Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds
[linux-2.6] / 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 void input_link_handle(struct input_handle *handle)
303 {
304         list_add_tail(&handle->d_node, &handle->dev->h_list);
305         list_add_tail(&handle->h_node, &handle->handler->h_list);
306 }
307
308 #define MATCH_BIT(bit, max) \
309                 for (i = 0; i < NBITS(max); i++) \
310                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
311                                 break; \
312                 if (i != NBITS(max)) \
313                         continue;
314
315 static const struct input_device_id *input_match_device(const struct input_device_id *id,
316                                                         struct input_dev *dev)
317 {
318         int i;
319
320         for (; id->flags || id->driver_info; id++) {
321
322                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
323                         if (id->bustype != dev->id.bustype)
324                                 continue;
325
326                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
327                         if (id->vendor != dev->id.vendor)
328                                 continue;
329
330                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
331                         if (id->product != dev->id.product)
332                                 continue;
333
334                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
335                         if (id->version != dev->id.version)
336                                 continue;
337
338                 MATCH_BIT(evbit,  EV_MAX);
339                 MATCH_BIT(keybit, KEY_MAX);
340                 MATCH_BIT(relbit, REL_MAX);
341                 MATCH_BIT(absbit, ABS_MAX);
342                 MATCH_BIT(mscbit, MSC_MAX);
343                 MATCH_BIT(ledbit, LED_MAX);
344                 MATCH_BIT(sndbit, SND_MAX);
345                 MATCH_BIT(ffbit,  FF_MAX);
346                 MATCH_BIT(swbit,  SW_MAX);
347
348                 return id;
349         }
350
351         return NULL;
352 }
353
354 #ifdef CONFIG_PROC_FS
355
356 static struct proc_dir_entry *proc_bus_input_dir;
357 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
358 static int input_devices_state;
359
360 static inline void input_wakeup_procfs_readers(void)
361 {
362         input_devices_state++;
363         wake_up(&input_devices_poll_wait);
364 }
365
366 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
367 {
368         int state = input_devices_state;
369
370         poll_wait(file, &input_devices_poll_wait, wait);
371         if (state != input_devices_state)
372                 return POLLIN | POLLRDNORM;
373
374         return 0;
375 }
376
377 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
378 {
379         struct list_head *node;
380         loff_t i = 0;
381
382         list_for_each(node, list)
383                 if (i++ == *pos)
384                         return node;
385
386         return NULL;
387 }
388
389 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
390 {
391         if (element->next == list)
392                 return NULL;
393
394         ++(*pos);
395         return element->next;
396 }
397
398 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
399 {
400         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
401
402         return list_get_nth_element(&input_dev_list, pos);
403 }
404
405 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
406 {
407         return list_get_next_element(&input_dev_list, v, pos);
408 }
409
410 static void input_devices_seq_stop(struct seq_file *seq, void *v)
411 {
412         /* release lock here */
413 }
414
415 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
416                                    unsigned long *bitmap, int max)
417 {
418         int i;
419
420         for (i = NBITS(max) - 1; i > 0; i--)
421                 if (bitmap[i])
422                         break;
423
424         seq_printf(seq, "B: %s=", name);
425         for (; i >= 0; i--)
426                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
427         seq_putc(seq, '\n');
428 }
429
430 static int input_devices_seq_show(struct seq_file *seq, void *v)
431 {
432         struct input_dev *dev = container_of(v, struct input_dev, node);
433         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
434         struct input_handle *handle;
435
436         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
437                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
438
439         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
440         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
441         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
442         seq_printf(seq, "H: Handlers=");
443
444         list_for_each_entry(handle, &dev->h_list, d_node)
445                 seq_printf(seq, "%s ", handle->name);
446         seq_putc(seq, '\n');
447
448         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
449         if (test_bit(EV_KEY, dev->evbit))
450                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
451         if (test_bit(EV_REL, dev->evbit))
452                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
453         if (test_bit(EV_ABS, dev->evbit))
454                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
455         if (test_bit(EV_MSC, dev->evbit))
456                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
457         if (test_bit(EV_LED, dev->evbit))
458                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
459         if (test_bit(EV_SND, dev->evbit))
460                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
