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e521d16e76
Adds lenovo-wmi-helpers, which provides a common wrapper function for wmidev_evaluate_method that does data validation and error handling. Reviewed-by: Alok Tiwari <alok.a.tiwari@oracle.com> Reviewed-by: Armin Wolf <W_Armin@gmx.de> Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Derek J. Clark <derekjohn.clark@gmail.com> Link: https://lore.kernel.org/r/20250702033826.1057762-3-derekjohn.clark@gmail.com Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Lenovo Legion WMI helpers driver.
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*
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* The Lenovo Legion WMI interface is broken up into multiple GUID interfaces
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* that require cross-references between GUID's for some functionality. The
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* "Custom Mode" interface is a legacy interface for managing and displaying
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* CPU & GPU power and hwmon settings and readings. The "Other Mode" interface
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* is a modern interface that replaces or extends the "Custom Mode" interface
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* methods. The "Gamezone" interface adds advanced features such as fan
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* profiles and overclocking. The "Lighting" interface adds control of various
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* status lights related to different hardware components. Each of these
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* drivers uses a common procedure to get data from the WMI interface,
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* enumerated here.
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*
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* Copyright (C) 2025 Derek J. Clark <derekjohn.clark@gmail.com>
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*/
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#include <linux/acpi.h>
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#include <linux/cleanup.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/wmi.h>
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#include "wmi-helpers.h"
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/**
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* lwmi_dev_evaluate_int() - Helper function for calling WMI methods that
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* return an integer.
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* @wdev: Pointer to the WMI device to be called.
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* @instance: Instance of the called method.
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* @method_id: WMI Method ID for the method to be called.
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* @buf: Buffer of all arguments for the given method_id.
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* @size: Length of the buffer.
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* @retval: Pointer for the return value to be assigned.
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*
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* Calls wmidev_evaluate_method for Lenovo WMI devices that return an ACPI
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* integer. Validates the return value type and assigns the value to the
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* retval pointer.
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*
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* Return: 0 on success, or an error code.
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*/
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int lwmi_dev_evaluate_int(struct wmi_device *wdev, u8 instance, u32 method_id,
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unsigned char *buf, size_t size, u32 *retval)
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{
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *ret_obj __free(kfree) = NULL;
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struct acpi_buffer input = { size, buf };
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acpi_status status;
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status = wmidev_evaluate_method(wdev, instance, method_id, &input,
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&output);
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if (ACPI_FAILURE(status))
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return -EIO;
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if (retval) {
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ret_obj = output.pointer;
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if (!ret_obj)
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return -ENODATA;
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if (ret_obj->type != ACPI_TYPE_INTEGER)
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return -ENXIO;
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*retval = (u32)ret_obj->integer.value;
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}
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return 0;
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};
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EXPORT_SYMBOL_NS_GPL(lwmi_dev_evaluate_int, "LENOVO_WMI_HELPERS");
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MODULE_AUTHOR("Derek J. Clark <derekjohn.clark@gmail.com>");
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MODULE_DESCRIPTION("Lenovo WMI Helpers Driver");
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MODULE_LICENSE("GPL");
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