sound/soc/tegra/tegra_wm8903.c

Source file repositories/reference/linux-study-clean/sound/soc/tegra/tegra_wm8903.c

File Facts

System
Linux kernel
Corpus path
sound/soc/tegra/tegra_wm8903.c
Extension
.c
Size
5523 bytes
Lines
190
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 (err) {
			dev_err(rtd->dev, "Mic Jack creation failed: %d\n", err);
			return err;
		}

		if (of_property_read_bool(card->dev->of_node, "nvidia,headset"))
			shrt = SND_JACK_MICROPHONE;

		wm8903_mic_detect(component, machine->mic_jack,
				  SND_JACK_MICROPHONE, shrt);
	}

	snd_soc_dapm_force_enable_pin(dapm, "MICBIAS");

	return 0;
}

static int tegra_wm8903_remove(struct snd_soc_card *card)
{
	struct snd_soc_dai_link *link = &card->dai_link[0];
	struct snd_soc_pcm_runtime *rtd = snd_soc_get_pcm_runtime(card, link);
	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
	struct snd_soc_component *component = codec_dai->component;

	wm8903_mic_detect(component, NULL, 0, 0);

	return 0;
}

SND_SOC_DAILINK_DEFS(hifi,
	DAILINK_COMP_ARRAY(COMP_EMPTY()),
	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8903-hifi")),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

static struct snd_soc_dai_link tegra_wm8903_dai = {
	.name = "WM8903",
	.stream_name = "WM8903 PCM",
	.init = tegra_wm8903_init,
	.dai_fmt = SND_SOC_DAIFMT_I2S |
		   SND_SOC_DAIFMT_NB_NF |
		   SND_SOC_DAIFMT_CBC_CFC,
	SND_SOC_DAILINK_REG(hifi),
};

static struct snd_soc_card snd_soc_tegra_wm8903 = {
	.components = "codec:wm8903",
	.owner = THIS_MODULE,
	.dai_link = &tegra_wm8903_dai,
	.num_links = 1,
	.remove = tegra_wm8903_remove,
	.fully_routed = true,
};

/* older device-trees used wrong polarity for the headphones-detection GPIO */
static const struct tegra_asoc_data tegra_wm8903_data_legacy = {
	.mclk_rate = tegra_wm8903_mclk_rate,
	.card = &snd_soc_tegra_wm8903,
	.hp_jack_gpio_active_low = true,
	.add_common_dapm_widgets = true,
	.add_common_controls = true,
	.add_common_snd_ops = true,
	.add_mic_jack = true,
	.add_hp_jack = true,
};

static const struct tegra_asoc_data tegra_wm8903_data = {
	.mclk_rate = tegra_wm8903_mclk_rate,
	.card = &snd_soc_tegra_wm8903,
	.add_common_dapm_widgets = true,
	.add_common_controls = true,
	.add_common_snd_ops = true,
	.add_mic_jack = true,
	.add_hp_jack = true,
};

static const struct of_device_id tegra_wm8903_of_match[] = {
	{ .compatible = "ad,tegra-audio-plutux", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "ad,tegra-audio-wm8903-medcom-wide", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "ad,tegra-audio-wm8903-tec", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "nvidia,tegra-audio-wm8903-cardhu", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "nvidia,tegra-audio-wm8903-harmony", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "nvidia,tegra-audio-wm8903-picasso", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "nvidia,tegra-audio-wm8903-seaboard", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "nvidia,tegra-audio-wm8903-ventana", .data = &tegra_wm8903_data_legacy },
	{ .compatible = "nvidia,tegra-audio-wm8903", .data = &tegra_wm8903_data },
	{},
};
MODULE_DEVICE_TABLE(of, tegra_wm8903_of_match);

static struct platform_driver tegra_wm8903_driver = {

Annotation

Implementation Notes