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 | */ | |
34 | #include <linux/poll.h> | |
a99bbaf5 | 35 | #include <linux/sched.h> |
1da177e4 LT |
36 | #include <linux/slab.h> |
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
1da177e4 LT |
39 | #include <linux/fs.h> |
40 | #include <linux/miscdevice.h> | |
41 | #include <linux/uinput.h> | |
47c78e89 | 42 | #include <linux/input/mt.h> |
2d56f3a3 | 43 | #include "../input-compat.h" |
1da177e4 | 44 | |
54ce165e DT |
45 | static int uinput_dev_event(struct input_dev *dev, |
46 | unsigned int type, unsigned int code, int value) | |
1da177e4 | 47 | { |
373f9713 | 48 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 LT |
49 | |
50 | udev->buff[udev->head].type = type; | |
51 | udev->buff[udev->head].code = code; | |
52 | udev->buff[udev->head].value = value; | |
53 | do_gettimeofday(&udev->buff[udev->head].time); | |
54 | udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; | |
55 | ||
56 | wake_up_interruptible(&udev->waitq); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
05cebd38 | 61 | /* Atomically allocate an ID for the given request. Returns 0 on success. */ |
00ce756c DT |
62 | static bool uinput_request_alloc_id(struct uinput_device *udev, |
63 | struct uinput_request *request) | |
1da177e4 | 64 | { |
c5b3533a | 65 | unsigned int id; |
00ce756c | 66 | bool reserved = false; |
1da177e4 | 67 | |
0048e603 | 68 | spin_lock(&udev->requests_lock); |
152c12f5 | 69 | |
05cebd38 | 70 | for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { |
1da177e4 | 71 | if (!udev->requests[id]) { |
1da177e4 | 72 | request->id = id; |
0048e603 | 73 | udev->requests[id] = request; |
00ce756c | 74 | reserved = true; |
152c12f5 | 75 | break; |
1da177e4 | 76 | } |
05cebd38 | 77 | } |
152c12f5 | 78 | |
0048e603 | 79 | spin_unlock(&udev->requests_lock); |
00ce756c | 80 | return reserved; |
1da177e4 LT |
81 | } |
82 | ||
c5b3533a DT |
83 | static struct uinput_request *uinput_request_find(struct uinput_device *udev, |
84 | unsigned int id) | |
1da177e4 LT |
85 | { |
86 | /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ | |
c5b3533a | 87 | if (id >= UINPUT_NUM_REQUESTS) |
1da177e4 | 88 | return NULL; |
2d56f3a3 | 89 | |
1da177e4 LT |
90 | return udev->requests[id]; |
91 | } | |
92 | ||
00ce756c DT |
93 | static int uinput_request_reserve_slot(struct uinput_device *udev, |
94 | struct uinput_request *request) | |
1da177e4 | 95 | { |
0048e603 DT |
96 | /* Allocate slot. If none are available right away, wait. */ |
97 | return wait_event_interruptible(udev->requests_waitq, | |
00ce756c | 98 | uinput_request_alloc_id(udev, request)); |
0048e603 | 99 | } |
1da177e4 | 100 | |
54ce165e DT |
101 | static void uinput_request_done(struct uinput_device *udev, |
102 | struct uinput_request *request) | |
0048e603 | 103 | { |
0048e603 DT |
104 | /* Mark slot as available */ |
105 | udev->requests[request->id] = NULL; | |
e597f0c8 | 106 | wake_up(&udev->requests_waitq); |
e7507ed9 DT |
107 | |
108 | complete(&request->done); | |
1da177e4 LT |
109 | } |
110 | ||
00ce756c DT |
111 | static int uinput_request_send(struct uinput_device *udev, |
112 | struct uinput_request *request) | |
1da177e4 | 113 | { |
05cebd38 ASRF |
114 | int retval; |
115 | ||
05cebd38 ASRF |
116 | retval = mutex_lock_interruptible(&udev->mutex); |
117 | if (retval) | |
118 | return retval; | |
119 | ||
120 | if (udev->state != UIST_CREATED) { | |
121 | retval = -ENODEV; | |
122 | goto out; | |
123 | } | |
124 | ||
00ce756c DT |
125 | init_completion(&request->done); |
126 | ||
127 | /* | |
128 | * Tell our userspace application about this new request | |
129 | * by queueing an input event. | |
130 | */ | |
05cebd38 ASRF |
131 | uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); |
132 | ||
133 | out: | |
134 | mutex_unlock(&udev->mutex); | |
135 | return retval; | |
136 | } | |
137 | ||
00ce756c DT |
138 | static int uinput_request_submit(struct uinput_device *udev, |
