Rationalize fasync return values
[linux-2.6.git] / drivers / input / evdev.c
1 /*
2  * Event char devices, giving access to raw input device events.
3  *
4  * Copyright (c) 1999-2002 Vojtech Pavlik
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License version 2 as published by
8  * the Free Software Foundation.
9  */
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/slab.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/input.h>
20 #include <linux/major.h>
21 #include <linux/device.h>
22 #include "input-compat.h"
23
24 struct evdev {
25         int exist;
26         int open;
27         int minor;
28         char name[16];
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; /* protects client_list */
34         struct mutex mutex;
35         struct device dev;
36 };
37
38 struct evdev_client {
39         struct input_event buffer[EVDEV_BUFFER_SIZE];
40         int head;
41         int tail;
42         spinlock_t buffer_lock; /* protects access to buffer, head and tail */
43         struct fasync_struct *fasync;
44         struct evdev *evdev;
45         struct list_head node;
46 };
47
48 static struct evdev *evdev_table[EVDEV_MINORS];
49 static DEFINE_MUTEX(evdev_table_mutex);
50
51 static void evdev_pass_event(struct evdev_client *client,
52                              struct input_event *event)
53 {
54         /*
55          * Interrupts are disabled, just acquire the lock
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  * Pass incoming event to all connected clients.
67  */
68 static 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
94 static 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
101 static 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
120 static 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  * Grabs an event device (along with underlying input device).
130  * This function is called with evdev->mutex taken.
131  */
132 static 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
149 static 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
161 static 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
170 static 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
179 static 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
199 static 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  * Wake up users waiting for IO so they can disconnect from
211  * dead device.
212  */
213 static 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
225 static 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
244 static 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
290 static 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
324 static 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
342 static 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 /* No kernel lock - fine */
378 static 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
394 static 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
422 static 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 /* __BIG_ENDIAN */
435
436 #else
437
438 static 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 /* CONFIG_COMPAT */
450
451 static 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
466 static 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          * Work around bugs in userspace programs that like to do
488          * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
489          * should be in bytes, not in bits.
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
506 static 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
630                                 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
631                                         return -EFAULT;
632
633                                 return 0;
634                         }
635
636                 }
637
638                 if (_IOC_DIR(cmd) == _IOC_WRITE) {
639
640                         if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
641
642                                 if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
643                                         return -EFAULT;
644
645                                 error = input_ff_upload(dev, &effect, file);
646
647                                 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
648                                         return -EFAULT;
649
650                                 return error;
651                         }
652
653                         if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
654
655                                 t = _IOC_NR(cmd) & ABS_MAX;
656
657                                 if (copy_from_user(&abs, p,
658                                                 sizeof(struct input_absinfo)))
659                                         return -EFAULT;
660
661                                 /*
662                                  * Take event lock to ensure that we are not
663                                  * changing device parameters in the middle
664                                  * of event.
665                                  */
666                                 spin_lock_irq(&dev->event_lock);
667
668                                 dev->abs[t] = abs.value;
669                                 dev->absmin[t] = abs.minimum;
670                                 dev->absmax[t] = abs.maximum;
671                                 dev->absfuzz[t] = abs.fuzz;
672                                 dev->absflat[t] = abs.flat;
673
674                                 spin_unlock_irq(&dev->event_lock);
675
676                                 return 0;
677                         }
678                 }
679         }
680         return -EINVAL;
681 }
682
683 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
684                                 void __user *p, int compat_mode)
685 {
686         struct evdev_client *client = file->private_data;
687         struct evdev *evdev = client->evdev;
688         int retval;
689
690         retval = mutex_lock_interruptible(&evdev->mutex);
691         if (retval)
692                 return retval;
693
694         if (!evdev->exist) {
695                 retval = -ENODEV;
696                 goto out;
697         }
698
699         retval = evdev_do_ioctl(file, cmd, p, compat_mode);
700
701  out:
702         mutex_unlock(&evdev->mutex);
703         return retval;
704 }
705
706 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
707 {
708         return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
709 }
710
711 #ifdef CONFIG_COMPAT
712 static long evdev_ioctl_compat(struct file *file,
713                                 unsigned int cmd, unsigned long arg)
714 {
715         return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
716 }
717 #endif
718
719 static const struct file_operations evdev_fops = {
720         .owner          = THIS_MODULE,
721         .read           = evdev_read,
722         .write          = evdev_write,
723         .poll           = evdev_poll,
724         .open           = evdev_open,
725         .release        = evdev_release,
726         .unlocked_ioctl = evdev_ioctl,
727 #ifdef CONFIG_COMPAT
728         .compat_ioctl   = evdev_ioctl_compat,
729 #endif
730         .fasync         = evdev_fasync,
731         .flush          = evdev_flush
732 };
733
734 static int evdev_install_chrdev(struct evdev *evdev)
735 {
736         /*
737          * No need to do any locking here as calls to connect and
738          * disconnect are serialized by the input core
739          */
740         evdev_table[evdev->minor] = evdev;
741         return 0;
742 }
743
744 static void evdev_remove_chrdev(struct evdev *evdev)
745 {
746         /*
747          * Lock evdev table to prevent race with evdev_open()
748          */
749         mutex_lock(&evdev_table_mutex);
750         evdev_table[evdev->minor] = NULL;
751         mutex_unlock(&evdev_table_mutex);
752 }
753
754 /*
755  * Mark device non-existent. This disables writes, ioctls and
756  * prevents new users from opening the device. Already posted
757  * blocking reads will stay, however new ones will fail.
