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_BUS_NAME             "Video Bus"
  50 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  51 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  52 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  53 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  56
  57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  62
  63 #define MAX_NAME_LEN    20
  64
  65 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  66 ACPI_MODULE_NAME("video");
  67
  68 MODULE_AUTHOR("Bruno Ducrot");
  69 MODULE_DESCRIPTION("ACPI Video Driver");
  70 MODULE_LICENSE("GPL");
  71
  72 static bool brightness_switch_enabled = 1;
  73 module_param(brightness_switch_enabled, bool, 0644);
  74
  75 /*
  76  * By default, we don't allow duplicate ACPI video bus devices
  77  * under the same VGA controller
  78  */
  79 static bool allow_duplicates;
  80 module_param(allow_duplicates, bool, 0644);
  81
  82 /*
  83  * Some BIOSes claim they use minimum backlight at boot,
  84  * and this may bring dimming screen after boot
  85  */
  86 static bool use_bios_initial_backlight = 1;
  87 module_param(use_bios_initial_backlight, bool, 0644);
  88
  89 static int register_count = 0;
  90 static int acpi_video_bus_add(struct acpi_device *device);
  91 static int acpi_video_bus_remove(struct acpi_device *device);
  92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  93
  94 static const struct acpi_device_id video_device_ids[] = {
  95         {ACPI_VIDEO_HID, 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  99
 100 static struct acpi_driver acpi_video_bus = {
 101         .name = "video",
 102         .class = ACPI_VIDEO_CLASS,
 103         .ids = video_device_ids,
 104         .ops = {
 105                 .add = acpi_video_bus_add,
 106                 .remove = acpi_video_bus_remove,
 107                 .notify = acpi_video_bus_notify,
 108                 },
 109 };
 110
 111 struct acpi_video_bus_flags {
 112         u8 multihead:1;         /* can switch video heads */
 113         u8 rom:1;               /* can retrieve a video rom */
 114         u8 post:1;              /* can configure the head to */
 115         u8 reserved:5;
 116 };
 117
 118 struct acpi_video_bus_cap {
 119         u8 _DOS:1;              /*Enable/Disable output switching */
 120         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 121         u8 _ROM:1;              /*Get ROM Data */
 122         u8 _GPD:1;              /*Get POST Device */
 123         u8 _SPD:1;              /*Set POST Device */
 124         u8 _VPO:1;              /*Video POST Options */
 125         u8 reserved:2;
 126 };
 127
 128 struct acpi_video_device_attrib {
 129         u32 display_index:4;    /* A zero-based instance of the Display */
 130         u32 display_port_attachment:4;  /*This field differentiates the display type */
 131         u32 display_type:4;     /*Describe the specific type in use */
 132         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 133         u32 bios_can_detect:1;  /*BIOS can detect the device */
 134         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 135                                    the VGA device. */
 136         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 137         u32 reserved:10;        /*Must be 0 */
 138         u32 device_id_scheme:1; /*Device ID Scheme */
 139 };
 140
 141 struct acpi_video_enumerated_device {
 142         union {
 143                 u32 int_val;
 144                 struct acpi_video_device_attrib attrib;
 145         } value;
 146         struct acpi_video_device *bind_info;
 147 };
 148
 149 struct acpi_video_bus {
 150         struct acpi_device *device;
 151         u8 dos_setting;
 152         struct acpi_video_enumerated_device *attached_array;
 153         u8 attached_count;
 154         struct acpi_video_bus_cap cap;
 155         struct acpi_video_bus_flags flags;
 156         struct list_head video_device_list;
 157         struct mutex device_list_lock;  /* protects video_device_list */
 158         struct input_dev *input;
 159         char phys[32];  /* for input device */
 160         struct notifier_block pm_nb;
 161 };
 162
 163 struct acpi_video_device_flags {
 164         u8 crt:1;
 165         u8 lcd:1;
 166         u8 tvout:1;
 167         u8 dvi:1;
 168         u8 bios:1;
 169         u8 unknown:1;
 170         u8 reserved:2;
 171 };
 172
 173 struct acpi_video_device_cap {
 174         u8 _ADR:1;              /*Return the unique ID */
 175         u8 _BCL:1;              /*Query list of brightness control levels supported */
 176         u8 _BCM:1;              /*Set the brightness level */
 177         u8 _BQC:1;              /* Get current brightness level */
 178         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 179         u8 _DDC:1;              /*Return the EDID for this device */
 180 };
 181
 182 struct acpi_video_brightness_flags {
 183         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 184         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 185         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 186         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 187         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 188 };
 189
 190 struct acpi_video_device_brightness {
 191         int curr;
 192         int count;
 193         int *levels;
 194         struct acpi_video_brightness_flags flags;
 195 };
 196
 197 struct acpi_video_device {
 198         unsigned long device_id;
 199         struct acpi_video_device_flags flags;
 200         struct acpi_video_device_cap cap;
 201         struct list_head entry;
 202         struct acpi_video_bus *video;
 203         struct acpi_device *dev;
 204         struct acpi_video_device_brightness *brightness;
 205         struct backlight_device *backlight;
 206         struct thermal_cooling_device *cooling_dev;
 207 };
 208
 209 static const char device_decode[][30] = {
 210         "motherboard VGA device",
 211         "PCI VGA device",
 212         "AGP VGA device",
 213         "UNKNOWN",
 214 };
 215
 216 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 217 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 218 static void acpi_video_device_bind(struct acpi_video_bus *video,
 219                                    struct acpi_video_device *device);
 220 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 221 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 222                         int level);
 223 static int acpi_video_device_lcd_get_level_current(
 224                         struct acpi_video_device *device,
 225                         unsigned long long *level, int init);
 226 static int acpi_video_get_next_level(struct acpi_video_device *device,
 227                                      u32 level_current, u32 event);
 228 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 229                                          int event);
 230
 231 /*backlight device sysfs support*/
 232 static int acpi_video_get_brightness(struct backlight_device *bd)
 233 {
 234         unsigned long long cur_level;
 235         int i;
 236         struct acpi_video_device *vd =
 237                 (struct acpi_video_device *)bl_get_data(bd);
 238
 239         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
 240                 return -EINVAL;
 241         for (i = 2; i < vd->brightness->count; i++) {
 242                 if (vd->brightness->levels[i] == cur_level)
 243                         /* The first two entries are special - see page 575
 244                            of the ACPI spec 3.0 */
 245                         return i-2;
 246         }
 247         return 0;
 248 }
 249
 250 static int acpi_video_set_brightness(struct backlight_device *bd)
 251 {
 252         int request_level = bd->props.brightness + 2;
 253         struct acpi_video_device *vd =
 254                 (struct acpi_video_device *)bl_get_data(bd);
 255
 256         return acpi_video_device_lcd_set_level(vd,
 257                                 vd->brightness->levels[request_level]);
 258 }
 259
 260 static const struct backlight_ops acpi_backlight_ops = {
 261         .get_brightness = acpi_video_get_brightness,
 262         .update_status  = acpi_video_set_brightness,
 263 };
 264
 265 /* thermal cooling device callbacks */
 266 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 267                                long *state)
 268 {
 269         struct acpi_device *device = cooling_dev->devdata;
 270         struct acpi_video_device *video = acpi_driver_data(device);
 271
 272         *state = video->brightness->count - 3;
 273         return 0;
 274 }
 275
 276 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 277                                long *state)
 278 {
