drivers/platform/x86/acer-wmi.c

   1 /*
   2  *  Acer WMI Laptop Extras
   3  *
   4  *  Copyright (C) 2007-2009     Carlos Corbacho <carlos@strangeworlds.co.uk>
   5  *
   6  *  Based on acer_acpi:
   7  *    Copyright (C) 2005-2007   E.M. Smith
   8  *    Copyright (C) 2007-2008   Carlos Corbacho <cathectic@gmail.com>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <linux/dmi.h>
  30 #include <linux/fb.h>
  31 #include <linux/backlight.h>
  32 #include <linux/leds.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/acpi.h>
  35 #include <linux/i8042.h>
  36 #include <linux/rfkill.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/debugfs.h>
  39 #include <linux/slab.h>
  40 #include <linux/input.h>
  41 #include <linux/input/sparse-keymap.h>
  42
  43 #include <acpi/acpi_drivers.h>
  44
  45 MODULE_AUTHOR("Carlos Corbacho");
  46 MODULE_DESCRIPTION("Acer Laptop WMI Extras Driver");
  47 MODULE_LICENSE("GPL");
  48
  49 #define ACER_LOGPREFIX "acer-wmi: "
  50 #define ACER_ERR KERN_ERR ACER_LOGPREFIX
  51 #define ACER_NOTICE KERN_NOTICE ACER_LOGPREFIX
  52 #define ACER_INFO KERN_INFO ACER_LOGPREFIX
  53 #define ACER_WARNING KERN_WARNING ACER_LOGPREFIX
  54
  55 /*
  56  * Magic Number
  57  * Meaning is unknown - this number is required for writing to ACPI for AMW0
  58  * (it's also used in acerhk when directly accessing the BIOS)
  59  */
  60 #define ACER_AMW0_WRITE 0x9610
  61
  62 /*
  63  * Bit masks for the AMW0 interface
  64  */
  65 #define ACER_AMW0_WIRELESS_MASK  0x35
  66 #define ACER_AMW0_BLUETOOTH_MASK 0x34
  67 #define ACER_AMW0_MAILLED_MASK   0x31
  68
  69 /*
  70  * Method IDs for WMID interface
  71  */
  72 #define ACER_WMID_GET_WIRELESS_METHODID         1
  73 #define ACER_WMID_GET_BLUETOOTH_METHODID        2
  74 #define ACER_WMID_GET_BRIGHTNESS_METHODID       3
  75 #define ACER_WMID_SET_WIRELESS_METHODID         4
  76 #define ACER_WMID_SET_BLUETOOTH_METHODID        5
  77 #define ACER_WMID_SET_BRIGHTNESS_METHODID       6
  78 #define ACER_WMID_GET_THREEG_METHODID           10
  79 #define ACER_WMID_SET_THREEG_METHODID           11
  80
  81 /*
  82  * Acer ACPI method GUIDs
  83  */
  84 #define AMW0_GUID1              "67C3371D-95A3-4C37-BB61-DD47B491DAAB"
  85 #define AMW0_GUID2              "431F16ED-0C2B-444C-B267-27DEB140CF9C"
  86 #define WMID_GUID1              "6AF4F258-B401-42fd-BE91-3D4AC2D7C0D3"
  87 #define WMID_GUID2              "95764E09-FB56-4e83-B31A-37761F60994A"
  88
  89 /*
  90  * Acer ACPI event GUIDs
  91  */
  92 #define ACERWMID_EVENT_GUID "676AA15E-6A47-4D9F-A2CC-1E6D18D14026"
  93
  94 MODULE_ALIAS("wmi:67C3371D-95A3-4C37-BB61-DD47B491DAAB");
  95 MODULE_ALIAS("wmi:6AF4F258-B401-42fd-BE91-3D4AC2D7C0D3");
  96 MODULE_ALIAS("wmi:676AA15E-6A47-4D9F-A2CC-1E6D18D14026");
  97
  98 enum acer_wmi_event_ids {
  99         WMID_HOTKEY_EVENT = 0x1,
 100 };
 101
 102 static const struct key_entry acer_wmi_keymap[] = {
 103         {KE_KEY, 0x01, {KEY_WLAN} },     /* WiFi */
 104         {KE_KEY, 0x12, {KEY_BLUETOOTH} },       /* BT */
 105         {KE_KEY, 0x21, {KEY_PROG1} },    /* Backup */
 106         {KE_KEY, 0x22, {KEY_PROG2} },    /* Arcade */
 107         {KE_KEY, 0x23, {KEY_PROG3} },    /* P_Key */
 108         {KE_KEY, 0x24, {KEY_PROG4} },    /* Social networking_Key */
 109         {KE_KEY, 0x64, {KEY_SWITCHVIDEOMODE} }, /* Display Switch */
 110         {KE_KEY, 0x82, {KEY_F22} },      /* Touch Pad On/Off */
 111         {KE_END, 0}
 112 };
 113
 114 static struct input_dev *acer_wmi_input_dev;
 115
 116 struct event_return_value {
 117         u8 function;
 118         u8 key_num;
 119         u16 device_state;
 120         u32 reserved;
 121 } __attribute__((packed));
 122
 123 /*
 124  * Interface capability flags
 125  */
 126 #define ACER_CAP_MAILLED                (1<<0)
 127 #define ACER_CAP_WIRELESS               (1<<1)
 128 #define ACER_CAP_BLUETOOTH              (1<<2)
 129 #define ACER_CAP_BRIGHTNESS             (1<<3)
 130 #define ACER_CAP_THREEG                 (1<<4)
 131 #define ACER_CAP_ANY                    (0xFFFFFFFF)
 132
 133 /*
 134  * Interface type flags
 135  */
 136 enum interface_flags {
 137         ACER_AMW0,
 138         ACER_AMW0_V2,
 139         ACER_WMID,
 140 };
 141
 142 #define ACER_DEFAULT_WIRELESS  0
 143 #define ACER_DEFAULT_BLUETOOTH 0
 144 #define ACER_DEFAULT_MAILLED   0
 145 #define ACER_DEFAULT_THREEG    0
 146
 147 static int max_brightness = 0xF;
 148
 149 static int mailled = -1;
 150 static int brightness = -1;
 151 static int threeg = -1;
 152 static int force_series;
 153
 154 module_param(mailled, int, 0444);
 155 module_param(brightness, int, 0444);
 156 module_param(threeg, int, 0444);
 157 module_param(force_series, int, 0444);
 158 MODULE_PARM_DESC(mailled, "Set initial state of Mail LED");
 159 MODULE_PARM_DESC(brightness, "Set initial LCD backlight brightness");
 160 MODULE_PARM_DESC(threeg, "Set initial state of 3G hardware");
 161 MODULE_PARM_DESC(force_series, "Force a different laptop series");
 162
 163 struct acer_data {
 164         int mailled;
 165         int threeg;
 166         int brightness;
 167 };
 168
 169 struct acer_debug {
 170         struct dentry *root;
 171         struct dentry *devices;
 172         u32 wmid_devices;
 173 };
 174
 175 static struct rfkill *wireless_rfkill;
 176 static struct rfkill *bluetooth_rfkill;
 177
 178 /* Each low-level interface must define at least some of the following */
 179 struct wmi_interface {
 180         /* The WMI device type */
 181         u32 type;
 182
 183         /* The capabilities this interface provides */
 184         u32 capability;
 185
 186         /* Private data for the current interface */
 187         struct acer_data data;
 188
 189         /* debugfs entries associated with this interface */
 190         struct acer_debug debug;
 191 };
 192
 193 /* The static interface pointer, points to the currently detected interface */
 194 static struct wmi_interface *interface;
 195
 196 /*
 197  * Embedded Controller quirks
 198  * Some laptops require us to directly access the EC to either enable or query
 199  * features that are not available through WMI.
