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(acpi_handle handle, u32 event, void *data); 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 }, 108 }; 109 110 struct acpi_video_bus_flags { 111 u8 multihead:1; /* can switch video heads */ 112 u8 rom:1; /* can retrieve a video rom */ 113 u8 post:1; /* can configure the head to */ 114 u8 reserved:5; 115 }; 116 117 struct acpi_video_bus_cap { 118 u8 _DOS:1; /* Enable/Disable output switching */ 119 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 120 u8 _ROM:1; /* Get ROM Data */ 121 u8 _GPD:1; /* Get POST Device */ 122 u8 _SPD:1; /* Set POST Device */ 123 u8 _VPO:1; /* Video POST Options */ 124 u8 reserved:2; 125 }; 126 127 struct acpi_video_device_attrib { 128 u32 display_index:4; /* A zero-based instance of the Display */ 129 u32 display_port_attachment:4; /* This field differentiates the display type */ 130 u32 display_type:4; /* Describe the specific type in use */ 131 u32 vendor_specific:4; /* Chipset Vendor Specific */ 132 u32 bios_can_detect:1; /* BIOS can detect the device */ 133 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 134 the VGA device. */ 135 u32 pipe_id:3; /* For VGA multiple-head devices. */ 136 u32 reserved:10; /* Must be 0 */ 137 138 /* 139 * The device ID might not actually follow the scheme described by this 140 * struct acpi_video_device_attrib. If it does, then this bit 141 * device_id_scheme is set; otherwise, other fields should be ignored. 142 * 143 * (but also see the global flag device_id_scheme) 144 */ 145 u32 device_id_scheme:1; 146 }; 147 148 struct acpi_video_enumerated_device { 149 union { 150 u32 int_val; 151 struct acpi_video_device_attrib attrib; 152 } value; 153 struct acpi_video_device *bind_info; 154 }; 155 156 struct acpi_video_bus { 157 struct acpi_device *device; 158 bool backlight_registered; 159 u8 dos_setting; 160 struct acpi_video_enumerated_device *attached_array; 161 u8 attached_count; 162 u8 child_count; 163 struct acpi_video_bus_cap cap; 164 struct acpi_video_bus_flags flags; 165 struct list_head video_device_list; 166 struct mutex device_list_lock; /* protects video_device_list */ 167 struct list_head entry; 168 struct input_dev *input; 169 char phys[32]; /* for input device */ 170 struct notifier_block pm_nb; 171 }; 172 173 struct acpi_video_device_flags { 174 u8 crt:1; 175 u8 lcd:1; 176 u8 tvout:1; 177 u8 dvi:1; 178 u8 bios:1; 179 u8 unknown:1; 180 u8 notify:1; 181 u8 reserved:1; 182 }; 183 184 struct acpi_video_device_cap { 185 u8 _ADR:1; /* Return the unique ID */ 186 u8 _BCL:1; /* Query list of brightness control levels supported */ 187 u8 _BCM:1; /* Set the brightness level */ 188 u8 _BQC:1; /* Get current brightness level */ 189 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 190 u8 _DDC:1; /* Return the EDID for this device */ 191 }; 192 193 struct acpi_video_device { 194 unsigned long device_id; 195 struct acpi_video_device_flags flags; 196 struct acpi_video_device_cap cap; 197 struct list_head entry; 198 struct delayed_work switch_brightness_work; 199 int switch_brightness_event; 200 struct acpi_video_bus *video; 201 struct acpi_device *dev; 202 struct acpi_video_device_brightness *brightness; 203 struct backlight_device *backlight; 204 struct thermal_cooling_device *cooling_dev; 205 }; 206 207 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 208 static void acpi_video_device_rebind(struct acpi_video_bus *video); 209 static void acpi_video_device_bind(struct acpi_video_bus *video, 210 struct acpi_video_device *device); 211 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 212 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 213 int level); 214 static int acpi_video_device_lcd_get_level_current( 215 struct acpi_video_device *device, 216 unsigned long long *level, bool raw); 217 static int acpi_video_get_next_level(struct acpi_video_device *device, 218 u32 level_current, u32 event); 219 static void acpi_video_switch_brightness(struct work_struct *work); 220 221 /* backlight device sysfs support */ 222 static int acpi_video_get_brightness(struct backlight_device *bd) 223 { 224 unsigned long long cur_level; 225 int i; 226 struct acpi_video_device *vd = bl_get_data(bd); 227 228 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 229 return -EINVAL; 230 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 231 if (vd->brightness->levels[i] == cur_level) 232 return i - ACPI_VIDEO_FIRST_LEVEL; 233 } 234 return 0; 235 } 236 237 static int acpi_video_set_brightness(struct backlight_device *bd) 238 { 239 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 240 struct acpi_video_device *vd = bl_get_data(bd); 241 242 cancel_delayed_work(&vd->switch_brightness_work); 243 return acpi_video_device_lcd_set_level(vd, 244 vd->brightness->levels[request_level]); 245 } 246 247 static const struct backlight_ops acpi_backlight_ops = { 248 .get_brightness = acpi_video_get_brightness, 249 .update_status = acpi_video_set_brightness, 250 }; 251 252 /* thermal cooling device callbacks */ 253 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 254 unsigned long *state) 255 { 256 struct acpi_device *device = cooling_dev->devdata; 257 struct acpi_video_device *video = acpi_driver_data(device); 258 259 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 260 return 0; 261 } 262 263 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 264 unsigned long *state) 265 { 266 struct acpi_device *device = cooling_dev->devdata; 267 struct acpi_video_device *video = acpi_driver_data(device); 268 unsigned long long level; 269 int offset; 270 271 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 272 return -EINVAL; 273 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 274 offset++) 275 if (level == video->brightness->levels[offset]) { 276 *state = video->brightness->count - offset - 1; 277 return 0; 278 } 279 280 return -EINVAL; 281 } 282 283 static int 284 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 285 { 286 struct acpi_device *device = cooling_dev->devdata; 287 struct acpi_video_device *video = acpi_driver_data(device); 288 int level; 289 290 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 291 return -EINVAL; 292 293 state = video->brightness->count - state; 294 level = video->brightness->levels[state - 1]; 295 return acpi_video_device_lcd_set_level(video, level); 296 } 297 298 static const struct thermal_cooling_device_ops video_cooling_ops = { 299 .get_max_state = video_get_max_state, 300 .get_cur_state = video_get_cur_state, 301 .set_cur_state = video_set_cur_state, 302 }; 303 304 /* 305 * -------------------------------------------------------------------------- 306 * Video Management 307 * -------------------------------------------------------------------------- 308 */ 309 310 static int 311 acpi_video_device_lcd_query_levels(acpi_handle handle, 312 union acpi_object **levels) 313 { 314 int status; 315 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 316 union acpi_object *obj; 317 318 319 *levels = NULL; 320 321 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 322 if (ACPI_FAILURE(status)) 323 return status; 324 obj = (union acpi_object *)buffer.pointer; 325 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 326 acpi_handle_info(handle, "Invalid _BCL data\n"); 327 status = -EFAULT; 328 goto err; 329 } 330 331 *levels = obj; 332 333 return 0; 334 335 err: 336 kfree(buffer.pointer); 337 338 return status; 339 } 340 341 static int 342 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 343 { 344 int status; 345 int state; 346 347 status = acpi_execute_simple_method(device->dev->handle, 348 "_BCM", level); 349 if (ACPI_FAILURE(status)) { 350 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n"); 351 return -EIO; 352 } 353 354 device->brightness->curr = level; 355 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 356 state++) 357 if (level == device->brightness->levels[state]) { 358 if (device->backlight) 359 device->backlight->props.brightness = 360 state - ACPI_VIDEO_FIRST_LEVEL; 361 return 0; 362 } 363 364 