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 <linux/regmap.h>
  25 #include <sound/soc.h>
  26 #include <sound/initval.h>
  27
  28 #include <linux/i2c.h>
  29
  30 #include <linux/mfd/si476x-core.h>
  31
  32 enum si476x_audio_registers {
  33         SI476X_DIGITAL_IO_OUTPUT_FORMAT         = 0x0203,
  34         SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE    = 0x0202,
  35 };
  36
  37 enum si476x_digital_io_output_format {
  38         SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT       = 11,
  39         SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT     = 8,
  40 };
  41
  42 #define SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK     ((0x7 << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) | \
  43                                                   (0x7 << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT))
  44 #define SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK    (0x7e)
  45
  46 enum si476x_daudio_formats {
  47         SI476X_DAUDIO_MODE_I2S          = (0x0 << 1),
  48         SI476X_DAUDIO_MODE_DSP_A        = (0x6 << 1),
  49         SI476X_DAUDIO_MODE_DSP_B        = (0x7 << 1),
  50         SI476X_DAUDIO_MODE_LEFT_J       = (0x8 << 1),
  51         SI476X_DAUDIO_MODE_RIGHT_J      = (0x9 << 1),
  52
  53         SI476X_DAUDIO_MODE_IB           = (1 << 5),
  54         SI476X_DAUDIO_MODE_IF           = (1 << 6),
  55 };
  56
  57 enum si476x_pcm_format {
  58         SI476X_PCM_FORMAT_S8            = 2,
  59         SI476X_PCM_FORMAT_S16_LE        = 4,
  60         SI476X_PCM_FORMAT_S20_3LE       = 5,
  61         SI476X_PCM_FORMAT_S24_LE        = 6,
  62 };
  63
  64 static const struct snd_soc_dapm_widget si476x_dapm_widgets[] = {
  65 SND_SOC_DAPM_OUTPUT("LOUT"),
  66 SND_SOC_DAPM_OUTPUT("ROUT"),
  67 };
  68
  69 static const struct snd_soc_dapm_route si476x_dapm_routes[] = {
  70         { "Capture", NULL, "LOUT" },
  71         { "Capture", NULL, "ROUT" },
  72 };
  73
  74 static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
  75                                     unsigned int fmt)
  76 {
  77         struct si476x_core *core = i2c_mfd_cell_to_core(codec_dai->dev);
  78         int err;
  79         u16 format = 0;
  80
  81         if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
  82                 return -EINVAL;
  83
  84         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  85         case SND_SOC_DAIFMT_DSP_A:
  86                 format |= SI476X_DAUDIO_MODE_DSP_A;
  87                 break;
  88         case SND_SOC_DAIFMT_DSP_B:
  89                 format |= SI476X_DAUDIO_MODE_DSP_B;
  90                 break;
  91         case SND_SOC_DAIFMT_I2S:
  92                 format |= SI476X_DAUDIO_MODE_I2S;
  93                 break;
  94         case SND_SOC_DAIFMT_RIGHT_J:
  95                 format |= SI476X_DAUDIO_MODE_RIGHT_J;
  96                 break;
  97         case SND_SOC_DAIFMT_LEFT_J:
  98                 format |= SI476X_DAUDIO_MODE_LEFT_J;
  99                 break;
 100         default:
 101                 return -EINVAL;
 102         }
 103
 104         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 105         case SND_SOC_DAIFMT_DSP_A:
 106         case SND_SOC_DAIFMT_DSP_B:
 107                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 108                 case SND_SOC_DAIFMT_NB_NF:
 109                         break;
 110                 case SND_SOC_DAIFMT_IB_NF:
 111                         format |= SI476X_DAUDIO_MODE_IB;
 112                         break;
 113                 default:
 114                         return -EINVAL;
 115                 }
 116                 break;
 117         case SND_SOC_DAIFMT_I2S:
 118         case SND_SOC_DAIFMT_RIGHT_J:
 119         case SND_SOC_DAIFMT_LEFT_J:
 120                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 121                 case SND_SOC_DAIFMT_NB_NF:
 122                         break;
 123                 case SND_SOC_DAIFMT_IB_IF:
 124                         format |= SI476X_DAUDIO_MODE_IB |
 125                                 SI476X_DAUDIO_MODE_IF;
 126                         break;
 127                 case SND_SOC_DAIFMT_IB_NF:
 128                         format |= SI476X_DAUDIO_MODE_IB;
 129                         break;
 130                 case SND_SOC_DAIFMT_NB_IF:
 131                         format |= SI476X_DAUDIO_MODE_IF;
 132                         break;
 133                 default:
 134                         return -EINVAL;
 135                 }
 136                 break;
 137         default:
 138                 return -EINVAL;
 139         }
 140
 141         si476x_core_lock(core);
 142
