1 /* 2 * video.c - ACPI Video Driver 3 * 4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> 5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org> 6 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or (at 13 * your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/types.h> 27 #include <linux/list.h> 28 #include <linux/mutex.h> 29 #include <linux/input.h> 30 #include <linux/backlight.h> 31 #include <linux/thermal.h> 32 #include <linux/sort.h> 33 #include <linux/pci.h> 34 #include <linux/pci_ids.h> 35 #include <linux/slab.h> 36 #include <linux/dmi.h> 37 #include <linux/suspend.h> 38 #include <linux/acpi.h> 39 #include <acpi/video.h> 40 #include <asm/uaccess.h> 41 42 #define PREFIX "ACPI: " 43 44 #define ACPI_VIDEO_BUS_NAME "Video Bus" 45 #define ACPI_VIDEO_DEVICE_NAME "Video Device" 46 #define ACPI_VIDEO_NOTIFY_SWITCH 0x80 47 #define ACPI_VIDEO_NOTIFY_PROBE 0x81 48 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82 49 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83 50 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84 51 52 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85 53 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86 54 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87 55 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88 56 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89 57 58 #define MAX_NAME_LEN 20 59 60 #define _COMPONENT ACPI_VIDEO_COMPONENT 61 ACPI_MODULE_NAME("video"); 62 63 MODULE_AUTHOR("Bruno Ducrot"); 64 MODULE_DESCRIPTION("ACPI Video Driver"); 65 MODULE_LICENSE("GPL"); 66 67 static bool brightness_switch_enabled = 1; 68 module_param(brightness_switch_enabled, bool, 0644); 69 70 /* 71 * By default, we don't allow duplicate ACPI video bus devices 72 * under the same VGA controller 73 */ 74 static bool allow_duplicates; 75 module_param(allow_duplicates, bool, 0644); 76 77 static int disable_backlight_sysfs_if = -1; 78 module_param(disable_backlight_sysfs_if, int, 0444); 79 80 #define REPORT_OUTPUT_KEY_EVENTS 0x01 81 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 82 static int report_key_events = -1; 83 module_param(report_key_events, int, 0644); 84 MODULE_PARM_DESC(report_key_events, 85 "0: none, 1: output changes, 2: brightness changes, 3: all"); 86 87 static bool device_id_scheme = false; 88 module_param(device_id_scheme, bool, 0444); 89 90 static bool only_lcd = false; 91 module_param(only_lcd, bool, 0444); 92 93 static int register_count; 94 static DEFINE_MUTEX(register_count_mutex); 95 static DEFINE_MUTEX(video_list_lock); 96 static LIST_HEAD(video_bus_head); 97 static int acpi_video_bus_add(struct acpi_device *device); 98 static int acpi_video_bus_remove(struct acpi_device *device); 99 static void acpi_video_bus_notify(struct acpi_device *device, u32 event); 100 void acpi_video_detect_exit(void); 101 102 static const struct acpi_device_id video_device_ids[] = { 103 {ACPI_VIDEO_HID, 0}, 104 {"", 0}, 105 }; 106 MODULE_DEVICE_TABLE(acpi, video_device_ids); 107 108 static struct acpi_driver acpi_video_bus = { 109 .name = "video", 110 .class = ACPI_VIDEO_CLASS, 111 .ids = video_device_ids, 112 .ops = { 113 .add = acpi_video_bus_add, 114 .remove = acpi_video_bus_remove, 115 .notify = acpi_video_bus_notify, 116 }, 117 }; 118 119 struct acpi_video_bus_flags { 120 u8 multihead:1; /* can switch video heads */ 121 u8 rom:1; /* can retrieve a video rom */ 122 u8 post:1; /* can configure the head to */ 123 u8 reserved:5; 124 }; 125 126 struct acpi_video_bus_cap { 127 u8 _DOS:1; /* Enable/Disable output switching */ 128 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 129 u8 _ROM:1; /* Get ROM Data */ 130 u8 _GPD:1; /* Get POST Device */ 131 u8 _SPD:1; /* Set POST Device */ 132 u8 _VPO:1; /* Video POST Options */ 133 u8 reserved:2; 134 }; 135 136 struct acpi_video_device_attrib { 137 u32 display_index:4; /* A zero-based instance of the Display */ 138 u32 display_port_attachment:4; /* This field differentiates the display type */ 139 u32 display_type:4; /* Describe the specific type in use */ 140 u32 vendor_specific:4; /* Chipset Vendor Specific */ 141 u32 bios_can_detect:1; /* BIOS can detect the device */ 142 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 143 the VGA device. */ 144 u32 pipe_id:3; /* For VGA multiple-head devices. */ 145 u32 reserved:10; /* Must be 0 */ 146 u32 device_id_scheme:1; /* Device ID Scheme */ 147 }; 148 149 struct acpi_video_enumerated_device { 150 union { 151 u32 int_val; 152 struct acpi_video_device_attrib attrib; 153 } value; 154 struct acpi_video_device *bind_info; 155 }; 156 157 struct acpi_video_bus { 158 struct acpi_device *device; 159 bool backlight_registered; 160 u8 dos_setting; 161 struct acpi_video_enumerated_device *attached_array; 162 u8 attached_count; 163 u8 child_count; 164 struct acpi_video_bus_cap cap; 165 struct acpi_video_bus_flags flags; 166 struct list_head video_device_list; 167 struct mutex device_list_lock; /* protects video_device_list */ 168 struct list_head entry; 169 struct input_dev *input; 170 char phys[32]; /* for input device */ 171 struct notifier_block pm_nb; 172 }; 173 174 struct acpi_video_device_flags { 175 u8 crt:1; 176 u8 lcd:1; 177 u8 tvout:1; 178 u8 dvi:1; 179 u8 bios:1; 180 u8 unknown:1; 181 u8 notify:1; 182 u8 reserved:1; 183 }; 184 185 struct acpi_video_device_cap { 186 u8 _ADR:1; /* Return the unique ID */ 187 u8 _BCL:1; /* Query list of brightness control levels supported */ 188 u8 _BCM:1; /* Set the brightness level */ 189 u8 _BQC:1; /* Get current brightness level */ 190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 191 u8 _DDC:1; /* Return the EDID for this device */ 192 }; 193 194 struct acpi_video_brightness_flags { 195 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */ 196 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */ 197 u8 _BQC_use_index:1; /* _BQC returns an index value */ 198 }; 199 200 struct acpi_video_device_brightness { 201 int curr; 202 int count; 203 int *levels; 204 struct acpi_video_brightness_flags flags; 205 }; 206 207 struct acpi_video_device { 208 unsigned long device_id; 209 struct acpi_video_device_flags flags; 210 struct acpi_video_device_cap cap; 211 struct list_head entry; 212 struct delayed_work switch_brightness_work; 213 int switch_brightness_event; 214 struct acpi_video_bus *video; 215 struct acpi_device *dev; 216 struct acpi_video_device_brightness *brightness; 217 struct backlight_device *backlight; 218 struct thermal_cooling_device *cooling_dev; 219 }; 220 221 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 222 static void acpi_video_device_rebind(struct acpi_video_bus *video); 223 static void acpi_video_device_bind(struct acpi_video_bus *video, 224 struct acpi_video_device *device); 225 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 226 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 227 int level); 228 static int acpi_video_device_lcd_get_level_current( 229 struct acpi_video_device *device, 230 unsigned long long *level, bool raw); 231 static int acpi_video_get_next_level(struct acpi_video_device *device, 232 u32 level_current, u32 event); 233 static void acpi_video_switch_brightness(struct work_struct *work); 234 235 /* backlight device sysfs support */ 236 static int acpi_video_get_brightness(struct backlight_device *bd) 237 { 238 unsigned long long cur_level; 239 int i; 240 struct acpi_video_device *vd = bl_get_data(bd); 241 242 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 243 return -EINVAL; 244 for (i = 2; i < vd->brightness->count; i++) { 245 if (vd->brightness->levels[i] == cur_level) 246 /* 247 * The first two entries are special - see page 575 248 * of the ACPI spec 3.0 249 */ 250 return i - 2; 251 } 252 return 0; 253 } 254 255 static int acpi_video_set_brightness(struct backlight_device *bd) 256 { 257 int request_level = bd->props.brightness + 2; 258 struct acpi_video_device *vd = bl_get_data(bd); 259 260 cancel_delayed_work(&vd->switch_brightness_work); 261 return acpi_video_device_lcd_set_level(vd, 262 vd->brightness->levels[request_level]); 263 } 264 265 static const struct backlight_ops acpi_backlight_ops = { 266 .get_brightness = acpi_video_get_brightness, 267 .update_status = acpi_video_set_brightness, 268 }; 269 270 /* thermal cooling device callbacks */ 271 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned 272 long *state) 273 { 274 struct acpi_device *device = cooling_dev->devdata; 275 struct acpi_video_device *video = acpi_driver_data(device); 276 277 *state = video->brightness->count - 3; 278 return 0; 279 } 280 281 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned 282 long *state) 283 { 284 struct acpi_device *device = cooling_dev->devdata; 285 struct acpi_video_device *video = acpi_driver_data(device); 286 unsigned long long level; 287 int offset; 288 289 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 290 return -EINVAL; 291 for (offset = 2; offset < video->brightness->count; offset++) 292 if (level == video->brightness->levels[offset]) { 293 *state = video->brightness->count - offset - 1; 294 return 0; 295 } 296 297 return -EINVAL; 298 } 299 300 static int 301 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 302 { 303 struct acpi_device *device = cooling_dev->devdata; 304 struct acpi_video_device *video = acpi_driver_data(device); 305 int level; 306 307 if (state >= video->brightness->count - 2) 308 return -EINVAL; 309 310 state = video->brightness->count - state; 311 level = video->brightness->levels[state - 1]; 312 return acpi_video_device_lcd_set_level(video, level); 313 } 314 315 static const struct thermal_cooling_device_ops video_cooling_ops = { 316 .get_max_state = video_get_max_state, 317 .get_cur_state = video_get_cur_state, 318 .set_cur_state = video_set_cur_state, 319 }; 320 321 /* 322 * -------------------------------------------------------------------------- 323 * Video Management 324 * -------------------------------------------------------------------------- 325 */ 326 327 static int 328 acpi_video_device_lcd_query_levels(struct acpi_video_device *device, 329 union acpi_object **levels) 330 { 331 int status; 332 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 333 union acpi_object *obj; 334 335 336 *levels = NULL; 337 338 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer); 339 if (!ACPI_SUCCESS(status)) 340 return status; 341 obj = (union acpi_object *)buffer.pointer; 342 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 343 printk(KERN_ERR PREFIX "Invalid _BCL data\n"); 344 status = -EFAULT; 345 goto err; 346 } 347 348 *levels = obj; 349 350 return 0; 351 352 err: 353 kfree(buffer.pointer); 354 355 return status; 356 } 357 358 static int 359 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 360 { 361 int status; 362 int state; 363 364 status = acpi_execute_simple_method(device->dev->handle, 365 "_BCM", level); 366 if (ACPI_FAILURE(status)) { 367 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed")); 368 return -EIO; 369 } 370 371 device->brightness->curr = level; 372 for (state = 2; state < device->brightness->count; state++) 373 if (level == device->brightness->levels[state]) { 374 if (device->backlight) 375 device->backlight->props.brightness = state - 2; 376 return 0; 377 } 378 379 ACPI_ERROR((AE_INFO, "Current brightness invalid")); 380 return -EINVAL; 381 } 382 383 /* 384 * For some buggy _BQC methods, we need to add a constant value to 385 * the _BQC return value to get the actual current brightness level 386 */ 387 388 static int bqc_offset_aml_bug_workaround; 389 static int video_set_bqc_offset(const struct dmi_system_id *d) 390 { 391 bqc_offset_aml_bug_workaround = 9; 392 return 0; 393 } 394 395 static int video_disable_backlight_sysfs_if( 396 const struct dmi_system_id *d) 397 { 398 if (disable_backlight_sysfs_if == -1) 399 disable_backlight_sysfs_if = 1; 400 return 0; 401 } 402 403 static int video_set_device_id_scheme(const struct dmi_system_id *d) 404 { 405 device_id_scheme = true; 406 return 0; 407 } 408 409 static int video_enable_only_lcd(const struct dmi_system_id *d) 410 { 411 only_lcd = true; 412 return 0; 413 } 414 415 static int video_set_report_key_events(const struct dmi_system_id *id) 416 { 417 if (report_key_events == -1) 418 report_key_events = (uintptr_t)id->driver_data; 419 return 0; 420 } 421 422 static 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 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 503 * but the IDs actually follow the Device ID Scheme. 504 */ 505 { 506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 507 .callback = video_set_device_id_scheme, 508 .ident = "ESPRIMO Mobile M9410", 509 .matches = { 510 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 511 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 512 }, 513 }, 514 /* 515 * Some machines have multiple video output devices, but only the one 516 * that is the type of LCD can do the backlight control so we should not 517 * register backlight interface for other video output devices. 518 */ 519 { 520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 521 .callback = video_enable_only_lcd, 522 .ident = "ESPRIMO Mobile M9410", 523 .matches = { 524 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 525 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 526 }, 527 }, 528 /* 529 * Some machines report wrong key events on the acpi-bus, suppress 530 * key event reporting on these. Note this is only intended to work 531 * around events which are plain wrong. In some cases we get double 532 * events, in this case acpi-video is considered the canonical source 533 * and the events from the other source should be filtered. E.g. 534 * by calling acpi_video_handles_brightness_key_presses() from the 535 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 536 */ 537 { 538 .callback = video_set_report_key_events, 539 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 540 .ident = "Dell Vostro V131", 541 .matches = { 542 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 543 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 544 }, 545 }, 546 {} 547 }; 548 549 static unsigned long long 550 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 551 unsigned long long bqc_value) 552 { 553 unsigned long long level; 554 555 if (device->brightness->flags._BQC_use_index) { 556 /* 557 * _BQC returns an index that doesn't account for 558 * the first 2 items with special meaning, so we need 559 * to compensate for that by offsetting ourselves 560 */ 561 if (device->brightness->flags._BCL_reversed) 562 bqc_value = device->brightness->count - 3 - bqc_value; 563 564 level = device->brightness->levels[bqc_value + 2]; 565 } else { 566 level = bqc_value; 567 } 568 569 level += bqc_offset_aml_bug_workaround; 570 571 return level; 572 } 573 574 static int 575 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 576 unsigned long long *level, bool raw) 577 { 578 acpi_status status = AE_OK; 579 int i; 580 581 if (device->cap._BQC || device->cap._BCQ) { 582 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 583 584 status = acpi_evaluate_integer(device->dev->handle, buf, 585 NULL, level); 586 if (ACPI_SUCCESS(status)) { 587 if (raw) { 588 /* 589 * Caller has indicated he wants the raw 590 * value returned by _BQC, so don't furtherly 591 * mess with the value. 