linux/sound/soc/fsl/imx-spdif.c
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   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
  16struct imx_spdif_data {
  17        struct snd_soc_dai_link dai;
  18        struct snd_soc_card card;
  19};
  20
  21static 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
  64        ret = snd_soc_of_parse_card_name(&data->card, "model");
  65        if (ret)
  66                goto end;
  67
  68        ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
  69        if (ret) {
  70                dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret);
  71                goto end;
  72        }
  73
  74        platform_set_drvdata(pdev, data);
  75
  76end:
  77        of_node_put(spdif_np);
  78
  79        return ret;
  80}
  81
  82static const struct of_device_id imx_spdif_dt_ids[] = {
  83        { .compatible = "fsl,imx-audio-spdif", },
  84        { /* sentinel */ }
  85};
  86MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
  87
  88static struct platform_driver imx_spdif_driver = {
  89        .driver = {
  90                .name = "imx-spdif",
  91                .of_match_table = imx_spdif_dt_ids,
  92        },
  93        .probe = imx_spdif_audio_probe,
  94};
  95
  96module_platform_driver(imx_spdif_driver);
  97
  98MODULE_AUTHOR("Freescale Semiconductor, Inc.");
  99MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
 100MODULE_LICENSE("GPL v2");
 101MODULE_ALIAS("platform:imx-spdif");
 102
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