summaryrefslogtreecommitdiff
path: root/sound/soc/codecs/max9850.c
blob: 94c2b586ed5dbf12a645384c7d8e55470416acae (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
/*
 * max9850.c  --  codec driver for max9850
 *
 * Copyright (C) 2011 taskit GmbH
 *
 * Author: Christian Glindkamp <christian.glindkamp@taskit.de>
 *
 * Initial development of this code was funded by
 * MICRONIC Computer Systeme GmbH, http://www.mcsberlin.de/
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>

#include "max9850.h"

struct max9850_priv {
	unsigned int sysclk;
};

/* max9850 register cache */
static const u8 max9850_reg[MAX9850_CACHEREGNUM] = {
	0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

/* these registers are not used at the moment but provided for the sake of
 * completeness */
static int max9850_volatile_register(struct snd_soc_codec *codec,
		unsigned int reg)
{
	switch (reg) {
	case MAX9850_STATUSA:
	case MAX9850_STATUSB:
		return 1;
	default:
		return 0;
	}
}

static const unsigned int max9850_tlv[] = {
	TLV_DB_RANGE_HEAD(4),
	0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
	0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
	0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
	0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0),
};

static const struct snd_kcontrol_new max9850_controls[] = {
SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
};

static const struct snd_kcontrol_new max9850_mixer_controls[] = {
	SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
};

static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
		&max9850_mixer_controls[0],
		ARRAY_SIZE(max9850_mixer_controls)),
SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
SND_SOC_DAPM_OUTPUT("OUTL"),
SND_SOC_DAPM_OUTPUT("HPL"),
SND_SOC_DAPM_OUTPUT("OUTR"),
SND_SOC_DAPM_OUTPUT("HPR"),
SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
SND_SOC_DAPM_INPUT("INL"),
SND_SOC_DAPM_INPUT("INR"),
};

static const struct snd_soc_dapm_route intercon[] = {
	/* output mixer */
	{"Output Mixer", NULL, "DAC"},
	{"Output Mixer", "Line In Switch", "Line Input"},

	/* outputs */
	{"Headphone Output", NULL, "Output Mixer"},
	{"HPL", NULL, "Headphone Output"},
	{"HPR", NULL, "Headphone Output"},
	{"OUTL", NULL, "Output Mixer"},
	{"OUTR", NULL, "Output Mixer"},

	/* inputs */
	{"Line Input", NULL, "INL"},
	{"Line Input", NULL, "INR"},

	/* supplies */
	{"Output Mixer", NULL, "Charge Pump 1"},
	{"Output Mixer", NULL, "Charge Pump 2"},
	{"Output Mixer", NULL, "SHDN"},
	{"DAC", NULL, "MCLK"},
};

static int max9850_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params,
			     struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
	u64 lrclk_div;
	u8 sf, da;

	if (!max9850->sysclk)
		return -EINVAL;

	/* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
	sf = (snd_soc_read(codec, MAX9850_CLOCK) >> 2) + 1;
	lrclk_div = (1 << 22);
	lrclk_div *= params_rate(params);
	lrclk_div *= sf;
	do_div(lrclk_div, max9850->sysclk);

	snd_soc_write(codec, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
	snd_soc_write(codec, MAX9850_LRCLK_LSB, lrclk_div & 0xff);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		da = 0;
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		da = 0x2;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		da = 0x3;
		break;
	default:
		return -EINVAL;
	}
	snd_soc_update_bits(codec, MAX9850_DIGITAL_AUDIO, 0x3, da);

	return 0;
}

static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
		int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);

	/* calculate mclk -> iclk divider */
	if (freq <= 13000000)
		snd_soc_write(codec, MAX9850_CLOCK, 0x0);
	else if (freq <= 26000000)
		snd_soc_write(codec, MAX9850_CLOCK, 0x4);
	else if (freq <= 40000000)
		snd_soc_write(codec, MAX9850_CLOCK, 0x8);
	else
		return -EINVAL;

	max9850->sysclk = freq;
	return 0;
}

static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u8 da = 0;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		da |= MAX9850_MASTER;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		return -EINVAL;
	}

	/* interface format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		da |= MAX9850_DLY;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		da |= MAX9850_RTJ;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		break;
	default:
		return -EINVAL;
	}

