4 * Copyright (C) 2008 Red Hat <mjg@redhat.com>
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>
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.
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.
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
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/input.h>
34 #include <linux/input/sparse-keymap.h>
35 #include <linux/acpi.h>
36 #include <linux/string.h>
37 #include <linux/dmi.h>
39 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
40 MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
41 MODULE_LICENSE("GPL");
43 #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
45 static int acpi_video;
47 MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
50 * Certain keys are flagged as KE_IGNORE. All of these are either
51 * notifications (rather than requests for change) or are also sent
52 * via the keyboard controller so should not be sent again.
55 static const struct key_entry dell_wmi_legacy_keymap[] __initconst = {
56 { KE_IGNORE, 0x003a, { KEY_CAPSLOCK } },
58 { KE_KEY, 0xe045, { KEY_PROG1 } },
59 { KE_KEY, 0xe009, { KEY_EJECTCD } },
61 /* These also contain the brightness level at offset 6 */
62 { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
63 { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },
65 /* Battery health status button */
66 { KE_KEY, 0xe007, { KEY_BATTERY } },
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 } },
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_SWITCHVIDEOMODE } },
77 { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },
79 /* BIOS error detected */
80 { KE_IGNORE, 0xe00d, { KEY_RESERVED } },
83 { KE_KEY, 0xe011, {KEY_PROG2 } },
85 /* Ambient light sensor toggle */
86 { KE_IGNORE, 0xe013, { KEY_RESERVED } },
88 { KE_IGNORE, 0xe020, { KEY_MUTE } },
90 /* Shortcut and audio panel keys */
91 { KE_IGNORE, 0xe025, { KEY_RESERVED } },
92 { KE_IGNORE, 0xe026, { KEY_RESERVED } },
94 { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },
95 { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },
96 { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
97 { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
98 { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
99 { KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
100 { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
101 { KE_IGNORE, 0xe0f7, { KEY_MUTE } },
102 { KE_IGNORE, 0xe0f8, { KEY_VOLUMEDOWN } },
103 { KE_IGNORE, 0xe0f9, { KEY_VOLUMEUP } },
107 static bool dell_new_hk_type;
109 struct dell_bios_keymap_entry {
114 struct dell_bios_hotkey_table {
115 struct dmi_header header;
116 struct dell_bios_keymap_entry keymap[];
120 static const struct dell_bios_hotkey_table *dell_bios_hotkey_table;
122 static const u16 bios_to_linux_keycode[256] __initconst = {
124 KEY_MEDIA, KEY_NEXTSONG, KEY_PLAYPAUSE, KEY_PREVIOUSSONG,
125 KEY_STOPCD, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
126 KEY_WWW, KEY_UNKNOWN, KEY_VOLUMEDOWN, KEY_MUTE,
127 KEY_VOLUMEUP, KEY_UNKNOWN, KEY_BATTERY, KEY_EJECTCD,
128 KEY_UNKNOWN, KEY_SLEEP, KEY_PROG1, KEY_BRIGHTNESSDOWN,
129 KEY_BRIGHTNESSUP, KEY_UNKNOWN, KEY_KBDILLUMTOGGLE,
130 KEY_UNKNOWN, KEY_SWITCHVIDEOMODE, KEY_UNKNOWN, KEY_UNKNOWN,
131 KEY_SWITCHVIDEOMODE, KEY_UNKNOWN, KEY_UNKNOWN, KEY_PROG2,
132 KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
133 KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN, KEY_MICMUTE,
134 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
135 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
136 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
137 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
138 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
139 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
