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CommitLineData
1da177e4
LT
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
63a6404d
HR
13#define EVDEV_MIN_BUFFER_SIZE 64U
14#define EVDEV_BUF_PACKETS 8
1da177e4
LT
15
16#include <linux/poll.h>
a99bbaf5 17#include <linux/sched.h>
1da177e4
LT
18#include <linux/slab.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/input.h>
22#include <linux/major.h>
1da177e4 23#include <linux/device.h>
2d56f3a3 24#include "input-compat.h"
1da177e4
LT
25
26struct evdev {
1da177e4
LT
27 int open;
28 int minor;
1da177e4
LT
29 struct input_handle handle;
30 wait_queue_head_t wait;
2be85279 31 struct evdev_client __rcu *grab;
d0ffb9be 32 struct list_head client_list;
6addb1d6
DT
33 spinlock_t client_lock; /* protects client_list */
34 struct mutex mutex;
9657d75c 35 struct device dev;
20da92de 36 bool exist;
1da177e4
LT
37};
38
d0ffb9be 39struct evdev_client {
1da177e4
LT
40 int head;
41 int tail;
6addb1d6 42 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
1da177e4
LT
43 struct fasync_struct *fasync;
44 struct evdev *evdev;
45 struct list_head node;
b58f7086
HR
46 int bufsize;
47 struct input_event buffer[];
1da177e4
LT
48};
49
50static struct evdev *evdev_table[EVDEV_MINORS];
6addb1d6 51static DEFINE_MUTEX(evdev_table_mutex);
1da177e4 52
6addb1d6
DT
53static void evdev_pass_event(struct evdev_client *client,
54 struct input_event *event)
55{
56 /*
e725a494
HR
57 * Interrupts are disabled, just acquire the lock.
58 * Make sure we don't leave with the client buffer
59 * "empty" by having client->head == client->tail.
6addb1d6
DT
60 */
61 spin_lock(&client->buffer_lock);
e725a494
HR
62 do {
63 client->buffer[client->head++] = *event;
64 client->head &= client->bufsize - 1;
65 } while (client->head == client->tail);
6addb1d6
DT
66 spin_unlock(&client->buffer_lock);
67
30a589fd
AJ
68 if (event->type == EV_SYN)
69 kill_fasync(&client->fasync, SIGIO, POLL_IN);
6addb1d6
DT
70}
71
72/*
82ba56c2 73 * Pass incoming event to all connected clients.
6addb1d6
DT
74 */
75static void evdev_event(struct input_handle *handle,
76 unsigned int type, unsigned int code, int value)
1da177e4
LT
77{
78 struct evdev *evdev = handle->private;
d0ffb9be 79 struct evdev_client *client;
6addb1d6 80 struct input_event event;
1da177e4 81
6addb1d6
DT
82 do_gettimeofday(&event.time);
83 event.type = type;
84 event.code = code;
85 event.value = value;
1da177e4 86
82ba56c2
DT
87 rcu_read_lock();
88
6addb1d6
DT
89 client = rcu_dereference(evdev->grab);
90 if (client)
91 evdev_pass_event(client, &event);
92 else
93 list_for_each_entry_rcu(client, &evdev->client_list, node)
94 evdev_pass_event(client, &event);
1da177e4 95
82ba56c2
DT
96 rcu_read_unlock();
97
1da177e4
LT
98 wake_up_interruptible(&evdev->wait);
99}
100
101static int evdev_fasync(int fd, struct file *file, int on)
102{
d0ffb9be 103 struct evdev_client *client = file->private_data;
1e0afb28 104
60aa4924 105 return fasync_helper(fd, file, on, &client->fasync);
1da177e4
LT
106}
107
1e0afb28 108static int evdev_flush(struct file *file, fl_owner_t id)
1da177e4 109{
d0ffb9be
DT
110 struct evdev_client *client = file->private_data;
111 struct evdev *evdev = client->evdev;
6addb1d6
DT
112 int retval;
113
114 retval = mutex_lock_interruptible(&evdev->mutex);
115 if (retval)
116 return retval;
1e0afb28 117
d0ffb9be 118 if (!evdev->exist)
6addb1d6
DT
119 retval = -ENODEV;
120 else
121 retval = input_flush_device(&evdev->handle, file);
1e0afb28 122
6addb1d6
DT
123 mutex_unlock(&evdev->mutex);
124 return retval;
1da177e4
LT
125}
126
9657d75c 127static void evdev_free(struct device *dev)
1da177e4 128{
9657d75c
DT
129 struct evdev *evdev = container_of(dev, struct evdev, dev);
130
a7097ff8 131 input_put_device(evdev->handle.dev);
1da177e4
LT
132 kfree(evdev);
133}
134
6addb1d6
DT
135/*
136 * Grabs an event device (along with underlying input device).
