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 Pavilion g6 Notebook PC",
 462          .matches = {
 463                  DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 464                  DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 465                 },
 466         },
 467         {
 468          .callback = video_ignore_initial_backlight,
 469          .ident = "HP 1000 Notebook PC",
 470          .matches = {
 471                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 472                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"),
 473                 },
 474         },
 475         {
 476          .callback = video_ignore_initial_backlight,
 477          .ident = "HP Pavilion m4",
 478          .matches = {
 479                 DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
 480                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"),
 481                 },
 482         },
 483         {}
 484 };
 485
 486 static unsigned long long
 487 acpi_video_bqc_value_to_level(struct acpi_video_device *device,
 488                               unsigned long long bqc_value)
 489 {
 490         unsigned long long level;
 491
 492         if (device->brightness->flags._BQC_use_index) {
 493                 /*
 494                  * _BQC returns an index that doesn't account for
 495                  * the first 2 items with special meaning, so we need
 496                  * to compensate for that by offsetting ourselves
 497                  */
 498                 if (device->brightness->flags._BCL_reversed)
 499                         bqc_value = device->brightness->count - 3 - bqc_value;
 500
 501                 level = device->brightness->levels[bqc_value + 2];
 502         } else {
 503                 level = bqc_value;
 504         }
 505
 506         level += bqc_offset_aml_bug_workaround;
 507
 508         return level;
 509 }
 510
 511 static int
 512 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
 513                                         unsigned long long *level, bool raw)
 514 {
 515         acpi_status status = AE_OK;
 516         int i;
 517
 518         if (device->cap._BQC || device->cap._BCQ) {
 519                 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
 520
 521                 status = acpi_evaluate_integer(device->dev->handle, buf,
 522                                                 NULL, level);
 523                 if (ACPI_SUCCESS(status)) {
 524                         if (raw) {
 525                                 /*
 526                                  * Caller has indicated he wants the raw
 527                                  * value returned by _BQC, so don't furtherly
 528                                  * mess with the value.
 529                                  */
 530                                 return 0;
 531                         }
 532
 533                         *level = acpi_video_bqc_value_to_level(device, *level);
 534
 535                         for (i = 2; i < device->brightness->count; i++)
 536                                 if (device->brightness->levels[i] == *level) {
 537                                         device->brightness->curr = *level;
 538                                         return 0;
 539                         }
 540                         /*
 541                          * BQC returned an invalid level.
 542                          * Stop using it.
 543                          */
 544                         ACPI_WARNING((AE_INFO,
 545                                       "%s returned an invalid level",
 546                                       buf));
 547                         device->cap._BQC = device->cap._BCQ = 0;
 548                 } else {
 549                         /* Fixme:
 550                          * should we return an error or ignore this failure?
 551                          * dev->brightness->curr is a cached value which stores
 552                          * the correct current backlight level in most cases.
 553                          * ACPI video backlight still works w/ buggy _BQC.
 554                          * http://bugzilla.kernel.org/show_bug.cgi?id=12233
 555                          */
 556                         ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
 557                         device->cap._BQC = device->cap._BCQ = 0;
 558                 }
 559         }
 560
 561         *level = device->brightness->curr;
 562         return 0;
 563 }
 564
 565 static int
 566 acpi_video_device_EDID(struct acpi_video_device *device,
 567                        union acpi_object **edid, ssize_t length)
 568 {
 569         int status;
 570         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 571         union acpi_object *obj;
 572         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 573         struct acpi_object_list args = { 1, &arg0 };
 574
 575
 576         *edid = NULL;
 577
 578         if (!device)
 579                 return -ENODEV;
 580         if (length == 128)
 581                 arg0.integer.value = 1;
 582         else if (length == 256)
 583                 arg0.integer.value = 2;
 584         else
 585                 return -EINVAL;
 586
 587         status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
 588         if (ACPI_FAILURE(status))
 589                 return -ENODEV;
 590
 591         obj = buffer.pointer;
 592
 593         if (obj && obj->type == ACPI_TYPE_BUFFER)
 594                 *edid = obj;
 595         else {
 596                 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
 597                 status = -EFAULT;
 598                 kfree(obj);
 599         }
 600
 601         return status;
 602 }
 603
 604 /* bus */
 605
 606 /*
 607  *  Arg:
 608  *      video           : video bus device pointer
 609  *      bios_flag       :
 610  *              0.      The system BIOS should NOT automatically switch(toggle)
 611  *                      the active display output.
 612  *              1.      The system BIOS should automatically switch (toggle) the
 613  *                      active display output. No switch event.
 614  *              2.      The _DGS value should be locked.
 615  *              3.      The system BIOS should not automatically switch (toggle) the
 616  *                      active display output, but instead generate the display switch
 617  *                      event notify code.
 618  *      lcd_flag        :
 619  *              0.      The system BIOS should automatically control the brightness level
 620  *                      of the LCD when the power changes from AC to DC
 621  *              1.      The system BIOS should NOT automatically control the brightness
 622  *                      level of the LCD when the power changes from AC to DC.
 623  * Return Value:
 624  *              -EINVAL wrong arg.
 625  */
 626
 627 static int
 628 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
 629 {
 630         acpi_status status;
 631         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 632         struct acpi_object_list args = { 1, &arg0 };
 633
 634         if (!video->cap._DOS)
 635                 return 0;
 636
 637         if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
 638                 return -EINVAL;
 639         arg0.integer.value = (lcd_flag << 2) | bios_flag;
 640         video->dos_setting = arg0.integer.value;
 641         status = acpi_evaluate_object(video->device->handle, "_DOS",
 642                 &args, NULL);
 643         if (ACPI_FAILURE(status))
 644                 return -EIO;
 645
 646         return 0;
 647 }
 648
 649 /*
 650  * Simple comparison function used to sort backlight levels.
