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Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[deliverable/linux.git] / drivers / input / misc / uinput.c
CommitLineData
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:
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
39static int uinput_dev_open(struct input_dev *dev)
40{
41 return 0;
42}
43
44static void uinput_dev_close(struct input_dev *dev)
45{
46
47}
48
49static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
50{
51 struct uinput_device *udev;
52
53 udev = dev->private;
54
55 udev->buff[udev->head].type = type;
56 udev->buff[udev->head].code = code;
57 udev->buff[udev->head].value = value;
58 do_gettimeofday(&udev->buff[udev->head].time);
59 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
60
61 wake_up_interruptible(&udev->waitq);
62
63 return 0;
64}
65
66static int uinput_request_alloc_id(struct input_dev *dev, struct uinput_request *request)
67{
68 /* Atomically allocate an ID for the given request. Returns 0 on success. */
69 struct uinput_device *udev = dev->private;
70 int id;
71
72 down(&udev->requests_sem);
73 for (id=0; id<UINPUT_NUM_REQUESTS; id++)
74 if (!udev->requests[id]) {
75 udev->requests[id] = request;
76 request->id = id;
77 up(&udev->requests_sem);
78 return 0;
79 }
80 up(&udev->requests_sem);
81 return -1;
82}
83
84static struct uinput_request* uinput_request_find(struct uinput_device *udev, int id)
85{
86 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
87 if (id >= UINPUT_NUM_REQUESTS || id < 0)
88 return NULL;
89 if (udev->requests[id]->completed)
90 return NULL;
91 return udev->requests[id];
92}
93
94static void uinput_request_init(struct input_dev *dev, struct uinput_request *request, int code)
95{
96 struct uinput_device *udev = dev->private;
97
98 memset(request, 0, sizeof(struct uinput_request));
99 request->code = code;
100 init_waitqueue_head(&request->waitq);
101
102 /* Allocate an ID. If none are available right away, wait. */
103 request->retval = wait_event_interruptible(udev->requests_waitq,
104 !uinput_request_alloc_id(dev, request));
105}
106
107static void uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
108{
109 struct uinput_device *udev = dev->private;
110 int retval;
111
112 /* Tell our userspace app about this new request by queueing an input event */
113 uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
114
115 /* Wait for the request to complete */
116 retval = wait_event_interruptible(request->waitq, request->completed);
117 if (retval)
118 request->retval = retval;
119
120 /* Release this request's ID, let others know it's available */
121 udev->requests[request->id] = NULL;
122 wake_up_interruptible(&udev->requests_waitq);
123}
124
125static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect)
126{
127 struct uinput_request request;
128
129 if (!test_bit(EV_FF, dev->evbit))
130 return -ENOSYS;
131
132 uinput_request_init(dev, &request, UI_FF_UPLOAD);
133 if (request.retval)
134 return request.retval;
135 request.u.effect = effect;
136 uinput_request_submit(dev, &request);
137 return request.retval;
138}
139
140static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
141{
142 struct uinput_request request;
143
144 if (!test_bit(EV_FF, dev->evbit))
145 return -ENOSYS;
146
147 uinput_request_init(dev, &request, UI_FF_ERASE);
148 if (request.retval)
149 return request.retval;
150 request.u.effect_id = effect_id;
151 uinput_request_submit(dev, &request);
152 return request.retval;
153}
154
155static 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->open = uinput_dev_open;
163 udev->dev->close = uinput_dev_close;
164 udev->dev->event = uinput_dev_event;
