Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Joe Perches | da0c490 | 2010-11-29 23:33:07 -0800 | [diff] [blame] | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #define EVDEV_MINOR_BASE 64 |
| 14 | #define EVDEV_MINORS 32 |
Henrik Rydberg | 63a6404 | 2010-06-10 12:05:24 -0700 | [diff] [blame] | 15 | #define EVDEV_MIN_BUFFER_SIZE 64U |
| 16 | #define EVDEV_BUF_PACKETS 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include <linux/poll.h> |
Alexey Dobriyan | a99bbaf | 2009-10-04 16:11:37 +0400 | [diff] [blame] | 19 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/slab.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/init.h> |
Henrik Rydberg | 1cf0c6e | 2012-02-06 08:49:25 +0100 | [diff] [blame] | 23 | #include <linux/input/mt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/major.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/device.h> |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 26 | #include "input-compat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | struct evdev { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | int open; |
| 30 | int minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct input_handle handle; |
| 32 | wait_queue_head_t wait; |
Arnd Bergmann | 2be8527 | 2010-03-04 15:50:28 +0100 | [diff] [blame] | 33 | struct evdev_client __rcu *grab; |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 34 | struct list_head client_list; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 35 | spinlock_t client_lock; /* protects client_list */ |
| 36 | struct mutex mutex; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 37 | struct device dev; |
Dmitry Torokhov | 20da92d | 2010-07-15 23:27:36 -0700 | [diff] [blame] | 38 | bool exist; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | }; |
| 40 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 41 | struct evdev_client { |
Jeff Brown | 9fb0f14 | 2011-04-12 23:29:38 -0700 | [diff] [blame] | 42 | unsigned int head; |
| 43 | unsigned int tail; |
Jeff Brown | cdda911 | 2011-04-26 22:16:11 -0700 | [diff] [blame] | 44 | unsigned int packet_head; /* [future] position of the first element of next packet */ |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 45 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | struct fasync_struct *fasync; |
| 47 | struct evdev *evdev; |
| 48 | struct list_head node; |
John Stultz | a80b83b | 2012-02-03 00:19:07 -0800 | [diff] [blame] | 49 | int clkid; |
Jeff Brown | 9fb0f14 | 2011-04-12 23:29:38 -0700 | [diff] [blame] | 50 | unsigned int bufsize; |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame] | 51 | struct input_event buffer[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | }; |
| 53 | |
| 54 | static struct evdev *evdev_table[EVDEV_MINORS]; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 55 | static DEFINE_MUTEX(evdev_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Henrik Rydberg | a274ac1 | 2012-08-29 20:48:02 +0200 | [diff] [blame] | 57 | static void __pass_event(struct evdev_client *client, |
| 58 | const struct input_event *event) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 59 | { |
Jeff Brown | 9fb0f14 | 2011-04-12 23:29:38 -0700 | [diff] [blame] | 60 | client->buffer[client->head++] = *event; |
| 61 | client->head &= client->bufsize - 1; |
| 62 | |
| 63 | if (unlikely(client->head == client->tail)) { |
| 64 | /* |
| 65 | * This effectively "drops" all unconsumed events, leaving |
| 66 | * EV_SYN/SYN_DROPPED plus the newest event in the queue. |
| 67 | */ |
| 68 | client->tail = (client->head - 2) & (client->bufsize - 1); |
| 69 | |
| 70 | client->buffer[client->tail].time = event->time; |
| 71 | client->buffer[client->tail].type = EV_SYN; |
| 72 | client->buffer[client->tail].code = SYN_DROPPED; |
| 73 | client->buffer[client->tail].value = 0; |
Jeff Brown | cdda911 | 2011-04-26 22:16:11 -0700 | [diff] [blame] | 74 | |
| 75 | client->packet_head = client->tail; |
| 76 | } |
| 77 | |
| 78 | if (event->type == EV_SYN && event->code == SYN_REPORT) { |
| 79 | client->packet_head = client->head; |
| 80 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
Jeff Brown | 9fb0f14 | 2011-04-12 23:29:38 -0700 | [diff] [blame] | 81 | } |
Henrik Rydberg | a274ac1 | 2012-08-29 20:48:02 +0200 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | static void evdev_pass_values(struct evdev_client *client, |
| 85 | const struct input_value *vals, unsigned int count, |
| 86 | ktime_t mono, ktime_t real) |
| 87 | { |
| 88 | struct evdev *evdev = client->evdev; |
| 89 | const struct input_value *v; |
| 90 | struct input_event event; |
| 91 | bool wakeup = false; |
| 92 | |
| 93 | event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ? |
| 94 | mono : real); |
| 95 | |
| 96 | /* Interrupts are disabled, just acquire the lock. */ |
| 97 | spin_lock(&client->buffer_lock); |
| 98 | |
| 99 | for (v = vals; v != vals + count; v++) { |
| 100 | event.type = v->type; |
| 101 | event.code = v->code; |
| 102 | event.value = v->value; |
| 103 | __pass_event(client, &event); |
| 104 | if (v->type == EV_SYN && v->code == SYN_REPORT) |
| 105 | wakeup = true; |
| 106 | } |
Jeff Brown | 9fb0f14 | 2011-04-12 23:29:38 -0700 | [diff] [blame] | 107 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 108 | spin_unlock(&client->buffer_lock); |
Henrik Rydberg | a274ac1 | 2012-08-29 20:48:02 +0200 | [diff] [blame] | 109 | |
| 110 | if (wakeup) |
| 111 | wake_up_interruptible(&evdev->wait); |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Pass incoming events to all connected clients. |
| 116 | */ |
| 117 | static void evdev_events(struct input_handle *handle, |
| 118 | const struct input_value *vals, unsigned int count) |
| 119 | { |
| 120 | struct evdev *evdev = handle->private; |
| 121 | struct evdev_client *client; |
| 122 | ktime_t time_mono, time_real; |
| 123 | |
| 124 | time_mono = ktime_get(); |
| 125 | time_real = ktime_sub(time_mono, ktime_get_monotonic_offset()); |
| 126 | |
| 127 | rcu_read_lock(); |
| 128 | |
| 129 | client = rcu_dereference(evdev->grab); |
| 130 | |
| 131 | if (client) |
| 132 | evdev_pass_values(client, vals, count, time_mono, time_real); |
| 133 | else |
| 134 | list_for_each_entry_rcu(client, &evdev->client_list, node) |
