[PATCH] Input: show sysfs path in /proc/bus/input/devices
[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
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("Input core");
28 MODULE_LICENSE("GPL");
29
30 EXPORT_SYMBOL(input_allocate_device);
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_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
186 static 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
200 int 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
208 int 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
217 void input_release_device(struct input_handle *handle)
218 {
219         if (handle->dev->grab == handle)
220                 handle->dev->grab = NULL;
221 }
222
223 int 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
245 int 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
253 void 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
268 static 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
281 static 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
354 static 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
439 static struct proc_dir_entry *proc_bus_input_dir;
440 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
441 static int input_devices_state;
442
443 static inline void input_wakeup_procfs_readers(void)
444 {
445         input_devices_state++;
446         wake_up(&input_devices_poll_wait);
447 }
448
449 static 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
474 static 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         const char *path;
479
480         off_t at = 0;
481         int i, len, cnt = 0;
482
483         list_for_each_entry(dev, &input_dev_list, node) {
484
485                 path = dev->dynalloc ? kobject_get_path(&dev->cdev.kobj, GFP_KERNEL) : NULL;
486
487                 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
488                         dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
489
490                 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
491                 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
492                 len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : "");
493                 len += sprintf(buf + len, "H: Handlers=");
494
495                 list_for_each_entry(handle, &dev->h_list, d_node)
496                         len += sprintf(buf + len, "%s ", handle->name);
497
498                 len += sprintf(buf + len, "\n");
499
500                 SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
501                 SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
502                 SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
503                 SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
504                 SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
505                 SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
506                 SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
507                 SPRINTF_BIT_B2(ffbit,  "FF=",  FF_MAX, EV_FF);
508                 SPRINTF_BIT_B2(swbit,  "SW=",  SW_MAX, EV_SW);
509
510                 len += sprintf(buf + len, "\n");
511
512                 at += len;
513
514                 if (at >= pos) {
515                         if (!*start) {
516                                 *start = buf + (pos - (at - len));
517                                 cnt = at - pos;
518                         } else  cnt += len;
519                         buf += len;
520                         if (cnt >= count)
521                                 break;
522                 }
523
524                 kfree(path);
525         }
526
527         if (&dev->node == &input_dev_list)
528                 *eof = 1;
529
530         return (count > cnt) ? cnt : count;
531 }
532
533 static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
534 {
535         struct input_handler *handler;
536
537         off_t at = 0;
538         int len = 0, cnt = 0;
539         int i = 0;
540
541         list_for_each_entry(handler, &input_handler_list, node) {
542
543                 if (handler->fops)
544                         len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
545                                 i++, handler->name, handler->minor);
546                 else
547                         len = sprintf(buf, "N: Number=%d Name=%s\n",
548                                 i++, handler->name);
549
550                 at += len;
551
552                 if (at >= pos) {
553                         if (!*start) {
554                                 *start = buf + (pos - (at - len));
555                                 cnt = at - pos;
556                         } else  cnt += len;
557                         buf += len;
