sound/soc/codecs/wm8782.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * sound/soc/codecs/wm8782.c
   4  * simple, strap-pin configured 24bit 2ch ADC
   5  *
   6  * Copyright: 2011 Raumfeld GmbH
   7  * Author: Johannes Stezenbach <js@sig21.net>
   8  *
   9  * based on ad73311.c
  10  * Copyright:   Analog Devices Inc.
  11  * Author:      Cliff Cai <cliff.cai@analog.com>
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/device.h>
  19 #include <linux/regulator/consumer.h>
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/ac97_codec.h>
  23 #include <sound/initval.h>
  24 #include <sound/soc.h>
  25
  26 /* regulator power supply names */
  27 static const char *supply_names[] = {
  28         "Vdda", /* analog supply, 2.7V - 3.6V */
  29         "Vdd",  /* digital supply, 2.7V - 5.5V */
  30 };
  31
  32 struct wm8782_priv {
  33         struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
  34         int max_rate;
  35 };
  36
  37 static int wm8782_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
  38 {
  39         struct snd_pcm_runtime *runtime = sub->runtime;
  40         struct wm8782_priv *priv =
  41                 snd_soc_component_get_drvdata(dai->component);
  42
  43         return snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
  44                                            8000, priv->max_rate);
  45 }
  46
  47 static const struct snd_soc_dapm_widget wm8782_dapm_widgets[] = {
  48 SND_SOC_DAPM_INPUT("AINL"),
  49 SND_SOC_DAPM_INPUT("AINR"),
  50 };
  51
  52 static const struct snd_soc_dapm_route wm8782_dapm_routes[] = {
  53         { "Capture", NULL, "AINL" },
  54         { "Capture", NULL, "AINR" },
  55 };
  56
  57 static const struct snd_soc_dai_ops wm8782_dai_ops = {
  58         .startup = &wm8782_dai_startup,
  59 };
  60
  61 static struct snd_soc_dai_driver wm8782_dai = {
  62         .name = "wm8782",
  63         .capture = {
  64                 .stream_name = "Capture",
  65                 .channels_min = 2,
  66                 .channels_max = 2,
  67                 .rates = SNDRV_PCM_RATE_8000_192000,
  68                 .formats = SNDRV_PCM_FMTBIT_S16_LE |
  69                            SNDRV_PCM_FMTBIT_S20_3LE |
  70                            SNDRV_PCM_FMTBIT_S24_LE,
  71         },
  72         .ops = &wm8782_dai_ops,
  73 };
  74
  75 static int wm8782_soc_probe(struct snd_soc_component *component)
  76 {
  77         struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
  78         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  79 }
  80
  81 static void wm8782_soc_remove(struct snd_soc_component *component)
  82 {
  83         struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
  84         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  85 }
  86
  87 #ifdef CONFIG_PM
  88 static int wm8782_soc_suspend(struct snd_soc_component *component)
  89 {
  90         struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
  91         regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
  92         return 0;
  93 }
  94
  95 static int wm8782_soc_resume(struct snd_soc_component *component)
  96 {
  97         struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
  98         return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
  99 }
 100 #else
 101 #define wm8782_soc_suspend      NULL
 102 #define wm8782_soc_resume       NULL
 103 #endif /* CONFIG_PM */
 104
 105 static const struct snd_soc_component_driver soc_component_dev_wm8782 = {
 106         .probe                  = wm8782_soc_probe,
 107         .remove                 = wm8782_soc_remove,
 108         .suspend                = wm8782_soc_suspend,
 109         .resume                 = wm8782_soc_resume,
 110         .dapm_widgets           = wm8782_dapm_widgets,
 111         .num_dapm_widgets       = ARRAY_SIZE(wm8782_dapm_widgets),
 112         .dapm_routes            = wm8782_dapm_routes,
 113         .num_dapm_routes        = ARRAY_SIZE(wm8782_dapm_routes),
 114         .idle_bias_on           = 1,
 115         .use_pmdown_time        = 1,
 116         .endianness             = 1,
 117 };
 118
 119 static int wm8782_probe(struct platform_device *pdev)
 120 {
 121         struct device *dev = &pdev->dev;
 122         struct device_node *np = dev->of_node;
 123         struct wm8782_priv *priv;
 124         int ret, i, fsampen;
 125
 126         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 127         if (!priv)
 128                 return -ENOMEM;
 129
 130         dev_set_drvdata(dev, priv);
 131
 132         for (i = 0; i < ARRAY_SIZE(supply_names); i++)
 133                 priv->supplies[i].supply = supply_names[i];
 134
 135         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
 136                                       priv->supplies);
 137         if (ret < 0)
 138                 return ret;
 139
 140         // Assume lowest value by default to avoid inadvertent overclocking
 141         fsampen = 0;
 142
 143         if (np)
 144                 of_property_read_u32(np, "wlf,fsampen", &fsampen);
 145
 146         switch (fsampen) {
 147         case 0:
 148                 priv->max_rate = 48000;
 149                 break;
 150         case 1:
 151                 priv->max_rate = 96000;
 152                 break;
 153         case 2:
 154                 priv->max_rate = 192000;
 155                 break;
 156         default:
 157                 dev_err(dev, "Invalid wlf,fsampen value");
 158                 return -EINVAL;
 159         }
 160
 161         return devm_snd_soc_register_component(&pdev->dev,
 162                         &soc_component_dev_wm8782, &wm8782_dai, 1);
 163 }
 164
 165 #ifdef CONFIG_OF
 166 static const struct of_device_id wm8782_of_match[] = {
 167         { .compatible = "wlf,wm8782", },
 168         { }
 169 };
 170 MODULE_DEVICE_TABLE(of, wm8782_of_match);
 171 #endif
 172
 173 static struct platform_driver wm8782_codec_driver = {
 174         .driver = {
 175                 .name = "wm8782",
 176                 .of_match_table = of_match_ptr(wm8782_of_match),
 177         },
 178         .probe = wm8782_probe,
 179 };
 180
 181 module_platform_driver(wm8782_codec_driver);
 182
 183 MODULE_DESCRIPTION("ASoC WM8782 driver");
 184 MODULE_AUTHOR("Johannes Stezenbach <js@sig21.net>");
 185 MODULE_LICENSE("GPL");