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0b3f6109 MG |
1 | /* |
2 | * Dell WMI hotkeys | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat <mjg@redhat.com> | |
5 | * | |
6 | * Portions based on wistron_btns.c: | |
7 | * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz> | |
8 | * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org> | |
9 | * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/input.h> | |
31 | #include <acpi/acpi_drivers.h> | |
32 | #include <linux/acpi.h> | |
33 | #include <linux/string.h> | |
34 | ||
35 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); | |
36 | MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver"); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
39 | #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492" | |
40 | ||
41 | MODULE_ALIAS("wmi:"DELL_EVENT_GUID); | |
42 | ||
43 | struct key_entry { | |
44 | char type; /* See KE_* below */ | |
45 | u16 code; | |
46 | u16 keycode; | |
47 | }; | |
48 | ||
49 | enum { KE_KEY, KE_SW, KE_END }; | |
50 | ||
51 | static struct key_entry dell_wmi_keymap[] = { | |
52 | {KE_KEY, 0xe045, KEY_PROG1}, | |
53 | {KE_END, 0} | |
54 | }; | |
55 | ||
56 | static struct input_dev *dell_wmi_input_dev; | |
57 | ||
58 | static struct key_entry *dell_wmi_get_entry_by_scancode(int code) | |
59 | { | |
60 | struct key_entry *key; | |
61 | ||
62 | for (key = dell_wmi_keymap; key->type != KE_END; key++) | |
63 | if (code == key->code) | |
64 | return key; | |
65 | ||
66 | return NULL; | |
67 | } | |
68 | ||
69 | static struct key_entry *dell_wmi_get_entry_by_keycode(int keycode) | |
70 | { | |
71 | struct key_entry *key; | |
72 | ||
73 | for (key = dell_wmi_keymap; key->type != KE_END; key++) | |
74 | if (key->type == KE_KEY && keycode == key->keycode) | |
75 | return key; | |
76 | ||
77 | return NULL; | |
78 | } | |
79 | ||
80 | static int dell_wmi_getkeycode(struct input_dev *dev, int scancode, | |
81 | int *keycode) | |
82 | { | |
83 | struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode); | |
84 | ||
85 | if (key && key->type == KE_KEY) { | |
86 | *keycode = key->keycode; | |
87 | return 0; | |
88 | } | |
89 | ||
90 | return -EINVAL; | |
91 | } | |
92 | ||
93 | static int dell_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode) | |
94 | { | |
95 | struct key_entry *key; | |
96 | int old_keycode; | |
97 | ||
98 | if (keycode < 0 || keycode > KEY_MAX) | |
99 | return -EINVAL; | |
100 | ||
101 | key = dell_wmi_get_entry_by_scancode(scancode); | |
102 | if (key && key->type == KE_KEY) { | |
103 | old_keycode = key->keycode; | |
104 | key->keycode = keycode; | |
105 | set_bit(keycode, dev->keybit); | |
106 | if (!dell_wmi_get_entry_by_keycode(old_keycode)) | |
107 | clear_bit(old_keycode, dev->keybit); | |
108 | return 0; | |
109 | } | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
113 | static void dell_wmi_notify(u32 value, void *context) | |
114 | { | |
115 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
116 | static struct key_entry *key; | |
117 | union acpi_object *obj; | |
118 | ||
119 | wmi_get_event_data(value, &response); | |
120 | ||
121 | obj = (union acpi_object *)response.pointer; | |
122 | ||
123 | if (obj && obj->type == ACPI_TYPE_BUFFER) { | |
124 | int *buffer = (int *)obj->buffer.pointer; | |
125 | key = dell_wmi_get_entry_by_scancode(buffer[1]); | |
126 | if (key) { | |
127 | input_report_key(dell_wmi_input_dev, key->keycode, 1); | |
128 | input_sync(dell_wmi_input_dev); | |
129 | input_report_key(dell_wmi_input_dev, key->keycode, 0); | |
130 | input_sync(dell_wmi_input_dev); | |
131 | } else | |
132 | printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n", | |
133 | buffer[1]); | |
134 | } | |
135 | } | |
136 | ||
137 | static int __init dell_wmi_input_setup(void) | |
138 | { | |
139 | struct key_entry *key; | |
140 | int err; | |
141 | ||
142 | dell_wmi_input_dev = input_allocate_device(); | |
143 | ||
144 | if (!dell_wmi_input_dev) | |
145 | return -ENOMEM; | |
146 | ||
147 | dell_wmi_input_dev->name = "Dell WMI hotkeys"; | |
148 | dell_wmi_input_dev->phys = "wmi/input0"; | |
149 | dell_wmi_input_dev->id.bustype = BUS_HOST; | |
150 | dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode; | |
151 | dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode; | |
152 | ||
153 | for (key = dell_wmi_keymap; key->type != KE_END; key++) { | |
154 | switch (key->type) { | |
155 | case KE_KEY: | |
156 | set_bit(EV_KEY, dell_wmi_input_dev->evbit); | |
157 | set_bit(key->keycode, dell_wmi_input_dev->keybit); | |
158 | break; | |
159 | case KE_SW: | |
160 | set_bit(EV_SW, dell_wmi_input_dev->evbit); | |
161 | set_bit(key->keycode, dell_wmi_input_dev->swbit); | |
162 | break; | |
163 | } | |
164 | } | |
165 | ||
166 | err = input_register_device(dell_wmi_input_dev); | |
167 | ||
168 | if (err) { | |
169 | input_free_device(dell_wmi_input_dev); | |
170 | return err; | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static int __init dell_wmi_init(void) | |
177 | { | |
178 | int err; | |
179 | ||
180 | if (wmi_has_guid(DELL_EVENT_GUID)) { | |
181 | err = dell_wmi_input_setup(); | |
182 | ||
183 | if (err) | |
184 | return err; | |
185 | ||
186 | err = wmi_install_notify_handler(DELL_EVENT_GUID, | |
187 | dell_wmi_notify, NULL); | |
188 | if (err) { | |
189 | input_unregister_device(dell_wmi_input_dev); | |
190 | printk(KERN_ERR "dell-wmi: Unable to register" | |
191 | " notify handler - %d\n", err); | |
192 | return err; | |
193 | } | |
194 | ||
195 | } else | |
196 | printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n"); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static void __exit dell_wmi_exit(void) | |
202 | { | |
203 | if (wmi_has_guid(DELL_EVENT_GUID)) { | |
204 | wmi_remove_notify_handler(DELL_EVENT_GUID); | |
205 | input_unregister_device(dell_wmi_input_dev); | |
206 | } | |
207 | } | |
208 | ||
209 | module_init(dell_wmi_init); | |
210 | module_exit(dell_wmi_exit); |