 279         struct acpi_device *device = cooling_dev->devdata;
 280         struct acpi_video_device *video = acpi_driver_data(device);
 281         unsigned long long level;
 282         int offset;
 283
 284         if (acpi_video_device_lcd_get_level_current(video, &level, 0))
 285                 return -EINVAL;
 286         for (offset = 2; offset < video->brightness->count; offset++)
 287                 if (level == video->brightness->levels[offset]) {
 288                         *state = video->brightness->count - offset - 1;
 289                         return 0;
 290                 }
 291
 292         return -EINVAL;
 293 }
 294
 295 static int
 296 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 297 {
 298         struct acpi_device *device = cooling_dev->devdata;
 299         struct acpi_video_device *video = acpi_driver_data(device);
 300         int level;
 301
 302         if ( state >= video->brightness->count - 2)
 303                 return -EINVAL;
 304
 305         state = video->brightness->count - state;
 306         level = video->brightness->levels[state -1];
 307         return acpi_video_device_lcd_set_level(video, level);
 308 }
 309
 310 static const struct thermal_cooling_device_ops video_cooling_ops = {
 311         .get_max_state = video_get_max_state,
 312         .get_cur_state = video_get_cur_state,
 313         .set_cur_state = video_set_cur_state,
 314 };
 315
 316 /* --------------------------------------------------------------------------
 317                                Video Management
 318    -------------------------------------------------------------------------- */
 319
 320 static int
 321 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 322                                    union acpi_object **levels)
 323 {
 324         int status;
 325         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 326         union acpi_object *obj;
 327
 328
 329         *levels = NULL;
 330
 331         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 332         if (!ACPI_SUCCESS(status))
 333                 return status;
 334         obj = (union acpi_object *)buffer.pointer;
 335         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 336                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 337                 status = -EFAULT;
 338                 goto err;
 339         }
 340
 341         *levels = obj;
 342
 343         return 0;
 344
 345       err:
 346         kfree(buffer.pointer);
 347
 348         return status;
 349 }
 350
 351 static int
 352 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 353 {
 354         int status;
 355         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 356         struct acpi_object_list args = { 1, &arg0 };
 357         int state;
 358
 359         arg0.integer.value = level;
 360
 361         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 362                                       &args, NULL);
 363         if (ACPI_FAILURE(status)) {
 364                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 365                 return -EIO;
 366         }
 367
 368         device->brightness->curr = level;
 369         for (state = 2; state < device->brightness->count; state++)
 370                 if (level == device->brightness->levels[state]) {
 371                         if (device->backlight)
 372                                 device->backlight->props.brightness = state - 2;
 373                         return 0;
 374                 }
 375
 376         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 377         return -EINVAL;
 378 }
 379
 380 /*
 381  * For some buggy _BQC methods, we need to add a constant value to
 382  * the _BQC return value to get the actual current brightness level
 383  */
 384
 385 static int bqc_offset_aml_bug_workaround;
 386 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 387 {
 388         bqc_offset_aml_bug_workaround = 9;
 389         return 0;
 390 }
 391
 392 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
 393 {
 394         use_bios_initial_backlight = 0;
 395         return 0;
 396 }
 397
 398 static struct dmi_system_id video_dmi_table[] __initdata = {
 399         /*
 400          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 401          */
 402         {
 403          .callback = video_set_bqc_offset,
 404          .ident = "Acer Aspire 5720",
 405          .matches = {
 406                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 407                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 408                 },
 409         },
 410         {
 411          .callback = video_set_bqc_offset,
 412          .ident = "Acer Aspire 5710Z",
 413          .matches = {
 414                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 415                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 416                 },
 417         },
 418         {
 419          .callback = video_set_bqc_offset,
 420          .ident = "eMachines E510",
 421          .matches = {
 422                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 423                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 424                 },
 425         },
 426         {
 427          .callback = video_set_bqc_offset,
 428          .ident = "Acer Aspire 5315",
 429          .matches = {
 430                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 431                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 432                 },
 433         },
 434         {
 435          .callback = video_set_bqc_offset,
 436          .ident = "Acer Aspire 7720",
 437          .matches = {
 438                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 439                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 440                 },
 441         },
 442         {
 443          .callback = video_ignore_initial_backlight,
 444          .ident = "HP Folio 13-2000",
 445          .matches = {
 446                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 447                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
 448                 },
 449         },
 450         {
 451          .callback = video_ignore_initial_backlight,
 452          .ident = "HP Pavilion dm4",
 453          .matches = {
 454                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 455                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
 456                 },
 457         },
 458         {}
 459 };
 460
 461 static int
 462 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 463                                         unsigned long long *level, int init)
 464 {
 465         acpi_status status = AE_OK;
 466         int i;
 467
 468         if (device->cap._BQC || device->cap._BCQ) {
 469                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 470
 471                 status = acpi_evaluate_integer(device->dev->handle, buf,
 472                                                 NULL, level);
 473                 if (ACPI_SUCCESS(status)) {
 474                         if (device->brightness->flags._BQC_use_index) {
 475                                 if (device->brightness->flags._BCL_reversed)
 476                                         *level = device->brightness->count
 477                                                                  - 3 - (*level);
 478                                 *level = device->brightness->levels[*level + 2];
 479
 480                         }
 481                         *level += bqc_offset_aml_bug_workaround;
 482                         for (i = 2; i < device->brightness->count; i++)
 483                                 if (device->brightness->levels[i] == *level) {
 484                                         device->brightness->curr = *level;
 485                                         return 0;
 486                         }
 487                         if (!init) {
 488                                 /*
 489                                  * BQC returned an invalid level.
 490                                  * Stop using it.
 491                                  */
 492                                 ACPI_WARNING((AE_INFO,
 493                                               "%s returned an invalid level",
 494                                               buf));
 495                                 device->cap._BQC = device->cap._BCQ = 0;
 496                         }
 497                 } else {
 498                         /* Fixme:
 499                          * should we return an error or ignore this failure?
 500                          * dev->brightness->curr is a cached value which stores
 501                          * the correct current backlight level in most cases.
