drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/input.h>
  34 #include <linux/backlight.h>
  35 #include <linux/thermal.h>
  36 #include <linux/sort.h>
  37 #include <linux/pci.h>
  38 #include <linux/pci_ids.h>
  39 #include <linux/slab.h>
  40 #include <asm/uaccess.h>
  41 #include <linux/dmi.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44 #include <linux/suspend.h>
  45 #include <acpi/video.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  50 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  51 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  52 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  53 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  56
  57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  62
  63 #define MAX_NAME_LEN    20
  64
  65 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  66 ACPI_MODULE_NAME("video");
  67
  68 MODULE_AUTHOR("Bruno Ducrot");
  69 MODULE_DESCRIPTION("ACPI Video Driver");
  70 MODULE_LICENSE("GPL");
  71
  72 static bool brightness_switch_enabled = 1;
  73 module_param(brightness_switch_enabled, bool, 0644);
  74
  75 /*
  76  * By default, we don't allow duplicate ACPI video bus devices
  77  * under the same VGA controller
  78  */
  79 static bool allow_duplicates;
  80 module_param(allow_duplicates, bool, 0644);
  81
  82 /*
  83  * Some BIOSes claim they use minimum backlight at boot,
  84  * and this may bring dimming screen after boot
  85  */
  86 static bool use_bios_initial_backlight = 1;
  87 module_param(use_bios_initial_backlight, bool, 0644);
  88
  89 static int register_count = 0;
  90 static int acpi_video_bus_add(struct acpi_device *device);
  91 static int acpi_video_bus_remove(struct acpi_device *device, 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 struct dmi_system_id video_dmi_table[] __initdata = {
 393         /*
 394          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 395          */
 396         {
 397          .callback = video_set_bqc_offset,
 398          .ident = "Acer Aspire 5720",
 399          .matches = {
 400                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 401                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 402                 },
 403         },
 404         {
 405          .callback = video_set_bqc_offset,
 406          .ident = "Acer Aspire 5710Z",
 407          .matches = {
 408                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 409                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 410                 },
 411         },
 412         {
 413          .callback = video_set_bqc_offset,
 414          .ident = "eMachines E510",
 415          .matches = {
 416                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 417                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 418                 },
 419         },
 420         {
 421          .callback = video_set_bqc_offset,
 422          .ident = "Acer Aspire 5315",
 423          .matches = {
 424                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 425                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 426                 },
 427         },
 428         {
 429          .callback = video_set_bqc_offset,
 430          .ident = "Acer Aspire 7720",
 431          .matches = {
 432                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 433                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 434                 },
 435         },
 436         {}
 437 };
 438
 439 static int
 440 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 441                                         unsigned long long *level, int init)
 442 {
 443         acpi_status status = AE_OK;
 444         int i;
 445
 446         if (device->cap._BQC || device->cap._BCQ) {
 447                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 448
 449                 status = acpi_evaluate_integer(device->dev->handle, buf,
 450                                                 NULL, level);
 451                 if (ACPI_SUCCESS(status)) {
 452                         if (device->brightness->flags._BQC_use_index) {
 453                                 if (device->brightness->flags._BCL_reversed)
 454                                         *level = device->brightness->count
 455                                                                  - 3 - (*level);
 456                                 *level = device->brightness->levels[*level + 2];
 457
 458                         }
 459                         *level += bqc_offset_aml_bug_workaround;
 460                         for (i = 2; i < device->brightness->count; i++)
 461                                 if (device->brightness->levels[i] == *level) {
 462                                         device->brightness->curr = *level;
 463                                         return 0;
 464                         }
 465                         if (!init) {
 466                                 /*
 467                                  * BQC returned an invalid level.
 468                                  * Stop using it.
 469                                  */
 470                                 ACPI_WARNING((AE_INFO,
 471                                               "%s returned an invalid level",
 472                                               buf));
 473                                 device->cap._BQC = device->cap._BCQ = 0;
 474                         }
 475                 } else {
 476                         /* Fixme:
 477                          * should we return an error or ignore this failure?
 478                          * dev->brightness->curr is a cached value which stores
 479                          * the correct current backlight level in most cases.
 480                          * ACPI video backlight still works w/ buggy _BQC.
 481                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 482                          */
 483                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 484                         device->cap._BQC = device->cap._BCQ = 0;
 485                 }
 486         }
 487
 488         *level = device->brightness->curr;
 489         return 0;
 490 }
 491
 492 static int
 493 acpi_video_device_EDID(struct acpi_video_device *device,
 494                        union acpi_object **edid, ssize_t length)
 495 {
 496         int status;
 497         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 498         union acpi_object *obj;
 499         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 500         struct acpi_object_list args = { 1, &arg0 };
 501
 502
 503         *edid = NULL;
 504
 505         if (!device)
 506                 return -ENODEV;
 507         if (length == 128)
 508                 arg0.integer.value = 1;
 509         else if (length == 256)
 510                 arg0.integer.value = 2;
 511         else
 512                 return -EINVAL;
 513
 514         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 515         if (ACPI_FAILURE(status))
 516                 return -ENODEV;
 517
 518         obj = buffer.pointer;
 519
 520         if (obj && obj->type == ACPI_TYPE_BUFFER)
 521                 *edid = obj;
 522         else {
 523                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 524                 status = -EFAULT;
 525                 kfree(obj);
 526         }
 527
 528         return status;
 529 }
 530
 531 /* bus */
 532
 533 /*
 534  *  Arg:
 535  *      video           : video bus device pointer
 536  *      bios_flag       :
 537  *              0.      The system BIOS should NOT automatically switch(toggle)
 538  *                      the active display output.
