Input: send key up events at disconnect
[linux-2.6.git] / drivers / input / input.c
1 /*
2  * The input core
3  *
4  * Copyright (c) 1999-2002 Vojtech Pavlik
5  */
6
7 /*
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License version 2 as published by
10  * the Free Software Foundation.
11  */
12
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/smp_lock.h>
16 #include <linux/input.h>
17 #include <linux/module.h>
18 #include <linux/random.h>
19 #include <linux/major.h>
20 #include <linux/proc_fs.h>
21 #include <linux/seq_file.h>
22 #include <linux/interrupt.h>
23 #include <linux/poll.h>
24 #include <linux/device.h>
25 #include <linux/mutex.h>
26
27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
28 MODULE_DESCRIPTION("Input core");
29 MODULE_LICENSE("GPL");
30
31 #define INPUT_DEVICES   256
32
33 static LIST_HEAD(input_dev_list);
34 static LIST_HEAD(input_handler_list);
35
36 static struct input_handler *input_table[8];
37
38 /**
39  * input_event() - report new input event
40  * @handle: device that generated the event
41  * @type: type of the event
42  * @code: event code
43  * @value: value of the event
44  *
45  * This function should be used by drivers implementing various input devices
46  * See also input_inject_event()
47  */
48 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
49 {
50         struct input_handle *handle;
51
52         if (type > EV_MAX || !test_bit(type, dev->evbit))
53                 return;
54
55         add_input_randomness(type, code, value);
56
57         switch (type) {
58
59                 case EV_SYN:
60                         switch (code) {
61                                 case SYN_CONFIG:
62                                         if (dev->event)
63                                                 dev->event(dev, type, code, value);
64                                         break;
65
66                                 case SYN_REPORT:
67                                         if (dev->sync)
68                                                 return;
69                                         dev->sync = 1;
70                                         break;
71                         }
72                         break;
73
74                 case EV_KEY:
75
76                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
77                                 return;
78
79                         if (value == 2)
80                                 break;
81
82                         change_bit(code, dev->key);
83
84                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
85                                 dev->repeat_key = code;
86                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
87                         }
88
89                         break;
90
91                 case EV_SW:
92
93                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
94                                 return;
95
96                         change_bit(code, dev->sw);
97
98                         break;
99
100                 case EV_ABS:
101
102                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
103                                 return;
104
105                         if (dev->absfuzz[code]) {
106                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
107                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
108                                         return;
109
110                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
111                                     (value < dev->abs[code] + dev->absfuzz[code]))
112                                         value = (dev->abs[code] * 3 + value) >> 2;
113
114                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
115                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
116                                         value = (dev->abs[code] + value) >> 1;
117                         }
118
119                         if (dev->abs[code] == value)
120                                 return;
121
122                         dev->abs[code] = value;
123                         break;
124
125                 case EV_REL:
126
127                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
128                                 return;
129
130                         break;
131
132                 case EV_MSC:
133
134                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
135                                 return;
136
137                         if (dev->event)
138                                 dev->event(dev, type, code, value);
139
140                         break;
141
142                 case EV_LED:
143
144                         if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
145                                 return;
146
147                         change_bit(code, dev->led);
148
149                         if (dev->event)
150                                 dev->event(dev, type, code, value);
151
152                         break;
153
154                 case EV_SND:
155
156                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
157                                 return;
158
159                         if (!!test_bit(code, dev->snd) != !!value)
160                                 change_bit(code, dev->snd);
161
162                         if (dev->event)
163                                 dev->event(dev, type, code, value);
164
165                         break;
166
167                 case EV_REP:
168
169                         if (code > REP_MAX || value < 0 || dev->rep[code] == value)
170                                 return;
171
172                         dev->rep[code] = value;
173                         if (dev->event)
174                                 dev->event(dev, type, code, value);
175
176                         break;
177
178                 case EV_FF:
179
180                         if (value < 0)
181                                 return;
182
183                         if (dev->event)
184                                 dev->event(dev, type, code, value);
185                         break;
186         }
187
188         if (type != EV_SYN)
189                 dev->sync = 0;
190
191         if (dev->grab)
192                 dev->grab->handler->event(dev->grab, type, code, value);
193         else
194                 list_for_each_entry(handle, &dev->h_list, d_node)
195                         if (handle->open)
196                                 handle->handler->event(handle, type, code, value);
197 }
198 EXPORT_SYMBOL(input_event);
199
200 /**
201  * input_inject_event() - send input event from input handler
202  * @handle: input handle to send event through
203  * @type: type of the event
204  * @code: event code
205  * @value: value of the event
206  *
207  * Similar to input_event() but will ignore event if device is "grabbed" and handle
208  * injecting event is not the one that owns the device.
