summaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-tea5777.c
blob: 3e12179364f8462dd47d850f2bb2fe4285f8f280 (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
/*
 *   v4l2 driver for TEA5777 Philips AM/FM radio tuner chips
 *
 *	Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
 *
 *   Based on the ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips:
 *
 *	Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
 *
 *   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/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include "radio-tea5777.h"

MODULE_AUTHOR("Hans de Goede <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of TEA5777 Philips AM/FM radio tuner chips");
MODULE_LICENSE("GPL");

/* Fixed FM only band for now, will implement multi-band support when the
   VIDIOC_ENUM_FREQ_BANDS API is upstream */
#define TEA5777_FM_RANGELOW		(76000 * 16)
#define TEA5777_FM_RANGEHIGH		(108000 * 16)

#define TEA5777_FM_IF			150 /* kHz */
#define TEA5777_FM_FREQ_STEP		50 /* kHz */

/* Write reg, common bits */
#define TEA5777_W_MUTE_MASK		(1LL << 47)
#define TEA5777_W_MUTE_SHIFT		47
#define TEA5777_W_AM_FM_MASK		(1LL << 46)
#define TEA5777_W_AM_FM_SHIFT		46
#define TEA5777_W_STB_MASK		(1LL << 45)
#define TEA5777_W_STB_SHIFT		45

#define TEA5777_W_IFCE_MASK		(1LL << 29)
#define TEA5777_W_IFCE_SHIFT		29
#define TEA5777_W_IFW_MASK		(1LL << 28)
#define TEA5777_W_IFW_SHIFT		28
#define TEA5777_W_HILO_MASK		(1LL << 27)
#define TEA5777_W_HILO_SHIFT		27
#define TEA5777_W_DBUS_MASK		(1LL << 26)
#define TEA5777_W_DBUS_SHIFT		26

#define TEA5777_W_INTEXT_MASK		(1LL << 24)
#define TEA5777_W_INTEXT_SHIFT		24
#define TEA5777_W_P1_MASK		(1LL << 23)
#define TEA5777_W_P1_SHIFT		23
#define TEA5777_W_P0_MASK		(1LL << 22)
#define TEA5777_W_P0_SHIFT		22
#define TEA5777_W_PEN1_MASK		(1LL << 21)
#define TEA5777_W_PEN1_SHIFT		21
#define TEA5777_W_PEN0_MASK		(1LL << 20)
#define TEA5777_W_PEN0_SHIFT		20

#define TEA5777_W_CHP0_MASK		(1LL << 18)
#define TEA5777_W_CHP0_SHIFT		18
#define TEA5777_W_DEEM_MASK		(1LL << 17)
#define TEA5777_W_DEEM_SHIFT		17

#define TEA5777_W_SEARCH_MASK		(1LL << 7)
#define TEA5777_W_SEARCH_SHIFT		7
#define TEA5777_W_PROGBLIM_MASK		(1LL << 6)
#define TEA5777_W_PROGBLIM_SHIFT	6
#define TEA5777_W_UPDWN_MASK		(1LL << 5)
#define TEA5777_W_UPDWN_SHIFT		5
#define TEA5777_W_SLEV_MASK		(3LL << 3)
#define TEA5777_W_SLEV_SHIFT		3

/* Write reg, FM specific bits */
#define TEA5777_W_FM_PLL_MASK		(0x1fffLL << 32)
#define TEA5777_W_FM_PLL_SHIFT		32
#define TEA5777_W_FM_FREF_MASK		(0x03LL << 30)
#define TEA5777_W_FM_FREF_SHIFT		30
#define TEA5777_W_FM_FREF_VALUE		0 /* 50 kHz tune steps, 150 kHz IF */

#define TEA5777_W_FM_FORCEMONO_MASK	(1LL << 15)
#define TEA5777_W_FM_FORCEMONO_SHIFT	15
#define TEA5777_W_FM_SDSOFF_MASK	(1LL << 14)
#define TEA5777_W_FM_SDSOFF_SHIFT	14
#define TEA5777_W_FM_DOFF_MASK		(1LL << 13)
#define TEA5777_W_FM_DOFF_SHIFT		13