461         if (test_bit(EV_FF, dev->evbit))
462                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
463         if (test_bit(EV_SW, dev->evbit))
464                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
465
466         seq_putc(seq, '\n');
467
468         kfree(path);
469         return 0;
470 }
471
472 static struct seq_operations input_devices_seq_ops = {
473         .start  = input_devices_seq_start,
474         .next   = input_devices_seq_next,
475         .stop   = input_devices_seq_stop,
476         .show   = input_devices_seq_show,
477 };
478
479 static int input_proc_devices_open(struct inode *inode, struct file *file)
480 {
481         return seq_open(file, &input_devices_seq_ops);
482 }
483
484 static const struct file_operations input_devices_fileops = {
485         .owner          = THIS_MODULE,
486         .open           = input_proc_devices_open,
487         .poll           = input_proc_devices_poll,
488         .read           = seq_read,
489         .llseek         = seq_lseek,
490         .release        = seq_release,
491 };
492
493 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
494 {
495         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
496         seq->private = (void *)(unsigned long)*pos;
497         return list_get_nth_element(&input_handler_list, pos);
498 }
499
500 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
501 {
502         seq->private = (void *)(unsigned long)(*pos + 1);
503         return list_get_next_element(&input_handler_list, v, pos);
504 }
505
506 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
507 {
508         /* release lock here */
509 }
510
511 static int input_handlers_seq_show(struct seq_file *seq, void *v)
512 {
513         struct input_handler *handler = container_of(v, struct input_handler, node);
514
515         seq_printf(seq, "N: Number=%ld Name=%s",
516                    (unsigned long)seq->private, handler->name);
517         if (handler->fops)
518                 seq_printf(seq, " Minor=%d", handler->minor);
519         seq_putc(seq, '\n');
520
521         return 0;
522 }
523 static struct seq_operations input_handlers_seq_ops = {
524         .start  = input_handlers_seq_start,
525         .next   = input_handlers_seq_next,
526         .stop   = input_handlers_seq_stop,
527         .show   = input_handlers_seq_show,
528 };
529
530 static int input_proc_handlers_open(struct inode *inode, struct file *file)
531 {
532         return seq_open(file, &input_handlers_seq_ops);
533 }
534
535 static const struct file_operations input_handlers_fileops = {
536         .owner          = THIS_MODULE,
537         .open           = input_proc_handlers_open,
538         .read           = seq_read,
539         .llseek         = seq_lseek,
540         .release        = seq_release,
541 };
542
543 static int __init input_proc_init(void)
544 {
545         struct proc_dir_entry *entry;
546
547         proc_bus_input_dir = proc_mkdir("input", proc_bus);
548         if (!proc_bus_input_dir)
549                 return -ENOMEM;
550
551         proc_bus_input_dir->owner = THIS_MODULE;
552
553         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
554         if (!entry)
555                 goto fail1;
556
557         entry->owner = THIS_MODULE;
558         entry->proc_fops = &input_devices_fileops;
559
560         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
561         if (!entry)
562                 goto fail2;
563
564         entry->owner = THIS_MODULE;
565         entry->proc_fops = &input_handlers_fileops;
566
567         return 0;
568
569  fail2: remove_proc_entry("devices", proc_bus_input_dir);
570  fail1: remove_proc_entry("input", proc_bus);
571         return -ENOMEM;
572 }
573
574 static void input_proc_exit(void)
575 {
576         remove_proc_entry("devices", proc_bus_input_dir);
577         remove_proc_entry("handlers", proc_bus_input_dir);
578         remove_proc_entry("input", proc_bus);
579 }
580
581 #else /* !CONFIG_PROC_FS */
582 static inline void input_wakeup_procfs_readers(void) { }
583 static inline int input_proc_init(void) { return 0; }
584 static inline void input_proc_exit(void) { }
585 #endif
586
587 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
588 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
589 {                                                                               \
590         struct input_dev *input_dev = to_input_dev(dev);                        \
591                                                                                 \
592         return scnprintf(buf, PAGE_SIZE, "%s\n",                                \
593                          input_dev->name ? input_dev->name : "");               \
594 }                                                                               \
595 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
596
597 INPUT_DEV_STRING_ATTR_SHOW(name);
598 INPUT_DEV_STRING_ATTR_SHOW(phys);
599 INPUT_DEV_STRING_ATTR_SHOW(uniq);
600
601 static int input_print_modalias_bits(char *buf, int size,
602                                      char name, unsigned long *bm,
603                                      unsigned int min_bit, unsigned int max_bit)
604 {
605         int len = 0, i;
606
607         len += snprintf(buf, max(size, 0), "%c", name);
608         for (i = min_bit; i < max_bit; i++)
609                 if (bm[LONG(i)] & BIT(i))
610                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
611         return len;
612 }
613
614 static int input_print_modalias(char *buf, int size, struct input_dev *id,
615                                 int add_cr)
616 {
617         int len;
618
619         len = snprintf(buf, max(size, 0),
