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