592 */ 593 return 0; 594 } 595 596 *level = acpi_video_bqc_value_to_level(device, *level); 597 598 for (i = 2; i < device->brightness->count; i++) 599 if (device->brightness->levels[i] == *level) { 600 device->brightness->curr = *level; 601 return 0; 602 } 603 /* 604 * BQC returned an invalid level. 605 * Stop using it. 606 */ 607 ACPI_WARNING((AE_INFO, 608 "%s returned an invalid level", 609 buf)); 610 device->cap._BQC = device->cap._BCQ = 0; 611 } else { 612 /* 613 * Fixme: 614 * should we return an error or ignore this failure? 615 * dev->brightness->curr is a cached value which stores 616 * the correct current backlight level in most cases. 617 * ACPI video backlight still works w/ buggy _BQC. 618 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 619 */ 620 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf)); 621 device->cap._BQC = device->cap._BCQ = 0; 622 } 623 } 624 625 *level = device->brightness->curr; 626 return 0; 627 } 628 629 static int 630 acpi_video_device_EDID(struct acpi_video_device *device, 631 union acpi_object **edid, ssize_t length) 632 { 633 int status; 634 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 635 union acpi_object *obj; 636 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 637 struct acpi_object_list args = { 1, &arg0 }; 638 639 640 *edid = NULL; 641 642 if (!device) 643 return -ENODEV; 644 if (length == 128) 645 arg0.integer.value = 1; 646 else if (length == 256) 647 arg0.integer.value = 2; 648 else 649 return -EINVAL; 650 651 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 652 if (ACPI_FAILURE(status)) 653 return -ENODEV; 654 655 obj = buffer.pointer; 656 657 if (obj && obj->type == ACPI_TYPE_BUFFER) 658 *edid = obj; 659 else { 660 printk(KERN_ERR PREFIX "Invalid _DDC data\n"); 661 status = -EFAULT; 662 kfree(obj); 663 } 664 665 return status; 666 } 667 668 /* bus */ 669 670 /* 671 * Arg: 672 * video : video bus device pointer 673 * bios_flag : 674 * 0. The system BIOS should NOT automatically switch(toggle) 675 * the active display output. 676 * 1. The system BIOS should automatically switch (toggle) the 677 * active display output. No switch event. 678 * 2. The _DGS value should be locked. 679 * 3. The system BIOS should not automatically switch (toggle) the 680 * active display output, but instead generate the display switch 681 * event notify code. 682 * lcd_flag : 683 * 0. The system BIOS should automatically control the brightness level 684 * of the LCD when the power changes from AC to DC 685 * 1. The system BIOS should NOT automatically control the brightness 686 * level of the LCD when the power changes from AC to DC. 687 * Return Value: 688 * -EINVAL wrong arg. 689 */ 690 691 static int 692 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 693 { 694 acpi_status status; 695 696 if (!video->cap._DOS) 697 return 0; 698 699 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 700 return -EINVAL; 701 video->dos_setting = (lcd_flag << 2) | bios_flag; 702 status = acpi_execute_simple_method(video->device->handle, "_DOS", 703 (lcd_flag << 2) | bios_flag); 704 if (ACPI_FAILURE(status)) 705 return -EIO; 706 707 return 0; 708 } 709 710 /* 711 * Simple comparison function used to sort backlight levels. 712 */ 713 714 static int 715 acpi_video_cmp_level(const void *a, const void *b) 716 { 717 return *(int *)a - *(int *)b; 718 } 719 720 /* 721 * Decides if _BQC/_BCQ for this system is usable 722 * 723 * We do this by changing the level first and then read out the current 724 * brightness level, if the value does not match, find out if it is using 725 * index. If not, clear the _BQC/_BCQ capability. 726 */ 727 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 728 int max_level, int current_level) 729 { 730 struct acpi_video_device_brightness *br = device->brightness; 731 int result; 732 unsigned long long level; 733 int test_level; 734 735 /* don't mess with existing known broken systems */ 736 if (bqc_offset_aml_bug_workaround) 737 return 0; 738 739 /* 740 * Some systems always report current brightness level as maximum 741 * through _BQC, we need to test another value for them. 742 */ 743 test_level = current_level == max_level ? br->levels[3] : max_level; 744 745 result = acpi_video_device_lcd_set_level(device, test_level); 746 if (result) 747 return result; 748 749 result = acpi_video_device_lcd_get_level_current(device, &level, true); 750 if (result) 751 return result; 752 753 if (level != test_level) { 754 /* buggy _BQC found, need to find out if it uses index */ 755 if (level < br->count) { 756 if (br->flags._BCL_reversed) 757 level = br->count - 3 - level; 758 if (br->levels[level + 2] == test_level) 759 br->flags._BQC_use_index = 1; 760 } 761 762 if (!br->flags._BQC_use_index) 763 device->cap._BQC = device->cap._BCQ = 0; 764 } 765 766 return 0; 767 } 768 769 770 /* 771 * Arg: 772 * device : video output device (LCD, CRT, ..) 773 * 774 * Return Value: 775 * Maximum brightness level 776 * 777 * Allocate and initialize device->brightness. 778 */ 779 780 static int 781 acpi_video_init_brightness(struct acpi_video_device *device) 782 { 783 union acpi_object *obj = NULL; 784 int i, max_level = 0, count = 0, level_ac_battery = 0; 785 unsigned long long level, level_old; 786 union acpi_object *o; 787 struct acpi_video_device_brightness *br = NULL; 788 int result = -EINVAL; 789 u32 value; 790 791 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) { 792 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available " 793 "LCD brightness level\n")); 794 goto out; 795 } 796 797 if (obj->package.count < 2) 798 goto out; 799 800 br = kzalloc(sizeof(*br), GFP_KERNEL); 801 if (!br) { 802 printk(KERN_ERR "can't allocate memory\n"); 803 result = -ENOMEM; 804 goto out; 805 } 806 807 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels), 808 GFP_KERNEL); 809 if (!br->levels) { 810 result = -ENOMEM; 811 goto out_free; 812 } 813 814 for (i = 0; i < obj->package.count; i++) { 815 o = (union acpi_object *)&obj->package.elements[i]; 816 if (o->type != ACPI_TYPE_INTEGER) { 817 printk(KERN_ERR PREFIX "Invalid data\n"); 818 continue; 819 } 820 value = (u32) o->integer.value; 821 /* Skip duplicate entries */ 822 if (count > 2 && br->levels[count - 1] == value) 823 continue; 824 825 br->levels[count] = value; 826 827 if (br->levels[count] > max_level) 828 max_level = br->levels[count]; 829 count++; 830 } 831 832 /* 833 * some buggy BIOS don't export the levels 834 * when machine is on AC/Battery in _BCL package. 