2 * USB HID support for Linux
4 * Copyright (c) 1999 Andreas Gal
5 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
6 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
7 * Copyright (c) 2007-2008 Oliver Neukum
8 * Copyright (c) 2006-2010 Jiri Kosina
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/spinlock.h>
26 #include <asm/unaligned.h>
27 #include <asm/byteorder.h>
28 #include <linux/input.h>
29 #include <linux/wait.h>
30 #include <linux/workqueue.h>
31 #include <linux/string.h>
33 #include <linux/usb.h>
35 #include <linux/hid.h>
36 #include <linux/hiddev.h>
37 #include <linux/hid-debug.h>
38 #include <linux/hidraw.h>
45 #define DRIVER_DESC "USB HID core driver"
51 static unsigned int hid_mousepoll_interval;
52 module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
53 MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
55 static unsigned int hid_jspoll_interval;
56 module_param_named(jspoll, hid_jspoll_interval, uint, 0644);
57 MODULE_PARM_DESC(jspoll, "Polling interval of joysticks");
59 static unsigned int hid_kbpoll_interval;
60 module_param_named(kbpoll, hid_kbpoll_interval, uint, 0644);
61 MODULE_PARM_DESC(kbpoll, "Polling interval of keyboards");
63 static unsigned int ignoreled;
64 module_param_named(ignoreled, ignoreled, uint, 0644);
65 MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
67 /* Quirks specified at module load time */
68 static char *quirks_param[MAX_USBHID_BOOT_QUIRKS];
69 module_param_array_named(quirks, quirks_param, charp, NULL, 0444);
70 MODULE_PARM_DESC(quirks, "Add/modify USB HID quirks by specifying "
71 " quirks=vendorID:productID:quirks"
72 " where vendorID, productID, and quirks are all in"
75 * Input submission and I/O error handler.
77 static void hid_io_error(struct hid_device *hid);
78 static int hid_submit_out(struct hid_device *hid);
79 static int hid_submit_ctrl(struct hid_device *hid);
80 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid);
82 /* Start up the input URB */
83 static int hid_start_in(struct hid_device *hid)
87 struct usbhid_device *usbhid = hid->driver_data;
89 spin_lock_irqsave(&usbhid->lock, flags);
90 if (test_bit(HID_IN_POLLING, &usbhid->iofl) &&
91 !test_bit(HID_DISCONNECTED, &usbhid->iofl) &&
92 !test_bit(HID_SUSPENDED, &usbhid->iofl) &&
93 !test_and_set_bit(HID_IN_RUNNING, &usbhid->iofl)) {
94 rc = usb_submit_urb(usbhid->urbin, GFP_ATOMIC);
96 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
98 set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
100 clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
103 spin_unlock_irqrestore(&usbhid->lock, flags);
107 /* I/O retry timer routine */
108 static void hid_retry_timeout(struct timer_list *t)
110 struct usbhid_device *usbhid = from_timer(usbhid, t, io_retry);
111 struct hid_device *hid = usbhid->hid;
113 dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
114 if (hid_start_in(hid))
118 /* Workqueue routine to reset the device or clear a halt */
119 static void hid_reset(struct work_struct *work)
121 struct usbhid_device *usbhid =
122 container_of(work, struct usbhid_device, reset_work);
123 struct hid_device *hid = usbhid->hid;
126 if (test_bit(HID_CLEAR_HALT, &usbhid->iofl)) {
127 dev_dbg(&usbhid->intf->dev, "clear halt\n");
128 rc = usb_clear_halt(hid_to_usb_dev(hid), usbhid->urbin->pipe);
129 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
133 dev_dbg(&usbhid->intf->dev,
134 "clear-halt failed: %d\n", rc);
135 set_bit(HID_RESET_PENDING, &usbhid->iofl);
139 if (test_bit(HID_RESET_PENDING, &usbhid->iofl)) {
140 dev_dbg(&usbhid->intf->dev, "resetting device\n");
141 usb_queue_reset_device(usbhid->intf);
145 /* Main I/O error handler */
146 static void hid_io_error(struct hid_device *hid)
149 struct usbhid_device *usbhid = hid->driver_data;
151 spin_lock_irqsave(&usbhid->lock, flags);
153 /* Stop when disconnected */
154 if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
157 /* If it has been a while since the last error, we'll assume
158 * this a brand new error and reset the retry timeout. */
159 if (time_after(jiffies, usbhid->stop_retry + HZ/2))
160 usbhid->retry_delay = 0;
162 /* When an error occurs, retry at increasing intervals */
163 if (usbhid->retry_delay == 0) {
164 usbhid->retry_delay = 13; /* Then 26, 52, 104, 104, ... */
165 usbhid->stop_retry = jiffies + msecs_to_jiffies(1000);
166 } else if (usbhid->retry_delay < 100)
167 usbhid->retry_delay *= 2;
169 if (time_after(jiffies, usbhid->stop_retry)) {
171 /* Retries failed, so do a port reset unless we lack bandwidth*/
172 if (!test_bit(HID_NO_BANDWIDTH, &usbhid->iofl)
173 && !test_and_set_bit(HID_RESET_PENDING, &usbhid->iofl)) {
175 schedule_work(&usbhid->reset_work);
180 mod_timer(&usbhid->io_retry,
181 jiffies + msecs_to_jiffies(usbhid->retry_delay));
183 spin_unlock_irqrestore(&usbhid->lock, flags);
186 static void usbhid_mark_busy(struct usbhid_device *usbhid)
188 struct usb_interface *intf = usbhid->intf;
190 usb_mark_last_busy(interface_to_usbdev(intf));
193 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
195 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
199 if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
200 test_bit(HID_SUSPENDED, &usbhid->iofl))
203 if ((kicked = (usbhid->outhead != usbhid->outtail))) {
204 hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
206 /* Try to wake up from autosuspend... */
207 r = usb_autopm_get_interface_async(usbhid->intf);
212 * If still suspended, don't submit. Submission will
213 * occur if/when resume drains the queue.
