drivers/acpi/video.c

   1 /*
   2  *  video.c - ACPI Video Driver ($Revision:$)
   3  *
   4  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
   5  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
   6  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/types.h>
  31 #include <linux/list.h>
  32 #include <linux/mutex.h>
  33 #include <linux/input.h>
  34 #include <linux/backlight.h>
  35 #include <linux/thermal.h>
  36 #include <linux/sort.h>
  37 #include <linux/pci.h>
  38 #include <linux/pci_ids.h>
  39 #include <linux/slab.h>
  40 #include <asm/uaccess.h>
  41 #include <linux/dmi.h>
  42 #include <acpi/acpi_bus.h>
  43 #include <acpi/acpi_drivers.h>
  44 #include <linux/suspend.h>
  45 #include <acpi/video.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_VIDEO_BUS_NAME             "Video Bus"
  50 #define ACPI_VIDEO_DEVICE_NAME          "Video Device"
  51 #define ACPI_VIDEO_NOTIFY_SWITCH        0x80
  52 #define ACPI_VIDEO_NOTIFY_PROBE         0x81
  53 #define ACPI_VIDEO_NOTIFY_CYCLE         0x82
  54 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
  55 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
  56
  57 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x85
  58 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x86
  59 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x87
  60 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x88
  61 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x89
  62
  63 #define MAX_NAME_LEN    20
  64
  65 #define _COMPONENT              ACPI_VIDEO_COMPONENT
  66 ACPI_MODULE_NAME("video");
  67
  68 MODULE_AUTHOR("Bruno Ducrot");
  69 MODULE_DESCRIPTION("ACPI Video Driver");
  70 MODULE_LICENSE("GPL");
  71
  72 static bool brightness_switch_enabled = 1;
  73 module_param(brightness_switch_enabled, bool, 0644);
  74
  75 /*
  76  * By default, we don't allow duplicate ACPI video bus devices
  77  * under the same VGA controller
  78  */
  79 static bool allow_duplicates;
  80 module_param(allow_duplicates, bool, 0644);
  81
  82 /*
  83  * Some BIOSes claim they use minimum backlight at boot,
  84  * and this may bring dimming screen after boot
  85  */
  86 static bool use_bios_initial_backlight = 1;
  87 module_param(use_bios_initial_backlight, bool, 0644);
  88
  89 static int register_count = 0;
  90 static int acpi_video_bus_add(struct acpi_device *device);
  91 static int acpi_video_bus_remove(struct acpi_device *device);
  92 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
  93
  94 static const struct acpi_device_id video_device_ids[] = {
  95         {ACPI_VIDEO_HID, 0},
  96         {"", 0},
  97 };
  98 MODULE_DEVICE_TABLE(acpi, video_device_ids);
  99
 100 static struct acpi_driver acpi_video_bus = {
 101         .name = "video",
 102         .class = ACPI_VIDEO_CLASS,
 103         .ids = video_device_ids,
 104         .ops = {
 105                 .add = acpi_video_bus_add,
 106                 .remove = acpi_video_bus_remove,
 107                 .notify = acpi_video_bus_notify,
 108                 },
 109 };
 110
 111 struct acpi_video_bus_flags {
 112         u8 multihead:1;         /* can switch video heads */
 113         u8 rom:1;               /* can retrieve a video rom */
 114         u8 post:1;              /* can configure the head to */
 115         u8 reserved:5;
 116 };
 117
 118 struct acpi_video_bus_cap {
 119         u8 _DOS:1;              /*Enable/Disable output switching */
 120         u8 _DOD:1;              /*Enumerate all devices attached to display adapter */
 121         u8 _ROM:1;              /*Get ROM Data */
 122         u8 _GPD:1;              /*Get POST Device */
 123         u8 _SPD:1;              /*Set POST Device */
 124         u8 _VPO:1;              /*Video POST Options */
 125         u8 reserved:2;
 126 };
 127
 128 struct acpi_video_device_attrib {
 129         u32 display_index:4;    /* A zero-based instance of the Display */
 130         u32 display_port_attachment:4;  /*This field differentiates the display type */
 131         u32 display_type:4;     /*Describe the specific type in use */
 132         u32 vendor_specific:4;  /*Chipset Vendor Specific */
 133         u32 bios_can_detect:1;  /*BIOS can detect the device */
 134         u32 depend_on_vga:1;    /*Non-VGA output device whose power is related to
 135                                    the VGA device. */
 136         u32 pipe_id:3;          /*For VGA multiple-head devices. */
 137         u32 reserved:10;        /*Must be 0 */
 138         u32 device_id_scheme:1; /*Device ID Scheme */
 139 };
 140
 141 struct acpi_video_enumerated_device {
 142         union {
 143                 u32 int_val;
 144                 struct acpi_video_device_attrib attrib;
 145         } value;
 146         struct acpi_video_device *bind_info;
 147 };
 148
 149 struct acpi_video_bus {
 150         struct acpi_device *device;
 151         u8 dos_setting;
 152         struct acpi_video_enumerated_device *attached_array;
 153         u8 attached_count;
 154         struct acpi_video_bus_cap cap;
 155         struct acpi_video_bus_flags flags;
 156         struct list_head video_device_list;
 157         struct mutex device_list_lock;  /* protects video_device_list */
 158         struct input_dev *input;
 159         char phys[32];  /* for input device */
 160         struct notifier_block pm_nb;
 161 };
 162
 163 struct acpi_video_device_flags {
 164         u8 crt:1;
 165         u8 lcd:1;
 166         u8 tvout:1;
 167         u8 dvi:1;
 168         u8 bios:1;
 169         u8 unknown:1;
 170         u8 notify:1;
 171         u8 reserved:1;
 172 };
 173
 174 struct acpi_video_device_cap {
 175         u8 _ADR:1;              /*Return the unique ID */
 176         u8 _BCL:1;              /*Query list of brightness control levels supported */
 177         u8 _BCM:1;              /*Set the brightness level */
 178         u8 _BQC:1;              /* Get current brightness level */
 179         u8 _BCQ:1;              /* Some buggy BIOS uses _BCQ instead of _BQC */
 180         u8 _DDC:1;              /*Return the EDID for this device */
 181 };
 182
 183 struct acpi_video_brightness_flags {
 184         u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
 185         u8 _BCL_reversed:1;             /* _BCL package is in a reversed order*/
 186         u8 _BCL_use_index:1;            /* levels in _BCL are index values */
 187         u8 _BCM_use_index:1;            /* input of _BCM is an index value */
 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 =
 238                 (struct acpi_video_device *)bl_get_data(bd);
 239
 240         if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
 241                 return -EINVAL;
 242         for (i = 2; i < vd->brightness->count; i++) {
 243                 if (vd->brightness->levels[i] == cur_level)
 244                         /* The first two entries are special - see page 575
 245                            of the ACPI spec 3.0 */
 246                         return i-2;
 247         }
 248         return 0;
 249 }
 250
 251 static int acpi_video_set_brightness(struct backlight_device *bd)
 252 {
 253         int request_level = bd->props.brightness + 2;
 254         struct acpi_video_device *vd =
 255                 (struct acpi_video_device *)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                                Video Management
 319    -------------------------------------------------------------------------- */
 320
 321 static int
 322 acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
 323                                    union acpi_object **levels)
 324 {
 325         int status;
 326         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 327         union acpi_object *obj;
 328
 329
 330         *levels = NULL;
 331
 332         status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
 333         if (!ACPI_SUCCESS(status))
 334                 return status;
 335         obj = (union acpi_object *)buffer.pointer;
