evdev.c 13.1 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
/*
2
 * $Id: evdev.c,v 1.48 2002/05/26 14:28:26 jdeneux Exp $
Linus Torvalds's avatar
Linus Torvalds committed
3
 *
Linus Torvalds's avatar
Linus Torvalds committed
4
 *  Copyright (c) 1999-2001 Vojtech Pavlik
Linus Torvalds's avatar
Linus Torvalds committed
5 6 7 8 9 10 11
 *
 *  Event char devices, giving access to raw input device events.
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
Linus Torvalds's avatar
Linus Torvalds committed
12
 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds's avatar
Linus Torvalds committed
13
 * (at your option) any later version.
Linus Torvalds's avatar
Linus Torvalds committed
14
 *
Linus Torvalds's avatar
Linus Torvalds committed
15 16 17 18
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
Linus Torvalds's avatar
Linus Torvalds committed
19
 *
Linus Torvalds's avatar
Linus Torvalds committed
20 21 22
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Linus Torvalds's avatar
Linus Torvalds committed
23
 *
Linus Torvalds's avatar
Linus Torvalds committed
24
 * Should you need to contact me, the author, you can do so either by
25 26
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
Linus Torvalds's avatar
Linus Torvalds committed
27 28 29 30 31 32 33
 */

#define EVDEV_MINOR_BASE	64
#define EVDEV_MINORS		32
#define EVDEV_BUFFER_SIZE	64

#include <linux/poll.h>
Linus Torvalds's avatar
Linus Torvalds committed
34
#include <linux/slab.h>
Linus Torvalds's avatar
Linus Torvalds committed
35 36 37 38 39 40 41 42 43
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/smp_lock.h>

struct evdev {
	int exist;
	int open;
	int minor;
44
	char name[16];
Linus Torvalds's avatar
Linus Torvalds committed
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
	struct input_handle handle;
	wait_queue_head_t wait;
	devfs_handle_t devfs;
	struct evdev_list *list;
};

struct evdev_list {
	struct input_event buffer[EVDEV_BUFFER_SIZE];
	int head;
	int tail;
	struct fasync_struct *fasync;
	struct evdev *evdev;
	struct evdev_list *next;
};

static struct evdev *evdev_table[EVDEV_MINORS] = { NULL, /* ... */ };

static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
	struct evdev *evdev = handle->private;
	struct evdev_list *list = evdev->list;

	while (list) {

Linus Torvalds's avatar
Linus Torvalds committed
69
		do_gettimeofday(&list->buffer[list->head].time);
Linus Torvalds's avatar
Linus Torvalds committed
70 71 72 73
		list->buffer[list->head].type = type;
		list->buffer[list->head].code = code;
		list->buffer[list->head].value = value;
		list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
Linus Torvalds's avatar
Linus Torvalds committed
74

Linus Torvalds's avatar
Linus Torvalds committed
75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
		kill_fasync(&list->fasync, SIGIO, POLL_IN);

		list = list->next;
	}

	wake_up_interruptible(&evdev->wait);
}

static int evdev_fasync(int fd, struct file *file, int on)
{
	int retval;
	struct evdev_list *list = file->private_data;
	retval = fasync_helper(fd, file, on, &list->fasync);
	return retval < 0 ? retval : 0;
}

91 92
static int evdev_flush(struct file * file)
{
93 94 95
	struct evdev_list *list = (struct evdev_list*)file->private_data;
	if (!list->evdev->exist) return -ENODEV;
	return input_flush_device(&list->evdev->handle, file);
96 97
}

Linus Torvalds's avatar
Linus Torvalds committed
98 99 100 101 102 103 104 105 106 107 108 109 110 111
static int evdev_release(struct inode * inode, struct file * file)
{
	struct evdev_list *list = file->private_data;
	struct evdev_list **listptr;

	listptr = &list->evdev->list;
	evdev_fasync(-1, file, 0);

	while (*listptr && (*listptr != list))
		listptr = &((*listptr)->next);
	*listptr = (*listptr)->next;

	if (!--list->evdev->open) {
		if (list->evdev->exist) {
Linus Torvalds's avatar
Linus Torvalds committed
112
			input_close_device(&list->evdev->handle);
Linus Torvalds's avatar
Linus Torvalds committed
113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
		} else {
			input_unregister_minor(list->evdev->devfs);
			evdev_table[list->evdev->minor] = NULL;
			kfree(list->evdev);
		}
	}

	kfree(list);

	return 0;
}

static int evdev_open(struct inode * inode, struct file * file)
{
	struct evdev_list *list;
Linus Torvalds's avatar
Linus Torvalds committed
128
	int i = minor(inode->i_rdev) - EVDEV_MINOR_BASE;
129
	int accept_err;
Linus Torvalds's avatar
Linus Torvalds committed
130 131 132 133

	if (i >= EVDEV_MINORS || !evdev_table[i])
		return -ENODEV;

