sound/soc/meson/meson-codec-glue.c

Source file repositories/reference/linux-study-clean/sound/soc/meson/meson-codec-glue.c

File Facts

System
Linux kernel
Corpus path
sound/soc/meson/meson-codec-glue.c
Extension
.c
Size
3866 bytes
Lines
148
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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

// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2019 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>

#include <linux/module.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>

#include "meson-codec-glue.h"

static struct snd_soc_dapm_widget *
meson_codec_glue_get_input(struct snd_soc_dapm_widget *w)
{
	struct snd_soc_dapm_path *p;
	struct snd_soc_dapm_widget *in;

	snd_soc_dapm_widget_for_each_source_path(w, p) {
		if (!p->connect)
			continue;

		/* Check that we still are in the same component */
		if (snd_soc_dapm_to_component(w->dapm) !=
		    snd_soc_dapm_to_component(p->source->dapm))
			continue;

		if (p->source->id == snd_soc_dapm_dai_in)
			return p->source;

		in = meson_codec_glue_get_input(p->source);
		if (in)
			return in;
	}

	return NULL;
}

static void meson_codec_glue_input_set_data(struct snd_soc_dai *dai,
					    struct meson_codec_glue_input *data)
{
	snd_soc_dai_dma_data_set_playback(dai, data);
}

struct meson_codec_glue_input *
meson_codec_glue_input_get_data(struct snd_soc_dai *dai)
{
	return snd_soc_dai_dma_data_get_playback(dai);
}
EXPORT_SYMBOL_GPL(meson_codec_glue_input_get_data);

static struct meson_codec_glue_input *
meson_codec_glue_output_get_input_data(struct snd_soc_dapm_widget *w)
{
	struct snd_soc_dapm_widget *in =
		meson_codec_glue_get_input(w);
	struct snd_soc_dai *dai;

	if (WARN_ON(!in))
		return NULL;

	dai = in->priv;

	return meson_codec_glue_input_get_data(dai);
}

int meson_codec_glue_input_hw_params(struct snd_pcm_substream *substream,
				     struct snd_pcm_hw_params *params,
				     struct snd_soc_dai *dai)
{
	struct meson_codec_glue_input *data =
		meson_codec_glue_input_get_data(dai);

	data->params.rates = snd_pcm_rate_to_rate_bit(params_rate(params));
	data->params.rate_min = params_rate(params);
	data->params.rate_max = params_rate(params);
	data->params.formats = 1ULL << (__force int) params_format(params);
	data->params.channels_min = params_channels(params);
	data->params.channels_max = params_channels(params);
	data->params.sig_bits = dai->driver->playback.sig_bits;

	return 0;
}
EXPORT_SYMBOL_GPL(meson_codec_glue_input_hw_params);

int meson_codec_glue_input_set_fmt(struct snd_soc_dai *dai,
				   unsigned int fmt)
{
	struct meson_codec_glue_input *data =
		meson_codec_glue_input_get_data(dai);

Annotation

Implementation Notes