4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/usb/hcd.h>
23 #include <linux/usb/quirks.h>
24 #include <linux/kthread.h>
25 #include <linux/mutex.h>
26 #include <linux/freezer.h>
28 #include <asm/uaccess.h>
29 #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 */
74 unsigned limited_power
:1;
76 unsigned disconnected
:1;
78 unsigned has_indicators
:1;
79 u8 indicator
[USB_MAXCHILDREN
];
80 struct delayed_work leds
;
81 struct delayed_work init_work
;
86 /* Protect struct usb_device->state and ->children members
87 * Note: Both are also protected by ->dev.sem, except that ->state can
88 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
89 static DEFINE_SPINLOCK(device_state_lock
);
91 /* khubd's worklist and its lock */
92 static DEFINE_SPINLOCK(hub_event_lock
);
93 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
96 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
98 static struct task_struct
*khubd_task
;
100 /* cycle leds on hubs that aren't blinking for attention */
101 static int blinkenlights
= 0;
102 module_param (blinkenlights
, bool, S_IRUGO
);
103 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
106 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
107 * 10 seconds to send reply for the initial 64-byte descriptor request.
109 /* define initial 64-byte descriptor request timeout in milliseconds */
110 static int initial_descriptor_timeout
= USB_CTRL_GET_TIMEOUT
;
111 module_param(initial_descriptor_timeout
, int, S_IRUGO
|S_IWUSR
);
112 MODULE_PARM_DESC(initial_descriptor_timeout
,
113 "initial 64-byte descriptor request timeout in milliseconds "
114 "(default 5000 - 5.0 seconds)");
117 * As of 2.6.10 we introduce a new USB device initialization scheme which
118 * closely resembles the way Windows works. Hopefully it will be compatible
119 * with a wider range of devices than the old scheme. However some previously
120 * working devices may start giving rise to "device not accepting address"
121 * errors; if that happens the user can try the old scheme by adjusting the
122 * following module parameters.
124 * For maximum flexibility there are two boolean parameters to control the
125 * hub driver's behavior. On the first initialization attempt, if the
126 * "old_scheme_first" parameter is set then the old scheme will be used,
127 * otherwise the new scheme is used. If that fails and "use_both_schemes"
128 * is set, then the driver will make another attempt, using the other scheme.
130 static int old_scheme_first
= 0;
131 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
132 MODULE_PARM_DESC(old_scheme_first
,
133 "start with the old device initialization scheme");
135 static int use_both_schemes
= 1;
136 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
137 MODULE_PARM_DESC(use_both_schemes
,
138 "try the other device initialization scheme if the "
141 /* Mutual exclusion for EHCI CF initialization. This interferes with
142 * port reset on some companion controllers.
144 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
145 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
147 #define HUB_DEBOUNCE_TIMEOUT 1500
148 #define HUB_DEBOUNCE_STEP 25
149 #define HUB_DEBOUNCE_STABLE 100
152 static int usb_reset_and_verify_device(struct usb_device
*udev
);
154 static inline char *portspeed(int portstatus
)
156 if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
158 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
160 else if (portstatus
& USB_PORT_STAT_SUPER_SPEED
)
166 /* Note that hdev or one of its children must be locked! */
167 static struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
169 if (!hdev
|| !hdev
->actconfig
)
171 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
174 /* USB 2.0 spec Section 11.24.4.5 */
175 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
179 for (i
= 0; i
< 3; i
++) {
180 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
181 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
182 USB_DT_HUB
<< 8, 0, data
, size
,
183 USB_CTRL_GET_TIMEOUT
);
184 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
191 * USB 2.0 spec Section 11.24.2.1
193 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
195 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
196 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
200 * USB 2.0 spec Section 11.24.2.2
202 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
204 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
205 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
210 * USB 2.0 spec Section 11.24.2.13
212 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
214 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
215 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
220 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
221 * for info about using port indicators
223 static void set_port_led(
229 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
230 USB_PORT_FEAT_INDICATOR
);
232 dev_dbg (hub
->intfdev
,
233 "port %d indicator %s status %d\n",
235 ({ char *s
; switch (selector
) {
236 case HUB_LED_AMBER
: s
= "amber"; break;
237 case HUB_LED_GREEN
: s
= "green"; break;
238 case HUB_LED_OFF
: s
= "off"; break;
239 case HUB_LED_AUTO
: s
= "auto"; break;
240 default: s
= "??"; break;
245 #define LED_CYCLE_PERIOD ((2*HZ)/3)
247 static void led_work (struct work_struct
*work
)
249 struct usb_hub
*hub
=
250 container_of(work
, struct usb_hub
, leds
.work
);
251 struct usb_device
*hdev
= hub
->hdev
;
253 unsigned changed
= 0;
256 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
259 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
260 unsigned selector
, mode
;
262 /* 30%-50% duty cycle */
264 switch (hub
->indicator
[i
]) {
266 case INDICATOR_CYCLE
:
268 selector
= HUB_LED_AUTO
;
269 mode
= INDICATOR_AUTO
;
271 /* blinking green = sw attention */
272 case INDICATOR_GREEN_BLINK
:
273 selector
= HUB_LED_GREEN
;
274 mode
= INDICATOR_GREEN_BLINK_OFF
;
276 case INDICATOR_GREEN_BLINK_OFF
:
277 selector
= HUB_LED_OFF
;
278 mode
= INDICATOR_GREEN_BLINK
;
280 /* blinking amber = hw attention */
281 case INDICATOR_AMBER_BLINK
:
282 selector
= HUB_LED_AMBER
;
283 mode
= INDICATOR_AMBER_BLINK_OFF
;
285 case INDICATOR_AMBER_BLINK_OFF
:
286 selector
= HUB_LED_OFF
;
287 mode
= INDICATOR_AMBER_BLINK
;
289 /* blink green/amber = reserved */
290 case INDICATOR_ALT_BLINK
:
291 selector
= HUB_LED_GREEN
;
292 mode
= INDICATOR_ALT_BLINK_OFF
;
294 case INDICATOR_ALT_BLINK_OFF
:
295 selector
= HUB_LED_AMBER
;
296 mode
= INDICATOR_ALT_BLINK
;
301 if (selector
!= HUB_LED_AUTO
)
303 set_port_led(hub
, i
+ 1, selector
);
304 hub
->indicator
[i
] = mode
;
306 if (!changed
&& blinkenlights
) {
308 cursor
%= hub
->descriptor
->bNbrPorts
;
309 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
310 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
314 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
317 /* use a short timeout for hub/port status fetches */
318 #define USB_STS_TIMEOUT 1000
319 #define USB_STS_RETRIES 5
322 * USB 2.0 spec Section 11.24.2.6
324 static int get_hub_status(struct usb_device
*hdev
,
325 struct usb_hub_status
*data
)
327 int i
, status
= -ETIMEDOUT
;
329 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
330 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
331 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
332 data
, sizeof(*data
), USB_STS_TIMEOUT
);
338 * USB 2.0 spec Section 11.24.2.7
340 static int get_port_status(struct usb_device
*hdev
, int port1
,
341 struct usb_port_status
*data
)
343 int i
, status
= -ETIMEDOUT
;
345 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
346 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
347 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
348 data
, sizeof(*data
), USB_STS_TIMEOUT
);
353 static int hub_port_status(struct usb_hub
*hub
, int port1
,
354 u16
*status
, u16
*change
)
358 mutex_lock(&hub
->status_mutex
);
359 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
361 dev_err(hub
->intfdev
,
362 "%s failed (err = %d)\n", __func__
, ret
);
366 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
367 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
370 mutex_unlock(&hub
->status_mutex
);
374 static void kick_khubd(struct usb_hub
*hub
)
378 spin_lock_irqsave(&hub_event_lock
, flags
);
379 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
380 list_add_tail(&hub
->event_list
, &hub_event_list
);
382 /* Suppress autosuspend until khubd runs */
383 usb_autopm_get_interface_no_resume(
384 to_usb_interface(hub
->intfdev
));
385 wake_up(&khubd_wait
);
387 spin_unlock_irqrestore(&hub_event_lock
, flags
);
390 void usb_kick_khubd(struct usb_device
*hdev
)
392 struct usb_hub
*hub
= hdev_to_hub(hdev
);
399 /* completion function, fires on port status changes and various faults */
400 static void hub_irq(struct urb
*urb
)
402 struct usb_hub
*hub
= urb
->context
;
403 int status
= urb
->status
;
408 case -ENOENT
: /* synchronous unlink */
409 case -ECONNRESET
: /* async unlink */
410 case -ESHUTDOWN
: /* hardware going away */
413 default: /* presumably an error */
414 /* Cause a hub reset after 10 consecutive errors */
415 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
416 if ((++hub
->nerrors
< 10) || hub
->error
)
421 /* let khubd handle things */
422 case 0: /* we got data: port status changed */
424 for (i
= 0; i
< urb
->actual_length
; ++i
)
425 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
427 hub
->event_bits
[0] = bits
;
433 /* Something happened, let khubd figure it out */
440 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
441 && status
!= -ENODEV
&& status
!= -EPERM
)
442 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
445 /* USB 2.0 spec Section 11.24.2.3 */
447 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
449 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
450 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
455 * enumeration blocks khubd for a long time. we use keventd instead, since
456 * long blocking there is the exception, not the rule. accordingly, HCDs
457 * talking to TTs must queue control transfers (not just bulk and iso), so
458 * both can talk to the same hub concurrently.
460 static void hub_tt_work(struct work_struct
*work
)
462 struct usb_hub
*hub
=
463 container_of(work
, struct usb_hub
, tt
.clear_work
);
467 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
468 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
469 struct list_head
*next
;
470 struct usb_tt_clear
*clear
;
471 struct usb_device
*hdev
= hub
->hdev
;
472 const struct hc_driver
*drv
;
475 next
= hub
->tt
.clear_list
.next
;
476 clear
= list_entry (next
, struct usb_tt_clear
, clear_list
);
477 list_del (&clear
->clear_list
);
479 /* drop lock so HCD can concurrently report other TT errors */
480 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
481 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
484 "clear tt %d (%04x) error %d\n",
485 clear
->tt
, clear
->devinfo
, status
);
487 /* Tell the HCD, even if the operation failed */
488 drv
= clear
->hcd
->driver
;
489 if (drv
->clear_tt_buffer_complete
)
490 (drv
->clear_tt_buffer_complete
)(clear
->hcd
, clear
->ep
);
493 spin_lock_irqsave(&hub
->tt
.lock
, flags
);
495 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
499 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
500 * @urb: an URB associated with the failed or incomplete split transaction
502 * High speed HCDs use this to tell the hub driver that some split control or
503 * bulk transaction failed in a way that requires clearing internal state of
504 * a transaction translator. This is normally detected (and reported) from
507 * It may not be possible for that hub to handle additional full (or low)
508 * speed transactions until that state is fully cleared out.
510 int usb_hub_clear_tt_buffer(struct urb
*urb
)
512 struct usb_device
*udev
= urb
->dev
;
513 int pipe
= urb
->pipe
;
514 struct usb_tt
*tt
= udev
->tt
;
516 struct usb_tt_clear
*clear
;
518 /* we've got to cope with an arbitrary number of pending TT clears,
519 * since each TT has "at least two" buffers that can need it (and
520 * there can be many TTs per hub). even if they're uncommon.
522 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
523 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
524 /* FIXME recover somehow ... RESET_TT? */
528 /* info that CLEAR_TT_BUFFER needs */
529 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
530 clear
->devinfo
= usb_pipeendpoint (pipe
);
531 clear
->devinfo
|= udev
->devnum
<< 4;
532 clear
->devinfo
|= usb_pipecontrol (pipe
)
533 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
534 : (USB_ENDPOINT_XFER_BULK
<< 11);
535 if (usb_pipein (pipe
))
536 clear
->devinfo
|= 1 << 15;
538 /* info for completion callback */
539 clear
->hcd
= bus_to_hcd(udev
->bus
);
542 /* tell keventd to clear state for this TT */
543 spin_lock_irqsave (&tt
->lock
, flags
);
544 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
545 schedule_work(&tt
->clear_work
);
546 spin_unlock_irqrestore (&tt
->lock
, flags
);
549 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer
);
551 /* If do_delay is false, return the number of milliseconds the caller
554 static unsigned hub_power_on(struct usb_hub
*hub
, bool do_delay
)
557 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
559 u16 wHubCharacteristics
=
560 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
562 /* Enable power on each port. Some hubs have reserved values
563 * of LPSM (> 2) in their descriptors, even though they are
564 * USB 2.0 hubs. Some hubs do not implement port-power switching
565 * but only emulate it. In all cases, the ports won't work
566 * unless we send these messages to the hub.
