Input: prepare to switching to struct device
[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/smp_lock.h>
15 #include <linux/input.h>
16 #include <linux/module.h>
17 #include <linux/random.h>
18 #include <linux/major.h>
19 #include <linux/proc_fs.h>
20 #include <linux/seq_file.h>
21 #include <linux/interrupt.h>
22 #include <linux/poll.h>
23 #include <linux/device.h>
24 #include <linux/mutex.h>
25
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("Input core");
28 MODULE_LICENSE("GPL");
29
30 #define INPUT_DEVICES   256
31
32 static LIST_HEAD(input_dev_list);
33 static LIST_HEAD(input_handler_list);
34
35 static struct input_handler *input_table[8];
36
37 /**
38  * input_event() - report new input event
39  * @dev: device that generated the event
40  * @type: type of the event
41  * @code: event code
42  * @value: value of the event
43  *
44  * This function should be used by drivers implementing various input devices
45  * See also input_inject_event()
46  */
47 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
48 {
49         struct input_handle *handle;
50
51         if (type > EV_MAX || !test_bit(type, dev->evbit))
52                 return;
53
54         add_input_randomness(type, code, value);
55
56         switch (type) {
57
58                 case EV_SYN:
59                         switch (code) {
60                                 case SYN_CONFIG:
61                                         if (dev->event)
62                                                 dev->event(dev, type, code, value);
63                                         break;
64
65                                 case SYN_REPORT:
66                                         if (dev->sync)
67                                                 return;
68                                         dev->sync = 1;
69                                         break;
70                         }
71                         break;
72
73                 case EV_KEY:
74
75                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
76                                 return;
77
78                         if (value == 2)
79                                 break;
80
81                         change_bit(code, dev->key);
82
83                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
84                                 dev->repeat_key = code;
85                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
86                         }
87
88                         break;
89
90                 case EV_SW:
91
92                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
93                                 return;
94
95                         change_bit(code, dev->sw);
96
97                         break;
98
99                 case EV_ABS:
100
101                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
102                                 return;
103
104                         if (dev->absfuzz[code]) {
105                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
106                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
107                                         return;
108
109                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
110                                     (value < dev->abs[code] + dev->absfuzz[code]))
111                                         value = (dev->abs[code] * 3 + value) >> 2;
112
113                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
114                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
115                                         value = (dev->abs[code] + value) >> 1;
116                         }
117
118                         if (dev->abs[code] == value)
119                                 return;
120
121                         dev->abs[code] = value;
122                         break;
123
124                 case EV_REL:
125
126                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
127                                 return;
128
129                         break;
130
131                 case EV_MSC:
132
133                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
134                                 return;
135
136                         if (dev->event)
137                                 dev->event(dev, type, code, value);
138
139                         break;
140
141                 case EV_LED:
142
143                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
144                                 return;
145
146                         change_bit(code, dev->led);
147
148                         if (dev->event)
149                                 dev->event(dev, type, code, value);
150
151                         break;
152
153                 case EV_SND:
154
155                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
156                                 return;
157
158                         if (!!test_bit(code, dev->snd) != !!value)
159                                 change_bit(code, dev->snd);
160
161                         if (dev->event)
162                                 dev->event(dev, type, code, value);
163
164                         break;
165
166                 case EV_REP:
167
168                         if (code > REP_MAX || value < 0 || dev->rep[code] == value)
169                                 return;
170
171                         dev->rep[code] = value;
172                         if (dev->event)
173                                 dev->event(dev, type, code, value);
174
175                         break;
176
177                 case EV_FF:
178
179                         if (value < 0)
180                                 return;
181
182                         if (dev->event)
183                                 dev->event(dev, type, code, value);
184                         break;
185         }
186
187         if (type != EV_SYN)
188                 dev->sync = 0;
189
190         if (dev->grab)
191                 dev->grab->handler->event(dev->grab, type, code, value);
192         else
193                 list_for_each_entry(handle, &dev->h_list, d_node)
194                         if (handle->open)
195                                 handle->handler->event(handle, type, code, value);
196 }
197 EXPORT_SYMBOL(input_event);
198
199 /**
200  * input_inject_event() - send input event from input handler
201  * @handle: input handle to send event through
202  * @type: type of the event
203  * @code: event code
204  * @value: value of the event
205  *
206  * Similar to input_event() but will ignore event if device is "grabbed" and handle
207  * injecting event is not the one that owns the device.
