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[PATCH] uniput - fix crash on SMP
[linux-2.6/x86.git] / drivers / input / misc / uinput.c
blob4015a91f4b6e7bcc0a17089f155ebb36233ce16d
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:
23 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
24 * - added force feedback support
25 * - added UI_SET_PHYS
26 * 0.1 20/06/2002
27 * - first public version
28 */
29 #include <linux/poll.h>
30 #include <linux/slab.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/input.h>
34 #include <linux/smp_lock.h>
35 #include <linux/fs.h>
36 #include <linux/miscdevice.h>
37 #include <linux/uinput.h>
38
39 static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
40 {
41 struct uinput_device *udev;
42
43 udev = dev->private;
44
45 udev->buff[udev->head].type = type;
46 udev->buff[udev->head].code = code;
47 udev->buff[udev->head].value = value;
48 do_gettimeofday(&udev->buff[udev->head].time);
49 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
50
51 wake_up_interruptible(&udev->waitq);
52
53 return 0;
54 }
55
56 static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
57 {
58 /* Atomically allocate an ID for the given request. Returns 0 on success. */
59 int id;
60 int err = -1;
61
62 spin_lock(&udev->requests_lock);
63
64 for (id = 0; id < UINPUT_NUM_REQUESTS; id++)
65 if (!udev->requests[id]) {
66 request->id = id;
67 udev->requests[id] = request;
68 err = 0;
69 break;
70 }
71
72 spin_unlock(&udev->requests_lock);
73 return err;
74 }
75
76 static struct uinput_request* uinput_request_find(struct uinput_device *udev, int id)
77 {
78 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
79 if (id >= UINPUT_NUM_REQUESTS || id < 0)
80 return NULL;
81 return udev->requests[id];
82 }
83
84 static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
85 {
86 /* Allocate slot. If none are available right away, wait. */
87 return wait_event_interruptible(udev->requests_waitq,
88 !uinput_request_alloc_id(udev, request));
89 }
90
91 static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
92 {
93 /* Mark slot as available */
94 udev->requests[request->id] = NULL;
95 wake_up_interruptible(&udev->requests_waitq);
96
97 complete(&request->done);
98 }
99
100 static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
101 {
102 int retval;
103
104 /* Tell our userspace app about this new request by queueing an input event */
105 uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
106
107 /* Wait for the request to complete */
108 retval = wait_for_completion_interruptible(&request->done);
109 if (!retval)
110 retval = request->retval;
111
112 return retval;
113 }
114
115 static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect)
116 {
117 struct uinput_request request;
118 int retval;
119
120 if (!test_bit(EV_FF, dev->evbit))
121 return -ENOSYS;
122
123 request.id = -1;
124 init_completion(&request.done);
125 request.code = UI_FF_UPLOAD;
126 request.u.effect = effect;
127
128 retval = uinput_request_reserve_slot(dev->private, &request);
129 if (!retval)
130 retval = uinput_request_submit(dev, &request);
131
132 return retval;
133 }
134
135 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
136 {
137 struct uinput_request request;
138 int retval;
139
140 if (!test_bit(EV_FF, dev->evbit))
141 return -ENOSYS;
142
143 request.id = -1;
144 init_completion(&request.done);
145 request.code = UI_FF_ERASE;
146 request.u.effect_id = effect_id;
147
148 retval = uinput_request_reserve_slot(dev->private, &request);
149 if (!retval)
150 retval = uinput_request_submit(dev, &request);
151
152 return retval;
153 }
154
155 static int uinput_create_device(struct uinput_device *udev)
