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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
da0c4901
JP
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
1da177e4
LT
13#define EVDEV_MINOR_BASE 64
14#define EVDEV_MINORS 32
63a6404d
HR
15#define EVDEV_MIN_BUFFER_SIZE 64U
16#define EVDEV_BUF_PACKETS 8
1da177e4
LT
17
18#include <linux/poll.h>
a99bbaf5 19#include <linux/sched.h>
1da177e4
LT
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/input.h>
24#include <linux/major.h>
1da177e4 25#include <linux/device.h>
2d56f3a3 26#include "input-compat.h"
1da177e4
LT
27
28struct evdev {
1da177e4
LT
29 int open;
30 int minor;
1da177e4
LT
31 struct input_handle handle;
32 wait_queue_head_t wait;
2be85279 33 struct evdev_client __rcu *grab;
d0ffb9be 34 struct list_head client_list;
6addb1d6
DT
35 spinlock_t client_lock; /* protects client_list */
36 struct mutex mutex;
9657d75c 37 struct device dev;
20da92de 38 bool exist;
1da177e4
LT
39};
40
d0ffb9be 41struct evdev_client {
9fb0f14e
JB
42 unsigned int head;
43 unsigned int tail;
cdda911c 44 unsigned int packet_head; /* [future] position of the first element of next packet */
6addb1d6 45 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
1da177e4
LT
46 struct fasync_struct *fasync;
47 struct evdev *evdev;
48 struct list_head node;
9fb0f14e 49 unsigned int bufsize;
b58f7086 50 struct input_event buffer[];
1da177e4
LT
51};
52
53static struct evdev *evdev_table[EVDEV_MINORS];
6addb1d6 54static DEFINE_MUTEX(evdev_table_mutex);
1da177e4 55
6addb1d6
DT
56static void evdev_pass_event(struct evdev_client *client,
57 struct input_event *event)
58{
9fb0f14e 59 /* Interrupts are disabled, just acquire the lock. */
6addb1d6 60 spin_lock(&client->buffer_lock);
9fb0f14e
JB
61
62 client->buffer[client->head++] = *event;
63 client->head &= client->bufsize - 1;
64
65 if (unlikely(client->head == client->tail)) {
66 /*
67 * This effectively "drops" all unconsumed events, leaving
68 * EV_SYN/SYN_DROPPED plus the newest event in the queue.
69 */
70 client->tail = (client->head - 2) & (client->bufsize - 1);
71
72 client->buffer[client->tail].time = event->time;
73 client->buffer[client->tail].type = EV_SYN;
74 client->buffer[client->tail].code = SYN_DROPPED;
75 client->buffer[client->tail].value = 0;
9fb0f14e 76
cdda911c
JB
77 client->packet_head = client->tail;
78 }
6addb1d6 79
cdda911c
JB
80 if (event->type == EV_SYN && event->code == SYN_REPORT) {
81 client->packet_head = client->head;
30a589fd 82 kill_fasync(&client->fasync, SIGIO, POLL_IN);
cdda911c
JB
83 }
84
85 spin_unlock(&client->buffer_lock);
6addb1d6
DT
86}
87
88/*
82ba56c2 89 * Pass incoming event to all connected clients.
6addb1d6
DT
90 */
91static void evdev_event(struct input_handle *handle,
92 unsigned int type, unsigned int code, int value)
1da177e4
LT
93{
94 struct evdev *evdev = handle->private;
d0ffb9be 95 struct evdev_client *client;
6addb1d6 96 struct input_event event;
1da177e4 97
6addb1d6
DT
98 do_gettimeofday(&event.time);
99 event.type = type;
100 event.code = code;
101 event.value = value;
1da177e4 102
82ba56c2
DT
103 rcu_read_lock();
104
6addb1d6
DT
105 client = rcu_dereference(evdev->grab);
106 if (client)
107 evdev_pass_event(client, &event);
108 else
109 list_for_each_entry_rcu(client, &evdev->client_list, node)
110 evdev_pass_event(client, &event);
1da177e4 111
82ba56c2
DT
112 rcu_read_unlock();
113
da40b0b6
DT
114 if (type == EV_SYN && code == SYN_REPORT)
115 wake_up_interruptible(&evdev->wait);
1da177e4
LT
116}
117
118static int evdev_fasync(int fd, struct file *file, int on)
119{
d0ffb9be 120 struct evdev_client *client = file->private_data;
1e0afb28 121
60aa4924 122 return fasync_helper(fd, file, on, &client->fasync);
1da177e4
LT
123}
124
1e0afb28 125static int evdev_flush(struct file *file, fl_owner_t id)
1da177e4 126{
d0ffb9be
DT
127 struct evdev_client *client = file->private_data;
128 struct evdev *evdev = client->evdev;
6addb1d6
DT
129 int retval;
130
131 retval = mutex_lock_interruptible(&evdev->mutex);
132 if (retval)
133 return retval;
1e0afb28 134
d0ffb9be 135 if (!evdev->exist)
6addb1d6
DT
136 retval = -ENODEV;
137 else
138 retval = input_flush_device(&evdev->handle, file);
1e0afb28 139
6addb1d6
DT
140 mutex_unlock(&evdev->mutex);
141 return retval;
1da177e4
LT
142}
143
9657d75c 144static void evdev_free(struct device *dev)
1da177e4 145{
9657d75c
DT
146 struct evdev *evdev = container_of(dev, struct evdev, dev);
147
a7097ff8 148 input_put_device(evdev->handle.dev);
1da177e4
LT
149 kfree(evdev);
150}
151
6addb1d6
DT
152/*
153 * Grabs an event device (along with underlying input device).
