// SPDX-License-Identifier: GPL-2.0-only
//
// rt1015p.c  --  RT1015P ALSA SoC audio amplifier driver
//
// Copyright 2020 The Linux Foundation. All rights reserved.

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <sound/soc-dapm.h>

struct rt1015p_priv {
        struct gpio_desc *sdb;
        bool calib_done;
};

static int rt1015p_sdb_event(struct snd_soc_dapm_widget *w,
                struct snd_kcontrol *kcontrol, int event)
{
        struct snd_soc_component *component =
                snd_soc_dapm_to_component(w->dapm);
        struct rt1015p_priv *rt1015p =
                snd_soc_component_get_drvdata(component);

        if (!rt1015p->sdb)
                return 0;

        switch (event) {
        case SND_SOC_DAPM_PRE_PMU:
                gpiod_set_value_cansleep(rt1015p->sdb, 1);
                dev_dbg(component->dev, "set sdb to 1");

                if (!rt1015p->calib_done) {
                        msleep(300);
                        rt1015p->calib_done = true;
                }
                break;
        case SND_SOC_DAPM_POST_PMD:
                gpiod_set_value_cansleep(rt1015p->sdb, 0);
                dev_dbg(component->dev, "set sdb to 0");
                break;
        default:
                break;
        }

        return 0;
}

static const struct snd_soc_dapm_widget rt1015p_dapm_widgets[] = {
        SND_SOC_DAPM_OUTPUT("Speaker"),
        SND_SOC_DAPM_OUT_DRV_E("SDB", SND_SOC_NOPM, 0, 0, NULL, 0,
                        rt1015p_sdb_event,
                        SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
};

static const struct snd_soc_dapm_route rt1015p_dapm_routes[] = {
        {"SDB", NULL, "HiFi Playback"},
        {"Speaker", NULL, "SDB"},
};

#ifdef CONFIG_PM
static int rt1015p_suspend(struct snd_soc_component *component)
{
        struct rt1015p_priv *rt1015p = snd_soc_component_get_drvdata(component);

        rt1015p->calib_done = false;
        return 0;
}
#else
#define rt1015p_suspend NULL
#endif

static const struct snd_soc_component_driver rt1015p_component_driver = {
        .suspend                = rt1015p_suspend,
        .dapm_widgets           = rt1015p_dapm_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(rt1015p_dapm_widgets),
        .dapm_routes            = rt1015p_dapm_routes,
        .num_dapm_routes        = ARRAY_SIZE(rt1015p_dapm_routes),
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
};

static struct snd_soc_dai_driver rt1015p_dai_driver = {
        .name = "HiFi",
        .playback = {
                .stream_name    = "HiFi Playback",
                .formats        = SNDRV_PCM_FMTBIT_S24 |
                                        SNDRV_PCM_FMTBIT_S32,
                .rates          = SNDRV_PCM_RATE_48000,
                .channels_min   = 1,
                .channels_max   = 2,
        },
};

static int rt1015p_platform_probe(struct platform_device *pdev)
{
        struct rt1015p_priv *rt1015p;

        rt1015p = devm_kzalloc(&pdev->dev, sizeof(*rt1015p), GFP_KERNEL);
        if (!rt1015p)
                return -ENOMEM;

        rt1015p->sdb = devm_gpiod_get_optional(&pdev->dev,
                                "sdb", GPIOD_OUT_LOW);
        if (IS_ERR(rt1015p->sdb))
                return PTR_ERR(rt1015p->sdb);

        dev_set_drvdata(&pdev->dev, rt1015p);

        return devm_snd_soc_register_component(&pdev->dev,
                        &rt1015p_component_driver,
                        &rt1015p_dai_driver, 1);
}

#ifdef CONFIG_OF
static const struct of_device_id rt1015p_device_id[] = {
        { .compatible = "realtek,rt1015p" },
        { .compatible = "realtek,rt1019p" },
        {}
};
MODULE_DEVICE_TABLE(of, rt1015p_device_id);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id rt1015p_acpi_match[] = {
        { "RTL1015", 0},
        { "RTL1019", 0},
        { },
};
MODULE_DEVICE_TABLE(acpi, rt1015p_acpi_match);
#endif

static struct platform_driver rt1015p_platform_driver = {
        .driver = {
                .name = "rt1015p",
                .of_match_table = of_match_ptr(rt1015p_device_id),
                .acpi_match_table = ACPI_PTR(rt1015p_acpi_match),
        },
        .probe = rt1015p_platform_probe,
};
module_platform_driver(rt1015p_platform_driver);

MODULE_DESCRIPTION("ASoC RT1015P driver");
MODULE_LICENSE("GPL v2");