215 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
216 usb_autopm_put_interface_no_suspend(usbhid->intf);
220 /* Asynchronously flush queue. */
221 set_bit(HID_OUT_RUNNING, &usbhid->iofl);
222 if (hid_submit_out(hid)) {
223 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
224 usb_autopm_put_interface_async(usbhid->intf);
226 wake_up(&usbhid->wait);
231 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
233 struct hid_device *hid = usb_get_intfdata(usbhid->intf);
237 WARN_ON(hid == NULL);
238 if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
239 test_bit(HID_SUSPENDED, &usbhid->iofl))
242 if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
243 hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
245 /* Try to wake up from autosuspend... */
246 r = usb_autopm_get_interface_async(usbhid->intf);
251 * If still suspended, don't submit. Submission will
252 * occur if/when resume drains the queue.
254 if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
255 usb_autopm_put_interface_no_suspend(usbhid->intf);
259 /* Asynchronously flush queue. */
260 set_bit(HID_CTRL_RUNNING, &usbhid->iofl);
261 if (hid_submit_ctrl(hid)) {
262 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
263 usb_autopm_put_interface_async(usbhid->intf);
265 wake_up(&usbhid->wait);
271 * Input interrupt completion handler.
274 static void hid_irq_in(struct urb *urb)
276 struct hid_device *hid = urb->context;
277 struct usbhid_device *usbhid = hid->driver_data;
280 switch (urb->status) {
281 case 0: /* success */
282 usbhid->retry_delay = 0;
283 if (!test_bit(HID_OPENED, &usbhid->iofl))
285 usbhid_mark_busy(usbhid);
286 if (!test_bit(HID_RESUME_RUNNING, &usbhid->iofl)) {
287 hid_input_report(urb->context, HID_INPUT_REPORT,
288 urb->transfer_buffer,
289 urb->actual_length, 1);
291 * autosuspend refused while keys are pressed
292 * because most keyboards don't wake up when
295 if (hid_check_keys_pressed(hid))
296 set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
298 clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
301 case -EPIPE: /* stall */
302 usbhid_mark_busy(usbhid);
303 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
304 set_bit(HID_CLEAR_HALT, &usbhid->iofl);
305 schedule_work(&usbhid->reset_work);
307 case -ECONNRESET: /* unlink */
309 case -ESHUTDOWN: /* unplug */
310 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
312 case -EILSEQ: /* protocol error or unplug */
313 case -EPROTO: /* protocol error or unplug */
314 case -ETIME: /* protocol error or unplug */
315 case -ETIMEDOUT: /* Should never happen, but... */
316 usbhid_mark_busy(usbhid);
317 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
321 hid_warn(urb->dev, "input irq status %d received\n",
325 status = usb_submit_urb(urb, GFP_ATOMIC);
327 clear_bit(HID_IN_RUNNING, &usbhid->iofl);
328 if (status != -EPERM) {
329 hid_err(hid, "can't resubmit intr, %s-%s/input%d, status %d\n",
330 hid_to_usb_dev(hid)->bus->bus_name,
331 hid_to_usb_dev(hid)->devpath,
332 usbhid->ifnum, status);
338 static int hid_submit_out(struct hid_device *hid)
340 struct hid_report *report;
342 struct usbhid_device *usbhid = hid->driver_data;
345 report = usbhid->out[usbhid->outtail].report;
346 raw_report = usbhid->out[usbhid->outtail].raw_report;
348 usbhid->urbout->transfer_buffer_length = hid_report_len(report);
349 usbhid->urbout->dev = hid_to_usb_dev(hid);
351 memcpy(usbhid->outbuf, raw_report,
352 usbhid->urbout->transfer_buffer_length);
354 usbhid->out[usbhid->outtail].raw_report = NULL;
357 dbg_hid("submitting out urb\n");
359 r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
361 hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
364 usbhid->last_out = jiffies;
368 static int hid_submit_ctrl(struct hid_device *hid)
370 struct hid_report *report;
374 struct usbhid_device *usbhid = hid->driver_data;
376 report = usbhid->ctrl[usbhid->ctrltail].report;
377 raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
378 dir = usbhid->ctrl[usbhid->ctrltail].dir;
380 len = hid_report_len(report);
381 if (dir == USB_DIR_OUT) {
382 usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
383 usbhid->urbctrl->transfer_buffer_length = len;
385 memcpy(usbhid->ctrlbuf, raw_report, len);
387 usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
390 int maxpacket, padlen;
392 usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
393 maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
394 usbhid->urbctrl->pipe, 0);
396 padlen = DIV_ROUND_UP(len, maxpacket);
398 if (padlen > usbhid->bufsize)
399 padlen = usbhid->bufsize;
402 usbhid->urbctrl->transfer_buffer_length = padlen;
404 usbhid->urbctrl->dev = hid_to_usb_dev(hid);
406 usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
407 usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
409 usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
411 usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
412 usbhid->cr->wLength = cpu_to_le16(len);
414 dbg_hid("submitting ctrl urb: %s wValue=0x%04x wIndex=0x%04x wLength=%u\n",
415 usbhid->cr->bRequest == HID_REQ_SET_REPORT ? "Set_Report" :
417 usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
419 r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
421 hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
424 usbhid->last_ctrl = jiffies;
429 * Output interrupt completion handler.
