drivers/platform/x86/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/slab.h>
  30 #include <linux/types.h>
  31 #include <linux/input.h>
  32 #include <acpi/acpi_drivers.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/acpi.h>
  35 #include <linux/rfkill.h>
  36 #include <linux/string.h>
  37
  38 MODULE_AUTHOR("Matthew Garrett <mjg59@srcf.ucam.org>");
  39 MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
  40 MODULE_LICENSE("GPL");
  41
  42 MODULE_ALIAS("wmi:95F24279-4D7B-4334-9387-ACCDC67EF61C");
  43 MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
  44
  45 #define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
  46 #define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
  47
  48 #define HPWMI_DISPLAY_QUERY 0x1
  49 #define HPWMI_HDDTEMP_QUERY 0x2
  50 #define HPWMI_ALS_QUERY 0x3
  51 #define HPWMI_HARDWARE_QUERY 0x4
  52 #define HPWMI_WIRELESS_QUERY 0x5
  53 #define HPWMI_HOTKEY_QUERY 0xc
  54
  55 #define PREFIX "HP WMI: "
  56
  57 enum hp_wmi_radio {
  58         HPWMI_WIFI = 0,
  59         HPWMI_BLUETOOTH = 1,
  60         HPWMI_WWAN = 2,
  61 };
  62
  63 enum hp_wmi_event_ids {
  64         HPWMI_DOCK_EVENT = 1,
  65         HPWMI_BEZEL_BUTTON = 4,
  66         HPWMI_WIRELESS = 5,
  67 };
  68
  69 static int __devinit hp_wmi_bios_setup(struct platform_device *device);
  70 static int __exit hp_wmi_bios_remove(struct platform_device *device);
  71 static int hp_wmi_resume_handler(struct device *device);
  72
  73 struct bios_args {
  74         u32 signature;
  75         u32 command;
  76         u32 commandtype;
  77         u32 datasize;
  78         u32 data;
  79 };
  80
  81 struct bios_return {
  82         u32 sigpass;
  83         u32 return_code;
  84         u32 value;
  85 };
  86
  87 struct key_entry {
  88         char type;              /* See KE_* below */
  89         u16 code;
  90         u16 keycode;
  91 };
  92
  93 enum { KE_KEY, KE_END };
  94
  95 static struct key_entry hp_wmi_keymap[] = {
  96         {KE_KEY, 0x02, KEY_BRIGHTNESSUP},
  97         {KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
  98         {KE_KEY, 0x20e6, KEY_PROG1},
  99         {KE_KEY, 0x20e8, KEY_MEDIA},
 100         {KE_KEY, 0x2142, KEY_MEDIA},
 101         {KE_KEY, 0x213b, KEY_INFO},
 102         {KE_KEY, 0x2169, KEY_DIRECTION},
 103         {KE_KEY, 0x231b, KEY_HELP},
 104         {KE_END, 0}
 105 };
 106
 107 static struct input_dev *hp_wmi_input_dev;
 108 static struct platform_device *hp_wmi_platform_dev;
 109
 110 static struct rfkill *wifi_rfkill;
 111 static struct rfkill *bluetooth_rfkill;
 112 static struct rfkill *wwan_rfkill;
 113
 114 static const struct dev_pm_ops hp_wmi_pm_ops = {
 115         .resume  = hp_wmi_resume_handler,
 116         .restore  = hp_wmi_resume_handler,
 117 };
 118
 119 static struct platform_driver hp_wmi_driver = {
 120         .driver = {
 121                 .name = "hp-wmi",
 122                 .owner = THIS_MODULE,
 123                 .pm = &hp_wmi_pm_ops,
 124         },
 125         .probe = hp_wmi_bios_setup,
 126         .remove = hp_wmi_bios_remove,
 127 };
 128
 129 static int hp_wmi_perform_query(int query, int write, int value)
 130 {
 131         struct bios_return bios_return;
 132         acpi_status status;
 133         union acpi_object *obj;
 134         struct bios_args args = {
 135                 .signature = 0x55434553,
 136                 .command = write ? 0x2 : 0x1,
 137                 .commandtype = query,
 138                 .datasize = write ? 0x4 : 0,
 139                 .data = value,
 140         };
 141         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 142         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 143
 144         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 145
 146         obj = output.pointer;
 147
 148         if (!obj)
 149                 return -EINVAL;
 150         else if (obj->type != ACPI_TYPE_BUFFER) {
 151                 kfree(obj);
 152                 return -EINVAL;
 153         }
 154
 155         bios_return = *((struct bios_return *)obj->buffer.pointer);
 156         kfree(obj);
 157         if (bios_return.return_code > 0)
 158                 return bios_return.return_code * -1;
 159         else
 160                 return bios_return.value;
 161 }
 162
 163 static int hp_wmi_display_state(void)
 164 {
 165         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
 166 }
 167
 168 static int hp_wmi_hddtemp_state(void)
 169 {
