4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/completion.h>
16 #include <linux/sched.h>
17 #include <linux/list.h>
18 #include <linux/slab.h>
19 #include <linux/ioctl.h>
20 #include <linux/usb.h>
21 #include <linux/usbdevice_fs.h>
22 #include <linux/usb/hcd.h>
23 #include <linux/usb/otg.h>
24 #include <linux/usb/quirks.h>
25 #include <linux/workqueue.h>
26 #include <linux/mutex.h>
27 #include <linux/random.h>
28 #include <linux/pm_qos.h>
30 #include <asm/uaccess.h>
31 #include <asm/byteorder.h>
34 #include "otg_whitelist.h"
35 #if defined(CONFIG_USB_OTG_WHITELIST_FOR_MDM)
36 #include "otg_whitelist_for_mdm.h"
39 #define USB_VENDOR_GENESYS_LOGIC 0x05e3
40 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01
42 /* Protect struct usb_device->state and ->children members
43 * Note: Both are also protected by ->dev.sem, except that ->state can
44 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
45 static DEFINE_SPINLOCK(device_state_lock
);
47 /* workqueue to process hub events */
48 static struct workqueue_struct
*hub_wq
;
49 static void hub_event(struct work_struct
*work
);
51 /* synchronize hub-port add/remove and peering operations */
52 DEFINE_MUTEX(usb_port_peer_mutex
);
54 /* cycle leds on hubs that aren't blinking for attention */
55 static bool blinkenlights
= 0;
56 module_param(blinkenlights
, bool, S_IRUGO
);
57 MODULE_PARM_DESC(blinkenlights
, "true to cycle leds on hubs");
60 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
61 * 10 seconds to send reply for the initial 64-byte descriptor request.
63 /* define initial 64-byte descriptor request timeout in milliseconds */
64 static int initial_descriptor_timeout
= USB_CTRL_GET_TIMEOUT
;
65 module_param(initial_descriptor_timeout
, int, S_IRUGO
|S_IWUSR
);
66 MODULE_PARM_DESC(initial_descriptor_timeout
,
67 "initial 64-byte descriptor request timeout in milliseconds "
68 "(default 5000 - 5.0 seconds)");
71 * As of 2.6.10 we introduce a new USB device initialization scheme which
72 * closely resembles the way Windows works. Hopefully it will be compatible
73 * with a wider range of devices than the old scheme. However some previously
74 * working devices may start giving rise to "device not accepting address"
75 * errors; if that happens the user can try the old scheme by adjusting the
76 * following module parameters.
78 * For maximum flexibility there are two boolean parameters to control the
79 * hub driver's behavior. On the first initialization attempt, if the
80 * "old_scheme_first" parameter is set then the old scheme will be used,
81 * otherwise the new scheme is used. If that fails and "use_both_schemes"
82 * is set, then the driver will make another attempt, using the other scheme.
84 static bool old_scheme_first
= 0;
85 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
86 MODULE_PARM_DESC(old_scheme_first
,
87 "start with the old device initialization scheme");
89 static bool use_both_schemes
= 1;
90 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
91 MODULE_PARM_DESC(use_both_schemes
,
92 "try the other device initialization scheme if the "
95 /* Mutual exclusion for EHCI CF initialization. This interferes with
96 * port reset on some companion controllers.
98 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
99 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
101 #define HUB_DEBOUNCE_TIMEOUT 2000
102 #define HUB_DEBOUNCE_STEP 25
103 #define HUB_DEBOUNCE_STABLE 100
105 static void hub_release(struct kref
*kref
);
106 static int usb_reset_and_verify_device(struct usb_device
*udev
);
107 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
);
109 static inline char *portspeed(struct usb_hub
*hub
, int portstatus
)
111 if (hub_is_superspeed(hub
->hdev
))
113 if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
115 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
121 /* Note that hdev or one of its children must be locked! */
122 struct usb_hub
*usb_hub_to_struct_hub(struct usb_device
*hdev
)
124 if (!hdev
|| !hdev
->actconfig
|| !hdev
->maxchild
)
126 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
129 int usb_device_supports_lpm(struct usb_device
*udev
)
131 /* Some devices have trouble with LPM */
132 if (udev
->quirks
& USB_QUIRK_NO_LPM
)
135 /* USB 2.1 (and greater) devices indicate LPM support through
136 * their USB 2.0 Extended Capabilities BOS descriptor.
138 if (udev
->speed
== USB_SPEED_HIGH
|| udev
->speed
== USB_SPEED_FULL
) {
139 if (udev
->bos
->ext_cap
&&
141 le32_to_cpu(udev
->bos
->ext_cap
->bmAttributes
)))
147 * According to the USB 3.0 spec, all USB 3.0 devices must support LPM.
148 * However, there are some that don't, and they set the U1/U2 exit
151 if (!udev
->bos
->ss_cap
) {
152 dev_info(&udev
->dev
, "No LPM exit latency info found, disabling LPM.\n");
156 if (udev
->bos
->ss_cap
->bU1devExitLat
== 0 &&
157 udev
->bos
->ss_cap
->bU2DevExitLat
== 0) {
159 dev_info(&udev
->dev
, "LPM exit latency is zeroed, disabling LPM.\n");
161 dev_info(&udev
->dev
, "We don't know the algorithms for LPM for this host, disabling LPM.\n");
165 if (!udev
->parent
|| udev
->parent
->lpm_capable
)
171 * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
174 static void usb_set_lpm_mel(struct usb_device
*udev
,
175 struct usb3_lpm_parameters
*udev_lpm_params
,
176 unsigned int udev_exit_latency
,
178 struct usb3_lpm_parameters
*hub_lpm_params
,
179 unsigned int hub_exit_latency
)
181 unsigned int total_mel
;
182 unsigned int device_mel
;
183 unsigned int hub_mel
;
186 * Calculate the time it takes to transition all links from the roothub
187 * to the parent hub into U0. The parent hub must then decode the
188 * packet (hub header decode latency) to figure out which port it was
191 * The Hub Header decode latency is expressed in 0.1us intervals (0x1
192 * means 0.1us). Multiply that by 100 to get nanoseconds.
194 total_mel
= hub_lpm_params
->mel
+
195 (hub
->descriptor
->u
.ss
.bHubHdrDecLat
* 100);
198 * How long will it take to transition the downstream hub's port into
199 * U0? The greater of either the hub exit latency or the device exit
202 * The BOS U1/U2 exit latencies are expressed in 1us intervals.
203 * Multiply that by 1000 to get nanoseconds.
205 device_mel
= udev_exit_latency
* 1000;
206 hub_mel
= hub_exit_latency
* 1000;
207 if (device_mel
> hub_mel
)
208 total_mel
+= device_mel
;
210 total_mel
+= hub_mel
;
212 udev_lpm_params
->mel
= total_mel
;
216 * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
217 * a transition from either U1 or U2.
219 static void usb_set_lpm_pel(struct usb_device
*udev
,
220 struct usb3_lpm_parameters
*udev_lpm_params
,
221 unsigned int udev_exit_latency
,
223 struct usb3_lpm_parameters
*hub_lpm_params
,
224 unsigned int hub_exit_latency
,
225 unsigned int port_to_port_exit_latency
)
227 unsigned int first_link_pel
;
228 unsigned int hub_pel
;
231 * First, the device sends an LFPS to transition the link between the
232 * device and the parent hub into U0. The exit latency is the bigger of
233 * the device exit latency or the hub exit latency.
235 if (udev_exit_latency
> hub_exit_latency
)
236 first_link_pel
= udev_exit_latency
* 1000;
238 first_link_pel
= hub_exit_latency
* 1000;
241 * When the hub starts to receive the LFPS, there is a slight delay for
242 * it to figure out that one of the ports is sending an LFPS. Then it
243 * will forward the LFPS to its upstream link. The exit latency is the
244 * delay, plus the PEL that we calculated for this hub.
246 hub_pel
= port_to_port_exit_latency
* 1000 + hub_lpm_params
->pel
;
249 * According to figure C-7 in the USB 3.0 spec, the PEL for this device
250 * is the greater of the two exit latencies.
252 if (first_link_pel
> hub_pel
)
253 udev_lpm_params
->pel
= first_link_pel
;
255 udev_lpm_params
->pel
= hub_pel
;
259 * Set the System Exit Latency (SEL) to indicate the total worst-case time from
260 * when a device initiates a transition to U0, until when it will receive the
261 * first packet from the host controller.
263 * Section C.1.5.1 describes the four components to this:
265 * - t2: time for the ERDY to make it from the device to the host.
266 * - t3: a host-specific delay to process the ERDY.
267 * - t4: time for the packet to make it from the host to the device.
269 * t3 is specific to both the xHCI host and the platform the host is integrated
270 * into. The Intel HW folks have said it's negligible, FIXME if a different
271 * vendor says otherwise.
273 static void usb_set_lpm_sel(struct usb_device
*udev
,
274 struct usb3_lpm_parameters
*udev_lpm_params
)
276 struct usb_device
*parent
;
277 unsigned int num_hubs
;
278 unsigned int total_sel
;
280 /* t1 = device PEL */
281 total_sel
= udev_lpm_params
->pel
;
282 /* How many external hubs are in between the device & the root port. */
283 for (parent
= udev
->parent
, num_hubs
= 0; parent
->parent
;
284 parent
= parent
->parent
)
286 /* t2 = 2.1us + 250ns * (num_hubs - 1) */
288 total_sel
+= 2100 + 250 * (num_hubs
- 1);
290 /* t4 = 250ns * num_hubs */
291 total_sel
+= 250 * num_hubs
;
293 udev_lpm_params
->sel
= total_sel
;
296 static void usb_set_lpm_parameters(struct usb_device
*udev
)
299 unsigned int port_to_port_delay
;
300 unsigned int udev_u1_del
;
301 unsigned int udev_u2_del
;
302 unsigned int hub_u1_del
;
303 unsigned int hub_u2_del
;
305 if (!udev
->lpm_capable
|| udev
->speed
< USB_SPEED_SUPER
)
308 hub
= usb_hub_to_struct_hub(udev
->parent
);
309 /* It doesn't take time to transition the roothub into U0, since it
310 * doesn't have an upstream link.
315 udev_u1_del
= udev
->bos
->ss_cap
->bU1devExitLat
;
316 udev_u2_del
= le16_to_cpu(udev
->bos
->ss_cap
->bU2DevExitLat
);
317 hub_u1_del
= udev
->parent
->bos
->ss_cap
->bU1devExitLat
;
318 hub_u2_del
= le16_to_cpu(udev
->parent
->bos
->ss_cap
->bU2DevExitLat
);
320 usb_set_lpm_mel(udev
, &udev
->u1_params
, udev_u1_del
,
321 hub
, &udev
->parent
->u1_params
, hub_u1_del
);
323 usb_set_lpm_mel(udev
, &udev
->u2_params
, udev_u2_del
,
324 hub
, &udev
->parent
->u2_params
, hub_u2_del
);
327 * Appendix C, section C.2.2.2, says that there is a slight delay from
328 * when the parent hub notices the downstream port is trying to
329 * transition to U0 to when the hub initiates a U0 transition on its
330 * upstream port. The section says the delays are tPort2PortU1EL and
331 * tPort2PortU2EL, but it doesn't define what they are.
333 * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
334 * about the same delays. Use the maximum delay calculations from those
335 * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
336 * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
337 * assume the device exit latencies they are talking about are the hub
340 * What do we do if the U2 exit latency is less than the U1 exit
341 * latency? It's possible, although not likely...
343 port_to_port_delay
= 1;
345 usb_set_lpm_pel(udev
, &udev
->u1_params
, udev_u1_del
,
346 hub
, &udev
->parent
->u1_params
, hub_u1_del
,
349 if (hub_u2_del
> hub_u1_del
)
350 port_to_port_delay
= 1 + hub_u2_del
- hub_u1_del
;
352 port_to_port_delay
= 1 + hub_u1_del
;
354 usb_set_lpm_pel(udev
, &udev
->u2_params
, udev_u2_del
,
355 hub
, &udev
->parent
->u2_params
, hub_u2_del
,
358 /* Now that we've got PEL, calculate SEL. */
359 usb_set_lpm_sel(udev
, &udev
->u1_params
);
360 usb_set_lpm_sel(udev
, &udev
->u2_params
);
363 /* USB 2.0 spec Section 11.24.4.5 */
364 static int get_hub_descriptor(struct usb_device
*hdev
,
365 struct usb_hub_descriptor
*desc
)
370 if (hub_is_superspeed(hdev
)) {
371 dtype
= USB_DT_SS_HUB
;
372 size
= USB_DT_SS_HUB_SIZE
;
375 size
= sizeof(struct usb_hub_descriptor
);
378 for (i
= 0; i
< 3; i
++) {
379 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
380 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
381 dtype
<< 8, 0, desc
, size
,
382 USB_CTRL_GET_TIMEOUT
);
383 if (hub_is_superspeed(hdev
)) {
386 } else if (ret
>= USB_DT_HUB_NONVAR_SIZE
+ 2) {
387 /* Make sure we have the DeviceRemovable field. */
388 size
= USB_DT_HUB_NONVAR_SIZE
+ desc
->bNbrPorts
/ 8 + 1;
398 * USB 2.0 spec Section 11.24.2.1
400 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
402 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
403 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
407 * USB 2.0 spec Section 11.24.2.2
409 int usb_clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
411 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
412 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
417 * USB 2.0 spec Section 11.24.2.13
419 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
421 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
422 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
426 static char *to_led_name(int selector
)
443 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
444 * for info about using port indicators
446 static void set_port_led(struct usb_hub
*hub
, int port1
, int selector
)
448 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
451 status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
452 USB_PORT_FEAT_INDICATOR
);
453 dev_dbg(&port_dev
->dev
, "indicator %s status %d\n",
454 to_led_name(selector
), status
);
457 #define LED_CYCLE_PERIOD ((2*HZ)/3)
459 static void led_work(struct work_struct
*work
)
461 struct usb_hub
*hub
=
462 container_of(work
, struct usb_hub
, leds
.work
);
463 struct usb_device
*hdev
= hub
->hdev
;
465 unsigned changed
= 0;
468 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
471 for (i
= 0; i
< hdev
->maxchild
; i
++) {
472 unsigned selector
, mode
;
474 /* 30%-50% duty cycle */
476 switch (hub
->indicator
[i
]) {
478 case INDICATOR_CYCLE
:
480 selector
= HUB_LED_AUTO
;
481 mode
= INDICATOR_AUTO
;
483 /* blinking green = sw attention */
484 case INDICATOR_GREEN_BLINK
:
485 selector
= HUB_LED_GREEN
;
486 mode
= INDICATOR_GREEN_BLINK_OFF
;
488 case INDICATOR_GREEN_BLINK_OFF
:
489 selector
= HUB_LED_OFF
;
490 mode
= INDICATOR_GREEN_BLINK
;
492 /* blinking amber = hw attention */
493 case INDICATOR_AMBER_BLINK
:
494 selector
= HUB_LED_AMBER
;
495 mode
= INDICATOR_AMBER_BLINK_OFF
;
497 case INDICATOR_AMBER_BLINK_OFF
:
498 selector
= HUB_LED_OFF
;
499 mode
= INDICATOR_AMBER_BLINK
;
501 /* blink green/amber = reserved */
502 case INDICATOR_ALT_BLINK
:
503 selector
= HUB_LED_GREEN
;
504 mode
= INDICATOR_ALT_BLINK_OFF
;
506 case INDICATOR_ALT_BLINK_OFF
:
507 selector
= HUB_LED_AMBER
;
508 mode
= INDICATOR_ALT_BLINK
;
513 if (selector
!= HUB_LED_AUTO
)
515 set_port_led(hub
, i
+ 1, selector
);
516 hub
->indicator
[i
] = mode
;
518 if (!changed
&& blinkenlights
) {
520 cursor
%= hdev
->maxchild
;
521 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
522 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
526 queue_delayed_work(system_power_efficient_wq
,
527 &hub
->leds
, LED_CYCLE_PERIOD
);
530 /* use a short timeout for hub/port status fetches */
531 #define USB_STS_TIMEOUT 1000
532 #define USB_STS_RETRIES 5
535 * USB 2.0 spec Section 11.24.2.6
537 static int get_hub_status(struct usb_device
*hdev
,
538 struct usb_hub_status
*data
)
540 int i
, status
= -ETIMEDOUT
;
542 for (i
= 0; i
< USB_STS_RETRIES
&&
543 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
544 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
545 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
546 data
, sizeof(*data
), USB_STS_TIMEOUT
);
552 * USB 2.0 spec Section 11.24.2.7
554 static int get_port_status(struct usb_device
*hdev
, int port1
,
555 struct usb_port_status
*data
)
557 int i
, status
= -ETIMEDOUT
;
559 for (i
= 0; i
< USB_STS_RETRIES
&&
560 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
561 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
562 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
563 data
, sizeof(*data
), USB_STS_TIMEOUT
);
568 static int hub_port_status(struct usb_hub
*hub
, int port1
,
569 u16
*status
, u16
*change
)
573 mutex_lock(&hub
->status_mutex
);
574 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
577 dev_err(hub
->intfdev
,
578 "%s failed (err = %d)\n", __func__
, ret
);
582 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
583 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
587 mutex_unlock(&hub
->status_mutex
);
591 static void kick_hub_wq(struct usb_hub
*hub
)
593 struct usb_interface
*intf
;
595 if (hub
->disconnected
|| work_pending(&hub
->events
))
599 * Suppress autosuspend until the event is proceed.
601 * Be careful and make sure that the symmetric operation is
602 * always called. We are here only when there is no pending
603 * work for this hub. Therefore put the interface either when
604 * the new work is called or when it is canceled.
606 intf
= to_usb_interface(hub
->intfdev
);
607 usb_autopm_get_interface_no_resume(intf
);
608 kref_get(&hub
->kref
);
610 if (queue_work(hub_wq
, &hub
->events
))
613 /* the work has already been scheduled */
614 usb_autopm_put_interface_async(intf
);
615 kref_put(&hub
->kref
, hub_release
);
618 void usb_kick_hub_wq(struct usb_device
*hdev
)
620 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
627 * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
628 * Notification, which indicates it had initiated remote wakeup.
630 * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
631 * device initiates resume, so the USB core will not receive notice of the
632 * resume through the normal hub interrupt URB.
634 void usb_wakeup_notification(struct usb_device
*hdev
,
635 unsigned int portnum
)
642 hub
= usb_hub_to_struct_hub(hdev
);
644 set_bit(portnum
, hub
->wakeup_bits
);
648 EXPORT_SYMBOL_GPL(usb_wakeup_notification
);
650 /* completion function, fires on port status changes and various faults */
651 static void hub_irq(struct urb
*urb
)
653 struct usb_hub
*hub
= urb
->context
;
654 int status
= urb
->status
;
659 case -ENOENT
: /* synchronous unlink */
660 case -ECONNRESET
: /* async unlink */
661 case -ESHUTDOWN
: /* hardware going away */
664 default: /* presumably an error */
665 /* Cause a hub reset after 10 consecutive errors */
666 dev_dbg(hub
->intfdev
, "transfer --> %d\n", status
);
667 if ((++hub
->nerrors
< 10) || hub
->error
)
672 /* let hub_wq handle things */
673 case 0: /* we got data: port status changed */
675 for (i
= 0; i
< urb
->actual_length
; ++i
)
676 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
678 hub
->event_bits
[0] = bits
;
684 /* Something happened, let hub_wq figure it out */
691 status
= usb_submit_urb(hub
->urb
, GFP_ATOMIC
);
692 if (status
!= 0 && status
!= -ENODEV
&& status
!= -EPERM
)
693 dev_err(hub
->intfdev
, "resubmit --> %d\n", status
);
696 /* USB 2.0 spec Section 11.24.2.3 */
698 hub_clear_tt_buffer(struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
700 /* Need to clear both directions for control ep */
701 if (((devinfo
>> 11) & USB_ENDPOINT_XFERTYPE_MASK
) ==
702 USB_ENDPOINT_XFER_CONTROL
) {
703 int status
= usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
704 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
,
705 devinfo
^ 0x8000, tt
, NULL
, 0, 1000);
709 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
710 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
715 * enumeration blocks hub_wq for a long time. we use keventd instead, since
716 * long blocking there is the exception, not the rule. accordingly, HCDs
717 * talking to TTs must queue control transfers (not just bulk and iso), so
718 * both can talk to the same hub concurrently.
720 static void hub_tt_work(struct work_struct
*work
)
722 struct usb_hub
*hub
=
723 container_of(work
, struct usb_hub
, tt
.clear_work
);
726 spin_lock_irqsave(&hub
->tt
.lock
, flags
);
727 while (!list_empty(&hub
->tt
.clear_list
)) {
728 struct list_head
*next
;
729 struct usb_tt_clear
*clear
;
730 struct usb_device
*hdev
= hub
->hdev
;
731 const struct hc_driver
*drv
;
734 next
= hub
->tt
.clear_list
.next
;
735 clear
= list_entry(next
, struct usb_tt_clear
, clear_list
);
736 list_del(&clear
->clear_list
);
738 /* drop lock so HCD can concurrently report other TT errors */
739 spin_unlock_irqrestore(&hub
->tt
.lock
, flags
);
740 status
= hub_clear_tt_buffer(hdev
, clear
->devinfo
, clear
->tt
);
741 if (status
&& status
!= -ENODEV
)
743 "clear tt %d (%04x) error %d\n",
744 clear
->tt
, clear
->devinfo
, status
);
746 /* Tell the HCD, even if the operation failed */
747 drv
= clear
->hcd
->driver
;
748 if (drv
->clear_tt_buffer_complete
)
749 (drv
->clear_tt_buffer_complete
)(clear
->hcd
, clear
->ep
);
752 spin_lock_irqsave(&hub
->tt
.lock
, flags
);
754 spin_unlock_irqrestore(&hub
->tt
.lock
, flags
);
758 * usb_hub_set_port_power - control hub port's power state
759 * @hdev: USB device belonging to the usb hub
762 * @set: expected status
764 * call this function to control port's power via setting or
765 * clearing the port's PORT_POWER feature.
