1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * video.c - ACPI Video Driver 4 * 5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> 6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org> 7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net> 8 */ 9 10#define pr_fmt(fmt) "ACPI: video: " fmt 11 12#include <linux/kernel.h> 13#include <linux/module.h> 14#include <linux/init.h> 15#include <linux/types.h> 16#include <linux/list.h> 17#include <linux/mutex.h> 18#include <linux/input.h> 19#include <linux/backlight.h> 20#include <linux/thermal.h> 21#include <linux/sort.h> 22#include <linux/pci.h> 23#include <linux/pci_ids.h> 24#include <linux/slab.h> 25#include <linux/dmi.h> 26#include <linux/suspend.h> 27#include <linux/acpi.h> 28#include <acpi/video.h> 29#include <linux/uaccess.h> 30 31#define ACPI_VIDEO_BUS_NAME "Video Bus" 32#define ACPI_VIDEO_DEVICE_NAME "Video Device" 33 34#define MAX_NAME_LEN 20 35 36MODULE_AUTHOR("Bruno Ducrot"); 37MODULE_DESCRIPTION("ACPI Video Driver"); 38MODULE_LICENSE("GPL"); 39 40static bool brightness_switch_enabled = true; 41module_param(brightness_switch_enabled, bool, 0644); 42 43/* 44 * By default, we don't allow duplicate ACPI video bus devices 45 * under the same VGA controller 46 */ 47static bool allow_duplicates; 48module_param(allow_duplicates, bool, 0644); 49 50#define REPORT_OUTPUT_KEY_EVENTS 0x01 51#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 52static int report_key_events = -1; 53module_param(report_key_events, int, 0644); 54MODULE_PARM_DESC(report_key_events, 55 "0: none, 1: output changes, 2: brightness changes, 3: all"); 56 57static int hw_changes_brightness = -1; 58module_param(hw_changes_brightness, int, 0644); 59MODULE_PARM_DESC(hw_changes_brightness, 60 "Set this to 1 on buggy hw which changes the brightness itself when " 61 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); 62 63/* 64 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 65 * assumed even if not actually set. 66 */ 67static bool device_id_scheme = false; 68module_param(device_id_scheme, bool, 0444); 69 70static int only_lcd = -1; 71module_param(only_lcd, int, 0444); 72 73static bool may_report_brightness_keys; 74static int register_count; 75static DEFINE_MUTEX(register_count_mutex); 76static DEFINE_MUTEX(video_list_lock); 77static LIST_HEAD(video_bus_head); 78static int acpi_video_bus_add(struct acpi_device *device); 79static void acpi_video_bus_remove(struct acpi_device *device); 80static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data); 81 82/* 83 * Indices in the _BCL method response: the first two items are special, 84 * the rest are all supported levels. 85 * 86 * See page 575 of the ACPI spec 3.0 87 */ 88enum acpi_video_level_idx { 89 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 90 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 91 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 92}; 93 94static const struct acpi_device_id video_device_ids[] = { 95 {ACPI_VIDEO_HID, 0}, 96 {"", 0}, 97}; 98MODULE_DEVICE_TABLE(acpi, video_device_ids); 99 100static 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 }, 108}; 109 110struct acpi_video_bus_flags { 111 u8 multihead:1; /* can switch video heads */ 112 u8 rom:1; /* can retrieve a video rom */ 113 u8 post:1; /* can configure the head to */ 114 u8 reserved:5; 115}; 116 117struct acpi_video_bus_cap { 118 u8 _DOS:1; /* Enable/Disable output switching */ 119 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 120 u8 _ROM:1; /* Get ROM Data */ 121 u8 _GPD:1; /* Get POST Device */ 122 u8 _SPD:1; /* Set POST Device */ 123 u8 _VPO:1; /* Video POST Options */ 124 u8 reserved:2; 125}; 126 127struct acpi_video_device_attrib { 128 u32 display_index:4; /* A zero-based instance of the Display */ 129 u32 display_port_attachment:4; /* This field differentiates the display type */ 130 u32 display_type:4; /* Describe the specific type in use */ 131 u32 vendor_specific:4; /* Chipset Vendor Specific */ 132 u32 bios_can_detect:1; /* BIOS can detect the device */ 133 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 134 the VGA device. */ 135 u32 pipe_id:3; /* For VGA multiple-head devices. */ 136 u32 reserved:10; /* Must be 0 */ 137 138 /* 139 * The device ID might not actually follow the scheme described by this 140 * struct acpi_video_device_attrib. If it does, then this bit 141 * device_id_scheme is set; otherwise, other fields should be ignored. 142 * 143 * (but also see the global flag device_id_scheme) 144 */ 145 u32 device_id_scheme:1; 146}; 147 148struct acpi_video_enumerated_device { 149 union { 150 u32 int_val; 151 struct acpi_video_device_attrib attrib; 152 } value; 153 struct acpi_video_device *bind_info; 154}; 155 156struct acpi_video_bus { 157 struct acpi_device *device; 158 bool backlight_registered; 159 u8 dos_setting; 160 struct acpi_video_enumerated_device *attached_array; 161 u8 attached_count; 162 u8 child_count; 163 struct acpi_video_bus_cap cap; 164 struct acpi_video_bus_flags flags; 165 struct list_head video_device_list; 166 struct mutex device_list_lock; /* protects video_device_list */ 167 struct list_head entry; 168 struct input_dev *input; 169 char phys[32]; /* for input device */ 170 struct notifier_block pm_nb; 171}; 172 173struct acpi_video_device_flags { 174 u8 crt:1; 175 u8 lcd:1; 176 u8 tvout:1; 177 u8 dvi:1; 178 u8 bios:1; 179 u8 unknown:1; 180 u8 notify:1; 181 u8 reserved:1; 182}; 183 184struct acpi_video_device_cap { 185 u8 _ADR:1; /* Return the unique ID */ 186 u8 _BCL:1; /* Query list of brightness control levels supported */ 187 u8 _BCM:1; /* Set the brightness level */ 188 u8 _BQC:1; /* Get current brightness level */ 189 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 190 u8 _DDC:1; /* Return the EDID for this device */ 191}; 192 193struct acpi_video_device { 194 unsigned long device_id; 195 struct acpi_video_device_flags flags; 196 struct acpi_video_device_cap cap; 197 struct list_head entry; 198 struct delayed_work switch_brightness_work; 199 int switch_brightness_event; 200 struct acpi_video_bus *video; 201 struct acpi_device *dev; 202 struct acpi_video_device_brightness *brightness; 203 struct backlight_device *backlight; 204 struct thermal_cooling_device *cooling_dev; 205}; 206 207static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 208static void acpi_video_device_rebind(struct acpi_video_bus *video); 209static void acpi_video_device_bind(struct acpi_video_bus *video, 210 struct acpi_video_device *device); 211static int acpi_video_device_enumerate(struct acpi_video_bus *video); 212static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 213 int level); 214static int acpi_video_device_lcd_get_level_current( 215 struct acpi_video_device *device, 216 unsigned long long *level, bool raw); 217static int acpi_video_get_next_level(struct acpi_video_device *device, 218 u32 level_current, u32 event); 219static void acpi_video_switch_brightness(struct work_struct *work); 220 221/* backlight device sysfs support */ 222static int acpi_video_get_brightness(struct backlight_device *bd) 223{ 224 unsigned long long cur_level; 225 int i; 226 struct acpi_video_device *vd = bl_get_data(bd); 227 228 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 229 return -EINVAL; 230 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 231 if (vd->brightness->levels[i] == cur_level) 232 return i - ACPI_VIDEO_FIRST_LEVEL; 233 } 234 return 0; 235} 236 237static int acpi_video_set_brightness(struct backlight_device *bd) 238{ 239 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 240 struct acpi_video_device *vd = bl_get_data(bd); 241 242 cancel_delayed_work(&vd->switch_brightness_work); 243 return acpi_video_device_lcd_set_level(vd, 244 vd->brightness->levels[request_level]); 245} 246 247static const struct backlight_ops acpi_backlight_ops = { 248 .get_brightness = acpi_video_get_brightness, 249 .update_status = acpi_video_set_brightness, 250}; 251 252/* thermal cooling device callbacks */ 253static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 254 unsigned long *state) 255{ 256 struct acpi_video_device *video = cooling_dev->devdata; 257 258 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 