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ACPI: Allow overriding to higher critical trip point.
[linux-2.6/mini2440.git] / drivers / input / evdev.c
blob3524bef62be654910ec23ca5c917787269a6b018
1 /*
2 * Event char devices, giving access to raw input device events.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 */
10
11 #define EVDEV_MINOR_BASE 64
12 #define EVDEV_MINORS 32
13 #define EVDEV_BUFFER_SIZE 64
14
15 #include <linux/poll.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/input.h>
20 #include <linux/major.h>
21 #include <linux/device.h>
22 #include <linux/compat.h>
23
24 struct evdev {
25 int exist;
26 int open;
27 int minor;
28 char name[16];
29 struct input_handle handle;
30 wait_queue_head_t wait;
31 struct evdev_client *grab;
32 struct list_head client_list;
33 spinlock_t client_lock; /* protects client_list */
34 struct mutex mutex;
35 struct device dev;
36 };
37
38 struct evdev_client {
39 struct input_event buffer[EVDEV_BUFFER_SIZE];
40 int head;
41 int tail;
42 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
43 struct fasync_struct *fasync;
44 struct evdev *evdev;
45 struct list_head node;
46 };
47
48 static struct evdev *evdev_table[EVDEV_MINORS];
49 static DEFINE_MUTEX(evdev_table_mutex);
50
51 static void evdev_pass_event(struct evdev_client *client,
52 struct input_event *event)
53 {
54 /*
55 * Interrupts are disabled, just acquire the lock
56 */
57 spin_lock(&client->buffer_lock);
58 client->buffer[client->head++] = *event;
59 client->head &= EVDEV_BUFFER_SIZE - 1;
60 spin_unlock(&client->buffer_lock);
61
62 kill_fasync(&client->fasync, SIGIO, POLL_IN);
63 }
64
65 /*
66 * Pass incoming event to all connected clients.
67 */
68 static void evdev_event(struct input_handle *handle,
69 unsigned int type, unsigned int code, int value)
70 {
71 struct evdev *evdev = handle->private;
72 struct evdev_client *client;
73 struct input_event event;
74
75 do_gettimeofday(&event.time);
76 event.type = type;
77 event.code = code;
78 event.value = value;
79
80 rcu_read_lock();
81
82 client = rcu_dereference(evdev->grab);
83 if (client)
84 evdev_pass_event(client, &event);
85 else
86 list_for_each_entry_rcu(client, &evdev->client_list, node)
87 evdev_pass_event(client, &event);
88
89 rcu_read_unlock();
90
91 wake_up_interruptible(&evdev->wait);
92 }
93
94 static int evdev_fasync(int fd, struct file *file, int on)
95 {
96 struct evdev_client *client = file->private_data;
97 int retval;
98
99 retval = fasync_helper(fd, file, on, &client->fasync);
100
101 return retval < 0 ? retval : 0;
102 }
103
104 static int evdev_flush(struct file *file, fl_owner_t id)
105 {
106 struct evdev_client *client = file->private_data;
107 struct evdev *evdev = client->evdev;
108 int retval;
109
110 retval = mutex_lock_interruptible(&evdev->mutex);
111 if (retval)
112 return retval;
113
114 if (!evdev->exist)
115 retval = -ENODEV;
116 else
117 retval = input_flush_device(&evdev->handle, file);
118
119 mutex_unlock(&evdev->mutex);
120 return retval;
121 }
122
123 static void evdev_free(struct device *dev)
124 {
125 struct evdev *evdev = container_of(dev, struct evdev, dev);
126
127 input_put_device(evdev->handle.dev);
128 kfree(evdev);
129 }
130
131 /*
132 * Grabs an event device (along with underlying input device).
133 * This function is called with evdev->mutex taken.
