x86: Fix iommu=nodac parameter handling
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / platform / x86 / dell-wmi.c
blob0f900cc9fa7a5131283c14b2aae8e11d7667b949
1 /*
2 * Dell WMI hotkeys
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 #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>
35 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
36 MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
37 MODULE_LICENSE("GPL");
39 #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
41 MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
43 struct key_entry {
44 char type; /* See KE_* below */
45 u16 code;
46 u16 keycode;
49 enum { KE_KEY, KE_SW, KE_IGNORE, KE_END };
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.
57 static struct key_entry dell_wmi_keymap[] = {
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_DISPLAYTOGGLE},
77 {KE_IGNORE, 0xe00c, KEY_KBDILLUMTOGGLE},
79 /* BIOS error detected */
80 {KE_IGNORE, 0xe00d, KEY_RESERVED},
82 /* Wifi Catcher */
83 {KE_KEY, 0xe011, KEY_PROG2},
85 /* Ambient light sensor toggle */
86 {KE_IGNORE, 0xe013, KEY_RESERVED},
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},
96 {KE_END, 0}
99 static struct input_dev *dell_wmi_input_dev;
101 static struct key_entry *dell_wmi_get_entry_by_scancode(int code)
103 struct key_entry *key;
105 for (key = dell_wmi_keymap; key->type != KE_END; key++)
106 if (code == key->code)
107 return key;
109 return NULL;
112 static struct key_entry *dell_wmi_get_entry_by_keycode(int keycode)
114 struct key_entry *key;
116 for (key = dell_wmi_keymap; key->type != KE_END; key++)
117 if (key->type == KE_KEY && keycode == key->keycode)
118 return key;
120 return NULL;
123 static int dell_wmi_getkeycode(struct input_dev *dev, int scancode,
124 int *keycode)
126 struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
128 if (key && key->type == KE_KEY) {
129 *keycode = key->keycode;
130 return 0;
133 return -EINVAL;
136 static int dell_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
138 struct key_entry *key;
139 int old_keycode;
141 if (keycode < 0 || keycode > KEY_MAX)
142 return -EINVAL;
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;
153 return -EINVAL;
156 static void dell_wmi_notify(u32 value, void *context)
158 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
159 static struct key_entry *key;
160 union acpi_object *obj;
162 wmi_get_event_data(value, &response);
164 obj = (union acpi_object *)response.pointer;
166 if (obj && obj->type == ACPI_TYPE_BUFFER) {
167 int *buffer = (int *)obj->buffer.pointer;
169 * The upper bytes of the event may contain
170 * additional information, so mask them off for the
171 * scancode lookup
173 key = dell_wmi_get_entry_by_scancode(buffer[1] & 0xFFFF);
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 if (buffer[1] & 0xFFFF)
180 printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
181 buffer[1] & 0xFFFF);
185 static int __init dell_wmi_input_setup(void)
187 struct key_entry *key;
188 int err;
190 dell_wmi_input_dev = input_allocate_device();
192 if (!dell_wmi_input_dev)
193 return -ENOMEM;
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;
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;
214 err = input_register_device(dell_wmi_input_dev);
216 if (err) {
217 input_free_device(dell_wmi_input_dev);
218 return err;
221 return 0;
224 static int __init dell_wmi_init(void)
226 int err;
228 if (wmi_has_guid(DELL_EVENT_GUID)) {
229 err = dell_wmi_input_setup();
231 if (err)
232 return err;
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;
243 } else
244 printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n");
246 return 0;
249 static void __exit dell_wmi_exit(void)
251 if (wmi_has_guid(DELL_EVENT_GUID)) {
252 wmi_remove_notify_handler(DELL_EVENT_GUID);
253 input_unregister_device(dell_wmi_input_dev);
257 module_init(dell_wmi_init);
258 module_exit(dell_wmi_exit);