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; 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, int 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 || (length % 128)) 629 return -EINVAL; 630 631 arg0.integer.value = length / 128; 632 633 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 634 if (ACPI_FAILURE(status)) 635 return -ENODEV; 636 637 obj = buffer.pointer; 638 639 if (obj && obj->type == ACPI_TYPE_BUFFER) 640 *edid = obj; 641 else { 642 acpi_handle_debug(device->dev->handle, 643 "Invalid _DDC data for length %d\n", length); 644 status = -EFAULT; 645 kfree(obj); 646 } 647 648 return status; 649} 650 651/* bus */ 652 653/* 654 * Arg: 655 * video : video bus device pointer 656 * bios_flag : 657 * 0. The system BIOS should NOT automatically switch(toggle) 658 * the active display output. 659 * 1. The system BIOS should automatically switch (toggle) the 660 * active display output. No switch event. 661 * 2. The _DGS value should be locked. 662 * 3. The system BIOS should not automatically switch (toggle) the 663 * active display output, but instead generate the display switch 664 * event notify code. 665 * lcd_flag : 666 * 0. The system BIOS should automatically control the brightness level 667 * of the LCD when: 668 * - the power changes from AC to DC (ACPI appendix B) 669 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 670 * 1. The system BIOS should NOT automatically control the brightness 671 * level of the LCD when: 672 * - the power changes from AC to DC (ACPI appendix B) 673 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 674 * Return Value: 675 * -EINVAL wrong arg. 676 */ 677 678static int 679acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 680{ 681 acpi_status status; 682 683 if (!video->cap._DOS) 684 return 0; 685 686 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 687 return -EINVAL; 688 video->dos_setting = (lcd_flag << 2) | bios_flag; 689 status = acpi_execute_simple_method(video->device->handle, "_DOS", 690 (lcd_flag << 2) | bios_flag); 691 if (ACPI_FAILURE(status)) 692 return -EIO; 693 694 return 0; 695} 696 697/* 698 * Simple comparison function used to sort backlight levels. 699 */ 700 701static int 702acpi_video_cmp_level(const void *a, const void *b) 703{ 704 return *(int *)a - *(int *)b; 705} 706 707/* 708 * Decides if _BQC/_BCQ for this system is usable 709 * 710 * We do this by changing the level first and then read out the current 711 * brightness level, if the value does not match, find out if it is using 712 * index. If not, clear the _BQC/_BCQ capability. 713 */ 714static int acpi_video_bqc_quirk(struct acpi_video_device *device, 715 int max_level, int current_level) 716{ 717 struct acpi_video_device_brightness *br = device->brightness; 718 int result; 719 unsigned long long level; 720 int test_level; 721 722 /* don't mess with existing known broken systems */ 723 if (bqc_offset_aml_bug_workaround) 724 return 0; 725 726 /* 727 * Some systems always report current brightness level as maximum 728 * through _BQC, we need to test another value for them. However, 729 * there is a subtlety: 730 * 731 * If the _BCL package ordering is descending, the first level 732 * (br->levels[2]) is likely to be 0, and if the number of levels 733 * matches the number of steps, we might confuse a returned level to 734 * mean the index. 735 * 736 * For example: 737 * 738 * current_level = max_level = 100 739 * test_level = 0 740 * returned level = 100 741 * 742 * In this case 100 means the level, not the index, and _BCM failed. 743 * Still, if the _BCL package ordering is descending, the index of 744 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 745 * 746 * This causes all _BQC calls to return bogus values causing weird 747 * behavior from the user's perspective. For example: 748 * 749 * xbacklight -set 10; xbacklight -set 20; 750 * 751 * would flash to 90% and then slowly down to the desired level (20). 752 * 753 * The solution is simple; test anything other than the first level 754 * (e.g. 1). 755 */ 756 test_level = current_level == max_level 757 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 758 : max_level; 759 760 result = acpi_video_device_lcd_set_level(device, test_level); 761 if (result) 762 return result; 763 764 result = acpi_video_device_lcd_get_level_current(device, &level, true); 765 if (result) 766 return result; 767 768 if (level != test_level) { 769 /* buggy _BQC found, need to find out if it uses index */ 770 if (level < br->count) { 771 if (br->flags._BCL_reversed) 772 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 773 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 774 br->flags._BQC_use_index = 1; 775 } 776 777 if (!br->flags._BQC_use_index) 778 device->cap._BQC = device->cap._BCQ = 0; 779 } 780 781 return 0; 782} 783 784int acpi_video_get_levels(struct acpi_device *device, 785 struct acpi_video_device_brightness **dev_br, 786 int *pmax_level) 787{ 788 union acpi_object *obj = NULL; 789 int i, max_level = 0, count = 0, level_ac_battery = 0; 790 union acpi_object *o; 791 struct acpi_video_device_brightness *br = NULL; 792 int result = 0; 793 u32 value; 794 795 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 796 acpi_handle_debug(device->handle, 797 "Could not query available LCD brightness level\n"); 798 result = -ENODEV; 799 goto out; 800 } 801 802 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 803 result = -EINVAL; 804 goto out; 805 } 806 807 br = kzalloc(sizeof(*br), GFP_KERNEL); 808 if (!br) { 809 result = -ENOMEM; 810 goto out; 811 } 812 813 /* 814 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 815 * in order to account for buggy BIOS