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 36 MODULE_AUTHOR("Bruno Ducrot"); 37 MODULE_DESCRIPTION("ACPI Video Driver"); 38 MODULE_LICENSE("GPL"); 39 40 static bool brightness_switch_enabled = true; 41 module_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 */ 47 static bool allow_duplicates; 48 module_param(allow_duplicates, bool, 0644); 49 50 #define REPORT_OUTPUT_KEY_EVENTS 0x01 51 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 52 static int report_key_events = -1; 53 module_param(report_key_events, int, 0644); 54 MODULE_PARM_DESC(report_key_events, 55 "0: none, 1: output changes, 2: brightness changes, 3: all"); 56 57 static int hw_changes_brightness = -1; 58 module_param(hw_changes_brightness, int, 0644); 59 MODULE_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 */ 67 static bool device_id_scheme = false; 68 module_param(device_id_scheme, bool, 0444); 69 70 static int only_lcd = -1; 71 module_param(only_lcd, int, 0444); 72 73 static bool may_report_brightness_keys; 74 static int register_count; 75 static DEFINE_MUTEX(register_count_mutex); 76 static DEFINE_MUTEX(video_list_lock); 77 static LIST_HEAD(video_bus_head); 78 static int acpi_video_bus_add(struct acpi_device *device); 79 static void acpi_video_bus_remove(struct acpi_device *device); 80 static 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 */ 88 enum 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 94 static const struct acpi_device_id video_device_ids[] = { 95 {ACPI_VIDEO_HID, 0}, 96 {"", 0}, 97 }; 98 MODULE_DEVICE_TABLE(acpi, video_device_ids); 99 100 static struct acpi_driver acpi_video_bus = { 101 .name = "video", 102 .class = ACPI_VIDEO_CLASS, 103 .ids = video_device_ids, 104 .ops = { 105 .add = acpi_video_bus_add, 106 .remove = acpi_video_bus_remove, 107 }, 108 }; 109 110 struct 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 }; 116 117 struct 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 }; 126 127 struct 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 }; 147 148 struct 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 }; 155 156 struct 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 }; 172 173 struct 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 }; 183 184 struct 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 }; 192 193 struct 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 }; 206 207 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 208 static void acpi_video_device_rebind(struct acpi_video_bus *video); 209 static void acpi_video_device_bind(struct acpi_video_bus *video, 210 struct acpi_video_device *device); 211 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 212 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 213 int level); 214 static int acpi_video_device_lcd_get_level_current( 215 struct acpi_video_device *device, 216 unsigned long long *level, bool raw); 217 static int acpi_video_get_next_level(struct acpi_video_device *device, 218 u32 level_current, u32 event); 219 static void acpi_video_switch_brightness(struct work_struct *work); 220 221 /* backlight device sysfs support */ 222 static 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 } 236 237 static 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 } 246 247 static 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 */ 253 static 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 } 261 262 static 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 } 280 281 static int 282 video_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 } 294 295 static 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 */ 306 307 static int 308 acpi_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; 331 332 err: 333 kfree(buffer.pointer); 334 335 return status; 336 } 337 338 static int 339 acpi_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 */ 369 370 static int bqc_offset_aml_bug_workaround; 371 static int video_set_bqc_offset(const struct dmi_system_id *d) 372 { 373 bqc_offset_aml_bug_workaround = 9; 374 return 0; 375 } 376 377 static int video_set_device_id_scheme(const struct dmi_system_id *d) 378 { 379 device_id_scheme = true; 380 return 0; 381 } 382 383 static int video_enable_only_lcd(const struct dmi_system_id *d) 384 { 385 only_lcd = true; 386 return 0; 387 } 388 389 static 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 } 395 396 static 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 } 403 404 static 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 * Some machines change the brightness themselves when a brightness 505 * hotkey gets pressed, despite us telling them not to. In this case 506 * acpi_video_device_notify() should only call backlight_force_update( 507 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 508 */ 509 { 510 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 511 .callback = video_hw_changes_brightness, 512 .ident = "Packard Bell EasyNote MZ35", 513 .matches = { 514 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 515 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 516 }, 517 }, 518 {} 519 }; 520 521 static unsigned long long 522 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 523 unsigned long long bqc_value) 524 { 525 unsigned long long level; 526 527 if (device->brightness->flags._BQC_use_index) { 528 /* 529 * _BQC returns an index that doesn't account for the first 2 530 * items with special meaning (see enum acpi_video_level_idx), 531 * so we need to compensate for that by offsetting ourselves 532 */ 533 if (device->brightness->flags._BCL_reversed) 534 bqc_value = device->brightness->count - 535 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 536 537 level = device->brightness->levels[bqc_value + 538 ACPI_VIDEO_FIRST_LEVEL]; 539 } else { 540 level = bqc_value; 541 } 542 543 level += bqc_offset_aml_bug_workaround; 544 545 return level; 546 } 547 548 static int 549 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 550 unsigned long long *level, bool raw) 551 { 552 acpi_status status = AE_OK; 553 int i; 554 555 if (device->cap._BQC || device->cap._BCQ) { 556 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 557 558 status = acpi_evaluate_integer(device->dev->handle, buf, 559 NULL, level); 560 if (ACPI_SUCCESS(status)) { 561 if (raw) { 562 /* 563 * Caller has indicated he wants the raw 564 * value returned by _BQC, so don't furtherly 565 * mess with the value. 566 */ 567 return 0; 568 } 569 570 *level = acpi_video_bqc_value_to_level(device, *level); 571 572 for (i = ACPI_VIDEO_FIRST_LEVEL; 573 i < device->brightness->count; i++) 574 if (device->brightness->levels[i] == *level) { 575 device->brightness->curr = *level; 576 return 0; 577 } 578 /* 579 * BQC returned an invalid level. 