134 135 136 137 138
	/* Ask the driver if he wishes to accept the open() */
	if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) {
		return accept_err;
	}

Linus Torvalds's avatar
Linus Torvalds committed
139 140 141 142 143 144 145 146 147 148 149 150
	if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
		return -ENOMEM;
	memset(list, 0, sizeof(struct evdev_list));

	list->evdev = evdev_table[i];
	list->next = evdev_table[i]->list;
	evdev_table[i]->list = list;

	file->private_data = list;

	if (!list->evdev->open++)
		if (list->evdev->exist)
Linus Torvalds's avatar
Linus Torvalds committed
151
			input_open_device(&list->evdev->handle);
Linus Torvalds's avatar
Linus Torvalds committed
152 153 154 155 156 157

	return 0;
}

static ssize_t evdev_write(struct file * file, const char * buffer, size_t count, loff_t *ppos)
{
Linus Torvalds's avatar
Linus Torvalds committed
158 159 160 161
	struct evdev_list *list = file->private_data;
	struct input_event event;
	int retval = 0;

162 163
	if (!list->evdev->exist) return -ENODEV;

Linus Torvalds's avatar
Linus Torvalds committed
164 165 166 167 168 169 170 171 172
	while (retval < count) {

		if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
			return -EFAULT;
		input_event(list->evdev->handle.dev, event.type, event.code, event.value);
		retval += sizeof(struct input_event);
	}

	return retval;
Linus Torvalds's avatar
Linus Torvalds committed
173 174 175 176 177 178 179 180 181 182 183
}

static ssize_t evdev_read(struct file * file, char * buffer, size_t count, loff_t *ppos)
{
	DECLARE_WAITQUEUE(wait, current);
	struct evdev_list *list = file->private_data;
	int retval = 0;

	if (list->head == list->tail) {

		add_wait_queue(&list->evdev->wait, &wait);
184
		set_current_state(TASK_INTERRUPTIBLE);
Linus Torvalds's avatar
Linus Torvalds committed
185 186 187

		while (list->head == list->tail) {

Linus Torvalds's avatar
Linus Torvalds committed
188 189 190 191
			if (!list->evdev->exist) {
				retval = -ENODEV;
				break;
			}
Linus Torvalds's avatar
Linus Torvalds committed
192 193 194 195 196 197 198 199 200 201 202 203
			if (file->f_flags & O_NONBLOCK) {
				retval = -EAGAIN;
				break;
			}
			if (signal_pending(current)) {
				retval = -ERESTARTSYS;
				break;
			}

			schedule();
		}

204
		set_current_state(TASK_RUNNING);
Linus Torvalds's avatar
Linus Torvalds committed
205 206 207 208 209 210 211 212 213 214 215 216 217
		remove_wait_queue(&list->evdev->wait, &wait);
	}

	if (retval)
		return retval;

	while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
		if (copy_to_user(buffer + retval, list->buffer + list->tail,
			 sizeof(struct input_event))) return -EFAULT;
		list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
		retval += sizeof(struct input_event);
	}

Linus Torvalds's avatar
Linus Torvalds committed
218
	return retval;
Linus Torvalds's avatar
Linus Torvalds committed
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235
}

/* No kernel lock - fine */
static unsigned int evdev_poll(struct file *file, poll_table *wait)
{
	struct evdev_list *list = file->private_data;
	poll_wait(file, &list->evdev->wait, wait);
	if (list->head != list->tail)
		return POLLIN | POLLRDNORM;
	return 0;
}

static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct evdev_list *list = file->private_data;
	struct evdev *evdev = list->evdev;
	struct input_dev *dev = evdev->handle.dev;
236
	int retval, t, u;
Linus Torvalds's avatar
Linus Torvalds committed
237

238 239
	if (!evdev->exist) return -ENODEV;

