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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/fs.h> |
38 | #include <linux/miscdevice.h> | |
39 | #include <linux/uinput.h> | |
2d56f3a3 | 40 | #include "../input-compat.h" |
1da177e4 | 41 | |
1da177e4 LT |
42 | static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) |
43 | { | |
373f9713 | 44 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 LT |
45 | |
46 | udev->buff[udev->head].type = type; | |
47 | udev->buff[udev->head].code = code; | |
48 | udev->buff[udev->head].value = value; | |
49 | do_gettimeofday(&udev->buff[udev->head].time); | |
50 | udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE; | |
51 | ||
52 | wake_up_interruptible(&udev->waitq); | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
05cebd38 | 57 | /* Atomically allocate an ID for the given request. Returns 0 on success. */ |
0048e603 | 58 | static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request) |
1da177e4 | 59 | { |
1da177e4 | 60 | int id; |
152c12f5 | 61 | int err = -1; |
1da177e4 | 62 | |
0048e603 | 63 | spin_lock(&udev->requests_lock); |
152c12f5 | 64 | |
05cebd38 | 65 | for (id = 0; id < UINPUT_NUM_REQUESTS; id++) { |
1da177e4 | 66 | if (!udev->requests[id]) { |
1da177e4 | 67 | request->id = id; |
0048e603 | 68 | udev->requests[id] = request; |
152c12f5 DT |
69 | err = 0; |
70 | break; | |
1da177e4 | 71 | } |
05cebd38 | 72 | } |
152c12f5 | 73 | |
0048e603 | 74 | spin_unlock(&udev->requests_lock); |
152c12f5 | 75 | return err; |
1da177e4 LT |
76 | } |
77 | ||
05cebd38 | 78 | static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id) |
1da177e4 LT |
79 | { |
80 | /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ | |
81 | if (id >= UINPUT_NUM_REQUESTS || id < 0) | |
82 | return NULL; | |
2d56f3a3 | 83 | |
1da177e4 LT |
84 | return udev->requests[id]; |
85 | } | |
86 | ||
0048e603 | 87 | static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request) |
1da177e4 | 88 | { |
0048e603 DT |
89 | /* Allocate slot. If none are available right away, wait. */ |
90 | return wait_event_interruptible(udev->requests_waitq, | |
91 | !uinput_request_alloc_id(udev, request)); | |
92 | } | |
1da177e4 | 93 | |
0048e603 DT |
94 | static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request) |
95 | { | |
0048e603 DT |
96 | /* Mark slot as available */ |
97 | udev->requests[request->id] = NULL; | |
e597f0c8 | 98 | wake_up(&udev->requests_waitq); |
e7507ed9 DT |
99 | |
100 | complete(&request->done); | |
1da177e4 LT |
101 | } |
102 | ||
05cebd38 | 103 | static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request) |
1da177e4 | 104 | { |
05cebd38 ASRF |
105 | int retval; |
106 | ||
107 | retval = uinput_request_reserve_slot(udev, request); | |
108 | if (retval) | |
109 | return retval; | |
110 | ||
111 | retval = mutex_lock_interruptible(&udev->mutex); | |
112 | if (retval) | |
113 | return retval; | |
114 | ||
115 | if (udev->state != UIST_CREATED) { | |
116 | retval = -ENODEV; | |
117 | goto out; | |
118 | } | |
119 | ||
1da177e4 | 120 | /* Tell our userspace app about this new request by queueing an input event */ |
05cebd38 ASRF |
121 | uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id); |
122 | ||
123 | out: | |
124 | mutex_unlock(&udev->mutex); | |
125 | return retval; | |
126 | } | |
127 | ||
128 | /* | |
129 | * Fail all ouitstanding requests so handlers don't wait for the userspace | |