137 * This function is called with evdev->mutex taken.
138 */
139static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
140{
141 int error;
142
143 if (evdev->grab)
144 return -EBUSY;
145
146 error = input_grab_device(&evdev->handle);
147 if (error)
148 return error;
149
150 rcu_assign_pointer(evdev->grab, client);
82ba56c2 151 synchronize_rcu();
6addb1d6
DT
152
153 return 0;
154}
155
156static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
157{
158 if (evdev->grab != client)
159 return -EINVAL;
160
161 rcu_assign_pointer(evdev->grab, NULL);
82ba56c2 162 synchronize_rcu();
6addb1d6
DT
163 input_release_device(&evdev->handle);
164
165 return 0;
166}
167
168static void evdev_attach_client(struct evdev *evdev,
169 struct evdev_client *client)
170{
171 spin_lock(&evdev->client_lock);
172 list_add_tail_rcu(&client->node, &evdev->client_list);
173 spin_unlock(&evdev->client_lock);
82ba56c2 174 synchronize_rcu();
6addb1d6
DT
175}
176
177static void evdev_detach_client(struct evdev *evdev,
178 struct evdev_client *client)
179{
180 spin_lock(&evdev->client_lock);
181 list_del_rcu(&client->node);
182 spin_unlock(&evdev->client_lock);
82ba56c2 183 synchronize_rcu();
6addb1d6
DT
184}
185
186static int evdev_open_device(struct evdev *evdev)
187{
188 int retval;
189
190 retval = mutex_lock_interruptible(&evdev->mutex);
191 if (retval)
192 return retval;
193
194 if (!evdev->exist)
195 retval = -ENODEV;
06445014 196 else if (!evdev->open++) {
6addb1d6 197 retval = input_open_device(&evdev->handle);
06445014
ON
198 if (retval)
199 evdev->open--;
200 }
6addb1d6
DT
201
202 mutex_unlock(&evdev->mutex);
203 return retval;
204}
205
206static void evdev_close_device(struct evdev *evdev)
207{
208 mutex_lock(&evdev->mutex);
209
210 if (evdev->exist && !--evdev->open)
211 input_close_device(&evdev->handle);
212
213 mutex_unlock(&evdev->mutex);
214}
215
216/*
217 * Wake up users waiting for IO so they can disconnect from
218 * dead device.
219 */
220static void evdev_hangup(struct evdev *evdev)
221{
222 struct evdev_client *client;
223
224 spin_lock(&evdev->client_lock);
225 list_for_each_entry(client, &evdev->client_list, node)
226 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
227 spin_unlock(&evdev->client_lock);
228
229 wake_up_interruptible(&evdev->wait);
230}
231
d0ffb9be 232static int evdev_release(struct inode *inode, struct file *file)
1da177e4 233{
d0ffb9be
DT
234 struct evdev_client *client = file->private_data;
235 struct evdev *evdev = client->evdev;
1da177e4 236
6addb1d6
DT
237 mutex_lock(&evdev->mutex);
238 if (evdev->grab == client)
239 evdev_ungrab(evdev, client);
240 mutex_unlock(&evdev->mutex);
1da177e4 241
6addb1d6 242 evdev_detach_client(evdev, client);
d0ffb9be 243 kfree(client);
1da177e4 244
6addb1d6 245 evdev_close_device(evdev);
9657d75c 246 put_device(&evdev->dev);
1da177e4 247
1da177e4
LT
248 return 0;
249}
250
b58f7086
HR
251static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
252{
63a6404d
HR
253 unsigned int n_events =
254 max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
255 EVDEV_MIN_BUFFER_SIZE);
256
257 return roundup_pow_of_two(n_events);
b58f7086
HR
258}
259
d0ffb9be 260static int evdev_open(struct inode *inode, struct file *file)
1da177e4 261{
d0ffb9be 262 struct evdev *evdev;
6addb1d6 263 struct evdev_client *client;
1da177e4 264 int i = iminor(inode) - EVDEV_MINOR_BASE;
b58f7086 265 unsigned int bufsize;
d542ed82 266 int error;
1da177e4 267
d0ffb9be 268 if (i >= EVDEV_MINORS)
1da177e4
LT
269 return -ENODEV;
270
6addb1d6
DT
271 error = mutex_lock_interruptible(&evdev_table_mutex);
