Manual merge with Linus.
[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/interrupt.h>
22 #include <linux/poll.h>
23 #include <linux/device.h>
24 #include <linux/mutex.h>
25
26 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
27 MODULE_DESCRIPTION("Input core");
28 MODULE_LICENSE("GPL");
29
30 EXPORT_SYMBOL(input_allocate_device);
31 EXPORT_SYMBOL(input_register_device);
32 EXPORT_SYMBOL(input_unregister_device);
33 EXPORT_SYMBOL(input_register_handler);
34 EXPORT_SYMBOL(input_unregister_handler);
35 EXPORT_SYMBOL(input_grab_device);
36 EXPORT_SYMBOL(input_release_device);
37 EXPORT_SYMBOL(input_open_device);
38 EXPORT_SYMBOL(input_close_device);
39 EXPORT_SYMBOL(input_accept_process);
40 EXPORT_SYMBOL(input_flush_device);
41 EXPORT_SYMBOL(input_event);
42 EXPORT_SYMBOL_GPL(input_class);
43
44 #define INPUT_DEVICES   256
45
46 static LIST_HEAD(input_dev_list);
47 static LIST_HEAD(input_handler_list);
48
49 static struct input_handler *input_table[8];
50
51 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
52 {
53         struct input_handle *handle;
54
55         if (type > EV_MAX || !test_bit(type, dev->evbit))
56                 return;
57
58         add_input_randomness(type, code, value);
59
60         switch (type) {
61
62                 case EV_SYN:
63                         switch (code) {
64                                 case SYN_CONFIG:
65                                         if (dev->event) dev->event(dev, type, code, value);
66                                         break;
67
68                                 case SYN_REPORT:
69                                         if (dev->sync) return;
70                                         dev->sync = 1;
71                                         break;
72                         }
73                         break;
74
75                 case EV_KEY:
76
77                         if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
78                                 return;
79
80                         if (value == 2)
81                                 break;
82
83                         change_bit(code, dev->key);
84
85                         if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
86                                 dev->repeat_key = code;
87                                 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
88                         }
89
90                         break;
91
92                 case EV_SW:
93
94                         if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
95                                 return;
96
97                         change_bit(code, dev->sw);
98
99                         break;
100
101                 case EV_ABS:
102
103                         if (code > ABS_MAX || !test_bit(code, dev->absbit))
104                                 return;
105
106                         if (dev->absfuzz[code]) {
107                                 if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
108                                     (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
109                                         return;
110
111                                 if ((value > dev->abs[code] - dev->absfuzz[code]) &&
112                                     (value < dev->abs[code] + dev->absfuzz[code]))
113                                         value = (dev->abs[code] * 3 + value) >> 2;
114
115                                 if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
116                                     (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
117                                         value = (dev->abs[code] + value) >> 1;
118                         }
119
120                         if (dev->abs[code] == value)
121                                 return;
122
123                         dev->abs[code] = value;
124                         break;
125
126                 case EV_REL:
127
128                         if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
129                                 return;
130
131                         break;
132
133                 case EV_MSC:
134
135                         if (code > MSC_MAX || !test_bit(code, dev->mscbit))
136                                 return;
137
138                         if (dev->event) 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                         if (dev->event) dev->event(dev, type, code, value);
149
150                         break;
151
152                 case EV_SND:
153
154                         if (code > SND_MAX || !test_bit(code, dev->sndbit))
