4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/kthread.h>
23 #include <linux/mutex.h>
24 #include <linux/freezer.h>
26 #include <asm/uaccess.h>
27 #include <asm/byteorder.h>
33 #ifdef CONFIG_USB_PERSIST
39 /* if we are in debug mode, always announce new devices */
41 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
42 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
47 struct device
*intfdev
; /* the "interface" device */
48 struct usb_device
*hdev
;
50 struct urb
*urb
; /* for interrupt polling pipe */
52 /* buffer for urb ... with extra space in case of babble */
54 dma_addr_t buffer_dma
; /* DMA address for buffer */
56 struct usb_hub_status hub
;
57 struct usb_port_status port
;
58 } *status
; /* buffer for status reports */
59 struct mutex status_mutex
; /* for the status buffer */
61 int error
; /* last reported error */
62 int nerrors
; /* track consecutive errors */
64 struct list_head event_list
; /* hubs w/data or errs ready */
65 unsigned long event_bits
[1]; /* status change bitmask */
66 unsigned long change_bits
[1]; /* ports with logical connect
68 unsigned long busy_bits
[1]; /* ports being reset or
70 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
71 #error event_bits[] is too short!
74 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
75 struct usb_tt tt
; /* Transaction Translator */
77 unsigned mA_per_port
; /* current for each child */
79 unsigned limited_power
:1;
81 unsigned activating
:1;
82 unsigned disconnected
:1;
84 unsigned has_indicators
:1;
85 u8 indicator
[USB_MAXCHILDREN
];
86 struct delayed_work leds
;
90 /* Protect struct usb_device->state and ->children members
91 * Note: Both are also protected by ->dev.sem, except that ->state can
92 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
93 static DEFINE_SPINLOCK(device_state_lock
);
95 /* khubd's worklist and its lock */
96 static DEFINE_SPINLOCK(hub_event_lock
);
97 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
100 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
102 static struct task_struct
*khubd_task
;
104 /* cycle leds on hubs that aren't blinking for attention */
105 static int blinkenlights
= 0;
106 module_param (blinkenlights
, bool, S_IRUGO
);
107 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
110 * As of 2.6.10 we introduce a new USB device initialization scheme which
111 * closely resembles the way Windows works. Hopefully it will be compatible
112 * with a wider range of devices than the old scheme. However some previously
113 * working devices may start giving rise to "device not accepting address"
114 * errors; if that happens the user can try the old scheme by adjusting the
115 * following module parameters.
117 * For maximum flexibility there are two boolean parameters to control the
118 * hub driver's behavior. On the first initialization attempt, if the
119 * "old_scheme_first" parameter is set then the old scheme will be used,
120 * otherwise the new scheme is used. If that fails and "use_both_schemes"
121 * is set, then the driver will make another attempt, using the other scheme.
123 static int old_scheme_first
= 0;
124 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
125 MODULE_PARM_DESC(old_scheme_first
,
126 "start with the old device initialization scheme");
128 static int use_both_schemes
= 1;
129 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
130 MODULE_PARM_DESC(use_both_schemes
,
131 "try the other device initialization scheme if the "
134 /* Mutual exclusion for EHCI CF initialization. This interferes with
135 * port reset on some companion controllers.
137 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
138 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
141 static inline char *portspeed(int portstatus
)
143 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
145 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
151 /* Note that hdev or one of its children must be locked! */
152 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
154 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
157 /* USB 2.0 spec Section 11.24.4.5 */
158 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
162 for (i
= 0; i
< 3; i
++) {
163 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
164 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
165 USB_DT_HUB
<< 8, 0, data
, size
,
166 USB_CTRL_GET_TIMEOUT
);
167 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
174 * USB 2.0 spec Section 11.24.2.1
176 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
178 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
179 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
183 * USB 2.0 spec Section 11.24.2.2
185 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
187 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
188 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
193 * USB 2.0 spec Section 11.24.2.13
195 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
197 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
198 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
203 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
204 * for info about using port indicators
206 static void set_port_led(
212 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
213 USB_PORT_FEAT_INDICATOR
);
215 dev_dbg (hub
->intfdev
,
216 "port %d indicator %s status %d\n",
218 ({ char *s
; switch (selector
) {
219 case HUB_LED_AMBER
: s
= "amber"; break;
220 case HUB_LED_GREEN
: s
= "green"; break;
221 case HUB_LED_OFF
: s
= "off"; break;
222 case HUB_LED_AUTO
: s
= "auto"; break;
223 default: s
= "??"; break;
228 #define LED_CYCLE_PERIOD ((2*HZ)/3)
230 static void led_work (struct work_struct
*work
)
232 struct usb_hub
*hub
=
233 container_of(work
, struct usb_hub
, leds
.work
);
234 struct usb_device
*hdev
= hub
->hdev
;
236 unsigned changed
= 0;
239 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
242 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
243 unsigned selector
, mode
;
245 /* 30%-50% duty cycle */
247 switch (hub
->indicator
[i
]) {
249 case INDICATOR_CYCLE
:
251 selector
= HUB_LED_AUTO
;
252 mode
= INDICATOR_AUTO
;
254 /* blinking green = sw attention */
255 case INDICATOR_GREEN_BLINK
:
256 selector
= HUB_LED_GREEN
;
257 mode
= INDICATOR_GREEN_BLINK_OFF
;
259 case INDICATOR_GREEN_BLINK_OFF
:
260 selector
= HUB_LED_OFF
;
261 mode
= INDICATOR_GREEN_BLINK
;
263 /* blinking amber = hw attention */
264 case INDICATOR_AMBER_BLINK
:
265 selector
= HUB_LED_AMBER
;
266 mode
= INDICATOR_AMBER_BLINK_OFF
;
268 case INDICATOR_AMBER_BLINK_OFF
:
269 selector
= HUB_LED_OFF
;
270 mode
= INDICATOR_AMBER_BLINK
;
272 /* blink green/amber = reserved */
273 case INDICATOR_ALT_BLINK
:
274 selector
= HUB_LED_GREEN
;
275 mode
= INDICATOR_ALT_BLINK_OFF
;
277 case INDICATOR_ALT_BLINK_OFF
:
278 selector
= HUB_LED_AMBER
;
279 mode
= INDICATOR_ALT_BLINK
;
284 if (selector
!= HUB_LED_AUTO
)
286 set_port_led(hub
, i
+ 1, selector
);
287 hub
->indicator
[i
] = mode
;
289 if (!changed
&& blinkenlights
) {
291 cursor
%= hub
->descriptor
->bNbrPorts
;
292 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
293 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
297 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
300 /* use a short timeout for hub/port status fetches */
301 #define USB_STS_TIMEOUT 1000
302 #define USB_STS_RETRIES 5
305 * USB 2.0 spec Section 11.24.2.6
307 static int get_hub_status(struct usb_device
*hdev
,
308 struct usb_hub_status
*data
)
310 int i
, status
= -ETIMEDOUT
;
312 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
313 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
314 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
315 data
, sizeof(*data
), USB_STS_TIMEOUT
);
321 * USB 2.0 spec Section 11.24.2.7
323 static int get_port_status(struct usb_device
*hdev
, int port1
,
324 struct usb_port_status
*data
)
326 int i
, status
= -ETIMEDOUT
;
328 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
329 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
330 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
331 data
, sizeof(*data
), USB_STS_TIMEOUT
);
336 static void kick_khubd(struct usb_hub
*hub
)
340 /* Suppress autosuspend until khubd runs */
341 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
343 spin_lock_irqsave(&hub_event_lock
, flags
);
344 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
345 list_add_tail(&hub
->event_list
, &hub_event_list
);
346 wake_up(&khubd_wait
);
348 spin_unlock_irqrestore(&hub_event_lock
, flags
);
351 void usb_kick_khubd(struct usb_device
*hdev
)
353 /* FIXME: What if hdev isn't bound to the hub driver? */
354 kick_khubd(hdev_to_hub(hdev
));
358 /* completion function, fires on port status changes and various faults */
359 static void hub_irq(struct urb
*urb
)
361 struct usb_hub
*hub
= urb
->context
;
362 int status
= urb
->status
;
367 case -ENOENT
: /* synchronous unlink */
368 case -ECONNRESET
: /* async unlink */
369 case -ESHUTDOWN
: /* hardware going away */
372 default: /* presumably an error */
373 /* Cause a hub reset after 10 consecutive errors */
374 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
375 if ((++hub
->nerrors
< 10) || hub
->error
)
380 /* let khubd handle things */
381 case 0: /* we got data: port status changed */
383 for (i
= 0; i
< urb
->actual_length
; ++i
)
384 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
386 hub
->event_bits
[0] = bits
;
392 /* Something happened, let khubd figure it out */
399 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
400 && status
!= -ENODEV
&& status
!= -EPERM
)
401 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
404 /* USB 2.0 spec Section 11.24.2.3 */
406 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
408 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
409 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
414 * enumeration blocks khubd for a long time. we use keventd instead, since
415 * long blocking there is the exception, not the rule. accordingly, HCDs
416 * talking to TTs must queue control transfers (not just bulk and iso), so
417 * both can talk to the same hub concurrently.