620                        "input:b%04Xv%04Xp%04Xe%04X-",
621                        id->id.bustype, id->id.vendor,
622                        id->id.product, id->id.version);
623
624         len += input_print_modalias_bits(buf + len, size - len,
625                                 'e', id->evbit, 0, EV_MAX);
626         len += input_print_modalias_bits(buf + len, size - len,
627                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
628         len += input_print_modalias_bits(buf + len, size - len,
629                                 'r', id->relbit, 0, REL_MAX);
630         len += input_print_modalias_bits(buf + len, size - len,
631                                 'a', id->absbit, 0, ABS_MAX);
632         len += input_print_modalias_bits(buf + len, size - len,
633                                 'm', id->mscbit, 0, MSC_MAX);
634         len += input_print_modalias_bits(buf + len, size - len,
635                                 'l', id->ledbit, 0, LED_MAX);
636         len += input_print_modalias_bits(buf + len, size - len,
637                                 's', id->sndbit, 0, SND_MAX);
638         len += input_print_modalias_bits(buf + len, size - len,
639                                 'f', id->ffbit, 0, FF_MAX);
640         len += input_print_modalias_bits(buf + len, size - len,
641                                 'w', id->swbit, 0, SW_MAX);
642
643         if (add_cr)
644                 len += snprintf(buf + len, max(size - len, 0), "\n");
645
646         return len;
647 }
648
649 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
650 {
651         struct input_dev *id = to_input_dev(dev);
652         ssize_t len;
653
654         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
655
656         return min_t(int, len, PAGE_SIZE);
657 }
658 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
659
660 static struct attribute *input_dev_attrs[] = {
661         &class_device_attr_name.attr,
662         &class_device_attr_phys.attr,
663         &class_device_attr_uniq.attr,
664         &class_device_attr_modalias.attr,
665         NULL
666 };
667
668 static struct attribute_group input_dev_attr_group = {
669         .attrs  = input_dev_attrs,
670 };
671
672 #define INPUT_DEV_ID_ATTR(name)                                                 \
673 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
674 {                                                                               \
675         struct input_dev *input_dev = to_input_dev(dev);                        \
676         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
677 }                                                                               \
678 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
679
680 INPUT_DEV_ID_ATTR(bustype);
681 INPUT_DEV_ID_ATTR(vendor);
682 INPUT_DEV_ID_ATTR(product);
683 INPUT_DEV_ID_ATTR(version);
684
685 static struct attribute *input_dev_id_attrs[] = {
686         &class_device_attr_bustype.attr,
687         &class_device_attr_vendor.attr,
688         &class_device_attr_product.attr,
689         &class_device_attr_version.attr,
690         NULL
691 };
692
693 static struct attribute_group input_dev_id_attr_group = {
694         .name   = "id",
695         .attrs  = input_dev_id_attrs,
696 };
697
698 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
699                               int max, int add_cr)
700 {
701         int i;
702         int len = 0;
703
704         for (i = NBITS(max) - 1; i > 0; i--)
705                 if (bitmap[i])
706                         break;
707
708         for (; i >= 0; i--)
709                 len += snprintf(buf + len, max(buf_size - len, 0),
710                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
711
712         if (add_cr)
713                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
714
715         return len;
716 }
717
718 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
719 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
720 {                                                                               \
721         struct input_dev *input_dev = to_input_dev(dev);                        \
722         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
723                                      input_dev->bm##bit, ev##_MAX, 1);          \
724         return min_t(int, len, PAGE_SIZE);                                      \
725 }                                                                               \
726 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
727
728 INPUT_DEV_CAP_ATTR(EV, ev);
729 INPUT_DEV_CAP_ATTR(KEY, key);
730 INPUT_DEV_CAP_ATTR(REL, rel);
731 INPUT_DEV_CAP_ATTR(ABS, abs);
732 INPUT_DEV_CAP_ATTR(MSC, msc);
733 INPUT_DEV_CAP_ATTR(LED, led);
734 INPUT_DEV_CAP_ATTR(SND, snd);
735 INPUT_DEV_CAP_ATTR(FF, ff);
736 INPUT_DEV_CAP_ATTR(SW, sw);
737
738 static struct attribute *input_dev_caps_attrs[] = {
739         &class_device_attr_ev.attr,
740         &class_device_attr_key.attr,
741         &class_device_attr_rel.attr,
742         &class_device_attr_abs.attr,
743         &class_device_attr_msc.attr,
744         &class_device_attr_led.attr,
745         &class_device_attr_snd.attr,
746         &class_device_attr_ff.attr,
747         &class_device_attr_sw.attr,
748         NULL
749 };
750
751 static struct attribute_group input_dev_caps_attr_group = {
752         .name   = "capabilities",
753         .attrs  = input_dev_caps_attrs,
754 };
755
756 static void input_dev_release(struct class_device *class_dev)
757 {
758         struct input_dev *dev = to_input_dev(class_dev);
759
760         input_ff_destroy(dev);
761         kfree(dev);
762
763         module_put(THIS_MODULE);
764 }
765
766 /*
767  * Input uevent interface - loading event handlers based on
768  * device bitfields.