154 * This function is called with evdev->mutex taken.
155 */
156static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
157{
158 int error;
159
160 if (evdev->grab)
161 return -EBUSY;
162
163 error = input_grab_device(&evdev->handle);
164 if (error)
165 return error;
166
167 rcu_assign_pointer(evdev->grab, client);
6addb1d6
DT
168
169 return 0;
170}
171
172static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
173{
174 if (evdev->grab != client)
175 return -EINVAL;
176
177 rcu_assign_pointer(evdev->grab, NULL);
82ba56c2 178 synchronize_rcu();
6addb1d6
DT
179 input_release_device(&evdev->handle);
180
181 return 0;
182}
183
184static void evdev_attach_client(struct evdev *evdev,
185 struct evdev_client *client)
186{
187 spin_lock(&evdev->client_lock);
188 list_add_tail_rcu(&client->node, &evdev->client_list);
189 spin_unlock(&evdev->client_lock);
6addb1d6
DT
190}
191
192static void evdev_detach_client(struct evdev *evdev,
193 struct evdev_client *client)
194{
195 spin_lock(&evdev->client_lock);
196 list_del_rcu(&client->node);
197 spin_unlock(&evdev->client_lock);
82ba56c2 198 synchronize_rcu();
6addb1d6
DT
199}
200
201static int evdev_open_device(struct evdev *evdev)
202{
203 int retval;
204
205 retval = mutex_lock_interruptible(&evdev->mutex);
206 if (retval)
207 return retval;
208
209 if (!evdev->exist)
210 retval = -ENODEV;
06445014 211 else if (!evdev->open++) {
6addb1d6 212 retval = input_open_device(&evdev->handle);
06445014
ON
213 if (retval)
214 evdev->open--;
215 }
6addb1d6
DT
216
217 mutex_unlock(&evdev->mutex);
218 return retval;
219}
220
221static void evdev_close_device(struct evdev *evdev)
222{
223 mutex_lock(&evdev->mutex);
224
225 if (evdev->exist && !--evdev->open)
226 input_close_device(&evdev->handle);
227
228 mutex_unlock(&evdev->mutex);
229}
230
231/*
232 * Wake up users waiting for IO so they can disconnect from
233 * dead device.
