[PATCH] Input: fix 'uniq' reporting in hotplug handler
[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/kobject_uevent.h>
22 #include <linux/interrupt.h>
23 #include <linux/poll.h>
24 #include <linux/device.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 = down_interruptible(&dev->sem);
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         up(&dev->sem);
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         down(&dev->sem);
260
261         if (!--dev->users && dev->close)
262                 dev->close(dev);
263         handle->open--;
264
265         up(&dev->sem);
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         entry->proc_fops = &input_fileops;
482         entry->proc_fops->poll = input_devices_poll;
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 = down_interruptible(&input_dev->sem);                           \
517         if (retval)                                                             \
518                 return retval;                                                  \
519                                                                                 \
520         retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : "");  \
521                                                                                 \
522         up(&input_dev->sem);                                                    \
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 struct attribute *input_dev_attrs[] = {
533         &class_device_attr_name.attr,
534         &class_device_attr_phys.attr,
535         &class_device_attr_uniq.attr,
536         NULL
537 };
538
539 static struct attribute_group input_dev_group = {
540         .attrs  = input_dev_attrs,
541 };
542
543 #define INPUT_DEV_ID_ATTR(name)                                                 \
544 static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf)    \
545 {                                                                               \
546         struct input_dev *input_dev = to_input_dev(dev);                        \
547         return sprintf(buf, "%04x\n", input_dev->id.name);                      \
548 }                                                                               \
549 static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
550
551 INPUT_DEV_ID_ATTR(bustype);
552 INPUT_DEV_ID_ATTR(vendor);
553 INPUT_DEV_ID_ATTR(product);
554 INPUT_DEV_ID_ATTR(version);
555
556 static struct attribute *input_dev_id_attrs[] = {
557         &class_device_attr_bustype.attr,
558         &class_device_attr_vendor.attr,
559         &class_device_attr_product.attr,
560         &class_device_attr_version.attr,
561         NULL
562 };
563
564 static struct attribute_group input_dev_id_attr_group = {
565         .name   = "id",
566         .attrs  = input_dev_id_attrs,
567 };
568
569 #define INPUT_DEV_CAP_ATTR(ev, bm)                                              \
570 static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf)     \
571 {                                                                               \
572         struct input_dev *input_dev = to_input_dev(dev);                        \
573         return input_print_bitmap(buf, PAGE_SIZE, input_dev->bm##bit, ev##_MAX);\
574 }                                                                               \
575 static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
576
577 INPUT_DEV_CAP_ATTR(EV, ev);
578 INPUT_DEV_CAP_ATTR(KEY, key);
579 INPUT_DEV_CAP_ATTR(REL, rel);
580 INPUT_DEV_CAP_ATTR(ABS, abs);
581 INPUT_DEV_CAP_ATTR(MSC, msc);
582 INPUT_DEV_CAP_ATTR(LED, led);
583 INPUT_DEV_CAP_ATTR(SND, snd);
584 INPUT_DEV_CAP_ATTR(FF, ff);
585 INPUT_DEV_CAP_ATTR(SW, sw);
586
587 static struct attribute *input_dev_caps_attrs[] = {
588         &class_device_attr_ev.attr,
589         &class_device_attr_key.attr,
590         &class_device_attr_rel.attr,
591         &class_device_attr_abs.attr,
592         &class_device_attr_msc.attr,
593         &class_device_attr_led.attr,
594         &class_device_attr_snd.attr,
595         &class_device_attr_ff.attr,
596         &class_device_attr_sw.attr,
597         NULL
598 };
599
600 static struct attribute_group input_dev_caps_attr_group = {
601         .name   = "capabilities",
602         .attrs  = input_dev_caps_attrs,
603 };
604
605 static void input_dev_release(struct class_device *class_dev)
606 {
607         struct input_dev *dev = to_input_dev(class_dev);
608
609         kfree(dev);
610         module_put(THIS_MODULE);
611 }
612
613 /*
614  * Input hotplugging interface - loading event handlers based on
615  * device bitfields.