769  */
770 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
771                                    char *buffer, int buffer_size, int *cur_len,
772                                    const char *name, unsigned long *bitmap, int max)
773 {
774         if (*cur_index >= num_envp - 1)
775                 return -ENOMEM;
776
777         envp[*cur_index] = buffer + *cur_len;
778
779         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
780         if (*cur_len >= buffer_size)
781                 return -ENOMEM;
782
783         *cur_len += input_print_bitmap(buffer + *cur_len,
784                                         max(buffer_size - *cur_len, 0),
785                                         bitmap, max, 0) + 1;
786         if (*cur_len > buffer_size)
787                 return -ENOMEM;
788
789         (*cur_index)++;
790         return 0;
791 }
792
793 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
794                                          char *buffer, int buffer_size, int *cur_len,
795                                          struct input_dev *dev)
796 {
797         if (*cur_index >= num_envp - 1)
798                 return -ENOMEM;
799
800         envp[*cur_index] = buffer + *cur_len;
801
802         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
803                              "MODALIAS=");
804         if (*cur_len >= buffer_size)
805                 return -ENOMEM;
806
807         *cur_len += input_print_modalias(buffer + *cur_len,
808                                          max(buffer_size - *cur_len, 0),
809                                          dev, 0) + 1;
810         if (*cur_len > buffer_size)
811                 return -ENOMEM;
812
813         (*cur_index)++;
814         return 0;
815 }
816
817 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
818         do {                                                            \
819                 int err = add_uevent_var(envp, num_envp, &i,            \
820                                         buffer, buffer_size, &len,      \
821                                         fmt, val);                      \
822                 if (err)                                                \
823                         return err;                                     \
824         } while (0)
825
826 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
827         do {                                                            \
828                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
829                                         buffer, buffer_size, &len,      \
830                                         name, bm, max);                 \
831                 if (err)                                                \
832                         return err;                                     \
833         } while (0)
834
835 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
836         do {                                                            \
837                 int err = input_add_uevent_modalias_var(envp,           \
838                                         num_envp, &i,                   \
839                                         buffer, buffer_size, &len,      \
840                                         dev);                           \
841                 if (err)                                                \
842                         return err;                                     \
843         } while (0)
844
845 static int input_dev_uevent(struct class_device *cdev, char **envp,
846                             int num_envp, char *buffer, int buffer_size)
847 {
848         struct input_dev *dev = to_input_dev(cdev);
849         int i = 0;
850         int len = 0;
851
852         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
853                                 dev->id.bustype, dev->id.vendor,
854                                 dev->id.product, dev->id.version);
855         if (dev->name)
856                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
857         if (dev->phys)
858                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
859         if (dev->uniq)
860                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
861
862         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
863         if (test_bit(EV_KEY, dev->evbit))
864                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
865         if (test_bit(EV_REL, dev->evbit))
866                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
867         if (test_bit(EV_ABS, dev->evbit))
868                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
869         if (test_bit(EV_MSC, dev->evbit))
870                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
871         if (test_bit(EV_LED, dev->evbit))
872                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
873         if (test_bit(EV_SND, dev->evbit))
874                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
875         if (test_bit(EV_FF, dev->evbit))
876                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
877         if (test_bit(EV_SW, dev->evbit))
878                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
879
880         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
881
882         envp[i] = NULL;
883         return 0;
884 }
885
886 struct class input_class = {
887         .name                   = "input",
888         .release                = input_dev_release,
889         .uevent                 = input_dev_uevent,
890 };
891 EXPORT_SYMBOL_GPL(input_class);
892
893 /**
894  * input_allocate_device - allocate memory for new input device
895  *
896  * Returns prepared struct input_dev or NULL.