234 */
235static void evdev_hangup(struct evdev *evdev)
236{
237 struct evdev_client *client;
238
239 spin_lock(&evdev->client_lock);
240 list_for_each_entry(client, &evdev->client_list, node)
241 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
242 spin_unlock(&evdev->client_lock);
243
244 wake_up_interruptible(&evdev->wait);
245}
246
d0ffb9be 247static int evdev_release(struct inode *inode, struct file *file)
1da177e4 248{
d0ffb9be
DT
249 struct evdev_client *client = file->private_data;
250 struct evdev *evdev = client->evdev;
1da177e4 251
6addb1d6
DT
252 mutex_lock(&evdev->mutex);
253 if (evdev->grab == client)
254 evdev_ungrab(evdev, client);
255 mutex_unlock(&evdev->mutex);
1da177e4 256
6addb1d6 257 evdev_detach_client(evdev, client);
d0ffb9be 258 kfree(client);
1da177e4 259
6addb1d6 260 evdev_close_device(evdev);
9657d75c 261 put_device(&evdev->dev);
1da177e4 262
1da177e4
LT
263 return 0;
264}
265
b58f7086
HR
266static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
267{
63a6404d
HR
268 unsigned int n_events =
269 max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
270 EVDEV_MIN_BUFFER_SIZE);
271
272 return roundup_pow_of_two(n_events);
b58f7086
HR
273}
274
d0ffb9be 275static int evdev_open(struct inode *inode, struct file *file)
1da177e4 276{
d0ffb9be 277 struct evdev *evdev;
6addb1d6 278 struct evdev_client *client;
1da177e4 279 int i = iminor(inode) - EVDEV_MINOR_BASE;
b58f7086 280 unsigned int bufsize;
d542ed82 281 int error;
1da177e4 282
d0ffb9be 283 if (i >= EVDEV_MINORS)
1da177e4
LT
284 return -ENODEV;
285
6addb1d6
DT
286 error = mutex_lock_interruptible(&evdev_table_mutex);
287 if (error)
288 return error;
d0ffb9be 289 evdev = evdev_table[i];
6addb1d6
DT
290 if (evdev)
291 get_device(&evdev->dev);
292 mutex_unlock(&evdev_table_mutex);
d0ffb9be 293
6addb1d6 294 if (!evdev)
1da177e4
LT
295 return -ENODEV;
296
b58f7086
HR
297 bufsize = evdev_compute_buffer_size(evdev->handle.dev);
298
299 client = kzalloc(sizeof(struct evdev_client) +
300 bufsize * sizeof(struct input_event),
301 GFP_KERNEL);
9657d75c
DT
302 if (!client) {
303 error = -ENOMEM;
304 goto err_put_evdev;
305 }
1da177e4 306
b58f7086 307 client->bufsize = bufsize;
6addb1d6 308 spin_lock_init(&client->buffer_lock);
d0ffb9be 309 client->evdev = evdev;
6addb1d6 310 evdev_attach_client(evdev, client);
1da177e4 311
6addb1d6
DT
312 error = evdev_open_device(evdev);
313 if (error)
314 goto err_free_client;
1da177e4 315
d0ffb9be 316 file->private_data = client;
3d7bbd45
DT
317 nonseekable_open(inode, file);
318
1da177e4 319 return 0;
9657d75c
DT
320
321 err_free_client:
6addb1d6 322 evdev_detach_client(evdev, client);
9657d75c
DT
323 kfree(client);
324 err_put_evdev:
325 put_device(&evdev->dev);
326 return error;
1da177e4
LT
327}
328
6addb1d6
DT
329static ssize_t evdev_write(struct file *file, const char __user *buffer,
330 size_t count, loff_t *ppos)
3a51f7c4 331{
d0ffb9be
DT
332 struct evdev_client *client = file->private_data;
333 struct evdev *evdev = client->evdev;
3a51f7c4 334 struct input_event event;
6addb1d6 335 int retval;
52658bb6 336
439581ec
PK
337 if (count < input_event_size())
338 return -EINVAL;
339
6addb1d6
DT
340 retval = mutex_lock_interruptible(&evdev->mutex);
341 if (retval)
342 return retval;
343
344 if (!evdev->exist) {
345 retval = -ENODEV;
346 goto out;
347 }
52658bb6 348
439581ec 349 do {
2d56f3a3 350 if (input_event_from_user(buffer + retval, &event)) {
6addb1d6
DT
351 retval = -EFAULT;
352 goto out;
353 }
439581ec 354 retval += input_event_size();
6addb1d6
DT
355
356 input_inject_event(&evdev->handle,
357 event.type, event.code, event.value);
439581ec 358 } while (retval + input_event_size() <= count);
52658bb6 359
6addb1d6
DT
360 out:
361 mutex_unlock(&evdev->mutex);
52658bb6
JK
362 return retval;
363}
52658bb6 364
6addb1d6
DT
365static int evdev_fetch_next_event(struct evdev_client *client,
366 struct input_event *event)
367{
368 int have_event;
369
370 spin_lock_irq(&client->buffer_lock);
371
372 have_event = client->head != client->tail;
373 if (have_event) {
374 *event = client->buffer[client->tail++];
b58f7086 375 client->tail &= client->bufsize - 1;
6addb1d6
DT
376 }
377
378 spin_unlock_irq(&client->buffer_lock);
379
380 return have_event;
381}
382
383static ssize_t evdev_read(struct file *file, char __user *buffer,
384 size_t count, loff_t *ppos)
1da177e4 385{
d0ffb9be
DT
386 struct evdev_client *client = file->private_data;
387 struct evdev *evdev = client->evdev;