 200  */
 201
 202 struct quirk_entry {
 203         u8 wireless;
 204         u8 mailled;
 205         s8 brightness;
 206         u8 bluetooth;
 207 };
 208
 209 static struct quirk_entry *quirks;
 210
 211 static void set_quirks(void)
 212 {
 213         if (!interface)
 214                 return;
 215
 216         if (quirks->mailled)
 217                 interface->capability |= ACER_CAP_MAILLED;
 218
 219         if (quirks->brightness)
 220                 interface->capability |= ACER_CAP_BRIGHTNESS;
 221 }
 222
 223 static int dmi_matched(const struct dmi_system_id *dmi)
 224 {
 225         quirks = dmi->driver_data;
 226         return 1;
 227 }
 228
 229 static struct quirk_entry quirk_unknown = {
 230 };
 231
 232 static struct quirk_entry quirk_acer_aspire_1520 = {
 233         .brightness = -1,
 234 };
 235
 236 static struct quirk_entry quirk_acer_travelmate_2490 = {
 237         .mailled = 1,
 238 };
 239
 240 /* This AMW0 laptop has no bluetooth */
 241 static struct quirk_entry quirk_medion_md_98300 = {
 242         .wireless = 1,
 243 };
 244
 245 static struct quirk_entry quirk_fujitsu_amilo_li_1718 = {
 246         .wireless = 2,
 247 };
 248
 249 /* The Aspire One has a dummy ACPI-WMI interface - disable it */
 250 static struct dmi_system_id __devinitdata acer_blacklist[] = {
 251         {
 252                 .ident = "Acer Aspire One (SSD)",
 253                 .matches = {
 254                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 255                         DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
 256                 },
 257         },
 258         {
 259                 .ident = "Acer Aspire One (HDD)",
 260                 .matches = {
 261                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 262                         DMI_MATCH(DMI_PRODUCT_NAME, "AOA150"),
 263                 },
 264         },
 265         {}
 266 };
 267
 268 static struct dmi_system_id acer_quirks[] = {
 269         {
 270                 .callback = dmi_matched,
 271                 .ident = "Acer Aspire 1360",
 272                 .matches = {
 273                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 274                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1360"),
 275                 },
 276                 .driver_data = &quirk_acer_aspire_1520,
 277         },
 278         {
 279                 .callback = dmi_matched,
 280                 .ident = "Acer Aspire 1520",
 281                 .matches = {
 282                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 283                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 1520"),
 284                 },
 285                 .driver_data = &quirk_acer_aspire_1520,
 286         },
 287         {
 288                 .callback = dmi_matched,
 289                 .ident = "Acer Aspire 3100",
 290                 .matches = {
 291                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 292                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3100"),
 293                 },
 294                 .driver_data = &quirk_acer_travelmate_2490,
 295         },
 296         {
 297                 .callback = dmi_matched,
 298                 .ident = "Acer Aspire 3610",
 299                 .matches = {
 300                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 301                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3610"),
 302                 },
 303                 .driver_data = &quirk_acer_travelmate_2490,
 304         },
 305         {
 306                 .callback = dmi_matched,
 307                 .ident = "Acer Aspire 5100",
 308                 .matches = {
 309                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 310                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5100"),
 311                 },
 312                 .driver_data = &quirk_acer_travelmate_2490,
 313         },
 314         {
 315                 .callback = dmi_matched,
 316                 .ident = "Acer Aspire 5610",
 317                 .matches = {
 318                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 319                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5610"),
 320                 },
 321                 .driver_data = &quirk_acer_travelmate_2490,
 322         },
 323         {
 324                 .callback = dmi_matched,
 325                 .ident = "Acer Aspire 5630",
 326                 .matches = {
 327                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 328                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5630"),
 329                 },
 330                 .driver_data = &quirk_acer_travelmate_2490,
 331         },
 332         {
 333                 .callback = dmi_matched,
 334                 .ident = "Acer Aspire 5650",
 335                 .matches = {
 336                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 337                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5650"),
 338                 },
 339                 .driver_data = &quirk_acer_travelmate_2490,
 340         },
 341         {
 342                 .callback = dmi_matched,
 343                 .ident = "Acer Aspire 5680",
 344                 .matches = {
 345                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 346                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5680"),
 347                 },
 348                 .driver_data = &quirk_acer_travelmate_2490,
 349         },
 350         {
 351                 .callback = dmi_matched,
 352                 .ident = "Acer Aspire 9110",
 353                 .matches = {
 354                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 355                         DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 9110"),
 356                 },
 357                 .driver_data = &quirk_acer_travelmate_2490,
 358         },
 359         {
 360                 .callback = dmi_matched,
 361                 .ident = "Acer TravelMate 2490",
 362                 .matches = {
 363                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 364                         DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 2490"),
 365                 },
 366                 .driver_data = &quirk_acer_travelmate_2490,
 367         },
 368         {
 369                 .callback = dmi_matched,
 370                 .ident = "Acer TravelMate 4200",
 371                 .matches = {
 372                         DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 373                         DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4200"),
 374                 },
 375                 .driver_data = &quirk_acer_travelmate_2490,
 376         },
 377         {
 378                 .callback = dmi_matched,
 379                 .ident = "Fujitsu Siemens Amilo Li 1718",
 380                 .matches = {
 381                         DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 382                         DMI_MATCH(DMI_PRODUCT_NAME, "AMILO Li 1718"),
 383                 },
