aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/joydev.c
blob: d2482e4f71be52e6262d24038d59cef314c63538 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
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
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
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
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
/*
 * Joystick device driver for the input driver suite.
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 * Copyright (c) 1999 Colin Van Dyke
 *
 * 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
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <asm/io.h>
#include <asm/system.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/joystick.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/device.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Joystick device interfaces");
MODULE_SUPPORTED_DEVICE("input/js");
MODULE_LICENSE("GPL");

#define JOYDEV_MINOR_BASE	0
#define JOYDEV_MINORS		16
#define JOYDEV_BUFFER_SIZE	64

struct joydev {
	int exist;
	int open;
	int minor;
	char name[16];
	struct input_handle handle;
	wait_queue_head_t wait;
	struct list_head list;
	struct js_corr corr[ABS_MAX + 1];
	struct JS_DATA_SAVE_TYPE glue;
	int nabs;
	int nkey;
	__u16 keymap[KEY_MAX - BTN_MISC + 1];
	__u16 keypam[KEY_MAX - BTN_MISC + 1];
	__u8 absmap[ABS_MAX + 1];
	__u8 abspam[ABS_MAX + 1];
	__s16 abs[ABS_MAX + 1];
};

struct joydev_list {
	struct js_event buffer[JOYDEV_BUFFER_SIZE];
	int head;
	int tail;
	int startup;
	struct fasync_struct *fasync;
	struct joydev *joydev;
	struct list_head node;
};

static struct joydev *joydev_table[JOYDEV_MINORS];

static int joydev_correct(int value, struct js_corr *corr)
{
	switch (corr->type) {
		case JS_CORR_NONE:
			break;
		case JS_CORR_BROKEN:
			value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
				((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
				((corr->coef[2] * (value - corr->coef[0])) >> 14);
			break;
		default:
			return 0;
	}

	return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
}

static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
	struct joydev *joydev = handle->private;
	struct joydev_list *list;
	struct js_event event;

	switch (type) {

		case EV_KEY:
			if (code < BTN_MISC || value == 2)
				return;
			event.type = JS_EVENT_BUTTON;
			event.number = joydev->keymap[code - BTN_MISC];
			event.value = value;
			break;

		case EV_ABS:
			event.type = JS_EVENT_AXIS;
			event.number = joydev->absmap[code];
			event.value = joydev_correct(value, joydev->corr + event.number);
			if (event.value == joydev->abs[event.number])
				return;
			joydev->abs[event.number] = event.value;
			break;

		default:
			return;
	}

	event.time = jiffies_to_msecs(jiffies);

	list_for_each_entry(list, &joydev->list, node) {

		memcpy(list->buffer + list->head, &event, sizeof(struct js_event));

		if (list->startup == joydev->nabs + joydev->nkey)
			if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
				list->startup = 0;

		kill_fasync(&list->fasync, SIGIO, POLL_IN);
	}

	wake_up_interruptible(&joydev->wait);
}

static int joydev_fasync(int fd, struct file *file, int on)
{
	int retval;
	struct joydev_list *list = file->private_data;

	retval = fasync_helper(fd, file, on, &list->fasync);

	return retval < 0 ? retval : 0;
}

static void joydev_free(struct joydev *joydev)
{
	joydev_table[joydev->minor] = NULL;
	kfree(joydev);
}

static int joydev_release(struct inode * inode, struct file * file)
{
	struct joydev_list *list = file->private_data;

	joydev_fasync(-1, file, 0);

	list_del(&list->node);

	if (!--list->joydev->open) {
		if (list->joydev->exist)
			input_close_device(&list->joydev->handle);
		else
			joydev_free(list->joydev);
	}

	kfree(list);
	return 0;
}

static int joydev_open(struct inode *inode, struct file *file)
{
	struct joydev_list *list;
	int i = iminor(inode) - JOYDEV_MINOR_BASE;

	if (i >= JOYDEV_MINORS || !joydev_table[i])
		return -ENODEV;

	if (!(list = kzalloc(sizeof(struct joydev_list), GFP_KERNEL)))
		return -ENOMEM;

	list->joydev = joydev_table[i];
	list_add_tail(&list->node, &joydev_table[i]->list);
	file->private_data = list;

	if (!list->joydev->open++)
		if (list->joydev->exist)
			input_open_device(&list->joydev->handle);

	return 0;
}

static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
{
	return -EINVAL;
}

static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
	struct joydev_list *list = file->private_data;
	struct joydev *joydev = list->joydev;
	struct input_dev *input = joydev->handle.dev;
	int retval = 0;

	if (!list->joydev->exist)
		return -ENODEV;

	if (count < sizeof(struct js_event))
		return -EINVAL;

	if (count == sizeof(struct JS_DATA_TYPE)) {

		struct JS_DATA_TYPE data;
		int i;

		for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
			data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
		data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
		data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;

		if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
			return -EFAULT;

		list->startup = 0;
		list->tail = list->head;

		return sizeof(struct JS_DATA_TYPE);
	}

	if (list->startup == joydev->nabs + joydev->nkey &&
	    list->head == list->tail && (file->f_flags & O_NONBLOCK))
		return -EAGAIN;

