sound/soc/codecs/max9850.c

   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 #ifdef CONFIG_PM
 295 static int max9850_suspend(struct snd_soc_codec *codec)
 296 {
 297         max9850_set_bias_level(codec, SND_SOC_BIAS_OFF);
 298
 299         return 0;
 300 }
 301
 302 static int max9850_resume(struct snd_soc_codec *codec)
 303 {
 304         max9850_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 305
 306         return 0;
 307 }
 308 #else
 309 #define max9850_suspend NULL
 310 #define max9850_resume NULL
 311 #endif
 312
 313 static int max9850_probe(struct snd_soc_codec *codec)
 314 {
 315         /* enable zero-detect */
 316         snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
 317         /* enable slew-rate control */
 318         snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
 319         /* set slew-rate 125ms */
 320         snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
 321
 322         return 0;
 323 }
 324
 325 static struct snd_soc_codec_driver soc_codec_dev_max9850 = {
 326         .probe =        max9850_probe,
 327         .suspend =      max9850_suspend,
 328         .resume =       max9850_resume,
 329         .set_bias_level = max9850_set_bias_level,
 330
 331         .controls = max9850_controls,
 332         .num_controls = ARRAY_SIZE(max9850_controls),
 333         .dapm_widgets = max9850_dapm_widgets,
 334         .num_dapm_widgets = ARRAY_SIZE(max9850_dapm_widgets),
 335         .dapm_routes = max9850_dapm_routes,
 336         .num_dapm_routes = ARRAY_SIZE(max9850_dapm_routes),
 337 };
 338
 339 static int max9850_i2c_probe(struct i2c_client *i2c,
 340                              const struct i2c_device_id *id)
 341 {
 342         struct max9850_priv *max9850;
 343         int ret;
 344
 345         max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
 346                                GFP_KERNEL);
 347         if (max9850 == NULL)
 348                 return -ENOMEM;
 349
 350         max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap);
 351         if (IS_ERR(max9850->regmap))
 352                 return PTR_ERR(max9850->regmap);
 353
 354         i2c_set_clientdata(i2c, max9850);
 355
 356         ret = snd_soc_register_codec(&i2c->dev,
 357                         &soc_codec_dev_max9850, &max9850_dai, 1);
 358         return ret;
 359 }
 360
 361 static int max9850_i2c_remove(struct i2c_client *client)
 362 {
 363         snd_soc_unregister_codec(&client->dev);
 364         return 0;
 365 }
 366
 367 static const struct i2c_device_id max9850_i2c_id[] = {
 368         { "max9850", 0 },
 369         { }
 370 };
 371 MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
 372
 373 static struct i2c_driver max9850_i2c_driver = {
 374         .driver = {
 375                 .name = "max9850",
 376                 .owner = THIS_MODULE,
 377         },
 378         .probe = max9850_i2c_probe,
 379         .remove = max9850_i2c_remove,
 380         .id_table = max9850_i2c_id,
 381 };
 382
 383 module_i2c_driver(max9850_i2c_driver);
 384
 385 MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
 386 MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
 387 MODULE_LICENSE("GPL");