1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * video.c - ACPI Video Driver 4 * 5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> 6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org> 7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/types.h> 14 #include <linux/list.h> 15 #include <linux/mutex.h> 16 #include <linux/input.h> 17 #include <linux/backlight.h> 18 #include <linux/thermal.h> 19 #include <linux/sort.h> 20 #include <linux/pci.h> 21 #include <linux/pci_ids.h> 22 #include <linux/slab.h> 23 #include <linux/dmi.h> 24 #include <linux/suspend.h> 25 #include <linux/acpi.h> 26 #include <acpi/video.h> 27 #include <linux/uaccess.h> 28 29 #define PREFIX "ACPI: " 30 31 #define ACPI_VIDEO_BUS_NAME "Video Bus" 32 #define ACPI_VIDEO_DEVICE_NAME "Video Device" 33 34 #define MAX_NAME_LEN 20 35 36 #define _COMPONENT ACPI_VIDEO_COMPONENT 37 ACPI_MODULE_NAME("video"); 38 39 MODULE_AUTHOR("Bruno Ducrot"); 40 MODULE_DESCRIPTION("ACPI Video Driver"); 41 MODULE_LICENSE("GPL"); 42 43 static bool brightness_switch_enabled = true; 44 module_param(brightness_switch_enabled, bool, 0644); 45 46 /* 47 * By default, we don't allow duplicate ACPI video bus devices 48 * under the same VGA controller 49 */ 50 static bool allow_duplicates; 51 module_param(allow_duplicates, bool, 0644); 52 53 static int disable_backlight_sysfs_if = -1; 54 module_param(disable_backlight_sysfs_if, int, 0444); 55 56 #define REPORT_OUTPUT_KEY_EVENTS 0x01 57 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 58 static int report_key_events = -1; 59 module_param(report_key_events, int, 0644); 60 MODULE_PARM_DESC(report_key_events, 61 "0: none, 1: output changes, 2: brightness changes, 3: all"); 62 63 /* 64 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 65 * assumed even if not actually set. 66 */ 67 static bool device_id_scheme = false; 68 module_param(device_id_scheme, bool, 0444); 69 70 static int only_lcd = -1; 71 module_param(only_lcd, int, 0444); 72 73 static int register_count; 74 static DEFINE_MUTEX(register_count_mutex); 75 static DEFINE_MUTEX(video_list_lock); 76 static LIST_HEAD(video_bus_head); 77 static int acpi_video_bus_add(struct acpi_device *device); 78 static int acpi_video_bus_remove(struct acpi_device *device); 79 static void acpi_video_bus_notify(struct acpi_device *device, u32 event); 80 void acpi_video_detect_exit(void); 81 82 /* 83 * Indices in the _BCL method response: the first two items are special, 84 * the rest are all supported levels. 85 * 86 * See page 575 of the ACPI spec 3.0 87 */ 88 enum acpi_video_level_idx { 89 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 90 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 91 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 92 }; 93 94 static const struct acpi_device_id video_device_ids[] = { 95 {ACPI_VIDEO_HID, 0}, 96 {"", 0}, 97 }; 98 MODULE_DEVICE_TABLE(acpi, video_device_ids); 99 100 static struct acpi_driver acpi_video_bus = { 101 .name = "video", 102 .class = ACPI_VIDEO_CLASS, 103 .ids = video_device_ids, 104 .ops = { 105 .add = acpi_video_bus_add, 106 .remove = acpi_video_bus_remove, 107 .notify = acpi_video_bus_notify, 108 }, 109 }; 110 111 struct acpi_video_bus_flags { 112 u8 multihead:1; /* can switch video heads */ 113 u8 rom:1; /* can retrieve a video rom */ 114 u8 post:1; /* can configure the head to */ 115 u8 reserved:5; 116 }; 117 118 struct acpi_video_bus_cap { 119 u8 _DOS:1; /* Enable/Disable output switching */ 120 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 121 u8 _ROM:1; /* Get ROM Data */ 122 u8 _GPD:1; /* Get POST Device */ 123 u8 _SPD:1; /* Set POST Device */ 124 u8 _VPO:1; /* Video POST Options */ 125 u8 reserved:2; 126 }; 127 128 struct acpi_video_device_attrib { 129 u32 display_index:4; /* A zero-based instance of the Display */ 130 u32 display_port_attachment:4; /* This field differentiates the display type */ 131 u32 display_type:4; /* Describe the specific type in use */ 132 u32 vendor_specific:4; /* Chipset Vendor Specific */ 133 u32 bios_can_detect:1; /* BIOS can detect the device */ 134 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 135 the VGA device. */ 136 u32 pipe_id:3; /* For VGA multiple-head devices. */ 137 u32 reserved:10; /* Must be 0 */ 138 139 /* 140 * The device ID might not actually follow the scheme described by this 141 * struct acpi_video_device_attrib. If it does, then this bit 142 * device_id_scheme is set; otherwise, other fields should be ignored. 143 * 144 * (but also see the global flag device_id_scheme) 145 */ 146 u32 device_id_scheme:1; 147 }; 148 149 struct acpi_video_enumerated_device { 150 union { 151 u32 int_val; 152 struct acpi_video_device_attrib attrib; 153 } value; 154 struct acpi_video_device *bind_info; 155 }; 156 157 struct acpi_video_bus { 158 struct acpi_device *device; 159 bool backlight_registered; 160 u8 dos_setting; 161 struct acpi_video_enumerated_device *attached_array; 162 u8 attached_count; 163 u8 child_count; 164 struct acpi_video_bus_cap cap; 165 struct acpi_video_bus_flags flags; 166 struct list_head video_device_list; 167 struct mutex device_list_lock; /* protects video_device_list */ 168 struct list_head entry; 169 struct input_dev *input; 170 char phys[32]; /* for input device */ 171 struct notifier_block pm_nb; 172 }; 173 174 struct acpi_video_device_flags { 175 u8 crt:1; 176 u8 lcd:1; 177 u8 tvout:1; 178 u8 dvi:1; 179 u8 bios:1; 180 u8 unknown:1; 181 u8 notify:1; 182 u8 reserved:1; 183 }; 184 185 struct acpi_video_device_cap { 186 u8 _ADR:1; /* Return the unique ID */ 187 u8 _BCL:1; /* Query list of brightness control levels supported */ 188 u8 _BCM:1; /* Set the brightness level */ 189 u8 _BQC:1; /* Get current brightness level */ 190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 191 u8 _DDC:1; /* Return the EDID for this device */ 192 }; 193 194 struct acpi_video_device { 195 unsigned long device_id; 196 struct acpi_video_device_flags flags; 197 struct acpi_video_device_cap cap; 198 struct list_head entry; 199 struct delayed_work switch_brightness_work; 200 int switch_brightness_event; 201 struct acpi_video_bus *video; 202 struct acpi_device *dev; 203 struct acpi_video_device_brightness *brightness; 204 struct backlight_device *backlight; 205 struct thermal_cooling_device *cooling_dev; 206 }; 207 208 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 209 static void acpi_video_device_rebind(struct acpi_video_bus *video); 210 static void acpi_video_device_bind(struct acpi_video_bus *video, 211 struct acpi_video_device *device); 212 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 213 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 214 int level); 215 static int acpi_video_device_lcd_get_level_current( 216 struct acpi_video_device *device, 217 unsigned long long *level, bool raw); 218 static int acpi_video_get_next_level(struct acpi_video_device *device, 219 u32 level_current, u32 event); 220 static void acpi_video_switch_brightness(struct work_struct *work); 221 222 /* backlight device sysfs support */ 223 static int acpi_video_get_brightness(struct backlight_device *bd) 224 { 225 unsigned long long cur_level; 226 int i; 227 struct acpi_video_device *vd = bl_get_data(bd); 228 229 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 230 return -EINVAL; 231 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 232 if (vd->brightness->levels[i] == cur_level) 233 return i - ACPI_VIDEO_FIRST_LEVEL; 234 } 235 return 0; 236 } 237 238 static int acpi_video_set_brightness(struct backlight_device *bd) 239 { 240 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 241 struct acpi_video_device *vd = bl_get_data(bd); 242 243 cancel_delayed_work(&vd->switch_brightness_work); 244 return acpi_video_device_lcd_set_level(vd, 245 vd->brightness->levels[request_level]); 246 } 247 248 static const struct backlight_ops acpi_backlight_ops = { 249 .get_brightness = acpi_video_get_brightness, 250 .update_status = acpi_video_set_brightness, 251 }; 252 253 /* thermal cooling device callbacks */ 254 