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/kthread.h>
26 #include <linux/mutex.h>
27 #include <linux/freezer.h>
28 #include <linux/random.h>
29 #include <linux/pm_qos.h>
31 #include <asm/uaccess.h>
32 #include <asm/byteorder.h>
36 #ifdef CONFIG_MTK_ICUSB_SUPPORT
37 int is_musbfsh_rh(struct usb_device
*udev
);
38 void set_icusb_sts_disconnect_done(void);
41 #ifdef CONFIG_MTK_DT_USB_SUPPORT
42 #include <linux/proc_fs.h>
43 #include <linux/uaccess.h>
44 static struct usb_device
*g_dsda_dev
= NULL
;
46 #ifdef CONFIG_PM_RUNTIME
47 struct usb_hub
*usb11_hub
= NULL
;
48 int is_musbfsh_rh(struct usb_device
*udev
);
50 struct usb_device
*get_usb11_child_udev(void)
54 return usb11_hub
->ports
[0]->child
;
62 void dump_data(char *buf
, int len
)
65 for(i
=0 ; i
< len
; i
++)
67 MYDBG("data[%d]: %x\n", i
, buf
[i
]);
71 void test_dsda_device_ep0(void)
76 ret
= usb_control_msg(g_dsda_dev
, usb_rcvctrlpipe(g_dsda_dev
, 0),
77 USB_REQ_GET_DESCRIPTOR
,
83 USB_CTRL_GET_TIMEOUT
);
88 MYDBG("test ep fail, ret : %d\n", ret
);
92 MYDBG("test ep0 ok, ret : %d\n", ret
);
93 dump_data(data_buf
, ret
);
98 void release_usb11_wakelock(void);
99 static ssize_t
dsda_tmp_proc_entry(struct file
*file_ptr
, const char __user
*user_buffer
, size_t count
, loff_t
*position
)
103 int ret
= copy_from_user((char *) &cmd
, user_buffer
, count
);
110 /* apply action here */
114 test_dsda_device_ep0();
119 release_usb11_wakelock();
127 struct file_operations dsda_tmp_proc_fops
= {
128 .write
= dsda_tmp_proc_entry
132 void create_dsda_tmp_entry(void)
134 struct proc_dir_entry
*prEntry
;
138 prEntry
= proc_create("DSDA_TMP_ENTRY", 0660, 0, &dsda_tmp_proc_fops
);
141 MYDBG("add /proc/DSDA_TMP_ENTRY ok\n");
145 MYDBG("add /proc/DSDA_TMP_ENTRY fail\n");
150 /* if we are in debug mode, always announce new devices */
152 #ifndef CONFIG_USB_ANNOUNCE_NEW_DEVICES
153 #define CONFIG_USB_ANNOUNCE_NEW_DEVICES
157 #define USB_VENDOR_GENESYS_LOGIC 0x05e3
158 #define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01
160 #if defined(CONFIG_USBIF_COMPLIANCE) && defined(CONFIG_USB_XHCI_HCD)
161 extern int usbif_u3h_send_event(char* event
) ;
162 #include "otg_whitelist.h"
166 static inline int hub_is_superspeed(struct usb_device
*hdev
)
168 return (hdev
->descriptor
.bDeviceProtocol
== USB_HUB_PR_SS
);
171 /* Protect struct usb_device->state and ->children members
172 * Note: Both are also protected by ->dev.sem, except that ->state can
173 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
174 static DEFINE_SPINLOCK(device_state_lock
);
176 /* khubd's worklist and its lock */
177 static DEFINE_SPINLOCK(hub_event_lock
);
178 static LIST_HEAD(hub_event_list
); /* List of hubs needing servicing */
181 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait
);
183 static struct task_struct
*khubd_task
;
185 /* cycle leds on hubs that aren't blinking for attention */
186 static bool blinkenlights
= 0;
187 module_param (blinkenlights
, bool, S_IRUGO
);
188 MODULE_PARM_DESC (blinkenlights
, "true to cycle leds on hubs");
191 * Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about
192 * 10 seconds to send reply for the initial 64-byte descriptor request.
194 /* define initial 64-byte descriptor request timeout in milliseconds */
195 static int initial_descriptor_timeout
= USB_CTRL_GET_TIMEOUT
;
196 module_param(initial_descriptor_timeout
, int, S_IRUGO
|S_IWUSR
);
197 MODULE_PARM_DESC(initial_descriptor_timeout
,
198 "initial 64-byte descriptor request timeout in milliseconds "
199 "(default 5000 - 5.0 seconds)");
202 * As of 2.6.10 we introduce a new USB device initialization scheme which
203 * closely resembles the way Windows works. Hopefully it will be compatible
204 * with a wider range of devices than the old scheme. However some previously
205 * working devices may start giving rise to "device not accepting address"
206 * errors; if that happens the user can try the old scheme by adjusting the
207 * following module parameters.
209 * For maximum flexibility there are two boolean parameters to control the
210 * hub driver's behavior. On the first initialization attempt, if the
211 * "old_scheme_first" parameter is set then the old scheme will be used,
212 * otherwise the new scheme is used. If that fails and "use_both_schemes"
213 * is set, then the driver will make another attempt, using the other scheme.
215 static bool old_scheme_first
= 0;
216 module_param(old_scheme_first
, bool, S_IRUGO
| S_IWUSR
);
217 MODULE_PARM_DESC(old_scheme_first
,
218 "start with the old device initialization scheme");
220 static bool use_both_schemes
= 1;
221 module_param(use_both_schemes
, bool, S_IRUGO
| S_IWUSR
);
222 MODULE_PARM_DESC(use_both_schemes
,
223 "try the other device initialization scheme if the "
226 /* Mutual exclusion for EHCI CF initialization. This interferes with
227 * port reset on some companion controllers.
229 DECLARE_RWSEM(ehci_cf_port_reset_rwsem
);
230 EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem
);
232 #define HUB_DEBOUNCE_TIMEOUT 2000
233 #define HUB_DEBOUNCE_STEP 25
234 #define HUB_DEBOUNCE_STABLE 100
236 static void hub_release(struct kref
*kref
);
237 static int usb_reset_and_verify_device(struct usb_device
*udev
);
239 #define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
240 #define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
243 static inline char *portspeed(struct usb_hub
*hub
, int portstatus
)
245 if (hub_is_superspeed(hub
->hdev
))
247 if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
249 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
255 /* Note that hdev or one of its children must be locked! */
256 struct usb_hub
*usb_hub_to_struct_hub(struct usb_device
*hdev
)
258 if (!hdev
|| !hdev
->actconfig
|| !hdev
->maxchild
)
260 return usb_get_intfdata(hdev
->actconfig
->interface
[0]);
263 static int usb_device_supports_lpm(struct usb_device
*udev
)
265 /* Some devices have trouble with LPM */
266 if (udev
->quirks
& USB_QUIRK_NO_LPM
)
269 /* USB 2.1 (and greater) devices indicate LPM support through
270 * their USB 2.0 Extended Capabilities BOS descriptor.
272 if (udev
->speed
== USB_SPEED_HIGH
) {
273 if (udev
->bos
->ext_cap
&&
275 le32_to_cpu(udev
->bos
->ext_cap
->bmAttributes
)))
280 /* All USB 3.0 must support LPM, but we need their max exit latency
281 * information from the SuperSpeed Extended Capabilities BOS descriptor.
283 if (!udev
->bos
->ss_cap
) {
284 dev_warn(&udev
->dev
, "No LPM exit latency info found. "
285 "Power management will be impacted.\n");
288 if (udev
->parent
->lpm_capable
)
291 dev_warn(&udev
->dev
, "Parent hub missing LPM exit latency info. "
292 "Power management will be impacted.\n");
297 * Set the Maximum Exit Latency (MEL) for the host to initiate a transition from
300 static void usb_set_lpm_mel(struct usb_device
*udev
,
301 struct usb3_lpm_parameters
*udev_lpm_params
,
302 unsigned int udev_exit_latency
,
304 struct usb3_lpm_parameters
*hub_lpm_params
,
305 unsigned int hub_exit_latency
)
307 unsigned int total_mel
;
308 unsigned int device_mel
;
309 unsigned int hub_mel
;
312 * Calculate the time it takes to transition all links from the roothub
313 * to the parent hub into U0. The parent hub must then decode the
314 * packet (hub header decode latency) to figure out which port it was
317 * The Hub Header decode latency is expressed in 0.1us intervals (0x1
318 * means 0.1us). Multiply that by 100 to get nanoseconds.
320 total_mel
= hub_lpm_params
->mel
+
321 (hub
->descriptor
->u
.ss
.bHubHdrDecLat
* 100);
324 * How long will it take to transition the downstream hub's port into
325 * U0? The greater of either the hub exit latency or the device exit
328 * The BOS U1/U2 exit latencies are expressed in 1us intervals.
329 * Multiply that by 1000 to get nanoseconds.
331 device_mel
= udev_exit_latency
* 1000;
332 hub_mel
= hub_exit_latency
* 1000;
333 if (device_mel
> hub_mel
)
334 total_mel
+= device_mel
;
336 total_mel
+= hub_mel
;
338 udev_lpm_params
->mel
= total_mel
;
342 * Set the maximum Device to Host Exit Latency (PEL) for the device to initiate
343 * a transition from either U1 or U2.
345 static void usb_set_lpm_pel(struct usb_device
*udev
,
346 struct usb3_lpm_parameters
*udev_lpm_params
,
347 unsigned int udev_exit_latency
,
349 struct usb3_lpm_parameters
*hub_lpm_params
,
350 unsigned int hub_exit_latency
,
351 unsigned int port_to_port_exit_latency
)
353 unsigned int first_link_pel
;
354 unsigned int hub_pel
;
357 * First, the device sends an LFPS to transition the link between the
358 * device and the parent hub into U0. The exit latency is the bigger of
359 * the device exit latency or the hub exit latency.
361 if (udev_exit_latency
> hub_exit_latency
)
362 first_link_pel
= udev_exit_latency
* 1000;
364 first_link_pel
= hub_exit_latency
* 1000;
367 * When the hub starts to receive the LFPS, there is a slight delay for
368 * it to figure out that one of the ports is sending an LFPS. Then it
369 * will forward the LFPS to its upstream link. The exit latency is the
370 * delay, plus the PEL that we calculated for this hub.
372 hub_pel
= port_to_port_exit_latency
* 1000 + hub_lpm_params
->pel
;
375 * According to figure C-7 in the USB 3.0 spec, the PEL for this device
376 * is the greater of the two exit latencies.
378 if (first_link_pel
> hub_pel
)
379 udev_lpm_params
->pel
= first_link_pel
;
381 udev_lpm_params
->pel
= hub_pel
;
385 * Set the System Exit Latency (SEL) to indicate the total worst-case time from
386 * when a device initiates a transition to U0, until when it will receive the
387 * first packet from the host controller.
389 * Section C.1.5.1 describes the four components to this:
391 * - t2: time for the ERDY to make it from the device to the host.
392 * - t3: a host-specific delay to process the ERDY.
393 * - t4: time for the packet to make it from the host to the device.
395 * t3 is specific to both the xHCI host and the platform the host is integrated
396 * into. The Intel HW folks have said it's negligible, FIXME if a different
397 * vendor says otherwise.
399 static void usb_set_lpm_sel(struct usb_device
*udev
,
400 struct usb3_lpm_parameters
*udev_lpm_params
)
402 struct usb_device
*parent
;
403 unsigned int num_hubs
;
404 unsigned int total_sel
;
406 /* t1 = device PEL */
407 total_sel
= udev_lpm_params
->pel
;
408 /* How many external hubs are in between the device & the root port. */
409 for (parent
= udev
->parent
, num_hubs
= 0; parent
->parent
;
410 parent
= parent
->parent
)
412 /* t2 = 2.1us + 250ns * (num_hubs - 1) */
414 total_sel
+= 2100 + 250 * (num_hubs
- 1);
416 /* t4 = 250ns * num_hubs */
417 total_sel
+= 250 * num_hubs
;
419 udev_lpm_params
->sel
= total_sel
;
422 static void usb_set_lpm_parameters(struct usb_device
*udev
)
425 unsigned int port_to_port_delay
;
426 unsigned int udev_u1_del
;
427 unsigned int udev_u2_del
;
428 unsigned int hub_u1_del
;
429 unsigned int hub_u2_del
;
431 if (!udev
->lpm_capable
|| udev
->speed
!= USB_SPEED_SUPER
)
434 hub
= usb_hub_to_struct_hub(udev
->parent
);
435 /* It doesn't take time to transition the roothub into U0, since it
436 * doesn't have an upstream link.
441 udev_u1_del
= udev
->bos
->ss_cap
->bU1devExitLat
;
442 udev_u2_del
= udev
->bos
->ss_cap
->bU2DevExitLat
;
443 hub_u1_del
= udev
->parent
->bos
->ss_cap
->bU1devExitLat
;
444 hub_u2_del
= udev
->parent
->bos
->ss_cap
->bU2DevExitLat
;
446 usb_set_lpm_mel(udev
, &udev
->u1_params
, udev_u1_del
,
447 hub
, &udev
->parent
->u1_params
, hub_u1_del
);
449 usb_set_lpm_mel(udev
, &udev
->u2_params
, udev_u2_del
,
450 hub
, &udev
->parent
->u2_params
, hub_u2_del
);
453 * Appendix C, section C.2.2.2, says that there is a slight delay from
454 * when the parent hub notices the downstream port is trying to
455 * transition to U0 to when the hub initiates a U0 transition on its
456 * upstream port. The section says the delays are tPort2PortU1EL and
457 * tPort2PortU2EL, but it doesn't define what they are.
459 * The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking
460 * about the same delays. Use the maximum delay calculations from those
461 * sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For
462 * U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I
463 * assume the device exit latencies they are talking about are the hub
466 * What do we do if the U2 exit latency is less than the U1 exit
467 * latency? It's possible, although not likely...
469 port_to_port_delay
= 1;
471 usb_set_lpm_pel(udev
, &udev
->u1_params
, udev_u1_del
,
472 hub
, &udev
->parent
->u1_params
, hub_u1_del
,
475 if (hub_u2_del
> hub_u1_del
)
476 port_to_port_delay
= 1 + hub_u2_del
- hub_u1_del
;
478 port_to_port_delay
= 1 + hub_u1_del
;
480 usb_set_lpm_pel(udev
, &udev
->u2_params
, udev_u2_del
,
481 hub
, &udev
->parent
->u2_params
, hub_u2_del
,
484 /* Now that we've got PEL, calculate SEL. */
485 usb_set_lpm_sel(udev
, &udev
->u1_params
);
486 usb_set_lpm_sel(udev
, &udev
->u2_params
);
489 /* USB 2.0 spec Section 11.24.4.5 */
490 static int get_hub_descriptor(struct usb_device
*hdev
, void *data
)
495 if (hub_is_superspeed(hdev
)) {
496 dtype
= USB_DT_SS_HUB
;
497 size
= USB_DT_SS_HUB_SIZE
;
500 size
= sizeof(struct usb_hub_descriptor
);
503 for (i
= 0; i
< 3; i
++) {
504 ret
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
505 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
| USB_RT_HUB
,
506 dtype
<< 8, 0, data
, size
,
507 USB_CTRL_GET_TIMEOUT
);
508 if (ret
>= (USB_DT_HUB_NONVAR_SIZE
+ 2))
515 * USB 2.0 spec Section 11.24.2.1
517 static int clear_hub_feature(struct usb_device
*hdev
, int feature
)
519 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
520 USB_REQ_CLEAR_FEATURE
, USB_RT_HUB
, feature
, 0, NULL
, 0, 1000);
524 * USB 2.0 spec Section 11.24.2.2
526 int usb_clear_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
528 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
529 USB_REQ_CLEAR_FEATURE
, USB_RT_PORT
, feature
, port1
,
534 * USB 2.0 spec Section 11.24.2.13
536 static int set_port_feature(struct usb_device
*hdev
, int port1
, int feature
)
539 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
540 USB_REQ_SET_FEATURE
, USB_RT_PORT
, feature
, port1
,
545 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
546 * for info about using port indicators
548 static void set_port_led(
554 int status
= set_port_feature(hub
->hdev
, (selector
<< 8) | port1
,
555 USB_PORT_FEAT_INDICATOR
);
557 dev_dbg (hub
->intfdev
,
558 "port %d indicator %s status %d\n",
560 ({ char *s
; switch (selector
) {
561 case HUB_LED_AMBER
: s
= "amber"; break;
562 case HUB_LED_GREEN
: s
= "green"; break;
563 case HUB_LED_OFF
: s
= "off"; break;
564 case HUB_LED_AUTO
: s
= "auto"; break;
565 default: s
= "??"; break;
570 #define LED_CYCLE_PERIOD ((2*HZ)/3)
572 static void led_work (struct work_struct
*work
)
574 struct usb_hub
*hub
=
575 container_of(work
, struct usb_hub
, leds
.work
);
576 struct usb_device
*hdev
= hub
->hdev
;
578 unsigned changed
= 0;
581 if (hdev
->state
!= USB_STATE_CONFIGURED
|| hub
->quiescing
)
584 for (i
= 0; i
< hub
->descriptor
->bNbrPorts
; i
++) {
585 unsigned selector
, mode
;
587 /* 30%-50% duty cycle */
589 switch (hub
->indicator
[i
]) {
591 case INDICATOR_CYCLE
:
593 selector
= HUB_LED_AUTO
;
594 mode
= INDICATOR_AUTO
;
596 /* blinking green = sw attention */
597 case INDICATOR_GREEN_BLINK
:
598 selector
= HUB_LED_GREEN
;
599 mode
= INDICATOR_GREEN_BLINK_OFF
;
601 case INDICATOR_GREEN_BLINK_OFF
:
602 selector
= HUB_LED_OFF
;
603 mode
= INDICATOR_GREEN_BLINK
;
605 /* blinking amber = hw attention */
606 case INDICATOR_AMBER_BLINK
:
607 selector
= HUB_LED_AMBER
;
608 mode
= INDICATOR_AMBER_BLINK_OFF
;
610 case INDICATOR_AMBER_BLINK_OFF
:
611 selector
= HUB_LED_OFF
;
612 mode
= INDICATOR_AMBER_BLINK
;
614 /* blink green/amber = reserved */
615 case INDICATOR_ALT_BLINK
:
616 selector
= HUB_LED_GREEN
;
617 mode
= INDICATOR_ALT_BLINK_OFF
;
619 case INDICATOR_ALT_BLINK_OFF
:
620 selector
= HUB_LED_AMBER
;
621 mode
= INDICATOR_ALT_BLINK
;
626 if (selector
!= HUB_LED_AUTO
)
628 set_port_led(hub
, i
+ 1, selector
);
629 hub
->indicator
[i
] = mode
;
631 if (!changed
&& blinkenlights
) {
633 cursor
%= hub
->descriptor
->bNbrPorts
;
634 set_port_led(hub
, cursor
+ 1, HUB_LED_GREEN
);
635 hub
->indicator
[cursor
] = INDICATOR_CYCLE
;
639 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
642 /* use a short timeout for hub/port status fetches */
643 #define USB_STS_TIMEOUT 1000
644 #define USB_STS_RETRIES 5
647 * USB 2.0 spec Section 11.24.2.6
649 static int get_hub_status(struct usb_device
*hdev
,
650 struct usb_hub_status
*data
)
652 int i
, status
= -ETIMEDOUT
;
654 for (i
= 0; i
< USB_STS_RETRIES
&&
655 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
656 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
657 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_HUB
, 0, 0,
658 data
, sizeof(*data
), USB_STS_TIMEOUT
);
664 * USB 2.0 spec Section 11.24.2.7
666 static int get_port_status(struct usb_device
*hdev
, int port1
,
667 struct usb_port_status
*data
)
669 int i
, status
= -ETIMEDOUT
;
671 for (i
= 0; i
< USB_STS_RETRIES
&&
672 (status
== -ETIMEDOUT
|| status
== -EPIPE
); i
++) {
673 status
= usb_control_msg(hdev
, usb_rcvctrlpipe(hdev
, 0),
674 USB_REQ_GET_STATUS
, USB_DIR_IN
| USB_RT_PORT
, 0, port1
,
675 data
, sizeof(*data
), USB_STS_TIMEOUT
);
680 static int hub_port_status(struct usb_hub
*hub
, int port1
,
681 u16
*status
, u16
*change
)
685 mutex_lock(&hub
->status_mutex
);
686 ret
= get_port_status(hub
->hdev
, port1
, &hub
->status
->port
);
689 dev_err(hub
->intfdev
,
690 "%s failed (err = %d)\n", __func__
, ret
);
694 *status
= le16_to_cpu(hub
->status
->port
.wPortStatus
);
695 *change
= le16_to_cpu(hub
->status
->port
.wPortChange
);
699 mutex_unlock(&hub
->status_mutex
);
703 static void kick_khubd(struct usb_hub
*hub
)
707 spin_lock_irqsave(&hub_event_lock
, flags
);
708 if (!hub
->disconnected
&& list_empty(&hub
->event_list
)) {
709 list_add_tail(&hub
->event_list
, &hub_event_list
);
711 /* Suppress autosuspend until khubd runs */
712 usb_autopm_get_interface_no_resume(
713 to_usb_interface(hub
->intfdev
));
714 wake_up(&khubd_wait
);
716 spin_unlock_irqrestore(&hub_event_lock
, flags
);
719 void usb_kick_khubd(struct usb_device
*hdev
)
721 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
728 * Let the USB core know that a USB 3.0 device has sent a Function Wake Device
729 * Notification, which indicates it had initiated remote wakeup.
731 * USB 3.0 hubs do not report the port link state change from U3 to U0 when the
732 * device initiates resume, so the USB core will not receive notice of the
733 * resume through the normal hub interrupt URB.
735 void usb_wakeup_notification(struct usb_device
*hdev
,
736 unsigned int portnum
)
743 hub
= usb_hub_to_struct_hub(hdev
);
745 set_bit(portnum
, hub
->wakeup_bits
);
749 EXPORT_SYMBOL_GPL(usb_wakeup_notification
);
751 /* completion function, fires on port status changes and various faults */
752 static void hub_irq(struct urb
*urb
)
754 struct usb_hub
*hub
= urb
->context
;
755 int status
= urb
->status
;
760 case -ENOENT
: /* synchronous unlink */
761 case -ECONNRESET
: /* async unlink */
762 case -ESHUTDOWN
: /* hardware going away */
765 default: /* presumably an error */
766 /* Cause a hub reset after 10 consecutive errors */
767 dev_dbg (hub
->intfdev
, "transfer --> %d\n", status
);
768 if ((++hub
->nerrors
< 10) || hub
->error
)
773 /* let khubd handle things */
774 case 0: /* we got data: port status changed */
776 for (i
= 0; i
< urb
->actual_length
; ++i
)
777 bits
|= ((unsigned long) ((*hub
->buffer
)[i
]))
779 hub
->event_bits
[0] = bits
;
785 /* Something happened, let khubd figure it out */
792 if ((status
= usb_submit_urb (hub
->urb
, GFP_ATOMIC
)) != 0
793 && status
!= -ENODEV
&& status
!= -EPERM
)
794 dev_err (hub
->intfdev
, "resubmit --> %d\n", status
);
797 /* USB 2.0 spec Section 11.24.2.3 */
799 hub_clear_tt_buffer (struct usb_device
*hdev
, u16 devinfo
, u16 tt
)
801 /* Need to clear both directions for control ep */
802 if (((devinfo
>> 11) & USB_ENDPOINT_XFERTYPE_MASK
) ==
803 USB_ENDPOINT_XFER_CONTROL
) {
804 int status
= usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
805 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
,
806 devinfo
^ 0x8000, tt
, NULL
, 0, 1000);
810 return usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
811 HUB_CLEAR_TT_BUFFER
, USB_RT_PORT
, devinfo
,
816 * enumeration blocks khubd for a long time. we use keventd instead, since
817 * long blocking there is the exception, not the rule. accordingly, HCDs
818 * talking to TTs must queue control transfers (not just bulk and iso), so
819 * both can talk to the same hub concurrently.