272 if (error)
273 return error;
d0ffb9be 274 evdev = evdev_table[i];
6addb1d6
DT
275 if (evdev)
276 get_device(&evdev->dev);
277 mutex_unlock(&evdev_table_mutex);
d0ffb9be 278
6addb1d6 279 if (!evdev)
1da177e4
LT
280 return -ENODEV;
281
b58f7086
HR
282 bufsize = evdev_compute_buffer_size(evdev->handle.dev);
283
284 client = kzalloc(sizeof(struct evdev_client) +
285 bufsize * sizeof(struct input_event),
286 GFP_KERNEL);
9657d75c
DT
287 if (!client) {
288 error = -ENOMEM;
289 goto err_put_evdev;
290 }
1da177e4 291
b58f7086 292 client->bufsize = bufsize;
6addb1d6 293 spin_lock_init(&client->buffer_lock);
d0ffb9be 294 client->evdev = evdev;
6addb1d6 295 evdev_attach_client(evdev, client);
1da177e4 296
6addb1d6
DT
297 error = evdev_open_device(evdev);
298 if (error)
299 goto err_free_client;
1da177e4 300
d0ffb9be 301 file->private_data = client;
3d7bbd45
DT
302 nonseekable_open(inode, file);
303
1da177e4 304 return 0;
9657d75c
DT
305
306 err_free_client:
6addb1d6 307 evdev_detach_client(evdev, client);
9657d75c
DT
308 kfree(client);
309 err_put_evdev:
310 put_device(&evdev->dev);
311 return error;
1da177e4
LT
312}
313
6addb1d6
DT
314static ssize_t evdev_write(struct file *file, const char __user *buffer,
315 size_t count, loff_t *ppos)
3a51f7c4 316{
d0ffb9be
DT
317 struct evdev_client *client = file->private_data;
318 struct evdev *evdev = client->evdev;
3a51f7c4 319 struct input_event event;
6addb1d6 320 int retval;
52658bb6 321
6addb1d6
DT
322 retval = mutex_lock_interruptible(&evdev->mutex);
323 if (retval)
324 return retval;
325
326 if (!evdev->exist) {
327 retval = -ENODEV;
328 goto out;
329 }
52658bb6 330
3a51f7c4
DT
331 while (retval < count) {
332
2d56f3a3 333 if (input_event_from_user(buffer + retval, &event)) {
6addb1d6
DT
334 retval = -EFAULT;
335 goto out;
336 }
337
338 input_inject_event(&evdev->handle,
339 event.type, event.code, event.value);
2d56f3a3 340 retval += input_event_size();
52658bb6
JK
341 }
342
6addb1d6
DT
343 out:
344 mutex_unlock(&evdev->mutex);
52658bb6
JK
345 return retval;
346}
52658bb6 347
6addb1d6
DT
348static int evdev_fetch_next_event(struct evdev_client *client,
349 struct input_event *event)
350{
351 int have_event;
352
353 spin_lock_irq(&client->buffer_lock);
354
355 have_event = client->head != client->tail;
356 if (have_event) {
357 *event = client->buffer[client->tail++];
b58f7086 358 client->tail &= client->bufsize - 1;
6addb1d6
DT
359 }
360
361 spin_unlock_irq(&client->buffer_lock);
362
363 return have_event;
364}
365
366static ssize_t evdev_read(struct file *file, char __user *buffer,
367 size_t count, loff_t *ppos)
1da177e4 368{
d0ffb9be
DT
369 struct evdev_client *client = file->private_data;
370 struct evdev *evdev = client->evdev;
6addb1d6 371 struct input_event event;
1da177e4
LT
372 int retval;
373
2d56f3a3 374 if (count < input_event_size())
1da177e4
LT
375 return -EINVAL;
376
6addb1d6
DT
377 if (client->head == client->tail && evdev->exist &&
378 (file->f_flags & O_NONBLOCK))
1da177e4
LT
379 return -EAGAIN;
380
d0ffb9be
DT
381 retval = wait_event_interruptible(evdev->wait,
382 client->head != client->tail || !evdev->exist);
1da177e4
LT
383 if (retval)
384 return retval;
385
d0ffb9be 386 if (!evdev->exist)
1da177e4
LT
387 return -ENODEV;
388
2d56f3a3 389 while (retval + input_event_size() <= count &&
6addb1d6 390 evdev_fetch_next_event(client, &event)) {
3a51f7c4 391
2d56f3a3 392 if (input_event_to_user(buffer + retval, &event))
3a51f7c4
DT
393 return -EFAULT;
394
2d56f3a3 395 retval += input_event_size();
1da177e4
LT
396 }
397