139 | struct uinput_request *request) | |
140 | { | |
141 | int error; | |
142 | ||
143 | error = uinput_request_reserve_slot(udev, request); | |
144 | if (error) | |
145 | return error; | |
146 | ||
147 | error = uinput_request_send(udev, request); | |
148 | if (error) { | |
149 | uinput_request_done(udev, request); | |
150 | return error; | |
151 | } | |
152 | ||
153 | wait_for_completion(&request->done); | |
154 | return request->retval; | |
155 | } | |
156 | ||
05cebd38 | 157 | /* |
54ce165e | 158 | * Fail all outstanding requests so handlers don't wait for the userspace |
05cebd38 ASRF |
159 | * to finish processing them. |
160 | */ | |
161 | static void uinput_flush_requests(struct uinput_device *udev) | |
162 | { | |
163 | struct uinput_request *request; | |
164 | int i; | |
1da177e4 | 165 | |
05cebd38 ASRF |
166 | spin_lock(&udev->requests_lock); |
167 | ||
168 | for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { | |
169 | request = udev->requests[i]; | |
170 | if (request) { | |
171 | request->retval = -ENODEV; | |
172 | uinput_request_done(udev, request); | |
173 | } | |
174 | } | |
175 | ||
176 | spin_unlock(&udev->requests_lock); | |
1da177e4 LT |
177 | } |
178 | ||
ff462551 AH |
179 | static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) |
180 | { | |
181 | uinput_dev_event(dev, EV_FF, FF_GAIN, gain); | |
182 | } | |
183 | ||
184 | static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) | |
185 | { | |
186 | uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); | |
187 | } | |
188 | ||
189 | static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) | |
190 | { | |
191 | return uinput_dev_event(dev, EV_FF, effect_id, value); | |
192 | } | |
193 | ||
54ce165e DT |
194 | static int uinput_dev_upload_effect(struct input_dev *dev, |
195 | struct ff_effect *effect, | |
196 | struct ff_effect *old) | |
1da177e4 | 197 | { |
05cebd38 | 198 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 LT |
199 | struct uinput_request request; |
200 | ||
2d56f3a3 PL |
201 | /* |
202 | * uinput driver does not currently support periodic effects with | |
203 | * custom waveform since it does not have a way to pass buffer of | |
204 | * samples (custom_data) to userspace. If ever there is a device | |
205 | * supporting custom waveforms we would need to define an additional | |
206 | * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. | |
207 | */ | |
208 | if (effect->type == FF_PERIODIC && | |
209 | effect->u.periodic.waveform == FF_CUSTOM) | |
210 | return -EINVAL; | |
211 | ||
0048e603 | 212 | request.code = UI_FF_UPLOAD; |
ff462551 AH |
213 | request.u.upload.effect = effect; |
214 | request.u.upload.old = old; | |
0048e603 | 215 | |
00ce756c | 216 | return uinput_request_submit(udev, &request); |
1da177e4 LT |
217 | } |
218 | ||
219 | static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) | |
220 | { | |
05cebd38 | 221 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 LT |
222 | struct uinput_request request; |
223 | ||
224 | if (!test_bit(EV_FF, dev->evbit)) | |
225 | return -ENOSYS; | |
226 | ||
0048e603 | 227 | request.code = UI_FF_ERASE; |
1da177e4 | 228 | request.u.effect_id = effect_id; |
0048e603 | 229 | |
00ce756c | 230 | return uinput_request_submit(udev, &request); |
1da177e4 LT |
231 | } |
232 | ||
29506415 | 233 | static void uinput_destroy_device(struct uinput_device *udev) |
1da177e4 | 234 | { |
29506415 | 235 | const char *name, *phys; |
05cebd38 ASRF |
236 | struct input_dev *dev = udev->dev; |
237 | enum uinput_state old_state = udev->state; | |
238 | ||
239 | udev->state = UIST_NEW_DEVICE; | |
29506415 | 240 | |
05cebd38 ASRF |
241 | if (dev) { |
242 | name = dev->name; | |
243 | phys = dev->phys; | |
244 | if (old_state == UIST_CREATED) { | |
245 | uinput_flush_requests(udev); | |
246 | input_unregister_device(dev); | |
247 | } else { | |
248 | input_free_device(dev); | |
