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 = true; 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 int only_lcd = -1; 84 module_param(only_lcd, int, 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 const 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_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 836 sizeof(*br->levels), 837 GFP_KERNEL); 838 if (!br->levels) { 839 result = -ENOMEM; 840 goto out_free; 841 } 842 843 for (i = 0; i < obj->package.count; i++) { 844 o = (union acpi_object *)&obj->package.elements[i]; 845 if (o->type != ACPI_TYPE_INTEGER) { 846 printk(KERN_ERR PREFIX "Invalid data\n"); 847 continue; 848 } 849 value = (u32) o->integer.value; 850 /* Skip duplicate entries */ 851 if (count > ACPI_VIDEO_FIRST_LEVEL 852 && br->levels[count - 1] == value) 853 continue; 854 855 br->levels[count] = value; 856 857 if (br->levels[count] > max_level) 858 max_level = br->levels[count]; 859 count++; 860 } 861 862 /* 863 * some buggy BIOS don't export the levels 864 * when machine is on AC/Battery in _BCL package. 865 * In this case, the first two elements in _BCL packages 866 * are also supported brightness levels that OS should take care of. 867 */ 868 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 869 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 870 level_ac_battery++; 871 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 872 level_ac_battery++; 873 } 874 875 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 876 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 877 br->flags._BCL_no_ac_battery_levels = 1; 878 for (i = (count - 1 + level_ac_battery); 879 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 880 br->levels[i] = br->levels[i - level_ac_battery]; 881 count += level_ac_battery; 882 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 883 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package")); 884 885 /* Check if the _BCL package is in a reversed order */ 886 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 887 br->flags._BCL_reversed = 1; 888 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 889 count - ACPI_VIDEO_FIRST_LEVEL, 890 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 891 acpi_video_cmp_level, NULL); 892 } else if (max_level != br->levels[count - 1]) 893 ACPI_ERROR((AE_INFO, 894 "Found unordered _BCL package")); 895 896 br->count = count; 897 *dev_br = br; 898 if (pmax_level) 899 *pmax_level = max_level; 900 901 out: 902 kfree(obj); 903 return result; 904 out_free: 905 kfree(br); 906 goto out; 907 } 908 EXPORT_SYMBOL(acpi_video_get_levels); 909 910 /* 911 * Arg: 912 * device : video output device (LCD, CRT, ..) 913 * 914 * Return Value: 915 * Maximum brightness level 916 * 917 * Allocate and initialize device->brightness. 918 */ 919 920 static int 921 acpi_video_init_brightness(struct acpi_video_device *device) 922 { 923 int i, max_level = 0; 924 unsigned long long level, level_old; 925 struct acpi_video_device_brightness *br = NULL; 926 int result = -EINVAL; 927 928 result = acpi_video_get_levels(device->dev, &br, &max_level); 929 if (result) 930 return result; 931 device->brightness = br; 932 933 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 934 br->curr = level = max_level; 935 936 if (!device->cap._BQC) 937 goto set_level; 938 939 result = acpi_video_device_lcd_get_level_current(device, 940 &level_old, true); 941 if (result) 942 goto out_free_levels; 943 944 result = acpi_video_bqc_quirk(device, max_level, level_old); 945 if (result) 946 goto out_free_levels; 947 /* 948 * cap._BQC may get cleared due to _BQC is found to be broken 949 * in acpi_video_bqc_quirk, so check again here. 950 */ 951 if (!device->cap._BQC) 952 goto set_level; 953 954 level = acpi_video_bqc_value_to_level(device, level_old); 955 /* 956 * On some buggy laptops, _BQC returns an uninitialized 957 * value when invoked for the first time, i.e. 958 * level_old is invalid (no matter whether it's a level 959 * or an index). Set the backlight to max_level in this case. 960 */ 961 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 962 if (level == br->levels[i]) 963 break; 964 if (i == br->count || !level) 965 level = max_level; 966 967 set_level: 968 result = acpi_video_device_lcd_set_level(device, level); 969 if (result) 970 goto out_free_levels; 971 972 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 973 "found %d brightness levels\n", 974 br->count - ACPI_VIDEO_FIRST_LEVEL)); 975 return 0; 976 977 out_free_levels: 978 kfree(br->levels); 979 kfree(br); 980 device->brightness = NULL; 981 return result; 982 } 983 984 /* 985 * Arg: 986 * device : video output device (LCD, CRT, ..) 987 * 988 * Return Value: 989 * None 990 * 991 * Find out all required AML methods defined under the output 992 * device. 