130 | * to finish processing them. | |
131 | */ | |
132 | static void uinput_flush_requests(struct uinput_device *udev) | |
133 | { | |
134 | struct uinput_request *request; | |
135 | int i; | |
1da177e4 | 136 | |
05cebd38 ASRF |
137 | spin_lock(&udev->requests_lock); |
138 | ||
139 | for (i = 0; i < UINPUT_NUM_REQUESTS; i++) { | |
140 | request = udev->requests[i]; | |
141 | if (request) { | |
142 | request->retval = -ENODEV; | |
143 | uinput_request_done(udev, request); | |
144 | } | |
145 | } | |
146 | ||
147 | spin_unlock(&udev->requests_lock); | |
1da177e4 LT |
148 | } |
149 | ||
ff462551 AH |
150 | static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) |
151 | { | |
152 | uinput_dev_event(dev, EV_FF, FF_GAIN, gain); | |
153 | } | |
154 | ||
155 | static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) | |
156 | { | |
157 | uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude); | |
158 | } | |
159 | ||
160 | static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) | |
161 | { | |
162 | return uinput_dev_event(dev, EV_FF, effect_id, value); | |
163 | } | |
164 | ||
165 | static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old) | |
1da177e4 | 166 | { |
05cebd38 | 167 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 | 168 | struct uinput_request request; |
0048e603 | 169 | int retval; |
1da177e4 | 170 | |
2d56f3a3 PL |
171 | /* |
172 | * uinput driver does not currently support periodic effects with | |
173 | * custom waveform since it does not have a way to pass buffer of | |
174 | * samples (custom_data) to userspace. If ever there is a device | |
175 | * supporting custom waveforms we would need to define an additional | |
176 | * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. | |
177 | */ | |
178 | if (effect->type == FF_PERIODIC && | |
179 | effect->u.periodic.waveform == FF_CUSTOM) | |
180 | return -EINVAL; | |
181 | ||
0048e603 DT |
182 | request.id = -1; |
183 | init_completion(&request.done); | |
184 | request.code = UI_FF_UPLOAD; | |
ff462551 AH |
185 | request.u.upload.effect = effect; |
186 | request.u.upload.old = old; | |
0048e603 | 187 | |
05cebd38 ASRF |
188 | retval = uinput_request_submit(udev, &request); |
189 | if (!retval) { | |
190 | wait_for_completion(&request.done); | |
191 | retval = request.retval; | |
192 | } | |
0048e603 DT |
193 | |
194 | return retval; | |
1da177e4 LT |
195 | } |
196 | ||
197 | static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) | |
198 | { | |
05cebd38 | 199 | struct uinput_device *udev = input_get_drvdata(dev); |
1da177e4 | 200 | struct uinput_request request; |
0048e603 | 201 | int retval; |
1da177e4 LT |
202 | |
203 | if (!test_bit(EV_FF, dev->evbit)) | |
204 | return -ENOSYS; | |
205 | ||
0048e603 DT |
206 | request.id = -1; |
207 | init_completion(&request.done); | |
208 | request.code = UI_FF_ERASE; | |
1da177e4 | 209 | request.u.effect_id = effect_id; |
0048e603 | 210 | |
05cebd38 ASRF |
211 | retval = uinput_request_submit(udev, &request); |
212 | if (!retval) { | |
213 | wait_for_completion(&request.done); | |
214 | retval = request.retval; | |
215 | } | |
0048e603 DT |
216 | |
217 | return retval; | |
1da177e4 LT |
218 | } |
219 | ||
29506415 | 220 | static void uinput_destroy_device(struct uinput_device *udev) |
1da177e4 | 221 | { |
29506415 | 222 | const char *name, *phys; |
05cebd38 ASRF |
223 | struct input_dev *dev = udev->dev; |
224 | enum uinput_state old_state = udev->state; | |
