blob: 2ee6c7a68bdccf4c9cf6c330f824d341f0a69302 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040016#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/slab.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/input.h>
21#include <linux/major.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/device.h>
Philip Langdale2d56f3a2008-10-16 22:31:42 -040023#include "input-compat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25struct evdev {
26 int exist;
27 int open;
28 int minor;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 struct input_handle handle;
30 wait_queue_head_t wait;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040031 struct evdev_client *grab;
32 struct list_head client_list;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040033 spinlock_t client_lock; /* protects client_list */
34 struct mutex mutex;
Dmitry Torokhov9657d752007-06-14 23:32:24 -040035 struct device dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036};
37
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040038struct evdev_client {
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 struct input_event buffer[EVDEV_BUFFER_SIZE];
40 int head;
41 int tail;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040042 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 struct fasync_struct *fasync;
44 struct evdev *evdev;
45 struct list_head node;
46};
47
48static struct evdev *evdev_table[EVDEV_MINORS];
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040049static DEFINE_MUTEX(evdev_table_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040051static 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
Adam Jackson30a589f2010-01-05 17:56:04 -080062 if (event->type == EV_SYN)
63 kill_fasync(&client->fasync, SIGIO, POLL_IN);
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040064}
65
66/*
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040067 * Pass incoming event to all connected clients.
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040068 */
69static void evdev_event(struct input_handle *handle,
70 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
72 struct evdev *evdev = handle->private;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040073 struct evdev_client *client;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040074 struct input_event event;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040076 do_gettimeofday(&event.time);
77 event.type = type;
78 event.code = code;
79 event.value = value;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040081 rcu_read_lock();
82
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -040083 client = rcu_dereference(evdev->grab);
84 if (client)
85 evdev_pass_event(client, &event);
86 else
87 list_for_each_entry_rcu(client, &evdev->client_list, node)
88 evdev_pass_event(client, &event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040090 rcu_read_unlock();
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 wake_up_interruptible(&evdev->wait);
93}
94
95static int evdev_fasync(int fd, struct file *file, int on)
96{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -040097 struct evdev_client *client = file->private_data;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -040098
Jonathan Corbet60aa4922009-02-01 14:52:56 -070099 return fasync_helper(fd, file, on, &client->fasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
101
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400102static int evdev_flush(struct file *file, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400104 struct evdev_client *client = file->private_data;
105 struct evdev *evdev = client->evdev;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400106 int retval;
107
108 retval = mutex_lock_interruptible(&evdev->mutex);
109 if (retval)
110 return retval;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400111
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400112 if (!evdev->exist)
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400113 retval = -ENODEV;
114 else
115 retval = input_flush_device(&evdev->handle, file);
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400116
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400117 mutex_unlock(&evdev->mutex);
118 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400121static void evdev_free(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400123 struct evdev *evdev = container_of(dev, struct evdev, dev);
124
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400125 input_put_device(evdev->handle.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 kfree(evdev);
127}
128
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400129/*
130 * Grabs an event device (along with underlying input device).
131 * This function is called with evdev->mutex taken.
132 */
133static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
134{
135 int error;
136
137 if (evdev->grab)
138 return -EBUSY;
139
140 error = input_grab_device(&evdev->handle);
141 if (error)
142 return error;
143
144 rcu_assign_pointer(evdev->grab, client);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400145 synchronize_rcu();
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400146
147 return 0;
148}
149
150static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
151{
152 if (evdev->grab != client)
153 return -EINVAL;
154
155 rcu_assign_pointer(evdev->grab, NULL);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400156 synchronize_rcu();
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400157 input_release_device(&evdev->handle);
158
159 return 0;
160}
161
162static void evdev_attach_client(struct evdev *evdev,
163 struct evdev_client *client)
164{
165 spin_lock(&evdev->client_lock);
166 list_add_tail_rcu(&client->node, &evdev->client_list);
167 spin_unlock(&evdev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400168 synchronize_rcu();
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400169}
170
171static void evdev_detach_client(struct evdev *evdev,
172 struct evdev_client *client)
173{
174 spin_lock(&evdev->client_lock);
175 list_del_rcu(&client->node);
176 spin_unlock(&evdev->client_lock);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400177 synchronize_rcu();
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400178}
179
180static int evdev_open_device(struct evdev *evdev)
181{
182 int retval;
183
184 retval = mutex_lock_interruptible(&evdev->mutex);
185 if (retval)
186 return retval;
187
188 if (!evdev->exist)
189 retval = -ENODEV;
Oliver Neukum06445012007-10-12 14:18:40 -0400190 else if (!evdev->open++) {
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400191 retval = input_open_device(&evdev->handle);
Oliver Neukum06445012007-10-12 14:18:40 -0400192 if (retval)
193 evdev->open--;
194 }
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400195
196 mutex_unlock(&evdev->mutex);
197 return retval;
198}
199
200static void evdev_close_device(struct evdev *evdev)
201{
202 mutex_lock(&evdev->mutex);
203
204 if (evdev->exist && !--evdev->open)
205 input_close_device(&evdev->handle);
206
207 mutex_unlock(&evdev->mutex);
208}
209
210/*
211 * Wake up users waiting for IO so they can disconnect from
212 * dead device.
