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
13 MODULE_AUTHOR("Dave Airlie");
14 MODULE_DESCRIPTION("MXM WMI Driver");
15 MODULE_LICENSE("GPL");
16
17 #define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
18
19 MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
20
21 #define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
22 #define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
23
24 struct mxds_args {
25 u32 func;
26 u32 args;
27 u32 xarg;
28 };
29
mxm_wmi_call_mxds(int adapter)30 int 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 }
53 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
54
mxm_wmi_call_mxmx(int adapter)55 int 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 }
78 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
79
mxm_wmi_supported(void)80 bool mxm_wmi_supported(void)
81 {
82 bool guid_valid;
83 guid_valid = wmi_has_guid(MXM_WMMX_GUID);
84 return guid_valid;
85 }
86 EXPORT_SYMBOL_GPL(mxm_wmi_supported);
87
mxm_wmi_init(void)88 static int __init mxm_wmi_init(void)
89 {
90 return 0;
91 }
92
mxm_wmi_exit(void)93 static void __exit mxm_wmi_exit(void)
94 {
95 }
96
97 module_init(mxm_wmi_init);
98 module_exit(mxm_wmi_exit);
99