sound/soc/fsl/imx-spdif.c

   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");