821 static void hub_tt_work(struct work_struct
*work
)
823 struct usb_hub
*hub
=
824 container_of(work
, struct usb_hub
, tt
.clear_work
);
827 spin_lock_irqsave (&hub
->tt
.lock
, flags
);
828 while (!list_empty(&hub
->tt
.clear_list
)) {
829 struct list_head
*next
;
830 struct usb_tt_clear
*clear
;
831 struct usb_device
*hdev
= hub
->hdev
;
832 const struct hc_driver
*drv
;
835 next
= hub
->tt
.clear_list
.next
;
836 clear
= list_entry (next
, struct usb_tt_clear
, clear_list
);
837 list_del (&clear
->clear_list
);
839 /* drop lock so HCD can concurrently report other TT errors */
840 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
841 status
= hub_clear_tt_buffer (hdev
, clear
->devinfo
, clear
->tt
);
842 if (status
&& status
!= -ENODEV
)
844 "clear tt %d (%04x) error %d\n",
845 clear
->tt
, clear
->devinfo
, status
);
847 /* Tell the HCD, even if the operation failed */
848 drv
= clear
->hcd
->driver
;
849 if (drv
->clear_tt_buffer_complete
)
850 (drv
->clear_tt_buffer_complete
)(clear
->hcd
, clear
->ep
);
853 spin_lock_irqsave(&hub
->tt
.lock
, flags
);
855 spin_unlock_irqrestore (&hub
->tt
.lock
, flags
);
859 * usb_hub_set_port_power - control hub port's power state
862 * @set: expected status
864 * call this function to control port's power via setting or
865 * clearing the port's PORT_POWER feature.
867 int usb_hub_set_port_power(struct usb_device
*hdev
, int port1
,
871 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
872 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
875 ret
= set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
877 ret
= usb_clear_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
880 port_dev
->power_is_on
= set
;
885 * usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub
886 * @urb: an URB associated with the failed or incomplete split transaction
888 * High speed HCDs use this to tell the hub driver that some split control or
889 * bulk transaction failed in a way that requires clearing internal state of
890 * a transaction translator. This is normally detected (and reported) from
893 * It may not be possible for that hub to handle additional full (or low)
894 * speed transactions until that state is fully cleared out.
896 int usb_hub_clear_tt_buffer(struct urb
*urb
)
898 struct usb_device
*udev
= urb
->dev
;
899 int pipe
= urb
->pipe
;
900 struct usb_tt
*tt
= udev
->tt
;
902 struct usb_tt_clear
*clear
;
904 /* we've got to cope with an arbitrary number of pending TT clears,
905 * since each TT has "at least two" buffers that can need it (and
906 * there can be many TTs per hub). even if they're uncommon.
908 if ((clear
= kmalloc (sizeof *clear
, GFP_ATOMIC
)) == NULL
) {
909 dev_err (&udev
->dev
, "can't save CLEAR_TT_BUFFER state\n");
910 /* FIXME recover somehow ... RESET_TT? */
914 /* info that CLEAR_TT_BUFFER needs */
915 clear
->tt
= tt
->multi
? udev
->ttport
: 1;
916 clear
->devinfo
= usb_pipeendpoint (pipe
);
917 clear
->devinfo
|= udev
->devnum
<< 4;
918 clear
->devinfo
|= usb_pipecontrol (pipe
)
919 ? (USB_ENDPOINT_XFER_CONTROL
<< 11)
920 : (USB_ENDPOINT_XFER_BULK
<< 11);
921 if (usb_pipein (pipe
))
922 clear
->devinfo
|= 1 << 15;
924 /* info for completion callback */
925 clear
->hcd
= bus_to_hcd(udev
->bus
);
928 /* tell keventd to clear state for this TT */
929 spin_lock_irqsave (&tt
->lock
, flags
);
930 list_add_tail (&clear
->clear_list
, &tt
->clear_list
);
931 schedule_work(&tt
->clear_work
);
932 spin_unlock_irqrestore (&tt
->lock
, flags
);
935 EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer
);
937 /* If do_delay is false, return the number of milliseconds the caller
940 static unsigned hub_power_on(struct usb_hub
*hub
, bool do_delay
)
943 unsigned pgood_delay
= hub
->descriptor
->bPwrOn2PwrGood
* 2;
945 u16 wHubCharacteristics
=
946 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
948 /* Enable power on each port. Some hubs have reserved values
949 * of LPSM (> 2) in their descriptors, even though they are
950 * USB 2.0 hubs. Some hubs do not implement port-power switching
951 * but only emulate it. In all cases, the ports won't work
952 * unless we send these messages to the hub.
954 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2)
955 dev_dbg(hub
->intfdev
, "enabling power on all ports\n");
957 dev_dbg(hub
->intfdev
, "trying to enable port power on "
958 "non-switchable hub\n");
959 for (port1
= 1; port1
<= hub
->descriptor
->bNbrPorts
; port1
++)
960 if (hub
->ports
[port1
- 1]->power_is_on
)
961 set_port_feature(hub
->hdev
, port1
, USB_PORT_FEAT_POWER
);
963 usb_clear_port_feature(hub
->hdev
, port1
,
964 USB_PORT_FEAT_POWER
);
966 /* Wait at least 100 msec for power to become stable */
967 delay
= max(pgood_delay
, (unsigned) 100);
973 static int hub_hub_status(struct usb_hub
*hub
,
974 u16
*status
, u16
*change
)
978 mutex_lock(&hub
->status_mutex
);
979 ret
= get_hub_status(hub
->hdev
, &hub
->status
->hub
);
982 dev_err(hub
->intfdev
,
983 "%s failed (err = %d)\n", __func__
, ret
);
985 *status
= le16_to_cpu(hub
->status
->hub
.wHubStatus
);
986 *change
= le16_to_cpu(hub
->status
->hub
.wHubChange
);
989 mutex_unlock(&hub
->status_mutex
);
993 static int hub_set_port_link_state(struct usb_hub
*hub
, int port1
,
994 unsigned int link_status
)
996 return set_port_feature(hub
->hdev
,
997 port1
| (link_status
<< 3),
998 USB_PORT_FEAT_LINK_STATE
);
1002 * If USB 3.0 ports are placed into the Disabled state, they will no longer
1003 * detect any device connects or disconnects. This is generally not what the
1004 * USB core wants, since it expects a disabled port to produce a port status
1005 * change event when a new device connects.
1007 * Instead, set the link state to Disabled, wait for the link to settle into
1008 * that state, clear any change bits, and then put the port into the RxDetect
1011 static int hub_usb3_port_disable(struct usb_hub
*hub
, int port1
)
1015 u16 portchange
, portstatus
;
1017 if (!hub_is_superspeed(hub
->hdev
))
1020 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1025 * USB controller Advanced Micro Devices, Inc. [AMD] FCH USB XHCI
1026 * Controller [1022:7814] will have spurious result making the following
1027 * usb 3.0 device hotplugging route to the 2.0 root hub and recognized
1028 * as high-speed device if we set the usb 3.0 port link state to
1029 * Disabled. Since it's already in USB_SS_PORT_LS_RX_DETECT state, we
1030 * check the state here to avoid the bug.
1032 if ((portstatus
& USB_PORT_STAT_LINK_STATE
) ==
1033 USB_SS_PORT_LS_RX_DETECT
) {
1034 dev_dbg(&hub
->ports
[port1
- 1]->dev
,
1035 "Not disabling port; link state is RxDetect\n");
1039 ret
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_SS_DISABLED
);
1043 /* Wait for the link to enter the disabled state. */
1044 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
1045 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1049 if ((portstatus
& USB_PORT_STAT_LINK_STATE
) ==
1050 USB_SS_PORT_LS_SS_DISABLED
)
1052 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
1054 msleep(HUB_DEBOUNCE_STEP
);
1056 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
1057 dev_warn(hub
->intfdev
, "Could not disable port %d after %d ms\n",
1060 return hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_RX_DETECT
);
1063 static int hub_port_disable(struct usb_hub
*hub
, int port1
, int set_state
)
1065 struct usb_device
*hdev
= hub
->hdev
;
1068 if (hub
->ports
[port1
- 1]->child
&& set_state
)
1069 usb_set_device_state(hub
->ports
[port1
- 1]->child
,
1070 USB_STATE_NOTATTACHED
);
1072 if (hub_is_superspeed(hub
->hdev
))
1073 ret
= hub_usb3_port_disable(hub
, port1
);
1075 ret
= usb_clear_port_feature(hdev
, port1
,
1076 USB_PORT_FEAT_ENABLE
);
1078 if (ret
&& ret
!= -ENODEV
)
1079 dev_err(hub
->intfdev
, "cannot disable port %d (err = %d)\n",
1085 * Disable a port and mark a logical connect-change event, so that some
1086 * time later khubd will disconnect() any existing usb_device on the port
1087 * and will re-enumerate if there actually is a device attached.
1089 static void hub_port_logical_disconnect(struct usb_hub
*hub
, int port1
)
1091 dev_dbg(hub
->intfdev
, "logical disconnect on port %d\n", port1
);
1092 hub_port_disable(hub
, port1
, 1);
1094 /* FIXME let caller ask to power down the port:
1095 * - some devices won't enumerate without a VBUS power cycle
1096 * - SRP saves power that way
1097 * - ... new call, TBD ...
1098 * That's easy if this hub can switch power per-port, and
1099 * khubd reactivates the port later (timer, SRP, etc).
1100 * Powerdown must be optional, because of reset/DFU.
1103 set_bit(port1
, hub
->change_bits
);
1108 * usb_remove_device - disable a device's port on its parent hub
1109 * @udev: device to be disabled and removed
1110 * Context: @udev locked, must be able to sleep.
1112 * After @udev's port has been disabled, khubd is notified and it will
1113 * see that the device has been disconnected. When the device is
1114 * physically unplugged and something is plugged in, the events will
1115 * be received and processed normally.
1117 int usb_remove_device(struct usb_device
*udev
)
1119 struct usb_hub
*hub
;
1120 struct usb_interface
*intf
;
1122 if (!udev
->parent
) /* Can't remove a root hub */
1124 hub
= usb_hub_to_struct_hub(udev
->parent
);
1125 intf
= to_usb_interface(hub
->intfdev
);
1127 usb_autopm_get_interface(intf
);
1128 set_bit(udev
->portnum
, hub
->removed_bits
);
1129 hub_port_logical_disconnect(hub
, udev
->portnum
);
1130 usb_autopm_put_interface(intf
);
1134 enum hub_activation_type
{
1135 HUB_INIT
, HUB_INIT2
, HUB_INIT3
, /* INITs must come first */
1136 HUB_POST_RESET
, HUB_RESUME
, HUB_RESET_RESUME
,
1139 static void hub_init_func2(struct work_struct
*ws
);
1140 static void hub_init_func3(struct work_struct
*ws
);
1142 static void hub_activate(struct usb_hub
*hub
, enum hub_activation_type type
)
1144 struct usb_device
*hdev
= hub
->hdev
;
1145 struct usb_hcd
*hcd
;
1149 bool need_debounce_delay
= false;
1152 /* Continue a partial initialization */
1153 if (type
== HUB_INIT2
|| type
== HUB_INIT3
) {
1154 device_lock(hub
->intfdev
);
1156 /* Was the hub disconnected while we were waiting? */
1157 if (hub
->disconnected
) {
1158 device_unlock(hub
->intfdev
);
1159 kref_put(&hub
->kref
, hub_release
);
1162 if (type
== HUB_INIT2
)
1166 kref_get(&hub
->kref
);
1168 /* The superspeed hub except for root hub has to use Hub Depth
1169 * value as an offset into the route string to locate the bits
1170 * it uses to determine the downstream port number. So hub driver
1171 * should send a set hub depth request to superspeed hub after
1172 * the superspeed hub is set configuration in initialization or
1175 * After a resume, port power should still be on.
1176 * For any other type of activation, turn it on.
1178 if (type
!= HUB_RESUME
) {
1179 if (hdev
->parent
&& hub_is_superspeed(hdev
)) {
1180 ret
= usb_control_msg(hdev
, usb_sndctrlpipe(hdev
, 0),
1181 HUB_SET_DEPTH
, USB_RT_HUB
,
1182 hdev
->level
- 1, 0, NULL
, 0,
1183 USB_CTRL_SET_TIMEOUT
);
1185 dev_err(hub
->intfdev
,
1186 "set hub depth failed\n");
1189 /* Speed up system boot by using a delayed_work for the
1190 * hub's initial power-up delays. This is pretty awkward
1191 * and the implementation looks like a home-brewed sort of
1192 * setjmp/longjmp, but it saves at least 100 ms for each
1193 * root hub (assuming usbcore is compiled into the kernel
1194 * rather than as a module). It adds up.
1196 * This can't be done for HUB_RESUME or HUB_RESET_RESUME
1197 * because for those activation types the ports have to be
1198 * operational when we return. In theory this could be done
1199 * for HUB_POST_RESET, but it's easier not to.
1201 if (type
== HUB_INIT
) {
1202 delay
= hub_power_on(hub
, false);
1203 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func2
);
1204 schedule_delayed_work(&hub
->init_work
,
1205 msecs_to_jiffies(delay
));
1207 /* Suppress autosuspend until init is done */
1208 usb_autopm_get_interface_no_resume(
1209 to_usb_interface(hub
->intfdev
));
1210 return; /* Continues at init2: below */
1211 } else if (type
== HUB_RESET_RESUME
) {
1212 /* The internal host controller state for the hub device
1213 * may be gone after a host power loss on system resume.
1214 * Update the device's info so the HW knows it's a hub.
1216 hcd
= bus_to_hcd(hdev
->bus
);
1217 if (hcd
->driver
->update_hub_device
) {
1218 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1219 &hub
->tt
, GFP_NOIO
);
1221 dev_err(hub
->intfdev
, "Host not "
1222 "accepting hub info "
1224 dev_err(hub
->intfdev
, "LS/FS devices "
1225 "and hubs may not work "
1226 "under this hub\n.");
1229 hub_power_on(hub
, true);
1231 hub_power_on(hub
, true);
1236 /* Check each port and set hub->change_bits to let khubd know
1237 * which ports need attention.
1239 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
1240 struct usb_device
*udev
= hub
->ports
[port1
- 1]->child
;
1241 u16 portstatus
, portchange
;
1243 portstatus
= portchange
= 0;
1244 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
1245 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
))
1246 dev_dbg(hub
->intfdev
,
1247 "port %d: status %04x change %04x\n",
1248 port1
, portstatus
, portchange
);
1250 /* After anything other than HUB_RESUME (i.e., initialization
1251 * or any sort of reset), every port should be disabled.
1252 * Unconnected ports should likewise be disabled (paranoia),
1253 * and so should ports for which we have no usb_device.
1255 if ((portstatus
& USB_PORT_STAT_ENABLE
) && (
1256 type
!= HUB_RESUME
||
1257 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
1259 udev
->state
== USB_STATE_NOTATTACHED
)) {
1261 * USB3 protocol ports will automatically transition
1262 * to Enabled state when detect an USB3.0 device attach.
1263 * Do not disable USB3 protocol ports.
1265 if (!hub_is_superspeed(hdev
)) {
1266 usb_clear_port_feature(hdev
, port1
,
1267 USB_PORT_FEAT_ENABLE
);
1268 portstatus
&= ~USB_PORT_STAT_ENABLE
;
1270 /* Pretend that power was lost for USB3 devs */
1271 portstatus
&= ~USB_PORT_STAT_ENABLE
;
1275 /* Clear status-change flags; we'll debounce later */
1276 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
1277 need_debounce_delay
= true;
1278 usb_clear_port_feature(hub
->hdev
, port1
,
1279 USB_PORT_FEAT_C_CONNECTION
);
1281 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
1282 need_debounce_delay
= true;
1283 usb_clear_port_feature(hub
->hdev
, port1
,
1284 USB_PORT_FEAT_C_ENABLE
);
1286 if (portchange
& USB_PORT_STAT_C_RESET
) {
1287 need_debounce_delay
= true;
1288 usb_clear_port_feature(hub
->hdev
, port1
,
1289 USB_PORT_FEAT_C_RESET
);
1291 if ((portchange
& USB_PORT_STAT_C_BH_RESET
) &&
1292 hub_is_superspeed(hub
->hdev
)) {
1293 need_debounce_delay
= true;
1294 usb_clear_port_feature(hub
->hdev
, port1
,
1295 USB_PORT_FEAT_C_BH_PORT_RESET
);
1297 /* We can forget about a "removed" device when there's a
1298 * physical disconnect or the connect status changes.
1300 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
1301 (portchange
& USB_PORT_STAT_C_CONNECTION
))
1302 clear_bit(port1
, hub
->removed_bits
);
1304 if (!udev
|| udev
->state
== USB_STATE_NOTATTACHED
) {
1305 /* Tell khubd to disconnect the device or
1306 * check for a new connection
1308 if (udev
|| (portstatus
& USB_PORT_STAT_CONNECTION
) ||
1309 (portstatus
& USB_PORT_STAT_OVERCURRENT
))
1310 set_bit(port1
, hub
->change_bits
);
1312 } else if (portstatus
& USB_PORT_STAT_ENABLE
) {
1313 bool port_resumed
= (portstatus
&
1314 USB_PORT_STAT_LINK_STATE
) ==
1316 /* The power session apparently survived the resume.
1317 * If there was an overcurrent or suspend change
1318 * (i.e., remote wakeup request), have khubd
1319 * take care of it. Look at the port link state
1320 * for USB 3.0 hubs, since they don't have a suspend
1321 * change bit, and they don't set the port link change
1322 * bit on device-initiated resume.
1324 if (portchange
|| (hub_is_superspeed(hub
->hdev
) &&
1326 set_bit(port1
, hub
->change_bits
);
1328 } else if (udev
->persist_enabled
) {
1329 struct usb_port
*port_dev
= hub
->ports
[port1
- 1];
1332 udev
->reset_resume
= 1;
1334 /* Don't set the change_bits when the device
1337 if (port_dev
->power_is_on
)
1338 set_bit(port1
, hub
->change_bits
);
1341 /* The power session is gone; tell khubd */
1342 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
1343 set_bit(port1
, hub
->change_bits
);
1347 /* If no port-status-change flags were set, we don't need any
1348 * debouncing. If flags were set we can try to debounce the
1349 * ports all at once right now, instead of letting khubd do them
1350 * one at a time later on.
1352 * If any port-status changes do occur during this delay, khubd
1353 * will see them later and handle them normally.
1355 if (need_debounce_delay
) {
1356 delay
= HUB_DEBOUNCE_STABLE
;
1358 /* Don't do a long sleep inside a workqueue routine */
1359 if (type
== HUB_INIT2
) {
1360 PREPARE_DELAYED_WORK(&hub
->init_work
, hub_init_func3
);
1361 schedule_delayed_work(&hub
->init_work
,
1362 msecs_to_jiffies(delay
));
1363 device_unlock(hub
->intfdev
);
1364 return; /* Continues at init3: below */
1372 status
= usb_submit_urb(hub
->urb
, GFP_NOIO
);
1374 dev_err(hub
->intfdev
, "activate --> %d\n", status
);
1375 if (hub
->has_indicators
&& blinkenlights
)
1376 schedule_delayed_work(&hub
->leds
, LED_CYCLE_PERIOD
);
1378 /* Scan all ports that need attention */
1381 /* Allow autosuspend if it was suppressed */
1382 if (type
<= HUB_INIT3
)
1383 usb_autopm_put_interface_async(to_usb_interface(hub
->intfdev
));
1385 if (type
== HUB_INIT2
|| type
== HUB_INIT3
)
1386 device_unlock(hub
->intfdev
);
1388 kref_put(&hub
->kref
, hub_release
);
1391 /* Implement the continuations for the delays above */
1392 static void hub_init_func2(struct work_struct
*ws
)
1394 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
1396 hub_activate(hub
, HUB_INIT2
);
1399 static void hub_init_func3(struct work_struct
*ws
)
1401 struct usb_hub
*hub
= container_of(ws
, struct usb_hub
, init_work
.work
);
1403 hub_activate(hub
, HUB_INIT3
);
1406 enum hub_quiescing_type
{
1407 HUB_DISCONNECT
, HUB_PRE_RESET
, HUB_SUSPEND
1410 static void hub_quiesce(struct usb_hub
*hub
, enum hub_quiescing_type type
)
1412 struct usb_device
*hdev
= hub
->hdev
;
1415 cancel_delayed_work_sync(&hub
->init_work
);
1417 /* khubd and related activity won't re-trigger */
1420 if (type
!= HUB_SUSPEND
) {
1421 /* Disconnect all the children */
1422 for (i
= 0; i
< hdev
->maxchild
; ++i
) {
1423 if (hub
->ports
[i
]->child
)
1424 usb_disconnect(&hub
->ports
[i
]->child
);
1428 /* Stop khubd and related activity */
1429 usb_kill_urb(hub
->urb
);
1430 if (hub
->has_indicators
)
1431 cancel_delayed_work_sync(&hub
->leds
);
1433 flush_work(&hub
->tt
.clear_work
);
1436 /* caller has locked the hub device */
1437 static int hub_pre_reset(struct usb_interface
*intf
)
1439 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1441 hub_quiesce(hub
, HUB_PRE_RESET
);
1445 /* caller has locked the hub device */
1446 static int hub_post_reset(struct usb_interface
*intf
)
1448 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1450 hub_activate(hub
, HUB_POST_RESET
);
1454 static int hub_configure(struct usb_hub
*hub
,
1455 struct usb_endpoint_descriptor
*endpoint
)
1457 struct usb_hcd
*hcd
;
1458 struct usb_device
*hdev
= hub
->hdev
;
1459 struct device
*hub_dev
= hub
->intfdev
;
1460 u16 hubstatus
, hubchange
;
1461 u16 wHubCharacteristics
;
1464 char *message
= "out of memory";
1468 hub
->buffer
= kmalloc(sizeof(*hub
->buffer
), GFP_KERNEL
);
1474 hub
->status
= kmalloc(sizeof(*hub
->status
), GFP_KERNEL
);
1479 mutex_init(&hub
->status_mutex
);
1481 hub
->descriptor
= kmalloc(sizeof(*hub
->descriptor
), GFP_KERNEL
);
1482 if (!hub
->descriptor
) {
1487 /* Request the entire hub descriptor.
1488 * hub->descriptor can handle USB_MAXCHILDREN ports,
1489 * but the hub can/will return fewer bytes here.
