1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * MXM WMI driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright(C) 2010 Red Hat.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/kernel.h>
8*4882a593Smuzhiyun #include <linux/module.h>
9*4882a593Smuzhiyun #include <linux/init.h>
10*4882a593Smuzhiyun #include <linux/mxm-wmi.h>
11*4882a593Smuzhiyun #include <linux/acpi.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun MODULE_AUTHOR("Dave Airlie");
14*4882a593Smuzhiyun MODULE_DESCRIPTION("MXM WMI Driver");
15*4882a593Smuzhiyun MODULE_LICENSE("GPL");
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
22*4882a593Smuzhiyun #define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun struct mxds_args {
25*4882a593Smuzhiyun u32 func;
26*4882a593Smuzhiyun u32 args;
27*4882a593Smuzhiyun u32 xarg;
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
mxm_wmi_call_mxds(int adapter)30*4882a593Smuzhiyun int mxm_wmi_call_mxds(int adapter)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun struct mxds_args args = {
33*4882a593Smuzhiyun .func = MXM_WMMX_FUNC_MXDS,
34*4882a593Smuzhiyun .args = 0,
35*4882a593Smuzhiyun .xarg = 1,
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
38*4882a593Smuzhiyun struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
39*4882a593Smuzhiyun acpi_status status;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun printk("calling mux switch %d\n", adapter);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
44*4882a593Smuzhiyun &output);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun if (ACPI_FAILURE(status))
47*4882a593Smuzhiyun return status;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun printk("mux switched %d\n", status);
50*4882a593Smuzhiyun return 0;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
54*4882a593Smuzhiyun
mxm_wmi_call_mxmx(int adapter)55*4882a593Smuzhiyun int mxm_wmi_call_mxmx(int adapter)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct mxds_args args = {
58*4882a593Smuzhiyun .func = MXM_WMMX_FUNC_MXMX,
59*4882a593Smuzhiyun .args = 0,
60*4882a593Smuzhiyun .xarg = 1,
61*4882a593Smuzhiyun };
62*4882a593Smuzhiyun struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
63*4882a593Smuzhiyun struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
64*4882a593Smuzhiyun acpi_status status;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun printk("calling mux switch %d\n", adapter);
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
69*4882a593Smuzhiyun &output);
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun if (ACPI_FAILURE(status))
72*4882a593Smuzhiyun return status;
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun printk("mux mutex set switched %d\n", status);
75*4882a593Smuzhiyun return 0;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
79*4882a593Smuzhiyun
mxm_wmi_supported(void)80*4882a593Smuzhiyun bool mxm_wmi_supported(void)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun bool guid_valid;
83*4882a593Smuzhiyun guid_valid = wmi_has_guid(MXM_WMMX_GUID);
84*4882a593Smuzhiyun return guid_valid;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(mxm_wmi_supported);
87*4882a593Smuzhiyun
mxm_wmi_init(void)88*4882a593Smuzhiyun static int __init mxm_wmi_init(void)
89*4882a593Smuzhiyun {
90*4882a593Smuzhiyun return 0;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
mxm_wmi_exit(void)93*4882a593Smuzhiyun static void __exit mxm_wmi_exit(void)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun module_init(mxm_wmi_init);
98*4882a593Smuzhiyun module_exit(mxm_wmi_exit);
99