 336         if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
 337                 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
 338                 status = -EFAULT;
 339                 goto err;
 340         }
 341
 342         *levels = obj;
 343
 344         return 0;
 345
 346       err:
 347         kfree(buffer.pointer);
 348
 349         return status;
 350 }
 351
 352 static int
 353 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
 354 {
 355         int status;
 356         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 357         struct acpi_object_list args = { 1, &arg0 };
 358         int state;
 359
 360         arg0.integer.value = level;
 361
 362         status = acpi_evaluate_object(device->dev->handle, "_BCM",
 363                                       &args, NULL);
 364         if (ACPI_FAILURE(status)) {
 365                 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
 366                 return -EIO;
 367         }
 368
 369         device->brightness->curr = level;
 370         for (state = 2; state < device->brightness->count; state++)
 371                 if (level == device->brightness->levels[state]) {
 372                         if (device->backlight)
 373                                 device->backlight->props.brightness = state - 2;
 374                         return 0;
 375                 }
 376
 377         ACPI_ERROR((AE_INFO, "Current brightness invalid"));
 378         return -EINVAL;
 379 }
 380
 381 /*
 382  * For some buggy _BQC methods, we need to add a constant value to
 383  * the _BQC return value to get the actual current brightness level
 384  */
 385
 386 static int bqc_offset_aml_bug_workaround;
 387 static int __init video_set_bqc_offset(const struct dmi_system_id *d)
 388 {
 389         bqc_offset_aml_bug_workaround = 9;
 390         return 0;
 391 }
 392
 393 static int video_ignore_initial_backlight(const struct dmi_system_id *d)
 394 {
 395         use_bios_initial_backlight = 0;
 396         return 0;
 397 }
 398
 399 static struct dmi_system_id video_dmi_table[] __initdata = {
 400         /*
 401          * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
 402          */
 403         {
 404          .callback = video_set_bqc_offset,
 405          .ident = "Acer Aspire 5720",
 406          .matches = {
 407                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 408                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
 409                 },
 410         },
 411         {
 412          .callback = video_set_bqc_offset,
 413          .ident = "Acer Aspire 5710Z",
 414          .matches = {
 415                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 416                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
 417                 },
 418         },
 419         {
 420          .callback = video_set_bqc_offset,
 421          .ident = "eMachines E510",
 422          .matches = {
 423                 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
 424                 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
 425                 },
 426         },
 427         {
 428          .callback = video_set_bqc_offset,
 429          .ident = "Acer Aspire 5315",
 430          .matches = {
 431                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 432                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
 433                 },
 434         },
 435         {
 436          .callback = video_set_bqc_offset,
 437          .ident = "Acer Aspire 7720",
 438          .matches = {
 439                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 440                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
 441                 },
 442         },
 443         {
 444          .callback = video_ignore_initial_backlight,
 445          .ident = "HP Folio 13-2000",
 446          .matches = {
 447                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 448                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"),
 449                 },
 450         },
 451         {
 452          .callback = video_ignore_initial_backlight,
 453          .ident = "HP Pavilion dm4",
 454          .matches = {
 455                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 456                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"),
 457                 },
 458         },
 459         {
 460          .callback = video_ignore_initial_backlight,
 461          .ident = "HP 1000 Notebook PC",
 462          .matches = {
 463                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 464                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
 465                 },
 466         },
 467         {}
 468 };
 469
 470 static unsigned long long
 471 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 472                               unsigned long long bqc_value)
 473 {
 474         unsigned long long level;
 475
 476         if (device->brightness->flags._BQC_use_index) {
 477                 /*
 478                  * _BQC returns an index that doesn't account for
 479                  * the first 2 items with special meaning, so we need
 480                  * to compensate for that by offsetting ourselves
 481                  */
 482                 if (device->brightness->flags._BCL_reversed)
 483                         bqc_value = device->brightness->count - 3 - bqc_value;
 484
 485                 level = device->brightness->levels[bqc_value + 2];
 486         } else {
 487                 level = bqc_value;
 488         }
 489
 490         level += bqc_offset_aml_bug_workaround;
 491
 492         return level;
 493 }
 494
 495 static int
 496 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 497                                         unsigned long long *level, bool raw)
 498 {
 499         acpi_status status = AE_OK;
 500         int i;
 501
 502         if (device->cap._BQC || device->cap._BCQ) {
 503                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 504
 505                 status = acpi_evaluate_integer(device->dev->handle, buf,
 506                                                 NULL, level);
 507                 if (ACPI_SUCCESS(status)) {
 508                         if (raw) {
 509                                 /*
 510                                  * Caller has indicated he wants the raw
 511                                  * value returned by _BQC, so don't furtherly
 512                                  * mess with the value.
 513                                  */
 514                                 return 0;
 515                         }
 516
 517                         *level = acpi_video_bqc_value_to_level(device, *level);
 518
 519                         for (i = 2; i < device->brightness->count; i++)
 520                                 if (device->brightness->levels[i] == *level) {
 521                                         device->brightness->curr = *level;
 522                                         return 0;
 523                         }
 524                         /*
 525                          * BQC returned an invalid level.
 526                          * Stop using it.
 527                          */
 528                         ACPI_WARNING((AE_INFO,
 529                                       "%s returned an invalid level",
 530                                       buf));
 531                         device->cap._BQC = device->cap._BCQ = 0;
 532                 } else {
 533                         /* Fixme:
 534                          * should we return an error or ignore this failure?
 535                          * dev->brightness->curr is a cached value which stores
 536                          * the correct current backlight level in most cases.
 537                          * ACPI video backlight still works w/ buggy _BQC.
