dell-wmi.c

  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_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  */
 56 
 57 static struct key_entry dell_wmi_keymap[] = {
 58         {KE_KEY, 0xe045, KEY_PROG1},
 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},
 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;
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);
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);
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);
259
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