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 255 unsigned long *state) 256 { 257 struct acpi_device *device = cooling_dev->devdata; 258 struct acpi_video_device *video = acpi_driver_data(device); 259 260 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 261 return 0; 262 } 263 264 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 265 unsigned long *state) 266 { 267 struct acpi_device *device = cooling_dev->devdata; 268 struct acpi_video_device *video = acpi_driver_data(device); 269 unsigned long long level; 270 int offset; 271 272 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 273 return -EINVAL; 274 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 275 offset++) 276 if (level == video->brightness->levels[offset]) { 277 *state = video->brightness->count - offset - 1; 278 return 0; 279 } 280 281 return -EINVAL; 282 } 283 284 static int 285 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 286 { 287 struct acpi_device *device = cooling_dev->devdata; 288 struct acpi_video_device *video = acpi_driver_data(device); 289 int level; 290 291 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 292 return -EINVAL; 293 294 state = video->brightness->count - state; 295 level = video->brightness->levels[state - 1]; 296 return acpi_video_device_lcd_set_level(video, level); 297 } 298 299 static const struct thermal_cooling_device_ops video_cooling_ops = { 300 .get_max_state = video_get_max_state, 301 .get_cur_state = video_get_cur_state, 302 .set_cur_state = video_set_cur_state, 303 }; 304 305 /* 306 * -------------------------------------------------------------------------- 307 * Video Management 308 * -------------------------------------------------------------------------- 309 */ 310 311 static int 312 acpi_video_device_lcd_query_levels(acpi_handle handle, 313 union acpi_object **levels) 314 { 315 int status; 316 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 317 union acpi_object *obj; 318 319 320 *levels = NULL; 321 322 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 323 if (!ACPI_SUCCESS(status)) 324 return status; 325 obj = (union acpi_object *)buffer.pointer; 326 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 327 printk(KERN_ERR PREFIX "Invalid _BCL data\n"); 328 status = -EFAULT; 329 goto err; 330 } 331 332 *levels = obj; 333 334 return 0; 335 336 err: 337 kfree(buffer.pointer); 338 339 return status; 340 } 341 342 static int 343 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 344 { 345 int status; 346 int state; 347 348 status = acpi_execute_simple_method(device->dev->handle, 349 "_BCM", level); 350 if (ACPI_FAILURE(status)) { 351 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed")); 352 return -EIO; 353 } 354 355 device->brightness->curr = level; 356 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 357 state++) 358 if (level == device->brightness->levels[state]) { 359 if (device->backlight) 360 device->backlight->props.brightness = 361 state - ACPI_VIDEO_FIRST_LEVEL; 362 return 0; 363 } 364 365 ACPI_ERROR((AE_INFO, "Current brightness invalid")); 366 return -EINVAL; 367 } 368 369 /* 370 * For some buggy _BQC methods, we need to add a constant value to 371 * the _BQC return value to get the actual current brightness level 372 */ 373 374 static int bqc_offset_aml_bug_workaround; 375 static int video_set_bqc_offset(const struct dmi_system_id *d) 376 { 377 bqc_offset_aml_bug_workaround = 9; 378 return 0; 379 } 380 381 static int video_disable_backlight_sysfs_if( 382 const struct dmi_system_id *d) 383 { 384 if (disable_backlight_sysfs_if == -1) 385 disable_backlight_sysfs_if = 1; 386 return 0; 387 } 388 389 static int video_set_device_id_scheme(const struct dmi_system_id *d) 390 { 391 device_id_scheme = true; 392 return 0; 393 } 394 395 static int video_enable_only_lcd(const struct dmi_system_id *d) 396 { 397 only_lcd = true; 398 return 0; 399 } 400 401 static int video_set_report_key_events(const struct dmi_system_id *id) 402 { 403 if (report_key_events == -1) 404 report_key_events = (uintptr_t)id->driver_data; 405 return 0; 406 } 407 408 static const struct dmi_system_id video_dmi_table[] = { 409 /* 410 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 411 */ 412 { 413 .callback = video_set_bqc_offset, 414 .ident = "Acer Aspire 5720", 415 .matches = { 416 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 417 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 418 }, 419 }, 420 { 421 .callback = video_set_bqc_offset, 422 .ident = "Acer Aspire 5710Z", 423 .matches = { 424 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 425 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 426 }, 427 }, 428 { 429 .callback = video_set_bqc_offset, 430 .ident = "eMachines E510", 431 .matches = { 432 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 433 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 434 }, 435 }, 436 { 437 .callback = video_set_bqc_offset, 438 .ident = "Acer Aspire 5315", 439 .matches = { 440 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 441 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 442 }, 443 }, 444 { 445 .callback = video_set_bqc_offset, 446 .ident = "Acer Aspire 7720", 447 .matches = { 448 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 449 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 450 }, 451 }, 452 453 /* 454 * Some machines have a broken acpi-video interface for brightness 455 * control, but still need an acpi_video_device_lcd_set_level() call 456 * on resume to turn the backlight power on. We Enable backlight 457 * control on these systems, but do not register a backlight sysfs 458 * as brightness control does not work. 459 */ 460 { 461 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 462 .callback = video_disable_backlight_sysfs_if, 463 .ident = "Toshiba Portege R700", 464 .matches = { 465 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 466 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"), 467 }, 468 }, 469 { 470 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */ 471 .callback = video_disable_backlight_sysfs_if, 472 .ident = "Toshiba Portege R830", 473 .matches = { 474 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 475 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"), 476 }, 477 }, 478 { 479 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 480 .callback = video_disable_backlight_sysfs_if, 481 .ident = "Toshiba Satellite R830", 482 .matches = { 483 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 484 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"), 485 }, 486 }, 487 /* 488 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 489 * but the IDs actually follow the Device ID Scheme. 490 */ 491 { 492 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 493 .callback = video_set_device_id_scheme, 494 .ident = "ESPRIMO Mobile M9410", 495 .matches = { 496 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 497 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 498 }, 499 }, 500 /* 501 * Some machines have multiple video output devices, but only the one 502 * that is the type of LCD can do the backlight control so we should not 503 * register backlight interface for other video output devices. 