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Linux/sound/soc/codecs/max9850.c

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  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 unsigned int max9850_tlv[] = {
 71         TLV_DB_RANGE_HEAD(4),
 72         0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
 73         0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
 74         0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
 75         0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0),
 76 };
 77 
 78 static const struct snd_kcontrol_new max9850_controls[] = {
 79 SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
 80 SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
 81 SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
 82 };
 83 
 84 static const struct snd_kcontrol_new max9850_mixer_controls[] = {
 85         SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
 86 };
 87 
 88 static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
 89 SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
 90 SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
 91 SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
 92 SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
 93 SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
 94                 &max9850_mixer_controls[0],
 95                 ARRAY_SIZE(max9850_mixer_controls)),
 96 SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
 97 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
 98 SND_SOC_DAPM_OUTPUT("OUTL"),
 99 SND_SOC_DAPM_OUTPUT("HPL"),
100 SND_SOC_DAPM_OUTPUT("OUTR"),
101 SND_SOC_DAPM_OUTPUT("HPR"),
102 SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
103 SND_SOC_DAPM_INPUT("INL"),
104 SND_SOC_DAPM_INPUT("INR"),
105 };
106 
107 static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
108         /* output mixer */
109         {"Output Mixer", NULL, "DAC"},
110         {"Output Mixer", "Line In Switch", "Line Input"},
111 
112         /* outputs */
113         {"Headphone Output", NULL, "Output Mixer"},
114         {"HPL", NULL, "Headphone Output"},
115         {"HPR", NULL, "Headphone Output"},
116         {"OUTL", NULL, "Output Mixer"},
117         {"OUTR", NULL, "Output Mixer"},
118 
119         /* inputs */
120         {"Line Input", NULL, "INL"},
121         {"Line Input", NULL, "INR"},
122 
123         /* supplies */
124         {"Output Mixer", NULL, "Charge Pump 1"},
125         {"Output Mixer", NULL, "Charge Pump 2"},
126         {"Output Mixer", NULL, "SHDN"},
127         {"DAC", NULL, "MCLK"},
128 };
129 
130 static int max9850_hw_params(struct snd_pcm_substream *substream,
131                              struct snd_pcm_hw_params *params,
132                              struct snd_soc_dai *dai)
133 {
134         struct snd_soc_codec *codec = dai->codec;
135         struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
136         u64 lrclk_div;
137         u8 sf, da;
138 
139         if (!max9850->sysclk)
140                 return -EINVAL;
141 
142         /* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
143         sf = (snd_soc_read(codec, MAX9850_CLOCK) >> 2) + 1;
144         lrclk_div = (1 << 22);
145         lrclk_div *= params_rate(params);
146         lrclk_div *= sf;
147         do_div(lrclk_div, max9850->sysclk);
148 
149         snd_soc_write(codec, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
150         snd_soc_write(codec, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
151 
152         switch (params_width(params)) {
153         case 16:
154                 da = 0;
155                 break;
156         case 20:
157                 da = 0x2;
158                 break;
159         case 24:
160                 da = 0x3;
161                 break;
162         default:
163                 return -EINVAL;
164         }
165         snd_soc_update_bits(codec, MAX9850_DIGITAL_AUDIO, 0x3, da);
166 
167         return 0;
168 }
169 
170 static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
171                 int clk_id, unsigned int freq, int dir)
172 {
173         struct snd_soc_codec *codec = codec_dai->codec;
174         struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
175 
176         /* calculate mclk -> iclk divider */
177         if (freq <= 13000000)
178                 snd_soc_write(codec, MAX9850_CLOCK, 0x0);
179         else if (freq <= 26000000)
180                 snd_soc_write(codec, MAX9850_CLOCK, 0x4);
181         else if (freq <= 40000000)
182                 snd_soc_write(codec, MAX9850_CLOCK, 0x8);
183         else
184                 return -EINVAL;
185 
186         max9850->sysclk = freq;
187         return 0;
188 }
189 
190 static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
191 {
192         struct snd_soc_codec *codec = codec_dai->codec;