165 udev->dev->upload_effect = uinput_dev_upload_effect;
166 udev->dev->erase_effect = uinput_dev_erase_effect;
167 udev->dev->private = udev;
168
169 init_waitqueue_head(&(udev->waitq));
170
171 input_register_device(udev->dev);
172
173 set_bit(UIST_CREATED, &(udev->state));
174
175 return 0;
176}
177
178static int uinput_destroy_device(struct uinput_device *udev)
179{
180 if (!test_bit(UIST_CREATED, &(udev->state))) {
181 printk(KERN_WARNING "%s: create the device first\n", UINPUT_NAME);
182 return -EINVAL;
183 }
184
185 input_unregister_device(udev->dev);
186
187 clear_bit(UIST_CREATED, &(udev->state));
188
189 return 0;
190}
191
192static int uinput_open(struct inode *inode, struct file *file)
193{
194 struct uinput_device *newdev;
195 struct input_dev *newinput;
196
197 newdev = kmalloc(sizeof(struct uinput_device), GFP_KERNEL);
198 if (!newdev)
199 goto error;
200 memset(newdev, 0, sizeof(struct uinput_device));
201 init_MUTEX(&newdev->requests_sem);
202 init_waitqueue_head(&newdev->requests_waitq);
203
204 newinput = kmalloc(sizeof(struct input_dev), GFP_KERNEL);
205 if (!newinput)
206 goto cleanup;
207 memset(newinput, 0, sizeof(struct input_dev));
208
209 newdev->dev = newinput;
210
211 file->private_data = newdev;
212
213 return 0;
214cleanup:
215 kfree(newdev);
216error:
217 return -ENOMEM;
218}
219
220static int uinput_validate_absbits(struct input_dev *dev)
221{
222 unsigned int cnt;
223 int retval = 0;
224
225 for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
226 if (!test_bit(cnt, dev->absbit))
227 continue;
228
229 if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
230 printk(KERN_DEBUG
231 "%s: invalid abs[%02x] min:%d max:%d\n",
232 UINPUT_NAME, cnt,
233 dev->absmin[cnt], dev->absmax[cnt]);
234 retval = -EINVAL;
235 break;
236 }
237
238 if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
239 printk(KERN_DEBUG
240 "%s: absflat[%02x] out of range: %d "
241 "(min:%d/max:%d)\n",
242 UINPUT_NAME, cnt, dev->absflat[cnt],
243 dev->absmin[cnt], dev->absmax[cnt]);
244 retval = -EINVAL;
245 break;
246 }
247 }
248 return retval;
249}
250
251static int uinput_alloc_device(struct file *file, const char __user *buffer, size_t count)
252{
253 struct uinput_user_dev *user_dev;
254 struct input_dev *dev;
255 struct uinput_device *udev;
256 int size,
257 retval;
258
259 retval = count;
260
261 udev = file->private_data;
262 dev = udev->dev;
263
264 user_dev = kmalloc(sizeof(*user_dev), GFP_KERNEL);
265 if (!user_dev) {
266 retval = -ENOMEM;
267 goto exit;
268 }
269
270 if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
271 retval = -EFAULT;
272 goto exit;
273 }
274
275 if (NULL != dev->name)
276 kfree(dev->name);
277
278 size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
279 dev->name = kmalloc(size, GFP_KERNEL);
280 if (!dev->name) {
281 retval = -ENOMEM;
282 goto exit;
283 }
284
285 strlcpy(dev->name, user_dev->name, size);
286 dev->id.bustype = user_dev->id.bustype;
287 dev->id.vendor = user_dev->id.vendor;
288 dev->id.product = user_dev->id.product;
289 dev->id.version = user_dev->id.version;
290 dev->ff_effects_max = user_dev->ff_effects_max;
291
292 size = sizeof(int) * (ABS_MAX + 1);
293 memcpy(dev->absmax, user_dev->absmax, size);
294 memcpy(dev->absmin, user_dev->absmin, size);
295 memcpy(dev->absfuzz, user_dev->absfuzz, size);
296 memcpy(dev->absflat, user_dev->absflat, size);
297
298 /* check if absmin/absmax/absfuzz/absflat are filled as
299 * told in Documentation/input/input-programming.txt */
300 if (test_bit(EV_ABS, dev->evbit)) {
b6cbf3ef
IC		 301 int err = uinput_validate_absbits(dev);
302 if (err < 0) {
303 retval = err;
1da177e4 304 kfree(dev->name);
b6cbf3ef 305 }
