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10
11#define EVDEV_MINOR_BASE 64
12#define EVDEV_MINORS 32
13#define EVDEV_BUFFER_SIZE 64
14
15#include <linux/poll.h>
16#include <linux/sched.h>
17#include <linux/slab.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/input.h>
21#include <linux/major.h>
22#include <linux/device.h>
23#include "input-compat.h"
24
25struct evdev {
26 int exist;
27 int open;
28 int minor;
29 struct input_handle handle;
30 wait_queue_head_t wait;
31 struct evdev_client *grab;
32 struct list_head client_list;
33 spinlock_t client_lock;
34 struct mutex mutex;
35 struct device dev;
36};
37
38struct evdev_client {
39 struct input_event buffer[EVDEV_BUFFER_SIZE];
40 int head;
41 int tail;
42 spinlock_t buffer_lock;
43 struct fasync_struct *fasync;
44 struct evdev *evdev;
45 struct list_head node;
46};
47
48static struct evdev *evdev_table[EVDEV_MINORS];
49static DEFINE_MUTEX(evdev_table_mutex);
50
51static void evdev_pass_event(struct evdev_client *client,
52 struct input_event *event)
53{
54
55
56
57 spin_lock(&client->buffer_lock);
58 client->buffer[client->head++] = *event;
59 client->head &= EVDEV_BUFFER_SIZE - 1;
60 spin_unlock(&client->buffer_lock);
61
62 kill_fasync(&client->fasync, SIGIO, POLL_IN);
63}
64
65
66
67
68static void evdev_event(struct input_handle *handle,
69 unsigned int type, unsigned int code, int value)
70{
71 struct evdev *evdev = handle->private;
72 struct evdev_client *client;
73 struct input_event event;
74
75 do_gettimeofday(&event.time);
76 event.type = type;
77 event.code = code;
78 event.value = value;
79
80 rcu_read_lock();
81
82 client = rcu_dereference(evdev->grab);
83 if (client)
84 evdev_pass_event(client, &event);
85 else
86 list_for_each_entry_rcu(client, &evdev->client_list, node)
87 evdev_pass_event(client, &event);
88
89 rcu_read_unlock();
90
91 wake_up_interruptible(&evdev->wait);
92}
93
94static int evdev_fasync(int fd, struct file *file, int on)
95{
96 struct evdev_client *client = file->private_data;
97
98 return fasync_helper(fd, file, on, &client->fasync);
99}
100
101static int evdev_flush(struct file *file, fl_owner_t id)
102{
103 struct evdev_client *client = file->private_data;
104 struct evdev *evdev = client->evdev;
105 int retval;
106
107 retval = mutex_lock_interruptible(&evdev->mutex);
108 if (retval)
109 return retval;
110
111 if (!evdev->exist)
112 retval = -ENODEV;
113 else
114 retval = input_flush_device(&evdev->handle, file);
115
116 mutex_unlock(&evdev->mutex);
117 return retval;
118}
119
120static void evdev_free(struct device *dev)
121{
122 struct evdev *evdev = container_of(dev, struct evdev, dev);
123
124 input_put_device(evdev->handle.dev);
125 kfree(evdev);
126}
127
128
129
130
131
132static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
133{
134 int error;
135
136 if (evdev->grab)
137 return -EBUSY;
138
139 error = input_grab_device(&evdev->handle);
140 if (error)
141 return error;
142
143 rcu_assign_pointer(evdev->grab, client);
144 synchronize_rcu();
145
146 return 0;
147}
148
149static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
150{
151 if (evdev->grab != client)
152 return -EINVAL;
153
154 rcu_assign_pointer(evdev->grab, NULL);
155 synchronize_rcu();
156 input_release_device(&evdev->handle);
157
158 return 0;
159}
160
161static void evdev_attach_client(struct evdev *evdev,
162 struct evdev_client *client)
163{
164 spin_lock(&evdev->client_lock);
165 list_add_tail_rcu(&client->node, &evdev->client_list);
166 spin_unlock(&evdev->client_lock);
167 synchronize_rcu();
168}
169
170static void evdev_detach_client(struct evdev *evdev,
171 struct evdev_client *client)
172{
173 spin_lock(&evdev->client_lock);
174 list_del_rcu(&client->node);
175 spin_unlock(&evdev->client_lock);
176 synchronize_rcu();
177}
178
179static int evdev_open_device(struct evdev *evdev)
180{
181 int retval;
182
183 retval = mutex_lock_interruptible(&evdev->mutex);
184 if (retval)
185 return retval;
186
187 if (!evdev->exist)
188 retval = -ENODEV;
189 else if (!evdev->open++) {
190 retval = input_open_device(&evdev->handle);
191 if (retval)
192 evdev->open--;
193 }
194
195 mutex_unlock(&evdev->mutex);
196 return retval;
197}
198
199static void evdev_close_device(struct evdev *evdev)
200{
201 mutex_lock(&evdev->mutex);
202
203 if (evdev->exist && !--evdev->open)
204 input_close_device(&evdev->handle);
205
206 mutex_unlock(&evdev->mutex);
207}
208
209
210
211
212
213static void evdev_hangup(struct evdev *evdev)
