Pull thermal into release branch
[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/input.h>
15 #include <linux/module.h>
16 #include <linux/random.h>
17 #include <linux/major.h>
18 #include <linux/proc_fs.h>
19 #include <linux/seq_file.h>
20 #include <linux/interrupt.h>
21 #include <linux/poll.h>
22 #include <linux/device.h>
23 #include <linux/mutex.h>
24
25 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
26 MODULE_DESCRIPTION("Input core");
27 MODULE_LICENSE("GPL");
28
29 #define INPUT_DEVICES   256
30
31 static LIST_HEAD(input_dev_list);
32 static LIST_HEAD(input_handler_list);
33
34 static struct input_handler *input_table[8];
35
36 /**
37  * input_event() - report new input event
38  * @dev: device that generated the event
39  * @type: type of the event
40  * @code: event code
41  * @value: value of the event
42  *
43  * This function should be used by drivers implementing various input devices
44  * See also input_inject_event()
45  */
46 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
47 {
48         struct input_handle *handle;
49
50         if (type > EV_MAX || !test_bit(type, dev->evbit))
51                 return;
52
53         add_input_randomness(type, code, value);
54
55         switch (type) {
56
57                 case EV_SYN:
58                         switch (code) {
59                                 case SYN_CONFIG:
60                                         if (dev->event)
61                                                 dev->event(dev, type, code, value);
62                                         break;
63
64                                 case SYN_REPORT:
65                                         if (dev->sync)
66                                                 return;
67                                         dev->sync = 1;
68                                         break;
69                         }
70                         break;
71
72                 case EV_KEY:
73
74                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
75                                 return;
76
77                         if (value == 2)
78                                 break;
79
80                         change_bit(code, dev->key);
81
82                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
83                                 dev->repeat_key = code;
84                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
85                         }
86
87                         break;
88
89                 case EV_SW:
90
91                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
92                                 return;
93
94                         change_bit(code, dev->sw);
95
96                         break;
97
98                 case EV_ABS:
99
100                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
101                                 return;
102
103                         if (dev->absfuzz[code]) {
104                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
105                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
106                                         return;
107
108                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
109                                     (value < dev->abs[code] + dev->absfuzz[code]))
110                                         value = (dev->abs[code] * 3 + value) >> 2;
111
112                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
113                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
114                                         value = (dev->abs[code] + value) >> 1;
115                         }
116
117                         if (dev->abs[code] == value)
118                                 return;
119
120                         dev->abs[code] = value;
121                         break;
122
123                 case EV_REL:
124
125                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
126                                 return;
127
128                         break;
129
130                 case EV_MSC:
131
132                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
133                                 return;
134
135                         if (dev->event)
136                                 dev->event(dev, type, code, value);
137
138                         break;
139
140                 case EV_LED:
141
142                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
143                                 return;
144
145                         change_bit(code, dev->led);
146
147                         if (dev->event)
148                                 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 (!!test_bit(code, dev->snd) != !!value)
158                                 change_bit(code, dev->snd);
159
160                         if (dev->event)
161                                 dev->event(dev, type, code, value);
162
163                         break;
164
165                 case EV_REP:
166
167                         if (code > REP_MAX || value < 0 || dev->rep[code] == value)
168                                 return;
169
170                         dev->rep[code] = value;
171                         if (dev->event)
172                                 dev->event(dev, type, code, value);
173
174                         break;
175
176                 case EV_FF:
177
178                         if (value < 0)
179                                 return;
180
181                         if (dev->event)
182                                 dev->event(dev, type, code, value);
183                         break;
184         }
185
186         if (type != EV_SYN)
187                 dev->sync = 0;
188
189         if (dev->grab)
190                 dev->grab->handler->event(dev->grab, type, code, value);
191         else
192                 list_for_each_entry(handle, &dev->h_list, d_node)
193                         if (handle->open)
194                                 handle->handler->event(handle, type, code, value);
195 }
196 EXPORT_SYMBOL(input_event);
197
198 /**
199  * input_inject_event() - send input event from input handler
200  * @handle: input handle to send event through
201  * @type: type of the event
202  * @code: event code
203  * @value: value of the event
204  *
205  * Similar to input_event() but will ignore event if device is "grabbed" and handle
206  * injecting event is not the one that owns the device.
