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 };
 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  *              -1      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         u64 status = 0;
 580         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 581         struct acpi_object_list args = { 1, &arg0 };
 582
 583
 584         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
 585                 status = -1;
 586                 goto Failed;
 587         }
 588         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 589         video->dos_setting = arg0.integer.value;
 590         acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
 591
 592       Failed:
 593         return status;
 594 }
 595
 596 /*
 597  * Simple comparison function used to sort backlight levels.
 598  */
 599
 600 static int
 601 acpi_video_cmp_level(const void *a, const void *b)
 602 {
 603         return *(int *)a - *(int *)b;
 604 }
 605
 606 /*
 607  *  Arg:
 608  *      device  : video output device (LCD, CRT, ..)
 609  *
 610  *  Return Value:
 611  *      Maximum brightness level
 612  *
 613  *  Allocate and initialize device->brightness.
 614  */
 615
 616 static int
 617 acpi_video_init_brightness(struct acpi_video_device *device)
 618 {
 619         union acpi_object *obj = NULL;
 620         int i, max_level = 0, count = 0, level_ac_battery = 0;
 621         unsigned long long level, level_old;
 622         union acpi_object *o;
 623         struct acpi_video_device_brightness *br = NULL;
 624         int result = -EINVAL;
 625
 626         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 627                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 628                                                 "LCD brightness level\n"));
 629                 goto out;
 630         }
 631
 632         if (obj->package.count < 2)
 633                 goto out;
 634
 635         br = kzalloc(sizeof(*br), GFP_KERNEL);
 636         if (!br) {
 637                 printk(KERN_ERR "can't allocate memory\n");
 638                 result = -ENOMEM;
 639                 goto out;
 640         }
 641
 642         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 643                                 GFP_KERNEL);
 644         if (!br->levels) {
 645                 result = -ENOMEM;
 646                 goto out_free;
 647         }
 648
 649         for (i = 0; i < obj->package.count; i++) {
 650                 o = (union acpi_object *)&obj->package.elements[i];
 651                 if (o->type != ACPI_TYPE_INTEGER) {
 652                         printk(KERN_ERR PREFIX "Invalid data\n");
 653                         continue;
 654                 }
 655                 br->levels[count] = (u32) o->integer.value;
 656
 657                 if (br->levels[count] > max_level)
 658                         max_level = br->levels[count];
 659                 count++;
 660         }
 661
 662         /*
 663          * some buggy BIOS don't export the levels
 664          * when machine is on AC/Battery in _BCL package.
 665          * In this case, the first two elements in _BCL packages
 666          * are also supported brightness levels that OS should take care of.
 667          */
 668         for (i = 2; i < count; i++) {
 669                 if (br->levels[i] == br->levels[0])
 670                         level_ac_battery++;
 671                 if (br->levels[i] == br->levels[1])
 672                         level_ac_battery++;
 673         }
 674
 675         if (level_ac_battery < 2) {
 676                 level_ac_battery = 2 - level_ac_battery;
 677                 br->flags._BCL_no_ac_battery_levels = 1;
 678                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 679                         br->levels[i] = br->levels[i - level_ac_battery];
 680                 count += level_ac_battery;
 681         } else if (level_ac_battery > 2)
 682                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 683
 684         /* Check if the _BCL package is in a reversed order */
 685         if (max_level == br->levels[2]) {
 686                 br->flags._BCL_reversed = 1;
 687                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 688                         acpi_video_cmp_level, NULL);
 689         } else if (max_level != br->levels[count - 1])
 690                 ACPI_ERROR((AE_INFO,
 691                             "Found unordered _BCL package\n"));
 692
 693         br->count = count;
 694         device->brightness = br;
 695
 696         /* Check the input/output of _BQC/_BCL/_BCM */
 697         if ((max_level < 100) && (max_level <= (count - 2)))
 698                 br->flags._BCL_use_index = 1;
 699
 700         /*
 701          * _BCM is always consistent with _BCL,
 702          * at least for all the laptops we have ever seen.
 703          */
 704         br->flags._BCM_use_index = br->flags._BCL_use_index;
 705
 706         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 707         br->curr = level = max_level;
 708
 709         if (!device->cap._BQC)
 710                 goto set_level;
 711
 712         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 713         if (result)
 714                 goto out_free_levels;
 715
 716         /*
 717          * Set the level to maximum and check if _BQC uses indexed value
 718          */
 719         result = acpi_video_device_lcd_set_level(device, max_level);
 720         if (result)
 721                 goto out_free_levels;
 722
 723         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 724         if (result)
 725                 goto out_free_levels;
 726
 727         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 728
 729         if (!br->flags._BQC_use_index) {
 730                 /*
 731                  * Set the backlight to the initial state.