which don't export the first two 816 * special levels (see below) 817 */ 818 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 819 sizeof(*br->levels), 820 GFP_KERNEL); 821 if (!br->levels) { 822 result = -ENOMEM; 823 goto out_free; 824 } 825 826 for (i = 0; i < obj->package.count; i++) { 827 o = (union acpi_object *)&obj->package.elements[i]; 828 if (o->type != ACPI_TYPE_INTEGER) { 829 acpi_handle_info(device->handle, "Invalid data\n"); 830 continue; 831 } 832 value = (u32) o->integer.value; 833 /* Skip duplicate entries */ 834 if (count > ACPI_VIDEO_FIRST_LEVEL 835 && br->levels[count - 1] == value) 836 continue; 837 838 br->levels[count] = value; 839 840 if (br->levels[count] > max_level) 841 max_level = br->levels[count]; 842 count++; 843 } 844 845 /* 846 * some buggy BIOS don't export the levels 847 * when machine is on AC/Battery in _BCL package. 848 * In this case, the first two elements in _BCL packages 849 * are also supported brightness levels that OS should take care of. 850 */ 851 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 852 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 853 level_ac_battery++; 854 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 855 level_ac_battery++; 856 } 857 858 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 859 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 860 br->flags._BCL_no_ac_battery_levels = 1; 861 for (i = (count - 1 + level_ac_battery); 862 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 863 br->levels[i] = br->levels[i - level_ac_battery]; 864 count += level_ac_battery; 865 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 866 acpi_handle_info(device->handle, 867 "Too many duplicates in _BCL package"); 868 869 /* Check if the _BCL package is in a reversed order */ 870 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 871 br->flags._BCL_reversed = 1; 872 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 873 count - ACPI_VIDEO_FIRST_LEVEL, 874 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 875 acpi_video_cmp_level, NULL); 876 } else if (max_level != br->levels[count - 1]) 877 acpi_handle_info(device->handle, 878 "Found unordered _BCL package"); 879 880 br->count = count; 881 *dev_br = br; 882 if (pmax_level) 883 *pmax_level = max_level; 884 885out: 886 kfree(obj); 887 return result; 888out_free: 889 kfree(br); 890 goto out; 891} 892EXPORT_SYMBOL(acpi_video_get_levels); 893 894/* 895 * Arg: 896 * device : video output device (LCD, CRT, ..) 897 * 898 * Return Value: 899 * Maximum brightness level 900 * 901 * Allocate and initialize device->brightness. 902 */ 903 904static int 905acpi_video_init_brightness(struct acpi_video_device *device) 906{ 907 int i, max_level = 0; 908 unsigned long long level, level_old; 909 struct acpi_video_device_brightness *br = NULL; 910 int result; 911 912 result = acpi_video_get_levels(device->dev, &br, &max_level); 913 if (result) 914 return result; 915 device->brightness = br; 916 917 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 918 br->curr = level = max_level; 919 920 if (!device->cap._BQC) 921 goto set_level; 922 923 result = acpi_video_device_lcd_get_level_current(device, 924 &level_old, true); 925 if (result) 926 goto out_free_levels; 927 928 result = acpi_video_bqc_quirk(device, max_level, level_old); 929 if (result) 930 goto out_free_levels; 931 /* 932 * cap._BQC may get cleared due to _BQC is found to be broken 933 * in acpi_video_bqc_quirk, so check again here. 934 */ 935 if (!device->cap._BQC) 936 goto set_level; 937 938 level = acpi_video_bqc_value_to_level(device, level_old); 939 /* 940 * On some buggy laptops, _BQC returns an uninitialized 941 * value when invoked for the first time, i.e. 942 * level_old is invalid (no matter whether it's a level 943 * or an index). Set the backlight to max_level in this case. 944 */ 945 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 946 if (level == br->levels[i]) 947 break; 948 if (i == br->count || !level) 949 level = max_level; 950 951set_level: 952 result = acpi_video_device_lcd_set_level(device, level); 953 if (result) 954 goto out_free_levels; 955 956 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 957 br->count - ACPI_VIDEO_FIRST_LEVEL); 958 959 return 0; 960 961out_free_levels: 962 kfree(br->levels); 963 kfree(br); 964 device->brightness = NULL; 965 return result; 966} 967 968/* 969 * Arg: 970 * device : video output device (LCD, CRT, ..) 971 * 972 * Return Value: 973 * None 974 * 975 * Find out all required AML methods defined under the output 976 * device. 977 */ 978 979static void acpi_video_device_find_cap(struct acpi_video_device *device) 980{ 981 if (acpi_has_method(device->dev->handle, "_ADR")) 982 device->cap._ADR = 1; 983 if (acpi_has_method(device->dev->handle, "_BCL")) 984 device->cap._BCL = 1; 985 if (acpi_has_method(device->dev->handle, "_BCM")) 986 device->cap._BCM = 1; 987 if (acpi_has_method(device->dev->handle, "_BQC")) { 988 device->cap._BQC = 1; 989 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 990 acpi_handle_info(device->dev->handle, 991 "_BCQ is used instead of _BQC\n"); 992 device->cap._BCQ = 1; 993 } 994 995 if (acpi_has_method(device->dev->handle, "_DDC")) 996 device->cap._DDC = 1; 997} 998 999/* 1000 * Arg: 1001 * device : video output device (VGA) 1002 * 1003 * Return Value: 1004 * None 1005 * 1006 * Find out all required AML methods defined under the video bus device. 