 502                          * ACPI video backlight still works w/ buggy _BQC.
 503                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 504                          */
 505                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 506                         device->cap._BQC = device->cap._BCQ = 0;
 507                 }
 508         }
 509
 510         *level = device->brightness->curr;
 511         return 0;
 512 }
 513
 514 static int
 515 acpi_video_device_EDID(struct acpi_video_device *device,
 516                        union acpi_object **edid, ssize_t length)
 517 {
 518         int status;
 519         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 520         union acpi_object *obj;
 521         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 522         struct acpi_object_list args = { 1, &arg0 };
 523
 524
 525         *edid = NULL;
 526
 527         if (!device)
 528                 return -ENODEV;
 529         if (length == 128)
 530                 arg0.integer.value = 1;
 531         else if (length == 256)
 532                 arg0.integer.value = 2;
 533         else
 534                 return -EINVAL;
 535
 536         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 537         if (ACPI_FAILURE(status))
 538                 return -ENODEV;
 539
 540         obj = buffer.pointer;
 541
 542         if (obj && obj->type == ACPI_TYPE_BUFFER)
 543                 *edid = obj;
 544         else {
 545                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 546                 status = -EFAULT;
 547                 kfree(obj);
 548         }
 549
 550         return status;
 551 }
 552
 553 /* bus */
 554
 555 /*
 556  *  Arg:
 557  *      video           : video bus device pointer
 558  *      bios_flag       :
 559  *              0.      The system BIOS should NOT automatically switch(toggle)
 560  *                      the active display output.
 561  *              1.      The system BIOS should automatically switch (toggle) the
 562  *                      active display output. No switch event.
 563  *              2.      The _DGS value should be locked.
 564  *              3.      The system BIOS should not automatically switch (toggle) the
 565  *                      active display output, but instead generate the display switch
 566  *                      event notify code.
 567  *      lcd_flag        :
 568  *              0.      The system BIOS should automatically control the brightness level
 569  *                      of the LCD when the power changes from AC to DC
 570  *              1.      The system BIOS should NOT automatically control the brightness
 571  *                      level of the LCD when the power changes from AC to DC.
 572  * Return Value:
 573  *              -EINVAL wrong arg.
 574  */
 575
 576 static int
 577 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 578 {
 579         acpi_status status;
 580         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 581         struct acpi_object_list args = { 1, &arg0 };
 582
 583         if (!video->cap._DOS)
 584                 return 0;
 585
 586         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 587                 return -EINVAL;
 588         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 589         video->dos_setting = arg0.integer.value;
 590         status = acpi_evaluate_object(video->device->handle, "_DOS",
 591                 &args, NULL);
 592         if (ACPI_FAILURE(status))
 593                 return -EIO;
 594
 595         return 0;
 596 }
 597
 598 /*
 599  * Simple comparison function used to sort backlight levels.
 600  */
 601
 602 static int
 603 acpi_video_cmp_level(const void *a, const void *b)
 604 {
 605         return *(int *)a - *(int *)b;
 606 }
 607
 608 /*
 609  *  Arg:
 610  *      device  : video output device (LCD, CRT, ..)
 611  *
 612  *  Return Value:
 613  *      Maximum brightness level
 614  *
 615  *  Allocate and initialize device->brightness.
 616  */
 617
 618 static int
 619 acpi_video_init_brightness(struct acpi_video_device *device)
 620 {
 621         union acpi_object *obj = NULL;
 622         int i, max_level = 0, count = 0, level_ac_battery = 0;
 623         unsigned long long level, level_old;
 624         union acpi_object *o;
 625         struct acpi_video_device_brightness *br = NULL;
 626         int result = -EINVAL;
 627
 628         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 629                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 630                                                 "LCD brightness level\n"));
 631                 goto out;
 632         }
 633
 634         if (obj->package.count < 2)
 635                 goto out;
 636
 637         br = kzalloc(sizeof(*br), GFP_KERNEL);
 638         if (!br) {
 639                 printk(KERN_ERR "can't allocate memory\n");
 640                 result = -ENOMEM;
 641                 goto out;
 642         }
 643
 644         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 645                                 GFP_KERNEL);
 646         if (!br->levels) {
 647                 result = -ENOMEM;
 648                 goto out_free;
 649         }
 650
 651         for (i = 0; i < obj->package.count; i++) {
 652                 o = (union acpi_object *)&obj->package.elements[i];
 653                 if (o->type != ACPI_TYPE_INTEGER) {
 654                         printk(KERN_ERR PREFIX "Invalid data\n");
 655                         continue;
 656                 }
 657                 br->levels[count] = (u32) o->integer.value;
 658
 659                 if (br->levels[count] > max_level)
 660                         max_level = br->levels[count];
 661                 count++;
 662         }
 663
 664         /*
 665          * some buggy BIOS don't export the levels
 666          * when machine is on AC/Battery in _BCL package.
 667          * In this case, the first two elements in _BCL packages
 668          * are also supported brightness levels that OS should take care of.
 669          */
 670         for (i = 2; i < count; i++) {
 671                 if (br->levels[i] == br->levels[0])
 672                         level_ac_battery++;
 673                 if (br->levels[i] == br->levels[1])
 674                         level_ac_battery++;
 675         }
 676
 677         if (level_ac_battery < 2) {
 678                 level_ac_battery = 2 - level_ac_battery;
 679                 br->flags._BCL_no_ac_battery_levels = 1;
 680                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 681                         br->levels[i] = br->levels[i - level_ac_battery];
 682                 count += level_ac_battery;
 683         } else if (level_ac_battery > 2)
 684                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 685
 686         /* Check if the _BCL package is in a reversed order */
 687         if (max_level == br->levels[2]) {
 688                 br->flags._BCL_reversed = 1;
 689                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 690                         acpi_video_cmp_level, NULL);
 691         } else if (max_level != br->levels[count - 1])
 692                 ACPI_ERROR((AE_INFO,
 693                             "Found unordered _BCL package"));
 694
 695         br->count = count;
 696         device->brightness = br;
 697
 698         /* Check the input/output of _BQC/_BCL/_BCM */
 699         if ((max_level < 100) && (max_level <= (count - 2)))
 700                 br->flags._BCL_use_index = 1;
 701
 702         /*
 703          * _BCM is always consistent with _BCL,
 704          * at least for all the laptops we have ever seen.
 705          */
 706         br->flags._BCM_use_index = br->flags._BCL_use_index;
 707
 708         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 709         br->curr = level = max_level;
 710
 711         if (!device->cap._BQC)
 712                 goto set_level;
 713
 714         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 715         if (result)
 716                 goto out_free_levels;
 717
 718         /*
 719          * Set the level to maximum and check if _BQC uses indexed value
 720          */
 721         result = acpi_video_device_lcd_set_level(device, max_level);
 722         if (result)
 723                 goto out_free_levels;
 724
 725         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 726         if (result)
 727                 goto out_free_levels;
 728
 729         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 730
 731         if (!br->flags._BQC_use_index) {
 732                 /*
 733                  * Set the backlight to the initial state.