208  */
209 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
210 {
211         if (!handle->dev->grab || handle->dev->grab == handle)
212                 input_event(handle->dev, type, code, value);
213 }
214 EXPORT_SYMBOL(input_inject_event);
215
216 static void input_repeat_key(unsigned long data)
217 {
218         struct input_dev *dev = (void *) data;
219
220         if (!test_bit(dev->repeat_key, dev->key))
221                 return;
222
223         input_event(dev, EV_KEY, dev->repeat_key, 2);
224         input_sync(dev);
225
226         if (dev->rep[REP_PERIOD])
227                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
228 }
229
230 int input_grab_device(struct input_handle *handle)
231 {
232         if (handle->dev->grab)
233                 return -EBUSY;
234
235         handle->dev->grab = handle;
236         return 0;
237 }
238 EXPORT_SYMBOL(input_grab_device);
239
240 void input_release_device(struct input_handle *handle)
241 {
242         struct input_dev *dev = handle->dev;
243
244         if (dev->grab == handle) {
245                 dev->grab = NULL;
246
247                 list_for_each_entry(handle, &dev->h_list, d_node)
248                         if (handle->handler->start)
249                                 handle->handler->start(handle);
250         }
251 }
252 EXPORT_SYMBOL(input_release_device);
253
254 int input_open_device(struct input_handle *handle)
255 {
256         struct input_dev *dev = handle->dev;
257         int err;
258
259         err = mutex_lock_interruptible(&dev->mutex);
260         if (err)
261                 return err;
262
263         handle->open++;
264
265         if (!dev->users++ && dev->open)
266                 err = dev->open(dev);
267
268         if (err)
269                 handle->open--;
270
271         mutex_unlock(&dev->mutex);
272
273         return err;
274 }
275 EXPORT_SYMBOL(input_open_device);
276
277 int input_flush_device(struct input_handle* handle, struct file* file)
278 {
279         if (handle->dev->flush)
280                 return handle->dev->flush(handle->dev, file);
281
282         return 0;
283 }
284 EXPORT_SYMBOL(input_flush_device);
285
286 void input_close_device(struct input_handle *handle)
287 {
288         struct input_dev *dev = handle->dev;
289
290         input_release_device(handle);
291
292         mutex_lock(&dev->mutex);
293
294         if (!--dev->users && dev->close)
295                 dev->close(dev);
296         handle->open--;
297
298         mutex_unlock(&dev->mutex);
299 }
300 EXPORT_SYMBOL(input_close_device);
301
302 static int input_fetch_keycode(struct input_dev *dev, int scancode)
303 {
304         switch (dev->keycodesize) {
305                 case 1:
306                         return ((u8 *)dev->keycode)[scancode];
307
308                 case 2:
309                         return ((u16 *)dev->keycode)[scancode];
310
311                 default:
312                         return ((u32 *)dev->keycode)[scancode];
313         }
314 }
315
316 static int input_default_getkeycode(struct input_dev *dev,
317                                     int scancode, int *keycode)
318 {
319         if (!dev->keycodesize)
320                 return -EINVAL;
321
322         if (scancode < 0 || scancode >= dev->keycodemax)
323                 return -EINVAL;
324
325         *keycode = input_fetch_keycode(dev, scancode);
326
327         return 0;
328 }
329
330 static int input_default_setkeycode(struct input_dev *dev,
331                                     int scancode, int keycode)
332 {
333         int old_keycode;
334         int i;
335
336         if (scancode < 0 || scancode >= dev->keycodemax)
337                 return -EINVAL;
338
339         if (keycode < 0 || keycode > KEY_MAX)
340                 return -EINVAL;
341
342         if (!dev->keycodesize)
343                 return -EINVAL;
344
345         if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
346                 return -EINVAL;
347
348         switch (dev->keycodesize) {
349                 case 1: {
350                         u8 *k = (u8 *)dev->keycode;
351                         old_keycode = k[scancode];
352                         k[scancode] = keycode;
353                         break;
354                 }
355                 case 2: {
356                         u16 *k = (u16 *)dev->keycode;
357                         old_keycode = k[scancode];
358                         k[scancode] = keycode;
359                         break;
360                 }
361                 default: {
362                         u32 *k = (u32 *)dev->keycode;
363                         old_keycode = k[scancode];
364                         k[scancode] = keycode;
365                         break;
366                 }
367         }
368
369         clear_bit(old_keycode, dev->keybit);
370         set_bit(keycode, dev->keybit);
371
372         for (i = 0; i < dev->keycodemax; i++) {
373                 if (input_fetch_keycode(dev, i) == old_keycode) {
374                         set_bit(old_keycode, dev->keybit);
375                         break; /* Setting the bit twice is useless, so break */
376                 }
377         }
378
379         return 0;
380 }
381
382
383 #define MATCH_BIT(bit, max) \
384                 for (i = 0; i < NBITS(max); i++) \
385                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
386                                 break; \
387                 if (i != NBITS(max)) \
388                         continue;
389
390 static const struct input_device_id *input_match_device(const struct input_device_id *id,
391                                                         struct input_dev *dev)
392 {
393         int i;
394
395         for (; id->flags || id->driver_info; id++) {
396
