4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/kthread.h>
23 #include <linux/mutex.h>
24 #include <linux/freezer.h>
26 #include <asm/uaccess.h>
27 #include <asm/byteorder.h>
33 /* if we are in debug mode, always announce new devices */
35 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
36 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
41 struct device
*intfdev
; /* the "interface" device */
42 struct usb_device
*hdev
;
44 struct urb
*urb
; /* for interrupt polling pipe */
46 /* buffer for urb ... with extra space in case of babble */
48 dma_addr_t buffer_dma
; /* DMA address for buffer */
50 struct usb_hub_status hub
;
51 struct usb_port_status port
;
52 } *status
; /* buffer for status reports */
53 struct mutex status_mutex
; /* for the status buffer */
55 int error
; /* last reported error */
56 int nerrors
; /* track consecutive errors */
58 struct list_head event_list
; /* hubs w/data or errs ready */
59 unsigned long event_bits
[1]; /* status change bitmask */
60 unsigned long change_bits
[1]; /* ports with logical connect
62 unsigned long busy_bits
[1]; /* ports being reset or
64 #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
65 #error event_bits[] is too short!
68 struct usb_hub_descriptor
*descriptor
; /* class descriptor */
69 struct usb_tt tt
; /* Transaction Translator */
71 unsigned mA_per_port
; /* current for each child */
73 unsigned limited_power
:1;
75 unsigned activating
:1;
76 unsigned disconnected
:1;
78 unsigned has_indicators
:1;
79 u8 indicator
[USB_MAXCHILDREN
];
80 struct delayed_work leds
;
84 /* Protect struct usb_device->state and ->children members
85 * Note: Both are also protected by ->dev.sem, except that ->state can
86 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
87 static DEFINE_SPINLOCK(device_state_lock
);
89 /* khubd's worklist and its lock */
90 static DEFINE_SPINLOCK(hub_event_lock
);
91 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
94 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
96 static struct task_struct
*khubd_task
;
98 /* cycle leds on hubs that aren't blinking for attention */
99 static int blinkenlights
= 0;
100 module_param (blinkenlights
, bool, S_IRUGO
);
101 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
104 * As of 2.6.10 we introduce a new USB device initialization scheme which
105 * closely resembles the way Windows works. Hopefully it will be compatible
106 * with a wider range of devices than the old scheme. However some previously
107 * working devices may start giving rise to "device not accepting address"
108 * errors; if that happens the user can try the old scheme by adjusting the
109 * following module parameters.
111 * For maximum flexibility there are two boolean parameters to control the
112 * hub driver's behavior. On the first initialization attempt, if the
113 * "old_scheme_first" parameter is set then the old scheme will be used,
114 * otherwise the new scheme is used. If that fails and "use_both_schemes"
115 * is set, then the driver will make another attempt, using the other scheme.
117 static int old_scheme_first
= 0;
118 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
119 MODULE_PARM_DESC(old_scheme_first
,
120 "start with the old device initialization scheme");
122 static int use_both_schemes
= 1;
123 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
124 MODULE_PARM_DESC(use_both_schemes
,
125 "try the other device initialization scheme if the "
128 /* Mutual exclusion for EHCI CF initialization. This interferes with
129 * port reset on some companion controllers.
131 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
132 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
135 static inline char *portspeed(int portstatus
)
137 if (portstatus
& (1 << USB_PORT_FEAT_HIGHSPEED
))
139 else if (portstatus
& (1 << USB_PORT_FEAT_LOWSPEED
))
145 /* Note that hdev or one of its children must be locked! */
146 static inline struct usb_hub
*hdev_to_hub(struct usb_device
*hdev
)
148 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
151 /* USB 2.0 spec Section 11.24.4.5 */
152 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
, int size
)
156 for (i
= 0; i
< 3; i
++) {
157 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
158 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
159 USB_DT_HUB
<< 8, 0, data
, size
,
160 USB_CTRL_GET_TIMEOUT
);
161 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
168 * USB 2.0 spec Section 11.24.2.1
170 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
172 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
173 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
177 * USB 2.0 spec Section 11.24.2.2
179 static int clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
181 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
182 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
187 * USB 2.0 spec Section 11.24.2.13
189 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
191 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
192 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
197 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
198 * for info about using port indicators
200 static void set_port_led(
206 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
207 USB_PORT_FEAT_INDICATOR
);
209 dev_dbg (hub
->intfdev
,
210 "port %d indicator %s status %d\n",
212 ({ char *s
; switch (selector
) {
213 case HUB_LED_AMBER
: s
= "amber"; break;
214 case HUB_LED_GREEN
: s
= "green"; break;
215 case HUB_LED_OFF
: s
= "off"; break;
216 case HUB_LED_AUTO
: s
= "auto"; break;
217 default: s
= "??"; break;
222 #define LED_CYCLE_PERIOD ((2*HZ)/3)
224 static void led_work (struct work_struct
*work
)
226 struct usb_hub
*hub
=
227 container_of(work
, struct usb_hub
, leds
.work
);
228 struct usb_device
*hdev
= hub
->hdev
;
230 unsigned changed
= 0;
233 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
236 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
237 unsigned selector
, mode
;
239 /* 30%-50% duty cycle */
241 switch (hub
->indicator
[i
]) {
243 case INDICATOR_CYCLE
:
245 selector
= HUB_LED_AUTO
;
246 mode
= INDICATOR_AUTO
;
248 /* blinking green = sw attention */
249 case INDICATOR_GREEN_BLINK
:
250 selector
= HUB_LED_GREEN
;
251 mode
= INDICATOR_GREEN_BLINK_OFF
;
253 case INDICATOR_GREEN_BLINK_OFF
:
254 selector
= HUB_LED_OFF
;
255 mode
= INDICATOR_GREEN_BLINK
;
257 /* blinking amber = hw attention */
258 case INDICATOR_AMBER_BLINK
:
259 selector
= HUB_LED_AMBER
;
260 mode
= INDICATOR_AMBER_BLINK_OFF
;
262 case INDICATOR_AMBER_BLINK_OFF
:
263 selector
= HUB_LED_OFF
;
264 mode
= INDICATOR_AMBER_BLINK
;
266 /* blink green/amber = reserved */
267 case INDICATOR_ALT_BLINK
:
268 selector
= HUB_LED_GREEN
;
269 mode
= INDICATOR_ALT_BLINK_OFF
;
271 case INDICATOR_ALT_BLINK_OFF
:
272 selector
= HUB_LED_AMBER
;
273 mode
= INDICATOR_ALT_BLINK
;
278 if (selector
!= HUB_LED_AUTO
)
280 set_port_led(hub
, i
+ 1, selector
);
281 hub
->indicator
[i
] = mode
;
283 if (!changed
&& blinkenlights
) {
285 cursor
%= hub
->descriptor
->bNbrPorts
;
286 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
287 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
291 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
294 /* use a short timeout for hub/port status fetches */
295 #define USB_STS_TIMEOUT 1000
296 #define USB_STS_RETRIES 5
299 * USB 2.0 spec Section 11.24.2.6
301 static int get_hub_status(struct usb_device
*hdev
,
302 struct usb_hub_status
*data
)
304 int i
, status
= -ETIMEDOUT
;
306 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
307 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
308 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
309 data
, sizeof(*data
), USB_STS_TIMEOUT
);
315 * USB 2.0 spec Section 11.24.2.7
317 static int get_port_status(struct usb_device
*hdev
, int port1
,
318 struct usb_port_status
*data
)
320 int i
, status
= -ETIMEDOUT
;
322 for (i
= 0; i
< USB_STS_RETRIES
&& status
== -ETIMEDOUT
; i
++) {
323 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
324 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
325 data
, sizeof(*data
), USB_STS_TIMEOUT
);
330 static int hub_port_status(struct usb_hub
*hub
, int port1
,
331 u16
*status
, u16
*change
)
335 mutex_lock(&hub
->status_mutex
);
336 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
338 dev_err(hub
->intfdev
,
339 "%s failed (err = %d)\n", __func__
, ret
);
343 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
344 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
347 mutex_unlock(&hub
->status_mutex
);
351 static void kick_khubd(struct usb_hub
*hub
)
355 /* Suppress autosuspend until khubd runs */
356 to_usb_interface(hub
->intfdev
)->pm_usage_cnt
= 1;
358 spin_lock_irqsave(&hub_event_lock
, flags
);
359 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
360 list_add_tail(&hub
->event_list
, &hub_event_list
);
361 wake_up(&khubd_wait
);
363 spin_unlock_irqrestore(&hub_event_lock
, flags
);
366 void usb_kick_khubd(struct usb_device
*hdev
)
368 /* FIXME: What if hdev isn't bound to the hub driver? */
369 kick_khubd(hdev_to_hub(hdev
));
373 /* completion function, fires on port status changes and various faults */
374 static void hub_irq(struct urb
*urb
)
376 struct usb_hub
*hub
= urb
->context
;
377 int status
= urb
->status
;
382 case -ENOENT
: /* synchronous unlink */
383 case -ECONNRESET
: /* async unlink */
384 case -ESHUTDOWN
: /* hardware going away */
387 default: /* presumably an error */
388 /* Cause a hub reset after 10 consecutive errors */
389 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
390 if ((++hub
->nerrors
< 10) || hub
->error
)
395 /* let khubd handle things */
396 case 0: /* we got data: port status changed */
398 for (i
= 0; i
< urb
->actual_length
; ++i
)
399 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
401 hub
->event_bits
[0] = bits
;
407 /* Something happened, let khubd figure it out */
414 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
415 && status
!= -ENODEV
&& status
!= -EPERM
)
416 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
419 /* USB 2.0 spec Section 11.24.2.3 */
421 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
423 return usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
424 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
429 * enumeration blocks khubd for a long time. we use keventd instead, since
430 * long blocking there is the exception, not the rule. accordingly, HCDs
431 * talking to TTs must queue control transfers (not just bulk and iso), so
432 * both can talk to the same hub concurrently.
434 static void hub_tt_kevent (struct work_struct
*work
)
436 struct usb_hub
*hub
=
437 container_of(work
, struct usb_hub
, tt
.kevent
);
441 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
442 while (--limit
&& !list_empty (&hub
->tt
.clear_list
)) {
443 struct list_head
*temp
;
444 struct usb_tt_clear
*clear
;
445 struct usb_device
*hdev
= hub
->hdev
;
448 temp
= hub
->tt
.clear_list
.next
;
449 clear
= list_entry (temp
, struct usb_tt_clear
, clear_list
);
450 list_del (&clear
->clear_list
);
452 /* drop lock so HCD can concurrently report other TT errors */
453 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
454 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
455 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
459 "clear tt %d (%04x) error %d\n",
460 clear
->tt
, clear
->devinfo
, status
);
463 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
467 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
468 * @udev: the device whose split transaction failed
469 * @pipe: identifies the endpoint of the failed transaction
471 * High speed HCDs use this to tell the hub driver that some split control or
472 * bulk transaction failed in a way that requires clearing internal state of
473 * a transaction translator. This is normally detected (and reported) from
476 * It may not be possible for that hub to handle additional full (or low)
477 * speed transactions until that state is fully cleared out.