 539  *              1.      The system BIOS should automatically switch (toggle) the
 540  *                      active display output. No switch event.
 541  *              2.      The _DGS value should be locked.
 542  *              3.      The system BIOS should not automatically switch (toggle) the
 543  *                      active display output, but instead generate the display switch
 544  *                      event notify code.
 545  *      lcd_flag        :
 546  *              0.      The system BIOS should automatically control the brightness level
 547  *                      of the LCD when the power changes from AC to DC
 548  *              1.      The system BIOS should NOT automatically control the brightness
 549  *                      level of the LCD when the power changes from AC to DC.
 550  * Return Value:
 551  *              -EINVAL wrong arg.
 552  */
 553
 554 static int
 555 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 556 {
 557         acpi_status status;
 558         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 559         struct acpi_object_list args = { 1, &arg0 };
 560
 561
 562         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 563                 return -EINVAL;
 564         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 565         video->dos_setting = arg0.integer.value;
 566         status = acpi_evaluate_object(video->device->handle, "_DOS",
 567                 &args, NULL);
 568         if (ACPI_FAILURE(status))
 569                 return -EIO;
 570
 571         return 0;
 572 }
 573
 574 /*
 575  * Simple comparison function used to sort backlight levels.
 576  */
 577
 578 static int
 579 acpi_video_cmp_level(const void *a, const void *b)
 580 {
 581         return *(int *)a - *(int *)b;
 582 }
 583
 584 /*
 585  *  Arg:
 586  *      device  : video output device (LCD, CRT, ..)
 587  *
 588  *  Return Value:
 589  *      Maximum brightness level
 590  *
 591  *  Allocate and initialize device->brightness.
 592  */
 593
 594 static int
 595 acpi_video_init_brightness(struct acpi_video_device *device)
 596 {
 597         union acpi_object *obj = NULL;
 598         int i, max_level = 0, count = 0, level_ac_battery = 0;
 599         unsigned long long level, level_old;
 600         union acpi_object *o;
 601         struct acpi_video_device_brightness *br = NULL;
 602         int result = -EINVAL;
 603
 604         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 605                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 606                                                 "LCD brightness level\n"));
 607                 goto out;
 608         }
 609
 610         if (obj->package.count < 2)
 611                 goto out;
 612
 613         br = kzalloc(sizeof(*br), GFP_KERNEL);
 614         if (!br) {
 615                 printk(KERN_ERR "can't allocate memory\n");
 616                 result = -ENOMEM;
 617                 goto out;
 618         }
 619
 620         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 621                                 GFP_KERNEL);
 622         if (!br->levels) {
 623                 result = -ENOMEM;
 624                 goto out_free;
 625         }
 626
 627         for (i = 0; i < obj->package.count; i++) {
 628                 o = (union acpi_object *)&obj->package.elements[i];
 629                 if (o->type != ACPI_TYPE_INTEGER) {
 630                         printk(KERN_ERR PREFIX "Invalid data\n");
 631                         continue;
 632                 }
 633                 br->levels[count] = (u32) o->integer.value;
 634
 635                 if (br->levels[count] > max_level)
 636                         max_level = br->levels[count];
 637                 count++;
 638         }
 639
 640         /*
 641          * some buggy BIOS don't export the levels
 642          * when machine is on AC/Battery in _BCL package.
 643          * In this case, the first two elements in _BCL packages
 644          * are also supported brightness levels that OS should take care of.
 645          */
 646         for (i = 2; i < count; i++) {
 647                 if (br->levels[i] == br->levels[0])
 648                         level_ac_battery++;
 649                 if (br->levels[i] == br->levels[1])
 650                         level_ac_battery++;
 651         }
 652
 653         if (level_ac_battery < 2) {
 654                 level_ac_battery = 2 - level_ac_battery;
 655                 br->flags._BCL_no_ac_battery_levels = 1;
 656                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 657                         br->levels[i] = br->levels[i - level_ac_battery];
 658                 count += level_ac_battery;
 659         } else if (level_ac_battery > 2)
 660                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));
 661
 662         /* Check if the _BCL package is in a reversed order */
 663         if (max_level == br->levels[2]) {
 664                 br->flags._BCL_reversed = 1;
 665                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 666                         acpi_video_cmp_level, NULL);
 667         } else if (max_level != br->levels[count - 1])
 668                 ACPI_ERROR((AE_INFO,
 669                             "Found unordered _BCL package\n"));
 670
 671         br->count = count;
 672         device->brightness = br;
 673
 674         /* Check the input/output of _BQC/_BCL/_BCM */
 675         if ((max_level < 100) && (max_level <= (count - 2)))
 676                 br->flags._BCL_use_index = 1;
 677
 678         /*
 679          * _BCM is always consistent with _BCL,
 680          * at least for all the laptops we have ever seen.
 681          */
 682         br->flags._BCM_use_index = br->flags._BCL_use_index;
 683
 684         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 685         br->curr = level = max_level;
 686
 687         if (!device->cap._BQC)
 688                 goto set_level;
 689
 690         result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
 691         if (result)
 692                 goto out_free_levels;
 693
 694         /*
 695          * Set the level to maximum and check if _BQC uses indexed value
 696          */
 697         result = acpi_video_device_lcd_set_level(device, max_level);
 698         if (result)
 699                 goto out_free_levels;
 700
 701         result = acpi_video_device_lcd_get_level_current(device, &level, 0);
 702         if (result)
 703                 goto out_free_levels;
 704
 705         br->flags._BQC_use_index = (level == max_level ? 0 : 1);
 706
 707         if (!br->flags._BQC_use_index) {
 708                 /*
 709                  * Set the backlight to the initial state.