767 * Return: 0 if successful. A negative error code otherwise.
769 int usb_hub_set_port_power(struct usb_device
*hdev
, struct usb_hub
*hub
,
775 ret
= set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
777 ret
= usb_clear_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
783 set_bit(port1
, hub
->power_bits
);
785 clear_bit(port1
, hub
->power_bits
);
790 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
791 * @urb: an URB associated with the failed or incomplete split transaction
793 * High speed HCDs use this to tell the hub driver that some split control or
794 * bulk transaction failed in a way that requires clearing internal state of
795 * a transaction translator. This is normally detected (and reported) from
798 * It may not be possible for that hub to handle additional full (or low)
799 * speed transactions until that state is fully cleared out.
801 * Return: 0 if successful. A negative error code otherwise.
803 int usb_hub_clear_tt_buffer(struct urb
*urb
)
805 struct usb_device
*udev
= urb
->dev
;
806 int pipe
= urb
->pipe
;
807 struct usb_tt
*tt
= udev
->tt
;
809 struct usb_tt_clear
*clear
;
811 /* we've got to cope with an arbitrary number of pending TT clears,
812 * since each TT has "at least two" buffers that can need it (and
813 * there can be many TTs per hub). even if they're uncommon.
815 clear
= kmalloc(sizeof *clear
, GFP_ATOMIC
);
817 dev_err(&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
818 /* FIXME recover somehow ... RESET_TT? */
822 /* info that CLEAR_TT_BUFFER needs */
823 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
824 clear
->devinfo
= usb_pipeendpoint (pipe
);
825 clear
->devinfo
|= udev
->devnum
<< 4;
826 clear
->devinfo
|= usb_pipecontrol(pipe
)
827 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
828 : (USB_ENDPOINT_XFER_BULK
<< 11);
829 if (usb_pipein(pipe
))
830 clear
->devinfo
|= 1 << 15;
832 /* info for completion callback */
833 clear
->hcd
= bus_to_hcd(udev
->bus
);
836 /* tell keventd to clear state for this TT */
837 spin_lock_irqsave(&tt
->lock
, flags
);
838 list_add_tail(&clear
->clear_list
, &tt
->clear_list
);
839 schedule_work(&tt
->clear_work
);
840 spin_unlock_irqrestore(&tt
->lock
, flags
);
843 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer
);
845 static void hub_power_on(struct usb_hub
*hub
, bool do_delay
)
849 /* Enable power on each port. Some hubs have reserved values
850 * of LPSM (> 2) in their descriptors, even though they are
851 * USB 2.0 hubs. Some hubs do not implement port-power switching
852 * but only emulate it. In all cases, the ports won't work
853 * unless we send these messages to the hub.
855 if (hub_is_port_power_switchable(hub
))
856 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
858 dev_dbg(hub
->intfdev
, "trying to enable port power on "
859 "non-switchable hub\n");
860 for (port1
= 1; port1
<= hub
->hdev
->maxchild
; port1
++)
861 if (test_bit(port1
, hub
->power_bits
))
862 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
864 usb_clear_port_feature(hub
->hdev
, port1
,
865 USB_PORT_FEAT_POWER
);
867 msleep(hub_power_on_good_delay(hub
));
870 static int hub_hub_status(struct usb_hub
*hub
,
871 u16
*status
, u16
*change
)
875 mutex_lock(&hub
->status_mutex
);
876 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
879 dev_err(hub
->intfdev
,
880 "%s failed (err = %d)\n", __func__
, ret
);
882 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
883 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
886 mutex_unlock(&hub
->status_mutex
);
890 static int hub_set_port_link_state(struct usb_hub
*hub
, int port1
,
891 unsigned int link_status
)
893 return set_port_feature(hub
->hdev
,
894 port1
| (link_status
<< 3),
895 USB_PORT_FEAT_LINK_STATE
);
899 * Disable a port and mark a logical connect-change event, so that some
900 * time later hub_wq will disconnect() any existing usb_device on the port
901 * and will re-enumerate if there actually is a device attached.
903 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
905 #ifdef CONFIG_USB_DEBUG_DETAILED_LOG
906 dev_info(&hub
->ports
[port1
- 1]->dev
, "logical disconnect\n");
908 dev_dbg(&hub
->ports
[port1
- 1]->dev
, "logical disconnect\n");
910 hub_port_disable(hub
, port1
, 1);
912 /* FIXME let caller ask to power down the port:
913 * - some devices won't enumerate without a VBUS power cycle
914 * - SRP saves power that way
915 * - ... new call, TBD ...
916 * That's easy if this hub can switch power per-port, and
917 * hub_wq reactivates the port later (timer, SRP, etc).
918 * Powerdown must be optional, because of reset/DFU.
921 set_bit(port1
, hub
->change_bits
);
926 * usb_remove_device - disable a device's port on its parent hub
927 * @udev: device to be disabled and removed
928 * Context: @udev locked, must be able to sleep.
930 * After @udev's port has been disabled, hub_wq is notified and it will
931 * see that the device has been disconnected. When the device is
932 * physically unplugged and something is plugged in, the events will
933 * be received and processed normally.
935 * Return: 0 if successful. A negative error code otherwise.
937 int usb_remove_device(struct usb_device
*udev
)
940 struct usb_interface
*intf
;
942 if (!udev
->parent
) /* Can't remove a root hub */
944 hub
= usb_hub_to_struct_hub(udev
->parent
);
945 intf
= to_usb_interface(hub
->intfdev
);
947 usb_autopm_get_interface(intf
);
948 set_bit(udev
->portnum
, hub
->removed_bits
);
949 hub_port_logical_disconnect(hub
, udev
->portnum
);
950 usb_autopm_put_interface(intf
);
954 enum hub_activation_type
{
955 HUB_INIT
, HUB_INIT2
, HUB_INIT3
, /* INITs must come first */
956 HUB_POST_RESET
, HUB_RESUME
, HUB_RESET_RESUME
,
959 static void hub_init_func2(struct work_struct
*ws
);
960 static void hub_init_func3(struct work_struct
*ws
);
962 static void hub_activate(struct usb_hub
*hub
, enum hub_activation_type type
)
964 struct usb_device
*hdev
= hub
->hdev
;
969 bool need_debounce_delay
= false;
972 /* Continue a partial initialization */
973 if (type
== HUB_INIT2
|| type
== HUB_INIT3
) {
974 device_lock(&hdev
->dev
);
976 /* Was the hub disconnected while we were waiting? */
977 if (hub
->disconnected
)
979 if (type
== HUB_INIT2
)
983 kref_get(&hub
->kref
);
985 /* The superspeed hub except for root hub has to use Hub Depth
986 * value as an offset into the route string to locate the bits
987 * it uses to determine the downstream port number. So hub driver
988 * should send a set hub depth request to superspeed hub after
989 * the superspeed hub is set configuration in initialization or
992 * After a resume, port power should still be on.
993 * For any other type of activation, turn it on.
995 if (type
!= HUB_RESUME
) {
996 if (hdev
->parent
&& hub_is_superspeed(hdev
)) {
997 ret
= usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
998 HUB_SET_DEPTH
, USB_RT_HUB
,
999 hdev
->level
- 1, 0, NULL
, 0,
1000 USB_CTRL_SET_TIMEOUT
);
1002 dev_err(hub
->intfdev
,
1003 "set hub depth failed\n");
1006 /* Speed up system boot by using a delayed_work for the
1007 * hub's initial power-up delays. This is pretty awkward
1008 * and the implementation looks like a home-brewed sort of
1009 * setjmp/longjmp, but it saves at least 100 ms for each
1010 * root hub (assuming usbcore is compiled into the kernel
1011 * rather than as a module). It adds up.
1013 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
1014 * because for those activation types the ports have to be
1015 * operational when we return. In theory this could be done
1016 * for HUB_POST_RESET, but it's easier not to.
1018 if (type
== HUB_INIT
) {
1019 delay
= hub_power_on_good_delay(hub
);
1021 hub_power_on(hub
, false);
1022 INIT_DELAYED_WORK(&hub
->init_work
, hub_init_func2
);
1023 queue_delayed_work(system_power_efficient_wq
,
1025 msecs_to_jiffies(delay
));
1027 /* Suppress autosuspend until init is done */
1028 usb_autopm_get_interface_no_resume(
1029 to_usb_interface(hub
->intfdev
));
1030 return; /* Continues at init2: below */
1031 } else if (type
== HUB_RESET_RESUME
) {
1032 /* The internal host controller state for the hub device
1033 * may be gone after a host power loss on system resume.
1034 * Update the device's info so the HW knows it's a hub.
1036 hcd
= bus_to_hcd(hdev
->bus
);
1037 if (hcd
->driver
->update_hub_device
) {
1038 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1039 &hub
->tt
, GFP_NOIO
);
1041 dev_err(hub
->intfdev
, "Host not "
1042 "accepting hub info "
1044 dev_err(hub
->intfdev
, "LS/FS devices "
1045 "and hubs may not work "
1046 "under this hub\n.");
1049 hub_power_on(hub
, true);
1051 hub_power_on(hub
, true);
1057 * Check each port and set hub->change_bits to let hub_wq know
1058 * which ports need attention.
1060 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
1061 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
1062 struct usb_device
*udev
= port_dev
->child
;
1063 u16 portstatus
, portchange
;
1065 portstatus
= portchange
= 0;
1066 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1070 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
1071 dev_dbg(&port_dev
->dev
, "status %04x change %04x\n",
1072 portstatus
, portchange
);
1075 * After anything other than HUB_RESUME (i.e., initialization
1076 * or any sort of reset), every port should be disabled.
1077 * Unconnected ports should likewise be disabled (paranoia),
1078 * and so should ports for which we have no usb_device.
1080 if ((portstatus
& USB_PORT_STAT_ENABLE
) && (
1081 type
!= HUB_RESUME
||
1082 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
1084 udev
->state
== USB_STATE_NOTATTACHED
)) {
1086 * USB3 protocol ports will automatically transition
1087 * to Enabled state when detect an USB3.0 device attach.
1088 * Do not disable USB3 protocol ports, just pretend
1091 portstatus
&= ~USB_PORT_STAT_ENABLE
;
1092 if (!hub_is_superspeed(hdev
))
1093 usb_clear_port_feature(hdev
, port1
,
1094 USB_PORT_FEAT_ENABLE
);
1097 /* Clear status-change flags; we'll debounce later */
1098 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
1099 need_debounce_delay
= true;
1100 usb_clear_port_feature(hub
->hdev
, port1
,
1101 USB_PORT_FEAT_C_CONNECTION
);
1103 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
1104 need_debounce_delay
= true;
1105 usb_clear_port_feature(hub
->hdev
, port1
,
1106 USB_PORT_FEAT_C_ENABLE
);
1108 if (portchange
& USB_PORT_STAT_C_RESET
) {
1109 need_debounce_delay
= true;
1110 usb_clear_port_feature(hub
->hdev
, port1
,
1111 USB_PORT_FEAT_C_RESET
);
1113 if ((portchange
& USB_PORT_STAT_C_BH_RESET
) &&
1114 hub_is_superspeed(hub
->hdev
)) {
1115 need_debounce_delay
= true;
1116 usb_clear_port_feature(hub
->hdev
, port1
,
1117 USB_PORT_FEAT_C_BH_PORT_RESET
);
1119 /* We can forget about a "removed" device when there's a
1120 * physical disconnect or the connect status changes.
1122 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
1123 (portchange
& USB_PORT_STAT_C_CONNECTION
))
1124 clear_bit(port1
, hub
->removed_bits
);
1126 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
1127 /* Tell hub_wq to disconnect the device or
1128 * check for a new connection
1130 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
) ||
1131 (portstatus
& USB_PORT_STAT_OVERCURRENT
))
1132 set_bit(port1
, hub
->change_bits
);
1134 } else if (portstatus
& USB_PORT_STAT_ENABLE
) {
1135 bool port_resumed
= (portstatus
&
1136 USB_PORT_STAT_LINK_STATE
) ==
1138 /* The power session apparently survived the resume.
1139 * If there was an overcurrent or suspend change
1140 * (i.e., remote wakeup request), have hub_wq
1141 * take care of it. Look at the port link state
1142 * for USB 3.0 hubs, since they don't have a suspend
1143 * change bit, and they don't set the port link change
1144 * bit on device-initiated resume.
1146 if (portchange
|| (hub_is_superspeed(hub
->hdev
) &&
1148 set_bit(port1
, hub
->change_bits
);
1150 } else if (udev
->persist_enabled
) {
1152 udev
->reset_resume
= 1;
1154 /* Don't set the change_bits when the device
1157 if (test_bit(port1
, hub
->power_bits
))
1158 set_bit(port1
, hub
->change_bits
);
1161 /* The power session is gone; tell hub_wq */
1162 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1163 set_bit(port1
, hub
->change_bits
);
1167 /* If no port-status-change flags were set, we don't need any
1168 * debouncing. If flags were set we can try to debounce the
1169 * ports all at once right now, instead of letting hub_wq do them
1170 * one at a time later on.
1172 * If any port-status changes do occur during this delay, hub_wq
1173 * will see them later and handle them normally.
1175 if (need_debounce_delay
) {
1176 delay
= HUB_DEBOUNCE_STABLE
;
1178 /* Don't do a long sleep inside a workqueue routine */
1179 if (type
== HUB_INIT2
) {
1180 INIT_DELAYED_WORK(&hub
->init_work
, hub_init_func3
);
1181 queue_delayed_work(system_power_efficient_wq
,
1183 msecs_to_jiffies(delay
));
1184 device_unlock(&hdev
->dev
);
1185 return; /* Continues at init3: below */
1193 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
1195 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
1196 if (hub
->has_indicators
&& blinkenlights
)
1197 queue_delayed_work(system_power_efficient_wq
,
1198 &hub
->leds
, LED_CYCLE_PERIOD
);
1200 /* Scan all ports that need attention */
1203 if (type
== HUB_INIT2
|| type
== HUB_INIT3
) {
1204 /* Allow autosuspend if it was suppressed */
1206 usb_autopm_put_interface_async(to_usb_interface(hub
->intfdev
));
1207 device_unlock(&hdev
->dev
);
1210 kref_put(&hub
->kref
, hub_release
);
1213 /* Implement the continuations for the delays above */
1214 static void hub_init_func2(struct work_struct
*ws
)
1216 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
1218 hub_activate(hub
, HUB_INIT2
);
1221 static void hub_init_func3(struct work_struct
*ws
)
1223 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
1225 hub_activate(hub
, HUB_INIT3
);
1228 enum hub_quiescing_type
{
1229 HUB_DISCONNECT
, HUB_PRE_RESET
, HUB_SUSPEND
1232 static void hub_quiesce(struct usb_hub
*hub
, enum hub_quiescing_type type
)
1234 struct usb_device
*hdev
= hub
->hdev
;
1237 /* hub_wq and related activity won't re-trigger */
1240 if (type
!= HUB_SUSPEND
) {
1241 /* Disconnect all the children */
1242 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
1243 if (hub
->ports
[i
]->child
)
1244 usb_disconnect(&hub
->ports
[i
]->child
);
1248 /* Stop hub_wq and related activity */
1249 usb_kill_urb(hub
->urb
);
1250 if (hub
->has_indicators
)
1251 cancel_delayed_work_sync(&hub
->leds
);
1253 flush_work(&hub
->tt
.clear_work
);
1256 static void hub_pm_barrier_for_all_ports(struct usb_hub
*hub
)
1260 for (i
= 0; i
< hub
->hdev
->maxchild
; ++i
)
1261 pm_runtime_barrier(&hub
->ports
[i
]->dev
);
1264 /* caller has locked the hub device */
1265 static int hub_pre_reset(struct usb_interface
*intf
)
1267 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1269 hub_quiesce(hub
, HUB_PRE_RESET
);
1271 hub_pm_barrier_for_all_ports(hub
);
1275 /* caller has locked the hub device */
1276 static int hub_post_reset(struct usb_interface
*intf
)
1278 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1281 hub_pm_barrier_for_all_ports(hub
);
1282 hub_activate(hub
, HUB_POST_RESET
);
1286 static int hub_configure(struct usb_hub
*hub
,
1287 struct usb_endpoint_descriptor
*endpoint
)
1289 struct usb_hcd
*hcd
;
1290 struct usb_device
*hdev
= hub
->hdev
;
1291 struct device
*hub_dev
= hub
->intfdev
;
1292 u16 hubstatus
, hubchange
;
1293 u16 wHubCharacteristics
;
1296 char *message
= "out of memory";
1301 hub
->buffer
= kmalloc(sizeof(*hub
->buffer
), GFP_KERNEL
);
1307 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
1312 mutex_init(&hub
->status_mutex
);
1314 hub
->descriptor
= kzalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
1315 if (!hub
->descriptor
) {
1320 /* Request the entire hub descriptor.
1321 * hub->descriptor can handle USB_MAXCHILDREN ports,
1322 * but a (non-SS) hub can/will return fewer bytes here.
1324 ret
= get_hub_descriptor(hdev
, hub
->descriptor
);
1326 message
= "can't read hub descriptor";
1330 maxchild
= USB_MAXCHILDREN
;
1331 if (hub_is_superspeed(hdev
))
1332 maxchild
= min_t(unsigned, maxchild
, USB_SS_MAXPORTS
);
1334 if (hub
->descriptor
->bNbrPorts
> maxchild
) {
1335 message
= "hub has too many ports!";
1338 } else if (hub
->descriptor
->bNbrPorts
== 0) {
1339 message
= "hub doesn't have any ports!";
1344 maxchild
= hub
->descriptor
->bNbrPorts
;
1345 dev_info(hub_dev
, "%d port%s detected\n", maxchild
,
1346 (maxchild
== 1) ? "" : "s");
1348 hub
->ports
= kzalloc(maxchild
* sizeof(struct usb_port
*), GFP_KERNEL
);
1354 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
1355 if (hub_is_superspeed(hdev
)) {
1363 /* FIXME for USB 3.0, skip for now */
1364 if ((wHubCharacteristics
& HUB_CHAR_COMPOUND
) &&
1365 !(hub_is_superspeed(hdev
))) {
1366 char portstr
[USB_MAXCHILDREN
+ 1];
1368 for (i
= 0; i
< maxchild
; i
++)
1369 portstr
[i
] = hub
->descriptor
->u
.hs
.DeviceRemovable
1370 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
1372 portstr
[maxchild
] = 0;
1373 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
1375 dev_dbg(hub_dev
, "standalone hub\n");
1377 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
1378 case HUB_CHAR_COMMON_LPSM
:
1379 dev_dbg(hub_dev
, "ganged power switching\n");
1381 case HUB_CHAR_INDV_PORT_LPSM
:
1382 dev_dbg(hub_dev
, "individual port power switching\n");
1384 case HUB_CHAR_NO_LPSM
:
1386 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
1390 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
1391 case HUB_CHAR_COMMON_OCPM
:
1392 dev_dbg(hub_dev
, "global over-current protection\n");
1394 case HUB_CHAR_INDV_PORT_OCPM
:
1395 dev_dbg(hub_dev
, "individual port over-current protection\n");
1397 case HUB_CHAR_NO_OCPM
:
1399 dev_dbg(hub_dev
, "no over-current protection\n");
1403 spin_lock_init(&hub
->tt
.lock
);
1404 INIT_LIST_HEAD(&hub
->tt
.clear_list
);
1405 INIT_WORK(&hub
->tt
.clear_work
, hub_tt_work
);
1406 switch (hdev
->descriptor
.bDeviceProtocol
) {
1409 case USB_HUB_PR_HS_SINGLE_TT
:
1410 dev_dbg(hub_dev
, "Single TT\n");
1413 case USB_HUB_PR_HS_MULTI_TT
:
1414 ret
= usb_set_interface(hdev
, 0, 1);
1416 dev_dbg(hub_dev
, "TT per port\n");
1419 dev_err(hub_dev
, "Using single TT (err %d)\n",
1424 /* USB 3.0 hubs don't have a TT */
1427 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
1428 hdev
->descriptor
.bDeviceProtocol
);
1432 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1433 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
1434 case HUB_TTTT_8_BITS
:
1435 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
1436 hub
->tt
.think_time
= 666;
1437 dev_dbg(hub_dev
, "TT requires at most %d "
1438 "FS bit times (%d ns)\n",
1439 8, hub
->tt
.think_time
);
1442 case HUB_TTTT_16_BITS
:
1443 hub
->tt
.think_time
= 666 * 2;
1444 dev_dbg(hub_dev
, "TT requires at most %d "
1445 "FS bit times (%d ns)\n",
1446 16, hub
->tt
.think_time
);
1448 case HUB_TTTT_24_BITS
:
1449 hub
->tt
.think_time
= 666 * 3;
1450 dev_dbg(hub_dev
, "TT requires at most %d "
1451 "FS bit times (%d ns)\n",
1452 24, hub
->tt
.think_time
);
1454 case HUB_TTTT_32_BITS
:
1455 hub
->tt
.think_time
= 666 * 4;
1456 dev_dbg(hub_dev
, "TT requires at most %d "
1457 "FS bit times (%d ns)\n",
1458 32, hub
->tt
.think_time
);
1462 /* probe() zeroes hub->indicator[] */
1463 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
1464 hub
->has_indicators
= 1;
1465 dev_dbg(hub_dev
, "Port indicators are supported\n");
1468 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
1469 hub
->descriptor
->bPwrOn2PwrGood
* 2);
1471 /* power budgeting mostly matters with bus-powered hubs,
1472 * and battery-powered root hubs (may provide just 8 mA).
