projects/linux·blob v2.6.14 · refs

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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
27MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
28MODULE_DESCRIPTION("Input core");
29MODULE_LICENSE("GPL");
30
31EXPORT_SYMBOL(input_register_device);
32EXPORT_SYMBOL(input_unregister_device);
33EXPORT_SYMBOL(input_register_handler);
34EXPORT_SYMBOL(input_unregister_handler);
35EXPORT_SYMBOL(input_grab_device);
36EXPORT_SYMBOL(input_release_device);
37EXPORT_SYMBOL(input_open_device);
38EXPORT_SYMBOL(input_close_device);
39EXPORT_SYMBOL(input_accept_process);
40EXPORT_SYMBOL(input_flush_device);
41EXPORT_SYMBOL(input_event);
42EXPORT_SYMBOL(input_class);
43
44#define INPUT_DEVICES 256
45
46static LIST_HEAD(input_dev_list);
47static LIST_HEAD(input_handler_list);
48
49static struct input_handler *input_table[8];
50
51void 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_SW:
93
94 if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
95 return;
96
97 change_bit(code, dev->sw);
98
99 break;
100
101 case EV_ABS:
102
103 if (code > ABS_MAX || !test_bit(code, dev->absbit))
104 return;
105
106 if (dev->absfuzz[code]) {
107 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
108 (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
109 return;
110
111 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
112 (value < dev->abs[code] + dev->absfuzz[code]))
113 value = (dev->abs[code] * 3 + value) >> 2;
114
115 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
116 (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
117 value = (dev->abs[code] + value) >> 1;
118 }
119
120 if (dev->abs[code] == value)
121 return;
122
123 dev->abs[code] = value;
124 break;
125
126 case EV_REL:
127
128 if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
129 return;
130
131 break;
132
133 case EV_MSC:
134
135 if (code > MSC_MAX || !test_bit(code, dev->mscbit))
136 return;
137
138 if (dev->event) dev->event(dev, type, code, value);
139
140 break;
141
142 case EV_LED:
143
144 if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
145 return;
146
147 change_bit(code, dev->led);
148 if (dev->event) dev->event(dev, type, code, value);
149
150 break;
151
152 case EV_SND:
153
154 if (code > SND_MAX || !test_bit(code, dev->sndbit))
155 return;
156
157 if (dev->event) dev->event(dev, type, code, value);
158
159 break;
160
161 case EV_REP:
162
163 if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
164
165 dev->rep[code] = value;
166 if (dev->event) dev->event(dev, type, code, value);
167
168 break;
169
170 case EV_FF:
171 if (dev->event) dev->event(dev, type, code, value);
172 break;
173 }
174
175 if (type != EV_SYN)
176 dev->sync = 0;
177
178 if (dev->grab)
179 dev->grab->handler->event(dev->grab, type, code, value);
180 else
181 list_for_each_entry(handle, &dev->h_list, d_node)
182 if (handle->open)
183 handle->handler->event(handle, type, code, value);
184}
185
186static void input_repeat_key(unsigned long data)
187{
188 struct input_dev *dev = (void *) data;
189
190 if (!test_bit(dev->repeat_key, dev->key))
191 return;
192
193 input_event(dev, EV_KEY, dev->repeat_key, 2);
194 input_sync(dev);
195
196 if (dev->rep[REP_PERIOD])
197 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
198}
199
200int input_accept_process(struct input_handle *handle, struct file *file)
201{
202 if (handle->dev->accept)
203 return handle->dev->accept(handle->dev, file);
204
205 return 0;
206}
207
208int input_grab_device(struct input_handle *handle)
209{
210 if (handle->dev->grab)
211 return -EBUSY;
212
213 handle->dev->grab = handle;
214 return 0;
215}
216
217void input_release_device(struct input_handle *handle)
218{
219 if (handle->dev->grab == handle)
220 handle->dev->grab = NULL;
221}
222
223int input_open_device(struct input_handle *handle)
224{
225 struct input_dev *dev = handle->dev;
226 int err;
227
228 err = down_interruptible(&dev->sem);
229 if (err)
230 return err;
231
232 handle->open++;
233
234 if (!dev->users++ && dev->open)
235 err = dev->open(dev);
236
237 if (err)
238 handle->open--;
239
240 up(&dev->sem);
241
242 return err;
243}
244
245int input_flush_device(struct input_handle* handle, struct file* file)
246{
247 if (handle->dev->flush)
248 return handle->dev->flush(handle->dev, file);
249
250 return 0;
251}
252
253void input_close_device(struct input_handle *handle)
254{
255 struct input_dev *dev = handle->dev;
256
257 input_release_device(handle);
258
259 down(&dev->sem);
260
261 if (!--dev->users && dev->close)
262 dev->close(dev);
263 handle->open--;
264
265 up(&dev->sem);
266}
267
268static void input_link_handle(struct input_handle *handle)
269{
270 list_add_tail(&handle->d_node, &handle->dev->h_list);