568 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
569 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
571 dev_dbg(hub
->intfdev
, "trying to enable port power on "
572 "non-switchable hub\n");
573 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
574 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
576 /* Wait at least 100 msec for power to become stable */
577 delay
= max(pgood_delay
, (unsigned) 100);
583 static int hub_hub_status(struct usb_hub
*hub
,
584 u16
*status
, u16
*change
)
588 mutex_lock(&hub
->status_mutex
);
589 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
591 dev_err (hub
->intfdev
,
592 "%s failed (err = %d)\n", __func__
, ret
);
594 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
595 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
598 mutex_unlock(&hub
->status_mutex
);
602 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
604 struct usb_device
*hdev
= hub
->hdev
;
607 if (hdev
->children
[port1
-1] && set_state
)
608 usb_set_device_state(hdev
->children
[port1
-1],
609 USB_STATE_NOTATTACHED
);
611 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
613 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
619 * Disable a port and mark a logical connnect-change event, so that some
620 * time later khubd will disconnect() any existing usb_device on the port
621 * and will re-enumerate if there actually is a device attached.
623 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
625 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
626 hub_port_disable(hub
, port1
, 1);
628 /* FIXME let caller ask to power down the port:
629 * - some devices won't enumerate without a VBUS power cycle
630 * - SRP saves power that way
631 * - ... new call, TBD ...
632 * That's easy if this hub can switch power per-port, and
633 * khubd reactivates the port later (timer, SRP, etc).
634 * Powerdown must be optional, because of reset/DFU.
637 set_bit(port1
, hub
->change_bits
);
642 * usb_remove_device - disable a device's port on its parent hub
643 * @udev: device to be disabled and removed
644 * Context: @udev locked, must be able to sleep.
646 * After @udev's port has been disabled, khubd is notified and it will
647 * see that the device has been disconnected. When the device is
648 * physically unplugged and something is plugged in, the events will
649 * be received and processed normally.
651 int usb_remove_device(struct usb_device
*udev
)
654 struct usb_interface
*intf
;
656 if (!udev
->parent
) /* Can't remove a root hub */
658 hub
= hdev_to_hub(udev
->parent
);
659 intf
= to_usb_interface(hub
->intfdev
);
661 usb_autopm_get_interface(intf
);
662 set_bit(udev
->portnum
, hub
->removed_bits
);
663 hub_port_logical_disconnect(hub
, udev
->portnum
);
664 usb_autopm_put_interface(intf
);
668 enum hub_activation_type
{
669 HUB_INIT
, HUB_INIT2
, HUB_INIT3
, /* INITs must come first */
670 HUB_POST_RESET
, HUB_RESUME
, HUB_RESET_RESUME
,
673 static void hub_init_func2(struct work_struct
*ws
);
674 static void hub_init_func3(struct work_struct
*ws
);
676 static void hub_activate(struct usb_hub
*hub
, enum hub_activation_type type
)
678 struct usb_device
*hdev
= hub
->hdev
;
681 bool need_debounce_delay
= false;
684 /* Continue a partial initialization */
685 if (type
== HUB_INIT2
)
687 if (type
== HUB_INIT3
)
690 /* After a resume, port power should still be on.
691 * For any other type of activation, turn it on.
693 if (type
!= HUB_RESUME
) {
695 /* Speed up system boot by using a delayed_work for the
696 * hub's initial power-up delays. This is pretty awkward
697 * and the implementation looks like a home-brewed sort of
698 * setjmp/longjmp, but it saves at least 100 ms for each
699 * root hub (assuming usbcore is compiled into the kernel
700 * rather than as a module). It adds up.
702 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
703 * because for those activation types the ports have to be
704 * operational when we return. In theory this could be done
705 * for HUB_POST_RESET, but it's easier not to.
707 if (type
== HUB_INIT
) {
708 delay
= hub_power_on(hub
, false);
709 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func2
);
710 schedule_delayed_work(&hub
->init_work
,
711 msecs_to_jiffies(delay
));
713 /* Suppress autosuspend until init is done */
714 usb_autopm_get_interface_no_resume(
715 to_usb_interface(hub
->intfdev
));
716 return; /* Continues at init2: below */
718 hub_power_on(hub
, true);
723 /* Check each port and set hub->change_bits to let khubd know
724 * which ports need attention.
726 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
727 struct usb_device
*udev
= hdev
->children
[port1
-1];
728 u16 portstatus
, portchange
;
730 portstatus
= portchange
= 0;
731 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
732 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
733 dev_dbg(hub
->intfdev
,
734 "port %d: status %04x change %04x\n",
735 port1
, portstatus
, portchange
);
737 /* After anything other than HUB_RESUME (i.e., initialization
738 * or any sort of reset), every port should be disabled.
739 * Unconnected ports should likewise be disabled (paranoia),
740 * and so should ports for which we have no usb_device.
742 if ((portstatus
& USB_PORT_STAT_ENABLE
) && (
743 type
!= HUB_RESUME
||
744 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
746 udev
->state
== USB_STATE_NOTATTACHED
)) {
748 * USB3 protocol ports will automatically transition
749 * to Enabled state when detect an USB3.0 device attach.
750 * Do not disable USB3 protocol ports.
751 * FIXME: USB3 root hub and external hubs are treated
754 if (hdev
->descriptor
.bDeviceProtocol
!= 3 ||
756 !(portstatus
& USB_PORT_STAT_SUPER_SPEED
))) {
757 clear_port_feature(hdev
, port1
,
758 USB_PORT_FEAT_ENABLE
);
759 portstatus
&= ~USB_PORT_STAT_ENABLE
;
761 /* Pretend that power was lost for USB3 devs */
762 portstatus
&= ~USB_PORT_STAT_ENABLE
;
766 /* Clear status-change flags; we'll debounce later */
767 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
768 need_debounce_delay
= true;
769 clear_port_feature(hub
->hdev
, port1
,
770 USB_PORT_FEAT_C_CONNECTION
);
772 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
773 need_debounce_delay
= true;
774 clear_port_feature(hub
->hdev
, port1
,
775 USB_PORT_FEAT_C_ENABLE
);
778 /* We can forget about a "removed" device when there's a
779 * physical disconnect or the connect status changes.
781 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
782 (portchange
& USB_PORT_STAT_C_CONNECTION
))
783 clear_bit(port1
, hub
->removed_bits
);
785 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
786 /* Tell khubd to disconnect the device or
787 * check for a new connection
789 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
790 set_bit(port1
, hub
->change_bits
);
792 } else if (portstatus
& USB_PORT_STAT_ENABLE
) {
793 /* The power session apparently survived the resume.
794 * If there was an overcurrent or suspend change
795 * (i.e., remote wakeup request), have khubd
799 set_bit(port1
, hub
->change_bits
);
801 } else if (udev
->persist_enabled
) {
803 udev
->reset_resume
= 1;
805 set_bit(port1
, hub
->change_bits
);
808 /* The power session is gone; tell khubd */
809 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
810 set_bit(port1
, hub
->change_bits
);
814 /* If no port-status-change flags were set, we don't need any
815 * debouncing. If flags were set we can try to debounce the
816 * ports all at once right now, instead of letting khubd do them
817 * one at a time later on.
819 * If any port-status changes do occur during this delay, khubd
820 * will see them later and handle them normally.
822 if (need_debounce_delay
) {
823 delay
= HUB_DEBOUNCE_STABLE
;
825 /* Don't do a long sleep inside a workqueue routine */
826 if (type
== HUB_INIT2
) {
827 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func3
);
828 schedule_delayed_work(&hub
->init_work
,
829 msecs_to_jiffies(delay
));
830 return; /* Continues at init3: below */
838 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
840 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
841 if (hub
->has_indicators
&& blinkenlights
)
842 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
844 /* Scan all ports that need attention */
847 /* Allow autosuspend if it was suppressed */
848 if (type
<= HUB_INIT3
)
849 usb_autopm_put_interface_async(to_usb_interface(hub
->intfdev
));
852 /* Implement the continuations for the delays above */
853 static void hub_init_func2(struct work_struct
*ws
)
855 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
857 hub_activate(hub
, HUB_INIT2
);
860 static void hub_init_func3(struct work_struct
*ws
)
862 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
864 hub_activate(hub
, HUB_INIT3
);
867 enum hub_quiescing_type
{
868 HUB_DISCONNECT
, HUB_PRE_RESET
, HUB_SUSPEND
871 static void hub_quiesce(struct usb_hub
*hub
, enum hub_quiescing_type type
)
873 struct usb_device
*hdev
= hub
->hdev
;
876 cancel_delayed_work_sync(&hub
->init_work
);
878 /* khubd and related activity won't re-trigger */
881 if (type
!= HUB_SUSPEND
) {
882 /* Disconnect all the children */
883 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
884 if (hdev
->children
[i
])
885 usb_disconnect(&hdev
->children
[i
]);
889 /* Stop khubd and related activity */
890 usb_kill_urb(hub
->urb
);
891 if (hub
->has_indicators
)
892 cancel_delayed_work_sync(&hub
->leds
);
894 cancel_work_sync(&hub
->tt
.clear_work
);
897 /* caller has locked the hub device */
898 static int hub_pre_reset(struct usb_interface
*intf
)
900 struct usb_hub
*hub
= usb_get_intfdata(intf
);
902 hub_quiesce(hub
, HUB_PRE_RESET
);
906 /* caller has locked the hub device */
907 static int hub_post_reset(struct usb_interface
*intf
)
909 struct usb_hub
*hub
= usb_get_intfdata(intf
);
911 hub_activate(hub
, HUB_POST_RESET
);
915 static int hub_configure(struct usb_hub
*hub
,
916 struct usb_endpoint_descriptor
*endpoint
)
919 struct usb_device
*hdev
= hub
->hdev
;
920 struct device
*hub_dev
= hub
->intfdev
;
921 u16 hubstatus
, hubchange
;
922 u16 wHubCharacteristics
;
925 char *message
= "out of memory";
927 hub
->buffer
= kmalloc(sizeof(*hub
->buffer
), GFP_KERNEL
);
933 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
938 mutex_init(&hub
->status_mutex
);
940 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
941 if (!hub
->descriptor
) {
946 /* Request the entire hub descriptor.
947 * hub->descriptor can handle USB_MAXCHILDREN ports,
948 * but the hub can/will return fewer bytes here.
950 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
951 sizeof(*hub
->descriptor
));
953 message
= "can't read hub descriptor";
955 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
956 message
= "hub has too many ports!";
961 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
962 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
963 (hdev
->maxchild
== 1) ? "" : "s");
965 hub
->port_owners
= kzalloc(hdev
->maxchild
* sizeof(void *), GFP_KERNEL
);
966 if (!hub
->port_owners
) {
971 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
973 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
975 char portstr
[USB_MAXCHILDREN
+ 1];
977 for (i
= 0; i
< hdev
->maxchild
; i
++)
978 portstr
[i
] = hub
->descriptor
->DeviceRemovable
979 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
981 portstr
[hdev
->maxchild
] = 0;
982 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
984 dev_dbg(hub_dev
, "standalone hub\n");
986 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
988 dev_dbg(hub_dev
, "ganged power switching\n");
991 dev_dbg(hub_dev
, "individual port power switching\n");
995 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
999 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
1001 dev_dbg(hub_dev
, "global over-current protection\n");
1004 dev_dbg(hub_dev
, "individual port over-current protection\n");
1008 dev_dbg(hub_dev
, "no over-current protection\n");
1012 spin_lock_init (&hub
->tt
.lock
);
1013 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
1014 INIT_WORK(&hub
->tt
.clear_work
, hub_tt_work
);
1015 switch (hdev
->descriptor
.bDeviceProtocol
) {
1019 dev_dbg(hub_dev
, "Single TT\n");
1023 ret
= usb_set_interface(hdev
, 0, 1);
1025 dev_dbg(hub_dev
, "TT per port\n");
1028 dev_err(hub_dev
, "Using single TT (err %d)\n",
1033 /* USB 3.0 hubs don't have a TT */
1036 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
1037 hdev
->descriptor
.bDeviceProtocol
);
1041 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1042 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
1043 case HUB_TTTT_8_BITS
:
1044 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
1045 hub
->tt
.think_time
= 666;
1046 dev_dbg(hub_dev
, "TT requires at most %d "
1047 "FS bit times (%d ns)\n",
1048 8, hub
->tt
.think_time
);
1051 case HUB_TTTT_16_BITS
:
1052 hub
->tt
.think_time
= 666 * 2;
1053 dev_dbg(hub_dev
, "TT requires at most %d "
1054 "FS bit times (%d ns)\n",
1055 16, hub
->tt
.think_time
);
1057 case HUB_TTTT_24_BITS
:
1058 hub
->tt
.think_time
= 666 * 3;
1059 dev_dbg(hub_dev
, "TT requires at most %d "
1060 "FS bit times (%d ns)\n",
1061 24, hub
->tt
.think_time
);
1063 case HUB_TTTT_32_BITS
:
1064 hub
->tt
.think_time
= 666 * 4;
1065 dev_dbg(hub_dev
, "TT requires at most %d "
1066 "FS bit times (%d ns)\n",
1067 32, hub
->tt
.think_time
);
1071 /* probe() zeroes hub->indicator[] */
1072 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
1073 hub
->has_indicators
= 1;
1074 dev_dbg(hub_dev
, "Port indicators are supported\n");
1077 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
1078 hub
->descriptor
->bPwrOn2PwrGood
* 2);
1080 /* power budgeting mostly matters with bus-powered hubs,
1081 * and battery-powered root hubs (may provide just 8 mA).