acpi_handle_info(device->dev->handle, "Current brightness invalid\n"); 365 return -EINVAL; 366 } 367 368 /* 369 * For some buggy _BQC methods, we need to add a constant value to 370 * the _BQC return value to get the actual current brightness level 371 */ 372 373 static int bqc_offset_aml_bug_workaround; 374 static int video_set_bqc_offset(const struct dmi_system_id *d) 375 { 376 bqc_offset_aml_bug_workaround = 9; 377 return 0; 378 } 379 380 static int video_set_device_id_scheme(const struct dmi_system_id *d) 381 { 382 device_id_scheme = true; 383 return 0; 384 } 385 386 static int video_enable_only_lcd(const struct dmi_system_id *d) 387 { 388 only_lcd = true; 389 return 0; 390 } 391 392 static int video_set_report_key_events(const struct dmi_system_id *id) 393 { 394 if (report_key_events == -1) 395 report_key_events = (uintptr_t)id->driver_data; 396 return 0; 397 } 398 399 static int video_hw_changes_brightness( 400 const struct dmi_system_id *d) 401 { 402 if (hw_changes_brightness == -1) 403 hw_changes_brightness = 1; 404 return 0; 405 } 406 407 static const struct dmi_system_id video_dmi_table[] = { 408 /* 409 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 410 */ 411 { 412 .callback = video_set_bqc_offset, 413 .ident = "Acer Aspire 5720", 414 .matches = { 415 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 416 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 417 }, 418 }, 419 { 420 .callback = video_set_bqc_offset, 421 .ident = "Acer Aspire 5710Z", 422 .matches = { 423 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 424 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 425 }, 426 }, 427 { 428 .callback = video_set_bqc_offset, 429 .ident = "eMachines E510", 430 .matches = { 431 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 432 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 433 }, 434 }, 435 { 436 .callback = video_set_bqc_offset, 437 .ident = "Acer Aspire 5315", 438 .matches = { 439 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 440 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 441 }, 442 }, 443 { 444 .callback = video_set_bqc_offset, 445 .ident = "Acer Aspire 7720", 446 .matches = { 447 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 448 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 449 }, 450 }, 451 452 /* 453 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 454 * but the IDs actually follow the Device ID Scheme. 455 */ 456 { 457 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 458 .callback = video_set_device_id_scheme, 459 .ident = "ESPRIMO Mobile M9410", 460 .matches = { 461 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 462 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 463 }, 464 }, 465 /* 466 * Some machines have multiple video output devices, but only the one 467 * that is the type of LCD can do the backlight control so we should not 468 * register backlight interface for other video output devices. 469 */ 470 { 471 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 472 .callback = video_enable_only_lcd, 473 .ident = "ESPRIMO Mobile M9410", 474 .matches = { 475 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 476 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 477 }, 478 }, 479 /* 480 * Some machines report wrong key events on the acpi-bus, suppress 481 * key event reporting on these. Note this is only intended to work 482 * around events which are plain wrong. In some cases we get double 483 * events, in this case acpi-video is considered the canonical source 484 * and the events from the other source should be filtered. E.g. 485 * by calling acpi_video_handles_brightness_key_presses() from the 486 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 487 */ 488 { 489 .callback = video_set_report_key_events, 490 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 491 .ident = "Dell Vostro V131", 492 .matches = { 493 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 494 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 