1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * USB HID support for Linux
5 * Copyright (c) 1999 Andreas Gal
6 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
7 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
8 * Copyright (c) 2007-2008 Oliver Neukum
9 * Copyright (c) 2006-2010 Jiri Kosina
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/list.h>
21 #include <linux/mutex.h>
22 #include <linux/spinlock.h>
23 #include <asm/unaligned.h>
24 #include <asm/byteorder.h>
25 #include <linux/input.h>
26 #include <linux/wait.h>
27 #include <linux/workqueue.h>
28 #include <linux/string.h>
30 #include <linux/usb.h>
32 #include <linux/hid.h>
33 #include <linux/hiddev.h>
34 #include <linux/hid-debug.h>
35 #include <linux/hidraw.h>
42 #define DRIVER_DESC "USB HID core driver"
48 static unsigned int hid_mousepoll_interval;
49 module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
50 MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
52 static unsigned int hid_jspoll_interval;
53 module_param_named(jspoll, hid_jspoll_interval, uint, 0644);
54 MODULE_PARM_DESC(jspoll, "Polling interval of joysticks");
56 static unsigned int hid_kbpoll_interval;
57 module_param_named(kbpoll, hid_kbpoll_interval, uint, 0644);
58 MODULE_PARM_DESC(kbpoll, "Polling interval of keyboards");
60 static unsigned int ignoreled;
61 module_param_named(ignoreled, ignoreled, uint, 0644);
62 MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
64 /* Quirks specified at module load time */
65 static char *quirks_param[MAX_USBHID_BOOT_QUIRKS];
66 module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
67 MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
68 " quirks=vendorID:productID:quirks"
69 " where vendorID, productID, and quirks are all in"
72 * Input submission and I/O error handler.
74 static void hid_io_error(struct hid_device *hid);
75 static int hid_submit_out(struct hid_device *hid);
76 static int hid_submit_ctrl(struct hid_device *hid);
77 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid);
79 /* Start up the input URB */
80 static int hid_start_in(struct hid_device *hid)
84 struct usbhid_device *usbhid = hid->driver_data;
86 spin_lock_irqsave(&usbhid->lock, flags);
87 if (test_bit(HID_IN_POLLING, &usbhid->iofl) &&
88 !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
89 !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
90 !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
91 rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
93 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
95 set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
97 clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
100 spin_unlock_irqrestore(&usbhid->lock, flags);
104 /* I/O retry timer routine */
105 static void hid_retry_timeout(struct timer_list *t)
107 struct usbhid_device *usbhid = from_timer(usbhid, t, io_retry);
108 struct hid_device *hid = usbhid->hid;
110 dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
111 if (hid_start_in(hid))
115 /* Workqueue routine to reset the device or clear a halt */
116 static void hid_reset(struct work_struct *work)
118 struct usbhid_device *usbhid =
119 container_of(work, struct usbhid_device, reset_work);
120 struct hid_device *hid = usbhid->hid;
123 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
124 dev_dbg(&usbhid->intf->dev, "clear halt\n");
125 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
126 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
130 dev_dbg(&usbhid->intf->dev,
131 "clear-halt failed: %d\n", rc);
132 set_bit(HID_RESET_PENDING, &usbhid->iofl);
136 if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
137 dev_dbg(&usbhid->intf->dev, "resetting device\n");
138 usb_queue_reset_device(usbhid->intf);
142 /* Main I/O error handler */
143 static void hid_io_error(struct hid_device *hid)
146 struct usbhid_device *usbhid = hid->driver_data;
148 spin_lock_irqsave(&usbhid->lock, flags);
150 /* Stop when disconnected */
151 if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
154 /* If it has been a while since the last error, we'll assume
155 * this a brand new error and reset the retry timeout. */
156 if (time_after(jiffies, usbhid->stop_retry + HZ/2))
157 usbhid->retry_delay = 0;
159 /* When an error occurs, retry at increasing intervals */
160 if (usbhid->retry_delay == 0) {
161 usbhid->retry_delay = 13; /* Then 26, 52, 104, 104, ... */
162 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
163 } else if (usbhid->retry_delay < 100)
164 usbhid->retry_delay *= 2;
166 if (time_after(jiffies, usbhid->stop_retry)) {
168 /* Retries failed, so do a port reset unless we lack bandwidth*/
169 if (!test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
170 && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
172 schedule_work(&usbhid->reset_work);
177 mod_timer(&usbhid->io_retry,
178 jiffies + msecs_to_jiffies(usbhid->retry_delay));
180 spin_unlock_irqrestore(&usbhid->lock, flags);
183 static void usbhid_mark_busy(struct usbhid_device *usbhid)
185 struct usb_interface *intf = usbhid->intf;
187 usb_mark_last_busy(interface_to_usbdev(intf));
190 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
192 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
196 if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
197 test_bit(HID_SUSPENDED, &usbhid->iofl))
200 if ((kicked = (usbhid->outhead != usbhid->outtail))) {
201 hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
203 /* Try to wake up from autosuspend... */
204 r = usb_autopm_get_interface_async(usbhid->intf);
209 * If still suspended, don't submit. Submission will
210 * occur if/when resume drains the queue.
