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 int 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 int 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 int 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, int type);
  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          .callback = video_ignore_initial_backlight,
 460          .ident = "HP 1000 Notebook PC",
 461          .matches = {
 462                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 463                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
 464                 },
 465         },
 466         {}
 467 };
 468
 469 static int
 470 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 471                                         unsigned long long *level, int init)
 472 {
 473         acpi_status status = AE_OK;
 474         int i;
 475
 476         if (device->cap._BQC || device->cap._BCQ) {
 477                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 478
 479                 status = acpi_evaluate_integer(device->dev->handle, buf,
 480                                                 NULL, level);
 481                 if (ACPI_SUCCESS(status)) {
 482                         if (device->brightness->flags._BQC_use_index) {
 483                                 if (device->brightness->flags._BCL_reversed)
 484                                         *level = device->brightness->count
 485                                                                  - 3 - (*level);
 486                                 *level = device->brightness->levels[*level + 2];
 487
 488                         }
 489                         *level += bqc_offset_aml_bug_workaround;
 490                         for (i = 2; i < device->brightness->count; i++)
 491                                 if (device->brightness->levels[i] == *level) {
 492                                         device->brightness->curr = *level;
 493                                         return 0;
 494                         }
 495                         if (!init) {
 496                                 /*
 497                                  * BQC returned an invalid level.
 498                                  * Stop using it.
 499                                  */
 500                                 ACPI_WARNING((AE_INFO,
 501                                               "%s returned an invalid level",
 502                                               buf));
 503                                 device->cap._BQC = device->cap._BCQ = 0;
 504                         }
 505                 } else {
 506                         /* Fixme:
 507                          * should we return an error or ignore this failure?
 508                          * dev->brightness->curr is a cached value which stores
 509                          * the correct current backlight level in most cases.
 510                          * ACPI video backlight still works w/ buggy _BQC.
 511                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 512                          */
 513                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 514                         device->cap._BQC = device->cap._BCQ = 0;
 515                 }
 516         }
 517
 518         *level = device->brightness->curr;
 519         return 0;
 520 }
 521
 522 static int
 523 acpi_video_device_EDID(struct acpi_video_device *device,
 524                        union acpi_object **edid, ssize_t length)
 525 {
 526         int status;
 527         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 528         union acpi_object *obj;
 529         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 530         struct acpi_object_list args = { 1, &arg0 };
 531
 532
 533         *edid = NULL;
 534
 535         if (!device)
 536                 return -ENODEV;
 537         if (length == 128)
 538                 arg0.integer.value = 1;
 539         else if (length == 256)
 540                 arg0.integer.value = 2;
 541         else
 542                 return -EINVAL;
 543
 544         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 545         if (ACPI_FAILURE(status))
 546                 return -ENODEV;
 547
 548         obj = buffer.pointer;
 549
 550         if (obj && obj->type == ACPI_TYPE_BUFFER)
 551                 *edid = obj;
 552         else {
 553                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 554                 status = -EFAULT;
 555                 kfree(obj);
 556         }
 557
 558         return status;
 559 }
 560
 561 /* bus */
 562
 563 /*
 564  *  Arg:
 565  *      video           : video bus device pointer
 566  *      bios_flag       :
 567  *              0.      The system BIOS should NOT automatically switch(toggle)
 568  *                      the active display output.
 569  *              1.      The system BIOS should automatically switch (toggle) the
 570  *                      active display output. No switch event.
 571  *              2.      The _DGS value should be locked.
 572  *              3.      The system BIOS should not automatically switch (toggle) the
 573  *                      active display output, but instead generate the display switch
 574  *                      event notify code.
 575  *      lcd_flag        :
 576  *              0.      The system BIOS should automatically control the brightness level
 577  *                      of the LCD when the power changes from AC to DC
 578  *              1.      The system BIOS should NOT automatically control the brightness
 579  *                      level of the LCD when the power changes from AC to DC.
 580  * Return Value:
 581  *              -1      wrong arg.
 582  */
 583
 584 static int
 585 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 586 {
 587         u64 status = 0;
 588         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 589         struct acpi_object_list args = { 1, &arg0 };
 590
 591
 592         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 593                 status = -1;
 594                 goto Failed;
 595         }
 596         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 597         video->dos_setting = arg0.integer.value;
 598         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 599
 600       Failed:
 601         return status;
 602 }
 603
 604 /*
 605  * Simple comparison function used to sort backlight levels.
 606  */
 607
 608 static int
 609 acpi_video_cmp_level(const void *a, const void *b)
 610 {
 611         return *(int *)a - *(int *)b;
 612 }
 613
 614 /*
 615  *  Arg:
 616  *      device  : video output device (LCD, CRT, ..)
 617  *
 618  *  Return Value:
 619  *      Maximum brightness level
 620  *
 621  *  Allocate and initialize device->brightness.
