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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Lenovo Legion WMI helpers driver.
*
* The Lenovo Legion WMI interface is broken up into multiple GUID interfaces
* that require cross-references between GUID's for some functionality. The
* "Custom Mode" interface is a legacy interface for managing and displaying
* CPU & GPU power and hwmon settings and readings. The "Other Mode" interface
* is a modern interface that replaces or extends the "Custom Mode" interface
* methods. The "Gamezone" interface adds advanced features such as fan
* profiles and overclocking. The "Lighting" interface adds control of various
* status lights related to different hardware components. Each of these
* drivers uses a common procedure to get data from the WMI interface,
* enumerated here.
*
* Copyright (C) 2025 Derek J. Clark <derekjohn.clark@gmail.com>
*/
#include <linux/acpi.h>
#include <linux/cleanup.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/wmi.h>
#include "wmi-helpers.h"
/**
* lwmi_dev_evaluate_int() - Helper function for calling WMI methods that
* return an integer.
* @wdev: Pointer to the WMI device to be called.
* @instance: Instance of the called method.
* @method_id: WMI Method ID for the method to be called.
* @buf: Buffer of all arguments for the given method_id.
* @size: Length of the buffer.
* @retval: Pointer for the return value to be assigned.
*
* Calls wmidev_evaluate_method for Lenovo WMI devices that return an ACPI
* integer. Validates the return value type and assigns the value to the
* retval pointer.
*
* Return: 0 on success, or an error code.
*/
int lwmi_dev_evaluate_int(struct wmi_device *wdev, u8 instance, u32 method_id,
unsigned char *buf, size_t size, u32 *retval)
{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *ret_obj __free(kfree) = NULL;
struct acpi_buffer input = { size, buf };
acpi_status status;
status = wmidev_evaluate_method(wdev, instance, method_id, &input,
&output);
if (ACPI_FAILURE(status))
return -EIO;
if (retval) {
ret_obj = output.pointer;
if (!ret_obj)
return -ENODATA;
if (ret_obj->type != ACPI_TYPE_INTEGER)
return -ENXIO;
*retval = (u32)ret_obj->integer.value;
}
return 0;
};
EXPORT_SYMBOL_NS_GPL(lwmi_dev_evaluate_int, "LENOVO_WMI_HELPERS");
MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@gmail.com>");
MODULE_DESCRIPTION("Lenovo WMI Helpers Driver");
MODULE_LICENSE("GPL");
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