kernel/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         .dapm_widgets = ak5386_dapm_widgets,
  78         .num_dapm_widgets = ARRAY_SIZE(ak5386_dapm_widgets),
  79         .dapm_routes = ak5386_dapm_routes,
  80         .num_dapm_routes = ARRAY_SIZE(ak5386_dapm_routes),
  81 };
  82
  83 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
  84                               unsigned int format)
  85 {
  86         struct snd_soc_codec *codec = codec_dai->codec;
  87
  88         format &= SND_SOC_DAIFMT_FORMAT_MASK;
  89         if (format != SND_SOC_DAIFMT_LEFT_J &&
  90             format != SND_SOC_DAIFMT_I2S) {
  91                 dev_err(codec->dev, "Invalid DAI format\n");
  92                 return -EINVAL;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int ak5386_hw_params(struct snd_pcm_substream *substream,
  99                             struct snd_pcm_hw_params *params,
 100                             struct snd_soc_dai *dai)
 101 {
 102         struct snd_soc_codec *codec = dai->codec;
 103         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
 104
 105         /*
 106          * From the datasheet:
 107          *
 108          * All external clocks (MCLK, SCLK and LRCK) must be present unless
 109          * PDN pin = “L”. If these clocks are not provided, the AK5386 may
 110          * draw excess current due to its use of internal dynamically
 111          * refreshed logic. If the external clocks are not present, place
 112          * the AK5386 in power-down mode (PDN pin = “L”).
 113          */
 114
 115         if (gpio_is_valid(priv->reset_gpio))
 116                 gpio_set_value(priv->reset_gpio, 1);
 117
 118         return 0;
 119 }
 120
 121 static int ak5386_hw_free(struct snd_pcm_substream *substream,
 122                           struct snd_soc_dai *dai)
 123 {
 124         struct snd_soc_codec *codec = dai->codec;
 125         struct ak5386_priv *priv = snd_soc_codec_get_drvdata(codec);
 126
 127         if (gpio_is_valid(priv->reset_gpio))
 128                 gpio_set_value(priv->reset_gpio, 0);
 129
 130         return 0;
 131 }
 132
 133 static const struct snd_soc_dai_ops ak5386_dai_ops = {
 134         .set_fmt        = ak5386_set_dai_fmt,
 135         .hw_params      = ak5386_hw_params,
 136         .hw_free        = ak5386_hw_free,
 137 };
 138
 139 static struct snd_soc_dai_driver ak5386_dai = {
 140         .name           = "ak5386-hifi",
 141         .capture        = {
 142                 .stream_name    = "Capture",
 143                 .channels_min   = 1,
 144                 .channels_max   = 2,
 145                 .rates          = SNDRV_PCM_RATE_8000_192000,
 146                 .formats        = SNDRV_PCM_FMTBIT_S8     |
 147                                   SNDRV_PCM_FMTBIT_S16_LE |
 148                                   SNDRV_PCM_FMTBIT_S24_LE |
 149                                   SNDRV_PCM_FMTBIT_S24_3LE,
 150         },
 151         .ops    = &ak5386_dai_ops,
 152 };
 153
 154 #ifdef CONFIG_OF
 155 static const struct of_device_id ak5386_dt_ids[] = {
 156         { .compatible = "asahi-kasei,ak5386", },
 157         { }
 158 };
 159 MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
 160 #endif
 161
 162 static int ak5386_probe(struct platform_device *pdev)
 163 {
 164         struct device *dev = &pdev->dev;
 165         struct ak5386_priv *priv;
 166         int ret, i;
 167
 168         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 169         if (!priv)
 170                 return -ENOMEM;
 171
 172         priv->reset_gpio = -EINVAL;
 173         dev_set_drvdata(dev, priv);
 174
 175         for (i = 0; i < ARRAY_SIZE(supply_names); i++)
 176                 priv->supplies[i].supply = supply_names[i];
 177
 178         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
 179                                       priv->supplies);
 180         if (ret < 0)
 181                 return ret;
 182
 183         if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
 184                 priv->reset_gpio = of_get_named_gpio(dev->of_node,
 185                                                       "reset-gpio", 0);
 186
 187         if (gpio_is_valid(priv->reset_gpio))
 188                 if (devm_gpio_request_one(dev, priv->reset_gpio,
 189                                           GPIOF_OUT_INIT_LOW,
 190                                           "AK5386 Reset"))
 191                         priv->reset_gpio = -EINVAL;
 192
 193         return snd_soc_register_codec(dev, &soc_codec_ak5386,
 194                                       &ak5386_dai, 1);
 195 }
 196
 197 static int ak5386_remove(struct platform_device *pdev)
 198 {
 199         snd_soc_unregister_codec(&pdev->dev);
 200         return 0;
 201 }
 202
 203 static struct platform_driver ak5386_driver = {
 204         .probe          = ak5386_probe,
 205         .remove         = ak5386_remove,
 206         .driver         = {
 207                 .name   = "ak5386",
 208                 .of_match_table = of_match_ptr(ak5386_dt_ids),
 209         },
 210 };
 211
 212 module_platform_driver(ak5386_driver);
 213
 214 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
 215 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
 216 MODULE_LICENSE("GPL");