xref: /openbmc/linux/sound/soc/codecs/max9850.c (revision 68198dca)
1 /*
2  * max9850.c  --  codec driver for max9850
3  *
4  * Copyright (C) 2011 taskit GmbH
5  *
6  * Author: Christian Glindkamp <christian.glindkamp@taskit.de>
7  *
8  * Initial development of this code was funded by
9  * MICRONIC Computer Systeme GmbH, http://www.mcsberlin.de/
10  *
11  * This program is free software; you can redistribute  it and/or modify it
12  * under  the terms of  the GNU General  Public License as published by the
13  * Free Software Foundation;  either version 2 of the  License, or (at your
14  * option) any later version.
15  *
16  */
17 
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/i2c.h>
21 #include <linux/regmap.h>
22 #include <linux/slab.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/tlv.h>
27 
28 #include "max9850.h"
29 
30 struct max9850_priv {
31 	struct regmap *regmap;
32 	unsigned int sysclk;
33 };
34 
35 /* max9850 register cache */
36 static const struct reg_default max9850_reg[] = {
37 	{  2, 0x0c },
38 	{  3, 0x00 },
39 	{  4, 0x00 },
40 	{  5, 0x00 },
41 	{  6, 0x00 },
42 	{  7, 0x00 },
43 	{  8, 0x00 },
44 	{  9, 0x00 },
45 	{ 10, 0x00 },
46 };
47 
48 /* these registers are not used at the moment but provided for the sake of
49  * completeness */
50 static bool max9850_volatile_register(struct device *dev, unsigned int reg)
51 {
52 	switch (reg) {
53 	case MAX9850_STATUSA:
54 	case MAX9850_STATUSB:
55 		return 1;
56 	default:
57 		return 0;
58 	}
59 }
60 
61 static const struct regmap_config max9850_regmap = {
62 	.reg_bits = 8,
63 	.val_bits = 8,
64 
65 	.max_register = MAX9850_DIGITAL_AUDIO,
66 	.volatile_reg = max9850_volatile_register,
67 	.cache_type = REGCACHE_RBTREE,
68 };
69 
70 static const DECLARE_TLV_DB_RANGE(max9850_tlv,
71 	0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
72 	0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
73 	0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
74 	0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0)
75 );
76 
77 static const struct snd_kcontrol_new max9850_controls[] = {
78 SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
79 SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
80 SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
81 };
82 
83 static const struct snd_kcontrol_new max9850_mixer_controls[] = {
84 	SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
85 };
86 
87 static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
88 SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
89 SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
90 SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
91 SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
92 SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
93 		&max9850_mixer_controls[0],
94 		ARRAY_SIZE(max9850_mixer_controls)),
95 SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
96 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
97 SND_SOC_DAPM_OUTPUT("OUTL"),
98 SND_SOC_DAPM_OUTPUT("HPL"),
99 SND_SOC_DAPM_OUTPUT("OUTR"),
100 SND_SOC_DAPM_OUTPUT("HPR"),
101 SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
102 SND_SOC_DAPM_INPUT("INL"),
103 SND_SOC_DAPM_INPUT("INR"),
104 };
105 
106 static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
107 	/* output mixer */
108 	{"Output Mixer", NULL, "DAC"},
109 	{"Output Mixer", "Line In Switch", "Line Input"},
110 
111 	/* outputs */
112 	{"Headphone Output", NULL, "Output Mixer"},