479 void usb_hub_tt_clear_buffer (struct usb_device
*udev
, int pipe
)
481 struct usb_tt
*tt
= udev
->tt
;
483 struct usb_tt_clear
*clear
;
485 /* we've got to cope with an arbitrary number of pending TT clears,
486 * since each TT has "at least two" buffers that can need it (and
487 * there can be many TTs per hub). even if they're uncommon.
489 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
490 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
491 /* FIXME recover somehow ... RESET_TT? */
495 /* info that CLEAR_TT_BUFFER needs */
496 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
497 clear
->devinfo
= usb_pipeendpoint (pipe
);
498 clear
->devinfo
|= udev
->devnum
<< 4;
499 clear
->devinfo
|= usb_pipecontrol (pipe
)
500 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
501 : (USB_ENDPOINT_XFER_BULK
<< 11);
502 if (usb_pipein (pipe
))
503 clear
->devinfo
|= 1 << 15;
505 /* tell keventd to clear state for this TT */
506 spin_lock_irqsave (&tt
->lock
, flags
);
507 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
508 schedule_work (&tt
->kevent
);
509 spin_unlock_irqrestore (&tt
->lock
, flags
);
511 EXPORT_SYMBOL_GPL(usb_hub_tt_clear_buffer
);
513 static void hub_power_on(struct usb_hub
*hub
)
516 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
517 u16 wHubCharacteristics
=
518 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
520 /* Enable power on each port. Some hubs have reserved values
521 * of LPSM (> 2) in their descriptors, even though they are
522 * USB 2.0 hubs. Some hubs do not implement port-power switching
523 * but only emulate it. In all cases, the ports won't work
524 * unless we send these messages to the hub.
526 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
527 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
529 dev_dbg(hub
->intfdev
, "trying to enable port power on "
530 "non-switchable hub\n");
531 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
532 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
534 /* Wait at least 100 msec for power to become stable */
535 msleep(max(pgood_delay
, (unsigned) 100));
538 static void hub_quiesce(struct usb_hub
*hub
)
540 /* (nonblocking) khubd and related activity won't re-trigger */
544 /* (blocking) stop khubd and related activity */
545 usb_kill_urb(hub
->urb
);
546 if (hub
->has_indicators
)
547 cancel_delayed_work_sync(&hub
->leds
);
549 cancel_work_sync(&hub
->tt
.kevent
);
552 static void hub_activate(struct usb_hub
*hub
)
559 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
561 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
562 if (hub
->has_indicators
&& blinkenlights
)
563 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
565 /* scan all ports ASAP */
569 static int hub_hub_status(struct usb_hub
*hub
,
570 u16
*status
, u16
*change
)
574 mutex_lock(&hub
->status_mutex
);
575 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
577 dev_err (hub
->intfdev
,
578 "%s failed (err = %d)\n", __func__
, ret
);
580 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
581 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
584 mutex_unlock(&hub
->status_mutex
);
588 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
590 struct usb_device
*hdev
= hub
->hdev
;
593 if (hdev
->children
[port1
-1] && set_state
)
594 usb_set_device_state(hdev
->children
[port1
-1],
595 USB_STATE_NOTATTACHED
);
597 ret
= clear_port_feature(hdev
, port1
, USB_PORT_FEAT_ENABLE
);
599 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
605 * Disable a port and mark a logical connnect-change event, so that some
606 * time later khubd will disconnect() any existing usb_device on the port
607 * and will re-enumerate if there actually is a device attached.
609 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
611 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
612 hub_port_disable(hub
, port1
, 1);
614 /* FIXME let caller ask to power down the port:
615 * - some devices won't enumerate without a VBUS power cycle
616 * - SRP saves power that way
617 * - ... new call, TBD ...
618 * That's easy if this hub can switch power per-port, and
619 * khubd reactivates the port later (timer, SRP, etc).
620 * Powerdown must be optional, because of reset/DFU.
623 set_bit(port1
, hub
->change_bits
);
627 /* caller has locked the hub device */
628 static void hub_stop(struct usb_hub
*hub
)
630 struct usb_device
*hdev
= hub
->hdev
;
633 /* Disconnect all the children */
634 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
635 if (hdev
->children
[i
])
636 usb_disconnect(&hdev
->children
[i
]);
643 #define HUB_RESET_RESUME 3
647 /* Try to identify which devices need USB-PERSIST handling */
648 static int persistent_device(struct usb_device
*udev
)
652 struct usb_host_config
*actconfig
;
654 /* Explicitly not marked persistent? */
655 if (!udev
->persist_enabled
)
658 /* No active config? */
659 actconfig
= udev
->actconfig
;
663 /* FIXME! We should check whether it's open here or not! */
666 * Check that all the interface drivers have a
667 * 'reset_resume' entrypoint
670 for (i
= 0; i
< actconfig
->desc
.bNumInterfaces
; i
++) {
671 struct usb_interface
*intf
;
672 struct usb_driver
*driver
;
674 intf
= actconfig
->interface
[i
];
675 if (!intf
->dev
.driver
)
677 driver
= to_usb_driver(intf
->dev
.driver
);
678 if (!driver
->reset_resume
)
681 * We have at least one driver, and that one
682 * has a reset_resume method.
689 static void hub_restart(struct usb_hub
*hub
, int type
)
691 struct usb_device
*hdev
= hub
->hdev
;
694 /* Check each of the children to see if they require
695 * USB-PERSIST handling or disconnection. Also check
696 * each unoccupied port to make sure it is still disabled.
698 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
699 struct usb_device
*udev
= hdev
->children
[port1
-1];
701 u16 portstatus
, portchange
;
703 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
704 if (type
!= HUB_RESET
) {
705 status
= hub_port_status(hub
, port1
,
706 &portstatus
, &portchange
);
707 if (status
== 0 && (portstatus
&
708 USB_PORT_STAT_ENABLE
))
709 clear_port_feature(hdev
, port1
,
710 USB_PORT_FEAT_ENABLE
);
715 /* Was the power session lost while we were suspended? */
717 case HUB_RESET_RESUME
:
719 portchange
= USB_PORT_STAT_C_CONNECTION
;
724 status
= hub_port_status(hub
, port1
,
725 &portstatus
, &portchange
);
729 /* For "USB_PERSIST"-enabled children we must
730 * mark the child device for reset-resume and
731 * turn off the various status changes to prevent
732 * khubd from disconnecting it later.
734 if (status
== 0 && !(portstatus
& USB_PORT_STAT_ENABLE
) &&
735 persistent_device(udev
)) {
736 if (portchange
& USB_PORT_STAT_C_ENABLE
)
737 clear_port_feature(hub
->hdev
, port1
,
738 USB_PORT_FEAT_C_ENABLE
);
739 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
740 clear_port_feature(hub
->hdev
, port1
,
741 USB_PORT_FEAT_C_CONNECTION
);
742 udev
->reset_resume
= 1;
745 /* Otherwise for a reset_resume we must disconnect the child,
746 * but as we may not lock the child device here
747 * we have to do a "logical" disconnect.
749 else if (type
== HUB_RESET_RESUME
)
750 hub_port_logical_disconnect(hub
, port1
);
756 #endif /* CONFIG_PM */
758 /* caller has locked the hub device */
759 static int hub_pre_reset(struct usb_interface
*intf
)
761 struct usb_hub
*hub
= usb_get_intfdata(intf
);
767 /* caller has locked the hub device */
768 static int hub_post_reset(struct usb_interface
*intf
)
770 struct usb_hub
*hub
= usb_get_intfdata(intf
);
777 static int hub_configure(struct usb_hub
*hub
,
778 struct usb_endpoint_descriptor
*endpoint
)
780 struct usb_device
*hdev
= hub
->hdev
;
781 struct device
*hub_dev
= hub
->intfdev
;
782 u16 hubstatus
, hubchange
;
783 u16 wHubCharacteristics
;
788 hub
->buffer
= usb_buffer_alloc(hdev
, sizeof(*hub
->buffer
), GFP_KERNEL
,
791 message
= "can't allocate hub irq buffer";
796 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
798 message
= "can't kmalloc hub status buffer";
802 mutex_init(&hub
->status_mutex
);
804 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
805 if (!hub
->descriptor
) {
806 message
= "can't kmalloc hub descriptor";
811 /* Request the entire hub descriptor.
812 * hub->descriptor can handle USB_MAXCHILDREN ports,
813 * but the hub can/will return fewer bytes here.
815 ret
= get_hub_descriptor(hdev
, hub
->descriptor
,
816 sizeof(*hub
->descriptor
));
818 message
= "can't read hub descriptor";
820 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
821 message
= "hub has too many ports!";
826 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
827 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
828 (hdev
->maxchild
== 1) ? "" : "s");
830 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
832 if (wHubCharacteristics
& HUB_CHAR_COMPOUND
) {
834 char portstr
[USB_MAXCHILDREN
+ 1];
836 for (i
= 0; i
< hdev
->maxchild
; i
++)
837 portstr
[i
] = hub
->descriptor
->DeviceRemovable
838 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
840 portstr
[hdev
->maxchild
] = 0;
841 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
843 dev_dbg(hub_dev
, "standalone hub\n");
845 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
847 dev_dbg(hub_dev
, "ganged power switching\n");
850 dev_dbg(hub_dev
, "individual port power switching\n");
854 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
858 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
860 dev_dbg(hub_dev
, "global over-current protection\n");
863 dev_dbg(hub_dev
, "individual port over-current protection\n");
867 dev_dbg(hub_dev
, "no over-current protection\n");
871 spin_lock_init (&hub
->tt
.lock
);
872 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
873 INIT_WORK (&hub
->tt
.kevent
, hub_tt_kevent
);
874 switch (hdev
->descriptor
.bDeviceProtocol
) {
878 dev_dbg(hub_dev
, "Single TT\n");
882 ret
= usb_set_interface(hdev
, 0, 1);
884 dev_dbg(hub_dev
, "TT per port\n");
887 dev_err(hub_dev
, "Using single TT (err %d)\n",
892 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
893 hdev
->descriptor
.bDeviceProtocol
);
897 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
898 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
899 case HUB_TTTT_8_BITS
:
900 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
901 hub
->tt
.think_time
= 666;
902 dev_dbg(hub_dev
, "TT requires at most %d "
903 "FS bit times (%d ns)\n",
904 8, hub
->tt
.think_time
);
907 case HUB_TTTT_16_BITS
:
908 hub
->tt
.think_time
= 666 * 2;
909 dev_dbg(hub_dev
, "TT requires at most %d "
910 "FS bit times (%d ns)\n",
911 16, hub
->tt
.think_time
);
913 case HUB_TTTT_24_BITS
:
914 hub
->tt
.think_time
= 666 * 3;
915 dev_dbg(hub_dev
, "TT requires at most %d "
916 "FS bit times (%d ns)\n",
917 24, hub
->tt
.think_time
);
919 case HUB_TTTT_32_BITS
:
920 hub
->tt
.think_time
= 666 * 4;
921 dev_dbg(hub_dev
, "TT requires at most %d "
922 "FS bit times (%d ns)\n",
923 32, hub
->tt
.think_time
);
927 /* probe() zeroes hub->indicator[] */
928 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
929 hub
->has_indicators
= 1;
930 dev_dbg(hub_dev
, "Port indicators are supported\n");
933 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
934 hub
->descriptor
->bPwrOn2PwrGood
* 2);
936 /* power budgeting mostly matters with bus-powered hubs,
937 * and battery-powered root hubs (may provide just 8 mA).
