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#include <linux/kernel.h> 11#include <linux/module.h> 12#include <linux/init.h> 13#include <linux/types.h> 14#include <linux/list.h> 15#include <linux/mutex.h> 16#include <linux/input.h> 17#include <linux/backlight.h> 18#include <linux/thermal.h> 19#include <linux/sort.h> 20#include <linux/pci.h> 21#include <linux/pci_ids.h> 22#include <linux/slab.h> 23#include <linux/dmi.h> 24#include <linux/suspend.h> 25#include <linux/acpi.h> 26#include <acpi/video.h> 27#include <linux/uaccess.h> 28 29#define PREFIX "ACPI: " 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 36#define _COMPONENT ACPI_VIDEO_COMPONENT 37ACPI_MODULE_NAME("video"); 38 39MODULE_AUTHOR("Bruno Ducrot"); 40MODULE_DESCRIPTION("ACPI Video Driver"); 41MODULE_LICENSE("GPL"); 42 43static bool brightness_switch_enabled = true; 44module_param(brightness_switch_enabled, bool, 0644); 45 46/* 47 * By default, we don't allow duplicate ACPI video bus devices 48 * under the same VGA controller 49 */ 50static bool allow_duplicates; 51module_param(allow_duplicates, bool, 0644); 52 53static int disable_backlight_sysfs_if = -1; 54module_param(disable_backlight_sysfs_if, int, 0444); 55 56#define REPORT_OUTPUT_KEY_EVENTS 0x01 57#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 58static int report_key_events = -1; 59module_param(report_key_events, int, 0644); 60MODULE_PARM_DESC(report_key_events, 61 "0: none, 1: output changes, 2: brightness changes, 3: all"); 62 63static int hw_changes_brightness = -1; 64module_param(hw_changes_brightness, int, 0644); 65MODULE_PARM_DESC(hw_changes_brightness, 66 "Set this to 1 on buggy hw which changes the brightness itself when " 67 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); 68 69/* 70 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 71 * assumed even if not actually set. 72 */ 73static bool device_id_scheme = false; 74module_param(device_id_scheme, bool, 0444); 75 76static int only_lcd = -1; 77module_param(only_lcd, int, 0444); 78 79static int register_count; 80static DEFINE_MUTEX(register_count_mutex); 81static DEFINE_MUTEX(video_list_lock); 82static LIST_HEAD(video_bus_head); 83static int acpi_video_bus_add(struct acpi_device *device); 84static int acpi_video_bus_remove(struct acpi_device *device); 85static void acpi_video_bus_notify(struct acpi_device *device, u32 event); 86void acpi_video_detect_exit(void); 87 88/* 89 * Indices in the _BCL method response: the first two items are special, 90 * the rest are all supported levels. 91 * 92 * See page 575 of the ACPI spec 3.0 93 */ 94enum acpi_video_level_idx { 95 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 96 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 97 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 98}; 99 100static const struct acpi_device_id video_device_ids[] = { 101 {ACPI_VIDEO_HID, 0}, 102 {"", 0}, 103}; 104MODULE_DEVICE_TABLE(acpi, video_device_ids); 105 106static struct acpi_driver acpi_video_bus = { 107 .name = "video", 108 .class = ACPI_VIDEO_CLASS, 109 .ids = video_device_ids, 110 .ops = { 111 .add = acpi_video_bus_add, 112 .remove = acpi_video_bus_remove, 113 .notify = acpi_video_bus_notify, 114 }, 115}; 116 117struct acpi_video_bus_flags { 118 u8 multihead:1; /* can switch video heads */ 119 u8 rom:1; /* can retrieve a video rom */ 120 u8 post:1; /* can configure the head to */ 121 u8 reserved:5; 122}; 123 124struct acpi_video_bus_cap { 125 u8 _DOS:1; /* Enable/Disable output switching */ 126 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 127 u8 _ROM:1; /* Get ROM Data */ 128 u8 _GPD:1; /* Get POST Device */ 129 u8 _SPD:1; /* Set POST Device */ 130 u8 _VPO:1; /* Video POST Options */ 131 u8 reserved:2; 132}; 133 134struct acpi_video_device_attrib { 135 u32 display_index:4; /* A zero-based instance of the Display */ 136 u32 display_port_attachment:4; /* This field differentiates the display type */ 137 u32 display_type:4; /* Describe the specific type in use */ 138 u32 vendor_specific:4; /* Chipset Vendor Specific */ 139 u32 bios_can_detect:1; /* BIOS can detect the device */ 140 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 141 the VGA device. */ 142 u32 pipe_id:3; /* For VGA multiple-head devices. */ 143 u32 reserved:10; /* Must be 0 */ 144 145 /* 146 * The device ID might not actually follow the scheme described by this 147 * struct acpi_video_device_attrib. If it does, then this bit 148 * device_id_scheme is set; otherwise, other fields should be ignored. 149 * 150 * (but also see the global flag device_id_scheme) 151 */ 152 u32 device_id_scheme:1; 153}; 154 155struct acpi_video_enumerated_device { 156 union { 157 u32 int_val; 158 struct acpi_video_device_attrib attrib; 159 } value; 160 struct acpi_video_device *bind_info; 161}; 162 163struct acpi_video_bus { 164 struct acpi_device *device; 165 bool backlight_registered; 166 u8 dos_setting; 167 struct acpi_video_enumerated_device *attached_array; 168 u8 attached_count; 169 u8 child_count; 170 struct acpi_video_bus_cap cap; 171 struct acpi_video_bus_flags flags; 172 struct list_head video_device_list; 173 struct mutex device_list_lock; /* protects video_device_list */ 174 struct list_head entry; 175 struct input_dev *input; 176 char phys[32]; /* for input device */ 177 struct notifier_block pm_nb; 178}; 179 180struct acpi_video_device_flags { 181 u8 crt:1; 182 u8 lcd:1; 183 u8 tvout:1; 184 u8 dvi:1; 185 u8 bios:1; 186 u8 unknown:1; 187 u8 notify:1; 188 u8 reserved:1; 189}; 190 191struct acpi_video_device_cap { 192 u8 _ADR:1; /* Return the unique ID */ 193 u8 _BCL:1; /* Query list of brightness control levels supported */ 194 u8 _BCM:1; /* Set the brightness level */ 195 u8 _BQC:1; /* Get current brightness level */ 196 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 197 u8 _DDC:1; /* Return the EDID for this device */ 198}; 199 200struct acpi_video_device { 201 unsigned long device_id; 202 struct acpi_video_device_flags flags; 203 struct acpi_video_device_cap cap; 204 struct list_head entry; 205 struct delayed_work switch_brightness_work; 206 int switch_brightness_event; 207 struct acpi_video_bus *video; 208 struct acpi_device *dev; 209 struct acpi_video_device_brightness *brightness; 210 struct backlight_device *backlight; 211 struct thermal_cooling_device *cooling_dev; 212}; 213 214static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 215static void acpi_video_device_rebind(struct acpi_video_bus *video); 216static void acpi_video_device_bind(struct acpi_video_bus *video, 217 struct acpi_video_device *device); 218static int acpi_video_device_enumerate(struct acpi_video_bus *video); 219static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 220 int level); 221static int acpi_video_device_lcd_get_level_current( 222 struct acpi_video_device *device, 223 unsigned long long *level, bool raw); 224static int acpi_video_get_next_level(struct acpi_video_device *device, 225 u32 level_current, u32 event); 226static void acpi_video_switch_brightness(struct work_struct *work); 227 228/* backlight device sysfs support */ 229static int acpi_video_get_brightness(struct backlight_device *bd) 230{ 231 unsigned long long cur_level; 232 int i; 233 struct acpi_video_device *vd = bl_get_data(bd); 234 235 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 236 return -EINVAL; 237 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 238 if (vd->brightness->levels[i] == cur_level) 239 return i - ACPI_VIDEO_FIRST_LEVEL; 240 } 241 return 0; 242} 243 244static int acpi_video_set_brightness(struct backlight_device *bd) 245{ 246 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 247 struct acpi_video_device *vd = bl_get_data(bd); 248 249 cancel_delayed_work(&vd->switch_brightness_work); 250 return acpi_video_device_lcd_set_level(vd, 251 vd->brightness->levels[request_level]); 252} 253 254static const struct backlight_ops acpi_backlight_ops = { 255 .get_brightness = acpi_video_get_brightness, 256 .update_status = acpi_video_set_brightness, 257}; 258 259/* thermal cooling device callbacks */ 260static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 261 unsigned long *state) 262{ 263 struct acpi_device *device = cooling_dev->devdata; 264 struct acpi_video_device *video = acpi_driver_data(device); 265 266 