// SPDX-License-Identifier: GPL-2.0
/*
 * Power-button driver for Basin Cove PMIC
 *
 * Copyright (c) 2019, Intel Corporation.
 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 */

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

#define BCOVE_PBSTATUS          0x27
#define BCOVE_PBSTATUS_PBLVL    BIT(4)  /* 1 - release, 0 - press */

static irqreturn_t mrfld_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);
        unsigned int state;
        int ret;

        ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
        if (ret)
                return IRQ_NONE;

        dev_dbg(dev, "PBSTATUS=0x%x\n", state);
        input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
        input_sync(input);

        regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
        return IRQ_HANDLED;
}

static int mrfld_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, ret;

        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->dev.parent = dev;
        input_set_capability(input, EV_KEY, KEY_POWER);
        ret = input_register_device(input);
        if (ret)
                return ret;

        dev_set_drvdata(dev, pmic->regmap);

        ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
                                        IRQF_ONESHOT | IRQF_SHARED, pdev->name,
                                        input);
        if (ret)
                return ret;

        regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
        regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);

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

static void mrfld_pwrbtn_remove(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;

        dev_pm_clear_wake_irq(dev);
        device_init_wakeup(dev, false);
}

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

static struct platform_driver mrfld_pwrbtn_driver = {
        .driver = {
                .name   = "mrfld_bcove_pwrbtn",
        },
        .probe          = mrfld_pwrbtn_probe,
        .remove         = mrfld_pwrbtn_remove,
        .id_table       = mrfld_pwrbtn_id_table,
};
module_platform_driver(mrfld_pwrbtn_driver);

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