LXR linux/sound/soc/codecs/spdif

   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
  26static const struct snd_soc_dapm_widget dir_widgets[] = {
  27        SND_SOC_DAPM_INPUT("spdif-in"),
  28};
  29
  30static const struct snd_soc_dapm_route dir_routes[] = {
  31        { "Capture", NULL, "spdif-in" },
  32};
  33
  34#define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  35#define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
  36                        SNDRV_PCM_FMTBIT_S20_3LE | \
  37                        SNDRV_PCM_FMTBIT_S24_LE | \
  38                        SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
  39
  40static struct snd_soc_codec_driver soc_codec_spdif_dir = {
  41        .dapm_widgets = dir_widgets,
  42        .num_dapm_widgets = ARRAY_SIZE(dir_widgets),
  43        .dapm_routes = dir_routes,
  44        .num_dapm_routes = ARRAY_SIZE(dir_routes),
  45};
  46
  47static struct snd_soc_dai_driver dir_stub_dai = {
  48        .name           = "dir-hifi",
  49        .capture        = {
  50                .stream_name    = "Capture",
  51                .channels_min   = 1,
  52                .channels_max   = 384,
  53                .rates          = STUB_RATES,
  54                .formats        = STUB_FORMATS,
  55        },
  56};
  57
  58static int spdif_dir_probe(struct platform_device *pdev)
  59{
  60        return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir,
  61                        &dir_stub_dai, 1);
  62}
  63
  64static int spdif_dir_remove(struct platform_device *pdev)
  65{
  66        snd_soc_unregister_codec(&pdev->dev);
  67        return 0;
  68}
  69
  70#ifdef CONFIG_OF
  71static const struct of_device_id spdif_dir_dt_ids[] = {
  72        { .compatible = "linux,spdif-dir", },
  73        { }
  74};
  75MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
  76#endif
  77
  78static struct platform_driver spdif_dir_driver = {
  79        .probe          = spdif_dir_probe,
  80        .remove         = spdif_dir_remove,
  81        .driver         = {
  82                .name   = "spdif-dir",
  83                .of_match_table = of_match_ptr(spdif_dir_dt_ids),
  84        },
  85};
  86
  87module_platform_driver(spdif_dir_driver);
  88
  89MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
  90MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
  91MODULE_LICENSE("GPL");
  92