213 */
214static void evdev_hangup(struct evdev *evdev)
215{
216 struct evdev_client *client;
217
218 spin_lock(&evdev->client_lock);
219 list_for_each_entry(client, &evdev->client_list, node)
220 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
221 spin_unlock(&evdev->client_lock);
222
223 wake_up_interruptible(&evdev->wait);
224}
225
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400226static int evdev_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400228 struct evdev_client *client = file->private_data;
229 struct evdev *evdev = client->evdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400231 mutex_lock(&evdev->mutex);
232 if (evdev->grab == client)
233 evdev_ungrab(evdev, client);
234 mutex_unlock(&evdev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400236 evdev_detach_client(evdev, client);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400237 kfree(client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400239 evdev_close_device(evdev);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400240 put_device(&evdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return 0;
243}
244
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400245static int evdev_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400247 struct evdev *evdev;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400248 struct evdev_client *client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 int i = iminor(inode) - EVDEV_MINOR_BASE;
Dmitry Torokhovd542ed82007-04-12 01:30:15 -0400250 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400252 if (i >= EVDEV_MINORS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 return -ENODEV;
254
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400255 error = mutex_lock_interruptible(&evdev_table_mutex);
256 if (error)
257 return error;
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400258 evdev = evdev_table[i];
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400259 if (evdev)
260 get_device(&evdev->dev);
261 mutex_unlock(&evdev_table_mutex);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400262
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400263 if (!evdev)
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400264 return -ENODEV;
265
266 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400267 if (!client) {
268 error = -ENOMEM;
269 goto err_put_evdev;
270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400272 spin_lock_init(&client->buffer_lock);
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400273 client->evdev = evdev;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400274 evdev_attach_client(evdev, client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400276 error = evdev_open_device(evdev);
277 if (error)
278 goto err_free_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400280 file->private_data = client;
Dmitry Torokhov3d7bbd42010-02-04 00:30:42 -0800281 nonseekable_open(inode, file);
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return 0;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400284
285 err_free_client:
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400286 evdev_detach_client(evdev, client);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400287 kfree(client);
288 err_put_evdev:
289 put_device(&evdev->dev);
290 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400293static ssize_t evdev_write(struct file *file, const char __user *buffer,
294 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400296 struct evdev_client *client = file->private_data;
297 struct evdev *evdev = client->evdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 struct input_event event;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400299 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400301 retval = mutex_lock_interruptible(&evdev->mutex);
302 if (retval)
303 return retval;
304
305 if (!evdev->exist) {
306 retval = -ENODEV;
307 goto out;
308 }
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500309
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500310 while (retval < count) {
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500311
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400312 if (input_event_from_user(buffer + retval, &event)) {
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400313 retval = -EFAULT;
314 goto out;
315 }
316
317 input_inject_event(&evdev->handle,
318 event.type, event.code, event.value);
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400319 retval += input_event_size();
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500320 }
321
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400322 out:
323 mutex_unlock(&evdev->mutex);
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500324 return retval;
325}
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500326
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400327static 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400348 struct evdev_client *client = file->private_data;
349 struct evdev *evdev = client->evdev;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400350 struct input_event event;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 int retval;
352
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400353 if (count < input_event_size())
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return -EINVAL;
355
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400356 if (client->head == client->tail && evdev->exist &&
357 (file->f_flags & O_NONBLOCK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return -EAGAIN;
359
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400360 retval = wait_event_interruptible(evdev->wait,
361 client->head != client->tail || !evdev->exist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 if (retval)
363 return retval;
364
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400365 if (!evdev->exist)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 return -ENODEV;
367
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400368 while (retval + input_event_size() <= count &&
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400369 evdev_fetch_next_event(client, &event)) {
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500370
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400371 if (input_event_to_user(buffer + retval, &event))
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500372 return -EFAULT;
373
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400374 retval += input_event_size();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
376
377 return retval;
378}
379
380/* No kernel lock - fine */
381static unsigned int evdev_poll(struct file *file, poll_table *wait)
382{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400383 struct evdev_client *client = file->private_data;
384 struct evdev *evdev = client->evdev;
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400385
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400386 poll_wait(file, &evdev->wait, wait);
387 return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
388 (evdev->exist ? 0 : (POLLHUP | POLLERR));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389}
390
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500391#ifdef CONFIG_COMPAT
392
393#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700394#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500395
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) {
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700403 len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
Kenichi Nagaibf61f8d2007-05-11 01:12:15 -0400404 if (len > maxlen)
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500405 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 {
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700414 len = BITS_TO_LONGS(maxbit) * sizeof(long);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500415 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 ?
