sound/soc/mediatek/mt8173/mt8173-rt5650.c

Source file repositories/reference/linux-study-clean/sound/soc/mediatek/mt8173/mt8173-rt5650.c

File Facts

System
Linux kernel
Corpus path
sound/soc/mediatek/mt8173/mt8173-rt5650.c
Extension
.c
Size
9899 bytes
Lines
363
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 mt8173_rt5650_platform_data {
	enum mt8173_rt5650_mclk pll_from;
	/* 0 = external oscillator; 1 = internal source from mt8173 */
};

static struct mt8173_rt5650_platform_data mt8173_rt5650_priv = {
	.pll_from = MT8173_RT5650_MCLK_EXTERNAL,
};

static const struct snd_soc_dapm_widget mt8173_rt5650_widgets[] = {
	SND_SOC_DAPM_SPK("Ext Spk", NULL),
	SND_SOC_DAPM_MIC("Int Mic", NULL),
	SND_SOC_DAPM_HP("Headphone", NULL),
	SND_SOC_DAPM_MIC("Headset Mic", NULL),
};

static const struct snd_soc_dapm_route mt8173_rt5650_routes[] = {
	{"Ext Spk", NULL, "SPOL"},
	{"Ext Spk", NULL, "SPOR"},
	{"DMIC L1", NULL, "Int Mic"},
	{"DMIC R1", NULL, "Int Mic"},
	{"Headphone", NULL, "HPOL"},
	{"Headphone", NULL, "HPOR"},
	{"IN1P", NULL, "Headset Mic"},
	{"IN1N", NULL, "Headset Mic"},
};

static const struct snd_kcontrol_new mt8173_rt5650_controls[] = {
	SOC_DAPM_PIN_SWITCH("Ext Spk"),
	SOC_DAPM_PIN_SWITCH("Int Mic"),
	SOC_DAPM_PIN_SWITCH("Headphone"),
	SOC_DAPM_PIN_SWITCH("Headset Mic"),
};

static struct snd_soc_jack_pin mt8173_rt5650_jack_pins[] = {
	{
		.pin	= "Headphone",
		.mask	= SND_JACK_HEADPHONE,
	},
	{
		.pin	= "Headset Mic",
		.mask	= SND_JACK_MICROPHONE,
	},
};

static int mt8173_rt5650_hw_params(struct snd_pcm_substream *substream,
				   struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	unsigned int mclk_clock;
	struct snd_soc_dai *codec_dai;
	int i, ret;

	switch (mt8173_rt5650_priv.pll_from) {
	case MT8173_RT5650_MCLK_EXTERNAL:
		/* mclk = 12.288M */
		mclk_clock = MCLK_FOR_CODECS;
		break;
	case MT8173_RT5650_MCLK_INTERNAL:
		/* mclk = sampling rate*256 */
		mclk_clock = params_rate(params) * 256;
		break;
	default:
		/* mclk = 12.288M */
		mclk_clock = MCLK_FOR_CODECS;
		break;
	}

	for_each_rtd_codec_dais(rtd, i, codec_dai) {
		/* pll from mclk */
		ret = snd_soc_dai_set_pll(codec_dai, 0, 0, mclk_clock,
					  params_rate(params) * 512);
		if (ret)
			return ret;

		/* sysclk from pll */
		ret = snd_soc_dai_set_sysclk(codec_dai, 1,
					     params_rate(params) * 512,
					     SND_SOC_CLOCK_IN);
		if (ret)
			return ret;
	}
	return 0;
}

static const struct snd_soc_ops mt8173_rt5650_ops = {
	.hw_params = mt8173_rt5650_hw_params,
};

static struct snd_soc_jack mt8173_rt5650_jack, mt8173_rt5650_hdmi_jack;

Annotation

Implementation Notes