558                         if (cnt >= count)
559                                 break;
560                 }
561         }
562         if (&handler->node == &input_handler_list)
563                 *eof = 1;
564
565         return (count > cnt) ? cnt : count;
566 }
567
568 static struct file_operations input_fileops;
569
570 static int __init input_proc_init(void)
571 {
572         struct proc_dir_entry *entry;
573
574         proc_bus_input_dir = proc_mkdir("input", proc_bus);
575         if (!proc_bus_input_dir)
576                 return -ENOMEM;
577
578         proc_bus_input_dir->owner = THIS_MODULE;
579
580         entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
581         if (!entry)
582                 goto fail1;
583
584         entry->owner = THIS_MODULE;
585         input_fileops = *entry->proc_fops;
586         entry->proc_fops = &input_fileops;
587         entry->proc_fops->poll = input_devices_poll;
588
589         entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
590         if (!entry)
591                 goto fail2;
592
593         entry->owner = THIS_MODULE;
594
595         return 0;
596
597  fail2: remove_proc_entry("devices", proc_bus_input_dir);
598  fail1: remove_proc_entry("input", proc_bus);
599         return -ENOMEM;
600 }
601
602 static void input_proc_exit(void)
603 {
604         remove_proc_entry("devices", proc_bus_input_dir);
605         remove_proc_entry("handlers", proc_bus_input_dir);
606         remove_proc_entry("input", proc_bus);
607 }
608
609 #else /* !CONFIG_PROC_FS */
610 static inline void input_wakeup_procfs_readers(void) { }
611 static inline int input_proc_init(void) { return 0; }
612 static inline void input_proc_exit(void) { }
613 #endif
614
615 static void input_dev_release(struct class_device *class_dev)
616 {
617         struct input_dev *dev = to_input_dev(class_dev);
618
619         kfree(dev);
620         module_put(THIS_MODULE);
621 }
622
623 static struct class input_dev_class = {
624         .name                   = "input_dev",
625         .release                = input_dev_release,
626 };
627
628 struct input_dev *input_allocate_device(void)
629 {
630         struct input_dev *dev;
631
632         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
633         if (dev) {
634                 dev->dynalloc = 1;
635                 dev->cdev.class = &input_dev_class;
636                 class_device_initialize(&dev->cdev);
637                 INIT_LIST_HEAD(&dev->h_list);
638                 INIT_LIST_HEAD(&dev->node);
639         }
640
641         return dev;
642 }
643
644 static void input_register_classdevice(struct input_dev *dev)
645 {
646         static atomic_t input_no = ATOMIC_INIT(0);
647         const char *path;
648
649         __module_get(THIS_MODULE);
650
651         dev->dev = dev->cdev.dev;
652
653         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
654                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
655
656         path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL);
657         printk(KERN_INFO "input: %s/%s as %s\n",
658                 dev->name ? dev->name : "Unspecified device",
659                 path ? path : "", dev->cdev.class_id);
660         kfree(path);
661
662         class_device_add(&dev->cdev);
663 }
664
665 void input_register_device(struct input_dev *dev)
666 {
667         struct input_handle *handle;
668         struct input_handler *handler;
669         struct input_device_id *id;
670
671         set_bit(EV_SYN, dev->evbit);
672
673         init_MUTEX(&dev->sem);
674
675         /*
676          * If delay and period are pre-set by the driver, then autorepeating
677          * is handled by the driver itself and we don't do it in input.c.
678          */
679
680         init_timer(&dev->timer);
681         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
682                 dev->timer.data = (long) dev;
683                 dev->timer.function = input_repeat_key;
684                 dev->rep[REP_DELAY] = 250;
685                 dev->rep[REP_PERIOD] = 33;
686         }
687
688         INIT_LIST_HEAD(&dev->h_list);
689         list_add_tail(&dev->node, &input_dev_list);
690
691         list_for_each_entry(handler, &input_handler_list, node)
692                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
693                         if ((id = input_match_device(handler->id_table, dev)))
694                                 if ((handle = handler->connect(handler, dev, id)))
695                                         input_link_handle(handle);
696
697
698         if (dev->dynalloc)
699                 input_register_classdevice(dev);
700
701 #ifdef CONFIG_HOTPLUG
702         input_call_hotplug("add", dev);
703 #endif
704
705         input_wakeup_procfs_readers();