419 static void hub_tt_kevent (struct work_struct
*work
)
421 struct usb_hub
*hub
=
422 container_of(work
, struct usb_hub
, tt
.kevent
);
426 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
427 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
428 struct list_head
*temp
;
429 struct usb_tt_clear
*clear
;
430 struct usb_device
*hdev
= hub
->hdev
;
433 temp
= hub
->tt
.clear_list
.next
;
434 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
435 list_del (&clear
->clear_list
);
437 /* drop lock so HCD can concurrently report other TT errors */
438 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
439 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
440 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
444 "clear tt %d (%04x) error %d\n",
445 clear
->tt
, clear
->devinfo
, status
);
448 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
452 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
453 * @udev: the device whose split transaction failed
454 * @pipe: identifies the endpoint of the failed transaction
456 * High speed HCDs use this to tell the hub driver that some split control or
457 * bulk transaction failed in a way that requires clearing internal state of
458 * a transaction translator. This is normally detected (and reported) from
461 * It may not be possible for that hub to handle additional full (or low)
462 * speed transactions until that state is fully cleared out.
464 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
466 struct usb_tt
*tt
= udev
->tt
;
468 struct usb_tt_clear
*clear
;
470 /* we've got to cope with an arbitrary number of pending TT clears,
471 * since each TT has "at least two" buffers that can need it (and
472 * there can be many TTs per hub). even if they're uncommon.
474 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
475 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
476 /* FIXME recover somehow ... RESET_TT? */
480 /* info that CLEAR_TT_BUFFER needs */
481 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
482 clear
->devinfo
= usb_pipeendpoint (pipe
);
483 clear
->devinfo
|= udev
->devnum
<< 4;
484 clear
->devinfo
|= usb_pipecontrol (pipe
)
485 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
486 : (USB_ENDPOINT_XFER_BULK
<< 11);
487 if (usb_pipein (pipe
))
488 clear
->devinfo
|= 1 << 15;
490 /* tell keventd to clear state for this TT */
491 spin_lock_irqsave (&tt
->lock
, flags
);
492 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
493 schedule_work (&tt
->kevent
);
494 spin_unlock_irqrestore (&tt
->lock
, flags
);
496 EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer
);
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
->active_duration
-= jiffies
;
1041 udev
->state
= USB_STATE_NOTATTACHED
;
1045 * usb_set_device_state - change a device's current state (usbcore, hcds)
1046 * @udev: pointer to device whose state should be changed
1047 * @new_state: new state value to be stored
1049 * udev->state is _not_ fully protected by the device lock. Although
1050 * most transitions are made only while holding the lock, the state can
1051 * can change to USB_STATE_NOTATTACHED at almost any time. This
1052 * is so that devices can be marked as disconnected as soon as possible,
1053 * without having to wait for any semaphores to be released. As a result,
1054 * all changes to any device's state must be protected by the
1055 * device_state_lock spinlock.
1057 * Once a device has been added to the device tree, all changes to its state
1058 * should be made using this routine. The state should _not_ be set directly.
1060 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1061 * Otherwise udev->state is set to new_state, and if new_state is
1062 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1063 * to USB_STATE_NOTATTACHED.
1065 void usb_set_device_state(struct usb_device
*udev
,
1066 enum usb_device_state new_state
)
1068 unsigned long flags
;
1070 spin_lock_irqsave(&device_state_lock
, flags
);
1071 if (udev
->state
== USB_STATE_NOTATTACHED
)
1073 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1075 /* root hub wakeup capabilities are managed out-of-band
1076 * and may involve silicon errata ... ignore them here.
1079 if (udev
->state
== USB_STATE_SUSPENDED
1080 || new_state
== USB_STATE_SUSPENDED
)
1081 ; /* No change to wakeup settings */
1082 else if (new_state
== USB_STATE_CONFIGURED
)
1083 device_init_wakeup(&udev
->dev
,
1084 (udev
->actconfig
->desc
.bmAttributes
1085 & USB_CONFIG_ATT_WAKEUP
));
1087 device_init_wakeup(&udev
->dev
, 0);
1089 if (udev
->state
== USB_STATE_SUSPENDED
&&
1090 new_state
!= USB_STATE_SUSPENDED
)
1091 udev
->active_duration
-= jiffies
;
1092 else if (new_state
== USB_STATE_SUSPENDED
&&
1093 udev
->state
!= USB_STATE_SUSPENDED
)
1094 udev
->active_duration
+= jiffies
;
1095 udev
->state
= new_state
;
1097 recursively_mark_NOTATTACHED(udev
);
1098 spin_unlock_irqrestore(&device_state_lock
, flags
);
1101 static void choose_address(struct usb_device
*udev
)
1104 struct usb_bus
*bus
= udev
->bus
;
1106 /* If khubd ever becomes multithreaded, this will need a lock */
1108 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1109 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1112 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128, 1);
1114 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1117 set_bit(devnum
, bus
->devmap
.devicemap
);
1118 udev
->devnum
= devnum
;
1122 static void release_address(struct usb_device
*udev
)
1124 if (udev
->devnum
> 0) {
1125 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1130 #ifdef CONFIG_USB_SUSPEND
1132 static void usb_stop_pm(struct usb_device
*udev
)
1134 /* Synchronize with the ksuspend thread to prevent any more
1135 * autosuspend requests from being submitted, and decrement
1136 * the parent's count of unsuspended children.
1139 if (udev
->parent
&& !udev
->discon_suspended
)
1140 usb_autosuspend_device(udev
->parent
);
1141 usb_pm_unlock(udev
);
1143 /* Stop any autosuspend requests already submitted */
1144 cancel_rearming_delayed_work(&udev
->autosuspend
);
1149 static inline void usb_stop_pm(struct usb_device
*udev
)
1155 * usb_disconnect - disconnect a device (usbcore-internal)
1156 * @pdev: pointer to device being disconnected
1157 * Context: !in_interrupt ()
1159 * Something got disconnected. Get rid of it and all of its children.
1161 * If *pdev is a normal device then the parent hub must already be locked.
1162 * If *pdev is a root hub then this routine will acquire the
1163 * usb_bus_list_lock on behalf of the caller.
1165 * Only hub drivers (including virtual root hub drivers for host
1166 * controllers) should ever call this.
1168 * This call is synchronous, and may not be used in an interrupt context.
1170 void usb_disconnect(struct usb_device
**pdev
)
1172 struct usb_device
*udev
= *pdev
;
1176 pr_debug ("%s nodev\n", __FUNCTION__
);
1180 /* mark the device as inactive, so any further urb submissions for
1181 * this device (and any of its children) will fail immediately.
1182 * this quiesces everyting except pending urbs.
1184 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1185 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1187 usb_lock_device(udev
);
1189 /* Free up all the children before we remove this device */
1190 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1191 if (udev
->children
[i
])
1192 usb_disconnect(&udev
->children
[i
]);
1195 /* deallocate hcd/hardware state ... nuking all pending urbs and
1196 * cleaning up all state associated with the current configuration
1197 * so that the hardware is now fully quiesced.