1083 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
1085 message
= "can't get hub status";
1088 le16_to_cpus(&hubstatus
);
1089 if (hdev
== hdev
->bus
->root_hub
) {
1090 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
1091 hub
->mA_per_port
= 500;
1093 hub
->mA_per_port
= hdev
->bus_mA
;
1094 hub
->limited_power
= 1;
1096 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
1097 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
1098 hub
->descriptor
->bHubContrCurrent
);
1099 hub
->limited_power
= 1;
1100 if (hdev
->maxchild
> 0) {
1101 int remaining
= hdev
->bus_mA
-
1102 hub
->descriptor
->bHubContrCurrent
;
1104 if (remaining
< hdev
->maxchild
* 100)
1106 "insufficient power available "
1107 "to use all downstream ports\n");
1108 hub
->mA_per_port
= 100; /* 7.2.1.1 */
1110 } else { /* Self-powered external hub */
1111 /* FIXME: What about battery-powered external hubs that
1112 * provide less current per port? */
1113 hub
->mA_per_port
= 500;
1115 if (hub
->mA_per_port
< 500)
1116 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
1119 /* Update the HCD's internal representation of this hub before khubd
1120 * starts getting port status changes for devices under the hub.
1122 hcd
= bus_to_hcd(hdev
->bus
);
1123 if (hcd
->driver
->update_hub_device
) {
1124 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1125 &hub
->tt
, GFP_KERNEL
);
1127 message
= "can't update HCD hub info";
1132 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
1134 message
= "can't get hub status";
1138 /* local power status reports aren't always correct */
1139 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
1140 dev_dbg(hub_dev
, "local power source is %s\n",
1141 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
1142 ? "lost (inactive)" : "good");
1144 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
1145 dev_dbg(hub_dev
, "%sover-current condition exists\n",
1146 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
1148 /* set up the interrupt endpoint
1149 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1150 * bytes as USB2.0[11.12.3] says because some hubs are known
1151 * to send more data (and thus cause overflow). For root hubs,
1152 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1153 * to be big enough for at least USB_MAXCHILDREN ports. */
1154 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
1155 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
1157 if (maxp
> sizeof(*hub
->buffer
))
1158 maxp
= sizeof(*hub
->buffer
);
1160 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
1166 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
1167 hub
, endpoint
->bInterval
);
1169 /* maybe cycle the hub leds */
1170 if (hub
->has_indicators
&& blinkenlights
)
1171 hub
->indicator
[0] = INDICATOR_CYCLE
;
1173 hub_activate(hub
, HUB_INIT
);
1177 dev_err (hub_dev
, "config failed, %s (err %d)\n",
1179 /* hub_disconnect() frees urb and descriptor */
1183 static void hub_release(struct kref
*kref
)
1185 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1187 usb_put_intf(to_usb_interface(hub
->intfdev
));
1191 static unsigned highspeed_hubs
;
1193 static void hub_disconnect(struct usb_interface
*intf
)
1195 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1197 /* Take the hub off the event list and don't let it be added again */
1198 spin_lock_irq(&hub_event_lock
);
1199 if (!list_empty(&hub
->event_list
)) {
1200 list_del_init(&hub
->event_list
);
1201 usb_autopm_put_interface_no_suspend(intf
);
1203 hub
->disconnected
= 1;
1204 spin_unlock_irq(&hub_event_lock
);
1206 /* Disconnect all children and quiesce the hub */
1208 hub_quiesce(hub
, HUB_DISCONNECT
);
1210 usb_set_intfdata (intf
, NULL
);
1211 hub
->hdev
->maxchild
= 0;
1213 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1216 usb_free_urb(hub
->urb
);
1217 kfree(hub
->port_owners
);
1218 kfree(hub
->descriptor
);
1222 kref_put(&hub
->kref
, hub_release
);
1225 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1227 struct usb_host_interface
*desc
;
1228 struct usb_endpoint_descriptor
*endpoint
;
1229 struct usb_device
*hdev
;
1230 struct usb_hub
*hub
;
1232 desc
= intf
->cur_altsetting
;
1233 hdev
= interface_to_usbdev(intf
);
1235 /* Hubs have proper suspend/resume support */
1236 usb_enable_autosuspend(hdev
);
1238 if (hdev
->level
== MAX_TOPO_LEVEL
) {
1240 "Unsupported bus topology: hub nested too deep\n");
1244 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1246 dev_warn(&intf
->dev
, "ignoring external hub\n");
1251 /* Some hubs have a subclass of 1, which AFAICT according to the */
1252 /* specs is not defined, but it works */
1253 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1254 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1256 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
1260 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1261 if (desc
->desc
.bNumEndpoints
!= 1)
1262 goto descriptor_error
;
1264 endpoint
= &desc
->endpoint
[0].desc
;
1266 /* If it's not an interrupt in endpoint, we'd better punt! */
1267 if (!usb_endpoint_is_int_in(endpoint
))
1268 goto descriptor_error
;
1270 /* We found a hub */
1271 dev_info (&intf
->dev
, "USB hub found\n");
1273 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1275 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1279 kref_init(&hub
->kref
);
1280 INIT_LIST_HEAD(&hub
->event_list
);
1281 hub
->intfdev
= &intf
->dev
;
1283 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1284 INIT_DELAYED_WORK(&hub
->init_work
, NULL
);
1287 usb_set_intfdata (intf
, hub
);
1288 intf
->needs_remote_wakeup
= 1;
1290 if (hdev
->speed
== USB_SPEED_HIGH
)
1293 if (hub_configure(hub
, endpoint
) >= 0)
1296 hub_disconnect (intf
);
1302 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1304 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1306 /* assert ifno == 0 (part of hub spec) */
1308 case USBDEVFS_HUB_PORTINFO
: {
1309 struct usbdevfs_hub_portinfo
*info
= user_data
;
1312 spin_lock_irq(&device_state_lock
);
1313 if (hdev
->devnum
<= 0)
1316 info
->nports
= hdev
->maxchild
;
1317 for (i
= 0; i
< info
->nports
; i
++) {
1318 if (hdev
->children
[i
] == NULL
)
1322 hdev
->children
[i
]->devnum
;
1325 spin_unlock_irq(&device_state_lock
);
1327 return info
->nports
+ 1;
1336 * Allow user programs to claim ports on a hub. When a device is attached
1337 * to one of these "claimed" ports, the program will "own" the device.
1339 static int find_port_owner(struct usb_device
*hdev
, unsigned port1
,
1342 if (hdev
->state
== USB_STATE_NOTATTACHED
)
1344 if (port1
== 0 || port1
> hdev
->maxchild
)
1347 /* This assumes that devices not managed by the hub driver
1348 * will always have maxchild equal to 0.
1350 *ppowner
= &(hdev_to_hub(hdev
)->port_owners
[port1
- 1]);
1354 /* In the following three functions, the caller must hold hdev's lock */
1355 int usb_hub_claim_port(struct usb_device
*hdev
, unsigned port1
, void *owner
)
1360 rc
= find_port_owner(hdev
, port1
, &powner
);
1369 int usb_hub_release_port(struct usb_device
*hdev
, unsigned port1
, void *owner
)
1374 rc
= find_port_owner(hdev
, port1
, &powner
);
1377 if (*powner
!= owner
)
1383 void usb_hub_release_all_ports(struct usb_device
*hdev
, void *owner
)
1388 n
= find_port_owner(hdev
, 1, &powner
);
1390 for (; n
< hdev
->maxchild
; (++n
, ++powner
)) {
1391 if (*powner
== owner
)
1397 /* The caller must hold udev's lock */
1398 bool usb_device_is_owned(struct usb_device
*udev
)
1400 struct usb_hub
*hub
;
1402 if (udev
->state
== USB_STATE_NOTATTACHED
|| !udev
->parent
)
1404 hub
= hdev_to_hub(udev
->parent
);
1405 return !!hub
->port_owners
[udev
->portnum
- 1];
1409 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1413 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1414 if (udev
->children
[i
])
1415 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1417 if (udev
->state
== USB_STATE_SUSPENDED
)
1418 udev
->active_duration
-= jiffies
;
1419 udev
->state
= USB_STATE_NOTATTACHED
;
1423 * usb_set_device_state - change a device's current state (usbcore, hcds)
1424 * @udev: pointer to device whose state should be changed
1425 * @new_state: new state value to be stored
1427 * udev->state is _not_ fully protected by the device lock. Although
1428 * most transitions are made only while holding the lock, the state can
1429 * can change to USB_STATE_NOTATTACHED at almost any time. This
1430 * is so that devices can be marked as disconnected as soon as possible,
1431 * without having to wait for any semaphores to be released. As a result,
1432 * all changes to any device's state must be protected by the
1433 * device_state_lock spinlock.
1435 * Once a device has been added to the device tree, all changes to its state
1436 * should be made using this routine. The state should _not_ be set directly.
1438 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1439 * Otherwise udev->state is set to new_state, and if new_state is
1440 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1441 * to USB_STATE_NOTATTACHED.
1443 void usb_set_device_state(struct usb_device
*udev
,
1444 enum usb_device_state new_state
)
1446 unsigned long flags
;
1448 spin_lock_irqsave(&device_state_lock
, flags
);
1449 if (udev
->state
== USB_STATE_NOTATTACHED
)
1451 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1453 /* root hub wakeup capabilities are managed out-of-band
1454 * and may involve silicon errata ... ignore them here.
1457 if (udev
->state
== USB_STATE_SUSPENDED
1458 || new_state
== USB_STATE_SUSPENDED
)
1459 ; /* No change to wakeup settings */
1460 else if (new_state
== USB_STATE_CONFIGURED
)
1461 device_set_wakeup_capable(&udev
->dev
,
1462 (udev
->actconfig
->desc
.bmAttributes
1463 & USB_CONFIG_ATT_WAKEUP
));
1465 device_set_wakeup_capable(&udev
->dev
, 0);
1467 if (udev
->state
== USB_STATE_SUSPENDED
&&
1468 new_state
!= USB_STATE_SUSPENDED
)
1469 udev
->active_duration
-= jiffies
;
1470 else if (new_state
== USB_STATE_SUSPENDED
&&
1471 udev
->state
!= USB_STATE_SUSPENDED
)
1472 udev
->active_duration
+= jiffies
;
1473 udev
->state
= new_state
;
1475 recursively_mark_NOTATTACHED(udev
);
1476 spin_unlock_irqrestore(&device_state_lock
, flags
);
1478 EXPORT_SYMBOL_GPL(usb_set_device_state
);
1481 * WUSB devices are simple: they have no hubs behind, so the mapping
1482 * device <-> virtual port number becomes 1:1. Why? to simplify the
1483 * life of the device connection logic in
1484 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1485 * handshake we need to assign a temporary address in the unauthorized
1486 * space. For simplicity we use the first virtual port number found to
1487 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1488 * and that becomes it's address [X < 128] or its unauthorized address
1491 * We add 1 as an offset to the one-based USB-stack port number
1492 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1493 * 0 is reserved by USB for default address; (b) Linux's USB stack
1494 * uses always #1 for the root hub of the controller. So USB stack's
1495 * port #1, which is wusb virtual-port #0 has address #2.