212 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
213 usb_autopm_put_interface_no_suspend(usbhid->intf);
217 /* Asynchronously flush queue. */
218 set_bit(HID_OUT_RUNNING, &usbhid->iofl);
219 if (hid_submit_out(hid)) {
220 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
221 usb_autopm_put_interface_async(usbhid->intf);
223 wake_up(&usbhid->wait);
228 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
230 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
234 WARN_ON(hid == NULL);
235 if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
236 test_bit(HID_SUSPENDED, &usbhid->iofl))
239 if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
240 hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
242 /* Try to wake up from autosuspend... */
243 r = usb_autopm_get_interface_async(usbhid->intf);
248 * If still suspended, don't submit. Submission will
249 * occur if/when resume drains the queue.
251 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
252 usb_autopm_put_interface_no_suspend(usbhid->intf);
256 /* Asynchronously flush queue. */
257 set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
258 if (hid_submit_ctrl(hid)) {
259 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
260 usb_autopm_put_interface_async(usbhid->intf);
262 wake_up(&usbhid->wait);
268 * Input interrupt completion handler.
271 static void hid_irq_in(struct urb *urb)
273 struct hid_device *hid = urb->context;
274 struct usbhid_device *usbhid = hid->driver_data;
277 switch (urb->status) {
278 case 0: /* success */
279 usbhid->retry_delay = 0;
280 if (!test_bit(HID_OPENED, &usbhid->iofl))
282 usbhid_mark_busy(usbhid);
283 if (!test_bit(HID_RESUME_RUNNING, &usbhid->iofl)) {
284 hid_input_report(urb->context, HID_INPUT_REPORT,
285 urb->transfer_buffer,
286 urb->actual_length, 1);
288 * autosuspend refused while keys are pressed
289 * because most keyboards don't wake up when
292 if (hid_check_keys_pressed(hid))
293 set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
295 clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
298 case -EPIPE: /* stall */
299 usbhid_mark_busy(usbhid);
300 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
301 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
302 schedule_work(&usbhid->reset_work);
304 case -ECONNRESET: /* unlink */
306 case -ESHUTDOWN: /* unplug */
307 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
309 case -EILSEQ: /* protocol error or unplug */
310 case -EPROTO: /* protocol error or unplug */
311 case -ETIME: /* protocol error or unplug */
312 case -ETIMEDOUT: /* Should never happen, but... */
313 usbhid_mark_busy(usbhid);
314 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
318 hid_warn(urb->dev, "input irq status %d received\n",
322 status = usb_submit_urb(urb, GFP_ATOMIC);
324 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
325 if (status != -EPERM) {
326 hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
327 hid_to_usb_dev(hid)->bus->bus_name,
328 hid_to_usb_dev(hid)->devpath,
329 usbhid->ifnum, status);
335 static int hid_submit_out(struct hid_device *hid)
337 struct hid_report *report;
339 struct usbhid_device *usbhid = hid->driver_data;
342 report = usbhid->out[usbhid->outtail].report;
343 raw_report = usbhid->out[usbhid->outtail].raw_report;
345 usbhid->urbout->transfer_buffer_length = hid_report_len(report);
346 usbhid->urbout->dev = hid_to_usb_dev(hid);
348 memcpy(usbhid->outbuf, raw_report,
349 usbhid->urbout->transfer_buffer_length);
351 usbhid->out[usbhid->outtail].raw_report = NULL;
354 dbg_hid("submitting out urb\n");
356 r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
358 hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
361 usbhid->last_out = jiffies;
365 static int hid_submit_ctrl(struct hid_device *hid)
367 struct hid_report *report;
371 struct usbhid_device *usbhid = hid->driver_data;
373 report = usbhid->ctrl[usbhid->ctrltail].report;
374 raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
375 dir = usbhid->ctrl[usbhid->ctrltail].dir;
377 len = hid_report_len(report);
378 if (dir == USB_DIR_OUT) {
379 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
381 memcpy(usbhid->ctrlbuf, raw_report, len);
383 usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
388 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
389 maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
390 usbhid->urbctrl->pipe, 0);
391 len += (len == 0); /* Don't allow 0-length reports */
392 len = round_up(len, maxpacket);
393 if (len > usbhid->bufsize)
394 len = usbhid->bufsize;
396 usbhid->urbctrl->transfer_buffer_length = len;
397 usbhid->urbctrl->dev = hid_to_usb_dev(hid);
399 usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
400 usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
402 usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
404 usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
405 usbhid->cr->wLength = cpu_to_le16(len);
407 dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
408 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
410 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
412 r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
414 hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
417 usbhid->last_ctrl = jiffies;
422 * Output interrupt completion handler.
425 static void hid_irq_out(struct urb *urb)
427 struct hid_device *hid = urb->context;
428 struct usbhid_device *usbhid = hid->driver_data;
432 switch (urb->status) {
433 case 0: /* success */
435 case -ESHUTDOWN: /* unplug */
438 case -EILSEQ: /* protocol error or unplug */
439 case -EPROTO: /* protocol error or unplug */
440 case -ECONNRESET: /* unlink */
444 hid_warn(urb->dev, "output irq status %d received\n",
448 spin_lock_irqsave(&usbhid->lock, flags);
451 usbhid->outtail = usbhid->outhead;
453 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
455 if (usbhid->outhead != usbhid->outtail &&
456 hid_submit_out(hid) == 0) {
457 /* Successfully submitted next urb in queue */
458 spin_unlock_irqrestore(&usbhid->lock, flags);
463 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
464 spin_unlock_irqrestore(&usbhid->lock, flags);
465 usb_autopm_put_interface_async(usbhid->intf);
466 wake_up(&usbhid->wait);
470 * Control pipe completion handler.