1199 dev_dbg (&udev
->dev
, "unregistering device\n");
1200 usb_disable_device(udev
, 0);
1202 usb_unlock_device(udev
);
1204 /* Unregister the device. The device driver is responsible
1205 * for removing the device files from usbfs and sysfs and for
1206 * de-configuring the device.
1208 device_del(&udev
->dev
);
1210 /* Free the device number and delete the parent's children[]
1211 * (or root_hub) pointer.
1213 release_address(udev
);
1215 /* Avoid races with recursively_mark_NOTATTACHED() */
1216 spin_lock_irq(&device_state_lock
);
1218 spin_unlock_irq(&device_state_lock
);
1222 put_device(&udev
->dev
);
1225 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1226 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1230 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1233 static void announce_device(struct usb_device
*udev
)
1235 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1236 le16_to_cpu(udev
->descriptor
.idVendor
),
1237 le16_to_cpu(udev
->descriptor
.idProduct
));
1238 dev_info(&udev
->dev
, "New USB device strings: Mfr=%d, Product=%d, "
1239 "SerialNumber=%d\n",
1240 udev
->descriptor
.iManufacturer
,
1241 udev
->descriptor
.iProduct
,
1242 udev
->descriptor
.iSerialNumber
);
1243 show_string(udev
, "Product", udev
->product
);
1244 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1245 show_string(udev
, "SerialNumber", udev
->serial
);
1248 static inline void announce_device(struct usb_device
*udev
) { }
1251 #ifdef CONFIG_USB_OTG
1252 #include "otg_whitelist.h"
1256 * usb_configure_device_otg - FIXME (usbcore-internal)
1257 * @udev: newly addressed device (in ADDRESS state)
1259 * Do configuration for On-The-Go devices
1261 static int usb_configure_device_otg(struct usb_device
*udev
)
1265 #ifdef CONFIG_USB_OTG
1267 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1268 * to wake us after we've powered off VBUS; and HNP, switching roles
1269 * "host" to "peripheral". The OTG descriptor helps figure this out.
1271 if (!udev
->bus
->is_b_host
1273 && udev
->parent
== udev
->bus
->root_hub
) {
1274 struct usb_otg_descriptor
*desc
= 0;
1275 struct usb_bus
*bus
= udev
->bus
;
1277 /* descriptor may appear anywhere in config */
1278 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1279 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1280 USB_DT_OTG
, (void **) &desc
) == 0) {
1281 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1282 unsigned port1
= udev
->portnum
;
1284 dev_info(&udev
->dev
,
1285 "Dual-Role OTG device on %sHNP port\n",
1286 (port1
== bus
->otg_port
)
1289 /* enable HNP before suspend, it's simpler */
1290 if (port1
== bus
->otg_port
)
1291 bus
->b_hnp_enable
= 1;
1292 err
= usb_control_msg(udev
,
1293 usb_sndctrlpipe(udev
, 0),
1294 USB_REQ_SET_FEATURE
, 0,
1296 ? USB_DEVICE_B_HNP_ENABLE
1297 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1298 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1300 /* OTG MESSAGE: report errors here,
1301 * customize to match your product.
1303 dev_info(&udev
->dev
,
1304 "can't set HNP mode; %d\n",
1306 bus
->b_hnp_enable
= 0;
1312 if (!is_targeted(udev
)) {
1314 /* Maybe it can talk to us, though we can't talk to it.
1315 * (Includes HNP test device.)
1317 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1318 err
= usb_port_suspend(udev
);
1320 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1332 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1333 * @udev: newly addressed device (in ADDRESS state)
1335 * This is only called by usb_new_device() and usb_authorize_device()
1336 * and FIXME -- all comments that apply to them apply here wrt to
1339 * If the device is WUSB and not authorized, we don't attempt to read
1340 * the string descriptors, as they will be errored out by the device
1341 * until it has been authorized.
1343 static int usb_configure_device(struct usb_device
*udev
)
1347 if (udev
->config
== NULL
) {
1348 err
= usb_get_configuration(udev
);
1350 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1355 if (udev
->wusb
== 1 && udev
->authorized
== 0) {
1356 udev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1357 udev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1358 udev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1361 /* read the standard strings and cache them if present */
1362 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1363 udev
->manufacturer
= usb_cache_string(udev
,
1364 udev
->descriptor
.iManufacturer
);
1365 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1367 err
= usb_configure_device_otg(udev
);
1374 * usb_new_device - perform initial device setup (usbcore-internal)
1375 * @udev: newly addressed device (in ADDRESS state)
1377 * This is called with devices which have been enumerated, but not yet
1378 * configured. The device descriptor is available, but not descriptors
1379 * for any device configuration. The caller must have locked either
1380 * the parent hub (if udev is a normal device) or else the
1381 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1382 * udev has already been installed, but udev is not yet visible through
1383 * sysfs or other filesystem code.
1385 * It will return if the device is configured properly or not. Zero if
1386 * the interface was registered with the driver core; else a negative
1389 * This call is synchronous, and may not be used in an interrupt context.
1391 * Only the hub driver or root-hub registrar should ever call this.
1393 int usb_new_device(struct usb_device
*udev
)
1397 usb_detect_quirks(udev
); /* Determine quirks */
1398 err
= usb_configure_device(udev
); /* detect & probe dev/intfs */
1401 /* export the usbdev device-node for libusb */
1402 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1403 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1405 /* Increment the parent's count of unsuspended children */
1407 usb_autoresume_device(udev
->parent
);
1409 /* Register the device. The device driver is responsible
1410 * for adding the device files to sysfs and for configuring
1413 err
= device_add(&udev
->dev
);
1415 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1419 /* Tell the world! */
1420 announce_device(udev
);
1424 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1430 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1431 * @usb_dev: USB device
1433 * Move the USB device to a very basic state where interfaces are disabled
1434 * and the device is in fact unconfigured and unusable.
1436 * We share a lock (that we have) with device_del(), so we need to
1439 int usb_deauthorize_device(struct usb_device
*usb_dev
)
1442 usb_lock_device(usb_dev
);
1443 if (usb_dev
->authorized
== 0)
1444 goto out_unauthorized
;
1445 usb_dev
->authorized
= 0;
1446 usb_set_configuration(usb_dev
, -1);
1447 usb_dev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1448 usb_dev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1449 usb_dev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1450 kfree(usb_dev
->config
);
1451 usb_dev
->config
= NULL
;
1452 for (cnt
= 0; cnt
< usb_dev
->descriptor
.bNumConfigurations
; cnt
++)
1453 kfree(usb_dev
->rawdescriptors
[cnt
]);
1454 usb_dev
->descriptor
.bNumConfigurations
= 0;
1455 kfree(usb_dev
->rawdescriptors
);
1457 usb_unlock_device(usb_dev
);
1462 int usb_authorize_device(struct usb_device
*usb_dev
)
1465 usb_lock_device(usb_dev
);
1466 if (usb_dev
->authorized
== 1)
1467 goto out_authorized
;
1468 kfree(usb_dev
->product
);
1469 usb_dev
->product
= NULL
;
1470 kfree(usb_dev
->manufacturer
);
1471 usb_dev
->manufacturer
= NULL
;
1472 kfree(usb_dev
->serial
);
1473 usb_dev
->serial
= NULL
;
1474 result
= usb_autoresume_device(usb_dev
);
1476 dev_err(&usb_dev
->dev
,
1477 "can't autoresume for authorization: %d\n", result
);
1478 goto error_autoresume
;
1480 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
1482 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
1483 "authorization: %d\n", result
);
1484 goto error_device_descriptor
;
1486 usb_dev
->authorized
= 1;
1487 result
= usb_configure_device(usb_dev
);
1489 goto error_configure
;
1490 /* Choose and set the configuration. This registers the interfaces
1491 * with the driver core and lets interface drivers bind to them.
