drivers/platform/x86/asus-wmi.c

   1 /*
   2  * Asus PC WMI hotkey driver
   3  *
   4  * Copyright(C) 2010 Intel Corporation.
   5  * Copyright(C) 2010-2011 Corentin Chary <corentin.chary@gmail.com>
   6  *
   7  * Portions based on wistron_btns.c:
   8  * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
   9  * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
  10  * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/types.h>
  33 #include <linux/slab.h>
  34 #include <linux/input.h>
  35 #include <linux/input/sparse-keymap.h>
  36 #include <linux/fb.h>
  37 #include <linux/backlight.h>
  38 #include <linux/leds.h>
  39 #include <linux/rfkill.h>
  40 #include <linux/pci.h>
  41 #include <linux/pci_hotplug.h>
  42 #include <linux/debugfs.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/platform_device.h>
  45 #include <acpi/acpi_bus.h>
  46 #include <acpi/acpi_drivers.h>
  47
  48 #include "asus-wmi.h"
  49
  50 MODULE_AUTHOR("Corentin Chary <corentincj@iksaif.net>, "
  51               "Yong Wang <yong.y.wang@intel.com>");
  52 MODULE_DESCRIPTION("Asus Generic WMI Driver");
  53 MODULE_LICENSE("GPL");
  54
  55 #define to_platform_driver(drv)                                 \
  56         (container_of((drv), struct platform_driver, driver))
  57
  58 #define to_asus_wmi_driver(pdrv)                                        \
  59         (container_of((pdrv), struct asus_wmi_driver, platform_driver))
  60
  61 #define ASUS_WMI_MGMT_GUID      "97845ED0-4E6D-11DE-8A39-0800200C9A66"
  62
  63 #define NOTIFY_BRNUP_MIN                0x11
  64 #define NOTIFY_BRNUP_MAX                0x1f
  65 #define NOTIFY_BRNDOWN_MIN              0x20
  66 #define NOTIFY_BRNDOWN_MAX              0x2e
  67
  68 /* WMI Methods */
  69 #define ASUS_WMI_METHODID_DSTS          0x53544344
  70 #define ASUS_WMI_METHODID_DEVS          0x53564544
  71 #define ASUS_WMI_METHODID_CFVS          0x53564643
  72
  73 /* Wireless */
  74 #define ASUS_WMI_DEVID_WLAN             0x00010011
  75 #define ASUS_WMI_DEVID_BLUETOOTH        0x00010013
  76 #define ASUS_WMI_DEVID_WIMAX            0x00010017
  77 #define ASUS_WMI_DEVID_WWAN3G           0x00010019
  78
  79 /* Backlight and Brightness */
  80 #define ASUS_WMI_DEVID_BACKLIGHT        0x00050011
  81 #define ASUS_WMI_DEVID_BRIGHTNESS       0x00050012
  82
  83 /* Misc */
  84 #define ASUS_WMI_DEVID_CAMERA           0x00060013
  85
  86 /* Storage */
  87 #define ASUS_WMI_DEVID_CARDREADER       0x00080013
  88
  89 /* Input */
  90 #define ASUS_WMI_DEVID_TOUCHPAD         0x00100011
  91 #define ASUS_WMI_DEVID_TOUCHPAD_LED     0x00100012
  92
  93 /* DSTS masks */
  94 #define ASUS_WMI_DSTS_STATUS_BIT        0x00000001
  95 #define ASUS_WMI_DSTS_PRESENCE_BIT      0x00010000
  96 #define ASUS_WMI_DSTS_BRIGHTNESS_MASK   0x000000FF
  97 #define ASUS_WMI_DSTS_MAX_BRIGTH_MASK   0x0000FF00
  98
  99 struct bios_args {
 100         u32 dev_id;
 101         u32 ctrl_param;
 102 };
 103
 104 /*
 105  * <platform>/    - debugfs root directory
 106  *   dev_id      - current dev_id
 107  *   ctrl_param  - current ctrl_param
 108  *   devs        - call DEVS(dev_id, ctrl_param) and print result
 109  *   dsts        - call DSTS(dev_id)  and print result
 110  */
 111 struct asus_wmi_debug {
 112         struct dentry *root;
 113         u32 dev_id;
 114         u32 ctrl_param;
 115 };
 116
 117 struct asus_wmi {
 118         struct input_dev *inputdev;
 119         struct backlight_device *backlight_device;
 120         struct platform_device *platform_device;
 121
 122         struct led_classdev tpd_led;
 123         int tpd_led_wk;
 124         struct workqueue_struct *led_workqueue;
 125         struct work_struct tpd_led_work;
 126
 127         struct rfkill *wlan_rfkill;
 128         struct rfkill *bluetooth_rfkill;
 129         struct rfkill *wimax_rfkill;
 130         struct rfkill *wwan3g_rfkill;
 131
 132         struct hotplug_slot *hotplug_slot;
 133         struct mutex hotplug_lock;
 134         struct mutex wmi_lock;
 135         struct workqueue_struct *hotplug_workqueue;
 136         struct work_struct hotplug_work;
 137
 138         struct asus_wmi_debug debug;
 139
 140         struct asus_wmi_driver *driver;
 141 };
 142
 143 static int asus_wmi_input_init(struct asus_wmi *asus)
 144 {
 145         int err;
 146
 147         asus->inputdev = input_allocate_device();
 148         if (!asus->inputdev)
 149                 return -ENOMEM;
 150
 151         asus->inputdev->name = asus->driver->input_phys;
 152         asus->inputdev->phys = asus->driver->input_name;
 153         asus->inputdev->id.bustype = BUS_HOST;
 154         asus->inputdev->dev.parent = &asus->platform_device->dev;
 155
 156         err = sparse_keymap_setup(asus->inputdev, asus->driver->keymap, NULL);
 157         if (err)
 158                 goto err_free_dev;
 159
 160         err = input_register_device(asus->inputdev);
 161         if (err)
 162                 goto err_free_keymap;
 163
 164         return 0;
 165
 166 err_free_keymap:
 167         sparse_keymap_free(asus->inputdev);
 168 err_free_dev:
 169         input_free_device(asus->inputdev);
 170         return err;
 171 }
 172
 173 static void asus_wmi_input_exit(struct asus_wmi *asus)
 174 {
 175         if (asus->inputdev) {
 176                 sparse_keymap_free(asus->inputdev);
 177                 input_unregister_device(asus->inputdev);
 178         }
 179
 180         asus->inputdev = NULL;
 181 }
 182
 183 static acpi_status asus_wmi_get_devstate(u32 dev_id, u32 *retval)
 184 {
 185         struct acpi_buffer input = { (acpi_size) sizeof(u32), &dev_id };
 186         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 187         union acpi_object *obj;
 188         acpi_status status;
 189         u32 tmp;
 190
 191         status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID,
 192                                      1, ASUS_WMI_METHODID_DSTS,
 193                                      &input, &output);
 194
 195         if (ACPI_FAILURE(status))
 196                 return status;