 170         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
 171 }
 172
 173 static int hp_wmi_als_state(void)
 174 {
 175         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
 176 }
 177
 178 static int hp_wmi_dock_state(void)
 179 {
 180         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 181
 182         if (ret < 0)
 183                 return ret;
 184
 185         return ret & 0x1;
 186 }
 187
 188 static int hp_wmi_tablet_state(void)
 189 {
 190         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 191
 192         if (ret < 0)
 193                 return ret;
 194
 195         return (ret & 0x4) ? 1 : 0;
 196 }
 197
 198 static int hp_wmi_set_block(void *data, bool blocked)
 199 {
 200         enum hp_wmi_radio r = (enum hp_wmi_radio) data;
 201         int query = BIT(r + 8) | ((!blocked) << r);
 202
 203         return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);
 204 }
 205
 206 static const struct rfkill_ops hp_wmi_rfkill_ops = {
 207         .set_block = hp_wmi_set_block,
 208 };
 209
 210 static bool hp_wmi_get_sw_state(enum hp_wmi_radio r)
 211 {
 212         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 213         int mask = 0x200 << (r * 8);
 214
 215         if (wireless & mask)
 216                 return false;
 217         else
 218                 return true;
 219 }
 220
 221 static bool hp_wmi_get_hw_state(enum hp_wmi_radio r)
 222 {
 223         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 224         int mask = 0x800 << (r * 8);
 225
 226         if (wireless & mask)
 227                 return false;
 228         else
 229                 return true;
 230 }
 231
 232 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 233                             char *buf)
 234 {
 235         int value = hp_wmi_display_state();
 236         if (value < 0)
 237                 return -EINVAL;
 238         return sprintf(buf, "%d\n", value);
 239 }
 240
 241 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 242                             char *buf)
 243 {
 244         int value = hp_wmi_hddtemp_state();
 245         if (value < 0)
 246                 return -EINVAL;
 247         return sprintf(buf, "%d\n", value);
 248 }
 249
 250 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 251                         char *buf)
 252 {
 253         int value = hp_wmi_als_state();
 254         if (value < 0)
 255                 return -EINVAL;
 256         return sprintf(buf, "%d\n", value);
 257 }
 258
 259 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 260                          char *buf)
 261 {
 262         int value = hp_wmi_dock_state();
 263         if (value < 0)
 264                 return -EINVAL;
 265         return sprintf(buf, "%d\n", value);
 266 }
 267
 268 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
 269                          char *buf)
 270 {
 271         int value = hp_wmi_tablet_state();
 272         if (value < 0)
 273                 return -EINVAL;
 274         return sprintf(buf, "%d\n", value);
 275 }
 276
 277 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 278                        const char *buf, size_t count)
 279 {
 280         u32 tmp = simple_strtoul(buf, NULL, 10);
 281         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 282         return count;
 283 }
 284
 285 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 286 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 287 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 288 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 289 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
 290
 291 static struct key_entry *hp_wmi_get_entry_by_scancode(unsigned int code)
 292 {
 293         struct key_entry *key;
 294
 295         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 296                 if (code == key->code)
 297                         return key;
 298
 299         return NULL;
 300 }
 301
 302 static struct key_entry *hp_wmi_get_entry_by_keycode(unsigned int keycode)
 303 {
 304         struct key_entry *key;
 305
 306         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 307                 if (key->type == KE_KEY && keycode == key->keycode)
 308                         return key;
 309
 310         return NULL;
 311 }
 312
 313 static int hp_wmi_getkeycode(struct input_dev *dev,
 314                              unsigned int scancode, unsigned int *keycode)
 315 {
 316         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 317