 732                  * On some buggy laptops, _BQC returns an uninitialized value
 733                  * when invoked for the first time, i.e. level_old is invalid.
 734                  * set the backlight to max_level in this case
 735                  */
 736                 if (use_bios_initial_backlight) {
 737                         for (i = 2; i < br->count; i++)
 738                                 if (level_old == br->levels[i])
 739                                         level = level_old;
 740                 }
 741                 goto set_level;
 742         }
 743
 744         if (br->flags._BCL_reversed)
 745                 level_old = (br->count - 1) - level_old;
 746         level = br->levels[level_old];
 747
 748 set_level:
 749         result = acpi_video_device_lcd_set_level(device, level);
 750         if (result)
 751                 goto out_free_levels;
 752
 753         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 754                           "found %d brightness levels\n", count - 2));
 755         kfree(obj);
 756         return result;
 757
 758 out_free_levels:
 759         kfree(br->levels);
 760 out_free:
 761         kfree(br);
 762 out:
 763         device->brightness = NULL;
 764         kfree(obj);
 765         return result;
 766 }
 767
 768 /*
 769  *  Arg:
 770  *      device  : video output device (LCD, CRT, ..)
 771  *
 772  *  Return Value:
 773  *      None
 774  *
 775  *  Find out all required AML methods defined under the output
 776  *  device.
 777  */
 778
 779 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 780 {
 781         acpi_handle h_dummy1;
 782
 783         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 784                 device->cap._ADR = 1;
 785         }
 786         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 787                 device->cap._BCL = 1;
 788         }
 789         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 790                 device->cap._BCM = 1;
 791         }
 792         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 793                 device->cap._BQC = 1;
 794         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 795                                 &h_dummy1))) {
 796                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 797                 device->cap._BCQ = 1;
 798         }
 799
 800         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 801                 device->cap._DDC = 1;
 802         }
 803
 804         if (acpi_video_backlight_support()) {
 805                 struct backlight_properties props;
 806                 struct pci_dev *pdev;
 807                 acpi_handle acpi_parent;
 808                 struct device *parent = NULL;
 809                 int result;
 810                 static int count = 0;
 811                 char *name;
 812
 813                 result = acpi_video_init_brightness(device);
 814                 if (result)
 815                         return;
 816                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 817                 if (!name)
 818                         return;
 819                 count++;
 820
 821                 acpi_get_parent(device->dev->handle, &acpi_parent);
 822
 823                 pdev = acpi_get_pci_dev(acpi_parent);
 824                 if (pdev) {
 825                         parent = &pdev->dev;
 826                         pci_dev_put(pdev);
 827                 }
 828
 829                 memset(&props, 0, sizeof(struct backlight_properties));
 830                 props.type = BACKLIGHT_FIRMWARE;
 831                 props.max_brightness = device->brightness->count - 3;
 832                 device->backlight = backlight_device_register(name,
 833                                                               parent,
 834                                                               device,
 835                                                               &acpi_backlight_ops,
 836                                                               &props);
 837                 kfree(name);
 838                 if (IS_ERR(device->backlight))
 839                         return;
 840
 841                 /*
 842                  * Save current brightness level in case we have to restore it
 843                  * before acpi_video_device_lcd_set_level() is called next time.
 844                  */
 845                 device->backlight->props.brightness =
 846                                 acpi_video_get_brightness(device->backlight);
 847
 848                 device->cooling_dev = thermal_cooling_device_register("LCD",
 849                                         device->dev, &video_cooling_ops);
 850                 if (IS_ERR(device->cooling_dev)) {
 851                         /*
 852                          * Set cooling_dev to NULL so we don't crash trying to
 853                          * free it.
 854                          * Also, why the hell we are returning early and
 855                          * not attempt to register video output if cooling
 856                          * device registration failed?
 857                          * -- dtor
 858                          */
 859                         device->cooling_dev = NULL;
 860                         return;
 861                 }
 862
 863                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 864                          device->cooling_dev->id);
 865                 result = sysfs_create_link(&device->dev->dev.kobj,
 866                                 &device->cooling_dev->device.kobj,
 867                                 "thermal_cooling");
 868                 if (result)
 869                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 870                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 871                                 &device->dev->dev.kobj, "device");
 872                 if (result)
 873                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 874
 875         }
 876 }
 877
 878 /*
 879  *  Arg:
 880  *      device  : video output device (VGA)
 881  *
 882  *  Return Value:
 883  *      None
 884  *
 885  *  Find out all required AML methods defined under the video bus device.