 197
 198         obj = (union acpi_object *)output.pointer;
 199         if (obj && obj->type == ACPI_TYPE_INTEGER)
 200                 tmp = (u32) obj->integer.value;
 201         else
 202                 tmp = 0;
 203
 204         if (retval)
 205                 *retval = tmp;
 206
 207         kfree(obj);
 208
 209         return status;
 210
 211 }
 212
 213 static acpi_status asus_wmi_set_devstate(u32 dev_id, u32 ctrl_param,
 214                                          u32 *retval)
 215 {
 216         struct bios_args args = {
 217                 .dev_id = dev_id,
 218                 .ctrl_param = ctrl_param,
 219         };
 220         struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
 221         acpi_status status;
 222
 223         if (!retval) {
 224                 status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, 1,
 225                                              ASUS_WMI_METHODID_DEVS,
 226                                              &input, NULL);
 227         } else {
 228                 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 229                 union acpi_object *obj;
 230                 u32 tmp;
 231
 232                 status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, 1,
 233                                              ASUS_WMI_METHODID_DEVS,
 234                                              &input, &output);
 235
 236                 if (ACPI_FAILURE(status))
 237                         return status;
 238
 239                 obj = (union acpi_object *)output.pointer;
 240                 if (obj && obj->type == ACPI_TYPE_INTEGER)
 241                         tmp = (u32) obj->integer.value;
 242                 else
 243                         tmp = 0;
 244
 245                 *retval = tmp;
 246
 247                 kfree(obj);
 248         }
 249
 250         return status;
 251 }
 252
 253 /* Helper for special devices with magic return codes */
 254 static int asus_wmi_get_devstate_bits(u32 dev_id, u32 mask)
 255 {
 256         u32 retval = 0;
 257         acpi_status status;
 258
 259         status = asus_wmi_get_devstate(dev_id, &retval);
 260
 261         if (ACPI_FAILURE(status))
 262                 return -EINVAL;
 263
 264         if (!(retval & ASUS_WMI_DSTS_PRESENCE_BIT))
 265                 return -ENODEV;
 266
 267         return retval & mask;
 268 }
 269
 270 static int asus_wmi_get_devstate_simple(u32 dev_id)
 271 {
 272         return asus_wmi_get_devstate_bits(dev_id, ASUS_WMI_DSTS_STATUS_BIT);
 273 }
 274
 275 /*
 276  * LEDs
 277  */
 278 /*
 279  * These functions actually update the LED's, and are called from a
 280  * workqueue. By doing this as separate work rather than when the LED
 281  * subsystem asks, we avoid messing with the Asus ACPI stuff during a
 282  * potentially bad time, such as a timer interrupt.
 283  */
 284 static void tpd_led_update(struct work_struct *work)
 285 {
 286         int ctrl_param;
 287         struct asus_wmi *asus;
 288
 289         asus = container_of(work, struct asus_wmi, tpd_led_work);
 290
 291         ctrl_param = asus->tpd_led_wk;
 292         asus_wmi_set_devstate(ASUS_WMI_DEVID_TOUCHPAD_LED, ctrl_param, NULL);
 293 }
 294
 295 static void tpd_led_set(struct led_classdev *led_cdev,
 296                         enum led_brightness value)
 297 {
 298         struct asus_wmi *asus;
 299
 300         asus = container_of(led_cdev, struct asus_wmi, tpd_led);
 301
 302         asus->tpd_led_wk = !!value;
 303         queue_work(asus->led_workqueue, &asus->tpd_led_work);
 304 }
 305
 306 static int read_tpd_led_state(struct asus_wmi *asus)
 307 {
 308         return asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_TOUCHPAD_LED);
 309 }
 310
 311 static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
 312 {
 313         struct asus_wmi *asus;
 314
 315         asus = container_of(led_cdev, struct asus_wmi, tpd_led);
 316
 317         return read_tpd_led_state(asus);
 318 }
 319
 320 static int asus_wmi_led_init(struct asus_wmi *asus)
 321 {
 322         int rv;
 323
 324         if (read_tpd_led_state(asus) < 0)
 325                 return 0;
 326
 327         asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
 328         if (!asus->led_workqueue)
 329                 return -ENOMEM;
 330         INIT_WORK(&asus->tpd_led_work, tpd_led_update);
 331
 332         asus->tpd_led.name = "asus::touchpad";
 333         asus->tpd_led.brightness_set = tpd_led_set;
 334         asus->tpd_led.brightness_get = tpd_led_get;
 335         asus->tpd_led.max_brightness = 1;
 336
 337         rv = led_classdev_register(&asus->platform_device->dev, &asus->tpd_led);
 338         if (rv) {
 339                 destroy_workqueue(asus->led_workqueue);
 340                 return rv;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static void asus_wmi_led_exit(struct asus_wmi *asus)
 347 {
 348         if (asus->tpd_led.dev)
 349                 led_classdev_unregister(&asus->tpd_led);
 350         if (asus->led_workqueue)
 351                 destroy_workqueue(asus->led_workqueue);
 352 }
 353
 354 /*
 355  * PCI hotplug (for wlan rfkill)
 356  */
 357 static bool asus_wlan_rfkill_blocked(struct asus_wmi *asus)
 358 {
 359         int result = asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_WLAN);
 360
 361         if (result < 0)
 362                 return false;
 363         return !result;
 364 }
 365
 366 static void asus_rfkill_hotplug(struct asus_wmi *asus)
 367 {
 368         struct pci_dev *dev;
 369         struct pci_bus *bus;
 370         bool blocked;
 371         bool absent;
 372         u32 l;
 373
 374         mutex_lock(&asus->wmi_lock);
 375         blocked = asus_wlan_rfkill_blocked(asus);
 376         mutex_unlock(&asus->wmi_lock);
 377
 378         mutex_lock(&asus->hotplug_lock);
 379
 380         if (asus->wlan_rfkill)
 381                 rfkill_set_sw_state(asus->wlan_rfkill, blocked);
 382
 383         if (asus->hotplug_slot) {
 384                 bus = pci_find_bus(0, 1);