504 */ 505 { 506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 507 .callback = video_enable_only_lcd, 508 .ident = "ESPRIMO Mobile M9410", 509 .matches = { 510 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 511 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 512 }, 513 }, 514 /* 515 * Some machines report wrong key events on the acpi-bus, suppress 516 * key event reporting on these. Note this is only intended to work 517 * around events which are plain wrong. In some cases we get double 518 * events, in this case acpi-video is considered the canonical source 519 * and the events from the other source should be filtered. E.g. 520 * by calling acpi_video_handles_brightness_key_presses() from the 521 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 522 */ 523 { 524 .callback = video_set_report_key_events, 525 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 526 .ident = "Dell Vostro V131", 527 .matches = { 528 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 529 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 530 }, 531 }, 532 {} 533 }; 534 535 static unsigned long long 536 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 537 unsigned long long bqc_value) 538 { 539 unsigned long long level; 540 541 if (device->brightness->flags._BQC_use_index) { 542 /* 543 * _BQC returns an index that doesn't account for the first 2 544 * items with special meaning (see enum acpi_video_level_idx), 545 * so we need to compensate for that by offsetting ourselves 546 */ 547 if (device->brightness->flags._BCL_reversed) 548 bqc_value = device->brightness->count - 549 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 550 551 level = device->brightness->levels[bqc_value + 552 ACPI_VIDEO_FIRST_LEVEL]; 553 } else { 554 level = bqc_value; 555 } 556 557 level += bqc_offset_aml_bug_workaround; 558 559 return level; 560 } 561 562 static int 563 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 564 unsigned long long *level, bool raw) 565 { 566 acpi_status status = AE_OK; 567 int i; 568 569 if (device->cap._BQC || device->cap._BCQ) { 570 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 571 572 status = acpi_evaluate_integer(device->dev->handle, buf, 573 NULL, level); 574 if (ACPI_SUCCESS(status)) { 575 if (raw) { 576 /* 577 * Caller has indicated he wants the raw 578 * value returned by _BQC, so don't furtherly 579 * mess with the value. 580 */ 581 return 0; 582 } 583 584 *level = acpi_video_bqc_value_to_level(device, *level); 585 586 for (i = ACPI_VIDEO_FIRST_LEVEL; 587 i < device->brightness->count; i++) 588 if (device->brightness->levels[i] == *level) { 589 device->brightness->curr = *level; 590 return 0; 591 } 592 /* 593 * BQC returned an invalid level. 594 * Stop using it. 595 */ 596 ACPI_WARNING((AE_INFO, 597 "%s returned an invalid level", 598 buf)); 599 device->cap._BQC = device->cap._BCQ = 0; 600 } else { 601 /* 602 * Fixme: 603 * should we return an error or ignore this failure? 604 * dev->brightness->curr is a cached value which stores 605 * the correct current backlight level in most cases. 606 * ACPI video backlight still works w/ buggy _BQC. 607 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 608 */ 609 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf)); 610 device->cap._BQC = device->cap._BCQ = 0; 611 } 612 } 613 614 *level = device->brightness->curr; 615 return 0; 616 } 617 618 static int 619 acpi_video_device_EDID(struct acpi_video_device *device, 620 union acpi_object **edid, ssize_t length) 621 { 622 int status; 623 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 624 union acpi_object *obj; 625 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 626 struct acpi_object_list args = { 1, &arg0 }; 627 628 629 *edid = NULL; 630 631 if (!device) 632 return -ENODEV; 633 if (length == 128) 634 arg0.integer.value = 1; 635 else if (length == 256) 636 arg0.integer.value = 2; 637 else 638 return -EINVAL; 639 640 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 641 if (ACPI_FAILURE(status)) 642 return -ENODEV; 643 644 obj = buffer.pointer; 645 646 if (obj && obj->type == ACPI_TYPE_BUFFER) 647 *edid = obj; 648 else { 649 printk(KERN_ERR PREFIX "Invalid _DDC data\n"); 650 status = -EFAULT; 651 kfree(obj); 652 } 653 654 return status; 655 } 656 657 /* bus */ 658 659 /* 660 * Arg: 661 * video : video bus device pointer 662 * bios_flag : 663 * 0. The system BIOS should NOT automatically switch(toggle) 664 * the active display output. 665 * 1. The system BIOS should automatically switch (toggle) the 666 * active display output. No switch event. 667 * 2. The _DGS value should be locked. 668 * 3. The system BIOS should not automatically switch (toggle) the 669 * active display output, but instead generate the display switch 670 * event notify code. 671 * lcd_flag : 672 * 0. The system BIOS should automatically control the brightness level 673 * of the LCD when the power changes from AC to DC 674 * 1. The system BIOS should NOT automatically control the brightness 675 * level of the LCD when the power changes from AC to DC. 676 * Return Value: 677 * -EINVAL wrong arg. 678 */ 679 680 static int 681 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 682 { 683 acpi_status status; 684 685 if (!video->cap._DOS) 686 return 0; 687 688 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 689 return -EINVAL; 690 video->dos_setting = (lcd_flag << 2) | bios_flag; 691 status = acpi_execute_simple_method(video->device->handle, "_DOS", 692 (lcd_flag << 2) | bios_flag); 693 if (ACPI_FAILURE(status)) 694 return -EIO; 695 696 return 0; 697 } 698 699 /* 700 * Simple comparison function used to sort backlight levels. 701 */ 702 703 static int 704 acpi_video_cmp_level(const void *a, const void *b) 705 { 706 return *(int *)a - *(int *)b; 707 } 708 709 /* 710 * Decides if _BQC/_BCQ for this system is usable 711 * 712 * We do this by changing the level first and then read out the current 713 * brightness level, if the value does not match, find out if it is using 714 * index. If not, clear the _BQC/_BCQ capability. 715 */ 716 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 717 int max_level, int current_level) 718 { 719 struct acpi_video_device_brightness *br = device->brightness; 720 int result; 721 unsigned long long level; 722 int test_level; 723 724 /* don't mess with existing known broken systems */ 725 if (bqc_offset_aml_bug_workaround) 726 return 0; 727 728 /* 729 * Some systems always report current brightness level as maximum 730 * through _BQC, we need to test another value for them. However, 731 * there is a subtlety: 732 * 733 * If the _BCL package ordering is descending, the first level 734 * (br->levels[2]) is likely to be 0, and if the number of levels 735 * matches the number of steps, we might confuse a returned level to 736 * mean the index. 737 * 738 * For example: 739 * 740 * current_level = max_level = 100 741 * test_level = 0 742 * returned level = 100 743 * 744 * In this case 100 means the level, not the index, and _BCM failed. 745 * Still, if the _BCL package ordering is descending, the index of 746 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 747 * 748 * This causes all _BQC calls to return bogus values causing weird 749 * behavior from the user's perspective. For example: 750 * 751 * xbacklight -set 10; xbacklight -set 20; 752 * 753 * would flash to 90% and then slowly down to the desired level (20). 754 * 755 * The solution is simple; test anything other than the first level 756 * (e.g. 1). 757 */ 758 test_level = current_level == max_level 759 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 760 : max_level; 761 762 result = acpi_video_device_lcd_set_level(device, test_level); 763 if (result) 764 return result; 765 766 result = acpi_video_device_lcd_get_level_current(device, &level, true); 767 if (result) 768 return result; 769 770 if (level != test_level) { 771 /* buggy _BQC found, need to find out if it uses index */ 772 if (level < br->count) { 773 if (br->flags._BCL_reversed) 774 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 775 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 776 br->flags._BQC_use_index = 1; 777 } 778 779 if (!br->flags._BQC_use_index) 780 device->cap._BQC = device->cap._BCQ = 0; 781 } 782 783 return 0; 784 } 785 786 int acpi_video_get_levels(struct acpi_device *device, 787 struct acpi_video_device_brightness **dev_br, 788 int *pmax_level) 789 { 790 union acpi_object *obj = NULL; 791 int i, max_level = 0, count = 0, level_ac_battery = 0; 792 union acpi_object *o; 793 struct acpi_video_device_brightness *br = NULL; 794 int result = 0; 795 u32 value; 796 797 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle, 798 &obj))) { 799 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available " 800 "LCD brightness level\n")); 801 result = -ENODEV; 802 goto out; 803 } 804 805 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 806 result = -EINVAL; 807 goto out; 808 } 809 810 br = kzalloc(sizeof(*br), GFP_KERNEL); 811 if (!br) { 812 printk(KERN_ERR "can't allocate memory\n"); 813 result = -ENOMEM; 814 goto out; 815 } 816 817 /* 818 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 819 * in order to account for buggy BIOS which don't export the first two 820 * special levels (see below) 821 */ 822 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 823 sizeof(*br->levels), 824 GFP_KERNEL); 825 if (!br->levels) { 826 result = -ENOMEM; 827 goto out_free; 828 } 829 830 for (i = 0; i < obj->package.count; i++) { 831 o = (union acpi_object *)&obj->package.elements[i]; 832 if (o->type != ACPI_TYPE_INTEGER) { 833 printk(KERN_ERR PREFIX "Invalid data\n"); 834 continue; 835 } 836 value = (u32) o->integer.value; 837 /* Skip duplicate entries */ 838 if (count > ACPI_VIDEO_FIRST_LEVEL 839 && br->levels[count - 1] == value) 840 continue; 841 842 br->levels[count] = value; 843 844 if (br->levels[count] > max_level) 845 max_level = br->levels[count]; 846 count++; 847 } 848 849 /* 850 * some buggy BIOS don't export the levels 851 * when machine is on AC/Battery in _BCL package. 