1// SPDX-License-Identifier: GPL-2.0+
  2//
  3// Copyright (C) 2013 Freescale Semiconductor, Inc.
  4
  5#include <linux/module.h>
  6#include <linux/of_platform.h>
  7#include <sound/soc.h>
  8
  9struct imx_spdif_data {
 10	struct snd_soc_dai_link dai;
 11	struct snd_soc_card card;
 12};
 13
 14static int imx_spdif_audio_probe(struct platform_device *pdev)
 15{
 16	struct device_node *spdif_np, *np = pdev->dev.of_node;
 17	struct imx_spdif_data *data;
 18	struct snd_soc_dai_link_component *comp;
 19	int ret = 0;
 20
 21	spdif_np = of_parse_phandle(np, "spdif-controller", 0);
 22	if (!spdif_np) {
 23		dev_err(&pdev->dev, "failed to find spdif-controller\n");
 24		ret = -EINVAL;
 25		goto end;
 26	}
 27
 28	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 29	comp = devm_kzalloc(&pdev->dev, sizeof(*comp), GFP_KERNEL);
 30	if (!data || !comp) {
 31		ret = -ENOMEM;
 32		goto end;
 33	}
 34
 35	/*
 36	 * CPU == Platform
 37	 * platform is using soc-generic-dmaengine-pcm
 38	 */
 39	data->dai.cpus		=
 40	data->dai.platforms	= comp;
 41	data->dai.codecs	= &snd_soc_dummy_dlc;
 42
 43	data->dai.num_cpus	= 1;
 44	data->dai.num_codecs	= 1;
 45	data->dai.num_platforms	= 1;
 46
 47	data->dai.name = "S/PDIF PCM";
 48	data->dai.stream_name = "S/PDIF PCM";
 49	data->dai.cpus->of_node = spdif_np;
 50	data->dai.playback_only = true;
 51	data->dai.capture_only = true;
 52
 53	if (of_property_read_bool(np, "spdif-out"))
 54		data->dai.capture_only = false;
 55
 56	if (of_property_read_bool(np, "spdif-in"))
 57		data->dai.playback_only = false;
 58
 59	if (data->dai.playback_only && data->dai.capture_only) {
 60		dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
 61		goto end;
 62	}
 63
 64	data->card.dev = &pdev->dev;
 65	data->card.dai_link = &data->dai;
 66	data->card.num_links = 1;
 67	data->card.owner = THIS_MODULE;
 68
 69	ret = snd_soc_of_parse_card_name(&data->card, "model");
 70	if (ret)
 71		goto end;
 72
 73	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
 74	if (ret)
 75		dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
 76
 77end:
 78	of_node_put(spdif_np);
 79
 80	return ret;
 81}
 82
 83static const struct of_device_id imx_spdif_dt_ids[] = {
 84	{ .compatible = "fsl,imx-audio-spdif", },
 85	{ /* sentinel */ }
 86};
 87MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
 88
 89static struct platform_driver imx_spdif_driver = {
 90	.driver = {
 91		.name = "imx-spdif",
 92		.pm = &snd_soc_pm_ops,
 93		.of_match_table = imx_spdif_dt_ids,
 94	},
 95	.probe = imx_spdif_audio_probe,
 96};
 97
 98module_platform_driver(imx_spdif_driver);
 99
100MODULE_AUTHOR("Freescale Semiconductor, Inc.");
101MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
102MODULE_LICENSE("GPL v2");
103MODULE_ALIAS("platform:imx-spdif");