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 | |
| 11 | #define EVDEV_MINOR_BASE 64 |
| 12 | #define EVDEV_MINORS 32 |
| 13 | #define EVDEV_BUFFER_SIZE 64 |
| 14 | |
| 15 | #include <linux/poll.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/input.h> |
| 20 | #include <linux/major.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/device.h> |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 22 | #include <linux/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | struct evdev { |
| 25 | int exist; |
| 26 | int open; |
| 27 | int minor; |
| 28 | char name[16]; |
| 29 | struct input_handle handle; |
| 30 | wait_queue_head_t wait; |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 31 | struct evdev_client *grab; |
| 32 | struct list_head client_list; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 33 | spinlock_t client_lock; /* protects client_list */ |
| 34 | struct mutex mutex; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 35 | struct device dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | }; |
| 37 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 38 | struct evdev_client { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | struct input_event buffer[EVDEV_BUFFER_SIZE]; |
| 40 | int head; |
| 41 | int tail; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 42 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | struct fasync_struct *fasync; |
| 44 | struct evdev *evdev; |
| 45 | struct list_head node; |
| 46 | }; |
| 47 | |
| 48 | static struct evdev *evdev_table[EVDEV_MINORS]; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 49 | static DEFINE_MUTEX(evdev_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 51 | static void evdev_pass_event(struct evdev_client *client, |
| 52 | struct input_event *event) |
| 53 | { |
| 54 | /* |
| 55 | * Interrupts are disabled, just acquire the lock |
| 56 | */ |
| 57 | spin_lock(&client->buffer_lock); |
| 58 | client->buffer[client->head++] = *event; |
| 59 | client->head &= EVDEV_BUFFER_SIZE - 1; |
| 60 | spin_unlock(&client->buffer_lock); |
| 61 | |
| 62 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
| 63 | } |
| 64 | |
| 65 | /* |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 66 | * Pass incoming event to all connected clients. |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 67 | */ |
| 68 | static void evdev_event(struct input_handle *handle, |
| 69 | unsigned int type, unsigned int code, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
| 71 | struct evdev *evdev = handle->private; |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 72 | struct evdev_client *client; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 73 | struct input_event event; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 75 | do_gettimeofday(&event.time); |
| 76 | event.type = type; |
| 77 | event.code = code; |
| 78 | event.value = value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 80 | rcu_read_lock(); |
| 81 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 82 | client = rcu_dereference(evdev->grab); |
| 83 | if (client) |
| 84 | evdev_pass_event(client, &event); |
| 85 | else |
| 86 | list_for_each_entry_rcu(client, &evdev->client_list, node) |
| 87 | evdev_pass_event(client, &event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 89 | rcu_read_unlock(); |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | wake_up_interruptible(&evdev->wait); |
| 92 | } |
| 93 | |
| 94 | static int evdev_fasync(int fd, struct file *file, int on) |
| 95 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 96 | struct evdev_client *client = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | int retval; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 98 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 99 | retval = fasync_helper(fd, file, on, &client->fasync); |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | return retval < 0 ? retval : 0; |
| 102 | } |
| 103 | |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 104 | static int evdev_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 106 | struct evdev_client *client = file->private_data; |
| 107 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 108 | int retval; |
| 109 | |
| 110 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 111 | if (retval) |
| 112 | return retval; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 113 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 114 | if (!evdev->exist) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 115 | retval = -ENODEV; |
| 116 | else |
| 117 | retval = input_flush_device(&evdev->handle, file); |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 118 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 119 | mutex_unlock(&evdev->mutex); |
| 120 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | } |
| 122 | |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 123 | static void evdev_free(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 125 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
| 126 | |