| 135 | evdev_pass_values(client, vals, count, |
| 136 | time_mono, time_real); |
| 137 | |
| 138 | rcu_read_unlock(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | /* |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 142 | * Pass incoming event to all connected clients. |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 143 | */ |
| 144 | static void evdev_event(struct input_handle *handle, |
| 145 | unsigned int type, unsigned int code, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
Henrik Rydberg | a274ac1 | 2012-08-29 20:48:02 +0200 | [diff] [blame] | 147 | struct input_value vals[] = { { type, code, value } }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Henrik Rydberg | a274ac1 | 2012-08-29 20:48:02 +0200 | [diff] [blame] | 149 | evdev_events(handle, vals, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | static int evdev_fasync(int fd, struct file *file, int on) |
| 153 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 154 | struct evdev_client *client = file->private_data; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 155 | |
Jonathan Corbet | 60aa492 | 2009-02-01 14:52:56 -0700 | [diff] [blame] | 156 | return fasync_helper(fd, file, on, &client->fasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 159 | static int evdev_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 161 | struct evdev_client *client = file->private_data; |
| 162 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 163 | int retval; |
| 164 | |
| 165 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 166 | if (retval) |
| 167 | return retval; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 168 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 169 | if (!evdev->exist) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 170 | retval = -ENODEV; |
| 171 | else |
| 172 | retval = input_flush_device(&evdev->handle, file); |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 173 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 174 | mutex_unlock(&evdev->mutex); |
| 175 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 178 | static void evdev_free(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 180 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
| 181 | |
Dmitry Torokhov | a7097ff | 2008-04-01 00:22:53 -0400 | [diff] [blame] | 182 | input_put_device(evdev->handle.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | kfree(evdev); |
| 184 | } |
| 185 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 186 | /* |
| 187 | * Grabs an event device (along with underlying input device). |
| 188 | * This function is called with evdev->mutex taken. |
| 189 | */ |
| 190 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) |
| 191 | { |
| 192 | int error; |
| 193 | |
| 194 | if (evdev->grab) |
| 195 | return -EBUSY; |
| 196 | |
| 197 | error = input_grab_device(&evdev->handle); |
| 198 | if (error) |
| 199 | return error; |
| 200 | |
| 201 | rcu_assign_pointer(evdev->grab, client); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 202 | |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) |
| 207 | { |
Dmitry Torokhov | dba4258 | 2012-05-02 00:13:36 -0700 | [diff] [blame] | 208 | struct evdev_client *grab = rcu_dereference_protected(evdev->grab, |
| 209 | lockdep_is_held(&evdev->mutex)); |
| 210 | |
| 211 | if (grab != client) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 212 | return -EINVAL; |
| 213 | |
| 214 | rcu_assign_pointer(evdev->grab, NULL); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 215 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 216 | input_release_device(&evdev->handle); |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static void evdev_attach_client(struct evdev *evdev, |
| 222 | struct evdev_client *client) |
| 223 | { |
| 224 | spin_lock(&evdev->client_lock); |
| 225 | list_add_tail_rcu(&client->node, &evdev->client_list); |
| 226 | spin_unlock(&evdev->client_lock); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 227 | } |
| 228 | |
| 229 | static void evdev_detach_client(struct evdev *evdev, |
| 230 | struct evdev_client *client) |
| 231 | { |
| 232 | spin_lock(&evdev->client_lock); |
| 233 | list_del_rcu(&client->node); |
| 234 | spin_unlock(&evdev->client_lock); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 235 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | static int evdev_open_device(struct evdev *evdev) |
| 239 | { |
| 240 | int retval; |
| 241 | |
| 242 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 243 | if (retval) |
| 244 | return retval; |
| 245 | |
| 246 | if (!evdev->exist) |
| 247 | retval = -ENODEV; |
Oliver Neukum | 0644501 | 2007-10-12 14:18:40 -0400 | [diff] [blame] | 248 | else if (!evdev->open++) { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 249 | retval = input_open_device(&evdev->handle); |
Oliver Neukum | 0644501 | 2007-10-12 14:18:40 -0400 | [diff] [blame] | 250 | if (retval) |
| 251 | evdev->open--; |
| 252 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 253 | |
| 254 | mutex_unlock(&evdev->mutex); |
| 255 | return retval; |
| 256 | } |
| 257 | |
| 258 | static void evdev_close_device(struct evdev *evdev) |
| 259 | { |
| 260 | mutex_lock(&evdev->mutex); |
| 261 | |
| 262 | if (evdev->exist && !--evdev->open) |
| 263 | input_close_device(&evdev->handle); |
| 264 | |
| 265 | mutex_unlock(&evdev->mutex); |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Wake up users waiting for IO so they can disconnect from |
| 270 | * dead device. |
| 271 | */ |
| 272 | static void evdev_hangup(struct evdev *evdev) |
| 273 | { |
| 274 | struct evdev_client *client; |
| 275 | |
| 276 | spin_lock(&evdev->client_lock); |
| 277 | list_for_each_entry(client, &evdev->client_list, node) |
| 278 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); |
| 279 | spin_unlock(&evdev->client_lock); |
| 280 | |
| 281 | wake_up_interruptible(&evdev->wait); |
| 282 | } |
| 283 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 284 | static int evdev_release(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 286 | struct evdev_client *client = file->private_data; |
| 287 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 289 | mutex_lock(&evdev->mutex); |