207  */
208 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
209 {
210         if (!handle->dev->grab || handle->dev->grab == handle)
211                 input_event(handle->dev, type, code, value);
212 }
213 EXPORT_SYMBOL(input_inject_event);
214
215 static void input_repeat_key(unsigned long data)
216 {
217         struct input_dev *dev = (void *) data;
218
219         if (!test_bit(dev->repeat_key, dev->key))
220                 return;
221
222         input_event(dev, EV_KEY, dev->repeat_key, 2);
223         input_sync(dev);
224
225         if (dev->rep[REP_PERIOD])
226                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
227 }
228
229 int input_grab_device(struct input_handle *handle)
230 {
231         if (handle->dev->grab)
232                 return -EBUSY;
233
234         handle->dev->grab = handle;
235         return 0;
236 }
237 EXPORT_SYMBOL(input_grab_device);
238
239 void input_release_device(struct input_handle *handle)
240 {
241         struct input_dev *dev = handle->dev;
242
243         if (dev->grab == handle) {
244                 dev->grab = NULL;
245
246                 list_for_each_entry(handle, &dev->h_list, d_node)
247                         if (handle->handler->start)
248                                 handle->handler->start(handle);
249         }
250 }
251 EXPORT_SYMBOL(input_release_device);
252
253 int input_open_device(struct input_handle *handle)
254 {
255         struct input_dev *dev = handle->dev;
256         int err;
257
258         err = mutex_lock_interruptible(&dev->mutex);
259         if (err)
260                 return err;
261
262         handle->open++;
263
264         if (!dev->users++ && dev->open)
265                 err = dev->open(dev);
266
267         if (err)
268                 handle->open--;
269
270         mutex_unlock(&dev->mutex);
271
272         return err;
273 }
274 EXPORT_SYMBOL(input_open_device);
275
276 int input_flush_device(struct input_handle* handle, struct file* file)
277 {
278         if (handle->dev->flush)
279                 return handle->dev->flush(handle->dev, file);
280
281         return 0;
282 }
283 EXPORT_SYMBOL(input_flush_device);
284
285 void input_close_device(struct input_handle *handle)
286 {
287         struct input_dev *dev = handle->dev;
288
289         input_release_device(handle);
290
291         mutex_lock(&dev->mutex);
292
293         if (!--dev->users && dev->close)
294                 dev->close(dev);
295         handle->open--;
296
297         mutex_unlock(&dev->mutex);
298 }
299 EXPORT_SYMBOL(input_close_device);
300
301 static int input_fetch_keycode(struct input_dev *dev, int scancode)
302 {
303         switch (dev->keycodesize) {
304                 case 1:
305                         return ((u8 *)dev->keycode)[scancode];
306
307                 case 2:
308                         return ((u16 *)dev->keycode)[scancode];
309
310                 default:
311                         return ((u32 *)dev->keycode)[scancode];
312         }
313 }
314
315 static int input_default_getkeycode(struct input_dev *dev,
316                                     int scancode, int *keycode)
317 {
318         if (!dev->keycodesize)
319                 return -EINVAL;
320
321         if (scancode < 0 || scancode >= dev->keycodemax)
322                 return -EINVAL;
323
324         *keycode = input_fetch_keycode(dev, scancode);
325
326         return 0;
327 }
328
329 static int input_default_setkeycode(struct input_dev *dev,
330                                     int scancode, int keycode)
331 {
332         int old_keycode;
333         int i;
334
335         if (scancode < 0 || scancode >= dev->keycodemax)
336                 return -EINVAL;
337
338         if (keycode < 0 || keycode > KEY_MAX)
339                 return -EINVAL;
340
341         if (!dev->keycodesize)
342                 return -EINVAL;
343
344         if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
345                 return -EINVAL;
346
347         switch (dev->keycodesize) {
348                 case 1: {
349                         u8 *k = (u8 *)dev->keycode;
350                         old_keycode = k[scancode];
351                         k[scancode] = keycode;
352                         break;
353                 }
354                 case 2: {
355                         u16 *k = (u16 *)dev->keycode;
356                         old_keycode = k[scancode];
357                         k[scancode] = keycode;
358                         break;
359                 }
360                 default: {
361                         u32 *k = (u32 *)dev->keycode;
362                         old_keycode = k[scancode];
363                         k[scancode] = keycode;
364                         break;
365                 }
366         }
367
368         clear_bit(old_keycode, dev->keybit);
369         set_bit(keycode, dev->keybit);
370
371         for (i = 0; i < dev->keycodemax; i++) {
372                 if (input_fetch_keycode(dev, i) == old_keycode) {
373                         set_bit(old_keycode, dev->keybit);
374                         break; /* Setting the bit twice is useless, so break */
375                 }
376         }
377
378         return 0;
379 }
380
381
382 #define MATCH_BIT(bit, max) \
383                 for (i = 0; i < NBITS(max); i++) \
384                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
385                                 break; \
386                 if (i != NBITS(max)) \
387                         continue;
388
389 static const struct input_device_id *input_match_device(const struct input_device_id *id,
390                                                         struct input_dev *dev)
391 {
392         int i;
393
394         for (; id->flags || id->driver_info; id++) {
395
