Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild
[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->dev.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->dev.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 device *dev,                \
687                                      struct device_attribute *attr,     \
688                                      char *buf)                         \
689 {                                                                       \
690         struct input_dev *input_dev = to_input_dev(dev);                \
691                                                                         \
692         return scnprintf(buf, PAGE_SIZE, "%s\n",                        \
693                          input_dev->name ? input_dev->name : "");       \
694 }                                                                       \
695 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
696
697 INPUT_DEV_STRING_ATTR_SHOW(name);
698 INPUT_DEV_STRING_ATTR_SHOW(phys);
699 INPUT_DEV_STRING_ATTR_SHOW(uniq);
700
701 static int input_print_modalias_bits(char *buf, int size,
702                                      char name, unsigned long *bm,
703                                      unsigned int min_bit, unsigned int max_bit)
704 {
705         int len = 0, i;
706
707         len += snprintf(buf, max(size, 0), "%c", name);
708         for (i = min_bit; i < max_bit; i++)
709                 if (bm[LONG(i)] & BIT(i))
710                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
711         return len;
712 }
713
714 static int input_print_modalias(char *buf, int size, struct input_dev *id,
715                                 int add_cr)
716 {
717         int len;
718
719         len = snprintf(buf, max(size, 0),
720                        "input:b%04Xv%04Xp%04Xe%04X-",
721                        id->id.bustype, id->id.vendor,
722                        id->id.product, id->id.version);
723
724         len += input_print_modalias_bits(buf + len, size - len,
725                                 'e', id->evbit, 0, EV_MAX);
726         len += input_print_modalias_bits(buf + len, size - len,
727                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
728         len += input_print_modalias_bits(buf + len, size - len,
729                                 'r', id->relbit, 0, REL_MAX);
730         len += input_print_modalias_bits(buf + len, size - len,
731                                 'a', id->absbit, 0, ABS_MAX);
732         len += input_print_modalias_bits(buf + len, size - len,
733                                 'm', id->mscbit, 0, MSC_MAX);
734         len += input_print_modalias_bits(buf + len, size - len,
735                                 'l', id->ledbit, 0, LED_MAX);
736         len += input_print_modalias_bits(buf + len, size - len,
737                                 's', id->sndbit, 0, SND_MAX);
738         len += input_print_modalias_bits(buf + len, size - len,
739                                 'f', id->ffbit, 0, FF_MAX);
740         len += input_print_modalias_bits(buf + len, size - len,
741                                 'w', id->swbit, 0, SW_MAX);
742
743         if (add_cr)
744                 len += snprintf(buf + len, max(size - len, 0), "\n");
745
746         return len;
747 }
748
749 static ssize_t input_dev_show_modalias(struct device *dev,
750                                        struct device_attribute *attr,
751                                        char *buf)
752 {
753         struct input_dev *id = to_input_dev(dev);
754         ssize_t len;
755
756         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
757
758         return min_t(int, len, PAGE_SIZE);
759 }
760 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
761
762 static struct attribute *input_dev_attrs[] = {
763         &dev_attr_name.attr,
764         &dev_attr_phys.attr,
765         &dev_attr_uniq.attr,
766         &dev_attr_modalias.attr,
767         NULL
768 };
769
770 static struct attribute_group input_dev_attr_group = {