Dmitry Torokhov | a7097ff | 2008-04-01 00:22:53 -0400 | [diff] [blame] | 127 | input_put_device(evdev->handle.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | kfree(evdev); |
| 129 | } |
| 130 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 131 | /* |
| 132 | * Grabs an event device (along with underlying input device). |
| 133 | * This function is called with evdev->mutex taken. |
| 134 | */ |
| 135 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) |
| 136 | { |
| 137 | int error; |
| 138 | |
| 139 | if (evdev->grab) |
| 140 | return -EBUSY; |
| 141 | |
| 142 | error = input_grab_device(&evdev->handle); |
| 143 | if (error) |
| 144 | return error; |
| 145 | |
| 146 | rcu_assign_pointer(evdev->grab, client); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 147 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) |
| 153 | { |
| 154 | if (evdev->grab != client) |
| 155 | return -EINVAL; |
| 156 | |
| 157 | rcu_assign_pointer(evdev->grab, NULL); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 158 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 159 | input_release_device(&evdev->handle); |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static void evdev_attach_client(struct evdev *evdev, |
| 165 | struct evdev_client *client) |
| 166 | { |
| 167 | spin_lock(&evdev->client_lock); |
| 168 | list_add_tail_rcu(&client->node, &evdev->client_list); |
| 169 | spin_unlock(&evdev->client_lock); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 170 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static void evdev_detach_client(struct evdev *evdev, |
| 174 | struct evdev_client *client) |
| 175 | { |
| 176 | spin_lock(&evdev->client_lock); |
| 177 | list_del_rcu(&client->node); |
| 178 | spin_unlock(&evdev->client_lock); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 179 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | static int evdev_open_device(struct evdev *evdev) |
| 183 | { |
| 184 | int retval; |
| 185 | |
| 186 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 187 | if (retval) |
| 188 | return retval; |
| 189 | |
| 190 | if (!evdev->exist) |
| 191 | retval = -ENODEV; |
Oliver Neukum | 0644501 | 2007-10-12 14:18:40 -0400 | [diff] [blame] | 192 | else if (!evdev->open++) { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 193 | retval = input_open_device(&evdev->handle); |
Oliver Neukum | 0644501 | 2007-10-12 14:18:40 -0400 | [diff] [blame] | 194 | if (retval) |
| 195 | evdev->open--; |
| 196 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 197 | |
| 198 | mutex_unlock(&evdev->mutex); |
| 199 | return retval; |
| 200 | } |
| 201 | |
| 202 | static void evdev_close_device(struct evdev *evdev) |
| 203 | { |
| 204 | mutex_lock(&evdev->mutex); |
| 205 | |
| 206 | if (evdev->exist && !--evdev->open) |
| 207 | input_close_device(&evdev->handle); |
| 208 | |
| 209 | mutex_unlock(&evdev->mutex); |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Wake up users waiting for IO so they can disconnect from |
| 214 | * dead device. |
| 215 | */ |
| 216 | static void evdev_hangup(struct evdev *evdev) |
| 217 | { |
| 218 | struct evdev_client *client; |
| 219 | |
| 220 | spin_lock(&evdev->client_lock); |
| 221 | list_for_each_entry(client, &evdev->client_list, node) |
| 222 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); |
| 223 | spin_unlock(&evdev->client_lock); |
| 224 | |
| 225 | wake_up_interruptible(&evdev->wait); |
| 226 | } |
| 227 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 228 | static int evdev_release(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 230 | struct evdev_client *client = file->private_data; |
| 231 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 233 | mutex_lock(&evdev->mutex); |
| 234 | if (evdev->grab == client) |
| 235 | evdev_ungrab(evdev, client); |
| 236 | mutex_unlock(&evdev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | evdev_fasync(-1, file, 0); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 239 | evdev_detach_client(evdev, client); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 240 | kfree(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 242 | evdev_close_device(evdev); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 243 | put_device(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 248 | static int evdev_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 250 | struct evdev *evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 251 | struct evdev_client *client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
Dmitry Torokhov | d542ed8 | 2007-04-12 01:30:15 -0400 | [diff] [blame] | 253 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 255 | if (i >= EVDEV_MINORS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | return -ENODEV; |
| 257 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 258 | error = mutex_lock_interruptible(&evdev_table_mutex); |
| 259 | if (error) |
| 260 | return error; |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 261 | evdev = evdev_table[i]; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 262 | if (evdev) |
| 263 | get_device(&evdev->dev); |