 651  */
 652
 653 static int
 654 acpi_video_cmp_level(const void *a, const void *b)
 655 {
 656         return *(int *)a - *(int *)b;
 657 }
 658
 659 /*
 660  * Decides if _BQC/_BCQ for this system is usable
 661  *
 662  * We do this by changing the level first and then read out the current
 663  * brightness level, if the value does not match, find out if it is using
 664  * index. If not, clear the _BQC/_BCQ capability.
 665  */
 666 static int acpi_video_bqc_quirk(struct acpi_video_device *device,
 667                                 int max_level, int current_level)
 668 {
 669         struct acpi_video_device_brightness *br = device->brightness;
 670         int result;
 671         unsigned long long level;
 672         int test_level;
 673
 674         /* don't mess with existing known broken systems */
 675         if (bqc_offset_aml_bug_workaround)
 676                 return 0;
 677
 678         /*
 679          * Some systems always report current brightness level as maximum
 680          * through _BQC, we need to test another value for them.
 681          */
 682         test_level = current_level == max_level ? br->levels[2] : max_level;
 683
 684         result = acpi_video_device_lcd_set_level(device, test_level);
 685         if (result)
 686                 return result;
 687
 688         result = acpi_video_device_lcd_get_level_current(device, &level, true);
 689         if (result)
 690                 return result;
 691
 692         if (level != test_level) {
 693                 /* buggy _BQC found, need to find out if it uses index */
 694                 if (level < br->count) {
 695                         if (br->flags._BCL_reversed)
 696                                 level = br->count - 3 - level;
 697                         if (br->levels[level + 2] == test_level)
 698                                 br->flags._BQC_use_index = 1;
 699                 }
 700
 701                 if (!br->flags._BQC_use_index)
 702                         device->cap._BQC = device->cap._BCQ = 0;
 703         }
 704
 705         return 0;
 706 }
 707
 708
 709 /*
 710  *  Arg:
 711  *      device  : video output device (LCD, CRT, ..)
 712  *
 713  *  Return Value:
 714  *      Maximum brightness level
 715  *
 716  *  Allocate and initialize device->brightness.
 717  */
 718
 719 static int
 720 acpi_video_init_brightness(struct acpi_video_device *device)
 721 {
 722         union acpi_object *obj = NULL;
 723         int i, max_level = 0, count = 0, level_ac_battery = 0;
 724         unsigned long long level, level_old;
 725         union acpi_object *o;
 726         struct acpi_video_device_brightness *br = NULL;
 727         int result = -EINVAL;
 728
 729         if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
 730                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
 731                                                 "LCD brightness level\n"));
 732                 goto out;
 733         }
 734
 735         if (obj->package.count < 2)
 736                 goto out;
 737
 738         br = kzalloc(sizeof(*br), GFP_KERNEL);
 739         if (!br) {
 740                 printk(KERN_ERR "can't allocate memory\n");
 741                 result = -ENOMEM;
 742                 goto out;
 743         }
 744
 745         br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
 746                                 GFP_KERNEL);
 747         if (!br->levels) {
 748                 result = -ENOMEM;
 749                 goto out_free;
 750         }
 751
 752         for (i = 0; i < obj->package.count; i++) {
 753                 o = (union acpi_object *)&obj->package.elements[i];
 754                 if (o->type != ACPI_TYPE_INTEGER) {
 755                         printk(KERN_ERR PREFIX "Invalid data\n");
 756                         continue;
 757                 }
 758                 br->levels[count] = (u32) o->integer.value;
 759
 760                 if (br->levels[count] > max_level)
 761                         max_level = br->levels[count];
 762                 count++;
 763         }
 764
 765         /*
 766          * some buggy BIOS don't export the levels
 767          * when machine is on AC/Battery in _BCL package.
 768          * In this case, the first two elements in _BCL packages
 769          * are also supported brightness levels that OS should take care of.
 770          */
 771         for (i = 2; i < count; i++) {
 772                 if (br->levels[i] == br->levels[0])
 773                         level_ac_battery++;
 774                 if (br->levels[i] == br->levels[1])
 775                         level_ac_battery++;
 776         }
 777
 778         if (level_ac_battery < 2) {
 779                 level_ac_battery = 2 - level_ac_battery;
 780                 br->flags._BCL_no_ac_battery_levels = 1;
 781                 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
 782                         br->levels[i] = br->levels[i - level_ac_battery];
 783                 count += level_ac_battery;
 784         } else if (level_ac_battery > 2)
 785                 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
 786
 787         /* Check if the _BCL package is in a reversed order */
 788         if (max_level == br->levels[2]) {
 789                 br->flags._BCL_reversed = 1;
 790                 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
 791                         acpi_video_cmp_level, NULL);
 792         } else if (max_level != br->levels[count - 1])
 793                 ACPI_ERROR((AE_INFO,
 794                             "Found unordered _BCL package"));
 795
 796         br->count = count;
 797         device->brightness = br;
 798
 799         /* Check the input/output of _BQC/_BCL/_BCM */
 800         if ((max_level < 100) && (max_level <= (count - 2)))
 801                 br->flags._BCL_use_index = 1;
 802
 803         /*
 804          * _BCM is always consistent with _BCL,
 805          * at least for all the laptops we have ever seen.
 806          */
 807         br->flags._BCM_use_index = br->flags._BCL_use_index;
 808
 809         /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
 810         br->curr = level = max_level;
 811
 812         if (!device->cap._BQC)
 813                 goto set_level;
 814
 815         result = acpi_video_device_lcd_get_level_current(device,
 816                                                          &level_old, true);
 817         if (result)
 818                 goto out_free_levels;
 819
 820         result = acpi_video_bqc_quirk(device, max_level, level_old);
 821         if (result)
 822                 goto out_free_levels;
 823         /*
 824          * cap._BQC may get cleared due to _BQC is found to be broken
 825          * in acpi_video_bqc_quirk, so check again here.
