Pileus Git - ~andy/linux/blob - drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver
   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 <linux/dmi.h>
  41 #include <linux/suspend.h>
  42 #include <linux/acpi.h>
  43 #include <acpi/video.h>
  44 #include <asm/uaccess.h>
  45
  46 #include "internal.h"
  47
  48 #define PREFIX "ACPI: "
  49
  50 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  51 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  52 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  53 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  54 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  55 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  56 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  57
  58 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  59 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  60 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  61 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  62 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  63
  64 #define MAX_NAME_LEN    20
  65
  66 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  67 ACPI_MODULE_NAME("video");
  68
  69 MODULE_AUTHOR("Bruno Ducrot");
  70 MODULE_DESCRIPTION("ACPI Video Driver");
  71 MODULE_LICENSE("GPL");
  72
  73 static bool brightness_switch_enabled = 1;
  74 module_param(brightness_switch_enabled, bool, 0644);
  75
  76 /*
  77  * By default, we don't allow duplicate ACPI video bus devices
  78  * under the same VGA controller
  79  */
  80 static bool allow_duplicates;
  81 module_param(allow_duplicates, bool, 0644);
  82
  83 /*
  84  * For Windows 8 systems: if set ture and the GPU driver has
  85  * registered a backlight interface, skip registering ACPI video's.
  86  */
  87 static bool use_native_backlight = false;
  88 module_param(use_native_backlight, bool, 0644);
  89
  90 static int register_count;
  91 static struct mutex video_list_lock;
  92 static struct list_head video_bus_head;
  93 static int acpi_video_bus_add(struct acpi_device *device);
  94 static int acpi_video_bus_remove(struct acpi_device *device);
  95 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  96
  97 static const struct acpi_device_id video_device_ids[] = {
  98         {ACPI_VIDEO_HID, 0},
  99         {"", 0},
 100 };
 101 MODULE_DEVICE_TABLE(acpi, video_device_ids);
 102
 103 static struct acpi_driver acpi_video_bus = {
 104         .name = "video",
 105         .class = ACPI_VIDEO_CLASS,
 106         .ids = video_device_ids,
 107         .ops = {
 108                 .add = acpi_video_bus_add,
 109                 .remove = acpi_video_bus_remove,
 110                 .notify = acpi_video_bus_notify,
 111                 },
 112 };
 113
 114 struct acpi_video_bus_flags {
 115         u8 multihead:1;         /* can switch video heads */
 116         u8 rom:1;               /* can retrieve a video rom */
 117         u8 post:1;              /* can configure the head to */
 118         u8 reserved:5;
 119 };
 120
 121 struct acpi_video_bus_cap {
 122         u8 _DOS:1;              /* Enable/Disable output switching */
 123         u8 _DOD:1;              /* Enumerate all devices attached to display adapter */
 124         u8 _ROM:1;              /* Get ROM Data */
 125         u8 _GPD:1;              /* Get POST Device */
 126         u8 _SPD:1;              /* Set POST Device */
 127         u8 _VPO:1;              /* Video POST Options */
 128         u8 reserved:2;
 129 };
 130
 131 struct acpi_video_device_attrib {
 132         u32 display_index:4;    /* A zero-based instance of the Display */
 133         u32 display_port_attachment:4;  /* This field differentiates the display type */
 134         u32 display_type:4;     /* Describe the specific type in use */
 135         u32 vendor_specific:4;  /* Chipset Vendor Specific */
 136         u32 bios_can_detect:1;  /* BIOS can detect the device */
 137         u32 depend_on_vga:1;    /* Non-VGA output device whose power is related to
 138                                    the VGA device. */
 139         u32 pipe_id:3;          /* For VGA multiple-head devices. */
 140         u32 reserved:10;        /* Must be 0 */
 141         u32 device_id_scheme:1; /* Device ID Scheme */
 142 };
 143
 144 struct acpi_video_enumerated_device {
 145         union {
 146                 u32 int_val;
 147                 struct acpi_video_device_attrib attrib;
 148         } value;
 149         struct acpi_video_device *bind_info;
 150 };
 151
 152 struct acpi_video_bus {
 153         struct acpi_device *device;
 154         u8 dos_setting;
 155         struct acpi_video_enumerated_device *attached_array;
 156         u8 attached_count;
 157         struct acpi_video_bus_cap cap;
 158         struct acpi_video_bus_flags flags;
 159         struct list_head video_device_list;
 160         struct mutex device_list_lock;  /* protects video_device_list */
 161         struct list_head entry;
 162         struct input_dev *input;
 163         char phys[32];  /* for input device */
 164         struct notifier_block pm_nb;
 165 };
 166
 167 struct acpi_video_device_flags {
 168         u8 crt:1;
 169         u8 lcd:1;
 170         u8 tvout:1;
 171         u8 dvi:1;
 172         u8 bios:1;
 173         u8 unknown:1;
 174         u8 notify:1;
 175         u8 reserved:1;
 176 };
 177
 178 struct acpi_video_device_cap {
 179         u8 _ADR:1;              /* Return the unique ID */
 180         u8 _BCL:1;              /* Query list of brightness control levels supported */
 181         u8 _BCM:1;              /* Set the brightness level */
 182         u8 _BQC:1;              /* Get current brightness level */
 183         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 184         u8 _DDC:1;              /* Return the EDID for this device */
 185 };
 186
 187 struct acpi_video_brightness_flags {
 188         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 189         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order */
 190         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 191 };
 192
 193 struct acpi_video_device_brightness {
 194         int curr;
 195         int count;
 196         int *levels;
 197         struct acpi_video_brightness_flags flags;
 198 };
 199
 200 struct acpi_video_device {
 201         unsigned long device_id;
 202         struct acpi_video_device_flags flags;
 203         struct acpi_video_device_cap cap;
 204         struct list_head entry;
 205         struct acpi_video_bus *video;
 206         struct acpi_device *dev;
 207         struct acpi_video_device_brightness *brightness;
 208         struct backlight_device *backlight;
 209         struct thermal_cooling_device *cooling_dev;
 210 };
 211
 212 static const char device_decode[][30] = {
 213         "motherboard VGA device",
 214         "PCI VGA device",
 215         "AGP VGA device",
 216         "UNKNOWN",
 217 };
 218
 219 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 220 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 221 static void acpi_video_device_bind(struct acpi_video_bus *video,
 222                                    struct acpi_video_device *device);
 223 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 224 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 225                         int level);
 226 static int acpi_video_device_lcd_get_level_current(
 227                         struct acpi_video_device *device,
 228                         unsigned long long *level, bool raw);
 229 static int acpi_video_get_next_level(struct acpi_video_device *device,
 230                                      u32 level_current, u32 event);
 231 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 232                                          int event);
 233
 234 static bool acpi_video_verify_backlight_support(void)
 235 {
 236         if (acpi_osi_is_win8() && use_native_backlight &&
 237             backlight_device_registered(BACKLIGHT_RAW))
 238                 return false;
 239         return acpi_video_backlight_support();
 240 }
 241
 242 /* backlight device sysfs support */
 243 static int acpi_video_get_brightness(struct backlight_device *bd)
 244 {
 245         unsigned long long cur_level;
 246         int i;
 247         struct acpi_video_device *vd = bl_get_data(bd);
 248
 249         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 250                 return -EINVAL;
 251         for (i = 2; i < vd->brightness->count; i++) {
 252                 if (vd->brightness->levels[i] == cur_level)
 253                         /*
 254                          * The first two entries are special - see page 575
 255                          * of the ACPI spec 3.0
 256                          */
 257                         return i - 2;
 258         }
 259         return 0;
 260 }
 261
 262 static int acpi_video_set_brightness(struct backlight_device *bd)
 263 {
 264         int request_level = bd->props.brightness + 2;