134 */
135 static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
136 {
137 int error;
138
139 if (evdev->grab)
140 return -EBUSY;
141
142 error = input_grab_device(&evdev->handle);
143 if (error)
144 return error;
145
146 rcu_assign_pointer(evdev->grab, client);
147 synchronize_rcu();
148
149 return 0;
150 }
151
152 static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
153 {
154 if (evdev->grab != client)
155 return -EINVAL;
156
157 rcu_assign_pointer(evdev->grab, NULL);
158 synchronize_rcu();
159 input_release_device(&evdev->handle);
160
161 return 0;
162 }
163
164 static void evdev_attach_client(struct evdev *evdev,
165 struct evdev_client *client)
166 {
167 spin_lock(&evdev->client_lock);
168 list_add_tail_rcu(&client->node, &evdev->client_list);
169 spin_unlock(&evdev->client_lock);
170 synchronize_rcu();
171 }
172
173 static void evdev_detach_client(struct evdev *evdev,
174 struct evdev_client *client)
175 {
176 spin_lock(&evdev->client_lock);
177 list_del_rcu(&client->node);
178 spin_unlock(&evdev->client_lock);
179 synchronize_rcu();
180 }
181
182 static int evdev_open_device(struct evdev *evdev)
183 {
184 int retval;
185
186 retval = mutex_lock_interruptible(&evdev->mutex);
187 if (retval)
188 return retval;
189
190 if (!evdev->exist)
191 retval = -ENODEV;
192 else if (!evdev->open++) {
193 retval = input_open_device(&evdev->handle);
194 if (retval)
195 evdev->open--;
196 }
197
198 mutex_unlock(&evdev->mutex);
199 return retval;
200 }
201
202 static void evdev_close_device(struct evdev *evdev)
203 {
204 mutex_lock(&evdev->mutex);
205
206 if (evdev->exist && !--evdev->open)
207 input_close_device(&evdev->handle);
208
209 mutex_unlock(&evdev->mutex);
210 }
211
212 /*
213 * Wake up users waiting for IO so they can disconnect from
214 * dead device.
215 */
216 static void evdev_hangup(struct evdev *evdev)
217 {
218 struct evdev_client *client;
219
220 spin_lock(&evdev->client_lock);
221 list_for_each_entry(client, &evdev->client_list, node)
222 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
223 spin_unlock(&evdev->client_lock);
224
225 wake_up_interruptible(&evdev->wait);
226 }
227
228 static int evdev_release(struct inode *inode, struct file *file)
229 {
230 struct evdev_client *client = file->private_data;
231 struct evdev *evdev = client->evdev;
232
233 mutex_lock(&evdev->mutex);
234 if (evdev->grab == client)
235 evdev_ungrab(evdev, client);
236 mutex_unlock(&evdev->mutex);
237
238 evdev_fasync(-1, file, 0);
239 evdev_detach_client(evdev, client);
240 kfree(client);
241
242 evdev_close_device(evdev);
243 put_device(&evdev->dev);
244
245 return 0;
246 }
247
248 static int evdev_open(struct inode *inode, struct file *file)
249 {
250 struct evdev *evdev;
251 struct evdev_client *client;
252 int i = iminor(inode) - EVDEV_MINOR_BASE;
253 int error;
254
255 if (i >= EVDEV_MINORS)
256 return -ENODEV;
257
258 error = mutex_lock_interruptible(&evdev_table_mutex);
259 if (error)
260 return error;
261 evdev = evdev_table[i];
262 if (evdev)
263 get_device(&evdev->dev);
264 mutex_unlock(&evdev_table_mutex);
265
266 if (!evdev)
267 return -ENODEV;
268
269 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
270 if (!client) {
271 error = -ENOMEM;
272 goto err_put_evdev;
273 }
274
275 spin_lock_init(&client->buffer_lock);
276 client->evdev = evdev;
277 evdev_attach_client(evdev, client);
278
279 error = evdev_open_device(evdev);
280 if (error)
281 goto err_free_client;
282
283 file->private_data = client;
284 return 0;
285
286 err_free_client:
287 evdev_detach_client(evdev, client);
288 kfree(client);
289 err_put_evdev:
290 put_device(&evdev->dev);
291 return error;
292 }
293
294 #ifdef CONFIG_COMPAT
295
296 struct input_event_compat {
297 struct compat_timeval time;
298 __u16 type;
299 __u16 code;
300 __s32 value;
301 };
302
303 struct ff_periodic_effect_compat {
304 __u16 waveform;
305 __u16 period;
306 __s16 magnitude;
307 __s16 offset;
308 __u16 phase;
309
310 struct ff_envelope envelope;
311
312 __u32 custom_len;
313 compat_uptr_t custom_data;
314 };
315
316 struct ff_effect_compat {
317 __u16 type;
318 __s16 id;
319 __u16 direction;
320 struct ff_trigger trigger;
321 struct ff_replay replay;
322
323 union {
324 struct ff_constant_effect constant;
325 struct ff_ramp_effect ramp;
326 struct ff_periodic_effect_compat periodic;
327 struct ff_condition_effect condition[2]; /* One for each axis */
328 struct ff_rumble_effect rumble;
329 } u;
330 };
331
332 /* Note to the author of this code: did it ever occur to
333 you why the ifdefs are needed? Think about it again. -AK */
334 #ifdef CONFIG_X86_64
335 # define COMPAT_TEST is_compat_task()
336 #elif defined(CONFIG_IA64)
337 # define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current))
338 #elif defined(CONFIG_S390)
339 # define COMPAT_TEST test_thread_flag(TIF_31BIT)
340 #elif defined(CONFIG_MIPS)
341 # define COMPAT_TEST test_thread_flag(TIF_32BIT_ADDR)
342 #else
343 # define COMPAT_TEST test_thread_flag(TIF_32BIT)
344 #endif
345
346 static inline size_t evdev_event_size(void)
347 {
348 return COMPAT_TEST ?
