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Move FASYNC bit handling to f_op->fasync()
[mirror_ubuntu-artful-kernel.git] / drivers / input / evdev.c
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
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>
1da177e4 21#include <linux/device.h>
2d56f3a3 22#include "input-compat.h"
1da177e4
LT
23
24struct 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;
d0ffb9be
DT
31 struct evdev_client *grab;
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;
1da177e4
LT
36};
37
d0ffb9be 38struct evdev_client {
1da177e4
LT
39 struct input_event buffer[EVDEV_BUFFER_SIZE];
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;
46};
47
48static struct evdev *evdev_table[EVDEV_MINORS];
6addb1d6 49static DEFINE_MUTEX(evdev_table_mutex);
1da177e4 50
6addb1d6
DT
51static 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/*
82ba56c2 66 * Pass incoming event to all connected clients.
6addb1d6
DT
67 */
68static void evdev_event(struct input_handle *handle,
69 unsigned int type, unsigned int code, int value)
1da177e4
LT
70{
71 struct evdev *evdev = handle->private;
d0ffb9be 72 struct evdev_client *client;
6addb1d6 73 struct input_event event;
1da177e4 74
6addb1d6
DT
75 do_gettimeofday(&event.time);
76 event.type = type;
77 event.code = code;
78 event.value = value;
1da177e4 79
82ba56c2
DT
80 rcu_read_lock();
81
6addb1d6
DT
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);
1da177e4 88
82ba56c2
DT
89 rcu_read_unlock();
90
1da177e4
LT
91 wake_up_interruptible(&evdev->wait);
92}
93
94static int evdev_fasync(int fd, struct file *file, int on)
95{
d0ffb9be 96 struct evdev_client *client = file->private_data;
1da177e4 97 int retval;
1e0afb28 98
d0ffb9be 99 retval = fasync_helper(fd, file, on, &client->fasync);
1e0afb28 100
1da177e4
LT
101 return retval < 0 ? retval : 0;
102}
103
1e0afb28 104static int evdev_flush(struct file *file, fl_owner_t id)
1da177e4 105{
d0ffb9be
DT
106 struct evdev_client *client = file->private_data;
107 struct evdev *evdev = client->evdev;
6addb1d6
DT
108 int retval;
109
110 retval = mutex_lock_interruptible(&evdev->mutex);
111 if (retval)
112 return retval;
1e0afb28 113
d0ffb9be 114 if (!evdev->exist)
6addb1d6
DT
115 retval = -ENODEV;
116 else
117 retval = input_flush_device(&evdev->handle, file);
1e0afb28 118
6addb1d6
DT
119 mutex_unlock(&evdev->mutex);
120 return retval;
1da177e4
LT
121}
122
9657d75c 123static void evdev_free(struct device *dev)
1da177e4 124{
9657d75c
DT
125 struct evdev *evdev = container_of(dev, struct evdev, dev);
126
a7097ff8 127 input_put_device(evdev->handle.dev);
1da177e4
LT
128 kfree(evdev);
129}
130
6addb1d6
DT
131/*
132 * Grabs an event device (along with underlying input device).
133 * This function is called with evdev->mutex taken.
