drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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 (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/input.h>
  34 #include <linux/backlight.h>
  35 #include <linux/thermal.h>
  36 #include <linux/sort.h>
  37 #include <linux/pci.h>
  38 #include <linux/pci_ids.h>
  39 #include <linux/slab.h>
  40 #include <asm/uaccess.h>
  41 #include <linux/dmi.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44 #include <linux/suspend.h>
  45 #include <acpi/video.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_CLASS                "video"
  50 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  51 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  52 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  53 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  54 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  57
  58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  63
  64 #define MAX_NAME_LEN    20
  65
  66 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  67 ACPI_MODULE_NAME("video");
  68
  69 MODULE_AUTHOR("Bruno Ducrot");
  70 MODULE_DESCRIPTION("ACPI Video Driver");
  71 MODULE_LICENSE("GPL");
  72
  73 static int brightness_switch_enabled = 1;
  74 module_param(brightness_switch_enabled, bool, 0644);
  75
  76 /*
  77  * By default, we don't allow duplicate ACPI video bus devices
  78  * under the same VGA controller
  79  */
  80 static int allow_duplicates;
  81 module_param(allow_duplicates, bool, 0644);
  82
  83 /*
  84  * Some BIOSes claim they use minimum backlight at boot,
  85  * and this may bring dimming screen after boot
  86  */
  87 static int use_bios_initial_backlight = 1;
  88 module_param(use_bios_initial_backlight, bool, 0644);
  89
  90 static int register_count = 0;
  91 static int acpi_video_bus_add(struct acpi_device *device);
  92 static int acpi_video_bus_remove(struct acpi_device *device, int type);
  93 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  94
  95 static const struct acpi_device_id video_device_ids[] = {
  96         {ACPI_VIDEO_HID, 0},
  97         {"", 0},
  98 };
  99 MODULE_DEVICE_TABLE(acpi, video_device_ids);
 100
 101 static struct acpi_driver acpi_video_bus = {
 102         .name = "video",
 103         .class = ACPI_VIDEO_CLASS,
 104         .ids = video_device_ids,
 105         .ops = {
 106                 .add = acpi_video_bus_add,
 107                 .remove = acpi_video_bus_remove,
 108                 .notify = acpi_video_bus_notify,
 109                 },
 110 };
 111
 112 struct acpi_video_bus_flags {
 113         u8 multihead:1;         /* can switch video heads */
 114         u8 rom:1;               /* can retrieve a video rom */
 115         u8 post:1;              /* can configure the head to */
 116         u8 reserved:5;
 117 };
 118
 119 struct acpi_video_bus_cap {
 120         u8 _DOS:1;              /*Enable/Disable output switching */
 121         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 122         u8 _ROM:1;              /*Get ROM Data */
 123         u8 _GPD:1;              /*Get POST Device */
 124         u8 _SPD:1;              /*Set POST Device */
 125         u8 _VPO:1;              /*Video POST Options */
 126         u8 reserved:2;
 127 };
 128
 129 struct acpi_video_device_attrib {
 130         u32 display_index:4;    /* A zero-based instance of the Display */
 131         u32 display_port_attachment:4;  /*This field differentiates the display type */
 132         u32 display_type:4;     /*Describe the specific type in use */
 133         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 134         u32 bios_can_detect:1;  /*BIOS can detect the device */
 135         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 136                                    the VGA device. */
 137         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 138         u32 reserved:10;        /*Must be 0 */
 139         u32 device_id_scheme:1; /*Device ID Scheme */
 140 };
 141
 142 struct acpi_video_enumerated_device {
 143         union {
 144                 u32 int_val;
 145                 struct acpi_video_device_attrib attrib;
 146         } value;
 147         struct acpi_video_device *bind_info;
 148 };
 149
 150 struct acpi_video_bus {
 151         struct acpi_device *device;
 152         u8 dos_setting;
 153         struct acpi_video_enumerated_device *attached_array;
 154         u8 attached_count;
 155         struct acpi_video_bus_cap cap;
 156         struct acpi_video_bus_flags flags;
 157         struct list_head video_device_list;
 158         struct mutex device_list_lock;  /* protects video_device_list */
 159         struct input_dev *input;
 160         char phys[32];  /* for input device */
 161         struct notifier_block pm_nb;
 162 };
 163
 164 struct acpi_video_device_flags {
 165         u8 crt:1;
 166         u8 lcd:1;
 167         u8 tvout:1;
 168         u8 dvi:1;
 169         u8 bios:1;
 170         u8 unknown:1;
 171         u8 reserved:2;
 172 };
 173
 174 struct acpi_video_device_cap {
 175         u8 _ADR:1;              /*Return the unique ID */
 176         u8 _BCL:1;              /*Query list of brightness control levels supported */
 177         u8 _BCM:1;              /*Set the brightness level */
 178         u8 _BQC:1;              /* Get current brightness level */
 179         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 180         u8 _DDC:1;              /*Return the EDID for this device */
 181 };
 182
 183 struct acpi_video_brightness_flags {
 184         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 185         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 186         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 187         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 188         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 189 };
 190
 191 struct acpi_video_device_brightness {
 192         int curr;
 193         int count;
 194         int *levels;
 195         struct acpi_video_brightness_flags flags;
 196 };
 197
 198 struct acpi_video_device {
 199         unsigned long device_id;
 200         struct acpi_video_device_flags flags;
 201         struct acpi_video_device_cap cap;
 202         struct list_head entry;
 203         struct acpi_video_bus *video;
 204         struct acpi_device *dev;
 205         struct acpi_video_device_brightness *brightness;
 206         struct backlight_device *backlight;
 207         struct thermal_cooling_device *cooling_dev;
 208 };
 209
 210 static const char device_decode[][30] = {
 211         "motherboard VGA device",
 212         "PCI VGA device",
 213         "AGP VGA device",
 214         "UNKNOWN",
 215 };
 216
 217 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 218 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 219 static void acpi_video_device_bind(struct acpi_video_bus *video,
 220                                    struct acpi_video_device *device);
 221 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 222 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 223                         int level);
 224 static int acpi_video_device_lcd_get_level_current(
 225                         struct acpi_video_device *device,
 226                         unsigned long long *level, int init);
 227 static int acpi_video_get_next_level(struct acpi_video_device *device,
 228                                      u32 level_current, u32 event);
 229 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 230                                          int event);
 231
 232 /*backlight device sysfs support*/
 233 static int acpi_video_get_brightness(struct backlight_device *bd)
 234 {
 235         unsigned long long cur_level;
 236         int i;
 237         struct acpi_video_device *vd =
 238                 (struct acpi_video_device *)bl_get_data(bd);
 239
 240         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
 241                 return -EINVAL;
 242         for (i = 2; i < vd->brightness->count; i++) {
 243                 if (vd->brightness->levels[i] == cur_level)
 244                         /* The first two entries are special - see page 575
 245                            of the ACPI spec 3.0 */
 246                         return i-2;
 247         }
 248         return 0;
 249 }
 250
 251 static int acpi_video_set_brightness(struct backlight_device *bd)
 252 {
 253         int request_level = bd->props.brightness + 2;
 254         struct acpi_video_device *vd =
 255                 (struct acpi_video_device *)bl_get_data(bd);
 256
 257         return acpi_video_device_lcd_set_level(vd,