349 sizeof(struct input_event_compat) : sizeof(struct input_event);
350 }
351
352 static int evdev_event_from_user(const char __user *buffer,
353 struct input_event *event)
354 {
355 if (COMPAT_TEST) {
356 struct input_event_compat compat_event;
357
358 if (copy_from_user(&compat_event, buffer,
359 sizeof(struct input_event_compat)))
360 return -EFAULT;
361
362 event->time.tv_sec = compat_event.time.tv_sec;
363 event->time.tv_usec = compat_event.time.tv_usec;
364 event->type = compat_event.type;
365 event->code = compat_event.code;
366 event->value = compat_event.value;
367
368 } else {
369 if (copy_from_user(event, buffer, sizeof(struct input_event)))
370 return -EFAULT;
371 }
372
373 return 0;
374 }
375
376 static int evdev_event_to_user(char __user *buffer,
377 const struct input_event *event)
378 {
379 if (COMPAT_TEST) {
380 struct input_event_compat compat_event;
381
382 compat_event.time.tv_sec = event->time.tv_sec;
383 compat_event.time.tv_usec = event->time.tv_usec;
384 compat_event.type = event->type;
385 compat_event.code = event->code;
386 compat_event.value = event->value;
387
388 if (copy_to_user(buffer, &compat_event,
389 sizeof(struct input_event_compat)))
390 return -EFAULT;
391
392 } else {
393 if (copy_to_user(buffer, event, sizeof(struct input_event)))
394 return -EFAULT;
395 }
396
397 return 0;
398 }
399
400 static int evdev_ff_effect_from_user(const char __user *buffer, size_t size,
401 struct ff_effect *effect)
402 {
403 if (COMPAT_TEST) {
404 struct ff_effect_compat *compat_effect;
405
406 if (size != sizeof(struct ff_effect_compat))
407 return -EINVAL;
408
409 /*
410 * It so happens that the pointer which needs to be changed
411 * is the last field in the structure, so we can copy the
412 * whole thing and replace just the pointer.