1497 * Devices connected under xHCI are not as simple. The host controller
1498 * supports virtualization, so the hardware assigns device addresses and
1499 * the HCD must setup data structures before issuing a set address
1500 * command to the hardware.
1502 static void choose_address(struct usb_device
*udev
)
1505 struct usb_bus
*bus
= udev
->bus
;
1507 /* If khubd ever becomes multithreaded, this will need a lock */
1509 devnum
= udev
->portnum
+ 1;
1510 BUG_ON(test_bit(devnum
, bus
->devmap
.devicemap
));
1512 /* Try to allocate the next devnum beginning at
1513 * bus->devnum_next. */
1514 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1517 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
,
1519 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1522 set_bit(devnum
, bus
->devmap
.devicemap
);
1523 udev
->devnum
= devnum
;
1527 static void release_address(struct usb_device
*udev
)
1529 if (udev
->devnum
> 0) {
1530 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1535 static void update_address(struct usb_device
*udev
, int devnum
)
1537 /* The address for a WUSB device is managed by wusbcore. */
1539 udev
->devnum
= devnum
;
1542 static void hub_free_dev(struct usb_device
*udev
)
1544 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
1546 /* Root hubs aren't real devices, so don't free HCD resources */
1547 if (hcd
->driver
->free_dev
&& udev
->parent
)
1548 hcd
->driver
->free_dev(hcd
, udev
);
1552 * usb_disconnect - disconnect a device (usbcore-internal)
1553 * @pdev: pointer to device being disconnected
1554 * Context: !in_interrupt ()
1556 * Something got disconnected. Get rid of it and all of its children.
1558 * If *pdev is a normal device then the parent hub must already be locked.
1559 * If *pdev is a root hub then this routine will acquire the
1560 * usb_bus_list_lock on behalf of the caller.
1562 * Only hub drivers (including virtual root hub drivers for host
1563 * controllers) should ever call this.
1565 * This call is synchronous, and may not be used in an interrupt context.
1567 void usb_disconnect(struct usb_device
**pdev
)
1569 struct usb_device
*udev
= *pdev
;
1573 pr_debug ("%s nodev\n", __func__
);
1577 /* mark the device as inactive, so any further urb submissions for
1578 * this device (and any of its children) will fail immediately.
1579 * this quiesces everyting except pending urbs.
1581 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1582 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1584 usb_lock_device(udev
);
1586 /* Free up all the children before we remove this device */
1587 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1588 if (udev
->children
[i
])
1589 usb_disconnect(&udev
->children
[i
]);
1592 /* deallocate hcd/hardware state ... nuking all pending urbs and
1593 * cleaning up all state associated with the current configuration
1594 * so that the hardware is now fully quiesced.
1596 dev_dbg (&udev
->dev
, "unregistering device\n");
1597 usb_disable_device(udev
, 0);
1598 usb_hcd_synchronize_unlinks(udev
);
1600 usb_remove_ep_devs(&udev
->ep0
);
1601 usb_unlock_device(udev
);
1603 /* Unregister the device. The device driver is responsible
1604 * for de-configuring the device and invoking the remove-device
1605 * notifier chain (used by usbfs and possibly others).
1607 device_del(&udev
->dev
);
1609 /* Free the device number and delete the parent's children[]
1610 * (or root_hub) pointer.
1612 release_address(udev
);
1614 /* Avoid races with recursively_mark_NOTATTACHED() */
1615 spin_lock_irq(&device_state_lock
);
1617 spin_unlock_irq(&device_state_lock
);
1621 put_device(&udev
->dev
);
1624 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1625 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1629 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1632 static void announce_device(struct usb_device
*udev
)
1634 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1635 le16_to_cpu(udev
->descriptor
.idVendor
),
1636 le16_to_cpu(udev
->descriptor
.idProduct
));
1637 dev_info(&udev
->dev
,
1638 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
1639 udev
->descriptor
.iManufacturer
,
1640 udev
->descriptor
.iProduct
,
1641 udev
->descriptor
.iSerialNumber
);
1642 show_string(udev
, "Product", udev
->product
);
1643 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1644 show_string(udev
, "SerialNumber", udev
->serial
);
1647 static inline void announce_device(struct usb_device
*udev
) { }
1650 #ifdef CONFIG_USB_OTG
1651 #include "otg_whitelist.h"
1655 * usb_enumerate_device_otg - FIXME (usbcore-internal)
1656 * @udev: newly addressed device (in ADDRESS state)
1658 * Finish enumeration for On-The-Go devices
1660 static int usb_enumerate_device_otg(struct usb_device
*udev
)
1664 #ifdef CONFIG_USB_OTG
1666 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1667 * to wake us after we've powered off VBUS; and HNP, switching roles
1668 * "host" to "peripheral". The OTG descriptor helps figure this out.
1670 if (!udev
->bus
->is_b_host
1672 && udev
->parent
== udev
->bus
->root_hub
) {
1673 struct usb_otg_descriptor
*desc
= NULL
;
1674 struct usb_bus
*bus
= udev
->bus
;
1676 /* descriptor may appear anywhere in config */
1677 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1678 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1679 USB_DT_OTG
, (void **) &desc
) == 0) {
1680 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1681 unsigned port1
= udev
->portnum
;
1683 dev_info(&udev
->dev
,
1684 "Dual-Role OTG device on %sHNP port\n",
1685 (port1
== bus
->otg_port
)
1688 /* enable HNP before suspend, it's simpler */
1689 if (port1
== bus
->otg_port
)
1690 bus
->b_hnp_enable
= 1;
1691 err
= usb_control_msg(udev
,
1692 usb_sndctrlpipe(udev
, 0),
1693 USB_REQ_SET_FEATURE
, 0,
1695 ? USB_DEVICE_B_HNP_ENABLE
1696 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1697 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1699 /* OTG MESSAGE: report errors here,
1700 * customize to match your product.
1702 dev_info(&udev
->dev
,
1703 "can't set HNP mode: %d\n",
1705 bus
->b_hnp_enable
= 0;
1711 if (!is_targeted(udev
)) {
1713 /* Maybe it can talk to us, though we can't talk to it.
1714 * (Includes HNP test device.)
1716 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1717 err
= usb_port_suspend(udev
, PMSG_SUSPEND
);
1719 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1731 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
1732 * @udev: newly addressed device (in ADDRESS state)
1734 * This is only called by usb_new_device() and usb_authorize_device()
1735 * and FIXME -- all comments that apply to them apply here wrt to
1738 * If the device is WUSB and not authorized, we don't attempt to read
1739 * the string descriptors, as they will be errored out by the device
1740 * until it has been authorized.
1742 static int usb_enumerate_device(struct usb_device
*udev
)
1746 if (udev
->config
== NULL
) {
1747 err
= usb_get_configuration(udev
);
1749 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1754 if (udev
->wusb
== 1 && udev
->authorized
== 0) {
1755 udev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1756 udev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1757 udev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1760 /* read the standard strings and cache them if present */
1761 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1762 udev
->manufacturer
= usb_cache_string(udev
,
1763 udev
->descriptor
.iManufacturer
);
1764 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1766 err
= usb_enumerate_device_otg(udev
);
1773 * usb_new_device - perform initial device setup (usbcore-internal)
1774 * @udev: newly addressed device (in ADDRESS state)
1776 * This is called with devices which have been detected but not fully
1777 * enumerated. The device descriptor is available, but not descriptors
1778 * for any device configuration. The caller must have locked either
1779 * the parent hub (if udev is a normal device) or else the
1780 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1781 * udev has already been installed, but udev is not yet visible through
1782 * sysfs or other filesystem code.
1784 * It will return if the device is configured properly or not. Zero if
1785 * the interface was registered with the driver core; else a negative
1788 * This call is synchronous, and may not be used in an interrupt context.
1790 * Only the hub driver or root-hub registrar should ever call this.
1792 int usb_new_device(struct usb_device
*udev
)
1797 /* Initialize non-root-hub device wakeup to disabled;
1798 * device (un)configuration controls wakeup capable
1799 * sysfs power/wakeup controls wakeup enabled/disabled
1801 device_init_wakeup(&udev
->dev
, 0);
1804 /* Tell the runtime-PM framework the device is active */
1805 pm_runtime_set_active(&udev
->dev
);
1806 pm_runtime_get_noresume(&udev
->dev
);
1807 pm_runtime_use_autosuspend(&udev
->dev
);
1808 pm_runtime_enable(&udev
->dev
);
1810 /* By default, forbid autosuspend for all devices. It will be
1811 * allowed for hubs during binding.
1813 usb_disable_autosuspend(udev
);
1815 err
= usb_enumerate_device(udev
); /* Read descriptors */
1818 dev_dbg(&udev
->dev
, "udev %d, busnum %d, minor = %d\n",
1819 udev
->devnum
, udev
->bus
->busnum
,
1820 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1821 /* export the usbdev device-node for libusb */
1822 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1823 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1825 /* Tell the world! */
1826 announce_device(udev
);
1828 device_enable_async_suspend(&udev
->dev
);
1829 /* Register the device. The device driver is responsible
1830 * for configuring the device and invoking the add-device
1831 * notifier chain (used by usbfs and possibly others).
1833 err
= device_add(&udev
->dev
);
1835 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1839 (void) usb_create_ep_devs(&udev
->dev
, &udev
->ep0
, udev
);
1840 usb_mark_last_busy(udev
);
1841 pm_runtime_put_sync_autosuspend(&udev
->dev
);
1845 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1846 pm_runtime_disable(&udev
->dev
);
1847 pm_runtime_set_suspended(&udev
->dev
);
1853 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1854 * @usb_dev: USB device
1856 * Move the USB device to a very basic state where interfaces are disabled
1857 * and the device is in fact unconfigured and unusable.
1859 * We share a lock (that we have) with device_del(), so we need to
1862 int usb_deauthorize_device(struct usb_device
*usb_dev
)
1864 usb_lock_device(usb_dev
);
1865 if (usb_dev
->authorized
== 0)
1866 goto out_unauthorized
;
1868 usb_dev
->authorized
= 0;
1869 usb_set_configuration(usb_dev
, -1);
1871 kfree(usb_dev
->product
);
1872 usb_dev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1873 kfree(usb_dev
->manufacturer
);
1874 usb_dev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1875 kfree(usb_dev
->serial
);
1876 usb_dev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1878 usb_destroy_configuration(usb_dev
);
1879 usb_dev
->descriptor
.bNumConfigurations
= 0;
1882 usb_unlock_device(usb_dev
);
1887 int usb_authorize_device(struct usb_device
*usb_dev
)
1891 usb_lock_device(usb_dev
);
1892 if (usb_dev
->authorized
== 1)
1893 goto out_authorized
;
1895 result
= usb_autoresume_device(usb_dev
);
1897 dev_err(&usb_dev
->dev
,
1898 "can't autoresume for authorization: %d\n", result
);
1899 goto error_autoresume
;
1901 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
1903 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
1904 "authorization: %d\n", result
);
1905 goto error_device_descriptor
;
1908 kfree(usb_dev
->product
);
1909 usb_dev
->product
= NULL
;
1910 kfree(usb_dev
->manufacturer
);
1911 usb_dev
->manufacturer
= NULL
;
1912 kfree(usb_dev
->serial
);
1913 usb_dev
->serial
= NULL
;
1915 usb_dev
->authorized
= 1;
1916 result
= usb_enumerate_device(usb_dev
);
1918 goto error_enumerate
;
1919 /* Choose and set the configuration. This registers the interfaces
1920 * with the driver core and lets interface drivers bind to them.