 318         if (key && key->type == KE_KEY) {
 319                 *keycode = key->keycode;
 320                 return 0;
 321         }
 322
 323         return -EINVAL;
 324 }
 325
 326 static int hp_wmi_setkeycode(struct input_dev *dev,
 327                              unsigned int scancode, unsigned int keycode)
 328 {
 329         struct key_entry *key;
 330         unsigned int old_keycode;
 331
 332         key = hp_wmi_get_entry_by_scancode(scancode);
 333         if (key && key->type == KE_KEY) {
 334                 old_keycode = key->keycode;
 335                 key->keycode = keycode;
 336                 set_bit(keycode, dev->keybit);
 337                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 338                         clear_bit(old_keycode, dev->keybit);
 339                 return 0;
 340         }
 341
 342         return -EINVAL;
 343 }
 344
 345 static void hp_wmi_notify(u32 value, void *context)
 346 {
 347         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 348         static struct key_entry *key;
 349         union acpi_object *obj;
 350         int eventcode, key_code;
 351         acpi_status status;
 352
 353         status = wmi_get_event_data(value, &response);
 354         if (status != AE_OK) {
 355                 printk(KERN_INFO PREFIX "bad event status 0x%x\n", status);
 356                 return;
 357         }
 358
 359         obj = (union acpi_object *)response.pointer;
 360
 361         if (!obj || obj->type != ACPI_TYPE_BUFFER || obj->buffer.length != 8) {
 362                 printk(KERN_INFO PREFIX "Unknown response received\n");
 363                 kfree(obj);
 364                 return;
 365         }
 366
 367         eventcode = *((u8 *) obj->buffer.pointer);
 368         kfree(obj);
 369         switch (eventcode) {
 370         case HPWMI_DOCK_EVENT:
 371                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 372                                     hp_wmi_dock_state());
 373                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 374                                     hp_wmi_tablet_state());
 375                 input_sync(hp_wmi_input_dev);
 376                 break;
 377         case HPWMI_BEZEL_BUTTON:
 378                 key_code = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 379                                                  0);
 380                 key = hp_wmi_get_entry_by_scancode(key_code);
 381                 if (key) {
 382                         switch (key->type) {
 383                         case KE_KEY:
 384                                 input_report_key(hp_wmi_input_dev,
 385                                                  key->keycode, 1);
 386                                 input_sync(hp_wmi_input_dev);
 387                                 input_report_key(hp_wmi_input_dev,
 388                                                  key->keycode, 0);
 389                                 input_sync(hp_wmi_input_dev);
 390                                 break;
 391                         }
 392                 } else
 393                         printk(KERN_INFO PREFIX "Unknown key code - 0x%x\n",
 394                                key_code);
 395                 break;
 396         case HPWMI_WIRELESS:
 397                 if (wifi_rfkill)
 398                         rfkill_set_states(wifi_rfkill,
 399                                           hp_wmi_get_sw_state(HPWMI_WIFI),
 400                                           hp_wmi_get_hw_state(HPWMI_WIFI));
 401                 if (bluetooth_rfkill)
 402                         rfkill_set_states(bluetooth_rfkill,
 403                                           hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
 404                                           hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 405                 if (wwan_rfkill)
 406                         rfkill_set_states(wwan_rfkill,
 407                                           hp_wmi_get_sw_state(HPWMI_WWAN),
 408                                           hp_wmi_get_hw_state(HPWMI_WWAN));
 409                 break;
 410         default:
 411                 printk(KERN_INFO PREFIX "Unknown eventcode - %d\n",
 412                        eventcode);
 413                 break;
 414         }
 415 }
 416
 417 static int __init hp_wmi_input_setup(void)
 418 {
 419         struct key_entry *key;
 420         int err;
 421
 422         hp_wmi_input_dev = input_allocate_device();
 423