580 * Stop using it. 581 */ 582 acpi_handle_info(device->dev->handle, 583 "%s returned an invalid level", buf); 584 device->cap._BQC = device->cap._BCQ = 0; 585 } else { 586 /* 587 * Fixme: 588 * should we return an error or ignore this failure? 589 * dev->brightness->curr is a cached value which stores 590 * the correct current backlight level in most cases. 591 * ACPI video backlight still works w/ buggy _BQC. 592 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 593 */ 594 acpi_handle_info(device->dev->handle, 595 "%s evaluation failed", buf); 596 device->cap._BQC = device->cap._BCQ = 0; 597 } 598 } 599 600 *level = device->brightness->curr; 601 return 0; 602 } 603 604 static int 605 acpi_video_device_EDID(struct acpi_video_device *device, 606 union acpi_object **edid, ssize_t length) 607 { 608 int status; 609 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 610 union acpi_object *obj; 611 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 612 struct acpi_object_list args = { 1, &arg0 }; 613 614 615 *edid = NULL; 616 617 if (!device) 618 return -ENODEV; 619 if (length == 128) 620 arg0.integer.value = 1; 621 else if (length == 256) 622 arg0.integer.value = 2; 623 else 624 return -EINVAL; 625 626 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 627 if (ACPI_FAILURE(status)) 628 return -ENODEV; 629 630 obj = buffer.pointer; 631 632 if (obj && obj->type == ACPI_TYPE_BUFFER) 633 *edid = obj; 634 else { 635 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); 636 status = -EFAULT; 637 kfree(obj); 638 } 639 640 return status; 641 } 642 643 /* bus */ 644 645 /* 646 * Arg: 647 * video : video bus device pointer 648 * bios_flag : 649 * 0. The system BIOS should NOT automatically switch(toggle) 650 * the active display output. 651 * 1. The system BIOS should automatically switch (toggle) the 652 * active display output. No switch event. 653 * 2. The _DGS value should be locked. 654 * 3. The system BIOS should not automatically switch (toggle) the 655 * active display output, but instead generate the display switch 656 * event notify code. 657 * lcd_flag : 658 * 0. The system BIOS should automatically control the brightness level 659 * of the LCD when: 660 * - the power changes from AC to DC (ACPI appendix B) 661 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 662 * 1. The system BIOS should NOT automatically control the brightness 663 * level of the LCD when: 664 * - the power changes from AC to DC (ACPI appendix B) 665 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 666 * Return Value: 667 * -EINVAL wrong arg. 668 */ 669 670 static int 671 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 672 { 673 acpi_status status; 674 675 if (!video->cap._DOS) 676 return 0; 677 678 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 679 return -EINVAL; 680 video->dos_setting = (lcd_flag << 2) | bios_flag; 681 status = acpi_execute_simple_method(video->device->handle, "_DOS", 682 (lcd_flag << 2) | bios_flag); 683 if (ACPI_FAILURE(status)) 684 return -EIO; 685 686 return 0; 687 } 688 689 /* 690 * Simple comparison function used to sort backlight levels. 691 */ 692 693 static int 694 acpi_video_cmp_level(const void *a, const void *b) 695 { 696 return *(int *)a - *(int *)b; 697 } 698 699 /* 700 * Decides if _BQC/_BCQ for this system is usable 701 * 702 * We do this by changing the level first and then read out the current 703 * brightness level, if the value does not match, find out if it is using 704 * index. If not, clear the _BQC/_BCQ capability. 705 */ 706 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 707 int max_level, int current_level) 708 { 709 struct acpi_video_device_brightness *br = device->brightness; 710 int result; 711 unsigned long long level; 712 int test_level; 713 714 /* don't mess with existing known broken systems */ 715 if (bqc_offset_aml_bug_workaround) 716 return 0; 717 718 /* 719 * Some systems always report current brightness level as maximum 720 * through _BQC, we need to test another value for them. However, 721 * there is a subtlety: 722 * 723 * If the _BCL package ordering is descending, the first level 724 * (br->levels[2]) is likely to be 0, and if the number of levels 725 * matches the number of steps, we might confuse a returned level to 726 * mean the index. 727 * 728 * For example: 729 * 730 * current_level = max_level = 100 731 * test_level = 0 732 * returned level = 100 733 * 734 * In this case 100 means the level, not the index, and _BCM failed. 735 * Still, if the _BCL package ordering is descending, the index of 736 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 737 * 738 * This causes all _BQC calls to return bogus values causing weird 739 * behavior from the user's perspective. For example: 740 * 741 * xbacklight -set 10; xbacklight -set 20; 742 * 743 * would flash to 90% and then slowly down to the desired level (20). 744 * 745 * The solution is simple; test anything other than the first level 746 * (e.g. 1). 747 */ 748 test_level = current_level == max_level 749 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 750 : max_level; 751 752 result = acpi_video_device_lcd_set_level(device, test_level); 753 if (result) 754 return result; 755 756 result = acpi_video_device_lcd_get_level_current(device, &level, true); 757 if (result) 758 return result; 759 760 if (level != test_level) { 761 /* buggy _BQC found, need to find out if it uses index */ 762 if (level < br->count) { 763 if (br->flags._BCL_reversed) 764 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 765 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 766 br->flags._BQC_use_index = 1; 767 } 768 769 if (!br->flags._BQC_use_index) 770 device->cap._BQC = device->cap._BCQ = 0; 771 } 772 773 return 0; 774 } 775 776 int acpi_video_get_levels(struct acpi_device *device, 777 struct acpi_video_device_brightness **dev_br, 778 int *pmax_level) 779 { 780 union acpi_object *obj = NULL; 781 int i, max_level = 0, count = 0, level_ac_battery = 0; 782 union acpi_object *o; 783 struct acpi_video_device_brightness *br = NULL; 784 int result = 0; 785 u32 value; 786 787 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 788 acpi_handle_debug(device->handle, 789 "Could not query available LCD brightness level\n"); 790 result = -ENODEV; 791 goto out; 792 } 793 794 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 795 result = -EINVAL; 796 goto out; 797 } 798 799 br = kzalloc(sizeof(*br), GFP_KERNEL); 800 if (!br) { 801 result = -ENOMEM; 802 goto out; 803 } 804 805 /* 806 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 807 * in order to account for buggy BIOS which don't export the first two 808 * special levels (see below) 809 */ 810 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 811 sizeof(*br->levels), 812 GFP_KERNEL); 813 if (!br->levels) { 814 result = -ENOMEM; 815 goto out_free; 816 } 817 818 for (i = 0; i < obj->package.count; i++) { 819 o = (union acpi_object *)&obj->package.elements[i]; 820 if (o->type != ACPI_TYPE_INTEGER) { 821 acpi_handle_info(device->handle, "Invalid data\n"); 822 continue; 823 } 824 value = (u32) o->integer.value; 825 /* Skip duplicate entries */ 826 if (count > ACPI_VIDEO_FIRST_LEVEL 827 && br->levels[count - 1] == value) 828 continue; 829 830 br->levels[count] = value; 831 832 if (br->levels[count] > max_level) 833 max_level = br->levels[count]; 834 count++; 835 } 836 837 /* 838 * some buggy BIOS don't export the levels 839 * when machine is on AC/Battery in _BCL package. 