 538                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 539                          */
 540                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 541                         device->cap._BQC = device->cap._BCQ = 0;
 542                 }
 543         }
 544
 545         *level = device->brightness->curr;
 546         return 0;
 547 }
 548
 549 static int
 550 acpi_video_device_EDID(struct acpi_video_device *device,
 551                        union acpi_object **edid, ssize_t length)
 552 {
 553         int status;
 554         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 555         union acpi_object *obj;
 556         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 557         struct acpi_object_list args = { 1, &arg0 };
 558
 559
 560         *edid = NULL;
 561
 562         if (!device)
 563                 return -ENODEV;
 564         if (length == 128)
 565                 arg0.integer.value = 1;
 566         else if (length == 256)
 567                 arg0.integer.value = 2;
 568         else
 569                 return -EINVAL;
 570
 571         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 572         if (ACPI_FAILURE(status))
 573                 return -ENODEV;
 574
 575         obj = buffer.pointer;
 576
 577         if (obj && obj->type == ACPI_TYPE_BUFFER)
 578                 *edid = obj;
 579         else {
 580                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 581                 status = -EFAULT;
 582                 kfree(obj);
 583         }
 584
 585         return status;
 586 }
 587
 588 /* bus */
 589
 590 /*
 591  *  Arg:
 592  *      video           : video bus device pointer
 593  *      bios_flag       :
 594  *              0.      The system BIOS should NOT automatically switch(toggle)
 595  *                      the active display output.
 596  *              1.      The system BIOS should automatically switch (toggle) the
 597  *                      active display output. No switch event.
 598  *              2.      The _DGS value should be locked.
 599  *              3.      The system BIOS should not automatically switch (toggle) the
 600  *                      active display output, but instead generate the display switch
 601  *                      event notify code.
 602  *      lcd_flag        :
 603  *              0.      The system BIOS should automatically control the brightness level
 604  *                      of the LCD when the power changes from AC to DC
 605  *              1.      The system BIOS should NOT automatically control the brightness
 606  *                      level of the LCD when the power changes from AC to DC.
 607  * Return Value:
 608  *              -EINVAL wrong arg.
 609  */
 610
 611 static int
 612 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 613 {
 614         acpi_status status;
 615         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 616         struct acpi_object_list args = { 1, &arg0 };
 617
 618         if (!video->cap._DOS)
 619                 return 0;
 620
 621         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 622                 return -EINVAL;
 623         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 624         video->dos_setting = arg0.integer.value;
 625         status = acpi_evaluate_object(video->device->handle, "_DOS",
 626                 &args, NULL);
 627         if (ACPI_FAILURE(status))
 628                 return -EIO;
 629
 630         return 0;
 631 }
 632
 633 /*
 634  * Simple comparison function used to sort backlight levels.
 635  */
 636
 637 static int
 638 acpi_video_cmp_level(const void *a, const void *b)
 639 {
 640         return *(int *)a - *(int *)b;
 641 }
 642
 643 /*
 644  * Decides if _BQC/_BCQ for this system is usable
 645  *
 646  * We do this by changing the level first and then read out the current
 647  * brightness level, if the value does not match, find out if it is using
 648  * index. If not, clear the _BQC/_BCQ capability.
 649  */
 650 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 651                                 int max_level, int current_level)
 652 {
 653         struct acpi_video_device_brightness *br = device->brightness;
 654         int result;
 655         unsigned long long level;
 656         int test_level;
 657
 658         /* don't mess with existing known broken systems */
 659         if (bqc_offset_aml_bug_workaround)
 660                 return 0;
 661
 662         /*
 663          * Some systems always report current brightness level as maximum
 664          * through _BQC, we need to test another value for them.
 665          */
 666         test_level = current_level == max_level ? br->levels[2] : max_level;
 667
 668         result = acpi_video_device_lcd_set_level(device, test_level);
 669         if (result)
 670                 return result;
 671
 672         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 673         if (result)
 674                 return result;
 675
 676         if (level != test_level) {
 677                 /* buggy _BQC found, need to find out if it uses index */
 678                 if (level < br->count) {
 679                         if (br->flags._BCL_reversed)
 680                                 level = br->count - 3 - level;
 681                         if (br->levels[level + 2] == test_level)
 682                                 br->flags._BQC_use_index = 1;
 683                 }
 684
 685                 if (!br->flags._BQC_use_index)
 686                         device->cap._BQC = device->cap._BCQ = 0;
 687         }
 688
 689         return 0;
 690 }
 691
 692
 693 /*
 694  *  Arg:
 695  *      device  : video output device (LCD, CRT, ..)
 696  *
 697  *  Return Value:
 698  *      Maximum brightness level
 699  *
 700  *  Allocate and initialize device->brightness.
 701  */
 702
 703 static int
 704 acpi_video_init_brightness(struct acpi_video_device *device)
 705 {
 706         union acpi_object *obj = NULL;
 707         int i, max_level = 0, count = 0, level_ac_battery = 0;
 708         unsigned long long level, level_old;
 709         union acpi_object *o;
 710         struct acpi_video_device_brightness *br = NULL;
 711         int result = -EINVAL;
 712
 713         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 714                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 715                                                 "LCD brightness level\n"));
 716                 goto out;
 717         }
 718
 719         if (obj->package.count < 2)
 720                 goto out;
 721
 722         br = kzalloc(sizeof(*br), GFP_KERNEL);
 723         if (!br) {
 724                 printk(KERN_ERR "can't allocate memory\n");
 725                 result = -ENOMEM;
 726                 goto out;
 727         }
 728
 729         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 730                                 GFP_KERNEL);
 731         if (!br->levels) {
 732                 result = -ENOMEM;
 733                 goto out_free;
 734         }
 735
 736         for (i = 0; i < obj->package.count; i++) {
 737                 o = (union acpi_object *)&obj->package.elements[i];
 738                 if (o->type != ACPI_TYPE_INTEGER) {
 739                         printk(KERN_ERR PREFIX "Invalid data\n");
 740                         continue;
 741                 }
 742                 br->levels[count] = (u32) o->integer.value;
 743
 744                 if (br->levels[count] > max_level)
 745                         max_level = br->levels[count];
 746                 count++;
 747         }
 748
 749         /*
 750          * some buggy BIOS don't export the levels
 751          * when machine is on AC/Battery in _BCL package.
 752          * In this case, the first two elements in _BCL packages
 753          * are also supported brightness levels that OS should take care of.
 754          */
 755         for (i = 2; i < count; i++) {
 756                 if (br->levels[i] == br->levels[0])
 757                         level_ac_battery++;
 758                 if (br->levels[i] == br->levels[1])
 759                         level_ac_battery++;
 760         }
 761
 762         if (level_ac_battery < 2) {
 763                 level_ac_battery = 2 - level_ac_battery;
 764                 br->flags._BCL_no_ac_battery_levels = 1;
 765                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 766                         br->levels[i] = br->levels[i - level_ac_battery];
 767                 count += level_ac_battery;
 768         } else if (level_ac_battery > 2)
 769                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 770
 771         /* Check if the _BCL package is in a reversed order */
 772         if (max_level == br->levels[2]) {
 773                 br->flags._BCL_reversed = 1;
 774                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 775                         acpi_video_cmp_level, NULL);
 776         } else if (max_level != br->levels[count - 1])
 777                 ACPI_ERROR((AE_INFO,
 778                             "Found unordered _BCL package"));
 779
 780         br->count = count;
 781         device->brightness = br;
 782
 783         /* Check the input/output of _BQC/_BCL/_BCM */
 784         if ((max_level < 100) && (max_level <= (count - 2)))
 785                 br->flags._BCL_use_index = 1;
 786
 787         /*
 788          * _BCM is always consistent with _BCL,
 789          * at least for all the laptops we have ever seen.