835 * In this case, the first two elements in _BCL packages 836 * are also supported brightness levels that OS should take care of. 837 */ 838 for (i = 2; i < count; i++) { 839 if (br->levels[i] == br->levels[0]) 840 level_ac_battery++; 841 if (br->levels[i] == br->levels[1]) 842 level_ac_battery++; 843 } 844 845 if (level_ac_battery < 2) { 846 level_ac_battery = 2 - level_ac_battery; 847 br->flags._BCL_no_ac_battery_levels = 1; 848 for (i = (count - 1 + level_ac_battery); i >= 2; i--) 849 br->levels[i] = br->levels[i - level_ac_battery]; 850 count += level_ac_battery; 851 } else if (level_ac_battery > 2) 852 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package")); 853 854 /* Check if the _BCL package is in a reversed order */ 855 if (max_level == br->levels[2]) { 856 br->flags._BCL_reversed = 1; 857 sort(&br->levels[2], count - 2, sizeof(br->levels[2]), 858 acpi_video_cmp_level, NULL); 859 } else if (max_level != br->levels[count - 1]) 860 ACPI_ERROR((AE_INFO, 861 "Found unordered _BCL package")); 862 863 br->count = count; 864 device->brightness = br; 865 866 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 867 br->curr = level = max_level; 868 869 if (!device->cap._BQC) 870 goto set_level; 871 872 result = acpi_video_device_lcd_get_level_current(device, 873 &level_old, true); 874 if (result) 875 goto out_free_levels; 876 877 result = acpi_video_bqc_quirk(device, max_level, level_old); 878 if (result) 879 goto out_free_levels; 880 /* 881 * cap._BQC may get cleared due to _BQC is found to be broken 882 * in acpi_video_bqc_quirk, so check again here. 883 */ 884 if (!device->cap._BQC) 885 goto set_level; 886 887 level = acpi_video_bqc_value_to_level(device, level_old); 888 /* 889 * On some buggy laptops, _BQC returns an uninitialized 890 * value when invoked for the first time, i.e. 891 * level_old is invalid (no matter whether it's a level 892 * or an index). Set the backlight to max_level in this case. 893 */ 894 for (i = 2; i < br->count; i++) 895 if (level == br->levels[i]) 896 break; 897 if (i == br->count || !level) 898 level = max_level; 899 900 set_level: 901 result = acpi_video_device_lcd_set_level(device, level); 902 if (result) 903 goto out_free_levels; 904 905 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 906 "found %d brightness levels\n", count - 2)); 907 kfree(obj); 908 return result; 909 910 out_free_levels: 911 kfree(br->levels); 912 out_free: 913 kfree(br); 914 out: 915 device->brightness = NULL; 916 kfree(obj); 917 return result; 918 } 919 920 /* 921 * Arg: 922 * device : video output device (LCD, CRT, ..) 923 * 924 * Return Value: 925 * None 926 * 927 * Find out all required AML methods defined under the output 928 * device. 929 */ 930 931 static void acpi_video_device_find_cap(struct acpi_video_device *device) 932 { 933 if (acpi_has_method(device->dev->handle, "_ADR")) 934 device->cap._ADR = 1; 935 if (acpi_has_method(device->dev->handle, "_BCL")) 936 device->cap._BCL = 1; 937 if (acpi_has_method(device->dev->handle, "_BCM")) 938 device->cap._BCM = 1; 939 if (acpi_has_method(device->dev->handle, "_BQC")) { 940 device->cap._BQC = 1; 941 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 942 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n"); 943 device->cap._BCQ = 1; 944 } 945 946 if (acpi_has_method(device->dev->handle, "_DDC")) 947 device->cap._DDC = 1; 948 } 949 950 /* 951 * Arg: 952 * device : video output device (VGA) 953 * 954 * Return Value: 955 * None 956 * 957 * Find out all required AML methods defined under the video bus device. 958 */ 959 960 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 961 { 962 if (acpi_has_method(video->device->handle, "_DOS")) 963 video->cap._DOS = 1; 964 if (acpi_has_method(video->device->handle, "_DOD")) 965 video->cap._DOD = 1; 966 if (acpi_has_method(video->device->handle, "_ROM")) 967 video->cap._ROM = 1; 968 if (acpi_has_method(video->device->handle, "_GPD")) 969 video->cap._GPD = 1; 970 if (acpi_has_method(video->device->handle, "_SPD")) 971 video->cap._SPD = 1; 972 if (acpi_has_method(video->device->handle, "_VPO")) 973 video->cap._VPO = 1; 974 } 975 976 /* 977 * Check whether the video bus device has required AML method to 978 * support the desired features 979 */ 980 981 static int acpi_video_bus_check(struct acpi_video_bus *video) 982 { 983 acpi_status status = -ENOENT; 984 struct pci_dev *dev; 985 986 if (!video) 987 return -EINVAL; 988 989 dev = acpi_get_pci_dev(video->device->handle); 990 if (!dev) 991 return -ENODEV; 992 pci_dev_put(dev); 993 994 /* 995 * Since there is no HID, CID and so on for VGA driver, we have 996 * to check well known required nodes. 997 */ 998 999 /* Does this device support video switching? */ 1000 if (video->cap._DOS || video->cap._DOD) { 1001 if (!video->cap._DOS) { 1002 printk(KERN_WARNING FW_BUG 1003 "ACPI(%s) defines _DOD but not _DOS\n", 1004 acpi_device_bid(video->device)); 1005 } 1006 video->flags.multihead = 1; 1007 status = 0; 1008 } 1009 1010 /* Does this device support retrieving a video ROM? */ 1011 if (video->cap._ROM) { 1012 video->flags.rom = 1; 1013 status = 0; 1014 } 1015 1016 /* Does this device support configuring which video device to POST? */ 1017 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1018 video->flags.post = 1; 1019 status = 0; 1020 } 1021 1022 return status; 1023 } 1024 1025 /* 1026 * -------------------------------------------------------------------------- 1027 * Driver Interface 1028 * -------------------------------------------------------------------------- 1029 */ 1030 1031 /* device interface */ 1032 static struct acpi_video_device_attrib * 1033 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1034 { 1035 struct acpi_video_enumerated_device *ids; 1036 int i; 1037 1038 for (i = 0; i < video->attached_count; i++) { 1039 ids = &video->attached_array[i]; 1040 if ((ids->value.int_val & 0xffff) == device_id) 1041 return &ids->value.attrib; 1042 } 1043 1044 return NULL; 1045 } 1046 1047 static int 1048 acpi_video_get_device_type(struct acpi_video_bus *video, 1049 unsigned long device_id) 1050 { 1051 struct acpi_video_enumerated_device *ids; 1052 int i; 1053 1054 for (i = 0; i < video->attached_count; i++) { 1055 ids = &video->attached_array[i]; 1056 if ((ids->value.int_val & 0xffff) == device_id) 1057 return ids->value.int_val; 1058 } 1059 1060 return 0; 1061 } 1062 1063 static int 1064 acpi_video_bus_get_one_device(struct acpi_device *device, 1065 struct acpi_video_bus *video) 1066 { 1067 unsigned long long device_id; 1068 int status, device_type; 1069 struct acpi_video_device *data; 1070 struct acpi_video_device_attrib *attribute; 1071 1072 status = 1073 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1074 /* Some device omits _ADR, we skip them instead of fail */ 1075 if (ACPI_FAILURE(status)) 1076 return 0; 1077 1078 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1079 if (!data) 1080 return -ENOMEM; 1081 1082 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1083 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1084 device->driver_data = data; 1085 1086 data->device_id = device_id; 1087 data->video = video; 1088 data->dev = device; 1089 INIT_DELAYED_WORK(&data->switch_brightness_work, 1090 acpi_video_switch_brightness); 1091 1092 attribute = acpi_video_get_device_attr(video, device_id); 1093 1094 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1095 switch (attribute->display_type) { 1096 case