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 267 return 0; 268} 269 270static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 271 unsigned long *state) 272{ 273 struct acpi_device *device = cooling_dev->devdata; 274 struct acpi_video_device *video = acpi_driver_data(device); 275 unsigned long long level; 276 int offset; 277 278 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 279 return -EINVAL; 280 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 281 offset++) 282 if (level == video->brightness->levels[offset]) { 283 *state = video->brightness->count - offset - 1; 284 return 0; 285 } 286 287 return -EINVAL; 288} 289 290static int 291video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 292{ 293 struct acpi_device *device = cooling_dev->devdata; 294 struct acpi_video_device *video = acpi_driver_data(device); 295 int level; 296 297 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 298 return -EINVAL; 299 300 state = video->brightness->count - state; 301 level = video->brightness->levels[state - 1]; 302 return acpi_video_device_lcd_set_level(video, level); 303} 304 305static const struct thermal_cooling_device_ops video_cooling_ops = { 306 .get_max_state = video_get_max_state, 307 .get_cur_state = video_get_cur_state, 308 .set_cur_state = video_set_cur_state, 309}; 310 311/* 312 * -------------------------------------------------------------------------- 313 * Video Management 314 * -------------------------------------------------------------------------- 315 */ 316 317static int 318acpi_video_device_lcd_query_levels(acpi_handle handle, 319 union acpi_object **levels) 320{ 321 int status; 322 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 323 union acpi_object *obj; 324 325 326 *levels = NULL; 327 328 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 329 if (!ACPI_SUCCESS(status)) 330 return status; 331 obj = (union acpi_object *)buffer.pointer; 332 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 333 printk(KERN_ERR PREFIX "Invalid _BCL data\n"); 334 status = -EFAULT; 335 goto err; 336 } 337 338 *levels = obj; 339 340 return 0; 341 342err: 343 kfree(buffer.pointer); 344 345 return status; 346} 347 348static int 349acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 350{ 351 int status; 352 int state; 353 354 status = acpi_execute_simple_method(device->dev->handle, 355 "_BCM", level); 356 if (ACPI_FAILURE(status)) { 357 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed")); 358 return -EIO; 359 } 360 361 device->brightness->curr = level; 362 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 363 state++) 364 if (level == device->brightness->levels[state]) { 365 if (device->backlight) 366 device->backlight->props.brightness = 367 state - ACPI_VIDEO_FIRST_LEVEL; 368 return 0; 369 } 370 371 ACPI_ERROR((AE_INFO, "Current brightness invalid")); 372 return -EINVAL; 373} 374 375/* 376 * For some buggy _BQC methods, we need to add a constant value to 377 * the _BQC return value to get the actual current brightness level 378 */ 379 380static int bqc_offset_aml_bug_workaround; 381static int video_set_bqc_offset(const struct dmi_system_id *d) 382{ 383 bqc_offset_aml_bug_workaround = 9; 384 return 0; 385} 386 387static int video_disable_backlight_sysfs_if( 388 const struct dmi_system_id *d) 389{ 390 if (disable_backlight_sysfs_if == -1) 391 disable_backlight_sysfs_if = 1; 392 return 0; 393} 394 395static int video_set_device_id_scheme(const struct dmi_system_id *d) 396{ 397 device_id_scheme = true; 398 return 0; 399} 400 401static int video_enable_only_lcd(const struct dmi_system_id *d) 402{ 403 only_lcd = true; 404 return 0; 405} 406 407static int video_set_report_key_events(const struct dmi_system_id *id) 408{ 409 if (report_key_events == -1) 410 report_key_events = (uintptr_t)id->driver_data; 411 return 0; 412} 413 414static int video_hw_changes_brightness( 415 const struct dmi_system_id *d) 416{ 417 if (hw_changes_brightness == -1) 418 hw_changes_brightness = 1; 419 return 0; 420} 421 422static const struct dmi_system_id video_dmi_table[] = { 423 /* 424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 425 */ 426 { 427 .callback = video_set_bqc_offset, 428 .ident = "Acer Aspire 5720", 429 .matches = { 430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 432 }, 433 }, 434 { 435 .callback = video_set_bqc_offset, 436 .ident = "Acer Aspire 5710Z", 437 .matches = { 438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 440 }, 441 }, 442 { 443 .callback = video_set_bqc_offset, 444 .ident = "eMachines E510", 445 .matches = { 446 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 447 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 448 }, 449 }, 450 { 451 .callback = video_set_bqc_offset, 452 .ident = "Acer Aspire 5315", 453 .matches = { 454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 456 }, 457 }, 458 { 459 .callback = video_set_bqc_offset, 460 .ident = "Acer Aspire 7720", 461 .matches = { 462 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 463 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 464 }, 465 }, 466 467 /* 468 * Some machines have a broken acpi-video interface for brightness 469 * control, but still need an acpi_video_device_lcd_set_level() call 470 * on resume to turn the backlight power on. We Enable backlight 471 * control on these systems, but do not register a backlight sysfs 472 * as brightness control does not work. 473 */ 474 { 475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 476 .callback = video_disable_backlight_sysfs_if, 477 .ident = "Toshiba Portege R700", 478 .matches = { 479 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 480 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"), 481 }, 482 }, 483 { 484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */ 485 .callback = video_disable_backlight_sysfs_if, 486 .ident = "Toshiba Portege R830", 487 .matches = { 488 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 489 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"), 490 }, 491 }, 492 { 493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 494 .callback = video_disable_backlight_sysfs_if, 495 .ident = "Toshiba Satellite R830", 496 .matches = { 497 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 498 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"), 499 }, 500 }, 501 { 502 .callback = video_disable_backlight_sysfs_if, 503 .ident = "Toshiba Satellite Z830", 504 .matches = { 505 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 506 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Z830"), 507 }, 508 }, 509 { 510 .callback = video_disable_backlight_sysfs_if, 511 .ident = "Toshiba Portege Z830", 512 .matches = { 513 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 514 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE Z830"), 515 }, 516 }, 517 /* 518 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 519 * but the IDs actually follow the Device ID Scheme. 520 */ 521 { 522 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 523 .callback = video_set_device_id_scheme, 524 .ident = "ESPRIMO Mobile M9410", 525 .matches = { 526 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 527 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 528 }, 529 }, 530 /* 531 * Some machines have multiple video output devices, but only the one 532 * that is the type of LCD can do the backlight control so we should not 533 * register backlight interface for other video output devices. 