 385                 if (!bus) {
 386                         pr_warning("Unable to find PCI bus 1?\n");
 387                         goto out_unlock;
 388                 }
 389
 390                 if (pci_bus_read_config_dword(bus, 0, PCI_VENDOR_ID, &l)) {
 391                         pr_err("Unable to read PCI config space?\n");
 392                         goto out_unlock;
 393                 }
 394                 absent = (l == 0xffffffff);
 395
 396                 if (blocked != absent) {
 397                         pr_warning("BIOS says wireless lan is %s, "
 398                                    "but the pci device is %s\n",
 399                                    blocked ? "blocked" : "unblocked",
 400                                    absent ? "absent" : "present");
 401                         pr_warning("skipped wireless hotplug as probably "
 402                                    "inappropriate for this model\n");
 403                         goto out_unlock;
 404                 }
 405
 406                 if (!blocked) {
 407                         dev = pci_get_slot(bus, 0);
 408                         if (dev) {
 409                                 /* Device already present */
 410                                 pci_dev_put(dev);
 411                                 goto out_unlock;
 412                         }
 413                         dev = pci_scan_single_device(bus, 0);
 414                         if (dev) {
 415                                 pci_bus_assign_resources(bus);
 416                                 if (pci_bus_add_device(dev))
 417                                         pr_err("Unable to hotplug wifi\n");
 418                         }
 419                 } else {
 420                         dev = pci_get_slot(bus, 0);
 421                         if (dev) {
 422                                 pci_remove_bus_device(dev);
 423                                 pci_dev_put(dev);
 424                         }
 425                 }
 426         }
 427
 428 out_unlock:
 429         mutex_unlock(&asus->hotplug_lock);
 430 }
 431
 432 static void asus_rfkill_notify(acpi_handle handle, u32 event, void *data)
 433 {
 434         struct asus_wmi *asus = data;
 435
 436         if (event != ACPI_NOTIFY_BUS_CHECK)
 437                 return;
 438
 439         /*
 440          * We can't call directly asus_rfkill_hotplug because most
 441          * of the time WMBC is still being executed and not reetrant.
 442          * There is currently no way to tell ACPICA that  we want this
 443          * method to be serialized, we schedule a asus_rfkill_hotplug
 444          * call later, in a safer context.
 445          */
 446         queue_work(asus->hotplug_workqueue, &asus->hotplug_work);
 447 }
 448
 449 static int asus_register_rfkill_notifier(struct asus_wmi *asus, char *node)
 450 {
 451         acpi_status status;
 452         acpi_handle handle;
 453
 454         status = acpi_get_handle(NULL, node, &handle);
 455
 456         if (ACPI_SUCCESS(status)) {
 457                 status = acpi_install_notify_handler(handle,
 458                                                      ACPI_SYSTEM_NOTIFY,
 459                                                      asus_rfkill_notify, asus);
 460                 if (ACPI_FAILURE(status))
 461                         pr_warning("Failed to register notify on %s\n", node);
 462         } else
 463                 return -ENODEV;
 464
 465         return 0;
 466 }
 467
 468 static void asus_unregister_rfkill_notifier(struct asus_wmi *asus, char *node)
 469 {
 470         acpi_status status = AE_OK;
 471         acpi_handle handle;
 472
 473         status = acpi_get_handle(NULL, node, &handle);
 474
 475         if (ACPI_SUCCESS(status)) {
 476                 status = acpi_remove_notify_handler(handle,
 477                                                     ACPI_SYSTEM_NOTIFY,
 478                                                     asus_rfkill_notify);
 479                 if (ACPI_FAILURE(status))
 480                         pr_err("Error removing rfkill notify handler %s\n",
 481                                node);
 482         }
 483 }
 484
 485 static int asus_get_adapter_status(struct hotplug_slot *hotplug_slot,
 486                                    u8 *value)
 487 {
 488         int result = asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_WLAN);
 489
 490         if (result < 0)
 491                 return result;
 492
 493         *value = !!result;
 494         return 0;
 495 }
 496
 497 static void asus_cleanup_pci_hotplug(struct hotplug_slot *hotplug_slot)
 498 {
 499         kfree(hotplug_slot->info);
 500         kfree(hotplug_slot);
 501 }
 502
 503 static struct hotplug_slot_ops asus_hotplug_slot_ops = {
 504         .owner = THIS_MODULE,
 505         .get_adapter_status = asus_get_adapter_status,
 506         .get_power_status = asus_get_adapter_status,
 507 };
 508
 509 static void asus_hotplug_work(struct work_struct *work)
 510 {
 511         struct asus_wmi *asus;
 512
 513         asus = container_of(work, struct asus_wmi, hotplug_work);
 514         asus_rfkill_hotplug(asus);
 515 }
 516
 517 static int asus_setup_pci_hotplug(struct asus_wmi *asus)
 518 {
 519         int ret = -ENOMEM;
 520         struct pci_bus *bus = pci_find_bus(0, 1);
 521
 522         if (!bus) {
 523                 pr_err("Unable to find wifi PCI bus\n");
 524                 return -ENODEV;
 525         }
 526
 527         asus->hotplug_workqueue =
 528             create_singlethread_workqueue("hotplug_workqueue");
 529         if (!asus->hotplug_workqueue)
 530                 goto error_workqueue;
 531
 532         INIT_WORK(&asus->hotplug_work, asus_hotplug_work);
 533
 534         asus->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
 535         if (!asus->hotplug_slot)
 536                 goto error_slot;
 537
 538         asus->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
 539                                            GFP_KERNEL);