771         .attrs  = input_dev_attrs,
772 };
773
774 #define INPUT_DEV_ID_ATTR(name)                                         \
775 static ssize_t input_dev_show_id_##name(struct device *dev,             \
776                                         struct device_attribute *attr,  \
777                                         char *buf)                      \
778 {                                                                       \
779         struct input_dev *input_dev = to_input_dev(dev);                \
780         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
781 }                                                                       \
782 static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
783
784 INPUT_DEV_ID_ATTR(bustype);
785 INPUT_DEV_ID_ATTR(vendor);
786 INPUT_DEV_ID_ATTR(product);
787 INPUT_DEV_ID_ATTR(version);
788
789 static struct attribute *input_dev_id_attrs[] = {
790         &dev_attr_bustype.attr,
791         &dev_attr_vendor.attr,
792         &dev_attr_product.attr,
793         &dev_attr_version.attr,
794         NULL
795 };
796
797 static struct attribute_group input_dev_id_attr_group = {
798         .name   = "id",
799         .attrs  = input_dev_id_attrs,
800 };
801
802 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
803                               int max, int add_cr)
804 {
805         int i;
806         int len = 0;
807
808         for (i = NBITS(max) - 1; i > 0; i--)
809                 if (bitmap[i])
810                         break;
811
812         for (; i >= 0; i--)
813                 len += snprintf(buf + len, max(buf_size - len, 0),
814                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
815
816         if (add_cr)
817                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
818
819         return len;
820 }
821
822 #define INPUT_DEV_CAP_ATTR(ev, bm)                                      \
823 static ssize_t input_dev_show_cap_##bm(struct device *dev,              \
824                                        struct device_attribute *attr,   \
825                                        char *buf)                       \
826 {                                                                       \
827         struct input_dev *input_dev = to_input_dev(dev);                \
828         int len = input_print_bitmap(buf, PAGE_SIZE,                    \
829                                      input_dev->bm##bit, ev##_MAX, 1);  \
830         return min_t(int, len, PAGE_SIZE);                              \
831 }                                                                       \
832 static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
833
834 INPUT_DEV_CAP_ATTR(EV, ev);
835 INPUT_DEV_CAP_ATTR(KEY, key);
836 INPUT_DEV_CAP_ATTR(REL, rel);
837 INPUT_DEV_CAP_ATTR(ABS, abs);
838 INPUT_DEV_CAP_ATTR(MSC, msc);
839 INPUT_DEV_CAP_ATTR(LED, led);
840 INPUT_DEV_CAP_ATTR(SND, snd);
841 INPUT_DEV_CAP_ATTR(FF, ff);
842 INPUT_DEV_CAP_ATTR(SW, sw);
843
844 static struct attribute *input_dev_caps_attrs[] = {
845         &dev_attr_ev.attr,
846         &dev_attr_key.attr,
847         &dev_attr_rel.attr,
848         &dev_attr_abs.attr,
849         &dev_attr_msc.attr,
850         &dev_attr_led.attr,
851         &dev_attr_snd.attr,
852         &dev_attr_ff.attr,
853         &dev_attr_sw.attr,
854         NULL
855 };
856
857 static struct attribute_group input_dev_caps_attr_group = {
858         .name   = "capabilities",
859         .attrs  = input_dev_caps_attrs,
860 };
861
862 static struct attribute_group *input_dev_attr_groups[] = {
863         &input_dev_attr_group,
864         &input_dev_id_attr_group,
865         &input_dev_caps_attr_group,
866         NULL
867 };
868
869 static void input_dev_release(struct device *device)
870 {
871         struct input_dev *dev = to_input_dev(device);
872
873         input_ff_destroy(dev);
874         kfree(dev);
875
876         module_put(THIS_MODULE);
877 }
878
879 /*
880  * Input uevent interface - loading event handlers based on
881  * device bitfields.