214{
215 struct evdev_client *client;
216
217 spin_lock(&evdev->client_lock);
218 list_for_each_entry(client, &evdev->client_list, node)
219 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
220 spin_unlock(&evdev->client_lock);
221
222 wake_up_interruptible(&evdev->wait);
223}
224
225static int evdev_release(struct inode *inode, struct file *file)
226{
227 struct evdev_client *client = file->private_data;
228 struct evdev *evdev = client->evdev;
229
230 mutex_lock(&evdev->mutex);
231 if (evdev->grab == client)
232 evdev_ungrab(evdev, client);
233 mutex_unlock(&evdev->mutex);
234
235 evdev_detach_client(evdev, client);
236 kfree(client);
237
238 evdev_close_device(evdev);
239 put_device(&evdev->dev);
240
241 return 0;
242}
243
244static int evdev_open(struct inode *inode, struct file *file)
245{
246 struct evdev *evdev;
247 struct evdev_client *client;
248 int i = iminor(inode) - EVDEV_MINOR_BASE;
249 int error;
250
251 if (i >= EVDEV_MINORS)
252 return -ENODEV;
253
254 error = mutex_lock_interruptible(&evdev_table_mutex);
255 if (error)
256 return error;
257 evdev = evdev_table[i];
258 if (evdev)
259 get_device(&evdev->dev);
260 mutex_unlock(&evdev_table_mutex);
261
262 if (!evdev)
263 return -ENODEV;
264
265 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
266 if (!client) {
267 error = -ENOMEM;
268 goto err_put_evdev;
269 }
270
271 spin_lock_init(&client->buffer_lock);
272 client->evdev = evdev;
273 evdev_attach_client(evdev, client);
274
275 error = evdev_open_device(evdev);
276 if (error)
277 goto err_free_client;
278
279 file->private_data = client;
280 return 0;
281
282 err_free_client:
283 evdev_detach_client(evdev, client);
284 kfree(client);
285 err_put_evdev:
286 put_device(&evdev->dev);
287 return error;
288}
289
290static ssize_t evdev_write(struct file *file, const char __user *buffer,
291 size_t count, loff_t *ppos)
292{
293 struct evdev_client *client = file->private_data;
294 struct evdev *evdev = client->evdev;
295 struct input_event event;
296 int retval;
297
298 retval = mutex_lock_interruptible(&evdev->mutex);
299 if (retval)
300 return retval;
301
302 if (!evdev->exist) {
303 retval = -ENODEV;
304 goto out;
305 }
306
307 while (retval < count) {
308
309 if (input_event_from_user(buffer + retval, &event)) {
310 retval = -EFAULT;
311 goto out;
312 }
313
314 input_inject_event(&evdev->handle,
315 event.type, event.code, event.value);
316 retval += input_event_size();
317 }
318
319 out:
320 mutex_unlock(&evdev->mutex);
321 return retval;
322}
323
324static int evdev_fetch_next_event(struct evdev_client *client,
325 struct input_event *event)
326{
327 int have_event;
328
329 spin_lock_irq(&client->buffer_lock);
330
331 have_event = client->head != client->tail;
332 if (have_event) {
333 *event = client->buffer[client->tail++];
334 client->tail &= EVDEV_BUFFER_SIZE - 1;
335 }
336
337 spin_unlock_irq(&client->buffer_lock);
338
339 return have_event;
340}
341
342static ssize_t evdev_read(struct file *file, char __user *buffer,
343 size_t count, loff_t *ppos)
344{
345 struct evdev_client *client = file->private_data;
346 struct evdev *evdev = client->evdev;
347 struct input_event event;
348 int retval;
349
350 if (count < input_event_size())
351 return -EINVAL;
352
353 if (client->head == client->tail && evdev->exist &&
354 (file->f_flags & O_NONBLOCK))
355 return -EAGAIN;
356
357 retval = wait_event_interruptible(evdev->wait,
358 client->head != client->tail || !evdev->exist);
359 if (retval)
360 return retval;
361
362 if (!evdev->exist)
363 return -ENODEV;
364
365 while (retval + input_event_size() <= count &&
366 evdev_fetch_next_event(client, &event)) {
367
368 if (input_event_to_user(buffer + retval, &event))
369 return -EFAULT;
370
371 retval += input_event_size();
372 }
373
374 return retval;
375}
376
377
378static unsigned int evdev_poll(struct file *file, poll_table *wait)
379{
380 struct evdev_client *client = file->private_data;
381 struct evdev *evdev = client->evdev;
382
383 poll_wait(file, &evdev->wait, wait);
384 return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
385 (evdev->exist ? 0 : (POLLHUP | POLLERR));
386}
387
388#ifdef CONFIG_COMPAT
389
390#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
391#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
392
393#ifdef __BIG_ENDIAN
394static int bits_to_user(unsigned long *bits, unsigned int maxbit,
395 unsigned int maxlen, void __user *p, int compat)
396{