534 */ 535 { 536 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 537 .callback = video_enable_only_lcd, 538 .ident = "ESPRIMO Mobile M9410", 539 .matches = { 540 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 541 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 542 }, 543 }, 544 /* 545 * Some machines report wrong key events on the acpi-bus, suppress 546 * key event reporting on these. Note this is only intended to work 547 * around events which are plain wrong. In some cases we get double 548 * events, in this case acpi-video is considered the canonical source 549 * and the events from the other source should be filtered. E.g. 550 * by calling acpi_video_handles_brightness_key_presses() from the 551 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 552 */ 553 { 554 .callback = video_set_report_key_events, 555 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 556 .ident = "Dell Vostro V131", 557 .matches = { 558 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 559 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 560 }, 561 }, 562 { 563 .callback = video_set_report_key_events, 564 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 565 .ident = "Dell Vostro 3350", 566 .matches = { 567 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 568 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), 569 }, 570 }, 571 { 572 .callback = video_set_report_key_events, 573 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 574 .ident = "COLORFUL X15 AT 23", 575 .matches = { 576 DMI_MATCH(DMI_SYS_VENDOR, "COLORFUL"), 577 DMI_MATCH(DMI_PRODUCT_NAME, "X15 AT 23"), 578 }, 579 }, 580 /* 581 * Some machines change the brightness themselves when a brightness 582 * hotkey gets pressed, despite us telling them not to. In this case 583 * acpi_video_device_notify() should only call backlight_force_update( 584 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 585 */ 586 { 587 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 588 .callback = video_hw_changes_brightness, 589 .ident = "Packard Bell EasyNote MZ35", 590 .matches = { 591 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 592 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 593 }, 594 }, 595 {} 596}; 597 598static unsigned long long 599acpi_video_bqc_value_to_level(struct acpi_video_device *device, 600 unsigned long long bqc_value) 601{ 602 unsigned long long level; 603 604 if (device->brightness->flags._BQC_use_index) { 605 /* 606 * _BQC returns an index that doesn't account for the first 2 607 * items with special meaning (see enum acpi_video_level_idx), 608 * so we need to compensate for that by offsetting ourselves 609 */ 610 if (device->brightness->flags._BCL_reversed) 611 bqc_value = device->brightness->count - 612 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 613 614 level = device->brightness->levels[bqc_value + 615 ACPI_VIDEO_FIRST_LEVEL]; 616 } else { 617 level = bqc_value; 618 } 619 620 level += bqc_offset_aml_bug_workaround; 621 622 return level; 623} 624 625static int 626acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 627 unsigned long long *level, bool raw) 628{ 629 acpi_status status = AE_OK; 630 int i; 631 632 if (device->cap._BQC || device->cap._BCQ) { 633 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 634 635 status = acpi_evaluate_integer(device->dev->handle, buf, 636 NULL, level); 637 if (ACPI_SUCCESS(status)) { 638 if (raw) { 639 /* 640 * Caller has indicated he wants the raw 641 * value returned by _BQC, so don't furtherly 642 * mess with the value. 643 */ 644 return 0; 645 } 646 647 *level = acpi_video_bqc_value_to_level(device, *level); 648 649 for (i = ACPI_VIDEO_FIRST_LEVEL; 650 i < device->brightness->count; i++) 651 if (device->brightness->levels[i] == *level) { 652 device->brightness->curr = *level; 653 return 0; 654 } 655 /* 656 * BQC returned an invalid level. 657 * Stop using it. 658 */ 659 ACPI_WARNING((AE_INFO, 660 "%s returned an invalid level", 661 buf)); 662 device->cap._BQC = device->cap._BCQ = 0; 663 } else { 664 /* 665 * Fixme: 666 * should we return an error or ignore this failure? 667 * dev->brightness->curr is a cached value which stores 668 * the correct current backlight level in most cases. 669 * ACPI video backlight still works w/ buggy _BQC. 670 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 671 */ 672 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf)); 673 device->cap._BQC = device->cap._BCQ = 0; 674 } 675 } 676 677 *level = device->brightness->curr; 678 return 0; 679} 680 681static int 682acpi_video_device_EDID(struct acpi_video_device *device, 683 union acpi_object **edid, ssize_t length) 684{ 685 int status; 686 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 687 union acpi_object *obj; 688 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 689 struct acpi_object_list args = { 1, &arg0 }; 690 691 692 *edid = NULL; 693 694 if (!device) 695 return -ENODEV; 696 if (length == 128) 697 arg0.integer.value = 1; 698 else if (length == 256) 699 arg0.integer.value = 2; 700 else 701 return -EINVAL; 702 703 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 704 if (ACPI_FAILURE(status)) 705 return -ENODEV; 706 707 obj = buffer.pointer; 708 709 if (obj && obj->type == ACPI_TYPE_BUFFER) 710 *edid = obj; 711 else { 712 printk(KERN_ERR PREFIX "Invalid _DDC data\n"); 713 status = -EFAULT; 714 kfree(obj); 715 } 716 717 return status; 718} 719 720/* bus */ 721 722/* 723 * Arg: 724 * video : video bus device pointer 725 * bios_flag : 726 * 0. The system BIOS should NOT automatically switch(toggle) 727 * the active display output. 728 * 1. The system BIOS should automatically switch (toggle) the 729 * active display output. No switch event. 730 * 2. The _DGS value should be locked. 731 * 3. The system BIOS should not automatically switch (toggle) the 732 * active display output, but instead generate the display switch 733 * event notify code. 734 * lcd_flag : 735 * 0. The system BIOS should automatically control the brightness level 736 * of the LCD when: 737 * - the power changes from AC to DC (ACPI appendix B) 738 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 739 * 1. The system BIOS should NOT automatically control the brightness 740 * level of the LCD when: 741 * - the power changes from AC to DC (ACPI appendix B) 742 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 743 * Return Value: 744 * -EINVAL wrong arg. 745 */ 746 747static int 748acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 749{ 750 acpi_status status; 751 752 if (!video->cap._DOS) 753 return 0; 754 755 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 756 return -EINVAL; 757 video->dos_setting = (lcd_flag << 2) | bios_flag; 758 status = acpi_execute_simple_method(video->device->handle, "_DOS", 759 (lcd_flag << 2) | bios_flag); 760 if (ACPI_FAILURE(status)) 761 return -EIO; 762 763 return 0; 764} 765 766/* 767 * Simple comparison function used to sort backlight levels. 768 */ 769 770static int 771acpi_video_cmp_level(const void *a, const void *b) 772{ 773 return *(int *)a - *(int *)b; 774} 775 776/* 777 * Decides if _BQC/_BCQ for this system is usable 778 * 779 * We do this by changing the level first and then read out the current 780 * brightness level, if the value does not match, find out if it is using 781 * index. If not, clear the _BQC/_BCQ capability. 782 */ 783static int acpi_video_bqc_quirk(struct acpi_video_device *device, 784 int max_level, int current_level) 785{ 786 struct acpi_video_device_brightness *br = device->brightness; 787 int result; 788 unsigned long long level; 789 int test_level; 790 791 /* don't mess with existing known broken systems */ 792 if (bqc_offset_aml_bug_workaround) 793 return 0; 794 795 /* 796 * Some systems always report current brightness level as maximum 797 * through _BQC, we need to test another value for them. However, 798 * there is a subtlety: 799 * 800 * If the _BCL package ordering is descending, the first level 801 * (br->levels[2]) is likely to be 0, and if the number of levels 802 * matches the number of steps, we might confuse a returned level to 803 * mean the index. 804 * 805 * For example: 806 * 807 * current_level = max_level = 100 808 * test_level = 0 809 * returned level = 100 810 * 811 * In this case 100 means the level, not the index, and _BCM failed. 812 * Still, if the _BCL package ordering is descending, the index of 813 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 814 * 815 * This causes all _BQC calls to return bogus values causing weird 816 * behavior from the user's perspective. For example: 817 * 818 * xbacklight -set 10; xbacklight -set 20; 819 * 820 * would flash to 90% and then slowly down to the desired level (20). 821 * 822 * The solution is simple; test anything other than the first level 823 * (e.g. 1). 