 258                                 vd->brightness->levels[request_level]);
 259 }
 260
 261 static const struct backlight_ops acpi_backlight_ops = {
 262         .get_brightness = acpi_video_get_brightness,
 263         .update_status  = acpi_video_set_brightness,
 264 };
 265
 266 /* thermal cooling device callbacks */
 267 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 268                                long *state)
 269 {
 270         struct acpi_device *device = cooling_dev->devdata;
 271         struct acpi_video_device *video = acpi_driver_data(device);
 272
 273         *state = video->brightness->count - 3;
 274         return 0;
 275 }
 276
 277 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 278                                long *state)
 279 {
 280         struct acpi_device *device = cooling_dev->devdata;
 281         struct acpi_video_device *video = acpi_driver_data(device);
 282         unsigned long long level;
 283         int offset;
 284
 285         if (acpi_video_device_lcd_get_level_current(video, &level, 0))
 286                 return -EINVAL;
 287         for (offset = 2; offset < video->brightness->count; offset++)
 288                 if (level == video->brightness->levels[offset]) {
 289                         *state = video->brightness->count - offset - 1;
 290                         return 0;
 291                 }
 292
 293         return -EINVAL;
 294 }
 295
 296 static int
 297 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 298 {
 299         struct acpi_device *device = cooling_dev->devdata;
 300         struct acpi_video_device *video = acpi_driver_data(device);
 301         int level;
 302
 303         if ( state >= video->brightness->count - 2)
 304                 return -EINVAL;
 305
 306         state = video->brightness->count - state;
 307         level = video->brightness->levels[state -1];
 308         return acpi_video_device_lcd_set_level(video, level);
 309 }
 310
 311 static struct thermal_cooling_device_ops video_cooling_ops = {
 312         .get_max_state = video_get_max_state,
 313         .get_cur_state = video_get_cur_state,
 314         .set_cur_state = video_set_cur_state,
 315 };
 316
 317 /* --------------------------------------------------------------------------
 318                                Video Management
 319    -------------------------------------------------------------------------- */
 320
 321 static int
 322 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 323                                    union acpi_object **levels)
 324 {
 325         int status;
 326         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 327         union acpi_object *obj;
 328
 329
 330         *levels = NULL;
 331
 332         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 333         if (!ACPI_SUCCESS(status))
 334                 return status;
 335         obj = (union acpi_object *)buffer.pointer;
 336         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 337                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 338                 status = -EFAULT;
 339                 goto err;
 340         }
 341
 342         *levels = obj;
 343
 344         return 0;
 345
 346       err:
 347         kfree(buffer.pointer);
 348
 349         return status;
 350 }
 351
 352 static int
 353 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 354 {
 355         int status;
 356         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 357         struct acpi_object_list args = { 1, &arg0 };
 358         int state;
 359
 360         arg0.integer.value = level;
 361
 362         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 363                                       &args, NULL);
 364         if (ACPI_FAILURE(status)) {
 365                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 366                 return -EIO;
 367         }
 368
 369         device->brightness->curr = level;
 370         for (state = 2; state < device->brightness->count; state++)
 371                 if (level == device->brightness->levels[state]) {
 372                         if (device->backlight)
 373                                 device->backlight->props.brightness = state - 2;
 374                         return 0;
 375                 }
 376
 377         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 378         return -EINVAL;
 379 }
 380
 381 /*
 382  * For some buggy _BQC methods, we need to add a constant value to
 383  * the _BQC return value to get the actual current brightness level
 384  */
 385
 386 static int bqc_offset_aml_bug_workaround;
 387 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 388 {
 389         bqc_offset_aml_bug_workaround = 9;
 390         return 0;
 391 }
 392
 393 static struct dmi_system_id video_dmi_table[] __initdata = {
 394         /*
 395          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 396          */
 397         {
 398          .callback = video_set_bqc_offset,
 399          .ident = "Acer Aspire 5720",
 400          .matches = {
 401                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 402                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 403                 },
 404         },
 405         {
 406          .callback = video_set_bqc_offset,
 407          .ident = "Acer Aspire 5710Z",
 408          .matches = {
 409                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 410                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 411                 },
 412         },
 413         {
 414          .callback = video_set_bqc_offset,
 415          .ident = "eMachines E510",
 416          .matches = {
 417                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 418                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 419                 },
 420         },
 421         {
 422          .callback = video_set_bqc_offset,
 423          .ident = "Acer Aspire 5315",
 424          .matches = {
 425                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 426                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 427                 },
 428         },
 429         {
 430          .callback = video_set_bqc_offset,
 431          .ident = "Acer Aspire 7720",
 432          .matches = {
 433                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 434                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 435                 },
 436         },
 437         {}
 438 };
 439
 440 static int
 441 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 442                                         unsigned long long *level, int init)
 443 {
 444         acpi_status status = AE_OK;
 445         int i;
 446
 447         if (device->cap._BQC || device->cap._BCQ) {
 448                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 449
 450                 status = acpi_evaluate_integer(device->dev->handle, buf,
 451                                                 NULL, level);
 452                 if (ACPI_SUCCESS(status)) {
 453                         if (device->brightness->flags._BQC_use_index) {
 454                                 if (device->brightness->flags._BCL_reversed)
 455                                         *level = device->brightness->count
 456                                                                  - 3 - (*level);
 457                                 *level = device->brightness->levels[*level + 2];
 458
 459                         }
 460                         *level += bqc_offset_aml_bug_workaround;
 461                         for (i = 2; i < device->brightness->count; i++)
 462                                 if (device->brightness->levels[i] == *level) {
 463                                         device->brightness->curr = *level;
 464                                         return 0;
 465                         }
 466                         if (!init) {
 467                                 /*
 468                                  * BQC returned an invalid level.
 469                                  * Stop using it.
 470                                  */
 471                                 ACPI_WARNING((AE_INFO,
 472                                               "%s returned an invalid level",
 473                                               buf));
 474                                 device->cap._BQC = device->cap._BCQ = 0;
 475                         }
 476                 } else {
 477                         /* Fixme:
 478                          * should we return an error or ignore this failure?