1491 ret
= get_hub_descriptor(hdev
, hub
->descriptor
);
1493 message
= "can't read hub descriptor";
1495 } else if (hub
->descriptor
->bNbrPorts
> USB_MAXCHILDREN
) {
1496 message
= "hub has too many ports!";
1499 } else if (hub
->descriptor
->bNbrPorts
== 0) {
1500 message
= "hub doesn't have any ports!";
1505 hdev
->maxchild
= hub
->descriptor
->bNbrPorts
;
1506 dev_info (hub_dev
, "%d port%s detected\n", hdev
->maxchild
,
1507 (hdev
->maxchild
== 1) ? "" : "s");
1509 hub
->ports
= kzalloc(hdev
->maxchild
* sizeof(struct usb_port
*),
1516 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
1517 if (hub_is_superspeed(hdev
)) {
1525 /* FIXME for USB 3.0, skip for now */
1526 if ((wHubCharacteristics
& HUB_CHAR_COMPOUND
) &&
1527 !(hub_is_superspeed(hdev
))) {
1529 char portstr
[USB_MAXCHILDREN
+ 1];
1531 for (i
= 0; i
< hdev
->maxchild
; i
++)
1532 portstr
[i
] = hub
->descriptor
->u
.hs
.DeviceRemovable
1533 [((i
+ 1) / 8)] & (1 << ((i
+ 1) % 8))
1535 portstr
[hdev
->maxchild
] = 0;
1536 dev_dbg(hub_dev
, "compound device; port removable status: %s\n", portstr
);
1538 dev_dbg(hub_dev
, "standalone hub\n");
1540 switch (wHubCharacteristics
& HUB_CHAR_LPSM
) {
1541 case HUB_CHAR_COMMON_LPSM
:
1542 dev_dbg(hub_dev
, "ganged power switching\n");
1544 case HUB_CHAR_INDV_PORT_LPSM
:
1545 dev_dbg(hub_dev
, "individual port power switching\n");
1547 case HUB_CHAR_NO_LPSM
:
1549 dev_dbg(hub_dev
, "no power switching (usb 1.0)\n");
1553 switch (wHubCharacteristics
& HUB_CHAR_OCPM
) {
1554 case HUB_CHAR_COMMON_OCPM
:
1555 dev_dbg(hub_dev
, "global over-current protection\n");
1557 case HUB_CHAR_INDV_PORT_OCPM
:
1558 dev_dbg(hub_dev
, "individual port over-current protection\n");
1560 case HUB_CHAR_NO_OCPM
:
1562 dev_dbg(hub_dev
, "no over-current protection\n");
1566 spin_lock_init (&hub
->tt
.lock
);
1567 INIT_LIST_HEAD (&hub
->tt
.clear_list
);
1568 INIT_WORK(&hub
->tt
.clear_work
, hub_tt_work
);
1569 switch (hdev
->descriptor
.bDeviceProtocol
) {
1572 case USB_HUB_PR_HS_SINGLE_TT
:
1573 dev_dbg(hub_dev
, "Single TT\n");
1576 case USB_HUB_PR_HS_MULTI_TT
:
1577 ret
= usb_set_interface(hdev
, 0, 1);
1579 dev_dbg(hub_dev
, "TT per port\n");
1582 dev_err(hub_dev
, "Using single TT (err %d)\n",
1587 /* USB 3.0 hubs don't have a TT */
1590 dev_dbg(hub_dev
, "Unrecognized hub protocol %d\n",
1591 hdev
->descriptor
.bDeviceProtocol
);
1595 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
1596 switch (wHubCharacteristics
& HUB_CHAR_TTTT
) {
1597 case HUB_TTTT_8_BITS
:
1598 if (hdev
->descriptor
.bDeviceProtocol
!= 0) {
1599 hub
->tt
.think_time
= 666;
1600 dev_dbg(hub_dev
, "TT requires at most %d "
1601 "FS bit times (%d ns)\n",
1602 8, hub
->tt
.think_time
);
1605 case HUB_TTTT_16_BITS
:
1606 hub
->tt
.think_time
= 666 * 2;
1607 dev_dbg(hub_dev
, "TT requires at most %d "
1608 "FS bit times (%d ns)\n",
1609 16, hub
->tt
.think_time
);
1611 case HUB_TTTT_24_BITS
:
1612 hub
->tt
.think_time
= 666 * 3;
1613 dev_dbg(hub_dev
, "TT requires at most %d "
1614 "FS bit times (%d ns)\n",
1615 24, hub
->tt
.think_time
);
1617 case HUB_TTTT_32_BITS
:
1618 hub
->tt
.think_time
= 666 * 4;
1619 dev_dbg(hub_dev
, "TT requires at most %d "
1620 "FS bit times (%d ns)\n",
1621 32, hub
->tt
.think_time
);
1625 /* probe() zeroes hub->indicator[] */
1626 if (wHubCharacteristics
& HUB_CHAR_PORTIND
) {
1627 hub
->has_indicators
= 1;
1628 dev_dbg(hub_dev
, "Port indicators are supported\n");
1631 dev_dbg(hub_dev
, "power on to power good time: %dms\n",
1632 hub
->descriptor
->bPwrOn2PwrGood
* 2);
1634 /* power budgeting mostly matters with bus-powered hubs,
1635 * and battery-powered root hubs (may provide just 8 mA).
1637 ret
= usb_get_status(hdev
, USB_RECIP_DEVICE
, 0, &hubstatus
);
1639 message
= "can't get hub status";
1642 le16_to_cpus(&hubstatus
);
1643 hcd
= bus_to_hcd(hdev
->bus
);
1644 if (hdev
== hdev
->bus
->root_hub
) {
1645 if (hcd
->power_budget
> 0)
1646 hdev
->bus_mA
= hcd
->power_budget
;
1648 hdev
->bus_mA
= full_load
* hdev
->maxchild
;
1649 if (hdev
->bus_mA
>= full_load
)
1650 hub
->mA_per_port
= full_load
;
1652 hub
->mA_per_port
= hdev
->bus_mA
;
1653 hub
->limited_power
= 1;
1655 } else if ((hubstatus
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) { // bus powered
1656 int remaining
= hdev
->bus_mA
-
1657 hub
->descriptor
->bHubContrCurrent
;
1659 dev_dbg(hub_dev
, "hub controller current requirement: %dmA\n",
1660 hub
->descriptor
->bHubContrCurrent
);
1661 hub
->limited_power
= 1;
1663 if (remaining
< hdev
->maxchild
* unit_load
){
1664 #if defined(CONFIG_USBIF_COMPLIANCE) && defined(CONFIG_USB_XHCI_HCD)
1665 usbif_u3h_send_event("DEV_OVER_CURRENT");
1668 "insufficient power available "
1669 "to use all downstream ports\n");
1671 hub
->mA_per_port
= unit_load
; /* 7.2.1 */
1673 } else { /* Self-powered external hub */
1674 /* FIXME: What about battery-powered external hubs that
1675 * provide less current per port? */
1676 hub
->mA_per_port
= full_load
;
1678 if (hub
->mA_per_port
< full_load
)
1679 dev_dbg(hub_dev
, "%umA bus power budget for each child\n",
1682 /* Update the HCD's internal representation of this hub before khubd
1683 * starts getting port status changes for devices under the hub.
1685 if (hcd
->driver
->update_hub_device
) {
1686 ret
= hcd
->driver
->update_hub_device(hcd
, hdev
,
1687 &hub
->tt
, GFP_KERNEL
);
1689 message
= "can't update HCD hub info";
1694 ret
= hub_hub_status(hub
, &hubstatus
, &hubchange
);
1696 message
= "can't get hub status";
1700 /* local power status reports aren't always correct */
1701 if (hdev
->actconfig
->desc
.bmAttributes
& USB_CONFIG_ATT_SELFPOWER
)
1702 dev_dbg(hub_dev
, "local power source is %s\n",
1703 (hubstatus
& HUB_STATUS_LOCAL_POWER
)
1704 ? "lost (inactive)" : "good");
1706 if ((wHubCharacteristics
& HUB_CHAR_OCPM
) == 0)
1707 dev_dbg(hub_dev
, "%sover-current condition exists\n",
1708 (hubstatus
& HUB_STATUS_OVERCURRENT
) ? "" : "no ");
1710 /* set up the interrupt endpoint
1711 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
1712 * bytes as USB2.0[11.12.3] says because some hubs are known
1713 * to send more data (and thus cause overflow). For root hubs,
1714 * maxpktsize is defined in hcd.c's fake endpoint descriptors
1715 * to be big enough for at least USB_MAXCHILDREN ports. */
1716 pipe
= usb_rcvintpipe(hdev
, endpoint
->bEndpointAddress
);
1717 maxp
= usb_maxpacket(hdev
, pipe
, usb_pipeout(pipe
));
1719 if (maxp
> sizeof(*hub
->buffer
))
1720 maxp
= sizeof(*hub
->buffer
);
1722 hub
->urb
= usb_alloc_urb(0, GFP_KERNEL
);
1728 usb_fill_int_urb(hub
->urb
, hdev
, pipe
, *hub
->buffer
, maxp
, hub_irq
,
1729 hub
, endpoint
->bInterval
);
1731 /* maybe cycle the hub leds */
1732 if (hub
->has_indicators
&& blinkenlights
)
1733 hub
->indicator
[0] = INDICATOR_CYCLE
;
1735 for (i
= 0; i
< hdev
->maxchild
; i
++) {
1736 ret
= usb_hub_create_port_device(hub
, i
+ 1);
1738 dev_err(hub
->intfdev
,
1739 "couldn't create port%d device.\n", i
+ 1);
1741 goto fail_keep_maxchild
;
1745 usb_hub_adjust_deviceremovable(hdev
, hub
->descriptor
);
1747 hub_activate(hub
, HUB_INIT
);
1753 dev_err (hub_dev
, "config failed, %s (err %d)\n",
1755 /* hub_disconnect() frees urb and descriptor */
1759 static void hub_release(struct kref
*kref
)
1761 struct usb_hub
*hub
= container_of(kref
, struct usb_hub
, kref
);
1763 usb_put_intf(to_usb_interface(hub
->intfdev
));
1767 static unsigned highspeed_hubs
;
1769 static void hub_disconnect(struct usb_interface
*intf
)
1771 struct usb_hub
*hub
= usb_get_intfdata(intf
);
1772 struct usb_device
*hdev
= interface_to_usbdev(intf
);
1775 /* Take the hub off the event list and don't let it be added again */
1776 spin_lock_irq(&hub_event_lock
);
1777 if (!list_empty(&hub
->event_list
)) {
1778 list_del_init(&hub
->event_list
);
1779 usb_autopm_put_interface_no_suspend(intf
);
1781 hub
->disconnected
= 1;
1782 spin_unlock_irq(&hub_event_lock
);
1784 /* Disconnect all children and quiesce the hub */
1786 hub_quiesce(hub
, HUB_DISCONNECT
);
1788 /* Avoid races with recursively_mark_NOTATTACHED() */
1789 spin_lock_irq(&device_state_lock
);
1790 port1
= hdev
->maxchild
;
1792 usb_set_intfdata(intf
, NULL
);
1793 spin_unlock_irq(&device_state_lock
);
1795 for (; port1
> 0; --port1
)
1796 usb_hub_remove_port_device(hub
, port1
);
1798 if (hub
->hdev
->speed
== USB_SPEED_HIGH
)
1801 usb_free_urb(hub
->urb
);
1803 kfree(hub
->descriptor
);
1807 pm_suspend_ignore_children(&intf
->dev
, false);
1808 kref_put(&hub
->kref
, hub_release
);
1811 static int hub_probe(struct usb_interface
*intf
, const struct usb_device_id
*id
)
1813 struct usb_host_interface
*desc
;
1814 struct usb_endpoint_descriptor
*endpoint
;
1815 struct usb_device
*hdev
;
1816 struct usb_hub
*hub
;
1819 desc
= intf
->cur_altsetting
;
1820 hdev
= interface_to_usbdev(intf
);
1823 * Set default autosuspend delay as 0 to speedup bus suspend,
1824 * based on the below considerations:
1826 * - Unlike other drivers, the hub driver does not rely on the
1827 * autosuspend delay to provide enough time to handle a wakeup
1828 * event, and the submitted status URB is just to check future
1829 * change on hub downstream ports, so it is safe to do it.
1831 * - The patch might cause one or more auto supend/resume for
1832 * below very rare devices when they are plugged into hub
1835 * devices having trouble initializing, and disconnect
1836 * themselves from the bus and then reconnect a second
1839 * devices just for downloading firmware, and disconnects
1840 * themselves after completing it
1842 * For these quite rare devices, their drivers may change the
1843 * autosuspend delay of their parent hub in the probe() to one
1844 * appropriate value to avoid the subtle problem if someone
1847 * - The patch may cause one or more auto suspend/resume on
1848 * hub during running 'lsusb', but it is probably too
1849 * infrequent to worry about.
1851 * - Change autosuspend delay of hub can avoid unnecessary auto
1852 * suspend timer for hub, also may decrease power consumption
1855 * - If user has indicated to prevent autosuspend by passing
1856 * usbcore.autosuspend = -1 then keep autosuspend disabled.
1858 #ifdef CONFIG_PM_RUNTIME
1859 if (hdev
->dev
.power
.autosuspend_delay
>= 0)
1860 pm_runtime_set_autosuspend_delay(&hdev
->dev
, 0);
1864 * Hubs have proper suspend/resume support, except for root hubs
1865 * where the controller driver doesn't have bus_suspend and
1866 * bus_resume methods.
1868 if (hdev
->parent
) { /* normal device */
1869 usb_enable_autosuspend(hdev
);
1870 } else { /* root hub */
1871 const struct hc_driver
*drv
= bus_to_hcd(hdev
->bus
)->driver
;
1873 if (drv
->bus_suspend
&& drv
->bus_resume
)
1874 usb_enable_autosuspend(hdev
);
1877 if (hdev
->level
== MAX_TOPO_LEVEL
) {
1879 "Unsupported bus topology: hub nested too deep\n");
1880 #if defined(CONFIG_USBIF_COMPLIANCE) && defined(CONFIG_USB_XHCI_HCD)
1881 usbif_u3h_send_event("MAX_HUB_TIER_EXCEED");
1886 #ifdef CONFIG_USB_OTG_BLACKLIST_HUB
1888 dev_warn(&intf
->dev
, "ignoring external hub\n");
1889 #if defined(CONFIG_USBIF_COMPLIANCE) && defined(CONFIG_USB_XHCI_HCD)
1890 usbif_u3h_send_event("HUB_NOT_SUPPORTED");
1896 /* Some hubs have a subclass of 1, which AFAICT according to the */
1897 /* specs is not defined, but it works */
1898 if ((desc
->desc
.bInterfaceSubClass
!= 0) &&
1899 (desc
->desc
.bInterfaceSubClass
!= 1)) {
1901 dev_err (&intf
->dev
, "bad descriptor, ignoring hub\n");
1905 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
1906 if (desc
->desc
.bNumEndpoints
!= 1)
1907 goto descriptor_error
;
1909 endpoint
= &desc
->endpoint
[0].desc
;
1911 /* If it's not an interrupt in endpoint, we'd better punt! */
1912 if (!usb_endpoint_is_int_in(endpoint
))
1913 goto descriptor_error
;
1915 /* We found a hub */
1916 dev_info (&intf
->dev
, "USB hub found\n");
1918 hub
= kzalloc(sizeof(*hub
), GFP_KERNEL
);
1920 dev_dbg (&intf
->dev
, "couldn't kmalloc hub struct\n");
1924 kref_init(&hub
->kref
);
1925 INIT_LIST_HEAD(&hub
->event_list
);
1926 hub
->intfdev
= &intf
->dev
;
1928 INIT_DELAYED_WORK(&hub
->leds
, led_work
);
1929 INIT_DELAYED_WORK(&hub
->init_work
, NULL
);
1932 usb_set_intfdata (intf
, hub
);
1933 intf
->needs_remote_wakeup
= 1;
1934 pm_suspend_ignore_children(&intf
->dev
, true);
1936 if (hdev
->speed
== USB_SPEED_HIGH
)
1939 if (id
->driver_info
& HUB_QUIRK_CHECK_PORT_AUTOSUSPEND
)
1940 hub
->quirk_check_port_auto_suspend
= 1;
1942 if (hub_configure(hub
, endpoint
) >= 0)
1945 hub_disconnect (intf
);
1950 hub_ioctl(struct usb_interface
*intf
, unsigned int code
, void *user_data
)
1952 struct usb_device
*hdev
= interface_to_usbdev (intf
);
1953 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
1955 /* assert ifno == 0 (part of hub spec) */
1957 case USBDEVFS_HUB_PORTINFO
: {
1958 struct usbdevfs_hub_portinfo
*info
= user_data
;
1961 spin_lock_irq(&device_state_lock
);
1962 if (hdev
->devnum
<= 0)
1965 info
->nports
= hdev
->maxchild
;
1966 for (i
= 0; i
< info
->nports
; i
++) {
1967 if (hub
->ports
[i
]->child
== NULL
)
1971 hub
->ports
[i
]->child
->devnum
;
1974 spin_unlock_irq(&device_state_lock
);
1976 return info
->nports
+ 1;
1985 * Allow user programs to claim ports on a hub. When a device is attached
1986 * to one of these "claimed" ports, the program will "own" the device.
1988 static int find_port_owner(struct usb_device
*hdev
, unsigned port1
,
1989 struct dev_state
***ppowner
)
1991 if (hdev
->state
== USB_STATE_NOTATTACHED
)
1993 if (port1
== 0 || port1
> hdev
->maxchild
)
1996 /* This assumes that devices not managed by the hub driver
1997 * will always have maxchild equal to 0.
1999 *ppowner
= &(usb_hub_to_struct_hub(hdev
)->ports
[port1
- 1]->port_owner
);
2003 /* In the following three functions, the caller must hold hdev's lock */
2004 int usb_hub_claim_port(struct usb_device
*hdev
, unsigned port1
,
2005 struct dev_state
*owner
)
2008 struct dev_state
**powner
;
2010 rc
= find_port_owner(hdev
, port1
, &powner
);
2019 int usb_hub_release_port(struct usb_device
*hdev
, unsigned port1
,
2020 struct dev_state
*owner
)
2023 struct dev_state
**powner
;
2025 rc
= find_port_owner(hdev
, port1
, &powner
);
2028 if (*powner
!= owner
)
2034 void usb_hub_release_all_ports(struct usb_device
*hdev
, struct dev_state
*owner
)
2036 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
2039 for (n
= 0; n
< hdev
->maxchild
; n
++) {
2040 if (hub
->ports
[n
]->port_owner
== owner
)
2041 hub
->ports
[n
]->port_owner
= NULL
;
2046 /* The caller must hold udev's lock */
2047 bool usb_device_is_owned(struct usb_device
*udev
)
2049 struct usb_hub
*hub
;
2051 if (udev
->state
== USB_STATE_NOTATTACHED
|| !udev
->parent
)
2053 hub
= usb_hub_to_struct_hub(udev
->parent
);
2054 return !!hub
->ports
[udev
->portnum
- 1]->port_owner
;
2057 static void recursively_mark_NOTATTACHED(struct usb_device
*udev
)
2059 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
2062 for (i
= 0; i
< udev
->maxchild
; ++i
) {
2063 if (hub
->ports
[i
]->child
)
2064 recursively_mark_NOTATTACHED(hub
->ports
[i
]->child
);
2066 if (udev
->state
== USB_STATE_SUSPENDED
)
2067 udev
->active_duration
-= jiffies
;
2068 udev
->state
= USB_STATE_NOTATTACHED
;
2072 * usb_set_device_state - change a device's current state (usbcore, hcds)
2073 * @udev: pointer to device whose state should be changed
2074 * @new_state: new state value to be stored
2076 * udev->state is _not_ fully protected by the device lock. Although
2077 * most transitions are made only while holding the lock, the state can
2078 * can change to USB_STATE_NOTATTACHED at almost any time. This
2079 * is so that devices can be marked as disconnected as soon as possible,
2080 * without having to wait for any semaphores to be released. As a result,
2081 * all changes to any device's state must be protected by the
2082 * device_state_lock spinlock.
2084 * Once a device has been added to the device tree, all changes to its state
2085 * should be made using this routine. The state should _not_ be set directly.
2087 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
2088 * Otherwise udev->state is set to new_state, and if new_state is
2089 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
2090 * to USB_STATE_NOTATTACHED.
2092 void usb_set_device_state(struct usb_device
*udev
,
2093 enum usb_device_state new_state
)
2095 unsigned long flags
;
2098 spin_lock_irqsave(&device_state_lock
, flags
);
2099 if (udev
->state
== USB_STATE_NOTATTACHED
)
2101 else if (new_state
!= USB_STATE_NOTATTACHED
) {
2103 /* root hub wakeup capabilities are managed out-of-band
2104 * and may involve silicon errata ... ignore them here.
2107 if (udev
->state
== USB_STATE_SUSPENDED
2108 || new_state
== USB_STATE_SUSPENDED
)
2109 ; /* No change to wakeup settings */
2110 else if (new_state
== USB_STATE_CONFIGURED
)
2111 wakeup
= (udev
->quirks
&
2112 USB_QUIRK_IGNORE_REMOTE_WAKEUP
) ? 0 :
2113 udev
->actconfig
->desc
.bmAttributes
&
2114 USB_CONFIG_ATT_WAKEUP
;
2118 if (udev
->state
== USB_STATE_SUSPENDED
&&
2119 new_state
!= USB_STATE_SUSPENDED
)
2120 udev
->active_duration
-= jiffies
;
2121 else if (new_state
== USB_STATE_SUSPENDED
&&
2122 udev
->state
!= USB_STATE_SUSPENDED
)
2123 udev
->active_duration
+= jiffies
;
2124 udev
->state
= new_state
;
2126 recursively_mark_NOTATTACHED(udev
);
2127 spin_unlock_irqrestore(&device_state_lock
, flags
);
2129 device_set_wakeup_capable(&udev
->dev
, wakeup
);
2131 EXPORT_SYMBOL_GPL(usb_set_device_state
);
2134 * Choose a device number.
2136 * Device numbers are used as filenames in usbfs. On USB-1.1 and
2137 * USB-2.0 buses they are also used as device addresses, however on
2138 * USB-3.0 buses the address is assigned by the controller hardware
2139 * and it usually is not the same as the device number.
2141 * WUSB devices are simple: they have no hubs behind, so the mapping
2142 * device <-> virtual port number becomes 1:1. Why? to simplify the
2143 * life of the device connection logic in
2144 * drivers/usb/wusbcore/devconnect.c. When we do the initial secret
2145 * handshake we need to assign a temporary address in the unauthorized
2146 * space. For simplicity we use the first virtual port number found to
2147 * be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()]
2148 * and that becomes it's address [X < 128] or its unauthorized address
2151 * We add 1 as an offset to the one-based USB-stack port number
2152 * (zero-based wusb virtual port index) for two reasons: (a) dev addr
2153 * 0 is reserved by USB for default address; (b) Linux's USB stack
2154 * uses always #1 for the root hub of the controller. So USB stack's
2155 * port #1, which is wusb virtual-port #0 has address #2.
2157 * Devices connected under xHCI are not as simple. The host controller
2158 * supports virtualization, so the hardware assigns device addresses and
2159 * the HCD must setup data structures before issuing a set address
2160 * command to the hardware.
