LXR linux/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
   9struct imx_spdif_data {
  10        struct snd_soc_dai_link dai;
  11        struct snd_soc_card card;
  12};
  13
  14static 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, 3 * sizeof(*comp), GFP_KERNEL);
  30        if (!data || !comp) {
  31                ret = -ENOMEM;
  32                goto end;
  33        }
  34
  35        data->dai.cpus          = &comp[0];
  36        data->dai.codecs        = &comp[1];
  37        data->dai.platforms     = &comp[2];
  38
  39        data->dai.num_cpus      = 1;
  40        data->dai.num_codecs    = 1;
  41        data->dai.num_platforms = 1;
  42
  43        data->dai.name = "S/PDIF PCM";
  44        data->dai.stream_name = "S/PDIF PCM";
  45        data->dai.codecs->dai_name = "snd-soc-dummy-dai";
  46        data->dai.codecs->name = "snd-soc-dummy";
  47        data->dai.cpus->of_node = spdif_np;
  48        data->dai.platforms->of_node = spdif_np;
  49        data->dai.playback_only = true;
  50        data->dai.capture_only = true;
  51
  52        if (of_property_read_bool(np, "spdif-out"))
  53                data->dai.capture_only = false;
  54
  55        if (of_property_read_bool(np, "spdif-in"))
  56                data->dai.playback_only = false;
  57
  58        if (data->dai.playback_only && data->dai.capture_only) {
  59                dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
  60                goto end;
  61        }
  62
  63        data->card.dev = &pdev->dev;
  64        data->card.dai_link = &data->dai;
  65        data->card.num_links = 1;
  66        data->card.owner = THIS_MODULE;
  67
  68        ret = snd_soc_of_parse_card_name(&data->card, "model");
  69        if (ret)
  70                goto end;
  71
  72        ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
  73        if (ret && ret != -EPROBE_DEFER)
  74                dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret);
  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                .pm = &snd_soc_pm_ops,
  92                .of_match_table = imx_spdif_dt_ids,
  93        },
  94        .probe = imx_spdif_audio_probe,
  95};
  96
  97module_platform_driver(imx_spdif_driver);
  98
  99MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 100MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
 101MODULE_LICENSE("GPL v2");
 102MODULE_ALIAS("platform:imx-spdif");
 103