259 return 0; 260} 261 262static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 263 unsigned long *state) 264{ 265 struct acpi_video_device *video = cooling_dev->devdata; 266 unsigned long long level; 267 int offset; 268 269 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 270 return -EINVAL; 271 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 272 offset++) 273 if (level == video->brightness->levels[offset]) { 274 *state = video->brightness->count - offset - 1; 275 return 0; 276 } 277 278 return -EINVAL; 279} 280 281static int 282video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 283{ 284 struct acpi_video_device *video = cooling_dev->devdata; 285 int level; 286 287 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 288 return -EINVAL; 289 290 state = video->brightness->count - state; 291 level = video->brightness->levels[state - 1]; 292 return acpi_video_device_lcd_set_level(video, level); 293} 294 295static const struct thermal_cooling_device_ops video_cooling_ops = { 296 .get_max_state = video_get_max_state, 297 .get_cur_state = video_get_cur_state, 298 .set_cur_state = video_set_cur_state, 299}; 300 301/* 302 * -------------------------------------------------------------------------- 303 * Video Management 304 * -------------------------------------------------------------------------- 305 */ 306 307static int 308acpi_video_device_lcd_query_levels(acpi_handle handle, 309 union acpi_object **levels) 310{ 311 int status; 312 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 313 union acpi_object *obj; 314 315 316 *levels = NULL; 317 318 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 319 if (ACPI_FAILURE(status)) 320 return status; 321 obj = (union acpi_object *)buffer.pointer; 322 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 323 acpi_handle_info(handle, "Invalid _BCL data\n"); 324 status = -EFAULT; 325 goto err; 326 } 327 328 *levels = obj; 329 330 return 0; 331 332err: 333 kfree(buffer.pointer); 334 335 return status; 336} 337 338static int 339acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 340{ 341 int status; 342 int state; 343 344 status = acpi_execute_simple_method(device->dev->handle, 345 "_BCM", level); 346 if (ACPI_FAILURE(status)) { 347 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n"); 348 return -EIO; 349 } 350 351 device->brightness->curr = level; 352 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 353 state++) 354 if (level == device->brightness->levels[state]) { 355 if (device->backlight) 356 device->backlight->props.brightness = 357 state - ACPI_VIDEO_FIRST_LEVEL; 358 return 0; 359 } 360 361 acpi_handle_info(device->dev->handle, "Current brightness invalid\n"); 362 return -EINVAL; 363} 364 365/* 366 * For some buggy _BQC methods, we need to add a constant value to 367 * the _BQC return value to get the actual current brightness level 368 */ 369 370static int bqc_offset_aml_bug_workaround; 371static int video_set_bqc_offset(const struct dmi_system_id *d) 372{ 373 bqc_offset_aml_bug_workaround = 9; 374 return 0; 375} 376 377static int video_set_device_id_scheme(const struct dmi_system_id *d) 378{ 379 device_id_scheme = true; 380 return 0; 381} 382 383static int video_enable_only_lcd(const struct dmi_system_id *d) 384{ 385 only_lcd = true; 386 return 0; 387} 388 389static int video_set_report_key_events(const struct dmi_system_id *id) 390{ 391 if (report_key_events == -1) 392 report_key_events = (uintptr_t)id->driver_data; 393 return 0; 394} 395 396static int video_hw_changes_brightness( 397 const struct dmi_system_id *d) 398{ 399 if (hw_changes_brightness == -1) 400 hw_changes_brightness = 1; 401 return 0; 402} 403 404static const struct dmi_system_id video_dmi_table[] = { 405 /* 406 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 407 */ 408 { 409 .callback = video_set_bqc_offset, 410 .ident = "Acer Aspire 5720", 411 .matches = { 412 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 413 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 414 }, 415 }, 416 { 417 .callback = video_set_bqc_offset, 418 .ident = "Acer Aspire 5710Z", 419 .matches = { 420 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 421 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 422 }, 423 }, 424 { 425 .callback = video_set_bqc_offset, 426 .ident = "eMachines E510", 427 .matches = { 428 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 429 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 430 }, 431 }, 432 { 433 .callback = video_set_bqc_offset, 434 .ident = "Acer Aspire 5315", 435 .matches = { 436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 438 }, 439 }, 440 { 441 .callback = video_set_bqc_offset, 442 .ident = "Acer Aspire 7720", 443 .matches = { 444 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 445 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 446 }, 447 }, 448 449 /* 450 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 451 * but the IDs actually follow the Device ID Scheme. 452 */ 453 { 454 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 455 .callback = video_set_device_id_scheme, 456 .ident = "ESPRIMO Mobile M9410", 457 .matches = { 458 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 459 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 460 }, 461 }, 462 /* 463 * Some machines have multiple video output devices, but only the one 464 * that is the type of LCD can do the backlight control so we should not 465 * register backlight interface for other video output devices. 466 */ 467 { 468 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 469 .callback = video_enable_only_lcd, 470 .ident = "ESPRIMO Mobile M9410", 471 .matches = { 472 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 473 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 474 }, 475 }, 476 /* 477 * Some machines report wrong key events on the acpi-bus, suppress 478 * key event reporting on these. Note this is only intended to work 479 * around events which are plain wrong. In some cases we get double 480 * events, in this case acpi-video is considered the canonical source 481 * and the events from the other source should be filtered. E.g. 482 * by calling acpi_video_handles_brightness_key_presses() from the 483 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 484 */ 485 { 486 .callback = video_set_report_key_events, 487 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 488 .ident = "Dell Vostro V131", 489 .matches = { 490 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 491 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 492 }, 493 }, 494 { 495 .callback = video_set_report_key_events, 496 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 497 .ident = "Dell Vostro 3350", 498 .matches = { 499 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 500 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), 501 }, 502 }, 503 { 504 .callback = video_set_report_key_events, 505 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 506 .ident = "COLORFUL X15 AT 23", 507 .matches = { 508 DMI_MATCH(DMI_SYS_VENDOR, "COLORFUL"), 509 DMI_MATCH(DMI_PRODUCT_NAME, "X15 AT 23"), 510 }, 511 }, 512 /* 513 * Some machines change the brightness themselves when a brightness 514 * hotkey gets pressed, despite us telling them not to. In this case 515 * acpi_video_device_notify() should only call backlight_force_update( 516 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 517 */ 518 { 519 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 520 .callback = video_hw_changes_brightness, 521 .ident = "Packard Bell EasyNote MZ35", 522 .matches = { 523 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 524 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 525 }, 526 }, 527 {} 528}; 529 530static unsigned long long 531acpi_video_bqc_value_to_level(struct acpi_video_device *device, 532 unsigned long long bqc_value) 533{ 534 unsigned long long level; 535 536 if (device->brightness->flags._BQC_use_index) { 537 /* 538 * _BQC returns an index that doesn't account for the first 2 539 * items with special meaning (see enum acpi_video_level_idx), 540 * so we need to compensate for that by offsetting ourselves 541 */ 542 if (device->brightness->flags._BCL_reversed) 543 bqc_value = device->brightness->count - 544 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 545 546 level = device->brightness->levels[bqc_value + 547 ACPI_VIDEO_FIRST_LEVEL]; 548 } else { 549 level = bqc_value; 550 } 551 552 level += bqc_offset_aml_bug_workaround; 553 554 return level; 555} 556 557static int 558acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 559 unsigned long long *level, bool raw) 560{ 561 acpi_status status = AE_OK; 562 int i; 563 564 if (device->cap._BQC || device->cap._BCQ) { 565 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 566 567 status = acpi_evaluate_integer(device->dev->handle, buf, 568 NULL, level); 569 if (ACPI_SUCCESS(status)) { 570 if (raw) { 571 /* 572 * Caller has indicated he wants the raw 573 * value returned by _BQC, so don't furtherly 574 * mess with the value. 