1474 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
1476 message
= "can't get hub status";
1479 hcd
= bus_to_hcd(hdev
->bus
);
1480 if (hdev
== hdev
->bus
->root_hub
) {
1481 if (hcd
->power_budget
> 0)
1482 hdev
->bus_mA
= hcd
->power_budget
;
1484 hdev
->bus_mA
= full_load
* maxchild
;
1485 if (hdev
->bus_mA
>= full_load
)
1486 hub
->mA_per_port
= full_load
;
1488 hub
->mA_per_port
= hdev
->bus_mA
;
1489 hub
->limited_power
= 1;
1491 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
1492 int remaining
= hdev
->bus_mA
-
1493 hub
->descriptor
->bHubContrCurrent
;
1495 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
1496 hub
->descriptor
->bHubContrCurrent
);
1497 hub
->limited_power
= 1;
1499 if (remaining
< maxchild
* unit_load
)
1501 "insufficient power available "
1502 "to use all downstream ports\n");
1503 hub
->mA_per_port
= unit_load
; /* 7.2.1 */
1505 } else { /* Self-powered external hub */
1506 /* FIXME: What about battery-powered external hubs that
1507 * provide less current per port? */
1508 hub
->mA_per_port
= full_load
;
1510 if (hub
->mA_per_port
< full_load
)
1511 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
1514 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
1516 message
= "can't get hub status";
1520 /* local power status reports aren't always correct */
1521 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
1522 dev_dbg(hub_dev
, "local power source is %s\n",
1523 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
1524 ? "lost (inactive)" : "good");
1526 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
1527 dev_dbg(hub_dev
, "%sover-current condition exists\n",
1528 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
1530 /* set up the interrupt endpoint
1531 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1532 * bytes as USB2.0[11.12.3] says because some hubs are known
1533 * to send more data (and thus cause overflow). For root hubs,
1534 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1535 * to be big enough for at least USB_MAXCHILDREN ports. */
1536 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
1537 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
1539 if (maxp
> sizeof(*hub
->buffer
))
1540 maxp
= sizeof(*hub
->buffer
);
1542 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
1548 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
1549 hub
, endpoint
->bInterval
);
1551 /* maybe cycle the hub leds */
1552 if (hub
->has_indicators
&& blinkenlights
)
1553 hub
->indicator
[0] = INDICATOR_CYCLE
;
1555 mutex_lock(&usb_port_peer_mutex
);
1556 for (i
= 0; i
< maxchild
; i
++) {
1557 ret
= usb_hub_create_port_device(hub
, i
+ 1);
1559 dev_err(hub
->intfdev
,
1560 "couldn't create port%d device.\n", i
+ 1);
1565 for (i
= 0; i
< hdev
->maxchild
; i
++) {
1566 struct usb_port
*port_dev
= hub
->ports
[i
];
1568 pm_runtime_put(&port_dev
->dev
);
1571 mutex_unlock(&usb_port_peer_mutex
);
1575 /* Update the HCD's internal representation of this hub before hub_wq
1576 * starts getting port status changes for devices under the hub.
1578 if (hcd
->driver
->update_hub_device
) {
1579 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1580 &hub
->tt
, GFP_KERNEL
);
1582 message
= "can't update HCD hub info";
1587 usb_hub_adjust_deviceremovable(hdev
, hub
->descriptor
);
1589 hub_activate(hub
, HUB_INIT
);
1593 dev_err(hub_dev
, "config failed, %s (err %d)\n",
1595 /* hub_disconnect() frees urb and descriptor */
1599 static void hub_release(struct kref
*kref
)
1601 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1603 usb_put_dev(hub
->hdev
);
1604 usb_put_intf(to_usb_interface(hub
->intfdev
));
1608 static unsigned highspeed_hubs
;
1610 static void hub_disconnect(struct usb_interface
*intf
)
1612 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1613 struct usb_device
*hdev
= interface_to_usbdev(intf
);
1617 * Stop adding new hub events. We do not want to block here and thus
1618 * will not try to remove any pending work item.
1620 hub
->disconnected
= 1;
1622 /* Disconnect all children and quiesce the hub */
1624 hub_quiesce(hub
, HUB_DISCONNECT
);
1626 mutex_lock(&usb_port_peer_mutex
);
1628 /* Avoid races with recursively_mark_NOTATTACHED() */
1629 spin_lock_irq(&device_state_lock
);
1630 port1
= hdev
->maxchild
;
1632 usb_set_intfdata(intf
, NULL
);
1633 spin_unlock_irq(&device_state_lock
);
1635 for (; port1
> 0; --port1
)
1636 usb_hub_remove_port_device(hub
, port1
);
1638 mutex_unlock(&usb_port_peer_mutex
);
1640 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1643 usb_free_urb(hub
->urb
);
1645 kfree(hub
->descriptor
);
1649 pm_suspend_ignore_children(&intf
->dev
, false);
1650 kref_put(&hub
->kref
, hub_release
);
1653 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1655 struct usb_host_interface
*desc
;
1656 struct usb_endpoint_descriptor
*endpoint
;
1657 struct usb_device
*hdev
;
1658 struct usb_hub
*hub
;
1660 desc
= intf
->cur_altsetting
;
1661 hdev
= interface_to_usbdev(intf
);
1664 * Set default autosuspend delay as 0 to speedup bus suspend,
1665 * based on the below considerations:
1667 * - Unlike other drivers, the hub driver does not rely on the
1668 * autosuspend delay to provide enough time to handle a wakeup
1669 * event, and the submitted status URB is just to check future
1670 * change on hub downstream ports, so it is safe to do it.
1672 * - The patch might cause one or more auto supend/resume for
1673 * below very rare devices when they are plugged into hub
1676 * devices having trouble initializing, and disconnect
1677 * themselves from the bus and then reconnect a second
1680 * devices just for downloading firmware, and disconnects
1681 * themselves after completing it
1683 * For these quite rare devices, their drivers may change the
1684 * autosuspend delay of their parent hub in the probe() to one
1685 * appropriate value to avoid the subtle problem if someone
1688 * - The patch may cause one or more auto suspend/resume on
1689 * hub during running 'lsusb', but it is probably too
1690 * infrequent to worry about.
1692 * - Change autosuspend delay of hub can avoid unnecessary auto
1693 * suspend timer for hub, also may decrease power consumption
1696 * - If user has indicated to prevent autosuspend by passing
1697 * usbcore.autosuspend = -1 then keep autosuspend disabled.
1700 if (hdev
->dev
.power
.autosuspend_delay
>= 0)
1701 pm_runtime_set_autosuspend_delay(&hdev
->dev
, 0);
1705 * Hubs have proper suspend/resume support, except for root hubs
1706 * where the controller driver doesn't have bus_suspend and
1707 * bus_resume methods.
1709 if (hdev
->parent
) { /* normal device */
1710 usb_enable_autosuspend(hdev
);
1711 } else { /* root hub */
1712 const struct hc_driver
*drv
= bus_to_hcd(hdev
->bus
)->driver
;
1714 if (drv
->bus_suspend
&& drv
->bus_resume
)
1715 usb_enable_autosuspend(hdev
);
1718 if (hdev
->level
== MAX_TOPO_LEVEL
) {
1720 "Unsupported bus topology: hub nested too deep\n");
1724 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1726 dev_warn(&intf
->dev
, "ignoring external hub\n");
1731 /* Some hubs have a subclass of 1, which AFAICT according to the */
1732 /* specs is not defined, but it works */
1733 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1734 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1736 dev_err(&intf
->dev
, "bad descriptor, ignoring hub\n");
1740 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1741 if (desc
->desc
.bNumEndpoints
!= 1)
1742 goto descriptor_error
;
1744 endpoint
= &desc
->endpoint
[0].desc
;
1746 /* If it's not an interrupt in endpoint, we'd better punt! */
1747 if (!usb_endpoint_is_int_in(endpoint
))
1748 goto descriptor_error
;
1750 /* We found a hub */
1751 dev_info(&intf
->dev
, "USB hub found\n");
1753 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1755 dev_dbg(&intf
->dev
, "couldn't kmalloc hub struct\n");
1759 kref_init(&hub
->kref
);
1760 hub
->intfdev
= &intf
->dev
;
1762 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1763 INIT_DELAYED_WORK(&hub
->init_work
, NULL
);
1764 INIT_WORK(&hub
->events
, hub_event
);
1768 usb_set_intfdata(intf
, hub
);
1769 intf
->needs_remote_wakeup
= 1;
1770 pm_suspend_ignore_children(&intf
->dev
, true);
1772 if (hdev
->speed
== USB_SPEED_HIGH
)
1775 if (id
->driver_info
& HUB_QUIRK_CHECK_PORT_AUTOSUSPEND
)
1776 hub
->quirk_check_port_auto_suspend
= 1;
1778 if (hub_configure(hub
, endpoint
) >= 0)
1781 hub_disconnect(intf
);
1786 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1788 struct usb_device
*hdev
= interface_to_usbdev(intf
);
1789 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
1791 /* assert ifno == 0 (part of hub spec) */
1793 case USBDEVFS_HUB_PORTINFO
: {
1794 struct usbdevfs_hub_portinfo
*info
= user_data
;
1797 spin_lock_irq(&device_state_lock
);
1798 if (hdev
->devnum
<= 0)
1801 info
->nports
= hdev
->maxchild
;
1802 for (i
= 0; i
< info
->nports
; i
++) {
1803 if (hub
->ports
[i
]->child
== NULL
)
1807 hub
->ports
[i
]->child
->devnum
;
1810 spin_unlock_irq(&device_state_lock
);
1812 return info
->nports
+ 1;
1821 * Allow user programs to claim ports on a hub. When a device is attached
1822 * to one of these "claimed" ports, the program will "own" the device.
1824 static int find_port_owner(struct usb_device
*hdev
, unsigned port1
,
1825 struct usb_dev_state
***ppowner
)
1827 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
1829 if (hdev
->state
== USB_STATE_NOTATTACHED
)
1831 if (port1
== 0 || port1
> hdev
->maxchild
)
1834 /* Devices not managed by the hub driver
1835 * will always have maxchild equal to 0.
1837 *ppowner
= &(hub
->ports
[port1
- 1]->port_owner
);
1841 /* In the following three functions, the caller must hold hdev's lock */
1842 int usb_hub_claim_port(struct usb_device
*hdev
, unsigned port1
,
1843 struct usb_dev_state
*owner
)
1846 struct usb_dev_state
**powner
;
1848 rc
= find_port_owner(hdev
, port1
, &powner
);
1856 EXPORT_SYMBOL_GPL(usb_hub_claim_port
);
1858 int usb_hub_release_port(struct usb_device
*hdev
, unsigned port1
,
1859 struct usb_dev_state
*owner
)
1862 struct usb_dev_state
**powner
;
1864 rc
= find_port_owner(hdev
, port1
, &powner
);
1867 if (*powner
!= owner
)
1872 EXPORT_SYMBOL_GPL(usb_hub_release_port
);
1874 void usb_hub_release_all_ports(struct usb_device
*hdev
, struct usb_dev_state
*owner
)
1876 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
1879 for (n
= 0; n
< hdev
->maxchild
; n
++) {
1880 if (hub
->ports
[n
]->port_owner
== owner
)
1881 hub
->ports
[n
]->port_owner
= NULL
;
1886 /* The caller must hold udev's lock */
1887 bool usb_device_is_owned(struct usb_device
*udev
)
1889 struct usb_hub
*hub
;
1891 if (udev
->state
== USB_STATE_NOTATTACHED
|| !udev
->parent
)
1893 hub
= usb_hub_to_struct_hub(udev
->parent
);
1894 return !!hub
->ports
[udev
->portnum
- 1]->port_owner
;
1897 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
1899 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
1902 for (i
= 0; i
< udev
->maxchild
; ++i
) {
1903 if (hub
->ports
[i
]->child
)
1904 recursively_mark_NOTATTACHED(hub
->ports
[i
]->child
);
1906 if (udev
->state
== USB_STATE_SUSPENDED
)
1907 udev
->active_duration
-= jiffies
;
1908 udev
->state
= USB_STATE_NOTATTACHED
;
1912 * usb_set_device_state - change a device's current state (usbcore, hcds)
1913 * @udev: pointer to device whose state should be changed
1914 * @new_state: new state value to be stored
1916 * udev->state is _not_ fully protected by the device lock. Although
1917 * most transitions are made only while holding the lock, the state can
1918 * can change to USB_STATE_NOTATTACHED at almost any time. This
1919 * is so that devices can be marked as disconnected as soon as possible,
1920 * without having to wait for any semaphores to be released. As a result,
1921 * all changes to any device's state must be protected by the
1922 * device_state_lock spinlock.
1924 * Once a device has been added to the device tree, all changes to its state
1925 * should be made using this routine. The state should _not_ be set directly.
1927 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1928 * Otherwise udev->state is set to new_state, and if new_state is
1929 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1930 * to USB_STATE_NOTATTACHED.
1932 void usb_set_device_state(struct usb_device
*udev
,
1933 enum usb_device_state new_state
)
1935 unsigned long flags
;
1938 spin_lock_irqsave(&device_state_lock
, flags
);
1939 if (udev
->state
== USB_STATE_NOTATTACHED
)
1941 else if (new_state
!= USB_STATE_NOTATTACHED
) {
1943 /* root hub wakeup capabilities are managed out-of-band
1944 * and may involve silicon errata ... ignore them here.
1947 if (udev
->state
== USB_STATE_SUSPENDED
1948 || new_state
== USB_STATE_SUSPENDED
)
1949 ; /* No change to wakeup settings */
1950 else if (new_state
== USB_STATE_CONFIGURED
)
1951 wakeup
= (udev
->quirks
&
1952 USB_QUIRK_IGNORE_REMOTE_WAKEUP
) ? 0 :
1953 udev
->actconfig
->desc
.bmAttributes
&
1954 USB_CONFIG_ATT_WAKEUP
;
1958 if (udev
->state
== USB_STATE_SUSPENDED
&&
1959 new_state
!= USB_STATE_SUSPENDED
)
1960 udev
->active_duration
-= jiffies
;
1961 else if (new_state
== USB_STATE_SUSPENDED
&&
1962 udev
->state
!= USB_STATE_SUSPENDED
)
1963 udev
->active_duration
+= jiffies
;
1964 udev
->state
= new_state
;
1966 recursively_mark_NOTATTACHED(udev
);
1967 spin_unlock_irqrestore(&device_state_lock
, flags
);
1969 device_set_wakeup_capable(&udev
->dev
, wakeup
);
1971 EXPORT_SYMBOL_GPL(usb_set_device_state
);
1974 * Choose a device number.
1976 * Device numbers are used as filenames in usbfs. On USB-1.1 and
1977 * USB-2.0 buses they are also used as device addresses, however on
1978 * USB-3.0 buses the address is assigned by the controller hardware
1979 * and it usually is not the same as the device number.
1981 * WUSB devices are simple: they have no hubs behind, so the mapping
1982 * device <-> virtual port number becomes 1:1. Why? to simplify the
1983 * life of the device connection logic in
1984 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
1985 * handshake we need to assign a temporary address in the unauthorized
1986 * space. For simplicity we use the first virtual port number found to
1987 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
1988 * and that becomes it's address [X < 128] or its unauthorized address
1991 * We add 1 as an offset to the one-based USB-stack port number
1992 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
1993 * 0 is reserved by USB for default address; (b) Linux's USB stack
1994 * uses always #1 for the root hub of the controller. So USB stack's
1995 * port #1, which is wusb virtual-port #0 has address #2.
1997 * Devices connected under xHCI are not as simple. The host controller
1998 * supports virtualization, so the hardware assigns device addresses and
1999 * the HCD must setup data structures before issuing a set address
2000 * command to the hardware.
2002 static void choose_devnum(struct usb_device
*udev
)
2005 struct usb_bus
*bus
= udev
->bus
;
2007 /* be safe when more hub events are proceed in parallel */
2008 mutex_lock(&bus
->devnum_next_mutex
);
2010 devnum
= udev
->portnum
+ 1;
2011 BUG_ON(test_bit(devnum
, bus
->devmap
.devicemap
));
2013 /* Try to allocate the next devnum beginning at
2014 * bus->devnum_next. */
2015 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
2018 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
,
2020 bus
->devnum_next
= (devnum
>= 127 ? 1 : devnum
+ 1);
2023 set_bit(devnum
, bus
->devmap
.devicemap
);
2024 udev
->devnum
= devnum
;
2026 mutex_unlock(&bus
->devnum_next_mutex
);
2029 static void release_devnum(struct usb_device
*udev
)
2031 if (udev
->devnum
> 0) {
2032 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
2037 static void update_devnum(struct usb_device
*udev
, int devnum
)
2039 /* The address for a WUSB device is managed by wusbcore. */
2041 udev
->devnum
= devnum
;
2044 static void hub_free_dev(struct usb_device
*udev
)
2046 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2048 /* Root hubs aren't real devices, so don't free HCD resources */
2049 if (hcd
->driver
->free_dev
&& udev
->parent
)
2050 hcd
->driver
->free_dev(hcd
, udev
);
2053 static void hub_disconnect_children(struct usb_device
*udev
)
2055 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
2058 /* Free up all the children before we remove this device */
2059 for (i
= 0; i
< udev
->maxchild
; i
++) {
2060 if (hub
->ports
[i
]->child
)
2061 usb_disconnect(&hub
->ports
[i
]->child
);
2066 * usb_disconnect - disconnect a device (usbcore-internal)
2067 * @pdev: pointer to device being disconnected
2068 * Context: !in_interrupt ()
2070 * Something got disconnected. Get rid of it and all of its children.
2072 * If *pdev is a normal device then the parent hub must already be locked.
2073 * If *pdev is a root hub then the caller must hold the usb_bus_list_lock,
2074 * which protects the set of root hubs as well as the list of buses.
2076 * Only hub drivers (including virtual root hub drivers for host
2077 * controllers) should ever call this.
2079 * This call is synchronous, and may not be used in an interrupt context.
2081 void usb_disconnect(struct usb_device
**pdev
)
2083 struct usb_port
*port_dev
= NULL
;
2084 struct usb_device
*udev
= *pdev
;
2085 struct usb_hub
*hub
= NULL
;
2088 /* mark the device as inactive, so any further urb submissions for
2089 * this device (and any of its children) will fail immediately.
2090 * this quiesces everything except pending urbs.
2092 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
2093 dev_info(&udev
->dev
, "USB disconnect, device number %d\n",
2097 * Ensure that the pm runtime code knows that the USB device
2098 * is in the process of being disconnected.
2100 pm_runtime_barrier(&udev
->dev
);
2102 usb_lock_device(udev
);
2104 hub_disconnect_children(udev
);
2106 /* deallocate hcd/hardware state ... nuking all pending urbs and
2107 * cleaning up all state associated with the current configuration
2108 * so that the hardware is now fully quiesced.
2110 dev_dbg(&udev
->dev
, "unregistering device\n");
2111 usb_disable_device(udev
, 0);
2112 usb_hcd_synchronize_unlinks(udev
);
2115 port1
= udev
->portnum
;
2116 hub
= usb_hub_to_struct_hub(udev
->parent
);
2117 port_dev
= hub
->ports
[port1
- 1];
2119 sysfs_remove_link(&udev
->dev
.kobj
, "port");
2120 sysfs_remove_link(&port_dev
->dev
.kobj
, "device");
2123 * As usb_port_runtime_resume() de-references udev, make
2124 * sure no resumes occur during removal
2126 if (!test_and_set_bit(port1
, hub
->child_usage_bits
))
2127 pm_runtime_get_sync(&port_dev
->dev
);
2130 usb_remove_ep_devs(&udev
->ep0
);
2131 usb_unlock_device(udev
);
2133 /* Unregister the device. The device driver is responsible
2134 * for de-configuring the device and invoking the remove-device
2135 * notifier chain (used by usbfs and possibly others).
2137 device_del(&udev
->dev
);
2139 /* Free the device number and delete the parent's children[]
2140 * (or root_hub) pointer.
2142 release_devnum(udev
);
2144 /* Avoid races with recursively_mark_NOTATTACHED() */
2145 spin_lock_irq(&device_state_lock
);
2147 spin_unlock_irq(&device_state_lock
);
2149 if (port_dev
&& test_and_clear_bit(port1
, hub
->child_usage_bits
))
2150 pm_runtime_put(&port_dev
->dev
);
2154 put_device(&udev
->dev
);
2157 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
2158 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
2162 dev_info(&udev
->dev
, "%s: %s\n", id
, string
);
2165 static void announce_device(struct usb_device
*udev
)
2167 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
2168 le16_to_cpu(udev
->descriptor
.idVendor
),
2169 le16_to_cpu(udev
->descriptor
.idProduct
));
2170 dev_info(&udev
->dev
,
2171 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
2172 udev
->descriptor
.iManufacturer
,
2173 udev
->descriptor
.iProduct
,
2174 udev
->descriptor
.iSerialNumber
);
2175 show_string(udev
, "Product", udev
->product
);
2176 show_string(udev
, "Manufacturer", udev
->manufacturer
);
2177 show_string(udev
, "SerialNumber", udev
->serial
);
2180 static inline void announce_device(struct usb_device
*udev
) { }
2185 * usb_enumerate_device_otg - FIXME (usbcore-internal)
2186 * @udev: newly addressed device (in ADDRESS state)
2188 * Finish enumeration for On-The-Go devices
2190 * Return: 0 if successful. A negative error code otherwise.