#define TEA5777_W_FM_STEP_MASK		(3LL << 1)
#define TEA5777_W_FM_STEP_SHIFT		1

/* Write reg, AM specific bits */
#define TEA5777_W_AM_PLL_MASK		(0x7ffLL << 34)
#define TEA5777_W_AM_PLL_SHIFT		34
#define TEA5777_W_AM_AGCRF_MASK		(1LL << 33)
#define TEA5777_W_AM_AGCRF_SHIFT	33
#define TEA5777_W_AM_AGCIF_MASK		(1LL << 32)
#define TEA5777_W_AM_AGCIF_SHIFT	32
#define TEA5777_W_AM_MWLW_MASK		(1LL << 31)
#define TEA5777_W_AM_MWLW_SHIFT		31
#define TEA5777_W_AM_LNA_MASK		(1LL << 30)
#define TEA5777_W_AM_LNA_SHIFT		30

#define TEA5777_W_AM_PEAK_MASK		(1LL << 25)
#define TEA5777_W_AM_PEAK_SHIFT		25

#define TEA5777_W_AM_RFB_MASK		(1LL << 16)
#define TEA5777_W_AM_RFB_SHIFT		16
#define TEA5777_W_AM_CALLIGN_MASK	(1LL << 15)
#define TEA5777_W_AM_CALLIGN_SHIFT	15
#define TEA5777_W_AM_CBANK_MASK		(0x7fLL << 8)
#define TEA5777_W_AM_CBANK_SHIFT	8

#define TEA5777_W_AM_DELAY_MASK		(1LL << 2)
#define TEA5777_W_AM_DELAY_SHIFT	2
#define TEA5777_W_AM_STEP_MASK		(1LL << 1)
#define TEA5777_W_AM_STEP_SHIFT		1

/* Read reg, common bits */
#define TEA5777_R_LEVEL_MASK		(0x0f << 17)
#define TEA5777_R_LEVEL_SHIFT		17
#define TEA5777_R_SFOUND_MASK		(0x01 << 16)
#define TEA5777_R_SFOUND_SHIFT		16
#define TEA5777_R_BLIM_MASK		(0x01 << 15)
#define TEA5777_R_BLIM_SHIFT		15

/* Read reg, FM specific bits */
#define TEA5777_R_FM_STEREO_MASK	(0x01 << 21)
#define TEA5777_R_FM_STEREO_SHIFT	21
#define TEA5777_R_FM_PLL_MASK		0x1fff
#define TEA5777_R_FM_PLL_SHIFT		0

static u32 tea5777_freq_to_v4l2_freq(struct radio_tea5777 *tea, u32 freq)
{
	return (freq * TEA5777_FM_FREQ_STEP + TEA5777_FM_IF) * 16;
}

static int radio_tea5777_set_freq(struct radio_tea5777 *tea)
{
	u64 freq;
	int res;

	freq = clamp_t(u32, tea->freq,
		       TEA5777_FM_RANGELOW, TEA5777_FM_RANGEHIGH);
	freq = (freq + 8) / 16; /* to kHz */

	freq = (freq - TEA5777_FM_IF) / TEA5777_FM_FREQ_STEP;

	tea->write_reg &= ~(TEA5777_W_FM_PLL_MASK | TEA5777_W_FM_FREF_MASK);
	tea->write_reg |= freq << TEA5777_W_FM_PLL_SHIFT;
	tea->write_reg |= TEA5777_W_FM_FREF_VALUE << TEA5777_W_FM_FREF_SHIFT;

	res = tea->ops->write_reg(tea, tea->write_reg);
	if (res)
		return res;

	tea->needs_write = false;
	tea->read_reg = -1;
	tea->freq = tea5777_freq_to_v4l2_freq(tea, freq);

	return 0;
}

static int radio_tea5777_update_read_reg(struct radio_tea5777 *tea, int wait)
{
	int res;

	if (tea->read_reg != -1)
		return 0;

	if (tea->write_before_read && tea->needs_write) {
		res = radio_tea5777_set_freq(tea);
		if (res)
			return res;
	}

	if (wait) {
		if (schedule_timeout_interruptible(msecs_to_jiffies(wait)))
			return -ERESTARTSYS;
	}

	res = tea->ops->read_reg(tea, &tea->read_reg);
	if (res)
		return res;

	tea->needs_write = true;
	return 0;
}

/*
 * Linux Video interface
 */

static int vidioc_querycap(struct file *file, void  *priv,
					struct v4l2_capability *v)
{
	struct radio_tea5777 *tea = video_drvdata(file);

	strlcpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
	strlcpy(v->card, tea->card, sizeof(v->card));
	strlcat(v->card, " TEA5777", sizeof(v->card));
	strlcpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
	v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
	v->device_caps |= V4L2_CAP_HW_FREQ_SEEK;
	v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
	return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
					struct v4l2_tuner *v)
{
	struct radio_tea5777 *tea = video_drvdata(file);
	int res;

	if (v->index > 0)
		return -EINVAL;

	res = radio_tea5777_update_read_reg(tea, 0);
	if (res)
		return res;

	memset(v, 0, sizeof(*v));
	if (tea->has_am)
		strlcpy(v->name, "AM/FM", sizeof(v->name));
	else
		strlcpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;
	v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
			V4L2_TUNER_CAP_HWSEEK_BOUNDED;
	v->rangelow   = TEA5777_FM_RANGELOW;
	v->rangehigh  = TEA5777_FM_RANGEHIGH;
	v->rxsubchans = (tea->read_reg & TEA5777_R_FM_STEREO_MASK) ?
			V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
	v->audmode = (tea->write_reg & TEA5777_W_FM_FORCEMONO_MASK) ?
		V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
	/* shift - 12 to convert 4-bits (0-15) scale to 16-bits (0-65535) */
	v->signal = (tea->read_reg & TEA5777_R_LEVEL_MASK) >>
		    (TEA5777_R_LEVEL_SHIFT - 12);

	/* Invalidate read_reg, so that next call we return up2date signal */
	tea->read_reg = -1;

	return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
					struct v4l2_tuner *v)
{
	struct radio_tea5777 *tea = video_drvdata(file);

	if (v->index)
		return -EINVAL;

	if (v->audmode == V4L2_TUNER_MODE_MONO)
		tea->write_reg |= TEA5777_W_FM_FORCEMONO_MASK;
	else
		tea->write_reg &= ~TEA5777_W_FM_FORCEMONO_MASK;

	return radio_tea5777_set_freq(tea);
}

static int vidioc_g_frequency(struct file *file, void *priv,
					struct v4l2_frequency *f)
{
	struct radio_tea5777 *tea = video_drvdata(file);

	if (f->tuner != 0)
		return -EINVAL;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = tea->freq;
	return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
					struct v4l2_frequency *f)
{
	struct radio_tea5777 *tea = video_drvdata(file);

	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
		return -EINVAL;

	tea->freq = f->frequency;
	return radio_tea5777_set_freq(tea);
}

static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
					struct v4l2_hw_freq_seek *a)
{
	struct radio_tea5777 *tea = video_drvdata(file);
	u32 orig_freq = tea->freq;
	unsigned long timeout;
	int res, spacing = 200 * 16; /* 200 kHz */
	/* These are fixed *for now* */
	const u32 seek_rangelow  = TEA5777_FM_RANGELOW;
	const u32 seek_rangehigh = TEA5777_FM_RANGEHIGH;

	if (a->tuner || a->wrap_around)
		return -EINVAL;

	tea->write_reg |= TEA5777_W_PROGBLIM_MASK;
	if (seek_rangelow != tea->seek_rangelow) {
		tea->write_reg &= ~TEA5777_W_UPDWN_MASK;
		tea->freq = seek_rangelow;
		res = radio_tea5777_set_freq(tea);
		if (res)
			goto leave;
		tea->seek_rangelow = tea->freq;
	}
	if (seek_rangehigh != tea->seek_rangehigh) {
		tea->write_reg |= TEA5777_W_UPDWN_MASK;
		tea->freq = seek_rangehigh;
		res = radio_tea5777_set_freq(tea);
		if (res)
			goto leave;
		tea->seek_rangehigh = tea->freq;
	}
	tea->write_reg &= ~TEA5777_W_PROGBLIM_MASK;

	tea->write_reg |= TEA5777_W_SEARCH_MASK;
	if (a->seek_upward) {
		tea->write_reg |= TEA5777_W_UPDWN_MASK;
		tea->freq = orig_freq + spacing;
	} else {
		tea->write_reg &= ~TEA5777_W_UPDWN_MASK;
		tea->freq = orig_freq - spacing;
	}
	res = radio_tea5777_set_freq(tea);
	if (res)
		goto leave;

	timeout = jiffies + msecs_to_jiffies(5000);
	for (;;) {
		if (time_after(jiffies, timeout)) {
			res = -ENODATA;
			break;
		}

		res = radio_tea5777_update_read_reg(tea, 100);
		if (res)
			break;