 710                  * On some buggy laptops, _BQC returns an uninitialized value
 711                  * when invoked for the first time, i.e. level_old is invalid.
 712                  * set the backlight to max_level in this case
 713                  */
 714                 if (use_bios_initial_backlight) {
 715                         for (i = 2; i < br->count; i++)
 716                                 if (level_old == br->levels[i])
 717                                         level = level_old;
 718                 }
 719                 goto set_level;
 720         }
 721
 722         if (br->flags._BCL_reversed)
 723                 level_old = (br->count - 1) - level_old;
 724         level = br->levels[level_old];
 725
 726 set_level:
 727         result = acpi_video_device_lcd_set_level(device, level);
 728         if (result)
 729                 goto out_free_levels;
 730
 731         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 732                           "found %d brightness levels\n", count - 2));
 733         kfree(obj);
 734         return result;
 735
 736 out_free_levels:
 737         kfree(br->levels);
 738 out_free:
 739         kfree(br);
 740 out:
 741         device->brightness = NULL;
 742         kfree(obj);
 743         return result;
 744 }
 745
 746 /*
 747  *  Arg:
 748  *      device  : video output device (LCD, CRT, ..)
 749  *
 750  *  Return Value:
 751  *      None
 752  *
 753  *  Find out all required AML methods defined under the output
 754  *  device.
 755  */
 756
 757 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 758 {
 759         acpi_handle h_dummy1;
 760
 761         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 762                 device->cap._ADR = 1;
 763         }
 764         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 765                 device->cap._BCL = 1;
 766         }
 767         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 768                 device->cap._BCM = 1;
 769         }
 770         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 771                 device->cap._BQC = 1;
 772         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 773                                 &h_dummy1))) {
 774                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 775                 device->cap._BCQ = 1;
 776         }
 777
 778         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 779                 device->cap._DDC = 1;
 780         }
 781
 782         if (acpi_video_backlight_support()) {
 783                 struct backlight_properties props;
 784                 struct pci_dev *pdev;
 785                 acpi_handle acpi_parent;
 786                 struct device *parent = NULL;
 787                 int result;
 788                 static int count = 0;
 789                 char *name;
 790
 791                 result = acpi_video_init_brightness(device);
 792                 if (result)
 793                         return;
 794                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 795                 if (!name)
 796                         return;
 797                 count++;
 798
 799                 acpi_get_parent(device->dev->handle, &acpi_parent);
 800
 801                 pdev = acpi_get_pci_dev(acpi_parent);
 802                 if (pdev) {
 803                         parent = &pdev->dev;
 804                         pci_dev_put(pdev);
 805                 }
 806
 807                 memset(&props, 0, sizeof(struct backlight_properties));
 808                 props.type = BACKLIGHT_FIRMWARE;
 809                 props.max_brightness = device->brightness->count - 3;
 810                 device->backlight = backlight_device_register(name,
 811                                                               parent,
 812                                                               device,
 813                                                               &acpi_backlight_ops,
 814                                                               &props);
 815                 kfree(name);
 816                 if (IS_ERR(device->backlight))
 817                         return;
 818
 819                 /*
 820                  * Save current brightness level in case we have to restore it
 821                  * before acpi_video_device_lcd_set_level() is called next time.
 822                  */
 823                 device->backlight->props.brightness =
 824                                 acpi_video_get_brightness(device->backlight);
 825
 826                 device->cooling_dev = thermal_cooling_device_register("LCD",
 827                                         device->dev, &video_cooling_ops);
 828                 if (IS_ERR(device->cooling_dev)) {
 829                         /*
 830                          * Set cooling_dev to NULL so we don't crash trying to
 831                          * free it.
 832                          * Also, why the hell we are returning early and
 833                          * not attempt to register video output if cooling
 834                          * device registration failed?
 835                          * -- dtor
 836                          */
 837                         device->cooling_dev = NULL;
 838                         return;
 839                 }
 840
 841                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 842                          device->cooling_dev->id);
 843                 result = sysfs_create_link(&device->dev->dev.kobj,
 844                                 &device->cooling_dev->device.kobj,
 845                                 "thermal_cooling");
 846                 if (result)
 847                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 848                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 849                                 &device->dev->dev.kobj, "device");
 850                 if (result)
 851                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 852
 853         }
 854 }
 855
 856 /*
 857  *  Arg:
 858  *      device  : video output device (VGA)
 859  *
 860  *  Return Value:
 861  *      None
 862  *
 863  *  Find out all required AML methods defined under the video bus device.
 864  */
 865
 866 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 867 {
 868         acpi_handle h_dummy1;
 869
 870         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 871                 video->cap._DOS = 1;
 872         }
 873         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 874                 video->cap._DOD = 1;
 875         }
 876         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 877                 video->cap._ROM = 1;
 878         }
 879         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 880                 video->cap._GPD = 1;
 881         }
 882         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 883                 video->cap._SPD = 1;
 884         }
 885         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 886                 video->cap._VPO = 1;
 887         }
 888 }
 889
 890 /*
 891  * Check whether the video bus device has required AML method to
 892  * support the desired features
 893  */
 894
 895 static int acpi_video_bus_check(struct acpi_video_bus *video)
 896 {
 897         acpi_status status = -ENOENT;
 898         struct pci_dev *dev;
 899
 900         if (!video)
 901                 return -EINVAL;
 902
 903         dev = acpi_get_pci_dev(video->device->handle);
 904         if (!dev)
 905                 return -ENODEV;
 906         pci_dev_put(dev);
 907
 908         /* Since there is no HID, CID and so on for VGA driver, we have
 909          * to check well known required nodes.
