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
imx_spdif_audio_probe(struct platform_device * pdev)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 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 = &asoc_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
77 end:
78 of_node_put(spdif_np);
79
80 return ret;
81 }
82
83 static const struct of_device_id imx_spdif_dt_ids[] = {
84 { .compatible = "fsl,imx-audio-spdif", },
85 { /* sentinel */ }
86 };
87 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
88
89 static 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
98 module_platform_driver(imx_spdif_driver);
99
100 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
101 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
102 MODULE_LICENSE("GPL v2");
103 MODULE_ALIAS("platform:imx-spdif");
104