sound/soc/codecs/pcm1754.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/pcm1754.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/pcm1754.c
Extension
.c
Size
4636 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 pcm1754_priv {
	unsigned int format;
	struct gpio_desc *gpiod_mute;
	struct gpio_desc *gpiod_format;
};

static int pcm1754_set_dai_fmt(struct snd_soc_dai *codec_dai,
				   unsigned int format)
{
	struct snd_soc_component *component = codec_dai->component;
	struct pcm1754_priv *priv = snd_soc_component_get_drvdata(component);

	priv->format = format;

	return 0;
}

static int pcm1754_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *codec_dai)
{
	struct snd_soc_component *component = codec_dai->component;
	struct pcm1754_priv *priv = snd_soc_component_get_drvdata(component);
	int format;

	switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
		switch (params_width(params)) {
		case 16:
			format = 1;
			break;
		default:
			return -EINVAL;
		}
		break;
	case SND_SOC_DAIFMT_I2S:
		switch (params_width(params)) {
		case 16:
			fallthrough;
		case 24:
			format = 0;
			break;
		default:
			return -EINVAL;
		}
		break;
	default:
		dev_err(component->dev, "Invalid DAI format\n");
		return -EINVAL;
	}

	gpiod_set_value_cansleep(priv->gpiod_format, format);

	return 0;
}

static int pcm1754_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
{
	struct pcm1754_priv *priv = snd_soc_component_get_drvdata(dai->component);

	gpiod_set_value_cansleep(priv->gpiod_mute, mute);

	return 0;
}

static const struct snd_soc_dai_ops pcm1754_dai_ops = {
	.set_fmt = pcm1754_set_dai_fmt,
	.hw_params = pcm1754_hw_params,
	.mute_stream = pcm1754_mute_stream,
};

static const struct snd_soc_dai_driver pcm1754_dai = {
	.name = "pcm1754",
	.playback = {
		.stream_name	= "Playback",
		.channels_min	= 2,
		.channels_max	= 2,
		.rates		= SNDRV_PCM_RATE_CONTINUOUS,
		.rate_min	= 5000,
		.rate_max	= 200000,
		.formats	= SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE
	},
	.ops = &pcm1754_dai_ops,
};

static const struct snd_soc_dapm_widget pcm1754_dapm_widgets[] = {
	SND_SOC_DAPM_REGULATOR_SUPPLY("VCC", 0, 0),

	SND_SOC_DAPM_DAC("DAC1", "Channel 1 Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_DAC("DAC2", "Channel 2 Playback", SND_SOC_NOPM, 0, 0),

Annotation

Implementation Notes