// SPDX-License-Identifier: GPL-2.0+
//
// soc-util.c  --  ALSA SoC Audio Layer utility functions
//
// Copyright 2009 Wolfson Microelectronics PLC.
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
//         Liam Girdwood <lrg@slimlogic.co.uk>

#include <linux/platform_device.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots)
{
        return sample_size * channels * tdm_slots;
}
EXPORT_SYMBOL_GPL(snd_soc_calc_frame_size);

int snd_soc_params_to_frame_size(struct snd_pcm_hw_params *params)
{
        int sample_size;

        sample_size = snd_pcm_format_width(params_format(params));
        if (sample_size < 0)
                return sample_size;

        return snd_soc_calc_frame_size(sample_size, params_channels(params),
                                       1);
}
EXPORT_SYMBOL_GPL(snd_soc_params_to_frame_size);

int snd_soc_calc_bclk(int fs, int sample_size, int channels, int tdm_slots)
{
        return fs * snd_soc_calc_frame_size(sample_size, channels, tdm_slots);
}
EXPORT_SYMBOL_GPL(snd_soc_calc_bclk);

int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
{
        int ret;

        ret = snd_soc_params_to_frame_size(params);

        if (ret > 0)
                return ret * params_rate(params);
        else
                return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);

static const struct snd_pcm_hardware dummy_dma_hardware = {
        /* Random values to keep userspace happy when checking constraints */
        .info                   = SNDRV_PCM_INFO_INTERLEAVED |
                                  SNDRV_PCM_INFO_BLOCK_TRANSFER,
        .buffer_bytes_max       = 128*1024,
        .period_bytes_min       = PAGE_SIZE,
        .period_bytes_max       = PAGE_SIZE*2,
        .periods_min            = 2,
        .periods_max            = 128,
};

static int dummy_dma_open(struct snd_soc_component *component,
                          struct snd_pcm_substream *substream)
{
        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);

        /* BE's dont need dummy params */
        if (!rtd->dai_link->no_pcm)
                snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);

        return 0;
}

static const struct snd_soc_component_driver dummy_platform = {
        .open           = dummy_dma_open,
};

static const struct snd_soc_component_driver dummy_codec = {
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
        .non_legacy_dai_naming  = 1,
};

#define STUB_RATES      SNDRV_PCM_RATE_8000_384000
#define STUB_FORMATS    (SNDRV_PCM_FMTBIT_S8 | \
                        SNDRV_PCM_FMTBIT_U8 | \
                        SNDRV_PCM_FMTBIT_S16_LE | \
                        SNDRV_PCM_FMTBIT_U16_LE | \
                        SNDRV_PCM_FMTBIT_S24_LE | \
                        SNDRV_PCM_FMTBIT_S24_3LE | \
                        SNDRV_PCM_FMTBIT_U24_LE | \
                        SNDRV_PCM_FMTBIT_S32_LE | \
                        SNDRV_PCM_FMTBIT_U32_LE | \
                        SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
/*
 * The dummy CODEC is only meant to be used in situations where there is no
 * actual hardware.
 *
 * If there is actual hardware even if it does not have a control bus
 * the hardware will still have constraints like supported samplerates, etc.
 * which should be modelled. And the data flow graph also should be modelled
 * using DAPM.
 */
static struct snd_soc_dai_driver dummy_dai = {
        .name = "snd-soc-dummy-dai",
        .playback = {
                .stream_name    = "Playback",
                .channels_min   = 1,
                .channels_max   = 384,
                .rates          = STUB_RATES,
                .formats        = STUB_FORMATS,
        },
        .capture = {
                .stream_name    = "Capture",
                .channels_min   = 1,
                .channels_max   = 384,
                .rates = STUB_RATES,
                .formats = STUB_FORMATS,
         },
};

int snd_soc_dai_is_dummy(struct snd_soc_dai *dai)
{
        if (dai->driver == &dummy_dai)
                return 1;
        return 0;
}

int snd_soc_component_is_dummy(struct snd_soc_component *component)
{
        return ((component->driver == &dummy_platform) ||
                (component->driver == &dummy_codec));
}

static int snd_soc_dummy_probe(struct platform_device *pdev)
{
        int ret;

        ret = devm_snd_soc_register_component(&pdev->dev,
                                              &dummy_codec, &dummy_dai, 1);
        if (ret < 0)
                return ret;

        ret = devm_snd_soc_register_component(&pdev->dev, &dummy_platform,
                                              NULL, 0);

        return ret;
}

static struct platform_driver soc_dummy_driver = {
        .driver = {
                .name = "snd-soc-dummy",
        },
        .probe = snd_soc_dummy_probe,
};

static struct platform_device *soc_dummy_dev;

int __init snd_soc_util_init(void)
{
        int ret;

        soc_dummy_dev =
                platform_device_register_simple("snd-soc-dummy", -1, NULL, 0);
        if (IS_ERR(soc_dummy_dev))
                return PTR_ERR(soc_dummy_dev);

        ret = platform_driver_register(&soc_dummy_driver);
        if (ret != 0)
                platform_device_unregister(soc_dummy_dev);

        return ret;
}

void __exit snd_soc_util_exit(void)
{
        platform_driver_unregister(&soc_dummy_driver);
        platform_device_unregister(soc_dummy_dev);
}