2192 static int usb_enumerate_device_otg(struct usb_device
*udev
)
2196 #ifdef CONFIG_USB_OTG
2198 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
2199 * to wake us after we've powered off VBUS; and HNP, switching roles
2200 * "host" to "peripheral". The OTG descriptor helps figure this out.
2202 if (!udev
->bus
->is_b_host
2204 && udev
->parent
== udev
->bus
->root_hub
) {
2205 struct usb_otg_descriptor
*desc
= NULL
;
2206 struct usb_bus
*bus
= udev
->bus
;
2207 unsigned port1
= udev
->portnum
;
2209 /* descriptor may appear anywhere in config */
2210 err
= __usb_get_extra_descriptor(udev
->rawdescriptors
[0],
2211 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
2212 USB_DT_OTG
, (void **) &desc
);
2213 if (err
|| !(desc
->bmAttributes
& USB_OTG_HNP
))
2216 dev_info(&udev
->dev
, "Dual-Role OTG device on %sHNP port\n",
2217 (port1
== bus
->otg_port
) ? "" : "non-");
2219 /* enable HNP before suspend, it's simpler */
2220 if (port1
== bus
->otg_port
) {
2221 bus
->b_hnp_enable
= 1;
2222 err
= usb_control_msg(udev
,
2223 usb_sndctrlpipe(udev
, 0),
2224 USB_REQ_SET_FEATURE
, 0,
2225 USB_DEVICE_B_HNP_ENABLE
,
2227 USB_CTRL_SET_TIMEOUT
);
2230 * OTG MESSAGE: report errors here,
2231 * customize to match your product.
2233 dev_err(&udev
->dev
, "can't set HNP mode: %d\n",
2235 bus
->b_hnp_enable
= 0;
2237 } else if (desc
->bLength
== sizeof
2238 (struct usb_otg_descriptor
)) {
2239 /* Set a_alt_hnp_support for legacy otg device */
2240 err
= usb_control_msg(udev
,
2241 usb_sndctrlpipe(udev
, 0),
2242 USB_REQ_SET_FEATURE
, 0,
2243 USB_DEVICE_A_ALT_HNP_SUPPORT
,
2245 USB_CTRL_SET_TIMEOUT
);
2248 "set a_alt_hnp_support failed: %d\n",
2258 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
2259 * @udev: newly addressed device (in ADDRESS state)
2261 * This is only called by usb_new_device() and usb_authorize_device()
2262 * and FIXME -- all comments that apply to them apply here wrt to
2265 * If the device is WUSB and not authorized, we don't attempt to read
2266 * the string descriptors, as they will be errored out by the device
2267 * until it has been authorized.
2269 * Return: 0 if successful. A negative error code otherwise.
2271 static int usb_enumerate_device(struct usb_device
*udev
)
2274 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2276 if (udev
->config
== NULL
) {
2277 err
= usb_get_configuration(udev
);
2280 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
2286 /* read the standard strings and cache them if present */
2287 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
2288 udev
->manufacturer
= usb_cache_string(udev
,
2289 udev
->descriptor
.iManufacturer
);
2290 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
2292 err
= usb_enumerate_device_otg(udev
);
2296 if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST
) && hcd
->tpl_support
&&
2297 !is_targeted(udev
)) {
2298 /* Maybe it can talk to us, though we can't talk to it.
2299 * (Includes HNP test device.)
2301 if (IS_ENABLED(CONFIG_USB_OTG
) && (udev
->bus
->b_hnp_enable
2302 || udev
->bus
->is_b_host
)) {
2303 err
= usb_port_suspend(udev
, PMSG_AUTO_SUSPEND
);
2305 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
2309 #if defined(CONFIG_USB_OTG_WHITELIST_FOR_MDM)
2310 if (IS_ENABLED(CONFIG_USB_OTG_WHITELIST_FOR_MDM
) &&
2311 /*hcd->tpl_support &&*/
2312 !is_targeted_for_samsung_mdm(udev
)) {
2313 if (IS_ENABLED(CONFIG_USB_OTG
) && (udev
->bus
->b_hnp_enable
2314 || udev
->bus
->is_b_host
)) {
2315 err
= usb_port_suspend(udev
, PMSG_AUTO_SUSPEND
);
2317 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
2322 usb_detect_interface_quirks(udev
);
2327 static void set_usb_port_removable(struct usb_device
*udev
)
2329 struct usb_device
*hdev
= udev
->parent
;
2330 struct usb_hub
*hub
;
2331 u8 port
= udev
->portnum
;
2332 u16 wHubCharacteristics
;
2333 bool removable
= true;
2338 hub
= usb_hub_to_struct_hub(udev
->parent
);
2341 * If the platform firmware has provided information about a port,
2342 * use that to determine whether it's removable.
2344 switch (hub
->ports
[udev
->portnum
- 1]->connect_type
) {
2345 case USB_PORT_CONNECT_TYPE_HOT_PLUG
:
2346 udev
->removable
= USB_DEVICE_REMOVABLE
;
2348 case USB_PORT_CONNECT_TYPE_HARD_WIRED
:
2349 case USB_PORT_NOT_USED
:
2350 udev
->removable
= USB_DEVICE_FIXED
;
2357 * Otherwise, check whether the hub knows whether a port is removable
2360 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2362 if (!(wHubCharacteristics
& HUB_CHAR_COMPOUND
))
2365 if (hub_is_superspeed(hdev
)) {
2366 if (le16_to_cpu(hub
->descriptor
->u
.ss
.DeviceRemovable
)
2370 if (hub
->descriptor
->u
.hs
.DeviceRemovable
[port
/ 8] & (1 << (port
% 8)))
2375 udev
->removable
= USB_DEVICE_REMOVABLE
;
2377 udev
->removable
= USB_DEVICE_FIXED
;
2382 * usb_new_device - perform initial device setup (usbcore-internal)
2383 * @udev: newly addressed device (in ADDRESS state)
2385 * This is called with devices which have been detected but not fully
2386 * enumerated. The device descriptor is available, but not descriptors
2387 * for any device configuration. The caller must have locked either
2388 * the parent hub (if udev is a normal device) or else the
2389 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
2390 * udev has already been installed, but udev is not yet visible through
2391 * sysfs or other filesystem code.
2393 * This call is synchronous, and may not be used in an interrupt context.
2395 * Only the hub driver or root-hub registrar should ever call this.
2397 * Return: Whether the device is configured properly or not. Zero if the
2398 * interface was registered with the driver core; else a negative errno
2402 int usb_new_device(struct usb_device
*udev
)
2407 /* Initialize non-root-hub device wakeup to disabled;
2408 * device (un)configuration controls wakeup capable
2409 * sysfs power/wakeup controls wakeup enabled/disabled
2411 device_init_wakeup(&udev
->dev
, 0);
2414 /* Tell the runtime-PM framework the device is active */
2415 pm_runtime_set_active(&udev
->dev
);
2416 pm_runtime_get_noresume(&udev
->dev
);
2417 pm_runtime_use_autosuspend(&udev
->dev
);
2418 pm_runtime_enable(&udev
->dev
);
2420 /* By default, forbid autosuspend for all devices. It will be
2421 * allowed for hubs during binding.
2423 usb_disable_autosuspend(udev
);
2425 err
= usb_enumerate_device(udev
); /* Read descriptors */
2428 dev_dbg(&udev
->dev
, "udev %d, busnum %d, minor = %d\n",
2429 udev
->devnum
, udev
->bus
->busnum
,
2430 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
2431 /* export the usbdev device-node for libusb */
2432 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
2433 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
2435 /* Tell the world! */
2436 announce_device(udev
);
2439 add_device_randomness(udev
->serial
, strlen(udev
->serial
));
2441 add_device_randomness(udev
->product
, strlen(udev
->product
));
2442 if (udev
->manufacturer
)
2443 add_device_randomness(udev
->manufacturer
,
2444 strlen(udev
->manufacturer
));
2446 device_enable_async_suspend(&udev
->dev
);
2448 /* check whether the hub or firmware marks this port as non-removable */
2450 set_usb_port_removable(udev
);
2452 /* Register the device. The device driver is responsible
2453 * for configuring the device and invoking the add-device
2454 * notifier chain (used by usbfs and possibly others).
2456 err
= device_add(&udev
->dev
);
2458 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
2462 /* Create link files between child device and usb port device. */
2464 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
2465 int port1
= udev
->portnum
;
2466 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
2468 err
= sysfs_create_link(&udev
->dev
.kobj
,
2469 &port_dev
->dev
.kobj
, "port");
2473 err
= sysfs_create_link(&port_dev
->dev
.kobj
,
2474 &udev
->dev
.kobj
, "device");
2476 sysfs_remove_link(&udev
->dev
.kobj
, "port");
2480 if (!test_and_set_bit(port1
, hub
->child_usage_bits
))
2481 pm_runtime_get_sync(&port_dev
->dev
);
2484 (void) usb_create_ep_devs(&udev
->dev
, &udev
->ep0
, udev
);
2485 usb_mark_last_busy(udev
);
2486 pm_runtime_put_sync_autosuspend(&udev
->dev
);
2490 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
2491 pm_runtime_disable(&udev
->dev
);
2492 pm_runtime_set_suspended(&udev
->dev
);
2498 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
2499 * @usb_dev: USB device
2501 * Move the USB device to a very basic state where interfaces are disabled
2502 * and the device is in fact unconfigured and unusable.
2504 * We share a lock (that we have) with device_del(), so we need to
2509 int usb_deauthorize_device(struct usb_device
*usb_dev
)
2511 usb_lock_device(usb_dev
);
2512 if (usb_dev
->authorized
== 0)
2513 goto out_unauthorized
;
2515 usb_dev
->authorized
= 0;
2516 usb_set_configuration(usb_dev
, -1);
2519 usb_unlock_device(usb_dev
);
2524 int usb_authorize_device(struct usb_device
*usb_dev
)
2528 usb_lock_device(usb_dev
);
2529 if (usb_dev
->authorized
== 1)
2530 goto out_authorized
;
2532 result
= usb_autoresume_device(usb_dev
);
2534 dev_err(&usb_dev
->dev
,
2535 "can't autoresume for authorization: %d\n", result
);
2536 goto error_autoresume
;
2539 if (usb_dev
->wusb
) {
2540 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
2542 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
2543 "authorization: %d\n", result
);
2544 goto error_device_descriptor
;
2548 usb_dev
->authorized
= 1;
2549 /* Choose and set the configuration. This registers the interfaces
2550 * with the driver core and lets interface drivers bind to them.
2552 c
= usb_choose_configuration(usb_dev
);
2554 result
= usb_set_configuration(usb_dev
, c
);
2556 dev_err(&usb_dev
->dev
,
2557 "can't set config #%d, error %d\n", c
, result
);
2558 /* This need not be fatal. The user can try to
2559 * set other configurations. */
2562 dev_info(&usb_dev
->dev
, "authorized to connect\n");
2564 error_device_descriptor
:
2565 usb_autosuspend_device(usb_dev
);
2568 usb_unlock_device(usb_dev
); /* complements locktree */
2573 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2574 static unsigned hub_is_wusb(struct usb_hub
*hub
)
2576 struct usb_hcd
*hcd
;
2577 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
2579 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
2580 return hcd
->wireless
;
2584 #define PORT_RESET_TRIES 5
2585 #define SET_ADDRESS_TRIES 2
2586 #define GET_DESCRIPTOR_TRIES 2
2587 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2588 #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first)
2590 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
2591 #define HUB_SHORT_RESET_TIME 10
2592 #define HUB_BH_RESET_TIME 50
2593 #define HUB_LONG_RESET_TIME 200
2594 #define HUB_RESET_TIMEOUT 800
2597 * "New scheme" enumeration causes an extra state transition to be
2598 * exposed to an xhci host and causes USB3 devices to receive control
2599 * commands in the default state. This has been seen to cause
2600 * enumeration failures, so disable this enumeration scheme for USB3
2603 static bool use_new_scheme(struct usb_device
*udev
, int retry
)
2605 if (udev
->speed
>= USB_SPEED_SUPER
)
2608 return USE_NEW_SCHEME(retry
);
2611 /* Is a USB 3.0 port in the Inactive or Compliance Mode state?
2612 * Port worm reset is required to recover
2614 static bool hub_port_warm_reset_required(struct usb_hub
*hub
, int port1
,
2619 if (!hub_is_superspeed(hub
->hdev
))
2622 if (test_bit(port1
, hub
->warm_reset_bits
))
2625 link_state
= portstatus
& USB_PORT_STAT_LINK_STATE
;
2626 return link_state
== USB_SS_PORT_LS_SS_INACTIVE
2627 || link_state
== USB_SS_PORT_LS_COMP_MOD
;
2630 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
2631 struct usb_device
*udev
, unsigned int delay
, bool warm
)
2633 int delay_time
, ret
;
2637 for (delay_time
= 0;
2638 delay_time
< HUB_RESET_TIMEOUT
;
2639 delay_time
+= delay
) {
2640 /* wait to give the device a chance to reset */
2643 /* read and decode port status */
2644 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2649 * The port state is unknown until the reset completes.
2651 * On top of that, some chips may require additional time
2652 * to re-establish a connection after the reset is complete,
2653 * so also wait for the connection to be re-established.
2655 if (!(portstatus
& USB_PORT_STAT_RESET
) &&
2656 (portstatus
& USB_PORT_STAT_CONNECTION
))
2659 /* switch to the long delay after two short delay failures */
2660 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
2661 delay
= HUB_LONG_RESET_TIME
;
2663 dev_dbg(&hub
->ports
[port1
- 1]->dev
,
2664 "not %sreset yet, waiting %dms\n",
2665 warm
? "warm " : "", delay
);
2668 if ((portstatus
& USB_PORT_STAT_RESET
))
2671 if (hub_port_warm_reset_required(hub
, port1
, portstatus
))
2674 /* Device went away? */
2675 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
2678 /* Retry if connect change is set but status is still connected.
2679 * A USB 3.0 connection may bounce if multiple warm resets were issued,
2680 * but the device may have successfully re-connected. Ignore it.
2682 if (!hub_is_superspeed(hub
->hdev
) &&
2683 (portchange
& USB_PORT_STAT_C_CONNECTION
)) {
2684 usb_clear_port_feature(hub
->hdev
, port1
,
2685 USB_PORT_FEAT_C_CONNECTION
);
2689 if (!(portstatus
& USB_PORT_STAT_ENABLE
))
2695 if (hub_is_wusb(hub
))
2696 udev
->speed
= USB_SPEED_WIRELESS
;
2697 else if (hub_is_superspeed(hub
->hdev
))
2698 udev
->speed
= USB_SPEED_SUPER
;
2699 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
2700 udev
->speed
= USB_SPEED_HIGH
;
2701 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
2702 udev
->speed
= USB_SPEED_LOW
;
2704 udev
->speed
= USB_SPEED_FULL
;
2708 /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
2709 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
2710 struct usb_device
*udev
, unsigned int delay
, bool warm
)
2713 u16 portchange
, portstatus
;
2714 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
2716 if (!hub_is_superspeed(hub
->hdev
)) {
2718 dev_err(hub
->intfdev
, "only USB3 hub support "
2722 /* Block EHCI CF initialization during the port reset.
2723 * Some companion controllers don't like it when they mix.
2725 down_read(&ehci_cf_port_reset_rwsem
);
2728 * If the caller hasn't explicitly requested a warm reset,
2729 * double check and see if one is needed.
2731 if (hub_port_status(hub
, port1
, &portstatus
, &portchange
) == 0)
2732 if (hub_port_warm_reset_required(hub
, port1
,
2736 clear_bit(port1
, hub
->warm_reset_bits
);
2738 /* Reset the port */
2739 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
2740 status
= set_port_feature(hub
->hdev
, port1
, (warm
?
2741 USB_PORT_FEAT_BH_PORT_RESET
:
2742 USB_PORT_FEAT_RESET
));
2743 if (status
== -ENODEV
) {
2744 ; /* The hub is gone */
2745 } else if (status
) {
2746 dev_err(&port_dev
->dev
,
2747 "cannot %sreset (err = %d)\n",
2748 warm
? "warm " : "", status
);
2750 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
,
2752 if (status
&& status
!= -ENOTCONN
&& status
!= -ENODEV
)
2753 dev_dbg(hub
->intfdev
,
2754 "port_wait_reset: err = %d\n",
2758 /* Check for disconnect or reset */
2759 if (status
== 0 || status
== -ENOTCONN
|| status
== -ENODEV
) {
2760 usb_clear_port_feature(hub
->hdev
, port1
,
2761 USB_PORT_FEAT_C_RESET
);
2763 if (!hub_is_superspeed(hub
->hdev
))
2766 usb_clear_port_feature(hub
->hdev
, port1
,
2767 USB_PORT_FEAT_C_BH_PORT_RESET
);
2768 usb_clear_port_feature(hub
->hdev
, port1
,
2769 USB_PORT_FEAT_C_PORT_LINK_STATE
);
2770 usb_clear_port_feature(hub
->hdev
, port1
,
2771 USB_PORT_FEAT_C_CONNECTION
);
2774 * If a USB 3.0 device migrates from reset to an error
2775 * state, re-issue the warm reset.
2777 if (hub_port_status(hub
, port1
,
2778 &portstatus
, &portchange
) < 0)
2781 if (!hub_port_warm_reset_required(hub
, port1
,
2786 * If the port is in SS.Inactive or Compliance Mode, the
2787 * hot or warm reset failed. Try another warm reset.
2790 dev_dbg(&port_dev
->dev
,
2791 "hot reset failed, warm reset\n");
2796 dev_dbg(&port_dev
->dev
,
2797 "not enabled, trying %sreset again...\n",
2798 warm
? "warm " : "");
2799 delay
= HUB_LONG_RESET_TIME
;
2802 dev_err(&port_dev
->dev
, "Cannot enable. Maybe the USB cable is bad?\n");
2806 /* TRSTRCY = 10 ms; plus some extra */
2809 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2811 update_devnum(udev
, 0);
2812 /* The xHC may think the device is already reset,
2813 * so ignore the status.
2815 if (hcd
->driver
->reset_device
)
2816 hcd
->driver
->reset_device(hcd
, udev
);
2818 usb_set_device_state(udev
, USB_STATE_DEFAULT
);
2822 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
2825 if (!hub_is_superspeed(hub
->hdev
))
2826 up_read(&ehci_cf_port_reset_rwsem
);
2831 /* Check if a port is power on */
2832 static int port_is_power_on(struct usb_hub
*hub
, unsigned portstatus
)
2836 if (hub_is_superspeed(hub
->hdev
)) {
2837 if (portstatus
& USB_SS_PORT_STAT_POWER
)
2840 if (portstatus
& USB_PORT_STAT_POWER
)
2847 static void usb_lock_port(struct usb_port
*port_dev
)
2848 __acquires(&port_dev
->status_lock
)
2850 mutex_lock(&port_dev
->status_lock
);
2851 __acquire(&port_dev
->status_lock
);
2854 static void usb_unlock_port(struct usb_port
*port_dev
)
2855 __releases(&port_dev
->status_lock
)
2857 mutex_unlock(&port_dev
->status_lock
);
2858 __release(&port_dev
->status_lock
);
2863 /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
2864 static int port_is_suspended(struct usb_hub
*hub
, unsigned portstatus
)
2868 if (hub_is_superspeed(hub
->hdev
)) {
2869 if ((portstatus
& USB_PORT_STAT_LINK_STATE
)
2870 == USB_SS_PORT_LS_U3
)
2873 if (portstatus
& USB_PORT_STAT_SUSPEND
)
2880 /* Determine whether the device on a port is ready for a normal resume,
2881 * is ready for a reset-resume, or should be disconnected.
2883 static int check_port_resume_type(struct usb_device
*udev
,
2884 struct usb_hub
*hub
, int port1
,
2885 int status
, u16 portchange
, u16 portstatus
)
2887 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
2891 /* Is a warm reset needed to recover the connection? */
2892 if (status
== 0 && udev
->reset_resume
2893 && hub_port_warm_reset_required(hub
, port1
, portstatus
)) {
2896 /* Is the device still present? */
2897 else if (status
|| port_is_suspended(hub
, portstatus
) ||
2898 !port_is_power_on(hub
, portstatus
)) {
2901 } else if (!(portstatus
& USB_PORT_STAT_CONNECTION
)) {
2903 usleep_range(200, 300);
2904 status
= hub_port_status(hub
, port1
, &portstatus
,
2911 /* Can't do a normal resume if the port isn't enabled,
2912 * so try a reset-resume instead.
2914 else if (!(portstatus
& USB_PORT_STAT_ENABLE
) && !udev
->reset_resume
) {
2915 if (udev
->persist_enabled
)
2916 udev
->reset_resume
= 1;
2922 dev_dbg(&port_dev
->dev
, "status %04x.%04x after resume, %d\n",
2923 portchange
, portstatus
, status
);
2924 } else if (udev
->reset_resume
) {
2926 /* Late port handoff can set status-change bits */
2927 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
2928 usb_clear_port_feature(hub
->hdev
, port1
,
2929 USB_PORT_FEAT_C_CONNECTION
);
2930 if (portchange
& USB_PORT_STAT_C_ENABLE
)
2931 usb_clear_port_feature(hub
->hdev
, port1
,
2932 USB_PORT_FEAT_C_ENABLE
);
2938 int usb_disable_ltm(struct usb_device
*udev
)
2940 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2942 /* Check if the roothub and device supports LTM. */
2943 if (!usb_device_supports_ltm(hcd
->self
.root_hub
) ||
2944 !usb_device_supports_ltm(udev
))
2947 /* Clear Feature LTM Enable can only be sent if the device is
2950 if (!udev
->actconfig
)
2953 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2954 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
2955 USB_DEVICE_LTM_ENABLE
, 0, NULL
, 0,
2956 USB_CTRL_SET_TIMEOUT
);
2958 EXPORT_SYMBOL_GPL(usb_disable_ltm
);
2960 void usb_enable_ltm(struct usb_device
*udev
)
2962 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2964 /* Check if the roothub and device supports LTM. */
2965 if (!usb_device_supports_ltm(hcd
->self
.root_hub
) ||
2966 !usb_device_supports_ltm(udev
))
2969 /* Set Feature LTM Enable can only be sent if the device is
2972 if (!udev
->actconfig
)
2975 usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2976 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
2977 USB_DEVICE_LTM_ENABLE
, 0, NULL
, 0,
2978 USB_CTRL_SET_TIMEOUT
);
2980 EXPORT_SYMBOL_GPL(usb_enable_ltm
);
2983 * usb_enable_remote_wakeup - enable remote wakeup for a device
2984 * @udev: target device
2986 * For USB-2 devices: Set the device's remote wakeup feature.
