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