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[2];
  18         struct snd_soc_card card;
  19         struct platform_device *txdev;
  20         struct platform_device *rxdev;
  21 };
  22
  23 static int imx_spdif_audio_probe(struct platform_device *pdev)
  24 {
  25         struct device_node *spdif_np, *np = pdev->dev.of_node;
  26         struct imx_spdif_data *data;
  27         int ret = 0, num_links = 0;
  28
  29         spdif_np = of_parse_phandle(np, "spdif-controller", 0);
  30         if (!spdif_np) {
  31                 dev_err(&pdev->dev, "failed to find spdif-controller\n");
  32                 ret = -EINVAL;
  33                 goto end;
  34         }
  35
  36         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  37         if (!data) {
  38                 dev_err(&pdev->dev, "failed to allocate memory\n");
  39                 ret = -ENOMEM;
  40                 goto end;
  41         }
  42
  43         if (of_property_read_bool(np, "spdif-out")) {
  44                 data->dai[num_links].name = "S/PDIF TX";
  45                 data->dai[num_links].stream_name = "S/PDIF PCM Playback";
  46                 data->dai[num_links].codec_dai_name = "dit-hifi";
  47                 data->dai[num_links].codec_name = "spdif-dit";
  48                 data->dai[num_links].cpu_of_node = spdif_np;
  49                 data->dai[num_links].platform_of_node = spdif_np;
  50                 num_links++;
  51
  52                 data->txdev = platform_device_register_simple("spdif-dit", -1, NULL, 0);
  53                 if (IS_ERR(data->txdev)) {
  54                         ret = PTR_ERR(data->txdev);
  55                         dev_err(&pdev->dev, "register dit failed: %d\n", ret);
  56                         goto end;
  57                 }
  58         }
  59
  60         if (of_property_read_bool(np, "spdif-in")) {
  61                 data->dai[num_links].name = "S/PDIF RX";
  62                 data->dai[num_links].stream_name = "S/PDIF PCM Capture";
  63                 data->dai[num_links].codec_dai_name = "dir-hifi";
  64                 data->dai[num_links].codec_name = "spdif-dir";
  65                 data->dai[num_links].cpu_of_node = spdif_np;
  66                 data->dai[num_links].platform_of_node = spdif_np;
  67                 num_links++;
  68
  69                 data->rxdev = platform_device_register_simple("spdif-dir", -1, NULL, 0);
  70                 if (IS_ERR(data->rxdev)) {
  71                         ret = PTR_ERR(data->rxdev);
  72                         dev_err(&pdev->dev, "register dir failed: %d\n", ret);
  73                         goto error_dit;
  74                 }
  75         }
  76
  77         if (!num_links) {
  78                 dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
  79                 goto error_dir;
  80         }
  81
  82         data->card.dev = &pdev->dev;
  83         data->card.num_links = num_links;
  84         data->card.dai_link = data->dai;
  85
  86         ret = snd_soc_of_parse_card_name(&data->card, "model");
  87         if (ret)
  88                 goto error_dir;
  89
  90         ret = snd_soc_register_card(&data->card);
  91         if (ret) {
  92                 dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret);
  93                 goto error_dir;
  94         }
  95
  96         platform_set_drvdata(pdev, data);
  97
  98         goto end;
  99
 100 error_dir:
 101         if (data->rxdev)
 102                 platform_device_unregister(data->rxdev);
 103 error_dit:
 104         if (data->txdev)
 105                 platform_device_unregister(data->txdev);
 106 end:
 107         if (spdif_np)
 108                 of_node_put(spdif_np);
 109
 110         return ret;
 111 }
 112
 113 static int imx_spdif_audio_remove(struct platform_device *pdev)
 114 {
 115         struct imx_spdif_data *data = platform_get_drvdata(pdev);
 116
 117         if (data->rxdev)
 118                 platform_device_unregister(data->rxdev);
 119         if (data->txdev)
 120                 platform_device_unregister(data->txdev);
 121
 122         snd_soc_unregister_card(&data->card);
 123
 124         return 0;
 125 }
 126
 127 static const struct of_device_id imx_spdif_dt_ids[] = {
 128         { .compatible = "fsl,imx-audio-spdif", },
 129         { /* sentinel */ }
 130 };
 131 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
 132
 133 static struct platform_driver imx_spdif_driver = {
 134         .driver = {
 135                 .name = "imx-spdif",
 136                 .owner = THIS_MODULE,
 137                 .of_match_table = imx_spdif_dt_ids,
 138         },
 139         .probe = imx_spdif_audio_probe,
 140         .remove = imx_spdif_audio_remove,
 141 };
 142
 143 module_platform_driver(imx_spdif_driver);
 144
 145 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 146 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
 147 MODULE_LICENSE("GPL v2");
 148 MODULE_ALIAS("platform:imx-spdif");