Dmitry Torokhov | dba4258 | 2012-05-02 00:13:36 -0700 | [diff] [blame] | 290 | evdev_ungrab(evdev, client); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 291 | mutex_unlock(&evdev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 293 | evdev_detach_client(evdev, client); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 294 | kfree(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 296 | evdev_close_device(evdev); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 297 | put_device(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | return 0; |
| 300 | } |
| 301 | |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame] | 302 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
| 303 | { |
Henrik Rydberg | 63a6404 | 2010-06-10 12:05:24 -0700 | [diff] [blame] | 304 | unsigned int n_events = |
| 305 | max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS, |
| 306 | EVDEV_MIN_BUFFER_SIZE); |
| 307 | |
| 308 | return roundup_pow_of_two(n_events); |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame] | 309 | } |
| 310 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 311 | static int evdev_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 313 | struct evdev *evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 314 | struct evdev_client *client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame] | 316 | unsigned int bufsize; |
Dmitry Torokhov | d542ed8 | 2007-04-12 01:30:15 -0400 | [diff] [blame] | 317 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 319 | if (i >= EVDEV_MINORS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | return -ENODEV; |
| 321 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 322 | error = mutex_lock_interruptible(&evdev_table_mutex); |
| 323 | if (error) |
| 324 | return error; |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 325 | evdev = evdev_table[i]; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 326 | if (evdev) |
| 327 | get_device(&evdev->dev); |
| 328 | mutex_unlock(&evdev_table_mutex); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 329 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 330 | if (!evdev) |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 331 | return -ENODEV; |
| 332 | |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame] | 333 | bufsize = evdev_compute_buffer_size(evdev->handle.dev); |
| 334 | |
| 335 | client = kzalloc(sizeof(struct evdev_client) + |
| 336 | bufsize * sizeof(struct input_event), |
| 337 | GFP_KERNEL); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 338 | if (!client) { |
| 339 | error = -ENOMEM; |
| 340 | goto err_put_evdev; |
| 341 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame] | 343 | client->bufsize = bufsize; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 344 | spin_lock_init(&client->buffer_lock); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 345 | client->evdev = evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 346 | evdev_attach_client(evdev, client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 348 | error = evdev_open_device(evdev); |
| 349 | if (error) |
| 350 | goto err_free_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 352 | file->private_data = client; |
Dmitry Torokhov | 3d7bbd4 | 2010-02-04 00:30:42 -0800 | [diff] [blame] | 353 | nonseekable_open(inode, file); |
| 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | return 0; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 356 | |
| 357 | err_free_client: |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 358 | evdev_detach_client(evdev, client); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 359 | kfree(client); |
| 360 | err_put_evdev: |
| 361 | put_device(&evdev->dev); |
| 362 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 365 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
| 366 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 368 | struct evdev_client *client = file->private_data; |
| 369 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | struct input_event event; |
Heiko Stübner | 02dfc49 | 2012-02-08 23:08:48 -0800 | [diff] [blame] | 371 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Dmitry Torokhov | 2872a9b | 2012-05-02 00:13:37 -0700 | [diff] [blame] | 373 | if (count != 0 && count < input_event_size()) |
Peter Korsgaard | 439581e | 2011-02-25 09:30:46 -0800 | [diff] [blame] | 374 | return -EINVAL; |
| 375 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 376 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 377 | if (retval) |
| 378 | return retval; |
| 379 | |
| 380 | if (!evdev->exist) { |
| 381 | retval = -ENODEV; |
| 382 | goto out; |
| 383 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 384 | |
Dmitry Torokhov | 2872a9b | 2012-05-02 00:13:37 -0700 | [diff] [blame] | 385 | while (retval + input_event_size() <= count) { |
| 386 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 387 | if (input_event_from_user(buffer + retval, &event)) { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 388 | retval = -EFAULT; |
| 389 | goto out; |
| 390 | } |
Peter Korsgaard | 439581e | 2011-02-25 09:30:46 -0800 | [diff] [blame] | 391 | retval += input_event_size(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 392 | |
| 393 | input_inject_event(&evdev->handle, |
| 394 | event.type, event.code, event.value); |
Dmitry Torokhov | 2872a9b | 2012-05-02 00:13:37 -0700 | [diff] [blame] | 395 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 396 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 397 | out: |
| 398 | mutex_unlock(&evdev->mutex); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 399 | return retval; |
| 400 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 401 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 402 | static int evdev_fetch_next_event(struct evdev_client *client, |
| 403 | struct input_event *event) |
| 404 | { |
| 405 | int have_event; |
| 406 | |
| 407 | spin_lock_irq(&client->buffer_lock); |
| 408 | |
Dima Zavin | 566cf5b | 2011-12-30 15:16:44 -0800 | [diff] [blame] | 409 | have_event = client->packet_head != client->tail; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 410 | if (have_event) { |