1493 c
= usb_choose_configuration(usb_dev
);
1495 result
= usb_set_configuration(usb_dev
, c
);
1497 dev_err(&usb_dev
->dev
,
1498 "can't set config #%d, error %d\n", c
, result
);
1499 /* This need not be fatal. The user can try to
1500 * set other configurations. */
1503 dev_info(&usb_dev
->dev
, "authorized to connect\n");
1505 error_device_descriptor
:
1508 usb_unlock_device(usb_dev
); // complements locktree
1513 static int hub_port_status(struct usb_hub
*hub
, int port1
,
1514 u16
*status
, u16
*change
)
1518 mutex_lock(&hub
->status_mutex
);
1519 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
1521 dev_err (hub
->intfdev
,
1522 "%s failed (err = %d)\n", __FUNCTION__
, ret
);
1526 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
1527 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
1530 mutex_unlock(&hub
->status_mutex
);
1535 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1536 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1538 struct usb_hcd
*hcd
;
1539 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1541 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1542 return hcd
->wireless
;
1546 #define PORT_RESET_TRIES 5
1547 #define SET_ADDRESS_TRIES 2
1548 #define GET_DESCRIPTOR_TRIES 2
1549 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1550 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1552 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1553 #define HUB_SHORT_RESET_TIME 10
1554 #define HUB_LONG_RESET_TIME 200
1555 #define HUB_RESET_TIMEOUT 500
1557 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1558 struct usb_device
*udev
, unsigned int delay
)
1560 int delay_time
, ret
;
1564 for (delay_time
= 0;
1565 delay_time
< HUB_RESET_TIMEOUT
;
1566 delay_time
+= delay
) {
1567 /* wait to give the device a chance to reset */
1570 /* read and decode port status */
1571 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1575 /* Device went away? */
1576 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1579 /* bomb out completely if the connection bounced */
1580 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1583 /* if we`ve finished resetting, then break out of the loop */
1584 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1585 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1586 if (hub_is_wusb(hub
))
1587 udev
->speed
= USB_SPEED_VARIABLE
;
1588 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1589 udev
->speed
= USB_SPEED_HIGH
;
1590 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1591 udev
->speed
= USB_SPEED_LOW
;
1593 udev
->speed
= USB_SPEED_FULL
;
1597 /* switch to the long delay after two short delay failures */
1598 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1599 delay
= HUB_LONG_RESET_TIME
;
1601 dev_dbg (hub
->intfdev
,
1602 "port %d not reset yet, waiting %dms\n",
1609 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1610 struct usb_device
*udev
, unsigned int delay
)
1614 /* Block EHCI CF initialization during the port reset.
1615 * Some companion controllers don't like it when they mix.
1617 down_read(&ehci_cf_port_reset_rwsem
);
1619 /* Reset the port */
1620 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1621 status
= set_port_feature(hub
->hdev
,
1622 port1
, USB_PORT_FEAT_RESET
);
1624 dev_err(hub
->intfdev
,
1625 "cannot reset port %d (err = %d)\n",
1628 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1629 if (status
&& status
!= -ENOTCONN
)
1630 dev_dbg(hub
->intfdev
,
1631 "port_wait_reset: err = %d\n",
1635 /* return on disconnect or reset */
1638 /* TRSTRCY = 10 ms; plus some extra */
1640 udev
->devnum
= 0; /* Device now at address 0 */
1644 clear_port_feature(hub
->hdev
,
1645 port1
, USB_PORT_FEAT_C_RESET
);
1646 /* FIXME need disconnect() for NOTATTACHED device */
1647 usb_set_device_state(udev
, status
1648 ? USB_STATE_NOTATTACHED
1649 : USB_STATE_DEFAULT
);
1653 dev_dbg (hub
->intfdev
,
1654 "port %d not enabled, trying reset again...\n",
1656 delay
= HUB_LONG_RESET_TIME
;
1659 dev_err (hub
->intfdev
,
1660 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1664 up_read(&ehci_cf_port_reset_rwsem
);
1670 #ifdef CONFIG_USB_SUSPEND
1673 * usb_port_suspend - suspend a usb device's upstream port
1674 * @udev: device that's no longer in active use, not a root hub
1675 * Context: must be able to sleep; device not locked; pm locks held
1677 * Suspends a USB device that isn't in active use, conserving power.
1678 * Devices may wake out of a suspend, if anything important happens,
1679 * using the remote wakeup mechanism. They may also be taken out of
1680 * suspend by the host, using usb_port_resume(). It's also routine
1681 * to disconnect devices while they are suspended.
1683 * This only affects the USB hardware for a device; its interfaces
1684 * (and, for hubs, child devices) must already have been suspended.
1686 * Selective port suspend reduces power; most suspended devices draw
1687 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1688 * All devices below the suspended port are also suspended.
1690 * Devices leave suspend state when the host wakes them up. Some devices
1691 * also support "remote wakeup", where the device can activate the USB
1692 * tree above them to deliver data, such as a keypress or packet. In
1693 * some cases, this wakes the USB host.
1695 * Suspending OTG devices may trigger HNP, if that's been enabled
1696 * between a pair of dual-role devices. That will change roles, such
1697 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1699 * Devices on USB hub ports have only one "suspend" state, corresponding
1700 * to ACPI D2, "may cause the device to lose some context".
1701 * State transitions include:
1703 * - suspend, resume ... when the VBUS power link stays live
1704 * - suspend, disconnect ... VBUS lost
1706 * Once VBUS drop breaks the circuit, the port it's using has to go through
1707 * normal re-enumeration procedures, starting with enabling VBUS power.
1708 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1709 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1710 * timer, no SRP, no requests through sysfs.
1712 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1713 * the root hub for their bus goes into global suspend ... so we don't
1714 * (falsely) update the device power state to say it suspended.
1716 * Returns 0 on success, else negative errno.
1718 int usb_port_suspend(struct usb_device
*udev
)
1720 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1721 int port1
= udev
->portnum
;
1724 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1726 /* enable remote wakeup when appropriate; this lets the device
1727 * wake up the upstream hub (including maybe the root hub).
1729 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1730 * we don't explicitly enable it here.
1732 if (udev
->do_remote_wakeup
) {
1733 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1734 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1735 USB_DEVICE_REMOTE_WAKEUP
, 0,
1737 USB_CTRL_SET_TIMEOUT
);
1739 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
1744 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1746 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
1748 /* paranoia: "should not happen" */
1749 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1750 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1751 USB_DEVICE_REMOTE_WAKEUP
, 0,
1753 USB_CTRL_SET_TIMEOUT
);
1755 /* device has up to 10 msec to fully suspend */
1756 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1757 udev
->auto_pm
? "auto-" : "");
1758 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1765 * If the USB "suspend" state is in use (rather than "global suspend"),
1766 * many devices will be individually taken out of suspend state using
1767 * special "resume" signaling. This routine kicks in shortly after
1768 * hardware resume signaling is finished, either because of selective
1769 * resume (by host) or remote wakeup (by device) ... now see what changed
1770 * in the tree that's rooted at this device.
1772 * If @udev->reset_resume is set then the device is reset before the
1773 * status check is done.
1775 static int finish_port_resume(struct usb_device
*udev
)
1780 /* caller owns the udev device lock */
1781 dev_dbg(&udev
->dev
, "finish %sresume\n",
1782 udev
->reset_resume
? "reset-" : "");
1784 /* usb ch9 identifies four variants of SUSPENDED, based on what
1785 * state the device resumes to. Linux currently won't see the
1786 * first two on the host side; they'd be inside hub_port_init()
1787 * during many timeouts, but khubd can't suspend until later.
1789 usb_set_device_state(udev
, udev
->actconfig
1790 ? USB_STATE_CONFIGURED
1791 : USB_STATE_ADDRESS
);
1793 /* 10.5.4.5 says not to reset a suspended port if the attached
1794 * device is enabled for remote wakeup. Hence the reset
1795 * operation is carried out here, after the port has been
1798 if (udev
->reset_resume
)
1799 status
= usb_reset_device(udev
);
1801 /* 10.5.4.5 says be sure devices in the tree are still there.
1802 * For now let's assume the device didn't go crazy on resume,
1803 * and device drivers will know about any resume quirks.