134 */
135static 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);
82ba56c2 147 synchronize_rcu();
6addb1d6
DT
148
149 return 0;
150}
151
152static 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);
82ba56c2 158 synchronize_rcu();
6addb1d6
DT
159 input_release_device(&evdev->handle);
160
161 return 0;
162}
163
164static 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);
82ba56c2 170 synchronize_rcu();
6addb1d6
DT
171}
172
173static 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);
82ba56c2 179 synchronize_rcu();
6addb1d6
DT
180}
181
182static 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;
06445014 192 else if (!evdev->open++) {
6addb1d6 193 retval = input_open_device(&evdev->handle);
06445014
ON
194 if (retval)
195 evdev->open--;
196 }
6addb1d6
DT
197
198 mutex_unlock(&evdev->mutex);
199 return retval;
200}
201
202static 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 */
216static 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
d0ffb9be 228static int evdev_release(struct inode *inode, struct file *file)
1da177e4 229{
d0ffb9be
DT
230 struct evdev_client *client = file->private_data;
231 struct evdev *evdev = client->evdev;
1da177e4 232
6addb1d6
DT
233 mutex_lock(&evdev->mutex);
234 if (evdev->grab == client)
235 evdev_ungrab(evdev, client);
236 mutex_unlock(&evdev->mutex);
1da177e4 237
6addb1d6 238 evdev_detach_client(evdev, client);
d0ffb9be 239 kfree(client);
1da177e4 240
6addb1d6 241 evdev_close_device(evdev);
9657d75c 242 put_device(&evdev->dev);
1da177e4 243
1da177e4
LT
244 return 0;
245}
246
d0ffb9be 247static int evdev_open(struct inode *inode, struct file *file)
1da177e4 248{
d0ffb9be 249 struct evdev *evdev;
6addb1d6 250 struct evdev_client *client;
1da177e4 251 int i = iminor(inode) - EVDEV_MINOR_BASE;
d542ed82 252 int error;
1da177e4 253
d0ffb9be 254 if (i >= EVDEV_MINORS)
1da177e4
LT
255 return -ENODEV;
256
6addb1d6
DT
257 error = mutex_lock_interruptible(&evdev_table_mutex);
258 if (error)
259 return error;
d0ffb9be 260 evdev = evdev_table[i];
6addb1d6
DT
261 if (evdev)
262 get_device(&evdev->dev);
263 mutex_unlock(&evdev_table_mutex);
d0ffb9be 264
6addb1d6 265 if (!evdev)
1da177e4
LT
266 return -ENODEV;
267
d0ffb9be 268 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
9657d75c
DT
269 if (!client) {
270 error = -ENOMEM;
271 goto err_put_evdev;
272 }
1da177e4 273
6addb1d6 274 spin_lock_init(&client->buffer_lock);
d0ffb9be 275 client->evdev = evdev;
6addb1d6 276 evdev_attach_client(evdev, client);
1da177e4 277
6addb1d6
DT
278 error = evdev_open_device(evdev);
279 if (error)
280 goto err_free_client;
1da177e4 281
d0ffb9be 282 file->private_data = client;
1da177e4 283 return 0;
9657d75c
DT
284
285 err_free_client:
6addb1d6 286 evdev_detach_client(evdev, client);
9657d75c
DT
287 kfree(client);
288 err_put_evdev:
289 put_device(&evdev->dev);
290 return error;
1da177e4
LT
291}
292
6addb1d6
DT
293static ssize_t evdev_write(struct file *file, const char __user *buffer,
294 size_t count, loff_t *ppos)
3a51f7c4 295{
d0ffb9be
DT
296 struct evdev_client *client = file->private_data;
297 struct evdev *evdev = client->evdev;
3a51f7c4 298 struct input_event event;
6addb1d6 299 int retval;
52658bb6 300
6addb1d6
DT
301 retval = mutex_lock_interruptible(&evdev->mutex);
302 if (retval)
303 return retval;
304
305 if (!evdev->exist) {
306 retval = -ENODEV;
307 goto out;
308 }
52658bb6 309
3a51f7c4
DT
310 while (retval < count) {
311
2d56f3a3 312 if (input_event_from_user(buffer + retval, &event)) {
6addb1d6
DT
313 retval = -EFAULT;
314 goto out;
315 }
316
317 input_inject_event(&evdev->handle,
318 event.type, event.code, event.value);
2d56f3a3 319 retval += input_event_size();
52658bb6
JK
320 }
321
6addb1d6
DT
322 out:
323 mutex_unlock(&evdev->mutex);
52658bb6
JK
324 return retval;
325}
52658bb6 326
6addb1d6
DT
327static int evdev_fetch_next_event(struct evdev_client *client,
328 struct input_event *event)
329{
330 int have_event;
331
332 spin_lock_irq(&client->buffer_lock);
333
334 have_event = client->head != client->tail;
335 if (have_event) {
336 *event = client->buffer[client->tail++];
337 client->tail &= EVDEV_BUFFER_SIZE - 1;
338 }
339
340 spin_unlock_irq(&client->buffer_lock);
341
342 return have_event;
343}
344
345static ssize_t evdev_read(struct file *file, char __user *buffer,
346 size_t count, loff_t *ppos)
1da177e4 347{
