cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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spdif_transmitter.c (2302B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * ALSA SoC SPDIF DIT driver
      4 *
      5 *  This driver is used by controllers which can operate in DIT (SPDI/F) where
      6 *  no codec is needed.  This file provides stub codec that can be used
      7 *  in these configurations. TI DaVinci Audio controller uses this driver.
      8 *
      9 * Author:      Steve Chen,  <schen@mvista.com>
     10 * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
     11 * Copyright:   (C) 2009  Texas Instruments, India
     12 */
     13
     14#include <linux/module.h>
     15#include <linux/moduleparam.h>
     16#include <linux/slab.h>
     17#include <sound/soc.h>
     18#include <sound/pcm.h>
     19#include <sound/initval.h>
     20#include <linux/of.h>
     21
     22#define DRV_NAME "spdif-dit"
     23
     24#define STUB_RATES	SNDRV_PCM_RATE_8000_192000
     25#define STUB_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | \
     26			SNDRV_PCM_FMTBIT_S20_3LE | \
     27			SNDRV_PCM_FMTBIT_S24_LE  | \
     28			SNDRV_PCM_FMTBIT_S32_LE)
     29
     30static const struct snd_soc_dapm_widget dit_widgets[] = {
     31	SND_SOC_DAPM_OUTPUT("spdif-out"),
     32};
     33
     34static const struct snd_soc_dapm_route dit_routes[] = {
     35	{ "spdif-out", NULL, "Playback" },
     36};
     37
     38static struct snd_soc_component_driver soc_codec_spdif_dit = {
     39	.dapm_widgets		= dit_widgets,
     40	.num_dapm_widgets	= ARRAY_SIZE(dit_widgets),
     41	.dapm_routes		= dit_routes,
     42	.num_dapm_routes	= ARRAY_SIZE(dit_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 dit_stub_dai = {
     50	.name		= "dit-hifi",
     51	.playback 	= {
     52		.stream_name	= "Playback",
     53		.channels_min	= 1,
     54		.channels_max	= 384,
     55		.rates		= STUB_RATES,
     56		.formats	= STUB_FORMATS,
     57	},
     58};
     59
     60static int spdif_dit_probe(struct platform_device *pdev)
     61{
     62	return devm_snd_soc_register_component(&pdev->dev,
     63			&soc_codec_spdif_dit,
     64			&dit_stub_dai, 1);
     65}
     66
     67#ifdef CONFIG_OF
     68static const struct of_device_id spdif_dit_dt_ids[] = {
     69	{ .compatible = "linux,spdif-dit", },
     70	{ }
     71};
     72MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
     73#endif
     74
     75static struct platform_driver spdif_dit_driver = {
     76	.probe		= spdif_dit_probe,
     77	.driver		= {
     78		.name	= DRV_NAME,
     79		.of_match_table = of_match_ptr(spdif_dit_dt_ids),
     80	},
     81};
     82
     83module_platform_driver(spdif_dit_driver);
     84
     85MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
     86MODULE_DESCRIPTION("SPDIF dummy codec driver");
     87MODULE_LICENSE("GPL");
     88MODULE_ALIAS("platform:" DRV_NAME);