linux/drivers/acpi/video.c
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   1/*
   2 *  video.c - ACPI Video Driver ($Revision:$)
   3 *
   4 *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5 *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6 *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7 *
   8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9 *
  10 *  This program is free software; you can redistribute it and/or modify
  11 *  it under the terms of the GNU General Public License as published by
  12 *  the Free Software Foundation; either version 2 of the License, or (at
  13 *  your option) any later version.
  14 *
  15 *  This program is distributed in the hope that it will be useful, but
  16 *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 *  General Public License for more details.
  19 *
  20 *  You should have received a copy of the GNU General Public License along
  21 *  with this program; if not, write to the Free Software Foundation, Inc.,
  22 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23 *
  24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25 */
  26
  27#include <linux/kernel.h>
  28#include <linux/module.h>
  29#include <linux/init.h>
  30#include <linux/types.h>
  31#include <linux/list.h>
  32#include <linux/mutex.h>
  33#include <linux/input.h>
  34#include <linux/backlight.h>
  35#include <linux/thermal.h>
  36#include <linux/sort.h>
  37#include <linux/pci.h>
  38#include <linux/pci_ids.h>
  39#include <linux/slab.h>
  40#include <asm/uaccess.h>
  41#include <linux/dmi.h>
  42#include <acpi/acpi_bus.h>
  43#include <acpi/acpi_drivers.h>
  44#include <linux/suspend.h>
  45#include <acpi/video.h>
  46
  47#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
  68ACPI_MODULE_NAME("video");
  69
  70MODULE_AUTHOR("Bruno Ducrot");
  71MODULE_DESCRIPTION("ACPI Video Driver");
  72MODULE_LICENSE("GPL");
  73
  74static bool brightness_switch_enabled = 1;
  75module_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 */
  81static bool allow_duplicates;
  82module_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 */
  88static bool use_bios_initial_backlight = 1;
  89module_param(use_bios_initial_backlight, bool, 0644);
  90
  91static int register_count = 0;
  92static int acpi_video_bus_add(struct acpi_device *device);
  93static int acpi_video_bus_remove(struct acpi_device *device);
  94static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  95
  96static const struct acpi_device_id video_device_ids[] = {
  97        {ACPI_VIDEO_HID, 0},
  98        {"", 0},
  99};
 100MODULE_DEVICE_TABLE(acpi, video_device_ids);
 101
 102static 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
 113struct 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
 120struct 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
 130struct 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
 143struct 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
 151struct 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
 165struct 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
 176struct 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
 185struct 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 _BCL_use_index:1;            /* levels in _BCL are index values */
 189        u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 190        u8 _BQC_use_index:1;            /* _BQC returns an index value */
 191};
 192
 193struct acpi_video_device_brightness {
 194        int curr;
 195        int count;
 196        int *levels;
 197        struct acpi_video_brightness_flags flags;
 198};
 199
 200struct 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
 212static const char device_decode[][30] = {
 213        "motherboard VGA device",
 214        "PCI VGA device",
 215        "AGP VGA device",
 216        "UNKNOWN",
 217};
 218
 219static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
 220static void acpi_video_device_rebind(struct acpi_video_bus *video);
 221static void acpi_video_device_bind(struct acpi_video_bus *video,
 222                                   struct acpi_video_device *device);
 223static int acpi_video_device_enumerate(struct acpi_video_bus *video);
 224static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
 225                        int level);
 226static int acpi_video_device_lcd_get_level_current(
 227                        struct acpi_video_device *device,
 228                        unsigned long long *level, bool raw);
 229static int acpi_video_get_next_level(struct acpi_video_device *device,
 230                                     u32 level_current, u32 event);
 231static int acpi_video_switch_brightness(struct acpi_video_device *device,
 232                                         int event);
 233
 234/*backlight device sysfs support*/
 235static int acpi_video_get_brightness(struct backlight_device *bd)
 236{
 237        unsigned long long cur_level;
 238        int i;
 239        struct acpi_video_device *vd =
 240                (struct acpi_video_device *)bl_get_data(bd);
 241
 242        if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 243                return -EINVAL;
 244        for (i = 2; i < vd->brightness->count; i++) {
 245                if (vd->brightness->levels[i] == cur_level)
 246                        /* The first two entries are special - see page 575
 247                           of the ACPI spec 3.0 */
 248                        return i-2;
 249        }
 250        return 0;
 251}
 252
 253static int acpi_video_set_brightness(struct backlight_device *bd)
 254{
 255        int request_level = bd->props.brightness + 2;
 256        struct acpi_video_device *vd =
 257                (struct acpi_video_device *)bl_get_data(bd);
 258
 259        return acpi_video_device_lcd_set_level(vd,
 260                                vd->brightness->levels[request_level]);
 261}
 262
 263static const struct backlight_ops acpi_backlight_ops = {
 264        .get_brightness = acpi_video_get_brightness,
 265        .update_status  = acpi_video_set_brightness,
 266};
 267
 268/* thermal cooling device callbacks */
 269static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
 270                               long *state)
 271{
 272        struct acpi_device *device = cooling_dev->devdata;
 273        struct acpi_video_device *video = acpi_driver_data(device);
 274
 275        *state = video->brightness->count - 3;
 276        return 0;
 277}
 278
 279static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
 280                               long *state)
 281{
 282        struct acpi_device *device = cooling_dev->devdata;
 283        struct acpi_video_device *video = acpi_driver_data(device);
 284        unsigned long long level;
 285        int offset;
 286
 287        if (acpi_video_device_lcd_get_level_current(video, &level, false))
 288                return -EINVAL;
 289        for (offset = 2; offset < video->brightness->count; offset++)
 290                if (level == video->brightness->levels[offset]) {
 291                        *state = video->brightness->count - offset - 1;
 292                        return 0;
 293                }
 294
 295        return -EINVAL;
 296}
 297
 298static int
 299video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
 300{
 301        struct acpi_device *device = cooling_dev->devdata;
 302        struct acpi_video_device *video = acpi_driver_data(device);
 303        int level;
 304
 305        if ( state >= video->brightness->count - 2)
 306                return -EINVAL;
 307
 308        state = video->brightness->count - state;
 309        level = video->brightness->levels[state -1];
 310        return acpi_video_device_lcd_set_level(video, level);
 311}
 312
 313static const struct thermal_cooling_device_ops video_cooling_ops = {
 314        .get_max_state = video_get_max_state,
 315        .get_cur_state = video_get_cur_state,
 316        .set_cur_state = video_set_cur_state,
 317};
 318
 319/* --------------------------------------------------------------------------
 320                               Video Management
 321   -------------------------------------------------------------------------- */
 322
 323static int
 324acpi_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
 354static int
 355acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 356{
 357        int status;
 358        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 359        struct acpi_object_list args = { 1, &arg0 };
 360        int state;
 361
 362        arg0.integer.value = level;
 363
 364        status = acpi_evaluate_object(device->dev->handle, "_BCM",
 365                                      &args, NULL);
 366        if (ACPI_FAILURE(status)) {
 367                ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 368                return -EIO;
