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Linux/sound/soc/codecs/spdif_transmitter.c

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  1 /*
  2  * ALSA SoC SPDIF DIT driver
  3  *
  4  *  This driver is used by controllers which can operate in DIT (SPDI/F) where
  5  *  no codec is needed.  This file provides stub codec that can be used
  6  *  in these configurations. TI DaVinci Audio controller uses this driver.
  7  *
  8  * Author:      Steve Chen,  <schen@mvista.com>
  9  * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
 10  * Copyright:   (C) 2009  Texas Instruments, India
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License version 2 as
 14  * published by the Free Software Foundation.
 15  */
 16 
 17 #include <linux/module.h>
 18 #include <linux/moduleparam.h>
 19 #include <linux/slab.h>
 20 #include <sound/soc.h>
 21 #include <sound/pcm.h>
 22 #include <sound/initval.h>
 23 #include <linux/of.h>
 24 
 25 #define DRV_NAME "spdif-dit"
 26 
 27 #define STUB_RATES      SNDRV_PCM_RATE_8000_192000
 28 #define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
 29                         SNDRV_PCM_FMTBIT_S20_3LE | \
 30                         SNDRV_PCM_FMTBIT_S24_LE  | \
 31                         SNDRV_PCM_FMTBIT_S32_LE)
 32 
 33 static const struct snd_soc_dapm_widget dit_widgets[] = {
 34         SND_SOC_DAPM_OUTPUT("spdif-out"),
 35 };
 36 
 37 static const struct snd_soc_dapm_route dit_routes[] = {
 38         { "spdif-out", NULL, "Playback" },
 39 };
 40 
 41 static struct snd_soc_component_driver soc_codec_spdif_dit = {
 42         .dapm_widgets           = dit_widgets,
 43         .num_dapm_widgets       = ARRAY_SIZE(dit_widgets),
 44         .dapm_routes            = dit_routes,
 45         .num_dapm_routes        = ARRAY_SIZE(dit_routes),
 46         .idle_bias_on           = 1,
 47         .use_pmdown_time        = 1,
 48         .endianness             = 1,
 49         .non_legacy_dai_naming  = 1,
 50 };
 51 
 52 static struct snd_soc_dai_driver dit_stub_dai = {
 53         .name           = "dit-hifi",
 54         .playback       = {
 55                 .stream_name    = "Playback",
 56                 .channels_min   = 1,
 57                 .channels_max   = 384,
 58                 .rates          = STUB_RATES,
 59                 .formats        = STUB_FORMATS,
 60         },
 61 };
 62 
 63 static int spdif_dit_probe(struct platform_device *pdev)
 64 {
 65         return devm_snd_soc_register_component(&pdev->dev,
 66                         &soc_codec_spdif_dit,
 67                         &dit_stub_dai, 1);
 68 }
 69 
 70 #ifdef CONFIG_OF
 71 static const struct of_device_id spdif_dit_dt_ids[] = {
 72         { .compatible = "linux,spdif-dit", },
 73         { }
 74 };
 75 MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
 76 #endif
 77 
 78 static struct platform_driver spdif_dit_driver = {
 79         .probe          = spdif_dit_probe,
 80         .driver         = {
 81                 .name   = DRV_NAME,
 82                 .of_match_table = of_match_ptr(spdif_dit_dt_ids),
 83         },
 84 };
 85 
 86 module_platform_driver(spdif_dit_driver);
 87 
 88 MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
 89 MODULE_DESCRIPTION("SPDIF dummy codec driver");
 90 MODULE_LICENSE("GPL");
 91 MODULE_ALIAS("platform:" DRV_NAME);
 92 

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