2988 * For USB-3 devices: Assume there's only one function on the device and
2989 * enable remote wake for the first interface. FIXME if the interface
2990 * association descriptor shows there's more than one function.
2992 static int usb_enable_remote_wakeup(struct usb_device
*udev
)
2994 if (udev
->speed
< USB_SPEED_SUPER
)
2995 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
2996 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
2997 USB_DEVICE_REMOTE_WAKEUP
, 0, NULL
, 0,
2998 USB_CTRL_SET_TIMEOUT
);
3000 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3001 USB_REQ_SET_FEATURE
, USB_RECIP_INTERFACE
,
3002 USB_INTRF_FUNC_SUSPEND
,
3003 USB_INTRF_FUNC_SUSPEND_RW
|
3004 USB_INTRF_FUNC_SUSPEND_LP
,
3005 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3009 * usb_disable_remote_wakeup - disable remote wakeup for a device
3010 * @udev: target device
3012 * For USB-2 devices: Clear the device's remote wakeup feature.
3014 * For USB-3 devices: Assume there's only one function on the device and
3015 * disable remote wake for the first interface. FIXME if the interface
3016 * association descriptor shows there's more than one function.
3018 static int usb_disable_remote_wakeup(struct usb_device
*udev
)
3020 if (udev
->speed
< USB_SPEED_SUPER
)
3021 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3022 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
3023 USB_DEVICE_REMOTE_WAKEUP
, 0, NULL
, 0,
3024 USB_CTRL_SET_TIMEOUT
);
3026 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3027 USB_REQ_CLEAR_FEATURE
, USB_RECIP_INTERFACE
,
3028 USB_INTRF_FUNC_SUSPEND
, 0, NULL
, 0,
3029 USB_CTRL_SET_TIMEOUT
);
3032 /* Count of wakeup-enabled devices at or below udev */
3033 static unsigned wakeup_enabled_descendants(struct usb_device
*udev
)
3035 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
3037 return udev
->do_remote_wakeup
+
3038 (hub
? hub
->wakeup_enabled_descendants
: 0);
3042 * usb_port_suspend - suspend a usb device's upstream port
3043 * @udev: device that's no longer in active use, not a root hub
3044 * Context: must be able to sleep; device not locked; pm locks held
3046 * Suspends a USB device that isn't in active use, conserving power.
3047 * Devices may wake out of a suspend, if anything important happens,
3048 * using the remote wakeup mechanism. They may also be taken out of
3049 * suspend by the host, using usb_port_resume(). It's also routine
3050 * to disconnect devices while they are suspended.
3052 * This only affects the USB hardware for a device; its interfaces
3053 * (and, for hubs, child devices) must already have been suspended.
3055 * Selective port suspend reduces power; most suspended devices draw
3056 * less than 500 uA. It's also used in OTG, along with remote wakeup.
3057 * All devices below the suspended port are also suspended.
3059 * Devices leave suspend state when the host wakes them up. Some devices
3060 * also support "remote wakeup", where the device can activate the USB
3061 * tree above them to deliver data, such as a keypress or packet. In
3062 * some cases, this wakes the USB host.
3064 * Suspending OTG devices may trigger HNP, if that's been enabled
3065 * between a pair of dual-role devices. That will change roles, such
3066 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
3068 * Devices on USB hub ports have only one "suspend" state, corresponding
3069 * to ACPI D2, "may cause the device to lose some context".
3070 * State transitions include:
3072 * - suspend, resume ... when the VBUS power link stays live
3073 * - suspend, disconnect ... VBUS lost
3075 * Once VBUS drop breaks the circuit, the port it's using has to go through
3076 * normal re-enumeration procedures, starting with enabling VBUS power.
3077 * Other than re-initializing the hub (plug/unplug, except for root hubs),
3078 * Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq
3079 * timer, no SRP, no requests through sysfs.
3081 * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get
3082 * suspended until their bus goes into global suspend (i.e., the root
3083 * hub is suspended). Nevertheless, we change @udev->state to
3084 * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual
3085 * upstream port setting is stored in @udev->port_is_suspended.
3087 * Returns 0 on success, else negative errno.
3089 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
3091 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
3092 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
3093 int port1
= udev
->portnum
;
3095 bool really_suspend
= true;
3097 usb_lock_port(port_dev
);
3099 /* enable remote wakeup when appropriate; this lets the device
3100 * wake up the upstream hub (including maybe the root hub).
3102 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
3103 * we don't explicitly enable it here.
3105 if (udev
->do_remote_wakeup
) {
3106 status
= usb_enable_remote_wakeup(udev
);
3108 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
3110 /* bail if autosuspend is requested */
3111 if (PMSG_IS_AUTO(msg
))
3116 /* disable USB2 hardware LPM */
3117 if (udev
->usb2_hw_lpm_enabled
== 1)
3118 usb_set_usb2_hardware_lpm(udev
, 0);
3120 if (usb_disable_ltm(udev
)) {
3121 dev_err(&udev
->dev
, "Failed to disable LTM before suspend\n.");
3123 if (PMSG_IS_AUTO(msg
))
3126 if (usb_unlocked_disable_lpm(udev
)) {
3127 dev_err(&udev
->dev
, "Failed to disable LPM before suspend\n.");
3129 if (PMSG_IS_AUTO(msg
))
3134 if (hub_is_superspeed(hub
->hdev
))
3135 status
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_U3
);
3138 * For system suspend, we do not need to enable the suspend feature
3139 * on individual USB-2 ports. The devices will automatically go
3140 * into suspend a few ms after the root hub stops sending packets.
3141 * The USB 2.0 spec calls this "global suspend".
3143 * However, many USB hubs have a bug: They don't relay wakeup requests
3144 * from a downstream port if the port's suspend feature isn't on.
3145 * Therefore we will turn on the suspend feature if udev or any of its
3146 * descendants is enabled for remote wakeup.
3148 else if (PMSG_IS_AUTO(msg
) || wakeup_enabled_descendants(udev
) > 0)
3149 status
= set_port_feature(hub
->hdev
, port1
,
3150 USB_PORT_FEAT_SUSPEND
);
3152 really_suspend
= false;
3156 dev_dbg(&port_dev
->dev
, "can't suspend, status %d\n", status
);
3158 /* Try to enable USB3 LPM and LTM again */
3159 usb_unlocked_enable_lpm(udev
);
3161 usb_enable_ltm(udev
);
3163 /* Try to enable USB2 hardware LPM again */
3164 if (udev
->usb2_hw_lpm_capable
== 1)
3165 usb_set_usb2_hardware_lpm(udev
, 1);
3167 if (udev
->do_remote_wakeup
)
3168 (void) usb_disable_remote_wakeup(udev
);
3171 /* System sleep transitions should never fail */
3172 if (!PMSG_IS_AUTO(msg
))
3175 dev_dbg(&udev
->dev
, "usb %ssuspend, wakeup %d\n",
3176 (PMSG_IS_AUTO(msg
) ? "auto-" : ""),
3177 udev
->do_remote_wakeup
);
3178 if (really_suspend
) {
3179 udev
->port_is_suspended
= 1;
3181 /* device has up to 10 msec to fully suspend */
3184 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
3187 if (status
== 0 && !udev
->do_remote_wakeup
&& udev
->persist_enabled
3188 && test_and_clear_bit(port1
, hub
->child_usage_bits
))
3189 pm_runtime_put_sync(&port_dev
->dev
);
3191 usb_mark_last_busy(hub
->hdev
);
3193 usb_unlock_port(port_dev
);
3198 * If the USB "suspend" state is in use (rather than "global suspend"),
3199 * many devices will be individually taken out of suspend state using
3200 * special "resume" signaling. This routine kicks in shortly after
3201 * hardware resume signaling is finished, either because of selective
3202 * resume (by host) or remote wakeup (by device) ... now see what changed
3203 * in the tree that's rooted at this device.
3205 * If @udev->reset_resume is set then the device is reset before the
3206 * status check is done.
3208 static int finish_port_resume(struct usb_device
*udev
)
3213 /* caller owns the udev device lock */
3214 dev_dbg(&udev
->dev
, "%s\n",
3215 udev
->reset_resume
? "finish reset-resume" : "finish resume");
3217 /* usb ch9 identifies four variants of SUSPENDED, based on what
3218 * state the device resumes to. Linux currently won't see the
3219 * first two on the host side; they'd be inside hub_port_init()
3220 * during many timeouts, but hub_wq can't suspend until later.
3222 usb_set_device_state(udev
, udev
->actconfig
3223 ? USB_STATE_CONFIGURED
3224 : USB_STATE_ADDRESS
);
3226 /* 10.5.4.5 says not to reset a suspended port if the attached
3227 * device is enabled for remote wakeup. Hence the reset
3228 * operation is carried out here, after the port has been
3231 if (udev
->reset_resume
) {
3233 * If the device morphs or switches modes when it is reset,
3234 * we don't want to perform a reset-resume. We'll fail the
3235 * resume, which will cause a logical disconnect, and then
3236 * the device will be rediscovered.
3239 if (udev
->quirks
& USB_QUIRK_RESET
)
3242 status
= usb_reset_and_verify_device(udev
);
3245 /* 10.5.4.5 says be sure devices in the tree are still there.
3246 * For now let's assume the device didn't go crazy on resume,
3247 * and device drivers will know about any resume quirks.
3251 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
3253 /* If a normal resume failed, try doing a reset-resume */
3254 if (status
&& !udev
->reset_resume
&& udev
->persist_enabled
) {
3255 dev_dbg(&udev
->dev
, "retry with reset-resume\n");
3256 udev
->reset_resume
= 1;
3257 goto retry_reset_resume
;
3262 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
3265 * There are a few quirky devices which violate the standard
3266 * by claiming to have remote wakeup enabled after a reset,
3267 * which crash if the feature is cleared, hence check for
3268 * udev->reset_resume
3270 } else if (udev
->actconfig
&& !udev
->reset_resume
) {
3271 if (udev
->speed
< USB_SPEED_SUPER
) {
3272 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
3273 status
= usb_disable_remote_wakeup(udev
);
3275 status
= usb_get_status(udev
, USB_RECIP_INTERFACE
, 0,
3277 if (!status
&& devstatus
& (USB_INTRF_STAT_FUNC_RW_CAP
3278 | USB_INTRF_STAT_FUNC_RW
))
3279 status
= usb_disable_remote_wakeup(udev
);
3284 "disable remote wakeup, status %d\n",
3292 * There are some SS USB devices which take longer time for link training.
3293 * XHCI specs 4.19.4 says that when Link training is successful, port
3294 * sets CSC bit to 1. So if SW reads port status before successful link
3295 * training, then it will not find device to be present.
3296 * USB Analyzer log with such buggy devices show that in some cases
3297 * device switch on the RX termination after long delay of host enabling
3298 * the VBUS. In few other cases it has been seen that device fails to
3299 * negotiate link training in first attempt. It has been
3300 * reported till now that few devices take as long as 2000 ms to train
3301 * the link after host enabling its VBUS and termination. Following
3302 * routine implements a 2000 ms timeout for link training. If in a case
3303 * link trains before timeout, loop will exit earlier.
3305 * FIXME: If a device was connected before suspend, but was removed
3306 * while system was asleep, then the loop in the following routine will
3307 * only exit at timeout.
3309 * This routine should only be called when persist is enabled for a SS
3312 static int wait_for_ss_port_enable(struct usb_device
*udev
,
3313 struct usb_hub
*hub
, int *port1
,
3314 u16
*portchange
, u16
*portstatus
)
3316 int status
= 0, delay_ms
= 0;
3318 while (delay_ms
< 2000) {
3319 if (status
|| *portstatus
& USB_PORT_STAT_CONNECTION
)
3323 status
= hub_port_status(hub
, *port1
, portstatus
, portchange
);
3329 * usb_port_resume - re-activate a suspended usb device's upstream port
3330 * @udev: device to re-activate, not a root hub
3331 * Context: must be able to sleep; device not locked; pm locks held
3333 * This will re-activate the suspended device, increasing power usage
3334 * while letting drivers communicate again with its endpoints.
3335 * USB resume explicitly guarantees that the power session between
3336 * the host and the device is the same as it was when the device
3339 * If @udev->reset_resume is set then this routine won't check that the
3340 * port is still enabled. Furthermore, finish_port_resume() above will
3341 * reset @udev. The end result is that a broken power session can be
3342 * recovered and @udev will appear to persist across a loss of VBUS power.
3344 * For example, if a host controller doesn't maintain VBUS suspend current
3345 * during a system sleep or is reset when the system wakes up, all the USB
3346 * power sessions below it will be broken. This is especially troublesome
3347 * for mass-storage devices containing mounted filesystems, since the
3348 * device will appear to have disconnected and all the memory mappings
3349 * to it will be lost. Using the USB_PERSIST facility, the device can be
3350 * made to appear as if it had not disconnected.
3352 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
3353 * every effort to insure that the same device is present after the
3354 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
3355 * quite possible for a device to remain unaltered but its media to be
3356 * changed. If the user replaces a flash memory card while the system is
3357 * asleep, he will have only himself to blame when the filesystem on the
3358 * new card is corrupted and the system crashes.
3360 * Returns 0 on success, else negative errno.
3362 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
3364 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
3365 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
3366 int port1
= udev
->portnum
;
3368 u16 portchange
, portstatus
;
3370 if (!test_and_set_bit(port1
, hub
->child_usage_bits
)) {
3371 status
= pm_runtime_get_sync(&port_dev
->dev
);
3373 dev_dbg(&udev
->dev
, "can't resume usb port, status %d\n",
3379 usb_lock_port(port_dev
);
3381 /* Skip the initial Clear-Suspend step for a remote wakeup */
3382 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3383 if (status
== 0 && !port_is_suspended(hub
, portstatus
))
3384 goto SuspendCleared
;
3386 /* see 7.1.7.7; affects power usage, but not budgeting */
3387 if (hub_is_superspeed(hub
->hdev
))
3388 status
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_U0
);
3390 status
= usb_clear_port_feature(hub
->hdev
,
3391 port1
, USB_PORT_FEAT_SUSPEND
);
3393 dev_dbg(&port_dev
->dev
, "can't resume, status %d\n", status
);
3395 /* drive resume for USB_RESUME_TIMEOUT msec */
3396 dev_dbg(&udev
->dev
, "usb %sresume\n",
3397 (PMSG_IS_AUTO(msg
) ? "auto-" : ""));
3398 msleep(USB_RESUME_TIMEOUT
);
3400 /* Virtual root hubs can trigger on GET_PORT_STATUS to
3401 * stop resume signaling. Then finish the resume
3404 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3406 /* TRSMRCY = 10 msec */
3412 udev
->port_is_suspended
= 0;
3413 if (hub_is_superspeed(hub
->hdev
)) {
3414 if (portchange
& USB_PORT_STAT_C_LINK_STATE
)
3415 usb_clear_port_feature(hub
->hdev
, port1
,
3416 USB_PORT_FEAT_C_PORT_LINK_STATE
);
3418 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
3419 usb_clear_port_feature(hub
->hdev
, port1
,
3420 USB_PORT_FEAT_C_SUSPEND
);
3424 if (udev
->persist_enabled
&& hub_is_superspeed(hub
->hdev
))
3425 status
= wait_for_ss_port_enable(udev
, hub
, &port1
, &portchange
,
3428 status
= check_port_resume_type(udev
,
3429 hub
, port1
, status
, portchange
, portstatus
);
3431 status
= finish_port_resume(udev
);
3433 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
3434 hub_port_logical_disconnect(hub
, port1
);
3436 /* Try to enable USB2 hardware LPM */
3437 if (udev
->usb2_hw_lpm_capable
== 1)
3438 usb_set_usb2_hardware_lpm(udev
, 1);
3440 /* Try to enable USB3 LTM and LPM */
3441 usb_enable_ltm(udev
);
3442 usb_unlocked_enable_lpm(udev
);
3445 usb_unlock_port(port_dev
);
3450 int usb_remote_wakeup(struct usb_device
*udev
)
3454 usb_lock_device(udev
);
3455 if (udev
->state
== USB_STATE_SUSPENDED
) {
3456 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
3457 status
= usb_autoresume_device(udev
);
3459 /* Let the drivers do their thing, then... */
3460 usb_autosuspend_device(udev
);
3463 usb_unlock_device(udev
);
3467 /* Returns 1 if there was a remote wakeup and a connect status change. */
3468 static int hub_handle_remote_wakeup(struct usb_hub
*hub
, unsigned int port
,
3469 u16 portstatus
, u16 portchange
)
3470 __must_hold(&port_dev
->status_lock
)
3472 struct usb_port
*port_dev
= hub
->ports
[port
- 1];
3473 struct usb_device
*hdev
;
3474 struct usb_device
*udev
;
3475 int connect_change
= 0;
3479 udev
= port_dev
->child
;
3480 if (!hub_is_superspeed(hdev
)) {
3481 if (!(portchange
& USB_PORT_STAT_C_SUSPEND
))
3483 usb_clear_port_feature(hdev
, port
, USB_PORT_FEAT_C_SUSPEND
);
3485 if (!udev
|| udev
->state
!= USB_STATE_SUSPENDED
||
3486 (portstatus
& USB_PORT_STAT_LINK_STATE
) !=
3492 /* TRSMRCY = 10 msec */
3495 usb_unlock_port(port_dev
);
3496 ret
= usb_remote_wakeup(udev
);
3497 usb_lock_port(port_dev
);
3502 hub_port_disable(hub
, port
, 1);
3504 dev_dbg(&port_dev
->dev
, "resume, status %d\n", ret
);
3505 return connect_change
;
3508 static int check_ports_changed(struct usb_hub
*hub
)
3512 for (port1
= 1; port1
<= hub
->hdev
->maxchild
; ++port1
) {
3513 u16 portstatus
, portchange
;
3516 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3517 if (!status
&& portchange
)
3523 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
3525 struct usb_hub
*hub
= usb_get_intfdata(intf
);
3526 struct usb_device
*hdev
= hub
->hdev
;
3531 * Warn if children aren't already suspended.
3532 * Also, add up the number of wakeup-enabled descendants.
3534 hub
->wakeup_enabled_descendants
= 0;
3535 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
3536 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
3537 struct usb_device
*udev
= port_dev
->child
;
3539 if (udev
&& udev
->can_submit
) {
3540 dev_warn(&port_dev
->dev
, "device %s not suspended yet\n",
3541 dev_name(&udev
->dev
));
3542 if (PMSG_IS_AUTO(msg
))
3546 hub
->wakeup_enabled_descendants
+=
3547 wakeup_enabled_descendants(udev
);
3550 if (hdev
->do_remote_wakeup
&& hub
->quirk_check_port_auto_suspend
) {
3551 /* check if there are changes pending on hub ports */
3552 if (check_ports_changed(hub
)) {
3553 if (PMSG_IS_AUTO(msg
))
3555 pm_wakeup_event(&hdev
->dev
, 2000);
3559 if (hub_is_superspeed(hdev
) && hdev
->do_remote_wakeup
) {
3560 /* Enable hub to send remote wakeup for all ports. */
3561 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
3562 status
= set_port_feature(hdev
,
3564 USB_PORT_FEAT_REMOTE_WAKE_CONNECT
|
3565 USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT
|
3566 USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT
,
3567 USB_PORT_FEAT_REMOTE_WAKE_MASK
);
3571 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3573 /* stop hub_wq and related activity */
3574 hub_quiesce(hub
, HUB_SUSPEND
);
3578 static int hub_resume(struct usb_interface
*intf
)
3580 struct usb_hub
*hub
= usb_get_intfdata(intf
);
3582 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3583 hub_activate(hub
, HUB_RESUME
);
3587 static int hub_reset_resume(struct usb_interface
*intf
)
3589 struct usb_hub
*hub
= usb_get_intfdata(intf
);
3591 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3592 hub_activate(hub
, HUB_RESET_RESUME
);
3597 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
3598 * @rhdev: struct usb_device for the root hub
3600 * The USB host controller driver calls this function when its root hub
3601 * is resumed and Vbus power has been interrupted or the controller
3602 * has been reset. The routine marks @rhdev as having lost power.
3603 * When the hub driver is resumed it will take notice and carry out
3604 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
3605 * the others will be disconnected.
3607 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
3609 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
3610 rhdev
->reset_resume
= 1;
3612 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
3614 static const char * const usb3_lpm_names
[] = {
3622 * Send a Set SEL control transfer to the device, prior to enabling
3623 * device-initiated U1 or U2. This lets the device know the exit latencies from
3624 * the time the device initiates a U1 or U2 exit, to the time it will receive a
3625 * packet from the host.
3627 * This function will fail if the SEL or PEL values for udev are greater than
3628 * the maximum allowed values for the link state to be enabled.