758  */
759 static void evdev_mark_dead(struct evdev *evdev)
760 {
761         mutex_lock(&evdev->mutex);
762         evdev->exist = 0;
763         mutex_unlock(&evdev->mutex);
764 }
765
766 static void evdev_cleanup(struct evdev *evdev)
767 {
768         struct input_handle *handle = &evdev->handle;
769
770         evdev_mark_dead(evdev);
771         evdev_hangup(evdev);
772         evdev_remove_chrdev(evdev);
773
774         /* evdev is marked dead so no one else accesses evdev->open */
775         if (evdev->open) {
776                 input_flush_device(handle, NULL);
777                 input_close_device(handle);
778         }
779 }
780
781 /*
782  * Create new evdev device. Note that input core serializes calls
783  * to connect and disconnect so we don't need to lock evdev_table here.
784  */
785 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
786                          const struct input_device_id *id)
787 {
788         struct evdev *evdev;
789         int minor;
790         int error;
791
792         for (minor = 0; minor < EVDEV_MINORS; minor++)
793                 if (!evdev_table[minor])
794                         break;
795
796         if (minor == EVDEV_MINORS) {
797                 printk(KERN_ERR "evdev: no more free evdev devices\n");
798                 return -ENFILE;
799         }
800
801         evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
802         if (!evdev)
803                 return -ENOMEM;
804
805         INIT_LIST_HEAD(&evdev->client_list);
806         spin_lock_init(&evdev->client_lock);
807         mutex_init(&evdev->mutex);
808         init_waitqueue_head(&evdev->wait);
809
810         snprintf(evdev->name, sizeof(evdev->name), "event%d", minor);
811         evdev->exist = 1;
812         evdev->minor = minor;
813
814         evdev->handle.dev = input_get_device(dev);
815         evdev->handle.name = evdev->name;
816         evdev->handle.handler = handler;
817         evdev->handle.private = evdev;
818
819         dev_set_name(&evdev->dev, evdev->name);
820         evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
821         evdev->dev.class = &input_class;
822         evdev->dev.parent = &dev->dev;
823         evdev->dev.release = evdev_free;
824         device_initialize(&evdev->dev);
825
826         error = input_register_handle(&evdev->handle);
827         if (error)
828                 goto err_free_evdev;
829
830         error = evdev_install_chrdev(evdev);
831         if (error)
832                 goto err_unregister_handle;
833
834         error = device_add(&evdev->dev);
835         if (error)
836                 goto err_cleanup_evdev;
837
838         return 0;
839
840  err_cleanup_evdev:
841         evdev_cleanup(evdev);
842  err_unregister_handle:
843         input_unregister_handle(&evdev->handle);
844  err_free_evdev:
845         put_device(&evdev->dev);
846         return error;
847 }
848
849 static void evdev_disconnect(struct input_handle *handle)
850 {
851         struct evdev *evdev = handle->private;
852
853         device_del(&evdev->dev);
854         evdev_cleanup(evdev);
855         input_unregister_handle(handle);
856         put_device(&evdev->dev);
857 }
858
859 static const struct input_device_id evdev_ids[] = {
860         { .driver_info = 1 },   /* Matches all devices */
861         { },                    /* Terminating zero entry */
862 };
863
864 MODULE_DEVICE_TABLE(input, evdev_ids);
865
866 static struct input_handler evdev_handler = {
867         .event          = evdev_event,
868         .connect        = evdev_connect,
869         .disconnect     = evdev_disconnect,
870         .fops           = &evdev_fops,
871         .minor          = EVDEV_MINOR_BASE,
872         .name           = "evdev",
873         .id_table       = evdev_ids,
874 };
875
876 static int __init evdev_init(void)
877 {
878         return input_register_handler(&evdev_handler);
879 }
880
881 static void __exit evdev_exit(void)
882 {
883         input_unregister_handler(&evdev_handler);
884 }
885
886 module_init(evdev_init);
887 module_exit(evdev_exit);
888
889 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
890 MODULE_DESCRIPTION("Input driver event char devices");
891 MODULE_LICENSE("GPL");