939 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
941 message
= "can't get hub status";
944 le16_to_cpus(&hubstatus
);
945 if (hdev
== hdev
->bus
->root_hub
) {
946 if (hdev
->bus_mA
== 0 || hdev
->bus_mA
>= 500)
947 hub
->mA_per_port
= 500;
949 hub
->mA_per_port
= hdev
->bus_mA
;
950 hub
->limited_power
= 1;
952 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
953 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
954 hub
->descriptor
->bHubContrCurrent
);
955 hub
->limited_power
= 1;
956 if (hdev
->maxchild
> 0) {
957 int remaining
= hdev
->bus_mA
-
958 hub
->descriptor
->bHubContrCurrent
;
960 if (remaining
< hdev
->maxchild
* 100)
962 "insufficient power available "
963 "to use all downstream ports\n");
964 hub
->mA_per_port
= 100; /* 7.2.1.1 */
966 } else { /* Self-powered external hub */
967 /* FIXME: What about battery-powered external hubs that
968 * provide less current per port? */
969 hub
->mA_per_port
= 500;
971 if (hub
->mA_per_port
< 500)
972 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
975 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
977 message
= "can't get hub status";
981 /* local power status reports aren't always correct */
982 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
983 dev_dbg(hub_dev
, "local power source is %s\n",
984 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
985 ? "lost (inactive)" : "good");
987 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
988 dev_dbg(hub_dev
, "%sover-current condition exists\n",
989 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
991 /* set up the interrupt endpoint
992 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
993 * bytes as USB2.0[11.12.3] says because some hubs are known
994 * to send more data (and thus cause overflow). For root hubs,
995 * maxpktsize is defined in hcd.c's fake endpoint descriptors
996 * to be big enough for at least USB_MAXCHILDREN ports. */
997 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
998 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
1000 if (maxp
> sizeof(*hub
->buffer
))
1001 maxp
= sizeof(*hub
->buffer
);
1003 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
1005 message
= "couldn't allocate interrupt urb";
1010 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
1011 hub
, endpoint
->bInterval
);
1012 hub
->urb
->transfer_dma
= hub
->buffer_dma
;
1013 hub
->urb
->transfer_flags
|= URB_NO_TRANSFER_DMA_MAP
;
1015 /* maybe cycle the hub leds */
1016 if (hub
->has_indicators
&& blinkenlights
)
1017 hub
->indicator
[0] = INDICATOR_CYCLE
;
1024 dev_err (hub_dev
, "config failed, %s (err %d)\n",
1026 /* hub_disconnect() frees urb and descriptor */
1030 static void hub_release(struct kref
*kref
)
1032 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1034 usb_put_intf(to_usb_interface(hub
->intfdev
));
1038 static unsigned highspeed_hubs
;
1040 static void hub_disconnect(struct usb_interface
*intf
)
1042 struct usb_hub
*hub
= usb_get_intfdata (intf
);
1044 /* Take the hub off the event list and don't let it be added again */
1045 spin_lock_irq(&hub_event_lock
);
1046 list_del_init(&hub
->event_list
);
1047 hub
->disconnected
= 1;
1048 spin_unlock_irq(&hub_event_lock
);
1050 /* Disconnect all children and quiesce the hub */
1054 usb_set_intfdata (intf
, NULL
);
1056 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1059 usb_free_urb(hub
->urb
);
1060 kfree(hub
->descriptor
);
1062 usb_buffer_free(hub
->hdev
, sizeof(*hub
->buffer
), hub
->buffer
,
1065 kref_put(&hub
->kref
, hub_release
);
1068 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1070 struct usb_host_interface
*desc
;
1071 struct usb_endpoint_descriptor
*endpoint
;
1072 struct usb_device
*hdev
;
1073 struct usb_hub
*hub
;
1075 desc
= intf
->cur_altsetting
;
1076 hdev
= interface_to_usbdev(intf
);
1078 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1080 dev_warn(&intf
->dev
, "ignoring external hub\n");
1085 /* Some hubs have a subclass of 1, which AFAICT according to the */
1086 /* specs is not defined, but it works */
1087 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1088 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1090 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
1094 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1095 if (desc
->desc
.bNumEndpoints
!= 1)
1096 goto descriptor_error
;
1098 endpoint
= &desc
->endpoint
[0].desc
;
1100 /* If it's not an interrupt in endpoint, we'd better punt! */
1101 if (!usb_endpoint_is_int_in(endpoint
))
1102 goto descriptor_error
;
1104 /* We found a hub */
1105 dev_info (&intf
->dev
, "USB hub found\n");
1107 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1109 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1113 kref_init(&hub
->kref
);
1114 INIT_LIST_HEAD(&hub
->event_list
);
1115 hub
->intfdev
= &intf
->dev
;
1117 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1120 usb_set_intfdata (intf
, hub
);
1121 intf
->needs_remote_wakeup
= 1;
1123 if (hdev
->speed
== USB_SPEED_HIGH
)
1126 if (hub_configure(hub
, endpoint
) >= 0)
1129 hub_disconnect (intf
);
1134 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1136 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1138 /* assert ifno == 0 (part of hub spec) */
1140 case USBDEVFS_HUB_PORTINFO
: {
1141 struct usbdevfs_hub_portinfo
*info
= user_data
;
1144 spin_lock_irq(&device_state_lock
);
1145 if (hdev
->devnum
<= 0)
1148 info
->nports
= hdev
->maxchild
;
1149 for (i
= 0; i
< info
->nports
; i
++) {
1150 if (hdev
->children
[i
] == NULL
)
1154 hdev
->children
[i
]->devnum
;
1157 spin_unlock_irq(&device_state_lock
);
1159 return info
->nports
+ 1;
1168 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1172 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1173 if (udev
->children
[i
])
1174 recursively_mark_NOTATTACHED(udev
->children
[i
]);
1176 if (udev
->state
== USB_STATE_SUSPENDED
) {
1177 udev
->discon_suspended
= 1;
1178 udev
->active_duration
-= jiffies
;
1180 udev
->state
= USB_STATE_NOTATTACHED
;
1184 * usb_set_device_state - change a device's current state (usbcore, hcds)
1185 * @udev: pointer to device whose state should be changed
1186 * @new_state: new state value to be stored
1188 * udev->state is _not_ fully protected by the device lock. Although
1189 * most transitions are made only while holding the lock, the state can
1190 * can change to USB_STATE_NOTATTACHED at almost any time. This
1191 * is so that devices can be marked as disconnected as soon as possible,
1192 * without having to wait for any semaphores to be released. As a result,
1193 * all changes to any device's state must be protected by the
1194 * device_state_lock spinlock.
1196 * Once a device has been added to the device tree, all changes to its state
1197 * should be made using this routine. The state should _not_ be set directly.
1199 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1200 * Otherwise udev->state is set to new_state, and if new_state is
1201 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1202 * to USB_STATE_NOTATTACHED.
1204 void usb_set_device_state(struct usb_device
*udev
,
1205 enum usb_device_state new_state
)
1207 unsigned long flags
;
1209 spin_lock_irqsave(&device_state_lock
, flags
);
1210 if (udev
->state
== USB_STATE_NOTATTACHED
)
1212 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1214 /* root hub wakeup capabilities are managed out-of-band
1215 * and may involve silicon errata ... ignore them here.
1218 if (udev
->state
== USB_STATE_SUSPENDED
1219 || new_state
== USB_STATE_SUSPENDED
)
1220 ; /* No change to wakeup settings */
1221 else if (new_state
== USB_STATE_CONFIGURED
)
1222 device_init_wakeup(&udev
->dev
,
1223 (udev
->actconfig
->desc
.bmAttributes
1224 & USB_CONFIG_ATT_WAKEUP
));
1226 device_init_wakeup(&udev
->dev
, 0);
1228 if (udev
->state
== USB_STATE_SUSPENDED
&&
1229 new_state
!= USB_STATE_SUSPENDED
)
1230 udev
->active_duration
-= jiffies
;
1231 else if (new_state
== USB_STATE_SUSPENDED
&&
1232 udev
->state
!= USB_STATE_SUSPENDED
)
1233 udev
->active_duration
+= jiffies
;
1234 udev
->state
= new_state
;
1236 recursively_mark_NOTATTACHED(udev
);
1237 spin_unlock_irqrestore(&device_state_lock
, flags
);
1241 * WUSB devices are simple: they have no hubs behind, so the mapping
1242 * device <-> virtual port number becomes 1:1. Why? to simplify the
1243 * life of the device connection logic in
1244 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1245 * handshake we need to assign a temporary address in the unauthorized
1246 * space. For simplicity we use the first virtual port number found to
1247 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1248 * and that becomes it's address [X < 128] or its unauthorized address
1251 * We add 1 as an offset to the one-based USB-stack port number
1252 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1253 * 0 is reserved by USB for default address; (b) Linux's USB stack
1254 * uses always #1 for the root hub of the controller. So USB stack's
1255 * port #1, which is wusb virtual-port #0 has address #2.
1257 static void choose_address(struct usb_device
*udev
)
1260 struct usb_bus
*bus
= udev
->bus
;
1262 /* If khubd ever becomes multithreaded, this will need a lock */
1264 devnum
= udev
->portnum
+ 1;
1265 BUG_ON(test_bit(devnum
, bus
->devmap
.devicemap
));
1267 /* Try to allocate the next devnum beginning at
1268 * bus->devnum_next. */
1269 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
1272 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
,
1274 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
1277 set_bit(devnum
, bus
->devmap
.devicemap
);
1278 udev
->devnum
= devnum
;
1282 static void release_address(struct usb_device
*udev
)
1284 if (udev
->devnum
> 0) {
1285 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
1290 static void update_address(struct usb_device
*udev
, int devnum
)
1292 /* The address for a WUSB device is managed by wusbcore. */
1294 udev
->devnum
= devnum
;
1297 #ifdef CONFIG_USB_SUSPEND
1299 static void usb_stop_pm(struct usb_device
*udev
)
1301 /* Synchronize with the ksuspend thread to prevent any more
1302 * autosuspend requests from being submitted, and decrement
1303 * the parent's count of unsuspended children.