156 {
157 if (!udev->dev->name) {
158 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
159 return -EINVAL;
160 }
161
162 udev->dev->event = uinput_dev_event;
163 udev->dev->upload_effect = uinput_dev_upload_effect;
164 udev->dev->erase_effect = uinput_dev_erase_effect;
165 udev->dev->private = udev;
166
167 init_waitqueue_head(&udev->waitq);
168
169 input_register_device(udev->dev);
170
171 set_bit(UIST_CREATED, &udev->state);
172
173 return 0;
174 }
175
176 static int uinput_destroy_device(struct uinput_device *udev)
177 {
178 if (!test_bit(UIST_CREATED, &udev->state)) {
179 printk(KERN_WARNING "%s: create the device first\n", UINPUT_NAME);
180 return -EINVAL;
181 }
182
183 input_unregister_device(udev->dev);
184
185 clear_bit(UIST_CREATED, &udev->state);
186
187 return 0;
188 }
189
190 static int uinput_open(struct inode *inode, struct file *file)
191 {
192 struct uinput_device *newdev;
193 struct input_dev *newinput;
194
195 newdev = kmalloc(sizeof(struct uinput_device), GFP_KERNEL);
196 if (!newdev)
197 goto error;
198 memset(newdev, 0, sizeof(struct uinput_device));
199 spin_lock_init(&newdev->requests_lock);
200 init_waitqueue_head(&newdev->requests_waitq);
201
202 newinput = kmalloc(sizeof(struct input_dev), GFP_KERNEL);
203 if (!newinput)
204 goto cleanup;
205 memset(newinput, 0, sizeof(struct input_dev));
206
207 newdev->dev = newinput;
208
209 file->private_data = newdev;
210
211 return 0;
212 cleanup:
213 kfree(newdev);
214 error:
215 return -ENOMEM;
216 }
217
218 static int uinput_validate_absbits(struct input_dev *dev)
219 {
220 unsigned int cnt;
221 int retval = 0;
222
223 for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
224 if (!test_bit(cnt, dev->absbit))
225 continue;
226
227 if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
228 printk(KERN_DEBUG
229 "%s: invalid abs[%02x] min:%d max:%d\n",
230 UINPUT_NAME, cnt,
231 dev->absmin[cnt], dev->absmax[cnt]);
232 retval = -EINVAL;
233 break;
234 }
235
236 if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
237 printk(KERN_DEBUG
238 "%s: absflat[%02x] out of range: %d "
239 "(min:%d/max:%d)\n",
240 UINPUT_NAME, cnt, dev->absflat[cnt],
241 dev->absmin[cnt], dev->absmax[cnt]);
242 retval = -EINVAL;
243 break;
244 }
245 }
246 return retval;
247 }
248
249 static int uinput_alloc_device(struct file *file, const char __user *buffer, size_t count)
250 {
251 struct uinput_user_dev *user_dev;
252 struct input_dev *dev;
253 struct uinput_device *udev;
254 char *name;
255 int size;
256 int retval;
257
258 retval = count;
259
260 udev = file->private_data;
261 dev = udev->dev;
262
263 user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
264 if (!user_dev) {
265 retval = -ENOMEM;
266 goto exit;
267 }
268
269 if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
270 retval = -EFAULT;
271 goto exit;
272 }
273
274 if (dev->name)
275 kfree(dev->name);
276
277 size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
278 dev->name = name = kmalloc(size, GFP_KERNEL);
279 if (!name) {
280 retval = -ENOMEM;
281 goto exit;
282 }
283 strlcpy(name, user_dev->name, size);
284
285 dev->id.bustype = user_dev->id.bustype;
286 dev->id.vendor = user_dev->id.vendor;
287 dev->id.product = user_dev->id.product;
288 dev->id.version = user_dev->id.version;
289 dev->ff_effects_max = user_dev->ff_effects_max;
290
291 size = sizeof(int) * (ABS_MAX + 1);
292 memcpy(dev->absmax, user_dev->absmax, size);
293 memcpy(dev->absmin, user_dev->absmin, size);
294 memcpy(dev->absfuzz, user_dev->absfuzz, size);
295 memcpy(dev->absflat, user_dev->absflat, size);
296
297 /* check if absmin/absmax/absfuzz/absflat are filled as
298 * told in Documentation/input/input-programming.txt */
