1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  USB HID support for Linux
4  *
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
10  */
11 
12 /*
13  */
14 
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>
20 #include <linux/mm.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>
29 
30 #include <linux/usb.h>
31 
32 #include <linux/hid.h>
33 #include <linux/hiddev.h>
34 #include <linux/hid-debug.h>
35 #include <linux/hidraw.h>
36 #include "usbhid.h"
37 
38 /*
39  * Version Information
40  */
41 
42 #define DRIVER_DESC "USB HID core driver"
43 
44 /*
45  * Module parameters.
46  */
47 
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");
51 
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");
55 
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");
59 
60 static unsigned int ignoreled;
61 module_param_named(ignoreled, ignoreled, uint, 0644);
62 MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
63 
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"
70 		" 0x-prefixed hex");
71 /*
72  * Input submission and I/O error handler.
73  */
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);
78 
79 /* Start up the input URB */
hid_start_in(struct hid_device * hid)80 static int hid_start_in(struct hid_device *hid)
81 {
82 	unsigned long flags;
83 	int rc = 0;
84 	struct usbhid_device *usbhid = hid->driver_data;
85 
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);
92 		if (rc != 0) {
93 			clear_bit(HID_IN_RUNNING, &usbhid->iofl);
94 			if (rc == -ENOSPC)
95 				set_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
96 		} else {
97 			clear_bit(HID_NO_BANDWIDTH, &usbhid->iofl);
98 		}
99 	}
100 	spin_unlock_irqrestore(&usbhid->lock, flags);
101 	return rc;
102 }
103 
104 /* I/O retry timer routine */
hid_retry_timeout(struct timer_list * t)105 static void hid_retry_timeout(struct timer_list *t)
106 {
107 	struct usbhid_device *usbhid = from_timer(usbhid, t, io_retry);
108 	struct hid_device *hid = usbhid->hid;
109 
110 	dev_dbg(&usbhid->intf->dev, "retrying intr urb\n");
111 	if (hid_start_in(hid))
112 		hid_io_error(hid);
113 }
114 
115 /* Workqueue routine to reset the device or clear a halt */
hid_reset(struct work_struct * work)116 static void hid_reset(struct work_struct *work)
117 {
118 	struct usbhid_device *usbhid =
119 		container_of(work, struct usbhid_device, reset_work);
120 	struct hid_device *hid = usbhid->hid;
121 	int rc;
122 
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);
127 		if (rc == 0) {
128 			hid_start_in(hid);
129 		} else {
130 			dev_dbg(&usbhid->intf->dev,
131 					"clear-halt failed: %d\n", rc);
132 			set_bit(HID_RESET_PENDING, &usbhid->iofl);
133 		}
134 	}
135 
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);
139 	}
140 }
141 
142 /* Main I/O error handler */
hid_io_error(struct hid_device * hid)143 static void hid_io_error(struct hid_device *hid)
144 {
145 	unsigned long flags;
146 	struct usbhid_device *usbhid = hid->driver_data;
147 
148 	spin_lock_irqsave(&usbhid->lock, flags);
149 
150 	/* Stop when disconnected */
151 	if (test_bit(HID_DISCONNECTED, &usbhid->iofl))
152 		goto done;
153 
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;
158 
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;
165 
166 	if (time_after(jiffies, usbhid->stop_retry)) {
167 
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)) {
171 
172 			schedule_work(&usbhid->reset_work);
173 			goto done;
174 		}
175 	}
176 
177 	mod_timer(&usbhid->io_retry,
178 			jiffies + msecs_to_jiffies(usbhid->retry_delay));
179 done:
180 	spin_unlock_irqrestore(&usbhid->lock, flags);
181 }
182 
usbhid_mark_busy(struct usbhid_device * usbhid)183 static void usbhid_mark_busy(struct usbhid_device *usbhid)
184 {
185 	struct usb_interface *intf = usbhid->intf;
186 
187 	usb_mark_last_busy(interface_to_usbdev(intf));
188 }
189 
usbhid_restart_out_queue(struct usbhid_device * usbhid)190 static int usbhid_restart_out_queue(struct usbhid_device *usbhid)
191 {
192 	struct hid_device *hid = usb_get_intfdata(usbhid->intf);
193 	int kicked;
194 	int r;
195 
196 	if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
197 			test_bit(HID_SUSPENDED, &usbhid->iofl))
198 		return 0;
199 
200 	if ((kicked = (usbhid->outhead != usbhid->outtail))) {
201 		hid_dbg(hid, "Kicking head %d tail %d", usbhid->outhead, usbhid->outtail);
202 
203 		/* Try to wake up from autosuspend... */
204 		r = usb_autopm_get_interface_async(usbhid->intf);
205 		if (r < 0)
206 			return r;
207 
208 		/*
209 		 * If still suspended, don't submit.  Submission will
210 		 * occur if/when resume drains the queue.
211 		 */
212 		if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
213 			usb_autopm_put_interface_no_suspend(usbhid->intf);
214 			return r;
215 		}
216 
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);
222 		}
223 		wake_up(&usbhid->wait);
224 	}
225 	return kicked;
226 }
227 
usbhid_restart_ctrl_queue(struct usbhid_device * usbhid)228 static int usbhid_restart_ctrl_queue(struct usbhid_device *usbhid)
229 {
230 	struct hid_device *hid = usb_get_intfdata(usbhid->intf);
231 	int kicked;
232 	int r;
233 
234 	WARN_ON(hid == NULL);
235 	if (!hid || test_bit(HID_RESET_PENDING, &usbhid->iofl) ||
236 			test_bit(HID_SUSPENDED, &usbhid->iofl))
237 		return 0;
238 
239 	if ((kicked = (usbhid->ctrlhead != usbhid->ctrltail))) {
240 		hid_dbg(hid, "Kicking head %d tail %d", usbhid->ctrlhead, usbhid->ctrltail);
241 
242 		/* Try to wake up from autosuspend... */
243 		r = usb_autopm_get_interface_async(usbhid->intf);
244 		if (r < 0)
245 			return r;
246 
247 		/*
248 		 * If still suspended, don't submit.  Submission will
249 		 * occur if/when resume drains the queue.
250 		 */
251 		if (test_bit(HID_SUSPENDED, &usbhid->iofl)) {
252 			usb_autopm_put_interface_no_suspend(usbhid->intf);
253 			return r;
254 		}
255 
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);
261 		}
262 		wake_up(&usbhid->wait);
263 	}
264 	return kicked;
265 }
266 
267 /*
268  * Input interrupt completion handler.