 622  */
 623
 624 static int
 625 acpi_video_init_brightness(struct acpi_video_device *device)
 626 {
 627         union acpi_object *obj = NULL;
 628         int i, max_level = 0, count = 0, level_ac_battery = 0;
 629         unsigned long long level, level_old;
 630         union acpi_object *o;
 631         struct acpi_video_device_brightness *br = NULL;
 632         int result = -EINVAL;
 633
 634         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 635                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 636                                                 "LCD brightness level\n"));
 637                 goto out;
 638         }
 639
 640         if (obj->package.count < 2)
 641                 goto out;
 642
 643         br = kzalloc(sizeof(*br), GFP_KERNEL);
 644         if (!br) {
 645                 printk(KERN_ERR "can't allocate memory\n");
 646                 result = -ENOMEM;
 647                 goto out;
 648         }
 649
 650         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 651                                 GFP_KERNEL);
 652         if (!br->levels) {
 653                 result = -ENOMEM;
 654                 goto out_free;
 655         }
 656
 657         for (i = 0; i < obj->package.count; i++) {
 658                 o = (union acpi_object *)&obj->package.elements[i];
 659                 if (o->type != ACPI_TYPE_INTEGER) {
 660                         printk(KERN_ERR PREFIX "Invalid data\n");
 661                         continue;
 662                 }
 663                 br->levels[count] = (u32) o->integer.value;
 664
 665                 if (br->levels[count] > max_level)
 666                         max_level = br->levels[count];
 667                 count++;
 668         }
 669
 670         /*
 671          * some buggy BIOS don't export the levels
 672          * when machine is on AC/Battery in _BCL package.
 673          * In this case, the first two elements in _BCL packages
 674          * are also supported brightness levels that OS should take care of.
 675          */
 676         for (i = 2; i < count; i++) {
 677                 if (br->levels[i] == br->levels[0])
 678                         level_ac_battery++;
 679                 if (br->levels[i] == br->levels[1])
 680                         level_ac_battery++;
 681         }
 682
 683         if (level_ac_battery < 2) {
 684                 level_ac_battery = 2 - level_ac_battery;
 685                 br->flags._BCL_no_ac_battery_levels = 1;
 686                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 687                         br->levels[i] = br->levels[i - level_ac_battery];
 688                 count += level_ac_battery;
 689         } else if (level_ac_battery > 2)
 690                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 691
 692         /* Check if the _BCL package is in a reversed order */
 693         if (max_level == br->levels[2]) {
 694                 br->flags._BCL_reversed = 1;
 695                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 696                         acpi_video_cmp_level, NULL);
 697         } else if (max_level != br->levels[count - 1])
 698                 ACPI_ERROR((AE_INFO,
 699                             "Found unordered _BCL package\n"));
 700
 701         br->count = count;
 702         device->brightness = br;
 703
 704         /* Check the input/output of _BQC/_BCL/_BCM */
 705         if ((max_level < 100) && (max_level <= (count - 2)))
 706                 br->flags._BCL_use_index = 1;
 707
 708         /*
 709          * _BCM is always consistent with _BCL,
 710          * at least for all the laptops we have ever seen.
 711          */
 712         br->flags._BCM_use_index = br->flags._BCL_use_index;
 713
 714         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 715         br->curr = level = max_level;
 716
 717         if (!device->cap._BQC)
 718                 goto set_level;
 719
 720         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 721         if (result)
 722                 goto out_free_levels;
 723
 724         /*
 725          * Set the level to maximum and check if _BQC uses indexed value
 726          */
 727         result = acpi_video_device_lcd_set_level(device, max_level);
 728         if (result)
 729                 goto out_free_levels;
 730
 731         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 732         if (result)
 733                 goto out_free_levels;
 734
 735         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 736
 737         if (!br->flags._BQC_use_index) {
 738                 /*
 739                  * Set the backlight to the initial state.
 740                  * On some buggy laptops, _BQC returns an uninitialized value
 741                  * when invoked for the first time, i.e. level_old is invalid.
 742                  * set the backlight to max_level in this case
 743                  */
 744                 if (use_bios_initial_backlight) {
 745                         for (i = 2; i < br->count; i++)
 746                                 if (level_old == br->levels[i])
 747                                         level = level_old;
 748                 }
 749                 goto set_level;
 750         }
 751
 752         if (br->flags._BCL_reversed)
 753                 level_old = (br->count - 1) - level_old;
 754         level = br->levels[level_old];
 755
 756 set_level:
 757         result = acpi_video_device_lcd_set_level(device, level);
 758         if (result)
 759                 goto out_free_levels;
 760
 761         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 762                           "found %d brightness levels\n", count - 2));
 763         kfree(obj);
 764         return result;
 765
 766 out_free_levels:
 767         kfree(br->levels);
 768 out_free:
 769         kfree(br);
 770 out:
 771         device->brightness = NULL;
 772         kfree(obj);
 773         return result;
 774 }
 775
 776 /*
 777  *  Arg:
 778  *      device  : video output device (LCD, CRT, ..)
 779  *
 780  *  Return Value:
 781  *      None
 782  *
 783  *  Find out all required AML methods defined under the output
 784  *  device.
