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System call wrappers part 05
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / input / misc / uinput.c
blob223d56d5555b345e9068e9d7957e8843f980c032
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 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
24 * - updated ff support for the changes in kernel interface
25 * - added MODULE_VERSION
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>
33 #include <linux/slab.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/smp_lock.h>
37 #include <linux/fs.h>
38 #include <linux/miscdevice.h>
39 #include <linux/uinput.h>
40
41 static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
42 {
43 struct uinput_device *udev = input_get_drvdata(dev);
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(&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 /* Tell our userspace app about this new request by queueing an input event */
103 uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
104
105 /* Wait for the request to complete */
106 wait_for_completion(&request->done);
107 return request->retval;
108 }
109
110 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
111 {
112 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
113 }
114
115 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
116 {
117 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
118 }
119
120 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
121 {
122 return uinput_dev_event(dev, EV_FF, effect_id, value);
123 }
124
125 static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
126 {
127 struct uinput_request request;
128 int retval;
129
130 request.id = -1;
131 init_completion(&request.done);
132 request.code = UI_FF_UPLOAD;
133 request.u.upload.effect = effect;
134 request.u.upload.old = old;
135
136 retval = uinput_request_reserve_slot(input_get_drvdata(dev), &request);
137 if (!retval)
138 retval = uinput_request_submit(dev, &request);
139
140 return retval;
141 }
142
143 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
144 {
145 struct uinput_request request;
146 int retval;
147
148 if (!test_bit(EV_FF, dev->evbit))
149 return -ENOSYS;
150
151 request.id = -1;
152 init_completion(&request.done);
153 request.code = UI_FF_ERASE;
154 request.u.effect_id = effect_id;
155
156 retval = uinput_request_reserve_slot(input_get_drvdata(dev), &request);
157 if (!retval)
158 retval = uinput_request_submit(dev, &request);
159
160 return retval;
161 }
162
163 static void uinput_destroy_device(struct uinput_device *udev)
164 {
165 const char *name, *phys;
166
167 if (udev->dev) {
168 name = udev->dev->name;
169 phys = udev->dev->phys;
170 if (udev->state == UIST_CREATED)
171 input_unregister_device(udev->dev);
172 else
173 input_free_device(udev->dev);
174 kfree(name);
175 kfree(phys);
176 udev->dev = NULL;
177 }
178
179 udev->state = UIST_NEW_DEVICE;
180 }
181
182 static int uinput_create_device(struct uinput_device *udev)
183 {
184 struct input_dev *dev = udev->dev;
185 int error;
186
187 if (udev->state != UIST_SETUP_COMPLETE) {
188 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
189 return -EINVAL;
190 }
191
192 if (udev->ff_effects_max) {
193 error = input_ff_create(dev, udev->ff_effects_max);
194 if (error)
195 goto fail1;
196
197 dev->ff->upload = uinput_dev_upload_effect;
198 dev->ff->erase = uinput_dev_erase_effect;
199 dev->ff->playback = uinput_dev_playback;
200 dev->ff->set_gain = uinput_dev_set_gain;
201 dev->ff->set_autocenter = uinput_dev_set_autocenter;
202 }
203
204 error = input_register_device(udev->dev);
205 if (error)
206 goto fail2;
207
208 udev->state = UIST_CREATED;
209
210 return 0;
211
212 fail2: input_ff_destroy(dev);
213 fail1: uinput_destroy_device(udev);
214 return error;
215 }
216
217 static int uinput_open(struct inode *inode, struct file *file)
218 {