1306 if (udev
->parent
&& !udev
->discon_suspended
)
1307 usb_autosuspend_device(udev
->parent
);
1308 usb_pm_unlock(udev
);
1310 /* Stop any autosuspend requests already submitted */
1311 cancel_rearming_delayed_work(&udev
->autosuspend
);
1316 static inline void usb_stop_pm(struct usb_device
*udev
)
1322 * usb_disconnect - disconnect a device (usbcore-internal)
1323 * @pdev: pointer to device being disconnected
1324 * Context: !in_interrupt ()
1326 * Something got disconnected. Get rid of it and all of its children.
1328 * If *pdev is a normal device then the parent hub must already be locked.
1329 * If *pdev is a root hub then this routine will acquire the
1330 * usb_bus_list_lock on behalf of the caller.
1332 * Only hub drivers (including virtual root hub drivers for host
1333 * controllers) should ever call this.
1335 * This call is synchronous, and may not be used in an interrupt context.
1337 void usb_disconnect(struct usb_device
**pdev
)
1339 struct usb_device
*udev
= *pdev
;
1343 pr_debug ("%s nodev\n", __func__
);
1347 /* mark the device as inactive, so any further urb submissions for
1348 * this device (and any of its children) will fail immediately.
1349 * this quiesces everyting except pending urbs.
1351 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1352 dev_info (&udev
->dev
, "USB disconnect, address %d\n", udev
->devnum
);
1354 usb_lock_device(udev
);
1356 /* Free up all the children before we remove this device */
1357 for (i
= 0; i
< USB_MAXCHILDREN
; i
++) {
1358 if (udev
->children
[i
])
1359 usb_disconnect(&udev
->children
[i
]);
1362 /* deallocate hcd/hardware state ... nuking all pending urbs and
1363 * cleaning up all state associated with the current configuration
1364 * so that the hardware is now fully quiesced.
1366 dev_dbg (&udev
->dev
, "unregistering device\n");
1367 usb_disable_device(udev
, 0);
1369 usb_unlock_device(udev
);
1371 /* Remove the device-specific files from sysfs. This must be
1372 * done with udev unlocked, because some of the attribute
1373 * routines try to acquire the device lock.
1375 usb_remove_sysfs_dev_files(udev
);
1377 /* Unregister the device. The device driver is responsible
1378 * for removing the device files from usbfs and sysfs and for
1379 * de-configuring the device.
1381 device_del(&udev
->dev
);
1383 /* Free the device number and delete the parent's children[]
1384 * (or root_hub) pointer.
1386 release_address(udev
);
1388 /* Avoid races with recursively_mark_NOTATTACHED() */
1389 spin_lock_irq(&device_state_lock
);
1391 spin_unlock_irq(&device_state_lock
);
1395 put_device(&udev
->dev
);
1398 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
1399 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
1403 dev_printk(KERN_INFO
, &udev
->dev
, "%s: %s\n", id
, string
);
1406 static void announce_device(struct usb_device
*udev
)
1408 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
1409 le16_to_cpu(udev
->descriptor
.idVendor
),
1410 le16_to_cpu(udev
->descriptor
.idProduct
));
1411 dev_info(&udev
->dev
, "New USB device strings: Mfr=%d, Product=%d, "
1412 "SerialNumber=%d\n",
1413 udev
->descriptor
.iManufacturer
,
1414 udev
->descriptor
.iProduct
,
1415 udev
->descriptor
.iSerialNumber
);
1416 show_string(udev
, "Product", udev
->product
);
1417 show_string(udev
, "Manufacturer", udev
->manufacturer
);
1418 show_string(udev
, "SerialNumber", udev
->serial
);
1421 static inline void announce_device(struct usb_device
*udev
) { }
1424 #ifdef CONFIG_USB_OTG
1425 #include "otg_whitelist.h"
1429 * usb_configure_device_otg - FIXME (usbcore-internal)
1430 * @udev: newly addressed device (in ADDRESS state)
1432 * Do configuration for On-The-Go devices
1434 static int usb_configure_device_otg(struct usb_device
*udev
)
1438 #ifdef CONFIG_USB_OTG
1440 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1441 * to wake us after we've powered off VBUS; and HNP, switching roles
1442 * "host" to "peripheral". The OTG descriptor helps figure this out.
1444 if (!udev
->bus
->is_b_host
1446 && udev
->parent
== udev
->bus
->root_hub
) {
1447 struct usb_otg_descriptor
*desc
= 0;
1448 struct usb_bus
*bus
= udev
->bus
;
1450 /* descriptor may appear anywhere in config */
1451 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
1452 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
1453 USB_DT_OTG
, (void **) &desc
) == 0) {
1454 if (desc
->bmAttributes
& USB_OTG_HNP
) {
1455 unsigned port1
= udev
->portnum
;
1457 dev_info(&udev
->dev
,
1458 "Dual-Role OTG device on %sHNP port\n",
1459 (port1
== bus
->otg_port
)
1462 /* enable HNP before suspend, it's simpler */
1463 if (port1
== bus
->otg_port
)
1464 bus
->b_hnp_enable
= 1;
1465 err
= usb_control_msg(udev
,
1466 usb_sndctrlpipe(udev
, 0),
1467 USB_REQ_SET_FEATURE
, 0,
1469 ? USB_DEVICE_B_HNP_ENABLE
1470 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
1471 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
1473 /* OTG MESSAGE: report errors here,
1474 * customize to match your product.
1476 dev_info(&udev
->dev
,
1477 "can't set HNP mode; %d\n",
1479 bus
->b_hnp_enable
= 0;
1485 if (!is_targeted(udev
)) {
1487 /* Maybe it can talk to us, though we can't talk to it.
1488 * (Includes HNP test device.)
1490 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
1491 err
= usb_port_suspend(udev
);
1493 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
1505 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1506 * @udev: newly addressed device (in ADDRESS state)
1508 * This is only called by usb_new_device() and usb_authorize_device()
1509 * and FIXME -- all comments that apply to them apply here wrt to
1512 * If the device is WUSB and not authorized, we don't attempt to read
1513 * the string descriptors, as they will be errored out by the device
1514 * until it has been authorized.
1516 static int usb_configure_device(struct usb_device
*udev
)
1520 if (udev
->config
== NULL
) {
1521 err
= usb_get_configuration(udev
);
1523 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
1528 if (udev
->wusb
== 1 && udev
->authorized
== 0) {
1529 udev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1530 udev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1531 udev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1534 /* read the standard strings and cache them if present */
1535 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
1536 udev
->manufacturer
= usb_cache_string(udev
,
1537 udev
->descriptor
.iManufacturer
);
1538 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
1540 err
= usb_configure_device_otg(udev
);
1547 * usb_new_device - perform initial device setup (usbcore-internal)
1548 * @udev: newly addressed device (in ADDRESS state)
1550 * This is called with devices which have been enumerated, but not yet
1551 * configured. The device descriptor is available, but not descriptors
1552 * for any device configuration. The caller must have locked either
1553 * the parent hub (if udev is a normal device) or else the
1554 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1555 * udev has already been installed, but udev is not yet visible through
1556 * sysfs or other filesystem code.
1558 * It will return if the device is configured properly or not. Zero if
1559 * the interface was registered with the driver core; else a negative
1562 * This call is synchronous, and may not be used in an interrupt context.
1564 * Only the hub driver or root-hub registrar should ever call this.
1566 int usb_new_device(struct usb_device
*udev
)
1570 usb_detect_quirks(udev
); /* Determine quirks */
1571 err
= usb_configure_device(udev
); /* detect & probe dev/intfs */
1574 /* export the usbdev device-node for libusb */
1575 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
1576 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
1578 /* Increment the parent's count of unsuspended children */
1580 usb_autoresume_device(udev
->parent
);
1582 /* Register the device. The device driver is responsible
1583 * for adding the device files to sysfs and for configuring
1586 err
= device_add(&udev
->dev
);
1588 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
1592 /* put device-specific files into sysfs */
1593 usb_create_sysfs_dev_files(udev
);
1595 /* Tell the world! */
1596 announce_device(udev
);
1600 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1606 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
1607 * @usb_dev: USB device
1609 * Move the USB device to a very basic state where interfaces are disabled
1610 * and the device is in fact unconfigured and unusable.
1612 * We share a lock (that we have) with device_del(), so we need to
1615 int usb_deauthorize_device(struct usb_device
*usb_dev
)
1618 usb_lock_device(usb_dev
);
1619 if (usb_dev
->authorized
== 0)
1620 goto out_unauthorized
;
1621 usb_dev
->authorized
= 0;
1622 usb_set_configuration(usb_dev
, -1);
1623 usb_dev
->product
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1624 usb_dev
->manufacturer
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1625 usb_dev
->serial
= kstrdup("n/a (unauthorized)", GFP_KERNEL
);
1626 kfree(usb_dev
->config
);
1627 usb_dev
->config
= NULL
;
1628 for (cnt
= 0; cnt
< usb_dev
->descriptor
.bNumConfigurations
; cnt
++)
1629 kfree(usb_dev
->rawdescriptors
[cnt
]);
1630 usb_dev
->descriptor
.bNumConfigurations
= 0;
1631 kfree(usb_dev
->rawdescriptors
);
1633 usb_unlock_device(usb_dev
);
1638 int usb_authorize_device(struct usb_device
*usb_dev
)
1641 usb_lock_device(usb_dev
);
1642 if (usb_dev
->authorized
== 1)
1643 goto out_authorized
;
1644 kfree(usb_dev
->product
);
1645 usb_dev
->product
= NULL
;
1646 kfree(usb_dev
->manufacturer
);
1647 usb_dev
->manufacturer
= NULL
;
1648 kfree(usb_dev
->serial
);
1649 usb_dev
->serial
= NULL
;
1650 result
= usb_autoresume_device(usb_dev
);
1652 dev_err(&usb_dev
->dev
,
1653 "can't autoresume for authorization: %d\n", result
);
1654 goto error_autoresume
;
1656 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
1658 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
1659 "authorization: %d\n", result
);
1660 goto error_device_descriptor
;
1662 usb_dev
->authorized
= 1;
1663 result
= usb_configure_device(usb_dev
);
1665 goto error_configure
;
1666 /* Choose and set the configuration. This registers the interfaces
1667 * with the driver core and lets interface drivers bind to them.