1922 c
= usb_choose_configuration(usb_dev
);
1924 result
= usb_set_configuration(usb_dev
, c
);
1926 dev_err(&usb_dev
->dev
,
1927 "can't set config #%d, error %d\n", c
, result
);
1928 /* This need not be fatal. The user can try to
1929 * set other configurations. */
1932 dev_info(&usb_dev
->dev
, "authorized to connect\n");
1935 error_device_descriptor
:
1936 usb_autosuspend_device(usb_dev
);
1939 usb_unlock_device(usb_dev
); // complements locktree
1944 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1945 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1947 struct usb_hcd
*hcd
;
1948 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1950 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1951 return hcd
->wireless
;
1955 #define PORT_RESET_TRIES 5
1956 #define SET_ADDRESS_TRIES 2
1957 #define GET_DESCRIPTOR_TRIES 2
1958 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1959 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1961 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1962 #define HUB_SHORT_RESET_TIME 10
1963 #define HUB_LONG_RESET_TIME 200
1964 #define HUB_RESET_TIMEOUT 500
1966 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1967 struct usb_device
*udev
, unsigned int delay
)
1969 int delay_time
, ret
;
1973 for (delay_time
= 0;
1974 delay_time
< HUB_RESET_TIMEOUT
;
1975 delay_time
+= delay
) {
1976 /* wait to give the device a chance to reset */
1979 /* read and decode port status */
1980 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1984 /* Device went away? */
1985 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1988 /* bomb out completely if the connection bounced */
1989 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1992 /* if we`ve finished resetting, then break out of the loop */
1993 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1994 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1995 if (hub_is_wusb(hub
))
1996 udev
->speed
= USB_SPEED_WIRELESS
;
1997 else if (portstatus
& USB_PORT_STAT_SUPER_SPEED
)
1998 udev
->speed
= USB_SPEED_SUPER
;
1999 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
2000 udev
->speed
= USB_SPEED_HIGH
;
2001 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
2002 udev
->speed
= USB_SPEED_LOW
;
2004 udev
->speed
= USB_SPEED_FULL
;
2008 /* switch to the long delay after two short delay failures */
2009 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
2010 delay
= HUB_LONG_RESET_TIME
;
2012 dev_dbg (hub
->intfdev
,
2013 "port %d not reset yet, waiting %dms\n",
2020 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
2021 struct usb_device
*udev
, unsigned int delay
)
2024 struct usb_hcd
*hcd
;
2026 hcd
= bus_to_hcd(udev
->bus
);
2027 /* Block EHCI CF initialization during the port reset.
2028 * Some companion controllers don't like it when they mix.
2030 down_read(&ehci_cf_port_reset_rwsem
);
2032 /* Reset the port */
2033 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
2034 status
= set_port_feature(hub
->hdev
,
2035 port1
, USB_PORT_FEAT_RESET
);
2037 dev_err(hub
->intfdev
,
2038 "cannot reset port %d (err = %d)\n",
2041 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
2042 if (status
&& status
!= -ENOTCONN
)
2043 dev_dbg(hub
->intfdev
,
2044 "port_wait_reset: err = %d\n",
2048 /* return on disconnect or reset */
2051 /* TRSTRCY = 10 ms; plus some extra */
2053 update_address(udev
, 0);
2054 if (hcd
->driver
->reset_device
) {
2055 status
= hcd
->driver
->reset_device(hcd
, udev
);
2057 dev_err(&udev
->dev
, "Cannot reset "
2058 "HCD device state\n");
2065 clear_port_feature(hub
->hdev
,
2066 port1
, USB_PORT_FEAT_C_RESET
);
2067 /* FIXME need disconnect() for NOTATTACHED device */
2068 usb_set_device_state(udev
, status
2069 ? USB_STATE_NOTATTACHED
2070 : USB_STATE_DEFAULT
);
2074 dev_dbg (hub
->intfdev
,
2075 "port %d not enabled, trying reset again...\n",
2077 delay
= HUB_LONG_RESET_TIME
;
2080 dev_err (hub
->intfdev
,
2081 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2085 up_read(&ehci_cf_port_reset_rwsem
);
2091 #define MASK_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | \
2092 USB_PORT_STAT_SUSPEND)
2093 #define WANT_BITS (USB_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION)
2095 /* Determine whether the device on a port is ready for a normal resume,
2096 * is ready for a reset-resume, or should be disconnected.
2098 static int check_port_resume_type(struct usb_device
*udev
,
2099 struct usb_hub
*hub
, int port1
,
2100 int status
, unsigned portchange
, unsigned portstatus
)
2102 /* Is the device still present? */
2103 if (status
|| (portstatus
& MASK_BITS
) != WANT_BITS
) {
2108 /* Can't do a normal resume if the port isn't enabled,
2109 * so try a reset-resume instead.
2111 else if (!(portstatus
& USB_PORT_STAT_ENABLE
) && !udev
->reset_resume
) {
2112 if (udev
->persist_enabled
)
2113 udev
->reset_resume
= 1;
2119 dev_dbg(hub
->intfdev
,
2120 "port %d status %04x.%04x after resume, %d\n",
2121 port1
, portchange
, portstatus
, status
);
2122 } else if (udev
->reset_resume
) {
2124 /* Late port handoff can set status-change bits */
2125 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
2126 clear_port_feature(hub
->hdev
, port1
,
2127 USB_PORT_FEAT_C_CONNECTION
);
2128 if (portchange
& USB_PORT_STAT_C_ENABLE
)
2129 clear_port_feature(hub
->hdev
, port1
,
2130 USB_PORT_FEAT_C_ENABLE
);
2136 #ifdef CONFIG_USB_SUSPEND
2139 * usb_port_suspend - suspend a usb device's upstream port
2140 * @udev: device that's no longer in active use, not a root hub
2141 * Context: must be able to sleep; device not locked; pm locks held
2143 * Suspends a USB device that isn't in active use, conserving power.
2144 * Devices may wake out of a suspend, if anything important happens,
2145 * using the remote wakeup mechanism. They may also be taken out of
2146 * suspend by the host, using usb_port_resume(). It's also routine
2147 * to disconnect devices while they are suspended.
2149 * This only affects the USB hardware for a device; its interfaces
2150 * (and, for hubs, child devices) must already have been suspended.
2152 * Selective port suspend reduces power; most suspended devices draw
2153 * less than 500 uA. It's also used in OTG, along with remote wakeup.
2154 * All devices below the suspended port are also suspended.
2156 * Devices leave suspend state when the host wakes them up. Some devices
2157 * also support "remote wakeup", where the device can activate the USB
2158 * tree above them to deliver data, such as a keypress or packet. In
2159 * some cases, this wakes the USB host.
2161 * Suspending OTG devices may trigger HNP, if that's been enabled
2162 * between a pair of dual-role devices. That will change roles, such
2163 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
2165 * Devices on USB hub ports have only one "suspend" state, corresponding
2166 * to ACPI D2, "may cause the device to lose some context".
2167 * State transitions include:
2169 * - suspend, resume ... when the VBUS power link stays live
2170 * - suspend, disconnect ... VBUS lost
2172 * Once VBUS drop breaks the circuit, the port it's using has to go through
2173 * normal re-enumeration procedures, starting with enabling VBUS power.
2174 * Other than re-initializing the hub (plug/unplug, except for root hubs),
2175 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
2176 * timer, no SRP, no requests through sysfs.
2178 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
2179 * the root hub for their bus goes into global suspend ... so we don't
2180 * (falsely) update the device power state to say it suspended.
2182 * Returns 0 on success, else negative errno.
2184 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
2186 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2187 int port1
= udev
->portnum
;
2190 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
2192 /* enable remote wakeup when appropriate; this lets the device
2193 * wake up the upstream hub (including maybe the root hub).
2195 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
2196 * we don't explicitly enable it here.
2198 if (udev
->do_remote_wakeup
) {
2199 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2200 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
2201 USB_DEVICE_REMOTE_WAKEUP
, 0,
2203 USB_CTRL_SET_TIMEOUT
);
2205 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
2207 /* bail if autosuspend is requested */
2208 if (msg
.event
& PM_EVENT_AUTO
)
2214 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
2216 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
2218 /* paranoia: "should not happen" */
2219 if (udev
->do_remote_wakeup
)
2220 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2221 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
2222 USB_DEVICE_REMOTE_WAKEUP
, 0,
2224 USB_CTRL_SET_TIMEOUT
);
2226 /* device has up to 10 msec to fully suspend */
2227 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
2228 (msg
.event
& PM_EVENT_AUTO
? "auto-" : ""));
2229 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
2232 usb_mark_last_busy(hub
->hdev
);
2237 * If the USB "suspend" state is in use (rather than "global suspend"),
2238 * many devices will be individually taken out of suspend state using
2239 * special "resume" signaling. This routine kicks in shortly after
2240 * hardware resume signaling is finished, either because of selective
2241 * resume (by host) or remote wakeup (by device) ... now see what changed
2242 * in the tree that's rooted at this device.
2244 * If @udev->reset_resume is set then the device is reset before the
2245 * status check is done.
2247 static int finish_port_resume(struct usb_device
*udev
)
2252 /* caller owns the udev device lock */
2253 dev_dbg(&udev
->dev
, "%s\n",
2254 udev
->reset_resume
? "finish reset-resume" : "finish resume");
2256 /* usb ch9 identifies four variants of SUSPENDED, based on what
2257 * state the device resumes to. Linux currently won't see the
2258 * first two on the host side; they'd be inside hub_port_init()
2259 * during many timeouts, but khubd can't suspend until later.
2261 usb_set_device_state(udev
, udev
->actconfig
2262 ? USB_STATE_CONFIGURED
2263 : USB_STATE_ADDRESS
);
2265 /* 10.5.4.5 says not to reset a suspended port if the attached
2266 * device is enabled for remote wakeup. Hence the reset
2267 * operation is carried out here, after the port has been
2270 if (udev
->reset_resume
)
2272 status
= usb_reset_and_verify_device(udev
);
2274 /* 10.5.4.5 says be sure devices in the tree are still there.
2275 * For now let's assume the device didn't go crazy on resume,
2276 * and device drivers will know about any resume quirks.
2280 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
2282 status
= (status
> 0 ? 0 : -ENODEV
);
2284 /* If a normal resume failed, try doing a reset-resume */
2285 if (status
&& !udev
->reset_resume
&& udev
->persist_enabled
) {
2286 dev_dbg(&udev
->dev
, "retry with reset-resume\n");
2287 udev
->reset_resume
= 1;
2288 goto retry_reset_resume
;
2293 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
2295 } else if (udev
->actconfig
) {
2296 le16_to_cpus(&devstatus
);
2297 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
2298 status
= usb_control_msg(udev
,
2299 usb_sndctrlpipe(udev
, 0),
2300 USB_REQ_CLEAR_FEATURE
,
2302 USB_DEVICE_REMOTE_WAKEUP
, 0,
2304 USB_CTRL_SET_TIMEOUT
);
2307 "disable remote wakeup, status %d\n",
2316 * usb_port_resume - re-activate a suspended usb device's upstream port
2317 * @udev: device to re-activate, not a root hub
2318 * Context: must be able to sleep; device not locked; pm locks held
2320 * This will re-activate the suspended device, increasing power usage
2321 * while letting drivers communicate again with its endpoints.
2322 * USB resume explicitly guarantees that the power session between
2323 * the host and the device is the same as it was when the device
2326 * If @udev->reset_resume is set then this routine won't check that the
2327 * port is still enabled. Furthermore, finish_port_resume() above will
2328 * reset @udev. The end result is that a broken power session can be
2329 * recovered and @udev will appear to persist across a loss of VBUS power.
2331 * For example, if a host controller doesn't maintain VBUS suspend current
2332 * during a system sleep or is reset when the system wakes up, all the USB
2333 * power sessions below it will be broken. This is especially troublesome
2334 * for mass-storage devices containing mounted filesystems, since the
2335 * device will appear to have disconnected and all the memory mappings
2336 * to it will be lost. Using the USB_PERSIST facility, the device can be
2337 * made to appear as if it had not disconnected.
2339 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
2340 * every effort to insure that the same device is present after the
2341 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2342 * quite possible for a device to remain unaltered but its media to be
2343 * changed. If the user replaces a flash memory card while the system is
2344 * asleep, he will have only himself to blame when the filesystem on the
2345 * new card is corrupted and the system crashes.
2347 * Returns 0 on success, else negative errno.