 479                          * dev->brightness->curr is a cached value which stores
 480                          * the correct current backlight level in most cases.
 481                          * ACPI video backlight still works w/ buggy _BQC.
 482                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 483                          */
 484                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 485                         device->cap._BQC = device->cap._BCQ = 0;
 486                 }
 487         }
 488
 489         *level = device->brightness->curr;
 490         return 0;
 491 }
 492
 493 static int
 494 acpi_video_device_EDID(struct acpi_video_device *device,
 495                        union acpi_object **edid, ssize_t length)
 496 {
 497         int status;
 498         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 499         union acpi_object *obj;
 500         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 501         struct acpi_object_list args = { 1, &arg0 };
 502
 503
 504         *edid = NULL;
 505
 506         if (!device)
 507                 return -ENODEV;
 508         if (length == 128)
 509                 arg0.integer.value = 1;
 510         else if (length == 256)
 511                 arg0.integer.value = 2;
 512         else
 513                 return -EINVAL;
 514
 515         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 516         if (ACPI_FAILURE(status))
 517                 return -ENODEV;
 518
 519         obj = buffer.pointer;
 520
 521         if (obj && obj->type == ACPI_TYPE_BUFFER)
 522                 *edid = obj;
 523         else {
 524                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 525                 status = -EFAULT;
 526                 kfree(obj);
 527         }
 528
 529         return status;
 530 }
 531
 532 /* bus */
 533
 534 /*
 535  *  Arg:
 536  *      video           : video bus device pointer
 537  *      bios_flag       :
 538  *              0.      The system BIOS should NOT automatically switch(toggle)
 539  *                      the active display output.
 540  *              1.      The system BIOS should automatically switch (toggle) the
 541  *                      active display output. No switch event.
 542  *              2.      The _DGS value should be locked.
 543  *              3.      The system BIOS should not automatically switch (toggle) the
 544  *                      active display output, but instead generate the display switch
 545  *                      event notify code.
 546  *      lcd_flag        :
 547  *              0.      The system BIOS should automatically control the brightness level
 548  *                      of the LCD when the power changes from AC to DC
 549  *              1.      The system BIOS should NOT automatically control the brightness
 550  *                      level of the LCD when the power changes from AC to DC.
 551  * Return Value:
 552  *              -1      wrong arg.
 553  */
 554
 555 static int
 556 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 557 {
 558         u64 status = 0;
 559         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 560         struct acpi_object_list args = { 1, &arg0 };
 561
 562
 563         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 564                 status = -1;
 565                 goto Failed;
 566         }
 567         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 568         video->dos_setting = arg0.integer.value;
 569         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 570
 571       Failed:
 572         return status;
 573 }
 574
 575 /*
 576  * Simple comparison function used to sort backlight levels.
 577  */
 578
 579 static int
 580 acpi_video_cmp_level(const void *a, const void *b)
 581 {
 582         return *(int *)a - *(int *)b;
 583 }
 584
 585 /*
 586  *  Arg:
 587  *      device  : video output device (LCD, CRT, ..)
 588  *
 589  *  Return Value:
 590  *      Maximum brightness level
 591  *
 592  *  Allocate and initialize device->brightness.
 593  */
 594
 595 static int
 596 acpi_video_init_brightness(struct acpi_video_device *device)
 597 {
 598         union acpi_object *obj = NULL;
 599         int i, max_level = 0, count = 0, level_ac_battery = 0;
 600         unsigned long long level, level_old;
 601         union acpi_object *o;
 602         struct acpi_video_device_brightness *br = NULL;
 603         int result = -EINVAL;
 604
 605         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 606                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 607                                                 "LCD brightness level\n"));
 608                 goto out;
 609         }
 610
 611         if (obj->package.count < 2)
 612                 goto out;
 613
 614         br = kzalloc(sizeof(*br), GFP_KERNEL);
 615         if (!br) {
 616                 printk(KERN_ERR "can't allocate memory\n");
 617                 result = -ENOMEM;
 618                 goto out;
 619         }
 620
 621         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 622                                 GFP_KERNEL);
 623         if (!br->levels) {
 624                 result = -ENOMEM;
 625                 goto out_free;
 626         }
 627
 628         for (i = 0; i < obj->package.count; i++) {
 629                 o = (union acpi_object *)&obj->package.elements[i];
 630                 if (o->type != ACPI_TYPE_INTEGER) {
 631                         printk(KERN_ERR PREFIX "Invalid data\n");
 632                         continue;
 633                 }
 634                 br->levels[count] = (u32) o->integer.value;
 635
 636                 if (br->levels[count] > max_level)
 637                         max_level = br->levels[count];
 638                 count++;
 639         }
 640
 641         /*
 642          * some buggy BIOS don't export the levels
 643          * when machine is on AC/Battery in _BCL package.
 644          * In this case, the first two elements in _BCL packages
 645          * are also supported brightness levels that OS should take care of.
 646          */
 647         for (i = 2; i < count; i++) {
 648                 if (br->levels[i] == br->levels[0])
 649                         level_ac_battery++;
 650                 if (br->levels[i] == br->levels[1])
 651                         level_ac_battery++;
 652         }
 653
 654         if (level_ac_battery < 2) {
 655                 level_ac_battery = 2 - level_ac_battery;
 656                 br->flags._BCL_no_ac_battery_levels = 1;
 657                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 658                         br->levels[i] = br->levels[i - level_ac_battery];
 659                 count += level_ac_battery;
 660         } else if (level_ac_battery > 2)
 661                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 662
 663         /* Check if the _BCL package is in a reversed order */
 664         if (max_level == br->levels[2]) {
 665                 br->flags._BCL_reversed = 1;
 666                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 667                         acpi_video_cmp_level, NULL);
 668         } else if (max_level != br->levels[count - 1])
 669                 ACPI_ERROR((AE_INFO,
 670                             "Found unordered _BCL package\n"));
 671
 672         br->count = count;
 673         device->brightness = br;
 674
 675         /* Check the input/output of _BQC/_BCL/_BCM */
 676         if ((max_level < 100) && (max_level <= (count - 2)))
 677                 br->flags._BCL_use_index = 1;
 678
 679         /*
 680          * _BCM is always consistent with _BCL,
 681          * at least for all the laptops we have ever seen.