1da177e4
LT		 306 }
307
308exit:
309 kfree(user_dev);
310 return retval;
311}
312
313static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
314{
315 struct uinput_device *udev = file->private_data;
316
317 if (test_bit(UIST_CREATED, &(udev->state))) {
318 struct input_event ev;
319
320 if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
321 return -EFAULT;
322 input_event(udev->dev, ev.type, ev.code, ev.value);
323 }
324 else
325 count = uinput_alloc_device(file, buffer, count);
326
327 return count;
328}
329
330static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
331{
332 struct uinput_device *udev = file->private_data;
333 int retval = 0;
334
335 if (!test_bit(UIST_CREATED, &(udev->state)))
336 return -ENODEV;
337
338 if ((udev->head == udev->tail) && (file->f_flags & O_NONBLOCK))
339 return -EAGAIN;
340
341 retval = wait_event_interruptible(udev->waitq,
342 (udev->head != udev->tail) ||
343 !test_bit(UIST_CREATED, &(udev->state)));
344
345 if (retval)
346 return retval;
347
348 if (!test_bit(UIST_CREATED, &(udev->state)))
349 return -ENODEV;
350
351 while ((udev->head != udev->tail) &&
352 (retval + sizeof(struct input_event) <= count)) {
353 if (copy_to_user(buffer + retval, &(udev->buff[udev->tail]),
354 sizeof(struct input_event))) return -EFAULT;
355 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
356 retval += sizeof(struct input_event);
357 }
358
359 return retval;
360}
361
362static unsigned int uinput_poll(struct file *file, poll_table *wait)
363{
364 struct uinput_device *udev = file->private_data;
365
366 poll_wait(file, &udev->waitq, wait);
367
368 if (udev->head != udev->tail)
369 return POLLIN | POLLRDNORM;
370
371 return 0;
372}
373
374static int uinput_burn_device(struct uinput_device *udev)
375{
376 if (test_bit(UIST_CREATED, &(udev->state)))
377 uinput_destroy_device(udev);
378
379 if (NULL != udev->dev->name)
380 kfree(udev->dev->name);
381 if (NULL != udev->dev->phys)
382 kfree(udev->dev->phys);
383
384 kfree(udev->dev);
385 kfree(udev);
386
387 return 0;
388}
389
390static int uinput_close(struct inode *inode, struct file *file)
391{
392 return uinput_burn_device(file->private_data);
393}
394
395static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
396{
397 int retval = 0;
398 struct uinput_device *udev;
399 void __user *p = (void __user *)arg;
400 struct uinput_ff_upload ff_up;
401 struct uinput_ff_erase ff_erase;
402 struct uinput_request *req;
403 int length;
404
405 udev = file->private_data;
406
407 /* device attributes can not be changed after the device is created */
408 switch (cmd) {
409 case UI_SET_EVBIT:
410 case UI_SET_KEYBIT:
411 case UI_SET_RELBIT:
412 case UI_SET_ABSBIT:
413 case UI_SET_MSCBIT:
414 case UI_SET_LEDBIT:
415 case UI_SET_SNDBIT:
416 case UI_SET_FFBIT:
417 case UI_SET_PHYS:
418 if (test_bit(UIST_CREATED, &(udev->state)))
419 return -EINVAL;
420 }
421
422 switch (cmd) {
423 case UI_DEV_CREATE:
424 retval = uinput_create_device(udev);
425 break;
426
427 case UI_DEV_DESTROY:
428 retval = uinput_destroy_device(udev);
429 break;
430
431 case UI_SET_EVBIT:
432 if (arg > EV_MAX) {
433 retval = -EINVAL;
434 break;
435 }
436 set_bit(arg, udev->dev->evbit);
437 break;
438
439 case UI_SET_KEYBIT:
440 if (arg > KEY_MAX) {
441 retval = -EINVAL;
442 break;
443 }
444 set_bit(arg, udev->dev->keybit);
445 break;
446
447 case UI_SET_RELBIT:
448 if (arg > REL_MAX) {
449 retval = -EINVAL;
450 break;
451 }
452 set_bit(arg, udev->dev->relbit);
453 break;
454
455 case UI_SET_ABSBIT:
456 if (arg > ABS_MAX) {
457 retval = -EINVAL;
458 break;
459 }
460 set_bit(arg, udev->dev->absbit);
461 break;
462
463 case UI_SET_MSCBIT:
464 if (arg > MSC_MAX) {