993 */ 994 995 static void acpi_video_device_find_cap(struct acpi_video_device *device) 996 { 997 if (acpi_has_method(device->dev->handle, "_ADR")) 998 device->cap._ADR = 1; 999 if (acpi_has_method(device->dev->handle, "_BCL")) 1000 device->cap._BCL = 1; 1001 if (acpi_has_method(device->dev->handle, "_BCM")) 1002 device->cap._BCM = 1; 1003 if (acpi_has_method(device->dev->handle, "_BQC")) { 1004 device->cap._BQC = 1; 1005 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 1006 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n"); 1007 device->cap._BCQ = 1; 1008 } 1009 1010 if (acpi_has_method(device->dev->handle, "_DDC")) 1011 device->cap._DDC = 1; 1012 } 1013 1014 /* 1015 * Arg: 1016 * device : video output device (VGA) 1017 * 1018 * Return Value: 1019 * None 1020 * 1021 * Find out all required AML methods defined under the video bus device. 1022 */ 1023 1024 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1025 { 1026 if (acpi_has_method(video->device->handle, "_DOS")) 1027 video->cap._DOS = 1; 1028 if (acpi_has_method(video->device->handle, "_DOD")) 1029 video->cap._DOD = 1; 1030 if (acpi_has_method(video->device->handle, "_ROM")) 1031 video->cap._ROM = 1; 1032 if (acpi_has_method(video->device->handle, "_GPD")) 1033 video->cap._GPD = 1; 1034 if (acpi_has_method(video->device->handle, "_SPD")) 1035 video->cap._SPD = 1; 1036 if (acpi_has_method(video->device->handle, "_VPO")) 1037 video->cap._VPO = 1; 1038 } 1039 1040 /* 1041 * Check whether the video bus device has required AML method to 1042 * support the desired features 1043 */ 1044 1045 static int acpi_video_bus_check(struct acpi_video_bus *video) 1046 { 1047 acpi_status status = -ENOENT; 1048 struct pci_dev *dev; 1049 1050 if (!video) 1051 return -EINVAL; 1052 1053 dev = acpi_get_pci_dev(video->device->handle); 1054 if (!dev) 1055 return -ENODEV; 1056 pci_dev_put(dev); 1057 1058 /* 1059 * Since there is no HID, CID and so on for VGA driver, we have 1060 * to check well known required nodes. 1061 */ 1062 1063 /* Does this device support video switching? */ 1064 if (video->cap._DOS || video->cap._DOD) { 1065 if (!video->cap._DOS) { 1066 printk(KERN_WARNING FW_BUG 1067 "ACPI(%s) defines _DOD but not _DOS\n", 1068 acpi_device_bid(video->device)); 1069 } 1070 video->flags.multihead = 1; 1071 status = 0; 1072 } 1073 1074 /* Does this device support retrieving a video ROM? */ 1075 if (video->cap._ROM) { 1076 video->flags.rom = 1; 1077 status = 0; 1078 } 1079 1080 /* Does this device support configuring which video device to POST? */ 1081 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1082 video->flags.post = 1; 1083 status = 0; 1084 } 1085 1086 return status; 1087 } 1088 1089 /* 1090 * -------------------------------------------------------------------------- 1091 * Driver Interface 1092 * -------------------------------------------------------------------------- 1093 */ 1094 1095 /* device interface */ 1096 static struct acpi_video_device_attrib * 1097 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1098 { 1099 struct acpi_video_enumerated_device *ids; 1100 int i; 1101 1102 for (i = 0; i < video->attached_count; i++) { 1103 ids = &video->attached_array[i]; 1104 if ((ids->value.int_val & 0xffff) == device_id) 1105 return &ids->value.attrib; 1106 } 1107 1108 return NULL; 1109 } 1110 1111 static int 1112 acpi_video_get_device_type(struct acpi_video_bus *video, 1113 unsigned long device_id) 1114 { 1115 struct acpi_video_enumerated_device *ids; 1116 int i; 1117 1118 for (i = 0; i < video->attached_count; i++) { 1119 ids = &video->attached_array[i]; 1120 if ((ids->value.int_val & 0xffff) == device_id) 1121 return ids->value.int_val; 1122 } 1123 1124 return 0; 1125 } 1126 1127 static int 1128 acpi_video_bus_get_one_device(struct acpi_device *device, 1129 struct acpi_video_bus *video) 1130 { 1131 unsigned long long device_id; 1132 int status, device_type; 1133 struct acpi_video_device *data; 1134 struct acpi_video_device_attrib *attribute; 1135 1136 status = 1137 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1138 /* Some device omits _ADR, we skip them instead of fail */ 1139 if (ACPI_FAILURE(status)) 1140 return 0; 1141 1142 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1143 if (!data) 1144 return -ENOMEM; 1145 1146 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1147 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1148 device->driver_data = data; 1149 1150 data->device_id = device_id; 1151 data->video = video; 1152 data->dev = device; 1153 INIT_DELAYED_WORK(&data->switch_brightness_work, 1154 acpi_video_switch_brightness); 1155 1156 attribute = acpi_video_get_device_attr(video, device_id); 1157 1158 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1159 switch (attribute->display_type) { 1160 case ACPI_VIDEO_DISPLAY_CRT: 1161 data->flags.crt = 1; 1162 break; 1163 case ACPI_VIDEO_DISPLAY_TV: 1164 data->flags.tvout = 1; 1165 break; 1166 case ACPI_VIDEO_DISPLAY_DVI: 1167 data->flags.dvi = 1; 1168 break; 1169 case ACPI_VIDEO_DISPLAY_LCD: 1170 data->flags.lcd = 1; 1171 break; 1172 default: 1173 data->flags.unknown = 1; 1174 break; 1175 } 1176 if (attribute->bios_can_detect) 1177 data->flags.bios = 1; 1178 } else { 1179 /* Check