824 */ 825 test_level = current_level == max_level 826 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 827 : max_level; 828 829 result = acpi_video_device_lcd_set_level(device, test_level); 830 if (result) 831 return result; 832 833 result = acpi_video_device_lcd_get_level_current(device, &level, true); 834 if (result) 835 return result; 836 837 if (level != test_level) { 838 /* buggy _BQC found, need to find out if it uses index */ 839 if (level < br->count) { 840 if (br->flags._BCL_reversed) 841 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 842 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 843 br->flags._BQC_use_index = 1; 844 } 845 846 if (!br->flags._BQC_use_index) 847 device->cap._BQC = device->cap._BCQ = 0; 848 } 849 850 return 0; 851} 852 853int acpi_video_get_levels(struct acpi_device *device, 854 struct acpi_video_device_brightness **dev_br, 855 int *pmax_level) 856{ 857 union acpi_object *obj = NULL; 858 int i, max_level = 0, count = 0, level_ac_battery = 0; 859 union acpi_object *o; 860 struct acpi_video_device_brightness *br = NULL; 861 int result = 0; 862 u32 value; 863 864 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle, 865 &obj))) { 866 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available " 867 "LCD brightness level\n")); 868 result = -ENODEV; 869 goto out; 870 } 871 872 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 873 result = -EINVAL; 874 goto out; 875 } 876 877 br = kzalloc(sizeof(*br), GFP_KERNEL); 878 if (!br) { 879 printk(KERN_ERR "can't allocate memory\n"); 880 result = -ENOMEM; 881 goto out; 882 } 883 884 /* 885 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 886 * in order to account for buggy BIOS which don't export the first two 887 * special levels (see below) 888 */ 889 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 890 sizeof(*br->levels), 891 GFP_KERNEL); 892 if (!br->levels) { 893 result = -ENOMEM; 894 goto out_free; 895 } 896 897 for (i = 0; i < obj->package.count; i++) { 898 o = (union acpi_object *)&obj->package.elements[i]; 899 if (o->type != ACPI_TYPE_INTEGER) { 900 printk(KERN_ERR PREFIX "Invalid data\n"); 901 continue; 902 } 903 value = (u32) o->integer.value; 904 /* Skip duplicate entries */ 905 if (count > ACPI_VIDEO_FIRST_LEVEL 906 && br->levels[count - 1] == value) 907 continue; 908 909 br->levels[count] = value; 910 911 if (br->levels[count] > max_level) 912 max_level = br->levels[count]; 913 count++; 914 } 915 916 /* 917 * some buggy BIOS don't export the levels 918 * when machine is on AC/Battery in _BCL package. 919 * In this case, the first two elements in _BCL packages 920 * are also supported brightness levels that OS should take care of. 921 */ 922 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 923 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 924 level_ac_battery++; 925 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 926 level_ac_battery++; 927 } 928 929 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 930 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 931 br->flags._BCL_no_ac_battery_levels = 1; 932 for (i = (count - 1 + level_ac_battery); 933 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 934 br->levels[i] = br->levels[i - level_ac_battery]; 935 count += level_ac_battery; 936 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 937 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package")); 938 939 /* Check if the _BCL package is in a reversed order */ 940 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 941 br->flags._BCL_reversed = 1; 942 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 943 count - ACPI_VIDEO_FIRST_LEVEL, 944 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 945 acpi_video_cmp_level, NULL); 946 } else if (max_level != br->levels[count - 1]) 947 ACPI_ERROR((AE_INFO, 948 "Found unordered _BCL package")); 949 950 br->count = count; 951 *dev_br = br; 952 if (pmax_level) 953 *pmax_level = max_level; 954 955out: 956 kfree(obj); 957 return result; 958out_free: 959 kfree(br); 960 goto out; 961} 962EXPORT_SYMBOL(acpi_video_get_levels); 963 964/* 965 * Arg: 966 * device : video output device (LCD, CRT, ..) 967 * 968 * Return Value: 969 * Maximum brightness level 970 * 971 * Allocate and initialize device->brightness. 972 */ 973 974static int 975acpi_video_init_brightness(struct acpi_video_device *device) 976{ 977 int i, max_level = 0; 978 unsigned long long level, level_old; 979 struct acpi_video_device_brightness *br = NULL; 980 int result; 981 982 result = acpi_video_get_levels(device->dev, &br, &max_level); 983 if (result) 984 return result; 985 device->brightness = br; 986 987 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 988 br->curr = level = max_level; 989 990 if (!device->cap._BQC) 991 goto set_level; 992 993 result = acpi_video_device_lcd_get_level_current(device, 994 &level_old, true); 995 if (result) 996 goto out_free_levels; 997 998 result = acpi_video_bqc_quirk(device, max_level, level_old); 999 if (result) 1000 goto out_free_levels; 1001 /* 1002 * cap._BQC may get cleared due to _BQC is found to be broken 1003 * in acpi_video_bqc_quirk, so check again here. 1004 */ 1005 if (!device->cap._BQC) 1006 goto set_level; 1007 1008 level = acpi_video_bqc_value_to_level(device, level_old); 1009 /* 1010 * On some buggy laptops, _BQC returns an uninitialized 1011 * value when invoked for the first time, i.e. 1012 * level_old is invalid (no matter whether it's a level 1013 * or an index). Set the backlight to max_level in this case. 1014 */ 1015 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 1016 if (level == br->levels[i]) 1017 break; 1018 if (i == br->count || !level) 1019 level = max_level; 1020 1021set_level: 1022 result = acpi_video_device_lcd_set_level(device, level); 1023 if (result) 1024 goto out_free_levels; 1025 1026 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1027 "found %d brightness levels\n", 1028 br->count - ACPI_VIDEO_FIRST_LEVEL)); 1029 return 0; 1030 1031out_free_levels: 1032 kfree(br->levels); 1033 kfree(br); 1034 device->brightness = NULL; 1035 return result; 1036} 1037 1038/* 1039 * Arg: 1040 * device : video output device (LCD, CRT, ..) 1041 * 1042 * Return Value: 1043 * None 1044 * 1045 * Find out all required AML methods defined under the output 1046 * device. 1047 */ 1048 1049static void acpi_video_device_find_cap(struct acpi_video_device *device) 1050{ 1051 if (acpi_has_method(device->dev->handle, "_ADR")) 1052 device->cap._ADR = 1; 1053 if (acpi_has_method(device->dev->handle, "_BCL")) 1054 device->cap._BCL = 1; 1055 if (acpi_has_method(device->dev->handle, "_BCM")) 1056 device->cap._BCM = 1; 1057 if (acpi_has_method(device->dev->handle, "_BQC")) { 1058 device->cap._BQC = 1; 1059 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 1060 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n"); 1061 device->cap._BCQ = 1; 1062 } 1063 1064 if (acpi_has_method(device->dev->handle, "_DDC")) 1065 device->cap._DDC = 1; 1066} 1067 1068/* 1069 * Arg: 1070 * device : video output device (VGA) 1071 * 1072 * Return Value: 1073 * None 1074 * 1075 * Find out all required AML methods defined under the video bus device. 1076 */ 1077 1078static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1079{ 1080 if (acpi_has_method(video->device->handle, "_DOS")) 1081 video->cap._DOS = 1; 1082 if (acpi_has_method(video->device->handle, "_DOD")) 1083 video->cap._DOD = 1; 1084 if (acpi_has_method(video->device->handle, "_ROM")) 1085 video->cap._ROM = 1; 1086 if (acpi_has_method(video->device->handle, "_GPD")) 1087 video->cap._GPD = 1; 1088 if (acpi_has_method(video->device->handle, "_SPD")) 1089 video->cap._SPD = 1; 1090 if (acpi_has_method(video->device->handle, "_VPO")) 1091 video->cap._VPO = 1; 1092} 1093 1094/* 1095 * Check whether the video bus device has required AML method to 1096 * support the desired features 1097 */ 1098 1099static int acpi_video_bus_check(struct acpi_video_bus *video) 1100{ 1101 acpi_status status = -ENOENT; 1102 struct pci_dev *dev; 1103 1104 if (!video) 1105 return -EINVAL; 1106 1107 dev = acpi_get_pci_dev(video->device->handle); 1108 if (!dev) 1109 return -ENODEV; 1110 pci_dev_put(dev); 1111 1112 /* 1113 * Since there is no HID, CID and so on for VGA driver, we have 1114 * to check well known required nodes. 