 682          */
 683         br->flags._BCM_use_index = br->flags._BCL_use_index;
 684
 685         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 686         br->curr = level = max_level;
 687
 688         if (!device->cap._BQC)
 689                 goto set_level;
 690
 691         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 692         if (result)
 693                 goto out_free_levels;
 694
 695         /*
 696          * Set the level to maximum and check if _BQC uses indexed value
 697          */
 698         result = acpi_video_device_lcd_set_level(device, max_level);
 699         if (result)
 700                 goto out_free_levels;
 701
 702         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 703         if (result)
 704                 goto out_free_levels;
 705
 706         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 707
 708         if (!br->flags._BQC_use_index) {
 709                 /*
 710                  * Set the backlight to the initial state.
 711                  * On some buggy laptops, _BQC returns an uninitialized value
 712                  * when invoked for the first time, i.e. level_old is invalid.
 713                  * set the backlight to max_level in this case
 714                  */
 715                 if (use_bios_initial_backlight) {
 716                         for (i = 2; i < br->count; i++)
 717                                 if (level_old == br->levels[i])
 718                                         level = level_old;
 719                 }
 720                 goto set_level;
 721         }
 722
 723         if (br->flags._BCL_reversed)
 724                 level_old = (br->count - 1) - level_old;
 725         level = br->levels[level_old];
 726
 727 set_level:
 728         result = acpi_video_device_lcd_set_level(device, level);
 729         if (result)
 730                 goto out_free_levels;
 731
 732         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 733                           "found %d brightness levels\n", count - 2));
 734         kfree(obj);
 735         return result;
 736
 737 out_free_levels:
 738         kfree(br->levels);
 739 out_free:
 740         kfree(br);
 741 out:
 742         device->brightness = NULL;
 743         kfree(obj);
 744         return result;
 745 }
 746
 747 /*
 748  *  Arg:
 749  *      device  : video output device (LCD, CRT, ..)
 750  *
 751  *  Return Value:
 752  *      None
 753  *
 754  *  Find out all required AML methods defined under the output
 755  *  device.
 756  */
 757
 758 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 759 {
 760         acpi_handle h_dummy1;
 761
 762         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 763                 device->cap._ADR = 1;
 764         }
 765         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 766                 device->cap._BCL = 1;
 767         }
 768         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 769                 device->cap._BCM = 1;
 770         }
 771         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 772                 device->cap._BQC = 1;
 773         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 774                                 &h_dummy1))) {
 775                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 776                 device->cap._BCQ = 1;
 777         }
 778
 779         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 780                 device->cap._DDC = 1;
 781         }
 782
 783         if (acpi_video_backlight_support()) {
 784                 struct backlight_properties props;
 785                 struct pci_dev *pdev;
 786                 acpi_handle acpi_parent;
 787                 struct device *parent = NULL;
 788                 int result;
 789                 static int count = 0;
 790                 char *name;
 791
 792                 result = acpi_video_init_brightness(device);
 793                 if (result)
 794                         return;
 795                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 796                 if (!name)
 797                         return;
 798                 count++;
 799
 800                 acpi_get_parent(device->dev->handle, &acpi_parent);
 801
 802                 pdev = acpi_get_pci_dev(acpi_parent);
 803                 if (pdev) {
 804                         parent = &pdev->dev;
 805                         pci_dev_put(pdev);
 806                 }
 807
 808                 memset(&props, 0, sizeof(struct backlight_properties));
 809                 props.type = BACKLIGHT_FIRMWARE;
 810                 props.max_brightness = device->brightness->count - 3;
 811                 device->backlight = backlight_device_register(name,
 812                                                               parent,
 813                                                               device,
 814                                                               &acpi_backlight_ops,
 815                                                               &props);
 816                 kfree(name);
 817                 if (IS_ERR(device->backlight))
 818                         return;
 819
 820                 /*
 821                  * Save current brightness level in case we have to restore it
 822                  * before acpi_video_device_lcd_set_level() is called next time.
 823                  */
 824                 device->backlight->props.brightness =
 825                                 acpi_video_get_brightness(device->backlight);
 826
 827                 result = sysfs_create_link(&device->backlight->dev.kobj,
 828                                            &device->dev->dev.kobj, "device");
 829                 if (result)
 830                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 831
 832                 device->cooling_dev = thermal_cooling_device_register("LCD",
 833                                         device->dev, &video_cooling_ops);
 834                 if (IS_ERR(device->cooling_dev)) {
 835                         /*
 836                          * Set cooling_dev to NULL so we don't crash trying to
 837                          * free it.
 838                          * Also, why the hell we are returning early and
 839                          * not attempt to register video output if cooling
 840                          * device registration failed?
 841                          * -- dtor
 842                          */
 843                         device->cooling_dev = NULL;
 844                         return;
 845                 }
 846
 847                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 848                          device->cooling_dev->id);
 849                 result = sysfs_create_link(&device->dev->dev.kobj,
 850                                 &device->cooling_dev->device.kobj,
 851                                 "thermal_cooling");
 852                 if (result)
 853                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 854                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 855                                 &device->dev->dev.kobj, "device");
 856                 if (result)
 857                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 858
 859         }
 860 }
 861
 862 /*
 863  *  Arg:
 864  *      device  : video output device (VGA)
 865  *
 866  *  Return Value:
 867  *      None
 868  *
 869  *  Find out all required AML methods defined under the video bus device.
 870  */
 871
 872 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 873 {
 874         acpi_handle h_dummy1;
 875
 876         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 877                 video->cap._DOS = 1;
 878         }
 879         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 880                 video->cap._DOD = 1;
 881         }
 882         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 883                 video->cap._ROM = 1;
 884         }
 885         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 886                 video->cap._GPD = 1;
 887         }
 888         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 889                 video->cap._SPD = 1;
 890         }
 891         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 892                 video->cap._VPO = 1;
 893         }
 894 }
 895
 896 /*
 897  * Check whether the video bus device has required AML method to
 898  * support the desired features
 899  */
 900
 901 static int acpi_video_bus_check(struct acpi_video_bus *video)
 902 {
 903         acpi_status status = -ENOENT;
 904         struct pci_dev *dev;
 905
 906         if (!video)
 907                 return -EINVAL;
 908
 909         dev = acpi_get_pci_dev(video->device->handle);
 910         if (!dev)
 911                 return -ENODEV;
 912         pci_dev_put(dev);
 913
 914         /* Since there is no HID, CID and so on for VGA driver, we have
 915          * to check well known required nodes.