269  */
270 
hid_irq_in(struct urb * urb)271 static void hid_irq_in(struct urb *urb)
272 {
273 	struct hid_device	*hid = urb->context;
274 	struct usbhid_device	*usbhid = hid->driver_data;
275 	int			status;
276 
277 	switch (urb->status) {
278 	case 0:			/* success */
279 		usbhid->retry_delay = 0;
280 		if (!test_bit(HID_OPENED, &usbhid->iofl))
281 			break;
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);
287 			/*
288 			 * autosuspend refused while keys are pressed
289 			 * because most keyboards don't wake up when
290 			 * a key is released
291 			 */
292 			if (hid_check_keys_pressed(hid))
293 				set_bit(HID_KEYS_PRESSED, &usbhid->iofl);
294 			else
295 				clear_bit(HID_KEYS_PRESSED, &usbhid->iofl);
296 		}
297 		break;
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);
303 		return;
304 	case -ECONNRESET:	/* unlink */
305 	case -ENOENT:
306 	case -ESHUTDOWN:	/* unplug */
307 		clear_bit(HID_IN_RUNNING, &usbhid->iofl);
308 		return;
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);
315 		hid_io_error(hid);
316 		return;
317 	default:		/* error */
318 		hid_warn(urb->dev, "input irq status %d received\n",
319 			 urb->status);
320 	}
321 
322 	status = usb_submit_urb(urb, GFP_ATOMIC);
323 	if (status) {
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);
330 			hid_io_error(hid);
331 		}
332 	}
333 }
334 
hid_submit_out(struct hid_device * hid)335 static int hid_submit_out(struct hid_device *hid)
336 {
337 	struct hid_report *report;
338 	char *raw_report;
339 	struct usbhid_device *usbhid = hid->driver_data;
340 	int r;
341 
342 	report = usbhid->out[usbhid->outtail].report;
343 	raw_report = usbhid->out[usbhid->outtail].raw_report;
344 
345 	usbhid->urbout->transfer_buffer_length = hid_report_len(report);
346 	usbhid->urbout->dev = hid_to_usb_dev(hid);
347 	if (raw_report) {
348 		memcpy(usbhid->outbuf, raw_report,
349 				usbhid->urbout->transfer_buffer_length);
350 		kfree(raw_report);
351 		usbhid->out[usbhid->outtail].raw_report = NULL;
352 	}
353 
354 	dbg_hid("submitting out urb\n");
355 
356 	r = usb_submit_urb(usbhid->urbout, GFP_ATOMIC);
357 	if (r < 0) {
358 		hid_err(hid, "usb_submit_urb(out) failed: %d\n", r);
359 		return r;
360 	}
361 	usbhid->last_out = jiffies;
362 	return 0;
363 }
364 
hid_submit_ctrl(struct hid_device * hid)365 static int hid_submit_ctrl(struct hid_device *hid)
366 {
367 	struct hid_report *report;
368 	unsigned char dir;
369 	char *raw_report;
370 	int len, r;
371 	struct usbhid_device *usbhid = hid->driver_data;
372 
373 	report = usbhid->ctrl[usbhid->ctrltail].report;
374 	raw_report = usbhid->ctrl[usbhid->ctrltail].raw_report;
375 	dir = usbhid->ctrl[usbhid->ctrltail].dir;
376 
377 	len = hid_report_len(report);
378 	if (dir == USB_DIR_OUT) {
379 		usbhid->urbctrl->pipe = usb_sndctrlpipe(hid_to_usb_dev(hid), 0);
380 		if (raw_report) {
381 			memcpy(usbhid->ctrlbuf, raw_report, len);
382 			kfree(raw_report);
383 			usbhid->ctrl[usbhid->ctrltail].raw_report = NULL;
384 		}
385 	} else {
386 		int maxpacket;
387 
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);
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;
395 	}
396 	usbhid->urbctrl->transfer_buffer_length = len;
397 	usbhid->urbctrl->dev = hid_to_usb_dev(hid);
398 
399 	usbhid->cr->bRequestType = USB_TYPE_CLASS | USB_RECIP_INTERFACE | dir;
400 	usbhid->cr->bRequest = (dir == USB_DIR_OUT) ? HID_REQ_SET_REPORT :
401 						      HID_REQ_GET_REPORT;
402 	usbhid->cr->wValue = cpu_to_le16(((report->type + 1) << 8) |
403 					 report->id);
404 	usbhid->cr->wIndex = cpu_to_le16(usbhid->ifnum);
405 	usbhid->cr->wLength = cpu_to_le16(len);
406 
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" :
409 							     "Get_Report",
410 		usbhid->cr->wValue, usbhid->cr->wIndex, usbhid->cr->wLength);
411 
412 	r = usb_submit_urb(usbhid->urbctrl, GFP_ATOMIC);
413 	if (r < 0) {
414 		hid_err(hid, "usb_submit_urb(ctrl) failed: %d\n", r);
415 		return r;
416 	}
417 	usbhid->last_ctrl = jiffies;
418 	return 0;
419 }
420 
421 /*
422  * Output interrupt completion handler.
423  */
424 
hid_irq_out(struct urb * urb)425 static void hid_irq_out(struct urb *urb)
426 {
427 	struct hid_device *hid = urb->context;
428 	struct usbhid_device *usbhid = hid->driver_data;
429 	unsigned long flags;
430 	int unplug = 0;
431 
432 	switch (urb->status) {
433 	case 0:			/* success */
434 		break;
435 	case -ESHUTDOWN:	/* unplug */
436 		unplug = 1;
437 		break;
438 	case -EILSEQ:		/* protocol error or unplug */
439 	case -EPROTO:		/* protocol error or unplug */
440 	case -ECONNRESET:	/* unlink */
441 	case -ENOENT:
442 		break;
443 	default:		/* error */
444 		hid_warn(urb->dev, "output irq status %d received\n",
445 			 urb->status);
446 	}
447 
448 	spin_lock_irqsave(&usbhid->lock, flags);
449 
450 	if (unplug) {
451 		usbhid->outtail = usbhid->outhead;
452 	} else {
453 		usbhid->outtail = (usbhid->outtail + 1) & (HID_OUTPUT_FIFO_SIZE - 1);
454 
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);
459 			return;
460 		}
461 	}
462 
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);
467 }
468 
469 /*
470  * Control pipe completion handler.
