xref: /openbmc/linux/drivers/platform/x86/mxm-wmi.c (revision 727cc014)
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