sound/soc/codecs/ak5386.c

   1 /*
   2  * ALSA SoC driver for
   3  *    Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
   4  *
   5  * (c) 2013 Daniel Mack <zonque@gmail.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/of.h>
  15 #include <linux/of_gpio.h>
  16 #include <linux/of_device.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <sound/soc.h>
  19 #include <sound/pcm.h>
  20 #include <sound/initval.h>
  21
  22 static const char * const supply_names[] = {
  23         "va", "vd"
  24 };
  25
  26 struct ak5386_priv {
  27         int reset_gpio;
  28         struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
  29 };
  30
  31 static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
  32 SND_SOC_DAPM_INPUT("AINL"),
  33 SND_SOC_DAPM_INPUT("AINR"),
  34 };
  35
  36 static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
  37         { "Capture", NULL, "AINL" },
  38         { "Capture", NULL, "AINR" },
  39 };
  40
  41 static int ak5386_soc_probe(struct snd_soc_codec *codec)
  42 {
  43         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
  44         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  45 }
  46
  47 static int ak5386_soc_remove(struct snd_soc_codec *codec)
  48 {
  49         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
  50         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  51         return 0;
  52 }
  53
  54 #ifdef CONFIG_PM
  55 static int ak5386_soc_suspend(struct snd_soc_codec *codec)
  56 {
  57         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
  58         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  59         return 0;
  60 }
  61
  62 static int ak5386_soc_resume(struct snd_soc_codec *codec)
  63 {
  64         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
  65         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  66 }
  67 #else
  68 #define ak5386_soc_suspend      NULL
  69 #define ak5386_soc_resume       NULL
  70 #endif /* CONFIG_PM */
  71
  72 static struct snd_soc_codec_driver soc_codec_ak5386 = {
  73         .probe = ak5386_soc_probe,
  74         .remove = ak5386_soc_remove,
  75         .suspend = ak5386_soc_suspend,
  76         .resume = ak5386_soc_resume,
  77         .component_driver = {
  78                 .dapm_widgets           = ak5386_dapm_widgets,
  79                 .num_dapm_widgets       = ARRAY_SIZE(ak5386_dapm_widgets),
  80                 .dapm_routes            = ak5386_dapm_routes,
  81                 .num_dapm_routes        = ARRAY_SIZE(ak5386_dapm_routes),
  82         },
  83 };
  84
  85 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
  86                               unsigned int format)
  87 {
  88         struct snd_soc_codec *codec = codec_dai->codec;
  89
  90         format &= SND_SOC_DAIFMT_FORMAT_MASK;
  91         if (format != SND_SOC_DAIFMT_LEFT_J &&
  92             format != SND_SOC_DAIFMT_I2S) {
  93                 dev_err(codec->dev, "Invalid DAI format\n");
  94                 return -EINVAL;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static int ak5386_hw_params(struct snd_pcm_substream *substream,
 101                             struct snd_pcm_hw_params *params,
 102                             struct snd_soc_dai *dai)
 103 {
 104         struct snd_soc_codec *codec = dai->codec;
 105         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
 106
 107         /*
 108          * From the datasheet:
 109          *
 110          * All external clocks (MCLK, SCLK and LRCK) must be present unless
 111          * PDN pin = “L”. If these clocks are not provided, the AK5386 may
 112          * draw excess current due to its use of internal dynamically
 113          * refreshed logic. If the external clocks are not present, place
 114          * the AK5386 in power-down mode (PDN pin = “L”).
 115          */
 116
 117         if (gpio_is_valid(priv->reset_gpio))
 118                 gpio_set_value(priv->reset_gpio, 1);
 119
 120         return 0;
 121 }
 122
 123 static int ak5386_hw_free(struct snd_pcm_substream *substream,
 124                           struct snd_soc_dai *dai)
 125 {
 126         struct snd_soc_codec *codec = dai->codec;
 127         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
 128
 129         if (gpio_is_valid(priv->reset_gpio))
 130                 gpio_set_value(priv->reset_gpio, 0);
 131
 132         return 0;
 133 }
 134
 135 static const struct snd_soc_dai_ops ak5386_dai_ops = {
 136         .set_fmt        = ak5386_set_dai_fmt,
 137         .hw_params      = ak5386_hw_params,
 138         .hw_free        = ak5386_hw_free,
 139 };
 140
 141 static struct snd_soc_dai_driver ak5386_dai = {
 142         .name           = "ak5386-hifi",
 143         .capture        = {
 144                 .stream_name    = "Capture",
 145                 .channels_min   = 1,
 146                 .channels_max   = 2,
 147                 .rates          = SNDRV_PCM_RATE_8000_192000,
 148                 .formats        = SNDRV_PCM_FMTBIT_S8     |
 149                                   SNDRV_PCM_FMTBIT_S16_LE |
 150                                   SNDRV_PCM_FMTBIT_S24_LE |
 151                                   SNDRV_PCM_FMTBIT_S24_3LE,
 152         },
 153         .ops    = &ak5386_dai_ops,
 154 };
 155
 156 #ifdef CONFIG_OF
 157 static const struct of_device_id ak5386_dt_ids[] = {
 158         { .compatible = "asahi-kasei,ak5386", },
 159         { }
 160 };
 161 MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
 162 #endif
 163
 164 static int ak5386_probe(struct platform_device *pdev)
 165 {
 166         struct device *dev = &pdev->dev;
 167         struct ak5386_priv *priv;
 168         int ret, i;
 169
 170         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 171         if (!priv)
 172                 return -ENOMEM;
 173
 174         priv->reset_gpio = -EINVAL;
 175         dev_set_drvdata(dev, priv);
 176
 177         for (i = 0; i < ARRAY_SIZE(supply_names); i++)
 178                 priv->supplies[i].supply = supply_names[i];
 179
 180         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
 181                                       priv->supplies);
 182         if (ret < 0)
 183                 return ret;
 184
 185         if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
 186                 priv->reset_gpio = of_get_named_gpio(dev->of_node,
 187                                                       "reset-gpio", 0);
 188
 189         if (gpio_is_valid(priv->reset_gpio))
 190                 if (devm_gpio_request_one(dev, priv->reset_gpio,
 191                                           GPIOF_OUT_INIT_LOW,
 192                                           "AK5386 Reset"))
 193                         priv->reset_gpio = -EINVAL;
 194
 195         return snd_soc_register_codec(dev, &soc_codec_ak5386,
 196                                       &ak5386_dai, 1);
 197 }
 198
 199 static int ak5386_remove(struct platform_device *pdev)
 200 {
 201         snd_soc_unregister_codec(&pdev->dev);
 202         return 0;
 203 }
 204
 205 static struct platform_driver ak5386_driver = {
 206         .probe          = ak5386_probe,
 207         .remove         = ak5386_remove,
 208         .driver         = {
 209                 .name   = "ak5386",
 210                 .of_match_table = of_match_ptr(ak5386_dt_ids),
 211         },
 212 };
 213
 214 module_platform_driver(ak5386_driver);
 215
 216 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
 217 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
 218 MODULE_LICENSE("GPL");