drivers/platform/x86/eeepc-wmi.c

   1 /*
   2  * Eee PC WMI hotkey driver
   3  *
   4  * Copyright(C) 2010 Intel Corporation.
   5  * Copyright(C) 2010 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 <linux/dmi.h>
  46 #include <acpi/acpi_bus.h>
  47 #include <acpi/acpi_drivers.h>
  48
  49 #define EEEPC_WMI_FILE  "eeepc-wmi"
  50
  51 MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>");
  52 MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
  53 MODULE_LICENSE("GPL");
  54
  55 #define EEEPC_ACPI_HID          "ASUS010" /* old _HID used in eeepc-laptop */
  56
  57 #define EEEPC_WMI_EVENT_GUID    "ABBC0F72-8EA1-11D1-00A0-C90629100000"
  58 #define EEEPC_WMI_MGMT_GUID     "97845ED0-4E6D-11DE-8A39-0800200C9A66"
  59
  60 MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
  61 MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
  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 #define EEEPC_WMI_METHODID_DEVS 0x53564544
  69 #define EEEPC_WMI_METHODID_DSTS 0x53544344
  70 #define EEEPC_WMI_METHODID_CFVS 0x53564643
  71
  72 #define EEEPC_WMI_DEVID_BACKLIGHT       0x00050012
  73 #define EEEPC_WMI_DEVID_TPDLED          0x00100011
  74 #define EEEPC_WMI_DEVID_WLAN            0x00010011
  75 #define EEEPC_WMI_DEVID_BLUETOOTH       0x00010013
  76 #define EEEPC_WMI_DEVID_WWAN3G          0x00010019
  77
  78 static bool hotplug_wireless;
  79
  80 module_param(hotplug_wireless, bool, 0444);
  81 MODULE_PARM_DESC(hotplug_wireless,
  82                  "Enable hotplug for wireless device. "
  83                  "If your laptop needs that, please report to "
  84                  "acpi4asus-user@lists.sourceforge.net.");
  85
  86 static const struct key_entry eeepc_wmi_keymap[] = {
  87         /* Sleep already handled via generic ACPI code */
  88         { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } },
  89         { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } },
  90         { KE_KEY, 0x30, { KEY_VOLUMEUP } },
  91         { KE_KEY, 0x31, { KEY_VOLUMEDOWN } },
  92         { KE_KEY, 0x32, { KEY_MUTE } },
  93         { KE_KEY, 0x5c, { KEY_F15 } },
  94         { KE_KEY, 0x5d, { KEY_WLAN } },
  95         { KE_KEY, 0x6b, { KEY_F13 } }, /* Disable Touchpad */
  96         { KE_KEY, 0x88, { KEY_WLAN } },
  97         { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } },
  98         { KE_KEY, 0xe0, { KEY_PROG1 } },
  99         { KE_KEY, 0xe1, { KEY_F14 } },
 100         { KE_KEY, 0xe9, { KEY_DISPLAY_OFF } },
 101         { KE_END, 0},
 102 };
 103
 104 struct bios_args {
 105         u32     dev_id;
 106         u32     ctrl_param;
 107 };
 108
 109 /*
 110  * eeepc-wmi/    - debugfs root directory
 111  *   dev_id      - current dev_id
 112  *   ctrl_param  - current ctrl_param
 113  *   devs        - call DEVS(dev_id, ctrl_param) and print result
 114  *   dsts        - call DSTS(dev_id)  and print result
 115  */
 116 struct eeepc_wmi_debug {
 117         struct dentry *root;
 118         u32 dev_id;
 119         u32 ctrl_param;
 120 };
 121
 122 struct eeepc_wmi {
 123         bool hotplug_wireless;
 124
 125         struct input_dev *inputdev;
 126         struct backlight_device *backlight_device;
 127         struct platform_device *platform_device;
 128
 129         struct led_classdev tpd_led;
 130         int tpd_led_wk;
 131         struct workqueue_struct *led_workqueue;
 132         struct work_struct tpd_led_work;
 133
 134         struct rfkill *wlan_rfkill;
 135         struct rfkill *bluetooth_rfkill;
 136         struct rfkill *wwan3g_rfkill;
 137
 138         struct hotplug_slot *hotplug_slot;
 139         struct mutex hotplug_lock;
 140         struct mutex wmi_lock;
 141         struct workqueue_struct *hotplug_workqueue;
 142         struct work_struct hotplug_work;
 143
 144         struct eeepc_wmi_debug debug;
 145 };
 146
 147 /* Only used in eeepc_wmi_init() and eeepc_wmi_exit() */
 148 static struct platform_device *platform_device;
 149
 150 static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
 151 {
 152         int err;
 153
 154         eeepc->inputdev = input_allocate_device();
 155         if (!eeepc->inputdev)
 156                 return -ENOMEM;
 157
 158         eeepc->inputdev->name = "Eee PC WMI hotkeys";
 159         eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0";
 160         eeepc->inputdev->id.bustype = BUS_HOST;
 161         eeepc->inputdev->dev.parent = &eeepc->platform_device->dev;
 162
 163         err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL);
 164         if (err)
 165                 goto err_free_dev;
 166
 167         err = input_register_device(eeepc->inputdev);
 168         if (err)
 169                 goto err_free_keymap;
 170
 171         return 0;
 172
 173 err_free_keymap:
 174         sparse_keymap_free(eeepc->inputdev);
 175 err_free_dev:
 176         input_free_device(eeepc->inputdev);
 177         return err;
 178 }
 179
 180 static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
 181 {
 182         if (eeepc->inputdev) {
 183                 sparse_keymap_free(eeepc->inputdev);
 184                 input_unregister_device(eeepc->inputdev);
 185         }
 186
 187         eeepc->inputdev = NULL;
 188 }
 189
 190 static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *retval)
 191 {
 192         struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
