4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/kthread.h>
23 #include <linux/mutex.h>
24 #include <linux/freezer.h>
26 #include <asm/semaphore.h>
27 #include <asm/uaccess.h>
28 #include <asm/byteorder.h>
34 #ifdef CONFIG_USB_PERSIST
40 /* if we are in debug mode, always announce new devices */
42 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
43 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
48 struct device
*intfdev
; /* the "interface" device */
49 struct usb_device
*hdev
;
51 struct urb
*urb
; /* for interrupt polling pipe */
53 /* buffer for urb ... with extra space in case of babble */
55 dma_addr_t buffer_dma
; /* DMA address for buffer */
57 struct usb_hub_status hub
;
58 struct usb_port_status port
;
59 } *status
; /* buffer for status reports */
60 struct mutex status_mutex
; /* for the status buffer */
62 int error
; /* last reported error */
63 int nerrors
; /* track consecutive errors */
65 struct list_head event_list
; /* hubs w/data or errs ready */
66 unsigned long event_bits
[1]; /* status change bitmask */
67 unsigned long change_bits
[1]; /* ports with logical connect
69 unsigned long busy_bits
[1]; /* ports being reset or
71 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
72 #error event_bits[] is too short!
75 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
76 struct usb_tt tt
; /* Transaction Translator */
78 unsigned mA_per_port
; /* current for each child */
80 unsigned limited_power
:1;
82 unsigned activating
:1;
83 unsigned disconnected
:1;
85 unsigned has_indicators
:1;
86 u8 indicator
[USB_MAXCHILDREN
];
87 struct delayed_work leds
;
91 /* Protect struct usb_device->state and ->children members
92 * Note: Both are also protected by ->dev.sem, except that ->state can
93 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
94 static DEFINE_SPINLOCK(device_state_lock
);
96 /* khubd's worklist and its lock */
97 static DEFINE_SPINLOCK(hub_event_lock
);
98 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
101 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
103 static struct task_struct
*khubd_task
;
105 /* cycle leds on hubs that aren't blinking for attention */
106 static int blinkenlights
= 0;
107 module_param (blinkenlights
, bool, S_IRUGO
);
108 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
111 * As of 2.6.10 we introduce a new USB device initialization scheme which
112 * closely resembles the way Windows works. Hopefully it will be compatible
113 * with a wider range of devices than the old scheme. However some previously
114 * working devices may start giving rise to "device not accepting address"
115 * errors; if that happens the user can try the old scheme by adjusting the
116 * following module parameters.
118 * For maximum flexibility there are two boolean parameters to control the
119 * hub driver's behavior. On the first initialization attempt, if the
120 * "old_scheme_first" parameter is set then the old scheme will be used,
121 * otherwise the new scheme is used. If that fails and "use_both_schemes"
122 * is set, then the driver will make another attempt, using the other scheme.
124 static int old_scheme_first
= 0;
125 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
126 MODULE_PARM_DESC(old_scheme_first
,
127 "start with the old device initialization scheme");
129 static int use_both_schemes
= 1;
130 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
131 MODULE_PARM_DESC(use_both_schemes
,
132 "try the other device initialization scheme if the "
135 /* Mutual exclusion for EHCI CF initialization. This interferes with
136 * port reset on some companion controllers.
138 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
139 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
142 static inline char *portspeed(int portstatus
)
144 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
146 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
152 /* Note that hdev or one of its children must be locked! */
153 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
155 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
158 /* USB 2.0 spec Section 11.24.4.5 */
159 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
163 for (i
= 0; i
< 3; i
++) {
164 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
165 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
166 USB_DT_HUB
<< 8, 0, data
, size
,
167 USB_CTRL_GET_TIMEOUT
);
168 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
175 * USB 2.0 spec Section 11.24.2.1
177 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
179 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
180 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
184 * USB 2.0 spec Section 11.24.2.2
186 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
188 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
189 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
194 * USB 2.0 spec Section 11.24.2.13
196 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
198 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
199 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
204 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
205 * for info about using port indicators
207 static void set_port_led(
213 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
214 USB_PORT_FEAT_INDICATOR
);
216 dev_dbg (hub
->intfdev
,
217 "port %d indicator %s status %d\n",
219 ({ char *s
; switch (selector
) {
220 case HUB_LED_AMBER
: s
= "amber"; break;
221 case HUB_LED_GREEN
: s
= "green"; break;
222 case HUB_LED_OFF
: s
= "off"; break;
223 case HUB_LED_AUTO
: s
= "auto"; break;
224 default: s
= "??"; break;
229 #define LED_CYCLE_PERIOD ((2*HZ)/3)
231 static void led_work (struct work_struct
*work
)
233 struct usb_hub
*hub
=
234 container_of(work
, struct usb_hub
, leds
.work
);
235 struct usb_device
*hdev
= hub
->hdev
;
237 unsigned changed
= 0;
240 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
243 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
244 unsigned selector
, mode
;
246 /* 30%-50% duty cycle */
248 switch (hub
->indicator
[i
]) {
250 case INDICATOR_CYCLE
:
252 selector
= HUB_LED_AUTO
;
253 mode
= INDICATOR_AUTO
;
255 /* blinking green = sw attention */
256 case INDICATOR_GREEN_BLINK
:
257 selector
= HUB_LED_GREEN
;
258 mode
= INDICATOR_GREEN_BLINK_OFF
;
260 case INDICATOR_GREEN_BLINK_OFF
:
261 selector
= HUB_LED_OFF
;
262 mode
= INDICATOR_GREEN_BLINK
;
264 /* blinking amber = hw attention */
265 case INDICATOR_AMBER_BLINK
:
266 selector
= HUB_LED_AMBER
;
267 mode
= INDICATOR_AMBER_BLINK_OFF
;
269 case INDICATOR_AMBER_BLINK_OFF
:
270 selector
= HUB_LED_OFF
;
271 mode
= INDICATOR_AMBER_BLINK
;
273 /* blink green/amber = reserved */
274 case INDICATOR_ALT_BLINK
:
275 selector
= HUB_LED_GREEN
;
276 mode
= INDICATOR_ALT_BLINK_OFF
;
278 case INDICATOR_ALT_BLINK_OFF
:
279 selector
= HUB_LED_AMBER
;
280 mode
= INDICATOR_ALT_BLINK
;
285 if (selector
!= HUB_LED_AUTO
)
287 set_port_led(hub
, i
+ 1, selector
);
288 hub
->indicator
[i
] = mode
;
290 if (!changed
&& blinkenlights
) {
292 cursor
%= hub
->descriptor
->bNbrPorts
;
293 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
294 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
298 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
301 /* use a short timeout for hub/port status fetches */
302 #define USB_STS_TIMEOUT 1000
303 #define USB_STS_RETRIES 5
306 * USB 2.0 spec Section 11.24.2.6
308 static int get_hub_status(struct usb_device
*hdev
,
309 struct usb_hub_status
*data
)
311 int i
, status
= -ETIMEDOUT
;
313 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
314 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
315 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
316 data
, sizeof(*data
), USB_STS_TIMEOUT
);
322 * USB 2.0 spec Section 11.24.2.7
324 static int get_port_status(struct usb_device
*hdev
, int port1
,
325 struct usb_port_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_PORT
, 0, port1
,
332 data
, sizeof(*data
), USB_STS_TIMEOUT
);
337 static void kick_khubd(struct usb_hub
*hub
)
341 /* Suppress autosuspend until khubd runs */
342 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
344 spin_lock_irqsave(&hub_event_lock
, flags
);
345 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
346 list_add_tail(&hub
->event_list
, &hub_event_list
);
347 wake_up(&khubd_wait
);
349 spin_unlock_irqrestore(&hub_event_lock
, flags
);
352 void usb_kick_khubd(struct usb_device
*hdev
)
354 /* FIXME: What if hdev isn't bound to the hub driver? */
355 kick_khubd(hdev_to_hub(hdev
));
359 /* completion function, fires on port status changes and various faults */
360 static void hub_irq(struct urb
*urb
)
362 struct usb_hub
*hub
= urb
->context
;
363 int status
= urb
->status
;
368 case -ENOENT
: /* synchronous unlink */
369 case -ECONNRESET
: /* async unlink */
370 case -ESHUTDOWN
: /* hardware going away */
373 default: /* presumably an error */
374 /* Cause a hub reset after 10 consecutive errors */
375 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
376 if ((++hub
->nerrors
< 10) || hub
->error
)
381 /* let khubd handle things */
382 case 0: /* we got data: port status changed */
384 for (i
= 0; i
< urb
->actual_length
; ++i
)
385 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
387 hub
->event_bits
[0] = bits
;
393 /* Something happened, let khubd figure it out */
400 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
401 && status
!= -ENODEV
&& status
!= -EPERM
)
402 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
405 /* USB 2.0 spec Section 11.24.2.3 */
407 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
409 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
410 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
415 * enumeration blocks khubd for a long time. we use keventd instead, since
416 * long blocking there is the exception, not the rule. accordingly, HCDs
417 * talking to TTs must queue control transfers (not just bulk and iso), so
418 * both can talk to the same hub concurrently.
