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 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 }
51 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
52
mxm_wmi_call_mxmx(int adapter)53 int 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 }
74 EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
75
mxm_wmi_supported(void)76 bool mxm_wmi_supported(void)
77 {
78 bool guid_valid;
79 guid_valid = wmi_has_guid(MXM_WMMX_GUID);
80 return guid_valid;
81 }
82 EXPORT_SYMBOL_GPL(mxm_wmi_supported);
83
mxm_wmi_init(void)84 static int __init mxm_wmi_init(void)
85 {
86 return 0;
87 }
88
mxm_wmi_exit(void)89 static void __exit mxm_wmi_exit(void)
90 {
91 }
92
93 module_init(mxm_wmi_init);
94 module_exit(mxm_wmi_exit);
95