root/sound/soc/intel/avs/boards/probe.c
// 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/device.h>
#include <linux/module.h>
#include <sound/soc.h>

static int avs_create_dai_links(struct device *dev, struct snd_soc_dai_link **links, int *num_links)
{
        struct snd_soc_dai_link *dl;

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

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

        dl->name = "Compress Probe Capture";
        dl->cpus->dai_name = "Probe Extraction CPU DAI";
        dl->num_cpus = 1;
        dl->codecs = &snd_soc_dummy_dlc;
        dl->num_codecs = 1;
        dl->platforms->name = dev_name(dev);
        dl->num_platforms = 1;
        dl->nonatomic = 1;

        *links = dl;
        *num_links = 1;
        return 0;
}

static int avs_probe_mb_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct snd_soc_card *card;
        int ret;

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

        ret = avs_create_dai_links(dev, &card->dai_link, &card->num_links);
        if (ret)
                return ret;

        card->driver_name = "avs_probe_mb";
        card->long_name = card->name = "AVS PROBE";
        card->dev = dev;
        card->owner = THIS_MODULE;
        card->fully_routed = true;

        return devm_snd_soc_register_deferrable_card(dev, card);
}

static const struct platform_device_id avs_probe_mb_driver_ids[] = {
        {
                .name = "avs_probe_mb",
        },
        {},
};
MODULE_DEVICE_TABLE(platform, avs_probe_mb_driver_ids);

static struct platform_driver avs_probe_mb_driver = {
        .probe = avs_probe_mb_probe,
        .driver = {
                .name = "avs_probe_mb",
                .pm = &snd_soc_pm_ops,
        },
        .id_table = avs_probe_mb_driver_ids,
};

module_platform_driver(avs_probe_mb_driver);

MODULE_DESCRIPTION("Intel probe machine driver");
MODULE_LICENSE("GPL");