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        .component_driver = {
  42                .dapm_widgets           = dir_widgets,
  43                .num_dapm_widgets       = ARRAY_SIZE(dir_widgets),
  44                .dapm_routes            = dir_routes,
  45                .num_dapm_routes        = ARRAY_SIZE(dir_routes),
  46        },
  47};
  48
  49static struct snd_soc_dai_driver dir_stub_dai = {
  50        .name           = "dir-hifi",
  51        .capture        = {
  52                .stream_name    = "Capture",
  53                .channels_min   = 1,
  54                .channels_max   = 384,
  55                .rates          = STUB_RATES,
  56                .formats        = STUB_FORMATS,
  57        },
  58};
  59
  60static int spdif_dir_probe(struct platform_device *pdev)
  61{
  62        return snd_soc_register_codec(&pdev->dev, &soc_codec_spdif_dir,
  63                        &dir_stub_dai, 1);
  64}
  65
  66static int spdif_dir_remove(struct platform_device *pdev)
  67{
  68        snd_soc_unregister_codec(&pdev->dev);
  69        return 0;
  70}
  71
  72#ifdef CONFIG_OF
  73static const struct of_device_id spdif_dir_dt_ids[] = {
  74        { .compatible = "linux,spdif-dir", },
  75        { }
  76};
  77MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
  78#endif
  79
  80static struct platform_driver spdif_dir_driver = {
  81        .probe          = spdif_dir_probe,
  82        .remove         = spdif_dir_remove,
  83        .driver         = {
  84                .name   = "spdif-dir",
  85                .of_match_table = of_match_ptr(spdif_dir_dt_ids),
  86        },
  87};
  88
  89module_platform_driver(spdif_dir_driver);
  90
  91MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
  92MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
  93MODULE_LICENSE("GPL");
  94