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700429 BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
430 BITS_TO_LONGS(maxbit) * sizeof(long);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500431
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{
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700444 int len = BITS_TO_LONGS(maxbit) * sizeof(long);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500445
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
Dmitry Torokhovf2afa772008-08-08 11:46:53 -0400468#define OLD_KEY_MAX 0x1ff
Linus Torvalds5402a732008-08-05 11:42:42 -0400469static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode)
470{
Dmitry Torokhovf2afa772008-08-08 11:46:53 -0400471 static unsigned long keymax_warn_time;
Linus Torvalds5402a732008-08-05 11:42:42 -0400472 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 }
Dmitry Torokhovf2afa772008-08-08 11:46:53 -0400488
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
Geert Uytterhoevenc85e2032008-08-19 11:28:23 -0400498 "evdev.c(EVIOCGBIT): Suspicious buffer size %u, "
499 "limiting output to %zu bytes. See "
Dmitry Torokhovf2afa772008-08-08 11:46:53 -0400500 "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
501 OLD_KEY_MAX,
502 BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
503 }
504
Linus Torvalds5402a732008-08-05 11:42:42 -0400505 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
506}
Dmitry Torokhovf2afa772008-08-08 11:46:53 -0400507#undef OLD_KEY_MAX
Linus Torvalds5402a732008-08-05 11:42:42 -0400508
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400509static long evdev_do_ioctl(struct file *file, unsigned int cmd,
510 void __user *p, int compat_mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511{
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400512 struct evdev_client *client = file->private_data;
513 struct evdev *evdev = client->evdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 struct input_dev *dev = evdev->handle.dev;
515 struct input_absinfo abs;
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400516 struct ff_effect effect;
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500517 int __user *ip = (int __user *)p;
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800518 unsigned int i, t, u, v;
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400519 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 switch (cmd) {
522
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400523 case EVIOCGVERSION:
524 return put_user(EV_VERSION, ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400526 case EVIOCGID:
527 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
528 return -EFAULT;
529 return 0;
Dmitry Torokhov08791e52006-04-29 01:13:21 -0400530
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400531 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;
Dmitry Torokhov08791e52006-04-29 01:13:21 -0400539
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400540 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;
Dmitry Torokhov08791e52006-04-29 01:13:21 -0400547
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400548 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
549 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500550
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400551 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400553 case EVIOCGKEYCODE:
554 if (get_user(t, ip))
555 return -EFAULT;
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400556
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400557 error = input_get_keycode(dev, t, &v);
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400558 if (error)
Anssi Hannula509ca1a2006-07-19 01:40:22 -0400559 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400561 if (put_user(v, ip + 1))
562 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400564 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400566 case EVIOCSKEYCODE:
567 if (get_user(t, ip) || get_user(v, ip + 1))
568 return -EFAULT;
569
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400570 return input_set_keycode(dev, t, v);
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400571
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400572 case EVIOCRMFF:
573 return input_ff_erase(dev, (int)(unsigned long) p, file);
574
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);
587
588 default:
589
590 if (_IOC_TYPE(cmd) != 'E')
591 return -EINVAL;
592
593 if (_IOC_DIR(cmd) == _IOC_READ) {
594
Linus Torvalds5402a732008-08-05 11:42:42 -0400595 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
596 return handle_eviocgbit(dev, cmd, p, compat_mode);
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400597
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);
601
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);
605
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);
609
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);
613
614 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
Daniel Mackf9366012009-07-13 22:22:49 -0700615 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400616
617 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
618 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
619
620 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
621 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
622
623 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
624
