sound/soc/intel/avs/boards/max98357a.c

Source file repositories/reference/linux-study-clean/sound/soc/intel/avs/boards/max98357a.c

File Facts

System
Linux kernel
Corpus path
sound/soc/intel/avs/boards/max98357a.c
Extension
.c
Size
4387 bytes
Lines
159
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
//
// Copyright(c) 2021-2022 Intel Corporation
//
// Authors: Cezary Rojewski <cezary.rojewski@intel.com>
//          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
//

#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-acpi.h>
#include <sound/soc-dapm.h>
#include "../utils.h"

static const struct snd_kcontrol_new card_controls[] = {
	SOC_DAPM_PIN_SWITCH("Spk"),
};

static const struct snd_soc_dapm_widget card_widgets[] = {
	SND_SOC_DAPM_SPK("Spk", NULL),
};

static const struct snd_soc_dapm_route card_base_routes[] = {
	{ "Spk", NULL, "Speaker" },
};

static int
avs_max98357a_be_fixup(struct snd_soc_pcm_runtime *runrime, struct snd_pcm_hw_params *params)
{
	struct snd_interval *rate, *channels;
	struct snd_mask *fmt;

	rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
	channels = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
	fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);

	/* The ADSP will convert the FE rate to 48k, stereo */
	rate->min = rate->max = 48000;
	channels->min = channels->max = 2;

	/* set SSP0 to 16 bit */
	snd_mask_none(fmt);
	snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
	return 0;
}

static int avs_create_dai_link(struct device *dev, int ssp_port, int tdm_slot,
			       struct snd_soc_dai_link **dai_link)
{
	struct snd_soc_dai_link_component *platform;
	struct snd_soc_dai_link *dl;

	dl = devm_kzalloc(dev, sizeof(*dl), GFP_KERNEL);
	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
	if (!dl || !platform)
		return -ENOMEM;

	dl->name = devm_kasprintf(dev, GFP_KERNEL,
				  AVS_STRING_FMT("SSP", "-Codec", ssp_port, tdm_slot));
	dl->cpus = devm_kzalloc(dev, sizeof(*dl->cpus), GFP_KERNEL);
	dl->codecs = devm_kzalloc(dev, sizeof(*dl->codecs), GFP_KERNEL);
	if (!dl->name || !dl->cpus || !dl->codecs)
		return -ENOMEM;

	dl->cpus->dai_name = devm_kasprintf(dev, GFP_KERNEL,
					    AVS_STRING_FMT("SSP", " Pin", ssp_port, tdm_slot));
	dl->codecs->name = devm_kasprintf(dev, GFP_KERNEL, "MX98357A:00");
	dl->codecs->dai_name = devm_kasprintf(dev, GFP_KERNEL, "HiFi");
	if (!dl->cpus->dai_name || !dl->codecs->name || !dl->codecs->dai_name)
		return -ENOMEM;

	platform->name = dev_name(dev);
	dl->num_cpus = 1;
	dl->num_codecs = 1;
	dl->platforms = platform;
	dl->num_platforms = 1;
	dl->id = 0;
	dl->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBC_CFC;
	dl->be_hw_params_fixup = avs_max98357a_be_fixup;
	dl->nonatomic = 1;
	dl->no_pcm = 1;
	dl->playback_only = 1;

	*dai_link = dl;

	return 0;
}

Annotation

Implementation Notes