413 */
414
415 compat_effect = (struct ff_effect_compat *)effect;
416
417 if (copy_from_user(compat_effect, buffer,
418 sizeof(struct ff_effect_compat)))
419 return -EFAULT;
420
421 if (compat_effect->type == FF_PERIODIC &&
422 compat_effect->u.periodic.waveform == FF_CUSTOM)
423 effect->u.periodic.custom_data =
424 compat_ptr(compat_effect->u.periodic.custom_data);
425 } else {
426 if (size != sizeof(struct ff_effect))
427 return -EINVAL;
428
429 if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
430 return -EFAULT;
431 }
432
433 return 0;
434 }
435
436 #else
437
438 static inline size_t evdev_event_size(void)
439 {
440 return sizeof(struct input_event);
441 }
442
443 static int evdev_event_from_user(const char __user *buffer,
444 struct input_event *event)
445 {
446 if (copy_from_user(event, buffer, sizeof(struct input_event)))
447 return -EFAULT;
448
449 return 0;
450 }
451
452 static int evdev_event_to_user(char __user *buffer,
453 const struct input_event *event)
454 {
455 if (copy_to_user(buffer, event, sizeof(struct input_event)))
456 return -EFAULT;
457
458 return 0;
459 }
460
461 static int evdev_ff_effect_from_user(const char __user *buffer, size_t size,
462 struct ff_effect *effect)
463 {
464 if (size != sizeof(struct ff_effect))
465 return -EINVAL;
466
467 if (copy_from_user(effect, buffer, sizeof(struct ff_effect)))
468 return -EFAULT;
469
470 return 0;
471 }
472
473 #endif /* CONFIG_COMPAT */
474
475 static ssize_t evdev_write(struct file *file, const char __user *buffer,
476 size_t count, loff_t *ppos)
477 {
478 struct evdev_client *client = file->private_data;
479 struct evdev *evdev = client->evdev;
480 struct input_event event;
481 int retval;
482
483 retval = mutex_lock_interruptible(&evdev->mutex);
484 if (retval)
485 return retval;
486
487 if (!evdev->exist) {
488 retval = -ENODEV;
489 goto out;
490 }
491
492 while (retval < count) {
493
494 if (evdev_event_from_user(buffer + retval, &event)) {
495 retval = -EFAULT;
496 goto out;
497 }
498
499 input_inject_event(&evdev->handle,
500 event.type, event.code, event.value);
501 retval += evdev_event_size();
502 }
503
504 out:
505 mutex_unlock(&evdev->mutex);
506 return retval;
507 }
508
509 static int evdev_fetch_next_event(struct evdev_client *client,
510 struct input_event *event)
511 {
512 int have_event;
513
514 spin_lock_irq(&client->buffer_lock);
515
516 have_event = client->head != client->tail;
517 if (have_event) {
518 *event = client->buffer[client->tail++];
519 client->tail &= EVDEV_BUFFER_SIZE - 1;
520 }
521
522 spin_unlock_irq(&client->buffer_lock);
523
524 return have_event;
525 }
526
527 static ssize_t evdev_read(struct file *file, char __user *buffer,
528 size_t count, loff_t *ppos)
529 {
530 struct evdev_client *client = file->private_data;
531 struct evdev *evdev = client->evdev;
532 struct input_event event;
533 int retval;
534
535 if (count < evdev_event_size())
536 return -EINVAL;
537
538 if (client->head == client->tail && evdev->exist &&
539 (file->f_flags & O_NONBLOCK))
540 return -EAGAIN;
541
542 retval = wait_event_interruptible(evdev->wait,
543 client->head != client->tail || !evdev->exist);
544 if (retval)
545 return retval;
546
547 if (!evdev->exist)
548 return -ENODEV;
549
550 while (retval + evdev_event_size() <= count &&
551 evdev_fetch_next_event(client, &event)) {
552
553 if (evdev_event_to_user(buffer + retval, &event))
554 return -EFAULT;
555
556 retval += evdev_event_size();
557 }
558
559 return retval;
560 }
561
562 /* No kernel lock - fine */
563 static unsigned int evdev_poll(struct file *file, poll_table *wait)
564 {
565 struct evdev_client *client = file->private_data;
566 struct evdev *evdev = client->evdev;
567
568 poll_wait(file, &evdev->wait, wait);
569 return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
570 (evdev->exist ? 0 : (POLLHUP | POLLERR));
571 }
572
573 #ifdef CONFIG_COMPAT
574
575 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
576 #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
577
578 #ifdef __BIG_ENDIAN
579 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
580 unsigned int maxlen, void __user *p, int compat)
581 {
582 int len, i;
583
584 if (compat) {
585 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
586 if (len > maxlen)
587 len = maxlen;
588
589 for (i = 0; i < len / sizeof(compat_long_t); i++)
590 if (copy_to_user((compat_long_t __user *) p + i,
591 (compat_long_t *) bits +
592 i + 1 - ((i % 2) << 1),
593 sizeof(compat_long_t)))
594 return -EFAULT;
595 } else {
596 len = BITS_TO_LONGS(maxbit) * sizeof(long);
597 if (len > maxlen)
598 len = maxlen;
599
600 if (copy_to_user(p, bits, len))
601 return -EFAULT;
602 }
603
604 return len;
605 }
606 #else
607 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
608 unsigned int maxlen, void __user *p, int compat)
609 {
610 int len = compat ?