225 | ||
226 | udev->state = UIST_NEW_DEVICE; | |
29506415 | 227 | |
05cebd38 ASRF |
228 | if (dev) { |
229 | name = dev->name; | |
230 | phys = dev->phys; | |
231 | if (old_state == UIST_CREATED) { | |
232 | uinput_flush_requests(udev); | |
233 | input_unregister_device(dev); | |
234 | } else { | |
235 | input_free_device(dev); | |
236 | } | |
29506415 DT |
237 | kfree(name); |
238 | kfree(phys); | |
239 | udev->dev = NULL; | |
1da177e4 | 240 | } |
1da177e4 LT |
241 | } |
242 | ||
29506415 | 243 | static int uinput_create_device(struct uinput_device *udev) |
1da177e4 | 244 | { |
ff462551 | 245 | struct input_dev *dev = udev->dev; |
29506415 DT |
246 | int error; |
247 | ||
248 | if (udev->state != UIST_SETUP_COMPLETE) { | |
249 | printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME); | |
1da177e4 LT |
250 | return -EINVAL; |
251 | } | |
252 | ||
ff462551 AH |
253 | if (udev->ff_effects_max) { |
254 | error = input_ff_create(dev, udev->ff_effects_max); | |
255 | if (error) | |
256 | goto fail1; | |
257 | ||
258 | dev->ff->upload = uinput_dev_upload_effect; | |
259 | dev->ff->erase = uinput_dev_erase_effect; | |
260 | dev->ff->playback = uinput_dev_playback; | |
261 | dev->ff->set_gain = uinput_dev_set_gain; | |
262 | dev->ff->set_autocenter = uinput_dev_set_autocenter; | |
29506415 | 263 | } |
1da177e4 | 264 | |
ff462551 AH |
265 | error = input_register_device(udev->dev); |
266 | if (error) | |
267 | goto fail2; | |
268 | ||
29506415 | 269 | udev->state = UIST_CREATED; |
1da177e4 LT |
270 | |
271 | return 0; | |
ff462551 AH |
272 | |
273 | fail2: input_ff_destroy(dev); | |
274 | fail1: uinput_destroy_device(udev); | |
275 | return error; | |
1da177e4 LT |
276 | } |
277 | ||
278 | static int uinput_open(struct inode *inode, struct file *file) | |
279 | { | |
29506415 | 280 | struct uinput_device *newdev; |
1da177e4 | 281 | |
29506415 | 282 | newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL); |
1da177e4 | 283 | if (!newdev) |
29506415 DT |
284 | return -ENOMEM; |
285 | ||
221979aa | 286 | mutex_init(&newdev->mutex); |
0048e603 | 287 | spin_lock_init(&newdev->requests_lock); |
1da177e4 | 288 | init_waitqueue_head(&newdev->requests_waitq); |
29506415 DT |
289 | init_waitqueue_head(&newdev->waitq); |
290 | newdev->state = UIST_NEW_DEVICE; | |
1da177e4 LT |
291 | |
292 | file->private_data = newdev; | |
daf8a96b | 293 | nonseekable_open(inode, file); |
1da177e4 LT |
294 | |
295 | return 0; | |
1da177e4 LT |
296 | } |
297 | ||
298 | static int uinput_validate_absbits(struct input_dev *dev) | |
299 | { | |
300 | unsigned int cnt; | |
301 | int retval = 0; | |
302 | ||
81c2a3ba | 303 | for (cnt = 0; cnt < ABS_CNT; cnt++) { |
1da177e4 LT |
304 | if (!test_bit(cnt, dev->absbit)) |
305 | continue; | |
306 | ||
987a6c02 | 307 | if (input_abs_get_max(dev, cnt) <= input_abs_get_min(dev, cnt)) { |
1da177e4 LT |
308 | printk(KERN_DEBUG |
309 | "%s: invalid abs[%02x] min:%d max:%d\n", | |
310 | UINPUT_NAME, cnt, | |
987a6c02 DM |
311 | input_abs_get_min(dev, cnt), |
312 | input_abs_get_max(dev, cnt)); | |
1da177e4 LT |
313 | retval = -EINVAL; |
314 | break; | |
315 | } | |
316 | ||
987a6c02 DM |
317 | if (input_abs_get_flat(dev, cnt) > |
318 | input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) { | |
1da177e4 | 319 | printk(KERN_DEBUG |
987a6c02 | 320 | "%s: abs_flat #%02x out of range: %d " |
1da177e4 | 321 | "(min:%d/max:%d)\n", |
987a6c02 DM |
