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 <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 #include "internal.h"
  48
  49 #define PREFIX "ACPI: "
  50
  51 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  52 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  53 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  54 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  55 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  56 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  57 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  58
  59 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  60 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  61 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  62 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  63 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  64
  65 #define MAX_NAME_LEN    20
  66
  67 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  68 ACPI_MODULE_NAME("video");
  69
  70 MODULE_AUTHOR("Bruno Ducrot");
  71 MODULE_DESCRIPTION("ACPI Video Driver");
  72 MODULE_LICENSE("GPL");
  73
  74 static bool brightness_switch_enabled = 1;
  75 module_param(brightness_switch_enabled, bool, 0644);
  76
  77 /*
  78  * By default, we don't allow duplicate ACPI video bus devices
  79  * under the same VGA controller
  80  */
  81 static bool allow_duplicates;
  82 module_param(allow_duplicates, bool, 0644);
  83
  84 /*
  85  * Some BIOSes claim they use minimum backlight at boot,
  86  * and this may bring dimming screen after boot
  87  */
  88 static bool use_bios_initial_backlight = 1;
  89 module_param(use_bios_initial_backlight, bool, 0644);
  90
  91 static int register_count;
  92 static int acpi_video_bus_add(struct acpi_device *device);
  93 static int acpi_video_bus_remove(struct acpi_device *device);
  94 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  95
  96 static const struct acpi_device_id video_device_ids[] = {
  97         {ACPI_VIDEO_HID, 0},
  98         {"", 0},
  99 };
 100 MODULE_DEVICE_TABLE(acpi, video_device_ids);
 101
 102 static struct acpi_driver acpi_video_bus = {
 103         .name = "video",
 104         .class = ACPI_VIDEO_CLASS,
 105         .ids = video_device_ids,
 106         .ops = {
 107                 .add = acpi_video_bus_add,
 108                 .remove = acpi_video_bus_remove,
 109                 .notify = acpi_video_bus_notify,
 110                 },
 111 };
 112
 113 struct acpi_video_bus_flags {
 114         u8 multihead:1;         /* can switch video heads */
 115         u8 rom:1;               /* can retrieve a video rom */
 116         u8 post:1;              /* can configure the head to */
 117         u8 reserved:5;
 118 };
 119
 120 struct acpi_video_bus_cap {
 121         u8 _DOS:1;              /* Enable/Disable output switching */
 122         u8 _DOD:1;              /* Enumerate all devices attached to display adapter */
 123         u8 _ROM:1;              /* Get ROM Data */
 124         u8 _GPD:1;              /* Get POST Device */
 125         u8 _SPD:1;              /* Set POST Device */
 126         u8 _VPO:1;              /* Video POST Options */
 127         u8 reserved:2;
 128 };
 129
 130 struct acpi_video_device_attrib {
 131         u32 display_index:4;    /* A zero-based instance of the Display */
 132         u32 display_port_attachment:4;  /* This field differentiates the display type */
 133         u32 display_type:4;     /* Describe the specific type in use */
 134         u32 vendor_specific:4;  /* Chipset Vendor Specific */
 135         u32 bios_can_detect:1;  /* BIOS can detect the device */
 136         u32 depend_on_vga:1;    /* Non-VGA output device whose power is related to
 137                                    the VGA device. */
 138         u32 pipe_id:3;          /* For VGA multiple-head devices. */
 139         u32 reserved:10;        /* Must be 0 */
 140         u32 device_id_scheme:1; /* Device ID Scheme */
 141 };
 142
 143 struct acpi_video_enumerated_device {
 144         union {
 145                 u32 int_val;
 146                 struct acpi_video_device_attrib attrib;
 147         } value;
 148         struct acpi_video_device *bind_info;
 149 };
 150
 151 struct acpi_video_bus {
 152         struct acpi_device *device;
 153         u8 dos_setting;
 154         struct acpi_video_enumerated_device *attached_array;
 155         u8 attached_count;
 156         struct acpi_video_bus_cap cap;
 157         struct acpi_video_bus_flags flags;
 158         struct list_head video_device_list;
 159         struct mutex device_list_lock;  /* protects video_device_list */
 160         struct input_dev *input;
 161         char phys[32];  /* for input device */
 162         struct notifier_block pm_nb;
 163 };
 164
 165 struct acpi_video_device_flags {
 166         u8 crt:1;
 167         u8 lcd:1;
 168         u8 tvout:1;
 169         u8 dvi:1;
 170         u8 bios:1;
 171         u8 unknown:1;
 172         u8 notify:1;
 173         u8 reserved:1;
 174 };
 175
 176 struct acpi_video_device_cap {
 177         u8 _ADR:1;              /* Return the unique ID */
 178         u8 _BCL:1;              /* Query list of brightness control levels supported */
 179         u8 _BCM:1;              /* Set the brightness level */
 180         u8 _BQC:1;              /* Get current brightness level */
 181         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 182         u8 _DDC:1;              /* Return the EDID for this device */
 183 };
 184
 185 struct acpi_video_brightness_flags {
 186         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 187         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order */
 188         u8 _BQC_use_index:1;            /* _BQC returns an index value */
 189 };
 190
 191 struct acpi_video_device_brightness {
 192         int curr;
 193         int count;
 194         int *levels;
 195         struct acpi_video_brightness_flags flags;
 196 };
 197
 198 struct acpi_video_device {
 199         unsigned long device_id;
 200         struct acpi_video_device_flags flags;
 201         struct acpi_video_device_cap cap;
 202         struct list_head entry;
 203         struct acpi_video_bus *video;
 204         struct acpi_device *dev;
 205         struct acpi_video_device_brightness *brightness;
 206         struct backlight_device *backlight;
 207         struct thermal_cooling_device *cooling_dev;
 208 };
 209
 210 static const char device_decode[][30] = {
 211         "motherboard VGA device",
 212         "PCI VGA device",
 213         "AGP VGA device",
 214         "UNKNOWN",
 215 };
 216
 217 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 218 static void acpi_video_device_rebind(struct acpi_video_bus *video);
 219 static void acpi_video_device_bind(struct acpi_video_bus *video,
 220                                    struct acpi_video_device *device);
 221 static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 222 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 223                         int level);
 224 static int acpi_video_device_lcd_get_level_current(
 225                         struct acpi_video_device *device,
 226                         unsigned long long *level, bool raw);
 227 static int acpi_video_get_next_level(struct acpi_video_device *device,
 228                                      u32 level_current, u32 event);
 229 static int acpi_video_switch_brightness(struct acpi_video_device *device,
 230                                          int event);
 231
 232 /* backlight device sysfs support */
 233 static int acpi_video_get_brightness(struct backlight_device *bd)
 234 {
 235         unsigned long long cur_level;
 236         int i;
 237         struct acpi_video_device *vd = bl_get_data(bd);
 238
 239         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 240                 return -EINVAL;
 241         for (i = 2; i < vd->brightness->count; i++) {
 242                 if (vd->brightness->levels[i] == cur_level)
 243                         /*
 244                          * The first two entries are special - see page 575
 245                          * of the ACPI spec 3.0
 246                          */
 247                         return i - 2;
 248         }
 249         return 0;
 250 }
 251
 252 static int acpi_video_set_brightness(struct backlight_device *bd)
 253 {
 254         int request_level = bd->props.brightness + 2;
 255         struct acpi_video_device *vd = bl_get_data(bd);
 256
 257         return acpi_video_device_lcd_set_level(vd,
 258                                 vd->brightness->levels[request_level]);
 259 }
 260
 261 static const struct backlight_ops acpi_backlight_ops = {
 262         .get_brightness = acpi_video_get_brightness,
 263         .update_status  = acpi_video_set_brightness,
 264 };
 265
 266 /* thermal cooling device callbacks */
 267 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 268                                long *state)
 269 {
 270         struct acpi_device *device = cooling_dev->devdata;
 271         struct acpi_video_device *video = acpi_driver_data(device);
 272
 273         *state = video->brightness->count - 3;
 274         return 0;
 275 }
 276
 277 static int video_get_cur_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         unsigned long long level;
 283         int offset;
