sound/soc/codecs/rt9123p.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/rt9123p.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/rt9123p.c
Extension
.c
Size
4639 bytes
Lines
172
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 rt9123p_priv {
	struct gpio_desc *enable;
	unsigned int enable_delay;
	int enable_switch;
};

static int rt9123p_daiops_trigger(struct snd_pcm_substream *substream, int cmd,
				  struct snd_soc_dai *dai)
{
	struct snd_soc_component *comp = dai->component;
	struct rt9123p_priv *rt9123p = snd_soc_component_get_drvdata(comp);

	if (!rt9123p->enable)
		return 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		mdelay(rt9123p->enable_delay);
		if (rt9123p->enable_switch) {
			gpiod_set_value(rt9123p->enable, 1);
			dev_dbg(comp->dev, "set enable to 1");
		}
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		gpiod_set_value(rt9123p->enable, 0);
		dev_dbg(comp->dev, "set enable to 0");
		break;
	default:
		break;
	}

	return 0;
}

static int rt9123p_enable_event(struct snd_soc_dapm_widget *w, struct snd_kcontrol *kcontrol,
				int event)
{
	struct snd_soc_component *comp = snd_soc_dapm_to_component(w->dapm);
	struct rt9123p_priv *rt9123p = snd_soc_component_get_drvdata(comp);

	if (event & SND_SOC_DAPM_POST_PMU)
		rt9123p->enable_switch = 1;
	else if (event & SND_SOC_DAPM_POST_PMD)
		rt9123p->enable_switch = 0;

	return 0;
}

static const struct snd_soc_dapm_widget rt9123p_dapm_widgets[] = {
	SND_SOC_DAPM_OUTPUT("SPK"),
	SND_SOC_DAPM_OUT_DRV_E("Amp Drv", SND_SOC_NOPM, 0, 0, NULL, 0, rt9123p_enable_event,
			       SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
};

static const struct snd_soc_dapm_route rt9123p_dapm_routes[] = {
	{"Amp Drv", NULL, "HiFi Playback"},
	{"SPK", NULL, "Amp Drv"},
};

static const struct snd_soc_component_driver rt9123p_comp_driver = {
	.dapm_widgets		= rt9123p_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(rt9123p_dapm_widgets),
	.dapm_routes		= rt9123p_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(rt9123p_dapm_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
};

static const struct snd_soc_dai_ops rt9123p_dai_ops = {
	.trigger        = rt9123p_daiops_trigger,
};

static struct snd_soc_dai_driver rt9123p_dai_driver = {
	.name = "HiFi",
	.playback = {
		.stream_name	= "HiFi Playback",
		.formats	= SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_S24 |
				  SNDRV_PCM_FMTBIT_S32,
		.rates		= SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
				  SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_24000 |
				  SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
				  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
				  SNDRV_PCM_RATE_96000,
		.rate_min	= 8000,
		.rate_max	= 96000,

Annotation

Implementation Notes