1007 */ 1008 1009static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1010{ 1011 if (acpi_has_method(video->device->handle, "_DOS")) 1012 video->cap._DOS = 1; 1013 if (acpi_has_method(video->device->handle, "_DOD")) 1014 video->cap._DOD = 1; 1015 if (acpi_has_method(video->device->handle, "_ROM")) 1016 video->cap._ROM = 1; 1017 if (acpi_has_method(video->device->handle, "_GPD")) 1018 video->cap._GPD = 1; 1019 if (acpi_has_method(video->device->handle, "_SPD")) 1020 video->cap._SPD = 1; 1021 if (acpi_has_method(video->device->handle, "_VPO")) 1022 video->cap._VPO = 1; 1023} 1024 1025/* 1026 * Check whether the video bus device has required AML method to 1027 * support the desired features 1028 */ 1029 1030static int acpi_video_bus_check(struct acpi_video_bus *video) 1031{ 1032 acpi_status status = -ENOENT; 1033 struct pci_dev *dev; 1034 1035 if (!video) 1036 return -EINVAL; 1037 1038 dev = acpi_get_pci_dev(video->device->handle); 1039 if (!dev) 1040 return -ENODEV; 1041 pci_dev_put(dev); 1042 1043 /* 1044 * Since there is no HID, CID and so on for VGA driver, we have 1045 * to check well known required nodes. 1046 */ 1047 1048 /* Does this device support video switching? */ 1049 if (video->cap._DOS || video->cap._DOD) { 1050 if (!video->cap._DOS) { 1051 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1052 acpi_device_bid(video->device)); 1053 } 1054 video->flags.multihead = 1; 1055 status = 0; 1056 } 1057 1058 /* Does this device support retrieving a video ROM? */ 1059 if (video->cap._ROM) { 1060 video->flags.rom = 1; 1061 status = 0; 1062 } 1063 1064 /* Does this device support configuring which video device to POST? */ 1065 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1066 video->flags.post = 1; 1067 status = 0; 1068 } 1069 1070 return status; 1071} 1072 1073/* 1074 * -------------------------------------------------------------------------- 1075 * Driver Interface 1076 * -------------------------------------------------------------------------- 1077 */ 1078 1079/* device interface */ 1080static struct acpi_video_device_attrib * 1081acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1082{ 1083 struct acpi_video_enumerated_device *ids; 1084 int i; 1085 1086 for (i = 0; i < video->attached_count; i++) { 1087 ids = &video->attached_array[i]; 1088 if ((ids->value.int_val & 0xffff) == device_id) 1089 return &ids->value.attrib; 1090 } 1091 1092 return NULL; 1093} 1094 1095static int 1096acpi_video_get_device_type(struct acpi_video_bus *video, 1097 unsigned long device_id) 1098{ 1099 struct acpi_video_enumerated_device *ids; 1100 int i; 1101 1102 for (i = 0; i < video->attached_count; i++) { 1103 ids = &video->attached_array[i]; 1104 if ((ids->value.int_val & 0xffff) == device_id) 1105 return ids->value.int_val; 1106 } 1107 1108 return 0; 1109} 1110 1111static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1112{ 1113 struct acpi_video_bus *video = arg; 1114 struct acpi_video_device_attrib *attribute; 1115 struct acpi_video_device *data; 1116 unsigned long long device_id; 1117 acpi_status status; 1118 int device_type; 1119 1120 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1121 /* Skip devices without _ADR instead of failing. */ 1122 if (ACPI_FAILURE(status)) 1123 goto exit; 1124 1125 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1126 if (!data) { 1127 dev_dbg(&device->dev, "Cannot attach\n"); 1128 return -ENOMEM; 1129 } 1130 1131 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1132 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1133 1134 data->device_id = device_id; 1135 data->video = video; 1136 data->dev = device; 1137 INIT_DELAYED_WORK(&data->switch_brightness_work, 1138 acpi_video_switch_brightness); 1139 1140 attribute = acpi_video_get_device_attr(video, device_id); 1141 1142 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1143 switch (attribute->display_type) { 1144 case ACPI_VIDEO_DISPLAY_CRT: 1145 data->flags.crt = 1; 1146 break; 1147 case ACPI_VIDEO_DISPLAY_TV: 1148 data->flags.tvout = 1; 1149 break; 1150 case ACPI_VIDEO_DISPLAY_DVI: 1151 data->flags.dvi = 1; 1152 break; 1153 case ACPI_VIDEO_DISPLAY_LCD: 1154 data->flags.lcd = 1; 1155 break; 1156 default: 1157 data->flags.unknown = 1; 1158 break; 1159 } 1160 if (attribute->bios_can_detect) 1161 data->flags.bios = 1; 1162 } else { 1163 /* Check for legacy IDs */ 1164 device_type = acpi_video_get_device_type(video, device_id); 1165 /* Ignore bits 16 and 18-20 */ 1166 switch (device_type & 0xffe2ffff) { 1167 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1168 data->flags.crt = 1; 1169 break; 1170 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1171 data->flags.lcd = 1; 1172 break; 1173 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1174 data->flags.tvout = 1; 1175 break; 1176 default: 1177 data->flags.unknown = 1; 1178 } 1179 } 1180 1181 acpi_video_device_bind(video, data); 1182 acpi_video_device_find_cap(data); 1183 1184 if (data->cap._BCM && data->cap._BCL) 1185 may_report_brightness_keys = true; 1186 1187 mutex_lock(&video->device_list_lock); 1188 list_add_tail(&data->entry, &video->video_device_list); 1189 mutex_unlock(&video->device_list_lock); 1190 1191exit: 1192 video->child_count++; 1193 return 0; 1194} 1195 1196/* 1197 * Arg: 1198 * video : video bus device 1199 * 1200 * Return: 1201 * none 1202 * 1203 * Enumerate the video device list of the video bus, 1204 * bind the ids with the corresponding video devices 1205 * under the video bus. 1206 */ 1207 1208static void acpi_video_device_rebind(struct acpi_video_bus *video) 1209{ 1210 struct acpi_video_device *dev; 1211 1212 mutex_lock(&video->device_list_lock); 1213 1214 list_for_each_entry(dev, &video->video_device_list, entry) 1215 acpi_video_device_bind(video, dev); 1216 1217 mutex_unlock(&video->device_list_lock); 1218} 1219 1220/* 1221 * Arg: 1222 * video : video bus device 1223 * device : video output device under the video 