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 <linux/input/sparse-keymap.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 #define UNIMP "Unimplemented "
  57
  58 enum hp_wmi_radio {
  59         HPWMI_WIFI = 0,
  60         HPWMI_BLUETOOTH = 1,
  61         HPWMI_WWAN = 2,
  62 };
  63
  64 enum hp_wmi_event_ids {
  65         HPWMI_DOCK_EVENT = 1,
  66         HPWMI_PARK_HDD = 2,
  67         HPWMI_SMART_ADAPTER = 3,
  68         HPWMI_BEZEL_BUTTON = 4,
  69         HPWMI_WIRELESS = 5,
  70         HPWMI_CPU_BATTERY_THROTTLE = 6,
  71         HPWMI_LOCK_SWITCH = 7,
  72 };
  73
  74 static int __devinit hp_wmi_bios_setup(struct platform_device *device);
  75 static int __exit hp_wmi_bios_remove(struct platform_device *device);
  76 static int hp_wmi_resume_handler(struct device *device);
  77
  78 struct bios_args {
  79         u32 signature;
  80         u32 command;
  81         u32 commandtype;
  82         u32 datasize;
  83         u32 data;
  84 };
  85
  86 struct bios_return {
  87         u32 sigpass;
  88         u32 return_code;
  89         u32 value;
  90 };
  91
  92 enum hp_return_value {
  93         HPWMI_RET_WRONG_SIGNATURE       = 0x02,
  94         HPWMI_RET_UNKNOWN_COMMAND       = 0x03,
  95         HPWMI_RET_UNKNOWN_CMDTYPE       = 0x04,
  96         HPWMI_RET_INVALID_PARAMETERS    = 0x05,
  97 };
  98
  99 static const struct key_entry hp_wmi_keymap[] = {
 100         { KE_KEY, 0x02,   { KEY_BRIGHTNESSUP } },
 101         { KE_KEY, 0x03,   { KEY_BRIGHTNESSDOWN } },
 102         { KE_KEY, 0x20e6, { KEY_PROG1 } },
 103         { KE_KEY, 0x20e8, { KEY_MEDIA } },
 104         { KE_KEY, 0x2142, { KEY_MEDIA } },
 105         { KE_KEY, 0x213b, { KEY_INFO } },
 106         { KE_KEY, 0x2169, { KEY_DIRECTION } },
 107         { KE_KEY, 0x231b, { KEY_HELP } },
 108         { KE_END, 0 }
 109 };
 110
 111 static struct input_dev *hp_wmi_input_dev;
 112 static struct platform_device *hp_wmi_platform_dev;
 113
 114 static struct rfkill *wifi_rfkill;
 115 static struct rfkill *bluetooth_rfkill;
 116 static struct rfkill *wwan_rfkill;
 117
 118 static const struct dev_pm_ops hp_wmi_pm_ops = {
 119         .resume  = hp_wmi_resume_handler,
 120         .restore  = hp_wmi_resume_handler,
 121 };
 122
 123 static struct platform_driver hp_wmi_driver = {
 124         .driver = {
 125                 .name = "hp-wmi",
 126                 .owner = THIS_MODULE,
 127                 .pm = &hp_wmi_pm_ops,
 128         },
 129         .probe = hp_wmi_bios_setup,
 130         .remove = hp_wmi_bios_remove,
 131 };
 132
 133 /*
 134  * hp_wmi_perform_query
 135  *
 136  * query:       The commandtype -> What should be queried
 137  * write:       The command -> 0 read, 1 write, 3 ODM specific
 138  * buffer:      Buffer used as input and/or output
 139  * buffersize:  Size of buffer
 140  *
 141  * returns zero on success
 142  *         an HP WMI query specific error code (which is positive)
 143  *         -EINVAL if the query was not successful at all
 144  *         -EINVAL if the output buffer size exceeds buffersize
 145  *
 146  * Note: The buffersize must at least be the maximum of the input and output
 147  *       size. E.g. Battery info query (0x7) is defined to have 1 byte input
 148  *       and 128 byte output. The caller would do:
 149  *       buffer = kzalloc(128, GFP_KERNEL);
 150  *       ret = hp_wmi_perform_query(0x7, 0, buffer, 128)
 151  */
 152 static int hp_wmi_perform_query(int query, int write, u32 *buffer,
 153                                 int buffersize)
 154 {
 155         struct bios_return bios_return;
 156         acpi_status status;
 157         union acpi_object *obj;
 158         struct bios_args args = {
 159                 .signature = 0x55434553,
 160                 .command = write ? 0x2 : 0x1,
 161                 .commandtype = query,
 162                 .datasize = buffersize,
 163                 .data = *buffer,
 164         };
 165         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 166         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 167
 168         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 169
 170         obj = output.pointer;
 171
 172         if (!obj)
 173                 return -EINVAL;
 174         else if (obj->type != ACPI_TYPE_BUFFER) {
 175                 kfree(obj);
 176                 return -EINVAL;
 177         }
 178
 179         bios_return = *((struct bios_return *)obj->buffer.pointer);
 180
 181         if (bios_return.return_code) {
 182                 if (bios_return.return_code != HPWMI_RET_UNKNOWN_CMDTYPE)
 183                         printk(KERN_WARNING PREFIX "query 0x%x returned "
 184                                                    "error 0x%x\n",
 185                                query, bios_return.return_code);
 186                 kfree(obj);
 187                 return bios_return.return_code;
