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Commit | Line | Data |
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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: | |
ff462551 AH |
23 | * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>) |
24 | * - updated ff support for the changes in kernel interface | |
25 | * - added MODULE_VERSION | |
1da177e4 LT |
26 | * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>) |
27 | * - added force feedback support | |
28 | * - added UI_SET_PHYS | |
29 | * 0.1 20/06/2002 | |
30 | * - first public version | |
31 | */ | |
32 | #include <linux/poll.h> | |
a99bbaf5 | 33 | #include <linux/sched.h> |
1da177e4 LT |
34 | #include <linux/slab.h> |
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
1da177e4 LT |
37 | #include <linux/smp_lock.h> |
38 | #include <linux/fs.h> | |
39 | #include <linux/miscdevice.h> | |
40 | #include <linux/uinput.h> | |
2d56f3a3 | 41 | #include "../input-compat.h" |
1da177e4 | 42 | |
1da177e4 LT |
43 | static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) |
44 | { | |
373f9713 | 45 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 LT |
46 | |
47 | udev->buff[udev->head].type = type; | |
48 | udev->buff[udev->head].code = code; | |
49 | udev->buff[udev->head].value = value; | |
50 | do_gettimeofday(&udev->buff[udev->head].time); | |
51 | udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; | |
52 | ||
53 | wake_up_interruptible(&udev->waitq); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
05cebd38 | 58 | /* Atomically allocate an ID for the given request. Returns 0 on success. */ |
0048e603 | 59 | static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request) |
1da177e4 | 60 | { |
1da177e4 | 61 | int id; |
152c12f5 | 62 | int err = -1; |
1da177e4 | 63 | |
0048e603 | 64 | spin_lock(&udev->requests_lock); |
152c12f5 | 65 | |
05cebd38 | 66 | for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { |
1da177e4 | 67 | if (!udev->requests[id]) { |
1da177e4 | 68 | request->id = id; |
0048e603 | 69 | udev->requests[id] = request; |
152c12f5 DT |
70 | err = 0; |
71 | break; | |
1da177e4 | 72 | } |
05cebd38 | 73 | } |
152c12f5 | 74 | |
0048e603 | 75 | spin_unlock(&udev->requests_lock); |
152c12f5 | 76 | return err; |
1da177e4 LT |
77 | } |
78 | ||
05cebd38 | 79 | static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id) |
1da177e4 LT |
80 | { |
81 | /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ | |
82 | if (id >= UINPUT_NUM_REQUESTS || id < 0) | |
83 | return NULL; | |
2d56f3a3 | 84 | |
1da177e4 LT |
85 | return udev->requests[id]; |
86 | } | |
87 | ||
0048e603 | 88 | static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request) |
1da177e4 | 89 | { |
0048e603 DT |
90 | /* Allocate slot. If none are available right away, wait. */ |
91 | return wait_event_interruptible(udev->requests_waitq, | |
92 | !uinput_request_alloc_id(udev, request)); | |
93 | } | |
1da177e4 | 94 | |
0048e603 DT |
95 | static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request) |
96 | { | |
0048e603 DT |
97 | /* Mark slot as available */ |
98 | udev->requests[request->id] = NULL; | |
e597f0c8 | 99 | wake_up(&udev->requests_waitq); |
e7507ed9 DT |
100 | |
101 | complete(&request->done); | |
1da177e4 LT |
102 | } |
103 | ||
05cebd38 | 104 | static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request) |
1da177e4 | 105 | { |
05cebd38 ASRF |
106 | int retval; |
