Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * User level driver support for input subsystem | |
3 | * | |
4 | * Heavily based on evdev.c by Vojtech Pavlik | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org> | |
21 | * | |
22 | * Changes/Revisions: | |
e3480a61 BT |
23 | * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>) |
24 | * - add UI_GET_SYSNAME ioctl | |
ff462551 AH |
25 | * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) |
26 | * - updated ff support for the changes in kernel interface | |
27 | * - added MODULE_VERSION | |
1da177e4 LT |
28 | * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) |
29 | * - added force feedback support | |
30 | * - added UI_SET_PHYS | |
31 | * 0.1 20/06/2002 | |
32 | * - first public version | |
33 | */ | |
a11bc476 | 34 | #include <uapi/linux/uinput.h> |
1da177e4 | 35 | #include <linux/poll.h> |
a99bbaf5 | 36 | #include <linux/sched.h> |
1da177e4 LT |
37 | #include <linux/slab.h> |
38 | #include <linux/module.h> | |
39 | #include <linux/init.h> | |
1da177e4 LT |
40 | #include <linux/fs.h> |
41 | #include <linux/miscdevice.h> | |
d77651a2 | 42 | #include <linux/overflow.h> |
47c78e89 | 43 | #include <linux/input/mt.h> |
2d56f3a3 | 44 | #include "../input-compat.h" |
1da177e4 | 45 | |
a11bc476 DT |
46 | #define UINPUT_NAME "uinput" |
47 | #define UINPUT_BUFFER_SIZE 16 | |
48 | #define UINPUT_NUM_REQUESTS 16 | |
49 | ||
50 | enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED }; | |
51 | ||
52 | struct uinput_request { | |
53 | unsigned int id; | |
54 | unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */ | |
55 | ||
56 | int retval; | |
57 | struct completion done; | |
58 | ||
59 | union { | |
60 | unsigned int effect_id; | |
61 | struct { | |
62 | struct ff_effect *effect; | |
63 | struct ff_effect *old; | |
64 | } upload; | |
65 | } u; | |
66 | }; | |
67 | ||
68 | struct uinput_device { | |
69 | struct input_dev *dev; | |
70 | struct mutex mutex; | |
71 | enum uinput_state state; | |
72 | wait_queue_head_t waitq; | |
73 | unsigned char ready; | |
74 | unsigned char head; | |
75 | unsigned char tail; | |
76 | struct input_event buff[UINPUT_BUFFER_SIZE]; | |
77 | unsigned int ff_effects_max; | |
78 | ||
79 | struct uinput_request *requests[UINPUT_NUM_REQUESTS]; | |
80 | wait_queue_head_t requests_waitq; | |
81 | spinlock_t requests_lock; | |
82 | }; | |
83 | ||
54ce165e DT |
84 | static int uinput_dev_event(struct input_dev *dev, |
85 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 86 | { |
373f9713 | 87 | struct uinput_device *udev = input_get_drvdata(dev); |
b3495cec | 88 | struct timespec64 ts; |
1da177e4 LT |
89 | |
90 | udev->buff[udev->head].type = type; | |
91 | udev->buff[udev->head].code = code; | |
92 | udev->buff[udev->head].value = value; | |
b3495cec | 93 | ktime_get_ts64(&ts); |
152194fe DD |
94 | udev->buff[udev->head].input_event_sec = ts.tv_sec; |
95 | udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC; | |
1da177e4 LT |
96 | udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; |
97 | ||
98 | wake_up_interruptible(&udev->waitq); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
05cebd38 | 103 | /* Atomically allocate an ID for the given request. Returns 0 on success. */ |
00ce756c DT |
104 | static bool uinput_request_alloc_id(struct uinput_device *udev, |
105 | struct uinput_request *request) | |
1da177e4 | 106 | { |
c5b3533a | 107 | unsigned int id; |
00ce756c | 108 | bool reserved = false; |
1da177e4 | 109 | |
0048e603 | 110 | spin_lock(&udev->requests_lock); |
152c12f5 | 111 | |
05cebd38 | 112 | for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { |
1da177e4 | 113 | if (!udev->requests[id]) { |
1da177e4 | 114 | request->id = id; |
0048e603 | 115 | udev->requests[id] = request; |
00ce756c | 116 | reserved = true; |
152c12f5 | 117 | break; |
1da177e4 | 118 | } |
05cebd38 | 119 | } |
152c12f5 | 120 | |
0048e603 | 121 | spin_unlock(&udev->requests_lock); |
00ce756c | 122 | return reserved; |
1da177e4 LT |
123 | } |
124 | ||
c5b3533a DT |
125 | static struct uinput_request *uinput_request_find(struct uinput_device *udev, |
126 | unsigned int id) | |
1da177e4 LT |
127 | { |
128 | /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ | |
c5b3533a | 129 | if (id >= UINPUT_NUM_REQUESTS) |
1da177e4 | 130 | return NULL; |
2d56f3a3 | 131 | |
1da177e4 LT |
132 | return udev->requests[id]; |
133 | } | |
134 | ||
00ce756c DT |
135 | static int uinput_request_reserve_slot(struct uinput_device *udev, |
136 | struct uinput_request *request) | |
1da177e4 | 137 | { |
0048e603 DT |
138 | /* Allocate slot. If none are available right away, wait. */ |
