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.h>
  32 #include <linux/of_device.h>
  33
  34 #include "pcm1792a.h"
  35
  36 #define PCM1792A_DAC_VOL_LEFT   0x10
  37 #define PCM1792A_DAC_VOL_RIGHT  0x11
  38 #define PCM1792A_FMT_CONTROL    0x12
  39 #define PCM1792A_SOFT_MUTE      PCM1792A_FMT_CONTROL
  40
  41 #define PCM1792A_FMT_MASK       0x70
  42 #define PCM1792A_FMT_SHIFT      4
  43 #define PCM1792A_MUTE_MASK      0x01
  44 #define PCM1792A_MUTE_SHIFT     0
  45 #define PCM1792A_ATLD_ENABLE    (1 << 7)
  46
  47 static const struct reg_default pcm1792a_reg_defaults[] = {
  48         { 0x10, 0xff },
  49         { 0x11, 0xff },
  50         { 0x12, 0x50 },
  51         { 0x13, 0x00 },
  52         { 0x14, 0x00 },
  53         { 0x15, 0x01 },
  54         { 0x16, 0x00 },
  55         { 0x17, 0x00 },
  56 };
  57
  58 static bool pcm1792a_accessible_reg(struct device *dev, unsigned int reg)
  59 {
  60         return reg >= 0x10 && reg <= 0x17;
  61 }
  62
  63 static bool pcm1792a_writeable_reg(struct device *dev, unsigned register reg)
  64 {
  65         bool accessible;
  66
  67         accessible = pcm1792a_accessible_reg(dev, reg);
  68
  69         return accessible && reg != 0x16 && reg != 0x17;
  70 }
  71
  72 struct pcm1792a_private {
  73         struct regmap *regmap;
  74         unsigned int format;
  75         unsigned int rate;
  76 };
  77
  78 static int pcm1792a_set_dai_fmt(struct snd_soc_dai *codec_dai,
  79                              unsigned int format)
  80 {
  81         struct snd_soc_codec *codec = codec_dai->codec;
  82         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
  83
  84         priv->format = format;
  85
  86         return 0;
  87 }
  88
  89 static int pcm1792a_digital_mute(struct snd_soc_dai *dai, int mute)
  90 {
  91         struct snd_soc_codec *codec = dai->codec;
  92         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
  93         int ret;
  94
  95         ret = regmap_update_bits(priv->regmap, PCM1792A_SOFT_MUTE,
  96                                  PCM1792A_MUTE_MASK, !!mute);
  97         if (ret < 0)
  98                 return ret;
  99
 100         return 0;
 101 }
 102
 103 static int pcm1792a_hw_params(struct snd_pcm_substream *substream,
 104                              struct snd_pcm_hw_params *params,
 105                              struct snd_soc_dai *dai)
 106 {
 107         struct snd_soc_codec *codec = dai->codec;
 108         struct pcm1792a_private *priv = snd_soc_codec_get_drvdata(codec);
 109         int val = 0, ret;
 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                 switch (params_width(params)) {
 116                 case 24:
 117                 case 32:
 118                         val = 2;
 119                         break;
 120                 case 16:
 121                         val = 0;
 122                         break;
 123                 default:
 124                         return -EINVAL;
 125                 }
 126                 break;
 127         case SND_SOC_DAIFMT_I2S:
 128                 switch (params_width(params)) {
 129                 case 24:
 130                 case 32:
 131                         val = 5;
 132                         break;
 133                 case 16:
 134                         val = 4;
 135                         break;
 136                 default:
 137                         return -EINVAL;
 138                 }
 139                 break;
 140         default:
 141                 dev_err(codec->dev, "Invalid DAI format\n");
 142                 return -EINVAL;
 143         }
 144
 145         val = val << PCM1792A_FMT_SHIFT | PCM1792A_ATLD_ENABLE;
 146
 147         ret = regmap_update_bits(priv->regmap, PCM1792A_FMT_CONTROL,
 148                                  PCM1792A_FMT_MASK | PCM1792A_ATLD_ENABLE, val);
 149         if (ret < 0)
 150                 return ret;
 151
 152         return 0;
 153 }
 154
 155 static const struct snd_soc_dai_ops pcm1792a_dai_ops = {
 156         .set_fmt        = pcm1792a_set_dai_fmt,
 157         .hw_params      = pcm1792a_hw_params,
 158         .digital_mute   = pcm1792a_digital_mute,