 284
 285         if (acpi_video_device_lcd_get_level_current(video, &level, false))
 286                 return -EINVAL;
 287         for (offset = 2; offset < video->brightness->count; offset++)
 288                 if (level == video->brightness->levels[offset]) {
 289                         *state = video->brightness->count - offset - 1;
 290                         return 0;
 291                 }
 292
 293         return -EINVAL;
 294 }
 295
 296 static int
 297 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 298 {
 299         struct acpi_device *device = cooling_dev->devdata;
 300         struct acpi_video_device *video = acpi_driver_data(device);
 301         int level;
 302
 303         if (state >= video->brightness->count - 2)
 304                 return -EINVAL;
 305
 306         state = video->brightness->count - state;
 307         level = video->brightness->levels[state - 1];
 308         return acpi_video_device_lcd_set_level(video, level);
 309 }
 310
 311 static const struct thermal_cooling_device_ops video_cooling_ops = {
 312         .get_max_state = video_get_max_state,
 313         .get_cur_state = video_get_cur_state,
 314         .set_cur_state = video_set_cur_state,
 315 };
 316
 317 /*
 318  * --------------------------------------------------------------------------
 319  *                             Video Management
 320  * --------------------------------------------------------------------------
 321  */
 322
 323 static int
 324 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 325                                    union acpi_object **levels)
 326 {
 327         int status;
 328         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 329         union acpi_object *obj;
 330
 331
 332         *levels = NULL;
 333
 334         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 335         if (!ACPI_SUCCESS(status))
 336                 return status;
 337         obj = (union acpi_object *)buffer.pointer;
 338         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 339                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 340                 status = -EFAULT;
 341                 goto err;
 342         }
 343
 344         *levels = obj;
 345
 346         return 0;
 347
 348 err:
 349         kfree(buffer.pointer);
 350
 351         return status;
 352 }
 353
 354 static int
 355 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 356 {
 357         int status;
 358         int state;
 359
 360         status = acpi_execute_simple_method(device->dev->handle,
 361                                             "_BCM", level);
 362         if (ACPI_FAILURE(status)) {
 363                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 364                 return -EIO;
 365         }
 366
 367         device->brightness->curr = level;
 368         for (state = 2; state < device->brightness->count; state++)
 369                 if (level == device->brightness->levels[state]) {
 370                         if (device->backlight)
 371                                 device->backlight->props.brightness = state - 2;
 372                         return 0;
 373                 }
 374
 375         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 376         return -EINVAL;
 377 }
 378
 379 /*
 380  * For some buggy _BQC methods, we need to add a constant value to
 381  * the _BQC return value to get the actual current brightness level
 382  */
 383
 384 static int bqc_offset_aml_bug_workaround;
 385 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 386 {
 387         bqc_offset_aml_bug_workaround = 9;
 388         return 0;
 389 }
 390
 391 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
 392 {
 393         use_bios_initial_backlight = 0;
 394         return 0;
 395 }
 396
 397 static struct dmi_system_id video_dmi_table[] __initdata = {
 398         /*
 399          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 400          */
 401         {
 402          .callback = video_set_bqc_offset,
 403          .ident = "Acer Aspire 5720",
 404          .matches = {
 405                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 406                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 407                 },
 408         },
 409         {
 410          .callback = video_set_bqc_offset,
 411          .ident = "Acer Aspire 5710Z",
 412          .matches = {
 413                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 414                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 415                 },
 416         },
 417         {
 418          .callback = video_set_bqc_offset,
 419          .ident = "eMachines E510",
 420          .matches = {
 421                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 422                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 423                 },
 424         },
 425         {
 426          .callback = video_set_bqc_offset,
 427          .ident = "Acer Aspire 5315",
 428          .matches = {
 429                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 430                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 431                 },
 432         },
 433         {
 434          .callback = video_set_bqc_offset,
 435          .ident = "Acer Aspire 7720",
 436          .matches = {
 437                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 438                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 439                 },
 440         },
 441         {
 442          .callback = video_ignore_initial_backlight,
 443          .ident = "HP Folio 13-2000",
 444          .matches = {
 445                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 446                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
 447                 },
 448         },
 449         {
 450          .callback = video_ignore_initial_backlight,
 451          .ident = "Fujitsu E753",
 452          .matches = {
 453                 DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
 454                 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
 455                 },
 456         },
 457         {
 458          .callback = video_ignore_initial_backlight,
 459          .ident = "HP Pavilion dm4",
 460          .matches = {
 461                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 462                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
 463                 },
 464         },
 465         {
 466          .callback = video_ignore_initial_backlight,
 467          .ident = "HP Pavilion g6 Notebook PC",
 468          .matches = {
 469                  DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 470                  DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 471                 },
 472         },
 473         {
 474          .callback = video_ignore_initial_backlight,
 475          .ident = "HP 1000 Notebook PC",
 476          .matches = {
 477                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 478                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
 479                 },
 480         },
 481         {
 482          .callback = video_ignore_initial_backlight,
 483          .ident = "HP Pavilion m4",
 484          .matches = {
 485                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 486                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
 487                 },
 488         },
 489         {}
 490 };
 491
 492 static unsigned long long
 493 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 494                               unsigned long long bqc_value)
 495 {
 496         unsigned long long level;
 497
 498         if (device->brightness->flags._BQC_use_index) {
 499                 /*
 500                  * _BQC returns an index that doesn't account for
 501                  * the first 2 items with special meaning, so we need
 502                  * to compensate for that by offsetting ourselves
 503                  */
 504                 if (device->brightness->flags._BCL_reversed)
 505                         bqc_value = device->brightness->count - 3 - bqc_value;
 506
 507                 level = device->brightness->levels[bqc_value + 2];
 508         } else {
 509                 level = bqc_value;
 510         }
 511
 512         level += bqc_offset_aml_bug_workaround;
 513
 514         return level;
 515 }
 516
 517 static int
 518 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 519                                         unsigned long long *level, bool raw)
 520 {
 521         acpi_status status = AE_OK;
 522         int i;
 523
 524         if (device->cap._BQC || device->cap._BCQ) {
 525                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 526
 527                 status = acpi_evaluate_integer(device->dev->handle, buf,
 528                                                 NULL, level);
 529                 if (ACPI_SUCCESS(status)) {
 530                         if (raw) {
 531                                 /*
 532                                  * Caller has indicated he wants the raw
 533                                  * value returned by _BQC, so don't furtherly
 534                                  * mess with the value.