249 | } | |
29506415 DT |
250 | kfree(name); |
251 | kfree(phys); | |
252 | udev->dev = NULL; | |
1da177e4 | 253 | } |
1da177e4 LT |
254 | } |
255 | ||
29506415 | 256 | static int uinput_create_device(struct uinput_device *udev) |
1da177e4 | 257 | { |
ff462551 | 258 | struct input_dev *dev = udev->dev; |
29506415 DT |
259 | int error; |
260 | ||
261 | if (udev->state != UIST_SETUP_COMPLETE) { | |
262 | printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); | |
1da177e4 LT |
263 | return -EINVAL; |
264 | } | |
265 | ||
ff462551 AH |
266 | if (udev->ff_effects_max) { |
267 | error = input_ff_create(dev, udev->ff_effects_max); | |
268 | if (error) | |
269 | goto fail1; | |
270 | ||
271 | dev->ff->upload = uinput_dev_upload_effect; | |
272 | dev->ff->erase = uinput_dev_erase_effect; | |
273 | dev->ff->playback = uinput_dev_playback; | |
274 | dev->ff->set_gain = uinput_dev_set_gain; | |
275 | dev->ff->set_autocenter = uinput_dev_set_autocenter; | |
29506415 | 276 | } |
1da177e4 | 277 | |
ff462551 AH |
278 | error = input_register_device(udev->dev); |
279 | if (error) | |
280 | goto fail2; | |
281 | ||
29506415 | 282 | udev->state = UIST_CREATED; |
1da177e4 LT |
283 | |
284 | return 0; | |
ff462551 AH |
285 | |
286 | fail2: input_ff_destroy(dev); | |
287 | fail1: uinput_destroy_device(udev); | |
288 | return error; | |
1da177e4 LT |
289 | } |
290 | ||
291 | static int uinput_open(struct inode *inode, struct file *file) | |
292 | { | |
29506415 | 293 | struct uinput_device *newdev; |
1da177e4 | 294 | |
29506415 | 295 | newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); |
1da177e4 | 296 | if (!newdev) |
29506415 DT |
297 | return -ENOMEM; |
298 | ||
221979aa | 299 | mutex_init(&newdev->mutex); |
0048e603 | 300 | spin_lock_init(&newdev->requests_lock); |
1da177e4 | 301 | init_waitqueue_head(&newdev->requests_waitq); |
29506415 DT |
302 | init_waitqueue_head(&newdev->waitq); |
303 | newdev->state = UIST_NEW_DEVICE; | |
1da177e4 LT |
304 | |
305 | file->private_data = newdev; | |
daf8a96b | 306 | nonseekable_open(inode, file); |
1da177e4 LT |
307 | |
308 | return 0; | |
1da177e4 LT |
309 | } |
310 | ||
311 | static int uinput_validate_absbits(struct input_dev *dev) | |
312 | { | |
313 | unsigned int cnt; | |
bcb898e5 DH |
314 | int nslot; |
315 | ||
316 | if (!test_bit(EV_ABS, dev->evbit)) | |
317 | return 0; | |
318 | ||
319 | /* | |
320 | * Check if absmin/absmax/absfuzz/absflat are sane. | |
321 | */ | |
1da177e4 | 322 | |
81c2a3ba | 323 | for (cnt = 0; cnt < ABS_CNT; cnt++) { |
a718d79c | 324 | int min, max; |
1da177e4 LT |
325 | if (!test_bit(cnt, dev->absbit)) |
326 | continue; | |
327 | ||
a718d79c PH |
328 | min = input_abs_get_min(dev, cnt); |
329 | max = input_abs_get_max(dev, cnt); | |
330 | ||
331 | if ((min != 0 || max != 0) && max <= min) { | |
1da177e4 LT |
332 | printk(KERN_DEBUG |
333 | "%s: invalid abs[%02x] min:%d max:%d\n", | |
334 | UINPUT_NAME, cnt, | |
987a6c02 DM |
335 | input_abs_get_min(dev, cnt), |
336 | input_abs_get_max(dev, cnt)); | |
bcb898e5 | 337 | return -EINVAL; |
1da177e4 LT |
338 | } |
339 | ||
987a6c02 DM |
340 | if (input_abs_get_flat(dev, cnt) > |
341 | input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { | |
1da177e4 | 342 | printk(KERN_DEBUG |
987a6c02 | 343 | "%s: abs_flat #%02x out of range: %d " |
1da177e4 | 344 | "(min:%d/max:%d)\n", |
987a6c02 DM |
345 | UINPUT_NAME, cnt, |
346 | input_abs_get_flat(dev, cnt), | |
347 | input_abs_get_min(dev, cnt), | |
348 | input_abs_get_max(dev, cnt)); | |
bcb898e5 | 349 | return -EINVAL; |
1da177e4 LT |
350 | } |
351 | } | |
bcb898e5 DH |
352 | |
353 | if (test_bit(ABS_MT_SLOT, dev->absbit)) { | |
354 | nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; | |
355 | input_mt_init_slots(dev, nslot, 0); | |
356 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { | |
357 | input_set_events_per_packet(dev, 60); | |
358 | } | |
359 | ||
360 | return 0; | |
