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 |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 13 | #define EVDEV_MIN_BUFFER_SIZE 64 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
| 15 | #include <linux/poll.h> |
Alexey Dobriyan | a99bbaf | 2009-10-04 16:11:37 +0400 | [diff] [blame] | 16 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/slab.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/input.h> |
| 21 | #include <linux/major.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/device.h> |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 23 | #include "input-compat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | struct evdev { |
| 26 | int exist; |
| 27 | int open; |
| 28 | int minor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | int head; |
| 40 | int tail; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 41 | spinlock_t buffer_lock; /* protects access to buffer, head and tail */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | struct fasync_struct *fasync; |
| 43 | struct evdev *evdev; |
| 44 | struct list_head node; |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 45 | int bufsize; |
| 46 | struct input_event buffer[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
| 49 | static struct evdev *evdev_table[EVDEV_MINORS]; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 50 | static DEFINE_MUTEX(evdev_table_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 52 | static void evdev_pass_event(struct evdev_client *client, |
| 53 | struct input_event *event) |
| 54 | { |
| 55 | /* |
| 56 | * Interrupts are disabled, just acquire the lock |
| 57 | */ |
| 58 | spin_lock(&client->buffer_lock); |
| 59 | client->buffer[client->head++] = *event; |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 60 | client->head &= client->bufsize - 1; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 61 | spin_unlock(&client->buffer_lock); |
| 62 | |
Adam Jackson | 30a589f | 2010-01-05 17:56:04 -0800 | [diff] [blame] | 63 | if (event->type == EV_SYN) |
| 64 | kill_fasync(&client->fasync, SIGIO, POLL_IN); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | /* |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 68 | * Pass incoming event to all connected clients. |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 69 | */ |
| 70 | static void evdev_event(struct input_handle *handle, |
| 71 | unsigned int type, unsigned int code, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
| 73 | struct evdev *evdev = handle->private; |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 74 | struct evdev_client *client; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 75 | struct input_event event; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 77 | do_gettimeofday(&event.time); |
| 78 | event.type = type; |
| 79 | event.code = code; |
| 80 | event.value = value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 82 | rcu_read_lock(); |
| 83 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 84 | client = rcu_dereference(evdev->grab); |
| 85 | if (client) |
| 86 | evdev_pass_event(client, &event); |
| 87 | else |
| 88 | list_for_each_entry_rcu(client, &evdev->client_list, node) |
| 89 | evdev_pass_event(client, &event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 91 | rcu_read_unlock(); |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | wake_up_interruptible(&evdev->wait); |
| 94 | } |
| 95 | |
| 96 | static int evdev_fasync(int fd, struct file *file, int on) |
| 97 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 98 | struct evdev_client *client = file->private_data; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 99 | |
Jonathan Corbet | 60aa492 | 2009-02-01 14:52:56 -0700 | [diff] [blame] | 100 | return fasync_helper(fd, file, on, &client->fasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | } |
| 102 | |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 103 | static int evdev_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 105 | struct evdev_client *client = file->private_data; |
| 106 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 107 | int retval; |
| 108 | |
| 109 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 110 | if (retval) |
| 111 | return retval; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 112 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 113 | if (!evdev->exist) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 114 | retval = -ENODEV; |
| 115 | else |
| 116 | retval = input_flush_device(&evdev->handle, file); |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 117 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 118 | mutex_unlock(&evdev->mutex); |
| 119 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 122 | static void evdev_free(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 124 | struct evdev *evdev = container_of(dev, struct evdev, dev); |
| 125 | |