840 * In this case, the first two elements in _BCL packages 841 * are also supported brightness levels that OS should take care of. 842 */ 843 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 844 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 845 level_ac_battery++; 846 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 847 level_ac_battery++; 848 } 849 850 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 851 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 852 br->flags._BCL_no_ac_battery_levels = 1; 853 for (i = (count - 1 + level_ac_battery); 854 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 855 br->levels[i] = br->levels[i - level_ac_battery]; 856 count += level_ac_battery; 857 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 858 acpi_handle_info(device->handle, 859 "Too many duplicates in _BCL package"); 860 861 /* Check if the _BCL package is in a reversed order */ 862 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 863 br->flags._BCL_reversed = 1; 864 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 865 count - ACPI_VIDEO_FIRST_LEVEL, 866 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 867 acpi_video_cmp_level, NULL); 868 } else if (max_level != br->levels[count - 1]) 869 acpi_handle_info(device->handle, 870 "Found unordered _BCL package"); 871 872 br->count = count; 873 *dev_br = br; 874 if (pmax_level) 875 *pmax_level = max_level; 876 877 out: 878 kfree(obj); 879 return result; 880 out_free: 881 kfree(br); 882 goto out; 883 } 884 EXPORT_SYMBOL(acpi_video_get_levels); 885 886 /* 887 * Arg: 888 * device : video output device (LCD, CRT, ..) 889 * 890 * Return Value: 891 * Maximum brightness level 892 * 893 * Allocate and initialize device->brightness. 894 */ 895 896 static int 897 acpi_video_init_brightness(struct acpi_video_device *device) 898 { 899 int i, max_level = 0; 900 unsigned long long level, level_old; 901 struct acpi_video_device_brightness *br = NULL; 902 int result; 903 904 result = acpi_video_get_levels(device->dev, &br, &max_level); 905 if (result) 906 return result; 907 device->brightness = br; 908 909 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 910 br->curr = level = max_level; 911 912 if (!device->cap._BQC) 913 goto set_level; 914 915 result = acpi_video_device_lcd_get_level_current(device, 916 &level_old, true); 917 if (result) 918 goto out_free_levels; 919 920 result = acpi_video_bqc_quirk(device, max_level, level_old); 921 if (result) 922 goto out_free_levels; 923 /* 924 * cap._BQC may get cleared due to _BQC is found to be broken 925 * in acpi_video_bqc_quirk, so check again here. 926 */ 927 if (!device->cap._BQC) 928 goto set_level; 929 930 level = acpi_video_bqc_value_to_level(device, level_old); 931 /* 932 * On some buggy laptops, _BQC returns an uninitialized 933 * value when invoked for the first time, i.e. 934 * level_old is invalid (no matter whether it's a level 935 * or an index). Set the backlight to max_level in this case. 936 */ 937 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 938 if (level == br->levels[i]) 939 break; 940 if (i == br->count || !level) 941 level = max_level; 942 943 set_level: 944 result = acpi_video_device_lcd_set_level(device, level); 945 if (result) 946 goto out_free_levels; 947 948 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 949 br->count - ACPI_VIDEO_FIRST_LEVEL); 950 951 return 0; 952 953 out_free_levels: 954 kfree(br->levels); 955 kfree(br); 956 device->brightness = NULL; 957 return result; 958 } 959 960 /* 961 * Arg: 962 * device : video output device (LCD, CRT, ..) 963 * 964 * Return Value: 965 * None 966 * 967 * Find out all required AML methods defined under the output 968 * device. 969 */ 970 971 static void acpi_video_device_find_cap(struct acpi_video_device *device) 972 { 973 if (acpi_has_method(device->dev->handle, "_ADR")) 974 device->cap._ADR = 1; 975 if (acpi_has_method(device->dev->handle, "_BCL")) 976 device->cap._BCL = 1; 977 if (acpi_has_method(device->dev->handle, "_BCM")) 978 device->cap._BCM = 1; 979 if (acpi_has_method(device->dev->handle, "_BQC")) { 980 device->cap._BQC = 1; 981 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 982 acpi_handle_info(device->dev->handle, 983 "_BCQ is used instead of _BQC\n"); 984 device->cap._BCQ = 1; 985 } 986 987 if (acpi_has_method(device->dev->handle, "_DDC")) 988 device->cap._DDC = 1; 989 } 990 991 /* 992 * Arg: 993 * device : video output device (VGA) 994 * 995 * Return Value: 996 * None 997 * 998 * Find out all required AML methods defined under the video bus device. 999 */ 1000 1001 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1002 { 1003 if (acpi_has_method(video->device->handle, "_DOS")) 1004 video->cap._DOS = 1; 1005 if (acpi_has_method(video->device->handle, "_DOD")) 1006 video->cap._DOD = 1; 1007 if (acpi_has_method(video->device->handle, "_ROM")) 1008 video->cap._ROM = 1; 1009 if (acpi_has_method(video->device->handle, "_GPD")) 1010 video->cap._GPD = 1; 1011 if (acpi_has_method(video->device->handle, "_SPD")) 1012 video->cap._SPD = 1; 1013 if (acpi_has_method(video->device->handle, "_VPO")) 1014 video->cap._VPO = 1; 1015 } 1016 1017 /* 1018 * Check whether the video bus device has required AML method to 1019 * support the desired features 1020 */ 1021 1022 static int acpi_video_bus_check(struct acpi_video_bus *video) 1023 { 1024 acpi_status status = -ENOENT; 1025 struct pci_dev *dev; 1026 1027 if (!video) 1028 return -EINVAL; 1029 1030 dev = acpi_get_pci_dev(video->device->handle); 1031 if (!dev) 1032 return -ENODEV; 1033 pci_dev_put(dev); 1034 1035 /* 1036 * Since there is no HID, CID and so on for VGA driver, we have 1037 * to check well known required nodes. 