 193         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 194         union acpi_object *obj;
 195         acpi_status status;
 196         u32 tmp;
 197
 198         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 199                                      1, EEEPC_WMI_METHODID_DSTS,
 200                                      &input, &output);
 201
 202         if (ACPI_FAILURE(status))
 203                 return status;
 204
 205         obj = (union acpi_object *)output.pointer;
 206         if (obj && obj->type == ACPI_TYPE_INTEGER)
 207                 tmp = (u32)obj->integer.value;
 208         else
 209                 tmp = 0;
 210
 211         if (retval)
 212                 *retval = tmp;
 213
 214         kfree(obj);
 215
 216         return status;
 217
 218 }
 219
 220 static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param,
 221                                           u32 *retval)
 222 {
 223         struct bios_args args = {
 224                 .dev_id = dev_id,
 225                 .ctrl_param = ctrl_param,
 226         };
 227         struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
 228         acpi_status status;
 229
 230         if (!retval) {
 231                 status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 1,
 232                                              EEEPC_WMI_METHODID_DEVS,
 233                                              &input, NULL);
 234         } else {
 235                 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 236                 union acpi_object *obj;
 237                 u32 tmp;
 238
 239                 status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 1,
 240                                              EEEPC_WMI_METHODID_DEVS,
 241                                              &input, &output);
 242
 243                 if (ACPI_FAILURE(status))
 244                         return status;
 245
 246                 obj = (union acpi_object *)output.pointer;
 247                 if (obj && obj->type == ACPI_TYPE_INTEGER)
 248                         tmp = (u32)obj->integer.value;
 249                 else
 250                         tmp = 0;
 251
 252                 *retval = tmp;
 253
 254                 kfree(obj);
 255         }
 256
 257         return status;
 258 }
 259
 260 /* Helper for special devices with magic return codes */
 261 static int eeepc_wmi_get_devstate_simple(u32 dev_id)
 262 {
 263         u32 retval = 0;
 264         acpi_status status;
 265
 266         status = eeepc_wmi_get_devstate(dev_id, &retval);
 267
 268         if (ACPI_FAILURE(status))
 269                 return -EINVAL;
 270
 271         /* If the device is present, DSTS will always set some bits
 272          * 0x00070000 - 1110000000000000000 - device supported
 273          * 0x00060000 - 1100000000000000000 - not supported
 274          * 0x00020000 - 0100000000000000000 - device supported
 275          * 0x00010000 - 0010000000000000000 - not supported / special mode ?
 276          */
 277         if (!retval || retval == 0x00060000)
 278                 return -ENODEV;
 279
 280         return retval & 0x1;
 281 }
 282
 283 /*
 284  * LEDs
 285  */
 286 /*
 287  * These functions actually update the LED's, and are called from a
 288  * workqueue. By doing this as separate work rather than when the LED
 289  * subsystem asks, we avoid messing with the Eeepc ACPI stuff during a
 290  * potentially bad time, such as a timer interrupt.
 291  */
 292 static void tpd_led_update(struct work_struct *work)
 293 {
 294         int ctrl_param;
 295         struct eeepc_wmi *eeepc;
 296
 297         eeepc = container_of(work, struct eeepc_wmi, tpd_led_work);
 298
 299         ctrl_param = eeepc->tpd_led_wk;
 300         eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_TPDLED, ctrl_param, NULL);
 301 }
 302
 303 static void tpd_led_set(struct led_classdev *led_cdev,
 304                         enum led_brightness value)
 305 {
 306         struct eeepc_wmi *eeepc;
 307
 308         eeepc = container_of(led_cdev, struct eeepc_wmi, tpd_led);
 309
 310         eeepc->tpd_led_wk = !!value;
 311         queue_work(eeepc->led_workqueue, &eeepc->tpd_led_work);
 312 }
 313
 314 static int read_tpd_state(struct eeepc_wmi *eeepc)
 315 {
 316         return eeepc_wmi_get_devstate_simple(EEEPC_WMI_DEVID_TPDLED);
 317 }
 318
 319 static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
 320 {
 321         struct eeepc_wmi *eeepc;
 322
 323         eeepc = container_of(led_cdev, struct eeepc_wmi, tpd_led);
 324
 325         return read_tpd_state(eeepc);
 326 }
 327
 328 static int eeepc_wmi_led_init(struct eeepc_wmi *eeepc)
 329 {
 330         int rv;
 331
 332         if (read_tpd_state(eeepc) < 0)
 333                 return 0;
 334
 335         eeepc->led_workqueue = create_singlethread_workqueue("led_workqueue");
 336         if (!eeepc->led_workqueue)
 337                 return -ENOMEM;
 338         INIT_WORK(&eeepc->tpd_led_work, tpd_led_update);
 339
 340         eeepc->tpd_led.name = "eeepc::touchpad";
 341         eeepc->tpd_led.brightness_set = tpd_led_set;
 342         eeepc->tpd_led.brightness_get = tpd_led_get;
 343         eeepc->tpd_led.max_brightness = 1;
 344
 345         rv = led_classdev_register(&eeepc->platform_device->dev,
 346                                    &eeepc->tpd_led);