 826          */
 827         if (!device->cap._BQC)
 828                 goto set_level;
 829
 830         if (use_bios_initial_backlight) {
 831                 level = acpi_video_bqc_value_to_level(device, level_old);
 832                 /*
 833                  * On some buggy laptops, _BQC returns an uninitialized
 834                  * value when invoked for the first time, i.e.
 835                  * level_old is invalid (no matter whether it's a level
 836                  * or an index). Set the backlight to max_level in this case.
 837                  */
 838                 for (i = 2; i < br->count; i++)
 839                         if (level_old == br->levels[i])
 840                                 break;
 841                 if (i == br->count)
 842                         level = max_level;
 843         }
 844
 845 set_level:
 846         result = acpi_video_device_lcd_set_level(device, level);
 847         if (result)
 848                 goto out_free_levels;
 849
 850         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 851                           "found %d brightness levels\n", count - 2));
 852         kfree(obj);
 853         return result;
 854
 855 out_free_levels:
 856         kfree(br->levels);
 857 out_free:
 858         kfree(br);
 859 out:
 860         device->brightness = NULL;
 861         kfree(obj);
 862         return result;
 863 }
 864
 865 /*
 866  *  Arg:
 867  *      device  : video output device (LCD, CRT, ..)
 868  *
 869  *  Return Value:
 870  *      None
 871  *
 872  *  Find out all required AML methods defined under the output
 873  *  device.
 874  */
 875
 876 static void acpi_video_device_find_cap(struct acpi_video_device *device)
 877 {
 878         acpi_handle h_dummy1;
 879
 880         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
 881                 device->cap._ADR = 1;
 882         }
 883         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
 884                 device->cap._BCL = 1;
 885         }
 886         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
 887                 device->cap._BCM = 1;
 888         }
 889         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
 890                 device->cap._BQC = 1;
 891         else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
 892                                 &h_dummy1))) {
 893                 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
 894                 device->cap._BCQ = 1;
 895         }
 896
 897         if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
 898                 device->cap._DDC = 1;
 899         }
 900
 901         if (acpi_video_backlight_support()) {
 902                 struct backlight_properties props;
 903                 struct pci_dev *pdev;
 904                 acpi_handle acpi_parent;
 905                 struct device *parent = NULL;
 906                 int result;
 907                 static int count = 0;
 908                 char *name;
 909
 910                 result = acpi_video_init_brightness(device);
 911                 if (result)
 912                         return;
 913                 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
 914                 if (!name)
 915                         return;
 916                 count++;
 917
 918                 acpi_get_parent(device->dev->handle, &acpi_parent);
 919
 920                 pdev = acpi_get_pci_dev(acpi_parent);
 921                 if (pdev) {
 922                         parent = &pdev->dev;
 923                         pci_dev_put(pdev);
 924                 }
 925
 926                 memset(&props, 0, sizeof(struct backlight_properties));
 927                 props.type = BACKLIGHT_FIRMWARE;
 928                 props.max_brightness = device->brightness->count - 3;
 929                 device->backlight = backlight_device_register(name,
 930                                                               parent,
 931                                                               device,
 932                                                               &acpi_backlight_ops,
 933                                                               &props);
 934                 kfree(name);
 935                 if (IS_ERR(device->backlight))
 936                         return;
 937
 938                 /*
 939                  * Save current brightness level in case we have to restore it
 940                  * before acpi_video_device_lcd_set_level() is called next time.
 941                  */
 942                 device->backlight->props.brightness =
 943                                 acpi_video_get_brightness(device->backlight);
 944
 945                 device->cooling_dev = thermal_cooling_device_register("LCD",
 946                                         device->dev, &video_cooling_ops);
 947                 if (IS_ERR(device->cooling_dev)) {
 948                         /*
 949                          * Set cooling_dev to NULL so we don't crash trying to
 950                          * free it.
 951                          * Also, why the hell we are returning early and
 952                          * not attempt to register video output if cooling
 953                          * device registration failed?
 954                          * -- dtor
 955                          */
 956                         device->cooling_dev = NULL;
 957                         return;
 958                 }
 959
 960                 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
 961                          device->cooling_dev->id);
 962                 result = sysfs_create_link(&device->dev->dev.kobj,
 963                                 &device->cooling_dev->device.kobj,
 964                                 "thermal_cooling");
 965                 if (result)
 966                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 967                 result = sysfs_create_link(&device->cooling_dev->device.kobj,
 968                                 &device->dev->dev.kobj, "device");
 969                 if (result)
 970                         printk(KERN_ERR PREFIX "Create sysfs link\n");
 971
 972         }
 973 }
 974
 975 /*
 976  *  Arg:
 977  *      device  : video output device (VGA)
 978  *
 979  *  Return Value:
 980  *      None
 981  *
 982  *  Find out all required AML methods defined under the video bus device.
 983  */
 984
 985 static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 986 {
 987         acpi_handle h_dummy1;
 988
 989         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
 990                 video->cap._DOS = 1;
 991         }
 992         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
 993                 video->cap._DOD = 1;
 994         }
 995         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
 996                 video->cap._ROM = 1;
 997         }
 998         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
 999                 video->cap._GPD = 1;
1000         }
1001         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
1002                 video->cap._SPD = 1;
1003         }
1004         if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
1005                 video->cap._VPO = 1;
1006         }
1007 }
1008
1009 /*
1010  * Check whether the video bus device has required AML method to
1011  * support the desired features
1012  */
1013
1014 static int acpi_video_bus_check(struct acpi_video_bus *video)
1015 {
1016         acpi_status status = -ENOENT;
1017         struct pci_dev *dev;
1018
1019         if (!video)
1020                 return -EINVAL;
1021
1022         dev = acpi_get_pci_dev(video->device->handle);
1023         if (!dev)
1024                 return -ENODEV;
1025         pci_dev_put(dev);
1026
1027         /* Since there is no HID, CID and so on for VGA driver, we have
1028          * to check well known required nodes.
