Input: cannot refer to __exit from within __init.
[linux-2.6.git] / drivers / input / input.c
1 /*
2  * The input core
3  *
4  * Copyright (c) 1999-2002 Vojtech Pavlik
5  */
6
7 /*
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License version 2 as published by
10  * the Free Software Foundation.
11  */
12
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/smp_lock.h>
16 #include <linux/input.h>
17 #include <linux/module.h>
18 #include <linux/random.h>
19 #include <linux/major.h>
20 #include <linux/proc_fs.h>
21 #include <linux/kobject_uevent.h>
22 #include <linux/interrupt.h>
23 #include <linux/poll.h>
24 #include <linux/device.h>
25 #include <linux/devfs_fs_kernel.h>
26
27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
28 MODULE_DESCRIPTION("Input core");
29 MODULE_LICENSE("GPL");
30
31 EXPORT_SYMBOL(input_register_device);
32 EXPORT_SYMBOL(input_unregister_device);
33 EXPORT_SYMBOL(input_register_handler);
34 EXPORT_SYMBOL(input_unregister_handler);
35 EXPORT_SYMBOL(input_grab_device);
36 EXPORT_SYMBOL(input_release_device);
37 EXPORT_SYMBOL(input_open_device);
38 EXPORT_SYMBOL(input_close_device);
39 EXPORT_SYMBOL(input_accept_process);
40 EXPORT_SYMBOL(input_flush_device);
41 EXPORT_SYMBOL(input_event);
42 EXPORT_SYMBOL(input_class);
43
44 #define INPUT_DEVICES   256
45
46 static LIST_HEAD(input_dev_list);
47 static LIST_HEAD(input_handler_list);
48
49 static struct input_handler *input_table[8];
50
51 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
52 {
53         struct input_handle *handle;
54
55         if (type > EV_MAX || !test_bit(type, dev->evbit))
56                 return;
57
58         add_input_randomness(type, code, value);
59
60         switch (type) {
61
62                 case EV_SYN:
63                         switch (code) {
64                                 case SYN_CONFIG:
65                                         if (dev->event) dev->event(dev, type, code, value);
66                                         break;
67
68                                 case SYN_REPORT:
69                                         if (dev->sync) return;
70                                         dev->sync = 1;
71                                         break;
72                         }
73                         break;
74
75                 case EV_KEY:
76
77                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
78                                 return;
79
80                         if (value == 2)
81                                 break;
82
83                         change_bit(code, dev->key);
84
85                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
86                                 dev->repeat_key = code;
87                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
88                         }
89
90                         break;
91
92                 case EV_ABS:
93
94                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
95                                 return;
96
97                         if (dev->absfuzz[code]) {
98                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
99                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
100                                         return;
101
102                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
103                                     (value < dev->abs[code] + dev->absfuzz[code]))
104                                         value = (dev->abs[code] * 3 + value) >> 2;
105
106                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
107                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
108                                         value = (dev->abs[code] + value) >> 1;
109                         }
110
111                         if (dev->abs[code] == value)
112                                 return;
113
114                         dev->abs[code] = value;
115                         break;
116
117                 case EV_REL:
118
119                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
120                                 return;
121
122                         break;
123
124                 case EV_MSC:
125
126                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
127                                 return;
128
129                         if (dev->event) dev->event(dev, type, code, value);
130
131                         break;
132
133                 case EV_LED:
134
135                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
136                                 return;
137
138                         change_bit(code, dev->led);
139                         if (dev->event) dev->event(dev, type, code, value);
140
141                         break;
142
143                 case EV_SND:
144
145                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
146                                 return;
147
148                         if (dev->event) dev->event(dev, type, code, value);
149
150                         break;
151
152                 case EV_REP:
153
154                         if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
155