611 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
612 BITS_TO_LONGS(maxbit) * sizeof(long);
613
614 if (len > maxlen)
615 len = maxlen;
616
617 return copy_to_user(p, bits, len) ? -EFAULT : len;
618 }
619 #endif /* __BIG_ENDIAN */
620
621 #else
622
623 static int bits_to_user(unsigned long *bits, unsigned int maxbit,
624 unsigned int maxlen, void __user *p, int compat)
625 {
626 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
627
628 if (len > maxlen)
629 len = maxlen;
630
631 return copy_to_user(p, bits, len) ? -EFAULT : len;
632 }
633
634 #endif /* CONFIG_COMPAT */
635
636 static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
637 {
638 int len;
639
640 if (!str)
641 return -ENOENT;
642
643 len = strlen(str) + 1;
644 if (len > maxlen)
645 len = maxlen;
646
647 return copy_to_user(p, str, len) ? -EFAULT : len;
648 }
649
650 #define OLD_KEY_MAX 0x1ff
651 static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode)
652 {
653 static unsigned long keymax_warn_time;
654 unsigned long *bits;
655 int len;
656
657 switch (_IOC_NR(cmd) & EV_MAX) {
658
659 case 0: bits = dev->evbit; len = EV_MAX; break;
660 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
661 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
662 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
663 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
664 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
665 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
666 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
667 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
668 default: return -EINVAL;
669 }
670
671 /*
672 * Work around bugs in userspace programs that like to do
673 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
674 * should be in bytes, not in bits.
675 */
676 if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) {
677 len = OLD_KEY_MAX;
678 if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
679 printk(KERN_WARNING
680 "evdev.c(EVIOCGBIT): Suspicious buffer size %u, "
681 "limiting output to %zu bytes. See "
682 "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
683 OLD_KEY_MAX,
684 BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
685 }
686
687 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
688 }
689 #undef OLD_KEY_MAX
690
691 static long evdev_do_ioctl(struct file *file, unsigned int cmd,
692 void __user *p, int compat_mode)
693 {
694 struct evdev_client *client = file->private_data;
695 struct evdev *evdev = client->evdev;
696 struct input_dev *dev = evdev->handle.dev;
697 struct input_absinfo abs;
698 struct ff_effect effect;
699 int __user *ip = (int __user *)p;
700 int i, t, u, v;
701 int error;
702
703 switch (cmd) {
704
705 case EVIOCGVERSION:
706 return put_user(EV_VERSION, ip);
707
708 case EVIOCGID:
709 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
710 return -EFAULT;
711 return 0;
712
713 case EVIOCGREP:
714 if (!test_bit(EV_REP, dev->evbit))
715 return -ENOSYS;
716 if (put_user(dev->rep[REP_DELAY], ip))
717 return -EFAULT;
718 if (put_user(dev->rep[REP_PERIOD], ip + 1))
719 return -EFAULT;
720 return 0;
721
722 case EVIOCSREP:
723 if (!test_bit(EV_REP, dev->evbit))
724 return -ENOSYS;
725 if (get_user(u, ip))
726 return -EFAULT;
727 if (get_user(v, ip + 1))
728 return -EFAULT;
729
730 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
731 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
732
733 return 0;
734
735 case EVIOCGKEYCODE:
736 if (get_user(t, ip))
737 return -EFAULT;
738
739 error = input_get_keycode(dev, t, &v);
740 if (error)
741 return error;
742
743 if (put_user(v, ip + 1))
744 return -EFAULT;
745
746 return 0;
747
748 case EVIOCSKEYCODE:
749 if (get_user(t, ip) || get_user(v, ip + 1))
750 return -EFAULT;
751
752 return input_set_keycode(dev, t, v);
753
754 case EVIOCRMFF:
755 return input_ff_erase(dev, (int)(unsigned long) p, file);
756
757 case EVIOCGEFFECTS:
758 i = test_bit(EV_FF, dev->evbit) ?