 347         if (rv) {
 348                 destroy_workqueue(eeepc->led_workqueue);
 349                 return rv;
 350         }
 351
 352         return 0;
 353 }
 354
 355 static void eeepc_wmi_led_exit(struct eeepc_wmi *eeepc)
 356 {
 357         if (eeepc->tpd_led.dev)
 358                 led_classdev_unregister(&eeepc->tpd_led);
 359         if (eeepc->led_workqueue)
 360                 destroy_workqueue(eeepc->led_workqueue);
 361 }
 362
 363 /*
 364  * PCI hotplug (for wlan rfkill)
 365  */
 366 static bool eeepc_wlan_rfkill_blocked(struct eeepc_wmi *eeepc)
 367 {
 368         int result = eeepc_wmi_get_devstate_simple(EEEPC_WMI_DEVID_WLAN);
 369
 370         if (result < 0)
 371                 return false;
 372         return !result;
 373 }
 374
 375 static void eeepc_rfkill_hotplug(struct eeepc_wmi *eeepc)
 376 {
 377         struct pci_dev *dev;
 378         struct pci_bus *bus;
 379         bool blocked;
 380         bool absent;
 381         u32 l;
 382
 383         mutex_lock(&eeepc->wmi_lock);
 384         blocked = eeepc_wlan_rfkill_blocked(eeepc);
 385         mutex_unlock(&eeepc->wmi_lock);
 386
 387         mutex_lock(&eeepc->hotplug_lock);
 388
 389         if (eeepc->wlan_rfkill)
 390                 rfkill_set_sw_state(eeepc->wlan_rfkill, blocked);
 391
 392         if (eeepc->hotplug_slot) {
 393                 bus = pci_find_bus(0, 1);
 394                 if (!bus) {
 395                         pr_warning("Unable to find PCI bus 1?\n");
 396                         goto out_unlock;
 397                 }
 398
 399                 if (pci_bus_read_config_dword(bus, 0, PCI_VENDOR_ID, &l)) {
 400                         pr_err("Unable to read PCI config space?\n");
 401                         goto out_unlock;
 402                 }
 403                 absent = (l == 0xffffffff);
 404
 405                 if (blocked != absent) {
 406                         pr_warning("BIOS says wireless lan is %s, "
 407                                         "but the pci device is %s\n",
 408                                 blocked ? "blocked" : "unblocked",
 409                                 absent ? "absent" : "present");
 410                         pr_warning("skipped wireless hotplug as probably "
 411                                         "inappropriate for this model\n");
 412                         goto out_unlock;
 413                 }
 414
 415                 if (!blocked) {
 416                         dev = pci_get_slot(bus, 0);
 417                         if (dev) {
 418                                 /* Device already present */
 419                                 pci_dev_put(dev);
 420                                 goto out_unlock;
 421                         }
 422                         dev = pci_scan_single_device(bus, 0);
 423                         if (dev) {
 424                                 pci_bus_assign_resources(bus);
 425                                 if (pci_bus_add_device(dev))
 426                                         pr_err("Unable to hotplug wifi\n");
 427                         }
 428                 } else {
 429                         dev = pci_get_slot(bus, 0);
 430                         if (dev) {
 431                                 pci_remove_bus_device(dev);
 432                                 pci_dev_put(dev);
 433                         }
 434                 }
 435         }
 436
 437 out_unlock:
 438         mutex_unlock(&eeepc->hotplug_lock);
 439 }
 440
 441 static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
 442 {
 443         struct eeepc_wmi *eeepc = data;
 444
 445         if (event != ACPI_NOTIFY_BUS_CHECK)
 446                 return;
 447
 448         /*
 449          * We can't call directly eeepc_rfkill_hotplug because most
 450          * of the time WMBC is still being executed and not reetrant.
 451          * There is currently no way to tell ACPICA that  we want this
 452          * method to be serialized, we schedule a eeepc_rfkill_hotplug
 453          * call later, in a safer context.
 454          */
 455         queue_work(eeepc->hotplug_workqueue, &eeepc->hotplug_work);
 456 }
 457
 458 static int eeepc_register_rfkill_notifier(struct eeepc_wmi *eeepc,
 459                                           char *node)
 460 {
 461         acpi_status status;
 462         acpi_handle handle;
 463
 464         status = acpi_get_handle(NULL, node, &handle);
 465
 466         if (ACPI_SUCCESS(status)) {
 467                 status = acpi_install_notify_handler(handle,
 468                                                      ACPI_SYSTEM_NOTIFY,
 469                                                      eeepc_rfkill_notify,
 470                                                      eeepc);
 471                 if (ACPI_FAILURE(status))
 472                         pr_warning("Failed to register notify on %s\n", node);
 473         } else
 474                 return -ENODEV;
 475
 476         return 0;
 477 }
 478
 479 static void eeepc_unregister_rfkill_notifier(struct eeepc_wmi *eeepc,
 480                                              char *node)
 481 {
 482         acpi_status status = AE_OK;
 483         acpi_handle handle;
 484
 485         status = acpi_get_handle(NULL, node, &handle);
 486
 487         if (ACPI_SUCCESS(status)) {
 488                 status = acpi_remove_notify_handler(handle,