156                         dev->rep[code] = value;
157                         if (dev->event) dev->event(dev, type, code, value);
158
159                         break;
160
161                 case EV_FF:
162                         if (dev->event) dev->event(dev, type, code, value);
163                         break;
164         }
165
166         if (type != EV_SYN)
167                 dev->sync = 0;
168
169         if (dev->grab)
170                 dev->grab->handler->event(dev->grab, type, code, value);
171         else
172                 list_for_each_entry(handle, &dev->h_list, d_node)
173                         if (handle->open)
174                                 handle->handler->event(handle, type, code, value);
175 }
176
177 static void input_repeat_key(unsigned long data)
178 {
179         struct input_dev *dev = (void *) data;
180
181         if (!test_bit(dev->repeat_key, dev->key))
182                 return;
183
184         input_event(dev, EV_KEY, dev->repeat_key, 2);
185         input_sync(dev);
186
187         if (dev->rep[REP_PERIOD])
188                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
189 }
190
191 int input_accept_process(struct input_handle *handle, struct file *file)
192 {
193         if (handle->dev->accept)
194                 return handle->dev->accept(handle->dev, file);
195
196         return 0;
197 }
198
199 int input_grab_device(struct input_handle *handle)
200 {
201         if (handle->dev->grab)
202                 return -EBUSY;
203
204         handle->dev->grab = handle;
205         return 0;
206 }
207
208 void input_release_device(struct input_handle *handle)
209 {
210         if (handle->dev->grab == handle)
211                 handle->dev->grab = NULL;
212 }
213
214 int input_open_device(struct input_handle *handle)
215 {
216         struct input_dev *dev = handle->dev;
217         int err;
218
219         err = down_interruptible(&dev->sem);
220         if (err)
221                 return err;
222
223         handle->open++;
224
225         if (!dev->users++ && dev->open)
226                 err = dev->open(dev);
227
228         if (err)
229                 handle->open--;
230
231         up(&dev->sem);
232
233         return err;
234 }
235
236 int input_flush_device(struct input_handle* handle, struct file* file)
237 {
238         if (handle->dev->flush)
239                 return handle->dev->flush(handle->dev, file);
240
241         return 0;
242 }
243
244 void input_close_device(struct input_handle *handle)
245 {
246         struct input_dev *dev = handle->dev;
247
248         input_release_device(handle);
249
250         down(&dev->sem);
251
252         if (!--dev->users && dev->close)
253                 dev->close(dev);
254         handle->open--;
255
256         up(&dev->sem);
257 }
258
259 static void input_link_handle(struct input_handle *handle)
260 {
261         list_add_tail(&handle->d_node, &handle->dev->h_list);
262         list_add_tail(&handle->h_node, &handle->handler->h_list);
263 }
264
265 #define MATCH_BIT(bit, max) \
266                 for (i = 0; i < NBITS(max); i++) \
267                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
268                                 break; \
269                 if (i != NBITS(max)) \
270                         continue;
271
272 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
273 {
274         int i;
275
276         for (; id->flags || id->driver_info; id++) {
277
278                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
279                         if (id->id.bustype != dev->id.bustype)
280                                 continue;
281
282                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
283                         if (id->id.vendor != dev->id.vendor)
284                                 continue;
285
286                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
287                         if (id->id.product != dev->id.product)
288                                 continue;
289
290                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
291                         if (id->id.version != dev->id.version)
292                                 continue;
293
294                 MATCH_BIT(evbit,  EV_MAX);
295                 MATCH_BIT(keybit, KEY_MAX);
296                 MATCH_BIT(relbit, REL_MAX);
297                 MATCH_BIT(absbit, ABS_MAX);
298                 MATCH_BIT(mscbit, MSC_MAX);
299                 MATCH_BIT(ledbit, LED_MAX);
300                 MATCH_BIT(sndbit, SND_MAX);
301                 MATCH_BIT(ffbit,  FF_MAX);
302
303                 return id;
304         }
305
306         return NULL;
307 }
308
309
310 /*
311  * Input hotplugging interface - loading event handlers based on
312  * device bitfields.
313  */
314
315 #ifdef CONFIG_HOTPLUG
316
317 /*
318  * Input hotplugging invokes what /proc/sys/kernel/hotplug says
319  * (normally /sbin/hotplug) when input devices get added or removed.
320  *
321  * This invokes a user mode policy agent, typically helping to load driver
322  * or other modules, configure the device, and more.  Drivers can provide
323  * a MODULE_DEVICE_TABLE to help with module loading subtasks.