299 if (test_bit(EV_ABS, dev->evbit)) {
300 int err = uinput_validate_absbits(dev);
301 if (err < 0) {
302 retval = err;
303 kfree(dev->name);
304 }
305 }
306
307 exit:
308 kfree(user_dev);
309 return retval;
310 }
311
312 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
313 {
314 struct uinput_device *udev = file->private_data;
315
316 if (test_bit(UIST_CREATED, &udev->state)) {
317 struct input_event ev;
318
319 if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
320 return -EFAULT;
321 input_event(udev->dev, ev.type, ev.code, ev.value);
322 } else
323 count = uinput_alloc_device(file, buffer, count);
324
325 return count;
326 }
327
328 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
329 {
330 struct uinput_device *udev = file->private_data;
331 int retval = 0;
332
333 if (!test_bit(UIST_CREATED, &udev->state))
334 return -ENODEV;
335
336 if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
337 return -EAGAIN;
338
339 retval = wait_event_interruptible(udev->waitq,
340 udev->head != udev->tail || !test_bit(UIST_CREATED, &udev->state));
341 if (retval)
342 return retval;
343
344 if (!test_bit(UIST_CREATED, &udev->state))
345 return -ENODEV;
346
347 while ((udev->head != udev->tail) &&
348 (retval + sizeof(struct input_event) <= count)) {
349 if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event)))
350 return -EFAULT;
351 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
352 retval += sizeof(struct input_event);
353 }
354
355 return retval;
356 }
357
358 static unsigned int uinput_poll(struct file *file, poll_table *wait)
359 {
360 struct uinput_device *udev = file->private_data;
361
362 poll_wait(file, &udev->waitq, wait);
363
364 if (udev->head != udev->tail)
365 return POLLIN | POLLRDNORM;
366
367 return 0;
368 }
369
370 static int uinput_burn_device(struct uinput_device *udev)
371 {
372 if (test_bit(UIST_CREATED, &udev->state))
373 uinput_destroy_device(udev);
374
375 if (udev->dev->name)
376 kfree(udev->dev->name);
377 if (udev->dev->phys)
378 kfree(udev->dev->phys);
379
380 kfree(udev->dev);
381 kfree(udev);
382
383 return 0;
384 }
385
386 static int uinput_close(struct inode *inode, struct file *file)
387 {
388 uinput_burn_device(file->private_data);
389 return 0;
390 }
391
392 static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
393 {
394 int retval = 0;
395 struct uinput_device *udev;
396 void __user *p = (void __user *)arg;
397 struct uinput_ff_upload ff_up;
398 struct uinput_ff_erase ff_erase;
399 struct uinput_request *req;
400 int length;
401 char *phys;
402
403 udev = file->private_data;
404
405 /* device attributes can not be changed after the device is created */
406 switch (cmd) {
407 case UI_SET_EVBIT:
408 case UI_SET_KEYBIT:
409 case UI_SET_RELBIT:
410 case UI_SET_ABSBIT:
411 case UI_SET_MSCBIT:
412 case UI_SET_LEDBIT:
413 case UI_SET_SNDBIT:
414 case UI_SET_FFBIT:
415 case UI_SET_PHYS:
416 if (test_bit(UIST_CREATED, &udev->state))
417 return -EINVAL;
418 }
419
420 switch (cmd) {
421 case UI_DEV_CREATE:
422 retval = uinput_create_device(udev);
423 break;
424
425 case UI_DEV_DESTROY:
426 retval = uinput_destroy_device(udev);
427 break;
428
429 case UI_SET_EVBIT:
430 if (arg > EV_MAX) {
431 retval = -EINVAL;
432 break;
433 }
434 set_bit(arg, udev->dev->evbit);
435 break;
436
437 case UI_SET_KEYBIT:
438 if (arg > KEY_MAX) {
439 retval = -EINVAL;
440 break;
441 }
442 set_bit(arg, udev->dev->keybit);
443 break;
444
445 case UI_SET_RELBIT:
446 if (arg > REL_MAX) {
447 retval = -EINVAL;
448 break;
449 }
450 set_bit(arg, udev->dev->relbit);
451 break;
452
453 case UI_SET_ABSBIT:
454 if (arg > ABS_MAX) {
455 retval = -EINVAL;