Linus Torvalds's avatar
Linus Torvalds committed
240 241 242 243 244 245 246 247 248 249 250
	switch (cmd) {

		case EVIOCGVERSION:
			return put_user(EV_VERSION, (int *) arg);

		case EVIOCGID:
			if ((retval = put_user(dev->idbus,     ((short *) arg) + 0))) return retval;
			if ((retval = put_user(dev->idvendor,  ((short *) arg) + 1))) return retval;
			if ((retval = put_user(dev->idproduct, ((short *) arg) + 2))) return retval;
			if ((retval = put_user(dev->idversion, ((short *) arg) + 3))) return retval;
			return 0;
251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
		
		case EVIOCGREP:
			if ((retval = put_user(dev->rep[0], ((int *) arg) + 0))) return retval;
			if ((retval = put_user(dev->rep[1], ((int *) arg) + 1))) return retval;
			return 0;

		case EVIOCSREP:
			if ((retval = get_user(dev->rep[0], ((int *) arg) + 0))) return retval;
			if ((retval = get_user(dev->rep[1], ((int *) arg) + 1))) return retval;
			return 0;

		case EVIOCGKEYCODE:
			if ((retval = get_user(t, ((int *) arg) + 0))) return retval;
			if (t < 0 || t > dev->keycodemax) return -EINVAL;
			switch (dev->keycodesize) {
				case 1: u = *(u8*)(dev->keycode + t); break;
				case 2: u = *(u16*)(dev->keycode + t * 2); break;
				case 4: u = *(u32*)(dev->keycode + t * 4); break;
				default: return -EINVAL;
			}
			if ((retval = put_user(u, ((int *) arg) + 1))) return retval;
			return 0;

		case EVIOCSKEYCODE:
			if ((retval = get_user(t, ((int *) arg) + 0))) return retval;
			if (t < 0 || t > dev->keycodemax) return -EINVAL;
			if ((retval = get_user(u, ((int *) arg) + 1))) return retval;
			switch (dev->keycodesize) {
				case 1: *(u8*)(dev->keycode + t) = u; break;
				case 2: *(u16*)(dev->keycode + t * 2) = u; break;
				case 4: *(u32*)(dev->keycode + t * 4) = u; break;
				default: return -EINVAL;
			}
			return 0;
Linus Torvalds's avatar
Linus Torvalds committed
285

Linus Torvalds's avatar
Linus Torvalds committed
286 287 288 289 290 291
		case EVIOCSFF:
			if (dev->upload_effect) {
				struct ff_effect effect;
				int err;

				if (copy_from_user((void*)(&effect), (void*)arg, sizeof(effect))) {
292
					return -EFAULT;
Linus Torvalds's avatar
Linus Torvalds committed
293 294 295
				}
				err = dev->upload_effect(dev, &effect);
				if (put_user(effect.id, &(((struct ff_effect*)arg)->id))) {
296
					return -EFAULT;
Linus Torvalds's avatar
Linus Torvalds committed
297 298 299 300 301 302 303 304 305 306 307 308
				}
				return err;
			}
			else return -ENOSYS;

		case EVIOCRMFF:
			if (dev->erase_effect) {
				return dev->erase_effect(dev, (int)arg);
			}
			else return -ENOSYS;

		case EVIOCGEFFECTS:
309 310
			if (retval = put_user(dev->ff_effects_max, (int*) arg))
				return -EFAULT;
Linus Torvalds's avatar
Linus Torvalds committed
311 312
			return 0;

Linus Torvalds's avatar
Linus Torvalds committed
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329
		default:

			if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ)
				return -EINVAL;

			if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {

				long *bits;
				int len;

				switch (_IOC_NR(cmd) & EV_MAX) {
					case      0: bits = dev->evbit;  len = EV_MAX;  break;
					case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
					case EV_REL: bits = dev->relbit; len = REL_MAX; break;
					case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
					case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
					case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
Linus Torvalds's avatar
Linus Torvalds committed
330
					case EV_FF:  bits = dev->ffbit;  len = FF_MAX;  break;
Linus Torvalds's avatar
Linus Torvalds committed
331 332 333
					default: return -EINVAL;
				}
				len = NBITS(len) * sizeof(long);
334
				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
Linus Torvalds's avatar
Linus Torvalds committed
335 336 337
				return copy_to_user((char *) arg, bits, len) ? -EFAULT : len;
			}

338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
				int len;
				len = NBITS(KEY_MAX) * sizeof(long);
				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
				return copy_to_user((char *) arg, dev->key, len) ? -EFAULT : len;
			}

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
				int len;
				len = NBITS(LED_MAX) * sizeof(long);
				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
				return copy_to_user((char *) arg, dev->led, len) ? -EFAULT : len;
			}

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
				int len;
				len = NBITS(SND_MAX) * sizeof(long);
				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
				return copy_to_user((char *) arg, dev->snd, len) ? -EFAULT : len;
			}

Linus Torvalds's avatar
Linus Torvalds committed
359 360
			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
				int len;
361
				if (!dev->name) return -ENOENT;
Linus Torvalds's avatar
Linus Torvalds committed
362 363 364 365 366
				len = strlen(dev->name) + 1;
				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
				return copy_to_user((char *) arg, dev->name, len) ? -EFAULT : len;
			}