397 int len, i;
398
399 if (compat) {
400 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
401 if (len > maxlen)
402 len = maxlen;
403
404 for (i = 0; i < len / sizeof(compat_long_t); i++)
405 if (copy_to_user((compat_long_t __user *) p + i,
406 (compat_long_t *) bits +
407 i + 1 - ((i % 2) << 1),
408 sizeof(compat_long_t)))
409 return -EFAULT;
410 } else {
411 len = BITS_TO_LONGS(maxbit) * sizeof(long);
412 if (len > maxlen)
413 len = maxlen;
414
415 if (copy_to_user(p, bits, len))
416 return -EFAULT;
417 }
418
419 return len;
420}
421#else
422static int bits_to_user(unsigned long *bits, unsigned int maxbit,
423 unsigned int maxlen, void __user *p, int compat)
424{
425 int len = compat ?
426 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
427 BITS_TO_LONGS(maxbit) * sizeof(long);
428
429 if (len > maxlen)
430 len = maxlen;
431
432 return copy_to_user(p, bits, len) ? -EFAULT : len;
433}
434#endif
435
436#else
437
438static int bits_to_user(unsigned long *bits, unsigned int maxbit,
439 unsigned int maxlen, void __user *p, int compat)
440{
441 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
442
443 if (len > maxlen)
444 len = maxlen;
445
446 return copy_to_user(p, bits, len) ? -EFAULT : len;
447}
448
449#endif
450
451static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
452{
453 int len;
454
455 if (!str)
456 return -ENOENT;
457
458 len = strlen(str) + 1;
459 if (len > maxlen)
460 len = maxlen;
461
462 return copy_to_user(p, str, len) ? -EFAULT : len;
463}
464
465#define OLD_KEY_MAX 0x1ff
466static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode)
467{
468 static unsigned long keymax_warn_time;
469 unsigned long *bits;
470 int len;
471
472 switch (_IOC_NR(cmd) & EV_MAX) {
473
474 case 0: bits = dev->evbit; len = EV_MAX; break;
475 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
476 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
477 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
478 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
479 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
480 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
481 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
482 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
483 default: return -EINVAL;
484 }
485
486
487
488
489
490
491 if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) {
492 len = OLD_KEY_MAX;
493 if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
494 printk(KERN_WARNING
495 "evdev.c(EVIOCGBIT): Suspicious buffer size %u, "
496 "limiting output to %zu bytes. See "
497 "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
498 OLD_KEY_MAX,
499 BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
500 }
501
502 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
503}
504#undef OLD_KEY_MAX
505
506static long evdev_do_ioctl(struct file *file, unsigned int cmd,
507 void __user *p, int compat_mode)
508{
509 struct evdev_client *client = file->private_data;
510 struct evdev *evdev = client->evdev;
511 struct input_dev *dev = evdev->handle.dev;
512 struct input_absinfo abs;
513 struct ff_effect effect;
514 int __user *ip = (int __user *)p;
515 int i, t, u, v;
516 int error;
517
518 switch (cmd) {
519
520 case EVIOCGVERSION:
521 return put_user(EV_VERSION, ip);
522
523 case EVIOCGID:
524 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
525 return -EFAULT;
526 return 0;
527
528 case EVIOCGREP:
529 if (!test_bit(EV_REP, dev->evbit))
530 return -ENOSYS;
531 if (put_user(dev->rep[REP_DELAY], ip))
532 return -EFAULT;
533 if (put_user(dev->rep[REP_PERIOD], ip + 1))
534 return -EFAULT;
535 return 0;
536
537 case EVIOCSREP:
538 if (!test_bit(EV_REP, dev->evbit))
539 return -ENOSYS;
540 if (get_user(u, ip))
541 return -EFAULT;
542 if (get_user(v, ip + 1))
543 return -EFAULT;
544
545 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
546 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
547
548 return 0;
549
550 case EVIOCGKEYCODE:
551 if (get_user(t, ip))
552 return -EFAULT;
553
554 error = input_get_keycode(dev, t, &v);
555 if (error)
556 return error;
557
558 if (put_user(v, ip + 1))
559 return -EFAULT;
560
561 return 0;
562
563 case EVIOCSKEYCODE:
564 if (get_user(t, ip) || get_user(v, ip + 1))
565 return -EFAULT;
566
567 return input_set_keycode(dev, t, v);
568
569 case EVIOCRMFF:
570 return input_ff_erase(dev, (int)(unsigned long) p, file);
571
572 case EVIOCGEFFECTS:
573 i = test_bit(EV_FF, dev->evbit) ?