| 411 | *event = client->buffer[client->tail++]; |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame] | 412 | client->tail &= client->bufsize - 1; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | spin_unlock_irq(&client->buffer_lock); |
| 416 | |
| 417 | return have_event; |
| 418 | } |
| 419 | |
| 420 | static ssize_t evdev_read(struct file *file, char __user *buffer, |
| 421 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 423 | struct evdev_client *client = file->private_data; |
| 424 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 425 | struct input_event event; |
Dmitry Torokhov | 2872a9b | 2012-05-02 00:13:37 -0700 | [diff] [blame] | 426 | size_t read = 0; |
| 427 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
Dmitry Torokhov | 2872a9b | 2012-05-02 00:13:37 -0700 | [diff] [blame] | 429 | if (count != 0 && count < input_event_size()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | return -EINVAL; |
| 431 | |
Dmitry Torokhov | 2872a9b | 2012-05-02 00:13:37 -0700 | [diff] [blame] | 432 | for (;;) { |
| 433 | if (!evdev->exist) |
| 434 | return -ENODEV; |
| 435 | |
| 436 | if (client->packet_head == client->tail && |
| 437 | (file->f_flags & O_NONBLOCK)) |
| 438 | return -EAGAIN; |
| 439 | |
| 440 | /* |
| 441 | * count == 0 is special - no IO is done but we check |
| 442 | * for error conditions (see above). |
| 443 | */ |
| 444 | if (count == 0) |
| 445 | break; |
| 446 | |
| 447 | while (read + input_event_size() <= count && |
| 448 | evdev_fetch_next_event(client, &event)) { |
| 449 | |
| 450 | if (input_event_to_user(buffer + read, &event)) |
| 451 | return -EFAULT; |
| 452 | |
| 453 | read += input_event_size(); |
| 454 | } |
| 455 | |
| 456 | if (read) |
| 457 | break; |
| 458 | |
| 459 | if (!(file->f_flags & O_NONBLOCK)) { |
| 460 | error = wait_event_interruptible(evdev->wait, |
| 461 | client->packet_head != client->tail || |
| 462 | !evdev->exist); |
| 463 | if (error) |
| 464 | return error; |
| 465 | } |
Dima Zavin | 509f87c | 2011-12-30 15:16:44 -0800 | [diff] [blame] | 466 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
Dmitry Torokhov | 2872a9b | 2012-05-02 00:13:37 -0700 | [diff] [blame] | 468 | return read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | /* No kernel lock - fine */ |
| 472 | static unsigned int evdev_poll(struct file *file, poll_table *wait) |
| 473 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 474 | struct evdev_client *client = file->private_data; |
| 475 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | c18fb13 | 2010-07-15 23:28:42 -0700 | [diff] [blame] | 476 | unsigned int mask; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 477 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 478 | poll_wait(file, &evdev->wait, wait); |
Dmitry Torokhov | c18fb13 | 2010-07-15 23:28:42 -0700 | [diff] [blame] | 479 | |
| 480 | mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR; |
Jeff Brown | cdda911 | 2011-04-26 22:16:11 -0700 | [diff] [blame] | 481 | if (client->packet_head != client->tail) |
Dmitry Torokhov | c18fb13 | 2010-07-15 23:28:42 -0700 | [diff] [blame] | 482 | mask |= POLLIN | POLLRDNORM; |
| 483 | |
| 484 | return mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
| 486 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 487 | #ifdef CONFIG_COMPAT |
| 488 | |
| 489 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 490 | #define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 491 | |
| 492 | #ifdef __BIG_ENDIAN |
| 493 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 494 | unsigned int maxlen, void __user *p, int compat) |
| 495 | { |
| 496 | int len, i; |
| 497 | |
| 498 | if (compat) { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 499 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
Kenichi Nagai | bf61f8d | 2007-05-11 01:12:15 -0400 | [diff] [blame] | 500 | if (len > maxlen) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 501 | len = maxlen; |
| 502 | |
| 503 | for (i = 0; i < len / sizeof(compat_long_t); i++) |
| 504 | if (copy_to_user((compat_long_t __user *) p + i, |
| 505 | (compat_long_t *) bits + |
| 506 | i + 1 - ((i % 2) << 1), |
| 507 | sizeof(compat_long_t))) |
| 508 | return -EFAULT; |
| 509 | } else { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 510 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 511 | if (len > maxlen) |
| 512 | len = maxlen; |
| 513 | |
| 514 | if (copy_to_user(p, bits, len)) |
| 515 | return -EFAULT; |
| 516 | } |
| 517 | |
| 518 | return len; |
| 519 | } |
| 520 | #else |
| 521 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 522 | unsigned int maxlen, void __user *p, int compat) |
| 523 | { |
| 524 | int len = compat ? |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 525 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
| 526 | BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 527 | |
| 528 | if (len > maxlen) |
| 529 | len = maxlen; |
| 530 | |
| 531 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
| 532 | } |
| 533 | #endif /* __BIG_ENDIAN */ |
| 534 | |
| 535 | #else |
| 536 | |
| 537 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 538 | unsigned int maxlen, void __user *p, int compat) |
| 539 | { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 540 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 541 | |
| 542 | if (len > maxlen) |
| 543 | len = maxlen; |
| 544 | |
| 545 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
| 546 | } |
| 547 | |
| 548 | #endif /* CONFIG_COMPAT */ |
| 549 | |
| 550 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) |
| 551 | { |
| 552 | int len; |
| 553 | |
| 554 | if (!str) |
| 555 | return -ENOENT; |
| 556 | |
| 557 | len = strlen(str) + 1; |
| 558 | if (len > maxlen) |
| 559 | len = maxlen; |
| 560 | |
| 561 | return copy_to_user(p, str, len) ? -EFAULT : len; |
| 562 | } |
| 563 | |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 564 | #define OLD_KEY_MAX 0x1ff |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 565 | static int handle_eviocgbit(struct input_dev *dev, |
| 566 | unsigned int type, unsigned int size, |
| 567 | void __user *p, int compat_mode) |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 568 | { |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 569 | static unsigned long keymax_warn_time; |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 570 | unsigned long *bits; |