1224 * bus 1225 * 1226 * Return: 1227 * none 1228 * 1229 * Bind the ids with the corresponding video devices 1230 * under the video bus. 1231 */ 1232 1233static void 1234acpi_video_device_bind(struct acpi_video_bus *video, 1235 struct acpi_video_device *device) 1236{ 1237 struct acpi_video_enumerated_device *ids; 1238 int i; 1239 1240 for (i = 0; i < video->attached_count; i++) { 1241 ids = &video->attached_array[i]; 1242 if (device->device_id == (ids->value.int_val & 0xffff)) { 1243 ids->bind_info = device; 1244 acpi_handle_debug(video->device->handle, "%s: %d\n", 1245 __func__, i); 1246 } 1247 } 1248} 1249 1250static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1251{ 1252 struct acpi_video_bus *video = device->video; 1253 int i; 1254 1255 /* 1256 * If we have a broken _DOD or we have more than 8 output devices 1257 * under the graphics controller node that we can't proper deal with 1258 * in the operation region code currently, no need to test. 1259 */ 1260 if (!video->attached_count || video->child_count > 8) 1261 return true; 1262 1263 for (i = 0; i < video->attached_count; i++) { 1264 if ((video->attached_array[i].value.int_val & 0xfff) == 1265 (device->device_id & 0xfff)) 1266 return true; 1267 } 1268 1269 return false; 1270} 1271 1272/* 1273 * Arg: 1274 * video : video bus device 1275 * 1276 * Return: 1277 * < 0 : error 1278 * 1279 * Call _DOD to enumerate all devices attached to display adapter 1280 * 1281 */ 1282 1283static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1284{ 1285 int status; 1286 int count; 1287 int i; 1288 struct acpi_video_enumerated_device *active_list; 1289 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1290 union acpi_object *dod = NULL; 1291 union acpi_object *obj; 1292 1293 if (!video->cap._DOD) 1294 return AE_NOT_EXIST; 1295 1296 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1297 if (ACPI_FAILURE(status)) { 1298 acpi_handle_info(video->device->handle, 1299 "_DOD evaluation failed: %s\n", 1300 acpi_format_exception(status)); 1301 return status; 1302 } 1303 1304 dod = buffer.pointer; 1305 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1306 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1307 status = -EFAULT; 1308 goto out; 1309 } 1310 1311 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1312 dod->package.count); 1313 1314 active_list = kcalloc(1 + dod->package.count, 1315 sizeof(struct acpi_video_enumerated_device), 1316 GFP_KERNEL); 1317 if (!active_list) { 1318 status = -ENOMEM; 1319 goto out; 1320 } 1321 1322 count = 0; 1323 for (i = 0; i < dod->package.count; i++) { 1324 obj = &dod->package.elements[i]; 1325 1326 if (obj->type != ACPI_TYPE_INTEGER) { 1327 acpi_handle_info(video->device->handle, 1328 "Invalid _DOD data in element %d\n", i); 1329 continue; 1330 } 1331 1332 active_list[count].value.int_val = obj->integer.value; 1333 active_list[count].bind_info = NULL; 1334 1335 acpi_handle_debug(video->device->handle, 1336 "_DOD element[%d] = %d\n", i, 1337 (int)obj->integer.value); 1338 1339 count++; 1340 } 1341 1342 kfree(video->attached_array); 1343 1344 video->attached_array = active_list; 1345 video->attached_count = count; 1346 1347out: 1348 kfree(buffer.pointer); 1349 return status; 1350} 1351 1352static int 1353acpi_video_get_next_level(struct acpi_video_device *device, 1354 u32 level_current, u32 event) 1355{ 1356 int min, max, min_above, max_below, i, l, delta = 255; 1357 max = max_below = 0; 1358 min = min_above = 255; 1359 /* Find closest level to level_current */ 1360 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1361 l = device->brightness->levels[i]; 1362 if (abs(l - level_current) < abs(delta)) { 1363 delta = l - level_current; 1364 if (!delta) 1365 break; 1366 } 1367 } 1368 /* Adjust level_current to closest available level */ 1369 level_current += delta; 1370 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1371 l = device->brightness->levels[i]; 1372 if (l < min) 1373 min = l; 1374 if (l > max) 1375 max = l; 1376 if (l < min_above && l > level_current) 1377 min_above = l; 1378 if (l > max_below && l < level_current) 1379 max_below = l; 1380 } 1381 1382 switch (event) { 1383 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1384 return (level_current < max) ? min_above : min; 1385 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1386 return (level_current < max) ? min_above : max; 1387 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1388 return (level_current > min) ? max_below : min; 1389 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1390 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1391 return 0; 1392 default: 1393 return level_current; 1394 } 1395} 1396 1397static void 1398acpi_video_switch_brightness(struct work_struct *work) 1399{ 1400 struct acpi_video_device *device = container_of(to_delayed_work(work), 1401 struct acpi_video_device, switch_brightness_work); 1402 unsigned long long level_current, level_next; 1403 int event = device->switch_brightness_event; 1404 int result = -EINVAL; 1405 1406 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1407 if (!device->backlight) 1408 return; 1409 1410 if (!device->brightness) 1411 goto out; 1412 1413 result = acpi_video_device_lcd_get_level_current(device, 1414 &level_current, 1415 false); 1416 if (result) 1417 goto out; 1418 1419 level_next = acpi_video_get_next_level(device, level_current, event); 1420 1421 result = acpi_video_device_lcd_set_level(device, level_next); 1422 1423 if (!result) 1424 backlight_force_update(device->backlight, 1425 BACKLIGHT_UPDATE_HOTKEY); 1426 1427out: 1428 if (result) 1429 acpi_handle_info(device->dev->handle, 1430 "Failed to switch brightness\n"); 