1669 c
= usb_choose_configuration(usb_dev
);
1671 result
= usb_set_configuration(usb_dev
, c
);
1673 dev_err(&usb_dev
->dev
,
1674 "can't set config #%d, error %d\n", c
, result
);
1675 /* This need not be fatal. The user can try to
1676 * set other configurations. */
1679 dev_info(&usb_dev
->dev
, "authorized to connect\n");
1681 error_device_descriptor
:
1684 usb_unlock_device(usb_dev
); // complements locktree
1689 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1690 static unsigned hub_is_wusb(struct usb_hub
*hub
)
1692 struct usb_hcd
*hcd
;
1693 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
1695 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
1696 return hcd
->wireless
;
1700 #define PORT_RESET_TRIES 5
1701 #define SET_ADDRESS_TRIES 2
1702 #define GET_DESCRIPTOR_TRIES 2
1703 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1704 #define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1706 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1707 #define HUB_SHORT_RESET_TIME 10
1708 #define HUB_LONG_RESET_TIME 200
1709 #define HUB_RESET_TIMEOUT 500
1711 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
1712 struct usb_device
*udev
, unsigned int delay
)
1714 int delay_time
, ret
;
1718 for (delay_time
= 0;
1719 delay_time
< HUB_RESET_TIMEOUT
;
1720 delay_time
+= delay
) {
1721 /* wait to give the device a chance to reset */
1724 /* read and decode port status */
1725 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1729 /* Device went away? */
1730 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
1733 /* bomb out completely if the connection bounced */
1734 if ((portchange
& USB_PORT_STAT_C_CONNECTION
))
1737 /* if we`ve finished resetting, then break out of the loop */
1738 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
1739 (portstatus
& USB_PORT_STAT_ENABLE
)) {
1740 if (hub_is_wusb(hub
))
1741 udev
->speed
= USB_SPEED_VARIABLE
;
1742 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
1743 udev
->speed
= USB_SPEED_HIGH
;
1744 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
1745 udev
->speed
= USB_SPEED_LOW
;
1747 udev
->speed
= USB_SPEED_FULL
;
1751 /* switch to the long delay after two short delay failures */
1752 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
1753 delay
= HUB_LONG_RESET_TIME
;
1755 dev_dbg (hub
->intfdev
,
1756 "port %d not reset yet, waiting %dms\n",
1763 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
1764 struct usb_device
*udev
, unsigned int delay
)
1768 /* Block EHCI CF initialization during the port reset.
1769 * Some companion controllers don't like it when they mix.
1771 down_read(&ehci_cf_port_reset_rwsem
);
1773 /* Reset the port */
1774 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
1775 status
= set_port_feature(hub
->hdev
,
1776 port1
, USB_PORT_FEAT_RESET
);
1778 dev_err(hub
->intfdev
,
1779 "cannot reset port %d (err = %d)\n",
1782 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
);
1783 if (status
&& status
!= -ENOTCONN
)
1784 dev_dbg(hub
->intfdev
,
1785 "port_wait_reset: err = %d\n",
1789 /* return on disconnect or reset */
1792 /* TRSTRCY = 10 ms; plus some extra */
1794 update_address(udev
, 0);
1798 clear_port_feature(hub
->hdev
,
1799 port1
, USB_PORT_FEAT_C_RESET
);
1800 /* FIXME need disconnect() for NOTATTACHED device */
1801 usb_set_device_state(udev
, status
1802 ? USB_STATE_NOTATTACHED
1803 : USB_STATE_DEFAULT
);
1807 dev_dbg (hub
->intfdev
,
1808 "port %d not enabled, trying reset again...\n",
1810 delay
= HUB_LONG_RESET_TIME
;
1813 dev_err (hub
->intfdev
,
1814 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1818 up_read(&ehci_cf_port_reset_rwsem
);
1824 #ifdef CONFIG_USB_SUSPEND
1827 * usb_port_suspend - suspend a usb device's upstream port
1828 * @udev: device that's no longer in active use, not a root hub
1829 * Context: must be able to sleep; device not locked; pm locks held
1831 * Suspends a USB device that isn't in active use, conserving power.
1832 * Devices may wake out of a suspend, if anything important happens,
1833 * using the remote wakeup mechanism. They may also be taken out of
1834 * suspend by the host, using usb_port_resume(). It's also routine
1835 * to disconnect devices while they are suspended.
1837 * This only affects the USB hardware for a device; its interfaces
1838 * (and, for hubs, child devices) must already have been suspended.
1840 * Selective port suspend reduces power; most suspended devices draw
1841 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1842 * All devices below the suspended port are also suspended.
1844 * Devices leave suspend state when the host wakes them up. Some devices
1845 * also support "remote wakeup", where the device can activate the USB
1846 * tree above them to deliver data, such as a keypress or packet. In
1847 * some cases, this wakes the USB host.
1849 * Suspending OTG devices may trigger HNP, if that's been enabled
1850 * between a pair of dual-role devices. That will change roles, such
1851 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1853 * Devices on USB hub ports have only one "suspend" state, corresponding
1854 * to ACPI D2, "may cause the device to lose some context".
1855 * State transitions include:
1857 * - suspend, resume ... when the VBUS power link stays live
1858 * - suspend, disconnect ... VBUS lost
1860 * Once VBUS drop breaks the circuit, the port it's using has to go through
1861 * normal re-enumeration procedures, starting with enabling VBUS power.
1862 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1863 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1864 * timer, no SRP, no requests through sysfs.
1866 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1867 * the root hub for their bus goes into global suspend ... so we don't
1868 * (falsely) update the device power state to say it suspended.
1870 * Returns 0 on success, else negative errno.
1872 int usb_port_suspend(struct usb_device
*udev
)
1874 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
1875 int port1
= udev
->portnum
;
1878 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1880 /* enable remote wakeup when appropriate; this lets the device
1881 * wake up the upstream hub (including maybe the root hub).
1883 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1884 * we don't explicitly enable it here.
1886 if (udev
->do_remote_wakeup
) {
1887 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1888 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
1889 USB_DEVICE_REMOTE_WAKEUP
, 0,
1891 USB_CTRL_SET_TIMEOUT
);
1893 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
1898 status
= set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_SUSPEND
);
1900 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
1902 /* paranoia: "should not happen" */
1903 (void) usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
1904 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
1905 USB_DEVICE_REMOTE_WAKEUP
, 0,
1907 USB_CTRL_SET_TIMEOUT
);
1909 /* device has up to 10 msec to fully suspend */
1910 dev_dbg(&udev
->dev
, "usb %ssuspend\n",
1911 udev
->auto_pm
? "auto-" : "");
1912 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
1919 * If the USB "suspend" state is in use (rather than "global suspend"),
1920 * many devices will be individually taken out of suspend state using
1921 * special "resume" signaling. This routine kicks in shortly after
1922 * hardware resume signaling is finished, either because of selective
1923 * resume (by host) or remote wakeup (by device) ... now see what changed
1924 * in the tree that's rooted at this device.
1926 * If @udev->reset_resume is set then the device is reset before the
1927 * status check is done.
1929 static int finish_port_resume(struct usb_device
*udev
)
1934 /* caller owns the udev device lock */
1935 dev_dbg(&udev
->dev
, "finish %sresume\n",
1936 udev
->reset_resume
? "reset-" : "");
1938 /* usb ch9 identifies four variants of SUSPENDED, based on what
1939 * state the device resumes to. Linux currently won't see the
1940 * first two on the host side; they'd be inside hub_port_init()
1941 * during many timeouts, but khubd can't suspend until later.
1943 usb_set_device_state(udev
, udev
->actconfig
1944 ? USB_STATE_CONFIGURED
1945 : USB_STATE_ADDRESS
);
1947 /* 10.5.4.5 says not to reset a suspended port if the attached
1948 * device is enabled for remote wakeup. Hence the reset
1949 * operation is carried out here, after the port has been
1952 if (udev
->reset_resume
)
1953 status
= usb_reset_device(udev
);
1955 /* 10.5.4.5 says be sure devices in the tree are still there.
1956 * For now let's assume the device didn't go crazy on resume,
1957 * and device drivers will know about any resume quirks.
1961 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
1963 status
= (status
> 0 ? 0 : -ENODEV
);
1967 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
1969 } else if (udev
->actconfig
) {
1970 le16_to_cpus(&devstatus
);
1971 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
)) {
1972 status
= usb_control_msg(udev
,
1973 usb_sndctrlpipe(udev
, 0),
1974 USB_REQ_CLEAR_FEATURE
,
1976 USB_DEVICE_REMOTE_WAKEUP
, 0,
1978 USB_CTRL_SET_TIMEOUT
);
1980 dev_dbg(&udev
->dev
, "disable remote "
1981 "wakeup, status %d\n", status
);
1989 * usb_port_resume - re-activate a suspended usb device's upstream port
1990 * @udev: device to re-activate, not a root hub
1991 * Context: must be able to sleep; device not locked; pm locks held
1993 * This will re-activate the suspended device, increasing power usage
1994 * while letting drivers communicate again with its endpoints.
1995 * USB resume explicitly guarantees that the power session between
1996 * the host and the device is the same as it was when the device
1999 * If @udev->reset_resume is set then this routine won't check that the
2000 * port is still enabled. Furthermore, finish_port_resume() above will
2001 * reset @udev. The end result is that a broken power session can be
2002 * recovered and @udev will appear to persist across a loss of VBUS power.
2004 * For example, if a host controller doesn't maintain VBUS suspend current
2005 * during a system sleep or is reset when the system wakes up, all the USB
2006 * power sessions below it will be broken. This is especially troublesome
2007 * for mass-storage devices containing mounted filesystems, since the
2008 * device will appear to have disconnected and all the memory mappings
2009 * to it will be lost. Using the USB_PERSIST facility, the device can be
2010 * made to appear as if it had not disconnected.
2012 * This facility can be dangerous. Although usb_reset_device() makes
2013 * every effort to insure that the same device is present after the
2014 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
2015 * quite possible for a device to remain unaltered but its media to be
2016 * changed. If the user replaces a flash memory card while the system is
2017 * asleep, he will have only himself to blame when the filesystem on the
2018 * new card is corrupted and the system crashes.
2020 * Returns 0 on success, else negative errno.
