hdev
->children
[i
]->devnum
;
1313 spin_unlock_irq(&device_state_lock
);
1315 return info
->nports
+ 1;
1324 * Allow user programs to claim ports on a hub. When a device is attached
1325 * to one of these "claimed" ports, the program will "own" the device.
1327 static int find_port_owner(struct usb_device
*hdev
, unsigned port1
,
1330 if (hdev
->state
== USB_STATE_NOTATTACHED
)
1332 if (port1
== 0 || port1
> hdev
->maxchild
)
1335 /* This assumes that devices not managed by the hub driver
1336 * will always have maxchild equal to 0.
1338 *ppowner
= &(hdev_to_hub(hdev
)->port_owners
[port1
- 1]);
1342 /* In the following three functions, the caller must hold hdev's lock */
1343 int usb_hub_claim_port(struct usb_device
*hdev
, unsigned port1
, void *owner
)
1348 rc
= find_port_owner(hdev
, port1
, &powner
);
1357 int usb_hub_release_port(struct usb_device
*hdev
, unsigned port1
, void *owner
)
1362 rc
= find_port_owner(hdev
, port1
, &powner
);
1365 if (*powner
!= owner
)
1371 void usb_hub_release_all_ports(struct usb_device
*hdev
, void *owner
)
1376 n
= find_port_owner(hdev
, 1, &powner
);
1378 for (; n
< hdev
->maxchild
; (++n
, ++powner
)) {
1379 if (*powner
== owner
)
1385 /* The caller must hold udev's lock */
1386 bool usb_device_is_owned(struct usb_device
*udev
)
1388 struct usb_hub
*hub
;
1390 if (udev
->state
== USB_STATE_NOTATTACHED
|| !udev
->parent
)
1392 hub
= hdev_to_hub(udev
->parent
);
1393 return !!hub
->port_owners
[udev
->portnum
- 1];
1397 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1401 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1402 if (udev
->children
[i
])
1403 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1405 if (udev
->state
== USB_STATE_SUSPENDED
) {
1406 udev
->discon_suspended
= 1;
1407 udev
->active_duration
-= jiffies
;
1409 udev
->state
= USB_STATE_NOTATTACHED
;
1413 * usb_set_device_state - change a device's current state (usbcore, hcds)
1414 * @udev: pointer to device whose state should be changed
1415 * @new_state: new state value to be stored
1417 * udev->state is _not_ fully protected by the device lock. Although
1418 * most transitions are made only while holding the lock, the state can
1419 * can change to USB_STATE_NOTATTACHED at almost any time. This
1420 * is so that devices can be marked as disconnected as soon as possible,
1421 * without having to wait for any semaphores to be released. As a result,
1422 * all changes to any device's state must be protected by the
1423 * device_state_lock spinlock.
1425 * Once a device has been added to the device tree, all changes to its state
1426 * should be made using this routine. The state should _not_ be set directly.
1428 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1429 * Otherwise udev->state is set to new_state, and if new_state is
1430 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1431 * to USB_STATE_NOTATTACHED.
1433 void usb_set_device_state(struct usb_device
*udev
,
1434 enum usb_device_state new_state
)
1436 unsigned long flags
;
1438 spin_lock_irqsave(&device_state_lock
, flags
);
1439 if (udev
->state
== USB_STATE_NOTATTACHED
)
1441 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1443 /* root hub wakeup capabilities are managed out-of-band
1444 * and may involve silicon errata ... ignore them here.
1447 if (udev
->state
== USB_STATE_SUSPENDED
1448 || new_state
== USB_STATE_SUSPENDED
)
1449 ; /* No change to wakeup settings */
1450 else if (new_state
== USB_STATE_CONFIGURED
)
1451 device_init_wakeup(&udev
->dev
,
1452 (udev
->actconfig
->desc
.bmAttributes
1453 & USB_CONFIG_ATT_WAKEUP
));
1455 device_init_wakeup(&udev
->dev
, 0);
1457 if (udev
->state
== USB_STATE_SUSPENDED
&&
1458 new_state
!= USB_STATE_SUSPENDED
)
1459 udev
->active_duration
-= jiffies
;
1460 else if (new_state
== USB_STATE_SUSPENDED
&&
1461 udev
->state
!= USB_STATE_SUSPENDED
)
1462 udev
->active_duration
+= jiffies
;
1463 udev
->state
= new_state
;
1465 recursively_mark_NOTATTACHED(udev
);
1466 spin_unlock_irqrestore(&device_state_lock
, flags
);
1468 EXPORT_SYMBOL_GPL(usb_set_device_state
);
1471 * WUSB devices are simple: they have no hubs behind, so the mapping
1472 * device <-> virtual port number becomes 1:1. Why? to simplify the
1473 * life of the device connection logic in
1474 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1475 * handshake we need to assign a temporary address in the unauthorized
1476 * space. For simplicity we use the first virtual port number found to
1477 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1478 * and that becomes it's address [X < 128] or its unauthorized address
1481 * We add 1 as an offset to the one-based USB-stack port number
1482 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1483 * 0 is reserved by USB for default address; (b) Linux's USB stack
1484 * uses always #1 for the root hub of the controller. So USB stack's
1485 * port #1, which is wusb virtual-port #0 has address #2.
1487 * Devices connected under xHCI are not as simple. The host controller
1488 * supports virtualization, so the hardware assigns device addresses and
1489 * the HCD must setup data structures before issuing a set address
1490 * command to the hardware.
1492 static void choose_address(struct usb_device
*udev
)
1495 struct usb_bus
*bus
= udev
->bus
;
1497 /* If khubd ever becomes multithreaded, this will need a lock */
1499 devnum
= udev
->portnum
+ 1;
1500 BUG_ON(test_bit(devnum
, bus
->devmap
.devicemap
));
1502 /* Try to allocate the next devnum beginning at
1503 * bus->devnum_next. */
1504 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1507 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
,
1509 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1512 set_bit(devnum
, bus
->devmap
.devicemap
);
1513 udev
->devnum
= devnum
;
1517 static void release_address(struct usb_device
*udev
)
1519 if (udev
->devnum
> 0) {
1520 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1525 static void update_address(struct usb_device
*udev
, int devnum
)
1527 /* The address for a WUSB device is managed by wusbcore. */
1529 udev
->devnum
= devnum
;
1532 #ifdef CONFIG_USB_SUSPEND
1534 static void usb_stop_pm(struct usb_device
*udev
)
1536 /* Synchronize with the ksuspend thread to prevent any more
1537 * autosuspend requests from being submitted, and decrement
1538 * the parent's count of unsuspended children.
1541 if (udev
->parent
&& !udev
->discon_suspended
)
1542 usb_autosuspend_device(udev
->parent
);
1543 usb_pm_unlock(udev
);
1545 /* Stop any autosuspend or autoresume requests already submitted */
1546 cancel_delayed_work_sync(&udev
->autosuspend
);
1547 cancel_work_sync(&udev
->autoresume
);
1552 static inline void usb_stop_pm(struct usb_device
*udev
)
1558 * usb_disconnect - disconnect a device (usbcore-internal)
1559 * @pdev: pointer to device being disconnected
1560 * Context: !in_interrupt ()
1562 * Something got disconnected. Get rid of it and all of its children.
1564 * If *pdev is a normal device then the parent hub must already be locked.
1565 * If *pdev is a root hub then this routine will acquire the
1566 * usb_bus_list_lock on behalf of the caller.
1568 * Only hub drivers (including virtual root hub drivers for host
1569 * controllers) should ever call this.
1571 * This call is synchronous, and may not be used in an interrupt context.
1573 void usb_disconnect(struct usb_device
**pdev
)
1575 struct usb_device
*udev
= *pdev
;
1579 pr_debug ("%s nodev\n", __func__
);
1583 /* mark the device as inactive, so any further urb submissions for
1584 * this device (and any of its children) will fail immediately.
1585 * this quiesces everyting except pending urbs.
1587 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1588 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1590 usb_lock_device(udev
);
1592 /* Free up all the children before we remove this device */
1593 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1594 if (udev
->children
[i
])
1595 usb_disconnect(&udev
->children
[i
]);
1598 /* deallocate hcd/hardware state ... nuking all pending urbs and
1599 * cleaning up all state associated with the current configuration
1600 * so that the hardware is now fully quiesced.