574 dev->ff->max_effects : 0;
575 if (put_user(i, ip))
576 return -EFAULT;
577 return 0;
578
579 case EVIOCGRAB:
580 if (p)
581 return evdev_grab(evdev, client);
582 else
583 return evdev_ungrab(evdev, client);
584
585 default:
586
587 if (_IOC_TYPE(cmd) != 'E')
588 return -EINVAL;
589
590 if (_IOC_DIR(cmd) == _IOC_READ) {
591
592 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
593 return handle_eviocgbit(dev, cmd, p, compat_mode);
594
595 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
596 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
597 p, compat_mode);
598
599 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
600 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
601 p, compat_mode);
602
603 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
604 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
605 p, compat_mode);
606
607 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
608 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
609 p, compat_mode);
610
611 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
612 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
613
614 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
615 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
616
617 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
618 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
619
620 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
621
622 t = _IOC_NR(cmd) & ABS_MAX;
623
624 abs.value = dev->abs[t];
625 abs.minimum = dev->absmin[t];
626 abs.maximum = dev->absmax[t];
627 abs.fuzz = dev->absfuzz[t];
628 abs.flat = dev->absflat[t];
629 abs.resolution = dev->absres[t];
630
631 if (copy_to_user(p, &abs, min_t(size_t,
632 _IOC_SIZE(cmd),
633 sizeof(struct input_absinfo))))
634 return -EFAULT;
635
636 return 0;
637 }
638
639 }
640
641 if (_IOC_DIR(cmd) == _IOC_WRITE) {
642
643 if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
644
645 if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
646 return -EFAULT;
647
648 error = input_ff_upload(dev, &effect, file);
649
650 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
651 return -EFAULT;
652
653 return error;
654 }
655
656 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
657
658 t = _IOC_NR(cmd) & ABS_MAX;
659
660 if (copy_from_user(&abs, p, min_t(size_t,
661 _IOC_SIZE(cmd),
662 sizeof(struct input_absinfo))))
663 return -EFAULT;
664
665
666
667
668
669
670 spin_lock_irq(&dev->event_lock);
671
672 dev->abs[t] = abs.value;
673 dev->absmin[t] = abs.minimum;
674 dev->absmax[t] = abs.maximum;
675 dev->absfuzz[t] = abs.fuzz;
676 dev->absflat[t] = abs.flat;
677 dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
678 0 : abs.resolution;
679
680 spin_unlock_irq(&dev->event_lock);
681
682 return 0;
683 }
684 }
685 }
686 return -EINVAL;
687}
688
689static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
690 void __user *p, int compat_mode)
691{
692 struct evdev_client *client = file->private_data;
693 struct evdev *evdev = client->evdev;
694 int retval;
695
696 retval = mutex_lock_interruptible(&evdev->mutex);
697 if (retval)
698 return retval;
699
700 if (!evdev->exist) {
701 retval = -ENODEV;
702 goto out;
703 }
704
705 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
706
707 out:
708 mutex_unlock(&evdev->mutex);
709 return retval;
710}
711
712static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
713{
714 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
715}
716
717#ifdef CONFIG_COMPAT
718static long evdev_ioctl_compat(struct file *file,
719 unsigned int cmd, unsigned long arg)
720{
721 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
722}
723#endif
724
725static const struct file_operations evdev_fops = {
726 .owner = THIS_MODULE,
727 .read = evdev_read,
