// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ac97.c  --  ALSA Soc AC97 codec support
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
 *
 * Generic AC97 support.
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>

static const struct snd_soc_dapm_widget ac97_widgets[] = {
        SND_SOC_DAPM_INPUT("RX"),
        SND_SOC_DAPM_OUTPUT("TX"),
};

static const struct snd_soc_dapm_route ac97_routes[] = {
        { "AC97 Capture", NULL, "RX" },
        { "TX", NULL, "AC97 Playback" },
};

static int ac97_prepare(struct snd_pcm_substream *substream,
                        struct snd_soc_dai *dai)
{
        struct snd_soc_component *component = dai->component;
        struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);

        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
        return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
}

static const struct snd_soc_dai_ops ac97_dai_ops = {
        .prepare        = ac97_prepare,
};

static struct snd_soc_dai_driver ac97_dai = {
        .name = "ac97-hifi",
        .playback = {
                .stream_name = "AC97 Playback",
                .channels_min = 1,
                .channels_max = 2,
                .rates = SNDRV_PCM_RATE_KNOT,
                .formats = SND_SOC_STD_AC97_FMTS,},
        .capture = {
                .stream_name = "AC97 Capture",
                .channels_min = 1,
                .channels_max = 2,
                .rates = SNDRV_PCM_RATE_KNOT,
                .formats = SND_SOC_STD_AC97_FMTS,},
        .ops = &ac97_dai_ops,
};

static int ac97_soc_probe(struct snd_soc_component *component)
{
        struct snd_ac97 *ac97;
        struct snd_ac97_bus *ac97_bus;
        struct snd_ac97_template ac97_template;
        int ret;

        /* add codec as bus device for standard ac97 */
        ret = snd_ac97_bus(component->card->snd_card, 0, soc_ac97_ops,
                           NULL, &ac97_bus);
        if (ret < 0)
                return ret;

        memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
        if (ret < 0)
                return ret;

        snd_soc_component_set_drvdata(component, ac97);

        return 0;
}

#ifdef CONFIG_PM
static int ac97_soc_suspend(struct snd_soc_component *component)
{
        struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);

        snd_ac97_suspend(ac97);

        return 0;
}

static int ac97_soc_resume(struct snd_soc_component *component)
{

        struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);

        snd_ac97_resume(ac97);

        return 0;
}
#else
#define ac97_soc_suspend NULL
#define ac97_soc_resume NULL
#endif

static const struct snd_soc_component_driver soc_component_dev_ac97 = {
        .probe                  = ac97_soc_probe,
        .suspend                = ac97_soc_suspend,
        .resume                 = ac97_soc_resume,
        .dapm_widgets           = ac97_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(ac97_widgets),
        .dapm_routes            = ac97_routes,
        .num_dapm_routes        = ARRAY_SIZE(ac97_routes),
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
};

static int ac97_probe(struct platform_device *pdev)
{
        return devm_snd_soc_register_component(&pdev->dev,
                        &soc_component_dev_ac97, &ac97_dai, 1);
}

#ifdef CONFIG_OF
static const struct of_device_id ac97_codec_of_match[] = {
        { .compatible = "realtek,alc203", },
        { }
};
MODULE_DEVICE_TABLE(of, ac97_codec_of_match);
#endif

static struct platform_driver ac97_codec_driver = {
        .driver = {
                .name = "ac97-codec",
                .of_match_table = of_match_ptr(ac97_codec_of_match),
        },

        .probe = ac97_probe,
};

module_platform_driver(ac97_codec_driver);

MODULE_DESCRIPTION("Soc Generic AC97 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ac97-codec");