420 static void hub_tt_kevent (struct work_struct
*work
)
422 struct usb_hub
*hub
=
423 container_of(work
, struct usb_hub
, tt
.kevent
);
427 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
428 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
429 struct list_head
*temp
;
430 struct usb_tt_clear
*clear
;
431 struct usb_device
*hdev
= hub
->hdev
;
434 temp
= hub
->tt
.clear_list
.next
;
435 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
436 list_del (&clear
->clear_list
);
438 /* drop lock so HCD can concurrently report other TT errors */
439 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
440 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
441 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
445 "clear tt %d (%04x) error %d\n",
446 clear
->tt
, clear
->devinfo
, status
);
449 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
453 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
454 * @udev: the device whose split transaction failed
455 * @pipe: identifies the endpoint of the failed transaction
457 * High speed HCDs use this to tell the hub driver that some split control or
458 * bulk transaction failed in a way that requires clearing internal state of
459 * a transaction translator. This is normally detected (and reported) from
462 * It may not be possible for that hub to handle additional full (or low)
463 * speed transactions until that state is fully cleared out.
465 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
467 struct usb_tt
*tt
= udev
->tt
;
469 struct usb_tt_clear
*clear
;
471 /* we've got to cope with an arbitrary number of pending TT clears,
472 * since each TT has "at least two" buffers that can need it (and
473 * there can be many TTs per hub). even if they're uncommon.
475 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
476 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
477 /* FIXME recover somehow ... RESET_TT? */
481 /* info that CLEAR_TT_BUFFER needs */
482 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
483 clear
->devinfo
= usb_pipeendpoint (pipe
);
484 clear
->devinfo
|= udev
->devnum
<< 4;
485 clear
->devinfo
|= usb_pipecontrol (pipe
)
486 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
487 : (USB_ENDPOINT_XFER_BULK
<< 11);
488 if (usb_pipein (pipe
))
489 clear
->devinfo
|= 1 << 15;
491 /* tell keventd to clear state for this TT */
492 spin_lock_irqsave (&tt
->lock
, flags
);
493 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
494 schedule_work (&tt
->kevent
);
495 spin_unlock_irqrestore (&tt
->lock
, flags
);
498 static void hub_power_on(struct usb_hub
*hub
)
501 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
502 u16 wHubCharacteristics
=
503 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
505 /* Enable power on each port. Some hubs have reserved values
506 * of LPSM (> 2) in their descriptors, even though they are
507 * USB 2.0 hubs. Some hubs do not implement port-power switching
508 * but only emulate it. In all cases, the ports won't work
509 * unless we send these messages to the hub.
511 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
512 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
514 dev_dbg(hub
->intfdev
, "trying to enable port power on "
515 "non-switchable hub\n");
516 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
517 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
519 /* Wait at least 100 msec for power to become stable */
520 msleep(max(pgood_delay
, (unsigned) 100));
523 static void hub_quiesce(struct usb_hub
*hub
)
525 /* (nonblocking) khubd and related activity won't re-trigger */
529 /* (blocking) stop khubd and related activity */
530 usb_kill_urb(hub
->urb
);
531 if (hub
->has_indicators
)
532 cancel_delayed_work_sync(&hub
->leds
);
534 cancel_work_sync(&hub
->tt
.kevent
);
537 static void hub_activate(struct usb_hub
*hub
)
544 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
546 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
547 if (hub
->has_indicators
&& blinkenlights
)
548 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
550 /* scan all ports ASAP */
554 static int hub_hub_status(struct usb_hub
*hub
,
555 u16
*status
, u16
*change
)
559 mutex_lock(&hub
->status_mutex
);
560 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
562 dev_err (hub
->intfdev
,
563 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
565 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
566 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
569 mutex_unlock(&hub
->status_mutex
);
573 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
575 struct usb_device
*hdev
= hub
->hdev
;
578 if (hdev
->children
[port1
-1] && set_state
)
579 usb_set_device_state(hdev
->children
[port1
-1],
580 USB_STATE_NOTATTACHED
);
582 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
584 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
590 * Disable a port and mark a logical connnect-change event, so that some
591 * time later khubd will disconnect() any existing usb_device on the port
592 * and will re-enumerate if there actually is a device attached.
594 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
596 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
597 hub_port_disable(hub
, port1
, 1);
599 /* FIXME let caller ask to power down the port:
600 * - some devices won't enumerate without a VBUS power cycle
601 * - SRP saves power that way
602 * - ... new call, TBD ...
603 * That's easy if this hub can switch power per-port, and
604 * khubd reactivates the port later (timer, SRP, etc).
605 * Powerdown must be optional, because of reset/DFU.
608 set_bit(port1
, hub
->change_bits
);
612 /* caller has locked the hub device */
613 static int hub_pre_reset(struct usb_interface
*intf
)
615 struct usb_hub
*hub
= usb_get_intfdata(intf
);
616 struct usb_device
*hdev
= hub
->hdev
;
619 /* Disconnect all the children */
620 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
621 if (hdev
->children
[i
])
622 usb_disconnect(&hdev
->children
[i
]);
628 /* caller has locked the hub device */
629 static int hub_post_reset(struct usb_interface
*intf
)
631 struct usb_hub
*hub
= usb_get_intfdata(intf
);
638 static int hub_configure(struct usb_hub
*hub
,
639 struct usb_endpoint_descriptor
*endpoint
)
641 struct usb_device
*hdev
= hub
->hdev
;
642 struct device
*hub_dev
= hub
->intfdev
;
643 u16 hubstatus
, hubchange
;
644 u16 wHubCharacteristics
;
649 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
652 message
= "can't allocate hub irq buffer";
657 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
659 message
= "can't kmalloc hub status buffer";
663 mutex_init(&hub
->status_mutex
);
665 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
666 if (!hub
->descriptor
) {
667 message
= "can't kmalloc hub descriptor";
672 /* Request the entire hub descriptor.
673 * hub->descriptor can handle USB_MAXCHILDREN ports,
674 * but the hub can/will return fewer bytes here.
676 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
677 sizeof(*hub
->descriptor
));
679 message
= "can't read hub descriptor";
681 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
682 message
= "hub has too many ports!";
687 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
688 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
689 (hdev
->maxchild
== 1) ? "" : "s");
691 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
693 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
695 char portstr
[USB_MAXCHILDREN
+ 1];
697 for (i
= 0; i
< hdev
->maxchild
; i
++)
698 portstr
[i
] = hub
->descriptor
->DeviceRemovable
699 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
701 portstr
[hdev
->maxchild
] = 0;
702 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
704 dev_dbg(hub_dev
, "standalone hub\n");
706 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
708 dev_dbg(hub_dev
, "ganged power switching\n");
711 dev_dbg(hub_dev
, "individual port power switching\n");
715 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
719 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
721 dev_dbg(hub_dev
, "global over-current protection\n");
724 dev_dbg(hub_dev
, "individual port over-current protection\n");
728 dev_dbg(hub_dev
, "no over-current protection\n");
732 spin_lock_init (&hub
->tt
.lock
);
733 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
734 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
);
735 switch (hdev
->descriptor
.bDeviceProtocol
) {
739 dev_dbg(hub_dev
, "Single TT\n");
743 ret
= usb_set_interface(hdev
, 0, 1);
745 dev_dbg(hub_dev
, "TT per port\n");
748 dev_err(hub_dev
, "Using single TT (err %d)\n",
753 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
754 hdev
->descriptor
.bDeviceProtocol
);
758 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
759 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
760 case HUB_TTTT_8_BITS
:
761 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
762 hub
->tt
.think_time
= 666;
763 dev_dbg(hub_dev
, "TT requires at most %d "
764 "FS bit times (%d ns)\n",
765 8, hub
->tt
.think_time
);
768 case HUB_TTTT_16_BITS
:
769 hub
->tt
.think_time
= 666 * 2;
770 dev_dbg(hub_dev
, "TT requires at most %d "
771 "FS bit times (%d ns)\n",
772 16, hub
->tt
.think_time
);
774 case HUB_TTTT_24_BITS
:
775 hub
->tt
.think_time
= 666 * 3;
776 dev_dbg(hub_dev
, "TT requires at most %d "
777 "FS bit times (%d ns)\n",
778 24, hub
->tt
.think_time
);
780 case HUB_TTTT_32_BITS
:
781 hub
->tt
.think_time
= 666 * 4;
782 dev_dbg(hub_dev
, "TT requires at most %d "
783 "FS bit times (%d ns)\n",
784 32, hub
->tt
.think_time
);
788 /* probe() zeroes hub->indicator[] */
789 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
790 hub
->has_indicators
= 1;
791 dev_dbg(hub_dev
, "Port indicators are supported\n");
794 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
795 hub
->descriptor
->bPwrOn2PwrGood
* 2);
797 /* power budgeting mostly matters with bus-powered hubs,
798 * and battery-powered root hubs (may provide just 8 mA).