 535                                  */
 536                                 return 0;
 537                         }
 538
 539                         *level = acpi_video_bqc_value_to_level(device, *level);
 540
 541                         for (i = 2; i < device->brightness->count; i++)
 542                                 if (device->brightness->levels[i] == *level) {
 543                                         device->brightness->curr = *level;
 544                                         return 0;
 545                                 }
 546                         /*
 547                          * BQC returned an invalid level.
 548                          * Stop using it.
 549                          */
 550                         ACPI_WARNING((AE_INFO,
 551                                       "%s returned an invalid level",
 552                                       buf));
 553                         device->cap._BQC = device->cap._BCQ = 0;
 554                 } else {
 555                         /*
 556                          * Fixme:
 557                          * should we return an error or ignore this failure?
 558                          * dev->brightness->curr is a cached value which stores
 559                          * the correct current backlight level in most cases.
 560                          * ACPI video backlight still works w/ buggy _BQC.
 561                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 562                          */
 563                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 564                         device->cap._BQC = device->cap._BCQ = 0;
 565                 }
 566         }
 567
 568         *level = device->brightness->curr;
 569         return 0;
 570 }
 571
 572 static int
 573 acpi_video_device_EDID(struct acpi_video_device *device,
 574                        union acpi_object **edid, ssize_t length)
 575 {
 576         int status;
 577         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 578         union acpi_object *obj;
 579         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 580         struct acpi_object_list args = { 1, &arg0 };
 581
 582
 583         *edid = NULL;
 584
 585         if (!device)
 586                 return -ENODEV;
 587         if (length == 128)
 588                 arg0.integer.value = 1;
 589         else if (length == 256)
 590                 arg0.integer.value = 2;
 591         else
 592                 return -EINVAL;
 593
 594         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 595         if (ACPI_FAILURE(status))
 596                 return -ENODEV;
 597
 598         obj = buffer.pointer;
 599
 600         if (obj && obj->type == ACPI_TYPE_BUFFER)
 601                 *edid = obj;
 602         else {
 603                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 604                 status = -EFAULT;
 605                 kfree(obj);
 606         }
 607
 608         return status;
 609 }
 610
 611 /* bus */
 612
 613 /*
 614  *  Arg:
 615  *      video           : video bus device pointer
 616  *      bios_flag       :
 617  *              0.      The system BIOS should NOT automatically switch(toggle)
 618  *                      the active display output.
 619  *              1.      The system BIOS should automatically switch (toggle) the
 620  *                      active display output. No switch event.
 621  *              2.      The _DGS value should be locked.
 622  *              3.      The system BIOS should not automatically switch (toggle) the
 623  *                      active display output, but instead generate the display switch
 624  *                      event notify code.
 625  *      lcd_flag        :
 626  *              0.      The system BIOS should automatically control the brightness level
 627  *                      of the LCD when the power changes from AC to DC
 628  *              1.      The system BIOS should NOT automatically control the brightness
 629  *                      level of the LCD when the power changes from AC to DC.
 630  *  Return Value:
 631  *              -EINVAL wrong arg.
 632  */
 633
 634 static int
 635 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 636 {
 637         acpi_status status;
 638
 639         if (!video->cap._DOS)
 640                 return 0;
 641
 642         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 643                 return -EINVAL;
 644         video->dos_setting = (lcd_flag << 2) | bios_flag;
 645         status = acpi_execute_simple_method(video->device->handle, "_DOS",
 646                                             (lcd_flag << 2) | bios_flag);
 647         if (ACPI_FAILURE(status))
 648                 return -EIO;
 649
 650         return 0;
 651 }
 652
 653 /*
 654  * Simple comparison function used to sort backlight levels.
 655  */
 656
 657 static int
 658 acpi_video_cmp_level(const void *a, const void *b)
 659 {
 660         return *(int *)a - *(int *)b;
 661 }
 662
 663 /*
 664  * Decides if _BQC/_BCQ for this system is usable
 665  *
 666  * We do this by changing the level first and then read out the current
 667  * brightness level, if the value does not match, find out if it is using
 668  * index. If not, clear the _BQC/_BCQ capability.
 669  */
 670 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 671                                 int max_level, int current_level)
 672 {
 673         struct acpi_video_device_brightness *br = device->brightness;
 674         int result;
 675         unsigned long long level;
 676         int test_level;
 677
 678         /* don't mess with existing known broken systems */
 679         if (bqc_offset_aml_bug_workaround)
 680                 return 0;
 681
 682         /*
 683          * Some systems always report current brightness level as maximum
 684          * through _BQC, we need to test another value for them.
 685          */
 686         test_level = current_level == max_level ? br->levels[3] : max_level;
 687
 688         result = acpi_video_device_lcd_set_level(device, test_level);
 689         if (result)
 690                 return result;
 691
 692         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 693         if (result)
 694                 return result;
 695
 696         if (level != test_level) {
 697                 /* buggy _BQC found, need to find out if it uses index */
 698                 if (level < br->count) {
 699                         if (br->flags._BCL_reversed)
 700                                 level = br->count - 3 - level;
 701                         if (br->levels[level + 2] == test_level)
 702                                 br->flags._BQC_use_index = 1;
 703                 }
 704
 705                 if (!br->flags._BQC_use_index)
 706                         device->cap._BQC = device->cap._BCQ = 0;
 707         }
 708
 709         return 0;
 710 }
 711
 712
 713 /*
 714  *  Arg:
 715  *      device  : video output device (LCD, CRT, ..)
 716  *
 717  *  Return Value:
 718  *      Maximum brightness level
 719  *
 720  *  Allocate and initialize device->brightness.
 721  */
 722
 723 static int
 724 acpi_video_init_brightness(struct acpi_video_device *device)
 725 {
 726         union acpi_object *obj = NULL;
 727         int i, max_level = 0, count = 0, level_ac_battery = 0;
 728         unsigned long long level, level_old;
 729         union acpi_object *o;
 730         struct acpi_video_device_brightness *br = NULL;
 731         int result = -EINVAL;
 732
 733         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 734                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 735                                                 "LCD brightness level\n"));
 736                 goto out;
 737         }
 738
 739         if (obj->package.count < 2)
 740                 goto out;
 741
 742         br = kzalloc(sizeof(*br), GFP_KERNEL);
 743         if (!br) {
 744                 printk(KERN_ERR "can't allocate memory\n");
 745                 result = -ENOMEM;
 746                 goto out;
 747         }
 748
 749         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 750                                 GFP_KERNEL);
 751         if (!br->levels) {
 752                 result = -ENOMEM;
 753                 goto out_free;
 754         }
 755
 756         for (i = 0; i < obj->package.count; i++) {
 757                 o = (union acpi_object *)&obj->package.elements[i];
 758                 if (o->type != ACPI_TYPE_INTEGER) {
 759                         printk(KERN_ERR PREFIX "Invalid data\n");
 760                         continue;
 761                 }
 762                 br->levels[count] = (u32) o->integer.value;
 763
 764                 if (br->levels[count] > max_level)
 765                         max_level = br->levels[count];
 766                 count++;
 767         }
 768
 769         /*
 770          * some buggy BIOS don't export the levels
 771          * when machine is on AC/Battery in _BCL package.