1115 */ 1116 1117 /* Does this device support video switching? */ 1118 if (video->cap._DOS || video->cap._DOD) { 1119 if (!video->cap._DOS) { 1120 printk(KERN_WARNING FW_BUG 1121 "ACPI(%s) defines _DOD but not _DOS\n", 1122 acpi_device_bid(video->device)); 1123 } 1124 video->flags.multihead = 1; 1125 status = 0; 1126 } 1127 1128 /* Does this device support retrieving a video ROM? */ 1129 if (video->cap._ROM) { 1130 video->flags.rom = 1; 1131 status = 0; 1132 } 1133 1134 /* Does this device support configuring which video device to POST? */ 1135 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1136 video->flags.post = 1; 1137 status = 0; 1138 } 1139 1140 return status; 1141} 1142 1143/* 1144 * -------------------------------------------------------------------------- 1145 * Driver Interface 1146 * -------------------------------------------------------------------------- 1147 */ 1148 1149/* device interface */ 1150static struct acpi_video_device_attrib * 1151acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1152{ 1153 struct acpi_video_enumerated_device *ids; 1154 int i; 1155 1156 for (i = 0; i < video->attached_count; i++) { 1157 ids = &video->attached_array[i]; 1158 if ((ids->value.int_val & 0xffff) == device_id) 1159 return &ids->value.attrib; 1160 } 1161 1162 return NULL; 1163} 1164 1165static int 1166acpi_video_get_device_type(struct acpi_video_bus *video, 1167 unsigned long device_id) 1168{ 1169 struct acpi_video_enumerated_device *ids; 1170 int i; 1171 1172 for (i = 0; i < video->attached_count; i++) { 1173 ids = &video->attached_array[i]; 1174 if ((ids->value.int_val & 0xffff) == device_id) 1175 return ids->value.int_val; 1176 } 1177 1178 return 0; 1179} 1180 1181static int 1182acpi_video_bus_get_one_device(struct acpi_device *device, 1183 struct acpi_video_bus *video) 1184{ 1185 unsigned long long device_id; 1186 int status, device_type; 1187 struct acpi_video_device *data; 1188 struct acpi_video_device_attrib *attribute; 1189 1190 status = 1191 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1192 /* Some device omits _ADR, we skip them instead of fail */ 1193 if (ACPI_FAILURE(status)) 1194 return 0; 1195 1196 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1197 if (!data) 1198 return -ENOMEM; 1199 1200 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1201 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1202 device->driver_data = data; 1203 1204 data->device_id = device_id; 1205 data->video = video; 1206 data->dev = device; 1207 INIT_DELAYED_WORK(&data->switch_brightness_work, 1208 acpi_video_switch_brightness); 1209 1210 attribute = acpi_video_get_device_attr(video, device_id); 1211 1212 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1213 switch (attribute->display_type) { 1214 case ACPI_VIDEO_DISPLAY_CRT: 1215 data->flags.crt = 1; 1216 break; 1217 case ACPI_VIDEO_DISPLAY_TV: 1218 data->flags.tvout = 1; 1219 break; 1220 case ACPI_VIDEO_DISPLAY_DVI: 1221 data->flags.dvi = 1; 1222 break; 1223 case ACPI_VIDEO_DISPLAY_LCD: 1224 data->flags.lcd = 1; 1225 break; 1226 default: 1227 data->flags.unknown = 1; 1228 break; 1229 } 1230 if (attribute->bios_can_detect) 1231 data->flags.bios = 1; 1232 } else { 1233 /* Check for legacy IDs */ 1234 device_type = acpi_video_get_device_type(video, device_id); 1235 /* Ignore bits 16 and 18-20 */ 1236 switch (device_type & 0xffe2ffff) { 1237 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1238 data->flags.crt = 1; 1239 break; 1240 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1241 data->flags.lcd = 1; 1242 break; 1243 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1244 data->flags.tvout = 1; 1245 break; 1246 default: 1247 data->flags.unknown = 1; 1248 } 1249 } 1250 1251 acpi_video_device_bind(video, data); 1252 acpi_video_device_find_cap(data); 1253 1254 mutex_lock(&video->device_list_lock); 1255 list_add_tail(&data->entry, &video->video_device_list); 1256 mutex_unlock(&video->device_list_lock); 1257 1258 return status; 1259} 1260 1261/* 1262 * Arg: 1263 * video : video bus device 1264 * 1265 * Return: 1266 * none 1267 * 1268 * Enumerate the video device list of the video bus, 1269 * bind the ids with the corresponding video devices 1270 * under the video bus. 1271 */ 1272 1273static void acpi_video_device_rebind(struct acpi_video_bus *video) 1274{ 1275 struct acpi_video_device *dev; 1276 1277 mutex_lock(&video->device_list_lock); 1278 1279 list_for_each_entry(dev, &video->video_device_list, entry) 1280 acpi_video_device_bind(video, dev); 1281 1282 mutex_unlock(&video->device_list_lock); 1283} 1284 1285/* 1286 * Arg: 1287 * video : video bus device 1288 * device : video output device under the video 1289 * bus 1290 * 1291 * Return: 1292 * none 1293 * 1294 * Bind the ids with the corresponding video devices 1295 * under the video bus. 1296 */ 1297 1298static void 1299acpi_video_device_bind(struct acpi_video_bus *video, 1300 struct acpi_video_device *device) 1301{ 1302 struct acpi_video_enumerated_device *ids; 1303 int i; 1304 1305 for (i = 0; i < video->attached_count; i++) { 1306 ids = &video->attached_array[i]; 1307 if (device->device_id == (ids->value.int_val & 0xffff)) { 1308 ids->bind_info = device; 1309 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i)); 1310 } 1311 } 1312} 1313 1314static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1315{ 1316 struct acpi_video_bus *video = device->video; 1317 int i; 1318 1319 /* 1320 * If we have a broken _DOD or we have more than 8 output devices 1321 * under the graphics controller node that we can't proper deal with 1322 * in the operation region code currently, no need to test. 1323 */ 1324 if (!video->attached_count || video->child_count > 8) 1325 return true; 1326 1327 for (i = 0; i < video->attached_count; i++) { 1328 if ((video->attached_array[i].value.int_val & 0xfff) == 1329 (device->device_id & 0xfff)) 1330 return true; 1331 } 1332 1333 return false; 1334} 1335 1336/* 1337 * Arg: 1338 * video : video bus device 1339 * 1340 * Return: 1341 * < 0 : error 1342 * 1343 * Call _DOD to enumerate all devices attached to display adapter 1344 * 1345 */ 1346 1347static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1348{ 1349 int status; 1350 int count; 1351 int i; 1352 struct acpi_video_enumerated_device *active_list; 1353 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1354 union acpi_object *dod = NULL; 1355 union acpi_object *obj; 1356 1357 if (!video->cap._DOD) 1358 return AE_NOT_EXIST; 1359 1360 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1361 if (!ACPI_SUCCESS(status)) { 1362 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD")); 1363 return status; 1364 } 1365 1366 dod = buffer.pointer; 1367 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1368 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data")); 1369 status = -EFAULT; 1370 goto out; 1371 } 1372 1373 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n", 1374 dod->package.count)); 1375 1376 active_list = kcalloc(1 + dod->package.count, 1377 sizeof(struct acpi_video_enumerated_device), 1378 GFP_KERNEL); 1379 if (!active_list) { 1380 status = -ENOMEM; 1381 goto out; 1382 } 1383 1384 count = 0; 1385 for (i = 0; i < dod->package.count; i++) { 1386 obj = &dod->package.elements[i]; 1387 1388 if (obj->type != ACPI_TYPE_INTEGER) { 1389 printk(KERN_ERR PREFIX 1390 "Invalid _DOD data in element %d\n", i); 1391 continue; 1392 } 1393 1394 active_list[count].value.int_val = obj->integer.value; 1395 active_list[count].bind_info = NULL; 1396 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, 1397 (int)obj->integer.value)); 1398 count++; 1399 } 1400 1401 kfree(video->attached_array); 1402 1403 video->attached_array = active_list; 1404 video->attached_count = count; 1405 1406out: 1407 kfree(buffer.pointer); 1408 return status; 1409} 1410 1411static int 1412acpi_video_get_next_level(struct acpi_video_device *device, 1413 u32 level_current, u32 event) 1414{ 1415 int min, max, min_above, max_below, i, l, delta = 255; 1416 max = max_below = 0; 1417 min = min_above = 255; 1418 /* Find closest level to level_current */ 1419 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1420 l = device->brightness->levels[i]; 1421 if (abs(l - level_current) < abs(delta)) { 1422 delta = l - level_current; 1423 if (!delta) 1424 break; 1425 } 1426 } 1427 /* Ajust level_current to closest available level */ 1428 level_current += delta; 1429 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1430 l = device->brightness->levels[i]; 1431 if (l < min) 1432 min = l; 1433 if (l > max) 1434 max = l; 1435 if (l < min_above && l > level_current) 1436 min_above = l; 