107 | ||
108 | retval = uinput_request_reserve_slot(udev, request); | |
109 | if (retval) | |
110 | return retval; | |
111 | ||
112 | retval = mutex_lock_interruptible(&udev->mutex); | |
113 | if (retval) | |
114 | return retval; | |
115 | ||
116 | if (udev->state != UIST_CREATED) { | |
117 | retval = -ENODEV; | |
118 | goto out; | |
119 | } | |
120 | ||
1da177e4 | 121 | /* Tell our userspace app about this new request by queueing an input event */ |
05cebd38 ASRF |
122 | uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); |
123 | ||
124 | out: | |
125 | mutex_unlock(&udev->mutex); | |
126 | return retval; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Fail all ouitstanding requests so handlers don't wait for the userspace | |
131 | * to finish processing them. | |
132 | */ | |
133 | static void uinput_flush_requests(struct uinput_device *udev) | |
134 | { | |
135 | struct uinput_request *request; | |
136 | int i; | |
1da177e4 | 137 | |
05cebd38 ASRF |
138 | spin_lock(&udev->requests_lock); |
139 | ||
140 | for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { | |
141 | request = udev->requests[i]; | |
142 | if (request) { | |
143 | request->retval = -ENODEV; | |
144 | uinput_request_done(udev, request); | |
145 | } | |
146 | } | |
147 | ||
148 | spin_unlock(&udev->requests_lock); | |
1da177e4 LT |
149 | } |
150 | ||
ff462551 AH |
151 | static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) |
152 | { | |
153 | uinput_dev_event(dev, EV_FF, FF_GAIN, gain); | |
154 | } | |
155 | ||
156 | static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) | |
157 | { | |
158 | uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); | |
159 | } | |
160 | ||
161 | static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) | |
162 | { | |
163 | return uinput_dev_event(dev, EV_FF, effect_id, value); | |
164 | } | |
165 | ||
166 | static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old) | |
1da177e4 | 167 | { |
05cebd38 | 168 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 | 169 | struct uinput_request request; |
0048e603 | 170 | int retval; |
1da177e4 | 171 | |
2d56f3a3 PL |
172 | /* |
173 | * uinput driver does not currently support periodic effects with | |
174 | * custom waveform since it does not have a way to pass buffer of | |
175 | * samples (custom_data) to userspace. If ever there is a device | |
176 | * supporting custom waveforms we would need to define an additional | |
177 | * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. | |
178 | */ | |
179 | if (effect->type == FF_PERIODIC && | |
180 | effect->u.periodic.waveform == FF_CUSTOM) | |
181 | return -EINVAL; | |
182 | ||
0048e603 DT |
183 | request.id = -1; |
184 | init_completion(&request.done); | |
185 | request.code = UI_FF_UPLOAD; | |
ff462551 AH |
186 | request.u.upload.effect = effect; |
187 | request.u.upload.old = old; | |
0048e603 | 188 | |
05cebd38 ASRF |
189 | retval = uinput_request_submit(udev, &request); |
190 | if (!retval) { | |
191 | wait_for_completion(&request.done); | |
192 | retval = request.retval; | |
193 | } | |
0048e603 DT |
194 | |
195 | return retval; | |
1da177e4 LT |
196 | } |
197 | ||
198 | static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) | |
199 | { | |
05cebd38 | 200 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 | 201 | struct uinput_request request; |
0048e603 | 202 | int retval; |
1da177e4 LT |
203 | |
