sound/soc/codecs/pcm1681.c

   1 /*
   2  * PCM1681 ASoC codec driver
   3  *
   4  * Copyright (c) StreamUnlimited GmbH 2013
   5  *      Marek Belisko <marek.belisko@streamunlimited.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/delay.h>
  21 #include <linux/gpio.h>
  22 #include <linux/i2c.h>
  23 #include <linux/regmap.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_gpio.h>
  26 #include <sound/pcm.h>
  27 #include <sound/pcm_params.h>
  28 #include <sound/soc.h>
  29 #include <sound/tlv.h>
  30
  31 #define PCM1681_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE  |         \
  32                              SNDRV_PCM_FMTBIT_S24_LE)
  33
  34 #define PCM1681_PCM_RATES   (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | \
  35                              SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100  | \
  36                              SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200  | \
  37                              SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000)
  38
  39 #define PCM1681_SOFT_MUTE_ALL           0xff
  40 #define PCM1681_DEEMPH_RATE_MASK        0x18
  41 #define PCM1681_DEEMPH_MASK             0x01
  42
  43 #define PCM1681_ATT_CONTROL(X)  (X <= 6 ? X : X + 9) /* Attenuation level */
  44 #define PCM1681_SOFT_MUTE       0x07    /* Soft mute control register */
  45 #define PCM1681_DAC_CONTROL     0x08    /* DAC operation control */
  46 #define PCM1681_FMT_CONTROL     0x09    /* Audio interface data format */
  47 #define PCM1681_DEEMPH_CONTROL  0x0a    /* De-emphasis control */
  48 #define PCM1681_ZERO_DETECT_STATUS      0x0e    /* Zero detect status reg */
  49
  50 static const struct reg_default pcm1681_reg_defaults[] = {
  51         { 0x01, 0xff },
  52         { 0x02, 0xff },
  53         { 0x03, 0xff },
  54         { 0x04, 0xff },
  55         { 0x05, 0xff },
  56         { 0x06, 0xff },
  57         { 0x07, 0x00 },
  58         { 0x08, 0x00 },
  59         { 0x09, 0x06 },
  60         { 0x0A, 0x00 },
  61         { 0x0B, 0xff },
  62         { 0x0C, 0x0f },
  63         { 0x0D, 0x00 },
  64         { 0x10, 0xff },
  65         { 0x11, 0xff },
  66         { 0x12, 0x00 },
  67         { 0x13, 0x00 },
  68 };
  69
  70 static bool pcm1681_accessible_reg(struct device *dev, unsigned int reg)
  71 {
  72         return !((reg == 0x00) || (reg == 0x0f));
  73 }
  74
  75 static bool pcm1681_writeable_reg(struct device *dev, unsigned register reg)
  76 {
  77         return pcm1681_accessible_reg(dev, reg) &&
  78                 (reg != PCM1681_ZERO_DETECT_STATUS);
  79 }
  80
  81 struct pcm1681_private {
  82         struct regmap *regmap;
  83         unsigned int format;
  84         /* Current deemphasis status */
  85         unsigned int deemph;
  86         /* Current rate for deemphasis control */
  87         unsigned int rate;
  88 };
  89
  90 static const int pcm1681_deemph[] = { 44100, 48000, 32000 };
  91
  92 static int pcm1681_set_deemph(struct snd_soc_codec *codec)
  93 {
  94         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
  95         int i = 0, val = -1, enable = 0;
  96
  97         if (priv->deemph)
  98                 for (i = 0; i < ARRAY_SIZE(pcm1681_deemph); i++)
  99                         if (pcm1681_deemph[i] == priv->rate)
 100                                 val = i;
 101
 102         if (val != -1) {
 103                 regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
 104                                         PCM1681_DEEMPH_RATE_MASK, val);
 105                 enable = 1;
 106         } else
 107                 enable = 0;
 108
 109         /* enable/disable deemphasis functionality */
 110         return regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
 111                                         PCM1681_DEEMPH_MASK, enable);