471  */
472 
hid_ctrl(struct urb * urb)473 static void hid_ctrl(struct urb *urb)
474 {
475 	struct hid_device *hid = urb->context;
476 	struct usbhid_device *usbhid = hid->driver_data;
477 	unsigned long flags;
478 	int unplug = 0, status = urb->status;
479 
480 	switch (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);
486 		break;
487 	case -ESHUTDOWN:	/* unplug */
488 		unplug = 1;
489 		break;
490 	case -EILSEQ:		/* protocol error or unplug */
491 	case -EPROTO:		/* protocol error or unplug */
492 	case -ECONNRESET:	/* unlink */
493 	case -ENOENT:
494 	case -EPIPE:		/* report not available */
495 		break;
496 	default:		/* error */
497 		hid_warn(urb->dev, "ctrl urb status %d received\n", status);
498 	}
499 
500 	spin_lock_irqsave(&usbhid->lock, flags);
501 
502 	if (unplug) {
503 		usbhid->ctrltail = usbhid->ctrlhead;
504 	} else if (usbhid->ctrlhead != usbhid->ctrltail) {
505 		usbhid->ctrltail = (usbhid->ctrltail + 1) & (HID_CONTROL_FIFO_SIZE - 1);
506 
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);
511 			return;
512 		}
513 	}
514 
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);
519 }
520 
__usbhid_submit_report(struct hid_device * hid,struct hid_report * report,unsigned char dir)521 static void __usbhid_submit_report(struct hid_device *hid, struct hid_report *report,
522 				   unsigned char dir)
523 {
524 	int head;
525 	struct usbhid_device *usbhid = hid->driver_data;
526 
527 	if (((hid->quirks & HID_QUIRK_NOGET) && dir == USB_DIR_IN) ||
528 		test_bit(HID_DISCONNECTED, &usbhid->iofl))
529 		return;
530 
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");
534 			return;
535 		}
536 
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");
540 			return;
541 		}
542 		hid_output_report(report, usbhid->out[usbhid->outhead].raw_report);
543 		usbhid->out[usbhid->outhead].report = report;
544 		usbhid->outhead = head;
545 
546 		/* If the queue isn't running, restart it */
547 		if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl)) {
548 			usbhid_restart_out_queue(usbhid);
549 
550 		/* Otherwise see if an earlier request has timed out */
551 		} else if (time_after(jiffies, usbhid->last_out + HZ * 5)) {
552 
553 			/* Prevent autosuspend following the unlink */
554 			usb_autopm_get_interface_no_resume(usbhid->intf);
555 
556 			/*
557 			 * Prevent resubmission in case the URB completes
558 			 * before we can unlink it.  We don't want to cancel
559 			 * the wrong transfer!
560 			 */
561 			usb_block_urb(usbhid->urbout);
562 
563 			/* Drop lock to avoid deadlock if the callback runs */
564 			spin_unlock(&usbhid->lock);
565 
566 			usb_unlink_urb(usbhid->urbout);
567 			spin_lock(&usbhid->lock);
568 			usb_unblock_urb(usbhid->urbout);
569 
570 			/* Unlink might have stopped the queue */
571 			if (!test_bit(HID_OUT_RUNNING, &usbhid->iofl))
572 				usbhid_restart_out_queue(usbhid);
573 
574 			/* Now we can allow autosuspend again */
575 			usb_autopm_put_interface_async(usbhid->intf);
576 		}
577 		return;
578 	}
579 
580 	if ((head = (usbhid->ctrlhead + 1) & (HID_CONTROL_FIFO_SIZE - 1)) == usbhid->ctrltail) {
581 		hid_warn(hid, "control queue full\n");
582 		return;
583 	}
584 
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");
589 			return;
590 		}
591 		hid_output_report(report, usbhid->ctrl[usbhid->ctrlhead].raw_report);
592 	}
593 	usbhid->ctrl[usbhid->ctrlhead].report = report;
594 	usbhid->ctrl[usbhid->ctrlhead].dir = dir;
595 	usbhid->ctrlhead = head;
596 
597 	/* If the queue isn't running, restart it */
598 	if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl)) {
599 		usbhid_restart_ctrl_queue(usbhid);
600 
601 	/* Otherwise see if an earlier request has timed out */
602 	} else if (time_after(jiffies, usbhid->last_ctrl + HZ * 5)) {
603 
604 		/* Prevent autosuspend following the unlink */
605 		usb_autopm_get_interface_no_resume(usbhid->intf);
606 
607 		/*
608 		 * Prevent resubmission in case the URB completes
609 		 * before we can unlink it.  We don't want to cancel
610 		 * the wrong transfer!
611 		 */
612 		usb_block_urb(usbhid->urbctrl);
613 
614 		/* Drop lock to avoid deadlock if the callback runs */
615 		spin_unlock(&usbhid->lock);
616 
617 		usb_unlink_urb(usbhid->urbctrl);
618 		spin_lock(&usbhid->lock);
619 		usb_unblock_urb(usbhid->urbctrl);
620 
621 		/* Unlink might have stopped the queue */
622 		if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
623 			usbhid_restart_ctrl_queue(usbhid);
624 
625 		/* Now we can allow autosuspend again */
626 		usb_autopm_put_interface_async(usbhid->intf);
627 	}
628 }
629 
usbhid_submit_report(struct hid_device * hid,struct hid_report * report,unsigned char dir)630 static void usbhid_submit_report(struct hid_device *hid, struct hid_report *report, unsigned char dir)
631 {
632 	struct usbhid_device *usbhid = hid->driver_data;
633 	unsigned long flags;
634 
635 	spin_lock_irqsave(&usbhid->lock, flags);
636 	__usbhid_submit_report(hid, report, dir);
637 	spin_unlock_irqrestore(&usbhid->lock, flags);
638 }
639 
usbhid_wait_io(struct hid_device * hid)640 static int usbhid_wait_io(struct hid_device *hid)
641 {
642 	struct usbhid_device *usbhid = hid->driver_data;
643 
644 	if (!wait_event_timeout(usbhid->wait,
645 				(!test_bit(HID_CTRL_RUNNING, &usbhid->iofl) &&
646 				!test_bit(HID_OUT_RUNNING, &usbhid->iofl)),
647 					10*HZ)) {
648 		dbg_hid("timeout waiting for ctrl or out queue to clear\n");
649 		return -1;
650 	}
651 
652 	return 0;
653 }
654 
hid_set_idle(struct usb_device * dev,int ifnum,int report,int idle)655 static int hid_set_idle(struct usb_device *dev, int ifnum, int report, int idle)
656 {
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);
660 }
661 
hid_get_class_descriptor(struct usb_device * dev,int ifnum,unsigned char type,void * buf,int size)662 static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
663 		unsigned char type, void *buf, int size)
664 {
665 	int result, retries = 4;
666 
667 	memset(buf, 0, size);
668 
669 	do {
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);
673 		retries--;
674 	} while (result < size && retries);
675 	return result;
676 }
677 
usbhid_open(struct hid_device * hid)678 static int usbhid_open(struct hid_device *hid)
679 {
680 	struct usbhid_device *usbhid = hid->driver_data;
681 	int res;
682 
683 	mutex_lock(&usbhid->mutex);
684 
685 	set_bit(HID_OPENED, &usbhid->iofl);
686 
687 	if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
688 		res = 0;
689 		goto Done;
690 	}
691 
692 	res = usb_autopm_get_interface(usbhid->intf);
693 	/* the device must be awake to reliably request remote wakeup */
694 	if (res < 0) {
695 		clear_bit(HID_OPENED, &usbhid->iofl);
696 		res = -EIO;
697 		goto Done;
698 	}
699 
700 	usbhid->intf->needs_remote_wakeup = 1;
701 
702 	set_bit(HID_RESUME_RUNNING, &usbhid->iofl);
703 	set_bit(HID_IN_POLLING, &usbhid->iofl);
704 
705 	res = hid_start_in(hid);
706 	if (res) {
707 		if (res != -ENOSPC) {
708 			hid_io_error(hid);
709 			res = 0;
710 		} else {
711 			/* no use opening if resources are insufficient */
712 			res = -EBUSY;
713 			clear_bit(HID_OPENED, &usbhid->iofl);
714 			clear_bit(HID_IN_POLLING, &usbhid->iofl);
715 			usbhid->intf->needs_remote_wakeup = 0;
716 		}
717 	}
718 
719 	usb_autopm_put_interface(usbhid->intf);
720 
721 	/*
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
725 	 * to go through hid.