1437 if (l > max_below && l < level_current) 1438 max_below = l; 1439 } 1440 1441 switch (event) { 1442 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1443 return (level_current < max) ? min_above : min; 1444 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1445 return (level_current < max) ? min_above : max; 1446 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1447 return (level_current > min) ? max_below : min; 1448 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1449 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1450 return 0; 1451 default: 1452 return level_current; 1453 } 1454} 1455 1456static void 1457acpi_video_switch_brightness(struct work_struct *work) 1458{ 1459 struct acpi_video_device *device = container_of(to_delayed_work(work), 1460 struct acpi_video_device, switch_brightness_work); 1461 unsigned long long level_current, level_next; 1462 int event = device->switch_brightness_event; 1463 int result = -EINVAL; 1464 1465 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1466 if (!device->backlight) 1467 return; 1468 1469 if (!device->brightness) 1470 goto out; 1471 1472 result = acpi_video_device_lcd_get_level_current(device, 1473 &level_current, 1474 false); 1475 if (result) 1476 goto out; 1477 1478 level_next = acpi_video_get_next_level(device, level_current, event); 1479 1480 result = acpi_video_device_lcd_set_level(device, level_next); 1481 1482 if (!result) 1483 backlight_force_update(device->backlight, 1484 BACKLIGHT_UPDATE_HOTKEY); 1485 1486out: 1487 if (result) 1488 printk(KERN_ERR PREFIX "Failed to switch the brightness\n"); 1489} 1490 1491int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1492 void **edid) 1493{ 1494 struct acpi_video_bus *video; 1495 struct acpi_video_device *video_device; 1496 union acpi_object *buffer = NULL; 1497 acpi_status status; 1498 int i, length; 1499 1500 if (!device || !acpi_driver_data(device)) 1501 return -EINVAL; 1502 1503 video = acpi_driver_data(device); 1504 1505 for (i = 0; i < video->attached_count; i++) { 1506 video_device = video->attached_array[i].bind_info; 1507 length = 256; 1508 1509 if (!video_device) 1510 continue; 1511 1512 if (!video_device->cap._DDC) 1513 continue; 1514 1515 if (type) { 1516 switch (type) { 1517 case ACPI_VIDEO_DISPLAY_CRT: 1518 if (!video_device->flags.crt) 1519 continue; 1520 break; 1521 case ACPI_VIDEO_DISPLAY_TV: 1522 if (!video_device->flags.tvout) 1523 continue; 1524 break; 1525 case ACPI_VIDEO_DISPLAY_DVI: 1526 if (!video_device->flags.dvi) 1527 continue; 1528 break; 1529 case ACPI_VIDEO_DISPLAY_LCD: 1530 if (!video_device->flags.lcd) 1531 continue; 1532 break; 1533 } 1534 } else if (video_device->device_id != device_id) { 1535 continue; 1536 } 1537 1538 status = acpi_video_device_EDID(video_device, &buffer, length); 1539 1540 if (ACPI_FAILURE(status) || !buffer || 1541 buffer->type != ACPI_TYPE_BUFFER) { 1542 length = 128; 1543 status = acpi_video_device_EDID(video_device, &buffer, 1544 length); 1545 if (ACPI_FAILURE(status) || !buffer || 1546 buffer->type != ACPI_TYPE_BUFFER) { 1547 continue; 1548 } 1549 } 1550 1551 *edid = buffer->buffer.pointer; 1552 return length; 1553 } 1554 1555 return -ENODEV; 1556} 1557EXPORT_SYMBOL(acpi_video_get_edid); 1558 1559static int 1560acpi_video_bus_get_devices(struct acpi_video_bus *video, 1561 struct acpi_device *device) 1562{ 1563 int status = 0; 1564 struct acpi_device *dev; 1565 1566 /* 1567 * There are systems where video module known to work fine regardless 1568 * of broken _DOD and ignoring returned value here doesn't cause 1569 * any issues later. 1570 */ 1571 acpi_video_device_enumerate(video); 1572 1573 list_for_each_entry(dev, &device->children, node) { 1574 1575 status = acpi_video_bus_get_one_device(dev, video); 1576 if (status) { 1577 dev_err(&dev->dev, "Can't attach device\n"); 1578 break; 1579 } 1580 video->child_count++; 1581 } 1582 return status; 1583} 1584 1585/* acpi_video interface */ 1586 1587/* 1588 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1589 * preform any automatic brightness change on receiving a notification. 1590 */ 1591static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1592{ 1593 return acpi_video_bus_DOS(video, 0, 1594 acpi_osi_is_win8() ? 1 : 0); 1595} 1596 1597static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1598{ 1599 return acpi_video_bus_DOS(video, 0, 1600 acpi_osi_is_win8() ? 0 : 1); 1601} 1602 1603static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1604{ 1605 struct acpi_video_bus *video = acpi_driver_data(device); 1606 struct input_dev *input; 1607 int keycode = 0; 1608 1609 if (!video || !video->input) 1610 return; 1611 1612 input = video->input; 1613 1614 switch (event) { 1615 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1616 * most likely via hotkey. */ 1617 keycode = KEY_SWITCHVIDEOMODE; 1618 break; 1619 1620 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1621 * connector. */ 1622 acpi_video_device_enumerate(video); 1623 acpi_video_device_rebind(video); 1624 keycode = KEY_SWITCHVIDEOMODE; 1625 break; 1626 1627 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1628 keycode = KEY_SWITCHVIDEOMODE; 1629 break; 1630 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1631 keycode = KEY_VIDEO_NEXT; 1632 break; 1633 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1634 keycode = KEY_VIDEO_PREV; 1635 break; 1636 1637 default: 1638 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1639 "Unsupported event [0x%x]\n", event)); 1640 break; 1641 } 1642 1643 if (acpi_notifier_call_chain(device, event, 0)) 1644 /* Something vetoed the keypress. */ 1645 keycode = 0; 1646 1647 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1648 input_report_key(input, keycode, 1); 1649 input_sync(input); 1650 input_report_key(input, keycode, 0); 1651 input_sync(input); 1652 } 1653 1654 return; 1655} 1656 1657static void brightness_switch_event(struct acpi_video_device *video_device, 1658 u32 event) 1659{ 1660 if (!brightness_switch_enabled) 1661 return; 1662 1663 video_device->switch_brightness_event = event; 1664 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1665} 1666 1667static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1668{ 1669 struct acpi_video_device *video_device = data; 1670 struct acpi_device *device = NULL; 1671 struct acpi_video_bus *bus; 1672 struct input_dev *input; 1673 int keycode = 0; 1674 1675 if (!video_device) 1676 return; 1677 1678 device = video_device->dev; 1679 bus = video_device->video; 1680 input = bus->input; 1681 1682 if (hw_changes_brightness > 0) { 1683 if (video_device->backlight) 1684 backlight_force_update(video_device->backlight, 1685 BACKLIGHT_UPDATE_HOTKEY); 1686 acpi_notifier_call_chain(device, event, 0); 1687 return; 1688 } 1689 1690 switch (event) { 1691 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1692 brightness_switch_event(video_device, event); 1693 keycode = KEY_BRIGHTNESS_CYCLE; 1694 break; 1695 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1696 brightness_switch_event(video_device, event); 1697 keycode = KEY_BRIGHTNESSUP; 1698 break; 1699 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1700 brightness_switch_event(video_device, event); 1701 keycode = KEY_BRIGHTNESSDOWN; 1702 break; 1703 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1704 brightness_switch_event(video_device, event); 1705 keycode = KEY_BRIGHTNESS_ZERO; 1706 break; 1707 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1708 brightness_switch_event(video_device, event); 1709 keycode = KEY_DISPLAY_OFF; 1710 break; 1711 default: 1712 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1713 "Unsupported event [0x%x]\n", event)); 1714 break; 1715 } 1716 1717 acpi_notifier_call_chain(device, event, 0); 1718 1719 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1720 input_report_key(input, keycode, 1); 1721 input_sync(input); 1722 input_report_key(input, keycode, 0); 1723 input_sync(input); 1724 } 1725 1726 return; 1727} 1728 1729static int acpi_video_resume(struct notifier_block *nb, 1730 unsigned long val, void *ign) 1731{ 1732 struct acpi_video_bus *video; 1733 struct acpi_video_device *video_device; 1734 int i; 1735 1736 switch (val) { 1737 case PM_HIBERNATION_PREPARE: 1738 case PM_SUSPEND_PREPARE: 1739 case PM_RESTORE_PREPARE: 1740 return NOTIFY_DONE; 