// SPDX-License-Identifier: GPL-2.0-only
/*
 * Marvell 88PM80x ONKEY driver
 *
 * Copyright (C) 2012 Marvell International Ltd.
 * Haojian Zhuang <haojian.zhuang@marvell.com>
 * Qiao Zhou <zhouqiao@marvell.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/mfd/88pm80x.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#define PM800_LONG_ONKEY_EN             (1 << 0)
#define PM800_LONG_KEY_DELAY            (8)     /* 1 .. 16 seconds */
#define PM800_LONKEY_PRESS_TIME         ((PM800_LONG_KEY_DELAY-1) << 4)
#define PM800_LONKEY_PRESS_TIME_MASK    (0xF0)
#define PM800_SW_PDOWN                  (1 << 5)

struct pm80x_onkey_info {
        struct input_dev *idev;
        struct pm80x_chip *pm80x;
        struct regmap *map;
        int irq;
};

/* 88PM80x gives us an interrupt when ONKEY is held */
static irqreturn_t pm80x_onkey_handler(int irq, void *data)
{
        struct pm80x_onkey_info *info = data;
        int ret = 0;
        unsigned int val;

        ret = regmap_read(info->map, PM800_STATUS_1, &val);
        if (ret < 0) {
                dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret);
                return IRQ_NONE;
        }
        val &= PM800_ONKEY_STS1;

        input_report_key(info->idev, KEY_POWER, val);
        input_sync(info->idev);

        return IRQ_HANDLED;
}

static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
                         pm80x_dev_resume);

static int pm80x_onkey_probe(struct platform_device *pdev)
{

        struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
        struct pm80x_onkey_info *info;
        int err;

        info = kzalloc_obj(*info);
        if (!info)
                return -ENOMEM;

        info->pm80x = chip;

        info->irq = platform_get_irq(pdev, 0);
        if (info->irq < 0) {
                err = -EINVAL;
                goto out;
        }

        info->map = info->pm80x->regmap;
        if (!info->map) {
                dev_err(&pdev->dev, "no regmap!\n");
                err = -EINVAL;
                goto out;
        }

        info->idev = input_allocate_device();
        if (!info->idev) {
                dev_err(&pdev->dev, "Failed to allocate input dev\n");
                err = -ENOMEM;
                goto out;
        }

        info->idev->name = "88pm80x_on";
        info->idev->phys = "88pm80x_on/input0";
        info->idev->id.bustype = BUS_I2C;
        info->idev->dev.parent = &pdev->dev;
        info->idev->evbit[0] = BIT_MASK(EV_KEY);
        __set_bit(KEY_POWER, info->idev->keybit);

        err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
                                            IRQF_ONESHOT, "onkey", info);
        if (err < 0) {
                dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
                        info->irq, err);
                goto out_reg;
        }

        err = input_register_device(info->idev);
        if (err) {
                dev_err(&pdev->dev, "Can't register input device: %d\n", err);
                goto out_irq;
        }

        platform_set_drvdata(pdev, info);

        /* Enable long onkey detection */
        regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
                           PM800_LONG_ONKEY_EN);
        /* Set 8-second interval */
        regmap_update_bits(info->map, PM800_RTC_MISC3,
                           PM800_LONKEY_PRESS_TIME_MASK,
                           PM800_LONKEY_PRESS_TIME);

        device_init_wakeup(&pdev->dev, 1);
        return 0;

out_irq:
        pm80x_free_irq(info->pm80x, info->irq, info);
out_reg:
        input_free_device(info->idev);
out:
        kfree(info);
        return err;
}

static void pm80x_onkey_remove(struct platform_device *pdev)
{
        struct pm80x_onkey_info *info = platform_get_drvdata(pdev);

        pm80x_free_irq(info->pm80x, info->irq, info);
        input_unregister_device(info->idev);
        kfree(info);
}

static struct platform_driver pm80x_onkey_driver = {
        .driver = {
                   .name = "88pm80x-onkey",
                   .pm = &pm80x_onkey_pm_ops,
                   },
        .probe = pm80x_onkey_probe,
        .remove = pm80x_onkey_remove,
};

module_platform_driver(pm80x_onkey_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
MODULE_ALIAS("platform:88pm80x-onkey");