drivers/misc/hp-wmi.c

   1 /*
   2  * HP 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/platform_device.h>
  33 #include <linux/acpi.h>
  34 #include <linux/rfkill.h>
  35 #include <linux/string.h>
  36
  37 MODULE_AUTHOR("Matthew Garrett <mjg59@srcf.ucam.org>");
  38 MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
  39 MODULE_LICENSE("GPL");
  40
  41 MODULE_ALIAS("wmi:95F24279-4D7B-4334-9387-ACCDC67EF61C");
  42 MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
  43
  44 #define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
  45 #define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
  46
  47 #define HPWMI_DISPLAY_QUERY 0x1
  48 #define HPWMI_HDDTEMP_QUERY 0x2
  49 #define HPWMI_ALS_QUERY 0x3
  50 #define HPWMI_DOCK_QUERY 0x4
  51 #define HPWMI_WIRELESS_QUERY 0x5
  52 #define HPWMI_HOTKEY_QUERY 0xc
  53
  54 static int __init hp_wmi_bios_setup(struct platform_device *device);
  55 static int __exit hp_wmi_bios_remove(struct platform_device *device);
  56
  57 struct bios_args {
  58         u32 signature;
  59         u32 command;
  60         u32 commandtype;
  61         u32 datasize;
  62         u32 data;
  63 };
  64
  65 struct bios_return {
  66         u32 sigpass;
  67         u32 return_code;
  68         u32 value;
  69 };
  70
  71 struct key_entry {
  72         char type;              /* See KE_* below */
  73         u16 code;
  74         u16 keycode;
  75 };
  76
  77 enum { KE_KEY, KE_SW, KE_END };
  78
  79 static struct key_entry hp_wmi_keymap[] = {
  80         {KE_SW, 0x01, SW_DOCK},
  81         {KE_KEY, 0x02, KEY_BRIGHTNESSUP},
  82         {KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
  83         {KE_KEY, 0x20e6, KEY_PROG1},
  84         {KE_KEY, 0x2142, KEY_MEDIA},
  85         {KE_KEY, 0x213b, KEY_INFO},
  86         {KE_KEY, 0x231b, KEY_HELP},
  87         {KE_END, 0}
  88 };
  89
  90 static struct input_dev *hp_wmi_input_dev;
  91 static struct platform_device *hp_wmi_platform_dev;
  92
  93 static struct rfkill *wifi_rfkill;
  94 static struct rfkill *bluetooth_rfkill;
  95 static struct rfkill *wwan_rfkill;
  96
  97 static struct platform_driver hp_wmi_driver = {
  98         .driver = {
  99                    .name = "hp-wmi",
 100                    .owner = THIS_MODULE,
 101         },
 102         .probe = hp_wmi_bios_setup,
 103         .remove = hp_wmi_bios_remove,
 104 };
 105
 106 static int hp_wmi_perform_query(int query, int write, int value)
 107 {
 108         struct bios_return bios_return;
 109         acpi_status status;
 110         union acpi_object *obj;
 111         struct bios_args args = {
 112                 .signature = 0x55434553,
 113                 .command = write ? 0x2 : 0x1,
 114                 .commandtype = query,
 115                 .datasize = write ? 0x4 : 0,
 116                 .data = value,
 117         };
 118         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 119         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 120
 121         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 122
 123         obj = output.pointer;
 124
 125         if (!obj || obj->type != ACPI_TYPE_BUFFER)
 126                 return -EINVAL;
 127
 128         bios_return = *((struct bios_return *)obj->buffer.pointer);
 129         if (bios_return.return_code > 0)
 130                 return bios_return.return_code * -1;
 131         else
 132                 return bios_return.value;
 133 }
 134
 135 static int hp_wmi_display_state(void)
 136 {
 137         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
 138 }
 139
 140 static int hp_wmi_hddtemp_state(void)
 141 {
 142         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
 143 }
 144
 145 static int hp_wmi_als_state(void)
 146 {
 147         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
 148 }
 149
 150 static int hp_wmi_dock_state(void)
 151 {
 152         return hp_wmi_perform_query(HPWMI_DOCK_QUERY, 0, 0);
 153 }
 154
 155 static int hp_wmi_wifi_set(void *data, enum rfkill_state state)
 156 {
 157         if (state)
 158                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x101);
 159         else
 160                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x100);
 161 }
 162
 163 static int hp_wmi_bluetooth_set(void *data, enum rfkill_state state)
 164 {
 165         if (state)
 166                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x202);
 167         else
 168                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x200);
 169 }
 170
 171 static int hp_wmi_wwan_set(void *data, enum rfkill_state state)
 172 {
 173         if (state)
 174                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x404);
 175         else
 176                 return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, 0x400);
 177 }
 178
 179 static int hp_wmi_wifi_state(void)
 180 {
 181         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 182
 183         if (wireless & 0x100)
 184                 return RFKILL_STATE_UNBLOCKED;
 185         else
 186                 return RFKILL_STATE_SOFT_BLOCKED;
 187 }
 188
 189 static int hp_wmi_bluetooth_state(void)
 190 {
 191         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 192
 193         if (wireless & 0x10000)
 194                 return RFKILL_STATE_UNBLOCKED;
 195         else
 196                 return RFKILL_STATE_SOFT_BLOCKED;
 197 }
 198
 199 static int hp_wmi_wwan_state(void)
 200 {
 201         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 202
 203         if (wireless & 0x1000000)
 204                 return RFKILL_STATE_UNBLOCKED;
 205         else
 206                 return RFKILL_STATE_SOFT_BLOCKED;
 207 }
 208
 209 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 210                             char *buf)