456 break;
457 }
458 set_bit(arg, udev->dev->absbit);
459 break;
460
461 case UI_SET_MSCBIT:
462 if (arg > MSC_MAX) {
463 retval = -EINVAL;
464 break;
465 }
466 set_bit(arg, udev->dev->mscbit);
467 break;
468
469 case UI_SET_LEDBIT:
470 if (arg > LED_MAX) {
471 retval = -EINVAL;
472 break;
473 }
474 set_bit(arg, udev->dev->ledbit);
475 break;
476
477 case UI_SET_SNDBIT:
478 if (arg > SND_MAX) {
479 retval = -EINVAL;
480 break;
481 }
482 set_bit(arg, udev->dev->sndbit);
483 break;
484
485 case UI_SET_FFBIT:
486 if (arg > FF_MAX) {
487 retval = -EINVAL;
488 break;
489 }
490 set_bit(arg, udev->dev->ffbit);
491 break;
492
493 case UI_SET_PHYS:
494 length = strnlen_user(p, 1024);
495 if (length <= 0) {
496 retval = -EFAULT;
497 break;
498 }
499 kfree(udev->dev->phys);
500 udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
501 if (!phys) {
502 retval = -ENOMEM;
503 break;
504 }
505 if (copy_from_user(phys, p, length)) {
506 udev->dev->phys = NULL;
507 kfree(phys);
508 retval = -EFAULT;
509 break;
510 }
511 phys[length - 1] = '\0';
512 break;
513
514 case UI_BEGIN_FF_UPLOAD:
515 if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
516 retval = -EFAULT;
517 break;
518 }
519 req = uinput_request_find(udev, ff_up.request_id);
520 if (!(req && req->code == UI_FF_UPLOAD && req->u.effect)) {
521 retval = -EINVAL;
522 break;
523 }
524 ff_up.retval = 0;
525 memcpy(&ff_up.effect, req->u.effect, sizeof(struct ff_effect));
526 if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
527 retval = -EFAULT;
528 break;
529 }
530 break;
531
532 case UI_BEGIN_FF_ERASE:
533 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
534 retval = -EFAULT;
535 break;
536 }
537 req = uinput_request_find(udev, ff_erase.request_id);
538 if (!(req && req->code == UI_FF_ERASE)) {
539 retval = -EINVAL;
540 break;
541 }
542 ff_erase.retval = 0;
543 ff_erase.effect_id = req->u.effect_id;
544 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
545 retval = -EFAULT;
546 break;
547 }
548 break;
549
550 case UI_END_FF_UPLOAD:
551 if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
552 retval = -EFAULT;
553 break;
554 }
555 req = uinput_request_find(udev, ff_up.request_id);
556 if (!(req && req->code == UI_FF_UPLOAD && req->u.effect)) {
557 retval = -EINVAL;
558 break;
559 }
560 req->retval = ff_up.retval;
561 memcpy(req->u.effect, &ff_up.effect, sizeof(struct ff_effect));
562 uinput_request_done(udev, req);
563 break;
564
565 case UI_END_FF_ERASE:
566 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
567 retval = -EFAULT;
568 break;
569 }
570 req = uinput_request_find(udev, ff_erase.request_id);
571 if (!(req && req->code == UI_FF_ERASE)) {
572 retval = -EINVAL;
573 break;
574 }
575 req->retval = ff_erase.retval;
576 uinput_request_done(udev, req);
577 break;
578
579 default:
580 retval = -EINVAL;
581 }
582 return retval;
583 }
584
585 static struct file_operations uinput_fops = {
586 .owner = THIS_MODULE,
587 .open = uinput_open,
588 .release = uinput_close,
589 .read = uinput_read,
590 .write = uinput_write,
591 .poll = uinput_poll,
592 .ioctl = uinput_ioctl,
593 };
594
595 static struct miscdevice uinput_misc = {
596 .fops = &uinput_fops,
597 .minor = UINPUT_MINOR,
598 .name = UINPUT_NAME,
599 };
600
601 static int __init uinput_init(void)
602 {
603 return misc_register(&uinput_misc);
604 }
605
606 static void __exit uinput_exit(void)
607 {
608 misc_deregister(&uinput_misc);
609 }
610
611 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
612 MODULE_DESCRIPTION("User level driver support for input subsystem");
613 MODULE_LICENSE("GPL");
614
615 module_init(uinput_init);
616 module_exit(uinput_exit);
617
x86 "subsystem" repository