 489                                                      ACPI_SYSTEM_NOTIFY,
 490                                                      eeepc_rfkill_notify);
 491                 if (ACPI_FAILURE(status))
 492                         pr_err("Error removing rfkill notify handler %s\n",
 493                                 node);
 494         }
 495 }
 496
 497 static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
 498                                     u8 *value)
 499 {
 500         int result = eeepc_wmi_get_devstate_simple(EEEPC_WMI_DEVID_WLAN);
 501
 502         if (result < 0)
 503                 return result;
 504
 505         *value = !!result;
 506         return 0;
 507 }
 508
 509 static void eeepc_cleanup_pci_hotplug(struct hotplug_slot *hotplug_slot)
 510 {
 511         kfree(hotplug_slot->info);
 512         kfree(hotplug_slot);
 513 }
 514
 515 static struct hotplug_slot_ops eeepc_hotplug_slot_ops = {
 516         .owner = THIS_MODULE,
 517         .get_adapter_status = eeepc_get_adapter_status,
 518         .get_power_status = eeepc_get_adapter_status,
 519 };
 520
 521 static void eeepc_hotplug_work(struct work_struct *work)
 522 {
 523         struct eeepc_wmi *eeepc;
 524
 525         eeepc = container_of(work, struct eeepc_wmi, hotplug_work);
 526         eeepc_rfkill_hotplug(eeepc);
 527 }
 528
 529 static int eeepc_setup_pci_hotplug(struct eeepc_wmi *eeepc)
 530 {
 531         int ret = -ENOMEM;
 532         struct pci_bus *bus = pci_find_bus(0, 1);
 533
 534         if (!bus) {
 535                 pr_err("Unable to find wifi PCI bus\n");
 536                 return -ENODEV;
 537         }
 538
 539         eeepc->hotplug_workqueue =
 540                 create_singlethread_workqueue("hotplug_workqueue");
 541         if (!eeepc->hotplug_workqueue)
 542                 goto error_workqueue;
 543
 544         INIT_WORK(&eeepc->hotplug_work, eeepc_hotplug_work);
 545
 546         eeepc->hotplug_slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
 547         if (!eeepc->hotplug_slot)
 548                 goto error_slot;
 549
 550         eeepc->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
 551                                             GFP_KERNEL);
 552         if (!eeepc->hotplug_slot->info)
 553                 goto error_info;
 554
 555         eeepc->hotplug_slot->private = eeepc;
 556         eeepc->hotplug_slot->release = &eeepc_cleanup_pci_hotplug;
 557         eeepc->hotplug_slot->ops = &eeepc_hotplug_slot_ops;
 558         eeepc_get_adapter_status(eeepc->hotplug_slot,
 559                                  &eeepc->hotplug_slot->info->adapter_status);
 560
 561         ret = pci_hp_register(eeepc->hotplug_slot, bus, 0, "eeepc-wifi");
 562         if (ret) {
 563                 pr_err("Unable to register hotplug slot - %d\n", ret);
 564                 goto error_register;
 565         }
 566
 567         return 0;
 568
 569 error_register:
 570         kfree(eeepc->hotplug_slot->info);
 571 error_info:
 572         kfree(eeepc->hotplug_slot);
 573         eeepc->hotplug_slot = NULL;
 574 error_slot:
 575         destroy_workqueue(eeepc->hotplug_workqueue);
 576 error_workqueue:
 577         return ret;
 578 }
 579
 580 /*
 581  * Rfkill devices
 582  */
 583 static int eeepc_rfkill_set(void *data, bool blocked)
 584 {
 585         int dev_id = (unsigned long)data;
 586         u32 ctrl_param = !blocked;
 587         acpi_status status;
 588
 589         status = eeepc_wmi_set_devstate(dev_id, ctrl_param, NULL);
 590
 591         if (ACPI_FAILURE(status))
 592                 return -EIO;
 593
 594         return 0;
 595 }
 596
 597 static void eeepc_rfkill_query(struct rfkill *rfkill, void *data)
 598 {
 599         int dev_id = (unsigned long)data;
 600         int result;
 601
 602         result = eeepc_wmi_get_devstate_simple(dev_id);
 603
 604         if (result < 0)
 605                 return ;
 606
 607         rfkill_set_sw_state(rfkill, !result);
 608 }
 609
 610 static int eeepc_rfkill_wlan_set(void *data, bool blocked)
 611 {
 612         struct eeepc_wmi *eeepc = data;
 613         int ret;
 614
 615         /*
 616          * This handler is enabled only if hotplug is enabled.
 617          * In this case, the eeepc_wmi_set_devstate() will
 618          * trigger a wmi notification and we need to wait
 619          * this call to finish before being able to call
 620          * any wmi method
 621          */
 622         mutex_lock(&eeepc->wmi_lock);
 623         ret = eeepc_rfkill_set((void *)(long)EEEPC_WMI_DEVID_WLAN, blocked);
 624         mutex_unlock(&eeepc->wmi_lock);
 625         return ret;
 626 }
 627
 628 static void eeepc_rfkill_wlan_query(struct rfkill *rfkill, void *data)
 629 {
 630         eeepc_rfkill_query(rfkill, (void *)(long)EEEPC_WMI_DEVID_WLAN);
 631 }
 632
 633 static const struct rfkill_ops eeepc_rfkill_wlan_ops = {
 634         .set_block = eeepc_rfkill_wlan_set,
 635         .query = eeepc_rfkill_wlan_query,
 636 };
 637
 638 static const struct rfkill_ops eeepc_rfkill_ops = {
 639         .set_block = eeepc_rfkill_set,
 640         .query = eeepc_rfkill_query,
 641 };
 642
 643 static int eeepc_new_rfkill(struct eeepc_wmi *eeepc,
 644                             struct rfkill **rfkill,
 645                             const char *name,
 646                             enum rfkill_type type, int dev_id)
 647 {