 772          * In this case, the first two elements in _BCL packages
 773          * are also supported brightness levels that OS should take care of.
 774          */
 775         for (i = 2; i < count; i++) {
 776                 if (br->levels[i] == br->levels[0])
 777                         level_ac_battery++;
 778                 if (br->levels[i] == br->levels[1])
 779                         level_ac_battery++;
 780         }
 781
 782         if (level_ac_battery < 2) {
 783                 level_ac_battery = 2 - level_ac_battery;
 784                 br->flags._BCL_no_ac_battery_levels = 1;
 785                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 786                         br->levels[i] = br->levels[i - level_ac_battery];
 787                 count += level_ac_battery;
 788         } else if (level_ac_battery > 2)
 789                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 790
 791         /* Check if the _BCL package is in a reversed order */
 792         if (max_level == br->levels[2]) {
 793                 br->flags._BCL_reversed = 1;
 794                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 795                         acpi_video_cmp_level, NULL);
 796         } else if (max_level != br->levels[count - 1])
 797                 ACPI_ERROR((AE_INFO,
 798                             "Found unordered _BCL package"));
 799
 800         br->count = count;
 801         device->brightness = br;
 802
 803         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 804         br->curr = level = max_level;
 805
 806         if (!device->cap._BQC)
 807                 goto set_level;
 808
 809         result = acpi_video_device_lcd_get_level_current(device,
 810                                                          &level_old, true);
 811         if (result)
 812                 goto out_free_levels;
 813
 814         result = acpi_video_bqc_quirk(device, max_level, level_old);
 815         if (result)
 816                 goto out_free_levels;
 817         /*
 818          * cap._BQC may get cleared due to _BQC is found to be broken
 819          * in acpi_video_bqc_quirk, so check again here.
 820          */
 821         if (!device->cap._BQC)
 822                 goto set_level;
 823
 824         if (use_bios_initial_backlight) {
 825                 level = acpi_video_bqc_value_to_level(device, level_old);
 826                 /*
 827                  * On some buggy laptops, _BQC returns an uninitialized
 828                  * value when invoked for the first time, i.e.
 829                  * level_old is invalid (no matter whether it's a level
 830                  * or an index). Set the backlight to max_level in this case.
 831                  */
 832                 for (i = 2; i < br->count; i++)
 833                         if (level_old == br->levels[i])
 834                                 break;
 835                 if (i == br->count)
 836                         level = max_level;
 837         }
 838
 839 set_level:
 840         result = acpi_video_device_lcd_set_level(device, level);
 841         if (result)
 842                 goto out_free_levels;
 843
 844         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 845                           "found %d brightness levels\n", count - 2));
 846         kfree(obj);
 847         return result;
 848
 849 out_free_levels:
 850         kfree(br->levels);
 851 out_free:
 852         kfree(br);
 853 out:
 854         device->brightness = NULL;
 855         kfree(obj);
 856         return result;
 857 }
 858
 859 /*
 860  *  Arg:
 861  *      device  : video output device (LCD, CRT, ..)
 862  *
 863  *  Return Value:
 864  *      None
 865  *
 866  *  Find out all required AML methods defined under the output
 867  *  device.
 868  */
 869
 870 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 871 {
 872         if (acpi_has_method(device->dev->handle, "_ADR"))
 873                 device->cap._ADR = 1;
 874         if (acpi_has_method(device->dev->handle, "_BCL"))
 875                 device->cap._BCL = 1;
 876         if (acpi_has_method(device->dev->handle, "_BCM"))
 877                 device->cap._BCM = 1;
 878         if (acpi_has_method(device->dev->handle, "_BQC")) {
 879                 device->cap._BQC = 1;
 880         } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
 881                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 882                 device->cap._BCQ = 1;
 883         }
 884
 885         if (acpi_has_method(device->dev->handle, "_DDC"))
 886                 device->cap._DDC = 1;
 887
 888         if (acpi_video_backlight_support()) {
 889                 struct backlight_properties props;
 890                 struct pci_dev *pdev;
 891                 acpi_handle acpi_parent;
 892                 struct device *parent = NULL;
 893                 int result;
 894                 static int count;
 895                 char *name;
 896
 897                 result = acpi_video_init_brightness(device);
 898                 if (result)
 899                         return;
 900                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 901                 if (!name)
 902                         return;
 903                 count++;
 904
 905                 acpi_get_parent(device->dev->handle, &acpi_parent);
 906
 907                 pdev = acpi_get_pci_dev(acpi_parent);
 908                 if (pdev) {
 909                         parent = &pdev->dev;
 910                         pci_dev_put(pdev);
 911                 }
 912
 913                 memset(&props, 0, sizeof(struct backlight_properties));
 914                 props.type = BACKLIGHT_FIRMWARE;
 915                 props.max_brightness = device->brightness->count - 3;
 916                 device->backlight = backlight_device_register(name,
 917                                                               parent,
 918                                                               device,
 919                                                               &acpi_backlight_ops,
 920                                                               &props);
 921                 kfree(name);
 922                 if (IS_ERR(device->backlight))
 923                         return;
 924
 925                 /*
 926                  * Save current brightness level in case we have to restore it
 927                  * before acpi_video_device_lcd_set_level() is called next time.
 928                  */
 929                 device->backlight->props.brightness =
 930                                 acpi_video_get_brightness(device->backlight);
 931
 932                 device->cooling_dev = thermal_cooling_device_register("LCD",
 933                                         device->dev, &video_cooling_ops);
 934                 if (IS_ERR(device->cooling_dev)) {
 935                         /*
 936                          * Set cooling_dev to NULL so we don't crash trying to
 937                          * free it.
 938                          * Also, why the hell we are returning early and
 939                          * not attempt to register video output if cooling
 940                          * device registration failed?
 941                          * -- dtor
 942                          */
 943                         device->cooling_dev = NULL;
 944                         return;
 945                 }
 946
 947                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 948                          device->cooling_dev->id);
 949                 result = sysfs_create_link(&device->dev->dev.kobj,
 950                                 &device->cooling_dev->device.kobj,
 951                                 "thermal_cooling");
 952                 if (result)
 953                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 954                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 955                                 &device->dev->dev.kobj, "device");
 956                 if (result)
 957                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 958
 959         }
 960 }
 961
 962 /*
 963  *  Arg:
 964  *      device  : video output device (VGA)
 965  *
 966  *  Return Value:
 967  *      None
 968  *
 969  *  Find out all required AML methods defined under the video bus device.