ACPI_VIDEO_DISPLAY_CRT: 1097 data->flags.crt = 1; 1098 break; 1099 case ACPI_VIDEO_DISPLAY_TV: 1100 data->flags.tvout = 1; 1101 break; 1102 case ACPI_VIDEO_DISPLAY_DVI: 1103 data->flags.dvi = 1; 1104 break; 1105 case ACPI_VIDEO_DISPLAY_LCD: 1106 data->flags.lcd = 1; 1107 break; 1108 default: 1109 data->flags.unknown = 1; 1110 break; 1111 } 1112 if (attribute->bios_can_detect) 1113 data->flags.bios = 1; 1114 } else { 1115 /* Check for legacy IDs */ 1116 device_type = acpi_video_get_device_type(video, device_id); 1117 /* Ignore bits 16 and 18-20 */ 1118 switch (device_type & 0xffe2ffff) { 1119 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1120 data->flags.crt = 1; 1121 break; 1122 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1123 data->flags.lcd = 1; 1124 break; 1125 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1126 data->flags.tvout = 1; 1127 break; 1128 default: 1129 data->flags.unknown = 1; 1130 } 1131 } 1132 1133 acpi_video_device_bind(video, data); 1134 acpi_video_device_find_cap(data); 1135 1136 mutex_lock(&video->device_list_lock); 1137 list_add_tail(&data->entry, &video->video_device_list); 1138 mutex_unlock(&video->device_list_lock); 1139 1140 return status; 1141 } 1142 1143 /* 1144 * Arg: 1145 * video : video bus device 1146 * 1147 * Return: 1148 * none 1149 * 1150 * Enumerate the video device list of the video bus, 1151 * bind the ids with the corresponding video devices 1152 * under the video bus. 1153 */ 1154 1155 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1156 { 1157 struct acpi_video_device *dev; 1158 1159 mutex_lock(&video->device_list_lock); 1160 1161 list_for_each_entry(dev, &video->video_device_list, entry) 1162 acpi_video_device_bind(video, dev); 1163 1164 mutex_unlock(&video->device_list_lock); 1165 } 1166 1167 /* 1168 * Arg: 1169 * video : video bus device 1170 * device : video output device under the video 1171 * bus 1172 * 1173 * Return: 1174 * none 1175 * 1176 * Bind the ids with the corresponding video devices 1177 * under the video bus. 1178 */ 1179 1180 static void 1181 acpi_video_device_bind(struct acpi_video_bus *video, 1182 struct acpi_video_device *device) 1183 { 1184 struct acpi_video_enumerated_device *ids; 1185 int i; 1186 1187 for (i = 0; i < video->attached_count; i++) { 1188 ids = &video->attached_array[i]; 1189 if (device->device_id == (ids->value.int_val & 0xffff)) { 1190 ids->bind_info = device; 1191 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i)); 1192 } 1193 } 1194 } 1195 1196 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1197 { 1198 struct acpi_video_bus *video = device->video; 1199 int i; 1200 1201 /* 1202 * If we have a broken _DOD or we have more than 8 output devices 1203 * under the graphics controller node that we can't proper deal with 1204 * in the operation region code currently, no need to test. 1205 */ 1206 if (!video->attached_count || video->child_count > 8) 1207 return true; 1208 1209 for (i = 0; i < video->attached_count; i++) { 1210 if ((video->attached_array[i].value.int_val & 0xfff) == 1211 (device->device_id & 0xfff)) 1212 return true; 1213 } 1214 1215 return false; 1216 } 1217 1218 /* 1219 * Arg: 1220 * video : video bus device 1221 * 1222 * Return: 1223 * < 0 : error 1224 * 1225 * Call _DOD to enumerate all devices attached to display adapter 1226 * 1227 */ 1228 1229 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1230 { 1231 int status; 1232 int count; 1233 int i; 1234 struct acpi_video_enumerated_device *active_list; 1235 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1236 union acpi_object *dod = NULL; 1237 union acpi_object *obj; 1238 1239 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1240 if (!ACPI_SUCCESS(status)) { 1241 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD")); 1242 return status; 1243 } 1244 1245 dod = buffer.pointer; 1246 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1247 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data")); 1248 status = -EFAULT; 1249 goto out; 1250 } 1251 1252 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n", 1253 dod->package.count)); 1254 1255 active_list = kcalloc(1 + dod->package.count, 1256 sizeof(struct acpi_video_enumerated_device), 1257 GFP_KERNEL); 1258 if (!active_list) { 1259 status = -ENOMEM; 1260 goto out; 1261 } 1262 1263 count = 0; 1264 for (i = 0; i < dod->package.count; i++) { 1265 obj = &dod->package.elements[i]; 1266 1267 if (obj->type != ACPI_TYPE_INTEGER) { 1268 printk(KERN_ERR PREFIX 1269 "Invalid _DOD data in element %d\n", i); 1270 continue; 1271 } 1272 1273 active_list[count].value.int_val = obj->integer.value; 1274 active_list[count].bind_info = NULL; 1275 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, 1276 (int)obj->integer.value)); 1277 count++; 1278 } 1279 1280 kfree(video->attached_array); 1281 1282 video->attached_array = active_list; 1283 video->attached_count = count; 1284 1285 out: 1286 kfree(buffer.pointer); 1287 return status; 1288 } 1289 1290 static int 1291 acpi_video_get_next_level(struct acpi_video_device *device, 1292 u32 level_current, u32 event) 1293 { 1294 int min, max, min_above, max_below, i, l, delta = 255; 1295 max = max_below = 0; 1296 min = min_above = 255; 1297 /* Find closest level to level_current */ 1298 for (i = 2; i < device->brightness->count; i++) { 1299 l = device->brightness->levels[i]; 1300 if (abs(l - level_current) < abs(delta)) { 1301 delta = l - level_current; 1302 if (!delta) 1303 break; 1304 } 1305 } 1306 /* Ajust level_current to closest available level */ 1307 level_current += delta; 1308 for (i = 2; i < device->brightness->count; i++) { 1309 l = device->brightness->levels[i]; 1310 if (l < min) 1311 min = l; 1312 if (l > max) 1313 max = l; 1314 if (l < min_above && l > level_current) 1315 min_above = l; 1316 if (l > max_below && l < level_current) 1317 max_below = l; 1318 } 1319 1320 switch (event) { 1321 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1322 return (level_current < max) ? min_above : min; 1323 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1324 return (level_current < max) ? min_above : max; 1325 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1326 return (level_current > min) ? max_below : min; 1327 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1328 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1329 return 0; 1330 default: 1331 return level_current; 1332 } 1333 } 1334 1335 static void 1336 acpi_video_switch_brightness(struct work_struct *work) 1337 { 1338 struct acpi_video_device *device = container_of(to_delayed_work(work), 1339 struct acpi_video_device, switch_brightness_work); 1340 unsigned long long level_current, level_next; 1341 int event = device->switch_brightness_event; 1342 int result = -EINVAL; 1343 1344 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1345 if (!device->backlight) 1346 return; 1347 1348 if (!device->brightness) 1349 goto out; 1350 1351 result = acpi_video_device_lcd_get_level_current(device, 1352 &level_current, 1353 false); 1354 if (result) 1355 goto out; 1356 1357 level_next = acpi_video_get_next_level(device, level_current, event); 1358 1359 result = acpi_video_device_lcd_set_level(device, level_next); 1360 1361 if (!result) 1362 backlight_force_update(device->backlight, 1363 BACKLIGHT_UPDATE_HOTKEY); 1364 1365 out: 1366 