367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382
			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
				int len;
				if (!dev->phys) return -ENOENT;
				len = strlen(dev->phys) + 1;
				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
				return copy_to_user((char *) arg, dev->phys, len) ? -EFAULT : len;
			}

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
				int len;
				if (!dev->uniq) return -ENOENT;
				len = strlen(dev->uniq) + 1;
				if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
				return copy_to_user((char *) arg, dev->uniq, len) ? -EFAULT : len;
			}

Linus Torvalds's avatar
Linus Torvalds committed
383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407
			if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {

				int t = _IOC_NR(cmd) & ABS_MAX;

				if ((retval = put_user(dev->abs[t],     ((int *) arg) + 0))) return retval;
				if ((retval = put_user(dev->absmin[t],  ((int *) arg) + 1))) return retval;
				if ((retval = put_user(dev->absmax[t],  ((int *) arg) + 2))) return retval;
				if ((retval = put_user(dev->absfuzz[t], ((int *) arg) + 3))) return retval;
				if ((retval = put_user(dev->absflat[t], ((int *) arg) + 4))) return retval;

				return 0;
			}
	}
	return -EINVAL;
}

static struct file_operations evdev_fops = {
	owner:		THIS_MODULE,
	read:		evdev_read,
	write:		evdev_write,
	poll:		evdev_poll,
	open:		evdev_open,
	release:	evdev_release,
	ioctl:		evdev_ioctl,
	fasync:		evdev_fasync,
408
	flush:		evdev_flush
Linus Torvalds's avatar
Linus Torvalds committed
409 410
};

411
static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
Linus Torvalds's avatar
Linus Torvalds committed
412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
{
	struct evdev *evdev;
	int minor;

	for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
	if (minor == EVDEV_MINORS) {
		printk(KERN_ERR "evdev: no more free evdev devices\n");
		return NULL;
	}

	if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
		return NULL;
	memset(evdev, 0, sizeof(struct evdev));

	init_waitqueue_head(&evdev->wait);

	evdev->minor = minor;
	evdev_table[minor] = evdev;
430 431
	
	sprintf(evdev->name, "event%d", minor);
Linus Torvalds's avatar
Linus Torvalds committed
432 433

	evdev->handle.dev = dev;
434
	evdev->handle.name = evdev->name;
Linus Torvalds's avatar
Linus Torvalds committed
435 436 437 438 439
	evdev->handle.handler = handler;
	evdev->handle.private = evdev;

	evdev->devfs = input_register_minor("event%d", minor, EVDEV_MINOR_BASE);

440
	evdev->exist = 1;
Linus Torvalds's avatar
Linus Torvalds committed
441 442 443 444 445 446 447 448 449 450 451 452

	return &evdev->handle;
}

static void evdev_disconnect(struct input_handle *handle)
{
	struct evdev *evdev = handle->private;

	evdev->exist = 0;

	if (evdev->open) {
		input_close_device(handle);
Linus Torvalds's avatar
Linus Torvalds committed
453
		wake_up_interruptible(&evdev->wait);
Linus Torvalds's avatar
Linus Torvalds committed
454 455 456 457 458 459
	} else {
		input_unregister_minor(evdev->devfs);
		evdev_table[evdev->minor] = NULL;
		kfree(evdev);
	}
}
Linus Torvalds's avatar
Linus Torvalds committed
460

461 462 463 464 465 466 467
static struct input_device_id evdev_ids[] = {
	{ driver_info: 1 },	/* Matches all devices */
	{ },			/* Terminating zero entry */
};

MODULE_DEVICE_TABLE(input, evdev_ids);

Linus Torvalds's avatar
Linus Torvalds committed
468 469 470 471 472 473
static struct input_handler evdev_handler = {
	event:		evdev_event,
	connect:	evdev_connect,
	disconnect:	evdev_disconnect,
	fops:		&evdev_fops,
	minor:		EVDEV_MINOR_BASE,
474 475
	name:		"evdev",
	id_table:	evdev_ids,
Linus Torvalds's avatar
Linus Torvalds committed
476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
};

static int __init evdev_init(void)
{
	input_register_handler(&evdev_handler);
	return 0;
}

static void __exit evdev_exit(void)
{
	input_unregister_handler(&evdev_handler);
}

module_init(evdev_init);
module_exit(evdev_exit);

492 493
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Input driver event char devices");
Linus Torvalds's avatar
Linus Torvalds committed
494
MODULE_LICENSE("GPL");