LXR linux/sound/soc/codecs/spdif

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ALSA SoC SPDIF DIR (Digital Interface Reciever) driver
   4 *
   5 * Based on ALSA SoC SPDIF DIT driver
   6 *
   7 *  This driver is used by controllers which can operate in DIR (SPDI/F) where
   8 *  no codec is needed.  This file provides stub codec that can be used
   9 *  in these configurations. SPEAr SPDIF IN Audio controller uses this driver.
  10 *
  11 * Author:      Vipin Kumar,  <vipin.kumar@st.com>
  12 * Copyright:   (C) 2012  ST Microelectronics
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/moduleparam.h>
  17#include <linux/slab.h>
  18#include <sound/soc.h>
  19#include <sound/pcm.h>
  20#include <sound/initval.h>
  21#include <linux/of.h>
  22
  23static const struct snd_soc_dapm_widget dir_widgets[] = {
  24        SND_SOC_DAPM_INPUT("spdif-in"),
  25};
  26
  27static const struct snd_soc_dapm_route dir_routes[] = {
  28        { "Capture", NULL, "spdif-in" },
  29};
  30
  31#define STUB_RATES      SNDRV_PCM_RATE_8000_192000
  32#define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
  33                        SNDRV_PCM_FMTBIT_S20_3LE | \
  34                        SNDRV_PCM_FMTBIT_S24_LE  | \
  35                        SNDRV_PCM_FMTBIT_S32_LE | \
  36                        SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
  37
  38static struct snd_soc_component_driver soc_codec_spdif_dir = {
  39        .dapm_widgets           = dir_widgets,
  40        .num_dapm_widgets       = ARRAY_SIZE(dir_widgets),
  41        .dapm_routes            = dir_routes,
  42        .num_dapm_routes        = ARRAY_SIZE(dir_routes),
  43        .idle_bias_on           = 1,
  44        .use_pmdown_time        = 1,
  45        .endianness             = 1,
  46        .non_legacy_dai_naming  = 1,
  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 devm_snd_soc_register_component(&pdev->dev,
  63                        &soc_codec_spdif_dir,
  64                        &dir_stub_dai, 1);
  65}
  66
  67#ifdef CONFIG_OF
  68static const struct of_device_id spdif_dir_dt_ids[] = {
  69        { .compatible = "linux,spdif-dir", },
  70        { }
  71};
  72MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
  73#endif
  74
  75static struct platform_driver spdif_dir_driver = {
  76        .probe          = spdif_dir_probe,
  77        .driver         = {
  78                .name   = "spdif-dir",
  79                .of_match_table = of_match_ptr(spdif_dir_dt_ids),
  80        },
  81};
  82
  83module_platform_driver(spdif_dir_driver);
  84
  85MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
  86MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
  87MODULE_LICENSE("GPL");
  88