1038 */ 1039 1040 /* Does this device support video switching? */ 1041 if (video->cap._DOS || video->cap._DOD) { 1042 if (!video->cap._DOS) { 1043 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1044 acpi_device_bid(video->device)); 1045 } 1046 video->flags.multihead = 1; 1047 status = 0; 1048 } 1049 1050 /* Does this device support retrieving a video ROM? */ 1051 if (video->cap._ROM) { 1052 video->flags.rom = 1; 1053 status = 0; 1054 } 1055 1056 /* Does this device support configuring which video device to POST? */ 1057 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1058 video->flags.post = 1; 1059 status = 0; 1060 } 1061 1062 return status; 1063 } 1064 1065 /* 1066 * -------------------------------------------------------------------------- 1067 * Driver Interface 1068 * -------------------------------------------------------------------------- 1069 */ 1070 1071 /* device interface */ 1072 static struct acpi_video_device_attrib * 1073 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1074 { 1075 struct acpi_video_enumerated_device *ids; 1076 int i; 1077 1078 for (i = 0; i < video->attached_count; i++) { 1079 ids = &video->attached_array[i]; 1080 if ((ids->value.int_val & 0xffff) == device_id) 1081 return &ids->value.attrib; 1082 } 1083 1084 return NULL; 1085 } 1086 1087 static int 1088 acpi_video_get_device_type(struct acpi_video_bus *video, 1089 unsigned long device_id) 1090 { 1091 struct acpi_video_enumerated_device *ids; 1092 int i; 1093 1094 for (i = 0; i < video->attached_count; i++) { 1095 ids = &video->attached_array[i]; 1096 if ((ids->value.int_val & 0xffff) == device_id) 1097 return ids->value.int_val; 1098 } 1099 1100 return 0; 1101 } 1102 1103 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1104 { 1105 struct acpi_video_bus *video = arg; 1106 struct acpi_video_device_attrib *attribute; 1107 struct acpi_video_device *data; 1108 unsigned long long device_id; 1109 acpi_status status; 1110 int device_type; 1111 1112 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1113 /* Skip devices without _ADR instead of failing. */ 1114 if (ACPI_FAILURE(status)) 1115 goto exit; 1116 1117 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1118 if (!data) { 1119 dev_dbg(&device->dev, "Cannot attach\n"); 1120 return -ENOMEM; 1121 } 1122 1123 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1124 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1125 1126 data->device_id = device_id; 1127 data->video = video; 1128 data->dev = device; 1129 INIT_DELAYED_WORK(&data->switch_brightness_work, 1130 acpi_video_switch_brightness); 1131 1132 attribute = acpi_video_get_device_attr(video, device_id); 1133 1134 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1135 switch (attribute->display_type) { 1136 case ACPI_VIDEO_DISPLAY_CRT: 1137 data->flags.crt = 1; 1138 break; 1139 case ACPI_VIDEO_DISPLAY_TV: 1140 data->flags.tvout = 1; 1141 break; 1142 case ACPI_VIDEO_DISPLAY_DVI: 1143 data->flags.dvi = 1; 1144 break; 1145 case ACPI_VIDEO_DISPLAY_LCD: 1146 data->flags.lcd = 1; 1147 break; 1148 default: 1149 data->flags.unknown = 1; 1150 break; 1151 } 1152 if (attribute->bios_can_detect) 1153 data->flags.bios = 1; 1154 } else { 1155 /* Check for legacy IDs */ 1156 device_type = acpi_video_get_device_type(video, device_id); 1157 /* Ignore bits 16 and 18-20 */ 1158 switch (device_type & 0xffe2ffff) { 1159 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1160 data->flags.crt = 1; 1161 break; 1162 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1163 data->flags.lcd = 1; 1164 break; 1165 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1166 data->flags.tvout = 1; 1167 break; 1168 default: 1169 data->flags.unknown = 1; 1170 } 1171 } 1172 1173 acpi_video_device_bind(video, data); 1174 acpi_video_device_find_cap(data); 1175 1176 if (data->cap._BCM && data->cap._BCL) 1177 may_report_brightness_keys = true; 1178 1179 mutex_lock(&video->device_list_lock); 1180 list_add_tail(&data->entry, &video->video_device_list); 1181 mutex_unlock(&video->device_list_lock); 1182 1183 exit: 1184 video->child_count++; 1185 return 0; 1186 } 1187 1188 /* 1189 * Arg: 1190 * video : video bus device 1191 * 1192 * Return: 1193 * none 1194 * 1195 * Enumerate the video device list of the video bus, 1196 * bind the ids with the corresponding video devices 1197 * under the video bus. 1198 */ 1199 1200 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1201 { 1202 struct acpi_video_device *dev; 1203 1204 mutex_lock(&video->device_list_lock); 1205 1206 list_for_each_entry(dev, &video->video_device_list, entry) 1207 acpi_video_device_bind(video, dev); 1208 1209 mutex_unlock(&video->device_list_lock); 1210 } 1211 1212 /* 1213 * Arg: 1214 * video : video bus device 1215 * device : video output device under the video 1216 * bus 1217 * 1218 * Return: 1219 * none 1220 * 1221 * Bind the ids with the corresponding video devices 1222 * under the video bus. 1223 */ 1224 1225 static void 1226 acpi_video_device_bind(struct acpi_video_bus *video, 1227 struct acpi_video_device *device) 1228 { 1229 struct acpi_video_enumerated_device *ids; 1230 int i; 1231 1232 for (i = 0; i < video->attached_count; i++) { 1233 ids = &video->attached_array[i]; 1234 if (device->device_id == (ids->value.int_val & 0xffff)) { 1235 ids->bind_info = device; 1236 acpi_handle_debug(video->device->handle, "%s: %d\n", 1237 __func__, i); 1238 } 1239 } 1240 } 1241 1242 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1243 { 1244 struct acpi_video_bus *video = device->video; 1245 int i; 1246 1247 /* 1248 * If we have a broken _DOD or we have more than 8 output devices 1249 * under the graphics controller node that we can't proper deal with 1250 * in the operation region code currently, no need to test. 1251 */ 1252 if (!video->attached_count || video->child_count > 8) 1253 return true; 1254 1255 for (i = 0; i < video->attached_count; i++) { 1256 if ((video->attached_array[i].value.int_val & 0xfff) == 1257 (device->device_id & 0xfff)) 1258 return true; 1259 } 1260 1261 return false; 1262 } 1263 1264 /* 1265 * Arg: 1266 * video : video bus device 1267 * 1268 * Return: 1269 * < 0 : error 1270 * 1271 * Call _DOD to enumerate all devices attached to display adapter 1272 * 1273 */ 1274 1275 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1276 { 1277 int status; 1278 int count; 1279 int i; 1280 struct acpi_video_enumerated_device *active_list; 1281 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1282 union acpi_object *dod = NULL; 1283 union acpi_object *obj; 1284 1285 if (!video->cap._DOD) 1286 return AE_NOT_EXIST; 1287 1288 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1289 if (ACPI_FAILURE(status)) { 1290 acpi_handle_info(video->device->handle, 1291 "_DOD evaluation failed: %s\n", 1292 acpi_format_exception(status)); 1293 return status; 1294 } 1295 1296 dod = buffer.pointer; 1297 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1298 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1299 status = -EFAULT; 1300 goto out; 1301 } 1302 1303 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1304 dod->package.count); 1305 1306 active_list = kcalloc(1 + dod->package.count, 1307 sizeof(struct acpi_video_enumerated_device), 1308 GFP_KERNEL); 1309 if (!active_list) { 1310 status = -ENOMEM; 1311 goto out; 1312 } 1313 1314 count = 0; 1315 for (i = 0; i < dod->package.count; i++) { 1316 obj = &dod->package.elements[i]; 1317 1318 if (obj->type != ACPI_TYPE_INTEGER) { 1319 