 910          */
 911
 912         /* Does this device support video switching? */
 913         if (video->cap._DOS || video->cap._DOD) {
 914                 if (!video->cap._DOS) {
 915                         printk(KERN_WARNING FW_BUG
 916                                 "ACPI(%s) defines _DOD but not _DOS\n",
 917                                 acpi_device_bid(video->device));
 918                 }
 919                 video->flags.multihead = 1;
 920                 status = 0;
 921         }
 922
 923         /* Does this device support retrieving a video ROM? */
 924         if (video->cap._ROM) {
 925                 video->flags.rom = 1;
 926                 status = 0;
 927         }
 928
 929         /* Does this device support configuring which video device to POST? */
 930         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 931                 video->flags.post = 1;
 932                 status = 0;
 933         }
 934
 935         return status;
 936 }
 937
 938 /* --------------------------------------------------------------------------
 939                                  Driver Interface
 940    -------------------------------------------------------------------------- */
 941
 942 /* device interface */
 943 static struct acpi_video_device_attrib*
 944 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 945 {
 946         struct acpi_video_enumerated_device *ids;
 947         int i;
 948
 949         for (i = 0; i < video->attached_count; i++) {
 950                 ids = &video->attached_array[i];
 951                 if ((ids->value.int_val & 0xffff) == device_id)
 952                         return &ids->value.attrib;
 953         }
 954
 955         return NULL;
 956 }
 957
 958 static int
 959 acpi_video_get_device_type(struct acpi_video_bus *video,
 960                            unsigned long device_id)
 961 {
 962         struct acpi_video_enumerated_device *ids;
 963         int i;
 964
 965         for (i = 0; i < video->attached_count; i++) {
 966                 ids = &video->attached_array[i];
 967                 if ((ids->value.int_val & 0xffff) == device_id)
 968                         return ids->value.int_val;
 969         }
 970
 971         return 0;
 972 }
 973
 974 static int
 975 acpi_video_bus_get_one_device(struct acpi_device *device,
 976                               struct acpi_video_bus *video)
 977 {
 978         unsigned long long device_id;
 979         int status, device_type;
 980         struct acpi_video_device *data;
 981         struct acpi_video_device_attrib* attribute;
 982
 983         if (!device || !video)
 984                 return -EINVAL;
 985
 986         status =
 987             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
 988         if (ACPI_SUCCESS(status)) {
 989
 990                 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
 991                 if (!data)
 992                         return -ENOMEM;
 993
 994                 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
 995                 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
 996                 device->driver_data = data;
 997
 998                 data->device_id = device_id;
 999                 data->video = video;
1000                 data->dev = device;
1001
1002                 attribute = acpi_video_get_device_attr(video, device_id);
1003
1004                 if((attribute != NULL) && attribute->device_id_scheme) {
1005                         switch (attribute->display_type) {
1006                         case ACPI_VIDEO_DISPLAY_CRT:
1007                                 data->flags.crt = 1;
1008                                 break;
1009                         case ACPI_VIDEO_DISPLAY_TV:
1010                                 data->flags.tvout = 1;
1011                                 break;
1012                         case ACPI_VIDEO_DISPLAY_DVI:
1013                                 data->flags.dvi = 1;
1014                                 break;
1015                         case ACPI_VIDEO_DISPLAY_LCD:
1016                                 data->flags.lcd = 1;
1017                                 break;
1018                         default:
1019                                 data->flags.unknown = 1;
1020                                 break;
1021                         }
1022                         if(attribute->bios_can_detect)
1023                                 data->flags.bios = 1;
1024                 } else {
1025                         /* Check for legacy IDs */
1026                         device_type = acpi_video_get_device_type(video,
1027                                                                  device_id);
1028                         /* Ignore bits 16 and 18-20 */
1029                         switch (device_type & 0xffe2ffff) {
1030                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1031                                 data->flags.crt = 1;
1032                                 break;
1033                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1034                                 data->flags.lcd = 1;
1035                                 break;
1036                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1037                                 data->flags.tvout = 1;
1038                                 break;
1039                         default:
1040                                 data->flags.unknown = 1;
1041                         }
1042                 }
1043
1044                 acpi_video_device_bind(video, data);
1045                 acpi_video_device_find_cap(data);
1046
1047                 status = acpi_install_notify_handler(device->handle,
1048                                                      ACPI_DEVICE_NOTIFY,
1049                                                      acpi_video_device_notify,
1050                                                      data);
1051                 if (ACPI_FAILURE(status)) {
1052                         printk(KERN_ERR PREFIX
1053                                           "Error installing notify handler\n");
1054                         if(data->brightness)
1055                                 kfree(data->brightness->levels);
1056                         kfree(data->brightness);
1057                         kfree(data);
1058                         return -ENODEV;
1059                 }
1060
1061                 mutex_lock(&video->device_list_lock);
1062                 list_add_tail(&data->entry, &video->video_device_list);
1063                 mutex_unlock(&video->device_list_lock);
1064
1065                 return 0;
1066         }
1067
1068         return -ENOENT;
1069 }
1070
1071 /*
1072  *  Arg:
1073  *      video   : video bus device
1074  *
1075  *  Return:
1076  *      none
1077  *
1078  *  Enumerate the video device list of the video bus,
1079  *  bind the ids with the corresponding video devices
1080  *  under the video bus.