882  */
883 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
884                                    char *buffer, int buffer_size, int *cur_len,
885                                    const char *name, unsigned long *bitmap, int max)
886 {
887         if (*cur_index >= num_envp - 1)
888                 return -ENOMEM;
889
890         envp[*cur_index] = buffer + *cur_len;
891
892         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
893         if (*cur_len >= buffer_size)
894                 return -ENOMEM;
895
896         *cur_len += input_print_bitmap(buffer + *cur_len,
897                                         max(buffer_size - *cur_len, 0),
898                                         bitmap, max, 0) + 1;
899         if (*cur_len > buffer_size)
900                 return -ENOMEM;
901
902         (*cur_index)++;
903         return 0;
904 }
905
906 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
907                                          char *buffer, int buffer_size, int *cur_len,
908                                          struct input_dev *dev)
909 {
910         if (*cur_index >= num_envp - 1)
911                 return -ENOMEM;
912
913         envp[*cur_index] = buffer + *cur_len;
914
915         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
916                              "MODALIAS=");
917         if (*cur_len >= buffer_size)
918                 return -ENOMEM;
919
920         *cur_len += input_print_modalias(buffer + *cur_len,
921                                          max(buffer_size - *cur_len, 0),
922                                          dev, 0) + 1;
923         if (*cur_len > buffer_size)
924                 return -ENOMEM;
925
926         (*cur_index)++;
927         return 0;
928 }
929
930 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
931         do {                                                            \
932                 int err = add_uevent_var(envp, num_envp, &i,            \
933                                         buffer, buffer_size, &len,      \
934                                         fmt, val);                      \
935                 if (err)                                                \
936                         return err;                                     \
937         } while (0)
938
939 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
940         do {                                                            \
941                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
942                                         buffer, buffer_size, &len,      \
943                                         name, bm, max);                 \
944                 if (err)                                                \
945                         return err;                                     \
946         } while (0)
947
948 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
949         do {                                                            \
950                 int err = input_add_uevent_modalias_var(envp,           \
951                                         num_envp, &i,                   \
952                                         buffer, buffer_size, &len,      \
953                                         dev);                           \
954                 if (err)                                                \
955                         return err;                                     \
956         } while (0)
957
958 static int input_dev_uevent(struct device *device, char **envp,
959                             int num_envp, char *buffer, int buffer_size)
960 {
961         struct input_dev *dev = to_input_dev(device);
962         int i = 0;
963         int len = 0;
964
965         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
966                                 dev->id.bustype, dev->id.vendor,
967                                 dev->id.product, dev->id.version);
968         if (dev->name)
969                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
970         if (dev->phys)
971                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
972         if (dev->uniq)
973                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
974
975         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
976         if (test_bit(EV_KEY, dev->evbit))
977                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
978         if (test_bit(EV_REL, dev->evbit))
979                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
980         if (test_bit(EV_ABS, dev->evbit))
981                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
982         if (test_bit(EV_MSC, dev->evbit))
983                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
984         if (test_bit(EV_LED, dev->evbit))
985                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
986         if (test_bit(EV_SND, dev->evbit))
987                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
988         if (test_bit(EV_FF, dev->evbit))
989                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
990         if (test_bit(EV_SW, dev->evbit))
991                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
992
993         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
994
995         envp[i] = NULL;
996         return 0;
997 }
998
999 static struct device_type input_dev_type = {
1000         .groups         = input_dev_attr_groups,
1001         .release        = input_dev_release,
1002         .uevent         = input_dev_uevent,
1003 };
1004
1005 struct class input_class = {
1006         .name           = "input",
1007 };
1008 EXPORT_SYMBOL_GPL(input_class);
1009
1010 /**
1011  * input_allocate_device - allocate memory for new input device
1012  *
1013  * Returns prepared struct input_dev or NULL.
1014  *
1015  * NOTE: Use input_free_device() to free devices that have not been
1016  * registered; input_unregister_device() should be used for already
1017  * registered devices.
1018  */
1019 struct input_dev *input_allocate_device(void)
1020 {
1021         struct input_dev *dev;
1022
1023         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1024         if (dev) {
1025                 dev->dev.type = &input_dev_type;
1026                 dev->dev.class = &input_class;
1027                 device_initialize(&dev->dev);
1028                 mutex_init(&dev->mutex);
1029                 INIT_LIST_HEAD(&dev->h_list);
1030                 INIT_LIST_HEAD(&dev->node);
1031
1032                 __module_get(THIS_MODULE);
1033         }
1034
1035         return dev;
1036 }
1037 EXPORT_SYMBOL(input_allocate_device);
1038
1039 /**
1040  * input_free_device - free memory occupied by input_dev structure
1041  * @dev: input device to free
1042  *
1043  * This function should only be used if input_register_device()
1044  * was not called yet or if it failed. Once device was registered
1045  * use input_unregister_device() and memory will be freed once last
1046  * refrence to the device is dropped.
1047  *
1048  * Device should be allocated by input_allocate_device().
1049  *
1050  * NOTE: If there are references to the input device then memory
1051  * will not be freed until last reference is dropped.