 369        }
 370
 371        device->brightness->curr = level;
 372        for (state = 2; state < device->brightness->count; state++)
 373                if (level == device->brightness->levels[state]) {
 374                        if (device->backlight)
 375                                device->backlight->props.brightness = state - 2;
 376                        return 0;
 377                }
 378
 379        ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 380        return -EINVAL;
 381}
 382
 383/*
 384 * For some buggy _BQC methods, we need to add a constant value to
 385 * the _BQC return value to get the actual current brightness level
 386 */
 387
 388static int bqc_offset_aml_bug_workaround;
 389static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 390{
 391        bqc_offset_aml_bug_workaround = 9;
 392        return 0;
 393}
 394
 395static int video_ignore_initial_backlight(const struct dmi_system_id *d)
 396{
 397        use_bios_initial_backlight = 0;
 398        return 0;
 399}
 400
 401static 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         .callback = video_ignore_initial_backlight,
 447         .ident = "HP Folio 13-2000",
 448         .matches = {
 449                DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 450                DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
 451                },
 452        },
 453        {
 454         .callback = video_ignore_initial_backlight,
 455         .ident = "Fujitsu E753",
 456         .matches = {
 457                DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"),
 458                DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"),
 459                },
 460        },
 461        {
 462         .callback = video_ignore_initial_backlight,
 463         .ident = "HP Pavilion dm4",
 464         .matches = {
 465                DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 466                DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
 467                },
 468        },
 469        {
 470         .callback = video_ignore_initial_backlight,
 471         .ident = "HP Pavilion g6 Notebook PC",
 472         .matches = {
 473                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 474                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 475                },
 476        },
 477        {
 478         .callback = video_ignore_initial_backlight,
 479         .ident = "HP 1000 Notebook PC",
 480         .matches = {
 481                DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 482                DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
 483                },
 484        },
 485        {
 486         .callback = video_ignore_initial_backlight,
 487         .ident = "HP Pavilion m4",
 488         .matches = {
 489                DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 490                DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
 491                },
 492        },
 493        {}
 494};
 495
 496static unsigned long long
 497acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 498                              unsigned long long bqc_value)
 499{
 500        unsigned long long level;
 501
 502        if (device->brightness->flags._BQC_use_index) {
 503                /*
 504                 * _BQC returns an index that doesn't account for
 505                 * the first 2 items with special meaning, so we need
 506                 * to compensate for that by offsetting ourselves
 507                 */
 508                if (device->brightness->flags._BCL_reversed)
 509                        bqc_value = device->brightness->count - 3 - bqc_value;
 510
 511                level = device->brightness->levels[bqc_value + 2];
 512        } else {
 513                level = bqc_value;
 514        }
 515
 516        level += bqc_offset_aml_bug_workaround;
 517
 518        return level;
 519}
 520
 521static int
 522acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 523                                        unsigned long long *level, bool raw)
 524{
 525        acpi_status status = AE_OK;
 526        int i;
 527
 528        if (device->cap._BQC || device->cap._BCQ) {
 529                char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 530
 531                status = acpi_evaluate_integer(device->dev->handle, buf,
 532                                                NULL, level);
 533                if (ACPI_SUCCESS(status)) {
 534                        if (raw) {
 535                                /*
 536                                 * Caller has indicated he wants the raw
 537                                 * value returned by _BQC, so don't furtherly
 538                                 * mess with the value.
 539                                 */
 540                                return 0;
 541                        }
 542
 543                        *level = acpi_video_bqc_value_to_level(device, *level);
 544
 545                        for (i = 2; i < device->brightness->count; i++)
 546                                if (device->brightness->levels[i] == *level) {
 547                                        device->brightness->curr = *level;
 548                                        return 0;
 549                        }
 550                        /*
 551                         * BQC returned an invalid level.
 552                         * Stop using it.
 553                         */
 554                        ACPI_WARNING((AE_INFO,
 555                                      "%s returned an invalid level",
 556                                      buf));
 557                        device->cap._BQC = device->cap._BCQ = 0;
 558                } else {
 559                        /* Fixme:
 560                         * should we return an error or ignore this failure?
 561                         * dev->brightness->curr is a cached value which stores
 562                         * the correct current backlight level in most cases.
 563                         * ACPI video backlight still works w/ buggy _BQC.
 564                         * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 565                         */
 566                        ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 567                        device->cap._BQC = device->cap._BCQ = 0;
 568                }
 569        }
 570
 571        *level = device->brightness->curr;
 572        return 0;
 573}
 574
 575static int
 576acpi_video_device_EDID(struct acpi_video_device *device,
 577                       union acpi_object **edid, ssize_t length)
 578{
 579        int status;
 580        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 581        union acpi_object *obj;
 582        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 583        struct acpi_object_list args = { 1, &arg0 };
 584
 585
 586        *edid = NULL;
 587
 588        if (!device)
 589                return -ENODEV;
 590        if (length == 128)
 591                arg0.integer.value = 1;
 592        else if (length == 256)
 593                arg0.integer.value = 2;
 594        else
 595                return -EINVAL;
 596
 597        status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 598        if (ACPI_FAILURE(status))
 599                return -ENODEV;
 600
 601        obj = buffer.pointer;
 602
 603        if (obj && obj->type == ACPI_TYPE_BUFFER)
 604                *edid = obj;
 605        else {
 606                printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 607                status = -EFAULT;
 608                kfree(obj);
 609        }
 610
 611        return status;
 612}
 613
 614/* bus */
 615
 616/*
 617 *  Arg:
 618 *      video           : video bus device pointer
 619 *      bios_flag       : 
 620 *              0.      The system BIOS should NOT automatically switch(toggle)
 621 *                      the active display output.
 622 *              1.      The system BIOS should automatically switch (toggle) the
 623 *                      active display output. No switch event.
 624 *              2.      The _DGS value should be locked.
 625 *              3.      The system BIOS should not automatically switch (toggle) the
 626 *                      active display output, but instead generate the display switch
 627 *                      event notify code.
 628 *      lcd_flag        :
 629 *              0.      The system BIOS should automatically control the brightness level
 630 *                      of the LCD when the power changes from AC to DC
 631 *              1.      The system BIOS should NOT automatically control the brightness 
 632 *                      level of the LCD when the power changes from AC to DC.