800 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
802 message
= "can't get hub status";
805 le16_to_cpus(&hubstatus
);
806 if (hdev
== hdev
->bus
->root_hub
) {
807 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
808 hub
->mA_per_port
= 500;
810 hub
->mA_per_port
= hdev
->bus_mA
;
811 hub
->limited_power
= 1;
813 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
814 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
815 hub
->descriptor
->bHubContrCurrent
);
816 hub
->limited_power
= 1;
817 if (hdev
->maxchild
> 0) {
818 int remaining
= hdev
->bus_mA
-
819 hub
->descriptor
->bHubContrCurrent
;
821 if (remaining
< hdev
->maxchild
* 100)
823 "insufficient power available "
824 "to use all downstream ports\n");
825 hub
->mA_per_port
= 100; /* 7.2.1.1 */
827 } else { /* Self-powered external hub */
828 /* FIXME: What about battery-powered external hubs that
829 * provide less current per port? */
830 hub
->mA_per_port
= 500;
832 if (hub
->mA_per_port
< 500)
833 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
836 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
838 message
= "can't get hub status";
842 /* local power status reports aren't always correct */
843 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
844 dev_dbg(hub_dev
, "local power source is %s\n",
845 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
846 ? "lost (inactive)" : "good");
848 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
849 dev_dbg(hub_dev
, "%sover-current condition exists\n",
850 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
852 /* set up the interrupt endpoint
853 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
854 * bytes as USB2.0[11.12.3] says because some hubs are known
855 * to send more data (and thus cause overflow). For root hubs,
856 * maxpktsize is defined in hcd.c's fake endpoint descriptors
857 * to be big enough for at least USB_MAXCHILDREN ports. */
858 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
859 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
861 if (maxp
> sizeof(*hub
->buffer
))
862 maxp
= sizeof(*hub
->buffer
);
864 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
866 message
= "couldn't allocate interrupt urb";
871 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
872 hub
, endpoint
->bInterval
);
873 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
874 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
876 /* maybe cycle the hub leds */
877 if (hub
->has_indicators
&& blinkenlights
)
878 hub
->indicator
[0] = INDICATOR_CYCLE
;
885 dev_err (hub_dev
, "config failed, %s (err %d)\n",
887 /* hub_disconnect() frees urb and descriptor */
891 static void hub_release(struct kref
*kref
)
893 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
895 usb_put_intf(to_usb_interface(hub
->intfdev
));
899 static unsigned highspeed_hubs
;
901 static void hub_disconnect(struct usb_interface
*intf
)
903 struct usb_hub
*hub
= usb_get_intfdata (intf
);
905 /* Take the hub off the event list and don't let it be added again */
906 spin_lock_irq(&hub_event_lock
);
907 list_del_init(&hub
->event_list
);
908 hub
->disconnected
= 1;
909 spin_unlock_irq(&hub_event_lock
);
911 /* Disconnect all children and quiesce the hub */
915 usb_set_intfdata (intf
, NULL
);
917 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
920 usb_free_urb(hub
->urb
);
921 kfree(hub
->descriptor
);
923 usb_buffer_free(hub
->hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
926 kref_put(&hub
->kref
, hub_release
);
929 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
931 struct usb_host_interface
*desc
;
932 struct usb_endpoint_descriptor
*endpoint
;
933 struct usb_device
*hdev
;
936 desc
= intf
->cur_altsetting
;
937 hdev
= interface_to_usbdev(intf
);
939 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
941 dev_warn(&intf
->dev
, "ignoring external hub\n");
946 /* Some hubs have a subclass of 1, which AFAICT according to the */
947 /* specs is not defined, but it works */
948 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
949 (desc
->desc
.bInterfaceSubClass
!= 1)) {
951 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
955 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
956 if (desc
->desc
.bNumEndpoints
!= 1)
957 goto descriptor_error
;
959 endpoint
= &desc
->endpoint
[0].desc
;
961 /* If it's not an interrupt in endpoint, we'd better punt! */
962 if (!usb_endpoint_is_int_in(endpoint
))
963 goto descriptor_error
;
966 dev_info (&intf
->dev
, "USB hub found\n");
968 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
970 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
974 kref_init(&hub
->kref
);
975 INIT_LIST_HEAD(&hub
->event_list
);
976 hub
->intfdev
= &intf
->dev
;
978 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
981 usb_set_intfdata (intf
, hub
);
982 intf
->needs_remote_wakeup
= 1;
984 if (hdev
->speed
== USB_SPEED_HIGH
)
987 if (hub_configure(hub
, endpoint
) >= 0)
990 hub_disconnect (intf
);
995 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
997 struct usb_device
*hdev
= interface_to_usbdev (intf
);
999 /* assert ifno == 0 (part of hub spec) */
1001 case USBDEVFS_HUB_PORTINFO
: {
1002 struct usbdevfs_hub_portinfo
*info
= user_data
;
1005 spin_lock_irq(&device_state_lock
);
1006 if (hdev
->devnum
<= 0)
1009 info
->nports
= hdev
->maxchild
;
1010 for (i
= 0; i
< info
->nports
; i
++) {
1011 if (hdev
->children
[i
] == NULL
)
1015 hdev
->children
[i
]->devnum
;
1018 spin_unlock_irq(&device_state_lock
);
1020 return info
->nports
+ 1;
1029 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1033 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1034 if (udev
->children
[i
])
1035 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1037 if (udev
->state
== USB_STATE_SUSPENDED
)
1038 udev
->discon_suspended
= 1;
1039 udev
->state
= USB_STATE_NOTATTACHED
;
1043 * usb_set_device_state - change a device's current state (usbcore, hcds)
1044 * @udev: pointer to device whose state should be changed
1045 * @new_state: new state value to be stored
1047 * udev->state is _not_ fully protected by the device lock. Although
1048 * most transitions are made only while holding the lock, the state can
1049 * can change to USB_STATE_NOTATTACHED at almost any time. This
1050 * is so that devices can be marked as disconnected as soon as possible,
1051 * without having to wait for any semaphores to be released. As a result,
1052 * all changes to any device's state must be protected by the
1053 * device_state_lock spinlock.
1055 * Once a device has been added to the device tree, all changes to its state
1056 * should be made using this routine. The state should _not_ be set directly.
1058 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1059 * Otherwise udev->state is set to new_state, and if new_state is
1060 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1061 * to USB_STATE_NOTATTACHED.
1063 void usb_set_device_state(struct usb_device
*udev
,
1064 enum usb_device_state new_state
)
1066 unsigned long flags
;
1068 spin_lock_irqsave(&device_state_lock
, flags
);
1069 if (udev
->state
== USB_STATE_NOTATTACHED
)
1071 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1073 /* root hub wakeup capabilities are managed out-of-band
1074 * and may involve silicon errata ... ignore them here.
1077 if (udev
->state
== USB_STATE_SUSPENDED
1078 || new_state
== USB_STATE_SUSPENDED
)
1079 ; /* No change to wakeup settings */
1080 else if (new_state
== USB_STATE_CONFIGURED
)
1081 device_init_wakeup(&udev
->dev
,
1082 (udev
->actconfig
->desc
.bmAttributes
1083 & USB_CONFIG_ATT_WAKEUP
));
1085 device_init_wakeup(&udev
->dev
, 0);
1087 udev
->state
= new_state
;
1089 recursively_mark_NOTATTACHED(udev
);
1090 spin_unlock_irqrestore(&device_state_lock
, flags
);
1093 static void choose_address(struct usb_device
*udev
)
1096 struct usb_bus
*bus
= udev
->bus
;
1098 /* If khubd ever becomes multithreaded, this will need a lock */
1100 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1101 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1104 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1106 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1109 set_bit(devnum
, bus
->devmap
.devicemap
);
1110 udev
->devnum
= devnum
;
1114 static void release_address(struct usb_device
*udev
)
1116 if (udev
->devnum
> 0) {
1117 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1122 #ifdef CONFIG_USB_SUSPEND
1124 static void usb_stop_pm(struct usb_device
*udev
)
1126 /* Synchronize with the ksuspend thread to prevent any more
1127 * autosuspend requests from being submitted, and decrement
1128 * the parent's count of unsuspended children.
1131 if (udev
->parent
&& !udev
->discon_suspended
)
1132 usb_autosuspend_device(udev
->parent
);
1133 usb_pm_unlock(udev
);
1135 /* Stop any autosuspend requests already submitted */
1136 cancel_rearming_delayed_work(&udev
->autosuspend
);
1141 static inline void usb_stop_pm(struct usb_device
*udev
)
1147 * usb_disconnect - disconnect a device (usbcore-internal)
1148 * @pdev: pointer to device being disconnected
1149 * Context: !in_interrupt ()
1151 * Something got disconnected. Get rid of it and all of its children.
1153 * If *pdev is a normal device then the parent hub must already be locked.
1154 * If *pdev is a root hub then this routine will acquire the
1155 * usb_bus_list_lock on behalf of the caller.
1157 * Only hub drivers (including virtual root hub drivers for host
1158 * controllers) should ever call this.
1160 * This call is synchronous, and may not be used in an interrupt context.
1162 void usb_disconnect(struct usb_device
**pdev
)
1164 struct usb_device
*udev
= *pdev
;
1168 pr_debug ("%s nodev\n", __FUNCTION__
);
1172 /* mark the device as inactive, so any further urb submissions for
1173 * this device (and any of its children) will fail immediately.
1174 * this quiesces everyting except pending urbs.
1176 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1177 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1179 usb_lock_device(udev
);
1181 /* Free up all the children before we remove this device */
1182 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1183 if (udev
->children
[i
])
1184 usb_disconnect(&udev
->children
[i
]);
1187 /* deallocate hcd/hardware state ... nuking all pending urbs and
1188 * cleaning up all state associated with the current configuration
1189 * so that the hardware is now fully quiesced.
1191 dev_dbg (&udev
->dev
, "unregistering device\n");
1192 usb_disable_device(udev
, 0);
1194 usb_unlock_device(udev
);
1196 /* Unregister the device. The device driver is responsible
1197 * for removing the device files from usbfs and sysfs and for
1198 * de-configuring the device.
1200 device_del(&udev
->dev
);
1202 /* Free the device number and delete the parent's children[]
1203 * (or root_hub) pointer.