209  */
210 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
211 {
212         if (!handle->dev->grab || handle->dev->grab == handle)
213                 input_event(handle->dev, type, code, value);
214 }
215 EXPORT_SYMBOL(input_inject_event);
216
217 static void input_repeat_key(unsigned long data)
218 {
219         struct input_dev *dev = (void *) data;
220
221         if (!test_bit(dev->repeat_key, dev->key))
222                 return;
223
224         input_event(dev, EV_KEY, dev->repeat_key, 2);
225         input_sync(dev);
226
227         if (dev->rep[REP_PERIOD])
228                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
229 }
230
231 int input_grab_device(struct input_handle *handle)
232 {
233         if (handle->dev->grab)
234                 return -EBUSY;
235
236         handle->dev->grab = handle;
237         return 0;
238 }
239 EXPORT_SYMBOL(input_grab_device);
240
241 void input_release_device(struct input_handle *handle)
242 {
243         struct input_dev *dev = handle->dev;
244
245         if (dev->grab == handle) {
246                 dev->grab = NULL;
247
248                 list_for_each_entry(handle, &dev->h_list, d_node)
249                         if (handle->handler->start)
250                                 handle->handler->start(handle);
251         }
252 }
253 EXPORT_SYMBOL(input_release_device);
254
255 int input_open_device(struct input_handle *handle)
256 {
257         struct input_dev *dev = handle->dev;
258         int err;
259
260         err = mutex_lock_interruptible(&dev->mutex);
261         if (err)
262                 return err;
263
264         handle->open++;
265
266         if (!dev->users++ && dev->open)
267                 err = dev->open(dev);
268
269         if (err)
270                 handle->open--;
271
272         mutex_unlock(&dev->mutex);
273
274         return err;
275 }
276 EXPORT_SYMBOL(input_open_device);
277
278 int input_flush_device(struct input_handle* handle, struct file* file)
279 {
280         if (handle->dev->flush)
281                 return handle->dev->flush(handle->dev, file);
282
283         return 0;
284 }
285 EXPORT_SYMBOL(input_flush_device);
286
287 void input_close_device(struct input_handle *handle)
288 {
289         struct input_dev *dev = handle->dev;
290
291         input_release_device(handle);
292
293         mutex_lock(&dev->mutex);
294
295         if (!--dev->users && dev->close)
296                 dev->close(dev);
297         handle->open--;
298
299         mutex_unlock(&dev->mutex);
300 }
301 EXPORT_SYMBOL(input_close_device);
302
303 static void input_link_handle(struct input_handle *handle)
304 {
305         list_add_tail(&handle->d_node, &handle->dev->h_list);
306         list_add_tail(&handle->h_node, &handle->handler->h_list);
307 }
308
309 #define MATCH_BIT(bit, max) \
310                 for (i = 0; i < NBITS(max); i++) \
311                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
312                                 break; \
313                 if (i != NBITS(max)) \
314                         continue;
315
316 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
317 {
318         int i;
319
320         for (; id->flags || id->driver_info; id++) {
321
322                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
323                         if (id->bustype != dev->id.bustype)
324                                 continue;
325
326                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
327                         if (id->vendor != dev->id.vendor)
328                                 continue;
329
330                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
331                         if (id->product != dev->id.product)
332                                 continue;
333
334                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
335                         if (id->version != dev->id.version)
336                                 continue;
337
338                 MATCH_BIT(evbit,  EV_MAX);
339                 MATCH_BIT(keybit, KEY_MAX);
340                 MATCH_BIT(relbit, REL_MAX);
341                 MATCH_BIT(absbit, ABS_MAX);
342                 MATCH_BIT(mscbit, MSC_MAX);
343                 MATCH_BIT(ledbit, LED_MAX);
344                 MATCH_BIT(sndbit, SND_MAX);
345                 MATCH_BIT(ffbit,  FF_MAX);
346                 MATCH_BIT(swbit,  SW_MAX);
347
348                 return id;
349         }
350
351         return NULL;
352 }
353
354 #ifdef CONFIG_PROC_FS
355
356 static struct proc_dir_entry *proc_bus_input_dir;
357 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
358 static int input_devices_state;
359
360 static inline void input_wakeup_procfs_readers(void)
361 {
362         input_devices_state++;
363         wake_up(&input_devices_poll_wait);
364 }
365
366 static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
367 {
368         int state = input_devices_state;
369
370         poll_wait(file, &input_devices_poll_wait, wait);
371         if (state != input_devices_state)
372                 return POLLIN | POLLRDNORM;
373
374         return 0;
375 }
376