 633 * Return Value:
 634 *              -EINVAL wrong arg.
 635 */
 636
 637static int
 638acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 639{
 640        acpi_status status;
 641        union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 642        struct acpi_object_list args = { 1, &arg0 };
 643
 644        if (!video->cap._DOS)
 645                return 0;
 646
 647        if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 648                return -EINVAL;
 649        arg0.integer.value = (lcd_flag << 2) | bios_flag;
 650        video->dos_setting = arg0.integer.value;
 651        status = acpi_evaluate_object(video->device->handle, "_DOS",
 652                &args, NULL);
 653        if (ACPI_FAILURE(status))
 654                return -EIO;
 655
 656        return 0;
 657}
 658
 659/*
 660 * Simple comparison function used to sort backlight levels.
 661 */
 662
 663static int
 664acpi_video_cmp_level(const void *a, const void *b)
 665{
 666        return *(int *)a - *(int *)b;
 667}
 668
 669/*
 670 * Decides if _BQC/_BCQ for this system is usable
 671 *
 672 * We do this by changing the level first and then read out the current
 673 * brightness level, if the value does not match, find out if it is using
 674 * index. If not, clear the _BQC/_BCQ capability.
 675 */
 676static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 677                                int max_level, int current_level)
 678{
 679        struct acpi_video_device_brightness *br = device->brightness;
 680        int result;
 681        unsigned long long level;
 682        int test_level;
 683
 684        /* don't mess with existing known broken systems */
 685        if (bqc_offset_aml_bug_workaround)
 686                return 0;
 687
 688        /*
 689         * Some systems always report current brightness level as maximum
 690         * through _BQC, we need to test another value for them.
 691         */
 692        test_level = current_level == max_level ? br->levels[3] : max_level;
 693
 694        result = acpi_video_device_lcd_set_level(device, test_level);
 695        if (result)
 696                return result;
 697
 698        result = acpi_video_device_lcd_get_level_current(device, &level, true);
 699        if (result)
 700                return result;
 701
 702        if (level != test_level) {
 703                /* buggy _BQC found, need to find out if it uses index */
 704                if (level < br->count) {
 705                        if (br->flags._BCL_reversed)
 706                                level = br->count - 3 - level;
 707                        if (br->levels[level + 2] == test_level)
 708                                br->flags._BQC_use_index = 1;
 709                }
 710
 711                if (!br->flags._BQC_use_index)
 712                        device->cap._BQC = device->cap._BCQ = 0;
 713        }
 714
 715        return 0;
 716}
 717
 718
 719/*
 720 *  Arg:        
 721 *      device  : video output device (LCD, CRT, ..)
 722 *
 723 *  Return Value:
 724 *      Maximum brightness level
 725 *
 726 *  Allocate and initialize device->brightness.
 727 */
 728
 729static int
 730acpi_video_init_brightness(struct acpi_video_device *device)
 731{
 732        union acpi_object *obj = NULL;
 733        int i, max_level = 0, count = 0, level_ac_battery = 0;
 734        unsigned long long level, level_old;
 735        union acpi_object *o;
 736        struct acpi_video_device_brightness *br = NULL;
 737        int result = -EINVAL;
 738
 739        if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 740                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 741                                                "LCD brightness level\n"));
 742                goto out;
 743        }
 744
 745        if (obj->package.count < 2)
 746                goto out;
 747
 748        br = kzalloc(sizeof(*br), GFP_KERNEL);
 749        if (!br) {
 750                printk(KERN_ERR "can't allocate memory\n");
 751                result = -ENOMEM;
 752                goto out;
 753        }
 754
 755        br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 756                                GFP_KERNEL);
 757        if (!br->levels) {
 758                result = -ENOMEM;
 759                goto out_free;
 760        }
 761
 762        for (i = 0; i < obj->package.count; i++) {
 763                o = (union acpi_object *)&obj->package.elements[i];
 764                if (o->type != ACPI_TYPE_INTEGER) {
 765                        printk(KERN_ERR PREFIX "Invalid data\n");
 766                        continue;
 767                }
 768                br->levels[count] = (u32) o->integer.value;
 769
 770                if (br->levels[count] > max_level)
 771                        max_level = br->levels[count];
 772                count++;
 773        }
 774
 775        /*
 776         * some buggy BIOS don't export the levels
 777         * when machine is on AC/Battery in _BCL package.
 778         * In this case, the first two elements in _BCL packages
 779         * are also supported brightness levels that OS should take care of.
 780         */
 781        for (i = 2; i < count; i++) {
 782                if (br->levels[i] == br->levels[0])
 783                        level_ac_battery++;
 784                if (br->levels[i] == br->levels[1])
 785                        level_ac_battery++;
 786        }
 787
 788        if (level_ac_battery < 2) {
 789                level_ac_battery = 2 - level_ac_battery;
 790                br->flags._BCL_no_ac_battery_levels = 1;
 791                for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 792                        br->levels[i] = br->levels[i - level_ac_battery];
 793                count += level_ac_battery;
 794        } else if (level_ac_battery > 2)
 795                ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 796
 797        /* Check if the _BCL package is in a reversed order */
 798        if (max_level == br->levels[2]) {
 799                br->flags._BCL_reversed = 1;
 800                sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 801                        acpi_video_cmp_level, NULL);
 802        } else if (max_level != br->levels[count - 1])
 803                ACPI_ERROR((AE_INFO,
 804                            "Found unordered _BCL package"));
 805
 806        br->count = count;
 807        device->brightness = br;
 808
 809        /* Check the input/output of _BQC/_BCL/_BCM */
 810        if ((max_level < 100) && (max_level <= (count - 2)))
 811                br->flags._BCL_use_index = 1;
 812
 813        /*
 814         * _BCM is always consistent with _BCL,
 815         * at least for all the laptops we have ever seen.
 816         */
 817        br->flags._BCM_use_index = br->flags._BCL_use_index;
 818
 819        /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 820        br->curr = level = max_level;
 821
 822        if (!device->cap._BQC)
 823                goto set_level;
 824
 825        result = acpi_video_device_lcd_get_level_current(device,
 826                                                         &level_old, true);
 827        if (result)
 828                goto out_free_levels;
 829
 830        result = acpi_video_bqc_quirk(device, max_level, level_old);
 831        if (result)
 832                goto out_free_levels;
 833        /*
 834         * cap._BQC may get cleared due to _BQC is found to be broken
 835         * in acpi_video_bqc_quirk, so check again here.