396                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
397                         if (id->bustype != dev->id.bustype)
398                                 continue;
399
400                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
401                         if (id->vendor != dev->id.vendor)
402                                 continue;
403
404                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
405                         if (id->product != dev->id.product)
406                                 continue;
407
408                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
409                         if (id->version != dev->id.version)
410                                 continue;
411
412                 MATCH_BIT(evbit,  EV_MAX);
413                 MATCH_BIT(keybit, KEY_MAX);
414                 MATCH_BIT(relbit, REL_MAX);
415                 MATCH_BIT(absbit, ABS_MAX);
416                 MATCH_BIT(mscbit, MSC_MAX);
417                 MATCH_BIT(ledbit, LED_MAX);
418                 MATCH_BIT(sndbit, SND_MAX);
419                 MATCH_BIT(ffbit,  FF_MAX);
420                 MATCH_BIT(swbit,  SW_MAX);
421
422                 return id;
423         }
424
425         return NULL;
426 }
427
428 static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
429 {
430         const struct input_device_id *id;
431         int error;
432
433         if (handler->blacklist && input_match_device(handler->blacklist, dev))
434                 return -ENODEV;
435
436         id = input_match_device(handler->id_table, dev);
437         if (!id)
438                 return -ENODEV;
439
440         error = handler->connect(handler, dev, id);
441         if (error && error != -ENODEV)
442                 printk(KERN_ERR
443                         "input: failed to attach handler %s to device %s, "
444                         "error: %d\n",
445                         handler->name, kobject_name(&dev->cdev.kobj), error);
446
447         return error;
448 }
449
450
451 #ifdef CONFIG_PROC_FS
452
453 static struct proc_dir_entry *proc_bus_input_dir;
454 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
455 static int input_devices_state;
456
457 static inline void input_wakeup_procfs_readers(void)
458 {
459         input_devices_state++;
460         wake_up(&input_devices_poll_wait);
461 }
462
463 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
464 {
465         int state = input_devices_state;
466
467         poll_wait(file, &input_devices_poll_wait, wait);
468         if (state != input_devices_state)
469                 return POLLIN | POLLRDNORM;
470
471         return 0;
472 }
473
474 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
475 {
476         struct list_head *node;
477         loff_t i = 0;
478
479         list_for_each(node, list)
480                 if (i++ == *pos)
481                         return node;
482
483         return NULL;
484 }
485
486 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
487 {
488         if (element->next == list)
489                 return NULL;
490
491         ++(*pos);
492         return element->next;
493 }
494
495 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
496 {
497         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
498
499         return list_get_nth_element(&input_dev_list, pos);
500 }
501
502 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
503 {
504         return list_get_next_element(&input_dev_list, v, pos);
505 }
506
507 static void input_devices_seq_stop(struct seq_file *seq, void *v)
508 {
509         /* release lock here */
510 }
511
512 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
513                                    unsigned long *bitmap, int max)
514 {
515         int i;
516
517         for (i = NBITS(max) - 1; i > 0; i--)
518                 if (bitmap[i])
519                         break;
520
521         seq_printf(seq, "B: %s=", name);
522         for (; i >= 0; i--)
523                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
524         seq_putc(seq, '\n');
525 }
526
527 static int input_devices_seq_show(struct seq_file *seq, void *v)
528 {
529         struct input_dev *dev = container_of(v, struct input_dev, node);
530         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
531         struct input_handle *handle;
532
533         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
534                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
535
536         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
537         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
538         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
539         seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
540         seq_printf(seq, "H: Handlers=");
541
542         list_for_each_entry(handle, &dev->h_list, d_node)
543                 seq_printf(seq, "%s ", handle->name);
544         seq_putc(seq, '\n');
545
546         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
547         if (test_bit(EV_KEY, dev->evbit))
548                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
549         if (test_bit(EV_REL, dev->evbit))
550                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
551         if (test_bit(EV_ABS, dev->evbit))
552                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
553         if (test_bit(EV_MSC, dev->evbit))
554                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
555         if (test_bit(EV_LED, dev->evbit))
556                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
557         if (test_bit(EV_SND, dev->evbit))
558                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
559         if (test_bit(EV_FF, dev->evbit))
560                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