139 | return wait_event_interruptible(udev->requests_waitq, | |
00ce756c | 140 | uinput_request_alloc_id(udev, request)); |
0048e603 | 141 | } |
1da177e4 | 142 | |
6b4877c7 DT |
143 | static void uinput_request_release_slot(struct uinput_device *udev, |
144 | unsigned int id) | |
0048e603 | 145 | { |
0048e603 | 146 | /* Mark slot as available */ |
6b4877c7 DT |
147 | spin_lock(&udev->requests_lock); |
148 | udev->requests[id] = NULL; | |
149 | spin_unlock(&udev->requests_lock); | |
e7507ed9 | 150 | |
6b4877c7 | 151 | wake_up(&udev->requests_waitq); |
1da177e4 LT |
152 | } |
153 | ||
00ce756c DT |
154 | static int uinput_request_send(struct uinput_device *udev, |
155 | struct uinput_request *request) | |
1da177e4 | 156 | { |
05cebd38 ASRF |
157 | int retval; |
158 | ||
05cebd38 ASRF |
159 | retval = mutex_lock_interruptible(&udev->mutex); |
160 | if (retval) | |
161 | return retval; | |
162 | ||
163 | if (udev->state != UIST_CREATED) { | |
164 | retval = -ENODEV; | |
165 | goto out; | |
166 | } | |
167 | ||
00ce756c DT |
168 | init_completion(&request->done); |
169 | ||
170 | /* | |
171 | * Tell our userspace application about this new request | |
172 | * by queueing an input event. | |
173 | */ | |
05cebd38 ASRF |
174 | uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); |
175 | ||
176 | out: | |
177 | mutex_unlock(&udev->mutex); | |
178 | return retval; | |
179 | } | |
180 | ||
00ce756c DT |
181 | static int uinput_request_submit(struct uinput_device *udev, |
182 | struct uinput_request *request) | |
183 | { | |
6b4877c7 | 184 | int retval; |
00ce756c | 185 | |
6b4877c7 DT |
186 | retval = uinput_request_reserve_slot(udev, request); |
187 | if (retval) | |
188 | return retval; | |
00ce756c | 189 | |
6b4877c7 DT |
190 | retval = uinput_request_send(udev, request); |
191 | if (retval) | |
192 | goto out; | |
00ce756c | 193 | |
8e009118 DT |
194 | if (!wait_for_completion_timeout(&request->done, 30 * HZ)) { |
195 | retval = -ETIMEDOUT; | |
196 | goto out; | |
197 | } | |
198 | ||
6b4877c7 DT |
199 | retval = request->retval; |
200 | ||
201 | out: | |
202 | uinput_request_release_slot(udev, request->id); | |
203 | return retval; | |
00ce756c DT |
204 | } |
205 | ||
05cebd38 | 206 | /* |
54ce165e | 207 | * Fail all outstanding requests so handlers don't wait for the userspace |
05cebd38 ASRF |
208 | * to finish processing them. |
209 | */ | |
210 | static void uinput_flush_requests(struct uinput_device *udev) | |
211 | { | |
212 | struct uinput_request *request; | |
213 | int i; | |
1da177e4 | 214 | |
05cebd38 ASRF |
215 | spin_lock(&udev->requests_lock); |
216 | ||
217 | for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { | |
218 | request = udev->requests[i]; | |
219 | if (request) { | |
220 | request->retval = -ENODEV; | |
6b4877c7 | 221 | complete(&request->done); |
05cebd38 ASRF |
222 | } |
223 | } | |
224 | ||
225 | spin_unlock(&udev->requests_lock); | |
1da177e4 LT |
226 | } |
227 | ||
ff462551 AH |
228 | static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) |
229 | { | |
230 | uinput_dev_event(dev, EV_FF, FF_GAIN, gain); | |
231 | } | |
232 | ||
233 | static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) | |
234 | { | |
235 | uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); | |
236 | } | |
237 | ||
238 | static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) | |
239 | { | |
240 | return uinput_dev_event(dev, EV_FF, effect_id, value); | |
241 | } | |
242 | ||
54ce165e DT |
243 | static int uinput_dev_upload_effect(struct input_dev *dev, |
244 | struct ff_effect *effect, | |
245 | struct ff_effect *old) | |
1da177e4 | 246 | { |
05cebd38 | 247 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 LT |
248 | struct uinput_request request; |
249 | ||
2d56f3a3 PL |
250 | /* |
251 | * uinput driver does not currently support periodic effects with | |
252 | * custom waveform since it does not have a way to pass buffer of | |
253 | * samples (custom_data) to userspace. If ever there is a device | |
254 | * supporting custom waveforms we would need to define an additional | |
255 | * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. | |
256 | */ | |
257 | if (effect->type == FF_PERIODIC && | |
258 | effect->u.periodic.waveform == FF_CUSTOM) | |
259 | return -EINVAL; | |
260 | ||
0048e603 | 261 | request.code = UI_FF_UPLOAD; |
ff462551 AH |
262 | request.u.upload.effect = effect; |
263 | request.u.upload.old = old; | |
0048e603 | 264 | |
00ce756c | 265 | return uinput_request_submit(udev, &request); |
1da177e4 LT |
266 | } |
267 | ||
268 | static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) | |
