aboutsummaryrefslogtreecommitdiff
path: root/sound/soc/codecs/tlv320aic26.c
blob: a038daec682bfba9dd6997b9acfbb4e0c4855ca2 (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
/*
 * Texas Instruments TLV320AIC26 low power audio CODEC
 * ALSA SoC CODEC driver
 *
 * Copyright (C) 2008 Secret Lab Technologies Ltd.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/device.h>
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>

#include "tlv320aic26.h"

MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver");
MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_LICENSE("GPL");

/* AIC26 driver private data */
struct aic26 {
	struct spi_device *spi;
	struct snd_soc_codec codec;
	int master;
	int datfm;
	int mclk;

	/* Keyclick parameters */
	int keyclick_amplitude;
	int keyclick_freq;
	int keyclick_len;
};

/* ---------------------------------------------------------------------
 * Register access routines
 */
static unsigned int aic26_reg_read(struct snd_soc_codec *codec,
				   unsigned int reg)
{
	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
	u16 *cache = codec->reg_cache;
	u16 cmd, value;
	u8 buffer[2];
	int rc;

	if (reg >= AIC26_NUM_REGS) {
		WARN_ON_ONCE(1);
		return 0;
	}

	/* Do SPI transfer; first 16bits are command; remaining is
	 * register contents */
	cmd = AIC26_READ_COMMAND_WORD(reg);
	buffer[0] = (cmd >> 8) & 0xff;
	buffer[1] = cmd & 0xff;
	rc = spi_write_then_read(aic26->spi, buffer, 2, buffer, 2);
	if (rc) {
		dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
		return -EIO;
	}
	value = (buffer[0] << 8) | buffer[1];

	/* Update the cache before returning with the value */
	cache[reg] = value;
	return value;
}

static unsigned int aic26_reg_read_cache(struct snd_soc_codec *codec,
					 unsigned int reg)
{
	u16 *cache = codec->reg_cache;

	if (reg >= AIC26_NUM_REGS) {
		WARN_ON_ONCE(1);
		return 0;
	}

	return cache[reg];
}

static int aic26_reg_write(struct snd_soc_codec *codec, unsigned int reg,
			   unsigned int value)
{
	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
	u16 *cache = codec->reg_cache;
	u16 cmd;
	u8 buffer[4];
	int rc;

	if (reg >= AIC26_NUM_REGS) {
		WARN_ON_ONCE(1);
		return -EINVAL;
	}

	/* Do SPI transfer; first 16bits are command; remaining is data
	 * to write into register */
	cmd = AIC26_WRITE_COMMAND_WORD(reg);
	buffer[0] = (cmd >> 8) & 0xff;
	buffer[1] = cmd & 0xff;
	buffer[2] = value >> 8;
	buffer[3] = value;
	rc = spi_write(aic26->spi, buffer, 4);
	if (rc) {
		dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
		return -EIO;
	}

	/* update cache before returning */
	cache[reg] = value;
	return 0;
}

/* ---------------------------------------------------------------------
 * Digital Audio Interface Operations
 */
static int aic26_hw_params(struct snd_pcm_substream *substream,
			   struct snd_pcm_hw_params *params,
			   struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
	int fsref, divisor, wlen, pval, jval, dval, qval;
	u16 reg;

	dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
		substream, params);
	dev_dbg(&aic26->spi->dev, "rate=%i format=%i\n", params_rate(params),
		params_format(params));

	switch (params_rate(params)) {
	case 8000:  fsref = 48000; divisor = AIC26_DIV_6; break;
	case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
	case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
	case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
	case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
	case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
	case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
	case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
	case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
	default:
		dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
	}

	/* select data word length */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:     wlen = AIC26_WLEN_16; break;
	case SNDRV_PCM_FORMAT_S16_BE: wlen = AIC26_WLEN_16; break;
	case SNDRV_PCM_FORMAT_S24_BE: wlen = AIC26_WLEN_24; break;
	case SNDRV_PCM_FORMAT_S32_BE: wlen = AIC26_WLEN_32; break;
	default:
		dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
	}

