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