204 | if (!test_bit(EV_FF, dev->evbit)) | |
205 | return -ENOSYS; | |
206 | ||
0048e603 DT |
207 | request.id = -1; |
208 | init_completion(&request.done); | |
209 | request.code = UI_FF_ERASE; | |
1da177e4 | 210 | request.u.effect_id = effect_id; |
0048e603 | 211 | |
05cebd38 ASRF |
212 | retval = uinput_request_submit(udev, &request); |
213 | if (!retval) { | |
214 | wait_for_completion(&request.done); | |
215 | retval = request.retval; | |
216 | } | |
0048e603 DT |
217 | |
218 | return retval; | |
1da177e4 LT |
219 | } |
220 | ||
29506415 | 221 | static void uinput_destroy_device(struct uinput_device *udev) |
1da177e4 | 222 | { |
29506415 | 223 | const char *name, *phys; |
05cebd38 ASRF |
224 | struct input_dev *dev = udev->dev; |
225 | enum uinput_state old_state = udev->state; | |
226 | ||
227 | udev->state = UIST_NEW_DEVICE; | |
29506415 | 228 | |
05cebd38 ASRF |
229 | if (dev) { |
230 | name = dev->name; | |
231 | phys = dev->phys; | |
232 | if (old_state == UIST_CREATED) { | |
233 | uinput_flush_requests(udev); | |
234 | input_unregister_device(dev); | |
235 | } else { | |
236 | input_free_device(dev); | |
237 | } | |
29506415 DT |
238 | kfree(name); |
239 | kfree(phys); | |
240 | udev->dev = NULL; | |
1da177e4 | 241 | } |
1da177e4 LT |
242 | } |
243 | ||
29506415 | 244 | static int uinput_create_device(struct uinput_device *udev) |
1da177e4 | 245 | { |
ff462551 | 246 | struct input_dev *dev = udev->dev; |
29506415 DT |
247 | int error; |
248 | ||
249 | if (udev->state != UIST_SETUP_COMPLETE) { | |
250 | printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); | |
1da177e4 LT |
251 | return -EINVAL; |
252 | } | |
253 | ||
ff462551 AH |
254 | if (udev->ff_effects_max) { |
255 | error = input_ff_create(dev, udev->ff_effects_max); | |
256 | if (error) | |
257 | goto fail1; | |
258 | ||
259 | dev->ff->upload = uinput_dev_upload_effect; | |
260 | dev->ff->erase = uinput_dev_erase_effect; | |
261 | dev->ff->playback = uinput_dev_playback; | |
262 | dev->ff->set_gain = uinput_dev_set_gain; | |
263 | dev->ff->set_autocenter = uinput_dev_set_autocenter; | |
29506415 | 264 | } |
1da177e4 | 265 | |
ff462551 AH |
266 | error = input_register_device(udev->dev); |
267 | if (error) | |
268 | goto fail2; | |
269 | ||
29506415 | 270 | udev->state = UIST_CREATED; |
1da177e4 LT |
271 | |
272 | return 0; | |
ff462551 AH |
273 | |
274 | fail2: input_ff_destroy(dev); | |
275 | fail1: uinput_destroy_device(udev); | |
276 | return error; | |
1da177e4 LT |
277 | } |
278 | ||
279 | static int uinput_open(struct inode *inode, struct file *file) | |
280 | { | |
29506415 | 281 | struct uinput_device *newdev; |
1da177e4 | 282 | |
29506415 | 283 | newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); |
1da177e4 | 284 | if (!newdev) |
29506415 DT |
285 | return -ENOMEM; |
286 | ||
87029658 | 287 | lock_kernel(); |
221979aa | 288 | mutex_init(&newdev->mutex); |
0048e603 | 289 | spin_lock_init(&newdev->requests_lock); |
1da177e4 | 290 | init_waitqueue_head(&newdev->requests_waitq); |
29506415 DT |
291 | init_waitqueue_head(&newdev->waitq); |
292 | newdev->state = UIST_NEW_DEVICE; | |
1da177e4 LT |
293 | |
294 | file->private_data = newdev; | |
87029658 | 295 | unlock_kernel(); |
1da177e4 LT |
296 | |
297 | return 0; | |
1da177e4 LT |
298 | } |
299 | ||
300 | static int uinput_validate_absbits(struct input_dev *dev) | |
301 | { | |
302 | unsigned int cnt; | |
303 | int retval = 0; | |
