// SPDX-License-Identifier: GPL-2.0-only
/*
 * Acer Wireless Radio Control Driver
 *
 * Copyright (C) 2017 Endless Mobile, Inc.
 */

#include <linux/acpi.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci_ids.h>
#include <linux/platform_device.h>
#include <linux/types.h>

static const struct acpi_device_id acer_wireless_acpi_ids[] = {
        {"10251229", 0},
        {"", 0},
};
MODULE_DEVICE_TABLE(acpi, acer_wireless_acpi_ids);

static void acer_wireless_notify(acpi_handle handle, u32 event, void *data)
{
        struct device *dev = data;
        struct input_dev *idev = dev_get_drvdata(dev);

        dev_dbg(dev, "event=%#x\n", event);
        if (event != 0x80) {
                dev_notice(dev, "Unknown SMKB event: %#x\n", event);
                return;
        }
        input_report_key(idev, KEY_RFKILL, 1);
        input_sync(idev);
        input_report_key(idev, KEY_RFKILL, 0);
        input_sync(idev);
}

static int acer_wireless_probe(struct platform_device *pdev)
{
        struct acpi_device *adev;
        struct input_dev *idev;
        int ret;

        adev = ACPI_COMPANION(&pdev->dev);
        if (!adev)
                return -ENODEV;

        idev = devm_input_allocate_device(&pdev->dev);
        if (!idev)
                return -ENOMEM;

        platform_set_drvdata(pdev, idev);
        idev->name = "Acer Wireless Radio Control";
        idev->phys = "acer-wireless/input0";
        idev->id.bustype = BUS_HOST;
        idev->id.vendor = PCI_VENDOR_ID_AI;
        idev->id.product = 0x1229;
        set_bit(EV_KEY, idev->evbit);
        set_bit(KEY_RFKILL, idev->keybit);

        ret = input_register_device(idev);
        if (ret)
                return ret;

        return acpi_dev_install_notify_handler(adev, ACPI_DEVICE_NOTIFY,
                                               acer_wireless_notify,
                                               &pdev->dev);
}

static void acer_wireless_remove(struct platform_device *pdev)
{
        acpi_dev_remove_notify_handler(ACPI_COMPANION(&pdev->dev),
                                       ACPI_DEVICE_NOTIFY,
                                       acer_wireless_notify);
}

static struct platform_driver acer_wireless_driver = {
        .probe = acer_wireless_probe,
        .remove = acer_wireless_remove,
        .driver = {
                .name = "Acer Wireless Radio Control Driver",
                .acpi_match_table = acer_wireless_acpi_ids,
        },
};
module_platform_driver(acer_wireless_driver);

MODULE_DESCRIPTION("Acer Wireless Radio Control Driver");
MODULE_AUTHOR("Chris Chiu <chiu@gmail.com>");
MODULE_LICENSE("GPL v2");