728 .write = evdev_write,
729 .poll = evdev_poll,
730 .open = evdev_open,
731 .release = evdev_release,
732 .unlocked_ioctl = evdev_ioctl,
733#ifdef CONFIG_COMPAT
734 .compat_ioctl = evdev_ioctl_compat,
735#endif
736 .fasync = evdev_fasync,
737 .flush = evdev_flush
738};
739
740static int evdev_install_chrdev(struct evdev *evdev)
741{
742
743
744
745
746 evdev_table[evdev->minor] = evdev;
747 return 0;
748}
749
750static void evdev_remove_chrdev(struct evdev *evdev)
751{
752
753
754
755 mutex_lock(&evdev_table_mutex);
756 evdev_table[evdev->minor] = NULL;
757 mutex_unlock(&evdev_table_mutex);
758}
759
760
761
762
763
764
765static void evdev_mark_dead(struct evdev *evdev)
766{
767 mutex_lock(&evdev->mutex);
768 evdev->exist = 0;
769 mutex_unlock(&evdev->mutex);
770}
771
772static void evdev_cleanup(struct evdev *evdev)
773{
774 struct input_handle *handle = &evdev->handle;
775
776 evdev_mark_dead(evdev);
777 evdev_hangup(evdev);
778 evdev_remove_chrdev(evdev);
779
780
781 if (evdev->open) {
782 input_flush_device(handle, NULL);
783 input_close_device(handle);
784 }
785}
786
787
788
789
790
791static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
792 const struct input_device_id *id)
793{
794 struct evdev *evdev;
795 int minor;
796 int error;
797
798 for (minor = 0; minor < EVDEV_MINORS; minor++)
799 if (!evdev_table[minor])
800 break;
801
802 if (minor == EVDEV_MINORS) {
803 printk(KERN_ERR "evdev: no more free evdev devices\n");
804 return -ENFILE;
805 }
806
807 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
808 if (!evdev)
809 return -ENOMEM;
810
811 INIT_LIST_HEAD(&evdev->client_list);
812 spin_lock_init(&evdev->client_lock);
813 mutex_init(&evdev->mutex);
814 init_waitqueue_head(&evdev->wait);
815
816 dev_set_name(&evdev->dev, "event%d", minor);
817 evdev->exist = 1;
818 evdev->minor = minor;
819
820 evdev->handle.dev = input_get_device(dev);
821 evdev->handle.name = dev_name(&evdev->dev);
822 evdev->handle.handler = handler;
823 evdev->handle.private = evdev;
824
825 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
826 evdev->dev.class = &input_class;
827 evdev->dev.parent = &dev->dev;
828 evdev->dev.release = evdev_free;
829 device_initialize(&evdev->dev);
830
831 error = input_register_handle(&evdev->handle);
832 if (error)
833 goto err_free_evdev;
834
835 error = evdev_install_chrdev(evdev);
836 if (error)
837 goto err_unregister_handle;
838
839 error = device_add(&evdev->dev);
840 if (error)
841 goto err_cleanup_evdev;
842
843 return 0;
844
845 err_cleanup_evdev:
846 evdev_cleanup(evdev);
847 err_unregister_handle:
848 input_unregister_handle(&evdev->handle);
849 err_free_evdev:
850 put_device(&evdev->dev);
851 return error;
852}
853
854static void evdev_disconnect(struct input_handle *handle)
855{
856 struct evdev *evdev = handle->private;
857
858 device_del(&evdev->dev);
859 evdev_cleanup(evdev);
860 input_unregister_handle(handle);
861 put_device(&evdev->dev);
862}
863
864static const struct input_device_id evdev_ids[] = {
865 { .driver_info = 1 },
866 { },
867};
868
869MODULE_DEVICE_TABLE(input, evdev_ids);
870
871static struct input_handler evdev_handler = {
872 .event = evdev_event,
873 .connect = evdev_connect,
874 .disconnect = evdev_disconnect,
875 .fops = &evdev_fops,
876 .minor = EVDEV_MINOR_BASE,
877 .name = "evdev",
878 .id_table = evdev_ids,
879};
880
881static int __init evdev_init(void)
882{
883 return input_register_handler(&evdev_handler);
884}
885
886static void __exit evdev_exit(void)
887{
888 input_unregister_handler(&evdev_handler);
889}
890
891module_init(evdev_init);
892module_exit(evdev_exit);
893
894MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
895MODULE_DESCRIPTION("Input driver event char devices");
896MODULE_LICENSE("GPL");
897