 540         if (!asus->hotplug_slot->info)
 541                 goto error_info;
 542
 543         asus->hotplug_slot->private = asus;
 544         asus->hotplug_slot->release = &asus_cleanup_pci_hotplug;
 545         asus->hotplug_slot->ops = &asus_hotplug_slot_ops;
 546         asus_get_adapter_status(asus->hotplug_slot,
 547                                 &asus->hotplug_slot->info->adapter_status);
 548
 549         ret = pci_hp_register(asus->hotplug_slot, bus, 0, "asus-wifi");
 550         if (ret) {
 551                 pr_err("Unable to register hotplug slot - %d\n", ret);
 552                 goto error_register;
 553         }
 554
 555         return 0;
 556
 557 error_register:
 558         kfree(asus->hotplug_slot->info);
 559 error_info:
 560         kfree(asus->hotplug_slot);
 561         asus->hotplug_slot = NULL;
 562 error_slot:
 563         destroy_workqueue(asus->hotplug_workqueue);
 564 error_workqueue:
 565         return ret;
 566 }
 567
 568 /*
 569  * Rfkill devices
 570  */
 571 static int asus_rfkill_set(void *data, bool blocked)
 572 {
 573         int dev_id = (unsigned long)data;
 574         u32 ctrl_param = !blocked;
 575         acpi_status status;
 576
 577         status = asus_wmi_set_devstate(dev_id, ctrl_param, NULL);
 578
 579         if (ACPI_FAILURE(status))
 580                 return -EIO;
 581
 582         return 0;
 583 }
 584
 585 static void asus_rfkill_query(struct rfkill *rfkill, void *data)
 586 {
 587         int dev_id = (unsigned long)data;
 588         int result;
 589
 590         result = asus_wmi_get_devstate_simple(dev_id);
 591
 592         if (result < 0)
 593                 return;
 594
 595         rfkill_set_sw_state(rfkill, !result);
 596 }
 597
 598 static int asus_rfkill_wlan_set(void *data, bool blocked)
 599 {
 600         struct asus_wmi *asus = data;
 601         int ret;
 602
 603         /*
 604          * This handler is enabled only if hotplug is enabled.
 605          * In this case, the asus_wmi_set_devstate() will
 606          * trigger a wmi notification and we need to wait
 607          * this call to finish before being able to call
 608          * any wmi method
 609          */
 610         mutex_lock(&asus->wmi_lock);
 611         ret = asus_rfkill_set((void *)(long)ASUS_WMI_DEVID_WLAN, blocked);
 612         mutex_unlock(&asus->wmi_lock);
 613         return ret;
 614 }
 615
 616 static void asus_rfkill_wlan_query(struct rfkill *rfkill, void *data)
 617 {
 618         asus_rfkill_query(rfkill, (void *)(long)ASUS_WMI_DEVID_WLAN);
 619 }
 620
 621 static const struct rfkill_ops asus_rfkill_wlan_ops = {
 622         .set_block = asus_rfkill_wlan_set,
 623         .query = asus_rfkill_wlan_query,
 624 };
 625
 626 static const struct rfkill_ops asus_rfkill_ops = {
 627         .set_block = asus_rfkill_set,
 628         .query = asus_rfkill_query,
 629 };
 630
 631 static int asus_new_rfkill(struct asus_wmi *asus,
 632                            struct rfkill **rfkill,
 633                            const char *name, enum rfkill_type type, int dev_id)
 634 {
 635         int result = asus_wmi_get_devstate_simple(dev_id);
 636
 637         if (result < 0)
 638                 return result;
 639
 640         if (dev_id == ASUS_WMI_DEVID_WLAN && asus->driver->hotplug_wireless)
 641                 *rfkill = rfkill_alloc(name, &asus->platform_device->dev, type,
 642                                        &asus_rfkill_wlan_ops, asus);
 643         else
 644                 *rfkill = rfkill_alloc(name, &asus->platform_device->dev, type,
 645                                        &asus_rfkill_ops, (void *)(long)dev_id);
 646
 647         if (!*rfkill)
 648                 return -EINVAL;
 649
 650         rfkill_init_sw_state(*rfkill, !result);
 651         result = rfkill_register(*rfkill);
 652         if (result) {
 653                 rfkill_destroy(*rfkill);
 654                 *rfkill = NULL;
 655                 return result;
 656         }
 657         return 0;
 658 }
 659
 660 static void asus_wmi_rfkill_exit(struct asus_wmi *asus)
 661 {
 662         asus_unregister_rfkill_notifier(asus, "\\_SB.PCI0.P0P5");
 663         asus_unregister_rfkill_notifier(asus, "\\_SB.PCI0.P0P6");
 664         asus_unregister_rfkill_notifier(asus, "\\_SB.PCI0.P0P7");
 665         if (asus->wlan_rfkill) {
 666                 rfkill_unregister(asus->wlan_rfkill);
 667                 rfkill_destroy(asus->wlan_rfkill);
 668                 asus->wlan_rfkill = NULL;
 669         }
 670         /*
 671          * Refresh pci hotplug in case the rfkill state was changed after
 672          * asus_unregister_rfkill_notifier()
 673          */
 674         asus_rfkill_hotplug(asus);
 675         if (asus->hotplug_slot)
 676                 pci_hp_deregister(asus->hotplug_slot);
 677         if (asus->hotplug_workqueue)
 678                 destroy_workqueue(asus->hotplug_workqueue);
 679
 680         if (asus->bluetooth_rfkill) {
 681                 rfkill_unregister(asus->bluetooth_rfkill);
 682                 rfkill_destroy(asus->bluetooth_rfkill);
 683                 asus->bluetooth_rfkill = NULL;
 684         }
 685         if (asus->wimax_rfkill) {
 686                 rfkill_unregister(asus->wimax_rfkill);
 687                 rfkill_destroy(asus->wimax_rfkill);
 688                 asus->wimax_rfkill = NULL;
 689         }
 690         if (asus->wwan3g_rfkill) {
 691                 rfkill_unregister(asus->wwan3g_rfkill);
 692                 rfkill_destroy(asus->wwan3g_rfkill);
 693                 asus->wwan3g_rfkill = NULL;
 694         }
 695 }
 696
 697 static int asus_wmi_rfkill_init(struct asus_wmi *asus)
 698 {
 699         int result = 0;
 700
 701         mutex_init(&asus->hotplug_lock);
 702         mutex_init(&asus->wmi_lock);
 703
 704         result = asus_new_rfkill(asus, &asus->wlan_rfkill,
 705                                  "asus-wlan", RFKILL_TYPE_WLAN,
 706                                  ASUS_WMI_DEVID_WLAN);
 707
 708         if (result && result != -ENODEV)
 709                 goto exit;