140 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
141 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
142 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
143 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_PROG3
146 static struct input_dev *dell_wmi_input_dev;
148 static void dell_wmi_notify(u32 value, void *context)
150 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
151 union acpi_object *obj;
154 status = wmi_get_event_data(value, &response);
155 if (status != AE_OK) {
156 pr_info("bad event status 0x%x\n", status);
160 obj = (union acpi_object *)response.pointer;
162 if (obj && obj->type == ACPI_TYPE_BUFFER) {
163 const struct key_entry *key;
165 u16 *buffer_entry = (u16 *)obj->buffer.pointer;
167 if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
168 pr_info("Received unknown WMI event (0x%x)\n",
174 if (dell_new_hk_type || buffer_entry[1] == 0x0)
175 reported_key = (int)buffer_entry[2];
177 reported_key = (int)buffer_entry[1] & 0xffff;
179 key = sparse_keymap_entry_from_scancode(dell_wmi_input_dev,
182 pr_info("Unknown key %x pressed\n", reported_key);
183 } else if ((key->keycode == KEY_BRIGHTNESSUP ||
184 key->keycode == KEY_BRIGHTNESSDOWN) && acpi_video) {
185 /* Don't report brightness notifications that will also
189 sparse_keymap_report_entry(dell_wmi_input_dev, key,
196 static const struct key_entry * __init dell_wmi_prepare_new_keymap(void)
198 int hotkey_num = (dell_bios_hotkey_table->header.length - 4) /
199 sizeof(struct dell_bios_keymap_entry);
200 struct key_entry *keymap;
203 keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL);
207 for (i = 0; i < hotkey_num; i++) {
208 const struct dell_bios_keymap_entry *bios_entry =
209 &dell_bios_hotkey_table->keymap[i];
210 keymap[i].type = KE_KEY;
211 keymap[i].code = bios_entry->scancode;
212 keymap[i].keycode = bios_entry->keycode < 256 ?
213 bios_to_linux_keycode[bios_entry->keycode] :
217 keymap[hotkey_num].type = KE_END;
222 static int __init dell_wmi_input_setup(void)
226 dell_wmi_input_dev = input_allocate_device();
227 if (!dell_wmi_input_dev)
230 dell_wmi_input_dev->name = "Dell WMI hotkeys";
231 dell_wmi_input_dev->phys = "wmi/input0";
232 dell_wmi_input_dev->id.bustype = BUS_HOST;
234 if (dell_new_hk_type) {
235 const struct key_entry *keymap = dell_wmi_prepare_new_keymap();
241 err = sparse_keymap_setup(dell_wmi_input_dev, keymap, NULL);
244 * Sparse keymap library makes a copy of keymap so we
245 * don't need the original one that was allocated.
249 err = sparse_keymap_setup(dell_wmi_input_dev,
250 dell_wmi_legacy_keymap, NULL);
255 err = input_register_device(dell_wmi_input_dev);
257 goto err_free_keymap;
262 sparse_keymap_free(dell_wmi_input_dev);
264 input_free_device(dell_wmi_input_dev);
268 static void dell_wmi_input_destroy(void)
270 sparse_keymap_free(dell_wmi_input_dev);
271 input_unregister_device(dell_wmi_input_dev);
274 static void __init find_hk_type(const struct dmi_header *dm, void *dummy)
276 if (dm->type == 0xb2 && dm->length > 6) {
277 dell_new_hk_type = true;
278 dell_bios_hotkey_table =
279 container_of(dm, struct dell_bios_hotkey_table, header);
283 static int __init dell_wmi_init(void)
288 if (!wmi_has_guid(DELL_EVENT_GUID)) {
289 pr_warn("No known WMI GUID found\n");
293 dmi_walk(find_hk_type, NULL);
294 acpi_video = acpi_video_backlight_support();
296 err = dell_wmi_input_setup();
300 status = wmi_install_notify_handler(DELL_EVENT_GUID,
301 dell_wmi_notify, NULL);
302 if (ACPI_FAILURE(status)) {
303 dell_wmi_input_destroy();
304 pr_err("Unable to register notify handler - %d\n", status);
310 module_init(dell_wmi_init);
312 static void __exit dell_wmi_exit(void)
314 wmi_remove_notify_handler(DELL_EVENT_GUID);
315 dell_wmi_input_destroy();
317 module_exit(dell_wmi_exit);