1807 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1809 status
= (status
> 0 ? 0 : -ENODEV
);
1813 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
1815 } else if (udev
->actconfig
) {
1816 le16_to_cpus(&devstatus
);
1817 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
1818 status
= usb_control_msg(udev
,
1819 usb_sndctrlpipe(udev
, 0),
1820 USB_REQ_CLEAR_FEATURE
,
1822 USB_DEVICE_REMOTE_WAKEUP
, 0,
1824 USB_CTRL_SET_TIMEOUT
);
1826 dev_dbg(&udev
->dev
, "disable remote "
1827 "wakeup, status %d\n", status
);
1835 * usb_port_resume - re-activate a suspended usb device's upstream port
1836 * @udev: device to re-activate, not a root hub
1837 * Context: must be able to sleep; device not locked; pm locks held
1839 * This will re-activate the suspended device, increasing power usage
1840 * while letting drivers communicate again with its endpoints.
1841 * USB resume explicitly guarantees that the power session between
1842 * the host and the device is the same as it was when the device
1845 * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this
1846 * routine won't check that the port is still enabled. Furthermore,
1847 * if @udev->reset_resume is set then finish_port_resume() above will
1848 * reset @udev. The end result is that a broken power session can be
1849 * recovered and @udev will appear to persist across a loss of VBUS power.
1851 * For example, if a host controller doesn't maintain VBUS suspend current
1852 * during a system sleep or is reset when the system wakes up, all the USB
1853 * power sessions below it will be broken. This is especially troublesome
1854 * for mass-storage devices containing mounted filesystems, since the
1855 * device will appear to have disconnected and all the memory mappings
1856 * to it will be lost. Using the USB_PERSIST facility, the device can be
1857 * made to appear as if it had not disconnected.
1859 * This facility is inherently dangerous. Although usb_reset_device()
1860 * makes every effort to insure that the same device is present after the
1861 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
1862 * quite possible for a device to remain unaltered but its media to be
1863 * changed. If the user replaces a flash memory card while the system is
1864 * asleep, he will have only himself to blame when the filesystem on the
1865 * new card is corrupted and the system crashes.
1867 * Returns 0 on success, else negative errno.
1869 int usb_port_resume(struct usb_device
*udev
)
1871 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1872 int port1
= udev
->portnum
;
1874 u16 portchange
, portstatus
;
1875 unsigned mask_flags
, want_flags
;
1877 /* Skip the initial Clear-Suspend step for a remote wakeup */
1878 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1879 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
1880 goto SuspendCleared
;
1882 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1884 set_bit(port1
, hub
->busy_bits
);
1886 /* see 7.1.7.7; affects power usage, but not budgeting */
1887 status
= clear_port_feature(hub
->hdev
,
1888 port1
, USB_PORT_FEAT_SUSPEND
);
1890 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
1893 /* drive resume for at least 20 msec */
1894 dev_dbg(&udev
->dev
, "usb %sresume\n",
1895 udev
->auto_pm
? "auto-" : "");
1898 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1899 * stop resume signaling. Then finish the resume
1902 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1905 if (USB_PERSIST
&& udev
->reset_resume
)
1906 want_flags
= USB_PORT_STAT_POWER
1907 | USB_PORT_STAT_CONNECTION
;
1909 want_flags
= USB_PORT_STAT_POWER
1910 | USB_PORT_STAT_CONNECTION
1911 | USB_PORT_STAT_ENABLE
;
1912 mask_flags
= want_flags
| USB_PORT_STAT_SUSPEND
;
1914 if (status
< 0 || (portstatus
& mask_flags
) != want_flags
) {
1915 dev_dbg(hub
->intfdev
,
1916 "port %d status %04x.%04x after resume, %d\n",
1917 port1
, portchange
, portstatus
, status
);
1921 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
1922 clear_port_feature(hub
->hdev
, port1
,
1923 USB_PORT_FEAT_C_SUSPEND
);
1924 /* TRSMRCY = 10 msec */
1929 clear_bit(port1
, hub
->busy_bits
);
1930 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
1931 usb_enable_root_hub_irq(hub
->hdev
->bus
);
1934 status
= finish_port_resume(udev
);
1936 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
1937 hub_port_logical_disconnect(hub
, port1
);
1942 static int remote_wakeup(struct usb_device
*udev
)
1946 usb_lock_device(udev
);
1947 if (udev
->state
== USB_STATE_SUSPENDED
) {
1948 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
1949 usb_mark_last_busy(udev
);
1950 status
= usb_external_resume_device(udev
);
1952 usb_unlock_device(udev
);
1956 #else /* CONFIG_USB_SUSPEND */
1958 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1960 int usb_port_suspend(struct usb_device
*udev
)
1965 int usb_port_resume(struct usb_device
*udev
)
1969 /* However we may need to do a reset-resume */
1970 if (udev
->reset_resume
) {
1971 dev_dbg(&udev
->dev
, "reset-resume\n");
1972 status
= usb_reset_device(udev
);
1977 static inline int remote_wakeup(struct usb_device
*udev
)
1984 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
1986 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1987 struct usb_device
*hdev
= hub
->hdev
;
1990 /* fail if children aren't already suspended */
1991 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
1992 struct usb_device
*udev
;
1994 udev
= hdev
->children
[port1
-1];
1995 if (udev
&& udev
->can_submit
) {
1997 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
2003 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
2005 /* stop khubd and related activity */
2010 static int hub_resume(struct usb_interface
*intf
)
2012 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2014 dev_dbg(&intf
->dev
, "%s\n", __FUNCTION__
);
2016 /* tell khubd to look for changes on this hub */
2021 static int hub_reset_resume(struct usb_interface
*intf
)
2023 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2024 struct usb_device
*hdev
= hub
->hdev
;
2029 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2030 struct usb_device
*child
= hdev
->children
[port1
-1];
2034 /* For "USB_PERSIST"-enabled children we must
2035 * mark the child device for reset-resume and
2036 * turn off the connect-change status to prevent
2037 * khubd from disconnecting it later.
2039 if (USB_PERSIST
&& child
->persist_enabled
) {
2040 child
->reset_resume
= 1;
2041 clear_port_feature(hdev
, port1
,
2042 USB_PORT_FEAT_C_CONNECTION
);
2044 /* Otherwise we must disconnect the child,
2045 * but as we may not lock the child device here
2046 * we have to do a "logical" disconnect.
2049 hub_port_logical_disconnect(hub
, port1
);
2059 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2060 * @rhdev: struct usb_device for the root hub
2062 * The USB host controller driver calls this function when its root hub
2063 * is resumed and Vbus power has been interrupted or the controller
2064 * has been reset. The routine marks @rhdev as having lost power. When
2065 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
2066 * is enabled then it will carry out power-session recovery, otherwise
2067 * it will disconnect all the child devices.
2069 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
2071 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
2072 rhdev
->reset_resume
= 1;
2074 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
2076 #else /* CONFIG_PM */
2078 static inline int remote_wakeup(struct usb_device
*udev
)
2083 #define hub_suspend NULL
2084 #define hub_resume NULL
2085 #define hub_reset_resume NULL
2089 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2091 * Between connect detection and reset signaling there must be a delay
2092 * of 100ms at least for debounce and power-settling. The corresponding
2093 * timer shall restart whenever the downstream port detects a disconnect.
2095 * Apparently there are some bluetooth and irda-dongles and a number of
2096 * low-speed devices for which this debounce period may last over a second.
2097 * Not covered by the spec - but easy to deal with.
2099 * This implementation uses a 1500ms total debounce timeout; if the
2100 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2101 * every 25ms for transient disconnects. When the port status has been
2102 * unchanged for 100ms it returns the port status.
