1/*
2 * MXM WMI driver
3 *
4 * Copyright(C) 2010 Red Hat.
5 *
6 *  This program is free software; you can redistribute it and/or modify
7 *  it under the terms of the GNU General Public License as published by
8 *  the Free Software Foundation; either version 2 of the License, or
9 *  (at your option) any later version.
10 *
11 *  This program is distributed in the hope that it will be useful,
12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *  GNU General Public License for more details.
15 *
16 *  You should have received a copy of the GNU General Public License
17 *  along with this program; if not, write to the Free Software
18 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 */
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/mxm-wmi.h>
24#include <linux/acpi.h>
25
26MODULE_AUTHOR("Dave Airlie");
27MODULE_DESCRIPTION("MXM WMI Driver");
28MODULE_LICENSE("GPL");
29
30#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
31
32MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
33
34#define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
35#define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
36
37struct mxds_args {
38	u32 func;
39	u32 args;
40	u32 xarg;
41};
42
43int mxm_wmi_call_mxds(int adapter)
44{
45	struct mxds_args args = {
46		.func = MXM_WMMX_FUNC_MXDS,
47		.args = 0,
48		.xarg = 1,
49	};
50	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
51	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
52	acpi_status status;
53
54	printk("calling mux switch %d\n", adapter);
55
56	status = wmi_evaluate_method(MXM_WMMX_GUID, 0x1, adapter, &input,
57				     &output);
58
59	if (ACPI_FAILURE(status))
60		return status;
61
62	printk("mux switched %d\n", status);
63	return 0;
64
65}
66EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
67
68int mxm_wmi_call_mxmx(int adapter)
69{
70	struct mxds_args args = {
71		.func = MXM_WMMX_FUNC_MXMX,
72		.args = 0,
73		.xarg = 1,
74	};
75	struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
76	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
77	acpi_status status;
78
79	printk("calling mux switch %d\n", adapter);
80
81	status = wmi_evaluate_method(MXM_WMMX_GUID, 0x1, adapter, &input,
82				     &output);
83
84	if (ACPI_FAILURE(status))
85		return status;
86
87	printk("mux mutex set switched %d\n", status);
88	return 0;
89
90}
91EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
92
93bool mxm_wmi_supported(void)
94{
95	bool guid_valid;
96	guid_valid = wmi_has_guid(MXM_WMMX_GUID);
97	return guid_valid;
98}
99EXPORT_SYMBOL_GPL(mxm_wmi_supported);
100
101static int __init mxm_wmi_init(void)
102{
103	return 0;
104}
105
106static void __exit mxm_wmi_exit(void)
107{
108}
109
110module_init(mxm_wmi_init);
111module_exit(mxm_wmi_exit);
112