2162 static void choose_devnum(struct usb_device
*udev
)
2165 struct usb_bus
*bus
= udev
->bus
;
2167 /* If khubd ever becomes multithreaded, this will need a lock */
2169 devnum
= udev
->portnum
+ 1;
2170 BUG_ON(test_bit(devnum
, bus
->devmap
.devicemap
));
2172 /* Try to allocate the next devnum beginning at
2173 * bus->devnum_next. */
2174 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
, 128,
2177 devnum
= find_next_zero_bit(bus
->devmap
.devicemap
,
2179 bus
->devnum_next
= ( devnum
>= 127 ? 1 : devnum
+ 1);
2182 set_bit(devnum
, bus
->devmap
.devicemap
);
2183 udev
->devnum
= devnum
;
2187 static void release_devnum(struct usb_device
*udev
)
2189 if (udev
->devnum
> 0) {
2190 clear_bit(udev
->devnum
, udev
->bus
->devmap
.devicemap
);
2195 static void update_devnum(struct usb_device
*udev
, int devnum
)
2197 /* The address for a WUSB device is managed by wusbcore. */
2199 udev
->devnum
= devnum
;
2202 static void hub_free_dev(struct usb_device
*udev
)
2204 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2206 /* Root hubs aren't real devices, so don't free HCD resources */
2207 if (hcd
->driver
->free_dev
&& udev
->parent
)
2208 hcd
->driver
->free_dev(hcd
, udev
);
2212 * usb_disconnect - disconnect a device (usbcore-internal)
2213 * @pdev: pointer to device being disconnected
2214 * Context: !in_interrupt ()
2216 * Something got disconnected. Get rid of it and all of its children.
2218 * If *pdev is a normal device then the parent hub must already be locked.
2219 * If *pdev is a root hub then this routine will acquire the
2220 * usb_bus_list_lock on behalf of the caller.
2222 * Only hub drivers (including virtual root hub drivers for host
2223 * controllers) should ever call this.
2225 * This call is synchronous, and may not be used in an interrupt context.
2227 void usb_disconnect(struct usb_device
**pdev
)
2229 struct usb_device
*udev
= *pdev
;
2230 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
2232 struct timeval tv_begin
, tv_end
;
2233 struct timeval tv_before
, tv_after
;
2234 do_gettimeofday(&tv_begin
);
2236 #ifdef CONFIG_MTK_ICUSB_SUPPORT
2240 #ifdef CONFIG_MTK_ICUSB_SUPPORT
2241 is_icusb_rh
= is_musbfsh_rh(udev
->parent
);
2245 /* mark the device as inactive, so any further urb submissions for
2246 * this device (and any of its children) will fail immediately.
2247 * this quiesces everything except pending urbs.
2249 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
2250 dev_info(&udev
->dev
, "USB disconnect, device number %d\n",
2253 usb_lock_device(udev
);
2255 /* Free up all the children before we remove this device */
2256 for (i
= 0; i
< udev
->maxchild
; i
++) {
2257 if (hub
->ports
[i
]->child
)
2258 usb_disconnect(&hub
->ports
[i
]->child
);
2261 /* deallocate hcd/hardware state ... nuking all pending urbs and
2262 * cleaning up all state associated with the current configuration
2263 * so that the hardware is now fully quiesced.
2265 dev_dbg (&udev
->dev
, "unregistering device\n");
2267 do_gettimeofday(&tv_before
);
2268 usb_disable_device(udev
, 0);
2269 do_gettimeofday(&tv_after
);
2270 MYDBG("usb_disable_device(), time spent, sec : %d, usec : %d\n", (unsigned int)(tv_after
.tv_sec
- tv_before
.tv_sec
), (unsigned int)(tv_after
.tv_usec
- tv_before
.tv_usec
));
2272 usb_hcd_synchronize_unlinks(udev
);
2275 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
2276 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
2278 sysfs_remove_link(&udev
->dev
.kobj
, "port");
2279 sysfs_remove_link(&port_dev
->dev
.kobj
, "device");
2281 if (!port_dev
->did_runtime_put
)
2282 pm_runtime_put(&port_dev
->dev
);
2284 port_dev
->did_runtime_put
= false;
2287 do_gettimeofday(&tv_before
);
2288 usb_remove_ep_devs(&udev
->ep0
);
2289 do_gettimeofday(&tv_after
);
2290 MYDBG("usb_remove_ep_devs(), time spent, sec : %d, usec : %d\n", (unsigned int)(tv_after
.tv_sec
- tv_before
.tv_sec
), (unsigned int)(tv_after
.tv_usec
- tv_before
.tv_usec
));
2292 usb_unlock_device(udev
);
2294 /* Unregister the device. The device driver is responsible
2295 * for de-configuring the device and invoking the remove-device
2296 * notifier chain (used by usbfs and possibly others).
2298 do_gettimeofday(&tv_before
);
2299 device_del(&udev
->dev
);
2300 do_gettimeofday(&tv_after
);
2301 MYDBG("device_del(), time spent, sec : %d, usec : %d\n", (unsigned int)(tv_after
.tv_sec
- tv_before
.tv_sec
), (unsigned int)(tv_after
.tv_usec
- tv_before
.tv_usec
));
2303 /* Free the device number and delete the parent's children[]
2304 * (or root_hub) pointer.
2306 release_devnum(udev
);
2308 /* Avoid races with recursively_mark_NOTATTACHED() */
2309 spin_lock_irq(&device_state_lock
);
2311 spin_unlock_irq(&device_state_lock
);
2315 put_device(&udev
->dev
);
2317 #ifdef CONFIG_MTK_ICUSB_SUPPORT
2320 set_icusb_sts_disconnect_done();
2321 MYDBG("ICUSB Disconnect\n");
2324 do_gettimeofday(&tv_end
);
2325 MYDBG("time spent, sec : %d, usec : %d\n", (unsigned int)(tv_end
.tv_sec
- tv_begin
.tv_sec
), (unsigned int)(tv_end
.tv_usec
- tv_begin
.tv_usec
));
2328 #ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES
2329 static void show_string(struct usb_device
*udev
, char *id
, char *string
)
2333 dev_info(&udev
->dev
, "%s: %s\n", id
, string
);
2336 static void announce_device(struct usb_device
*udev
)
2338 dev_info(&udev
->dev
, "New USB device found, idVendor=%04x, idProduct=%04x\n",
2339 le16_to_cpu(udev
->descriptor
.idVendor
),
2340 le16_to_cpu(udev
->descriptor
.idProduct
));
2341 dev_info(&udev
->dev
,
2342 "New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n",
2343 udev
->descriptor
.iManufacturer
,
2344 udev
->descriptor
.iProduct
,
2345 udev
->descriptor
.iSerialNumber
);
2346 show_string(udev
, "Product", udev
->product
);
2347 show_string(udev
, "Manufacturer", udev
->manufacturer
);
2348 show_string(udev
, "SerialNumber", udev
->serial
);
2351 static inline void announce_device(struct usb_device
*udev
) { }
2354 #ifdef CONFIG_USB_OTG
2355 #include "otg_whitelist.h"
2359 * usb_enumerate_device_otg - FIXME (usbcore-internal)
2360 * @udev: newly addressed device (in ADDRESS state)
2362 * Finish enumeration for On-The-Go devices
2364 static int usb_enumerate_device_otg(struct usb_device
*udev
)
2368 #ifdef CONFIG_USB_OTG
2370 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
2371 * to wake us after we've powered off VBUS; and HNP, switching roles
2372 * "host" to "peripheral". The OTG descriptor helps figure this out.
2374 if (!udev
->bus
->is_b_host
2376 && udev
->parent
== udev
->bus
->root_hub
) {
2377 struct usb_otg_descriptor
*desc
= NULL
;
2378 struct usb_bus
*bus
= udev
->bus
;
2380 /* descriptor may appear anywhere in config */
2381 if (__usb_get_extra_descriptor (udev
->rawdescriptors
[0],
2382 le16_to_cpu(udev
->config
[0].desc
.wTotalLength
),
2383 USB_DT_OTG
, (void **) &desc
) == 0) {
2384 if (desc
->bmAttributes
& USB_OTG_HNP
) {
2385 unsigned port1
= udev
->portnum
;
2387 dev_info(&udev
->dev
,
2388 "Dual-Role OTG device on %sHNP port\n",
2389 (port1
== bus
->otg_port
)
2392 /* enable HNP before suspend, it's simpler */
2393 if (port1
== bus
->otg_port
)
2394 bus
->b_hnp_enable
= 1;
2395 err
= usb_control_msg(udev
,
2396 usb_sndctrlpipe(udev
, 0),
2397 USB_REQ_SET_FEATURE
, 0,
2399 ? USB_DEVICE_B_HNP_ENABLE
2400 : USB_DEVICE_A_ALT_HNP_SUPPORT
,
2401 0, NULL
, 0, USB_CTRL_SET_TIMEOUT
);
2403 /* OTG MESSAGE: report errors here,
2404 * customize to match your product.
2406 dev_info(&udev
->dev
,
2407 "can't set HNP mode: %d\n",
2409 bus
->b_hnp_enable
= 0;
2415 if (!is_targeted(udev
)) {
2417 /* Maybe it can talk to us, though we can't talk to it.
2418 * (Includes HNP test device.)
2420 if (udev
->bus
->b_hnp_enable
|| udev
->bus
->is_b_host
) {
2421 err
= usb_port_suspend(udev
, PMSG_SUSPEND
);
2423 dev_dbg(&udev
->dev
, "HNP fail, %d\n", err
);
2435 * usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
2436 * @udev: newly addressed device (in ADDRESS state)
2438 * This is only called by usb_new_device() and usb_authorize_device()
2439 * and FIXME -- all comments that apply to them apply here wrt to
2442 * If the device is WUSB and not authorized, we don't attempt to read
2443 * the string descriptors, as they will be errored out by the device
2444 * until it has been authorized.
2446 static int usb_enumerate_device(struct usb_device
*udev
)
2450 if (udev
->config
== NULL
) {
2451 err
= usb_get_configuration(udev
);
2454 dev_err(&udev
->dev
, "can't read configurations, error %d\n",
2460 /* read the standard strings and cache them if present */
2461 udev
->product
= usb_cache_string(udev
, udev
->descriptor
.iProduct
);
2462 udev
->manufacturer
= usb_cache_string(udev
,
2463 udev
->descriptor
.iManufacturer
);
2464 udev
->serial
= usb_cache_string(udev
, udev
->descriptor
.iSerialNumber
);
2466 err
= usb_enumerate_device_otg(udev
);
2468 #if defined(CONFIG_USBIF_COMPLIANCE) && defined(CONFIG_USB_XHCI_HCD)
2469 if (udev
->parent
){ // we don't have to check ourself (roothub)
2470 if (!is_targeted(udev
)) {
2471 usbif_u3h_send_event("DEV_NOT_SUPPORTED");
2480 usb_detect_interface_quirks(udev
);
2485 static void set_usb_port_removable(struct usb_device
*udev
)
2487 struct usb_device
*hdev
= udev
->parent
;
2488 struct usb_hub
*hub
;
2489 u8 port
= udev
->portnum
;
2490 u16 wHubCharacteristics
;
2491 bool removable
= true;
2496 hub
= usb_hub_to_struct_hub(udev
->parent
);
2498 wHubCharacteristics
= le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
2500 if (!(wHubCharacteristics
& HUB_CHAR_COMPOUND
))
2503 if (hub_is_superspeed(hdev
)) {
2504 if (le16_to_cpu(hub
->descriptor
->u
.ss
.DeviceRemovable
)
2508 if (hub
->descriptor
->u
.hs
.DeviceRemovable
[port
/ 8] & (1 << (port
% 8)))
2513 udev
->removable
= USB_DEVICE_REMOVABLE
;
2515 udev
->removable
= USB_DEVICE_FIXED
;
2519 * usb_new_device - perform initial device setup (usbcore-internal)
2520 * @udev: newly addressed device (in ADDRESS state)
2522 * This is called with devices which have been detected but not fully
2523 * enumerated. The device descriptor is available, but not descriptors
2524 * for any device configuration. The caller must have locked either
2525 * the parent hub (if udev is a normal device) or else the
2526 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
2527 * udev has already been installed, but udev is not yet visible through
2528 * sysfs or other filesystem code.
2530 * It will return if the device is configured properly or not. Zero if
2531 * the interface was registered with the driver core; else a negative
2534 * This call is synchronous, and may not be used in an interrupt context.
2536 * Only the hub driver or root-hub registrar should ever call this.
2538 int usb_new_device(struct usb_device
*udev
)
2543 /* Initialize non-root-hub device wakeup to disabled;
2544 * device (un)configuration controls wakeup capable
2545 * sysfs power/wakeup controls wakeup enabled/disabled
2547 device_init_wakeup(&udev
->dev
, 0);
2548 MYDBG("udev :%p\n", udev
);
2549 #ifdef CONFIG_MTK_DT_USB_SUPPORT
2550 #ifdef CONFIG_PM_RUNTIME
2551 if(is_musbfsh_rh(udev
->parent
)){
2553 /*find out struct *usb_hub and hook it */
2554 usb11_hub
= usb_hub_to_struct_hub(udev
->parent
);
2560 /* Tell the runtime-PM framework the device is active */
2561 pm_runtime_set_active(&udev
->dev
);
2562 pm_runtime_get_noresume(&udev
->dev
);
2563 pm_runtime_use_autosuspend(&udev
->dev
);
2564 pm_runtime_enable(&udev
->dev
);
2566 /* By default, forbid autosuspend for all devices. It will be
2567 * allowed for hubs during binding.
2569 usb_disable_autosuspend(udev
);
2571 err
= usb_enumerate_device(udev
); /* Read descriptors */
2574 dev_dbg(&udev
->dev
, "udev %d, busnum %d, minor = %d\n",
2575 udev
->devnum
, udev
->bus
->busnum
,
2576 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
2577 /* export the usbdev device-node for libusb */
2578 udev
->dev
.devt
= MKDEV(USB_DEVICE_MAJOR
,
2579 (((udev
->bus
->busnum
-1) * 128) + (udev
->devnum
-1)));
2581 /* Tell the world! */
2582 announce_device(udev
);
2585 add_device_randomness(udev
->serial
, strlen(udev
->serial
));
2587 add_device_randomness(udev
->product
, strlen(udev
->product
));
2588 if (udev
->manufacturer
)
2589 add_device_randomness(udev
->manufacturer
,
2590 strlen(udev
->manufacturer
));
2592 device_enable_async_suspend(&udev
->dev
);
2595 * check whether the hub marks this port as non-removable. Do it
2596 * now so that platform-specific data can override it in
2600 set_usb_port_removable(udev
);
2602 /* Register the device. The device driver is responsible
2603 * for configuring the device and invoking the add-device
2604 * notifier chain (used by usbfs and possibly others).
2606 err
= device_add(&udev
->dev
);
2608 dev_err(&udev
->dev
, "can't device_add, error %d\n", err
);
2612 /* Create link files between child device and usb port device. */
2614 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
2615 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
2617 err
= sysfs_create_link(&udev
->dev
.kobj
,
2618 &port_dev
->dev
.kobj
, "port");
2622 err
= sysfs_create_link(&port_dev
->dev
.kobj
,
2623 &udev
->dev
.kobj
, "device");
2625 sysfs_remove_link(&udev
->dev
.kobj
, "port");
2629 pm_runtime_get_sync(&port_dev
->dev
);
2632 (void) usb_create_ep_devs(&udev
->dev
, &udev
->ep0
, udev
);
2633 usb_mark_last_busy(udev
);
2634 pm_runtime_put_sync_autosuspend(&udev
->dev
);
2638 usb_set_device_state(udev
, USB_STATE_NOTATTACHED
);
2639 pm_runtime_disable(&udev
->dev
);
2640 pm_runtime_set_suspended(&udev
->dev
);
2646 * usb_deauthorize_device - deauthorize a device (usbcore-internal)
2647 * @usb_dev: USB device
2649 * Move the USB device to a very basic state where interfaces are disabled
2650 * and the device is in fact unconfigured and unusable.
2652 * We share a lock (that we have) with device_del(), so we need to
2655 int usb_deauthorize_device(struct usb_device
*usb_dev
)
2657 usb_lock_device(usb_dev
);
2658 if (usb_dev
->authorized
== 0)
2659 goto out_unauthorized
;
2661 usb_dev
->authorized
= 0;
2662 usb_set_configuration(usb_dev
, -1);
2665 usb_unlock_device(usb_dev
);
2670 int usb_authorize_device(struct usb_device
*usb_dev
)
2674 usb_lock_device(usb_dev
);
2675 if (usb_dev
->authorized
== 1)
2676 goto out_authorized
;
2678 result
= usb_autoresume_device(usb_dev
);
2680 dev_err(&usb_dev
->dev
,
2681 "can't autoresume for authorization: %d\n", result
);
2682 goto error_autoresume
;
2684 result
= usb_get_device_descriptor(usb_dev
, sizeof(usb_dev
->descriptor
));
2686 dev_err(&usb_dev
->dev
, "can't re-read device descriptor for "
2687 "authorization: %d\n", result
);
2688 goto error_device_descriptor
;
2691 usb_dev
->authorized
= 1;
2692 /* Choose and set the configuration. This registers the interfaces
2693 * with the driver core and lets interface drivers bind to them.
2695 c
= usb_choose_configuration(usb_dev
);
2697 result
= usb_set_configuration(usb_dev
, c
);
2699 dev_err(&usb_dev
->dev
,
2700 "can't set config #%d, error %d\n", c
, result
);
2701 /* This need not be fatal. The user can try to
2702 * set other configurations. */
2705 dev_info(&usb_dev
->dev
, "authorized to connect\n");
2707 error_device_descriptor
:
2708 usb_autosuspend_device(usb_dev
);
2711 usb_unlock_device(usb_dev
); // complements locktree
2716 /* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
2717 static unsigned hub_is_wusb(struct usb_hub
*hub
)
2719 struct usb_hcd
*hcd
;
2720 if (hub
->hdev
->parent
!= NULL
) /* not a root hub? */
2722 hcd
= container_of(hub
->hdev
->bus
, struct usb_hcd
, self
);
2723 return hcd
->wireless
;
2727 #define PORT_RESET_TRIES 5
2728 #define SET_ADDRESS_TRIES 2
2729 #define GET_DESCRIPTOR_TRIES 2
2730 #define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
2731 #define USE_NEW_SCHEME(i) ((i) / 2 == (int)old_scheme_first)
2733 #define HUB_ROOT_RESET_TIME 50 /* times are in msec */
2734 #define HUB_SHORT_RESET_TIME 10
2735 #define HUB_BH_RESET_TIME 50
2736 #define HUB_LONG_RESET_TIME 200
2737 #define HUB_RESET_TIMEOUT 800
2739 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
2740 struct usb_device
*udev
, unsigned int delay
, bool warm
);
2742 /* Is a USB 3.0 port in the Inactive or Complinance Mode state?
2743 * Port worm reset is required to recover
2745 static bool hub_port_warm_reset_required(struct usb_hub
*hub
, u16 portstatus
)
2747 return hub_is_superspeed(hub
->hdev
) &&
2748 (((portstatus
& USB_PORT_STAT_LINK_STATE
) ==
2749 USB_SS_PORT_LS_SS_INACTIVE
) ||
2750 ((portstatus
& USB_PORT_STAT_LINK_STATE
) ==
2751 USB_SS_PORT_LS_COMP_MOD
)) ;
2754 static int hub_port_wait_reset(struct usb_hub
*hub
, int port1
,
2755 struct usb_device
*udev
, unsigned int delay
, bool warm
)
2757 int delay_time
, ret
;
2761 for (delay_time
= 0;
2762 delay_time
< HUB_RESET_TIMEOUT
;
2763 delay_time
+= delay
) {
2764 /* wait to give the device a chance to reset */
2767 /* read and decode port status */
2769 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
2774 /* The port state is unknown until the reset completes. */
2775 if (!(portstatus
& USB_PORT_STAT_RESET
))
2778 /* switch to the long delay after two short delay failures */
2779 if (delay_time
>= 2 * HUB_SHORT_RESET_TIME
)
2780 delay
= HUB_LONG_RESET_TIME
;
2782 dev_dbg (hub
->intfdev
,
2783 "port %d not %sreset yet, waiting %dms\n",
2784 port1
, warm
? "warm " : "", delay
);
2787 if ((portstatus
& USB_PORT_STAT_RESET
))
2790 if (hub_port_warm_reset_required(hub
, portstatus
))
2793 /* Device went away? */
2794 if (!(portstatus
& USB_PORT_STAT_CONNECTION
))
2797 /* bomb out completely if the connection bounced. A USB 3.0
2798 * connection may bounce if multiple warm resets were issued,
2799 * but the device may have successfully re-connected. Ignore it.
2801 if (!hub_is_superspeed(hub
->hdev
) &&
2802 (portchange
& USB_PORT_STAT_C_CONNECTION
))
2805 if (!(portstatus
& USB_PORT_STAT_ENABLE
))
2811 if (hub_is_wusb(hub
))
2812 udev
->speed
= USB_SPEED_WIRELESS
;
2813 else if (hub_is_superspeed(hub
->hdev
))
2814 udev
->speed
= USB_SPEED_SUPER
;
2815 else if (portstatus
& USB_PORT_STAT_HIGH_SPEED
)
2816 udev
->speed
= USB_SPEED_HIGH
;
2817 else if (portstatus
& USB_PORT_STAT_LOW_SPEED
)
2818 udev
->speed
= USB_SPEED_LOW
;
2820 udev
->speed
= USB_SPEED_FULL
;
2824 static void hub_port_finish_reset(struct usb_hub
*hub
, int port1
,
2825 struct usb_device
*udev
, int *status
)
2829 /* TRSTRCY = 10 ms; plus some extra */
2832 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
2834 update_devnum(udev
, 0);
2835 /* The xHC may think the device is already reset,
2836 * so ignore the status.
2838 if (hcd
->driver
->reset_device
)
2839 hcd
->driver
->reset_device(hcd
, udev
);
2844 usb_clear_port_feature(hub
->hdev
,
2845 port1
, USB_PORT_FEAT_C_RESET
);
2846 if (hub_is_superspeed(hub
->hdev
)) {
2847 usb_clear_port_feature(hub
->hdev
, port1
,
2848 USB_PORT_FEAT_C_BH_PORT_RESET
);
2849 usb_clear_port_feature(hub
->hdev
, port1
,
2850 USB_PORT_FEAT_C_PORT_LINK_STATE
);
2851 usb_clear_port_feature(hub
->hdev
, port1
,
2852 USB_PORT_FEAT_C_CONNECTION
);
2855 usb_set_device_state(udev
, *status
2856 ? USB_STATE_NOTATTACHED
2857 : USB_STATE_DEFAULT
);
2862 /* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */
2863 static int hub_port_reset(struct usb_hub
*hub
, int port1
,
2864 struct usb_device
*udev
, unsigned int delay
, bool warm
)
2867 u16 portchange
, portstatus
;
2869 if (!hub_is_superspeed(hub
->hdev
)) {
2871 dev_err(hub
->intfdev
, "only USB3 hub support "
2875 /* Block EHCI CF initialization during the port reset.
2876 * Some companion controllers don't like it when they mix.
2878 down_read(&ehci_cf_port_reset_rwsem
);
2881 * If the caller hasn't explicitly requested a warm reset,
2882 * double check and see if one is needed.