 785  */
 786
 787 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 788 {
 789         acpi_handle h_dummy1;
 790
 791         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 792                 device->cap._ADR = 1;
 793         }
 794         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 795                 device->cap._BCL = 1;
 796         }
 797         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 798                 device->cap._BCM = 1;
 799         }
 800         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 801                 device->cap._BQC = 1;
 802         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 803                                 &h_dummy1))) {
 804                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 805                 device->cap._BCQ = 1;
 806         }
 807
 808         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 809                 device->cap._DDC = 1;
 810         }
 811
 812         if (acpi_video_backlight_support()) {
 813                 struct backlight_properties props;
 814                 struct pci_dev *pdev;
 815                 acpi_handle acpi_parent;
 816                 struct device *parent = NULL;
 817                 int result;
 818                 static int count = 0;
 819                 char *name;
 820
 821                 result = acpi_video_init_brightness(device);
 822                 if (result)
 823                         return;
 824                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 825                 if (!name)
 826                         return;
 827                 count++;
 828
 829                 acpi_get_parent(device->dev->handle, &acpi_parent);
 830
 831                 pdev = acpi_get_pci_dev(acpi_parent);
 832                 if (pdev) {
 833                         parent = &pdev->dev;
 834                         pci_dev_put(pdev);
 835                 }
 836
 837                 memset(&props, 0, sizeof(struct backlight_properties));
 838                 props.type = BACKLIGHT_FIRMWARE;
 839                 props.max_brightness = device->brightness->count - 3;
 840                 device->backlight = backlight_device_register(name,
 841                                                               parent,
 842                                                               device,
 843                                                               &acpi_backlight_ops,
 844                                                               &props);
 845                 kfree(name);
 846                 if (IS_ERR(device->backlight))
 847                         return;
 848
 849                 /*
 850                  * Save current brightness level in case we have to restore it
 851                  * before acpi_video_device_lcd_set_level() is called next time.
 852                  */
 853                 device->backlight->props.brightness =
 854                                 acpi_video_get_brightness(device->backlight);
 855
 856                 device->cooling_dev = thermal_cooling_device_register("LCD",
 857                                         device->dev, &video_cooling_ops);
 858                 if (IS_ERR(device->cooling_dev)) {
 859                         /*
 860                          * Set cooling_dev to NULL so we don't crash trying to
 861                          * free it.
 862                          * Also, why the hell we are returning early and
 863                          * not attempt to register video output if cooling
 864                          * device registration failed?
 865                          * -- dtor
 866                          */
 867                         device->cooling_dev = NULL;
 868                         return;
 869                 }
 870
 871                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 872                          device->cooling_dev->id);
 873                 result = sysfs_create_link(&device->dev->dev.kobj,
 874                                 &device->cooling_dev->device.kobj,
 875                                 "thermal_cooling");
 876                 if (result)
 877                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 878                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 879                                 &device->dev->dev.kobj, "device");
 880                 if (result)
 881                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 882
 883         }
 884 }
 885
 886 /*
 887  *  Arg:
 888  *      device  : video output device (VGA)
 889  *
 890  *  Return Value:
 891  *      None
 892  *
 893  *  Find out all required AML methods defined under the video bus device.
 894  */
 895
 896 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 897 {
 898         acpi_handle h_dummy1;
 899
 900         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 901                 video->cap._DOS = 1;
 902         }
 903         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 904                 video->cap._DOD = 1;
 905         }
 906         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 907                 video->cap._ROM = 1;
 908         }
 909         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 910                 video->cap._GPD = 1;
 911         }
 912         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 913                 video->cap._SPD = 1;
 914         }
 915         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 916                 video->cap._VPO = 1;
 917         }
 918 }
 919
 920 /*
 921  * Check whether the video bus device has required AML method to
 922  * support the desired features
 923  */
 924
 925 static int acpi_video_bus_check(struct acpi_video_bus *video)
 926 {
 927         acpi_status status = -ENOENT;
 928         struct pci_dev *dev;
 929
 930         if (!video)
 931                 return -EINVAL;
 932
 933         dev = acpi_get_pci_dev(video->device->handle);
 934         if (!dev)
 935                 return -ENODEV;
 936         pci_dev_put(dev);
 937
 938         /* Since there is no HID, CID and so on for VGA driver, we have
 939          * to check well known required nodes.