if (result) 1367 printk(KERN_ERR PREFIX "Failed to switch the brightness\n"); 1368 } 1369 1370 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1371 void **edid) 1372 { 1373 struct acpi_video_bus *video; 1374 struct acpi_video_device *video_device; 1375 union acpi_object *buffer = NULL; 1376 acpi_status status; 1377 int i, length; 1378 1379 if (!device || !acpi_driver_data(device)) 1380 return -EINVAL; 1381 1382 video = acpi_driver_data(device); 1383 1384 for (i = 0; i < video->attached_count; i++) { 1385 video_device = video->attached_array[i].bind_info; 1386 length = 256; 1387 1388 if (!video_device) 1389 continue; 1390 1391 if (!video_device->cap._DDC) 1392 continue; 1393 1394 if (type) { 1395 switch (type) { 1396 case ACPI_VIDEO_DISPLAY_CRT: 1397 if (!video_device->flags.crt) 1398 continue; 1399 break; 1400 case ACPI_VIDEO_DISPLAY_TV: 1401 if (!video_device->flags.tvout) 1402 continue; 1403 break; 1404 case ACPI_VIDEO_DISPLAY_DVI: 1405 if (!video_device->flags.dvi) 1406 continue; 1407 break; 1408 case ACPI_VIDEO_DISPLAY_LCD: 1409 if (!video_device->flags.lcd) 1410 continue; 1411 break; 1412 } 1413 } else if (video_device->device_id != device_id) { 1414 continue; 1415 } 1416 1417 status = acpi_video_device_EDID(video_device, &buffer, length); 1418 1419 if (ACPI_FAILURE(status) || !buffer || 1420 buffer->type != ACPI_TYPE_BUFFER) { 1421 length = 128; 1422 status = acpi_video_device_EDID(video_device, &buffer, 1423 length); 1424 if (ACPI_FAILURE(status) || !buffer || 1425 buffer->type != ACPI_TYPE_BUFFER) { 1426 continue; 1427 } 1428 } 1429 1430 *edid = buffer->buffer.pointer; 1431 return length; 1432 } 1433 1434 return -ENODEV; 1435 } 1436 EXPORT_SYMBOL(acpi_video_get_edid); 1437 1438 static int 1439 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1440 struct acpi_device *device) 1441 { 1442 int status = 0; 1443 struct acpi_device *dev; 1444 1445 /* 1446 * There are systems where video module known to work fine regardless 1447 * of broken _DOD and ignoring returned value here doesn't cause 1448 * any issues later. 1449 */ 1450 acpi_video_device_enumerate(video); 1451 1452 list_for_each_entry(dev, &device->children, node) { 1453 1454 status = acpi_video_bus_get_one_device(dev, video); 1455 if (status) { 1456 dev_err(&dev->dev, "Can't attach device\n"); 1457 break; 1458 } 1459 video->child_count++; 1460 } 1461 return status; 1462 } 1463 1464 /* acpi_video interface */ 1465 1466 /* 1467 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1468 * preform any automatic brightness change on receiving a notification. 1469 */ 1470 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1471 { 1472 return acpi_video_bus_DOS(video, 0, 1473 acpi_osi_is_win8() ? 1 : 0); 1474 } 1475 1476 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1477 { 1478 return acpi_video_bus_DOS(video, 0, 1479 acpi_osi_is_win8() ? 0 : 1); 1480 } 1481 1482 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1483 { 1484 struct acpi_video_bus *video = acpi_driver_data(device); 1485 struct input_dev *input; 1486 int keycode = 0; 1487 1488 if (!video || !video->input) 1489 return; 1490 1491 input = video->input; 1492 1493 switch (event) { 1494 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1495 * most likely via hotkey. */ 1496 keycode = KEY_SWITCHVIDEOMODE; 1497 break; 1498 1499 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1500 * connector. */ 1501 acpi_video_device_enumerate(video); 1502 acpi_video_device_rebind(video); 1503 keycode = KEY_SWITCHVIDEOMODE; 1504 break; 1505 1506 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1507 keycode = KEY_SWITCHVIDEOMODE; 1508 break; 1509 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1510 keycode = KEY_VIDEO_NEXT; 1511 break; 1512 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1513 keycode = KEY_VIDEO_PREV; 1514 break; 1515 1516 default: 1517 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1518 "Unsupported event [0x%x]\n", event)); 1519 break; 1520 } 1521 1522 if (acpi_notifier_call_chain(device, event, 0)) 1523 /* Something vetoed the keypress. */ 1524 keycode = 0; 1525 1526 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1527 input_report_key(input, keycode, 1); 1528 input_sync(input); 1529 input_report_key(input, keycode, 0); 1530 input_sync(input); 1531 } 1532 1533 return; 1534 } 1535 1536 static void brightness_switch_event(struct acpi_video_device *video_device, 1537 u32 event) 1538 { 1539 if (!brightness_switch_enabled) 1540 return; 1541 1542 video_device->switch_brightness_event = event; 1543 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1544 } 1545 1546 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1547 { 1548 struct acpi_video_device *video_device = data; 1549 struct acpi_device *device = NULL; 1550 struct acpi_video_bus *bus; 1551 struct input_dev *input; 1552 int keycode = 0; 1553 1554 if (!video_device) 1555 return; 1556 1557 device = video_device->dev; 1558 bus = video_device->video; 1559 input = bus->input; 1560 1561 switch (event) { 1562 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1563 brightness_switch_event(video_device, event); 1564 keycode = KEY_BRIGHTNESS_CYCLE; 1565 break; 1566 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1567 brightness_switch_event(video_device, event); 1568 keycode = KEY_BRIGHTNESSUP; 1569 break; 1570 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1571 brightness_switch_event(video_device, event); 1572 keycode = KEY_BRIGHTNESSDOWN; 1573 break; 1574 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1575 brightness_switch_event(video_device, event); 1576 keycode = KEY_BRIGHTNESS_ZERO; 1577 break; 1578 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1579 brightness_switch_event(video_device, event); 1580 keycode = KEY_DISPLAY_OFF; 1581 break; 1582 default: 1583 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1584 "Unsupported event [0x%x]\n", event)); 1585 break; 1586 } 1587 1588 acpi_notifier_call_chain(device, event, 0); 1589 1590 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1591 input_report_key(input, keycode, 1); 1592 input_sync(input); 1593 input_report_key(input, keycode, 0); 1594 input_sync(input); 1595 } 1596 1597 return; 1598 } 1599 1600 static int acpi_video_resume(struct notifier_block *nb, 1601 unsigned long val, void *ign) 1602 { 1603 struct acpi_video_bus *video; 1604 struct acpi_video_device *video_device; 1605 int i; 1606 1607 switch (val) { 1608 case PM_HIBERNATION_PREPARE: 1609 case PM_SUSPEND_PREPARE: 1610 case PM_RESTORE_PREPARE: 1611 return NOTIFY_DONE; 1612 } 1613 1614 video = container_of(nb, struct acpi_video_bus, pm_nb); 1615 1616 dev_info(&video->device->dev, "Restoring backlight state\n"); 1617 1618 for (i = 0; i < video->attached_count; i++) { 1619 video_device = video->attached_array[i].bind_info; 1620 if (video_device && video_device->brightness) 1621 acpi_video_device_lcd_set_level(video_device, 1622 video_device->brightness->curr); 1623 } 1624 1625 return NOTIFY_OK; 1626 } 1627 1628 static acpi_status 1629 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1630 void **return_value) 1631 { 1632 struct acpi_device *device = context; 1633 struct acpi_device *sibling; 1634 int result; 1635 1636 if (handle == device->handle) 1637 return AE_CTRL_TERMINATE; 1638 1639 result = acpi_bus_get_device(handle, &sibling); 1640 if (result) 1641 return AE_OK; 1642 1643 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1644 return AE_ALREADY_EXISTS; 1645 1646 return AE_OK; 1647 } 1648 1649 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1650 { 1651 struct backlight_properties props; 1652 struct pci_dev *pdev; 1653 acpi_handle acpi_parent; 1654 struct device *parent = NULL; 1655 int result; 1656 static int count; 1657 char *name; 1658 1659 result = acpi_video_init_brightness(device); 1660 if (result) 1661 return; 1662 1663 if (disable_backlight_sysfs_if > 0) 1664 return; 1665 1666 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1667 if (!name) 1668 return; 1669 count++; 1670 1671 acpi_get_parent(device->dev->handle, &acpi_parent); 1672 1673 pdev = acpi_get_pci_dev(acpi_parent); 1674 if (pdev) { 1675 parent = &pdev->dev; 1676 pci_dev_put(pdev); 1677 } 1678 1679 memset(&props, 0, sizeof(struct backlight_properties)); 1680 props.type = BACKLIGHT_FIRMWARE; 1681 props.max_brightness = device->brightness->count - 3; 1682 device->backlight = backlight_device_register(name, 1683 parent, 1684 device, 1685 &acpi_backlight_ops, 1686 &props); 1687 kfree(name); 1688 if (IS_ERR(device->backlight)) { 1689 device->backlight = NULL; 1690 return; 1691 } 1692 1693 /* 1694 * Save current brightness level in case we have to restore it 1695 * before acpi_video_device_lcd_set_level() is called next time. 1696 */ 1697 device->backlight->props.brightness = 1698 acpi_video_get_brightness(device->backlight); 1699 1700 device->cooling_dev = thermal_cooling_device_register("LCD", 1701 device->dev, &video_cooling_ops); 1702 if (IS_ERR(device->cooling_dev)) { 1703 /* 1704 * Set cooling_dev to NULL so we don't crash trying to free it. 1705 * Also, why the hell we are returning early and not attempt to 1706 * register video output if cooling device registration failed? 1707 * -- dtor 1708 */ 1709 device->cooling_dev = NULL; 1710 return; 1711 } 1712 1713 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1714 device->cooling_dev->id); 1715 result = sysfs_create_link(&device->dev->dev.kobj, 1716 &device->cooling_dev->device.kobj, 1717 "thermal_cooling"); 1718 if (result) 1719 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1720 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1721 &device->dev->dev.kobj, "device"); 1722 if (result) 1723 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1724 } 1725 1726 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1727 { 1728 struct acpi_video_device *dev; 1729 union acpi_object *levels; 1730 1731 mutex_lock(&video->device_list_lock); 1732 list_for_each_entry(dev, &video->video_device_list, entry) { 1733 if (!acpi_video_device_lcd_query_levels(dev, &levels)) 1734 kfree(levels); 1735 } 1736 mutex_unlock(&video->device_list_lock); 1737 } 1738 1739 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1740 { 1741 /* 1742 * Do not create backlight device for video output 1743 * device that is not in the enumerated list. 1744 */ 1745 if (!acpi_video_device_in_dod(dev)) { 1746 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1747 return false; 1748 } 1749 1750 if (only_lcd) 1751 return dev->flags.lcd; 1752 return true; 1753 } 1754 1755 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1756 { 1757 struct acpi_video_device *dev; 1758 1759 if (video->backlight_registered) 1760 return 0; 1761 1762 acpi_video_run_bcl_for_osi(video); 1763 1764 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1765 return 0; 1766 1767 mutex_lock(&video->device_list_lock); 1768 list_for_each_entry(dev, &video->video_device_list, entry) { 1769 if (acpi_video_should_register_backlight(dev)) 1770 acpi_video_dev_register_backlight(dev); 1771 } 1772 mutex_unlock(&video->device_list_lock); 1773 1774 video->backlight_registered = true; 1775 1776 video->pm_nb.notifier_call = acpi_video_resume; 1777 video->pm_nb.priority = 0; 1778 return register_pm_notifier(&video->pm_nb); 1779 } 1780 1781 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1782 { 1783 if (device->backlight) { 1784 backlight_device_unregister(device->backlight); 1785 device->backlight = NULL; 1786 } 1787 if (device->brightness) { 1788 kfree(device->brightness->levels); 1789 kfree(device->brightness); 1790 device->brightness = NULL; 1791 } 1792 if (device->cooling_dev) { 1793 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1794 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1795 thermal_cooling_device_unregister(device->cooling_dev); 1796 device->cooling_dev = NULL; 1797 } 1798 } 1799 1800 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1801 { 1802 struct acpi_video_device *dev; 1803 int error; 1804 1805 if (!video->backlight_registered) 1806 return 0; 1807 1808 error = unregister_pm_notifier(&video->pm_nb); 1809 1810 mutex_lock(&video->device_list_lock); 1811 list_for_each_entry(dev, &video->video_device_list, entry) 1812 acpi_video_dev_unregister_backlight(dev); 1813 mutex_unlock(&video->device_list_lock); 1814 1815 video->backlight_registered = false; 1816 1817 return error; 1818 } 1819 1820 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1821 { 1822 acpi_status status; 1823 struct acpi_device *adev = device->dev; 1824 1825 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1826 acpi_video_device_notify, device); 1827 if (ACPI_FAILURE(status)) 1828 dev_err(&adev->dev, "Error installing notify handler\n"); 1829 else 1830 device->flags.notify = 1; 1831 } 1832 1833 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1834 { 1835 struct input_dev *input; 1836 struct acpi_video_device *dev; 1837 int error; 1838 1839 video->input = input = input_allocate_device(); 1840 if (!input) { 1841 error = -ENOMEM; 1842 goto out; 1843 } 1844 1845 error = acpi_video_bus_start_devices(video); 1846 if (error) 1847 goto err_free_input; 1848 1849 snprintf(video->phys, sizeof(video->phys), 1850 "%s/video/input0", acpi_device_hid(video->device)); 1851 1852 input->name = acpi_device_name(video->device); 1853 input->phys = video->phys; 1854 input->id.bustype = BUS_HOST; 1855 input->id.product = 0x06; 1856 input->dev.parent = &video->device->dev; 1857 input->evbit[0] = BIT(EV_KEY); 1858 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1859 set_bit(KEY_VIDEO_NEXT, input->keybit); 1860 set_bit(KEY_VIDEO_PREV, input->keybit); 1861 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1862 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1863 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1864 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1865 set_bit(KEY_DISPLAY_OFF, input->keybit); 1866 1867 error = input_register_device(input); 1868 if (error) 1869 goto err_stop_dev; 1870 1871 mutex_lock(&video->device_list_lock); 1872 list_for_each_entry(dev, &video->video_device_list, entry) 1873 acpi_video_dev_add_notify_handler(dev); 1874 mutex_unlock(&video->device_list_lock); 1875 1876 return 0; 1877 1878 err_stop_dev: 1879 acpi_video_bus_stop_devices(video); 1880 err_free_input: 1881 input_free_device(input); 1882 video->input = NULL; 1883 out: 1884 return error; 1885 } 1886 1887 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1888 { 1889 if (dev->flags.notify) { 1890 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1891 acpi_video_device_notify); 1892 dev->flags.notify = 0; 