1205 release_address(udev
);
1207 /* Avoid races with recursively_mark_NOTATTACHED() */
1208 spin_lock_irq(&device_state_lock
);
1210 spin_unlock_irq(&device_state_lock
);
1214 put_device(&udev
->dev
);
1217 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1218 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1222 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1225 static void announce_device(struct usb_device
*udev
)
1227 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1228 le16_to_cpu(udev
->descriptor
.idVendor
),
1229 le16_to_cpu(udev
->descriptor
.idProduct
));
1230 dev_info(&udev
->dev
, "New USB device strings: Mfr=%d, Product=%d, "
1231 "SerialNumber=%d\n",
1232 udev
->descriptor
.iManufacturer
,
1233 udev
->descriptor
.iProduct
,
1234 udev
->descriptor
.iSerialNumber
);
1235 show_string(udev
, "Product", udev
->product
);
1236 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1237 show_string(udev
, "SerialNumber", udev
->serial
);
1240 static inline void announce_device(struct usb_device
*udev
) { }
1243 #ifdef CONFIG_USB_OTG
1244 #include "otg_whitelist.h"
1248 * usb_configure_device_otg - FIXME (usbcore-internal)
1249 * @udev: newly addressed device (in ADDRESS state)
1251 * Do configuration for On-The-Go devices
1253 static int usb_configure_device_otg(struct usb_device
*udev
)
1257 #ifdef CONFIG_USB_OTG
1259 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1260 * to wake us after we've powered off VBUS; and HNP, switching roles
1261 * "host" to "peripheral". The OTG descriptor helps figure this out.
1263 if (!udev
->bus
->is_b_host
1265 && udev
->parent
== udev
->bus
->root_hub
) {
1266 struct usb_otg_descriptor
*desc
= 0;
1267 struct usb_bus
*bus
= udev
->bus
;
1269 /* descriptor may appear anywhere in config */
1270 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1271 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1272 USB_DT_OTG
, (void **) &desc
) == 0) {
1273 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1274 unsigned port1
= udev
->portnum
;
1276 dev_info(&udev
->dev
,
1277 "Dual-Role OTG device on %sHNP port\n",
1278 (port1
== bus
->otg_port
)
1281 /* enable HNP before suspend, it's simpler */
1282 if (port1
== bus
->otg_port
)
1283 bus
->b_hnp_enable
= 1;
1284 err
= usb_control_msg(udev
,
1285 usb_sndctrlpipe(udev
, 0),
1286 USB_REQ_SET_FEATURE
, 0,
1288 ? USB_DEVICE_B_HNP_ENABLE
1289 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1290 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1292 /* OTG MESSAGE: report errors here,
1293 * customize to match your product.
1295 dev_info(&udev
->dev
,
1296 "can't set HNP mode; %d\n",
1298 bus
->b_hnp_enable
= 0;
1304 if (!is_targeted(udev
)) {
1306 /* Maybe it can talk to us, though we can't talk to it.
1307 * (Includes HNP test device.)
1309 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1310 err
= usb_port_suspend(udev
);
1312 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1324 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1325 * @udev: newly addressed device (in ADDRESS state)
1327 * This is only called by usb_new_device() and usb_authorize_device()
1328 * and FIXME -- all comments that apply to them apply here wrt to
1331 * If the device is WUSB and not authorized, we don't attempt to read
1332 * the string descriptors, as they will be errored out by the device
1333 * until it has been authorized.
1335 static int usb_configure_device(struct usb_device
*udev
)
1339 if (udev
->config
== NULL
) {
1340 err
= usb_get_configuration(udev
);
1342 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1347 if (udev
->wusb
== 1 && udev
->authorized
== 0) {
1348 udev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1349 udev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1350 udev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1353 /* read the standard strings and cache them if present */
1354 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1355 udev
->manufacturer
= usb_cache_string(udev
,
1356 udev
->descriptor
.iManufacturer
);
1357 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1359 err
= usb_configure_device_otg(udev
);
1366 * usb_new_device - perform initial device setup (usbcore-internal)
1367 * @udev: newly addressed device (in ADDRESS state)
1369 * This is called with devices which have been enumerated, but not yet
1370 * configured. The device descriptor is available, but not descriptors
1371 * for any device configuration. The caller must have locked either
1372 * the parent hub (if udev is a normal device) or else the
1373 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1374 * udev has already been installed, but udev is not yet visible through
1375 * sysfs or other filesystem code.
1377 * It will return if the device is configured properly or not. Zero if
1378 * the interface was registered with the driver core; else a negative
1381 * This call is synchronous, and may not be used in an interrupt context.
1383 * Only the hub driver or root-hub registrar should ever call this.
1385 int usb_new_device(struct usb_device
*udev
)
1389 usb_detect_quirks(udev
); /* Determine quirks */
1390 err
= usb_configure_device(udev
); /* detect & probe dev/intfs */
1393 /* export the usbdev device-node for libusb */
1394 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1395 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1397 /* Increment the parent's count of unsuspended children */
1399 usb_autoresume_device(udev
->parent
);
1401 /* Register the device. The device driver is responsible
1402 * for adding the device files to sysfs and for configuring
1405 err
= device_add(&udev
->dev
);
1407 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1411 /* Tell the world! */
1412 announce_device(udev
);
1416 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1422 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1423 * @usb_dev: USB device
1425 * Move the USB device to a very basic state where interfaces are disabled
1426 * and the device is in fact unconfigured and unusable.
1428 * We share a lock (that we have) with device_del(), so we need to
1431 int usb_deauthorize_device(struct usb_device
*usb_dev
)
1434 usb_lock_device(usb_dev
);
1435 if (usb_dev
->authorized
== 0)
1436 goto out_unauthorized
;
1437 usb_dev
->authorized
= 0;
1438 usb_set_configuration(usb_dev
, -1);
1439 usb_dev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1440 usb_dev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1441 usb_dev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1442 kfree(usb_dev
->config
);
1443 usb_dev
->config
= NULL
;
1444 for (cnt
= 0; cnt
< usb_dev
->descriptor
.bNumConfigurations
; cnt
++)
1445 kfree(usb_dev
->rawdescriptors
[cnt
]);
1446 usb_dev
->descriptor
.bNumConfigurations
= 0;
1447 kfree(usb_dev
->rawdescriptors
);
1449 usb_unlock_device(usb_dev
);
1454 int usb_authorize_device(struct usb_device
*usb_dev
)
1457 usb_lock_device(usb_dev
);
1458 if (usb_dev
->authorized
== 1)
1459 goto out_authorized
;
1460 kfree(usb_dev
->product
);
1461 usb_dev
->product
= NULL
;
1462 kfree(usb_dev
->manufacturer
);
1463 usb_dev
->manufacturer
= NULL
;
1464 kfree(usb_dev
->serial
);
1465 usb_dev
->serial
= NULL
;
1466 result
= usb_autoresume_device(usb_dev
);
1468 dev_err(&usb_dev
->dev
,
1469 "can't autoresume for authorization: %d\n", result
);
1470 goto error_autoresume
;
1472 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
1474 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
1475 "authorization: %d\n", result
);
1476 goto error_device_descriptor
;
1478 usb_dev
->authorized
= 1;
1479 result
= usb_configure_device(usb_dev
);
1481 goto error_configure
;
1482 /* Choose and set the configuration. This registers the interfaces
1483 * with the driver core and lets interface drivers bind to them.
1485 c
= usb_choose_configuration(usb_dev
);
1487 result
= usb_set_configuration(usb_dev
, c
);
1489 dev_err(&usb_dev
->dev
,
1490 "can't set config #%d, error %d\n", c
, result
);
1491 /* This need not be fatal. The user can try to
1492 * set other configurations. */
1495 dev_info(&usb_dev
->dev
, "authorized to connect\n");
1497 error_device_descriptor
:
1500 usb_unlock_device(usb_dev
); // complements locktree
1505 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1506 u16
*status
, u16
*change
)
1510 mutex_lock(&hub
->status_mutex
);
1511 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1513 dev_err (hub
->intfdev
,
1514 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1518 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1519 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1522 mutex_unlock(&hub
->status_mutex
);
1527 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1528 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1530 struct usb_hcd
*hcd
;
1531 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1533 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1534 return hcd
->wireless
;
1538 #define PORT_RESET_TRIES 5
1539 #define SET_ADDRESS_TRIES 2
1540 #define GET_DESCRIPTOR_TRIES 2
1541 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1542 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1544 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1545 #define HUB_SHORT_RESET_TIME 10
1546 #define HUB_LONG_RESET_TIME 200
1547 #define HUB_RESET_TIMEOUT 500
1549 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1550 struct usb_device
*udev
, unsigned int delay
)
1552 int delay_time
, ret
;
1556 for (delay_time
= 0;
1557 delay_time
< HUB_RESET_TIMEOUT
;
1558 delay_time
+= delay
) {
1559 /* wait to give the device a chance to reset */
1562 /* read and decode port status */
1563 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1567 /* Device went away? */
1568 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1571 /* bomb out completely if the connection bounced */
1572 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1575 /* if we`ve finished resetting, then break out of the loop */
1576 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1577 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1578 if (hub_is_wusb(hub
))
1579 udev
->speed
= USB_SPEED_VARIABLE
;
1580 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1581 udev
->speed
= USB_SPEED_HIGH
;
1582 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1583 udev
->speed
= USB_SPEED_LOW
;
1585 udev
->speed
= USB_SPEED_FULL
;
1589 /* switch to the long delay after two short delay failures */
1590 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1591 delay
= HUB_LONG_RESET_TIME
;
1593 dev_dbg (hub
->intfdev
,
1594 "port %d not reset yet, waiting %dms\n",
1601 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1602 struct usb_device
*udev
, unsigned int delay
)
1606 /* Block EHCI CF initialization during the port reset.