| 571 | int len; |
| 572 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 573 | switch (type) { |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 574 | |
| 575 | case 0: bits = dev->evbit; len = EV_MAX; break; |
| 576 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; |
| 577 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; |
| 578 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; |
| 579 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; |
| 580 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; |
| 581 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; |
| 582 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; |
| 583 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; |
| 584 | default: return -EINVAL; |
| 585 | } |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 586 | |
| 587 | /* |
| 588 | * Work around bugs in userspace programs that like to do |
| 589 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' |
| 590 | * should be in bytes, not in bits. |
| 591 | */ |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 592 | if (type == EV_KEY && size == OLD_KEY_MAX) { |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 593 | len = OLD_KEY_MAX; |
| 594 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) |
Joe Perches | da0c490 | 2010-11-29 23:33:07 -0800 | [diff] [blame] | 595 | pr_warning("(EVIOCGBIT): Suspicious buffer size %u, " |
| 596 | "limiting output to %zu bytes. See " |
| 597 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
| 598 | OLD_KEY_MAX, |
| 599 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 600 | } |
| 601 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 602 | return bits_to_user(bits, len, size, p, compat_mode); |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 603 | } |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 604 | #undef OLD_KEY_MAX |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 605 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 606 | static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p) |
| 607 | { |
| 608 | struct input_keymap_entry ke = { |
| 609 | .len = sizeof(unsigned int), |
| 610 | .flags = 0, |
| 611 | }; |
| 612 | int __user *ip = (int __user *)p; |
| 613 | int error; |
| 614 | |
| 615 | /* legacy case */ |
| 616 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
| 617 | return -EFAULT; |
| 618 | |
| 619 | error = input_get_keycode(dev, &ke); |
| 620 | if (error) |
| 621 | return error; |
| 622 | |
| 623 | if (put_user(ke.keycode, ip + 1)) |
| 624 | return -EFAULT; |
| 625 | |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p) |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 630 | { |
| 631 | struct input_keymap_entry ke; |
| 632 | int error; |
| 633 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 634 | if (copy_from_user(&ke, p, sizeof(ke))) |
| 635 | return -EFAULT; |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 636 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 637 | error = input_get_keycode(dev, &ke); |
| 638 | if (error) |
| 639 | return error; |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 640 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 641 | if (copy_to_user(p, &ke, sizeof(ke))) |
| 642 | return -EFAULT; |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 643 | |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 644 | return 0; |
| 645 | } |
| 646 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 647 | static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p) |
| 648 | { |
| 649 | struct input_keymap_entry ke = { |
| 650 | .len = sizeof(unsigned int), |
| 651 | .flags = 0, |
| 652 | }; |
| 653 | int __user *ip = (int __user *)p; |
| 654 | |
| 655 | if (copy_from_user(ke.scancode, p, sizeof(unsigned int))) |
| 656 | return -EFAULT; |
| 657 | |
| 658 | if (get_user(ke.keycode, ip + 1)) |
| 659 | return -EFAULT; |
| 660 | |
| 661 | return input_set_keycode(dev, &ke); |
| 662 | } |
| 663 | |
| 664 | static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p) |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 665 | { |
| 666 | struct input_keymap_entry ke; |
| 667 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 668 | if (copy_from_user(&ke, p, sizeof(ke))) |
| 669 | return -EFAULT; |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 670 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 671 | if (ke.len > sizeof(ke.scancode)) |
| 672 | return -EINVAL; |
Mauro Carvalho Chehab | 8613e4c | 2010-09-09 21:54:22 -0700 | [diff] [blame] | 673 | |
| 674 | return input_set_keycode(dev, &ke); |
| 675 | } |
| 676 | |
Henrik Rydberg | 1cf0c6e | 2012-02-06 08:49:25 +0100 | [diff] [blame] | 677 | static int evdev_handle_mt_request(struct input_dev *dev, |
| 678 | unsigned int size, |
| 679 | int __user *ip) |
| 680 | { |
Henrik Rydberg | 8d18fba | 2012-09-15 15:15:58 +0200 | [diff] [blame] | 681 | const struct input_mt *mt = dev->mt; |
Henrik Rydberg | 1cf0c6e | 2012-02-06 08:49:25 +0100 | [diff] [blame] | 682 | unsigned int code; |
| 683 | int max_slots; |
| 684 | int i; |
| 685 | |
| 686 | if (get_user(code, &ip[0])) |
| 687 | return -EFAULT; |
Henrik Rydberg | 8d18fba | 2012-09-15 15:15:58 +0200 | [diff] [blame] | 688 | if (!mt || !input_is_mt_value(code)) |
Henrik Rydberg | 1cf0c6e | 2012-02-06 08:49:25 +0100 | [diff] [blame] | 689 | return -EINVAL; |
| 690 | |
| 691 | max_slots = (size - sizeof(__u32)) / sizeof(__s32); |
Henrik Rydberg | 8d18fba | 2012-09-15 15:15:58 +0200 | [diff] [blame] | 692 | for (i = 0; i < mt->num_slots && i < max_slots; i++) { |
| 693 | int value = input_mt_get_value(&mt->slots[i], code); |
| 694 | if (put_user(value, &ip[1 + i])) |
Henrik Rydberg | 1cf0c6e | 2012-02-06 08:49:25 +0100 | [diff] [blame] | 695 | return -EFAULT; |
Henrik Rydberg | 8d18fba | 2012-09-15 15:15:58 +0200 | [diff] [blame] | 696 | } |
Henrik Rydberg | 1cf0c6e | 2012-02-06 08:49:25 +0100 | [diff] [blame] | 697 | |
| 698 | return 0; |
| 699 | } |
| 700 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 701 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
| 702 | void __user *p, int compat_mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 704 | struct evdev_client *client = file->private_data; |
