drivers/platform/x86/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/slab.h>
  30 #include <linux/types.h>
  31 #include <linux/input.h>
  32 #include <acpi/acpi_drivers.h>
  33 #include <linux/acpi.h>
  34 #include <linux/string.h>
  35 #include <linux/dmi.h>
  36
  37 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
  38 MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
  39 MODULE_LICENSE("GPL");
  40
  41 #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
  42
  43 static int acpi_video;
  44
  45 MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
  46
  47 struct key_entry {
  48         char type;              /* See KE_* below */
  49         u16 code;
  50         u16 keycode;
  51 };
  52
  53 enum { KE_KEY, KE_SW, KE_IGNORE, KE_END };
  54
  55 /*
  56  * Certain keys are flagged as KE_IGNORE. All of these are either
  57  * notifications (rather than requests for change) or are also sent
  58  * via the keyboard controller so should not be sent again.
  59  */
  60
  61 static struct key_entry dell_legacy_wmi_keymap[] = {
  62         {KE_KEY, 0xe045, KEY_PROG1},
  63         {KE_KEY, 0xe009, KEY_EJECTCD},
  64
  65         /* These also contain the brightness level at offset 6 */
  66         {KE_KEY, 0xe006, KEY_BRIGHTNESSUP},
  67         {KE_KEY, 0xe005, KEY_BRIGHTNESSDOWN},
  68
  69         /* Battery health status button */
  70         {KE_KEY, 0xe007, KEY_BATTERY},
  71
  72         /* This is actually for all radios. Although physically a
  73          * switch, the notification does not provide an indication of
  74          * state and so it should be reported as a key */
  75         {KE_KEY, 0xe008, KEY_WLAN},
  76
  77         /* The next device is at offset 6, the active devices are at
  78            offset 8 and the attached devices at offset 10 */
  79         {KE_KEY, 0xe00b, KEY_SWITCHVIDEOMODE},
  80
  81         {KE_IGNORE, 0xe00c, KEY_KBDILLUMTOGGLE},
  82
  83         /* BIOS error detected */
  84         {KE_IGNORE, 0xe00d, KEY_RESERVED},
  85
  86         /* Wifi Catcher */
  87         {KE_KEY, 0xe011, KEY_PROG2},
  88
  89         /* Ambient light sensor toggle */
  90         {KE_IGNORE, 0xe013, KEY_RESERVED},
  91
  92         {KE_IGNORE, 0xe020, KEY_MUTE},
  93         {KE_IGNORE, 0xe02e, KEY_VOLUMEDOWN},
  94         {KE_IGNORE, 0xe030, KEY_VOLUMEUP},
  95         {KE_IGNORE, 0xe033, KEY_KBDILLUMUP},
  96         {KE_IGNORE, 0xe034, KEY_KBDILLUMDOWN},
  97         {KE_IGNORE, 0xe03a, KEY_CAPSLOCK},
  98         {KE_IGNORE, 0xe045, KEY_NUMLOCK},
  99         {KE_IGNORE, 0xe046, KEY_SCROLLLOCK},
 100         {KE_END, 0}
 101 };
 102
 103 static bool dell_new_hk_type;
 104
 105 struct dell_new_keymap_entry {
 106         u16 scancode;
 107         u16 keycode;
 108 };
 109
 110 struct dell_hotkey_table {
 111         struct dmi_header header;
 112         struct dell_new_keymap_entry keymap[];
 113
 114 };
 115
 116 static struct key_entry *dell_new_wmi_keymap;
 117
 118 static u16 bios_to_linux_keycode[256] = {
 119
 120         KEY_MEDIA,      KEY_NEXTSONG,   KEY_PLAYPAUSE, KEY_PREVIOUSSONG,
 121         KEY_STOPCD,     KEY_UNKNOWN,    KEY_UNKNOWN,    KEY_UNKNOWN,
 122         KEY_WWW,        KEY_UNKNOWN,    KEY_VOLUMEDOWN, KEY_MUTE,
 123         KEY_VOLUMEUP,   KEY_UNKNOWN,    KEY_BATTERY,    KEY_EJECTCD,
 124         KEY_UNKNOWN,    KEY_SLEEP,      KEY_PROG1, KEY_BRIGHTNESSDOWN,
 125         KEY_BRIGHTNESSUP,       KEY_UNKNOWN,    KEY_KBDILLUMTOGGLE,
 126         KEY_UNKNOWN,    KEY_SWITCHVIDEOMODE,    KEY_UNKNOWN, KEY_UNKNOWN,
 127         KEY_SWITCHVIDEOMODE,    KEY_UNKNOWN,    KEY_UNKNOWN, KEY_PROG2,
 128         KEY_UNKNOWN, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 129         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 130         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 131         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 132         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 133         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 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,