6addb1d6 388 struct input_event event;
1da177e4
LT
389 int retval;
390
2d56f3a3 391 if (count < input_event_size())
1da177e4
LT
392 return -EINVAL;
393
cdda911c 394 if (client->packet_head == client->tail && evdev->exist &&
6addb1d6 395 (file->f_flags & O_NONBLOCK))
1da177e4
LT
396 return -EAGAIN;
397
d0ffb9be 398 retval = wait_event_interruptible(evdev->wait,
cdda911c 399 client->packet_head != client->tail || !evdev->exist);
1da177e4
LT
400 if (retval)
401 return retval;
402
d0ffb9be 403 if (!evdev->exist)
1da177e4
LT
404 return -ENODEV;
405
2d56f3a3 406 while (retval + input_event_size() <= count &&
6addb1d6 407 evdev_fetch_next_event(client, &event)) {
3a51f7c4 408
2d56f3a3 409 if (input_event_to_user(buffer + retval, &event))
3a51f7c4
DT
410 return -EFAULT;
411
2d56f3a3 412 retval += input_event_size();
1da177e4
LT
413 }
414
415 return retval;
416}
417
418/* No kernel lock - fine */
419static unsigned int evdev_poll(struct file *file, poll_table *wait)
420{
d0ffb9be
DT
421 struct evdev_client *client = file->private_data;
422 struct evdev *evdev = client->evdev;
c18fb139 423 unsigned int mask;
1e0afb28 424
d0ffb9be 425 poll_wait(file, &evdev->wait, wait);
c18fb139
DT
426
427 mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
cdda911c 428 if (client->packet_head != client->tail)
c18fb139
DT
429 mask |= POLLIN | POLLRDNORM;
430
431 return mask;
1da177e4
LT
432}
433
3a51f7c4
DT
434#ifdef CONFIG_COMPAT
435
436#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
7b19ada2 437#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
3a51f7c4
DT
438
439#ifdef __BIG_ENDIAN
440static int bits_to_user(unsigned long *bits, unsigned int maxbit,
441 unsigned int maxlen, void __user *p, int compat)
442{
443 int len, i;
444
445 if (compat) {
7b19ada2 446 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
bf61f8d3 447 if (len > maxlen)
3a51f7c4
DT
448 len = maxlen;
449
450 for (i = 0; i < len / sizeof(compat_long_t); i++)
451 if (copy_to_user((compat_long_t __user *) p + i,
452 (compat_long_t *) bits +
453 i + 1 - ((i % 2) << 1),
454 sizeof(compat_long_t)))
455 return -EFAULT;
456 } else {
7b19ada2 457 len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
458 if (len > maxlen)
459 len = maxlen;
460
461 if (copy_to_user(p, bits, len))
462 return -EFAULT;
463 }
464
465 return len;
466}
467#else
468static int bits_to_user(unsigned long *bits, unsigned int maxbit,
469 unsigned int maxlen, void __user *p, int compat)
470{
471 int len = compat ?
7b19ada2
JS
472 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
473 BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
474
475 if (len > maxlen)
476 len = maxlen;
477
478 return copy_to_user(p, bits, len) ? -EFAULT : len;
479}
480#endif /* __BIG_ENDIAN */
481
482#else
483
484static int bits_to_user(unsigned long *bits, unsigned int maxbit,
485 unsigned int maxlen, void __user *p, int compat)
486{
7b19ada2 487 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
488
489 if (len > maxlen)
490 len = maxlen;
491
492 return copy_to_user(p, bits, len) ? -EFAULT : len;
493}
494
495#endif /* CONFIG_COMPAT */
496
497static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
498{
499 int len;
500
501 if (!str)
502 return -ENOENT;
503
504 len = strlen(str) + 1;
505 if (len > maxlen)
506 len = maxlen;
507
508 return copy_to_user(p, str, len) ? -EFAULT : len;
509}
510
f2afa771 511#define OLD_KEY_MAX 0x1ff
448cd166
DT
512static int handle_eviocgbit(struct input_dev *dev,
513 unsigned int type, unsigned int size,
514 void __user *p, int compat_mode)
5402a734 515{
f2afa771 516 static unsigned long keymax_warn_time;
5402a734
LT
517 unsigned long *bits;
518 int len;
519
448cd166 520 switch (type) {
5402a734
LT
521
522 case 0: bits = dev->evbit; len = EV_MAX; break;
523 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
524 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
525 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
526 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
527 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
528 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
529 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
530 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
531 default: return -EINVAL;
532 }
f2afa771
DT
533
534 /*
535 * Work around bugs in userspace programs that like to do
536 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
537 * should be in bytes, not in bits.