1da177e4 LT |
361 | } |
362 | ||
29506415 DT |
363 | static int uinput_allocate_device(struct uinput_device *udev) |
364 | { | |
365 | udev->dev = input_allocate_device(); | |
366 | if (!udev->dev) | |
367 | return -ENOMEM; | |
368 | ||
369 | udev->dev->event = uinput_dev_event; | |
373f9713 | 370 | input_set_drvdata(udev->dev, udev); |
29506415 DT |
371 | |
372 | return 0; | |
373 | } | |
374 | ||
54ce165e DT |
375 | static int uinput_setup_device(struct uinput_device *udev, |
376 | const char __user *buffer, size_t count) | |
1da177e4 LT |
377 | { |
378 | struct uinput_user_dev *user_dev; | |
379 | struct input_dev *dev; | |
5d9d6e91 | 380 | int i; |
152c12f5 | 381 | int retval; |
1da177e4 | 382 | |
29506415 DT |
383 | if (count != sizeof(struct uinput_user_dev)) |
384 | return -EINVAL; | |
385 | ||
386 | if (!udev->dev) { | |
387 | retval = uinput_allocate_device(udev); | |
388 | if (retval) | |
389 | return retval; | |
390 | } | |
1da177e4 | 391 | |
1da177e4 LT |
392 | dev = udev->dev; |
393 | ||
4dfcc271 | 394 | user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev)); |
163d2770 | 395 | if (IS_ERR(user_dev)) |
4dfcc271 | 396 | return PTR_ERR(user_dev); |
1da177e4 | 397 | |
ff462551 AH |
398 | udev->ff_effects_max = user_dev->ff_effects_max; |
399 | ||
5d9d6e91 DH |
400 | /* Ensure name is filled in */ |
401 | if (!user_dev->name[0]) { | |
29506415 DT |
402 | retval = -EINVAL; |
403 | goto exit; | |
404 | } | |
405 | ||
406 | kfree(dev->name); | |
5d9d6e91 DH |
407 | dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE, |
408 | GFP_KERNEL); | |
409 | if (!dev->name) { | |
1da177e4 LT |
410 | retval = -ENOMEM; |
411 | goto exit; | |
412 | } | |
413 | ||
1da177e4 LT |
414 | dev->id.bustype = user_dev->id.bustype; |
415 | dev->id.vendor = user_dev->id.vendor; | |
416 | dev->id.product = user_dev->id.product; | |
417 | dev->id.version = user_dev->id.version; | |
1da177e4 | 418 | |
987a6c02 DM |
419 | for (i = 0; i < ABS_CNT; i++) { |
420 | input_abs_set_max(dev, i, user_dev->absmax[i]); | |
421 | input_abs_set_min(dev, i, user_dev->absmin[i]); | |
422 | input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); | |
423 | input_abs_set_flat(dev, i, user_dev->absflat[i]); | |
424 | } | |
1da177e4 | 425 | |
bcb898e5 DH |
426 | retval = uinput_validate_absbits(dev); |
427 | if (retval < 0) | |
428 | goto exit; | |
1da177e4 | 429 | |
29506415 DT |
430 | udev->state = UIST_SETUP_COMPLETE; |
431 | retval = count; | |
432 | ||
433 | exit: | |
1da177e4 LT |
434 | kfree(user_dev); |
435 | return retval; | |
436 | } | |
437 | ||
cbf05413 RM |
438 | static ssize_t uinput_inject_events(struct uinput_device *udev, |
439 | const char __user *buffer, size_t count) | |
29506415 DT |
440 | { |
441 | struct input_event ev; | |
cbf05413 | 442 | size_t bytes = 0; |
29506415 | 443 | |
cbf05413 | 444 | if (count != 0 && count < input_event_size()) |
29506415 DT |
445 | return -EINVAL; |
446 | ||
cbf05413 RM |
447 | while (bytes + input_event_size() <= count) { |
448 | /* | |
449 | * Note that even if some events were fetched successfully | |
450 | * we are still going to return EFAULT instead of partial | |
451 | * count to let userspace know that it got it's buffers | |
452 | * all wrong. | |
453 | */ | |
454 | if (input_event_from_user(buffer + bytes, &ev)) | |
455 | return -EFAULT; | |
29506415 | 456 | |
cbf05413 RM |
457 | input_event(udev->dev, ev.type, ev.code, ev.value); |
458 | bytes += input_event_size(); | |
459 | } | |
29506415 | 460 | |
cbf05413 | 461 | return bytes; |
29506415 DT |
462 | } |
463 | ||
54ce165e DT |
464 | static ssize_t uinput_write(struct file *file, const char __user *buffer, |
465 | size_t count, loff_t *ppos) | |
1da177e4 LT |
466 | { |
467 | struct uinput_device *udev = file->private_data; | |
29506415 | 468 | int retval; |
1da177e4 | 469 | |
22ae19c6 DT |
470 | if (count == 0) |
471 | return 0; | |
472 | ||