322 | UINPUT_NAME, cnt, |
323 | input_abs_get_flat(dev, cnt), | |
324 | input_abs_get_min(dev, cnt), | |
325 | input_abs_get_max(dev, cnt)); | |
1da177e4 LT |
326 | retval = -EINVAL; |
327 | break; | |
328 | } | |
329 | } | |
330 | return retval; | |
331 | } | |
332 | ||
29506415 DT |
333 | static int uinput_allocate_device(struct uinput_device *udev) |
334 | { | |
335 | udev->dev = input_allocate_device(); | |
336 | if (!udev->dev) | |
337 | return -ENOMEM; | |
338 | ||
339 | udev->dev->event = uinput_dev_event; | |
373f9713 | 340 | input_set_drvdata(udev->dev, udev); |
29506415 DT |
341 | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count) | |
1da177e4 LT |
346 | { |
347 | struct uinput_user_dev *user_dev; | |
348 | struct input_dev *dev; | |
5b6271bd | 349 | char *name; |
987a6c02 | 350 | int i, size; |
152c12f5 | 351 | int retval; |
1da177e4 | 352 | |
29506415 DT |
353 | if (count != sizeof(struct uinput_user_dev)) |
354 | return -EINVAL; | |
355 | ||
356 | if (!udev->dev) { | |
357 | retval = uinput_allocate_device(udev); | |
358 | if (retval) | |
359 | return retval; | |
360 | } | |
1da177e4 | 361 | |
1da177e4 LT |
362 | dev = udev->dev; |
363 | ||
152c12f5 | 364 | user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL); |
29506415 DT |
365 | if (!user_dev) |
366 | return -ENOMEM; | |
1da177e4 LT |
367 | |
368 | if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) { | |
369 | retval = -EFAULT; | |
370 | goto exit; | |
371 | } | |
372 | ||
ff462551 AH |
373 | udev->ff_effects_max = user_dev->ff_effects_max; |
374 | ||
1da177e4 | 375 | size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1; |
29506415 DT |
376 | if (!size) { |
377 | retval = -EINVAL; | |
378 | goto exit; | |
379 | } | |
380 | ||
381 | kfree(dev->name); | |
5b6271bd DT |
382 | dev->name = name = kmalloc(size, GFP_KERNEL); |
383 | if (!name) { | |
1da177e4 LT |
384 | retval = -ENOMEM; |
385 | goto exit; | |
386 | } | |
5b6271bd | 387 | strlcpy(name, user_dev->name, size); |
1da177e4 | 388 | |
1da177e4 LT |
389 | dev->id.bustype = user_dev->id.bustype; |
390 | dev->id.vendor = user_dev->id.vendor; | |
391 | dev->id.product = user_dev->id.product; | |
392 | dev->id.version = user_dev->id.version; | |
1da177e4 | 393 | |
987a6c02 DM |
394 | for (i = 0; i < ABS_CNT; i++) { |
395 | input_abs_set_max(dev, i, user_dev->absmax[i]); | |
396 | input_abs_set_min(dev, i, user_dev->absmin[i]); | |
397 | input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]); | |
398 | input_abs_set_flat(dev, i, user_dev->absflat[i]); | |
399 | } | |
1da177e4 LT |
400 | |
401 | /* check if absmin/absmax/absfuzz/absflat are filled as | |
402 | * told in Documentation/input/input-programming.txt */ | |
403 | if (test_bit(EV_ABS, dev->evbit)) { | |
29506415 DT |
404 | retval = uinput_validate_absbits(dev); |
405 | if (retval < 0) | |
406 | goto exit; | |
38e7afe9 HR |
407 | if (test_bit(ABS_MT_SLOT, dev->absbit)) { |
408 | int nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; | |
409 | input_mt_create_slots(dev, nslot); | |
410 | input_set_events_per_packet(dev, 6 * nslot); | |
411 | } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { | |
412 | input_set_events_per_packet(dev, 60); | |
413 | } | |
1da177e4 LT |
414 | } |
415 | ||
29506415 DT |
416 | udev->state = UIST_SETUP_COMPLETE; |
417 | retval = count; | |
418 | ||
419 | exit: | |
1da177e4 LT |
420 | kfree(user_dev); |
421 | return retval; | |
422 | } | |