| 264 | mutex_unlock(&evdev_table_mutex); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 265 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 266 | if (!evdev) |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 267 | return -ENODEV; |
| 268 | |
| 269 | client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 270 | if (!client) { |
| 271 | error = -ENOMEM; |
| 272 | goto err_put_evdev; |
| 273 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 275 | spin_lock_init(&client->buffer_lock); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 276 | client->evdev = evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 277 | evdev_attach_client(evdev, client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 279 | error = evdev_open_device(evdev); |
| 280 | if (error) |
| 281 | goto err_free_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 283 | file->private_data = client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | return 0; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 285 | |
| 286 | err_free_client: |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 287 | evdev_detach_client(evdev, client); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 288 | kfree(client); |
| 289 | err_put_evdev: |
| 290 | put_device(&evdev->dev); |
| 291 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | } |
| 293 | |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 294 | #ifdef CONFIG_COMPAT |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 295 | |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 296 | struct input_event_compat { |
| 297 | struct compat_timeval time; |
| 298 | __u16 type; |
| 299 | __u16 code; |
| 300 | __s32 value; |
| 301 | }; |
| 302 | |
Andi Kleen | bf2fcc6 | 2006-01-11 22:44:06 +0100 | [diff] [blame] | 303 | /* Note to the author of this code: did it ever occur to |
| 304 | you why the ifdefs are needed? Think about it again. -AK */ |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 305 | #ifdef CONFIG_X86_64 |
Andi Kleen | bf2fcc6 | 2006-01-11 22:44:06 +0100 | [diff] [blame] | 306 | # define COMPAT_TEST is_compat_task() |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 307 | #elif defined(CONFIG_IA64) |
Al Viro | 6450578 | 2006-01-12 01:06:06 -0800 | [diff] [blame] | 308 | # define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current)) |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 309 | #elif defined(CONFIG_S390) |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 310 | # define COMPAT_TEST test_thread_flag(TIF_31BIT) |
Ralf Baechle | 59df6bb | 2005-09-03 15:56:23 -0700 | [diff] [blame] | 311 | #elif defined(CONFIG_MIPS) |
Ralf Baechle | 293c5bd | 2007-07-25 16:19:33 +0100 | [diff] [blame] | 312 | # define COMPAT_TEST test_thread_flag(TIF_32BIT_ADDR) |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 313 | #else |
| 314 | # define COMPAT_TEST test_thread_flag(TIF_32BIT) |
| 315 | #endif |
| 316 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 317 | static inline size_t evdev_event_size(void) |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 318 | { |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 319 | return COMPAT_TEST ? |
| 320 | sizeof(struct input_event_compat) : sizeof(struct input_event); |
| 321 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 322 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 323 | static int evdev_event_from_user(const char __user *buffer, |
| 324 | struct input_event *event) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 325 | { |
| 326 | if (COMPAT_TEST) { |
| 327 | struct input_event_compat compat_event; |
| 328 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 329 | if (copy_from_user(&compat_event, buffer, |
| 330 | sizeof(struct input_event_compat))) |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 331 | return -EFAULT; |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 332 | |
| 333 | event->time.tv_sec = compat_event.time.tv_sec; |
| 334 | event->time.tv_usec = compat_event.time.tv_usec; |
| 335 | event->type = compat_event.type; |
| 336 | event->code = compat_event.code; |
| 337 | event->value = compat_event.value; |
| 338 | |
| 339 | } else { |
| 340 | if (copy_from_user(event, buffer, sizeof(struct input_event))) |
| 341 | return -EFAULT; |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 342 | } |
| 343 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 344 | return 0; |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 345 | } |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 346 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 347 | static int evdev_event_to_user(char __user *buffer, |
| 348 | const struct input_event *event) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 349 | { |
| 350 | if (COMPAT_TEST) { |
| 351 | struct input_event_compat compat_event; |
| 352 | |
| 353 | compat_event.time.tv_sec = event->time.tv_sec; |
| 354 | compat_event.time.tv_usec = event->time.tv_usec; |
| 355 | compat_event.type = event->type; |
| 356 | compat_event.code = event->code; |
| 357 | compat_event.value = event->value; |
