aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/rc/ir-rx51.c
blob: 546199e9ccc7268f1600a7bc89415b96b10566f2 (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
/*
 *  Copyright (C) 2008 Nokia Corporation
 *
 *  Based on lirc_serial.c
 *
 *  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.
 *
 *  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.
 *
 *  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
 *
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/wait.h>

#include <plat/dmtimer.h>
#include <plat/clock.h>
#include <plat/omap-pm.h>

#include <media/lirc.h>
#include <media/lirc_dev.h>
#include <media/ir-rx51.h>

#define LIRC_RX51_DRIVER_FEATURES (LIRC_CAN_SET_SEND_DUTY_CYCLE |	\
				   LIRC_CAN_SET_SEND_CARRIER |		\
				   LIRC_CAN_SEND_PULSE)

#define DRIVER_NAME "lirc_rx51"

#define WBUF_LEN 256

#define TIMER_MAX_VALUE 0xffffffff

struct lirc_rx51 {
	struct omap_dm_timer *pwm_timer;
	struct omap_dm_timer *pulse_timer;
	struct device	     *dev;
	struct lirc_rx51_platform_data *pdata;
	wait_queue_head_t     wqueue;

	unsigned long	fclk_khz;
	unsigned int	freq;		/* carrier frequency */
	unsigned int	duty_cycle;	/* carrier duty cycle */
	unsigned int	irq_num;
	unsigned int	match;
	int		wbuf[WBUF_LEN];
	int		wbuf_index;
	unsigned long	device_is_open;
	int		pwm_timer_num;
};

static void lirc_rx51_on(struct lirc_rx51 *lirc_rx51)
{
	omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
			      OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE);
}

static void lirc_rx51_off(struct lirc_rx51 *lirc_rx51)
{
	omap_dm_timer_set_pwm(lirc_rx51->pwm_timer, 0, 1,
			      OMAP_TIMER_TRIGGER_NONE);
}

static int init_timing_params(struct lirc_rx51 *lirc_rx51)
{
	u32 load, match;

	load = -(lirc_rx51->fclk_khz * 1000 / lirc_rx51->freq);
	match = -(lirc_rx51->duty_cycle * -load / 100);
	omap_dm_timer_set_load(lirc_rx51->pwm_timer, 1, load);
	omap_dm_timer_set_match(lirc_rx51->pwm_timer, 1, match);
	omap_dm_timer_write_counter(lirc_rx51->pwm_timer, TIMER_MAX_VALUE - 2);
	omap_dm_timer_start(lirc_rx51->pwm_timer);
	omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
	omap_dm_timer_start(lirc_rx51->pulse_timer);

	lirc_rx51->match = 0;

	return 0;
}

#define tics_after(a, b) ((long)(b) - (long)(a) < 0)

static int pulse_timer_set_timeout(struct lirc_rx51 *lirc_rx51, int usec)
{
	int counter;

	BUG_ON(usec < 0);

	if (lirc_rx51->match == 0)
		counter = omap_dm_timer_read_counter(lirc_rx51->pulse_timer);
	else
		counter = lirc_rx51->match;

	counter += (u32)(lirc_rx51->fclk_khz * usec / (1000));
	omap_dm_timer_set_match(lirc_rx51->pulse_timer, 1, counter);
	omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer,
				     OMAP_TIMER_INT_MATCH);
	if (tics_after(omap_dm_timer_read_counter(lirc_rx51->pulse_timer),
		       counter)) {
		return 1;
	}
	return 0;
}

static irqreturn_t lirc_rx51_interrupt_handler(int irq, void *ptr)
{
	unsigned int retval;
	struct lirc_rx51 *lirc_rx51 = ptr;

	retval = omap_dm_timer_read_status(lirc_rx51->pulse_timer);
	if (!retval)
		return IRQ_NONE;

	if (retval & ~OMAP_TIMER_INT_MATCH)
		dev_err_ratelimited(lirc_rx51->dev,
				": Unexpected interrupt source: %x\n", retval);

	omap_dm_timer_write_status(lirc_rx51->pulse_timer,
				OMAP_TIMER_INT_MATCH	|
				OMAP_TIMER_INT_OVERFLOW	|
				OMAP_TIMER_INT_CAPTURE);
	if (lirc_rx51->wbuf_index < 0) {
		dev_err_ratelimited(lirc_rx51->dev,
				": BUG wbuf_index has value of %i\n",
				lirc_rx51->wbuf_index);
		goto end;
	}