495 }, 496 }, 497 { 498 .callback = video_set_report_key_events, 499 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 500 .ident = "Dell Vostro 3350", 501 .matches = { 502 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 503 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), 504 }, 505 }, 506 /* 507 * Some machines change the brightness themselves when a brightness 508 * hotkey gets pressed, despite us telling them not to. In this case 509 * acpi_video_device_notify() should only call backlight_force_update( 510 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 511 */ 512 { 513 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 514 .callback = video_hw_changes_brightness, 515 .ident = "Packard Bell EasyNote MZ35", 516 .matches = { 517 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 518 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 519 }, 520 }, 521 {} 522 }; 523 524 static unsigned long long 525 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 526 unsigned long long bqc_value) 527 { 528 unsigned long long level; 529 530 if (device->brightness->flags._BQC_use_index) { 531 /* 532 * _BQC returns an index that doesn't account for the first 2 533 * items with special meaning (see enum acpi_video_level_idx), 534 * so we need to compensate for that by offsetting ourselves 535 */ 536 if (device->brightness->flags._BCL_reversed) 537 bqc_value = device->brightness->count - 538 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 539 540 level = device->brightness->levels[bqc_value + 541 ACPI_VIDEO_FIRST_LEVEL]; 542 } else { 543 level = bqc_value; 544 } 545 546 level += bqc_offset_aml_bug_workaround; 547 548 return level; 549 } 550 551 static int 552 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 553 unsigned long long *level, bool raw) 554 { 555 acpi_status status = AE_OK; 556 int i; 557 558 if (device->cap._BQC || device->cap._BCQ) { 559 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 560 561 status = acpi_evaluate_integer(device->dev->handle, buf, 562 NULL, level); 563 if (ACPI_SUCCESS(status)) { 564 if (raw) { 565 /* 566 * Caller has indicated he wants the raw 567 * value returned by _BQC, so don't furtherly 568 * mess with the value. 569 */ 570 return 0; 571 } 572 573 *level = acpi_video_bqc_value_to_level(device, *level); 574 575 for (i = ACPI_VIDEO_FIRST_LEVEL; 576 i < device->brightness->count; i++) 577 if (device->brightness->levels[i] == *level) { 578 device->brightness->curr = *level; 579 return 0; 580 } 581 /* 582 * BQC returned an invalid level. 583 * Stop using it. 584 */ 585 acpi_handle_info(device->dev->handle, 586 "%s returned an invalid level", buf); 587 device->cap._BQC = device->cap._BCQ = 0; 588 } else { 589 /* 590 * Fixme: 591 * should we return an error or ignore this failure? 592 * dev->brightness->curr is a cached value which stores 593 * the correct current backlight level in most cases. 594 * ACPI video backlight still works w/ buggy _BQC. 595 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 596 */ 597 acpi_handle_info(device->dev->handle, 598 "%s evaluation failed", buf); 599 device->cap._BQC = device->cap._BCQ = 0; 600 } 601 } 602 603 *level = device->brightness->curr; 604 return 0; 605 } 606 607 static int 608 acpi_video_device_EDID(struct acpi_video_device *device, 609 union acpi_object **edid, ssize_t length) 610 { 611 int status; 612 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 613 union acpi_object *obj; 614 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 615 struct acpi_object_list args = { 1, &arg0 }; 616 617 618 *edid = NULL; 619 620 if (!device) 621 return -ENODEV; 622 if (length == 128) 623 arg0.integer.value = 1; 624 else if (length == 256) 625 arg0.integer.value = 2; 626 else 627 return -EINVAL; 628 629 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 630 if (ACPI_FAILURE(status)) 631 return -ENODEV; 632 633 obj = buffer.pointer; 634 635 if (obj && obj->type == ACPI_TYPE_BUFFER) 636 *edid = obj; 637 else { 638 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); 639 status = -EFAULT; 640 kfree(obj); 641 } 642 643 return status; 644 } 645 646 /* bus */ 647 648 /* 649 * Arg: 650 * video : video bus device pointer 651 * bios_flag : 652 * 0. The system BIOS should NOT automatically switch(toggle) 653 * the active display output. 