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/slab.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <sound/tlv.h>
  26
  27 #include "max9850.h"
  28
  29 struct max9850_priv {
  30         unsigned int sysclk;
  31 };
  32
  33 /* max9850 register cache */
  34 static const u8 max9850_reg[MAX9850_CACHEREGNUM] = {
  35         0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  36 };
  37
  38 /* these registers are not used at the moment but provided for the sake of
  39  * completeness */
  40 static int max9850_volatile_register(struct snd_soc_codec *codec,
  41                 unsigned int reg)
  42 {
  43         switch (reg) {
  44         case MAX9850_STATUSA:
  45         case MAX9850_STATUSB:
  46                 return 1;
  47         default:
  48                 return 0;
  49         }
  50 }
  51
  52 static const unsigned int max9850_tlv[] = {
  53         TLV_DB_RANGE_HEAD(4),
  54         0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
  55         0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
  56         0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
  57         0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0),
  58 };
  59
  60 static const struct snd_kcontrol_new max9850_controls[] = {
  61 SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
  62 SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
  63 SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
  64 };
  65
  66 static const struct snd_kcontrol_new max9850_mixer_controls[] = {
  67         SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
  68 };
  69
  70 static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
  71 SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
  72 SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
  73 SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
  74 SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
  75 SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
  76                 &max9850_mixer_controls[0],
  77                 ARRAY_SIZE(max9850_mixer_controls)),
  78 SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
  79 SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
  80 SND_SOC_DAPM_OUTPUT("OUTL"),
  81 SND_SOC_DAPM_OUTPUT("HPL"),
  82 SND_SOC_DAPM_OUTPUT("OUTR"),
  83 SND_SOC_DAPM_OUTPUT("HPR"),
  84 SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
  85 SND_SOC_DAPM_INPUT("INL"),
  86 SND_SOC_DAPM_INPUT("INR"),
  87 };
  88
  89 static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
  90         /* output mixer */
  91         {"Output Mixer", NULL, "DAC"},
  92         {"Output Mixer", "Line In Switch", "Line Input"},
  93
  94         /* outputs */
  95         {"Headphone Output", NULL, "Output Mixer"},
  96         {"HPL", NULL, "Headphone Output"},
  97         {"HPR", NULL, "Headphone Output"},
  98         {"OUTL", NULL, "Output Mixer"},
  99         {"OUTR", NULL, "Output Mixer"},
 100
 101         /* inputs */
 102         {"Line Input", NULL, "INL"},
 103         {"Line Input", NULL, "INR"},
 104
 105         /* supplies */
 106         {"Output Mixer", NULL, "Charge Pump 1"},
 107         {"Output Mixer", NULL, "Charge Pump 2"},
 108         {"Output Mixer", NULL, "SHDN"},
 109         {"DAC", NULL, "MCLK"},
 110 };
 111
 112 static int max9850_hw_params(struct snd_pcm_substream *substream,
 113                              struct snd_pcm_hw_params *params,
 114                              struct snd_soc_dai *dai)
 115 {
 116         struct snd_soc_codec *codec = dai->codec;
 117         struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
 118         u64 lrclk_div;
 119         u8 sf, da;
 120
 121         if (!max9850->sysclk)
 122                 return -EINVAL;
 123
 124         /* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
 125         sf = (snd_soc_read(codec, MAX9850_CLOCK) >> 2) + 1;
 126         lrclk_div = (1 << 22);
 127         lrclk_div *= params_rate(params);
 128         lrclk_div *= sf;
 129         do_div(lrclk_div, max9850->sysclk);
 130
 131         snd_soc_write(codec, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
 132         snd_soc_write(codec, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
 133
 134         switch (params_format(params)) {
 135         case SNDRV_PCM_FORMAT_S16_LE:
 136                 da = 0;
 137                 break;
 138         case SNDRV_PCM_FORMAT_S20_3LE:
 139                 da = 0x2;
 140                 break;
 141         case SNDRV_PCM_FORMAT_S24_LE:
 142                 da = 0x3;
 143                 break;
 144         default:
 145                 return -EINVAL;
 146         }
 147         snd_soc_update_bits(codec, MAX9850_DIGITAL_AUDIO, 0x3, da);
 148
 149         return 0;
 150 }
 151
 152 static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 153                 int clk_id, unsigned int freq, int dir)
 154 {
 155         struct snd_soc_codec *codec = codec_dai->codec;
 156         struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
 157
 158         /* calculate mclk -> iclk divider */
 159         if (freq <= 13000000)
 160                 snd_soc_write(codec, MAX9850_CLOCK, 0x0);
 161         else if (freq <= 26000000)
 162                 snd_soc_write(codec, MAX9850_CLOCK, 0x4);
 163         else if (freq <= 40000000)
 164                 snd_soc_write(codec, MAX9850_CLOCK, 0x8);
 165         else
 166                 return -EINVAL;
 167
 168         max9850->sysclk = freq;
 169         return 0;
 170 }
 171
 172 static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 173 {
 174         struct snd_soc_codec *codec = codec_dai->codec;
 175         u8 da = 0;
 176
 177         /* set master/slave audio interface */
 178         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 179         case SND_SOC_DAIFMT_CBM_CFM:
 180                 da |= MAX9850_MASTER;
 181                 break;
 182         case SND_SOC_DAIFMT_CBS_CFS:
 183                 break;
 184         default:
 185                 return -EINVAL;
 186         }
 187
 188         /* interface format */
 189         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 190         case SND_SOC_DAIFMT_I2S:
 191                 da |= MAX9850_DLY;
 192                 break;
 193         case SND_SOC_DAIFMT_RIGHT_J:
 194                 da |= MAX9850_RTJ;
 195                 break;
 196         case SND_SOC_DAIFMT_LEFT_J:
 197                 break;
 198         default:
 199                 return -EINVAL;
 200         }
 201
 202         /* clock inversion */
 203         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 204         case SND_SOC_DAIFMT_NB_NF:
 205                 break;
 206         case SND_SOC_DAIFMT_IB_IF:
 207                 da |= MAX9850_BCINV | MAX9850_INV;
 208                 break;
 209         case SND_SOC_DAIFMT_IB_NF:
 210                 da |= MAX9850_BCINV;
 211                 break;
 212         case SND_SOC_DAIFMT_NB_IF:
 213                 da |= MAX9850_INV;
 214                 break;
 215         default:
 216                 return -EINVAL;
 217         }
 218
 219         /* set da */
 220         snd_soc_write(codec, MAX9850_DIGITAL_AUDIO, da);
 221
 222         return 0;
 223 }
 224
 225 static int max9850_set_bias_level(struct snd_soc_codec *codec,
 226                                   enum snd_soc_bias_level level)
 227 {
 228         int ret;
 229
 230         switch (level) {
 231         case SND_SOC_BIAS_ON:
 232                 break;
 233         case SND_SOC_BIAS_PREPARE:
 234                 break;
 235         case SND_SOC_BIAS_STANDBY:
 236                 if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
 237                         ret = snd_soc_cache_sync(codec);
 238                         if (ret) {
 239                                 dev_err(codec->dev,
 240                                         "Failed to sync cache: %d\n", ret);
 241                                 return ret;
 242                         }
 243                 }
 244                 break;
 245         case SND_SOC_BIAS_OFF:
 246                 break;
 247         }
 248         codec->dapm.bias_level = level;
 249         return 0;
 250 }
 251
 252 #define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
 253
 254 #define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 255         SNDRV_PCM_FMTBIT_S24_LE)
 256
 257 static const struct snd_soc_dai_ops max9850_dai_ops = {
 258         .hw_params      = max9850_hw_params,
 259         .set_sysclk     = max9850_set_dai_sysclk,
 260         .set_fmt        = max9850_set_dai_fmt,
 261 };
 262
 263 static struct snd_soc_dai_driver max9850_dai = {
 264         .name = "max9850-hifi",
 265         .playback = {
 266                 .stream_name = "Playback",
 267                 .channels_min = 1,
 268                 .channels_max = 2,
 269                 .rates = MAX9850_RATES,
 270                 .formats = MAX9850_FORMATS
 271         },
 272         .ops = &max9850_dai_ops,
 273 };
 274
 275 #ifdef CONFIG_PM
 276 static int max9850_suspend(struct snd_soc_codec *codec)
 277 {
 278         max9850_set_bias_level(codec, SND_SOC_BIAS_OFF);
 279
 280         return 0;
 281 }
 282
 283 static int max9850_resume(struct snd_soc_codec *codec)
 284 {
 285         max9850_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
 286
 287         return 0;
 288 }
 289 #else
 290 #define max9850_suspend NULL
 291 #define max9850_resume NULL
 292 #endif
 293
 294 static int max9850_probe(struct snd_soc_codec *codec)
 295 {
 296         int ret;
 297
 298         ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_I2C);
 299         if (ret < 0) {
 300                 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 301                 return ret;
 302         }
 303
 304         /* enable zero-detect */
 305         snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
 306         /* enable slew-rate control */
 307         snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
 308         /* set slew-rate 125ms */
 309         snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
 310
 311         return 0;
 312 }
 313
 314 static struct snd_soc_codec_driver soc_codec_dev_max9850 = {
 315         .probe =        max9850_probe,
 316         .suspend =      max9850_suspend,
 317         .resume =       max9850_resume,
 318         .set_bias_level = max9850_set_bias_level,
 319         .reg_cache_size = ARRAY_SIZE(max9850_reg),
 320         .reg_word_size = sizeof(u8),
 321         .reg_cache_default = max9850_reg,
 322         .volatile_register = max9850_volatile_register,
 323
 324         .controls = max9850_controls,
 325         .num_controls = ARRAY_SIZE(max9850_controls),
 326         .dapm_widgets = max9850_dapm_widgets,
 327         .num_dapm_widgets = ARRAY_SIZE(max9850_dapm_widgets),
 328         .dapm_routes = max9850_dapm_routes,
 329         .num_dapm_routes = ARRAY_SIZE(max9850_dapm_routes),
 330 };
 331
 332 static int max9850_i2c_probe(struct i2c_client *i2c,
 333                              const struct i2c_device_id *id)
 334 {
 335         struct max9850_priv *max9850;
 336         int ret;
 337
 338         max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
 339                                GFP_KERNEL);
 340         if (max9850 == NULL)
 341                 return -ENOMEM;
 342
 343         i2c_set_clientdata(i2c, max9850);
 344
 345         ret = snd_soc_register_codec(&i2c->dev,
 346                         &soc_codec_dev_max9850, &max9850_dai, 1);
 347         return ret;
 348 }
 349
 350 static int max9850_i2c_remove(struct i2c_client *client)
 351 {
 352         snd_soc_unregister_codec(&client->dev);
 353         return 0;
 354 }
 355
 356 static const struct i2c_device_id max9850_i2c_id[] = {
 357         { "max9850", 0 },
 358         { }
 359 };
 360 MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
 361
 362 static struct i2c_driver max9850_i2c_driver = {
 363         .driver = {
 364                 .name = "max9850",
 365                 .owner = THIS_MODULE,
 366         },
 367         .probe = max9850_i2c_probe,
 368         .remove = max9850_i2c_remove,
 369         .id_table = max9850_i2c_id,
 370 };
 371
 372 module_i2c_driver(max9850_i2c_driver);
 373
 374 MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
 375 MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
 376 MODULE_LICENSE("GPL");