 734                  * On some buggy laptops, _BQC returns an uninitialized value
 735                  * when invoked for the first time, i.e. level_old is invalid.
 736                  * set the backlight to max_level in this case
 737                  */
 738                 if (use_bios_initial_backlight) {
 739                         for (i = 2; i < br->count; i++)
 740                                 if (level_old == br->levels[i])
 741                                         level = level_old;
 742                 }
 743                 goto set_level;
 744         }
 745
 746         if (br->flags._BCL_reversed)
 747                 level_old = (br->count - 1) - level_old;
 748         level = br->levels[level_old];
 749
 750 set_level:
 751         result = acpi_video_device_lcd_set_level(device, level);
 752         if (result)
 753                 goto out_free_levels;
 754
 755         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 756                           "found %d brightness levels\n", count - 2));
 757         kfree(obj);
 758         return result;
 759
 760 out_free_levels:
 761         kfree(br->levels);
 762 out_free:
 763         kfree(br);
 764 out:
 765         device->brightness = NULL;
 766         kfree(obj);
 767         return result;
 768 }
 769
 770 /*
 771  *  Arg:
 772  *      device  : video output device (LCD, CRT, ..)
 773  *
 774  *  Return Value:
 775  *      None
 776  *
 777  *  Find out all required AML methods defined under the output
 778  *  device.
 779  */
 780
 781 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 782 {
 783         acpi_handle h_dummy1;
 784
 785         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 786                 device->cap._ADR = 1;
 787         }
 788         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 789                 device->cap._BCL = 1;
 790         }
 791         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 792                 device->cap._BCM = 1;
 793         }
 794         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 795                 device->cap._BQC = 1;
 796         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 797                                 &h_dummy1))) {
 798                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 799                 device->cap._BCQ = 1;
 800         }
 801
 802         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 803                 device->cap._DDC = 1;
 804         }
 805
 806         if (acpi_video_backlight_support()) {
 807                 struct backlight_properties props;
 808                 struct pci_dev *pdev;
 809                 acpi_handle acpi_parent;
 810                 struct device *parent = NULL;
 811                 int result;
 812                 static int count = 0;
 813                 char *name;
 814
 815                 result = acpi_video_init_brightness(device);
 816                 if (result)
 817                         return;
 818                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 819                 if (!name)
 820                         return;
 821                 count++;
 822
 823                 acpi_get_parent(device->dev->handle, &acpi_parent);
 824
 825                 pdev = acpi_get_pci_dev(acpi_parent);
 826                 if (pdev) {
 827                         parent = &pdev->dev;
 828                         pci_dev_put(pdev);
 829                 }
 830
 831                 memset(&props, 0, sizeof(struct backlight_properties));
 832                 props.type = BACKLIGHT_FIRMWARE;
 833                 props.max_brightness = device->brightness->count - 3;
 834                 device->backlight = backlight_device_register(name,
 835                                                               parent,
 836                                                               device,
 837                                                               &acpi_backlight_ops,
 838                                                               &props);
 839                 kfree(name);
 840                 if (IS_ERR(device->backlight))
 841                         return;
 842
 843                 /*
 844                  * Save current brightness level in case we have to restore it
 845                  * before acpi_video_device_lcd_set_level() is called next time.
 846                  */
 847                 device->backlight->props.brightness =
 848                                 acpi_video_get_brightness(device->backlight);
 849
 850                 device->cooling_dev = thermal_cooling_device_register("LCD",
 851                                         device->dev, &video_cooling_ops);
 852                 if (IS_ERR(device->cooling_dev)) {
 853                         /*
 854                          * Set cooling_dev to NULL so we don't crash trying to
 855                          * free it.
 856                          * Also, why the hell we are returning early and
 857                          * not attempt to register video output if cooling
 858                          * device registration failed?
 859                          * -- dtor
 860                          */
 861                         device->cooling_dev = NULL;
 862                         return;
 863                 }
 864
 865                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 866                          device->cooling_dev->id);
 867                 result = sysfs_create_link(&device->dev->dev.kobj,
 868                                 &device->cooling_dev->device.kobj,
 869                                 "thermal_cooling");
 870                 if (result)
 871                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 872                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 873                                 &device->dev->dev.kobj, "device");
 874                 if (result)
 875                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 876
 877         }
 878 }
 879
 880 /*
 881  *  Arg:
 882  *      device  : video output device (VGA)
 883  *
 884  *  Return Value:
 885  *      None
 886  *
 887  *  Find out all required AML methods defined under the video bus device.
 888  */
 889
 890 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 891 {
 892         acpi_handle h_dummy1;
 893
 894         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 895                 video->cap._DOS = 1;
 896         }
 897         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 898                 video->cap._DOD = 1;
 899         }
 900         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 901                 video->cap._ROM = 1;
 902         }
 903         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 904                 video->cap._GPD = 1;
 905         }
 906         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 907                 video->cap._SPD = 1;
 908         }
 909         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 910                 video->cap._VPO = 1;
 911         }
 912 }
 913
 914 /*
 915  * Check whether the video bus device has required AML method to
 916  * support the desired features
 917  */
 918
 919 static int acpi_video_bus_check(struct acpi_video_bus *video)
 920 {
 921         acpi_status status = -ENOENT;
 922         struct pci_dev *dev;
 923
 924         if (!video)
 925                 return -EINVAL;
 926
 927         dev = acpi_get_pci_dev(video->device->handle);
 928         if (!dev)
 929                 return -ENODEV;
 930         pci_dev_put(dev);
 931
 932         /* Since there is no HID, CID and so on for VGA driver, we have
 933          * to check well known required nodes.