726 	 */
727 	if (res == 0)
728 		msleep(50);
729 
730 	clear_bit(HID_RESUME_RUNNING, &usbhid->iofl);
731 
732  Done:
733 	mutex_unlock(&usbhid->mutex);
734 	return res;
735 }
736 
usbhid_close(struct hid_device * hid)737 static void usbhid_close(struct hid_device *hid)
738 {
739 	struct usbhid_device *usbhid = hid->driver_data;
740 
741 	mutex_lock(&usbhid->mutex);
742 
743 	/*
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().
747 	 */
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);
753 
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;
758 	}
759 
760 	mutex_unlock(&usbhid->mutex);
761 }
762 
763 /*
764  * Initialize all reports
765  */
766 
usbhid_init_reports(struct hid_device * hid)767 void usbhid_init_reports(struct hid_device *hid)
768 {
769 	struct hid_report *report;
770 	struct usbhid_device *usbhid = hid->driver_data;
771 	struct hid_report_enum *report_enum;
772 	int err, ret;
773 
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);
777 
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);
781 
782 	err = 0;
783 	ret = usbhid_wait_io(hid);
784 	while (ret) {
785 		err |= ret;
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);
791 	}
792 
793 	if (err)
794 		hid_warn(hid, "timeout initializing reports\n");
795 }
796 
797 /*
798  * Reset LEDs which BIOS might have left on. For now, just NumLock (0x01).
799  */
hid_find_field_early(struct hid_device * hid,unsigned int page,unsigned int hid_code,struct hid_field ** pfield)800 static int hid_find_field_early(struct hid_device *hid, unsigned int page,
801     unsigned int hid_code, struct hid_field **pfield)
802 {
803 	struct hid_report *report;
804 	struct hid_field *field;
805 	struct hid_usage *usage;
806 	int i, j;
807 
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) {
815 					*pfield = field;
816 					return j;
817 				}
818 			}
819 		}
820 	}
821 	return -1;
822 }
823 
usbhid_set_leds(struct hid_device * hid)824 static void usbhid_set_leds(struct hid_device *hid)
825 {
826 	struct hid_field *field;
827 	int offset;
828 
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);
832 	}
833 }
834 
835 /*
836  * Traverse the supplied list of reports and find the longest
837  */
hid_find_max_report(struct hid_device * hid,unsigned int type,unsigned int * max)838 static void hid_find_max_report(struct hid_device *hid, unsigned int type,
839 		unsigned int *max)
840 {
841 	struct hid_report *report;
842 	unsigned int size;
843 
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;
846 		if (*max < size)
847 			*max = size;
848 	}
849 }
850 
hid_alloc_buffers(struct usb_device * dev,struct hid_device * hid)851 static int hid_alloc_buffers(struct usb_device *dev, struct hid_device *hid)
852 {
853 	struct usbhid_device *usbhid = hid->driver_data;
854 
855 	usbhid->inbuf = usb_alloc_coherent(dev, usbhid->bufsize, GFP_KERNEL,
856 			&usbhid->inbuf_dma);
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 ||
863 			!usbhid->ctrlbuf)
864 		return -1;
865 
866 	return 0;
867 }
868 
usbhid_get_raw_report(struct hid_device * hid,unsigned char report_number,__u8 * buf,size_t count,unsigned char report_type)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)
872 {
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;
878 	int ret;
879 
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. */
885 		buf++;
886 		count--;
887 		skipped_report_id = 1;
888 	}
889 	ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
890 		HID_REQ_GET_REPORT,
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);
895 
896 	/* count also the report id */
897 	if (ret > 0 && skipped_report_id)
898 		ret++;
899 
900 	return ret;
901 }
902 
usbhid_set_raw_report(struct hid_device * hid,unsigned int reportnum,__u8 * buf,size_t count,unsigned char rtype)903 static int usbhid_set_raw_report(struct hid_device *hid, unsigned int reportnum,
904 				 __u8 *buf, size_t count, unsigned char rtype)
905 {
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;
911 
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))
915 		buf[0] = 0;
916 	else
917 		buf[0] = reportnum;
918 
919 	if (buf[0] == 0x0) {
920 		/* Don't send the Report ID */
921 		buf++;
922 		count--;
923 		skipped_report_id = 1;
924 	}
925 
926 	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
927 			HID_REQ_SET_REPORT,
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)
934 		ret++;
935 
936 	return ret;
937 }
938 
usbhid_output_report(struct hid_device * hid,__u8 * buf,size_t count)939 static int usbhid_output_report(struct hid_device *hid, __u8 *buf, size_t count)
940 {
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;
944 
945 	if (!usbhid->urbout)
946 		return -ENOSYS;
947 
948 	if (buf[0] == 0x0) {
949 		/* Don't send the Report ID */
950 		buf++;
951 		count--;
952 		skipped_report_id = 1;
953 	}
954 
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 */
959 	if (ret == 0) {
960 		ret = actual_length;
961 		/* count also the report id */
962 		if (skipped_report_id)
963 			ret++;
964 	}
965 
966 	return ret;
967 }
968 