for legacy IDs */ 1180 device_type = acpi_video_get_device_type(video, device_id); 1181 /* Ignore bits 16 and 18-20 */ 1182 switch (device_type & 0xffe2ffff) { 1183 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1184 data->flags.crt = 1; 1185 break; 1186 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1187 data->flags.lcd = 1; 1188 break; 1189 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1190 data->flags.tvout = 1; 1191 break; 1192 default: 1193 data->flags.unknown = 1; 1194 } 1195 } 1196 1197 acpi_video_device_bind(video, data); 1198 acpi_video_device_find_cap(data); 1199 1200 mutex_lock(&video->device_list_lock); 1201 list_add_tail(&data->entry, &video->video_device_list); 1202 mutex_unlock(&video->device_list_lock); 1203 1204 return status; 1205 } 1206 1207 /* 1208 * Arg: 1209 * video : video bus device 1210 * 1211 * Return: 1212 * none 1213 * 1214 * Enumerate the video device list of the video bus, 1215 * bind the ids with the corresponding video devices 1216 * under the video bus. 1217 */ 1218 1219 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1220 { 1221 struct acpi_video_device *dev; 1222 1223 mutex_lock(&video->device_list_lock); 1224 1225 list_for_each_entry(dev, &video->video_device_list, entry) 1226 acpi_video_device_bind(video, dev); 1227 1228 mutex_unlock(&video->device_list_lock); 1229 } 1230 1231 /* 1232 * Arg: 1233 * video : video bus device 1234 * device : video output device under the video 1235 * bus 1236 * 1237 * Return: 1238 * none 1239 * 1240 * Bind the ids with the corresponding video devices 1241 * under the video bus. 1242 */ 1243 1244 static void 1245 acpi_video_device_bind(struct acpi_video_bus *video, 1246 struct acpi_video_device *device) 1247 { 1248 struct acpi_video_enumerated_device *ids; 1249 int i; 1250 1251 for (i = 0; i < video->attached_count; i++) { 1252 ids = &video->attached_array[i]; 1253 if (device->device_id == (ids->value.int_val & 0xffff)) { 1254 ids->bind_info = device; 1255 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i)); 1256 } 1257 } 1258 } 1259 1260 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1261 { 1262 struct acpi_video_bus *video = device->video; 1263 int i; 1264 1265 /* 1266 * If we have a broken _DOD or we have more than 8 output devices 1267 * under the graphics controller node that we can't proper deal with 1268 * in the operation region code currently, no need to test. 1269 */ 1270 if (!video->attached_count || video->child_count > 8) 1271 return true; 1272 1273 for (i = 0; i < video->attached_count; i++) { 1274 if ((video->attached_array[i].value.int_val & 0xfff) == 1275 (device->device_id & 0xfff)) 1276 return true; 1277 } 1278 1279 return false; 1280 } 1281 1282 /* 1283 * Arg: 1284 * video : video bus device 1285 * 1286 * Return: 1287 * < 0 : error 1288 * 1289 * Call _DOD to enumerate all devices attached to display adapter 1290 * 1291 */ 1292 1293 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1294 { 1295 int status; 1296 int count; 1297 int i; 1298 struct acpi_video_enumerated_device *active_list; 1299 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1300 union acpi_object *dod = NULL; 1301 union acpi_object *obj; 1302 1303 if (!video->cap._DOD) 1304 return AE_NOT_EXIST; 1305 1306 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1307 if (!ACPI_SUCCESS(status)) { 1308 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD")); 1309 return status; 1310 } 1311 1312 dod = buffer.pointer; 1313 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1314 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data")); 1315 status = -EFAULT; 1316 goto out; 1317 } 1318 1319 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n", 1320 dod->package.count)); 1321 1322 active_list = kcalloc(1 + dod->package.count, 1323 sizeof(struct acpi_video_enumerated_device), 1324 GFP_KERNEL); 1325 if (!active_list) { 1326 status = -ENOMEM; 1327 goto out; 1328 } 1329 1330 count = 0; 1331 for (i = 0; i < dod->package.count; i++) { 1332 obj = &dod->package.elements[i]; 1333 1334 if (obj->type != ACPI_TYPE_INTEGER) { 1335 printk(KERN_ERR PREFIX 1336 "Invalid _DOD data in element %d\n", i); 1337 continue; 1338 } 1339 1340 active_list[count].value.int_val = obj->integer.value; 1341 active_list[count].bind_info = NULL; 1342 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, 1343 (int)obj->integer.value)); 1344 count++; 1345 } 1346 1347 kfree(video->attached_array); 1348 1349 video->attached_array = active_list; 1350 video->attached_count = count; 1351 1352 out: 1353 kfree(buffer.pointer); 1354 return status; 1355 } 1356 1357 static int 1358 acpi_video_get_next_level(struct acpi_video_device *device, 1359 u32 level_current, u32 event) 1360 { 1361 int min, max, min_above, max_below, i, l, delta = 255; 1362 max = max_below = 0; 1363 min = min_above = 255; 1364 /* Find closest level to level_current */ 1365 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1366 l = device->brightness->levels[i]; 1367 if (abs(l - level_current) < abs(delta)) { 1368 delta = l - level_current; 1369 if (!delta) 1370 break; 1371 } 1372 } 1373 /* Ajust level_current to closest available level */ 1374 level_current += delta; 1375 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1376 l = device->brightness->levels[i]; 1377 if (l < min) 1378 min = l; 1379 if (l > max) 1380 max = l; 1381 if (l < min_above && l > level_current) 1382 min_above = l; 1383 if (l > max_below && l < level_current) 1384 max_below = l; 1385 } 1386 1387 switch (event) { 1388 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1389 return (level_current < max) ? min_above : min; 1390 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1391 return (level_current < max) ? min_above : max; 1392 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1393 return (level_current > min) ? max_below : min; 1394 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1395 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1396 return 0; 1397 default: 1398 return level_current; 1399 } 1400 } 1401 1402 static void 1403 acpi_video_switch_brightness(struct work_struct *work) 1404 { 1405 struct acpi_video_device *device = container_of(to_delayed_work(work), 1406 struct acpi_video_device, switch_brightness_work); 1407 unsigned long long level_current, level_next; 1408 int event = device->switch_brightness_event; 1409 int result = -EINVAL; 1410 1411 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1412 if (!device->backlight) 1413 return; 1414 1415 if (!device->brightness) 1416 goto out; 1417 1418 result = acpi_video_device_lcd_get_level_current(device, 1419 &level_current, 1420 false); 1421 if (result) 1422 goto out; 1423 1424 level_next = acpi_video_get_next_level(device, level_current, event); 1425 1426 result = acpi_video_device_lcd_set_level(device, level_next); 1427 1428 if (!result) 1429 backlight_force_update(device->backlight, 1430 BACKLIGHT_UPDATE_HOTKEY); 1431 1432 out: 1433 if (result) 1434 printk(KERN_ERR PREFIX "Failed to switch the brightness\n"); 1435 } 1436 1437 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1438 void **edid) 1439 { 1440 struct acpi_video_bus *video; 1441 struct acpi_video_device *video_device; 1442 union acpi_object *buffer = NULL; 1443 acpi_status status; 1444 int i, length; 1445 1446 if (!device || !acpi_driver_data(device)) 1447 return -EINVAL; 1448 1449 video = acpi_driver_data(device); 1450 1451 for (i = 0; i < video->attached_count; i++) { 1452 video_device = video->attached_array[i].bind_info; 1453 length = 256; 1454 1455 if (!video_device) 1456 continue; 1457 1458 if (!video_device->cap._DDC) 1459 continue; 1460 1461 if (type) { 1462 switch (type) { 1463 case ACPI_VIDEO_DISPLAY_CRT: 1464 if (!video_device->flags.crt) 1465 continue; 1466 break; 1467 case ACPI_VIDEO_DISPLAY_TV: 1468 if (!video_device->flags.tvout) 1469 continue; 1470 break; 1471 case ACPI_VIDEO_DISPLAY_DVI: 1472 if (!video_device->flags.dvi) 1473 continue; 1474 break; 1475 case ACPI_VIDEO_DISPLAY_LCD: 1476 if (!video_device->flags.lcd) 1477 continue; 1478 break; 1479 } 1480 } else if (video_device->device_id != device_id) { 1481 continue; 1482 } 1483 1484 status = acpi_video_device_EDID(video_device, &buffer, length); 1485 1486 if (ACPI_FAILURE(status) || !buffer || 1487 buffer->type != ACPI_TYPE_BUFFER) { 1488 length = 128; 1489 status = acpi_video_device_EDID(video_device, &buffer, 1490 length); 1491 if (ACPI_FAILURE(status) || !buffer || 1492 buffer->type != ACPI_TYPE_BUFFER) { 1493 continue; 1494 } 1495 } 1496 1497 *edid = buffer->buffer.pointer; 1498 return length; 1499 } 1500 1501 return -ENODEV; 1502 } 1503 EXPORT_SYMBOL(acpi_video_get_edid); 1504 1505 static int 1506 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1507 struct acpi_device *device) 1508 { 1509 int status = 0; 1510 struct acpi_device *dev; 1511 1512 /* 1513 * There are systems where video module known to work fine regardless 1514 * of broken _DOD and ignoring returned value here doesn't cause 1515 * any issues later. 1516 */ 1517 acpi_video_device_enumerate(video); 1518 1519 list_for_each_entry(dev, &device->children, node) { 1520 1521 status = acpi_video_bus_get_one_device(dev, video); 1522 if (status) { 1523 dev_err(&dev->dev, "Can't attach device\n"); 1524 break; 1525 } 1526 video->child_count++; 1527 } 1528 return status; 1529 } 1530 1531 /* acpi_video interface */ 1532 1533 /* 1534 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1535 * preform any automatic brightness change on receiving a notification. 1536 */ 1537 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1538 { 1539 return acpi_video_bus_DOS(video, 0, 1540 acpi_osi_is_win8() ? 1 : 0); 1541 } 1542 1543 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1544 { 1545 return acpi_video_bus_DOS(video, 0, 1546 acpi_osi_is_win8() ? 