1602 dev_dbg (&udev
->dev
, "unregistering device\n");
1603 usb_disable_device(udev
, 0);
1604 usb_hcd_synchronize_unlinks(udev
);
1606 usb_remove_ep_devs(&udev
->ep0
);
1607 usb_unlock_device(udev
);
1609 /* Unregister the device. The device driver is responsible
1610 * for de-configuring the device and invoking the remove-device
1611 * notifier chain (used by usbfs and possibly others).
1613 device_del(&udev
->dev
);
1615 /* Free the device number and delete the parent's children[]
1616 * (or root_hub) pointer.
1618 release_address(udev
);
1620 /* Avoid races with recursively_mark_NOTATTACHED() */
1621 spin_lock_irq(&device_state_lock
);
1623 spin_unlock_irq(&device_state_lock
);
1627 put_device(&udev
->dev
);
1630 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1631 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1635 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1638 static void announce_device(struct usb_device
*udev
)
1640 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1641 le16_to_cpu(udev
->descriptor
.idVendor
),
1642 le16_to_cpu(udev
->descriptor
.idProduct
));
1643 dev_info(&udev
->dev
,
1644 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1645 udev
->descriptor
.iManufacturer
,
1646 udev
->descriptor
.iProduct
,
1647 udev
->descriptor
.iSerialNumber
);
1648 show_string(udev
, "Product", udev
->product
);
1649 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1650 show_string(udev
, "SerialNumber", udev
->serial
);
1653 static inline void announce_device(struct usb_device
*udev
) { }
1656 #ifdef CONFIG_USB_OTG
1657 #include "otg_whitelist.h"
1661 * usb_enumerate_device_otg - FIXME (usbcore-internal)
1662 * @udev: newly addressed device (in ADDRESS state)
1664 * Finish enumeration for On-The-Go devices
1666 static int usb_enumerate_device_otg(struct usb_device
*udev
)
1670 #ifdef CONFIG_USB_OTG
1672 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1673 * to wake us after we've powered off VBUS; and HNP, switching roles
1674 * "host" to "peripheral". The OTG descriptor helps figure this out.
1676 if (!udev
->bus
->is_b_host
1678 && udev
->parent
== udev
->bus
->root_hub
) {
1679 struct usb_otg_descriptor
*desc
= NULL
;
1680 struct usb_bus
*bus
= udev
->bus
;
1682 /* descriptor may appear anywhere in config */
1683 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1684 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1685 USB_DT_OTG
, (void **) &desc
) == 0) {
1686 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1687 unsigned port1
= udev
->portnum
;
1689 dev_info(&udev
->dev
,
1690 "Dual-Role OTG device on %sHNP port\n",
1691 (port1
== bus
->otg_port
)
1694 /* enable HNP before suspend, it's simpler */
1695 if (port1
== bus
->otg_port
)
1696 bus
->b_hnp_enable
= 1;
1697 err
= usb_control_msg(udev
,
1698 usb_sndctrlpipe(udev
, 0),
1699 USB_REQ_SET_FEATURE
, 0,
1701 ? USB_DEVICE_B_HNP_ENABLE
1702 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1703 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1705 /* OTG MESSAGE: report errors here,
1706 * customize to match your product.
1708 dev_info(&udev
->dev
,
1709 "can't set HNP mode: %d\n",
1711 bus
->b_hnp_enable
= 0;
1717 if (!is_targeted(udev
)) {
1719 /* Maybe it can talk to us, though we can't talk to it.
1720 * (Includes HNP test device.)
1722 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1723 err
= usb_port_suspend(udev
, PMSG_SUSPEND
);
1725 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1737 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
1738 * @udev: newly addressed device (in ADDRESS state)
1740 * This is only called by usb_new_device() and usb_authorize_device()
1741 * and FIXME -- all comments that apply to them apply here wrt to
1744 * If the device is WUSB and not authorized, we don't attempt to read
1745 * the string descriptors, as they will be errored out by the device
1746 * until it has been authorized.
1748 static int usb_enumerate_device(struct usb_device
*udev
)
1752 if (udev
->config
== NULL
) {
1753 err
= usb_get_configuration(udev
);
1755 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1760 if (udev
->wusb
== 1 && udev
->authorized
== 0) {
1761 udev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1762 udev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1763 udev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1766 /* read the standard strings and cache them if present */
1767 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1768 udev
->manufacturer
= usb_cache_string(udev
,
1769 udev
->descriptor
.iManufacturer
);
1770 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1772 err
= usb_enumerate_device_otg(udev
);
1779 * usb_new_device - perform initial device setup (usbcore-internal)
1780 * @udev: newly addressed device (in ADDRESS state)
1782 * This is called with devices which have been detected but not fully
1783 * enumerated. The device descriptor is available, but not descriptors
1784 * for any device configuration. The caller must have locked either
1785 * the parent hub (if udev is a normal device) or else the
1786 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1787 * udev has already been installed, but udev is not yet visible through
1788 * sysfs or other filesystem code.
1790 * It will return if the device is configured properly or not. Zero if
1791 * the interface was registered with the driver core; else a negative
1794 * This call is synchronous, and may not be used in an interrupt context.
1796 * Only the hub driver or root-hub registrar should ever call this.
1798 int usb_new_device(struct usb_device
*udev
)
1802 /* Increment the parent's count of unsuspended children */
1804 usb_autoresume_device(udev
->parent
);
1806 usb_detect_quirks(udev
);
1807 err
= usb_enumerate_device(udev
); /* Read descriptors */
1810 dev_dbg(&udev
->dev
, "udev %d, busnum %d, minor = %d\n",
1811 udev
->devnum
, udev
->bus
->busnum
,
1812 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1813 /* export the usbdev device-node for libusb */
1814 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1815 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1817 /* Tell the world! */
1818 announce_device(udev
);
1820 /* Register the device. The device driver is responsible
1821 * for configuring the device and invoking the add-device
1822 * notifier chain (used by usbfs and possibly others).
1824 err
= device_add(&udev
->dev
);
1826 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1830 (void) usb_create_ep_devs(&udev
->dev
, &udev
->ep0
, udev
);
1834 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1841 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1842 * @usb_dev: USB device
1844 * Move the USB device to a very basic state where interfaces are disabled
1845 * and the device is in fact unconfigured and unusable.
1847 * We share a lock (that we have) with device_del(), so we need to
1850 int usb_deauthorize_device(struct usb_device
*usb_dev
)
1853 usb_lock_device(usb_dev
);
1854 if (usb_dev
->authorized
== 0)
1855 goto out_unauthorized
;
1856 usb_dev
->authorized
= 0;
1857 usb_set_configuration(usb_dev
, -1);
1858 usb_dev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1859 usb_dev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1860 usb_dev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1861 kfree(usb_dev
->config
);
1862 usb_dev
->config
= NULL
;
1863 for (cnt
= 0; cnt
< usb_dev
->descriptor
.bNumConfigurations
; cnt
++)
1864 kfree(usb_dev
->rawdescriptors
[cnt
]);
1865 usb_dev
->descriptor
.bNumConfigurations
= 0;
1866 kfree(usb_dev
->rawdescriptors
);
1868 usb_unlock_device(usb_dev
);
1873 int usb_authorize_device(struct usb_device
*usb_dev
)
1876 usb_lock_device(usb_dev
);
1877 if (usb_dev
->authorized
== 1)
1878 goto out_authorized
;
1879 kfree(usb_dev
->product
);
1880 usb_dev
->product
= NULL
;
1881 kfree(usb_dev
->manufacturer
);
1882 usb_dev
->manufacturer
= NULL
;
1883 kfree(usb_dev
->serial
);
1884 usb_dev
->serial
= NULL
;
1885 result
= usb_autoresume_device(usb_dev
);
1887 dev_err(&usb_dev
->dev
,
1888 "can't autoresume for authorization: %d\n", result
);
1889 goto error_autoresume
;
1891 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
1893 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
1894 "authorization: %d\n", result
);
1895 goto error_device_descriptor
;
1897 usb_dev
->authorized
= 1;
1898 result
= usb_enumerate_device(usb_dev
);
1900 goto error_enumerate
;
1901 /* Choose and set the configuration. This registers the interfaces
1902 * with the driver core and lets interface drivers bind to them.