| 358 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 359 | if (copy_to_user(buffer, &compat_event, |
| 360 | sizeof(struct input_event_compat))) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 361 | return -EFAULT; |
| 362 | |
| 363 | } else { |
| 364 | if (copy_to_user(buffer, event, sizeof(struct input_event))) |
| 365 | return -EFAULT; |
| 366 | } |
| 367 | |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | #else |
| 372 | |
| 373 | static inline size_t evdev_event_size(void) |
| 374 | { |
| 375 | return sizeof(struct input_event); |
| 376 | } |
| 377 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 378 | static int evdev_event_from_user(const char __user *buffer, |
| 379 | struct input_event *event) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 380 | { |
| 381 | if (copy_from_user(event, buffer, sizeof(struct input_event))) |
| 382 | return -EFAULT; |
| 383 | |
| 384 | return 0; |
| 385 | } |
| 386 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 387 | static int evdev_event_to_user(char __user *buffer, |
| 388 | const struct input_event *event) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 389 | { |
| 390 | if (copy_to_user(buffer, event, sizeof(struct input_event))) |
| 391 | return -EFAULT; |
| 392 | |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | #endif /* CONFIG_COMPAT */ |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 397 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 398 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
| 399 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 401 | struct evdev_client *client = file->private_data; |
| 402 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | struct input_event event; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 404 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 406 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 407 | if (retval) |
| 408 | return retval; |
| 409 | |
| 410 | if (!evdev->exist) { |
| 411 | retval = -ENODEV; |
| 412 | goto out; |
| 413 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 414 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 415 | while (retval < count) { |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 416 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 417 | if (evdev_event_from_user(buffer + retval, &event)) { |
| 418 | retval = -EFAULT; |
| 419 | goto out; |
| 420 | } |
| 421 | |
| 422 | input_inject_event(&evdev->handle, |
| 423 | event.type, event.code, event.value); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 424 | retval += evdev_event_size(); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 425 | } |
| 426 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 427 | out: |
| 428 | mutex_unlock(&evdev->mutex); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 429 | return retval; |
| 430 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 431 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 432 | static int evdev_fetch_next_event(struct evdev_client *client, |
| 433 | struct input_event *event) |
| 434 | { |
| 435 | int have_event; |
| 436 | |
| 437 | spin_lock_irq(&client->buffer_lock); |
| 438 | |
| 439 | have_event = client->head != client->tail; |
| 440 | if (have_event) { |
| 441 | *event = client->buffer[client->tail++]; |
| 442 | client->tail &= EVDEV_BUFFER_SIZE - 1; |
| 443 | } |
| 444 | |
| 445 | spin_unlock_irq(&client->buffer_lock); |
| 446 | |
| 447 | return have_event; |
| 448 | } |
| 449 | |
| 450 | static ssize_t evdev_read(struct file *file, char __user *buffer, |
| 451 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 453 | struct evdev_client *client = file->private_data; |
| 454 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 455 | struct input_event event; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | int retval; |
| 457 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 458 | if (count < evdev_event_size()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return -EINVAL; |
| 460 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 461 | if (client->head == client->tail && evdev->exist && |
| 462 | (file->f_flags & O_NONBLOCK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return -EAGAIN; |
| 464 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 465 | retval = wait_event_interruptible(evdev->wait, |
| 466 | client->head != client->tail || !evdev->exist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | if (retval) |
| 468 | return retval; |
| 469 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 470 | if (!evdev->exist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | return -ENODEV; |
| 472 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 473 | while (retval + evdev_event_size() <= count && |
| 474 | evdev_fetch_next_event(client, &event)) { |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 475 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 476 | if (evdev_event_to_user(buffer + retval, &event)) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 477 | return -EFAULT; |