 265         struct acpi_video_device *vd = bl_get_data(bd);
 266
 267         return acpi_video_device_lcd_set_level(vd,
 268                                 vd->brightness->levels[request_level]);
 269 }
 270
 271 static const struct backlight_ops acpi_backlight_ops = {
 272         .get_brightness = acpi_video_get_brightness,
 273         .update_status  = acpi_video_set_brightness,
 274 };
 275
 276 /* thermal cooling device callbacks */
 277 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 278                                long *state)
 279 {
 280         struct acpi_device *device = cooling_dev->devdata;
 281         struct acpi_video_device *video = acpi_driver_data(device);
 282
 283         *state = video->brightness->count - 3;
 284         return 0;
 285 }
 286
 287 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 288                                long *state)
 289 {
 290         struct acpi_device *device = cooling_dev->devdata;
 291         struct acpi_video_device *video = acpi_driver_data(device);
 292         unsigned long long level;
 293         int offset;
 294
 295         if (acpi_video_device_lcd_get_level_current(video, &level, false))
 296                 return -EINVAL;
 297         for (offset = 2; offset < video->brightness->count; offset++)
 298                 if (level == video->brightness->levels[offset]) {
 299                         *state = video->brightness->count - offset - 1;
 300                         return 0;
 301                 }
 302
 303         return -EINVAL;
 304 }
 305
 306 static int
 307 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 308 {
 309         struct acpi_device *device = cooling_dev->devdata;
 310         struct acpi_video_device *video = acpi_driver_data(device);
 311         int level;
 312
 313         if (state >= video->brightness->count - 2)
 314                 return -EINVAL;
 315
 316         state = video->brightness->count - state;
 317         level = video->brightness->levels[state - 1];
 318         return acpi_video_device_lcd_set_level(video, level);
 319 }
 320
 321 static const struct thermal_cooling_device_ops video_cooling_ops = {
 322         .get_max_state = video_get_max_state,
 323         .get_cur_state = video_get_cur_state,
 324         .set_cur_state = video_set_cur_state,
 325 };
 326
 327 /*
 328  * --------------------------------------------------------------------------
 329  *                             Video Management
 330  * --------------------------------------------------------------------------
 331  */
 332
 333 static int
 334 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 335                                    union acpi_object **levels)
 336 {
 337         int status;
 338         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 339         union acpi_object *obj;
 340
 341
 342         *levels = NULL;
 343
 344         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 345         if (!ACPI_SUCCESS(status))
 346                 return status;
 347         obj = (union acpi_object *)buffer.pointer;
 348         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 349                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 350                 status = -EFAULT;
 351                 goto err;
 352         }
 353
 354         *levels = obj;
 355
 356         return 0;
 357
 358 err:
 359         kfree(buffer.pointer);
 360
 361         return status;
 362 }
 363
 364 static int
 365 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 366 {
 367         int status;
 368         int state;
 369
 370         status = acpi_execute_simple_method(device->dev->handle,
 371                                             "_BCM", level);
 372         if (ACPI_FAILURE(status)) {
 373                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 374                 return -EIO;
 375         }
 376
 377         device->brightness->curr = level;
 378         for (state = 2; state < device->brightness->count; state++)
 379                 if (level == device->brightness->levels[state]) {
 380                         if (device->backlight)
 381                                 device->backlight->props.brightness = state - 2;
 382                         return 0;
 383                 }
 384
 385         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 386         return -EINVAL;
 387 }
 388
 389 /*
 390  * For some buggy _BQC methods, we need to add a constant value to
 391  * the _BQC return value to get the actual current brightness level
 392  */
 393
 394 static int bqc_offset_aml_bug_workaround;
 395 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 396 {
 397         bqc_offset_aml_bug_workaround = 9;
 398         return 0;
 399 }
 400
 401 static struct dmi_system_id video_dmi_table[] __initdata = {
 402         /*
 403          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 404          */
 405         {
 406          .callback = video_set_bqc_offset,
 407          .ident = "Acer Aspire 5720",
 408          .matches = {
 409                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 410                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 411                 },
 412         },
 413         {
 414          .callback = video_set_bqc_offset,
 415          .ident = "Acer Aspire 5710Z",
 416          .matches = {
 417                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 418                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 419                 },
 420         },
 421         {
 422          .callback = video_set_bqc_offset,
 423          .ident = "eMachines E510",
 424          .matches = {
 425                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 426                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 427                 },
 428         },
 429         {
 430          .callback = video_set_bqc_offset,
 431          .ident = "Acer Aspire 5315",
 432          .matches = {
 433                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 434                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 435                 },
 436         },
 437         {
 438          .callback = video_set_bqc_offset,
 439          .ident = "Acer Aspire 7720",
 440          .matches = {
 441                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 442                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 443                 },
 444         },
 445         {}
 446 };
 447
 448 static unsigned long long
 449 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 450                               unsigned long long bqc_value)
 451 {
 452         unsigned long long level;
 453
 454         if (device->brightness->flags._BQC_use_index) {
 455                 /*
 456                  * _BQC returns an index that doesn't account for
 457                  * the first 2 items with special meaning, so we need
 458                  * to compensate for that by offsetting ourselves
 459                  */
 460                 if (device->brightness->flags._BCL_reversed)
 461                         bqc_value = device->brightness->count - 3 - bqc_value;
 462
 463                 level = device->brightness->levels[bqc_value + 2];
 464         } else {
 465                 level = bqc_value;
 466         }
 467
 468         level += bqc_offset_aml_bug_workaround;
 469
 470         return level;
 471 }
 472
 473 static int
 474 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 475                                         unsigned long long *level, bool raw)
 476 {
 477         acpi_status status = AE_OK;
 478         int i;
 479
 480         if (device->cap._BQC || device->cap._BCQ) {
 481                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 482
 483                 status = acpi_evaluate_integer(device->dev->handle, buf,
 484                                                 NULL, level);
 485                 if (ACPI_SUCCESS(status)) {
 486                         if (raw) {
 487                                 /*
 488                                  * Caller has indicated he wants the raw
 489                                  * value returned by _BQC, so don't furtherly
 490                                  * mess with the value.
 491                                  */
 492                                 return 0;
 493                         }
 494
 495                         *level = acpi_video_bqc_value_to_level(device, *level);
 496
 497                         for (i = 2; i < device->brightness->count; i++)
 498                                 if (device->brightness->levels[i] == *level) {
 499                                         device->brightness->curr = *level;
 500                                         return 0;
 501                                 }
 502                         /*
 503                          * BQC returned an invalid level.
 504                          * Stop using it.
