summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/wl128x/fmdrv_v4l2.c
blob: 080b96a61f1a41783e8d7025e63722fb94ceeb0e (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
/*
 *  FM Driver for Connectivity chip of Texas Instruments.
 *  This file provides interfaces to V4L2 subsystem.
 *
 *  This module registers with V4L2 subsystem as Radio
 *  data system interface (/dev/radio). During the registration,
 *  it will expose two set of function pointers.
 *
 *    1) File operation related API (open, close, read, write, poll...etc).
 *    2) Set of V4L2 IOCTL complaint API.
 *
 *  Copyright (C) 2011 Texas Instruments
 *  Author: Raja Mani <raja_mani@ti.com>
 *  Author: Manjunatha Halli <manjunatha_halli@ti.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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/export.h>

#include "fmdrv.h"
#include "fmdrv_v4l2.h"
#include "fmdrv_common.h"
#include "fmdrv_rx.h"
#include "fmdrv_tx.h"

static struct video_device *gradio_dev;
static u8 radio_disconnected;

/* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */

/* Read RX RDS data */
static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,
					size_t count, loff_t *ppos)
{
	u8 rds_mode;
	int ret;
	struct fmdev *fmdev;

	fmdev = video_drvdata(file);

	if (!radio_disconnected) {
		fmerr("FM device is already disconnected\n");
		return -EIO;
	}

	/* Turn on RDS mode , if it is disabled */
	ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
	if (ret < 0) {
		fmerr("Unable to read current rds mode\n");
		return ret;
	}

	if (rds_mode == FM_RDS_DISABLE) {
		ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
		if (ret < 0) {
			fmerr("Failed to enable rds mode\n");
			return ret;
		}
	}

	/* Copy RDS data from internal buffer to user buffer */
	return fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
}

/* Write TX RDS data */
static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
		size_t count, loff_t *ppos)
{
	struct tx_rds rds;
	int ret;
	struct fmdev *fmdev;

	ret = copy_from_user(&rds, buf, sizeof(rds));
	rds.text[sizeof(rds.text) - 1] = '\0';
	fmdbg("(%d)type: %d, text %s, af %d\n",
		   ret, rds.text_type, rds.text, rds.af_freq);
	if (ret)
		return -EFAULT;

	fmdev = video_drvdata(file);
	fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
	fm_tx_set_af(fmdev, rds.af_freq);

	return sizeof(rds);
}

static u32 fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
{
	int ret;
	struct fmdev *fmdev;

	fmdev = video_drvdata(file);
	ret = fmc_is_rds_data_available(fmdev, file, pts);
	if (ret < 0)
		return POLLIN | POLLRDNORM;

	return 0;
}

/*
 * Handle open request for "/dev/radioX" device.
 * Start with FM RX mode as default.
 */
static int fm_v4l2_fops_open(struct file *file)
{
	int ret;
	struct fmdev *fmdev = NULL;

	/* Don't allow multiple open */
	if (radio_disconnected) {
		fmerr("FM device is already opened\n");
		return -EBUSY;
	}

	fmdev = video_drvdata(file);

	ret = fmc_prepare(fmdev);
	if (ret < 0) {
		fmerr("Unable to prepare FM CORE\n");
		return ret;
	}

	fmdbg("Load FM RX firmware..\n");

	ret = fmc_set_mode(fmdev, FM_MODE_RX);
	if (ret < 0) {
		fmerr("Unable to load FM RX firmware\n");
		return ret;
	}
	radio_disconnected = 1;

	return ret;
}

static int fm_v4l2_fops_release(struct file *file)
{
	int ret;
	struct fmdev *fmdev;

	fmdev = video_drvdata(file);
	if (!radio_disconnected) {
		fmdbg("FM device is already closed\n");
		return 0;
	}

	ret = fmc_set_mode(fmdev, FM_MODE_OFF);
	if (ret < 0) {
		fmerr("Unable to turn off the chip\n");
		return ret;
	}

	ret = fmc_release(fmdev);
	if (ret < 0) {
		fmerr("FM CORE release failed\n");
		return ret;
	}
	radio_disconnected = 0;

	return ret;
}

/* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
		struct v4l2_capability *capability)
{
	strlcpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
	strlcpy(capability->card, FM_DRV_CARD_SHORT_NAME,
			sizeof(capability->card));
	sprintf(capability->bus_info, "UART");
	capability->capabilities = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER |
		V4L2_CAP_RADIO | V4L2_CAP_MODULATOR |
		V4L2_CAP_AUDIO | V4L2_CAP_READWRITE |
		V4L2_CAP_RDS_CAPTURE;

	return 0;
}

static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
	struct fmdev *fmdev = container_of(ctrl->handler,
			struct fmdev, ctrl_handler);

	switch (ctrl->id) {
	case  V4L2_CID_TUNE_ANTENNA_CAPACITOR:
		ctrl->val = fm_tx_get_tune_cap_val(fmdev);
		break;
	default:
		fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
		break;
	}