271 list_add_tail(&handle->h_node, &handle->handler->h_list);
272}
273
274#define MATCH_BIT(bit, max) \
275 for (i = 0; i < NBITS(max); i++) \
276 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
277 break; \
278 if (i != NBITS(max)) \
279 continue;
280
281static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
282{
283 int i;
284
285 for (; id->flags || id->driver_info; id++) {
286
287 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
288 if (id->id.bustype != dev->id.bustype)
289 continue;
290
291 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
292 if (id->id.vendor != dev->id.vendor)
293 continue;
294
295 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
296 if (id->id.product != dev->id.product)
297 continue;
298
299 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
300 if (id->id.version != dev->id.version)
301 continue;
302
303 MATCH_BIT(evbit, EV_MAX);
304 MATCH_BIT(keybit, KEY_MAX);
305 MATCH_BIT(relbit, REL_MAX);
306 MATCH_BIT(absbit, ABS_MAX);
307 MATCH_BIT(mscbit, MSC_MAX);
308 MATCH_BIT(ledbit, LED_MAX);
309 MATCH_BIT(sndbit, SND_MAX);
310 MATCH_BIT(ffbit, FF_MAX);
311 MATCH_BIT(swbit, SW_MAX);
312
313 return id;
314 }
315
316 return NULL;
317}
318
319
320/*
321 * Input hotplugging interface - loading event handlers based on
322 * device bitfields.
323 */
324
325#ifdef CONFIG_HOTPLUG
326
327/*
328 * Input hotplugging invokes what /proc/sys/kernel/hotplug says
329 * (normally /sbin/hotplug) when input devices get added or removed.
330 *
331 * This invokes a user mode policy agent, typically helping to load driver
332 * or other modules, configure the device, and more. Drivers can provide
333 * a MODULE_DEVICE_TABLE to help with module loading subtasks.
334 *
335 */
336
337#define SPRINTF_BIT_A(bit, name, max) \
338 do { \
339 envp[i++] = scratch; \
340 scratch += sprintf(scratch, name); \
341 for (j = NBITS(max) - 1; j >= 0; j--) \
342 if (dev->bit[j]) break; \
343 for (; j >= 0; j--) \
344 scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
345 scratch++; \
346 } while (0)
347
348#define SPRINTF_BIT_A2(bit, name, max, ev) \
349 do { \
350 if (test_bit(ev, dev->evbit)) \
351 SPRINTF_BIT_A(bit, name, max); \
352 } while (0)
353
354static void input_call_hotplug(char *verb, struct input_dev *dev)
355{
356 char *argv[3], **envp, *buf, *scratch;
357 int i = 0, j, value;
358
359 if (!hotplug_path[0]) {
360 printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
361 return;
362 }
363 if (in_interrupt()) {
364 printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
365 return;
366 }
367 if (!current->fs->root) {
368 printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
369 return;
370 }
371 if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) {
372 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
373 return;
374 }
375 if (!(buf = kmalloc(1024, GFP_KERNEL))) {
376 kfree (envp);
377 printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
378 return;
379 }
380
381 argv[0] = hotplug_path;
382 argv[1] = "input";
383 argv[2] = NULL;
384
385 envp[i++] = "HOME=/";
386 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
387
388 scratch = buf;
389
390 envp[i++] = scratch;
391 scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
392
393 envp[i++] = scratch;
394 scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
395 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;
396
397 if (dev->name) {
398 envp[i++] = scratch;
399 scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
400 }
401
402 if (dev->phys) {
403 envp[i++] = scratch;
404 scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
405 }
406
407 SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
408 SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
409 SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
410 SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
411 SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
412 SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
413 SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
414 SPRINTF_BIT_A2(ffbit, "FF=", FF_MAX, EV_FF);
415 SPRINTF_BIT_A2(swbit, "SW=", SW_MAX, EV_SW);
416
417 envp[i++] = NULL;
418
419#ifdef INPUT_DEBUG
420 printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
421 argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
422#endif
423
424 value = call_usermodehelper(argv [0], argv, envp, 0);
425
426 kfree(buf);
427 kfree(envp);
428
429#ifdef INPUT_DEBUG
430 if (value != 0)
431 printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
432#endif
433}
434
435#endif
436
437#ifdef CONFIG_PROC_FS
438
439static struct proc_dir_entry *proc_bus_input_dir;
440static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
441static int input_devices_state;
442
443static inline void input_wakeup_procfs_readers(void)
