sound/soc/codecs/ak5386.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ALSA SoC driver for
   4  *    Asahi Kasei AK5386 Single-ended 24-Bit 192kHz delta-sigma ADC
   5  *
   6  * (c) 2013 Daniel Mack <zonque@gmail.com>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11 #include <linux/of.h>
  12 #include <linux/of_gpio.h>
  13 #include <linux/regulator/consumer.h>
  14 #include <sound/soc.h>
  15 #include <sound/pcm.h>
  16 #include <sound/initval.h>
  17
  18 static const char * const supply_names[] = {
  19         "va", "vd"
  20 };
  21
  22 struct ak5386_priv {
  23         int reset_gpio;
  24         struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
  25 };
  26
  27 static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
  28 SND_SOC_DAPM_INPUT("AINL"),
  29 SND_SOC_DAPM_INPUT("AINR"),
  30 };
  31
  32 static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
  33         { "Capture", NULL, "AINL" },
  34         { "Capture", NULL, "AINR" },
  35 };
  36
  37 static int ak5386_soc_probe(struct snd_soc_component *component)
  38 {
  39         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  40         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  41 }
  42
  43 static void ak5386_soc_remove(struct snd_soc_component *component)
  44 {
  45         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  46         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  47 }
  48
  49 #ifdef CONFIG_PM
  50 static int ak5386_soc_suspend(struct snd_soc_component *component)
  51 {
  52         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  53         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  54         return 0;
  55 }
  56
  57 static int ak5386_soc_resume(struct snd_soc_component *component)
  58 {
  59         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
  60         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  61 }
  62 #else
  63 #define ak5386_soc_suspend      NULL
  64 #define ak5386_soc_resume       NULL
  65 #endif /* CONFIG_PM */
  66
  67 static const struct snd_soc_component_driver soc_component_ak5386 = {
  68         .probe                  = ak5386_soc_probe,
  69         .remove                 = ak5386_soc_remove,
  70         .suspend                = ak5386_soc_suspend,
  71         .resume                 = ak5386_soc_resume,
  72         .dapm_widgets           = ak5386_dapm_widgets,
  73         .num_dapm_widgets       = ARRAY_SIZE(ak5386_dapm_widgets),
  74         .dapm_routes            = ak5386_dapm_routes,
  75         .num_dapm_routes        = ARRAY_SIZE(ak5386_dapm_routes),
  76         .idle_bias_on           = 1,
  77         .use_pmdown_time        = 1,
  78         .endianness             = 1,
  79 };
  80
  81 static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
  82                               unsigned int format)
  83 {
  84         struct snd_soc_component *component = codec_dai->component;
  85
  86         format &= SND_SOC_DAIFMT_FORMAT_MASK;
  87         if (format != SND_SOC_DAIFMT_LEFT_J &&
  88             format != SND_SOC_DAIFMT_I2S) {
  89                 dev_err(component->dev, "Invalid DAI format\n");
  90                 return -EINVAL;
  91         }
  92
  93         return 0;
  94 }
  95
  96 static int ak5386_hw_params(struct snd_pcm_substream *substream,
  97                             struct snd_pcm_hw_params *params,
  98                             struct snd_soc_dai *dai)
  99 {
 100         struct snd_soc_component *component = dai->component;
 101         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
 102
 103         /*
 104          * From the datasheet:
 105          *
 106          * All external clocks (MCLK, SCLK and LRCK) must be present unless
 107          * PDN pin = “L”. If these clocks are not provided, the AK5386 may
 108          * draw excess current due to its use of internal dynamically
 109          * refreshed logic. If the external clocks are not present, place
 110          * the AK5386 in power-down mode (PDN pin = “L”).
 111          */
 112
 113         if (gpio_is_valid(priv->reset_gpio))
 114                 gpio_set_value(priv->reset_gpio, 1);
 115
 116         return 0;
 117 }
 118
 119 static int ak5386_hw_free(struct snd_pcm_substream *substream,
 120                           struct snd_soc_dai *dai)
 121 {
 122         struct snd_soc_component *component = dai->component;
 123         struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
 124
 125         if (gpio_is_valid(priv->reset_gpio))
 126                 gpio_set_value(priv->reset_gpio, 0);
 127
 128         return 0;
 129 }
 130
 131 static const struct snd_soc_dai_ops ak5386_dai_ops = {
 132         .set_fmt        = ak5386_set_dai_fmt,
 133         .hw_params      = ak5386_hw_params,
 134         .hw_free        = ak5386_hw_free,
 135 };
 136
 137 static struct snd_soc_dai_driver ak5386_dai = {
 138         .name           = "ak5386-hifi",
 139         .capture        = {
 140                 .stream_name    = "Capture",
 141                 .channels_min   = 1,
 142                 .channels_max   = 2,
 143                 .rates          = SNDRV_PCM_RATE_8000_192000,
 144                 .formats        = SNDRV_PCM_FMTBIT_S8     |
 145                                   SNDRV_PCM_FMTBIT_S16_LE |
 146                                   SNDRV_PCM_FMTBIT_S24_LE |
 147                                   SNDRV_PCM_FMTBIT_S24_3LE,
 148         },
 149         .ops    = &ak5386_dai_ops,
 150 };
 151
 152 #ifdef CONFIG_OF
 153 static const struct of_device_id ak5386_dt_ids[] = {
 154         { .compatible = "asahi-kasei,ak5386", },
 155         { }
 156 };
 157 MODULE_DEVICE_TABLE(of, ak5386_dt_ids);
 158 #endif
 159
 160 static int ak5386_probe(struct platform_device *pdev)
 161 {
 162         struct device *dev = &pdev->dev;
 163         struct ak5386_priv *priv;
 164         int ret, i;
 165
 166         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 167         if (!priv)
 168                 return -ENOMEM;
 169
 170         dev_set_drvdata(dev, priv);
 171
 172         for (i = 0; i < ARRAY_SIZE(supply_names); i++)
 173                 priv->supplies[i].supply = supply_names[i];
 174
 175         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
 176                                       priv->supplies);
 177         if (ret < 0)
 178                 return ret;
 179
 180         priv->reset_gpio = of_get_named_gpio(dev->of_node,
 181                                              "reset-gpio", 0);
 182
 183         if (gpio_is_valid(priv->reset_gpio))
 184                 if (devm_gpio_request_one(dev, priv->reset_gpio,
 185                                           GPIOF_OUT_INIT_LOW,
 186                                           "AK5386 Reset"))
 187                         priv->reset_gpio = -EINVAL;
 188
 189         return devm_snd_soc_register_component(dev, &soc_component_ak5386,
 190                                       &ak5386_dai, 1);
 191 }
 192
 193 static struct platform_driver ak5386_driver = {
 194         .probe          = ak5386_probe,
 195         .driver         = {
 196                 .name   = "ak5386",
 197                 .of_match_table = of_match_ptr(ak5386_dt_ids),
 198         },
 199 };
 200
 201 module_platform_driver(ak5386_driver);
 202
 203 MODULE_DESCRIPTION("ASoC driver for AK5386 ADC");
 204 MODULE_AUTHOR("Daniel Mack <zonque@gmail.com>");
 205 MODULE_LICENSE("GPL");