sound/soc/atmel/atmel_wm8904.c

Source file repositories/reference/linux-study-clean/sound/soc/atmel/atmel_wm8904.c

File Facts

System
Linux kernel
Corpus path
sound/soc/atmel/atmel_wm8904.c
Extension
.c
Size
5097 bytes
Lines
199
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
/*
 * atmel_wm8904 - Atmel ASoC driver for boards with WM8904 codec.
 *
 * Copyright (C) 2012 Atmel
 *
 * Author: Bo Shen <voice.shen@atmel.com>
 */

#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>

#include <sound/soc.h>

#include "../codecs/wm8904.h"
#include "atmel_ssc_dai.h"

static const struct snd_soc_dapm_widget atmel_asoc_wm8904_dapm_widgets[] = {
	SND_SOC_DAPM_HP("Headphone Jack", NULL),
	SND_SOC_DAPM_MIC("Mic", NULL),
	SND_SOC_DAPM_LINE("Line In Jack", NULL),
};

static int atmel_asoc_wm8904_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);
	int ret;

	ret = snd_soc_dai_set_pll(codec_dai, WM8904_FLL_MCLK, WM8904_FLL_MCLK,
		32768, params_rate(params) * 256);
	if (ret < 0) {
		pr_err("%s - failed to set wm8904 codec PLL.", __func__);
		return ret;
	}

	/*
	 * As here wm8904 use FLL output as its system clock
	 * so calling set_sysclk won't care freq parameter
	 * then we pass 0
	 */
	ret = snd_soc_dai_set_sysclk(codec_dai, WM8904_CLK_FLL,
			0, SND_SOC_CLOCK_IN);
	if (ret < 0) {
		pr_err("%s -failed to set wm8904 SYSCLK\n", __func__);
		return ret;
	}

	return 0;
}

static const struct snd_soc_ops atmel_asoc_wm8904_ops = {
	.hw_params = atmel_asoc_wm8904_hw_params,
};

SND_SOC_DAILINK_DEFS(pcm,
	DAILINK_COMP_ARRAY(COMP_EMPTY()),
	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8904-hifi")),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

static struct snd_soc_dai_link atmel_asoc_wm8904_dailink = {
	.name = "WM8904",
	.stream_name = "WM8904 PCM",
	.dai_fmt = SND_SOC_DAIFMT_I2S
		| SND_SOC_DAIFMT_NB_NF
		| SND_SOC_DAIFMT_CBP_CFP,
	.ops = &atmel_asoc_wm8904_ops,
	SND_SOC_DAILINK_REG(pcm),
};

static struct snd_soc_card atmel_asoc_wm8904_card = {
	.name = "atmel_asoc_wm8904",
	.owner = THIS_MODULE,
	.dai_link = &atmel_asoc_wm8904_dailink,
	.num_links = 1,
	.dapm_widgets = atmel_asoc_wm8904_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(atmel_asoc_wm8904_dapm_widgets),
	.fully_routed = true,
};

static int atmel_asoc_wm8904_dt_init(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct device_node *codec_np, *cpu_np;
	struct snd_soc_card *card = &atmel_asoc_wm8904_card;
	struct snd_soc_dai_link *dailink = &atmel_asoc_wm8904_dailink;
	int ret;

Annotation

Implementation Notes