 940          */
 941
 942         /* Does this device support video switching? */
 943         if (video->cap._DOS || video->cap._DOD) {
 944                 if (!video->cap._DOS) {
 945                         printk(KERN_WARNING FW_BUG
 946                                 "ACPI(%s) defines _DOD but not _DOS\n",
 947                                 acpi_device_bid(video->device));
 948                 }
 949                 video->flags.multihead = 1;
 950                 status = 0;
 951         }
 952
 953         /* Does this device support retrieving a video ROM? */
 954         if (video->cap._ROM) {
 955                 video->flags.rom = 1;
 956                 status = 0;
 957         }
 958
 959         /* Does this device support configuring which video device to POST? */
 960         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 961                 video->flags.post = 1;
 962                 status = 0;
 963         }
 964
 965         return status;
 966 }
 967
 968 /* --------------------------------------------------------------------------
 969                                  Driver Interface
 970    -------------------------------------------------------------------------- */
 971
 972 /* device interface */
 973 static struct acpi_video_device_attrib*
 974 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 975 {
 976         struct acpi_video_enumerated_device *ids;
 977         int i;
 978
 979         for (i = 0; i < video->attached_count; i++) {
 980                 ids = &video->attached_array[i];
 981                 if ((ids->value.int_val & 0xffff) == device_id)
 982                         return &ids->value.attrib;
 983         }
 984
 985         return NULL;
 986 }
 987
 988 static int
 989 acpi_video_get_device_type(struct acpi_video_bus *video,
 990                            unsigned long device_id)
 991 {
 992         struct acpi_video_enumerated_device *ids;
 993         int i;
 994
 995         for (i = 0; i < video->attached_count; i++) {
 996                 ids = &video->attached_array[i];
 997                 if ((ids->value.int_val & 0xffff) == device_id)
 998                         return ids->value.int_val;
 999         }
1000
1001         return 0;
1002 }
1003
1004 static int
1005 acpi_video_bus_get_one_device(struct acpi_device *device,
1006                               struct acpi_video_bus *video)
1007 {
1008         unsigned long long device_id;
1009         int status, device_type;
1010         struct acpi_video_device *data;
1011         struct acpi_video_device_attrib* attribute;
1012
1013         if (!device || !video)
1014                 return -EINVAL;
1015
1016         status =
1017             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1018         if (ACPI_SUCCESS(status)) {
1019
1020                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1021                 if (!data)
1022                         return -ENOMEM;
1023
1024                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1025                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1026                 device->driver_data = data;
1027
1028                 data->device_id = device_id;
1029                 data->video = video;
1030                 data->dev = device;
1031
1032                 attribute = acpi_video_get_device_attr(video, device_id);
1033
1034                 if((attribute != NULL) && attribute->device_id_scheme) {
1035                         switch (attribute->display_type) {
1036                         case ACPI_VIDEO_DISPLAY_CRT:
1037                                 data->flags.crt = 1;
1038                                 break;
1039                         case ACPI_VIDEO_DISPLAY_TV:
1040                                 data->flags.tvout = 1;
1041                                 break;
1042                         case ACPI_VIDEO_DISPLAY_DVI:
1043                                 data->flags.dvi = 1;
1044                                 break;
1045                         case ACPI_VIDEO_DISPLAY_LCD:
1046                                 data->flags.lcd = 1;
1047                                 break;
1048                         default:
1049                                 data->flags.unknown = 1;
1050                                 break;
1051                         }
1052                         if(attribute->bios_can_detect)
1053                                 data->flags.bios = 1;
1054                 } else {
1055                         /* Check for legacy IDs */
1056                         device_type = acpi_video_get_device_type(video,
1057                                                                  device_id);
1058                         /* Ignore bits 16 and 18-20 */
1059                         switch (device_type & 0xffe2ffff) {
1060                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1061                                 data->flags.crt = 1;
1062                                 break;
1063                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1064                                 data->flags.lcd = 1;
1065                                 break;
1066                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1067                                 data->flags.tvout = 1;
1068                                 break;
1069                         default:
1070                                 data->flags.unknown = 1;
1071                         }
1072                 }
1073
1074                 acpi_video_device_bind(video, data);
1075                 acpi_video_device_find_cap(data);
1076
1077                 status = acpi_install_notify_handler(device->handle,
1078                                                      ACPI_DEVICE_NOTIFY,
1079                                                      acpi_video_device_notify,
1080                                                      data);
1081                 if (ACPI_FAILURE(status)) {
1082                         printk(KERN_ERR PREFIX
1083                                           "Error installing notify handler\n");
1084                         if(data->brightness)
1085                                 kfree(data->brightness->levels);
1086                         kfree(data->brightness);
1087                         kfree(data);
1088                         return -ENODEV;
1089                 }
1090
1091                 mutex_lock(&video->device_list_lock);
1092                 list_add_tail(&data->entry, &video->video_device_list);
1093                 mutex_unlock(&video->device_list_lock);
1094
1095                 return 0;
1096         }
1097
1098         return -ENOENT;
1099 }
1100
1101 /*
1102  *  Arg:
1103  *      video   : video bus device
1104  *
1105  *  Return:
1106  *      none
1107  *
1108  *  Enumerate the video device list of the video bus,
1109  *  bind the ids with the corresponding video devices
1110  *  under the video bus.
1111  */
1112
1113 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1114 {
1115         struct acpi_video_device *dev;
1116
1117         mutex_lock(&video->device_list_lock);
1118
1119         list_for_each_entry(dev, &video->video_device_list, entry)
1120                 acpi_video_device_bind(video, dev);
1121
1122         mutex_unlock(&video->device_list_lock);
1123 }
1124
1125 /*
1126  *  Arg:
1127  *      video   : video bus device
1128  *      device  : video output device under the video
1129  *              bus
1130  *
1131  *  Return:
1132  *      none
1133  *
1134  *  Bind the ids with the corresponding video devices
1135  *  under the video bus.