 188         }
 189
 190         memcpy(buffer, &bios_return.value, sizeof(bios_return.value));
 191
 192         kfree(obj);
 193         return 0;
 194 }
 195
 196 static int hp_wmi_display_state(void)
 197 {
 198         int state = 0;
 199         int ret = hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, &state,
 200                                        sizeof(state));
 201         if (ret)
 202                 return -EINVAL;
 203         return state;
 204 }
 205
 206 static int hp_wmi_hddtemp_state(void)
 207 {
 208         int state = 0;
 209         int ret = hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, &state,
 210                                        sizeof(state));
 211         if (ret)
 212                 return -EINVAL;
 213         return state;
 214 }
 215
 216 static int hp_wmi_als_state(void)
 217 {
 218         int state = 0;
 219         int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, &state,
 220                                        sizeof(state));
 221         if (ret)
 222                 return -EINVAL;
 223         return state;
 224 }
 225
 226 static int hp_wmi_dock_state(void)
 227 {
 228         int state = 0;
 229         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
 230                                        sizeof(state));
 231
 232         if (ret)
 233                 return -EINVAL;
 234
 235         return state & 0x1;
 236 }
 237
 238 static int hp_wmi_tablet_state(void)
 239 {
 240         int state = 0;
 241         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
 242                                        sizeof(state));
 243         if (ret)
 244                 return ret;
 245
 246         return (state & 0x4) ? 1 : 0;
 247 }
 248
 249 static int hp_wmi_set_block(void *data, bool blocked)
 250 {
 251         enum hp_wmi_radio r = (enum hp_wmi_radio) data;
 252         int query = BIT(r + 8) | ((!blocked) << r);
 253         int ret;
 254
 255         ret = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1,
 256                                    &query, sizeof(query));
 257         if (ret)
 258                 return -EINVAL;
 259         return 0;
 260 }
 261
 262 static const struct rfkill_ops hp_wmi_rfkill_ops = {
 263         .set_block = hp_wmi_set_block,
 264 };
 265
 266 static bool hp_wmi_get_sw_state(enum hp_wmi_radio r)
 267 {
 268         int wireless = 0;
 269         int mask;
 270         hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
 271                              &wireless, sizeof(wireless));
 272         /* TBD: Pass error */
 273
 274         mask = 0x200 << (r * 8);
 275
 276         if (wireless & mask)
 277                 return false;
 278         else
 279                 return true;
 280 }
 281
 282 static bool hp_wmi_get_hw_state(enum hp_wmi_radio r)
 283 {
 284         int wireless = 0;
 285         int mask;
 286         hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
 287                              &wireless, sizeof(wireless));
 288         /* TBD: Pass error */
 289
 290         mask = 0x800 << (r * 8);
 291
 292         if (wireless & mask)
 293                 return false;
 294         else
 295                 return true;
 296 }
 297
 298 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 299                             char *buf)
 300 {
 301         int value = hp_wmi_display_state();
 302         if (value < 0)
 303                 return -EINVAL;
 304         return sprintf(buf, "%d\n", value);
 305 }
 306
 307 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 308                             char *buf)
 309 {
 310         int value = hp_wmi_hddtemp_state();
 311         if (value < 0)
 312                 return -EINVAL;
 313         return sprintf(buf, "%d\n", value);
 314 }
 315
 316 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 317                         char *buf)
 318 {
 319         int value = hp_wmi_als_state();
 320         if (value < 0)
 321                 return -EINVAL;
 322         return sprintf(buf, "%d\n", value);
 323 }
 324
 325 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 326                          char *buf)
 327 {
 328         int value = hp_wmi_dock_state();
 329         if (value < 0)
 330                 return -EINVAL;
 331         return sprintf(buf, "%d\n", value);
 332 }
 333
 334 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
 335                          char *buf)
 336 {
 337         int value = hp_wmi_tablet_state();
 338         if (value < 0)
 339                 return -EINVAL;
 340         return sprintf(buf, "%d\n", value);
 341 }
 342
 343 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 344                        const char *buf, size_t count)
 345 {
 346         u32 tmp = simple_strtoul(buf, NULL, 10);
 347         int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, &tmp,