398 return retval;
399}
400
401/* No kernel lock - fine */
402static unsigned int evdev_poll(struct file *file, poll_table *wait)
403{
d0ffb9be
DT
404 struct evdev_client *client = file->private_data;
405 struct evdev *evdev = client->evdev;
c18fb139 406 unsigned int mask;
1e0afb28 407
d0ffb9be 408 poll_wait(file, &evdev->wait, wait);
c18fb139
DT
409
410 mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
411 if (client->head != client->tail)
412 mask |= POLLIN | POLLRDNORM;
413
414 return mask;
1da177e4
LT
415}
416
3a51f7c4
DT
417#ifdef CONFIG_COMPAT
418
419#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
7b19ada2 420#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
3a51f7c4
DT
421
422#ifdef __BIG_ENDIAN
423static int bits_to_user(unsigned long *bits, unsigned int maxbit,
424 unsigned int maxlen, void __user *p, int compat)
425{
426 int len, i;
427
428 if (compat) {
7b19ada2 429 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
bf61f8d3 430 if (len > maxlen)
3a51f7c4
DT
431 len = maxlen;
432
433 for (i = 0; i < len / sizeof(compat_long_t); i++)
434 if (copy_to_user((compat_long_t __user *) p + i,
435 (compat_long_t *) bits +
436 i + 1 - ((i % 2) << 1),
437 sizeof(compat_long_t)))
438 return -EFAULT;
439 } else {
7b19ada2 440 len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
441 if (len > maxlen)
442 len = maxlen;
443
444 if (copy_to_user(p, bits, len))
445 return -EFAULT;
446 }
447
448 return len;
449}
450#else
451static int bits_to_user(unsigned long *bits, unsigned int maxbit,
452 unsigned int maxlen, void __user *p, int compat)
453{
454 int len = compat ?
7b19ada2
JS
455 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
456 BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
457
458 if (len > maxlen)
459 len = maxlen;
460
461 return copy_to_user(p, bits, len) ? -EFAULT : len;
462}
463#endif /* __BIG_ENDIAN */
464
465#else
466
467static int bits_to_user(unsigned long *bits, unsigned int maxbit,
468 unsigned int maxlen, void __user *p, int compat)
469{
7b19ada2 470 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
471
472 if (len > maxlen)
473 len = maxlen;
474
475 return copy_to_user(p, bits, len) ? -EFAULT : len;
476}
477
478#endif /* CONFIG_COMPAT */
479
480static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
481{
482 int len;
483
484 if (!str)
485 return -ENOENT;
486
487 len = strlen(str) + 1;
488 if (len > maxlen)
489 len = maxlen;
490
491 return copy_to_user(p, str, len) ? -EFAULT : len;
492}
493
f2afa771 494#define OLD_KEY_MAX 0x1ff
448cd166
DT
495static int handle_eviocgbit(struct input_dev *dev,
496 unsigned int type, unsigned int size,
497 void __user *p, int compat_mode)
5402a734 498{
f2afa771 499 static unsigned long keymax_warn_time;
5402a734
LT
500 unsigned long *bits;
501 int len;
502
448cd166 503 switch (type) {
5402a734
LT
504
505 case 0: bits = dev->evbit; len = EV_MAX; break;
506 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
507 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
508 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
509 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
510 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
511 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
512 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
513 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
514 default: return -EINVAL;
515 }
f2afa771
DT
516
517 /*
518 * Work around bugs in userspace programs that like to do
519 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
520 * should be in bytes, not in bits.