0 : 1); 1547 } 1548 1549 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1550 { 1551 struct acpi_video_bus *video = acpi_driver_data(device); 1552 struct input_dev *input; 1553 int keycode = 0; 1554 1555 if (!video || !video->input) 1556 return; 1557 1558 input = video->input; 1559 1560 switch (event) { 1561 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1562 * most likely via hotkey. */ 1563 keycode = KEY_SWITCHVIDEOMODE; 1564 break; 1565 1566 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1567 * connector. */ 1568 acpi_video_device_enumerate(video); 1569 acpi_video_device_rebind(video); 1570 keycode = KEY_SWITCHVIDEOMODE; 1571 break; 1572 1573 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1574 keycode = KEY_SWITCHVIDEOMODE; 1575 break; 1576 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1577 keycode = KEY_VIDEO_NEXT; 1578 break; 1579 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1580 keycode = KEY_VIDEO_PREV; 1581 break; 1582 1583 default: 1584 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1585 "Unsupported event [0x%x]\n", event)); 1586 break; 1587 } 1588 1589 if (acpi_notifier_call_chain(device, event, 0)) 1590 /* Something vetoed the keypress. */ 1591 keycode = 0; 1592 1593 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1594 input_report_key(input, keycode, 1); 1595 input_sync(input); 1596 input_report_key(input, keycode, 0); 1597 input_sync(input); 1598 } 1599 1600 return; 1601 } 1602 1603 static void brightness_switch_event(struct acpi_video_device *video_device, 1604 u32 event) 1605 { 1606 if (!brightness_switch_enabled) 1607 return; 1608 1609 video_device->switch_brightness_event = event; 1610 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1611 } 1612 1613 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1614 { 1615 struct acpi_video_device *video_device = data; 1616 struct acpi_device *device = NULL; 1617 struct acpi_video_bus *bus; 1618 struct input_dev *input; 1619 int keycode = 0; 1620 1621 if (!video_device) 1622 return; 1623 1624 device = video_device->dev; 1625 bus = video_device->video; 1626 input = bus->input; 1627 1628 switch (event) { 1629 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1630 brightness_switch_event(video_device, event); 1631 keycode = KEY_BRIGHTNESS_CYCLE; 1632 break; 1633 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1634 brightness_switch_event(video_device, event); 1635 keycode = KEY_BRIGHTNESSUP; 1636 break; 1637 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1638 brightness_switch_event(video_device, event); 1639 keycode = KEY_BRIGHTNESSDOWN; 1640 break; 1641 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1642 brightness_switch_event(video_device, event); 1643 keycode = KEY_BRIGHTNESS_ZERO; 1644 break; 1645 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1646 brightness_switch_event(video_device, event); 1647 keycode = KEY_DISPLAY_OFF; 1648 break; 1649 default: 1650 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1651 "Unsupported event [0x%x]\n", event)); 1652 break; 1653 } 1654 1655 acpi_notifier_call_chain(device, event, 0); 1656 1657 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1658 input_report_key(input, keycode, 1); 1659 input_sync(input); 1660 input_report_key(input, keycode, 0); 1661 input_sync(input); 1662 } 1663 1664 return; 1665 } 1666 1667 static int acpi_video_resume(struct notifier_block *nb, 1668 unsigned long val, void *ign) 1669 { 1670 struct acpi_video_bus *video; 1671 struct acpi_video_device *video_device; 1672 int i; 1673 1674 switch (val) { 1675 case PM_HIBERNATION_PREPARE: 1676 case PM_SUSPEND_PREPARE: 1677 case PM_RESTORE_PREPARE: 1678 return NOTIFY_DONE; 1679 } 1680 1681 video = container_of(nb, struct acpi_video_bus, pm_nb); 1682 1683 dev_info(&video->device->dev, "Restoring backlight state\n"); 1684 1685 for (i = 0; i < video->attached_count; i++) { 1686 video_device = video->attached_array[i].bind_info; 1687 if (video_device && video_device->brightness) 1688 acpi_video_device_lcd_set_level(video_device, 1689 video_device->brightness->curr); 1690 } 1691 1692 return NOTIFY_OK; 1693 } 1694 1695 static acpi_status 1696 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1697 void **return_value) 1698 { 1699 struct acpi_device *device = context; 1700 struct acpi_device *sibling; 1701 int result; 1702 1703 if (handle == device->handle) 1704 return AE_CTRL_TERMINATE; 1705 1706 result = acpi_bus_get_device(handle, &sibling); 1707 if (result) 1708 return AE_OK; 1709 1710 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1711 return AE_ALREADY_EXISTS; 1712 1713 return AE_OK; 1714 } 1715 1716 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1717 { 1718 struct backlight_properties props; 1719 struct pci_dev *pdev; 1720 acpi_handle acpi_parent; 1721 struct device *parent = NULL; 1722 int result; 1723 static int count; 1724 char *name; 1725 1726 result = acpi_video_init_brightness(device); 1727 if (result) 1728 return; 1729 1730 if (disable_backlight_sysfs_if > 0) 1731 return; 1732 1733 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1734 if (!name) 1735 return; 1736 count++; 1737 1738 acpi_get_parent(device->dev->handle, &acpi_parent); 