561         if (test_bit(EV_SW, dev->evbit))
562                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
563
564         seq_putc(seq, '\n');
565
566         kfree(path);
567         return 0;
568 }
569
570 static struct seq_operations input_devices_seq_ops = {
571         .start  = input_devices_seq_start,
572         .next   = input_devices_seq_next,
573         .stop   = input_devices_seq_stop,
574         .show   = input_devices_seq_show,
575 };
576
577 static int input_proc_devices_open(struct inode *inode, struct file *file)
578 {
579         return seq_open(file, &input_devices_seq_ops);
580 }
581
582 static const struct file_operations input_devices_fileops = {
583         .owner          = THIS_MODULE,
584         .open           = input_proc_devices_open,
585         .poll           = input_proc_devices_poll,
586         .read           = seq_read,
587         .llseek         = seq_lseek,
588         .release        = seq_release,
589 };
590
591 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
592 {
593         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
594         seq->private = (void *)(unsigned long)*pos;
595         return list_get_nth_element(&input_handler_list, pos);
596 }
597
598 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
599 {
600         seq->private = (void *)(unsigned long)(*pos + 1);
601         return list_get_next_element(&input_handler_list, v, pos);
602 }
603
604 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
605 {
606         /* release lock here */
607 }
608
609 static int input_handlers_seq_show(struct seq_file *seq, void *v)
610 {
611         struct input_handler *handler = container_of(v, struct input_handler, node);
612
613         seq_printf(seq, "N: Number=%ld Name=%s",
614                    (unsigned long)seq->private, handler->name);
615         if (handler->fops)
616                 seq_printf(seq, " Minor=%d", handler->minor);
617         seq_putc(seq, '\n');
618
619         return 0;
620 }
621 static struct seq_operations input_handlers_seq_ops = {
622         .start  = input_handlers_seq_start,
623         .next   = input_handlers_seq_next,
624         .stop   = input_handlers_seq_stop,
625         .show   = input_handlers_seq_show,
626 };
627
628 static int input_proc_handlers_open(struct inode *inode, struct file *file)
629 {
630         return seq_open(file, &input_handlers_seq_ops);
631 }
632
633 static const struct file_operations input_handlers_fileops = {
634         .owner          = THIS_MODULE,
635         .open           = input_proc_handlers_open,
636         .read           = seq_read,
637         .llseek         = seq_lseek,
638         .release        = seq_release,
639 };
640
641 static int __init input_proc_init(void)
642 {
643         struct proc_dir_entry *entry;
644
645         proc_bus_input_dir = proc_mkdir("input", proc_bus);
646         if (!proc_bus_input_dir)
647                 return -ENOMEM;
648
649         proc_bus_input_dir->owner = THIS_MODULE;
650
651         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
652         if (!entry)
653                 goto fail1;
654
655         entry->owner = THIS_MODULE;
656         entry->proc_fops = &input_devices_fileops;
657
658         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
659         if (!entry)
660                 goto fail2;
661
662         entry->owner = THIS_MODULE;
663         entry->proc_fops = &input_handlers_fileops;
664
665         return 0;
666
667  fail2: remove_proc_entry("devices", proc_bus_input_dir);
668  fail1: remove_proc_entry("input", proc_bus);
669         return -ENOMEM;
670 }
671
672 static void input_proc_exit(void)
673 {
674         remove_proc_entry("devices", proc_bus_input_dir);
675         remove_proc_entry("handlers", proc_bus_input_dir);
676         remove_proc_entry("input", proc_bus);
677 }
678
679 #else /* !CONFIG_PROC_FS */
680 static inline void input_wakeup_procfs_readers(void) { }
681 static inline int input_proc_init(void) { return 0; }
682 static inline void input_proc_exit(void) { }
683 #endif
684
685 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
686 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
687 {                                                                               \
688         struct input_dev *input_dev = to_input_dev(dev);                        \
689                                                                                 \
690         return scnprintf(buf, PAGE_SIZE, "%s\n",                                \
691                          input_dev->name ? input_dev->name : "");               \
692 }                                                                               \
693 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
694
695 INPUT_DEV_STRING_ATTR_SHOW(name);
696 INPUT_DEV_STRING_ATTR_SHOW(phys);
697 INPUT_DEV_STRING_ATTR_SHOW(uniq);
698
699 static int input_print_modalias_bits(char *buf, int size,
700                                      char name, unsigned long *bm,
701                                      unsigned int min_bit, unsigned int max_bit)
702 {
703         int len = 0, i;
704
705         len += snprintf(buf, max(size, 0), "%c", name);
706         for (i = min_bit; i < max_bit; i++)
707                 if (bm[LONG(i)] & BIT(i))
708                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
709         return len;
710 }
711
712 static int input_print_modalias(char *buf, int size, struct input_dev *id,
713                                 int add_cr)
714 {
715         int len;
716
717         len = snprintf(buf, max(size, 0),
718                        "input:b%04Xv%04Xp%04Xe%04X-",
719                        id->id.bustype, id->id.vendor,
720                        id->id.product, id->id.version);
721