377 static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
378 {
379         struct list_head *node;
380         loff_t i = 0;
381
382         list_for_each(node, list)
383                 if (i++ == *pos)
384                         return node;
385
386         return NULL;
387 }
388
389 static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
390 {
391         if (element->next == list)
392                 return NULL;
393
394         ++(*pos);
395         return element->next;
396 }
397
398 static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
399 {
400         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
401
402         return list_get_nth_element(&input_dev_list, pos);
403 }
404
405 static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
406 {
407         return list_get_next_element(&input_dev_list, v, pos);
408 }
409
410 static void input_devices_seq_stop(struct seq_file *seq, void *v)
411 {
412         /* release lock here */
413 }
414
415 static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
416                                    unsigned long *bitmap, int max)
417 {
418         int i;
419
420         for (i = NBITS(max) - 1; i > 0; i--)
421                 if (bitmap[i])
422                         break;
423
424         seq_printf(seq, "B: %s=", name);
425         for (; i >= 0; i--)
426                 seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
427         seq_putc(seq, '\n');
428 }
429
430 static int input_devices_seq_show(struct seq_file *seq, void *v)
431 {
432         struct input_dev *dev = container_of(v, struct input_dev, node);
433         const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
434         struct input_handle *handle;
435
436         seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
437                    dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
438
439         seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
440         seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
441         seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
442         seq_printf(seq, "H: Handlers=");
443
444         list_for_each_entry(handle, &dev->h_list, d_node)
445                 seq_printf(seq, "%s ", handle->name);
446         seq_putc(seq, '\n');
447
448         input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
449         if (test_bit(EV_KEY, dev->evbit))
450                 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
451         if (test_bit(EV_REL, dev->evbit))
452                 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
453         if (test_bit(EV_ABS, dev->evbit))
454                 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
455         if (test_bit(EV_MSC, dev->evbit))
456                 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
457         if (test_bit(EV_LED, dev->evbit))
458                 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
459         if (test_bit(EV_SND, dev->evbit))
460                 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
461         if (test_bit(EV_FF, dev->evbit))
462                 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
463         if (test_bit(EV_SW, dev->evbit))
464                 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
465
466         seq_putc(seq, '\n');
467
468         kfree(path);
469         return 0;
470 }
471
472 static struct seq_operations input_devices_seq_ops = {
473         .start  = input_devices_seq_start,
474         .next   = input_devices_seq_next,
475         .stop   = input_devices_seq_stop,
476         .show   = input_devices_seq_show,
477 };
478
479 static int input_proc_devices_open(struct inode *inode, struct file *file)
480 {
481         return seq_open(file, &input_devices_seq_ops);
482 }
483
484 static struct file_operations input_devices_fileops = {
485         .owner          = THIS_MODULE,
486         .open           = input_proc_devices_open,
487         .poll           = input_proc_devices_poll,
488         .read           = seq_read,
489         .llseek         = seq_lseek,
490         .release        = seq_release,
491 };
492
493 static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
494 {
495         /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
496         seq->private = (void *)(unsigned long)*pos;
497         return list_get_nth_element(&input_handler_list, pos);
498 }
499
500 static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
501 {
502         seq->private = (void *)(unsigned long)(*pos + 1);
503         return list_get_next_element(&input_handler_list, v, pos);
504 }
505
506 static void input_handlers_seq_stop(struct seq_file *seq, void *v)
507 {
508         /* release lock here */
509 }
510
511 static int input_handlers_seq_show(struct seq_file *seq, void *v)
512 {
513         struct input_handler *handler = container_of(v, struct input_handler, node);
514
515         seq_printf(seq, "N: Number=%ld Name=%s",
516                    (unsigned long)seq->private, handler->name);
517         if (handler->fops)
518                 seq_printf(seq, " Minor=%d", handler->minor);
