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 const struct snd_soc_dapm_widget si476x_dapm_widgets[] = {
 106 SND_SOC_DAPM_OUTPUT("LOUT"),
 107 SND_SOC_DAPM_OUTPUT("ROUT"),
 108 };
 109
 110 static const struct snd_soc_dapm_route si476x_dapm_routes[] = {
 111         { "Capture", NULL, "LOUT" },
 112         { "Capture", NULL, "ROUT" },
 113 };
 114
 115 static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
 116                                     unsigned int fmt)
 117 {
 118         int err;
 119         u16 format = 0;
 120
 121         if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
 122                 return -EINVAL;
 123
 124         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 125         case SND_SOC_DAIFMT_DSP_A:
 126                 format |= SI476X_DAUDIO_MODE_DSP_A;
 127                 break;
 128         case SND_SOC_DAIFMT_DSP_B:
 129                 format |= SI476X_DAUDIO_MODE_DSP_B;
 130                 break;
 131         case SND_SOC_DAIFMT_I2S:
 132                 format |= SI476X_DAUDIO_MODE_I2S;
 133                 break;
 134         case SND_SOC_DAIFMT_RIGHT_J:
 135                 format |= SI476X_DAUDIO_MODE_RIGHT_J;
 136                 break;
 137         case SND_SOC_DAIFMT_LEFT_J:
 138                 format |= SI476X_DAUDIO_MODE_LEFT_J;
 139                 break;
 140         default:
 141                 return -EINVAL;
 142         }
 143
 144         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 145         case SND_SOC_DAIFMT_DSP_A:
 146         case SND_SOC_DAIFMT_DSP_B:
 147                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 148                 case SND_SOC_DAIFMT_NB_NF:
 149                         break;
 150                 case SND_SOC_DAIFMT_IB_NF:
 151                         format |= SI476X_DAUDIO_MODE_IB;
 152                         break;
 153                 default:
 154                         return -EINVAL;
 155                 }
 156                 break;
 157         case SND_SOC_DAIFMT_I2S:
 158         case SND_SOC_DAIFMT_RIGHT_J:
 159         case SND_SOC_DAIFMT_LEFT_J:
 160                 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 161                 case SND_SOC_DAIFMT_NB_NF:
 162                         break;
 163                 case SND_SOC_DAIFMT_IB_IF:
 164                         format |= SI476X_DAUDIO_MODE_IB |
 165                                 SI476X_DAUDIO_MODE_IF;
 166                         break;
 167                 case SND_SOC_DAIFMT_IB_NF:
 168                         format |= SI476X_DAUDIO_MODE_IB;
 169                         break;
 170                 case SND_SOC_DAIFMT_NB_IF:
 171                         format |= SI476X_DAUDIO_MODE_IF;
 172                         break;
 173                 default:
 174                         return -EINVAL;
 175                 }
 176                 break;
 177         default:
 178                 return -EINVAL;
 179         }
 180
 181         err = snd_soc_update_bits(codec_dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 182                                   SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK,
 183                                   format);
 184         if (err < 0) {
 185                 dev_err(codec_dai->codec->dev, "Failed to set output format\n");
 186                 return err;
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
 193                                   struct snd_pcm_hw_params *params,
 194                                   struct snd_soc_dai *dai)
 195 {
 196         int rate, width, err;
 197
 198         rate = params_rate(params);
 199         if (rate < 32000 || rate > 48000) {
 200                 dev_err(dai->codec->dev, "Rate: %d is not supported\n", rate);
 201                 return -EINVAL;
 202         }
 203
 204         switch (params_format(params)) {
 205         case SNDRV_PCM_FORMAT_S8:
 206                 width = SI476X_PCM_FORMAT_S8;
 207                 break;
 208         case SNDRV_PCM_FORMAT_S16_LE:
 209                 width = SI476X_PCM_FORMAT_S16_LE;
 210                 break;
 211         case SNDRV_PCM_FORMAT_S20_3LE:
 212                 width = SI476X_PCM_FORMAT_S20_3LE;
 213                 break;
 214         case SNDRV_PCM_FORMAT_S24_LE:
 215                 width = SI476X_PCM_FORMAT_S24_LE;
 216                 break;
 217         default:
 218                 return -EINVAL;
 219         }
 220
 221         err = snd_soc_write(dai->codec, SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE,
 222                             rate);
 223         if (err < 0) {
 224                 dev_err(dai->codec->dev, "Failed to set sample rate\n");
 225                 return err;
 226         }
 227
 228         err = snd_soc_update_bits(dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
 229                                   SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK,
 230                                   (width << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) |
 231                                   (width << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT));
 232         if (err < 0) {
 233                 dev_err(dai->codec->dev, "Failed to set output width\n");
 234                 return err;
 235         }
 236
 237         return 0;
 238 }
 239
 240 static int si476x_codec_probe(struct snd_soc_codec *codec)
 241 {
 242         codec->control_data = i2c_mfd_cell_to_core(codec->dev);
 243         return 0;
 244 }
 245
 246 static struct snd_soc_dai_ops si476x_dai_ops = {
 247         .hw_params      = si476x_codec_hw_params,
 248         .set_fmt        = si476x_codec_set_dai_fmt,
 249 };
 250
 251 static struct snd_soc_dai_driver si476x_dai = {
 252         .name           = "si476x-codec",
 253         .capture        = {
 254                 .stream_name    = "Capture",
 255                 .channels_min   = 2,
 256                 .channels_max   = 2,
 257
 258                 .rates = SNDRV_PCM_RATE_32000 |
 259                 SNDRV_PCM_RATE_44100 |
 260                 SNDRV_PCM_RATE_48000,
 261                 .formats = SNDRV_PCM_FMTBIT_S8 |
 262                 SNDRV_PCM_FMTBIT_S16_LE |
 263                 SNDRV_PCM_FMTBIT_S20_3LE |
 264                 SNDRV_PCM_FMTBIT_S24_LE
 265         },
 266         .ops            = &si476x_dai_ops,
 267 };
 268
 269 static struct snd_soc_codec_driver soc_codec_dev_si476x = {
 270         .probe  = si476x_codec_probe,
 271         .read   = si476x_codec_read,
 272         .write  = si476x_codec_write,
 273         .dapm_widgets = si476x_dapm_widgets,
 274         .num_dapm_widgets = ARRAY_SIZE(si476x_dapm_widgets),
 275         .dapm_routes = si476x_dapm_routes,
 276         .num_dapm_routes = ARRAY_SIZE(si476x_dapm_routes),
 277 };
 278
 279 static int si476x_platform_probe(struct platform_device *pdev)
 280 {
 281         return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_si476x,
 282                                       &si476x_dai, 1);
 283 }
 284
 285 static int si476x_platform_remove(struct platform_device *pdev)
 286 {
 287         snd_soc_unregister_codec(&pdev->dev);
 288         return 0;
 289 }
 290
 291 MODULE_ALIAS("platform:si476x-codec");
 292
 293 static struct platform_driver si476x_platform_driver = {
 294         .driver         = {
 295                 .name   = "si476x-codec",
 296                 .owner  = THIS_MODULE,
 297         },
 298         .probe          = si476x_platform_probe,
 299         .remove         = si476x_platform_remove,
 300 };
 301 module_platform_driver(si476x_platform_driver);
 302
 303 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
 304 MODULE_DESCRIPTION("ASoC Si4761/64 codec driver");
 305 MODULE_LICENSE("GPL");