1904 c
= usb_choose_configuration(usb_dev
);
1906 result
= usb_set_configuration(usb_dev
, c
);
1908 dev_err(&usb_dev
->dev
,
1909 "can't set config #%d, error %d\n", c
, result
);
1910 /* This need not be fatal. The user can try to
1911 * set other configurations. */
1914 dev_info(&usb_dev
->dev
, "authorized to connect\n");
1916 error_device_descriptor
:
1919 usb_unlock_device(usb_dev
); // complements locktree
1924 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1925 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1927 struct usb_hcd
*hcd
;
1928 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1930 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1931 return hcd
->wireless
;
1935 #define PORT_RESET_TRIES 5
1936 #define SET_ADDRESS_TRIES 2
1937 #define GET_DESCRIPTOR_TRIES 2
1938 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1939 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1941 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1942 #define HUB_SHORT_RESET_TIME 10
1943 #define HUB_LONG_RESET_TIME 200
1944 #define HUB_RESET_TIMEOUT 500
1946 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1947 struct usb_device
*udev
, unsigned int delay
)
1949 int delay_time
, ret
;
1953 for (delay_time
= 0;
1954 delay_time
< HUB_RESET_TIMEOUT
;
1955 delay_time
+= delay
) {
1956 /* wait to give the device a chance to reset */
1959 /* read and decode port status */
1960 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1964 /* Device went away? */
1965 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1968 /* bomb out completely if the connection bounced */
1969 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1972 /* if we`ve finished resetting, then break out of the loop */
1973 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1974 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1975 if (hub_is_wusb(hub
))
1976 udev
->speed
= USB_SPEED_VARIABLE
;
1977 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1978 udev
->speed
= USB_SPEED_HIGH
;
1979 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1980 udev
->speed
= USB_SPEED_LOW
;
1982 udev
->speed
= USB_SPEED_FULL
;
1986 /* switch to the long delay after two short delay failures */
1987 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1988 delay
= HUB_LONG_RESET_TIME
;
1990 dev_dbg (hub
->intfdev
,
1991 "port %d not reset yet, waiting %dms\n",
1998 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1999 struct usb_device
*udev
, unsigned int delay
)
2003 /* Block EHCI CF initialization during the port reset.
2004 * Some companion controllers don't like it when they mix.
2006 down_read(&ehci_cf_port_reset_rwsem
);
2008 /* Reset the port */
2009 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
2010 status
= set_port_feature(hub
->hdev
,
2011 port1
, USB_PORT_FEAT_RESET
);
2013 dev_err(hub
->intfdev
,
2014 "cannot reset port %d (err = %d)\n",
2017 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
2018 if (status
&& status
!= -ENOTCONN
)
2019 dev_dbg(hub
->intfdev
,
2020 "port_wait_reset: err = %d\n",
2024 /* return on disconnect or reset */
2027 /* TRSTRCY = 10 ms; plus some extra */
2029 update_address(udev
, 0);
2033 clear_port_feature(hub
->hdev
,
2034 port1
, USB_PORT_FEAT_C_RESET
);
2035 /* FIXME need disconnect() for NOTATTACHED device */
2036 usb_set_device_state(udev
, status
2037 ? USB_STATE_NOTATTACHED
2038 : USB_STATE_DEFAULT
);
2042 dev_dbg (hub
->intfdev
,
2043 "port %d not enabled, trying reset again...\n",
2045 delay
= HUB_LONG_RESET_TIME
;
2048 dev_err (hub
->intfdev
,
2049 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2053 up_read(&ehci_cf_port_reset_rwsem
);
2059 #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
2060 USB_PORT_STAT_SUSPEND)
2061 #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
2063 /* Determine whether the device on a port is ready for a normal resume,
2064 * is ready for a reset-resume, or should be disconnected.
2066 static int check_port_resume_type(struct usb_device
*udev
,
2067 struct usb_hub
*hub
, int port1
,
2068 int status
, unsigned portchange
, unsigned portstatus
)
2070 /* Is the device still present? */
2071 if (status
|| (portstatus
& MASK_BITS
) != WANT_BITS
) {
2076 /* Can't do a normal resume if the port isn't enabled,
2077 * so try a reset-resume instead.
2079 else if (!(portstatus
& USB_PORT_STAT_ENABLE
) && !udev
->reset_resume
) {
2080 if (udev
->persist_enabled
)
2081 udev
->reset_resume
= 1;
2087 dev_dbg(hub
->intfdev
,
2088 "port %d status %04x.%04x after resume, %d\n",
2089 port1
, portchange
, portstatus
, status
);
2090 } else if (udev
->reset_resume
) {
2092 /* Late port handoff can set status-change bits */
2093 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
2094 clear_port_feature(hub
->hdev
, port1
,
2095 USB_PORT_FEAT_C_CONNECTION
);
2096 if (portchange
& USB_PORT_STAT_C_ENABLE
)
2097 clear_port_feature(hub
->hdev
, port1
,
2098 USB_PORT_FEAT_C_ENABLE
);
2104 #ifdef CONFIG_USB_SUSPEND
2107 * usb_port_suspend - suspend a usb device's upstream port
2108 * @udev: device that's no longer in active use, not a root hub
2109 * Context: must be able to sleep; device not locked; pm locks held
2111 * Suspends a USB device that isn't in active use, conserving power.
2112 * Devices may wake out of a suspend, if anything important happens,
2113 * using the remote wakeup mechanism. They may also be taken out of
2114 * suspend by the host, using usb_port_resume(). It's also routine
2115 * to disconnect devices while they are suspended.
2117 * This only affects the USB hardware for a device; its interfaces
2118 * (and, for hubs, child devices) must already have been suspended.
2120 * Selective port suspend reduces power; most suspended devices draw
2121 * less than 500 uA. It's also used in OTG, along with remote wakeup.
2122 * All devices below the suspended port are also suspended.
2124 * Devices leave suspend state when the host wakes them up. Some devices
2125 * also support "remote wakeup", where the device can activate the USB
2126 * tree above them to deliver data, such as a keypress or packet. In
2127 * some cases, this wakes the USB host.
2129 * Suspending OTG devices may trigger HNP, if that's been enabled
2130 * between a pair of dual-role devices. That will change roles, such
2131 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2133 * Devices on USB hub ports have only one "suspend" state, corresponding
2134 * to ACPI D2, "may cause the device to lose some context".
2135 * State transitions include:
2137 * - suspend, resume ... when the VBUS power link stays live
2138 * - suspend, disconnect ... VBUS lost
2140 * Once VBUS drop breaks the circuit, the port it's using has to go through
2141 * normal re-enumeration procedures, starting with enabling VBUS power.
2142 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2143 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
2144 * timer, no SRP, no requests through sysfs.
2146 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
2147 * the root hub for their bus goes into global suspend ... so we don't
2148 * (falsely) update the device power state to say it suspended.
2150 * Returns 0 on success, else negative errno.
2152 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
2154 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2155 int port1
= udev
->portnum
;
2158 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
2160 /* enable remote wakeup when appropriate; this lets the device
2161 * wake up the upstream hub (including maybe the root hub).
2163 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
2164 * we don't explicitly enable it here.
2166 if (udev
->do_remote_wakeup
) {
2167 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2168 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
2169 USB_DEVICE_REMOTE_WAKEUP
, 0,
2171 USB_CTRL_SET_TIMEOUT
);
2173 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
2175 /* bail if autosuspend is requested */
2176 if (msg
.event
& PM_EVENT_AUTO
)
2182 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
2184 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
2186 /* paranoia: "should not happen" */
2187 if (udev
->do_remote_wakeup
)
2188 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2189 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
2190 USB_DEVICE_REMOTE_WAKEUP
, 0,
2192 USB_CTRL_SET_TIMEOUT
);
2194 /* device has up to 10 msec to fully suspend */
2195 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
2196 (msg
.event
& PM_EVENT_AUTO
? "auto-" : ""));
2197 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
2204 * If the USB "suspend" state is in use (rather than "global suspend"),
2205 * many devices will be individually taken out of suspend state using
2206 * special "resume" signaling. This routine kicks in shortly after
2207 * hardware resume signaling is finished, either because of selective
2208 * resume (by host) or remote wakeup (by device) ... now see what changed
2209 * in the tree that's rooted at this device.
2211 * If @udev->reset_resume is set then the device is reset before the
2212 * status check is done.