432 static void hid_irq_out(struct urb *urb)
434 struct hid_device *hid = urb->context;
435 struct usbhid_device *usbhid = hid->driver_data;
439 switch (urb->status) {
440 case 0: /* success */
442 case -ESHUTDOWN: /* unplug */
444 case -EILSEQ: /* protocol error or unplug */
445 case -EPROTO: /* protocol error or unplug */
446 case -ECONNRESET: /* unlink */
450 hid_warn(urb->dev, "output irq status %d received\n",
454 spin_lock_irqsave(&usbhid->lock, flags);
457 usbhid->outtail = usbhid->outhead;
459 usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
461 if (usbhid->outhead != usbhid->outtail &&
462 hid_submit_out(hid) == 0) {
463 /* Successfully submitted next urb in queue */
464 spin_unlock_irqrestore(&usbhid->lock, flags);
469 clear_bit(HID_OUT_RUNNING, &usbhid->iofl);
470 spin_unlock_irqrestore(&usbhid->lock, flags);
471 usb_autopm_put_interface_async(usbhid->intf);
472 wake_up(&usbhid->wait);
476 * Control pipe completion handler.
479 static void hid_ctrl(struct urb *urb)
481 struct hid_device *hid = urb->context;
482 struct usbhid_device *usbhid = hid->driver_data;
484 int unplug = 0, status = urb->status;
487 case 0: /* success */
488 if (usbhid->ctrl[usbhid->ctrltail].dir == USB_DIR_IN)
489 hid_input_report(urb->context,
490 usbhid->ctrl[usbhid->ctrltail].report->type,
491 urb->transfer_buffer, urb->actual_length, 0);
493 case -ESHUTDOWN: /* unplug */
495 case -EILSEQ: /* protocol error or unplug */
496 case -EPROTO: /* protocol error or unplug */
497 case -ECONNRESET: /* unlink */
499 case -EPIPE: /* report not available */
502 hid_warn(urb->dev, "ctrl urb status %d received\n", status);
505 spin_lock_irqsave(&usbhid->lock, flags);
508 usbhid->ctrltail = usbhid->ctrlhead;
510 usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
512 if (usbhid->ctrlhead != usbhid->ctrltail &&
513 hid_submit_ctrl(hid) == 0) {
514 /* Successfully submitted next urb in queue */
515 spin_unlock_irqrestore(&usbhid->lock, flags);
520 clear_bit(HID_CTRL_RUNNING, &usbhid->iofl);
521 spin_unlock_irqrestore(&usbhid->lock, flags);
522 usb_autopm_put_interface_async(usbhid->intf);
523 wake_up(&usbhid->wait);
526 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
530 struct usbhid_device *usbhid = hid->driver_data;
532 if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
533 test_bit(HID_DISCONNECTED, &usbhid->iofl))
536 if (usbhid->urbout && dir == USB_DIR_OUT && report->type == HID_OUTPUT_REPORT) {
537 if ((head = (usbhid->outhead + 1) & (HID_OUTPUT_FIFO_SIZE - 1)) == usbhid->outtail) {
538 hid_warn(hid, "output queue full\n");
542 usbhid->out[usbhid->outhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
543 if (!usbhid->out[usbhid->outhead].raw_report) {
544 hid_warn(hid, "output queueing failed\n");
547 hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
548 usbhid->out[usbhid->outhead].report = report;
549 usbhid->outhead = head;
551 /* If the queue isn't running, restart it */
552 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
553 usbhid_restart_out_queue(usbhid);
555 /* Otherwise see if an earlier request has timed out */
556 } else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
558 /* Prevent autosuspend following the unlink */
559 usb_autopm_get_interface_no_resume(usbhid->intf);
562 * Prevent resubmission in case the URB completes
563 * before we can unlink it. We don't want to cancel
564 * the wrong transfer!
566 usb_block_urb(usbhid->urbout);
568 /* Drop lock to avoid deadlock if the callback runs */
569 spin_unlock(&usbhid->lock);
571 usb_unlink_urb(usbhid->urbout);
572 spin_lock(&usbhid->lock);
573 usb_unblock_urb(usbhid->urbout);
575 /* Unlink might have stopped the queue */
576 if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
577 usbhid_restart_out_queue(usbhid);
579 /* Now we can allow autosuspend again */
580 usb_autopm_put_interface_async(usbhid->intf);
585 if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
586 hid_warn(hid, "control queue full\n");
590 if (dir == USB_DIR_OUT) {
591 usbhid->ctrl[usbhid->ctrlhead].raw_report = hid_alloc_report_buf(report, GFP_ATOMIC);
592 if (!usbhid->ctrl[usbhid->ctrlhead].raw_report) {
593 hid_warn(hid, "control queueing failed\n");
596 hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
598 usbhid->ctrl[usbhid->ctrlhead].report = report;
599 usbhid->ctrl[usbhid->ctrlhead].dir = dir;
600 usbhid->ctrlhead = head;
602 /* If the queue isn't running, restart it */
603 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
604 usbhid_restart_ctrl_queue(usbhid);
606 /* Otherwise see if an earlier request has timed out */
607 } else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
609 /* Prevent autosuspend following the unlink */
610 usb_autopm_get_interface_no_resume(usbhid->intf);
613 * Prevent resubmission in case the URB completes
614 * before we can unlink it. We don't want to cancel
615 * the wrong transfer!