| 705 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | struct input_dev *dev = evdev->handle.dev; |
| 707 | struct input_absinfo abs; |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 708 | struct ff_effect effect; |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 709 | int __user *ip = (int __user *)p; |
Dmitry Torokhov | 58b9399 | 2010-03-08 22:37:10 -0800 | [diff] [blame] | 710 | unsigned int i, t, u, v; |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 711 | unsigned int size; |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 712 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 714 | /* First we check for fixed-length commands */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | switch (cmd) { |
| 716 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 717 | case EVIOCGVERSION: |
| 718 | return put_user(EV_VERSION, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 720 | case EVIOCGID: |
| 721 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) |
| 722 | return -EFAULT; |
| 723 | return 0; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 724 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 725 | case EVIOCGREP: |
| 726 | if (!test_bit(EV_REP, dev->evbit)) |
| 727 | return -ENOSYS; |
| 728 | if (put_user(dev->rep[REP_DELAY], ip)) |
| 729 | return -EFAULT; |
| 730 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) |
| 731 | return -EFAULT; |
| 732 | return 0; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 733 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 734 | case EVIOCSREP: |
| 735 | if (!test_bit(EV_REP, dev->evbit)) |
| 736 | return -ENOSYS; |
| 737 | if (get_user(u, ip)) |
| 738 | return -EFAULT; |
| 739 | if (get_user(v, ip + 1)) |
| 740 | return -EFAULT; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 741 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 742 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
| 743 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 744 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 745 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 747 | case EVIOCRMFF: |
| 748 | return input_ff_erase(dev, (int)(unsigned long) p, file); |
| 749 | |
| 750 | case EVIOCGEFFECTS: |
| 751 | i = test_bit(EV_FF, dev->evbit) ? |
| 752 | dev->ff->max_effects : 0; |
| 753 | if (put_user(i, ip)) |
| 754 | return -EFAULT; |
| 755 | return 0; |
| 756 | |
| 757 | case EVIOCGRAB: |
| 758 | if (p) |
| 759 | return evdev_grab(evdev, client); |
| 760 | else |
| 761 | return evdev_ungrab(evdev, client); |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 762 | |
John Stultz | a80b83b | 2012-02-03 00:19:07 -0800 | [diff] [blame] | 763 | case EVIOCSCLOCKID: |
| 764 | if (copy_from_user(&i, p, sizeof(unsigned int))) |
| 765 | return -EFAULT; |
| 766 | if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME) |
| 767 | return -EINVAL; |
| 768 | client->clkid = i; |
| 769 | return 0; |
| 770 | |
Dmitry Torokhov | ab4e019 | 2010-12-14 23:53:21 -0800 | [diff] [blame] | 771 | case EVIOCGKEYCODE: |
| 772 | return evdev_handle_get_keycode(dev, p); |
| 773 | |
| 774 | case EVIOCSKEYCODE: |
| 775 | return evdev_handle_set_keycode(dev, p); |
| 776 | |
| 777 | case EVIOCGKEYCODE_V2: |
| 778 | return evdev_handle_get_keycode_v2(dev, p); |
| 779 | |
| 780 | case EVIOCSKEYCODE_V2: |
| 781 | return evdev_handle_set_keycode_v2(dev, p); |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 782 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 783 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 784 | size = _IOC_SIZE(cmd); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 785 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 786 | /* Now check variable-length commands */ |
| 787 | #define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 788 | switch (EVIOC_MASK_SIZE(cmd)) { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 789 | |
Henrik Rydberg | 85b7720 | 2010-12-18 20:51:13 +0100 | [diff] [blame] | 790 | case EVIOCGPROP(0): |
| 791 | return bits_to_user(dev->propbit, INPUT_PROP_MAX, |
| 792 | size, p, compat_mode); |
| 793 | |
Henrik Rydberg | 1cf0c6e | 2012-02-06 08:49:25 +0100 | [diff] [blame] | 794 | case EVIOCGMTSLOTS(0): |
| 795 | return evdev_handle_mt_request(dev, size, ip); |
| 796 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 797 | case EVIOCGKEY(0): |
| 798 | return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 799 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 800 | case EVIOCGLED(0): |
| 801 | return bits_to_user(dev->led, LED_MAX, size, p, compat_mode); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 802 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 803 | case EVIOCGSND(0): |
| 804 | return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 805 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 806 | case EVIOCGSW(0): |
| 807 | return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 808 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 809 | case EVIOCGNAME(0): |
| 810 | return str_to_user(dev->name, size, p); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 811 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 812 | case EVIOCGPHYS(0): |
| 813 | return str_to_user(dev->phys, size, p); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 814 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 815 | case EVIOCGUNIQ(0): |
| 816 | return str_to_user(dev->uniq, size, p); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 817 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 818 | case EVIOC_MASK_SIZE(EVIOCSFF): |
| 819 | if (input_ff_effect_from_user(p, size, &effect)) |
| 820 | return -EFAULT; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 821 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 822 | error = input_ff_upload(dev, &effect, file); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 823 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 824 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
| 825 | return -EFAULT; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 826 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 827 | return error; |