616  */
617 static int input_add_hotplug_bm_var(char **envp, int num_envp, int *cur_index,
618                                     char *buffer, int buffer_size, int *cur_len,
619                                     const char *name, unsigned long *bitmap, int max)
620 {
621         if (*cur_index >= num_envp - 1)
622                 return -ENOMEM;
623
624         envp[*cur_index] = buffer + *cur_len;
625
626         *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
627         if (*cur_len > buffer_size)
628                 return -ENOMEM;
629
630         *cur_len += input_print_bitmap(buffer + *cur_len,
631                                         max(buffer_size - *cur_len, 0),
632                                         bitmap, max) + 1;
633         if (*cur_len > buffer_size)
634                 return -ENOMEM;
635
636         (*cur_index)++;
637         return 0;
638 }
639
640 #define INPUT_ADD_HOTPLUG_VAR(fmt, val...)                              \
641         do {                                                            \
642                 int err = add_hotplug_env_var(envp, num_envp, &i,       \
643                                         buffer, buffer_size, &len,      \
644                                         fmt, val);                      \
645                 if (err)                                                \
646                         return err;                                     \
647         } while (0)
648
649 #define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max)                         \
650         do {                                                            \
651                 int err = input_add_hotplug_bm_var(envp, num_envp, &i,  \
652                                         buffer, buffer_size, &len,      \
653                                         name, bm, max);                 \
654                 if (err)                                                \
655                         return err;                                     \
656         } while (0)
657
658 static int input_dev_hotplug(struct class_device *cdev, char **envp,
659                              int num_envp, char *buffer, int buffer_size)
660 {
661         struct input_dev *dev = to_input_dev(cdev);
662         int i = 0;
663         int len = 0;
664
665         INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
666                                 dev->id.bustype, dev->id.vendor,
667                                 dev->id.product, dev->id.version);
668         if (dev->name)
669                 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
670         if (dev->phys)
671                 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
672         if (dev->uniq)
673                 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
674
675         INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
676         if (test_bit(EV_KEY, dev->evbit))
677                 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
678         if (test_bit(EV_REL, dev->evbit))
679                 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
680         if (test_bit(EV_ABS, dev->evbit))
681                 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
682         if (test_bit(EV_MSC, dev->evbit))
683                 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
684         if (test_bit(EV_LED, dev->evbit))
685                 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
686         if (test_bit(EV_SND, dev->evbit))
687                 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
688         if (test_bit(EV_FF, dev->evbit))
689                 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
690         if (test_bit(EV_SW, dev->evbit))
691                 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
692
693         envp[i] = NULL;
694
695         return 0;
696 }
697
698 struct class input_class = {
699         .name                   = "input",
700         .release                = input_dev_release,
701         .hotplug                = input_dev_hotplug,
702 };
703
704 struct input_dev *input_allocate_device(void)
705 {
706         struct input_dev *dev;
707
708         dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
709         if (dev) {
710                 dev->dynalloc = 1;
711                 dev->cdev.class = &input_class;
712                 class_device_initialize(&dev->cdev);
713                 INIT_LIST_HEAD(&dev->h_list);
714                 INIT_LIST_HEAD(&dev->node);
715         }
716
717         return dev;
718 }
719
720 static void input_register_classdevice(struct input_dev *dev)
721 {
722         static atomic_t input_no = ATOMIC_INIT(0);
723         const char *path;
724
725         __module_get(THIS_MODULE);
726
727         dev->dev = dev->cdev.dev;
728
729         snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
730                  "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
731
732         path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL);
733         printk(KERN_INFO "input: %s as %s/%s\n",
734                 dev->name ? dev->name : "Unspecified device",
735                 path ? path : "", dev->cdev.class_id);
736         kfree(path);
737
738         class_device_add(&dev->cdev);
739         sysfs_create_group(&dev->cdev.kobj, &input_dev_group);
740         sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
741         sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
742 }
743
744 int input_register_device(struct input_dev *dev)
745 {
746         struct input_handle *handle;
747         struct input_handler *handler;
748         struct input_device_id *id;
749
750         if (!dev->dynalloc) {
751                 printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
752                         "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
753                         dev->name ? dev->name : "<Unknown>");
754                 return -EINVAL;
755         }
756
757         init_MUTEX(&dev->sem);
758         set_bit(EV_SYN, dev->evbit);
759
760         /*
761          * If delay and period are pre-set by the driver, then autorepeating
762          * is handled by the driver itself and we don't do it in input.c.