423 | ||
29506415 DT |
424 | static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count) |
425 | { | |
426 | struct input_event ev; | |
427 | ||
2d56f3a3 | 428 | if (count < input_event_size()) |
29506415 DT |
429 | return -EINVAL; |
430 | ||
2d56f3a3 | 431 | if (input_event_from_user(buffer, &ev)) |
29506415 DT |
432 | return -EFAULT; |
433 | ||
434 | input_event(udev->dev, ev.type, ev.code, ev.value); | |
435 | ||
2d56f3a3 | 436 | return input_event_size(); |
29506415 DT |
437 | } |
438 | ||
1da177e4 LT |
439 | static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
440 | { | |
441 | struct uinput_device *udev = file->private_data; | |
29506415 | 442 | int retval; |
1da177e4 | 443 | |
221979aa | 444 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
445 | if (retval) |
446 | return retval; | |
447 | ||
448 | retval = udev->state == UIST_CREATED ? | |
449 | uinput_inject_event(udev, buffer, count) : | |
450 | uinput_setup_device(udev, buffer, count); | |
1da177e4 | 451 | |
221979aa | 452 | mutex_unlock(&udev->mutex); |
1da177e4 | 453 | |
29506415 | 454 | return retval; |
1da177e4 LT |
455 | } |
456 | ||
457 | static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
458 | { | |
459 | struct uinput_device *udev = file->private_data; | |
460 | int retval = 0; | |
461 | ||
29506415 | 462 | if (udev->state != UIST_CREATED) |
1da177e4 LT |
463 | return -ENODEV; |
464 | ||
152c12f5 | 465 | if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK)) |
1da177e4 LT |
466 | return -EAGAIN; |
467 | ||
468 | retval = wait_event_interruptible(udev->waitq, | |
29506415 | 469 | udev->head != udev->tail || udev->state != UIST_CREATED); |
1da177e4 LT |
470 | if (retval) |
471 | return retval; | |
472 | ||
221979aa | 473 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
474 | if (retval) |
475 | return retval; | |
476 | ||
477 | if (udev->state != UIST_CREATED) { | |
478 | retval = -ENODEV; | |
479 | goto out; | |
480 | } | |
1da177e4 | 481 | |
2d56f3a3 PL |
482 | while (udev->head != udev->tail && retval + input_event_size() <= count) { |
483 | if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) { | |
29506415 DT |
484 | retval = -EFAULT; |
485 | goto out; | |
486 | } | |
1da177e4 | 487 | udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; |
2d56f3a3 | 488 | retval += input_event_size(); |
1da177e4 LT |
489 | } |
490 | ||
29506415 | 491 | out: |
221979aa | 492 | mutex_unlock(&udev->mutex); |
29506415 | 493 | |
1da177e4 LT |
494 | return retval; |
495 | } | |
496 | ||
497 | static unsigned int uinput_poll(struct file *file, poll_table *wait) | |
498 | { | |
499 | struct uinput_device *udev = file->private_data; | |
500 | ||
501 | poll_wait(file, &udev->waitq, wait); | |
502 | ||
503 | if (udev->head != udev->tail) | |
504 | return POLLIN | POLLRDNORM; | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
29506415 | 509 | static int uinput_release(struct inode *inode, struct file *file) |
1da177e4 | 510 | { |
29506415 | 511 | struct uinput_device *udev = file->private_data; |
1da177e4 | 512 | |
29506415 | 513 | uinput_destroy_device(udev); |
1da177e4 LT |
514 | kfree(udev); |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
2d56f3a3 PL |
519 | #ifdef CONFIG_COMPAT |
520 | struct uinput_ff_upload_compat { | |
521 | int request_id; | |
522 | int retval; | |
523 | struct ff_effect_compat effect; | |
524 | struct ff_effect_compat old; | |
525 | }; | |
526 | ||