 934          */
 935
 936         /* Does this device support video switching? */
 937         if (video->cap._DOS || video->cap._DOD) {
 938                 if (!video->cap._DOS) {
 939                         printk(KERN_WARNING FW_BUG
 940                                 "ACPI(%s) defines _DOD but not _DOS\n",
 941                                 acpi_device_bid(video->device));
 942                 }
 943                 video->flags.multihead = 1;
 944                 status = 0;
 945         }
 946
 947         /* Does this device support retrieving a video ROM? */
 948         if (video->cap._ROM) {
 949                 video->flags.rom = 1;
 950                 status = 0;
 951         }
 952
 953         /* Does this device support configuring which video device to POST? */
 954         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 955                 video->flags.post = 1;
 956                 status = 0;
 957         }
 958
 959         return status;
 960 }
 961
 962 /* --------------------------------------------------------------------------
 963                                  Driver Interface
 964    -------------------------------------------------------------------------- */
 965
 966 /* device interface */
 967 static struct acpi_video_device_attrib*
 968 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 969 {
 970         struct acpi_video_enumerated_device *ids;
 971         int i;
 972
 973         for (i = 0; i < video->attached_count; i++) {
 974                 ids = &video->attached_array[i];
 975                 if ((ids->value.int_val & 0xffff) == device_id)
 976                         return &ids->value.attrib;
 977         }
 978
 979         return NULL;
 980 }
 981
 982 static int
 983 acpi_video_get_device_type(struct acpi_video_bus *video,
 984                            unsigned long device_id)
 985 {
 986         struct acpi_video_enumerated_device *ids;
 987         int i;
 988
 989         for (i = 0; i < video->attached_count; i++) {
 990                 ids = &video->attached_array[i];
 991                 if ((ids->value.int_val & 0xffff) == device_id)
 992                         return ids->value.int_val;
 993         }
 994
 995         return 0;
 996 }
 997
 998 static int
 999 acpi_video_bus_get_one_device(struct acpi_device *device,
1000                               struct acpi_video_bus *video)
1001 {
1002         unsigned long long device_id;
1003         int status, device_type;
1004         struct acpi_video_device *data;
1005         struct acpi_video_device_attrib* attribute;
1006
1007         if (!device || !video)
1008                 return -EINVAL;
1009
1010         status =
1011             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1012         if (ACPI_SUCCESS(status)) {
1013
1014                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1015                 if (!data)
1016                         return -ENOMEM;
1017
1018                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1019                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1020                 device->driver_data = data;
1021
1022                 data->device_id = device_id;
1023                 data->video = video;
1024                 data->dev = device;
1025
1026                 attribute = acpi_video_get_device_attr(video, device_id);
1027
1028                 if((attribute != NULL) && attribute->device_id_scheme) {
1029                         switch (attribute->display_type) {
1030                         case ACPI_VIDEO_DISPLAY_CRT:
1031                                 data->flags.crt = 1;
1032                                 break;
1033                         case ACPI_VIDEO_DISPLAY_TV:
1034                                 data->flags.tvout = 1;
1035                                 break;
1036                         case ACPI_VIDEO_DISPLAY_DVI:
1037                                 data->flags.dvi = 1;
1038                                 break;
1039                         case ACPI_VIDEO_DISPLAY_LCD:
1040                                 data->flags.lcd = 1;
1041                                 break;
1042                         default:
1043                                 data->flags.unknown = 1;
1044                                 break;
1045                         }
1046                         if(attribute->bios_can_detect)
1047                                 data->flags.bios = 1;
1048                 } else {
1049                         /* Check for legacy IDs */
1050                         device_type = acpi_video_get_device_type(video,
1051                                                                  device_id);
1052                         /* Ignore bits 16 and 18-20 */
1053                         switch (device_type & 0xffe2ffff) {
1054                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1055                                 data->flags.crt = 1;
1056                                 break;
1057                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1058                                 data->flags.lcd = 1;
1059                                 break;
1060                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1061                                 data->flags.tvout = 1;
1062                                 break;
1063                         default:
1064                                 data->flags.unknown = 1;
1065                         }
1066                 }
1067
1068                 acpi_video_device_bind(video, data);
1069                 acpi_video_device_find_cap(data);
1070
1071                 status = acpi_install_notify_handler(device->handle,
1072                                                      ACPI_DEVICE_NOTIFY,
1073                                                      acpi_video_device_notify,
1074                                                      data);
1075                 if (ACPI_FAILURE(status)) {
1076                         printk(KERN_ERR PREFIX
1077                                           "Error installing notify handler\n");
1078                         if(data->brightness)
1079                                 kfree(data->brightness->levels);
1080                         kfree(data->brightness);
1081                         kfree(data);
1082                         return -ENODEV;
1083                 }
1084
1085                 mutex_lock(&video->device_list_lock);
1086                 list_add_tail(&data->entry, &video->video_device_list);
1087                 mutex_unlock(&video->device_list_lock);
1088
1089                 return 0;
1090         }
1091
1092         return -ENOENT;
1093 }
1094
1095 /*
1096  *  Arg:
1097  *      video   : video bus device
1098  *
1099  *  Return:
1100  *      none
1101  *
1102  *  Enumerate the video device list of the video bus,
1103  *  bind the ids with the corresponding video devices
1104  *  under the video bus.
1105  */
1106
1107 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1108 {
1109         struct acpi_video_device *dev;
1110
1111         mutex_lock(&video->device_list_lock);
1112
1113         list_for_each_entry(dev, &video->video_device_list, entry)
1114                 acpi_video_device_bind(video, dev);
1115
1116         mutex_unlock(&video->device_list_lock);
1117 }
1118
1119 /*
1120  *  Arg:
1121  *      video   : video bus device
1122  *      device  : video output device under the video
1123  *              bus
1124  *
1125  *  Return:
1126  *      none
1127  *
1128  *  Bind the ids with the corresponding video devices
1129  *  under the video bus.
