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Linux/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 
 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 
 76 end:
 77         if (spdif_np)
 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                 .owner = THIS_MODULE,
 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");
104 

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