 505                          */
 506                         ACPI_WARNING((AE_INFO,
 507                                       "%s returned an invalid level",
 508                                       buf));
 509                         device->cap._BQC = device->cap._BCQ = 0;
 510                 } else {
 511                         /*
 512                          * Fixme:
 513                          * should we return an error or ignore this failure?
 514                          * dev->brightness->curr is a cached value which stores
 515                          * the correct current backlight level in most cases.
 516                          * ACPI video backlight still works w/ buggy _BQC.
 517                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 518                          */
 519                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 520                         device->cap._BQC = device->cap._BCQ = 0;
 521                 }
 522         }
 523
 524         *level = device->brightness->curr;
 525         return 0;
 526 }
 527
 528 static int
 529 acpi_video_device_EDID(struct acpi_video_device *device,
 530                        union acpi_object **edid, ssize_t length)
 531 {
 532         int status;
 533         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 534         union acpi_object *obj;
 535         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 536         struct acpi_object_list args = { 1, &arg0 };
 537
 538
 539         *edid = NULL;
 540
 541         if (!device)
 542                 return -ENODEV;
 543         if (length == 128)
 544                 arg0.integer.value = 1;
 545         else if (length == 256)
 546                 arg0.integer.value = 2;
 547         else
 548                 return -EINVAL;
 549
 550         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 551         if (ACPI_FAILURE(status))
 552                 return -ENODEV;
 553
 554         obj = buffer.pointer;
 555
 556         if (obj && obj->type == ACPI_TYPE_BUFFER)
 557                 *edid = obj;
 558         else {
 559                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 560                 status = -EFAULT;
 561                 kfree(obj);
 562         }
 563
 564         return status;
 565 }
 566
 567 /* bus */
 568
 569 /*
 570  *  Arg:
 571  *      video           : video bus device pointer
 572  *      bios_flag       :
 573  *              0.      The system BIOS should NOT automatically switch(toggle)
 574  *                      the active display output.
 575  *              1.      The system BIOS should automatically switch (toggle) the
 576  *                      active display output. No switch event.
 577  *              2.      The _DGS value should be locked.
 578  *              3.      The system BIOS should not automatically switch (toggle) the
 579  *                      active display output, but instead generate the display switch
 580  *                      event notify code.
 581  *      lcd_flag        :
 582  *              0.      The system BIOS should automatically control the brightness level
 583  *                      of the LCD when the power changes from AC to DC
 584  *              1.      The system BIOS should NOT automatically control the brightness
 585  *                      level of the LCD when the power changes from AC to DC.
 586  *  Return Value:
 587  *              -EINVAL wrong arg.
 588  */
 589
 590 static int
 591 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 592 {
 593         acpi_status status;
 594
 595         if (!video->cap._DOS)
 596                 return 0;
 597
 598         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 599                 return -EINVAL;
 600         video->dos_setting = (lcd_flag << 2) | bios_flag;
 601         status = acpi_execute_simple_method(video->device->handle, "_DOS",
 602                                             (lcd_flag << 2) | bios_flag);
 603         if (ACPI_FAILURE(status))
 604                 return -EIO;
 605
 606         return 0;
 607 }
 608
 609 /*
 610  * Simple comparison function used to sort backlight levels.
 611  */
 612
 613 static int
 614 acpi_video_cmp_level(const void *a, const void *b)
 615 {
 616         return *(int *)a - *(int *)b;
 617 }
 618
 619 /*
 620  * Decides if _BQC/_BCQ for this system is usable
 621  *
 622  * We do this by changing the level first and then read out the current
 623  * brightness level, if the value does not match, find out if it is using
 624  * index. If not, clear the _BQC/_BCQ capability.
 625  */
 626 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 627                                 int max_level, int current_level)
 628 {
 629         struct acpi_video_device_brightness *br = device->brightness;
 630         int result;
 631         unsigned long long level;
 632         int test_level;
 633
 634         /* don't mess with existing known broken systems */
 635         if (bqc_offset_aml_bug_workaround)
 636                 return 0;
 637
 638         /*
 639          * Some systems always report current brightness level as maximum
 640          * through _BQC, we need to test another value for them.
 641          */
 642         test_level = current_level == max_level ? br->levels[3] : max_level;
 643
 644         result = acpi_video_device_lcd_set_level(device, test_level);
 645         if (result)
 646                 return result;
 647
 648         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 649         if (result)
 650                 return result;
 651
 652         if (level != test_level) {
 653                 /* buggy _BQC found, need to find out if it uses index */
 654                 if (level < br->count) {
 655                         if (br->flags._BCL_reversed)
 656                                 level = br->count - 3 - level;
 657                         if (br->levels[level + 2] == test_level)
 658                                 br->flags._BQC_use_index = 1;
 659                 }
 660
 661                 if (!br->flags._BQC_use_index)
 662                         device->cap._BQC = device->cap._BCQ = 0;
 663         }
 664
 665         return 0;
 666 }
 667
 668
 669 /*
 670  *  Arg:
 671  *      device  : video output device (LCD, CRT, ..)
 672  *
 673  *  Return Value:
 674  *      Maximum brightness level
 675  *
 676  *  Allocate and initialize device->brightness.
 677  */
 678
 679 static int
 680 acpi_video_init_brightness(struct acpi_video_device *device)
 681 {
 682         union acpi_object *obj = NULL;
 683         int i, max_level = 0, count = 0, level_ac_battery = 0;
 684         unsigned long long level, level_old;
 685         union acpi_object *o;
 686         struct acpi_video_device_brightness *br = NULL;
 687         int result = -EINVAL;
 688
 689         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 690                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 691                                                 "LCD brightness level\n"));
 692                 goto out;
 693         }
 694
 695         if (obj->package.count < 2)
 696                 goto out;
 697
 698         br = kzalloc(sizeof(*br), GFP_KERNEL);
 699         if (!br) {
 700                 printk(KERN_ERR "can't allocate memory\n");
 701                 result = -ENOMEM;
 702                 goto out;
 703         }
 704
 705         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 706                                 GFP_KERNEL);
 707         if (!br->levels) {
 708                 result = -ENOMEM;
 709                 goto out_free;
 710         }
 711
 712         for (i = 0; i < obj->package.count; i++) {
 713                 o = (union acpi_object *)&obj->package.elements[i];
 714                 if (o->type != ACPI_TYPE_INTEGER) {
 715                         printk(KERN_ERR PREFIX "Invalid data\n");
 716                         continue;
 717                 }
 718                 br->levels[count] = (u32) o->integer.value;
 719
 720                 if (br->levels[count] > max_level)
 721                         max_level = br->levels[count];
 722                 count++;
 723         }
 724
 725         /*
 726          * some buggy BIOS don't export the levels
 727          * when machine is on AC/Battery in _BCL package.
 728          * In this case, the first two elements in _BCL packages
 729          * are also supported brightness levels that OS should take care of.
