sound/soc/codecs/pcm3008.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/pcm3008.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/pcm3008.c
Extension
.c
Size
4367 bytes
Lines
167
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 pcm3008 {
	struct gpio_desc *dem0_pin;
	struct gpio_desc *dem1_pin;
	struct gpio_desc *pdad_pin;
	struct gpio_desc *pdda_pin;
};

static int pcm3008_dac_ev(struct snd_soc_dapm_widget *w,
			  struct snd_kcontrol *kcontrol,
			  int event)
{
	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
	struct pcm3008 *pcm = component->dev->platform_data;

	gpiod_set_value_cansleep(pcm->pdda_pin,
				 SND_SOC_DAPM_EVENT_ON(event));

	return 0;
}

static int pcm3008_adc_ev(struct snd_soc_dapm_widget *w,
			  struct snd_kcontrol *kcontrol,
			  int event)
{
	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
	struct pcm3008 *pcm = component->dev->platform_data;

	gpiod_set_value_cansleep(pcm->pdad_pin,
				 SND_SOC_DAPM_EVENT_ON(event));

	return 0;
}

static const struct snd_soc_dapm_widget pcm3008_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("VINL"),
SND_SOC_DAPM_INPUT("VINR"),

SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_dac_ev,
		   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_ADC_E("ADC", NULL, SND_SOC_NOPM, 0, 0, pcm3008_adc_ev,
		   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),

SND_SOC_DAPM_OUTPUT("VOUTL"),
SND_SOC_DAPM_OUTPUT("VOUTR"),
};

static const struct snd_soc_dapm_route pcm3008_dapm_routes[] = {
	{ "PCM3008 Capture", NULL, "ADC" },
	{ "ADC", NULL, "VINL" },
	{ "ADC", NULL, "VINR" },

	{ "DAC", NULL, "PCM3008 Playback" },
	{ "VOUTL", NULL, "DAC" },
	{ "VOUTR", NULL, "DAC" },
};

#define PCM3008_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |	\
		       SNDRV_PCM_RATE_48000)

static struct snd_soc_dai_driver pcm3008_dai = {
	.name = "pcm3008-hifi",
	.playback = {
		.stream_name = "PCM3008 Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = PCM3008_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.stream_name = "PCM3008 Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = PCM3008_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
};

static const struct snd_soc_component_driver soc_component_dev_pcm3008 = {
	.dapm_widgets		= pcm3008_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(pcm3008_dapm_widgets),
	.dapm_routes		= pcm3008_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(pcm3008_dapm_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
};

static int pcm3008_codec_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;

Annotation

Implementation Notes