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Linux/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 static const struct snd_soc_dapm_widget dir_widgets[] = {
 27         SND_SOC_DAPM_INPUT("spdif-in"),
 28 };
 29 
 30 static 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 
 40 static 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 
 47 static 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 
 58 static 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 
 64 static 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
 71 static const struct of_device_id spdif_dir_dt_ids[] = {
 72         { .compatible = "linux,spdif-dir", },
 73         { }
 74 };
 75 MODULE_DEVICE_TABLE(of, spdif_dir_dt_ids);
 76 #endif
 77 
 78 static struct platform_driver spdif_dir_driver = {
 79         .probe          = spdif_dir_probe,
 80         .remove         = spdif_dir_remove,
 81         .driver         = {
 82                 .name   = "spdif-dir",
 83                 .owner  = THIS_MODULE,
 84                 .of_match_table = of_match_ptr(spdif_dir_dt_ids),
 85         },
 86 };
 87 
 88 module_platform_driver(spdif_dir_driver);
 89 
 90 MODULE_DESCRIPTION("ASoC SPDIF DIR driver");
 91 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
 92 MODULE_LICENSE("GPL");
 93 

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