521 */
448cd166 522 if (type == EV_KEY && size == OLD_KEY_MAX) {
f2afa771
DT
523 len = OLD_KEY_MAX;
524 if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
525 printk(KERN_WARNING
c85e2031
GU
526 "evdev.c(EVIOCGBIT): Suspicious buffer size %u, "
527 "limiting output to %zu bytes. See "
f2afa771
DT
528 "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
529 OLD_KEY_MAX,
530 BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
531 }
532
448cd166 533 return bits_to_user(bits, len, size, p, compat_mode);
5402a734 534}
f2afa771 535#undef OLD_KEY_MAX
5402a734 536
8613e4c2
MCC
537static int evdev_handle_get_keycode(struct input_dev *dev,
538 void __user *p, size_t size)
539{
540 struct input_keymap_entry ke;
541 int error;
542
543 memset(&ke, 0, sizeof(ke));
544
545 if (size == sizeof(unsigned int[2])) {
546 /* legacy case */
547 int __user *ip = (int __user *)p;
548
549 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
550 return -EFAULT;
551
552 ke.len = sizeof(unsigned int);
553 ke.flags = 0;
554
555 error = input_get_keycode(dev, &ke);
556 if (error)
557 return error;
558
559 if (put_user(ke.keycode, ip + 1))
560 return -EFAULT;
561
562 } else {
563 size = min(size, sizeof(ke));
564
565 if (copy_from_user(&ke, p, size))
566 return -EFAULT;
567
568 error = input_get_keycode(dev, &ke);
569 if (error)
570 return error;
571
572 if (copy_to_user(p, &ke, size))
573 return -EFAULT;
574 }
575 return 0;
576}
577
578static int evdev_handle_set_keycode(struct input_dev *dev,
579 void __user *p, size_t size)
580{
581 struct input_keymap_entry ke;
582
583 memset(&ke, 0, sizeof(ke));
584
585 if (size == sizeof(unsigned int[2])) {
586 /* legacy case */
587 int __user *ip = (int __user *)p;
588
589 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
590 return -EFAULT;
591
592 if (get_user(ke.keycode, ip + 1))
593 return -EFAULT;
594
595 ke.len = sizeof(unsigned int);
596 ke.flags = 0;
597
598 } else {
599 size = min(size, sizeof(ke));
600
601 if (copy_from_user(&ke, p, size))
602 return -EFAULT;
603
604 if (ke.len > sizeof(ke.scancode))
605 return -EINVAL;
606 }
607
608 return input_set_keycode(dev, &ke);
609}
610
6addb1d6
DT
611static long evdev_do_ioctl(struct file *file, unsigned int cmd,
612 void __user *p, int compat_mode)
1da177e4 613{
d0ffb9be
DT
614 struct evdev_client *client = file->private_data;
615 struct evdev *evdev = client->evdev;
1da177e4
LT
616 struct input_dev *dev = evdev->handle.dev;
617 struct input_absinfo abs;
509ca1a9 618 struct ff_effect effect;
3a51f7c4 619 int __user *ip = (int __user *)p;
58b93995 620 unsigned int i, t, u, v;
448cd166 621 unsigned int size;
509ca1a9 622 int error;
1da177e4 623
448cd166 624 /* First we check for fixed-length commands */
1da177e4
LT
625 switch (cmd) {
626
6addb1d6
DT
627 case EVIOCGVERSION:
628 return put_user(EV_VERSION, ip);
1da177e4 629
6addb1d6
DT
630 case EVIOCGID:
631 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
632 return -EFAULT;
633 return 0;
08791e5c 634
6addb1d6
DT
635 case EVIOCGREP:
636 if (!test_bit(EV_REP, dev->evbit))
637 return -ENOSYS;
638 if (put_user(dev->rep[REP_DELAY], ip))
639 return -EFAULT;
640 if (put_user(dev->rep[REP_PERIOD], ip + 1))
641 return -EFAULT;
642 return 0;
08791e5c 643
6addb1d6
DT
644 case EVIOCSREP:
645 if (!test_bit(EV_REP, dev->evbit))
646 return -ENOSYS;
647 if (get_user(u, ip))
648 return -EFAULT;
649 if (get_user(v, ip + 1))
650 return -EFAULT;
08791e5c 651
6addb1d6
DT
652 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
653 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
3a51f7c4 654
6addb1d6 655 return 0;
1da177e4 656
6addb1d6
DT
657 case EVIOCRMFF:
658 return input_ff_erase(dev, (int)(unsigned long) p, file);
1da177e4 659
6addb1d6
DT
660 case EVIOCGEFFECTS:
661 i = test_bit(EV_FF, dev->evbit) ?