444{
445 input_devices_state++;
446 wake_up(&input_devices_poll_wait);
447}
448
449static unsigned int input_devices_poll(struct file *file, poll_table *wait)
450{
451 int state = input_devices_state;
452 poll_wait(file, &input_devices_poll_wait, wait);
453 if (state != input_devices_state)
454 return POLLIN | POLLRDNORM;
455 return 0;
456}
457
458#define SPRINTF_BIT_B(bit, name, max) \
459 do { \
460 len += sprintf(buf + len, "B: %s", name); \
461 for (i = NBITS(max) - 1; i >= 0; i--) \
462 if (dev->bit[i]) break; \
463 for (; i >= 0; i--) \
464 len += sprintf(buf + len, "%lx ", dev->bit[i]); \
465 len += sprintf(buf + len, "\n"); \
466 } while (0)
467
468#define SPRINTF_BIT_B2(bit, name, max, ev) \
469 do { \
470 if (test_bit(ev, dev->evbit)) \
471 SPRINTF_BIT_B(bit, name, max); \
472 } while (0)
473
474static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
475{
476 struct input_dev *dev;
477 struct input_handle *handle;
478
479 off_t at = 0;
480 int i, len, cnt = 0;
481
482 list_for_each_entry(dev, &input_dev_list, node) {
483
484 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
485 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
486
487 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
488 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
489 len += sprintf(buf + len, "H: Handlers=");
490
491 list_for_each_entry(handle, &dev->h_list, d_node)
492 len += sprintf(buf + len, "%s ", handle->name);
493
494 len += sprintf(buf + len, "\n");
495
496 SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
497 SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
498 SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
499 SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
500 SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
501 SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
502 SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
503 SPRINTF_BIT_B2(ffbit, "FF=", FF_MAX, EV_FF);
504 SPRINTF_BIT_B2(swbit, "SW=", SW_MAX, EV_SW);
505
506 len += sprintf(buf + len, "\n");
507
508 at += len;
509
510 if (at >= pos) {
511 if (!*start) {
512 *start = buf + (pos - (at - len));
513 cnt = at - pos;
514 } else cnt += len;
515 buf += len;
516 if (cnt >= count)
517 break;
518 }
519 }
520
521 if (&dev->node == &input_dev_list)
522 *eof = 1;
523
524 return (count > cnt) ? cnt : count;
525}
526
527static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
528{
529 struct input_handler *handler;
530
531 off_t at = 0;
532 int len = 0, cnt = 0;
533 int i = 0;
534
535 list_for_each_entry(handler, &input_handler_list, node) {
536
537 if (handler->fops)
538 len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
539 i++, handler->name, handler->minor);
540 else
541 len = sprintf(buf, "N: Number=%d Name=%s\n",
542 i++, handler->name);
543
544 at += len;
545
546 if (at >= pos) {
547 if (!*start) {
548 *start = buf + (pos - (at - len));
549 cnt = at - pos;
550 } else cnt += len;
551 buf += len;
552 if (cnt >= count)
553 break;
554 }
555 }
556 if (&handler->node == &input_handler_list)
557 *eof = 1;
558
559 return (count > cnt) ? cnt : count;
560}
561
562static struct file_operations input_fileops;
563
564static int __init input_proc_init(void)
565{
566 struct proc_dir_entry *entry;
567
568 proc_bus_input_dir = proc_mkdir("input", proc_bus);
569 if (!proc_bus_input_dir)
570 return -ENOMEM;
571
572 proc_bus_input_dir->owner = THIS_MODULE;
573
574 entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
575 if (!entry)
576 goto fail1;
577
578 entry->owner = THIS_MODULE;
579 input_fileops = *entry->proc_fops;
580 entry->proc_fops = &input_fileops;
581 entry->proc_fops->poll = input_devices_poll;
582
583 entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
584 if (!entry)
585 goto fail2;
586
587 entry->owner = THIS_MODULE;
588
589 return 0;
590
591 fail2: remove_proc_entry("devices", proc_bus_input_dir);
592 fail1: remove_proc_entry("input", proc_bus);
593 return -ENOMEM;
594}
595
596static void input_proc_exit(void)
597{
598 remove_proc_entry("devices", proc_bus_input_dir);
599 remove_proc_entry("handlers", proc_bus_input_dir);
600 remove_proc_entry("input", proc_bus);
601}
602
603#else /* !CONFIG_PROC_FS */
604static inline void input_wakeup_procfs_readers(void) { }
605static inline int input_proc_init(void) { return 0; }
606static inline void input_proc_exit(void) { }
607#endif
608
609void input_register_device(struct input_dev *dev)
610{
611 struct input_handle *handle;
612 struct input_handler *handler;
613 struct input_device_id *id;
614
615 set_bit(EV_SYN, dev->evbit);
616
617 init_MUTEX(&dev->sem);
618
619 /*
620 * If delay and period are pre-set by the driver, then autorepeating
621 * is handled by the driver itself and we don't do it in input.c.