1029          */
1030
1031         /* Does this device support video switching? */
1032         if (video->cap._DOS || video->cap._DOD) {
1033                 if (!video->cap._DOS) {
1034                         printk(KERN_WARNING FW_BUG
1035                                 "ACPI(%s) defines _DOD but not _DOS\n",
1036                                 acpi_device_bid(video->device));
1037                 }
1038                 video->flags.multihead = 1;
1039                 status = 0;
1040         }
1041
1042         /* Does this device support retrieving a video ROM? */
1043         if (video->cap._ROM) {
1044                 video->flags.rom = 1;
1045                 status = 0;
1046         }
1047
1048         /* Does this device support configuring which video device to POST? */
1049         if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
1050                 video->flags.post = 1;
1051                 status = 0;
1052         }
1053
1054         return status;
1055 }
1056
1057 /* --------------------------------------------------------------------------
1058                                  Driver Interface
1059    -------------------------------------------------------------------------- */
1060
1061 /* device interface */
1062 static struct acpi_video_device_attrib*
1063 acpi_video_get_device_attr(struct acpi_video_bus *video, 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.attrib;
1072         }
1073
1074         return NULL;
1075 }
1076
1077 static int
1078 acpi_video_get_device_type(struct acpi_video_bus *video,
1079                            unsigned long device_id)
1080 {
1081         struct acpi_video_enumerated_device *ids;
1082         int i;
1083
1084         for (i = 0; i < video->attached_count; i++) {
1085                 ids = &video->attached_array[i];
1086                 if ((ids->value.int_val & 0xffff) == device_id)
1087                         return ids->value.int_val;
1088         }
1089
1090         return 0;
1091 }
1092
1093 static int
1094 acpi_video_bus_get_one_device(struct acpi_device *device,
1095                               struct acpi_video_bus *video)
1096 {
1097         unsigned long long device_id;
1098         int status, device_type;
1099         struct acpi_video_device *data;
1100         struct acpi_video_device_attrib* attribute;
1101
1102         status =
1103             acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
1104         /* Some device omits _ADR, we skip them instead of fail */
1105         if (ACPI_FAILURE(status))
1106                 return 0;
1107
1108         data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1109         if (!data)
1110                 return -ENOMEM;
1111
1112         strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1113         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1114         device->driver_data = data;
1115
1116         data->device_id = device_id;
1117         data->video = video;
1118         data->dev = device;
1119
1120         attribute = acpi_video_get_device_attr(video, device_id);
1121
1122         if((attribute != NULL) && attribute->device_id_scheme) {
1123                 switch (attribute->display_type) {
1124                 case ACPI_VIDEO_DISPLAY_CRT:
1125                         data->flags.crt = 1;
1126                         break;
1127                 case ACPI_VIDEO_DISPLAY_TV:
1128                         data->flags.tvout = 1;
1129                         break;
1130                 case ACPI_VIDEO_DISPLAY_DVI:
1131                         data->flags.dvi = 1;
1132                         break;
1133                 case ACPI_VIDEO_DISPLAY_LCD:
1134                         data->flags.lcd = 1;
1135                         break;
1136                 default:
1137                         data->flags.unknown = 1;
1138                         break;
1139                 }
1140                 if(attribute->bios_can_detect)
1141                         data->flags.bios = 1;
1142         } else {
1143                 /* Check for legacy IDs */
1144                 device_type = acpi_video_get_device_type(video, device_id);
1145                 /* Ignore bits 16 and 18-20 */
1146                 switch (device_type & 0xffe2ffff) {
1147                         case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1148                                 data->flags.crt = 1;
1149                                 break;
1150                         case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1151                                 data->flags.lcd = 1;
1152                                 break;
1153                         case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1154                                 data->flags.tvout = 1;
1155                                 break;
1156                         default:
1157                                 data->flags.unknown = 1;
1158                 }
1159         }
1160
1161         acpi_video_device_bind(video, data);
1162         acpi_video_device_find_cap(data);
1163
1164         status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
1165                                              acpi_video_device_notify, data);
1166         if (ACPI_FAILURE(status))
1167                 dev_err(&device->dev, "Error installing notify handler\n");
1168         else
1169                 data->flags.notify = 1;
1170
1171         mutex_lock(&video->device_list_lock);
1172         list_add_tail(&data->entry, &video->video_device_list);
1173         mutex_unlock(&video->device_list_lock);
1174
1175         return status;
1176 }
1177
1178 /*
1179  *  Arg:
1180  *      video   : video bus device
1181  *
1182  *  Return:
1183  *      none
1184  *
1185  *  Enumerate the video device list of the video bus,
1186  *  bind the ids with the corresponding video devices
1187  *  under the video bus.
1188  */
1189
1190 static void acpi_video_device_rebind(struct acpi_video_bus *video)
1191 {
1192         struct acpi_video_device *dev;
1193
1194         mutex_lock(&video->device_list_lock);
1195
1196         list_for_each_entry(dev, &video->video_device_list, entry)
1197                 acpi_video_device_bind(video, dev);
1198
1199         mutex_unlock(&video->device_list_lock);
1200 }
1201
1202 /*
1203  *  Arg:
1204  *      video   : video bus device
1205  *      device  : video output device under the video
1206  *              bus
1207  *
1208  *  Return:
1209  *      none
1210  *
1211  *  Bind the ids with the corresponding video devices
1212  *  under the video bus.