 648         int result = eeepc_wmi_get_devstate_simple(dev_id);
 649
 650         if (result < 0)
 651                 return result;
 652
 653         if (dev_id == EEEPC_WMI_DEVID_WLAN && eeepc->hotplug_wireless)
 654                 *rfkill = rfkill_alloc(name, &eeepc->platform_device->dev, type,
 655                                        &eeepc_rfkill_wlan_ops, eeepc);
 656         else
 657                 *rfkill = rfkill_alloc(name, &eeepc->platform_device->dev, type,
 658                                        &eeepc_rfkill_ops, (void *)(long)dev_id);
 659
 660         if (!*rfkill)
 661                 return -EINVAL;
 662
 663         rfkill_init_sw_state(*rfkill, !result);
 664         result = rfkill_register(*rfkill);
 665         if (result) {
 666                 rfkill_destroy(*rfkill);
 667                 *rfkill = NULL;
 668                 return result;
 669         }
 670         return 0;
 671 }
 672
 673 static void eeepc_wmi_rfkill_exit(struct eeepc_wmi *eeepc)
 674 {
 675         eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P5");
 676         eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P6");
 677         eeepc_unregister_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P7");
 678         if (eeepc->wlan_rfkill) {
 679                 rfkill_unregister(eeepc->wlan_rfkill);
 680                 rfkill_destroy(eeepc->wlan_rfkill);
 681                 eeepc->wlan_rfkill = NULL;
 682         }
 683         /*
 684          * Refresh pci hotplug in case the rfkill state was changed after
 685          * eeepc_unregister_rfkill_notifier()
 686          */
 687         eeepc_rfkill_hotplug(eeepc);
 688         if (eeepc->hotplug_slot)
 689                 pci_hp_deregister(eeepc->hotplug_slot);
 690         if (eeepc->hotplug_workqueue)
 691                 destroy_workqueue(eeepc->hotplug_workqueue);
 692
 693         if (eeepc->bluetooth_rfkill) {
 694                 rfkill_unregister(eeepc->bluetooth_rfkill);
 695                 rfkill_destroy(eeepc->bluetooth_rfkill);
 696                 eeepc->bluetooth_rfkill = NULL;
 697         }
 698         if (eeepc->wwan3g_rfkill) {
 699                 rfkill_unregister(eeepc->wwan3g_rfkill);
 700                 rfkill_destroy(eeepc->wwan3g_rfkill);
 701                 eeepc->wwan3g_rfkill = NULL;
 702         }
 703 }
 704
 705 static int eeepc_wmi_rfkill_init(struct eeepc_wmi *eeepc)
 706 {
 707         int result = 0;
 708
 709         mutex_init(&eeepc->hotplug_lock);
 710         mutex_init(&eeepc->wmi_lock);
 711
 712         result = eeepc_new_rfkill(eeepc, &eeepc->wlan_rfkill,
 713                                   "eeepc-wlan", RFKILL_TYPE_WLAN,
 714                                   EEEPC_WMI_DEVID_WLAN);
 715
 716         if (result && result != -ENODEV)
 717                 goto exit;
 718
 719         result = eeepc_new_rfkill(eeepc, &eeepc->bluetooth_rfkill,
 720                                   "eeepc-bluetooth", RFKILL_TYPE_BLUETOOTH,
 721                                   EEEPC_WMI_DEVID_BLUETOOTH);
 722
 723         if (result && result != -ENODEV)
 724                 goto exit;
 725
 726         result = eeepc_new_rfkill(eeepc, &eeepc->wwan3g_rfkill,
 727                                   "eeepc-wwan3g", RFKILL_TYPE_WWAN,
 728                                   EEEPC_WMI_DEVID_WWAN3G);
 729
 730         if (result && result != -ENODEV)
 731                 goto exit;
 732
 733         result = eeepc_setup_pci_hotplug(eeepc);
 734         /*
 735          * If we get -EBUSY then something else is handling the PCI hotplug -
 736          * don't fail in this case
 737          */
 738         if (result == -EBUSY)
 739                 result = 0;
 740
 741         eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P5");
 742         eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P6");
 743         eeepc_register_rfkill_notifier(eeepc, "\\_SB.PCI0.P0P7");
 744         /*
 745          * Refresh pci hotplug in case the rfkill state was changed during
 746          * setup.
 747          */
 748         eeepc_rfkill_hotplug(eeepc);
 749
 750 exit:
 751         if (result && result != -ENODEV)
 752                 eeepc_wmi_rfkill_exit(eeepc);
 753
 754         if (result == -ENODEV)
 755                 result = 0;
 756
 757         return result;
 758 }
 759
 760 /*
 761  * Backlight
 762  */
 763 static int read_brightness(struct backlight_device *bd)
 764 {
 765         u32 retval;
 766         acpi_status status;
 767
 768         status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &retval);
 769
 770         if (ACPI_FAILURE(status))
 771                 return -1;
 772         else
 773                 return retval & 0xFF;
 774 }
 775
 776 static int update_bl_status(struct backlight_device *bd)
 777 {
 778
 779         u32 ctrl_param;
 780         acpi_status status;
 781
 782         ctrl_param = bd->props.brightness;
 783
 784         status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT,
 785                                         ctrl_param, NULL);
 786
 787         if (ACPI_FAILURE(status))
 788                 return -1;
 789         else
 790                 return 0;
 791 }
 792
 793 static const struct backlight_ops eeepc_wmi_bl_ops = {
 794         .get_brightness = read_brightness,
 795         .update_status = update_bl_status,
 796 };
 797
