1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * video.c - ACPI Video Driver 4 * 5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> 6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org> 7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net> 8 */ 9 10 #define pr_fmt(fmt) "ACPI: video: " fmt 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/types.h> 16 #include <linux/list.h> 17 #include <linux/mutex.h> 18 #include <linux/input.h> 19 #include <linux/backlight.h> 20 #include <linux/thermal.h> 21 #include <linux/sort.h> 22 #include <linux/pci.h> 23 #include <linux/pci_ids.h> 24 #include <linux/slab.h> 25 #include <linux/dmi.h> 26 #include <linux/suspend.h> 27 #include <linux/acpi.h> 28 #include <acpi/video.h> 29 #include <linux/uaccess.h> 30 31 #define ACPI_VIDEO_BUS_NAME "Video Bus" 32 #define ACPI_VIDEO_DEVICE_NAME "Video Device" 33 34 #define MAX_NAME_LEN 20 35 36 MODULE_AUTHOR("Bruno Ducrot"); 37 MODULE_DESCRIPTION("ACPI Video Driver"); 38 MODULE_LICENSE("GPL"); 39 40 static bool brightness_switch_enabled = true; 41 module_param(brightness_switch_enabled, bool, 0644); 42 43 /* 44 * By default, we don't allow duplicate ACPI video bus devices 45 * under the same VGA controller 46 */ 47 static bool allow_duplicates; 48 module_param(allow_duplicates, bool, 0644); 49 50 #define REPORT_OUTPUT_KEY_EVENTS 0x01 51 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 52 static int report_key_events = -1; 53 module_param(report_key_events, int, 0644); 54 MODULE_PARM_DESC(report_key_events, 55 "0: none, 1: output changes, 2: brightness changes, 3: all"); 56 57 static int hw_changes_brightness = -1; 58 module_param(hw_changes_brightness, int, 0644); 59 MODULE_PARM_DESC(hw_changes_brightness, 60 "Set this to 1 on buggy hw which changes the brightness itself when " 61 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); 62 63 /* 64 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 65 * assumed even if not actually set. 66 */ 67 static bool device_id_scheme = false; 68 module_param(device_id_scheme, bool, 0444); 69 70 static int only_lcd = -1; 71 module_param(only_lcd, int, 0444); 72 73 static bool may_report_brightness_keys; 74 static int register_count; 75 static DEFINE_MUTEX(register_count_mutex); 76 static DEFINE_MUTEX(video_list_lock); 77 static LIST_HEAD(video_bus_head); 78 static int acpi_video_bus_add(struct acpi_device *device); 79 static void acpi_video_bus_remove(struct acpi_device *device); 80 static void acpi_video_bus_notify(struct acpi_device *device, u32 event); 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_FAILURE(status)) 324 return status; 325 obj = (union acpi_object *)buffer.pointer; 326 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 327 acpi_handle_info(handle, "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_handle_info(device->dev->handle, "_BCM evaluation failed\n"); 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_handle_info(device->dev->handle, "Current brightness invalid\n"); 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_set_device_id_scheme(const struct dmi_system_id *d) 382 { 383 device_id_scheme = true; 384 return 0; 385 } 386 387 static int video_enable_only_lcd(const struct dmi_system_id *d) 388 { 389 only_lcd = true; 390 return 0; 391 } 392 393 static int video_set_report_key_events(const struct dmi_system_id *id) 394 { 395 if (report_key_events == -1) 396 report_key_events = (uintptr_t)id->driver_data; 397 return 0; 398 } 399 400 static int video_hw_changes_brightness( 401 const struct dmi_system_id *d) 402 { 403 if (hw_changes_brightness == -1) 404 hw_changes_brightness = 1; 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 machine's _DOD IDs don't have bit 31(Device ID Scheme) set 455 * but the IDs actually follow the Device ID Scheme. 456 */ 457 { 458 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 459 .callback = video_set_device_id_scheme, 460 .ident = "ESPRIMO Mobile M9410", 461 .matches = { 462 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 463 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 464 }, 465 }, 466 /* 467 * Some machines have multiple video output devices, but only the one 468 * that is the type of LCD can do the backlight control so we should not 469 * register backlight interface for other video output devices. 470 */ 471 { 472 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 473 .callback = video_enable_only_lcd, 474 .ident = "ESPRIMO Mobile M9410", 475 .matches = { 476 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 477 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 478 }, 479 }, 480 /* 481 * Some machines report wrong key events on the acpi-bus, suppress 482 * key event reporting on these. Note this is only intended to work 483 * around events which are plain wrong. In some cases we get double 484 * events, in this case acpi-video is considered the canonical source 485 * and the events from the other source should be filtered. E.g. 486 * by calling acpi_video_handles_brightness_key_presses() from the 487 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 488 */ 489 { 490 .callback = video_set_report_key_events, 491 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 492 .ident = "Dell Vostro V131", 493 .matches = { 494 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 495 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 496 }, 497 }, 498 { 499 .callback = video_set_report_key_events, 500 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 501 .ident = "Dell Vostro 3350", 502 .matches = { 503 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 504 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), 505 }, 506 }, 507 /* 508 * Some machines change the brightness themselves when a brightness 509 * hotkey gets pressed, despite us telling them not to. In this case 510 * acpi_video_device_notify() should only call backlight_force_update( 511 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 512 */ 513 { 514 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 515 .callback = video_hw_changes_brightness, 516 .ident = "Packard Bell EasyNote MZ35", 517 .matches = { 518 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 519 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 520 }, 521 }, 522 {} 523 }; 524 525 static unsigned long long 526 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 527 unsigned long long bqc_value) 528 { 529 unsigned long long level; 530 531 if (device->brightness->flags._BQC_use_index) { 532 /* 533 * _BQC returns an index that doesn't account for the first 2 534 * items with special meaning (see enum acpi_video_level_idx), 535 * so we need to compensate for that by offsetting ourselves 536 */ 537 if (device->brightness->flags._BCL_reversed) 538 bqc_value = device->brightness->count - 539 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 540 541 level = device->brightness->levels[bqc_value + 542 ACPI_VIDEO_FIRST_LEVEL]; 543 } else { 544 level = bqc_value; 545 } 546 547 level += bqc_offset_aml_bug_workaround; 548 549 return level; 550 } 551 552 static int 553 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 554 unsigned long long *level, bool raw) 555 { 556 acpi_status status = AE_OK; 557 int i; 558 559 if (device->cap._BQC || device->cap._BCQ) { 560 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 561 562 status = acpi_evaluate_integer(device->dev->handle, buf, 563 NULL, level); 564 if (ACPI_SUCCESS(status)) { 565 if (raw) { 566 /* 567 * Caller has indicated he wants the raw 568 * value returned by _BQC, so don't furtherly 569 * mess with the value. 