617 usb_block_urb(usbhid->urbctrl);
619 /* Drop lock to avoid deadlock if the callback runs */
620 spin_unlock(&usbhid->lock);
622 usb_unlink_urb(usbhid->urbctrl);
623 spin_lock(&usbhid->lock);
624 usb_unblock_urb(usbhid->urbctrl);
626 /* Unlink might have stopped the queue */
627 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
628 usbhid_restart_ctrl_queue(usbhid);
630 /* Now we can allow autosuspend again */
631 usb_autopm_put_interface_async(usbhid->intf);
635 static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
637 struct usbhid_device *usbhid = hid->driver_data;
640 spin_lock_irqsave(&usbhid->lock, flags);
641 __usbhid_submit_report(hid, report, dir);
642 spin_unlock_irqrestore(&usbhid->lock, flags);
645 static int usbhid_wait_io(struct hid_device *hid)
647 struct usbhid_device *usbhid = hid->driver_data;
649 if (!wait_event_timeout(usbhid->wait,
650 (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
651 !test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
653 dbg_hid("timeout waiting for ctrl or out queue to clear\n");
660 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
662 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
663 HID_REQ_SET_IDLE, USB_TYPE_CLASS | USB_RECIP_INTERFACE, (idle << 8) | report,
664 ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
667 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
668 unsigned char type, void *buf, int size)
670 int result, retries = 4;
672 memset(buf, 0, size);
675 result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
676 USB_REQ_GET_DESCRIPTOR, USB_RECIP_INTERFACE | USB_DIR_IN,
677 (type << 8), ifnum, buf, size, USB_CTRL_GET_TIMEOUT);
679 } while (result < size && retries);
683 static int usbhid_open(struct hid_device *hid)
685 struct usbhid_device *usbhid = hid->driver_data;
688 mutex_lock(&usbhid->mutex);
690 set_bit(HID_OPENED, &usbhid->iofl);
692 if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
697 res = usb_autopm_get_interface(usbhid->intf);
698 /* the device must be awake to reliably request remote wakeup */
700 clear_bit(HID_OPENED, &usbhid->iofl);
705 usbhid->intf->needs_remote_wakeup = 1;
707 set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
708 set_bit(HID_IN_POLLING, &usbhid->iofl);
710 res = hid_start_in(hid);
712 if (res != -ENOSPC) {
716 /* no use opening if resources are insufficient */
718 clear_bit(HID_OPENED, &usbhid->iofl);
719 clear_bit(HID_IN_POLLING, &usbhid->iofl);
720 usbhid->intf->needs_remote_wakeup = 0;
724 usb_autopm_put_interface(usbhid->intf);
727 * In case events are generated while nobody was listening,
728 * some are released when the device is re-opened.
729 * Wait 50 msec for the queue to empty before allowing events
735 clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
738 mutex_unlock(&usbhid->mutex);
742 static void usbhid_close(struct hid_device *hid)
744 struct usbhid_device *usbhid = hid->driver_data;
746 mutex_lock(&usbhid->mutex);
749 * Make sure we don't restart data acquisition due to
750 * a resumption we no longer care about by avoiding racing
751 * with hid_start_in().
753 spin_lock_irq(&usbhid->lock);
754 clear_bit(HID_OPENED, &usbhid->iofl);
755 if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL))
756 clear_bit(HID_IN_POLLING, &usbhid->iofl);
757 spin_unlock_irq(&usbhid->lock);
759 if (!(hid->quirks & HID_QUIRK_ALWAYS_POLL)) {
760 hid_cancel_delayed_stuff(usbhid);
761 usb_kill_urb(usbhid->urbin);
762 usbhid->intf->needs_remote_wakeup = 0;
765 mutex_unlock(&usbhid->mutex);
769 * Initialize all reports
772 void usbhid_init_reports(struct hid_device *hid)
774 struct hid_report *report;
775 struct usbhid_device *usbhid = hid->driver_data;
776 struct hid_report_enum *report_enum;
779 report_enum = &hid->report_enum[HID_INPUT_REPORT];
780 list_for_each_entry(report, &report_enum->report_list, list)
781 usbhid_submit_report(hid, report, USB_DIR_IN);
783 report_enum = &hid->report_enum[HID_FEATURE_REPORT];
784 list_for_each_entry(report, &report_enum->report_list, list)
785 usbhid_submit_report(hid, report, USB_DIR_IN);
788 ret = usbhid_wait_io(hid);
791 if (test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
792 usb_kill_urb(usbhid->urbctrl);
793 if (test_bit(HID_OUT_RUNNING, &usbhid->iofl))
794 usb_kill_urb(usbhid->urbout);
795 ret = usbhid_wait_io(hid);
799 hid_warn(hid, "timeout initializing reports\n");
803 * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
805 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
806 unsigned int hid_code, struct hid_field **pfield)
808 struct hid_report *report;
809 struct hid_field *field;
810 struct hid_usage *usage;
813 list_for_each_entry(report, &hid->report_enum[HID_OUTPUT_REPORT].report_list, list) {
814 for (i = 0; i < report->maxfield; i++) {
815 field = report->field[i];
816 for (j = 0; j < field->maxusage; j++) {
817 usage = &field->usage[j];
818 if ((usage->hid & HID_USAGE_PAGE) == page &&
819 (usage->hid & 0xFFFF) == hid_code) {
829 static void usbhid_set_leds(struct hid_device *hid)
831 struct hid_field *field;
834 if ((offset = hid_find_field_early(hid, HID_UP_LED, 0x01, &field)) != -1) {
835 hid_set_field(field, offset, 0);
836 usbhid_submit_report(hid, field->report, USB_DIR_OUT);
841 * Traverse the supplied list of reports and find the longest
843 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
846 struct hid_report *report;
849 list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
850 size = ((report->size - 1) >> 3) + 1 + hid->report_enum[type].numbered;
856 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
858 struct usbhid_device *usbhid = hid->driver_data;
860 usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