Dmitry Torokhov | a7097ff | 2008-04-01 00:22:53 -0400 | [diff] [blame] | 126 | input_put_device(evdev->handle.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | kfree(evdev); |
| 128 | } |
| 129 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 130 | /* |
| 131 | * Grabs an event device (along with underlying input device). |
| 132 | * This function is called with evdev->mutex taken. |
| 133 | */ |
| 134 | static int evdev_grab(struct evdev *evdev, struct evdev_client *client) |
| 135 | { |
| 136 | int error; |
| 137 | |
| 138 | if (evdev->grab) |
| 139 | return -EBUSY; |
| 140 | |
| 141 | error = input_grab_device(&evdev->handle); |
| 142 | if (error) |
| 143 | return error; |
| 144 | |
| 145 | rcu_assign_pointer(evdev->grab, client); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 146 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client) |
| 152 | { |
| 153 | if (evdev->grab != client) |
| 154 | return -EINVAL; |
| 155 | |
| 156 | rcu_assign_pointer(evdev->grab, NULL); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 157 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 158 | input_release_device(&evdev->handle); |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static void evdev_attach_client(struct evdev *evdev, |
| 164 | struct evdev_client *client) |
| 165 | { |
| 166 | spin_lock(&evdev->client_lock); |
| 167 | list_add_tail_rcu(&client->node, &evdev->client_list); |
| 168 | spin_unlock(&evdev->client_lock); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 169 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | static void evdev_detach_client(struct evdev *evdev, |
| 173 | struct evdev_client *client) |
| 174 | { |
| 175 | spin_lock(&evdev->client_lock); |
| 176 | list_del_rcu(&client->node); |
| 177 | spin_unlock(&evdev->client_lock); |
Dmitry Torokhov | 82ba56c | 2007-10-13 15:46:55 -0400 | [diff] [blame] | 178 | synchronize_rcu(); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | static int evdev_open_device(struct evdev *evdev) |
| 182 | { |
| 183 | int retval; |
| 184 | |
| 185 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 186 | if (retval) |
| 187 | return retval; |
| 188 | |
| 189 | if (!evdev->exist) |
| 190 | retval = -ENODEV; |
Oliver Neukum | 0644501 | 2007-10-12 14:18:40 -0400 | [diff] [blame] | 191 | else if (!evdev->open++) { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 192 | retval = input_open_device(&evdev->handle); |
Oliver Neukum | 0644501 | 2007-10-12 14:18:40 -0400 | [diff] [blame] | 193 | if (retval) |
| 194 | evdev->open--; |
| 195 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 196 | |
| 197 | mutex_unlock(&evdev->mutex); |
| 198 | return retval; |
| 199 | } |
| 200 | |
| 201 | static void evdev_close_device(struct evdev *evdev) |
| 202 | { |
| 203 | mutex_lock(&evdev->mutex); |
| 204 | |
| 205 | if (evdev->exist && !--evdev->open) |
| 206 | input_close_device(&evdev->handle); |
| 207 | |
| 208 | mutex_unlock(&evdev->mutex); |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Wake up users waiting for IO so they can disconnect from |
| 213 | * dead device. |
| 214 | */ |
| 215 | static void evdev_hangup(struct evdev *evdev) |
| 216 | { |
| 217 | struct evdev_client *client; |
| 218 | |
| 219 | spin_lock(&evdev->client_lock); |
| 220 | list_for_each_entry(client, &evdev->client_list, node) |
| 221 | kill_fasync(&client->fasync, SIGIO, POLL_HUP); |
| 222 | spin_unlock(&evdev->client_lock); |
| 223 | |
| 224 | wake_up_interruptible(&evdev->wait); |
| 225 | } |
| 226 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 227 | static int evdev_release(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 229 | struct evdev_client *client = file->private_data; |
| 230 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 232 | mutex_lock(&evdev->mutex); |
| 233 | if (evdev->grab == client) |
| 234 | evdev_ungrab(evdev, client); |
| 235 | mutex_unlock(&evdev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 237 | evdev_detach_client(evdev, client); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 238 | kfree(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 240 | evdev_close_device(evdev); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 241 | put_device(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | return 0; |
| 244 | } |
| 245 | |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 246 | static unsigned int evdev_compute_buffer_size(struct input_dev *dev) |
| 247 | { |
| 248 | return EVDEV_MIN_BUFFER_SIZE; |
| 249 | } |
| 250 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 251 | static int evdev_open(struct inode *inode, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 253 | struct evdev *evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 254 | struct evdev_client *client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | int i = iminor(inode) - EVDEV_MINOR_BASE; |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 256 | unsigned int bufsize; |