 970  */
 971
 972 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 973 {
 974         if (acpi_has_method(video->device->handle, "_DOS"))
 975                 video->cap._DOS = 1;
 976         if (acpi_has_method(video->device->handle, "_DOD"))
 977                 video->cap._DOD = 1;
 978         if (acpi_has_method(video->device->handle, "_ROM"))
 979                 video->cap._ROM = 1;
 980         if (acpi_has_method(video->device->handle, "_GPD"))
 981                 video->cap._GPD = 1;
 982         if (acpi_has_method(video->device->handle, "_SPD"))
 983                 video->cap._SPD = 1;
 984         if (acpi_has_method(video->device->handle, "_VPO"))
 985                 video->cap._VPO = 1;
 986 }
 987
 988 /*
 989  * Check whether the video bus device has required AML method to
 990  * support the desired features
 991  */
 992
 993 static int acpi_video_bus_check(struct acpi_video_bus *video)
 994 {
 995         acpi_status status = -ENOENT;
 996         struct pci_dev *dev;
 997
 998         if (!video)
 999                 return -EINVAL;
1000
1001         dev = acpi_get_pci_dev(video->device->handle);
1002         if (!dev)
1003                 return -ENODEV;
1004         pci_dev_put(dev);
1005
1006         /*
1007          * Since there is no HID, CID and so on for VGA driver, we have
1008          * to check well known required nodes.
1009          */
1010
1011         /* Does this device support video switching? */
1012         if (video->cap._DOS || video->cap._DOD) {
1013                 if (!video->cap._DOS) {
1014                         printk(KERN_WARNING FW_BUG
1015                                 "ACPI(%s) defines _DOD but not _DOS\n",
1016                                 acpi_device_bid(video->device));
1017                 }
1018                 video->flags.multihead = 1;
1019                 status = 0;
1020         }
1021
1022         /* Does this device support retrieving a video ROM? */
1023         if (video->cap._ROM) {
1024                 video->flags.rom = 1;
1025                 status = 0;
1026         }
1027
1028         /* Does this device support configuring which video device to POST? */
1029         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1030                 video->flags.post = 1;
1031                 status = 0;
1032         }
1033
1034         return status;
1035 }
1036
1037 /*
1038  * --------------------------------------------------------------------------
1039  *                               Driver Interface
1040  * --------------------------------------------------------------------------
1041  */
1042
1043 /* device interface */
1044 static struct acpi_video_device_attrib *
1045 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1046 {
1047         struct acpi_video_enumerated_device *ids;
1048         int i;
1049
1050         for (i = 0; i < video->attached_count; i++) {
1051                 ids = &video->attached_array[i];
1052                 if ((ids->value.int_val & 0xffff) == device_id)
1053                         return &ids->value.attrib;
1054         }
1055
1056         return NULL;
1057 }
1058
1059 static int
1060 acpi_video_get_device_type(struct acpi_video_bus *video,
1061                            unsigned long device_id)
1062 {
1063         struct acpi_video_enumerated_device *ids;
1064         int i;
1065
1066         for (i = 0; i < video->attached_count; i++) {
1067                 ids = &video->attached_array[i];
1068                 if ((ids->value.int_val & 0xffff) == device_id)
1069                         return ids->value.int_val;
1070         }
1071
1072         return 0;
1073 }
1074
1075 static int
1076 acpi_video_bus_get_one_device(struct acpi_device *device,
1077                               struct acpi_video_bus *video)
1078 {
1079         unsigned long long device_id;
1080         int status, device_type;
1081         struct acpi_video_device *data;
1082         struct acpi_video_device_attrib *attribute;
1083
1084         status =
1085             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1086         /* Some device omits _ADR, we skip them instead of fail */
1087         if (ACPI_FAILURE(status))
1088                 return 0;
1089
1090         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1091         if (!data)
1092                 return -ENOMEM;
1093
1094         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1095         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1096         device->driver_data = data;
1097
1098         data->device_id = device_id;
1099         data->video = video;
1100         data->dev = device;
1101
1102         attribute = acpi_video_get_device_attr(video, device_id);
1103
1104         if (attribute && attribute->device_id_scheme) {
1105                 switch (attribute->display_type) {
1106                 case ACPI_VIDEO_DISPLAY_CRT:
1107                         data->flags.crt = 1;
1108                         break;
1109                 case ACPI_VIDEO_DISPLAY_TV:
1110                         data->flags.tvout = 1;
1111                         break;
1112                 case ACPI_VIDEO_DISPLAY_DVI:
1113                         data->flags.dvi = 1;
1114                         break;
1115                 case ACPI_VIDEO_DISPLAY_LCD:
1116                         data->flags.lcd = 1;
1117                         break;
1118                 default:
1119                         data->flags.unknown = 1;
1120                         break;
1121                 }
1122                 if (attribute->bios_can_detect)
1123                         data->flags.bios = 1;
1124         } else {
1125                 /* Check for legacy IDs */
1126                 device_type = acpi_video_get_device_type(video, device_id);
1127                 /* Ignore bits 16 and 18-20 */
1128                 switch (device_type & 0xffe2ffff) {
1129                 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1130                         data->flags.crt = 1;
1131                         break;
1132                 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1133                         data->flags.lcd = 1;
1134                         break;
1135                 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1136                         data->flags.tvout = 1;
1137                         break;
1138                 default:
1139                         data->flags.unknown = 1;
1140                 }
1141         }
1142
1143         acpi_video_device_bind(video, data);
1144         acpi_video_device_find_cap(data);
1145
1146         status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1147                                              acpi_video_device_notify, data);
1148         if (ACPI_FAILURE(status))
1149                 dev_err(&device->dev, "Error installing notify handler\n");
1150         else
1151                 data->flags.notify = 1;
1152
1153         mutex_lock(&video->device_list_lock);
1154         list_add_tail(&data->entry, &video->video_device_list);
1155         mutex_unlock(&video->device_list_lock);
1156
1157         return status;
1158 }
1159
1160 /*
1161  *  Arg:
1162  *      video   : video bus device
1163  *
1164  *  Return:
1165  *      none
1166  *
1167  *  Enumerate the video device list of the video bus,
1168  *  bind the ids with the corresponding video devices
1169  *  under the video bus.
1170  */
1171
1172 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1173 {
1174         struct acpi_video_device *dev;
1175
1176         mutex_lock(&video->device_list_lock);
1177
1178         list_for_each_entry(dev, &video->video_device_list, entry)
1179                 acpi_video_device_bind(video, dev);
1180
1181         mutex_unlock(&video->device_list_lock);
1182 }
1183
1184 /*
1185  *  Arg:
1186  *      video   : video bus device
1187  *      device  : video output device under the video
1188  *              bus
1189  *
1190  *  Return:
1191  *      none
1192  *
1193  *  Bind the ids with the corresponding video devices
1194  *  under the video bus.