852 * In this case, the first two elements in _BCL packages 853 * are also supported brightness levels that OS should take care of. 854 */ 855 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 856 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 857 level_ac_battery++; 858 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 859 level_ac_battery++; 860 } 861 862 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 863 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 864 br->flags._BCL_no_ac_battery_levels = 1; 865 for (i = (count - 1 + level_ac_battery); 866 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 867 br->levels[i] = br->levels[i - level_ac_battery]; 868 count += level_ac_battery; 869 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 870 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package")); 871 872 /* Check if the _BCL package is in a reversed order */ 873 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 874 br->flags._BCL_reversed = 1; 875 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 876 count - ACPI_VIDEO_FIRST_LEVEL, 877 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 878 acpi_video_cmp_level, NULL); 879 } else if (max_level != br->levels[count - 1]) 880 ACPI_ERROR((AE_INFO, 881 "Found unordered _BCL package")); 882 883 br->count = count; 884 *dev_br = br; 885 if (pmax_level) 886 *pmax_level = max_level; 887 888 out: 889 kfree(obj); 890 return result; 891 out_free: 892 kfree(br); 893 goto out; 894 } 895 EXPORT_SYMBOL(acpi_video_get_levels); 896 897 /* 898 * Arg: 899 * device : video output device (LCD, CRT, ..) 900 * 901 * Return Value: 902 * Maximum brightness level 903 * 904 * Allocate and initialize device->brightness. 905 */ 906 907 static int 908 acpi_video_init_brightness(struct acpi_video_device *device) 909 { 910 int i, max_level = 0; 911 unsigned long long level, level_old; 912 struct acpi_video_device_brightness *br = NULL; 913 int result = -EINVAL; 914 915 result = acpi_video_get_levels(device->dev, &br, &max_level); 916 if (result) 917 return result; 918 device->brightness = br; 919 920 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 921 br->curr = level = max_level; 922 923 if (!device->cap._BQC) 924 goto set_level; 925 926 result = acpi_video_device_lcd_get_level_current(device, 927 &level_old, true); 928 if (result) 929 goto out_free_levels; 930 931 result = acpi_video_bqc_quirk(device, max_level, level_old); 932 if (result) 933 goto out_free_levels; 934 /* 935 * cap._BQC may get cleared due to _BQC is found to be broken 936 * in acpi_video_bqc_quirk, so check again here. 937 */ 938 if (!device->cap._BQC) 939 goto set_level; 940 941 level = acpi_video_bqc_value_to_level(device, level_old); 942 /* 943 * On some buggy laptops, _BQC returns an uninitialized 944 * value when invoked for the first time, i.e. 945 * level_old is invalid (no matter whether it's a level 946 * or an index). Set the backlight to max_level in this case. 947 */ 948 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 949 if (level == br->levels[i]) 950 break; 951 if (i == br->count || !level) 952 level = max_level; 953 954 set_level: 955 result = acpi_video_device_lcd_set_level(device, level); 956 if (result) 957 goto out_free_levels; 958 959 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 960 "found %d brightness levels\n", 961 br->count - ACPI_VIDEO_FIRST_LEVEL)); 962 return 0; 963 964 out_free_levels: 965 kfree(br->levels); 966 kfree(br); 967 device->brightness = NULL; 968 return result; 969 } 970 971 /* 972 * Arg: 973 * device : video output device (LCD, CRT, ..) 974 * 975 * Return Value: 976 * None 977 * 978 * Find out all required AML methods defined under the output 979 * device. 980 */ 981 982 static void acpi_video_device_find_cap(struct acpi_video_device *device) 983 { 984 if (acpi_has_method(device->dev->handle, "_ADR")) 985 device->cap._ADR = 1; 986 if (acpi_has_method(device->dev->handle, "_BCL")) 987 device->cap._BCL = 1; 988 if (acpi_has_method(device->dev->handle, "_BCM")) 989 device->cap._BCM = 1; 990 if (acpi_has_method(device->dev->handle, "_BQC")) { 991 device->cap._BQC = 1; 992 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 993 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n"); 994 device->cap._BCQ = 1; 995 } 996 997 if (acpi_has_method(device->dev->handle, "_DDC")) 998 device->cap._DDC = 1; 999 } 1000 1001 /* 1002 * Arg: 1003 * device : video output device (VGA) 1004 * 1005 * Return Value: 1006 * None 1007 * 1008 * Find out all required AML methods defined under the video bus device. 1009 */ 1010 1011 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1012 { 1013 if (acpi_has_method(video->device->handle, "_DOS")) 1014 video->cap._DOS = 1; 1015 if (acpi_has_method(video->device->handle, "_DOD")) 1016 video->cap._DOD = 1; 1017 if (acpi_has_method(video->device->handle, "_ROM")) 1018 video->cap._ROM = 1; 1019 if (acpi_has_method(video->device->handle, "_GPD")) 1020 video->cap._GPD = 1; 1021 if (acpi_has_method(video->device->handle, "_SPD")) 1022 video->cap._SPD = 1; 1023 if (acpi_has_method(video->device->handle, "_VPO")) 1024 video->cap._VPO = 1; 1025 } 1026 1027 /* 1028 * Check whether the video bus device has required AML method to 1029 * support the desired features 1030 */ 1031 1032 static int acpi_video_bus_check(struct acpi_video_bus *video) 1033 { 1034 acpi_status status = -ENOENT; 1035 struct pci_dev *dev; 1036 1037 if (!video) 1038 return -EINVAL; 1039 1040 dev = acpi_get_pci_dev(video->device->handle); 1041 if (!dev) 1042 return -ENODEV; 1043 pci_dev_put(dev); 1044 1045 /* 1046 * Since there is no HID, CID and so on for VGA driver, we have 1047 * to check well known required nodes. 