625 t = _IOC_NR(cmd) & ABS_MAX;
626
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];
Tero Saarniec20a022009-06-10 23:27:24 -0700632 abs.resolution = dev->absres[t];
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400633
Tero Saarniec20a022009-06-10 23:27:24 -0700634 if (copy_to_user(p, &abs, min_t(size_t,
635 _IOC_SIZE(cmd),
636 sizeof(struct input_absinfo))))
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400637 return -EFAULT;
638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 return 0;
640 }
641
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400642 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400644 if (_IOC_DIR(cmd) == _IOC_WRITE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Adam Dawidowskif2278f32008-06-02 01:08:10 -0400646 if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
647
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400648 if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
Adam Dawidowskif2278f32008-06-02 01:08:10 -0400649 return -EFAULT;
650
651 error = input_ff_upload(dev, &effect, file);
652
653 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
654 return -EFAULT;
655
656 return error;
657 }
658
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400659 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400661 t = _IOC_NR(cmd) & ABS_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Tero Saarniec20a022009-06-10 23:27:24 -0700663 if (copy_from_user(&abs, p, min_t(size_t,
664 _IOC_SIZE(cmd),
665 sizeof(struct input_absinfo))))
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400666 return -EFAULT;
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500667
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400668 /*
669 * Take event lock to ensure that we are not
670 * changing device parameters in the middle
671 * of event.
672 */
673 spin_lock_irq(&dev->event_lock);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500674
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400675 dev->abs[t] = abs.value;
676 dev->absmin[t] = abs.minimum;
677 dev->absmax[t] = abs.maximum;
678 dev->absfuzz[t] = abs.fuzz;
679 dev->absflat[t] = abs.flat;
Tero Saarniec20a022009-06-10 23:27:24 -0700680 dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
681 0 : abs.resolution;
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500682
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400683 spin_unlock_irq(&dev->event_lock);
Vojtech Pavlik41e979f2005-05-29 02:30:15 -0500684
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400685 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 }
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400687 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 }
689 return -EINVAL;
690}
691
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400692static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
693 void __user *p, int compat_mode)
694{
695 struct evdev_client *client = file->private_data;
696 struct evdev *evdev = client->evdev;
697 int retval;
698
699 retval = mutex_lock_interruptible(&evdev->mutex);
700 if (retval)
701 return retval;
702
703 if (!evdev->exist) {
704 retval = -ENODEV;
705 goto out;
706 }
707
708 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
709
710 out:
711 mutex_unlock(&evdev->mutex);
712 return retval;
713}
714
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500715static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
716{
717 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
718}
719
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500720#ifdef CONFIG_COMPAT
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400721static long evdev_ioctl_compat(struct file *file,
722 unsigned int cmd, unsigned long arg)
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500723{
Dmitry Torokhov3a51f7c2005-12-11 12:40:37 -0500724 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500725}
726#endif
727
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400728static const struct file_operations evdev_fops = {
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400729 .owner = THIS_MODULE,
730 .read = evdev_read,
731 .write = evdev_write,
732 .poll = evdev_poll,
733 .open = evdev_open,
734 .release = evdev_release,
735 .unlocked_ioctl = evdev_ioctl,
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500736#ifdef CONFIG_COMPAT
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400737 .compat_ioctl = evdev_ioctl_compat,
Juergen Kreileder52658bb2005-05-29 02:26:43 -0500738#endif
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400739 .fasync = evdev_fasync,
740 .flush = evdev_flush
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741};
742
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400743static int evdev_install_chrdev(struct evdev *evdev)
744{
745 /*
746 * No need to do any locking here as calls to connect and
747 * disconnect are serialized by the input core
748 */
749 evdev_table[evdev->minor] = evdev;
750 return 0;
751}
752
753static void evdev_remove_chrdev(struct evdev *evdev)
754{
755 /*
756 * Lock evdev table to prevent race with evdev_open()
757 */
758 mutex_lock(&evdev_table_mutex);
759 evdev_table[evdev->minor] = NULL;
760 mutex_unlock(&evdev_table_mutex);
761}
762
763/*
764 * Mark device non-existent. This disables writes, ioctls and
765 * prevents new users from opening the device. Already posted
766 * blocking reads will stay, however new ones will fail.