862 usbhid->outbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
863 &usbhid->outbuf_dma);
864 usbhid->cr = kmalloc(sizeof(*usbhid->cr), GFP_KERNEL);
865 usbhid->ctrlbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
866 &usbhid->ctrlbuf_dma);
867 if (!usbhid->inbuf || !usbhid->outbuf || !usbhid->cr ||
874 static int usbhid_get_raw_report(struct hid_device *hid,
875 unsigned char report_number, __u8 *buf, size_t count,
876 unsigned char report_type)
878 struct usbhid_device *usbhid = hid->driver_data;
879 struct usb_device *dev = hid_to_usb_dev(hid);
880 struct usb_interface *intf = usbhid->intf;
881 struct usb_host_interface *interface = intf->cur_altsetting;
882 int skipped_report_id = 0;
885 /* Byte 0 is the report number. Report data starts at byte 1.*/
886 buf[0] = report_number;
887 if (report_number == 0x0) {
888 /* Offset the return buffer by 1, so that the report ID
889 will remain in byte 0. */
892 skipped_report_id = 1;
894 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
896 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
897 ((report_type + 1) << 8) | report_number,
898 interface->desc.bInterfaceNumber, buf, count,
899 USB_CTRL_SET_TIMEOUT);
901 /* count also the report id */
902 if (ret > 0 && skipped_report_id)
908 static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum,
909 __u8 *buf, size_t count, unsigned char rtype)
911 struct usbhid_device *usbhid = hid->driver_data;
912 struct usb_device *dev = hid_to_usb_dev(hid);
913 struct usb_interface *intf = usbhid->intf;
914 struct usb_host_interface *interface = intf->cur_altsetting;
915 int ret, skipped_report_id = 0;
917 /* Byte 0 is the report number. Report data starts at byte 1.*/
918 if ((rtype == HID_OUTPUT_REPORT) &&
919 (hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORT_ID))
925 /* Don't send the Report ID */
928 skipped_report_id = 1;
931 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
933 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
934 ((rtype + 1) << 8) | reportnum,
935 interface->desc.bInterfaceNumber, buf, count,
936 USB_CTRL_SET_TIMEOUT);
937 /* count also the report id, if this was a numbered report. */
938 if (ret > 0 && skipped_report_id)
944 static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count)
946 struct usbhid_device *usbhid = hid->driver_data;
947 struct usb_device *dev = hid_to_usb_dev(hid);
948 int actual_length, skipped_report_id = 0, ret;
954 /* Don't send the Report ID */
957 skipped_report_id = 1;
960 ret = usb_interrupt_msg(dev, usbhid->urbout->pipe,
961 buf, count, &actual_length,
962 USB_CTRL_SET_TIMEOUT);
963 /* return the number of bytes transferred */
966 /* count also the report id */
967 if (skipped_report_id)
974 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
976 struct usbhid_device *usbhid = hid->driver_data;
978 usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
979 usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
981 usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
984 static int usbhid_parse(struct hid_device *hid)
986 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
987 struct usb_host_interface *interface = intf->cur_altsetting;
988 struct usb_device *dev = interface_to_usbdev (intf);
989 struct hid_descriptor *hdesc;
991 unsigned int rsize = 0;
995 size_t offset = offsetof(struct hid_descriptor, desc);
997 quirks = hid_lookup_quirk(hid);
999 if (quirks & HID_QUIRK_IGNORE)
1002 /* Many keyboards and mice don't like to be polled for reports,
1003 * so we will always set the HID_QUIRK_NOGET flag for them. */
1004 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
1005 if (interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_KEYBOARD ||
1006 interface->desc.bInterfaceProtocol == USB_INTERFACE_PROTOCOL_MOUSE)
1007 quirks |= HID_QUIRK_NOGET;
1010 if (usb_get_extra_descriptor(interface, HID_DT_HID, &hdesc) &&
1011 (!interface->desc.bNumEndpoints ||
1012 usb_get_extra_descriptor(&interface->endpoint[0], HID_DT_HID, &hdesc))) {
1013 dbg_hid("class descriptor not present\n");
1017 if (hdesc->bLength < sizeof(struct hid_descriptor)) {
1018 dbg_hid("hid descriptor is too short\n");
1022 hid->version = le16_to_cpu(hdesc->bcdHID);
1023 hid->country = hdesc->bCountryCode;
1025 num_descriptors = min_t(int, hdesc->bNumDescriptors,
1026 (hdesc->bLength - offset) / sizeof(struct hid_class_descriptor));
1028 for (n = 0; n < num_descriptors; n++)
1029 if (hdesc->desc[n].bDescriptorType == HID_DT_REPORT)
1030 rsize = le16_to_cpu(hdesc->desc[n].wDescriptorLength);
1032 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
1033 dbg_hid("weird size of report descriptor (%u)\n", rsize);
1037 rdesc = kmalloc(rsize, GFP_KERNEL);
1041 hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1043 ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1044 HID_DT_REPORT, rdesc, rsize);
1046 dbg_hid("reading report descriptor failed\n");
1051 ret = hid_parse_report(hid, rdesc, rsize);
1054 dbg_hid("parsing report descriptor failed\n");
1058 hid->quirks |= quirks;
1065 static int usbhid_start(struct hid_device *hid)
1067 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1068 struct usb_host_interface *interface = intf->cur_altsetting;
1069 struct usb_device *dev = interface_to_usbdev(intf);
1070 struct usbhid_device *usbhid = hid->driver_data;
1071 unsigned int n, insize = 0;
1074 mutex_lock(&usbhid->mutex);
1076 clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1078 usbhid->bufsize = HID_MIN_BUFFER_SIZE;
1079 hid_find_max_report(hid, HID_INPUT_REPORT, &usbhid->bufsize);
1080 hid_find_max_report(hid, HID_OUTPUT_REPORT, &usbhid->bufsize);
1081 hid_find_max_report(hid, HID_FEATURE_REPORT, &usbhid->bufsize);