2105 #define HUB_DEBOUNCE_TIMEOUT 1500
2106 #define HUB_DEBOUNCE_STEP 25
2107 #define HUB_DEBOUNCE_STABLE 100
2109 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2112 int total_time
, stable_time
= 0;
2113 u16 portchange
, portstatus
;
2114 unsigned connection
= 0xffff;
2116 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2117 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2121 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2122 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2123 stable_time
+= HUB_DEBOUNCE_STEP
;
2124 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2128 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2131 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2132 clear_port_feature(hub
->hdev
, port1
,
2133 USB_PORT_FEAT_C_CONNECTION
);
2136 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2138 msleep(HUB_DEBOUNCE_STEP
);
2141 dev_dbg (hub
->intfdev
,
2142 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2143 port1
, total_time
, stable_time
, portstatus
);
2145 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2150 static void ep0_reinit(struct usb_device
*udev
)
2152 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2153 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2154 usb_enable_endpoint(udev
, &udev
->ep0
);
2157 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2158 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2160 static int hub_set_address(struct usb_device
*udev
, int devnum
)
2166 if (udev
->state
== USB_STATE_ADDRESS
)
2168 if (udev
->state
!= USB_STATE_DEFAULT
)
2170 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2171 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
2172 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2174 udev
->devnum
= devnum
; /* Device now using proper address */
2175 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2181 /* Reset device, (re)assign address, get device descriptor.
2182 * Device connection must be stable, no more debouncing needed.
2183 * Returns device in USB_STATE_ADDRESS, except on error.
2185 * If this is called for an already-existing device (as part of
2186 * usb_reset_device), the caller must own the device lock. For a
2187 * newly detected device that is not accessible through any global
2188 * pointers, it's not necessary to lock the device.
2191 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2194 static DEFINE_MUTEX(usb_address0_mutex
);
2196 struct usb_device
*hdev
= hub
->hdev
;
2198 unsigned delay
= HUB_SHORT_RESET_TIME
;
2199 enum usb_device_speed oldspeed
= udev
->speed
;
2201 int devnum
= udev
->devnum
;
2203 /* root hub ports have a slightly longer reset period
2204 * (from USB 2.0 spec, section 7.1.7.5)
2206 if (!hdev
->parent
) {
2207 delay
= HUB_ROOT_RESET_TIME
;
2208 if (port1
== hdev
->bus
->otg_port
)
2209 hdev
->bus
->b_hnp_enable
= 0;
2212 /* Some low speed devices have problems with the quick delay, so */
2213 /* be a bit pessimistic with those devices. RHbug #23670 */
2214 if (oldspeed
== USB_SPEED_LOW
)
2215 delay
= HUB_LONG_RESET_TIME
;
2217 mutex_lock(&usb_address0_mutex
);
2219 /* Reset the device; full speed may morph to high speed */
2220 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2221 if (retval
< 0) /* error or disconnect */
2223 /* success, speed is known */
2226 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2227 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2230 oldspeed
= udev
->speed
;
2232 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2233 * it's fixed size except for full speed devices.
2234 * For Wireless USB devices, ep0 max packet is always 512 (tho
2235 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2237 switch (udev
->speed
) {
2238 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2239 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2241 case USB_SPEED_HIGH
: /* fixed at 64 */
2242 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2244 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2245 /* to determine the ep0 maxpacket size, try to read
2246 * the device descriptor to get bMaxPacketSize0 and
2247 * then correct our initial guess.
2249 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2251 case USB_SPEED_LOW
: /* fixed at 8 */
2252 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2259 switch (udev
->speed
) {
2260 case USB_SPEED_LOW
: speed
= "low"; break;
2261 case USB_SPEED_FULL
: speed
= "full"; break;
2262 case USB_SPEED_HIGH
: speed
= "high"; break;
2263 case USB_SPEED_VARIABLE
:
2267 default: speed
= "?"; break;
2269 dev_info (&udev
->dev
,
2270 "%s %s speed %sUSB device using %s and address %d\n",
2271 (udev
->config
) ? "reset" : "new", speed
, type
,
2272 udev
->bus
->controller
->driver
->name
, devnum
);
2274 /* Set up TT records, if needed */
2276 udev
->tt
= hdev
->tt
;
2277 udev
->ttport
= hdev
->ttport
;
2278 } else if (udev
->speed
!= USB_SPEED_HIGH
2279 && hdev
->speed
== USB_SPEED_HIGH
) {
2280 udev
->tt
= &hub
->tt
;
2281 udev
->ttport
= port1
;
2284 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2285 * Because device hardware and firmware is sometimes buggy in
2286 * this area, and this is how Linux has done it for ages.
2287 * Change it cautiously.
2289 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2290 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2291 * so it may help with some non-standards-compliant devices.
2292 * Otherwise we start with SET_ADDRESS and then try to read the
2293 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2296 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2297 if (USE_NEW_SCHEME(retry_counter
)) {
2298 struct usb_device_descriptor
*buf
;
2301 #define GET_DESCRIPTOR_BUFSIZE 64
2302 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2308 /* Retry on all errors; some devices are flakey.
2309 * 255 is for WUSB devices, we actually need to use
2310 * 512 (WUSB1.0[4.8.1]).
2312 for (j
= 0; j
< 3; ++j
) {
2313 buf
->bMaxPacketSize0
= 0;
2314 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2315 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2316 USB_DT_DEVICE
<< 8, 0,
2317 buf
, GET_DESCRIPTOR_BUFSIZE
,
2318 USB_CTRL_GET_TIMEOUT
);
2319 switch (buf
->bMaxPacketSize0
) {
2320 case 8: case 16: case 32: case 64: case 255:
2321 if (buf
->bDescriptorType
==
2335 udev
->descriptor
.bMaxPacketSize0
=
2336 buf
->bMaxPacketSize0
;
2339 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2340 if (retval
< 0) /* error or disconnect */
2342 if (oldspeed
!= udev
->speed
) {
2344 "device reset changed speed!\n");
2349 dev_err(&udev
->dev
, "device descriptor "
2350 "read/%s, error %d\n",
2355 #undef GET_DESCRIPTOR_BUFSIZE
2358 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2359 retval
= hub_set_address(udev
, devnum
);
2366 "device not accepting address %d, error %d\n",
2371 /* cope with hardware quirkiness:
2372 * - let SET_ADDRESS settle, some device hardware wants it
2373 * - read ep0 maxpacket even for high and low speed,
2376 if (USE_NEW_SCHEME(retry_counter
))
2379 retval
= usb_get_device_descriptor(udev
, 8);
2381 dev_err(&udev
->dev
, "device descriptor "
2382 "read/%s, error %d\n",
2394 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff?
2395 512 : udev
->descriptor
.bMaxPacketSize0
;
2396 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2397 if (udev
->speed
!= USB_SPEED_FULL
||
2398 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2399 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2403 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2404 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2408 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2409 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2410 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2421 hub_port_disable(hub
, port1
, 0);
2422 udev
->devnum
= devnum
; /* for disconnect processing */
2424 mutex_unlock(&usb_address0_mutex
);
2429 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2431 struct usb_qualifier_descriptor
*qual
;
2434 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2438 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2439 qual
, sizeof *qual
);
2440 if (status
== sizeof *qual
) {
2441 dev_info(&udev
->dev
, "not running at top speed; "
2442 "connect to a high speed hub\n");
2443 /* hub LEDs are probably harder to miss than syslog */
2444 if (hub
->has_indicators
) {
2445 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2446 schedule_delayed_work (&hub
->leds
, 0);
2453 hub_power_remaining (struct usb_hub
*hub
)
2455 struct usb_device
*hdev
= hub
->hdev
;
2459 if (!hub
->limited_power
)
2462 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2463 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2464 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2470 /* Unconfigured devices may not use more than 100mA,
2471 * or 8mA for OTG ports */
2472 if (udev
->actconfig
)
2473 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2474 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2478 if (delta
> hub
->mA_per_port
)
2479 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2481 delta
, hub
->mA_per_port
, port1
);
2484 if (remaining
< 0) {
2485 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2492 /* Handle physical or logical connection change events.
