sound/soc/codecs/hdmi_spdif.c

   1 /*
   2  * ALSA SoC SPDIF DIT driver
   3  *
   4  *  This driver is used by controllers which can operate in DIT (SPDI/F) where
   5  *  no codec is needed.  This file provides stub codec that can be used
   6  *  in these configurations. TI DaVinci Audio controller uses this driver.
   7  *
   8  * Author:      Steve Chen,  <schen@mvista.com>
   9  * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
  10  * Copyright:   (C) 2009  Texas Instruments, India
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/slab.h>
  20 #include <linux/of.h>
  21 #include <linux/of_gpio.h>
  22 #include <sound/soc.h>
  23 #include <sound/pcm.h>
  24 #include <sound/initval.h>
  25
  26 #define DRV_NAME "spdif-dit"
  27
  28 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  29 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
  30
  31
  32 static struct snd_soc_codec_driver soc_codec_spdif_dit;
  33
  34 static struct snd_soc_dai_driver dit_stub_dai = {
  35         .name           = "rk-hdmi-spdif-hifi",
  36         .playback       = {
  37                 .stream_name    = "Playback",
  38                 .channels_min   = 1,
  39                 .channels_max   = 384,
  40                 .rates          = STUB_RATES,
  41                 .formats        = STUB_FORMATS,
  42         },
  43 };
  44
  45 static int hdmi_spdif_audio_probe(struct platform_device *pdev)
  46 {
  47         int ret;
  48
  49         ret = snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dit,
  50                                      &dit_stub_dai, 1);
  51
  52         if (ret)
  53                 dev_err(&pdev->dev, "%s register failed: %d\n",
  54                         __func__, ret);
  55
  56         return ret;
  57 }
  58
  59 static int hdmi_spdif_audio_remove(struct platform_device *pdev)
  60 {
  61         snd_soc_unregister_codec(&pdev->dev);
  62
  63         return 0;
  64 }
  65
  66 #ifdef CONFIG_OF
  67 static const struct of_device_id hdmi_spdif_of_match[] = {
  68         { .compatible = "hdmi-spdif", },
  69         {},
  70 };
  71 MODULE_DEVICE_TABLE(of, hdmi_spdif_of_match);
  72 #endif /* CONFIG_OF */
  73
  74 static struct platform_driver hdmi_spdif_audio_driver = {
  75         .driver = {
  76                 .name = "hdmi-spdif",
  77                 .of_match_table = of_match_ptr(hdmi_spdif_of_match),
  78         },
  79         .probe = hdmi_spdif_audio_probe,
  80         .remove = hdmi_spdif_audio_remove,
  81 };
  82
  83 module_platform_driver(hdmi_spdif_audio_driver);
  84
  85 MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
  86 MODULE_DESCRIPTION("SPDIF dummy codec driver");
  87 MODULE_LICENSE("GPL");
  88 MODULE_ALIAS("platform:" DRV_NAME);