1739 1740 pdev = acpi_get_pci_dev(acpi_parent); 1741 if (pdev) { 1742 parent = &pdev->dev; 1743 pci_dev_put(pdev); 1744 } 1745 1746 memset(&props, 0, sizeof(struct backlight_properties)); 1747 props.type = BACKLIGHT_FIRMWARE; 1748 props.max_brightness = 1749 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1750 device->backlight = backlight_device_register(name, 1751 parent, 1752 device, 1753 &acpi_backlight_ops, 1754 &props); 1755 kfree(name); 1756 if (IS_ERR(device->backlight)) { 1757 device->backlight = NULL; 1758 return; 1759 } 1760 1761 /* 1762 * Save current brightness level in case we have to restore it 1763 * before acpi_video_device_lcd_set_level() is called next time. 1764 */ 1765 device->backlight->props.brightness = 1766 acpi_video_get_brightness(device->backlight); 1767 1768 device->cooling_dev = thermal_cooling_device_register("LCD", 1769 device->dev, &video_cooling_ops); 1770 if (IS_ERR(device->cooling_dev)) { 1771 /* 1772 * Set cooling_dev to NULL so we don't crash trying to free it. 1773 * Also, why the hell we are returning early and not attempt to 1774 * register video output if cooling device registration failed? 1775 * -- dtor 1776 */ 1777 device->cooling_dev = NULL; 1778 return; 1779 } 1780 1781 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1782 device->cooling_dev->id); 1783 result = sysfs_create_link(&device->dev->dev.kobj, 1784 &device->cooling_dev->device.kobj, 1785 "thermal_cooling"); 1786 if (result) 1787 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1788 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1789 &device->dev->dev.kobj, "device"); 1790 if (result) 1791 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1792 } 1793 1794 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1795 { 1796 struct acpi_video_device *dev; 1797 union acpi_object *levels; 1798 1799 mutex_lock(&video->device_list_lock); 1800 list_for_each_entry(dev, &video->video_device_list, entry) { 1801 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1802 kfree(levels); 1803 } 1804 mutex_unlock(&video->device_list_lock); 1805 } 1806 1807 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1808 { 1809 /* 1810 * Do not create backlight device for video output 1811 * device that is not in the enumerated list. 1812 */ 1813 if (!acpi_video_device_in_dod(dev)) { 1814 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1815 return false; 1816 } 1817 1818 if (only_lcd) 1819 return dev->flags.lcd; 1820 return true; 1821 } 1822 1823 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1824 { 1825 struct acpi_video_device *dev; 1826 1827 if (video->backlight_registered) 1828 return 0; 1829 1830 acpi_video_run_bcl_for_osi(video); 1831 1832 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1833 return 0; 1834 1835 mutex_lock(&video->device_list_lock); 1836 list_for_each_entry(dev, &video->video_device_list, entry) { 1837 if (acpi_video_should_register_backlight(dev)) 1838 acpi_video_dev_register_backlight(dev); 1839 } 1840 mutex_unlock(&video->device_list_lock); 1841 1842 video->backlight_registered = true; 1843 1844 video->pm_nb.notifier_call = acpi_video_resume; 1845 video->pm_nb.priority = 0; 1846 return register_pm_notifier(&video->pm_nb); 1847 } 1848 1849 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1850 { 1851 if (device->backlight) { 1852 backlight_device_unregister(device->backlight); 1853 device->backlight = NULL; 1854 } 1855 if (device->brightness) { 1856 kfree(device->brightness->levels); 1857 kfree(device->brightness); 1858 device->brightness = NULL; 1859 } 1860 if (device->cooling_dev) { 1861 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1862 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1863 thermal_cooling_device_unregister(device->cooling_dev); 1864 device->cooling_dev = NULL; 1865 } 1866 } 1867 1868 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1869 { 1870 struct acpi_video_device *dev; 1871 int error; 1872 1873 if (!video->backlight_registered) 1874 return 0; 1875 1876 error = unregister_pm_notifier(&video->pm_nb); 1877 1878 mutex_lock(&video->device_list_lock); 1879 list_for_each_entry(dev, &video->video_device_list, entry) 1880 acpi_video_dev_unregister_backlight(dev); 1881 mutex_unlock(&video->device_list_lock); 1882 1883 video->backlight_registered = false; 1884 1885 return error; 1886 } 1887 1888 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1889 { 1890 acpi_status status; 1891 struct acpi_device *adev = device->dev; 1892 1893 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1894 acpi_video_device_notify, device); 1895 if (ACPI_FAILURE(status)) 1896 dev_err(&adev->dev, "Error installing notify handler\n"); 1897 else 1898 device->flags.notify = 1; 1899 } 1900 1901 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1902 { 1903 struct input_dev *input; 1904 struct acpi_video_device *dev; 1905 int error; 1906 1907 video->input = input = input_allocate_device(); 1908 if (!input) { 1909 error = -ENOMEM; 1910 goto out; 