269 | { | |
05cebd38 | 270 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 LT |
271 | struct uinput_request request; |
272 | ||
273 | if (!test_bit(EV_FF, dev->evbit)) | |
274 | return -ENOSYS; | |
275 | ||
0048e603 | 276 | request.code = UI_FF_ERASE; |
1da177e4 | 277 | request.u.effect_id = effect_id; |
0048e603 | 278 | |
00ce756c | 279 | return uinput_request_submit(udev, &request); |
1da177e4 LT |
280 | } |
281 | ||
e8b95728 DT |
282 | static int uinput_dev_flush(struct input_dev *dev, struct file *file) |
283 | { | |
284 | /* | |
285 | * If we are called with file == NULL that means we are tearing | |
286 | * down the device, and therefore we can not handle FF erase | |
287 | * requests: either we are handling UI_DEV_DESTROY (and holding | |
288 | * the udev->mutex), or the file descriptor is closed and there is | |
289 | * nobody on the other side anymore. | |
290 | */ | |
291 | return file ? input_ff_flush(dev, file) : 0; | |
292 | } | |
293 | ||
29506415 | 294 | static void uinput_destroy_device(struct uinput_device *udev) |
1da177e4 | 295 | { |
29506415 | 296 | const char *name, *phys; |
05cebd38 ASRF |
297 | struct input_dev *dev = udev->dev; |
298 | enum uinput_state old_state = udev->state; | |
299 | ||
300 | udev->state = UIST_NEW_DEVICE; | |
29506415 | 301 | |
05cebd38 ASRF |
302 | if (dev) { |
303 | name = dev->name; | |
304 | phys = dev->phys; | |
305 | if (old_state == UIST_CREATED) { | |
306 | uinput_flush_requests(udev); | |
307 | input_unregister_device(dev); | |
308 | } else { | |
309 | input_free_device(dev); | |
310 | } | |
29506415 DT |
311 | kfree(name); |
312 | kfree(phys); | |
313 | udev->dev = NULL; | |
1da177e4 | 314 | } |
1da177e4 LT |
315 | } |
316 | ||
29506415 | 317 | static int uinput_create_device(struct uinput_device *udev) |
1da177e4 | 318 | { |
ff462551 | 319 | struct input_dev *dev = udev->dev; |
fbae10db | 320 | int error, nslot; |
29506415 DT |
321 | |
322 | if (udev->state != UIST_SETUP_COMPLETE) { | |
323 | printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); | |
1da177e4 LT |
324 | return -EINVAL; |
325 | } | |
326 | ||
601bbbe0 DT |
327 | if (test_bit(EV_ABS, dev->evbit)) { |
328 | input_alloc_absinfo(dev); | |
329 | if (!dev->absinfo) { | |
330 | error = -EINVAL; | |
fbae10db | 331 | goto fail1; |
601bbbe0 DT |
332 | } |
333 | ||
334 | if (test_bit(ABS_MT_SLOT, dev->absbit)) { | |
335 | nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; | |
336 | error = input_mt_init_slots(dev, nslot, 0); | |
337 | if (error) | |
338 | goto fail1; | |
339 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { | |
340 | input_set_events_per_packet(dev, 60); | |
341 | } | |
fbae10db DH |
342 | } |
343 | ||
daf6cd0c EV |
344 | if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) { |
345 | printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n", | |
346 | UINPUT_NAME); | |
347 | error = -EINVAL; | |
348 | goto fail1; | |
349 | } | |
350 | ||
ff462551 AH |
351 | if (udev->ff_effects_max) { |
352 | error = input_ff_create(dev, udev->ff_effects_max); | |
353 | if (error) | |
354 | goto fail1; | |
355 | ||
356 | dev->ff->upload = uinput_dev_upload_effect; | |
357 | dev->ff->erase = uinput_dev_erase_effect; | |
358 | dev->ff->playback = uinput_dev_playback; | |
359 | dev->ff->set_gain = uinput_dev_set_gain; | |
360 | dev->ff->set_autocenter = uinput_dev_set_autocenter; | |
e8b95728 DT |
361 | /* |
362 | * The standard input_ff_flush() implementation does | |
363 | * not quite work for uinput as we can't reasonably | |
364 | * handle FF requests during device teardown. | |
365 | */ | |
366 | dev->flush = uinput_dev_flush; | |
29506415 | 367 | } |
1da177e4 | 368 | |
04ce40a6 DT |
369 | dev->event = uinput_dev_event; |
370 | ||
371 | input_set_drvdata(udev->dev, udev); | |
372 | ||
ff462551 AH |
373 | error = input_register_device(udev->dev); |
374 | if (error) | |
375 | goto fail2; | |
376 | ||
29506415 | 377 | udev->state = UIST_CREATED; |
1da177e4 LT |
378 | |
379 | return 0; | |
ff462551 AH |
380 | |
381 | fail2: input_ff_destroy(dev); | |
382 | fail1: uinput_destroy_device(udev); | |
383 | return error; | |
1da177e4 LT |
384 | } |
385 | ||
386 | static int uinput_open(struct inode *inode, struct file *file) | |
387 | { | |
29506415 | 388 | struct uinput_device *newdev; |
1da177e4 | 389 | |
29506415 | 390 | newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); |
1da177e4 | 391 | if (!newdev) |
29506415 DT |
392 | return -ENOMEM; |
393 | ||
221979aa | 394 | mutex_init(&newdev->mutex); |
0048e603 | 395 | spin_lock_init(&newdev->requests_lock); |
1da177e4 | 396 | init_waitqueue_head(&newdev->requests_waitq); |