1048 */ 1049 1050 /* Does this device support video switching? */ 1051 if (video->cap._DOS || video->cap._DOD) { 1052 if (!video->cap._DOS) { 1053 printk(KERN_WARNING FW_BUG 1054 "ACPI(%s) defines _DOD but not _DOS\n", 1055 acpi_device_bid(video->device)); 1056 } 1057 video->flags.multihead = 1; 1058 status = 0; 1059 } 1060 1061 /* Does this device support retrieving a video ROM? */ 1062 if (video->cap._ROM) { 1063 video->flags.rom = 1; 1064 status = 0; 1065 } 1066 1067 /* Does this device support configuring which video device to POST? */ 1068 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1069 video->flags.post = 1; 1070 status = 0; 1071 } 1072 1073 return status; 1074 } 1075 1076 /* 1077 * -------------------------------------------------------------------------- 1078 * Driver Interface 1079 * -------------------------------------------------------------------------- 1080 */ 1081 1082 /* device interface */ 1083 static struct acpi_video_device_attrib * 1084 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1085 { 1086 struct acpi_video_enumerated_device *ids; 1087 int i; 1088 1089 for (i = 0; i < video->attached_count; i++) { 1090 ids = &video->attached_array[i]; 1091 if ((ids->value.int_val & 0xffff) == device_id) 1092 return &ids->value.attrib; 1093 } 1094 1095 return NULL; 1096 } 1097 1098 static int 1099 acpi_video_get_device_type(struct acpi_video_bus *video, 1100 unsigned long device_id) 1101 { 1102 struct acpi_video_enumerated_device *ids; 1103 int i; 1104 1105 for (i = 0; i < video->attached_count; i++) { 1106 ids = &video->attached_array[i]; 1107 if ((ids->value.int_val & 0xffff) == device_id) 1108 return ids->value.int_val; 1109 } 1110 1111 return 0; 1112 } 1113 1114 static int 1115 acpi_video_bus_get_one_device(struct acpi_device *device, 1116 struct acpi_video_bus *video) 1117 { 1118 unsigned long long device_id; 1119 int status, device_type; 1120 struct acpi_video_device *data; 1121 struct acpi_video_device_attrib *attribute; 1122 1123 status = 1124 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1125 /* Some device omits _ADR, we skip them instead of fail */ 1126 if (ACPI_FAILURE(status)) 1127 return 0; 1128 1129 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1130 if (!data) 1131 return -ENOMEM; 1132 1133 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1134 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1135 device->driver_data = data; 1136 1137 data->device_id = device_id; 1138 data->video = video; 1139 data->dev = device; 1140 INIT_DELAYED_WORK(&data->switch_brightness_work, 1141 acpi_video_switch_brightness); 1142 1143 attribute = acpi_video_get_device_attr(video, device_id); 1144 1145 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1146 switch (attribute->display_type) { 1147 case ACPI_VIDEO_DISPLAY_CRT: 1148 data->flags.crt = 1; 1149 break; 1150 case ACPI_VIDEO_DISPLAY_TV: 1151 data->flags.tvout = 1; 1152 break; 1153 case ACPI_VIDEO_DISPLAY_DVI: 1154 data->flags.dvi = 1; 1155 break; 1156 case ACPI_VIDEO_DISPLAY_LCD: 1157 data->flags.lcd = 1; 1158 break; 1159 default: 1160 data->flags.unknown = 1; 1161 break; 1162 } 1163 if (attribute->bios_can_detect) 1164 data->flags.bios = 1; 1165 } else { 1166 /* Check for legacy IDs */ 1167 device_type = acpi_video_get_device_type(video, device_id); 1168 /* Ignore bits 16 and 18-20 */ 1169 switch (device_type & 0xffe2ffff) { 1170 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1171 data->flags.crt = 1; 1172 break; 1173 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1174 data->flags.lcd = 1; 1175 break; 1176 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1177 data->flags.tvout = 1; 1178 break; 1179 default: 1180 data->flags.unknown = 1; 1181 } 1182 } 1183 1184 acpi_video_device_bind(video, data); 1185 acpi_video_device_find_cap(data); 1186 1187 mutex_lock(&video->device_list_lock); 1188 list_add_tail(&data->entry, &video->video_device_list); 1189 mutex_unlock(&video->device_list_lock); 1190 1191 return status; 1192 } 1193 1194 /* 1195 * Arg: 1196 * video : video bus device 1197 * 1198 * Return: 1199 * none 1200 * 1201 * Enumerate the video device list of the video bus, 1202 * bind the ids with the corresponding video devices 1203 * under the video bus. 1204 */ 1205 1206 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1207 { 1208 struct acpi_video_device *dev; 1209 1210 mutex_lock(&video->device_list_lock); 1211 1212 list_for_each_entry(dev, &video->video_device_list, entry) 1213 acpi_video_device_bind(video, dev); 1214 1215 mutex_unlock(&video->device_list_lock); 1216 } 1217 1218 /* 1219 * Arg: 1220 * video : video bus device 1221 * device : video output device under the video 1222 * bus 1223 * 1224 * Return: 1225 * none 1226 * 1227 * Bind the ids with the corresponding video devices 1228 * under the video bus. 1229 */ 1230 1231 static void 1232 acpi_video_device_bind(struct acpi_video_bus *video, 1233 struct acpi_video_device *device) 1234 { 1235 struct acpi_video_enumerated_device *ids; 1236 int i; 1237 1238 for (i = 0; i < video->attached_count; i++) { 1239 ids = &video->attached_array[i]; 1240 if (device->device_id == (ids->value.int_val & 0xffff)) { 1241 ids->bind_info = device; 1242 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i)); 1243 } 1244 } 1245 } 1246 1247 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1248 { 1249 struct acpi_video_bus *video = device->video; 1250 int i; 1251 1252 /* 1253 * If we have a broken _DOD or we have more than 8 output devices 1254 * under the graphics controller node that we can't proper deal with 1255 * in the operation region code currently, no need to test. 1256 */ 1257 if (!video->attached_count || video->child_count > 8) 1258 return true; 1259 1260 for (i = 0; i < video->attached_count; i++) { 1261 if ((video->attached_array[i].value.int_val & 0xfff) == 1262 (device->device_id & 0xfff)) 1263 return true; 1264 } 1265 1266 return false; 1267 } 1268 1269 /* 1270 * Arg: 1271 * video : video bus device 1272 * 1273 * Return: 1274 * < 0 : error 1275 * 1276 * Call _DOD to enumerate all devices attached to display adapter 1277 * 1278 */ 1279 1280 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1281 { 1282 int status; 1283 int count; 1284 int i; 1285 struct acpi_video_enumerated_device *active_list; 1286 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1287 union acpi_object *dod = NULL; 1288 union acpi_object *obj; 1289 1290 if (!video->cap._DOD) 1291 return AE_NOT_EXIST; 1292 1293 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1294 if (!ACPI_SUCCESS(status)) { 1295 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD")); 1296 return status; 1297 } 1298 1299 dod = buffer.pointer; 1300 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1301 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data")); 1302 status = -EFAULT; 1303 goto out; 1304 } 1305 1306 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n", 1307 dod->package.count)); 1308 1309 active_list = kcalloc(1 + dod->package.count, 1310 sizeof(struct acpi_video_enumerated_device), 1311 GFP_KERNEL); 1312 if (!active_list) { 1313 status = -ENOMEM; 1314 goto out; 1315 } 1316 1317 count = 0; 1318 for (i = 0; i < dod->package.count; i++) { 1319 obj = &dod->package.elements[i]; 1320 1321 if (obj->type != ACPI_TYPE_INTEGER) { 1322 printk(KERN_ERR PREFIX 1323 "Invalid _DOD data in element %d\n", i); 1324 continue; 1325 } 1326 1327 active_list[count].value.int_val = obj->integer.value; 1328 active_list[count].bind_info = NULL; 1329 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, 1330 (int)obj->integer.value)); 1331 count++; 1332 } 1333 1334 kfree(video->attached_array); 1335 1336 video->attached_array = active_list; 1337 video->attached_count = count; 1338 1339 out: 1340 kfree(buffer.pointer); 1341 return status; 1342 } 1343 1344 static int 1345 acpi_video_get_next_level(struct acpi_video_device *device, 1346 u32 level_current, u32 event) 1347 { 1348 int min, max, min_above, max_below, i, l, delta = 255; 1349 max = max_below = 0; 1350 min = min_above = 255; 1351 /* Find closest level to level_current */ 1352 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1353 l = device->brightness->levels[i]; 1354 if (abs(l - level_current) < abs(delta)) { 1355 delta = l - level_current; 1356 if (!delta) 1357 break; 1358 } 1359 } 1360 /* Ajust level_current to closest available level */ 1361 level_current += delta; 1362 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1363 l = device->brightness->levels[i]; 1364 if (l < min) 1365 min = l; 1366 if (l > max) 1367 max = l; 1368 if (l < min_above && l > level_current) 1369 min_above = l; 1370 if (l > max_below && l < level_current) 1371 max_below = l; 1372 } 1373 1374 switch (event) { 1375 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1376 return (level_current < max) ? min_above : min; 1377 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1378 return (level_current < max) ? min_above : max; 1379 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1380 return (level_current > min) ? max_below : min; 1381 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1382 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1383 