221979aa | 473 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
474 | if (retval) |
475 | return retval; | |
476 | ||
477 | retval = udev->state == UIST_CREATED ? | |
cbf05413 | 478 | uinput_inject_events(udev, buffer, count) : |
29506415 | 479 | uinput_setup_device(udev, buffer, count); |
1da177e4 | 480 | |
221979aa | 481 | mutex_unlock(&udev->mutex); |
1da177e4 | 482 | |
29506415 | 483 | return retval; |
1da177e4 LT |
484 | } |
485 | ||
929d1af5 DT |
486 | static bool uinput_fetch_next_event(struct uinput_device *udev, |
487 | struct input_event *event) | |
488 | { | |
489 | bool have_event; | |
490 | ||
491 | spin_lock_irq(&udev->dev->event_lock); | |
492 | ||
493 | have_event = udev->head != udev->tail; | |
494 | if (have_event) { | |
495 | *event = udev->buff[udev->tail]; | |
496 | udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; | |
497 | } | |
498 | ||
499 | spin_unlock_irq(&udev->dev->event_lock); | |
500 | ||
501 | return have_event; | |
502 | } | |
503 | ||
22ae19c6 DT |
504 | static ssize_t uinput_events_to_user(struct uinput_device *udev, |
505 | char __user *buffer, size_t count) | |
1da177e4 | 506 | { |
929d1af5 | 507 | struct input_event event; |
22ae19c6 | 508 | size_t read = 0; |
1da177e4 | 509 | |
22ae19c6 DT |
510 | while (read + input_event_size() <= count && |
511 | uinput_fetch_next_event(udev, &event)) { | |
f40033ac | 512 | |
00ce756c DT |
513 | if (input_event_to_user(buffer + read, &event)) |
514 | return -EFAULT; | |
1da177e4 | 515 | |
22ae19c6 DT |
516 | read += input_event_size(); |
517 | } | |
1da177e4 | 518 | |
00ce756c | 519 | return read; |
22ae19c6 | 520 | } |
1da177e4 | 521 | |
22ae19c6 DT |
522 | static ssize_t uinput_read(struct file *file, char __user *buffer, |
523 | size_t count, loff_t *ppos) | |
524 | { | |
525 | struct uinput_device *udev = file->private_data; | |
526 | ssize_t retval; | |
29506415 | 527 | |
22ae19c6 DT |
528 | if (count != 0 && count < input_event_size()) |
529 | return -EINVAL; | |
1da177e4 | 530 | |
22ae19c6 DT |
531 | do { |
532 | retval = mutex_lock_interruptible(&udev->mutex); | |
533 | if (retval) | |
534 | return retval; | |
929d1af5 | 535 | |
22ae19c6 DT |
536 | if (udev->state != UIST_CREATED) |
537 | retval = -ENODEV; | |
538 | else if (udev->head == udev->tail && | |
539 | (file->f_flags & O_NONBLOCK)) | |
540 | retval = -EAGAIN; | |
541 | else | |
542 | retval = uinput_events_to_user(udev, buffer, count); | |
929d1af5 | 543 | |
22ae19c6 | 544 | mutex_unlock(&udev->mutex); |
1da177e4 | 545 | |
22ae19c6 DT |
546 | if (retval || count == 0) |
547 | break; | |
548 | ||
549 | if (!(file->f_flags & O_NONBLOCK)) | |
550 | retval = wait_event_interruptible(udev->waitq, | |
551 | udev->head != udev->tail || | |
552 | udev->state != UIST_CREATED); | |
553 | } while (retval == 0); | |
29506415 | 554 | |
1da177e4 LT |
555 | return retval; |
556 | } | |
557 | ||
558 | static unsigned int uinput_poll(struct file *file, poll_table *wait) | |
559 | { | |
560 | struct uinput_device *udev = file->private_data; | |
561 | ||
562 | poll_wait(file, &udev->waitq, wait); | |
563 | ||
564 | if (udev->head != udev->tail) | |
565 | return POLLIN | POLLRDNORM; | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
29506415 | 570 | static int uinput_release(struct inode *inode, struct file *file) |
1da177e4 | 571 | { |
29506415 | 572 | struct uinput_device *udev = file->private_data; |
1da177e4 | 573 | |
29506415 | 574 | uinput_destroy_device(udev); |
1da177e4 LT |
575 | kfree(udev); |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
2d56f3a3 PL |
580 | #ifdef CONFIG_COMPAT |
581 | struct uinput_ff_upload_compat { | |
c5b3533a DT |
582 | __u32 request_id; |
583 | __s32 retval; | |
2d56f3a3 PL |
584 | struct ff_effect_compat effect; |
585 | struct ff_effect_compat old; | |
586 | }; | |
587 | ||
588 | static int uinput_ff_upload_to_user(char __user *buffer, | |
589 | const struct uinput_ff_upload *ff_up) | |
590 | { | |