519         seq_putc(seq, '\n');
520
521         return 0;
522 }
523 static struct seq_operations input_handlers_seq_ops = {
524         .start  = input_handlers_seq_start,
525         .next   = input_handlers_seq_next,
526         .stop   = input_handlers_seq_stop,
527         .show   = input_handlers_seq_show,
528 };
529
530 static int input_proc_handlers_open(struct inode *inode, struct file *file)
531 {
532         return seq_open(file, &input_handlers_seq_ops);
533 }
534
535 static struct file_operations input_handlers_fileops = {
536         .owner          = THIS_MODULE,
537         .open           = input_proc_handlers_open,
538         .read           = seq_read,
539         .llseek         = seq_lseek,
540         .release        = seq_release,
541 };
542
543 static int __init input_proc_init(void)
544 {
545         struct proc_dir_entry *entry;
546
547         proc_bus_input_dir = proc_mkdir("input", proc_bus);
548         if (!proc_bus_input_dir)
549                 return -ENOMEM;
550
551         proc_bus_input_dir->owner = THIS_MODULE;
552
553         entry = create_proc_entry("devices", 0, proc_bus_input_dir);
554         if (!entry)
555                 goto fail1;
556
557         entry->owner = THIS_MODULE;
558         entry->proc_fops = &input_devices_fileops;
559
560         entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
561         if (!entry)
562                 goto fail2;
563
564         entry->owner = THIS_MODULE;
565         entry->proc_fops = &input_handlers_fileops;
566
567         return 0;
568
569  fail2: remove_proc_entry("devices", proc_bus_input_dir);
570  fail1: remove_proc_entry("input", proc_bus);
571         return -ENOMEM;
572 }
573
574 static void input_proc_exit(void)
575 {
576         remove_proc_entry("devices", proc_bus_input_dir);
577         remove_proc_entry("handlers", proc_bus_input_dir);
578         remove_proc_entry("input", proc_bus);
579 }
580
581 #else /* !CONFIG_PROC_FS */
582 static inline void input_wakeup_procfs_readers(void) { }
583 static inline int input_proc_init(void) { return 0; }
584 static inline void input_proc_exit(void) { }
585 #endif
586
587 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
588 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
589 {                                                                               \
590         struct input_dev *input_dev = to_input_dev(dev);                        \
591         int retval;                                                             \
592                                                                                 \
593         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
594         if (retval)                                                             \
595                 return retval;                                                  \
596                                                                                 \
597         retval = scnprintf(buf, PAGE_SIZE,                                      \
598                            "%s\n", input_dev->name ? input_dev->name : "");     \
599                                                                                 \
600         mutex_unlock(&input_dev->mutex);                                        \
601                                                                                 \
602         return retval;                                                          \
603 }                                                                               \
604 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
605
606 INPUT_DEV_STRING_ATTR_SHOW(name);
607 INPUT_DEV_STRING_ATTR_SHOW(phys);
608 INPUT_DEV_STRING_ATTR_SHOW(uniq);
609
610 static int input_print_modalias_bits(char *buf, int size,
611                                      char name, unsigned long *bm,
612                                      unsigned int min_bit, unsigned int max_bit)
613 {
614         int len = 0, i;
615
616         len += snprintf(buf, max(size, 0), "%c", name);
617         for (i = min_bit; i < max_bit; i++)
618                 if (bm[LONG(i)] & BIT(i))
619                         len += snprintf(buf + len, max(size - len, 0), "%X,", i);
620         return len;
621 }
622
623 static int input_print_modalias(char *buf, int size, struct input_dev *id,
624                                 int add_cr)
625 {
626         int len;
627
628         len = snprintf(buf, max(size, 0),
629                        "input:b%04Xv%04Xp%04Xe%04X-",
630                        id->id.bustype, id->id.vendor,
631                        id->id.product, id->id.version);
632
633         len += input_print_modalias_bits(buf + len, size - len,
634                                 'e', id->evbit, 0, EV_MAX);
635         len += input_print_modalias_bits(buf + len, size - len,
636                                 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
637         len += input_print_modalias_bits(buf + len, size - len,
638                                 'r', id->relbit, 0, REL_MAX);
639         len += input_print_modalias_bits(buf + len, size - len,
640                                 'a', id->absbit, 0, ABS_MAX);