763          */
764
765         init_timer(&dev->timer);
766         if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
767                 dev->timer.data = (long) dev;
768                 dev->timer.function = input_repeat_key;
769                 dev->rep[REP_DELAY] = 250;
770                 dev->rep[REP_PERIOD] = 33;
771         }
772
773         INIT_LIST_HEAD(&dev->h_list);
774         list_add_tail(&dev->node, &input_dev_list);
775
776         input_register_classdevice(dev);
777
778         list_for_each_entry(handler, &input_handler_list, node)
779                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
780                         if ((id = input_match_device(handler->id_table, dev)))
781                                 if ((handle = handler->connect(handler, dev, id)))
782                                         input_link_handle(handle);
783
784         input_wakeup_procfs_readers();
785
786         return 0;
787 }
788
789 void input_unregister_device(struct input_dev *dev)
790 {
791         struct list_head * node, * next;
792
793         if (!dev) return;
794
795         del_timer_sync(&dev->timer);
796
797         list_for_each_safe(node, next, &dev->h_list) {
798                 struct input_handle * handle = to_handle(node);
799                 list_del_init(&handle->d_node);
800                 list_del_init(&handle->h_node);
801                 handle->handler->disconnect(handle);
802         }
803
804         list_del_init(&dev->node);
805
806         sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
807         sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
808         sysfs_remove_group(&dev->cdev.kobj, &input_dev_group);
809         class_device_unregister(&dev->cdev);
810
811         input_wakeup_procfs_readers();
812 }
813
814 void input_register_handler(struct input_handler *handler)
815 {
816         struct input_dev *dev;
817         struct input_handle *handle;
818         struct input_device_id *id;
819
820         if (!handler) return;
821
822         INIT_LIST_HEAD(&handler->h_list);
823
824         if (handler->fops != NULL)
825                 input_table[handler->minor >> 5] = handler;
826
827         list_add_tail(&handler->node, &input_handler_list);
828
829         list_for_each_entry(dev, &input_dev_list, node)
830                 if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
831                         if ((id = input_match_device(handler->id_table, dev)))
832                                 if ((handle = handler->connect(handler, dev, id)))
833                                         input_link_handle(handle);
834
835         input_wakeup_procfs_readers();
836 }
837
838 void input_unregister_handler(struct input_handler *handler)
839 {
840         struct list_head * node, * next;
841
842         list_for_each_safe(node, next, &handler->h_list) {
843                 struct input_handle * handle = to_handle_h(node);
844                 list_del_init(&handle->h_node);
845                 list_del_init(&handle->d_node);
846                 handler->disconnect(handle);
847         }
848
849         list_del_init(&handler->node);
850
851         if (handler->fops != NULL)
852                 input_table[handler->minor >> 5] = NULL;
853
854         input_wakeup_procfs_readers();
855 }
856
857 static int input_open_file(struct inode *inode, struct file *file)
858 {
859         struct input_handler *handler = input_table[iminor(inode) >> 5];
860         struct file_operations *old_fops, *new_fops = NULL;
861         int err;
862
863         /* No load-on-demand here? */
864         if (!handler || !(new_fops = fops_get(handler->fops)))
865                 return -ENODEV;
866
867         /*
868          * That's _really_ odd. Usually NULL ->open means "nothing special",
869          * not "no device". Oh, well...
870          */
871         if (!new_fops->open) {
872                 fops_put(new_fops);
873                 return -ENODEV;
874         }
875         old_fops = file->f_op;
876         file->f_op = new_fops;
877
878         err = new_fops->open(inode, file);
879
880         if (err) {
881                 fops_put(file->f_op);
882                 file->f_op = fops_get(old_fops);
883         }
884         fops_put(old_fops);
885         return err;
886 }
887
888 static struct file_operations input_fops = {
889         .owner = THIS_MODULE,
890         .open = input_open_file,
891 };
892
893 static int __init input_init(void)
894 {
895         int err;
896
897         err = class_register(&input_class);
898         if (err) {
899                 printk(KERN_ERR "input: unable to register input_dev class\n");
900                 return err;
901         }
902
903         err = input_proc_init();
904         if (err)
905                 goto fail1;
906
907         err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
908         if (err) {
909                 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
910                 goto fail2;
911         }
912
913         return 0;
914
915  fail2: input_proc_exit();
916  fail1: class_unregister(&input_class);
917         return err;
918 }
919
920 static void __exit input_exit(void)
921 {
922         input_proc_exit();
923         unregister_chrdev(INPUT_MAJOR, "input");
924         class_unregister(&input_class);
925 }
926
927 subsys_initcall(input_init);
928 module_exit(input_exit);