 424         hp_wmi_input_dev->name = "HP WMI hotkeys";
 425         hp_wmi_input_dev->phys = "wmi/input0";
 426         hp_wmi_input_dev->id.bustype = BUS_HOST;
 427         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 428         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 429
 430         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 431                 switch (key->type) {
 432                 case KE_KEY:
 433                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 434                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 435                         break;
 436                 }
 437         }
 438
 439         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 440         set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
 441         set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
 442
 443         /* Set initial hardware state */
 444         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
 445         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 446                             hp_wmi_tablet_state());
 447         input_sync(hp_wmi_input_dev);
 448
 449         err = input_register_device(hp_wmi_input_dev);
 450
 451         if (err) {
 452                 input_free_device(hp_wmi_input_dev);
 453                 return err;
 454         }
 455
 456         return 0;
 457 }
 458
 459 static void cleanup_sysfs(struct platform_device *device)
 460 {
 461         device_remove_file(&device->dev, &dev_attr_display);
 462         device_remove_file(&device->dev, &dev_attr_hddtemp);
 463         device_remove_file(&device->dev, &dev_attr_als);
 464         device_remove_file(&device->dev, &dev_attr_dock);
 465         device_remove_file(&device->dev, &dev_attr_tablet);
 466 }
 467
 468 static int __devinit hp_wmi_bios_setup(struct platform_device *device)
 469 {
 470         int err;
 471         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 472
 473         err = device_create_file(&device->dev, &dev_attr_display);
 474         if (err)
 475                 goto add_sysfs_error;
 476         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 477         if (err)
 478                 goto add_sysfs_error;
 479         err = device_create_file(&device->dev, &dev_attr_als);
 480         if (err)
 481                 goto add_sysfs_error;
 482         err = device_create_file(&device->dev, &dev_attr_dock);
 483         if (err)
 484                 goto add_sysfs_error;
 485         err = device_create_file(&device->dev, &dev_attr_tablet);
 486         if (err)
 487                 goto add_sysfs_error;
 488
 489         if (wireless & 0x1) {
 490                 wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
 491                                            RFKILL_TYPE_WLAN,
 492                                            &hp_wmi_rfkill_ops,
 493                                            (void *) HPWMI_WIFI);
 494                 rfkill_init_sw_state(wifi_rfkill,
 495                                      hp_wmi_get_sw_state(HPWMI_WIFI));
 496                 rfkill_set_hw_state(wifi_rfkill,
 497                                     hp_wmi_get_hw_state(HPWMI_WIFI));
 498                 err = rfkill_register(wifi_rfkill);
 499                 if (err)
 500                         goto register_wifi_error;
 501         }
 502
 503         if (wireless & 0x2) {
 504                 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
 505                                                 RFKILL_TYPE_BLUETOOTH,
 506                                                 &hp_wmi_rfkill_ops,
 507                                                 (void *) HPWMI_BLUETOOTH);
 508                 rfkill_init_sw_state(bluetooth_rfkill,
 509                                      hp_wmi_get_sw_state(HPWMI_BLUETOOTH));
 510                 rfkill_set_hw_state(bluetooth_rfkill,
 511                                     hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 512                 err = rfkill_register(bluetooth_rfkill);
 513                 if (err)
 514                         goto register_bluetooth_error;
 515         }
 516
 517         if (wireless & 0x4) {
 518                 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
 519                                            RFKILL_TYPE_WWAN,
 520                                            &hp_wmi_rfkill_ops,
 521                                            (void *) HPWMI_WWAN);