1083 if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1084 usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1086 hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1088 if (insize > HID_MAX_BUFFER_SIZE)
1089 insize = HID_MAX_BUFFER_SIZE;
1091 if (hid_alloc_buffers(dev, hid)) {
1096 for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1097 struct usb_endpoint_descriptor *endpoint;
1101 endpoint = &interface->endpoint[n].desc;
1102 if (!usb_endpoint_xfer_int(endpoint))
1105 interval = endpoint->bInterval;
1107 /* Some vendors give fullspeed interval on highspeed devides */
1108 if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
1109 dev->speed == USB_SPEED_HIGH) {
1110 interval = fls(endpoint->bInterval*8);
1111 pr_info("%s: Fixing fullspeed to highspeed interval: %d -> %d\n",
1112 hid->name, endpoint->bInterval, interval);
1115 /* Change the polling interval of mice, joysticks
1118 switch (hid->collection->usage) {
1120 if (hid_mousepoll_interval > 0)
1121 interval = hid_mousepoll_interval;
1123 case HID_GD_JOYSTICK:
1124 if (hid_jspoll_interval > 0)
1125 interval = hid_jspoll_interval;
1127 case HID_GD_KEYBOARD:
1128 if (hid_kbpoll_interval > 0)
1129 interval = hid_kbpoll_interval;
1134 if (usb_endpoint_dir_in(endpoint)) {
1137 if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1139 pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
1140 usb_fill_int_urb(usbhid->urbin, dev, pipe, usbhid->inbuf, insize,
1141 hid_irq_in, hid, interval);
1142 usbhid->urbin->transfer_dma = usbhid->inbuf_dma;
1143 usbhid->urbin->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1147 if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1149 pipe = usb_sndintpipe(dev, endpoint->bEndpointAddress);
1150 usb_fill_int_urb(usbhid->urbout, dev, pipe, usbhid->outbuf, 0,
1151 hid_irq_out, hid, interval);
1152 usbhid->urbout->transfer_dma = usbhid->outbuf_dma;
1153 usbhid->urbout->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1157 usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1158 if (!usbhid->urbctrl) {
1163 usb_fill_control_urb(usbhid->urbctrl, dev, 0, (void *) usbhid->cr,
1164 usbhid->ctrlbuf, 1, hid_ctrl, hid);
1165 usbhid->urbctrl->transfer_dma = usbhid->ctrlbuf_dma;
1166 usbhid->urbctrl->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1168 set_bit(HID_STARTED, &usbhid->iofl);
1170 if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1171 ret = usb_autopm_get_interface(usbhid->intf);
1174 set_bit(HID_IN_POLLING, &usbhid->iofl);
1175 usbhid->intf->needs_remote_wakeup = 1;
1176 ret = hid_start_in(hid);
1179 "failed to start in urb: %d\n", ret);
1181 usb_autopm_put_interface(usbhid->intf);
1184 /* Some keyboards don't work until their LEDs have been set.
1185 * Since BIOSes do set the LEDs, it must be safe for any device
1186 * that supports the keyboard boot protocol.
1187 * In addition, enable remote wakeup by default for all keyboard
1188 * devices supporting the boot protocol.
1190 if (interface->desc.bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT &&
1191 interface->desc.bInterfaceProtocol ==
1192 USB_INTERFACE_PROTOCOL_KEYBOARD) {
1193 usbhid_set_leds(hid);
1194 device_set_wakeup_enable(&dev->dev, 1);
1197 mutex_unlock(&usbhid->mutex);
1201 usb_free_urb(usbhid->urbin);
1202 usb_free_urb(usbhid->urbout);
1203 usb_free_urb(usbhid->urbctrl);
1204 usbhid->urbin = NULL;
1205 usbhid->urbout = NULL;
1206 usbhid->urbctrl = NULL;
1207 hid_free_buffers(dev, hid);
1208 mutex_unlock(&usbhid->mutex);
1212 static void usbhid_stop(struct hid_device *hid)
1214 struct usbhid_device *usbhid = hid->driver_data;
1216 if (WARN_ON(!usbhid))
1219 if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1220 clear_bit(HID_IN_POLLING, &usbhid->iofl);
1221 usbhid->intf->needs_remote_wakeup = 0;
1224 mutex_lock(&usbhid->mutex);
1226 clear_bit(HID_STARTED, &usbhid->iofl);
1227 spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
1228 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1229 spin_unlock_irq(&usbhid->lock);
1230 usb_kill_urb(usbhid->urbin);
1231 usb_kill_urb(usbhid->urbout);
1232 usb_kill_urb(usbhid->urbctrl);
1234 hid_cancel_delayed_stuff(usbhid);
1238 usb_free_urb(usbhid->urbin);
1239 usb_free_urb(usbhid->urbctrl);
1240 usb_free_urb(usbhid->urbout);
1241 usbhid->urbin = NULL; /* don't mess up next start */
1242 usbhid->urbctrl = NULL;
1243 usbhid->urbout = NULL;
1245 hid_free_buffers(hid_to_usb_dev(hid), hid);
1247 mutex_unlock(&usbhid->mutex);
1250 static int usbhid_power(struct hid_device *hid, int lvl)
1252 struct usbhid_device *usbhid = hid->driver_data;
1256 case PM_HINT_FULLON:
1257 r = usb_autopm_get_interface(usbhid->intf);
1260 case PM_HINT_NORMAL:
1261 usb_autopm_put_interface(usbhid->intf);
1268 static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
1271 case HID_REQ_GET_REPORT:
1272 usbhid_submit_report(hid, rep, USB_DIR_IN);
1274 case HID_REQ_SET_REPORT:
1275 usbhid_submit_report(hid, rep, USB_DIR_OUT);
1280 static int usbhid_raw_request(struct hid_device *hid, unsigned char reportnum,
1281 __u8 *buf, size_t len, unsigned char rtype,
1285 case HID_REQ_GET_REPORT:
1286 return usbhid_get_raw_report(hid, reportnum, buf, len, rtype);
1287 case HID_REQ_SET_REPORT:
1288 return usbhid_set_raw_report(hid, reportnum, buf, len, rtype);
1294 static int usbhid_idle(struct hid_device *hid, int report, int idle,
1297 struct usb_device *dev = hid_to_usb_dev(hid);
1298 struct usb_interface *intf = to_usb_interface(hid->dev.parent);
1299 struct usb_host_interface *interface = intf->cur_altsetting;
1300 int ifnum = interface->desc.bInterfaceNumber;
1302 if (reqtype != HID_REQ_SET_IDLE)
1305 return hid_set_idle(dev, ifnum, report, idle);
