sound/soc/mediatek/mt2701/mt2701-wm8960.c

Source file repositories/reference/linux-study-clean/sound/soc/mediatek/mt2701/mt2701-wm8960.c

File Facts

System
Linux kernel
Corpus path
sound/soc/mediatek/mt2701/mt2701-wm8960.c
Extension
.c
Size
4924 bytes
Lines
183
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
/*
 * mt2701-wm8960.c  --  MT2701 WM8960 ALSA SoC machine driver
 *
 * Copyright (c) 2017 MediaTek Inc.
 * Author: Ryder Lee <ryder.lee@mediatek.com>
 */

#include <linux/module.h>
#include <sound/soc.h>

#include "mt2701-afe-common.h"

static const struct snd_soc_dapm_widget mt2701_wm8960_widgets[] = {
	SND_SOC_DAPM_HP("Headphone", NULL),
	SND_SOC_DAPM_MIC("AMIC", NULL),
};

static const struct snd_kcontrol_new mt2701_wm8960_controls[] = {
	SOC_DAPM_PIN_SWITCH("Headphone"),
	SOC_DAPM_PIN_SWITCH("AMIC"),
};

static int mt2701_wm8960_be_ops_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);
	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
	unsigned int mclk_rate;
	unsigned int rate = params_rate(params);
	unsigned int div_mclk_over_bck = rate > 192000 ? 2 : 4;
	unsigned int div_bck_over_lrck = 64;

	mclk_rate = rate * div_bck_over_lrck * div_mclk_over_bck;

	snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_rate, SND_SOC_CLOCK_OUT);
	snd_soc_dai_set_sysclk(codec_dai, 0, mclk_rate, SND_SOC_CLOCK_IN);

	return 0;
}

static const struct snd_soc_ops mt2701_wm8960_be_ops = {
	.hw_params = mt2701_wm8960_be_ops_hw_params
};

SND_SOC_DAILINK_DEFS(playback,
	DAILINK_COMP_ARRAY(COMP_CPU("PCMO0")),
	DAILINK_COMP_ARRAY(COMP_DUMMY()),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

SND_SOC_DAILINK_DEFS(capture,
	DAILINK_COMP_ARRAY(COMP_CPU("PCM0")),
	DAILINK_COMP_ARRAY(COMP_DUMMY()),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

SND_SOC_DAILINK_DEFS(codec,
	DAILINK_COMP_ARRAY(COMP_CPU("I2S0")),
	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8960-hifi")),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

static struct snd_soc_dai_link mt2701_wm8960_dai_links[] = {
	/* FE */
	{
		.name = "wm8960-playback",
		.stream_name = "wm8960-playback",
		.trigger = {SND_SOC_DPCM_TRIGGER_POST,
			    SND_SOC_DPCM_TRIGGER_POST},
		.dynamic = 1,
		.playback_only = 1,
		SND_SOC_DAILINK_REG(playback),
	},
	{
		.name = "wm8960-capture",
		.stream_name = "wm8960-capture",
		.trigger = {SND_SOC_DPCM_TRIGGER_POST,
			    SND_SOC_DPCM_TRIGGER_POST},
		.dynamic = 1,
		.capture_only = 1,
		SND_SOC_DAILINK_REG(capture),
	},
	/* BE */
	{
		.name = "wm8960-codec",
		.no_pcm = 1,
		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBC_CFC
			| SND_SOC_DAIFMT_GATED,
		.ops = &mt2701_wm8960_be_ops,
		SND_SOC_DAILINK_REG(codec),
	},

Annotation

Implementation Notes