538 */
448cd166 539 if (type == EV_KEY && size == OLD_KEY_MAX) {
f2afa771
DT
540 len = OLD_KEY_MAX;
541 if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
da0c4901
JP
542 pr_warning("(EVIOCGBIT): Suspicious buffer size %u, "
543 "limiting output to %zu bytes. See "
544 "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
545 OLD_KEY_MAX,
546 BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
f2afa771
DT
547 }
548
448cd166 549 return bits_to_user(bits, len, size, p, compat_mode);
5402a734 550}
f2afa771 551#undef OLD_KEY_MAX
5402a734 552
ab4e0192 553static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
8613e4c2 554{
ab4e0192
DT
555 struct input_keymap_entry ke = {
556 .len = sizeof(unsigned int),
557 .flags = 0,
558 };
559 int __user *ip = (int __user *)p;
8613e4c2
MCC
560 int error;
561
ab4e0192
DT
562 /* legacy case */
563 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
564 return -EFAULT;
8613e4c2 565
ab4e0192
DT
566 error = input_get_keycode(dev, &ke);
567 if (error)
568 return error;
8613e4c2 569
ab4e0192
DT
570 if (put_user(ke.keycode, ip + 1))
571 return -EFAULT;
8613e4c2 572
ab4e0192
DT
573 return 0;
574}
8613e4c2 575
ab4e0192
DT
576static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
577{
578 struct input_keymap_entry ke;
579 int error;
8613e4c2 580
ab4e0192
DT
581 if (copy_from_user(&ke, p, sizeof(ke)))
582 return -EFAULT;
8613e4c2 583
ab4e0192
DT
584 error = input_get_keycode(dev, &ke);
585 if (error)
586 return error;
8613e4c2 587
ab4e0192
DT
588 if (copy_to_user(p, &ke, sizeof(ke)))
589 return -EFAULT;
8613e4c2 590
8613e4c2
MCC
591 return 0;
592}
593
ab4e0192 594static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
8613e4c2 595{
ab4e0192
DT
596 struct input_keymap_entry ke = {
597 .len = sizeof(unsigned int),
598 .flags = 0,
599 };
600 int __user *ip = (int __user *)p;
8613e4c2 601
ab4e0192
DT
602 if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
603 return -EFAULT;
8613e4c2 604
ab4e0192
DT
605 if (get_user(ke.keycode, ip + 1))
606 return -EFAULT;
8613e4c2 607
ab4e0192
DT
608 return input_set_keycode(dev, &ke);
609}
8613e4c2 610
ab4e0192
DT
611static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
612{
613 struct input_keymap_entry ke;
8613e4c2 614
ab4e0192
DT
615 if (copy_from_user(&ke, p, sizeof(ke)))
616 return -EFAULT;
8613e4c2 617
ab4e0192
DT
618 if (ke.len > sizeof(ke.scancode))
619 return -EINVAL;
8613e4c2
MCC
620
621 return input_set_keycode(dev, &ke);
622}
623
6addb1d6
DT
624static long evdev_do_ioctl(struct file *file, unsigned int cmd,
625 void __user *p, int compat_mode)
1da177e4 626{
d0ffb9be
DT
627 struct evdev_client *client = file->private_data;
628 struct evdev *evdev = client->evdev;
1da177e4
LT
629 struct input_dev *dev = evdev->handle.dev;
630 struct input_absinfo abs;
509ca1a9 631 struct ff_effect effect;
3a51f7c4 632 int __user *ip = (int __user *)p;
58b93995 633 unsigned int i, t, u, v;
448cd166 634 unsigned int size;
509ca1a9 635 int error;
1da177e4 636
448cd166 637 /* First we check for fixed-length commands */
1da177e4
LT
638 switch (cmd) {
639
6addb1d6
DT
640 case EVIOCGVERSION:
641 return put_user(EV_VERSION, ip);
1da177e4 642
6addb1d6
DT
643 case EVIOCGID:
644 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
645 return -EFAULT;
646 return 0;
08791e5c 647
6addb1d6
DT
648 case EVIOCGREP:
649 if (!test_bit(EV_REP, dev->evbit))
650 return -ENOSYS;
651 if (put_user(dev->rep[REP_DELAY], ip))
652 return -EFAULT;
653 if (put_user(dev->rep[REP_PERIOD], ip + 1))
654 return -EFAULT;
655 return 0;
08791e5c 656
6addb1d6
DT
657 case EVIOCSREP:
658 if (!test_bit(EV_REP, dev->evbit))
659 return -ENOSYS;
660 if (get_user(u, ip))
661 return -EFAULT;
662 if (get_user(v, ip + 1))
663 return -EFAULT;
08791e5c 664
6addb1d6
DT
665 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
666 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
3a51f7c4 667
6addb1d6 668 return 0;
1da177e4 669
6addb1d6
DT
670 case EVIOCRMFF:
671 return input_ff_erase(dev, (int)(unsigned long) p, file);
1da177e4 672
6addb1d6
DT
673 case EVIOCGEFFECTS:
674 i = test_bit(EV_FF, dev->evbit) ?