Dmitry Torokhov | d542ed8 | 2007-04-12 01:30:15 -0400 | [diff] [blame] | 257 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 259 | if (i >= EVDEV_MINORS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | return -ENODEV; |
| 261 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 262 | error = mutex_lock_interruptible(&evdev_table_mutex); |
| 263 | if (error) |
| 264 | return error; |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 265 | evdev = evdev_table[i]; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 266 | if (evdev) |
| 267 | get_device(&evdev->dev); |
| 268 | mutex_unlock(&evdev_table_mutex); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 269 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 270 | if (!evdev) |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 271 | return -ENODEV; |
| 272 | |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 273 | bufsize = evdev_compute_buffer_size(evdev->handle.dev); |
| 274 | |
| 275 | client = kzalloc(sizeof(struct evdev_client) + |
| 276 | bufsize * sizeof(struct input_event), |
| 277 | GFP_KERNEL); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 278 | if (!client) { |
| 279 | error = -ENOMEM; |
| 280 | goto err_put_evdev; |
| 281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 283 | client->bufsize = bufsize; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 284 | spin_lock_init(&client->buffer_lock); |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 285 | client->evdev = evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 286 | evdev_attach_client(evdev, client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 288 | error = evdev_open_device(evdev); |
| 289 | if (error) |
| 290 | goto err_free_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 292 | file->private_data = client; |
Dmitry Torokhov | 3d7bbd4 | 2010-02-04 00:30:42 -0800 | [diff] [blame] | 293 | nonseekable_open(inode, file); |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | return 0; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 296 | |
| 297 | err_free_client: |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 298 | evdev_detach_client(evdev, client); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 299 | kfree(client); |
| 300 | err_put_evdev: |
| 301 | put_device(&evdev->dev); |
| 302 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 305 | static ssize_t evdev_write(struct file *file, const char __user *buffer, |
| 306 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 308 | struct evdev_client *client = file->private_data; |
| 309 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | struct input_event event; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 311 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 313 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 314 | if (retval) |
| 315 | return retval; |
| 316 | |
| 317 | if (!evdev->exist) { |
| 318 | retval = -ENODEV; |
| 319 | goto out; |
| 320 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 321 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 322 | while (retval < count) { |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 323 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 324 | if (input_event_from_user(buffer + retval, &event)) { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 325 | retval = -EFAULT; |
| 326 | goto out; |
| 327 | } |
| 328 | |
| 329 | input_inject_event(&evdev->handle, |
| 330 | event.type, event.code, event.value); |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 331 | retval += input_event_size(); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 332 | } |
| 333 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 334 | out: |
| 335 | mutex_unlock(&evdev->mutex); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 336 | return retval; |
| 337 | } |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 338 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 339 | static int evdev_fetch_next_event(struct evdev_client *client, |
| 340 | struct input_event *event) |
| 341 | { |
| 342 | int have_event; |
| 343 | |
| 344 | spin_lock_irq(&client->buffer_lock); |
| 345 | |
| 346 | have_event = client->head != client->tail; |
| 347 | if (have_event) { |
| 348 | *event = client->buffer[client->tail++]; |
Henrik Rydberg | b58f708 | 2010-06-23 09:17:56 -0700 | [diff] [blame^] | 349 | client->tail &= client->bufsize - 1; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | spin_unlock_irq(&client->buffer_lock); |
| 353 | |
| 354 | return have_event; |
| 355 | } |
| 356 | |
| 357 | static ssize_t evdev_read(struct file *file, char __user *buffer, |
| 358 | size_t count, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 360 | struct evdev_client *client = file->private_data; |
| 361 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 362 | struct input_event event; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | int retval; |