193         u8 da = 0;
194 
195         /* set master/slave audio interface */
196         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
197         case SND_SOC_DAIFMT_CBM_CFM:
198                 da |= MAX9850_MASTER;
199                 break;
200         case SND_SOC_DAIFMT_CBS_CFS:
201                 break;
202         default:
203                 return -EINVAL;
204         }
205 
206         /* interface format */
207         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
208         case SND_SOC_DAIFMT_I2S:
209                 da |= MAX9850_DLY;
210                 break;
211         case SND_SOC_DAIFMT_RIGHT_J:
212                 da |= MAX9850_RTJ;
213                 break;
214         case SND_SOC_DAIFMT_LEFT_J:
215                 break;
216         default:
217                 return -EINVAL;
218         }
219 
220         /* clock inversion */
221         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
222         case SND_SOC_DAIFMT_NB_NF:
223                 break;
224         case SND_SOC_DAIFMT_IB_IF:
225                 da |= MAX9850_BCINV | MAX9850_INV;
226                 break;
227         case SND_SOC_DAIFMT_IB_NF:
228                 da |= MAX9850_BCINV;
229                 break;
230         case SND_SOC_DAIFMT_NB_IF:
231                 da |= MAX9850_INV;
232                 break;
233         default:
234                 return -EINVAL;
235         }
236 
237         /* set da */
238         snd_soc_write(codec, MAX9850_DIGITAL_AUDIO, da);
239 
240         return 0;
241 }
242 
243 static int max9850_set_bias_level(struct snd_soc_codec *codec,
244                                   enum snd_soc_bias_level level)
245 {
246         struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
247         int ret;
248 
249         switch (level) {
250         case SND_SOC_BIAS_ON:
251                 break;
252         case SND_SOC_BIAS_PREPARE:
253                 break;
254         case SND_SOC_BIAS_STANDBY:
255                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
256                         ret = regcache_sync(max9850->regmap);
257                         if (ret) {
258                                 dev_err(codec->dev,
259                                         "Failed to sync cache: %d\n", ret);
260                                 return ret;
261                         }
262                 }
263                 break;
264         case SND_SOC_BIAS_OFF:
265                 break;
266         }
267         codec->dapm.bias_level = level;
268         return 0;
269 }
270 
271 #define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
272 
273 #define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
274         SNDRV_PCM_FMTBIT_S24_LE)
275 
276 static const struct snd_soc_dai_ops max9850_dai_ops = {
277         .hw_params      = max9850_hw_params,
278         .set_sysclk     = max9850_set_dai_sysclk,
279         .set_fmt        = max9850_set_dai_fmt,
280 };
281 
282 static struct snd_soc_dai_driver max9850_dai = {
283         .name = "max9850-hifi",
284         .playback = {
285                 .stream_name = "Playback",
286                 .channels_min = 1,
287                 .channels_max = 2,
288                 .rates = MAX9850_RATES,
289                 .formats = MAX9850_FORMATS
290         },
291         .ops = &max9850_dai_ops,
292 };
293 
294 static int max9850_probe(struct snd_soc_codec *codec)
295 {
296         /* enable zero-detect */
297         snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
298         /* enable slew-rate control */
299         snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
300         /* set slew-rate 125ms */
301         snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
302 
303         return 0;
304 }
305 
306 static struct snd_soc_codec_driver soc_codec_dev_max9850 = {
307         .probe =        max9850_probe,
308         .set_bias_level = max9850_set_bias_level,
309         .suspend_bias_off = true,
310 
311         .controls = max9850_controls,
312         .num_controls = ARRAY_SIZE(max9850_controls),
313         .dapm_widgets = max9850_dapm_widgets,
314         .num_dapm_widgets = ARRAY_SIZE(max9850_dapm_widgets),
315         .dapm_routes = max9850_dapm_routes,
316         .num_dapm_routes = ARRAY_SIZE(max9850_dapm_routes),
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                 .owner = THIS_MODULE,
357         },
358         .probe = max9850_i2c_probe,
359         .remove = max9850_i2c_remove,
360         .id_table = max9850_i2c_id,
361 };
362 
363 module_i2c_driver(max9850_i2c_driver);
364 
365 MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
366 MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
367 MODULE_LICENSE("GPL");
368 

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