sound/soc/codecs/si476x.c

   1 /*
   2  * sound/soc/codecs/si476x.c -- Codec driver for SI476X chips
   3  *
   4  * Copyright (C) 2012 Innovative Converged Devices(ICD)
   5  * Copyright (C) 2013 Andrey Smirnov
   6  *
   7  * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; version 2 of the License.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <sound/initval.h>
  26
  27 #include <linux/i2c.h>
  28
  29 #include <linux/mfd/si476x-core.h>
  30
  31 enum si476x_audio_registers {
  32         SI476X_DIGITAL_IO_OUTPUT_FORMAT         = 0x0203,
  33         SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE    = 0x0202,
  34 };
  35
  36 enum si476x_digital_io_output_format {
  37         SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT       = 11,
  38         SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT     = 8,
  39 };
  40
  41 #define SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK     ((0x7 << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) | \
  42                                                   (0x7 << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT))
  43 #define SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK    (0x7e)
  44
  45 enum si476x_daudio_formats {
  46         SI476X_DAUDIO_MODE_I2S          = (0x0 << 1),
  47         SI476X_DAUDIO_MODE_DSP_A        = (0x6 << 1),
  48         SI476X_DAUDIO_MODE_DSP_B        = (0x7 << 1),
  49         SI476X_DAUDIO_MODE_LEFT_J       = (0x8 << 1),
  50         SI476X_DAUDIO_MODE_RIGHT_J      = (0x9 << 1),
  51
  52         SI476X_DAUDIO_MODE_IB           = (1 << 5),
  53         SI476X_DAUDIO_MODE_IF           = (1 << 6),
  54 };
  55
  56 enum si476x_pcm_format {
  57         SI476X_PCM_FORMAT_S8            = 2,
  58         SI476X_PCM_FORMAT_S16_LE        = 4,
  59         SI476X_PCM_FORMAT_S20_3LE       = 5,
  60         SI476X_PCM_FORMAT_S24_LE        = 6,
  61 };
  62
  63 static unsigned int si476x_codec_read(struct snd_soc_codec *codec,
  64                                       unsigned int reg)
  65 {
  66         int err;
  67         unsigned int val;
  68         struct si476x_core *core = codec->control_data;
  69
  70         si476x_core_lock(core);
  71         if (!si476x_core_is_powered_up(core))
  72                 regcache_cache_only(core->regmap, true);
  73
  74         err = regmap_read(core->regmap, reg, &val);
  75
  76         if (!si476x_core_is_powered_up(core))
  77                 regcache_cache_only(core->regmap, false);
  78         si476x_core_unlock(core);
  79
  80         if (err < 0)
  81                 return err;
  82
  83         return val;
  84 }
  85
  86 static int si476x_codec_write(struct snd_soc_codec *codec,
  87                               unsigned int reg, unsigned int val)
  88 {
  89         int err;
  90         struct si476x_core *core = codec->control_data;
  91
  92         si476x_core_lock(core);
  93         if (!si476x_core_is_powered_up(core))
  94                 regcache_cache_only(core->regmap, true);
  95
  96         err = regmap_write(core->regmap, reg, val);
  97
  98         if (!si476x_core_is_powered_up(core))
  99                 regcache_cache_only(core->regmap, false);
 100         si476x_core_unlock(core);
 101
 102         return err;
 103 }
 104
 105 static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
 106                                     unsigned int fmt)
 107 {
 108         int err;
 109         u16 format = 0;
 110
 111         if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
 112                 return -EINVAL;
 113
 114         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 115         case SND_SOC_DAIFMT_DSP_A:
 116                 format |= SI476X_DAUDIO_MODE_DSP_A;
 117                 break;
 118         case SND_SOC_DAIFMT_DSP_B:
 119                 format |= SI476X_DAUDIO_MODE_DSP_B;
 120                 break;
 121         case SND_SOC_DAIFMT_I2S:
 122                 format |= SI476X_DAUDIO_MODE_I2S;
 123                 break;
 124         case SND_SOC_DAIFMT_RIGHT_J:
 125                 format |= SI476X_DAUDIO_MODE_RIGHT_J;
 126                 break;
 127         case SND_SOC_DAIFMT_LEFT_J:
 128                 format |= SI476X_DAUDIO_MODE_LEFT_J;
 129                 break;
 130         default:
 131                 return -EINVAL;
 132         }
 133
 134         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 135         case SND_SOC_DAIFMT_DSP_A:
 136         case SND_SOC_DAIFMT_DSP_B:
 137                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 138                 case SND_SOC_DAIFMT_NB_NF:
 139                         break;
 140                 case SND_SOC_DAIFMT_IB_NF:
 141                         format |= SI476X_DAUDIO_MODE_IB;
 142                         break;
 143                 default:
 144                         return -EINVAL;
 145                 }
 146                 break;
 147         case SND_SOC_DAIFMT_I2S:
 148         case SND_SOC_DAIFMT_RIGHT_J:
 149         case SND_SOC_DAIFMT_LEFT_J:
 150                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 151                 case SND_SOC_DAIFMT_NB_NF:
 152                         break;
 153                 case SND_SOC_DAIFMT_IB_IF:
 154                         format |= SI476X_DAUDIO_MODE_IB |
 155                                 SI476X_DAUDIO_MODE_IF;
 156                         break;
 157                 case SND_SOC_DAIFMT_IB_NF:
 158                         format |= SI476X_DAUDIO_MODE_IB;
 159                         break;
 160                 case SND_SOC_DAIFMT_NB_IF:
 161                         format |= SI476X_DAUDIO_MODE_IF;
 162                         break;
 163                 default:
 164                         return -EINVAL;
 165                 }
 166                 break;
 167         default:
 168                 return -EINVAL;
 169         }
 170
 171         err = snd_soc_update_bits(codec_dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 172                                   SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK,
 173                                   format);
 174         if (err < 0) {
 175                 dev_err(codec_dai->codec->dev, "Failed to set output format\n");
 176                 return err;
 177         }
 178
 179         return 0;
 180 }
 181
 182 static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
 183                                   struct snd_pcm_hw_params *params,
 184                                   struct snd_soc_dai *dai)
 185 {
 186         int rate, width, err;
 187
 188         rate = params_rate(params);
 189         if (rate < 32000 || rate > 48000) {
 190                 dev_err(dai->codec->dev, "Rate: %d is not supported\n", rate);
 191                 return -EINVAL;
 192         }
 193
 194         switch (params_format(params)) {
 195         case SNDRV_PCM_FORMAT_S8:
 196                 width = SI476X_PCM_FORMAT_S8;
 197                 break;
 198         case SNDRV_PCM_FORMAT_S16_LE:
 199                 width = SI476X_PCM_FORMAT_S16_LE;
 200                 break;
 201         case SNDRV_PCM_FORMAT_S20_3LE:
 202                 width = SI476X_PCM_FORMAT_S20_3LE;
 203                 break;
 204         case SNDRV_PCM_FORMAT_S24_LE:
 205                 width = SI476X_PCM_FORMAT_S24_LE;
 206                 break;
 207         default:
 208                 return -EINVAL;
 209         }
 210
 211         err = snd_soc_write(dai->codec, SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE,
 212                             rate);
 213         if (err < 0) {
 214                 dev_err(dai->codec->dev, "Failed to set sample rate\n");
 215                 return err;
 216         }
 217
 218         err = snd_soc_update_bits(dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 219                                   SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK,
 220                                   (width << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) |
 221                                   (width << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT));
 222         if (err < 0) {
 223                 dev_err(dai->codec->dev, "Failed to set output width\n");
 224                 return err;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static int si476x_codec_probe(struct snd_soc_codec *codec)
 231 {
 232         codec->control_data = i2c_mfd_cell_to_core(codec->dev);
 233         return 0;
 234 }
 235
 236 static struct snd_soc_dai_ops si476x_dai_ops = {
 237         .hw_params      = si476x_codec_hw_params,
 238         .set_fmt        = si476x_codec_set_dai_fmt,
 239 };
 240
 241 static struct snd_soc_dai_driver si476x_dai = {
 242         .name           = "si476x-codec",
 243         .capture        = {
 244                 .stream_name    = "Capture",
 245                 .channels_min   = 2,
 246                 .channels_max   = 2,
 247
 248                 .rates = SNDRV_PCM_RATE_32000 |
 249                 SNDRV_PCM_RATE_44100 |
 250                 SNDRV_PCM_RATE_48000,
 251                 .formats = SNDRV_PCM_FMTBIT_S8 |
 252                 SNDRV_PCM_FMTBIT_S16_LE |
 253                 SNDRV_PCM_FMTBIT_S20_3LE |
 254                 SNDRV_PCM_FMTBIT_S24_LE
 255         },
 256         .ops            = &si476x_dai_ops,
 257 };
 258
 259 static struct snd_soc_codec_driver soc_codec_dev_si476x = {
 260         .probe  = si476x_codec_probe,
 261         .read   = si476x_codec_read,
 262         .write  = si476x_codec_write,
 263 };
 264
 265 static int si476x_platform_probe(struct platform_device *pdev)
 266 {
 267         return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_si476x,
 268                                       &si476x_dai, 1);
 269 }
 270
 271 static int si476x_platform_remove(struct platform_device *pdev)
 272 {
 273         snd_soc_unregister_codec(&pdev->dev);
 274         return 0;
 275 }
 276
 277 MODULE_ALIAS("platform:si476x-codec");
 278
 279 static struct platform_driver si476x_platform_driver = {
 280         .driver         = {
 281                 .name   = "si476x-codec",
 282                 .owner  = THIS_MODULE,
 283         },
 284         .probe          = si476x_platform_probe,
 285         .remove         = si476x_platform_remove,
 286 };
 287 module_platform_driver(si476x_platform_driver);
 288
 289 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
 290 MODULE_DESCRIPTION("ASoC Si4761/64 codec driver");
 291 MODULE_LICENSE("GPL");