 798 static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
 799 {
 800         struct backlight_device *bd = eeepc->backlight_device;
 801         int old = bd->props.brightness;
 802         int new = old;
 803
 804         if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 805                 new = code - NOTIFY_BRNUP_MIN + 1;
 806         else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
 807                 new = code - NOTIFY_BRNDOWN_MIN;
 808
 809         bd->props.brightness = new;
 810         backlight_update_status(bd);
 811         backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
 812
 813         return old;
 814 }
 815
 816 static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
 817 {
 818         struct backlight_device *bd;
 819         struct backlight_properties props;
 820
 821         memset(&props, 0, sizeof(struct backlight_properties));
 822         props.max_brightness = 15;
 823         bd = backlight_device_register(EEEPC_WMI_FILE,
 824                                        &eeepc->platform_device->dev, eeepc,
 825                                        &eeepc_wmi_bl_ops, &props);
 826         if (IS_ERR(bd)) {
 827                 pr_err("Could not register backlight device\n");
 828                 return PTR_ERR(bd);
 829         }
 830
 831         eeepc->backlight_device = bd;
 832
 833         bd->props.brightness = read_brightness(bd);
 834         bd->props.power = FB_BLANK_UNBLANK;
 835         backlight_update_status(bd);
 836
 837         return 0;
 838 }
 839
 840 static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
 841 {
 842         if (eeepc->backlight_device)
 843                 backlight_device_unregister(eeepc->backlight_device);
 844
 845         eeepc->backlight_device = NULL;
 846 }
 847
 848 static void eeepc_wmi_notify(u32 value, void *context)
 849 {
 850         struct eeepc_wmi *eeepc = context;
 851         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 852         union acpi_object *obj;
 853         acpi_status status;
 854         int code;
 855         int orig_code;
 856
 857         status = wmi_get_event_data(value, &response);
 858         if (status != AE_OK) {
 859                 pr_err("bad event status 0x%x\n", status);
 860                 return;
 861         }
 862
 863         obj = (union acpi_object *)response.pointer;
 864
 865         if (obj && obj->type == ACPI_TYPE_INTEGER) {
 866                 code = obj->integer.value;
 867                 orig_code = code;
 868
 869                 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
 870                         code = NOTIFY_BRNUP_MIN;
 871                 else if (code >= NOTIFY_BRNDOWN_MIN &&
 872                          code <= NOTIFY_BRNDOWN_MAX)
 873                         code = NOTIFY_BRNDOWN_MIN;
 874
 875                 if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
 876                         if (!acpi_video_backlight_support())
 877                                 eeepc_wmi_backlight_notify(eeepc, orig_code);
 878                 }
 879
 880                 if (!sparse_keymap_report_event(eeepc->inputdev,
 881                                                 code, 1, true))
 882                         pr_info("Unknown key %x pressed\n", code);
 883         }
 884
 885         kfree(obj);
 886 }
 887
 888 static ssize_t store_cpufv(struct device *dev, struct device_attribute *attr,
 889                            const char *buf, size_t count)
 890 {
 891         int value;
 892         struct acpi_buffer input = { (acpi_size)sizeof(value), &value };
 893         acpi_status status;
 894
 895         if (!count || sscanf(buf, "%i", &value) != 1)
 896                 return -EINVAL;
 897         if (value < 0 || value > 2)
 898                 return -EINVAL;
 899
 900         status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
 901                                      1, EEEPC_WMI_METHODID_CFVS, &input, NULL);
 902
 903         if (ACPI_FAILURE(status))
 904                 return -EIO;
 905         else
 906                 return count;
 907 }
 908
 909 static DEVICE_ATTR(cpufv, S_IRUGO | S_IWUSR, NULL, store_cpufv);
 910
 911 static struct attribute *platform_attributes[] = {
 912         &dev_attr_cpufv.attr,
 913         NULL
 914 };
 915
 916 static struct attribute_group platform_attribute_group = {
 917         .attrs = platform_attributes
 918 };
 919
 920 static void eeepc_wmi_sysfs_exit(struct platform_device *device)
 921 {
 922         sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
 923 }
 924
 925 static int eeepc_wmi_sysfs_init(struct platform_device *device)
 926 {
 927         return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
 928 }
 929
 930 /*
 931  * Platform device
 932  */
 933 static int __init eeepc_wmi_platform_init(struct eeepc_wmi *eeepc)
 934 {
 935         int err;
 936
 937         eeepc->platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1);
 938         if (!eeepc->platform_device)
 939                 return -ENOMEM;
 940         platform_set_drvdata(eeepc->platform_device, eeepc);
 941
 942         err = platform_device_add(eeepc->platform_device);
 943         if (err)
 944                 goto fail_platform_device;
 945
 946         err = eeepc_wmi_sysfs_init(eeepc->platform_device);
 947         if (err)
 948                 goto fail_sysfs;
 949         return 0;