 730          */
 731         for (i = 2; i < count; i++) {
 732                 if (br->levels[i] == br->levels[0])
 733                         level_ac_battery++;
 734                 if (br->levels[i] == br->levels[1])
 735                         level_ac_battery++;
 736         }
 737
 738         if (level_ac_battery < 2) {
 739                 level_ac_battery = 2 - level_ac_battery;
 740                 br->flags._BCL_no_ac_battery_levels = 1;
 741                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 742                         br->levels[i] = br->levels[i - level_ac_battery];
 743                 count += level_ac_battery;
 744         } else if (level_ac_battery > 2)
 745                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 746
 747         /* Check if the _BCL package is in a reversed order */
 748         if (max_level == br->levels[2]) {
 749                 br->flags._BCL_reversed = 1;
 750                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 751                         acpi_video_cmp_level, NULL);
 752         } else if (max_level != br->levels[count - 1])
 753                 ACPI_ERROR((AE_INFO,
 754                             "Found unordered _BCL package"));
 755
 756         br->count = count;
 757         device->brightness = br;
 758
 759         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 760         br->curr = level = max_level;
 761
 762         if (!device->cap._BQC)
 763                 goto set_level;
 764
 765         result = acpi_video_device_lcd_get_level_current(device,
 766                                                          &level_old, true);
 767         if (result)
 768                 goto out_free_levels;
 769
 770         result = acpi_video_bqc_quirk(device, max_level, level_old);
 771         if (result)
 772                 goto out_free_levels;
 773         /*
 774          * cap._BQC may get cleared due to _BQC is found to be broken
 775          * in acpi_video_bqc_quirk, so check again here.
 776          */
 777         if (!device->cap._BQC)
 778                 goto set_level;
 779
 780         level = acpi_video_bqc_value_to_level(device, level_old);
 781         /*
 782          * On some buggy laptops, _BQC returns an uninitialized
 783          * value when invoked for the first time, i.e.
 784          * level_old is invalid (no matter whether it's a level
 785          * or an index). Set the backlight to max_level in this case.
 786          */
 787         for (i = 2; i < br->count; i++)
 788                 if (level == br->levels[i])
 789                         break;
 790         if (i == br->count || !level)
 791                 level = max_level;
 792
 793 set_level:
 794         result = acpi_video_device_lcd_set_level(device, level);
 795         if (result)
 796                 goto out_free_levels;
 797
 798         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 799                           "found %d brightness levels\n", count - 2));
 800         kfree(obj);
 801         return result;
 802
 803 out_free_levels:
 804         kfree(br->levels);
 805 out_free:
 806         kfree(br);
 807 out:
 808         device->brightness = NULL;
 809         kfree(obj);
 810         return result;
 811 }
 812
 813 /*
 814  *  Arg:
 815  *      device  : video output device (LCD, CRT, ..)
 816  *
 817  *  Return Value:
 818  *      None
 819  *
 820  *  Find out all required AML methods defined under the output
 821  *  device.
 822  */
 823
 824 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 825 {
 826         if (acpi_has_method(device->dev->handle, "_ADR"))
 827                 device->cap._ADR = 1;
 828         if (acpi_has_method(device->dev->handle, "_BCL"))
 829                 device->cap._BCL = 1;
 830         if (acpi_has_method(device->dev->handle, "_BCM"))
 831                 device->cap._BCM = 1;
 832         if (acpi_has_method(device->dev->handle, "_BQC")) {
 833                 device->cap._BQC = 1;
 834         } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
 835                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 836                 device->cap._BCQ = 1;
 837         }
 838
 839         if (acpi_has_method(device->dev->handle, "_DDC"))
 840                 device->cap._DDC = 1;
 841 }
 842
 843 /*
 844  *  Arg:
 845  *      device  : video output device (VGA)
 846  *
 847  *  Return Value:
 848  *      None
 849  *
 850  *  Find out all required AML methods defined under the video bus device.
 851  */
 852
 853 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 854 {
 855         if (acpi_has_method(video->device->handle, "_DOS"))
 856                 video->cap._DOS = 1;
 857         if (acpi_has_method(video->device->handle, "_DOD"))
 858                 video->cap._DOD = 1;
 859         if (acpi_has_method(video->device->handle, "_ROM"))
 860                 video->cap._ROM = 1;
 861         if (acpi_has_method(video->device->handle, "_GPD"))
 862                 video->cap._GPD = 1;
 863         if (acpi_has_method(video->device->handle, "_SPD"))
 864                 video->cap._SPD = 1;
 865         if (acpi_has_method(video->device->handle, "_VPO"))
 866                 video->cap._VPO = 1;
 867 }
 868
 869 /*
 870  * Check whether the video bus device has required AML method to
 871  * support the desired features
 872  */
 873
 874 static int acpi_video_bus_check(struct acpi_video_bus *video)
 875 {
 876         acpi_status status = -ENOENT;
 877         struct pci_dev *dev;
 878
 879         if (!video)
 880                 return -EINVAL;
 881
 882         dev = acpi_get_pci_dev(video->device->handle);
 883         if (!dev)
 884                 return -ENODEV;
 885         pci_dev_put(dev);
 886
 887         /*
 888          * Since there is no HID, CID and so on for VGA driver, we have
 889          * to check well known required nodes.
 890          */
 891
 892         /* Does this device support video switching? */
 893         if (video->cap._DOS || video->cap._DOD) {
 894                 if (!video->cap._DOS) {
 895                         printk(KERN_WARNING FW_BUG
 896                                 "ACPI(%s) defines _DOD but not _DOS\n",
 897                                 acpi_device_bid(video->device));
 898                 }
 899                 video->flags.multihead = 1;
 900                 status = 0;
 901         }
 902
 903         /* Does this device support retrieving a video ROM? */
 904         if (video->cap._ROM) {
 905                 video->flags.rom = 1;
 906                 status = 0;
 907         }
 908
 909         /* Does this device support configuring which video device to POST? */
 910         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
 911                 video->flags.post = 1;
 912                 status = 0;
 913         }
 914
 915         return status;
 916 }
 917
 918 /*
 919  * --------------------------------------------------------------------------
 920  *                               Driver Interface
 921  * --------------------------------------------------------------------------
 922  */
 923
 924 /* device interface */
 925 static struct acpi_video_device_attrib *
 926 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
 927 {
 928         struct acpi_video_enumerated_device *ids;
 929         int i;
 930
 931         for (i = 0; i < video->attached_count; i++) {
 932                 ids = &video->attached_array[i];
 933                 if ((ids->value.int_val & 0xffff) == device_id)
 934                         return &ids->value.attrib;
 935         }
 936
 937         return NULL;
 938 }
 939
 940 static int
 941 acpi_video_get_device_type(struct acpi_video_bus *video,
 942                            unsigned long device_id)
 943 {
 944         struct acpi_video_enumerated_device *ids;
 945         int i;
 946
 947         for (i = 0; i < video->attached_count; i++) {
 948                 ids = &video->attached_array[i];
 949                 if ((ids->value.int_val & 0xffff) == device_id)
 950                         return ids->value.int_val;
 951         }
 952
 953         return 0;
 954 }
 955
 956 static int
 957 acpi_video_bus_get_one_device(struct acpi_device *device,
 958                               struct acpi_video_bus *video)
 959 {
 960         unsigned long long device_id;
 961         int status, device_type;
 962         struct acpi_video_device *data;
 963         struct acpi_video_device_attrib *attribute;
 964
 965         status =
 966             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
 967         /* Some device omits _ADR, we skip them instead of fail */
 968         if (ACPI_FAILURE(status))
 969                 return 0;
 970
 971         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
 972         if (!data)
 973                 return -ENOMEM;
 974
 975         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