 790          */
 791         br->flags._BCM_use_index = br->flags._BCL_use_index;
 792
 793         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 794         br->curr = level = max_level;
 795
 796         if (!device->cap._BQC)
 797                 goto set_level;
 798
 799         result = acpi_video_device_lcd_get_level_current(device,
 800                                                          &level_old, true);
 801         if (result)
 802                 goto out_free_levels;
 803
 804         result = acpi_video_bqc_quirk(device, max_level, level_old);
 805         if (result)
 806                 goto out_free_levels;
 807         /*
 808          * cap._BQC may get cleared due to _BQC is found to be broken
 809          * in acpi_video_bqc_quirk, so check again here.
 810          */
 811         if (!device->cap._BQC)
 812                 goto set_level;
 813
 814         if (use_bios_initial_backlight) {
 815                 level = acpi_video_bqc_value_to_level(device, level_old);
 816                 /*
 817                  * On some buggy laptops, _BQC returns an uninitialized
 818                  * value when invoked for the first time, i.e.
 819                  * level_old is invalid (no matter whether it's a level
 820                  * or an index). Set the backlight to max_level in this case.
 821                  */
 822                 for (i = 2; i < br->count; i++)
 823                         if (level_old == br->levels[i])
 824                                 break;
 825                 if (i == br->count)
 826                         level = max_level;
 827         }
 828
 829 set_level:
 830         result = acpi_video_device_lcd_set_level(device, level);
 831         if (result)
 832                 goto out_free_levels;
 833
 834         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 835                           "found %d brightness levels\n", count - 2));
 836         kfree(obj);
 837         return result;
 838
 839 out_free_levels:
 840         kfree(br->levels);
 841 out_free:
 842         kfree(br);
 843 out:
 844         device->brightness = NULL;
 845         kfree(obj);
 846         return result;
 847 }
 848
 849 /*
 850  *  Arg:
 851  *      device  : video output device (LCD, CRT, ..)
 852  *
 853  *  Return Value:
 854  *      None
 855  *
 856  *  Find out all required AML methods defined under the output
 857  *  device.
 858  */
 859
 860 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 861 {
 862         acpi_handle h_dummy1;
 863
 864         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 865                 device->cap._ADR = 1;
 866         }
 867         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 868                 device->cap._BCL = 1;
 869         }
 870         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 871                 device->cap._BCM = 1;
 872         }
 873         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 874                 device->cap._BQC = 1;
 875         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 876                                 &h_dummy1))) {
 877                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 878                 device->cap._BCQ = 1;
 879         }
 880
 881         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 882                 device->cap._DDC = 1;
 883         }
 884
 885         if (acpi_video_backlight_support()) {
 886                 struct backlight_properties props;
 887                 struct pci_dev *pdev;
 888                 acpi_handle acpi_parent;
 889                 struct device *parent = NULL;
 890                 int result;
 891                 static int count = 0;
 892                 char *name;
 893
 894                 result = acpi_video_init_brightness(device);
 895                 if (result)
 896                         return;
 897                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 898                 if (!name)
 899                         return;
 900                 count++;
 901
 902                 acpi_get_parent(device->dev->handle, &acpi_parent);
 903
 904                 pdev = acpi_get_pci_dev(acpi_parent);
 905                 if (pdev) {
 906                         parent = &pdev->dev;
 907                         pci_dev_put(pdev);
 908                 }
 909
 910                 memset(&props, 0, sizeof(struct backlight_properties));
 911                 props.type = BACKLIGHT_FIRMWARE;
 912                 props.max_brightness = device->brightness->count - 3;
 913                 device->backlight = backlight_device_register(name,
 914                                                               parent,
 915                                                               device,
 916                                                               &acpi_backlight_ops,
 917                                                               &props);
 918                 kfree(name);
 919                 if (IS_ERR(device->backlight))
 920                         return;
 921
 922                 /*
 923                  * Save current brightness level in case we have to restore it
 924                  * before acpi_video_device_lcd_set_level() is called next time.
 925                  */
 926                 device->backlight->props.brightness =
 927                                 acpi_video_get_brightness(device->backlight);
 928
 929                 device->cooling_dev = thermal_cooling_device_register("LCD",
 930                                         device->dev, &video_cooling_ops);
 931                 if (IS_ERR(device->cooling_dev)) {
 932                         /*
 933                          * Set cooling_dev to NULL so we don't crash trying to
 934                          * free it.
 935                          * Also, why the hell we are returning early and
 936                          * not attempt to register video output if cooling
 937                          * device registration failed?
 938                          * -- dtor
 939                          */
 940                         device->cooling_dev = NULL;
 941                         return;
 942                 }
 943
 944                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 945                          device->cooling_dev->id);
 946                 result = sysfs_create_link(&device->dev->dev.kobj,
 947                                 &device->cooling_dev->device.kobj,
 948                                 "thermal_cooling");
 949                 if (result)
 950                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 951                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 952                                 &device->dev->dev.kobj, "device");
 953                 if (result)
 954                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 955
 956         }
 957 }
 958
 959 /*
 960  *  Arg:
 961  *      device  : video output device (VGA)
 962  *
 963  *  Return Value:
 964  *      None
 965  *
 966  *  Find out all required AML methods defined under the video bus device.
 967  */
 968
 969 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 970 {
 971         acpi_handle h_dummy1;
 972
 973         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 974                 video->cap._DOS = 1;
 975         }
 976         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 977                 video->cap._DOD = 1;
 978         }
 979         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 980                 video->cap._ROM = 1;
 981         }
 982         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 983                 video->cap._GPD = 1;
 984         }
 985         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
 986                 video->cap._SPD = 1;
 987         }
 988         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
 989                 video->cap._VPO = 1;
 990         }
 991 }
 992
 993 /*
 994  * Check whether the video bus device has required AML method to
 995  * support the desired features
 996  */
 997
 998 static int acpi_video_bus_check(struct acpi_video_bus *video)
 999 {
1000         acpi_status status = -ENOENT;
1001         struct pci_dev *dev;
1002
1003         if (!video)
1004                 return -EINVAL;
1005
1006         dev = acpi_get_pci_dev(video->device->handle);
1007         if (!dev)
1008                 return -ENODEV;
1009         pci_dev_put(dev);
1010
1011         /* Since there is no HID, CID and so on for VGA driver, we have
1012          * to check well known required nodes.