 112 }
 113
 114 static int pcm1681_get_deemph(struct snd_kcontrol *kcontrol,
 115                               struct snd_ctl_elem_value *ucontrol)
 116 {
 117         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 118         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
 119
 120         ucontrol->value.enumerated.item[0] = priv->deemph;
 121
 122         return 0;
 123 }
 124
 125 static int pcm1681_put_deemph(struct snd_kcontrol *kcontrol,
 126                               struct snd_ctl_elem_value *ucontrol)
 127 {
 128         struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
 129         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
 130
 131         priv->deemph = ucontrol->value.enumerated.item[0];
 132
 133         return pcm1681_set_deemph(codec);
 134 }
 135
 136 static int pcm1681_set_dai_fmt(struct snd_soc_dai *codec_dai,
 137                               unsigned int format)
 138 {
 139         struct snd_soc_codec *codec = codec_dai->codec;
 140         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
 141
 142         /* The PCM1681 can only be slave to all clocks */
 143         if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
 144                 dev_err(codec->dev, "Invalid clocking mode\n");
 145                 return -EINVAL;
 146         }
 147
 148         priv->format = format;
 149
 150         return 0;
 151 }
 152
 153 static int pcm1681_digital_mute(struct snd_soc_dai *dai, int mute)
 154 {
 155         struct snd_soc_codec *codec = dai->codec;
 156         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
 157         int val;
 158
 159         if (mute)
 160                 val = PCM1681_SOFT_MUTE_ALL;
 161         else
 162                 val = 0;
 163
 164         return regmap_write(priv->regmap, PCM1681_SOFT_MUTE, val);
 165 }
 166
 167 static int pcm1681_hw_params(struct snd_pcm_substream *substream,
 168                              struct snd_pcm_hw_params *params,
 169                              struct snd_soc_dai *dai)
 170 {
 171         struct snd_soc_codec *codec = dai->codec;
 172         struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
 173         int val = 0, ret;
 174         int pcm_format = params_format(params);
 175
 176         priv->rate = params_rate(params);
 177
 178         switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
 179         case SND_SOC_DAIFMT_RIGHT_J:
 180                 if (pcm_format == SNDRV_PCM_FORMAT_S24_LE)
 181                         val = 0x00;
 182                 else if (pcm_format == SNDRV_PCM_FORMAT_S16_LE)
 183                         val = 0x03;
 184                 break;
 185         case SND_SOC_DAIFMT_I2S:
 186                 val = 0x04;
 187                 break;
 188         case SND_SOC_DAIFMT_LEFT_J:
 189                 val = 0x05;
 190                 break;
 191         default:
 192                 dev_err(codec->dev, "Invalid DAI format\n");
 193                 return -EINVAL;
 194         }
 195
 196         ret = regmap_update_bits(priv->regmap, PCM1681_FMT_CONTROL, 0x0f, val);
 197         if (ret < 0)
 198                 return ret;
 199
 200         return pcm1681_set_deemph(codec);
 201 }
 202
 203 static const struct snd_soc_dai_ops pcm1681_dai_ops = {
 204         .set_fmt        = pcm1681_set_dai_fmt,
 205         .hw_params      = pcm1681_hw_params,
 206         .digital_mute   = pcm1681_digital_mute,
 207 };
 208
 209 static const DECLARE_TLV_DB_SCALE(pcm1681_dac_tlv, -6350, 50, 1);
 210
 211 static const struct snd_kcontrol_new pcm1681_controls[] = {
 212         SOC_DOUBLE_R_TLV("Channel 1/2 Playback Volume",
 213                         PCM1681_ATT_CONTROL(1), PCM1681_ATT_CONTROL(2), 0,
 214                         0x7f, 0, pcm1681_dac_tlv),