acpi_handle_info(video->device->handle, 1320 "Invalid _DOD data in element %d\n", i); 1321 continue; 1322 } 1323 1324 active_list[count].value.int_val = obj->integer.value; 1325 active_list[count].bind_info = NULL; 1326 1327 acpi_handle_debug(video->device->handle, 1328 "_DOD element[%d] = %d\n", i, 1329 (int)obj->integer.value); 1330 1331 count++; 1332 } 1333 1334 kfree(video->attached_array); 1335 1336 video->attached_array = active_list; 1337 video->attached_count = count; 1338 1339 out: 1340 kfree(buffer.pointer); 1341 return status; 1342 } 1343 1344 static int 1345 acpi_video_get_next_level(struct acpi_video_device *device, 1346 u32 level_current, u32 event) 1347 { 1348 int min, max, min_above, max_below, i, l, delta = 255; 1349 max = max_below = 0; 1350 min = min_above = 255; 1351 /* Find closest level to level_current */ 1352 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1353 l = device->brightness->levels[i]; 1354 if (abs(l - level_current) < abs(delta)) { 1355 delta = l - level_current; 1356 if (!delta) 1357 break; 1358 } 1359 } 1360 /* Adjust level_current to closest available level */ 1361 level_current += delta; 1362 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1363 l = device->brightness->levels[i]; 1364 if (l < min) 1365 min = l; 1366 if (l > max) 1367 max = l; 1368 if (l < min_above && l > level_current) 1369 min_above = l; 1370 if (l > max_below && l < level_current) 1371 max_below = l; 1372 } 1373 1374 switch (event) { 1375 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1376 return (level_current < max) ? min_above : min; 1377 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1378 return (level_current < max) ? min_above : max; 1379 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1380 return (level_current > min) ? max_below : min; 1381 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1382 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1383 return 0; 1384 default: 1385 return level_current; 1386 } 1387 } 1388 1389 static void 1390 acpi_video_switch_brightness(struct work_struct *work) 1391 { 1392 struct acpi_video_device *device = container_of(to_delayed_work(work), 1393 struct acpi_video_device, switch_brightness_work); 1394 unsigned long long level_current, level_next; 1395 int event = device->switch_brightness_event; 1396 int result = -EINVAL; 1397 1398 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1399 if (!device->backlight) 1400 return; 1401 1402 if (!device->brightness) 1403 goto out; 1404 1405 result = acpi_video_device_lcd_get_level_current(device, 1406 &level_current, 1407 false); 1408 if (result) 1409 goto out; 1410 1411 level_next = acpi_video_get_next_level(device, level_current, event); 1412 1413 result = acpi_video_device_lcd_set_level(device, level_next); 1414 1415 if (!result) 1416 backlight_force_update(device->backlight, 1417 BACKLIGHT_UPDATE_HOTKEY); 1418 1419 out: 1420 if (result) 1421 acpi_handle_info(device->dev->handle, 1422 "Failed to switch brightness\n"); 1423 } 1424 1425 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1426 void **edid) 1427 { 1428 struct acpi_video_bus *video; 1429 struct acpi_video_device *video_device; 1430 union acpi_object *buffer = NULL; 1431 acpi_status status; 1432 int i, length; 1433 1434 if (!device || !acpi_driver_data(device)) 1435 return -EINVAL; 1436 1437 video = acpi_driver_data(device); 1438 1439 for (i = 0; i < video->attached_count; i++) { 1440 video_device = video->attached_array[i].bind_info; 1441 length = 256; 1442 1443 if (!video_device) 1444 continue; 1445 1446 if (!video_device->cap._DDC) 1447 continue; 1448 1449 if (type) { 1450 switch (type) { 1451 case ACPI_VIDEO_DISPLAY_CRT: 1452 if (!video_device->flags.crt) 1453 continue; 1454 break; 1455 case ACPI_VIDEO_DISPLAY_TV: 1456 if (!video_device->flags.tvout) 1457 continue; 1458 break; 1459 case ACPI_VIDEO_DISPLAY_DVI: 1460 if (!video_device->flags.dvi) 1461 continue; 1462 break; 1463 case ACPI_VIDEO_DISPLAY_LCD: 1464 if (!video_device->flags.lcd) 1465 continue; 1466 break; 1467 } 1468 } else if (video_device->device_id != device_id) { 1469 continue; 1470 } 1471 1472 status = acpi_video_device_EDID(video_device, &buffer, length); 1473 1474 if (ACPI_FAILURE(status) || !buffer || 1475 buffer->type != ACPI_TYPE_BUFFER) { 1476 length = 128; 1477 status = acpi_video_device_EDID(video_device, &buffer, 1478 length); 1479 if (ACPI_FAILURE(status) || !buffer || 1480 buffer->type != ACPI_TYPE_BUFFER) { 1481 continue; 1482 } 1483 } 1484 1485 *edid = buffer->buffer.pointer; 1486 return length; 1487 } 1488 1489 return -ENODEV; 1490 } 1491 EXPORT_SYMBOL(acpi_video_get_edid); 1492 1493 static int 1494 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1495 struct acpi_device *device) 1496 { 1497 /* 1498 * There are systems where video module known to work fine regardless 1499 * of broken _DOD and ignoring returned value here doesn't cause 1500 * any issues later. 1501 */ 1502 acpi_video_device_enumerate(video); 1503 1504 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1505 } 1506 1507 /* acpi_video interface */ 1508 1509 /* 1510 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1511 * perform any automatic brightness change on receiving a notification. 1512 */ 1513 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1514 { 1515 return acpi_video_bus_DOS(video, 0, 1516 acpi_osi_is_win8() ? 1 : 0); 1517 } 1518 1519 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1520 { 1521 return acpi_video_bus_DOS(video, 0, 1522 acpi_osi_is_win8() ? 0 : 1); 1523 } 1524 1525 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data) 1526 { 1527 struct acpi_device *device = data; 1528 struct acpi_video_bus *video = acpi_driver_data(device); 1529 struct input_dev *input; 1530 int keycode = 0; 1531 1532 if (!video || !video->input) 1533 return; 1534 1535 input = video->input; 1536 1537 switch (event) { 1538 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1539 * most likely via hotkey. */ 1540 keycode = KEY_SWITCHVIDEOMODE; 1541 break; 1542 1543 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1544 * connector. */ 1545 acpi_video_device_enumerate(video); 1546 acpi_video_device_rebind(video); 1547 keycode = KEY_SWITCHVIDEOMODE; 1548 break; 1549 1550 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1551 keycode = KEY_SWITCHVIDEOMODE; 1552 break; 1553 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1554 keycode = KEY_VIDEO_NEXT; 1555 break; 1556 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1557 keycode = KEY_VIDEO_PREV; 1558 break; 1559 1560 default: 1561 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1562 event); 1563 break; 1564 } 1565 1566 if (acpi_notifier_call_chain(device, event, 0)) 1567 /* Something vetoed the keypress. */ 1568 keycode = 0; 1569 1570 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1571 