	/*
	 * If we happen to hit an odd latency spike, loop through the
	 * pulses until we catch up.
	 */
	do {
		if (lirc_rx51->wbuf_index >= WBUF_LEN)
			goto end;
		if (lirc_rx51->wbuf[lirc_rx51->wbuf_index] == -1)
			goto end;

		if (lirc_rx51->wbuf_index % 2)
			lirc_rx51_off(lirc_rx51);
		else
			lirc_rx51_on(lirc_rx51);

		retval = pulse_timer_set_timeout(lirc_rx51,
					lirc_rx51->wbuf[lirc_rx51->wbuf_index]);
		lirc_rx51->wbuf_index++;

	} while (retval);

	return IRQ_HANDLED;
end:
	/* Stop TX here */
	lirc_rx51_off(lirc_rx51);
	lirc_rx51->wbuf_index = -1;
	omap_dm_timer_stop(lirc_rx51->pwm_timer);
	omap_dm_timer_stop(lirc_rx51->pulse_timer);
	omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
	wake_up_interruptible(&lirc_rx51->wqueue);

	return IRQ_HANDLED;
}

static int lirc_rx51_init_port(struct lirc_rx51 *lirc_rx51)
{
	struct clk *clk_fclk;
	int retval, pwm_timer = lirc_rx51->pwm_timer_num;

	lirc_rx51->pwm_timer = omap_dm_timer_request_specific(pwm_timer);
	if (lirc_rx51->pwm_timer == NULL) {
		dev_err(lirc_rx51->dev, ": Error requesting GPT%d timer\n",
			pwm_timer);
		return -EBUSY;
	}

	lirc_rx51->pulse_timer = omap_dm_timer_request();
	if (lirc_rx51->pulse_timer == NULL) {
		dev_err(lirc_rx51->dev, ": Error requesting pulse timer\n");
		retval = -EBUSY;
		goto err1;
	}

	omap_dm_timer_set_source(lirc_rx51->pwm_timer, OMAP_TIMER_SRC_SYS_CLK);
	omap_dm_timer_set_source(lirc_rx51->pulse_timer,
				OMAP_TIMER_SRC_SYS_CLK);

	omap_dm_timer_enable(lirc_rx51->pwm_timer);
	omap_dm_timer_enable(lirc_rx51->pulse_timer);

	lirc_rx51->irq_num = omap_dm_timer_get_irq(lirc_rx51->pulse_timer);
	retval = request_irq(lirc_rx51->irq_num, lirc_rx51_interrupt_handler,
			     IRQF_DISABLED | IRQF_SHARED,
			     "lirc_pulse_timer", lirc_rx51);
	if (retval) {
		dev_err(lirc_rx51->dev, ": Failed to request interrupt line\n");
		goto err2;
	}

	clk_fclk = omap_dm_timer_get_fclk(lirc_rx51->pwm_timer);
	lirc_rx51->fclk_khz = clk_fclk->rate / 1000;

	return 0;

err2:
	omap_dm_timer_free(lirc_rx51->pulse_timer);
err1:
	omap_dm_timer_free(lirc_rx51->pwm_timer);

	return retval;
}

static int lirc_rx51_free_port(struct lirc_rx51 *lirc_rx51)
{
	omap_dm_timer_set_int_enable(lirc_rx51->pulse_timer, 0);
	free_irq(lirc_rx51->irq_num, lirc_rx51);
	lirc_rx51_off(lirc_rx51);
	omap_dm_timer_disable(lirc_rx51->pwm_timer);
	omap_dm_timer_disable(lirc_rx51->pulse_timer);
	omap_dm_timer_free(lirc_rx51->pwm_timer);
	omap_dm_timer_free(lirc_rx51->pulse_timer);
	lirc_rx51->wbuf_index = -1;

	return 0;
}

static ssize_t lirc_rx51_write(struct file *file, const char *buf,
			  size_t n, loff_t *ppos)
{
	int count, i;
	struct lirc_rx51 *lirc_rx51 = file->private_data;