d0ffb9be
DT
348 struct evdev_client *client = file->private_data;
349 struct evdev *evdev = client->evdev;
6addb1d6 350 struct input_event event;
1da177e4
LT
351 int retval;
352
2d56f3a3 353 if (count < input_event_size())
1da177e4
LT
354 return -EINVAL;
355
6addb1d6
DT
356 if (client->head == client->tail && evdev->exist &&
357 (file->f_flags & O_NONBLOCK))
1da177e4
LT
358 return -EAGAIN;
359
d0ffb9be
DT
360 retval = wait_event_interruptible(evdev->wait,
361 client->head != client->tail || !evdev->exist);
1da177e4
LT
362 if (retval)
363 return retval;
364
d0ffb9be 365 if (!evdev->exist)
1da177e4
LT
366 return -ENODEV;
367
2d56f3a3 368 while (retval + input_event_size() <= count &&
6addb1d6 369 evdev_fetch_next_event(client, &event)) {
3a51f7c4 370
2d56f3a3 371 if (input_event_to_user(buffer + retval, &event))
3a51f7c4
DT
372 return -EFAULT;
373
2d56f3a3 374 retval += input_event_size();
1da177e4
LT
375 }
376
377 return retval;
378}
379
380/* No kernel lock - fine */
381static unsigned int evdev_poll(struct file *file, poll_table *wait)
382{
d0ffb9be
DT
383 struct evdev_client *client = file->private_data;
384 struct evdev *evdev = client->evdev;
1e0afb28 385
d0ffb9be
DT
386 poll_wait(file, &evdev->wait, wait);
387 return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
388 (evdev->exist ? 0 : (POLLHUP | POLLERR));
1da177e4
LT
389}
390
3a51f7c4
DT
391#ifdef CONFIG_COMPAT
392
393#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
7b19ada2 394#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
3a51f7c4
DT
395
396#ifdef __BIG_ENDIAN
397static int bits_to_user(unsigned long *bits, unsigned int maxbit,
398 unsigned int maxlen, void __user *p, int compat)
399{
400 int len, i;
401
402 if (compat) {
7b19ada2 403 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
bf61f8d3 404 if (len > maxlen)
3a51f7c4
DT
405 len = maxlen;
406
407 for (i = 0; i < len / sizeof(compat_long_t); i++)
408 if (copy_to_user((compat_long_t __user *) p + i,
409 (compat_long_t *) bits +
410 i + 1 - ((i % 2) << 1),
411 sizeof(compat_long_t)))
412 return -EFAULT;
413 } else {
7b19ada2 414 len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
415 if (len > maxlen)
416 len = maxlen;
417
418 if (copy_to_user(p, bits, len))
419 return -EFAULT;
420 }
421
422 return len;
423}
424#else
425static int bits_to_user(unsigned long *bits, unsigned int maxbit,
426 unsigned int maxlen, void __user *p, int compat)
427{
428 int len = compat ?
7b19ada2
JS
429 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
430 BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
431
432 if (len > maxlen)
433 len = maxlen;
434
435 return copy_to_user(p, bits, len) ? -EFAULT : len;
436}
437#endif /* __BIG_ENDIAN */
438
439#else
440
441static int bits_to_user(unsigned long *bits, unsigned int maxbit,
442 unsigned int maxlen, void __user *p, int compat)
443{
7b19ada2 444 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
3a51f7c4
DT
445
446 if (len > maxlen)
447 len = maxlen;
448
449 return copy_to_user(p, bits, len) ? -EFAULT : len;
450}
451
452#endif /* CONFIG_COMPAT */
453
454static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
455{
456 int len;
457
458 if (!str)
459 return -ENOENT;
460
461 len = strlen(str) + 1;
462 if (len > maxlen)
463 len = maxlen;
464
465 return copy_to_user(p, str, len) ? -EFAULT : len;
466}
467
f2afa771 468#define OLD_KEY_MAX 0x1ff
5402a734
LT
469static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode)
470{
f2afa771 471 static unsigned long keymax_warn_time;
5402a734
LT
472 unsigned long *bits;
473 int len;
474
475 switch (_IOC_NR(cmd) & EV_MAX) {
476
477 case 0: bits = dev->evbit; len = EV_MAX; break;
478 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
479 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
480 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
481 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
482 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
483 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
484 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
485 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
486 default: return -EINVAL;
487 }
f2afa771
DT
488
489 /*
490 * Work around bugs in userspace programs that like to do
491 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
492 * should be in bytes, not in bits.
