sound/soc/codecs/adau7002.c

   1 /*
   2  * ADAU7002 Stereo PDM-to-I2S/TDM converter driver
   3  *
   4  * Copyright 2014-2016 Analog Devices
   5  *  Author: Lars-Peter Clausen <lars@metafoo.de>
   6  *
   7  * Licensed under the GPL-2.
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/delay.h>
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16
  17 #include <sound/soc.h>
  18
  19 struct adau7002_priv {
  20         int wakeup_delay;
  21 };
  22
  23 static int adau7002_aif_event(struct snd_soc_dapm_widget *w,
  24                               struct snd_kcontrol *kcontrol, int event)
  25 {
  26         struct snd_soc_component *component =
  27                         snd_soc_dapm_to_component(w->dapm);
  28         struct adau7002_priv *adau7002 =
  29                         snd_soc_component_get_drvdata(component);
  30
  31         switch (event) {
  32         case SND_SOC_DAPM_POST_PMU:
  33                 if (adau7002->wakeup_delay)
  34                         msleep(adau7002->wakeup_delay);
  35                 break;
  36         }
  37
  38         return 0;
  39 }
  40
  41 static int adau7002_component_probe(struct snd_soc_component *component)
  42 {
  43         struct adau7002_priv *adau7002;
  44
  45         adau7002 = devm_kzalloc(component->dev, sizeof(*adau7002),
  46                                 GFP_KERNEL);
  47         if (!adau7002)
  48                 return -ENOMEM;
  49
  50         device_property_read_u32(component->dev, "wakeup-delay-ms",
  51                                  &adau7002->wakeup_delay);
  52
  53         snd_soc_component_set_drvdata(component, adau7002);
  54
  55         return 0;
  56 }
  57
  58 static const struct snd_soc_dapm_widget adau7002_widgets[] = {
  59         SND_SOC_DAPM_AIF_OUT_E("ADAU AIF", "Capture", 0,
  60                                SND_SOC_NOPM, 0, 0, adau7002_aif_event,
  61                                SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
  62         SND_SOC_DAPM_INPUT("PDM_DAT"),
  63         SND_SOC_DAPM_REGULATOR_SUPPLY("IOVDD", 0, 0),
  64 };
  65
  66 static const struct snd_soc_dapm_route adau7002_routes[] = {
  67         { "ADAU AIF", NULL, "PDM_DAT"},
  68         { "Capture", NULL, "PDM_DAT" },
  69         { "Capture", NULL, "IOVDD" },
  70 };
  71
  72 static struct snd_soc_dai_driver adau7002_dai = {
  73         .name = "adau7002-hifi",
  74         .capture = {
  75                 .stream_name = "Capture",
  76                 .channels_min = 2,
  77                 .channels_max = 2,
  78                 .rates = SNDRV_PCM_RATE_8000_96000,
  79                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S18_3LE |
  80                         SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE |
  81                         SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE,
  82                 .sig_bits = 20,
  83         },
  84 };
  85
  86 static const struct snd_soc_component_driver adau7002_component_driver = {
  87         .probe                  = adau7002_component_probe,
  88         .dapm_widgets           = adau7002_widgets,
  89         .num_dapm_widgets       = ARRAY_SIZE(adau7002_widgets),
  90         .dapm_routes            = adau7002_routes,
  91         .num_dapm_routes        = ARRAY_SIZE(adau7002_routes),
  92         .idle_bias_on           = 1,
  93         .use_pmdown_time        = 1,
  94         .endianness             = 1,
  95         .non_legacy_dai_naming  = 1,
  96 };
  97
  98 static int adau7002_probe(struct platform_device *pdev)
  99 {
 100         return devm_snd_soc_register_component(&pdev->dev,
 101                         &adau7002_component_driver,
 102                         &adau7002_dai, 1);
 103 }
 104
 105 static int adau7002_remove(struct platform_device *pdev)
 106 {
 107         return 0;
 108 }
 109
 110 #ifdef CONFIG_OF
 111 static const struct of_device_id adau7002_dt_ids[] = {
 112         { .compatible = "adi,adau7002", },
 113         { }
 114 };
 115 MODULE_DEVICE_TABLE(of, adau7002_dt_ids);
 116 #endif
 117
 118 #ifdef CONFIG_ACPI
 119 static const struct acpi_device_id adau7002_acpi_match[] = {
 120         { "ADAU7002", 0 },
 121         {},
 122 };
 123 MODULE_DEVICE_TABLE(acpi, adau7002_acpi_match);
 124 #endif
 125
 126 static struct platform_driver adau7002_driver = {
 127         .driver = {
 128                 .name = "adau7002",
 129                 .of_match_table = of_match_ptr(adau7002_dt_ids),
 130                 .acpi_match_table = ACPI_PTR(adau7002_acpi_match),
 131         },
 132         .probe = adau7002_probe,
 133         .remove = adau7002_remove,
 134 };
 135 module_platform_driver(adau7002_driver);
 136
 137 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 138 MODULE_DESCRIPTION("ADAU7002 Stereo PDM-to-I2S/TDM Converter driver");
 139 MODULE_LICENSE("GPL v2");