| 364 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 365 | if (count < input_event_size()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | return -EINVAL; |
| 367 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 368 | if (client->head == client->tail && evdev->exist && |
| 369 | (file->f_flags & O_NONBLOCK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | return -EAGAIN; |
| 371 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 372 | retval = wait_event_interruptible(evdev->wait, |
| 373 | client->head != client->tail || !evdev->exist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | if (retval) |
| 375 | return retval; |
| 376 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 377 | if (!evdev->exist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | return -ENODEV; |
| 379 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 380 | while (retval + input_event_size() <= count && |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 381 | evdev_fetch_next_event(client, &event)) { |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 382 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 383 | if (input_event_to_user(buffer + retval, &event)) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 384 | return -EFAULT; |
| 385 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 386 | retval += input_event_size(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | return retval; |
| 390 | } |
| 391 | |
| 392 | /* No kernel lock - fine */ |
| 393 | static unsigned int evdev_poll(struct file *file, poll_table *wait) |
| 394 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 395 | struct evdev_client *client = file->private_data; |
| 396 | struct evdev *evdev = client->evdev; |
Dmitry Torokhov | 1e0afb2 | 2006-06-26 01:48:47 -0400 | [diff] [blame] | 397 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 398 | poll_wait(file, &evdev->wait, wait); |
| 399 | return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) | |
| 400 | (evdev->exist ? 0 : (POLLHUP | POLLERR)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 403 | #ifdef CONFIG_COMPAT |
| 404 | |
| 405 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 406 | #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] | 407 | |
| 408 | #ifdef __BIG_ENDIAN |
| 409 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 410 | unsigned int maxlen, void __user *p, int compat) |
| 411 | { |
| 412 | int len, i; |
| 413 | |
| 414 | if (compat) { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 415 | len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t); |
Kenichi Nagai | bf61f8d | 2007-05-11 01:12:15 -0400 | [diff] [blame] | 416 | if (len > maxlen) |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 417 | len = maxlen; |
| 418 | |
| 419 | for (i = 0; i < len / sizeof(compat_long_t); i++) |
| 420 | if (copy_to_user((compat_long_t __user *) p + i, |
| 421 | (compat_long_t *) bits + |
| 422 | i + 1 - ((i % 2) << 1), |
| 423 | sizeof(compat_long_t))) |
| 424 | return -EFAULT; |
| 425 | } else { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 426 | len = BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 427 | if (len > maxlen) |
| 428 | len = maxlen; |
| 429 | |
| 430 | if (copy_to_user(p, bits, len)) |
| 431 | return -EFAULT; |
| 432 | } |
| 433 | |
| 434 | return len; |
| 435 | } |
| 436 | #else |
| 437 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 438 | unsigned int maxlen, void __user *p, int compat) |
| 439 | { |
| 440 | int len = compat ? |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 441 | BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) : |
| 442 | BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 443 | |
| 444 | if (len > maxlen) |
| 445 | len = maxlen; |
| 446 | |
| 447 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
| 448 | } |
| 449 | #endif /* __BIG_ENDIAN */ |
| 450 | |
| 451 | #else |
| 452 | |
| 453 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, |
| 454 | unsigned int maxlen, void __user *p, int compat) |
| 455 | { |
Jiri Slaby | 7b19ada | 2007-10-18 23:40:32 -0700 | [diff] [blame] | 456 | int len = BITS_TO_LONGS(maxbit) * sizeof(long); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 457 | |
| 458 | if (len > maxlen) |
| 459 | len = maxlen; |
| 460 | |
| 461 | return copy_to_user(p, bits, len) ? -EFAULT : len; |
| 462 | } |
| 463 | |
| 464 | #endif /* CONFIG_COMPAT */ |
| 465 | |
| 466 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) |
| 467 | { |
| 468 | int len; |
| 469 | |
| 470 | if (!str) |
| 471 | return -ENOENT; |
| 472 | |
| 473 | len = strlen(str) + 1; |
| 474 | if (len > maxlen) |
| 475 | len = maxlen; |
| 476 | |
| 477 | return copy_to_user(p, str, len) ? -EFAULT : len; |
| 478 | } |
| 479 | |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 480 | #define OLD_KEY_MAX 0x1ff |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 481 | static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode) |
