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	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
39	acpi_status status;
40
41	printk("calling mux switch %d\n", adapter);
42
43	status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
44				     &output);
45
46	if (ACPI_FAILURE(status))
47		return status;
48
49	printk("mux switched %d\n", status);
50	return 0;
51
52}
53EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
54
55int mxm_wmi_call_mxmx(int adapter)
56{
57	struct mxds_args args = {
58		.func = MXM_WMMX_FUNC_MXMX,
59		.args = 0,
60		.xarg = 1,
61	};
62	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
63	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
64	acpi_status status;
65
66	printk("calling mux switch %d\n", adapter);
67
68	status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
69				     &output);
70
71	if (ACPI_FAILURE(status))
72		return status;
73
74	printk("mux mutex set switched %d\n", status);
75	return 0;
76
77}
78EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
79
80bool mxm_wmi_supported(void)
81{
82	bool guid_valid;
83	guid_valid = wmi_has_guid(MXM_WMMX_GUID);
84	return guid_valid;
85}
86EXPORT_SYMBOL_GPL(mxm_wmi_supported);
87
88static int __init mxm_wmi_init(void)
89{
90	return 0;
91}
92
93static void __exit mxm_wmi_exit(void)
94{
95}
96
97module_init(mxm_wmi_init);
98module_exit(mxm_wmi_exit);
99