 384                 .driver_data = &quirk_fujitsu_amilo_li_1718,
 385         },
 386         {
 387                 .callback = dmi_matched,
 388                 .ident = "Medion MD 98300",
 389                 .matches = {
 390                         DMI_MATCH(DMI_SYS_VENDOR, "MEDION"),
 391                         DMI_MATCH(DMI_PRODUCT_NAME, "WAM2030"),
 392                 },
 393                 .driver_data = &quirk_medion_md_98300,
 394         },
 395         {}
 396 };
 397
 398 /* Find which quirks are needed for a particular vendor/ model pair */
 399 static void find_quirks(void)
 400 {
 401         if (!force_series) {
 402                 dmi_check_system(acer_quirks);
 403         } else if (force_series == 2490) {
 404                 quirks = &quirk_acer_travelmate_2490;
 405         }
 406
 407         if (quirks == NULL)
 408                 quirks = &quirk_unknown;
 409
 410         set_quirks();
 411 }
 412
 413 /*
 414  * General interface convenience methods
 415  */
 416
 417 static bool has_cap(u32 cap)
 418 {
 419         if ((interface->capability & cap) != 0)
 420                 return 1;
 421
 422         return 0;
 423 }
 424
 425 /*
 426  * AMW0 (V1) interface
 427  */
 428 struct wmab_args {
 429         u32 eax;
 430         u32 ebx;
 431         u32 ecx;
 432         u32 edx;
 433 };
 434
 435 struct wmab_ret {
 436         u32 eax;
 437         u32 ebx;
 438         u32 ecx;
 439         u32 edx;
 440         u32 eex;
 441 };
 442
 443 static acpi_status wmab_execute(struct wmab_args *regbuf,
 444 struct acpi_buffer *result)
 445 {
 446         struct acpi_buffer input;
 447         acpi_status status;
 448         input.length = sizeof(struct wmab_args);
 449         input.pointer = (u8 *)regbuf;
 450
 451         status = wmi_evaluate_method(AMW0_GUID1, 1, 1, &input, result);
 452
 453         return status;
 454 }
 455
 456 static acpi_status AMW0_get_u32(u32 *value, u32 cap,
 457 struct wmi_interface *iface)
 458 {
 459         int err;
 460         u8 result;
 461
 462         switch (cap) {
 463         case ACER_CAP_MAILLED:
 464                 switch (quirks->mailled) {
 465                 default:
 466                         err = ec_read(0xA, &result);
 467                         if (err)
 468                                 return AE_ERROR;
 469                         *value = (result >> 7) & 0x1;
 470                         return AE_OK;
 471                 }
 472                 break;
 473         case ACER_CAP_WIRELESS:
 474                 switch (quirks->wireless) {
 475                 case 1:
 476                         err = ec_read(0x7B, &result);
 477                         if (err)
 478                                 return AE_ERROR;
 479                         *value = result & 0x1;
 480                         return AE_OK;
 481                 case 2:
 482                         err = ec_read(0x71, &result);
 483                         if (err)
 484                                 return AE_ERROR;
 485                         *value = result & 0x1;
 486                         return AE_OK;
 487                 default:
 488                         err = ec_read(0xA, &result);
 489                         if (err)
 490                                 return AE_ERROR;
 491                         *value = (result >> 2) & 0x1;
 492                         return AE_OK;
 493                 }
 494                 break;
 495         case ACER_CAP_BLUETOOTH:
 496                 switch (quirks->bluetooth) {
 497                 default:
 498                         err = ec_read(0xA, &result);
 499                         if (err)
 500                                 return AE_ERROR;
 501                         *value = (result >> 4) & 0x1;
 502                         return AE_OK;
 503                 }
 504                 break;
 505         case ACER_CAP_BRIGHTNESS:
 506                 switch (quirks->brightness) {
 507                 default:
 508                         err = ec_read(0x83, &result);
 509                         if (err)
 510                                 return AE_ERROR;
 511                         *value = result;
 512                         return AE_OK;
 513                 }
 514                 break;
 515         default:
 516                 return AE_ERROR;
 517         }
 518         return AE_OK;
 519 }
 520
 521 static acpi_status AMW0_set_u32(u32 value, u32 cap, struct wmi_interface *iface)
 522 {
 523         struct wmab_args args;
 524
 525         args.eax = ACER_AMW0_WRITE;
 526         args.ebx = value ? (1<<8) : 0;
 527         args.ecx = args.edx = 0;
 528
 529         switch (cap) {
 530         case ACER_CAP_MAILLED:
 531                 if (value > 1)
 532                         return AE_BAD_PARAMETER;
 533                 args.ebx |= ACER_AMW0_MAILLED_MASK;
 534                 break;
 535         case ACER_CAP_WIRELESS:
 536                 if (value > 1)
 537                         return AE_BAD_PARAMETER;
 538                 args.ebx |= ACER_AMW0_WIRELESS_MASK;
 539                 break;
 540         case ACER_CAP_BLUETOOTH:
 541                 if (value > 1)
 542                         return AE_BAD_PARAMETER;
 543                 args.ebx |= ACER_AMW0_BLUETOOTH_MASK;
 544                 break;
 545         case ACER_CAP_BRIGHTNESS:
 546                 if (value > max_brightness)
 547                         return AE_BAD_PARAMETER;
 548                 switch (quirks->brightness) {
 549                 default:
 550                         return ec_write(0x83, value);
 551                         break;
 552                 }
 553         default:
 554                 return AE_ERROR;
 555         }
 556
 557         /* Actually do the set */
 558         return wmab_execute(&args, NULL);
 559 }
 560
 561 static acpi_status AMW0_find_mailled(void)
 562 {
 563         struct wmab_args args;
 564         struct wmab_ret ret;
 565         acpi_status status = AE_OK;
 566         struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
 567         union acpi_object *obj;
 568
 569         args.eax = 0x86;
 570         args.ebx = args.ecx = args.edx = 0;
 571
 572         status = wmab_execute(&args, &out);
 573         if (ACPI_FAILURE(status))
 574                 return status;
 575
 576         obj = (union acpi_object *) out.pointer;
 577         if (obj && obj->type == ACPI_TYPE_BUFFER &&
 578         obj->buffer.length == sizeof(struct wmab_ret)) {
 579                 ret = *((struct wmab_ret *) obj->buffer.pointer);
 580         } else {
 581                 kfree(out.pointer);
 582                 return AE_ERROR;
 583         }
 584
 585         if (ret.eex & 0x1)
 586                 interface->capability |= ACER_CAP_MAILLED;
 587
 588         kfree(out.pointer);
 589
 590         return AE_OK;
 591 }
 592
 593 static acpi_status AMW0_set_capabilities(void)
 594 {
 595         struct wmab_args args;
 596         struct wmab_ret ret;
 597         acpi_status status;
 598         struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
 599         union acpi_object *obj;
 600
 601         /*
 602          * On laptops with this strange GUID (non Acer), normal probing doesn't
 603          * work.