570 */ 571 return 0; 572 } 573 574 *level = acpi_video_bqc_value_to_level(device, *level); 575 576 for (i = ACPI_VIDEO_FIRST_LEVEL; 577 i < device->brightness->count; i++) 578 if (device->brightness->levels[i] == *level) { 579 device->brightness->curr = *level; 580 return 0; 581 } 582 /* 583 * BQC returned an invalid level. 584 * Stop using it. 585 */ 586 acpi_handle_info(device->dev->handle, 587 "%s returned an invalid level", buf); 588 device->cap._BQC = device->cap._BCQ = 0; 589 } else { 590 /* 591 * Fixme: 592 * should we return an error or ignore this failure? 593 * dev->brightness->curr is a cached value which stores 594 * the correct current backlight level in most cases. 595 * ACPI video backlight still works w/ buggy _BQC. 596 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 597 */ 598 acpi_handle_info(device->dev->handle, 599 "%s evaluation failed", buf); 600 device->cap._BQC = device->cap._BCQ = 0; 601 } 602 } 603 604 *level = device->brightness->curr; 605 return 0; 606 } 607 608 static int 609 acpi_video_device_EDID(struct acpi_video_device *device, 610 union acpi_object **edid, ssize_t length) 611 { 612 int status; 613 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 614 union acpi_object *obj; 615 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 616 struct acpi_object_list args = { 1, &arg0 }; 617 618 619 *edid = NULL; 620 621 if (!device) 622 return -ENODEV; 623 if (length == 128) 624 arg0.integer.value = 1; 625 else if (length == 256) 626 arg0.integer.value = 2; 627 else 628 return -EINVAL; 629 630 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 631 if (ACPI_FAILURE(status)) 632 return -ENODEV; 633 634 obj = buffer.pointer; 635 636 if (obj && obj->type == ACPI_TYPE_BUFFER) 637 *edid = obj; 638 else { 639 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); 640 status = -EFAULT; 641 kfree(obj); 642 } 643 644 return status; 645 } 646 647 /* bus */ 648 649 /* 650 * Arg: 651 * video : video bus device pointer 652 * bios_flag : 653 * 0. The system BIOS should NOT automatically switch(toggle) 654 * the active display output. 655 * 1. The system BIOS should automatically switch (toggle) the 656 * active display output. No switch event. 657 * 2. The _DGS value should be locked. 658 * 3. The system BIOS should not automatically switch (toggle) the 659 * active display output, but instead generate the display switch 660 * event notify code. 661 * lcd_flag : 662 * 0. The system BIOS should automatically control the brightness level 663 * of the LCD when: 664 * - the power changes from AC to DC (ACPI appendix B) 665 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 666 * 1. The system BIOS should NOT automatically control the brightness 667 * level of the LCD when: 668 * - the power changes from AC to DC (ACPI appendix B) 669 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 670 * Return Value: 671 * -EINVAL wrong arg. 672 */ 673 674 static int 675 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 676 { 677 acpi_status status; 678 679 if (!video->cap._DOS) 680 return 0; 681 682 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 683 return -EINVAL; 684 video->dos_setting = (lcd_flag << 2) | bios_flag; 685 status = acpi_execute_simple_method(video->device->handle, "_DOS", 686 (lcd_flag << 2) | bios_flag); 687 if (ACPI_FAILURE(status)) 688 return -EIO; 689 690 return 0; 691 } 692 693 /* 694 * Simple comparison function used to sort backlight levels. 695 */ 696 697 static int 698 acpi_video_cmp_level(const void *a, const void *b) 699 { 700 return *(int *)a - *(int *)b; 701 } 702 703 /* 704 * Decides if _BQC/_BCQ for this system is usable 705 * 706 * We do this by changing the level first and then read out the current 707 * brightness level, if the value does not match, find out if it is using 708 * index. If not, clear the _BQC/_BCQ capability. 709 */ 710 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 711 int max_level, int current_level) 712 { 713 struct acpi_video_device_brightness *br = device->brightness; 714 int result; 715 unsigned long long level; 716 int test_level; 717 718 /* don't mess with existing known broken systems */ 719 if (bqc_offset_aml_bug_workaround) 720 return 0; 721 722 /* 723 * Some systems always report current brightness level as maximum 724 * through _BQC, we need to test another value for them. However, 725 * there is a subtlety: 726 * 727 * If the _BCL package ordering is descending, the first level 728 * (br->levels[2]) is likely to be 0, and if the number of levels 729 * matches the number of steps, we might confuse a returned level to 730 * mean the index. 731 * 732 * For example: 733 * 734 * current_level = max_level = 100 735 * test_level = 0 736 * returned level = 100 737 * 738 * In this case 100 means the level, not the index, and _BCM failed. 739 * Still, if the _BCL package ordering is descending, the index of 740 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 741 * 742 * This causes all _BQC calls to return bogus values causing weird 743 * behavior from the user's perspective. For example: 744 * 745 * xbacklight -set 10; xbacklight -set 20; 746 * 747 * would flash to 90% and then slowly down to the desired level (20). 748 * 749 * The solution is simple; test anything other than the first level 750 * (e.g. 1). 