155                                 return;
156
157                         if (dev->event) dev->event(dev, type, code, value);
158
159                         break;
160
161                 case EV_REP:
162
163                         if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
164
165                         dev->rep[code] = value;
166                         if (dev->event) dev->event(dev, type, code, value);
167
168                         break;
169
170                 case EV_FF:
171                         if (dev->event) dev->event(dev, type, code, value);
172                         break;
173         }
174
175         if (type != EV_SYN)
176                 dev->sync = 0;
177
178         if (dev->grab)
179                 dev->grab->handler->event(dev->grab, type, code, value);
180         else
181                 list_for_each_entry(handle, &dev->h_list, d_node)
182                         if (handle->open)
183                                 handle->handler->event(handle, type, code, value);
184 }
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
208 int input_grab_device(struct input_handle *handle)
209 {
210         if (handle->dev->grab)
211                 return -EBUSY;
212
213         handle->dev->grab = handle;
214         return 0;
215 }
216
217 void input_release_device(struct input_handle *handle)
218 {
219         if (handle->dev->grab == handle)
220                 handle->dev->grab = NULL;
221 }
222
223 int input_open_device(struct input_handle *handle)
224 {
225         struct input_dev *dev = handle->dev;
226         int err;
227
228         err = mutex_lock_interruptible(&dev->mutex);
229         if (err)
230                 return err;
231
232         handle->open++;
233
234         if (!dev->users++ && dev->open)
235                 err = dev->open(dev);
236
237         if (err)
238                 handle->open--;
239
240         mutex_unlock(&dev->mutex);
241
242         return err;
243 }
244
245 int input_flush_device(struct input_handle* handle, struct file* file)
246 {
247         if (handle->dev->flush)
248                 return handle->dev->flush(handle->dev, file);
249
250         return 0;
251 }
252
253 void input_close_device(struct input_handle *handle)
254 {
255         struct input_dev *dev = handle->dev;
256
257         input_release_device(handle);
258
259         mutex_lock(&dev->mutex);
260
261         if (!--dev->users && dev->close)
262                 dev->close(dev);
263         handle->open--;
264
265         mutex_unlock(&dev->mutex);
266 }
267
268 static void input_link_handle(struct input_handle *handle)
269 {
270         list_add_tail(&handle->d_node, &handle->dev->h_list);
271         list_add_tail(&handle->h_node, &handle->handler->h_list);
272 }
273
274 #define MATCH_BIT(bit, max) \
275                 for (i = 0; i < NBITS(max); i++) \
276                         if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
277                                 break; \
278                 if (i != NBITS(max)) \
279                         continue;
280
281 static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
282 {
283         int i;
284
285         for (; id->flags || id->driver_info; id++) {
286
287                 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
288                         if (id->id.bustype != dev->id.bustype)
289                                 continue;
290
291                 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
292                         if (id->id.vendor != dev->id.vendor)
293                                 continue;
294
295                 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
296                         if (id->id.product != dev->id.product)
297                                 continue;
298
299                 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
300                         if (id->id.version != dev->id.version)
301                                 continue;
302
303                 MATCH_BIT(evbit,  EV_MAX);
304                 MATCH_BIT(keybit, KEY_MAX);
305                 MATCH_BIT(relbit, REL_MAX);
306                 MATCH_BIT(absbit, ABS_MAX);
307                 MATCH_BIT(mscbit, MSC_MAX);
308                 MATCH_BIT(ledbit, LED_MAX);
309                 MATCH_BIT(sndbit, SND_MAX);
310                 MATCH_BIT(ffbit,  FF_MAX);
311                 MATCH_BIT(swbit,  SW_MAX);
312
313                 return id;
314         }
315
316         return NULL;
317 }
318
319 static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max)
320 {
321         int i;
