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         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, 2 * 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[0];
  41         data->dai.codecs        = &comp[1];
  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.codecs->dai_name = "snd-soc-dummy-dai";
  50         data->dai.codecs->name = "snd-soc-dummy";
  51         data->dai.cpus->of_node = spdif_np;
  52         data->dai.playback_only = true;
  53         data->dai.capture_only = true;
  54
  55         if (of_property_read_bool(np, "spdif-out"))
  56                 data->dai.capture_only = false;
  57
  58         if (of_property_read_bool(np, "spdif-in"))
  59                 data->dai.playback_only = false;
  60
  61         if (data->dai.playback_only && data->dai.capture_only) {
  62                 dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
  63                 goto end;
  64         }
  65
  66         data->card.dev = &pdev->dev;
  67         data->card.dai_link = &data->dai;
  68         data->card.num_links = 1;
  69         data->card.owner = THIS_MODULE;
  70
  71         ret = snd_soc_of_parse_card_name(&data->card, "model");
  72         if (ret)
  73                 goto end;
  74
  75         ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
  76         if (ret)
  77                 dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
  78
  79 end:
  80         of_node_put(spdif_np);
  81
  82         return ret;
  83 }
  84
  85 static const struct of_device_id imx_spdif_dt_ids[] = {
  86         { .compatible = "fsl,imx-audio-spdif", },
  87         { /* sentinel */ }
  88 };
  89 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
  90
  91 static struct platform_driver imx_spdif_driver = {
  92         .driver = {
  93                 .name = "imx-spdif",
  94                 .pm = &snd_soc_pm_ops,
  95                 .of_match_table = imx_spdif_dt_ids,
  96         },
  97         .probe = imx_spdif_audio_probe,
  98 };
  99
 100 module_platform_driver(imx_spdif_driver);
 101
 102 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 103 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
 104 MODULE_LICENSE("GPL v2");
 105 MODULE_ALIAS("platform:imx-spdif");