 886  */
 887
 888 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 889 {
 890         acpi_handle h_dummy1;
 891
 892         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 893                 video->cap._DOS = 1;
 894         }
 895         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 896                 video->cap._DOD = 1;
 897         }
 898         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 899                 video->cap._ROM = 1;
 900         }
 901         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 902                 video->cap._GPD = 1;
 903         }
 904         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 905                 video->cap._SPD = 1;
 906         }
 907         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 908                 video->cap._VPO = 1;
 909         }
 910 }
 911
 912 /*
 913  * Check whether the video bus device has required AML method to
 914  * support the desired features
 915  */
 916
 917 static int acpi_video_bus_check(struct acpi_video_bus *video)
 918 {
 919         acpi_status status = -ENOENT;
 920         struct pci_dev *dev;
 921
 922         if (!video)
 923                 return -EINVAL;
 924
 925         dev = acpi_get_pci_dev(video->device->handle);
 926         if (!dev)
 927                 return -ENODEV;
 928         pci_dev_put(dev);
 929
 930         /* Since there is no HID, CID and so on for VGA driver, we have
 931          * to check well known required nodes.
 932          */
 933
 934         /* Does this device support video switching? */
 935         if (video->cap._DOS || video->cap._DOD) {
 936                 if (!video->cap._DOS) {
 937                         printk(KERN_WARNING FW_BUG
 938                                 "ACPI(%s) defines _DOD but not _DOS\n",
 939                                 acpi_device_bid(video->device));
 940                 }
 941                 video->flags.multihead = 1;
 942                 status = 0;
 943         }
 944
 945         /* Does this device support retrieving a video ROM? */
 946         if (video->cap._ROM) {
 947                 video->flags.rom = 1;
 948                 status = 0;
 949         }
 950
 951         /* Does this device support configuring which video device to POST? */
 952         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 953                 video->flags.post = 1;
 954                 status = 0;
 955         }
 956
 957         return status;
 958 }
 959
 960 /* --------------------------------------------------------------------------
 961                                  Driver Interface
 962    -------------------------------------------------------------------------- */
 963
 964 /* device interface */
 965 static struct acpi_video_device_attrib*
 966 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 967 {
 968         struct acpi_video_enumerated_device *ids;
 969         int i;
 970
 971         for (i = 0; i < video->attached_count; i++) {
 972                 ids = &video->attached_array[i];
 973                 if ((ids->value.int_val & 0xffff) == device_id)
 974                         return &ids->value.attrib;
 975         }
 976
 977         return NULL;
 978 }
 979
 980 static int
 981 acpi_video_get_device_type(struct acpi_video_bus *video,
 982                            unsigned long device_id)
 983 {
 984         struct acpi_video_enumerated_device *ids;
 985         int i;
 986
 987         for (i = 0; i < video->attached_count; i++) {
 988                 ids = &video->attached_array[i];
 989                 if ((ids->value.int_val & 0xffff) == device_id)
 990                         return ids->value.int_val;
 991         }
 992
 993         return 0;
 994 }
 995
 996 static int
 997 acpi_video_bus_get_one_device(struct acpi_device *device,
 998                               struct acpi_video_bus *video)
 999 {
1000         unsigned long long device_id;
1001         int status, device_type;
1002         struct acpi_video_device *data;
1003         struct acpi_video_device_attrib* attribute;
1004
1005         if (!device || !video)
1006                 return -EINVAL;
1007
1008         status =
1009             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1010         if (ACPI_SUCCESS(status)) {
1011
1012                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1013                 if (!data)
1014                         return -ENOMEM;
1015
1016                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1017                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1018                 device->driver_data = data;
1019
1020                 data->device_id = device_id;
1021                 data->video = video;
1022                 data->dev = device;
1023
1024                 attribute = acpi_video_get_device_attr(video, device_id);
1025
1026                 if((attribute != NULL) && attribute->device_id_scheme) {
1027                         switch (attribute->display_type) {
1028                         case ACPI_VIDEO_DISPLAY_CRT:
1029                                 data->flags.crt = 1;
1030                                 break;
1031                         case ACPI_VIDEO_DISPLAY_TV:
1032                                 data->flags.tvout = 1;
1033                                 break;
1034                         case ACPI_VIDEO_DISPLAY_DVI:
1035                                 data->flags.dvi = 1;
1036                                 break;
1037                         case ACPI_VIDEO_DISPLAY_LCD:
1038                                 data->flags.lcd = 1;
1039                                 break;
1040                         default:
1041                                 data->flags.unknown = 1;
1042                                 break;
1043                         }
1044                         if(attribute->bios_can_detect)