113 	{"HPL", NULL, "Headphone Output"},
114 	{"HPR", NULL, "Headphone Output"},
115 	{"OUTL", NULL, "Output Mixer"},
116 	{"OUTR", NULL, "Output Mixer"},
117 
118 	/* inputs */
119 	{"Line Input", NULL, "INL"},
120 	{"Line Input", NULL, "INR"},
121 
122 	/* supplies */
123 	{"Output Mixer", NULL, "Charge Pump 1"},
124 	{"Output Mixer", NULL, "Charge Pump 2"},
125 	{"Output Mixer", NULL, "SHDN"},
126 	{"DAC", NULL, "MCLK"},
127 };
128 
129 static int max9850_hw_params(struct snd_pcm_substream *substream,
130 			     struct snd_pcm_hw_params *params,
131 			     struct snd_soc_dai *dai)
132 {
133 	struct snd_soc_codec *codec = dai->codec;
134 	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
135 	u64 lrclk_div;
136 	u8 sf, da;
137 
138 	if (!max9850->sysclk)
139 		return -EINVAL;
140 
141 	/* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
142 	sf = (snd_soc_read(codec, MAX9850_CLOCK) >> 2) + 1;
143 	lrclk_div = (1 << 22);
144 	lrclk_div *= params_rate(params);
145 	lrclk_div *= sf;
146 	do_div(lrclk_div, max9850->sysclk);
147 
148 	snd_soc_write(codec, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
149 	snd_soc_write(codec, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
150 
151 	switch (params_width(params)) {
152 	case 16:
153 		da = 0;
154 		break;
155 	case 20:
156 		da = 0x2;
157 		break;
158 	case 24:
159 		da = 0x3;
160 		break;
161 	default:
162 		return -EINVAL;
163 	}
164 	snd_soc_update_bits(codec, MAX9850_DIGITAL_AUDIO, 0x3, da);
165 
166 	return 0;
167 }
168 
169 static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
170 		int clk_id, unsigned int freq, int dir)
171 {
172 	struct snd_soc_codec *codec = codec_dai->codec;
173 	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
174 
175 	/* calculate mclk -> iclk divider */
176 	if (freq <= 13000000)
177 		snd_soc_write(codec, MAX9850_CLOCK, 0x0);
178 	else if (freq <= 26000000)
179 		snd_soc_write(codec, MAX9850_CLOCK, 0x4);
180 	else if (freq <= 40000000)
181 		snd_soc_write(codec, MAX9850_CLOCK, 0x8);
182 	else
183 		return -EINVAL;
184 
185 	max9850->sysclk = freq;
186 	return 0;
187 }
188 
189 static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
190 {
191 	struct snd_soc_codec *codec = codec_dai->codec;
192 	u8 da = 0;
193 
194 	/* set master/slave audio interface */
195 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
196 	case SND_SOC_DAIFMT_CBM_CFM:
197 		da |= MAX9850_MASTER;
198 		break;
199 	case SND_SOC_DAIFMT_CBS_CFS:
200 		break;
201 	default:
202 		return -EINVAL;
203 	}
204 
205 	/* interface format */
206 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
207 	case SND_SOC_DAIFMT_I2S:
208 		da |= MAX9850_DLY;
209 		break;
210 	case SND_SOC_DAIFMT_RIGHT_J:
211 		da |= MAX9850_RTJ;
212 		break;
213 	case SND_SOC_DAIFMT_LEFT_J:
214 		break;
215 	default:
216 		return -EINVAL;
217 	}
218 
219 	/* clock inversion */
220 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
221 	case SND_SOC_DAIFMT_NB_NF:
222 		break;
223 	case SND_SOC_DAIFMT_IB_IF:
224 		da |= MAX9850_BCINV | MAX9850_INV;
225 		break;
226 	case SND_SOC_DAIFMT_IB_NF:
227 		da |= MAX9850_BCINV;
228 		break;
229 	case SND_SOC_DAIFMT_NB_IF:
230 		da |= MAX9850_INV;
231 		break;
232 	default:
233 		return -EINVAL;
234 	}
235 
236 	/* set da */
237 	snd_soc_write(codec, MAX9850_DIGITAL_AUDIO, da);
238 
239 	return 0;
240 }
241 
242 static int max9850_set_bias_level(struct snd_soc_codec *codec,