| 482 | { |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 483 | static unsigned long keymax_warn_time; |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 484 | unsigned long *bits; |
| 485 | int len; |
| 486 | |
| 487 | switch (_IOC_NR(cmd) & EV_MAX) { |
| 488 | |
| 489 | case 0: bits = dev->evbit; len = EV_MAX; break; |
| 490 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; |
| 491 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; |
| 492 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; |
| 493 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; |
| 494 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; |
| 495 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; |
| 496 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; |
| 497 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; |
| 498 | default: return -EINVAL; |
| 499 | } |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 500 | |
| 501 | /* |
| 502 | * Work around bugs in userspace programs that like to do |
| 503 | * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len' |
| 504 | * should be in bytes, not in bits. |
| 505 | */ |
| 506 | if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) { |
| 507 | len = OLD_KEY_MAX; |
| 508 | if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000)) |
| 509 | printk(KERN_WARNING |
Geert Uytterhoeven | c85e203 | 2008-08-19 11:28:23 -0400 | [diff] [blame] | 510 | "evdev.c(EVIOCGBIT): Suspicious buffer size %u, " |
| 511 | "limiting output to %zu bytes. See " |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 512 | "http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n", |
| 513 | OLD_KEY_MAX, |
| 514 | BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long)); |
| 515 | } |
| 516 | |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 517 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
| 518 | } |
Dmitry Torokhov | f2afa77 | 2008-08-08 11:46:53 -0400 | [diff] [blame] | 519 | #undef OLD_KEY_MAX |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 520 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 521 | static long evdev_do_ioctl(struct file *file, unsigned int cmd, |
| 522 | void __user *p, int compat_mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 524 | struct evdev_client *client = file->private_data; |
| 525 | struct evdev *evdev = client->evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | struct input_dev *dev = evdev->handle.dev; |
| 527 | struct input_absinfo abs; |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 528 | struct ff_effect effect; |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 529 | int __user *ip = (int __user *)p; |
Dmitry Torokhov | 58b9399 | 2010-03-08 22:37:10 -0800 | [diff] [blame] | 530 | unsigned int i, t, u, v; |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 531 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | switch (cmd) { |
| 534 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 535 | case EVIOCGVERSION: |
| 536 | return put_user(EV_VERSION, ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 538 | case EVIOCGID: |
| 539 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) |
| 540 | return -EFAULT; |
| 541 | return 0; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 542 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 543 | case EVIOCGREP: |
| 544 | if (!test_bit(EV_REP, dev->evbit)) |
| 545 | return -ENOSYS; |
| 546 | if (put_user(dev->rep[REP_DELAY], ip)) |
| 547 | return -EFAULT; |
| 548 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) |
| 549 | return -EFAULT; |
| 550 | return 0; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 551 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 552 | case EVIOCSREP: |
| 553 | if (!test_bit(EV_REP, dev->evbit)) |
| 554 | return -ENOSYS; |
| 555 | if (get_user(u, ip)) |
| 556 | return -EFAULT; |
| 557 | if (get_user(v, ip + 1)) |
| 558 | return -EFAULT; |
Dmitry Torokhov | 08791e5 | 2006-04-29 01:13:21 -0400 | [diff] [blame] | 559 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 560 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
| 561 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 562 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 563 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 565 | case EVIOCGKEYCODE: |
| 566 | if (get_user(t, ip)) |
| 567 | return -EFAULT; |
Marvin Raaijmakers | c8e4c77 | 2007-03-14 22:50:42 -0400 | [diff] [blame] | 568 | |
Dmitry Torokhov | f4f37c8 | 2007-11-04 00:41:12 -0400 | [diff] [blame] | 569 | error = input_get_keycode(dev, t, &v); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 570 | if (error) |
Anssi Hannula | 509ca1a | 2006-07-19 01:40:22 -0400 | [diff] [blame] | 571 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 573 | if (put_user(v, ip + 1)) |
| 574 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 576 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 578 | case EVIOCSKEYCODE: |
| 579 | if (get_user(t, ip) || get_user(v, ip + 1)) |
| 580 | return -EFAULT; |