1081  */
1082
1083 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1084 {
1085         struct acpi_video_device *dev;
1086
1087         mutex_lock(&video->device_list_lock);
1088
1089         list_for_each_entry(dev, &video->video_device_list, entry)
1090                 acpi_video_device_bind(video, dev);
1091
1092         mutex_unlock(&video->device_list_lock);
1093 }
1094
1095 /*
1096  *  Arg:
1097  *      video   : video bus device
1098  *      device  : video output device under the video
1099  *              bus
1100  *
1101  *  Return:
1102  *      none
1103  *
1104  *  Bind the ids with the corresponding video devices
1105  *  under the video bus.
1106  */
1107
1108 static void
1109 acpi_video_device_bind(struct acpi_video_bus *video,
1110                        struct acpi_video_device *device)
1111 {
1112         struct acpi_video_enumerated_device *ids;
1113         int i;
1114
1115         for (i = 0; i < video->attached_count; i++) {
1116                 ids = &video->attached_array[i];
1117                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1118                         ids->bind_info = device;
1119                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1120                 }
1121         }
1122 }
1123
1124 /*
1125  *  Arg:
1126  *      video   : video bus device
1127  *
1128  *  Return:
1129  *      < 0     : error
1130  *
1131  *  Call _DOD to enumerate all devices attached to display adapter
1132  *
1133  */
1134
1135 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1136 {
1137         int status;
1138         int count;
1139         int i;
1140         struct acpi_video_enumerated_device *active_list;
1141         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1142         union acpi_object *dod = NULL;
1143         union acpi_object *obj;
1144
1145         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1146         if (!ACPI_SUCCESS(status)) {
1147                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1148                 return status;
1149         }
1150
1151         dod = buffer.pointer;
1152         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1153                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1154                 status = -EFAULT;
1155                 goto out;
1156         }
1157
1158         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1159                           dod->package.count));
1160
1161         active_list = kcalloc(1 + dod->package.count,
1162                               sizeof(struct acpi_video_enumerated_device),
1163                               GFP_KERNEL);
1164         if (!active_list) {
1165                 status = -ENOMEM;
1166                 goto out;
1167         }
1168
1169         count = 0;
1170         for (i = 0; i < dod->package.count; i++) {
1171                 obj = &dod->package.elements[i];
1172
1173                 if (obj->type != ACPI_TYPE_INTEGER) {
1174                         printk(KERN_ERR PREFIX
1175                                 "Invalid _DOD data in element %d\n", i);
1176                         continue;
1177                 }
1178
1179                 active_list[count].value.int_val = obj->integer.value;
1180                 active_list[count].bind_info = NULL;
1181                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1182                                   (int)obj->integer.value));
1183                 count++;
1184         }
1185
1186         kfree(video->attached_array);
1187
1188         video->attached_array = active_list;
1189         video->attached_count = count;
1190
1191  out:
1192         kfree(buffer.pointer);
1193         return status;
1194 }
1195
1196 static int
1197 acpi_video_get_next_level(struct acpi_video_device *device,
1198                           u32 level_current, u32 event)
1199 {
1200         int min, max, min_above, max_below, i, l, delta = 255;
1201         max = max_below = 0;
1202         min = min_above = 255;
1203         /* Find closest level to level_current */
1204         for (i = 2; i < device->brightness->count; i++) {
1205                 l = device->brightness->levels[i];
1206                 if (abs(l - level_current) < abs(delta)) {
1207                         delta = l - level_current;
1208                         if (!delta)
1209                                 break;
1210                 }
1211         }
1212         /* Ajust level_current to closest available level */
1213         level_current += delta;
1214         for (i = 2; i < device->brightness->count; i++) {
1215                 l = device->brightness->levels[i];
1216                 if (l < min)
1217                         min = l;
1218                 if (l > max)
1219                         max = l;
1220                 if (l < min_above && l > level_current)
1221                         min_above = l;
1222                 if (l > max_below && l < level_current)
1223                         max_below = l;
1224         }
1225
1226         switch (event) {
1227         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1228                 return (level_current < max) ? min_above : min;
1229         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1230                 return (level_current < max) ? min_above : max;
1231         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1232                 return (level_current > min) ? max_below : min;
1233         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1234         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1235                 return 0;
1236         default:
1237                 return level_current;
1238         }
1239 }
1240
1241 static int
1242 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1243 {
1244         unsigned long long level_current, level_next;
1245         int result = -EINVAL;
1246
1247         /* no warning message if acpi_backlight=vendor is used */
1248         if (!acpi_video_backlight_support())
1249                 return 0;
1250
1251         if (!device->brightness)
1252                 goto out;
1253
1254         result = acpi_video_device_lcd_get_level_current(device,
1255                                                          &level_current, 0);
1256         if (result)
1257                 goto out;
1258
1259         level_next = acpi_video_get_next_level(device, level_current, event);
1260
1261         result = acpi_video_device_lcd_set_level(device, level_next);
1262
1263         if (!result)
1264                 backlight_force_update(device->backlight,
1265                                        BACKLIGHT_UPDATE_HOTKEY);
1266
1267 out:
1268         if (result)
1269                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1270
1271         return result;
1272 }
1273
1274 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1275                         void **edid)
1276 {
1277         struct acpi_video_bus *video;