722         len += input_print_modalias_bits(buf + len, size - len,
723                                 'e', id->evbit, 0, EV_MAX);
724         len += input_print_modalias_bits(buf + len, size - len,
725                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
726         len += input_print_modalias_bits(buf + len, size - len,
727                                 'r', id->relbit, 0, REL_MAX);
728         len += input_print_modalias_bits(buf + len, size - len,
729                                 'a', id->absbit, 0, ABS_MAX);
730         len += input_print_modalias_bits(buf + len, size - len,
731                                 'm', id->mscbit, 0, MSC_MAX);
732         len += input_print_modalias_bits(buf + len, size - len,
733                                 'l', id->ledbit, 0, LED_MAX);
734         len += input_print_modalias_bits(buf + len, size - len,
735                                 's', id->sndbit, 0, SND_MAX);
736         len += input_print_modalias_bits(buf + len, size - len,
737                                 'f', id->ffbit, 0, FF_MAX);
738         len += input_print_modalias_bits(buf + len, size - len,
739                                 'w', id->swbit, 0, SW_MAX);
740
741         if (add_cr)
742                 len += snprintf(buf + len, max(size - len, 0), "\n");
743
744         return len;
745 }
746
747 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
748 {
749         struct input_dev *id = to_input_dev(dev);
750         ssize_t len;
751
752         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
753
754         return min_t(int, len, PAGE_SIZE);
755 }
756 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
757
758 static struct attribute *input_dev_attrs[] = {
759         &class_device_attr_name.attr,
760         &class_device_attr_phys.attr,
761         &class_device_attr_uniq.attr,
762         &class_device_attr_modalias.attr,
763         NULL
764 };
765
766 static struct attribute_group input_dev_attr_group = {
767         .attrs  = input_dev_attrs,
768 };
769
770 #define INPUT_DEV_ID_ATTR(name)                                                 \
771 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
772 {                                                                               \
773         struct input_dev *input_dev = to_input_dev(dev);                        \
774         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
775 }                                                                               \
776 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
777
778 INPUT_DEV_ID_ATTR(bustype);
779 INPUT_DEV_ID_ATTR(vendor);
780 INPUT_DEV_ID_ATTR(product);
781 INPUT_DEV_ID_ATTR(version);
782
783 static struct attribute *input_dev_id_attrs[] = {
784         &class_device_attr_bustype.attr,
785         &class_device_attr_vendor.attr,
786         &class_device_attr_product.attr,
787         &class_device_attr_version.attr,
788         NULL
789 };
790
791 static struct attribute_group input_dev_id_attr_group = {
792         .name   = "id",
793         .attrs  = input_dev_id_attrs,
794 };
795
796 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
797                               int max, int add_cr)
798 {
799         int i;
800         int len = 0;
801
802         for (i = NBITS(max) - 1; i > 0; i--)
803                 if (bitmap[i])
804                         break;
805
806         for (; i >= 0; i--)
807                 len += snprintf(buf + len, max(buf_size - len, 0),
808                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
809
810         if (add_cr)
811                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
812
813         return len;
814 }
815
816 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
817 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
818 {                                                                               \
819         struct input_dev *input_dev = to_input_dev(dev);                        \
820         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
821                                      input_dev->bm##bit, ev##_MAX, 1);          \
822         return min_t(int, len, PAGE_SIZE);                                      \
823 }                                                                               \
824 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
825
826 INPUT_DEV_CAP_ATTR(EV, ev);
827 INPUT_DEV_CAP_ATTR(KEY, key);
828 INPUT_DEV_CAP_ATTR(REL, rel);
829 INPUT_DEV_CAP_ATTR(ABS, abs);
830 INPUT_DEV_CAP_ATTR(MSC, msc);
831 INPUT_DEV_CAP_ATTR(LED, led);
832 INPUT_DEV_CAP_ATTR(SND, snd);
833 INPUT_DEV_CAP_ATTR(FF, ff);
834 INPUT_DEV_CAP_ATTR(SW, sw);
835
836 static struct attribute *input_dev_caps_attrs[] = {
837         &class_device_attr_ev.attr,
838         &class_device_attr_key.attr,
839         &class_device_attr_rel.attr,
840         &class_device_attr_abs.attr,
841         &class_device_attr_msc.attr,
842         &class_device_attr_led.attr,
843         &class_device_attr_snd.attr,
844         &class_device_attr_ff.attr,
845         &class_device_attr_sw.attr,
846         NULL
847 };
848
849 static struct attribute_group input_dev_caps_attr_group = {
850         .name   = "capabilities",
851         .attrs  = input_dev_caps_attrs,
852 };
853
854 static struct attribute_group *input_dev_attr_groups[] = {
855         &input_dev_attr_group,
856         &input_dev_id_attr_group,
857         &input_dev_caps_attr_group,
858         NULL
859 };
860
861 static void input_dev_release(struct class_device *class_dev)
862 {
863         struct input_dev *dev = to_input_dev(class_dev);
864
865         input_ff_destroy(dev);
866         kfree(dev);
867
868         module_put(THIS_MODULE);
869 }
870
871 /*
872  * Input uevent interface - loading event handlers based on
873  * device bitfields.