2349 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
2351 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2352 int port1
= udev
->portnum
;
2354 u16 portchange
, portstatus
;
2356 /* Skip the initial Clear-Suspend step for a remote wakeup */
2357 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2358 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
2359 goto SuspendCleared
;
2361 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2363 set_bit(port1
, hub
->busy_bits
);
2365 /* see 7.1.7.7; affects power usage, but not budgeting */
2366 status
= clear_port_feature(hub
->hdev
,
2367 port1
, USB_PORT_FEAT_SUSPEND
);
2369 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
2372 /* drive resume for at least 20 msec */
2373 dev_dbg(&udev
->dev
, "usb %sresume\n",
2374 (msg
.event
& PM_EVENT_AUTO
? "auto-" : ""));
2377 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2378 * stop resume signaling. Then finish the resume
2381 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2383 /* TRSMRCY = 10 msec */
2389 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
2390 clear_port_feature(hub
->hdev
, port1
,
2391 USB_PORT_FEAT_C_SUSPEND
);
2394 clear_bit(port1
, hub
->busy_bits
);
2396 status
= check_port_resume_type(udev
,
2397 hub
, port1
, status
, portchange
, portstatus
);
2399 status
= finish_port_resume(udev
);
2401 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2402 hub_port_logical_disconnect(hub
, port1
);
2407 /* caller has locked udev */
2408 int usb_remote_wakeup(struct usb_device
*udev
)
2412 if (udev
->state
== USB_STATE_SUSPENDED
) {
2413 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
2414 status
= usb_autoresume_device(udev
);
2416 /* Let the drivers do their thing, then... */
2417 usb_autosuspend_device(udev
);
2423 #else /* CONFIG_USB_SUSPEND */
2425 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2427 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
2432 /* However we may need to do a reset-resume */
2434 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
2436 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2437 int port1
= udev
->portnum
;
2439 u16 portchange
, portstatus
;
2441 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2442 status
= check_port_resume_type(udev
,
2443 hub
, port1
, status
, portchange
, portstatus
);
2446 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2447 hub_port_logical_disconnect(hub
, port1
);
2448 } else if (udev
->reset_resume
) {
2449 dev_dbg(&udev
->dev
, "reset-resume\n");
2450 status
= usb_reset_and_verify_device(udev
);
2457 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
2459 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2460 struct usb_device
*hdev
= hub
->hdev
;
2463 /* fail if children aren't already suspended */
2464 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
2465 struct usb_device
*udev
;
2467 udev
= hdev
->children
[port1
-1];
2468 if (udev
&& udev
->can_submit
) {
2469 if (!(msg
.event
& PM_EVENT_AUTO
))
2470 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
2476 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2478 /* stop khubd and related activity */
2479 hub_quiesce(hub
, HUB_SUSPEND
);
2483 static int hub_resume(struct usb_interface
*intf
)
2485 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2487 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2488 hub_activate(hub
, HUB_RESUME
);
2492 static int hub_reset_resume(struct usb_interface
*intf
)
2494 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2496 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2497 hub_activate(hub
, HUB_RESET_RESUME
);
2502 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2503 * @rhdev: struct usb_device for the root hub
2505 * The USB host controller driver calls this function when its root hub
2506 * is resumed and Vbus power has been interrupted or the controller
2507 * has been reset. The routine marks @rhdev as having lost power.
2508 * When the hub driver is resumed it will take notice and carry out
2509 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2510 * the others will be disconnected.
2512 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
2514 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
2515 rhdev
->reset_resume
= 1;
2517 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
2519 #else /* CONFIG_PM */
2521 #define hub_suspend NULL
2522 #define hub_resume NULL
2523 #define hub_reset_resume NULL
2527 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2529 * Between connect detection and reset signaling there must be a delay
2530 * of 100ms at least for debounce and power-settling. The corresponding
2531 * timer shall restart whenever the downstream port detects a disconnect.
2533 * Apparently there are some bluetooth and irda-dongles and a number of
2534 * low-speed devices for which this debounce period may last over a second.
2535 * Not covered by the spec - but easy to deal with.
2537 * This implementation uses a 1500ms total debounce timeout; if the
2538 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2539 * every 25ms for transient disconnects. When the port status has been
2540 * unchanged for 100ms it returns the port status.
2542 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2545 int total_time
, stable_time
= 0;
2546 u16 portchange
, portstatus
;
2547 unsigned connection
= 0xffff;
2549 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2550 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2554 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2555 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2556 stable_time
+= HUB_DEBOUNCE_STEP
;
2557 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2561 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2564 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2565 clear_port_feature(hub
->hdev
, port1
,
2566 USB_PORT_FEAT_C_CONNECTION
);
2569 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2571 msleep(HUB_DEBOUNCE_STEP
);
2574 dev_dbg (hub
->intfdev
,
2575 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2576 port1
, total_time
, stable_time
, portstatus
);
2578 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2583 void usb_ep0_reinit(struct usb_device
*udev
)
2585 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
, true);
2586 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
, true);
2587 usb_enable_endpoint(udev
, &udev
->ep0
, true);
2589 EXPORT_SYMBOL_GPL(usb_ep0_reinit
);
2591 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2592 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2594 static int hub_set_address(struct usb_device
*udev
, int devnum
)
2597 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2600 * The host controller will choose the device address,
2601 * instead of the core having chosen it earlier
2603 if (!hcd
->driver
->address_device
&& devnum
<= 1)
2605 if (udev
->state
== USB_STATE_ADDRESS
)
2607 if (udev
->state
!= USB_STATE_DEFAULT
)
2609 if (hcd
->driver
->address_device
)
2610 retval
= hcd
->driver
->address_device(hcd
, udev
);
2612 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2613 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
2614 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2616 update_address(udev
, devnum
);
2617 /* Device now using proper address. */
2618 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2619 usb_ep0_reinit(udev
);
2624 /* Reset device, (re)assign address, get device descriptor.
2625 * Device connection must be stable, no more debouncing needed.
2626 * Returns device in USB_STATE_ADDRESS, except on error.
2628 * If this is called for an already-existing device (as part of
2629 * usb_reset_and_verify_device), the caller must own the device lock. For a
2630 * newly detected device that is not accessible through any global
2631 * pointers, it's not necessary to lock the device.
2634 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2637 static DEFINE_MUTEX(usb_address0_mutex
);
2639 struct usb_device
*hdev
= hub
->hdev
;
2640 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2642 unsigned delay
= HUB_SHORT_RESET_TIME
;
2643 enum usb_device_speed oldspeed
= udev
->speed
;
2645 int devnum
= udev
->devnum
;
2647 /* root hub ports have a slightly longer reset period
2648 * (from USB 2.0 spec, section 7.1.7.5)
2650 if (!hdev
->parent
) {
2651 delay
= HUB_ROOT_RESET_TIME
;
2652 if (port1
== hdev
->bus
->otg_port
)
2653 hdev
->bus
->b_hnp_enable
= 0;
2656 /* Some low speed devices have problems with the quick delay, so */
2657 /* be a bit pessimistic with those devices. RHbug #23670 */
2658 if (oldspeed
== USB_SPEED_LOW
)
2659 delay
= HUB_LONG_RESET_TIME
;
2661 mutex_lock(&usb_address0_mutex
);
2663 if (!udev
->config
&& oldspeed
== USB_SPEED_SUPER
) {
2664 /* Don't reset USB 3.0 devices during an initial setup */
2665 usb_set_device_state(udev
, USB_STATE_DEFAULT
);
2667 /* Reset the device; full speed may morph to high speed */
2668 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
2669 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2670 if (retval
< 0) /* error or disconnect */
2672 /* success, speed is known */
2676 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2677 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2680 oldspeed
= udev
->speed
;
2682 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2683 * it's fixed size except for full speed devices.
2684 * For Wireless USB devices, ep0 max packet is always 512 (tho
2685 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2687 switch (udev
->speed
) {
2688 case USB_SPEED_SUPER
:
2689 case USB_SPEED_WIRELESS
: /* fixed at 512 */
2690 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(512);
2692 case USB_SPEED_HIGH
: /* fixed at 64 */
2693 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
2695 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2696 /* to determine the ep0 maxpacket size, try to read
2697 * the device descriptor to get bMaxPacketSize0 and
2698 * then correct our initial guess.
2700 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
2702 case USB_SPEED_LOW
: /* fixed at 8 */
2703 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(8);
2710 switch (udev
->speed
) {
2711 case USB_SPEED_LOW
: speed
= "low"; break;
2712 case USB_SPEED_FULL
: speed
= "full"; break;
2713 case USB_SPEED_HIGH
: speed
= "high"; break;
2714 case USB_SPEED_SUPER
:
2717 case USB_SPEED_WIRELESS
:
2721 default: speed
= "?"; break;
2723 if (udev
->speed
!= USB_SPEED_SUPER
)
2724 dev_info(&udev
->dev
,
2725 "%s %s speed %sUSB device using %s and address %d\n",
2726 (udev
->config
) ? "reset" : "new", speed
, type
,
2727 udev
->bus
->controller
->driver
->name
, devnum
);
2729 /* Set up TT records, if needed */
2731 udev
->tt
= hdev
->tt
;
2732 udev
->ttport
= hdev
->ttport
;
2733 } else if (udev
->speed
!= USB_SPEED_HIGH
2734 && hdev
->speed
== USB_SPEED_HIGH
) {
2735 udev
->tt
= &hub
->tt
;
2736 udev
->ttport
= port1
;
2739 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2740 * Because device hardware and firmware is sometimes buggy in
2741 * this area, and this is how Linux has done it for ages.
2742 * Change it cautiously.
2744 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2745 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2746 * so it may help with some non-standards-compliant devices.
2747 * Otherwise we start with SET_ADDRESS and then try to read the
2748 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2751 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2753 * An xHCI controller cannot send any packets to a device until
2754 * a set address command successfully completes.
2756 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
)) {
2757 struct usb_device_descriptor
*buf
;
2760 #define GET_DESCRIPTOR_BUFSIZE 64
2761 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2767 /* Retry on all errors; some devices are flakey.
2768 * 255 is for WUSB devices, we actually need to use
2769 * 512 (WUSB1.0[4.8.1]).
2771 for (j
= 0; j
< 3; ++j
) {
2772 buf
->bMaxPacketSize0
= 0;
2773 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2774 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2775 USB_DT_DEVICE
<< 8, 0,
2776 buf
, GET_DESCRIPTOR_BUFSIZE
,
2777 initial_descriptor_timeout
);
2778 switch (buf
->bMaxPacketSize0
) {
2779 case 8: case 16: case 32: case 64: case 255:
2780 if (buf
->bDescriptorType
==
2794 udev
->descriptor
.bMaxPacketSize0
=
2795 buf
->bMaxPacketSize0
;
2798 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2799 if (retval
< 0) /* error or disconnect */
2801 if (oldspeed
!= udev
->speed
) {
2803 "device reset changed speed!\n");
2809 "device descriptor read/64, error %d\n",
2814 #undef GET_DESCRIPTOR_BUFSIZE
2818 * If device is WUSB, we already assigned an
2819 * unauthorized address in the Connect Ack sequence;
2820 * authorization will assign the final address.
2822 if (udev
->wusb
== 0) {
2823 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2824 retval
= hub_set_address(udev
, devnum
);
2831 "device not accepting address %d, error %d\n",
2835 if (udev
->speed
== USB_SPEED_SUPER
) {
2836 devnum
= udev
->devnum
;
2837 dev_info(&udev
->dev
,
2838 "%s SuperSpeed USB device using %s and address %d\n",
2839 (udev
->config
) ? "reset" : "new",
2840 udev
->bus
->controller
->driver
->name
, devnum
);
2843 /* cope with hardware quirkiness:
2844 * - let SET_ADDRESS settle, some device hardware wants it
2845 * - read ep0 maxpacket even for high and low speed,
2848 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
))
2852 retval
= usb_get_device_descriptor(udev
, 8);
2855 "device descriptor read/8, error %d\n",
2867 if (udev
->descriptor
.bMaxPacketSize0
== 0xff ||
2868 udev
->speed
== USB_SPEED_SUPER
)
2871 i
= udev
->descriptor
.bMaxPacketSize0
;
2872 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2873 if (udev
->speed
== USB_SPEED_LOW
||
2874 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2875 dev_err(&udev
->dev
, "Invalid ep0 maxpacket: %d\n", i
);
2879 if (udev
->speed
== USB_SPEED_FULL
)
2880 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2882 dev_warn(&udev
->dev
, "Using ep0 maxpacket: %d\n", i
);
2883 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2884 usb_ep0_reinit(udev
);
2887 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2888 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2889 dev_err(&udev
->dev
, "device descriptor read/all, error %d\n",
2897 /* notify HCD that we have a device connected and addressed */
2898 if (hcd
->driver
->update_device
)
2899 hcd
->driver
->update_device(hcd
, udev
);
2902 hub_port_disable(hub
, port1
, 0);
2903 update_address(udev
, devnum
); /* for disconnect processing */
2905 mutex_unlock(&usb_address0_mutex
);
2910 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2912 struct usb_qualifier_descriptor
*qual
;
2915 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2919 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2920 qual
, sizeof *qual
);
2921 if (status
== sizeof *qual
) {
2922 dev_info(&udev
->dev
, "not running at top speed; "
2923 "connect to a high speed hub\n");
2924 /* hub LEDs are probably harder to miss than syslog */
2925 if (hub
->has_indicators
) {
2926 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2927 schedule_delayed_work (&hub
->leds
, 0);
2934 hub_power_remaining (struct usb_hub
*hub
)
2936 struct usb_device
*hdev
= hub
->hdev
;
2940 if (!hub
->limited_power
)
2943 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2944 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2945 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2951 /* Unconfigured devices may not use more than 100mA,
2952 * or 8mA for OTG ports */
2953 if (udev
->actconfig
)
2954 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2955 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2959 if (delta
> hub
->mA_per_port
)
2960 dev_warn(&udev
->dev
,
2961 "%dmA is over %umA budget for port %d!\n",
2962 delta
, hub
->mA_per_port
, port1
);
2965 if (remaining
< 0) {
2966 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2973 /* Handle physical or logical connection change events.