hid_free_buffers(struct usb_device * dev,struct hid_device * hid)969 static void hid_free_buffers(struct usb_device *dev, struct hid_device *hid)
970 {
971 	struct usbhid_device *usbhid = hid->driver_data;
972 
973 	usb_free_coherent(dev, usbhid->bufsize, usbhid->inbuf, usbhid->inbuf_dma);
974 	usb_free_coherent(dev, usbhid->bufsize, usbhid->outbuf, usbhid->outbuf_dma);
975 	kfree(usbhid->cr);
976 	usb_free_coherent(dev, usbhid->bufsize, usbhid->ctrlbuf, usbhid->ctrlbuf_dma);
977 }
978 
usbhid_parse(struct hid_device * hid)979 static int usbhid_parse(struct hid_device *hid)
980 {
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;
985 	u32 quirks = 0;
986 	unsigned int rsize = 0;
987 	char *rdesc;
988 	int ret, n;
989 	int num_descriptors;
990 	size_t offset = offsetof(struct hid_descriptor, desc);
991 
992 	quirks = hid_lookup_quirk(hid);
993 
994 	if (quirks & HID_QUIRK_IGNORE)
995 		return -ENODEV;
996 
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;
1003 	}
1004 
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");
1009 		return -ENODEV;
1010 	}
1011 
1012 	if (hdesc->bLength < sizeof(struct hid_descriptor)) {
1013 		dbg_hid("hid descriptor is too short\n");
1014 		return -EINVAL;
1015 	}
1016 
1017 	hid->version = le16_to_cpu(hdesc->bcdHID);
1018 	hid->country = hdesc->bCountryCode;
1019 
1020 	num_descriptors = min_t(int, hdesc->bNumDescriptors,
1021 	       (hdesc->bLength - offset) / sizeof(struct hid_class_descriptor));
1022 
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);
1026 
1027 	if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
1028 		dbg_hid("weird size of report descriptor (%u)\n", rsize);
1029 		return -EINVAL;
1030 	}
1031 
1032 	rdesc = kmalloc(rsize, GFP_KERNEL);
1033 	if (!rdesc)
1034 		return -ENOMEM;
1035 
1036 	hid_set_idle(dev, interface->desc.bInterfaceNumber, 0, 0);
1037 
1038 	ret = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber,
1039 			HID_DT_REPORT, rdesc, rsize);
1040 	if (ret < 0) {
1041 		dbg_hid("reading report descriptor failed\n");
1042 		kfree(rdesc);
1043 		goto err;
1044 	}
1045 
1046 	ret = hid_parse_report(hid, rdesc, rsize);
1047 	kfree(rdesc);
1048 	if (ret) {
1049 		dbg_hid("parsing report descriptor failed\n");
1050 		goto err;
1051 	}
1052 
1053 	hid->quirks |= quirks;
1054 
1055 	return 0;
1056 err:
1057 	return ret;
1058 }
1059 
usbhid_start(struct hid_device * hid)1060 static int usbhid_start(struct hid_device *hid)
1061 {
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;
1067 	int ret;
1068 
1069 	mutex_lock(&usbhid->mutex);
1070 
1071 	clear_bit(HID_DISCONNECTED, &usbhid->iofl);
1072 
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);
1077 
1078 	if (usbhid->bufsize > HID_MAX_BUFFER_SIZE)
1079 		usbhid->bufsize = HID_MAX_BUFFER_SIZE;
1080 
1081 	hid_find_max_report(hid, HID_INPUT_REPORT, &insize);
1082 
1083 	if (insize > HID_MAX_BUFFER_SIZE)
1084 		insize = HID_MAX_BUFFER_SIZE;
1085 
1086 	if (hid_alloc_buffers(dev, hid)) {
1087 		ret = -ENOMEM;
1088 		goto fail;
1089 	}
1090 
1091 	for (n = 0; n < interface->desc.bNumEndpoints; n++) {
1092 		struct usb_endpoint_descriptor *endpoint;
1093 		int pipe;
1094 		int interval;
1095 
1096 		endpoint = &interface->endpoint[n].desc;
1097 		if (!usb_endpoint_xfer_int(endpoint))
1098 			continue;
1099 
1100 		interval = endpoint->bInterval;
1101 
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);
1108 		}
1109 
1110 		/* Change the polling interval of mice, joysticks
1111 		 * and keyboards.
1112 		 */
1113 		switch (hid->collection->usage) {
1114 		case HID_GD_MOUSE:
1115 			if (hid_mousepoll_interval > 0)
1116 				interval = hid_mousepoll_interval;
1117 			break;
1118 		case HID_GD_JOYSTICK:
1119 			if (hid_jspoll_interval > 0)
1120 				interval = hid_jspoll_interval;
1121 			break;
1122 		case HID_GD_KEYBOARD:
1123 			if (hid_kbpoll_interval > 0)
1124 				interval = hid_kbpoll_interval;
1125 			break;
1126 		}
1127 
1128 		ret = -ENOMEM;
1129 		if (usb_endpoint_dir_in(endpoint)) {
1130 			if (usbhid->urbin)
1131 				continue;
1132 			if (!(usbhid->urbin = usb_alloc_urb(0, GFP_KERNEL)))
1133 				goto fail;
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;
1139 		} else {
1140 			if (usbhid->urbout)
1141 				continue;
1142 			if (!(usbhid->urbout = usb_alloc_urb(0, GFP_KERNEL)))
1143 				goto fail;
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;
1149 		}
1150 	}
1151 
1152 	usbhid->urbctrl = usb_alloc_urb(0, GFP_KERNEL);
1153 	if (!usbhid->urbctrl) {
1154 		ret = -ENOMEM;
1155 		goto fail;
1156 	}
1157 
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;
1162 
1163 	set_bit(HID_STARTED, &usbhid->iofl);
1164 
1165 	if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1166 		ret = usb_autopm_get_interface(usbhid->intf);
1167 		if (ret)
1168 			goto fail;
1169 		set_bit(HID_IN_POLLING, &usbhid->iofl);
1170 		usbhid->intf->needs_remote_wakeup = 1;
1171 		ret = hid_start_in(hid);
1172 		if (ret) {
1173 			dev_err(&hid->dev,
1174 				"failed to start in urb: %d\n", ret);
1175 		}
1176 		usb_autopm_put_interface(usbhid->intf);
1177 	}
1178 
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.