	retval = wait_event_interruptible(list->joydev->wait,
					  !list->joydev->exist ||
					  list->startup < joydev->nabs + joydev->nkey ||
					  list->head != list->tail);

	if (retval)
		return retval;

	if (!list->joydev->exist)
		return -ENODEV;

	while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {

		struct js_event event;

		event.time = jiffies_to_msecs(jiffies);

		if (list->startup < joydev->nkey) {
			event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
			event.number = list->startup;
			event.value = !!test_bit(joydev->keypam[event.number], input->key);
		} else {
			event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
			event.number = list->startup - joydev->nkey;
			event.value = joydev->abs[event.number];
		}

		if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
			return -EFAULT;

		list->startup++;
		retval += sizeof(struct js_event);
	}

	while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {

		if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
			return -EFAULT;

		list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
		retval += sizeof(struct js_event);
	}

	return retval;
}

/* No kernel lock - fine */
static unsigned int joydev_poll(struct file *file, poll_table *wait)
{
	struct joydev_list *list = file->private_data;

	poll_wait(file, &list->joydev->wait, wait);
	return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
		(POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
}

static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
{
	struct input_dev *dev = joydev->handle.dev;
	int i, j;

	switch (cmd) {

		case JS_SET_CAL:
			return copy_from_user(&joydev->glue.JS_CORR, argp,
				sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;

		case JS_GET_CAL:
			return copy_to_user(argp, &joydev->glue.JS_CORR,
				sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;

		case JS_SET_TIMEOUT:
			return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);

		case JS_GET_TIMEOUT:
			return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);

		case JSIOCGVERSION:
			return put_user(JS_VERSION, (__u32 __user *) argp);

		case JSIOCGAXES:
			return put_user(joydev->nabs, (__u8 __user *) argp);

		case JSIOCGBUTTONS:
			return put_user(joydev->nkey, (__u8 __user *) argp);

		case JSIOCSCORR:
			if (copy_from_user(joydev->corr, argp,
				      sizeof(joydev->corr[0]) * joydev->nabs))
			    return -EFAULT;
			for (i = 0; i < joydev->nabs; i++) {
				j = joydev->abspam[i];
			        joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
			}
			return 0;

		case JSIOCGCORR:
			return copy_to_user(argp, joydev->corr,
						sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;

		case JSIOCSAXMAP:
			if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
				return -EFAULT;
			for (i = 0; i < joydev->nabs; i++) {
				if (joydev->abspam[i] > ABS_MAX)
					return -EINVAL;
				joydev->absmap[joydev->abspam[i]] = i;
			}
			return 0;

		case JSIOCGAXMAP:
			return copy_to_user(argp, joydev->abspam,
						sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;

		case JSIOCSBTNMAP:
			if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
				return -EFAULT;
			for (i = 0; i < joydev->nkey; i++) {
				if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
					return -EINVAL;
				joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
			}
			return 0;

		case JSIOCGBTNMAP:
			return copy_to_user(argp, joydev->keypam,
						sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;

		default:
			if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
				int len;
				if (!dev->name)
					return 0;
				len = strlen(dev->name) + 1;
				if (len > _IOC_SIZE(cmd))
					len = _IOC_SIZE(cmd);
				if (copy_to_user(argp, dev->name, len))
					return -EFAULT;
				return len;
			}
	}
	return -EINVAL;
}

#ifdef CONFIG_COMPAT
static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct joydev_list *list = file->private_data;
	struct joydev *joydev = list->joydev;
	void __user *argp = (void __user *)arg;
	s32 tmp32;
	struct JS_DATA_SAVE_TYPE_32 ds32;
	int err;

	if (!joydev->exist)
		return -ENODEV;

	switch(cmd) {
	case JS_SET_TIMELIMIT:
		err = get_user(tmp32, (s32 __user *) arg);
		if (err == 0)
			joydev->glue.JS_TIMELIMIT = tmp32;
		break;
	case JS_GET_TIMELIMIT:
		tmp32 = joydev->glue.JS_TIMELIMIT;
		err = put_user(tmp32, (s32 __user *) arg);
		break;

	case JS_SET_ALL:
		err = copy_from_user(&ds32, argp,
				     sizeof(ds32)) ? -EFAULT : 0;
		if (err == 0) {
			joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
			joydev->glue.BUSY          = ds32.BUSY;
			joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
			joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
			joydev->glue.JS_SAVE       = ds32.JS_SAVE;
			joydev->glue.JS_CORR       = ds32.JS_CORR;
		}
		break;

	case JS_GET_ALL:
		ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
		ds32.BUSY          = joydev->glue.BUSY;
		ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
		ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
		ds32.JS_SAVE       = joydev->glue.JS_SAVE;
		ds32.JS_CORR       = joydev->glue.JS_CORR;

		err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
		break;

	default:
		err = joydev_ioctl_common(joydev, cmd, argp);
	}
	return err;
}
#endif /* CONFIG_COMPAT */

static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct joydev_list *list = file->private_data;
	struct joydev *joydev = list->joydev;
	void __user *argp = (void __user *)arg;

