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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * MXM WMI driver4 *5 * Copyright(C) 2010 Red Hat.6 */7#include <linux/kernel.h>8#include <linux/module.h>9#include <linux/init.h>10#include <linux/mxm-wmi.h>11#include <linux/acpi.h>12 13MODULE_AUTHOR("Dave Airlie");14MODULE_DESCRIPTION("MXM WMI Driver");15MODULE_LICENSE("GPL");16 17#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"18 19MODULE_ALIAS("wmi:"MXM_WMMX_GUID);20 21#define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */22#define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */23 24struct mxds_args {25 u32 func;26 u32 args;27 u32 xarg;28};29 30int mxm_wmi_call_mxds(int adapter)31{32 struct mxds_args args = {33 .func = MXM_WMMX_FUNC_MXDS,34 .args = 0,35 .xarg = 1,36 };37 struct acpi_buffer input = { (acpi_size)sizeof(args), &args };38 acpi_status status;39 40 printk("calling mux switch %d\n", adapter);41 42 status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, NULL);43 44 if (ACPI_FAILURE(status))45 return status;46 47 printk("mux switched %d\n", status);48 return 0;49 50}51EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);52 53int mxm_wmi_call_mxmx(int adapter)54{55 struct mxds_args args = {56 .func = MXM_WMMX_FUNC_MXMX,57 .args = 0,58 .xarg = 1,59 };60 struct acpi_buffer input = { (acpi_size)sizeof(args), &args };61 acpi_status status;62 63 printk("calling mux switch %d\n", adapter);64 65 status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input, NULL);66 67 if (ACPI_FAILURE(status))68 return status;69 70 printk("mux mutex set switched %d\n", status);71 return 0;72 73}74EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);75 76bool mxm_wmi_supported(void)77{78 bool guid_valid;79 guid_valid = wmi_has_guid(MXM_WMMX_GUID);80 return guid_valid;81}82EXPORT_SYMBOL_GPL(mxm_wmi_supported);83 84static int __init mxm_wmi_init(void)85{86 return 0;87}88 89static void __exit mxm_wmi_exit(void)90{91}92 93module_init(mxm_wmi_init);94module_exit(mxm_wmi_exit);95