493 */
494 if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) {
495 len = OLD_KEY_MAX;
496 if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
497 printk(KERN_WARNING
c85e2031
GU
498 "evdev.c(EVIOCGBIT): Suspicious buffer size %u, "
499 "limiting output to %zu bytes. See "
f2afa771
DT
500 "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
501 OLD_KEY_MAX,
502 BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
503 }
504
5402a734
LT
505 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
506}
f2afa771 507#undef OLD_KEY_MAX
5402a734 508
6addb1d6
DT
509static long evdev_do_ioctl(struct file *file, unsigned int cmd,
510 void __user *p, int compat_mode)
1da177e4 511{
d0ffb9be
DT
512 struct evdev_client *client = file->private_data;
513 struct evdev *evdev = client->evdev;
1da177e4
LT
514 struct input_dev *dev = evdev->handle.dev;
515 struct input_absinfo abs;
509ca1a9 516 struct ff_effect effect;
3a51f7c4 517 int __user *ip = (int __user *)p;
1da177e4 518 int i, t, u, v;
509ca1a9 519 int error;
1da177e4 520
1da177e4
LT
521 switch (cmd) {
522
6addb1d6
DT
523 case EVIOCGVERSION:
524 return put_user(EV_VERSION, ip);
1da177e4 525
6addb1d6
DT
526 case EVIOCGID:
527 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
528 return -EFAULT;
529 return 0;
08791e5c 530
6addb1d6
DT
531 case EVIOCGREP:
532 if (!test_bit(EV_REP, dev->evbit))
533 return -ENOSYS;
534 if (put_user(dev->rep[REP_DELAY], ip))
535 return -EFAULT;
536 if (put_user(dev->rep[REP_PERIOD], ip + 1))
537 return -EFAULT;
538 return 0;
08791e5c 539
6addb1d6
DT
540 case EVIOCSREP:
541 if (!test_bit(EV_REP, dev->evbit))
542 return -ENOSYS;
543 if (get_user(u, ip))
544 return -EFAULT;
545 if (get_user(v, ip + 1))
546 return -EFAULT;
08791e5c 547
6addb1d6
DT
548 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
549 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
3a51f7c4 550
6addb1d6 551 return 0;
1da177e4 552
6addb1d6
DT
553 case EVIOCGKEYCODE:
554 if (get_user(t, ip))
555 return -EFAULT;
c8e4c772 556
f4f37c8e 557 error = input_get_keycode(dev, t, &v);
6addb1d6
DT
558 if (error)
559 return error;
c8e4c772 560
6addb1d6
DT
561 if (put_user(v, ip + 1))
562 return -EFAULT;
c8e4c772 563
6addb1d6 564 return 0;
1da177e4 565
6addb1d6
DT
566 case EVIOCSKEYCODE:
567 if (get_user(t, ip) || get_user(v, ip + 1))
568 return -EFAULT;
3a51f7c4 569
f4f37c8e 570 return input_set_keycode(dev, t, v);
1da177e4 571
6addb1d6
DT
572 case EVIOCRMFF:
573 return input_ff_erase(dev, (int)(unsigned long) p, file);
1da177e4 574
6addb1d6
DT
575 case EVIOCGEFFECTS:
576 i = test_bit(EV_FF, dev->evbit) ?
577 dev->ff->max_effects : 0;
578 if (put_user(i, ip))
579 return -EFAULT;
580 return 0;
581
582 case EVIOCGRAB:
583 if (p)
584 return evdev_grab(evdev, client);
585 else
586 return evdev_ungrab(evdev, client);
1da177e4 587
6addb1d6 588 default:
1da177e4 589
6addb1d6
DT
590 if (_IOC_TYPE(cmd) != 'E')
591 return -EINVAL;
1da177e4 592
6addb1d6 593 if (_IOC_DIR(cmd) == _IOC_READ) {
41e979f8 594
5402a734
LT
595 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
596 return handle_eviocgbit(dev, cmd, p, compat_mode);
1da177e4 597
6addb1d6
DT
598 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
599 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
600 p, compat_mode);
1da177e4 601
6addb1d6
DT
602 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
603 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
604 p, compat_mode);
1da177e4 605
6addb1d6
DT
606 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
607 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
608 p, compat_mode);
31581066 609
6addb1d6
DT
610 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
611 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
612 p, compat_mode);
1da177e4 613
6addb1d6
DT
614 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
615 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
1da177e4 616
6addb1d6
DT
617 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
618 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
1da177e4 619
6addb1d6
DT
620 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
621 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
1da177e4 622
6addb1d6 623 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
1da177e4 624
6addb1d6 625 t = _IOC_NR(cmd) & ABS_MAX;
1da177e4 626
6addb1d6
DT
627 abs.value = dev->abs[t];
628 abs.minimum = dev->absmin[t];
629 abs.maximum = dev->absmax[t];
630 abs.fuzz = dev->absfuzz[t];
631 abs.flat = dev->absflat[t];
41e979f8 632
6addb1d6
DT
633 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
634 return -EFAULT;
1da177e4 635
6addb1d6 636 return 0;
1da177e4
LT
637 }
638
6addb1d6
DT
639 }
640
641 if (_IOC_DIR(cmd) == _IOC_WRITE) {
1da177e4 642
f2278f31
AD
643 if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
644
2d56f3a3 645 if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
f2278f31
AD
646 return -EFAULT;
647
648 error = input_ff_upload(dev, &effect, file);
649
650 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
651 return -EFAULT;
652
653 return error;
654 }
655
6addb1d6 656 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
1da177e4 657
6addb1d6 658 t = _IOC_NR(cmd) & ABS_MAX;
41e979f8 659
6addb1d6
DT
660 if (copy_from_user(&abs, p,
661 sizeof(struct input_absinfo)))
662 return -EFAULT;
1da177e4 663
6addb1d6
DT
664 /*
665 * Take event lock to ensure that we are not
666 * changing device parameters in the middle
667 * of event.