| 581 | |
Dmitry Torokhov | f4f37c8 | 2007-11-04 00:41:12 -0400 | [diff] [blame] | 582 | return input_set_keycode(dev, t, v); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 583 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 584 | case EVIOCRMFF: |
| 585 | return input_ff_erase(dev, (int)(unsigned long) p, file); |
| 586 | |
| 587 | case EVIOCGEFFECTS: |
| 588 | i = test_bit(EV_FF, dev->evbit) ? |
| 589 | dev->ff->max_effects : 0; |
| 590 | if (put_user(i, ip)) |
| 591 | return -EFAULT; |
| 592 | return 0; |
| 593 | |
| 594 | case EVIOCGRAB: |
| 595 | if (p) |
| 596 | return evdev_grab(evdev, client); |
| 597 | else |
| 598 | return evdev_ungrab(evdev, client); |
| 599 | |
| 600 | default: |
| 601 | |
| 602 | if (_IOC_TYPE(cmd) != 'E') |
| 603 | return -EINVAL; |
| 604 | |
| 605 | if (_IOC_DIR(cmd) == _IOC_READ) { |
| 606 | |
Linus Torvalds | 5402a73 | 2008-08-05 11:42:42 -0400 | [diff] [blame] | 607 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) |
| 608 | return handle_eviocgbit(dev, cmd, p, compat_mode); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 609 | |
| 610 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
| 611 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), |
| 612 | p, compat_mode); |
| 613 | |
| 614 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
| 615 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), |
| 616 | p, compat_mode); |
| 617 | |
| 618 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
| 619 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), |
| 620 | p, compat_mode); |
| 621 | |
| 622 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
| 623 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), |
| 624 | p, compat_mode); |
| 625 | |
| 626 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
Daniel Mack | f936601 | 2009-07-13 22:22:49 -0700 | [diff] [blame] | 627 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 628 | |
| 629 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
| 630 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); |
| 631 | |
| 632 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
| 633 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); |
| 634 | |
| 635 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
| 636 | |
| 637 | t = _IOC_NR(cmd) & ABS_MAX; |
| 638 | |
| 639 | abs.value = dev->abs[t]; |
| 640 | abs.minimum = dev->absmin[t]; |
| 641 | abs.maximum = dev->absmax[t]; |
| 642 | abs.fuzz = dev->absfuzz[t]; |
| 643 | abs.flat = dev->absflat[t]; |
Tero Saarni | ec20a02 | 2009-06-10 23:27:24 -0700 | [diff] [blame] | 644 | abs.resolution = dev->absres[t]; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 645 | |
Tero Saarni | ec20a02 | 2009-06-10 23:27:24 -0700 | [diff] [blame] | 646 | if (copy_to_user(p, &abs, min_t(size_t, |
| 647 | _IOC_SIZE(cmd), |
| 648 | sizeof(struct input_absinfo)))) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 649 | return -EFAULT; |
| 650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | return 0; |
| 652 | } |
| 653 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 654 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 656 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Adam Dawidowski | f2278f3 | 2008-06-02 01:08:10 -0400 | [diff] [blame] | 658 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) { |
| 659 | |
Philip Langdale | 2d56f3a | 2008-10-16 22:31:42 -0400 | [diff] [blame] | 660 | if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect)) |
Adam Dawidowski | f2278f3 | 2008-06-02 01:08:10 -0400 | [diff] [blame] | 661 | return -EFAULT; |
| 662 | |
| 663 | error = input_ff_upload(dev, &effect, file); |
| 664 | |
| 665 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
| 666 | return -EFAULT; |
| 667 | |
| 668 | return error; |
| 669 | } |
| 670 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 671 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 673 | t = _IOC_NR(cmd) & ABS_MAX; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Tero Saarni | ec20a02 | 2009-06-10 23:27:24 -0700 | [diff] [blame] | 675 | if (copy_from_user(&abs, p, min_t(size_t, |
| 676 | _IOC_SIZE(cmd), |
| 677 | sizeof(struct input_absinfo)))) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 678 | return -EFAULT; |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 679 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 680 | /* |
| 681 | * Take event lock to ensure that we are not |
| 682 | * changing device parameters in the middle |
| 683 | * of event. |
| 684 | */ |
| 685 | spin_lock_irq(&dev->event_lock); |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 686 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 687 | dev->abs[t] = abs.value; |
| 688 | dev->absmin[t] = abs.minimum; |
| 689 | dev->absmax[t] = abs.maximum; |
| 690 | dev->absfuzz[t] = abs.fuzz; |
| 691 | dev->absflat[t] = abs.flat; |
Tero Saarni | ec20a02 | 2009-06-10 23:27:24 -0700 | [diff] [blame] | 692 | dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ? |