751 */ 752 test_level = current_level == max_level 753 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 754 : max_level; 755 756 result = acpi_video_device_lcd_set_level(device, test_level); 757 if (result) 758 return result; 759 760 result = acpi_video_device_lcd_get_level_current(device, &level, true); 761 if (result) 762 return result; 763 764 if (level != test_level) { 765 /* buggy _BQC found, need to find out if it uses index */ 766 if (level < br->count) { 767 if (br->flags._BCL_reversed) 768 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 769 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 770 br->flags._BQC_use_index = 1; 771 } 772 773 if (!br->flags._BQC_use_index) 774 device->cap._BQC = device->cap._BCQ = 0; 775 } 776 777 return 0; 778 } 779 780 int acpi_video_get_levels(struct acpi_device *device, 781 struct acpi_video_device_brightness **dev_br, 782 int *pmax_level) 783 { 784 union acpi_object *obj = NULL; 785 int i, max_level = 0, count = 0, level_ac_battery = 0; 786 union acpi_object *o; 787 struct acpi_video_device_brightness *br = NULL; 788 int result = 0; 789 u32 value; 790 791 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 792 acpi_handle_debug(device->handle, 793 "Could not query available LCD brightness level\n"); 794 result = -ENODEV; 795 goto out; 796 } 797 798 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 799 result = -EINVAL; 800 goto out; 801 } 802 803 br = kzalloc(sizeof(*br), GFP_KERNEL); 804 if (!br) { 805 result = -ENOMEM; 806 goto out; 807 } 808 809 /* 810 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 811 * in order to account for buggy BIOS which don't export the first two 812 * special levels (see below) 813 */ 814 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 815 sizeof(*br->levels), 816 GFP_KERNEL); 817 if (!br->levels) { 818 result = -ENOMEM; 819 goto out_free; 820 } 821 822 for (i = 0; i < obj->package.count; i++) { 823 o = (union acpi_object *)&obj->package.elements[i]; 824 if (o->type != ACPI_TYPE_INTEGER) { 825 acpi_handle_info(device->handle, "Invalid data\n"); 826 continue; 827 } 828 value = (u32) o->integer.value; 829 /* Skip duplicate entries */ 830 if (count > ACPI_VIDEO_FIRST_LEVEL 831 && br->levels[count - 1] == value) 832 continue; 833 834 br->levels[count] = value; 835 836 if (br->levels[count] > max_level) 837 max_level = br->levels[count]; 838 count++; 839 } 840 841 /* 842 * some buggy BIOS don't export the levels 843 * when machine is on AC/Battery in _BCL package. 844 * In this case, the first two elements in _BCL packages 845 * are also supported brightness levels that OS should take care of. 846 */ 847 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 848 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 849 level_ac_battery++; 850 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 851 level_ac_battery++; 852 } 853 854 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 855 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 856 br->flags._BCL_no_ac_battery_levels = 1; 857 for (i = (count - 1 + level_ac_battery); 858 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 859 br->levels[i] = br->levels[i - level_ac_battery]; 860 count += level_ac_battery; 861 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 862 acpi_handle_info(device->handle, 863 "Too many duplicates in _BCL package"); 864 865 /* Check if the _BCL package is in a reversed order */ 866 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 867 br->flags._BCL_reversed = 1; 868 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 869 count - ACPI_VIDEO_FIRST_LEVEL, 870 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 871 acpi_video_cmp_level, NULL); 872 } else if (max_level != br->levels[count - 1]) 873 acpi_handle_info(device->handle, 874 "Found unordered _BCL package"); 875 876 br->count = count; 877 *dev_br = br; 878 if (pmax_level) 879 *pmax_level = max_level; 880 881 out: 882 kfree(obj); 883 return result; 884 out_free: 885 kfree(br); 886 goto out; 887 } 888 EXPORT_SYMBOL(acpi_video_get_levels); 889 890 /* 891 * Arg: 892 * device : video output device (LCD, CRT, ..) 893 * 894 * Return Value: 895 * Maximum brightness level 896 * 897 * Allocate and initialize device->brightness. 898 */ 899 900 static int 901 acpi_video_init_brightness(struct acpi_video_device *device) 902 { 903 int i, max_level = 0; 904 unsigned long long level, level_old; 905 struct acpi_video_device_brightness *br = NULL; 906 int result; 907 908 result = acpi_video_get_levels(device->dev, &br, &max_level); 909 if (result) 910 return result; 911 device->brightness = br; 912 913 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 914 br->curr = level = max_level; 915 916 if (!device->cap._BQC) 917 goto set_level; 918 919 result = acpi_video_device_lcd_get_level_current(device, 920 &level_old, true); 921 if (result) 922 goto out_free_levels; 923 924 result = acpi_video_bqc_quirk(device, max_level, level_old); 925 if (result) 926 goto out_free_levels; 927 /* 928 * cap._BQC may get cleared due to _BQC is found to be broken 929 * in acpi_video_bqc_quirk, so check again here. 930 */ 931 if (!device->cap._BQC) 932 goto set_level; 933 934 level = acpi_video_bqc_value_to_level(device, level_old); 935 /* 936 * On some buggy laptops, _BQC returns an uninitialized 937 * value when invoked for the first time, i.e. 938 * level_old is invalid (no matter whether it's a level 939 * or an index). Set the backlight to max_level in this case. 940 */ 941 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 942 if (level == br->levels[i]) 943 break; 944 if (i == br->count || !level) 945 level = max_level; 946 947 set_level: 948 result = acpi_video_device_lcd_set_level(device, level); 949 if (result) 950 goto out_free_levels; 951 952 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 953 br->count - ACPI_VIDEO_FIRST_LEVEL); 954 955 return 0; 956 957 out_free_levels: 958 kfree(br->levels); 959 kfree(br); 960 device->brightness = NULL; 961 return result; 962 } 963 964 /* 965 * Arg: 966 * device : video output device (LCD, CRT, ..) 967 * 968 * Return Value: 969 * None 970 * 971 * Find out all required AML methods defined under the output 972 * device. 973 */ 974 975 static void acpi_video_device_find_cap(struct acpi_video_device *device) 976 { 977 if (acpi_has_method(device->dev->handle, "_ADR")) 978 device->cap._ADR = 1; 979 if (acpi_has_method(device->dev->handle, "_BCL")) 980 device->cap._BCL = 1; 981 if (acpi_has_method(device->dev->handle, "_BCM")) 982 device->cap._BCM = 1; 983 if (acpi_has_method(device->dev->handle, "_BQC")) { 984 device->cap._BQC = 1; 985 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 986 acpi_handle_info(device->dev->handle, 987 "_BCQ is used instead of _BQC\n"); 988 device->cap._BCQ = 1; 989 } 990 991 if (acpi_has_method(device->dev->handle, "_DDC")) 992 device->cap._DDC = 1; 993 } 994 995 /* 996 * Arg: 997 * device : video output device (VGA) 998 * 999 * Return Value: 1000 * None 1001 * 1002 * Find out all required AML methods defined under the video bus device. 