3630 static int usb_req_set_sel(struct usb_device
*udev
, enum usb3_link_state state
)
3632 struct usb_set_sel_req
*sel_values
;
3633 unsigned long long u1_sel
;
3634 unsigned long long u1_pel
;
3635 unsigned long long u2_sel
;
3636 unsigned long long u2_pel
;
3639 if (udev
->state
!= USB_STATE_CONFIGURED
)
3642 /* Convert SEL and PEL stored in ns to us */
3643 u1_sel
= DIV_ROUND_UP(udev
->u1_params
.sel
, 1000);
3644 u1_pel
= DIV_ROUND_UP(udev
->u1_params
.pel
, 1000);
3645 u2_sel
= DIV_ROUND_UP(udev
->u2_params
.sel
, 1000);
3646 u2_pel
= DIV_ROUND_UP(udev
->u2_params
.pel
, 1000);
3649 * Make sure that the calculated SEL and PEL values for the link
3650 * state we're enabling aren't bigger than the max SEL/PEL
3651 * value that will fit in the SET SEL control transfer.
3652 * Otherwise the device would get an incorrect idea of the exit
3653 * latency for the link state, and could start a device-initiated
3654 * U1/U2 when the exit latencies are too high.
3656 if ((state
== USB3_LPM_U1
&&
3657 (u1_sel
> USB3_LPM_MAX_U1_SEL_PEL
||
3658 u1_pel
> USB3_LPM_MAX_U1_SEL_PEL
)) ||
3659 (state
== USB3_LPM_U2
&&
3660 (u2_sel
> USB3_LPM_MAX_U2_SEL_PEL
||
3661 u2_pel
> USB3_LPM_MAX_U2_SEL_PEL
))) {
3662 dev_dbg(&udev
->dev
, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n",
3663 usb3_lpm_names
[state
], u1_sel
, u1_pel
);
3668 * If we're enabling device-initiated LPM for one link state,
3669 * but the other link state has a too high SEL or PEL value,
3670 * just set those values to the max in the Set SEL request.
3672 if (u1_sel
> USB3_LPM_MAX_U1_SEL_PEL
)
3673 u1_sel
= USB3_LPM_MAX_U1_SEL_PEL
;
3675 if (u1_pel
> USB3_LPM_MAX_U1_SEL_PEL
)
3676 u1_pel
= USB3_LPM_MAX_U1_SEL_PEL
;
3678 if (u2_sel
> USB3_LPM_MAX_U2_SEL_PEL
)
3679 u2_sel
= USB3_LPM_MAX_U2_SEL_PEL
;
3681 if (u2_pel
> USB3_LPM_MAX_U2_SEL_PEL
)
3682 u2_pel
= USB3_LPM_MAX_U2_SEL_PEL
;
3685 * usb_enable_lpm() can be called as part of a failed device reset,
3686 * which may be initiated by an error path of a mass storage driver.
3687 * Therefore, use GFP_NOIO.
3689 sel_values
= kmalloc(sizeof *(sel_values
), GFP_NOIO
);
3693 sel_values
->u1_sel
= u1_sel
;
3694 sel_values
->u1_pel
= u1_pel
;
3695 sel_values
->u2_sel
= cpu_to_le16(u2_sel
);
3696 sel_values
->u2_pel
= cpu_to_le16(u2_pel
);
3698 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3702 sel_values
, sizeof *(sel_values
),
3703 USB_CTRL_SET_TIMEOUT
);
3709 * Enable or disable device-initiated U1 or U2 transitions.
3711 static int usb_set_device_initiated_lpm(struct usb_device
*udev
,
3712 enum usb3_link_state state
, bool enable
)
3719 feature
= USB_DEVICE_U1_ENABLE
;
3722 feature
= USB_DEVICE_U2_ENABLE
;
3725 dev_warn(&udev
->dev
, "%s: Can't %s non-U1 or U2 state.\n",
3726 __func__
, enable
? "enable" : "disable");
3730 if (udev
->state
!= USB_STATE_CONFIGURED
) {
3731 dev_dbg(&udev
->dev
, "%s: Can't %s %s state "
3732 "for unconfigured device.\n",
3733 __func__
, enable
? "enable" : "disable",
3734 usb3_lpm_names
[state
]);
3740 * Now send the control transfer to enable device-initiated LPM
3741 * for either U1 or U2.
3743 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3744 USB_REQ_SET_FEATURE
,
3748 USB_CTRL_SET_TIMEOUT
);
3750 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3751 USB_REQ_CLEAR_FEATURE
,
3755 USB_CTRL_SET_TIMEOUT
);
3758 dev_warn(&udev
->dev
, "%s of device-initiated %s failed.\n",
3759 enable
? "Enable" : "Disable",
3760 usb3_lpm_names
[state
]);
3766 static int usb_set_lpm_timeout(struct usb_device
*udev
,
3767 enum usb3_link_state state
, int timeout
)
3774 feature
= USB_PORT_FEAT_U1_TIMEOUT
;
3777 feature
= USB_PORT_FEAT_U2_TIMEOUT
;
3780 dev_warn(&udev
->dev
, "%s: Can't set timeout for non-U1 or U2 state.\n",
3785 if (state
== USB3_LPM_U1
&& timeout
> USB3_LPM_U1_MAX_TIMEOUT
&&
3786 timeout
!= USB3_LPM_DEVICE_INITIATED
) {
3787 dev_warn(&udev
->dev
, "Failed to set %s timeout to 0x%x, "
3788 "which is a reserved value.\n",
3789 usb3_lpm_names
[state
], timeout
);
3793 ret
= set_port_feature(udev
->parent
,
3794 USB_PORT_LPM_TIMEOUT(timeout
) | udev
->portnum
,
3797 dev_warn(&udev
->dev
, "Failed to set %s timeout to 0x%x,"
3798 "error code %i\n", usb3_lpm_names
[state
],
3802 if (state
== USB3_LPM_U1
)
3803 udev
->u1_params
.timeout
= timeout
;
3805 udev
->u2_params
.timeout
= timeout
;
3810 * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
3813 * We will attempt to enable U1 or U2, but there are no guarantees that the
3814 * control transfers to set the hub timeout or enable device-initiated U1/U2
3815 * will be successful.
3817 * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
3818 * driver know about it. If that call fails, it should be harmless, and just
3819 * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
3821 static void usb_enable_link_state(struct usb_hcd
*hcd
, struct usb_device
*udev
,
3822 enum usb3_link_state state
)
3825 __u8 u1_mel
= udev
->bos
->ss_cap
->bU1devExitLat
;
3826 __le16 u2_mel
= udev
->bos
->ss_cap
->bU2DevExitLat
;
3828 /* If the device says it doesn't have *any* exit latency to come out of
3829 * U1 or U2, it's probably lying. Assume it doesn't implement that link
3832 if ((state
== USB3_LPM_U1
&& u1_mel
== 0) ||
3833 (state
== USB3_LPM_U2
&& u2_mel
== 0))
3837 * First, let the device know about the exit latencies
3838 * associated with the link state we're about to enable.
3840 ret
= usb_req_set_sel(udev
, state
);
3842 dev_warn(&udev
->dev
, "Set SEL for device-initiated %s failed.\n",
3843 usb3_lpm_names
[state
]);
3847 /* We allow the host controller to set the U1/U2 timeout internally
3848 * first, so that it can change its schedule to account for the
3849 * additional latency to send data to a device in a lower power
3852 timeout
= hcd
->driver
->enable_usb3_lpm_timeout(hcd
, udev
, state
);
3854 /* xHCI host controller doesn't want to enable this LPM state. */
3859 dev_warn(&udev
->dev
, "Could not enable %s link state, "
3860 "xHCI error %i.\n", usb3_lpm_names
[state
],
3865 if (usb_set_lpm_timeout(udev
, state
, timeout
)) {
3866 /* If we can't set the parent hub U1/U2 timeout,
3867 * device-initiated LPM won't be allowed either, so let the xHCI
3868 * host know that this link state won't be enabled.
3870 hcd
->driver
->disable_usb3_lpm_timeout(hcd
, udev
, state
);
3872 /* Only a configured device will accept the Set Feature
3875 if (udev
->actconfig
)
3876 usb_set_device_initiated_lpm(udev
, state
, true);
3878 /* As soon as usb_set_lpm_timeout(timeout) returns 0, the
3879 * hub-initiated LPM is enabled. Thus, LPM is enabled no
3880 * matter the result of usb_set_device_initiated_lpm().
3881 * The only difference is whether device is able to initiate
3884 if (state
== USB3_LPM_U1
)
3885 udev
->usb3_lpm_u1_enabled
= 1;
3886 else if (state
== USB3_LPM_U2
)
3887 udev
->usb3_lpm_u2_enabled
= 1;
3892 * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
3895 * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
3896 * If zero is returned, the parent will not allow the link to go into U1/U2.
3898 * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
3899 * it won't have an effect on the bus link state because the parent hub will
3900 * still disallow device-initiated U1/U2 entry.
3902 * If zero is returned, the xHCI host controller may still think U1/U2 entry is
3903 * possible. The result will be slightly more bus bandwidth will be taken up
3904 * (to account for U1/U2 exit latency), but it should be harmless.
3906 static int usb_disable_link_state(struct usb_hcd
*hcd
, struct usb_device
*udev
,
3907 enum usb3_link_state state
)
3914 dev_warn(&udev
->dev
, "%s: Can't disable non-U1 or U2 state.\n",
3919 if (usb_set_lpm_timeout(udev
, state
, 0))
3922 usb_set_device_initiated_lpm(udev
, state
, false);
3924 if (hcd
->driver
->disable_usb3_lpm_timeout(hcd
, udev
, state
))
3925 dev_warn(&udev
->dev
, "Could not disable xHCI %s timeout, "
3926 "bus schedule bandwidth may be impacted.\n",
3927 usb3_lpm_names
[state
]);
3929 /* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM
3930 * is disabled. Hub will disallows link to enter U1/U2 as well,
3931 * even device is initiating LPM. Hence LPM is disabled if hub LPM
3932 * timeout set to 0, no matter device-initiated LPM is disabled or
3935 if (state
== USB3_LPM_U1
)
3936 udev
->usb3_lpm_u1_enabled
= 0;
3937 else if (state
== USB3_LPM_U2
)
3938 udev
->usb3_lpm_u2_enabled
= 0;
3944 * Disable hub-initiated and device-initiated U1 and U2 entry.
3945 * Caller must own the bandwidth_mutex.
3947 * This will call usb_enable_lpm() on failure, which will decrement
3948 * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
3950 int usb_disable_lpm(struct usb_device
*udev
)
3952 struct usb_hcd
*hcd
;
3954 if (!udev
|| !udev
->parent
||
3955 udev
->speed
< USB_SPEED_SUPER
||
3956 !udev
->lpm_capable
||
3957 udev
->state
< USB_STATE_DEFAULT
)
3960 hcd
= bus_to_hcd(udev
->bus
);
3961 if (!hcd
|| !hcd
->driver
->disable_usb3_lpm_timeout
)
3964 udev
->lpm_disable_count
++;
3965 if ((udev
->u1_params
.timeout
== 0 && udev
->u2_params
.timeout
== 0))
3968 /* If LPM is enabled, attempt to disable it. */
3969 if (usb_disable_link_state(hcd
, udev
, USB3_LPM_U1
))
3971 if (usb_disable_link_state(hcd
, udev
, USB3_LPM_U2
))
3977 usb_enable_lpm(udev
);
3980 EXPORT_SYMBOL_GPL(usb_disable_lpm
);
3982 /* Grab the bandwidth_mutex before calling usb_disable_lpm() */
3983 int usb_unlocked_disable_lpm(struct usb_device
*udev
)
3985 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3991 mutex_lock(hcd
->bandwidth_mutex
);
3992 ret
= usb_disable_lpm(udev
);
3993 mutex_unlock(hcd
->bandwidth_mutex
);
3997 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm
);
4000 * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
4001 * xHCI host policy may prevent U1 or U2 from being enabled.
4003 * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
4004 * until the lpm_disable_count drops to zero. Caller must own the
4007 void usb_enable_lpm(struct usb_device
*udev
)
4009 struct usb_hcd
*hcd
;
4011 if (!udev
|| !udev
->parent
||
4012 udev
->speed
< USB_SPEED_SUPER
||
4013 !udev
->lpm_capable
||
4014 udev
->state
< USB_STATE_DEFAULT
)
4017 udev
->lpm_disable_count
--;
4018 hcd
= bus_to_hcd(udev
->bus
);
4019 /* Double check that we can both enable and disable LPM.
4020 * Device must be configured to accept set feature U1/U2 timeout.
4022 if (!hcd
|| !hcd
->driver
->enable_usb3_lpm_timeout
||
4023 !hcd
->driver
->disable_usb3_lpm_timeout
)
4026 if (udev
->lpm_disable_count
> 0)
4029 usb_enable_link_state(hcd
, udev
, USB3_LPM_U1
);
4030 usb_enable_link_state(hcd
, udev
, USB3_LPM_U2
);
4032 EXPORT_SYMBOL_GPL(usb_enable_lpm
);
4034 /* Grab the bandwidth_mutex before calling usb_enable_lpm() */
4035 void usb_unlocked_enable_lpm(struct usb_device
*udev
)
4037 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
4042 mutex_lock(hcd
->bandwidth_mutex
);
4043 usb_enable_lpm(udev
);
4044 mutex_unlock(hcd
->bandwidth_mutex
);
4046 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm
);
4048 /* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */
4049 static void hub_usb3_port_prepare_disable(struct usb_hub
*hub
,
4050 struct usb_port
*port_dev
)
4052 struct usb_device
*udev
= port_dev
->child
;
4055 if (udev
&& udev
->port_is_suspended
&& udev
->do_remote_wakeup
) {
4056 ret
= hub_set_port_link_state(hub
, port_dev
->portnum
,
4059 msleep(USB_RESUME_TIMEOUT
);
4060 ret
= usb_disable_remote_wakeup(udev
);
4063 dev_warn(&udev
->dev
,
4064 "Port disable: can't disable remote wake\n");
4065 udev
->do_remote_wakeup
= 0;
4069 #else /* CONFIG_PM */
4071 #define hub_suspend NULL
4072 #define hub_resume NULL
4073 #define hub_reset_resume NULL
4075 static inline void hub_usb3_port_prepare_disable(struct usb_hub
*hub
,
4076 struct usb_port
*port_dev
) { }
4078 int usb_disable_lpm(struct usb_device
*udev
)
4082 EXPORT_SYMBOL_GPL(usb_disable_lpm
);
4084 void usb_enable_lpm(struct usb_device
*udev
) { }
4085 EXPORT_SYMBOL_GPL(usb_enable_lpm
);
4087 int usb_unlocked_disable_lpm(struct usb_device
*udev
)
4091 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm
);
4093 void usb_unlocked_enable_lpm(struct usb_device
*udev
) { }
4094 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm
);
4096 int usb_disable_ltm(struct usb_device
*udev
)
4100 EXPORT_SYMBOL_GPL(usb_disable_ltm
);
4102 void usb_enable_ltm(struct usb_device
*udev
) { }
4103 EXPORT_SYMBOL_GPL(usb_enable_ltm
);
4105 static int hub_handle_remote_wakeup(struct usb_hub
*hub
, unsigned int port
,
4106 u16 portstatus
, u16 portchange
)
4111 #endif /* CONFIG_PM */
4114 * USB-3 does not have a similar link state as USB-2 that will avoid negotiating
4115 * a connection with a plugged-in cable but will signal the host when the cable
4116 * is unplugged. Disable remote wake and set link state to U3 for USB-3 devices
4118 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
4120 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
4121 struct usb_device
*hdev
= hub
->hdev
;
4125 if (hub_is_superspeed(hub
->hdev
)) {
4126 hub_usb3_port_prepare_disable(hub
, port_dev
);
4127 ret
= hub_set_port_link_state(hub
, port_dev
->portnum
,
4130 ret
= usb_clear_port_feature(hdev
, port1
,
4131 USB_PORT_FEAT_ENABLE
);
4134 if (port_dev
->child
&& set_state
)
4135 usb_set_device_state(port_dev
->child
, USB_STATE_NOTATTACHED
);
4136 if (ret
&& ret
!= -ENODEV
)
4137 dev_err(&port_dev
->dev
, "cannot disable (err = %d)\n", ret
);
4142 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
4144 * Between connect detection and reset signaling there must be a delay
4145 * of 100ms at least for debounce and power-settling. The corresponding
4146 * timer shall restart whenever the downstream port detects a disconnect.
4148 * Apparently there are some bluetooth and irda-dongles and a number of
4149 * low-speed devices for which this debounce period may last over a second.
4150 * Not covered by the spec - but easy to deal with.
4152 * This implementation uses a 1500ms total debounce timeout; if the
4153 * connection isn't stable by then it returns -ETIMEDOUT. It checks
4154 * every 25ms for transient disconnects. When the port status has been
4155 * unchanged for 100ms it returns the port status.
4157 int hub_port_debounce(struct usb_hub
*hub
, int port1
, bool must_be_connected
)
4160 u16 portchange
, portstatus
;
4161 unsigned connection
= 0xffff;
4162 int total_time
, stable_time
= 0;
4163 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
4165 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
4166 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
4170 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
4171 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
4172 if (!must_be_connected
||
4173 (connection
== USB_PORT_STAT_CONNECTION
))
4174 stable_time
+= HUB_DEBOUNCE_STEP
;
4175 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
4179 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
4182 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
4183 usb_clear_port_feature(hub
->hdev
, port1
,
4184 USB_PORT_FEAT_C_CONNECTION
);
4187 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
4189 msleep(HUB_DEBOUNCE_STEP
);
4192 dev_dbg(&port_dev
->dev
, "debounce total %dms stable %dms status 0x%x\n",
4193 total_time
, stable_time
, portstatus
);
4195 if (stable_time
< HUB_DEBOUNCE_STABLE
)
4200 void usb_ep0_reinit(struct usb_device
*udev
)
4202 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
, true);
4203 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
, true);
4204 usb_enable_endpoint(udev
, &udev
->ep0
, true);
4206 EXPORT_SYMBOL_GPL(usb_ep0_reinit
);
4208 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
4209 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
4211 static int hub_set_address(struct usb_device
*udev
, int devnum
)
4214 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
4217 * The host controller will choose the device address,
4218 * instead of the core having chosen it earlier
4220 if (!hcd
->driver
->address_device
&& devnum
<= 1)
4222 if (udev
->state
== USB_STATE_ADDRESS
)
4224 if (udev
->state
!= USB_STATE_DEFAULT
)
4226 if (hcd
->driver
->address_device
)
4227 retval
= hcd
->driver
->address_device(hcd
, udev
);
4229 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
4230 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
4231 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
4233 update_devnum(udev
, devnum
);
4234 /* Device now using proper address. */
4235 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
4236 usb_ep0_reinit(udev
);
4242 * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM
4243 * when they're plugged into a USB 2.0 port, but they don't work when LPM is
4246 * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the
4247 * device says it supports the new USB 2.0 Link PM errata by setting the BESL
4248 * support bit in the BOS descriptor.
4250 static void hub_set_initial_usb2_lpm_policy(struct usb_device
*udev
)
4252 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
4253 int connect_type
= USB_PORT_CONNECT_TYPE_UNKNOWN
;
4255 if (!udev
->usb2_hw_lpm_capable
|| !udev
->bos
)
4259 connect_type
= hub
->ports
[udev
->portnum
- 1]->connect_type
;
4261 if ((udev
->bos
->ext_cap
->bmAttributes
& cpu_to_le32(USB_BESL_SUPPORT
)) ||
4262 connect_type
== USB_PORT_CONNECT_TYPE_HARD_WIRED
) {
4263 udev
->usb2_hw_lpm_allowed
= 1;
4264 usb_set_usb2_hardware_lpm(udev
, 1);
4268 static int hub_enable_device(struct usb_device
*udev
)
4270 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
4272 if (!hcd
->driver
->enable_device
)
4274 if (udev
->state
== USB_STATE_ADDRESS
)
4276 if (udev
->state
!= USB_STATE_DEFAULT
)
4279 return hcd
->driver
->enable_device(hcd
, udev
);
4282 /* Reset device, (re)assign address, get device descriptor.
4283 * Device connection must be stable, no more debouncing needed.
4284 * Returns device in USB_STATE_ADDRESS, except on error.
4286 * If this is called for an already-existing device (as part of
4287 * usb_reset_and_verify_device), the caller must own the device lock and
4288 * the port lock. For a newly detected device that is not accessible
4289 * through any global pointers, it's not necessary to lock the device,
4290 * but it is still necessary to lock the port.
4293 hub_port_init(struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
4296 struct usb_device
*hdev
= hub
->hdev
;
4297 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
4298 int retries
, operations
, retval
, i
;
4299 unsigned delay
= HUB_SHORT_RESET_TIME
;
4300 enum usb_device_speed oldspeed
= udev
->speed
;
4302 int devnum
= udev
->devnum
;
4304 /* root hub ports have a slightly longer reset period
4305 * (from USB 2.0 spec, section 7.1.7.5)
4307 if (!hdev
->parent
) {
4308 delay
= HUB_ROOT_RESET_TIME
;
4309 if (port1
== hdev
->bus
->otg_port
)
4310 hdev
->bus
->b_hnp_enable
= 0;
4313 /* Some low speed devices have problems with the quick delay, so */
4314 /* be a bit pessimistic with those devices. RHbug #23670 */
4315 if (oldspeed
== USB_SPEED_LOW
)
4316 delay
= HUB_LONG_RESET_TIME
;
4318 mutex_lock(hcd
->address0_mutex
);
4320 /* Reset the device; full speed may morph to high speed */
4321 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
4322 retval
= hub_port_reset(hub
, port1
, udev
, delay
, false);
4323 if (retval
< 0) /* error or disconnect */
4325 /* success, speed is known */
4329 /* Don't allow speed changes at reset, except usb 3.0 to faster */
4330 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
&&
4331 !(oldspeed
== USB_SPEED_SUPER
&& udev
->speed
> oldspeed
)) {
4332 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
4335 oldspeed
= udev
->speed
;
4337 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
4338 * it's fixed size except for full speed devices.