473 static void hid_ctrl(struct urb *urb)
475 struct hid_device *hid = urb->context;
476 struct usbhid_device *usbhid = hid->driver_data;
478 int unplug = 0, status = urb->status;
481 case 0: /* success */
482 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
483 hid_input_report(urb->context,
484 usbhid->ctrl[usbhid->ctrltail].report->type,
485 urb->transfer_buffer, urb->actual_length, 0);
487 case -ESHUTDOWN: /* unplug */
490 case -EILSEQ: /* protocol error or unplug */
491 case -EPROTO: /* protocol error or unplug */
492 case -ECONNRESET: /* unlink */
494 case -EPIPE: /* report not available */
497 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
500 spin_lock_irqsave(&usbhid->lock, flags);
503 usbhid->ctrltail = usbhid->ctrlhead;
504 } else if (usbhid->ctrlhead != usbhid->ctrltail) {
505 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
507 if (usbhid->ctrlhead != usbhid->ctrltail &&
508 hid_submit_ctrl(hid) == 0) {
509 /* Successfully submitted next urb in queue */
510 spin_unlock_irqrestore(&usbhid->lock, flags);
515 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
516 spin_unlock_irqrestore(&usbhid->lock, flags);
517 usb_autopm_put_interface_async(usbhid->intf);
518 wake_up(&usbhid->wait);
521 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
525 struct usbhid_device *usbhid = hid->driver_data;
527 if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
528 test_bit(HID_DISCONNECTED, &usbhid->iofl))
531 if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
532 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
533 hid_warn(hid, "output queue full\n");
537 usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
538 if (!usbhid->out[usbhid->outhead].raw_report) {
539 hid_warn(hid, "output queueing failed\n");
542 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
543 usbhid->out[usbhid->outhead].report = report;
544 usbhid->outhead = head;
546 /* If the queue isn't running, restart it */
547 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
548 usbhid_restart_out_queue(usbhid);
550 /* Otherwise see if an earlier request has timed out */
551 } else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
553 /* Prevent autosuspend following the unlink */
554 usb_autopm_get_interface_no_resume(usbhid->intf);
557 * Prevent resubmission in case the URB completes
558 * before we can unlink it. We don't want to cancel
559 * the wrong transfer!
561 usb_block_urb(usbhid->urbout);
563 /* Drop lock to avoid deadlock if the callback runs */
564 spin_unlock(&usbhid->lock);
566 usb_unlink_urb(usbhid->urbout);
567 spin_lock(&usbhid->lock);
568 usb_unblock_urb(usbhid->urbout);
570 /* Unlink might have stopped the queue */
571 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
572 usbhid_restart_out_queue(usbhid);
574 /* Now we can allow autosuspend again */
575 usb_autopm_put_interface_async(usbhid->intf);
580 if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
581 hid_warn(hid, "control queue full\n");
585 if (dir == USB_DIR_OUT) {
586 usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
587 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
588 hid_warn(hid, "control queueing failed\n");
591 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
593 usbhid->ctrl[usbhid->ctrlhead].report = report;
594 usbhid->ctrl[usbhid->ctrlhead].dir = dir;
595 usbhid->ctrlhead = head;
597 /* If the queue isn't running, restart it */
598 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
599 usbhid_restart_ctrl_queue(usbhid);
601 /* Otherwise see if an earlier request has timed out */
602 } else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
604 /* Prevent autosuspend following the unlink */
605 usb_autopm_get_interface_no_resume(usbhid->intf);
608 * Prevent resubmission in case the URB completes
609 * before we can unlink it. We don't want to cancel
610 * the wrong transfer!
612 usb_block_urb(usbhid->urbctrl);
614 /* Drop lock to avoid deadlock if the callback runs */
615 spin_unlock(&usbhid->lock);
617 usb_unlink_urb(usbhid->urbctrl);
618 spin_lock(&usbhid->lock);
619 usb_unblock_urb(usbhid->urbctrl);
621 /* Unlink might have stopped the queue */
622 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
623 usbhid_restart_ctrl_queue(usbhid);
625 /* Now we can allow autosuspend again */
626 usb_autopm_put_interface_async(usbhid->intf);
630 static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
632 struct usbhid_device *usbhid = hid->driver_data;
635 spin_lock_irqsave(&usbhid->lock, flags);
636 __usbhid_submit_report(hid, report, dir);
637 spin_unlock_irqrestore(&usbhid->lock, flags);
640 static int usbhid_wait_io(struct hid_device *hid)
642 struct usbhid_device *usbhid = hid->driver_data;
644 if (!wait_event_timeout(usbhid->wait,
645 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
646 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
648 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
655 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
657 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
658 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
659 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
662 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
663 unsigned char type, void *buf, int size)
665 int result, retries = 4;
667 memset(buf, 0, size);
670 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
671 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
672 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
674 } while (result < size && retries);
678 static int usbhid_open(struct hid_device *hid)
680 struct usbhid_device *usbhid = hid->driver_data;
683 mutex_lock(&usbhid->mutex);
685 set_bit(HID_OPENED, &usbhid->iofl);
687 if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
692 res = usb_autopm_get_interface(usbhid->intf);
693 /* the device must be awake to reliably request remote wakeup */
695 clear_bit(HID_OPENED, &usbhid->iofl);
700 usbhid->intf->needs_remote_wakeup = 1;
702 set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
703 set_bit(HID_IN_POLLING, &usbhid->iofl);
705 res = hid_start_in(hid);
707 if (res != -ENOSPC) {
711 /* no use opening if resources are insufficient */
713 clear_bit(HID_OPENED, &usbhid->iofl);
714 clear_bit(HID_IN_POLLING, &usbhid->iofl);
715 usbhid->intf->needs_remote_wakeup = 0;
719 usb_autopm_put_interface(usbhid->intf);
722 * In case events are generated while nobody was listening,
723 * some are released when the device is re-opened.