668 */
669 spin_lock_irq(&dev->event_lock);
1da177e4 670
6addb1d6
DT
671 dev->abs[t] = abs.value;
672 dev->absmin[t] = abs.minimum;
673 dev->absmax[t] = abs.maximum;
674 dev->absfuzz[t] = abs.fuzz;
675 dev->absflat[t] = abs.flat;
676
677 spin_unlock_irq(&dev->event_lock);
678
679 return 0;
1da177e4 680 }
6addb1d6 681 }
1da177e4
LT
682 }
683 return -EINVAL;
684}
1da177e4 685
6addb1d6
DT
686static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
687 void __user *p, int compat_mode)
688{
689 struct evdev_client *client = file->private_data;
690 struct evdev *evdev = client->evdev;
691 int retval;
692
693 retval = mutex_lock_interruptible(&evdev->mutex);
694 if (retval)
695 return retval;
696
697 if (!evdev->exist) {
698 retval = -ENODEV;
699 goto out;
700 }
701
702 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
703
704 out:
705 mutex_unlock(&evdev->mutex);
706 return retval;
707}
708
3a51f7c4
DT
709static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
710{
711 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
712}
41e979f8 713
3a51f7c4 714#ifdef CONFIG_COMPAT
6addb1d6
DT
715static long evdev_ioctl_compat(struct file *file,
716 unsigned int cmd, unsigned long arg)
52658bb6 717{
3a51f7c4 718 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
1da177e4 719}
52658bb6 720#endif
1da177e4 721
66e66118 722static const struct file_operations evdev_fops = {
6addb1d6
DT
723 .owner = THIS_MODULE,
724 .read = evdev_read,
725 .write = evdev_write,
726 .poll = evdev_poll,
727 .open = evdev_open,
728 .release = evdev_release,
729 .unlocked_ioctl = evdev_ioctl,
52658bb6 730#ifdef CONFIG_COMPAT
6addb1d6 731 .compat_ioctl = evdev_ioctl_compat,
52658bb6 732#endif
6addb1d6
DT
733 .fasync = evdev_fasync,
734 .flush = evdev_flush
1da177e4
LT
735};
736
6addb1d6
DT
737static int evdev_install_chrdev(struct evdev *evdev)
738{
739 /*
740 * No need to do any locking here as calls to connect and
741 * disconnect are serialized by the input core
742 */
743 evdev_table[evdev->minor] = evdev;
744 return 0;
745}
746
747static void evdev_remove_chrdev(struct evdev *evdev)
748{
749 /*
750 * Lock evdev table to prevent race with evdev_open()
751 */
752 mutex_lock(&evdev_table_mutex);
753 evdev_table[evdev->minor] = NULL;
754 mutex_unlock(&evdev_table_mutex);
755}
756
757/*
758 * Mark device non-existent. This disables writes, ioctls and
759 * prevents new users from opening the device. Already posted
760 * blocking reads will stay, however new ones will fail.
761 */
762static void evdev_mark_dead(struct evdev *evdev)
763{
764 mutex_lock(&evdev->mutex);
765 evdev->exist = 0;
766 mutex_unlock(&evdev->mutex);
767}
768
769static void evdev_cleanup(struct evdev *evdev)
770{
771 struct input_handle *handle = &evdev->handle;
772
773 evdev_mark_dead(evdev);
774 evdev_hangup(evdev);
775 evdev_remove_chrdev(evdev);
776
777 /* evdev is marked dead so no one else accesses evdev->open */
778 if (evdev->open) {
779 input_flush_device(handle, NULL);
780 input_close_device(handle);
781 }
782}
783
784/*
785 * Create new evdev device. Note that input core serializes calls
786 * to connect and disconnect so we don't need to lock evdev_table here.