874  */
875 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
876                                    char *buffer, int buffer_size, int *cur_len,
877                                    const char *name, unsigned long *bitmap, int max)
878 {
879         if (*cur_index >= num_envp - 1)
880                 return -ENOMEM;
881
882         envp[*cur_index] = buffer + *cur_len;
883
884         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
885         if (*cur_len >= buffer_size)
886                 return -ENOMEM;
887
888         *cur_len += input_print_bitmap(buffer + *cur_len,
889                                         max(buffer_size - *cur_len, 0),
890                                         bitmap, max, 0) + 1;
891         if (*cur_len > buffer_size)
892                 return -ENOMEM;
893
894         (*cur_index)++;
895         return 0;
896 }
897
898 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
899                                          char *buffer, int buffer_size, int *cur_len,
900                                          struct input_dev *dev)
901 {
902         if (*cur_index >= num_envp - 1)
903                 return -ENOMEM;
904
905         envp[*cur_index] = buffer + *cur_len;
906
907         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
908                              "MODALIAS=");
909         if (*cur_len >= buffer_size)
910                 return -ENOMEM;
911
912         *cur_len += input_print_modalias(buffer + *cur_len,
913                                          max(buffer_size - *cur_len, 0),
914                                          dev, 0) + 1;
915         if (*cur_len > buffer_size)
916                 return -ENOMEM;
917
918         (*cur_index)++;
919         return 0;
920 }
921
922 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
923         do {                                                            \
924                 int err = add_uevent_var(envp, num_envp, &i,            \
925                                         buffer, buffer_size, &len,      \
926                                         fmt, val);                      \
927                 if (err)                                                \
928                         return err;                                     \
929         } while (0)
930
931 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
932         do {                                                            \
933                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
934                                         buffer, buffer_size, &len,      \
935                                         name, bm, max);                 \
936                 if (err)                                                \
937                         return err;                                     \
938         } while (0)
939
940 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
941         do {                                                            \
942                 int err = input_add_uevent_modalias_var(envp,           \
943                                         num_envp, &i,                   \
944                                         buffer, buffer_size, &len,      \
945                                         dev);                           \
946                 if (err)                                                \
947                         return err;                                     \
948         } while (0)
949
950 static int input_dev_uevent(struct class_device *cdev, char **envp,
951                             int num_envp, char *buffer, int buffer_size)
952 {
953         struct input_dev *dev = to_input_dev(cdev);
954         int i = 0;
955         int len = 0;
956
957         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
958                                 dev->id.bustype, dev->id.vendor,
959                                 dev->id.product, dev->id.version);
960         if (dev->name)
961                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
962         if (dev->phys)
963                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
964         if (dev->uniq)
965                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
966
967         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
968         if (test_bit(EV_KEY, dev->evbit))
969                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
970         if (test_bit(EV_REL, dev->evbit))
971                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
972         if (test_bit(EV_ABS, dev->evbit))
973                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
974         if (test_bit(EV_MSC, dev->evbit))
975                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
976         if (test_bit(EV_LED, dev->evbit))
977                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
978         if (test_bit(EV_SND, dev->evbit))
979                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
980         if (test_bit(EV_FF, dev->evbit))
981                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
982         if (test_bit(EV_SW, dev->evbit))
983                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
984
985         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
986
987         envp[i] = NULL;
988         return 0;
989 }
990
991 struct class input_class = {
992         .name                   = "input",
993         .release                = input_dev_release,
994         .uevent                 = input_dev_uevent,
995 };
996 EXPORT_SYMBOL_GPL(input_class);
997
998 /**
999  * input_allocate_device - allocate memory for new input device
1000  *
1001  * Returns prepared struct input_dev or NULL.
1002  *
1003  * NOTE: Use input_free_device() to free devices that have not been
1004  * registered; input_unregister_device() should be used for already
1005  * registered devices.