724 * Wait 50 msec for the queue to empty before allowing events
730 clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
733 mutex_unlock(&usbhid->mutex);
737 static void usbhid_close(struct hid_device *hid)
739 struct usbhid_device *usbhid = hid->driver_data;
741 mutex_lock(&usbhid->mutex);
744 * Make sure we don't restart data acquisition due to
745 * a resumption we no longer care about by avoiding racing
746 * with hid_start_in().
748 spin_lock_irq(&usbhid->lock);
749 clear_bit(HID_OPENED, &usbhid->iofl);
750 if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL))
751 clear_bit(HID_IN_POLLING, &usbhid->iofl);
752 spin_unlock_irq(&usbhid->lock);
754 if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) {
755 hid_cancel_delayed_stuff(usbhid);
756 usb_kill_urb(usbhid->urbin);
757 usbhid->intf->needs_remote_wakeup = 0;
760 mutex_unlock(&usbhid->mutex);
764 * Initialize all reports
767 void usbhid_init_reports(struct hid_device *hid)
769 struct hid_report *report;
770 struct usbhid_device *usbhid = hid->driver_data;
771 struct hid_report_enum *report_enum;
774 report_enum = &hid->report_enum[HID_INPUT_REPORT];
775 list_for_each_entry(report, &report_enum->report_list, list)
776 usbhid_submit_report(hid, report, USB_DIR_IN);
778 report_enum = &hid->report_enum[HID_FEATURE_REPORT];
779 list_for_each_entry(report, &report_enum->report_list, list)
780 usbhid_submit_report(hid, report, USB_DIR_IN);
783 ret = usbhid_wait_io(hid);
786 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
787 usb_kill_urb(usbhid->urbctrl);
788 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
789 usb_kill_urb(usbhid->urbout);
790 ret = usbhid_wait_io(hid);
794 hid_warn(hid, "timeout initializing reports\n");
798 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
800 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
801 unsigned int hid_code, struct hid_field **pfield)
803 struct hid_report *report;
804 struct hid_field *field;
805 struct hid_usage *usage;
808 list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
809 for (i = 0; i < report->maxfield; i++) {
810 field = report->field[i];
811 for (j = 0; j < field->maxusage; j++) {
812 usage = &field->usage[j];
813 if ((usage->hid & HID_USAGE_PAGE) == page &&
814 (usage->hid & 0xFFFF) == hid_code) {
824 static void usbhid_set_leds(struct hid_device *hid)
826 struct hid_field *field;
829 if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
830 hid_set_field(field, offset, 0);
831 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
836 * Traverse the supplied list of reports and find the longest
838 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
841 struct hid_report *report;
844 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
845 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
851 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
853 struct usbhid_device *usbhid = hid->driver_data;
855 usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
857 usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
858 &usbhid->outbuf_dma);
859 usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
860 usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
861 &usbhid->ctrlbuf_dma);
862 if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
869 static int usbhid_get_raw_report(struct hid_device *hid,
870 unsigned char report_number, __u8 *buf, size_t count,
871 unsigned char report_type)
873 struct usbhid_device *usbhid = hid->driver_data;
874 struct usb_device *dev = hid_to_usb_dev(hid);
875 struct usb_interface *intf = usbhid->intf;
876 struct usb_host_interface *interface = intf->cur_altsetting;
877 int skipped_report_id = 0;
880 /* Byte 0 is the report number. Report data starts at byte 1.*/
881 buf[0] = report_number;
882 if (report_number == 0x0) {
883 /* Offset the return buffer by 1, so that the report ID
884 will remain in byte 0. */
887 skipped_report_id = 1;
889 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
891 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
892 ((report_type + 1) << 8) | report_number,
893 interface->desc.bInterfaceNumber, buf, count,
894 USB_CTRL_SET_TIMEOUT);
896 /* count also the report id */
897 if (ret > 0 && skipped_report_id)
903 static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum,
904 __u8 *buf, size_t count, unsigned char rtype)
906 struct usbhid_device *usbhid = hid->driver_data;
907 struct usb_device *dev = hid_to_usb_dev(hid);
908 struct usb_interface *intf = usbhid->intf;
909 struct usb_host_interface *interface = intf->cur_altsetting;
910 int ret, skipped_report_id = 0;
912 /* Byte 0 is the report number. Report data starts at byte 1.*/
913 if ((rtype == HID_OUTPUT_REPORT) &&
914 (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORT_ID))
920 /* Don't send the Report ID */
923 skipped_report_id = 1;
926 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
928 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
929 ((rtype + 1) << 8) | reportnum,
930 interface->desc.bInterfaceNumber, buf, count,
931 USB_CTRL_SET_TIMEOUT);
932 /* count also the report id, if this was a numbered report. */
933 if (ret > 0 && skipped_report_id)
939 static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count)
941 struct usbhid_device *usbhid = hid->driver_data;
942 struct usb_device *dev = hid_to_usb_dev(hid);
943 int actual_length, skipped_report_id = 0, ret;
949 /* Don't send the Report ID */
952 skipped_report_id = 1;
955 ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
956 buf, count, &actual_length,
957 USB_CTRL_SET_TIMEOUT);
958 /* return the number of bytes transferred */
