sound/soc/codecs/pcm179x.c

   1 /*
   2  * PCM179X 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
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/initval.h>
  28 #include <sound/soc.h>
  29 #include <sound/tlv.h>
  30 #include <linux/of.h>
  31
  32 #include "pcm179x.h"
  33
  34 #define PCM179X_DAC_VOL_LEFT    0x10
  35 #define PCM179X_DAC_VOL_RIGHT   0x11
  36 #define PCM179X_FMT_CONTROL     0x12
  37 #define PCM179X_MODE_CONTROL    0x13
  38 #define PCM179X_SOFT_MUTE       PCM179X_FMT_CONTROL
  39
  40 #define PCM179X_FMT_MASK        0x70
  41 #define PCM179X_FMT_SHIFT       4
  42 #define PCM179X_MUTE_MASK       0x01
  43 #define PCM179X_MUTE_SHIFT      0
  44 #define PCM179X_ATLD_ENABLE     (1 << 7)
  45
  46 static const struct reg_default pcm179x_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 pcm179x_accessible_reg(struct device *dev, unsigned int reg)
  58 {
  59         return reg >= 0x10 && reg <= 0x17;
  60 }
  61
  62 static bool pcm179x_writeable_reg(struct device *dev, unsigned int reg)
  63 {
  64         bool accessible;
  65
  66         accessible = pcm179x_accessible_reg(dev, reg);
  67
  68         return accessible && reg != 0x16 && reg != 0x17;
  69 }
  70
  71 struct pcm179x_private {
  72         struct regmap *regmap;
  73         unsigned int format;
  74         unsigned int rate;
  75 };
  76
  77 static int pcm179x_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 pcm179x_private *priv = snd_soc_codec_get_drvdata(codec);
  82
  83         priv->format = format;
  84
  85         return 0;
  86 }
  87
  88 static int pcm179x_digital_mute(struct snd_soc_dai *dai, int mute)
  89 {
  90         struct snd_soc_codec *codec = dai->codec;
  91         struct pcm179x_private *priv = snd_soc_codec_get_drvdata(codec);
  92         int ret;
  93
  94         ret = regmap_update_bits(priv->regmap, PCM179X_SOFT_MUTE,
  95                                  PCM179X_MUTE_MASK, !!mute);
  96         if (ret < 0)
  97                 return ret;
  98
  99         return 0;
 100 }
 101
 102 static int pcm179x_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 pcm179x_private *priv = snd_soc_codec_get_drvdata(codec);
 108         int val = 0, ret;
 109
 110         priv->rate = params_rate(params);
 111
 112         switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
 113         case SND_SOC_DAIFMT_RIGHT_J:
 114                 switch (params_width(params)) {
 115                 case 24:
 116                 case 32:
 117                         val = 2;
 118                         break;
 119                 case 16:
 120                         val = 0;
 121                         break;
 122                 default:
 123                         return -EINVAL;
 124                 }
 125                 break;
 126         case SND_SOC_DAIFMT_I2S:
 127                 switch (params_width(params)) {
 128                 case 24:
 129                 case 32:
 130                         val = 5;
 131                         break;
 132                 case 16:
 133                         val = 4;
 134                         break;
 135                 default:
 136                         return -EINVAL;
 137                 }
 138                 break;
 139         default:
 140                 dev_err(codec->dev, "Invalid DAI format\n");
 141                 return -EINVAL;
 142         }
 143
 144         val = val << PCM179X_FMT_SHIFT | PCM179X_ATLD_ENABLE;
 145
 146         ret = regmap_update_bits(priv->regmap, PCM179X_FMT_CONTROL,
 147                                  PCM179X_FMT_MASK | PCM179X_ATLD_ENABLE, val);
 148         if (ret < 0)
 149                 return ret;
