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 const struct snd_soc_dapm_widget si476x_dapm_widgets[] = {
  64 SND_SOC_DAPM_OUTPUT("LOUT"),
  65 SND_SOC_DAPM_OUTPUT("ROUT"),
  66 };
  67
  68 static const struct snd_soc_dapm_route si476x_dapm_routes[] = {
  69         { "Capture", NULL, "LOUT" },
  70         { "Capture", NULL, "ROUT" },
  71 };
  72
  73 static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
  74                                     unsigned int fmt)
  75 {
  76         int err;
  77         u16 format = 0;
  78
  79         if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
  80                 return -EINVAL;
  81
  82         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  83         case SND_SOC_DAIFMT_DSP_A:
  84                 format |= SI476X_DAUDIO_MODE_DSP_A;
  85                 break;
  86         case SND_SOC_DAIFMT_DSP_B:
  87                 format |= SI476X_DAUDIO_MODE_DSP_B;
  88                 break;
  89         case SND_SOC_DAIFMT_I2S:
  90                 format |= SI476X_DAUDIO_MODE_I2S;
  91                 break;
  92         case SND_SOC_DAIFMT_RIGHT_J:
  93                 format |= SI476X_DAUDIO_MODE_RIGHT_J;
  94                 break;
  95         case SND_SOC_DAIFMT_LEFT_J:
  96                 format |= SI476X_DAUDIO_MODE_LEFT_J;
  97                 break;
  98         default:
  99                 return -EINVAL;
 100         }
 101
 102         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 103         case SND_SOC_DAIFMT_DSP_A:
 104         case SND_SOC_DAIFMT_DSP_B:
 105                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 106                 case SND_SOC_DAIFMT_NB_NF:
 107                         break;
 108                 case SND_SOC_DAIFMT_IB_NF:
 109                         format |= SI476X_DAUDIO_MODE_IB;
 110                         break;
 111                 default:
 112                         return -EINVAL;
 113                 }
 114                 break;
 115         case SND_SOC_DAIFMT_I2S:
 116         case SND_SOC_DAIFMT_RIGHT_J:
 117         case SND_SOC_DAIFMT_LEFT_J:
 118                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 119                 case SND_SOC_DAIFMT_NB_NF:
 120                         break;
 121                 case SND_SOC_DAIFMT_IB_IF:
 122                         format |= SI476X_DAUDIO_MODE_IB |
 123                                 SI476X_DAUDIO_MODE_IF;
 124                         break;
 125                 case SND_SOC_DAIFMT_IB_NF:
 126                         format |= SI476X_DAUDIO_MODE_IB;
 127                         break;
 128                 case SND_SOC_DAIFMT_NB_IF:
 129                         format |= SI476X_DAUDIO_MODE_IF;
 130                         break;
 131                 default:
 132                         return -EINVAL;
 133                 }
 134                 break;
 135         default:
 136                 return -EINVAL;
 137         }
 138
 139         err = snd_soc_update_bits(codec_dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 140                                   SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK,
 141                                   format);
 142         if (err < 0) {
 143                 dev_err(codec_dai->codec->dev, "Failed to set output format\n");
 144                 return err;
 145         }
 146
 147         return 0;
 148 }
 149
 150 static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
 151                                   struct snd_pcm_hw_params *params,
 152                                   struct snd_soc_dai *dai)
 153 {
 154         int rate, width, err;
 155
 156         rate = params_rate(params);
 157         if (rate < 32000 || rate > 48000) {
 158                 dev_err(dai->codec->dev, "Rate: %d is not supported\n", rate);
 159                 return -EINVAL;
 160         }
 161
 162         switch (params_format(params)) {
 163         case SNDRV_PCM_FORMAT_S8:
 164                 width = SI476X_PCM_FORMAT_S8;
 165                 break;
 166         case SNDRV_PCM_FORMAT_S16_LE:
 167                 width = SI476X_PCM_FORMAT_S16_LE;
 168                 break;
 169         case SNDRV_PCM_FORMAT_S20_3LE:
 170                 width = SI476X_PCM_FORMAT_S20_3LE;
 171                 break;
 172         case SNDRV_PCM_FORMAT_S24_LE:
 173                 width = SI476X_PCM_FORMAT_S24_LE;
 174                 break;
 175         default:
 176                 return -EINVAL;
 177         }
 178
 179         err = snd_soc_write(dai->codec, SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE,
 180                             rate);
 181         if (err < 0) {
 182                 dev_err(dai->codec->dev, "Failed to set sample rate\n");
 183                 return err;
 184         }
 185
 186         err = snd_soc_update_bits(dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 187                                   SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK,
 188                                   (width << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) |
 189                                   (width << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT));
 190         if (err < 0) {
 191                 dev_err(dai->codec->dev, "Failed to set output width\n");
 192                 return err;
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int si476x_codec_probe(struct snd_soc_codec *codec)
 199 {
 200         codec->control_data = dev_get_regmap(codec->dev->parent, NULL);
 201         return 0;
 202 }
 203
 204 static struct snd_soc_dai_ops si476x_dai_ops = {
 205         .hw_params      = si476x_codec_hw_params,
 206         .set_fmt        = si476x_codec_set_dai_fmt,
 207 };
 208
 209 static struct snd_soc_dai_driver si476x_dai = {
 210         .name           = "si476x-codec",
 211         .capture        = {
 212                 .stream_name    = "Capture",
 213                 .channels_min   = 2,
 214                 .channels_max   = 2,
 215
 216                 .rates = SNDRV_PCM_RATE_32000 |
 217                 SNDRV_PCM_RATE_44100 |
 218                 SNDRV_PCM_RATE_48000,
 219                 .formats = SNDRV_PCM_FMTBIT_S8 |
 220                 SNDRV_PCM_FMTBIT_S16_LE |
 221                 SNDRV_PCM_FMTBIT_S20_3LE |
 222                 SNDRV_PCM_FMTBIT_S24_LE
 223         },
 224         .ops            = &si476x_dai_ops,
 225 };
 226
 227 static struct snd_soc_codec_driver soc_codec_dev_si476x = {
 228         .probe  = si476x_codec_probe,
 229         .dapm_widgets = si476x_dapm_widgets,
 230         .num_dapm_widgets = ARRAY_SIZE(si476x_dapm_widgets),
 231         .dapm_routes = si476x_dapm_routes,
 232         .num_dapm_routes = ARRAY_SIZE(si476x_dapm_routes),
 233 };
 234
 235 static int si476x_platform_probe(struct platform_device *pdev)
 236 {
 237         return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_si476x,
 238                                       &si476x_dai, 1);
 239 }
 240
 241 static int si476x_platform_remove(struct platform_device *pdev)
 242 {
 243         snd_soc_unregister_codec(&pdev->dev);
 244         return 0;
 245 }
 246
 247 MODULE_ALIAS("platform:si476x-codec");
 248
 249 static struct platform_driver si476x_platform_driver = {
 250         .driver         = {
 251                 .name   = "si476x-codec",
 252                 .owner  = THIS_MODULE,
 253         },
 254         .probe          = si476x_platform_probe,
 255         .remove         = si476x_platform_remove,
 256 };
 257 module_platform_driver(si476x_platform_driver);
 258
 259 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
 260 MODULE_DESCRIPTION("ASoC Si4761/64 codec driver");
 261 MODULE_LICENSE("GPL");