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

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

	/* Wait any pending transfers to finish */
	wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);

	if (copy_from_user(lirc_rx51->wbuf, buf, n))
		return -EFAULT;

	/* Sanity check the input pulses */
	for (i = 0; i < count; i++)
		if (lirc_rx51->wbuf[i] < 0)
			return -EINVAL;

	init_timing_params(lirc_rx51);
	if (count < WBUF_LEN)
		lirc_rx51->wbuf[count] = -1; /* Insert termination mark */

	/*
	 * Adjust latency requirements so the device doesn't go in too
	 * deep sleep states
	 */
	lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, 50);

	lirc_rx51_on(lirc_rx51);
	lirc_rx51->wbuf_index = 1;
	pulse_timer_set_timeout(lirc_rx51, lirc_rx51->wbuf[0]);

	/*
	 * Don't return back to the userspace until the transfer has
	 * finished
	 */
	wait_event_interruptible(lirc_rx51->wqueue, lirc_rx51->wbuf_index < 0);

	/* We can sleep again */
	lirc_rx51->pdata->set_max_mpu_wakeup_lat(lirc_rx51->dev, -1);

	return n;
}

static long lirc_rx51_ioctl(struct file *filep,
			unsigned int cmd, unsigned long arg)
{
	int result;
	unsigned long value;
	unsigned int ivalue;
	struct lirc_rx51 *lirc_rx51 = filep->private_data;

	switch (cmd) {
	case LIRC_GET_SEND_MODE:
		result = put_user(LIRC_MODE_PULSE, (unsigned long *)arg);
		if (result)
			return result;
		break;

	case LIRC_SET_SEND_MODE:
		result = get_user(value, (unsigned long *)arg);
		if (result)
			return result;

		/* only LIRC_MODE_PULSE supported */
		if (value != LIRC_MODE_PULSE)
			return -ENOSYS;
		break;

	case LIRC_GET_REC_MODE:
		result = put_user(0, (unsigned long *) arg);
		if (result)
			return result;
		break;

	case LIRC_GET_LENGTH:
		return -ENOSYS;
		break;

	case LIRC_SET_SEND_DUTY_CYCLE:
		result = get_user(ivalue, (unsigned int *) arg);
		if (result)
			return result;

		if (ivalue <= 0 || ivalue > 100) {
			dev_err(lirc_rx51->dev, ": invalid duty cycle %d\n",
				ivalue);
			return -EINVAL;
		}

		lirc_rx51->duty_cycle = ivalue;
		break;

	case LIRC_SET_SEND_CARRIER:
		result = get_user(ivalue, (unsigned int *) arg);
		if (result)
			return result;

		if (ivalue > 500000 || ivalue < 20000) {
			dev_err(lirc_rx51->dev, ": invalid carrier freq %d\n",
				ivalue);
			return -EINVAL;
		}

		lirc_rx51->freq = ivalue;
		break;

	case LIRC_GET_FEATURES:
		result = put_user(LIRC_RX51_DRIVER_FEATURES,
				  (unsigned long *) arg);
		if (result)
			return result;
		break;

	default:
		return -ENOIOCTLCMD;
	}

	return 0;
}

static int lirc_rx51_open(struct inode *inode, struct file *file)
{
	struct lirc_rx51 *lirc_rx51 = lirc_get_pdata(file);
	BUG_ON(!lirc_rx51);

	file->private_data = lirc_rx51;

	if (test_and_set_bit(1, &lirc_rx51->device_is_open))
		return -EBUSY;