2214 static int finish_port_resume(struct usb_device
*udev
)
2219 /* caller owns the udev device lock */
2220 dev_dbg(&udev
->dev
, "%s\n",
2221 udev
->reset_resume
? "finish reset-resume" : "finish resume");
2223 /* usb ch9 identifies four variants of SUSPENDED, based on what
2224 * state the device resumes to. Linux currently won't see the
2225 * first two on the host side; they'd be inside hub_port_init()
2226 * during many timeouts, but khubd can't suspend until later.
2228 usb_set_device_state(udev
, udev
->actconfig
2229 ? USB_STATE_CONFIGURED
2230 : USB_STATE_ADDRESS
);
2232 /* 10.5.4.5 says not to reset a suspended port if the attached
2233 * device is enabled for remote wakeup. Hence the reset
2234 * operation is carried out here, after the port has been
2237 if (udev
->reset_resume
)
2239 status
= usb_reset_and_verify_device(udev
);
2241 /* 10.5.4.5 says be sure devices in the tree are still there.
2242 * For now let's assume the device didn't go crazy on resume,
2243 * and device drivers will know about any resume quirks.
2247 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
2249 status
= (status
> 0 ? 0 : -ENODEV
);
2251 /* If a normal resume failed, try doing a reset-resume */
2252 if (status
&& !udev
->reset_resume
&& udev
->persist_enabled
) {
2253 dev_dbg(&udev
->dev
, "retry with reset-resume\n");
2254 udev
->reset_resume
= 1;
2255 goto retry_reset_resume
;
2260 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
2262 } else if (udev
->actconfig
) {
2263 le16_to_cpus(&devstatus
);
2264 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
2265 status
= usb_control_msg(udev
,
2266 usb_sndctrlpipe(udev
, 0),
2267 USB_REQ_CLEAR_FEATURE
,
2269 USB_DEVICE_REMOTE_WAKEUP
, 0,
2271 USB_CTRL_SET_TIMEOUT
);
2274 "disable remote wakeup, status %d\n",
2283 * usb_port_resume - re-activate a suspended usb device's upstream port
2284 * @udev: device to re-activate, not a root hub
2285 * Context: must be able to sleep; device not locked; pm locks held
2287 * This will re-activate the suspended device, increasing power usage
2288 * while letting drivers communicate again with its endpoints.
2289 * USB resume explicitly guarantees that the power session between
2290 * the host and the device is the same as it was when the device
2293 * If @udev->reset_resume is set then this routine won't check that the
2294 * port is still enabled. Furthermore, finish_port_resume() above will
2295 * reset @udev. The end result is that a broken power session can be
2296 * recovered and @udev will appear to persist across a loss of VBUS power.
2298 * For example, if a host controller doesn't maintain VBUS suspend current
2299 * during a system sleep or is reset when the system wakes up, all the USB
2300 * power sessions below it will be broken. This is especially troublesome
2301 * for mass-storage devices containing mounted filesystems, since the
2302 * device will appear to have disconnected and all the memory mappings
2303 * to it will be lost. Using the USB_PERSIST facility, the device can be
2304 * made to appear as if it had not disconnected.
2306 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
2307 * every effort to insure that the same device is present after the
2308 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2309 * quite possible for a device to remain unaltered but its media to be
2310 * changed. If the user replaces a flash memory card while the system is
2311 * asleep, he will have only himself to blame when the filesystem on the
2312 * new card is corrupted and the system crashes.
2314 * Returns 0 on success, else negative errno.
2316 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
2318 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2319 int port1
= udev
->portnum
;
2321 u16 portchange
, portstatus
;
2323 /* Skip the initial Clear-Suspend step for a remote wakeup */
2324 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2325 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
2326 goto SuspendCleared
;
2328 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2330 set_bit(port1
, hub
->busy_bits
);
2332 /* see 7.1.7.7; affects power usage, but not budgeting */
2333 status
= clear_port_feature(hub
->hdev
,
2334 port1
, USB_PORT_FEAT_SUSPEND
);
2336 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
2339 /* drive resume for at least 20 msec */
2340 dev_dbg(&udev
->dev
, "usb %sresume\n",
2341 (msg
.event
& PM_EVENT_AUTO
? "auto-" : ""));
2344 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2345 * stop resume signaling. Then finish the resume
2348 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2350 /* TRSMRCY = 10 msec */
2356 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
2357 clear_port_feature(hub
->hdev
, port1
,
2358 USB_PORT_FEAT_C_SUSPEND
);
2361 clear_bit(port1
, hub
->busy_bits
);
2363 status
= check_port_resume_type(udev
,
2364 hub
, port1
, status
, portchange
, portstatus
);
2366 status
= finish_port_resume(udev
);
2368 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2369 hub_port_logical_disconnect(hub
, port1
);
2374 /* caller has locked udev */
2375 static int remote_wakeup(struct usb_device
*udev
)
2379 if (udev
->state
== USB_STATE_SUSPENDED
) {
2380 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
2381 usb_mark_last_busy(udev
);
2382 status
= usb_external_resume_device(udev
, PMSG_REMOTE_RESUME
);
2387 #else /* CONFIG_USB_SUSPEND */
2389 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2391 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
2396 /* However we may need to do a reset-resume */
2398 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
2400 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2401 int port1
= udev
->portnum
;
2403 u16 portchange
, portstatus
;
2405 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2406 status
= check_port_resume_type(udev
,
2407 hub
, port1
, status
, portchange
, portstatus
);
2410 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2411 hub_port_logical_disconnect(hub
, port1
);
2412 } else if (udev
->reset_resume
) {
2413 dev_dbg(&udev
->dev
, "reset-resume\n");
2414 status
= usb_reset_and_verify_device(udev
);
2419 static inline int remote_wakeup(struct usb_device
*udev
)
2426 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
2428 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2429 struct usb_device
*hdev
= hub
->hdev
;
2432 /* fail if children aren't already suspended */
2433 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
2434 struct usb_device
*udev
;
2436 udev
= hdev
->children
[port1
-1];
2437 if (udev
&& udev
->can_submit
) {
2438 if (!(msg
.event
& PM_EVENT_AUTO
))
2439 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
2445 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2447 /* stop khubd and related activity */
2448 hub_quiesce(hub
, HUB_SUSPEND
);
2452 static int hub_resume(struct usb_interface
*intf
)
2454 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2456 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2457 hub_activate(hub
, HUB_RESUME
);
2461 static int hub_reset_resume(struct usb_interface
*intf
)
2463 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2465 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2466 hub_activate(hub
, HUB_RESET_RESUME
);
2471 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2472 * @rhdev: struct usb_device for the root hub
2474 * The USB host controller driver calls this function when its root hub
2475 * is resumed and Vbus power has been interrupted or the controller
2476 * has been reset. The routine marks @rhdev as having lost power.
2477 * When the hub driver is resumed it will take notice and carry out
2478 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2479 * the others will be disconnected.
2481 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
2483 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
2484 rhdev
->reset_resume
= 1;
2486 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
2488 #else /* CONFIG_PM */
2490 static inline int remote_wakeup(struct usb_device
*udev
)
2495 #define hub_suspend NULL
2496 #define hub_resume NULL
2497 #define hub_reset_resume NULL
2501 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2503 * Between connect detection and reset signaling there must be a delay
2504 * of 100ms at least for debounce and power-settling. The corresponding
2505 * timer shall restart whenever the downstream port detects a disconnect.
2507 * Apparently there are some bluetooth and irda-dongles and a number of
2508 * low-speed devices for which this debounce period may last over a second.
2509 * Not covered by the spec - but easy to deal with.
2511 * This implementation uses a 1500ms total debounce timeout; if the
2512 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2513 * every 25ms for transient disconnects. When the port status has been
2514 * unchanged for 100ms it returns the port status.