322         int len = 0;
323
324         for (i = NBITS(max) - 1; i > 0; i--)
325                 if (bitmap[i])
326                         break;
327
328         for (; i >= 0; i--)
329                 len += snprintf(buf + len, max(buf_size - len, 0),
330                                 "%lx%s", bitmap[i], i > 0 ? " " : "");
331         return len;
332 }
333
334 #ifdef CONFIG_PROC_FS
335
336 static struct proc_dir_entry *proc_bus_input_dir;
337 static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
338 static int input_devices_state;
339
340 static inline void input_wakeup_procfs_readers(void)
341 {
342         input_devices_state++;
343         wake_up(&input_devices_poll_wait);
344 }
345
346 static unsigned int input_devices_poll(struct file *file, poll_table *wait)
347 {
348         int state = input_devices_state;
349         poll_wait(file, &input_devices_poll_wait, wait);
350         if (state != input_devices_state)
351                 return POLLIN | POLLRDNORM;
352         return 0;
353 }
354
355 #define SPRINTF_BIT(ev, bm)                                             \
356         do {                                                            \
357                 len += sprintf(buf + len, "B: %s=", #ev);               \
358                 len += input_print_bitmap(buf + len, INT_MAX,           \
359                                         dev->bm##bit, ev##_MAX);        \
360                 len += sprintf(buf + len, "\n");                        \
361         } while (0)
362
363 #define TEST_AND_SPRINTF_BIT(ev, bm)                                    \
364         do {                                                            \
365                 if (test_bit(EV_##ev, dev->evbit))                      \
366                         SPRINTF_BIT(ev, bm);                            \
367         } while (0)
368
369 static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
370 {
371         struct input_dev *dev;
372         struct input_handle *handle;
373         const char *path;
374
375         off_t at = 0;
376         int len, cnt = 0;
377
378         list_for_each_entry(dev, &input_dev_list, node) {
379
380                 path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
381
382                 len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
383                         dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
384
385                 len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
386                 len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
387                 len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : "");
388                 len += sprintf(buf + len, "H: Handlers=");
389
390                 list_for_each_entry(handle, &dev->h_list, d_node)
391                         len += sprintf(buf + len, "%s ", handle->name);
392
393                 len += sprintf(buf + len, "\n");
394
395                 SPRINTF_BIT(EV, ev);
396                 TEST_AND_SPRINTF_BIT(KEY, key);
397                 TEST_AND_SPRINTF_BIT(REL, rel);
398                 TEST_AND_SPRINTF_BIT(ABS, abs);
399                 TEST_AND_SPRINTF_BIT(MSC, msc);
400                 TEST_AND_SPRINTF_BIT(LED, led);
401                 TEST_AND_SPRINTF_BIT(SND, snd);
402                 TEST_AND_SPRINTF_BIT(FF, ff);
403                 TEST_AND_SPRINTF_BIT(SW, sw);
404
405                 len += sprintf(buf + len, "\n");
406
407                 at += len;
408
409                 if (at >= pos) {
410                         if (!*start) {
411                                 *start = buf + (pos - (at - len));
412                                 cnt = at - pos;
413                         } else  cnt += len;
414                         buf += len;
415                         if (cnt >= count)
416                                 break;
417                 }
418
419                 kfree(path);
420         }
421
422         if (&dev->node == &input_dev_list)
423                 *eof = 1;
424
425         return (count > cnt) ? cnt : count;
426 }
427
428 static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
429 {
430         struct input_handler *handler;
431
432         off_t at = 0;
433         int len = 0, cnt = 0;
434         int i = 0;
435
436         list_for_each_entry(handler, &input_handler_list, node) {
437
438                 if (handler->fops)
439                         len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
440                                 i++, handler->name, handler->minor);
441                 else
442                         len = sprintf(buf, "N: Number=%d Name=%s\n",