	return 0;
}

static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct fmdev *fmdev = container_of(ctrl->handler,
			struct fmdev, ctrl_handler);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME:	/* set volume */
		return fm_rx_set_volume(fmdev, (u16)ctrl->val);

	case V4L2_CID_AUDIO_MUTE:	/* set mute */
		return fmc_set_mute_mode(fmdev, (u8)ctrl->val);

	case V4L2_CID_TUNE_POWER_LEVEL:
		/* set TX power level - ext control */
		return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);

	case V4L2_CID_TUNE_PREEMPHASIS:
		return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);

	default:
		return -EINVAL;
	}
}

static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
		struct v4l2_audio *audio)
{
	memset(audio, 0, sizeof(*audio));
	strcpy(audio->name, "Radio");
	audio->capability = V4L2_AUDCAP_STEREO;

	return 0;
}

static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
		struct v4l2_audio *audio)
{
	if (audio->index != 0)
		return -EINVAL;

	return 0;
}

/* Get tuner attributes. If current mode is NOT RX, return error */
static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
		struct v4l2_tuner *tuner)
{
	struct fmdev *fmdev = video_drvdata(file);
	u32 bottom_freq;
	u32 top_freq;
	u16 stereo_mono_mode;
	u16 rssilvl;
	int ret;

	if (tuner->index != 0)
		return -EINVAL;

	if (fmdev->curr_fmmode != FM_MODE_RX)
		return -EPERM;

	ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
	if (ret != 0)
		return ret;

	ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
	if (ret != 0)
		return ret;

	ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
	if (ret != 0)
		return ret;

	strcpy(tuner->name, "FM");
	tuner->type = V4L2_TUNER_RADIO;
	/* Store rangelow and rangehigh freq in unit of 62.5 Hz */
	tuner->rangelow = bottom_freq * 16;
	tuner->rangehigh = top_freq * 16;
	tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
	((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
	tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
			    V4L2_TUNER_CAP_LOW;
	tuner->audmode = (stereo_mono_mode ?
			  V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);

	/*
	 * Actual rssi value lies in between -128 to +127.
	 * Convert this range from 0 to 255 by adding +128
	 */
	rssilvl += 128;

	/*
	 * Return signal strength value should be within 0 to 65535.
	 * Find out correct signal radio by multiplying (65535/255) = 257
	 */
	tuner->signal = rssilvl * 257;
	tuner->afc = 0;

	return ret;
}

/*
 * Set tuner attributes. If current mode is NOT RX, set to RX.
 * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
 * Should we set other tuner attributes, too?
 */
static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
		struct v4l2_tuner *tuner)
{
	struct fmdev *fmdev = video_drvdata(file);
	u16 aud_mode;
	u8 rds_mode;
	int ret;

	if (tuner->index != 0)
		return -EINVAL;

	aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
			FM_STEREO_MODE : FM_MONO_MODE;
	rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
			FM_RDS_ENABLE : FM_RDS_DISABLE;

	if (fmdev->curr_fmmode != FM_MODE_RX) {
		ret = fmc_set_mode(fmdev, FM_MODE_RX);
		if (ret < 0) {
			fmerr("Failed to set RX mode\n");
			return ret;
		}
	}

	ret = fmc_set_stereo_mono(fmdev, aud_mode);
	if (ret < 0) {
		fmerr("Failed to set RX stereo/mono mode\n");
		return ret;
	}

	ret = fmc_set_rds_mode(fmdev, rds_mode);
	if (ret < 0)
		fmerr("Failed to set RX RDS mode\n");

	return ret;
}

/* Get tuner or modulator radio frequency */
static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
		struct v4l2_frequency *freq)
{
	struct fmdev *fmdev = video_drvdata(file);
	int ret;

	ret = fmc_get_freq(fmdev, &freq->frequency);
	if (ret < 0) {
		fmerr("Failed to get frequency\n");
		return ret;
	}

	/* Frequency unit of 62.5 Hz*/
	freq->frequency = (u32) freq->frequency * 16;

	return 0;
}

/* Set tuner or modulator radio frequency */
static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
		struct v4l2_frequency *freq)
{
	struct fmdev *fmdev = video_drvdata(file);

	/*
	 * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
	 * in units of 62.5 Hz.
	 */
	freq->frequency = (u32)(freq->frequency / 16);

	return fmc_set_freq(fmdev, freq->frequency);
}

/* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
		struct v4l2_hw_freq_seek *seek)
{
	struct fmdev *fmdev = video_drvdata(file);
	int ret;

	if (fmdev->curr_fmmode != FM_MODE_RX) {
		ret = fmc_set_mode(fmdev, FM_MODE_RX);
		if (ret != 0) {
			fmerr("Failed to set RX mode\n");
			return ret;
		}
	}

	ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
			seek->spacing);
	if (ret < 0)
		fmerr("RX seek failed - %d\n", ret);

	return ret;
}
/* Get modulator attributes. If mode is not TX, return no attributes. */
static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
		struct v4l2_modulator *mod)
{
	struct fmdev *fmdev = video_drvdata(file);

	if (mod->index != 0)
		return -EINVAL;

	if (fmdev->curr_fmmode != FM_MODE_TX)
		return -EPERM;

	mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
				V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
				((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
				V4L2_TUNER_SUB_RDS : 0);

	mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
				V4L2_TUNER_CAP_LOW;

	return 0;
}

/* Set modulator attributes. If mode is not TX, set to TX. */
static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
		struct v4l2_modulator *mod)
{
	struct fmdev *fmdev = video_drvdata(file);
	u8 rds_mode;
	u16 aud_mode;
	int ret;

	if (mod->index != 0)
		return -EINVAL;

	if (fmdev->curr_fmmode != FM_MODE_TX) {
		ret = fmc_set_mode(fmdev, FM_MODE_TX);
		if (ret != 0) {
			fmerr("Failed to set TX mode\n");
			return ret;
		}
	}

	aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
			FM_STEREO_MODE : FM_MONO_MODE;
	rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
			FM_RDS_ENABLE : FM_RDS_DISABLE;
	ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
	if (ret < 0) {
		fmerr("Failed to set mono/stereo mode for TX\n");
		return ret;
	}
	ret = fm_tx_set_rds_mode(fmdev, rds_mode);
	if (ret < 0)
		fmerr("Failed to set rds mode for TX\n");

	return ret;
}

static const struct v4l2_file_operations fm_drv_fops = {
	.owner = THIS_MODULE,
	.read = fm_v4l2_fops_read,
	.write = fm_v4l2_fops_write,
	.poll = fm_v4l2_fops_poll,
	.unlocked_ioctl = video_ioctl2,
	.open = fm_v4l2_fops_open,
	.release = fm_v4l2_fops_release,
};

static const struct v4l2_ctrl_ops fm_ctrl_ops = {
	.s_ctrl = fm_v4l2_s_ctrl,
	.g_volatile_ctrl = fm_g_volatile_ctrl,
};
static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
	.vidioc_querycap = fm_v4l2_vidioc_querycap,
	.vidioc_g_audio = fm_v4l2_vidioc_g_audio,
	.vidioc_s_audio = fm_v4l2_vidioc_s_audio,
	.vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
	.vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
	.vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
	.vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
	.vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
	.vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
	.vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
};

/* V4L2 RADIO device parent structure */
static struct video_device fm_viddev_template = {
	.fops = &fm_drv_fops,
	.ioctl_ops = &fm_drv_ioctl_ops,
	.name = FM_DRV_NAME,
	.release = video_device_release,
};

int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
{
	struct v4l2_ctrl *ctrl;
	int ret;

	/* Init mutex for core locking */
	mutex_init(&fmdev->mutex);

	/* Allocate new video device */
	gradio_dev = video_device_alloc();
	if (NULL == gradio_dev) {
		fmerr("Can't allocate video device\n");
		return -ENOMEM;
	}

	/* Setup FM driver's V4L2 properties */
	memcpy(gradio_dev, &fm_viddev_template, sizeof(fm_viddev_template));

	video_set_drvdata(gradio_dev, fmdev);

	gradio_dev->lock = &fmdev->mutex;
	/* Locking in file operations other than ioctl should be done
	   by the driver, not the V4L2 core.
	   This driver needs auditing so that this flag can be removed. */
	set_bit(V4L2_FL_LOCK_ALL_FOPS, &gradio_dev->flags);

	/* Register with V4L2 subsystem as RADIO device */
	if (video_register_device(gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
		video_device_release(gradio_dev);
		fmerr("Could not register video device\n");
		return -ENOMEM;
	}

	fmdev->radio_dev = gradio_dev;

	/* Register to v4l2 ctrl handler framework */
	fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;

	ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
	if (ret < 0) {
		fmerr("(fmdev): Can't init ctrl handler\n");
		v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
		return -EBUSY;
	}

	/*
	 * Following controls are handled by V4L2 control framework.
	 * Added in ascending ID order.
	 */
	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
			V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
			FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);

	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);

	v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
			V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
			0, V4L2_PREEMPHASIS_75_uS);

	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
			V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
			FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);

	ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
			V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
			255, 1, 255);

	if (ctrl)
		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;

	return 0;
}

void *fm_v4l2_deinit_video_device(void)
{
	struct fmdev *fmdev;


	fmdev = video_get_drvdata(gradio_dev);

	/* Unregister to v4l2 ctrl handler framework*/
	v4l2_ctrl_handler_free(&fmdev->ctrl_handler);

	/* Unregister RADIO device from V4L2 subsystem */
	video_unregister_device(gradio_dev);

	return fmdev;
}
OpenPOWER on IntegriCloud