1013          */
1014
1015         /* Does this device support video switching? */
1016         if (video->cap._DOS || video->cap._DOD) {
1017                 if (!video->cap._DOS) {
1018                         printk(KERN_WARNING FW_BUG
1019                                 "ACPI(%s) defines _DOD but not _DOS\n",
1020                                 acpi_device_bid(video->device));
1021                 }
1022                 video->flags.multihead = 1;
1023                 status = 0;
1024         }
1025
1026         /* Does this device support retrieving a video ROM? */
1027         if (video->cap._ROM) {
1028                 video->flags.rom = 1;
1029                 status = 0;
1030         }
1031
1032         /* Does this device support configuring which video device to POST? */
1033         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1034                 video->flags.post = 1;
1035                 status = 0;
1036         }
1037
1038         return status;
1039 }
1040
1041 /* --------------------------------------------------------------------------
1042                                  Driver Interface
1043    -------------------------------------------------------------------------- */
1044
1045 /* device interface */
1046 static struct acpi_video_device_attrib*
1047 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1048 {
1049         struct acpi_video_enumerated_device *ids;
1050         int i;
1051
1052         for (i = 0; i < video->attached_count; i++) {
1053                 ids = &video->attached_array[i];
1054                 if ((ids->value.int_val & 0xffff) == device_id)
1055                         return &ids->value.attrib;
1056         }
1057
1058         return NULL;
1059 }
1060
1061 static int
1062 acpi_video_get_device_type(struct acpi_video_bus *video,
1063                            unsigned long device_id)
1064 {
1065         struct acpi_video_enumerated_device *ids;
1066         int i;
1067
1068         for (i = 0; i < video->attached_count; i++) {
1069                 ids = &video->attached_array[i];
1070                 if ((ids->value.int_val & 0xffff) == device_id)
1071                         return ids->value.int_val;
1072         }
1073
1074         return 0;
1075 }
1076
1077 static int
1078 acpi_video_bus_get_one_device(struct acpi_device *device,
1079                               struct acpi_video_bus *video)
1080 {
1081         unsigned long long device_id;
1082         int status, device_type;
1083         struct acpi_video_device *data;
1084         struct acpi_video_device_attrib* attribute;
1085
1086         status =
1087             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1088         /* Some device omits _ADR, we skip them instead of fail */
1089         if (ACPI_FAILURE(status))
1090                 return 0;
1091
1092         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1093         if (!data)
1094                 return -ENOMEM;
1095
1096         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1097         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1098         device->driver_data = data;
1099
1100         data->device_id = device_id;
1101         data->video = video;
1102         data->dev = device;
1103
1104         attribute = acpi_video_get_device_attr(video, device_id);
1105
1106         if((attribute != NULL) && attribute->device_id_scheme) {
1107                 switch (attribute->display_type) {
1108                 case ACPI_VIDEO_DISPLAY_CRT:
1109                         data->flags.crt = 1;
1110                         break;
1111                 case ACPI_VIDEO_DISPLAY_TV:
1112                         data->flags.tvout = 1;
1113                         break;
1114                 case ACPI_VIDEO_DISPLAY_DVI:
1115                         data->flags.dvi = 1;
1116                         break;
1117                 case ACPI_VIDEO_DISPLAY_LCD:
1118                         data->flags.lcd = 1;
1119                         break;
1120                 default:
1121                         data->flags.unknown = 1;
1122                         break;
1123                 }
1124                 if(attribute->bios_can_detect)
1125                         data->flags.bios = 1;
1126         } else {
1127                 /* Check for legacy IDs */
1128                 device_type = acpi_video_get_device_type(video, device_id);
1129                 /* Ignore bits 16 and 18-20 */
1130                 switch (device_type & 0xffe2ffff) {
1131                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1132                                 data->flags.crt = 1;
1133                                 break;
1134                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1135                                 data->flags.lcd = 1;
1136                                 break;
1137                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1138                                 data->flags.tvout = 1;
1139                                 break;
1140                         default:
1141                                 data->flags.unknown = 1;
1142                 }
1143         }
1144
1145         acpi_video_device_bind(video, data);
1146         acpi_video_device_find_cap(data);
1147
1148         status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1149                                              acpi_video_device_notify, data);
1150         if (ACPI_FAILURE(status))
1151                 dev_err(&device->dev, "Error installing notify handler\n");
1152         else
1153                 data->flags.notify = 1;
1154
1155         mutex_lock(&video->device_list_lock);
1156         list_add_tail(&data->entry, &video->video_device_list);
1157         mutex_unlock(&video->device_list_lock);
1158
1159         return status;
1160 }
1161
1162 /*
1163  *  Arg:
1164  *      video   : video bus device
1165  *
1166  *  Return:
1167  *      none
1168  *
1169  *  Enumerate the video device list of the video bus,
1170  *  bind the ids with the corresponding video devices
1171  *  under the video bus.
1172  */
1173
1174 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1175 {
1176         struct acpi_video_device *dev;
1177
1178         mutex_lock(&video->device_list_lock);
1179
1180         list_for_each_entry(dev, &video->video_device_list, entry)
1181                 acpi_video_device_bind(video, dev);
1182
1183         mutex_unlock(&video->device_list_lock);
1184 }
1185
1186 /*
1187  *  Arg:
1188  *      video   : video bus device
1189  *      device  : video output device under the video
1190  *              bus
1191  *
1192  *  Return:
1193  *      none
1194  *
1195  *  Bind the ids with the corresponding video devices
1196  *  under the video bus.