1213  */
1214
1215 static void
1216 acpi_video_device_bind(struct acpi_video_bus *video,
1217                        struct acpi_video_device *device)
1218 {
1219         struct acpi_video_enumerated_device *ids;
1220         int i;
1221
1222         for (i = 0; i < video->attached_count; i++) {
1223                 ids = &video->attached_array[i];
1224                 if (device->device_id == (ids->value.int_val & 0xffff)) {
1225                         ids->bind_info = device;
1226                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1227                 }
1228         }
1229 }
1230
1231 /*
1232  *  Arg:
1233  *      video   : video bus device
1234  *
1235  *  Return:
1236  *      < 0     : error
1237  *
1238  *  Call _DOD to enumerate all devices attached to display adapter
1239  *
1240  */
1241
1242 static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1243 {
1244         int status;
1245         int count;
1246         int i;
1247         struct acpi_video_enumerated_device *active_list;
1248         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1249         union acpi_object *dod = NULL;
1250         union acpi_object *obj;
1251
1252         status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
1253         if (!ACPI_SUCCESS(status)) {
1254                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1255                 return status;
1256         }
1257
1258         dod = buffer.pointer;
1259         if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1260                 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
1261                 status = -EFAULT;
1262                 goto out;
1263         }
1264
1265         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
1266                           dod->package.count));
1267
1268         active_list = kcalloc(1 + dod->package.count,
1269                               sizeof(struct acpi_video_enumerated_device),
1270                               GFP_KERNEL);
1271         if (!active_list) {
1272                 status = -ENOMEM;
1273                 goto out;
1274         }
1275
1276         count = 0;
1277         for (i = 0; i < dod->package.count; i++) {
1278                 obj = &dod->package.elements[i];
1279
1280                 if (obj->type != ACPI_TYPE_INTEGER) {
1281                         printk(KERN_ERR PREFIX
1282                                 "Invalid _DOD data in element %d\n", i);
1283                         continue;
1284                 }
1285
1286                 active_list[count].value.int_val = obj->integer.value;
1287                 active_list[count].bind_info = NULL;
1288                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1289                                   (int)obj->integer.value));
1290                 count++;
1291         }
1292
1293         kfree(video->attached_array);
1294
1295         video->attached_array = active_list;
1296         video->attached_count = count;
1297
1298  out:
1299         kfree(buffer.pointer);
1300         return status;
1301 }
1302
1303 static int
1304 acpi_video_get_next_level(struct acpi_video_device *device,
1305                           u32 level_current, u32 event)
1306 {
1307         int min, max, min_above, max_below, i, l, delta = 255;
1308         max = max_below = 0;
1309         min = min_above = 255;
1310         /* Find closest level to level_current */
1311         for (i = 2; i < device->brightness->count; i++) {
1312                 l = device->brightness->levels[i];
1313                 if (abs(l - level_current) < abs(delta)) {
1314                         delta = l - level_current;
1315                         if (!delta)
1316                                 break;
1317                 }
1318         }
1319         /* Ajust level_current to closest available level */
1320         level_current += delta;
1321         for (i = 2; i < device->brightness->count; i++) {
1322                 l = device->brightness->levels[i];
1323                 if (l < min)
1324                         min = l;
1325                 if (l > max)
1326                         max = l;
1327                 if (l < min_above && l > level_current)
1328                         min_above = l;
1329                 if (l > max_below && l < level_current)
1330                         max_below = l;
1331         }
1332
1333         switch (event) {
1334         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1335                 return (level_current < max) ? min_above : min;
1336         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1337                 return (level_current < max) ? min_above : max;
1338         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1339                 return (level_current > min) ? max_below : min;
1340         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1341         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1342                 return 0;
1343         default:
1344                 return level_current;
1345         }
1346 }
1347
1348 static int
1349 acpi_video_switch_brightness(struct acpi_video_device *device, int event)
1350 {
1351         unsigned long long level_current, level_next;
1352         int result = -EINVAL;
1353
1354         /* no warning message if acpi_backlight=vendor is used */
1355         if (!acpi_video_backlight_support())
1356                 return 0;
1357
1358         if (!device->brightness)
1359                 goto out;
1360
1361         result = acpi_video_device_lcd_get_level_current(device,
1362                                                          &level_current,
1363                                                          false);
1364         if (result)
1365                 goto out;
1366
1367         level_next = acpi_video_get_next_level(device, level_current, event);
1368
1369         result = acpi_video_device_lcd_set_level(device, level_next);
1370
1371         if (!result)
1372                 backlight_force_update(device->backlight,
1373                                        BACKLIGHT_UPDATE_HOTKEY);
1374
1375 out:
1376         if (result)
1377                 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1378
1379         return result;
1380 }
1381
1382 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1383                         void **edid)
1384 {
1385         struct acpi_video_bus *video;
1386         struct acpi_video_device *video_device;
1387         union acpi_object *buffer = NULL;
1388         acpi_status status;
1389         int i, length;
1390
1391         if (!device || !acpi_driver_data(device))
1392                 return -EINVAL;
1393
1394         video = acpi_driver_data(device);
1395
1396         for (i = 0; i < video->attached_count; i++) {
1397                 video_device = video->attached_array[i].bind_info;
1398                 length = 256;
1399
1400                 if (!video_device)
1401                         continue;
1402
1403                 if (!video_device->cap._DDC)
1404                         continue;
1405
1406                 if (type) {
1407                         switch (type) {
1408                         case ACPI_VIDEO_DISPLAY_CRT:
1409                                 if (!video_device->flags.crt)
1410                                         continue;
1411                                 break;
1412                         case ACPI_VIDEO_DISPLAY_TV:
1413                                 if (!video_device->flags.tvout)
1414                                         continue;
1415                                 break;
1416                         case ACPI_VIDEO_DISPLAY_DVI:
1417                                 if (!video_device->flags.dvi)
1418                                         continue;
1419                                 break;
1420                         case ACPI_VIDEO_DISPLAY_LCD:
1421                                 if (!video_device->flags.lcd)
1422                                         continue;
1423                                 break;
1424                         }
1425                 } else if (video_device->device_id != device_id) {
1426                         continue;
1427                 }
1428
1429                 status = acpi_video_device_EDID(video_device, &buffer, length);
1430
1431                 if (ACPI_FAILURE(status) || !buffer ||
1432                     buffer->type != ACPI_TYPE_BUFFER) {
1433                         length = 128;
1434                         status = acpi_video_device_EDID(video_device, &buffer,
1435                                                         length);
1436                         if (ACPI_FAILURE(status) || !buffer ||
1437                             buffer->type != ACPI_TYPE_BUFFER) {
1438                                 continue;
1439                         }
1440                 }
1441
1442                 *edid = buffer->buffer.pointer;
1443                 return length;
1444         }
1445
1446         return -ENODEV;
1447 }
1448 EXPORT_SYMBOL(acpi_video_get_edid);
1449
1450 static int
1451 acpi_video_bus_get_devices(struct acpi_video_bus *video,
1452                            struct acpi_device *device)
1453 {
1454         int status = 0;
1455         struct acpi_device *dev;
1456
1457         /*
1458          * There are systems where video module known to work fine regardless
1459          * of broken _DOD and ignoring returned value here doesn't cause
1460          * any issues later.