1308 struct hid_ll_driver usb_hid_driver = {
1309 .parse = usbhid_parse,
1310 .start = usbhid_start,
1311 .stop = usbhid_stop,
1312 .open = usbhid_open,
1313 .close = usbhid_close,
1314 .power = usbhid_power,
1315 .request = usbhid_request,
1316 .wait = usbhid_wait_io,
1317 .raw_request = usbhid_raw_request,
1318 .output_report = usbhid_output_report,
1319 .idle = usbhid_idle,
1321 EXPORT_SYMBOL_GPL(usb_hid_driver);
1323 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1325 struct usb_host_interface *interface = intf->cur_altsetting;
1326 struct usb_device *dev = interface_to_usbdev(intf);
1327 struct usbhid_device *usbhid;
1328 struct hid_device *hid;
1329 unsigned int n, has_in = 0;
1333 dbg_hid("HID probe called for ifnum %d\n",
1334 intf->altsetting->desc.bInterfaceNumber);
1336 for (n = 0; n < interface->desc.bNumEndpoints; n++)
1337 if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1340 hid_err(intf, "couldn't find an input interrupt endpoint\n");
1344 hid = hid_allocate_device();
1346 return PTR_ERR(hid);
1348 usb_set_intfdata(intf, hid);
1349 hid->ll_driver = &usb_hid_driver;
1350 hid->ff_init = hid_pidff_init;
1351 #ifdef CONFIG_USB_HIDDEV
1352 hid->hiddev_connect = hiddev_connect;
1353 hid->hiddev_disconnect = hiddev_disconnect;
1354 hid->hiddev_hid_event = hiddev_hid_event;
1355 hid->hiddev_report_event = hiddev_report_event;
1357 hid->dev.parent = &intf->dev;
1359 hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1360 hid->product = le16_to_cpu(dev->descriptor.idProduct);
1361 hid->version = le16_to_cpu(dev->descriptor.bcdDevice);
1363 if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1364 USB_INTERFACE_PROTOCOL_MOUSE)
1365 hid->type = HID_TYPE_USBMOUSE;
1366 else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1367 hid->type = HID_TYPE_USBNONE;
1369 if (dev->manufacturer)
1370 strlcpy(hid->name, dev->manufacturer, sizeof(hid->name));
1373 if (dev->manufacturer)
1374 strlcat(hid->name, " ", sizeof(hid->name));
1375 strlcat(hid->name, dev->product, sizeof(hid->name));
1378 if (!strlen(hid->name))
1379 snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1380 le16_to_cpu(dev->descriptor.idVendor),
1381 le16_to_cpu(dev->descriptor.idProduct));
1383 usb_make_path(dev, hid->phys, sizeof(hid->phys));
1384 strlcat(hid->phys, "/input", sizeof(hid->phys));
1385 len = strlen(hid->phys);
1386 if (len < sizeof(hid->phys) - 1)
1387 snprintf(hid->phys + len, sizeof(hid->phys) - len,
1388 "%d", intf->altsetting[0].desc.bInterfaceNumber);
1390 if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1393 usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1394 if (usbhid == NULL) {
1399 hid->driver_data = usbhid;
1401 usbhid->intf = intf;
1402 usbhid->ifnum = interface->desc.bInterfaceNumber;
1404 init_waitqueue_head(&usbhid->wait);
1405 INIT_WORK(&usbhid->reset_work, hid_reset);
1406 timer_setup(&usbhid->io_retry, hid_retry_timeout, 0);
1407 spin_lock_init(&usbhid->lock);
1408 mutex_init(&usbhid->mutex);
1410 ret = hid_add_device(hid);
1413 hid_err(intf, "can't add hid device: %d\n", ret);
1421 hid_destroy_device(hid);
1425 static void usbhid_disconnect(struct usb_interface *intf)
1427 struct hid_device *hid = usb_get_intfdata(intf);
1428 struct usbhid_device *usbhid;
1433 usbhid = hid->driver_data;
1434 spin_lock_irq(&usbhid->lock); /* Sync with error and led handlers */
1435 set_bit(HID_DISCONNECTED, &usbhid->iofl);
1436 spin_unlock_irq(&usbhid->lock);
1437 hid_destroy_device(hid);
1441 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1443 del_timer_sync(&usbhid->io_retry);
1444 cancel_work_sync(&usbhid->reset_work);
1447 static void hid_cease_io(struct usbhid_device *usbhid)
1449 del_timer_sync(&usbhid->io_retry);
1450 usb_kill_urb(usbhid->urbin);
1451 usb_kill_urb(usbhid->urbctrl);
1452 usb_kill_urb(usbhid->urbout);
1455 static void hid_restart_io(struct hid_device *hid)
1457 struct usbhid_device *usbhid = hid->driver_data;
1458 int clear_halt = test_bit(HID_CLEAR_HALT, &usbhid->iofl);
1459 int reset_pending = test_bit(HID_RESET_PENDING, &usbhid->iofl);
1461 spin_lock_irq(&usbhid->lock);
1462 clear_bit(HID_SUSPENDED, &usbhid->iofl);
1463 usbhid_mark_busy(usbhid);
1465 if (clear_halt || reset_pending)
1466 schedule_work(&usbhid->reset_work);
1467 usbhid->retry_delay = 0;
1468 spin_unlock_irq(&usbhid->lock);
1470 if (reset_pending || !test_bit(HID_STARTED, &usbhid->iofl))
1474 if (hid_start_in(hid) < 0)
1478 spin_lock_irq(&usbhid->lock);
1479 if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl))
1480 usbhid_restart_out_queue(usbhid);
1481 if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
1482 usbhid_restart_ctrl_queue(usbhid);
1483 spin_unlock_irq(&usbhid->lock);
1486 /* Treat USB reset pretty much the same as suspend/resume */
1487 static int hid_pre_reset(struct usb_interface *intf)
1489 struct hid_device *hid = usb_get_intfdata(intf);
1490 struct usbhid_device *usbhid = hid->driver_data;
1492 spin_lock_irq(&usbhid->lock);
1493 set_bit(HID_RESET_PENDING, &usbhid->iofl);
1494 spin_unlock_irq(&usbhid->lock);
1495 hid_cease_io(usbhid);
1500 /* Same routine used for post_reset and reset_resume */
1501 static int hid_post_reset(struct usb_interface *intf)
1503 struct usb_device *dev = interface_to_usbdev (intf);
1504 struct hid_device *hid = usb_get_intfdata(intf);
1505 struct usbhid_device *usbhid = hid->driver_data;
1506 struct usb_host_interface *interface = intf->cur_altsetting;
1510 /* Fetch and examine the HID report descriptor. If this
1511 * has changed, then rebind. Since usbcore's check of the
1512 * configuration descriptors passed, we already know that
1513 * the size of the HID report descriptor has not changed.