961 /* count also the report id */
962 if (skipped_report_id)
969 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
971 struct usbhid_device *usbhid = hid->driver_data;
973 usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
974 usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
976 usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
979 static int usbhid_parse(struct hid_device *hid)
981 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
982 struct usb_host_interface *interface = intf->cur_altsetting;
983 struct usb_device *dev = interface_to_usbdev (intf);
984 struct hid_descriptor *hdesc;
986 unsigned int rsize = 0;
990 size_t offset = offsetof(struct hid_descriptor, desc);
992 quirks = hid_lookup_quirk(hid);
994 if (quirks & HID_QUIRK_IGNORE)
997 /* Many keyboards and mice don't like to be polled for reports,
998 * so we will always set the HID_QUIRK_NOGET flag for them. */
999 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
1000 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
1001 interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
1002 quirks |= HID_QUIRK_NOGET;
1005 if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
1006 (!interface->desc.bNumEndpoints ||
1007 usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
1008 dbg_hid("class descriptor not present\n");
1012 if (hdesc->bLength < sizeof(struct hid_descriptor)) {
1013 dbg_hid("hid descriptor is too short\n");
1017 hid->version = le16_to_cpu(hdesc->bcdHID);
1018 hid->country = hdesc->bCountryCode;
1020 num_descriptors = min_t(int, hdesc->bNumDescriptors,
1021 (hdesc->bLength - offset) / sizeof(struct hid_class_descriptor));
1023 for (n = 0; n < num_descriptors; n++)
1024 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
1025 rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
1027 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
1028 dbg_hid("weird size of report descriptor (%u)\n", rsize);
1032 rdesc = kmalloc(rsize, GFP_KERNEL);
1036 hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1038 ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1039 HID_DT_REPORT, rdesc, rsize);
1041 dbg_hid("reading report descriptor failed\n");
1046 ret = hid_parse_report(hid, rdesc, rsize);
1049 dbg_hid("parsing report descriptor failed\n");
1053 hid->quirks |= quirks;
1060 static int usbhid_start(struct hid_device *hid)
1062 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1063 struct usb_host_interface *interface = intf->cur_altsetting;
1064 struct usb_device *dev = interface_to_usbdev(intf);
1065 struct usbhid_device *usbhid = hid->driver_data;
1066 unsigned int n, insize = 0;
1069 mutex_lock(&usbhid->mutex);
1071 clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1073 usbhid->bufsize = HID_MIN_BUFFER_SIZE;
1074 hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
1075 hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
1076 hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
1078 if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1079 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1081 hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1083 if (insize > HID_MAX_BUFFER_SIZE)
1084 insize = HID_MAX_BUFFER_SIZE;
1086 if (hid_alloc_buffers(dev, hid)) {
1091 for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1092 struct usb_endpoint_descriptor *endpoint;
1096 endpoint = &interface->endpoint[n].desc;
1097 if (!usb_endpoint_xfer_int(endpoint))
1100 interval = endpoint->bInterval;
1102 /* Some vendors give fullspeed interval on highspeed devides */
1103 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
1104 dev->speed == USB_SPEED_HIGH) {
1105 interval = fls(endpoint->bInterval*8);
1106 pr_info("%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1107 hid->name, endpoint->bInterval, interval);
1110 /* Change the polling interval of mice, joysticks
1113 switch (hid->collection->usage) {
1115 if (hid_mousepoll_interval > 0)
1116 interval = hid_mousepoll_interval;
1118 case HID_GD_JOYSTICK:
1119 if (hid_jspoll_interval > 0)
1120 interval = hid_jspoll_interval;
1122 case HID_GD_KEYBOARD:
1123 if (hid_kbpoll_interval > 0)
1124 interval = hid_kbpoll_interval;
1129 if (usb_endpoint_dir_in(endpoint)) {
1132 if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1134 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1135 usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1136 hid_irq_in, hid, interval);
1137 usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1138 usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1142 if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1144 pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1145 usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1146 hid_irq_out, hid, interval);
1147 usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1148 usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1152 usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1153 if (!usbhid->urbctrl) {
1158 usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1159 usbhid->ctrlbuf, 1, hid_ctrl, hid);
1160 usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1161 usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1163 set_bit(HID_STARTED, &usbhid->iofl);
1165 if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1166 ret = usb_autopm_get_interface(usbhid->intf);
1169 set_bit(HID_IN_POLLING, &usbhid->iofl);
1170 usbhid->intf->needs_remote_wakeup = 1;
1171 ret = hid_start_in(hid);
1174 "failed to start in urb: %d\n", ret);
1176 usb_autopm_put_interface(usbhid->intf);
1179 /* Some keyboards don't work until their LEDs have been set.