2974 * This routine is called when:
2975 * a port connection-change occurs;
2976 * a port enable-change occurs (often caused by EMI);
2977 * usb_reset_and_verify_device() encounters changed descriptors (as from
2978 * a firmware download)
2979 * caller already locked the hub
2981 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2982 u16 portstatus
, u16 portchange
)
2984 struct usb_device
*hdev
= hub
->hdev
;
2985 struct device
*hub_dev
= hub
->intfdev
;
2986 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2987 unsigned wHubCharacteristics
=
2988 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2989 struct usb_device
*udev
;
2993 "port %d, status %04x, change %04x, %s\n",
2994 port1
, portstatus
, portchange
, portspeed (portstatus
));
2996 if (hub
->has_indicators
) {
2997 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2998 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
3001 #ifdef CONFIG_USB_OTG
3002 /* during HNP, don't repeat the debounce */
3003 if (hdev
->bus
->is_b_host
)
3004 portchange
&= ~(USB_PORT_STAT_C_CONNECTION
|
3005 USB_PORT_STAT_C_ENABLE
);
3008 /* Try to resuscitate an existing device */
3009 udev
= hdev
->children
[port1
-1];
3010 if ((portstatus
& USB_PORT_STAT_CONNECTION
) && udev
&&
3011 udev
->state
!= USB_STATE_NOTATTACHED
) {
3012 usb_lock_device(udev
);
3013 if (portstatus
& USB_PORT_STAT_ENABLE
) {
3014 status
= 0; /* Nothing to do */
3016 #ifdef CONFIG_USB_SUSPEND
3017 } else if (udev
->state
== USB_STATE_SUSPENDED
&&
3018 udev
->persist_enabled
) {
3019 /* For a suspended device, treat this as a
3020 * remote wakeup event.
3022 status
= usb_remote_wakeup(udev
);
3026 status
= -ENODEV
; /* Don't resuscitate */
3028 usb_unlock_device(udev
);
3031 clear_bit(port1
, hub
->change_bits
);
3036 /* Disconnect any existing devices under this port */
3038 usb_disconnect(&hdev
->children
[port1
-1]);
3039 clear_bit(port1
, hub
->change_bits
);
3041 /* We can forget about a "removed" device when there's a physical
3042 * disconnect or the connect status changes.
3044 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
3045 (portchange
& USB_PORT_STAT_C_CONNECTION
))
3046 clear_bit(port1
, hub
->removed_bits
);
3048 if (portchange
& (USB_PORT_STAT_C_CONNECTION
|
3049 USB_PORT_STAT_C_ENABLE
)) {
3050 status
= hub_port_debounce(hub
, port1
);
3052 if (printk_ratelimit())
3053 dev_err(hub_dev
, "connect-debounce failed, "
3054 "port %d disabled\n", port1
);
3055 portstatus
&= ~USB_PORT_STAT_CONNECTION
;
3057 portstatus
= status
;
3061 /* Return now if debouncing failed or nothing is connected or
3062 * the device was "removed".
3064 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
3065 test_bit(port1
, hub
->removed_bits
)) {
3067 /* maybe switch power back on (e.g. root hub was reset) */
3068 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
3069 && !(portstatus
& USB_PORT_STAT_POWER
))
3070 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
3072 if (portstatus
& USB_PORT_STAT_ENABLE
)
3077 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
3079 /* reallocate for each attempt, since references
3080 * to the previous one can escape in various ways
3082 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
3085 "couldn't allocate port %d usb_device\n",
3090 usb_set_device_state(udev
, USB_STATE_POWERED
);
3091 udev
->bus_mA
= hub
->mA_per_port
;
3092 udev
->level
= hdev
->level
+ 1;
3093 udev
->wusb
= hub_is_wusb(hub
);
3096 * USB 3.0 devices are reset automatically before the connect
3097 * port status change appears, and the root hub port status
3098 * shows the correct speed. We also get port change
3099 * notifications for USB 3.0 devices from the USB 3.0 portion of
3100 * an external USB 3.0 hub, but this isn't handled correctly yet
3104 if (!(hcd
->driver
->flags
& HCD_USB3
))
3105 udev
->speed
= USB_SPEED_UNKNOWN
;
3106 else if ((hdev
->parent
== NULL
) &&
3107 (portstatus
& USB_PORT_STAT_SUPER_SPEED
))
3108 udev
->speed
= USB_SPEED_SUPER
;
3110 udev
->speed
= USB_SPEED_UNKNOWN
;
3114 * Note xHCI needs to issue an address device command later
3115 * in the hub_port_init sequence for SS/HS/FS/LS devices,
3116 * and xHC will assign an address to the device. But use
3117 * kernel assigned address here, to avoid any address conflict
3120 choose_address(udev
);
3121 if (udev
->devnum
<= 0) {
3122 status
= -ENOTCONN
; /* Don't retry */
3126 /* reset (non-USB 3.0 devices) and get descriptor */
3127 status
= hub_port_init(hub
, udev
, port1
, i
);
3131 usb_detect_quirks(udev
);
3132 if (udev
->quirks
& USB_QUIRK_DELAY_INIT
)
3135 /* consecutive bus-powered hubs aren't reliable; they can
3136 * violate the voltage drop budget. if the new child has
3137 * a "powered" LED, users should notice we didn't enable it
3138 * (without reading syslog), even without per-port LEDs
3141 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
3142 && udev
->bus_mA
<= 100) {
3145 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
3148 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
3151 le16_to_cpus(&devstat
);
3152 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
3154 "can't connect bus-powered hub "
3156 if (hub
->has_indicators
) {
3157 hub
->indicator
[port1
-1] =
3158 INDICATOR_AMBER_BLINK
;
3159 schedule_delayed_work (&hub
->leds
, 0);
3161 status
= -ENOTCONN
; /* Don't retry */
3166 /* check for devices running slower than they could */
3167 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
3168 && udev
->speed
== USB_SPEED_FULL
3169 && highspeed_hubs
!= 0)
3170 check_highspeed (hub
, udev
, port1
);
3172 /* Store the parent's children[] pointer. At this point
3173 * udev becomes globally accessible, although presumably
3174 * no one will look at it until hdev is unlocked.
3178 /* We mustn't add new devices if the parent hub has
3179 * been disconnected; we would race with the
3180 * recursively_mark_NOTATTACHED() routine.
3182 spin_lock_irq(&device_state_lock
);
3183 if (hdev
->state
== USB_STATE_NOTATTACHED
)
3186 hdev
->children
[port1
-1] = udev
;
3187 spin_unlock_irq(&device_state_lock
);
3189 /* Run it through the hoops (find a driver, etc) */
3191 status
= usb_new_device(udev
);
3193 spin_lock_irq(&device_state_lock
);
3194 hdev
->children
[port1
-1] = NULL
;
3195 spin_unlock_irq(&device_state_lock
);
3202 status
= hub_power_remaining(hub
);
3204 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
3209 hub_port_disable(hub
, port1
, 1);
3211 usb_ep0_reinit(udev
);
3212 release_address(udev
);
3215 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
3218 if (hub
->hdev
->parent
||
3219 !hcd
->driver
->port_handed_over
||
3220 !(hcd
->driver
->port_handed_over
)(hcd
, port1
))
3221 dev_err(hub_dev
, "unable to enumerate USB device on port %d\n",
3225 hub_port_disable(hub
, port1
, 1);
3226 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
3227 hcd
->driver
->relinquish_port(hcd
, port1
);
3230 static void hub_events(void)
3232 struct list_head
*tmp
;
3233 struct usb_device
*hdev
;
3234 struct usb_interface
*intf
;
3235 struct usb_hub
*hub
;
3236 struct device
*hub_dev
;
3245 * We restart the list every time to avoid a deadlock with
3246 * deleting hubs downstream from this one. This should be
3247 * safe since we delete the hub from the event list.
3248 * Not the most efficient, but avoids deadlocks.
3252 /* Grab the first entry at the beginning of the list */
3253 spin_lock_irq(&hub_event_lock
);
3254 if (list_empty(&hub_event_list
)) {
3255 spin_unlock_irq(&hub_event_lock
);
3259 tmp
= hub_event_list
.next
;
3262 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
3263 kref_get(&hub
->kref
);
3264 spin_unlock_irq(&hub_event_lock
);
3267 hub_dev
= hub
->intfdev
;
3268 intf
= to_usb_interface(hub_dev
);
3269 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
3270 hdev
->state
, hub
->descriptor
3271 ? hub
->descriptor
->bNbrPorts
3273 /* NOTE: expects max 15 ports... */
3274 (u16
) hub
->change_bits
[0],
3275 (u16
) hub
->event_bits
[0]);
3277 /* Lock the device, then check to see if we were
3278 * disconnected while waiting for the lock to succeed. */
3279 usb_lock_device(hdev
);
3280 if (unlikely(hub
->disconnected
))
3281 goto loop_disconnected
;
3283 /* If the hub has died, clean up after it */
3284 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
3285 hub
->error
= -ENODEV
;
3286 hub_quiesce(hub
, HUB_DISCONNECT
);
3291 ret
= usb_autopm_get_interface(intf
);
3293 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
3297 /* If this is an inactive hub, do nothing */
3302 dev_dbg (hub_dev
, "resetting for error %d\n",
3305 ret
= usb_reset_device(hdev
);
3308 "error resetting hub: %d\n", ret
);
3316 /* deal with port status changes */
3317 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
3318 if (test_bit(i
, hub
->busy_bits
))
3320 connect_change
= test_bit(i
, hub
->change_bits
);
3321 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
3325 ret
= hub_port_status(hub
, i
,
3326 &portstatus
, &portchange
);
3330 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
3331 clear_port_feature(hdev
, i
,
3332 USB_PORT_FEAT_C_CONNECTION
);
3336 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
3337 if (!connect_change
)
3339 "port %d enable change, "
3342 clear_port_feature(hdev
, i
,
3343 USB_PORT_FEAT_C_ENABLE
);
3346 * EM interference sometimes causes badly
3347 * shielded USB devices to be shutdown by
3348 * the hub, this hack enables them again.
3349 * Works at least with mouse driver.
3351 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
3353 && hdev
->children
[i
-1]) {
3356 "disabled by hub (EMI?), "
3363 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
3364 struct usb_device
*udev
;
3366 clear_port_feature(hdev
, i
,
3367 USB_PORT_FEAT_C_SUSPEND
);
3368 udev
= hdev
->children
[i
-1];
3370 /* TRSMRCY = 10 msec */
3373 usb_lock_device(udev
);
3374 ret
= usb_remote_wakeup(hdev
->
3376 usb_unlock_device(udev
);
3381 hub_port_disable(hub
, i
, 1);
3384 "resume on port %d, status %d\n",
3388 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
3390 "over-current change on port %d\n",
3392 clear_port_feature(hdev
, i
,
3393 USB_PORT_FEAT_C_OVER_CURRENT
);
3394 hub_power_on(hub
, true);
3397 if (portchange
& USB_PORT_STAT_C_RESET
) {
3399 "reset change on port %d\n",
3401 clear_port_feature(hdev
, i
,
3402 USB_PORT_FEAT_C_RESET
);
3406 hub_port_connect_change(hub
, i
,
3407 portstatus
, portchange
);
3410 /* deal with hub status changes */
3411 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
3413 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
3414 dev_err (hub_dev
, "get_hub_status failed\n");
3416 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
3417 dev_dbg (hub_dev
, "power change\n");
3418 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
3419 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
3420 /* FIXME: Is this always true? */
3421 hub
->limited_power
= 1;
3423 hub
->limited_power
= 0;
3425 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
3426 dev_dbg (hub_dev
, "overcurrent change\n");
3427 msleep(500); /* Cool down */
3428 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
3429 hub_power_on(hub
, true);
3434 /* Balance the usb_autopm_get_interface() above */
3435 usb_autopm_put_interface_no_suspend(intf
);
3437 /* Balance the usb_autopm_get_interface_no_resume() in
3438 * kick_khubd() and allow autosuspend.