1278         struct acpi_video_device *video_device;
1279         union acpi_object *buffer = NULL;
1280         acpi_status status;
1281         int i, length;
1282
1283         if (!device || !acpi_driver_data(device))
1284                 return -EINVAL;
1285
1286         video = acpi_driver_data(device);
1287
1288         for (i = 0; i < video->attached_count; i++) {
1289                 video_device = video->attached_array[i].bind_info;
1290                 length = 256;
1291
1292                 if (!video_device)
1293                         continue;
1294
1295                 if (!video_device->cap._DDC)
1296                         continue;
1297
1298                 if (type) {
1299                         switch (type) {
1300                         case ACPI_VIDEO_DISPLAY_CRT:
1301                                 if (!video_device->flags.crt)
1302                                         continue;
1303                                 break;
1304                         case ACPI_VIDEO_DISPLAY_TV:
1305                                 if (!video_device->flags.tvout)
1306                                         continue;
1307                                 break;
1308                         case ACPI_VIDEO_DISPLAY_DVI:
1309                                 if (!video_device->flags.dvi)
1310                                         continue;
1311                                 break;
1312                         case ACPI_VIDEO_DISPLAY_LCD:
1313                                 if (!video_device->flags.lcd)
1314                                         continue;
1315                                 break;
1316                         }
1317                 } else if (video_device->device_id != device_id) {
1318                         continue;
1319                 }
1320
1321                 status = acpi_video_device_EDID(video_device, &buffer, length);
1322
1323                 if (ACPI_FAILURE(status) || !buffer ||
1324                     buffer->type != ACPI_TYPE_BUFFER) {
1325                         length = 128;
1326                         status = acpi_video_device_EDID(video_device, &buffer,
1327                                                         length);
1328                         if (ACPI_FAILURE(status) || !buffer ||
1329                             buffer->type != ACPI_TYPE_BUFFER) {
1330                                 continue;
1331                         }
1332                 }
1333
1334                 *edid = buffer->buffer.pointer;
1335                 return length;
1336         }
1337
1338         return -ENODEV;
1339 }
1340 EXPORT_SYMBOL(acpi_video_get_edid);
1341
1342 static int
1343 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1344                            struct acpi_device *device)
1345 {
1346         int status;
1347         struct acpi_device *dev;
1348
1349         status = acpi_video_device_enumerate(video);
1350         if (status)
1351                 return status;
1352
1353         list_for_each_entry(dev, &device->children, node) {
1354
1355                 status = acpi_video_bus_get_one_device(dev, video);
1356                 if (status) {
1357                         printk(KERN_WARNING PREFIX
1358                                         "Can't attach device\n");
1359                         continue;
1360                 }
1361         }
1362         return status;
1363 }
1364
1365 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1366 {
1367         acpi_status status;
1368
1369         if (!device || !device->video)
1370                 return -ENOENT;
1371
1372         status = acpi_remove_notify_handler(device->dev->handle,
1373                                             ACPI_DEVICE_NOTIFY,
1374                                             acpi_video_device_notify);
1375         if (ACPI_FAILURE(status)) {
1376                 printk(KERN_WARNING PREFIX
1377                        "Can't remove video notify handler\n");
1378         }
1379         if (device->backlight) {
1380                 backlight_device_unregister(device->backlight);
1381                 device->backlight = NULL;
1382         }
1383         if (device->cooling_dev) {
1384                 sysfs_remove_link(&device->dev->dev.kobj,
1385                                   "thermal_cooling");
1386                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1387                                   "device");
1388                 thermal_cooling_device_unregister(device->cooling_dev);
1389                 device->cooling_dev = NULL;
1390         }
1391
1392         return 0;
1393 }
1394
1395 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1396 {
1397         int status;
1398         struct acpi_video_device *dev, *next;
1399
1400         mutex_lock(&video->device_list_lock);
1401
1402         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1403
1404                 status = acpi_video_bus_put_one_device(dev);
1405                 if (ACPI_FAILURE(status))
1406                         printk(KERN_WARNING PREFIX
1407                                "hhuuhhuu bug in acpi video driver.\n");
1408
1409                 if (dev->brightness) {
1410                         kfree(dev->brightness->levels);
1411                         kfree(dev->brightness);
1412                 }
1413                 list_del(&dev->entry);
1414                 kfree(dev);
1415         }
1416
1417         mutex_unlock(&video->device_list_lock);
1418
1419         return 0;
1420 }
1421
1422 /* acpi_video interface */
1423
1424 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1425 {
1426         return acpi_video_bus_DOS(video, 0, 0);
1427 }
1428
1429 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1430 {
1431         return acpi_video_bus_DOS(video, 0, 1);
1432 }
1433
1434 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1435 {
1436         struct acpi_video_bus *video = acpi_driver_data(device);
1437         struct input_dev *input;
1438         int keycode = 0;
1439
1440         if (!video)
1441                 return;
1442
1443         input = video->input;
1444
1445         switch (event) {
1446         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1447                                          * most likely via hotkey. */
1448                 acpi_bus_generate_proc_event(device, event, 0);
1449                 if (!acpi_notifier_call_chain(device, event, 0))
1450                         keycode = KEY_SWITCHVIDEOMODE;
1451                 break;
1452
1453         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1454                                          * connector. */
1455                 acpi_video_device_enumerate(video);
1456                 acpi_video_device_rebind(video);
1457                 acpi_bus_generate_proc_event(device, event, 0);
1458                 keycode = KEY_SWITCHVIDEOMODE;
1459                 break;
1460