1197  */
1198
1199 static void
1200 acpi_video_device_bind(struct acpi_video_bus *video,
1201                        struct acpi_video_device *device)
1202 {
1203         struct acpi_video_enumerated_device *ids;
1204         int i;
1205
1206         for (i = 0; i < video->attached_count; i++) {
1207                 ids = &video->attached_array[i];
1208                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1209                         ids->bind_info = device;
1210                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1211                 }
1212         }
1213 }
1214
1215 /*
1216  *  Arg:
1217  *      video   : video bus device
1218  *
1219  *  Return:
1220  *      < 0     : error
1221  *
1222  *  Call _DOD to enumerate all devices attached to display adapter
1223  *
1224  */
1225
1226 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1227 {
1228         int status;
1229         int count;
1230         int i;
1231         struct acpi_video_enumerated_device *active_list;
1232         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1233         union acpi_object *dod = NULL;
1234         union acpi_object *obj;
1235
1236         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1237         if (!ACPI_SUCCESS(status)) {
1238                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1239                 return status;
1240         }
1241
1242         dod = buffer.pointer;
1243         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1244                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1245                 status = -EFAULT;
1246                 goto out;
1247         }
1248
1249         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1250                           dod->package.count));
1251
1252         active_list = kcalloc(1 + dod->package.count,
1253                               sizeof(struct acpi_video_enumerated_device),
1254                               GFP_KERNEL);
1255         if (!active_list) {
1256                 status = -ENOMEM;
1257                 goto out;
1258         }
1259
1260         count = 0;
1261         for (i = 0; i < dod->package.count; i++) {
1262                 obj = &dod->package.elements[i];
1263
1264                 if (obj->type != ACPI_TYPE_INTEGER) {
1265                         printk(KERN_ERR PREFIX
1266                                 "Invalid _DOD data in element %d\n", i);
1267                         continue;
1268                 }
1269
1270                 active_list[count].value.int_val = obj->integer.value;
1271                 active_list[count].bind_info = NULL;
1272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1273                                   (int)obj->integer.value));
1274                 count++;
1275         }
1276
1277         kfree(video->attached_array);
1278
1279         video->attached_array = active_list;
1280         video->attached_count = count;
1281
1282  out:
1283         kfree(buffer.pointer);
1284         return status;
1285 }
1286
1287 static int
1288 acpi_video_get_next_level(struct acpi_video_device *device,
1289                           u32 level_current, u32 event)
1290 {
1291         int min, max, min_above, max_below, i, l, delta = 255;
1292         max = max_below = 0;
1293         min = min_above = 255;
1294         /* Find closest level to level_current */
1295         for (i = 2; i < device->brightness->count; i++) {
1296                 l = device->brightness->levels[i];
1297                 if (abs(l - level_current) < abs(delta)) {
1298                         delta = l - level_current;
1299                         if (!delta)
1300                                 break;
1301                 }
1302         }
1303         /* Ajust level_current to closest available level */
1304         level_current += delta;
1305         for (i = 2; i < device->brightness->count; i++) {
1306                 l = device->brightness->levels[i];
1307                 if (l < min)
1308                         min = l;
1309                 if (l > max)
1310                         max = l;
1311                 if (l < min_above && l > level_current)
1312                         min_above = l;
1313                 if (l > max_below && l < level_current)
1314                         max_below = l;
1315         }
1316
1317         switch (event) {
1318         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1319                 return (level_current < max) ? min_above : min;
1320         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1321                 return (level_current < max) ? min_above : max;
1322         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1323                 return (level_current > min) ? max_below : min;
1324         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1325         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1326                 return 0;
1327         default:
1328                 return level_current;
1329         }
1330 }
1331
1332 static int
1333 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1334 {
1335         unsigned long long level_current, level_next;
1336         int result = -EINVAL;
1337
1338         /* no warning message if acpi_backlight=vendor is used */
1339         if (!acpi_video_backlight_support())
1340                 return 0;
1341
1342         if (!device->brightness)
1343                 goto out;
1344
1345         result = acpi_video_device_lcd_get_level_current(device,
1346                                                          &level_current,
1347                                                          false);
1348         if (result)
1349                 goto out;
1350
1351         level_next = acpi_video_get_next_level(device, level_current, event);
1352
1353         result = acpi_video_device_lcd_set_level(device, level_next);
1354
1355         if (!result)
1356                 backlight_force_update(device->backlight,
1357                                        BACKLIGHT_UPDATE_HOTKEY);
1358
1359 out:
1360         if (result)
1361                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1362
1363         return result;
1364 }
1365
1366 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1367                         void **edid)
1368 {
1369         struct acpi_video_bus *video;
1370         struct acpi_video_device *video_device;
1371         union acpi_object *buffer = NULL;
1372         acpi_status status;
1373         int i, length;
1374
1375         if (!device || !acpi_driver_data(device))
1376                 return -EINVAL;
1377
1378         video = acpi_driver_data(device);
1379
1380         for (i = 0; i < video->attached_count; i++) {
1381                 video_device = video->attached_array[i].bind_info;
1382                 length = 256;
1383
1384                 if (!video_device)
1385                         continue;
1386
1387                 if (!video_device->cap._DDC)
1388                         continue;
1389
1390                 if (type) {
1391                         switch (type) {
1392                         case ACPI_VIDEO_DISPLAY_CRT:
1393                                 if (!video_device->flags.crt)
1394                                         continue;
1395                                 break;
1396                         case ACPI_VIDEO_DISPLAY_TV:
1397                                 if (!video_device->flags.tvout)
1398                                         continue;
1399                                 break;
1400                         case ACPI_VIDEO_DISPLAY_DVI:
1401                                 if (!video_device->flags.dvi)
1402                                         continue;
1403                                 break;
1404                         case ACPI_VIDEO_DISPLAY_LCD:
1405                                 if (!video_device->flags.lcd)
1406                                         continue;
1407                                 break;
1408                         }
1409                 } else if (video_device->device_id != device_id) {
1410                         continue;
1411                 }
1412
1413                 status = acpi_video_device_EDID(video_device, &buffer, length);
1414
1415                 if (ACPI_FAILURE(status) || !buffer ||
1416                     buffer->type != ACPI_TYPE_BUFFER) {
1417                         length = 128;
1418                         status = acpi_video_device_EDID(video_device, &buffer,
1419                                                         length);
1420                         if (ACPI_FAILURE(status) || !buffer ||
1421                             buffer->type != ACPI_TYPE_BUFFER) {
1422                                 continue;
1423                         }
1424                 }
1425
1426                 *edid = buffer->buffer.pointer;
1427                 return length;
1428         }
1429
1430         return -ENODEV;
1431 }
1432 EXPORT_SYMBOL(acpi_video_get_edid);
1433
1434 static int
1435 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1436                            struct acpi_device *device)
1437 {
1438         int status = 0;
1439         struct acpi_device *dev;
1440
1441         /*
1442          * There are systems where video module known to work fine regardless
1443          * of broken _DOD and ignoring returned value here doesn't cause
1444          * any issues later.