 710
 711         result = asus_new_rfkill(asus, &asus->bluetooth_rfkill,
 712                                  "asus-bluetooth", RFKILL_TYPE_BLUETOOTH,
 713                                  ASUS_WMI_DEVID_BLUETOOTH);
 714
 715         if (result && result != -ENODEV)
 716                 goto exit;
 717
 718         result = asus_new_rfkill(asus, &asus->wimax_rfkill,
 719                                  "asus-wimax", RFKILL_TYPE_WIMAX,
 720                                  ASUS_WMI_DEVID_WIMAX);
 721
 722         if (result && result != -ENODEV)
 723                 goto exit;
 724
 725         result = asus_new_rfkill(asus, &asus->wwan3g_rfkill,
 726                                  "asus-wwan3g", RFKILL_TYPE_WWAN,
 727                                  ASUS_WMI_DEVID_WWAN3G);
 728
 729         if (result && result != -ENODEV)
 730                 goto exit;
 731
 732         if (!asus->driver->hotplug_wireless)
 733                 goto exit;
 734
 735         result = asus_setup_pci_hotplug(asus);
 736         /*
 737          * If we get -EBUSY then something else is handling the PCI hotplug -
 738          * don't fail in this case
 739          */
 740         if (result == -EBUSY)
 741                 result = 0;
 742
 743         asus_register_rfkill_notifier(asus, "\\_SB.PCI0.P0P5");
 744         asus_register_rfkill_notifier(asus, "\\_SB.PCI0.P0P6");
 745         asus_register_rfkill_notifier(asus, "\\_SB.PCI0.P0P7");
 746         /*
 747          * Refresh pci hotplug in case the rfkill state was changed during
 748          * setup.
 749          */
 750         asus_rfkill_hotplug(asus);
 751
 752 exit:
 753         if (result && result != -ENODEV)
 754                 asus_wmi_rfkill_exit(asus);
 755
 756         if (result == -ENODEV)
 757                 result = 0;
 758
 759         return result;
 760 }
 761
 762 /*
 763  * Backlight
 764  */
 765 static int read_backlight_power(void)
 766 {
 767         int ret = asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_BACKLIGHT);
 768
 769         if (ret < 0)
 770                 return ret;
 771
 772         return ret ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 773 }
 774
 775 static int read_brightness(struct backlight_device *bd)
 776 {
 777         u32 retval;
 778         acpi_status status;
 779
 780         status = asus_wmi_get_devstate(ASUS_WMI_DEVID_BRIGHTNESS, &retval);
 781
 782         if (ACPI_FAILURE(status))
 783                 return -EIO;
 784         else
 785                 return retval & ASUS_WMI_DSTS_BRIGHTNESS_MASK;
 786 }
 787
 788 static int update_bl_status(struct backlight_device *bd)
 789 {
 790         u32 ctrl_param;
 791         acpi_status status;
 792         int power;
 793
 794         ctrl_param = bd->props.brightness;
 795
 796         status = asus_wmi_set_devstate(ASUS_WMI_DEVID_BRIGHTNESS,
 797                                        ctrl_param, NULL);
 798
 799         if (ACPI_FAILURE(status))
 800                 return -EIO;
 801
 802         power = read_backlight_power();
 803         if (power != -ENODEV && bd->props.power != power) {
 804                 ctrl_param = !!(bd->props.power == FB_BLANK_UNBLANK);
 805                 status = asus_wmi_set_devstate(ASUS_WMI_DEVID_BACKLIGHT,
 806                                                ctrl_param, NULL);
 807
 808                 if (ACPI_FAILURE(status))
 809                         return -EIO;
 810         }
 811         return 0;
 812 }
 813
 814 static const struct backlight_ops asus_wmi_bl_ops = {
 815         .get_brightness = read_brightness,
 816         .update_status = update_bl_status,
 817 };
 818
 819 static int asus_wmi_backlight_notify(struct asus_wmi *asus, int code)
 820 {
 821         struct backlight_device *bd = asus->backlight_device;
 822         int old = bd->props.brightness;
 823         int new = old;
 824
 825         if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 826                 new = code - NOTIFY_BRNUP_MIN + 1;
 827         else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
 828                 new = code - NOTIFY_BRNDOWN_MIN;
 829
 830         bd->props.brightness = new;
 831         backlight_update_status(bd);
 832         backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
 833
 834         return old;
 835 }
 836
 837 static int asus_wmi_backlight_init(struct asus_wmi *asus)
 838 {
 839         struct backlight_device *bd;
 840         struct backlight_properties props;
 841         int max;
 842         int power;
 843
 844         max = asus_wmi_get_devstate_bits(ASUS_WMI_DEVID_BRIGHTNESS,
 845                                          ASUS_WMI_DSTS_MAX_BRIGTH_MASK);
 846         power = read_backlight_power();
 847
 848         if (max < 0 && power < 0) {
 849                 /* Try to keep the original error */
 850                 if (max == -ENODEV && power == -ENODEV)
 851                         return -ENODEV;
 852                 if (max != -ENODEV)
 853                         return max;
 854                 else
 855                         return power;
 856         }
 857         if (max == -ENODEV)
 858                 max = 0;
 859         if (power == -ENODEV)
 860                 power = FB_BLANK_UNBLANK;
 861
 862         memset(&props, 0, sizeof(struct backlight_properties));
 863         props.max_brightness = max;
 864         bd = backlight_device_register(asus->driver->name,
 865                                        &asus->platform_device->dev, asus,
 866                                        &asus_wmi_bl_ops, &props);
 867         if (IS_ERR(bd)) {
 868                 pr_err("Could not register backlight device\n");
 869                 return PTR_ERR(bd);
 870         }
 871
 872         asus->backlight_device = bd;
 873
 874         bd->props.brightness = read_brightness(bd);
 875         bd->props.power = power;
 876         backlight_update_status(bd);
 877
 878         return 0;
 879 }
 880
 881 static void asus_wmi_backlight_exit(struct asus_wmi *asus)
 882 {
 883         if (asus->backlight_device)