29506415 DT |
397 | init_waitqueue_head(&newdev->waitq); |
398 | newdev->state = UIST_NEW_DEVICE; | |
1da177e4 LT |
399 | |
400 | file->private_data = newdev; | |
c5bf68fe | 401 | stream_open(inode, file); |
1da177e4 LT |
402 | |
403 | return 0; | |
1da177e4 LT |
404 | } |
405 | ||
fbae10db DH |
406 | static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code, |
407 | const struct input_absinfo *abs) | |
408 | { | |
d77651a2 | 409 | int min, max, range; |
fbae10db DH |
410 | |
411 | min = abs->minimum; | |
412 | max = abs->maximum; | |
413 | ||
4fef1250 | 414 | if ((min != 0 || max != 0) && max < min) { |
fbae10db DH |
415 | printk(KERN_DEBUG |
416 | "%s: invalid abs[%02x] min:%d max:%d\n", | |
417 | UINPUT_NAME, code, min, max); | |
418 | return -EINVAL; | |
419 | } | |
420 | ||
d77651a2 | 421 | if (!check_sub_overflow(max, min, &range) && abs->flat > range) { |
fbae10db DH |
422 | printk(KERN_DEBUG |
423 | "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n", | |
424 | UINPUT_NAME, code, abs->flat, min, max); | |
425 | return -EINVAL; | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | static int uinput_validate_absbits(struct input_dev *dev) |
432 | { | |
433 | unsigned int cnt; | |
fbae10db | 434 | int error; |
bcb898e5 DH |
435 | |
436 | if (!test_bit(EV_ABS, dev->evbit)) | |
437 | return 0; | |
438 | ||
439 | /* | |
440 | * Check if absmin/absmax/absfuzz/absflat are sane. | |
441 | */ | |
1da177e4 | 442 | |
b6d30968 | 443 | for_each_set_bit(cnt, dev->absbit, ABS_CNT) { |
fbae10db | 444 | if (!dev->absinfo) |
bcb898e5 | 445 | return -EINVAL; |
bcb898e5 | 446 | |
fbae10db DH |
447 | error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]); |
448 | if (error) | |
449 | return error; | |
bcb898e5 DH |
450 | } |
451 | ||
452 | return 0; | |
1da177e4 LT |
453 | } |
454 | ||
052876f8 BT |
455 | static int uinput_dev_setup(struct uinput_device *udev, |
456 | struct uinput_setup __user *arg) | |
457 | { | |
458 | struct uinput_setup setup; | |
459 | struct input_dev *dev; | |
052876f8 BT |
460 | |
461 | if (udev->state == UIST_CREATED) | |
462 | return -EINVAL; | |
463 | ||
464 | if (copy_from_user(&setup, arg, sizeof(setup))) | |
465 | return -EFAULT; | |
466 | ||
467 | if (!setup.name[0]) | |
468 | return -EINVAL; | |
469 | ||
470 | dev = udev->dev; | |
471 | dev->id = setup.id; | |
472 | udev->ff_effects_max = setup.ff_effects_max; | |
473 | ||
474 | kfree(dev->name); | |
475 | dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL); | |
476 | if (!dev->name) | |
477 | return -ENOMEM; | |
478 | ||
052876f8 BT |
479 | udev->state = UIST_SETUP_COMPLETE; |
480 | return 0; | |
481 | } | |
482 | ||
483 | static int uinput_abs_setup(struct uinput_device *udev, | |
484 | struct uinput_setup __user *arg, size_t size) | |
485 | { | |
486 | struct uinput_abs_setup setup = {}; | |
487 | struct input_dev *dev; | |
fbae10db | 488 | int error; |
052876f8 BT |
489 | |
490 | if (size > sizeof(setup)) | |
491 | return -E2BIG; | |
492 | ||
493 | if (udev->state == UIST_CREATED) | |
494 | return -EINVAL; | |
495 | ||
496 | if (copy_from_user(&setup, arg, size)) | |
497 | return -EFAULT; | |
498 | ||
499 | if (setup.code > ABS_MAX) | |
500 | return -ERANGE; | |
501 | ||
502 | dev = udev->dev; | |
503 | ||
fbae10db DH |
504 | error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo); |
505 | if (error) | |
506 | return error; | |
507 | ||
052876f8 BT |
508 | input_alloc_absinfo(dev); |
509 | if (!dev->absinfo) | |
510 | return -ENOMEM; | |
511 | ||
512 | set_bit(setup.code, dev->absbit); | |
513 | dev->absinfo[setup.code] = setup.absinfo; | |
052876f8 BT |
514 | return 0; |
515 | } | |
516 | ||
517 | /* legacy setup via write() */ | |
518 | static int uinput_setup_device_legacy(struct uinput_device *udev, | |
519 | const char __user *buffer, size_t count) | |
1da177e4 LT |
520 | { |
521 | struct uinput_user_dev *user_dev; | |
522 | struct input_dev *dev; | |
5d9d6e91 | 523 | int i; |
152c12f5 | 524 | int retval; |
1da177e4 | 525 | |
29506415 DT |
526 | if (count != sizeof(struct uinput_user_dev)) |
527 | return -EINVAL; | |
528 | ||
529 | if (!udev->dev) { | |
04ce40a6 DT |
530 | udev->dev = input_allocate_device(); |
531 | if (!udev->dev) | |
532 | return -ENOMEM; | |
29506415 | 533 | } |
1da177e4 | 534 | |
1da177e4 LT |
535 | dev = udev->dev; |
536 | ||
4dfcc271 | 537 | user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); |
163d2770 | 538 | if (IS_ERR(user_dev)) |
4dfcc271 | 539 | return PTR_ERR(user_dev); |
1da177e4 | 540 | |
ff462551 AH |
541 | udev->ff_effects_max = user_dev->ff_effects_max; |
542 | ||