397                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
398                         if (id->bustype != dev->id.bustype)
399                                 continue;
400
401                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
402                         if (id->vendor != dev->id.vendor)
403                                 continue;
404
405                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
406                         if (id->product != dev->id.product)
407                                 continue;
408
409                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
410                         if (id->version != dev->id.version)
411                                 continue;
412
413                 MATCH_BIT(evbit,  EV_MAX);
414                 MATCH_BIT(keybit, KEY_MAX);
415                 MATCH_BIT(relbit, REL_MAX);
416                 MATCH_BIT(absbit, ABS_MAX);
417                 MATCH_BIT(mscbit, MSC_MAX);
418                 MATCH_BIT(ledbit, LED_MAX);
419                 MATCH_BIT(sndbit, SND_MAX);
420                 MATCH_BIT(ffbit,  FF_MAX);
421                 MATCH_BIT(swbit,  SW_MAX);
422
423                 return id;
424         }
425
426         return NULL;
427 }
428
429 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
430 {
431         const struct input_device_id *id;
432         int error;
433
434         if (handler->blacklist && input_match_device(handler->blacklist, dev))
435                 return -ENODEV;
436
437         id = input_match_device(handler->id_table, dev);
438         if (!id)
439                 return -ENODEV;
440
441         error = handler->connect(handler, dev, id);
442         if (error && error != -ENODEV)
443                 printk(KERN_ERR
444                         "input: failed to attach handler %s to device %s, "
445                         "error: %d\n",
446                         handler->name, kobject_name(&dev->cdev.kobj), error);
447
448         return error;
449 }
450
451
452 #ifdef CONFIG_PROC_FS
453
454 static struct proc_dir_entry *proc_bus_input_dir;
455 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
456 static int input_devices_state;
457
458 static inline void input_wakeup_procfs_readers(void)
459 {
460         input_devices_state++;
461         wake_up(&input_devices_poll_wait);
462 }
463
464 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
465 {
466         int state = input_devices_state;
467
468         poll_wait(file, &input_devices_poll_wait, wait);
469         if (state != input_devices_state)
470                 return POLLIN | POLLRDNORM;
471
472         return 0;
473 }
474
475 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
476 {
477         struct list_head *node;
478         loff_t i = 0;
479
480         list_for_each(node, list)
481                 if (i++ == *pos)
482                         return node;
483
484         return NULL;
485 }
486
487 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
488 {
489         if (element->next == list)
490                 return NULL;
491
492         ++(*pos);
493         return element->next;
494 }
495
496 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
497 {
498         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
499
500         return list_get_nth_element(&input_dev_list, pos);
501 }
502
503 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
504 {
505         return list_get_next_element(&input_dev_list, v, pos);
506 }
507
508 static void input_devices_seq_stop(struct seq_file *seq, void *v)
509 {
510         /* release lock here */
511 }
512
513 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
514                                    unsigned long *bitmap, int max)
515 {
516         int i;
517
518         for (i = NBITS(max) - 1; i > 0; i--)
519                 if (bitmap[i])
520                         break;
521
522         seq_printf(seq, "B: %s=", name);
523         for (; i >= 0; i--)
524                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
525         seq_putc(seq, '\n');
526 }
527
528 static int input_devices_seq_show(struct seq_file *seq, void *v)
529 {
530         struct input_dev *dev = container_of(v, struct input_dev, node);
531         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
532         struct input_handle *handle;
533
534         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
535                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
536
537         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
538         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
539         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
540         seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
541         seq_printf(seq, "H: Handlers=");
542
543         list_for_each_entry(handle, &dev->h_list, d_node)
544                 seq_printf(seq, "%s ", handle->name);
545         seq_putc(seq, '\n');
546
547         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
548         if (test_bit(EV_KEY, dev->evbit))
549                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
550         if (test_bit(EV_REL, dev->evbit))
551                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
552         if (test_bit(EV_ABS, dev->evbit))
553                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
554         if (test_bit(EV_MSC, dev->evbit))
555                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
556         if (test_bit(EV_LED, dev->evbit))
557                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
558         if (test_bit(EV_SND, dev->evbit))
559                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
560         if (test_bit(EV_FF, dev->evbit))
561                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