1445          */
1446         acpi_video_device_enumerate(video);
1447
1448         list_for_each_entry(dev, &device->children, node) {
1449
1450                 status = acpi_video_bus_get_one_device(dev, video);
1451                 if (status) {
1452                         dev_err(&dev->dev, "Can't attach device\n");
1453                         break;
1454                 }
1455         }
1456         return status;
1457 }
1458
1459 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1460 {
1461         acpi_status status;
1462
1463         if (!device || !device->video)
1464                 return -ENOENT;
1465
1466         if (device->flags.notify) {
1467                 status = acpi_remove_notify_handler(device->dev->handle,
1468                                 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1469                 if (ACPI_FAILURE(status))
1470                         dev_err(&device->dev->dev,
1471                                         "Can't remove video notify handler\n");
1472         }
1473
1474         if (device->backlight) {
1475                 backlight_device_unregister(device->backlight);
1476                 device->backlight = NULL;
1477         }
1478         if (device->cooling_dev) {
1479                 sysfs_remove_link(&device->dev->dev.kobj,
1480                                   "thermal_cooling");
1481                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1482                                   "device");
1483                 thermal_cooling_device_unregister(device->cooling_dev);
1484                 device->cooling_dev = NULL;
1485         }
1486
1487         return 0;
1488 }
1489
1490 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1491 {
1492         int status;
1493         struct acpi_video_device *dev, *next;
1494
1495         mutex_lock(&video->device_list_lock);
1496
1497         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1498
1499                 status = acpi_video_bus_put_one_device(dev);
1500                 if (ACPI_FAILURE(status))
1501                         printk(KERN_WARNING PREFIX
1502                                "hhuuhhuu bug in acpi video driver.\n");
1503
1504                 if (dev->brightness) {
1505                         kfree(dev->brightness->levels);
1506                         kfree(dev->brightness);
1507                 }
1508                 list_del(&dev->entry);
1509                 kfree(dev);
1510         }
1511
1512         mutex_unlock(&video->device_list_lock);
1513
1514         return 0;
1515 }
1516
1517 /* acpi_video interface */
1518
1519 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1520 {
1521         return acpi_video_bus_DOS(video, 0, 0);
1522 }
1523
1524 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1525 {
1526         return acpi_video_bus_DOS(video, 0, 1);
1527 }
1528
1529 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1530 {
1531         struct acpi_video_bus *video = acpi_driver_data(device);
1532         struct input_dev *input;
1533         int keycode = 0;
1534
1535         if (!video)
1536                 return;
1537
1538         input = video->input;
1539
1540         switch (event) {
1541         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1542                                          * most likely via hotkey. */
1543                 acpi_bus_generate_proc_event(device, event, 0);
1544                 keycode = KEY_SWITCHVIDEOMODE;
1545                 break;
1546
1547         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1548                                          * connector. */
1549                 acpi_video_device_enumerate(video);
1550                 acpi_video_device_rebind(video);
1551                 acpi_bus_generate_proc_event(device, event, 0);
1552                 keycode = KEY_SWITCHVIDEOMODE;
1553                 break;
1554
1555         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1556                 acpi_bus_generate_proc_event(device, event, 0);
1557                 keycode = KEY_SWITCHVIDEOMODE;
1558                 break;
1559         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1560                 acpi_bus_generate_proc_event(device, event, 0);
1561                 keycode = KEY_VIDEO_NEXT;
1562                 break;
1563         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1564                 acpi_bus_generate_proc_event(device, event, 0);
1565                 keycode = KEY_VIDEO_PREV;
1566                 break;
1567
1568         default:
1569                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1570                                   "Unsupported event [0x%x]\n", event));
1571                 break;
1572         }
1573
1574         if (acpi_notifier_call_chain(device, event, 0))
1575                 /* Something vetoed the keypress. */
1576                 keycode = 0;
1577
1578         if (keycode) {
1579                 input_report_key(input, keycode, 1);
1580                 input_sync(input);
1581                 input_report_key(input, keycode, 0);
1582                 input_sync(input);
1583         }
1584
1585         return;
1586 }
1587
1588 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1589 {
1590         struct acpi_video_device *video_device = data;
1591         struct acpi_device *device = NULL;
1592         struct acpi_video_bus *bus;
1593         struct input_dev *input;
1594         int keycode = 0;
1595
1596         if (!video_device)
1597                 return;
1598
1599         device = video_device->dev;
1600         bus = video_device->video;
1601         input = bus->input;
1602
1603         switch (event) {
1604         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1605                 if (brightness_switch_enabled)
1606                         acpi_video_switch_brightness(video_device, event);
1607                 acpi_bus_generate_proc_event(device, event, 0);
1608                 keycode = KEY_BRIGHTNESS_CYCLE;
1609                 break;
1610         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1611                 if (brightness_switch_enabled)
1612                         acpi_video_switch_brightness(video_device, event);
1613                 acpi_bus_generate_proc_event(device, event, 0);
1614                 keycode = KEY_BRIGHTNESSUP;
1615                 break;
1616         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1617                 if (brightness_switch_enabled)
1618                         acpi_video_switch_brightness(video_device, event);
1619                 acpi_bus_generate_proc_event(device, event, 0);
1620                 keycode = KEY_BRIGHTNESSDOWN;
1621                 break;
1622         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1623                 if (brightness_switch_enabled)
1624                         acpi_video_switch_brightness(video_device, event);
1625                 acpi_bus_generate_proc_event(device, event, 0);
1626                 keycode = KEY_BRIGHTNESS_ZERO;
1627                 break;
1628         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1629                 if (brightness_switch_enabled)
1630                         acpi_video_switch_brightness(video_device, event);
1631                 acpi_bus_generate_proc_event(device, event, 0);
1632                 keycode = KEY_DISPLAY_OFF;
1633                 break;
1634         default:
1635                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1636                                   "Unsupported event [0x%x]\n", event));
1637                 break;
1638         }
1639
1640         acpi_notifier_call_chain(device, event, 0);
1641
1642         if (keycode) {
1643                 input_report_key(input, keycode, 1);
1644                 input_sync(input);
1645                 input_report_key(input, keycode, 0);
1646                 input_sync(input);
1647         }
1648
1649         return;
1650 }
1651
1652 static int acpi_video_resume(struct notifier_block *nb,
1653                                 unsigned long val, void *ign)
1654 {
1655         struct acpi_video_bus *video;
1656         struct acpi_video_device *video_device;
1657         int i;
1658
1659         switch (val) {
1660         case PM_HIBERNATION_PREPARE:
1661         case PM_SUSPEND_PREPARE:
1662         case PM_RESTORE_PREPARE:
1663                 return NOTIFY_DONE;
1664         }
1665
1666         video = container_of(nb, struct acpi_video_bus, pm_nb);
1667
1668         dev_info(&video->device->dev, "Restoring backlight state\n");
1669
1670         for (i = 0; i < video->attached_count; i++) {
1671                 video_device = video->attached_array[i].bind_info;
1672                 if (video_device && video_device->backlight)
1673                         acpi_video_set_brightness(video_device->backlight);
1674         }
1675
1676         return NOTIFY_OK;
1677 }
1678
1679 static acpi_status
