sound/soc/fsl/imx-spdif.c

   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
  16 struct imx_spdif_data {
  17         struct snd_soc_dai_link dai;
  18         struct snd_soc_card card;
  19 };
  20
  21 static 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
  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");