562         if (test_bit(EV_SW, dev->evbit))
563                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
564
565         seq_putc(seq, '\n');
566
567         kfree(path);
568         return 0;
569 }
570
571 static struct seq_operations input_devices_seq_ops = {
572         .start  = input_devices_seq_start,
573         .next   = input_devices_seq_next,
574         .stop   = input_devices_seq_stop,
575         .show   = input_devices_seq_show,
576 };
577
578 static int input_proc_devices_open(struct inode *inode, struct file *file)
579 {
580         return seq_open(file, &input_devices_seq_ops);
581 }
582
583 static const struct file_operations input_devices_fileops = {
584         .owner          = THIS_MODULE,
585         .open           = input_proc_devices_open,
586         .poll           = input_proc_devices_poll,
587         .read           = seq_read,
588         .llseek         = seq_lseek,
589         .release        = seq_release,
590 };
591
592 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
593 {
594         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
595         seq->private = (void *)(unsigned long)*pos;
596         return list_get_nth_element(&input_handler_list, pos);
597 }
598
599 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
600 {
601         seq->private = (void *)(unsigned long)(*pos + 1);
602         return list_get_next_element(&input_handler_list, v, pos);
603 }
604
605 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
606 {
607         /* release lock here */
608 }
609
610 static int input_handlers_seq_show(struct seq_file *seq, void *v)
611 {
612         struct input_handler *handler = container_of(v, struct input_handler, node);
613
614         seq_printf(seq, "N: Number=%ld Name=%s",
615                    (unsigned long)seq->private, handler->name);
616         if (handler->fops)
617                 seq_printf(seq, " Minor=%d", handler->minor);
618         seq_putc(seq, '\n');
619
620         return 0;
621 }
622 static struct seq_operations input_handlers_seq_ops = {
623         .start  = input_handlers_seq_start,
624         .next   = input_handlers_seq_next,
625         .stop   = input_handlers_seq_stop,
626         .show   = input_handlers_seq_show,
627 };
628
629 static int input_proc_handlers_open(struct inode *inode, struct file *file)
630 {
631         return seq_open(file, &input_handlers_seq_ops);
632 }
633
634 static const struct file_operations input_handlers_fileops = {
635         .owner          = THIS_MODULE,
636         .open           = input_proc_handlers_open,
637         .read           = seq_read,
638         .llseek         = seq_lseek,
639         .release        = seq_release,
640 };
641
642 static int __init input_proc_init(void)
643 {
644         struct proc_dir_entry *entry;
645
646         proc_bus_input_dir = proc_mkdir("input", proc_bus);
647         if (!proc_bus_input_dir)
648                 return -ENOMEM;
649
650         proc_bus_input_dir->owner = THIS_MODULE;
651
652         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
653         if (!entry)
654                 goto fail1;
655
656         entry->owner = THIS_MODULE;
657         entry->proc_fops = &input_devices_fileops;
658
659         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
660         if (!entry)
661                 goto fail2;
662
663         entry->owner = THIS_MODULE;
664         entry->proc_fops = &input_handlers_fileops;
665
666         return 0;
667
668  fail2: remove_proc_entry("devices", proc_bus_input_dir);
669  fail1: remove_proc_entry("input", proc_bus);
670         return -ENOMEM;
671 }
672
673 static void input_proc_exit(void)
674 {
675         remove_proc_entry("devices", proc_bus_input_dir);
676         remove_proc_entry("handlers", proc_bus_input_dir);
677         remove_proc_entry("input", proc_bus);
678 }
679
680 #else /* !CONFIG_PROC_FS */
681 static inline void input_wakeup_procfs_readers(void) { }
682 static inline int input_proc_init(void) { return 0; }
683 static inline void input_proc_exit(void) { }
684 #endif
685
686 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
687 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
688 {                                                                               \
689         struct input_dev *input_dev = to_input_dev(dev);                        \
690                                                                                 \
691         return scnprintf(buf, PAGE_SIZE, "%s\n",                                \
692                          input_dev->name ? input_dev->name : "");               \
693 }                                                                               \
694 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
695
696 INPUT_DEV_STRING_ATTR_SHOW(name);
697 INPUT_DEV_STRING_ATTR_SHOW(phys);
698 INPUT_DEV_STRING_ATTR_SHOW(uniq);
699
700 static int input_print_modalias_bits(char *buf, int size,
701                                      char name, unsigned long *bm,
702                                      unsigned int min_bit, unsigned int max_bit)
703 {
704         int len = 0, i;
705
706         len += snprintf(buf, max(size, 0), "%c", name);
707         for (i = min_bit; i < max_bit; i++)
708                 if (bm[LONG(i)] & BIT(i))
709                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
710         return len;
711 }
712
713 static int input_print_modalias(char *buf, int size, struct input_dev *id,
714                                 int add_cr)
715 {
716         int len;
717
718         len = snprintf(buf, max(size, 0),
719                        "input:b%04Xv%04Xp%04Xe%04X-",
720                        id->id.bustype, id->id.vendor,
721                        id->id.product, id->id.version);