	return lirc_rx51_init_port(lirc_rx51);
}

static int lirc_rx51_release(struct inode *inode, struct file *file)
{
	struct lirc_rx51 *lirc_rx51 = file->private_data;

	lirc_rx51_free_port(lirc_rx51);

	clear_bit(1, &lirc_rx51->device_is_open);

	return 0;
}

static struct lirc_rx51 lirc_rx51 = {
	.freq		= 38000,
	.duty_cycle	= 50,
	.wbuf_index	= -1,
};

static const struct file_operations lirc_fops = {
	.owner		= THIS_MODULE,
	.write		= lirc_rx51_write,
	.unlocked_ioctl	= lirc_rx51_ioctl,
	.read		= lirc_dev_fop_read,
	.poll		= lirc_dev_fop_poll,
	.open		= lirc_rx51_open,
	.release	= lirc_rx51_release,
};

static struct lirc_driver lirc_rx51_driver = {
	.name		= DRIVER_NAME,
	.minor		= -1,
	.code_length	= 1,
	.data		= &lirc_rx51,
	.fops		= &lirc_fops,
	.owner		= THIS_MODULE,
};

#ifdef CONFIG_PM

static int lirc_rx51_suspend(struct platform_device *dev, pm_message_t state)
{
	/*
	 * In case the device is still open, do not suspend. Normally
	 * this should not be a problem as lircd only keeps the device
	 * open only for short periods of time. We also don't want to
	 * get involved with race conditions that might happen if we
	 * were in a middle of a transmit. Thus, we defer any suspend
	 * actions until transmit has completed.
	 */
	if (test_and_set_bit(1, &lirc_rx51.device_is_open))
		return -EAGAIN;

	clear_bit(1, &lirc_rx51.device_is_open);

	return 0;
}

static int lirc_rx51_resume(struct platform_device *dev)
{
	return 0;
}

#else

#define lirc_rx51_suspend	NULL
#define lirc_rx51_resume	NULL

#endif /* CONFIG_PM */

static int __devinit lirc_rx51_probe(struct platform_device *dev)
{
	lirc_rx51_driver.features = LIRC_RX51_DRIVER_FEATURES;
	lirc_rx51.pdata = dev->dev.platform_data;
	lirc_rx51.pwm_timer_num = lirc_rx51.pdata->pwm_timer;
	lirc_rx51.dev = &dev->dev;
	lirc_rx51_driver.dev = &dev->dev;
	lirc_rx51_driver.minor = lirc_register_driver(&lirc_rx51_driver);
	init_waitqueue_head(&lirc_rx51.wqueue);

	if (lirc_rx51_driver.minor < 0) {
		dev_err(lirc_rx51.dev, ": lirc_register_driver failed: %d\n",
		       lirc_rx51_driver.minor);
		return lirc_rx51_driver.minor;
	}
	dev_info(lirc_rx51.dev, "registration ok, minor: %d, pwm: %d\n",
		 lirc_rx51_driver.minor, lirc_rx51.pwm_timer_num);

	return 0;
}

static int __exit lirc_rx51_remove(struct platform_device *dev)
{
	return lirc_unregister_driver(lirc_rx51_driver.minor);
}

struct platform_driver lirc_rx51_platform_driver = {
	.probe		= lirc_rx51_probe,
	.remove		= __exit_p(lirc_rx51_remove),
	.suspend	= lirc_rx51_suspend,
	.resume		= lirc_rx51_resume,
	.driver		= {
		.name	= DRIVER_NAME,
		.owner	= THIS_MODULE,
	},
};

static int __init lirc_rx51_init(void)
{
	return platform_driver_register(&lirc_rx51_platform_driver);
}
module_init(lirc_rx51_init);

static void __exit lirc_rx51_exit(void)
{
	platform_driver_unregister(&lirc_rx51_platform_driver);
}
module_exit(lirc_rx51_exit);

MODULE_DESCRIPTION("LIRC TX driver for Nokia RX51");
MODULE_AUTHOR("Nokia Corporation");
MODULE_LICENSE("GPL");