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