1461          */
1462         acpi_video_device_enumerate(video);
1463
1464         list_for_each_entry(dev, &device->children, node) {
1465
1466                 status = acpi_video_bus_get_one_device(dev, video);
1467                 if (status) {
1468                         dev_err(&dev->dev, "Can't attach device\n");
1469                         break;
1470                 }
1471         }
1472         return status;
1473 }
1474
1475 static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
1476 {
1477         acpi_status status;
1478
1479         if (!device || !device->video)
1480                 return -ENOENT;
1481
1482         if (device->flags.notify) {
1483                 status = acpi_remove_notify_handler(device->dev->handle,
1484                                 ACPI_DEVICE_NOTIFY, acpi_video_device_notify);
1485                 if (ACPI_FAILURE(status))
1486                         dev_err(&device->dev->dev,
1487                                         "Can't remove video notify handler\n");
1488         }
1489
1490         if (device->backlight) {
1491                 backlight_device_unregister(device->backlight);
1492                 device->backlight = NULL;
1493         }
1494         if (device->cooling_dev) {
1495                 sysfs_remove_link(&device->dev->dev.kobj,
1496                                   "thermal_cooling");
1497                 sysfs_remove_link(&device->cooling_dev->device.kobj,
1498                                   "device");
1499                 thermal_cooling_device_unregister(device->cooling_dev);
1500                 device->cooling_dev = NULL;
1501         }
1502
1503         return 0;
1504 }
1505
1506 static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1507 {
1508         int status;
1509         struct acpi_video_device *dev, *next;
1510
1511         mutex_lock(&video->device_list_lock);
1512
1513         list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1514
1515                 status = acpi_video_bus_put_one_device(dev);
1516                 if (ACPI_FAILURE(status))
1517                         printk(KERN_WARNING PREFIX
1518                                "hhuuhhuu bug in acpi video driver.\n");
1519
1520                 if (dev->brightness) {
1521                         kfree(dev->brightness->levels);
1522                         kfree(dev->brightness);
1523                 }
1524                 list_del(&dev->entry);
1525                 kfree(dev);
1526         }
1527
1528         mutex_unlock(&video->device_list_lock);
1529
1530         return 0;
1531 }
1532
1533 /* acpi_video interface */
1534
1535 static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
1536 {
1537         return acpi_video_bus_DOS(video, 0, 0);
1538 }
1539
1540 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
1541 {
1542         return acpi_video_bus_DOS(video, 0, 1);
1543 }
1544
1545 static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
1546 {
1547         struct acpi_video_bus *video = acpi_driver_data(device);
1548         struct input_dev *input;
1549         int keycode = 0;
1550
1551         if (!video)
1552                 return;
1553
1554         input = video->input;
1555
1556         switch (event) {
1557         case ACPI_VIDEO_NOTIFY_SWITCH:  /* User requested a switch,
1558                                          * most likely via hotkey. */
1559                 acpi_bus_generate_proc_event(device, event, 0);
1560                 keycode = KEY_SWITCHVIDEOMODE;
1561                 break;
1562
1563         case ACPI_VIDEO_NOTIFY_PROBE:   /* User plugged in or removed a video
1564                                          * connector. */
1565                 acpi_video_device_enumerate(video);
1566                 acpi_video_device_rebind(video);
1567                 acpi_bus_generate_proc_event(device, event, 0);
1568                 keycode = KEY_SWITCHVIDEOMODE;
1569                 break;
1570
1571         case ACPI_VIDEO_NOTIFY_CYCLE:   /* Cycle Display output hotkey pressed. */
1572                 acpi_bus_generate_proc_event(device, event, 0);
1573                 keycode = KEY_SWITCHVIDEOMODE;
1574                 break;
1575         case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:     /* Next Display output hotkey pressed. */
1576                 acpi_bus_generate_proc_event(device, event, 0);
1577                 keycode = KEY_VIDEO_NEXT;
1578                 break;
1579         case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:     /* previous Display output hotkey pressed. */
1580                 acpi_bus_generate_proc_event(device, event, 0);
1581                 keycode = KEY_VIDEO_PREV;
1582                 break;
1583
1584         default:
1585                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1586                                   "Unsupported event [0x%x]\n", event));
1587                 break;
1588         }
1589
1590         if (acpi_notifier_call_chain(device, event, 0))
1591                 /* Something vetoed the keypress. */
1592                 keycode = 0;
1593
1594         if (keycode) {
1595                 input_report_key(input, keycode, 1);
1596                 input_sync(input);
1597                 input_report_key(input, keycode, 0);
1598                 input_sync(input);
1599         }
1600
1601         return;
1602 }
1603
1604 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
1605 {
1606         struct acpi_video_device *video_device = data;
1607         struct acpi_device *device = NULL;
1608         struct acpi_video_bus *bus;
1609         struct input_dev *input;
1610         int keycode = 0;
1611
1612         if (!video_device)
1613                 return;
1614
1615         device = video_device->dev;
1616         bus = video_device->video;
1617         input = bus->input;
1618
1619         switch (event) {
1620         case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:        /* Cycle brightness */
1621                 if (brightness_switch_enabled)
1622                         acpi_video_switch_brightness(video_device, event);