1893 } 1894 } 1895 1896 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1897 { 1898 struct acpi_video_device *dev; 1899 1900 mutex_lock(&video->device_list_lock); 1901 list_for_each_entry(dev, &video->video_device_list, entry) 1902 acpi_video_dev_remove_notify_handler(dev); 1903 mutex_unlock(&video->device_list_lock); 1904 1905 acpi_video_bus_stop_devices(video); 1906 input_unregister_device(video->input); 1907 video->input = NULL; 1908 } 1909 1910 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1911 { 1912 struct acpi_video_device *dev, *next; 1913 1914 mutex_lock(&video->device_list_lock); 1915 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1916 list_del(&dev->entry); 1917 kfree(dev); 1918 } 1919 mutex_unlock(&video->device_list_lock); 1920 1921 return 0; 1922 } 1923 1924 static int instance; 1925 1926 static int acpi_video_bus_add(struct acpi_device *device) 1927 { 1928 struct acpi_video_bus *video; 1929 int error; 1930 acpi_status status; 1931 1932 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1933 device->parent->handle, 1, 1934 acpi_video_bus_match, NULL, 1935 device, NULL); 1936 if (status == AE_ALREADY_EXISTS) { 1937 printk(KERN_WARNING FW_BUG 1938 "Duplicate ACPI video bus devices for the" 1939 " same VGA controller, please try module " 1940 "parameter \"video.allow_duplicates=1\"" 1941 "if the current driver doesn't work.\n"); 1942 if (!allow_duplicates) 1943 return -ENODEV; 1944 } 1945 1946 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 1947 if (!video) 1948 return -ENOMEM; 1949 1950 /* a hack to fix the duplicate name "VID" problem on T61 */ 1951 if (!strcmp(device->pnp.bus_id, "VID")) { 1952 if (instance) 1953 device->pnp.bus_id[3] = '0' + instance; 1954 instance++; 1955 } 1956 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 1957 if (!strcmp(device->pnp.bus_id, "VGA")) { 1958 if (instance) 1959 device->pnp.bus_id[3] = '0' + instance; 1960 instance++; 1961 } 1962 1963 video->device = device; 1964 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 1965 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1966 device->driver_data = video; 1967 1968 acpi_video_bus_find_cap(video); 1969 error = acpi_video_bus_check(video); 1970 if (error) 1971 goto err_free_video; 1972 1973 mutex_init(&video->device_list_lock); 1974 INIT_LIST_HEAD(&video->video_device_list); 1975 1976 error = acpi_video_bus_get_devices(video, device); 1977 if (error) 1978 goto err_put_video; 1979 1980 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n", 1981 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 1982 video->flags.multihead ? "yes" : "no", 1983 video->flags.rom ? "yes" : "no", 1984 video->flags.post ? "yes" : "no"); 1985 mutex_lock(&video_list_lock); 1986 list_add_tail(&video->entry, &video_bus_head); 1987 mutex_unlock(&video_list_lock); 1988 1989 acpi_video_bus_register_backlight(video); 1990 acpi_video_bus_add_notify_handler(video); 1991 1992 return 0; 1993 1994 err_put_video: 1995 acpi_video_bus_put_devices(video); 1996 kfree(video->attached_array); 1997 err_free_video: 1998 kfree(video); 1999 device->driver_data = NULL; 2000 2001 return error; 2002 } 2003 2004 static int acpi_video_bus_remove(struct acpi_device *device) 2005 { 2006 struct acpi_video_bus *video = NULL; 2007 2008 2009 if (!device || !acpi_driver_data(device)) 2010 return -EINVAL; 2011 2012 video = acpi_driver_data(device); 2013 2014 acpi_video_bus_remove_notify_handler(video); 2015 acpi_video_bus_unregister_backlight(video); 2016 acpi_video_bus_put_devices(video); 2017 2018 mutex_lock(&video_list_lock); 2019 list_del(&video->entry); 2020 mutex_unlock(&video_list_lock); 2021 2022 kfree(video->attached_array); 2023 kfree(video); 2024 2025 return 0; 2026 } 2027 2028 static int __init is_i740(struct pci_dev *dev) 2029 { 2030 if (dev->device == 0x00D1) 2031 return 1; 2032 if (dev->device == 0x7000) 2033 return 1; 2034 return 0; 2035 } 2036 2037 static int __init intel_opregion_present(void) 2038 { 2039 int opregion = 0; 2040 struct pci_dev *dev = NULL; 2041 u32 address; 2042 2043 for_each_pci_dev(dev) { 2044 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2045 continue; 2046 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2047 continue; 2048 /* We don't want to poke around undefined i740 registers */ 2049 if (is_i740(dev)) 2050 continue; 2051 pci_read_config_dword(dev, 0xfc, &address); 2052 if (!address) 2053 continue; 2054 opregion = 1; 2055 } 2056 return opregion; 2057 } 2058 2059 int acpi_video_register(void) 2060 { 2061 int ret = 0; 2062 2063 mutex_lock(®ister_count_mutex); 2064 if (register_count) { 2065 /* 2066 * if the function of acpi_video_register is already called, 2067 * don't register the acpi_vide_bus again and return no error. 2068 */ 2069 goto leave; 2070 } 2071 2072 dmi_check_system(video_dmi_table); 2073 2074 ret = acpi_bus_register_driver(&acpi_video_bus); 2075 if (ret) 2076 goto leave; 2077 2078 /* 2079 * When the acpi_video_bus is loaded successfully, increase 2080 * the counter reference. 2081 */ 2082 register_count = 1; 2083 2084 leave: 2085 mutex_unlock(®ister_count_mutex); 2086 return ret; 2087 } 2088 EXPORT_SYMBOL(acpi_video_register); 2089 2090 void acpi_video_unregister(void) 2091 { 2092 mutex_lock(®ister_count_mutex); 2093 if (register_count) { 2094 acpi_bus_unregister_driver(&acpi_video_bus); 2095 register_count = 0; 2096 } 2097 mutex_unlock(®ister_count_mutex); 2098 } 2099 EXPORT_SYMBOL(acpi_video_unregister); 2100 2101 void acpi_video_unregister_backlight(void) 2102 { 2103 struct acpi_video_bus *video; 2104 2105 mutex_lock(®ister_count_mutex); 2106 if (register_count) { 2107 mutex_lock(&video_list_lock); 2108 list_for_each_entry(video, &video_bus_head, entry) 2109 acpi_video_bus_unregister_backlight(video); 2110 mutex_unlock(&video_list_lock); 2111 } 2112 mutex_unlock(®ister_count_mutex); 2113 } 2114 2115 bool acpi_video_handles_brightness_key_presses(void) 2116 { 2117 bool have_video_busses; 2118 2119 mutex_lock(&video_list_lock); 2120 have_video_busses = !list_empty(&video_bus_head); 2121 mutex_unlock(&video_list_lock); 2122 2123 return have_video_busses && 2124 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2125 } 2126 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2127 2128 /* 2129 * This is kind of nasty. Hardware using Intel chipsets may require 2130 * the video opregion code to be run first in order to initialise 2131 * state before any ACPI video calls are made. To handle this we defer 2132 * registration of the video class until the opregion code has run. 2133 */ 2134 2135 static int __init acpi_video_init(void) 2136 { 2137 /* 2138 * Let the module load even if ACPI is disabled (e.g. due to 2139 * a broken BIOS) so that i915.ko can still be loaded on such 2140 * old systems without an AcpiOpRegion. 2141 * 2142 * acpi_video_register() will report -ENODEV later as well due 2143 * to acpi_disabled when i915.ko tries to register itself afterwards. 2144 */ 2145 if (acpi_disabled) 2146 return 0; 2147 2148 if (intel_opregion_present()) 2149 return 0; 2150 2151 return acpi_video_register(); 2152 } 2153 2154 static void __exit acpi_video_exit(void) 2155 { 2156 acpi_video_detect_exit(); 2157 acpi_video_unregister(); 2158 2159 return; 2160 } 2161 2162 module_init(acpi_video_init); 2163 module_exit(acpi_video_exit); 2164