1045                                 data->flags.bios = 1;
1046                 } else {
1047                         /* Check for legacy IDs */
1048                         device_type = acpi_video_get_device_type(video,
1049                                                                  device_id);
1050                         /* Ignore bits 16 and 18-20 */
1051                         switch (device_type & 0xffe2ffff) {
1052                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1053                                 data->flags.crt = 1;
1054                                 break;
1055                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1056                                 data->flags.lcd = 1;
1057                                 break;
1058                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1059                                 data->flags.tvout = 1;
1060                                 break;
1061                         default:
1062                                 data->flags.unknown = 1;
1063                         }
1064                 }
1065
1066                 acpi_video_device_bind(video, data);
1067                 acpi_video_device_find_cap(data);
1068
1069                 status = acpi_install_notify_handler(device->handle,
1070                                                      ACPI_DEVICE_NOTIFY,
1071                                                      acpi_video_device_notify,
1072                                                      data);
1073                 if (ACPI_FAILURE(status)) {
1074                         printk(KERN_ERR PREFIX
1075                                           "Error installing notify handler\n");
1076                         if(data->brightness)
1077                                 kfree(data->brightness->levels);
1078                         kfree(data->brightness);
1079                         kfree(data);
1080                         return -ENODEV;
1081                 }
1082
1083                 mutex_lock(&video->device_list_lock);
1084                 list_add_tail(&data->entry, &video->video_device_list);
1085                 mutex_unlock(&video->device_list_lock);
1086
1087                 return 0;
1088         }
1089
1090         return -ENOENT;
1091 }
1092
1093 /*
1094  *  Arg:
1095  *      video   : video bus device
1096  *
1097  *  Return:
1098  *      none
1099  *
1100  *  Enumerate the video device list of the video bus,
1101  *  bind the ids with the corresponding video devices
1102  *  under the video bus.
1103  */
1104
1105 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1106 {
1107         struct acpi_video_device *dev;
1108
1109         mutex_lock(&video->device_list_lock);
1110
1111         list_for_each_entry(dev, &video->video_device_list, entry)
1112                 acpi_video_device_bind(video, dev);
1113
1114         mutex_unlock(&video->device_list_lock);
1115 }
1116
1117 /*
1118  *  Arg:
1119  *      video   : video bus device
1120  *      device  : video output device under the video
1121  *              bus
1122  *
1123  *  Return:
1124  *      none
1125  *
1126  *  Bind the ids with the corresponding video devices
1127  *  under the video bus.
1128  */
1129
1130 static void
1131 acpi_video_device_bind(struct acpi_video_bus *video,
1132                        struct acpi_video_device *device)
1133 {
1134         struct acpi_video_enumerated_device *ids;
1135         int i;
1136
1137         for (i = 0; i < video->attached_count; i++) {
1138                 ids = &video->attached_array[i];
1139                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1140                         ids->bind_info = device;
1141                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1142                 }
1143         }
1144 }
1145
1146 /*
1147  *  Arg:
1148  *      video   : video bus device
1149  *
1150  *  Return:
1151  *      < 0     : error
1152  *
1153  *  Call _DOD to enumerate all devices attached to display adapter
1154  *
1155  */
1156
1157 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1158 {
1159         int status;
1160         int count;
1161         int i;
1162         struct acpi_video_enumerated_device *active_list;
1163         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1164         union acpi_object *dod = NULL;
1165         union acpi_object *obj;
1166
1167         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1168         if (!ACPI_SUCCESS(status)) {
1169                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1170                 return status;
1171         }
1172
1173         dod = buffer.pointer;
1174         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1175                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1176                 status = -EFAULT;
1177                 goto out;
1178         }
1179
1180         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1181                           dod->package.count));
1182
1183         active_list = kcalloc(1 + dod->package.count,
1184                               sizeof(struct acpi_video_enumerated_device),
1185                               GFP_KERNEL);
1186         if (!active_list) {
1187                 status = -ENOMEM;
1188                 goto out;
1189         }
1190
1191         count = 0;
1192         for (i = 0; i < dod->package.count; i++) {
1193                 obj = &dod->package.elements[i];
1194
1195                 if (obj->type != ACPI_TYPE_INTEGER) {
1196                         printk(KERN_ERR PREFIX
1197                                 "Invalid _DOD data in element %d\n", i);
1198                         continue;
1199                 }
1200
1201                 active_list[count].value.int_val = obj->integer.value;
1202                 active_list[count].bind_info = NULL;
1203                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1204                                   (int)obj->integer.value));