1006  */
1007 struct input_dev *input_allocate_device(void)
1008 {
1009         struct input_dev *dev;
1010
1011         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1012         if (dev) {
1013                 dev->cdev.class = &input_class;
1014                 dev->cdev.groups = input_dev_attr_groups;
1015                 class_device_initialize(&dev->cdev);
1016                 mutex_init(&dev->mutex);
1017                 INIT_LIST_HEAD(&dev->h_list);
1018                 INIT_LIST_HEAD(&dev->node);
1019
1020                 __module_get(THIS_MODULE);
1021         }
1022
1023         return dev;
1024 }
1025 EXPORT_SYMBOL(input_allocate_device);
1026
1027 /**
1028  * input_free_device - free memory occupied by input_dev structure
1029  * @dev: input device to free
1030  *
1031  * This function should only be used if input_register_device()
1032  * was not called yet or if it failed. Once device was registered
1033  * use input_unregister_device() and memory will be freed once last
1034  * refrence to the device is dropped.
1035  *
1036  * Device should be allocated by input_allocate_device().
1037  *
1038  * NOTE: If there are references to the input device then memory
1039  * will not be freed until last reference is dropped.
1040  */
1041 void input_free_device(struct input_dev *dev)
1042 {
1043         if (dev)
1044                 input_put_device(dev);
1045 }
1046 EXPORT_SYMBOL(input_free_device);
1047
1048 /**
1049  * input_set_capability - mark device as capable of a certain event
1050  * @dev: device that is capable of emitting or accepting event
1051  * @type: type of the event (EV_KEY, EV_REL, etc...)
1052  * @code: event code
1053  *
1054  * In addition to setting up corresponding bit in appropriate capability
1055  * bitmap the function also adjusts dev->evbit.
1056  */
1057 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1058 {
1059         switch (type) {
1060         case EV_KEY:
1061                 __set_bit(code, dev->keybit);
1062                 break;
1063
1064         case EV_REL:
1065                 __set_bit(code, dev->relbit);
1066                 break;
1067
1068         case EV_ABS:
1069                 __set_bit(code, dev->absbit);
1070                 break;
1071
1072         case EV_MSC:
1073                 __set_bit(code, dev->mscbit);
1074                 break;
1075
1076         case EV_SW:
1077                 __set_bit(code, dev->swbit);
1078                 break;
1079
1080         case EV_LED:
1081                 __set_bit(code, dev->ledbit);
1082                 break;
1083
1084         case EV_SND:
1085                 __set_bit(code, dev->sndbit);
1086                 break;
1087
1088         case EV_FF:
1089                 __set_bit(code, dev->ffbit);
1090                 break;
1091
1092         default:
1093                 printk(KERN_ERR
1094                         "input_set_capability: unknown type %u (code %u)\n",
1095                         type, code);
1096                 dump_stack();
1097                 return;
1098         }
1099
1100         __set_bit(type, dev->evbit);
1101 }
1102 EXPORT_SYMBOL(input_set_capability);
1103
1104 int input_register_device(struct input_dev *dev)
1105 {
1106         static atomic_t input_no = ATOMIC_INIT(0);
1107         struct input_handler *handler;
1108         const char *path;
1109         int error;
1110
1111         set_bit(EV_SYN, dev->evbit);
1112
1113         /*
1114          * If delay and period are pre-set by the driver, then autorepeating
1115          * is handled by the driver itself and we don't do it in input.c.