 916          */
 917
 918         /* Does this device support video switching? */
 919         if (video->cap._DOS || video->cap._DOD) {
 920                 if (!video->cap._DOS) {
 921                         printk(KERN_WARNING FW_BUG
 922                                 "ACPI(%s) defines _DOD but not _DOS\n",
 923                                 acpi_device_bid(video->device));
 924                 }
 925                 video->flags.multihead = 1;
 926                 status = 0;
 927         }
 928
 929         /* Does this device support retrieving a video ROM? */
 930         if (video->cap._ROM) {
 931                 video->flags.rom = 1;
 932                 status = 0;
 933         }
 934
 935         /* Does this device support configuring which video device to POST? */
 936         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 937                 video->flags.post = 1;
 938                 status = 0;
 939         }
 940
 941         return status;
 942 }
 943
 944 /* --------------------------------------------------------------------------
 945                                  Driver Interface
 946    -------------------------------------------------------------------------- */
 947
 948 /* device interface */
 949 static struct acpi_video_device_attrib*
 950 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 951 {
 952         struct acpi_video_enumerated_device *ids;
 953         int i;
 954
 955         for (i = 0; i < video->attached_count; i++) {
 956                 ids = &video->attached_array[i];
 957                 if ((ids->value.int_val & 0xffff) == device_id)
 958                         return &ids->value.attrib;
 959         }
 960
 961         return NULL;
 962 }
 963
 964 static int
 965 acpi_video_get_device_type(struct acpi_video_bus *video,
 966                            unsigned long device_id)
 967 {
 968         struct acpi_video_enumerated_device *ids;
 969         int i;
 970
 971         for (i = 0; i < video->attached_count; i++) {
 972                 ids = &video->attached_array[i];
 973                 if ((ids->value.int_val & 0xffff) == device_id)
 974                         return ids->value.int_val;
 975         }
 976
 977         return 0;
 978 }
 979
 980 static int
 981 acpi_video_bus_get_one_device(struct acpi_device *device,
 982                               struct acpi_video_bus *video)
 983 {
 984         unsigned long long device_id;
 985         int status, device_type;
 986         struct acpi_video_device *data;
 987         struct acpi_video_device_attrib* attribute;
 988
 989         if (!device || !video)
 990                 return -EINVAL;
 991
 992         status =
 993             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
 994         if (ACPI_SUCCESS(status)) {
 995
 996                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
 997                 if (!data)
 998                         return -ENOMEM;
 999
1000                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1001                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1002                 device->driver_data = data;
1003
1004                 data->device_id = device_id;
1005                 data->video = video;
1006                 data->dev = device;
1007
1008                 attribute = acpi_video_get_device_attr(video, device_id);
1009
1010                 if((attribute != NULL) && attribute->device_id_scheme) {
1011                         switch (attribute->display_type) {
1012                         case ACPI_VIDEO_DISPLAY_CRT:
1013                                 data->flags.crt = 1;
1014                                 break;
1015                         case ACPI_VIDEO_DISPLAY_TV:
1016                                 data->flags.tvout = 1;
1017                                 break;
1018                         case ACPI_VIDEO_DISPLAY_DVI:
1019                                 data->flags.dvi = 1;
1020                                 break;
1021                         case ACPI_VIDEO_DISPLAY_LCD:
1022                                 data->flags.lcd = 1;
1023                                 break;
1024                         default:
1025                                 data->flags.unknown = 1;
1026                                 break;
1027                         }
1028                         if(attribute->bios_can_detect)
1029                                 data->flags.bios = 1;
1030                 } else {
1031                         /* Check for legacy IDs */
1032                         device_type = acpi_video_get_device_type(video,
1033                                                                  device_id);
1034                         /* Ignore bits 16 and 18-20 */
1035                         switch (device_type & 0xffe2ffff) {
1036                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1037                                 data->flags.crt = 1;
1038                                 break;
1039                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1040                                 data->flags.lcd = 1;
1041                                 break;
1042                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1043                                 data->flags.tvout = 1;
1044                                 break;
1045                         default:
1046                                 data->flags.unknown = 1;
1047                         }
1048                 }
1049
1050                 acpi_video_device_bind(video, data);
1051                 acpi_video_device_find_cap(data);
1052
1053                 status = acpi_install_notify_handler(device->handle,
1054                                                      ACPI_DEVICE_NOTIFY,
1055                                                      acpi_video_device_notify,
1056                                                      data);
1057                 if (ACPI_FAILURE(status)) {
1058                         printk(KERN_ERR PREFIX
1059                                           "Error installing notify handler\n");
1060                         if(data->brightness)
1061                                 kfree(data->brightness->levels);
1062                         kfree(data->brightness);
1063                         kfree(data);
1064                         return -ENODEV;
1065                 }
1066
1067                 mutex_lock(&video->device_list_lock);
1068                 list_add_tail(&data->entry, &video->video_device_list);
1069                 mutex_unlock(&video->device_list_lock);
1070
1071                 return 0;
1072         }
1073
1074         return -ENOENT;
1075 }
1076
1077 /*
1078  *  Arg:
1079  *      video   : video bus device
1080  *
1081  *  Return:
1082  *      none
1083  *
1084  *  Enumerate the video device list of the video bus,
1085  *  bind the ids with the corresponding video devices
1086  *  under the video bus.
1087  */
1088
1089 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1090 {
1091         struct acpi_video_device *dev;
1092
1093         mutex_lock(&video->device_list_lock);
1094
1095         list_for_each_entry(dev, &video->video_device_list, entry)
1096                 acpi_video_device_bind(video, dev);
1097
1098         mutex_unlock(&video->device_list_lock);
1099 }
1100
1101 /*
1102  *  Arg:
1103  *      video   : video bus device
1104  *      device  : video output device under the video
1105  *              bus
1106  *
1107  *  Return:
1108  *      none
1109  *
1110  *  Bind the ids with the corresponding video devices
1111  *  under the video bus.