219 struct uinput_device *newdev;
220
221 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
222 if (!newdev)
223 return -ENOMEM;
224
225 lock_kernel();
226 mutex_init(&newdev->mutex);
227 spin_lock_init(&newdev->requests_lock);
228 init_waitqueue_head(&newdev->requests_waitq);
229 init_waitqueue_head(&newdev->waitq);
230 newdev->state = UIST_NEW_DEVICE;
231
232 file->private_data = newdev;
233 unlock_kernel();
234
235 return 0;
236 }
237
238 static int uinput_validate_absbits(struct input_dev *dev)
239 {
240 unsigned int cnt;
241 int retval = 0;
242
243 for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
244 if (!test_bit(cnt, dev->absbit))
245 continue;
246
247 if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
248 printk(KERN_DEBUG
249 "%s: invalid abs[%02x] min:%d max:%d\n",
250 UINPUT_NAME, cnt,
251 dev->absmin[cnt], dev->absmax[cnt]);
252 retval = -EINVAL;
253 break;
254 }
255
256 if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
257 printk(KERN_DEBUG
258 "%s: absflat[%02x] out of range: %d "
259 "(min:%d/max:%d)\n",
260 UINPUT_NAME, cnt, dev->absflat[cnt],
261 dev->absmin[cnt], dev->absmax[cnt]);
262 retval = -EINVAL;
263 break;
264 }
265 }
266 return retval;
267 }
268
269 static int uinput_allocate_device(struct uinput_device *udev)
270 {
271 udev->dev = input_allocate_device();
272 if (!udev->dev)
273 return -ENOMEM;
274
275 udev->dev->event = uinput_dev_event;
276 input_set_drvdata(udev->dev, udev);
277
278 return 0;
279 }
280
281 static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
282 {
283 struct uinput_user_dev *user_dev;
284 struct input_dev *dev;
285 char *name;
286 int size;
287 int retval;
288
289 if (count != sizeof(struct uinput_user_dev))
290 return -EINVAL;
291
292 if (!udev->dev) {
293 retval = uinput_allocate_device(udev);
294 if (retval)
295 return retval;
296 }
297
298 dev = udev->dev;
299
300 user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
301 if (!user_dev)
302 return -ENOMEM;
303
304 if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
305 retval = -EFAULT;
306 goto exit;
307 }
308
309 udev->ff_effects_max = user_dev->ff_effects_max;
310
311 size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
312 if (!size) {
313 retval = -EINVAL;
314 goto exit;
315 }
316
317 kfree(dev->name);
318 dev->name = name = kmalloc(size, GFP_KERNEL);
319 if (!name) {
320 retval = -ENOMEM;
321 goto exit;
322 }
323 strlcpy(name, user_dev->name, size);
324
325 dev->id.bustype = user_dev->id.bustype;
326 dev->id.vendor = user_dev->id.vendor;
327 dev->id.product = user_dev->id.product;
328 dev->id.version = user_dev->id.version;
329
330 size = sizeof(int) * (ABS_MAX + 1);
331 memcpy(dev->absmax, user_dev->absmax, size);
332 memcpy(dev->absmin, user_dev->absmin, size);
333 memcpy(dev->absfuzz, user_dev->absfuzz, size);
334 memcpy(dev->absflat, user_dev->absflat, size);
335
336 /* check if absmin/absmax/absfuzz/absflat are filled as
337 * told in Documentation/input/input-programming.txt */
338 if (test_bit(EV_ABS, dev->evbit)) {
339 retval = uinput_validate_absbits(dev);
340 if (retval < 0)
341 goto exit;
342 }
343
344 udev->state = UIST_SETUP_COMPLETE;
345 retval = count;
346
347 exit:
348 kfree(user_dev);
349 return retval;
350 }
351
352 static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
353 {
354 struct input_event ev;
355
356 if (count != sizeof(struct input_event))
357 return -EINVAL;
358
359 if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
360 return -EFAULT;
361
362 input_event(udev->dev, ev.type, ev.code, ev.value);
363
364 return sizeof(struct input_event);
365 }
366
367 static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
368 {
369 struct uinput_device *udev = file->private_data;
370 int retval;
371
372 retval = mutex_lock_interruptible(&udev->mutex);
373 if (retval)
374 return retval;
375
376 retval = udev->state == UIST_CREATED ?
