// SPDX-License-Identifier: GPL-2.0
/*
 * Power-button driver for Dollar Cove TI PMIC
 * Copyright (C) 2014 Intel Corp
 * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
 */

#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/slab.h>

#define CHTDC_TI_SIRQ_REG       0x3
#define SIRQ_PWRBTN_REL         BIT(0)

static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)
{
        struct input_dev *input = dev_id;
        struct device *dev = input->dev.parent;
        struct regmap *regmap = dev_get_drvdata(dev);
        int state;

        if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {
                dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
                input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
                input_sync(input);
        }

        return IRQ_HANDLED;
}

static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
        struct input_dev *input;
        int irq, err;

        irq = platform_get_irq(pdev, 0);
        if (irq < 0)
                return irq;
        input = devm_input_allocate_device(dev);
        if (!input)
                return -ENOMEM;
        input->name = pdev->name;
        input->phys = "power-button/input0";
        input->id.bustype = BUS_HOST;
        input_set_capability(input, EV_KEY, KEY_POWER);
        err = input_register_device(input);
        if (err)
                return err;

        dev_set_drvdata(dev, pmic->regmap);

        err = devm_request_threaded_irq(dev, irq, NULL,
                                        chtdc_ti_pwrbtn_interrupt,
                                        IRQF_ONESHOT, KBUILD_MODNAME, input);
        if (err)
                return err;

        device_init_wakeup(dev, true);
        dev_pm_set_wake_irq(dev, irq);
        return 0;
}

static void chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
{
        dev_pm_clear_wake_irq(&pdev->dev);
        device_init_wakeup(&pdev->dev, false);
}

static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
        { .name = "chtdc_ti_pwrbtn" },
        {},
};
MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);

static struct platform_driver chtdc_ti_pwrbtn_driver = {
        .driver = {
                .name   = KBUILD_MODNAME,
        },
        .probe          = chtdc_ti_pwrbtn_probe,
        .remove         = chtdc_ti_pwrbtn_remove,
        .id_table       = chtdc_ti_pwrbtn_id_table,
};
module_platform_driver(chtdc_ti_pwrbtn_driver);

MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
MODULE_LICENSE("GPL v2");