1130  */
1131
1132 static void
1133 acpi_video_device_bind(struct acpi_video_bus *video,
1134                        struct acpi_video_device *device)
1135 {
1136         struct acpi_video_enumerated_device *ids;
1137         int i;
1138
1139         for (i = 0; i < video->attached_count; i++) {
1140                 ids = &video->attached_array[i];
1141                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1142                         ids->bind_info = device;
1143                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1144                 }
1145         }
1146 }
1147
1148 /*
1149  *  Arg:
1150  *      video   : video bus device
1151  *
1152  *  Return:
1153  *      < 0     : error
1154  *
1155  *  Call _DOD to enumerate all devices attached to display adapter
1156  *
1157  */
1158
1159 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1160 {
1161         int status;
1162         int count;
1163         int i;
1164         struct acpi_video_enumerated_device *active_list;
1165         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1166         union acpi_object *dod = NULL;
1167         union acpi_object *obj;
1168
1169         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1170         if (!ACPI_SUCCESS(status)) {
1171                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1172                 return status;
1173         }
1174
1175         dod = buffer.pointer;
1176         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1177                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1178                 status = -EFAULT;
1179                 goto out;
1180         }
1181
1182         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1183                           dod->package.count));
1184
1185         active_list = kcalloc(1 + dod->package.count,
1186                               sizeof(struct acpi_video_enumerated_device),
1187                               GFP_KERNEL);
1188         if (!active_list) {
1189                 status = -ENOMEM;
1190                 goto out;
1191         }
1192
1193         count = 0;
1194         for (i = 0; i < dod->package.count; i++) {
1195                 obj = &dod->package.elements[i];
1196
1197                 if (obj->type != ACPI_TYPE_INTEGER) {
1198                         printk(KERN_ERR PREFIX
1199                                 "Invalid _DOD data in element %d\n", i);
1200                         continue;
1201                 }
1202
1203                 active_list[count].value.int_val = obj->integer.value;
1204                 active_list[count].bind_info = NULL;
1205                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1206                                   (int)obj->integer.value));
1207                 count++;
1208         }
1209
1210         kfree(video->attached_array);
1211
1212         video->attached_array = active_list;
1213         video->attached_count = count;
1214
1215  out:
1216         kfree(buffer.pointer);
1217         return status;
1218 }
1219
1220 static int
1221 acpi_video_get_next_level(struct acpi_video_device *device,
1222                           u32 level_current, u32 event)
1223 {
1224         int min, max, min_above, max_below, i, l, delta = 255;
1225         max = max_below = 0;
1226         min = min_above = 255;
1227         /* Find closest level to level_current */
1228         for (i = 2; i < device->brightness->count; i++) {
1229                 l = device->brightness->levels[i];
1230                 if (abs(l - level_current) < abs(delta)) {
1231                         delta = l - level_current;
1232                         if (!delta)
1233                                 break;
1234                 }
1235         }
1236         /* Ajust level_current to closest available level */
1237         level_current += delta;
1238         for (i = 2; i < device->brightness->count; i++) {
1239                 l = device->brightness->levels[i];
1240                 if (l < min)
1241                         min = l;
1242                 if (l > max)
1243                         max = l;
1244                 if (l < min_above && l > level_current)
1245                         min_above = l;
1246                 if (l > max_below && l < level_current)
1247                         max_below = l;
1248         }
1249
1250         switch (event) {
1251         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1252                 return (level_current < max) ? min_above : min;
1253         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1254                 return (level_current < max) ? min_above : max;
1255         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1256                 return (level_current > min) ? max_below : min;
1257         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1258         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1259                 return 0;
1260         default:
1261                 return level_current;
1262         }
1263 }
1264
1265 static int
1266 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1267 {
1268         unsigned long long level_current, level_next;
1269         int result = -EINVAL;
1270
1271         /* no warning message if acpi_backlight=vendor is used */
1272         if (!acpi_video_backlight_support())
1273                 return 0;
1274
1275         if (!device->brightness)
1276                 goto out;
1277
1278         result = acpi_video_device_lcd_get_level_current(device,
1279                                                          &level_current, 0);
1280         if (result)
1281                 goto out;
1282
1283         level_next = acpi_video_get_next_level(device, level_current, event);
1284
1285         result = acpi_video_device_lcd_set_level(device, level_next);
1286
1287         if (!result)
1288                 backlight_force_update(device->backlight,
1289                                        BACKLIGHT_UPDATE_HOTKEY);
1290
1291 out:
1292         if (result)
1293                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1294
1295         return result;
1296 }
1297
1298 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1299                         void **edid)
1300 {
1301         struct acpi_video_bus *video;
1302         struct acpi_video_device *video_device;
1303         union acpi_object *buffer = NULL;
1304         acpi_status status;
1305         int i, length;
1306
1307         if (!device || !acpi_driver_data(device))
1308                 return -EINVAL;
1309
1310         video = acpi_driver_data(device);
1311
1312         for (i = 0; i < video->attached_count; i++) {
1313                 video_device = video->attached_array[i].bind_info;
1314                 length = 256;
1315
1316                 if (!video_device)
1317                         continue;
1318
1319                 if (!video_device->cap._DDC)
1320                         continue;
1321
1322                 if (type) {
1323                         switch (type) {
1324                         case ACPI_VIDEO_DISPLAY_CRT:
1325                                 if (!video_device->flags.crt)
1326                                         continue;
1327                                 break;
1328                         case ACPI_VIDEO_DISPLAY_TV:
1329                                 if (!video_device->flags.tvout)
1330                                         continue;
1331                                 break;
1332                         case ACPI_VIDEO_DISPLAY_DVI:
1333                                 if (!video_device->flags.dvi)
1334                                         continue;
1335                                 break;
1336                         case ACPI_VIDEO_DISPLAY_LCD:
1337                                 if (!video_device->flags.lcd)
1338                                         continue;
1339                                 break;
1340                         }
1341                 } else if (video_device->device_id != device_id) {
1342                         continue;
1343                 }
1344
1345                 status = acpi_video_device_EDID(video_device, &buffer, length);
1346
1347                 if (ACPI_FAILURE(status) || !buffer ||
1348                     buffer->type != ACPI_TYPE_BUFFER) {
1349                         length = 128;
1350                         status = acpi_video_device_EDID(video_device, &buffer,
1351                                                         length);
1352                         if (ACPI_FAILURE(status) || !buffer ||
1353                             buffer->type != ACPI_TYPE_BUFFER) {
1354                                 continue;
1355                         }
1356                 }
1357
1358                 *edid = buffer->buffer.pointer;
1359                 return length;
1360         }
1361
1362         return -ENODEV;
1363 }
1364 EXPORT_SYMBOL(acpi_video_get_edid);
1365
1366 static int
1367 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1368                            struct acpi_device *device)
1369 {
1370         int status = 0;
1371         struct acpi_device *dev;
1372
1373         /*
1374          * There are systems where video module known to work fine regardless
1375          * of broken _DOD and ignoring returned value here doesn't cause
1376          * any issues later.