 348                                        sizeof(tmp));
 349         if (ret)
 350                 return -EINVAL;
 351
 352         return count;
 353 }
 354
 355 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 356 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 357 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 358 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 359 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
 360
 361 static void hp_wmi_notify(u32 value, void *context)
 362 {
 363         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 364         union acpi_object *obj;
 365         u32 event_id, event_data;
 366         int key_code = 0, ret;
 367         u32 *location;
 368         acpi_status status;
 369
 370         status = wmi_get_event_data(value, &response);
 371         if (status != AE_OK) {
 372                 printk(KERN_INFO PREFIX "bad event status 0x%x\n", status);
 373                 return;
 374         }
 375
 376         obj = (union acpi_object *)response.pointer;
 377
 378         if (!obj)
 379                 return;
 380         if (obj->type != ACPI_TYPE_BUFFER) {
 381                 printk(KERN_INFO "hp-wmi: Unknown response received %d\n",
 382                        obj->type);
 383                 kfree(obj);
 384                 return;
 385         }
 386
 387         /*
 388          * Depending on ACPI version the concatenation of id and event data
 389          * inside _WED function will result in a 8 or 16 byte buffer.
 390          */
 391         location = (u32 *)obj->buffer.pointer;
 392         if (obj->buffer.length == 8) {
 393                 event_id = *location;
 394                 event_data = *(location + 1);
 395         } else if (obj->buffer.length == 16) {
 396                 event_id = *location;
 397                 event_data = *(location + 2);
 398         } else {
 399                 printk(KERN_INFO "hp-wmi: Unknown buffer length %d\n",
 400                        obj->buffer.length);
 401                 kfree(obj);
 402                 return;
 403         }
 404         kfree(obj);
 405
 406         switch (event_id) {
 407         case HPWMI_DOCK_EVENT:
 408                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 409                                     hp_wmi_dock_state());
 410                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 411                                     hp_wmi_tablet_state());
 412                 input_sync(hp_wmi_input_dev);
 413                 break;
 414         case HPWMI_PARK_HDD:
 415                 break;
 416         case HPWMI_SMART_ADAPTER:
 417                 break;
 418         case HPWMI_BEZEL_BUTTON:
 419                 ret = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 420                                            &key_code,
 421                                            sizeof(key_code));
 422                 if (ret)
 423                         break;
 424
 425                 if (!sparse_keymap_report_event(hp_wmi_input_dev,
 426                                                 key_code, 1, true))
 427                         printk(KERN_INFO PREFIX "Unknown key code - 0x%x\n",
 428                                key_code);
 429                 break;
 430         case HPWMI_WIRELESS:
 431                 if (wifi_rfkill)
 432                         rfkill_set_states(wifi_rfkill,
 433                                           hp_wmi_get_sw_state(HPWMI_WIFI),
 434                                           hp_wmi_get_hw_state(HPWMI_WIFI));
 435                 if (bluetooth_rfkill)
 436                         rfkill_set_states(bluetooth_rfkill,
 437                                           hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
 438                                           hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 439                 if (wwan_rfkill)
 440                         rfkill_set_states(wwan_rfkill,
 441                                           hp_wmi_get_sw_state(HPWMI_WWAN),
 442                                           hp_wmi_get_hw_state(HPWMI_WWAN));
 443                 break;
 444         case HPWMI_CPU_BATTERY_THROTTLE:
 445                 printk(KERN_INFO PREFIX UNIMP "CPU throttle because of 3 Cell"
 446                        " battery event detected\n");
 447                 break;
 448         case HPWMI_LOCK_SWITCH:
 449                 break;
 450         default:
 451                 printk(KERN_INFO PREFIX "Unknown event_id - %d - 0x%x\n",
 452                        event_id, event_data);
 453                 break;
 454         }
 455 }
 456
 457 static int __init hp_wmi_input_setup(void)
 458 {
 459         acpi_status status;
 460         int err;
 461
 462         hp_wmi_input_dev = input_allocate_device();
 463         if (!hp_wmi_input_dev)
 464                 return -ENOMEM;