1431} 1432 1433int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1434 void **edid) 1435{ 1436 struct acpi_video_bus *video; 1437 struct acpi_video_device *video_device; 1438 union acpi_object *buffer = NULL; 1439 acpi_status status; 1440 int i, length; 1441 1442 if (!device || !acpi_driver_data(device)) 1443 return -EINVAL; 1444 1445 video = acpi_driver_data(device); 1446 1447 for (i = 0; i < video->attached_count; i++) { 1448 video_device = video->attached_array[i].bind_info; 1449 1450 if (!video_device) 1451 continue; 1452 1453 if (!video_device->cap._DDC) 1454 continue; 1455 1456 if (type) { 1457 switch (type) { 1458 case ACPI_VIDEO_DISPLAY_CRT: 1459 if (!video_device->flags.crt) 1460 continue; 1461 break; 1462 case ACPI_VIDEO_DISPLAY_TV: 1463 if (!video_device->flags.tvout) 1464 continue; 1465 break; 1466 case ACPI_VIDEO_DISPLAY_DVI: 1467 if (!video_device->flags.dvi) 1468 continue; 1469 break; 1470 case ACPI_VIDEO_DISPLAY_LCD: 1471 if (!video_device->flags.lcd) 1472 continue; 1473 break; 1474 } 1475 } else if (video_device->device_id != device_id) { 1476 continue; 1477 } 1478 1479 for (length = 512; length > 0; length -= 128) { 1480 status = acpi_video_device_EDID(video_device, &buffer, 1481 length); 1482 if (ACPI_SUCCESS(status)) 1483 break; 1484 } 1485 if (!length) 1486 continue; 1487 1488 *edid = buffer->buffer.pointer; 1489 return length; 1490 } 1491 1492 return -ENODEV; 1493} 1494EXPORT_SYMBOL(acpi_video_get_edid); 1495 1496static int 1497acpi_video_bus_get_devices(struct acpi_video_bus *video, 1498 struct acpi_device *device) 1499{ 1500 /* 1501 * There are systems where video module known to work fine regardless 1502 * of broken _DOD and ignoring returned value here doesn't cause 1503 * any issues later. 1504 */ 1505 acpi_video_device_enumerate(video); 1506 1507 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1508} 1509 1510/* acpi_video interface */ 1511 1512/* 1513 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1514 * perform any automatic brightness change on receiving a notification. 1515 */ 1516static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1517{ 1518 return acpi_video_bus_DOS(video, 0, 1519 acpi_osi_is_win8() ? 1 : 0); 1520} 1521 1522static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1523{ 1524 return acpi_video_bus_DOS(video, 0, 1525 acpi_osi_is_win8() ? 0 : 1); 1526} 1527 1528static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data) 1529{ 1530 struct acpi_device *device = data; 1531 struct acpi_video_bus *video = acpi_driver_data(device); 1532 struct input_dev *input; 1533 int keycode = 0; 1534 1535 if (!video || !video->input) 1536 return; 1537 1538 input = video->input; 1539 1540 switch (event) { 1541 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1542 * most likely via hotkey. */ 1543 keycode = KEY_SWITCHVIDEOMODE; 1544 break; 1545 1546 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1547 * connector. */ 1548 acpi_video_device_enumerate(video); 1549 acpi_video_device_rebind(video); 1550 keycode = KEY_SWITCHVIDEOMODE; 1551 break; 1552 1553 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1554 keycode = KEY_SWITCHVIDEOMODE; 1555 break; 1556 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1557 keycode = KEY_VIDEO_NEXT; 1558 break; 1559 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1560 keycode = KEY_VIDEO_PREV; 1561 break; 1562 1563 default: 1564 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1565 event); 1566 break; 1567 } 1568 1569 if (acpi_notifier_call_chain(device, event, 0)) 1570 /* Something vetoed the keypress. */ 1571 keycode = 0; 1572 1573 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1574 input_report_key(input, keycode, 1); 1575 input_sync(input); 1576 input_report_key(input, keycode, 0); 1577 input_sync(input); 1578 } 1579} 1580 1581static void brightness_switch_event(struct acpi_video_device *video_device, 1582 u32 event) 1583{ 1584 if (!brightness_switch_enabled) 1585 return; 1586 1587 video_device->switch_brightness_event = event; 1588 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1589} 1590 1591static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1592{ 1593 struct acpi_video_device *video_device = data; 1594 struct acpi_device *device = NULL; 1595 struct acpi_video_bus *bus; 1596 struct input_dev *input; 1597 int keycode = 0; 1598 1599 if (!video_device) 1600 return; 1601 1602 device = video_device->dev; 1603 bus = video_device->video; 1604 input = bus->input; 1605 1606 if (hw_changes_brightness > 0) { 1607 if (video_device->backlight) 1608 backlight_force_update(video_device->backlight, 1609 BACKLIGHT_UPDATE_HOTKEY); 1610 acpi_notifier_call_chain(device, event, 0); 1611 return; 1612 } 1613 1614 switch (event) { 1615 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1616 brightness_switch_event(video_device, event); 1617 keycode = KEY_BRIGHTNESS_CYCLE; 1618 break; 1619 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1620 brightness_switch_event(video_device, event); 1621 keycode = KEY_BRIGHTNESSUP; 1622 break; 1623 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1624 brightness_switch_event(video_device, event); 1625 keycode = KEY_BRIGHTNESSDOWN; 1626 break; 1627 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1628 brightness_switch_event(video_device, event); 1629 keycode = KEY_BRIGHTNESS_ZERO; 1630 break; 1631 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1632 brightness_switch_event(video_device, event); 1633 keycode = KEY_DISPLAY_OFF; 1634 break; 1635 default: 1636 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1637 break; 1638 } 1639 1640 if (keycode) 1641 may_report_brightness_keys = true; 1642 