sound/soc/fsl/imx-hdmi.c

   1 /*
   2  * ASoC HDMI Transmitter driver for IMX development boards
   3  *
   4  * Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
   5  *
   6  * based on stmp3780_devb_hdmi.c
   7  *
   8  * Vladimir Barinov <vbarinov@embeddedalley.com>
   9  *
  10  * Copyright 2008 SigmaTel, Inc
  11  * Copyright 2008 Embedded Alley Solutions, Inc
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2.  This program  is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/mfd/mxc-hdmi-core.h>
  21 #include <sound/soc.h>
  22
  23 #include "imx-hdmi.h"
  24
  25 /* imx digital audio interface glue - connects codec <--> CPU */
  26 static struct snd_soc_dai_link imx_hdmi_dai_link = {
  27         .name = "i.MX HDMI Audio Tx",
  28         .stream_name = "i.MX HDMI Audio Tx",
  29         .codec_dai_name = "hdmi-hifi",
  30         .codec_name = "hdmi-audio-codec",
  31         .platform_name = "imx-hdmi-audio",
  32 };
  33
  34 static struct snd_soc_card snd_soc_card_imx_hdmi = {
  35         .name = "imx-hdmi-soc",
  36         .dai_link = &imx_hdmi_dai_link,
  37         .num_links = 1,
  38 };
  39
  40 static struct platform_device *codec_dev;
  41
  42 static int imx_hdmi_audio_probe(struct platform_device *pdev)
  43 {
  44         struct device_node *hdmi_np, *np = pdev->dev.of_node;
  45         struct snd_soc_card *card = &snd_soc_card_imx_hdmi;
  46         struct platform_device *hdmi_pdev;
  47         int ret = 0;
  48
  49         if (!hdmi_get_registered()) {
  50                 dev_err(&pdev->dev, "initialize HDMI-audio failed. load HDMI-video first!\n");
  51                 return -ENODEV;
  52         }
  53
  54         hdmi_np = of_parse_phandle(np, "hdmi-controller", 0);
  55         if (!hdmi_np) {
  56                 dev_err(&pdev->dev, "failed to find hdmi-audio cpudai\n");
  57                 ret = -EINVAL;
  58                 goto end;
  59         }
  60
  61         hdmi_pdev = of_find_device_by_node(hdmi_np);
  62         if (!hdmi_pdev) {
  63                 dev_err(&pdev->dev, "failed to find SSI platform device\n");
  64                 ret = -EINVAL;
  65                 goto end;
  66         }
  67
  68         codec_dev = platform_device_register_simple("hdmi-audio-codec", -1, NULL, 0);
  69         if (IS_ERR(codec_dev)) {
  70                 dev_err(&pdev->dev, "failed to register HDMI audio codec\n");
  71                 ret = PTR_ERR(codec_dev);
  72                 goto end;
  73         }
  74
  75         card->dev = &pdev->dev;
  76         card->dai_link->cpu_dai_name = dev_name(&hdmi_pdev->dev);
  77
  78         ret = snd_soc_register_card(card);
  79         if (ret) {
  80                 dev_err(&pdev->dev, "failed to register card: %d\n", ret);
  81                 goto err_card;
  82         }
  83
  84         goto end;
  85
  86 err_card:
  87         platform_device_unregister(codec_dev);
  88 end:
  89         if (hdmi_np)
  90                 of_node_put(hdmi_np);
  91
  92         return ret;
  93 }
  94
  95 static int imx_hdmi_audio_remove(struct platform_device *pdev)
  96 {
  97         struct snd_soc_card *card = &snd_soc_card_imx_hdmi;
  98
  99         platform_device_unregister(codec_dev);
 100         snd_soc_unregister_card(card);
 101
 102         return 0;
 103 }
 104
 105 static const struct of_device_id imx_hdmi_dt_ids[] = {
 106         { .compatible = "fsl,imx-audio-hdmi", },
 107         { /* sentinel */ }
 108 };
 109 MODULE_DEVICE_TABLE(of, imx_hdmi_dt_ids);
 110
 111 static struct platform_driver imx_hdmi_audio_driver = {
 112         .probe = imx_hdmi_audio_probe,
 113         .remove = imx_hdmi_audio_remove,
 114         .driver = {
 115                 .of_match_table = imx_hdmi_dt_ids,
 116                 .name = "imx-audio-hdmi",
 117                 .owner = THIS_MODULE,
 118         },
 119 };
 120
 121 module_platform_driver(imx_hdmi_audio_driver);
 122
 123 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 124 MODULE_DESCRIPTION("IMX HDMI TX ASoC driver");
 125 MODULE_LICENSE("GPL");
 126 MODULE_ALIAS("platform:imx-audio-hdmi");