5d9d6e91 DH |
543 | /* Ensure name is filled in */ |
544 | if (!user_dev->name[0]) { | |
29506415 DT |
545 | retval = -EINVAL; |
546 | goto exit; | |
547 | } | |
548 | ||
549 | kfree(dev->name); | |
5d9d6e91 DH |
550 | dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, |
551 | GFP_KERNEL); | |
552 | if (!dev->name) { | |
1da177e4 LT |
553 | retval = -ENOMEM; |
554 | goto exit; | |
555 | } | |
556 | ||
1da177e4 LT |
557 | dev->id.bustype = user_dev->id.bustype; |
558 | dev->id.vendor = user_dev->id.vendor; | |
559 | dev->id.product = user_dev->id.product; | |
560 | dev->id.version = user_dev->id.version; | |
1da177e4 | 561 | |
72d47362 | 562 | for (i = 0; i < ABS_CNT; i++) { |
987a6c02 DM |
563 | input_abs_set_max(dev, i, user_dev->absmax[i]); |
564 | input_abs_set_min(dev, i, user_dev->absmin[i]); | |
565 | input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); | |
566 | input_abs_set_flat(dev, i, user_dev->absflat[i]); | |
567 | } | |
1da177e4 | 568 | |
bcb898e5 DH |
569 | retval = uinput_validate_absbits(dev); |
570 | if (retval < 0) | |
571 | goto exit; | |
1da177e4 | 572 | |
29506415 DT |
573 | udev->state = UIST_SETUP_COMPLETE; |
574 | retval = count; | |
575 | ||
576 | exit: | |
1da177e4 LT |
577 | kfree(user_dev); |
578 | return retval; | |
579 | } | |
580 | ||
cbf05413 RM |
581 | static ssize_t uinput_inject_events(struct uinput_device *udev, |
582 | const char __user *buffer, size_t count) | |
29506415 DT |
583 | { |
584 | struct input_event ev; | |
cbf05413 | 585 | size_t bytes = 0; |
29506415 | 586 | |
cbf05413 | 587 | if (count != 0 && count < input_event_size()) |
29506415 DT |
588 | return -EINVAL; |
589 | ||
cbf05413 RM |
590 | while (bytes + input_event_size() <= count) { |
591 | /* | |
592 | * Note that even if some events were fetched successfully | |
593 | * we are still going to return EFAULT instead of partial | |
594 | * count to let userspace know that it got it's buffers | |
595 | * all wrong. | |
596 | */ | |
597 | if (input_event_from_user(buffer + bytes, &ev)) | |
598 | return -EFAULT; | |
29506415 | 599 | |
cbf05413 RM |
600 | input_event(udev->dev, ev.type, ev.code, ev.value); |
601 | bytes += input_event_size(); | |
cecf1070 | 602 | cond_resched(); |
cbf05413 | 603 | } |
29506415 | 604 | |
cbf05413 | 605 | return bytes; |
29506415 DT |
606 | } |
607 | ||
54ce165e DT |
608 | static ssize_t uinput_write(struct file *file, const char __user *buffer, |
609 | size_t count, loff_t *ppos) | |
1da177e4 LT |
610 | { |
611 | struct uinput_device *udev = file->private_data; | |
29506415 | 612 | int retval; |
1da177e4 | 613 | |
22ae19c6 DT |
614 | if (count == 0) |
615 | return 0; | |
616 | ||
221979aa | 617 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
618 | if (retval) |
619 | return retval; | |
620 | ||
621 | retval = udev->state == UIST_CREATED ? | |
cbf05413 | 622 | uinput_inject_events(udev, buffer, count) : |
052876f8 | 623 | uinput_setup_device_legacy(udev, buffer, count); |
1da177e4 | 624 | |
221979aa | 625 | mutex_unlock(&udev->mutex); |
1da177e4 | 626 | |
29506415 | 627 | return retval; |
1da177e4 LT |
628 | } |
629 | ||
929d1af5 DT |
630 | static bool uinput_fetch_next_event(struct uinput_device *udev, |
631 | struct input_event *event) | |
632 | { | |
633 | bool have_event; | |
634 | ||
635 | spin_lock_irq(&udev->dev->event_lock); | |
636 | ||
637 | have_event = udev->head != udev->tail; | |
638 | if (have_event) { | |
639 | *event = udev->buff[udev->tail]; | |
640 | udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; | |
641 | } | |
642 | ||
643 | spin_unlock_irq(&udev->dev->event_lock); | |
644 | ||
645 | return have_event; | |
646 | } | |
647 | ||
22ae19c6 DT |
648 | static ssize_t uinput_events_to_user(struct uinput_device *udev, |
649 | char __user *buffer, size_t count) | |
1da177e4 | 650 | { |
929d1af5 | 651 | struct input_event event; |
22ae19c6 | 652 | size_t read = 0; |
1da177e4 | 653 | |
22ae19c6 DT |
654 | while (read + input_event_size() <= count && |
655 | uinput_fetch_next_event(udev, &event)) { | |
f40033ac | 656 | |
00ce756c DT |
657 | if (input_event_to_user(buffer + read, &event)) |
658 | return -EFAULT; | |
1da177e4 | 659 | |
22ae19c6 DT |
660 | read += input_event_size(); |
661 | } | |
1da177e4 | 662 | |
00ce756c | 663 | return read; |
22ae19c6 | 664 | } |
1da177e4 | 665 | |
22ae19c6 DT |
666 | static ssize_t uinput_read(struct file *file, char __user *buffer, |
667 | size_t count, loff_t *ppos) | |
668 | { | |
669 | struct uinput_device *udev = file->private_data; | |
670 | ssize_t retval; | |
29506415 | 671 | |
22ae19c6 DT |
672 | if (count != 0 && count < input_event_size()) |