675 dev->ff->max_effects : 0;
676 if (put_user(i, ip))
677 return -EFAULT;
678 return 0;
679
680 case EVIOCGRAB:
681 if (p)
682 return evdev_grab(evdev, client);
683 else
684 return evdev_ungrab(evdev, client);
ab4e0192
DT
685
686 case EVIOCGKEYCODE:
687 return evdev_handle_get_keycode(dev, p);
688
689 case EVIOCSKEYCODE:
690 return evdev_handle_set_keycode(dev, p);
691
692 case EVIOCGKEYCODE_V2:
693 return evdev_handle_get_keycode_v2(dev, p);
694
695 case EVIOCSKEYCODE_V2:
696 return evdev_handle_set_keycode_v2(dev, p);
448cd166 697 }
1da177e4 698
448cd166 699 size = _IOC_SIZE(cmd);
1da177e4 700
448cd166
DT
701 /* Now check variable-length commands */
702#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
448cd166 703 switch (EVIOC_MASK_SIZE(cmd)) {
41e979f8 704
85b77200
HR
705 case EVIOCGPROP(0):
706 return bits_to_user(dev->propbit, INPUT_PROP_MAX,
707 size, p, compat_mode);
708
448cd166
DT
709 case EVIOCGKEY(0):
710 return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode);
1da177e4 711
448cd166
DT
712 case EVIOCGLED(0):
713 return bits_to_user(dev->led, LED_MAX, size, p, compat_mode);
1da177e4 714
448cd166
DT
715 case EVIOCGSND(0):
716 return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode);
1da177e4 717
448cd166
DT
718 case EVIOCGSW(0):
719 return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode);
31581066 720
448cd166
DT
721 case EVIOCGNAME(0):
722 return str_to_user(dev->name, size, p);
1da177e4 723
448cd166
DT
724 case EVIOCGPHYS(0):
725 return str_to_user(dev->phys, size, p);
1da177e4 726
448cd166
DT
727 case EVIOCGUNIQ(0):
728 return str_to_user(dev->uniq, size, p);
1da177e4 729
448cd166
DT
730 case EVIOC_MASK_SIZE(EVIOCSFF):
731 if (input_ff_effect_from_user(p, size, &effect))
732 return -EFAULT;
1da177e4 733
448cd166 734 error = input_ff_upload(dev, &effect, file);
1da177e4 735
448cd166
DT
736 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
737 return -EFAULT;
41e979f8 738
448cd166
DT
739 return error;
740 }
1da177e4 741
448cd166
DT
742 /* Multi-number variable-length handlers */
743 if (_IOC_TYPE(cmd) != 'E')
744 return -EINVAL;
1da177e4 745
448cd166 746 if (_IOC_DIR(cmd) == _IOC_READ) {
6addb1d6 747
448cd166
DT
748 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
749 return handle_eviocgbit(dev,
750 _IOC_NR(cmd) & EV_MAX, size,
751 p, compat_mode);
1da177e4 752
448cd166 753 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
f2278f31 754
0a74a1df
DM
755 if (!dev->absinfo)
756 return -EINVAL;
757
448cd166
DT
758 t = _IOC_NR(cmd) & ABS_MAX;
759 abs = dev->absinfo[t];
f2278f31 760
448cd166
DT
761 if (copy_to_user(p, &abs, min_t(size_t,
762 size, sizeof(struct input_absinfo))))
763 return -EFAULT;
f2278f31 764
448cd166
DT
765 return 0;
766 }
767 }
f2278f31 768
f9ce6eb5 769 if (_IOC_DIR(cmd) == _IOC_WRITE) {
f2278f31 770
448cd166 771 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
1da177e4 772
0a74a1df
DM
773 if (!dev->absinfo)
774 return -EINVAL;
775
448cd166 776 t = _IOC_NR(cmd) & ABS_MAX;
41e979f8 777
448cd166
DT
778 if (copy_from_user(&abs, p, min_t(size_t,
779 size, sizeof(struct input_absinfo))))
780 return -EFAULT;
1da177e4 781
448cd166
DT
782 if (size < sizeof(struct input_absinfo))
783 abs.resolution = 0;
d31b2865 784
448cd166
DT
785 /* We can't change number of reserved MT slots */
786 if (t == ABS_MT_SLOT)
787 return -EINVAL;
40d007e7 788
448cd166
DT
789 /*
790 * Take event lock to ensure that we are not
791 * changing device parameters in the middle
792 * of event.