 950
 951 fail_sysfs:
 952         platform_device_del(eeepc->platform_device);
 953 fail_platform_device:
 954         platform_device_put(eeepc->platform_device);
 955         return err;
 956 }
 957
 958 static void eeepc_wmi_platform_exit(struct eeepc_wmi *eeepc)
 959 {
 960         eeepc_wmi_sysfs_exit(eeepc->platform_device);
 961         platform_device_unregister(eeepc->platform_device);
 962 }
 963
 964 /*
 965  * debugfs
 966  */
 967 struct eeepc_wmi_debugfs_node {
 968         struct eeepc_wmi *eeepc;
 969         char *name;
 970         int (*show)(struct seq_file *m, void *data);
 971 };
 972
 973 static int show_dsts(struct seq_file *m, void *data)
 974 {
 975         struct eeepc_wmi *eeepc = m->private;
 976         acpi_status status;
 977         u32 retval = -1;
 978
 979         status = eeepc_wmi_get_devstate(eeepc->debug.dev_id, &retval);
 980
 981         if (ACPI_FAILURE(status))
 982                 return -EIO;
 983
 984         seq_printf(m, "DSTS(%x) = %x\n", eeepc->debug.dev_id, retval);
 985
 986         return 0;
 987 }
 988
 989 static int show_devs(struct seq_file *m, void *data)
 990 {
 991         struct eeepc_wmi *eeepc = m->private;
 992         acpi_status status;
 993         u32 retval = -1;
 994
 995         status = eeepc_wmi_set_devstate(eeepc->debug.dev_id,
 996                                         eeepc->debug.ctrl_param, &retval);
 997         if (ACPI_FAILURE(status))
 998                 return -EIO;
 999
1000         seq_printf(m, "DEVS(%x, %x) = %x\n", eeepc->debug.dev_id,
1001                    eeepc->debug.ctrl_param, retval);
1002
1003         return 0;
1004 }
1005
1006 static struct eeepc_wmi_debugfs_node eeepc_wmi_debug_files[] = {
1007         { NULL, "devs", show_devs },
1008         { NULL, "dsts", show_dsts },
1009 };
1010
1011 static int eeepc_wmi_debugfs_open(struct inode *inode, struct file *file)
1012 {
1013         struct eeepc_wmi_debugfs_node *node = inode->i_private;
1014
1015         return single_open(file, node->show, node->eeepc);
1016 }
1017
1018 static const struct file_operations eeepc_wmi_debugfs_io_ops = {
1019         .owner = THIS_MODULE,
1020         .open  = eeepc_wmi_debugfs_open,
1021         .read = seq_read,
1022         .llseek = seq_lseek,
1023         .release = single_release,
1024 };
1025
1026 static void eeepc_wmi_debugfs_exit(struct eeepc_wmi *eeepc)
1027 {
1028         debugfs_remove_recursive(eeepc->debug.root);
1029 }
1030
1031 static int eeepc_wmi_debugfs_init(struct eeepc_wmi *eeepc)
1032 {
1033         struct dentry *dent;
1034         int i;
1035
1036         eeepc->debug.root = debugfs_create_dir(EEEPC_WMI_FILE, NULL);
1037         if (!eeepc->debug.root) {
1038                 pr_err("failed to create debugfs directory");
1039                 goto error_debugfs;
1040         }
1041
1042         dent = debugfs_create_x32("dev_id", S_IRUGO|S_IWUSR,
1043                                   eeepc->debug.root, &eeepc->debug.dev_id);
1044         if (!dent)
1045                 goto error_debugfs;
1046
1047         dent = debugfs_create_x32("ctrl_param", S_IRUGO|S_IWUSR,
1048                                   eeepc->debug.root, &eeepc->debug.ctrl_param);
1049         if (!dent)
1050                 goto error_debugfs;
1051
1052         for (i = 0; i < ARRAY_SIZE(eeepc_wmi_debug_files); i++) {
1053                 struct eeepc_wmi_debugfs_node *node = &eeepc_wmi_debug_files[i];
1054
1055                 node->eeepc = eeepc;
1056                 dent = debugfs_create_file(node->name, S_IFREG | S_IRUGO,
1057                                            eeepc->debug.root, node,
1058                                            &eeepc_wmi_debugfs_io_ops);
1059                 if (!dent) {
1060                         pr_err("failed to create debug file: %s\n", node->name);
1061                         goto error_debugfs;
1062                 }
1063         }
1064
1065         return 0;
1066
1067 error_debugfs:
1068         eeepc_wmi_debugfs_exit(eeepc);
1069         return -ENOMEM;
1070 }
1071
1072 /*
1073  * WMI Driver
1074  */
1075 static void eeepc_dmi_check(struct eeepc_wmi *eeepc)
1076 {
1077         const char *model;
1078
1079         model = dmi_get_system_info(DMI_PRODUCT_NAME);
1080         if (!model)
1081                 return;
1082
1083         /*
1084          * Whitelist for wlan hotplug
1085          *
1086          * Eeepc 1000H needs the current hotplug code to handle
1087          * Fn+F2 correctly. We may add other Eeepc here later, but
1088          * it seems that most of the laptops supported by eeepc-wmi
1089          * don't need to be on this list
1090          */
1091         if (strcmp(model, "1000H") == 0) {
1092                 eeepc->hotplug_wireless = true;
1093                 pr_info("wlan hotplug enabled\n");
1094         }
1095 }
1096
1097 static struct platform_device * __init eeepc_wmi_add(void)
1098 {
1099         struct eeepc_wmi *eeepc;
1100         acpi_status status;
1101         int err;
1102
1103         eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL);
1104         if (!eeepc)
1105                 return ERR_PTR(-ENOMEM);
1106
1107         eeepc->hotplug_wireless = hotplug_wireless;
1108         eeepc_dmi_check(eeepc);
1109
1110         /*
1111          * Register the platform device first.  It is used as a parent for the
1112          * sub-devices below.