input_report_key(input, keycode, 1); 1572 input_sync(input); 1573 input_report_key(input, keycode, 0); 1574 input_sync(input); 1575 } 1576 } 1577 1578 static void brightness_switch_event(struct acpi_video_device *video_device, 1579 u32 event) 1580 { 1581 if (!brightness_switch_enabled) 1582 return; 1583 1584 video_device->switch_brightness_event = event; 1585 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1586 } 1587 1588 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1589 { 1590 struct acpi_video_device *video_device = data; 1591 struct acpi_device *device = NULL; 1592 struct acpi_video_bus *bus; 1593 struct input_dev *input; 1594 int keycode = 0; 1595 1596 if (!video_device) 1597 return; 1598 1599 device = video_device->dev; 1600 bus = video_device->video; 1601 input = bus->input; 1602 1603 if (hw_changes_brightness > 0) { 1604 if (video_device->backlight) 1605 backlight_force_update(video_device->backlight, 1606 BACKLIGHT_UPDATE_HOTKEY); 1607 acpi_notifier_call_chain(device, event, 0); 1608 return; 1609 } 1610 1611 switch (event) { 1612 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1613 brightness_switch_event(video_device, event); 1614 keycode = KEY_BRIGHTNESS_CYCLE; 1615 break; 1616 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1617 brightness_switch_event(video_device, event); 1618 keycode = KEY_BRIGHTNESSUP; 1619 break; 1620 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1621 brightness_switch_event(video_device, event); 1622 keycode = KEY_BRIGHTNESSDOWN; 1623 break; 1624 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1625 brightness_switch_event(video_device, event); 1626 keycode = KEY_BRIGHTNESS_ZERO; 1627 break; 1628 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1629 brightness_switch_event(video_device, event); 1630 keycode = KEY_DISPLAY_OFF; 1631 break; 1632 default: 1633 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1634 break; 1635 } 1636 1637 if (keycode) 1638 may_report_brightness_keys = true; 1639 1640 acpi_notifier_call_chain(device, event, 0); 1641 1642 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1643 input_report_key(input, keycode, 1); 1644 input_sync(input); 1645 input_report_key(input, keycode, 0); 1646 input_sync(input); 1647 } 1648 } 1649 1650 static int acpi_video_resume(struct notifier_block *nb, 1651 unsigned long val, void *ign) 1652 { 1653 struct acpi_video_bus *video; 1654 struct acpi_video_device *video_device; 1655 int i; 1656 1657 switch (val) { 1658 case PM_POST_HIBERNATION: 1659 case PM_POST_SUSPEND: 1660 case PM_POST_RESTORE: 1661 video = container_of(nb, struct acpi_video_bus, pm_nb); 1662 1663 dev_info(&video->device->dev, "Restoring backlight state\n"); 1664 1665 for (i = 0; i < video->attached_count; i++) { 1666 video_device = video->attached_array[i].bind_info; 1667 if (video_device && video_device->brightness) 1668 acpi_video_device_lcd_set_level(video_device, 1669 video_device->brightness->curr); 1670 } 1671 1672 return NOTIFY_OK; 1673 } 1674 return NOTIFY_DONE; 1675 } 1676 1677 static acpi_status 1678 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1679 void **return_value) 1680 { 1681 struct acpi_device *device = context; 1682 struct acpi_device *sibling; 1683 1684 if (handle == device->handle) 1685 return AE_CTRL_TERMINATE; 1686 1687 sibling = acpi_fetch_acpi_dev(handle); 1688 if (!sibling) 1689 return AE_OK; 1690 1691 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1692 return AE_ALREADY_EXISTS; 1693 1694 return AE_OK; 1695 } 1696 1697 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1698 { 1699 struct backlight_properties props; 1700 struct pci_dev *pdev; 1701 acpi_handle acpi_parent; 1702 struct device *parent = NULL; 1703 int result; 1704 static int count; 1705 char *name; 1706 1707 result = acpi_video_init_brightness(device); 1708 if (result) 1709 return; 1710 1711 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1712 if (!name) 1713 return; 1714 count++; 1715 1716 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) { 1717 pdev = acpi_get_pci_dev(acpi_parent); 1718 if (pdev) { 1719 parent = &pdev->dev; 1720 pci_dev_put(pdev); 1721 } 1722 } 1723 1724 memset(&props, 0, sizeof(struct backlight_properties)); 1725 props.type = BACKLIGHT_FIRMWARE; 1726 props.max_brightness = 1727 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1728 device->backlight = backlight_device_register(name, 1729 parent, 1730 device, 1731 &acpi_backlight_ops, 1732 &props); 1733 kfree(name); 1734 if (IS_ERR(device->backlight)) { 1735 device->backlight = NULL; 1736 return; 1737 } 1738 1739 /* 1740 * Save current brightness level in case we have to restore it 1741 * before acpi_video_device_lcd_set_level() is called next time. 1742 */ 1743 device->backlight->props.brightness = 1744 acpi_video_get_brightness(device->backlight); 1745 1746 device->cooling_dev = thermal_cooling_device_register("LCD", device, 1747 &video_cooling_ops); 1748 if (IS_ERR(device->cooling_dev)) { 1749 /* 1750 * Set cooling_dev to NULL so we don't crash trying to free it. 1751 * Also, why the hell we are returning early and not attempt to 1752 * register video output if cooling device registration failed? 1753 * -- dtor 1754 */ 1755 device->cooling_dev = NULL; 1756 return; 1757 } 1758 1759 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1760 device->cooling_dev->id); 1761 result = sysfs_create_link(&device->dev->dev.kobj, 1762 &device->cooling_dev->device.kobj, 1763 "thermal_cooling"); 1764 if (result) 1765 pr_info("sysfs link creation failed\n"); 1766 1767 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1768 &device->dev->dev.kobj, "device"); 1769 if (result) 1770 pr_info("Reverse sysfs link creation failed\n"); 1771 } 1772 1773 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1774 { 1775 struct acpi_video_device *dev; 1776 union acpi_object *levels; 1777 1778 mutex_lock(&video->device_list_lock); 1779 list_for_each_entry(dev, &video->video_device_list, entry) { 1780 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1781 kfree(levels); 1782 } 1783 mutex_unlock(&video->device_list_lock); 1784 } 1785 1786 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1787 { 1788 /* 1789 * Do not create backlight device for video output 1790 * device that is not in the enumerated list. 1791 */ 1792 if (!acpi_video_device_in_dod(dev)) { 1793 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1794 return false; 1795 } 1796 1797 if (only_lcd) 1798 return dev->flags.lcd; 1799 return true; 1800 } 1801 1802 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1803 { 1804 struct acpi_video_device *dev; 1805 1806 if (video->backlight_registered) 1807 return 0; 1808 1809 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1810 return 0; 1811 1812 mutex_lock(&video->device_list_lock); 1813 list_for_each_entry(dev, &video->video_device_list, entry) { 