1112  */
1113
1114 static void
1115 acpi_video_device_bind(struct acpi_video_bus *video,
1116                        struct acpi_video_device *device)
1117 {
1118         struct acpi_video_enumerated_device *ids;
1119         int i;
1120
1121         for (i = 0; i < video->attached_count; i++) {
1122                 ids = &video->attached_array[i];
1123                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1124                         ids->bind_info = device;
1125                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1126                 }
1127         }
1128 }
1129
1130 /*
1131  *  Arg:
1132  *      video   : video bus device
1133  *
1134  *  Return:
1135  *      < 0     : error
1136  *
1137  *  Call _DOD to enumerate all devices attached to display adapter
1138  *
1139  */
1140
1141 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1142 {
1143         int status;
1144         int count;
1145         int i;
1146         struct acpi_video_enumerated_device *active_list;
1147         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1148         union acpi_object *dod = NULL;
1149         union acpi_object *obj;
1150
1151         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1152         if (!ACPI_SUCCESS(status)) {
1153                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1154                 return status;
1155         }
1156
1157         dod = buffer.pointer;
1158         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1159                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1160                 status = -EFAULT;
1161                 goto out;
1162         }
1163
1164         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1165                           dod->package.count));
1166
1167         active_list = kcalloc(1 + dod->package.count,
1168                               sizeof(struct acpi_video_enumerated_device),
1169                               GFP_KERNEL);
1170         if (!active_list) {
1171                 status = -ENOMEM;
1172                 goto out;
1173         }
1174
1175         count = 0;
1176         for (i = 0; i < dod->package.count; i++) {
1177                 obj = &dod->package.elements[i];
1178
1179                 if (obj->type != ACPI_TYPE_INTEGER) {
1180                         printk(KERN_ERR PREFIX
1181                                 "Invalid _DOD data in element %d\n", i);
1182                         continue;
1183                 }
1184
1185                 active_list[count].value.int_val = obj->integer.value;
1186                 active_list[count].bind_info = NULL;
1187                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1188                                   (int)obj->integer.value));
1189                 count++;
1190         }
1191
1192         kfree(video->attached_array);
1193
1194         video->attached_array = active_list;
1195         video->attached_count = count;
1196
1197  out:
1198         kfree(buffer.pointer);
1199         return status;
1200 }
1201
1202 static int
1203 acpi_video_get_next_level(struct acpi_video_device *device,
1204                           u32 level_current, u32 event)
1205 {
1206         int min, max, min_above, max_below, i, l, delta = 255;
1207         max = max_below = 0;
1208         min = min_above = 255;
1209         /* Find closest level to level_current */
1210         for (i = 2; i < device->brightness->count; i++) {
1211                 l = device->brightness->levels[i];
1212                 if (abs(l - level_current) < abs(delta)) {
1213                         delta = l - level_current;
1214                         if (!delta)
1215                                 break;
1216                 }
1217         }
1218         /* Ajust level_current to closest available level */
1219         level_current += delta;
1220         for (i = 2; i < device->brightness->count; i++) {
1221                 l = device->brightness->levels[i];
1222                 if (l < min)
1223                         min = l;
1224                 if (l > max)
1225                         max = l;
1226                 if (l < min_above && l > level_current)
1227                         min_above = l;
1228                 if (l > max_below && l < level_current)
1229                         max_below = l;
1230         }
1231
1232         switch (event) {
1233         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1234                 return (level_current < max) ? min_above : min;
1235         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1236                 return (level_current < max) ? min_above : max;
1237         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1238                 return (level_current > min) ? max_below : min;
1239         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1240         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1241                 return 0;
1242         default:
1243                 return level_current;
1244         }
1245 }
1246
1247 static int
1248 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1249 {
1250         unsigned long long level_current, level_next;
1251         int result = -EINVAL;
1252
1253         /* no warning message if acpi_backlight=vendor is used */
1254         if (!acpi_video_backlight_support())
1255                 return 0;
1256
1257         if (!device->brightness)
1258                 goto out;
1259
1260         result = acpi_video_device_lcd_get_level_current(device,
1261                                                          &level_current, 0);
1262         if (result)
1263                 goto out;
1264
1265         level_next = acpi_video_get_next_level(device, level_current, event);
1266
1267         result = acpi_video_device_lcd_set_level(device, level_next);
1268
1269         if (!result)
1270                 backlight_force_update(device->backlight,
1271                                        BACKLIGHT_UPDATE_HOTKEY);
1272
1273 out:
1274         if (result)
1275                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1276
1277         return result;
1278 }
1279
1280 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1281                         void **edid)
1282 {
1283         struct acpi_video_bus *video;
1284         struct acpi_video_device *video_device;
1285         union acpi_object *buffer = NULL;
1286         acpi_status status;
1287         int i, length;
1288
1289         if (!device || !acpi_driver_data(device))
1290                 return -EINVAL;
1291
1292         video = acpi_driver_data(device);
1293
1294         for (i = 0; i < video->attached_count; i++) {
1295                 video_device = video->attached_array[i].bind_info;
1296                 length = 256;
1297
1298                 if (!video_device)
1299                         continue;
1300
1301                 if (!video_device->cap._DDC)
1302                         continue;
1303
1304                 if (type) {
1305                         switch (type) {
1306                         case ACPI_VIDEO_DISPLAY_CRT:
1307                                 if (!video_device->flags.crt)
1308                                         continue;
1309                                 break;
1310                         case ACPI_VIDEO_DISPLAY_TV:
1311                                 if (!video_device->flags.tvout)
1312                                         continue;
1313                                 break;
1314                         case ACPI_VIDEO_DISPLAY_DVI:
1315                                 if (!video_device->flags.dvi)
1316                                         continue;
1317                                 break;
1318                         case ACPI_VIDEO_DISPLAY_LCD:
1319                                 if (!video_device->flags.lcd)
1320                                         continue;
1321                                 break;
1322                         }
1323                 } else if (video_device->device_id != device_id) {
1324                         continue;
1325                 }
1326
1327                 status = acpi_video_device_EDID(video_device, &buffer, length);
1328
1329                 if (ACPI_FAILURE(status) || !buffer ||
1330                     buffer->type != ACPI_TYPE_BUFFER) {
1331                         length = 128;
1332                         status = acpi_video_device_EDID(video_device, &buffer,
1333                                                         length);
1334                         if (ACPI_FAILURE(status) || !buffer ||
1335                             buffer->type != ACPI_TYPE_BUFFER) {
1336                                 continue;
1337                         }
1338                 }
1339
1340                 *edid = buffer->buffer.pointer;
