sound/soc/codecs/ak5386.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/ak5386.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/ak5386.c
Extension
.c
Size
5469 bytes
Lines
204
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 ak5386_priv {
	struct gpio_desc *reset_gpio;
	struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
};

static const struct snd_soc_dapm_widget ak5386_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("AINL"),
SND_SOC_DAPM_INPUT("AINR"),
};

static const struct snd_soc_dapm_route ak5386_dapm_routes[] = {
	{ "Capture", NULL, "AINL" },
	{ "Capture", NULL, "AINR" },
};

static int ak5386_soc_probe(struct snd_soc_component *component)
{
	struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
}

static void ak5386_soc_remove(struct snd_soc_component *component)
{
	struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
}

#ifdef CONFIG_PM
static int ak5386_soc_suspend(struct snd_soc_component *component)
{
	struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
	regulator_bulk_disable(ARRAY_SIZE(priv->supplies), priv->supplies);
	return 0;
}

static int ak5386_soc_resume(struct snd_soc_component *component)
{
	struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);
	return regulator_bulk_enable(ARRAY_SIZE(priv->supplies), priv->supplies);
}
#else
#define ak5386_soc_suspend	NULL
#define ak5386_soc_resume	NULL
#endif /* CONFIG_PM */

static const struct snd_soc_component_driver soc_component_ak5386 = {
	.probe			= ak5386_soc_probe,
	.remove			= ak5386_soc_remove,
	.suspend		= ak5386_soc_suspend,
	.resume			= ak5386_soc_resume,
	.dapm_widgets		= ak5386_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(ak5386_dapm_widgets),
	.dapm_routes		= ak5386_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(ak5386_dapm_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
};

static int ak5386_set_dai_fmt(struct snd_soc_dai *codec_dai,
			      unsigned int format)
{
	struct snd_soc_component *component = codec_dai->component;

	format &= SND_SOC_DAIFMT_FORMAT_MASK;
	if (format != SND_SOC_DAIFMT_LEFT_J &&
	    format != SND_SOC_DAIFMT_I2S) {
		dev_err(component->dev, "Invalid DAI format\n");
		return -EINVAL;
	}

	return 0;
}

static int ak5386_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *dai)
{
	struct snd_soc_component *component = dai->component;
	struct ak5386_priv *priv = snd_soc_component_get_drvdata(component);

	/*
	 * From the datasheet:
	 *
	 * All external clocks (MCLK, SCLK and LRCK) must be present unless
	 * PDN pin = “L”. If these clocks are not provided, the AK5386 may
	 * draw excess current due to its use of internal dynamically
	 * refreshed logic. If the external clocks are not present, place
	 * the AK5386 in power-down mode (PDN pin = “L”).
	 */

Annotation

Implementation Notes