897  *
898  * NOTE: Use input_free_device() to free devices that have not been
899  * registered; input_unregister_device() should be used for already
900  * registered devices.
901  */
902 struct input_dev *input_allocate_device(void)
903 {
904         struct input_dev *dev;
905
906         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
907         if (dev) {
908                 dev->cdev.class = &input_class;
909                 class_device_initialize(&dev->cdev);
910                 mutex_init(&dev->mutex);
911                 INIT_LIST_HEAD(&dev->h_list);
912                 INIT_LIST_HEAD(&dev->node);
913
914                 __module_get(THIS_MODULE);
915         }
916
917         return dev;
918 }
919 EXPORT_SYMBOL(input_allocate_device);
920
921 /**
922  * input_free_device - free memory occupied by input_dev structure
923  * @dev: input device to free
924  *
925  * This function should only be used if input_register_device()
926  * was not called yet or if it failed. Once device was registered
927  * use input_unregister_device() and memory will be freed once last
928  * refrence to the device is dropped.
929  *
930  * Device should be allocated by input_allocate_device().
931  *
932  * NOTE: If there are references to the input device then memory
933  * will not be freed until last reference is dropped.
934  */
935 void input_free_device(struct input_dev *dev)
936 {
937         if (dev) {
938
939                 mutex_lock(&dev->mutex);
940                 dev->name = dev->phys = dev->uniq = NULL;
941                 mutex_unlock(&dev->mutex);
942
943                 input_put_device(dev);
944         }
945 }
946 EXPORT_SYMBOL(input_free_device);
947
948 int input_register_device(struct input_dev *dev)
949 {
950         static atomic_t input_no = ATOMIC_INIT(0);
951         struct input_handle *handle;
952         struct input_handler *handler;
953         const struct input_device_id *id;
954         const char *path;
955         int error;
956
957         set_bit(EV_SYN, dev->evbit);
958
959         /*
960          * If delay and period are pre-set by the driver, then autorepeating
961          * is handled by the driver itself and we don't do it in input.c.
962          */
963
964         init_timer(&dev->timer);
965         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
966                 dev->timer.data = (long) dev;
967                 dev->timer.function = input_repeat_key;
968                 dev->rep[REP_DELAY] = 250;
969                 dev->rep[REP_PERIOD] = 33;
970         }
971
972         list_add_tail(&dev->node, &input_dev_list);
973
974         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
975                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
976
977         error = class_device_add(&dev->cdev);
978         if (error)
979                 return error;
980
981         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
982         if (error)
983                 goto fail1;
984
985         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
986         if (error)
987                 goto fail2;
988
989         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
990         if (error)
991                 goto fail3;
992
993         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
994         printk(KERN_INFO "input: %s as %s\n",
995                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
996         kfree(path);
997
998         list_for_each_entry(handler, &input_handler_list, node)
999                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1000                         if ((id = input_match_device(handler->id_table, dev)))
1001                                 if ((handle = handler->connect(handler, dev, id))) {
1002                                         input_link_handle(handle);
1003                                         if (handler->start)
1004                                                 handler->start(handle);
1005                                 }
1006
1007         input_wakeup_procfs_readers();
1008
1009         return 0;
1010
1011  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1012  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1013  fail1: class_device_del(&dev->cdev);
1014         return error;
1015 }
1016 EXPORT_SYMBOL(input_register_device);
1017
1018 void input_unregister_device(struct input_dev *dev)
1019 {
1020         struct list_head *node, *next;
1021         int code;
1022
1023         for (code = 0; code <= KEY_MAX; code++)
1024                 if (test_bit(code, dev->key))
1025                         input_report_key(dev, code, 0);
1026         input_sync(dev);
1027
1028         del_timer_sync(&dev->timer);
1029
1030         list_for_each_safe(node, next, &dev->h_list) {