767 */
768static void evdev_mark_dead(struct evdev *evdev)
769{
770 mutex_lock(&evdev->mutex);
771 evdev->exist = 0;
772 mutex_unlock(&evdev->mutex);
773}
774
775static void evdev_cleanup(struct evdev *evdev)
776{
777 struct input_handle *handle = &evdev->handle;
778
779 evdev_mark_dead(evdev);
780 evdev_hangup(evdev);
781 evdev_remove_chrdev(evdev);
782
783 /* evdev is marked dead so no one else accesses evdev->open */
784 if (evdev->open) {
785 input_flush_device(handle, NULL);
786 input_close_device(handle);
787 }
788}
789
790/*
791 * Create new evdev device. Note that input core serializes calls
792 * to connect and disconnect so we don't need to lock evdev_table here.
793 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400794static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
795 const struct input_device_id *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796{
797 struct evdev *evdev;
798 int minor;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400799 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400801 for (minor = 0; minor < EVDEV_MINORS; minor++)
802 if (!evdev_table[minor])
803 break;
804
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 if (minor == EVDEV_MINORS) {
806 printk(KERN_ERR "evdev: no more free evdev devices\n");
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400807 return -ENFILE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 }
809
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400810 evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
811 if (!evdev)
812 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
Dmitry Torokhovd0ffb9b2007-04-12 01:30:00 -0400814 INIT_LIST_HEAD(&evdev->client_list);
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400815 spin_lock_init(&evdev->client_lock);
816 mutex_init(&evdev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 init_waitqueue_head(&evdev->wait);
818
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700819 dev_set_name(&evdev->dev, "event%d", minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 evdev->exist = 1;
821 evdev->minor = minor;
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400822
Dmitry Torokhova7097ff2008-04-01 00:22:53 -0400823 evdev->handle.dev = input_get_device(dev);
Thadeu Lima de Souza Cascardo3d5cb602009-05-09 16:08:04 -0700824 evdev->handle.name = dev_name(&evdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 evdev->handle.handler = handler;
826 evdev->handle.private = evdev;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400827
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400828 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400829 evdev->dev.class = &input_class;
830 evdev->dev.parent = &dev->dev;
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400831 evdev->dev.release = evdev_free;
832 device_initialize(&evdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400834 error = input_register_handle(&evdev->handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400835 if (error)
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400836 goto err_free_evdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400838 error = evdev_install_chrdev(evdev);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400839 if (error)
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400840 goto err_unregister_handle;
841
842 error = device_add(&evdev->dev);
843 if (error)
844 goto err_cleanup_evdev;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400845
846 return 0;
847
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400848 err_cleanup_evdev:
849 evdev_cleanup(evdev);
850 err_unregister_handle:
851 input_unregister_handle(&evdev->handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400852 err_free_evdev:
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400853 put_device(&evdev->dev);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400854 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855}
856
857static void evdev_disconnect(struct input_handle *handle)
858{
859 struct evdev *evdev = handle->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400861 device_del(&evdev->dev);
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400862 evdev_cleanup(evdev);
863 input_unregister_handle(handle);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400864 put_device(&evdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865}
866
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400867static const struct input_device_id evdev_ids[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 { .driver_info = 1 }, /* Matches all devices */
869 { }, /* Terminating zero entry */
870};
871
872MODULE_DEVICE_TABLE(input, evdev_ids);
873
874static struct input_handler evdev_handler = {
Dmitry Torokhov6addb1d2007-08-30 00:22:18 -0400875 .event = evdev_event,
876 .connect = evdev_connect,
877 .disconnect = evdev_disconnect,
878 .fops = &evdev_fops,
879 .minor = EVDEV_MINOR_BASE,
880 .name = "evdev",
881 .id_table = evdev_ids,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882};
883
884static int __init evdev_init(void)
885{
Dmitry Torokhov4263cf02006-09-14 01:32:39 -0400886 return input_register_handler(&evdev_handler);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
889static void __exit evdev_exit(void)
890{
891 input_unregister_handler(&evdev_handler);
892}
893
894module_init(evdev_init);
895module_exit(evdev_exit);
896
897MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
898MODULE_DESCRIPTION("Input driver event char devices");
899MODULE_LICENSE("GPL");