1136  */
1137
1138 static void
1139 acpi_video_device_bind(struct acpi_video_bus *video,
1140                        struct acpi_video_device *device)
1141 {
1142         struct acpi_video_enumerated_device *ids;
1143         int i;
1144
1145         for (i = 0; i < video->attached_count; i++) {
1146                 ids = &video->attached_array[i];
1147                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1148                         ids->bind_info = device;
1149                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1150                 }
1151         }
1152 }
1153
1154 /*
1155  *  Arg:
1156  *      video   : video bus device
1157  *
1158  *  Return:
1159  *      < 0     : error
1160  *
1161  *  Call _DOD to enumerate all devices attached to display adapter
1162  *
1163  */
1164
1165 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1166 {
1167         int status;
1168         int count;
1169         int i;
1170         struct acpi_video_enumerated_device *active_list;
1171         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1172         union acpi_object *dod = NULL;
1173         union acpi_object *obj;
1174
1175         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1176         if (!ACPI_SUCCESS(status)) {
1177                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1178                 return status;
1179         }
1180
1181         dod = buffer.pointer;
1182         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1183                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1184                 status = -EFAULT;
1185                 goto out;
1186         }
1187
1188         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1189                           dod->package.count));
1190
1191         active_list = kcalloc(1 + dod->package.count,
1192                               sizeof(struct acpi_video_enumerated_device),
1193                               GFP_KERNEL);
1194         if (!active_list) {
1195                 status = -ENOMEM;
1196                 goto out;
1197         }
1198
1199         count = 0;
1200         for (i = 0; i < dod->package.count; i++) {
1201                 obj = &dod->package.elements[i];
1202
1203                 if (obj->type != ACPI_TYPE_INTEGER) {
1204                         printk(KERN_ERR PREFIX
1205                                 "Invalid _DOD data in element %d\n", i);
1206                         continue;
1207                 }
1208
1209                 active_list[count].value.int_val = obj->integer.value;
1210                 active_list[count].bind_info = NULL;
1211                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1212                                   (int)obj->integer.value));
1213                 count++;
1214         }
1215
1216         kfree(video->attached_array);
1217
1218         video->attached_array = active_list;
1219         video->attached_count = count;
1220
1221  out:
1222         kfree(buffer.pointer);
1223         return status;
1224 }
1225
1226 static int
1227 acpi_video_get_next_level(struct acpi_video_device *device,
1228                           u32 level_current, u32 event)
1229 {
1230         int min, max, min_above, max_below, i, l, delta = 255;
1231         max = max_below = 0;
1232         min = min_above = 255;
1233         /* Find closest level to level_current */
1234         for (i = 2; i < device->brightness->count; i++) {
1235                 l = device->brightness->levels[i];
1236                 if (abs(l - level_current) < abs(delta)) {
1237                         delta = l - level_current;
1238                         if (!delta)
1239                                 break;
1240                 }
1241         }
1242         /* Ajust level_current to closest available level */
1243         level_current += delta;
1244         for (i = 2; i < device->brightness->count; i++) {
1245                 l = device->brightness->levels[i];
1246                 if (l < min)
1247                         min = l;
1248                 if (l > max)
1249                         max = l;
1250                 if (l < min_above && l > level_current)
1251                         min_above = l;
1252                 if (l > max_below && l < level_current)
1253                         max_below = l;
1254         }
1255
1256         switch (event) {
1257         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1258                 return (level_current < max) ? min_above : min;
1259         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1260                 return (level_current < max) ? min_above : max;
1261         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1262                 return (level_current > min) ? max_below : min;
1263         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1264         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1265                 return 0;
1266         default:
1267                 return level_current;
1268         }
1269 }
1270
1271 static int
1272 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1273 {
1274         unsigned long long level_current, level_next;
1275         int result = -EINVAL;
1276
1277         /* no warning message if acpi_backlight=vendor is used */
1278         if (!acpi_video_backlight_support())
1279                 return 0;
1280
1281         if (!device->brightness)
1282                 goto out;
1283
1284         result = acpi_video_device_lcd_get_level_current(device,
1285                                                          &level_current, 0);
1286         if (result)
1287                 goto out;
1288
1289         level_next = acpi_video_get_next_level(device, level_current, event);
1290
1291         result = acpi_video_device_lcd_set_level(device, level_next);
1292
1293         if (!result)
1294                 backlight_force_update(device->backlight,
1295                                        BACKLIGHT_UPDATE_HOTKEY);
1296
1297 out:
1298         if (result)
1299                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1300
1301         return result;
1302 }
1303
1304 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1305                         void **edid)
1306 {
1307         struct acpi_video_bus *video;
1308         struct acpi_video_device *video_device;
1309         union acpi_object *buffer = NULL;
1310         acpi_status status;
1311         int i, length;
1312
1313         if (!device || !acpi_driver_data(device))