673 | return -EINVAL; | |
1da177e4 | 674 | |
22ae19c6 DT |
675 | do { |
676 | retval = mutex_lock_interruptible(&udev->mutex); | |
677 | if (retval) | |
678 | return retval; | |
929d1af5 | 679 | |
22ae19c6 DT |
680 | if (udev->state != UIST_CREATED) |
681 | retval = -ENODEV; | |
682 | else if (udev->head == udev->tail && | |
683 | (file->f_flags & O_NONBLOCK)) | |
684 | retval = -EAGAIN; | |
685 | else | |
686 | retval = uinput_events_to_user(udev, buffer, count); | |
929d1af5 | 687 | |
22ae19c6 | 688 | mutex_unlock(&udev->mutex); |
1da177e4 | 689 | |
22ae19c6 DT |
690 | if (retval || count == 0) |
691 | break; | |
692 | ||
693 | if (!(file->f_flags & O_NONBLOCK)) | |
694 | retval = wait_event_interruptible(udev->waitq, | |
695 | udev->head != udev->tail || | |
696 | udev->state != UIST_CREATED); | |
697 | } while (retval == 0); | |
29506415 | 698 | |
1da177e4 LT |
699 | return retval; |
700 | } | |
701 | ||
afc9a42b | 702 | static __poll_t uinput_poll(struct file *file, poll_table *wait) |
1da177e4 LT |
703 | { |
704 | struct uinput_device *udev = file->private_data; | |
705 | ||
706 | poll_wait(file, &udev->waitq, wait); | |
707 | ||
708 | if (udev->head != udev->tail) | |
a9a08845 | 709 | return EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
710 | |
711 | return 0; | |
712 | } | |
713 | ||
29506415 | 714 | static int uinput_release(struct inode *inode, struct file *file) |
1da177e4 | 715 | { |
29506415 | 716 | struct uinput_device *udev = file->private_data; |
1da177e4 | 717 | |
29506415 | 718 | uinput_destroy_device(udev); |
1da177e4 LT |
719 | kfree(udev); |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
2d56f3a3 PL |
724 | #ifdef CONFIG_COMPAT |
725 | struct uinput_ff_upload_compat { | |
c5b3533a DT |
726 | __u32 request_id; |
727 | __s32 retval; | |
2d56f3a3 PL |
728 | struct ff_effect_compat effect; |
729 | struct ff_effect_compat old; | |
730 | }; | |
731 | ||
732 | static int uinput_ff_upload_to_user(char __user *buffer, | |
733 | const struct uinput_ff_upload *ff_up) | |
734 | { | |
b8b4ead1 | 735 | if (in_compat_syscall()) { |
2d56f3a3 PL |
736 | struct uinput_ff_upload_compat ff_up_compat; |
737 | ||
738 | ff_up_compat.request_id = ff_up->request_id; | |
739 | ff_up_compat.retval = ff_up->retval; | |
740 | /* | |
741 | * It so happens that the pointer that gives us the trouble | |
742 | * is the last field in the structure. Since we don't support | |
743 | * custom waveforms in uinput anyway we can just copy the whole | |
744 | * thing (to the compat size) and ignore the pointer. | |
745 | */ | |
746 | memcpy(&ff_up_compat.effect, &ff_up->effect, | |
747 | sizeof(struct ff_effect_compat)); | |
748 | memcpy(&ff_up_compat.old, &ff_up->old, | |
749 | sizeof(struct ff_effect_compat)); | |
750 | ||
751 | if (copy_to_user(buffer, &ff_up_compat, | |
752 | sizeof(struct uinput_ff_upload_compat))) | |
753 | return -EFAULT; | |
754 | } else { | |
755 | if (copy_to_user(buffer, ff_up, | |
756 | sizeof(struct uinput_ff_upload))) | |
757 | return -EFAULT; | |
758 | } | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
764 | struct uinput_ff_upload *ff_up) | |
765 | { | |
b8b4ead1 | 766 | if (in_compat_syscall()) { |
2d56f3a3 PL |
767 | struct uinput_ff_upload_compat ff_up_compat; |
768 | ||
769 | if (copy_from_user(&ff_up_compat, buffer, | |
770 | sizeof(struct uinput_ff_upload_compat))) | |
771 | return -EFAULT; | |
772 | ||
773 | ff_up->request_id = ff_up_compat.request_id; | |
774 | ff_up->retval = ff_up_compat.retval; | |
775 | memcpy(&ff_up->effect, &ff_up_compat.effect, | |
776 | sizeof(struct ff_effect_compat)); | |
777 | memcpy(&ff_up->old, &ff_up_compat.old, | |
778 | sizeof(struct ff_effect_compat)); | |
779 | ||
780 | } else { | |
781 | if (copy_from_user(ff_up, buffer, | |
782 | sizeof(struct uinput_ff_upload))) | |
783 | return -EFAULT; | |
784 | } | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | #else | |
790 | ||
791 | static int uinput_ff_upload_to_user(char __user *buffer, | |
792 | const struct uinput_ff_upload *ff_up) | |
793 | { | |
794 | if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) | |
795 | return -EFAULT; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
801 | struct uinput_ff_upload *ff_up) | |
802 | { | |
803 | if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) | |
804 | return -EFAULT; | |
805 | ||
806 | return 0; | |
807 | } | |
808 | ||
809 | #endif | |
810 | ||
29506415 DT |
811 | #define uinput_set_bit(_arg, _bit, _max) \ |
812 | ({ \ | |
813 | int __ret = 0; \ | |
814 | if (udev->state == UIST_CREATED) \ | |
815 | __ret = -EINVAL; \ | |