304 | ||
305 | for (cnt = 0; cnt < ABS_MAX + 1; cnt++) { | |
306 | if (!test_bit(cnt, dev->absbit)) | |
307 | continue; | |
308 | ||
309 | if ((dev->absmax[cnt] <= dev->absmin[cnt])) { | |
310 | printk(KERN_DEBUG | |
311 | "%s: invalid abs[%02x] min:%d max:%d\n", | |
312 | UINPUT_NAME, cnt, | |
313 | dev->absmin[cnt], dev->absmax[cnt]); | |
314 | retval = -EINVAL; | |
315 | break; | |
316 | } | |
317 | ||
318 | if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) { | |
319 | printk(KERN_DEBUG | |
320 | "%s: absflat[%02x] out of range: %d " | |
321 | "(min:%d/max:%d)\n", | |
322 | UINPUT_NAME, cnt, dev->absflat[cnt], | |
323 | dev->absmin[cnt], dev->absmax[cnt]); | |
324 | retval = -EINVAL; | |
325 | break; | |
326 | } | |
327 | } | |
328 | return retval; | |
329 | } | |
330 | ||
29506415 DT |
331 | static int uinput_allocate_device(struct uinput_device *udev) |
332 | { | |
333 | udev->dev = input_allocate_device(); | |
334 | if (!udev->dev) | |
335 | return -ENOMEM; | |
336 | ||
337 | udev->dev->event = uinput_dev_event; | |
373f9713 | 338 | input_set_drvdata(udev->dev, udev); |
29506415 DT |
339 | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count) | |
1da177e4 LT |
344 | { |
345 | struct uinput_user_dev *user_dev; | |
346 | struct input_dev *dev; | |
5b6271bd | 347 | char *name; |
152c12f5 DT |
348 | int size; |
349 | int retval; | |
1da177e4 | 350 | |
29506415 DT |
351 | if (count != sizeof(struct uinput_user_dev)) |
352 | return -EINVAL; | |
353 | ||
354 | if (!udev->dev) { | |
355 | retval = uinput_allocate_device(udev); | |
356 | if (retval) | |
357 | return retval; | |
358 | } | |
1da177e4 | 359 | |
1da177e4 LT |
360 | dev = udev->dev; |
361 | ||
152c12f5 | 362 | user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL); |
29506415 DT |
363 | if (!user_dev) |
364 | return -ENOMEM; | |
1da177e4 LT |
365 | |
366 | if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) { | |
367 | retval = -EFAULT; | |
368 | goto exit; | |
369 | } | |
370 | ||
ff462551 AH |
371 | udev->ff_effects_max = user_dev->ff_effects_max; |
372 | ||
1da177e4 | 373 | size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1; |
29506415 DT |
374 | if (!size) { |
375 | retval = -EINVAL; | |
376 | goto exit; | |
377 | } | |
378 | ||
379 | kfree(dev->name); | |
5b6271bd DT |
380 | dev->name = name = kmalloc(size, GFP_KERNEL); |
381 | if (!name) { | |
1da177e4 LT |
382 | retval = -ENOMEM; |
383 | goto exit; | |
384 | } | |
5b6271bd | 385 | strlcpy(name, user_dev->name, size); |
1da177e4 | 386 | |
1da177e4 LT |
387 | dev->id.bustype = user_dev->id.bustype; |
388 | dev->id.vendor = user_dev->id.vendor; | |
389 | dev->id.product = user_dev->id.product; | |
390 | dev->id.version = user_dev->id.version; | |
1da177e4 LT |
391 | |
392 | size = sizeof(int) * (ABS_MAX + 1); | |
393 | memcpy(dev->absmax, user_dev->absmax, size); | |
394 | memcpy(dev->absmin, user_dev->absmin, size); | |
395 | memcpy(dev->absfuzz, user_dev->absfuzz, size); | |
396 | memcpy(dev->absflat, user_dev->absflat, size); | |
397 | ||
398 | /* check if absmin/absmax/absfuzz/absflat are filled as | |
399 | * told in Documentation/input/input-programming.txt */ | |
400 | if (test_bit(EV_ABS, dev->evbit)) { | |
29506415 DT |
401 | retval = uinput_validate_absbits(dev); |
402 | if (retval < 0) | |
403 | goto exit; | |
1da177e4 LT |
404 | } |
405 | ||
29506415 DT |
406 | udev->state = UIST_SETUP_COMPLETE; |