1314                 return -EINVAL;
1315
1316         video = acpi_driver_data(device);
1317
1318         for (i = 0; i < video->attached_count; i++) {
1319                 video_device = video->attached_array[i].bind_info;
1320                 length = 256;
1321
1322                 if (!video_device)
1323                         continue;
1324
1325                 if (!video_device->cap._DDC)
1326                         continue;
1327
1328                 if (type) {
1329                         switch (type) {
1330                         case ACPI_VIDEO_DISPLAY_CRT:
1331                                 if (!video_device->flags.crt)
1332                                         continue;
1333                                 break;
1334                         case ACPI_VIDEO_DISPLAY_TV:
1335                                 if (!video_device->flags.tvout)
1336                                         continue;
1337                                 break;
1338                         case ACPI_VIDEO_DISPLAY_DVI:
1339                                 if (!video_device->flags.dvi)
1340                                         continue;
1341                                 break;
1342                         case ACPI_VIDEO_DISPLAY_LCD:
1343                                 if (!video_device->flags.lcd)
1344                                         continue;
1345                                 break;
1346                         }
1347                 } else if (video_device->device_id != device_id) {
1348                         continue;
1349                 }
1350
1351                 status = acpi_video_device_EDID(video_device, &buffer, length);
1352
1353                 if (ACPI_FAILURE(status) || !buffer ||
1354                     buffer->type != ACPI_TYPE_BUFFER) {
1355                         length = 128;
1356                         status = acpi_video_device_EDID(video_device, &buffer,
1357                                                         length);
1358                         if (ACPI_FAILURE(status) || !buffer ||
1359                             buffer->type != ACPI_TYPE_BUFFER) {
1360                                 continue;
1361                         }
1362                 }
1363
1364                 *edid = buffer->buffer.pointer;
1365                 return length;
1366         }
1367
1368         return -ENODEV;
1369 }
1370 EXPORT_SYMBOL(acpi_video_get_edid);
1371
1372 static int
1373 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1374                            struct acpi_device *device)
1375 {
1376         int status = 0;
1377         struct acpi_device *dev;
1378
1379         acpi_video_device_enumerate(video);
1380
1381         list_for_each_entry(dev, &device->children, node) {
1382
1383                 status = acpi_video_bus_get_one_device(dev, video);
1384                 if (ACPI_FAILURE(status)) {
1385                         printk(KERN_WARNING PREFIX
1386                                         "Can't attach device\n");
1387                         continue;
1388                 }
1389         }
1390         return status;
1391 }
1392
1393 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1394 {
1395         acpi_status status;
1396
1397         if (!device || !device->video)
1398                 return -ENOENT;
1399
1400         status = acpi_remove_notify_handler(device->dev->handle,
1401                                             ACPI_DEVICE_NOTIFY,
1402                                             acpi_video_device_notify);
1403         if (ACPI_FAILURE(status)) {
1404                 printk(KERN_WARNING PREFIX
1405                        "Can't remove video notify handler\n");
1406         }
1407         if (device->backlight) {
1408                 backlight_device_unregister(device->backlight);
1409                 device->backlight = NULL;
1410         }
1411         if (device->cooling_dev) {
1412                 sysfs_remove_link(&device->dev->dev.kobj,
1413                                   "thermal_cooling");
1414                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1415                                   "device");
1416                 thermal_cooling_device_unregister(device->cooling_dev);
1417                 device->cooling_dev = NULL;
1418         }
1419
1420         return 0;
1421 }
1422
1423 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1424 {
1425         int status;
1426         struct acpi_video_device *dev, *next;
1427
1428         mutex_lock(&video->device_list_lock);
1429
1430         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1431
1432                 status = acpi_video_bus_put_one_device(dev);
1433                 if (ACPI_FAILURE(status))
1434                         printk(KERN_WARNING PREFIX
1435                                "hhuuhhuu bug in acpi video driver.\n");
1436
1437                 if (dev->brightness) {
1438                         kfree(dev->brightness->levels);
1439                         kfree(dev->brightness);
1440                 }
1441                 list_del(&dev->entry);
1442                 kfree(dev);
1443         }
1444
1445         mutex_unlock(&video->device_list_lock);
1446
1447         return 0;
1448 }
1449
1450 /* acpi_video interface */
1451
1452 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1453 {
1454         return acpi_video_bus_DOS(video, 0, 0);
1455 }
1456
1457 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1458 {
1459         return acpi_video_bus_DOS(video, 0, 1);
1460 }
1461
1462 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1463 {
1464         struct acpi_video_bus *video = acpi_driver_data(device);
1465         struct input_dev *input;
1466         int keycode = 0;
1467
1468         if (!video)
1469                 return;
1470
1471         input = video->input;
1472
1473         switch (event) {
1474         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1475                                          * most likely via hotkey. */
1476                 acpi_bus_generate_proc_event(device, event, 0);
1477                 if (!acpi_notifier_call_chain(device, event, 0))
1478                         keycode = KEY_SWITCHVIDEOMODE;
1479                 break;
1480
1481         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1482                                          * connector. */
1483                 acpi_video_device_enumerate(video);
1484                 acpi_video_device_rebind(video);
1485                 acpi_bus_generate_proc_event(device, event, 0);