654 * 1. The system BIOS should automatically switch (toggle) the 655 * active display output. No switch event. 656 * 2. The _DGS value should be locked. 657 * 3. The system BIOS should not automatically switch (toggle) the 658 * active display output, but instead generate the display switch 659 * event notify code. 660 * lcd_flag : 661 * 0. The system BIOS should automatically control the brightness level 662 * of the LCD when: 663 * - the power changes from AC to DC (ACPI appendix B) 664 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 665 * 1. The system BIOS should NOT automatically control the brightness 666 * level of the LCD when: 667 * - the power changes from AC to DC (ACPI appendix B) 668 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 669 * Return Value: 670 * -EINVAL wrong arg. 671 */ 672 673 static int 674 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 675 { 676 acpi_status status; 677 678 if (!video->cap._DOS) 679 return 0; 680 681 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 682 return -EINVAL; 683 video->dos_setting = (lcd_flag << 2) | bios_flag; 684 status = acpi_execute_simple_method(video->device->handle, "_DOS", 685 (lcd_flag << 2) | bios_flag); 686 if (ACPI_FAILURE(status)) 687 return -EIO; 688 689 return 0; 690 } 691 692 /* 693 * Simple comparison function used to sort backlight levels. 694 */ 695 696 static int 697 acpi_video_cmp_level(const void *a, const void *b) 698 { 699 return *(int *)a - *(int *)b; 700 } 701 702 /* 703 * Decides if _BQC/_BCQ for this system is usable 704 * 705 * We do this by changing the level first and then read out the current 706 * brightness level, if the value does not match, find out if it is using 707 * index. If not, clear the _BQC/_BCQ capability. 708 */ 709 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 710 int max_level, int current_level) 711 { 712 struct acpi_video_device_brightness *br = device->brightness; 713 int result; 714 unsigned long long level; 715 int test_level; 716 717 /* don't mess with existing known broken systems */ 718 if (bqc_offset_aml_bug_workaround) 719 return 0; 720 721 /* 722 * Some systems always report current brightness level as maximum 723 * through _BQC, we need to test another value for them. However, 724 * there is a subtlety: 725 * 726 * If the _BCL package ordering is descending, the first level 727 * (br->levels[2]) is likely to be 0, and if the number of levels 728 * matches the number of steps, we might confuse a returned level to 729 * mean the index. 730 * 731 * For example: 732 * 733 * current_level = max_level = 100 734 * test_level = 0 735 * returned level = 100 736 * 737 * In this case 100 means the level, not the index, and _BCM failed. 738 * Still, if the _BCL package ordering is descending, the index of 739 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 740 * 741 * This causes all _BQC calls to return bogus values causing weird 742 * behavior from the user's perspective. For example: 743 * 744 * xbacklight -set 10; xbacklight -set 20; 745 * 746 * would flash to 90% and then slowly down to the desired level (20). 747 * 748 * The solution is simple; test anything other than the first level 749 * (e.g. 1). 