| 478 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 479 | retval += evdev_event_size(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | return retval; |
| 483 | } |
| 484 | |
| 485 | /* No kernel lock - fine */ |
| 486 | static unsigned int evdev_poll(struct file *file, poll_table *wait) |
| 487 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 488 | struct evdev_client *client = file->private_data; |
| 489 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 490 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 491 | poll_wait(file, &evdev->wait, wait); |
| 492 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | |
| 493 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 496 | #ifdef CONFIG_COMPAT |
| 497 | |
| 498 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 499 | #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] | 500 | |
| 501 | #ifdef __BIG_ENDIAN |
| 502 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 503 | unsigned int maxlen, void __user *p, int compat) |
| 504 | { |
| 505 | int len, i; |
| 506 | |
| 507 | if (compat) { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 508 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
Kenichi Nagai | bf61f8d | 2007-05-11 01:12:15 -0400 | [diff] [blame] | 509 | if (len > maxlen) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 510 | len = maxlen; |
| 511 | |
| 512 | for (i = 0; i < len / sizeof(compat_long_t); i++) |
| 513 | if (copy_to_user((compat_long_t __user *) p + i, |
| 514 | (compat_long_t *) bits + |
| 515 | i + 1 - ((i % 2) << 1), |
| 516 | sizeof(compat_long_t))) |
| 517 | return -EFAULT; |
| 518 | } else { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 519 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 520 | if (len > maxlen) |
| 521 | len = maxlen; |
| 522 | |
| 523 | if (copy_to_user(p, bits, len)) |
| 524 | return -EFAULT; |
| 525 | } |
| 526 | |
| 527 | return len; |
| 528 | } |
| 529 | #else |
| 530 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 531 | unsigned int maxlen, void __user *p, int compat) |
| 532 | { |
| 533 | int len = compat ? |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 534 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
| 535 | BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 536 | |
| 537 | if (len > maxlen) |
| 538 | len = maxlen; |
| 539 | |
| 540 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
| 541 | } |
| 542 | #endif /* __BIG_ENDIAN */ |
| 543 | |
| 544 | #else |
| 545 | |
| 546 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 547 | unsigned int maxlen, void __user *p, int compat) |
| 548 | { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 549 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 550 | |
| 551 | if (len > maxlen) |
| 552 | len = maxlen; |
| 553 | |
| 554 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
| 555 | } |
| 556 | |
| 557 | #endif /* CONFIG_COMPAT */ |
| 558 | |
| 559 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) |
| 560 | { |
| 561 | int len; |
| 562 | |
| 563 | if (!str) |
| 564 | return -ENOENT; |
| 565 | |
| 566 | len = strlen(str) + 1; |
| 567 | if (len > maxlen) |
| 568 | len = maxlen; |
| 569 | |
| 570 | return copy_to_user(p, str, len) ? -EFAULT : len; |
| 571 | } |
| 572 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 573 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
| 574 | void __user *p, int compat_mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 576 | struct evdev_client *client = file->private_data; |
| 577 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | struct input_dev *dev = evdev->handle.dev; |
| 579 | struct input_absinfo abs; |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 580 | struct ff_effect effect; |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 581 | int __user *ip = (int __user *)p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | int i, t, u, v; |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 583 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | switch (cmd) { |
| 586 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 587 | case EVIOCGVERSION: |
| 588 | return put_user(EV_VERSION, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 590 | case EVIOCGID: |
| 591 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) |
| 592 | return -EFAULT; |
| 593 | return 0; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 594 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 595 | case EVIOCGREP: |
| 596 | if (!test_bit(EV_REP, dev->evbit)) |
| 597 | return -ENOSYS; |
| 598 | if (put_user(dev->rep[REP_DELAY], ip)) |
| 599 | return -EFAULT; |
| 600 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) |
| 601 | return -EFAULT; |
| 602 | return 0; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 603 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 604 | case EVIOCSREP: |
| 605 | if (!test_bit(EV_REP, dev->evbit)) |
| 606 | return -ENOSYS; |
| 607 | if (get_user(u, ip)) |
| 608 | return -EFAULT; |
| 609 | if (get_user(v, ip + 1)) |
| 610 | return -EFAULT; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 611 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 612 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