527 | static int uinput_ff_upload_to_user(char __user *buffer, | |
528 | const struct uinput_ff_upload *ff_up) | |
529 | { | |
530 | if (INPUT_COMPAT_TEST) { | |
531 | struct uinput_ff_upload_compat ff_up_compat; | |
532 | ||
533 | ff_up_compat.request_id = ff_up->request_id; | |
534 | ff_up_compat.retval = ff_up->retval; | |
535 | /* | |
536 | * It so happens that the pointer that gives us the trouble | |
537 | * is the last field in the structure. Since we don't support | |
538 | * custom waveforms in uinput anyway we can just copy the whole | |
539 | * thing (to the compat size) and ignore the pointer. | |
540 | */ | |
541 | memcpy(&ff_up_compat.effect, &ff_up->effect, | |
542 | sizeof(struct ff_effect_compat)); | |
543 | memcpy(&ff_up_compat.old, &ff_up->old, | |
544 | sizeof(struct ff_effect_compat)); | |
545 | ||
546 | if (copy_to_user(buffer, &ff_up_compat, | |
547 | sizeof(struct uinput_ff_upload_compat))) | |
548 | return -EFAULT; | |
549 | } else { | |
550 | if (copy_to_user(buffer, ff_up, | |
551 | sizeof(struct uinput_ff_upload))) | |
552 | return -EFAULT; | |
553 | } | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
559 | struct uinput_ff_upload *ff_up) | |
560 | { | |
561 | if (INPUT_COMPAT_TEST) { | |
562 | struct uinput_ff_upload_compat ff_up_compat; | |
563 | ||
564 | if (copy_from_user(&ff_up_compat, buffer, | |
565 | sizeof(struct uinput_ff_upload_compat))) | |
566 | return -EFAULT; | |
567 | ||
568 | ff_up->request_id = ff_up_compat.request_id; | |
569 | ff_up->retval = ff_up_compat.retval; | |
570 | memcpy(&ff_up->effect, &ff_up_compat.effect, | |
571 | sizeof(struct ff_effect_compat)); | |
572 | memcpy(&ff_up->old, &ff_up_compat.old, | |
573 | sizeof(struct ff_effect_compat)); | |
574 | ||
575 | } else { | |
576 | if (copy_from_user(ff_up, buffer, | |
577 | sizeof(struct uinput_ff_upload))) | |
578 | return -EFAULT; | |
579 | } | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | #else | |
585 | ||
586 | static int uinput_ff_upload_to_user(char __user *buffer, | |
587 | const struct uinput_ff_upload *ff_up) | |
588 | { | |
589 | if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) | |
590 | return -EFAULT; | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | static int uinput_ff_upload_from_user(const char __user *buffer, | |
596 | struct uinput_ff_upload *ff_up) | |
597 | { | |
598 | if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) | |
599 | return -EFAULT; | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
604 | #endif | |
605 | ||
29506415 DT |
606 | #define uinput_set_bit(_arg, _bit, _max) \ |
607 | ({ \ | |
608 | int __ret = 0; \ | |
609 | if (udev->state == UIST_CREATED) \ | |
610 | __ret = -EINVAL; \ | |
611 | else if ((_arg) > (_max)) \ | |
612 | __ret = -EINVAL; \ | |
613 | else set_bit((_arg), udev->dev->_bit); \ | |
614 | __ret; \ | |
615 | }) | |
616 | ||
2d56f3a3 PL |
617 | static long uinput_ioctl_handler(struct file *file, unsigned int cmd, |
618 | unsigned long arg, void __user *p) | |
1da177e4 | 619 | { |
29506415 | 620 | int retval; |
2d56f3a3 | 621 | struct uinput_device *udev = file->private_data; |
1da177e4 LT |
622 | struct uinput_ff_upload ff_up; |
623 | struct uinput_ff_erase ff_erase; | |
624 | struct uinput_request *req; | |
625 | int length; | |
5b6271bd | 626 | char *phys; |
1da177e4 | 627 | |
221979aa | 628 | retval = mutex_lock_interruptible(&udev->mutex); |
29506415 DT |
629 | if (retval) |