591 | if (INPUT_COMPAT_TEST) { | |
592 | struct uinput_ff_upload_compat ff_up_compat; | |
593 | ||
594 | ff_up_compat.request_id = ff_up->request_id; | |
595 | ff_up_compat.retval = ff_up->retval; | |
596 | /* | |
597 | * It so happens that the pointer that gives us the trouble | |
598 | * is the last field in the structure. Since we don't support | |
599 | * custom waveforms in uinput anyway we can just copy the whole | |
600 | * thing (to the compat size) and ignore the pointer. | |
601 | */ | |
602 | memcpy(&ff_up_compat.effect, &ff_up->effect, | |
603 | sizeof(struct ff_effect_compat)); | |
604 | memcpy(&ff_up_compat.old, &ff_up->old, | |
605 | sizeof(struct ff_effect_compat)); | |
606 | ||
607 | if (copy_to_user(buffer, &ff_up_compat, | |
608 | sizeof(struct uinput_ff_upload_compat))) | |
609 | return -EFAULT; | |
610 | } else { | |
611 | if (copy_to_user(buffer, ff_up, | |
612 | sizeof(struct uinput_ff_upload))) | |
613 | return -EFAULT; | |
614 | } | |
615 | ||
616 | return 0; | |
617 | } | |
618 | ||
619 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
620 | struct uinput_ff_upload *ff_up) | |
621 | { | |
622 | if (INPUT_COMPAT_TEST) { | |
623 | struct uinput_ff_upload_compat ff_up_compat; | |
624 | ||
625 | if (copy_from_user(&ff_up_compat, buffer, | |
626 | sizeof(struct uinput_ff_upload_compat))) | |
627 | return -EFAULT; | |
628 | ||
629 | ff_up->request_id = ff_up_compat.request_id; | |
630 | ff_up->retval = ff_up_compat.retval; | |
631 | memcpy(&ff_up->effect, &ff_up_compat.effect, | |
632 | sizeof(struct ff_effect_compat)); | |
633 | memcpy(&ff_up->old, &ff_up_compat.old, | |
634 | sizeof(struct ff_effect_compat)); | |
635 | ||
636 | } else { | |
637 | if (copy_from_user(ff_up, buffer, | |
638 | sizeof(struct uinput_ff_upload))) | |
639 | return -EFAULT; | |
640 | } | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | #else | |
646 | ||
647 | static int uinput_ff_upload_to_user(char __user *buffer, | |
648 | const struct uinput_ff_upload *ff_up) | |
649 | { | |
650 | if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) | |
651 | return -EFAULT; | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
657 | struct uinput_ff_upload *ff_up) | |
658 | { | |
659 | if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) | |
660 | return -EFAULT; | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | #endif | |
666 | ||
29506415 DT |
667 | #define uinput_set_bit(_arg, _bit, _max) \ |
668 | ({ \ | |
669 | int __ret = 0; \ | |
670 | if (udev->state == UIST_CREATED) \ | |
671 | __ret = -EINVAL; \ | |
672 | else if ((_arg) > (_max)) \ | |
673 | __ret = -EINVAL; \ | |
674 | else set_bit((_arg), udev->dev->_bit); \ | |
675 | __ret; \ | |
676 | }) | |
677 | ||
e3480a61 BT |
678 | static int uinput_str_to_user(void __user *dest, const char *str, |
679 | unsigned int maxlen) | |
680 | { | |
681 | char __user *p = dest; | |
682 | int len, ret; | |
683 | ||
684 | if (!str) | |
685 | return -ENOENT; | |
686 | ||
687 | if (maxlen == 0) | |
688 | return -EINVAL; | |
689 | ||
690 | len = strlen(str) + 1; | |
691 | if (len > maxlen) | |
692 | len = maxlen; | |
693 | ||
694 | ret = copy_to_user(p, str, len); | |
695 | if (ret) | |
696 | return -EFAULT; | |
697 | ||
698 | /* force terminating '\0' */ | |
699 | ret = put_user(0, p + len - 1); | |
700 | return ret ? -EFAULT : len; | |
701 | } | |
702 | ||
2d56f3a3 PL |
703 | static long uinput_ioctl_handler(struct file *file, unsigned int cmd, |
704 | unsigned long arg, void __user *p) | |
1da177e4 | 705 | { |
29506415 | 706 | int retval; |
2d56f3a3 | 707 | struct uinput_device *udev = file->private_data; |
1da177e4 LT |
708 | struct uinput_ff_upload ff_up; |
709 | struct uinput_ff_erase ff_erase; | |
710 | struct uinput_request *req; | |
5b6271bd | 711 | char *phys; |
e3480a61 BT |
712 | const char *name; |
713 | unsigned int size; | |
1da177e4 | 714 | |
221979aa | 715 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
