dmic.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2//
  3// Copyright(c) 2021-2022 Intel Corporation
  4//
  5// Authors: Cezary Rojewski <cezary.rojewski@intel.com>
  6//          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
  7//
  8
  9#include <linux/device.h>
 10#include <linux/module.h>
 11#include <sound/soc.h>
 12#include <sound/soc-acpi.h>
 13#include "../utils.h"
 14
 15SND_SOC_DAILINK_DEF(dmic_pin, DAILINK_COMP_ARRAY(COMP_CPU("DMIC Pin")));
 16SND_SOC_DAILINK_DEF(dmic_wov_pin, DAILINK_COMP_ARRAY(COMP_CPU("DMIC WoV Pin")));
 17
 18static const struct snd_soc_dapm_widget card_widgets[] = {
 19	SND_SOC_DAPM_MIC("SoC DMIC", NULL),
 20};
 21
 22static const struct snd_soc_dapm_route card_routes[] = {
 23	{"DMic", NULL, "SoC DMIC"},
 24};
 25
 26static int avs_create_dai_links(struct device *dev, const char *codec_name,
 27				struct snd_soc_dai_link **links, int *num_links)
 28{
 29	struct snd_soc_dai_link_component *platform;
 30	struct snd_soc_dai_link *dl;
 31	const int num_dl = 2;
 32
 33	dl = devm_kcalloc(dev, num_dl, sizeof(*dl), GFP_KERNEL);
 34	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
 35	if (!dl || !platform)
 36		return -ENOMEM;
 37
 38	dl->codecs = devm_kzalloc(dev, sizeof(*dl->codecs), GFP_KERNEL);
 39	if (!dl->codecs)
 40		return -ENOMEM;
 41
 42	dl->codecs->name = devm_kstrdup(dev, codec_name, GFP_KERNEL);
 43	dl->codecs->dai_name = devm_kasprintf(dev, GFP_KERNEL, "dmic-hifi");
 44	if (!dl->codecs->name || !dl->codecs->dai_name)
 45		return -ENOMEM;
 46
 47	platform->name = dev_name(dev);
 48	dl[0].num_cpus = 1;
 49	dl[0].num_codecs = 1;
 50	dl[0].platforms = platform;
 51	dl[0].num_platforms = 1;
 52	dl[0].nonatomic = 1;
 53	dl[0].no_pcm = 1;
 54	dl[0].capture_only = 1;
 55	memcpy(&dl[1], &dl[0], sizeof(*dl));
 56
 57	dl[0].name = "DMIC";
 58	dl[0].cpus = dmic_pin;
 59	dl[0].id = 0;
 60	dl[1].name = "DMIC WoV";
 61	dl[1].cpus = dmic_wov_pin;
 62	dl[1].id = 1;
 63	dl[1].ignore_suspend = 1;
 64
 65	*links = dl;
 66	*num_links = num_dl;
 67	return 0;
 68}
 69
 70static int avs_dmic_probe(struct platform_device *pdev)
 71{
 72	struct device *dev = &pdev->dev;
 73	struct snd_soc_acpi_mach *mach;
 74	struct avs_mach_pdata *pdata;
 75	struct snd_soc_card *card;
 76	int ret;
 77
 78	mach = dev_get_platdata(dev);
 79	pdata = mach->pdata;
 80
 81	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 82	if (!card)
 83		return -ENOMEM;
 84
 85	ret = avs_create_dai_links(dev, pdata->codec_name, &card->dai_link, &card->num_links);
 86	if (ret)
 87		return ret;
 88
 89	if (pdata->obsolete_card_names) {
 90		card->name = "avs_dmic";
 91	} else {
 92		card->driver_name = "avs_dmic";
 93		card->long_name = card->name = "AVS DMIC";
 94	}
 95	card->dev = dev;
 96	card->owner = THIS_MODULE;
 97	card->dapm_widgets = card_widgets;
 98	card->num_dapm_widgets = ARRAY_SIZE(card_widgets);
 99	card->dapm_routes = card_routes;
100	card->num_dapm_routes = ARRAY_SIZE(card_routes);
101	card->fully_routed = true;
102
103	return devm_snd_soc_register_deferrable_card(dev, card);
104}
105
106static const struct platform_device_id avs_dmic_driver_ids[] = {
107	{
108		.name = "avs_dmic",
109	},
110	{},
111};
112MODULE_DEVICE_TABLE(platform, avs_dmic_driver_ids);
113
114static struct platform_driver avs_dmic_driver = {
115	.probe = avs_dmic_probe,
116	.driver = {
117		.name = "avs_dmic",
118		.pm = &snd_soc_pm_ops,
119	},
120	.id_table = avs_dmic_driver_ids,
121};
122
123module_platform_driver(avs_dmic_driver);
124
125MODULE_DESCRIPTION("Intel DMIC machine driver");
126MODULE_LICENSE("GPL");