 604          */
 605         if (wmi_has_guid(AMW0_GUID2)) {
 606                 interface->capability |= ACER_CAP_WIRELESS;
 607                 return AE_OK;
 608         }
 609
 610         args.eax = ACER_AMW0_WRITE;
 611         args.ecx = args.edx = 0;
 612
 613         args.ebx = 0xa2 << 8;
 614         args.ebx |= ACER_AMW0_WIRELESS_MASK;
 615
 616         status = wmab_execute(&args, &out);
 617         if (ACPI_FAILURE(status))
 618                 return status;
 619
 620         obj = out.pointer;
 621         if (obj && obj->type == ACPI_TYPE_BUFFER &&
 622         obj->buffer.length == sizeof(struct wmab_ret)) {
 623                 ret = *((struct wmab_ret *) obj->buffer.pointer);
 624         } else {
 625                 status = AE_ERROR;
 626                 goto out;
 627         }
 628
 629         if (ret.eax & 0x1)
 630                 interface->capability |= ACER_CAP_WIRELESS;
 631
 632         args.ebx = 2 << 8;
 633         args.ebx |= ACER_AMW0_BLUETOOTH_MASK;
 634
 635         /*
 636          * It's ok to use existing buffer for next wmab_execute call.
 637          * But we need to kfree(out.pointer) if next wmab_execute fail.
 638          */
 639         status = wmab_execute(&args, &out);
 640         if (ACPI_FAILURE(status))
 641                 goto out;
 642
 643         obj = (union acpi_object *) out.pointer;
 644         if (obj && obj->type == ACPI_TYPE_BUFFER
 645         && obj->buffer.length == sizeof(struct wmab_ret)) {
 646                 ret = *((struct wmab_ret *) obj->buffer.pointer);
 647         } else {
 648                 status = AE_ERROR;
 649                 goto out;
 650         }
 651
 652         if (ret.eax & 0x1)
 653                 interface->capability |= ACER_CAP_BLUETOOTH;
 654
 655         /*
 656          * This appears to be safe to enable, since all Wistron based laptops
 657          * appear to use the same EC register for brightness, even if they
 658          * differ for wireless, etc
 659          */
 660         if (quirks->brightness >= 0)
 661                 interface->capability |= ACER_CAP_BRIGHTNESS;
 662
 663         status = AE_OK;
 664 out:
 665         kfree(out.pointer);
 666         return status;
 667 }
 668
 669 static struct wmi_interface AMW0_interface = {
 670         .type = ACER_AMW0,
 671 };
 672
 673 static struct wmi_interface AMW0_V2_interface = {
 674         .type = ACER_AMW0_V2,
 675 };
 676
 677 /*
 678  * New interface (The WMID interface)
 679  */
 680 static acpi_status
 681 WMI_execute_u32(u32 method_id, u32 in, u32 *out)
 682 {
 683         struct acpi_buffer input = { (acpi_size) sizeof(u32), (void *)(&in) };
 684         struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
 685         union acpi_object *obj;
 686         u32 tmp;
 687         acpi_status status;
 688
 689         status = wmi_evaluate_method(WMID_GUID1, 1, method_id, &input, &result);
 690
 691         if (ACPI_FAILURE(status))
 692                 return status;
 693
 694         obj = (union acpi_object *) result.pointer;
 695         if (obj && obj->type == ACPI_TYPE_BUFFER &&
 696                 obj->buffer.length == sizeof(u32)) {
 697                 tmp = *((u32 *) obj->buffer.pointer);
 698         } else {
 699                 tmp = 0;
 700         }
 701
 702         if (out)
 703                 *out = tmp;
 704
 705         kfree(result.pointer);
 706
 707         return status;
 708 }
 709
 710 static acpi_status WMID_get_u32(u32 *value, u32 cap,
 711 struct wmi_interface *iface)
 712 {
 713         acpi_status status;
 714         u8 tmp;
 715         u32 result, method_id = 0;
 716
 717         switch (cap) {
 718         case ACER_CAP_WIRELESS:
 719                 method_id = ACER_WMID_GET_WIRELESS_METHODID;
 720                 break;
 721         case ACER_CAP_BLUETOOTH:
 722                 method_id = ACER_WMID_GET_BLUETOOTH_METHODID;
 723                 break;
 724         case ACER_CAP_BRIGHTNESS:
 725                 method_id = ACER_WMID_GET_BRIGHTNESS_METHODID;
 726                 break;
 727         case ACER_CAP_THREEG:
 728                 method_id = ACER_WMID_GET_THREEG_METHODID;
 729                 break;
 730         case ACER_CAP_MAILLED:
 731                 if (quirks->mailled == 1) {
 732                         ec_read(0x9f, &tmp);
 733                         *value = tmp & 0x1;
 734                         return 0;
 735                 }
 736         default:
 737                 return AE_ERROR;
 738         }
 739         status = WMI_execute_u32(method_id, 0, &result);
 740
 741         if (ACPI_SUCCESS(status))
 742                 *value = (u8)result;
 743
 744         return status;
 745 }
 746
 747 static acpi_status WMID_set_u32(u32 value, u32 cap, struct wmi_interface *iface)
 748 {
 749         u32 method_id = 0;
 750         char param;
 751
 752         switch (cap) {
 753         case ACER_CAP_BRIGHTNESS:
 754                 if (value > max_brightness)
 755                         return AE_BAD_PARAMETER;
 756                 method_id = ACER_WMID_SET_BRIGHTNESS_METHODID;
 757                 break;
 758         case ACER_CAP_WIRELESS:
 759                 if (value > 1)
 760                         return AE_BAD_PARAMETER;
 761                 method_id = ACER_WMID_SET_WIRELESS_METHODID;
 762                 break;
 763         case ACER_CAP_BLUETOOTH:
 764                 if (value > 1)
 765                         return AE_BAD_PARAMETER;
 766                 method_id = ACER_WMID_SET_BLUETOOTH_METHODID;
 767                 break;
 768         case ACER_CAP_THREEG:
 769                 if (value > 1)
 770                         return AE_BAD_PARAMETER;
 771                 method_id = ACER_WMID_SET_THREEG_METHODID;
 772                 break;
 773         case ACER_CAP_MAILLED:
 774                 if (value > 1)
 775                         return AE_BAD_PARAMETER;
 776                 if (quirks->mailled == 1) {
 777                         param = value ? 0x92 : 0x93;
 778                         i8042_lock_chip();
 779                         i8042_command(&param, 0x1059);
 780                         i8042_unlock_chip();
 781                         return 0;
 782                 }
 783                 break;