 976         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
 977         device->driver_data = data;
 978
 979         data->device_id = device_id;
 980         data->video = video;
 981         data->dev = device;
 982
 983         attribute = acpi_video_get_device_attr(video, device_id);
 984
 985         if (attribute && attribute->device_id_scheme) {
 986                 switch (attribute->display_type) {
 987                 case ACPI_VIDEO_DISPLAY_CRT:
 988                         data->flags.crt = 1;
 989                         break;
 990                 case ACPI_VIDEO_DISPLAY_TV:
 991                         data->flags.tvout = 1;
 992                         break;
 993                 case ACPI_VIDEO_DISPLAY_DVI:
 994                         data->flags.dvi = 1;
 995                         break;
 996                 case ACPI_VIDEO_DISPLAY_LCD:
 997                         data->flags.lcd = 1;
 998                         break;
 999                 default:
1000                         data->flags.unknown = 1;
1001                         break;
1002                 }
1003                 if (attribute->bios_can_detect)
1004                         data->flags.bios = 1;
1005         } else {
1006                 /* Check for legacy IDs */
1007                 device_type = acpi_video_get_device_type(video, device_id);
1008                 /* Ignore bits 16 and 18-20 */
1009                 switch (device_type & 0xffe2ffff) {
1010                 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1011                         data->flags.crt = 1;
1012                         break;
1013                 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1014                         data->flags.lcd = 1;
1015                         break;
1016                 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1017                         data->flags.tvout = 1;
1018                         break;
1019                 default:
1020                         data->flags.unknown = 1;
1021                 }
1022         }
1023
1024         acpi_video_device_bind(video, data);
1025         acpi_video_device_find_cap(data);
1026
1027         mutex_lock(&video->device_list_lock);
1028         list_add_tail(&data->entry, &video->video_device_list);
1029         mutex_unlock(&video->device_list_lock);
1030
1031         return status;
1032 }
1033
1034 /*
1035  *  Arg:
1036  *      video   : video bus device
1037  *
1038  *  Return:
1039  *      none
1040  *
1041  *  Enumerate the video device list of the video bus,
1042  *  bind the ids with the corresponding video devices
1043  *  under the video bus.
1044  */
1045
1046 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1047 {
1048         struct acpi_video_device *dev;
1049
1050         mutex_lock(&video->device_list_lock);
1051
1052         list_for_each_entry(dev, &video->video_device_list, entry)
1053                 acpi_video_device_bind(video, dev);
1054
1055         mutex_unlock(&video->device_list_lock);
1056 }
1057
1058 /*
1059  *  Arg:
1060  *      video   : video bus device
1061  *      device  : video output device under the video
1062  *              bus
1063  *
1064  *  Return:
1065  *      none
1066  *
1067  *  Bind the ids with the corresponding video devices
1068  *  under the video bus.
1069  */
1070
1071 static void
1072 acpi_video_device_bind(struct acpi_video_bus *video,
1073                        struct acpi_video_device *device)
1074 {
1075         struct acpi_video_enumerated_device *ids;
1076         int i;
1077
1078         for (i = 0; i < video->attached_count; i++) {
1079                 ids = &video->attached_array[i];
1080                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1081                         ids->bind_info = device;
1082                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1083                 }
1084         }
1085 }
1086
1087 /*
1088  *  Arg:
1089  *      video   : video bus device
1090  *
1091  *  Return:
1092  *      < 0     : error
1093  *
1094  *  Call _DOD to enumerate all devices attached to display adapter
1095  *
1096  */
1097
1098 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1099 {
1100         int status;
1101         int count;
1102         int i;
1103         struct acpi_video_enumerated_device *active_list;
1104         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1105         union acpi_object *dod = NULL;
1106         union acpi_object *obj;
1107
1108         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1109         if (!ACPI_SUCCESS(status)) {
1110                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1111                 return status;
1112         }
1113
1114         dod = buffer.pointer;
1115         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1116                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1117                 status = -EFAULT;
1118                 goto out;
1119         }
1120
1121         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1122                           dod->package.count));
1123
1124         active_list = kcalloc(1 + dod->package.count,
1125                               sizeof(struct acpi_video_enumerated_device),
1126                               GFP_KERNEL);
1127         if (!active_list) {
1128                 status = -ENOMEM;
1129                 goto out;
1130         }
1131
1132         count = 0;
1133         for (i = 0; i < dod->package.count; i++) {
1134                 obj = &dod->package.elements[i];
1135
1136                 if (obj->type != ACPI_TYPE_INTEGER) {
1137                         printk(KERN_ERR PREFIX
1138                                 "Invalid _DOD data in element %d\n", i);
1139                         continue;
1140                 }
1141
1142                 active_list[count].value.int_val = obj->integer.value;
1143                 active_list[count].bind_info = NULL;
1144                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1145                                   (int)obj->integer.value));
1146                 count++;
1147         }
1148
1149         kfree(video->attached_array);
1150
1151         video->attached_array = active_list;
1152         video->attached_count = count;
1153
1154 out:
1155         kfree(buffer.pointer);
1156         return status;
1157 }
1158
1159 static int
1160 acpi_video_get_next_level(struct acpi_video_device *device,
1161                           u32 level_current, u32 event)
1162 {
1163         int min, max, min_above, max_below, i, l, delta = 255;
1164         max = max_below = 0;
1165         min = min_above = 255;
1166         /* Find closest level to level_current */
1167         for (i = 2; i < device->brightness->count; i++) {
1168                 l = device->brightness->levels[i];
1169                 if (abs(l - level_current) < abs(delta)) {
1170                         delta = l - level_current;
1171                         if (!delta)
1172                                 break;
1173                 }
1174         }
1175         /* Ajust level_current to closest available level */
1176         level_current += delta;
1177         for (i = 2; i < device->brightness->count; i++) {
1178                 l = device->brightness->levels[i];
1179                 if (l < min)
1180                         min = l;
1181                 if (l > max)
1182                         max = l;
1183                 if (l < min_above && l > level_current)
1184                         min_above = l;
1185                 if (l > max_below && l < level_current)
1186                         max_below = l;
1187         }
1188
1189         switch (event) {
1190         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1191                 return (level_current < max) ? min_above : min;
1192         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1193                 return (level_current < max) ? min_above : max;
1194         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1195                 return (level_current > min) ? max_below : min;
1196         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1197         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1198                 return 0;
1199         default:
1200                 return level_current;
1201         }
1202 }
1203
1204 static int
1205 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1206 {
1207         unsigned long long level_current, level_next;
1208         int result = -EINVAL;
1209
1210         /* no warning message if acpi_backlight=vendor or a quirk is used */
1211         if (!acpi_video_verify_backlight_support())
1212                 return 0;
1213
1214         if (!device->brightness)
1215                 goto out;
1216
1217         result = acpi_video_device_lcd_get_level_current(device,
1218                                                          &level_current,
1219                                                          false);
