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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 | ||
5cab0098 ML |
49 | enum { KE_KEY, KE_SW, KE_IGNORE, KE_END }; |
50 | ||
51 | /* | |
52 | * Certain keys are flagged as KE_IGNORE. All of these are either | |
53 | * notifications (rather than requests for change) or are also sent | |
54 | * via the keyboard controller so should not be sent again. | |
55 | */ | |
0b3f6109 MG |
56 | |
57 | static struct key_entry dell_wmi_keymap[] = { | |
58 | {KE_KEY, 0xe045, KEY_PROG1}, | |
5cab0098 ML |
59 | {KE_KEY, 0xe009, KEY_EJECTCD}, |
60 | ||
61 | /* These also contain the brightness level at offset 6 */ | |
62 | {KE_KEY, 0xe006, KEY_BRIGHTNESSUP}, | |
63 | {KE_KEY, 0xe005, KEY_BRIGHTNESSDOWN}, | |
64 | ||
65 | /* Battery health status button */ | |
66 | {KE_KEY, 0xe007, KEY_BATTERY}, | |
67 | ||
68 | /* This is actually for all radios. Although physically a | |
69 | * switch, the notification does not provide an indication of | |
70 | * state and so it should be reported as a key */ | |
71 | {KE_KEY, 0xe008, KEY_WLAN}, | |
72 | ||
73 | /* The next device is at offset 6, the active devices are at | |
74 | offset 8 and the attached devices at offset 10 */ | |
75 | {KE_KEY, 0xe00b, KEY_DISPLAYTOGGLE}, | |
76 | ||
77 | {KE_IGNORE, 0xe00c, KEY_KBDILLUMTOGGLE}, | |
78 | ||
79 | /* BIOS error detected */ | |
80 | {KE_IGNORE, 0xe00d, KEY_RESERVED}, | |
81 | ||
82 | /* Wifi Catcher */ | |
83 | {KE_KEY, 0xe011, KEY_PROG2}, | |
84 | ||
85 | /* Ambient light sensor toggle */ | |
86 | {KE_IGNORE, 0xe013, KEY_RESERVED}, | |
87 | ||
88 | {KE_IGNORE, 0xe020, KEY_MUTE}, | |
89 | {KE_IGNORE, 0xe02e, KEY_VOLUMEDOWN}, | |
90 | {KE_IGNORE, 0xe030, KEY_VOLUMEUP}, | |
91 | {KE_IGNORE, 0xe033, KEY_KBDILLUMUP}, | |
92 | {KE_IGNORE, 0xe034, KEY_KBDILLUMDOWN}, | |
93 | {KE_IGNORE, 0xe03a, KEY_CAPSLOCK}, | |
94 | {KE_IGNORE, 0xe045, KEY_NUMLOCK}, | |
95 | {KE_IGNORE, 0xe046, KEY_SCROLLLOCK}, | |
0b3f6109 MG |
96 | {KE_END, 0} |
97 | }; | |
98 | ||
99 | static struct input_dev *dell_wmi_input_dev; | |
100 | ||
101 | static struct key_entry *dell_wmi_get_entry_by_scancode(int code) | |
102 | { | |
103 | struct key_entry *key; | |
104 | ||
105 | for (key = dell_wmi_keymap; key->type != KE_END; key++) | |
106 | if (code == key->code) | |
107 | return key; | |
108 | ||
109 | return NULL; | |
110 | } | |
111 | ||
112 | static struct key_entry *dell_wmi_get_entry_by_keycode(int keycode) | |
113 | { | |
114 | struct key_entry *key; | |
115 | ||
116 | for (key = dell_wmi_keymap; key->type != KE_END; key++) | |
117 | if (key->type == KE_KEY && keycode == key->keycode) | |
118 | return key; | |
119 | ||
120 | return NULL; | |
121 | } | |
122 | ||
123 | static int dell_wmi_getkeycode(struct input_dev *dev, int scancode, | |
124 | int *keycode) | |
125 | { | |
126 | struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode); | |
127 | ||
128 | if (key && key->type == KE_KEY) { | |
129 | *keycode = key->keycode; | |
130 | return 0; | |
131 | } | |
132 | ||
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | static int dell_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode) | |
137 | { | |
138 | struct key_entry *key; | |
139 | int old_keycode; | |
140 | ||
141 | if (keycode < 0 || keycode > KEY_MAX) | |
142 | return -EINVAL; | |
143 | ||
144 | key = dell_wmi_get_entry_by_scancode(scancode); | |
145 | if (key && key->type == KE_KEY) { | |
146 | old_keycode = key->keycode; | |
147 | key->keycode = keycode; | |