		/*
		 * Note we use tea->freq to track how far we've searched sofar
		 * this is necessary to ensure we continue seeking at the right
		 * point, in the write_before_read case.
		 */
		tea->freq = (tea->read_reg & TEA5777_R_FM_PLL_MASK);
		tea->freq = tea5777_freq_to_v4l2_freq(tea, tea->freq);

		if ((tea->read_reg & TEA5777_R_SFOUND_MASK)) {
			tea->write_reg &= ~TEA5777_W_SEARCH_MASK;
			return 0;
		}

		if (tea->read_reg & TEA5777_R_BLIM_MASK) {
			res = -ENODATA;
			break;
		}

		/* Force read_reg update */
		tea->read_reg = -1;
	}
leave:
	tea->write_reg &= ~TEA5777_W_PROGBLIM_MASK;
	tea->write_reg &= ~TEA5777_W_SEARCH_MASK;
	tea->freq = orig_freq;
	radio_tea5777_set_freq(tea);
	return res;
}

static int tea575x_s_ctrl(struct v4l2_ctrl *c)
{
	struct radio_tea5777 *tea =
		container_of(c->handler, struct radio_tea5777, ctrl_handler);

	switch (c->id) {
	case V4L2_CID_AUDIO_MUTE:
		if (c->val)
			tea->write_reg |= TEA5777_W_MUTE_MASK;
		else
			tea->write_reg &= ~TEA5777_W_MUTE_MASK;

		return radio_tea5777_set_freq(tea);
	}

	return -EINVAL;
}

static const struct v4l2_file_operations tea575x_fops = {
	.unlocked_ioctl	= video_ioctl2,
	.open		= v4l2_fh_open,
	.release	= v4l2_fh_release,
	.poll		= v4l2_ctrl_poll,
};

static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
	.vidioc_querycap    = vidioc_querycap,
	.vidioc_g_tuner     = vidioc_g_tuner,
	.vidioc_s_tuner     = vidioc_s_tuner,
	.vidioc_g_frequency = vidioc_g_frequency,
	.vidioc_s_frequency = vidioc_s_frequency,
	.vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
	.vidioc_log_status  = v4l2_ctrl_log_status,
	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};

static const struct video_device tea575x_radio = {
	.ioctl_ops	= &tea575x_ioctl_ops,
	.release	= video_device_release_empty,
};

static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
	.s_ctrl = tea575x_s_ctrl,
};

int radio_tea5777_init(struct radio_tea5777 *tea, struct module *owner)
{
	int res;

	tea->write_reg = (1LL << TEA5777_W_IFCE_SHIFT) |
			 (1LL << TEA5777_W_IFW_SHIFT) |
			 (1LL << TEA5777_W_INTEXT_SHIFT) |
			 (1LL << TEA5777_W_CHP0_SHIFT) |
			 (2LL << TEA5777_W_SLEV_SHIFT);
	tea->freq = 90500 * 16;	/* 90.5Mhz default */
	res = radio_tea5777_set_freq(tea);
	if (res) {
		v4l2_err(tea->v4l2_dev, "can't set initial freq (%d)\n", res);
		return res;
	}

	tea->vd = tea575x_radio;
	video_set_drvdata(&tea->vd, tea);
	mutex_init(&tea->mutex);
	strlcpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
	tea->vd.lock = &tea->mutex;
	tea->vd.v4l2_dev = tea->v4l2_dev;
	tea->fops = tea575x_fops;
	tea->fops.owner = owner;
	tea->vd.fops = &tea->fops;
	set_bit(V4L2_FL_USE_FH_PRIO, &tea->vd.flags);

	tea->vd.ctrl_handler = &tea->ctrl_handler;
	v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
	v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops,
			  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
	res = tea->ctrl_handler.error;
	if (res) {
		v4l2_err(tea->v4l2_dev, "can't initialize controls\n");
		v4l2_ctrl_handler_free(&tea->ctrl_handler);
		return res;
	}
	v4l2_ctrl_handler_setup(&tea->ctrl_handler);

	res = video_register_device(&tea->vd, VFL_TYPE_RADIO, -1);
	if (res) {
		v4l2_err(tea->v4l2_dev, "can't register video device!\n");
		v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
		return res;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(radio_tea5777_init);

void radio_tea5777_exit(struct radio_tea5777 *tea)
{
	video_unregister_device(&tea->vd);
	v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
}
EXPORT_SYMBOL_GPL(radio_tea5777_exit);