sound/soc/codecs/spdif_receiver.c

   1 /*
   2  * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
   3  *
   4  * Based on ALSA SoC SPDIF DIT driver
   5  *
   6  *  This driver is used by controllers which can operate in DIR (SPDI/F) where
   7  *  no codec is needed.  This file provides stub codec that can be used
   8  *  in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
   9  *
  10  * Author:      Vipin Kumar,  <vipin.kumar@st.com>
  11  * Copyright:   (C) 2012  ST Microelectronics
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/slab.h>
  21 #include <sound/soc.h>
  22 #include <sound/pcm.h>
  23 #include <sound/initval.h>
  24 #include <linux/of.h>
  25
  26 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  27 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
  28                         SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
  29
  30 static struct snd_soc_codec_driver soc_codec_spdif_dir;
  31
  32 static struct snd_soc_dai_driver dir_stub_dai = {
  33         .name           = "dir-hifi",
  34         .capture        = {
  35                 .stream_name    = "Capture",
  36                 .channels_min   = 1,
  37                 .channels_max   = 384,
  38                 .rates          = STUB_RATES,
  39                 .formats        = STUB_FORMATS,
  40         },
  41 };
  42
  43 static int spdif_dir_probe(struct platform_device *pdev)
  44 {
  45         return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir,
  46                         &dir_stub_dai, 1);
  47 }
  48
  49 static int spdif_dir_remove(struct platform_device *pdev)
  50 {
  51         snd_soc_unregister_codec(&pdev->dev);
  52         return 0;
  53 }
  54
  55 #ifdef CONFIG_OF
  56 static const struct of_device_id spdif_dir_dt_ids[] = {
  57         { .compatible = "linux,spdif-dir", },
  58         { }
  59 };
  60 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
  61 #endif
  62
  63 static struct platform_driver spdif_dir_driver = {
  64         .probe          = spdif_dir_probe,
  65         .remove         = spdif_dir_remove,
  66         .driver         = {
  67                 .name   = "spdif-dir",
  68                 .owner  = THIS_MODULE,
  69                 .of_match_table = of_match_ptr(spdif_dir_dt_ids),
  70         },
  71 };
  72
  73 module_platform_driver(spdif_dir_driver);
  74
  75 MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
  76 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
  77 MODULE_LICENSE("GPL");