662 dev->ff->max_effects : 0;
663 if (put_user(i, ip))
664 return -EFAULT;
665 return 0;
666
667 case EVIOCGRAB:
668 if (p)
669 return evdev_grab(evdev, client);
670 else
671 return evdev_ungrab(evdev, client);
448cd166 672 }
1da177e4 673
448cd166 674 size = _IOC_SIZE(cmd);
1da177e4 675
448cd166
DT
676 /* Now check variable-length commands */
677#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
448cd166 678 switch (EVIOC_MASK_SIZE(cmd)) {
41e979f8 679
448cd166
DT
680 case EVIOCGKEY(0):
681 return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode);
1da177e4 682
448cd166
DT
683 case EVIOCGLED(0):
684 return bits_to_user(dev->led, LED_MAX, size, p, compat_mode);
1da177e4 685
448cd166
DT
686 case EVIOCGSND(0):
687 return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode);
1da177e4 688
448cd166
DT
689 case EVIOCGSW(0):
690 return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode);
31581066 691
448cd166
DT
692 case EVIOCGNAME(0):
693 return str_to_user(dev->name, size, p);
1da177e4 694
448cd166
DT
695 case EVIOCGPHYS(0):
696 return str_to_user(dev->phys, size, p);
1da177e4 697
448cd166
DT
698 case EVIOCGUNIQ(0):
699 return str_to_user(dev->uniq, size, p);
1da177e4 700
448cd166
DT
701 case EVIOC_MASK_SIZE(EVIOCSFF):
702 if (input_ff_effect_from_user(p, size, &effect))
703 return -EFAULT;
1da177e4 704
448cd166 705 error = input_ff_upload(dev, &effect, file);
1da177e4 706
448cd166
DT
707 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
708 return -EFAULT;
41e979f8 709
448cd166 710 return error;
8613e4c2
MCC
711
712 case EVIOC_MASK_SIZE(EVIOCGKEYCODE):
713 return evdev_handle_get_keycode(dev, p, size);
714
715 case EVIOC_MASK_SIZE(EVIOCSKEYCODE):
716 return evdev_handle_set_keycode(dev, p, size);
448cd166 717 }
1da177e4 718
448cd166
DT
719 /* Multi-number variable-length handlers */
720 if (_IOC_TYPE(cmd) != 'E')
721 return -EINVAL;
1da177e4 722
448cd166 723 if (_IOC_DIR(cmd) == _IOC_READ) {
6addb1d6 724
448cd166
DT
725 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
726 return handle_eviocgbit(dev,
727 _IOC_NR(cmd) & EV_MAX, size,
728 p, compat_mode);
1da177e4 729
448cd166 730 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
f2278f31 731
0a74a1df
DM
732 if (!dev->absinfo)
733 return -EINVAL;
734
448cd166
DT
735 t = _IOC_NR(cmd) & ABS_MAX;
736 abs = dev->absinfo[t];
f2278f31 737
448cd166
DT
738 if (copy_to_user(p, &abs, min_t(size_t,
739 size, sizeof(struct input_absinfo))))
740 return -EFAULT;
f2278f31 741
448cd166
DT
742 return 0;
743 }
744 }
f2278f31 745
f9ce6eb5 746 if (_IOC_DIR(cmd) == _IOC_WRITE) {
f2278f31 747
448cd166 748 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
1da177e4 749
0a74a1df
DM
750 if (!dev->absinfo)
751 return -EINVAL;
752
448cd166 753 t = _IOC_NR(cmd) & ABS_MAX;
41e979f8 754
448cd166
DT
755 if (copy_from_user(&abs, p, min_t(size_t,
756 size, sizeof(struct input_absinfo))))
757 return -EFAULT;
1da177e4 758
448cd166
DT
759 if (size < sizeof(struct input_absinfo))
760 abs.resolution = 0;
d31b2865 761
448cd166
DT
762 /* We can't change number of reserved MT slots */
763 if (t == ABS_MT_SLOT)
764 return -EINVAL;
40d007e7 765
448cd166
DT
766 /*
767 * Take event lock to ensure that we are not
768 * changing device parameters in the middle
769 * of event.
