Quelle  wm8782.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * sound/soc/codecs/wm8782.c
 * simple, strap-pin configured 24bit 2ch ADC
 *
 * Copyright: 2011 Raumfeld GmbH
 * Author: Johannes Stezenbach <js@sig21.net>
 *
 * based on ad73311.c
 * Copyright: Analog Devices Inc.
 * Author: Cliff Cai <cliff.cai@analog.com>
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/regulator/consumer.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>

/* regulator power supply names */
static const char *supply_names[] = {
 "Vdda", /* analog supply, 2.7V - 3.6V */
 "Vdd",  /* digital supply, 2.7V - 5.5V */
};

struct wm8782_priv {
 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
 int max_rate;
};

static int wm8782_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
{
 struct snd_pcm_runtime *runtime = sub->runtime;
 struct wm8782_priv *priv =
  snd_soc_component_get_drvdata(dai->component);

 return snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
        8000, priv->max_rate);
}

static const struct snd_soc_dapm_widget wm8782_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("AINL"),
SND_SOC_DAPM_INPUT("AINR"),
};

static const struct snd_soc_dapm_route wm8782_dapm_routes[] = {
 { "Capture", NULL, "AINL" },
 { "Capture", NULL, "AINR" },
};

static const struct snd_soc_dai_ops wm8782_dai_ops = {
 .startup = &wm8782_dai_startup,
};

static struct snd_soc_dai_driver wm8782_dai = {
 .name = "wm8782",
 .capture = {
  .stream_name = "Capture",
  .channels_min = 2,
  .channels_max = 2,
  .rates = SNDRV_PCM_RATE_8000_192000,
  .formats = SNDRV_PCM_FMTBIT_S16_LE |
      SNDRV_PCM_FMTBIT_S20_3LE |
      SNDRV_PCM_FMTBIT_S24_LE,
 },
 .ops = &wm8782_dai_ops,
};

static int wm8782_soc_probe(struct snd_soc_component *component)
{
 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
}

static void wm8782_soc_remove(struct snd_soc_component *component)
{
 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
}

#ifdef CONFIG_PM
static int wm8782_soc_suspend(struct snd_soc_component *component)
{
 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
 regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
 return 0;
}

static int wm8782_soc_resume(struct snd_soc_component *component)
{
 struct wm8782_priv *priv = snd_soc_component_get_drvdata(component);
 return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
}
#else
#define wm8782_soc_suspend      NULL
#define wm8782_soc_resume       NULL
#endif /* CONFIG_PM */

static const struct snd_soc_component_driver soc_component_dev_wm8782 = {
 .probe   = wm8782_soc_probe,
 .remove   = wm8782_soc_remove,
 .suspend  = wm8782_soc_suspend,
 .resume   = wm8782_soc_resume,
 .dapm_widgets  = wm8782_dapm_widgets,
 .num_dapm_widgets = ARRAY_SIZE(wm8782_dapm_widgets),
 .dapm_routes  = wm8782_dapm_routes,
 .num_dapm_routes = ARRAY_SIZE(wm8782_dapm_routes),
 .idle_bias_on  = 1,
 .use_pmdown_time = 1,
 .endianness  = 1,
};

static int wm8782_probe(struct platform_device *pdev)
{
 struct device *dev = &pdev->dev;
 struct device_node *np = dev->of_node;
 struct wm8782_priv *priv;
 int ret, i, fsampen;

 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 if (!priv)
  return -ENOMEM;

 dev_set_drvdata(dev, priv);

 for (i = 0; i < ARRAY_SIZE(supply_names); i++)
  priv->supplies[i].supply = supply_names[i];

 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(priv->supplies),
          priv->supplies);
 if (ret < 0)
  return ret;

 // Assume lowest value by default to avoid inadvertent overclocking
 fsampen = 0;

 if (np)
  of_property_read_u32(np, "wlf,fsampen", &fsampen);

 switch (fsampen) {
 case 0:
  priv->max_rate = 48000;
  break;
 case 1:
  priv->max_rate = 96000;
  break;
 case 2:
  priv->max_rate = 192000;
  break;
 default:
  dev_err(dev, "Invalid wlf,fsampen value");
  return -EINVAL;
 }

 return devm_snd_soc_register_component(&pdev->dev,
   &soc_component_dev_wm8782, &wm8782_dai, 1);
}

#ifdef CONFIG_OF
static const struct of_device_id wm8782_of_match[] = {
 { .compatible = "wlf,wm8782", },
 { }
};
MODULE_DEVICE_TABLE(of, wm8782_of_match);
#endif

static struct platform_driver wm8782_codec_driver = {
 .driver = {
  .name = "wm8782",
  .of_match_table = of_match_ptr(wm8782_of_match),
 },
 .probe = wm8782_probe,
};

module_platform_driver(wm8782_codec_driver);

MODULE_DESCRIPTION("ASoC WM8782 driver");
MODULE_AUTHOR("Johannes Stezenbach ");
MODULE_LICENSE("GPL");