| 613 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 614 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 615 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 617 | case EVIOCGKEYCODE: |
| 618 | if (get_user(t, ip)) |
| 619 | return -EFAULT; |
Marvin Raaijmakers | c8e4c77 | 2007-03-14 22:50:42 -0400 | [diff] [blame] | 620 | |
Dmitry Torokhov | f4f37c8 | 2007-11-04 00:41:12 -0400 | [diff] [blame] | 621 | error = input_get_keycode(dev, t, &v); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 622 | if (error) |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 623 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 625 | if (put_user(v, ip + 1)) |
| 626 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 628 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 630 | case EVIOCSKEYCODE: |
| 631 | if (get_user(t, ip) || get_user(v, ip + 1)) |
| 632 | return -EFAULT; |
| 633 | |
Dmitry Torokhov | f4f37c8 | 2007-11-04 00:41:12 -0400 | [diff] [blame] | 634 | return input_set_keycode(dev, t, v); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 635 | |
| 636 | case EVIOCSFF: |
| 637 | if (copy_from_user(&effect, p, sizeof(effect))) |
| 638 | return -EFAULT; |
| 639 | |
| 640 | error = input_ff_upload(dev, &effect, file); |
| 641 | |
| 642 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
| 643 | return -EFAULT; |
| 644 | |
| 645 | return error; |
| 646 | |
| 647 | case EVIOCRMFF: |
| 648 | return input_ff_erase(dev, (int)(unsigned long) p, file); |
| 649 | |
| 650 | case EVIOCGEFFECTS: |
| 651 | i = test_bit(EV_FF, dev->evbit) ? |
| 652 | dev->ff->max_effects : 0; |
| 653 | if (put_user(i, ip)) |
| 654 | return -EFAULT; |
| 655 | return 0; |
| 656 | |
| 657 | case EVIOCGRAB: |
| 658 | if (p) |
| 659 | return evdev_grab(evdev, client); |
| 660 | else |
| 661 | return evdev_ungrab(evdev, client); |
| 662 | |
| 663 | default: |
| 664 | |
| 665 | if (_IOC_TYPE(cmd) != 'E') |
| 666 | return -EINVAL; |
| 667 | |
| 668 | if (_IOC_DIR(cmd) == _IOC_READ) { |
| 669 | |
| 670 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) { |
| 671 | |
| 672 | unsigned long *bits; |
| 673 | int len; |
| 674 | |
| 675 | switch (_IOC_NR(cmd) & EV_MAX) { |
| 676 | |
| 677 | case 0: bits = dev->evbit; len = EV_MAX; break; |
| 678 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; |
| 679 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; |
| 680 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; |
| 681 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; |
| 682 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; |
| 683 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; |
| 684 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; |
| 685 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; |
| 686 | default: return -EINVAL; |
Dmitry Torokhov | f4f37c8 | 2007-11-04 00:41:12 -0400 | [diff] [blame] | 687 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 688 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
| 689 | } |
| 690 | |
| 691 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
| 692 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), |
| 693 | p, compat_mode); |
| 694 | |
| 695 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
| 696 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), |
| 697 | p, compat_mode); |
| 698 | |
| 699 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
| 700 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), |
| 701 | p, compat_mode); |
| 702 | |
| 703 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
| 704 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), |
| 705 | p, compat_mode); |
| 706 | |
| 707 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
| 708 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); |
| 709 | |
| 710 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
| 711 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); |
| 712 | |
| 713 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
| 714 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); |
| 715 | |
| 716 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
| 717 | |
| 718 | t = _IOC_NR(cmd) & ABS_MAX; |
| 719 | |
| 720 | abs.value = dev->abs[t]; |
| 721 | abs.minimum = dev->absmin[t]; |
| 722 | abs.maximum = dev->absmax[t]; |
| 723 | abs.fuzz = dev->absfuzz[t]; |
| 724 | abs.flat = dev->absflat[t]; |
| 725 | |
| 726 | if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) |
| 727 | return -EFAULT; |
| 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | return 0; |
| 730 | } |
| 731 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 732 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 734 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 736 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 738 | t = _IOC_NR(cmd) & ABS_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 740 | if (copy_from_user(&abs, p, |
| 741 | sizeof(struct input_absinfo))) |
| 742 | return -EFAULT; |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 743 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 744 | /* |