443                                 i++, handler->name);
444
445                 at += len;
446
447                 if (at >= pos) {
448                         if (!*start) {
449                                 *start = buf + (pos - (at - len));
450                                 cnt = at - pos;
451                         } else  cnt += len;
452                         buf += len;
453                         if (cnt >= count)
454                                 break;
455                 }
456         }
457         if (&handler->node == &input_handler_list)
458                 *eof = 1;
459
460         return (count > cnt) ? cnt : count;
461 }
462
463 static struct file_operations input_fileops;
464
465 static int __init input_proc_init(void)
466 {
467         struct proc_dir_entry *entry;
468
469         proc_bus_input_dir = proc_mkdir("input", proc_bus);
470         if (!proc_bus_input_dir)
471                 return -ENOMEM;
472
473         proc_bus_input_dir->owner = THIS_MODULE;
474
475         entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
476         if (!entry)
477                 goto fail1;
478
479         entry->owner = THIS_MODULE;
480         input_fileops = *entry->proc_fops;
481         input_fileops.poll = input_devices_poll;
482         entry->proc_fops = &input_fileops;
483
484         entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
485         if (!entry)
486                 goto fail2;
487
488         entry->owner = THIS_MODULE;
489
490         return 0;
491
492  fail2: remove_proc_entry("devices", proc_bus_input_dir);
493  fail1: remove_proc_entry("input", proc_bus);
494         return -ENOMEM;
495 }
496
497 static void input_proc_exit(void)
498 {
499         remove_proc_entry("devices", proc_bus_input_dir);
500         remove_proc_entry("handlers", proc_bus_input_dir);
501         remove_proc_entry("input", proc_bus);
502 }
503
504 #else /* !CONFIG_PROC_FS */
505 static inline void input_wakeup_procfs_readers(void) { }
506 static inline int input_proc_init(void) { return 0; }
507 static inline void input_proc_exit(void) { }
508 #endif
509
510 #define INPUT_DEV_STRING_ATTR_SHOW(name)                                        \
511 static ssize_t input_dev_show_##name(struct class_device *dev, char *buf)       \
512 {                                                                               \
513         struct input_dev *input_dev = to_input_dev(dev);                        \
514         int retval;                                                             \
515                                                                                 \
516         retval = mutex_lock_interruptible(&input_dev->mutex);                   \
517         if (retval)                                                             \
518                 return retval;                                                  \
519                                                                                 \
520         retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : "");  \
521                                                                                 \
522         mutex_unlock(&input_dev->mutex);                                        \
523                                                                                 \
524         return retval;                                                          \
525 }                                                                               \
526 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
527
528 INPUT_DEV_STRING_ATTR_SHOW(name);
529 INPUT_DEV_STRING_ATTR_SHOW(phys);
530 INPUT_DEV_STRING_ATTR_SHOW(uniq);
531
532 static int print_modalias_bits(char *buf, int size, char prefix, unsigned long *arr,
533                                unsigned int min, unsigned int max)
534 {
535         int len, i;
536
537         len = snprintf(buf, size, "%c", prefix);
538         for (i = min; i < max; i++)
539                 if (arr[LONG(i)] & BIT(i))
540                         len += snprintf(buf + len, size - len, "%X,", i);
541         return len;
542 }
543
544 static int print_modalias(char *buf, int size, struct input_dev *id)
545 {
546         int len;
547
548         len = snprintf(buf, size, "input:b%04Xv%04Xp%04Xe%04X-",
549                        id->id.bustype,
550                        id->id.vendor,
551                        id->id.product,
552                        id->id.version);
553
554         len += print_modalias_bits(buf + len, size - len, 'e', id->evbit,
555                                    0, EV_MAX);