 215         SOC_DOUBLE_R_TLV("Channel 3/4 Playback Volume",
 216                         PCM1681_ATT_CONTROL(3), PCM1681_ATT_CONTROL(4), 0,
 217                         0x7f, 0, pcm1681_dac_tlv),
 218         SOC_DOUBLE_R_TLV("Channel 5/6 Playback Volume",
 219                         PCM1681_ATT_CONTROL(5), PCM1681_ATT_CONTROL(6), 0,
 220                         0x7f, 0, pcm1681_dac_tlv),
 221         SOC_DOUBLE_R_TLV("Channel 7/8 Playback Volume",
 222                         PCM1681_ATT_CONTROL(7), PCM1681_ATT_CONTROL(8), 0,
 223                         0x7f, 0, pcm1681_dac_tlv),
 224         SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
 225                             pcm1681_get_deemph, pcm1681_put_deemph),
 226 };
 227
 228 struct snd_soc_dai_driver pcm1681_dai = {
 229         .name = "pcm1681-hifi",
 230         .playback = {
 231                 .stream_name = "Playback",
 232                 .channels_min = 2,
 233                 .channels_max = 8,
 234                 .rates = PCM1681_PCM_RATES,
 235                 .formats = PCM1681_PCM_FORMATS,
 236         },
 237         .ops = &pcm1681_dai_ops,
 238 };
 239
 240 #ifdef CONFIG_OF
 241 static const struct of_device_id pcm1681_dt_ids[] = {
 242         { .compatible = "ti,pcm1681", },
 243         { }
 244 };
 245 MODULE_DEVICE_TABLE(of, pcm1681_dt_ids);
 246 #endif
 247
 248 static const struct regmap_config pcm1681_regmap = {
 249         .reg_bits               = 8,
 250         .val_bits               = 8,
 251         .max_register           = ARRAY_SIZE(pcm1681_reg_defaults) + 1,
 252         .reg_defaults           = pcm1681_reg_defaults,
 253         .num_reg_defaults       = ARRAY_SIZE(pcm1681_reg_defaults),
 254         .writeable_reg          = pcm1681_writeable_reg,
 255         .readable_reg           = pcm1681_accessible_reg,
 256 };
 257
 258 static struct snd_soc_codec_driver soc_codec_dev_pcm1681 = {
 259         .controls               = pcm1681_controls,
 260         .num_controls           = ARRAY_SIZE(pcm1681_controls),
 261 };
 262
 263 static const struct i2c_device_id pcm1681_i2c_id[] = {
 264         {"pcm1681", 0},
 265         {}
 266 };
 267 MODULE_DEVICE_TABLE(i2c, pcm1681_i2c_id);
 268
 269 static int pcm1681_i2c_probe(struct i2c_client *client,
 270                               const struct i2c_device_id *id)
 271 {
 272         int ret;
 273         struct pcm1681_private *priv;
 274
 275         priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
 276         if (!priv)
 277                 return -ENOMEM;
 278
 279         priv->regmap = devm_regmap_init_i2c(client, &pcm1681_regmap);
 280         if (IS_ERR(priv->regmap)) {
 281                 ret = PTR_ERR(priv->regmap);
 282                 dev_err(&client->dev, "Failed to create regmap: %d\n", ret);
 283                 return ret;
 284         }
 285
 286         i2c_set_clientdata(client, priv);
 287
 288         return snd_soc_register_codec(&client->dev, &soc_codec_dev_pcm1681,
 289                 &pcm1681_dai, 1);
 290 }
 291
 292 static int pcm1681_i2c_remove(struct i2c_client *client)
 293 {
 294         snd_soc_unregister_codec(&client->dev);
 295         return 0;
 296 }
 297
 298 static struct i2c_driver pcm1681_i2c_driver = {
 299         .driver = {
 300                 .name   = "pcm1681",
 301                 .owner  = THIS_MODULE,
 302                 .of_match_table = of_match_ptr(pcm1681_dt_ids),
 303         },
 304         .id_table       = pcm1681_i2c_id,
 305         .probe          = pcm1681_i2c_probe,
 306         .remove         = pcm1681_i2c_remove,
 307 };
 308
 309 module_i2c_driver(pcm1681_i2c_driver);
 310
 311 MODULE_DESCRIPTION("Texas Instruments PCM1681 ALSA SoC Codec Driver");
 312 MODULE_AUTHOR("Marek Belisko <marek.belisko@streamunlimited.com>");
 313 MODULE_LICENSE("GPL");