1623                 acpi_bus_generate_proc_event(device, event, 0);
1624                 keycode = KEY_BRIGHTNESS_CYCLE;
1625                 break;
1626         case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:  /* Increase brightness */
1627                 if (brightness_switch_enabled)
1628                         acpi_video_switch_brightness(video_device, event);
1629                 acpi_bus_generate_proc_event(device, event, 0);
1630                 keycode = KEY_BRIGHTNESSUP;
1631                 break;
1632         case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:  /* Decrease brightness */
1633                 if (brightness_switch_enabled)
1634                         acpi_video_switch_brightness(video_device, event);
1635                 acpi_bus_generate_proc_event(device, event, 0);
1636                 keycode = KEY_BRIGHTNESSDOWN;
1637                 break;
1638         case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
1639                 if (brightness_switch_enabled)
1640                         acpi_video_switch_brightness(video_device, event);
1641                 acpi_bus_generate_proc_event(device, event, 0);
1642                 keycode = KEY_BRIGHTNESS_ZERO;
1643                 break;
1644         case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:     /* display device off */
1645                 if (brightness_switch_enabled)
1646                         acpi_video_switch_brightness(video_device, event);
1647                 acpi_bus_generate_proc_event(device, event, 0);
1648                 keycode = KEY_DISPLAY_OFF;
1649                 break;
1650         default:
1651                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1652                                   "Unsupported event [0x%x]\n", event));
1653                 break;
1654         }
1655
1656         acpi_notifier_call_chain(device, event, 0);
1657
1658         if (keycode) {
1659                 input_report_key(input, keycode, 1);
1660                 input_sync(input);
1661                 input_report_key(input, keycode, 0);
1662                 input_sync(input);
1663         }
1664
1665         return;
1666 }
1667
1668 static int acpi_video_resume(struct notifier_block *nb,
1669                                 unsigned long val, void *ign)
1670 {
1671         struct acpi_video_bus *video;
1672         struct acpi_video_device *video_device;
1673         int i;
1674
1675         switch (val) {
1676         case PM_HIBERNATION_PREPARE:
1677         case PM_SUSPEND_PREPARE:
1678         case PM_RESTORE_PREPARE:
1679                 return NOTIFY_DONE;
1680         }
1681
1682         video = container_of(nb, struct acpi_video_bus, pm_nb);
1683
1684         dev_info(&video->device->dev, "Restoring backlight state\n");
1685
1686         for (i = 0; i < video->attached_count; i++) {
1687                 video_device = video->attached_array[i].bind_info;
1688                 if (video_device && video_device->backlight)
1689                         acpi_video_set_brightness(video_device->backlight);
1690         }
1691
1692         return NOTIFY_OK;
1693 }
1694
1695 static acpi_status
1696 acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1697                         void **return_value)
1698 {
1699         struct acpi_device *device = context;
1700         struct acpi_device *sibling;
1701         int result;
1702
1703         if (handle == device->handle)
1704                 return AE_CTRL_TERMINATE;
1705
1706         result = acpi_bus_get_device(handle, &sibling);
1707         if (result)
1708                 return AE_OK;
1709
1710         if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1711                         return AE_ALREADY_EXISTS;
1712
1713         return AE_OK;
1714 }
1715
1716 static int instance;
1717
1718 static int acpi_video_bus_add(struct acpi_device *device)
1719 {
1720         struct acpi_video_bus *video;
1721         struct input_dev *input;
1722         int error;
1723         acpi_status status;
1724
1725         if (device->handler)
1726                 return -EINVAL;
1727
1728         status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1729                                 device->parent->handle, 1,
1730                                 acpi_video_bus_match, NULL,
1731                                 device, NULL);
1732         if (status == AE_ALREADY_EXISTS) {
1733                 printk(KERN_WARNING FW_BUG
1734                         "Duplicate ACPI video bus devices for the"
1735                         " same VGA controller, please try module "
1736                         "parameter \"video.allow_duplicates=1\""
1737                         "if the current driver doesn't work.\n");
1738                 if (!allow_duplicates)
1739                         return -ENODEV;
1740         }
1741
1742         video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
1743         if (!video)
1744                 return -ENOMEM;
1745
1746         /* a hack to fix the duplicate name "VID" problem on T61 */
1747         if (!strcmp(device->pnp.bus_id, "VID")) {
1748                 if (instance)
1749                         device->pnp.bus_id[3] = '0' + instance;
1750                 instance ++;
1751         }
1752         /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1753         if (!strcmp(device->pnp.bus_id, "VGA")) {
1754                 if (instance)
1755                         device->pnp.bus_id[3] = '0' + instance;
1756                 instance++;
1757         }
1758
1759         video->device = device;
1760         strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1761         strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1762         device->driver_data = video;
1763
1764         acpi_video_bus_find_cap(video);
1765         error = acpi_video_bus_check(video);
1766         if (error)
1767                 goto err_free_video;
1768
1769         mutex_init(&video->device_list_lock);
1770         INIT_LIST_HEAD(&video->video_device_list);
1771
1772         error = acpi_video_bus_get_devices(video, device);