556         len += print_modalias_bits(buf + len, size - len, 'k', id->keybit,
557                                    KEY_MIN_INTERESTING, KEY_MAX);
558         len += print_modalias_bits(buf + len, size - len, 'r', id->relbit,
559                                    0, REL_MAX);
560         len += print_modalias_bits(buf + len, size - len, 'a', id->absbit,
561                                    0, ABS_MAX);
562         len += print_modalias_bits(buf + len, size - len, 'm', id->mscbit,
563                                    0, MSC_MAX);
564         len += print_modalias_bits(buf + len, size - len, 'l', id->ledbit,
565                                    0, LED_MAX);
566         len += print_modalias_bits(buf + len, size - len, 's', id->sndbit,
567                                    0, SND_MAX);
568         len += print_modalias_bits(buf + len, size - len, 'f', id->ffbit,
569                                    0, FF_MAX);
570         len += print_modalias_bits(buf + len, size - len, 'w', id->swbit,
571                                    0, SW_MAX);
572         return len;
573 }
574
575 static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
576 {
577         struct input_dev *id = to_input_dev(dev);
578         ssize_t len;
579
580         len = print_modalias(buf, PAGE_SIZE, id);
581         len += snprintf(buf + len, PAGE_SIZE-len, "\n");
582         return len;
583 }
584 static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
585
586 static struct attribute *input_dev_attrs[] = {
587         &class_device_attr_name.attr,
588         &class_device_attr_phys.attr,
589         &class_device_attr_uniq.attr,
590         &class_device_attr_modalias.attr,
591         NULL
592 };
593
594 static struct attribute_group input_dev_attr_group = {
595         .attrs  = input_dev_attrs,
596 };
597
598 #define INPUT_DEV_ID_ATTR(name)                                                 \
599 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
600 {                                                                               \
601         struct input_dev *input_dev = to_input_dev(dev);                        \
602         return sprintf(buf, "%04x\n", input_dev->id.name);                      \
603 }                                                                               \
604 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
605
606 INPUT_DEV_ID_ATTR(bustype);
607 INPUT_DEV_ID_ATTR(vendor);
608 INPUT_DEV_ID_ATTR(product);
609 INPUT_DEV_ID_ATTR(version);
610
611 static struct attribute *input_dev_id_attrs[] = {
612         &class_device_attr_bustype.attr,
613         &class_device_attr_vendor.attr,
614         &class_device_attr_product.attr,
615         &class_device_attr_version.attr,
616         NULL
617 };
618
619 static struct attribute_group input_dev_id_attr_group = {
620         .name   = "id",
621         .attrs  = input_dev_id_attrs,
622 };
623
624 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
625 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
626 {                                                                               \
627         struct input_dev *input_dev = to_input_dev(dev);                        \
628         return input_print_bitmap(buf, PAGE_SIZE, input_dev->bm##bit, ev##_MAX);\
629 }                                                                               \
630 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
631
632 INPUT_DEV_CAP_ATTR(EV, ev);
633 INPUT_DEV_CAP_ATTR(KEY, key);
634 INPUT_DEV_CAP_ATTR(REL, rel);
635 INPUT_DEV_CAP_ATTR(ABS, abs);
636 INPUT_DEV_CAP_ATTR(MSC, msc);
637 INPUT_DEV_CAP_ATTR(LED, led);
638 INPUT_DEV_CAP_ATTR(SND, snd);
639 INPUT_DEV_CAP_ATTR(FF, ff);
640 INPUT_DEV_CAP_ATTR(SW, sw);
641
642 static struct attribute *input_dev_caps_attrs[] = {
643         &class_device_attr_ev.attr,
644         &class_device_attr_key.attr,
645         &class_device_attr_rel.attr,
646         &class_device_attr_abs.attr,
647         &class_device_attr_msc.attr,
648         &class_device_attr_led.attr,
649         &class_device_attr_snd.attr,
650         &class_device_attr_ff.attr,
651         &class_device_attr_sw.attr,
652         NULL
653 };
654
655 static struct attribute_group input_dev_caps_attr_group = {
656         .name   = "capabilities",
657         .attrs  = input_dev_caps_attrs,
658 };
659
660 static void input_dev_release(struct class_device *class_dev)
661 {
662         struct input_dev *dev = to_input_dev(class_dev);
663
664         kfree(dev);
665         module_put(THIS_MODULE);
666 }
667
668 /*
669  * Input uevent interface - loading event handlers based on
670  * device bitfields.
