1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * MXM WMI driver
4 *
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, instance: 0x0, method_id: adapter, in: &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, instance: 0x0, method_id: adapter, in: &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

source code of linux/drivers/platform/x86/mxm-wmi.c