575 */ 576 return 0; 577 } 578 579 *level = acpi_video_bqc_value_to_level(device, *level); 580 581 for (i = ACPI_VIDEO_FIRST_LEVEL; 582 i < device->brightness->count; i++) 583 if (device->brightness->levels[i] == *level) { 584 device->brightness->curr = *level; 585 return 0; 586 } 587 /* 588 * BQC returned an invalid level. 589 * Stop using it. 590 */ 591 acpi_handle_info(device->dev->handle, 592 "%s returned an invalid level", buf); 593 device->cap._BQC = device->cap._BCQ = 0; 594 } else { 595 /* 596 * Fixme: 597 * should we return an error or ignore this failure? 598 * dev->brightness->curr is a cached value which stores 599 * the correct current backlight level in most cases. 600 * ACPI video backlight still works w/ buggy _BQC. 601 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 602 */ 603 acpi_handle_info(device->dev->handle, 604 "%s evaluation failed", buf); 605 device->cap._BQC = device->cap._BCQ = 0; 606 } 607 } 608 609 *level = device->brightness->curr; 610 return 0; 611} 612 613static int 614acpi_video_device_EDID(struct acpi_video_device *device, 615 union acpi_object **edid, ssize_t length) 616{ 617 int status; 618 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 619 union acpi_object *obj; 620 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 621 struct acpi_object_list args = { 1, &arg0 }; 622 623 624 *edid = NULL; 625 626 if (!device) 627 return -ENODEV; 628 if (length == 128) 629 arg0.integer.value = 1; 630 else if (length == 256) 631 arg0.integer.value = 2; 632 else 633 return -EINVAL; 634 635 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 636 if (ACPI_FAILURE(status)) 637 return -ENODEV; 638 639 obj = buffer.pointer; 640 641 if (obj && obj->type == ACPI_TYPE_BUFFER) 642 *edid = obj; 643 else { 644 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); 645 status = -EFAULT; 646 kfree(obj); 647 } 648 649 return status; 650} 651 652/* bus */ 653 654/* 655 * Arg: 656 * video : video bus device pointer 657 * bios_flag : 658 * 0. The system BIOS should NOT automatically switch(toggle) 659 * the active display output. 660 * 1. The system BIOS should automatically switch (toggle) the 661 * active display output. No switch event. 662 * 2. The _DGS value should be locked. 663 * 3. The system BIOS should not automatically switch (toggle) the 664 * active display output, but instead generate the display switch 665 * event notify code. 666 * lcd_flag : 667 * 0. The system BIOS should automatically control the brightness level 668 * of the LCD when: 669 * - the power changes from AC to DC (ACPI appendix B) 670 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 671 * 1. The system BIOS should NOT automatically control the brightness 672 * level of the LCD when: 673 * - the power changes from AC to DC (ACPI appendix B) 674 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 675 * Return Value: 676 * -EINVAL wrong arg. 677 */ 678 679static int 680acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 681{ 682 acpi_status status; 683 684 if (!video->cap._DOS) 685 return 0; 686 687 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 688 return -EINVAL; 689 video->dos_setting = (lcd_flag << 2) | bios_flag; 690 status = acpi_execute_simple_method(video->device->handle, "_DOS", 691 (lcd_flag << 2) | bios_flag); 692 if (ACPI_FAILURE(status)) 693 return -EIO; 694 695 return 0; 696} 697 698/* 699 * Simple comparison function used to sort backlight levels. 700 */ 701 702static int 703acpi_video_cmp_level(const void *a, const void *b) 704{ 705 return *(int *)a - *(int *)b; 706} 707 708/* 709 * Decides if _BQC/_BCQ for this system is usable 710 * 711 * We do this by changing the level first and then read out the current 712 * brightness level, if the value does not match, find out if it is using 713 * index. If not, clear the _BQC/_BCQ capability. 714 */ 715static int acpi_video_bqc_quirk(struct acpi_video_device *device, 716 int max_level, int current_level) 717{ 718 struct acpi_video_device_brightness *br = device->brightness; 719 int result; 720 unsigned long long level; 721 int test_level; 722 723 /* don't mess with existing known broken systems */ 724 if (bqc_offset_aml_bug_workaround) 725 return 0; 726 727 /* 728 * Some systems always report current brightness level as maximum 729 * through _BQC, we need to test another value for them. However, 730 * there is a subtlety: 731 * 732 * If the _BCL package ordering is descending, the first level 733 * (br->levels[2]) is likely to be 0, and if the number of levels 734 * matches the number of steps, we might confuse a returned level to 735 * mean the index. 736 * 737 * For example: 738 * 739 * current_level = max_level = 100 740 * test_level = 0 741 * returned level = 100 742 * 743 * In this case 100 means the level, not the index, and _BCM failed. 744 * Still, if the _BCL package ordering is descending, the index of 745 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 746 * 747 * This causes all _BQC calls to return bogus values causing weird 748 * behavior from the user's perspective. For example: 749 * 750 * xbacklight -set 10; xbacklight -set 20; 751 * 752 * would flash to 90% and then slowly down to the desired level (20). 753 * 754 * The solution is simple; test anything other than the first level 755 * (e.g. 1). 756 */ 757 test_level = current_level == max_level 758 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 759 : max_level; 760 761 result = acpi_video_device_lcd_set_level(device, test_level); 762 if (result) 763 return result; 764 765 result = acpi_video_device_lcd_get_level_current(device, &level, true); 766 if (result) 767 return result; 768 769 if (level != test_level) { 770 /* buggy _BQC found, need to find out if it uses index */ 771 if (level < br->count) { 772 if (br->flags._BCL_reversed) 773 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 774 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 775 br->flags._BQC_use_index = 1; 776 } 777 778 if (!br->flags._BQC_use_index) 779 device->cap._BQC = device->cap._BCQ = 0; 780 } 781 782 return 0; 783} 784 785int acpi_video_get_levels(struct acpi_device *device, 786 struct acpi_video_device_brightness **dev_br, 787 int *pmax_level) 788{ 789 union acpi_object *obj = NULL; 790 int i, max_level = 0, count = 0, level_ac_battery = 0; 791 union acpi_object *o; 792 struct acpi_video_device_brightness *br = NULL; 793 int result = 0; 794 u32 value; 795 796 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 797 acpi_handle_debug(device->handle, 798 "Could not query available LCD brightness level\n"); 799 result = -ENODEV; 800 goto out; 801 } 802 803 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 804 result = -EINVAL; 805 goto out; 806 } 807 808 br = kzalloc(sizeof(*br), GFP_KERNEL); 809 if (!br) { 810 result = -ENOMEM; 811 goto out; 812 } 813 814 /* 815 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 816 * in order to account for buggy BIOS which don't export the first two 817 * special levels (see below) 818 */ 819 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 820 sizeof(*br->levels), 821 GFP_KERNEL); 822 if (!br->levels) { 823 result = -ENOMEM; 824 goto out_free; 825 } 826 827 for (i = 0; i < obj->package.count; i++) { 828 o = (union acpi_object *)&obj->package.elements[i]; 829 if (o->type != ACPI_TYPE_INTEGER) { 830 acpi_handle_info(device->handle, "Invalid data\n"); 831 continue; 832 } 833 value = (u32) o->integer.value; 834 /* Skip duplicate entries */ 835 if (count > ACPI_VIDEO_FIRST_LEVEL 836 && br->levels[count - 1] == value) 837 continue; 838 839 br->levels[count] = value; 840 841 if (br->levels[count] > max_level) 842 max_level = br->levels[count]; 843 count++; 844 } 845 846 /* 847 * some buggy BIOS don't export the levels 848 * when machine is on AC/Battery in _BCL package. 