2884 status
= hub_port_status(hub
, port1
,
2885 &portstatus
, &portchange
);
2889 if (hub_port_warm_reset_required(hub
, portstatus
))
2893 /* Reset the port */
2894 for (i
= 0; i
< PORT_RESET_TRIES
; i
++) {
2896 status
= set_port_feature(hub
->hdev
, port1
, (warm
?
2897 USB_PORT_FEAT_BH_PORT_RESET
:
2898 USB_PORT_FEAT_RESET
));
2900 if (status
== -ENODEV
) {
2902 ; /* The hub is gone */
2903 } else if (status
) {
2905 dev_err(hub
->intfdev
,
2906 "cannot %sreset port %d (err = %d)\n",
2907 warm
? "warm " : "", port1
, status
);
2910 status
= hub_port_wait_reset(hub
, port1
, udev
, delay
,
2912 if (status
&& status
!= -ENOTCONN
)
2915 dev_dbg(hub
->intfdev
,
2916 "port_wait_reset: err = %d\n",
2922 /* Check for disconnect or reset */
2923 if (status
== 0 || status
== -ENOTCONN
|| status
== -ENODEV
) {
2925 hub_port_finish_reset(hub
, port1
, udev
, &status
);
2928 if (!hub_is_superspeed(hub
->hdev
))
2932 * If a USB 3.0 device migrates from reset to an error
2933 * state, re-issue the warm reset.
2935 if (hub_port_status(hub
, port1
,
2936 &portstatus
, &portchange
) < 0)
2939 if (!hub_port_warm_reset_required(hub
, portstatus
))
2943 * If the port is in SS.Inactive or Compliance Mode, the
2944 * hot or warm reset failed. Try another warm reset.
2947 dev_dbg(hub
->intfdev
, "hot reset failed, warm reset port %d\n",
2954 dev_dbg (hub
->intfdev
,
2955 "port %d not enabled, trying %sreset again...\n",
2956 port1
, warm
? "warm " : "");
2957 delay
= HUB_LONG_RESET_TIME
;
2962 dev_err (hub
->intfdev
,
2963 "Cannot enable port %i. Maybe the USB cable is bad?\n",
2967 if (!hub_is_superspeed(hub
->hdev
))
2970 up_read(&ehci_cf_port_reset_rwsem
);
2978 /* Check if a port is power on */
2979 static int port_is_power_on(struct usb_hub
*hub
, unsigned portstatus
)
2983 if (hub_is_superspeed(hub
->hdev
)) {
2984 if (portstatus
& USB_SS_PORT_STAT_POWER
)
2987 if (portstatus
& USB_PORT_STAT_POWER
)
2996 /* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */
2997 static int port_is_suspended(struct usb_hub
*hub
, unsigned portstatus
)
3001 if (hub_is_superspeed(hub
->hdev
)) {
3002 if ((portstatus
& USB_PORT_STAT_LINK_STATE
)
3003 == USB_SS_PORT_LS_U3
)
3006 if (portstatus
& USB_PORT_STAT_SUSPEND
)
3013 /* Determine whether the device on a port is ready for a normal resume,
3014 * is ready for a reset-resume, or should be disconnected.
3016 static int check_port_resume_type(struct usb_device
*udev
,
3017 struct usb_hub
*hub
, int port1
,
3018 int status
, unsigned portchange
, unsigned portstatus
)
3020 /* Is the device still present? */
3021 if (status
|| port_is_suspended(hub
, portstatus
) ||
3022 !port_is_power_on(hub
, portstatus
) ||
3023 !(portstatus
& USB_PORT_STAT_CONNECTION
)) {
3028 /* Can't do a normal resume if the port isn't enabled,
3029 * so try a reset-resume instead.
3031 else if (!(portstatus
& USB_PORT_STAT_ENABLE
) && !udev
->reset_resume
) {
3032 if (udev
->persist_enabled
)
3033 udev
->reset_resume
= 1;
3039 dev_dbg(hub
->intfdev
,
3040 "port %d status %04x.%04x after resume, %d\n",
3041 port1
, portchange
, portstatus
, status
);
3042 } else if (udev
->reset_resume
) {
3044 /* Late port handoff can set status-change bits */
3045 if (portchange
& USB_PORT_STAT_C_CONNECTION
)
3046 usb_clear_port_feature(hub
->hdev
, port1
,
3047 USB_PORT_FEAT_C_CONNECTION
);
3048 if (portchange
& USB_PORT_STAT_C_ENABLE
)
3049 usb_clear_port_feature(hub
->hdev
, port1
,
3050 USB_PORT_FEAT_C_ENABLE
);
3056 int usb_disable_ltm(struct usb_device
*udev
)
3058 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3060 /* Check if the roothub and device supports LTM. */
3061 if (!usb_device_supports_ltm(hcd
->self
.root_hub
) ||
3062 !usb_device_supports_ltm(udev
))
3065 /* Clear Feature LTM Enable can only be sent if the device is
3068 if (!udev
->actconfig
)
3071 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3072 USB_REQ_CLEAR_FEATURE
, USB_RECIP_DEVICE
,
3073 USB_DEVICE_LTM_ENABLE
, 0, NULL
, 0,
3074 USB_CTRL_SET_TIMEOUT
);
3076 EXPORT_SYMBOL_GPL(usb_disable_ltm
);
3078 void usb_enable_ltm(struct usb_device
*udev
)
3080 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
3082 /* Check if the roothub and device supports LTM. */
3083 if (!usb_device_supports_ltm(hcd
->self
.root_hub
) ||
3084 !usb_device_supports_ltm(udev
))
3087 /* Set Feature LTM Enable can only be sent if the device is
3090 if (!udev
->actconfig
)
3093 usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3094 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
3095 USB_DEVICE_LTM_ENABLE
, 0, NULL
, 0,
3096 USB_CTRL_SET_TIMEOUT
);
3098 EXPORT_SYMBOL_GPL(usb_enable_ltm
);
3102 * usb_disable_function_remotewakeup - disable usb3.0
3103 * device's function remote wakeup
3104 * @udev: target device
3106 * Assume there's only one function on the USB 3.0
3107 * device and disable remote wake for the first
3108 * interface. FIXME if the interface association
3109 * descriptor shows there's more than one function.
3111 static int usb_disable_function_remotewakeup(struct usb_device
*udev
)
3113 return usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3114 USB_REQ_CLEAR_FEATURE
, USB_RECIP_INTERFACE
,
3115 USB_INTRF_FUNC_SUSPEND
, 0, NULL
, 0,
3116 USB_CTRL_SET_TIMEOUT
);
3119 /* Count of wakeup-enabled devices at or below udev */
3120 static unsigned wakeup_enabled_descendants(struct usb_device
*udev
)
3122 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
);
3124 return udev
->do_remote_wakeup
+
3125 (hub
? hub
->wakeup_enabled_descendants
: 0);
3129 * usb_port_suspend - suspend a usb device's upstream port
3130 * @udev: device that's no longer in active use, not a root hub
3131 * Context: must be able to sleep; device not locked; pm locks held
3133 * Suspends a USB device that isn't in active use, conserving power.
3134 * Devices may wake out of a suspend, if anything important happens,
3135 * using the remote wakeup mechanism. They may also be taken out of
3136 * suspend by the host, using usb_port_resume(). It's also routine
3137 * to disconnect devices while they are suspended.
3139 * This only affects the USB hardware for a device; its interfaces
3140 * (and, for hubs, child devices) must already have been suspended.
3142 * Selective port suspend reduces power; most suspended devices draw
3143 * less than 500 uA. It's also used in OTG, along with remote wakeup.
3144 * All devices below the suspended port are also suspended.
3146 * Devices leave suspend state when the host wakes them up. Some devices
3147 * also support "remote wakeup", where the device can activate the USB
3148 * tree above them to deliver data, such as a keypress or packet. In
3149 * some cases, this wakes the USB host.
3151 * Suspending OTG devices may trigger HNP, if that's been enabled
3152 * between a pair of dual-role devices. That will change roles, such
3153 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
3155 * Devices on USB hub ports have only one "suspend" state, corresponding
3156 * to ACPI D2, "may cause the device to lose some context".
3157 * State transitions include:
3159 * - suspend, resume ... when the VBUS power link stays live
3160 * - suspend, disconnect ... VBUS lost
3162 * Once VBUS drop breaks the circuit, the port it's using has to go through
3163 * normal re-enumeration procedures, starting with enabling VBUS power.
3164 * Other than re-initializing the hub (plug/unplug, except for root hubs),
3165 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
3166 * timer, no SRP, no requests through sysfs.
3168 * If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get
3169 * suspended until their bus goes into global suspend (i.e., the root
3170 * hub is suspended). Nevertheless, we change @udev->state to
3171 * USB_STATE_SUSPENDED as this is the device's "logical" state. The actual
3172 * upstream port setting is stored in @udev->port_is_suspended.
3174 * Returns 0 on success, else negative errno.
3176 int usb_port_suspend(struct usb_device
*udev
, pm_message_t msg
)
3178 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
3179 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
3180 int port1
= udev
->portnum
;
3182 bool really_suspend
= true;
3184 /* enable remote wakeup when appropriate; this lets the device
3185 * wake up the upstream hub (including maybe the root hub).
3187 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
3188 * we don't explicitly enable it here.
3190 if (udev
->do_remote_wakeup
) {
3191 if (!hub_is_superspeed(hub
->hdev
)) {
3192 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3193 USB_REQ_SET_FEATURE
, USB_RECIP_DEVICE
,
3194 USB_DEVICE_REMOTE_WAKEUP
, 0,
3196 USB_CTRL_SET_TIMEOUT
);
3198 /* Assume there's only one function on the USB 3.0
3199 * device and enable remote wake for the first
3200 * interface. FIXME if the interface association
3201 * descriptor shows there's more than one function.
3203 status
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3204 USB_REQ_SET_FEATURE
,
3205 USB_RECIP_INTERFACE
,
3206 USB_INTRF_FUNC_SUSPEND
,
3207 USB_INTRF_FUNC_SUSPEND_RW
|
3208 USB_INTRF_FUNC_SUSPEND_LP
,
3210 USB_CTRL_SET_TIMEOUT
);
3213 dev_dbg(&udev
->dev
, "won't remote wakeup, status %d\n",
3215 /* bail if autosuspend is requested */
3216 if (PMSG_IS_AUTO(msg
))
3224 /* disable USB2 hardware LPM */
3225 if (udev
->usb2_hw_lpm_enabled
== 1)
3226 usb_set_usb2_hardware_lpm(udev
, 0);
3228 if (usb_disable_ltm(udev
)) {
3229 dev_err(&udev
->dev
, "Failed to disable LTM before suspend\n.");
3232 if (PMSG_IS_AUTO(msg
))
3235 if (usb_unlocked_disable_lpm(udev
)) {
3236 dev_err(&udev
->dev
, "Failed to disable LPM before suspend\n.");
3239 if (PMSG_IS_AUTO(msg
))
3244 if (hub_is_superspeed(hub
->hdev
))
3247 status
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_U3
);
3249 #if 0 /* behavior for kernel 3.10 */
3251 * For system suspend, we do not need to enable the suspend feature
3252 * on individual USB-2 ports. The devices will automatically go
3253 * into suspend a few ms after the root hub stops sending packets.
3254 * The USB 2.0 spec calls this "global suspend".
3256 * However, many USB hubs have a bug: They don't relay wakeup requests
3257 * from a downstream port if the port's suspend feature isn't on.
3258 * Therefore we will turn on the suspend feature if udev or any of its
3259 * descendants is enabled for remote wakeup.
3261 } else if (PMSG_IS_AUTO(msg
) || wakeup_enabled_descendants(udev
) > 0) {
3263 status
= set_port_feature(hub
->hdev
, port1
,
3264 USB_PORT_FEAT_SUSPEND
);
3266 really_suspend
= false;
3269 #else /*roll back behavior to kernel 3.4 */
3272 status
= set_port_feature(hub
->hdev
, port1
,
3273 USB_PORT_FEAT_SUSPEND
);
3278 dev_dbg(hub
->intfdev
, "can't suspend port %d, status %d\n",
3282 /* Try to enable USB3 LPM and LTM again */
3283 usb_unlocked_enable_lpm(udev
);
3285 usb_enable_ltm(udev
);
3287 /* Try to enable USB2 hardware LPM again */
3288 if (udev
->usb2_hw_lpm_capable
== 1)
3289 usb_set_usb2_hardware_lpm(udev
, 1);
3291 if (udev
->do_remote_wakeup
) {
3292 if (udev
->speed
< USB_SPEED_SUPER
)
3293 usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3294 USB_REQ_CLEAR_FEATURE
,
3296 USB_DEVICE_REMOTE_WAKEUP
, 0,
3297 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3299 usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3300 USB_REQ_CLEAR_FEATURE
,
3301 USB_RECIP_INTERFACE
,
3302 USB_INTRF_FUNC_SUSPEND
, 0,
3303 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
3307 /* System sleep transitions should never fail */
3308 if (!PMSG_IS_AUTO(msg
))
3311 dev_dbg(&udev
->dev
, "usb %ssuspend, wakeup %d\n",
3312 (PMSG_IS_AUTO(msg
) ? "auto-" : ""),
3313 udev
->do_remote_wakeup
);
3314 if (really_suspend
) {
3315 udev
->port_is_suspended
= 1;
3317 /* device has up to 10 msec to fully suspend */
3320 usb_set_device_state(udev
, USB_STATE_SUSPENDED
);
3323 if (status
== 0 && !udev
->do_remote_wakeup
&& udev
->persist_enabled
) {
3324 pm_runtime_put_sync(&port_dev
->dev
);
3325 port_dev
->did_runtime_put
= true;
3328 usb_mark_last_busy(hub
->hdev
);
3333 * If the USB "suspend" state is in use (rather than "global suspend"),
3334 * many devices will be individually taken out of suspend state using
3335 * special "resume" signaling. This routine kicks in shortly after
3336 * hardware resume signaling is finished, either because of selective
3337 * resume (by host) or remote wakeup (by device) ... now see what changed
3338 * in the tree that's rooted at this device.
3340 * If @udev->reset_resume is set then the device is reset before the
3341 * status check is done.
3343 static int finish_port_resume(struct usb_device
*udev
)
3348 /* caller owns the udev device lock */
3349 dev_dbg(&udev
->dev
, "%s\n",
3350 udev
->reset_resume
? "finish reset-resume" : "finish resume");
3352 /* usb ch9 identifies four variants of SUSPENDED, based on what
3353 * state the device resumes to. Linux currently won't see the
3354 * first two on the host side; they'd be inside hub_port_init()
3355 * during many timeouts, but khubd can't suspend until later.
3357 usb_set_device_state(udev
, udev
->actconfig
3358 ? USB_STATE_CONFIGURED
3359 : USB_STATE_ADDRESS
);
3361 /* 10.5.4.5 says not to reset a suspended port if the attached
3362 * device is enabled for remote wakeup. Hence the reset
3363 * operation is carried out here, after the port has been
3366 if (udev
->reset_resume
)
3368 status
= usb_reset_and_verify_device(udev
);
3370 /* 10.5.4.5 says be sure devices in the tree are still there.
3371 * For now let's assume the device didn't go crazy on resume,
3372 * and device drivers will know about any resume quirks.
3377 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0, &devstatus
);
3378 MYDBG("%d\n", status
);
3380 status
= (status
> 0 ? 0 : -ENODEV
);
3382 /* If a normal resume failed, try doing a reset-resume */
3383 if (status
&& !udev
->reset_resume
&& udev
->persist_enabled
) {
3384 dev_dbg(&udev
->dev
, "retry with reset-resume\n");
3385 udev
->reset_resume
= 1;
3386 goto retry_reset_resume
;
3391 dev_dbg(&udev
->dev
, "gone after usb resume? status %d\n",
3394 * There are a few quirky devices which violate the standard
3395 * by claiming to have remote wakeup enabled after a reset,
3396 * which crash if the feature is cleared, hence check for
3397 * udev->reset_resume
3399 } else if (udev
->actconfig
&& !udev
->reset_resume
) {
3400 if (!hub_is_superspeed(udev
->parent
)) {
3401 le16_to_cpus(&devstatus
);
3402 if (devstatus
& (1 << USB_DEVICE_REMOTE_WAKEUP
))
3403 status
= usb_control_msg(udev
,
3404 usb_sndctrlpipe(udev
, 0),
3405 USB_REQ_CLEAR_FEATURE
,
3407 USB_DEVICE_REMOTE_WAKEUP
, 0,
3409 USB_CTRL_SET_TIMEOUT
);
3411 status
= usb_get_status(udev
, USB_RECIP_INTERFACE
, 0,
3413 le16_to_cpus(&devstatus
);
3414 if (!status
&& devstatus
& (USB_INTRF_STAT_FUNC_RW_CAP
3415 | USB_INTRF_STAT_FUNC_RW
))
3417 usb_disable_function_remotewakeup(udev
);
3422 "disable remote wakeup, status %d\n",
3430 * There are some SS USB devices which take longer time for link training.
3431 * XHCI specs 4.19.4 says that when Link training is successful, port
3432 * sets CSC bit to 1. So if SW reads port status before successful link
3433 * training, then it will not find device to be present.
3434 * USB Analyzer log with such buggy devices show that in some cases
3435 * device switch on the RX termination after long delay of host enabling
3436 * the VBUS. In few other cases it has been seen that device fails to
3437 * negotiate link training in first attempt. It has been
3438 * reported till now that few devices take as long as 2000 ms to train
3439 * the link after host enabling its VBUS and termination. Following
3440 * routine implements a 2000 ms timeout for link training. If in a case
3441 * link trains before timeout, loop will exit earlier.
3443 * FIXME: If a device was connected before suspend, but was removed
3444 * while system was asleep, then the loop in the following routine will
3445 * only exit at timeout.
3447 * This routine should only be called when persist is enabled for a SS
3450 static int wait_for_ss_port_enable(struct usb_device
*udev
,
3451 struct usb_hub
*hub
, int *port1
,
3452 u16
*portchange
, u16
*portstatus
)
3454 int status
= 0, delay_ms
= 0;
3456 while (delay_ms
< 2000) {
3457 if (status
|| *portstatus
& USB_PORT_STAT_CONNECTION
)
3461 status
= hub_port_status(hub
, *port1
, portstatus
, portchange
);
3467 * usb_port_resume - re-activate a suspended usb device's upstream port
3468 * @udev: device to re-activate, not a root hub
3469 * Context: must be able to sleep; device not locked; pm locks held
3471 * This will re-activate the suspended device, increasing power usage
3472 * while letting drivers communicate again with its endpoints.
3473 * USB resume explicitly guarantees that the power session between
3474 * the host and the device is the same as it was when the device
3477 * If @udev->reset_resume is set then this routine won't check that the
3478 * port is still enabled. Furthermore, finish_port_resume() above will
3479 * reset @udev. The end result is that a broken power session can be
3480 * recovered and @udev will appear to persist across a loss of VBUS power.
3482 * For example, if a host controller doesn't maintain VBUS suspend current
3483 * during a system sleep or is reset when the system wakes up, all the USB
3484 * power sessions below it will be broken. This is especially troublesome
3485 * for mass-storage devices containing mounted filesystems, since the
3486 * device will appear to have disconnected and all the memory mappings
3487 * to it will be lost. Using the USB_PERSIST facility, the device can be
3488 * made to appear as if it had not disconnected.
3490 * This facility can be dangerous. Although usb_reset_and_verify_device() makes
3491 * every effort to insure that the same device is present after the
3492 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
3493 * quite possible for a device to remain unaltered but its media to be
3494 * changed. If the user replaces a flash memory card while the system is
3495 * asleep, he will have only himself to blame when the filesystem on the
3496 * new card is corrupted and the system crashes.
3498 * Returns 0 on success, else negative errno.
3500 int usb_port_resume(struct usb_device
*udev
, pm_message_t msg
)
3502 struct usb_hub
*hub
= usb_hub_to_struct_hub(udev
->parent
);
3503 struct usb_port
*port_dev
= hub
->ports
[udev
->portnum
- 1];
3504 int port1
= udev
->portnum
;
3506 u16 portchange
, portstatus
;
3508 if (port_dev
->did_runtime_put
) {
3509 status
= pm_runtime_get_sync(&port_dev
->dev
);
3510 port_dev
->did_runtime_put
= false;
3512 dev_dbg(&udev
->dev
, "can't resume usb port, status %d\n",
3518 /* Skip the initial Clear-Suspend step for a remote wakeup */
3519 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3520 if (status
== 0 && !port_is_suspended(hub
, portstatus
))
3521 goto SuspendCleared
;
3523 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
3525 set_bit(port1
, hub
->busy_bits
);
3527 /* see 7.1.7.7; affects power usage, but not budgeting */
3528 if (hub_is_superspeed(hub
->hdev
))
3529 status
= hub_set_port_link_state(hub
, port1
, USB_SS_PORT_LS_U0
);
3531 status
= usb_clear_port_feature(hub
->hdev
,
3532 port1
, USB_PORT_FEAT_SUSPEND
);
3534 dev_dbg(hub
->intfdev
, "can't resume port %d, status %d\n",
3537 /* drive resume for USB_RESUME_TIMEOUT msec */
3538 dev_dbg(&udev
->dev
, "usb %sresume\n",
3539 (PMSG_IS_AUTO(msg
) ? "auto-" : ""));
3540 msleep(USB_RESUME_TIMEOUT
);
3542 /* Virtual root hubs can trigger on GET_PORT_STATUS to
3543 * stop resume signaling. Then finish the resume
3546 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3548 /* TRSMRCY = 10 msec */
3554 udev
->port_is_suspended
= 0;
3555 if (hub_is_superspeed(hub
->hdev
)) {
3556 if (portchange
& USB_PORT_STAT_C_LINK_STATE
)
3557 usb_clear_port_feature(hub
->hdev
, port1
,
3558 USB_PORT_FEAT_C_PORT_LINK_STATE
);
3560 if (portchange
& USB_PORT_STAT_C_SUSPEND
)
3561 usb_clear_port_feature(hub
->hdev
, port1
,
3562 USB_PORT_FEAT_C_SUSPEND
);
3566 clear_bit(port1
, hub
->busy_bits
);
3568 if (udev
->persist_enabled
&& hub_is_superspeed(hub
->hdev
))
3569 status
= wait_for_ss_port_enable(udev
, hub
, &port1
, &portchange
,
3572 status
= check_port_resume_type(udev
,
3573 hub
, port1
, status
, portchange
, portstatus
);
3575 status
= finish_port_resume(udev
);
3577 dev_dbg(&udev
->dev
, "can't resume, status %d\n", status
);
3578 hub_port_logical_disconnect(hub
, port1
);
3580 /* Try to enable USB2 hardware LPM */
3581 if (udev
->usb2_hw_lpm_capable
== 1)
3582 usb_set_usb2_hardware_lpm(udev
, 1);
3584 /* Try to enable USB3 LTM and LPM */
3585 usb_enable_ltm(udev
);
3586 usb_unlocked_enable_lpm(udev
);
3592 #endif /* CONFIG_PM */
3594 #ifdef CONFIG_PM_RUNTIME
3596 /* caller has locked udev */
3597 int usb_remote_wakeup(struct usb_device
*udev
)
3601 if (udev
->state
== USB_STATE_SUSPENDED
) {
3602 dev_dbg(&udev
->dev
, "usb %sresume\n", "wakeup-");
3603 status
= usb_autoresume_device(udev
);
3605 /* Let the drivers do their thing, then... */
3606 usb_autosuspend_device(udev
);
3614 static int check_ports_changed(struct usb_hub
*hub
)
3618 for (port1
= 1; port1
<= hub
->hdev
->maxchild
; ++port1
) {
3619 u16 portstatus
, portchange
;
3622 status
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
3623 if (!status
&& portchange
)
3629 static int hub_suspend(struct usb_interface
*intf
, pm_message_t msg
)
3631 struct usb_hub
*hub
= usb_get_intfdata (intf
);
3632 struct usb_device
*hdev
= hub
->hdev
;
3637 * Warn if children aren't already suspended.