1643 acpi_notifier_call_chain(device, event, 0); 1644 1645 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1646 input_report_key(input, keycode, 1); 1647 input_sync(input); 1648 input_report_key(input, keycode, 0); 1649 input_sync(input); 1650 } 1651} 1652 1653static int acpi_video_resume(struct notifier_block *nb, 1654 unsigned long val, void *ign) 1655{ 1656 struct acpi_video_bus *video; 1657 struct acpi_video_device *video_device; 1658 int i; 1659 1660 switch (val) { 1661 case PM_POST_HIBERNATION: 1662 case PM_POST_SUSPEND: 1663 case PM_POST_RESTORE: 1664 video = container_of(nb, struct acpi_video_bus, pm_nb); 1665 1666 dev_info(&video->device->dev, "Restoring backlight state\n"); 1667 1668 for (i = 0; i < video->attached_count; i++) { 1669 video_device = video->attached_array[i].bind_info; 1670 if (video_device && video_device->brightness) 1671 acpi_video_device_lcd_set_level(video_device, 1672 video_device->brightness->curr); 1673 } 1674 1675 return NOTIFY_OK; 1676 } 1677 return NOTIFY_DONE; 1678} 1679 1680static acpi_status 1681acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1682 void **return_value) 1683{ 1684 struct acpi_device *device = context; 1685 struct acpi_device *sibling; 1686 1687 if (handle == device->handle) 1688 return AE_CTRL_TERMINATE; 1689 1690 sibling = acpi_fetch_acpi_dev(handle); 1691 if (!sibling) 1692 return AE_OK; 1693 1694 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1695 return AE_ALREADY_EXISTS; 1696 1697 return AE_OK; 1698} 1699 1700static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1701{ 1702 struct backlight_properties props; 1703 struct pci_dev *pdev; 1704 acpi_handle acpi_parent; 1705 struct device *parent = NULL; 1706 int result; 1707 static int count; 1708 char *name; 1709 1710 result = acpi_video_init_brightness(device); 1711 if (result) 1712 return; 1713 1714 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1715 if (!name) 1716 return; 1717 count++; 1718 1719 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) { 1720 pdev = acpi_get_pci_dev(acpi_parent); 1721 if (pdev) { 1722 parent = &pdev->dev; 1723 pci_dev_put(pdev); 1724 } 1725 } 1726 1727 memset(&props, 0, sizeof(struct backlight_properties)); 1728 props.type = BACKLIGHT_FIRMWARE; 1729 props.max_brightness = 1730 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1731 device->backlight = backlight_device_register(name, 1732 parent, 1733 device, 1734 &acpi_backlight_ops, 1735 &props); 1736 kfree(name); 1737 if (IS_ERR(device->backlight)) { 1738 device->backlight = NULL; 1739 return; 1740 } 1741 1742 /* 1743 * Save current brightness level in case we have to restore it 1744 * before acpi_video_device_lcd_set_level() is called next time. 1745 */ 1746 device->backlight->props.brightness = 1747 acpi_video_get_brightness(device->backlight); 1748 1749 device->cooling_dev = thermal_cooling_device_register("LCD", device, 1750 &video_cooling_ops); 1751 if (IS_ERR(device->cooling_dev)) { 1752 /* 1753 * Set cooling_dev to NULL so we don't crash trying to free it. 1754 * Also, why the hell we are returning early and not attempt to 1755 * register video output if cooling device registration failed? 1756 * -- dtor 1757 */ 1758 device->cooling_dev = NULL; 1759 return; 1760 } 1761 1762 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1763 device->cooling_dev->id); 1764 result = sysfs_create_link(&device->dev->dev.kobj, 1765 &device->cooling_dev->device.kobj, 1766 "thermal_cooling"); 1767 if (result) 1768 pr_info("sysfs link creation failed\n"); 1769 1770 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1771 &device->dev->dev.kobj, "device"); 1772 if (result) 1773 pr_info("Reverse sysfs link creation failed\n"); 1774} 1775 1776static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1777{ 1778 struct acpi_video_device *dev; 1779 union acpi_object *levels; 1780 1781 mutex_lock(&video->device_list_lock); 1782 list_for_each_entry(dev, &video->video_device_list, entry) { 1783 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1784 kfree(levels); 1785 } 1786 mutex_unlock(&video->device_list_lock); 1787} 1788 1789static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1790{ 1791 /* 1792 * Do not create backlight device for video output 1793 * device that is not in the enumerated list. 1794 */ 1795 if (!acpi_video_device_in_dod(dev)) { 1796 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1797 return false; 1798 } 1799 1800 if (only_lcd) 1801 return dev->flags.lcd; 1802 return true; 1803} 1804 1805static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1806{ 1807 struct acpi_video_device *dev; 1808 1809 if (video->backlight_registered) 1810 return 0; 1811 1812 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1813 return 0; 1814 1815 mutex_lock(&video->device_list_lock); 1816 list_for_each_entry(dev, &video->video_device_list, entry) { 1817 if (acpi_video_should_register_backlight(dev)) 1818 acpi_video_dev_register_backlight(dev); 1819 } 1820 mutex_unlock(&video->device_list_lock); 1821 1822 video->backlight_registered = true; 1823 1824 video->pm_nb.notifier_call = acpi_video_resume; 1825 video->pm_nb.priority = 0; 1826 return register_pm_notifier(&video->pm_nb); 1827} 1828 1829static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1830{ 1831 if (device->backlight) { 1832 backlight_device_unregister(device->backlight); 1833 device->backlight = NULL; 1834 } 1835 if (device->brightness) { 1836 kfree(device->brightness->levels); 1837 kfree(device->brightness); 1838 device->brightness = NULL; 1839 } 1840 if (device->cooling_dev) { 1841 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1842 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1843 