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_component *component)
  42 {
  43         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  44         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  45 }
  46
  47 static void ak5386_soc_remove(struct snd_soc_component *component)
  48 {
  49         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  50         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  51 }
  52
  53 #ifdef CONFIG_PM
  54 static int ak5386_soc_suspend(struct snd_soc_component *component)
  55 {
  56         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  57         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  58         return 0;
  59 }
  60
  61 static int ak5386_soc_resume(struct snd_soc_component *component)
  62 {
  63         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  64         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  65 }
  66 #else
  67 #define ak5386_soc_suspend      NULL
  68 #define ak5386_soc_resume       NULL
  69 #endif /* CONFIG_PM */
  70
  71 static const struct snd_soc_component_driver soc_component_ak5386 = {
  72         .probe                  = ak5386_soc_probe,
  73         .remove                 = ak5386_soc_remove,
  74         .suspend                = ak5386_soc_suspend,
  75         .resume                 = ak5386_soc_resume,
  76         .dapm_widgets           = ak5386_dapm_widgets,
  77         .num_dapm_widgets       = ARRAY_SIZE(ak5386_dapm_widgets),
  78         .dapm_routes            = ak5386_dapm_routes,
  79         .num_dapm_routes        = ARRAY_SIZE(ak5386_dapm_routes),
  80         .idle_bias_on           = 1,
  81         .use_pmdown_time        = 1,
  82         .endianness             = 1,
  83         .non_legacy_dai_naming  = 1,
  84 };
  85
  86 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
  87                               unsigned int format)
  88 {
  89         struct snd_soc_component *component = codec_dai->component;
  90
  91         format &= SND_SOC_DAIFMT_FORMAT_MASK;
  92         if (format != SND_SOC_DAIFMT_LEFT_J &&
  93             format != SND_SOC_DAIFMT_I2S) {
  94                 dev_err(component->dev, "Invalid DAI format\n");
  95                 return -EINVAL;
  96         }
  97
  98         return 0;
  99 }
 100
 101 static int ak5386_hw_params(struct snd_pcm_substream *substream,
 102                             struct snd_pcm_hw_params *params,
 103                             struct snd_soc_dai *dai)
 104 {
 105         struct snd_soc_component *component = dai->component;
 106         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
 107
 108         /*
 109          * From the datasheet:
 110          *
 111          * All external clocks (MCLK, SCLK and LRCK) must be present unless
 112          * PDN pin = “L”. If these clocks are not provided, the AK5386 may
 113          * draw excess current due to its use of internal dynamically
 114          * refreshed logic. If the external clocks are not present, place
 115          * the AK5386 in power-down mode (PDN pin = “L”).
 116          */
 117
 118         if (gpio_is_valid(priv->reset_gpio))
 119                 gpio_set_value(priv->reset_gpio, 1);
 120
 121         return 0;
 122 }
 123
 124 static int ak5386_hw_free(struct snd_pcm_substream *substream,
 125                           struct snd_soc_dai *dai)
 126 {
 127         struct snd_soc_component *component = dai->component;
 128         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
 129
 130         if (gpio_is_valid(priv->reset_gpio))
 131                 gpio_set_value(priv->reset_gpio, 0);
 132
 133         return 0;
 134 }
 135
 136 static const struct snd_soc_dai_ops ak5386_dai_ops = {
 137         .set_fmt        = ak5386_set_dai_fmt,
 138         .hw_params      = ak5386_hw_params,
 139         .hw_free        = ak5386_hw_free,
 140 };
 141
 142 static struct snd_soc_dai_driver ak5386_dai = {
 143         .name           = "ak5386-hifi",
 144         .capture        = {
 145                 .stream_name    = "Capture",
 146                 .channels_min   = 1,
 147                 .channels_max   = 2,
 148                 .rates          = SNDRV_PCM_RATE_8000_192000,
 149                 .formats        = SNDRV_PCM_FMTBIT_S8     |
 150                                   SNDRV_PCM_FMTBIT_S16_LE |
 151                                   SNDRV_PCM_FMTBIT_S24_LE |
 152                                   SNDRV_PCM_FMTBIT_S24_3LE,
 153         },
 154         .ops    = &ak5386_dai_ops,
 155 };
 156
 157 #ifdef CONFIG_OF
 158 static const struct of_device_id ak5386_dt_ids[] = {
 159         { .compatible = "asahi-kasei,ak5386", },
 160         { }
 161 };
 162 MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
 163 #endif
 164
 165 static int ak5386_probe(struct platform_device *pdev)
 166 {
 167         struct device *dev = &pdev->dev;
 168         struct ak5386_priv *priv;
 169         int ret, i;
 170
 171         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 172         if (!priv)
 173                 return -ENOMEM;
 174
 175         priv->reset_gpio = -EINVAL;
 176         dev_set_drvdata(dev, priv);
 177
 178         for (i = 0; i < ARRAY_SIZE(supply_names); i++)
 179                 priv->supplies[i].supply = supply_names[i];
 180
 181         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
 182                                       priv->supplies);
 183         if (ret < 0)
 184                 return ret;
 185
 186         if (of_match_device(of_match_ptr(ak5386_dt_ids), dev))
 187                 priv->reset_gpio = of_get_named_gpio(dev->of_node,
 188                                                       "reset-gpio", 0);
 189
 190         if (gpio_is_valid(priv->reset_gpio))
 191                 if (devm_gpio_request_one(dev, priv->reset_gpio,
 192                                           GPIOF_OUT_INIT_LOW,
 193                                           "AK5386 Reset"))
 194                         priv->reset_gpio = -EINVAL;
 195
 196         return devm_snd_soc_register_component(dev, &soc_component_ak5386,
 197                                       &ak5386_dai, 1);
 198 }
 199
 200 static struct platform_driver ak5386_driver = {
 201         .probe          = ak5386_probe,
 202         .driver         = {
 203                 .name   = "ak5386",
 204                 .of_match_table = of_match_ptr(ak5386_dt_ids),
 205         },
 206 };
 207
 208 module_platform_driver(ak5386_driver);
 209
 210 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
 211 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
 212 MODULE_LICENSE("GPL");