1195  */
1196
1197 static void
1198 acpi_video_device_bind(struct acpi_video_bus *video,
1199                        struct acpi_video_device *device)
1200 {
1201         struct acpi_video_enumerated_device *ids;
1202         int i;
1203
1204         for (i = 0; i < video->attached_count; i++) {
1205                 ids = &video->attached_array[i];
1206                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1207                         ids->bind_info = device;
1208                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1209                 }
1210         }
1211 }
1212
1213 /*
1214  *  Arg:
1215  *      video   : video bus device
1216  *
1217  *  Return:
1218  *      < 0     : error
1219  *
1220  *  Call _DOD to enumerate all devices attached to display adapter
1221  *
1222  */
1223
1224 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1225 {
1226         int status;
1227         int count;
1228         int i;
1229         struct acpi_video_enumerated_device *active_list;
1230         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1231         union acpi_object *dod = NULL;
1232         union acpi_object *obj;
1233
1234         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1235         if (!ACPI_SUCCESS(status)) {
1236                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1237                 return status;
1238         }
1239
1240         dod = buffer.pointer;
1241         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1242                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1243                 status = -EFAULT;
1244                 goto out;
1245         }
1246
1247         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1248                           dod->package.count));
1249
1250         active_list = kcalloc(1 + dod->package.count,
1251                               sizeof(struct acpi_video_enumerated_device),
1252                               GFP_KERNEL);
1253         if (!active_list) {
1254                 status = -ENOMEM;
1255                 goto out;
1256         }
1257
1258         count = 0;
1259         for (i = 0; i < dod->package.count; i++) {
1260                 obj = &dod->package.elements[i];
1261
1262                 if (obj->type != ACPI_TYPE_INTEGER) {
1263                         printk(KERN_ERR PREFIX
1264                                 "Invalid _DOD data in element %d\n", i);
1265                         continue;
1266                 }
1267
1268                 active_list[count].value.int_val = obj->integer.value;
1269                 active_list[count].bind_info = NULL;
1270                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1271                                   (int)obj->integer.value));
1272                 count++;
1273         }
1274
1275         kfree(video->attached_array);
1276
1277         video->attached_array = active_list;
1278         video->attached_count = count;
1279
1280 out:
1281         kfree(buffer.pointer);
1282         return status;
1283 }
1284
1285 static int
1286 acpi_video_get_next_level(struct acpi_video_device *device,
1287                           u32 level_current, u32 event)
1288 {
1289         int min, max, min_above, max_below, i, l, delta = 255;
1290         max = max_below = 0;
1291         min = min_above = 255;
1292         /* Find closest level to level_current */
1293         for (i = 2; i < device->brightness->count; i++) {
1294                 l = device->brightness->levels[i];
1295                 if (abs(l - level_current) < abs(delta)) {
1296                         delta = l - level_current;
1297                         if (!delta)
1298                                 break;
1299                 }
1300         }
1301         /* Ajust level_current to closest available level */
1302         level_current += delta;
1303         for (i = 2; i < device->brightness->count; i++) {
1304                 l = device->brightness->levels[i];
1305                 if (l < min)
1306                         min = l;
1307                 if (l > max)
1308                         max = l;
1309                 if (l < min_above && l > level_current)
1310                         min_above = l;
1311                 if (l > max_below && l < level_current)
1312                         max_below = l;
1313         }
1314
1315         switch (event) {
1316         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1317                 return (level_current < max) ? min_above : min;
1318         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1319                 return (level_current < max) ? min_above : max;
1320         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1321                 return (level_current > min) ? max_below : min;
1322         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1323         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1324                 return 0;
1325         default:
1326                 return level_current;
1327         }
1328 }
1329
1330 static int
1331 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1332 {
1333         unsigned long long level_current, level_next;
1334         int result = -EINVAL;
1335
1336         /* no warning message if acpi_backlight=vendor is used */
1337         if (!acpi_video_backlight_support())
1338                 return 0;
1339
1340         if (!device->brightness)
1341                 goto out;
1342
1343         result = acpi_video_device_lcd_get_level_current(device,
1344                                                          &level_current,
1345                                                          false);
1346         if (result)
1347                 goto out;
1348
1349         level_next = acpi_video_get_next_level(device, level_current, event);
1350
1351         result = acpi_video_device_lcd_set_level(device, level_next);
1352
1353         if (!result)
1354                 backlight_force_update(device->backlight,
1355                                        BACKLIGHT_UPDATE_HOTKEY);
1356
1357 out:
1358         if (result)
1359                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1360
1361         return result;
1362 }
1363
1364 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1365                         void **edid)
1366 {
1367         struct acpi_video_bus *video;
1368         struct acpi_video_device *video_device;
1369         union acpi_object *buffer = NULL;
1370         acpi_status status;
1371         int i, length;
1372
1373         if (!device || !acpi_driver_data(device))
1374                 return -EINVAL;
1375
1376         video = acpi_driver_data(device);
1377
1378         for (i = 0; i < video->attached_count; i++) {
1379                 video_device = video->attached_array[i].bind_info;
1380                 length = 256;
1381
1382                 if (!video_device)
1383                         continue;
1384
1385                 if (!video_device->cap._DDC)
1386                         continue;
1387
1388                 if (type) {
1389                         switch (type) {
1390                         case ACPI_VIDEO_DISPLAY_CRT:
1391                                 if (!video_device->flags.crt)
1392                                         continue;
1393                                 break;
1394                         case ACPI_VIDEO_DISPLAY_TV:
1395                                 if (!video_device->flags.tvout)
1396                                         continue;
1397                                 break;
1398                         case ACPI_VIDEO_DISPLAY_DVI:
1399                                 if (!video_device->flags.dvi)
1400                                         continue;
1401                                 break;
1402                         case ACPI_VIDEO_DISPLAY_LCD:
1403                                 if (!video_device->flags.lcd)
1404                                         continue;
1405                                 break;
1406                         }
1407                 } else if (video_device->device_id != device_id) {
1408                         continue;
1409                 }
1410
1411                 status = acpi_video_device_EDID(video_device, &buffer, length);
1412
1413                 if (ACPI_FAILURE(status) || !buffer ||
1414                     buffer->type != ACPI_TYPE_BUFFER) {
1415                         length = 128;
1416                         status = acpi_video_device_EDID(video_device, &buffer,
1417                                                         length);
1418                         if (ACPI_FAILURE(status) || !buffer ||
1419                             buffer->type != ACPI_TYPE_BUFFER) {
1420                                 continue;
1421                         }
1422                 }
1423
1424                 *edid = buffer->buffer.pointer;
1425                 return length;
1426         }
1427
1428         return -ENODEV;
1429 }
1430 EXPORT_SYMBOL(acpi_video_get_edid);
1431
1432 static int
1433 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1434                            struct acpi_device *device)
1435 {
1436         int status = 0;
1437         struct acpi_device *dev;
1438
1439         /*
1440          * There are systems where video module known to work fine regardless
1441          * of broken _DOD and ignoring returned value here doesn't cause
1442          * any issues later.