816 | else if ((_arg) > (_max)) \ | |
817 | __ret = -EINVAL; \ | |
818 | else set_bit((_arg), udev->dev->_bit); \ | |
819 | __ret; \ | |
820 | }) | |
821 | ||
e3480a61 BT |
822 | static int uinput_str_to_user(void __user *dest, const char *str, |
823 | unsigned int maxlen) | |
824 | { | |
825 | char __user *p = dest; | |
826 | int len, ret; | |
827 | ||
828 | if (!str) | |
829 | return -ENOENT; | |
830 | ||
831 | if (maxlen == 0) | |
832 | return -EINVAL; | |
833 | ||
834 | len = strlen(str) + 1; | |
835 | if (len > maxlen) | |
836 | len = maxlen; | |
837 | ||
838 | ret = copy_to_user(p, str, len); | |
839 | if (ret) | |
840 | return -EFAULT; | |
841 | ||
842 | /* force terminating '\0' */ | |
843 | ret = put_user(0, p + len - 1); | |
844 | return ret ? -EFAULT : len; | |
845 | } | |
846 | ||
2d56f3a3 PL |
847 | static long uinput_ioctl_handler(struct file *file, unsigned int cmd, |
848 | unsigned long arg, void __user *p) | |
1da177e4 | 849 | { |
29506415 | 850 | int retval; |
2d56f3a3 | 851 | struct uinput_device *udev = file->private_data; |
1da177e4 LT |
852 | struct uinput_ff_upload ff_up; |
853 | struct uinput_ff_erase ff_erase; | |
854 | struct uinput_request *req; | |
5b6271bd | 855 | char *phys; |
e3480a61 BT |
856 | const char *name; |
857 | unsigned int size; | |
1da177e4 | 858 | |
221979aa | 859 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
860 | if (retval) |
861 | return retval; | |
862 | ||
863 | if (!udev->dev) { | |
04ce40a6 | 864 | udev->dev = input_allocate_device(); |
781f2dd0 DC |
865 | if (!udev->dev) { |
866 | retval = -ENOMEM; | |
867 | goto out; | |
868 | } | |
1da177e4 LT |
869 | } |
870 | ||
871 | switch (cmd) { | |
c0661652 DT |
872 | case UI_GET_VERSION: |
873 | if (put_user(UINPUT_VERSION, (unsigned int __user *)p)) | |
874 | retval = -EFAULT; | |
875 | goto out; | |
ba4e9a61 | 876 | |
c0661652 DT |
877 | case UI_DEV_CREATE: |
878 | retval = uinput_create_device(udev); | |
879 | goto out; | |
1da177e4 | 880 | |
c0661652 DT |
881 | case UI_DEV_DESTROY: |
882 | uinput_destroy_device(udev); | |
883 | goto out; | |
1da177e4 | 884 | |
c0661652 DT |
885 | case UI_DEV_SETUP: |
886 | retval = uinput_dev_setup(udev, p); | |
887 | goto out; | |
052876f8 | 888 | |
c0661652 | 889 | /* UI_ABS_SETUP is handled in the variable size ioctls */ |
052876f8 | 890 | |
c0661652 DT |
891 | case UI_SET_EVBIT: |
892 | retval = uinput_set_bit(arg, evbit, EV_MAX); | |
893 | goto out; | |
1da177e4 | 894 | |
c0661652 DT |
895 | case UI_SET_KEYBIT: |
896 | retval = uinput_set_bit(arg, keybit, KEY_MAX); | |
897 | goto out; | |
1da177e4 | 898 | |
c0661652 DT |
899 | case UI_SET_RELBIT: |
900 | retval = uinput_set_bit(arg, relbit, REL_MAX); | |
901 | goto out; | |
1da177e4 | 902 | |
c0661652 DT |
903 | case UI_SET_ABSBIT: |
904 | retval = uinput_set_bit(arg, absbit, ABS_MAX); | |
905 | goto out; | |
1da177e4 | 906 | |
c0661652 DT |
907 | case UI_SET_MSCBIT: |
908 | retval = uinput_set_bit(arg, mscbit, MSC_MAX); | |
909 | goto out; | |
1da177e4 | 910 | |
c0661652 DT |
911 | case UI_SET_LEDBIT: |
912 | retval = uinput_set_bit(arg, ledbit, LED_MAX); | |
913 | goto out; | |
914 | ||
915 | case UI_SET_SNDBIT: | |
916 | retval = uinput_set_bit(arg, sndbit, SND_MAX); | |
917 | goto out; | |
918 | ||
919 | case UI_SET_FFBIT: | |
920 | retval = uinput_set_bit(arg, ffbit, FF_MAX); | |
921 | goto out; | |
922 | ||
923 | case UI_SET_SWBIT: | |
924 | retval = uinput_set_bit(arg, swbit, SW_MAX); | |
925 | goto out; | |
926 | ||
927 | case UI_SET_PROPBIT: | |
928 | retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); | |
929 | goto out; | |
1da177e4 | 930 | |
c0661652 DT |
931 | case UI_SET_PHYS: |
932 | if (udev->state == UIST_CREATED) { | |
933 | retval = -EINVAL; | |
9d51e801 | 934 | goto out; |
c0661652 | 935 | } |
1da177e4 | 936 | |
c0661652 DT |
937 | phys = strndup_user(p, 1024); |
938 | if (IS_ERR(phys)) { | |
939 | retval = PTR_ERR(phys); | |
9d51e801 | 940 | goto out; |
c0661652 DT |
941 | } |
942 | ||
943 | kfree(udev->dev->phys); | |
944 | udev->dev->phys = phys; | |
945 | goto out; | |
1da177e4 | 946 | |
c0661652 DT |
947 | case UI_BEGIN_FF_UPLOAD: |
948 | retval = uinput_ff_upload_from_user(p, &ff_up); | |
949 | if (retval) | |
9d51e801 | 950 | goto out; |
59c7c037 | 951 | |
c0661652 DT |
952 | req = uinput_request_find(udev, ff_up.request_id); |
953 | if (!req || req->code != UI_FF_UPLOAD || | |
954 | !req->u.upload.effect) { | |
955 | retval = -EINVAL; | |
9d51e801 | 956 | goto out; |
c0661652 | 957 | } |
85b77200 | 958 | |
c0661652 DT |
959 | ff_up.retval = 0; |
960 | ff_up.effect = *req->u.upload.effect; | |
961 | if (req->u.upload.old) | |