 884                 backlight_device_unregister(asus->backlight_device);
 885
 886         asus->backlight_device = NULL;
 887 }
 888
 889 static void asus_wmi_notify(u32 value, void *context)
 890 {
 891         struct asus_wmi *asus = context;
 892         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 893         union acpi_object *obj;
 894         acpi_status status;
 895         int code;
 896         int orig_code;
 897
 898         status = wmi_get_event_data(value, &response);
 899         if (status != AE_OK) {
 900                 pr_err("bad event status 0x%x\n", status);
 901                 return;
 902         }
 903
 904         obj = (union acpi_object *)response.pointer;
 905
 906         if (!obj || obj->type != ACPI_TYPE_INTEGER)
 907                 goto exit;
 908
 909         code = obj->integer.value;
 910         orig_code = code;
 911
 912         if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 913                 code = NOTIFY_BRNUP_MIN;
 914         else if (code >= NOTIFY_BRNDOWN_MIN &&
 915                  code <= NOTIFY_BRNDOWN_MAX)
 916                 code = NOTIFY_BRNDOWN_MIN;
 917
 918         if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
 919                 if (!acpi_video_backlight_support())
 920                         asus_wmi_backlight_notify(asus, orig_code);
 921         } else if (!sparse_keymap_report_event(asus->inputdev, code, 1, true))
 922                 pr_info("Unknown key %x pressed\n", code);
 923
 924 exit:
 925         kfree(obj);
 926 }
 927
 928 /*
 929  * Sys helpers
 930  */
 931 static int parse_arg(const char *buf, unsigned long count, int *val)
 932 {
 933         if (!count)
 934                 return 0;
 935         if (sscanf(buf, "%i", val) != 1)
 936                 return -EINVAL;
 937         return count;
 938 }
 939
 940 static ssize_t store_sys_wmi(int devid, const char *buf, size_t count)
 941 {
 942         acpi_status status;
 943         u32 retval;
 944         int rv, value;
 945
 946         value = asus_wmi_get_devstate_simple(devid);
 947         if (value == -ENODEV)   /* Check device presence */
 948                 return value;
 949
 950         rv = parse_arg(buf, count, &value);
 951         status = asus_wmi_set_devstate(devid, value, &retval);
 952
 953         if (ACPI_FAILURE(status))
 954                 return -EIO;
 955         return rv;
 956 }
 957
 958 static ssize_t show_sys_wmi(int devid, char *buf)
 959 {
 960         int value = asus_wmi_get_devstate_simple(devid);
 961
 962         if (value < 0)
 963                 return value;
 964
 965         return sprintf(buf, "%d\n", value);
 966 }
 967
 968 #define ASUS_WMI_CREATE_DEVICE_ATTR(_name, _mode, _cm)                  \
 969         static ssize_t show_##_name(struct device *dev,                 \
 970                                     struct device_attribute *attr,      \
 971                                     char *buf)                          \
 972         {                                                               \
 973                 return show_sys_wmi(_cm, buf);                          \
 974         }                                                               \
 975         static ssize_t store_##_name(struct device *dev,                \
 976                                      struct device_attribute *attr,     \
 977                                      const char *buf, size_t count)     \
 978         {                                                               \
 979                 return store_sys_wmi(_cm, buf, count);                  \
 980         }                                                               \
 981         static struct device_attribute dev_attr_##_name = {             \
 982                 .attr = {                                               \
 983                         .name = __stringify(_name),                     \
 984                         .mode = _mode },                                \
 985                 .show   = show_##_name,                                 \
 986                 .store  = store_##_name,                                \
 987         }
 988
 989 ASUS_WMI_CREATE_DEVICE_ATTR(touchpad, 0644, ASUS_WMI_DEVID_TOUCHPAD);
 990 ASUS_WMI_CREATE_DEVICE_ATTR(camera, 0644, ASUS_WMI_DEVID_CAMERA);
 991 ASUS_WMI_CREATE_DEVICE_ATTR(cardr, 0644, ASUS_WMI_DEVID_CARDREADER);
 992
 993 static ssize_t store_cpufv(struct device *dev, struct device_attribute *attr,
 994                            const char *buf, size_t count)
 995 {
 996         int value;
 997         struct acpi_buffer input = { (acpi_size) sizeof(value), &value };
 998         acpi_status status;
 999
1000         if (!count || sscanf(buf, "%i", &value) != 1)
1001                 return -EINVAL;
1002         if (value < 0 || value > 2)
1003                 return -EINVAL;
1004
1005         status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID,
1006                                      1, ASUS_WMI_METHODID_CFVS, &input, NULL);
1007
1008         if (ACPI_FAILURE(status))
1009                 return -EIO;
1010         else
1011                 return count;
1012 }
1013
1014 static DEVICE_ATTR(cpufv, S_IRUGO | S_IWUSR, NULL, store_cpufv);
1015
1016 static struct attribute *platform_attributes[] = {
1017         &dev_attr_cpufv.attr,
1018         &dev_attr_camera.attr,
1019         &dev_attr_cardr.attr,
1020         &dev_attr_touchpad.attr,
1021         NULL
1022 };
1023
1024 static mode_t asus_sysfs_is_visible(struct kobject *kobj,
1025                                     struct attribute *attr, int idx)
1026 {
1027         bool supported = true;
1028         int devid = -1;
1029
1030         if (attr == &dev_attr_camera.attr)
1031                 devid = ASUS_WMI_DEVID_CAMERA;
1032         else if (attr == &dev_attr_cardr.attr)
1033                 devid = ASUS_WMI_DEVID_CARDREADER;
1034         else if (attr == &dev_attr_touchpad.attr)
1035                 devid = ASUS_WMI_DEVID_TOUCHPAD;
1036
1037         if (devid != -1)
