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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/sound/soc/intel/avs/boards/dmic.c
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// SPDX-License-Identifier: GPL-2.0-only

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//

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// Copyright(c) 2021-2022 Intel Corporation

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//

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// Authors: Cezary Rojewski <[email protected]>

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//          Amadeusz Slawinski <[email protected]>

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//

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#include <linux/device.h>

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#include <linux/module.h>

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#include <sound/soc.h>

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#include <sound/soc-acpi.h>

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#include "../utils.h"

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SND_SOC_DAILINK_DEF(dmic_pin, DAILINK_COMP_ARRAY(COMP_CPU("DMIC Pin")));

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SND_SOC_DAILINK_DEF(dmic_wov_pin, DAILINK_COMP_ARRAY(COMP_CPU("DMIC WoV Pin")));

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static const struct snd_soc_dapm_widget card_widgets[] = {

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	SND_SOC_DAPM_MIC("SoC DMIC", NULL),

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};

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static const struct snd_soc_dapm_route card_routes[] = {

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	{"DMic", NULL, "SoC DMIC"},

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};

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static int avs_create_dai_links(struct device *dev, const char *codec_name,

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				struct snd_soc_dai_link **links, int *num_links)

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{

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	struct snd_soc_dai_link_component *platform;

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	struct snd_soc_dai_link *dl;

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	const int num_dl = 2;

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	dl = devm_kcalloc(dev, num_dl, sizeof(*dl), GFP_KERNEL);

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	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);

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	if (!dl || !platform)

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		return -ENOMEM;

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	dl->codecs = devm_kzalloc(dev, sizeof(*dl->codecs), GFP_KERNEL);

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	if (!dl->codecs)

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		return -ENOMEM;

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	dl->codecs->name = devm_kstrdup(dev, codec_name, GFP_KERNEL);

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	dl->codecs->dai_name = devm_kasprintf(dev, GFP_KERNEL, "dmic-hifi");

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	if (!dl->codecs->name || !dl->codecs->dai_name)

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		return -ENOMEM;

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	platform->name = dev_name(dev);

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	dl[0].num_cpus = 1;

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	dl[0].num_codecs = 1;

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	dl[0].platforms = platform;

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	dl[0].num_platforms = 1;

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	dl[0].nonatomic = 1;

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	dl[0].no_pcm = 1;

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	dl[0].capture_only = 1;

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	memcpy(&dl[1], &dl[0], sizeof(*dl));

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	dl[0].name = "DMIC";

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	dl[0].cpus = dmic_pin;

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	dl[0].id = 0;

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	dl[1].name = "DMIC WoV";

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	dl[1].cpus = dmic_wov_pin;

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	dl[1].id = 1;

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	dl[1].ignore_suspend = 1;

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	*links = dl;

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	*num_links = num_dl;

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	return 0;

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}

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static int avs_dmic_probe(struct platform_device *pdev)

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{

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	struct device *dev = &pdev->dev;

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	struct snd_soc_acpi_mach *mach;

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	struct avs_mach_pdata *pdata;

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	struct snd_soc_card *card;

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	int ret;

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	mach = dev_get_platdata(dev);

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	pdata = mach->pdata;

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	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);

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	if (!card)

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		return -ENOMEM;

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	ret = avs_create_dai_links(dev, pdata->codec_name, &card->dai_link, &card->num_links);

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	if (ret)

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		return ret;

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	if (pdata->obsolete_card_names) {

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		card->name = "avs_dmic";

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	} else {

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		card->driver_name = "avs_dmic";

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		card->long_name = card->name = "AVS DMIC";

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	}

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	card->dev = dev;

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	card->owner = THIS_MODULE;

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	card->dapm_widgets = card_widgets;

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	card->num_dapm_widgets = ARRAY_SIZE(card_widgets);

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	card->dapm_routes = card_routes;

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	card->num_dapm_routes = ARRAY_SIZE(card_routes);

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	card->fully_routed = true;

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	return devm_snd_soc_register_deferrable_card(dev, card);

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}

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static const struct platform_device_id avs_dmic_driver_ids[] = {

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	{

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		.name = "avs_dmic",

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	},

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	{},

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};

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MODULE_DEVICE_TABLE(platform, avs_dmic_driver_ids);

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static struct platform_driver avs_dmic_driver = {

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	.probe = avs_dmic_probe,

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	.driver = {

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		.name = "avs_dmic",

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		.pm = &snd_soc_pm_ops,

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	},

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	.id_table = avs_dmic_driver_ids,

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};

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module_platform_driver(avs_dmic_driver);

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MODULE_DESCRIPTION("Intel DMIC machine driver");

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MODULE_LICENSE("GPL");

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