 211 {
 212         int value = hp_wmi_display_state();
 213         if (value < 0)
 214                 return -EINVAL;
 215         return sprintf(buf, "%d\n", value);
 216 }
 217
 218 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 219                             char *buf)
 220 {
 221         int value = hp_wmi_hddtemp_state();
 222         if (value < 0)
 223                 return -EINVAL;
 224         return sprintf(buf, "%d\n", value);
 225 }
 226
 227 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 228                         char *buf)
 229 {
 230         int value = hp_wmi_als_state();
 231         if (value < 0)
 232                 return -EINVAL;
 233         return sprintf(buf, "%d\n", value);
 234 }
 235
 236 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 237                          char *buf)
 238 {
 239         int value = hp_wmi_dock_state();
 240         if (value < 0)
 241                 return -EINVAL;
 242         return sprintf(buf, "%d\n", value);
 243 }
 244
 245 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 246                        const char *buf, size_t count)
 247 {
 248         u32 tmp = simple_strtoul(buf, NULL, 10);
 249         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 250         return count;
 251 }
 252
 253 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 254 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 255 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 256 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 257
 258 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 259 {
 260         struct key_entry *key;
 261
 262         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 263                 if (code == key->code)
 264                         return key;
 265
 266         return NULL;
 267 }
 268
 269 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 270 {
 271         struct key_entry *key;
 272
 273         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 274                 if (key->type == KE_KEY && keycode == key->keycode)
 275                         return key;
 276
 277         return NULL;
 278 }
 279
 280 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 281 {
 282         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 283
 284         if (key && key->type == KE_KEY) {
 285                 *keycode = key->keycode;
 286                 return 0;
 287         }
 288
 289         return -EINVAL;
 290 }
 291
 292 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 293 {
 294         struct key_entry *key;
 295         int old_keycode;
 296
 297         if (keycode < 0 || keycode > KEY_MAX)
 298                 return -EINVAL;
 299
 300         key = hp_wmi_get_entry_by_scancode(scancode);
 301         if (key && key->type == KE_KEY) {
 302                 old_keycode = key->keycode;
 303                 key->keycode = keycode;
 304                 set_bit(keycode, dev->keybit);
 305                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 306                         clear_bit(old_keycode, dev->keybit);
 307                 return 0;
 308         }
 309
 310         return -EINVAL;
 311 }
 312
 313 static void hp_wmi_notify(u32 value, void *context)
 314 {
 315         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 316         static struct key_entry *key;
 317         union acpi_object *obj;
 318
 319         wmi_get_event_data(value, &response);
 320
 321         obj = (union acpi_object *)response.pointer;
 322
 323         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
 324                 int eventcode = *((u8 *) obj->buffer.pointer);
 325                 if (eventcode == 0x4)
 326                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 327                                                          0);
 328                 key = hp_wmi_get_entry_by_scancode(eventcode);
 329                 if (key) {
 330                         switch (key->type) {
 331                         case KE_KEY:
 332                                 input_report_key(hp_wmi_input_dev,
 333                                                  key->keycode, 1);
 334                                 input_sync(hp_wmi_input_dev);
 335                                 input_report_key(hp_wmi_input_dev,
 336                                                  key->keycode, 0);
 337                                 input_sync(hp_wmi_input_dev);
 338                                 break;
 339                         case KE_SW:
 340                                 input_report_switch(hp_wmi_input_dev,
 341                                                     key->keycode,
 342                                                     hp_wmi_dock_state());
 343                                 input_sync(hp_wmi_input_dev);
 344                                 break;
 345                         }
 346                 } else if (eventcode == 0x5) {
 347                         if (wifi_rfkill)
 348                                 rfkill_force_state(wifi_rfkill,
 349                                                    hp_wmi_wifi_state());
 350                         if (bluetooth_rfkill)
 351                                 rfkill_force_state(bluetooth_rfkill,
 352                                                    hp_wmi_bluetooth_state());
 353                         if (wwan_rfkill)
 354                                 rfkill_force_state(wwan_rfkill,
 355                                                    hp_wmi_wwan_state());
 356                 } else
 357                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 358                                eventcode);
 359         } else
 360                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 361 }
