sound/soc/codecs/wm8727.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/wm8727.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/wm8727.c
Extension
.c
Size
1984 bytes
Lines
79
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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * wm8727.c
 *
 *  Created on: 15-Oct-2009
 *      Author: neil.jones@imgtec.com
 *
 * Copyright (C) 2009 Imagination Technologies Ltd.
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>

static const struct snd_soc_dapm_widget wm8727_dapm_widgets[] = {
SND_SOC_DAPM_OUTPUT("VOUTL"),
SND_SOC_DAPM_OUTPUT("VOUTR"),
};

static const struct snd_soc_dapm_route wm8727_dapm_routes[] = {
	{ "VOUTL", NULL, "Playback" },
	{ "VOUTR", NULL, "Playback" },
};

/*
 * Note this is a simple chip with no configuration interface, sample rate is
 * determined automatically by examining the Master clock and Bit clock ratios
 */
#define WM8727_RATES  (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
			SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |\
			SNDRV_PCM_RATE_192000)

static struct snd_soc_dai_driver wm8727_dai = {
	.name = "wm8727-hifi",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = WM8727_RATES,
		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
		},
};

static const struct snd_soc_component_driver soc_component_dev_wm8727 = {
	.dapm_widgets		= wm8727_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(wm8727_dapm_widgets),
	.dapm_routes		= wm8727_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(wm8727_dapm_routes),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
};

static int wm8727_probe(struct platform_device *pdev)
{
	return devm_snd_soc_register_component(&pdev->dev,
			&soc_component_dev_wm8727, &wm8727_dai, 1);
}

static struct platform_driver wm8727_codec_driver = {
	.driver = {
			.name = "wm8727",
	},

	.probe = wm8727_probe,
};

module_platform_driver(wm8727_codec_driver);

MODULE_DESCRIPTION("ASoC wm8727 driver");
MODULE_AUTHOR("Neil Jones");
MODULE_LICENSE("GPL");

Annotation

Implementation Notes