1031                 struct input_handle * handle = to_handle(node);
1032                 list_del_init(&handle->d_node);
1033                 list_del_init(&handle->h_node);
1034                 handle->handler->disconnect(handle);
1035         }
1036
1037         list_del_init(&dev->node);
1038
1039         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1040         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1041         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1042
1043         class_device_unregister(&dev->cdev);
1044
1045         input_wakeup_procfs_readers();
1046 }
1047 EXPORT_SYMBOL(input_unregister_device);
1048
1049 int input_register_handler(struct input_handler *handler)
1050 {
1051         struct input_dev *dev;
1052         struct input_handle *handle;
1053         const struct input_device_id *id;
1054
1055         INIT_LIST_HEAD(&handler->h_list);
1056
1057         if (handler->fops != NULL) {
1058                 if (input_table[handler->minor >> 5])
1059                         return -EBUSY;
1060
1061                 input_table[handler->minor >> 5] = handler;
1062         }
1063
1064         list_add_tail(&handler->node, &input_handler_list);
1065
1066         list_for_each_entry(dev, &input_dev_list, node)
1067                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1068                         if ((id = input_match_device(handler->id_table, dev)))
1069                                 if ((handle = handler->connect(handler, dev, id))) {
1070                                         input_link_handle(handle);
1071                                         if (handler->start)
1072                                                 handler->start(handle);
1073                                 }
1074
1075         input_wakeup_procfs_readers();
1076         return 0;
1077 }
1078 EXPORT_SYMBOL(input_register_handler);
1079
1080 void input_unregister_handler(struct input_handler *handler)
1081 {
1082         struct list_head *node, *next;
1083
1084         list_for_each_safe(node, next, &handler->h_list) {
1085                 struct input_handle * handle = to_handle_h(node);
1086                 list_del_init(&handle->h_node);
1087                 list_del_init(&handle->d_node);
1088                 handler->disconnect(handle);
1089         }
1090
1091         list_del_init(&handler->node);
1092
1093         if (handler->fops != NULL)
1094                 input_table[handler->minor >> 5] = NULL;
1095
1096         input_wakeup_procfs_readers();
1097 }
1098 EXPORT_SYMBOL(input_unregister_handler);
1099
1100 static int input_open_file(struct inode *inode, struct file *file)
1101 {
1102         struct input_handler *handler = input_table[iminor(inode) >> 5];
1103         const struct file_operations *old_fops, *new_fops = NULL;
1104         int err;
1105
1106         /* No load-on-demand here? */
1107         if (!handler || !(new_fops = fops_get(handler->fops)))
1108                 return -ENODEV;
1109
1110         /*
1111          * That's _really_ odd. Usually NULL ->open means "nothing special",
1112          * not "no device". Oh, well...
1113          */
1114         if (!new_fops->open) {
1115                 fops_put(new_fops);
1116                 return -ENODEV;
1117         }
1118         old_fops = file->f_op;
1119         file->f_op = new_fops;
1120
1121         err = new_fops->open(inode, file);
1122
1123         if (err) {
1124                 fops_put(file->f_op);
1125                 file->f_op = fops_get(old_fops);
1126         }
1127         fops_put(old_fops);
1128         return err;
1129 }
1130
1131 static const struct file_operations input_fops = {
1132         .owner = THIS_MODULE,
1133         .open = input_open_file,
1134 };
1135
1136 static int __init input_init(void)
1137 {
1138         int err;
1139
1140         err = class_register(&input_class);
1141         if (err) {
1142                 printk(KERN_ERR "input: unable to register input_dev class\n");
1143                 return err;
1144         }
1145
1146         err = input_proc_init();
1147         if (err)
1148                 goto fail1;
1149
1150         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1151         if (err) {
1152                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1153                 goto fail2;
1154         }
1155
1156         return 0;
1157
1158  fail2: input_proc_exit();
1159  fail1: class_unregister(&input_class);
1160         return err;
1161 }
1162
1163 static void __exit input_exit(void)
1164 {
1165         input_proc_exit();
1166         unregister_chrdev(INPUT_MAJOR, "input");
1167         class_unregister(&input_class);
1168 }
1169
1170 subsys_initcall(input_init);
1171 module_exit(input_exit);