750 */ 751 test_level = current_level == max_level 752 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 753 : max_level; 754 755 result = acpi_video_device_lcd_set_level(device, test_level); 756 if (result) 757 return result; 758 759 result = acpi_video_device_lcd_get_level_current(device, &level, true); 760 if (result) 761 return result; 762 763 if (level != test_level) { 764 /* buggy _BQC found, need to find out if it uses index */ 765 if (level < br->count) { 766 if (br->flags._BCL_reversed) 767 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 768 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 769 br->flags._BQC_use_index = 1; 770 } 771 772 if (!br->flags._BQC_use_index) 773 device->cap._BQC = device->cap._BCQ = 0; 774 } 775 776 return 0; 777 } 778 779 int acpi_video_get_levels(struct acpi_device *device, 780 struct acpi_video_device_brightness **dev_br, 781 int *pmax_level) 782 { 783 union acpi_object *obj = NULL; 784 int i, max_level = 0, count = 0, level_ac_battery = 0; 785 union acpi_object *o; 786 struct acpi_video_device_brightness *br = NULL; 787 int result = 0; 788 u32 value; 789 790 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 791 acpi_handle_debug(device->handle, 792 "Could not query available LCD brightness level\n"); 793 result = -ENODEV; 794 goto out; 795 } 796 797 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 798 result = -EINVAL; 799 goto out; 800 } 801 802 br = kzalloc(sizeof(*br), GFP_KERNEL); 803 if (!br) { 804 result = -ENOMEM; 805 goto out; 806 } 807 808 /* 809 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 810 * in order to account for buggy BIOS which don't export the first two 811 * special levels (see below) 812 */ 813 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 814 sizeof(*br->levels), 815 GFP_KERNEL); 816 if (!br->levels) { 817 result = -ENOMEM; 818 goto out_free; 819 } 820 821 for (i = 0; i < obj->package.count; i++) { 822 o = (union acpi_object *)&obj->package.elements[i]; 823 if (o->type != ACPI_TYPE_INTEGER) { 824 acpi_handle_info(device->handle, "Invalid data\n"); 825 continue; 826 } 827 value = (u32) o->integer.value; 828 /* Skip duplicate entries */ 829 if (count > ACPI_VIDEO_FIRST_LEVEL 830 && br->levels[count - 1] == value) 831 continue; 832 833 br->levels[count] = value; 834 835 if (br->levels[count] > max_level) 836 max_level = br->levels[count]; 837 count++; 838 } 839 840 /* 841 * some buggy BIOS don't export the levels 842 * when machine is on AC/Battery in _BCL package. 843 * In this case, the first two elements in _BCL packages 844 * are also supported brightness levels that OS should take care of. 845 */ 846 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 847 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 848 level_ac_battery++; 849 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 850 level_ac_battery++; 851 } 852 853 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 854 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 855 br->flags._BCL_no_ac_battery_levels = 1; 856 for (i = (count - 1 + level_ac_battery); 857 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 858 br->levels[i] = br->levels[i - level_ac_battery]; 859 count += level_ac_battery; 860 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 861 acpi_handle_info(device->handle, 862 "Too many duplicates in _BCL package"); 863 864 /* Check if the _BCL package is in a reversed order */ 865 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 866 br->flags._BCL_reversed = 1; 867 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 868 count - ACPI_VIDEO_FIRST_LEVEL, 869 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 870 acpi_video_cmp_level, NULL); 871 } else if (max_level != br->levels[count - 1]) 872 acpi_handle_info(device->handle, 873 "Found unordered _BCL package"); 874 875 br->count = count; 876 *dev_br = br; 877 if (pmax_level) 878 *pmax_level = max_level; 879 880 out: 881 kfree(obj); 882 return result; 883 out_free: 884 kfree(br); 885 goto out; 886 } 887 EXPORT_SYMBOL(acpi_video_get_levels); 888 889 /* 890 * Arg: 891 * device : video output device (LCD, CRT, ..) 892 * 893 * Return Value: 894 * Maximum brightness level 895 * 896 * Allocate and initialize device->brightness. 