1116          */
1117
1118         init_timer(&dev->timer);
1119         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1120                 dev->timer.data = (long) dev;
1121                 dev->timer.function = input_repeat_key;
1122                 dev->rep[REP_DELAY] = 250;
1123                 dev->rep[REP_PERIOD] = 33;
1124         }
1125
1126         if (!dev->getkeycode)
1127                 dev->getkeycode = input_default_getkeycode;
1128
1129         if (!dev->setkeycode)
1130                 dev->setkeycode = input_default_setkeycode;
1131
1132         list_add_tail(&dev->node, &input_dev_list);
1133
1134         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
1135                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1136
1137         if (!dev->cdev.dev)
1138                 dev->cdev.dev = dev->dev.parent;
1139
1140         error = class_device_add(&dev->cdev);
1141         if (error)
1142                 return error;
1143
1144         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
1145         printk(KERN_INFO "input: %s as %s\n",
1146                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1147         kfree(path);
1148
1149         list_for_each_entry(handler, &input_handler_list, node)
1150                 input_attach_handler(dev, handler);
1151
1152         input_wakeup_procfs_readers();
1153
1154         return 0;
1155 }
1156 EXPORT_SYMBOL(input_register_device);
1157
1158 void input_unregister_device(struct input_dev *dev)
1159 {
1160         struct input_handle *handle, *next;
1161         int code;
1162
1163         for (code = 0; code <= KEY_MAX; code++)
1164                 if (test_bit(code, dev->key))
1165                         input_report_key(dev, code, 0);
1166         input_sync(dev);
1167
1168         del_timer_sync(&dev->timer);
1169
1170         list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1171                 handle->handler->disconnect(handle);
1172         WARN_ON(!list_empty(&dev->h_list));
1173
1174         list_del_init(&dev->node);
1175
1176         class_device_unregister(&dev->cdev);
1177
1178         input_wakeup_procfs_readers();
1179 }
1180 EXPORT_SYMBOL(input_unregister_device);
1181
1182 int input_register_handler(struct input_handler *handler)
1183 {
1184         struct input_dev *dev;
1185
1186         INIT_LIST_HEAD(&handler->h_list);
1187
1188         if (handler->fops != NULL) {
1189                 if (input_table[handler->minor >> 5])
1190                         return -EBUSY;
1191
1192                 input_table[handler->minor >> 5] = handler;
1193         }
1194
1195         list_add_tail(&handler->node, &input_handler_list);
1196
1197         list_for_each_entry(dev, &input_dev_list, node)
1198                 input_attach_handler(dev, handler);
1199
1200         input_wakeup_procfs_readers();
1201         return 0;
1202 }
1203 EXPORT_SYMBOL(input_register_handler);
1204
1205 void input_unregister_handler(struct input_handler *handler)
1206 {
1207         struct input_handle *handle, *next;
1208
1209         list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1210                 handler->disconnect(handle);
1211         WARN_ON(!list_empty(&handler->h_list));
1212
1213         list_del_init(&handler->node);
1214
1215         if (handler->fops != NULL)
1216                 input_table[handler->minor >> 5] = NULL;
1217
1218         input_wakeup_procfs_readers();
1219 }
1220 EXPORT_SYMBOL(input_unregister_handler);
1221
1222 int input_register_handle(struct input_handle *handle)
1223 {
1224         struct input_handler *handler = handle->handler;
1225
1226         list_add_tail(&handle->d_node, &handle->dev->h_list);
1227         list_add_tail(&handle->h_node, &handler->h_list);
1228
1229         if (handler->start)
1230                 handler->start(handle);
1231
1232         return 0;
1233 }
1234 EXPORT_SYMBOL(input_register_handle);
1235
1236 void input_unregister_handle(struct input_handle *handle)
1237 {
1238         list_del_init(&handle->h_node);
1239         list_del_init(&handle->d_node);
1240 }
1241 EXPORT_SYMBOL(input_unregister_handle);
1242
1243 static int input_open_file(struct inode *inode, struct file *file)
1244 {
1245         struct input_handler *handler = input_table[iminor(inode) >> 5];
1246         const struct file_operations *old_fops, *new_fops = NULL;
1247         int err;
1248
1249         /* No load-on-demand here? */
1250         if (!handler || !(new_fops = fops_get(handler->fops)))
1251                 return -ENODEV;
1252
1253         /*
1254          * That's _really_ odd. Usually NULL ->open means "nothing special",
1255          * not "no device". Oh, well...
1256          */
1257         if (!new_fops->open) {
1258                 fops_put(new_fops);
1259                 return -ENODEV;
1260         }
1261         old_fops = file->f_op;
1262         file->f_op = new_fops;
1263
1264         err = new_fops->open(inode, file);
1265
1266         if (err) {
1267                 fops_put(file->f_op);
1268                 file->f_op = fops_get(old_fops);
1269         }
1270         fops_put(old_fops);
1271         return err;
1272 }
1273
1274 static const struct file_operations input_fops = {
1275         .owner = THIS_MODULE,
1276         .open = input_open_file,
1277 };
1278
1279 static int __init input_init(void)
1280 {
1281         int err;
1282
1283         err = class_register(&input_class);
1284         if (err) {
1285                 printk(KERN_ERR "input: unable to register input_dev class\n");
1286                 return err;
1287         }
1288
1289         err = input_proc_init();
1290         if (err)
1291                 goto fail1;
1292
1293         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1294         if (err) {
1295                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1296                 goto fail2;
1297         }
1298
1299         return 0;
1300
1301  fail2: input_proc_exit();
1302  fail1: class_unregister(&input_class);
1303         return err;
1304 }
1305
1306 static void __exit input_exit(void)
1307 {
1308         input_proc_exit();
1309         unregister_chrdev(INPUT_MAJOR, "input");
1310         class_unregister(&input_class);
1311 }
1312
1313 subsys_initcall(input_init);
1314 module_exit(input_exit);