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/types.h>
  30 #include <linux/input.h>
  31 #include <acpi/acpi_drivers.h>
  32 #include <linux/acpi.h>
  33 #include <linux/string.h>
  34 #include <linux/dmi.h>
  35
  36 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
  37 MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
  38 MODULE_LICENSE("GPL");
  39
  40 #define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
  41
  42 static int acpi_video;
  43
  44 MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
  45
  46 struct key_entry {
  47         char type;              /* See KE_* below */
  48         u16 code;
  49         u16 keycode;
  50 };
  51
  52 enum { KE_KEY, KE_SW, KE_IGNORE, KE_END };
  53
  54 /*
  55  * Certain keys are flagged as KE_IGNORE. All of these are either
  56  * notifications (rather than requests for change) or are also sent
  57  * via the keyboard controller so should not be sent again.
  58  */
  59
  60 static struct key_entry dell_legacy_wmi_keymap[] = {
  61         {KE_KEY, 0xe045, KEY_PROG1},
  62         {KE_KEY, 0xe009, KEY_EJECTCD},
  63
  64         /* These also contain the brightness level at offset 6 */
  65         {KE_KEY, 0xe006, KEY_BRIGHTNESSUP},
  66         {KE_KEY, 0xe005, KEY_BRIGHTNESSDOWN},
  67
  68         /* Battery health status button */
  69         {KE_KEY, 0xe007, KEY_BATTERY},
  70
  71         /* This is actually for all radios. Although physically a
  72          * switch, the notification does not provide an indication of
  73          * state and so it should be reported as a key */
  74         {KE_KEY, 0xe008, KEY_WLAN},
  75
  76         /* The next device is at offset 6, the active devices are at
  77            offset 8 and the attached devices at offset 10 */
  78         {KE_KEY, 0xe00b, KEY_SWITCHVIDEOMODE},
  79
  80         {KE_IGNORE, 0xe00c, KEY_KBDILLUMTOGGLE},
  81
  82         /* BIOS error detected */
  83         {KE_IGNORE, 0xe00d, KEY_RESERVED},
  84
  85         /* Wifi Catcher */
  86         {KE_KEY, 0xe011, KEY_PROG2},
  87
  88         /* Ambient light sensor toggle */
  89         {KE_IGNORE, 0xe013, KEY_RESERVED},
  90
  91         {KE_IGNORE, 0xe020, KEY_MUTE},
  92         {KE_IGNORE, 0xe02e, KEY_VOLUMEDOWN},
  93         {KE_IGNORE, 0xe030, KEY_VOLUMEUP},
  94         {KE_IGNORE, 0xe033, KEY_KBDILLUMUP},
  95         {KE_IGNORE, 0xe034, KEY_KBDILLUMDOWN},
  96         {KE_IGNORE, 0xe03a, KEY_CAPSLOCK},
  97         {KE_IGNORE, 0xe045, KEY_NUMLOCK},
  98         {KE_IGNORE, 0xe046, KEY_SCROLLLOCK},
  99         {KE_END, 0}
 100 };
 101
 102 static bool dell_new_hk_type;
 103
 104 struct dell_new_keymap_entry {
 105         u16 scancode;
 106         u16 keycode;
 107 };
 108
 109 struct dell_hotkey_table {
 110         struct dmi_header header;
 111         struct dell_new_keymap_entry keymap[];
 112
 113 };
 114
 115 static struct key_entry *dell_new_wmi_keymap;
 116
 117 static u16 bios_to_linux_keycode[256] = {
 118
 119         KEY_MEDIA,      KEY_NEXTSONG,   KEY_PLAYPAUSE, KEY_PREVIOUSSONG,
 120         KEY_STOPCD,     KEY_UNKNOWN,    KEY_UNKNOWN,    KEY_UNKNOWN,
 121         KEY_WWW,        KEY_UNKNOWN,    KEY_VOLUMEDOWN, KEY_MUTE,
 122         KEY_VOLUMEUP,   KEY_UNKNOWN,    KEY_BATTERY,    KEY_EJECTCD,
 123         KEY_UNKNOWN,    KEY_SLEEP,      KEY_PROG1, KEY_BRIGHTNESSDOWN,
 124         KEY_BRIGHTNESSUP,       KEY_UNKNOWN,    KEY_KBDILLUMTOGGLE,
 125         KEY_UNKNOWN,    KEY_SWITCHVIDEOMODE,    KEY_UNKNOWN, KEY_UNKNOWN,
 126         KEY_SWITCHVIDEOMODE,    KEY_UNKNOWN,    KEY_UNKNOWN, KEY_PROG2,
 127         KEY_UNKNOWN, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 128         0, 0, 0, 0, 0, 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,
 137         KEY_PROG3
 138 };
 139
 140
 141 static struct key_entry *dell_wmi_keymap = dell_legacy_wmi_keymap;
 142
 143 static struct input_dev *dell_wmi_input_dev;
 144
 145 static struct key_entry *dell_wmi_get_entry_by_scancode(int code)
 146 {
 147         struct key_entry *key;
 148
 149         for (key = dell_wmi_keymap; key->type != KE_END; key++)
 150                 if (code == key->code)
 151                         return key;
 152
 153         return NULL;
 154 }
 155
 156 static struct key_entry *dell_wmi_get_entry_by_keycode(int keycode)
 157 {
 158         struct key_entry *key;
 159
 160         for (key = dell_wmi_keymap; key->type != KE_END; key++)
 161                 if (key->type == KE_KEY && keycode == key->keycode)
 162                         return key;
 163
 164         return NULL;
 165 }
 166
 167 static int dell_wmi_getkeycode(struct input_dev *dev, int scancode,
 168                                int *keycode)
 169 {
 170         struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
 171
 172         if (key && key->type == KE_KEY) {
 173                 *keycode = key->keycode;
 174                 return 0;
 175         }
 176
 177         return -EINVAL;
 178 }
 179
 180 static int dell_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 181 {
 182         struct key_entry *key;
 183         int old_keycode;
 184
 185         if (keycode < 0 || keycode > KEY_MAX)
 186                 return -EINVAL;
 187
 188         key = dell_wmi_get_entry_by_scancode(scancode);
 189         if (key && key->type == KE_KEY) {
 190                 old_keycode = key->keycode;
 191                 key->keycode = keycode;
 192                 set_bit(keycode, dev->keybit);
 193                 if (!dell_wmi_get_entry_by_keycode(old_keycode))
 194                         clear_bit(old_keycode, dev->keybit);
 195                 return 0;
 196         }
 197         return -EINVAL;
 198 }
 199
 200 static void dell_wmi_notify(u32 value, void *context)
 201 {
 202         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 203         static struct key_entry *key;
 204         union acpi_object *obj;
 205         acpi_status status;
 206
 207         status = wmi_get_event_data(value, &response);
 208         if (status != AE_OK) {
 209                 printk(KERN_INFO "dell-wmi: bad event status 0x%x\n", status);
 210                 return;
 211         }
 212
 213         obj = (union acpi_object *)response.pointer;
 214
 215         if (obj && obj->type == ACPI_TYPE_BUFFER) {
 216                 int reported_key;
 217                 u16 *buffer_entry = (u16 *)obj->buffer.pointer;
 218                 if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
 219                         printk(KERN_INFO "dell-wmi: Received unknown WMI event"
 220                                          " (0x%x)\n", buffer_entry[1]);
 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                         return;
 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);