return 0; 1384 default: 1385 return level_current; 1386 } 1387 } 1388 1389 static void 1390 acpi_video_switch_brightness(struct work_struct *work) 1391 { 1392 struct acpi_video_device *device = container_of(to_delayed_work(work), 1393 struct acpi_video_device, switch_brightness_work); 1394 unsigned long long level_current, level_next; 1395 int event = device->switch_brightness_event; 1396 int result = -EINVAL; 1397 1398 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1399 if (!device->backlight) 1400 return; 1401 1402 if (!device->brightness) 1403 goto out; 1404 1405 result = acpi_video_device_lcd_get_level_current(device, 1406 &level_current, 1407 false); 1408 if (result) 1409 goto out; 1410 1411 level_next = acpi_video_get_next_level(device, level_current, event); 1412 1413 result = acpi_video_device_lcd_set_level(device, level_next); 1414 1415 if (!result) 1416 backlight_force_update(device->backlight, 1417 BACKLIGHT_UPDATE_HOTKEY); 1418 1419 out: 1420 if (result) 1421 printk(KERN_ERR PREFIX "Failed to switch the brightness\n"); 1422 } 1423 1424 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1425 void **edid) 1426 { 1427 struct acpi_video_bus *video; 1428 struct acpi_video_device *video_device; 1429 union acpi_object *buffer = NULL; 1430 acpi_status status; 1431 int i, length; 1432 1433 if (!device || !acpi_driver_data(device)) 1434 return -EINVAL; 1435 1436 video = acpi_driver_data(device); 1437 1438 for (i = 0; i < video->attached_count; i++) { 1439 video_device = video->attached_array[i].bind_info; 1440 length = 256; 1441 1442 if (!video_device) 1443 continue; 1444 1445 if (!video_device->cap._DDC) 1446 continue; 1447 1448 if (type) { 1449 switch (type) { 1450 case ACPI_VIDEO_DISPLAY_CRT: 1451 if (!video_device->flags.crt) 1452 continue; 1453 break; 1454 case ACPI_VIDEO_DISPLAY_TV: 1455 if (!video_device->flags.tvout) 1456 continue; 1457 break; 1458 case ACPI_VIDEO_DISPLAY_DVI: 1459 if (!video_device->flags.dvi) 1460 continue; 1461 break; 1462 case ACPI_VIDEO_DISPLAY_LCD: 1463 if (!video_device->flags.lcd) 1464 continue; 1465 break; 1466 } 1467 } else if (video_device->device_id != device_id) { 1468 continue; 1469 } 1470 1471 status = acpi_video_device_EDID(video_device, &buffer, length); 1472 1473 if (ACPI_FAILURE(status) || !buffer || 1474 buffer->type != ACPI_TYPE_BUFFER) { 1475 length = 128; 1476 status = acpi_video_device_EDID(video_device, &buffer, 1477 length); 1478 if (ACPI_FAILURE(status) || !buffer || 1479 buffer->type != ACPI_TYPE_BUFFER) { 1480 continue; 1481 } 1482 } 1483 1484 *edid = buffer->buffer.pointer; 1485 return length; 1486 } 1487 1488 return -ENODEV; 1489 } 1490 EXPORT_SYMBOL(acpi_video_get_edid); 1491 1492 static int 1493 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1494 struct acpi_device *device) 1495 { 1496 int status = 0; 1497 struct acpi_device *dev; 1498 1499 /* 1500 * There are systems where video module known to work fine regardless 1501 * of broken _DOD and ignoring returned value here doesn't cause 1502 * any issues later. 1503 */ 1504 acpi_video_device_enumerate(video); 1505 1506 list_for_each_entry(dev, &device->children, node) { 1507 1508 status = acpi_video_bus_get_one_device(dev, video); 1509 if (status) { 1510 dev_err(&dev->dev, "Can't attach device\n"); 1511 break; 1512 } 1513 video->child_count++; 1514 } 1515 return status; 1516 } 1517 1518 /* acpi_video interface */ 1519 1520 /* 1521 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1522 * preform any automatic brightness change on receiving a notification. 1523 */ 1524 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1525 { 1526 return acpi_video_bus_DOS(video, 0, 1527 acpi_osi_is_win8() ? 1 : 0); 1528 } 1529 1530 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1531 { 1532 return acpi_video_bus_DOS(video, 0, 1533 acpi_osi_is_win8() ? 0 : 1); 1534 } 1535 1536 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1537 { 1538 struct acpi_video_bus *video = acpi_driver_data(device); 1539 struct input_dev *input; 1540 int keycode = 0; 1541 1542 if (!video || !video->input) 1543 return; 1544 1545 input = video->input; 1546 1547 switch (event) { 1548 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1549 * most likely via hotkey. */ 1550 keycode = KEY_SWITCHVIDEOMODE; 1551 break; 1552 1553 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1554 * connector. */ 1555 acpi_video_device_enumerate(video); 1556 acpi_video_device_rebind(video); 1557 keycode = KEY_SWITCHVIDEOMODE; 1558 break; 1559 1560 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1561 keycode = KEY_SWITCHVIDEOMODE; 1562 break; 1563 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1564 keycode = KEY_VIDEO_NEXT; 1565 break; 1566 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1567 keycode = KEY_VIDEO_PREV; 1568 break; 1569 1570 default: 1571 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1572 "Unsupported event [0x%x]\n", event)); 1573 break; 1574 } 1575 1576 if (acpi_notifier_call_chain(device, event, 0)) 1577 /* Something vetoed the keypress. */ 1578 keycode = 0; 1579 1580 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1581 input_report_key(input, keycode, 1); 1582 input_sync(input); 1583 input_report_key(input, keycode, 0); 1584 input_sync(input); 1585 } 1586 1587 return; 1588 } 1589 1590 static void brightness_switch_event(struct acpi_video_device *video_device, 1591 u32 event) 1592 { 1593 if (!brightness_switch_enabled) 1594 return; 1595 1596 video_device->switch_brightness_event = event; 1597 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1598 } 1599 1600 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1601 { 1602 struct acpi_video_device *video_device = data; 1603 struct acpi_device *device = NULL; 1604 struct acpi_video_bus *bus; 1605 struct input_dev *input; 1606 int keycode = 0; 1607 1608 if (!video_device) 1609 return; 1610 1611 device = video_device->dev; 1612 bus = video_device->video; 1613 input = bus->input; 1614 1615 switch (event) { 1616 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1617 brightness_switch_event(video_device, event); 1618 keycode = KEY_BRIGHTNESS_CYCLE; 1619 break; 1620 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1621 brightness_switch_event(video_device, event); 1622 keycode = KEY_BRIGHTNESSUP; 1623 break; 1624 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1625 brightness_switch_event(video_device, event); 1626 keycode = KEY_BRIGHTNESSDOWN; 1627 break; 1628 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1629 brightness_switch_event(video_device, event); 1630 keycode = KEY_BRIGHTNESS_ZERO; 1631 break; 1632 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1633 brightness_switch_event(video_device, event); 1634 keycode = KEY_DISPLAY_OFF; 1635 break; 1636 default: 1637 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1638 "Unsupported event [0x%x]\n", event)); 1639 break; 1640 } 1641 1642 acpi_notifier_call_chain(device, event, 0); 1643 1644 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1645 input_report_key(input, keycode, 1); 1646 input_sync(input); 1647 input_report_key(input, keycode, 0); 1648 input_sync(input); 1649 } 1650 1651 return; 1652 } 1653 1654 static int acpi_video_resume(struct notifier_block *nb, 1655 unsigned long val, void *ign) 1656 { 1657 struct acpi_video_bus *video; 1658 struct acpi_video_device *video_device; 1659 int i; 1660 1661 switch (val) { 1662 case PM_HIBERNATION_PREPARE: 1663 case PM_SUSPEND_PREPARE: 1664 case PM_RESTORE_PREPARE: 1665 return NOTIFY_DONE; 1666 } 1667 1668 video = container_of(nb, struct acpi_video_bus, pm_nb); 1669 1670 dev_info(&video->device->dev, "Restoring backlight state\n"); 1671 1672 for (i = 0; i < video->attached_count; i++) { 1673 video_device = video->attached_array[i].bind_info; 1674 if (video_device && video_device->brightness) 1675 acpi_video_device_lcd_set_level(video_device, 1676 video_device->brightness->curr); 1677 } 1678 1679 return NOTIFY_OK; 1680 } 1681 1682 static acpi_status 1683 