 784         default:
 785                 return AE_ERROR;
 786         }
 787         return WMI_execute_u32(method_id, (u32)value, NULL);
 788 }
 789
 790 static acpi_status WMID_set_capabilities(void)
 791 {
 792         struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
 793         union acpi_object *obj;
 794         acpi_status status;
 795         u32 devices;
 796
 797         status = wmi_query_block(WMID_GUID2, 1, &out);
 798         if (ACPI_FAILURE(status))
 799                 return status;
 800
 801         obj = (union acpi_object *) out.pointer;
 802         if (obj && obj->type == ACPI_TYPE_BUFFER &&
 803                 obj->buffer.length == sizeof(u32)) {
 804                 devices = *((u32 *) obj->buffer.pointer);
 805         } else {
 806                 kfree(out.pointer);
 807                 return AE_ERROR;
 808         }
 809
 810         /* Not sure on the meaning of the relevant bits yet to detect these */
 811         interface->capability |= ACER_CAP_WIRELESS;
 812         interface->capability |= ACER_CAP_THREEG;
 813
 814         /* WMID always provides brightness methods */
 815         interface->capability |= ACER_CAP_BRIGHTNESS;
 816
 817         if (devices & 0x10)
 818                 interface->capability |= ACER_CAP_BLUETOOTH;
 819
 820         if (!(devices & 0x20))
 821                 max_brightness = 0x9;
 822
 823         kfree(out.pointer);
 824         return status;
 825 }
 826
 827 static struct wmi_interface wmid_interface = {
 828         .type = ACER_WMID,
 829 };
 830
 831 /*
 832  * Generic Device (interface-independent)
 833  */
 834
 835 static acpi_status get_u32(u32 *value, u32 cap)
 836 {
 837         acpi_status status = AE_ERROR;
 838
 839         switch (interface->type) {
 840         case ACER_AMW0:
 841                 status = AMW0_get_u32(value, cap, interface);
 842                 break;
 843         case ACER_AMW0_V2:
 844                 if (cap == ACER_CAP_MAILLED) {
 845                         status = AMW0_get_u32(value, cap, interface);
 846                         break;
 847                 }
 848         case ACER_WMID:
 849                 status = WMID_get_u32(value, cap, interface);
 850                 break;
 851         }
 852
 853         return status;
 854 }
 855
 856 static acpi_status set_u32(u32 value, u32 cap)
 857 {
 858         acpi_status status;
 859
 860         if (interface->capability & cap) {
 861                 switch (interface->type) {
 862                 case ACER_AMW0:
 863                         return AMW0_set_u32(value, cap, interface);
 864                 case ACER_AMW0_V2:
 865                         if (cap == ACER_CAP_MAILLED)
 866                                 return AMW0_set_u32(value, cap, interface);
 867
 868                         /*
 869                          * On some models, some WMID methods don't toggle
 870                          * properly. For those cases, we want to run the AMW0
 871                          * method afterwards to be certain we've really toggled
 872                          * the device state.
 873                          */
 874                         if (cap == ACER_CAP_WIRELESS ||
 875                                 cap == ACER_CAP_BLUETOOTH) {
 876                                 status = WMID_set_u32(value, cap, interface);
 877                                 if (ACPI_FAILURE(status))
 878                                         return status;
 879
 880                                 return AMW0_set_u32(value, cap, interface);
 881                         }
 882                 case ACER_WMID:
 883                         return WMID_set_u32(value, cap, interface);
 884                 default:
 885                         return AE_BAD_PARAMETER;
 886                 }
 887         }
 888         return AE_BAD_PARAMETER;
 889 }
 890
 891 static void __init acer_commandline_init(void)
 892 {
 893         /*
 894          * These will all fail silently if the value given is invalid, or the
 895          * capability isn't available on the given interface
 896          */
 897         set_u32(mailled, ACER_CAP_MAILLED);
 898         set_u32(threeg, ACER_CAP_THREEG);
 899         set_u32(brightness, ACER_CAP_BRIGHTNESS);
 900 }
 901
 902 /*
 903  * LED device (Mail LED only, no other LEDs known yet)
 904  */
 905 static void mail_led_set(struct led_classdev *led_cdev,
 906 enum led_brightness value)
 907 {
 908         set_u32(value, ACER_CAP_MAILLED);
 909 }
 910
 911 static struct led_classdev mail_led = {
 912         .name = "acer-wmi::mail",
 913         .brightness_set = mail_led_set,
 914 };
 915
 916 static int __devinit acer_led_init(struct device *dev)
 917 {
 918         return led_classdev_register(dev, &mail_led);
 919 }
 920
 921 static void acer_led_exit(void)
 922 {
 923         led_classdev_unregister(&mail_led);
 924 }
 925
 926 /*
 927  * Backlight device
 928  */
 929 static struct backlight_device *acer_backlight_device;
 930
 931 static int read_brightness(struct backlight_device *bd)
 932 {
 933         u32 value;
 934         get_u32(&value, ACER_CAP_BRIGHTNESS);
 935         return value;
 936 }
 937
 938 static int update_bl_status(struct backlight_device *bd)
 939 {
 940         int intensity = bd->props.brightness;
 941
 942         if (bd->props.power != FB_BLANK_UNBLANK)
 943                 intensity = 0;
 944         if (bd->props.fb_blank != FB_BLANK_UNBLANK)
 945                 intensity = 0;
 946
 947         set_u32(intensity, ACER_CAP_BRIGHTNESS);
 948
 949         return 0;
 950 }
 951
 952 static struct backlight_ops acer_bl_ops = {
 953         .get_brightness = read_brightness,
 954         .update_status = update_bl_status,
 955 };
 956
 957 static int __devinit acer_backlight_init(struct device *dev)
 958 {
 959         struct backlight_properties props;
 960         struct backlight_device *bd;
 961
 962         memset(&props, 0, sizeof(struct backlight_properties));
 963         props.max_brightness = max_brightness;
 964         bd = backlight_device_register("acer-wmi", dev, NULL, &acer_bl_ops,
 965                                        &props);
 966         if (IS_ERR(bd)) {
 967                 printk(ACER_ERR "Could not register Acer backlight device\n");
