1 /*
2 * toshiba_wmi.c - Toshiba WMI Hotkey Driver
3 *
4 * Copyright (C) 2015 Azael Avalos <coproscefalo@gmail.com>
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 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/types.h>
24 #include <linux/acpi.h>
25 #include <linux/input.h>
26 #include <linux/input/sparse-keymap.h>
27 #include <linux/dmi.h>
28
29 MODULE_AUTHOR("Azael Avalos");
30 MODULE_DESCRIPTION("Toshiba WMI Hotkey Driver");
31 MODULE_LICENSE("GPL");
32
33 #define WMI_EVENT_GUID "59142400-C6A3-40FA-BADB-8A2652834100"
34
35 MODULE_ALIAS("wmi:"WMI_EVENT_GUID);
36
37 static struct input_dev *toshiba_wmi_input_dev;
38
39 static const struct key_entry toshiba_wmi_keymap[] __initconst = {
40 /* TODO: Add keymap values once found... */
41 /*{ KE_KEY, 0x00, { KEY_ } },*/
42 { KE_END, 0 }
43 };
44
toshiba_wmi_notify(u32 value,void * context)45 static void toshiba_wmi_notify(u32 value, void *context)
46 {
47 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
48 union acpi_object *obj;
49 acpi_status status;
50
51 status = wmi_get_event_data(value, &response);
52 if (ACPI_FAILURE(status)) {
53 pr_err("Bad event status 0x%x\n", status);
54 return;
55 }
56
57 obj = (union acpi_object *)response.pointer;
58 if (!obj)
59 return;
60
61 /* TODO: Add proper checks once we have data */
62 pr_debug("Unknown event received, obj type %x\n", obj->type);
63
64 kfree(response.pointer);
65 }
66
67 static const struct dmi_system_id toshiba_wmi_dmi_table[] __initconst = {
68 {
69 .ident = "Toshiba laptop",
70 .matches = {
71 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
72 },
73 },
74 {}
75 };
76
toshiba_wmi_input_setup(void)77 static int __init toshiba_wmi_input_setup(void)
78 {
79 acpi_status status;
80 int err;
81
82 toshiba_wmi_input_dev = input_allocate_device();
83 if (!toshiba_wmi_input_dev)
84 return -ENOMEM;
85
86 toshiba_wmi_input_dev->name = "Toshiba WMI hotkeys";
87 toshiba_wmi_input_dev->phys = "wmi/input0";
88 toshiba_wmi_input_dev->id.bustype = BUS_HOST;
89
90 err = sparse_keymap_setup(toshiba_wmi_input_dev,
91 toshiba_wmi_keymap, NULL);
92 if (err)
93 goto err_free_dev;
94
95 status = wmi_install_notify_handler(WMI_EVENT_GUID,
96 toshiba_wmi_notify, NULL);
97 if (ACPI_FAILURE(status)) {
98 err = -EIO;
99 goto err_free_dev;
100 }
101
102 err = input_register_device(toshiba_wmi_input_dev);
103 if (err)
104 goto err_remove_notifier;
105
106 return 0;
107
108 err_remove_notifier:
109 wmi_remove_notify_handler(WMI_EVENT_GUID);
110 err_free_dev:
111 input_free_device(toshiba_wmi_input_dev);
112 return err;
113 }
114
toshiba_wmi_input_destroy(void)115 static void toshiba_wmi_input_destroy(void)
116 {
117 wmi_remove_notify_handler(WMI_EVENT_GUID);
118 input_unregister_device(toshiba_wmi_input_dev);
119 }
120
toshiba_wmi_init(void)121 static int __init toshiba_wmi_init(void)
122 {
123 int ret;
124
125 if (!wmi_has_guid(WMI_EVENT_GUID) ||
126 !dmi_check_system(toshiba_wmi_dmi_table))
127 return -ENODEV;
128
129 ret = toshiba_wmi_input_setup();
130 if (ret) {
131 pr_err("Failed to setup input device\n");
132 return ret;
133 }
134
135 pr_info("Toshiba WMI Hotkey Driver\n");
136
137 return 0;
138 }
139
toshiba_wmi_exit(void)140 static void __exit toshiba_wmi_exit(void)
141 {
142 if (wmi_has_guid(WMI_EVENT_GUID))
143 toshiba_wmi_input_destroy();
144 }
145
146 module_init(toshiba_wmi_init);
147 module_exit(toshiba_wmi_exit);
148
