summaryrefslogtreecommitdiffstats
path: root/drivers/media/rc/ir-lirc-codec.c
blob: f011c5d9dea18cfec89f130b4eb58374d58c6c03 (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
/* ir-lirc-codec.c - ir-core to classic lirc interface bridge
 *
 * Copyright (C) 2010 by Jarod Wilson <jarod@redhat.com>
 *
 * 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 version 2 of the License.
 *
 *  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.
 */

#include <linux/sched.h>
#include <linux/wait.h>
#include <media/lirc.h>
#include <media/lirc_dev.h>
#include <media/rc-core.h>
#include "rc-core-priv.h"

#define LIRCBUF_SIZE 256

/**
 * ir_lirc_decode() - Send raw IR data to lirc_dev to be relayed to the
 *		      lircd userspace daemon for decoding.
 * @input_dev:	the struct rc_dev descriptor of the device
 * @duration:	the struct ir_raw_event descriptor of the pulse/space
 *
 * This function returns -EINVAL if the lirc interfaces aren't wired up.
 */
static int ir_lirc_decode(struct rc_dev *dev, struct ir_raw_event ev)
{
	struct lirc_codec *lirc = &dev->raw->lirc;
	int sample;

	if (!(dev->raw->enabled_protocols & RC_TYPE_LIRC))
		return 0;

	if (!dev->raw->lirc.drv || !dev->raw->lirc.drv->rbuf)
		return -EINVAL;

	/* Packet start */
	if (ev.reset)
		return 0;

	/* Carrier reports */
	if (ev.carrier_report) {
		sample = LIRC_FREQUENCY(ev.carrier);

	/* Packet end */
	} else if (ev.timeout) {

		if (lirc->gap)
			return 0;

		lirc->gap_start = ktime_get();
		lirc->gap = true;
		lirc->gap_duration = ev.duration;

		if (!lirc->send_timeout_reports)
			return 0;

		sample = LIRC_TIMEOUT(ev.duration / 1000);

	/* Normal sample */
	} else {

		if (lirc->gap) {
			int gap_sample;

			lirc->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
				lirc->gap_start));

			/* Convert to ms and cap by LIRC_VALUE_MASK */
			do_div(lirc->gap_duration, 1000);
			lirc->gap_duration = min(lirc->gap_duration,
							(u64)LIRC_VALUE_MASK);

			gap_sample = LIRC_SPACE(lirc->gap_duration);
			lirc_buffer_write(dev->raw->lirc.drv->rbuf,
						(unsigned char *) &gap_sample);
			lirc->gap = false;
		}

		sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
					LIRC_SPACE(ev.duration / 1000);
	}

	lirc_buffer_write(dev->raw->lirc.drv->rbuf,
			  (unsigned char *) &sample);
	wake_up(&dev->raw->lirc.drv->rbuf->wait_poll);

	return 0;
}

static ssize_t ir_lirc_transmit_ir(struct file *file, const char *buf,
				   size_t n, loff_t *ppos)
{
	struct lirc_codec *lirc;
	struct rc_dev *dev;
	int *txbuf; /* buffer with values to transmit */
	int ret = 0;
	size_t count;

	lirc = lirc_get_pdata(file);
	if (!lirc)
		return -EFAULT;

	if (n % sizeof(int))
		return -EINVAL;

	count = n / sizeof(int);
	if (count > LIRCBUF_SIZE || count % 2 == 0 || n % sizeof(int) != 0)
		return -EINVAL;

	txbuf = memdup_user(buf, n);
	if (IS_ERR(txbuf))
		return PTR_ERR(txbuf);

	dev = lirc->dev;
	if (!dev) {
		ret = -EFAULT;
		goto out;
	}

	if (dev->tx_ir)
		ret = dev->tx_ir(dev, txbuf, (u32)n);

out:
	kfree(txbuf);
	return ret;
}

static long ir_lirc_ioctl(struct file *filep, unsigned int cmd,
			unsigned long __user arg)
{
	struct lirc_codec *lirc;
	struct rc_dev *dev;
	int ret = 0;
	__u32 val = 0, tmp;

	lirc = lirc_get_pdata(filep);
	if (!lirc)
		return -EFAULT;

	dev = lirc->dev;
	if (!dev)
		return -EFAULT;

	if (_IOC_DIR(cmd) & _IOC_WRITE) {
		ret = get_user(val, (__u32 *)arg);
		if (ret)
			return ret;
	}

	switch (cmd) {

	/* legacy support */
	case LIRC_GET_SEND_MODE:
		val = LIRC_CAN_SEND_PULSE & LIRC_CAN_SEND_MASK;
		break;

	case LIRC_SET_SEND_MODE:
		if (val != (LIRC_MODE_PULSE & LIRC_CAN_SEND_MASK))
			return -EINVAL;
		return 0;

	/* TX settings */
	case LIRC_SET_TRANSMITTER_MASK:
		if (!dev->s_tx_mask)
			return -EINVAL;

		return dev->s_tx_mask(dev, val);

	case LIRC_SET_SEND_CARRIER:
		if (!dev->s_tx_carrier)
			return -EINVAL;

		return dev->s_tx_carrier(dev, val);

	case LIRC_SET_SEND_DUTY_CYCLE:
		if (!dev->s_tx_duty_cycle)
			return -ENOSYS;

		if (val <= 0 || val >= 100)
			return -EINVAL;

		return dev->s_tx_duty_cycle(dev, val);