377 uinput_inject_event(udev, buffer, count) :
378 uinput_setup_device(udev, buffer, count);
379
380 mutex_unlock(&udev->mutex);
381
382 return retval;
383 }
384
385 static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
386 {
387 struct uinput_device *udev = file->private_data;
388 int retval = 0;
389
390 if (udev->state != UIST_CREATED)
391 return -ENODEV;
392
393 if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
394 return -EAGAIN;
395
396 retval = wait_event_interruptible(udev->waitq,
397 udev->head != udev->tail || udev->state != UIST_CREATED);
398 if (retval)
399 return retval;
400
401 retval = mutex_lock_interruptible(&udev->mutex);
402 if (retval)
403 return retval;
404
405 if (udev->state != UIST_CREATED) {
406 retval = -ENODEV;
407 goto out;
408 }
409
410 while (udev->head != udev->tail && retval + sizeof(struct input_event) <= count) {
411 if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event))) {
412 retval = -EFAULT;
413 goto out;
414 }
415 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
416 retval += sizeof(struct input_event);
417 }
418
419 out:
420 mutex_unlock(&udev->mutex);
421
422 return retval;
423 }
424
425 static unsigned int uinput_poll(struct file *file, poll_table *wait)
426 {
427 struct uinput_device *udev = file->private_data;
428
429 poll_wait(file, &udev->waitq, wait);
430
431 if (udev->head != udev->tail)
432 return POLLIN | POLLRDNORM;
433
434 return 0;
435 }
436
437 static int uinput_release(struct inode *inode, struct file *file)
438 {
439 struct uinput_device *udev = file->private_data;
440
441 uinput_destroy_device(udev);
442 kfree(udev);
443
444 return 0;
445 }
446
447 #define uinput_set_bit(_arg, _bit, _max) \
448 ({ \
449 int __ret = 0; \
450 if (udev->state == UIST_CREATED) \
451 __ret = -EINVAL; \
452 else if ((_arg) > (_max)) \
453 __ret = -EINVAL; \
454 else set_bit((_arg), udev->dev->_bit); \
455 __ret; \
456 })
457
458 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
459 {
460 int retval;
461 struct uinput_device *udev;
462 void __user *p = (void __user *)arg;
463 struct uinput_ff_upload ff_up;
464 struct uinput_ff_erase ff_erase;
465 struct uinput_request *req;
466 int length;
467 char *phys;
468
469 udev = file->private_data;
470
471 retval = mutex_lock_interruptible(&udev->mutex);
472 if (retval)
473 return retval;
474
475 if (!udev->dev) {
476 retval = uinput_allocate_device(udev);
477 if (retval)
478 goto out;
479 }
480
481 switch (cmd) {
482 case UI_DEV_CREATE:
483 retval = uinput_create_device(udev);
484 break;
485
486 case UI_DEV_DESTROY:
487 uinput_destroy_device(udev);
488 break;
489
490 case UI_SET_EVBIT:
491 retval = uinput_set_bit(arg, evbit, EV_MAX);
492 break;
493
494 case UI_SET_KEYBIT:
495 retval = uinput_set_bit(arg, keybit, KEY_MAX);
496 break;
497
498 case UI_SET_RELBIT:
499 retval = uinput_set_bit(arg, relbit, REL_MAX);
500 break;
501
502 case UI_SET_ABSBIT:
503 retval = uinput_set_bit(arg, absbit, ABS_MAX);
504 break;
505
506 case UI_SET_MSCBIT:
507 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
508 break;
509
510 case UI_SET_LEDBIT:
511 retval = uinput_set_bit(arg, ledbit, LED_MAX);
512 break;
513
514 case UI_SET_SNDBIT:
515 retval = uinput_set_bit(arg, sndbit, SND_MAX);
516 break;
517
518 case UI_SET_FFBIT:
519 retval = uinput_set_bit(arg, ffbit, FF_MAX);
520 break;
521
522 case UI_SET_SWBIT:
523 retval = uinput_set_bit(arg, swbit, SW_MAX);