759 dev->ff->max_effects : 0;
760 if (put_user(i, ip))
761 return -EFAULT;
762 return 0;
763
764 case EVIOCGRAB:
765 if (p)
766 return evdev_grab(evdev, client);
767 else
768 return evdev_ungrab(evdev, client);
769
770 default:
771
772 if (_IOC_TYPE(cmd) != 'E')
773 return -EINVAL;
774
775 if (_IOC_DIR(cmd) == _IOC_READ) {
776
777 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
778 return handle_eviocgbit(dev, cmd, p, compat_mode);
779
780 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
781 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
782 p, compat_mode);
783
784 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
785 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
786 p, compat_mode);
787
788 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
789 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
790 p, compat_mode);
791
792 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
793 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
794 p, compat_mode);
795
796 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
797 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
798
799 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
800 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
801
802 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
803 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
804
805 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
806
807 t = _IOC_NR(cmd) & ABS_MAX;
808
809 abs.value = dev->abs[t];
810 abs.minimum = dev->absmin[t];
811 abs.maximum = dev->absmax[t];
812 abs.fuzz = dev->absfuzz[t];
813 abs.flat = dev->absflat[t];
814
815 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
816 return -EFAULT;
817
818 return 0;
819 }
820
821 }
822
823 if (_IOC_DIR(cmd) == _IOC_WRITE) {
824
825 if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
826
827 if (evdev_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
828 return -EFAULT;
829
830 error = input_ff_upload(dev, &effect, file);
831
832 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
833 return -EFAULT;
834
835 return error;
836 }
837
838 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
839
840 t = _IOC_NR(cmd) & ABS_MAX;
841
842 if (copy_from_user(&abs, p,
843 sizeof(struct input_absinfo)))
844 return -EFAULT;
845
846 /*
847 * Take event lock to ensure that we are not
848 * changing device parameters in the middle
849 * of event.
850 */
851 spin_lock_irq(&dev->event_lock);
852
853 dev->abs[t] = abs.value;
854 dev->absmin[t] = abs.minimum;
855 dev->absmax[t] = abs.maximum;
856 dev->absfuzz[t] = abs.fuzz;
857 dev->absflat[t] = abs.flat;
858
859 spin_unlock_irq(&dev->event_lock);
860
861 return 0;
862 }
863 }
864 }
865 return -EINVAL;
866 }
867
868 static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
869 void __user *p, int compat_mode)
870 {
871 struct evdev_client *client = file->private_data;
872 struct evdev *evdev = client->evdev;
873 int retval;
874
875 retval = mutex_lock_interruptible(&evdev->mutex);
876 if (retval)
877 return retval;
878
879 if (!evdev->exist) {
880 retval = -ENODEV;
881 goto out;
882 }
883
884 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
885
886 out:
887 mutex_unlock(&evdev->mutex);
888 return retval;
889 }
890
891 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
892 {
893 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
894 }
895
896 #ifdef CONFIG_COMPAT
897 static long evdev_ioctl_compat(struct file *file,
898 unsigned int cmd, unsigned long arg)
899 {
900 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
901 }
902 #endif
903
904 static const struct file_operations evdev_fops = {
905 .owner = THIS_MODULE,
906 .read = evdev_read,
907 .write = evdev_write,
908 .poll = evdev_poll,
909 .open = evdev_open,
910 .release = evdev_release,
911 .unlocked_ioctl = evdev_ioctl,
912 #ifdef CONFIG_COMPAT
913 .compat_ioctl = evdev_ioctl_compat,
914 #endif
915 .fasync = evdev_fasync,
916 .flush = evdev_flush
917 };
918
919 static int evdev_install_chrdev(struct evdev *evdev)
920 {
921 /*
922 * No need to do any locking here as calls to connect and
923 * disconnect are serialized by the input core
924 */
925 evdev_table[evdev->minor] = evdev;
926 return 0;
927 }
928
929 static void evdev_remove_chrdev(struct evdev *evdev)
930 {
931 /*
932 * Lock evdev table to prevent race with evdev_open()
933 */
934 mutex_lock(&evdev_table_mutex);
935 evdev_table[evdev->minor] = NULL;
936 mutex_unlock(&evdev_table_mutex);
937 }
938
939 /*
940 * Mark device non-existent. This disables writes, ioctls and
941 * prevents new users from opening the device. Already posted
942 * blocking reads will stay, however new ones will fail.