2516 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2519 int total_time
, stable_time
= 0;
2520 u16 portchange
, portstatus
;
2521 unsigned connection
= 0xffff;
2523 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2524 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2528 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2529 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2530 stable_time
+= HUB_DEBOUNCE_STEP
;
2531 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2535 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2538 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2539 clear_port_feature(hub
->hdev
, port1
,
2540 USB_PORT_FEAT_C_CONNECTION
);
2543 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2545 msleep(HUB_DEBOUNCE_STEP
);
2548 dev_dbg (hub
->intfdev
,
2549 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2550 port1
, total_time
, stable_time
, portstatus
);
2552 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2557 void usb_ep0_reinit(struct usb_device
*udev
)
2559 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
, true);
2560 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
, true);
2561 usb_enable_endpoint(udev
, &udev
->ep0
, true);
2563 EXPORT_SYMBOL_GPL(usb_ep0_reinit
);
2565 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2566 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2568 static int hub_set_address(struct usb_device
*udev
, int devnum
)
2571 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2574 * The host controller will choose the device address,
2575 * instead of the core having chosen it earlier
2577 if (!hcd
->driver
->address_device
&& devnum
<= 1)
2579 if (udev
->state
== USB_STATE_ADDRESS
)
2581 if (udev
->state
!= USB_STATE_DEFAULT
)
2583 if (hcd
->driver
->address_device
) {
2584 retval
= hcd
->driver
->address_device(hcd
, udev
);
2586 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2587 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
2588 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2590 update_address(udev
, devnum
);
2593 /* Device now using proper address. */
2594 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2595 usb_ep0_reinit(udev
);
2600 /* Reset device, (re)assign address, get device descriptor.
2601 * Device connection must be stable, no more debouncing needed.
2602 * Returns device in USB_STATE_ADDRESS, except on error.
2604 * If this is called for an already-existing device (as part of
2605 * usb_reset_and_verify_device), the caller must own the device lock. For a
2606 * newly detected device that is not accessible through any global
2607 * pointers, it's not necessary to lock the device.
2610 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2613 static DEFINE_MUTEX(usb_address0_mutex
);
2615 struct usb_device
*hdev
= hub
->hdev
;
2616 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2618 unsigned delay
= HUB_SHORT_RESET_TIME
;
2619 enum usb_device_speed oldspeed
= udev
->speed
;
2621 int devnum
= udev
->devnum
;
2623 /* root hub ports have a slightly longer reset period
2624 * (from USB 2.0 spec, section 7.1.7.5)
2626 if (!hdev
->parent
) {
2627 delay
= HUB_ROOT_RESET_TIME
;
2628 if (port1
== hdev
->bus
->otg_port
)
2629 hdev
->bus
->b_hnp_enable
= 0;
2632 /* Some low speed devices have problems with the quick delay, so */
2633 /* be a bit pessimistic with those devices. RHbug #23670 */
2634 if (oldspeed
== USB_SPEED_LOW
)
2635 delay
= HUB_LONG_RESET_TIME
;
2637 mutex_lock(&usb_address0_mutex
);
2639 if ((hcd
->driver
->flags
& HCD_USB3
) && udev
->config
) {
2640 /* FIXME this will need special handling by the xHCI driver. */
2642 "xHCI reset of configured device "
2643 "not supported yet.\n");
2646 } else if (!udev
->config
&& oldspeed
== USB_SPEED_SUPER
) {
2647 /* Don't reset USB 3.0 devices during an initial setup */
2648 usb_set_device_state(udev
, USB_STATE_DEFAULT
);
2650 /* Reset the device; full speed may morph to high speed */
2651 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
2652 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2653 if (retval
< 0) /* error or disconnect */
2655 /* success, speed is known */
2659 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2660 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2663 oldspeed
= udev
->speed
;
2665 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2666 * it's fixed size except for full speed devices.
2667 * For Wireless USB devices, ep0 max packet is always 512 (tho
2668 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2670 switch (udev
->speed
) {
2671 case USB_SPEED_SUPER
:
2672 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2673 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(512);
2675 case USB_SPEED_HIGH
: /* fixed at 64 */
2676 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
2678 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2679 /* to determine the ep0 maxpacket size, try to read
2680 * the device descriptor to get bMaxPacketSize0 and
2681 * then correct our initial guess.
2683 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
2685 case USB_SPEED_LOW
: /* fixed at 8 */
2686 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(8);
2693 switch (udev
->speed
) {
2694 case USB_SPEED_LOW
: speed
= "low"; break;
2695 case USB_SPEED_FULL
: speed
= "full"; break;
2696 case USB_SPEED_HIGH
: speed
= "high"; break;
2697 case USB_SPEED_SUPER
:
2700 case USB_SPEED_VARIABLE
:
2704 default: speed
= "?"; break;
2706 if (udev
->speed
!= USB_SPEED_SUPER
)
2707 dev_info(&udev
->dev
,
2708 "%s %s speed %sUSB device using %s and address %d\n",
2709 (udev
->config
) ? "reset" : "new", speed
, type
,
2710 udev
->bus
->controller
->driver
->name
, devnum
);
2712 /* Set up TT records, if needed */
2714 udev
->tt
= hdev
->tt
;
2715 udev
->ttport
= hdev
->ttport
;
2716 } else if (udev
->speed
!= USB_SPEED_HIGH
2717 && hdev
->speed
== USB_SPEED_HIGH
) {
2718 udev
->tt
= &hub
->tt
;
2719 udev
->ttport
= port1
;
2722 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2723 * Because device hardware and firmware is sometimes buggy in
2724 * this area, and this is how Linux has done it for ages.
2725 * Change it cautiously.
2727 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2728 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2729 * so it may help with some non-standards-compliant devices.
2730 * Otherwise we start with SET_ADDRESS and then try to read the
2731 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2734 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2736 * An xHCI controller cannot send any packets to a device until
2737 * a set address command successfully completes.
2739 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
)) {
2740 struct usb_device_descriptor
*buf
;
2743 #define GET_DESCRIPTOR_BUFSIZE 64
2744 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2750 /* Retry on all errors; some devices are flakey.
2751 * 255 is for WUSB devices, we actually need to use
2752 * 512 (WUSB1.0[4.8.1]).
2754 for (j
= 0; j
< 3; ++j
) {
2755 buf
->bMaxPacketSize0
= 0;
2756 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2757 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2758 USB_DT_DEVICE
<< 8, 0,
2759 buf
, GET_DESCRIPTOR_BUFSIZE
,
2760 initial_descriptor_timeout
);
2761 switch (buf
->bMaxPacketSize0
) {
2762 case 8: case 16: case 32: case 64: case 255:
2763 if (buf
->bDescriptorType
==
2777 udev
->descriptor
.bMaxPacketSize0
=
2778 buf
->bMaxPacketSize0
;
2781 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2782 if (retval
< 0) /* error or disconnect */
2784 if (oldspeed
!= udev
->speed
) {
2786 "device reset changed speed!\n");
2792 "device descriptor read/64, error %d\n",
2797 #undef GET_DESCRIPTOR_BUFSIZE
2801 * If device is WUSB, we already assigned an
2802 * unauthorized address in the Connect Ack sequence;
2803 * authorization will assign the final address.
2805 if (udev
->wusb
== 0) {
2806 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2807 retval
= hub_set_address(udev
, devnum
);
2814 "device not accepting address %d, error %d\n",
2818 if (udev
->speed
== USB_SPEED_SUPER
) {
2819 devnum
= udev
->devnum
;
2820 dev_info(&udev
->dev
,
2821 "%s SuperSpeed USB device using %s and address %d\n",
2822 (udev
->config
) ? "reset" : "new",
2823 udev
->bus
->controller
->driver
->name
, devnum
);
2826 /* cope with hardware quirkiness:
2827 * - let SET_ADDRESS settle, some device hardware wants it
2828 * - read ep0 maxpacket even for high and low speed,
2831 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
))
2835 retval
= usb_get_device_descriptor(udev
, 8);
2838 "device descriptor read/8, error %d\n",
2850 if (udev
->descriptor
.bMaxPacketSize0
== 0xff ||
2851 udev
->speed
== USB_SPEED_SUPER
)
2854 i
= udev
->descriptor
.bMaxPacketSize0
;
2855 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2856 if (udev
->speed
!= USB_SPEED_FULL
||
2857 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2858 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2862 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2863 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2864 usb_ep0_reinit(udev
);
2867 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2868 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2869 dev_err(&udev
->dev
, "device descriptor read/all, error %d\n",
2880 hub_port_disable(hub
, port1
, 0);
2881 update_address(udev
, devnum
); /* for disconnect processing */
2883 mutex_unlock(&usb_address0_mutex
);
2888 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2890 struct usb_qualifier_descriptor
*qual
;
2893 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2897 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2898 qual
, sizeof *qual
);
2899 if (status
== sizeof *qual
) {
2900 dev_info(&udev
->dev
, "not running at top speed; "
2901 "connect to a high speed hub\n");
2902 /* hub LEDs are probably harder to miss than syslog */
2903 if (hub
->has_indicators
) {
2904 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2905 schedule_delayed_work (&hub
->leds
, 0);
2912 hub_power_remaining (struct usb_hub
*hub
)
2914 struct usb_device
*hdev
= hub
->hdev
;
2918 if (!hub
->limited_power
)
2921 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2922 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2923 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2929 /* Unconfigured devices may not use more than 100mA,
2930 * or 8mA for OTG ports */
2931 if (udev
->actconfig
)
2932 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2933 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2937 if (delta
> hub
->mA_per_port
)
2938 dev_warn(&udev
->dev
,
2939 "%dmA is over %umA budget for port %d!\n",
2940 delta
, hub
->mA_per_port
, port1
);
2943 if (remaining
< 0) {
2944 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2951 /* Handle physical or logical connection change events.