| 828 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 829 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 830 | /* Multi-number variable-length handlers */ |
| 831 | if (_IOC_TYPE(cmd) != 'E') |
| 832 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 834 | if (_IOC_DIR(cmd) == _IOC_READ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 836 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
| 837 | return handle_eviocgbit(dev, |
| 838 | _IOC_NR(cmd) & EV_MAX, size, |
| 839 | p, compat_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 841 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
Adam Dawidowski | f2278f3 | 2008-06-02 01:08:10 -0400 | [diff] [blame] | 842 | |
Daniel Mack | 0a74a1d | 2010-10-18 08:43:30 -0700 | [diff] [blame] | 843 | if (!dev->absinfo) |
| 844 | return -EINVAL; |
| 845 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 846 | t = _IOC_NR(cmd) & ABS_MAX; |
| 847 | abs = dev->absinfo[t]; |
Adam Dawidowski | f2278f3 | 2008-06-02 01:08:10 -0400 | [diff] [blame] | 848 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 849 | if (copy_to_user(p, &abs, min_t(size_t, |
| 850 | size, sizeof(struct input_absinfo)))) |
| 851 | return -EFAULT; |
Adam Dawidowski | f2278f3 | 2008-06-02 01:08:10 -0400 | [diff] [blame] | 852 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 853 | return 0; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 854 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 856 | |
Daniel Mack | f9ce6eb5 | 2010-10-18 08:43:50 -0700 | [diff] [blame] | 857 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 858 | |
| 859 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
| 860 | |
Daniel Mack | 0a74a1d | 2010-10-18 08:43:30 -0700 | [diff] [blame] | 861 | if (!dev->absinfo) |
| 862 | return -EINVAL; |
| 863 | |
Dmitry Torokhov | 448cd16 | 2010-08-02 20:29:10 -0700 | [diff] [blame] | 864 | t = _IOC_NR(cmd) & ABS_MAX; |
| 865 | |
| 866 | if (copy_from_user(&abs, p, min_t(size_t, |
| 867 | size, sizeof(struct input_absinfo)))) |
| 868 | return -EFAULT; |
| 869 | |
| 870 | if (size < sizeof(struct input_absinfo)) |
| 871 | abs.resolution = 0; |
| 872 | |
| 873 | /* We can't change number of reserved MT slots */ |
| 874 | if (t == ABS_MT_SLOT) |
| 875 | return -EINVAL; |
| 876 | |
| 877 | /* |
| 878 | * Take event lock to ensure that we are not |
| 879 | * changing device parameters in the middle |
| 880 | * of event. |
| 881 | */ |
| 882 | spin_lock_irq(&dev->event_lock); |
| 883 | dev->absinfo[t] = abs; |
| 884 | spin_unlock_irq(&dev->event_lock); |
| 885 | |
| 886 | return 0; |
| 887 | } |
| 888 | } |
| 889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | return -EINVAL; |
| 891 | } |
| 892 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 893 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
| 894 | void __user *p, int compat_mode) |
| 895 | { |
| 896 | struct evdev_client *client = file->private_data; |
| 897 | struct evdev *evdev = client->evdev; |
| 898 | int retval; |
| 899 | |
| 900 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 901 | if (retval) |
| 902 | return retval; |
| 903 | |
| 904 | if (!evdev->exist) { |
| 905 | retval = -ENODEV; |
| 906 | goto out; |
| 907 | } |
| 908 | |
| 909 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); |
| 910 | |
| 911 | out: |
| 912 | mutex_unlock(&evdev->mutex); |
| 913 | return retval; |
| 914 | } |
| 915 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 916 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 917 | { |
| 918 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); |
| 919 | } |
| 920 | |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 921 | #ifdef CONFIG_COMPAT |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 922 | static long evdev_ioctl_compat(struct file *file, |
| 923 | unsigned int cmd, unsigned long arg) |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 924 | { |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 925 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 926 | } |
| 927 | #endif |
| 928 | |
Dmitry Torokhov | 66e6611 | 2006-09-14 01:31:59 -0400 | [diff] [blame] | 929 | static const struct file_operations evdev_fops = { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 930 | .owner = THIS_MODULE, |
| 931 | .read = evdev_read, |
| 932 | .write = evdev_write, |
| 933 | .poll = evdev_poll, |
| 934 | .open = evdev_open, |
| 935 | .release = evdev_release, |
| 936 | .unlocked_ioctl = evdev_ioctl, |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 937 | #ifdef CONFIG_COMPAT |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 938 | .compat_ioctl = evdev_ioctl_compat, |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 939 | #endif |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 940 | .fasync = evdev_fasync, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 941 | .flush = evdev_flush, |
| 942 | .llseek = no_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | }; |
| 944 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 945 | static int evdev_install_chrdev(struct evdev *evdev) |
| 946 | { |
| 947 | /* |
| 948 | * No need to do any locking here as calls to connect and |
| 949 | * disconnect are serialized by the input core |
| 950 | */ |
| 951 | evdev_table[evdev->minor] = evdev; |
| 952 | return 0; |
| 953 | } |
| 954 | |
| 955 | static void evdev_remove_chrdev(struct evdev *evdev) |
| 956 | { |
| 957 | /* |
| 958 | * Lock evdev table to prevent race with evdev_open() |
| 959 | */ |
| 960 | mutex_lock(&evdev_table_mutex); |
| 961 | evdev_table[evdev->minor] = NULL; |
| 962 | mutex_unlock(&evdev_table_mutex); |
| 963 | } |
| 964 | |
| 965 | /* |
| 966 | * Mark device non-existent. This disables writes, ioctls and |
| 967 | * prevents new users from opening the device. Already posted |
| 968 | * blocking reads will stay, however new ones will fail. |
| 969 | */ |
| 970 | static void evdev_mark_dead(struct evdev *evdev) |
| 971 | { |
| 972 | mutex_lock(&evdev->mutex); |
Dmitry Torokhov | 20da92d | 2010-07-15 23:27:36 -0700 | [diff] [blame] | 973 | evdev->exist = false; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 974 | mutex_unlock(&evdev->mutex); |
| 975 | } |
| 976 | |
| 977 | static void evdev_cleanup(struct evdev *evdev) |
| 978 | { |