1486                 keycode = KEY_SWITCHVIDEOMODE;
1487                 break;
1488
1489         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1490                 acpi_bus_generate_proc_event(device, event, 0);
1491                 keycode = KEY_SWITCHVIDEOMODE;
1492                 break;
1493         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1494                 acpi_bus_generate_proc_event(device, event, 0);
1495                 keycode = KEY_VIDEO_NEXT;
1496                 break;
1497         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1498                 acpi_bus_generate_proc_event(device, event, 0);
1499                 keycode = KEY_VIDEO_PREV;
1500                 break;
1501
1502         default:
1503                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1504                                   "Unsupported event [0x%x]\n", event));
1505                 break;
1506         }
1507
1508         if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1509                 acpi_notifier_call_chain(device, event, 0);
1510
1511         if (keycode) {
1512                 input_report_key(input, keycode, 1);
1513                 input_sync(input);
1514                 input_report_key(input, keycode, 0);
1515                 input_sync(input);
1516         }
1517
1518         return;
1519 }
1520
1521 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1522 {
1523         struct acpi_video_device *video_device = data;
1524         struct acpi_device *device = NULL;
1525         struct acpi_video_bus *bus;
1526         struct input_dev *input;
1527         int keycode = 0;
1528
1529         if (!video_device)
1530                 return;
1531
1532         device = video_device->dev;
1533         bus = video_device->video;
1534         input = bus->input;
1535
1536         switch (event) {
1537         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1538                 if (brightness_switch_enabled)
1539                         acpi_video_switch_brightness(video_device, event);
1540                 acpi_bus_generate_proc_event(device, event, 0);
1541                 keycode = KEY_BRIGHTNESS_CYCLE;
1542                 break;
1543         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1544                 if (brightness_switch_enabled)
1545                         acpi_video_switch_brightness(video_device, event);
1546                 acpi_bus_generate_proc_event(device, event, 0);
1547                 keycode = KEY_BRIGHTNESSUP;
1548                 break;
1549         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1550                 if (brightness_switch_enabled)
1551                         acpi_video_switch_brightness(video_device, event);
1552                 acpi_bus_generate_proc_event(device, event, 0);
1553                 keycode = KEY_BRIGHTNESSDOWN;
1554                 break;
1555         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1556                 if (brightness_switch_enabled)
1557                         acpi_video_switch_brightness(video_device, event);
1558                 acpi_bus_generate_proc_event(device, event, 0);
1559                 keycode = KEY_BRIGHTNESS_ZERO;
1560                 break;
1561         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1562                 if (brightness_switch_enabled)
1563                         acpi_video_switch_brightness(video_device, event);
1564                 acpi_bus_generate_proc_event(device, event, 0);
1565                 keycode = KEY_DISPLAY_OFF;
1566                 break;
1567         default:
1568                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1569                                   "Unsupported event [0x%x]\n", event));
1570                 break;
1571         }
1572
1573         acpi_notifier_call_chain(device, event, 0);
1574
1575         if (keycode) {
1576                 input_report_key(input, keycode, 1);
1577                 input_sync(input);
1578                 input_report_key(input, keycode, 0);
1579                 input_sync(input);
1580         }
1581
1582         return;
1583 }
1584
1585 static int acpi_video_resume(struct notifier_block *nb,
1586                                 unsigned long val, void *ign)
1587 {
1588         struct acpi_video_bus *video;
1589         struct acpi_video_device *video_device;
1590         int i;
1591
1592         switch (val) {
1593         case PM_HIBERNATION_PREPARE:
1594         case PM_SUSPEND_PREPARE:
1595         case PM_RESTORE_PREPARE:
1596                 return NOTIFY_DONE;
1597         }
1598
1599         video = container_of(nb, struct acpi_video_bus, pm_nb);
1600
1601         dev_info(&video->device->dev, "Restoring backlight state\n");
1602
1603         for (i = 0; i < video->attached_count; i++) {
1604                 video_device = video->attached_array[i].bind_info;
1605                 if (video_device && video_device->backlight)
1606                         acpi_video_set_brightness(video_device->backlight);
1607         }
1608
1609         return NOTIFY_OK;
1610 }
1611
1612 static acpi_status
1613 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1614                         void **return_value)
1615 {
1616         struct acpi_device *device = context;
1617         struct acpi_device *sibling;
1618         int result;
1619
1620         if (handle == device->handle)
1621                 return AE_CTRL_TERMINATE;
1622
1623         result = acpi_bus_get_device(handle, &sibling);
1624         if (result)
1625                 return AE_OK;
1626
1627         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1628                         return AE_ALREADY_EXISTS;
1629
1630         return AE_OK;
1631 }
1632
1633 static int instance;
1634
1635 static int acpi_video_bus_add(struct acpi_device *device)
1636 {
1637         struct acpi_video_bus *video;
1638         struct input_dev *input;
1639         int error;
1640         acpi_status status;
1641
1642         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1643                                 device->parent->handle, 1,
1644                                 acpi_video_bus_match, NULL,
1645                                 device, NULL);
1646         if (status == AE_ALREADY_EXISTS) {
1647                 printk(KERN_WARNING FW_BUG
1648                         "Duplicate ACPI video bus devices for the"
1649                         " same VGA controller, please try module "