722
723         len += input_print_modalias_bits(buf + len, size - len,
724                                 'e', id->evbit, 0, EV_MAX);
725         len += input_print_modalias_bits(buf + len, size - len,
726                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
727         len += input_print_modalias_bits(buf + len, size - len,
728                                 'r', id->relbit, 0, REL_MAX);
729         len += input_print_modalias_bits(buf + len, size - len,
730                                 'a', id->absbit, 0, ABS_MAX);
731         len += input_print_modalias_bits(buf + len, size - len,
732                                 'm', id->mscbit, 0, MSC_MAX);
733         len += input_print_modalias_bits(buf + len, size - len,
734                                 'l', id->ledbit, 0, LED_MAX);
735         len += input_print_modalias_bits(buf + len, size - len,
736                                 's', id->sndbit, 0, SND_MAX);
737         len += input_print_modalias_bits(buf + len, size - len,
738                                 'f', id->ffbit, 0, FF_MAX);
739         len += input_print_modalias_bits(buf + len, size - len,
740                                 'w', id->swbit, 0, SW_MAX);
741
742         if (add_cr)
743                 len += snprintf(buf + len, max(size - len, 0), "\n");
744
745         return len;
746 }
747
748 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
749 {
750         struct input_dev *id = to_input_dev(dev);
751         ssize_t len;
752
753         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
754
755         return min_t(int, len, PAGE_SIZE);
756 }
757 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
758
759 static struct attribute *input_dev_attrs[] = {
760         &class_device_attr_name.attr,
761         &class_device_attr_phys.attr,
762         &class_device_attr_uniq.attr,
763         &class_device_attr_modalias.attr,
764         NULL
765 };
766
767 static struct attribute_group input_dev_attr_group = {
768         .attrs  = input_dev_attrs,
769 };
770
771 #define INPUT_DEV_ID_ATTR(name)                                                 \
772 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
773 {                                                                               \
774         struct input_dev *input_dev = to_input_dev(dev);                        \
775         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
776 }                                                                               \
777 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
778
779 INPUT_DEV_ID_ATTR(bustype);
780 INPUT_DEV_ID_ATTR(vendor);
781 INPUT_DEV_ID_ATTR(product);
782 INPUT_DEV_ID_ATTR(version);
783
784 static struct attribute *input_dev_id_attrs[] = {
785         &class_device_attr_bustype.attr,
786         &class_device_attr_vendor.attr,
787         &class_device_attr_product.attr,
788         &class_device_attr_version.attr,
789         NULL
790 };
791
792 static struct attribute_group input_dev_id_attr_group = {
793         .name   = "id",
794         .attrs  = input_dev_id_attrs,
795 };
796
797 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
798                               int max, int add_cr)
799 {
800         int i;
801         int len = 0;
802
803         for (i = NBITS(max) - 1; i > 0; i--)
804                 if (bitmap[i])
805                         break;
806
807         for (; i >= 0; i--)
808                 len += snprintf(buf + len, max(buf_size - len, 0),
809                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
810
811         if (add_cr)
812                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
813
814         return len;
815 }
816
817 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
818 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
819 {                                                                               \
820         struct input_dev *input_dev = to_input_dev(dev);                        \
821         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
822                                      input_dev->bm##bit, ev##_MAX, 1);          \
823         return min_t(int, len, PAGE_SIZE);                                      \
824 }                                                                               \
825 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
826
827 INPUT_DEV_CAP_ATTR(EV, ev);
828 INPUT_DEV_CAP_ATTR(KEY, key);
829 INPUT_DEV_CAP_ATTR(REL, rel);
830 INPUT_DEV_CAP_ATTR(ABS, abs);
831 INPUT_DEV_CAP_ATTR(MSC, msc);
832 INPUT_DEV_CAP_ATTR(LED, led);
833 INPUT_DEV_CAP_ATTR(SND, snd);
834 INPUT_DEV_CAP_ATTR(FF, ff);
835 INPUT_DEV_CAP_ATTR(SW, sw);
836
837 static struct attribute *input_dev_caps_attrs[] = {
838         &class_device_attr_ev.attr,
839         &class_device_attr_key.attr,
840         &class_device_attr_rel.attr,
841         &class_device_attr_abs.attr,
842         &class_device_attr_msc.attr,
843         &class_device_attr_led.attr,
844         &class_device_attr_snd.attr,
845         &class_device_attr_ff.attr,
846         &class_device_attr_sw.attr,
847         NULL
848 };
849
850 static struct attribute_group input_dev_caps_attr_group = {
851         .name   = "capabilities",
852         .attrs  = input_dev_caps_attrs,
853 };
854
855 static struct attribute_group *input_dev_attr_groups[] = {
856         &input_dev_attr_group,
857         &input_dev_id_attr_group,
858         &input_dev_caps_attr_group,
859         NULL
860 };
861
862 static void input_dev_release(struct class_device *class_dev)
863 {
864         struct input_dev *dev = to_input_dev(class_dev);
865
866         input_ff_destroy(dev);
867         kfree(dev);
868
869         module_put(THIS_MODULE);
870 }
871
872 /*
873  * Input uevent interface - loading event handlers based on