407 | retval = count; | |
408 | ||
409 | exit: | |
1da177e4 LT |
410 | kfree(user_dev); |
411 | return retval; | |
412 | } | |
413 | ||
29506415 DT |
414 | static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count) |
415 | { | |
416 | struct input_event ev; | |
417 | ||
2d56f3a3 | 418 | if (count < input_event_size()) |
29506415 DT |
419 | return -EINVAL; |
420 | ||
2d56f3a3 | 421 | if (input_event_from_user(buffer, &ev)) |
29506415 DT |
422 | return -EFAULT; |
423 | ||
424 | input_event(udev->dev, ev.type, ev.code, ev.value); | |
425 | ||
2d56f3a3 | 426 | return input_event_size(); |
29506415 DT |
427 | } |
428 | ||
1da177e4 LT |
429 | static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
430 | { | |
431 | struct uinput_device *udev = file->private_data; | |
29506415 | 432 | int retval; |
1da177e4 | 433 | |
221979aa | 434 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
435 | if (retval) |
436 | return retval; | |
437 | ||
438 | retval = udev->state == UIST_CREATED ? | |
439 | uinput_inject_event(udev, buffer, count) : | |
440 | uinput_setup_device(udev, buffer, count); | |
1da177e4 | 441 | |
221979aa | 442 | mutex_unlock(&udev->mutex); |
1da177e4 | 443 | |
29506415 | 444 | return retval; |
1da177e4 LT |
445 | } |
446 | ||
447 | static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
448 | { | |
449 | struct uinput_device *udev = file->private_data; | |
450 | int retval = 0; | |
451 | ||
29506415 | 452 | if (udev->state != UIST_CREATED) |
1da177e4 LT |
453 | return -ENODEV; |
454 | ||
152c12f5 | 455 | if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK)) |
1da177e4 LT |
456 | return -EAGAIN; |
457 | ||
458 | retval = wait_event_interruptible(udev->waitq, | |
29506415 | 459 | udev->head != udev->tail || udev->state != UIST_CREATED); |
1da177e4 LT |
460 | if (retval) |
461 | return retval; | |
462 | ||
221979aa | 463 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
464 | if (retval) |
465 | return retval; | |
466 | ||
467 | if (udev->state != UIST_CREATED) { | |
468 | retval = -ENODEV; | |
469 | goto out; | |
470 | } | |
1da177e4 | 471 | |
2d56f3a3 PL |
472 | while (udev->head != udev->tail && retval + input_event_size() <= count) { |
473 | if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) { | |
29506415 DT |
474 | retval = -EFAULT; |
475 | goto out; | |
476 | } | |
1da177e4 | 477 | udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; |
2d56f3a3 | 478 | retval += input_event_size(); |
1da177e4 LT |
479 | } |
480 | ||
29506415 | 481 | out: |
221979aa | 482 | mutex_unlock(&udev->mutex); |
29506415 | 483 | |
1da177e4 LT |
484 | return retval; |
485 | } | |
486 | ||
487 | static unsigned int uinput_poll(struct file *file, poll_table *wait) | |
488 | { | |
489 | struct uinput_device *udev = file->private_data; | |
490 | ||
491 | poll_wait(file, &udev->waitq, wait); | |
492 | ||
493 | if (udev->head != udev->tail) | |
494 | return POLLIN | POLLRDNORM; | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
29506415 | 499 | static int uinput_release(struct inode *inode, struct file *file) |
1da177e4 | 500 | { |
29506415 | 501 | struct uinput_device *udev = file->private_data; |
1da177e4 | 502 | |
29506415 | 503 | uinput_destroy_device(udev); |
1da177e4 LT |
504 | kfree(udev); |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
2d56f3a3 PL |
509 | #ifdef CONFIG_COMPAT |
510 | struct uinput_ff_upload_compat { | |