| 979 | struct input_handle *handle = &evdev->handle; |
| 980 | |
| 981 | evdev_mark_dead(evdev); |
| 982 | evdev_hangup(evdev); |
| 983 | evdev_remove_chrdev(evdev); |
| 984 | |
| 985 | /* evdev is marked dead so no one else accesses evdev->open */ |
| 986 | if (evdev->open) { |
| 987 | input_flush_device(handle, NULL); |
| 988 | input_close_device(handle); |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | /* |
| 993 | * Create new evdev device. Note that input core serializes calls |
| 994 | * to connect and disconnect so we don't need to lock evdev_table here. |
| 995 | */ |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 996 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
| 997 | const struct input_device_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | { |
| 999 | struct evdev *evdev; |
| 1000 | int minor; |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1001 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1003 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
| 1004 | if (!evdev_table[minor]) |
| 1005 | break; |
| 1006 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | if (minor == EVDEV_MINORS) { |
Joe Perches | da0c490 | 2010-11-29 23:33:07 -0800 | [diff] [blame] | 1008 | pr_err("no more free evdev devices\n"); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1009 | return -ENFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | } |
| 1011 | |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1012 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
| 1013 | if (!evdev) |
| 1014 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 1016 | INIT_LIST_HEAD(&evdev->client_list); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1017 | spin_lock_init(&evdev->client_lock); |
| 1018 | mutex_init(&evdev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | init_waitqueue_head(&evdev->wait); |
| 1020 | |
Thadeu Lima de Souza Cascardo | 3d5cb60 | 2009-05-09 16:08:04 -0700 | [diff] [blame] | 1021 | dev_set_name(&evdev->dev, "event%d", minor); |
Dmitry Torokhov | 20da92d | 2010-07-15 23:27:36 -0700 | [diff] [blame] | 1022 | evdev->exist = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | evdev->minor = minor; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1024 | |
Dmitry Torokhov | a7097ff | 2008-04-01 00:22:53 -0400 | [diff] [blame] | 1025 | evdev->handle.dev = input_get_device(dev); |
Thadeu Lima de Souza Cascardo | 3d5cb60 | 2009-05-09 16:08:04 -0700 | [diff] [blame] | 1026 | evdev->handle.name = dev_name(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | evdev->handle.handler = handler; |
| 1028 | evdev->handle.private = evdev; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 1029 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1030 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 1031 | evdev->dev.class = &input_class; |
| 1032 | evdev->dev.parent = &dev->dev; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 1033 | evdev->dev.release = evdev_free; |
| 1034 | device_initialize(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1036 | error = input_register_handle(&evdev->handle); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1037 | if (error) |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 1038 | goto err_free_evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1040 | error = evdev_install_chrdev(evdev); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1041 | if (error) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1042 | goto err_unregister_handle; |
| 1043 | |
| 1044 | error = device_add(&evdev->dev); |
| 1045 | if (error) |
| 1046 | goto err_cleanup_evdev; |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1047 | |
| 1048 | return 0; |
| 1049 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1050 | err_cleanup_evdev: |
| 1051 | evdev_cleanup(evdev); |
| 1052 | err_unregister_handle: |
| 1053 | input_unregister_handle(&evdev->handle); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1054 | err_free_evdev: |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 1055 | put_device(&evdev->dev); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 1056 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | } |
| 1058 | |
| 1059 | static void evdev_disconnect(struct input_handle *handle) |
| 1060 | { |
| 1061 | struct evdev *evdev = handle->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 1063 | device_del(&evdev->dev); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1064 | evdev_cleanup(evdev); |
| 1065 | input_unregister_handle(handle); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 1066 | put_device(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | } |
| 1068 | |
Dmitry Torokhov | 66e6611 | 2006-09-14 01:31:59 -0400 | [diff] [blame] | 1069 | static const struct input_device_id evdev_ids[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | { .driver_info = 1 }, /* Matches all devices */ |
| 1071 | { }, /* Terminating zero entry */ |
| 1072 | }; |
| 1073 | |
| 1074 | MODULE_DEVICE_TABLE(input, evdev_ids); |
| 1075 | |
| 1076 | static struct input_handler evdev_handler = { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1077 | .event = evdev_event, |
Henrik Rydberg | a274ac1 | 2012-08-29 20:48:02 +0200 | [diff] [blame] | 1078 | .events = evdev_events, |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 1079 | .connect = evdev_connect, |
| 1080 | .disconnect = evdev_disconnect, |
| 1081 | .fops = &evdev_fops, |
| 1082 | .minor = EVDEV_MINOR_BASE, |
| 1083 | .name = "evdev", |
| 1084 | .id_table = evdev_ids, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | }; |
| 1086 | |
| 1087 | static int __init evdev_init(void) |
| 1088 | { |
Dmitry Torokhov | 4263cf0 | 2006-09-14 01:32:39 -0400 | [diff] [blame] | 1089 | return input_register_handler(&evdev_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | } |
| 1091 | |
| 1092 | static void __exit evdev_exit(void) |
| 1093 | { |
| 1094 | input_unregister_handler(&evdev_handler); |
| 1095 | } |
| 1096 | |
| 1097 | module_init(evdev_init); |
| 1098 | module_exit(evdev_exit); |
| 1099 | |
| 1100 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| 1101 | MODULE_DESCRIPTION("Input driver event char devices"); |
| 1102 | MODULE_LICENSE("GPL"); |