2022 int usb_port_resume(struct usb_device
*udev
)
2024 struct usb_hub
*hub
= hdev_to_hub(udev
->parent
);
2025 int port1
= udev
->portnum
;
2027 u16 portchange
, portstatus
;
2028 unsigned mask_flags
, want_flags
;
2030 /* Skip the initial Clear-Suspend step for a remote wakeup */
2031 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2032 if (status
== 0 && !(portstatus
& USB_PORT_STAT_SUSPEND
))
2033 goto SuspendCleared
;
2035 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
2037 set_bit(port1
, hub
->busy_bits
);
2039 /* see 7.1.7.7; affects power usage, but not budgeting */
2040 status
= clear_port_feature(hub
->hdev
,
2041 port1
, USB_PORT_FEAT_SUSPEND
);
2043 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
2046 /* drive resume for at least 20 msec */
2047 dev_dbg(&udev
->dev
, "usb %sresume\n",
2048 udev
->auto_pm
? "auto-" : "");
2051 /* Virtual root hubs can trigger on GET_PORT_STATUS to
2052 * stop resume signaling. Then finish the resume
2055 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2058 if (udev
->reset_resume
)
2059 want_flags
= USB_PORT_STAT_POWER
2060 | USB_PORT_STAT_CONNECTION
;
2062 want_flags
= USB_PORT_STAT_POWER
2063 | USB_PORT_STAT_CONNECTION
2064 | USB_PORT_STAT_ENABLE
;
2065 mask_flags
= want_flags
| USB_PORT_STAT_SUSPEND
;
2067 if (status
< 0 || (portstatus
& mask_flags
) != want_flags
) {
2068 dev_dbg(hub
->intfdev
,
2069 "port %d status %04x.%04x after resume, %d\n",
2070 port1
, portchange
, portstatus
, status
);
2074 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
2075 clear_port_feature(hub
->hdev
, port1
,
2076 USB_PORT_FEAT_C_SUSPEND
);
2077 /* TRSMRCY = 10 msec */
2082 clear_bit(port1
, hub
->busy_bits
);
2083 if (!hub
->hdev
->parent
&& !hub
->busy_bits
[0])
2084 usb_enable_root_hub_irq(hub
->hdev
->bus
);
2087 status
= finish_port_resume(udev
);
2089 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
2090 hub_port_logical_disconnect(hub
, port1
);
2095 static int remote_wakeup(struct usb_device
*udev
)
2099 usb_lock_device(udev
);
2100 if (udev
->state
== USB_STATE_SUSPENDED
) {
2101 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
2102 usb_mark_last_busy(udev
);
2103 status
= usb_external_resume_device(udev
);
2105 usb_unlock_device(udev
);
2109 #else /* CONFIG_USB_SUSPEND */
2111 /* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
2113 int usb_port_suspend(struct usb_device
*udev
)
2118 int usb_port_resume(struct usb_device
*udev
)
2122 /* However we may need to do a reset-resume */
2123 if (udev
->reset_resume
) {
2124 dev_dbg(&udev
->dev
, "reset-resume\n");
2125 status
= usb_reset_device(udev
);
2130 static inline int remote_wakeup(struct usb_device
*udev
)
2137 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
2139 struct usb_hub
*hub
= usb_get_intfdata (intf
);
2140 struct usb_device
*hdev
= hub
->hdev
;
2143 /* fail if children aren't already suspended */
2144 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
2145 struct usb_device
*udev
;
2147 udev
= hdev
->children
[port1
-1];
2148 if (udev
&& udev
->can_submit
) {
2150 dev_dbg(&intf
->dev
, "port %d nyet suspended\n",
2156 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2158 /* stop khubd and related activity */
2163 static int hub_resume(struct usb_interface
*intf
)
2165 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2167 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2168 hub_restart(hub
, HUB_RESUME
);
2172 static int hub_reset_resume(struct usb_interface
*intf
)
2174 struct usb_hub
*hub
= usb_get_intfdata(intf
);
2176 dev_dbg(&intf
->dev
, "%s\n", __func__
);
2178 hub_restart(hub
, HUB_RESET_RESUME
);
2183 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
2184 * @rhdev: struct usb_device for the root hub
2186 * The USB host controller driver calls this function when its root hub
2187 * is resumed and Vbus power has been interrupted or the controller
2188 * has been reset. The routine marks @rhdev as having lost power.
2189 * When the hub driver is resumed it will take notice and carry out
2190 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
2191 * the others will be disconnected.
2193 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
2195 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
2196 rhdev
->reset_resume
= 1;
2198 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
2200 #else /* CONFIG_PM */
2202 static inline int remote_wakeup(struct usb_device
*udev
)
2207 #define hub_suspend NULL
2208 #define hub_resume NULL
2209 #define hub_reset_resume NULL
2213 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
2215 * Between connect detection and reset signaling there must be a delay
2216 * of 100ms at least for debounce and power-settling. The corresponding
2217 * timer shall restart whenever the downstream port detects a disconnect.
2219 * Apparently there are some bluetooth and irda-dongles and a number of
2220 * low-speed devices for which this debounce period may last over a second.
2221 * Not covered by the spec - but easy to deal with.
2223 * This implementation uses a 1500ms total debounce timeout; if the
2224 * connection isn't stable by then it returns -ETIMEDOUT. It checks
2225 * every 25ms for transient disconnects. When the port status has been
2226 * unchanged for 100ms it returns the port status.
2229 #define HUB_DEBOUNCE_TIMEOUT 1500
2230 #define HUB_DEBOUNCE_STEP 25
2231 #define HUB_DEBOUNCE_STABLE 100
2233 static int hub_port_debounce(struct usb_hub
*hub
, int port1
)
2236 int total_time
, stable_time
= 0;
2237 u16 portchange
, portstatus
;
2238 unsigned connection
= 0xffff;
2240 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
2241 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2245 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
2246 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
2247 stable_time
+= HUB_DEBOUNCE_STEP
;
2248 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
2252 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
2255 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2256 clear_port_feature(hub
->hdev
, port1
,
2257 USB_PORT_FEAT_C_CONNECTION
);
2260 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
2262 msleep(HUB_DEBOUNCE_STEP
);
2265 dev_dbg (hub
->intfdev
,
2266 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2267 port1
, total_time
, stable_time
, portstatus
);
2269 if (stable_time
< HUB_DEBOUNCE_STABLE
)
2274 void usb_ep0_reinit(struct usb_device
*udev
)
2276 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
);
2277 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
);
2278 usb_enable_endpoint(udev
, &udev
->ep0
);
2280 EXPORT_SYMBOL_GPL(usb_ep0_reinit
);
2282 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2283 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2285 static int hub_set_address(struct usb_device
*udev
, int devnum
)
2291 if (udev
->state
== USB_STATE_ADDRESS
)
2293 if (udev
->state
!= USB_STATE_DEFAULT
)
2295 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
2296 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
2297 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2299 /* Device now using proper address. */
2300 update_address(udev
, devnum
);
2301 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
2302 usb_ep0_reinit(udev
);
2307 /* Reset device, (re)assign address, get device descriptor.
2308 * Device connection must be stable, no more debouncing needed.
2309 * Returns device in USB_STATE_ADDRESS, except on error.
2311 * If this is called for an already-existing device (as part of
2312 * usb_reset_device), the caller must own the device lock. For a
2313 * newly detected device that is not accessible through any global
2314 * pointers, it's not necessary to lock the device.
2317 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
2320 static DEFINE_MUTEX(usb_address0_mutex
);
2322 struct usb_device
*hdev
= hub
->hdev
;
2324 unsigned delay
= HUB_SHORT_RESET_TIME
;
2325 enum usb_device_speed oldspeed
= udev
->speed
;
2327 int devnum
= udev
->devnum
;
2329 /* root hub ports have a slightly longer reset period
2330 * (from USB 2.0 spec, section 7.1.7.5)
2332 if (!hdev
->parent
) {
2333 delay
= HUB_ROOT_RESET_TIME
;
2334 if (port1
== hdev
->bus
->otg_port
)
2335 hdev
->bus
->b_hnp_enable
= 0;
2338 /* Some low speed devices have problems with the quick delay, so */
2339 /* be a bit pessimistic with those devices. RHbug #23670 */
2340 if (oldspeed
== USB_SPEED_LOW
)
2341 delay
= HUB_LONG_RESET_TIME
;
2343 mutex_lock(&usb_address0_mutex
);
2345 /* Reset the device; full speed may morph to high speed */
2346 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2347 if (retval
< 0) /* error or disconnect */
2349 /* success, speed is known */
2352 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
2353 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
2356 oldspeed
= udev
->speed
;
2358 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2359 * it's fixed size except for full speed devices.
2360 * For Wireless USB devices, ep0 max packet is always 512 (tho
2361 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
2363 switch (udev
->speed
) {
2364 case USB_SPEED_VARIABLE
: /* fixed at 512 */
2365 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(512);
2367 case USB_SPEED_HIGH
: /* fixed at 64 */
2368 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2370 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
2371 /* to determine the ep0 maxpacket size, try to read
2372 * the device descriptor to get bMaxPacketSize0 and
2373 * then correct our initial guess.
2375 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(64);
2377 case USB_SPEED_LOW
: /* fixed at 8 */
2378 udev
->ep0
.desc
.wMaxPacketSize
= __constant_cpu_to_le16(8);
2385 switch (udev
->speed
) {
2386 case USB_SPEED_LOW
: speed
= "low"; break;
2387 case USB_SPEED_FULL
: speed
= "full"; break;
2388 case USB_SPEED_HIGH
: speed
= "high"; break;
2389 case USB_SPEED_VARIABLE
:
2393 default: speed
= "?"; break;
2395 dev_info (&udev
->dev
,
2396 "%s %s speed %sUSB device using %s and address %d\n",
2397 (udev
->config
) ? "reset" : "new", speed
, type
,
2398 udev
->bus
->controller
->driver
->name
, devnum
);
2400 /* Set up TT records, if needed */
2402 udev
->tt
= hdev
->tt
;
2403 udev
->ttport
= hdev
->ttport
;
2404 } else if (udev
->speed
!= USB_SPEED_HIGH
2405 && hdev
->speed
== USB_SPEED_HIGH
) {
2406 udev
->tt
= &hub
->tt
;
2407 udev
->ttport
= port1
;
2410 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2411 * Because device hardware and firmware is sometimes buggy in
2412 * this area, and this is how Linux has done it for ages.
2413 * Change it cautiously.
2415 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2416 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2417 * so it may help with some non-standards-compliant devices.
2418 * Otherwise we start with SET_ADDRESS and then try to read the
2419 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2422 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
2423 if (USE_NEW_SCHEME(retry_counter
)) {
2424 struct usb_device_descriptor
*buf
;
2427 #define GET_DESCRIPTOR_BUFSIZE 64
2428 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
2434 /* Retry on all errors; some devices are flakey.
2435 * 255 is for WUSB devices, we actually need to use
2436 * 512 (WUSB1.0[4.8.1]).
2438 for (j
= 0; j
< 3; ++j
) {
2439 buf
->bMaxPacketSize0
= 0;
2440 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
2441 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
2442 USB_DT_DEVICE
<< 8, 0,
2443 buf
, GET_DESCRIPTOR_BUFSIZE
,
2444 USB_CTRL_GET_TIMEOUT
);
2445 switch (buf
->bMaxPacketSize0
) {
2446 case 8: case 16: case 32: case 64: case 255:
2447 if (buf
->bDescriptorType
==
2461 udev
->descriptor
.bMaxPacketSize0
=
2462 buf
->bMaxPacketSize0
;
2465 retval
= hub_port_reset(hub
, port1
, udev
, delay
);
2466 if (retval
< 0) /* error or disconnect */
2468 if (oldspeed
!= udev
->speed
) {
2470 "device reset changed speed!\n");
2475 dev_err(&udev
->dev
, "device descriptor "
2476 "read/%s, error %d\n",
2481 #undef GET_DESCRIPTOR_BUFSIZE
2485 * If device is WUSB, we already assigned an
2486 * unauthorized address in the Connect Ack sequence;
2487 * authorization will assign the final address.
