// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved.
 *
 * max98357a.c -- MAX98357A ALSA SoC Codec driver
 */

#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/mod_devicetable.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 max98357a_priv {
        struct gpio_desc *sdmode;
        unsigned int sdmode_delay;
        int sdmode_switch;
};

static int max98357a_daiops_trigger(struct snd_pcm_substream *substream,
                int cmd, struct snd_soc_dai *dai)
{
        struct snd_soc_component *component = dai->component;
        struct max98357a_priv *max98357a =
                snd_soc_component_get_drvdata(component);

        if (!max98357a->sdmode)
                return 0;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                mdelay(max98357a->sdmode_delay);
                if (max98357a->sdmode_switch) {
                        gpiod_set_value(max98357a->sdmode, 1);
                        dev_dbg(component->dev, "set sdmode to 1");
                }
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                gpiod_set_value(max98357a->sdmode, 0);
                dev_dbg(component->dev, "set sdmode to 0");
                break;
        }

        return 0;
}

static int max98357a_sdmode_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 max98357a_priv *max98357a =
                snd_soc_component_get_drvdata(component);

        if (event & SND_SOC_DAPM_POST_PMU)
                max98357a->sdmode_switch = 1;
        else if (event & SND_SOC_DAPM_POST_PMD)
                max98357a->sdmode_switch = 0;

        return 0;
}

static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = {
        SND_SOC_DAPM_OUTPUT("Speaker"),
        SND_SOC_DAPM_OUT_DRV_E("SD_MODE", SND_SOC_NOPM, 0, 0, NULL, 0,
                        max98357a_sdmode_event,
                        SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
};

static const struct snd_soc_dapm_route max98357a_dapm_routes[] = {
        {"SD_MODE", NULL, "HiFi Playback"},
        {"Speaker", NULL, "SD_MODE"},
};

static const struct snd_soc_component_driver max98357a_component_driver = {
        .dapm_widgets           = max98357a_dapm_widgets,
        .num_dapm_widgets       = ARRAY_SIZE(max98357a_dapm_widgets),
        .dapm_routes            = max98357a_dapm_routes,
        .num_dapm_routes        = ARRAY_SIZE(max98357a_dapm_routes),
        .idle_bias_on           = 1,
        .use_pmdown_time        = 1,
        .endianness             = 1,
};

static const struct snd_soc_dai_ops max98357a_dai_ops = {
        .trigger        = max98357a_daiops_trigger,
};

static struct snd_soc_dai_driver max98357a_dai_driver = {
        .name = "HiFi",
        .playback = {
                .stream_name    = "HiFi Playback",
                .formats        = SNDRV_PCM_FMTBIT_S16 |
                                        SNDRV_PCM_FMTBIT_S24 |
                                        SNDRV_PCM_FMTBIT_S32,
                .rates          = SNDRV_PCM_RATE_8000 |
                                        SNDRV_PCM_RATE_16000 |
                                        SNDRV_PCM_RATE_32000 |
                                        SNDRV_PCM_RATE_44100 |
                                        SNDRV_PCM_RATE_48000 |
                                        SNDRV_PCM_RATE_88200 |
                                        SNDRV_PCM_RATE_96000,
                .rate_min       = 8000,
                .rate_max       = 96000,
                .channels_min   = 1,
                .channels_max   = 2,
        },
        .ops    = &max98357a_dai_ops,
};

static int max98357a_platform_probe(struct platform_device *pdev)
{
        struct max98357a_priv *max98357a;
        int ret;

        max98357a = devm_kzalloc(&pdev->dev, sizeof(*max98357a), GFP_KERNEL);
        if (!max98357a)
                return -ENOMEM;

        max98357a->sdmode = devm_gpiod_get_optional(&pdev->dev,
                                "sdmode", GPIOD_OUT_LOW);
        if (IS_ERR(max98357a->sdmode))
                return PTR_ERR(max98357a->sdmode);

        ret = device_property_read_u32(&pdev->dev, "sdmode-delay",
                                        &max98357a->sdmode_delay);
        if (ret) {
                max98357a->sdmode_delay = 0;
                dev_dbg(&pdev->dev,
                        "no optional property 'sdmode-delay' found, "
                        "default: no delay\n");
        }

        dev_set_drvdata(&pdev->dev, max98357a);

        return devm_snd_soc_register_component(&pdev->dev,
                        &max98357a_component_driver,
                        &max98357a_dai_driver, 1);
}

#ifdef CONFIG_OF
static const struct of_device_id max98357a_device_id[] = {
        { .compatible = "maxim,max98357a" },
        { .compatible = "maxim,max98360a" },
        {}
};
MODULE_DEVICE_TABLE(of, max98357a_device_id);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id max98357a_acpi_match[] = {
        { "MX98357A", 0 },
        { "MX98360A", 0 },
        {},
};
MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match);
#endif

static struct platform_driver max98357a_platform_driver = {
        .driver = {
                .name = "max98357a",
                .of_match_table = of_match_ptr(max98357a_device_id),
                .acpi_match_table = ACPI_PTR(max98357a_acpi_match),
        },
        .probe  = max98357a_platform_probe,
};
module_platform_driver(max98357a_platform_driver);

MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver");
MODULE_LICENSE("GPL v2");