 138         KEY_PROG3
 139 };
 140
 141
 142 static struct key_entry *dell_wmi_keymap = dell_legacy_wmi_keymap;
 143
 144 static struct input_dev *dell_wmi_input_dev;
 145
 146 static struct key_entry *dell_wmi_get_entry_by_scancode(unsigned int code)
 147 {
 148         struct key_entry *key;
 149
 150         for (key = dell_wmi_keymap; key->type != KE_END; key++)
 151                 if (code == key->code)
 152                         return key;
 153
 154         return NULL;
 155 }
 156
 157 static struct key_entry *dell_wmi_get_entry_by_keycode(unsigned int keycode)
 158 {
 159         struct key_entry *key;
 160
 161         for (key = dell_wmi_keymap; key->type != KE_END; key++)
 162                 if (key->type == KE_KEY && keycode == key->keycode)
 163                         return key;
 164
 165         return NULL;
 166 }
 167
 168 static int dell_wmi_getkeycode(struct input_dev *dev,
 169                                 unsigned int scancode, unsigned int *keycode)
 170 {
 171         struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
 172
 173         if (key && key->type == KE_KEY) {
 174                 *keycode = key->keycode;
 175                 return 0;
 176         }
 177
 178         return -EINVAL;
 179 }
 180
 181 static int dell_wmi_setkeycode(struct input_dev *dev,
 182                                 unsigned int scancode, unsigned int keycode)
 183 {
 184         struct key_entry *key;
 185         unsigned int old_keycode;
 186
 187         key = dell_wmi_get_entry_by_scancode(scancode);
 188         if (key && key->type == KE_KEY) {
 189                 old_keycode = key->keycode;
 190                 key->keycode = keycode;
 191                 set_bit(keycode, dev->keybit);
 192                 if (!dell_wmi_get_entry_by_keycode(old_keycode))
 193                         clear_bit(old_keycode, dev->keybit);
 194                 return 0;
 195         }
 196         return -EINVAL;
 197 }
 198
 199 static void dell_wmi_notify(u32 value, void *context)
 200 {
 201         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 202         static struct key_entry *key;
 203         union acpi_object *obj;
 204         acpi_status status;
 205
 206         status = wmi_get_event_data(value, &response);
 207         if (status != AE_OK) {
 208                 printk(KERN_INFO "dell-wmi: bad event status 0x%x\n", status);
 209                 return;
 210         }
 211
 212         obj = (union acpi_object *)response.pointer;
 213
 214         if (obj && obj->type == ACPI_TYPE_BUFFER) {
 215                 int reported_key;
 216                 u16 *buffer_entry = (u16 *)obj->buffer.pointer;
 217                 if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
 218                         printk(KERN_INFO "dell-wmi: Received unknown WMI event"
 219                                          " (0x%x)\n", buffer_entry[1]);
 220                         kfree(obj);
 221                         return;
 222                 }
 223
 224                 if (dell_new_hk_type)
 225                         reported_key = (int)buffer_entry[2];
 226                 else
 227                         reported_key = (int)buffer_entry[1] & 0xffff;
 228
 229                 key = dell_wmi_get_entry_by_scancode(reported_key);
 230
 231                 if (!key) {
 232                         printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
 233                                 reported_key);
 234                 } else if ((key->keycode == KEY_BRIGHTNESSUP ||
 235                             key->keycode == KEY_BRIGHTNESSDOWN) && acpi_video) {
 236                         /* Don't report brightness notifications that will also
 237                          * come via ACPI */
 238                         ;
 239                 } else {
 240                         input_report_key(dell_wmi_input_dev, key->keycode, 1);
 241                         input_sync(dell_wmi_input_dev);
 242                         input_report_key(dell_wmi_input_dev, key->keycode, 0);
 243                         input_sync(dell_wmi_input_dev);