1911 } 1912 1913 error = acpi_video_bus_start_devices(video); 1914 if (error) 1915 goto err_free_input; 1916 1917 snprintf(video->phys, sizeof(video->phys), 1918 "%s/video/input0", acpi_device_hid(video->device)); 1919 1920 input->name = acpi_device_name(video->device); 1921 input->phys = video->phys; 1922 input->id.bustype = BUS_HOST; 1923 input->id.product = 0x06; 1924 input->dev.parent = &video->device->dev; 1925 input->evbit[0] = BIT(EV_KEY); 1926 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1927 set_bit(KEY_VIDEO_NEXT, input->keybit); 1928 set_bit(KEY_VIDEO_PREV, input->keybit); 1929 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1930 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1931 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1932 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1933 set_bit(KEY_DISPLAY_OFF, input->keybit); 1934 1935 error = input_register_device(input); 1936 if (error) 1937 goto err_stop_dev; 1938 1939 mutex_lock(&video->device_list_lock); 1940 list_for_each_entry(dev, &video->video_device_list, entry) 1941 acpi_video_dev_add_notify_handler(dev); 1942 mutex_unlock(&video->device_list_lock); 1943 1944 return 0; 1945 1946 err_stop_dev: 1947 acpi_video_bus_stop_devices(video); 1948 err_free_input: 1949 input_free_device(input); 1950 video->input = NULL; 1951 out: 1952 return error; 1953 } 1954 1955 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1956 { 1957 if (dev->flags.notify) { 1958 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1959 acpi_video_device_notify); 1960 dev->flags.notify = 0; 1961 } 1962 } 1963 1964 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1965 { 1966 struct acpi_video_device *dev; 1967 1968 mutex_lock(&video->device_list_lock); 1969 list_for_each_entry(dev, &video->video_device_list, entry) 1970 acpi_video_dev_remove_notify_handler(dev); 1971 mutex_unlock(&video->device_list_lock); 1972 1973 acpi_video_bus_stop_devices(video); 1974 input_unregister_device(video->input); 1975 video->input = NULL; 1976 } 1977 1978 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1979 { 1980 struct acpi_video_device *dev, *next; 1981 1982 mutex_lock(&video->device_list_lock); 1983 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1984 list_del(&dev->entry); 1985 kfree(dev); 1986 } 1987 mutex_unlock(&video->device_list_lock); 1988 1989 return 0; 1990 } 1991 1992 static int instance; 1993 1994 static int acpi_video_bus_add(struct acpi_device *device) 1995 { 1996 struct acpi_video_bus *video; 1997 int error; 1998 acpi_status status; 1999 2000 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 2001 device->parent->handle, 1, 2002 acpi_video_bus_match, NULL, 2003 device, NULL); 2004 if (status == AE_ALREADY_EXISTS) { 2005 printk(KERN_WARNING FW_BUG 2006 "Duplicate ACPI video bus devices for the" 2007 " same VGA controller, please try module " 2008 "parameter \"video.allow_duplicates=1\"" 2009 "if the current driver doesn't work.\n"); 2010 if (!allow_duplicates) 2011 return -ENODEV; 2012 } 2013 2014 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2015 if (!video) 2016 return -ENOMEM; 2017 2018 /* a hack to fix the duplicate name "VID" problem on T61 */ 2019 if (!strcmp(device->pnp.bus_id, "VID")) { 2020 if (instance) 2021 device->pnp.bus_id[3] = '0' + instance; 2022 instance++; 2023 } 2024 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2025 if (!strcmp(device->pnp.bus_id, "VGA")) { 2026 if (instance) 2027 device->pnp.bus_id[3] = '0' + instance; 2028 instance++; 2029 } 2030 2031 video->device = device; 2032 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2033 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2034 device->driver_data = video; 2035 2036 acpi_video_bus_find_cap(video); 2037 error = acpi_video_bus_check(video); 2038 if (error) 2039 goto err_free_video; 2040 2041 mutex_init(&video->device_list_lock); 2042 INIT_LIST_HEAD(&video->video_device_list); 2043 2044 error = acpi_video_bus_get_devices(video, device); 2045 if (error) 2046 goto err_put_video; 2047 2048 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n", 2049 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2050 video->flags.multihead ? "yes" : "no", 2051 video->flags.rom ? "yes" : "no", 2052 video->flags.post ? "yes" : "no"); 2053 mutex_lock(&video_list_lock); 2054 list_add_tail(&video->entry, &video_bus_head); 2055 mutex_unlock(&video_list_lock); 2056 2057 acpi_video_bus_register_backlight(video); 2058 acpi_video_bus_add_notify_handler(video); 2059 2060 return 0; 2061 2062 err_put_video: 2063 acpi_video_bus_put_devices(video); 2064 kfree(video->attached_array); 2065 err_free_video: 2066 kfree(video); 2067 device->driver_data = NULL; 2068 2069 return error; 2070 } 2071 2072 static int acpi_video_bus_remove(struct acpi_device *device) 2073 { 2074 struct acpi_video_bus *video = NULL; 2075 2076 2077 if (!device || !acpi_driver_data(device)) 2078 return -EINVAL; 2079 2080 video = acpi_driver_data(device); 2081 2082 