793 */
794 spin_lock_irq(&dev->event_lock);
795 dev->absinfo[t] = abs;
796 spin_unlock_irq(&dev->event_lock);
6addb1d6 797
448cd166 798 return 0;
6addb1d6 799 }
1da177e4 800 }
448cd166 801
1da177e4
LT
802 return -EINVAL;
803}
1da177e4 804
6addb1d6
DT
805static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
806 void __user *p, int compat_mode)
807{
808 struct evdev_client *client = file->private_data;
809 struct evdev *evdev = client->evdev;
810 int retval;
811
812 retval = mutex_lock_interruptible(&evdev->mutex);
813 if (retval)
814 return retval;
815
816 if (!evdev->exist) {
817 retval = -ENODEV;
818 goto out;
819 }
820
821 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
822
823 out:
824 mutex_unlock(&evdev->mutex);
825 return retval;
826}
827
3a51f7c4
DT
828static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
829{
830 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
831}
41e979f8 832
3a51f7c4 833#ifdef CONFIG_COMPAT
6addb1d6
DT
834static long evdev_ioctl_compat(struct file *file,
835 unsigned int cmd, unsigned long arg)
52658bb6 836{
3a51f7c4 837 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1da177e4 838}
52658bb6 839#endif
1da177e4 840
66e66118 841static const struct file_operations evdev_fops = {
6addb1d6
DT
842 .owner = THIS_MODULE,
843 .read = evdev_read,
844 .write = evdev_write,
845 .poll = evdev_poll,
846 .open = evdev_open,
847 .release = evdev_release,
848 .unlocked_ioctl = evdev_ioctl,
52658bb6 849#ifdef CONFIG_COMPAT
6addb1d6 850 .compat_ioctl = evdev_ioctl_compat,
52658bb6 851#endif
6addb1d6 852 .fasync = evdev_fasync,
6038f373
AB
853 .flush = evdev_flush,
854 .llseek = no_llseek,
1da177e4
LT
855};
856
6addb1d6
DT
857static int evdev_install_chrdev(struct evdev *evdev)
858{
859 /*
860 * No need to do any locking here as calls to connect and
861 * disconnect are serialized by the input core
862 */
863 evdev_table[evdev->minor] = evdev;
864 return 0;
865}
866
867static void evdev_remove_chrdev(struct evdev *evdev)
868{
869 /*
870 * Lock evdev table to prevent race with evdev_open()
871 */
872 mutex_lock(&evdev_table_mutex);
873 evdev_table[evdev->minor] = NULL;
874 mutex_unlock(&evdev_table_mutex);
875}
876
877/*
878 * Mark device non-existent. This disables writes, ioctls and
879 * prevents new users from opening the device. Already posted
880 * blocking reads will stay, however new ones will fail.
881 */
882static void evdev_mark_dead(struct evdev *evdev)
883{
884 mutex_lock(&evdev->mutex);
20da92de 885 evdev->exist = false;
6addb1d6
DT
886 mutex_unlock(&evdev->mutex);
887}
888
889static void evdev_cleanup(struct evdev *evdev)
890{
891 struct input_handle *handle = &evdev->handle;
892
893 evdev_mark_dead(evdev);
894 evdev_hangup(evdev);
895 evdev_remove_chrdev(evdev);
896
897 /* evdev is marked dead so no one else accesses evdev->open */
898 if (evdev->open) {
899 input_flush_device(handle, NULL);
900 input_close_device(handle);
901 }
902}
903
904/*
905 * Create new evdev device. Note that input core serializes calls
906 * to connect and disconnect so we don't need to lock evdev_table here.