243 				  enum snd_soc_bias_level level)
244 {
245 	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
246 	int ret;
247 
248 	switch (level) {
249 	case SND_SOC_BIAS_ON:
250 		break;
251 	case SND_SOC_BIAS_PREPARE:
252 		break;
253 	case SND_SOC_BIAS_STANDBY:
254 		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
255 			ret = regcache_sync(max9850->regmap);
256 			if (ret) {
257 				dev_err(codec->dev,
258 					"Failed to sync cache: %d\n", ret);
259 				return ret;
260 			}
261 		}
262 		break;
263 	case SND_SOC_BIAS_OFF:
264 		break;
265 	}
266 	return 0;
267 }
268 
269 #define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
270 
271 #define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
272 	SNDRV_PCM_FMTBIT_S24_LE)
273 
274 static const struct snd_soc_dai_ops max9850_dai_ops = {
275 	.hw_params	= max9850_hw_params,
276 	.set_sysclk	= max9850_set_dai_sysclk,
277 	.set_fmt	= max9850_set_dai_fmt,
278 };
279 
280 static struct snd_soc_dai_driver max9850_dai = {
281 	.name = "max9850-hifi",
282 	.playback = {
283 		.stream_name = "Playback",
284 		.channels_min = 1,
285 		.channels_max = 2,
286 		.rates = MAX9850_RATES,
287 		.formats = MAX9850_FORMATS
288 	},
289 	.ops = &max9850_dai_ops,
290 };
291 
292 static int max9850_probe(struct snd_soc_codec *codec)
293 {
294 	/* enable zero-detect */
295 	snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
296 	/* enable slew-rate control */
297 	snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
298 	/* set slew-rate 125ms */
299 	snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
300 
301 	return 0;
302 }
303 
304 static const struct snd_soc_codec_driver soc_codec_dev_max9850 = {
305 	.probe =	max9850_probe,
306 	.set_bias_level = max9850_set_bias_level,
307 	.suspend_bias_off = true,
308 
309 	.component_driver = {
310 		.controls		= max9850_controls,
311 		.num_controls		= ARRAY_SIZE(max9850_controls),
312 		.dapm_widgets		= max9850_dapm_widgets,
313 		.num_dapm_widgets	= ARRAY_SIZE(max9850_dapm_widgets),
314 		.dapm_routes		= max9850_dapm_routes,
315 		.num_dapm_routes	= ARRAY_SIZE(max9850_dapm_routes),
316 	},
317 };
318 
319 static int max9850_i2c_probe(struct i2c_client *i2c,
320 			     const struct i2c_device_id *id)
321 {
322 	struct max9850_priv *max9850;
323 	int ret;
324 
325 	max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
326 			       GFP_KERNEL);
327 	if (max9850 == NULL)
328 		return -ENOMEM;
329 
330 	max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap);
331 	if (IS_ERR(max9850->regmap))
332 		return PTR_ERR(max9850->regmap);
333 
334 	i2c_set_clientdata(i2c, max9850);
335 
336 	ret = snd_soc_register_codec(&i2c->dev,
337 			&soc_codec_dev_max9850, &max9850_dai, 1);
338 	return ret;
339 }
340 
341 static int max9850_i2c_remove(struct i2c_client *client)
342 {
343 	snd_soc_unregister_codec(&client->dev);
344 	return 0;
345 }
346 
347 static const struct i2c_device_id max9850_i2c_id[] = {
348 	{ "max9850", 0 },
349 	{ }
350 };
351 MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
352 
353 static struct i2c_driver max9850_i2c_driver = {
354 	.driver = {
355 		.name = "max9850",
356 	},
357 	.probe = max9850_i2c_probe,
358 	.remove = max9850_i2c_remove,
359 	.id_table = max9850_i2c_id,
360 };
361 
362 module_i2c_driver(max9850_i2c_driver);
363 
364 MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
365 MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
366 MODULE_LICENSE("GPL");
367