 465
 466         hp_wmi_input_dev->name = "HP WMI hotkeys";
 467         hp_wmi_input_dev->phys = "wmi/input0";
 468         hp_wmi_input_dev->id.bustype = BUS_HOST;
 469
 470         __set_bit(EV_SW, hp_wmi_input_dev->evbit);
 471         __set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
 472         __set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
 473
 474         err = sparse_keymap_setup(hp_wmi_input_dev, hp_wmi_keymap, NULL);
 475         if (err)
 476                 goto err_free_dev;
 477
 478         /* Set initial hardware state */
 479         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
 480         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 481                             hp_wmi_tablet_state());
 482         input_sync(hp_wmi_input_dev);
 483
 484         status = wmi_install_notify_handler(HPWMI_EVENT_GUID, hp_wmi_notify, NULL);
 485         if (ACPI_FAILURE(status)) {
 486                 err = -EIO;
 487                 goto err_free_keymap;
 488         }
 489
 490         err = input_register_device(hp_wmi_input_dev);
 491         if (err)
 492                 goto err_uninstall_notifier;
 493
 494         return 0;
 495
 496  err_uninstall_notifier:
 497         wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 498  err_free_keymap:
 499         sparse_keymap_free(hp_wmi_input_dev);
 500  err_free_dev:
 501         input_free_device(hp_wmi_input_dev);
 502         return err;
 503 }
 504
 505 static void hp_wmi_input_destroy(void)
 506 {
 507         wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 508         sparse_keymap_free(hp_wmi_input_dev);
 509         input_unregister_device(hp_wmi_input_dev);
 510 }
 511
 512 static void cleanup_sysfs(struct platform_device *device)
 513 {
 514         device_remove_file(&device->dev, &dev_attr_display);
 515         device_remove_file(&device->dev, &dev_attr_hddtemp);
 516         device_remove_file(&device->dev, &dev_attr_als);
 517         device_remove_file(&device->dev, &dev_attr_dock);
 518         device_remove_file(&device->dev, &dev_attr_tablet);
 519 }
 520
 521 static int __devinit hp_wmi_bios_setup(struct platform_device *device)
 522 {
 523         int err;
 524         int wireless = 0;
 525
 526         err = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, &wireless,
 527                                    sizeof(wireless));
 528         if (err)
 529                 return err;
 530
 531         err = device_create_file(&device->dev, &dev_attr_display);
 532         if (err)
 533                 goto add_sysfs_error;
 534         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 535         if (err)
 536                 goto add_sysfs_error;
 537         err = device_create_file(&device->dev, &dev_attr_als);
 538         if (err)
 539                 goto add_sysfs_error;
 540         err = device_create_file(&device->dev, &dev_attr_dock);
 541         if (err)
 542                 goto add_sysfs_error;
 543         err = device_create_file(&device->dev, &dev_attr_tablet);
 544         if (err)
 545                 goto add_sysfs_error;
 546
 547         if (wireless & 0x1) {
 548                 wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
 549                                            RFKILL_TYPE_WLAN,
 550                                            &hp_wmi_rfkill_ops,
 551                                            (void *) HPWMI_WIFI);
 552                 rfkill_init_sw_state(wifi_rfkill,
 553                                      hp_wmi_get_sw_state(HPWMI_WIFI));
 554                 rfkill_set_hw_state(wifi_rfkill,
 555                                     hp_wmi_get_hw_state(HPWMI_WIFI));
 556                 err = rfkill_register(wifi_rfkill);
 557                 if (err)
 558                         goto register_wifi_error;
 559         }
 560
 561         if (wireless & 0x2) {
 562                 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
 563                                                 RFKILL_TYPE_BLUETOOTH,
 564                                                 &hp_wmi_rfkill_ops,
 565                                                 (void *) HPWMI_BLUETOOTH);
 566                 rfkill_init_sw_state(bluetooth_rfkill,
 567                                      hp_wmi_get_sw_state(HPWMI_BLUETOOTH));
 568                 rfkill_set_hw_state(bluetooth_rfkill,
 569                                     hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 570                 err = rfkill_register(bluetooth_rfkill);
 571                 if (err)
 572                         goto register_bluetooth_error;
 573         }
 574
 575         if (wireless & 0x4) {
 576                 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
 577                                            RFKILL_TYPE_WWAN,
 578                                            &hp_wmi_rfkill_ops,