465 retval = -EINVAL;
466 break;
467 }
468 set_bit(arg, udev->dev->mscbit);
469 break;
470
471 case UI_SET_LEDBIT:
472 if (arg > LED_MAX) {
473 retval = -EINVAL;
474 break;
475 }
476 set_bit(arg, udev->dev->ledbit);
477 break;
478
479 case UI_SET_SNDBIT:
480 if (arg > SND_MAX) {
481 retval = -EINVAL;
482 break;
483 }
484 set_bit(arg, udev->dev->sndbit);
485 break;
486
487 case UI_SET_FFBIT:
488 if (arg > FF_MAX) {
489 retval = -EINVAL;
490 break;
491 }
492 set_bit(arg, udev->dev->ffbit);
493 break;
494
495 case UI_SET_PHYS:
496 length = strnlen_user(p, 1024);
497 if (length <= 0) {
498 retval = -EFAULT;
499 break;
500 }
501 if (NULL != udev->dev->phys)
502 kfree(udev->dev->phys);
503 udev->dev->phys = kmalloc(length, GFP_KERNEL);
504 if (!udev->dev->phys) {
505 retval = -ENOMEM;
506 break;
507 }
508 if (copy_from_user(udev->dev->phys, p, length)) {
509 retval = -EFAULT;
510 kfree(udev->dev->phys);
511 udev->dev->phys = NULL;
512 break;
513 }
514 udev->dev->phys[length-1] = '\0';
515 break;
516
517 case UI_BEGIN_FF_UPLOAD:
518 if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
519 retval = -EFAULT;
520 break;
521 }
522 req = uinput_request_find(udev, ff_up.request_id);
523 if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) {
524 retval = -EINVAL;
525 break;
526 }
527 ff_up.retval = 0;
528 memcpy(&ff_up.effect, req->u.effect, sizeof(struct ff_effect));
529 if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
530 retval = -EFAULT;
531 break;
532 }
533 break;
534
535 case UI_BEGIN_FF_ERASE:
536 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
537 retval = -EFAULT;
538 break;
539 }
540 req = uinput_request_find(udev, ff_erase.request_id);
541 if (!(req && req->code==UI_FF_ERASE)) {
542 retval = -EINVAL;
543 break;
544 }
545 ff_erase.retval = 0;
546 ff_erase.effect_id = req->u.effect_id;
547 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
548 retval = -EFAULT;
549 break;
550 }
551 break;
552
553 case UI_END_FF_UPLOAD:
554 if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
555 retval = -EFAULT;
556 break;
557 }
558 req = uinput_request_find(udev, ff_up.request_id);
559 if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) {
560 retval = -EINVAL;
561 break;
562 }
563 req->retval = ff_up.retval;
564 memcpy(req->u.effect, &ff_up.effect, sizeof(struct ff_effect));
565 req->completed = 1;
566 wake_up_interruptible(&req->waitq);
567 break;
568
569 case UI_END_FF_ERASE:
570 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
571 retval = -EFAULT;
572 break;
573 }
574 req = uinput_request_find(udev, ff_erase.request_id);
575 if (!(req && req->code==UI_FF_ERASE)) {
576 retval = -EINVAL;
577 break;
578 }
579 req->retval = ff_erase.retval;
580 req->completed = 1;
581 wake_up_interruptible(&req->waitq);
582 break;
583
584 default:
585 retval = -EINVAL;
586 }
587 return retval;
588}
589
590static struct file_operations uinput_fops = {
591 .owner = THIS_MODULE,
592 .open = uinput_open,
593 .release = uinput_close,
594 .read = uinput_read,
595 .write = uinput_write,
596 .poll = uinput_poll,
597 .ioctl = uinput_ioctl,
598};
599
600static struct miscdevice uinput_misc = {
601 .fops = &uinput_fops,
602 .minor = UINPUT_MINOR,
603 .name = UINPUT_NAME,
604};
605
606static int __init uinput_init(void)
607{
608 return misc_register(&uinput_misc);
609}
610
611static void __exit uinput_exit(void)
612{
613 misc_deregister(&uinput_misc);
614}
615
616MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
617MODULE_DESCRIPTION("User level driver support for input subsystem");
618MODULE_LICENSE("GPL");
619
620module_init(uinput_init);
621module_exit(uinput_exit);
622
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