324  *
325  */
326
327 #define SPRINTF_BIT_A(bit, name, max) \
328         do { \
329                 envp[i++] = scratch; \
330                 scratch += sprintf(scratch, name); \
331                 for (j = NBITS(max) - 1; j >= 0; j--) \
332                         if (dev->bit[j]) break; \
333                 for (; j >= 0; j--) \
334                         scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
335                 scratch++; \
336         } while (0)
337
338 #define SPRINTF_BIT_A2(bit, name, max, ev) \
339         do { \
340                 if (test_bit(ev, dev->evbit)) \
341                         SPRINTF_BIT_A(bit, name, max); \
342         } while (0)
343
344 static void input_call_hotplug(char *verb, struct input_dev *dev)
345 {
346         char *argv[3], **envp, *buf, *scratch;
347         int i = 0, j, value;
348
349         if (!hotplug_path[0]) {
350                 printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
351                 return;
352         }
353         if (in_interrupt()) {
354                 printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
355                 return;
356         }
357         if (!current->fs->root) {
358                 printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
359                 return;
360         }
361         if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) {
362                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
363                 return;
364         }
365         if (!(buf = kmalloc(1024, GFP_KERNEL))) {
366                 kfree (envp);
367                 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
368                 return;
369         }
370
371         argv[0] = hotplug_path;
372         argv[1] = "input";
373         argv[2] = NULL;
374
375         envp[i++] = "HOME=/";
376         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
377
378         scratch = buf;
379
380         envp[i++] = scratch;
381         scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
382
383         envp[i++] = scratch;
384         scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
385                 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;
386
387         if (dev->name) {
388                 envp[i++] = scratch;
389                 scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
390         }
391
392         if (dev->phys) {
393                 envp[i++] = scratch;
394                 scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
395         }
396
397         SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
398         SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
399         SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
400         SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
401         SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
402         SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
403         SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
404         SPRINTF_BIT_A2(ffbit,  "FF=",  FF_MAX, EV_FF);
405
406         envp[i++] = NULL;
407
408 #ifdef INPUT_DEBUG
409         printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
410                 argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
411 #endif
412
413         value = call_usermodehelper(argv [0], argv, envp, 0);
414
415         kfree(buf);
416         kfree(envp);
417
418 #ifdef INPUT_DEBUG
419         if (value != 0)
420                 printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
421 #endif
422 }
423
424 #endif
425
426 #ifdef CONFIG_PROC_FS
427
428 static struct proc_dir_entry *proc_bus_input_dir;
429 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
430 static int input_devices_state;
431
432 static inline void input_wakeup_procfs_readers(void)
433 {
434         input_devices_state++;
435         wake_up(&input_devices_poll_wait);
436 }
437
438 static unsigned int input_devices_poll(struct file *file, poll_table *wait)
439 {
440         int state = input_devices_state;
441         poll_wait(file, &input_devices_poll_wait, wait);
442         if (state != input_devices_state)
443                 return POLLIN | POLLRDNORM;
444         return 0;
445 }
446
447 #define SPRINTF_BIT_B(bit, name, max) \
448         do { \
449                 len += sprintf(buf + len, "B: %s", name); \
450                 for (i = NBITS(max) - 1; i >= 0; i--) \
451                         if (dev->bit[i]) break; \
452                 for (; i >= 0; i--) \
453                         len += sprintf(buf + len, "%lx ", dev->bit[i]); \
454                 len += sprintf(buf + len, "\n"); \
455         } while (0)
456
457 #define SPRINTF_BIT_B2(bit, name, max, ev) \
458         do { \
459                 if (test_bit(ev, dev->evbit)) \
460                         SPRINTF_BIT_B(bit, name, max); \
461         } while (0)
462
463 static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
464 {
465         struct input_dev *dev;
466         struct input_handle *handle;
467
468         off_t at = 0;