 150
 151         return 0;
 152 }
 153
 154 static const struct snd_soc_dai_ops pcm179x_dai_ops = {
 155         .set_fmt        = pcm179x_set_dai_fmt,
 156         .hw_params      = pcm179x_hw_params,
 157         .digital_mute   = pcm179x_digital_mute,
 158 };
 159
 160 static const DECLARE_TLV_DB_SCALE(pcm179x_dac_tlv, -12000, 50, 1);
 161
 162 static const struct snd_kcontrol_new pcm179x_controls[] = {
 163         SOC_DOUBLE_R_RANGE_TLV("DAC Playback Volume", PCM179X_DAC_VOL_LEFT,
 164                          PCM179X_DAC_VOL_RIGHT, 0, 0xf, 0xff, 0,
 165                          pcm179x_dac_tlv),
 166         SOC_SINGLE("DAC Invert Output Switch", PCM179X_MODE_CONTROL, 7, 1, 0),
 167         SOC_SINGLE("DAC Rolloff Filter Switch", PCM179X_MODE_CONTROL, 1, 1, 0),
 168 };
 169
 170 static const struct snd_soc_dapm_widget pcm179x_dapm_widgets[] = {
 171 SND_SOC_DAPM_OUTPUT("IOUTL+"),
 172 SND_SOC_DAPM_OUTPUT("IOUTL-"),
 173 SND_SOC_DAPM_OUTPUT("IOUTR+"),
 174 SND_SOC_DAPM_OUTPUT("IOUTR-"),
 175 };
 176
 177 static const struct snd_soc_dapm_route pcm179x_dapm_routes[] = {
 178         { "IOUTL+", NULL, "Playback" },
 179         { "IOUTL-", NULL, "Playback" },
 180         { "IOUTR+", NULL, "Playback" },
 181         { "IOUTR-", NULL, "Playback" },
 182 };
 183
 184 static struct snd_soc_dai_driver pcm179x_dai = {
 185         .name = "pcm179x-hifi",
 186         .playback = {
 187                 .stream_name = "Playback",
 188                 .channels_min = 2,
 189                 .channels_max = 2,
 190                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
 191                 .rate_min = 10000,
 192                 .rate_max = 200000,
 193                 .formats = PCM1792A_FORMATS, },
 194         .ops = &pcm179x_dai_ops,
 195 };
 196
 197 const struct regmap_config pcm179x_regmap_config = {
 198         .reg_bits               = 8,
 199         .val_bits               = 8,
 200         .max_register           = 23,
 201         .reg_defaults           = pcm179x_reg_defaults,
 202         .num_reg_defaults       = ARRAY_SIZE(pcm179x_reg_defaults),
 203         .writeable_reg          = pcm179x_writeable_reg,
 204         .readable_reg           = pcm179x_accessible_reg,
 205 };
 206 EXPORT_SYMBOL_GPL(pcm179x_regmap_config);
 207
 208 static struct snd_soc_codec_driver soc_codec_dev_pcm179x = {
 209         .controls               = pcm179x_controls,
 210         .num_controls           = ARRAY_SIZE(pcm179x_controls),
 211         .dapm_widgets           = pcm179x_dapm_widgets,
 212         .num_dapm_widgets       = ARRAY_SIZE(pcm179x_dapm_widgets),
 213         .dapm_routes            = pcm179x_dapm_routes,
 214         .num_dapm_routes        = ARRAY_SIZE(pcm179x_dapm_routes),
 215 };
 216
 217 int pcm179x_common_init(struct device *dev, struct regmap *regmap)
 218 {
 219         struct pcm179x_private *pcm179x;
 220
 221         pcm179x = devm_kzalloc(dev, sizeof(struct pcm179x_private),
 222                                 GFP_KERNEL);
 223         if (!pcm179x)
 224                 return -ENOMEM;
 225
 226         pcm179x->regmap = regmap;
 227         dev_set_drvdata(dev, pcm179x);
 228
 229         return snd_soc_register_codec(dev,
 230                         &soc_codec_dev_pcm179x, &pcm179x_dai, 1);
 231 }
 232 EXPORT_SYMBOL_GPL(pcm179x_common_init);
 233
 234 int pcm179x_common_exit(struct device *dev)
 235 {
 236         snd_soc_unregister_codec(dev);
 237         return 0;
 238 }
 239 EXPORT_SYMBOL_GPL(pcm179x_common_exit);
 240
 241 MODULE_DESCRIPTION("ASoC PCM179X driver");
 242 MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
 243 MODULE_LICENSE("GPL");