1205                 count++;
1206         }
1207
1208         kfree(video->attached_array);
1209
1210         video->attached_array = active_list;
1211         video->attached_count = count;
1212
1213  out:
1214         kfree(buffer.pointer);
1215         return status;
1216 }
1217
1218 static int
1219 acpi_video_get_next_level(struct acpi_video_device *device,
1220                           u32 level_current, u32 event)
1221 {
1222         int min, max, min_above, max_below, i, l, delta = 255;
1223         max = max_below = 0;
1224         min = min_above = 255;
1225         /* Find closest level to level_current */
1226         for (i = 2; i < device->brightness->count; i++) {
1227                 l = device->brightness->levels[i];
1228                 if (abs(l - level_current) < abs(delta)) {
1229                         delta = l - level_current;
1230                         if (!delta)
1231                                 break;
1232                 }
1233         }
1234         /* Ajust level_current to closest available level */
1235         level_current += delta;
1236         for (i = 2; i < device->brightness->count; i++) {
1237                 l = device->brightness->levels[i];
1238                 if (l < min)
1239                         min = l;
1240                 if (l > max)
1241                         max = l;
1242                 if (l < min_above && l > level_current)
1243                         min_above = l;
1244                 if (l > max_below && l < level_current)
1245                         max_below = l;
1246         }
1247
1248         switch (event) {
1249         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1250                 return (level_current < max) ? min_above : min;
1251         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1252                 return (level_current < max) ? min_above : max;
1253         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1254                 return (level_current > min) ? max_below : min;
1255         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1256         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1257                 return 0;
1258         default:
1259                 return level_current;
1260         }
1261 }
1262
1263 static int
1264 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1265 {
1266         unsigned long long level_current, level_next;
1267         int result = -EINVAL;
1268
1269         /* no warning message if acpi_backlight=vendor is used */
1270         if (!acpi_video_backlight_support())
1271                 return 0;
1272
1273         if (!device->brightness)
1274                 goto out;
1275
1276         result = acpi_video_device_lcd_get_level_current(device,
1277                                                          &level_current, 0);
1278         if (result)
1279                 goto out;
1280
1281         level_next = acpi_video_get_next_level(device, level_current, event);
1282
1283         result = acpi_video_device_lcd_set_level(device, level_next);
1284
1285         if (!result)
1286                 backlight_force_update(device->backlight,
1287                                        BACKLIGHT_UPDATE_HOTKEY);
1288
1289 out:
1290         if (result)
1291                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1292
1293         return result;
1294 }
1295
1296 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1297                         void **edid)
1298 {
1299         struct acpi_video_bus *video;
1300         struct acpi_video_device *video_device;
1301         union acpi_object *buffer = NULL;
1302         acpi_status status;
1303         int i, length;
1304
1305         if (!device || !acpi_driver_data(device))
1306                 return -EINVAL;
1307
1308         video = acpi_driver_data(device);
1309
1310         for (i = 0; i < video->attached_count; i++) {
1311                 video_device = video->attached_array[i].bind_info;
1312                 length = 256;
1313
1314                 if (!video_device)
1315                         continue;
1316
1317                 if (!video_device->cap._DDC)
1318                         continue;
1319
1320                 if (type) {
1321                         switch (type) {
1322                         case ACPI_VIDEO_DISPLAY_CRT:
1323                                 if (!video_device->flags.crt)
1324                                         continue;
1325                                 break;
1326                         case ACPI_VIDEO_DISPLAY_TV:
1327                                 if (!video_device->flags.tvout)
1328                                         continue;
1329                                 break;
1330                         case ACPI_VIDEO_DISPLAY_DVI:
1331                                 if (!video_device->flags.dvi)
1332                                         continue;
1333                                 break;
1334                         case ACPI_VIDEO_DISPLAY_LCD:
1335                                 if (!video_device->flags.lcd)
1336                                         continue;
1337                                 break;
1338                         }
1339                 } else if (video_device->device_id != device_id) {
1340                         continue;
1341                 }
1342
1343                 status = acpi_video_device_EDID(video_device, &buffer, length);
1344
1345                 if (ACPI_FAILURE(status) || !buffer ||
1346                     buffer->type != ACPI_TYPE_BUFFER) {
1347                         length = 128;
1348                         status = acpi_video_device_EDID(video_device, &buffer,
1349                                                         length);
1350                         if (ACPI_FAILURE(status) || !buffer ||
1351                             buffer->type != ACPI_TYPE_BUFFER) {