1180 * Since BIOSes do set the LEDs, it must be safe for any device
1181 * that supports the keyboard boot protocol.
1182 * In addition, enable remote wakeup by default for all keyboard
1183 * devices supporting the boot protocol.
1185 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1186 interface->desc.bInterfaceProtocol ==
1187 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1188 usbhid_set_leds(hid);
1189 device_set_wakeup_enable(&dev->dev, 1);
1192 mutex_unlock(&usbhid->mutex);
1196 usb_free_urb(usbhid->urbin);
1197 usb_free_urb(usbhid->urbout);
1198 usb_free_urb(usbhid->urbctrl);
1199 usbhid->urbin = NULL;
1200 usbhid->urbout = NULL;
1201 usbhid->urbctrl = NULL;
1202 hid_free_buffers(dev, hid);
1203 mutex_unlock(&usbhid->mutex);
1207 static void usbhid_stop(struct hid_device *hid)
1209 struct usbhid_device *usbhid = hid->driver_data;
1211 if (WARN_ON(!usbhid))
1214 if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1215 clear_bit(HID_IN_POLLING, &usbhid->iofl);
1216 usbhid->intf->needs_remote_wakeup = 0;
1219 mutex_lock(&usbhid->mutex);
1221 clear_bit(HID_STARTED, &usbhid->iofl);
1223 spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
1224 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1225 while (usbhid->ctrltail != usbhid->ctrlhead) {
1226 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_OUT) {
1227 kfree(usbhid->ctrl[usbhid->ctrltail].raw_report);
1228 usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
1231 usbhid->ctrltail = (usbhid->ctrltail + 1) &
1232 (HID_CONTROL_FIFO_SIZE - 1);
1234 spin_unlock_irq(&usbhid->lock);
1236 usb_kill_urb(usbhid->urbin);
1237 usb_kill_urb(usbhid->urbout);
1238 usb_kill_urb(usbhid->urbctrl);
1240 hid_cancel_delayed_stuff(usbhid);
1244 usb_free_urb(usbhid->urbin);
1245 usb_free_urb(usbhid->urbctrl);
1246 usb_free_urb(usbhid->urbout);
1247 usbhid->urbin = NULL; /* don't mess up next start */
1248 usbhid->urbctrl = NULL;
1249 usbhid->urbout = NULL;
1251 hid_free_buffers(hid_to_usb_dev(hid), hid);
1253 mutex_unlock(&usbhid->mutex);
1256 static int usbhid_power(struct hid_device *hid, int lvl)
1258 struct usbhid_device *usbhid = hid->driver_data;
1262 case PM_HINT_FULLON:
1263 r = usb_autopm_get_interface(usbhid->intf);
1266 case PM_HINT_NORMAL:
1267 usb_autopm_put_interface(usbhid->intf);
1274 static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
1277 case HID_REQ_GET_REPORT:
1278 usbhid_submit_report(hid, rep, USB_DIR_IN);
1280 case HID_REQ_SET_REPORT:
1281 usbhid_submit_report(hid, rep, USB_DIR_OUT);
1286 static int usbhid_raw_request(struct hid_device *hid, unsigned char reportnum,
1287 __u8 *buf, size_t len, unsigned char rtype,
1291 case HID_REQ_GET_REPORT:
1292 return usbhid_get_raw_report(hid, reportnum, buf, len, rtype);
1293 case HID_REQ_SET_REPORT:
1294 return usbhid_set_raw_report(hid, reportnum, buf, len, rtype);
1300 static int usbhid_idle(struct hid_device *hid, int report, int idle,
1303 struct usb_device *dev = hid_to_usb_dev(hid);
1304 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1305 struct usb_host_interface *interface = intf->cur_altsetting;
1306 int ifnum = interface->desc.bInterfaceNumber;
1308 if (reqtype != HID_REQ_SET_IDLE)
1311 return hid_set_idle(dev, ifnum, report, idle);
1314 static bool usbhid_may_wakeup(struct hid_device *hid)
1316 struct usb_device *dev = hid_to_usb_dev(hid);
1318 return device_may_wakeup(&dev->dev);
1321 struct hid_ll_driver usb_hid_driver = {
1322 .parse = usbhid_parse,
1323 .start = usbhid_start,
1324 .stop = usbhid_stop,
1325 .open = usbhid_open,
1326 .close = usbhid_close,
1327 .power = usbhid_power,
1328 .request = usbhid_request,
1329 .wait = usbhid_wait_io,
1330 .raw_request = usbhid_raw_request,
1331 .output_report = usbhid_output_report,
1332 .idle = usbhid_idle,
1333 .may_wakeup = usbhid_may_wakeup,
1335 EXPORT_SYMBOL_GPL(usb_hid_driver);
1337 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1339 struct usb_host_interface *interface = intf->cur_altsetting;
1340 struct usb_device *dev = interface_to_usbdev(intf);
1341 struct usbhid_device *usbhid;
1342 struct hid_device *hid;
1343 unsigned int n, has_in = 0;
1347 dbg_hid("HID probe called for ifnum %d\n",
1348 intf->altsetting->desc.bInterfaceNumber);
1350 for (n = 0; n < interface->desc.bNumEndpoints; n++)
1351 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1354 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1358 hid = hid_allocate_device();
1360 return PTR_ERR(hid);
1362 usb_set_intfdata(intf, hid);
1363 hid->ll_driver = &usb_hid_driver;