 836         */
 837        if (!device->cap._BQC)
 838                goto set_level;
 839
 840        if (use_bios_initial_backlight) {
 841                level = acpi_video_bqc_value_to_level(device, level_old);
 842                /*
 843                 * On some buggy laptops, _BQC returns an uninitialized
 844                 * value when invoked for the first time, i.e.
 845                 * level_old is invalid (no matter whether it's a level
 846                 * or an index). Set the backlight to max_level in this case.
 847                 */
 848                for (i = 2; i < br->count; i++)
 849                        if (level_old == br->levels[i])
 850                                break;
 851                if (i == br->count)
 852                        level = max_level;
 853        }
 854
 855set_level:
 856        result = acpi_video_device_lcd_set_level(device, level);
 857        if (result)
 858                goto out_free_levels;
 859
 860        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 861                          "found %d brightness levels\n", count - 2));
 862        kfree(obj);
 863        return result;
 864
 865out_free_levels:
 866        kfree(br->levels);
 867out_free:
 868        kfree(br);
 869out:
 870        device->brightness = NULL;
 871        kfree(obj);
 872        return result;
 873}
 874
 875/*
 876 *  Arg:
 877 *      device  : video output device (LCD, CRT, ..)
 878 *
 879 *  Return Value:
 880 *      None
 881 *
 882 *  Find out all required AML methods defined under the output
 883 *  device.
 884 */
 885
 886static void acpi_video_device_find_cap(struct acpi_video_device *device)
 887{
 888        acpi_handle h_dummy1;
 889
 890        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 891                device->cap._ADR = 1;
 892        }
 893        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 894                device->cap._BCL = 1;
 895        }
 896        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 897                device->cap._BCM = 1;
 898        }
 899        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 900                device->cap._BQC = 1;
 901        else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 902                                &h_dummy1))) {
 903                printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 904                device->cap._BCQ = 1;
 905        }
 906
 907        if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 908                device->cap._DDC = 1;
 909        }
 910
 911        if (acpi_video_backlight_support()) {
 912                struct backlight_properties props;
 913                struct pci_dev *pdev;
 914                acpi_handle acpi_parent;
 915                struct device *parent = NULL;
 916                int result;
 917                static int count = 0;
 918                char *name;
 919
 920                result = acpi_video_init_brightness(device);
 921                if (result)
 922                        return;
 923                name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 924                if (!name)
 925                        return;
 926                count++;
 927
 928                acpi_get_parent(device->dev->handle, &acpi_parent);
 929
 930                pdev = acpi_get_pci_dev(acpi_parent);
 931                if (pdev) {
 932                        parent = &pdev->dev;
 933                        pci_dev_put(pdev);
 934                }
 935
 936                memset(&props, 0, sizeof(struct backlight_properties));
 937                props.type = BACKLIGHT_FIRMWARE;
 938                props.max_brightness = device->brightness->count - 3;
 939                device->backlight = backlight_device_register(name,
 940                                                              parent,
 941                                                              device,
 942                                                              &acpi_backlight_ops,
 943                                                              &props);
 944                kfree(name);
 945                if (IS_ERR(device->backlight))
 946                        return;
 947
 948                /*
 949                 * Save current brightness level in case we have to restore it
 950                 * before acpi_video_device_lcd_set_level() is called next time.
 951                 */
 952                device->backlight->props.brightness =
 953                                acpi_video_get_brightness(device->backlight);
 954
 955                device->cooling_dev = thermal_cooling_device_register("LCD",
 956                                        device->dev, &video_cooling_ops);
 957                if (IS_ERR(device->cooling_dev)) {
 958                        /*
 959                         * Set cooling_dev to NULL so we don't crash trying to
 960                         * free it.
 961                         * Also, why the hell we are returning early and
 962                         * not attempt to register video output if cooling
 963                         * device registration failed?
 964                         * -- dtor
 965                         */
 966                        device->cooling_dev = NULL;
 967                        return;
 968                }
 969
 970                dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 971                         device->cooling_dev->id);
 972                result = sysfs_create_link(&device->dev->dev.kobj,
 973                                &device->cooling_dev->device.kobj,
 974                                "thermal_cooling");
 975                if (result)
 976                        printk(KERN_ERR PREFIX "Create sysfs link\n");
 977                result = sysfs_create_link(&device->cooling_dev->device.kobj,
 978                                &device->dev->dev.kobj, "device");
 979                if (result)
 980                        printk(KERN_ERR PREFIX "Create sysfs link\n");
 981
 982        }
 983}
 984
 985/*
 986 *  Arg:        
 987 *      device  : video output device (VGA)
 988 *
 989 *  Return Value:
 990 *      None
 991 *
 992 *  Find out all required AML methods defined under the video bus device.
 993 */
 994
 995static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 996{
 997        acpi_handle h_dummy1;
 998
 999        if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
1000                video->cap._DOS = 1;
1001        }
1002        if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
1003                video->cap._DOD = 1;
1004        }
1005        if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
1006                video->cap._ROM = 1;
1007        }
1008        if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
1009                video->cap._GPD = 1;
1010        }
1011        if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1012                video->cap._SPD = 1;
1013        }
1014        if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1015                video->cap._VPO = 1;
1016        }
1017}
1018
1019/*
1020 * Check whether the video bus device has required AML method to
1021 * support the desired features
1022 */
1023
1024static int acpi_video_bus_check(struct acpi_video_bus *video)
1025{
1026        acpi_status status = -ENOENT;
1027        struct pci_dev *dev;
1028
1029        if (!video)
1030                return -EINVAL;
1031
1032        dev = acpi_get_pci_dev(video->device->handle);
1033        if (!dev)
1034                return -ENODEV;
1035        pci_dev_put(dev);
1036
1037        /* Since there is no HID, CID and so on for VGA driver, we have
1038         * to check well known required nodes.