1052  */
1053 void input_free_device(struct input_dev *dev)
1054 {
1055         if (dev)
1056                 input_put_device(dev);
1057 }
1058 EXPORT_SYMBOL(input_free_device);
1059
1060 /**
1061  * input_set_capability - mark device as capable of a certain event
1062  * @dev: device that is capable of emitting or accepting event
1063  * @type: type of the event (EV_KEY, EV_REL, etc...)
1064  * @code: event code
1065  *
1066  * In addition to setting up corresponding bit in appropriate capability
1067  * bitmap the function also adjusts dev->evbit.
1068  */
1069 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1070 {
1071         switch (type) {
1072         case EV_KEY:
1073                 __set_bit(code, dev->keybit);
1074                 break;
1075
1076         case EV_REL:
1077                 __set_bit(code, dev->relbit);
1078                 break;
1079
1080         case EV_ABS:
1081                 __set_bit(code, dev->absbit);
1082                 break;
1083
1084         case EV_MSC:
1085                 __set_bit(code, dev->mscbit);
1086                 break;
1087
1088         case EV_SW:
1089                 __set_bit(code, dev->swbit);
1090                 break;
1091
1092         case EV_LED:
1093                 __set_bit(code, dev->ledbit);
1094                 break;
1095
1096         case EV_SND:
1097                 __set_bit(code, dev->sndbit);
1098                 break;
1099
1100         case EV_FF:
1101                 __set_bit(code, dev->ffbit);
1102                 break;
1103
1104         default:
1105                 printk(KERN_ERR
1106                         "input_set_capability: unknown type %u (code %u)\n",
1107                         type, code);
1108                 dump_stack();
1109                 return;
1110         }
1111
1112         __set_bit(type, dev->evbit);
1113 }
1114 EXPORT_SYMBOL(input_set_capability);
1115
1116 int input_register_device(struct input_dev *dev)
1117 {
1118         static atomic_t input_no = ATOMIC_INIT(0);
1119         struct input_handler *handler;
1120         const char *path;
1121         int error;
1122
1123         set_bit(EV_SYN, dev->evbit);
1124
1125         /*
1126          * If delay and period are pre-set by the driver, then autorepeating
1127          * is handled by the driver itself and we don't do it in input.c.
1128          */
1129
1130         init_timer(&dev->timer);
1131         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1132                 dev->timer.data = (long) dev;
1133                 dev->timer.function = input_repeat_key;
1134                 dev->rep[REP_DELAY] = 250;
1135                 dev->rep[REP_PERIOD] = 33;
1136         }
1137
1138         if (!dev->getkeycode)
1139                 dev->getkeycode = input_default_getkeycode;
1140
1141         if (!dev->setkeycode)
1142                 dev->setkeycode = input_default_setkeycode;
1143
1144         list_add_tail(&dev->node, &input_dev_list);
1145
1146         snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
1147                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
1148
1149         if (dev->cdev.dev)
1150                 dev->dev.parent = dev->cdev.dev;
1151
1152         error = device_add(&dev->dev);
1153         if (error)
1154                 return error;
1155
1156         path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
1157         printk(KERN_INFO "input: %s as %s\n",
1158                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1159         kfree(path);
1160
1161         list_for_each_entry(handler, &input_handler_list, node)
1162                 input_attach_handler(dev, handler);
1163
1164         input_wakeup_procfs_readers();
1165
1166         return 0;
1167 }
1168 EXPORT_SYMBOL(input_register_device);
1169
1170 void input_unregister_device(struct input_dev *dev)
1171 {
1172         struct input_handle *handle, *next;
1173         int code;
1174
1175         for (code = 0; code <= KEY_MAX; code++)
1176                 if (test_bit(code, dev->key))
1177                         input_report_key(dev, code, 0);
1178         input_sync(dev);
1179
1180         del_timer_sync(&dev->timer);
1181
1182         list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
1183                 handle->handler->disconnect(handle);