770 */
771 spin_lock_irq(&dev->event_lock);
772 dev->absinfo[t] = abs;
773 spin_unlock_irq(&dev->event_lock);
6addb1d6 774
448cd166 775 return 0;
6addb1d6 776 }
1da177e4 777 }
448cd166 778
1da177e4
LT
779 return -EINVAL;
780}
1da177e4 781
6addb1d6
DT
782static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
783 void __user *p, int compat_mode)
784{
785 struct evdev_client *client = file->private_data;
786 struct evdev *evdev = client->evdev;
787 int retval;
788
789 retval = mutex_lock_interruptible(&evdev->mutex);
790 if (retval)
791 return retval;
792
793 if (!evdev->exist) {
794 retval = -ENODEV;
795 goto out;
796 }
797
798 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
799
800 out:
801 mutex_unlock(&evdev->mutex);
802 return retval;
803}
804
3a51f7c4
DT
805static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
806{
807 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
808}
41e979f8 809
3a51f7c4 810#ifdef CONFIG_COMPAT
6addb1d6
DT
811static long evdev_ioctl_compat(struct file *file,
812 unsigned int cmd, unsigned long arg)
52658bb6 813{
3a51f7c4 814 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1da177e4 815}
52658bb6 816#endif
1da177e4 817
66e66118 818static const struct file_operations evdev_fops = {
6addb1d6
DT
819 .owner = THIS_MODULE,
820 .read = evdev_read,
821 .write = evdev_write,
822 .poll = evdev_poll,
823 .open = evdev_open,
824 .release = evdev_release,
825 .unlocked_ioctl = evdev_ioctl,
52658bb6 826#ifdef CONFIG_COMPAT
6addb1d6 827 .compat_ioctl = evdev_ioctl_compat,
52658bb6 828#endif
6addb1d6 829 .fasync = evdev_fasync,
6038f373
AB
830 .flush = evdev_flush,
831 .llseek = no_llseek,
1da177e4
LT
832};
833
6addb1d6
DT
834static int evdev_install_chrdev(struct evdev *evdev)
835{
836 /*
837 * No need to do any locking here as calls to connect and
838 * disconnect are serialized by the input core
839 */
840 evdev_table[evdev->minor] = evdev;
841 return 0;
842}
843
844static void evdev_remove_chrdev(struct evdev *evdev)
845{
846 /*
847 * Lock evdev table to prevent race with evdev_open()
848 */
849 mutex_lock(&evdev_table_mutex);
850 evdev_table[evdev->minor] = NULL;
851 mutex_unlock(&evdev_table_mutex);
852}
853
854/*
855 * Mark device non-existent. This disables writes, ioctls and
856 * prevents new users from opening the device. Already posted
857 * blocking reads will stay, however new ones will fail.
858 */
859static void evdev_mark_dead(struct evdev *evdev)
860{
861 mutex_lock(&evdev->mutex);
20da92de 862 evdev->exist = false;
6addb1d6
DT
863 mutex_unlock(&evdev->mutex);
864}
865
866static void evdev_cleanup(struct evdev *evdev)
867{
868 struct input_handle *handle = &evdev->handle;
869
870 evdev_mark_dead(evdev);
871 evdev_hangup(evdev);
872 evdev_remove_chrdev(evdev);
873
874 /* evdev is marked dead so no one else accesses evdev->open */
875 if (evdev->open) {
876 input_flush_device(handle, NULL);
877 input_close_device(handle);
878 }
879}
880
881/*
882 * Create new evdev device. Note that input core serializes calls
883 * to connect and disconnect so we don't need to lock evdev_table here.