849 * In this case, the first two elements in _BCL packages 850 * are also supported brightness levels that OS should take care of. 851 */ 852 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 853 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 854 level_ac_battery++; 855 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 856 level_ac_battery++; 857 } 858 859 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 860 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 861 br->flags._BCL_no_ac_battery_levels = 1; 862 for (i = (count - 1 + level_ac_battery); 863 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 864 br->levels[i] = br->levels[i - level_ac_battery]; 865 count += level_ac_battery; 866 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 867 acpi_handle_info(device->handle, 868 "Too many duplicates in _BCL package"); 869 870 /* Check if the _BCL package is in a reversed order */ 871 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 872 br->flags._BCL_reversed = 1; 873 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 874 count - ACPI_VIDEO_FIRST_LEVEL, 875 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 876 acpi_video_cmp_level, NULL); 877 } else if (max_level != br->levels[count - 1]) 878 acpi_handle_info(device->handle, 879 "Found unordered _BCL package"); 880 881 br->count = count; 882 *dev_br = br; 883 if (pmax_level) 884 *pmax_level = max_level; 885 886out: 887 kfree(obj); 888 return result; 889out_free: 890 kfree(br); 891 goto out; 892} 893EXPORT_SYMBOL(acpi_video_get_levels); 894 895/* 896 * Arg: 897 * device : video output device (LCD, CRT, ..) 898 * 899 * Return Value: 900 * Maximum brightness level 901 * 902 * Allocate and initialize device->brightness. 903 */ 904 905static int 906acpi_video_init_brightness(struct acpi_video_device *device) 907{ 908 int i, max_level = 0; 909 unsigned long long level, level_old; 910 struct acpi_video_device_brightness *br = NULL; 911 int result; 912 913 result = acpi_video_get_levels(device->dev, &br, &max_level); 914 if (result) 915 return result; 916 device->brightness = br; 917 918 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 919 br->curr = level = max_level; 920 921 if (!device->cap._BQC) 922 goto set_level; 923 924 result = acpi_video_device_lcd_get_level_current(device, 925 &level_old, true); 926 if (result) 927 goto out_free_levels; 928 929 result = acpi_video_bqc_quirk(device, max_level, level_old); 930 if (result) 931 goto out_free_levels; 932 /* 933 * cap._BQC may get cleared due to _BQC is found to be broken 934 * in acpi_video_bqc_quirk, so check again here. 935 */ 936 if (!device->cap._BQC) 937 goto set_level; 938 939 level = acpi_video_bqc_value_to_level(device, level_old); 940 /* 941 * On some buggy laptops, _BQC returns an uninitialized 942 * value when invoked for the first time, i.e. 943 * level_old is invalid (no matter whether it's a level 944 * or an index). Set the backlight to max_level in this case. 945 */ 946 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 947 if (level == br->levels[i]) 948 break; 949 if (i == br->count || !level) 950 level = max_level; 951 952set_level: 953 result = acpi_video_device_lcd_set_level(device, level); 954 if (result) 955 goto out_free_levels; 956 957 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 958 br->count - ACPI_VIDEO_FIRST_LEVEL); 959 960 return 0; 961 962out_free_levels: 963 kfree(br->levels); 964 kfree(br); 965 device->brightness = NULL; 966 return result; 967} 968 969/* 970 * Arg: 971 * device : video output device (LCD, CRT, ..) 972 * 973 * Return Value: 974 * None 975 * 976 * Find out all required AML methods defined under the output 977 * device. 978 */ 979 980static void acpi_video_device_find_cap(struct acpi_video_device *device) 981{ 982 if (acpi_has_method(device->dev->handle, "_ADR")) 983 device->cap._ADR = 1; 984 if (acpi_has_method(device->dev->handle, "_BCL")) 985 device->cap._BCL = 1; 986 if (acpi_has_method(device->dev->handle, "_BCM")) 987 device->cap._BCM = 1; 988 if (acpi_has_method(device->dev->handle, "_BQC")) { 989 device->cap._BQC = 1; 990 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 991 acpi_handle_info(device->dev->handle, 992 "_BCQ is used instead of _BQC\n"); 993 device->cap._BCQ = 1; 994 } 995 996 if (acpi_has_method(device->dev->handle, "_DDC")) 997 device->cap._DDC = 1; 998} 999 1000/* 1001 * Arg: 1002 * device : video output device (VGA) 1003 * 1004 * Return Value: 1005 * None 1006 * 1007 * Find out all required AML methods defined under the video bus device. 1008 */ 1009 1010static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1011{ 1012 if (acpi_has_method(video->device->handle, "_DOS")) 1013 video->cap._DOS = 1; 1014 if (acpi_has_method(video->device->handle, "_DOD")) 1015 video->cap._DOD = 1; 1016 if (acpi_has_method(video->device->handle, "_ROM")) 1017 video->cap._ROM = 1; 1018 if (acpi_has_method(video->device->handle, "_GPD")) 1019 video->cap._GPD = 1; 1020 if (acpi_has_method(video->device->handle, "_SPD")) 1021 video->cap._SPD = 1; 1022 if (acpi_has_method(video->device->handle, "_VPO")) 1023 video->cap._VPO = 1; 1024} 1025 1026/* 1027 * Check whether the video bus device has required AML method to 1028 * support the desired features 1029 */ 1030 1031static int acpi_video_bus_check(struct acpi_video_bus *video) 1032{ 1033 acpi_status status = -ENOENT; 1034 struct pci_dev *dev; 1035 1036 if (!video) 1037 return -EINVAL; 1038 1039 dev = acpi_get_pci_dev(video->device->handle); 1040 if (!dev) 1041 return -ENODEV; 1042 pci_dev_put(dev); 1043 1044 /* 1045 * Since there is no HID, CID and so on for VGA driver, we have 1046 * to check well known required nodes. 1047 */ 1048 1049 /* Does this device support video switching? */ 1050 if (video->cap._DOS || video->cap._DOD) { 1051 if (!video->cap._DOS) { 1052 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1053 acpi_device_bid(video->device)); 1054 } 1055 video->flags.multihead = 1; 1056 status = 0; 1057 } 1058 1059 /* Does this device support retrieving a video ROM? */ 1060 if (video->cap._ROM) { 1061 video->flags.rom = 1; 1062 status = 0; 1063 } 1064 1065 /* Does this device support configuring which video device to POST? */ 1066 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1067 video->flags.post = 1; 1068 status = 0; 1069 } 1070 1071 return status; 1072} 1073 1074/* 1075 * -------------------------------------------------------------------------- 1076 * Driver Interface 1077 * -------------------------------------------------------------------------- 1078 */ 1079 1080/* device interface */ 1081static struct acpi_video_device_attrib * 1082acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1083{ 1084 struct acpi_video_enumerated_device *ids; 1085 int i; 1086 1087 for (i = 0; i < video->attached_count; i++) { 1088 ids = &video->attached_array[i]; 1089 if ((ids->value.int_val & 0xffff) == device_id) 1090 return &ids->value.attrib; 1091 } 1092 1093 return NULL; 1094} 1095 1096static int 1097acpi_video_get_device_type(struct acpi_video_bus *video, 1098 unsigned long device_id) 1099{ 1100 struct acpi_video_enumerated_device *ids; 1101 int i; 1102 1103 for (i = 0; i < video->attached_count; i++) { 1104 ids = &video->attached_array[i]; 1105 if ((ids->value.int_val & 0xffff) == device_id) 1106 return ids->value.int_val; 1107 } 1108 1109 return 0; 1110} 1111 1112static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1113{ 1114 struct acpi_video_bus *video = arg; 1115 struct acpi_video_device_attrib *attribute; 1116 struct acpi_video_device *data; 1117 unsigned long long device_id; 1118 acpi_status status; 1119 int device_type; 1120 1121 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1122 /* Skip devices