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