1515 rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL);
1519 status = hid_get_class_descriptor(dev,
1520 interface->desc.bInterfaceNumber,
1521 HID_DT_REPORT, rdesc, hid->dev_rsize);
1523 dbg_hid("reading report descriptor failed (post_reset)\n");
1527 status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize);
1530 dbg_hid("report descriptor changed\n");
1534 /* No need to do another reset or clear a halted endpoint */
1535 spin_lock_irq(&usbhid->lock);
1536 clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1537 clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
1538 spin_unlock_irq(&usbhid->lock);
1539 hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1541 hid_restart_io(hid);
1547 static int hid_resume_common(struct hid_device *hid, bool driver_suspended)
1551 hid_restart_io(hid);
1552 if (driver_suspended && hid->driver && hid->driver->resume)
1553 status = hid->driver->resume(hid);
1557 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1559 struct hid_device *hid = usb_get_intfdata(intf);
1560 struct usbhid_device *usbhid = hid->driver_data;
1562 bool driver_suspended = false;
1563 unsigned int ledcount;
1565 if (PMSG_IS_AUTO(message)) {
1566 ledcount = hidinput_count_leds(hid);
1567 spin_lock_irq(&usbhid->lock); /* Sync with error handler */
1568 if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1569 && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1570 && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1571 && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1572 && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1573 && (!ledcount || ignoreled))
1575 set_bit(HID_SUSPENDED, &usbhid->iofl);
1576 spin_unlock_irq(&usbhid->lock);
1577 if (hid->driver && hid->driver->suspend) {
1578 status = hid->driver->suspend(hid, message);
1582 driver_suspended = true;
1584 usbhid_mark_busy(usbhid);
1585 spin_unlock_irq(&usbhid->lock);
1590 /* TODO: resume() might need to handle suspend failure */
1591 if (hid->driver && hid->driver->suspend)
1592 status = hid->driver->suspend(hid, message);
1593 driver_suspended = true;
1594 spin_lock_irq(&usbhid->lock);
1595 set_bit(HID_SUSPENDED, &usbhid->iofl);
1596 spin_unlock_irq(&usbhid->lock);
1597 if (usbhid_wait_io(hid) < 0)
1601 hid_cancel_delayed_stuff(usbhid);
1602 hid_cease_io(usbhid);
1604 if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1605 /* lost race against keypresses */
1609 dev_dbg(&intf->dev, "suspend\n");
1613 hid_resume_common(hid, driver_suspended);
1617 static int hid_resume(struct usb_interface *intf)
1619 struct hid_device *hid = usb_get_intfdata (intf);
1622 status = hid_resume_common(hid, true);
1623 dev_dbg(&intf->dev, "resume status %d\n", status);
1627 static int hid_reset_resume(struct usb_interface *intf)
1629 struct hid_device *hid = usb_get_intfdata(intf);
1632 status = hid_post_reset(intf);
1633 if (status >= 0 && hid->driver && hid->driver->reset_resume) {
1634 int ret = hid->driver->reset_resume(hid);
1641 #endif /* CONFIG_PM */
1643 static const struct usb_device_id hid_usb_ids[] = {
1644 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1645 .bInterfaceClass = USB_INTERFACE_CLASS_HID },
1646 { } /* Terminating entry */
1649 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1651 static struct usb_driver hid_driver = {
1653 .probe = usbhid_probe,
1654 .disconnect = usbhid_disconnect,
1656 .suspend = hid_suspend,
1657 .resume = hid_resume,
1658 .reset_resume = hid_reset_resume,
1660 .pre_reset = hid_pre_reset,
1661 .post_reset = hid_post_reset,
1662 .id_table = hid_usb_ids,
1663 .supports_autosuspend = 1,
1666 struct usb_interface *usbhid_find_interface(int minor)
1668 return usb_find_interface(&hid_driver, minor);
1671 static int __init hid_init(void)
1673 int retval = -ENOMEM;
1675 retval = hid_quirks_init(quirks_param, BUS_USB, MAX_USBHID_BOOT_QUIRKS);
1677 goto usbhid_quirks_init_fail;
1678 retval = usb_register(&hid_driver);
1680 goto usb_register_fail;
1681 pr_info(KBUILD_MODNAME ": " DRIVER_DESC "\n");
1685 hid_quirks_exit(BUS_USB);
1686 usbhid_quirks_init_fail:
1690 static void __exit hid_exit(void)
1692 usb_deregister(&hid_driver);
1693 hid_quirks_exit(BUS_USB);
1696 module_init(hid_init);
1697 module_exit(hid_exit);
1699 MODULE_AUTHOR("Andreas Gal");
1700 MODULE_AUTHOR("Vojtech Pavlik");
1701 MODULE_AUTHOR("Jiri Kosina");
1702 MODULE_DESCRIPTION(DRIVER_DESC);
1703 MODULE_LICENSE("GPL");