1184         WARN_ON(!list_empty(&dev->h_list));
1185
1186         list_del_init(&dev->node);
1187
1188         device_unregister(&dev->dev);
1189
1190         input_wakeup_procfs_readers();
1191 }
1192 EXPORT_SYMBOL(input_unregister_device);
1193
1194 int input_register_handler(struct input_handler *handler)
1195 {
1196         struct input_dev *dev;
1197
1198         INIT_LIST_HEAD(&handler->h_list);
1199
1200         if (handler->fops != NULL) {
1201                 if (input_table[handler->minor >> 5])
1202                         return -EBUSY;
1203
1204                 input_table[handler->minor >> 5] = handler;
1205         }
1206
1207         list_add_tail(&handler->node, &input_handler_list);
1208
1209         list_for_each_entry(dev, &input_dev_list, node)
1210                 input_attach_handler(dev, handler);
1211
1212         input_wakeup_procfs_readers();
1213         return 0;
1214 }
1215 EXPORT_SYMBOL(input_register_handler);
1216
1217 void input_unregister_handler(struct input_handler *handler)
1218 {
1219         struct input_handle *handle, *next;
1220
1221         list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
1222                 handler->disconnect(handle);
1223         WARN_ON(!list_empty(&handler->h_list));
1224
1225         list_del_init(&handler->node);
1226
1227         if (handler->fops != NULL)
1228                 input_table[handler->minor >> 5] = NULL;
1229
1230         input_wakeup_procfs_readers();
1231 }
1232 EXPORT_SYMBOL(input_unregister_handler);
1233
1234 int input_register_handle(struct input_handle *handle)
1235 {
1236         struct input_handler *handler = handle->handler;
1237
1238         list_add_tail(&handle->d_node, &handle->dev->h_list);
1239         list_add_tail(&handle->h_node, &handler->h_list);
1240
1241         if (handler->start)
1242                 handler->start(handle);
1243
1244         return 0;
1245 }
1246 EXPORT_SYMBOL(input_register_handle);
1247
1248 void input_unregister_handle(struct input_handle *handle)
1249 {
1250         list_del_init(&handle->h_node);
1251         list_del_init(&handle->d_node);
1252 }
1253 EXPORT_SYMBOL(input_unregister_handle);
1254
1255 static int input_open_file(struct inode *inode, struct file *file)
1256 {
1257         struct input_handler *handler = input_table[iminor(inode) >> 5];
1258         const struct file_operations *old_fops, *new_fops = NULL;
1259         int err;
1260
1261         /* No load-on-demand here? */
1262         if (!handler || !(new_fops = fops_get(handler->fops)))
1263                 return -ENODEV;
1264
1265         /*
1266          * That's _really_ odd. Usually NULL ->open means "nothing special",
1267          * not "no device". Oh, well...
1268          */
1269         if (!new_fops->open) {
1270                 fops_put(new_fops);
1271                 return -ENODEV;
1272         }
1273         old_fops = file->f_op;
1274         file->f_op = new_fops;
1275
1276         err = new_fops->open(inode, file);
1277
1278         if (err) {
1279                 fops_put(file->f_op);
1280                 file->f_op = fops_get(old_fops);
1281         }
1282         fops_put(old_fops);
1283         return err;
1284 }
1285
1286 static const struct file_operations input_fops = {
1287         .owner = THIS_MODULE,
1288         .open = input_open_file,
1289 };
1290
1291 static int __init input_init(void)
1292 {
1293         int err;
1294
1295         err = class_register(&input_class);
1296         if (err) {
1297                 printk(KERN_ERR "input: unable to register input_dev class\n");
1298                 return err;
1299         }
1300
1301         err = input_proc_init();
1302         if (err)
1303                 goto fail1;
1304
1305         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1306         if (err) {
1307                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1308                 goto fail2;
1309         }
1310
1311         return 0;
1312
1313  fail2: input_proc_exit();
1314  fail1: class_unregister(&input_class);
1315         return err;
1316 }
1317
1318 static void __exit input_exit(void)
1319 {
1320         input_proc_exit();
1321         unregister_chrdev(INPUT_MAJOR, "input");
1322         class_unregister(&input_class);
1323 }
1324
1325 subsys_initcall(input_init);
1326 module_exit(input_exit);