511 | int request_id; | |
512 | int retval; | |
513 | struct ff_effect_compat effect; | |
514 | struct ff_effect_compat old; | |
515 | }; | |
516 | ||
517 | static int uinput_ff_upload_to_user(char __user *buffer, | |
518 | const struct uinput_ff_upload *ff_up) | |
519 | { | |
520 | if (INPUT_COMPAT_TEST) { | |
521 | struct uinput_ff_upload_compat ff_up_compat; | |
522 | ||
523 | ff_up_compat.request_id = ff_up->request_id; | |
524 | ff_up_compat.retval = ff_up->retval; | |
525 | /* | |
526 | * It so happens that the pointer that gives us the trouble | |
527 | * is the last field in the structure. Since we don't support | |
528 | * custom waveforms in uinput anyway we can just copy the whole | |
529 | * thing (to the compat size) and ignore the pointer. | |
530 | */ | |
531 | memcpy(&ff_up_compat.effect, &ff_up->effect, | |
532 | sizeof(struct ff_effect_compat)); | |
533 | memcpy(&ff_up_compat.old, &ff_up->old, | |
534 | sizeof(struct ff_effect_compat)); | |
535 | ||
536 | if (copy_to_user(buffer, &ff_up_compat, | |
537 | sizeof(struct uinput_ff_upload_compat))) | |
538 | return -EFAULT; | |
539 | } else { | |
540 | if (copy_to_user(buffer, ff_up, | |
541 | sizeof(struct uinput_ff_upload))) | |
542 | return -EFAULT; | |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
549 | struct uinput_ff_upload *ff_up) | |
550 | { | |
551 | if (INPUT_COMPAT_TEST) { | |
552 | struct uinput_ff_upload_compat ff_up_compat; | |
553 | ||
554 | if (copy_from_user(&ff_up_compat, buffer, | |
555 | sizeof(struct uinput_ff_upload_compat))) | |
556 | return -EFAULT; | |
557 | ||
558 | ff_up->request_id = ff_up_compat.request_id; | |
559 | ff_up->retval = ff_up_compat.retval; | |
560 | memcpy(&ff_up->effect, &ff_up_compat.effect, | |
561 | sizeof(struct ff_effect_compat)); | |
562 | memcpy(&ff_up->old, &ff_up_compat.old, | |
563 | sizeof(struct ff_effect_compat)); | |
564 | ||
565 | } else { | |
566 | if (copy_from_user(ff_up, buffer, | |
567 | sizeof(struct uinput_ff_upload))) | |
568 | return -EFAULT; | |
569 | } | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | #else | |
575 | ||
576 | static int uinput_ff_upload_to_user(char __user *buffer, | |
577 | const struct uinput_ff_upload *ff_up) | |
578 | { | |
579 | if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) | |
580 | return -EFAULT; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
586 | struct uinput_ff_upload *ff_up) | |
587 | { | |
588 | if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) | |
589 | return -EFAULT; | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | #endif | |
595 | ||
29506415 DT |
596 | #define uinput_set_bit(_arg, _bit, _max) \ |
597 | ({ \ | |
598 | int __ret = 0; \ | |
599 | if (udev->state == UIST_CREATED) \ | |
600 | __ret = -EINVAL; \ | |
601 | else if ((_arg) > (_max)) \ | |
602 | __ret = -EINVAL; \ | |
603 | else set_bit((_arg), udev->dev->_bit); \ | |
604 | __ret; \ | |
605 | }) | |
606 | ||
2d56f3a3 PL |
607 | static long uinput_ioctl_handler(struct file *file, unsigned int cmd, |
608 | unsigned long arg, void __user *p) | |
1da177e4 | 609 | { |
29506415 | 610 | int retval; |
2d56f3a3 | 611 | struct uinput_device *udev = file->private_data; |
1da177e4 LT |
612 | struct uinput_ff_upload ff_up; |
613 | struct uinput_ff_erase ff_erase; | |
614 | struct uinput_request *req; | |
615 | int length; | |
5b6271bd | 616 | char *phys; |
1da177e4 | 617 | |