without _ADR instead of failing. */ 1123 if (ACPI_FAILURE(status)) 1124 goto exit; 1125 1126 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1127 if (!data) { 1128 dev_dbg(&device->dev, "Cannot attach\n"); 1129 return -ENOMEM; 1130 } 1131 1132 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1133 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1134 1135 data->device_id = device_id; 1136 data->video = video; 1137 data->dev = device; 1138 INIT_DELAYED_WORK(&data->switch_brightness_work, 1139 acpi_video_switch_brightness); 1140 1141 attribute = acpi_video_get_device_attr(video, device_id); 1142 1143 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1144 switch (attribute->display_type) { 1145 case ACPI_VIDEO_DISPLAY_CRT: 1146 data->flags.crt = 1; 1147 break; 1148 case ACPI_VIDEO_DISPLAY_TV: 1149 data->flags.tvout = 1; 1150 break; 1151 case ACPI_VIDEO_DISPLAY_DVI: 1152 data->flags.dvi = 1; 1153 break; 1154 case ACPI_VIDEO_DISPLAY_LCD: 1155 data->flags.lcd = 1; 1156 break; 1157 default: 1158 data->flags.unknown = 1; 1159 break; 1160 } 1161 if (attribute->bios_can_detect) 1162 data->flags.bios = 1; 1163 } else { 1164 /* Check for legacy IDs */ 1165 device_type = acpi_video_get_device_type(video, device_id); 1166 /* Ignore bits 16 and 18-20 */ 1167 switch (device_type & 0xffe2ffff) { 1168 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1169 data->flags.crt = 1; 1170 break; 1171 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1172 data->flags.lcd = 1; 1173 break; 1174 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1175 data->flags.tvout = 1; 1176 break; 1177 default: 1178 data->flags.unknown = 1; 1179 } 1180 } 1181 1182 acpi_video_device_bind(video, data); 1183 acpi_video_device_find_cap(data); 1184 1185 if (data->cap._BCM && data->cap._BCL) 1186 may_report_brightness_keys = true; 1187 1188 mutex_lock(&video->device_list_lock); 1189 list_add_tail(&data->entry, &video->video_device_list); 1190 mutex_unlock(&video->device_list_lock); 1191 1192exit: 1193 video->child_count++; 1194 return 0; 1195} 1196 1197/* 1198 * Arg: 1199 * video : video bus device 1200 * 1201 * Return: 1202 * none 1203 * 1204 * Enumerate the video device list of the video bus, 1205 * bind the ids with the corresponding video devices 1206 * under the video bus. 1207 */ 1208 1209static void acpi_video_device_rebind(struct acpi_video_bus *video) 1210{ 1211 struct acpi_video_device *dev; 1212 1213 mutex_lock(&video->device_list_lock); 1214 1215 list_for_each_entry(dev, &video->video_device_list, entry) 1216 acpi_video_device_bind(video, dev); 1217 1218 mutex_unlock(&video->device_list_lock); 1219} 1220 1221/* 1222 * Arg: 1223 * video : video bus device 1224 * device : video output device under the video 1225 * bus 1226 * 1227 * Return: 1228 * none 1229 * 1230 * Bind the ids with the corresponding video devices 1231 * under the video bus. 1232 */ 1233 1234static void 1235acpi_video_device_bind(struct acpi_video_bus *video, 1236 struct acpi_video_device *device) 1237{ 1238 struct acpi_video_enumerated_device *ids; 1239 int i; 1240 1241 for (i = 0; i < video->attached_count; i++) { 1242 ids = &video->attached_array[i]; 1243 if (device->device_id == (ids->value.int_val & 0xffff)) { 1244 ids->bind_info = device; 1245 acpi_handle_debug(video->device->handle, "%s: %d\n", 1246 __func__, i); 1247 } 1248 } 1249} 1250 1251static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1252{ 1253 struct acpi_video_bus *video = device->video; 1254 int i; 1255 1256 /* 1257 * If we have a broken _DOD or we have more than 8 output devices 1258 * under the graphics controller node that we can't proper deal with 1259 * in the operation region code currently, no need to test. 1260 */ 1261 if (!video->attached_count || video->child_count > 8) 1262 return true; 1263 1264 for (i = 0; i < video->attached_count; i++) { 1265 if ((video->attached_array[i].value.int_val & 0xfff) == 1266 (device->device_id & 0xfff)) 1267 return true; 1268 } 1269 1270 return false; 1271} 1272 1273/* 1274 * Arg: 1275 * video : video bus device 1276 * 1277 * Return: 1278 * < 0 : error 1279 * 1280 * Call _DOD to enumerate all devices attached to display adapter 1281 * 1282 */ 1283 1284static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1285{ 1286 int status; 1287 int count; 1288 int i; 1289 struct acpi_video_enumerated_device *active_list; 1290 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1291 union acpi_object *dod = NULL; 1292 union acpi_object *obj; 1293 1294 if (!video->cap._DOD) 1295 return AE_NOT_EXIST; 1296 1297 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1298 if (ACPI_FAILURE(status)) { 1299 acpi_handle_info(video->device->handle, 1300 "_DOD evaluation failed: %s\n", 1301 acpi_format_exception(status)); 1302 return status; 1303 } 1304 1305 dod = buffer.pointer; 1306 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1307 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1308 status = -EFAULT; 1309 goto out; 1310 } 1311 1312 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1313 dod->package.count); 1314 1315 active_list = kcalloc(1 + dod->package.count, 1316 sizeof(struct acpi_video_enumerated_device), 1317 GFP_KERNEL); 1318 if (!active_list) { 1319 status = -ENOMEM; 1320 goto out; 1321 } 1322 1323 count = 0; 1324 for (i = 0; i < dod->package.count; i++) { 1325 obj = &dod->package.elements[i]; 1326 1327 if (obj->type != ACPI_TYPE_INTEGER) { 1328 acpi_handle_info(video->device->handle, 1329 "Invalid _DOD data in element %d\n", i); 1330 continue; 1331 } 1332 1333 active_list[count].value.int_val = obj->integer.value; 1334 active_list[count].bind_info = NULL; 1335 1336 acpi_handle_debug(video->device->handle, 1337 "_DOD element[%d] = %d\n", i, 1338 (int)obj->integer.value); 1339 1340 count++; 1341 } 1342 1343 kfree(video->attached_array); 1344 1345 video->attached_array = active_list; 1346 video->attached_count = count; 1347 1348out: 1349 kfree(buffer.pointer); 1350 return status; 1351} 1352 1353static int 1354acpi_video_get_next_level(struct acpi_video_device *device, 1355 u32 level_current, u32 event) 1356{ 1357 int min, max, min_above, max_below, i, l, delta = 255; 1358 max = max_below = 0; 1359 min = min_above = 255; 1360 /* Find closest level to level_current */ 1361 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1362 l = device->brightness->levels[i]; 1363 if (abs(l - level_current) < abs(delta)) { 1364 delta = l - level_current; 1365 if (!delta) 1366 break; 1367 } 1368 } 1369 /* Adjust level_current to closest available level */ 1370 level_current += delta; 1371 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1372 l = device->brightness->levels[i]; 1373 if (l < min) 1374 min = l; 1375 if (l > max) 1376 max = l; 1377 if (l < min_above && l > level_current) 1378 min_above = l; 1379 if (l > max_below && l < level_current) 1380 max_below = l; 1381 } 1382 1383 switch (event) { 1384 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1385 return (level_current < max) ? min_above : min; 1386 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1387 return (level_current < max) ? min_above : max; 1388 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1389 return (level_current > min) ? max_below : min; 1390 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1391 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1392 return 0; 1393 default: 1394 return level_current; 1395 } 1396} 1397 1398static void 1399acpi_video_switch_brightness(struct work_struct *work) 1400{ 1401 struct acpi_video_device *device = container_of(to_delayed_work(work), 1402 struct acpi_video_device, switch_brightness_work); 1403 unsigned long long level_current, level_next; 1404 int event = device->switch_brightness_event; 1405 int result = -EINVAL; 1406 1407 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1408 if (!device->backlight) 1409 return; 1410 1411 if (!device->brightness) 1412 goto out; 1413 1414 result = acpi_video_device_lcd_get_level_current(device, 1415 &level_current, 1416 false); 1417 if (result) 1418 goto out; 1419 1420 level_next = acpi_video_get_next_level(device, level_current, event); 1421 1422 result = acpi_video_device_lcd_set_level(device, level_next); 