1003 */ 1004 1005 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1006 { 1007 if (acpi_has_method(video->device->handle, "_DOS")) 1008 video->cap._DOS = 1; 1009 if (acpi_has_method(video->device->handle, "_DOD")) 1010 video->cap._DOD = 1; 1011 if (acpi_has_method(video->device->handle, "_ROM")) 1012 video->cap._ROM = 1; 1013 if (acpi_has_method(video->device->handle, "_GPD")) 1014 video->cap._GPD = 1; 1015 if (acpi_has_method(video->device->handle, "_SPD")) 1016 video->cap._SPD = 1; 1017 if (acpi_has_method(video->device->handle, "_VPO")) 1018 video->cap._VPO = 1; 1019 } 1020 1021 /* 1022 * Check whether the video bus device has required AML method to 1023 * support the desired features 1024 */ 1025 1026 static int acpi_video_bus_check(struct acpi_video_bus *video) 1027 { 1028 acpi_status status = -ENOENT; 1029 struct pci_dev *dev; 1030 1031 if (!video) 1032 return -EINVAL; 1033 1034 dev = acpi_get_pci_dev(video->device->handle); 1035 if (!dev) 1036 return -ENODEV; 1037 pci_dev_put(dev); 1038 1039 /* 1040 * Since there is no HID, CID and so on for VGA driver, we have 1041 * to check well known required nodes. 1042 */ 1043 1044 /* Does this device support video switching? */ 1045 if (video->cap._DOS || video->cap._DOD) { 1046 if (!video->cap._DOS) { 1047 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1048 acpi_device_bid(video->device)); 1049 } 1050 video->flags.multihead = 1; 1051 status = 0; 1052 } 1053 1054 /* Does this device support retrieving a video ROM? */ 1055 if (video->cap._ROM) { 1056 video->flags.rom = 1; 1057 status = 0; 1058 } 1059 1060 /* Does this device support configuring which video device to POST? */ 1061 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1062 video->flags.post = 1; 1063 status = 0; 1064 } 1065 1066 return status; 1067 } 1068 1069 /* 1070 * -------------------------------------------------------------------------- 1071 * Driver Interface 1072 * -------------------------------------------------------------------------- 1073 */ 1074 1075 /* device interface */ 1076 static struct acpi_video_device_attrib * 1077 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1078 { 1079 struct acpi_video_enumerated_device *ids; 1080 int i; 1081 1082 for (i = 0; i < video->attached_count; i++) { 1083 ids = &video->attached_array[i]; 1084 if ((ids->value.int_val & 0xffff) == device_id) 1085 return &ids->value.attrib; 1086 } 1087 1088 return NULL; 1089 } 1090 1091 static int 1092 acpi_video_get_device_type(struct acpi_video_bus *video, 1093 unsigned long device_id) 1094 { 1095 struct acpi_video_enumerated_device *ids; 1096 int i; 1097 1098 for (i = 0; i < video->attached_count; i++) { 1099 ids = &video->attached_array[i]; 1100 if ((ids->value.int_val & 0xffff) == device_id) 1101 return ids->value.int_val; 1102 } 1103 1104 return 0; 1105 } 1106 1107 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1108 { 1109 struct acpi_video_bus *video = arg; 1110 struct acpi_video_device_attrib *attribute; 1111 struct acpi_video_device *data; 1112 unsigned long long device_id; 1113 acpi_status status; 1114 int device_type; 1115 1116 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1117 /* Skip devices without _ADR instead of failing. */ 1118 if (ACPI_FAILURE(status)) 1119 goto exit; 1120 1121 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1122 if (!data) { 1123 dev_dbg(&device->dev, "Cannot attach\n"); 1124 return -ENOMEM; 1125 } 1126 1127 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1128 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1129 device->driver_data = data; 1130 1131 data->device_id = device_id; 1132 data->video = video; 1133 data->dev = device; 1134 INIT_DELAYED_WORK(&data->switch_brightness_work, 1135 acpi_video_switch_brightness); 1136 1137 attribute = acpi_video_get_device_attr(video, device_id); 1138 1139 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1140 switch (attribute->display_type) { 1141 case ACPI_VIDEO_DISPLAY_CRT: 1142 data->flags.crt = 1; 1143 break; 1144 case ACPI_VIDEO_DISPLAY_TV: 1145 data->flags.tvout = 1; 1146 break; 1147 case ACPI_VIDEO_DISPLAY_DVI: 1148 data->flags.dvi = 1; 1149 break; 1150 case ACPI_VIDEO_DISPLAY_LCD: 1151 data->flags.lcd = 1; 1152 break; 1153 default: 1154 data->flags.unknown = 1; 1155 break; 1156 } 1157 if (attribute->bios_can_detect) 1158 data->flags.bios = 1; 1159 } else { 1160 /* Check for legacy IDs */ 1161 device_type = acpi_video_get_device_type(video, device_id); 1162 /* Ignore bits 16 and 18-20 */ 1163 switch (device_type & 0xffe2ffff) { 1164 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1165 data->flags.crt = 1; 1166 break; 1167 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1168 data->flags.lcd = 1; 1169 break; 1170 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1171 data->flags.tvout = 1; 1172 break; 1173 default: 1174 data->flags.unknown = 1; 1175 } 1176 } 1177 1178 acpi_video_device_bind(video, data); 1179 acpi_video_device_find_cap(data); 1180 1181 if (data->cap._BCM && data->cap._BCL) 1182 may_report_brightness_keys = true; 1183 1184 mutex_lock(&video->device_list_lock); 1185 list_add_tail(&data->entry, &video->video_device_list); 1186 mutex_unlock(&video->device_list_lock); 1187 1188 exit: 1189 video->child_count++; 1190 return 0; 1191 } 1192 1193 /* 1194 * Arg: 1195 * video : video bus device 1196 * 1197 * Return: 1198 * none 1199 * 1200 * Enumerate the video device list of the video bus, 1201 * bind the ids with the corresponding video devices 1202 * under the video bus. 1203 */ 1204 1205 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1206 { 1207 struct acpi_video_device *dev; 1208 1209 mutex_lock(&video->device_list_lock); 1210 1211 list_for_each_entry(dev, &video->video_device_list, entry) 1212 acpi_video_device_bind(video, dev); 1213 1214 mutex_unlock(&video->device_list_lock); 1215 } 1216 1217 /* 1218 * Arg: 1219 * video : video bus device 1220 * device : video output device under the video 1221 * bus 1222 * 1223 * Return: 1224 * none 1225 * 1226 * Bind the ids with the corresponding video devices 1227 * under the video bus. 1228 */ 1229 1230 static void 1231 acpi_video_device_bind(struct acpi_video_bus *video, 1232 struct acpi_video_device *device) 1233 { 1234 struct acpi_video_enumerated_device *ids; 1235 int i; 1236 1237 for (i = 0; i < video->attached_count; i++) { 1238 ids = &video->attached_array[i]; 1239 if (device->device_id == (ids->value.int_val & 0xffff)) { 1240 ids->bind_info = device; 1241 