1461         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1462                 acpi_bus_generate_proc_event(device, event, 0);
1463                 keycode = KEY_SWITCHVIDEOMODE;
1464                 break;
1465         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1466                 acpi_bus_generate_proc_event(device, event, 0);
1467                 keycode = KEY_VIDEO_NEXT;
1468                 break;
1469         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1470                 acpi_bus_generate_proc_event(device, event, 0);
1471                 keycode = KEY_VIDEO_PREV;
1472                 break;
1473
1474         default:
1475                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1476                                   "Unsupported event [0x%x]\n", event));
1477                 break;
1478         }
1479
1480         if (event != ACPI_VIDEO_NOTIFY_SWITCH)
1481                 acpi_notifier_call_chain(device, event, 0);
1482
1483         if (keycode) {
1484                 input_report_key(input, keycode, 1);
1485                 input_sync(input);
1486                 input_report_key(input, keycode, 0);
1487                 input_sync(input);
1488         }
1489
1490         return;
1491 }
1492
1493 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1494 {
1495         struct acpi_video_device *video_device = data;
1496         struct acpi_device *device = NULL;
1497         struct acpi_video_bus *bus;
1498         struct input_dev *input;
1499         int keycode = 0;
1500
1501         if (!video_device)
1502                 return;
1503
1504         device = video_device->dev;
1505         bus = video_device->video;
1506         input = bus->input;
1507
1508         switch (event) {
1509         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1510                 if (brightness_switch_enabled)
1511                         acpi_video_switch_brightness(video_device, event);
1512                 acpi_bus_generate_proc_event(device, event, 0);
1513                 keycode = KEY_BRIGHTNESS_CYCLE;
1514                 break;
1515         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1516                 if (brightness_switch_enabled)
1517                         acpi_video_switch_brightness(video_device, event);
1518                 acpi_bus_generate_proc_event(device, event, 0);
1519                 keycode = KEY_BRIGHTNESSUP;
1520                 break;
1521         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1522                 if (brightness_switch_enabled)
1523                         acpi_video_switch_brightness(video_device, event);
1524                 acpi_bus_generate_proc_event(device, event, 0);
1525                 keycode = KEY_BRIGHTNESSDOWN;
1526                 break;
1527         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1528                 if (brightness_switch_enabled)
1529                         acpi_video_switch_brightness(video_device, event);
1530                 acpi_bus_generate_proc_event(device, event, 0);
1531                 keycode = KEY_BRIGHTNESS_ZERO;
1532                 break;
1533         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1534                 if (brightness_switch_enabled)
1535                         acpi_video_switch_brightness(video_device, event);
1536                 acpi_bus_generate_proc_event(device, event, 0);
1537                 keycode = KEY_DISPLAY_OFF;
1538                 break;
1539         default:
1540                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1541                                   "Unsupported event [0x%x]\n", event));
1542                 break;
1543         }
1544
1545         acpi_notifier_call_chain(device, event, 0);
1546
1547         if (keycode) {
1548                 input_report_key(input, keycode, 1);
1549                 input_sync(input);
1550                 input_report_key(input, keycode, 0);
1551                 input_sync(input);
1552         }
1553
1554         return;
1555 }
1556
1557 static int acpi_video_resume(struct notifier_block *nb,
1558                                 unsigned long val, void *ign)
1559 {
1560         struct acpi_video_bus *video;
1561         struct acpi_video_device *video_device;
1562         int i;
1563
1564         switch (val) {
1565         case PM_HIBERNATION_PREPARE:
1566         case PM_SUSPEND_PREPARE:
1567         case PM_RESTORE_PREPARE:
1568                 return NOTIFY_DONE;
1569         }
1570
1571         video = container_of(nb, struct acpi_video_bus, pm_nb);
1572
1573         dev_info(&video->device->dev, "Restoring backlight state\n");
1574
1575         for (i = 0; i < video->attached_count; i++) {
1576                 video_device = video->attached_array[i].bind_info;
1577                 if (video_device && video_device->backlight)
1578                         acpi_video_set_brightness(video_device->backlight);
1579         }
1580
1581         return NOTIFY_OK;
1582 }
1583
1584 static acpi_status
1585 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1586                         void **return_value)
1587 {
1588         struct acpi_device *device = context;
1589         struct acpi_device *sibling;
1590         int result;
1591
1592         if (handle == device->handle)
1593                 return AE_CTRL_TERMINATE;
1594
1595         result = acpi_bus_get_device(handle, &sibling);
1596         if (result)
1597                 return AE_OK;
1598
1599         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1600                         return AE_ALREADY_EXISTS;
1601
1602         return AE_OK;
1603 }
1604
1605 static int instance;
1606
1607 static int acpi_video_bus_add(struct acpi_device *device)
1608 {
1609         struct acpi_video_bus *video;
1610         struct input_dev *input;
1611         int error;
1612         acpi_status status;
1613
1614         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1615                                 device->parent->handle, 1,
1616                                 acpi_video_bus_match, NULL,
1617                                 device, NULL);
1618         if (status == AE_ALREADY_EXISTS) {
1619                 printk(KERN_WARNING FW_BUG
1620                         "Duplicate ACPI video bus devices for the"
1621                         " same VGA controller, please try module "
1622                         "parameter \"video.allow_duplicates=1\""
1623                         "if the current driver doesn't work.\n");
1624                 if (!allow_duplicates)
1625                         return -ENODEV;
1626         }
1627
1628         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1629         if (!video)
1630                 return -ENOMEM;
1631
1632         /* a hack to fix the duplicate name "VID" problem on T61 */
1633         if (!strcmp(device->pnp.bus_id, "VID")) {
1634                 if (instance)
1635                         device->pnp.bus_id[3] = '0' + instance;
1636                 instance ++;