2489 if (udev
->wusb
== 0) {
2490 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
2491 retval
= hub_set_address(udev
, devnum
);
2498 "device not accepting address %d, error %d\n",
2503 /* cope with hardware quirkiness:
2504 * - let SET_ADDRESS settle, some device hardware wants it
2505 * - read ep0 maxpacket even for high and low speed,
2508 if (USE_NEW_SCHEME(retry_counter
))
2512 retval
= usb_get_device_descriptor(udev
, 8);
2514 dev_err(&udev
->dev
, "device descriptor "
2515 "read/%s, error %d\n",
2527 i
= udev
->descriptor
.bMaxPacketSize0
== 0xff? /* wusb device? */
2528 512 : udev
->descriptor
.bMaxPacketSize0
;
2529 if (le16_to_cpu(udev
->ep0
.desc
.wMaxPacketSize
) != i
) {
2530 if (udev
->speed
!= USB_SPEED_FULL
||
2531 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
2532 dev_err(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2536 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
2537 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
2538 usb_ep0_reinit(udev
);
2541 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
2542 if (retval
< (signed)sizeof(udev
->descriptor
)) {
2543 dev_err(&udev
->dev
, "device descriptor read/%s, error %d\n",
2554 hub_port_disable(hub
, port1
, 0);
2555 update_address(udev
, devnum
); /* for disconnect processing */
2557 mutex_unlock(&usb_address0_mutex
);
2562 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
2564 struct usb_qualifier_descriptor
*qual
;
2567 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
2571 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
2572 qual
, sizeof *qual
);
2573 if (status
== sizeof *qual
) {
2574 dev_info(&udev
->dev
, "not running at top speed; "
2575 "connect to a high speed hub\n");
2576 /* hub LEDs are probably harder to miss than syslog */
2577 if (hub
->has_indicators
) {
2578 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
2579 schedule_delayed_work (&hub
->leds
, 0);
2586 hub_power_remaining (struct usb_hub
*hub
)
2588 struct usb_device
*hdev
= hub
->hdev
;
2592 if (!hub
->limited_power
)
2595 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
2596 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
2597 struct usb_device
*udev
= hdev
->children
[port1
- 1];
2603 /* Unconfigured devices may not use more than 100mA,
2604 * or 8mA for OTG ports */
2605 if (udev
->actconfig
)
2606 delta
= udev
->actconfig
->desc
.bMaxPower
* 2;
2607 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
2611 if (delta
> hub
->mA_per_port
)
2612 dev_warn(&udev
->dev
, "%dmA is over %umA budget "
2614 delta
, hub
->mA_per_port
, port1
);
2617 if (remaining
< 0) {
2618 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
2625 /* Handle physical or logical connection change events.
2626 * This routine is called when:
2627 * a port connection-change occurs;
2628 * a port enable-change occurs (often caused by EMI);
2629 * usb_reset_device() encounters changed descriptors (as from
2630 * a firmware download)
2631 * caller already locked the hub
2633 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
2634 u16 portstatus
, u16 portchange
)
2636 struct usb_device
*hdev
= hub
->hdev
;
2637 struct device
*hub_dev
= hub
->intfdev
;
2638 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
2639 u16 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2643 "port %d, status %04x, change %04x, %s\n",
2644 port1
, portstatus
, portchange
, portspeed (portstatus
));
2646 if (hub
->has_indicators
) {
2647 set_port_led(hub
, port1
, HUB_LED_AUTO
);
2648 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
2651 /* Disconnect any existing devices under this port */
2652 if (hdev
->children
[port1
-1])
2653 usb_disconnect(&hdev
->children
[port1
-1]);
2654 clear_bit(port1
, hub
->change_bits
);
2656 #ifdef CONFIG_USB_OTG
2657 /* during HNP, don't repeat the debounce */
2658 if (hdev
->bus
->is_b_host
)
2659 portchange
&= ~USB_PORT_STAT_C_CONNECTION
;
2662 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2663 status
= hub_port_debounce(hub
, port1
);
2665 if (printk_ratelimit())
2666 dev_err (hub_dev
, "connect-debounce failed, "
2667 "port %d disabled\n", port1
);
2670 portstatus
= status
;
2673 /* Return now if nothing is connected */
2674 if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2676 /* maybe switch power back on (e.g. root hub was reset) */
2677 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
2678 && !(portstatus
& (1 << USB_PORT_FEAT_POWER
)))
2679 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
2681 if (portstatus
& USB_PORT_STAT_ENABLE
)
2686 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
2687 struct usb_device
*udev
;
2689 /* reallocate for each attempt, since references
2690 * to the previous one can escape in various ways
2692 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
2695 "couldn't allocate port %d usb_device\n",
2700 usb_set_device_state(udev
, USB_STATE_POWERED
);
2701 udev
->speed
= USB_SPEED_UNKNOWN
;
2702 udev
->bus_mA
= hub
->mA_per_port
;
2703 udev
->level
= hdev
->level
+ 1;
2704 udev
->wusb
= hub_is_wusb(hub
);
2706 /* set the address */
2707 choose_address(udev
);
2708 if (udev
->devnum
<= 0) {
2709 status
= -ENOTCONN
; /* Don't retry */
2713 /* reset and get descriptor */
2714 status
= hub_port_init(hub
, udev
, port1
, i
);
2718 /* consecutive bus-powered hubs aren't reliable; they can
2719 * violate the voltage drop budget. if the new child has
2720 * a "powered" LED, users should notice we didn't enable it
2721 * (without reading syslog), even without per-port LEDs
2724 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
2725 && udev
->bus_mA
<= 100) {
2728 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
2731 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
2734 le16_to_cpus(&devstat
);
2735 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
2737 "can't connect bus-powered hub "
2739 if (hub
->has_indicators
) {
2740 hub
->indicator
[port1
-1] =
2741 INDICATOR_AMBER_BLINK
;
2742 schedule_delayed_work (&hub
->leds
, 0);
2744 status
= -ENOTCONN
; /* Don't retry */
2749 /* check for devices running slower than they could */
2750 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
2751 && udev
->speed
== USB_SPEED_FULL
2752 && highspeed_hubs
!= 0)
2753 check_highspeed (hub
, udev
, port1
);
2755 /* Store the parent's children[] pointer. At this point
2756 * udev becomes globally accessible, although presumably
2757 * no one will look at it until hdev is unlocked.
2761 /* We mustn't add new devices if the parent hub has
2762 * been disconnected; we would race with the
2763 * recursively_mark_NOTATTACHED() routine.
2765 spin_lock_irq(&device_state_lock
);
2766 if (hdev
->state
== USB_STATE_NOTATTACHED
)
2769 hdev
->children
[port1
-1] = udev
;
2770 spin_unlock_irq(&device_state_lock
);
2772 /* Run it through the hoops (find a driver, etc) */
2774 status
= usb_new_device(udev
);
2776 spin_lock_irq(&device_state_lock
);
2777 hdev
->children
[port1
-1] = NULL
;
2778 spin_unlock_irq(&device_state_lock
);
2785 status
= hub_power_remaining(hub
);
2787 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
2792 hub_port_disable(hub
, port1
, 1);
2794 usb_ep0_reinit(udev
);
2795 release_address(udev
);
2797 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
2800 if (hub
->hdev
->parent
||
2801 !hcd
->driver
->port_handed_over
||
2802 !(hcd
->driver
->port_handed_over
)(hcd
, port1
))
2803 dev_err(hub_dev
, "unable to enumerate USB device on port %d\n",
2807 hub_port_disable(hub
, port1
, 1);
2808 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
2809 hcd
->driver
->relinquish_port(hcd
, port1
);
2812 static void hub_events(void)
2814 struct list_head
*tmp
;
2815 struct usb_device
*hdev
;
2816 struct usb_interface
*intf
;
2817 struct usb_hub
*hub
;
2818 struct device
*hub_dev
;
2827 * We restart the list every time to avoid a deadlock with
2828 * deleting hubs downstream from this one. This should be
2829 * safe since we delete the hub from the event list.
2830 * Not the most efficient, but avoids deadlocks.
2834 /* Grab the first entry at the beginning of the list */
2835 spin_lock_irq(&hub_event_lock
);
2836 if (list_empty(&hub_event_list
)) {
2837 spin_unlock_irq(&hub_event_lock
);
2841 tmp
= hub_event_list
.next
;
2844 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
2845 kref_get(&hub
->kref
);
2846 spin_unlock_irq(&hub_event_lock
);
2849 hub_dev
= hub
->intfdev
;
2850 intf
= to_usb_interface(hub_dev
);
2851 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
2852 hdev
->state
, hub
->descriptor
2853 ? hub
->descriptor
->bNbrPorts
2855 /* NOTE: expects max 15 ports... */
2856 (u16
) hub
->change_bits
[0],
2857 (u16
) hub
->event_bits
[0]);
2859 /* Lock the device, then check to see if we were
2860 * disconnected while waiting for the lock to succeed. */
2861 usb_lock_device(hdev
);
2862 if (unlikely(hub
->disconnected
))
2865 /* If the hub has died, clean up after it */
2866 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
2867 hub
->error
= -ENODEV
;
2873 ret
= usb_autopm_get_interface(intf
);
2875 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
2879 /* If this is an inactive hub, do nothing */
2884 dev_dbg (hub_dev
, "resetting for error %d\n",
2887 ret
= usb_reset_composite_device(hdev
, intf
);
2890 "error resetting hub: %d\n", ret
);
2898 /* deal with port status changes */
2899 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
2900 if (test_bit(i
, hub
->busy_bits
))
2902 connect_change
= test_bit(i
, hub
->change_bits
);
2903 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
2904 !connect_change
&& !hub
->activating
)
2907 ret
= hub_port_status(hub
, i
,
2908 &portstatus
, &portchange
);
2912 if (hub
->activating
&& !hdev
->children
[i
-1] &&
2914 USB_PORT_STAT_CONNECTION
))
2917 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
2918 clear_port_feature(hdev
, i
,
2919 USB_PORT_FEAT_C_CONNECTION
);
2923 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
2924 if (!connect_change
)
2926 "port %d enable change, "
2929 clear_port_feature(hdev
, i
,
2930 USB_PORT_FEAT_C_ENABLE
);
2933 * EM interference sometimes causes badly
2934 * shielded USB devices to be shutdown by
2935 * the hub, this hack enables them again.
2936 * Works at least with mouse driver.