622 */
623
624 init_timer(&dev->timer);
625 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
626 dev->timer.data = (long) dev;
627 dev->timer.function = input_repeat_key;
628 dev->rep[REP_DELAY] = 250;
629 dev->rep[REP_PERIOD] = 33;
630 }
631
632 INIT_LIST_HEAD(&dev->h_list);
633 list_add_tail(&dev->node, &input_dev_list);
634
635 list_for_each_entry(handler, &input_handler_list, node)
636 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
637 if ((id = input_match_device(handler->id_table, dev)))
638 if ((handle = handler->connect(handler, dev, id)))
639 input_link_handle(handle);
640
641#ifdef CONFIG_HOTPLUG
642 input_call_hotplug("add", dev);
643#endif
644
645 input_wakeup_procfs_readers();
646}
647
648void input_unregister_device(struct input_dev *dev)
649{
650 struct list_head * node, * next;
651
652 if (!dev) return;
653
654 del_timer_sync(&dev->timer);
655
656 list_for_each_safe(node, next, &dev->h_list) {
657 struct input_handle * handle = to_handle(node);
658 list_del_init(&handle->d_node);
659 list_del_init(&handle->h_node);
660 handle->handler->disconnect(handle);
661 }
662
663#ifdef CONFIG_HOTPLUG
664 input_call_hotplug("remove", dev);
665#endif
666
667 list_del_init(&dev->node);
668
669 input_wakeup_procfs_readers();
670}
671
672void input_register_handler(struct input_handler *handler)
673{
674 struct input_dev *dev;
675 struct input_handle *handle;
676 struct input_device_id *id;
677
678 if (!handler) return;
679
680 INIT_LIST_HEAD(&handler->h_list);
681
682 if (handler->fops != NULL)
683 input_table[handler->minor >> 5] = handler;
684
685 list_add_tail(&handler->node, &input_handler_list);
686
687 list_for_each_entry(dev, &input_dev_list, node)
688 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
689 if ((id = input_match_device(handler->id_table, dev)))
690 if ((handle = handler->connect(handler, dev, id)))
691 input_link_handle(handle);
692
693 input_wakeup_procfs_readers();
694}
695
696void input_unregister_handler(struct input_handler *handler)
697{
698 struct list_head * node, * next;
699
700 list_for_each_safe(node, next, &handler->h_list) {
701 struct input_handle * handle = to_handle_h(node);
702 list_del_init(&handle->h_node);
703 list_del_init(&handle->d_node);
704 handler->disconnect(handle);
705 }
706
707 list_del_init(&handler->node);
708
709 if (handler->fops != NULL)
710 input_table[handler->minor >> 5] = NULL;
711
712 input_wakeup_procfs_readers();
713}
714
715static int input_open_file(struct inode *inode, struct file *file)
716{
717 struct input_handler *handler = input_table[iminor(inode) >> 5];
718 struct file_operations *old_fops, *new_fops = NULL;
719 int err;
720
721 /* No load-on-demand here? */
722 if (!handler || !(new_fops = fops_get(handler->fops)))
723 return -ENODEV;
724
725 /*
726 * That's _really_ odd. Usually NULL ->open means "nothing special",
727 * not "no device". Oh, well...
728 */
729 if (!new_fops->open) {
730 fops_put(new_fops);
731 return -ENODEV;
732 }
733 old_fops = file->f_op;
734 file->f_op = new_fops;
735
736 err = new_fops->open(inode, file);
737
738 if (err) {
739 fops_put(file->f_op);
740 file->f_op = fops_get(old_fops);
741 }
742 fops_put(old_fops);
743 return err;
744}
745
746static struct file_operations input_fops = {
747 .owner = THIS_MODULE,
748 .open = input_open_file,
749};
750
751struct class *input_class;
752
753static int __init input_init(void)
754{
755 int err;
756
757 input_class = class_create(THIS_MODULE, "input");
758 if (IS_ERR(input_class)) {
759 printk(KERN_ERR "input: unable to register input class\n");
760 return PTR_ERR(input_class);
761 }
762
763 err = input_proc_init();
764 if (err)
765 goto fail1;
766
767 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
768 if (err) {
769 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
770 goto fail2;
771 }
772
773 err = devfs_mk_dir("input");
774 if (err)
775 goto fail3;
776
777 return 0;
778
779 fail3: unregister_chrdev(INPUT_MAJOR, "input");
780 fail2: input_proc_exit();
781 fail1: class_destroy(input_class);
782 return err;
783}
784
785static void __exit input_exit(void)
786{
787 input_proc_exit();
788 devfs_remove("input");
789 unregister_chrdev(INPUT_MAJOR, "input");
790 class_destroy(input_class);
791}
792
793subsys_initcall(input_init);
794module_exit(input_exit);