sound/soc/codecs/wm8782.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/wm8782.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/wm8782.c
Extension
.c
Size
4784 bytes
Lines
186
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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;

Annotation

Implementation Notes