148 | set_bit(keycode, dev->keybit); | |
149 | if (!dell_wmi_get_entry_by_keycode(old_keycode)) | |
150 | clear_bit(old_keycode, dev->keybit); | |
151 | return 0; | |
152 | } | |
153 | return -EINVAL; | |
154 | } | |
155 | ||
156 | static void dell_wmi_notify(u32 value, void *context) | |
157 | { | |
158 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
159 | static struct key_entry *key; | |
160 | union acpi_object *obj; | |
161 | ||
162 | wmi_get_event_data(value, &response); | |
163 | ||
164 | obj = (union acpi_object *)response.pointer; | |
165 | ||
166 | if (obj && obj->type == ACPI_TYPE_BUFFER) { | |
167 | int *buffer = (int *)obj->buffer.pointer; | |
75d71c40 ML |
168 | /* |
169 | * The upper bytes of the event may contain | |
170 | * additional information, so mask them off for the | |
171 | * scancode lookup | |
172 | */ | |
173 | key = dell_wmi_get_entry_by_scancode(buffer[1] & 0xFFFF); | |
0b3f6109 MG |
174 | if (key) { |
175 | input_report_key(dell_wmi_input_dev, key->keycode, 1); | |
176 | input_sync(dell_wmi_input_dev); | |
177 | input_report_key(dell_wmi_input_dev, key->keycode, 0); | |
178 | input_sync(dell_wmi_input_dev); | |
179 | } else | |
180 | printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n", | |
181 | buffer[1]); | |
182 | } | |
183 | } | |
184 | ||
185 | static int __init dell_wmi_input_setup(void) | |
186 | { | |
187 | struct key_entry *key; | |
188 | int err; | |
189 | ||
190 | dell_wmi_input_dev = input_allocate_device(); | |
191 | ||
192 | if (!dell_wmi_input_dev) | |
193 | return -ENOMEM; | |
194 | ||
195 | dell_wmi_input_dev->name = "Dell WMI hotkeys"; | |
196 | dell_wmi_input_dev->phys = "wmi/input0"; | |
197 | dell_wmi_input_dev->id.bustype = BUS_HOST; | |
198 | dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode; | |
199 | dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode; | |
200 | ||
201 | for (key = dell_wmi_keymap; key->type != KE_END; key++) { | |
202 | switch (key->type) { | |
203 | case KE_KEY: | |
204 | set_bit(EV_KEY, dell_wmi_input_dev->evbit); | |
205 | set_bit(key->keycode, dell_wmi_input_dev->keybit); | |
206 | break; | |
207 | case KE_SW: | |
208 | set_bit(EV_SW, dell_wmi_input_dev->evbit); | |
209 | set_bit(key->keycode, dell_wmi_input_dev->swbit); | |
210 | break; | |
211 | } | |
212 | } | |
213 | ||
214 | err = input_register_device(dell_wmi_input_dev); | |
215 | ||
216 | if (err) { | |
217 | input_free_device(dell_wmi_input_dev); | |
218 | return err; | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static int __init dell_wmi_init(void) | |
225 | { | |
226 | int err; | |
227 | ||
228 | if (wmi_has_guid(DELL_EVENT_GUID)) { | |
229 | err = dell_wmi_input_setup(); | |
230 | ||
231 | if (err) | |
232 | return err; | |
233 | ||
234 | err = wmi_install_notify_handler(DELL_EVENT_GUID, | |
235 | dell_wmi_notify, NULL); | |
236 | if (err) { | |
237 | input_unregister_device(dell_wmi_input_dev); | |
238 | printk(KERN_ERR "dell-wmi: Unable to register" | |
239 | " notify handler - %d\n", err); | |
240 | return err; | |
241 | } | |
242 | ||
243 | } else | |
244 | printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n"); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | static void __exit dell_wmi_exit(void) | |
250 | { | |
251 | if (wmi_has_guid(DELL_EVENT_GUID)) { | |
252 | wmi_remove_notify_handler(DELL_EVENT_GUID); | |
253 | input_unregister_device(dell_wmi_input_dev); | |
254 | } | |
255 | } | |
256 | ||
257 | module_init(dell_wmi_init); | |
258 | module_exit(dell_wmi_exit); |