1364 hid->ff_init = hid_pidff_init;
1365 #ifdef CONFIG_USB_HIDDEV
1366 hid->hiddev_connect = hiddev_connect;
1367 hid->hiddev_disconnect = hiddev_disconnect;
1368 hid->hiddev_hid_event = hiddev_hid_event;
1369 hid->hiddev_report_event = hiddev_report_event;
1371 hid->dev.parent = &intf->dev;
1373 hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1374 hid->product = le16_to_cpu(dev->descriptor.idProduct);
1375 hid->version = le16_to_cpu(dev->descriptor.bcdDevice);
1377 if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1378 USB_INTERFACE_PROTOCOL_MOUSE)
1379 hid->type = HID_TYPE_USBMOUSE;
1380 else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1381 hid->type = HID_TYPE_USBNONE;
1383 if (dev->manufacturer)
1384 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1387 if (dev->manufacturer)
1388 strlcat(hid->name, " ", sizeof(hid->name));
1389 strlcat(hid->name, dev->product, sizeof(hid->name));
1392 if (!strlen(hid->name))
1393 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1394 le16_to_cpu(dev->descriptor.idVendor),
1395 le16_to_cpu(dev->descriptor.idProduct));
1397 usb_make_path(dev, hid->phys, sizeof(hid->phys));
1398 strlcat(hid->phys, "/input", sizeof(hid->phys));
1399 len = strlen(hid->phys);
1400 if (len < sizeof(hid->phys) - 1)
1401 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1402 "%d", intf->altsetting[0].desc.bInterfaceNumber);
1404 if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1407 usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1408 if (usbhid == NULL) {
1413 hid->driver_data = usbhid;
1415 usbhid->intf = intf;
1416 usbhid->ifnum = interface->desc.bInterfaceNumber;
1418 init_waitqueue_head(&usbhid->wait);
1419 INIT_WORK(&usbhid->reset_work, hid_reset);
1420 timer_setup(&usbhid->io_retry, hid_retry_timeout, 0);
1421 spin_lock_init(&usbhid->lock);
1422 mutex_init(&usbhid->mutex);
1424 ret = hid_add_device(hid);
1427 hid_err(intf, "can't add hid device: %d\n", ret);
1435 hid_destroy_device(hid);
1439 static void usbhid_disconnect(struct usb_interface *intf)
1441 struct hid_device *hid = usb_get_intfdata(intf);
1442 struct usbhid_device *usbhid;
1447 usbhid = hid->driver_data;
1448 spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
1449 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1450 spin_unlock_irq(&usbhid->lock);
1451 hid_destroy_device(hid);
1455 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1457 del_timer_sync(&usbhid->io_retry);
1458 cancel_work_sync(&usbhid->reset_work);
1461 static void hid_cease_io(struct usbhid_device *usbhid)
1463 del_timer_sync(&usbhid->io_retry);
1464 usb_kill_urb(usbhid->urbin);
1465 usb_kill_urb(usbhid->urbctrl);
1466 usb_kill_urb(usbhid->urbout);
1469 static void hid_restart_io(struct hid_device *hid)
1471 struct usbhid_device *usbhid = hid->driver_data;
1472 int clear_halt = test_bit(HID_CLEAR_HALT, &usbhid->iofl);
1473 int reset_pending = test_bit(HID_RESET_PENDING, &usbhid->iofl);
1475 spin_lock_irq(&usbhid->lock);
1476 clear_bit(HID_SUSPENDED, &usbhid->iofl);
1477 usbhid_mark_busy(usbhid);
1479 if (clear_halt || reset_pending)
1480 schedule_work(&usbhid->reset_work);
1481 usbhid->retry_delay = 0;
1482 spin_unlock_irq(&usbhid->lock);
1484 if (reset_pending || !test_bit(HID_STARTED, &usbhid->iofl))
1488 if (hid_start_in(hid) < 0)
1492 spin_lock_irq(&usbhid->lock);
1493 if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl))
1494 usbhid_restart_out_queue(usbhid);
1495 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
1496 usbhid_restart_ctrl_queue(usbhid);
1497 spin_unlock_irq(&usbhid->lock);
1500 /* Treat USB reset pretty much the same as suspend/resume */
1501 static int hid_pre_reset(struct usb_interface *intf)
1503 struct hid_device *hid = usb_get_intfdata(intf);
1504 struct usbhid_device *usbhid = hid->driver_data;
1506 spin_lock_irq(&usbhid->lock);
1507 set_bit(HID_RESET_PENDING, &usbhid->iofl);
1508 spin_unlock_irq(&usbhid->lock);
1509 hid_cease_io(usbhid);
1514 /* Same routine used for post_reset and reset_resume */
1515 static int hid_post_reset(struct usb_interface *intf)
1517 struct usb_device *dev = interface_to_usbdev (intf);
1518 struct hid_device *hid = usb_get_intfdata(intf);
1519 struct usbhid_device *usbhid = hid->driver_data;
1520 struct usb_host_interface *interface = intf->cur_altsetting;
1524 /* Fetch and examine the HID report descriptor. If this
1525 * has changed, then rebind. Since usbcore's check of the
1526 * configuration descriptors passed, we already know that
1527 * the size of the HID report descriptor has not changed.