1377          */
1378         acpi_video_device_enumerate(video);
1379
1380         list_for_each_entry(dev, &device->children, node) {
1381
1382                 status = acpi_video_bus_get_one_device(dev, video);
1383                 if (status) {
1384                         printk(KERN_WARNING PREFIX
1385                                         "Can't attach device\n");
1386                         continue;
1387                 }
1388         }
1389         return status;
1390 }
1391
1392 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1393 {
1394         acpi_status status;
1395
1396         if (!device || !device->video)
1397                 return -ENOENT;
1398
1399         status = acpi_remove_notify_handler(device->dev->handle,
1400                                             ACPI_DEVICE_NOTIFY,
1401                                             acpi_video_device_notify);
1402         if (ACPI_FAILURE(status)) {
1403                 printk(KERN_WARNING PREFIX
1404                        "Can't remove video notify handler\n");
1405         }
1406         if (device->backlight) {
1407                 backlight_device_unregister(device->backlight);
1408                 device->backlight = NULL;
1409         }
1410         if (device->cooling_dev) {
1411                 sysfs_remove_link(&device->dev->dev.kobj,
1412                                   "thermal_cooling");
1413                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1414                                   "device");
1415                 thermal_cooling_device_unregister(device->cooling_dev);
1416                 device->cooling_dev = NULL;
1417         }
1418
1419         return 0;
1420 }
1421
1422 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1423 {
1424         int status;
1425         struct acpi_video_device *dev, *next;
1426
1427         mutex_lock(&video->device_list_lock);
1428
1429         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1430
1431                 status = acpi_video_bus_put_one_device(dev);
1432                 if (ACPI_FAILURE(status))
1433                         printk(KERN_WARNING PREFIX
1434                                "hhuuhhuu bug in acpi video driver.\n");
1435
1436                 if (dev->brightness) {
1437                         kfree(dev->brightness->levels);
1438                         kfree(dev->brightness);
1439                 }
1440                 list_del(&dev->entry);
1441                 kfree(dev);
1442         }
1443
1444         mutex_unlock(&video->device_list_lock);
1445
1446         return 0;
1447 }
1448
1449 /* acpi_video interface */
1450
1451 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1452 {
1453         return acpi_video_bus_DOS(video, 0, 0);
1454 }
1455
1456 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1457 {
1458         return acpi_video_bus_DOS(video, 0, 1);
1459 }
1460
1461 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1462 {
1463         struct acpi_video_bus *video = acpi_driver_data(device);
1464         struct input_dev *input;
1465         int keycode = 0;
1466
1467         if (!video)
1468                 return;
1469
1470         input = video->input;
1471
1472         switch (event) {
1473         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1474                                          * most likely via hotkey. */
1475                 acpi_bus_generate_proc_event(device, event, 0);
1476                 keycode = KEY_SWITCHVIDEOMODE;
1477                 break;
1478
1479         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1480                                          * connector. */
1481                 acpi_video_device_enumerate(video);
1482                 acpi_video_device_rebind(video);
1483                 acpi_bus_generate_proc_event(device, event, 0);
1484                 keycode = KEY_SWITCHVIDEOMODE;
1485                 break;
1486
1487         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1488                 acpi_bus_generate_proc_event(device, event, 0);
1489                 keycode = KEY_SWITCHVIDEOMODE;
1490                 break;
1491         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1492                 acpi_bus_generate_proc_event(device, event, 0);
1493                 keycode = KEY_VIDEO_NEXT;
1494                 break;
1495         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1496                 acpi_bus_generate_proc_event(device, event, 0);
1497                 keycode = KEY_VIDEO_PREV;
1498                 break;
1499
1500         default:
1501                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1502                                   "Unsupported event [0x%x]\n", event));
1503                 break;
1504         }
1505
1506         if (acpi_notifier_call_chain(device, event, 0))
1507                 /* Something vetoed the keypress. */
1508                 keycode = 0;
1509
1510         if (keycode) {
1511                 input_report_key(input, keycode, 1);
1512                 input_sync(input);
1513                 input_report_key(input, keycode, 0);
1514                 input_sync(input);
1515         }
1516
1517         return;
1518 }
1519
1520 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1521 {
1522         struct acpi_video_device *video_device = data;
1523         struct acpi_device *device = NULL;
1524         struct acpi_video_bus *bus;
1525         struct input_dev *input;
1526         int keycode = 0;
1527
1528         if (!video_device)
1529                 return;
1530
1531         device = video_device->dev;
1532         bus = video_device->video;
1533         input = bus->input;
1534
1535         switch (event) {
1536         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
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_BRIGHTNESS_CYCLE;
1541                 break;
1542         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1543                 if (brightness_switch_enabled)
1544                         acpi_video_switch_brightness(video_device, event);
1545                 acpi_bus_generate_proc_event(device, event, 0);
1546                 keycode = KEY_BRIGHTNESSUP;
1547                 break;
1548         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1549                 if (brightness_switch_enabled)
1550                         acpi_video_switch_brightness(video_device, event);
1551                 acpi_bus_generate_proc_event(device, event, 0);
1552                 keycode = KEY_BRIGHTNESSDOWN;
1553                 break;
1554         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1555                 if (brightness_switch_enabled)
1556                         acpi_video_switch_brightness(video_device, event);
1557                 acpi_bus_generate_proc_event(device, event, 0);
1558                 keycode = KEY_BRIGHTNESS_ZERO;
1559                 break;
1560         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1561                 if (brightness_switch_enabled)
1562                         acpi_video_switch_brightness(video_device, event);
1563                 acpi_bus_generate_proc_event(device, event, 0);
1564                 keycode = KEY_DISPLAY_OFF;
1565                 break;
1566         default:
1567                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1568                                   "Unsupported event [0x%x]\n", event));
1569                 break;
1570         }
1571
1572         acpi_notifier_call_chain(device, event, 0);
1573
1574         if (keycode) {
1575                 input_report_key(input, keycode, 1);
1576                 input_sync(input);
1577                 input_report_key(input, keycode, 0);
1578                 input_sync(input);
1579         }
1580
1581         return;
1582 }
1583
1584 static int acpi_video_resume(struct notifier_block *nb,
1585                                 unsigned long val, void *ign)
1586 {
1587         struct acpi_video_bus *video;
1588         struct acpi_video_device *video_device;
1589         int i;
1590
1591         switch (val) {
1592         case PM_HIBERNATION_PREPARE:
1593         case PM_SUSPEND_PREPARE:
1594         case PM_RESTORE_PREPARE:
1595                 return NOTIFY_DONE;
1596         }
1597
1598         video = container_of(nb, struct acpi_video_bus, pm_nb);
1599
1600         dev_info(&video->device->dev, "Restoring backlight state\n");
1601
1602         for (i = 0; i < video->attached_count; i++) {
1603                 video_device = video->attached_array[i].bind_info;
1604                 if (video_device && video_device->backlight)
1605                         acpi_video_set_brightness(video_device->backlight);
1606         }
1607
1608         return NOTIFY_OK;
1609 }
1610
1611 static acpi_status
1612 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1613                         void **return_value)