1220         if (result)
1221                 goto out;
1222
1223         level_next = acpi_video_get_next_level(device, level_current, event);
1224
1225         result = acpi_video_device_lcd_set_level(device, level_next);
1226
1227         if (!result)
1228                 backlight_force_update(device->backlight,
1229                                        BACKLIGHT_UPDATE_HOTKEY);
1230
1231 out:
1232         if (result)
1233                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1234
1235         return result;
1236 }
1237
1238 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1239                         void **edid)
1240 {
1241         struct acpi_video_bus *video;
1242         struct acpi_video_device *video_device;
1243         union acpi_object *buffer = NULL;
1244         acpi_status status;
1245         int i, length;
1246
1247         if (!device || !acpi_driver_data(device))
1248                 return -EINVAL;
1249
1250         video = acpi_driver_data(device);
1251
1252         for (i = 0; i < video->attached_count; i++) {
1253                 video_device = video->attached_array[i].bind_info;
1254                 length = 256;
1255
1256                 if (!video_device)
1257                         continue;
1258
1259                 if (!video_device->cap._DDC)
1260                         continue;
1261
1262                 if (type) {
1263                         switch (type) {
1264                         case ACPI_VIDEO_DISPLAY_CRT:
1265                                 if (!video_device->flags.crt)
1266                                         continue;
1267                                 break;
1268                         case ACPI_VIDEO_DISPLAY_TV:
1269                                 if (!video_device->flags.tvout)
1270                                         continue;
1271                                 break;
1272                         case ACPI_VIDEO_DISPLAY_DVI:
1273                                 if (!video_device->flags.dvi)
1274                                         continue;
1275                                 break;
1276                         case ACPI_VIDEO_DISPLAY_LCD:
1277                                 if (!video_device->flags.lcd)
1278                                         continue;
1279                                 break;
1280                         }
1281                 } else if (video_device->device_id != device_id) {
1282                         continue;
1283                 }
1284
1285                 status = acpi_video_device_EDID(video_device, &buffer, length);
1286
1287                 if (ACPI_FAILURE(status) || !buffer ||
1288                     buffer->type != ACPI_TYPE_BUFFER) {
1289                         length = 128;
1290                         status = acpi_video_device_EDID(video_device, &buffer,
1291                                                         length);
1292                         if (ACPI_FAILURE(status) || !buffer ||
1293                             buffer->type != ACPI_TYPE_BUFFER) {
1294                                 continue;
1295                         }
1296                 }
1297
1298                 *edid = buffer->buffer.pointer;
1299                 return length;
1300         }
1301
1302         return -ENODEV;
1303 }
1304 EXPORT_SYMBOL(acpi_video_get_edid);
1305
1306 static int
1307 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1308                            struct acpi_device *device)
1309 {
1310         int status = 0;
1311         struct acpi_device *dev;
1312
1313         /*
1314          * There are systems where video module known to work fine regardless
1315          * of broken _DOD and ignoring returned value here doesn't cause
1316          * any issues later.
1317          */
1318         acpi_video_device_enumerate(video);
1319
1320         list_for_each_entry(dev, &device->children, node) {
1321
1322                 status = acpi_video_bus_get_one_device(dev, video);
1323                 if (status) {
1324                         dev_err(&dev->dev, "Can't attach device\n");
1325                         break;
1326                 }
1327         }
1328         return status;
1329 }
1330
1331 /* acpi_video interface */
1332
1333 /*
1334  * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1335  * preform any automatic brightness change on receiving a notification.
1336  */
1337 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1338 {
1339         return acpi_video_bus_DOS(video, 0,
1340                                   acpi_osi_is_win8() ? 1 : 0);
1341 }
1342
1343 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1344 {
1345         return acpi_video_bus_DOS(video, 0,
1346                                   acpi_osi_is_win8() ? 0 : 1);
1347 }
1348
1349 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1350 {
1351         struct acpi_video_bus *video = acpi_driver_data(device);
1352         struct input_dev *input;
1353         int keycode = 0;
1354
1355         if (!video || !video->input)
1356                 return;
1357
1358         input = video->input;
1359
1360         switch (event) {
1361         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1362                                          * most likely via hotkey. */
1363                 keycode = KEY_SWITCHVIDEOMODE;
1364                 break;
1365
1366         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1367                                          * connector. */
1368                 acpi_video_device_enumerate(video);
1369                 acpi_video_device_rebind(video);
1370                 keycode = KEY_SWITCHVIDEOMODE;
1371                 break;
1372
1373         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1374                 keycode = KEY_SWITCHVIDEOMODE;
1375                 break;
1376         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1377                 keycode = KEY_VIDEO_NEXT;
1378                 break;
1379         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1380                 keycode = KEY_VIDEO_PREV;
1381                 break;
1382
1383         default:
1384                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1385                                   "Unsupported event [0x%x]\n", event));
1386                 break;
1387         }
1388
1389         if (acpi_notifier_call_chain(device, event, 0))
1390                 /* Something vetoed the keypress. */
1391                 keycode = 0;
1392
1393         if (keycode) {
1394                 input_report_key(input, keycode, 1);
1395                 input_sync(input);
1396                 input_report_key(input, keycode, 0);
1397                 input_sync(input);
1398         }
1399
1400         return;
1401 }
1402
1403 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1404 {
1405         struct acpi_video_device *video_device = data;
1406         struct acpi_device *device = NULL;
1407         struct acpi_video_bus *bus;
1408         struct input_dev *input;
1409         int keycode = 0;
1410
1411         if (!video_device)
1412                 return;
1413
1414         device = video_device->dev;
1415         bus = video_device->video;
1416         input = bus->input;
1417
1418         switch (event) {
1419         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1420                 if (brightness_switch_enabled)
1421                         acpi_video_switch_brightness(video_device, event);
1422                 keycode = KEY_BRIGHTNESS_CYCLE;
1423                 break;
1424         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1425                 if (brightness_switch_enabled)
1426                         acpi_video_switch_brightness(video_device, event);
1427                 keycode = KEY_BRIGHTNESSUP;
1428                 break;
1429         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1430                 if (brightness_switch_enabled)
1431                         acpi_video_switch_brightness(video_device, event);
1432                 keycode = KEY_BRIGHTNESSDOWN;
1433                 break;
1434         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1435                 if (brightness_switch_enabled)
1436                         acpi_video_switch_brightness(video_device, event);
1437                 keycode = KEY_BRIGHTNESS_ZERO;
1438                 break;
1439         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1440                 if (brightness_switch_enabled)
1441                         acpi_video_switch_brightness(video_device, event);
1442                 keycode = KEY_DISPLAY_OFF;
1443                 break;
1444         default:
1445                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1446                                   "Unsupported event [0x%x]\n", event));
1447                 break;
1448         }
1449
1450         acpi_notifier_call_chain(device, event, 0);
1451