1607 * Some companion controllers don't like it when they mix.
1609 down_read(&ehci_cf_port_reset_rwsem
);
1611 /* Reset the port */
1612 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1613 status
= set_port_feature(hub
->hdev
,
1614 port1
, USB_PORT_FEAT_RESET
);
1616 dev_err(hub
->intfdev
,
1617 "cannot reset port %d (err = %d)\n",
1620 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1621 if (status
&& status
!= -ENOTCONN
)
1622 dev_dbg(hub
->intfdev
,
1623 "port_wait_reset: err = %d\n",
1627 /* return on disconnect or reset */
1630 /* TRSTRCY = 10 ms; plus some extra */
1632 udev
->devnum
= 0; /* Device now at address 0 */
1636 clear_port_feature(hub
->hdev
,
1637 port1
, USB_PORT_FEAT_C_RESET
);
1638 /* FIXME need disconnect() for NOTATTACHED device */
1639 usb_set_device_state(udev
, status
1640 ? USB_STATE_NOTATTACHED
1641 : USB_STATE_DEFAULT
);
1645 dev_dbg (hub
->intfdev
,
1646 "port %d not enabled, trying reset again...\n",
1648 delay
= HUB_LONG_RESET_TIME
;
1651 dev_err (hub
->intfdev
,
1652 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1656 up_read(&ehci_cf_port_reset_rwsem
);
1662 #ifdef CONFIG_USB_SUSPEND
1665 * usb_port_suspend - suspend a usb device's upstream port
1666 * @udev: device that's no longer in active use, not a root hub
1667 * Context: must be able to sleep; device not locked; pm locks held
1669 * Suspends a USB device that isn't in active use, conserving power.
1670 * Devices may wake out of a suspend, if anything important happens,
1671 * using the remote wakeup mechanism. They may also be taken out of
1672 * suspend by the host, using usb_port_resume(). It's also routine
1673 * to disconnect devices while they are suspended.
1675 * This only affects the USB hardware for a device; its interfaces
1676 * (and, for hubs, child devices) must already have been suspended.
1678 * Selective port suspend reduces power; most suspended devices draw
1679 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1680 * All devices below the suspended port are also suspended.
1682 * Devices leave suspend state when the host wakes them up. Some devices
1683 * also support "remote wakeup", where the device can activate the USB
1684 * tree above them to deliver data, such as a keypress or packet. In
1685 * some cases, this wakes the USB host.
1687 * Suspending OTG devices may trigger HNP, if that's been enabled
1688 * between a pair of dual-role devices. That will change roles, such
1689 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1691 * Devices on USB hub ports have only one "suspend" state, corresponding
1692 * to ACPI D2, "may cause the device to lose some context".
1693 * State transitions include:
1695 * - suspend, resume ... when the VBUS power link stays live
1696 * - suspend, disconnect ... VBUS lost
1698 * Once VBUS drop breaks the circuit, the port it's using has to go through
1699 * normal re-enumeration procedures, starting with enabling VBUS power.
1700 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1701 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1702 * timer, no SRP, no requests through sysfs.
1704 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1705 * the root hub for their bus goes into global suspend ... so we don't
1706 * (falsely) update the device power state to say it suspended.
1708 * Returns 0 on success, else negative errno.
1710 int usb_port_suspend(struct usb_device
*udev
)
1712 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1713 int port1
= udev
->portnum
;
1716 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1718 /* enable remote wakeup when appropriate; this lets the device
1719 * wake up the upstream hub (including maybe the root hub).
1721 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1722 * we don't explicitly enable it here.
1724 if (udev
->do_remote_wakeup
) {
1725 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1726 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1727 USB_DEVICE_REMOTE_WAKEUP
, 0,
1729 USB_CTRL_SET_TIMEOUT
);
1731 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
1736 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1738 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
1740 /* paranoia: "should not happen" */
1741 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1742 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1743 USB_DEVICE_REMOTE_WAKEUP
, 0,
1745 USB_CTRL_SET_TIMEOUT
);
1747 /* device has up to 10 msec to fully suspend */
1748 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1749 udev
->auto_pm
? "auto-" : "");
1750 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1757 * If the USB "suspend" state is in use (rather than "global suspend"),
1758 * many devices will be individually taken out of suspend state using
1759 * special "resume" signaling. This routine kicks in shortly after
1760 * hardware resume signaling is finished, either because of selective
1761 * resume (by host) or remote wakeup (by device) ... now see what changed
1762 * in the tree that's rooted at this device.
1764 * If @udev->reset_resume is set then the device is reset before the
1765 * status check is done.
1767 static int finish_port_resume(struct usb_device
*udev
)
1772 /* caller owns the udev device lock */
1773 dev_dbg(&udev
->dev
, "finish %sresume\n",
1774 udev
->reset_resume
? "reset-" : "");
1776 /* usb ch9 identifies four variants of SUSPENDED, based on what
1777 * state the device resumes to. Linux currently won't see the
1778 * first two on the host side; they'd be inside hub_port_init()
1779 * during many timeouts, but khubd can't suspend until later.
1781 usb_set_device_state(udev
, udev
->actconfig
1782 ? USB_STATE_CONFIGURED
1783 : USB_STATE_ADDRESS
);
1785 /* 10.5.4.5 says not to reset a suspended port if the attached
1786 * device is enabled for remote wakeup. Hence the reset
1787 * operation is carried out here, after the port has been
1790 if (udev
->reset_resume
)
1791 status
= usb_reset_device(udev
);
1793 /* 10.5.4.5 says be sure devices in the tree are still there.
1794 * For now let's assume the device didn't go crazy on resume,
1795 * and device drivers will know about any resume quirks.
1799 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1801 status
= (status
> 0 ? 0 : -ENODEV
);
1805 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
1807 } else if (udev
->actconfig
) {
1808 le16_to_cpus(&devstatus
);
1809 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
1810 status
= usb_control_msg(udev
,
1811 usb_sndctrlpipe(udev
, 0),
1812 USB_REQ_CLEAR_FEATURE
,
1814 USB_DEVICE_REMOTE_WAKEUP
, 0,
1816 USB_CTRL_SET_TIMEOUT
);
1818 dev_dbg(&udev
->dev
, "disable remote "
1819 "wakeup, status %d\n", status
);
1827 * usb_port_resume - re-activate a suspended usb device's upstream port
1828 * @udev: device to re-activate, not a root hub
1829 * Context: must be able to sleep; device not locked; pm locks held
1831 * This will re-activate the suspended device, increasing power usage
1832 * while letting drivers communicate again with its endpoints.
1833 * USB resume explicitly guarantees that the power session between
1834 * the host and the device is the same as it was when the device
1837 * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this
1838 * routine won't check that the port is still enabled. Furthermore,
1839 * if @udev->reset_resume is set then finish_port_resume() above will
1840 * reset @udev. The end result is that a broken power session can be
1841 * recovered and @udev will appear to persist across a loss of VBUS power.
1843 * For example, if a host controller doesn't maintain VBUS suspend current
1844 * during a system sleep or is reset when the system wakes up, all the USB
1845 * power sessions below it will be broken. This is especially troublesome
1846 * for mass-storage devices containing mounted filesystems, since the
1847 * device will appear to have disconnected and all the memory mappings
1848 * to it will be lost. Using the USB_PERSIST facility, the device can be
1849 * made to appear as if it had not disconnected.
1851 * This facility is inherently dangerous. Although usb_reset_device()
1852 * makes every effort to insure that the same device is present after the
1853 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
1854 * quite possible for a device to remain unaltered but its media to be
1855 * changed. If the user replaces a flash memory card while the system is
1856 * asleep, he will have only himself to blame when the filesystem on the
1857 * new card is corrupted and the system crashes.
1859 * Returns 0 on success, else negative errno.