1039         */
1040
1041        /* Does this device support video switching? */
1042        if (video->cap._DOS || video->cap._DOD) {
1043                if (!video->cap._DOS) {
1044                        printk(KERN_WARNING FW_BUG
1045                                "ACPI(%s) defines _DOD but not _DOS\n",
1046                                acpi_device_bid(video->device));
1047                }
1048                video->flags.multihead = 1;
1049                status = 0;
1050        }
1051
1052        /* Does this device support retrieving a video ROM? */
1053        if (video->cap._ROM) {
1054                video->flags.rom = 1;
1055                status = 0;
1056        }
1057
1058        /* Does this device support configuring which video device to POST? */
1059        if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1060                video->flags.post = 1;
1061                status = 0;
1062        }
1063
1064        return status;
1065}
1066
1067/* --------------------------------------------------------------------------
1068                                 Driver Interface
1069   -------------------------------------------------------------------------- */
1070
1071/* device interface */
1072static struct acpi_video_device_attrib*
1073acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
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 ((ids->value.int_val & 0xffff) == device_id)
1081                        return &ids->value.attrib;
1082        }
1083
1084        return NULL;
1085}
1086
1087static int
1088acpi_video_get_device_type(struct acpi_video_bus *video,
1089                           unsigned long device_id)
1090{
1091        struct acpi_video_enumerated_device *ids;
1092        int i;
1093
1094        for (i = 0; i < video->attached_count; i++) {
1095                ids = &video->attached_array[i];
1096                if ((ids->value.int_val & 0xffff) == device_id)
1097                        return ids->value.int_val;
1098        }
1099
1100        return 0;
1101}
1102
1103static int
1104acpi_video_bus_get_one_device(struct acpi_device *device,
1105                              struct acpi_video_bus *video)
1106{
1107        unsigned long long device_id;
1108        int status, device_type;
1109        struct acpi_video_device *data;
1110        struct acpi_video_device_attrib* attribute;
1111
1112        status =
1113            acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1114        /* Some device omits _ADR, we skip them instead of fail */
1115        if (ACPI_FAILURE(status))
1116                return 0;
1117
1118        data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1119        if (!data)
1120                return -ENOMEM;
1121
1122        strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1123        strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1124        device->driver_data = data;
1125
1126        data->device_id = device_id;
1127        data->video = video;
1128        data->dev = device;
1129
1130        attribute = acpi_video_get_device_attr(video, device_id);
1131
1132        if((attribute != NULL) && attribute->device_id_scheme) {
1133                switch (attribute->display_type) {
1134                case ACPI_VIDEO_DISPLAY_CRT:
1135                        data->flags.crt = 1;
1136                        break;
1137                case ACPI_VIDEO_DISPLAY_TV:
1138                        data->flags.tvout = 1;
1139                        break;
1140                case ACPI_VIDEO_DISPLAY_DVI:
1141                        data->flags.dvi = 1;
1142                        break;
1143                case ACPI_VIDEO_DISPLAY_LCD:
1144                        data->flags.lcd = 1;
1145                        break;
1146                default:
1147                        data->flags.unknown = 1;
1148                        break;
1149                }
1150                if(attribute->bios_can_detect)
1151                        data->flags.bios = 1;
1152        } else {
1153                /* Check for legacy IDs */
1154                device_type = acpi_video_get_device_type(video, device_id);
1155                /* Ignore bits 16 and 18-20 */
1156                switch (device_type & 0xffe2ffff) {
1157                        case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1158                                data->flags.crt = 1;
1159                                break;
1160                        case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1161                                data->flags.lcd = 1;
1162                                break;
1163                        case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1164                                data->flags.tvout = 1;
1165                                break;
1166                        default:
1167                                data->flags.unknown = 1;
1168                }
1169        }
1170
1171        acpi_video_device_bind(video, data);
1172        acpi_video_device_find_cap(data);
1173
1174        status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1175                                             acpi_video_device_notify, data);
1176        if (ACPI_FAILURE(status))
1177                dev_err(&device->dev, "Error installing notify handler\n");
1178        else
1179                data->flags.notify = 1;
1180
1181        mutex_lock(&video->device_list_lock);
1182        list_add_tail(&data->entry, &video->video_device_list);
1183        mutex_unlock(&video->device_list_lock);
1184
1185        return status;
1186}
1187
1188/*
1189 *  Arg:
1190 *      video   : video bus device 
1191 *
1192 *  Return:
1193 *      none
1194 *  
1195 *  Enumerate the video device list of the video bus, 
1196 *  bind the ids with the corresponding video devices
1197 *  under the video bus.
1198 */
1199
1200static void acpi_video_device_rebind(struct acpi_video_bus *video)
1201{
1202        struct acpi_video_device *dev;
1203
1204        mutex_lock(&video->device_list_lock);
1205
1206        list_for_each_entry(dev, &video->video_device_list, entry)
1207                acpi_video_device_bind(video, dev);
1208
1209        mutex_unlock(&video->device_list_lock);
1210}
1211
1212/*
1213 *  Arg:
1214 *      video   : video bus device 
1215 *      device  : video output device under the video 
1216 *              bus
1217 *
1218 *  Return:
1219 *      none
1220 *  
1221 *  Bind the ids with the corresponding video devices
1222 *  under the video bus.
1223 */
1224
1225static void
1226acpi_video_device_bind(struct acpi_video_bus *video,
1227                       struct acpi_video_device *device)
1228{
1229        struct acpi_video_enumerated_device *ids;
1230        int i;
1231
1232        for (i = 0; i < video->attached_count; i++) {
1233                ids = &video->attached_array[i];
1234                if (device->device_id == (ids->value.int_val & 0xffff)) {
1235                        ids->bind_info = device;
1236                        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1237                }
1238        }
1239}
1240
1241/*
1242 *  Arg:
1243 *      video   : video bus device 
1244 *
1245 *  Return:
1246 *      < 0     : error
1247 *  
1248 *  Call _DOD to enumerate all devices attached to display adapter
1249 *
1250 */
1251
1252static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1253{
1254        int status;
1255        int count;
1256        int i;
1257        struct acpi_video_enumerated_device *active_list;
1258        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1259        union acpi_object *dod = NULL;
1260        union acpi_object *obj;
1261
1262        status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1263        if (!ACPI_SUCCESS(status)) {
1264                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1265                return status;
1266        }
1267
1268        dod = buffer.pointer;
1269        if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1270                ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1271                status = -EFAULT;
1272                goto out;
1273        }
1274
1275        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1276                          dod->package.count));
1277
1278        active_list = kcalloc(1 + dod->package.count,
1279                              sizeof(struct acpi_video_enumerated_device),
1280                              GFP_KERNEL);
1281        if (!active_list) {
1282                status = -ENOMEM;
1283                goto out;
1284        }
1285
1286        count = 0;
1287        for (i = 0; i < dod->package.count; i++) {
1288                obj = &dod->package.elements[i];
1289
1290                if (obj->type != ACPI_TYPE_INTEGER) {
1291                        printk(KERN_ERR PREFIX
1292                                "Invalid _DOD data in element %d\n", i);
1293                        continue;
1294                }
1295
1296                active_list[count].value.int_val = obj->integer.value;
1297                active_list[count].bind_info = NULL;
1298                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1299                                  (int)obj->integer.value));