1443          */
1444         acpi_video_device_enumerate(video);
1445
1446         list_for_each_entry(dev, &device->children, node) {
1447
1448                 status = acpi_video_bus_get_one_device(dev, video);
1449                 if (status) {
1450                         dev_err(&dev->dev, "Can't attach device\n");
1451                         break;
1452                 }
1453         }
1454         return status;
1455 }
1456
1457 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1458 {
1459         acpi_status status;
1460
1461         if (!device || !device->video)
1462                 return -ENOENT;
1463
1464         if (device->flags.notify) {
1465                 status = acpi_remove_notify_handler(device->dev->handle,
1466                                 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1467                 if (ACPI_FAILURE(status))
1468                         dev_err(&device->dev->dev,
1469                                         "Can't remove video notify handler\n");
1470         }
1471
1472         if (device->backlight) {
1473                 backlight_device_unregister(device->backlight);
1474                 device->backlight = NULL;
1475         }
1476         if (device->cooling_dev) {
1477                 sysfs_remove_link(&device->dev->dev.kobj,
1478                                   "thermal_cooling");
1479                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1480                                   "device");
1481                 thermal_cooling_device_unregister(device->cooling_dev);
1482                 device->cooling_dev = NULL;
1483         }
1484
1485         return 0;
1486 }
1487
1488 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1489 {
1490         int status;
1491         struct acpi_video_device *dev, *next;
1492
1493         mutex_lock(&video->device_list_lock);
1494
1495         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1496
1497                 status = acpi_video_bus_put_one_device(dev);
1498                 if (ACPI_FAILURE(status))
1499                         printk(KERN_WARNING PREFIX
1500                                "hhuuhhuu bug in acpi video driver.\n");
1501
1502                 if (dev->brightness) {
1503                         kfree(dev->brightness->levels);
1504                         kfree(dev->brightness);
1505                 }
1506                 list_del(&dev->entry);
1507                 kfree(dev);
1508         }
1509
1510         mutex_unlock(&video->device_list_lock);
1511
1512         return 0;
1513 }
1514
1515 /* acpi_video interface */
1516
1517 /*
1518  * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1519  * preform any automatic brightness change on receiving a notification.
1520  */
1521 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1522 {
1523         return acpi_video_bus_DOS(video, 0,
1524                                   acpi_video_backlight_quirks() ? 1 : 0);
1525 }
1526
1527 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1528 {
1529         return acpi_video_bus_DOS(video, 0,
1530                                   acpi_video_backlight_quirks() ? 0 : 1);
1531 }
1532
1533 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1534 {
1535         struct acpi_video_bus *video = acpi_driver_data(device);
1536         struct input_dev *input;
1537         int keycode = 0;
1538
1539         if (!video)
1540                 return;
1541
1542         input = video->input;
1543
1544         switch (event) {
1545         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1546                                          * most likely via hotkey. */
1547                 keycode = KEY_SWITCHVIDEOMODE;
1548                 break;
1549
1550         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1551                                          * connector. */
1552                 acpi_video_device_enumerate(video);
1553                 acpi_video_device_rebind(video);
1554                 keycode = KEY_SWITCHVIDEOMODE;
1555                 break;
1556
1557         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1558                 keycode = KEY_SWITCHVIDEOMODE;
1559                 break;
1560         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1561                 keycode = KEY_VIDEO_NEXT;
1562                 break;
1563         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1564                 keycode = KEY_VIDEO_PREV;
1565                 break;
1566
1567         default:
1568                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1569                                   "Unsupported event [0x%x]\n", event));
1570                 break;
1571         }
1572
1573         if (acpi_notifier_call_chain(device, event, 0))
1574                 /* Something vetoed the keypress. */
1575                 keycode = 0;
1576
1577         if (keycode) {
1578                 input_report_key(input, keycode, 1);
1579                 input_sync(input);
1580                 input_report_key(input, keycode, 0);
1581                 input_sync(input);
1582         }
1583
1584         return;
1585 }
1586
1587 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1588 {
1589         struct acpi_video_device *video_device = data;
1590         struct acpi_device *device = NULL;
1591         struct acpi_video_bus *bus;
1592         struct input_dev *input;
1593         int keycode = 0;
1594
1595         if (!video_device)
1596                 return;
1597
1598         device = video_device->dev;
1599         bus = video_device->video;
1600         input = bus->input;
1601
1602         switch (event) {
1603         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1604                 if (brightness_switch_enabled)
1605                         acpi_video_switch_brightness(video_device, event);
1606                 keycode = KEY_BRIGHTNESS_CYCLE;
1607                 break;
1608         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1609                 if (brightness_switch_enabled)
1610                         acpi_video_switch_brightness(video_device, event);
1611                 keycode = KEY_BRIGHTNESSUP;
1612                 break;
1613         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1614                 if (brightness_switch_enabled)
1615                         acpi_video_switch_brightness(video_device, event);
1616                 keycode = KEY_BRIGHTNESSDOWN;
1617                 break;
1618         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1619                 if (brightness_switch_enabled)
1620                         acpi_video_switch_brightness(video_device, event);
1621                 keycode = KEY_BRIGHTNESS_ZERO;
1622                 break;
1623         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1624                 if (brightness_switch_enabled)
1625                         acpi_video_switch_brightness(video_device, event);
1626                 keycode = KEY_DISPLAY_OFF;
1627                 break;
1628         default:
1629                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1630                                   "Unsupported event [0x%x]\n", event));
1631                 break;
1632         }
1633
1634         acpi_notifier_call_chain(device, event, 0);
1635
1636         if (keycode) {
1637                 input_report_key(input, keycode, 1);
1638                 input_sync(input);
1639                 input_report_key(input, keycode, 0);
1640                 input_sync(input);
1641         }
1642
1643         return;
1644 }
1645
1646 static int acpi_video_resume(struct notifier_block *nb,
1647                                 unsigned long val, void *ign)
1648 {
1649         struct acpi_video_bus *video;
1650         struct acpi_video_device *video_device;
1651         int i;
1652
1653         switch (val) {
1654         case PM_HIBERNATION_PREPARE:
1655         case PM_SUSPEND_PREPARE:
1656         case PM_RESTORE_PREPARE:
1657                 return NOTIFY_DONE;
1658         }
1659
1660         video = container_of(nb, struct acpi_video_bus, pm_nb);
1661
1662         dev_info(&video->device->dev, "Restoring backlight state\n");
1663
1664         for (i = 0; i < video->attached_count; i++) {
1665                 video_device = video->attached_array[i].bind_info;
1666                 if (video_device && video_device->backlight)
1667                         acpi_video_set_brightness(video_device->backlight);
1668         }
1669
1670         return NOTIFY_OK;
1671 }
1672
1673 static acpi_status
1674 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1675                         void **return_value)
1676 {
1677         struct acpi_device *device = context;
1678         struct acpi_device *sibling;