| 745 | * Take event lock to ensure that we are not |
| 746 | * changing device parameters in the middle |
| 747 | * of event. |
| 748 | */ |
| 749 | spin_lock_irq(&dev->event_lock); |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 750 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 751 | dev->abs[t] = abs.value; |
| 752 | dev->absmin[t] = abs.minimum; |
| 753 | dev->absmax[t] = abs.maximum; |
| 754 | dev->absfuzz[t] = abs.fuzz; |
| 755 | dev->absflat[t] = abs.flat; |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 756 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 757 | spin_unlock_irq(&dev->event_lock); |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 758 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 759 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 761 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | } |
| 763 | return -EINVAL; |
| 764 | } |
| 765 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 766 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
| 767 | void __user *p, int compat_mode) |
| 768 | { |
| 769 | struct evdev_client *client = file->private_data; |
| 770 | struct evdev *evdev = client->evdev; |
| 771 | int retval; |
| 772 | |
| 773 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 774 | if (retval) |
| 775 | return retval; |
| 776 | |
| 777 | if (!evdev->exist) { |
| 778 | retval = -ENODEV; |
| 779 | goto out; |
| 780 | } |
| 781 | |
| 782 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); |
| 783 | |
| 784 | out: |
| 785 | mutex_unlock(&evdev->mutex); |
| 786 | return retval; |
| 787 | } |
| 788 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 789 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 790 | { |
| 791 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); |
| 792 | } |
| 793 | |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 794 | #ifdef CONFIG_COMPAT |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 795 | static long evdev_ioctl_compat(struct file *file, |
| 796 | unsigned int cmd, unsigned long arg) |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 797 | { |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 798 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 799 | } |
| 800 | #endif |
| 801 | |
Dmitry Torokhov | 66e6611 | 2006-09-14 01:31:59 -0400 | [diff] [blame] | 802 | static const struct file_operations evdev_fops = { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 803 | .owner = THIS_MODULE, |
| 804 | .read = evdev_read, |
| 805 | .write = evdev_write, |
| 806 | .poll = evdev_poll, |
| 807 | .open = evdev_open, |
| 808 | .release = evdev_release, |
| 809 | .unlocked_ioctl = evdev_ioctl, |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 810 | #ifdef CONFIG_COMPAT |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 811 | .compat_ioctl = evdev_ioctl_compat, |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 812 | #endif |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 813 | .fasync = evdev_fasync, |
| 814 | .flush = evdev_flush |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | }; |
| 816 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 817 | static int evdev_install_chrdev(struct evdev *evdev) |
| 818 | { |
| 819 | /* |
| 820 | * No need to do any locking here as calls to connect and |
| 821 | * disconnect are serialized by the input core |
| 822 | */ |
| 823 | evdev_table[evdev->minor] = evdev; |
| 824 | return 0; |
| 825 | } |
| 826 | |
| 827 | static void evdev_remove_chrdev(struct evdev *evdev) |
| 828 | { |
| 829 | /* |
| 830 | * Lock evdev table to prevent race with evdev_open() |
| 831 | */ |
| 832 | mutex_lock(&evdev_table_mutex); |
| 833 | evdev_table[evdev->minor] = NULL; |
| 834 | mutex_unlock(&evdev_table_mutex); |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Mark device non-existent. This disables writes, ioctls and |
| 839 | * prevents new users from opening the device. Already posted |
| 840 | * blocking reads will stay, however new ones will fail. |
| 841 | */ |
| 842 | static void evdev_mark_dead(struct evdev *evdev) |
| 843 | { |
| 844 | mutex_lock(&evdev->mutex); |
| 845 | evdev->exist = 0; |
| 846 | mutex_unlock(&evdev->mutex); |
| 847 | } |
| 848 | |
| 849 | static void evdev_cleanup(struct evdev *evdev) |
| 850 | { |
| 851 | struct input_handle *handle = &evdev->handle; |
| 852 | |
| 853 | evdev_mark_dead(evdev); |
| 854 | evdev_hangup(evdev); |
| 855 | evdev_remove_chrdev(evdev); |
| 856 | |
| 857 | /* evdev is marked dead so no one else accesses evdev->open */ |
| 858 | if (evdev->open) { |
| 859 | input_flush_device(handle, NULL); |
| 860 | input_close_device(handle); |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | /* |
| 865 | * Create new evdev device. Note that input core serializes calls |
| 866 | * to connect and disconnect so we don't need to lock evdev_table here. |
| 867 | */ |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 868 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
| 869 | const struct input_device_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | { |
| 871 | struct evdev *evdev; |
| 872 | int minor; |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 873 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 875 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
| 876 | if (!evdev_table[minor]) |
| 877 | break; |
| 878 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | if (minor == EVDEV_MINORS) { |
| 880 | printk(KERN_ERR "evdev: no more free evdev devices\n"); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 881 | return -ENFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | } |
| 883 | |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 884 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
| 885 | if (!evdev) |
| 886 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 888 | INIT_LIST_HEAD(&evdev->client_list); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 889 | spin_lock_init(&evdev->client_lock); |
| 890 | mutex_init(&evdev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | init_waitqueue_head(&evdev->wait); |
| 892 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 893 | snprintf(evdev->name, sizeof(evdev->name), "event%d", minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | evdev->exist = 1; |
| 895 | evdev->minor = minor; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 896 | |
Dmitry Torokhov | a7097ff | 2008-04-01 00:22:53 -0400 | [diff] [blame] | 897 | evdev->handle.dev = input_get_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | evdev->handle.name = evdev->name; |
| 899 | evdev->handle.handler = handler; |
| 900 | evdev->handle.private = evdev; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 901 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 902 | strlcpy(evdev->dev.bus_id, evdev->name, sizeof(evdev->dev.bus_id)); |
| 903 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 904 | evdev->dev.class = &input_class; |
| 905 | evdev->dev.parent = &dev->dev; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 906 | evdev->dev.release = evdev_free; |
| 907 | device_initialize(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 909 | error = input_register_handle(&evdev->handle); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 910 | if (error) |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 911 | goto err_free_evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 913 | error = evdev_install_chrdev(evdev); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 914 | if (error) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 915 | goto err_unregister_handle; |
| 916 | |
| 917 | error = device_add(&evdev->dev); |
| 918 | if (error) |
| 919 | goto err_cleanup_evdev; |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 920 | |
| 921 | return 0; |
| 922 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 923 | err_cleanup_evdev: |
| 924 | evdev_cleanup(evdev); |
| 925 | err_unregister_handle: |
| 926 | input_unregister_handle(&evdev->handle); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 927 | err_free_evdev: |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 928 | put_device(&evdev->dev); |
Dmitry Torokhov | 5b2a0826 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 929 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | static void evdev_disconnect(struct input_handle *handle) |
| 933 | { |
| 934 | struct evdev *evdev = handle->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 936 | device_del(&evdev->dev); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 937 | evdev_cleanup(evdev); |
| 938 | input_unregister_handle(handle); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 939 | put_device(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | } |
| 941 | |
Dmitry Torokhov | 66e6611 | 2006-09-14 01:31:59 -0400 | [diff] [blame] | 942 | static const struct input_device_id evdev_ids[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | { .driver_info = 1 }, /* Matches all devices */ |
| 944 | { }, /* Terminating zero entry */ |
| 945 | }; |
| 946 | |
| 947 | MODULE_DEVICE_TABLE(input, evdev_ids); |
| 948 | |
| 949 | static struct input_handler evdev_handler = { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 950 | .event = evdev_event, |
| 951 | .connect = evdev_connect, |
| 952 | .disconnect = evdev_disconnect, |
| 953 | .fops = &evdev_fops, |
| 954 | .minor = EVDEV_MINOR_BASE, |
| 955 | .name = "evdev", |
| 956 | .id_table = evdev_ids, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | }; |
| 958 | |
| 959 | static int __init evdev_init(void) |
| 960 | { |
Dmitry Torokhov | 4263cf0 | 2006-09-14 01:32:39 -0400 | [diff] [blame] | 961 | return input_register_handler(&evdev_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | } |
| 963 | |
| 964 | static void __exit evdev_exit(void) |
| 965 | { |
| 966 | input_unregister_handler(&evdev_handler); |
| 967 | } |
| 968 | |
| 969 | module_init(evdev_init); |
| 970 | module_exit(evdev_exit); |
| 971 | |
| 972 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| 973 | MODULE_DESCRIPTION("Input driver event char devices"); |
| 974 | MODULE_LICENSE("GPL"); |