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