thermal_cooling_device_unregister(device->cooling_dev); 1844 device->cooling_dev = NULL; 1845 } 1846} 1847 1848static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1849{ 1850 struct acpi_video_device *dev; 1851 int error; 1852 1853 if (!video->backlight_registered) 1854 return 0; 1855 1856 error = unregister_pm_notifier(&video->pm_nb); 1857 1858 mutex_lock(&video->device_list_lock); 1859 list_for_each_entry(dev, &video->video_device_list, entry) 1860 acpi_video_dev_unregister_backlight(dev); 1861 mutex_unlock(&video->device_list_lock); 1862 1863 video->backlight_registered = false; 1864 1865 return error; 1866} 1867 1868static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1869{ 1870 acpi_status status; 1871 struct acpi_device *adev = device->dev; 1872 1873 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1874 acpi_video_device_notify, device); 1875 if (ACPI_FAILURE(status)) 1876 dev_err(&adev->dev, "Error installing notify handler\n"); 1877 else 1878 device->flags.notify = 1; 1879} 1880 1881static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1882{ 1883 struct input_dev *input; 1884 struct acpi_video_device *dev; 1885 int error; 1886 1887 video->input = input = input_allocate_device(); 1888 if (!input) { 1889 error = -ENOMEM; 1890 goto out; 1891 } 1892 1893 error = acpi_video_bus_start_devices(video); 1894 if (error) 1895 goto err_free_input; 1896 1897 snprintf(video->phys, sizeof(video->phys), 1898 "%s/video/input0", acpi_device_hid(video->device)); 1899 1900 input->name = acpi_device_name(video->device); 1901 input->phys = video->phys; 1902 input->id.bustype = BUS_HOST; 1903 input->id.product = 0x06; 1904 input->dev.parent = &video->device->dev; 1905 input->evbit[0] = BIT(EV_KEY); 1906 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1907 set_bit(KEY_VIDEO_NEXT, input->keybit); 1908 set_bit(KEY_VIDEO_PREV, input->keybit); 1909 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1910 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1911 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1912 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1913 set_bit(KEY_DISPLAY_OFF, input->keybit); 1914 1915 error = input_register_device(input); 1916 if (error) 1917 goto err_stop_dev; 1918 1919 mutex_lock(&video->device_list_lock); 1920 list_for_each_entry(dev, &video->video_device_list, entry) 1921 acpi_video_dev_add_notify_handler(dev); 1922 mutex_unlock(&video->device_list_lock); 1923 1924 return 0; 1925 1926err_stop_dev: 1927 acpi_video_bus_stop_devices(video); 1928err_free_input: 1929 input_free_device(input); 1930 video->input = NULL; 1931out: 1932 return error; 1933} 1934 1935static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1936{ 1937 if (dev->flags.notify) { 1938 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1939 acpi_video_device_notify); 1940 dev->flags.notify = 0; 1941 } 1942} 1943 1944static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1945{ 1946 struct acpi_video_device *dev; 1947 1948 mutex_lock(&video->device_list_lock); 1949 list_for_each_entry(dev, &video->video_device_list, entry) 1950 acpi_video_dev_remove_notify_handler(dev); 1951 mutex_unlock(&video->device_list_lock); 1952 1953 acpi_video_bus_stop_devices(video); 1954 input_unregister_device(video->input); 1955 video->input = NULL; 1956} 1957 1958static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1959{ 1960 struct acpi_video_device *dev, *next; 1961 1962 mutex_lock(&video->device_list_lock); 1963 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1964 list_del(&dev->entry); 1965 kfree(dev); 1966 } 1967 mutex_unlock(&video->device_list_lock); 1968 1969 return 0; 1970} 1971 1972static int instance; 1973 1974static int acpi_video_bus_add(struct acpi_device *device) 1975{ 1976 struct acpi_video_bus *video; 1977 bool auto_detect; 1978 int error; 1979 acpi_status status; 1980 1981 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1982 acpi_dev_parent(device)->handle, 1, 1983 acpi_video_bus_match, NULL, 1984 device, NULL); 1985 if (status == AE_ALREADY_EXISTS) { 1986 pr_info(FW_BUG 1987 "Duplicate ACPI video bus devices for the" 1988 " same VGA controller, please try module " 1989 "parameter \"video.allow_duplicates=1\"" 1990 "if the current driver doesn't work.\n"); 1991 if (!allow_duplicates) 1992 return -ENODEV; 1993 } 1994 1995 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 1996 if (!video) 1997 return -ENOMEM; 1998 1999 /* a hack to fix the duplicate name "VID" problem on T61 */ 2000 if (!strcmp(device->pnp.bus_id, "VID")) { 2001 if (instance) 2002 device->pnp.bus_id[3] = '0' + instance; 2003 instance++; 2004 } 2005 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2006 if (!strcmp(device->pnp.bus_id, "VGA")) { 2007 if (instance) 2008 device->pnp.bus_id[3] = '0' + instance; 2009 instance++; 2010 } 2011 2012 video->device = device; 2013 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2014 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2015 device->driver_data = video; 2016 2017 acpi_video_bus_find_cap(video); 2018 error = acpi_video_bus_check(video); 2019 if (error) 2020 goto err_free_video; 2021 2022 mutex_init(&video->device_list_lock); 2023 INIT_LIST_HEAD(&video->video_device_list); 2024 2025 error = acpi_video_bus_get_devices(video, device); 2026 if (error) 2027 goto err_put_video; 2028 2029 /* 2030 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0 2031 * evaluated to have functional panel brightness control. 