	if (!joydev->exist)
		return -ENODEV;

	switch(cmd) {
		case JS_SET_TIMELIMIT:
			return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
		case JS_GET_TIMELIMIT:
			return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
		case JS_SET_ALL:
			return copy_from_user(&joydev->glue, argp,
						sizeof(joydev->glue)) ? -EFAULT : 0;
		case JS_GET_ALL:
			return copy_to_user(argp, &joydev->glue,
						sizeof(joydev->glue)) ? -EFAULT : 0;
		default:
			return joydev_ioctl_common(joydev, cmd, argp);
	}
}

static const struct file_operations joydev_fops = {
	.owner =	THIS_MODULE,
	.read =		joydev_read,
	.write =	joydev_write,
	.poll =		joydev_poll,
	.open =		joydev_open,
	.release =	joydev_release,
	.ioctl =	joydev_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl =	joydev_compat_ioctl,
#endif
	.fasync =	joydev_fasync,
};

static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev,
					   const struct input_device_id *id)
{
	struct joydev *joydev;
	struct class_device *cdev;
	int i, j, t, minor;

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

	if (!(joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL)))
		return NULL;

	INIT_LIST_HEAD(&joydev->list);
	init_waitqueue_head(&joydev->wait);

	joydev->minor = minor;
	joydev->exist = 1;
	joydev->handle.dev = dev;
	joydev->handle.name = joydev->name;
	joydev->handle.handler = handler;
	joydev->handle.private = joydev;
	sprintf(joydev->name, "js%d", minor);

	for (i = 0; i < ABS_MAX + 1; i++)
		if (test_bit(i, dev->absbit)) {
			joydev->absmap[i] = joydev->nabs;
			joydev->abspam[joydev->nabs] = i;
			joydev->nabs++;
		}

	for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
		if (test_bit(i + BTN_MISC, dev->keybit)) {
			joydev->keymap[i] = joydev->nkey;
			joydev->keypam[joydev->nkey] = i + BTN_MISC;
			joydev->nkey++;
		}

	for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
		if (test_bit(i + BTN_MISC, dev->keybit)) {
			joydev->keymap[i] = joydev->nkey;
			joydev->keypam[joydev->nkey] = i + BTN_MISC;
			joydev->nkey++;
		}

	for (i = 0; i < joydev->nabs; i++) {
		j = joydev->abspam[i];
		if (dev->absmax[j] == dev->absmin[j]) {
			joydev->corr[i].type = JS_CORR_NONE;
			joydev->abs[i] = dev->abs[j];
			continue;
		}
		joydev->corr[i].type = JS_CORR_BROKEN;
		joydev->corr[i].prec = dev->absfuzz[j];
		joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
		joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
		if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
			continue;
		joydev->corr[i].coef[2] = (1 << 29) / t;
		joydev->corr[i].coef[3] = (1 << 29) / t;

		joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
	}

	joydev_table[minor] = joydev;

	cdev = class_device_create(&input_class, &dev->cdev,
			MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
			dev->cdev.dev, joydev->name);

	/* temporary symlink to keep userspace happy */
	sysfs_create_link(&input_class.subsys.kobj, &cdev->kobj,
			  joydev->name);

	return &joydev->handle;
}

static void joydev_disconnect(struct input_handle *handle)
{
	struct joydev *joydev = handle->private;
	struct joydev_list *list;

	sysfs_remove_link(&input_class.subsys.kobj, joydev->name);
	class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
	joydev->exist = 0;

	if (joydev->open) {
		input_close_device(handle);
		wake_up_interruptible(&joydev->wait);
		list_for_each_entry(list, &joydev->list, node)
			kill_fasync(&list->fasync, SIGIO, POLL_HUP);
	} else
		joydev_free(joydev);
}

static const struct input_device_id joydev_blacklist[] = {
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
		.evbit = { BIT(EV_KEY) },
		.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
	},	/* Avoid itouchpads, touchscreens and tablets */
	{ }	/* Terminating entry */
};

static const struct input_device_id joydev_ids[] = {
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
		.evbit = { BIT(EV_ABS) },
		.absbit = { BIT(ABS_X) },
	},
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
		.evbit = { BIT(EV_ABS) },
		.absbit = { BIT(ABS_WHEEL) },
	},
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
		.evbit = { BIT(EV_ABS) },
		.absbit = { BIT(ABS_THROTTLE) },
	},
	{ }	/* Terminating entry */
};

MODULE_DEVICE_TABLE(input, joydev_ids);

static struct input_handler joydev_handler = {
	.event =	joydev_event,
	.connect =	joydev_connect,
	.disconnect =	joydev_disconnect,
	.fops =		&joydev_fops,
	.minor =	JOYDEV_MINOR_BASE,
	.name =		"joydev",
	.id_table =	joydev_ids,
	.blacklist =	joydev_blacklist,
};

static int __init joydev_init(void)
{
	return input_register_handler(&joydev_handler);
}

static void __exit joydev_exit(void)
{
	input_unregister_handler(&joydev_handler);
}

module_init(joydev_init);
module_exit(joydev_exit);