1184 	 */
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);
1190 	}
1191 
1192 	mutex_unlock(&usbhid->mutex);
1193 	return 0;
1194 
1195 fail:
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);
1204 	return ret;
1205 }
1206 
usbhid_stop(struct hid_device * hid)1207 static void usbhid_stop(struct hid_device *hid)
1208 {
1209 	struct usbhid_device *usbhid = hid->driver_data;
1210 
1211 	if (WARN_ON(!usbhid))
1212 		return;
1213 
1214 	if (hid->quirks & HID_QUIRK_ALWAYS_POLL) {
1215 		clear_bit(HID_IN_POLLING, &usbhid->iofl);
1216 		usbhid->intf->needs_remote_wakeup = 0;
1217 	}
1218 
1219 	mutex_lock(&usbhid->mutex);
1220 
1221 	clear_bit(HID_STARTED, &usbhid->iofl);
1222 
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;
1229 		}
1230 
1231 		usbhid->ctrltail = (usbhid->ctrltail + 1) &
1232 			(HID_CONTROL_FIFO_SIZE - 1);
1233 	}
1234 	spin_unlock_irq(&usbhid->lock);
1235 
1236 	usb_kill_urb(usbhid->urbin);
1237 	usb_kill_urb(usbhid->urbout);
1238 	usb_kill_urb(usbhid->urbctrl);
1239 
1240 	hid_cancel_delayed_stuff(usbhid);
1241 
1242 	hid->claimed = 0;
1243 
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;
1250 
1251 	hid_free_buffers(hid_to_usb_dev(hid), hid);
1252 
1253 	mutex_unlock(&usbhid->mutex);
1254 }
1255 
usbhid_power(struct hid_device * hid,int lvl)1256 static int usbhid_power(struct hid_device *hid, int lvl)
1257 {
1258 	struct usbhid_device *usbhid = hid->driver_data;
1259 	int r = 0;
1260 
1261 	switch (lvl) {
1262 	case PM_HINT_FULLON:
1263 		r = usb_autopm_get_interface(usbhid->intf);
1264 		break;
1265 
1266 	case PM_HINT_NORMAL:
1267 		usb_autopm_put_interface(usbhid->intf);
1268 		break;
1269 	}
1270 
1271 	return r;
1272 }
1273 
usbhid_request(struct hid_device * hid,struct hid_report * rep,int reqtype)1274 static void usbhid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
1275 {
1276 	switch (reqtype) {
1277 	case HID_REQ_GET_REPORT:
1278 		usbhid_submit_report(hid, rep, USB_DIR_IN);
1279 		break;
1280 	case HID_REQ_SET_REPORT:
1281 		usbhid_submit_report(hid, rep, USB_DIR_OUT);
1282 		break;
1283 	}
1284 }
1285 
usbhid_raw_request(struct hid_device * hid,unsigned char reportnum,__u8 * buf,size_t len,unsigned char rtype,int reqtype)1286 static int usbhid_raw_request(struct hid_device *hid, unsigned char reportnum,
1287 			      __u8 *buf, size_t len, unsigned char rtype,
1288 			      int reqtype)
1289 {
1290 	switch (reqtype) {
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);
1295 	default:
1296 		return -EIO;
1297 	}
1298 }
1299 
usbhid_idle(struct hid_device * hid,int report,int idle,int reqtype)1300 static int usbhid_idle(struct hid_device *hid, int report, int idle,
1301 		int reqtype)
1302 {
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;
1307 
1308 	if (reqtype != HID_REQ_SET_IDLE)
1309 		return -EINVAL;
1310 
1311 	return hid_set_idle(dev, ifnum, report, idle);
1312 }
1313 
usbhid_may_wakeup(struct hid_device * hid)1314 static bool usbhid_may_wakeup(struct hid_device *hid)
1315 {
1316 	struct usb_device *dev = hid_to_usb_dev(hid);
1317 
1318 	return device_may_wakeup(&dev->dev);
1319 }
1320 
1321 static const 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,
1334 };
1335 
hid_is_usb(const struct hid_device * hdev)1336 bool hid_is_usb(const struct hid_device *hdev)
1337 {
1338 	return hdev->ll_driver == &usb_hid_driver;
1339 }
1340 EXPORT_SYMBOL_GPL(hid_is_usb);
1341 
usbhid_probe(struct usb_interface * intf,const struct usb_device_id * id)1342 static int usbhid_probe(struct usb_interface *intf, const struct usb_device_id *id)
1343 {
1344 	struct usb_host_interface *interface = intf->cur_altsetting;
1345 	struct usb_device *dev = interface_to_usbdev(intf);
1346 	struct usbhid_device *usbhid;
1347 	struct hid_device *hid;
1348 	unsigned int n, has_in = 0;
1349 	size_t len;
1350 	int ret;
1351 
1352 	dbg_hid("HID probe called for ifnum %d\n",
1353 			intf->altsetting->desc.bInterfaceNumber);
1354 
1355 	for (n = 0; n < interface->desc.bNumEndpoints; n++)
1356 		if (usb_endpoint_is_int_in(&interface->endpoint[n].desc))
1357 			has_in++;
1358 	if (!has_in) {
1359 		hid_err(intf, "couldn't find an input interrupt endpoint\n");
1360 		return -ENODEV;
1361 	}
1362 
1363 	hid = hid_allocate_device();
1364 	if (IS_ERR(hid))
1365 		return PTR_ERR(hid);
1366 
1367 	usb_set_intfdata(intf, hid);
1368 	hid->ll_driver = &usb_hid_driver;
1369 	hid->ff_init = hid_pidff_init;
1370 #ifdef CONFIG_USB_HIDDEV
1371 	hid->hiddev_connect = hiddev_connect;
1372 	hid->hiddev_disconnect = hiddev_disconnect;
1373 	hid->hiddev_hid_event = hiddev_hid_event;
1374 	hid->hiddev_report_event = hiddev_report_event;
1375 #endif
1376 	hid->dev.parent = &intf->dev;
1377 	hid->bus = BUS_USB;
1378 	hid->vendor = le16_to_cpu(dev->descriptor.idVendor);
1379 	hid->product = le16_to_cpu(dev->descriptor.idProduct);
1380 	hid->version = le16_to_cpu(dev->descriptor.bcdDevice);
1381 	hid->name[0] = 0;
1382 	if (intf->cur_altsetting->desc.bInterfaceProtocol ==
1383 			USB_INTERFACE_PROTOCOL_MOUSE)
1384 		hid->type = HID_TYPE_USBMOUSE;