 159 };
 160
 161 static const DECLARE_TLV_DB_SCALE(pcm1792a_dac_tlv, -12000, 50, 1);
 162
 163 static const struct snd_kcontrol_new pcm1792a_controls[] = {
 164         SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM1792A_DAC_VOL_LEFT,
 165                          PCM1792A_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
 166                          pcm1792a_dac_tlv),
 167 };
 168
 169 static const struct snd_soc_dapm_widget pcm1792a_dapm_widgets[] = {
 170 SND_SOC_DAPM_OUTPUT("IOUTL+"),
 171 SND_SOC_DAPM_OUTPUT("IOUTL-"),
 172 SND_SOC_DAPM_OUTPUT("IOUTR+"),
 173 SND_SOC_DAPM_OUTPUT("IOUTR-"),
 174 };
 175
 176 static const struct snd_soc_dapm_route pcm1792a_dapm_routes[] = {
 177         { "IOUTL+", NULL, "Playback" },
 178         { "IOUTL-", NULL, "Playback" },
 179         { "IOUTR+", NULL, "Playback" },
 180         { "IOUTR-", NULL, "Playback" },
 181 };
 182
 183 static struct snd_soc_dai_driver pcm1792a_dai = {
 184         .name = "pcm1792a-hifi",
 185         .playback = {
 186                 .stream_name = "Playback",
 187                 .channels_min = 2,
 188                 .channels_max = 2,
 189                 .rates = PCM1792A_RATES,
 190                 .formats = PCM1792A_FORMATS, },
 191         .ops = &pcm1792a_dai_ops,
 192 };
 193
 194 static const struct of_device_id pcm1792a_of_match[] = {
 195         { .compatible = "ti,pcm1792a", },
 196         { }
 197 };
 198 MODULE_DEVICE_TABLE(of, pcm1792a_of_match);
 199
 200 static const struct regmap_config pcm1792a_regmap = {
 201         .reg_bits               = 8,
 202         .val_bits               = 8,
 203         .max_register           = 23,
 204         .reg_defaults           = pcm1792a_reg_defaults,
 205         .num_reg_defaults       = ARRAY_SIZE(pcm1792a_reg_defaults),
 206         .writeable_reg          = pcm1792a_writeable_reg,
 207         .readable_reg           = pcm1792a_accessible_reg,
 208 };
 209
 210 static struct snd_soc_codec_driver soc_codec_dev_pcm1792a = {
 211         .controls               = pcm1792a_controls,
 212         .num_controls           = ARRAY_SIZE(pcm1792a_controls),
 213         .dapm_widgets           = pcm1792a_dapm_widgets,
 214         .num_dapm_widgets       = ARRAY_SIZE(pcm1792a_dapm_widgets),
 215         .dapm_routes            = pcm1792a_dapm_routes,
 216         .num_dapm_routes        = ARRAY_SIZE(pcm1792a_dapm_routes),
 217 };
 218
 219 static int pcm1792a_spi_probe(struct spi_device *spi)
 220 {
 221         struct pcm1792a_private *pcm1792a;
 222         int ret;
 223
 224         pcm1792a = devm_kzalloc(&spi->dev, sizeof(struct pcm1792a_private),
 225                                 GFP_KERNEL);
 226         if (!pcm1792a)
 227                 return -ENOMEM;
 228
 229         spi_set_drvdata(spi, pcm1792a);
 230
 231         pcm1792a->regmap = devm_regmap_init_spi(spi, &pcm1792a_regmap);
 232         if (IS_ERR(pcm1792a->regmap)) {
 233                 ret = PTR_ERR(pcm1792a->regmap);
 234                 dev_err(&spi->dev, "Failed to register regmap: %d\n", ret);
 235                 return ret;
 236         }
 237
 238         return snd_soc_register_codec(&spi->dev,
 239                         &soc_codec_dev_pcm1792a, &pcm1792a_dai, 1);
 240 }
 241
 242 static int pcm1792a_spi_remove(struct spi_device *spi)
 243 {
 244         snd_soc_unregister_codec(&spi->dev);
 245         return 0;
 246 }
 247
 248 static const struct spi_device_id pcm1792a_spi_ids[] = {
 249         { "pcm1792a", 0 },
 250         { },
 251 };
 252 MODULE_DEVICE_TABLE(spi, pcm1792a_spi_ids);
 253
 254 static struct spi_driver pcm1792a_codec_driver = {
 255         .driver = {
 256                 .name = "pcm1792a",
 257                 .owner = THIS_MODULE,
 258                 .of_match_table = of_match_ptr(pcm1792a_of_match),
 259         },
 260         .id_table = pcm1792a_spi_ids,
 261         .probe = pcm1792a_spi_probe,
 262         .remove = pcm1792a_spi_remove,
 263 };
 264
 265 module_spi_driver(pcm1792a_codec_driver);
 266
 267 MODULE_DESCRIPTION("ASoC PCM1792A driver");
 268 MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
 269 MODULE_LICENSE("GPL");