716 | if (retval) |
717 | return retval; | |
718 | ||
719 | if (!udev->dev) { | |
720 | retval = uinput_allocate_device(udev); | |
721 | if (retval) | |
722 | goto out; | |
1da177e4 LT |
723 | } |
724 | ||
725 | switch (cmd) { | |
ba4e9a61 DH |
726 | case UI_GET_VERSION: |
727 | if (put_user(UINPUT_VERSION, | |
728 | (unsigned int __user *)p)) | |
729 | retval = -EFAULT; | |
730 | goto out; | |
731 | ||
1da177e4 LT |
732 | case UI_DEV_CREATE: |
733 | retval = uinput_create_device(udev); | |
9d51e801 | 734 | goto out; |
1da177e4 LT |
735 | |
736 | case UI_DEV_DESTROY: | |
29506415 | 737 | uinput_destroy_device(udev); |
9d51e801 | 738 | goto out; |
1da177e4 LT |
739 | |
740 | case UI_SET_EVBIT: | |
29506415 | 741 | retval = uinput_set_bit(arg, evbit, EV_MAX); |
9d51e801 | 742 | goto out; |
1da177e4 LT |
743 | |
744 | case UI_SET_KEYBIT: | |
29506415 | 745 | retval = uinput_set_bit(arg, keybit, KEY_MAX); |
9d51e801 | 746 | goto out; |
1da177e4 LT |
747 | |
748 | case UI_SET_RELBIT: | |
29506415 | 749 | retval = uinput_set_bit(arg, relbit, REL_MAX); |
9d51e801 | 750 | goto out; |
1da177e4 LT |
751 | |
752 | case UI_SET_ABSBIT: | |
29506415 | 753 | retval = uinput_set_bit(arg, absbit, ABS_MAX); |
9d51e801 | 754 | goto out; |
1da177e4 LT |
755 | |
756 | case UI_SET_MSCBIT: | |
29506415 | 757 | retval = uinput_set_bit(arg, mscbit, MSC_MAX); |
9d51e801 | 758 | goto out; |
1da177e4 LT |
759 | |
760 | case UI_SET_LEDBIT: | |
29506415 | 761 | retval = uinput_set_bit(arg, ledbit, LED_MAX); |
9d51e801 | 762 | goto out; |
1da177e4 LT |
763 | |
764 | case UI_SET_SNDBIT: | |
29506415 | 765 | retval = uinput_set_bit(arg, sndbit, SND_MAX); |
9d51e801 | 766 | goto out; |
1da177e4 LT |
767 | |
768 | case UI_SET_FFBIT: | |
29506415 | 769 | retval = uinput_set_bit(arg, ffbit, FF_MAX); |
9d51e801 | 770 | goto out; |
1da177e4 | 771 | |
59c7c037 DT |
772 | case UI_SET_SWBIT: |
773 | retval = uinput_set_bit(arg, swbit, SW_MAX); | |
9d51e801 | 774 | goto out; |
59c7c037 | 775 | |
85b77200 HR |
776 | case UI_SET_PROPBIT: |
777 | retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX); | |
9d51e801 | 778 | goto out; |
85b77200 | 779 | |
1da177e4 | 780 | case UI_SET_PHYS: |
29506415 DT |
781 | if (udev->state == UIST_CREATED) { |
782 | retval = -EINVAL; | |
783 | goto out; | |
784 | } | |
4dfcc271 DT |
785 | |
786 | phys = strndup_user(p, 1024); | |
787 | if (IS_ERR(phys)) { | |
788 | retval = PTR_ERR(phys); | |
789 | goto out; | |
1da177e4 | 790 | } |
4dfcc271 | 791 | |
5b6271bd | 792 | kfree(udev->dev->phys); |
4dfcc271 | 793 | udev->dev->phys = phys; |
9d51e801 | 794 | goto out; |
1da177e4 LT |
795 | |
796 | case UI_BEGIN_FF_UPLOAD: | |
2d56f3a3 PL |
797 | retval = uinput_ff_upload_from_user(p, &ff_up); |
798 | if (retval) | |
9d51e801 | 799 | goto out; |
2d56f3a3 | 800 | |
1da177e4 | 801 | req = uinput_request_find(udev, ff_up.request_id); |
54ce165e DT |
802 | if (!req || req->code != UI_FF_UPLOAD || |
803 | !req->u.upload.effect) { | |
1da177e4 | 804 | retval = -EINVAL; |
9d51e801 | 805 | goto out; |
1da177e4 | 806 | } |
2d56f3a3 | 807 | |
1da177e4 | 808 | ff_up.retval = 0; |
2d56f3a3 | 809 | ff_up.effect = *req->u.upload.effect; |
ff462551 | 810 | if (req->u.upload.old) |
2d56f3a3 | 811 | ff_up.old = *req->u.upload.old; |
ff462551 AH |
812 | else |
813 | memset(&ff_up.old, 0, sizeof(struct ff_effect)); | |
814 | ||
2d56f3a3 | 815 | retval = uinput_ff_upload_to_user(p, &ff_up); |
9d51e801 | 816 | goto out; |
1da177e4 LT |
817 | |
818 | case UI_BEGIN_FF_ERASE: | |
819 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
820 | retval = -EFAULT; | |
9d51e801 | 821 | goto out; |
1da177e4 | 822 | } |
2d56f3a3 | 823 | |
1da177e4 | 824 | req = uinput_request_find(udev, ff_erase.request_id); |
2d56f3a3 | 825 | if (!req || req->code != UI_FF_ERASE) { |
1da177e4 | 826 | retval = -EINVAL; |
9d51e801 | 827 | goto out; |
1da177e4 | 828 | } |
2d56f3a3 | 829 | |