1773         if (error)
1774                 goto err_put_video;
1775
1776         video->input = input = input_allocate_device();
1777         if (!input) {
1778                 error = -ENOMEM;
1779                 goto err_put_video;
1780         }
1781
1782         error = acpi_video_bus_start_devices(video);
1783         if (error)
1784                 goto err_free_input_dev;
1785
1786         snprintf(video->phys, sizeof(video->phys),
1787                 "%s/video/input0", acpi_device_hid(video->device));
1788
1789         input->name = acpi_device_name(video->device);
1790         input->phys = video->phys;
1791         input->id.bustype = BUS_HOST;
1792         input->id.product = 0x06;
1793         input->dev.parent = &device->dev;
1794         input->evbit[0] = BIT(EV_KEY);
1795         set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1796         set_bit(KEY_VIDEO_NEXT, input->keybit);
1797         set_bit(KEY_VIDEO_PREV, input->keybit);
1798         set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1799         set_bit(KEY_BRIGHTNESSUP, input->keybit);
1800         set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1801         set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1802         set_bit(KEY_DISPLAY_OFF, input->keybit);
1803
1804         printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
1805                ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1806                video->flags.multihead ? "yes" : "no",
1807                video->flags.rom ? "yes" : "no",
1808                video->flags.post ? "yes" : "no");
1809
1810         video->pm_nb.notifier_call = acpi_video_resume;
1811         video->pm_nb.priority = 0;
1812         error = register_pm_notifier(&video->pm_nb);
1813         if (error)
1814                 goto err_stop_video;
1815
1816         error = input_register_device(input);
1817         if (error)
1818                 goto err_unregister_pm_notifier;
1819
1820         return 0;
1821
1822  err_unregister_pm_notifier:
1823         unregister_pm_notifier(&video->pm_nb);
1824  err_stop_video:
1825         acpi_video_bus_stop_devices(video);
1826  err_free_input_dev:
1827         input_free_device(input);
1828  err_put_video:
1829         acpi_video_bus_put_devices(video);
1830         kfree(video->attached_array);
1831  err_free_video:
1832         kfree(video);
1833         device->driver_data = NULL;
1834
1835         return error;
1836 }
1837
1838 static int acpi_video_bus_remove(struct acpi_device *device)
1839 {
1840         struct acpi_video_bus *video = NULL;
1841
1842
1843         if (!device || !acpi_driver_data(device))
1844                 return -EINVAL;
1845
1846         video = acpi_driver_data(device);
1847
1848         unregister_pm_notifier(&video->pm_nb);
1849
1850         acpi_video_bus_stop_devices(video);
1851         acpi_video_bus_put_devices(video);
1852
1853         input_unregister_device(video->input);
1854         kfree(video->attached_array);
1855         kfree(video);
1856
1857         return 0;
1858 }
1859
1860 static int __init is_i740(struct pci_dev *dev)
1861 {
1862         if (dev->device == 0x00D1)
1863                 return 1;
1864         if (dev->device == 0x7000)
1865                 return 1;
1866         return 0;
1867 }
1868
1869 static int __init intel_opregion_present(void)
1870 {
1871         int opregion = 0;
1872         struct pci_dev *dev = NULL;
1873         u32 address;
1874
1875         for_each_pci_dev(dev) {
1876                 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1877                         continue;
1878                 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1879                         continue;
1880                 /* We don't want to poke around undefined i740 registers */
1881                 if (is_i740(dev))
1882                         continue;
1883                 pci_read_config_dword(dev, 0xfc, &address);
1884                 if (!address)
1885                         continue;
1886                 opregion = 1;
1887         }
1888         return opregion;
1889 }
1890
1891 int acpi_video_register(void)
1892 {
1893         int result = 0;
1894         if (register_count) {
1895                 /*
1896                  * if the function of acpi_video_register is already called,
1897                  * don't register the acpi_vide_bus again and return no error.
1898                  */
1899                 return 0;
1900         }
1901
1902         result = acpi_bus_register_driver(&acpi_video_bus);
1903         if (result < 0)
1904                 return -ENODEV;
1905
1906         /*
1907          * When the acpi_video_bus is loaded successfully, increase
1908          * the counter reference.
1909          */
1910         register_count = 1;
1911
1912         return 0;
1913 }
1914 EXPORT_SYMBOL(acpi_video_register);
1915
1916 void acpi_video_unregister(void)
1917 {
1918         if (!register_count) {
1919                 /*
1920                  * If the acpi video bus is already unloaded, don't
1921                  * unload it again and return directly.
1922                  */
1923                 return;
1924         }
1925         acpi_bus_unregister_driver(&acpi_video_bus);
1926
1927         register_count = 0;
1928
1929         return;
1930 }
1931 EXPORT_SYMBOL(acpi_video_unregister);
1932
1933 /*
1934  * This is kind of nasty. Hardware using Intel chipsets may require
1935  * the video opregion code to be run first in order to initialise
1936  * state before any ACPI video calls are made. To handle this we defer
1937  * registration of the video class until the opregion code has run.
1938  */
1939
1940 static int __init acpi_video_init(void)
1941 {
1942         dmi_check_system(video_dmi_table);
1943
1944         if (intel_opregion_present())
1945                 return 0;
1946
1947         return acpi_video_register();
1948 }
1949
1950 static void __exit acpi_video_exit(void)
1951 {
1952         acpi_video_unregister();
1953
1954         return;
1955 }
1956
1957 module_init(acpi_video_init);
1958 module_exit(acpi_video_exit);