| 693 | 0 : abs.resolution; |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 694 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 695 | spin_unlock_irq(&dev->event_lock); |
Vojtech Pavlik | 41e979f | 2005-05-29 02:30:15 -0500 | [diff] [blame] | 696 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 697 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | } |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 699 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
| 701 | return -EINVAL; |
| 702 | } |
| 703 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 704 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, |
| 705 | void __user *p, int compat_mode) |
| 706 | { |
| 707 | struct evdev_client *client = file->private_data; |
| 708 | struct evdev *evdev = client->evdev; |
| 709 | int retval; |
| 710 | |
| 711 | retval = mutex_lock_interruptible(&evdev->mutex); |
| 712 | if (retval) |
| 713 | return retval; |
| 714 | |
| 715 | if (!evdev->exist) { |
| 716 | retval = -ENODEV; |
| 717 | goto out; |
| 718 | } |
| 719 | |
| 720 | retval = evdev_do_ioctl(file, cmd, p, compat_mode); |
| 721 | |
| 722 | out: |
| 723 | mutex_unlock(&evdev->mutex); |
| 724 | return retval; |
| 725 | } |
| 726 | |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 727 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 728 | { |
| 729 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); |
| 730 | } |
| 731 | |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 732 | #ifdef CONFIG_COMPAT |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 733 | static long evdev_ioctl_compat(struct file *file, |
| 734 | unsigned int cmd, unsigned long arg) |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 735 | { |
Dmitry Torokhov | 3a51f7c | 2005-12-11 12:40:37 -0500 | [diff] [blame] | 736 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 737 | } |
| 738 | #endif |
| 739 | |
Dmitry Torokhov | 66e6611 | 2006-09-14 01:31:59 -0400 | [diff] [blame] | 740 | static const struct file_operations evdev_fops = { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 741 | .owner = THIS_MODULE, |
| 742 | .read = evdev_read, |
| 743 | .write = evdev_write, |
| 744 | .poll = evdev_poll, |
| 745 | .open = evdev_open, |
| 746 | .release = evdev_release, |
| 747 | .unlocked_ioctl = evdev_ioctl, |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 748 | #ifdef CONFIG_COMPAT |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 749 | .compat_ioctl = evdev_ioctl_compat, |
Juergen Kreileder | 52658bb | 2005-05-29 02:26:43 -0500 | [diff] [blame] | 750 | #endif |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 751 | .fasync = evdev_fasync, |
| 752 | .flush = evdev_flush |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | }; |
| 754 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 755 | static int evdev_install_chrdev(struct evdev *evdev) |
| 756 | { |
| 757 | /* |
| 758 | * No need to do any locking here as calls to connect and |
| 759 | * disconnect are serialized by the input core |
| 760 | */ |
| 761 | evdev_table[evdev->minor] = evdev; |
| 762 | return 0; |
| 763 | } |
| 764 | |
| 765 | static void evdev_remove_chrdev(struct evdev *evdev) |
| 766 | { |
| 767 | /* |
| 768 | * Lock evdev table to prevent race with evdev_open() |
| 769 | */ |
| 770 | mutex_lock(&evdev_table_mutex); |
| 771 | evdev_table[evdev->minor] = NULL; |
| 772 | mutex_unlock(&evdev_table_mutex); |
| 773 | } |
| 774 | |
| 775 | /* |
| 776 | * Mark device non-existent. This disables writes, ioctls and |
| 777 | * prevents new users from opening the device. Already posted |
| 778 | * blocking reads will stay, however new ones will fail. |
| 779 | */ |
| 780 | static void evdev_mark_dead(struct evdev *evdev) |
| 781 | { |
| 782 | mutex_lock(&evdev->mutex); |
| 783 | evdev->exist = 0; |
| 784 | mutex_unlock(&evdev->mutex); |
| 785 | } |
| 786 | |
| 787 | static void evdev_cleanup(struct evdev *evdev) |
| 788 | { |
| 789 | struct input_handle *handle = &evdev->handle; |
| 790 | |
| 791 | evdev_mark_dead(evdev); |
| 792 | evdev_hangup(evdev); |
| 793 | evdev_remove_chrdev(evdev); |
| 794 | |
| 795 | /* evdev is marked dead so no one else accesses evdev->open */ |
| 796 | if (evdev->open) { |
| 797 | input_flush_device(handle, NULL); |
| 798 | input_close_device(handle); |
| 799 | } |
| 800 | } |
| 801 | |
| 802 | /* |
| 803 | * Create new evdev device. Note that input core serializes calls |
| 804 | * to connect and disconnect so we don't need to lock evdev_table here. |
| 805 | */ |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 806 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
| 807 | const struct input_device_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | { |
| 809 | struct evdev *evdev; |
| 810 | int minor; |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 811 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 813 | for (minor = 0; minor < EVDEV_MINORS; minor++) |