 968                 acer_backlight_device = NULL;
 969                 return PTR_ERR(bd);
 970         }
 971
 972         acer_backlight_device = bd;
 973
 974         bd->props.power = FB_BLANK_UNBLANK;
 975         bd->props.brightness = read_brightness(bd);
 976         backlight_update_status(bd);
 977         return 0;
 978 }
 979
 980 static void acer_backlight_exit(void)
 981 {
 982         backlight_device_unregister(acer_backlight_device);
 983 }
 984
 985 /*
 986  * Rfkill devices
 987  */
 988 static void acer_rfkill_update(struct work_struct *ignored);
 989 static DECLARE_DELAYED_WORK(acer_rfkill_work, acer_rfkill_update);
 990 static void acer_rfkill_update(struct work_struct *ignored)
 991 {
 992         u32 state;
 993         acpi_status status;
 994
 995         status = get_u32(&state, ACER_CAP_WIRELESS);
 996         if (ACPI_SUCCESS(status))
 997                 rfkill_set_sw_state(wireless_rfkill, !state);
 998
 999         if (has_cap(ACER_CAP_BLUETOOTH)) {
1000                 status = get_u32(&state, ACER_CAP_BLUETOOTH);
1001                 if (ACPI_SUCCESS(status))
1002                         rfkill_set_sw_state(bluetooth_rfkill, !state);
1003         }
1004
1005         schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));
1006 }
1007
1008 static int acer_rfkill_set(void *data, bool blocked)
1009 {
1010         acpi_status status;
1011         u32 cap = (unsigned long)data;
1012         status = set_u32(!blocked, cap);
1013         if (ACPI_FAILURE(status))
1014                 return -ENODEV;
1015         return 0;
1016 }
1017
1018 static const struct rfkill_ops acer_rfkill_ops = {
1019         .set_block = acer_rfkill_set,
1020 };
1021
1022 static struct rfkill *acer_rfkill_register(struct device *dev,
1023                                            enum rfkill_type type,
1024                                            char *name, u32 cap)
1025 {
1026         int err;
1027         struct rfkill *rfkill_dev;
1028
1029         rfkill_dev = rfkill_alloc(name, dev, type,
1030                                   &acer_rfkill_ops,
1031                                   (void *)(unsigned long)cap);
1032         if (!rfkill_dev)
1033                 return ERR_PTR(-ENOMEM);
1034
1035         err = rfkill_register(rfkill_dev);
1036         if (err) {
1037                 rfkill_destroy(rfkill_dev);
1038                 return ERR_PTR(err);
1039         }
1040         return rfkill_dev;
1041 }
1042
1043 static int acer_rfkill_init(struct device *dev)
1044 {
1045         wireless_rfkill = acer_rfkill_register(dev, RFKILL_TYPE_WLAN,
1046                 "acer-wireless", ACER_CAP_WIRELESS);
1047         if (IS_ERR(wireless_rfkill))
1048                 return PTR_ERR(wireless_rfkill);
1049
1050         if (has_cap(ACER_CAP_BLUETOOTH)) {
1051                 bluetooth_rfkill = acer_rfkill_register(dev,
1052                         RFKILL_TYPE_BLUETOOTH, "acer-bluetooth",
1053                         ACER_CAP_BLUETOOTH);
1054                 if (IS_ERR(bluetooth_rfkill)) {
1055                         rfkill_unregister(wireless_rfkill);
1056                         rfkill_destroy(wireless_rfkill);
1057                         return PTR_ERR(bluetooth_rfkill);
1058                 }
1059         }
1060
1061         schedule_delayed_work(&acer_rfkill_work, round_jiffies_relative(HZ));
1062
1063         return 0;
1064 }
1065
1066 static void acer_rfkill_exit(void)
1067 {
1068         cancel_delayed_work_sync(&acer_rfkill_work);
1069
1070         rfkill_unregister(wireless_rfkill);
1071         rfkill_destroy(wireless_rfkill);
1072
1073         if (has_cap(ACER_CAP_BLUETOOTH)) {
1074                 rfkill_unregister(bluetooth_rfkill);
1075                 rfkill_destroy(bluetooth_rfkill);
1076         }
1077         return;
1078 }
1079
1080 /*
1081  * sysfs interface
1082  */
1083 static ssize_t show_bool_threeg(struct device *dev,
1084         struct device_attribute *attr, char *buf)
1085 {
1086         u32 result; \
1087         acpi_status status = get_u32(&result, ACER_CAP_THREEG);
1088         if (ACPI_SUCCESS(status))
1089                 return sprintf(buf, "%u\n", result);
1090         return sprintf(buf, "Read error\n");
1091 }
1092
1093 static ssize_t set_bool_threeg(struct device *dev,
1094         struct device_attribute *attr, const char *buf, size_t count)
1095 {
1096         u32 tmp = simple_strtoul(buf, NULL, 10);
1097         acpi_status status = set_u32(tmp, ACER_CAP_THREEG);
1098                 if (ACPI_FAILURE(status))
1099                         return -EINVAL;
1100         return count;
1101 }
1102 static DEVICE_ATTR(threeg, S_IWUGO | S_IRUGO | S_IWUSR, show_bool_threeg,
1103         set_bool_threeg);
1104
1105 static ssize_t show_interface(struct device *dev, struct device_attribute *attr,
1106         char *buf)
1107 {
1108         switch (interface->type) {
1109         case ACER_AMW0:
1110                 return sprintf(buf, "AMW0\n");
1111         case ACER_AMW0_V2:
1112                 return sprintf(buf, "AMW0 v2\n");
1113         case ACER_WMID:
1114                 return sprintf(buf, "WMID\n");
1115         default:
1116                 return sprintf(buf, "Error!\n");
1117         }
1118 }
1119
1120 static DEVICE_ATTR(interface, S_IRUGO, show_interface, NULL);
1121
1122 static void acer_wmi_notify(u32 value, void *context)
1123 {
1124         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
1125         union acpi_object *obj;
1126         struct event_return_value return_value;
1127         acpi_status status;
1128
1129         status = wmi_get_event_data(value, &response);
1130         if (status != AE_OK) {
1131                 printk(ACER_WARNING "bad event status 0x%x\n", status);
1132                 return;
1133         }
1134
1135         obj = (union acpi_object *)response.pointer;
1136
1137         if (!obj)
1138                 return;
1139         if (obj->type != ACPI_TYPE_BUFFER) {
1140                 printk(ACER_WARNING "Unknown response received %d\n",
1141                         obj->type);
1142                 kfree(obj);
1143                 return;
1144         }
1145         if (obj->buffer.length != 8) {
1146                 printk(ACER_WARNING "Unknown buffer length %d\n",