1861 int usb_port_resume(struct usb_device
*udev
)
1863 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1864 int port1
= udev
->portnum
;
1866 u16 portchange
, portstatus
;
1867 unsigned mask_flags
, want_flags
;
1869 /* Skip the initial Clear-Suspend step for a remote wakeup */
1870 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1871 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
1872 goto SuspendCleared
;
1874 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1876 set_bit(port1
, hub
->busy_bits
);
1878 /* see 7.1.7.7; affects power usage, but not budgeting */
1879 status
= clear_port_feature(hub
->hdev
,
1880 port1
, USB_PORT_FEAT_SUSPEND
);
1882 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
1885 /* drive resume for at least 20 msec */
1886 dev_dbg(&udev
->dev
, "usb %sresume\n",
1887 udev
->auto_pm
? "auto-" : "");
1890 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1891 * stop resume signaling. Then finish the resume
1894 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1897 if (USB_PERSIST
&& udev
->reset_resume
)
1898 want_flags
= USB_PORT_STAT_POWER
1899 | USB_PORT_STAT_CONNECTION
;
1901 want_flags
= USB_PORT_STAT_POWER
1902 | USB_PORT_STAT_CONNECTION
1903 | USB_PORT_STAT_ENABLE
;
1904 mask_flags
= want_flags
| USB_PORT_STAT_SUSPEND
;
1906 if (status
< 0 || (portstatus
& mask_flags
) != want_flags
) {
1907 dev_dbg(hub
->intfdev
,
1908 "port %d status %04x.%04x after resume, %d\n",
1909 port1
, portchange
, portstatus
, status
);
1913 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1914 clear_port_feature(hub
->hdev
, port1
,
1915 USB_PORT_FEAT_C_SUSPEND
);
1916 /* TRSMRCY = 10 msec */
1921 clear_bit(port1
, hub
->busy_bits
);
1922 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
1923 usb_enable_root_hub_irq(hub
->hdev
->bus
);
1926 status
= finish_port_resume(udev
);
1928 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
1929 hub_port_logical_disconnect(hub
, port1
);
1934 static int remote_wakeup(struct usb_device
*udev
)
1938 usb_lock_device(udev
);
1939 if (udev
->state
== USB_STATE_SUSPENDED
) {
1940 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
1941 usb_mark_last_busy(udev
);
1942 status
= usb_external_resume_device(udev
);
1944 usb_unlock_device(udev
);
1948 #else /* CONFIG_USB_SUSPEND */
1950 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1952 int usb_port_suspend(struct usb_device
*udev
)
1957 int usb_port_resume(struct usb_device
*udev
)
1961 /* However we may need to do a reset-resume */
1962 if (udev
->reset_resume
) {
1963 dev_dbg(&udev
->dev
, "reset-resume\n");
1964 status
= usb_reset_device(udev
);
1969 static inline int remote_wakeup(struct usb_device
*udev
)
1976 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1978 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1979 struct usb_device
*hdev
= hub
->hdev
;
1982 /* fail if children aren't already suspended */
1983 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1984 struct usb_device
*udev
;
1986 udev
= hdev
->children
[port1
-1];
1987 if (udev
&& udev
->can_submit
) {
1989 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
1995 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
1997 /* stop khubd and related activity */
2002 static int hub_resume(struct usb_interface
*intf
)
2004 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2006 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
2008 /* tell khubd to look for changes on this hub */
2013 static int hub_reset_resume(struct usb_interface
*intf
)
2015 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2016 struct usb_device
*hdev
= hub
->hdev
;
2021 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2022 struct usb_device
*child
= hdev
->children
[port1
-1];
2026 /* For "USB_PERSIST"-enabled children we must
2027 * mark the child device for reset-resume and
2028 * turn off the connect-change status to prevent
2029 * khubd from disconnecting it later.
2031 if (USB_PERSIST
&& child
->persist_enabled
) {
2032 child
->reset_resume
= 1;
2033 clear_port_feature(hdev
, port1
,
2034 USB_PORT_FEAT_C_CONNECTION
);
2036 /* Otherwise we must disconnect the child,
2037 * but as we may not lock the child device here
2038 * we have to do a "logical" disconnect.
2041 hub_port_logical_disconnect(hub
, port1
);
2051 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2052 * @rhdev: struct usb_device for the root hub
2054 * The USB host controller driver calls this function when its root hub
2055 * is resumed and Vbus power has been interrupted or the controller
2056 * has been reset. The routine marks @rhdev as having lost power. When
2057 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
2058 * is enabled then it will carry out power-session recovery, otherwise
2059 * it will disconnect all the child devices.
2061 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
2063 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
2064 rhdev
->reset_resume
= 1;
2066 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
2068 #else /* CONFIG_PM */
2070 static inline int remote_wakeup(struct usb_device
*udev
)
2075 #define hub_suspend NULL
2076 #define hub_resume NULL
2077 #define hub_reset_resume NULL
2081 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2083 * Between connect detection and reset signaling there must be a delay
2084 * of 100ms at least for debounce and power-settling. The corresponding
2085 * timer shall restart whenever the downstream port detects a disconnect.
2087 * Apparently there are some bluetooth and irda-dongles and a number of
2088 * low-speed devices for which this debounce period may last over a second.
2089 * Not covered by the spec - but easy to deal with.
2091 * This implementation uses a 1500ms total debounce timeout; if the
2092 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2093 * every 25ms for transient disconnects. When the port status has been
2094 * unchanged for 100ms it returns the port status.
2097 #define HUB_DEBOUNCE_TIMEOUT 1500
2098 #define HUB_DEBOUNCE_STEP 25
2099 #define HUB_DEBOUNCE_STABLE 100
2101 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2104 int total_time
, stable_time
= 0;
2105 u16 portchange
, portstatus
;
2106 unsigned connection
= 0xffff;
2108 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2109 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2113 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2114 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2115 stable_time
+= HUB_DEBOUNCE_STEP
;
2116 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2120 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2123 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2124 clear_port_feature(hub
->hdev
, port1
,
2125 USB_PORT_FEAT_C_CONNECTION
);
2128 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2130 msleep(HUB_DEBOUNCE_STEP
);
2133 dev_dbg (hub
->intfdev
,
2134 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2135 port1
, total_time
, stable_time
, portstatus
);
2137 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2142 static void ep0_reinit(struct usb_device
*udev
)
2144 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2145 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2146 usb_enable_endpoint(udev
, &udev
->ep0
);
2149 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2150 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2152 static int hub_set_address(struct usb_device
*udev
, int devnum
)
2158 if (udev
->state
== USB_STATE_ADDRESS
)
2160 if (udev
->state
!= USB_STATE_DEFAULT
)
2162 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2163 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
2164 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2166 udev
->devnum
= devnum
; /* Device now using proper address */
2167 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2173 /* Reset device, (re)assign address, get device descriptor.
2174 * Device connection must be stable, no more debouncing needed.
2175 * Returns device in USB_STATE_ADDRESS, except on error.
2177 * If this is called for an already-existing device (as part of
2178 * usb_reset_device), the caller must own the device lock. For a
2179 * newly detected device that is not accessible through any global
2180 * pointers, it's not necessary to lock the device.
2183 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2186 static DEFINE_MUTEX(usb_address0_mutex
);
2188 struct usb_device
*hdev
= hub
->hdev
;
2190 unsigned delay
= HUB_SHORT_RESET_TIME
;
2191 enum usb_device_speed oldspeed
= udev
->speed
;
2193 int devnum
= udev
->devnum
;
2195 /* root hub ports have a slightly longer reset period
2196 * (from USB 2.0 spec, section 7.1.7.5)
2198 if (!hdev
->parent
) {
2199 delay
= HUB_ROOT_RESET_TIME
;
2200 if (port1
== hdev
->bus
->otg_port
)
2201 hdev
->bus
->b_hnp_enable
= 0;
2204 /* Some low speed devices have problems with the quick delay, so */
2205 /* be a bit pessimistic with those devices. RHbug #23670 */
2206 if (oldspeed
== USB_SPEED_LOW
)
2207 delay
= HUB_LONG_RESET_TIME
;
2209 mutex_lock(&usb_address0_mutex
);
2211 /* Reset the device; full speed may morph to high speed */
2212 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2213 if (retval
< 0) /* error or disconnect */
2215 /* success, speed is known */
2218 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2219 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2222 oldspeed
= udev
->speed
;
2224 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2225 * it's fixed size except for full speed devices.
2226 * For Wireless USB devices, ep0 max packet is always 512 (tho
2227 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2229 switch (udev
->speed
) {
2230 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2231 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2233 case USB_SPEED_HIGH
: /* fixed at 64 */
2234 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2236 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2237 /* to determine the ep0 maxpacket size, try to read
2238 * the device descriptor to get bMaxPacketSize0 and
2239 * then correct our initial guess.
2241 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2243 case USB_SPEED_LOW
: /* fixed at 8 */
2244 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2251 switch (udev
->speed
) {
2252 case USB_SPEED_LOW
: speed
= "low"; break;
2253 case USB_SPEED_FULL
: speed
= "full"; break;
2254 case USB_SPEED_HIGH
: speed
= "high"; break;
2255 case USB_SPEED_VARIABLE
:
2259 default: speed
= "?"; break;
2261 dev_info (&udev
->dev
,
2262 "%s %s speed %sUSB device using %s and address %d\n",
2263 (udev
->config
) ? "reset" : "new", speed
, type
,
2264 udev
->bus
->controller
->driver
->name
, devnum
);
2266 /* Set up TT records, if needed */
2268 udev
->tt
= hdev
->tt
;
2269 udev
->ttport
= hdev
->ttport
;
2270 } else if (udev
->speed
!= USB_SPEED_HIGH
2271 && hdev
->speed
== USB_SPEED_HIGH
) {
2272 udev
->tt
= &hub
->tt
;
2273 udev
->ttport
= port1
;
2276 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2277 * Because device hardware and firmware is sometimes buggy in
2278 * this area, and this is how Linux has done it for ages.
2279 * Change it cautiously.
2281 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2282 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2283 * so it may help with some non-standards-compliant devices.
2284 * Otherwise we start with SET_ADDRESS and then try to read the
2285 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2288 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2289 if (USE_NEW_SCHEME(retry_counter
)) {
2290 struct usb_device_descriptor
*buf
;
2293 #define GET_DESCRIPTOR_BUFSIZE 64
2294 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2300 /* Retry on all errors; some devices are flakey.
2301 * 255 is for WUSB devices, we actually need to use
2302 * 512 (WUSB1.0[4.8.1]).
