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