 143         err = snd_soc_update_bits(codec_dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 144                                   SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK,
 145                                   format);
 146
 147         si476x_core_unlock(core);
 148
 149         if (err < 0) {
 150                 dev_err(codec_dai->codec->dev, "Failed to set output format\n");
 151                 return err;
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
 158                                   struct snd_pcm_hw_params *params,
 159                                   struct snd_soc_dai *dai)
 160 {
 161         struct si476x_core *core = i2c_mfd_cell_to_core(dai->dev);
 162         int rate, width, err;
 163
 164         rate = params_rate(params);
 165         if (rate < 32000 || rate > 48000) {
 166                 dev_err(dai->codec->dev, "Rate: %d is not supported\n", rate);
 167                 return -EINVAL;
 168         }
 169
 170         switch (params_width(params)) {
 171         case 8:
 172                 width = SI476X_PCM_FORMAT_S8;
 173                 break;
 174         case 16:
 175                 width = SI476X_PCM_FORMAT_S16_LE;
 176                 break;
 177         case 20:
 178                 width = SI476X_PCM_FORMAT_S20_3LE;
 179                 break;
 180         case 24:
 181                 width = SI476X_PCM_FORMAT_S24_LE;
 182                 break;
 183         default:
 184                 return -EINVAL;
 185         }
 186
 187         si476x_core_lock(core);
 188
 189         err = snd_soc_write(dai->codec, SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE,
 190                             rate);
 191         if (err < 0) {
 192                 dev_err(dai->codec->dev, "Failed to set sample rate\n");
 193                 goto out;
 194         }
 195
 196         err = snd_soc_update_bits(dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 197                                   SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK,
 198                                   (width << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) |
 199                                   (width << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT));
 200         if (err < 0) {
 201                 dev_err(dai->codec->dev, "Failed to set output width\n");
 202                 goto out;
 203         }
 204
 205 out:
 206         si476x_core_unlock(core);
 207
 208         return err;
 209 }
 210
 211 static const struct snd_soc_dai_ops si476x_dai_ops = {
 212         .hw_params      = si476x_codec_hw_params,
 213         .set_fmt        = si476x_codec_set_dai_fmt,
 214 };
 215
 216 static struct snd_soc_dai_driver si476x_dai = {
 217         .name           = "si476x-codec",
 218         .capture        = {
 219                 .stream_name    = "Capture",
 220                 .channels_min   = 2,
 221                 .channels_max   = 2,
 222
 223                 .rates = SNDRV_PCM_RATE_32000 |
 224                 SNDRV_PCM_RATE_44100 |
 225                 SNDRV_PCM_RATE_48000,
 226                 .formats = SNDRV_PCM_FMTBIT_S8 |
 227                 SNDRV_PCM_FMTBIT_S16_LE |
 228                 SNDRV_PCM_FMTBIT_S20_3LE |
 229                 SNDRV_PCM_FMTBIT_S24_LE
 230         },
 231         .ops            = &si476x_dai_ops,
 232 };
 233
 234 static struct regmap *si476x_get_regmap(struct device *dev)
 235 {
 236         return dev_get_regmap(dev->parent, NULL);
 237 }
 238
 239 static struct snd_soc_codec_driver soc_codec_dev_si476x = {
 240         .get_regmap = si476x_get_regmap,
 241         .dapm_widgets = si476x_dapm_widgets,
 242         .num_dapm_widgets = ARRAY_SIZE(si476x_dapm_widgets),
 243         .dapm_routes = si476x_dapm_routes,
 244         .num_dapm_routes = ARRAY_SIZE(si476x_dapm_routes),
 245 };
 246
 247 static int si476x_platform_probe(struct platform_device *pdev)
 248 {
 249         return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_si476x,
 250                                       &si476x_dai, 1);
 251 }
 252
 253 static int si476x_platform_remove(struct platform_device *pdev)
 254 {
 255         snd_soc_unregister_codec(&pdev->dev);
 256         return 0;
 257 }
 258
 259 MODULE_ALIAS("platform:si476x-codec");
 260
 261 static struct platform_driver si476x_platform_driver = {
 262         .driver         = {
 263                 .name   = "si476x-codec",
 264         },
 265         .probe          = si476x_platform_probe,
 266         .remove         = si476x_platform_remove,
 267 };
 268 module_platform_driver(si476x_platform_driver);
 269
 270 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
 271 MODULE_DESCRIPTION("ASoC Si4761/64 codec driver");
 272 MODULE_LICENSE("GPL");