2952 * This routine is called when:
2953 * a port connection-change occurs;
2954 * a port enable-change occurs (often caused by EMI);
2955 * usb_reset_and_verify_device() encounters changed descriptors (as from
2956 * a firmware download)
2957 * caller already locked the hub
2959 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2960 u16 portstatus
, u16 portchange
)
2962 struct usb_device
*hdev
= hub
->hdev
;
2963 struct device
*hub_dev
= hub
->intfdev
;
2964 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2965 unsigned wHubCharacteristics
=
2966 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2967 struct usb_device
*udev
;
2971 "port %d, status %04x, change %04x, %s\n",
2972 port1
, portstatus
, portchange
, portspeed (portstatus
));
2974 if (hub
->has_indicators
) {
2975 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2976 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2979 #ifdef CONFIG_USB_OTG
2980 /* during HNP, don't repeat the debounce */
2981 if (hdev
->bus
->is_b_host
)
2982 portchange
&= ~(USB_PORT_STAT_C_CONNECTION
|
2983 USB_PORT_STAT_C_ENABLE
);
2986 /* Try to resuscitate an existing device */
2987 udev
= hdev
->children
[port1
-1];
2988 if ((portstatus
& USB_PORT_STAT_CONNECTION
) && udev
&&
2989 udev
->state
!= USB_STATE_NOTATTACHED
) {
2990 usb_lock_device(udev
);
2991 if (portstatus
& USB_PORT_STAT_ENABLE
) {
2992 status
= 0; /* Nothing to do */
2994 #ifdef CONFIG_USB_SUSPEND
2995 } else if (udev
->state
== USB_STATE_SUSPENDED
&&
2996 udev
->persist_enabled
) {
2997 /* For a suspended device, treat this as a
2998 * remote wakeup event.
3000 status
= remote_wakeup(udev
);
3004 status
= -ENODEV
; /* Don't resuscitate */
3006 usb_unlock_device(udev
);
3009 clear_bit(port1
, hub
->change_bits
);
3014 /* Disconnect any existing devices under this port */
3016 usb_disconnect(&hdev
->children
[port1
-1]);
3017 clear_bit(port1
, hub
->change_bits
);
3019 /* We can forget about a "removed" device when there's a physical
3020 * disconnect or the connect status changes.
3022 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
3023 (portchange
& USB_PORT_STAT_C_CONNECTION
))
3024 clear_bit(port1
, hub
->removed_bits
);
3026 if (portchange
& (USB_PORT_STAT_C_CONNECTION
|
3027 USB_PORT_STAT_C_ENABLE
)) {
3028 status
= hub_port_debounce(hub
, port1
);
3030 if (printk_ratelimit())
3031 dev_err(hub_dev
, "connect-debounce failed, "
3032 "port %d disabled\n", port1
);
3033 portstatus
&= ~USB_PORT_STAT_CONNECTION
;
3035 portstatus
= status
;
3039 /* Return now if debouncing failed or nothing is connected or
3040 * the device was "removed".
3042 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
3043 test_bit(port1
, hub
->removed_bits
)) {
3045 /* maybe switch power back on (e.g. root hub was reset) */
3046 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
3047 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
3048 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
3050 if (portstatus
& USB_PORT_STAT_ENABLE
)
3055 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
3057 /* reallocate for each attempt, since references
3058 * to the previous one can escape in various ways
3060 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
3063 "couldn't allocate port %d usb_device\n",
3068 usb_set_device_state(udev
, USB_STATE_POWERED
);
3069 udev
->bus_mA
= hub
->mA_per_port
;
3070 udev
->level
= hdev
->level
+ 1;
3071 udev
->wusb
= hub_is_wusb(hub
);
3074 * USB 3.0 devices are reset automatically before the connect
3075 * port status change appears, and the root hub port status
3076 * shows the correct speed. We also get port change
3077 * notifications for USB 3.0 devices from the USB 3.0 portion of
3078 * an external USB 3.0 hub, but this isn't handled correctly yet
3082 if (!(hcd
->driver
->flags
& HCD_USB3
))
3083 udev
->speed
= USB_SPEED_UNKNOWN
;
3084 else if ((hdev
->parent
== NULL
) &&
3085 (portstatus
& (1 << USB_PORT_FEAT_SUPERSPEED
)))
3086 udev
->speed
= USB_SPEED_SUPER
;
3088 udev
->speed
= USB_SPEED_UNKNOWN
;
3091 * xHCI needs to issue an address device command later
3092 * in the hub_port_init sequence for SS/HS/FS/LS devices.
3094 if (!(hcd
->driver
->flags
& HCD_USB3
)) {
3095 /* set the address */
3096 choose_address(udev
);
3097 if (udev
->devnum
<= 0) {
3098 status
= -ENOTCONN
; /* Don't retry */
3103 /* reset (non-USB 3.0 devices) and get descriptor */
3104 status
= hub_port_init(hub
, udev
, port1
, i
);
3108 /* consecutive bus-powered hubs aren't reliable; they can
3109 * violate the voltage drop budget. if the new child has
3110 * a "powered" LED, users should notice we didn't enable it
3111 * (without reading syslog), even without per-port LEDs
3114 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
3115 && udev
->bus_mA
<= 100) {
3118 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
3121 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
3124 le16_to_cpus(&devstat
);
3125 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
3127 "can't connect bus-powered hub "
3129 if (hub
->has_indicators
) {
3130 hub
->indicator
[port1
-1] =
3131 INDICATOR_AMBER_BLINK
;
3132 schedule_delayed_work (&hub
->leds
, 0);
3134 status
= -ENOTCONN
; /* Don't retry */
3139 /* check for devices running slower than they could */
3140 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
3141 && udev
->speed
== USB_SPEED_FULL
3142 && highspeed_hubs
!= 0)
3143 check_highspeed (hub
, udev
, port1
);
3145 /* Store the parent's children[] pointer. At this point
3146 * udev becomes globally accessible, although presumably
3147 * no one will look at it until hdev is unlocked.
3151 /* We mustn't add new devices if the parent hub has
3152 * been disconnected; we would race with the
3153 * recursively_mark_NOTATTACHED() routine.
3155 spin_lock_irq(&device_state_lock
);
3156 if (hdev
->state
== USB_STATE_NOTATTACHED
)
3159 hdev
->children
[port1
-1] = udev
;
3160 spin_unlock_irq(&device_state_lock
);
3162 /* Run it through the hoops (find a driver, etc) */
3164 status
= usb_new_device(udev
);
3166 spin_lock_irq(&device_state_lock
);
3167 hdev
->children
[port1
-1] = NULL
;
3168 spin_unlock_irq(&device_state_lock
);
3175 status
= hub_power_remaining(hub
);
3177 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
3182 hub_port_disable(hub
, port1
, 1);
3184 usb_ep0_reinit(udev
);
3185 release_address(udev
);
3187 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
3190 if (hub
->hdev
->parent
||
3191 !hcd
->driver
->port_handed_over
||
3192 !(hcd
->driver
->port_handed_over
)(hcd
, port1
))
3193 dev_err(hub_dev
, "unable to enumerate USB device on port %d\n",
3197 hub_port_disable(hub
, port1
, 1);
3198 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
3199 hcd
->driver
->relinquish_port(hcd
, port1
);
3202 static void hub_events(void)
3204 struct list_head
*tmp
;
3205 struct usb_device
*hdev
;
3206 struct usb_interface
*intf
;
3207 struct usb_hub
*hub
;
3208 struct device
*hub_dev
;
3217 * We restart the list every time to avoid a deadlock with
3218 * deleting hubs downstream from this one. This should be
3219 * safe since we delete the hub from the event list.