897 */ 898 899 static int 900 acpi_video_init_brightness(struct acpi_video_device *device) 901 { 902 int i, max_level = 0; 903 unsigned long long level, level_old; 904 struct acpi_video_device_brightness *br = NULL; 905 int result; 906 907 result = acpi_video_get_levels(device->dev, &br, &max_level); 908 if (result) 909 return result; 910 device->brightness = br; 911 912 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 913 br->curr = level = max_level; 914 915 if (!device->cap._BQC) 916 goto set_level; 917 918 result = acpi_video_device_lcd_get_level_current(device, 919 &level_old, true); 920 if (result) 921 goto out_free_levels; 922 923 result = acpi_video_bqc_quirk(device, max_level, level_old); 924 if (result) 925 goto out_free_levels; 926 /* 927 * cap._BQC may get cleared due to _BQC is found to be broken 928 * in acpi_video_bqc_quirk, so check again here. 929 */ 930 if (!device->cap._BQC) 931 goto set_level; 932 933 level = acpi_video_bqc_value_to_level(device, level_old); 934 /* 935 * On some buggy laptops, _BQC returns an uninitialized 936 * value when invoked for the first time, i.e. 937 * level_old is invalid (no matter whether it's a level 938 * or an index). Set the backlight to max_level in this case. 939 */ 940 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 941 if (level == br->levels[i]) 942 break; 943 if (i == br->count || !level) 944 level = max_level; 945 946 set_level: 947 result = acpi_video_device_lcd_set_level(device, level); 948 if (result) 949 goto out_free_levels; 950 951 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 952 br->count - ACPI_VIDEO_FIRST_LEVEL); 953 954 return 0; 955 956 out_free_levels: 957 kfree(br->levels); 958 kfree(br); 959 device->brightness = NULL; 960 return result; 961 } 962 963 /* 964 * Arg: 965 * device : video output device (LCD, CRT, ..) 966 * 967 * Return Value: 968 * None 969 * 970 * Find out all required AML methods defined under the output 971 * device. 972 */ 973 974 static void acpi_video_device_find_cap(struct acpi_video_device *device) 975 { 976 if (acpi_has_method(device->dev->handle, "_ADR")) 977 device->cap._ADR = 1; 978 if (acpi_has_method(device->dev->handle, "_BCL")) 979 device->cap._BCL = 1; 980 if (acpi_has_method(device->dev->handle, "_BCM")) 981 device->cap._BCM = 1; 982 if (acpi_has_method(device->dev->handle, "_BQC")) { 983 device->cap._BQC = 1; 984 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 985 acpi_handle_info(device->dev->handle, 986 "_BCQ is used instead of _BQC\n"); 987 device->cap._BCQ = 1; 988 } 989 990 if (acpi_has_method(device->dev->handle, "_DDC")) 991 device->cap._DDC = 1; 992 } 993 994 /* 995 * Arg: 996 * device : video output device (VGA) 997 * 998 * Return Value: 999 * None 1000 * 1001 * Find out all required AML methods defined under the video bus device. 1002 */ 1003 1004 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1005 { 1006 if (acpi_has_method(video->device->handle, "_DOS")) 1007 video->cap._DOS = 1; 1008 if (acpi_has_method(video->device->handle, "_DOD")) 1009 video->cap._DOD = 1; 1010 if (acpi_has_method(video->device->handle, "_ROM")) 1011 video->cap._ROM = 1; 1012 if (acpi_has_method(video->device->handle, "_GPD")) 1013 video->cap._GPD = 1; 1014 if (acpi_has_method(video->device->handle, "_SPD")) 1015 video->cap._SPD = 1; 1016 if (acpi_has_method(video->device->handle, "_VPO")) 1017 video->cap._VPO = 1; 1018 } 1019 1020 /* 1021 * Check whether the video bus device has required AML method to 1022 * support the desired features 1023 */ 1024 1025 static int acpi_video_bus_check(struct acpi_video_bus *video) 1026 { 1027 acpi_status status = -ENOENT; 1028 struct pci_dev *dev; 1029 1030 if (!video) 1031 return -EINVAL; 1032 1033 dev = acpi_get_pci_dev(video->device->handle); 1034 if (!dev) 1035 return -ENODEV; 1036 pci_dev_put(dev); 1037 1038 /* 1039 * Since there is no HID, CID and so on for VGA driver, we have 1040 * to check well known required nodes. 