1113          */
1114         err = eeepc_wmi_platform_init(eeepc);
1115         if (err)
1116                 goto fail_platform;
1117
1118         err = eeepc_wmi_input_init(eeepc);
1119         if (err)
1120                 goto fail_input;
1121
1122         err = eeepc_wmi_led_init(eeepc);
1123         if (err)
1124                 goto fail_leds;
1125
1126         err = eeepc_wmi_rfkill_init(eeepc);
1127         if (err)
1128                 goto fail_rfkill;
1129
1130         if (!acpi_video_backlight_support()) {
1131                 err = eeepc_wmi_backlight_init(eeepc);
1132                 if (err)
1133                         goto fail_backlight;
1134         } else
1135                 pr_info("Backlight controlled by ACPI video driver\n");
1136
1137         status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
1138                                             eeepc_wmi_notify, eeepc);
1139         if (ACPI_FAILURE(status)) {
1140                 pr_err("Unable to register notify handler - %d\n",
1141                         status);
1142                 err = -ENODEV;
1143                 goto fail_wmi_handler;
1144         }
1145
1146         err = eeepc_wmi_debugfs_init(eeepc);
1147         if (err)
1148                 goto fail_debugfs;
1149
1150         return eeepc->platform_device;
1151
1152 fail_debugfs:
1153         wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
1154 fail_wmi_handler:
1155         eeepc_wmi_backlight_exit(eeepc);
1156 fail_backlight:
1157         eeepc_wmi_rfkill_exit(eeepc);
1158 fail_rfkill:
1159         eeepc_wmi_led_exit(eeepc);
1160 fail_leds:
1161         eeepc_wmi_input_exit(eeepc);
1162 fail_input:
1163         eeepc_wmi_platform_exit(eeepc);
1164 fail_platform:
1165         kfree(eeepc);
1166         return ERR_PTR(err);
1167 }
1168
1169 static int eeepc_wmi_remove(struct platform_device *device)
1170 {
1171         struct eeepc_wmi *eeepc;
1172
1173         eeepc = platform_get_drvdata(device);
1174         wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
1175         eeepc_wmi_backlight_exit(eeepc);
1176         eeepc_wmi_input_exit(eeepc);
1177         eeepc_wmi_led_exit(eeepc);
1178         eeepc_wmi_rfkill_exit(eeepc);
1179         eeepc_wmi_debugfs_exit(eeepc);
1180         eeepc_wmi_platform_exit(eeepc);
1181
1182         kfree(eeepc);
1183         return 0;
1184 }
1185
1186 /*
1187  * Platform driver - hibernate/resume callbacks
1188  */
1189 static int eeepc_hotk_thaw(struct device *device)
1190 {
1191         struct eeepc_wmi *eeepc = dev_get_drvdata(device);
1192
1193         if (eeepc->wlan_rfkill) {
1194                 bool wlan;
1195
1196                 /*
1197                  * Work around bios bug - acpi _PTS turns off the wireless led
1198                  * during suspend.  Normally it restores it on resume, but
1199                  * we should kick it ourselves in case hibernation is aborted.
1200                  */
1201                 wlan = eeepc_wmi_get_devstate_simple(EEEPC_WMI_DEVID_WLAN);
1202                 eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_WLAN, wlan, NULL);
1203         }
1204
1205         return 0;
1206 }
1207
1208 static int eeepc_hotk_restore(struct device *device)
1209 {
1210         struct eeepc_wmi *eeepc = dev_get_drvdata(device);
1211         int bl;
1212
1213         /* Refresh both wlan rfkill state and pci hotplug */
1214         if (eeepc->wlan_rfkill)
1215                 eeepc_rfkill_hotplug(eeepc);
1216
1217         if (eeepc->bluetooth_rfkill) {
1218                 bl = !eeepc_wmi_get_devstate_simple(EEEPC_WMI_DEVID_BLUETOOTH);
1219                 rfkill_set_sw_state(eeepc->bluetooth_rfkill, bl);
1220 }
1221         if (eeepc->wwan3g_rfkill) {
1222                 bl = !eeepc_wmi_get_devstate_simple(EEEPC_WMI_DEVID_WWAN3G);
1223                 rfkill_set_sw_state(eeepc->wwan3g_rfkill, bl);
1224         }
1225
1226         return 0;
1227 }
1228
1229 static const struct dev_pm_ops eeepc_pm_ops = {
1230         .thaw = eeepc_hotk_thaw,
1231         .restore = eeepc_hotk_restore,
1232 };
1233
1234 static struct platform_driver platform_driver = {
1235         .driver = {
1236                 .name = EEEPC_WMI_FILE,
1237                 .owner = THIS_MODULE,
1238                 .pm = &eeepc_pm_ops,
1239         },
1240 };
1241
1242 static acpi_status __init eeepc_wmi_parse_device(acpi_handle handle, u32 level,
1243                                                  void *context, void **retval)
1244 {
1245         pr_warning("Found legacy ATKD device (%s)", EEEPC_ACPI_HID);
1246         *(bool *)context = true;
1247         return AE_CTRL_TERMINATE;
1248 }
1249
1250 static int __init eeepc_wmi_check_atkd(void)
1251 {
1252         acpi_status status;
1253         bool found = false;
1254
1255         status = acpi_get_devices(EEEPC_ACPI_HID, eeepc_wmi_parse_device,
1256                                   &found, NULL);
1257
1258         if (ACPI_FAILURE(status) || !found)
1259                 return 0;
1260         return -1;
1261 }
1262
1263 static int __init eeepc_wmi_init(void)
1264 {
1265         int err;
1266
1267         if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) ||
1268             !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
1269                 pr_warning("No known WMI GUID found\n");
1270                 return -ENODEV;
1271         }
1272
1273         if (eeepc_wmi_check_atkd()) {
1274                 pr_warning("WMI device present, but legacy ATKD device is also "
1275                            "present and enabled.");
1276                 pr_warning("You probably booted with acpi_osi=\"Linux\" or "
1277                            "acpi_osi=\"!Windows 2009\"");
1278                 pr_warning("Can't load eeepc-wmi, use default acpi_osi "
1279                            "(preferred) or eeepc-laptop");
1280                 return -ENODEV;
1281         }
1282
1283         platform_device = eeepc_wmi_add();
1284         if (IS_ERR(platform_device)) {
1285                 err = PTR_ERR(platform_device);
1286                 goto fail_eeepc_wmi;
1287         }
1288
1289         err = platform_driver_register(&platform_driver);
1290         if (err) {
1291                 pr_warning("Unable to register platform driver\n");
1292                 goto fail_platform_driver;
1293         }
1294
1295         return 0;
1296
1297 fail_platform_driver:
1298         eeepc_wmi_remove(platform_device);
1299 fail_eeepc_wmi:
1300         return err;
1301 }
1302
1303 static void __exit eeepc_wmi_exit(void)
1304 {
1305         eeepc_wmi_remove(platform_device);
1306         platform_driver_unregister(&platform_driver);
1307 }
1308
1309 module_init(eeepc_wmi_init);
1310 module_exit(eeepc_wmi_exit);