706 }
707
708 void input_unregister_device(struct input_dev *dev)
709 {
710         struct list_head * node, * next;
711
712         if (!dev) return;
713
714         del_timer_sync(&dev->timer);
715
716         list_for_each_safe(node, next, &dev->h_list) {
717                 struct input_handle * handle = to_handle(node);
718                 list_del_init(&handle->d_node);
719                 list_del_init(&handle->h_node);
720                 handle->handler->disconnect(handle);
721         }
722
723 #ifdef CONFIG_HOTPLUG
724         input_call_hotplug("remove", dev);
725 #endif
726
727         list_del_init(&dev->node);
728
729         if (dev->dynalloc)
730                 class_device_unregister(&dev->cdev);
731
732         input_wakeup_procfs_readers();
733 }
734
735 void input_register_handler(struct input_handler *handler)
736 {
737         struct input_dev *dev;
738         struct input_handle *handle;
739         struct input_device_id *id;
740
741         if (!handler) return;
742
743         INIT_LIST_HEAD(&handler->h_list);
744
745         if (handler->fops != NULL)
746                 input_table[handler->minor >> 5] = handler;
747
748         list_add_tail(&handler->node, &input_handler_list);
749
750         list_for_each_entry(dev, &input_dev_list, node)
751                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
752                         if ((id = input_match_device(handler->id_table, dev)))
753                                 if ((handle = handler->connect(handler, dev, id)))
754                                         input_link_handle(handle);
755
756         input_wakeup_procfs_readers();
757 }
758
759 void input_unregister_handler(struct input_handler *handler)
760 {
761         struct list_head * node, * next;
762
763         list_for_each_safe(node, next, &handler->h_list) {
764                 struct input_handle * handle = to_handle_h(node);
765                 list_del_init(&handle->h_node);
766                 list_del_init(&handle->d_node);
767                 handler->disconnect(handle);
768         }
769
770         list_del_init(&handler->node);
771
772         if (handler->fops != NULL)
773                 input_table[handler->minor >> 5] = NULL;
774
775         input_wakeup_procfs_readers();
776 }
777
778 static int input_open_file(struct inode *inode, struct file *file)
779 {
780         struct input_handler *handler = input_table[iminor(inode) >> 5];
781         struct file_operations *old_fops, *new_fops = NULL;
782         int err;
783
784         /* No load-on-demand here? */
785         if (!handler || !(new_fops = fops_get(handler->fops)))
786                 return -ENODEV;
787
788         /*
789          * That's _really_ odd. Usually NULL ->open means "nothing special",
790          * not "no device". Oh, well...
791          */
792         if (!new_fops->open) {
793                 fops_put(new_fops);
794                 return -ENODEV;
795         }
796         old_fops = file->f_op;
797         file->f_op = new_fops;
798
799         err = new_fops->open(inode, file);
800
801         if (err) {
802                 fops_put(file->f_op);
803                 file->f_op = fops_get(old_fops);
804         }
805         fops_put(old_fops);
806         return err;
807 }
808
809 static struct file_operations input_fops = {
810         .owner = THIS_MODULE,
811         .open = input_open_file,
812 };
813
814 struct class *input_class;
815
816 static int __init input_init(void)
817 {
818         int err;
819
820         err = class_register(&input_dev_class);
821         if (err) {
822                 printk(KERN_ERR "input: unable to register input_dev class\n");
823                 return err;
824         }
825
826         input_class = class_create(THIS_MODULE, "input");
827         if (IS_ERR(input_class)) {
828                 printk(KERN_ERR "input: unable to register input class\n");
829                 err = PTR_ERR(input_class);
830                 goto fail1;
831         }
832
833         err = input_proc_init();
834         if (err)
835                 goto fail2;
836
837         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
838         if (err) {
839                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
840                 goto fail3;
841         }
842
843         return 0;
844
845  fail3: input_proc_exit();
846  fail2: class_destroy(input_class);
847  fail1: class_unregister(&input_dev_class);
848         return err;
849 }
850
851 static void __exit input_exit(void)
852 {
853         input_proc_exit();
854         unregister_chrdev(INPUT_MAJOR, "input");
855         class_destroy(input_class);
856         class_unregister(&input_dev_class);
857 }
858
859 subsys_initcall(input_init);
860 module_exit(input_exit);