 362
 363 static int __init hp_wmi_input_setup(void)
 364 {
 365         struct key_entry *key;
 366         int err;
 367
 368         hp_wmi_input_dev = input_allocate_device();
 369
 370         hp_wmi_input_dev->name = "HP WMI hotkeys";
 371         hp_wmi_input_dev->phys = "wmi/input0";
 372         hp_wmi_input_dev->id.bustype = BUS_HOST;
 373         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 374         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 375
 376         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 377                 switch (key->type) {
 378                 case KE_KEY:
 379                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 380                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 381                         break;
 382                 case KE_SW:
 383                         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 384                         set_bit(key->keycode, hp_wmi_input_dev->swbit);
 385                         break;
 386                 }
 387         }
 388
 389         err = input_register_device(hp_wmi_input_dev);
 390
 391         if (err) {
 392                 input_free_device(hp_wmi_input_dev);
 393                 return err;
 394         }
 395
 396         return 0;
 397 }
 398
 399 static void cleanup_sysfs(struct platform_device *device)
 400 {
 401         device_remove_file(&device->dev, &dev_attr_display);
 402         device_remove_file(&device->dev, &dev_attr_hddtemp);
 403         device_remove_file(&device->dev, &dev_attr_als);
 404         device_remove_file(&device->dev, &dev_attr_dock);
 405 }
 406
 407 static int __init hp_wmi_bios_setup(struct platform_device *device)
 408 {
 409         int err;
 410         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 411
 412         err = device_create_file(&device->dev, &dev_attr_display);
 413         if (err)
 414                 goto add_sysfs_error;
 415         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 416         if (err)
 417                 goto add_sysfs_error;
 418         err = device_create_file(&device->dev, &dev_attr_als);
 419         if (err)
 420                 goto add_sysfs_error;
 421         err = device_create_file(&device->dev, &dev_attr_dock);
 422         if (err)
 423                 goto add_sysfs_error;
 424
 425         if (wireless & 0x1) {
 426                 wifi_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WLAN);
 427                 wifi_rfkill->name = "hp-wifi";
 428                 wifi_rfkill->state = hp_wmi_wifi_state();
 429                 wifi_rfkill->toggle_radio = hp_wmi_wifi_set;
 430                 wifi_rfkill->user_claim_unsupported = 1;
 431                 rfkill_register(wifi_rfkill);
 432         }
 433
 434         if (wireless & 0x2) {
 435                 bluetooth_rfkill = rfkill_allocate(&device->dev,
 436                                                    RFKILL_TYPE_BLUETOOTH);
 437                 bluetooth_rfkill->name = "hp-bluetooth";
 438                 bluetooth_rfkill->state = hp_wmi_bluetooth_state();
 439                 bluetooth_rfkill->toggle_radio = hp_wmi_bluetooth_set;
 440                 bluetooth_rfkill->user_claim_unsupported = 1;
 441                 rfkill_register(bluetooth_rfkill);
 442         }
 443
 444         if (wireless & 0x4) {
 445                 wwan_rfkill = rfkill_allocate(&device->dev, RFKILL_TYPE_WWAN);
 446                 wwan_rfkill->name = "hp-wwan";
 447                 wwan_rfkill->state = hp_wmi_wwan_state();
 448                 wwan_rfkill->toggle_radio = hp_wmi_wwan_set;
 449                 wwan_rfkill->user_claim_unsupported = 1;
 450                 rfkill_register(wwan_rfkill);
 451         }
 452
 453         return 0;
 454 add_sysfs_error:
 455         cleanup_sysfs(device);
 456         return err;
 457 }
 458
 459 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 460 {
 461         cleanup_sysfs(device);
 462
 463         if (wifi_rfkill)
 464                 rfkill_unregister(wifi_rfkill);
 465         if (bluetooth_rfkill)
 466                 rfkill_unregister(bluetooth_rfkill);
 467         if (wwan_rfkill)
 468                 rfkill_unregister(wwan_rfkill);
 469
 470         return 0;
 471 }
 472
 473 static int __init hp_wmi_init(void)
 474 {
 475         int err;
 476
 477         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 478                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 479                                                  hp_wmi_notify, NULL);
 480                 if (!err)
 481                         hp_wmi_input_setup();
 482         }
 483
 484         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 485                 err = platform_driver_register(&hp_wmi_driver);
 486                 if (err)
 487                         return 0;
 488                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 489                 if (!hp_wmi_platform_dev) {
 490                         platform_driver_unregister(&hp_wmi_driver);
 491                         return 0;
 492                 }
 493                 platform_device_add(hp_wmi_platform_dev);
 494         }
 495
 496         return 0;
 497 }
 498
 499 static void __exit hp_wmi_exit(void)
 500 {
 501         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 502                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 503                 input_unregister_device(hp_wmi_input_dev);
 504         }
 505         if (hp_wmi_platform_dev) {
 506                 platform_device_del(hp_wmi_platform_dev);
 507                 platform_driver_unregister(&hp_wmi_driver);
 508         }
 509 }
 510
 511 module_init(hp_wmi_init);
 512 module_exit(hp_wmi_exit);