630 | return retval; | |
631 | ||
632 | if (!udev->dev) { | |
633 | retval = uinput_allocate_device(udev); | |
634 | if (retval) | |
635 | goto out; | |
1da177e4 LT |
636 | } |
637 | ||
638 | switch (cmd) { | |
639 | case UI_DEV_CREATE: | |
640 | retval = uinput_create_device(udev); | |
641 | break; | |
642 | ||
643 | case UI_DEV_DESTROY: | |
29506415 | 644 | uinput_destroy_device(udev); |
1da177e4 LT |
645 | break; |
646 | ||
647 | case UI_SET_EVBIT: | |
29506415 | 648 | retval = uinput_set_bit(arg, evbit, EV_MAX); |
1da177e4 LT |
649 | break; |
650 | ||
651 | case UI_SET_KEYBIT: | |
29506415 | 652 | retval = uinput_set_bit(arg, keybit, KEY_MAX); |
1da177e4 LT |
653 | break; |
654 | ||
655 | case UI_SET_RELBIT: | |
29506415 | 656 | retval = uinput_set_bit(arg, relbit, REL_MAX); |
1da177e4 LT |
657 | break; |
658 | ||
659 | case UI_SET_ABSBIT: | |
29506415 | 660 | retval = uinput_set_bit(arg, absbit, ABS_MAX); |
1da177e4 LT |
661 | break; |
662 | ||
663 | case UI_SET_MSCBIT: | |
29506415 | 664 | retval = uinput_set_bit(arg, mscbit, MSC_MAX); |
1da177e4 LT |
665 | break; |
666 | ||
667 | case UI_SET_LEDBIT: | |
29506415 | 668 | retval = uinput_set_bit(arg, ledbit, LED_MAX); |
1da177e4 LT |
669 | break; |
670 | ||
671 | case UI_SET_SNDBIT: | |
29506415 | 672 | retval = uinput_set_bit(arg, sndbit, SND_MAX); |
1da177e4 LT |
673 | break; |
674 | ||
675 | case UI_SET_FFBIT: | |
29506415 | 676 | retval = uinput_set_bit(arg, ffbit, FF_MAX); |
1da177e4 LT |
677 | break; |
678 | ||
59c7c037 DT |
679 | case UI_SET_SWBIT: |
680 | retval = uinput_set_bit(arg, swbit, SW_MAX); | |
681 | break; | |
682 | ||
1da177e4 | 683 | case UI_SET_PHYS: |
29506415 DT |
684 | if (udev->state == UIST_CREATED) { |
685 | retval = -EINVAL; | |
686 | goto out; | |
687 | } | |
1da177e4 LT |
688 | length = strnlen_user(p, 1024); |
689 | if (length <= 0) { | |
690 | retval = -EFAULT; | |
691 | break; | |
692 | } | |
5b6271bd DT |
693 | kfree(udev->dev->phys); |
694 | udev->dev->phys = phys = kmalloc(length, GFP_KERNEL); | |
695 | if (!phys) { | |
1da177e4 LT |
696 | retval = -ENOMEM; |
697 | break; | |
698 | } | |
5b6271bd | 699 | if (copy_from_user(phys, p, length)) { |
1da177e4 | 700 | udev->dev->phys = NULL; |
5b6271bd DT |
701 | kfree(phys); |
702 | retval = -EFAULT; | |
1da177e4 LT |
703 | break; |
704 | } | |
5b6271bd | 705 | phys[length - 1] = '\0'; |
1da177e4 LT |
706 | break; |
707 | ||
708 | case UI_BEGIN_FF_UPLOAD: | |
2d56f3a3 PL |
709 | retval = uinput_ff_upload_from_user(p, &ff_up); |
710 | if (retval) | |
1da177e4 | 711 | break; |
2d56f3a3 | 712 | |
1da177e4 | 713 | req = uinput_request_find(udev, ff_up.request_id); |
2d56f3a3 | 714 | if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) { |
1da177e4 LT |
715 | retval = -EINVAL; |
716 | break; | |
717 | } | |
2d56f3a3 | 718 | |
1da177e4 | 719 | ff_up.retval = 0; |
2d56f3a3 | 720 | ff_up.effect = *req->u.upload.effect; |
ff462551 | 721 | if (req->u.upload.old) |
2d56f3a3 | 722 | ff_up.old = *req->u.upload.old; |
ff462551 AH |
723 | else |
724 | memset(&ff_up.old, 0, sizeof(struct ff_effect)); | |
725 | ||
2d56f3a3 | 726 | retval = uinput_ff_upload_to_user(p, &ff_up); |
1da177e4 LT |
727 | break; |
728 | ||
729 | case UI_BEGIN_FF_ERASE: | |
730 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
731 | retval = -EFAULT; | |
732 | break; | |
733 | } | |
2d56f3a3 | 734 | |
1da177e4 | 735 | req = uinput_request_find(udev, ff_erase.request_id); |
