// SPDX-License-Identifier: GPL-2.0
/*
 * WMI Thunderbolt driver
 *
 * Copyright (C) 2017 Dell Inc. All Rights Reserved.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/device.h>
#include <linux/fs.h>
#include <linux/hex.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/wmi.h>

#define INTEL_WMI_THUNDERBOLT_GUID "86CCFD48-205E-4A77-9C48-2021CBEDE341"

static ssize_t force_power_store(struct device *dev,
                                 struct device_attribute *attr,
                                 const char *buf, size_t count)
{
        struct wmi_buffer buffer;
        int ret;
        u8 mode;

        buffer.length = sizeof(mode);
        buffer.data = &mode;

        mode = hex_to_bin(buf[0]);
        if (mode > 1)
                return -EINVAL;

        ret = wmidev_invoke_method(to_wmi_device(dev), 0, 1, &buffer, NULL);
        if (ret < 0)
                return ret;

        return count;
}

static DEVICE_ATTR_WO(force_power);

static struct attribute *tbt_attrs[] = {
        &dev_attr_force_power.attr,
        NULL
};
ATTRIBUTE_GROUPS(tbt);

static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = {
        { .guid_string = INTEL_WMI_THUNDERBOLT_GUID },
        { },
};

static struct wmi_driver intel_wmi_thunderbolt_driver = {
        .driver = {
                .name = "intel-wmi-thunderbolt",
                .dev_groups = tbt_groups,
        },
        .id_table = intel_wmi_thunderbolt_id_table,
        .no_singleton = true,
};

module_wmi_driver(intel_wmi_thunderbolt_driver);

MODULE_DEVICE_TABLE(wmi, intel_wmi_thunderbolt_id_table);
MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>");
MODULE_DESCRIPTION("Intel WMI Thunderbolt force power driver");
MODULE_LICENSE("GPL v2");