4339 * For Wireless USB devices, ep0 max packet is always 512 (tho
4340 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
4342 switch (udev
->speed
) {
4343 case USB_SPEED_SUPER_PLUS
:
4344 case USB_SPEED_SUPER
:
4345 case USB_SPEED_WIRELESS
: /* fixed at 512 */
4346 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(512);
4348 case USB_SPEED_HIGH
: /* fixed at 64 */
4349 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
4351 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
4352 /* to determine the ep0 maxpacket size, try to read
4353 * the device descriptor to get bMaxPacketSize0 and
4354 * then correct our initial guess.
4356 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
4358 case USB_SPEED_LOW
: /* fixed at 8 */
4359 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(8);
4365 if (udev
->speed
== USB_SPEED_WIRELESS
)
4366 speed
= "variable speed Wireless";
4368 speed
= usb_speed_string(udev
->speed
);
4370 if (udev
->speed
< USB_SPEED_SUPER
)
4371 dev_info(&udev
->dev
,
4372 "%s %s USB device number %d using %s\n",
4373 (udev
->config
) ? "reset" : "new", speed
,
4374 devnum
, udev
->bus
->controller
->driver
->name
);
4376 /* Set up TT records, if needed */
4378 udev
->tt
= hdev
->tt
;
4379 udev
->ttport
= hdev
->ttport
;
4380 } else if (udev
->speed
!= USB_SPEED_HIGH
4381 && hdev
->speed
== USB_SPEED_HIGH
) {
4383 dev_err(&udev
->dev
, "parent hub has no TT\n");
4387 udev
->tt
= &hub
->tt
;
4388 udev
->ttport
= port1
;
4391 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
4392 * Because device hardware and firmware is sometimes buggy in
4393 * this area, and this is how Linux has done it for ages.
4394 * Change it cautiously.
4396 * NOTE: If use_new_scheme() is true we will start by issuing
4397 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
4398 * so it may help with some non-standards-compliant devices.
4399 * Otherwise we start with SET_ADDRESS and then try to read the
4400 * first 8 bytes of the device descriptor to get the ep0 maxpacket
4403 for (retries
= 0; retries
< GET_DESCRIPTOR_TRIES
; (++retries
, msleep(100))) {
4404 bool did_new_scheme
= false;
4406 if (use_new_scheme(udev
, retry_counter
)) {
4407 struct usb_device_descriptor
*buf
;
4410 did_new_scheme
= true;
4411 retval
= hub_enable_device(udev
);
4414 "hub failed to enable device, error %d\n",
4419 #define GET_DESCRIPTOR_BUFSIZE 64
4420 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
4426 /* Retry on all errors; some devices are flakey.
4427 * 255 is for WUSB devices, we actually need to use
4428 * 512 (WUSB1.0[4.8.1]).
4430 for (operations
= 0; operations
< 3; ++operations
) {
4431 buf
->bMaxPacketSize0
= 0;
4432 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
4433 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
4434 USB_DT_DEVICE
<< 8, 0,
4435 buf
, GET_DESCRIPTOR_BUFSIZE
,
4436 initial_descriptor_timeout
);
4437 switch (buf
->bMaxPacketSize0
) {
4438 case 8: case 16: case 32: case 64: case 255:
4439 if (buf
->bDescriptorType
==
4451 * Some devices time out if they are powered on
4452 * when already connected. They need a second
4453 * reset. But only on the first attempt,
4454 * lest we get into a time out/reset loop
4456 if (r
== 0 || (r
== -ETIMEDOUT
&& retries
== 0))
4459 udev
->descriptor
.bMaxPacketSize0
=
4460 buf
->bMaxPacketSize0
;
4463 retval
= hub_port_reset(hub
, port1
, udev
, delay
, false);
4464 if (retval
< 0) /* error or disconnect */
4466 if (oldspeed
!= udev
->speed
) {
4468 "device reset changed speed!\n");
4474 dev_err(&udev
->dev
, "device descriptor read/64, error %d\n",
4479 #undef GET_DESCRIPTOR_BUFSIZE
4483 * If device is WUSB, we already assigned an
4484 * unauthorized address in the Connect Ack sequence;
4485 * authorization will assign the final address.
4487 if (udev
->wusb
== 0) {
4488 for (operations
= 0; operations
< SET_ADDRESS_TRIES
; ++operations
) {
4489 retval
= hub_set_address(udev
, devnum
);
4495 if (retval
!= -ENODEV
)
4496 dev_err(&udev
->dev
, "device not accepting address %d, error %d\n",
4500 if (udev
->speed
>= USB_SPEED_SUPER
) {
4501 devnum
= udev
->devnum
;
4502 dev_info(&udev
->dev
,
4503 "%s SuperSpeed%s USB device number %d using %s\n",
4504 (udev
->config
) ? "reset" : "new",
4505 (udev
->speed
== USB_SPEED_SUPER_PLUS
) ? "Plus" : "",
4506 devnum
, udev
->bus
->controller
->driver
->name
);
4509 /* cope with hardware quirkiness:
4510 * - let SET_ADDRESS settle, some device hardware wants it
4511 * - read ep0 maxpacket even for high and low speed,
4514 /* use_new_scheme() checks the speed which may have
4515 * changed since the initial look so we cache the result
4522 retval
= usb_get_device_descriptor(udev
, 8);
4524 if (retval
!= -ENODEV
)
4526 "device descriptor read/8, error %d\n",
4539 * Some superspeed devices have finished the link training process
4540 * and attached to a superspeed hub port, but the device descriptor
4541 * got from those devices show they aren't superspeed devices. Warm
4542 * reset the port attached by the devices can fix them.
4544 if ((udev
->speed
>= USB_SPEED_SUPER
) &&
4545 (le16_to_cpu(udev
->descriptor
.bcdUSB
) < 0x0300)) {
4546 dev_err(&udev
->dev
, "got a wrong device descriptor, "
4547 "warm reset device\n");
4548 hub_port_reset(hub
, port1
, udev
,
4549 HUB_BH_RESET_TIME
, true);
4554 if (udev
->descriptor
.bMaxPacketSize0
== 0xff ||
4555 udev
->speed
>= USB_SPEED_SUPER
)
4558 i
= udev
->descriptor
.bMaxPacketSize0
;
4559 if (usb_endpoint_maxp(&udev
->ep0
.desc
) != i
) {
4560 if (udev
->speed
== USB_SPEED_LOW
||
4561 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
4562 dev_err(&udev
->dev
, "Invalid ep0 maxpacket: %d\n", i
);
4566 if (udev
->speed
== USB_SPEED_FULL
)
4567 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
4569 dev_warn(&udev
->dev
, "Using ep0 maxpacket: %d\n", i
);
4570 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
4571 usb_ep0_reinit(udev
);
4574 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
4575 if (retval
< (signed)sizeof(udev
->descriptor
)) {
4576 if (retval
!= -ENODEV
)
4577 dev_err(&udev
->dev
, "device descriptor read/all, error %d\n",
4584 usb_detect_quirks(udev
);
4586 if (udev
->wusb
== 0 && le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0201) {
4587 retval
= usb_get_bos_descriptor(udev
);
4589 udev
->lpm_capable
= usb_device_supports_lpm(udev
);
4590 usb_set_lpm_parameters(udev
);
4596 /* notify HCD that we have a device connected and addressed */
4597 if (hcd
->driver
->update_device
)
4598 hcd
->driver
->update_device(hcd
, udev
);
4599 hub_set_initial_usb2_lpm_policy(udev
);
4602 hub_port_disable(hub
, port1
, 0);
4603 update_devnum(udev
, devnum
); /* for disconnect processing */
4605 mutex_unlock(hcd
->address0_mutex
);
4610 check_highspeed(struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
4612 struct usb_qualifier_descriptor
*qual
;
4615 if (udev
->quirks
& USB_QUIRK_DEVICE_QUALIFIER
)
4618 qual
= kmalloc(sizeof *qual
, GFP_KERNEL
);
4622 status
= usb_get_descriptor(udev
, USB_DT_DEVICE_QUALIFIER
, 0,
4623 qual
, sizeof *qual
);
4624 if (status
== sizeof *qual
) {
4625 dev_info(&udev
->dev
, "not running at top speed; "
4626 "connect to a high speed hub\n");
4627 /* hub LEDs are probably harder to miss than syslog */
4628 if (hub
->has_indicators
) {
4629 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
4630 queue_delayed_work(system_power_efficient_wq
,
4638 hub_power_remaining(struct usb_hub
*hub
)
4640 struct usb_device
*hdev
= hub
->hdev
;
4644 if (!hub
->limited_power
)
4647 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
4648 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
4649 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
4650 struct usb_device
*udev
= port_dev
->child
;
4656 if (hub_is_superspeed(udev
))
4662 * Unconfigured devices may not use more than one unit load,
4663 * or 8mA for OTG ports
4665 if (udev
->actconfig
)
4666 delta
= usb_get_max_power(udev
, udev
->actconfig
);
4667 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
4671 if (delta
> hub
->mA_per_port
)
4672 dev_warn(&port_dev
->dev
, "%dmA is over %umA budget!\n",
4673 delta
, hub
->mA_per_port
);
4676 if (remaining
< 0) {
4677 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
4684 static void hub_port_connect(struct usb_hub
*hub
, int port1
, u16 portstatus
,
4687 int status
= -ENODEV
;
4690 struct usb_device
*hdev
= hub
->hdev
;
4691 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
4692 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
4693 struct usb_device
*udev
= port_dev
->child
;
4694 static int unreliable_port
= -1;
4695 #ifdef CONFIG_USB_DEBUG_DETAILED_LOG
4696 dev_info (&port_dev
->dev
,
4697 "port %d, status %04x, change %04x, %s\n",
4698 port1
, portstatus
, portchange
, portspeed(hub
, portstatus
));
4701 /* Disconnect any existing devices under this port */
4703 if (hcd
->usb_phy
&& !hdev
->parent
)
4704 usb_phy_notify_disconnect(hcd
->usb_phy
, udev
->speed
);
4705 usb_disconnect(&port_dev
->child
);
4708 /* We can forget about a "removed" device when there's a physical
4709 * disconnect or the connect status changes.
4711 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
4712 (portchange
& USB_PORT_STAT_C_CONNECTION
))
4713 clear_bit(port1
, hub
->removed_bits
);
4715 if (portchange
& (USB_PORT_STAT_C_CONNECTION
|
4716 USB_PORT_STAT_C_ENABLE
)) {
4717 status
= hub_port_debounce_be_stable(hub
, port1
);
4719 if (status
!= -ENODEV
&&
4720 port1
!= unreliable_port
&&
4722 dev_err(&port_dev
->dev
, "connect-debounce failed\n");
4723 portstatus
&= ~USB_PORT_STAT_CONNECTION
;
4724 unreliable_port
= port1
;
4726 portstatus
= status
;
4730 /* Return now if debouncing failed or nothing is connected or
4731 * the device was "removed".
4733 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
4734 test_bit(port1
, hub
->removed_bits
)) {
4737 * maybe switch power back on (e.g. root hub was reset)
4738 * but only if the port isn't owned by someone else.
4740 if (hub_is_port_power_switchable(hub
)
4741 && !port_is_power_on(hub
, portstatus
)
4742 && !port_dev
->port_owner
)
4743 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
4745 if (portstatus
& USB_PORT_STAT_ENABLE
)
4749 if (hub_is_superspeed(hub
->hdev
))
4755 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
4757 /* reallocate for each attempt, since references
4758 * to the previous one can escape in various ways
4760 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
4762 dev_err(&port_dev
->dev
,
4763 "couldn't allocate usb_device\n");
4767 usb_set_device_state(udev
, USB_STATE_POWERED
);
4768 udev
->bus_mA
= hub
->mA_per_port
;
4769 udev
->level
= hdev
->level
+ 1;
4770 udev
->wusb
= hub_is_wusb(hub
);
4772 /* Devices connected to SuperSpeed hubs are USB 3.0 or later */
4773 if (hub_is_superspeed(hub
->hdev
))
4774 udev
->speed
= USB_SPEED_SUPER
;
4776 udev
->speed
= USB_SPEED_UNKNOWN
;
4778 choose_devnum(udev
);
4779 if (udev
->devnum
<= 0) {
4780 status
= -ENOTCONN
; /* Don't retry */
4784 /* reset (non-USB 3.0 devices) and get descriptor */
4785 usb_lock_port(port_dev
);
4786 status
= hub_port_init(hub
, udev
, port1
, i
);
4787 usb_unlock_port(port_dev
);
4791 if (udev
->quirks
& USB_QUIRK_DELAY_INIT
)
4794 /* consecutive bus-powered hubs aren't reliable; they can
4795 * violate the voltage drop budget. if the new child has
4796 * a "powered" LED, users should notice we didn't enable it
4797 * (without reading syslog), even without per-port LEDs
4800 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
4801 && udev
->bus_mA
<= unit_load
) {
4804 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
4807 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
4810 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
4812 "can't connect bus-powered hub "
4814 if (hub
->has_indicators
) {
4815 hub
->indicator
[port1
-1] =
4816 INDICATOR_AMBER_BLINK
;
4818 system_power_efficient_wq
,
4821 status
= -ENOTCONN
; /* Don't retry */
4826 /* check for devices running slower than they could */
4827 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
4828 && udev
->speed
== USB_SPEED_FULL
4829 && highspeed_hubs
!= 0)
4830 check_highspeed(hub
, udev
, port1
);
4832 /* Store the parent's children[] pointer. At this point
4833 * udev becomes globally accessible, although presumably
4834 * no one will look at it until hdev is unlocked.
4838 mutex_lock(&usb_port_peer_mutex
);
4840 /* We mustn't add new devices if the parent hub has
4841 * been disconnected; we would race with the
4842 * recursively_mark_NOTATTACHED() routine.
4844 spin_lock_irq(&device_state_lock
);
4845 if (hdev
->state
== USB_STATE_NOTATTACHED
)
4848 port_dev
->child
= udev
;
4849 spin_unlock_irq(&device_state_lock
);
4850 mutex_unlock(&usb_port_peer_mutex
);
4852 /* Run it through the hoops (find a driver, etc) */
4854 status
= usb_new_device(udev
);
4856 mutex_lock(&usb_port_peer_mutex
);
4857 spin_lock_irq(&device_state_lock
);
4858 port_dev
->child
= NULL
;
4859 spin_unlock_irq(&device_state_lock
);
4860 mutex_unlock(&usb_port_peer_mutex
);
4862 if (hcd
->usb_phy
&& !hdev
->parent
)
4863 usb_phy_notify_connect(hcd
->usb_phy
,
4871 status
= hub_power_remaining(hub
);
4873 dev_dbg(hub
->intfdev
, "%dmA power budget left\n", status
);
4878 hub_port_disable(hub
, port1
, 1);
4880 usb_ep0_reinit(udev
);
4881 release_devnum(udev
);
4884 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
4887 /* When halfway through our retry count, power-cycle the port */
4888 if (i
== (SET_CONFIG_TRIES
/ 2) - 1) {
4889 dev_info(&port_dev
->dev
, "attempt power cycle\n");
4890 usb_hub_set_port_power(hdev
, hub
, port1
, false);
4891 msleep(2 * hub_power_on_good_delay(hub
));
4892 usb_hub_set_port_power(hdev
, hub
, port1
, true);
4893 msleep(hub_power_on_good_delay(hub
));
4896 if (hub
->hdev
->parent
||
4897 !hcd
->driver
->port_handed_over
||
4898 !(hcd
->driver
->port_handed_over
)(hcd
, port1
)) {
4899 if (status
!= -ENOTCONN
&& status
!= -ENODEV
)
4900 dev_err(&port_dev
->dev
,
4901 "unable to enumerate USB device\n");
4905 hub_port_disable(hub
, port1
, 1);
4906 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
) {
4907 if (status
!= -ENOTCONN
&& status
!= -ENODEV
)
4908 hcd
->driver
->relinquish_port(hcd
, port1
);
4912 /* Handle physical or logical connection change events.
4913 * This routine is called when:
4914 * a port connection-change occurs;
4915 * a port enable-change occurs (often caused by EMI);
4916 * usb_reset_and_verify_device() encounters changed descriptors (as from
4917 * a firmware download)
4918 * caller already locked the hub
4920 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
4921 u16 portstatus
, u16 portchange
)
4922 __must_hold(&port_dev
->status_lock
)
4924 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
4925 struct usb_device
*udev
= port_dev
->child
;
4926 int status
= -ENODEV
;
4928 dev_dbg(&port_dev
->dev
, "status %04x, change %04x, %s\n", portstatus
,
4929 portchange
, portspeed(hub
, portstatus
));
4931 if (hub
->has_indicators
) {
4932 set_port_led(hub
, port1
, HUB_LED_AUTO
);
4933 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
4936 #ifdef CONFIG_USB_OTG
4937 /* during HNP, don't repeat the debounce */
4938 if (hub
->hdev
->bus
->is_b_host
)
4939 portchange
&= ~(USB_PORT_STAT_C_CONNECTION
|
4940 USB_PORT_STAT_C_ENABLE
);
4943 /* Try to resuscitate an existing device */
4944 if ((portstatus
& USB_PORT_STAT_CONNECTION
) && udev
&&
4945 udev
->state
!= USB_STATE_NOTATTACHED
) {
4946 if (portstatus
& USB_PORT_STAT_ENABLE
) {
4947 status
= 0; /* Nothing to do */
4949 } else if (udev
->state
== USB_STATE_SUSPENDED
&&
4950 udev
->persist_enabled
) {
4951 /* For a suspended device, treat this as a
4952 * remote wakeup event.
4954 usb_unlock_port(port_dev
);
4955 status
= usb_remote_wakeup(udev
);
4956 usb_lock_port(port_dev
);
4959 /* Don't resuscitate */;
4962 clear_bit(port1
, hub
->change_bits
);
4964 /* successfully revalidated the connection */
4968 usb_unlock_port(port_dev
);
4969 hub_port_connect(hub
, port1
, portstatus
, portchange
);
4970 usb_lock_port(port_dev
);
4973 static void port_event(struct usb_hub
*hub
, int port1
)
4974 __must_hold(&port_dev
->status_lock
)
4977 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
4978 struct usb_device
*udev
= port_dev
->child
;
4979 struct usb_device
*hdev
= hub
->hdev
;
4980 u16 portstatus
, portchange
;
4982 connect_change
= test_bit(port1
, hub
->change_bits
);
4983 clear_bit(port1
, hub
->event_bits
);
4984 clear_bit(port1
, hub
->wakeup_bits
);
4986 if (hub_port_status(hub
, port1
, &portstatus
, &portchange
) < 0)
4989 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
4990 usb_clear_port_feature(hdev
, port1
, USB_PORT_FEAT_C_CONNECTION
);
4994 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
4995 if (!connect_change
)
4996 dev_dbg(&port_dev
->dev
, "enable change, status %08x\n",
4998 usb_clear_port_feature(hdev
, port1
, USB_PORT_FEAT_C_ENABLE
);
5001 * EM interference sometimes causes badly shielded USB devices
5002 * to be shutdown by the hub, this hack enables them again.
5003 * Works at least with mouse driver.
5005 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
5006 && !connect_change
&& udev
) {
5007 dev_err(&port_dev
->dev
, "disabled by hub (EMI?), re-enabling...\n");
5012 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
5013 u16 status
= 0, unused
;
5015 dev_dbg(&port_dev
->dev
, "over-current change\n");
5016 usb_clear_port_feature(hdev
, port1
,
5017 USB_PORT_FEAT_C_OVER_CURRENT
);
5018 msleep(100); /* Cool down */
5019 hub_power_on(hub
, true);
5020 hub_port_status(hub
, port1
, &status
, &unused
);
5021 if (status
& USB_PORT_STAT_OVERCURRENT
)
5022 dev_err(&port_dev
->dev
, "over-current condition\n");
5025 if (portchange
& USB_PORT_STAT_C_RESET
) {
5026 dev_dbg(&port_dev
->dev
, "reset change\n");
5027 usb_clear_port_feature(hdev
, port1
, USB_PORT_FEAT_C_RESET
);
5029 if ((portchange
& USB_PORT_STAT_C_BH_RESET
)
5030 && hub_is_superspeed(hdev
)) {
5031 dev_dbg(&port_dev
->dev
, "warm reset change\n");
5032 usb_clear_port_feature(hdev
, port1
,
5033 USB_PORT_FEAT_C_BH_PORT_RESET
);
5035 if (portchange
& USB_PORT_STAT_C_LINK_STATE
) {
5036 dev_dbg(&port_dev
->dev
, "link state change\n");
5037 usb_clear_port_feature(hdev
, port1
,
5038 USB_PORT_FEAT_C_PORT_LINK_STATE
);
5040 if (portchange
& USB_PORT_STAT_C_CONFIG_ERROR
) {
5041 dev_warn(&port_dev
->dev
, "config error\n");
5042 usb_clear_port_feature(hdev
, port1
,
5043 USB_PORT_FEAT_C_PORT_CONFIG_ERROR
);
5046 /* skip port actions that require the port to be powered on */
5047 if (!pm_runtime_active(&port_dev
->dev
))
5050 if (hub_handle_remote_wakeup(hub
, port1
, portstatus
, portchange
))
5054 * Warm reset a USB3 protocol port if it's in
5055 * SS.Inactive state.
