sound/soc/atmel/mikroe-proto.c

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

File Facts

System
Linux kernel
Corpus path
sound/soc/atmel/mikroe-proto.c
Extension
.c
Size
4395 bytes
Lines
177
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-only
/*
 * ASoC driver for PROTO AudioCODEC (with a WM8731)
 *
 * Author:      Florian Meier, <koalo@koalo.de>
 *	      Copyright 2013
 */

#include <linux/module.h>
#include <linux/platform_device.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/jack.h>

#include "../codecs/wm8731.h"

#define XTAL_RATE 12288000	/* This is fixed on this board */

static int snd_proto_init(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_soc_card *card = rtd->card;
	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);

	/* Set proto sysclk */
	int ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
					 XTAL_RATE, SND_SOC_CLOCK_IN);
	if (ret < 0) {
		dev_err(card->dev, "Failed to set WM8731 SYSCLK: %d\n",
			ret);
		return ret;
	}

	return 0;
}

static const struct snd_soc_dapm_widget snd_proto_widget[] = {
	SND_SOC_DAPM_MIC("Microphone Jack", NULL),
	SND_SOC_DAPM_HP("Headphone Jack", NULL),
};

static const struct snd_soc_dapm_route snd_proto_route[] = {
	/* speaker connected to LHPOUT/RHPOUT */
	{"Headphone Jack", NULL, "LHPOUT"},
	{"Headphone Jack", NULL, "RHPOUT"},

	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
	{"MICIN", NULL, "Mic Bias"},
	{"Mic Bias", NULL, "Microphone Jack"},
};

/* audio machine driver */
static struct snd_soc_card snd_proto = {
	.name		= "snd_mikroe_proto",
	.owner		= THIS_MODULE,
	.dapm_widgets	= snd_proto_widget,
	.num_dapm_widgets = ARRAY_SIZE(snd_proto_widget),
	.dapm_routes	= snd_proto_route,
	.num_dapm_routes = ARRAY_SIZE(snd_proto_route),
};

static int snd_proto_probe(struct platform_device *pdev)
{
	struct snd_soc_dai_link *dai;
	struct snd_soc_dai_link_component *comp;
	struct device_node *np = pdev->dev.of_node;
	struct device_node *codec_np, *cpu_np;
	struct device_node *bitclkmaster = NULL;
	struct device_node *framemaster = NULL;
	unsigned int dai_fmt;
	int ret = 0;

	if (!np) {
		dev_err(&pdev->dev, "No device node supplied\n");
		return -EINVAL;
	}

	snd_proto.dev = &pdev->dev;
	ret = snd_soc_of_parse_card_name(&snd_proto, "model");
	if (ret)
		return ret;

	dai = devm_kzalloc(&pdev->dev, sizeof(*dai), GFP_KERNEL);
	if (!dai)
		return -ENOMEM;

	/* for cpus/codecs/platforms */
	comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
	if (!comp)

Annotation

Implementation Notes