787 */
5b2a0826
DT
788static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
789 const struct input_device_id *id)
1da177e4
LT
790{
791 struct evdev *evdev;
792 int minor;
5b2a0826 793 int error;
1da177e4 794
6addb1d6
DT
795 for (minor = 0; minor < EVDEV_MINORS; minor++)
796 if (!evdev_table[minor])
797 break;
798
1da177e4
LT
799 if (minor == EVDEV_MINORS) {
800 printk(KERN_ERR "evdev: no more free evdev devices\n");
5b2a0826 801 return -ENFILE;
1da177e4
LT
802 }
803
5b2a0826
DT
804 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
805 if (!evdev)
806 return -ENOMEM;
1da177e4 807
d0ffb9be 808 INIT_LIST_HEAD(&evdev->client_list);
6addb1d6
DT
809 spin_lock_init(&evdev->client_lock);
810 mutex_init(&evdev->mutex);
1da177e4
LT
811 init_waitqueue_head(&evdev->wait);
812
6addb1d6 813 snprintf(evdev->name, sizeof(evdev->name), "event%d", minor);
1da177e4
LT
814 evdev->exist = 1;
815 evdev->minor = minor;
6addb1d6 816
a7097ff8 817 evdev->handle.dev = input_get_device(dev);
1da177e4
LT
818 evdev->handle.name = evdev->name;
819 evdev->handle.handler = handler;
820 evdev->handle.private = evdev;
1da177e4 821
a6c2490f 822 dev_set_name(&evdev->dev, evdev->name);
6addb1d6 823 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
9657d75c
DT
824 evdev->dev.class = &input_class;
825 evdev->dev.parent = &dev->dev;
9657d75c
DT
826 evdev->dev.release = evdev_free;
827 device_initialize(&evdev->dev);
5b2a0826 828
6addb1d6 829 error = input_register_handle(&evdev->handle);
5b2a0826 830 if (error)
9657d75c 831 goto err_free_evdev;
5b2a0826 832
6addb1d6
DT
833 error = evdev_install_chrdev(evdev);
834 if (error)
835 goto err_unregister_handle;
836
837 error = device_add(&evdev->dev);
5b2a0826 838 if (error)
6addb1d6 839 goto err_cleanup_evdev;
1da177e4 840
5b2a0826 841 return 0;
1da177e4 842
6addb1d6
DT
843 err_cleanup_evdev:
844 evdev_cleanup(evdev);
845 err_unregister_handle:
846 input_unregister_handle(&evdev->handle);
5b2a0826 847 err_free_evdev:
9657d75c 848 put_device(&evdev->dev);
5b2a0826 849 return error;
1da177e4
LT
850}
851
852static void evdev_disconnect(struct input_handle *handle)
853{
854 struct evdev *evdev = handle->private;
1da177e4 855
9657d75c 856 device_del(&evdev->dev);
6addb1d6
DT
857 evdev_cleanup(evdev);
858 input_unregister_handle(handle);
9657d75c 859 put_device(&evdev->dev);
1da177e4
LT
860}
861
66e66118 862static const struct input_device_id evdev_ids[] = {
1da177e4
LT
863 { .driver_info = 1 }, /* Matches all devices */
864 { }, /* Terminating zero entry */
865};
866
867MODULE_DEVICE_TABLE(input, evdev_ids);
868
869static struct input_handler evdev_handler = {
6addb1d6
DT
870 .event = evdev_event,
871 .connect = evdev_connect,
872 .disconnect = evdev_disconnect,
873 .fops = &evdev_fops,
874 .minor = EVDEV_MINOR_BASE,
875 .name = "evdev",
876 .id_table = evdev_ids,
1da177e4
LT
877};
878
879static int __init evdev_init(void)
880{
4263cf0f 881 return input_register_handler(&evdev_handler);
1da177e4
LT
882}
883
884static void __exit evdev_exit(void)
885{
886 input_unregister_handler(&evdev_handler);
887}
888
889module_init(evdev_init);
890module_exit(evdev_exit);
891
892MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
893MODULE_DESCRIPTION("Input driver event char devices");
894MODULE_LICENSE("GPL");