1452         if (keycode) {
1453                 input_report_key(input, keycode, 1);
1454                 input_sync(input);
1455                 input_report_key(input, keycode, 0);
1456                 input_sync(input);
1457         }
1458
1459         return;
1460 }
1461
1462 static int acpi_video_resume(struct notifier_block *nb,
1463                                 unsigned long val, void *ign)
1464 {
1465         struct acpi_video_bus *video;
1466         struct acpi_video_device *video_device;
1467         int i;
1468
1469         switch (val) {
1470         case PM_HIBERNATION_PREPARE:
1471         case PM_SUSPEND_PREPARE:
1472         case PM_RESTORE_PREPARE:
1473                 return NOTIFY_DONE;
1474         }
1475
1476         video = container_of(nb, struct acpi_video_bus, pm_nb);
1477
1478         dev_info(&video->device->dev, "Restoring backlight state\n");
1479
1480         for (i = 0; i < video->attached_count; i++) {
1481                 video_device = video->attached_array[i].bind_info;
1482                 if (video_device && video_device->backlight)
1483                         acpi_video_set_brightness(video_device->backlight);
1484         }
1485
1486         return NOTIFY_OK;
1487 }
1488
1489 static acpi_status
1490 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1491                         void **return_value)
1492 {
1493         struct acpi_device *device = context;
1494         struct acpi_device *sibling;
1495         int result;
1496
1497         if (handle == device->handle)
1498                 return AE_CTRL_TERMINATE;
1499
1500         result = acpi_bus_get_device(handle, &sibling);
1501         if (result)
1502                 return AE_OK;
1503
1504         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1505                         return AE_ALREADY_EXISTS;
1506
1507         return AE_OK;
1508 }
1509
1510 static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1511 {
1512         if (acpi_video_verify_backlight_support()) {
1513                 struct backlight_properties props;
1514                 struct pci_dev *pdev;
1515                 acpi_handle acpi_parent;
1516                 struct device *parent = NULL;
1517                 int result;
1518                 static int count;
1519                 char *name;
1520
1521                 result = acpi_video_init_brightness(device);
1522                 if (result)
1523                         return;
1524                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1525                 if (!name)
1526                         return;
1527                 count++;
1528
1529                 acpi_get_parent(device->dev->handle, &acpi_parent);
1530
1531                 pdev = acpi_get_pci_dev(acpi_parent);
1532                 if (pdev) {
1533                         parent = &pdev->dev;
1534                         pci_dev_put(pdev);
1535                 }
1536
1537                 memset(&props, 0, sizeof(struct backlight_properties));
1538                 props.type = BACKLIGHT_FIRMWARE;
1539                 props.max_brightness = device->brightness->count - 3;
1540                 device->backlight = backlight_device_register(name,
1541                                                               parent,
1542                                                               device,
1543                                                               &acpi_backlight_ops,
1544                                                               &props);
1545                 kfree(name);
1546                 if (IS_ERR(device->backlight))
1547                         return;
1548
1549                 /*
1550                  * Save current brightness level in case we have to restore it
1551                  * before acpi_video_device_lcd_set_level() is called next time.
1552                  */
1553                 device->backlight->props.brightness =
1554                                 acpi_video_get_brightness(device->backlight);
1555
1556                 device->cooling_dev = thermal_cooling_device_register("LCD",
1557                                         device->dev, &video_cooling_ops);
1558                 if (IS_ERR(device->cooling_dev)) {
1559                         /*
1560                          * Set cooling_dev to NULL so we don't crash trying to
1561                          * free it.
1562                          * Also, why the hell we are returning early and
1563                          * not attempt to register video output if cooling
1564                          * device registration failed?
1565                          * -- dtor
1566                          */
1567                         device->cooling_dev = NULL;
1568                         return;
1569                 }
1570
1571                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1572                          device->cooling_dev->id);
1573                 result = sysfs_create_link(&device->dev->dev.kobj,
1574                                 &device->cooling_dev->device.kobj,
1575                                 "thermal_cooling");
1576                 if (result)
1577                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1578                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1579                                 &device->dev->dev.kobj, "device");
1580                 if (result)
1581                         printk(KERN_ERR PREFIX "Create sysfs link\n");
1582         }
1583 }
1584
1585 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1586 {
1587         struct acpi_video_device *dev;
1588
1589         mutex_lock(&video->device_list_lock);
1590         list_for_each_entry(dev, &video->video_device_list, entry)
1591                 acpi_video_dev_register_backlight(dev);
1592         mutex_unlock(&video->device_list_lock);
1593
1594         video->pm_nb.notifier_call = acpi_video_resume;
1595         video->pm_nb.priority = 0;
1596         return register_pm_notifier(&video->pm_nb);
1597 }
1598
1599 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1600 {
1601         if (device->backlight) {
1602                 backlight_device_unregister(device->backlight);
1603                 device->backlight = NULL;
1604         }
1605         if (device->brightness) {
1606                 kfree(device->brightness->levels);
1607                 kfree(device->brightness);
1608                 device->brightness = NULL;
1609         }
1610         if (device->cooling_dev) {
1611                 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1612                 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1613                 thermal_cooling_device_unregister(device->cooling_dev);
1614                 device->cooling_dev = NULL;
1615         }
1616 }
1617
1618 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1619 {
1620         struct acpi_video_device *dev;
1621         int error = unregister_pm_notifier(&video->pm_nb);
1622
1623         mutex_lock(&video->device_list_lock);
1624         list_for_each_entry(dev, &video->video_device_list, entry)
1625                 acpi_video_dev_unregister_backlight(dev);
1626         mutex_unlock(&video->device_list_lock);
1627
1628         return error;
1629 }
1630
1631 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1632 {
1633         acpi_status status;
1634         struct acpi_device *adev = device->dev;
1635
1636         status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1637                                              acpi_video_device_notify, device);
1638         if (ACPI_FAILURE(status))
1639                 dev_err(&adev->dev, "Error installing notify handler\n");
1640         else
1641                 device->flags.notify = 1;
1642 }
1643
1644 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1645 {
1646         struct input_dev *input;
1647         struct acpi_video_device *dev;
1648         int error;
1649
1650         video->input = input = input_allocate_device();
1651         if (!input) {
1652                 error = -ENOMEM;
1653                 goto out;
1654         }
1655
1656         error = acpi_video_bus_start_devices(video);
1657         if (error)
1658                 goto err_free_input;
1659
1660         snprintf(video->phys, sizeof(video->phys),
1661                         "%s/video/input0", acpi_device_hid(video->device));
1662
1663         input->name = acpi_device_name(video->device);
1664         input->phys = video->phys;
1665         input->id.bustype = BUS_HOST;
1666         input->id.product = 0x06;
1667         input->dev.parent = &video->device->dev;
1668         input->evbit[0] = BIT(EV_KEY);
1669         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1670         set_bit(KEY_VIDEO_NEXT, input->keybit);
1671         set_bit(KEY_VIDEO_PREV, input->keybit);