2d56f3a3 | 736 | if (!req || req->code != UI_FF_ERASE) { |
1da177e4 LT |
737 | retval = -EINVAL; |
738 | break; | |
739 | } | |
2d56f3a3 | 740 | |
1da177e4 LT |
741 | ff_erase.retval = 0; |
742 | ff_erase.effect_id = req->u.effect_id; | |
743 | if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { | |
744 | retval = -EFAULT; | |
745 | break; | |
746 | } | |
2d56f3a3 | 747 | |
1da177e4 LT |
748 | break; |
749 | ||
750 | case UI_END_FF_UPLOAD: | |
2d56f3a3 PL |
751 | retval = uinput_ff_upload_from_user(p, &ff_up); |
752 | if (retval) | |
1da177e4 | 753 | break; |
2d56f3a3 | 754 | |
1da177e4 | 755 | req = uinput_request_find(udev, ff_up.request_id); |
2d56f3a3 PL |
756 | if (!req || req->code != UI_FF_UPLOAD || |
757 | !req->u.upload.effect) { | |
1da177e4 LT |
758 | retval = -EINVAL; |
759 | break; | |
760 | } | |
2d56f3a3 | 761 | |
1da177e4 | 762 | req->retval = ff_up.retval; |
0048e603 | 763 | uinput_request_done(udev, req); |
1da177e4 LT |
764 | break; |
765 | ||
766 | case UI_END_FF_ERASE: | |
767 | if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) { | |
768 | retval = -EFAULT; | |
769 | break; | |
770 | } | |
2d56f3a3 | 771 | |
1da177e4 | 772 | req = uinput_request_find(udev, ff_erase.request_id); |
2d56f3a3 | 773 | if (!req || req->code != UI_FF_ERASE) { |
1da177e4 LT |
774 | retval = -EINVAL; |
775 | break; | |
776 | } | |
2d56f3a3 | 777 | |
1da177e4 | 778 | req->retval = ff_erase.retval; |
0048e603 | 779 | uinput_request_done(udev, req); |
1da177e4 LT |
780 | break; |
781 | ||
782 | default: | |
783 | retval = -EINVAL; | |
784 | } | |
29506415 DT |
785 | |
786 | out: | |
221979aa | 787 | mutex_unlock(&udev->mutex); |
1da177e4 LT |
788 | return retval; |
789 | } | |
790 | ||
2d56f3a3 PL |
791 | static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
792 | { | |
793 | return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); | |
794 | } | |
795 | ||
796 | #ifdef CONFIG_COMPAT | |
797 | static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
798 | { | |
799 | return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); | |
800 | } | |
801 | #endif | |
802 | ||
2b8693c0 | 803 | static const struct file_operations uinput_fops = { |
29506415 DT |
804 | .owner = THIS_MODULE, |
805 | .open = uinput_open, | |
806 | .release = uinput_release, | |
807 | .read = uinput_read, | |
808 | .write = uinput_write, | |
809 | .poll = uinput_poll, | |
810 | .unlocked_ioctl = uinput_ioctl, | |
2d56f3a3 PL |
811 | #ifdef CONFIG_COMPAT |
812 | .compat_ioctl = uinput_compat_ioctl, | |
813 | #endif | |
1da177e4 LT |
814 | }; |
815 | ||
816 | static struct miscdevice uinput_misc = { | |
29506415 DT |
817 | .fops = &uinput_fops, |
818 | .minor = UINPUT_MINOR, | |
819 | .name = UINPUT_NAME, | |
1da177e4 | 820 | }; |
8905aaaf KS |
821 | MODULE_ALIAS_MISCDEV(UINPUT_MINOR); |
822 | MODULE_ALIAS("devname:" UINPUT_NAME); | |
1da177e4 LT |
823 | |
824 | static int __init uinput_init(void) | |
825 | { | |
826 | return misc_register(&uinput_misc); | |
827 | } | |
828 | ||
829 | static void __exit uinput_exit(void) | |
830 | { | |
831 | misc_deregister(&uinput_misc); | |
832 | } | |
833 | ||
834 | MODULE_AUTHOR("Aristeu Sergio Rozanski Filho"); | |
835 | MODULE_DESCRIPTION("User level driver support for input subsystem"); | |
836 | MODULE_LICENSE("GPL"); | |
ff462551 | 837 | MODULE_VERSION("0.3"); |
1da177e4 LT |
838 | |
839 | module_init(uinput_init); | |
840 | module_exit(uinput_exit); | |
841 |