1741 } 1742 1743 video = container_of(nb, struct acpi_video_bus, pm_nb); 1744 1745 dev_info(&video->device->dev, "Restoring backlight state\n"); 1746 1747 for (i = 0; i < video->attached_count; i++) { 1748 video_device = video->attached_array[i].bind_info; 1749 if (video_device && video_device->brightness) 1750 acpi_video_device_lcd_set_level(video_device, 1751 video_device->brightness->curr); 1752 } 1753 1754 return NOTIFY_OK; 1755} 1756 1757static acpi_status 1758acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1759 void **return_value) 1760{ 1761 struct acpi_device *device = context; 1762 struct acpi_device *sibling; 1763 int result; 1764 1765 if (handle == device->handle) 1766 return AE_CTRL_TERMINATE; 1767 1768 result = acpi_bus_get_device(handle, &sibling); 1769 if (result) 1770 return AE_OK; 1771 1772 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1773 return AE_ALREADY_EXISTS; 1774 1775 return AE_OK; 1776} 1777 1778static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1779{ 1780 struct backlight_properties props; 1781 struct pci_dev *pdev; 1782 acpi_handle acpi_parent; 1783 struct device *parent = NULL; 1784 int result; 1785 static int count; 1786 char *name; 1787 1788 result = acpi_video_init_brightness(device); 1789 if (result) 1790 return; 1791 1792 if (disable_backlight_sysfs_if > 0) 1793 return; 1794 1795 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1796 if (!name) 1797 return; 1798 count++; 1799 1800 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) { 1801 pdev = acpi_get_pci_dev(acpi_parent); 1802 if (pdev) { 1803 parent = &pdev->dev; 1804 pci_dev_put(pdev); 1805 } 1806 } 1807 1808 memset(&props, 0, sizeof(struct backlight_properties)); 1809 props.type = BACKLIGHT_FIRMWARE; 1810 props.max_brightness = 1811 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1812 device->backlight = backlight_device_register(name, 1813 parent, 1814 device, 1815 &acpi_backlight_ops, 1816 &props); 1817 kfree(name); 1818 if (IS_ERR(device->backlight)) { 1819 device->backlight = NULL; 1820 return; 1821 } 1822 1823 /* 1824 * Save current brightness level in case we have to restore it 1825 * before acpi_video_device_lcd_set_level() is called next time. 1826 */ 1827 device->backlight->props.brightness = 1828 acpi_video_get_brightness(device->backlight); 1829 1830 device->cooling_dev = thermal_cooling_device_register("LCD", 1831 device->dev, &video_cooling_ops); 1832 if (IS_ERR(device->cooling_dev)) { 1833 /* 1834 * Set cooling_dev to NULL so we don't crash trying to free it. 1835 * Also, why the hell we are returning early and not attempt to 1836 * register video output if cooling device registration failed? 1837 * -- dtor 1838 */ 1839 device->cooling_dev = NULL; 1840 return; 1841 } 1842 1843 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1844 device->cooling_dev->id); 1845 result = sysfs_create_link(&device->dev->dev.kobj, 1846 &device->cooling_dev->device.kobj, 1847 "thermal_cooling"); 1848 if (result) 1849 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1850 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1851 &device->dev->dev.kobj, "device"); 1852 if (result) 1853 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1854} 1855 1856static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1857{ 1858 struct acpi_video_device *dev; 1859 union acpi_object *levels; 1860 1861 mutex_lock(&video->device_list_lock); 1862 list_for_each_entry(dev, &video->video_device_list, entry) { 1863 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1864 kfree(levels); 1865 } 1866 mutex_unlock(&video->device_list_lock); 1867} 1868 1869static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1870{ 1871 /* 1872 * Do not create backlight device for video output 1873 * device that is not in the enumerated list. 1874 */ 1875 if (!acpi_video_device_in_dod(dev)) { 1876 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1877 return false; 1878 } 1879 1880 if (only_lcd) 1881 return dev->flags.lcd; 1882 return true; 1883} 1884 1885static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1886{ 1887 struct acpi_video_device *dev; 1888 1889 if (video->backlight_registered) 1890 return 0; 1891 1892 acpi_video_run_bcl_for_osi(video); 1893 1894 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1895 return 0; 1896 1897 mutex_lock(&video->device_list_lock); 1898 list_for_each_entry(dev, &video->video_device_list, entry) { 1899 if (acpi_video_should_register_backlight(dev)) 1900 acpi_video_dev_register_backlight(dev); 1901 } 1902 mutex_unlock(&video->device_list_lock); 1903 1904 video->backlight_registered = true; 1905 1906 video->pm_nb.notifier_call = acpi_video_resume; 1907 video->pm_nb.priority = 0; 1908 return register_pm_notifier(&video->pm_nb); 1909} 1910 1911static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1912{ 1913 if (device->backlight) { 1914 backlight_device_unregister(device->backlight); 1915 device->backlight = NULL; 1916 } 1917 if (device->brightness) { 1918 kfree(device->brightness->levels); 1919 kfree(device->brightness); 1920 device->brightness = NULL; 1921 } 1922 if (device->cooling_dev) { 1923 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1924 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1925 thermal_cooling_device_unregister(device->cooling_dev); 1926 device->cooling_dev = NULL; 1927 } 1928} 1929 1930static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1931{ 1932 struct acpi_video_device *dev; 1933 int error; 1934 1935 if (!video->backlight_registered) 1936 return 0; 1937 1938 error = unregister_pm_notifier(&video->pm_nb); 1939 1940 mutex_lock(&video->device_list_lock); 1941 list_for_each_entry(dev, &video->video_device_list, entry) 1942 acpi_video_dev_unregister_backlight(dev); 1943 mutex_unlock(&video->device_list_lock); 1944 1945 video->backlight_registered = false; 1946 1947 return error; 1948} 1949 1950static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1951{ 1952 acpi_status status; 1953 struct acpi_device *adev = device->dev; 1954 1955 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1956 acpi_video_device_notify, device); 1957 if (ACPI_FAILURE(status)) 1958 dev_err(&adev->dev, "Error installing notify handler\n"); 1959 else 1960 device->flags.notify = 1; 1961} 1962 1963static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1964{ 1965 struct input_dev *input; 1966 struct acpi_video_device *dev; 1967 int error; 1968 1969 video->input = input = input_allocate_device(); 1970 if (!input) { 1971 error = -ENOMEM; 1972 goto out; 1973 } 1974 1975 error = acpi_video_bus_start_devices(video); 1976 if (error) 1977 goto err_free_input; 1978 1979 snprintf(video->phys, sizeof(video->phys), 1980 "%s/video/input0", acpi_device_hid(video->device)); 1981 1982 input->name = acpi_device_name(video->device); 1983 input->phys = video->phys; 1984 input->id.bustype = BUS_HOST; 1985 input->id.product = 0x06; 1986 input->dev.parent = &video->device->dev; 1987 input->evbit[0] = BIT(EV_KEY); 1988 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1989 set_bit(KEY_VIDEO_NEXT, input->keybit); 1990 set_bit(KEY_VIDEO_PREV, input->keybit); 1991 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1992 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1993 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1994 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1995 set_bit(KEY_DISPLAY_OFF, input->keybit); 1996 1997 error = input_register_device(input); 1998 if (error) 1999 goto err_stop_dev; 2000 2001 mutex_lock(&video->device_list_lock); 2002 list_for_each_entry(dev, &video->video_device_list, entry) 2003 acpi_video_dev_add_notify_handler(dev); 2004 mutex_unlock(&video->device_list_lock); 2005 2006 return 0; 2007 2008err_stop_dev: 2009 acpi_video_bus_stop_devices(video); 2010err_free_input: 2011 input_free_device(input); 2012 video->input = NULL; 2013out: 2014 return error; 2015} 2016 2017static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 2018{ 2019 if (dev->flags.notify) { 2020 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 2021 acpi_video_device_notify); 2022 dev->flags.notify = 0; 2023 } 2024} 2025 2026static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 2027{ 2028 struct acpi_video_device *dev; 2029 2030 mutex_lock(&video->device_list_lock); 2031 list_for_each_entry(dev, &video->video_device_list, entry) 2032 acpi_video_dev_remove_notify_handler(dev); 2033 mutex_unlock(&video->device_list_lock); 2034 2035 acpi_video_bus_stop_devices(video); 2036 input_unregister_device(video->input); 2037 video->input = NULL; 2038} 2039 2040static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 2041{ 2042 struct acpi_video_device *dev, *next; 2043 2044 mutex_lock(&video->device_list_lock); 2045 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 2046 list_del(&dev->entry); 2047 kfree(dev); 2048 } 2049 mutex_unlock(&video->device_list_lock); 2050 2051 return 0; 2052} 2053 2054static int instance; 2055 2056static int acpi_video_bus_add(struct acpi_device *device) 2057{ 2058 struct acpi_video_bus *video; 2059 int error; 2060 acpi_status status; 2061 2062 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 2063 device->parent->handle, 1, 2064 acpi_video_bus_match, NULL, 2065 device, NULL); 2066 if (status == AE_ALREADY_EXISTS) { 2067 printk(KERN_WARNING FW_BUG 2068 "Duplicate ACPI video bus devices for the" 2069 " same VGA controller, please try module " 2070 "parameter \"video.allow_duplicates=1\"" 2071 "if the current driver doesn't work.