acpi_video_bus_remove_notify_handler(video); 2083 acpi_video_bus_unregister_backlight(video); 2084 acpi_video_bus_put_devices(video); 2085 2086 mutex_lock(&video_list_lock); 2087 list_del(&video->entry); 2088 mutex_unlock(&video_list_lock); 2089 2090 kfree(video->attached_array); 2091 kfree(video); 2092 2093 return 0; 2094 } 2095 2096 static int __init is_i740(struct pci_dev *dev) 2097 { 2098 if (dev->device == 0x00D1) 2099 return 1; 2100 if (dev->device == 0x7000) 2101 return 1; 2102 return 0; 2103 } 2104 2105 static int __init intel_opregion_present(void) 2106 { 2107 int opregion = 0; 2108 struct pci_dev *dev = NULL; 2109 u32 address; 2110 2111 for_each_pci_dev(dev) { 2112 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2113 continue; 2114 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2115 continue; 2116 /* We don't want to poke around undefined i740 registers */ 2117 if (is_i740(dev)) 2118 continue; 2119 pci_read_config_dword(dev, 0xfc, &address); 2120 if (!address) 2121 continue; 2122 opregion = 1; 2123 } 2124 return opregion; 2125 } 2126 2127 static bool dmi_is_desktop(void) 2128 { 2129 const char *chassis_type; 2130 2131 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2132 if (!chassis_type) 2133 return false; 2134 2135 if (!strcmp(chassis_type, "3") || /* 3: Desktop */ 2136 !strcmp(chassis_type, "4") || /* 4: Low Profile Desktop */ 2137 !strcmp(chassis_type, "5") || /* 5: Pizza Box */ 2138 !strcmp(chassis_type, "6") || /* 6: Mini Tower */ 2139 !strcmp(chassis_type, "7") || /* 7: Tower */ 2140 !strcmp(chassis_type, "11")) /* 11: Main Server Chassis */ 2141 return true; 2142 2143 return false; 2144 } 2145 2146 int acpi_video_register(void) 2147 { 2148 int ret = 0; 2149 2150 mutex_lock(®ister_count_mutex); 2151 if (register_count) { 2152 /* 2153 * if the function of acpi_video_register is already called, 2154 * don't register the acpi_vide_bus again and return no error. 2155 */ 2156 goto leave; 2157 } 2158 2159 /* 2160 * We're seeing a lot of bogus backlight interfaces on newer machines 2161 * without a LCD such as desktops, servers and HDMI sticks. Checking 2162 * the lcd flag fixes this, so enable this on any machines which are 2163 * win8 ready (where we also prefer the native backlight driver, so 2164 * normally the acpi_video code should not register there anyways). 2165 */ 2166 if (only_lcd == -1) { 2167 if (dmi_is_desktop() && acpi_osi_is_win8()) 2168 only_lcd = true; 2169 else 2170 only_lcd = false; 2171 } 2172 2173 dmi_check_system(video_dmi_table); 2174 2175 ret = acpi_bus_register_driver(&acpi_video_bus); 2176 if (ret) 2177 goto leave; 2178 2179 /* 2180 * When the acpi_video_bus is loaded successfully, increase 2181 * the counter reference. 2182 */ 2183 register_count = 1; 2184 2185 leave: 2186 mutex_unlock(®ister_count_mutex); 2187 return ret; 2188 } 2189 EXPORT_SYMBOL(acpi_video_register); 2190 2191 void acpi_video_unregister(void) 2192 { 2193 mutex_lock(®ister_count_mutex); 2194 if (register_count) { 2195 acpi_bus_unregister_driver(&acpi_video_bus); 2196 register_count = 0; 2197 } 2198 mutex_unlock(®ister_count_mutex); 2199 } 2200 EXPORT_SYMBOL(acpi_video_unregister); 2201 2202 void acpi_video_unregister_backlight(void) 2203 { 2204 struct acpi_video_bus *video; 2205 2206 mutex_lock(®ister_count_mutex); 2207 if (register_count) { 2208 mutex_lock(&video_list_lock); 2209 list_for_each_entry(video, &video_bus_head, entry) 2210 acpi_video_bus_unregister_backlight(video); 2211 mutex_unlock(&video_list_lock); 2212 } 2213 mutex_unlock(®ister_count_mutex); 2214 } 2215 2216 bool acpi_video_handles_brightness_key_presses(void) 2217 { 2218 bool have_video_busses; 2219 2220 mutex_lock(&video_list_lock); 2221 have_video_busses = !list_empty(&video_bus_head); 2222 mutex_unlock(&video_list_lock); 2223 2224 return have_video_busses && 2225 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2226 } 2227 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2228 2229 /* 2230 * This is kind of nasty. Hardware using Intel chipsets may require 2231 * the video opregion code to be run first in order to initialise 2232 * state before any ACPI video calls are made. To handle this we defer 2233 * registration of the video class until the opregion code has run. 2234 */ 2235 2236 static int __init acpi_video_init(void) 2237 { 2238 /* 2239 * Let the module load even if ACPI is disabled (e.g. due to 2240 * a broken BIOS) so that i915.ko can still be loaded on such 2241 * old systems without an AcpiOpRegion. 2242 * 2243 * acpi_video_register() will report -ENODEV later as well due 2244 * to acpi_disabled when i915.ko tries to register itself afterwards. 2245 */ 2246 if (acpi_disabled) 2247 return 0; 2248 2249 if (intel_opregion_present()) 2250 return 0; 2251 2252 return acpi_video_register(); 2253 } 2254 2255 static void __exit acpi_video_exit(void) 2256 { 2257 acpi_video_detect_exit(); 2258 acpi_video_unregister(); 2259 2260 return; 2261 } 2262 2263 module_init(acpi_video_init); 2264 module_exit(acpi_video_exit); 2265