sound/soc/codecs/pcm1792a.c

   1 /*
   2  * PCM1792A ASoC codec driver
   3  *
   4  * Copyright (c) Amarula Solutions B.V. 2013
   5  *
   6  *     Michael Trimarchi <michael@amarulasolutions.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21 #include <linux/kernel.h>
  22 #include <linux/device.h>
  23 #include <linux/spi/spi.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/initval.h>
  29 #include <sound/soc.h>
  30 #include <sound/tlv.h>
  31 #include <linux/of_device.h>
  32
  33 #include "pcm1792a.h"
  34
  35 #define PCM1792A_DAC_VOL_LEFT   0x10
  36 #define PCM1792A_DAC_VOL_RIGHT  0x11
  37 #define PCM1792A_FMT_CONTROL    0x12
  38 #define PCM1792A_SOFT_MUTE      PCM1792A_FMT_CONTROL
  39
  40 #define PCM1792A_FMT_MASK       0x70
  41 #define PCM1792A_FMT_SHIFT      4
  42 #define PCM1792A_MUTE_MASK      0x01
  43 #define PCM1792A_MUTE_SHIFT     0
  44 #define PCM1792A_ATLD_ENABLE    (1 << 7)
  45
  46 static const struct reg_default pcm1792a_reg_defaults[] = {
  47         { 0x10, 0xff },
  48         { 0x11, 0xff },
  49         { 0x12, 0x50 },
  50         { 0x13, 0x00 },
  51         { 0x14, 0x00 },
  52         { 0x15, 0x01 },
  53         { 0x16, 0x00 },
  54         { 0x17, 0x00 },
  55 };
  56
  57 static bool pcm1792a_accessible_reg(struct device *dev, unsigned int reg)
  58 {
  59         return reg >= 0x10 && reg <= 0x17;
  60 }
  61
  62 static bool pcm1792a_writeable_reg(struct device *dev, unsigned register reg)
  63 {
  64         bool accessible;
  65
  66         accessible = pcm1792a_accessible_reg(dev, reg);
  67
  68         return accessible && reg != 0x16 && reg != 0x17;
  69 }
  70
  71 struct pcm1792a_private {
  72         struct regmap *regmap;
  73         unsigned int format;
  74         unsigned int rate;
  75 };
  76
  77 static int pcm1792a_set_dai_fmt(struct snd_soc_dai *codec_dai,
  78                              unsigned int format)
  79 {
  80         struct snd_soc_codec *codec = codec_dai->codec;
  81         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
  82
  83         priv->format = format;
  84
  85         return 0;
  86 }
  87
  88 static int pcm1792a_digital_mute(struct snd_soc_dai *dai, int mute)
  89 {
  90         struct snd_soc_codec *codec = dai->codec;
  91         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
  92         int ret;
  93
  94         ret = regmap_update_bits(priv->regmap, PCM1792A_SOFT_MUTE,
  95                                  PCM1792A_MUTE_MASK, !!mute);
  96         if (ret < 0)
  97                 return ret;
  98
  99         return 0;
 100 }
 101
 102 static int pcm1792a_hw_params(struct snd_pcm_substream *substream,
 103                              struct snd_pcm_hw_params *params,
 104                              struct snd_soc_dai *dai)
 105 {
 106         struct snd_soc_codec *codec = dai->codec;
 107         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
 108         int val = 0, ret;
 109         int pcm_format = params_format(params);
 110
 111         priv->rate = params_rate(params);
 112
 113         switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
 114         case SND_SOC_DAIFMT_RIGHT_J:
 115                 if (pcm_format == SNDRV_PCM_FORMAT_S24_LE ||
 116                     pcm_format == SNDRV_PCM_FORMAT_S32_LE)
 117                         val = 0x02;
 118                 else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
 119                         val = 0x00;
 120                 break;
 121         case SND_SOC_DAIFMT_I2S:
 122                 if (pcm_format == SNDRV_PCM_FORMAT_S24_LE ||
 123                     pcm_format == SNDRV_PCM_FORMAT_S32_LE)
 124                         val = 0x05;
 125                 else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
 126                         val = 0x04;
 127                 break;
 128         default:
 129                 dev_err(codec->dev, "Invalid DAI format\n");
 130                 return -EINVAL;
 131         }
 132
 133         val = val << PCM1792A_FMT_SHIFT | PCM1792A_ATLD_ENABLE;
 134
 135         ret = regmap_update_bits(priv->regmap, PCM1792A_FMT_CONTROL,
 136                                  PCM1792A_FMT_MASK | PCM1792A_ATLD_ENABLE, val);
 137         if (ret < 0)
 138                 return ret;
 139
 140         return 0;
 141 }
 142
