linux/sound/soc/codecs/max9850.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * max9850.c  --  codec driver for max9850
   4 *
   5 * Copyright (C) 2011 taskit GmbH
   6 *
   7 * Author: Christian Glindkamp <christian.glindkamp@taskit.de>
   8 *
   9 * Initial development of this code was funded by
  10 * MICRONIC Computer Systeme GmbH, http://www.mcsberlin.de/
  11 */
  12
  13#include <linux/module.h>
  14#include <linux/init.h>
  15#include <linux/i2c.h>
  16#include <linux/regmap.h>
  17#include <linux/slab.h>
  18#include <sound/pcm.h>
  19#include <sound/pcm_params.h>
  20#include <sound/soc.h>
  21#include <sound/tlv.h>
  22
  23#include "max9850.h"
  24
  25struct max9850_priv {
  26        struct regmap *regmap;
  27        unsigned int sysclk;
  28};
  29
  30/* these registers are not used at the moment but provided for the sake of
  31 * completeness */
  32static bool max9850_volatile_register(struct device *dev, unsigned int reg)
  33{
  34        switch (reg) {
  35        case MAX9850_STATUSA:
  36        case MAX9850_STATUSB:
  37                return true;
  38        default:
  39                return false;
  40        }
  41}
  42
  43static const struct regmap_config max9850_regmap = {
  44        .reg_bits = 8,
  45        .val_bits = 8,
  46
  47        .max_register = MAX9850_DIGITAL_AUDIO,
  48        .volatile_reg = max9850_volatile_register,
  49        .cache_type = REGCACHE_RBTREE,
  50};
  51
  52static const DECLARE_TLV_DB_RANGE(max9850_tlv,
  53        0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
  54        0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
  55        0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
  56        0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0)
  57);
  58
  59static const struct snd_kcontrol_new max9850_controls[] = {
  60SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
  61SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
  62SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
  63};
  64
  65static const struct snd_kcontrol_new max9850_mixer_controls[] = {
  66        SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
  67};
  68
  69static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
  70SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
  71SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
  72SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
  73SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
  74SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
  75                &max9850_mixer_controls[0],
  76                ARRAY_SIZE(max9850_mixer_controls)),
  77SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
  78SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
  79SND_SOC_DAPM_OUTPUT("OUTL"),
  80SND_SOC_DAPM_OUTPUT("HPL"),
  81SND_SOC_DAPM_OUTPUT("OUTR"),
  82SND_SOC_DAPM_OUTPUT("HPR"),
  83SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
  84SND_SOC_DAPM_INPUT("INL"),
  85SND_SOC_DAPM_INPUT("INR"),
  86};
  87
  88static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
  89        /* output mixer */
  90        {"Output Mixer", NULL, "DAC"},
  91        {"Output Mixer", "Line In Switch", "Line Input"},
  92
  93        /* outputs */
  94        {"Headphone Output", NULL, "Output Mixer"},
  95        {"HPL", NULL, "Headphone Output"},
  96        {"HPR", NULL, "Headphone Output"},
  97        {"OUTL", NULL, "Output Mixer"},
  98        {"OUTR", NULL, "Output Mixer"},
  99
 100        /* inputs */
 101        {"Line Input", NULL, "INL"},
 102        {"Line Input", NULL, "INR"},
 103
 104        /* supplies */
 105        {"Output Mixer", NULL, "Charge Pump 1"},
 106        {"Output Mixer", NULL, "Charge Pump 2"},
 107        {"Output Mixer", NULL, "SHDN"},
 108        {"DAC", NULL, "MCLK"},
 109};
 110
 111static int max9850_hw_params(struct snd_pcm_substream *substream,
 112                             struct snd_pcm_hw_params *params,
 113                             struct snd_soc_dai *dai)
 114{
 115        struct snd_soc_component *component = dai->component;
 116        struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
 117        u64 lrclk_div;
 118        u8 sf, da;
 119
 120        if (!max9850->sysclk)
 121                return -EINVAL;
 122
 123        /* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
 124        sf = (snd_soc_component_read32(component, MAX9850_CLOCK) >> 2) + 1;
 125        lrclk_div = (1 << 22);
 126        lrclk_div *= params_rate(params);
 127        lrclk_div *= sf;
 128        do_div(lrclk_div, max9850->sysclk);
 129
 130        snd_soc_component_write(component, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
 131        snd_soc_component_write(component, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
 132
 133        switch (params_width(params)) {
 134        case 16:
 135                da = 0;
 136                break;
 137        case 20:
 138                da = 0x2;
 139                break;
 140        case 24:
 141                da = 0x3;
 142                break;
 143        default:
 144                return -EINVAL;
 145        }
 146        snd_soc_component_update_bits(component, MAX9850_DIGITAL_AUDIO, 0x3, da);
 147
 148        return 0;
 149}
 150
 151static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 152                int clk_id, unsigned int freq, int dir)
 153{
 154        struct snd_soc_component *component = codec_dai->component;
 155        struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
 156
 157        /* calculate mclk -> iclk divider */
 158        if (freq <= 13000000)
 159                snd_soc_component_write(component, MAX9850_CLOCK, 0x0);
 160        else if (freq <= 26000000)
 161                snd_soc_component_write(component, MAX9850_CLOCK, 0x4);
 162        else if (freq <= 40000000)
 163                snd_soc_component_write(component, MAX9850_CLOCK, 0x8);