2938 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
2940 && hdev
->children
[i
-1]) {
2943 "disabled by hub (EMI?), "
2950 if (portchange
& USB_PORT_STAT_C_SUSPEND
) {
2951 clear_port_feature(hdev
, i
,
2952 USB_PORT_FEAT_C_SUSPEND
);
2953 if (hdev
->children
[i
-1]) {
2954 ret
= remote_wakeup(hdev
->
2960 hub_port_disable(hub
, i
, 1);
2963 "resume on port %d, status %d\n",
2967 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
2969 "over-current change on port %d\n",
2971 clear_port_feature(hdev
, i
,
2972 USB_PORT_FEAT_C_OVER_CURRENT
);
2976 if (portchange
& USB_PORT_STAT_C_RESET
) {
2978 "reset change on port %d\n",
2980 clear_port_feature(hdev
, i
,
2981 USB_PORT_FEAT_C_RESET
);
2985 hub_port_connect_change(hub
, i
,
2986 portstatus
, portchange
);
2989 /* deal with hub status changes */
2990 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
2992 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
2993 dev_err (hub_dev
, "get_hub_status failed\n");
2995 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
2996 dev_dbg (hub_dev
, "power change\n");
2997 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
2998 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
2999 /* FIXME: Is this always true? */
3000 hub
->limited_power
= 1;
3002 hub
->limited_power
= 0;
3004 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
3005 dev_dbg (hub_dev
, "overcurrent change\n");
3006 msleep(500); /* Cool down */
3007 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
3012 hub
->activating
= 0;
3014 /* If this is a root hub, tell the HCD it's okay to
3015 * re-enable port-change interrupts now. */
3016 if (!hdev
->parent
&& !hub
->busy_bits
[0])
3017 usb_enable_root_hub_irq(hdev
->bus
);
3020 /* Allow autosuspend if we're not going to run again */
3021 if (list_empty(&hub
->event_list
))
3022 usb_autopm_enable(intf
);
3024 usb_unlock_device(hdev
);
3025 kref_put(&hub
->kref
, hub_release
);
3027 } /* end while (1) */
3030 static int hub_thread(void *__unused
)
3032 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
3033 * port handover. Otherwise it might see that a full-speed device
3034 * was gone before the EHCI controller had handed its port over to
3035 * the companion full-speed controller.
3041 wait_event_freezable(khubd_wait
,
3042 !list_empty(&hub_event_list
) ||
3043 kthread_should_stop());
3044 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
3046 pr_debug("%s: khubd exiting\n", usbcore_name
);
3050 static struct usb_device_id hub_id_table
[] = {
3051 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
3052 .bDeviceClass
= USB_CLASS_HUB
},
3053 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
3054 .bInterfaceClass
= USB_CLASS_HUB
},
3055 { } /* Terminating entry */
3058 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
3060 static struct usb_driver hub_driver
= {
3063 .disconnect
= hub_disconnect
,
3064 .suspend
= hub_suspend
,
3065 .resume
= hub_resume
,
3066 .reset_resume
= hub_reset_resume
,
3067 .pre_reset
= hub_pre_reset
,
3068 .post_reset
= hub_post_reset
,
3070 .id_table
= hub_id_table
,
3071 .supports_autosuspend
= 1,
3074 int usb_hub_init(void)
3076 if (usb_register(&hub_driver
) < 0) {
3077 printk(KERN_ERR
"%s: can't register hub driver\n",
3082 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
3083 if (!IS_ERR(khubd_task
))
3086 /* Fall through if kernel_thread failed */
3087 usb_deregister(&hub_driver
);
3088 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
3093 void usb_hub_cleanup(void)
3095 kthread_stop(khubd_task
);
3098 * Hub resources are freed for us by usb_deregister. It calls
3099 * usb_driver_purge on every device which in turn calls that
3100 * devices disconnect function if it is using this driver.
3101 * The hub_disconnect function takes care of releasing the
3102 * individual hub resources. -greg
3104 usb_deregister(&hub_driver
);
3105 } /* usb_hub_cleanup() */
3107 static int descriptors_changed(struct usb_device
*udev
,
3108 struct usb_device_descriptor
*old_device_descriptor
)
3112 unsigned serial_len
= 0;
3114 unsigned old_length
;
3118 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
3119 sizeof(*old_device_descriptor
)) != 0)
3122 /* Since the idVendor, idProduct, and bcdDevice values in the
3123 * device descriptor haven't changed, we will assume the
3124 * Manufacturer and Product strings haven't changed either.
3125 * But the SerialNumber string could be different (e.g., a
3126 * different flash card of the same brand).
3129 serial_len
= strlen(udev
->serial
) + 1;
3132 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3133 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3134 len
= max(len
, old_length
);
3137 buf
= kmalloc(len
, GFP_NOIO
);
3139 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
3140 /* assume the worst */
3143 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
3144 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
3145 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
3147 if (length
!= old_length
) {
3148 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
3153 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
3155 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
3157 ((struct usb_config_descriptor
*) buf
)->
3158 bConfigurationValue
);
3164 if (!changed
&& serial_len
) {
3165 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
3167 if (length
+ 1 != serial_len
) {
3168 dev_dbg(&udev
->dev
, "serial string error %d\n",
3171 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
3172 dev_dbg(&udev
->dev
, "serial string changed\n");
3182 * usb_reset_device - perform a USB port reset to reinitialize a device
3183 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3185 * WARNING - don't use this routine to reset a composite device
3186 * (one with multiple interfaces owned by separate drivers)!
3187 * Use usb_reset_composite_device() instead.
3189 * Do a port reset, reassign the device's address, and establish its
3190 * former operating configuration. If the reset fails, or the device's
3191 * descriptors change from their values before the reset, or the original
3192 * configuration and altsettings cannot be restored, a flag will be set
3193 * telling khubd to pretend the device has been disconnected and then
3194 * re-connected. All drivers will be unbound, and the device will be
3195 * re-enumerated and probed all over again.
3197 * Returns 0 if the reset succeeded, -ENODEV if the device has been
3198 * flagged for logical disconnection, or some other negative error code
3199 * if the reset wasn't even attempted.
3201 * The caller must own the device lock. For example, it's safe to use
3202 * this from a driver probe() routine after downloading new firmware.
3203 * For calls that might not occur during probe(), drivers should lock
3204 * the device using usb_lock_device_for_reset().
3206 * Locking exception: This routine may also be called from within an
3207 * autoresume handler. Such usage won't conflict with other tasks
3208 * holding the device lock because these tasks should always call
3209 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
3211 int usb_reset_device(struct usb_device
*udev
)
3213 struct usb_device
*parent_hdev
= udev
->parent
;
3214 struct usb_hub
*parent_hub
;
3215 struct usb_device_descriptor descriptor
= udev
->descriptor
;
3217 int port1
= udev
->portnum
;
3219 if (udev
->state
== USB_STATE_NOTATTACHED
||
3220 udev
->state
== USB_STATE_SUSPENDED
) {
3221 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3227 /* this requires hcd-specific logic; see OHCI hc_restart() */
3228 dev_dbg(&udev
->dev
, "%s for root hub!\n", __func__
);
3231 parent_hub
= hdev_to_hub(parent_hdev
);
3233 set_bit(port1
, parent_hub
->busy_bits
);
3234 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
3236 /* ep0 maxpacket size may change; let the HCD know about it.
3237 * Other endpoints will be handled by re-enumeration. */
3238 usb_ep0_reinit(udev
);
3239 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
3240 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
3243 clear_bit(port1
, parent_hub
->busy_bits
);
3244 if (!parent_hdev
->parent
&& !parent_hub
->busy_bits
[0])
3245 usb_enable_root_hub_irq(parent_hdev
->bus
);
3250 /* Device might have changed firmware (DFU or similar) */
3251 if (descriptors_changed(udev
, &descriptor
)) {
3252 dev_info(&udev
->dev
, "device firmware changed\n");
3253 udev
->descriptor
= descriptor
; /* for disconnect() calls */
3257 if (!udev
->actconfig
)
3260 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3261 USB_REQ_SET_CONFIGURATION
, 0,
3262 udev
->actconfig
->desc
.bConfigurationValue
, 0,
3263 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3266 "can't restore configuration #%d (error=%d)\n",
3267 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
3270 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
3272 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
3273 struct usb_interface
*intf
= udev
->actconfig
->interface
[i
];
3274 struct usb_interface_descriptor
*desc
;
3276 /* set_interface resets host side toggle even
3277 * for altsetting zero. the interface may have no driver.
3279 desc
= &intf
->cur_altsetting
->desc
;
3280 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
3281 desc
->bAlternateSetting
);
3283 dev_err(&udev
->dev
, "failed to restore interface %d "
3284 "altsetting %d (error=%d)\n",
3285 desc
->bInterfaceNumber
,
3286 desc
->bAlternateSetting
,
3296 hub_port_logical_disconnect(parent_hub
, port1
);
3299 EXPORT_SYMBOL_GPL(usb_reset_device
);
3302 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3303 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3304 * @iface: interface bound to the driver making the request (optional)
3306 * Warns all drivers bound to registered interfaces (using their pre_reset
3307 * method), performs the port reset, and then lets the drivers know that
3308 * the reset is over (using their post_reset method).
3310 * Return value is the same as for usb_reset_device().
3312 * The caller must own the device lock. For example, it's safe to use
3313 * this from a driver probe() routine after downloading new firmware.
3314 * For calls that might not occur during probe(), drivers should lock
3315 * the device using usb_lock_device_for_reset().
3317 int usb_reset_composite_device(struct usb_device
*udev
,
3318 struct usb_interface
*iface
)
3322 struct usb_host_config
*config
= udev
->actconfig
;
3324 if (udev
->state
== USB_STATE_NOTATTACHED
||
3325 udev
->state
== USB_STATE_SUSPENDED
) {
3326 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
3331 /* Prevent autosuspend during the reset */
3332 usb_autoresume_device(udev
);
3334 if (iface
&& iface
->condition
!= USB_INTERFACE_BINDING
)
3338 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
3339 struct usb_interface
*cintf
= config
->interface
[i
];
3340 struct usb_driver
*drv
;
3342 if (cintf
->dev
.driver
) {
3343 drv
= to_usb_driver(cintf
->dev
.driver
);
3345 (drv
->pre_reset
)(cintf
);
3346 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
3351 ret
= usb_reset_device(udev
);
3354 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
3355 struct usb_interface
*cintf
= config
->interface
[i
];
3356 struct usb_driver
*drv
;
3358 if (cintf
->dev
.driver
) {
3359 drv
= to_usb_driver(cintf
->dev
.driver
);
3360 if (drv
->post_reset
)
3361 (drv
->post_reset
)(cintf
);
3362 /* FIXME: Unbind if post_reset returns an error or isn't defined */
3367 usb_autosuspend_device(udev
);
3370 EXPORT_SYMBOL_GPL(usb_reset_composite_device
);