1529 rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL);
1533 status = hid_get_class_descriptor(dev,
1534 interface->desc.bInterfaceNumber,
1535 HID_DT_REPORT, rdesc, hid->dev_rsize);
1537 dbg_hid("reading report descriptor failed (post_reset)\n");
1541 status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize);
1544 dbg_hid("report descriptor changed\n");
1548 /* No need to do another reset or clear a halted endpoint */
1549 spin_lock_irq(&usbhid->lock);
1550 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1551 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
1552 spin_unlock_irq(&usbhid->lock);
1553 hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1555 hid_restart_io(hid);
1561 static int hid_resume_common(struct hid_device *hid, bool driver_suspended)
1565 hid_restart_io(hid);
1566 if (driver_suspended)
1567 status = hid_driver_resume(hid);
1571 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1573 struct hid_device *hid = usb_get_intfdata(intf);
1574 struct usbhid_device *usbhid = hid->driver_data;
1576 bool driver_suspended = false;
1577 unsigned int ledcount;
1579 if (PMSG_IS_AUTO(message)) {
1580 ledcount = hidinput_count_leds(hid);
1581 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1582 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1583 && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1584 && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1585 && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1586 && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1587 && (!ledcount || ignoreled))
1589 set_bit(HID_SUSPENDED, &usbhid->iofl);
1590 spin_unlock_irq(&usbhid->lock);
1591 status = hid_driver_suspend(hid, message);
1594 driver_suspended = true;
1596 usbhid_mark_busy(usbhid);
1597 spin_unlock_irq(&usbhid->lock);
1602 /* TODO: resume() might need to handle suspend failure */
1603 status = hid_driver_suspend(hid, message);
1604 driver_suspended = true;
1605 spin_lock_irq(&usbhid->lock);
1606 set_bit(HID_SUSPENDED, &usbhid->iofl);
1607 spin_unlock_irq(&usbhid->lock);
1608 if (usbhid_wait_io(hid) < 0)
1612 hid_cancel_delayed_stuff(usbhid);
1613 hid_cease_io(usbhid);
1615 if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1616 /* lost race against keypresses */
1620 dev_dbg(&intf->dev, "suspend\n");
1624 hid_resume_common(hid, driver_suspended);
1628 static int hid_resume(struct usb_interface *intf)
1630 struct hid_device *hid = usb_get_intfdata (intf);
1633 status = hid_resume_common(hid, true);
1634 dev_dbg(&intf->dev, "resume status %d\n", status);
1638 static int hid_reset_resume(struct usb_interface *intf)
1640 struct hid_device *hid = usb_get_intfdata(intf);
1643 status = hid_post_reset(intf);
1645 int ret = hid_driver_reset_resume(hid);
1652 #endif /* CONFIG_PM */
1654 static const struct usb_device_id hid_usb_ids[] = {
1655 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1656 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1657 { } /* Terminating entry */
1660 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1662 static struct usb_driver hid_driver = {
1664 .probe = usbhid_probe,
1665 .disconnect = usbhid_disconnect,
1667 .suspend = hid_suspend,
1668 .resume = hid_resume,
1669 .reset_resume = hid_reset_resume,
1671 .pre_reset = hid_pre_reset,
1672 .post_reset = hid_post_reset,
1673 .id_table = hid_usb_ids,
1674 .supports_autosuspend = 1,
1677 struct usb_interface *usbhid_find_interface(int minor)
1679 return usb_find_interface(&hid_driver, minor);
1682 static int __init hid_init(void)
1686 retval = hid_quirks_init(quirks_param, BUS_USB, MAX_USBHID_BOOT_QUIRKS);
1688 goto usbhid_quirks_init_fail;
1689 retval = usb_register(&hid_driver);
1691 goto usb_register_fail;
1692 pr_info(KBUILD_MODNAME ": " DRIVER_DESC "\n");
1696 hid_quirks_exit(BUS_USB);
1697 usbhid_quirks_init_fail:
1701 static void __exit hid_exit(void)
1703 usb_deregister(&hid_driver);
1704 hid_quirks_exit(BUS_USB);
1707 module_init(hid_init);
1708 module_exit(hid_exit);
1710 MODULE_AUTHOR("Andreas Gal");
1711 MODULE_AUTHOR("Vojtech Pavlik");
1712 MODULE_AUTHOR("Jiri Kosina");
1713 MODULE_DESCRIPTION(DRIVER_DESC);
1714 MODULE_LICENSE("GPL");