// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Alienware LEGACY WMI device driver
 *
 * Copyright (C) 2025 Kurt Borja <kuurtb@gmail.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/wmi.h>
#include "alienware-wmi.h"

struct legacy_led_args {
        struct color_platform colors;
        u8 brightness;
        u8 state;
} __packed;


/*
 * Legacy WMI driver
 */
static int legacy_wmi_update_led(struct alienfx_priv *priv,
                                 struct wmi_device *wdev, u8 location)
{
        struct legacy_led_args legacy_args = {
                .colors = priv->colors[location],
                .brightness = priv->global_brightness,
                .state = 0,
        };
        struct acpi_buffer input;
        acpi_status status;

        if (legacy_args.state != LEGACY_RUNNING) {
                legacy_args.state = priv->lighting_control_state;

                input.length = sizeof(legacy_args);
                input.pointer = &legacy_args;

                status = wmi_evaluate_method(LEGACY_POWER_CONTROL_GUID, 0,
                                             location + 1, &input, NULL);
                if (ACPI_FAILURE(status))
                        return -EIO;

                return 0;
        }

        return alienware_wmi_command(wdev, location + 1, &legacy_args,
                                     sizeof(legacy_args), NULL);
}

static int legacy_wmi_update_brightness(struct alienfx_priv *priv,
                                        struct wmi_device *wdev, u8 brightness)
{
        return legacy_wmi_update_led(priv, wdev, 0);
}

static int legacy_wmi_probe(struct wmi_device *wdev, const void *context)
{
        struct alienfx_platdata pdata = {
                .wdev = wdev,
                .ops = {
                        .upd_led = legacy_wmi_update_led,
                        .upd_brightness = legacy_wmi_update_brightness,
                },
        };

        return alienware_alienfx_setup(&pdata);
}

static const struct wmi_device_id alienware_legacy_device_id_table[] = {
        { LEGACY_CONTROL_GUID, NULL },
        { },
};
MODULE_DEVICE_TABLE(wmi, alienware_legacy_device_id_table);

static struct wmi_driver alienware_legacy_wmi_driver = {
        .driver = {
                .name = "alienware-wmi-alienfx",
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
        },
        .id_table = alienware_legacy_device_id_table,
        .probe = legacy_wmi_probe,
        .no_singleton = true,
};

int __init alienware_legacy_wmi_init(void)
{
        return wmi_driver_register(&alienware_legacy_wmi_driver);
}

void __exit alienware_legacy_wmi_exit(void)
{
        wmi_driver_unregister(&alienware_legacy_wmi_driver);
}