2304 for (j
= 0; j
< 3; ++j
) {
2305 buf
->bMaxPacketSize0
= 0;
2306 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2307 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2308 USB_DT_DEVICE
<< 8, 0,
2309 buf
, GET_DESCRIPTOR_BUFSIZE
,
2310 USB_CTRL_GET_TIMEOUT
);
2311 switch (buf
->bMaxPacketSize0
) {
2312 case 8: case 16: case 32: case 64: case 255:
2313 if (buf
->bDescriptorType
==
2327 udev
->descriptor
.bMaxPacketSize0
=
2328 buf
->bMaxPacketSize0
;
2331 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2332 if (retval
< 0) /* error or disconnect */
2334 if (oldspeed
!= udev
->speed
) {
2336 "device reset changed speed!\n");
2341 dev_err(&udev
->dev
, "device descriptor "
2342 "read/%s, error %d\n",
2347 #undef GET_DESCRIPTOR_BUFSIZE
2350 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2351 retval
= hub_set_address(udev
, devnum
);
2358 "device not accepting address %d, error %d\n",
2363 /* cope with hardware quirkiness:
2364 * - let SET_ADDRESS settle, some device hardware wants it
2365 * - read ep0 maxpacket even for high and low speed,
2368 if (USE_NEW_SCHEME(retry_counter
))
2371 retval
= usb_get_device_descriptor(udev
, 8);
2373 dev_err(&udev
->dev
, "device descriptor "
2374 "read/%s, error %d\n",
2386 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2387 512 : udev
->descriptor
.bMaxPacketSize0
;
2388 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2389 if (udev
->speed
!= USB_SPEED_FULL
||
2390 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2391 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2395 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2396 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2400 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2401 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2402 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2413 hub_port_disable(hub
, port1
, 0);
2414 udev
->devnum
= devnum
; /* for disconnect processing */
2416 mutex_unlock(&usb_address0_mutex
);
2421 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2423 struct usb_qualifier_descriptor
*qual
;
2426 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2430 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2431 qual
, sizeof *qual
);
2432 if (status
== sizeof *qual
) {
2433 dev_info(&udev
->dev
, "not running at top speed; "
2434 "connect to a high speed hub\n");
2435 /* hub LEDs are probably harder to miss than syslog */
2436 if (hub
->has_indicators
) {
2437 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2438 schedule_delayed_work (&hub
->leds
, 0);
2445 hub_power_remaining (struct usb_hub
*hub
)
2447 struct usb_device
*hdev
= hub
->hdev
;
2451 if (!hub
->limited_power
)
2454 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2455 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2456 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2462 /* Unconfigured devices may not use more than 100mA,
2463 * or 8mA for OTG ports */
2464 if (udev
->actconfig
)
2465 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2466 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2470 if (delta
> hub
->mA_per_port
)
2471 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2473 delta
, hub
->mA_per_port
, port1
);
2476 if (remaining
< 0) {
2477 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2484 /* Handle physical or logical connection change events.
2485 * This routine is called when:
2486 * a port connection-change occurs;
2487 * a port enable-change occurs (often caused by EMI);
2488 * usb_reset_device() encounters changed descriptors (as from
2489 * a firmware download)
2490 * caller already locked the hub
2492 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2493 u16 portstatus
, u16 portchange
)
2495 struct usb_device
*hdev
= hub
->hdev
;
2496 struct device
*hub_dev
= hub
->intfdev
;
2497 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2498 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2502 "port %d, status %04x, change %04x, %s\n",
2503 port1
, portstatus
, portchange
, portspeed (portstatus
));
2505 if (hub
->has_indicators
) {
2506 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2507 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2510 /* Disconnect any existing devices under this port */
2511 if (hdev
->children
[port1
-1])
2512 usb_disconnect(&hdev
->children
[port1
-1]);
2513 clear_bit(port1
, hub
->change_bits
);
2515 #ifdef CONFIG_USB_OTG
2516 /* during HNP, don't repeat the debounce */
2517 if (hdev
->bus
->is_b_host
)
2518 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2521 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2522 status
= hub_port_debounce(hub
, port1
);
2524 if (printk_ratelimit())
2525 dev_err (hub_dev
, "connect-debounce failed, "
2526 "port %d disabled\n", port1
);
2529 portstatus
= status
;
2532 /* Return now if nothing is connected */
2533 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2535 /* maybe switch power back on (e.g. root hub was reset) */
2536 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2537 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2538 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2540 if (portstatus
& USB_PORT_STAT_ENABLE
)
2545 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2546 struct usb_device
*udev
;
2548 /* reallocate for each attempt, since references
2549 * to the previous one can escape in various ways
2551 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2554 "couldn't allocate port %d usb_device\n",
2559 usb_set_device_state(udev
, USB_STATE_POWERED
);
2560 udev
->speed
= USB_SPEED_UNKNOWN
;
2561 udev
->bus_mA
= hub
->mA_per_port
;
2562 udev
->level
= hdev
->level
+ 1;
2564 /* set the address */
2565 choose_address(udev
);
2566 if (udev
->devnum
<= 0) {
2567 status
= -ENOTCONN
; /* Don't retry */
2571 /* reset and get descriptor */
2572 status
= hub_port_init(hub
, udev
, port1
, i
);
2576 /* consecutive bus-powered hubs aren't reliable; they can
2577 * violate the voltage drop budget. if the new child has
2578 * a "powered" LED, users should notice we didn't enable it
2579 * (without reading syslog), even without per-port LEDs
2582 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2583 && udev
->bus_mA
<= 100) {
2586 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2589 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2592 le16_to_cpus(&devstat
);
2593 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2595 "can't connect bus-powered hub "
2597 if (hub
->has_indicators
) {
2598 hub
->indicator
[port1
-1] =
2599 INDICATOR_AMBER_BLINK
;
2600 schedule_delayed_work (&hub
->leds
, 0);
2602 status
= -ENOTCONN
; /* Don't retry */
2607 /* check for devices running slower than they could */
2608 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2609 && udev
->speed
== USB_SPEED_FULL
2610 && highspeed_hubs
!= 0)
2611 check_highspeed (hub
, udev
, port1
);
2613 /* Store the parent's children[] pointer. At this point
2614 * udev becomes globally accessible, although presumably
2615 * no one will look at it until hdev is unlocked.
2619 /* We mustn't add new devices if the parent hub has
2620 * been disconnected; we would race with the
2621 * recursively_mark_NOTATTACHED() routine.
2623 spin_lock_irq(&device_state_lock
);
2624 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2627 hdev
->children
[port1
-1] = udev
;
2628 spin_unlock_irq(&device_state_lock
);
2630 /* Run it through the hoops (find a driver, etc) */
2632 status
= usb_new_device(udev
);
2634 spin_lock_irq(&device_state_lock
);
2635 hdev
->children
[port1
-1] = NULL
;
2636 spin_unlock_irq(&device_state_lock
);
2643 status
= hub_power_remaining(hub
);
2645 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2650 hub_port_disable(hub
, port1
, 1);
2653 release_address(udev
);
2655 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
2660 hub_port_disable(hub
, port1
, 1);
2661 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
2662 hcd
->driver
->relinquish_port(hcd
, port1
);
2665 static void hub_events(void)
2667 struct list_head
*tmp
;
2668 struct usb_device
*hdev
;
2669 struct usb_interface
*intf
;
2670 struct usb_hub
*hub
;
2671 struct device
*hub_dev
;
2680 * We restart the list every time to avoid a deadlock with
2681 * deleting hubs downstream from this one. This should be
2682 * safe since we delete the hub from the event list.
2683 * Not the most efficient, but avoids deadlocks.
2687 /* Grab the first entry at the beginning of the list */
2688 spin_lock_irq(&hub_event_lock
);
2689 if (list_empty(&hub_event_list
)) {
2690 spin_unlock_irq(&hub_event_lock
);
2694 tmp
= hub_event_list
.next
;
2697 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2698 kref_get(&hub
->kref
);
2699 spin_unlock_irq(&hub_event_lock
);
2702 hub_dev
= hub
->intfdev
;
2703 intf
= to_usb_interface(hub_dev
);
2704 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2705 hdev
->state
, hub
->descriptor
2706 ? hub
->descriptor
->bNbrPorts
2708 /* NOTE: expects max 15 ports... */
2709 (u16
) hub
->change_bits
[0],
2710 (u16
) hub
->event_bits
[0]);
2712 /* Lock the device, then check to see if we were
2713 * disconnected while waiting for the lock to succeed. */
2714 usb_lock_device(hdev
);
2715 if (unlikely(hub
->disconnected
))
2718 /* If the hub has died, clean up after it */
2719 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2720 hub
->error
= -ENODEV
;
2721 hub_pre_reset(intf
);
2726 ret
= usb_autopm_get_interface(intf
);
2728 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2732 /* If this is an inactive hub, do nothing */
2737 dev_dbg (hub_dev
, "resetting for error %d\n",
2740 ret
= usb_reset_composite_device(hdev
, intf
);
2743 "error resetting hub: %d\n", ret
);
2751 /* deal with port status changes */
2752 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2753 if (test_bit(i
, hub
->busy_bits
))
2755 connect_change
= test_bit(i
, hub
->change_bits
);
2756 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2757 !connect_change
&& !hub
->activating
)
2760 ret
= hub_port_status(hub
, i
,
2761 &portstatus
, &portchange
);
2765 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2767 USB_PORT_STAT_CONNECTION
))
2770 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2771 clear_port_feature(hdev
, i
,
2772 USB_PORT_FEAT_C_CONNECTION
);
2776 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2777 if (!connect_change
)
2779 "port %d enable change, "
2782 clear_port_feature(hdev
, i
,
2783 USB_PORT_FEAT_C_ENABLE
);
2786 * EM interference sometimes causes badly
2787 * shielded USB devices to be shutdown by
2788 * the hub, this hack enables them again.