221979aa | 618 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
619 | if (retval) |
620 | return retval; | |
621 | ||
622 | if (!udev->dev) { | |
623 | retval = uinput_allocate_device(udev); | |
624 | if (retval) | |
625 | goto out; | |
1da177e4 LT |
626 | } |
627 | ||
628 | switch (cmd) { | |
629 | case UI_DEV_CREATE: | |
630 | retval = uinput_create_device(udev); | |
631 | break; | |
632 | ||
633 | case UI_DEV_DESTROY: | |
29506415 | 634 | uinput_destroy_device(udev); |
1da177e4 LT |
635 | break; |
636 | ||
637 | case UI_SET_EVBIT: | |
29506415 | 638 | retval = uinput_set_bit(arg, evbit, EV_MAX); |
1da177e4 LT |
639 | break; |
640 | ||
641 | case UI_SET_KEYBIT: | |
29506415 | 642 | retval = uinput_set_bit(arg, keybit, KEY_MAX); |
1da177e4 LT |
643 | break; |
644 | ||
645 | case UI_SET_RELBIT: | |
29506415 | 646 | retval = uinput_set_bit(arg, relbit, REL_MAX); |
1da177e4 LT |
647 | break; |
648 | ||
649 | case UI_SET_ABSBIT: | |
29506415 | 650 | retval = uinput_set_bit(arg, absbit, ABS_MAX); |
1da177e4 LT |
651 | break; |
652 | ||
653 | case UI_SET_MSCBIT: | |
29506415 | 654 | retval = uinput_set_bit(arg, mscbit, MSC_MAX); |
1da177e4 LT |
655 | break; |
656 | ||
657 | case UI_SET_LEDBIT: | |
29506415 | 658 | retval = uinput_set_bit(arg, ledbit, LED_MAX); |
1da177e4 LT |
659 | break; |
660 | ||
661 | case UI_SET_SNDBIT: | |
29506415 | 662 | retval = uinput_set_bit(arg, sndbit, SND_MAX); |
1da177e4 LT |
663 | break; |
664 | ||
665 | case UI_SET_FFBIT: | |
29506415 | 666 | retval = uinput_set_bit(arg, ffbit, FF_MAX); |
1da177e4 LT |
667 | break; |
668 | ||
59c7c037 DT |
669 | case UI_SET_SWBIT: |
670 | retval = uinput_set_bit(arg, swbit, SW_MAX); | |
671 | break; | |
672 | ||
1da177e4 | 673 | case UI_SET_PHYS: |
29506415 DT |
674 | if (udev->state == UIST_CREATED) { |
675 | retval = -EINVAL; | |
676 | goto out; | |
677 | } | |
1da177e4 LT |
678 | length = strnlen_user(p, 1024); |
679 | if (length <= 0) { | |
680 | retval = -EFAULT; | |
681 | break; | |
682 | } | |
5b6271bd DT |
683 | kfree(udev->dev->phys); |
684 | udev->dev->phys = phys = kmalloc(length, GFP_KERNEL); | |
685 | if (!phys) { | |
1da177e4 LT |
686 | retval = -ENOMEM; |
687 | break; | |
688 | } | |
5b6271bd | 689 | if (copy_from_user(phys, p, length)) { |
1da177e4 | 690 | udev->dev->phys = NULL; |
5b6271bd DT |
691 | kfree(phys); |
692 | retval = -EFAULT; | |
1da177e4 LT |
693 | break; |
694 | } | |
5b6271bd | 695 | phys[length - 1] = '\0'; |
1da177e4 LT |
696 | break; |
697 | ||
698 | case UI_BEGIN_FF_UPLOAD: | |
2d56f3a3 PL |
699 | retval = uinput_ff_upload_from_user(p, &ff_up); |
700 | if (retval) | |
1da177e4 | 701 | break; |
2d56f3a3 | 702 | |
1da177e4 | 703 | req = uinput_request_find(udev, ff_up.request_id); |
2d56f3a3 | 704 | if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) { |
1da177e4 LT |
705 | retval = -EINVAL; |
706 | break; | |
707 | } | |
2d56f3a3 | 708 | |
1da177e4 | 709 | ff_up.retval = 0; |
2d56f3a3 | 710 | ff_up.effect = *req->u.upload.effect; |
ff462551 | 711 | if (req->u.upload.old) |
2d56f3a3 | 712 | ff_up.old = *req->u.upload.old; |
ff462551 AH |
713 | else |
714 | memset(&ff_up.old, 0, sizeof(struct ff_effect)); | |
715 | ||
2d56f3a3 | 716 | retval = uinput_ff_upload_to_user(p, &ff_up); |
1da177e4 LT |
717 | break; |
718 | ||
719 | case UI_BEGIN_FF_ERASE: | |
720 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
721 | retval = -EFAULT; | |
722 | break; | |
723 | } | |