469         int i, len, cnt = 0;
470
471         list_for_each_entry(dev, &input_dev_list, node) {
472
473                 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
474                         dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
475
476                 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
477                 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
478                 len += sprintf(buf + len, "H: Handlers=");
479
480                 list_for_each_entry(handle, &dev->h_list, d_node)
481                         len += sprintf(buf + len, "%s ", handle->name);
482
483                 len += sprintf(buf + len, "\n");
484
485                 SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
486                 SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
487                 SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
488                 SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
489                 SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
490                 SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
491                 SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
492                 SPRINTF_BIT_B2(ffbit,  "FF=",  FF_MAX, EV_FF);
493
494                 len += sprintf(buf + len, "\n");
495
496                 at += len;
497
498                 if (at >= pos) {
499                         if (!*start) {
500                                 *start = buf + (pos - (at - len));
501                                 cnt = at - pos;
502                         } else  cnt += len;
503                         buf += len;
504                         if (cnt >= count)
505                                 break;
506                 }
507         }
508
509         if (&dev->node == &input_dev_list)
510                 *eof = 1;
511
512         return (count > cnt) ? cnt : count;
513 }
514
515 static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
516 {
517         struct input_handler *handler;
518
519         off_t at = 0;
520         int len = 0, cnt = 0;
521         int i = 0;
522
523         list_for_each_entry(handler, &input_handler_list, node) {
524
525                 if (handler->fops)
526                         len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
527                                 i++, handler->name, handler->minor);
528                 else
529                         len = sprintf(buf, "N: Number=%d Name=%s\n",
530                                 i++, handler->name);
531
532                 at += len;
533
534                 if (at >= pos) {
535                         if (!*start) {
536                                 *start = buf + (pos - (at - len));
537                                 cnt = at - pos;
538                         } else  cnt += len;
539                         buf += len;
540                         if (cnt >= count)
541                                 break;
542                 }
543         }
544         if (&handler->node == &input_handler_list)
545                 *eof = 1;
546
547         return (count > cnt) ? cnt : count;
548 }
549
550 static struct file_operations input_fileops;
551
552 static int __init input_proc_init(void)
553 {
554         struct proc_dir_entry *entry;
555
556         proc_bus_input_dir = proc_mkdir("input", proc_bus);
557         if (!proc_bus_input_dir)
558                 return -ENOMEM;
559
560         proc_bus_input_dir->owner = THIS_MODULE;
561
562         entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
563         if (!entry)
564                 goto fail1;
565
566         entry->owner = THIS_MODULE;
567         input_fileops = *entry->proc_fops;
568         entry->proc_fops = &input_fileops;
569         entry->proc_fops->poll = input_devices_poll;
570
571         entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
572         if (!entry)
573                 goto fail2;
574
575         entry->owner = THIS_MODULE;
576
577         return 0;
578
579  fail2: remove_proc_entry("devices", proc_bus_input_dir);
580  fail1: remove_proc_entry("input", proc_bus);
581         return -ENOMEM;
582 }
583
584 static void input_proc_exit(void)
585 {
586         remove_proc_entry("devices", proc_bus_input_dir);
587         remove_proc_entry("handlers", proc_bus_input_dir);
588         remove_proc_entry("input", proc_bus);
589 }
590
591 #else /* !CONFIG_PROC_FS */
592 static inline void input_wakeup_procfs_readers(void) { }
593 static inline int input_proc_init(void) { return 0; }
594 static inline void input_proc_exit(void) { }
595 #endif
596
597 void input_register_device(struct input_dev *dev)
598 {
599         struct input_handle *handle;
600         struct input_handler *handler;
601         struct input_device_id *id;
602
603         set_bit(EV_SYN, dev->evbit);
604
605         init_MUTEX(&dev->sem);
606
607         /*
608          * If delay and period are pre-set by the driver, then autorepeating
609          * is handled by the driver itself and we don't do it in input.c.