884 */
5b2a0826
DT
885static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
886 const struct input_device_id *id)
1da177e4
LT
887{
888 struct evdev *evdev;
889 int minor;
5b2a0826 890 int error;
1da177e4 891
6addb1d6
DT
892 for (minor = 0; minor < EVDEV_MINORS; minor++)
893 if (!evdev_table[minor])
894 break;
895
1da177e4
LT
896 if (minor == EVDEV_MINORS) {
897 printk(KERN_ERR "evdev: no more free evdev devices\n");
5b2a0826 898 return -ENFILE;
1da177e4
LT
899 }
900
5b2a0826
DT
901 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
902 if (!evdev)
903 return -ENOMEM;
1da177e4 904
d0ffb9be 905 INIT_LIST_HEAD(&evdev->client_list);
6addb1d6
DT
906 spin_lock_init(&evdev->client_lock);
907 mutex_init(&evdev->mutex);
1da177e4
LT
908 init_waitqueue_head(&evdev->wait);
909
3d5cb60e 910 dev_set_name(&evdev->dev, "event%d", minor);
20da92de 911 evdev->exist = true;
1da177e4 912 evdev->minor = minor;
6addb1d6 913
a7097ff8 914 evdev->handle.dev = input_get_device(dev);
3d5cb60e 915 evdev->handle.name = dev_name(&evdev->dev);
1da177e4
LT
916 evdev->handle.handler = handler;
917 evdev->handle.private = evdev;
1da177e4 918
6addb1d6 919 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
9657d75c
DT
920 evdev->dev.class = &input_class;
921 evdev->dev.parent = &dev->dev;
9657d75c
DT
922 evdev->dev.release = evdev_free;
923 device_initialize(&evdev->dev);
5b2a0826 924
6addb1d6 925 error = input_register_handle(&evdev->handle);
5b2a0826 926 if (error)
9657d75c 927 goto err_free_evdev;
5b2a0826 928
6addb1d6
DT
929 error = evdev_install_chrdev(evdev);
930 if (error)
931 goto err_unregister_handle;
932
933 error = device_add(&evdev->dev);
5b2a0826 934 if (error)
6addb1d6 935 goto err_cleanup_evdev;
1da177e4 936
5b2a0826 937 return 0;
1da177e4 938
6addb1d6
DT
939 err_cleanup_evdev:
940 evdev_cleanup(evdev);
941 err_unregister_handle:
942 input_unregister_handle(&evdev->handle);
5b2a0826 943 err_free_evdev:
9657d75c 944 put_device(&evdev->dev);
5b2a0826 945 return error;
1da177e4
LT
946}
947
948static void evdev_disconnect(struct input_handle *handle)
949{
950 struct evdev *evdev = handle->private;
1da177e4 951
9657d75c 952 device_del(&evdev->dev);
6addb1d6
DT
953 evdev_cleanup(evdev);
954 input_unregister_handle(handle);
9657d75c 955 put_device(&evdev->dev);
1da177e4
LT
956}
957
66e66118 958static const struct input_device_id evdev_ids[] = {
1da177e4
LT
959 { .driver_info = 1 }, /* Matches all devices */
960 { }, /* Terminating zero entry */
961};
962
963MODULE_DEVICE_TABLE(input, evdev_ids);
964
965static struct input_handler evdev_handler = {
6addb1d6
DT
966 .event = evdev_event,
967 .connect = evdev_connect,
968 .disconnect = evdev_disconnect,
969 .fops = &evdev_fops,
970 .minor = EVDEV_MINOR_BASE,
971 .name = "evdev",
972 .id_table = evdev_ids,
1da177e4
LT
973};
974
975static int __init evdev_init(void)
976{
4263cf0f 977 return input_register_handler(&evdev_handler);
1da177e4
LT
978}
979
980static void __exit evdev_exit(void)
981{
982 input_unregister_handler(&evdev_handler);
983}
984
985module_init(evdev_init);
986module_exit(evdev_exit);
987
988MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
989MODULE_DESCRIPTION("Input driver event char devices");
990MODULE_LICENSE("GPL");