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 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 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");