671  */
672 static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
673                                     char *buffer, int buffer_size, int *cur_len,
674                                     const char *name, unsigned long *bitmap, int max)
675 {
676         if (*cur_index >= num_envp - 1)
677                 return -ENOMEM;
678
679         envp[*cur_index] = buffer + *cur_len;
680
681         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
682         if (*cur_len > buffer_size)
683                 return -ENOMEM;
684
685         *cur_len += input_print_bitmap(buffer + *cur_len,
686                                         max(buffer_size - *cur_len, 0),
687                                         bitmap, max) + 1;
688         if (*cur_len > buffer_size)
689                 return -ENOMEM;
690
691         (*cur_index)++;
692         return 0;
693 }
694
695 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
696         do {                                                            \
697                 int err = add_uevent_var(envp, num_envp, &i,    \
698                                         buffer, buffer_size, &len,      \
699                                         fmt, val);                      \
700                 if (err)                                                \
701                         return err;                                     \
702         } while (0)
703
704 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
705         do {                                                            \
706                 int err = input_add_uevent_bm_var(envp, num_envp, &i,   \
707                                         buffer, buffer_size, &len,      \
708                                         name, bm, max);                 \
709                 if (err)                                                \
710                         return err;                                     \
711         } while (0)
712
713 static int input_dev_uevent(struct class_device *cdev, char **envp,
714                             int num_envp, char *buffer, int buffer_size)
715 {
716         struct input_dev *dev = to_input_dev(cdev);
717         int i = 0;
718         int len = 0;
719
720         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
721                                 dev->id.bustype, dev->id.vendor,
722                                 dev->id.product, dev->id.version);
723         if (dev->name)
724                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
725         if (dev->phys)
726                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
727         if (dev->uniq)
728                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
729
730         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
731         if (test_bit(EV_KEY, dev->evbit))
732                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
733         if (test_bit(EV_REL, dev->evbit))
734                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
735         if (test_bit(EV_ABS, dev->evbit))
736                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
737         if (test_bit(EV_MSC, dev->evbit))
738                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
739         if (test_bit(EV_LED, dev->evbit))
740                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
741         if (test_bit(EV_SND, dev->evbit))
742                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
743         if (test_bit(EV_FF, dev->evbit))
744                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
745         if (test_bit(EV_SW, dev->evbit))
746                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
747
748         envp[i++] = buffer + len;
749         len += snprintf(buffer + len, buffer_size - len, "MODALIAS=");
750         len += print_modalias(buffer + len, buffer_size - len, dev) + 1;
751
752         envp[i] = NULL;
753         return 0;
754 }
755
756 struct class input_class = {
757         .name                   = "input",
758         .release                = input_dev_release,
759         .uevent                 = input_dev_uevent,
760 };
761
762 struct input_dev *input_allocate_device(void)
763 {
764         struct input_dev *dev;
765
766         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
767         if (dev) {
768                 dev->dynalloc = 1;
769                 dev->cdev.class = &input_class;
770                 class_device_initialize(&dev->cdev);
771                 INIT_LIST_HEAD(&dev->h_list);
772                 INIT_LIST_HEAD(&dev->node);
773         }
774
775         return dev;
776 }
777
778 int input_register_device(struct input_dev *dev)
779 {
780         static atomic_t input_no = ATOMIC_INIT(0);
781         struct input_handle *handle;
782         struct input_handler *handler;
783         struct input_device_id *id;
784         const char *path;
785         int error;
786
787         if (!dev->dynalloc) {
788                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
789                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
790                         dev->name ? dev->name : "<Unknown>");
791                 return -EINVAL;
792         }
793
794         mutex_init(&dev->mutex);
795         set_bit(EV_SYN, dev->evbit);
796
797         /*
798          * If delay and period are pre-set by the driver, then autorepeating
799          * is handled by the driver itself and we don't do it in input.c.