3220 * Not the most efficient, but avoids deadlocks.
3224 /* Grab the first entry at the beginning of the list */
3225 spin_lock_irq(&hub_event_lock
);
3226 if (list_empty(&hub_event_list
)) {
3227 spin_unlock_irq(&hub_event_lock
);
3231 tmp
= hub_event_list
.next
;
3234 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
3235 kref_get(&hub
->kref
);
3236 spin_unlock_irq(&hub_event_lock
);
3239 hub_dev
= hub
->intfdev
;
3240 intf
= to_usb_interface(hub_dev
);
3241 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
3242 hdev
->state
, hub
->descriptor
3243 ? hub
->descriptor
->bNbrPorts
3245 /* NOTE: expects max 15 ports... */
3246 (u16
) hub
->change_bits
[0],
3247 (u16
) hub
->event_bits
[0]);
3249 /* Lock the device, then check to see if we were
3250 * disconnected while waiting for the lock to succeed. */
3251 usb_lock_device(hdev
);
3252 if (unlikely(hub
->disconnected
))
3255 /* If the hub has died, clean up after it */
3256 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
3257 hub
->error
= -ENODEV
;
3258 hub_quiesce(hub
, HUB_DISCONNECT
);
3263 ret
= usb_autopm_get_interface(intf
);
3265 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
3269 /* If this is an inactive hub, do nothing */
3274 dev_dbg (hub_dev
, "resetting for error %d\n",
3277 ret
= usb_reset_device(hdev
);
3280 "error resetting hub: %d\n", ret
);
3288 /* deal with port status changes */
3289 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
3290 if (test_bit(i
, hub
->busy_bits
))
3292 connect_change
= test_bit(i
, hub
->change_bits
);
3293 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
3297 ret
= hub_port_status(hub
, i
,
3298 &portstatus
, &portchange
);
3302 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
3303 clear_port_feature(hdev
, i
,
3304 USB_PORT_FEAT_C_CONNECTION
);
3308 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
3309 if (!connect_change
)
3311 "port %d enable change, "
3314 clear_port_feature(hdev
, i
,
3315 USB_PORT_FEAT_C_ENABLE
);
3318 * EM interference sometimes causes badly
3319 * shielded USB devices to be shutdown by
3320 * the hub, this hack enables them again.
3321 * Works at least with mouse driver.
3323 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
3325 && hdev
->children
[i
-1]) {
3328 "disabled by hub (EMI?), "
3335 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
3336 struct usb_device
*udev
;
3338 clear_port_feature(hdev
, i
,
3339 USB_PORT_FEAT_C_SUSPEND
);
3340 udev
= hdev
->children
[i
-1];
3342 usb_lock_device(udev
);
3343 ret
= remote_wakeup(hdev
->
3345 usb_unlock_device(udev
);
3350 hub_port_disable(hub
, i
, 1);
3353 "resume on port %d, status %d\n",
3357 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
3359 "over-current change on port %d\n",
3361 clear_port_feature(hdev
, i
,
3362 USB_PORT_FEAT_C_OVER_CURRENT
);
3363 hub_power_on(hub
, true);
3366 if (portchange
& USB_PORT_STAT_C_RESET
) {
3368 "reset change on port %d\n",
3370 clear_port_feature(hdev
, i
,
3371 USB_PORT_FEAT_C_RESET
);
3375 hub_port_connect_change(hub
, i
,
3376 portstatus
, portchange
);
3379 /* deal with hub status changes */
3380 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
3382 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
3383 dev_err (hub_dev
, "get_hub_status failed\n");
3385 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
3386 dev_dbg (hub_dev
, "power change\n");
3387 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
3388 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
3389 /* FIXME: Is this always true? */
3390 hub
->limited_power
= 1;
3392 hub
->limited_power
= 0;
3394 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
3395 dev_dbg (hub_dev
, "overcurrent change\n");
3396 msleep(500); /* Cool down */
3397 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
3398 hub_power_on(hub
, true);
3403 /* Balance the usb_autopm_get_interface() above */
3404 usb_autopm_put_interface_no_suspend(intf
);
3406 /* Balance the usb_autopm_get_interface_no_resume() in
3407 * kick_khubd() and allow autosuspend.
3409 usb_autopm_put_interface(intf
);
3411 usb_unlock_device(hdev
);
3412 kref_put(&hub
->kref
, hub_release
);
3414 } /* end while (1) */
3417 static int hub_thread(void *__unused
)
3419 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3420 * port handover. Otherwise it might see that a full-speed device
3421 * was gone before the EHCI controller had handed its port over to
3422 * the companion full-speed controller.
3428 wait_event_freezable(khubd_wait
,
3429 !list_empty(&hub_event_list
) ||
3430 kthread_should_stop());
3431 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
3433 pr_debug("%s: khubd exiting\n", usbcore_name
);
3437 static struct usb_device_id hub_id_table
[] = {
3438 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
3439 .bDeviceClass
= USB_CLASS_HUB
},
3440 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
3441 .bInterfaceClass
= USB_CLASS_HUB
},
3442 { } /* Terminating entry */
3445 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
3447 static struct usb_driver hub_driver
= {
3450 .disconnect
= hub_disconnect
,
3451 .suspend
= hub_suspend
,
3452 .resume
= hub_resume
,
3453 .reset_resume
= hub_reset_resume
,
3454 .pre_reset
= hub_pre_reset
,
3455 .post_reset
= hub_post_reset
,
3457 .id_table
= hub_id_table
,
3458 .supports_autosuspend
= 1,
3461 int usb_hub_init(void)
3463 if (usb_register(&hub_driver
) < 0) {
3464 printk(KERN_ERR
"%s: can't register hub driver\n",
3469 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
3470 if (!IS_ERR(khubd_task
))
3473 /* Fall through if kernel_thread failed */
3474 usb_deregister(&hub_driver
);
3475 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
3480 void usb_hub_cleanup(void)
3482 kthread_stop(khubd_task
);
3485 * Hub resources are freed for us by usb_deregister. It calls
3486 * usb_driver_purge on every device which in turn calls that
3487 * devices disconnect function if it is using this driver.
3488 * The hub_disconnect function takes care of releasing the
3489 * individual hub resources. -greg
3491 usb_deregister(&hub_driver
);
3492 } /* usb_hub_cleanup() */
3494 static int descriptors_changed(struct usb_device
*udev
,
3495 struct usb_device_descriptor
*old_device_descriptor
)
3499 unsigned serial_len
= 0;
3501 unsigned old_length
;
3505 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
3506 sizeof(*old_device_descriptor
)) != 0)
3509 /* Since the idVendor, idProduct, and bcdDevice values in the
3510 * device descriptor haven't changed, we will assume the
3511 * Manufacturer and Product strings haven't changed either.
3512 * But the SerialNumber string could be different (e.g., a
3513 * different flash card of the same brand).
3516 serial_len
= strlen(udev
->serial
) + 1;
3519 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3520 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3521 len
= max(len
, old_length
);
3524 buf
= kmalloc(len
, GFP_NOIO
);
3526 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
3527 /* assume the worst */
3530 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3531 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3532 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
3534 if (length
!= old_length
) {
3535 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
3540 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
3542 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
3544 ((struct usb_config_descriptor
*) buf
)->
3545 bConfigurationValue
);
3551 if (!changed
&& serial_len
) {
3552 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
3554 if (length
+ 1 != serial_len
) {
3555 dev_dbg(&udev
->dev
, "serial string error %d\n",
3558 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
3559 dev_dbg(&udev
->dev
, "serial string changed\n");
3569 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
3570 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3572 * WARNING - don't use this routine to reset a composite device
3573 * (one with multiple interfaces owned by separate drivers)!
3574 * Use usb_reset_device() instead.
