sound/soc/codecs/wm1250-ev1.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/wm1250-ev1.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/wm1250-ev1.c
Extension
.c
Size
5628 bytes
Lines
225
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 wm1250_priv {
	struct gpio_desc *clk_ena;
	struct gpio_desc *clk_sel0;
	struct gpio_desc *clk_sel1;
	struct gpio_desc *osr;
	struct gpio_desc *master;
};

static int wm1250_ev1_set_bias_level(struct snd_soc_component *component,
				     enum snd_soc_bias_level level)
{
	struct wm1250_priv *wm1250 = dev_get_drvdata(component->dev);

	switch (level) {
	case SND_SOC_BIAS_ON:
		break;

	case SND_SOC_BIAS_PREPARE:
		break;

	case SND_SOC_BIAS_STANDBY:
		gpiod_set_value_cansleep(wm1250->clk_ena, 1);
		break;

	case SND_SOC_BIAS_OFF:
		gpiod_set_value_cansleep(wm1250->clk_ena, 0);
		break;
	}

	return 0;
}

static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_INPUT("WM1250 Input"),
SND_SOC_DAPM_OUTPUT("WM1250 Output"),
};

static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
	{ "ADC", NULL, "WM1250 Input" },
	{ "WM1250 Output", NULL, "DAC" },
};

static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct wm1250_priv *wm1250 = snd_soc_component_get_drvdata(dai->component);

	switch (params_rate(params)) {
	case 8000:
		gpiod_set_value(wm1250->clk_sel0, 1);
		gpiod_set_value(wm1250->clk_sel1, 1);
		break;
	case 16000:
		gpiod_set_value(wm1250->clk_sel0, 0);
		gpiod_set_value(wm1250->clk_sel1, 1);
		break;
	case 32000:
		gpiod_set_value(wm1250->clk_sel0, 1);
		gpiod_set_value(wm1250->clk_sel1, 0);
		break;
	case 64000:
		gpiod_set_value(wm1250->clk_sel0, 0);
		gpiod_set_value(wm1250->clk_sel1, 0);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct snd_soc_dai_ops wm1250_ev1_ops = {
	.hw_params = wm1250_ev1_hw_params,
};

#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
			  SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)

static struct snd_soc_dai_driver wm1250_ev1_dai = {
	.name = "wm1250-ev1",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM1250_EV1_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,

Annotation

Implementation Notes