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
75	platform_set_drvdata(pdev, data);
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");
104