	/* RX settings */
	case LIRC_SET_REC_CARRIER:
		if (!dev->s_rx_carrier_range)
			return -ENOSYS;

		if (val <= 0)
			return -EINVAL;

		return dev->s_rx_carrier_range(dev,
					       dev->raw->lirc.carrier_low,
					       val);

	case LIRC_SET_REC_CARRIER_RANGE:
		if (val <= 0)
			return -EINVAL;

		dev->raw->lirc.carrier_low = val;
		return 0;

	case LIRC_GET_REC_RESOLUTION:
		val = dev->rx_resolution;
		break;

	case LIRC_SET_WIDEBAND_RECEIVER:
		if (!dev->s_learning_mode)
			return -ENOSYS;

		return dev->s_learning_mode(dev, !!val);

	case LIRC_SET_MEASURE_CARRIER_MODE:
		if (!dev->s_carrier_report)
			return -ENOSYS;

		return dev->s_carrier_report(dev, !!val);

	/* Generic timeout support */
	case LIRC_GET_MIN_TIMEOUT:
		if (!dev->max_timeout)
			return -ENOSYS;
		val = dev->min_timeout / 1000;
		break;

	case LIRC_GET_MAX_TIMEOUT:
		if (!dev->max_timeout)
			return -ENOSYS;
		val = dev->max_timeout / 1000;
		break;

	case LIRC_SET_REC_TIMEOUT:
		if (!dev->max_timeout)
			return -ENOSYS;

		tmp = val * 1000;

		if (tmp < dev->min_timeout ||
		    tmp > dev->max_timeout)
				return -EINVAL;

		dev->timeout = tmp;
		break;

	case LIRC_SET_REC_TIMEOUT_REPORTS:
		lirc->send_timeout_reports = !!val;
		break;

	default:
		return lirc_dev_fop_ioctl(filep, cmd, arg);
	}

	if (_IOC_DIR(cmd) & _IOC_READ)
		ret = put_user(val, (__u32 *)arg);

	return ret;
}

static int ir_lirc_open(void *data)
{
	return 0;
}

static void ir_lirc_close(void *data)
{
	return;
}

static struct file_operations lirc_fops = {
	.owner		= THIS_MODULE,
	.write		= ir_lirc_transmit_ir,
	.unlocked_ioctl	= ir_lirc_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ir_lirc_ioctl,
#endif
	.read		= lirc_dev_fop_read,
	.poll		= lirc_dev_fop_poll,
	.open		= lirc_dev_fop_open,
	.release	= lirc_dev_fop_close,
	.llseek		= no_llseek,
};

static int ir_lirc_register(struct rc_dev *dev)
{
	struct lirc_driver *drv;
	struct lirc_buffer *rbuf;
	int rc = -ENOMEM;
	unsigned long features;

	drv = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
	if (!drv)
		return rc;

	rbuf = kzalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
	if (!rbuf)
		goto rbuf_alloc_failed;

	rc = lirc_buffer_init(rbuf, sizeof(int), LIRCBUF_SIZE);
	if (rc)
		goto rbuf_init_failed;

	features = LIRC_CAN_REC_MODE2;
	if (dev->tx_ir) {
		features |= LIRC_CAN_SEND_PULSE;
		if (dev->s_tx_mask)
			features |= LIRC_CAN_SET_TRANSMITTER_MASK;
		if (dev->s_tx_carrier)
			features |= LIRC_CAN_SET_SEND_CARRIER;
		if (dev->s_tx_duty_cycle)
			features |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
	}

	if (dev->s_rx_carrier_range)
		features |= LIRC_CAN_SET_REC_CARRIER |
			LIRC_CAN_SET_REC_CARRIER_RANGE;

	if (dev->s_learning_mode)
		features |= LIRC_CAN_USE_WIDEBAND_RECEIVER;

	if (dev->s_carrier_report)
		features |= LIRC_CAN_MEASURE_CARRIER;

	if (dev->max_timeout)
		features |= LIRC_CAN_SET_REC_TIMEOUT;

	snprintf(drv->name, sizeof(drv->name), "ir-lirc-codec (%s)",
		 dev->driver_name);
	drv->minor = -1;
	drv->features = features;
	drv->data = &dev->raw->lirc;
	drv->rbuf = rbuf;
	drv->set_use_inc = &ir_lirc_open;
	drv->set_use_dec = &ir_lirc_close;
	drv->code_length = sizeof(struct ir_raw_event) * 8;
	drv->fops = &lirc_fops;
	drv->dev = &dev->dev;
	drv->owner = THIS_MODULE;

	drv->minor = lirc_register_driver(drv);
	if (drv->minor < 0) {
		rc = -ENODEV;
		goto lirc_register_failed;
	}

	dev->raw->lirc.drv = drv;
	dev->raw->lirc.dev = dev;
	return 0;

lirc_register_failed:
rbuf_init_failed:
	kfree(rbuf);
rbuf_alloc_failed:
	kfree(drv);

	return rc;
}

static int ir_lirc_unregister(struct rc_dev *dev)
{
	struct lirc_codec *lirc = &dev->raw->lirc;

	lirc_unregister_driver(lirc->drv->minor);
	lirc_buffer_free(lirc->drv->rbuf);
	kfree(lirc->drv);

	return 0;
}

static struct ir_raw_handler lirc_handler = {
	.protocols	= RC_TYPE_LIRC,
	.decode		= ir_lirc_decode,
	.raw_register	= ir_lirc_register,
	.raw_unregister	= ir_lirc_unregister,
};

static int __init ir_lirc_codec_init(void)
{
	ir_raw_handler_register(&lirc_handler);

	printk(KERN_INFO "IR LIRC bridge handler initialized\n");
	return 0;
}

static void __exit ir_lirc_codec_exit(void)
{
	ir_raw_handler_unregister(&lirc_handler);
}

module_init(ir_lirc_codec_init);
module_exit(ir_lirc_codec_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jarod Wilson <jarod@redhat.com>");
MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)");
MODULE_DESCRIPTION("LIRC IR handler bridge");