2032 */ 2033 acpi_device_fix_up_power_children(device); 2034 2035 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2036 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2037 video->flags.multihead ? "yes" : "no", 2038 video->flags.rom ? "yes" : "no", 2039 video->flags.post ? "yes" : "no"); 2040 mutex_lock(&video_list_lock); 2041 list_add_tail(&video->entry, &video_bus_head); 2042 mutex_unlock(&video_list_lock); 2043 2044 /* 2045 * If backlight-type auto-detection is used then a native backlight may 2046 * show up later and this may change the result from video to native. 2047 * Therefor normally the userspace visible /sys/class/backlight device 2048 * gets registered separately by the GPU driver calling 2049 * acpi_video_register_backlight() when an internal panel is detected. 2050 * Register the backlight now when not using auto-detection, so that 2051 * when the kernel cmdline or DMI-quirks are used the backlight will 2052 * get registered even if acpi_video_register_backlight() is not called. 2053 */ 2054 acpi_video_run_bcl_for_osi(video); 2055 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && 2056 !auto_detect) 2057 acpi_video_bus_register_backlight(video); 2058 2059 error = acpi_video_bus_add_notify_handler(video); 2060 if (error) 2061 goto err_del; 2062 2063 error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, 2064 acpi_video_bus_notify, device); 2065 if (error) 2066 goto err_remove; 2067 2068 return 0; 2069 2070err_remove: 2071 acpi_video_bus_remove_notify_handler(video); 2072err_del: 2073 mutex_lock(&video_list_lock); 2074 list_del(&video->entry); 2075 mutex_unlock(&video_list_lock); 2076 acpi_video_bus_unregister_backlight(video); 2077err_put_video: 2078 acpi_video_bus_put_devices(video); 2079 kfree(video->attached_array); 2080err_free_video: 2081 kfree(video); 2082 device->driver_data = NULL; 2083 2084 return error; 2085} 2086 2087static void acpi_video_bus_remove(struct acpi_device *device) 2088{ 2089 struct acpi_video_bus *video = NULL; 2090 2091 2092 if (!device || !acpi_driver_data(device)) 2093 return; 2094 2095 video = acpi_driver_data(device); 2096 2097 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, 2098 acpi_video_bus_notify); 2099 2100 mutex_lock(&video_list_lock); 2101 list_del(&video->entry); 2102 mutex_unlock(&video_list_lock); 2103 2104 acpi_video_bus_remove_notify_handler(video); 2105 acpi_video_bus_unregister_backlight(video); 2106 acpi_video_bus_put_devices(video); 2107 2108 kfree(video->attached_array); 2109 kfree(video); 2110} 2111 2112static int __init is_i740(struct pci_dev *dev) 2113{ 2114 if (dev->device == 0x00D1) 2115 return 1; 2116 if (dev->device == 0x7000) 2117 return 1; 2118 return 0; 2119} 2120 2121static int __init intel_opregion_present(void) 2122{ 2123 int opregion = 0; 2124 struct pci_dev *dev = NULL; 2125 u32 address; 2126 2127 for_each_pci_dev(dev) { 2128 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2129 continue; 2130 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2131 continue; 2132 /* We don't want to poke around undefined i740 registers */ 2133 if (is_i740(dev)) 2134 continue; 2135 pci_read_config_dword(dev, 0xfc, &address); 2136 if (!address) 2137 continue; 2138 opregion = 1; 2139 } 2140 return opregion; 2141} 2142 2143int acpi_video_register(void) 2144{ 2145 int ret = 0; 2146 2147 mutex_lock(®ister_count_mutex); 2148 if (register_count) { 2149 /* 2150 * if the function of acpi_video_register is already called, 2151 * don't register the acpi_video_bus again and return no error. 2152 */ 2153 goto leave; 2154 } 2155 2156 dmi_check_system(video_dmi_table); 2157 2158 ret = acpi_bus_register_driver(&acpi_video_bus); 2159 if (ret) 2160 goto leave; 2161 2162 /* 2163 * When the acpi_video_bus is loaded successfully, increase 2164 * the counter reference. 2165 */ 2166 register_count = 1; 2167 2168leave: 2169 mutex_unlock(®ister_count_mutex); 2170 return ret; 2171} 2172EXPORT_SYMBOL(acpi_video_register); 2173 2174void acpi_video_unregister(void) 2175{ 2176 mutex_lock(®ister_count_mutex); 2177 if (register_count) { 2178 acpi_bus_unregister_driver(&acpi_video_bus); 2179 register_count = 0; 2180 may_report_brightness_keys = false; 2181 } 2182 mutex_unlock(®ister_count_mutex); 2183} 2184EXPORT_SYMBOL(acpi_video_unregister); 2185 2186void acpi_video_register_backlight(void) 2187{ 2188 struct acpi_video_bus *video; 2189 2190 mutex_lock(&video_list_lock); 2191 list_for_each_entry(video, &video_bus_head, entry) 2192 acpi_video_bus_register_backlight(video); 2193 mutex_unlock(&video_list_lock); 2194} 2195EXPORT_SYMBOL(acpi_video_register_backlight); 2196 2197bool acpi_video_handles_brightness_key_presses(void) 2198{ 2199 return may_report_brightness_keys && 2200 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2201} 2202EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2203 2204/* 2205 * This is kind of nasty. Hardware using Intel chipsets may require 2206 * the video opregion code to be run first in order to initialise 2207 * state before any ACPI video calls are made. To handle this we defer 2208 * registration of the video class until the opregion code has run. 2209 */ 2210 2211static int __init acpi_video_init(void) 2212{ 2213 /* 2214 * Let the module load even if ACPI is disabled (e.g. due to 2215 * a broken BIOS) so that i915.ko can still be loaded on such 2216 * old systems without an AcpiOpRegion. 2217 * 2218 * acpi_video_register() will report -ENODEV later as well due 2219 * to acpi_disabled when i915.ko tries to register itself afterwards. 2220 */ 2221 if (acpi_disabled) 2222 return 0; 2223 2224 if (intel_opregion_present()) 2225 return 0; 2226 2227 return acpi_video_register(); 2228} 2229 2230static void __exit acpi_video_exit(void) 2231{ 2232 acpi_video_unregister(); 2233} 2234 2235module_init(acpi_video_init); 2236module_exit(acpi_video_exit); 2237