 164        else
 165                return -EINVAL;
 166
 167        max9850->sysclk = freq;
 168        return 0;
 169}
 170
 171static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
 172{
 173        struct snd_soc_component *component = codec_dai->component;
 174        u8 da = 0;
 175
 176        /* set master/slave audio interface */
 177        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 178        case SND_SOC_DAIFMT_CBM_CFM:
 179                da |= MAX9850_MASTER;
 180                break;
 181        case SND_SOC_DAIFMT_CBS_CFS:
 182                break;
 183        default:
 184                return -EINVAL;
 185        }
 186
 187        /* interface format */
 188        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 189        case SND_SOC_DAIFMT_I2S:
 190                da |= MAX9850_DLY;
 191                break;
 192        case SND_SOC_DAIFMT_RIGHT_J:
 193                da |= MAX9850_RTJ;
 194                break;
 195        case SND_SOC_DAIFMT_LEFT_J:
 196                break;
 197        default:
 198                return -EINVAL;
 199        }
 200
 201        /* clock inversion */
 202        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 203        case SND_SOC_DAIFMT_NB_NF:
 204                break;
 205        case SND_SOC_DAIFMT_IB_IF:
 206                da |= MAX9850_BCINV | MAX9850_INV;
 207                break;
 208        case SND_SOC_DAIFMT_IB_NF:
 209                da |= MAX9850_BCINV;
 210                break;
 211        case SND_SOC_DAIFMT_NB_IF:
 212                da |= MAX9850_INV;
 213                break;
 214        default:
 215                return -EINVAL;
 216        }
 217
 218        /* set da */
 219        snd_soc_component_write(component, MAX9850_DIGITAL_AUDIO, da);
 220
 221        return 0;
 222}
 223
 224static int max9850_set_bias_level(struct snd_soc_component *component,
 225                                  enum snd_soc_bias_level level)
 226{
 227        struct max9850_priv *max9850 = snd_soc_component_get_drvdata(component);
 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 (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
 237                        ret = regcache_sync(max9850->regmap);
 238                        if (ret) {
 239                                dev_err(component->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        return 0;
 249}
 250
 251#define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
 252
 253#define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 254        SNDRV_PCM_FMTBIT_S24_LE)
 255
 256static const struct snd_soc_dai_ops max9850_dai_ops = {
 257        .hw_params      = max9850_hw_params,
 258        .set_sysclk     = max9850_set_dai_sysclk,
 259        .set_fmt        = max9850_set_dai_fmt,
 260};
 261
 262static struct snd_soc_dai_driver max9850_dai = {
 263        .name = "max9850-hifi",
 264        .playback = {
 265                .stream_name = "Playback",
 266                .channels_min = 1,
 267                .channels_max = 2,
 268                .rates = MAX9850_RATES,
 269                .formats = MAX9850_FORMATS
 270        },
 271        .ops = &max9850_dai_ops,
 272};
 273
 274static int max9850_probe(struct snd_soc_component *component)
 275{
 276        /* enable zero-detect */
 277        snd_soc_component_update_bits(component, MAX9850_GENERAL_PURPOSE, 1, 1);
 278        /* enable slew-rate control */
 279        snd_soc_component_update_bits(component, MAX9850_VOLUME, 0x40, 0x40);
 280        /* set slew-rate 125ms */
 281        snd_soc_component_update_bits(component, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
 282
 283        return 0;
 284}
 285
 286static const struct snd_soc_component_driver soc_component_dev_max9850 = {
 287        .probe                  = max9850_probe,
 288        .set_bias_level         = max9850_set_bias_level,
 289        .controls               = max9850_controls,
 290        .num_controls           = ARRAY_SIZE(max9850_controls),
 291        .dapm_widgets           = max9850_dapm_widgets,
 292        .num_dapm_widgets       = ARRAY_SIZE(max9850_dapm_widgets),
 293        .dapm_routes            = max9850_dapm_routes,
 294        .num_dapm_routes        = ARRAY_SIZE(max9850_dapm_routes),
 295        .suspend_bias_off       = 1,
 296        .idle_bias_on           = 1,
 297        .use_pmdown_time        = 1,
 298        .endianness             = 1,
 299        .non_legacy_dai_naming  = 1,
 300};
 301
 302static int max9850_i2c_probe(struct i2c_client *i2c,
 303                             const struct i2c_device_id *id)
 304{
 305        struct max9850_priv *max9850;
 306        int ret;
 307
 308        max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
 309                               GFP_KERNEL);
 310        if (max9850 == NULL)
 311                return -ENOMEM;
 312
 313        max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap);
 314        if (IS_ERR(max9850->regmap))
 315                return PTR_ERR(max9850->regmap);
 316
 317        i2c_set_clientdata(i2c, max9850);
 318
 319        ret = devm_snd_soc_register_component(&i2c->dev,
 320                        &soc_component_dev_max9850, &max9850_dai, 1);
 321        return ret;
 322}
 323
 324static const struct i2c_device_id max9850_i2c_id[] = {
 325        { "max9850", 0 },
 326        { }
 327};
 328MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
 329
 330static struct i2c_driver max9850_i2c_driver = {
 331        .driver = {
 332                .name = "max9850",
 333        },
 334        .probe = max9850_i2c_probe,
 335        .id_table = max9850_i2c_id,
 336};
 337
 338module_i2c_driver(max9850_i2c_driver);
 339
 340MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
 341MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
 342MODULE_LICENSE("GPL");
 343