 143 static const struct snd_soc_dai_ops pcm1792a_dai_ops = {
 144         .set_fmt        = pcm1792a_set_dai_fmt,
 145         .hw_params      = pcm1792a_hw_params,
 146         .digital_mute   = pcm1792a_digital_mute,
 147 };
 148
 149 static const DECLARE_TLV_DB_SCALE(pcm1792a_dac_tlv, -12000, 50, 1);
 150
 151 static const struct snd_kcontrol_new pcm1792a_controls[] = {
 152         SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1792A_DAC_VOL_LEFT,
 153                          PCM1792A_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
 154                          pcm1792a_dac_tlv),
 155 };
 156
 157 static const struct snd_soc_dapm_widget pcm1792a_dapm_widgets[] = {
 158 SND_SOC_DAPM_OUTPUT("IOUTL+"),
 159 SND_SOC_DAPM_OUTPUT("IOUTL-"),
 160 SND_SOC_DAPM_OUTPUT("IOUTR+"),
 161 SND_SOC_DAPM_OUTPUT("IOUTR-"),
 162 };
 163
 164 static const struct snd_soc_dapm_route pcm1792a_dapm_routes[] = {
 165         { "IOUTL+", NULL, "Playback" },
 166         { "IOUTL-", NULL, "Playback" },
 167         { "IOUTR+", NULL, "Playback" },
 168         { "IOUTR-", NULL, "Playback" },
 169 };
 170
 171 static struct snd_soc_dai_driver pcm1792a_dai = {
 172         .name = "pcm1792a-hifi",
 173         .playback = {
 174                 .stream_name = "Playback",
 175                 .channels_min = 2,
 176                 .channels_max = 2,
 177                 .rates = PCM1792A_RATES,
 178                 .formats = PCM1792A_FORMATS, },
 179         .ops = &pcm1792a_dai_ops,
 180 };
 181
 182 static const struct of_device_id pcm1792a_of_match[] = {
 183         { .compatible = "ti,pcm1792a", },
 184         { }
 185 };
 186 MODULE_DEVICE_TABLE(of, pcm1792a_of_match);
 187
 188 static const struct regmap_config pcm1792a_regmap = {
 189         .reg_bits               = 8,
 190         .val_bits               = 8,
 191         .max_register           = 23,
 192         .reg_defaults           = pcm1792a_reg_defaults,
 193         .num_reg_defaults       = ARRAY_SIZE(pcm1792a_reg_defaults),
 194         .writeable_reg          = pcm1792a_writeable_reg,
 195         .readable_reg           = pcm1792a_accessible_reg,
 196 };
 197
 198 static struct snd_soc_codec_driver soc_codec_dev_pcm1792a = {
 199         .controls               = pcm1792a_controls,
 200         .num_controls           = ARRAY_SIZE(pcm1792a_controls),
 201         .dapm_widgets           = pcm1792a_dapm_widgets,
 202         .num_dapm_widgets       = ARRAY_SIZE(pcm1792a_dapm_widgets),
 203         .dapm_routes            = pcm1792a_dapm_routes,
 204         .num_dapm_routes        = ARRAY_SIZE(pcm1792a_dapm_routes),
 205 };
 206
 207 static int pcm1792a_spi_probe(struct spi_device *spi)
 208 {
 209         struct pcm1792a_private *pcm1792a;
 210         int ret;
 211
 212         pcm1792a = devm_kzalloc(&spi->dev, sizeof(struct pcm1792a_private),
 213                                 GFP_KERNEL);
 214         if (!pcm1792a)
 215                 return -ENOMEM;
 216
 217         spi_set_drvdata(spi, pcm1792a);
 218
 219         pcm1792a->regmap = devm_regmap_init_spi(spi, &pcm1792a_regmap);
 220         if (IS_ERR(pcm1792a->regmap)) {
 221                 ret = PTR_ERR(pcm1792a->regmap);
 222                 dev_err(&spi->dev, "Failed to register regmap: %d\n", ret);
 223                 return ret;
 224         }
 225
 226         return snd_soc_register_codec(&spi->dev,
 227                         &soc_codec_dev_pcm1792a, &pcm1792a_dai, 1);
 228 }
 229
 230 static int pcm1792a_spi_remove(struct spi_device *spi)
 231 {
 232         snd_soc_unregister_codec(&spi->dev);
 233         return 0;
 234 }
 235
 236 static const struct spi_device_id pcm1792a_spi_ids[] = {
 237         { "pcm1792a", 0 },
 238         { },
 239 };
 240 MODULE_DEVICE_TABLE(spi, pcm1792a_spi_ids);
 241
 242 static struct spi_driver pcm1792a_codec_driver = {
 243         .driver = {
 244                 .name = "pcm1792a",
 245                 .owner = THIS_MODULE,
 246                 .of_match_table = of_match_ptr(pcm1792a_of_match),
 247         },
 248         .id_table = pcm1792a_spi_ids,
 249         .probe = pcm1792a_spi_probe,
 250         .remove = pcm1792a_spi_remove,
 251 };
 252
 253 module_spi_driver(pcm1792a_codec_driver);
 254
 255 MODULE_DESCRIPTION("ASoC PCM1792A driver");
 256 MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
 257 MODULE_LICENSE("GPL");