641         len += input_print_modalias_bits(buf + len, size - len,
642                                 'm', id->mscbit, 0, MSC_MAX);
643         len += input_print_modalias_bits(buf + len, size - len,
644                                 'l', id->ledbit, 0, LED_MAX);
645         len += input_print_modalias_bits(buf + len, size - len,
646                                 's', id->sndbit, 0, SND_MAX);
647         len += input_print_modalias_bits(buf + len, size - len,
648                                 'f', id->ffbit, 0, FF_MAX);
649         len += input_print_modalias_bits(buf + len, size - len,
650                                 'w', id->swbit, 0, SW_MAX);
651
652         if (add_cr)
653                 len += snprintf(buf + len, max(size - len, 0), "\n");
654
655         return len;
656 }
657
658 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
659 {
660         struct input_dev *id = to_input_dev(dev);
661         ssize_t len;
662
663         len = input_print_modalias(buf, PAGE_SIZE, id, 1);
664
665         return min_t(int, len, PAGE_SIZE);
666 }
667 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
668
669 static struct attribute *input_dev_attrs[] = {
670         &class_device_attr_name.attr,
671         &class_device_attr_phys.attr,
672         &class_device_attr_uniq.attr,
673         &class_device_attr_modalias.attr,
674         NULL
675 };
676
677 static struct attribute_group input_dev_attr_group = {
678         .attrs  = input_dev_attrs,
679 };
680
681 #define INPUT_DEV_ID_ATTR(name)                                                 \
682 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
683 {                                                                               \
684         struct input_dev *input_dev = to_input_dev(dev);                        \
685         return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name);         \
686 }                                                                               \
687 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
688
689 INPUT_DEV_ID_ATTR(bustype);
690 INPUT_DEV_ID_ATTR(vendor);
691 INPUT_DEV_ID_ATTR(product);
692 INPUT_DEV_ID_ATTR(version);
693
694 static struct attribute *input_dev_id_attrs[] = {
695         &class_device_attr_bustype.attr,
696         &class_device_attr_vendor.attr,
697         &class_device_attr_product.attr,
698         &class_device_attr_version.attr,
699         NULL
700 };
701
702 static struct attribute_group input_dev_id_attr_group = {
703         .name   = "id",
704         .attrs  = input_dev_id_attrs,
705 };
706
707 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
708                               int max, int add_cr)
709 {
710         int i;
711         int len = 0;
712
713         for (i = NBITS(max) - 1; i > 0; i--)
714                 if (bitmap[i])
715                         break;
716
717         for (; i >= 0; i--)
718                 len += snprintf(buf + len, max(buf_size - len, 0),
719                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
720
721         if (add_cr)
722                 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
723
724         return len;
725 }
726
727 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
728 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
729 {                                                                               \
730         struct input_dev *input_dev = to_input_dev(dev);                        \
731         int len = input_print_bitmap(buf, PAGE_SIZE,                            \
732                                      input_dev->bm##bit, ev##_MAX, 1);          \
733         return min_t(int, len, PAGE_SIZE);                                      \
734 }                                                                               \
735 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
736
737 INPUT_DEV_CAP_ATTR(EV, ev);
738 INPUT_DEV_CAP_ATTR(KEY, key);
739 INPUT_DEV_CAP_ATTR(REL, rel);
740 INPUT_DEV_CAP_ATTR(ABS, abs);
741 INPUT_DEV_CAP_ATTR(MSC, msc);
742 INPUT_DEV_CAP_ATTR(LED, led);
743 INPUT_DEV_CAP_ATTR(SND, snd);
744 INPUT_DEV_CAP_ATTR(FF, ff);
745 INPUT_DEV_CAP_ATTR(SW, sw);
746
747 static struct attribute *input_dev_caps_attrs[] = {
748         &class_device_attr_ev.attr,
749         &class_device_attr_key.attr,
750         &class_device_attr_rel.attr,
751         &class_device_attr_abs.attr,
752         &class_device_attr_msc.attr,
753         &class_device_attr_led.attr,
754         &class_device_attr_snd.attr,
755         &class_device_attr_ff.attr,
756         &class_device_attr_sw.attr,
757         NULL
758 };
759
760 static struct attribute_group input_dev_caps_attr_group = {
761         .name   = "capabilities",
762         .attrs  = input_dev_caps_attrs,
763 };
764
765 static void input_dev_release(struct class_device *class_dev)
766 {
767         struct input_dev *dev = to_input_dev(class_dev);
768
769         input_ff_destroy(dev);
770         kfree(dev);
771
772         module_put(THIS_MODULE);
773 }
774
775 /*
776  * Input uevent interface - loading event handlers based on
777  * device bitfields.
778  */
779 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
780                                    char *buffer, int buffer_size, int *cur_len,
781                                    const char *name, unsigned long *bitmap, int max)
782 {
783         if (*cur_index >= num_envp - 1)
784                 return -ENOMEM;
785
786         envp[*cur_index] = buffer + *cur_len;
787
788         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
789         if (*cur_len >= buffer_size)
790                 return -ENOMEM;
791
792         *cur_len += input_print_bitmap(buffer + *cur_len,
793                                         max(buffer_size - *cur_len, 0),
794                                         bitmap, max, 0) + 1;
795         if (*cur_len > buffer_size)
796                 return -ENOMEM;
797
798         (*cur_index)++;
799         return 0;
800 }
801
802 static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
803                                          char *buffer, int buffer_size, int *cur_len,
804                                          struct input_dev *dev)
805 {
806         if (*cur_index >= num_envp - 1)
807                 return -ENOMEM;
808
809         envp[*cur_index] = buffer + *cur_len;
810
811         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
812                              "MODALIAS=");
813         if (*cur_len >= buffer_size)
814                 return -ENOMEM;
815
816         *cur_len += input_print_modalias(buffer + *cur_len,
817                                          max(buffer_size - *cur_len, 0),
818                                          dev, 0) + 1;
819         if (*cur_len > buffer_size)
820                 return -ENOMEM;
821
822         (*cur_index)++;
823         return 0;
824 }
825
826 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
827         do {                                                            \
828                 int err = add_uevent_var(envp, num_envp, &i,            \
829                                         buffer, buffer_size, &len,      \
830                                         fmt, val);                      \
831                 if (err)                                                \
832                         return err;                                     \
833         } while (0)
834
835 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
836         do {                                                            \
837                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
838                                         buffer, buffer_size, &len,      \
839                                         name, bm, max);                 \
840                 if (err)                                                \
841                         return err;                                     \
842         } while (0)
843
844 #define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev)                             \
845         do {                                                            \
846                 int err = input_add_uevent_modalias_var(envp,           \
847                                         num_envp, &i,                   \
848                                         buffer, buffer_size, &len,      \
849                                         dev);                           \
850                 if (err)                                                \
851                         return err;                                     \
852         } while (0)
853
854 static int input_dev_uevent(struct class_device *cdev, char **envp,
855                             int num_envp, char *buffer, int buffer_size)
856 {
857         struct input_dev *dev = to_input_dev(cdev);
858         int i = 0;
859         int len = 0;
860
861         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
862                                 dev->id.bustype, dev->id.vendor,
863                                 dev->id.product, dev->id.version);
864         if (dev->name)
865                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
866         if (dev->phys)
867                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
868         if (dev->uniq)
869                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
870
871         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
872         if (test_bit(EV_KEY, dev->evbit))
873                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
874         if (test_bit(EV_REL, dev->evbit))
875                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
876         if (test_bit(EV_ABS, dev->evbit))
877                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
878         if (test_bit(EV_MSC, dev->evbit))
879                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
880         if (test_bit(EV_LED, dev->evbit))
881                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
882         if (test_bit(EV_SND, dev->evbit))
883                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
884         if (test_bit(EV_FF, dev->evbit))
885                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
886         if (test_bit(EV_SW, dev->evbit))
887                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
888
889         INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
890
891         envp[i] = NULL;
892         return 0;
893 }
894
895 struct class input_class = {
896         .name                   = "input",
897         .release                = input_dev_release,
898         .uevent                 = input_dev_uevent,
899 };
900 EXPORT_SYMBOL_GPL(input_class);
901
902 struct input_dev *input_allocate_device(void)
903 {
904         struct input_dev *dev;
905
906         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
907         if (dev) {
908                 dev->dynalloc = 1;
909                 dev->cdev.class = &input_class;
910                 class_device_initialize(&dev->cdev);
911                 mutex_init(&dev->mutex);
912                 INIT_LIST_HEAD(&dev->h_list);
913                 INIT_LIST_HEAD(&dev->node);
914         }
915
916         return dev;
917 }
918 EXPORT_SYMBOL(input_allocate_device);
919
920 void input_free_device(struct input_dev *dev)
921 {
922         if (dev) {
923
924                 mutex_lock(&dev->mutex);
925                 dev->name = dev->phys = dev->uniq = NULL;
926                 mutex_unlock(&dev->mutex);
927
928                 input_put_device(dev);
929         }
930 }
931 EXPORT_SYMBOL(input_free_device);
932
933 int input_register_device(struct input_dev *dev)
934 {
935         static atomic_t input_no = ATOMIC_INIT(0);
936         struct input_handle *handle;
937         struct input_handler *handler;
938         struct input_device_id *id;
939         const char *path;
940         int error;
941
942         if (!dev->dynalloc) {
943                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
944                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
945                         dev->name ? dev->name : "<Unknown>");
946                 return -EINVAL;
947         }
948
949         set_bit(EV_SYN, dev->evbit);
950
951         /*
952          * If delay and period are pre-set by the driver, then autorepeating
953          * is handled by the driver itself and we don't do it in input.c.
954          */
955
956         init_timer(&dev->timer);
957         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
958                 dev->timer.data = (long) dev;
959                 dev->timer.function = input_repeat_key;
960                 dev->rep[REP_DELAY] = 250;
961                 dev->rep[REP_PERIOD] = 33;
962         }
963
964         INIT_LIST_HEAD(&dev->h_list);
965         list_add_tail(&dev->node, &input_dev_list);
966
967         dev->cdev.class = &input_class;
968         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
969                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
970
971         error = class_device_add(&dev->cdev);
972         if (error)
973                 return error;
974
975         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
976         if (error)
977                 goto fail1;
978
979         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
980         if (error)
981                 goto fail2;
982
983         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
984         if (error)
985                 goto fail3;
986
987         __module_get(THIS_MODULE);
988
989         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
990         printk(KERN_INFO "input: %s as %s\n",
991                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
992         kfree(path);
993
994         list_for_each_entry(handler, &input_handler_list, node)
995                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
996                         if ((id = input_match_device(handler->id_table, dev)))
997                                 if ((handle = handler->connect(handler, dev, id))) {
998                                         input_link_handle(handle);
999                                         if (handler->start)
1000                                                 handler->start(handle);
1001                                 }
1002
1003         input_wakeup_procfs_readers();
1004
1005         return 0;
1006
1007  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1008  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1009  fail1: class_device_del(&dev->cdev);
1010         return error;
1011 }
1012 EXPORT_SYMBOL(input_register_device);
1013
1014 void input_unregister_device(struct input_dev *dev)
1015 {
1016         struct list_head *node, *next;
1017         int code;
1018
1019         for (code = 0; code <= KEY_MAX; code++)
1020                 if (test_bit(code, dev->key))
1021                         input_report_key(dev, code, 0);
1022         input_sync(dev);
1023
1024         del_timer_sync(&dev->timer);
1025
1026         list_for_each_safe(node, next, &dev->h_list) {
1027                 struct input_handle * handle = to_handle(node);
1028                 list_del_init(&handle->d_node);
1029                 list_del_init(&handle->h_node);
1030                 handle->handler->disconnect(handle);
1031         }
1032
1033         list_del_init(&dev->node);
1034
1035         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
1036         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
1037         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
1038
1039         mutex_lock(&dev->mutex);
1040         dev->name = dev->phys = dev->uniq = NULL;
1041         mutex_unlock(&dev->mutex);
1042
1043         class_device_unregister(&dev->cdev);
1044
1045         input_wakeup_procfs_readers();
1046 }
1047 EXPORT_SYMBOL(input_unregister_device);
1048
1049 void input_register_handler(struct input_handler *handler)
1050 {
1051         struct input_dev *dev;
1052         struct input_handle *handle;
1053         struct input_device_id *id;
1054
1055         if (!handler)
1056                 return;
1057
1058         INIT_LIST_HEAD(&handler->h_list);
1059
1060         if (handler->fops != NULL)
1061                 input_table[handler->minor >> 5] = handler;
1062
1063         list_add_tail(&handler->node, &input_handler_list);
1064
1065         list_for_each_entry(dev, &input_dev_list, node)
1066                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
1067                         if ((id = input_match_device(handler->id_table, dev)))
1068                                 if ((handle = handler->connect(handler, dev, id))) {
1069                                         input_link_handle(handle);
1070                                         if (handler->start)
1071                                                 handler->start(handle);
1072                                 }
1073
1074         input_wakeup_procfs_readers();
1075 }
1076 EXPORT_SYMBOL(input_register_handler);
1077
1078 void input_unregister_handler(struct input_handler *handler)
1079 {
1080         struct list_head *node, *next;
1081
1082         list_for_each_safe(node, next, &handler->h_list) {
1083                 struct input_handle * handle = to_handle_h(node);
1084                 list_del_init(&handle->h_node);
1085                 list_del_init(&handle->d_node);
1086                 handler->disconnect(handle);
1087         }
1088
1089         list_del_init(&handler->node);
1090
1091         if (handler->fops != NULL)
1092                 input_table[handler->minor >> 5] = NULL;
1093
1094         input_wakeup_procfs_readers();
1095 }
1096 EXPORT_SYMBOL(input_unregister_handler);
1097
1098 static int input_open_file(struct inode *inode, struct file *file)
1099 {
1100         struct input_handler *handler = input_table[iminor(inode) >> 5];
1101         const struct file_operations *old_fops, *new_fops = NULL;
1102         int err;
1103
1104         /* No load-on-demand here? */
1105         if (!handler || !(new_fops = fops_get(handler->fops)))
1106                 return -ENODEV;
1107
1108         /*
1109          * That's _really_ odd. Usually NULL ->open means "nothing special",
1110          * not "no device". Oh, well...
1111          */
1112         if (!new_fops->open) {
1113                 fops_put(new_fops);
1114                 return -ENODEV;
1115         }
1116         old_fops = file->f_op;
1117         file->f_op = new_fops;
1118
1119         err = new_fops->open(inode, file);
1120
1121         if (err) {
1122                 fops_put(file->f_op);
1123                 file->f_op = fops_get(old_fops);
1124         }
1125         fops_put(old_fops);
1126         return err;
1127 }
1128
1129 static struct file_operations input_fops = {
1130         .owner = THIS_MODULE,
1131         .open = input_open_file,
1132 };
1133
1134 static int __init input_init(void)
1135 {
1136         int err;
1137
1138         err = class_register(&input_class);
1139         if (err) {
1140                 printk(KERN_ERR "input: unable to register input_dev class\n");
1141                 return err;
1142         }
1143
1144         err = input_proc_init();
1145         if (err)
1146                 goto fail1;
1147
1148         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
1149         if (err) {
1150                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
1151                 goto fail2;
1152         }
1153
1154         return 0;
1155
1156  fail2: input_proc_exit();
1157  fail1: class_unregister(&input_class);
1158         return err;
1159 }
1160
1161 static void __exit input_exit(void)
1162 {
1163         input_proc_exit();
1164         unregister_chrdev(INPUT_MAJOR, "input");
1165         class_unregister(&input_class);
1166 }
1167
1168 subsys_initcall(input_init);
1169 module_exit(input_exit);