2493 * This routine is called when:
2494 * a port connection-change occurs;
2495 * a port enable-change occurs (often caused by EMI);
2496 * usb_reset_device() encounters changed descriptors (as from
2497 * a firmware download)
2498 * caller already locked the hub
2500 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2501 u16 portstatus
, u16 portchange
)
2503 struct usb_device
*hdev
= hub
->hdev
;
2504 struct device
*hub_dev
= hub
->intfdev
;
2505 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2506 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2510 "port %d, status %04x, change %04x, %s\n",
2511 port1
, portstatus
, portchange
, portspeed (portstatus
));
2513 if (hub
->has_indicators
) {
2514 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2515 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2518 /* Disconnect any existing devices under this port */
2519 if (hdev
->children
[port1
-1])
2520 usb_disconnect(&hdev
->children
[port1
-1]);
2521 clear_bit(port1
, hub
->change_bits
);
2523 #ifdef CONFIG_USB_OTG
2524 /* during HNP, don't repeat the debounce */
2525 if (hdev
->bus
->is_b_host
)
2526 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2529 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2530 status
= hub_port_debounce(hub
, port1
);
2532 if (printk_ratelimit())
2533 dev_err (hub_dev
, "connect-debounce failed, "
2534 "port %d disabled\n", port1
);
2537 portstatus
= status
;
2540 /* Return now if nothing is connected */
2541 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2543 /* maybe switch power back on (e.g. root hub was reset) */
2544 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2545 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2546 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2548 if (portstatus
& USB_PORT_STAT_ENABLE
)
2553 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2554 struct usb_device
*udev
;
2556 /* reallocate for each attempt, since references
2557 * to the previous one can escape in various ways
2559 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2562 "couldn't allocate port %d usb_device\n",
2567 usb_set_device_state(udev
, USB_STATE_POWERED
);
2568 udev
->speed
= USB_SPEED_UNKNOWN
;
2569 udev
->bus_mA
= hub
->mA_per_port
;
2570 udev
->level
= hdev
->level
+ 1;
2572 /* set the address */
2573 choose_address(udev
);
2574 if (udev
->devnum
<= 0) {
2575 status
= -ENOTCONN
; /* Don't retry */
2579 /* reset and get descriptor */
2580 status
= hub_port_init(hub
, udev
, port1
, i
);
2584 /* consecutive bus-powered hubs aren't reliable; they can
2585 * violate the voltage drop budget. if the new child has
2586 * a "powered" LED, users should notice we didn't enable it
2587 * (without reading syslog), even without per-port LEDs
2590 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2591 && udev
->bus_mA
<= 100) {
2594 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2597 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2600 le16_to_cpus(&devstat
);
2601 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2603 "can't connect bus-powered hub "
2605 if (hub
->has_indicators
) {
2606 hub
->indicator
[port1
-1] =
2607 INDICATOR_AMBER_BLINK
;
2608 schedule_delayed_work (&hub
->leds
, 0);
2610 status
= -ENOTCONN
; /* Don't retry */
2615 /* check for devices running slower than they could */
2616 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2617 && udev
->speed
== USB_SPEED_FULL
2618 && highspeed_hubs
!= 0)
2619 check_highspeed (hub
, udev
, port1
);
2621 /* Store the parent's children[] pointer. At this point
2622 * udev becomes globally accessible, although presumably
2623 * no one will look at it until hdev is unlocked.
2627 /* We mustn't add new devices if the parent hub has
2628 * been disconnected; we would race with the
2629 * recursively_mark_NOTATTACHED() routine.
2631 spin_lock_irq(&device_state_lock
);
2632 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2635 hdev
->children
[port1
-1] = udev
;
2636 spin_unlock_irq(&device_state_lock
);
2638 /* Run it through the hoops (find a driver, etc) */
2640 status
= usb_new_device(udev
);
2642 spin_lock_irq(&device_state_lock
);
2643 hdev
->children
[port1
-1] = NULL
;
2644 spin_unlock_irq(&device_state_lock
);
2651 status
= hub_power_remaining(hub
);
2653 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2658 hub_port_disable(hub
, port1
, 1);
2661 release_address(udev
);
2663 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
2668 hub_port_disable(hub
, port1
, 1);
2669 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
2670 hcd
->driver
->relinquish_port(hcd
, port1
);
2673 static void hub_events(void)
2675 struct list_head
*tmp
;
2676 struct usb_device
*hdev
;
2677 struct usb_interface
*intf
;
2678 struct usb_hub
*hub
;
2679 struct device
*hub_dev
;
2688 * We restart the list every time to avoid a deadlock with
2689 * deleting hubs downstream from this one. This should be
2690 * safe since we delete the hub from the event list.
2691 * Not the most efficient, but avoids deadlocks.
2695 /* Grab the first entry at the beginning of the list */
2696 spin_lock_irq(&hub_event_lock
);
2697 if (list_empty(&hub_event_list
)) {
2698 spin_unlock_irq(&hub_event_lock
);
2702 tmp
= hub_event_list
.next
;
2705 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2706 kref_get(&hub
->kref
);
2707 spin_unlock_irq(&hub_event_lock
);
2710 hub_dev
= hub
->intfdev
;
2711 intf
= to_usb_interface(hub_dev
);
2712 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2713 hdev
->state
, hub
->descriptor
2714 ? hub
->descriptor
->bNbrPorts
2716 /* NOTE: expects max 15 ports... */
2717 (u16
) hub
->change_bits
[0],
2718 (u16
) hub
->event_bits
[0]);
2720 /* Lock the device, then check to see if we were
2721 * disconnected while waiting for the lock to succeed. */
2722 usb_lock_device(hdev
);
2723 if (unlikely(hub
->disconnected
))
2726 /* If the hub has died, clean up after it */
2727 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2728 hub
->error
= -ENODEV
;
2729 hub_pre_reset(intf
);
2734 ret
= usb_autopm_get_interface(intf
);
2736 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2740 /* If this is an inactive hub, do nothing */
2745 dev_dbg (hub_dev
, "resetting for error %d\n",
2748 ret
= usb_reset_composite_device(hdev
, intf
);
2751 "error resetting hub: %d\n", ret
);
2759 /* deal with port status changes */
2760 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2761 if (test_bit(i
, hub
->busy_bits
))
2763 connect_change
= test_bit(i
, hub
->change_bits
);
2764 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2765 !connect_change
&& !hub
->activating
)
2768 ret
= hub_port_status(hub
, i
,
2769 &portstatus
, &portchange
);
2773 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2775 USB_PORT_STAT_CONNECTION
))
2778 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2779 clear_port_feature(hdev
, i
,
2780 USB_PORT_FEAT_C_CONNECTION
);
2784 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2785 if (!connect_change
)
2787 "port %d enable change, "
2790 clear_port_feature(hdev
, i
,
2791 USB_PORT_FEAT_C_ENABLE
);
2794 * EM interference sometimes causes badly
2795 * shielded USB devices to be shutdown by
2796 * the hub, this hack enables them again.
2797 * Works at least with mouse driver.
2799 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2801 && hdev
->children
[i
-1]) {
2804 "disabled by hub (EMI?), "
2811 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2812 clear_port_feature(hdev
, i
,
2813 USB_PORT_FEAT_C_SUSPEND
);
2814 if (hdev
->children
[i
-1]) {
2815 ret
= remote_wakeup(hdev
->
2821 hub_port_disable(hub
, i
, 1);
2824 "resume on port %d, status %d\n",
2828 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2830 "over-current change on port %d\n",
2832 clear_port_feature(hdev
, i
,
2833 USB_PORT_FEAT_C_OVER_CURRENT
);
2837 if (portchange
& USB_PORT_STAT_C_RESET
) {
2839 "reset change on port %d\n",
2841 clear_port_feature(hdev
, i
,
2842 USB_PORT_FEAT_C_RESET
);
2846 hub_port_connect_change(hub
, i
,
2847 portstatus
, portchange
);
2850 /* deal with hub status changes */
2851 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2853 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2854 dev_err (hub_dev
, "get_hub_status failed\n");
2856 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2857 dev_dbg (hub_dev
, "power change\n");
2858 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2859 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2860 /* FIXME: Is this always true? */
2861 hub
->limited_power
= 1;
2863 hub
->limited_power
= 0;
2865 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
2866 dev_dbg (hub_dev
, "overcurrent change\n");
2867 msleep(500); /* Cool down */
2868 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
2873 hub
->activating
= 0;
2875 /* If this is a root hub, tell the HCD it's okay to
2876 * re-enable port-change interrupts now. */
2877 if (!hdev
->parent
&& !hub
->busy_bits
[0])
2878 usb_enable_root_hub_irq(hdev
->bus
);
2881 /* Allow autosuspend if we're not going to run again */
2882 if (list_empty(&hub
->event_list
))
2883 usb_autopm_enable(intf
);
2885 usb_unlock_device(hdev
);
2886 kref_put(&hub
->kref
, hub_release
);
2888 } /* end while (1) */
2891 static int hub_thread(void *__unused
)
2893 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
2894 * port handover. Otherwise it might see that a full-speed device
2895 * was gone before the EHCI controller had handed its port over to
2896 * the companion full-speed controller.
2902 wait_event_freezable(khubd_wait
,
2903 !list_empty(&hub_event_list
) ||
2904 kthread_should_stop());
2905 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
2907 pr_debug("%s: khubd exiting\n", usbcore_name
);
2911 static struct usb_device_id hub_id_table
[] = {
2912 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
2913 .bDeviceClass
= USB_CLASS_HUB
},
2914 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
2915 .bInterfaceClass
= USB_CLASS_HUB
},
2916 { } /* Terminating entry */
2919 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
2921 static struct usb_driver hub_driver
= {
2924 .disconnect
= hub_disconnect
,
2925 .suspend
= hub_suspend
,
2926 .resume
= hub_resume
,
2927 .reset_resume
= hub_reset_resume
,
2928 .pre_reset
= hub_pre_reset
,
2929 .post_reset
= hub_post_reset
,
2931 .id_table
= hub_id_table
,
2932 .supports_autosuspend
= 1,
2935 int usb_hub_init(void)
2937 if (usb_register(&hub_driver
) < 0) {
2938 printk(KERN_ERR
"%s: can't register hub driver\n",
2943 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
2944 if (!IS_ERR(khubd_task
))
2947 /* Fall through if kernel_thread failed */
2948 usb_deregister(&hub_driver
);
2949 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
2954 void usb_hub_cleanup(void)
2956 kthread_stop(khubd_task
);
2959 * Hub resources are freed for us by usb_deregister. It calls
2960 * usb_driver_purge on every device which in turn calls that
2961 * devices disconnect function if it is using this driver.
2962 * The hub_disconnect function takes care of releasing the
2963 * individual hub resources. -greg
2965 usb_deregister(&hub_driver
);
2966 } /* usb_hub_cleanup() */
2968 static int config_descriptors_changed(struct usb_device
*udev
)
2972 struct usb_config_descriptor
*buf
;
2974 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2975 if (len
< le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
))
2976 len
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2978 buf
= kmalloc(len
, GFP_NOIO
);
2980 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
2981 /* assume the worst */
2984 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
2986 int old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
2988 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
2990 if (length
< old_length
) {
2991 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
2995 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
2997 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
2998 index
, buf
->bConfigurationValue
);
3003 return index
!= udev
->descriptor
.bNumConfigurations
;
3007 * usb_reset_device - perform a USB port reset to reinitialize a device
3008 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3010 * WARNING - don't use this routine to reset a composite device
3011 * (one with multiple interfaces owned by separate drivers)!
3012 * Use usb_reset_composite_device() instead.
3014 * Do a port reset, reassign the device's address, and establish its
3015 * former operating configuration. If the reset fails, or the device's
3016 * descriptors change from their values before the reset, or the original
3017 * configuration and altsettings cannot be restored, a flag will be set
3018 * telling khubd to pretend the device has been disconnected and then
3019 * re-connected. All drivers will be unbound, and the device will be
3020 * re-enumerated and probed all over again.
3022 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3023 * flagged for logical disconnection, or some other negative error code
3024 * if the reset wasn't even attempted.
3026 * The caller must own the device lock. For example, it's safe to use
3027 * this from a driver probe() routine after downloading new firmware.
3028 * For calls that might not occur during probe(), drivers should lock
3029 * the device using usb_lock_device_for_reset().
3031 * Locking exception: This routine may also be called from within an
3032 * autoresume handler. Such usage won't conflict with other tasks
3033 * holding the device lock because these tasks should always call
3034 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3036 int usb_reset_device(struct usb_device
*udev
)
3038 struct usb_device
*parent_hdev
= udev
->parent
;
3039 struct usb_hub
*parent_hub
;
3040 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3042 int port1
= udev
->portnum
;
3044 if (udev
->state
== USB_STATE_NOTATTACHED
||
3045 udev
->state
== USB_STATE_SUSPENDED
) {
3046 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3052 /* this requires hcd-specific logic; see OHCI hc_restart() */
3053 dev_dbg(&udev
->dev
, "%s for root hub!\n", __FUNCTION__
);
3056 parent_hub
= hdev_to_hub(parent_hdev
);
3058 set_bit(port1
, parent_hub
->busy_bits
);
3059 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3061 /* ep0 maxpacket size may change; let the HCD know about it.
3062 * Other endpoints will be handled by re-enumeration. */
3064 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3065 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
3068 clear_bit(port1
, parent_hub
->busy_bits
);
3069 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
3070 usb_enable_root_hub_irq(parent_hdev
->bus
);
3075 /* Device might have changed firmware (DFU or similar) */
3076 if (memcmp(&udev
->descriptor
, &descriptor
, sizeof descriptor
)
3077 || config_descriptors_changed (udev
)) {
3078 dev_info(&udev
->dev
, "device firmware changed\n");
3079 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3083 if (!udev
->actconfig
)
3086 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3087 USB_REQ_SET_CONFIGURATION
, 0,
3088 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3089 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3092 "can't restore configuration #%d (error=%d)\n",
3093 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3096 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3098 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3099 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3100 struct usb_interface_descriptor
*desc
;
3102 /* set_interface resets host side toggle even
3103 * for altsetting zero. the interface may have no driver.
3105 desc
= &intf
->cur_altsetting
->desc
;
3106 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3107 desc
->bAlternateSetting
);
3109 dev_err(&udev
->dev
, "failed to restore interface %d "
3110 "altsetting %d (error=%d)\n",
3111 desc
->bInterfaceNumber
,
3112 desc
->bAlternateSetting
,
3122 hub_port_logical_disconnect(parent_hub
, port1
);
3125 EXPORT_SYMBOL_GPL(usb_reset_device
);
3128 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3129 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3130 * @iface: interface bound to the driver making the request (optional)
3132 * Warns all drivers bound to registered interfaces (using their pre_reset
3133 * method), performs the port reset, and then lets the drivers know that
3134 * the reset is over (using their post_reset method).
3136 * Return value is the same as for usb_reset_device().
3138 * The caller must own the device lock. For example, it's safe to use
3139 * this from a driver probe() routine after downloading new firmware.
3140 * For calls that might not occur during probe(), drivers should lock
3141 * the device using usb_lock_device_for_reset().
3143 int usb_reset_composite_device(struct usb_device
*udev
,
3144 struct usb_interface
*iface
)
3148 struct usb_host_config
*config
= udev
->actconfig
;
3150 if (udev
->state
== USB_STATE_NOTATTACHED
||
3151 udev
->state
== USB_STATE_SUSPENDED
) {
3152 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3157 /* Prevent autosuspend during the reset */
3158 usb_autoresume_device(udev
);
3160 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3164 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3165 struct usb_interface
*cintf
= config
->interface
[i
];
3166 struct usb_driver
*drv
;
3168 if (cintf
->dev
.driver
) {
3169 drv
= to_usb_driver(cintf
->dev
.driver
);
3171 (drv
->pre_reset
)(cintf
);
3172 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
3177 ret
= usb_reset_device(udev
);
3180 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3181 struct usb_interface
*cintf
= config
->interface
[i
];
3182 struct usb_driver
*drv
;
3184 if (cintf
->dev
.driver
) {
3185 drv
= to_usb_driver(cintf
->dev
.driver
);
3186 if (drv
->post_reset
)
3187 (drv
->post_reset
)(cintf
);
3188 /* FIXME: Unbind if post_reset returns an error or isn't defined */
3193 usb_autosuspend_device(udev
);
3196 EXPORT_SYMBOL_GPL(usb_reset_composite_device
);