	/**
	 * Configure PLL
	 * fsref = (mclk * PLLM) / 2048
	 * where PLLM = J.DDDD (DDDD register ranges from 0 to 9999, decimal)
	 */
	pval = 1;
	/* compute J portion of multiplier */
	jval = fsref / (aic26->mclk / 2048);
	/* compute fractional DDDD component of multiplier */
	dval = fsref - (jval * (aic26->mclk / 2048));
	dval = (10000 * dval) / (aic26->mclk / 2048);
	dev_dbg(&aic26->spi->dev, "Setting PLLM to %d.%04d\n", jval, dval);
	qval = 0;
	reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
	aic26_reg_write(codec, AIC26_REG_PLL_PROG1, reg);
	reg = dval << 2;
	aic26_reg_write(codec, AIC26_REG_PLL_PROG2, reg);

	/* Audio Control 3 (master mode, fsref rate) */
	reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL3);
	reg &= ~0xf800;
	if (aic26->master)
		reg |= 0x0800;
	if (fsref == 48000)
		reg |= 0x2000;
	aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);

	/* Audio Control 1 (FSref divisor) */
	reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL1);
	reg &= ~0x0fff;
	reg |= wlen | aic26->datfm | (divisor << 3) | divisor;
	aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL1, reg);

	return 0;
}

/**
 * aic26_mute - Mute control to reduce noise when changing audio format
 */
static int aic26_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
	u16 reg = aic26_reg_read_cache(codec, AIC26_REG_DAC_GAIN);

	dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
		dai, mute);

	if (mute)
		reg |= 0x8080;
	else
		reg &= ~0x8080;
	aic26_reg_write(codec, AIC26_REG_DAC_GAIN, reg);

	return 0;
}

static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
			    int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);

	dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
		" freq=%i, dir=%i)\n",
		codec_dai, clk_id, freq, dir);

	/* MCLK needs to fall between 2MHz and 50 MHz */
	if ((freq < 2000000) || (freq > 50000000))
		return -EINVAL;

	aic26->mclk = freq;
	return 0;
}

static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);

	dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
		codec_dai, fmt);

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
	case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
	default:
		dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
	}

	/* interface format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:     aic26->datfm = AIC26_DATFM_I2S; break;
	case SND_SOC_DAIFMT_DSP_A:   aic26->datfm = AIC26_DATFM_DSP; break;
	case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
	case SND_SOC_DAIFMT_LEFT_J:  aic26->datfm = AIC26_DATFM_LEFTJ; break;
	default:
		dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
	}

	return 0;
}

/* ---------------------------------------------------------------------
 * Digital Audio Interface Definition
 */
#define AIC26_RATES	(SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
			 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
			 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
			 SNDRV_PCM_RATE_48000)
#define AIC26_FORMATS	(SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_BE |\
			 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)

static const struct snd_soc_dai_ops aic26_dai_ops = {
	.hw_params	= aic26_hw_params,
	.digital_mute	= aic26_mute,
	.set_sysclk	= aic26_set_sysclk,
	.set_fmt	= aic26_set_fmt,
};

static struct snd_soc_dai_driver aic26_dai = {
	.name = "tlv320aic26-hifi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = AIC26_RATES,
		.formats = AIC26_FORMATS,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 2,
		.channels_max = 2,
		.rates = AIC26_RATES,
		.formats = AIC26_FORMATS,
	},
	.ops = &aic26_dai_ops,
};

/* ---------------------------------------------------------------------
 * ALSA controls
 */
static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
static const struct soc_enum aic26_capture_src_enum =
	SOC_ENUM_SINGLE(AIC26_REG_AUDIO_CTRL1, 12, 2, aic26_capture_src_text);

static const struct snd_kcontrol_new aic26_snd_controls[] = {
	/* Output */
	SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
	SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
	SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
	SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
	SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
	SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
	SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
	SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
	SOC_ENUM("Capture Source", aic26_capture_src_enum),
};

