1/*
  2 * Copyright (C) 2013 Freescale Semiconductor, Inc.
  3 *
  4 * The code contained herein is licensed under the GNU General Public
  5 * License. You may obtain a copy of the GNU General Public License
  6 * Version 2 or later at the following locations:
  7 *
  8 * http://www.opensource.org/licenses/gpl-license.html
  9 * http://www.gnu.org/copyleft/gpl.html
 10 */
 11
 12#include <linux/module.h>
 13#include <linux/of_platform.h>
 14#include <sound/soc.h>
 15
 16struct imx_spdif_data {
 17	struct snd_soc_dai_link dai;
 18	struct snd_soc_card card;
 19};
 20
 21static int imx_spdif_audio_probe(struct platform_device *pdev)
 22{
 23	struct device_node *spdif_np, *np = pdev->dev.of_node;
 24	struct imx_spdif_data *data;
 25	int ret = 0;
 26
 27	spdif_np = of_parse_phandle(np, "spdif-controller", 0);
 28	if (!spdif_np) {
 29		dev_err(&pdev->dev, "failed to find spdif-controller\n");
 30		ret = -EINVAL;
 31		goto end;
 32	}
 33
 34	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 35	if (!data) {
 36		ret = -ENOMEM;
 37		goto end;
 38	}
 39
 40	data->dai.name = "S/PDIF PCM";
 41	data->dai.stream_name = "S/PDIF PCM";
 42	data->dai.codec_dai_name = "snd-soc-dummy-dai";
 43	data->dai.codec_name = "snd-soc-dummy";
 44	data->dai.cpu_of_node = spdif_np;
 45	data->dai.platform_of_node = spdif_np;
 46	data->dai.playback_only = true;
 47	data->dai.capture_only = true;
 48
 49	if (of_property_read_bool(np, "spdif-out"))
 50		data->dai.capture_only = false;
 51
 52	if (of_property_read_bool(np, "spdif-in"))
 53		data->dai.playback_only = false;
 54
 55	if (data->dai.playback_only && data->dai.capture_only) {
 56		dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
 57		goto end;
 58	}
 59
 60	data->card.dev = &pdev->dev;
 61	data->card.dai_link = &data->dai;
 62	data->card.num_links = 1;
 63	data->card.owner = THIS_MODULE;
 64
 65	ret = snd_soc_of_parse_card_name(&data->card, "model");
 66	if (ret)
 67		goto end;
 68
 69	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
 70	if (ret) {
 71		dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret);
 72		goto end;
 73	}
 74
 75end:
 76	of_node_put(spdif_np);
 77
 78	return ret;
 79}
 80
 81static const struct of_device_id imx_spdif_dt_ids[] = {
 82	{ .compatible = "fsl,imx-audio-spdif", },
 83	{ /* sentinel */ }
 84};
 85MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
 86
 87static struct platform_driver imx_spdif_driver = {
 88	.driver = {
 89		.name = "imx-spdif",
 90		.pm = &snd_soc_pm_ops,
 91		.of_match_table = imx_spdif_dt_ids,
 92	},
 93	.probe = imx_spdif_audio_probe,
 94};
 95
 96module_platform_driver(imx_spdif_driver);
 97
 98MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 99MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
100MODULE_LICENSE("GPL v2");
101MODULE_ALIAS("platform:imx-spdif");