3638 * Also, add up the number of wakeup-enabled descendants.
3640 hub
->wakeup_enabled_descendants
= 0;
3641 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
3642 struct usb_device
*udev
;
3644 udev
= hub
->ports
[port1
- 1]->child
;
3645 if (udev
&& udev
->can_submit
) {
3646 dev_warn(&intf
->dev
, "port %d nyet suspended\n", port1
);
3647 if (PMSG_IS_AUTO(msg
))
3651 hub
->wakeup_enabled_descendants
+=
3652 wakeup_enabled_descendants(udev
);
3655 if (hdev
->do_remote_wakeup
&& hub
->quirk_check_port_auto_suspend
) {
3656 /* check if there are changes pending on hub ports */
3657 if (check_ports_changed(hub
)) {
3658 if (PMSG_IS_AUTO(msg
))
3660 pm_wakeup_event(&hdev
->dev
, 2000);
3664 if (hub_is_superspeed(hdev
) && hdev
->do_remote_wakeup
) {
3665 /* Enable hub to send remote wakeup for all ports. */
3666 for (port1
= 1; port1
<= hdev
->maxchild
; port1
++) {
3667 status
= set_port_feature(hdev
,
3669 USB_PORT_FEAT_REMOTE_WAKE_CONNECT
|
3670 USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT
|
3671 USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT
,
3672 USB_PORT_FEAT_REMOTE_WAKE_MASK
);
3676 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3678 /* stop khubd and related activity */
3679 hub_quiesce(hub
, HUB_SUSPEND
);
3683 static int hub_resume(struct usb_interface
*intf
)
3685 struct usb_hub
*hub
= usb_get_intfdata(intf
);
3687 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3688 hub_activate(hub
, HUB_RESUME
);
3692 static int hub_reset_resume(struct usb_interface
*intf
)
3694 struct usb_hub
*hub
= usb_get_intfdata(intf
);
3696 dev_dbg(&intf
->dev
, "%s\n", __func__
);
3697 hub_activate(hub
, HUB_RESET_RESUME
);
3702 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
3703 * @rhdev: struct usb_device for the root hub
3705 * The USB host controller driver calls this function when its root hub
3706 * is resumed and Vbus power has been interrupted or the controller
3707 * has been reset. The routine marks @rhdev as having lost power.
3708 * When the hub driver is resumed it will take notice and carry out
3709 * power-session recovery for all the "USB-PERSIST"-enabled child devices;
3710 * the others will be disconnected.
3712 void usb_root_hub_lost_power(struct usb_device
*rhdev
)
3714 dev_warn(&rhdev
->dev
, "root hub lost power or was reset\n");
3715 rhdev
->reset_resume
= 1;
3717 EXPORT_SYMBOL_GPL(usb_root_hub_lost_power
);
3719 static const char * const usb3_lpm_names
[] = {
3727 * Send a Set SEL control transfer to the device, prior to enabling
3728 * device-initiated U1 or U2. This lets the device know the exit latencies from
3729 * the time the device initiates a U1 or U2 exit, to the time it will receive a
3730 * packet from the host.
3732 * This function will fail if the SEL or PEL values for udev are greater than
3733 * the maximum allowed values for the link state to be enabled.
3735 static int usb_req_set_sel(struct usb_device
*udev
, enum usb3_link_state state
)
3737 struct usb_set_sel_req
*sel_values
;
3738 unsigned long long u1_sel
;
3739 unsigned long long u1_pel
;
3740 unsigned long long u2_sel
;
3741 unsigned long long u2_pel
;
3744 /* Convert SEL and PEL stored in ns to us */
3745 u1_sel
= DIV_ROUND_UP(udev
->u1_params
.sel
, 1000);
3746 u1_pel
= DIV_ROUND_UP(udev
->u1_params
.pel
, 1000);
3747 u2_sel
= DIV_ROUND_UP(udev
->u2_params
.sel
, 1000);
3748 u2_pel
= DIV_ROUND_UP(udev
->u2_params
.pel
, 1000);
3751 * Make sure that the calculated SEL and PEL values for the link
3752 * state we're enabling aren't bigger than the max SEL/PEL
3753 * value that will fit in the SET SEL control transfer.
3754 * Otherwise the device would get an incorrect idea of the exit
3755 * latency for the link state, and could start a device-initiated
3756 * U1/U2 when the exit latencies are too high.
3758 if ((state
== USB3_LPM_U1
&&
3759 (u1_sel
> USB3_LPM_MAX_U1_SEL_PEL
||
3760 u1_pel
> USB3_LPM_MAX_U1_SEL_PEL
)) ||
3761 (state
== USB3_LPM_U2
&&
3762 (u2_sel
> USB3_LPM_MAX_U2_SEL_PEL
||
3763 u2_pel
> USB3_LPM_MAX_U2_SEL_PEL
))) {
3764 dev_dbg(&udev
->dev
, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n",
3765 usb3_lpm_names
[state
], u1_sel
, u1_pel
);
3770 * If we're enabling device-initiated LPM for one link state,
3771 * but the other link state has a too high SEL or PEL value,
3772 * just set those values to the max in the Set SEL request.
3774 if (u1_sel
> USB3_LPM_MAX_U1_SEL_PEL
)
3775 u1_sel
= USB3_LPM_MAX_U1_SEL_PEL
;
3777 if (u1_pel
> USB3_LPM_MAX_U1_SEL_PEL
)
3778 u1_pel
= USB3_LPM_MAX_U1_SEL_PEL
;
3780 if (u2_sel
> USB3_LPM_MAX_U2_SEL_PEL
)
3781 u2_sel
= USB3_LPM_MAX_U2_SEL_PEL
;
3783 if (u2_pel
> USB3_LPM_MAX_U2_SEL_PEL
)
3784 u2_pel
= USB3_LPM_MAX_U2_SEL_PEL
;
3787 * usb_enable_lpm() can be called as part of a failed device reset,
3788 * which may be initiated by an error path of a mass storage driver.
3789 * Therefore, use GFP_NOIO.
3791 sel_values
= kmalloc(sizeof *(sel_values
), GFP_NOIO
);
3795 sel_values
->u1_sel
= u1_sel
;
3796 sel_values
->u1_pel
= u1_pel
;
3797 sel_values
->u2_sel
= cpu_to_le16(u2_sel
);
3798 sel_values
->u2_pel
= cpu_to_le16(u2_pel
);
3800 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3804 sel_values
, sizeof *(sel_values
),
3805 USB_CTRL_SET_TIMEOUT
);
3811 * Enable or disable device-initiated U1 or U2 transitions.
3813 static int usb_set_device_initiated_lpm(struct usb_device
*udev
,
3814 enum usb3_link_state state
, bool enable
)
3821 feature
= USB_DEVICE_U1_ENABLE
;
3824 feature
= USB_DEVICE_U2_ENABLE
;
3827 dev_warn(&udev
->dev
, "%s: Can't %s non-U1 or U2 state.\n",
3828 __func__
, enable
? "enable" : "disable");
3832 if (udev
->state
!= USB_STATE_CONFIGURED
) {
3833 dev_dbg(&udev
->dev
, "%s: Can't %s %s state "
3834 "for unconfigured device.\n",
3835 __func__
, enable
? "enable" : "disable",
3836 usb3_lpm_names
[state
]);
3842 * Now send the control transfer to enable device-initiated LPM
3843 * for either U1 or U2.
3845 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3846 USB_REQ_SET_FEATURE
,
3850 USB_CTRL_SET_TIMEOUT
);
3852 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
3853 USB_REQ_CLEAR_FEATURE
,
3857 USB_CTRL_SET_TIMEOUT
);
3860 dev_warn(&udev
->dev
, "%s of device-initiated %s failed.\n",
3861 enable
? "Enable" : "Disable",
3862 usb3_lpm_names
[state
]);
3868 static int usb_set_lpm_timeout(struct usb_device
*udev
,
3869 enum usb3_link_state state
, int timeout
)
3876 feature
= USB_PORT_FEAT_U1_TIMEOUT
;
3879 feature
= USB_PORT_FEAT_U2_TIMEOUT
;
3882 dev_warn(&udev
->dev
, "%s: Can't set timeout for non-U1 or U2 state.\n",
3887 if (state
== USB3_LPM_U1
&& timeout
> USB3_LPM_U1_MAX_TIMEOUT
&&
3888 timeout
!= USB3_LPM_DEVICE_INITIATED
) {
3889 dev_warn(&udev
->dev
, "Failed to set %s timeout to 0x%x, "
3890 "which is a reserved value.\n",
3891 usb3_lpm_names
[state
], timeout
);
3895 ret
= set_port_feature(udev
->parent
,
3896 USB_PORT_LPM_TIMEOUT(timeout
) | udev
->portnum
,
3899 dev_warn(&udev
->dev
, "Failed to set %s timeout to 0x%x,"
3900 "error code %i\n", usb3_lpm_names
[state
],
3904 if (state
== USB3_LPM_U1
)
3905 udev
->u1_params
.timeout
= timeout
;
3907 udev
->u2_params
.timeout
= timeout
;
3912 * Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated
3915 * We will attempt to enable U1 or U2, but there are no guarantees that the
3916 * control transfers to set the hub timeout or enable device-initiated U1/U2
3917 * will be successful.
3919 * If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI
3920 * driver know about it. If that call fails, it should be harmless, and just
3921 * take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency.
3923 static void usb_enable_link_state(struct usb_hcd
*hcd
, struct usb_device
*udev
,
3924 enum usb3_link_state state
)
3927 __u8 u1_mel
= udev
->bos
->ss_cap
->bU1devExitLat
;
3928 __le16 u2_mel
= udev
->bos
->ss_cap
->bU2DevExitLat
;
3930 /* If the device says it doesn't have *any* exit latency to come out of
3931 * U1 or U2, it's probably lying. Assume it doesn't implement that link
3934 if ((state
== USB3_LPM_U1
&& u1_mel
== 0) ||
3935 (state
== USB3_LPM_U2
&& u2_mel
== 0))
3939 * First, let the device know about the exit latencies
3940 * associated with the link state we're about to enable.
3942 ret
= usb_req_set_sel(udev
, state
);
3944 dev_warn(&udev
->dev
, "Set SEL for device-initiated %s failed.\n",
3945 usb3_lpm_names
[state
]);
3949 /* We allow the host controller to set the U1/U2 timeout internally
3950 * first, so that it can change its schedule to account for the
3951 * additional latency to send data to a device in a lower power
3954 timeout
= hcd
->driver
->enable_usb3_lpm_timeout(hcd
, udev
, state
);
3956 /* xHCI host controller doesn't want to enable this LPM state. */
3961 dev_warn(&udev
->dev
, "Could not enable %s link state, "
3962 "xHCI error %i.\n", usb3_lpm_names
[state
],
3967 if (usb_set_lpm_timeout(udev
, state
, timeout
))
3968 /* If we can't set the parent hub U1/U2 timeout,
3969 * device-initiated LPM won't be allowed either, so let the xHCI
3970 * host know that this link state won't be enabled.
3972 hcd
->driver
->disable_usb3_lpm_timeout(hcd
, udev
, state
);
3974 /* Only a configured device will accept the Set Feature U1/U2_ENABLE */
3975 else if (udev
->actconfig
)
3976 usb_set_device_initiated_lpm(udev
, state
, true);
3981 * Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated
3984 * If this function returns -EBUSY, the parent hub will still allow U1/U2 entry.
3985 * If zero is returned, the parent will not allow the link to go into U1/U2.
3987 * If zero is returned, device-initiated U1/U2 entry may still be enabled, but
3988 * it won't have an effect on the bus link state because the parent hub will
3989 * still disallow device-initiated U1/U2 entry.
3991 * If zero is returned, the xHCI host controller may still think U1/U2 entry is
3992 * possible. The result will be slightly more bus bandwidth will be taken up
3993 * (to account for U1/U2 exit latency), but it should be harmless.
3995 static int usb_disable_link_state(struct usb_hcd
*hcd
, struct usb_device
*udev
,
3996 enum usb3_link_state state
)
4002 feature
= USB_PORT_FEAT_U1_TIMEOUT
;
4005 feature
= USB_PORT_FEAT_U2_TIMEOUT
;
4008 dev_warn(&udev
->dev
, "%s: Can't disable non-U1 or U2 state.\n",
4013 if (usb_set_lpm_timeout(udev
, state
, 0))
4016 usb_set_device_initiated_lpm(udev
, state
, false);
4018 if (hcd
->driver
->disable_usb3_lpm_timeout(hcd
, udev
, state
))
4019 dev_warn(&udev
->dev
, "Could not disable xHCI %s timeout, "
4020 "bus schedule bandwidth may be impacted.\n",
4021 usb3_lpm_names
[state
]);
4026 * Disable hub-initiated and device-initiated U1 and U2 entry.
4027 * Caller must own the bandwidth_mutex.
4029 * This will call usb_enable_lpm() on failure, which will decrement
4030 * lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero.
4032 int usb_disable_lpm(struct usb_device
*udev
)
4034 struct usb_hcd
*hcd
;
4036 if (!udev
|| !udev
->parent
||
4037 udev
->speed
!= USB_SPEED_SUPER
||
4041 hcd
= bus_to_hcd(udev
->bus
);
4042 if (!hcd
|| !hcd
->driver
->disable_usb3_lpm_timeout
)
4045 udev
->lpm_disable_count
++;
4046 if ((udev
->u1_params
.timeout
== 0 && udev
->u2_params
.timeout
== 0))
4049 /* If LPM is enabled, attempt to disable it. */
4050 if (usb_disable_link_state(hcd
, udev
, USB3_LPM_U1
))
4052 if (usb_disable_link_state(hcd
, udev
, USB3_LPM_U2
))
4058 usb_enable_lpm(udev
);
4061 EXPORT_SYMBOL_GPL(usb_disable_lpm
);
4063 /* Grab the bandwidth_mutex before calling usb_disable_lpm() */
4064 int usb_unlocked_disable_lpm(struct usb_device
*udev
)
4066 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
4072 mutex_lock(hcd
->bandwidth_mutex
);
4073 ret
= usb_disable_lpm(udev
);
4074 mutex_unlock(hcd
->bandwidth_mutex
);
4078 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm
);
4081 * Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The
4082 * xHCI host policy may prevent U1 or U2 from being enabled.
4084 * Other callers may have disabled link PM, so U1 and U2 entry will be disabled
4085 * until the lpm_disable_count drops to zero. Caller must own the
4088 void usb_enable_lpm(struct usb_device
*udev
)
4090 struct usb_hcd
*hcd
;
4092 if (!udev
|| !udev
->parent
||
4093 udev
->speed
!= USB_SPEED_SUPER
||
4097 udev
->lpm_disable_count
--;
4098 hcd
= bus_to_hcd(udev
->bus
);
4099 /* Double check that we can both enable and disable LPM.
4100 * Device must be configured to accept set feature U1/U2 timeout.
4102 if (!hcd
|| !hcd
->driver
->enable_usb3_lpm_timeout
||
4103 !hcd
->driver
->disable_usb3_lpm_timeout
)
4106 if (udev
->lpm_disable_count
> 0)
4109 usb_enable_link_state(hcd
, udev
, USB3_LPM_U1
);
4110 usb_enable_link_state(hcd
, udev
, USB3_LPM_U2
);
4112 EXPORT_SYMBOL_GPL(usb_enable_lpm
);
4114 /* Grab the bandwidth_mutex before calling usb_enable_lpm() */
4115 void usb_unlocked_enable_lpm(struct usb_device
*udev
)
4117 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
4122 mutex_lock(hcd
->bandwidth_mutex
);
4123 usb_enable_lpm(udev
);
4124 mutex_unlock(hcd
->bandwidth_mutex
);
4126 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm
);
4129 #else /* CONFIG_PM */
4131 #define hub_suspend NULL
4132 #define hub_resume NULL
4133 #define hub_reset_resume NULL
4135 int usb_disable_lpm(struct usb_device
*udev
)
4139 EXPORT_SYMBOL_GPL(usb_disable_lpm
);
4141 void usb_enable_lpm(struct usb_device
*udev
) { }
4142 EXPORT_SYMBOL_GPL(usb_enable_lpm
);
4144 int usb_unlocked_disable_lpm(struct usb_device
*udev
)
4148 EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm
);
4150 void usb_unlocked_enable_lpm(struct usb_device
*udev
) { }
4151 EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm
);
4153 int usb_disable_ltm(struct usb_device
*udev
)
4157 EXPORT_SYMBOL_GPL(usb_disable_ltm
);
4159 void usb_enable_ltm(struct usb_device
*udev
) { }
4160 EXPORT_SYMBOL_GPL(usb_enable_ltm
);
4164 /* USB 2.0 spec, 7.1.7.3 / fig 7-29:
4166 * Between connect detection and reset signaling there must be a delay
4167 * of 100ms at least for debounce and power-settling. The corresponding
4168 * timer shall restart whenever the downstream port detects a disconnect.
4170 * Apparently there are some bluetooth and irda-dongles and a number of
4171 * low-speed devices for which this debounce period may last over a second.
4172 * Not covered by the spec - but easy to deal with.
4174 * This implementation uses a 1500ms total debounce timeout; if the
4175 * connection isn't stable by then it returns -ETIMEDOUT. It checks
4176 * every 25ms for transient disconnects. When the port status has been
4177 * unchanged for 100ms it returns the port status.
4179 int hub_port_debounce(struct usb_hub
*hub
, int port1
, bool must_be_connected
)
4182 int total_time
, stable_time
= 0;
4183 u16 portchange
, portstatus
;
4184 unsigned connection
= 0xffff;
4186 for (total_time
= 0; ; total_time
+= HUB_DEBOUNCE_STEP
) {
4187 ret
= hub_port_status(hub
, port1
, &portstatus
, &portchange
);
4191 if (!(portchange
& USB_PORT_STAT_C_CONNECTION
) &&
4192 (portstatus
& USB_PORT_STAT_CONNECTION
) == connection
) {
4193 if (!must_be_connected
||
4194 (connection
== USB_PORT_STAT_CONNECTION
))
4195 stable_time
+= HUB_DEBOUNCE_STEP
;
4196 if (stable_time
>= HUB_DEBOUNCE_STABLE
)
4200 connection
= portstatus
& USB_PORT_STAT_CONNECTION
;
4203 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
4204 usb_clear_port_feature(hub
->hdev
, port1
,
4205 USB_PORT_FEAT_C_CONNECTION
);
4208 if (total_time
>= HUB_DEBOUNCE_TIMEOUT
)
4210 msleep(HUB_DEBOUNCE_STEP
);
4213 dev_dbg (hub
->intfdev
,
4214 "debounce: port %d: total %dms stable %dms status 0x%x\n",
4215 port1
, total_time
, stable_time
, portstatus
);
4217 if (stable_time
< HUB_DEBOUNCE_STABLE
)
4222 void usb_ep0_reinit(struct usb_device
*udev
)
4224 usb_disable_endpoint(udev
, 0 + USB_DIR_IN
, true);
4225 usb_disable_endpoint(udev
, 0 + USB_DIR_OUT
, true);
4226 usb_enable_endpoint(udev
, &udev
->ep0
, true);
4228 EXPORT_SYMBOL_GPL(usb_ep0_reinit
);
4231 static int hub_set_address(struct usb_device
*udev
, int devnum
)
4234 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
4237 * The host controller will choose the device address,
4238 * instead of the core having chosen it earlier
4240 if (!hcd
->driver
->address_device
&& devnum
<= 1)
4242 if (udev
->state
== USB_STATE_ADDRESS
)
4244 if (udev
->state
!= USB_STATE_DEFAULT
)
4246 if (hcd
->driver
->address_device
)
4247 retval
= hcd
->driver
->address_device(hcd
, udev
);
4249 retval
= usb_control_msg(udev
, usb_sndaddr0pipe(),
4250 USB_REQ_SET_ADDRESS
, 0, devnum
, 0,
4251 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
4253 update_devnum(udev
, devnum
);
4254 /* Device now using proper address. */
4255 usb_set_device_state(udev
, USB_STATE_ADDRESS
);
4256 usb_ep0_reinit(udev
);
4261 /* Reset device, (re)assign address, get device descriptor.
4262 * Device connection must be stable, no more debouncing needed.
4263 * Returns device in USB_STATE_ADDRESS, except on error.
4265 * If this is called for an already-existing device (as part of
4266 * usb_reset_and_verify_device), the caller must own the device lock. For a
4267 * newly detected device that is not accessible through any global
4268 * pointers, it's not necessary to lock the device.
4271 hub_port_init (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
,
4274 static DEFINE_MUTEX(usb_address0_mutex
);
4276 struct usb_device
*hdev
= hub
->hdev
;
4277 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
4279 unsigned delay
= HUB_SHORT_RESET_TIME
;
4280 enum usb_device_speed oldspeed
= udev
->speed
;
4282 int devnum
= udev
->devnum
;
4285 /* root hub ports have a slightly longer reset period
4286 * (from USB 2.0 spec, section 7.1.7.5)
4288 if (!hdev
->parent
) {
4289 delay
= HUB_ROOT_RESET_TIME
;
4290 if (port1
== hdev
->bus
->otg_port
)
4291 hdev
->bus
->b_hnp_enable
= 0;
4294 /* Some low speed devices have problems with the quick delay, so */
4295 /* be a bit pessimistic with those devices. RHbug #23670 */
4296 if (oldspeed
== USB_SPEED_LOW
)
4297 delay
= HUB_LONG_RESET_TIME
;
4299 mutex_lock(&usb_address0_mutex
);
4301 /* Reset the device; full speed may morph to high speed */
4302 /* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */
4304 retval
= hub_port_reset(hub
, port1
, udev
, delay
, false);
4306 if (retval
< 0) /* error or disconnect */
4308 /* success, speed is known */
4312 if (oldspeed
!= USB_SPEED_UNKNOWN
&& oldspeed
!= udev
->speed
) {
4313 dev_dbg(&udev
->dev
, "device reset changed speed!\n");
4316 oldspeed
= udev
->speed
;
4318 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
4319 * it's fixed size except for full speed devices.
4320 * For Wireless USB devices, ep0 max packet is always 512 (tho
4321 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
4323 switch (udev
->speed
) {
4324 case USB_SPEED_SUPER
:
4325 case USB_SPEED_WIRELESS
: /* fixed at 512 */
4326 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(512);
4328 case USB_SPEED_HIGH
: /* fixed at 64 */
4329 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
4331 case USB_SPEED_FULL
: /* 8, 16, 32, or 64 */
4332 /* to determine the ep0 maxpacket size, try to read
4333 * the device descriptor to get bMaxPacketSize0 and
4334 * then correct our initial guess.