1385 	else if (intf->cur_altsetting->desc.bInterfaceProtocol == 0)
1386 		hid->type = HID_TYPE_USBNONE;
1387 
1388 	if (dev->manufacturer)
1389 		strscpy(hid->name, dev->manufacturer, sizeof(hid->name));
1390 
1391 	if (dev->product) {
1392 		if (dev->manufacturer)
1393 			strlcat(hid->name, " ", sizeof(hid->name));
1394 		strlcat(hid->name, dev->product, sizeof(hid->name));
1395 	}
1396 
1397 	if (!strlen(hid->name))
1398 		snprintf(hid->name, sizeof(hid->name), "HID %04x:%04x",
1399 			 le16_to_cpu(dev->descriptor.idVendor),
1400 			 le16_to_cpu(dev->descriptor.idProduct));
1401 
1402 	usb_make_path(dev, hid->phys, sizeof(hid->phys));
1403 	strlcat(hid->phys, "/input", sizeof(hid->phys));
1404 	len = strlen(hid->phys);
1405 	if (len < sizeof(hid->phys) - 1)
1406 		snprintf(hid->phys + len, sizeof(hid->phys) - len,
1407 			 "%d", intf->altsetting[0].desc.bInterfaceNumber);
1408 
1409 	if (usb_string(dev, dev->descriptor.iSerialNumber, hid->uniq, 64) <= 0)
1410 		hid->uniq[0] = 0;
1411 
1412 	usbhid = kzalloc(sizeof(*usbhid), GFP_KERNEL);
1413 	if (usbhid == NULL) {
1414 		ret = -ENOMEM;
1415 		goto err;
1416 	}
1417 
1418 	hid->driver_data = usbhid;
1419 	usbhid->hid = hid;
1420 	usbhid->intf = intf;
1421 	usbhid->ifnum = interface->desc.bInterfaceNumber;
1422 
1423 	init_waitqueue_head(&usbhid->wait);
1424 	INIT_WORK(&usbhid->reset_work, hid_reset);
1425 	timer_setup(&usbhid->io_retry, hid_retry_timeout, 0);
1426 	spin_lock_init(&usbhid->lock);
1427 	mutex_init(&usbhid->mutex);
1428 
1429 	ret = hid_add_device(hid);
1430 	if (ret) {
1431 		if (ret != -ENODEV)
1432 			hid_err(intf, "can't add hid device: %d\n", ret);
1433 		goto err_free;
1434 	}
1435 
1436 	return 0;
1437 err_free:
1438 	kfree(usbhid);
1439 err:
1440 	hid_destroy_device(hid);
1441 	return ret;
1442 }
1443 
usbhid_disconnect(struct usb_interface * intf)1444 static void usbhid_disconnect(struct usb_interface *intf)
1445 {
1446 	struct hid_device *hid = usb_get_intfdata(intf);
1447 	struct usbhid_device *usbhid;
1448 
1449 	if (WARN_ON(!hid))
1450 		return;
1451 
1452 	usbhid = hid->driver_data;
1453 	spin_lock_irq(&usbhid->lock);	/* Sync with error and led handlers */
1454 	set_bit(HID_DISCONNECTED, &usbhid->iofl);
1455 	spin_unlock_irq(&usbhid->lock);
1456 	hid_destroy_device(hid);
1457 	kfree(usbhid);
1458 }
1459 
hid_cancel_delayed_stuff(struct usbhid_device * usbhid)1460 static void hid_cancel_delayed_stuff(struct usbhid_device *usbhid)
1461 {
1462 	del_timer_sync(&usbhid->io_retry);
1463 	cancel_work_sync(&usbhid->reset_work);
1464 }
1465 
hid_cease_io(struct usbhid_device * usbhid)1466 static void hid_cease_io(struct usbhid_device *usbhid)
1467 {
1468 	del_timer_sync(&usbhid->io_retry);
1469 	usb_kill_urb(usbhid->urbin);
1470 	usb_kill_urb(usbhid->urbctrl);
1471 	usb_kill_urb(usbhid->urbout);
1472 }
1473 
hid_restart_io(struct hid_device * hid)1474 static void hid_restart_io(struct hid_device *hid)
1475 {
1476 	struct usbhid_device *usbhid = hid->driver_data;
1477 	int clear_halt = test_bit(HID_CLEAR_HALT, &usbhid->iofl);
1478 	int reset_pending = test_bit(HID_RESET_PENDING, &usbhid->iofl);
1479 
1480 	spin_lock_irq(&usbhid->lock);
1481 	clear_bit(HID_SUSPENDED, &usbhid->iofl);
1482 	usbhid_mark_busy(usbhid);
1483 
1484 	if (clear_halt || reset_pending)
1485 		schedule_work(&usbhid->reset_work);
1486 	usbhid->retry_delay = 0;
1487 	spin_unlock_irq(&usbhid->lock);
1488 
1489 	if (reset_pending || !test_bit(HID_STARTED, &usbhid->iofl))
1490 		return;
1491 
1492 	if (!clear_halt) {
1493 		if (hid_start_in(hid) < 0)
1494 			hid_io_error(hid);
1495 	}
1496 
1497 	spin_lock_irq(&usbhid->lock);
1498 	if (usbhid->urbout && !test_bit(HID_OUT_RUNNING, &usbhid->iofl))
1499 		usbhid_restart_out_queue(usbhid);
1500 	if (!test_bit(HID_CTRL_RUNNING, &usbhid->iofl))
1501 		usbhid_restart_ctrl_queue(usbhid);
1502 	spin_unlock_irq(&usbhid->lock);
1503 }
1504 
1505 /* Treat USB reset pretty much the same as suspend/resume */
hid_pre_reset(struct usb_interface * intf)1506 static int hid_pre_reset(struct usb_interface *intf)
1507 {
1508 	struct hid_device *hid = usb_get_intfdata(intf);
1509 	struct usbhid_device *usbhid = hid->driver_data;
1510 
1511 	spin_lock_irq(&usbhid->lock);
1512 	set_bit(HID_RESET_PENDING, &usbhid->iofl);
1513 	spin_unlock_irq(&usbhid->lock);
1514 	hid_cease_io(usbhid);
1515 
1516 	return 0;
1517 }
1518 
1519 /* Same routine used for post_reset and reset_resume */
hid_post_reset(struct usb_interface * intf)1520 static int hid_post_reset(struct usb_interface *intf)
1521 {
1522 	struct usb_device *dev = interface_to_usbdev (intf);
1523 	struct hid_device *hid = usb_get_intfdata(intf);
1524 	struct usbhid_device *usbhid = hid->driver_data;
1525 	struct usb_host_interface *interface = intf->cur_altsetting;
1526 	int status;
1527 	char *rdesc;
1528 
1529 	/* Fetch and examine the HID report descriptor. If this
1530 	 * has changed, then rebind. Since usbcore's check of the
1531 	 * configuration descriptors passed, we already know that
1532 	 * the size of the HID report descriptor has not changed.