1038                 supported = asus_wmi_get_devstate_simple(devid) != -ENODEV;
1039
1040         return supported ? attr->mode : 0;
1041 }
1042
1043 static struct attribute_group platform_attribute_group = {
1044         .is_visible = asus_sysfs_is_visible,
1045         .attrs = platform_attributes
1046 };
1047
1048 static void asus_wmi_sysfs_exit(struct platform_device *device)
1049 {
1050         sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
1051 }
1052
1053 static int asus_wmi_sysfs_init(struct platform_device *device)
1054 {
1055         return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
1056 }
1057
1058 /*
1059  * Platform device
1060  */
1061 static int __init asus_wmi_platform_init(struct asus_wmi *asus)
1062 {
1063         return asus_wmi_sysfs_init(asus->platform_device);
1064 }
1065
1066 static void asus_wmi_platform_exit(struct asus_wmi *asus)
1067 {
1068         asus_wmi_sysfs_exit(asus->platform_device);
1069 }
1070
1071 /*
1072  * debugfs
1073  */
1074 struct asus_wmi_debugfs_node {
1075         struct asus_wmi *asus;
1076         char *name;
1077         int (*show) (struct seq_file *m, void *data);
1078 };
1079
1080 static int show_dsts(struct seq_file *m, void *data)
1081 {
1082         struct asus_wmi *asus = m->private;
1083         acpi_status status;
1084         u32 retval = -1;
1085
1086         status = asus_wmi_get_devstate(asus->debug.dev_id, &retval);
1087
1088         if (ACPI_FAILURE(status))
1089                 return -EIO;
1090
1091         seq_printf(m, "DSTS(%x) = %x\n", asus->debug.dev_id, retval);
1092
1093         return 0;
1094 }
1095
1096 static int show_devs(struct seq_file *m, void *data)
1097 {
1098         struct asus_wmi *asus = m->private;
1099         acpi_status status;
1100         u32 retval = -1;
1101
1102         status = asus_wmi_set_devstate(asus->debug.dev_id,
1103                                        asus->debug.ctrl_param, &retval);
1104         if (ACPI_FAILURE(status))
1105                 return -EIO;
1106
1107         seq_printf(m, "DEVS(%x, %x) = %x\n", asus->debug.dev_id,
1108                    asus->debug.ctrl_param, retval);
1109
1110         return 0;
1111 }
1112
1113 static struct asus_wmi_debugfs_node asus_wmi_debug_files[] = {
1114         {NULL, "devs", show_devs},
1115         {NULL, "dsts", show_dsts},
1116 };
1117
1118 static int asus_wmi_debugfs_open(struct inode *inode, struct file *file)
1119 {
1120         struct asus_wmi_debugfs_node *node = inode->i_private;
1121
1122         return single_open(file, node->show, node->asus);
1123 }
1124
1125 static const struct file_operations asus_wmi_debugfs_io_ops = {
1126         .owner = THIS_MODULE,
1127         .open = asus_wmi_debugfs_open,
1128         .read = seq_read,
1129         .llseek = seq_lseek,
1130         .release = single_release,
1131 };
1132
1133 static void asus_wmi_debugfs_exit(struct asus_wmi *asus)
1134 {
1135         debugfs_remove_recursive(asus->debug.root);
1136 }
1137
1138 static int asus_wmi_debugfs_init(struct asus_wmi *asus)
1139 {
1140         struct dentry *dent;
1141         int i;
1142
1143         asus->debug.root = debugfs_create_dir(asus->driver->name, NULL);
1144         if (!asus->debug.root) {
1145                 pr_err("failed to create debugfs directory");
1146                 goto error_debugfs;
1147         }
1148
1149         dent = debugfs_create_x32("dev_id", S_IRUGO | S_IWUSR,
1150                                   asus->debug.root, &asus->debug.dev_id);
1151         if (!dent)
1152                 goto error_debugfs;
1153
1154         dent = debugfs_create_x32("ctrl_param", S_IRUGO | S_IWUSR,
1155                                   asus->debug.root, &asus->debug.ctrl_param);
1156         if (!dent)
1157                 goto error_debugfs;
1158
1159         for (i = 0; i < ARRAY_SIZE(asus_wmi_debug_files); i++) {
1160                 struct asus_wmi_debugfs_node *node = &asus_wmi_debug_files[i];
1161
1162                 node->asus = asus;
1163                 dent = debugfs_create_file(node->name, S_IFREG | S_IRUGO,
1164                                            asus->debug.root, node,
1165                                            &asus_wmi_debugfs_io_ops);
1166                 if (!dent) {
1167                         pr_err("failed to create debug file: %s\n", node->name);
1168                         goto error_debugfs;
1169                 }
1170         }
1171
1172         return 0;
1173
1174 error_debugfs:
1175         asus_wmi_debugfs_exit(asus);
1176         return -ENOMEM;
1177 }
1178
1179 /*
1180  * WMI Driver
1181  */
1182 static int asus_wmi_add(struct platform_device *pdev)
1183 {
1184         struct platform_driver *pdrv = to_platform_driver(pdev->dev.driver);
1185         struct asus_wmi_driver *wdrv = to_asus_wmi_driver(pdrv);
1186         struct asus_wmi *asus;
1187         acpi_status status;
1188         int err;
1189
1190         asus = kzalloc(sizeof(struct asus_wmi), GFP_KERNEL);
1191         if (!asus)
1192                 return -ENOMEM;
1193
1194         asus->driver = wdrv;
1195         asus->platform_device = pdev;
1196         wdrv->platform_device = pdev;
1197         platform_set_drvdata(asus->platform_device, asus);
1198
1199         if (wdrv->quirks)
1200                 wdrv->quirks(asus->driver);
1201
1202         err = asus_wmi_platform_init(asus);
1203         if (err)
1204                 goto fail_platform;
1205
1206         err = asus_wmi_input_init(asus);
1207         if (err)
1208                 goto fail_input;
1209
1210         err = asus_wmi_led_init(asus);
1211         if (err)
1212                 goto fail_leds;
1213
1214         err = asus_wmi_rfkill_init(asus);
1215         if (err)
1216                 goto fail_rfkill;
1217
1218         if (!acpi_video_backlight_support()) {
1219                 err = asus_wmi_backlight_init(asus);
1220                 if (err && err != -ENODEV)
1221                         goto fail_backlight;
1222         } else
1223                 pr_info("Backlight controlled by ACPI video driver\n");