\n"); 2072 if (!allow_duplicates) 2073 return -ENODEV; 2074 } 2075 2076 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2077 if (!video) 2078 return -ENOMEM; 2079 2080 /* a hack to fix the duplicate name "VID" problem on T61 */ 2081 if (!strcmp(device->pnp.bus_id, "VID")) { 2082 if (instance) 2083 device->pnp.bus_id[3] = '0' + instance; 2084 instance++; 2085 } 2086 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2087 if (!strcmp(device->pnp.bus_id, "VGA")) { 2088 if (instance) 2089 device->pnp.bus_id[3] = '0' + instance; 2090 instance++; 2091 } 2092 2093 video->device = device; 2094 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2095 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2096 device->driver_data = video; 2097 2098 acpi_video_bus_find_cap(video); 2099 error = acpi_video_bus_check(video); 2100 if (error) 2101 goto err_free_video; 2102 2103 mutex_init(&video->device_list_lock); 2104 INIT_LIST_HEAD(&video->video_device_list); 2105 2106 error = acpi_video_bus_get_devices(video, device); 2107 if (error) 2108 goto err_put_video; 2109 2110 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n", 2111 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2112 video->flags.multihead ? "yes" : "no", 2113 video->flags.rom ? "yes" : "no", 2114 video->flags.post ? "yes" : "no"); 2115 mutex_lock(&video_list_lock); 2116 list_add_tail(&video->entry, &video_bus_head); 2117 mutex_unlock(&video_list_lock); 2118 2119 acpi_video_bus_register_backlight(video); 2120 acpi_video_bus_add_notify_handler(video); 2121 2122 return 0; 2123 2124err_put_video: 2125 acpi_video_bus_put_devices(video); 2126 kfree(video->attached_array); 2127err_free_video: 2128 kfree(video); 2129 device->driver_data = NULL; 2130 2131 return error; 2132} 2133 2134static int acpi_video_bus_remove(struct acpi_device *device) 2135{ 2136 struct acpi_video_bus *video = NULL; 2137 2138 2139 if (!device || !acpi_driver_data(device)) 2140 return -EINVAL; 2141 2142 video = acpi_driver_data(device); 2143 2144 acpi_video_bus_remove_notify_handler(video); 2145 acpi_video_bus_unregister_backlight(video); 2146 acpi_video_bus_put_devices(video); 2147 2148 mutex_lock(&video_list_lock); 2149 list_del(&video->entry); 2150 mutex_unlock(&video_list_lock); 2151 2152 kfree(video->attached_array); 2153 kfree(video); 2154 2155 return 0; 2156} 2157 2158static int __init is_i740(struct pci_dev *dev) 2159{ 2160 if (dev->device == 0x00D1) 2161 return 1; 2162 if (dev->device == 0x7000) 2163 return 1; 2164 return 0; 2165} 2166 2167static int __init intel_opregion_present(void) 2168{ 2169 int opregion = 0; 2170 struct pci_dev *dev = NULL; 2171 u32 address; 2172 2173 for_each_pci_dev(dev) { 2174 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2175 continue; 2176 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2177 continue; 2178 /* We don't want to poke around undefined i740 registers */ 2179 if (is_i740(dev)) 2180 continue; 2181 pci_read_config_dword(dev, 0xfc, &address); 2182 if (!address) 2183 continue; 2184 opregion = 1; 2185 } 2186 return opregion; 2187} 2188 2189/* Check if the chassis-type indicates there is no builtin LCD panel */ 2190static bool dmi_is_desktop(void) 2191{ 2192 const char *chassis_type; 2193 unsigned long type; 2194 2195 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2196 if (!chassis_type) 2197 return false; 2198 2199 if (kstrtoul(chassis_type, 10, &type) != 0) 2200 return false; 2201 2202 switch (type) { 2203 case 0x03: /* Desktop */ 2204 case 0x04: /* Low Profile Desktop */ 2205 case 0x05: /* Pizza Box */ 2206 case 0x06: /* Mini Tower */ 2207 case 0x07: /* Tower */ 2208 case 0x10: /* Lunch Box */ 2209 case 0x11: /* Main Server Chassis */ 2210 return true; 2211 } 2212 2213 return false; 2214} 2215 2216int acpi_video_register(void) 2217{ 2218 int ret = 0; 2219 2220 mutex_lock(®ister_count_mutex); 2221 if (register_count) { 2222 /* 2223 * if the function of acpi_video_register is already called, 2224 * don't register the acpi_video_bus again and return no error. 2225 */ 2226 goto leave; 2227 } 2228 2229 /* 2230 * We're seeing a lot of bogus backlight interfaces on newer machines 2231 * without a LCD such as desktops, servers and HDMI sticks. Checking 2232 * the lcd flag fixes this, so enable this on any machines which are 2233 * win8 ready (where we also prefer the native backlight driver, so 2234 * normally the acpi_video code should not register there anyways). 2235 */ 2236 if (only_lcd == -1) { 2237 if (dmi_is_desktop() && acpi_osi_is_win8()) 2238 only_lcd = true; 2239 else 2240 only_lcd = false; 2241 } 2242 2243 dmi_check_system(video_dmi_table); 2244 2245 ret = acpi_bus_register_driver(&acpi_video_bus); 2246 if (ret) 2247 goto leave; 2248 2249 /* 2250 * When the acpi_video_bus is loaded successfully, increase 2251 * the counter reference. 2252 */ 2253 register_count = 1; 2254 2255leave: 2256 mutex_unlock(®ister_count_mutex); 2257 return ret; 2258} 2259EXPORT_SYMBOL(acpi_video_register); 2260 2261void acpi_video_unregister(void) 2262{ 2263 mutex_lock(®ister_count_mutex); 2264 if (register_count) { 2265 acpi_bus_unregister_driver(&acpi_video_bus); 2266 register_count = 0; 2267 } 2268 mutex_unlock(®ister_count_mutex); 2269} 2270EXPORT_SYMBOL(acpi_video_unregister); 2271 2272void acpi_video_unregister_backlight(void) 2273{ 2274 struct acpi_video_bus *video; 2275 2276 mutex_lock(®ister_count_mutex); 2277 if (register_count) { 2278 mutex_lock(&video_list_lock); 2279 list_for_each_entry(video, &video_bus_head, entry) 2280 acpi_video_bus_unregister_backlight(video); 2281 mutex_unlock(&video_list_lock); 2282 } 2283 mutex_unlock(®ister_count_mutex); 2284} 2285 2286bool acpi_video_handles_brightness_key_presses(void) 2287{ 2288 bool have_video_busses; 2289 2290 mutex_lock(&video_list_lock); 2291 have_video_busses = !list_empty(&video_bus_head); 2292 mutex_unlock(&video_list_lock); 2293 2294 return have_video_busses && 2295 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2296} 2297EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2298 2299/* 2300 * This is kind of nasty. Hardware using Intel chipsets may require 2301 * the video opregion code to be run first in order to initialise 2302 * state before any ACPI video calls are made. To handle this we defer 2303 * registration of the video class until the opregion code has run. 2304 */ 2305 2306static int __init acpi_video_init(void) 2307{ 2308 /* 2309 * Let the module load even if ACPI is disabled (e.g. due to 2310 * a broken BIOS) so that i915.ko can still be loaded on such 2311 * old systems without an AcpiOpRegion. 2312 * 2313 * acpi_video_register() will report -ENODEV later as well due 2314 * to acpi_disabled when i915.ko tries to register itself afterwards. 2315 */ 2316 if (acpi_disabled) 2317 return 0; 2318 2319 if (intel_opregion_present()) 2320 return 0; 2321 2322 return acpi_video_register(); 2323} 2324 2325static void __exit acpi_video_exit(void) 2326{ 2327 acpi_video_detect_exit(); 2328 acpi_video_unregister(); 2329 2330 return; 2331} 2332 2333module_init(acpi_video_init); 2334module_exit(acpi_video_exit); 2335