sound/soc/samsung/tobermory.c

Source file repositories/reference/linux-study-clean/sound/soc/samsung/tobermory.c

File Facts

System
Linux kernel
Corpus path
sound/soc/samsung/tobermory.c
Extension
.c
Size
5816 bytes
Lines
249
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

if (snd_soc_dapm_get_bias_level(dapm) == SND_SOC_BIAS_STANDBY) {
			ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
						  WM8962_FLL_MCLK, 32768,
						  sample_rate * 512);
			if (ret < 0)
				pr_err("Failed to start FLL: %d\n", ret);

			ret = snd_soc_dai_set_sysclk(codec_dai,
						     WM8962_SYSCLK_FLL,
						     sample_rate * 512,
						     SND_SOC_CLOCK_IN);
			if (ret < 0) {
				pr_err("Failed to set SYSCLK: %d\n", ret);
				snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
						    0, 0, 0);
				return ret;
			}
		}
		break;

	default:
		break;
	}

	return 0;
}

static int tobermory_set_bias_level_post(struct snd_soc_card *card,
					       struct snd_soc_dapm_context *dapm,
					       enum snd_soc_bias_level level)
{
	struct snd_soc_pcm_runtime *rtd;
	struct snd_soc_dai *codec_dai;
	int ret;

	rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]);
	codec_dai = snd_soc_rtd_to_codec(rtd, 0);

	if (snd_soc_dapm_to_dev(dapm) != codec_dai->dev)
		return 0;

	switch (level) {
	case SND_SOC_BIAS_STANDBY:
		ret = snd_soc_dai_set_sysclk(codec_dai, WM8962_SYSCLK_MCLK,
					     32768, SND_SOC_CLOCK_IN);
		if (ret < 0) {
			pr_err("Failed to switch away from FLL: %d\n", ret);
			return ret;
		}

		ret = snd_soc_dai_set_pll(codec_dai, WM8962_FLL,
					  0, 0, 0);
		if (ret < 0) {
			pr_err("Failed to stop FLL: %d\n", ret);
			return ret;
		}
		break;

	default:
		break;
	}

	return 0;
}

static int tobermory_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params)
{
	sample_rate = params_rate(params);

	return 0;
}

static const struct snd_soc_ops tobermory_ops = {
	.hw_params = tobermory_hw_params,
};

SND_SOC_DAILINK_DEFS(cpu,
	DAILINK_COMP_ARRAY(COMP_CPU("samsung-i2s.0")),
	DAILINK_COMP_ARRAY(COMP_CODEC("wm8962.1-001a", "wm8962")),
	DAILINK_COMP_ARRAY(COMP_PLATFORM("samsung-i2s.0")));

static struct snd_soc_dai_link tobermory_dai[] = {
	{
		.name = "CPU",
		.stream_name = "CPU",
		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
				| SND_SOC_DAIFMT_CBP_CFP,
		.ops = &tobermory_ops,
		SND_SOC_DAILINK_REG(cpu),

Annotation

Implementation Notes