800          */
801
802         init_timer(&dev->timer);
803         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
804                 dev->timer.data = (long) dev;
805                 dev->timer.function = input_repeat_key;
806                 dev->rep[REP_DELAY] = 250;
807                 dev->rep[REP_PERIOD] = 33;
808         }
809
810         INIT_LIST_HEAD(&dev->h_list);
811         list_add_tail(&dev->node, &input_dev_list);
812
813         dev->cdev.class = &input_class;
814         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
815                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
816
817         error = class_device_add(&dev->cdev);
818         if (error)
819                 return error;
820
821         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
822         if (error)
823                 goto fail1;
824
825         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
826         if (error)
827                 goto fail2;
828
829         error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
830         if (error)
831                 goto fail3;
832
833         __module_get(THIS_MODULE);
834
835         path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
836         printk(KERN_INFO "input: %s as %s\n",
837                 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
838         kfree(path);
839
840         list_for_each_entry(handler, &input_handler_list, node)
841                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
842                         if ((id = input_match_device(handler->id_table, dev)))
843                                 if ((handle = handler->connect(handler, dev, id)))
844                                         input_link_handle(handle);
845
846         input_wakeup_procfs_readers();
847
848         return 0;
849
850  fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
851  fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
852  fail1: class_device_del(&dev->cdev);
853         return error;
854 }
855
856 void input_unregister_device(struct input_dev *dev)
857 {
858         struct list_head * node, * next;
859
860         if (!dev) return;
861
862         del_timer_sync(&dev->timer);
863
864         list_for_each_safe(node, next, &dev->h_list) {
865                 struct input_handle * handle = to_handle(node);
866                 list_del_init(&handle->d_node);
867                 list_del_init(&handle->h_node);
868                 handle->handler->disconnect(handle);
869         }
870
871         list_del_init(&dev->node);
872
873         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
874         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
875         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
876         class_device_unregister(&dev->cdev);
877
878         input_wakeup_procfs_readers();
879 }
880
881 void input_register_handler(struct input_handler *handler)
882 {
883         struct input_dev *dev;
884         struct input_handle *handle;
885         struct input_device_id *id;
886
887         if (!handler) return;
888
889         INIT_LIST_HEAD(&handler->h_list);
890
891         if (handler->fops != NULL)
892                 input_table[handler->minor >> 5] = handler;
893
894         list_add_tail(&handler->node, &input_handler_list);
895
896         list_for_each_entry(dev, &input_dev_list, node)
897                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
898                         if ((id = input_match_device(handler->id_table, dev)))
899                                 if ((handle = handler->connect(handler, dev, id)))
900                                         input_link_handle(handle);
901
902         input_wakeup_procfs_readers();
903 }
904
905 void input_unregister_handler(struct input_handler *handler)
906 {
907         struct list_head * node, * next;
908
909         list_for_each_safe(node, next, &handler->h_list) {
910                 struct input_handle * handle = to_handle_h(node);
911                 list_del_init(&handle->h_node);
912                 list_del_init(&handle->d_node);
913                 handler->disconnect(handle);
914         }
915
916         list_del_init(&handler->node);
917
918         if (handler->fops != NULL)
919                 input_table[handler->minor >> 5] = NULL;
920
921         input_wakeup_procfs_readers();
922 }
923
924 static int input_open_file(struct inode *inode, struct file *file)
925 {
926         struct input_handler *handler = input_table[iminor(inode) >> 5];
927         const struct file_operations *old_fops, *new_fops = NULL;
928         int err;
929
930         /* No load-on-demand here? */
931         if (!handler || !(new_fops = fops_get(handler->fops)))
932                 return -ENODEV;
933
934         /*
935          * That's _really_ odd. Usually NULL ->open means "nothing special",
936          * not "no device". Oh, well...
937          */
938         if (!new_fops->open) {
939                 fops_put(new_fops);
940                 return -ENODEV;
941         }
942         old_fops = file->f_op;
943         file->f_op = new_fops;
944
945         err = new_fops->open(inode, file);
946
947         if (err) {
948                 fops_put(file->f_op);
949                 file->f_op = fops_get(old_fops);
950         }
951         fops_put(old_fops);
952         return err;
953 }
954
955 static struct file_operations input_fops = {
956         .owner = THIS_MODULE,
957         .open = input_open_file,
958 };
959
960 static int __init input_init(void)
961 {
962         int err;
963
964         err = class_register(&input_class);
965         if (err) {
966                 printk(KERN_ERR "input: unable to register input_dev class\n");
967                 return err;
968         }
969
970         err = input_proc_init();
971         if (err)
972                 goto fail1;
973
974         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
975         if (err) {
976                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
977                 goto fail2;
978         }
979
980         return 0;
981
982  fail2: input_proc_exit();
983  fail1: class_unregister(&input_class);
984         return err;
985 }
986
987 static void __exit input_exit(void)
988 {
989         input_proc_exit();
990         unregister_chrdev(INPUT_MAJOR, "input");
991         class_unregister(&input_class);
992 }
993
994 subsys_initcall(input_init);
995 module_exit(input_exit);