1533 	 */
1534 	rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL);
1535 	if (!rdesc)
1536 		return -ENOMEM;
1537 
1538 	status = hid_get_class_descriptor(dev,
1539 				interface->desc.bInterfaceNumber,
1540 				HID_DT_REPORT, rdesc, hid->dev_rsize);
1541 	if (status < 0) {
1542 		dbg_hid("reading report descriptor failed (post_reset)\n");
1543 		kfree(rdesc);
1544 		return status;
1545 	}
1546 	status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize);
1547 	kfree(rdesc);
1548 	if (status != 0) {
1549 		dbg_hid("report descriptor changed\n");
1550 		return -EPERM;
1551 	}
1552 
1553 	/* No need to do another reset or clear a halted endpoint */
1554 	spin_lock_irq(&usbhid->lock);
1555 	clear_bit(HID_RESET_PENDING, &usbhid->iofl);
1556 	clear_bit(HID_CLEAR_HALT, &usbhid->iofl);
1557 	spin_unlock_irq(&usbhid->lock);
1558 	hid_set_idle(dev, intf->cur_altsetting->desc.bInterfaceNumber, 0, 0);
1559 
1560 	hid_restart_io(hid);
1561 
1562 	return 0;
1563 }
1564 
1565 #ifdef CONFIG_PM
hid_resume_common(struct hid_device * hid,bool driver_suspended)1566 static int hid_resume_common(struct hid_device *hid, bool driver_suspended)
1567 {
1568 	int status = 0;
1569 
1570 	hid_restart_io(hid);
1571 	if (driver_suspended)
1572 		status = hid_driver_resume(hid);
1573 	return status;
1574 }
1575 
hid_suspend(struct usb_interface * intf,pm_message_t message)1576 static int hid_suspend(struct usb_interface *intf, pm_message_t message)
1577 {
1578 	struct hid_device *hid = usb_get_intfdata(intf);
1579 	struct usbhid_device *usbhid = hid->driver_data;
1580 	int status = 0;
1581 	bool driver_suspended = false;
1582 	unsigned int ledcount;
1583 
1584 	if (PMSG_IS_AUTO(message)) {
1585 		ledcount = hidinput_count_leds(hid);
1586 		spin_lock_irq(&usbhid->lock);	/* Sync with error handler */
1587 		if (!test_bit(HID_RESET_PENDING, &usbhid->iofl)
1588 		    && !test_bit(HID_CLEAR_HALT, &usbhid->iofl)
1589 		    && !test_bit(HID_OUT_RUNNING, &usbhid->iofl)
1590 		    && !test_bit(HID_CTRL_RUNNING, &usbhid->iofl)
1591 		    && !test_bit(HID_KEYS_PRESSED, &usbhid->iofl)
1592 		    && (!ledcount || ignoreled))
1593 		{
1594 			set_bit(HID_SUSPENDED, &usbhid->iofl);
1595 			spin_unlock_irq(&usbhid->lock);
1596 			status = hid_driver_suspend(hid, message);
1597 			if (status < 0)
1598 				goto failed;
1599 			driver_suspended = true;
1600 		} else {
1601 			usbhid_mark_busy(usbhid);
1602 			spin_unlock_irq(&usbhid->lock);
1603 			return -EBUSY;
1604 		}
1605 
1606 	} else {
1607 		/* TODO: resume() might need to handle suspend failure */
1608 		status = hid_driver_suspend(hid, message);
1609 		driver_suspended = true;
1610 		spin_lock_irq(&usbhid->lock);
1611 		set_bit(HID_SUSPENDED, &usbhid->iofl);
1612 		spin_unlock_irq(&usbhid->lock);
1613 		if (usbhid_wait_io(hid) < 0)
1614 			status = -EIO;
1615 	}
1616 
1617 	hid_cancel_delayed_stuff(usbhid);
1618 	hid_cease_io(usbhid);
1619 
1620 	if (PMSG_IS_AUTO(message) && test_bit(HID_KEYS_PRESSED, &usbhid->iofl)) {
1621 		/* lost race against keypresses */
1622 		status = -EBUSY;
1623 		goto failed;
1624 	}
1625 	dev_dbg(&intf->dev, "suspend\n");
1626 	return status;
1627 
1628  failed:
1629 	hid_resume_common(hid, driver_suspended);
1630 	return status;
1631 }
1632 
hid_resume(struct usb_interface * intf)1633 static int hid_resume(struct usb_interface *intf)
1634 {
1635 	struct hid_device *hid = usb_get_intfdata (intf);
1636 	int status;
1637 
1638 	status = hid_resume_common(hid, true);
1639 	dev_dbg(&intf->dev, "resume status %d\n", status);
1640 	return 0;
1641 }
1642 
hid_reset_resume(struct usb_interface * intf)1643 static int hid_reset_resume(struct usb_interface *intf)
1644 {
1645 	struct hid_device *hid = usb_get_intfdata(intf);
1646 	int status;
1647 
1648 	status = hid_post_reset(intf);
1649 	if (status >= 0) {
1650 		int ret = hid_driver_reset_resume(hid);
1651 		if (ret < 0)
1652 			status = ret;
1653 	}
1654 	return status;
1655 }
1656 
1657 #endif /* CONFIG_PM */
1658 
1659 static const struct usb_device_id hid_usb_ids[] = {
1660 	{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
1661 		.bInterfaceClass = USB_INTERFACE_CLASS_HID },
1662 	{ }						/* Terminating entry */
1663 };
1664 
1665 MODULE_DEVICE_TABLE (usb, hid_usb_ids);
1666 
1667 static struct usb_driver hid_driver = {
1668 	.name =		"usbhid",
1669 	.probe =	usbhid_probe,
1670 	.disconnect =	usbhid_disconnect,
1671 #ifdef CONFIG_PM
1672 	.suspend =	hid_suspend,
1673 	.resume =	hid_resume,
1674 	.reset_resume =	hid_reset_resume,
1675 #endif
1676 	.pre_reset =	hid_pre_reset,
1677 	.post_reset =	hid_post_reset,
1678 	.id_table =	hid_usb_ids,
1679 	.supports_autosuspend = 1,
1680 };
1681 
usbhid_find_interface(int minor)1682 struct usb_interface *usbhid_find_interface(int minor)
1683 {
1684 	return usb_find_interface(&hid_driver, minor);
1685 }
1686 
hid_init(void)1687 static int __init hid_init(void)
1688 {
1689 	int retval;
1690 
1691 	retval = hid_quirks_init(quirks_param, BUS_USB, MAX_USBHID_BOOT_QUIRKS);
1692 	if (retval)
1693 		goto usbhid_quirks_init_fail;
1694 	retval = usb_register(&hid_driver);
1695 	if (retval)
1696 		goto usb_register_fail;
1697 	pr_info(KBUILD_MODNAME ": " DRIVER_DESC "\n");
1698 
1699 	return 0;
1700 usb_register_fail:
1701 	hid_quirks_exit(BUS_USB);
1702 usbhid_quirks_init_fail:
1703 	return retval;
1704 }
1705 
hid_exit(void)1706 static void __exit hid_exit(void)
1707 {
1708 	usb_deregister(&hid_driver);
1709 	hid_quirks_exit(BUS_USB);
1710 }
1711 
1712 module_init(hid_init);
1713 module_exit(hid_exit);
1714 
1715 MODULE_AUTHOR("Andreas Gal");
1716 MODULE_AUTHOR("Vojtech Pavlik");
1717 MODULE_AUTHOR("Jiri Kosina");
1718 MODULE_DESCRIPTION(DRIVER_DESC);
1719 MODULE_LICENSE("GPL");
1720