1224
1225         status = wmi_install_notify_handler(asus->driver->event_guid,
1226                                             asus_wmi_notify, asus);
1227         if (ACPI_FAILURE(status)) {
1228                 pr_err("Unable to register notify handler - %d\n", status);
1229                 err = -ENODEV;
1230                 goto fail_wmi_handler;
1231         }
1232
1233         err = asus_wmi_debugfs_init(asus);
1234         if (err)
1235                 goto fail_debugfs;
1236
1237         return 0;
1238
1239 fail_debugfs:
1240         wmi_remove_notify_handler(asus->driver->event_guid);
1241 fail_wmi_handler:
1242         asus_wmi_backlight_exit(asus);
1243 fail_backlight:
1244         asus_wmi_rfkill_exit(asus);
1245 fail_rfkill:
1246         asus_wmi_led_exit(asus);
1247 fail_leds:
1248         asus_wmi_input_exit(asus);
1249 fail_input:
1250         asus_wmi_platform_exit(asus);
1251 fail_platform:
1252         kfree(asus);
1253         return err;
1254 }
1255
1256 static int asus_wmi_remove(struct platform_device *device)
1257 {
1258         struct asus_wmi *asus;
1259
1260         asus = platform_get_drvdata(device);
1261         wmi_remove_notify_handler(asus->driver->event_guid);
1262         asus_wmi_backlight_exit(asus);
1263         asus_wmi_input_exit(asus);
1264         asus_wmi_led_exit(asus);
1265         asus_wmi_rfkill_exit(asus);
1266         asus_wmi_debugfs_exit(asus);
1267         asus_wmi_platform_exit(asus);
1268
1269         kfree(asus);
1270         return 0;
1271 }
1272
1273 /*
1274  * Platform driver - hibernate/resume callbacks
1275  */
1276 static int asus_hotk_thaw(struct device *device)
1277 {
1278         struct asus_wmi *asus = dev_get_drvdata(device);
1279
1280         if (asus->wlan_rfkill) {
1281                 bool wlan;
1282
1283                 /*
1284                  * Work around bios bug - acpi _PTS turns off the wireless led
1285                  * during suspend.  Normally it restores it on resume, but
1286                  * we should kick it ourselves in case hibernation is aborted.
1287                  */
1288                 wlan = asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_WLAN);
1289                 asus_wmi_set_devstate(ASUS_WMI_DEVID_WLAN, wlan, NULL);
1290         }
1291
1292         return 0;
1293 }
1294
1295 static int asus_hotk_restore(struct device *device)
1296 {
1297         struct asus_wmi *asus = dev_get_drvdata(device);
1298         int bl;
1299
1300         /* Refresh both wlan rfkill state and pci hotplug */
1301         if (asus->wlan_rfkill)
1302                 asus_rfkill_hotplug(asus);
1303
1304         if (asus->bluetooth_rfkill) {
1305                 bl = !asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_BLUETOOTH);
1306                 rfkill_set_sw_state(asus->bluetooth_rfkill, bl);
1307         }
1308         if (asus->wimax_rfkill) {
1309                 bl = !asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_WIMAX);
1310                 rfkill_set_sw_state(asus->wimax_rfkill, bl);
1311         }
1312         if (asus->wwan3g_rfkill) {
1313                 bl = !asus_wmi_get_devstate_simple(ASUS_WMI_DEVID_WWAN3G);
1314                 rfkill_set_sw_state(asus->wwan3g_rfkill, bl);
1315         }
1316
1317         return 0;
1318 }
1319
1320 static const struct dev_pm_ops asus_pm_ops = {
1321         .thaw = asus_hotk_thaw,
1322         .restore = asus_hotk_restore,
1323 };
1324
1325 static int asus_wmi_probe(struct platform_device *pdev)
1326 {
1327         struct platform_driver *pdrv = to_platform_driver(pdev->dev.driver);
1328         struct asus_wmi_driver *wdrv = to_asus_wmi_driver(pdrv);
1329         int ret;
1330
1331         if (!wmi_has_guid(ASUS_WMI_MGMT_GUID)) {
1332                 pr_warning("Management GUID not found\n");
1333                 return -ENODEV;
1334         }
1335
1336         if (wdrv->event_guid && !wmi_has_guid(wdrv->event_guid)) {
1337                 pr_warning("Event GUID not found\n");
1338                 return -ENODEV;
1339         }
1340
1341         if (wdrv->probe) {
1342                 ret = wdrv->probe(pdev);
1343                 if (ret)
1344                         return ret;
1345         }
1346
1347         return asus_wmi_add(pdev);
1348 }
1349
1350 static bool used;
1351
1352 int asus_wmi_register_driver(struct asus_wmi_driver *driver)
1353 {
1354         struct platform_driver *platform_driver;
1355         struct platform_device *platform_device;
1356
1357         if (used)
1358                 return -EBUSY;
1359
1360         platform_driver = &driver->platform_driver;
1361         platform_driver->remove = asus_wmi_remove;
1362         platform_driver->driver.owner = driver->owner;
1363         platform_driver->driver.name = driver->name;
1364         platform_driver->driver.pm = &asus_pm_ops;
1365
1366         platform_device = platform_create_bundle(platform_driver,
1367                                                  asus_wmi_probe,
1368                                                  NULL, 0, NULL, 0);
1369         if (IS_ERR(platform_device))
1370                 return PTR_ERR(platform_device);
1371
1372         used = true;
1373         return 0;
1374 }
1375 EXPORT_SYMBOL_GPL(asus_wmi_register_driver);
1376
1377 void asus_wmi_unregister_driver(struct asus_wmi_driver *driver)
1378 {
1379         platform_device_unregister(driver->platform_device);
1380         platform_driver_unregister(&driver->platform_driver);
1381         used = false;
1382 }
1383 EXPORT_SYMBOL_GPL(asus_wmi_unregister_driver);
1384
1385 static int __init asus_wmi_init(void)
1386 {
1387         if (!wmi_has_guid(ASUS_WMI_MGMT_GUID)) {
1388                 pr_info("Asus Management GUID not found");
1389                 return -ENODEV;
1390         }
1391
1392         pr_info("ASUS WMI generic driver loaded");
1393         return 0;
1394 }
1395
1396 static void __exit asus_wmi_exit(void)
1397 {
1398         pr_info("ASUS WMI generic driver unloaded");
1399 }
1400
1401 module_init(asus_wmi_init);
1402 module_exit(asus_wmi_exit);