1300                count++;
1301        }
1302
1303        kfree(video->attached_array);
1304
1305        video->attached_array = active_list;
1306        video->attached_count = count;
1307
1308 out:
1309        kfree(buffer.pointer);
1310        return status;
1311}
1312
1313static int
1314acpi_video_get_next_level(struct acpi_video_device *device,
1315                          u32 level_current, u32 event)
1316{
1317        int min, max, min_above, max_below, i, l, delta = 255;
1318        max = max_below = 0;
1319        min = min_above = 255;
1320        /* Find closest level to level_current */
1321        for (i = 2; i < device->brightness->count; i++) {
1322                l = device->brightness->levels[i];
1323                if (abs(l - level_current) < abs(delta)) {
1324                        delta = l - level_current;
1325                        if (!delta)
1326                                break;
1327                }
1328        }
1329        /* Ajust level_current to closest available level */
1330        level_current += delta;
1331        for (i = 2; i < device->brightness->count; i++) {
1332                l = device->brightness->levels[i];
1333                if (l < min)
1334                        min = l;
1335                if (l > max)
1336                        max = l;
1337                if (l < min_above && l > level_current)
1338                        min_above = l;
1339                if (l > max_below && l < level_current)
1340                        max_below = l;
1341        }
1342
1343        switch (event) {
1344        case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1345                return (level_current < max) ? min_above : min;
1346        case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1347                return (level_current < max) ? min_above : max;
1348        case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1349                return (level_current > min) ? max_below : min;
1350        case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1351        case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1352                return 0;
1353        default:
1354                return level_current;
1355        }
1356}
1357
1358static int
1359acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1360{
1361        unsigned long long level_current, level_next;
1362        int result = -EINVAL;
1363
1364        /* no warning message if acpi_backlight=vendor is used */
1365        if (!acpi_video_backlight_support())
1366                return 0;
1367
1368        if (!device->brightness)
1369                goto out;
1370
1371        result = acpi_video_device_lcd_get_level_current(device,
1372                                                         &level_current,
1373                                                         false);
1374        if (result)
1375                goto out;
1376
1377        level_next = acpi_video_get_next_level(device, level_current, event);
1378
1379        result = acpi_video_device_lcd_set_level(device, level_next);
1380
1381        if (!result)
1382                backlight_force_update(device->backlight,
1383                                       BACKLIGHT_UPDATE_HOTKEY);
1384
1385out:
1386        if (result)
1387                printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1388
1389        return result;
1390}
1391
1392int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1393                        void **edid)
1394{
1395        struct acpi_video_bus *video;
1396        struct acpi_video_device *video_device;
1397        union acpi_object *buffer = NULL;
1398        acpi_status status;
1399        int i, length;
1400
1401        if (!device || !acpi_driver_data(device))
1402                return -EINVAL;
1403
1404        video = acpi_driver_data(device);
1405
1406        for (i = 0; i < video->attached_count; i++) {
1407                video_device = video->attached_array[i].bind_info;
1408                length = 256;
1409
1410                if (!video_device)
1411                        continue;
1412
1413                if (!video_device->cap._DDC)
1414                        continue;
1415
1416                if (type) {
1417                        switch (type) {
1418                        case ACPI_VIDEO_DISPLAY_CRT:
1419                                if (!video_device->flags.crt)
1420                                        continue;
1421                                break;
1422                        case ACPI_VIDEO_DISPLAY_TV:
1423                                if (!video_device->flags.tvout)
1424                                        continue;
1425                                break;
1426                        case ACPI_VIDEO_DISPLAY_DVI:
1427                                if (!video_device->flags.dvi)
1428                                        continue;
1429                                break;
1430                        case ACPI_VIDEO_DISPLAY_LCD:
1431                                if (!video_device->flags.lcd)
1432                                        continue;
1433                                break;
1434                        }
1435                } else if (video_device->device_id != device_id) {
1436                        continue;
1437                }
1438
1439                status = acpi_video_device_EDID(video_device, &buffer, length);
1440
1441                if (ACPI_FAILURE(status) || !buffer ||
1442                    buffer->type != ACPI_TYPE_BUFFER) {
1443                        length = 128;
1444                        status = acpi_video_device_EDID(video_device, &buffer,
1445                                                        length);
1446                        if (ACPI_FAILURE(status) || !buffer ||
1447                            buffer->type != ACPI_TYPE_BUFFER) {
1448                                continue;
1449                        }
1450                }
1451
1452                *edid = buffer->buffer.pointer;
1453                return length;
1454        }
1455
1456        return -ENODEV;
1457}
1458EXPORT_SYMBOL(acpi_video_get_edid);
1459
1460static int
1461acpi_video_bus_get_devices(struct acpi_video_bus *video,
1462                           struct acpi_device *device)
1463{
1464        int status = 0;
1465        struct acpi_device *dev;
1466
1467        /*
1468         * There are systems where video module known to work fine regardless
1469         * of broken _DOD and ignoring returned value here doesn't cause
1470         * any issues later.
1471         */
1472        acpi_video_device_enumerate(video);
1473
1474        list_for_each_entry(dev, &device->children, node) {
1475
1476                status = acpi_video_bus_get_one_device(dev, video);
1477                if (status) {
1478                        dev_err(&dev->dev, "Can't attach device\n");
1479                        break;
1480                }
1481        }
1482        return status;
1483}
1484
1485static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1486{
1487        acpi_status status;
1488
1489        if (!device || !device->video)
1490                return -ENOENT;
1491
1492        if (device->flags.notify) {
1493                status = acpi_remove_notify_handler(device->dev->handle,
1494                                ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1495                if (ACPI_FAILURE(status))
1496                        dev_err(&device->dev->dev,
1497                                        "Can't remove video notify handler\n");
1498        }
1499
1500        if (device->backlight) {
1501                backlight_device_unregister(device->backlight);
1502                device->backlight = NULL;
1503        }
1504        if (device->cooling_dev) {
1505                sysfs_remove_link(&device->dev->dev.kobj,
1506                                  "thermal_cooling");
1507                sysfs_remove_link(&device->cooling_dev->device.kobj,
1508                                  "device");
1509                thermal_cooling_device_unregister(device->cooling_dev);
1510                device->cooling_dev = NULL;
1511        }
1512
1513        return 0;
1514}
1515
1516static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1517{
1518        int status;
1519        struct acpi_video_device *dev, *next;
1520
1521        mutex_lock(&video->device_list_lock);
1522
1523        list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1524
1525                status = acpi_video_bus_put_one_device(dev);
1526                if (ACPI_FAILURE(status))
1527                        printk(KERN_WARNING PREFIX
1528                               "hhuuhhuu bug in acpi video driver.\n");
1529
1530                if (dev->brightness) {
1531                        kfree(dev->brightness->levels);
1532                        kfree(dev->brightness);
1533                }
1534                list_del(&dev->entry);
1535                kfree(dev);
1536        }
1537
1538        mutex_unlock(&video->device_list_lock);
1539
1540        return 0;
1541}
1542
1543/* acpi_video interface */
1544
1545/*
1546 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1547 * preform any automatic brightness change on receiving a notification.