2789 * Works at least with mouse driver.
2791 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2793 && hdev
->children
[i
-1]) {
2796 "disabled by hub (EMI?), "
2803 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2804 clear_port_feature(hdev
, i
,
2805 USB_PORT_FEAT_C_SUSPEND
);
2806 if (hdev
->children
[i
-1]) {
2807 ret
= remote_wakeup(hdev
->
2813 hub_port_disable(hub
, i
, 1);
2816 "resume on port %d, status %d\n",
2820 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2822 "over-current change on port %d\n",
2824 clear_port_feature(hdev
, i
,
2825 USB_PORT_FEAT_C_OVER_CURRENT
);
2829 if (portchange
& USB_PORT_STAT_C_RESET
) {
2831 "reset change on port %d\n",
2833 clear_port_feature(hdev
, i
,
2834 USB_PORT_FEAT_C_RESET
);
2838 hub_port_connect_change(hub
, i
,
2839 portstatus
, portchange
);
2842 /* deal with hub status changes */
2843 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2845 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2846 dev_err (hub_dev
, "get_hub_status failed\n");
2848 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2849 dev_dbg (hub_dev
, "power change\n");
2850 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2851 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2852 /* FIXME: Is this always true? */
2853 hub
->limited_power
= 1;
2855 hub
->limited_power
= 0;
2857 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2858 dev_dbg (hub_dev
, "overcurrent change\n");
2859 msleep(500); /* Cool down */
2860 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2865 hub
->activating
= 0;
2867 /* If this is a root hub, tell the HCD it's okay to
2868 * re-enable port-change interrupts now. */
2869 if (!hdev
->parent
&& !hub
->busy_bits
[0])
2870 usb_enable_root_hub_irq(hdev
->bus
);
2873 /* Allow autosuspend if we're not going to run again */
2874 if (list_empty(&hub
->event_list
))
2875 usb_autopm_enable(intf
);
2877 usb_unlock_device(hdev
);
2878 kref_put(&hub
->kref
, hub_release
);
2880 } /* end while (1) */
2883 static int hub_thread(void *__unused
)
2888 wait_event_freezable(khubd_wait
,
2889 !list_empty(&hub_event_list
) ||
2890 kthread_should_stop());
2891 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2893 pr_debug("%s: khubd exiting\n", usbcore_name
);
2897 static struct usb_device_id hub_id_table
[] = {
2898 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2899 .bDeviceClass
= USB_CLASS_HUB
},
2900 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2901 .bInterfaceClass
= USB_CLASS_HUB
},
2902 { } /* Terminating entry */
2905 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2907 static struct usb_driver hub_driver
= {
2910 .disconnect
= hub_disconnect
,
2911 .suspend
= hub_suspend
,
2912 .resume
= hub_resume
,
2913 .reset_resume
= hub_reset_resume
,
2914 .pre_reset
= hub_pre_reset
,
2915 .post_reset
= hub_post_reset
,
2917 .id_table
= hub_id_table
,
2918 .supports_autosuspend
= 1,
2921 int usb_hub_init(void)
2923 if (usb_register(&hub_driver
) < 0) {
2924 printk(KERN_ERR
"%s: can't register hub driver\n",
2929 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2930 if (!IS_ERR(khubd_task
))
2933 /* Fall through if kernel_thread failed */
2934 usb_deregister(&hub_driver
);
2935 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2940 void usb_hub_cleanup(void)
2942 kthread_stop(khubd_task
);
2945 * Hub resources are freed for us by usb_deregister. It calls
2946 * usb_driver_purge on every device which in turn calls that
2947 * devices disconnect function if it is using this driver.
2948 * The hub_disconnect function takes care of releasing the
2949 * individual hub resources. -greg
2951 usb_deregister(&hub_driver
);
2952 } /* usb_hub_cleanup() */
2954 static int config_descriptors_changed(struct usb_device
*udev
)
2958 struct usb_config_descriptor
*buf
;
2960 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2961 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2962 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2964 buf
= kmalloc(len
, GFP_NOIO
);
2966 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2967 /* assume the worst */
2970 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2972 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2974 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
2976 if (length
< old_length
) {
2977 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
2981 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
2983 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
2984 index
, buf
->bConfigurationValue
);
2989 return index
!= udev
->descriptor
.bNumConfigurations
;
2993 * usb_reset_device - perform a USB port reset to reinitialize a device
2994 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2996 * WARNING - don't use this routine to reset a composite device
2997 * (one with multiple interfaces owned by separate drivers)!
2998 * Use usb_reset_composite_device() instead.
3000 * Do a port reset, reassign the device's address, and establish its
3001 * former operating configuration. If the reset fails, or the device's
3002 * descriptors change from their values before the reset, or the original
3003 * configuration and altsettings cannot be restored, a flag will be set
3004 * telling khubd to pretend the device has been disconnected and then
3005 * re-connected. All drivers will be unbound, and the device will be
3006 * re-enumerated and probed all over again.
3008 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3009 * flagged for logical disconnection, or some other negative error code
3010 * if the reset wasn't even attempted.
3012 * The caller must own the device lock. For example, it's safe to use
3013 * this from a driver probe() routine after downloading new firmware.
3014 * For calls that might not occur during probe(), drivers should lock
3015 * the device using usb_lock_device_for_reset().
3017 * Locking exception: This routine may also be called from within an
3018 * autoresume handler. Such usage won't conflict with other tasks
3019 * holding the device lock because these tasks should always call
3020 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3022 int usb_reset_device(struct usb_device
*udev
)
3024 struct usb_device
*parent_hdev
= udev
->parent
;
3025 struct usb_hub
*parent_hub
;
3026 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3028 int port1
= udev
->portnum
;
3030 if (udev
->state
== USB_STATE_NOTATTACHED
||
3031 udev
->state
== USB_STATE_SUSPENDED
) {
3032 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3038 /* this requires hcd-specific logic; see OHCI hc_restart() */
3039 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
3042 parent_hub
= hdev_to_hub(parent_hdev
);
3044 set_bit(port1
, parent_hub
->busy_bits
);
3045 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3047 /* ep0 maxpacket size may change; let the HCD know about it.
3048 * Other endpoints will be handled by re-enumeration. */
3050 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3051 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
3054 clear_bit(port1
, parent_hub
->busy_bits
);
3055 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
3056 usb_enable_root_hub_irq(parent_hdev
->bus
);
3061 /* Device might have changed firmware (DFU or similar) */
3062 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
3063 || config_descriptors_changed (udev
)) {
3064 dev_info(&udev
->dev
, "device firmware changed\n");
3065 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3069 if (!udev
->actconfig
)
3072 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3073 USB_REQ_SET_CONFIGURATION
, 0,
3074 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3075 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3078 "can't restore configuration #%d (error=%d)\n",
3079 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3082 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3084 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3085 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3086 struct usb_interface_descriptor
*desc
;
3088 /* set_interface resets host side toggle even
3089 * for altsetting zero. the interface may have no driver.
3091 desc
= &intf
->cur_altsetting
->desc
;
3092 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3093 desc
->bAlternateSetting
);
3095 dev_err(&udev
->dev
, "failed to restore interface %d "
3096 "altsetting %d (error=%d)\n",
3097 desc
->bInterfaceNumber
,
3098 desc
->bAlternateSetting
,
3108 hub_port_logical_disconnect(parent_hub
, port1
);
3111 EXPORT_SYMBOL(usb_reset_device
);
3114 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3115 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3116 * @iface: interface bound to the driver making the request (optional)
3118 * Warns all drivers bound to registered interfaces (using their pre_reset
3119 * method), performs the port reset, and then lets the drivers know that
3120 * the reset is over (using their post_reset method).
3122 * Return value is the same as for usb_reset_device().
3124 * The caller must own the device lock. For example, it's safe to use
3125 * this from a driver probe() routine after downloading new firmware.
3126 * For calls that might not occur during probe(), drivers should lock
3127 * the device using usb_lock_device_for_reset().
3129 int usb_reset_composite_device(struct usb_device
*udev
,
3130 struct usb_interface
*iface
)
3134 struct usb_host_config
*config
= udev
->actconfig
;
3136 if (udev
->state
== USB_STATE_NOTATTACHED
||
3137 udev
->state
== USB_STATE_SUSPENDED
) {
3138 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3143 /* Prevent autosuspend during the reset */
3144 usb_autoresume_device(udev
);
3146 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3150 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3151 struct usb_interface
*cintf
= config
->interface
[i
];
3152 struct usb_driver
*drv
;
3154 if (cintf
->dev
.driver
) {
3155 drv
= to_usb_driver(cintf
->dev
.driver
);
3157 (drv
->pre_reset
)(cintf
);
3158 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
3163 ret
= usb_reset_device(udev
);
3166 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3167 struct usb_interface
*cintf
= config
->interface
[i
];
3168 struct usb_driver
*drv
;
3170 if (cintf
->dev
.driver
) {
3171 drv
= to_usb_driver(cintf
->dev
.driver
);
3172 if (drv
->post_reset
)
3173 (drv
->post_reset
)(cintf
);
3174 /* FIXME: Unbind if post_reset returns an error or isn't defined */
3179 usb_autosuspend_device(udev
);
3182 EXPORT_SYMBOL(usb_reset_composite_device
);