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1684 void **return_value) 1685 { 1686 struct acpi_device *device = context; 1687 struct acpi_device *sibling; 1688 int result; 1689 1690 if (handle == device->handle) 1691 return AE_CTRL_TERMINATE; 1692 1693 result = acpi_bus_get_device(handle, &sibling); 1694 if (result) 1695 return AE_OK; 1696 1697 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1698 return AE_ALREADY_EXISTS; 1699 1700 return AE_OK; 1701 } 1702 1703 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1704 { 1705 struct backlight_properties props; 1706 struct pci_dev *pdev; 1707 acpi_handle acpi_parent; 1708 struct device *parent = NULL; 1709 int result; 1710 static int count; 1711 char *name; 1712 1713 result = acpi_video_init_brightness(device); 1714 if (result) 1715 return; 1716 1717 if (disable_backlight_sysfs_if > 0) 1718 return; 1719 1720 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1721 if (!name) 1722 return; 1723 count++; 1724 1725 acpi_get_parent(device->dev->handle, &acpi_parent); 1726 1727 pdev = acpi_get_pci_dev(acpi_parent); 1728 if (pdev) { 1729 parent = &pdev->dev; 1730 pci_dev_put(pdev); 1731 } 1732 1733 memset(&props, 0, sizeof(struct backlight_properties)); 1734 props.type = BACKLIGHT_FIRMWARE; 1735 props.max_brightness = 1736 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1737 device->backlight = backlight_device_register(name, 1738 parent, 1739 device, 1740 &acpi_backlight_ops, 1741 &props); 1742 kfree(name); 1743 if (IS_ERR(device->backlight)) { 1744 device->backlight = NULL; 1745 return; 1746 } 1747 1748 /* 1749 * Save current brightness level in case we have to restore it 1750 * before acpi_video_device_lcd_set_level() is called next time. 1751 */ 1752 device->backlight->props.brightness = 1753 acpi_video_get_brightness(device->backlight); 1754 1755 device->cooling_dev = thermal_cooling_device_register("LCD", 1756 device->dev, &video_cooling_ops); 1757 if (IS_ERR(device->cooling_dev)) { 1758 /* 1759 * Set cooling_dev to NULL so we don't crash trying to free it. 1760 * Also, why the hell we are returning early and not attempt to 1761 * register video output if cooling device registration failed? 1762 * -- dtor 1763 */ 1764 device->cooling_dev = NULL; 1765 return; 1766 } 1767 1768 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1769 device->cooling_dev->id); 1770 result = sysfs_create_link(&device->dev->dev.kobj, 1771 &device->cooling_dev->device.kobj, 1772 "thermal_cooling"); 1773 if (result) 1774 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1775 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1776 &device->dev->dev.kobj, "device"); 1777 if (result) 1778 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1779 } 1780 1781 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1782 { 1783 struct acpi_video_device *dev; 1784 union acpi_object *levels; 1785 1786 mutex_lock(&video->device_list_lock); 1787 list_for_each_entry(dev, &video->video_device_list, entry) { 1788 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1789 kfree(levels); 1790 } 1791 mutex_unlock(&video->device_list_lock); 1792 } 1793 1794 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1795 { 1796 /* 1797 * Do not create backlight device for video output 1798 * device that is not in the enumerated list. 1799 */ 1800 if (!acpi_video_device_in_dod(dev)) { 1801 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1802 return false; 1803 } 1804 1805 if (only_lcd) 1806 return dev->flags.lcd; 1807 return true; 1808 } 1809 1810 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1811 { 1812 struct acpi_video_device *dev; 1813 1814 if (video->backlight_registered) 1815 return 0; 1816 1817 acpi_video_run_bcl_for_osi(video); 1818 1819 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1820 return 0; 1821 1822 mutex_lock(&video->device_list_lock); 1823 list_for_each_entry(dev, &video->video_device_list, entry) { 1824 if (acpi_video_should_register_backlight(dev)) 1825 acpi_video_dev_register_backlight(dev); 1826 } 1827 mutex_unlock(&video->device_list_lock); 1828 1829 video->backlight_registered = true; 1830 1831 video->pm_nb.notifier_call = acpi_video_resume; 1832 video->pm_nb.priority = 0; 1833 return register_pm_notifier(&video->pm_nb); 1834 } 1835 1836 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1837 { 1838 if (device->backlight) { 1839 backlight_device_unregister(device->backlight); 1840 device->backlight = NULL; 1841 } 1842 if (device->brightness) { 1843 kfree(device->brightness->levels); 1844 kfree(device->brightness); 1845 device->brightness = NULL; 1846 } 1847 if (device->cooling_dev) { 1848 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1849 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1850 thermal_cooling_device_unregister(device->cooling_dev); 1851 device->cooling_dev = NULL; 1852 } 1853 } 1854 1855 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1856 { 1857 struct acpi_video_device *dev; 1858 int error; 1859 1860 if (!video->backlight_registered) 1861 return 0; 1862 1863 error = unregister_pm_notifier(&video->pm_nb); 1864 1865 mutex_lock(&video->device_list_lock); 1866 list_for_each_entry(dev, &video->video_device_list, entry) 1867 acpi_video_dev_unregister_backlight(dev); 1868 mutex_unlock(&video->device_list_lock); 1869 1870 video->backlight_registered = false; 1871 1872 return error; 1873 } 1874 1875 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1876 { 1877 acpi_status status; 1878 struct acpi_device *adev = device->dev; 1879 1880 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1881 acpi_video_device_notify, device); 1882 if (ACPI_FAILURE(status)) 1883 dev_err(&adev->dev, "Error installing notify handler\n"); 1884 else 1885 device->flags.notify = 1; 1886 } 1887 1888 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1889 { 1890 struct input_dev *input; 1891 struct acpi_video_device *dev; 1892 int error; 1893 1894 video->input = input = input_allocate_device(); 1895 if (!input) { 1896 error = -ENOMEM; 1897 goto out; 1898 } 1899 1900 error = acpi_video_bus_start_devices(video); 1901 if (error) 1902 goto err_free_input; 1903 1904 snprintf(video->phys, sizeof(video->phys), 1905 "%s/video/input0", acpi_device_hid(video->device)); 1906 1907 input->name = acpi_device_name(video->device); 1908 input->phys = video->phys; 1909 input->id.bustype = BUS_HOST; 1910 input->id.product = 0x06; 1911 input->dev.parent = &video->device->dev; 1912 input->evbit[0] = BIT(EV_KEY); 1913 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1914 set_bit(KEY_VIDEO_NEXT, input->keybit); 1915 set_bit(KEY_VIDEO_PREV, input->keybit); 1916 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1917 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1918 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1919 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1920 set_bit(KEY_DISPLAY_OFF, input->keybit); 1921 1922 error = input_register_device(input); 1923 if (error) 1924 goto err_stop_dev; 1925 1926 mutex_lock(&video->device_list_lock); 1927 list_for_each_entry(dev, &video->video_device_list, entry) 1928 acpi_video_dev_add_notify_handler(dev); 1929 mutex_unlock(&video->device_list_lock); 1930 1931 return 0; 1932 1933 err_stop_dev: 1934 acpi_video_bus_stop_devices(video); 1935 err_free_input: 1936 input_free_device(input); 1937 video->input = NULL; 1938 out: 1939 return error; 1940 } 1941 1942 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1943 { 1944 if (dev->flags.notify) { 1945 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1946 acpi_video_device_notify); 1947 dev->flags.notify = 0; 1948 } 1949 } 1950 1951 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1952 { 1953 struct acpi_video_device *dev; 1954 1955 mutex_lock(&video->device_list_lock); 1956 list_for_each_entry(dev, &video->video_device_list, entry) 1957 acpi_video_dev_remove_notify_handler(dev); 1958 mutex_unlock(&video->device_list_lock); 1959 1960 acpi_video_bus_stop_devices(video); 1961 input_unregister_device(video->input); 1962 video->input = NULL; 1963 } 1964 1965 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1966 { 1967 struct acpi_video_device *dev, *next; 1968 1969 mutex_lock(&video->device_list_lock); 1970 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1971 list_del(&dev->entry); 1972 kfree(dev); 1973 } 1974 mutex_unlock(&video->device_list_lock); 1975 1976 return 0; 1977 } 1978 1979 static int instance; 1980 1981 static int acpi_video_bus_add(struct acpi_device *device) 1982 { 1983 struct acpi_video_bus *video; 1984 int error; 1985 acpi_status status; 1986 1987 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1988 device->parent->handle, 1, 1989 acpi_video_bus_match, NULL, 1990 device, NULL); 1991 if (status == AE_ALREADY_EXISTS) { 1992 printk(KERN_WARNING FW_BUG 1993 "Duplicate ACPI video bus devices for the" 1994 " same VGA controller, please try module " 1995 "parameter \"video.allow_duplicates=1\"" 1996 "if the current driver doesn't work.