1341                 return length;
1342         }
1343
1344         return -ENODEV;
1345 }
1346 EXPORT_SYMBOL(acpi_video_get_edid);
1347
1348 static int
1349 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1350                            struct acpi_device *device)
1351 {
1352         int status = 0;
1353         struct acpi_device *dev;
1354
1355         acpi_video_device_enumerate(video);
1356
1357         list_for_each_entry(dev, &device->children, node) {
1358
1359                 status = acpi_video_bus_get_one_device(dev, video);
1360                 if (ACPI_FAILURE(status)) {
1361                         printk(KERN_WARNING PREFIX
1362                                         "Cant attach device\n");
1363                         continue;
1364                 }
1365         }
1366         return status;
1367 }
1368
1369 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1370 {
1371         acpi_status status;
1372
1373         if (!device || !device->video)
1374                 return -ENOENT;
1375
1376         status = acpi_remove_notify_handler(device->dev->handle,
1377                                             ACPI_DEVICE_NOTIFY,
1378                                             acpi_video_device_notify);
1379         if (ACPI_FAILURE(status)) {
1380                 printk(KERN_WARNING PREFIX
1381                        "Cant remove video notify handler\n");
1382         }
1383         if (device->backlight) {
1384                 sysfs_remove_link(&device->backlight->dev.kobj, "device");
1385                 backlight_device_unregister(device->backlight);
1386                 device->backlight = NULL;
1387         }
1388         if (device->cooling_dev) {
1389                 sysfs_remove_link(&device->dev->dev.kobj,
1390                                   "thermal_cooling");
1391                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1392                                   "device");
1393                 thermal_cooling_device_unregister(device->cooling_dev);
1394                 device->cooling_dev = NULL;
1395         }
1396
1397         return 0;
1398 }
1399
1400 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1401 {
1402         int status;
1403         struct acpi_video_device *dev, *next;
1404
1405         mutex_lock(&video->device_list_lock);
1406
1407         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1408
1409                 status = acpi_video_bus_put_one_device(dev);
1410                 if (ACPI_FAILURE(status))
1411                         printk(KERN_WARNING PREFIX
1412                                "hhuuhhuu bug in acpi video driver.\n");
1413
1414                 if (dev->brightness) {
1415                         kfree(dev->brightness->levels);
1416                         kfree(dev->brightness);
1417                 }
1418                 list_del(&dev->entry);
1419                 kfree(dev);
1420         }
1421
1422         mutex_unlock(&video->device_list_lock);
1423
1424         return 0;
1425 }
1426
1427 /* acpi_video interface */
1428
1429 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1430 {
1431         return acpi_video_bus_DOS(video, 0, 0);
1432 }
1433
1434 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1435 {
1436         return acpi_video_bus_DOS(video, 0, 1);
1437 }
1438
1439 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1440 {
1441         struct acpi_video_bus *video = acpi_driver_data(device);
1442         struct input_dev *input;
1443         int keycode = 0;
1444
1445         if (!video)
1446                 return;
1447
1448         input = video->input;
1449
1450         switch (event) {
1451         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1452                                          * most likely via hotkey. */
1453                 acpi_bus_generate_proc_event(device, event, 0);
1454                 keycode = KEY_SWITCHVIDEOMODE;
1455                 break;
1456
1457         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1458                                          * connector. */
1459                 acpi_video_device_enumerate(video);
1460                 acpi_video_device_rebind(video);
1461                 acpi_bus_generate_proc_event(device, event, 0);
1462                 keycode = KEY_SWITCHVIDEOMODE;
1463                 break;
1464
1465         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1466                 acpi_bus_generate_proc_event(device, event, 0);
1467                 keycode = KEY_SWITCHVIDEOMODE;
1468                 break;
1469         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1470                 acpi_bus_generate_proc_event(device, event, 0);
1471                 keycode = KEY_VIDEO_NEXT;
1472                 break;
1473         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1474                 acpi_bus_generate_proc_event(device, event, 0);
1475                 keycode = KEY_VIDEO_PREV;
1476                 break;
1477
1478         default:
1479                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1480                                   "Unsupported event [0x%x]\n", event));
1481                 break;
1482         }
1483
1484         acpi_notifier_call_chain(device, event, 0);
1485
1486         if (keycode) {
1487                 input_report_key(input, keycode, 1);
1488                 input_sync(input);
1489                 input_report_key(input, keycode, 0);
1490                 input_sync(input);
1491         }
1492
1493         return;
1494 }
1495
1496 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1497 {
1498         struct acpi_video_device *video_device = data;
1499         struct acpi_device *device = NULL;
1500         struct acpi_video_bus *bus;
1501         struct input_dev *input;
1502         int keycode = 0;
1503
1504         if (!video_device)
1505                 return;
1506
1507         device = video_device->dev;
1508         bus = video_device->video;
1509         input = bus->input;
1510
1511         switch (event) {
1512         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1513                 if (brightness_switch_enabled)
1514                         acpi_video_switch_brightness(video_device, event);
1515                 acpi_bus_generate_proc_event(device, event, 0);
1516                 keycode = KEY_BRIGHTNESS_CYCLE;
1517                 break;
1518         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1519                 if (brightness_switch_enabled)
1520                         acpi_video_switch_brightness(video_device, event);
1521                 acpi_bus_generate_proc_event(device, event, 0);
1522                 keycode = KEY_BRIGHTNESSUP;
1523                 break;
1524         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1525                 if (brightness_switch_enabled)
1526                         acpi_video_switch_brightness(video_device, event);
1527                 acpi_bus_generate_proc_event(device, event, 0);
1528                 keycode = KEY_BRIGHTNESSDOWN;
1529                 break;
1530         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightnesss */
1531                 if (brightness_switch_enabled)
1532                         acpi_video_switch_brightness(video_device, event);
1533                 acpi_bus_generate_proc_event(device, event, 0);
1534                 keycode = KEY_BRIGHTNESS_ZERO;
1535                 break;
1536         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1537                 if (brightness_switch_enabled)
1538                         acpi_video_switch_brightness(video_device, event);
1539                 acpi_bus_generate_proc_event(device, event, 0);
1540                 keycode = KEY_DISPLAY_OFF;
1541                 break;
1542         default:
1543                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1544                                   "Unsupported event [0x%x]\n", event));
1545                 break;
1546         }
1547
1548         acpi_notifier_call_chain(device, event, 0);
1549
1550         if (keycode) {
1551                 input_report_key(input, keycode, 1);
1552                 input_sync(input);
1553                 input_report_key(input, keycode, 0);
1554                 input_sync(input);
1555         }
1556
1557         return;
1558 }
1559
1560 static int acpi_video_resume(struct notifier_block *nb,
1561                                 unsigned long val, void *ign)
1562 {
1563         struct acpi_video_bus *video;
1564         struct acpi_video_device *video_device;
1565         int i;
1566
1567         switch (val) {
1568         case PM_HIBERNATION_PREPARE:
1569         case PM_SUSPEND_PREPARE:
1570         case PM_RESTORE_PREPARE:
1571                 return NOTIFY_DONE;