5057 if (hub_port_warm_reset_required(hub
, port1
, portstatus
)) {
5058 dev_dbg(&port_dev
->dev
, "do warm reset\n");
5059 if (!udev
|| !(portstatus
& USB_PORT_STAT_CONNECTION
)
5060 || udev
->state
== USB_STATE_NOTATTACHED
) {
5061 if (hub_port_reset(hub
, port1
, NULL
,
5062 HUB_BH_RESET_TIME
, true) < 0)
5063 hub_port_disable(hub
, port1
, 1);
5065 usb_unlock_port(port_dev
);
5066 usb_lock_device(udev
);
5067 usb_reset_device(udev
);
5068 usb_unlock_device(udev
);
5069 usb_lock_port(port_dev
);
5075 hub_port_connect_change(hub
, port1
, portstatus
, portchange
);
5078 static void hub_event(struct work_struct
*work
)
5080 struct usb_device
*hdev
;
5081 struct usb_interface
*intf
;
5082 struct usb_hub
*hub
;
5083 struct device
*hub_dev
;
5084 struct usb_hcd
*hcd
;
5089 hub
= container_of(work
, struct usb_hub
, events
);
5091 hub_dev
= hub
->intfdev
;
5092 hcd
= bus_to_hcd(hdev
->bus
);
5093 intf
= to_usb_interface(hub_dev
);
5095 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
5096 hdev
->state
, hdev
->maxchild
,
5097 /* NOTE: expects max 15 ports... */
5098 (u16
) hub
->change_bits
[0],
5099 (u16
) hub
->event_bits
[0]);
5101 /* Lock the device, then check to see if we were
5102 * disconnected while waiting for the lock to succeed. */
5103 usb_lock_device(hdev
);
5104 hcd
->is_in_hub_event
= true;
5105 if (unlikely(hub
->disconnected
))
5108 /* If the hub has died, clean up after it */
5109 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
5110 hub
->error
= -ENODEV
;
5111 hub_quiesce(hub
, HUB_DISCONNECT
);
5116 ret
= usb_autopm_get_interface(intf
);
5118 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
5122 /* If this is an inactive hub, do nothing */
5127 dev_dbg(hub_dev
, "resetting for error %d\n", hub
->error
);
5129 ret
= usb_reset_device(hdev
);
5131 dev_dbg(hub_dev
, "error resetting hub: %d\n", ret
);
5139 /* deal with port status changes */
5140 for (i
= 1; i
<= hdev
->maxchild
; i
++) {
5141 struct usb_port
*port_dev
= hub
->ports
[i
- 1];
5143 if (test_bit(i
, hub
->event_bits
)
5144 || test_bit(i
, hub
->change_bits
)
5145 || test_bit(i
, hub
->wakeup_bits
)) {
5147 * The get_noresume and barrier ensure that if
5148 * the port was in the process of resuming, we
5149 * flush that work and keep the port active for
5150 * the duration of the port_event(). However,
5151 * if the port is runtime pm suspended
5152 * (powered-off), we leave it in that state, run
5153 * an abbreviated port_event(), and move on.
5155 pm_runtime_get_noresume(&port_dev
->dev
);
5156 pm_runtime_barrier(&port_dev
->dev
);
5157 usb_lock_port(port_dev
);
5159 usb_unlock_port(port_dev
);
5160 pm_runtime_put_sync(&port_dev
->dev
);
5164 /* deal with hub status changes */
5165 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
5167 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
5168 dev_err(hub_dev
, "get_hub_status failed\n");
5170 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
5171 dev_dbg(hub_dev
, "power change\n");
5172 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
5173 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
5174 /* FIXME: Is this always true? */
5175 hub
->limited_power
= 1;
5177 hub
->limited_power
= 0;
5179 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
5183 dev_dbg(hub_dev
, "over-current change\n");
5184 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
5185 msleep(500); /* Cool down */
5186 hub_power_on(hub
, true);
5187 hub_hub_status(hub
, &status
, &unused
);
5188 if (status
& HUB_STATUS_OVERCURRENT
)
5189 dev_err(hub_dev
, "over-current condition\n");
5194 /* Balance the usb_autopm_get_interface() above */
5195 usb_autopm_put_interface_no_suspend(intf
);
5197 hcd
->is_in_hub_event
= false;
5198 usb_unlock_device(hdev
);
5200 /* Balance the stuff in kick_hub_wq() and allow autosuspend */
5201 usb_autopm_put_interface(intf
);
5202 kref_put(&hub
->kref
, hub_release
);
5205 static const struct usb_device_id hub_id_table
[] = {
5206 { .match_flags
= USB_DEVICE_ID_MATCH_VENDOR
5207 | USB_DEVICE_ID_MATCH_INT_CLASS
,
5208 .idVendor
= USB_VENDOR_GENESYS_LOGIC
,
5209 .bInterfaceClass
= USB_CLASS_HUB
,
5210 .driver_info
= HUB_QUIRK_CHECK_PORT_AUTOSUSPEND
},
5211 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
5212 .bDeviceClass
= USB_CLASS_HUB
},
5213 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
5214 .bInterfaceClass
= USB_CLASS_HUB
},
5215 { } /* Terminating entry */
5218 MODULE_DEVICE_TABLE(usb
, hub_id_table
);
5220 static struct usb_driver hub_driver
= {
5223 .disconnect
= hub_disconnect
,
5224 .suspend
= hub_suspend
,
5225 .resume
= hub_resume
,
5226 .reset_resume
= hub_reset_resume
,
5227 .pre_reset
= hub_pre_reset
,
5228 .post_reset
= hub_post_reset
,
5229 .unlocked_ioctl
= hub_ioctl
,
5230 .id_table
= hub_id_table
,
5231 .supports_autosuspend
= 1,
5234 int usb_hub_init(void)
5236 if (usb_register(&hub_driver
) < 0) {
5237 printk(KERN_ERR
"%s: can't register hub driver\n",
5243 * The workqueue needs to be freezable to avoid interfering with
5244 * USB-PERSIST port handover. Otherwise it might see that a full-speed
5245 * device was gone before the EHCI controller had handed its port
5246 * over to the companion full-speed controller.
5248 hub_wq
= alloc_workqueue("usb_hub_wq", WQ_FREEZABLE
, 0);
5252 /* Fall through if kernel_thread failed */
5253 usb_deregister(&hub_driver
);
5254 pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name
);
5259 void usb_hub_cleanup(void)
5261 destroy_workqueue(hub_wq
);
5264 * Hub resources are freed for us by usb_deregister. It calls
5265 * usb_driver_purge on every device which in turn calls that
5266 * devices disconnect function if it is using this driver.
5267 * The hub_disconnect function takes care of releasing the
5268 * individual hub resources. -greg
5270 usb_deregister(&hub_driver
);
5271 } /* usb_hub_cleanup() */
5273 static int descriptors_changed(struct usb_device
*udev
,
5274 struct usb_device_descriptor
*old_device_descriptor
,
5275 struct usb_host_bos
*old_bos
)
5279 unsigned serial_len
= 0;
5281 unsigned old_length
;
5285 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
5286 sizeof(*old_device_descriptor
)) != 0)
5289 if ((old_bos
&& !udev
->bos
) || (!old_bos
&& udev
->bos
))
5292 len
= le16_to_cpu(udev
->bos
->desc
->wTotalLength
);
5293 if (len
!= le16_to_cpu(old_bos
->desc
->wTotalLength
))
5295 if (memcmp(udev
->bos
->desc
, old_bos
->desc
, len
))
5299 /* Since the idVendor, idProduct, and bcdDevice values in the
5300 * device descriptor haven't changed, we will assume the
5301 * Manufacturer and Product strings haven't changed either.
5302 * But the SerialNumber string could be different (e.g., a
5303 * different flash card of the same brand).
5306 serial_len
= strlen(udev
->serial
) + 1;
5309 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
5310 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
5311 len
= max(len
, old_length
);
5314 buf
= kmalloc(len
, GFP_NOIO
);
5316 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
5317 /* assume the worst */
5320 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
5321 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
5322 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
5324 if (length
!= old_length
) {
5325 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
5330 if (memcmp(buf
, udev
->rawdescriptors
[index
], old_length
)
5332 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
5334 ((struct usb_config_descriptor
*) buf
)->
5335 bConfigurationValue
);
5341 if (!changed
&& serial_len
) {
5342 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
5344 if (length
+ 1 != serial_len
) {
5345 dev_dbg(&udev
->dev
, "serial string error %d\n",
5348 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
5349 dev_dbg(&udev
->dev
, "serial string changed\n");
5359 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
5360 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5362 * WARNING - don't use this routine to reset a composite device
5363 * (one with multiple interfaces owned by separate drivers)!
5364 * Use usb_reset_device() instead.
5366 * Do a port reset, reassign the device's address, and establish its
5367 * former operating configuration. If the reset fails, or the device's
5368 * descriptors change from their values before the reset, or the original
5369 * configuration and altsettings cannot be restored, a flag will be set
5370 * telling hub_wq to pretend the device has been disconnected and then
5371 * re-connected. All drivers will be unbound, and the device will be
5372 * re-enumerated and probed all over again.
5374 * Return: 0 if the reset succeeded, -ENODEV if the device has been
5375 * flagged for logical disconnection, or some other negative error code
5376 * if the reset wasn't even attempted.
5379 * The caller must own the device lock and the port lock, the latter is
5380 * taken by usb_reset_device(). For example, it's safe to use
5381 * usb_reset_device() from a driver probe() routine after downloading
5382 * new firmware. For calls that might not occur during probe(), drivers
5383 * should lock the device using usb_lock_device_for_reset().
5385 * Locking exception: This routine may also be called from within an
5386 * autoresume handler. Such usage won't conflict with other tasks
5387 * holding the device lock because these tasks should always call
5388 * usb_autopm_resume_device(), thereby preventing any unwanted
5389 * autoresume. The autoresume handler is expected to have already
5390 * acquired the port lock before calling this routine.
5392 static int usb_reset_and_verify_device(struct usb_device
*udev
)
5394 struct usb_device
*parent_hdev
= udev
->parent
;
5395 struct usb_hub
*parent_hub
;
5396 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
5397 struct usb_device_descriptor descriptor
= udev
->descriptor
;
5398 struct usb_host_bos
*bos
;
5400 int port1
= udev
->portnum
;
5402 if (udev
->state
== USB_STATE_NOTATTACHED
||
5403 udev
->state
== USB_STATE_SUSPENDED
) {
5404 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
5412 parent_hub
= usb_hub_to_struct_hub(parent_hdev
);
5414 /* Disable USB2 hardware LPM.
5415 * It will be re-enabled by the enumeration process.
5417 if (udev
->usb2_hw_lpm_enabled
== 1)
5418 usb_set_usb2_hardware_lpm(udev
, 0);
5420 /* Disable LPM and LTM while we reset the device and reinstall the alt
5421 * settings. Device-initiated LPM settings, and system exit latency
5422 * settings are cleared when the device is reset, so we have to set
5425 ret
= usb_unlocked_disable_lpm(udev
);
5427 dev_err(&udev
->dev
, "%s Failed to disable LPM\n.", __func__
);
5428 goto re_enumerate_no_bos
;
5430 ret
= usb_disable_ltm(udev
);
5432 dev_err(&udev
->dev
, "%s Failed to disable LTM\n.",
5434 goto re_enumerate_no_bos
;
5440 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
5442 /* ep0 maxpacket size may change; let the HCD know about it.
5443 * Other endpoints will be handled by re-enumeration. */
5444 usb_ep0_reinit(udev
);
5445 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
5446 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
5453 /* Device might have changed firmware (DFU or similar) */
5454 if (descriptors_changed(udev
, &descriptor
, bos
)) {
5455 dev_info(&udev
->dev
, "device firmware changed\n");
5456 udev
->descriptor
= descriptor
; /* for disconnect() calls */
5460 /* Restore the device's previous configuration */
5461 if (!udev
->actconfig
)
5464 mutex_lock(hcd
->bandwidth_mutex
);
5465 ret
= usb_hcd_alloc_bandwidth(udev
, udev
->actconfig
, NULL
, NULL
);
5467 dev_warn(&udev
->dev
,
5468 "Busted HC? Not enough HCD resources for "
5469 "old configuration.\n");
5470 mutex_unlock(hcd
->bandwidth_mutex
);
5473 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
5474 USB_REQ_SET_CONFIGURATION
, 0,
5475 udev
->actconfig
->desc
.bConfigurationValue
, 0,
5476 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
5479 "can't restore configuration #%d (error=%d)\n",
5480 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
5481 mutex_unlock(hcd
->bandwidth_mutex
);
5484 mutex_unlock(hcd
->bandwidth_mutex
);
5485 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
5487 /* Put interfaces back into the same altsettings as before.
5488 * Don't bother to send the Set-Interface request for interfaces
5489 * that were already in altsetting 0; besides being unnecessary,
5490 * many devices can't handle it. Instead just reset the host-side
5493 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
5494 struct usb_host_config
*config
= udev
->actconfig
;
5495 struct usb_interface
*intf
= config
->interface
[i
];
5496 struct usb_interface_descriptor
*desc
;
5498 desc
= &intf
->cur_altsetting
->desc
;
5499 if (desc
->bAlternateSetting
== 0) {
5500 usb_disable_interface(udev
, intf
, true);
5501 usb_enable_interface(udev
, intf
, true);
5504 /* Let the bandwidth allocation function know that this
5505 * device has been reset, and it will have to use
5506 * alternate setting 0 as the current alternate setting.
5508 intf
->resetting_device
= 1;
5509 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
5510 desc
->bAlternateSetting
);
5511 intf
->resetting_device
= 0;
5514 dev_err(&udev
->dev
, "failed to restore interface %d "
5515 "altsetting %d (error=%d)\n",
5516 desc
->bInterfaceNumber
,
5517 desc
->bAlternateSetting
,
5521 /* Resetting also frees any allocated streams */
5522 for (j
= 0; j
< intf
->cur_altsetting
->desc
.bNumEndpoints
; j
++)
5523 intf
->cur_altsetting
->endpoint
[j
].streams
= 0;
5527 /* Now that the alt settings are re-installed, enable LTM and LPM. */
5528 usb_set_usb2_hardware_lpm(udev
, 1);
5529 usb_unlocked_enable_lpm(udev
);
5530 usb_enable_ltm(udev
);
5531 usb_release_bos_descriptor(udev
);
5536 usb_release_bos_descriptor(udev
);
5538 re_enumerate_no_bos
:
5539 /* LPM state doesn't matter when we're about to destroy the device. */
5540 hub_port_logical_disconnect(parent_hub
, port1
);
5545 * usb_reset_device - warn interface drivers and perform a USB port reset
5546 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5548 * Warns all drivers bound to registered interfaces (using their pre_reset
5549 * method), performs the port reset, and then lets the drivers know that
5550 * the reset is over (using their post_reset method).
5552 * Return: The same as for usb_reset_and_verify_device().
5555 * The caller must own the device lock. For example, it's safe to use
5556 * this from a driver probe() routine after downloading new firmware.
5557 * For calls that might not occur during probe(), drivers should lock
5558 * the device using usb_lock_device_for_reset().
5560 * If an interface is currently being probed or disconnected, we assume
5561 * its driver knows how to handle resets. For all other interfaces,
5562 * if the driver doesn't have pre_reset and post_reset methods then
5563 * we attempt to unbind it and rebind afterward.
5565 int usb_reset_device(struct usb_device
*udev
)
5569 unsigned int noio_flag
;
5570 struct usb_port
*port_dev
;
5571 struct usb_host_config
*config
= udev
->actconfig
;
5572 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
5574 if (udev
->state
== USB_STATE_NOTATTACHED
||
5575 udev
->state
== USB_STATE_SUSPENDED
) {
5576 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
5581 if (!udev
->parent
) {
5582 /* this requires hcd-specific logic; see ohci_restart() */
5583 dev_dbg(&udev
->dev
, "%s for root hub!\n", __func__
);
5587 port_dev
= hub
->ports
[udev
->portnum
- 1];
5590 * Don't allocate memory with GFP_KERNEL in current
5591 * context to avoid possible deadlock if usb mass
5592 * storage interface or usbnet interface(iSCSI case)
5593 * is included in current configuration. The easist
5594 * approach is to do it for every device reset,
5595 * because the device 'memalloc_noio' flag may have
5596 * not been set before reseting the usb device.
5598 noio_flag
= memalloc_noio_save();
5600 /* Prevent autosuspend during the reset */
5601 usb_autoresume_device(udev
);
5604 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
5605 struct usb_interface
*cintf
= config
->interface
[i
];
5606 struct usb_driver
*drv
;
5609 if (cintf
->dev
.driver
) {
5610 drv
= to_usb_driver(cintf
->dev
.driver
);
5611 if (drv
->pre_reset
&& drv
->post_reset
)
5612 unbind
= (drv
->pre_reset
)(cintf
);
5613 else if (cintf
->condition
==
5614 USB_INTERFACE_BOUND
)
5617 usb_forced_unbind_intf(cintf
);
5622 usb_lock_port(port_dev
);
5623 ret
= usb_reset_and_verify_device(udev
);
5624 usb_unlock_port(port_dev
);
5627 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
5628 struct usb_interface
*cintf
= config
->interface
[i
];
5629 struct usb_driver
*drv
;
5630 int rebind
= cintf
->needs_binding
;
5632 if (!rebind
&& cintf
->dev
.driver
) {
5633 drv
= to_usb_driver(cintf
->dev
.driver
);
5634 if (drv
->post_reset
)
5635 rebind
= (drv
->post_reset
)(cintf
);
5636 else if (cintf
->condition
==
5637 USB_INTERFACE_BOUND
)
5640 cintf
->needs_binding
= 1;
5643 usb_unbind_and_rebind_marked_interfaces(udev
);
5646 usb_autosuspend_device(udev
);
5647 memalloc_noio_restore(noio_flag
);
5650 EXPORT_SYMBOL_GPL(usb_reset_device
);
5654 * usb_queue_reset_device - Reset a USB device from an atomic context
5655 * @iface: USB interface belonging to the device to reset
5657 * This function can be used to reset a USB device from an atomic
5658 * context, where usb_reset_device() won't work (as it blocks).
5660 * Doing a reset via this method is functionally equivalent to calling
5661 * usb_reset_device(), except for the fact that it is delayed to a
5662 * workqueue. This means that any drivers bound to other interfaces
5663 * might be unbound, as well as users from usbfs in user space.
5667 * - Scheduling two resets at the same time from two different drivers
5668 * attached to two different interfaces of the same device is
5669 * possible; depending on how the driver attached to each interface
5670 * handles ->pre_reset(), the second reset might happen or not.
5672 * - If the reset is delayed so long that the interface is unbound from
5673 * its driver, the reset will be skipped.
5675 * - This function can be called during .probe(). It can also be called
5676 * during .disconnect(), but doing so is pointless because the reset
5677 * will not occur. If you really want to reset the device during
5678 * .disconnect(), call usb_reset_device() directly -- but watch out
5679 * for nested unbinding issues!
5681 void usb_queue_reset_device(struct usb_interface
*iface
)
5683 if (schedule_work(&iface
->reset_ws
))
5684 usb_get_intf(iface
);
5686 EXPORT_SYMBOL_GPL(usb_queue_reset_device
);
5689 * usb_hub_find_child - Get the pointer of child device
5690 * attached to the port which is specified by @port1.
5691 * @hdev: USB device belonging to the usb hub
5692 * @port1: port num to indicate which port the child device
5695 * USB drivers call this function to get hub's child device
5698 * Return: %NULL if input param is invalid and
5699 * child's usb_device pointer if non-NULL.
5701 struct usb_device
*usb_hub_find_child(struct usb_device
*hdev
,
5704 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5706 if (port1
< 1 || port1
> hdev
->maxchild
)
5708 return hub
->ports
[port1
- 1]->child
;
5710 EXPORT_SYMBOL_GPL(usb_hub_find_child
);
5712 void usb_hub_adjust_deviceremovable(struct usb_device
*hdev
,
5713 struct usb_hub_descriptor
*desc
)
5715 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5716 enum usb_port_connect_type connect_type
;
5722 if (!hub_is_superspeed(hdev
)) {
5723 for (i
= 1; i
<= hdev
->maxchild
; i
++) {
5724 struct usb_port
*port_dev
= hub
->ports
[i
- 1];
5726 connect_type
= port_dev
->connect_type
;
5727 if (connect_type
== USB_PORT_CONNECT_TYPE_HARD_WIRED
) {
5728 u8 mask
= 1 << (i
%8);
5730 if (!(desc
->u
.hs
.DeviceRemovable
[i
/8] & mask
)) {
5731 dev_dbg(&port_dev
->dev
, "DeviceRemovable is changed to 1 according to platform information.\n");
5732 desc
->u
.hs
.DeviceRemovable
[i
/8] |= mask
;
5737 u16 port_removable
= le16_to_cpu(desc
->u
.ss
.DeviceRemovable
);
5739 for (i
= 1; i
<= hdev
->maxchild
; i
++) {
5740 struct usb_port
*port_dev
= hub
->ports
[i
- 1];
5742 connect_type
= port_dev
->connect_type
;
5743 if (connect_type
== USB_PORT_CONNECT_TYPE_HARD_WIRED
) {
5746 if (!(port_removable
& mask
)) {
5747 dev_dbg(&port_dev
->dev
, "DeviceRemovable is changed to 1 according to platform information.\n");
5748 port_removable
|= mask
;
5753 desc
->u
.ss
.DeviceRemovable
= cpu_to_le16(port_removable
);
5759 * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
5760 * @hdev: USB device belonging to the usb hub
5761 * @port1: port num of the port
5763 * Return: Port's acpi handle if successful, %NULL if params are
5766 acpi_handle
usb_get_hub_port_acpi_handle(struct usb_device
*hdev
,
5769 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5774 return ACPI_HANDLE(&hub
->ports
[port1
- 1]->dev
);