	/* clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	case SND_SOC_DAIFMT_IB_IF:
		da |= MAX9850_BCINV | MAX9850_INV;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		da |= MAX9850_BCINV;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		da |= MAX9850_INV;
		break;
	default:
		return -EINVAL;
	}

	/* set da */
	snd_soc_write(codec, MAX9850_DIGITAL_AUDIO, da);

	return 0;
}

static int max9850_set_bias_level(struct snd_soc_codec *codec,
				  enum snd_soc_bias_level level)
{
	int ret;

	switch (level) {
	case SND_SOC_BIAS_ON:
		break;
	case SND_SOC_BIAS_PREPARE:
		break;
	case SND_SOC_BIAS_STANDBY:
		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
			ret = snd_soc_cache_sync(codec);
			if (ret) {
				dev_err(codec->dev,
					"Failed to sync cache: %d\n", ret);
				return ret;
			}
		}
		break;
	case SND_SOC_BIAS_OFF:
		break;
	}
	codec->dapm.bias_level = level;
	return 0;
}

#define MAX9850_RATES SNDRV_PCM_RATE_8000_48000

#define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
	SNDRV_PCM_FMTBIT_S24_LE)

static const struct snd_soc_dai_ops max9850_dai_ops = {
	.hw_params	= max9850_hw_params,
	.set_sysclk	= max9850_set_dai_sysclk,
	.set_fmt	= max9850_set_dai_fmt,
};

static struct snd_soc_dai_driver max9850_dai = {
	.name = "max9850-hifi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = MAX9850_RATES,
		.formats = MAX9850_FORMATS
	},
	.ops = &max9850_dai_ops,
};

#ifdef CONFIG_PM
static int max9850_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
	max9850_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;
}

static int max9850_resume(struct snd_soc_codec *codec)
{
	max9850_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
}
#else
#define max9850_suspend NULL
#define max9850_resume NULL
#endif

static int max9850_probe(struct snd_soc_codec *codec)
{
	struct snd_soc_dapm_context *dapm = &codec->dapm;
	int ret;

	ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_I2C);
	if (ret < 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		return ret;
	}

	/* enable zero-detect */
	snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
	/* enable slew-rate control */
	snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
	/* set slew-rate 125ms */
	snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);

	snd_soc_dapm_new_controls(dapm, max9850_dapm_widgets,
				  ARRAY_SIZE(max9850_dapm_widgets));
	snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));

	snd_soc_add_controls(codec, max9850_controls,
			ARRAY_SIZE(max9850_controls));

	return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_max9850 = {
	.probe =	max9850_probe,
	.suspend =	max9850_suspend,
	.resume =	max9850_resume,
	.set_bias_level = max9850_set_bias_level,
	.reg_cache_size = ARRAY_SIZE(max9850_reg),
	.reg_word_size = sizeof(u8),
	.reg_cache_default = max9850_reg,
	.volatile_register = max9850_volatile_register,
};

static int __devinit max9850_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
{
	struct max9850_priv *max9850;
	int ret;

	max9850 = kzalloc(sizeof(struct max9850_priv), GFP_KERNEL);
	if (max9850 == NULL)
		return -ENOMEM;

	i2c_set_clientdata(i2c, max9850);

	ret = snd_soc_register_codec(&i2c->dev,
			&soc_codec_dev_max9850, &max9850_dai, 1);
	if (ret < 0)
		kfree(max9850);
	return ret;
}

static __devexit int max9850_i2c_remove(struct i2c_client *client)
{
	snd_soc_unregister_codec(&client->dev);
	kfree(i2c_get_clientdata(client));
	return 0;
}

static const struct i2c_device_id max9850_i2c_id[] = {
	{ "max9850", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);

static struct i2c_driver max9850_i2c_driver = {
	.driver = {
		.name = "max9850",
		.owner = THIS_MODULE,
	},
	.probe = max9850_i2c_probe,
	.remove = __devexit_p(max9850_i2c_remove),
	.id_table = max9850_i2c_id,
};

static int __init max9850_init(void)
{
	return i2c_add_driver(&max9850_i2c_driver);
}
module_init(max9850_init);

static void __exit max9850_exit(void)
{
	i2c_del_driver(&max9850_i2c_driver);
}
module_exit(max9850_exit);

MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
MODULE_LICENSE("GPL");