\n"); 1997 if (!allow_duplicates) 1998 return -ENODEV; 1999 } 2000 2001 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2002 if (!video) 2003 return -ENOMEM; 2004 2005 /* a hack to fix the duplicate name "VID" problem on T61 */ 2006 if (!strcmp(device->pnp.bus_id, "VID")) { 2007 if (instance) 2008 device->pnp.bus_id[3] = '0' + instance; 2009 instance++; 2010 } 2011 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2012 if (!strcmp(device->pnp.bus_id, "VGA")) { 2013 if (instance) 2014 device->pnp.bus_id[3] = '0' + instance; 2015 instance++; 2016 } 2017 2018 video->device = device; 2019 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2020 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2021 device->driver_data = video; 2022 2023 acpi_video_bus_find_cap(video); 2024 error = acpi_video_bus_check(video); 2025 if (error) 2026 goto err_free_video; 2027 2028 mutex_init(&video->device_list_lock); 2029 INIT_LIST_HEAD(&video->video_device_list); 2030 2031 error = acpi_video_bus_get_devices(video, device); 2032 if (error) 2033 goto err_put_video; 2034 2035 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n", 2036 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2037 video->flags.multihead ? "yes" : "no", 2038 video->flags.rom ? "yes" : "no", 2039 video->flags.post ? "yes" : "no"); 2040 mutex_lock(&video_list_lock); 2041 list_add_tail(&video->entry, &video_bus_head); 2042 mutex_unlock(&video_list_lock); 2043 2044 acpi_video_bus_register_backlight(video); 2045 acpi_video_bus_add_notify_handler(video); 2046 2047 return 0; 2048 2049 err_put_video: 2050 acpi_video_bus_put_devices(video); 2051 kfree(video->attached_array); 2052 err_free_video: 2053 kfree(video); 2054 device->driver_data = NULL; 2055 2056 return error; 2057 } 2058 2059 static int acpi_video_bus_remove(struct acpi_device *device) 2060 { 2061 struct acpi_video_bus *video = NULL; 2062 2063 2064 if (!device || !acpi_driver_data(device)) 2065 return -EINVAL; 2066 2067 video = acpi_driver_data(device); 2068 2069 acpi_video_bus_remove_notify_handler(video); 2070 acpi_video_bus_unregister_backlight(video); 2071 acpi_video_bus_put_devices(video); 2072 2073 mutex_lock(&video_list_lock); 2074 list_del(&video->entry); 2075 mutex_unlock(&video_list_lock); 2076 2077 kfree(video->attached_array); 2078 kfree(video); 2079 2080 return 0; 2081 } 2082 2083 static int __init is_i740(struct pci_dev *dev) 2084 { 2085 if (dev->device == 0x00D1) 2086 return 1; 2087 if (dev->device == 0x7000) 2088 return 1; 2089 return 0; 2090 } 2091 2092 static int __init intel_opregion_present(void) 2093 { 2094 int opregion = 0; 2095 struct pci_dev *dev = NULL; 2096 u32 address; 2097 2098 for_each_pci_dev(dev) { 2099 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2100 continue; 2101 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2102 continue; 2103 /* We don't want to poke around undefined i740 registers */ 2104 if (is_i740(dev)) 2105 continue; 2106 pci_read_config_dword(dev, 0xfc, &address); 2107 if (!address) 2108 continue; 2109 opregion = 1; 2110 } 2111 return opregion; 2112 } 2113 2114 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2115 static bool dmi_is_desktop(void) 2116 { 2117 const char *chassis_type; 2118 unsigned long type; 2119 2120 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2121 if (!chassis_type) 2122 return false; 2123 2124 if (kstrtoul(chassis_type, 10, &type) != 0) 2125 return false; 2126 2127 switch (type) { 2128 case 0x03: /* Desktop */ 2129 case 0x04: /* Low Profile Desktop */ 2130 case 0x05: /* Pizza Box */ 2131 case 0x06: /* Mini Tower */ 2132 case 0x07: /* Tower */ 2133 case 0x10: /* Lunch Box */ 2134 case 0x11: /* Main Server Chassis */ 2135 return true; 2136 } 2137 2138 return false; 2139 } 2140 2141 int acpi_video_register(void) 2142 { 2143 int ret = 0; 2144 2145 mutex_lock(®ister_count_mutex); 2146 if (register_count) { 2147 /* 2148 * if the function of acpi_video_register is already called, 2149 * don't register the acpi_vide_bus again and return no error. 2150 */ 2151 goto leave; 2152 } 2153 2154 /* 2155 * We're seeing a lot of bogus backlight interfaces on newer machines 2156 * without a LCD such as desktops, servers and HDMI sticks. Checking 2157 * the lcd flag fixes this, so enable this on any machines which are 2158 * win8 ready (where we also prefer the native backlight driver, so 2159 * normally the acpi_video code should not register there anyways). 2160 */ 2161 if (only_lcd == -1) { 2162 if (dmi_is_desktop() && acpi_osi_is_win8()) 2163 only_lcd = true; 2164 else 2165 only_lcd = false; 2166 } 2167 2168 dmi_check_system(video_dmi_table); 2169 2170 ret = acpi_bus_register_driver(&acpi_video_bus); 2171 if (ret) 2172 goto leave; 2173 2174 /* 2175 * When the acpi_video_bus is loaded successfully, increase 2176 * the counter reference. 2177 */ 2178 register_count = 1; 2179 2180 leave: 2181 mutex_unlock(®ister_count_mutex); 2182 return ret; 2183 } 2184 EXPORT_SYMBOL(acpi_video_register); 2185 2186 void acpi_video_unregister(void) 2187 { 2188 mutex_lock(®ister_count_mutex); 2189 if (register_count) { 2190 acpi_bus_unregister_driver(&acpi_video_bus); 2191 register_count = 0; 2192 } 2193 mutex_unlock(®ister_count_mutex); 2194 } 2195 EXPORT_SYMBOL(acpi_video_unregister); 2196 2197 void acpi_video_unregister_backlight(void) 2198 { 2199 struct acpi_video_bus *video; 2200 2201 mutex_lock(®ister_count_mutex); 2202 if (register_count) { 2203 mutex_lock(&video_list_lock); 2204 list_for_each_entry(video, &video_bus_head, entry) 2205 acpi_video_bus_unregister_backlight(video); 2206 mutex_unlock(&video_list_lock); 2207 } 2208 mutex_unlock(®ister_count_mutex); 2209 } 2210 2211 bool acpi_video_handles_brightness_key_presses(void) 2212 { 2213 bool have_video_busses; 2214 2215 mutex_lock(&video_list_lock); 2216 have_video_busses = !list_empty(&video_bus_head); 2217 mutex_unlock(&video_list_lock); 2218 2219 return have_video_busses && 2220 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2221 } 2222 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2223 2224 /* 2225 * This is kind of nasty. Hardware using Intel chipsets may require 2226 * the video opregion code to be run first in order to initialise 2227 * state before any ACPI video calls are made. To handle this we defer 2228 * registration of the video class until the opregion code has run. 2229 */ 2230 2231 static int __init acpi_video_init(void) 2232 { 2233 /* 2234 * Let the module load even if ACPI is disabled (e.g. due to 2235 * a broken BIOS) so that i915.ko can still be loaded on such 2236 * old systems without an AcpiOpRegion. 2237 * 2238 * acpi_video_register() will report -ENODEV later as well due 2239 * to acpi_disabled when i915.ko tries to register itself afterwards. 2240 */ 2241 if (acpi_disabled) 2242 return 0; 2243 2244 if (intel_opregion_present()) 2245 return 0; 2246 2247 return acpi_video_register(); 2248 } 2249 2250 static void __exit acpi_video_exit(void) 2251 { 2252 acpi_video_detect_exit(); 2253 acpi_video_unregister(); 2254 2255 return; 2256 } 2257 2258 module_init(acpi_video_init); 2259 module_exit(acpi_video_exit); 2260