1679         int result;
1680
1681         if (handle == device->handle)
1682                 return AE_CTRL_TERMINATE;
1683
1684         result = acpi_bus_get_device(handle, &sibling);
1685         if (result)
1686                 return AE_OK;
1687
1688         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1689                         return AE_ALREADY_EXISTS;
1690
1691         return AE_OK;
1692 }
1693
1694 static int instance;
1695
1696 static int acpi_video_bus_add(struct acpi_device *device)
1697 {
1698         struct acpi_video_bus *video;
1699         struct input_dev *input;
1700         int error;
1701         acpi_status status;
1702
1703         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1704                                 device->parent->handle, 1,
1705                                 acpi_video_bus_match, NULL,
1706                                 device, NULL);
1707         if (status == AE_ALREADY_EXISTS) {
1708                 printk(KERN_WARNING FW_BUG
1709                         "Duplicate ACPI video bus devices for the"
1710                         " same VGA controller, please try module "
1711                         "parameter \"video.allow_duplicates=1\""
1712                         "if the current driver doesn't work.\n");
1713                 if (!allow_duplicates)
1714                         return -ENODEV;
1715         }
1716
1717         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1718         if (!video)
1719                 return -ENOMEM;
1720
1721         /* a hack to fix the duplicate name "VID" problem on T61 */
1722         if (!strcmp(device->pnp.bus_id, "VID")) {
1723                 if (instance)
1724                         device->pnp.bus_id[3] = '0' + instance;
1725                 instance++;
1726         }
1727         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1728         if (!strcmp(device->pnp.bus_id, "VGA")) {
1729                 if (instance)
1730                         device->pnp.bus_id[3] = '0' + instance;
1731                 instance++;
1732         }
1733
1734         video->device = device;
1735         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1736         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1737         device->driver_data = video;
1738
1739         acpi_video_bus_find_cap(video);
1740         error = acpi_video_bus_check(video);
1741         if (error)
1742                 goto err_free_video;
1743
1744         mutex_init(&video->device_list_lock);
1745         INIT_LIST_HEAD(&video->video_device_list);
1746
1747         error = acpi_video_bus_get_devices(video, device);
1748         if (error)
1749                 goto err_put_video;
1750
1751         video->input = input = input_allocate_device();
1752         if (!input) {
1753                 error = -ENOMEM;
1754                 goto err_put_video;
1755         }
1756
1757         error = acpi_video_bus_start_devices(video);
1758         if (error)
1759                 goto err_free_input_dev;
1760
1761         snprintf(video->phys, sizeof(video->phys),
1762                 "%s/video/input0", acpi_device_hid(video->device));
1763
1764         input->name = acpi_device_name(video->device);
1765         input->phys = video->phys;
1766         input->id.bustype = BUS_HOST;
1767         input->id.product = 0x06;
1768         input->dev.parent = &device->dev;
1769         input->evbit[0] = BIT(EV_KEY);
1770         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1771         set_bit(KEY_VIDEO_NEXT, input->keybit);
1772         set_bit(KEY_VIDEO_PREV, input->keybit);
1773         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1774         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1775         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1776         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1777         set_bit(KEY_DISPLAY_OFF, input->keybit);
1778
1779         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1780                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1781                video->flags.multihead ? "yes" : "no",
1782                video->flags.rom ? "yes" : "no",
1783                video->flags.post ? "yes" : "no");
1784
1785         video->pm_nb.notifier_call = acpi_video_resume;
1786         video->pm_nb.priority = 0;
1787         error = register_pm_notifier(&video->pm_nb);
1788         if (error)
1789                 goto err_stop_video;
1790
1791         error = input_register_device(input);
1792         if (error)
1793                 goto err_unregister_pm_notifier;
1794
1795         return 0;
1796
1797  err_unregister_pm_notifier:
1798         unregister_pm_notifier(&video->pm_nb);
1799  err_stop_video:
1800         acpi_video_bus_stop_devices(video);
1801  err_free_input_dev:
1802         input_free_device(input);
1803  err_put_video:
1804         acpi_video_bus_put_devices(video);
1805         kfree(video->attached_array);
1806  err_free_video:
1807         kfree(video);
1808         device->driver_data = NULL;
1809
1810         return error;
1811 }
1812
1813 static int acpi_video_bus_remove(struct acpi_device *device)
1814 {
1815         struct acpi_video_bus *video = NULL;
1816
1817
1818         if (!device || !acpi_driver_data(device))
1819                 return -EINVAL;
1820
1821         video = acpi_driver_data(device);
1822
1823         unregister_pm_notifier(&video->pm_nb);
1824
1825         acpi_video_bus_stop_devices(video);
1826         acpi_video_bus_put_devices(video);
1827
1828         input_unregister_device(video->input);
1829         kfree(video->attached_array);
1830         kfree(video);
1831
1832         return 0;
1833 }
1834
1835 static int __init is_i740(struct pci_dev *dev)
1836 {
1837         if (dev->device == 0x00D1)
1838                 return 1;
1839         if (dev->device == 0x7000)
1840                 return 1;
1841         return 0;
1842 }
1843
1844 static int __init intel_opregion_present(void)
1845 {
1846         int opregion = 0;
1847         struct pci_dev *dev = NULL;
1848         u32 address;
1849
1850         for_each_pci_dev(dev) {
1851                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1852                         continue;
1853                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1854                         continue;
1855                 /* We don't want to poke around undefined i740 registers */
1856                 if (is_i740(dev))
1857                         continue;
1858                 pci_read_config_dword(dev, 0xfc, &address);
1859                 if (!address)
1860                         continue;
1861                 opregion = 1;
1862         }
1863         return opregion;
1864 }
1865
1866 int acpi_video_register(void)
1867 {
1868         int result = 0;
1869         if (register_count) {
1870                 /*
1871                  * if the function of acpi_video_register is already called,
1872                  * don't register the acpi_vide_bus again and return no error.
1873                  */
1874                 return 0;
1875         }
1876
1877         result = acpi_bus_register_driver(&acpi_video_bus);
1878         if (result < 0)
1879                 return -ENODEV;
1880
1881         /*
1882          * When the acpi_video_bus is loaded successfully, increase
1883          * the counter reference.
1884          */
1885         register_count = 1;
1886
1887         return 0;
1888 }
1889 EXPORT_SYMBOL(acpi_video_register);
1890
1891 void acpi_video_unregister(void)
1892 {
1893         if (!register_count) {
1894                 /*
1895                  * If the acpi video bus is already unloaded, don't
1896                  * unload it again and return directly.
1897                  */
1898                 return;
1899         }
1900         acpi_bus_unregister_driver(&acpi_video_bus);
1901
1902         register_count = 0;
1903
1904         return;
1905 }
1906 EXPORT_SYMBOL(acpi_video_unregister);
1907
1908 /*
1909  * This is kind of nasty. Hardware using Intel chipsets may require
1910  * the video opregion code to be run first in order to initialise
1911  * state before any ACPI video calls are made. To handle this we defer
1912  * registration of the video class until the opregion code has run.
1913  */
1914
1915 static int __init acpi_video_init(void)
1916 {
1917         dmi_check_system(video_dmi_table);
1918
1919         if (intel_opregion_present())
1920                 return 0;
1921
1922         return acpi_video_register();
1923 }
1924
1925 static void __exit acpi_video_exit(void)
1926 {
1927         acpi_video_unregister();
1928
1929         return;
1930 }
1931
1932 module_init(acpi_video_init);
1933 module_exit(acpi_video_exit);