1548 */
1549static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1550{
1551        return acpi_video_bus_DOS(video, 0,
1552                                  acpi_video_backlight_quirks() ? 1 : 0);
1553}
1554
1555static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1556{
1557        return acpi_video_bus_DOS(video, 0,
1558                                  acpi_video_backlight_quirks() ? 0 : 1);
1559}
1560
1561static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1562{
1563        struct acpi_video_bus *video = acpi_driver_data(device);
1564        struct input_dev *input;
1565        int keycode = 0;
1566
1567        if (!video)
1568                return;
1569
1570        input = video->input;
1571
1572        switch (event) {
1573        case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1574                                         * most likely via hotkey. */
1575                acpi_bus_generate_proc_event(device, event, 0);
1576                keycode = KEY_SWITCHVIDEOMODE;
1577                break;
1578
1579        case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1580                                         * connector. */
1581                acpi_video_device_enumerate(video);
1582                acpi_video_device_rebind(video);
1583                acpi_bus_generate_proc_event(device, event, 0);
1584                keycode = KEY_SWITCHVIDEOMODE;
1585                break;
1586
1587        case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1588                acpi_bus_generate_proc_event(device, event, 0);
1589                keycode = KEY_SWITCHVIDEOMODE;
1590                break;
1591        case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1592                acpi_bus_generate_proc_event(device, event, 0);
1593                keycode = KEY_VIDEO_NEXT;
1594                break;
1595        case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1596                acpi_bus_generate_proc_event(device, event, 0);
1597                keycode = KEY_VIDEO_PREV;
1598                break;
1599
1600        default:
1601                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1602                                  "Unsupported event [0x%x]\n", event));
1603                break;
1604        }
1605
1606        if (acpi_notifier_call_chain(device, event, 0))
1607                /* Something vetoed the keypress. */
1608                keycode = 0;
1609
1610        if (keycode) {
1611                input_report_key(input, keycode, 1);
1612                input_sync(input);
1613                input_report_key(input, keycode, 0);
1614                input_sync(input);
1615        }
1616
1617        return;
1618}
1619
1620static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1621{
1622        struct acpi_video_device *video_device = data;
1623        struct acpi_device *device = NULL;
1624        struct acpi_video_bus *bus;
1625        struct input_dev *input;
1626        int keycode = 0;
1627
1628        if (!video_device)
1629                return;
1630
1631        device = video_device->dev;
1632        bus = video_device->video;
1633        input = bus->input;
1634
1635        switch (event) {
1636        case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1637                if (brightness_switch_enabled)
1638                        acpi_video_switch_brightness(video_device, event);
1639                acpi_bus_generate_proc_event(device, event, 0);
1640                keycode = KEY_BRIGHTNESS_CYCLE;
1641                break;
1642        case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1643                if (brightness_switch_enabled)
1644                        acpi_video_switch_brightness(video_device, event);
1645                acpi_bus_generate_proc_event(device, event, 0);
1646                keycode = KEY_BRIGHTNESSUP;
1647                break;
1648        case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1649                if (brightness_switch_enabled)
1650                        acpi_video_switch_brightness(video_device, event);
1651                acpi_bus_generate_proc_event(device, event, 0);
1652                keycode = KEY_BRIGHTNESSDOWN;
1653                break;
1654        case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1655                if (brightness_switch_enabled)
1656                        acpi_video_switch_brightness(video_device, event);
1657                acpi_bus_generate_proc_event(device, event, 0);
1658                keycode = KEY_BRIGHTNESS_ZERO;
1659                break;
1660        case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1661                if (brightness_switch_enabled)
1662                        acpi_video_switch_brightness(video_device, event);
1663                acpi_bus_generate_proc_event(device, event, 0);
1664                keycode = KEY_DISPLAY_OFF;
1665                break;
1666        default:
1667                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1668                                  "Unsupported event [0x%x]\n", event));
1669                break;
1670        }
1671
1672        acpi_notifier_call_chain(device, event, 0);
1673
1674        if (keycode) {
1675                input_report_key(input, keycode, 1);
1676                input_sync(input);
1677                input_report_key(input, keycode, 0);
1678                input_sync(input);
1679        }
1680
1681        return;
1682}
1683
1684static int acpi_video_resume(struct notifier_block *nb,
1685                                unsigned long val, void *ign)
1686{
1687        struct acpi_video_bus *video;
1688        struct acpi_video_device *video_device;
1689        int i;
1690
1691        switch (val) {
1692        case PM_HIBERNATION_PREPARE:
1693        case PM_SUSPEND_PREPARE:
1694        case PM_RESTORE_PREPARE:
1695                return NOTIFY_DONE;
1696        }
1697
1698        video = container_of(nb, struct acpi_video_bus, pm_nb);
1699
1700        dev_info(&video->device->dev, "Restoring backlight state\n");
1701
1702        for (i = 0; i < video->attached_count; i++) {
1703                video_device = video->attached_array[i].bind_info;
1704                if (video_device && video_device->backlight)
1705                        acpi_video_set_brightness(video_device->backlight);
1706        }
1707
1708        return NOTIFY_OK;
1709}
1710
1711static acpi_status
1712acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1713                        void **return_value)
1714{
1715        struct acpi_device *device = context;
1716        struct acpi_device *sibling;
1717        int result;
1718
1719        if (handle == device->handle)
1720                return AE_CTRL_TERMINATE;
1721
1722        result = acpi_bus_get_device(handle, &sibling);
1723        if (result)
1724                return AE_OK;
1725
1726        if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1727                        return AE_ALREADY_EXISTS;
1728
1729        return AE_OK;
1730}
1731
1732static int instance;
1733
1734static int acpi_video_bus_add(struct acpi_device *device)
1735{
1736        struct acpi_video_bus *video;
1737        struct input_dev *input;
1738        int error;
1739        acpi_status status;
1740
1741        status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1742                                device->parent->handle, 1,
1743                                acpi_video_bus_match, NULL,
1744                                device, NULL);
1745        if (status == AE_ALREADY_EXISTS) {
1746                printk(KERN_WARNING FW_BUG