874  * device bitfields.
875  */
876 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
877                                    char *buffer, int buffer_size, int *cur_len,
878                                    const char *name, unsigned long *bitmap, int max)
879 {
880         if (*cur_index >= num_envp - 1)
881                 return -ENOMEM;
882
883         envp[*cur_index] = buffer + *cur_len;
884
885         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
886         if (*cur_len >= buffer_size)
887                 return -ENOMEM;
888
889         *cur_len += input_print_bitmap(buffer + *cur_len,
890                                         max(buffer_size - *cur_len, 0),
891                                         bitmap, max, 0) + 1;
892         if (*cur_len > buffer_size)
893                 return -ENOMEM;
894
895         (*cur_index)++;
896         return 0;
897 }
898
899 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
900                                          char *buffer, int buffer_size, int *cur_len,
901                                          struct input_dev *dev)
902 {
903         if (*cur_index >= num_envp - 1)
904                 return -ENOMEM;
905
906         envp[*cur_index] = buffer + *cur_len;
907
908         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
909                              "MODALIAS=");
910         if (*cur_len >= buffer_size)
911                 return -ENOMEM;
912
913         *cur_len += input_print_modalias(buffer + *cur_len,
914                                          max(buffer_size - *cur_len, 0),
915                                          dev, 0) + 1;
916         if (*cur_len > buffer_size)
917                 return -ENOMEM;
918
919         (*cur_index)++;
920         return 0;
921 }
922
923 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
924         do {                                                            \
925                 int err = add_uevent_var(envp, num_envp, &i,            \
926                                         buffer, buffer_size, &len,      \
927                                         fmt, val);                      \
928                 if (err)                                                \
929                         return err;                                     \
930         } while (0)
931
932 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
933         do {                                                            \
934                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
935                                         buffer, buffer_size, &len,      \
936                                         name, bm, max);                 \
937                 if (err)                                                \
938                         return err;                                     \
939         } while (0)
940
941 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
942         do {                                                            \
943                 int err = input_add_uevent_modalias_var(envp,           \
944                                         num_envp, &i,                   \
945                                         buffer, buffer_size, &len,      \
946                                         dev);                           \
947                 if (err)                                                \
948                         return err;                                     \
949         } while (0)
950
951 static int input_dev_uevent(struct class_device *cdev, char **envp,
952                             int num_envp, char *buffer, int buffer_size)
953 {
954         struct input_dev *dev = to_input_dev(cdev);
955         int i = 0;
956         int len = 0;
957
958         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
959                                 dev->id.bustype, dev->id.vendor,
960                                 dev->id.product, dev->id.version);
961         if (dev->name)
962                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
963         if (dev->phys)
964                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
965         if (dev->uniq)
966                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
967
968         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
969         if (test_bit(EV_KEY, dev->evbit))
970                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
971         if (test_bit(EV_REL, dev->evbit))
972                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
973         if (test_bit(EV_ABS, dev->evbit))
974                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
975         if (test_bit(EV_MSC, dev->evbit))
976                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
977         if (test_bit(EV_LED, dev->evbit))
978                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
979         if (test_bit(EV_SND, dev->evbit))
980                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
981         if (test_bit(EV_FF, dev->evbit))
982                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
983         if (test_bit(EV_SW, dev->evbit))
984                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
985
986         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
987
988         envp[i] = NULL;
989         return 0;
990 }
991
992 struct class input_class = {
993         .name                   = "input",
994         .release                = input_dev_release,
995         .uevent                 = input_dev_uevent,
996 };
997 EXPORT_SYMBOL_GPL(input_class);
998
999 /**
1000  * input_allocate_device - allocate memory for new input device
1001  *
1002  * Returns prepared struct input_dev or NULL.