1680 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1681                         void **return_value)
1682 {
1683         struct acpi_device *device = context;
1684         struct acpi_device *sibling;
1685         int result;
1686
1687         if (handle == device->handle)
1688                 return AE_CTRL_TERMINATE;
1689
1690         result = acpi_bus_get_device(handle, &sibling);
1691         if (result)
1692                 return AE_OK;
1693
1694         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1695                         return AE_ALREADY_EXISTS;
1696
1697         return AE_OK;
1698 }
1699
1700 static int instance;
1701
1702 static int acpi_video_bus_add(struct acpi_device *device)
1703 {
1704         struct acpi_video_bus *video;
1705         struct input_dev *input;
1706         int error;
1707         acpi_status status;
1708
1709         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1710                                 device->parent->handle, 1,
1711                                 acpi_video_bus_match, NULL,
1712                                 device, NULL);
1713         if (status == AE_ALREADY_EXISTS) {
1714                 printk(KERN_WARNING FW_BUG
1715                         "Duplicate ACPI video bus devices for the"
1716                         " same VGA controller, please try module "
1717                         "parameter \"video.allow_duplicates=1\""
1718                         "if the current driver doesn't work.\n");
1719                 if (!allow_duplicates)
1720                         return -ENODEV;
1721         }
1722
1723         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1724         if (!video)
1725                 return -ENOMEM;
1726
1727         /* a hack to fix the duplicate name "VID" problem on T61 */
1728         if (!strcmp(device->pnp.bus_id, "VID")) {
1729                 if (instance)
1730                         device->pnp.bus_id[3] = '0' + instance;
1731                 instance ++;
1732         }
1733         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1734         if (!strcmp(device->pnp.bus_id, "VGA")) {
1735                 if (instance)
1736                         device->pnp.bus_id[3] = '0' + instance;
1737                 instance++;
1738         }
1739
1740         video->device = device;
1741         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1742         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1743         device->driver_data = video;
1744
1745         acpi_video_bus_find_cap(video);
1746         error = acpi_video_bus_check(video);
1747         if (error)
1748                 goto err_free_video;
1749
1750         mutex_init(&video->device_list_lock);
1751         INIT_LIST_HEAD(&video->video_device_list);
1752
1753         error = acpi_video_bus_get_devices(video, device);
1754         if (error)
1755                 goto err_put_video;
1756
1757         video->input = input = input_allocate_device();
1758         if (!input) {
1759                 error = -ENOMEM;
1760                 goto err_put_video;
1761         }
1762
1763         error = acpi_video_bus_start_devices(video);
1764         if (error)
1765                 goto err_free_input_dev;
1766
1767         snprintf(video->phys, sizeof(video->phys),
1768                 "%s/video/input0", acpi_device_hid(video->device));
1769
1770         input->name = acpi_device_name(video->device);
1771         input->phys = video->phys;
1772         input->id.bustype = BUS_HOST;
1773         input->id.product = 0x06;
1774         input->dev.parent = &device->dev;
1775         input->evbit[0] = BIT(EV_KEY);
1776         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1777         set_bit(KEY_VIDEO_NEXT, input->keybit);
1778         set_bit(KEY_VIDEO_PREV, input->keybit);
1779         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1780         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1781         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1782         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1783         set_bit(KEY_DISPLAY_OFF, input->keybit);
1784
1785         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1786                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1787                video->flags.multihead ? "yes" : "no",
1788                video->flags.rom ? "yes" : "no",
1789                video->flags.post ? "yes" : "no");
1790
1791         video->pm_nb.notifier_call = acpi_video_resume;
1792         video->pm_nb.priority = 0;
1793         error = register_pm_notifier(&video->pm_nb);
1794         if (error)
1795                 goto err_stop_video;
1796
1797         error = input_register_device(input);
1798         if (error)
1799                 goto err_unregister_pm_notifier;
1800
1801         return 0;
1802
1803  err_unregister_pm_notifier:
1804         unregister_pm_notifier(&video->pm_nb);
1805  err_stop_video:
1806         acpi_video_bus_stop_devices(video);
1807  err_free_input_dev:
1808         input_free_device(input);
1809  err_put_video:
1810         acpi_video_bus_put_devices(video);
1811         kfree(video->attached_array);
1812  err_free_video:
1813         kfree(video);
1814         device->driver_data = NULL;
1815
1816         return error;
1817 }
1818
1819 static int acpi_video_bus_remove(struct acpi_device *device)
1820 {
1821         struct acpi_video_bus *video = NULL;
1822
1823
1824         if (!device || !acpi_driver_data(device))
1825                 return -EINVAL;
1826
1827         video = acpi_driver_data(device);
1828
1829         unregister_pm_notifier(&video->pm_nb);
1830
1831         acpi_video_bus_stop_devices(video);
1832         acpi_video_bus_put_devices(video);
1833
1834         input_unregister_device(video->input);
1835         kfree(video->attached_array);
1836         kfree(video);
1837
1838         return 0;
1839 }
1840
1841 static int __init is_i740(struct pci_dev *dev)
1842 {
1843         if (dev->device == 0x00D1)
1844                 return 1;
1845         if (dev->device == 0x7000)
1846                 return 1;
1847         return 0;
1848 }
1849
1850 static int __init intel_opregion_present(void)
1851 {
1852         int opregion = 0;
1853         struct pci_dev *dev = NULL;
1854         u32 address;
1855
1856         for_each_pci_dev(dev) {
1857                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1858                         continue;
1859                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1860                         continue;
1861                 /* We don't want to poke around undefined i740 registers */
1862                 if (is_i740(dev))
1863                         continue;
1864                 pci_read_config_dword(dev, 0xfc, &address);
1865                 if (!address)
1866                         continue;
1867                 opregion = 1;
1868         }
1869         return opregion;
1870 }
1871
1872 int acpi_video_register(void)
1873 {
1874         int result = 0;
1875         if (register_count) {
1876                 /*
1877                  * if the function of acpi_video_register is already called,
1878                  * don't register the acpi_vide_bus again and return no error.
1879                  */
1880                 return 0;
1881         }
1882
1883         result = acpi_bus_register_driver(&acpi_video_bus);
1884         if (result < 0)
1885                 return -ENODEV;
1886
1887         /*
1888          * When the acpi_video_bus is loaded successfully, increase
1889          * the counter reference.
1890          */
1891         register_count = 1;
1892
1893         return 0;
1894 }
1895 EXPORT_SYMBOL(acpi_video_register);
1896
1897 void acpi_video_unregister(void)
1898 {
1899         if (!register_count) {
1900                 /*
1901                  * If the acpi video bus is already unloaded, don't
1902                  * unload it again and return directly.
1903                  */
1904                 return;
1905         }
1906         acpi_bus_unregister_driver(&acpi_video_bus);
1907
1908         register_count = 0;
1909
1910         return;
1911 }
1912 EXPORT_SYMBOL(acpi_video_unregister);
1913
1914 /*
1915  * This is kind of nasty. Hardware using Intel chipsets may require
1916  * the video opregion code to be run first in order to initialise
1917  * state before any ACPI video calls are made. To handle this we defer
1918  * registration of the video class until the opregion code has run.
1919  */
1920
1921 static int __init acpi_video_init(void)
1922 {
1923         dmi_check_system(video_dmi_table);
1924
1925         if (intel_opregion_present())
1926                 return 0;
1927
1928         return acpi_video_register();
1929 }
1930
1931 static void __exit acpi_video_exit(void)
1932 {
1933         acpi_video_unregister();
1934
1935         return;
1936 }
1937
1938 module_init(acpi_video_init);
1939 module_exit(acpi_video_exit);