1814 if (acpi_video_should_register_backlight(dev)) 1815 acpi_video_dev_register_backlight(dev); 1816 } 1817 mutex_unlock(&video->device_list_lock); 1818 1819 video->backlight_registered = true; 1820 1821 video->pm_nb.notifier_call = acpi_video_resume; 1822 video->pm_nb.priority = 0; 1823 return register_pm_notifier(&video->pm_nb); 1824 } 1825 1826 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1827 { 1828 if (device->backlight) { 1829 backlight_device_unregister(device->backlight); 1830 device->backlight = NULL; 1831 } 1832 if (device->brightness) { 1833 kfree(device->brightness->levels); 1834 kfree(device->brightness); 1835 device->brightness = NULL; 1836 } 1837 if (device->cooling_dev) { 1838 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1839 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1840 thermal_cooling_device_unregister(device->cooling_dev); 1841 device->cooling_dev = NULL; 1842 } 1843 } 1844 1845 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1846 { 1847 struct acpi_video_device *dev; 1848 int error; 1849 1850 if (!video->backlight_registered) 1851 return 0; 1852 1853 error = unregister_pm_notifier(&video->pm_nb); 1854 1855 mutex_lock(&video->device_list_lock); 1856 list_for_each_entry(dev, &video->video_device_list, entry) 1857 acpi_video_dev_unregister_backlight(dev); 1858 mutex_unlock(&video->device_list_lock); 1859 1860 video->backlight_registered = false; 1861 1862 return error; 1863 } 1864 1865 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1866 { 1867 acpi_status status; 1868 struct acpi_device *adev = device->dev; 1869 1870 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1871 acpi_video_device_notify, device); 1872 if (ACPI_FAILURE(status)) 1873 dev_err(&adev->dev, "Error installing notify handler\n"); 1874 else 1875 device->flags.notify = 1; 1876 } 1877 1878 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1879 { 1880 struct input_dev *input; 1881 struct acpi_video_device *dev; 1882 int error; 1883 1884 video->input = input = input_allocate_device(); 1885 if (!input) { 1886 error = -ENOMEM; 1887 goto out; 1888 } 1889 1890 error = acpi_video_bus_start_devices(video); 1891 if (error) 1892 goto err_free_input; 1893 1894 snprintf(video->phys, sizeof(video->phys), 1895 "%s/video/input0", acpi_device_hid(video->device)); 1896 1897 input->name = acpi_device_name(video->device); 1898 input->phys = video->phys; 1899 input->id.bustype = BUS_HOST; 1900 input->id.product = 0x06; 1901 input->dev.parent = &video->device->dev; 1902 input->evbit[0] = BIT(EV_KEY); 1903 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1904 set_bit(KEY_VIDEO_NEXT, input->keybit); 1905 set_bit(KEY_VIDEO_PREV, input->keybit); 1906 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1907 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1908 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1909 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1910 set_bit(KEY_DISPLAY_OFF, input->keybit); 1911 1912 error = input_register_device(input); 1913 if (error) 1914 goto err_stop_dev; 1915 1916 mutex_lock(&video->device_list_lock); 1917 list_for_each_entry(dev, &video->video_device_list, entry) 1918 acpi_video_dev_add_notify_handler(dev); 1919 mutex_unlock(&video->device_list_lock); 1920 1921 return 0; 1922 1923 err_stop_dev: 1924 acpi_video_bus_stop_devices(video); 1925 err_free_input: 1926 input_free_device(input); 1927 video->input = NULL; 1928 out: 1929 return error; 1930 } 1931 1932 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1933 { 1934 if (dev->flags.notify) { 1935 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1936 acpi_video_device_notify); 1937 dev->flags.notify = 0; 1938 } 1939 } 1940 1941 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1942 { 1943 struct acpi_video_device *dev; 1944 1945 mutex_lock(&video->device_list_lock); 1946 list_for_each_entry(dev, &video->video_device_list, entry) 1947 acpi_video_dev_remove_notify_handler(dev); 1948 mutex_unlock(&video->device_list_lock); 1949 1950 acpi_video_bus_stop_devices(video); 1951 input_unregister_device(video->input); 1952 video->input = NULL; 1953 } 1954 1955 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1956 { 1957 struct acpi_video_device *dev, *next; 1958 1959 mutex_lock(&video->device_list_lock); 1960 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1961 list_del(&dev->entry); 1962 kfree(dev); 1963 } 1964 mutex_unlock(&video->device_list_lock); 1965 1966 return 0; 1967 } 1968 1969 static int instance; 1970 1971 static int acpi_video_bus_add(struct acpi_device *device) 1972 { 1973 struct acpi_video_bus *video; 1974 bool auto_detect; 1975 int error; 1976 acpi_status status; 1977 1978 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1979 acpi_dev_parent(device)->handle, 1, 1980 acpi_video_bus_match, NULL, 1981 device, NULL); 1982 if (status == AE_ALREADY_EXISTS) { 1983 pr_info(FW_BUG 1984 "Duplicate ACPI video bus devices for the" 1985 " same VGA controller, please try module " 1986 "parameter \"video.allow_duplicates=1\"" 1987 "if the current driver doesn't work.\n"); 1988 if (!allow_duplicates) 1989 return -ENODEV; 1990 } 1991 1992 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 1993 if (!video) 1994 return -ENOMEM; 1995 1996 /* a hack to fix the duplicate name "VID" problem on T61 */ 1997 if (!strcmp(device->pnp.bus_id, "VID")) { 1998 if (instance) 1999 device->pnp.bus_id[3] = '0' + instance; 2000 instance++; 2001 } 2002 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2003 if (!strcmp(device->pnp.bus_id, "VGA")) { 2004 if (instance) 2005 device->pnp.bus_id[3] = '0' + instance; 2006 instance++; 2007 } 2008 2009 video->device = device; 2010 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2011 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2012 device->driver_data = video; 2013 2014 acpi_video_bus_find_cap(video); 2015 error = acpi_video_bus_check(video); 2016 if (error) 2017 goto err_free_video; 2018 2019 mutex_init(&video->device_list_lock); 2020 INIT_LIST_HEAD(&video->video_device_list); 2021 2022 error = acpi_video_bus_get_devices(video, device); 2023 if (error) 2024 goto err_put_video; 2025 2026 /* 2027 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0 2028 * evaluated to have functional panel brightness control. 2029 */ 2030 acpi_device_fix_up_power_children(device); 2031 2032 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2033 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2034 video->flags.multihead ? "yes" : "no", 2035 video->flags.rom ? "yes" : "no", 2036 video->flags.post ? "yes" : "no"); 2037 mutex_lock(&video_list_lock); 2038 list_add_tail(&video->entry, &video_bus_head); 2039 mutex_unlock(&video_list_lock); 2040 2041 /* 2042 * If backlight-type auto-detection is used then a native backlight may 2043 * show up later and this may change the result from video to native. 