/* ---------------------------------------------------------------------
 * SPI device portion of driver: sysfs files for debugging
 */

static ssize_t aic26_keyclick_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct aic26 *aic26 = dev_get_drvdata(dev);
	int val, amp, freq, len;

	val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
	amp = (val >> 12) & 0x7;
	freq = (125 << ((val >> 8) & 0x7)) >> 1;
	len = 2 * (1 + ((val >> 4) & 0xf));

	return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
}

/* Any write to the keyclick attribute will trigger the keyclick event */
static ssize_t aic26_keyclick_set(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t count)
{
	struct aic26 *aic26 = dev_get_drvdata(dev);
	int val;

	val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
	val |= 0x8000;
	aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL2, val);

	return count;
}

static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);

/* ---------------------------------------------------------------------
 * SoC CODEC portion of driver: probe and release routines
 */
static int aic26_probe(struct snd_soc_codec *codec)
{
	int ret, err, i, reg;

	dev_info(codec->dev, "Probing AIC26 SoC CODEC driver\n");

	/* Reset the codec to power on defaults */
	aic26_reg_write(codec, AIC26_REG_RESET, 0xBB00);

	/* Power up CODEC */
	aic26_reg_write(codec, AIC26_REG_POWER_CTRL, 0);

	/* Audio Control 3 (master mode, fsref rate) */
	reg = aic26_reg_read(codec, AIC26_REG_AUDIO_CTRL3);
	reg &= ~0xf800;
	reg |= 0x0800; /* set master mode */
	aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);

	/* Fill register cache */
	for (i = 0; i < codec->driver->reg_cache_size; i++)
		aic26_reg_read(codec, i);

	/* Register the sysfs files for debugging */
	/* Create SysFS files */
	ret = device_create_file(codec->dev, &dev_attr_keyclick);
	if (ret)
		dev_info(codec->dev, "error creating sysfs files\n");

	/* register controls */
	dev_dbg(codec->dev, "Registering controls\n");
	err = snd_soc_add_controls(codec, aic26_snd_controls,
			ARRAY_SIZE(aic26_snd_controls));
	WARN_ON(err < 0);

	return 0;
}

static struct snd_soc_codec_driver aic26_soc_codec_dev = {
	.probe = aic26_probe,
	.read = aic26_reg_read,
	.write = aic26_reg_write,
	.reg_cache_size = AIC26_NUM_REGS,
	.reg_word_size = sizeof(u16),
};

/* ---------------------------------------------------------------------
 * SPI device portion of driver: probe and release routines and SPI
 * 				 driver registration.
 */
static int aic26_spi_probe(struct spi_device *spi)
{
	struct aic26 *aic26;
	int ret;

	dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");

	/* Allocate driver data */
	aic26 = devm_kzalloc(&spi->dev, sizeof *aic26, GFP_KERNEL);
	if (!aic26)
		return -ENOMEM;

	/* Initialize the driver data */
	aic26->spi = spi;
	dev_set_drvdata(&spi->dev, aic26);
	aic26->master = 1;

	ret = snd_soc_register_codec(&spi->dev,
			&aic26_soc_codec_dev, &aic26_dai, 1);
	return ret;
}

static int aic26_spi_remove(struct spi_device *spi)
{
	snd_soc_unregister_codec(&spi->dev);
	return 0;
}

static struct spi_driver aic26_spi = {
	.driver = {
		.name = "tlv320aic26-codec",
		.owner = THIS_MODULE,
	},
	.probe = aic26_spi_probe,
	.remove = aic26_spi_remove,
};

static int __init aic26_init(void)
{
	return spi_register_driver(&aic26_spi);
}
module_init(aic26_init);

static void __exit aic26_exit(void)
{
	spi_unregister_driver(&aic26_spi);
}
module_exit(aic26_exit);