acpi_handle_debug(video->device->handle, "%s: %d\n", 1242 __func__, 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_FAILURE(status)) { 1295 acpi_handle_info(video->device->handle, 1296 "_DOD evaluation failed: %s\n", 1297 acpi_format_exception(status)); 1298 return status; 1299 } 1300 1301 dod = buffer.pointer; 1302 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1303 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1304 status = -EFAULT; 1305 goto out; 1306 } 1307 1308 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1309 dod->package.count); 1310 1311 active_list = kcalloc(1 + dod->package.count, 1312 sizeof(struct acpi_video_enumerated_device), 1313 GFP_KERNEL); 1314 if (!active_list) { 1315 status = -ENOMEM; 1316 goto out; 1317 } 1318 1319 count = 0; 1320 for (i = 0; i < dod->package.count; i++) { 1321 obj = &dod->package.elements[i]; 1322 1323 if (obj->type != ACPI_TYPE_INTEGER) { 1324 acpi_handle_info(video->device->handle, 1325 "Invalid _DOD data in element %d\n", i); 1326 continue; 1327 } 1328 1329 active_list[count].value.int_val = obj->integer.value; 1330 active_list[count].bind_info = NULL; 1331 1332 acpi_handle_debug(video->device->handle, 1333 "_DOD element[%d] = %d\n", i, 1334 (int)obj->integer.value); 1335 1336 count++; 1337 } 1338 1339 kfree(video->attached_array); 1340 1341 video->attached_array = active_list; 1342 video->attached_count = count; 1343 1344 out: 1345 kfree(buffer.pointer); 1346 return status; 1347 } 1348 1349 static int 1350 acpi_video_get_next_level(struct acpi_video_device *device, 1351 u32 level_current, u32 event) 1352 { 1353 int min, max, min_above, max_below, i, l, delta = 255; 1354 max = max_below = 0; 1355 min = min_above = 255; 1356 /* Find closest level to level_current */ 1357 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1358 l = device->brightness->levels[i]; 1359 if (abs(l - level_current) < abs(delta)) { 1360 delta = l - level_current; 1361 if (!delta) 1362 break; 1363 } 1364 } 1365 /* Adjust level_current to closest available level */ 1366 level_current += delta; 1367 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1368 l = device->brightness->levels[i]; 1369 if (l < min) 1370 min = l; 1371 if (l > max) 1372 max = l; 1373 if (l < min_above && l > level_current) 1374 min_above = l; 1375 if (l > max_below && l < level_current) 1376 max_below = l; 1377 } 1378 1379 switch (event) { 1380 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1381 return (level_current < max) ? min_above : min; 1382 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1383 return (level_current < max) ? min_above : max; 1384 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1385 return (level_current > min) ? max_below : min; 1386 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1387 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1388 return 0; 1389 default: 1390 return level_current; 1391 } 1392 } 1393 1394 static void 1395 acpi_video_switch_brightness(struct work_struct *work) 1396 { 1397 struct acpi_video_device *device = container_of(to_delayed_work(work), 1398 struct acpi_video_device, switch_brightness_work); 1399 unsigned long long level_current, level_next; 1400 int event = device->switch_brightness_event; 1401 int result = -EINVAL; 1402 1403 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1404 if (!device->backlight) 1405 return; 1406 1407 if (!device->brightness) 1408 goto out; 1409 1410 result = acpi_video_device_lcd_get_level_current(device, 1411 &level_current, 1412 false); 1413 if (result) 1414 goto out; 1415 1416 level_next = acpi_video_get_next_level(device, level_current, event); 1417 1418 result = acpi_video_device_lcd_set_level(device, level_next); 1419 1420 if (!result) 1421 backlight_force_update(device->backlight, 1422 BACKLIGHT_UPDATE_HOTKEY); 1423 1424 out: 1425 if (result) 1426 acpi_handle_info(device->dev->handle, 1427 "Failed to switch brightness\n"); 1428 } 1429 1430 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1431 void **edid) 1432 { 1433 struct acpi_video_bus *video; 1434 struct acpi_video_device *video_device; 1435 union acpi_object *buffer = NULL; 1436 acpi_status status; 1437 int i, length; 1438 1439 if (!device || !acpi_driver_data(device)) 1440 return -EINVAL; 1441 1442 video = acpi_driver_data(device); 1443 1444 for (i = 0; i < video->attached_count; i++) { 1445 video_device = video->attached_array[i].bind_info; 1446 length = 256; 1447 1448 if (!video_device) 1449 continue; 1450 1451 if (!video_device->cap._DDC) 1452 continue; 1453 1454 if (type) { 1455 switch (type) { 1456 case ACPI_VIDEO_DISPLAY_CRT: 1457 if (!video_device->flags.crt) 1458 continue; 1459 break; 1460 case ACPI_VIDEO_DISPLAY_TV: 1461 if (!video_device->flags.tvout) 1462 continue; 1463 break; 1464 case ACPI_VIDEO_DISPLAY_DVI: 1465 if (!video_device->flags.dvi) 1466 continue; 1467 break; 1468 case ACPI_VIDEO_DISPLAY_LCD: 1469 if (!video_device->flags.lcd) 1470 continue; 1471 break; 1472 } 1473 } else if (video_device->device_id != device_id) { 1474 continue; 1475 } 1476 1477 status = acpi_video_device_EDID(video_device, &buffer, length); 1478 1479 if (ACPI_FAILURE(status) || !buffer || 1480 buffer->type != ACPI_TYPE_BUFFER) { 1481 length = 128; 1482 status = acpi_video_device_EDID(video_device, &buffer, 1483 length); 1484 if (ACPI_FAILURE(status) || !buffer || 1485 buffer->type != ACPI_TYPE_BUFFER) { 1486 continue; 1487 } 1488 } 1489 1490 *edid = buffer->buffer.pointer; 1491 return length; 1492 } 1493 1494 return -ENODEV; 1495 } 1496 EXPORT_SYMBOL(acpi_video_get_edid); 1497 1498 static int 1499 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1500 struct acpi_device *device) 1501 { 1502 /* 1503 * There are systems where video module known to work fine regardless 1504 * of broken _DOD and ignoring returned value here doesn't cause 1505 * any issues later. 1506 */ 1507 acpi_video_device_enumerate(video); 1508 1509 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1510 } 1511 1512 /* acpi_video interface */ 1513 1514 /* 1515 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1516 * perform any automatic brightness change on receiving a notification. 1517 */ 1518 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1519 { 1520 return acpi_video_bus_DOS(video, 0, 1521 acpi_osi_is_win8() ? 1 : 0); 1522 } 1523 1524 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1525 { 1526 return acpi_video_bus_DOS(video, 0, 1527 acpi_osi_is_win8() ? 