3576 * Do a port reset, reassign the device's address, and establish its
3577 * former operating configuration. If the reset fails, or the device's
3578 * descriptors change from their values before the reset, or the original
3579 * configuration and altsettings cannot be restored, a flag will be set
3580 * telling khubd to pretend the device has been disconnected and then
3581 * re-connected. All drivers will be unbound, and the device will be
3582 * re-enumerated and probed all over again.
3584 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3585 * flagged for logical disconnection, or some other negative error code
3586 * if the reset wasn't even attempted.
3588 * The caller must own the device lock. For example, it's safe to use
3589 * this from a driver probe() routine after downloading new firmware.
3590 * For calls that might not occur during probe(), drivers should lock
3591 * the device using usb_lock_device_for_reset().
3593 * Locking exception: This routine may also be called from within an
3594 * autoresume handler. Such usage won't conflict with other tasks
3595 * holding the device lock because these tasks should always call
3596 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3598 static int usb_reset_and_verify_device(struct usb_device
*udev
)
3600 struct usb_device
*parent_hdev
= udev
->parent
;
3601 struct usb_hub
*parent_hub
;
3602 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3603 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3605 int port1
= udev
->portnum
;
3607 if (udev
->state
== USB_STATE_NOTATTACHED
||
3608 udev
->state
== USB_STATE_SUSPENDED
) {
3609 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3615 /* this requires hcd-specific logic; see OHCI hc_restart() */
3616 dev_dbg(&udev
->dev
, "%s for root hub!\n", __func__
);
3619 parent_hub
= hdev_to_hub(parent_hdev
);
3621 set_bit(port1
, parent_hub
->busy_bits
);
3622 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3624 /* ep0 maxpacket size may change; let the HCD know about it.
3625 * Other endpoints will be handled by re-enumeration. */
3626 usb_ep0_reinit(udev
);
3627 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3628 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
3631 clear_bit(port1
, parent_hub
->busy_bits
);
3636 /* Device might have changed firmware (DFU or similar) */
3637 if (descriptors_changed(udev
, &descriptor
)) {
3638 dev_info(&udev
->dev
, "device firmware changed\n");
3639 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3643 /* Restore the device's previous configuration */
3644 if (!udev
->actconfig
)
3647 mutex_lock(&hcd
->bandwidth_mutex
);
3648 ret
= usb_hcd_alloc_bandwidth(udev
, udev
->actconfig
, NULL
, NULL
);
3650 dev_warn(&udev
->dev
,
3651 "Busted HC? Not enough HCD resources for "
3652 "old configuration.\n");
3653 mutex_unlock(&hcd
->bandwidth_mutex
);
3656 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3657 USB_REQ_SET_CONFIGURATION
, 0,
3658 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3659 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3662 "can't restore configuration #%d (error=%d)\n",
3663 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3664 mutex_unlock(&hcd
->bandwidth_mutex
);
3667 mutex_unlock(&hcd
->bandwidth_mutex
);
3668 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3670 /* Put interfaces back into the same altsettings as before.
3671 * Don't bother to send the Set-Interface request for interfaces
3672 * that were already in altsetting 0; besides being unnecessary,
3673 * many devices can't handle it. Instead just reset the host-side
3676 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3677 struct usb_host_config
*config
= udev
->actconfig
;
3678 struct usb_interface
*intf
= config
->interface
[i
];
3679 struct usb_interface_descriptor
*desc
;
3681 desc
= &intf
->cur_altsetting
->desc
;
3682 if (desc
->bAlternateSetting
== 0) {
3683 usb_disable_interface(udev
, intf
, true);
3684 usb_enable_interface(udev
, intf
, true);
3687 /* We've just reset the device, so it will think alt
3688 * setting 0 is installed. For usb_set_interface() to
3689 * work properly, we need to set the current alternate
3690 * interface setting to 0 (or the first alt setting, if
3691 * the device doesn't have alt setting 0).
3693 intf
->cur_altsetting
=
3694 usb_find_alt_setting(config
, i
, 0);
3695 if (!intf
->cur_altsetting
)
3696 intf
->cur_altsetting
=
3697 &config
->intf_cache
[i
]->altsetting
[0];
3698 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3699 desc
->bAlternateSetting
);
3702 dev_err(&udev
->dev
, "failed to restore interface %d "
3703 "altsetting %d (error=%d)\n",
3704 desc
->bInterfaceNumber
,
3705 desc
->bAlternateSetting
,
3715 hub_port_logical_disconnect(parent_hub
, port1
);
3720 * usb_reset_device - warn interface drivers and perform a USB port reset
3721 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3723 * Warns all drivers bound to registered interfaces (using their pre_reset
3724 * method), performs the port reset, and then lets the drivers know that
3725 * the reset is over (using their post_reset method).
3727 * Return value is the same as for usb_reset_and_verify_device().
3729 * The caller must own the device lock. For example, it's safe to use
3730 * this from a driver probe() routine after downloading new firmware.
3731 * For calls that might not occur during probe(), drivers should lock
3732 * the device using usb_lock_device_for_reset().
3734 * If an interface is currently being probed or disconnected, we assume
3735 * its driver knows how to handle resets. For all other interfaces,
3736 * if the driver doesn't have pre_reset and post_reset methods then
3737 * we attempt to unbind it and rebind afterward.
3739 int usb_reset_device(struct usb_device
*udev
)
3743 struct usb_host_config
*config
= udev
->actconfig
;
3745 if (udev
->state
== USB_STATE_NOTATTACHED
||
3746 udev
->state
== USB_STATE_SUSPENDED
) {
3747 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3752 /* Prevent autosuspend during the reset */
3753 usb_autoresume_device(udev
);
3756 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3757 struct usb_interface
*cintf
= config
->interface
[i
];
3758 struct usb_driver
*drv
;
3761 if (cintf
->dev
.driver
) {
3762 drv
= to_usb_driver(cintf
->dev
.driver
);
3763 if (drv
->pre_reset
&& drv
->post_reset
)
3764 unbind
= (drv
->pre_reset
)(cintf
);
3765 else if (cintf
->condition
==
3766 USB_INTERFACE_BOUND
)
3769 usb_forced_unbind_intf(cintf
);
3774 ret
= usb_reset_and_verify_device(udev
);
3777 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3778 struct usb_interface
*cintf
= config
->interface
[i
];
3779 struct usb_driver
*drv
;
3780 int rebind
= cintf
->needs_binding
;
3782 if (!rebind
&& cintf
->dev
.driver
) {
3783 drv
= to_usb_driver(cintf
->dev
.driver
);
3784 if (drv
->post_reset
)
3785 rebind
= (drv
->post_reset
)(cintf
);
3786 else if (cintf
->condition
==
3787 USB_INTERFACE_BOUND
)
3790 if (ret
== 0 && rebind
)
3791 usb_rebind_intf(cintf
);
3795 usb_autosuspend_device(udev
);
3798 EXPORT_SYMBOL_GPL(usb_reset_device
);
3802 * usb_queue_reset_device - Reset a USB device from an atomic context
3803 * @iface: USB interface belonging to the device to reset
3805 * This function can be used to reset a USB device from an atomic
3806 * context, where usb_reset_device() won't work (as it blocks).
3808 * Doing a reset via this method is functionally equivalent to calling
3809 * usb_reset_device(), except for the fact that it is delayed to a
3810 * workqueue. This means that any drivers bound to other interfaces
3811 * might be unbound, as well as users from usbfs in user space.
3815 * - Scheduling two resets at the same time from two different drivers
3816 * attached to two different interfaces of the same device is
3817 * possible; depending on how the driver attached to each interface
3818 * handles ->pre_reset(), the second reset might happen or not.
3820 * - If a driver is unbound and it had a pending reset, the reset will
3823 * - This function can be called during .probe() or .disconnect()
3824 * times. On return from .disconnect(), any pending resets will be
3827 * There is no no need to lock/unlock the @reset_ws as schedule_work()
3830 * NOTE: We don't do any reference count tracking because it is not
3831 * needed. The lifecycle of the work_struct is tied to the
3832 * usb_interface. Before destroying the interface we cancel the
3833 * work_struct, so the fact that work_struct is queued and or
3834 * running means the interface (and thus, the device) exist and
3837 void usb_queue_reset_device(struct usb_interface
*iface
)
3839 schedule_work(&iface
->reset_ws
);
3841 EXPORT_SYMBOL_GPL(usb_queue_reset_device
);