xref: /openbmc/linux/sound/soc/fsl/imx-spdif.c (revision ae213c44)
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 
9 struct imx_spdif_data {
10 	struct snd_soc_dai_link dai;
11 	struct snd_soc_card card;
12 };
13 
14 static 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 	int ret = 0;
19 
20 	spdif_np = of_parse_phandle(np, "spdif-controller", 0);
21 	if (!spdif_np) {
22 		dev_err(&pdev->dev, "failed to find spdif-controller\n");
23 		ret = -EINVAL;
24 		goto end;
25 	}
26 
27 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
28 	if (!data) {
29 		ret = -ENOMEM;
30 		goto end;
31 	}
32 
33 	data->dai.name = "S/PDIF PCM";
34 	data->dai.stream_name = "S/PDIF PCM";
35 	data->dai.codec_dai_name = "snd-soc-dummy-dai";
36 	data->dai.codec_name = "snd-soc-dummy";
37 	data->dai.cpu_of_node = spdif_np;
38 	data->dai.platform_of_node = spdif_np;
39 	data->dai.playback_only = true;
40 	data->dai.capture_only = true;
41 
42 	if (of_property_read_bool(np, "spdif-out"))
43 		data->dai.capture_only = false;
44 
45 	if (of_property_read_bool(np, "spdif-in"))
46 		data->dai.playback_only = false;
47 
48 	if (data->dai.playback_only && data->dai.capture_only) {
49 		dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
50 		goto end;
51 	}
52 
53 	data->card.dev = &pdev->dev;
54 	data->card.dai_link = &data->dai;
55 	data->card.num_links = 1;
56 	data->card.owner = THIS_MODULE;
57 
58 	ret = snd_soc_of_parse_card_name(&data->card, "model");
59 	if (ret)
60 		goto end;
61 
62 	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
63 	if (ret && ret != -EPROBE_DEFER)
64 		dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret);
65 
66 end:
67 	of_node_put(spdif_np);
68 
69 	return ret;
70 }
71 
72 static const struct of_device_id imx_spdif_dt_ids[] = {
73 	{ .compatible = "fsl,imx-audio-spdif", },
74 	{ /* sentinel */ }
75 };
76 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
77 
78 static struct platform_driver imx_spdif_driver = {
79 	.driver = {
80 		.name = "imx-spdif",
81 		.pm = &snd_soc_pm_ops,
82 		.of_match_table = imx_spdif_dt_ids,
83 	},
84 	.probe = imx_spdif_audio_probe,
85 };
86 
87 module_platform_driver(imx_spdif_driver);
88 
89 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
90 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
91 MODULE_LICENSE("GPL v2");
92 MODULE_ALIAS("platform:imx-spdif");
93