907 */
5b2a0826
DT
908static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
909 const struct input_device_id *id)
1da177e4
LT
910{
911 struct evdev *evdev;
912 int minor;
5b2a0826 913 int error;
1da177e4 914
6addb1d6
DT
915 for (minor = 0; minor < EVDEV_MINORS; minor++)
916 if (!evdev_table[minor])
917 break;
918
1da177e4 919 if (minor == EVDEV_MINORS) {
da0c4901 920 pr_err("no more free evdev devices\n");
5b2a0826 921 return -ENFILE;
1da177e4
LT
922 }
923
5b2a0826
DT
924 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
925 if (!evdev)
926 return -ENOMEM;
1da177e4 927
d0ffb9be 928 INIT_LIST_HEAD(&evdev->client_list);
6addb1d6
DT
929 spin_lock_init(&evdev->client_lock);
930 mutex_init(&evdev->mutex);
1da177e4
LT
931 init_waitqueue_head(&evdev->wait);
932
3d5cb60e 933 dev_set_name(&evdev->dev, "event%d", minor);
20da92de 934 evdev->exist = true;
1da177e4 935 evdev->minor = minor;
6addb1d6 936
a7097ff8 937 evdev->handle.dev = input_get_device(dev);
3d5cb60e 938 evdev->handle.name = dev_name(&evdev->dev);
1da177e4
LT
939 evdev->handle.handler = handler;
940 evdev->handle.private = evdev;
1da177e4 941
6addb1d6 942 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
9657d75c
DT
943 evdev->dev.class = &input_class;
944 evdev->dev.parent = &dev->dev;
9657d75c
DT
945 evdev->dev.release = evdev_free;
946 device_initialize(&evdev->dev);
5b2a0826 947
6addb1d6 948 error = input_register_handle(&evdev->handle);
5b2a0826 949 if (error)
9657d75c 950 goto err_free_evdev;
5b2a0826 951
6addb1d6
DT
952 error = evdev_install_chrdev(evdev);
953 if (error)
954 goto err_unregister_handle;
955
956 error = device_add(&evdev->dev);
5b2a0826 957 if (error)
6addb1d6 958 goto err_cleanup_evdev;
1da177e4 959
5b2a0826 960 return 0;
1da177e4 961
6addb1d6
DT
962 err_cleanup_evdev:
963 evdev_cleanup(evdev);
964 err_unregister_handle:
965 input_unregister_handle(&evdev->handle);
5b2a0826 966 err_free_evdev:
9657d75c 967 put_device(&evdev->dev);
5b2a0826 968 return error;
1da177e4
LT
969}
970
971static void evdev_disconnect(struct input_handle *handle)
972{
973 struct evdev *evdev = handle->private;
1da177e4 974
9657d75c 975 device_del(&evdev->dev);
6addb1d6
DT
976 evdev_cleanup(evdev);
977 input_unregister_handle(handle);
9657d75c 978 put_device(&evdev->dev);
1da177e4
LT
979}
980
66e66118 981static const struct input_device_id evdev_ids[] = {
1da177e4
LT
982 { .driver_info = 1 }, /* Matches all devices */
983 { }, /* Terminating zero entry */
984};
985
986MODULE_DEVICE_TABLE(input, evdev_ids);
987
988static struct input_handler evdev_handler = {
6addb1d6
DT
989 .event = evdev_event,
990 .connect = evdev_connect,
991 .disconnect = evdev_disconnect,
992 .fops = &evdev_fops,
993 .minor = EVDEV_MINOR_BASE,
994 .name = "evdev",
995 .id_table = evdev_ids,
1da177e4
LT
996};
997
998static int __init evdev_init(void)
999{
4263cf0f 1000 return input_register_handler(&evdev_handler);
1da177e4
LT
1001}
1002
1003static void __exit evdev_exit(void)
1004{
1005 input_unregister_handler(&evdev_handler);
1006}
1007
1008module_init(evdev_init);
1009module_exit(evdev_exit);
1010
1011MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
1012MODULE_DESCRIPTION("Input driver event char devices");
1013MODULE_LICENSE("GPL");