0 : 1); 1528 } 1529 1530 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1531 { 1532 struct acpi_video_bus *video = acpi_driver_data(device); 1533 struct input_dev *input; 1534 int keycode = 0; 1535 1536 if (!video || !video->input) 1537 return; 1538 1539 input = video->input; 1540 1541 switch (event) { 1542 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1543 * most likely via hotkey. */ 1544 keycode = KEY_SWITCHVIDEOMODE; 1545 break; 1546 1547 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1548 * connector. */ 1549 acpi_video_device_enumerate(video); 1550 acpi_video_device_rebind(video); 1551 keycode = KEY_SWITCHVIDEOMODE; 1552 break; 1553 1554 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1555 keycode = KEY_SWITCHVIDEOMODE; 1556 break; 1557 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1558 keycode = KEY_VIDEO_NEXT; 1559 break; 1560 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1561 keycode = KEY_VIDEO_PREV; 1562 break; 1563 1564 default: 1565 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1566 event); 1567 break; 1568 } 1569 1570 if (acpi_notifier_call_chain(device, event, 0)) 1571 /* Something vetoed the keypress. */ 1572 keycode = 0; 1573 1574 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1575 input_report_key(input, keycode, 1); 1576 input_sync(input); 1577 input_report_key(input, keycode, 0); 1578 input_sync(input); 1579 } 1580 } 1581 1582 static void brightness_switch_event(struct acpi_video_device *video_device, 1583 u32 event) 1584 { 1585 if (!brightness_switch_enabled) 1586 return; 1587 1588 video_device->switch_brightness_event = event; 1589 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1590 } 1591 1592 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1593 { 1594 struct acpi_video_device *video_device = data; 1595 struct acpi_device *device = NULL; 1596 struct acpi_video_bus *bus; 1597 struct input_dev *input; 1598 int keycode = 0; 1599 1600 if (!video_device) 1601 return; 1602 1603 device = video_device->dev; 1604 bus = video_device->video; 1605 input = bus->input; 1606 1607 if (hw_changes_brightness > 0) { 1608 if (video_device->backlight) 1609 backlight_force_update(video_device->backlight, 1610 BACKLIGHT_UPDATE_HOTKEY); 1611 acpi_notifier_call_chain(device, event, 0); 1612 return; 1613 } 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_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1638 break; 1639 } 1640 1641 if (keycode) 1642 may_report_brightness_keys = true; 1643 1644 acpi_notifier_call_chain(device, event, 0); 1645 1646 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1647 input_report_key(input, keycode, 1); 1648 input_sync(input); 1649 input_report_key(input, keycode, 0); 1650 input_sync(input); 1651 } 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_POST_HIBERNATION: 1663 case PM_POST_SUSPEND: 1664 case PM_POST_RESTORE: 1665 video = container_of(nb, struct acpi_video_bus, pm_nb); 1666 1667 dev_info(&video->device->dev, "Restoring backlight state\n"); 1668 1669 for (i = 0; i < video->attached_count; i++) { 1670 video_device = video->attached_array[i].bind_info; 1671 if (video_device && video_device->brightness) 1672 acpi_video_device_lcd_set_level(video_device, 1673 video_device->brightness->curr); 1674 } 1675 1676 return NOTIFY_OK; 1677 } 1678 return NOTIFY_DONE; 1679 } 1680 1681 static acpi_status 1682 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1683 void **return_value) 1684 { 1685 struct acpi_device *device = context; 1686 struct acpi_device *sibling; 1687 1688 if (handle == device->handle) 1689 return AE_CTRL_TERMINATE; 1690 1691 sibling = acpi_fetch_acpi_dev(handle); 1692 if (!sibling) 1693 return AE_OK; 1694 1695 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1696 return AE_ALREADY_EXISTS; 1697 1698 return AE_OK; 1699 } 1700 1701 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1702 { 1703 struct backlight_properties props; 1704 struct pci_dev *pdev; 1705 acpi_handle acpi_parent; 1706 struct device *parent = NULL; 1707 int result; 1708 static int count; 1709 char *name; 1710 1711 result = acpi_video_init_brightness(device); 1712 if (result) 1713 return; 1714 1715 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1716 if (!name) 1717 return; 1718 count++; 1719 1720 acpi_get_parent(device->dev->handle, &acpi_parent); 1721 1722 pdev = acpi_get_pci_dev(acpi_parent); 1723 if (pdev) { 1724 parent = &pdev->dev; 1725 pci_dev_put(pdev); 1726 } 1727 1728 memset(&props, 0, sizeof(struct backlight_properties)); 1729 props.type = BACKLIGHT_FIRMWARE; 1730 props.max_brightness = 1731 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1732 device->backlight = backlight_device_register(name, 1733 parent, 1734 device, 1735 &acpi_backlight_ops, 1736 &props); 1737 kfree(name); 1738 if (IS_ERR(device->backlight)) { 1739 device->backlight = NULL; 1740 return; 1741 } 1742 1743 /* 1744 * Save current brightness level in case we have to restore it 1745 * before acpi_video_device_lcd_set_level() is called next time. 1746 */ 1747 device->backlight->props.brightness = 1748 acpi_video_get_brightness(device->backlight); 1749 1750 device->cooling_dev = thermal_cooling_device_register("LCD", 1751 device->dev, &video_cooling_ops); 1752 if (IS_ERR(device->cooling_dev)) { 1753 /* 1754 * Set cooling_dev to NULL so we don't crash trying to free it. 1755 * Also, why the hell we are returning early and not attempt to 1756 * register video output if cooling device registration failed? 1757 * -- dtor 1758 */ 1759 device->cooling_dev = NULL; 1760 return; 1761 } 1762 1763 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1764 device->cooling_dev->id); 1765 result = sysfs_create_link(&device->dev->dev.kobj, 1766 &device->cooling_dev->device.kobj, 1767 "thermal_cooling"); 1768 if (result) 1769 pr_info("sysfs link creation failed\n"); 1770 1771 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1772 &device->dev->dev.kobj, "device"); 1773 if (result) 1774 pr_info("Reverse sysfs link creation failed\n"); 1775 } 1776 1777 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1778 { 1779 struct acpi_video_device *dev; 1780 union acpi_object *levels; 1781 1782 mutex_lock(&video->device_list_lock); 1783 list_for_each_entry(dev, &video->video_device_list, entry) { 1784 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1785 kfree(levels); 1786 } 1787 mutex_unlock(&video->device_list_lock); 1788 } 1789 1790 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1791 { 1792 /* 1793 * Do not create backlight device for video output 1794 * device that is not in the enumerated list. 1795 */ 1796 if (!acpi_video_device_in_dod(dev)) { 1797 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1798 return false; 1799 } 1800 1801 if (only_lcd) 1802 return dev->flags.lcd; 1803 return true; 1804 } 1805 1806 