4336 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(64);
4338 case USB_SPEED_LOW
: /* fixed at 8 */
4339 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(8);
4346 if (udev
->speed
== USB_SPEED_WIRELESS
)
4347 speed
= "variable speed Wireless";
4349 speed
= usb_speed_string(udev
->speed
);
4351 if (udev
->speed
!= USB_SPEED_SUPER
)
4352 dev_info(&udev
->dev
,
4353 "%s %s USB device number %d using %s\n",
4354 (udev
->config
) ? "reset" : "new", speed
,
4355 devnum
, udev
->bus
->controller
->driver
->name
);
4357 /* Set up TT records, if needed */
4359 udev
->tt
= hdev
->tt
;
4360 udev
->ttport
= hdev
->ttport
;
4361 } else if (udev
->speed
!= USB_SPEED_HIGH
4362 && hdev
->speed
== USB_SPEED_HIGH
) {
4364 dev_err(&udev
->dev
, "parent hub has no TT\n");
4368 udev
->tt
= &hub
->tt
;
4369 udev
->ttport
= port1
;
4372 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
4373 * Because device hardware and firmware is sometimes buggy in
4374 * this area, and this is how Linux has done it for ages.
4375 * Change it cautiously.
4377 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
4378 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
4379 * so it may help with some non-standards-compliant devices.
4380 * Otherwise we start with SET_ADDRESS and then try to read the
4381 * first 8 bytes of the device descriptor to get the ep0 maxpacket
4384 for (i
= 0; i
< GET_DESCRIPTOR_TRIES
; (++i
, msleep(100))) {
4386 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
)) {
4387 struct usb_device_descriptor
*buf
;
4390 #define GET_DESCRIPTOR_BUFSIZE 64
4391 buf
= kmalloc(GET_DESCRIPTOR_BUFSIZE
, GFP_NOIO
);
4397 /* Retry on all errors; some devices are flakey.
4398 * 255 is for WUSB devices, we actually need to use
4399 * 512 (WUSB1.0[4.8.1]).
4401 for (j
= 0; j
< 3; ++j
) {
4402 buf
->bMaxPacketSize0
= 0;
4403 r
= usb_control_msg(udev
, usb_rcvaddr0pipe(),
4404 USB_REQ_GET_DESCRIPTOR
, USB_DIR_IN
,
4405 USB_DT_DEVICE
<< 8, 0,
4406 buf
, GET_DESCRIPTOR_BUFSIZE
,
4407 initial_descriptor_timeout
);
4408 switch (buf
->bMaxPacketSize0
) {
4409 case 8: case 16: case 32: case 64: case 255:
4410 if (buf
->bDescriptorType
==
4422 * Some devices time out if they are powered on
4423 * when already connected. They need a second
4424 * reset. But only on the first attempt,
4425 * lest we get into a time out/reset loop
4427 if (r
== 0 || (r
== -ETIMEDOUT
&& j
== 0))
4430 #if defined(CONFIG_USBIF_COMPLIANCE) && defined(CONFIG_USB_XHCI_HCD)
4431 if (buf
->bMaxPacketSize0
== 0) {
4432 usbif_u3h_send_event("DEV_CONN_TMOUT");
4437 udev
->descriptor
.bMaxPacketSize0
=
4438 buf
->bMaxPacketSize0
;
4441 retval
= hub_port_reset(hub
, port1
, udev
, delay
, false);
4442 if (retval
< 0) /* error or disconnect */
4444 if (oldspeed
!= udev
->speed
) {
4446 "device reset changed speed!\n");
4452 dev_err(&udev
->dev
, "device descriptor read/64, error %d\n",
4457 #undef GET_DESCRIPTOR_BUFSIZE
4461 * If device is WUSB, we already assigned an
4462 * unauthorized address in the Connect Ack sequence;
4463 * authorization will assign the final address.
4465 if (udev
->wusb
== 0) {
4466 for (j
= 0; j
< SET_ADDRESS_TRIES
; ++j
) {
4467 retval
= hub_set_address(udev
, devnum
);
4473 if (retval
!= -ENODEV
)
4474 dev_err(&udev
->dev
, "device not accepting address %d, error %d\n",
4478 if (udev
->speed
== USB_SPEED_SUPER
) {
4479 devnum
= udev
->devnum
;
4480 dev_info(&udev
->dev
,
4481 "%s SuperSpeed USB device number %d using %s\n",
4482 (udev
->config
) ? "reset" : "new",
4483 devnum
, udev
->bus
->controller
->driver
->name
);
4486 /* cope with hardware quirkiness:
4487 * - let SET_ADDRESS settle, some device hardware wants it
4488 * - read ep0 maxpacket even for high and low speed,
4491 if (USE_NEW_SCHEME(retry_counter
) && !(hcd
->driver
->flags
& HCD_USB3
))
4495 retval
= usb_get_device_descriptor(udev
, 8);
4497 if (retval
!= -ENODEV
)
4499 "device descriptor read/8, error %d\n",
4511 if (hcd
->phy
&& !hdev
->parent
)
4512 usb_phy_notify_connect(hcd
->phy
, udev
->speed
);
4515 * Some superspeed devices have finished the link training process
4516 * and attached to a superspeed hub port, but the device descriptor
4517 * got from those devices show they aren't superspeed devices. Warm
4518 * reset the port attached by the devices can fix them.
4520 if ((udev
->speed
== USB_SPEED_SUPER
) &&
4521 (le16_to_cpu(udev
->descriptor
.bcdUSB
) < 0x0300)) {
4522 dev_err(&udev
->dev
, "got a wrong device descriptor, "
4523 "warm reset device\n");
4524 hub_port_reset(hub
, port1
, udev
,
4525 HUB_BH_RESET_TIME
, true);
4530 if (udev
->descriptor
.bMaxPacketSize0
== 0xff ||
4531 udev
->speed
== USB_SPEED_SUPER
)
4534 i
= udev
->descriptor
.bMaxPacketSize0
;
4535 if (usb_endpoint_maxp(&udev
->ep0
.desc
) != i
) {
4536 if (udev
->speed
== USB_SPEED_LOW
||
4537 !(i
== 8 || i
== 16 || i
== 32 || i
== 64)) {
4538 dev_err(&udev
->dev
, "Invalid ep0 maxpacket: %d\n", i
);
4542 if (udev
->speed
== USB_SPEED_FULL
)
4543 dev_dbg(&udev
->dev
, "ep0 maxpacket = %d\n", i
);
4545 dev_warn(&udev
->dev
, "Using ep0 maxpacket: %d\n", i
);
4546 udev
->ep0
.desc
.wMaxPacketSize
= cpu_to_le16(i
);
4547 usb_ep0_reinit(udev
);
4550 retval
= usb_get_device_descriptor(udev
, USB_DT_DEVICE_SIZE
);
4551 if (retval
< (signed)sizeof(udev
->descriptor
)) {
4552 if (retval
!= -ENODEV
)
4553 dev_err(&udev
->dev
, "device descriptor read/all, error %d\n",
4560 usb_detect_quirks(udev
);
4562 if (udev
->wusb
== 0 && le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0201) {
4563 retval
= usb_get_bos_descriptor(udev
);
4565 udev
->lpm_capable
= usb_device_supports_lpm(udev
);
4566 usb_set_lpm_parameters(udev
);
4571 /* notify HCD that we have a device connected and addressed */
4572 if (hcd
->driver
->update_device
)
4573 hcd
->driver
->update_device(hcd
, udev
);
4576 hub_port_disable(hub
, port1
, 0);
4577 update_devnum(udev
, devnum
); /* for disconnect processing */
4579 mutex_unlock(&usb_address0_mutex
);
4584 check_highspeed (struct usb_hub
*hub
, struct usb_device
*udev
, int port1
)
4586 struct usb_qualifier_descriptor
*qual
;
4589 qual
= kmalloc (sizeof *qual
, GFP_KERNEL
);
4593 status
= usb_get_descriptor (udev
, USB_DT_DEVICE_QUALIFIER
, 0,
4594 qual
, sizeof *qual
);
4595 if (status
== sizeof *qual
) {
4596 dev_info(&udev
->dev
, "not running at top speed; "
4597 "connect to a high speed hub\n");
4598 /* hub LEDs are probably harder to miss than syslog */
4599 if (hub
->has_indicators
) {
4600 hub
->indicator
[port1
-1] = INDICATOR_GREEN_BLINK
;
4601 schedule_delayed_work (&hub
->leds
, 0);
4608 hub_power_remaining (struct usb_hub
*hub
)
4610 struct usb_device
*hdev
= hub
->hdev
;
4614 if (!hub
->limited_power
)
4617 remaining
= hdev
->bus_mA
- hub
->descriptor
->bHubContrCurrent
;
4618 for (port1
= 1; port1
<= hdev
->maxchild
; ++port1
) {
4619 struct usb_device
*udev
= hub
->ports
[port1
- 1]->child
;
4625 if (hub_is_superspeed(udev
))
4631 * Unconfigured devices may not use more than one unit load,
4632 * or 8mA for OTG ports
4634 if (udev
->actconfig
)
4635 delta
= usb_get_max_power(udev
, udev
->actconfig
);
4636 else if (port1
!= udev
->bus
->otg_port
|| hdev
->parent
)
4640 if (delta
> hub
->mA_per_port
)
4641 dev_warn(&udev
->dev
,
4642 "%dmA is over %umA budget for port %d!\n",
4643 delta
, hub
->mA_per_port
, port1
);
4646 if (remaining
< 0) {
4647 #if defined(CONFIG_USBIF_COMPLIANCE) && defined(CONFIG_USB_XHCI_HCD)
4648 usbif_u3h_send_event("DEV_OVER_CURRENT");
4650 dev_warn(hub
->intfdev
, "%dmA over power budget!\n",
4657 /* Handle physical or logical connection change events.
4658 * This routine is called when:
4659 * a port connection-change occurs;
4660 * a port enable-change occurs (often caused by EMI);
4661 * usb_reset_and_verify_device() encounters changed descriptors (as from
4662 * a firmware download)
4663 * caller already locked the hub
4665 static void hub_port_connect_change(struct usb_hub
*hub
, int port1
,
4666 u16 portstatus
, u16 portchange
)
4668 struct usb_device
*hdev
= hub
->hdev
;
4669 struct device
*hub_dev
= hub
->intfdev
;
4670 struct usb_hcd
*hcd
= bus_to_hcd(hdev
->bus
);
4671 unsigned wHubCharacteristics
=
4672 le16_to_cpu(hub
->descriptor
->wHubCharacteristics
);
4673 struct usb_device
*udev
;
4679 "port %d, status %04x, change %04x, %s\n",
4680 port1
, portstatus
, portchange
, portspeed(hub
, portstatus
));
4682 if (hub
->has_indicators
) {
4683 set_port_led(hub
, port1
, HUB_LED_AUTO
);
4684 hub
->indicator
[port1
-1] = INDICATOR_AUTO
;
4687 #ifdef CONFIG_USB_OTG
4688 /* during HNP, don't repeat the debounce */
4689 if (hdev
->bus
->is_b_host
)
4690 portchange
&= ~(USB_PORT_STAT_C_CONNECTION
|
4691 USB_PORT_STAT_C_ENABLE
);
4694 /* Try to resuscitate an existing device */
4695 udev
= hub
->ports
[port1
- 1]->child
;
4696 if ((portstatus
& USB_PORT_STAT_CONNECTION
) && udev
&&
4697 udev
->state
!= USB_STATE_NOTATTACHED
) {
4698 usb_lock_device(udev
);
4699 if (portstatus
& USB_PORT_STAT_ENABLE
) {
4700 status
= 0; /* Nothing to do */
4702 #ifdef CONFIG_PM_RUNTIME
4703 } else if (udev
->state
== USB_STATE_SUSPENDED
&&
4704 udev
->persist_enabled
) {
4705 /* For a suspended device, treat this as a
4706 * remote wakeup event.
4708 status
= usb_remote_wakeup(udev
);
4712 status
= -ENODEV
; /* Don't resuscitate */
4714 usb_unlock_device(udev
);
4717 clear_bit(port1
, hub
->change_bits
);
4722 /* Disconnect any existing devices under this port */
4724 if (hcd
->phy
&& !hdev
->parent
&&
4725 !(portstatus
& USB_PORT_STAT_CONNECTION
))
4726 usb_phy_notify_disconnect(hcd
->phy
, udev
->speed
);
4727 usb_disconnect(&hub
->ports
[port1
- 1]->child
);
4729 clear_bit(port1
, hub
->change_bits
);
4731 /* We can forget about a "removed" device when there's a physical
4732 * disconnect or the connect status changes.
4734 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
4735 (portchange
& USB_PORT_STAT_C_CONNECTION
))
4736 clear_bit(port1
, hub
->removed_bits
);
4738 if (portchange
& (USB_PORT_STAT_C_CONNECTION
|
4739 USB_PORT_STAT_C_ENABLE
)) {
4740 status
= hub_port_debounce_be_stable(hub
, port1
);
4742 if (status
!= -ENODEV
&& printk_ratelimit())
4743 dev_err(hub_dev
, "connect-debounce failed, "
4744 "port %d disabled\n", port1
);
4745 portstatus
&= ~USB_PORT_STAT_CONNECTION
;
4747 portstatus
= status
;
4751 /* Return now if debouncing failed or nothing is connected or
4752 * the device was "removed".
4754 if (!(portstatus
& USB_PORT_STAT_CONNECTION
) ||
4755 test_bit(port1
, hub
->removed_bits
)) {
4757 /* maybe switch power back on (e.g. root hub was reset) */
4758 if ((wHubCharacteristics
& HUB_CHAR_LPSM
) < 2
4759 && !port_is_power_on(hub
, portstatus
))
4760 set_port_feature(hdev
, port1
, USB_PORT_FEAT_POWER
);
4762 if (portstatus
& USB_PORT_STAT_ENABLE
)
4766 if (hub_is_superspeed(hub
->hdev
))
4772 for (i
= 0; i
< SET_CONFIG_TRIES
; i
++) {
4774 /* reallocate for each attempt, since references
4775 * to the previous one can escape in various ways
4777 udev
= usb_alloc_dev(hdev
, hdev
->bus
, port1
);
4780 "couldn't allocate port %d usb_device\n",
4785 usb_set_device_state(udev
, USB_STATE_POWERED
);
4786 udev
->bus_mA
= hub
->mA_per_port
;
4787 udev
->level
= hdev
->level
+ 1;
4788 udev
->wusb
= hub_is_wusb(hub
);
4790 /* Only USB 3.0 devices are connected to SuperSpeed hubs. */
4791 if (hub_is_superspeed(hub
->hdev
))
4792 udev
->speed
= USB_SPEED_SUPER
;
4794 udev
->speed
= USB_SPEED_UNKNOWN
;
4796 choose_devnum(udev
);
4797 if (udev
->devnum
<= 0) {
4798 status
= -ENOTCONN
; /* Don't retry */
4802 /* reset (non-USB 3.0 devices) and get descriptor */
4804 status
= hub_port_init(hub
, udev
, port1
, i
);
4812 if (udev
->quirks
& USB_QUIRK_DELAY_INIT
)
4815 /* consecutive bus-powered hubs aren't reliable; they can
4816 * violate the voltage drop budget. if the new child has
4817 * a "powered" LED, users should notice we didn't enable it
4818 * (without reading syslog), even without per-port LEDs
4821 if (udev
->descriptor
.bDeviceClass
== USB_CLASS_HUB
4822 && udev
->bus_mA
<= unit_load
) {
4825 status
= usb_get_status(udev
, USB_RECIP_DEVICE
, 0,
4828 dev_dbg(&udev
->dev
, "get status %d ?\n", status
);
4831 le16_to_cpus(&devstat
);
4832 if ((devstat
& (1 << USB_DEVICE_SELF_POWERED
)) == 0) {
4834 "can't connect bus-powered hub "
4836 if (hub
->has_indicators
) {
4837 hub
->indicator
[port1
-1] =
4838 INDICATOR_AMBER_BLINK
;
4839 schedule_delayed_work (&hub
->leds
, 0);
4841 status
= -ENOTCONN
; /* Don't retry */
4846 /* check for devices running slower than they could */
4847 if (le16_to_cpu(udev
->descriptor
.bcdUSB
) >= 0x0200
4848 && udev
->speed
== USB_SPEED_FULL
4849 && highspeed_hubs
!= 0)
4850 check_highspeed (hub
, udev
, port1
);
4852 /* Store the parent's children[] pointer. At this point
4853 * udev becomes globally accessible, although presumably
4854 * no one will look at it until hdev is unlocked.
4858 /* We mustn't add new devices if the parent hub has
4859 * been disconnected; we would race with the
4860 * recursively_mark_NOTATTACHED() routine.
4862 spin_lock_irq(&device_state_lock
);
4863 if (hdev
->state
== USB_STATE_NOTATTACHED
)
4866 hub
->ports
[port1
- 1]->child
= udev
;
4867 spin_unlock_irq(&device_state_lock
);
4869 /* Run it through the hoops (find a driver, etc) */
4871 status
= usb_new_device(udev
);
4873 spin_lock_irq(&device_state_lock
);
4874 hub
->ports
[port1
- 1]->child
= NULL
;
4875 spin_unlock_irq(&device_state_lock
);
4877 #ifdef CONFIG_MTK_DT_USB_SUPPORT
4879 MYDBG("get new device !!!, BUILD TIME : %s, g_dsda_dev : %p\n", __TIME__
, g_dsda_dev
);
4886 status
= hub_power_remaining(hub
);
4888 dev_dbg(hub_dev
, "%dmA power budget left\n", status
);
4893 hub_port_disable(hub
, port1
, 1);
4895 usb_ep0_reinit(udev
);
4896 release_devnum(udev
);
4899 if ((status
== -ENOTCONN
) || (status
== -ENOTSUPP
))
4902 if (hub
->hdev
->parent
||
4903 !hcd
->driver
->port_handed_over
||
4904 !(hcd
->driver
->port_handed_over
)(hcd
, port1
)) {
4905 if (status
!= -ENOTCONN
&& status
!= -ENODEV
)
4906 dev_err(hub_dev
, "unable to enumerate USB device on port %d\n",
4911 hub_port_disable(hub
, port1
, 1);
4912 if (hcd
->driver
->relinquish_port
&& !hub
->hdev
->parent
)
4913 hcd
->driver
->relinquish_port(hcd
, port1
);
4916 /* Returns 1 if there was a remote wakeup and a connect status change. */
4917 static int hub_handle_remote_wakeup(struct usb_hub
*hub
, unsigned int port
,
4918 u16 portstatus
, u16 portchange
)
4920 struct usb_device
*hdev
;
4921 struct usb_device
*udev
;
4922 int connect_change
= 0;
4926 udev
= hub
->ports
[port
- 1]->child
;
4927 if (!hub_is_superspeed(hdev
)) {
4928 if (!(portchange
& USB_PORT_STAT_C_SUSPEND
))
4930 usb_clear_port_feature(hdev
, port
, USB_PORT_FEAT_C_SUSPEND
);
4932 if (!udev
|| udev
->state
!= USB_STATE_SUSPENDED
||
4933 (portstatus
& USB_PORT_STAT_LINK_STATE
) !=
4939 /* TRSMRCY = 10 msec */
4942 usb_lock_device(udev
);
4943 ret
= usb_remote_wakeup(udev
);
4944 usb_unlock_device(udev
);
4949 hub_port_disable(hub
, port
, 1);
4951 dev_dbg(hub
->intfdev
, "resume on port %d, status %d\n",
4953 return connect_change
;
4956 static void hub_events(void)
4958 struct list_head
*tmp
;
4959 struct usb_device
*hdev
;
4960 struct usb_interface
*intf
;
4961 struct usb_hub
*hub
;
4962 struct device
*hub_dev
;
4968 int connect_change
, wakeup_change
;
4971 * We restart the list every time to avoid a deadlock with
4972 * deleting hubs downstream from this one. This should be
4973 * safe since we delete the hub from the event list.
4974 * Not the most efficient, but avoids deadlocks.
4978 /* Grab the first entry at the beginning of the list */
4979 spin_lock_irq(&hub_event_lock
);
4980 if (list_empty(&hub_event_list
)) {
4981 spin_unlock_irq(&hub_event_lock
);
4985 tmp
= hub_event_list
.next
;
4988 hub
= list_entry(tmp
, struct usb_hub
, event_list
);
4989 kref_get(&hub
->kref
);
4992 spin_unlock_irq(&hub_event_lock
);
4994 hub_dev
= hub
->intfdev
;
4995 intf
= to_usb_interface(hub_dev
);
4996 dev_dbg(hub_dev
, "state %d ports %d chg %04x evt %04x\n",
4997 hdev
->state
, hub
->descriptor
4998 ? hub
->descriptor
->bNbrPorts
5000 /* NOTE: expects max 15 ports... */
5001 (u16
) hub
->change_bits
[0],
5002 (u16
) hub
->event_bits
[0]);
5004 /* Lock the device, then check to see if we were
5005 * disconnected while waiting for the lock to succeed. */
5006 usb_lock_device(hdev
);
5007 if (unlikely(hub
->disconnected
))
5008 goto loop_disconnected
;
5010 /* If the hub has died, clean up after it */
5011 if (hdev
->state
== USB_STATE_NOTATTACHED
) {
5012 hub
->error
= -ENODEV
;
5013 hub_quiesce(hub
, HUB_DISCONNECT
);
5018 ret
= usb_autopm_get_interface(intf
);
5020 dev_dbg(hub_dev
, "Can't autoresume: %d\n", ret
);
5024 /* If this is an inactive hub, do nothing */
5029 dev_dbg (hub_dev
, "resetting for error %d\n",
5033 ret
= usb_reset_device(hdev
);
5036 "error resetting hub: %d\n", ret
);
5044 /* deal with port status changes */
5045 for (i
= 1; i
<= hub
->descriptor
->bNbrPorts
; i
++) {
5046 if (test_bit(i
, hub
->busy_bits
))
5048 connect_change
= test_bit(i
, hub
->change_bits
);
5049 wakeup_change
= test_and_clear_bit(i
, hub
->wakeup_bits
);
5050 if (!test_and_clear_bit(i
, hub
->event_bits
) &&
5051 !connect_change
&& !wakeup_change
)
5054 ret
= hub_port_status(hub
, i
,
5055 &portstatus
, &portchange
);
5059 if (portchange
& USB_PORT_STAT_C_CONNECTION
) {
5060 usb_clear_port_feature(hdev
, i
,
5061 USB_PORT_FEAT_C_CONNECTION
);
5065 if (portchange
& USB_PORT_STAT_C_ENABLE
) {
5066 if (!connect_change
)
5068 "port %d enable change, "
5071 usb_clear_port_feature(hdev
, i
,
5072 USB_PORT_FEAT_C_ENABLE
);
5075 * EM interference sometimes causes badly
5076 * shielded USB devices to be shutdown by
5077 * the hub, this hack enables them again.
5078 * Works at least with mouse driver.
