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