1423 1424 if (!result) 1425 backlight_force_update(device->backlight, 1426 BACKLIGHT_UPDATE_HOTKEY); 1427 1428out: 1429 if (result) 1430 acpi_handle_info(device->dev->handle, 1431 "Failed to switch brightness\n"); 1432} 1433 1434int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1435 void **edid) 1436{ 1437 struct acpi_video_bus *video; 1438 struct acpi_video_device *video_device; 1439 union acpi_object *buffer = NULL; 1440 acpi_status status; 1441 int i, length; 1442 1443 if (!device || !acpi_driver_data(device)) 1444 return -EINVAL; 1445 1446 video = acpi_driver_data(device); 1447 1448 for (i = 0; i < video->attached_count; i++) { 1449 video_device = video->attached_array[i].bind_info; 1450 length = 256; 1451 1452 if (!video_device) 1453 continue; 1454 1455 if (!video_device->cap._DDC) 1456 continue; 1457 1458 if (type) { 1459 switch (type) { 1460 case ACPI_VIDEO_DISPLAY_CRT: 1461 if (!video_device->flags.crt) 1462 continue; 1463 break; 1464 case ACPI_VIDEO_DISPLAY_TV: 1465 if (!video_device->flags.tvout) 1466 continue; 1467 break; 1468 case ACPI_VIDEO_DISPLAY_DVI: 1469 if (!video_device->flags.dvi) 1470 continue; 1471 break; 1472 case ACPI_VIDEO_DISPLAY_LCD: 1473 if (!video_device->flags.lcd) 1474 continue; 1475 break; 1476 } 1477 } else if (video_device->device_id != device_id) { 1478 continue; 1479 } 1480 1481 status = acpi_video_device_EDID(video_device, &buffer, length); 1482 1483 if (ACPI_FAILURE(status) || !buffer || 1484 buffer->type != ACPI_TYPE_BUFFER) { 1485 length = 128; 1486 status = acpi_video_device_EDID(video_device, &buffer, 1487 length); 1488 if (ACPI_FAILURE(status) || !buffer || 1489 buffer->type != ACPI_TYPE_BUFFER) { 1490 continue; 1491 } 1492 } 1493 1494 *edid = buffer->buffer.pointer; 1495 return length; 1496 } 1497 1498 return -ENODEV; 1499} 1500EXPORT_SYMBOL(acpi_video_get_edid); 1501 1502static int 1503acpi_video_bus_get_devices(struct acpi_video_bus *video, 1504 struct acpi_device *device) 1505{ 1506 /* 1507 * There are systems where video module known to work fine regardless 1508 * of broken _DOD and ignoring returned value here doesn't cause 1509 * any issues later. 1510 */ 1511 acpi_video_device_enumerate(video); 1512 1513 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1514} 1515 1516/* acpi_video interface */ 1517 1518/* 1519 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1520 * perform any automatic brightness change on receiving a notification. 1521 */ 1522static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1523{ 1524 return acpi_video_bus_DOS(video, 0, 1525 acpi_osi_is_win8() ? 1 : 0); 1526} 1527 1528static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1529{ 1530 return acpi_video_bus_DOS(video, 0, 1531 acpi_osi_is_win8() ? 0 : 1); 1532} 1533 1534static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data) 1535{ 1536 struct acpi_device *device = data; 1537 struct acpi_video_bus *video = acpi_driver_data(device); 1538 struct input_dev *input; 1539 int keycode = 0; 1540 1541 if (!video || !video->input) 1542 return; 1543 1544 input = video->input; 1545 1546 switch (event) { 1547 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1548 * most likely via hotkey. */ 1549 keycode = KEY_SWITCHVIDEOMODE; 1550 break; 1551 1552 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1553 * connector. */ 1554 acpi_video_device_enumerate(video); 1555 acpi_video_device_rebind(video); 1556 keycode = KEY_SWITCHVIDEOMODE; 1557 break; 1558 1559 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1560 keycode = KEY_SWITCHVIDEOMODE; 1561 break; 1562 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1563 keycode = KEY_VIDEO_NEXT; 1564 break; 1565 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1566 keycode = KEY_VIDEO_PREV; 1567 break; 1568 1569 default: 1570 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1571 event); 1572 break; 1573 } 1574 1575 if (acpi_notifier_call_chain(device, event, 0)) 1576 /* Something vetoed the keypress. */ 1577 keycode = 0; 1578 1579 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1580 input_report_key(input, keycode, 1); 1581 input_sync(input); 1582 input_report_key(input, keycode, 0); 1583 input_sync(input); 1584 } 1585} 1586 1587static void brightness_switch_event(struct acpi_video_device *video_device, 1588 u32 event) 1589{ 1590 if (!brightness_switch_enabled) 1591 return; 1592 1593 video_device->switch_brightness_event = event; 1594 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1595} 1596 1597static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1598{ 1599 struct acpi_video_device *video_device = data; 1600 struct acpi_device *device = NULL; 1601 struct acpi_video_bus *bus; 1602 struct input_dev *input; 1603 int keycode = 0; 1604 1605 if (!video_device) 1606 return; 1607 1608 device = video_device->dev; 1609 bus = video_device->video; 1610 input = bus->input; 1611 1612 if (hw_changes_brightness > 0) { 1613 if (video_device->backlight) 1614 backlight_force_update(video_device->backlight, 1615 BACKLIGHT_UPDATE_HOTKEY); 1616 acpi_notifier_call_chain(device, event, 0); 1617 return; 1618 } 1619 1620 switch (event) { 1621 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1622 brightness_switch_event(video_device, event); 1623 keycode = KEY_BRIGHTNESS_CYCLE; 1624 break; 1625 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1626 brightness_switch_event(video_device, event); 1627 keycode = KEY_BRIGHTNESSUP; 1628 break; 1629 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1630 brightness_switch_event(video_device, event); 1631 keycode = KEY_BRIGHTNESSDOWN; 1632 break; 1633 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1634 brightness_switch_event(video_device, event); 1635 keycode = KEY_BRIGHTNESS_ZERO; 1636 break; 1637 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1638 brightness_switch_event(video_device, event); 1639 keycode = KEY_DISPLAY_OFF; 1640 break; 1641 default: 1642 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1643 break; 1644 } 1645 1646 if (keycode) 1647 may_report_brightness_keys = true; 1648 1649 acpi_notifier_call_chain(device, event, 0); 1650 1651 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1652 input_report_key(input, keycode, 1); 1653 input_sync(input); 1654 input_report_key(input, keycode, 0); 1655 input_sync(input); 1656 } 1657} 1658 1659static int acpi_video_resume(struct notifier_block *nb, 1660 unsigned long val, void *ign) 1661{ 1662 struct acpi_video_bus *video; 1663 struct acpi_video_device *video_device; 1664 int i; 1665 1666 switch (val) { 1667 case PM_POST_HIBERNATION: 1668 case PM_POST_SUSPEND: 1669 case PM_POST_RESTORE: 1670 video = container_of(nb, struct acpi_video_bus, pm_nb); 1671 1672 dev_info(&video->device->dev, "Restoring backlight state\n"); 1673 1674 for (i = 0; i < video->attached_count; i++) { 1675 video_device = video->attached_array[i].bind_info; 1676 if (video_device && video_device->brightness) 1677 acpi_video_device_lcd_set_level(video_device, 1678 video_device->brightness->curr); 1679 } 1680 1681 return NOTIFY_OK; 1682 } 1683 return NOTIFY_DONE; 1684} 1685 1686static acpi_status 1687acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1688 void **return_value) 1689{ 1690 struct acpi_device *device = context; 1691 struct acpi_device *sibling; 1692 1693 if (handle == device->handle) 1694 return AE_CTRL_TERMINATE; 1695 1696 sibling = acpi_fetch_acpi_dev(handle); 1697 if (!sibling) 1698 return AE_OK; 1699 1700 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1701 return AE_ALREADY_EXISTS; 1702 1703 return AE_OK; 1704} 1705 1706static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1707{ 1708 struct backlight_properties props; 1709 struct pci_dev *pdev; 1710 acpi_handle acpi_parent; 1711 struct device *parent = NULL; 1712 int result; 1713 static int count; 1714 char *name; 1715 1716 result = acpi_video_init_brightness(device); 1717 if (result) 1718 return; 1719 1720 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1721 if (!name) 1722 return; 1723 count++; 1724 1725 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) { 1726 pdev = acpi_get_pci_dev(acpi_parent); 1727 if (pdev) { 1728 parent = &pdev->dev; 1729 pci_dev_put(pdev); 1730 } 1731 } 1732 1733 memset(&props, 0, sizeof(struct backlight_properties)); 1734 props.type = BACKLIGHT_FIRMWARE; 1735 props.max_brightness = 1736 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1737 device->backlight = backlight_device_register(name, 1738 parent, 1739 device, 1740 &acpi_backlight_ops, 1741 &props); 1742 kfree(name); 1743 if (IS_ERR(device->backlight)) { 1744 device->backlight = NULL; 1745 return; 1746 } 1747 1748 /* 1749 * Save current brightness level in case we have to restore it 1750 * before acpi_video_device_lcd_set_level() is called next time. 1751 */ 1752 device->backlight->props.brightness = 1753 acpi_video_get_brightness(device->backlight); 1754 1755 device->cooling_dev = thermal_cooling_device_register("LCD", device, 1756 &video_cooling_ops); 1757 if (IS_ERR(device->cooling_dev)) { 1758 /* 1759 * Set cooling_dev to NULL so we don't crash trying to free it. 1760 * Also, why the hell we are returning early and not attempt to 1761 * register video output if cooling device registration failed? 