1637         }
1638         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1639         if (!strcmp(device->pnp.bus_id, "VGA")) {
1640                 if (instance)
1641                         device->pnp.bus_id[3] = '0' + instance;
1642                 instance++;
1643         }
1644
1645         video->device = device;
1646         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1647         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1648         device->driver_data = video;
1649
1650         acpi_video_bus_find_cap(video);
1651         error = acpi_video_bus_check(video);
1652         if (error)
1653                 goto err_free_video;
1654
1655         mutex_init(&video->device_list_lock);
1656         INIT_LIST_HEAD(&video->video_device_list);
1657
1658         error = acpi_video_bus_get_devices(video, device);
1659         if (error)
1660                 goto err_free_video;
1661
1662         video->input = input = input_allocate_device();
1663         if (!input) {
1664                 error = -ENOMEM;
1665                 goto err_put_video;
1666         }
1667
1668         error = acpi_video_bus_start_devices(video);
1669         if (error)
1670                 goto err_free_input_dev;
1671
1672         snprintf(video->phys, sizeof(video->phys),
1673                 "%s/video/input0", acpi_device_hid(video->device));
1674
1675         input->name = acpi_device_name(video->device);
1676         input->phys = video->phys;
1677         input->id.bustype = BUS_HOST;
1678         input->id.product = 0x06;
1679         input->dev.parent = &device->dev;
1680         input->evbit[0] = BIT(EV_KEY);
1681         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1682         set_bit(KEY_VIDEO_NEXT, input->keybit);
1683         set_bit(KEY_VIDEO_PREV, input->keybit);
1684         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1685         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1686         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1687         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1688         set_bit(KEY_DISPLAY_OFF, input->keybit);
1689
1690         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1691                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1692                video->flags.multihead ? "yes" : "no",
1693                video->flags.rom ? "yes" : "no",
1694                video->flags.post ? "yes" : "no");
1695
1696         video->pm_nb.notifier_call = acpi_video_resume;
1697         video->pm_nb.priority = 0;
1698         error = register_pm_notifier(&video->pm_nb);
1699         if (error)
1700                 goto err_stop_video;
1701
1702         error = input_register_device(input);
1703         if (error)
1704                 goto err_unregister_pm_notifier;
1705
1706         return 0;
1707
1708  err_unregister_pm_notifier:
1709         unregister_pm_notifier(&video->pm_nb);
1710  err_stop_video:
1711         acpi_video_bus_stop_devices(video);
1712  err_free_input_dev:
1713         input_free_device(input);
1714  err_put_video:
1715         acpi_video_bus_put_devices(video);
1716         kfree(video->attached_array);
1717  err_free_video:
1718         kfree(video);
1719         device->driver_data = NULL;
1720
1721         return error;
1722 }
1723
1724 static int acpi_video_bus_remove(struct acpi_device *device, int type)
1725 {
1726         struct acpi_video_bus *video = NULL;
1727
1728
1729         if (!device || !acpi_driver_data(device))
1730                 return -EINVAL;
1731
1732         video = acpi_driver_data(device);
1733
1734         unregister_pm_notifier(&video->pm_nb);
1735
1736         acpi_video_bus_stop_devices(video);
1737         acpi_video_bus_put_devices(video);
1738
1739         input_unregister_device(video->input);
1740         kfree(video->attached_array);
1741         kfree(video);
1742
1743         return 0;
1744 }
1745
1746 static int __init is_i740(struct pci_dev *dev)
1747 {
1748         if (dev->device == 0x00D1)
1749                 return 1;
1750         if (dev->device == 0x7000)
1751                 return 1;
1752         return 0;
1753 }
1754
1755 static int __init intel_opregion_present(void)
1756 {
1757         int opregion = 0;
1758         struct pci_dev *dev = NULL;
1759         u32 address;
1760
1761         for_each_pci_dev(dev) {
1762                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1763                         continue;
1764                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1765                         continue;
1766                 /* We don't want to poke around undefined i740 registers */
1767                 if (is_i740(dev))
1768                         continue;
1769                 pci_read_config_dword(dev, 0xfc, &address);
1770                 if (!address)
1771                         continue;
1772                 opregion = 1;
1773         }
1774         return opregion;
1775 }
1776
1777 int acpi_video_register(void)
1778 {
1779         int result = 0;
1780         if (register_count) {
1781                 /*
1782                  * if the function of acpi_video_register is already called,
1783                  * don't register the acpi_vide_bus again and return no error.
1784                  */
1785                 return 0;
1786         }
1787
1788         result = acpi_bus_register_driver(&acpi_video_bus);
1789         if (result < 0)
1790                 return -ENODEV;
1791
1792         /*
1793          * When the acpi_video_bus is loaded successfully, increase
1794          * the counter reference.
1795          */
1796         register_count = 1;
1797
1798         return 0;
1799 }
1800 EXPORT_SYMBOL(acpi_video_register);
1801
1802 void acpi_video_unregister(void)
1803 {
1804         if (!register_count) {
1805                 /*
1806                  * If the acpi video bus is already unloaded, don't
1807                  * unload it again and return directly.
1808                  */
1809                 return;
1810         }
1811         acpi_bus_unregister_driver(&acpi_video_bus);
1812
1813         register_count = 0;
1814
1815         return;
1816 }
1817 EXPORT_SYMBOL(acpi_video_unregister);
1818
1819 /*
1820  * This is kind of nasty. Hardware using Intel chipsets may require
1821  * the video opregion code to be run first in order to initialise
1822  * state before any ACPI video calls are made. To handle this we defer
1823  * registration of the video class until the opregion code has run.
1824  */
1825
1826 static int __init acpi_video_init(void)
1827 {
1828         dmi_check_system(video_dmi_table);
1829
1830         if (intel_opregion_present())
1831                 return 0;
1832
1833         return acpi_video_register();
1834 }
1835
1836 static void __exit acpi_video_exit(void)
1837 {
1838         acpi_video_unregister();
1839
1840         return;
1841 }
1842
1843 module_init(acpi_video_init);
1844 module_exit(acpi_video_exit);