524 break;
525
526 case UI_SET_PHYS:
527 if (udev->state == UIST_CREATED) {
528 retval = -EINVAL;
529 goto out;
530 }
531 length = strnlen_user(p, 1024);
532 if (length <= 0) {
533 retval = -EFAULT;
534 break;
535 }
536 kfree(udev->dev->phys);
537 udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
538 if (!phys) {
539 retval = -ENOMEM;
540 break;
541 }
542 if (copy_from_user(phys, p, length)) {
543 udev->dev->phys = NULL;
544 kfree(phys);
545 retval = -EFAULT;
546 break;
547 }
548 phys[length - 1] = '\0';
549 break;
550
551 case UI_BEGIN_FF_UPLOAD:
552 if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
553 retval = -EFAULT;
554 break;
555 }
556 req = uinput_request_find(udev, ff_up.request_id);
557 if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) {
558 retval = -EINVAL;
559 break;
560 }
561 ff_up.retval = 0;
562 memcpy(&ff_up.effect, req->u.upload.effect, sizeof(struct ff_effect));
563 if (req->u.upload.old)
564 memcpy(&ff_up.old, req->u.upload.old, sizeof(struct ff_effect));
565 else
566 memset(&ff_up.old, 0, sizeof(struct ff_effect));
567
568 if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
569 retval = -EFAULT;
570 break;
571 }
572 break;
573
574 case UI_BEGIN_FF_ERASE:
575 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
576 retval = -EFAULT;
577 break;
578 }
579 req = uinput_request_find(udev, ff_erase.request_id);
580 if (!(req && req->code == UI_FF_ERASE)) {
581 retval = -EINVAL;
582 break;
583 }
584 ff_erase.retval = 0;
585 ff_erase.effect_id = req->u.effect_id;
586 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
587 retval = -EFAULT;
588 break;
589 }
590 break;
591
592 case UI_END_FF_UPLOAD:
593 if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
594 retval = -EFAULT;
595 break;
596 }
597 req = uinput_request_find(udev, ff_up.request_id);
598 if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) {
599 retval = -EINVAL;
600 break;
601 }
602 req->retval = ff_up.retval;
603 uinput_request_done(udev, req);
604 break;
605
606 case UI_END_FF_ERASE:
607 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
608 retval = -EFAULT;
609 break;
610 }
611 req = uinput_request_find(udev, ff_erase.request_id);
612 if (!(req && req->code == UI_FF_ERASE)) {
613 retval = -EINVAL;
614 break;
615 }
616 req->retval = ff_erase.retval;
617 uinput_request_done(udev, req);
618 break;
619
620 default:
621 retval = -EINVAL;
622 }
623
624 out:
625 mutex_unlock(&udev->mutex);
626 return retval;
627 }
628
629 static const struct file_operations uinput_fops = {
630 .owner = THIS_MODULE,
631 .open = uinput_open,
632 .release = uinput_release,
633 .read = uinput_read,
634 .write = uinput_write,
635 .poll = uinput_poll,
636 .unlocked_ioctl = uinput_ioctl,
637 };
638
639 static struct miscdevice uinput_misc = {
640 .fops = &uinput_fops,
641 .minor = UINPUT_MINOR,
642 .name = UINPUT_NAME,
643 };
644
645 static int __init uinput_init(void)
646 {
647 return misc_register(&uinput_misc);
648 }
649
650 static void __exit uinput_exit(void)
651 {
652 misc_deregister(&uinput_misc);
653 }
654
655 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
656 MODULE_DESCRIPTION("User level driver support for input subsystem");
657 MODULE_LICENSE("GPL");
658 MODULE_VERSION("0.3");
659
660 module_init(uinput_init);
661 module_exit(uinput_exit);
662
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