2d56f3a3 | 724 | |
1da177e4 | 725 | req = uinput_request_find(udev, ff_erase.request_id); |
2d56f3a3 | 726 | if (!req || req->code != UI_FF_ERASE) { |
1da177e4 LT |
727 | retval = -EINVAL; |
728 | break; | |
729 | } | |
2d56f3a3 | 730 | |
1da177e4 LT |
731 | ff_erase.retval = 0; |
732 | ff_erase.effect_id = req->u.effect_id; | |
733 | if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { | |
734 | retval = -EFAULT; | |
735 | break; | |
736 | } | |
2d56f3a3 | 737 | |
1da177e4 LT |
738 | break; |
739 | ||
740 | case UI_END_FF_UPLOAD: | |
2d56f3a3 PL |
741 | retval = uinput_ff_upload_from_user(p, &ff_up); |
742 | if (retval) | |
1da177e4 | 743 | break; |
2d56f3a3 | 744 | |
1da177e4 | 745 | req = uinput_request_find(udev, ff_up.request_id); |
2d56f3a3 PL |
746 | if (!req || req->code != UI_FF_UPLOAD || |
747 | !req->u.upload.effect) { | |
1da177e4 LT |
748 | retval = -EINVAL; |
749 | break; | |
750 | } | |
2d56f3a3 | 751 | |
1da177e4 | 752 | req->retval = ff_up.retval; |
0048e603 | 753 | uinput_request_done(udev, req); |
1da177e4 LT |
754 | break; |
755 | ||
756 | case UI_END_FF_ERASE: | |
757 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
758 | retval = -EFAULT; | |
759 | break; | |
760 | } | |
2d56f3a3 | 761 | |
1da177e4 | 762 | req = uinput_request_find(udev, ff_erase.request_id); |
2d56f3a3 | 763 | if (!req || req->code != UI_FF_ERASE) { |
1da177e4 LT |
764 | retval = -EINVAL; |
765 | break; | |
766 | } | |
2d56f3a3 | 767 | |
1da177e4 | 768 | req->retval = ff_erase.retval; |
0048e603 | 769 | uinput_request_done(udev, req); |
1da177e4 LT |
770 | break; |
771 | ||
772 | default: | |
773 | retval = -EINVAL; | |
774 | } | |
29506415 DT |
775 | |
776 | out: | |
221979aa | 777 | mutex_unlock(&udev->mutex); |
1da177e4 LT |
778 | return retval; |
779 | } | |
780 | ||
2d56f3a3 PL |
781 | static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
782 | { | |
783 | return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); | |
784 | } | |
785 | ||
786 | #ifdef CONFIG_COMPAT | |
787 | static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
788 | { | |
789 | return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); | |
790 | } | |
791 | #endif | |
792 | ||
2b8693c0 | 793 | static const struct file_operations uinput_fops = { |
29506415 DT |
794 | .owner = THIS_MODULE, |
795 | .open = uinput_open, | |
796 | .release = uinput_release, | |
797 | .read = uinput_read, | |
798 | .write = uinput_write, | |
799 | .poll = uinput_poll, | |
800 | .unlocked_ioctl = uinput_ioctl, | |
2d56f3a3 PL |
801 | #ifdef CONFIG_COMPAT |
802 | .compat_ioctl = uinput_compat_ioctl, | |
803 | #endif | |
1da177e4 LT |
804 | }; |
805 | ||
806 | static struct miscdevice uinput_misc = { | |
29506415 DT |
807 | .fops = &uinput_fops, |
808 | .minor = UINPUT_MINOR, | |
809 | .name = UINPUT_NAME, | |
1da177e4 LT |
810 | }; |
811 | ||
812 | static int __init uinput_init(void) | |
813 | { | |
814 | return misc_register(&uinput_misc); | |
815 | } | |
816 | ||
817 | static void __exit uinput_exit(void) | |
818 | { | |
819 | misc_deregister(&uinput_misc); | |
820 | } | |
821 | ||
822 | MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); | |
823 | MODULE_DESCRIPTION("User level driver support for input subsystem"); | |
824 | MODULE_LICENSE("GPL"); | |
ff462551 | 825 | MODULE_VERSION("0.3"); |
1da177e4 LT |
826 | |
827 | module_init(uinput_init); | |
828 | module_exit(uinput_exit); | |
829 |