5080 if (!(portstatus
& USB_PORT_STAT_ENABLE
)
5082 && hub
->ports
[i
- 1]->child
) {
5085 "disabled by hub (EMI?), "
5092 if (hub_handle_remote_wakeup(hub
, i
,
5093 portstatus
, portchange
))
5096 if (portchange
& USB_PORT_STAT_C_OVERCURRENT
) {
5100 dev_dbg(hub_dev
, "over-current change on port "
5102 usb_clear_port_feature(hdev
, i
,
5103 USB_PORT_FEAT_C_OVER_CURRENT
);
5104 msleep(100); /* Cool down */
5105 hub_power_on(hub
, true);
5106 hub_port_status(hub
, i
, &status
, &unused
);
5107 if (status
& USB_PORT_STAT_OVERCURRENT
)
5108 dev_err(hub_dev
, "over-current "
5109 "condition on port %d\n", i
);
5112 if (portchange
& USB_PORT_STAT_C_RESET
) {
5114 "reset change on port %d\n",
5116 usb_clear_port_feature(hdev
, i
,
5117 USB_PORT_FEAT_C_RESET
);
5119 if ((portchange
& USB_PORT_STAT_C_BH_RESET
) &&
5120 hub_is_superspeed(hub
->hdev
)) {
5122 "warm reset change on port %d\n",
5124 usb_clear_port_feature(hdev
, i
,
5125 USB_PORT_FEAT_C_BH_PORT_RESET
);
5127 if (portchange
& USB_PORT_STAT_C_LINK_STATE
) {
5128 usb_clear_port_feature(hub
->hdev
, i
,
5129 USB_PORT_FEAT_C_PORT_LINK_STATE
);
5131 if (portchange
& USB_PORT_STAT_C_CONFIG_ERROR
) {
5133 "config error on port %d\n",
5135 usb_clear_port_feature(hub
->hdev
, i
,
5136 USB_PORT_FEAT_C_PORT_CONFIG_ERROR
);
5139 /* Warm reset a USB3 protocol port if it's in
5140 * SS.Inactive state.
5142 if (hub_port_warm_reset_required(hub
, portstatus
)) {
5144 struct usb_device
*udev
=
5145 hub
->ports
[i
- 1]->child
;
5147 dev_dbg(hub_dev
, "warm reset port %d\n", i
);
5149 !(portstatus
& USB_PORT_STAT_CONNECTION
) ||
5150 udev
->state
== USB_STATE_NOTATTACHED
) {
5151 status
= hub_port_reset(hub
, i
,
5152 NULL
, HUB_BH_RESET_TIME
,
5155 hub_port_disable(hub
, i
, 1);
5157 usb_lock_device(udev
);
5158 status
= usb_reset_device(udev
);
5159 usb_unlock_device(udev
);
5165 hub_port_connect_change(hub
, i
,
5166 portstatus
, portchange
);
5169 /* deal with hub status changes */
5170 if (test_and_clear_bit(0, hub
->event_bits
) == 0)
5172 else if (hub_hub_status(hub
, &hubstatus
, &hubchange
) < 0)
5173 dev_err (hub_dev
, "get_hub_status failed\n");
5175 if (hubchange
& HUB_CHANGE_LOCAL_POWER
) {
5176 dev_dbg (hub_dev
, "power change\n");
5177 clear_hub_feature(hdev
, C_HUB_LOCAL_POWER
);
5178 if (hubstatus
& HUB_STATUS_LOCAL_POWER
)
5179 /* FIXME: Is this always true? */
5180 hub
->limited_power
= 1;
5182 hub
->limited_power
= 0;
5184 if (hubchange
& HUB_CHANGE_OVERCURRENT
) {
5188 dev_dbg(hub_dev
, "over-current change\n");
5189 clear_hub_feature(hdev
, C_HUB_OVER_CURRENT
);
5190 msleep(500); /* Cool down */
5191 hub_power_on(hub
, true);
5192 hub_hub_status(hub
, &status
, &unused
);
5193 if (status
& HUB_STATUS_OVERCURRENT
)
5194 dev_err(hub_dev
, "over-current "
5200 /* Balance the usb_autopm_get_interface() above */
5201 usb_autopm_put_interface_no_suspend(intf
);
5203 /* Balance the usb_autopm_get_interface_no_resume() in
5204 * kick_khubd() and allow autosuspend.
5206 usb_autopm_put_interface(intf
);
5208 usb_unlock_device(hdev
);
5210 kref_put(&hub
->kref
, hub_release
);
5212 } /* end while (1) */
5215 static int hub_thread(void *__unused
)
5217 /* khubd needs to be freezable to avoid intefering with USB-PERSIST
5218 * port handover. Otherwise it might see that a full-speed device
5219 * was gone before the EHCI controller had handed its port over to
5220 * the companion full-speed controller.
5226 wait_event_freezable(khubd_wait
,
5227 !list_empty(&hub_event_list
) ||
5228 kthread_should_stop());
5229 } while (!kthread_should_stop() || !list_empty(&hub_event_list
));
5231 pr_debug("%s: khubd exiting\n", usbcore_name
);
5235 static const struct usb_device_id hub_id_table
[] = {
5236 { .match_flags
= USB_DEVICE_ID_MATCH_VENDOR
5237 | USB_DEVICE_ID_MATCH_INT_CLASS
,
5238 .idVendor
= USB_VENDOR_GENESYS_LOGIC
,
5239 .bInterfaceClass
= USB_CLASS_HUB
,
5240 .driver_info
= HUB_QUIRK_CHECK_PORT_AUTOSUSPEND
},
5241 { .match_flags
= USB_DEVICE_ID_MATCH_DEV_CLASS
,
5242 .bDeviceClass
= USB_CLASS_HUB
},
5243 { .match_flags
= USB_DEVICE_ID_MATCH_INT_CLASS
,
5244 .bInterfaceClass
= USB_CLASS_HUB
},
5245 { } /* Terminating entry */
5248 MODULE_DEVICE_TABLE (usb
, hub_id_table
);
5250 static struct usb_driver hub_driver
= {
5253 .disconnect
= hub_disconnect
,
5254 .suspend
= hub_suspend
,
5255 .resume
= hub_resume
,
5256 .reset_resume
= hub_reset_resume
,
5257 .pre_reset
= hub_pre_reset
,
5258 .post_reset
= hub_post_reset
,
5259 .unlocked_ioctl
= hub_ioctl
,
5260 .id_table
= hub_id_table
,
5261 .supports_autosuspend
= 1,
5264 #if defined(CONFIG_MTK_XHCI) && defined(CONFIG_USB_MTK_DUALMODE)
5265 extern void mtk_hub_event_steal(spinlock_t
*lock
, struct list_head
* list
);
5267 int usb_hub_init(void)
5269 if (usb_register(&hub_driver
) < 0) {
5270 printk(KERN_ERR
"%s: can't register hub driver\n",
5275 #if defined(CONFIG_MTK_XHCI) && defined(CONFIG_USB_MTK_DUALMODE)
5276 mtk_hub_event_steal(&hub_event_lock
, &hub_event_list
);
5279 khubd_task
= kthread_run(hub_thread
, NULL
, "khubd");
5280 if (!IS_ERR(khubd_task
))
5283 /* Fall through if kernel_thread failed */
5284 usb_deregister(&hub_driver
);
5285 printk(KERN_ERR
"%s: can't start khubd\n", usbcore_name
);
5290 void usb_hub_cleanup(void)
5292 kthread_stop(khubd_task
);
5295 * Hub resources are freed for us by usb_deregister. It calls
5296 * usb_driver_purge on every device which in turn calls that
5297 * devices disconnect function if it is using this driver.
5298 * The hub_disconnect function takes care of releasing the
5299 * individual hub resources. -greg
5301 usb_deregister(&hub_driver
);
5302 } /* usb_hub_cleanup() */
5304 static int descriptors_changed(struct usb_device
*udev
,
5305 struct usb_device_descriptor
*old_device_descriptor
)
5309 unsigned serial_len
= 0;
5311 unsigned old_length
;
5315 if (memcmp(&udev
->descriptor
, old_device_descriptor
,
5316 sizeof(*old_device_descriptor
)) != 0)
5319 /* Since the idVendor, idProduct, and bcdDevice values in the
5320 * device descriptor haven't changed, we will assume the
5321 * Manufacturer and Product strings haven't changed either.
5322 * But the SerialNumber string could be different (e.g., a
5323 * different flash card of the same brand).
5326 serial_len
= strlen(udev
->serial
) + 1;
5329 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
5330 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
5331 len
= max(len
, old_length
);
5334 buf
= kmalloc(len
, GFP_NOIO
);
5336 dev_err(&udev
->dev
, "no mem to re-read configs after reset\n");
5337 /* assume the worst */
5340 for (index
= 0; index
< udev
->descriptor
.bNumConfigurations
; index
++) {
5341 old_length
= le16_to_cpu(udev
->config
[index
].desc
.wTotalLength
);
5342 length
= usb_get_descriptor(udev
, USB_DT_CONFIG
, index
, buf
,
5344 if (length
!= old_length
) {
5345 dev_dbg(&udev
->dev
, "config index %d, error %d\n",
5350 if (memcmp (buf
, udev
->rawdescriptors
[index
], old_length
)
5352 dev_dbg(&udev
->dev
, "config index %d changed (#%d)\n",
5354 ((struct usb_config_descriptor
*) buf
)->
5355 bConfigurationValue
);
5361 if (!changed
&& serial_len
) {
5362 length
= usb_string(udev
, udev
->descriptor
.iSerialNumber
,
5364 if (length
+ 1 != serial_len
) {
5365 dev_dbg(&udev
->dev
, "serial string error %d\n",
5368 } else if (memcmp(buf
, udev
->serial
, length
) != 0) {
5369 dev_dbg(&udev
->dev
, "serial string changed\n");
5379 * usb_reset_and_verify_device - perform a USB port reset to reinitialize a device
5380 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5382 * WARNING - don't use this routine to reset a composite device
5383 * (one with multiple interfaces owned by separate drivers)!
5384 * Use usb_reset_device() instead.
5386 * Do a port reset, reassign the device's address, and establish its
5387 * former operating configuration. If the reset fails, or the device's
5388 * descriptors change from their values before the reset, or the original
5389 * configuration and altsettings cannot be restored, a flag will be set
5390 * telling khubd to pretend the device has been disconnected and then
5391 * re-connected. All drivers will be unbound, and the device will be
5392 * re-enumerated and probed all over again.
5394 * Returns 0 if the reset succeeded, -ENODEV if the device has been
5395 * flagged for logical disconnection, or some other negative error code
5396 * if the reset wasn't even attempted.
5398 * The caller must own the device lock. For example, it's safe to use
5399 * this from a driver probe() routine after downloading new firmware.
5400 * For calls that might not occur during probe(), drivers should lock
5401 * the device using usb_lock_device_for_reset().
5403 * Locking exception: This routine may also be called from within an
5404 * autoresume handler. Such usage won't conflict with other tasks
5405 * holding the device lock because these tasks should always call
5406 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
5408 static int usb_reset_and_verify_device(struct usb_device
*udev
)
5410 struct usb_device
*parent_hdev
= udev
->parent
;
5411 struct usb_hub
*parent_hub
;
5412 struct usb_hcd
*hcd
= bus_to_hcd(udev
->bus
);
5413 struct usb_device_descriptor descriptor
= udev
->descriptor
;
5415 int port1
= udev
->portnum
;
5418 if (udev
->state
== USB_STATE_NOTATTACHED
||
5419 udev
->state
== USB_STATE_SUSPENDED
) {
5420 dev_dbg(&udev
->dev
, "device reset not allowed in state %d\n",
5426 /* this requires hcd-specific logic; see ohci_restart() */
5427 dev_dbg(&udev
->dev
, "%s for root hub!\n", __func__
);
5430 parent_hub
= usb_hub_to_struct_hub(parent_hdev
);
5432 /* Disable LPM and LTM while we reset the device and reinstall the alt
5433 * settings. Device-initiated LPM settings, and system exit latency
5434 * settings are cleared when the device is reset, so we have to set
5437 ret
= usb_unlocked_disable_lpm(udev
);
5439 dev_err(&udev
->dev
, "%s Failed to disable LPM\n.", __func__
);
5442 ret
= usb_disable_ltm(udev
);
5444 dev_err(&udev
->dev
, "%s Failed to disable LTM\n.",
5449 set_bit(port1
, parent_hub
->busy_bits
);
5450 for (i
= 0; i
< SET_CONFIG_TRIES
; ++i
) {
5452 /* ep0 maxpacket size may change; let the HCD know about it.
5453 * Other endpoints will be handled by re-enumeration. */
5454 usb_ep0_reinit(udev
);
5455 ret
= hub_port_init(parent_hub
, udev
, port1
, i
);
5456 if (ret
>= 0 || ret
== -ENOTCONN
|| ret
== -ENODEV
)
5459 clear_bit(port1
, parent_hub
->busy_bits
);
5464 /* Device might have changed firmware (DFU or similar) */
5465 if (descriptors_changed(udev
, &descriptor
)) {
5466 dev_info(&udev
->dev
, "device firmware changed\n");
5467 udev
->descriptor
= descriptor
; /* for disconnect() calls */
5471 /* Restore the device's previous configuration */
5472 if (!udev
->actconfig
)
5475 mutex_lock(hcd
->bandwidth_mutex
);
5476 ret
= usb_hcd_alloc_bandwidth(udev
, udev
->actconfig
, NULL
, NULL
);
5478 dev_warn(&udev
->dev
,
5479 "Busted HC? Not enough HCD resources for "
5480 "old configuration.\n");
5481 mutex_unlock(hcd
->bandwidth_mutex
);
5484 ret
= usb_control_msg(udev
, usb_sndctrlpipe(udev
, 0),
5485 USB_REQ_SET_CONFIGURATION
, 0,
5486 udev
->actconfig
->desc
.bConfigurationValue
, 0,
5487 NULL
, 0, USB_CTRL_SET_TIMEOUT
);
5490 "can't restore configuration #%d (error=%d)\n",
5491 udev
->actconfig
->desc
.bConfigurationValue
, ret
);
5492 mutex_unlock(hcd
->bandwidth_mutex
);
5495 mutex_unlock(hcd
->bandwidth_mutex
);
5496 usb_set_device_state(udev
, USB_STATE_CONFIGURED
);
5498 /* Put interfaces back into the same altsettings as before.
5499 * Don't bother to send the Set-Interface request for interfaces
5500 * that were already in altsetting 0; besides being unnecessary,
5501 * many devices can't handle it. Instead just reset the host-side
5504 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
5505 struct usb_host_config
*config
= udev
->actconfig
;
5506 struct usb_interface
*intf
= config
->interface
[i
];
5507 struct usb_interface_descriptor
*desc
;
5509 desc
= &intf
->cur_altsetting
->desc
;
5510 if (desc
->bAlternateSetting
== 0) {
5511 usb_disable_interface(udev
, intf
, true);
5512 usb_enable_interface(udev
, intf
, true);
5515 /* Let the bandwidth allocation function know that this
5516 * device has been reset, and it will have to use
5517 * alternate setting 0 as the current alternate setting.
5519 intf
->resetting_device
= 1;
5520 ret
= usb_set_interface(udev
, desc
->bInterfaceNumber
,
5521 desc
->bAlternateSetting
);
5522 intf
->resetting_device
= 0;
5525 dev_err(&udev
->dev
, "failed to restore interface %d "
5526 "altsetting %d (error=%d)\n",
5527 desc
->bInterfaceNumber
,
5528 desc
->bAlternateSetting
,
5535 /* Now that the alt settings are re-installed, enable LTM and LPM. */
5536 usb_unlocked_enable_lpm(udev
);
5537 usb_enable_ltm(udev
);
5541 /* LPM state doesn't matter when we're about to destroy the device. */
5542 hub_port_logical_disconnect(parent_hub
, port1
);
5547 * usb_reset_device - warn interface drivers and perform a USB port reset
5548 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
5550 * Warns all drivers bound to registered interfaces (using their pre_reset
5551 * method), performs the port reset, and then lets the drivers know that
5552 * the reset is over (using their post_reset method).
5554 * Return value is the same as for usb_reset_and_verify_device().
5556 * The caller must own the device lock. For example, it's safe to use
5557 * this from a driver probe() routine after downloading new firmware.
5558 * For calls that might not occur during probe(), drivers should lock
5559 * the device using usb_lock_device_for_reset().
5561 * If an interface is currently being probed or disconnected, we assume
5562 * its driver knows how to handle resets. For all other interfaces,
5563 * if the driver doesn't have pre_reset and post_reset methods then
5564 * we attempt to unbind it and rebind afterward.
5566 int usb_reset_device(struct usb_device
*udev
)
5570 unsigned int noio_flag
;
5571 struct usb_host_config
*config
= udev
->actconfig
;
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",
5582 * Don't allocate memory with GFP_KERNEL in current
5583 * context to avoid possible deadlock if usb mass
5584 * storage interface or usbnet interface(iSCSI case)
5585 * is included in current configuration. The easist
5586 * approach is to do it for every device reset,
5587 * because the device 'memalloc_noio' flag may have
5588 * not been set before reseting the usb device.
5590 noio_flag
= memalloc_noio_save();
5592 /* Prevent autosuspend during the reset */
5593 usb_autoresume_device(udev
);
5596 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
5597 struct usb_interface
*cintf
= config
->interface
[i
];
5598 struct usb_driver
*drv
;
5601 if (cintf
->dev
.driver
) {
5602 drv
= to_usb_driver(cintf
->dev
.driver
);
5603 if (drv
->pre_reset
&& drv
->post_reset
)
5604 unbind
= (drv
->pre_reset
)(cintf
);
5605 else if (cintf
->condition
==
5606 USB_INTERFACE_BOUND
)
5609 usb_forced_unbind_intf(cintf
);
5614 ret
= usb_reset_and_verify_device(udev
);
5617 for (i
= config
->desc
.bNumInterfaces
- 1; i
>= 0; --i
) {
5618 struct usb_interface
*cintf
= config
->interface
[i
];
5619 struct usb_driver
*drv
;
5620 int rebind
= cintf
->needs_binding
;
5622 if (!rebind
&& cintf
->dev
.driver
) {
5623 drv
= to_usb_driver(cintf
->dev
.driver
);
5624 if (drv
->post_reset
)
5625 rebind
= (drv
->post_reset
)(cintf
);
5626 else if (cintf
->condition
==
5627 USB_INTERFACE_BOUND
)
5630 cintf
->needs_binding
= 1;
5633 usb_unbind_and_rebind_marked_interfaces(udev
);
5636 usb_autosuspend_device(udev
);
5637 memalloc_noio_restore(noio_flag
);
5640 EXPORT_SYMBOL_GPL(usb_reset_device
);
5644 * usb_queue_reset_device - Reset a USB device from an atomic context
5645 * @iface: USB interface belonging to the device to reset
5647 * This function can be used to reset a USB device from an atomic
5648 * context, where usb_reset_device() won't work (as it blocks).
5650 * Doing a reset via this method is functionally equivalent to calling
5651 * usb_reset_device(), except for the fact that it is delayed to a
5652 * workqueue. This means that any drivers bound to other interfaces
5653 * might be unbound, as well as users from usbfs in user space.
5657 * - Scheduling two resets at the same time from two different drivers
5658 * attached to two different interfaces of the same device is
5659 * possible; depending on how the driver attached to each interface
5660 * handles ->pre_reset(), the second reset might happen or not.
5662 * - If a driver is unbound and it had a pending reset, the reset will
5665 * - This function can be called during .probe() or .disconnect()
5666 * times. On return from .disconnect(), any pending resets will be
5669 * There is no no need to lock/unlock the @reset_ws as schedule_work()
5672 * NOTE: We don't do any reference count tracking because it is not
5673 * needed. The lifecycle of the work_struct is tied to the
5674 * usb_interface. Before destroying the interface we cancel the
5675 * work_struct, so the fact that work_struct is queued and or
5676 * running means the interface (and thus, the device) exist and
5679 void usb_queue_reset_device(struct usb_interface
*iface
)
5681 schedule_work(&iface
->reset_ws
);
5683 EXPORT_SYMBOL_GPL(usb_queue_reset_device
);
5686 * usb_hub_find_child - Get the pointer of child device
5687 * attached to the port which is specified by @port1.
5688 * @hdev: USB device belonging to the usb hub
5689 * @port1: port num to indicate which port the child device
5692 * USB drivers call this function to get hub's child device
5695 * Return NULL if input param is invalid and
5696 * child's usb_device pointer if non-NULL.
5698 struct usb_device
*usb_hub_find_child(struct usb_device
*hdev
,
5701 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5703 if (port1
< 1 || port1
> hdev
->maxchild
)
5705 return hub
->ports
[port1
- 1]->child
;
5707 EXPORT_SYMBOL_GPL(usb_hub_find_child
);
5710 * usb_set_hub_port_connect_type - set hub port connect type.
5711 * @hdev: USB device belonging to the usb hub
5712 * @port1: port num of the port
5713 * @type: connect type of the port
5715 void usb_set_hub_port_connect_type(struct usb_device
*hdev
, int port1
,
5716 enum usb_port_connect_type type
)
5718 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5720 hub
->ports
[port1
- 1]->connect_type
= type
;
5724 * usb_get_hub_port_connect_type - Get the port's connect type
5725 * @hdev: USB device belonging to the usb hub
5726 * @port1: port num of the port
5728 * Return connect type of the port and if input params are
5729 * invalid, return USB_PORT_CONNECT_TYPE_UNKNOWN.
5731 enum usb_port_connect_type
5732 usb_get_hub_port_connect_type(struct usb_device
*hdev
, int port1
)
5734 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5736 return hub
->ports
[port1
- 1]->connect_type
;
5739 void usb_hub_adjust_deviceremovable(struct usb_device
*hdev
,
5740 struct usb_hub_descriptor
*desc
)
5742 enum usb_port_connect_type connect_type
;
5745 if (!hub_is_superspeed(hdev
)) {
5746 for (i
= 1; i
<= hdev
->maxchild
; i
++) {
5747 connect_type
= usb_get_hub_port_connect_type(hdev
, i
);
5749 if (connect_type
== USB_PORT_CONNECT_TYPE_HARD_WIRED
) {
5750 u8 mask
= 1 << (i
%8);
5752 if (!(desc
->u
.hs
.DeviceRemovable
[i
/8] & mask
)) {
5753 dev_dbg(&hdev
->dev
, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n",
5755 desc
->u
.hs
.DeviceRemovable
[i
/8] |= mask
;
5760 u16 port_removable
= le16_to_cpu(desc
->u
.ss
.DeviceRemovable
);
5762 for (i
= 1; i
<= hdev
->maxchild
; i
++) {
5763 connect_type
= usb_get_hub_port_connect_type(hdev
, i
);
5765 if (connect_type
== USB_PORT_CONNECT_TYPE_HARD_WIRED
) {
5768 if (!(port_removable
& mask
)) {
5769 dev_dbg(&hdev
->dev
, "usb port%d's DeviceRemovable is changed to 1 according to platform information.\n",
5771 port_removable
|= mask
;
5776 desc
->u
.ss
.DeviceRemovable
= cpu_to_le16(port_removable
);
5782 * usb_get_hub_port_acpi_handle - Get the usb port's acpi handle
5783 * @hdev: USB device belonging to the usb hub
5784 * @port1: port num of the port
5786 * Return port's acpi handle if successful, NULL if params are
5789 acpi_handle
usb_get_hub_port_acpi_handle(struct usb_device
*hdev
,
5792 struct usb_hub
*hub
= usb_hub_to_struct_hub(hdev
);
5794 return DEVICE_ACPI_HANDLE(&hub
->ports
[port1
- 1]->dev
);