1650                         "parameter \"video.allow_duplicates=1\""
1651                         "if the current driver doesn't work.\n");
1652                 if (!allow_duplicates)
1653                         return -ENODEV;
1654         }
1655
1656         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1657         if (!video)
1658                 return -ENOMEM;
1659
1660         /* a hack to fix the duplicate name "VID" problem on T61 */
1661         if (!strcmp(device->pnp.bus_id, "VID")) {
1662                 if (instance)
1663                         device->pnp.bus_id[3] = '0' + instance;
1664                 instance ++;
1665         }
1666         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1667         if (!strcmp(device->pnp.bus_id, "VGA")) {
1668                 if (instance)
1669                         device->pnp.bus_id[3] = '0' + instance;
1670                 instance++;
1671         }
1672
1673         video->device = device;
1674         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1675         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1676         device->driver_data = video;
1677
1678         acpi_video_bus_find_cap(video);
1679         error = acpi_video_bus_check(video);
1680         if (error)
1681                 goto err_free_video;
1682
1683         mutex_init(&video->device_list_lock);
1684         INIT_LIST_HEAD(&video->video_device_list);
1685
1686         acpi_video_bus_get_devices(video, device);
1687         acpi_video_bus_start_devices(video);
1688
1689         video->input = input = input_allocate_device();
1690         if (!input) {
1691                 error = -ENOMEM;
1692                 goto err_stop_video;
1693         }
1694
1695         snprintf(video->phys, sizeof(video->phys),
1696                 "%s/video/input0", acpi_device_hid(video->device));
1697
1698         input->name = acpi_device_name(video->device);
1699         input->phys = video->phys;
1700         input->id.bustype = BUS_HOST;
1701         input->id.product = 0x06;
1702         input->dev.parent = &device->dev;
1703         input->evbit[0] = BIT(EV_KEY);
1704         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1705         set_bit(KEY_VIDEO_NEXT, input->keybit);
1706         set_bit(KEY_VIDEO_PREV, input->keybit);
1707         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1708         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1709         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1710         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1711         set_bit(KEY_DISPLAY_OFF, input->keybit);
1712
1713         error = input_register_device(input);
1714         if (error)
1715                 goto err_free_input_dev;
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         register_pm_notifier(&video->pm_nb);
1726
1727         return 0;
1728
1729  err_free_input_dev:
1730         input_free_device(input);
1731  err_stop_video:
1732         acpi_video_bus_stop_devices(video);
1733         acpi_video_bus_put_devices(video);
1734         kfree(video->attached_array);
1735  err_free_video:
1736         kfree(video);
1737         device->driver_data = NULL;
1738
1739         return error;
1740 }
1741
1742 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1743 {
1744         struct acpi_video_bus *video = NULL;
1745
1746
1747         if (!device || !acpi_driver_data(device))
1748                 return -EINVAL;
1749
1750         video = acpi_driver_data(device);
1751
1752         unregister_pm_notifier(&video->pm_nb);
1753
1754         acpi_video_bus_stop_devices(video);
1755         acpi_video_bus_put_devices(video);
1756
1757         input_unregister_device(video->input);
1758         kfree(video->attached_array);
1759         kfree(video);
1760
1761         return 0;
1762 }
1763
1764 static int __init intel_opregion_present(void)
1765 {
1766 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1767         struct pci_dev *dev = NULL;
1768         u32 address;
1769
1770         for_each_pci_dev(dev) {
1771                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1772                         continue;
1773                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1774                         continue;
1775                 pci_read_config_dword(dev, 0xfc, &address);
1776                 if (!address)
1777                         continue;
1778                 return 1;
1779         }
1780 #endif
1781         return 0;
1782 }
1783
1784 int acpi_video_register(void)
1785 {
1786         int result = 0;
1787         if (register_count) {
1788                 /*
1789                  * if the function of acpi_video_register is already called,
1790                  * don't register the acpi_vide_bus again and return no error.
1791                  */
1792                 return 0;
1793         }
1794
1795         result = acpi_bus_register_driver(&acpi_video_bus);
1796         if (result < 0)
1797                 return -ENODEV;
1798
1799         /*
1800          * When the acpi_video_bus is loaded successfully, increase
1801          * the counter reference.
1802          */
1803         register_count = 1;
1804
1805         return 0;
1806 }
1807 EXPORT_SYMBOL(acpi_video_register);
1808
1809 void acpi_video_unregister(void)
1810 {
1811         if (!register_count) {
1812                 /*
1813                  * If the acpi video bus is already unloaded, don't
1814                  * unload it again and return directly.
1815                  */
1816                 return;
1817         }
1818         acpi_bus_unregister_driver(&acpi_video_bus);
1819
1820         register_count = 0;
1821
1822         return;
1823 }
1824 EXPORT_SYMBOL(acpi_video_unregister);
1825
1826 /*
1827  * This is kind of nasty. Hardware using Intel chipsets may require
1828  * the video opregion code to be run first in order to initialise
1829  * state before any ACPI video calls are made. To handle this we defer
1830  * registration of the video class until the opregion code has run.
1831  */
1832
1833 static int __init acpi_video_init(void)
1834 {
1835         dmi_check_system(video_dmi_table);
1836
1837         if (intel_opregion_present())
1838                 return 0;
1839
1840         return acpi_video_register();
1841 }
1842
1843 static void __exit acpi_video_exit(void)
1844 {
1845         acpi_video_unregister();
1846
1847         return;
1848 }
1849
1850 module_init(acpi_video_init);
1851 module_exit(acpi_video_exit);