1572         }
1573
1574         video = container_of(nb, struct acpi_video_bus, pm_nb);
1575
1576         dev_info(&video->device->dev, "Restoring backlight state\n");
1577
1578         for (i = 0; i < video->attached_count; i++) {
1579                 video_device = video->attached_array[i].bind_info;
1580                 if (video_device && video_device->backlight)
1581                         acpi_video_set_brightness(video_device->backlight);
1582         }
1583
1584         return NOTIFY_OK;
1585 }
1586
1587 static acpi_status
1588 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1589                         void **return_value)
1590 {
1591         struct acpi_device *device = context;
1592         struct acpi_device *sibling;
1593         int result;
1594
1595         if (handle == device->handle)
1596                 return AE_CTRL_TERMINATE;
1597
1598         result = acpi_bus_get_device(handle, &sibling);
1599         if (result)
1600                 return AE_OK;
1601
1602         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1603                         return AE_ALREADY_EXISTS;
1604
1605         return AE_OK;
1606 }
1607
1608 static int instance;
1609
1610 static int acpi_video_bus_add(struct acpi_device *device)
1611 {
1612         struct acpi_video_bus *video;
1613         struct input_dev *input;
1614         int error;
1615         acpi_status status;
1616
1617         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1618                                 device->parent->handle, 1,
1619                                 acpi_video_bus_match, NULL,
1620                                 device, NULL);
1621         if (status == AE_ALREADY_EXISTS) {
1622                 printk(KERN_WARNING FW_BUG
1623                         "Duplicate ACPI video bus devices for the"
1624                         " same VGA controller, please try module "
1625                         "parameter \"video.allow_duplicates=1\""
1626                         "if the current driver doesn't work.\n");
1627                 if (!allow_duplicates)
1628                         return -ENODEV;
1629         }
1630
1631         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1632         if (!video)
1633                 return -ENOMEM;
1634
1635         /* a hack to fix the duplicate name "VID" problem on T61 */
1636         if (!strcmp(device->pnp.bus_id, "VID")) {
1637                 if (instance)
1638                         device->pnp.bus_id[3] = '0' + instance;
1639                 instance ++;
1640         }
1641         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1642         if (!strcmp(device->pnp.bus_id, "VGA")) {
1643                 if (instance)
1644                         device->pnp.bus_id[3] = '0' + instance;
1645                 instance++;
1646         }
1647
1648         video->device = device;
1649         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1650         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1651         device->driver_data = video;
1652
1653         acpi_video_bus_find_cap(video);
1654         error = acpi_video_bus_check(video);
1655         if (error)
1656                 goto err_free_video;
1657
1658         mutex_init(&video->device_list_lock);
1659         INIT_LIST_HEAD(&video->video_device_list);
1660
1661         acpi_video_bus_get_devices(video, device);
1662         acpi_video_bus_start_devices(video);
1663
1664         video->input = input = input_allocate_device();
1665         if (!input) {
1666                 error = -ENOMEM;
1667                 goto err_stop_video;
1668         }
1669
1670         snprintf(video->phys, sizeof(video->phys),
1671                 "%s/video/input0", acpi_device_hid(video->device));
1672
1673         input->name = acpi_device_name(video->device);
1674         input->phys = video->phys;
1675         input->id.bustype = BUS_HOST;
1676         input->id.product = 0x06;
1677         input->dev.parent = &device->dev;
1678         input->evbit[0] = BIT(EV_KEY);
1679         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1680         set_bit(KEY_VIDEO_NEXT, input->keybit);
1681         set_bit(KEY_VIDEO_PREV, input->keybit);
1682         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1683         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1684         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1685         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1686         set_bit(KEY_DISPLAY_OFF, input->keybit);
1687
1688         error = input_register_device(input);
1689         if (error)
1690                 goto err_free_input_dev;
1691
1692         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1693                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1694                video->flags.multihead ? "yes" : "no",
1695                video->flags.rom ? "yes" : "no",
1696                video->flags.post ? "yes" : "no");
1697
1698         video->pm_nb.notifier_call = acpi_video_resume;
1699         video->pm_nb.priority = 0;
1700         register_pm_notifier(&video->pm_nb);
1701
1702         return 0;
1703
1704  err_free_input_dev:
1705         input_free_device(input);
1706  err_stop_video:
1707         acpi_video_bus_stop_devices(video);
1708         acpi_video_bus_put_devices(video);
1709         kfree(video->attached_array);
1710  err_free_video:
1711         kfree(video);
1712         device->driver_data = NULL;
1713
1714         return error;
1715 }
1716
1717 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1718 {
1719         struct acpi_video_bus *video = NULL;
1720
1721
1722         if (!device || !acpi_driver_data(device))
1723                 return -EINVAL;
1724
1725         video = acpi_driver_data(device);
1726
1727         unregister_pm_notifier(&video->pm_nb);
1728
1729         acpi_video_bus_stop_devices(video);
1730         acpi_video_bus_put_devices(video);
1731
1732         input_unregister_device(video->input);
1733         kfree(video->attached_array);
1734         kfree(video);
1735
1736         return 0;
1737 }
1738
1739 static int __init intel_opregion_present(void)
1740 {
1741 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1742         struct pci_dev *dev = NULL;
1743         u32 address;
1744
1745         for_each_pci_dev(dev) {
1746                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1747                         continue;
1748                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1749                         continue;
1750                 pci_read_config_dword(dev, 0xfc, &address);
1751                 if (!address)
1752                         continue;
1753                 return 1;
1754         }
1755 #endif
1756         return 0;
1757 }
1758
1759 int acpi_video_register(void)
1760 {
1761         int result = 0;
1762         if (register_count) {
1763                 /*
1764                  * if the function of acpi_video_register is already called,
1765                  * don't register the acpi_vide_bus again and return no error.
1766                  */
1767                 return 0;
1768         }
1769
1770         result = acpi_bus_register_driver(&acpi_video_bus);
1771         if (result < 0)
1772                 return -ENODEV;
1773
1774         /*
1775          * When the acpi_video_bus is loaded successfully, increase
1776          * the counter reference.
1777          */
1778         register_count = 1;
1779
1780         return 0;
1781 }
1782 EXPORT_SYMBOL(acpi_video_register);
1783
1784 void acpi_video_unregister(void)
1785 {
1786         if (!register_count) {
1787                 /*
1788                  * If the acpi video bus is already unloaded, don't
1789                  * unload it again and return directly.
1790                  */
1791                 return;
1792         }
1793         acpi_bus_unregister_driver(&acpi_video_bus);
1794
1795         register_count = 0;
1796
1797         return;
1798 }
1799 EXPORT_SYMBOL(acpi_video_unregister);
1800
1801 /*
1802  * This is kind of nasty. Hardware using Intel chipsets may require
1803  * the video opregion code to be run first in order to initialise
1804  * state before any ACPI video calls are made. To handle this we defer
1805  * registration of the video class until the opregion code has run.
1806  */
1807
1808 static int __init acpi_video_init(void)
1809 {
1810         dmi_check_system(video_dmi_table);
1811
1812         if (intel_opregion_present())
1813                 return 0;
1814
1815         return acpi_video_register();
1816 }
1817
1818 static void __exit acpi_video_exit(void)
1819 {
1820         acpi_video_unregister();
1821
1822         return;
1823 }
1824
1825 module_init(acpi_video_init);
1826 module_exit(acpi_video_exit);