sound/soc/intel/avs/boards/i2s_test.c

Source file repositories/reference/linux-study-clean/sound/soc/intel/avs/boards/i2s_test.c

File Facts

System
Linux kernel
Corpus path
sound/soc/intel/avs/boards/i2s_test.c
Extension
.c
Size
3324 bytes
Lines
130
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 <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-acpi.h>
#include <sound/soc-dapm.h>
#include "../utils.h"

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);
	if (!dl->name || !dl->cpus)
		return -ENOMEM;

	dl->cpus->dai_name = devm_kasprintf(dev, GFP_KERNEL,
					    AVS_STRING_FMT("SSP", " Pin", ssp_port, tdm_slot));
	dl->codecs = &snd_soc_dummy_dlc;
	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->nonatomic = 1;
	dl->no_pcm = 1;

	*dai_link = dl;

	return 0;
}

static int avs_i2s_test_probe(struct platform_device *pdev)
{
	struct snd_soc_dai_link *dai_link;
	struct snd_soc_acpi_mach *mach;
	struct avs_mach_pdata *pdata;
	struct snd_soc_card *card;
	struct device *dev = &pdev->dev;
	int ssp_port, tdm_slot, ret;

	mach = dev_get_platdata(dev);
	pdata = mach->pdata;

	if (!avs_mach_singular_ssp(mach)) {
		dev_err(dev, "Invalid SSP configuration\n");
		return -EINVAL;
	}
	ssp_port = avs_mach_ssp_port(mach);

	if (!avs_mach_singular_tdm(mach, ssp_port)) {
		dev_err(dev, "Invalid TDM configuration\n");
		return -EINVAL;
	}
	tdm_slot = avs_mach_ssp_tdm(mach, ssp_port);

	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
	if (!card)
		return -ENOMEM;

	if (pdata->obsolete_card_names) {
		card->name = devm_kasprintf(dev, GFP_KERNEL,
					    AVS_STRING_FMT("ssp", "-loopback", ssp_port, tdm_slot));
	} else {
		card->driver_name = "avs_i2s_test";
		card->long_name = card->name = devm_kasprintf(dev, GFP_KERNEL,
							      AVS_STRING_FMT("AVS I2S TEST-", "",
									     ssp_port, tdm_slot));
	}

Annotation

Implementation Notes