1003  *
1004  * NOTE: Use input_free_device() to free devices that have not been
1005  * registered; input_unregister_device() should be used for already
1006  * registered devices.
1007  */
1008 struct input_dev *input_allocate_device(void)
1009 {
1010         struct input_dev *dev;
1011
1012         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1013         if (dev) {
1014                 dev->cdev.class = &input_class;
1015                 dev->cdev.groups = input_dev_attr_groups;
1016                 class_device_initialize(&dev->cdev);
1017                 mutex_init(&dev->mutex);
1018                 INIT_LIST_HEAD(&dev->h_list);
1019                 INIT_LIST_HEAD(&dev->node);
1020
1021                 __module_get(THIS_MODULE);
1022         }
1023
1024         return dev;
1025 }
1026 EXPORT_SYMBOL(input_allocate_device);
1027
1028 /**
1029  * input_free_device - free memory occupied by input_dev structure
1030  * @dev: input device to free
1031  *
1032  * This function should only be used if input_register_device()
1033  * was not called yet or if it failed. Once device was registered
1034  * use input_unregister_device() and memory will be freed once last
1035  * refrence to the device is dropped.
1036  *
1037  * Device should be allocated by input_allocate_device().
1038  *
1039  * NOTE: If there are references to the input device then memory
1040  * will not be freed until last reference is dropped.
1041  */
1042 void input_free_device(struct input_dev *dev)
1043 {
1044         if (dev)
1045                 input_put_device(dev);
1046 }
1047 EXPORT_SYMBOL(input_free_device);
1048
1049 int input_register_device(struct input_dev *dev)
1050 {
1051         static atomic_t input_no = ATOMIC_INIT(0);
1052         struct input_handler *handler;
1053         const char *path;
1054         int error;
1055
1056         set_bit(EV_SYN, dev->evbit);
1057
1058         /*
1059          * If delay and period are pre-set by the driver, then autorepeating
1060          * is handled by the driver itself and we don't do it in input.c.
1061          */
1062
1063         init_timer(&dev->timer);
1064         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1065                 dev->timer.data = (long) dev;
1066                 dev->timer.function = input_repeat_key;
1067                 dev->rep[REP_DELAY] = 250;
1068                 dev->rep[REP_PERIOD] = 33;
1069         }
1070
1071         if (!dev->getkeycode)
1072                 dev->getkeycode = input_default_getkeycode;
1073
1074         if (!dev->setkeycode)
1075                 dev->setkeycode = input_default_setkeycode;
1076
1077         list_add_tail(&dev->node, &input_dev_list);
1078
1079         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
1080                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1081
1082         if (!dev->cdev.dev)
1083                 dev->cdev.dev = dev->dev.parent;
1084
1085         error = class_device_add(&dev->cdev);
1086         if (error)
1087                 return error;
1088
1089         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
1090         printk(KERN_INFO "input: %s as %s\n",
1091                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1092         kfree(path);
1093
1094         list_for_each_entry(handler, &input_handler_list, node)
1095                 input_attach_handler(dev, handler);
1096
1097         input_wakeup_procfs_readers();
1098
1099         return 0;
1100 }
1101 EXPORT_SYMBOL(input_register_device);
1102
1103 void input_unregister_device(struct input_dev *dev)
1104 {
1105         struct input_handle *handle, *next;
1106         int code;
1107
1108         for (code = 0; code <= KEY_MAX; code++)
1109                 if (test_bit(code, dev->key))
1110                         input_report_key(dev, code, 0);
1111         input_sync(dev);
1112
1113         del_timer_sync(&dev->timer);
1114
1115         list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1116                 handle->handler->disconnect(handle);
1117         WARN_ON(!list_empty(&dev->h_list));
1118
1119         list_del_init(&dev->node);
1120
1121         class_device_unregister(&dev->cdev);
1122