1352                                 continue;
1353                         }
1354                 }
1355
1356                 *edid = buffer->buffer.pointer;
1357                 return length;
1358         }
1359
1360         return -ENODEV;
1361 }
1362 EXPORT_SYMBOL(acpi_video_get_edid);
1363
1364 static int
1365 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1366                            struct acpi_device *device)
1367 {
1368         int status = 0;
1369         struct acpi_device *dev;
1370
1371         acpi_video_device_enumerate(video);
1372
1373         list_for_each_entry(dev, &device->children, node) {
1374
1375                 status = acpi_video_bus_get_one_device(dev, video);
1376                 if (ACPI_FAILURE(status)) {
1377                         printk(KERN_WARNING PREFIX
1378                                         "Can't attach device\n");
1379                         continue;
1380                 }
1381         }
1382         return status;
1383 }
1384
1385 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1386 {
1387         acpi_status status;
1388
1389         if (!device || !device->video)
1390                 return -ENOENT;
1391
1392         status = acpi_remove_notify_handler(device->dev->handle,
1393                                             ACPI_DEVICE_NOTIFY,
1394                                             acpi_video_device_notify);
1395         if (ACPI_FAILURE(status)) {
1396                 printk(KERN_WARNING PREFIX
1397                        "Can't remove video notify handler\n");
1398         }
1399         if (device->backlight) {
1400                 backlight_device_unregister(device->backlight);
1401                 device->backlight = NULL;
1402         }
1403         if (device->cooling_dev) {
1404                 sysfs_remove_link(&device->dev->dev.kobj,
1405                                   "thermal_cooling");
1406                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1407                                   "device");
1408                 thermal_cooling_device_unregister(device->cooling_dev);
1409                 device->cooling_dev = NULL;
1410         }
1411
1412         return 0;
1413 }
1414
1415 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1416 {
1417         int status;
1418         struct acpi_video_device *dev, *next;
1419
1420         mutex_lock(&video->device_list_lock);
1421
1422         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1423
1424                 status = acpi_video_bus_put_one_device(dev);
1425                 if (ACPI_FAILURE(status))
1426                         printk(KERN_WARNING PREFIX
1427                                "hhuuhhuu bug in acpi video driver.\n");
1428
1429                 if (dev->brightness) {
1430                         kfree(dev->brightness->levels);
1431                         kfree(dev->brightness);
1432                 }
1433                 list_del(&dev->entry);
1434                 kfree(dev);
1435         }
1436
1437         mutex_unlock(&video->device_list_lock);
1438
1439         return 0;
1440 }
1441
1442 /* acpi_video interface */
1443
1444 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1445 {
1446         return acpi_video_bus_DOS(video, 0, 0);
1447 }
1448
1449 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1450 {
1451         return acpi_video_bus_DOS(video, 0, 1);
1452 }
1453
1454 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1455 {
1456         struct acpi_video_bus *video = acpi_driver_data(device);
1457         struct input_dev *input;
1458         int keycode = 0;
1459
1460         if (!video)
1461                 return;
1462
1463         input = video->input;
1464
1465         switch (event) {
1466         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1467                                          * most likely via hotkey. */
1468                 acpi_bus_generate_proc_event(device, event, 0);
1469                 if (!acpi_notifier_call_chain(device, event, 0))
1470                         keycode = KEY_SWITCHVIDEOMODE;
1471                 break;
1472
1473         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1474                                          * connector. */
1475                 acpi_video_device_enumerate(video);
1476                 acpi_video_device_rebind(video);
1477                 acpi_bus_generate_proc_event(device, event, 0);
1478                 keycode = KEY_SWITCHVIDEOMODE;
1479                 break;
1480
1481         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1482                 acpi_bus_generate_proc_event(device, event, 0);
1483                 keycode = KEY_SWITCHVIDEOMODE;
1484                 break;
1485         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1486                 acpi_bus_generate_proc_event(device, event, 0);
1487                 keycode = KEY_VIDEO_NEXT;
1488                 break;
1489         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1490                 acpi_bus_generate_proc_event(device, event, 0);
1491                 keycode = KEY_VIDEO_PREV;
1492                 break;
1493
1494         default:
1495                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1496                                   "Unsupported event [0x%x]\n", event));
1497                 break;
1498         }
1499
1500         if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1501                 acpi_notifier_call_chain(device, event, 0);
1502
1503         if (keycode) {
1504                 input_report_key(input, keycode, 1);
1505                 input_sync(input);
1506                 input_report_key(input, keycode, 0);
1507                 input_sync(input);
1508         }
1509
1510         return;
1511 }
1512
1513 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1514 {
1515         struct acpi_video_device *video_device = data;
1516         struct acpi_device *device = NULL;