1147                         obj->buffer.length);
1148                 kfree(obj);
1149                 return;
1150         }
1151
1152         return_value = *((struct event_return_value *)obj->buffer.pointer);
1153         kfree(obj);
1154
1155         switch (return_value.function) {
1156         case WMID_HOTKEY_EVENT:
1157                 if (!sparse_keymap_report_event(acer_wmi_input_dev,
1158                                 return_value.key_num, 1, true))
1159                         printk(ACER_WARNING "Unknown key number - 0x%x\n",
1160                                 return_value.key_num);
1161                 break;
1162         default:
1163                 printk(ACER_WARNING "Unknown function number - %d - %d\n",
1164                         return_value.function, return_value.key_num);
1165                 break;
1166         }
1167 }
1168
1169 static int __init acer_wmi_input_setup(void)
1170 {
1171         acpi_status status;
1172         int err;
1173
1174         acer_wmi_input_dev = input_allocate_device();
1175         if (!acer_wmi_input_dev)
1176                 return -ENOMEM;
1177
1178         acer_wmi_input_dev->name = "Acer WMI hotkeys";
1179         acer_wmi_input_dev->phys = "wmi/input0";
1180         acer_wmi_input_dev->id.bustype = BUS_HOST;
1181
1182         err = sparse_keymap_setup(acer_wmi_input_dev, acer_wmi_keymap, NULL);
1183         if (err)
1184                 goto err_free_dev;
1185
1186         status = wmi_install_notify_handler(ACERWMID_EVENT_GUID,
1187                                                 acer_wmi_notify, NULL);
1188         if (ACPI_FAILURE(status)) {
1189                 err = -EIO;
1190                 goto err_free_keymap;
1191         }
1192
1193         err = input_register_device(acer_wmi_input_dev);
1194         if (err)
1195                 goto err_uninstall_notifier;
1196
1197         return 0;
1198
1199 err_uninstall_notifier:
1200         wmi_remove_notify_handler(ACERWMID_EVENT_GUID);
1201 err_free_keymap:
1202         sparse_keymap_free(acer_wmi_input_dev);
1203 err_free_dev:
1204         input_free_device(acer_wmi_input_dev);
1205         return err;
1206 }
1207
1208 static void acer_wmi_input_destroy(void)
1209 {
1210         wmi_remove_notify_handler(ACERWMID_EVENT_GUID);
1211         sparse_keymap_free(acer_wmi_input_dev);
1212         input_unregister_device(acer_wmi_input_dev);
1213 }
1214
1215 /*
1216  * debugfs functions
1217  */
1218 static u32 get_wmid_devices(void)
1219 {
1220         struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
1221         union acpi_object *obj;
1222         acpi_status status;
1223         u32 devices = 0;
1224
1225         status = wmi_query_block(WMID_GUID2, 1, &out);
1226         if (ACPI_FAILURE(status))
1227                 return 0;
1228
1229         obj = (union acpi_object *) out.pointer;
1230         if (obj && obj->type == ACPI_TYPE_BUFFER &&
1231                 obj->buffer.length == sizeof(u32)) {
1232                 devices = *((u32 *) obj->buffer.pointer);
1233         }
1234
1235         kfree(out.pointer);
1236         return devices;
1237 }
1238
1239 /*
1240  * Platform device
1241  */
1242 static int __devinit acer_platform_probe(struct platform_device *device)
1243 {
1244         int err;
1245
1246         if (has_cap(ACER_CAP_MAILLED)) {
1247                 err = acer_led_init(&device->dev);
1248                 if (err)
1249                         goto error_mailled;
1250         }
1251
1252         if (has_cap(ACER_CAP_BRIGHTNESS)) {
1253                 err = acer_backlight_init(&device->dev);
1254                 if (err)
1255                         goto error_brightness;
1256         }
1257
1258         err = acer_rfkill_init(&device->dev);
1259         if (err)
1260                 goto error_rfkill;
1261
1262         return err;
1263
1264 error_rfkill:
1265         if (has_cap(ACER_CAP_BRIGHTNESS))
1266                 acer_backlight_exit();
1267 error_brightness:
1268         if (has_cap(ACER_CAP_MAILLED))
1269                 acer_led_exit();
1270 error_mailled:
1271         return err;
1272 }
1273
1274 static int acer_platform_remove(struct platform_device *device)
1275 {
1276         if (has_cap(ACER_CAP_MAILLED))
1277                 acer_led_exit();
1278         if (has_cap(ACER_CAP_BRIGHTNESS))
1279                 acer_backlight_exit();
1280
1281         acer_rfkill_exit();
1282         return 0;
1283 }
1284
1285 static int acer_platform_suspend(struct platform_device *dev,
1286 pm_message_t state)
1287 {
1288         u32 value;
1289         struct acer_data *data = &interface->data;
1290
1291         if (!data)
1292                 return -ENOMEM;
1293
1294         if (has_cap(ACER_CAP_MAILLED)) {
1295                 get_u32(&value, ACER_CAP_MAILLED);
1296                 data->mailled = value;
1297         }
1298
1299         if (has_cap(ACER_CAP_BRIGHTNESS)) {
1300                 get_u32(&value, ACER_CAP_BRIGHTNESS);
1301                 data->brightness = value;
1302         }
1303
1304         return 0;
1305 }
1306
1307 static int acer_platform_resume(struct platform_device *device)
1308 {
1309         struct acer_data *data = &interface->data;
1310
1311         if (!data)
1312                 return -ENOMEM;
1313
1314         if (has_cap(ACER_CAP_MAILLED))
1315                 set_u32(data->mailled, ACER_CAP_MAILLED);
1316
1317         if (has_cap(ACER_CAP_BRIGHTNESS))
1318                 set_u32(data->brightness, ACER_CAP_BRIGHTNESS);
1319
1320         return 0;
1321 }
1322
1323 static struct platform_driver acer_platform_driver = {
1324         .driver = {
1325                 .name = "acer-wmi",
1326                 .owner = THIS_MODULE,
1327         },
1328         .probe = acer_platform_probe,
1329         .remove = acer_platform_remove,
1330         .suspend = acer_platform_suspend,
1331         .resume = acer_platform_resume,
1332 };
1333
1334 static struct platform_device *acer_platform_device;
1335
1336 static int remove_sysfs(struct platform_device *device)
1337 {
1338         if (has_cap(ACER_CAP_THREEG))
1339                 device_remove_file(&device->dev, &dev_attr_threeg);
1340
1341         device_remove_file(&device->dev, &dev_attr_interface);
1342
1343         return 0;
1344 }
1345