2044 * Therefor normally the userspace visible /sys/class/backlight device 2045 * gets registered separately by the GPU driver calling 2046 * acpi_video_register_backlight() when an internal panel is detected. 2047 * Register the backlight now when not using auto-detection, so that 2048 * when the kernel cmdline or DMI-quirks are used the backlight will 2049 * get registered even if acpi_video_register_backlight() is not called. 2050 */ 2051 acpi_video_run_bcl_for_osi(video); 2052 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && 2053 !auto_detect) 2054 acpi_video_bus_register_backlight(video); 2055 2056 error = acpi_video_bus_add_notify_handler(video); 2057 if (error) 2058 goto err_del; 2059 2060 error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, 2061 acpi_video_bus_notify); 2062 if (error) 2063 goto err_remove; 2064 2065 return 0; 2066 2067 err_remove: 2068 acpi_video_bus_remove_notify_handler(video); 2069 err_del: 2070 mutex_lock(&video_list_lock); 2071 list_del(&video->entry); 2072 mutex_unlock(&video_list_lock); 2073 acpi_video_bus_unregister_backlight(video); 2074 err_put_video: 2075 acpi_video_bus_put_devices(video); 2076 kfree(video->attached_array); 2077 err_free_video: 2078 kfree(video); 2079 device->driver_data = NULL; 2080 2081 return error; 2082 } 2083 2084 static void acpi_video_bus_remove(struct acpi_device *device) 2085 { 2086 struct acpi_video_bus *video = NULL; 2087 2088 2089 if (!device || !acpi_driver_data(device)) 2090 return; 2091 2092 video = acpi_driver_data(device); 2093 2094 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, 2095 acpi_video_bus_notify); 2096 2097 mutex_lock(&video_list_lock); 2098 list_del(&video->entry); 2099 mutex_unlock(&video_list_lock); 2100 2101 acpi_video_bus_remove_notify_handler(video); 2102 acpi_video_bus_unregister_backlight(video); 2103 acpi_video_bus_put_devices(video); 2104 2105 kfree(video->attached_array); 2106 kfree(video); 2107 } 2108 2109 static int __init is_i740(struct pci_dev *dev) 2110 { 2111 if (dev->device == 0x00D1) 2112 return 1; 2113 if (dev->device == 0x7000) 2114 return 1; 2115 return 0; 2116 } 2117 2118 static int __init intel_opregion_present(void) 2119 { 2120 int opregion = 0; 2121 struct pci_dev *dev = NULL; 2122 u32 address; 2123 2124 for_each_pci_dev(dev) { 2125 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2126 continue; 2127 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2128 continue; 2129 /* We don't want to poke around undefined i740 registers */ 2130 if (is_i740(dev)) 2131 continue; 2132 pci_read_config_dword(dev, 0xfc, &address); 2133 if (!address) 2134 continue; 2135 opregion = 1; 2136 } 2137 return opregion; 2138 } 2139 2140 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2141 static bool dmi_is_desktop(void) 2142 { 2143 const char *chassis_type; 2144 unsigned long type; 2145 2146 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2147 if (!chassis_type) 2148 return false; 2149 2150 if (kstrtoul(chassis_type, 10, &type) != 0) 2151 return false; 2152 2153 switch (type) { 2154 case 0x03: /* Desktop */ 2155 case 0x04: /* Low Profile Desktop */ 2156 case 0x05: /* Pizza Box */ 2157 case 0x06: /* Mini Tower */ 2158 case 0x07: /* Tower */ 2159 case 0x10: /* Lunch Box */ 2160 case 0x11: /* Main Server Chassis */ 2161 return true; 2162 } 2163 2164 return false; 2165 } 2166 2167 /* 2168 * We're seeing a lot of bogus backlight interfaces on newer machines 2169 * without a LCD such as desktops, servers and HDMI sticks. Checking the 2170 * lcd flag fixes this, enable this by default on any machines which are: 2171 * 1. Win8 ready (where we also prefer the native backlight driver, so 2172 * normally the acpi_video code should not register there anyways); *and* 2173 * 2.1 Report a desktop/server DMI chassis-type, or 2174 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for 2175 backlight control) 2176 */ 2177 static bool should_check_lcd_flag(void) 2178 { 2179 if (!acpi_osi_is_win8()) 2180 return false; 2181 2182 if (dmi_is_desktop()) 2183 return true; 2184 2185 if (acpi_reduced_hardware()) 2186 return true; 2187 2188 return false; 2189 } 2190 2191 int acpi_video_register(void) 2192 { 2193 int ret = 0; 2194 2195 mutex_lock(®ister_count_mutex); 2196 if (register_count) { 2197 /* 2198 * if the function of acpi_video_register is already called, 2199 * don't register the acpi_video_bus again and return no error. 2200 */ 2201 goto leave; 2202 } 2203 2204 if (only_lcd == -1) 2205 only_lcd = should_check_lcd_flag(); 2206 2207 dmi_check_system(video_dmi_table); 2208 2209 ret = acpi_bus_register_driver(&acpi_video_bus); 2210 if (ret) 2211 goto leave; 2212 2213 /* 2214 * When the acpi_video_bus is loaded successfully, increase 2215 * the counter reference. 2216 */ 2217 register_count = 1; 2218 2219 leave: 2220 mutex_unlock(®ister_count_mutex); 2221 return ret; 2222 } 2223 EXPORT_SYMBOL(acpi_video_register); 2224 2225 void acpi_video_unregister(void) 2226 { 2227 mutex_lock(®ister_count_mutex); 2228 if (register_count) { 2229 acpi_bus_unregister_driver(&acpi_video_bus); 2230 register_count = 0; 2231 may_report_brightness_keys = false; 2232 } 2233 mutex_unlock(®ister_count_mutex); 2234 } 2235 EXPORT_SYMBOL(acpi_video_unregister); 2236 2237 void acpi_video_register_backlight(void) 2238 { 2239 struct acpi_video_bus *video; 2240 2241 mutex_lock(&video_list_lock); 2242 list_for_each_entry(video, &video_bus_head, entry) 2243 acpi_video_bus_register_backlight(video); 2244 mutex_unlock(&video_list_lock); 2245 } 2246 EXPORT_SYMBOL(acpi_video_register_backlight); 2247 2248 bool acpi_video_handles_brightness_key_presses(void) 2249 { 2250 return may_report_brightness_keys && 2251 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2252 } 2253 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2254 2255 /* 2256 * This is kind of nasty. Hardware using Intel chipsets may require 2257 * the video opregion code to be run first in order to initialise 2258 * state before any ACPI video calls are made. To handle this we defer 2259 * registration of the video class until the opregion code has run. 2260 */ 2261 2262 static int __init acpi_video_init(void) 2263 { 2264 /* 2265 * Let the module load even if ACPI is disabled (e.g. due to 2266 * a broken BIOS) so that i915.ko can still be loaded on such 2267 * old systems without an AcpiOpRegion. 2268 * 2269 * acpi_video_register() will report -ENODEV later as well due 2270 * to acpi_disabled when i915.ko tries to register itself afterwards. 2271 */ 2272 if (acpi_disabled) 2273 return 0; 2274 2275 if (intel_opregion_present()) 2276 return 0; 2277 2278 return acpi_video_register(); 2279 } 2280 2281 static void __exit acpi_video_exit(void) 2282 { 2283 acpi_video_unregister(); 2284 } 2285 2286 module_init(acpi_video_init); 2287 module_exit(acpi_video_exit); 2288