 522                 rfkill_init_sw_state(wwan_rfkill,
 523                                      hp_wmi_get_sw_state(HPWMI_WWAN));
 524                 rfkill_set_hw_state(wwan_rfkill,
 525                                     hp_wmi_get_hw_state(HPWMI_WWAN));
 526                 err = rfkill_register(wwan_rfkill);
 527                 if (err)
 528                         goto register_wwan_err;
 529         }
 530
 531         return 0;
 532 register_wwan_err:
 533         rfkill_destroy(wwan_rfkill);
 534         if (bluetooth_rfkill)
 535                 rfkill_unregister(bluetooth_rfkill);
 536 register_bluetooth_error:
 537         rfkill_destroy(bluetooth_rfkill);
 538         if (wifi_rfkill)
 539                 rfkill_unregister(wifi_rfkill);
 540 register_wifi_error:
 541         rfkill_destroy(wifi_rfkill);
 542 add_sysfs_error:
 543         cleanup_sysfs(device);
 544         return err;
 545 }
 546
 547 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 548 {
 549         cleanup_sysfs(device);
 550
 551         if (wifi_rfkill) {
 552                 rfkill_unregister(wifi_rfkill);
 553                 rfkill_destroy(wifi_rfkill);
 554         }
 555         if (bluetooth_rfkill) {
 556                 rfkill_unregister(bluetooth_rfkill);
 557                 rfkill_destroy(bluetooth_rfkill);
 558         }
 559         if (wwan_rfkill) {
 560                 rfkill_unregister(wwan_rfkill);
 561                 rfkill_destroy(wwan_rfkill);
 562         }
 563
 564         return 0;
 565 }
 566
 567 static int hp_wmi_resume_handler(struct device *device)
 568 {
 569         /*
 570          * Hardware state may have changed while suspended, so trigger
 571          * input events for the current state. As this is a switch,
 572          * the input layer will only actually pass it on if the state
 573          * changed.
 574          */
 575         if (hp_wmi_input_dev) {
 576                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 577                                     hp_wmi_dock_state());
 578                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 579                                     hp_wmi_tablet_state());
 580                 input_sync(hp_wmi_input_dev);
 581         }
 582
 583         if (wifi_rfkill)
 584                 rfkill_set_states(wifi_rfkill,
 585                                   hp_wmi_get_sw_state(HPWMI_WIFI),
 586                                   hp_wmi_get_hw_state(HPWMI_WIFI));
 587         if (bluetooth_rfkill)
 588                 rfkill_set_states(bluetooth_rfkill,
 589                                   hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
 590                                   hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 591         if (wwan_rfkill)
 592                 rfkill_set_states(wwan_rfkill,
 593                                   hp_wmi_get_sw_state(HPWMI_WWAN),
 594                                   hp_wmi_get_hw_state(HPWMI_WWAN));
 595
 596         return 0;
 597 }
 598
 599 static int __init hp_wmi_init(void)
 600 {
 601         int err;
 602
 603         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 604                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 605                                                  hp_wmi_notify, NULL);
 606                 if (ACPI_SUCCESS(err))
 607                         hp_wmi_input_setup();
 608         }
 609
 610         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 611                 err = platform_driver_register(&hp_wmi_driver);
 612                 if (err)
 613                         return 0;
 614                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 615                 if (!hp_wmi_platform_dev) {
 616                         platform_driver_unregister(&hp_wmi_driver);
 617                         return 0;
 618                 }
 619                 platform_device_add(hp_wmi_platform_dev);
 620         }
 621
 622         return 0;
 623 }
 624
 625 static void __exit hp_wmi_exit(void)
 626 {
 627         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 628                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 629                 input_unregister_device(hp_wmi_input_dev);
 630         }
 631         if (hp_wmi_platform_dev) {
 632                 platform_device_del(hp_wmi_platform_dev);
 633                 platform_driver_unregister(&hp_wmi_driver);
 634         }
 635 }
 636
 637 module_init(hp_wmi_init);
 638 module_exit(hp_wmi_exit);