962 | ff_up.old = *req->u.upload.old; | |
963 | else | |
964 | memset(&ff_up.old, 0, sizeof(struct ff_effect)); | |
4dfcc271 | 965 | |
c0661652 DT |
966 | retval = uinput_ff_upload_to_user(p, &ff_up); |
967 | goto out; | |
4dfcc271 | 968 | |
c0661652 DT |
969 | case UI_BEGIN_FF_ERASE: |
970 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
971 | retval = -EFAULT; | |
9d51e801 | 972 | goto out; |
c0661652 | 973 | } |
1da177e4 | 974 | |
c0661652 DT |
975 | req = uinput_request_find(udev, ff_erase.request_id); |
976 | if (!req || req->code != UI_FF_ERASE) { | |
977 | retval = -EINVAL; | |
9d51e801 | 978 | goto out; |
c0661652 | 979 | } |
1da177e4 | 980 | |
c0661652 DT |
981 | ff_erase.retval = 0; |
982 | ff_erase.effect_id = req->u.effect_id; | |
983 | if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { | |
984 | retval = -EFAULT; | |
9d51e801 | 985 | goto out; |
c0661652 | 986 | } |
1da177e4 | 987 | |
c0661652 | 988 | goto out; |
2d56f3a3 | 989 | |
c0661652 DT |
990 | case UI_END_FF_UPLOAD: |
991 | retval = uinput_ff_upload_from_user(p, &ff_up); | |
992 | if (retval) | |
993 | goto out; | |
2d56f3a3 | 994 | |
c0661652 DT |
995 | req = uinput_request_find(udev, ff_up.request_id); |
996 | if (!req || req->code != UI_FF_UPLOAD || | |
997 | !req->u.upload.effect) { | |
998 | retval = -EINVAL; | |
9d51e801 | 999 | goto out; |
c0661652 | 1000 | } |
1da177e4 | 1001 | |
c0661652 DT |
1002 | req->retval = ff_up.retval; |
1003 | complete(&req->done); | |
1004 | goto out; | |
2d56f3a3 | 1005 | |
c0661652 DT |
1006 | case UI_END_FF_ERASE: |
1007 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
1008 | retval = -EFAULT; | |
1009 | goto out; | |
1010 | } | |
2d56f3a3 | 1011 | |
c0661652 DT |
1012 | req = uinput_request_find(udev, ff_erase.request_id); |
1013 | if (!req || req->code != UI_FF_ERASE) { | |
1014 | retval = -EINVAL; | |
9d51e801 | 1015 | goto out; |
c0661652 DT |
1016 | } |
1017 | ||
1018 | req->retval = ff_erase.retval; | |
1019 | complete(&req->done); | |
1020 | goto out; | |
1da177e4 | 1021 | } |
29506415 | 1022 | |
e3480a61 BT |
1023 | size = _IOC_SIZE(cmd); |
1024 | ||
1025 | /* Now check variable-length commands */ | |
1026 | switch (cmd & ~IOCSIZE_MASK) { | |
1027 | case UI_GET_SYSNAME(0): | |
1028 | if (udev->state != UIST_CREATED) { | |
1029 | retval = -ENOENT; | |
1030 | goto out; | |
1031 | } | |
1032 | name = dev_name(&udev->dev->dev); | |
1033 | retval = uinput_str_to_user(p, name, size); | |
1034 | goto out; | |
052876f8 BT |
1035 | |
1036 | case UI_ABS_SETUP & ~IOCSIZE_MASK: | |
1037 | retval = uinput_abs_setup(udev, p, size); | |
1038 | goto out; | |
e3480a61 BT |
1039 | } |
1040 | ||
9d51e801 | 1041 | retval = -EINVAL; |
29506415 | 1042 | out: |
221979aa | 1043 | mutex_unlock(&udev->mutex); |
1da177e4 LT |
1044 | return retval; |
1045 | } | |
1046 | ||
2d56f3a3 PL |
1047 | static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1048 | { | |
1049 | return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); | |
1050 | } | |
1051 | ||
1052 | #ifdef CONFIG_COMPAT | |
affa80bd RL |
1053 | |
1054 | #define UI_SET_PHYS_COMPAT _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t) | |
1055 | ||
54ce165e DT |
1056 | static long uinput_compat_ioctl(struct file *file, |
1057 | unsigned int cmd, unsigned long arg) | |
2d56f3a3 | 1058 | { |
affa80bd RL |
1059 | if (cmd == UI_SET_PHYS_COMPAT) |
1060 | cmd = UI_SET_PHYS; | |
1061 | ||
2d56f3a3 PL |
1062 | return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); |
1063 | } | |
1064 | #endif | |
1065 | ||
2b8693c0 | 1066 | static const struct file_operations uinput_fops = { |
29506415 DT |
1067 | .owner = THIS_MODULE, |
1068 | .open = uinput_open, | |
1069 | .release = uinput_release, | |
1070 | .read = uinput_read, | |
1071 | .write = uinput_write, | |
1072 | .poll = uinput_poll, | |
1073 | .unlocked_ioctl = uinput_ioctl, | |
2d56f3a3 PL |
1074 | #ifdef CONFIG_COMPAT |
1075 | .compat_ioctl = uinput_compat_ioctl, | |
1076 | #endif | |
6038f373 | 1077 | .llseek = no_llseek, |
1da177e4 LT |
1078 | }; |
1079 | ||
1080 | static struct miscdevice uinput_misc = { | |
29506415 DT |
1081 | .fops = &uinput_fops, |
1082 | .minor = UINPUT_MINOR, | |
1083 | .name = UINPUT_NAME, | |
1da177e4 | 1084 | }; |
ca75d601 PM |
1085 | module_misc_device(uinput_misc); |
1086 | ||
8905aaaf KS |
1087 | MODULE_ALIAS_MISCDEV(UINPUT_MINOR); |
1088 | MODULE_ALIAS("devname:" UINPUT_NAME); | |
1da177e4 | 1089 | |
1da177e4 LT |
1090 | MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); |
1091 | MODULE_DESCRIPTION("User level driver support for input subsystem"); | |
1092 | MODULE_LICENSE("GPL"); |