1747                        "Duplicate ACPI video bus devices for the"
1748                        " same VGA controller, please try module "
1749                        "parameter \"video.allow_duplicates=1\""
1750                        "if the current driver doesn't work.\n");
1751                if (!allow_duplicates)
1752                        return -ENODEV;
1753        }
1754
1755        video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1756        if (!video)
1757                return -ENOMEM;
1758
1759        /* a hack to fix the duplicate name "VID" problem on T61 */
1760        if (!strcmp(device->pnp.bus_id, "VID")) {
1761                if (instance)
1762                        device->pnp.bus_id[3] = '0' + instance;
1763                instance ++;
1764        }
1765        /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1766        if (!strcmp(device->pnp.bus_id, "VGA")) {
1767                if (instance)
1768                        device->pnp.bus_id[3] = '0' + instance;
1769                instance++;
1770        }
1771
1772        video->device = device;
1773        strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1774        strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1775        device->driver_data = video;
1776
1777        acpi_video_bus_find_cap(video);
1778        error = acpi_video_bus_check(video);
1779        if (error)
1780                goto err_free_video;
1781
1782        mutex_init(&video->device_list_lock);
1783        INIT_LIST_HEAD(&video->video_device_list);
1784
1785        error = acpi_video_bus_get_devices(video, device);
1786        if (error)
1787                goto err_put_video;
1788
1789        video->input = input = input_allocate_device();
1790        if (!input) {
1791                error = -ENOMEM;
1792                goto err_put_video;
1793        }
1794
1795        error = acpi_video_bus_start_devices(video);
1796        if (error)
1797                goto err_free_input_dev;
1798
1799        snprintf(video->phys, sizeof(video->phys),
1800                "%s/video/input0", acpi_device_hid(video->device));
1801
1802        input->name = acpi_device_name(video->device);
1803        input->phys = video->phys;
1804        input->id.bustype = BUS_HOST;
1805        input->id.product = 0x06;
1806        input->dev.parent = &device->dev;
1807        input->evbit[0] = BIT(EV_KEY);
1808        set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1809        set_bit(KEY_VIDEO_NEXT, input->keybit);
1810        set_bit(KEY_VIDEO_PREV, input->keybit);
1811        set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1812        set_bit(KEY_BRIGHTNESSUP, input->keybit);
1813        set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1814        set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1815        set_bit(KEY_DISPLAY_OFF, input->keybit);
1816
1817        printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1818               ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1819               video->flags.multihead ? "yes" : "no",
1820               video->flags.rom ? "yes" : "no",
1821               video->flags.post ? "yes" : "no");
1822
1823        video->pm_nb.notifier_call = acpi_video_resume;
1824        video->pm_nb.priority = 0;
1825        error = register_pm_notifier(&video->pm_nb);
1826        if (error)
1827                goto err_stop_video;
1828
1829        error = input_register_device(input);
1830        if (error)
1831                goto err_unregister_pm_notifier;
1832
1833        return 0;
1834
1835 err_unregister_pm_notifier:
1836        unregister_pm_notifier(&video->pm_nb);
1837 err_stop_video:
1838        acpi_video_bus_stop_devices(video);
1839 err_free_input_dev:
1840        input_free_device(input);
1841 err_put_video:
1842        acpi_video_bus_put_devices(video);
1843        kfree(video->attached_array);
1844 err_free_video:
1845        kfree(video);
1846        device->driver_data = NULL;
1847
1848        return error;
1849}
1850
1851static int acpi_video_bus_remove(struct acpi_device *device)
1852{
1853        struct acpi_video_bus *video = NULL;
1854
1855
1856        if (!device || !acpi_driver_data(device))
1857                return -EINVAL;
1858
1859        video = acpi_driver_data(device);
1860
1861        unregister_pm_notifier(&video->pm_nb);
1862
1863        acpi_video_bus_stop_devices(video);
1864        acpi_video_bus_put_devices(video);
1865
1866        input_unregister_device(video->input);
1867        kfree(video->attached_array);
1868        kfree(video);
1869
1870        return 0;
1871}
1872
1873static int __init is_i740(struct pci_dev *dev)
1874{
1875        if (dev->device == 0x00D1)
1876                return 1;
1877        if (dev->device == 0x7000)
1878                return 1;
1879        return 0;
1880}
1881
1882static int __init intel_opregion_present(void)
1883{
1884        int opregion = 0;
1885        struct pci_dev *dev = NULL;
1886        u32 address;
1887
1888        for_each_pci_dev(dev) {
1889                if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1890                        continue;
1891                if (dev->vendor != PCI_VENDOR_ID_INTEL)
1892                        continue;
1893                /* We don't want to poke around undefined i740 registers */
1894                if (is_i740(dev))
1895                        continue;
1896                pci_read_config_dword(dev, 0xfc, &address);
1897                if (!address)
1898                        continue;
1899                opregion = 1;
1900        }
1901        return opregion;
1902}
1903
1904int acpi_video_register(void)
1905{
1906        int result = 0;
1907        if (register_count) {
1908                /*
1909                 * if the function of acpi_video_register is already called,
1910                 * don't register the acpi_vide_bus again and return no error.
1911                 */
1912                return 0;
1913        }
1914
1915        result = acpi_bus_register_driver(&acpi_video_bus);
1916        if (result < 0)
1917                return -ENODEV;
1918
1919        /*
1920         * When the acpi_video_bus is loaded successfully, increase
1921         * the counter reference.
1922         */
1923        register_count = 1;
1924
1925        return 0;
1926}
1927EXPORT_SYMBOL(acpi_video_register);
1928
1929void acpi_video_unregister(void)
1930{
1931        if (!register_count) {
1932                /*
1933                 * If the acpi video bus is already unloaded, don't
1934                 * unload it again and return directly.
1935                 */
1936                return;
1937        }
1938        acpi_bus_unregister_driver(&acpi_video_bus);
1939
1940        register_count = 0;
1941
1942        return;
1943}
1944EXPORT_SYMBOL(acpi_video_unregister);
1945
1946/*
1947 * This is kind of nasty. Hardware using Intel chipsets may require
1948 * the video opregion code to be run first in order to initialise
1949 * state before any ACPI video calls are made. To handle this we defer
1950 * registration of the video class until the opregion code has run.
1951 */
1952
1953static int __init acpi_video_init(void)
1954{
1955        dmi_check_system(video_dmi_table);
1956
1957        if (intel_opregion_present())
1958                return 0;
1959
1960        return acpi_video_register();
1961}
1962
1963static void __exit acpi_video_exit(void)
1964{
1965        acpi_video_unregister();
1966
1967        return;
1968}
1969
1970module_init(acpi_video_init);
1971module_exit(acpi_video_exit);
1972
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