3440 usb_autopm_put_interface(intf
);
3442 usb_unlock_device(hdev
);
3443 kref_put(&hub
->kref
, hub_release
);
3445 } /* end while (1) */
3448 static int hub_thread(void *__unused
)
3450 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3451 * port handover. Otherwise it might see that a full-speed device
3452 * was gone before the EHCI controller had handed its port over to
3453 * the companion full-speed controller.
3459 wait_event_freezable(khubd_wait
,
3460 !list_empty(&hub_event_list
) ||
3461 kthread_should_stop());
3462 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
3464 pr_debug("%s: khubd exiting\n", usbcore_name
);
3468 static const struct usb_device_id hub_id_table
[] = {
3469 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
3470 .bDeviceClass
= USB_CLASS_HUB
},
3471 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
3472 .bInterfaceClass
= USB_CLASS_HUB
},
3473 { } /* Terminating entry */
3476 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
3478 static struct usb_driver hub_driver
= {
3481 .disconnect
= hub_disconnect
,
3482 .suspend
= hub_suspend
,
3483 .resume
= hub_resume
,
3484 .reset_resume
= hub_reset_resume
,
3485 .pre_reset
= hub_pre_reset
,
3486 .post_reset
= hub_post_reset
,
3487 .unlocked_ioctl
= hub_ioctl
,
3488 .id_table
= hub_id_table
,
3489 .supports_autosuspend
= 1,
3492 int usb_hub_init(void)
3494 if (usb_register(&hub_driver
) < 0) {
3495 printk(KERN_ERR
"%s: can't register hub driver\n",
3500 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
3501 if (!IS_ERR(khubd_task
))
3504 /* Fall through if kernel_thread failed */
3505 usb_deregister(&hub_driver
);
3506 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
3511 void usb_hub_cleanup(void)
3513 kthread_stop(khubd_task
);
3516 * Hub resources are freed for us by usb_deregister. It calls
3517 * usb_driver_purge on every device which in turn calls that
3518 * devices disconnect function if it is using this driver.
3519 * The hub_disconnect function takes care of releasing the
3520 * individual hub resources. -greg
3522 usb_deregister(&hub_driver
);
3523 } /* usb_hub_cleanup() */
3525 static int descriptors_changed(struct usb_device
*udev
,
3526 struct usb_device_descriptor
*old_device_descriptor
)
3530 unsigned serial_len
= 0;
3532 unsigned old_length
;
3536 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
3537 sizeof(*old_device_descriptor
)) != 0)
3540 /* Since the idVendor, idProduct, and bcdDevice values in the
3541 * device descriptor haven't changed, we will assume the
3542 * Manufacturer and Product strings haven't changed either.
3543 * But the SerialNumber string could be different (e.g., a
3544 * different flash card of the same brand).
3547 serial_len
= strlen(udev
->serial
) + 1;
3550 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3551 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3552 len
= max(len
, old_length
);
3555 buf
= kmalloc(len
, GFP_NOIO
);
3557 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
3558 /* assume the worst */
3561 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3562 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3563 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
3565 if (length
!= old_length
) {
3566 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
3571 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
3573 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
3575 ((struct usb_config_descriptor
*) buf
)->
3576 bConfigurationValue
);
3582 if (!changed
&& serial_len
) {
3583 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
3585 if (length
+ 1 != serial_len
) {
3586 dev_dbg(&udev
->dev
, "serial string error %d\n",
3589 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
3590 dev_dbg(&udev
->dev
, "serial string changed\n");
3600 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
3601 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3603 * WARNING - don't use this routine to reset a composite device
3604 * (one with multiple interfaces owned by separate drivers)!
3605 * Use usb_reset_device() instead.
3607 * Do a port reset, reassign the device's address, and establish its
3608 * former operating configuration. If the reset fails, or the device's
3609 * descriptors change from their values before the reset, or the original
3610 * configuration and altsettings cannot be restored, a flag will be set
3611 * telling khubd to pretend the device has been disconnected and then
3612 * re-connected. All drivers will be unbound, and the device will be
3613 * re-enumerated and probed all over again.
3615 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3616 * flagged for logical disconnection, or some other negative error code
3617 * if the reset wasn't even attempted.
3619 * The caller must own the device lock. For example, it's safe to use
3620 * this from a driver probe() routine after downloading new firmware.
3621 * For calls that might not occur during probe(), drivers should lock
3622 * the device using usb_lock_device_for_reset().
3624 * Locking exception: This routine may also be called from within an
3625 * autoresume handler. Such usage won't conflict with other tasks
3626 * holding the device lock because these tasks should always call
3627 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3629 static int usb_reset_and_verify_device(struct usb_device
*udev
)
3631 struct usb_device
*parent_hdev
= udev
->parent
;
3632 struct usb_hub
*parent_hub
;
3633 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3634 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3636 int port1
= udev
->portnum
;
3638 if (udev
->state
== USB_STATE_NOTATTACHED
||
3639 udev
->state
== USB_STATE_SUSPENDED
) {
3640 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3646 /* this requires hcd-specific logic; see ohci_restart() */
3647 dev_dbg(&udev
->dev
, "%s for root hub!\n", __func__
);
3650 parent_hub
= hdev_to_hub(parent_hdev
);
3652 set_bit(port1
, parent_hub
->busy_bits
);
3653 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3655 /* ep0 maxpacket size may change; let the HCD know about it.
3656 * Other endpoints will be handled by re-enumeration. */
3657 usb_ep0_reinit(udev
);
3658 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3659 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
3662 clear_bit(port1
, parent_hub
->busy_bits
);
3667 /* Device might have changed firmware (DFU or similar) */
3668 if (descriptors_changed(udev
, &descriptor
)) {
3669 dev_info(&udev
->dev
, "device firmware changed\n");
3670 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3674 /* Restore the device's previous configuration */
3675 if (!udev
->actconfig
)
3678 mutex_lock(&hcd
->bandwidth_mutex
);
3679 ret
= usb_hcd_alloc_bandwidth(udev
, udev
->actconfig
, NULL
, NULL
);
3681 dev_warn(&udev
->dev
,
3682 "Busted HC? Not enough HCD resources for "
3683 "old configuration.\n");
3684 mutex_unlock(&hcd
->bandwidth_mutex
);
3687 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3688 USB_REQ_SET_CONFIGURATION
, 0,
3689 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3690 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3693 "can't restore configuration #%d (error=%d)\n",
3694 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3695 mutex_unlock(&hcd
->bandwidth_mutex
);
3698 mutex_unlock(&hcd
->bandwidth_mutex
);
3699 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3701 /* Put interfaces back into the same altsettings as before.
3702 * Don't bother to send the Set-Interface request for interfaces
3703 * that were already in altsetting 0; besides being unnecessary,
3704 * many devices can't handle it. Instead just reset the host-side
3707 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3708 struct usb_host_config
*config
= udev
->actconfig
;
3709 struct usb_interface
*intf
= config
->interface
[i
];
3710 struct usb_interface_descriptor
*desc
;
3712 desc
= &intf
->cur_altsetting
->desc
;
3713 if (desc
->bAlternateSetting
== 0) {
3714 usb_disable_interface(udev
, intf
, true);
3715 usb_enable_interface(udev
, intf
, true);
3718 /* Let the bandwidth allocation function know that this
3719 * device has been reset, and it will have to use
3720 * alternate setting 0 as the current alternate setting.
3722 intf
->resetting_device
= 1;
3723 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3724 desc
->bAlternateSetting
);
3725 intf
->resetting_device
= 0;
3728 dev_err(&udev
->dev
, "failed to restore interface %d "
3729 "altsetting %d (error=%d)\n",
3730 desc
->bInterfaceNumber
,
3731 desc
->bAlternateSetting
,
3741 hub_port_logical_disconnect(parent_hub
, port1
);
3746 * usb_reset_device - warn interface drivers and perform a USB port reset
3747 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3749 * Warns all drivers bound to registered interfaces (using their pre_reset
3750 * method), performs the port reset, and then lets the drivers know that
3751 * the reset is over (using their post_reset method).
3753 * Return value is the same as for usb_reset_and_verify_device().
3755 * The caller must own the device lock. For example, it's safe to use
3756 * this from a driver probe() routine after downloading new firmware.
3757 * For calls that might not occur during probe(), drivers should lock
3758 * the device using usb_lock_device_for_reset().
3760 * If an interface is currently being probed or disconnected, we assume
3761 * its driver knows how to handle resets. For all other interfaces,
3762 * if the driver doesn't have pre_reset and post_reset methods then
3763 * we attempt to unbind it and rebind afterward.
3765 int usb_reset_device(struct usb_device
*udev
)
3769 struct usb_host_config
*config
= udev
->actconfig
;
3771 if (udev
->state
== USB_STATE_NOTATTACHED
||
3772 udev
->state
== USB_STATE_SUSPENDED
) {
3773 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3778 /* Prevent autosuspend during the reset */
3779 usb_autoresume_device(udev
);
3782 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3783 struct usb_interface
*cintf
= config
->interface
[i
];
3784 struct usb_driver
*drv
;
3787 if (cintf
->dev
.driver
) {
3788 drv
= to_usb_driver(cintf
->dev
.driver
);
3789 if (drv
->pre_reset
&& drv
->post_reset
)
3790 unbind
= (drv
->pre_reset
)(cintf
);
3791 else if (cintf
->condition
==
3792 USB_INTERFACE_BOUND
)
3795 usb_forced_unbind_intf(cintf
);
3800 ret
= usb_reset_and_verify_device(udev
);
3803 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3804 struct usb_interface
*cintf
= config
->interface
[i
];
3805 struct usb_driver
*drv
;
3806 int rebind
= cintf
->needs_binding
;
3808 if (!rebind
&& cintf
->dev
.driver
) {
3809 drv
= to_usb_driver(cintf
->dev
.driver
);
3810 if (drv
->post_reset
)
3811 rebind
= (drv
->post_reset
)(cintf
);
3812 else if (cintf
->condition
==
3813 USB_INTERFACE_BOUND
)
3816 if (ret
== 0 && rebind
)
3817 usb_rebind_intf(cintf
);
3821 usb_autosuspend_device(udev
);
3824 EXPORT_SYMBOL_GPL(usb_reset_device
);
3828 * usb_queue_reset_device - Reset a USB device from an atomic context
3829 * @iface: USB interface belonging to the device to reset
3831 * This function can be used to reset a USB device from an atomic
3832 * context, where usb_reset_device() won't work (as it blocks).
3834 * Doing a reset via this method is functionally equivalent to calling
3835 * usb_reset_device(), except for the fact that it is delayed to a
3836 * workqueue. This means that any drivers bound to other interfaces
3837 * might be unbound, as well as users from usbfs in user space.
3841 * - Scheduling two resets at the same time from two different drivers
3842 * attached to two different interfaces of the same device is
3843 * possible; depending on how the driver attached to each interface
3844 * handles ->pre_reset(), the second reset might happen or not.
3846 * - If a driver is unbound and it had a pending reset, the reset will
3849 * - This function can be called during .probe() or .disconnect()
3850 * times. On return from .disconnect(), any pending resets will be
3853 * There is no no need to lock/unlock the @reset_ws as schedule_work()
3856 * NOTE: We don't do any reference count tracking because it is not
3857 * needed. The lifecycle of the work_struct is tied to the
3858 * usb_interface. Before destroying the interface we cancel the
3859 * work_struct, so the fact that work_struct is queued and or
3860 * running means the interface (and thus, the device) exist and
3863 void usb_queue_reset_device(struct usb_interface
*iface
)
3865 schedule_work(&iface
->reset_ws
);
3867 EXPORT_SYMBOL_GPL(usb_queue_reset_device
);