 579                                            (void *) HPWMI_WWAN);
 580                 rfkill_init_sw_state(wwan_rfkill,
 581                                      hp_wmi_get_sw_state(HPWMI_WWAN));
 582                 rfkill_set_hw_state(wwan_rfkill,
 583                                     hp_wmi_get_hw_state(HPWMI_WWAN));
 584                 err = rfkill_register(wwan_rfkill);
 585                 if (err)
 586                         goto register_wwan_err;
 587         }
 588
 589         return 0;
 590 register_wwan_err:
 591         rfkill_destroy(wwan_rfkill);
 592         if (bluetooth_rfkill)
 593                 rfkill_unregister(bluetooth_rfkill);
 594 register_bluetooth_error:
 595         rfkill_destroy(bluetooth_rfkill);
 596         if (wifi_rfkill)
 597                 rfkill_unregister(wifi_rfkill);
 598 register_wifi_error:
 599         rfkill_destroy(wifi_rfkill);
 600 add_sysfs_error:
 601         cleanup_sysfs(device);
 602         return err;
 603 }
 604
 605 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 606 {
 607         cleanup_sysfs(device);
 608
 609         if (wifi_rfkill) {
 610                 rfkill_unregister(wifi_rfkill);
 611                 rfkill_destroy(wifi_rfkill);
 612         }
 613         if (bluetooth_rfkill) {
 614                 rfkill_unregister(bluetooth_rfkill);
 615                 rfkill_destroy(bluetooth_rfkill);
 616         }
 617         if (wwan_rfkill) {
 618                 rfkill_unregister(wwan_rfkill);
 619                 rfkill_destroy(wwan_rfkill);
 620         }
 621
 622         return 0;
 623 }
 624
 625 static int hp_wmi_resume_handler(struct device *device)
 626 {
 627         /*
 628          * Hardware state may have changed while suspended, so trigger
 629          * input events for the current state. As this is a switch,
 630          * the input layer will only actually pass it on if the state
 631          * changed.
 632          */
 633         if (hp_wmi_input_dev) {
 634                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 635                                     hp_wmi_dock_state());
 636                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 637                                     hp_wmi_tablet_state());
 638                 input_sync(hp_wmi_input_dev);
 639         }
 640
 641         if (wifi_rfkill)
 642                 rfkill_set_states(wifi_rfkill,
 643                                   hp_wmi_get_sw_state(HPWMI_WIFI),
 644                                   hp_wmi_get_hw_state(HPWMI_WIFI));
 645         if (bluetooth_rfkill)
 646                 rfkill_set_states(bluetooth_rfkill,
 647                                   hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
 648                                   hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
 649         if (wwan_rfkill)
 650                 rfkill_set_states(wwan_rfkill,
 651                                   hp_wmi_get_sw_state(HPWMI_WWAN),
 652                                   hp_wmi_get_hw_state(HPWMI_WWAN));
 653
 654         return 0;
 655 }
 656
 657 static int __init hp_wmi_init(void)
 658 {
 659         int err;
 660         int event_capable = wmi_has_guid(HPWMI_EVENT_GUID);
 661         int bios_capable = wmi_has_guid(HPWMI_BIOS_GUID);
 662
 663         if (event_capable) {
 664                 err = hp_wmi_input_setup();
 665                 if (err)
 666                         return err;
 667         }
 668
 669         if (bios_capable) {
 670                 err = platform_driver_register(&hp_wmi_driver);
 671                 if (err)
 672                         goto err_driver_reg;
 673                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 674                 if (!hp_wmi_platform_dev) {
 675                         err = -ENOMEM;
 676                         goto err_device_alloc;
 677                 }
 678                 err = platform_device_add(hp_wmi_platform_dev);
 679                 if (err)
 680                         goto err_device_add;
 681         }
 682
 683         if (!bios_capable && !event_capable)
 684                 return -ENODEV;
 685
 686         return 0;
 687
 688 err_device_add:
 689         platform_device_put(hp_wmi_platform_dev);
 690 err_device_alloc:
 691         platform_driver_unregister(&hp_wmi_driver);
 692 err_driver_reg:
 693         if (event_capable)
 694                 hp_wmi_input_destroy();
 695
 696         return err;
 697 }
 698
 699 static void __exit hp_wmi_exit(void)
 700 {
 701         if (wmi_has_guid(HPWMI_EVENT_GUID))
 702                 hp_wmi_input_destroy();
 703
 704         if (hp_wmi_platform_dev) {
 705                 platform_device_unregister(hp_wmi_platform_dev);
 706                 platform_driver_unregister(&hp_wmi_driver);
 707         }
 708 }
 709
 710 module_init(hp_wmi_init);
 711 module_exit(hp_wmi_exit);