943 */
944 static void evdev_mark_dead(struct evdev *evdev)
945 {
946 mutex_lock(&evdev->mutex);
947 evdev->exist = 0;
948 mutex_unlock(&evdev->mutex);
949 }
950
951 static void evdev_cleanup(struct evdev *evdev)
952 {
953 struct input_handle *handle = &evdev->handle;
954
955 evdev_mark_dead(evdev);
956 evdev_hangup(evdev);
957 evdev_remove_chrdev(evdev);
958
959 /* evdev is marked dead so no one else accesses evdev->open */
960 if (evdev->open) {
961 input_flush_device(handle, NULL);
962 input_close_device(handle);
963 }
964 }
965
966 /*
967 * Create new evdev device. Note that input core serializes calls
968 * to connect and disconnect so we don't need to lock evdev_table here.
969 */
970 static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
971 const struct input_device_id *id)
972 {
973 struct evdev *evdev;
974 int minor;
975 int error;
976
977 for (minor = 0; minor < EVDEV_MINORS; minor++)
978 if (!evdev_table[minor])
979 break;
980
981 if (minor == EVDEV_MINORS) {
982 printk(KERN_ERR "evdev: no more free evdev devices\n");
983 return -ENFILE;
984 }
985
986 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
987 if (!evdev)
988 return -ENOMEM;
989
990 INIT_LIST_HEAD(&evdev->client_list);
991 spin_lock_init(&evdev->client_lock);
992 mutex_init(&evdev->mutex);
993 init_waitqueue_head(&evdev->wait);
994
995 snprintf(evdev->name, sizeof(evdev->name), "event%d", minor);
996 evdev->exist = 1;
997 evdev->minor = minor;
998
999 evdev->handle.dev = input_get_device(dev);
1000 evdev->handle.name = evdev->name;
1001 evdev->handle.handler = handler;
1002 evdev->handle.private = evdev;
1003
1004 strlcpy(evdev->dev.bus_id, evdev->name, sizeof(evdev->dev.bus_id));
1005 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
1006 evdev->dev.class = &input_class;
1007 evdev->dev.parent = &dev->dev;
1008 evdev->dev.release = evdev_free;
1009 device_initialize(&evdev->dev);
1010
1011 error = input_register_handle(&evdev->handle);
1012 if (error)
1013 goto err_free_evdev;
1014
1015 error = evdev_install_chrdev(evdev);
1016 if (error)
1017 goto err_unregister_handle;
1018
1019 error = device_add(&evdev->dev);
1020 if (error)
1021 goto err_cleanup_evdev;
1022
1023 return 0;
1024
1025 err_cleanup_evdev:
1026 evdev_cleanup(evdev);
1027 err_unregister_handle:
1028 input_unregister_handle(&evdev->handle);
1029 err_free_evdev:
1030 put_device(&evdev->dev);
1031 return error;
1032 }
1033
1034 static void evdev_disconnect(struct input_handle *handle)
1035 {
1036 struct evdev *evdev = handle->private;
1037
1038 device_del(&evdev->dev);
1039 evdev_cleanup(evdev);
1040 input_unregister_handle(handle);
1041 put_device(&evdev->dev);
1042 }
1043
1044 static const struct input_device_id evdev_ids[] = {
1045 { .driver_info = 1 }, /* Matches all devices */
1046 { }, /* Terminating zero entry */
1047 };
1048
1049 MODULE_DEVICE_TABLE(input, evdev_ids);
1050
1051 static struct input_handler evdev_handler = {
1052 .event = evdev_event,
1053 .connect = evdev_connect,
1054 .disconnect = evdev_disconnect,
1055 .fops = &evdev_fops,
1056 .minor = EVDEV_MINOR_BASE,
1057 .name = "evdev",
1058 .id_table = evdev_ids,
1059 };
1060
1061 static int __init evdev_init(void)
1062 {
1063 return input_register_handler(&evdev_handler);
1064 }
1065
1066 static void __exit evdev_exit(void)
1067 {
1068 input_unregister_handler(&evdev_handler);
1069 }
1070
1071 module_init(evdev_init);
1072 module_exit(evdev_exit);
1073
1074 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
1075 MODULE_DESCRIPTION("Input driver event char devices");
1076 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards