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