| 814 | if (!evdev_table[minor]) |
| 815 | break; |
| 816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | if (minor == EVDEV_MINORS) { |
| 818 | printk(KERN_ERR "evdev: no more free evdev devices\n"); |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 819 | return -ENFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 822 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
| 823 | if (!evdev) |
| 824 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
Dmitry Torokhov | d0ffb9b | 2007-04-12 01:30:00 -0400 | [diff] [blame] | 826 | INIT_LIST_HEAD(&evdev->client_list); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 827 | spin_lock_init(&evdev->client_lock); |
| 828 | mutex_init(&evdev->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | init_waitqueue_head(&evdev->wait); |
| 830 | |
Thadeu Lima de Souza Cascardo | 3d5cb60 | 2009-05-09 16:08:04 -0700 | [diff] [blame] | 831 | dev_set_name(&evdev->dev, "event%d", minor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | evdev->exist = 1; |
| 833 | evdev->minor = minor; |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 834 | |
Dmitry Torokhov | a7097ff | 2008-04-01 00:22:53 -0400 | [diff] [blame] | 835 | evdev->handle.dev = input_get_device(dev); |
Thadeu Lima de Souza Cascardo | 3d5cb60 | 2009-05-09 16:08:04 -0700 | [diff] [blame] | 836 | evdev->handle.name = dev_name(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | evdev->handle.handler = handler; |
| 838 | evdev->handle.private = evdev; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 839 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 840 | evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 841 | evdev->dev.class = &input_class; |
| 842 | evdev->dev.parent = &dev->dev; |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 843 | evdev->dev.release = evdev_free; |
| 844 | device_initialize(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 846 | error = input_register_handle(&evdev->handle); |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 847 | if (error) |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 848 | goto err_free_evdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 850 | error = evdev_install_chrdev(evdev); |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 851 | if (error) |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 852 | goto err_unregister_handle; |
| 853 | |
| 854 | error = device_add(&evdev->dev); |
| 855 | if (error) |
| 856 | goto err_cleanup_evdev; |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 857 | |
| 858 | return 0; |
| 859 | |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 860 | err_cleanup_evdev: |
| 861 | evdev_cleanup(evdev); |
| 862 | err_unregister_handle: |
| 863 | input_unregister_handle(&evdev->handle); |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 864 | err_free_evdev: |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 865 | put_device(&evdev->dev); |
Dmitry Torokhov | 5b2a082 | 2007-04-12 01:29:46 -0400 | [diff] [blame] | 866 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | |
| 869 | static void evdev_disconnect(struct input_handle *handle) |
| 870 | { |
| 871 | struct evdev *evdev = handle->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 873 | device_del(&evdev->dev); |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 874 | evdev_cleanup(evdev); |
| 875 | input_unregister_handle(handle); |
Dmitry Torokhov | 9657d75 | 2007-06-14 23:32:24 -0400 | [diff] [blame] | 876 | put_device(&evdev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
| 878 | |
Dmitry Torokhov | 66e6611 | 2006-09-14 01:31:59 -0400 | [diff] [blame] | 879 | static const struct input_device_id evdev_ids[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | { .driver_info = 1 }, /* Matches all devices */ |
| 881 | { }, /* Terminating zero entry */ |
| 882 | }; |
| 883 | |
| 884 | MODULE_DEVICE_TABLE(input, evdev_ids); |
| 885 | |
| 886 | static struct input_handler evdev_handler = { |
Dmitry Torokhov | 6addb1d | 2007-08-30 00:22:18 -0400 | [diff] [blame] | 887 | .event = evdev_event, |
| 888 | .connect = evdev_connect, |
| 889 | .disconnect = evdev_disconnect, |
| 890 | .fops = &evdev_fops, |
| 891 | .minor = EVDEV_MINOR_BASE, |
| 892 | .name = "evdev", |
| 893 | .id_table = evdev_ids, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | }; |
| 895 | |
| 896 | static int __init evdev_init(void) |
| 897 | { |
Dmitry Torokhov | 4263cf0 | 2006-09-14 01:32:39 -0400 | [diff] [blame] | 898 | return input_register_handler(&evdev_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | static void __exit evdev_exit(void) |
| 902 | { |
| 903 | input_unregister_handler(&evdev_handler); |
| 904 | } |
| 905 | |
| 906 | module_init(evdev_init); |
| 907 | module_exit(evdev_exit); |
| 908 | |
| 909 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
| 910 | MODULE_DESCRIPTION("Input driver event char devices"); |
| 911 | MODULE_LICENSE("GPL"); |