1da177e4 LT |
830 | ff_erase.retval = 0; |
831 | ff_erase.effect_id = req->u.effect_id; | |
832 | if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { | |
833 | retval = -EFAULT; | |
9d51e801 | 834 | goto out; |
1da177e4 | 835 | } |
2d56f3a3 | 836 | |
9d51e801 | 837 | goto out; |
1da177e4 LT |
838 | |
839 | case UI_END_FF_UPLOAD: | |
2d56f3a3 PL |
840 | retval = uinput_ff_upload_from_user(p, &ff_up); |
841 | if (retval) | |
9d51e801 | 842 | goto out; |
2d56f3a3 | 843 | |
1da177e4 | 844 | req = uinput_request_find(udev, ff_up.request_id); |
2d56f3a3 PL |
845 | if (!req || req->code != UI_FF_UPLOAD || |
846 | !req->u.upload.effect) { | |
1da177e4 | 847 | retval = -EINVAL; |
9d51e801 | 848 | goto out; |
1da177e4 | 849 | } |
2d56f3a3 | 850 | |
1da177e4 | 851 | req->retval = ff_up.retval; |
0048e603 | 852 | uinput_request_done(udev, req); |
9d51e801 | 853 | goto out; |
1da177e4 LT |
854 | |
855 | case UI_END_FF_ERASE: | |
856 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
857 | retval = -EFAULT; | |
9d51e801 | 858 | goto out; |
1da177e4 | 859 | } |
2d56f3a3 | 860 | |
1da177e4 | 861 | req = uinput_request_find(udev, ff_erase.request_id); |
2d56f3a3 | 862 | if (!req || req->code != UI_FF_ERASE) { |
1da177e4 | 863 | retval = -EINVAL; |
9d51e801 | 864 | goto out; |
1da177e4 | 865 | } |
2d56f3a3 | 866 | |
1da177e4 | 867 | req->retval = ff_erase.retval; |
0048e603 | 868 | uinput_request_done(udev, req); |
9d51e801 | 869 | goto out; |
1da177e4 | 870 | } |
29506415 | 871 | |
e3480a61 BT |
872 | size = _IOC_SIZE(cmd); |
873 | ||
874 | /* Now check variable-length commands */ | |
875 | switch (cmd & ~IOCSIZE_MASK) { | |
876 | case UI_GET_SYSNAME(0): | |
877 | if (udev->state != UIST_CREATED) { | |
878 | retval = -ENOENT; | |
879 | goto out; | |
880 | } | |
881 | name = dev_name(&udev->dev->dev); | |
882 | retval = uinput_str_to_user(p, name, size); | |
883 | goto out; | |
884 | } | |
885 | ||
9d51e801 | 886 | retval = -EINVAL; |
29506415 | 887 | out: |
221979aa | 888 | mutex_unlock(&udev->mutex); |
1da177e4 LT |
889 | return retval; |
890 | } | |
891 | ||
2d56f3a3 PL |
892 | static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
893 | { | |
894 | return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); | |
895 | } | |
896 | ||
897 | #ifdef CONFIG_COMPAT | |
54ce165e DT |
898 | static long uinput_compat_ioctl(struct file *file, |
899 | unsigned int cmd, unsigned long arg) | |
2d56f3a3 PL |
900 | { |
901 | return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); | |
902 | } | |
903 | #endif | |
904 | ||
2b8693c0 | 905 | static const struct file_operations uinput_fops = { |
29506415 DT |
906 | .owner = THIS_MODULE, |
907 | .open = uinput_open, | |
908 | .release = uinput_release, | |
909 | .read = uinput_read, | |
910 | .write = uinput_write, | |
911 | .poll = uinput_poll, | |
912 | .unlocked_ioctl = uinput_ioctl, | |
2d56f3a3 PL |
913 | #ifdef CONFIG_COMPAT |
914 | .compat_ioctl = uinput_compat_ioctl, | |
915 | #endif | |
6038f373 | 916 | .llseek = no_llseek, |
1da177e4 LT |
917 | }; |
918 | ||
919 | static struct miscdevice uinput_misc = { | |
29506415 DT |
920 | .fops = &uinput_fops, |
921 | .minor = UINPUT_MINOR, | |
922 | .name = UINPUT_NAME, | |
1da177e4 | 923 | }; |
8905aaaf KS |
924 | MODULE_ALIAS_MISCDEV(UINPUT_MINOR); |
925 | MODULE_ALIAS("devname:" UINPUT_NAME); | |
1da177e4 LT |
926 | |
927 | static int __init uinput_init(void) | |
928 | { | |
929 | return misc_register(&uinput_misc); | |
930 | } | |
931 | ||
932 | static void __exit uinput_exit(void) | |
933 | { | |
934 | misc_deregister(&uinput_misc); | |
935 | } | |
936 | ||
937 | MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); | |
938 | MODULE_DESCRIPTION("User level driver support for input subsystem"); | |
939 | MODULE_LICENSE("GPL"); | |
ff462551 | 940 | MODULE_VERSION("0.3"); |
1da177e4 LT |
941 | |
942 | module_init(uinput_init); | |
943 | module_exit(uinput_exit); |