1614 {
1615         struct acpi_device *device = context;
1616         struct acpi_device *sibling;
1617         int result;
1618
1619         if (handle == device->handle)
1620                 return AE_CTRL_TERMINATE;
1621
1622         result = acpi_bus_get_device(handle, &sibling);
1623         if (result)
1624                 return AE_OK;
1625
1626         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1627                         return AE_ALREADY_EXISTS;
1628
1629         return AE_OK;
1630 }
1631
1632 static int instance;
1633
1634 static int acpi_video_bus_add(struct acpi_device *device)
1635 {
1636         struct acpi_video_bus *video;
1637         struct input_dev *input;
1638         int error;
1639         acpi_status status;
1640
1641         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1642                                 device->parent->handle, 1,
1643                                 acpi_video_bus_match, NULL,
1644                                 device, NULL);
1645         if (status == AE_ALREADY_EXISTS) {
1646                 printk(KERN_WARNING FW_BUG
1647                         "Duplicate ACPI video bus devices for the"
1648                         " same VGA controller, please try module "
1649                         "parameter \"video.allow_duplicates=1\""
1650                         "if the current driver doesn't work.\n");
1651                 if (!allow_duplicates)
1652                         return -ENODEV;
1653         }
1654
1655         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1656         if (!video)
1657                 return -ENOMEM;
1658
1659         /* a hack to fix the duplicate name "VID" problem on T61 */
1660         if (!strcmp(device->pnp.bus_id, "VID")) {
1661                 if (instance)
1662                         device->pnp.bus_id[3] = '0' + instance;
1663                 instance ++;
1664         }
1665         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1666         if (!strcmp(device->pnp.bus_id, "VGA")) {
1667                 if (instance)
1668                         device->pnp.bus_id[3] = '0' + instance;
1669                 instance++;
1670         }
1671
1672         video->device = device;
1673         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1674         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1675         device->driver_data = video;
1676
1677         acpi_video_bus_find_cap(video);
1678         error = acpi_video_bus_check(video);
1679         if (error)
1680                 goto err_free_video;
1681
1682         mutex_init(&video->device_list_lock);
1683         INIT_LIST_HEAD(&video->video_device_list);
1684
1685         error = acpi_video_bus_get_devices(video, device);
1686         if (error)
1687                 goto err_free_video;
1688
1689         video->input = input = input_allocate_device();
1690         if (!input) {
1691                 error = -ENOMEM;
1692                 goto err_put_video;
1693         }
1694
1695         error = acpi_video_bus_start_devices(video);
1696         if (error)
1697                 goto err_free_input_dev;
1698
1699         snprintf(video->phys, sizeof(video->phys),
1700                 "%s/video/input0", acpi_device_hid(video->device));
1701
1702         input->name = acpi_device_name(video->device);
1703         input->phys = video->phys;
1704         input->id.bustype = BUS_HOST;
1705         input->id.product = 0x06;
1706         input->dev.parent = &device->dev;
1707         input->evbit[0] = BIT(EV_KEY);
1708         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1709         set_bit(KEY_VIDEO_NEXT, input->keybit);
1710         set_bit(KEY_VIDEO_PREV, input->keybit);
1711         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1712         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1713         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1714         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1715         set_bit(KEY_DISPLAY_OFF, input->keybit);
1716
1717         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1718                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1719                video->flags.multihead ? "yes" : "no",
1720                video->flags.rom ? "yes" : "no",
1721                video->flags.post ? "yes" : "no");
1722
1723         video->pm_nb.notifier_call = acpi_video_resume;
1724         video->pm_nb.priority = 0;
1725         error = register_pm_notifier(&video->pm_nb);
1726         if (error)
1727                 goto err_stop_video;
1728
1729         error = input_register_device(input);
1730         if (error)
1731                 goto err_unregister_pm_notifier;
1732
1733         return 0;
1734
1735  err_unregister_pm_notifier:
1736         unregister_pm_notifier(&video->pm_nb);
1737  err_stop_video:
1738         acpi_video_bus_stop_devices(video);
1739  err_free_input_dev:
1740         input_free_device(input);
1741  err_put_video:
1742         acpi_video_bus_put_devices(video);
1743         kfree(video->attached_array);
1744  err_free_video:
1745         kfree(video);
1746         device->driver_data = NULL;
1747
1748         return error;
1749 }
1750
1751 static int acpi_video_bus_remove(struct acpi_device *device)
1752 {
1753         struct acpi_video_bus *video = NULL;
1754
1755
1756         if (!device || !acpi_driver_data(device))
1757                 return -EINVAL;
1758
1759         video = acpi_driver_data(device);
1760
1761         unregister_pm_notifier(&video->pm_nb);
1762
1763         acpi_video_bus_stop_devices(video);
1764         acpi_video_bus_put_devices(video);
1765
1766         input_unregister_device(video->input);
1767         kfree(video->attached_array);
1768         kfree(video);
1769
1770         return 0;
1771 }
1772
1773 static int __init is_i740(struct pci_dev *dev)
1774 {
1775         if (dev->device == 0x00D1)
1776                 return 1;
1777         if (dev->device == 0x7000)
1778                 return 1;
1779         return 0;
1780 }
1781
1782 static int __init intel_opregion_present(void)
1783 {
1784         int opregion = 0;
1785         struct pci_dev *dev = NULL;
1786         u32 address;
1787
1788         for_each_pci_dev(dev) {
1789                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1790                         continue;
1791                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1792                         continue;
1793                 /* We don't want to poke around undefined i740 registers */
1794                 if (is_i740(dev))
1795                         continue;
1796                 pci_read_config_dword(dev, 0xfc, &address);
1797                 if (!address)
1798                         continue;
1799                 opregion = 1;
1800         }
1801         return opregion;
1802 }
1803
1804 int acpi_video_register(void)
1805 {
1806         int result = 0;
1807         if (register_count) {
1808                 /*
1809                  * if the function of acpi_video_register is already called,
1810                  * don't register the acpi_vide_bus again and return no error.
1811                  */
1812                 return 0;
1813         }
1814
1815         result = acpi_bus_register_driver(&acpi_video_bus);
1816         if (result < 0)
1817                 return -ENODEV;
1818
1819         /*
1820          * When the acpi_video_bus is loaded successfully, increase
1821          * the counter reference.
1822          */
1823         register_count = 1;
1824
1825         return 0;
1826 }
1827 EXPORT_SYMBOL(acpi_video_register);
1828
1829 void acpi_video_unregister(void)
1830 {
1831         if (!register_count) {
1832                 /*
1833                  * If the acpi video bus is already unloaded, don't
1834                  * unload it again and return directly.
1835                  */
1836                 return;
1837         }
1838         acpi_bus_unregister_driver(&acpi_video_bus);
1839
1840         register_count = 0;
1841
1842         return;
1843 }
1844 EXPORT_SYMBOL(acpi_video_unregister);
1845
1846 /*
1847  * This is kind of nasty. Hardware using Intel chipsets may require
1848  * the video opregion code to be run first in order to initialise
1849  * state before any ACPI video calls are made. To handle this we defer
1850  * registration of the video class until the opregion code has run.
1851  */
1852
1853 static int __init acpi_video_init(void)
1854 {
1855         dmi_check_system(video_dmi_table);
1856
1857         if (intel_opregion_present())
1858                 return 0;
1859
1860         return acpi_video_register();
1861 }
1862
1863 static void __exit acpi_video_exit(void)
1864 {
1865         acpi_video_unregister();
1866
1867         return;
1868 }
1869
1870 module_init(acpi_video_init);
1871 module_exit(acpi_video_exit);