// SPDX-License-Identifier: GPL-2.0-only
/*
 * ALSA SoC SPDIF DIT driver
 *
 *  This driver is used by controllers which can operate in DIT (SPDI/F) where
 *  no codec is needed.  This file provides stub codec that can be used
 *  in these configurations. TI DaVinci Audio controller uses this driver.
 *
 * Author:      Steve Chen,  <schen@mvista.com>
 * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
 * Copyright:   (C) 2009  Texas Instruments, India
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <sound/soc.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <linux/of.h>

#define DRV_NAME "spdif-dit"

#define STUB_RATES      (SNDRV_PCM_RATE_8000_768000 | \
                         SNDRV_PCM_RATE_128000)
#define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S16_LE | \
                        SNDRV_PCM_FMTBIT_S20_3LE | \
                        SNDRV_PCM_FMTBIT_S24_LE  | \
                        SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dapm_widget dit_widgets[] = {
        SND_SOC_DAPM_OUTPUT("spdif-out"),
};

static const struct snd_soc_dapm_route dit_routes[] = {
        { "spdif-out", NULL, "Playback" },
};

static const struct snd_soc_component_driver soc_codec_spdif_dit = {
        .dapm_widgets           = dit_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(dit_widgets),
        .dapm_routes            = dit_routes,
        .num_dapm_routes        = ARRAY_SIZE(dit_routes),
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
};

static struct snd_soc_dai_driver dit_stub_dai = {
        .name           = "dit-hifi",
        .playback       = {
                .stream_name    = "Playback",
                .channels_min   = 1,
                .channels_max   = 384,
                .rates          = STUB_RATES,
                .formats        = STUB_FORMATS,
        },
};

static int spdif_dit_probe(struct platform_device *pdev)
{
        return devm_snd_soc_register_component(&pdev->dev,
                        &soc_codec_spdif_dit,
                        &dit_stub_dai, 1);
}

#ifdef CONFIG_OF
static const struct of_device_id spdif_dit_dt_ids[] = {
        { .compatible = "linux,spdif-dit", },
        { }
};
MODULE_DEVICE_TABLE(of, spdif_dit_dt_ids);
#endif

static struct platform_driver spdif_dit_driver = {
        .probe          = spdif_dit_probe,
        .driver         = {
                .name   = DRV_NAME,
                .of_match_table = of_match_ptr(spdif_dit_dt_ids),
        },
};

module_platform_driver(spdif_dit_driver);

MODULE_AUTHOR("Steve Chen <schen@mvista.com>");
MODULE_DESCRIPTION("SPDIF dummy codec driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);