1762 * -- dtor 1763 */ 1764 device->cooling_dev = NULL; 1765 return; 1766 } 1767 1768 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1769 device->cooling_dev->id); 1770 result = sysfs_create_link(&device->dev->dev.kobj, 1771 &device->cooling_dev->device.kobj, 1772 "thermal_cooling"); 1773 if (result) 1774 pr_info("sysfs link creation failed\n"); 1775 1776 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1777 &device->dev->dev.kobj, "device"); 1778 if (result) 1779 pr_info("Reverse sysfs link creation failed\n"); 1780} 1781 1782static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1783{ 1784 struct acpi_video_device *dev; 1785 union acpi_object *levels; 1786 1787 mutex_lock(&video->device_list_lock); 1788 list_for_each_entry(dev, &video->video_device_list, entry) { 1789 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1790 kfree(levels); 1791 } 1792 mutex_unlock(&video->device_list_lock); 1793} 1794 1795static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1796{ 1797 /* 1798 * Do not create backlight device for video output 1799 * device that is not in the enumerated list. 1800 */ 1801 if (!acpi_video_device_in_dod(dev)) { 1802 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1803 return false; 1804 } 1805 1806 if (only_lcd) 1807 return dev->flags.lcd; 1808 return true; 1809} 1810 1811static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1812{ 1813 struct acpi_video_device *dev; 1814 1815 if (video->backlight_registered) 1816 return 0; 1817 1818 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1819 return 0; 1820 1821 mutex_lock(&video->device_list_lock); 1822 list_for_each_entry(dev, &video->video_device_list, entry) { 1823 if (acpi_video_should_register_backlight(dev)) 1824 acpi_video_dev_register_backlight(dev); 1825 } 1826 mutex_unlock(&video->device_list_lock); 1827 1828 video->backlight_registered = true; 1829 1830 video->pm_nb.notifier_call = acpi_video_resume; 1831 video->pm_nb.priority = 0; 1832 return register_pm_notifier(&video->pm_nb); 1833} 1834 1835static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1836{ 1837 if (device->backlight) { 1838 backlight_device_unregister(device->backlight); 1839 device->backlight = NULL; 1840 } 1841 if (device->brightness) { 1842 kfree(device->brightness->levels); 1843 kfree(device->brightness); 1844 device->brightness = NULL; 1845 } 1846 if (device->cooling_dev) { 1847 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1848 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1849 thermal_cooling_device_unregister(device->cooling_dev); 1850 device->cooling_dev = NULL; 1851 } 1852} 1853 1854static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1855{ 1856 struct acpi_video_device *dev; 1857 int error; 1858 1859 if (!video->backlight_registered) 1860 return 0; 1861 1862 error = unregister_pm_notifier(&video->pm_nb); 1863 1864 mutex_lock(&video->device_list_lock); 1865 list_for_each_entry(dev, &video->video_device_list, entry) 1866 acpi_video_dev_unregister_backlight(dev); 1867 mutex_unlock(&video->device_list_lock); 1868 1869 video->backlight_registered = false; 1870 1871 return error; 1872} 1873 1874static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1875{ 1876 acpi_status status; 1877 struct acpi_device *adev = device->dev; 1878 1879 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1880 acpi_video_device_notify, device); 1881 if (ACPI_FAILURE(status)) 1882 dev_err(&adev->dev, "Error installing notify handler\n"); 1883 else 1884 device->flags.notify = 1; 1885} 1886 1887static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1888{ 1889 struct input_dev *input; 1890 struct acpi_video_device *dev; 1891 int error; 1892 1893 video->input = input = input_allocate_device(); 1894 if (!input) { 1895 error = -ENOMEM; 1896 goto out; 1897 } 1898 1899 error = acpi_video_bus_start_devices(video); 1900 if (error) 1901 goto err_free_input; 1902 1903 snprintf(video->phys, sizeof(video->phys), 1904 "%s/video/input0", acpi_device_hid(video->device)); 1905 1906 input->name = acpi_device_name(video->device); 1907 input->phys = video->phys; 1908 input->id.bustype = BUS_HOST; 1909 input->id.product = 0x06; 1910 input->dev.parent = &video->device->dev; 1911 input->evbit[0] = BIT(EV_KEY); 1912 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1913 set_bit(KEY_VIDEO_NEXT, input->keybit); 1914 set_bit(KEY_VIDEO_PREV, input->keybit); 1915 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1916 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1917 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1918 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1919 set_bit(KEY_DISPLAY_OFF, input->keybit); 1920 1921 error = input_register_device(input); 1922 if (error) 1923 goto err_stop_dev; 1924 1925 mutex_lock(&video->device_list_lock); 1926 list_for_each_entry(dev, &video->video_device_list, entry) 1927 acpi_video_dev_add_notify_handler(dev); 1928 mutex_unlock(&video->device_list_lock); 1929 1930 return 0; 1931 1932err_stop_dev: 1933 acpi_video_bus_stop_devices(video); 1934err_free_input: 1935 input_free_device(input); 1936 video->input = NULL; 1937out: 1938 return error; 1939} 1940 1941static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1942{ 1943 if (dev->flags.notify) { 1944 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1945 acpi_video_device_notify); 1946 dev->flags.notify = 0; 1947 } 1948} 1949 1950static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1951{ 1952 struct acpi_video_device *dev; 1953 1954 mutex_lock(&video->device_list_lock); 1955 list_for_each_entry(dev, &video->video_device_list, entry) 1956 acpi_video_dev_remove_notify_handler(dev); 1957 mutex_unlock(&video->device_list_lock); 1958 1959 acpi_video_bus_stop_devices(video); 1960 input_unregister_device(video->input); 1961 video->input = NULL; 1962} 1963 1964static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1965{ 1966 struct acpi_video_device *dev, *next; 1967 1968 mutex_lock(&video->device_list_lock); 1969 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1970 list_del(&dev->entry); 1971 kfree(dev); 1972 } 1973 mutex_unlock(&video->device_list_lock); 1974 1975 return 0; 1976} 1977 1978static int instance; 1979 1980static int acpi_video_bus_add(struct acpi_device *device) 1981{ 1982 struct acpi_video_bus *video; 1983 bool auto_detect; 1984 int error; 1985 acpi_status status; 1986 1987 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1988 acpi_dev_parent(device)->handle, 1, 1989 acpi_video_bus_match, NULL, 1990 device, NULL); 1991 if (status == AE_ALREADY_EXISTS) { 1992 pr_info(FW_BUG 1993 "Duplicate ACPI video bus devices for the" 1994 " same VGA controller, please try module " 1995 "parameter \"video.allow_duplicates=1\"" 1996 "if the current driver doesn't work.