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1807 { 1808 struct acpi_video_device *dev; 1809 1810 if (video->backlight_registered) 1811 return 0; 1812 1813 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1814 return 0; 1815 1816 mutex_lock(&video->device_list_lock); 1817 list_for_each_entry(dev, &video->video_device_list, entry) { 1818 if (acpi_video_should_register_backlight(dev)) 1819 acpi_video_dev_register_backlight(dev); 1820 } 1821 mutex_unlock(&video->device_list_lock); 1822 1823 video->backlight_registered = true; 1824 1825 video->pm_nb.notifier_call = acpi_video_resume; 1826 video->pm_nb.priority = 0; 1827 return register_pm_notifier(&video->pm_nb); 1828 } 1829 1830 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1831 { 1832 if (device->backlight) { 1833 backlight_device_unregister(device->backlight); 1834 device->backlight = NULL; 1835 } 1836 if (device->brightness) { 1837 kfree(device->brightness->levels); 1838 kfree(device->brightness); 1839 device->brightness = NULL; 1840 } 1841 if (device->cooling_dev) { 1842 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1843 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1844 thermal_cooling_device_unregister(device->cooling_dev); 1845 device->cooling_dev = NULL; 1846 } 1847 } 1848 1849 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1850 { 1851 struct acpi_video_device *dev; 1852 int error; 1853 1854 if (!video->backlight_registered) 1855 return 0; 1856 1857 error = unregister_pm_notifier(&video->pm_nb); 1858 1859 mutex_lock(&video->device_list_lock); 1860 list_for_each_entry(dev, &video->video_device_list, entry) 1861 acpi_video_dev_unregister_backlight(dev); 1862 mutex_unlock(&video->device_list_lock); 1863 1864 video->backlight_registered = false; 1865 1866 return error; 1867 } 1868 1869 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1870 { 1871 acpi_status status; 1872 struct acpi_device *adev = device->dev; 1873 1874 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1875 acpi_video_device_notify, device); 1876 if (ACPI_FAILURE(status)) 1877 dev_err(&adev->dev, "Error installing notify handler\n"); 1878 else 1879 device->flags.notify = 1; 1880 } 1881 1882 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1883 { 1884 struct input_dev *input; 1885 struct acpi_video_device *dev; 1886 int error; 1887 1888 video->input = input = input_allocate_device(); 1889 if (!input) { 1890 error = -ENOMEM; 1891 goto out; 1892 } 1893 1894 error = acpi_video_bus_start_devices(video); 1895 if (error) 1896 goto err_free_input; 1897 1898 snprintf(video->phys, sizeof(video->phys), 1899 "%s/video/input0", acpi_device_hid(video->device)); 1900 1901 input->name = acpi_device_name(video->device); 1902 input->phys = video->phys; 1903 input->id.bustype = BUS_HOST; 1904 input->id.product = 0x06; 1905 input->dev.parent = &video->device->dev; 1906 input->evbit[0] = BIT(EV_KEY); 1907 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1908 set_bit(KEY_VIDEO_NEXT, input->keybit); 1909 set_bit(KEY_VIDEO_PREV, input->keybit); 1910 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1911 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1912 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1913 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1914 set_bit(KEY_DISPLAY_OFF, input->keybit); 1915 1916 error = input_register_device(input); 1917 if (error) 1918 goto err_stop_dev; 1919 1920 mutex_lock(&video->device_list_lock); 1921 list_for_each_entry(dev, &video->video_device_list, entry) 1922 acpi_video_dev_add_notify_handler(dev); 1923 mutex_unlock(&video->device_list_lock); 1924 1925 return 0; 1926 1927 err_stop_dev: 1928 acpi_video_bus_stop_devices(video); 1929 err_free_input: 1930 input_free_device(input); 1931 video->input = NULL; 1932 out: 1933 return error; 1934 } 1935 1936 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1937 { 1938 if (dev->flags.notify) { 1939 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1940 acpi_video_device_notify); 1941 dev->flags.notify = 0; 1942 } 1943 } 1944 1945 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1946 { 1947 struct acpi_video_device *dev; 1948 1949 mutex_lock(&video->device_list_lock); 1950 list_for_each_entry(dev, &video->video_device_list, entry) 1951 acpi_video_dev_remove_notify_handler(dev); 1952 mutex_unlock(&video->device_list_lock); 1953 1954 acpi_video_bus_stop_devices(video); 1955 input_unregister_device(video->input); 1956 video->input = NULL; 1957 } 1958 1959 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1960 { 1961 struct acpi_video_device *dev, *next; 1962 1963 mutex_lock(&video->device_list_lock); 1964 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1965 list_del(&dev->entry); 1966 kfree(dev); 1967 } 1968 mutex_unlock(&video->device_list_lock); 1969 1970 return 0; 1971 } 1972 1973 static int instance; 1974 1975 static int acpi_video_bus_add(struct acpi_device *device) 1976 { 1977 struct acpi_video_bus *video; 1978 bool auto_detect; 1979 int error; 1980 acpi_status status; 1981 1982 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1983 acpi_dev_parent(device)->handle, 1, 1984 acpi_video_bus_match, NULL, 1985 device, NULL); 1986 if (status == AE_ALREADY_EXISTS) { 1987 pr_info(FW_BUG 1988 "Duplicate ACPI video bus devices for the" 1989 " same VGA controller, please try module " 1990 "parameter \"video.allow_duplicates=1\"" 1991 "if the current driver doesn't work.\n"); 1992 if (!allow_duplicates) 1993 return -ENODEV; 1994 } 1995 1996 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 1997 if (!video) 1998 return -ENOMEM; 1999 2000 /* a hack to fix the duplicate name "VID" problem on T61 */ 2001 if (!strcmp(device->pnp.bus_id, "VID")) { 2002 if (instance) 2003 device->pnp.bus_id[3] = '0' + instance; 2004 instance++; 2005 } 2006 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2007 if (!strcmp(device->pnp.bus_id, "VGA")) { 2008 if (instance) 2009 device->pnp.bus_id[3] = '0' + instance; 2010 instance++; 2011 } 2012 2013 video->device = device; 2014 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2015 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2016 device->driver_data = video; 2017 2018 acpi_video_bus_find_cap(video); 2019 error = acpi_video_bus_check(video); 2020 if (error) 2021 goto err_free_video; 2022 2023 mutex_init(&video->device_list_lock); 2024 INIT_LIST_HEAD(&video->video_device_list); 2025 2026 error = acpi_video_bus_get_devices(video, device); 2027 if (error) 2028 goto err_put_video; 2029 2030 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2031 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2032 video->flags.multihead ? "yes" : "no", 2033 video->flags.rom ? "yes" : "no", 2034 video->flags.post ? "yes" : "no"); 2035 mutex_lock(&video_list_lock); 2036 list_add_tail(&video->entry, &video_bus_head); 2037 mutex_unlock(&video_list_lock); 2038 2039 /* 2040 * If backlight-type auto-detection is used then a native backlight may 2041 * show up later and this may change the result from video to native. 