1517         struct acpi_video_bus *bus;
1518         struct input_dev *input;
1519         int keycode = 0;
1520
1521         if (!video_device)
1522                 return;
1523
1524         device = video_device->dev;
1525         bus = video_device->video;
1526         input = bus->input;
1527
1528         switch (event) {
1529         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1530                 if (brightness_switch_enabled)
1531                         acpi_video_switch_brightness(video_device, event);
1532                 acpi_bus_generate_proc_event(device, event, 0);
1533                 keycode = KEY_BRIGHTNESS_CYCLE;
1534                 break;
1535         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1536                 if (brightness_switch_enabled)
1537                         acpi_video_switch_brightness(video_device, event);
1538                 acpi_bus_generate_proc_event(device, event, 0);
1539                 keycode = KEY_BRIGHTNESSUP;
1540                 break;
1541         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1542                 if (brightness_switch_enabled)
1543                         acpi_video_switch_brightness(video_device, event);
1544                 acpi_bus_generate_proc_event(device, event, 0);
1545                 keycode = KEY_BRIGHTNESSDOWN;
1546                 break;
1547         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1548                 if (brightness_switch_enabled)
1549                         acpi_video_switch_brightness(video_device, event);
1550                 acpi_bus_generate_proc_event(device, event, 0);
1551                 keycode = KEY_BRIGHTNESS_ZERO;
1552                 break;
1553         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1554                 if (brightness_switch_enabled)
1555                         acpi_video_switch_brightness(video_device, event);
1556                 acpi_bus_generate_proc_event(device, event, 0);
1557                 keycode = KEY_DISPLAY_OFF;
1558                 break;
1559         default:
1560                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1561                                   "Unsupported event [0x%x]\n", event));
1562                 break;
1563         }
1564
1565         acpi_notifier_call_chain(device, event, 0);
1566
1567         if (keycode) {
1568                 input_report_key(input, keycode, 1);
1569                 input_sync(input);
1570                 input_report_key(input, keycode, 0);
1571                 input_sync(input);
1572         }
1573
1574         return;
1575 }
1576
1577 static int acpi_video_resume(struct notifier_block *nb,
1578                                 unsigned long val, void *ign)
1579 {
1580         struct acpi_video_bus *video;
1581         struct acpi_video_device *video_device;
1582         int i;
1583
1584         switch (val) {
1585         case PM_HIBERNATION_PREPARE:
1586         case PM_SUSPEND_PREPARE:
1587         case PM_RESTORE_PREPARE:
1588                 return NOTIFY_DONE;
1589         }
1590
1591         video = container_of(nb, struct acpi_video_bus, pm_nb);
1592
1593         dev_info(&video->device->dev, "Restoring backlight state\n");
1594
1595         for (i = 0; i < video->attached_count; i++) {
1596                 video_device = video->attached_array[i].bind_info;
1597                 if (video_device && video_device->backlight)
1598                         acpi_video_set_brightness(video_device->backlight);
1599         }
1600
1601         return NOTIFY_OK;
1602 }
1603
1604 static acpi_status
1605 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1606                         void **return_value)
1607 {
1608         struct acpi_device *device = context;
1609         struct acpi_device *sibling;
1610         int result;
1611
1612         if (handle == device->handle)
1613                 return AE_CTRL_TERMINATE;
1614
1615         result = acpi_bus_get_device(handle, &sibling);
1616         if (result)
1617                 return AE_OK;
1618
1619         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1620                         return AE_ALREADY_EXISTS;
1621
1622         return AE_OK;
1623 }
1624
1625 static int instance;
1626
1627 static int acpi_video_bus_add(struct acpi_device *device)
1628 {
1629         struct acpi_video_bus *video;
1630         struct input_dev *input;
1631         int error;
1632         acpi_status status;
1633
1634         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1635                                 device->parent->handle, 1,
1636                                 acpi_video_bus_match, NULL,
1637                                 device, NULL);
1638         if (status == AE_ALREADY_EXISTS) {
1639                 printk(KERN_WARNING FW_BUG
1640                         "Duplicate ACPI video bus devices for the"
1641                         " same VGA controller, please try module "
1642                         "parameter \"video.allow_duplicates=1\""
1643                         "if the current driver doesn't work.\n");
1644                 if (!allow_duplicates)
1645                         return -ENODEV;
1646         }
1647
1648         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1649         if (!video)
1650                 return -ENOMEM;
1651
1652         /* a hack to fix the duplicate name "VID" problem on T61 */
1653         if (!strcmp(device->pnp.bus_id, "VID")) {
1654                 if (instance)
1655                         device->pnp.bus_id[3] = '0' + instance;
1656                 instance ++;
1657         }
1658         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1659         if (!strcmp(device->pnp.bus_id, "VGA")) {
1660                 if (instance)
1661                         device->pnp.bus_id[3] = '0' + instance;
1662                 instance++;
1663         }
1664
1665         video->device = device;