\n"); 1997 if (!allow_duplicates) 1998 return -ENODEV; 1999 } 2000 2001 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2002 if (!video) 2003 return -ENOMEM; 2004 2005 /* a hack to fix the duplicate name "VID" problem on T61 */ 2006 if (!strcmp(device->pnp.bus_id, "VID")) { 2007 if (instance) 2008 device->pnp.bus_id[3] = '0' + instance; 2009 instance++; 2010 } 2011 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2012 if (!strcmp(device->pnp.bus_id, "VGA")) { 2013 if (instance) 2014 device->pnp.bus_id[3] = '0' + instance; 2015 instance++; 2016 } 2017 2018 video->device = device; 2019 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2020 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2021 device->driver_data = video; 2022 2023 acpi_video_bus_find_cap(video); 2024 error = acpi_video_bus_check(video); 2025 if (error) 2026 goto err_free_video; 2027 2028 mutex_init(&video->device_list_lock); 2029 INIT_LIST_HEAD(&video->video_device_list); 2030 2031 error = acpi_video_bus_get_devices(video, device); 2032 if (error) 2033 goto err_put_video; 2034 2035 /* 2036 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0 2037 * evaluated to have functional panel brightness control. 2038 */ 2039 acpi_device_fix_up_power_children(device); 2040 2041 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2042 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2043 video->flags.multihead ? "yes" : "no", 2044 video->flags.rom ? "yes" : "no", 2045 video->flags.post ? "yes" : "no"); 2046 mutex_lock(&video_list_lock); 2047 list_add_tail(&video->entry, &video_bus_head); 2048 mutex_unlock(&video_list_lock); 2049 2050 /* 2051 * If backlight-type auto-detection is used then a native backlight may 2052 * show up later and this may change the result from video to native. 2053 * Therefor normally the userspace visible /sys/class/backlight device 2054 * gets registered separately by the GPU driver calling 2055 * acpi_video_register_backlight() when an internal panel is detected. 2056 * Register the backlight now when not using auto-detection, so that 2057 * when the kernel cmdline or DMI-quirks are used the backlight will 2058 * get registered even if acpi_video_register_backlight() is not called. 2059 */ 2060 acpi_video_run_bcl_for_osi(video); 2061 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && 2062 !auto_detect) 2063 acpi_video_bus_register_backlight(video); 2064 2065 error = acpi_video_bus_add_notify_handler(video); 2066 if (error) 2067 goto err_del; 2068 2069 error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, 2070 acpi_video_bus_notify); 2071 if (error) 2072 goto err_remove; 2073 2074 return 0; 2075 2076err_remove: 2077 acpi_video_bus_remove_notify_handler(video); 2078err_del: 2079 mutex_lock(&video_list_lock); 2080 list_del(&video->entry); 2081 mutex_unlock(&video_list_lock); 2082 acpi_video_bus_unregister_backlight(video); 2083err_put_video: 2084 acpi_video_bus_put_devices(video); 2085 kfree(video->attached_array); 2086err_free_video: 2087 kfree(video); 2088 device->driver_data = NULL; 2089 2090 return error; 2091} 2092 2093static void acpi_video_bus_remove(struct acpi_device *device) 2094{ 2095 struct acpi_video_bus *video = NULL; 2096 2097 2098 if (!device || !acpi_driver_data(device)) 2099 return; 2100 2101 video = acpi_driver_data(device); 2102 2103 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, 2104 acpi_video_bus_notify); 2105 2106 mutex_lock(&video_list_lock); 2107 list_del(&video->entry); 2108 mutex_unlock(&video_list_lock); 2109 2110 acpi_video_bus_remove_notify_handler(video); 2111 acpi_video_bus_unregister_backlight(video); 2112 acpi_video_bus_put_devices(video); 2113 2114 kfree(video->attached_array); 2115 kfree(video); 2116} 2117 2118static int __init is_i740(struct pci_dev *dev) 2119{ 2120 if (dev->device == 0x00D1) 2121 return 1; 2122 if (dev->device == 0x7000) 2123 return 1; 2124 return 0; 2125} 2126 2127static int __init intel_opregion_present(void) 2128{ 2129 int opregion = 0; 2130 struct pci_dev *dev = NULL; 2131 u32 address; 2132 2133 for_each_pci_dev(dev) { 2134 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2135 continue; 2136 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2137 continue; 2138 /* We don't want to poke around undefined i740 registers */ 2139 if (is_i740(dev)) 2140 continue; 2141 pci_read_config_dword(dev, 0xfc, &address); 2142 if (!address) 2143 continue; 2144 opregion = 1; 2145 } 2146 return opregion; 2147} 2148 2149/* Check if the chassis-type indicates there is no builtin LCD panel */ 2150static bool dmi_is_desktop(void) 2151{ 2152 const char *chassis_type; 2153 unsigned long type; 2154 2155 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2156 if (!chassis_type) 2157 return false; 2158 2159 if (kstrtoul(chassis_type, 10, &type) != 0) 2160 return false; 2161 2162 switch (type) { 2163 case 0x03: /* Desktop */ 2164 case 0x04: /* Low Profile Desktop */ 2165 case 0x05: /* Pizza Box */ 2166 case 0x06: /* Mini Tower */ 2167 case 0x07: /* Tower */ 2168 case 0x10: /* Lunch Box */ 2169 case 0x11: /* Main Server Chassis */ 2170 return true; 2171 } 2172 2173 return false; 2174} 2175 2176/* 2177 * We're seeing a lot of bogus backlight interfaces on newer machines 2178 * without a LCD such as desktops, servers and HDMI sticks. Checking the 2179 * lcd flag fixes this, enable this by default on any machines which are: 2180 * 1. Win8 ready (where we also prefer the native backlight driver, so 2181 * normally the acpi_video code should not register there anyways); *and* 2182 * 2.1 Report a desktop/server DMI chassis-type, or 2183 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for 2184 backlight control) 2185 */ 2186static bool should_check_lcd_flag(void) 2187{ 2188 if (!acpi_osi_is_win8()) 2189 return false; 2190 2191 if (dmi_is_desktop()) 2192 return true; 2193 2194 if (acpi_reduced_hardware()) 2195 return true; 2196 2197 return false; 2198} 2199 2200int acpi_video_register(void) 2201{ 2202 int ret = 0; 2203 2204 mutex_lock(®ister_count_mutex); 2205 if (register_count) { 2206 /* 2207 * if the function of acpi_video_register is already called, 2208 * don't register the acpi_video_bus again and return no error. 2209 */ 2210 goto leave; 2211 } 2212 2213 if (only_lcd == -1) 2214 only_lcd = should_check_lcd_flag(); 2215 2216 dmi_check_system(video_dmi_table); 2217 2218 ret = acpi_bus_register_driver(&acpi_video_bus); 2219 if (ret) 2220 goto leave; 2221 2222 /* 2223 * When the acpi_video_bus is loaded successfully, increase 2224 * the counter reference. 2225 */ 2226 register_count = 1; 2227 2228leave: 2229 mutex_unlock(®ister_count_mutex); 2230 return ret; 2231} 2232EXPORT_SYMBOL(acpi_video_register); 2233 2234void acpi_video_unregister(void) 2235{ 2236 mutex_lock(®ister_count_mutex); 2237 if (register_count) { 2238 acpi_bus_unregister_driver(&acpi_video_bus); 2239 register_count = 0; 2240 may_report_brightness_keys = false; 2241 } 2242 mutex_unlock(®ister_count_mutex); 2243} 2244EXPORT_SYMBOL(acpi_video_unregister); 2245 2246void acpi_video_register_backlight(void) 2247{ 2248 struct acpi_video_bus *video; 2249 2250 mutex_lock(&video_list_lock); 2251 list_for_each_entry(video, &video_bus_head, entry) 2252 acpi_video_bus_register_backlight(video); 2253 mutex_unlock(&video_list_lock); 2254} 2255EXPORT_SYMBOL(acpi_video_register_backlight); 2256 2257bool acpi_video_handles_brightness_key_presses(void) 2258{ 2259 return may_report_brightness_keys && 2260 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2261} 2262EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2263 2264/* 2265 * This is kind of nasty. Hardware using Intel chipsets may require 2266 * the video opregion code to be run first in order to initialise 2267 * state before any ACPI video calls are made. To handle this we defer 2268 * registration of the video class until the opregion code has run. 2269 */ 2270 2271static int __init acpi_video_init(void) 2272{ 2273 /* 2274 * Let the module load even if ACPI is disabled (e.g. due to 2275 * a broken BIOS) so that i915.ko can still be loaded on such 2276 * old systems without an AcpiOpRegion. 2277 * 2278 * acpi_video_register() will report -ENODEV later as well due 2279 * to acpi_disabled when i915.ko tries to register itself afterwards. 2280 */ 2281 if (acpi_disabled) 2282 return 0; 2283 2284 if (intel_opregion_present()) 2285 return 0; 2286 2287 return acpi_video_register(); 2288} 2289 2290static void __exit acpi_video_exit(void) 2291{ 2292 acpi_video_unregister(); 2293} 2294 2295module_init(acpi_video_init); 2296module_exit(acpi_video_exit); 2297