2042 * Therefor normally the userspace visible /sys/class/backlight device 2043 * gets registered separately by the GPU driver calling 2044 * acpi_video_register_backlight() when an internal panel is detected. 2045 * Register the backlight now when not using auto-detection, so that 2046 * when the kernel cmdline or DMI-quirks are used the backlight will 2047 * get registered even if acpi_video_register_backlight() is not called. 2048 */ 2049 acpi_video_run_bcl_for_osi(video); 2050 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && 2051 !auto_detect) 2052 acpi_video_bus_register_backlight(video); 2053 2054 acpi_video_bus_add_notify_handler(video); 2055 2056 return 0; 2057 2058 err_put_video: 2059 acpi_video_bus_put_devices(video); 2060 kfree(video->attached_array); 2061 err_free_video: 2062 kfree(video); 2063 device->driver_data = NULL; 2064 2065 return error; 2066 } 2067 2068 static void acpi_video_bus_remove(struct acpi_device *device) 2069 { 2070 struct acpi_video_bus *video = NULL; 2071 2072 2073 if (!device || !acpi_driver_data(device)) 2074 return; 2075 2076 video = acpi_driver_data(device); 2077 2078 mutex_lock(&video_list_lock); 2079 list_del(&video->entry); 2080 mutex_unlock(&video_list_lock); 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 kfree(video->attached_array); 2087 kfree(video); 2088 } 2089 2090 static int __init is_i740(struct pci_dev *dev) 2091 { 2092 if (dev->device == 0x00D1) 2093 return 1; 2094 if (dev->device == 0x7000) 2095 return 1; 2096 return 0; 2097 } 2098 2099 static int __init intel_opregion_present(void) 2100 { 2101 int opregion = 0; 2102 struct pci_dev *dev = NULL; 2103 u32 address; 2104 2105 for_each_pci_dev(dev) { 2106 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2107 continue; 2108 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2109 continue; 2110 /* We don't want to poke around undefined i740 registers */ 2111 if (is_i740(dev)) 2112 continue; 2113 pci_read_config_dword(dev, 0xfc, &address); 2114 if (!address) 2115 continue; 2116 opregion = 1; 2117 } 2118 return opregion; 2119 } 2120 2121 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2122 static bool dmi_is_desktop(void) 2123 { 2124 const char *chassis_type; 2125 unsigned long type; 2126 2127 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2128 if (!chassis_type) 2129 return false; 2130 2131 if (kstrtoul(chassis_type, 10, &type) != 0) 2132 return false; 2133 2134 switch (type) { 2135 case 0x03: /* Desktop */ 2136 case 0x04: /* Low Profile Desktop */ 2137 case 0x05: /* Pizza Box */ 2138 case 0x06: /* Mini Tower */ 2139 case 0x07: /* Tower */ 2140 case 0x10: /* Lunch Box */ 2141 case 0x11: /* Main Server Chassis */ 2142 return true; 2143 } 2144 2145 return false; 2146 } 2147 2148 /* 2149 * We're seeing a lot of bogus backlight interfaces on newer machines 2150 * without a LCD such as desktops, servers and HDMI sticks. Checking the 2151 * lcd flag fixes this, enable this by default on any machines which are: 2152 * 1. Win8 ready (where we also prefer the native backlight driver, so 2153 * normally the acpi_video code should not register there anyways); *and* 2154 * 2.1 Report a desktop/server DMI chassis-type, or 2155 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for 2156 backlight control) 2157 */ 2158 static bool should_check_lcd_flag(void) 2159 { 2160 if (!acpi_osi_is_win8()) 2161 return false; 2162 2163 if (dmi_is_desktop()) 2164 return true; 2165 2166 if (acpi_reduced_hardware()) 2167 return true; 2168 2169 return false; 2170 } 2171 2172 int acpi_video_register(void) 2173 { 2174 int ret = 0; 2175 2176 mutex_lock(®ister_count_mutex); 2177 if (register_count) { 2178 /* 2179 * if the function of acpi_video_register is already called, 2180 * don't register the acpi_video_bus again and return no error. 2181 */ 2182 goto leave; 2183 } 2184 2185 if (only_lcd == -1) 2186 only_lcd = should_check_lcd_flag(); 2187 2188 dmi_check_system(video_dmi_table); 2189 2190 ret = acpi_bus_register_driver(&acpi_video_bus); 2191 if (ret) 2192 goto leave; 2193 2194 /* 2195 * When the acpi_video_bus is loaded successfully, increase 2196 * the counter reference. 2197 */ 2198 register_count = 1; 2199 2200 leave: 2201 mutex_unlock(®ister_count_mutex); 2202 return ret; 2203 } 2204 EXPORT_SYMBOL(acpi_video_register); 2205 2206 void acpi_video_unregister(void) 2207 { 2208 mutex_lock(®ister_count_mutex); 2209 if (register_count) { 2210 acpi_bus_unregister_driver(&acpi_video_bus); 2211 register_count = 0; 2212 may_report_brightness_keys = false; 2213 } 2214 mutex_unlock(®ister_count_mutex); 2215 } 2216 EXPORT_SYMBOL(acpi_video_unregister); 2217 2218 void acpi_video_register_backlight(void) 2219 { 2220 struct acpi_video_bus *video; 2221 2222 mutex_lock(&video_list_lock); 2223 list_for_each_entry(video, &video_bus_head, entry) 2224 acpi_video_bus_register_backlight(video); 2225 mutex_unlock(&video_list_lock); 2226 } 2227 EXPORT_SYMBOL(acpi_video_register_backlight); 2228 2229 bool acpi_video_handles_brightness_key_presses(void) 2230 { 2231 return may_report_brightness_keys && 2232 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2233 } 2234 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2235 2236 /* 2237 * This is kind of nasty. Hardware using Intel chipsets may require 2238 * the video opregion code to be run first in order to initialise 2239 * state before any ACPI video calls are made. To handle this we defer 2240 * registration of the video class until the opregion code has run. 2241 */ 2242 2243 static int __init acpi_video_init(void) 2244 { 2245 /* 2246 * Let the module load even if ACPI is disabled (e.g. due to 2247 * a broken BIOS) so that i915.ko can still be loaded on such 2248 * old systems without an AcpiOpRegion. 2249 * 2250 * acpi_video_register() will report -ENODEV later as well due 2251 * to acpi_disabled when i915.ko tries to register itself afterwards. 2252 */ 2253 if (acpi_disabled) 2254 return 0; 2255 2256 if (intel_opregion_present()) 2257 return 0; 2258 2259 return acpi_video_register(); 2260 } 2261 2262 static void __exit acpi_video_exit(void) 2263 { 2264 acpi_video_unregister(); 2265 } 2266 2267 module_init(acpi_video_init); 2268 module_exit(acpi_video_exit); 2269