1123         input_wakeup_procfs_readers();
1124 }
1125 EXPORT_SYMBOL(input_unregister_device);
1126
1127 int input_register_handler(struct input_handler *handler)
1128 {
1129         struct input_dev *dev;
1130
1131         INIT_LIST_HEAD(&handler->h_list);
1132
1133         if (handler->fops != NULL) {
1134                 if (input_table[handler->minor >> 5])
1135                         return -EBUSY;
1136
1137                 input_table[handler->minor >> 5] = handler;
1138         }
1139
1140         list_add_tail(&handler->node, &input_handler_list);
1141
1142         list_for_each_entry(dev, &input_dev_list, node)
1143                 input_attach_handler(dev, handler);
1144
1145         input_wakeup_procfs_readers();
1146         return 0;
1147 }
1148 EXPORT_SYMBOL(input_register_handler);
1149
1150 void input_unregister_handler(struct input_handler *handler)
1151 {
1152         struct input_handle *handle, *next;
1153
1154         list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1155                 handler->disconnect(handle);
1156         WARN_ON(!list_empty(&handler->h_list));
1157
1158         list_del_init(&handler->node);
1159
1160         if (handler->fops != NULL)
1161                 input_table[handler->minor >> 5] = NULL;
1162
1163         input_wakeup_procfs_readers();
1164 }
1165 EXPORT_SYMBOL(input_unregister_handler);
1166
1167 int input_register_handle(struct input_handle *handle)
1168 {
1169         struct input_handler *handler = handle->handler;
1170
1171         list_add_tail(&handle->d_node, &handle->dev->h_list);
1172         list_add_tail(&handle->h_node, &handler->h_list);
1173
1174         if (handler->start)
1175                 handler->start(handle);
1176
1177         return 0;
1178 }
1179 EXPORT_SYMBOL(input_register_handle);
1180
1181 void input_unregister_handle(struct input_handle *handle)
1182 {
1183         list_del_init(&handle->h_node);
1184         list_del_init(&handle->d_node);
1185 }
1186 EXPORT_SYMBOL(input_unregister_handle);
1187
1188 static int input_open_file(struct inode *inode, struct file *file)
1189 {
1190         struct input_handler *handler = input_table[iminor(inode) >> 5];
1191         const struct file_operations *old_fops, *new_fops = NULL;
1192         int err;
1193
1194         /* No load-on-demand here? */
1195         if (!handler || !(new_fops = fops_get(handler->fops)))
1196                 return -ENODEV;
1197
1198         /*
1199          * That's _really_ odd. Usually NULL ->open means "nothing special",
1200          * not "no device". Oh, well...
1201          */
1202         if (!new_fops->open) {
1203                 fops_put(new_fops);
1204                 return -ENODEV;
1205         }
1206         old_fops = file->f_op;
1207         file->f_op = new_fops;
1208
1209         err = new_fops->open(inode, file);
1210
1211         if (err) {
1212                 fops_put(file->f_op);
1213                 file->f_op = fops_get(old_fops);
1214         }
1215         fops_put(old_fops);
1216         return err;
1217 }
1218
1219 static const struct file_operations input_fops = {
1220         .owner = THIS_MODULE,
1221         .open = input_open_file,
1222 };
1223
1224 static int __init input_init(void)
1225 {
1226         int err;
1227
1228         err = class_register(&input_class);
1229         if (err) {
1230                 printk(KERN_ERR "input: unable to register input_dev class\n");
1231                 return err;
1232         }
1233
1234         err = input_proc_init();
1235         if (err)
1236                 goto fail1;
1237
1238         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1239         if (err) {
1240                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1241                 goto fail2;
1242         }
1243
1244         return 0;
1245
1246  fail2: input_proc_exit();
1247  fail1: class_unregister(&input_class);
1248         return err;
1249 }
1250
1251 static void __exit input_exit(void)
1252 {
1253         input_proc_exit();
1254         unregister_chrdev(INPUT_MAJOR, "input");
1255         class_unregister(&input_class);
1256 }
1257
1258 subsys_initcall(input_init);
1259 module_exit(input_exit);