1346 static int create_sysfs(void)
1347 {
1348         int retval = -ENOMEM;
1349
1350         if (has_cap(ACER_CAP_THREEG)) {
1351                 retval = device_create_file(&acer_platform_device->dev,
1352                         &dev_attr_threeg);
1353                 if (retval)
1354                         goto error_sysfs;
1355         }
1356
1357         retval = device_create_file(&acer_platform_device->dev,
1358                 &dev_attr_interface);
1359         if (retval)
1360                 goto error_sysfs;
1361
1362         return 0;
1363
1364 error_sysfs:
1365                 remove_sysfs(acer_platform_device);
1366         return retval;
1367 }
1368
1369 static void remove_debugfs(void)
1370 {
1371         debugfs_remove(interface->debug.devices);
1372         debugfs_remove(interface->debug.root);
1373 }
1374
1375 static int create_debugfs(void)
1376 {
1377         interface->debug.root = debugfs_create_dir("acer-wmi", NULL);
1378         if (!interface->debug.root) {
1379                 printk(ACER_ERR "Failed to create debugfs directory");
1380                 return -ENOMEM;
1381         }
1382
1383         interface->debug.devices = debugfs_create_u32("devices", S_IRUGO,
1384                                         interface->debug.root,
1385                                         &interface->debug.wmid_devices);
1386         if (!interface->debug.devices)
1387                 goto error_debugfs;
1388
1389         return 0;
1390
1391 error_debugfs:
1392         remove_debugfs();
1393         return -ENOMEM;
1394 }
1395
1396 static int __init acer_wmi_init(void)
1397 {
1398         int err;
1399
1400         printk(ACER_INFO "Acer Laptop ACPI-WMI Extras\n");
1401
1402         if (dmi_check_system(acer_blacklist)) {
1403                 printk(ACER_INFO "Blacklisted hardware detected - "
1404                                 "not loading\n");
1405                 return -ENODEV;
1406         }
1407
1408         find_quirks();
1409
1410         /*
1411          * Detect which ACPI-WMI interface we're using.
1412          */
1413         if (wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
1414                 interface = &AMW0_V2_interface;
1415
1416         if (!wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
1417                 interface = &wmid_interface;
1418
1419         if (wmi_has_guid(WMID_GUID2) && interface) {
1420                 if (ACPI_FAILURE(WMID_set_capabilities())) {
1421                         printk(ACER_ERR "Unable to detect available WMID "
1422                                         "devices\n");
1423                         return -ENODEV;
1424                 }
1425         } else if (!wmi_has_guid(WMID_GUID2) && interface) {
1426                 printk(ACER_ERR "No WMID device detection method found\n");
1427                 return -ENODEV;
1428         }
1429
1430         if (wmi_has_guid(AMW0_GUID1) && !wmi_has_guid(WMID_GUID1)) {
1431                 interface = &AMW0_interface;
1432
1433                 if (ACPI_FAILURE(AMW0_set_capabilities())) {
1434                         printk(ACER_ERR "Unable to detect available AMW0 "
1435                                         "devices\n");
1436                         return -ENODEV;
1437                 }
1438         }
1439
1440         if (wmi_has_guid(AMW0_GUID1))
1441                 AMW0_find_mailled();
1442
1443         if (!interface) {
1444                 printk(ACER_INFO "No or unsupported WMI interface, unable to "
1445                                 "load\n");
1446                 return -ENODEV;
1447         }
1448
1449         set_quirks();
1450
1451         if (acpi_video_backlight_support() && has_cap(ACER_CAP_BRIGHTNESS)) {
1452                 interface->capability &= ~ACER_CAP_BRIGHTNESS;
1453                 printk(ACER_INFO "Brightness must be controlled by "
1454                        "generic video driver\n");
1455         }
1456
1457         if (wmi_has_guid(ACERWMID_EVENT_GUID)) {
1458                 err = acer_wmi_input_setup();
1459                 if (err)
1460                         return err;
1461         }
1462
1463         err = platform_driver_register(&acer_platform_driver);
1464         if (err) {
1465                 printk(ACER_ERR "Unable to register platform driver.\n");
1466                 goto error_platform_register;
1467         }
1468
1469         acer_platform_device = platform_device_alloc("acer-wmi", -1);
1470         if (!acer_platform_device) {
1471                 err = -ENOMEM;
1472                 goto error_device_alloc;
1473         }
1474
1475         err = platform_device_add(acer_platform_device);
1476         if (err)
1477                 goto error_device_add;
1478
1479         err = create_sysfs();
1480         if (err)
1481                 goto error_create_sys;
1482
1483         if (wmi_has_guid(WMID_GUID2)) {
1484                 interface->debug.wmid_devices = get_wmid_devices();
1485                 err = create_debugfs();
1486                 if (err)
1487                         goto error_create_debugfs;
1488         }
1489
1490         /* Override any initial settings with values from the commandline */
1491         acer_commandline_init();
1492
1493         return 0;
1494
1495 error_create_debugfs:
1496         remove_sysfs(acer_platform_device);
1497 error_create_sys:
1498         platform_device_del(acer_platform_device);
1499 error_device_add:
1500         platform_device_put(acer_platform_device);
1501 error_device_alloc:
1502         platform_driver_unregister(&acer_platform_driver);
1503 error_platform_register:
1504         if (wmi_has_guid(ACERWMID_EVENT_GUID))
1505                 acer_wmi_input_destroy();
1506
1507         return err;
1508 }
1509
1510 static void __exit acer_wmi_exit(void)
1511 {
1512         if (wmi_has_guid(ACERWMID_EVENT_GUID))
1513                 acer_wmi_input_destroy();
1514
1515         remove_sysfs(acer_platform_device);
1516         remove_debugfs();
1517         platform_device_unregister(acer_platform_device);
1518         platform_driver_unregister(&acer_platform_driver);
1519
1520         printk(ACER_INFO "Acer Laptop WMI Extras unloaded\n");
1521         return;
1522 }
1523
1524 module_init(acer_wmi_init);
1525 module_exit(acer_wmi_exit);