1672         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1673         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1674         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1675         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1676         set_bit(KEY_DISPLAY_OFF, input->keybit);
1677
1678         error = input_register_device(input);
1679         if (error)
1680                 goto err_stop_dev;
1681
1682         mutex_lock(&video->device_list_lock);
1683         list_for_each_entry(dev, &video->video_device_list, entry)
1684                 acpi_video_dev_add_notify_handler(dev);
1685         mutex_unlock(&video->device_list_lock);
1686
1687         return 0;
1688
1689 err_stop_dev:
1690         acpi_video_bus_stop_devices(video);
1691 err_free_input:
1692         input_free_device(input);
1693         video->input = NULL;
1694 out:
1695         return error;
1696 }
1697
1698 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1699 {
1700         if (dev->flags.notify) {
1701                 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1702                                            acpi_video_device_notify);
1703                 dev->flags.notify = 0;
1704         }
1705 }
1706
1707 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1708 {
1709         struct acpi_video_device *dev;
1710
1711         mutex_lock(&video->device_list_lock);
1712         list_for_each_entry(dev, &video->video_device_list, entry)
1713                 acpi_video_dev_remove_notify_handler(dev);
1714         mutex_unlock(&video->device_list_lock);
1715
1716         acpi_video_bus_stop_devices(video);
1717         input_unregister_device(video->input);
1718         video->input = NULL;
1719 }
1720
1721 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1722 {
1723         struct acpi_video_device *dev, *next;
1724
1725         mutex_lock(&video->device_list_lock);
1726         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1727                 list_del(&dev->entry);
1728                 kfree(dev);
1729         }
1730         mutex_unlock(&video->device_list_lock);
1731
1732         return 0;
1733 }
1734
1735 static int instance;
1736
1737 static int acpi_video_bus_add(struct acpi_device *device)
1738 {
1739         struct acpi_video_bus *video;
1740         int error;
1741         acpi_status status;
1742
1743         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1744                                 device->parent->handle, 1,
1745                                 acpi_video_bus_match, NULL,
1746                                 device, NULL);
1747         if (status == AE_ALREADY_EXISTS) {
1748                 printk(KERN_WARNING FW_BUG
1749                         "Duplicate ACPI video bus devices for the"
1750                         " same VGA controller, please try module "
1751                         "parameter \"video.allow_duplicates=1\""
1752                         "if the current driver doesn't work.\n");
1753                 if (!allow_duplicates)
1754                         return -ENODEV;
1755         }
1756
1757         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1758         if (!video)
1759                 return -ENOMEM;
1760
1761         /* a hack to fix the duplicate name "VID" problem on T61 */
1762         if (!strcmp(device->pnp.bus_id, "VID")) {
1763                 if (instance)
1764                         device->pnp.bus_id[3] = '0' + instance;
1765                 instance++;
1766         }
1767         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1768         if (!strcmp(device->pnp.bus_id, "VGA")) {
1769                 if (instance)
1770                         device->pnp.bus_id[3] = '0' + instance;
1771                 instance++;
1772         }
1773
1774         video->device = device;
1775         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1776         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1777         device->driver_data = video;
1778
1779         acpi_video_bus_find_cap(video);
1780         error = acpi_video_bus_check(video);
1781         if (error)
1782                 goto err_free_video;
1783
1784         mutex_init(&video->device_list_lock);
1785         INIT_LIST_HEAD(&video->video_device_list);
1786
1787         error = acpi_video_bus_get_devices(video, device);
1788         if (error)
1789                 goto err_put_video;
1790
1791         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1792                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1793                video->flags.multihead ? "yes" : "no",
1794                video->flags.rom ? "yes" : "no",
1795                video->flags.post ? "yes" : "no");
1796         mutex_lock(&video_list_lock);
1797         list_add_tail(&video->entry, &video_bus_head);
1798         mutex_unlock(&video_list_lock);
1799
1800         acpi_video_bus_register_backlight(video);
1801         acpi_video_bus_add_notify_handler(video);
1802
1803         return 0;
1804
1805 err_put_video:
1806         acpi_video_bus_put_devices(video);
1807         kfree(video->attached_array);
1808 err_free_video:
1809         kfree(video);
1810         device->driver_data = NULL;
1811
1812         return error;
1813 }
1814
1815 static int acpi_video_bus_remove(struct acpi_device *device)
1816 {
1817         struct acpi_video_bus *video = NULL;
1818
1819
1820         if (!device || !acpi_driver_data(device))
1821                 return -EINVAL;
1822
1823         video = acpi_driver_data(device);
1824
1825         acpi_video_bus_remove_notify_handler(video);
1826         acpi_video_bus_unregister_backlight(video);
1827         acpi_video_bus_put_devices(video);
1828
1829         mutex_lock(&video_list_lock);
1830         list_del(&video->entry);
1831         mutex_unlock(&video_list_lock);
1832
1833         kfree(video->attached_array);
1834         kfree(video);
1835
1836         return 0;
1837 }
1838
1839 static int __init is_i740(struct pci_dev *dev)
1840 {
1841         if (dev->device == 0x00D1)
1842                 return 1;
1843         if (dev->device == 0x7000)
1844                 return 1;
1845         return 0;
1846 }
1847
1848 static int __init intel_opregion_present(void)
1849 {
1850         int opregion = 0;
1851         struct pci_dev *dev = NULL;
1852         u32 address;
1853
1854         for_each_pci_dev(dev) {
1855                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1856                         continue;
1857                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1858                         continue;
1859                 /* We don't want to poke around undefined i740 registers */
1860                 if (is_i740(dev))
1861                         continue;
1862                 pci_read_config_dword(dev, 0xfc, &address);
1863                 if (!address)
1864                         continue;
1865                 opregion = 1;
1866         }
1867         return opregion;
1868 }
1869
1870 int acpi_video_register(void)
1871 {
1872         int result = 0;
1873         if (register_count) {
1874                 /*
1875                  * if the function of acpi_video_register is already called,
1876                  * don't register the acpi_vide_bus again and return no error.
1877                  */
1878                 return 0;
1879         }
1880
1881         mutex_init(&video_list_lock);
1882         INIT_LIST_HEAD(&video_bus_head);
1883
1884         result = acpi_bus_register_driver(&acpi_video_bus);
1885         if (result < 0)
1886                 return -ENODEV;
1887
1888         /*
1889          * When the acpi_video_bus is loaded successfully, increase
1890          * the counter reference.
1891          */
1892         register_count = 1;
1893
1894         return 0;
1895 }
1896 EXPORT_SYMBOL(acpi_video_register);
1897
1898 void acpi_video_unregister(void)
1899 {
1900         if (!register_count) {
1901                 /*
1902                  * If the acpi video bus is already unloaded, don't
1903                  * unload it again and return directly.
1904                  */
1905                 return;
1906         }
1907         acpi_bus_unregister_driver(&acpi_video_bus);
1908
1909         register_count = 0;
1910
1911         return;
1912 }
1913 EXPORT_SYMBOL(acpi_video_unregister);
1914
1915 /*
1916  * This is kind of nasty. Hardware using Intel chipsets may require
1917  * the video opregion code to be run first in order to initialise
1918  * state before any ACPI video calls are made. To handle this we defer
1919  * registration of the video class until the opregion code has run.
1920  */
1921
1922 static int __init acpi_video_init(void)
1923 {
1924         dmi_check_system(video_dmi_table);
1925
1926         if (intel_opregion_present())
1927                 return 0;
1928
1929         return acpi_video_register();
1930 }
1931
1932 static void __exit acpi_video_exit(void)
1933 {
1934         acpi_video_unregister();
1935
1936         return;
1937 }
1938
1939 module_init(acpi_video_init);
1940 module_exit(acpi_video_exit);