1666         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1667         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1668         device->driver_data = video;
1669
1670         acpi_video_bus_find_cap(video);
1671         error = acpi_video_bus_check(video);
1672         if (error)
1673                 goto err_free_video;
1674
1675         mutex_init(&video->device_list_lock);
1676         INIT_LIST_HEAD(&video->video_device_list);
1677
1678         acpi_video_bus_get_devices(video, device);
1679         acpi_video_bus_start_devices(video);
1680
1681         video->input = input = input_allocate_device();
1682         if (!input) {
1683                 error = -ENOMEM;
1684                 goto err_stop_video;
1685         }
1686
1687         snprintf(video->phys, sizeof(video->phys),
1688                 "%s/video/input0", acpi_device_hid(video->device));
1689
1690         input->name = acpi_device_name(video->device);
1691         input->phys = video->phys;
1692         input->id.bustype = BUS_HOST;
1693         input->id.product = 0x06;
1694         input->dev.parent = &device->dev;
1695         input->evbit[0] = BIT(EV_KEY);
1696         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1697         set_bit(KEY_VIDEO_NEXT, input->keybit);
1698         set_bit(KEY_VIDEO_PREV, input->keybit);
1699         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1700         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1701         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1702         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1703         set_bit(KEY_DISPLAY_OFF, input->keybit);
1704
1705         error = input_register_device(input);
1706         if (error)
1707                 goto err_free_input_dev;
1708
1709         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1710                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1711                video->flags.multihead ? "yes" : "no",
1712                video->flags.rom ? "yes" : "no",
1713                video->flags.post ? "yes" : "no");
1714
1715         video->pm_nb.notifier_call = acpi_video_resume;
1716         video->pm_nb.priority = 0;
1717         register_pm_notifier(&video->pm_nb);
1718
1719         return 0;
1720
1721  err_free_input_dev:
1722         input_free_device(input);
1723  err_stop_video:
1724         acpi_video_bus_stop_devices(video);
1725         acpi_video_bus_put_devices(video);
1726         kfree(video->attached_array);
1727  err_free_video:
1728         kfree(video);
1729         device->driver_data = NULL;
1730
1731         return error;
1732 }
1733
1734 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1735 {
1736         struct acpi_video_bus *video = NULL;
1737
1738
1739         if (!device || !acpi_driver_data(device))
1740                 return -EINVAL;
1741
1742         video = acpi_driver_data(device);
1743
1744         unregister_pm_notifier(&video->pm_nb);
1745
1746         acpi_video_bus_stop_devices(video);
1747         acpi_video_bus_put_devices(video);
1748
1749         input_unregister_device(video->input);
1750         kfree(video->attached_array);
1751         kfree(video);
1752
1753         return 0;
1754 }
1755
1756 static int __init intel_opregion_present(void)
1757 {
1758 #if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
1759         struct pci_dev *dev = NULL;
1760         u32 address;
1761
1762         for_each_pci_dev(dev) {
1763                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1764                         continue;
1765                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1766                         continue;
1767                 pci_read_config_dword(dev, 0xfc, &address);
1768                 if (!address)
1769                         continue;
1770                 return 1;
1771         }
1772 #endif
1773         return 0;
1774 }
1775
1776 int acpi_video_register(void)
1777 {
1778         int result = 0;
1779         if (register_count) {
1780                 /*
1781                  * if the function of acpi_video_register is already called,
1782                  * don't register the acpi_vide_bus again and return no error.
1783                  */
1784                 return 0;
1785         }
1786
1787         result = acpi_bus_register_driver(&acpi_video_bus);
1788         if (result < 0)
1789                 return -ENODEV;
1790
1791         /*
1792          * When the acpi_video_bus is loaded successfully, increase
1793          * the counter reference.
1794          */
1795         register_count = 1;
1796
1797         return 0;
1798 }
1799 EXPORT_SYMBOL(acpi_video_register);
1800
1801 void acpi_video_unregister(void)
1802 {
1803         if (!register_count) {
1804                 /*
1805                  * If the acpi video bus is already unloaded, don't
1806                  * unload it again and return directly.
1807                  */
1808                 return;
1809         }
1810         acpi_bus_unregister_driver(&acpi_video_bus);
1811
1812         register_count = 0;
1813
1814         return;
1815 }
1816 EXPORT_SYMBOL(acpi_video_unregister);
1817
1818 /*
1819  * This is kind of nasty. Hardware using Intel chipsets may require
1820  * the video opregion code to be run first in order to initialise
1821  * state before any ACPI video calls are made. To handle this we defer
1822  * registration of the video class until the opregion code has run.
1823  */
1824
1825 static int __init acpi_video_init(void)
1826 {
1827         dmi_check_system(video_dmi_table);
1828
1829         if (intel_opregion_present())
1830                 return 0;
1831
1832         return acpi_video_register();
1833 }
1834
1835 static void __exit acpi_video_exit(void)
1836 {
1837         acpi_video_unregister();
1838
1839         return;
1840 }
1841
1842 module_init(acpi_video_init);
1843 module_exit(acpi_video_exit);