 244                 }
 245         }
 246         kfree(obj);
 247 }
 248
 249
 250 static void setup_new_hk_map(const struct dmi_header *dm)
 251 {
 252
 253         int i;
 254         int hotkey_num = (dm->length-4)/sizeof(struct dell_new_keymap_entry);
 255         struct dell_hotkey_table *table =
 256                 container_of(dm, struct dell_hotkey_table, header);
 257
 258         dell_new_wmi_keymap = kzalloc((hotkey_num+1) *
 259                                       sizeof(struct key_entry), GFP_KERNEL);
 260
 261         for (i = 0; i < hotkey_num; i++) {
 262                 dell_new_wmi_keymap[i].type = KE_KEY;
 263                 dell_new_wmi_keymap[i].code = table->keymap[i].scancode;
 264                 dell_new_wmi_keymap[i].keycode =
 265                         (table->keymap[i].keycode > 255) ? 0 :
 266                         bios_to_linux_keycode[table->keymap[i].keycode];
 267         }
 268
 269         dell_new_wmi_keymap[i].type = KE_END;
 270         dell_new_wmi_keymap[i].code = 0;
 271         dell_new_wmi_keymap[i].keycode = 0;
 272
 273         dell_wmi_keymap = dell_new_wmi_keymap;
 274
 275 }
 276
 277
 278 static void find_hk_type(const struct dmi_header *dm, void *dummy)
 279 {
 280
 281         if ((dm->type == 0xb2) && (dm->length > 6)) {
 282                 dell_new_hk_type = true;
 283                 setup_new_hk_map(dm);
 284         }
 285
 286 }
 287
 288
 289 static int __init dell_wmi_input_setup(void)
 290 {
 291         struct key_entry *key;
 292         int err;
 293
 294         dell_wmi_input_dev = input_allocate_device();
 295
 296         if (!dell_wmi_input_dev)
 297                 return -ENOMEM;
 298
 299         dell_wmi_input_dev->name = "Dell WMI hotkeys";
 300         dell_wmi_input_dev->phys = "wmi/input0";
 301         dell_wmi_input_dev->id.bustype = BUS_HOST;
 302         dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode;
 303         dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode;
 304
 305         for (key = dell_wmi_keymap; key->type != KE_END; key++) {
 306                 switch (key->type) {
 307                 case KE_KEY:
 308                         set_bit(EV_KEY, dell_wmi_input_dev->evbit);
 309                         set_bit(key->keycode, dell_wmi_input_dev->keybit);
 310                         break;
 311                 case KE_SW:
 312                         set_bit(EV_SW, dell_wmi_input_dev->evbit);
 313                         set_bit(key->keycode, dell_wmi_input_dev->swbit);
 314                         break;
 315                 }
 316         }
 317
 318         err = input_register_device(dell_wmi_input_dev);
 319
 320         if (err) {
 321                 input_free_device(dell_wmi_input_dev);
 322                 return err;
 323         }
 324
 325         return 0;
 326 }
 327
 328 static int __init dell_wmi_init(void)
 329 {
 330         int err;
 331         acpi_status status;
 332
 333         if (!wmi_has_guid(DELL_EVENT_GUID)) {
 334                 printk(KERN_WARNING "dell-wmi: No known WMI GUID found\n");
 335                 return -ENODEV;
 336         }
 337
 338         dmi_walk(find_hk_type, NULL);
 339         acpi_video = acpi_video_backlight_support();
 340
 341         err = dell_wmi_input_setup();
 342         if (err)
 343                 return err;
 344
 345         status = wmi_install_notify_handler(DELL_EVENT_GUID,
 346                                          dell_wmi_notify, NULL);
 347         if (ACPI_FAILURE(status)) {
 348                 input_unregister_device(dell_wmi_input_dev);
 349                 printk(KERN_ERR
 350                         "dell-wmi: Unable to register notify handler - %d\n",
 351                         status);
 352                 return -ENODEV;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static void __exit dell_wmi_exit(void)
 359 {
 360         wmi_remove_notify_handler(DELL_EVENT_GUID);
 361         input_unregister_device(dell_wmi_input_dev);
 362 }
 363
 364 module_init(dell_wmi_init);
 365 module_exit(dell_wmi_exit);