610          */
611
612         init_timer(&dev->timer);
613         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
614                 dev->timer.data = (long) dev;
615                 dev->timer.function = input_repeat_key;
616                 dev->rep[REP_DELAY] = 250;
617                 dev->rep[REP_PERIOD] = 33;
618         }
619
620         INIT_LIST_HEAD(&dev->h_list);
621         list_add_tail(&dev->node, &input_dev_list);
622
623         list_for_each_entry(handler, &input_handler_list, node)
624                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
625                         if ((id = input_match_device(handler->id_table, dev)))
626                                 if ((handle = handler->connect(handler, dev, id)))
627                                         input_link_handle(handle);
628
629 #ifdef CONFIG_HOTPLUG
630         input_call_hotplug("add", dev);
631 #endif
632
633         input_wakeup_procfs_readers();
634 }
635
636 void input_unregister_device(struct input_dev *dev)
637 {
638         struct list_head * node, * next;
639
640         if (!dev) return;
641
642         del_timer_sync(&dev->timer);
643
644         list_for_each_safe(node, next, &dev->h_list) {
645                 struct input_handle * handle = to_handle(node);
646                 list_del_init(&handle->d_node);
647                 list_del_init(&handle->h_node);
648                 handle->handler->disconnect(handle);
649         }
650
651 #ifdef CONFIG_HOTPLUG
652         input_call_hotplug("remove", dev);
653 #endif
654
655         list_del_init(&dev->node);
656
657         input_wakeup_procfs_readers();
658 }
659
660 void input_register_handler(struct input_handler *handler)
661 {
662         struct input_dev *dev;
663         struct input_handle *handle;
664         struct input_device_id *id;
665
666         if (!handler) return;
667
668         INIT_LIST_HEAD(&handler->h_list);
669
670         if (handler->fops != NULL)
671                 input_table[handler->minor >> 5] = handler;
672
673         list_add_tail(&handler->node, &input_handler_list);
674
675         list_for_each_entry(dev, &input_dev_list, node)
676                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
677                         if ((id = input_match_device(handler->id_table, dev)))
678                                 if ((handle = handler->connect(handler, dev, id)))
679                                         input_link_handle(handle);
680
681         input_wakeup_procfs_readers();
682 }
683
684 void input_unregister_handler(struct input_handler *handler)
685 {
686         struct list_head * node, * next;
687
688         list_for_each_safe(node, next, &handler->h_list) {
689                 struct input_handle * handle = to_handle_h(node);
690                 list_del_init(&handle->h_node);
691                 list_del_init(&handle->d_node);
692                 handler->disconnect(handle);
693         }
694
695         list_del_init(&handler->node);
696
697         if (handler->fops != NULL)
698                 input_table[handler->minor >> 5] = NULL;
699
700         input_wakeup_procfs_readers();
701 }
702
703 static int input_open_file(struct inode *inode, struct file *file)
704 {
705         struct input_handler *handler = input_table[iminor(inode) >> 5];
706         struct file_operations *old_fops, *new_fops = NULL;
707         int err;
708
709         /* No load-on-demand here? */
710         if (!handler || !(new_fops = fops_get(handler->fops)))
711                 return -ENODEV;
712
713         /*
714          * That's _really_ odd. Usually NULL ->open means "nothing special",
715          * not "no device". Oh, well...
716          */
717         if (!new_fops->open) {
718                 fops_put(new_fops);
719                 return -ENODEV;
720         }
721         old_fops = file->f_op;
722         file->f_op = new_fops;
723
724         err = new_fops->open(inode, file);
725
726         if (err) {
727                 fops_put(file->f_op);
728                 file->f_op = fops_get(old_fops);
729         }
730         fops_put(old_fops);
731         return err;
732 }
733
734 static struct file_operations input_fops = {
735         .owner = THIS_MODULE,
736         .open = input_open_file,
737 };
738
739 struct class *input_class;
740
741 static int __init input_init(void)
742 {
743         int err;
744
745         input_class = class_create(THIS_MODULE, "input");
746         if (IS_ERR(input_class)) {
747                 printk(KERN_ERR "input: unable to register input class\n");
748                 return PTR_ERR(input_class);
749         }
750
751         err = input_proc_init();
752         if (err)
753                 goto fail1;
754
755         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
756         if (err) {
757                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
758                 goto fail2;
759         }
760
761         err = devfs_mk_dir("input");
762         if (err)
763                 goto fail3;
764
765         return 0;
766
767  fail3: unregister_chrdev(INPUT_MAJOR, "input");
768  fail2: input_proc_exit();
769  fail1: class_destroy(input_class);
770         return err;
771 }
772
773 static void __exit input_exit(void)
774 {
775         input_proc_exit();
776         devfs_remove("input");
777         unregister_chrdev(INPUT_MAJOR, "input");
778         class_destroy(input_class);
779 }
780
781 subsys_initcall(input_init);
782 module_exit(input_exit);