1041 */ 1042 1043 /* Does this device support video switching? */ 1044 if (video->cap._DOS || video->cap._DOD) { 1045 if (!video->cap._DOS) { 1046 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1047 acpi_device_bid(video->device)); 1048 } 1049 video->flags.multihead = 1; 1050 status = 0; 1051 } 1052 1053 /* Does this device support retrieving a video ROM? */ 1054 if (video->cap._ROM) { 1055 video->flags.rom = 1; 1056 status = 0; 1057 } 1058 1059 /* Does this device support configuring which video device to POST? */ 1060 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1061 video->flags.post = 1; 1062 status = 0; 1063 } 1064 1065 return status; 1066 } 1067 1068 /* 1069 * -------------------------------------------------------------------------- 1070 * Driver Interface 1071 * -------------------------------------------------------------------------- 1072 */ 1073 1074 /* device interface */ 1075 static struct acpi_video_device_attrib * 1076 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1077 { 1078 struct acpi_video_enumerated_device *ids; 1079 int i; 1080 1081 for (i = 0; i < video->attached_count; i++) { 1082 ids = &video->attached_array[i]; 1083 if ((ids->value.int_val & 0xffff) == device_id) 1084 return &ids->value.attrib; 1085 } 1086 1087 return NULL; 1088 } 1089 1090 static int 1091 acpi_video_get_device_type(struct acpi_video_bus *video, 1092 unsigned long device_id) 1093 { 1094 struct acpi_video_enumerated_device *ids; 1095 int i; 1096 1097 for (i = 0; i < video->attached_count; i++) { 1098 ids = &video->attached_array[i]; 1099 if ((ids->value.int_val & 0xffff) == device_id) 1100 return ids->value.int_val; 1101 } 1102 1103 return 0; 1104 } 1105 1106 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1107 { 1108 struct acpi_video_bus *video = arg; 1109 struct acpi_video_device_attrib *attribute; 1110 struct acpi_video_device *data; 1111 unsigned long long device_id; 1112 acpi_status status; 1113 int device_type; 1114 1115 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1116 /* Skip devices without _ADR instead of failing. */ 1117 if (ACPI_FAILURE(status)) 1118 goto exit; 1119 1120 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1121 if (!data) { 1122 dev_dbg(&device->dev, "Cannot attach\n"); 1123 return -ENOMEM; 1124 } 1125 1126 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1127 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1128 device->driver_data = data; 1129 1130 data->device_id = device_id; 1131 data->video = video; 1132 data->dev = device; 1133 INIT_DELAYED_WORK(&data->switch_brightness_work, 1134 acpi_video_switch_brightness); 1135 1136 attribute = acpi_video_get_device_attr(video, device_id); 1137 1138 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1139 switch (attribute->display_type) { 1140 case ACPI_VIDEO_DISPLAY_CRT: 1141 data->flags.crt = 1; 1142 break; 1143 case ACPI_VIDEO_DISPLAY_TV: 1144 data->flags.tvout = 1; 1145 break; 1146 case ACPI_VIDEO_DISPLAY_DVI: 1147 data->flags.dvi = 1; 1148 break; 1149 case ACPI_VIDEO_DISPLAY_LCD: 1150 data->flags.lcd = 1; 1151 break; 1152 default: 1153 data->flags.unknown = 1; 1154 break; 1155 } 1156 if (attribute->bios_can_detect) 1157 data->flags.bios = 1; 1158 } else { 1159 /* Check for legacy IDs */ 1160 device_type = acpi_video_get_device_type(video, device_id); 1161 /* Ignore bits 16 and 18-20 */ 1162 switch (device_type & 0xffe2ffff) { 1163 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1164 data->flags.crt = 1; 1165 break; 1166 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1167 data->flags.lcd = 1; 1168 break; 1169 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1170 data->flags.tvout = 1; 1171 break; 1172 default: 1173 data->flags.unknown = 1; 1174 } 1175 } 1176 1177 acpi_video_device_bind(video, data); 1178 acpi_video_device_find_cap(data); 1179 1180 if (data->cap._BCM && data->cap._BCL) 1181 may_report_brightness_keys = true; 1182 1183 mutex_lock(&video->device_list_lock); 1184 list_add_tail(&data->entry, &video->video_device_list); 1185 mutex_unlock(&video->device_list_lock); 1186 1187 exit: 1188 video->child_count++; 1189 return 0; 1190 } 1191 1192 /* 1193 * Arg: 1194 * video : video bus device 1195 * 1196 * Return: 1197 * none 1198 * 1199 * Enumerate the video device list of the video bus, 1200 * bind the ids with the corresponding video devices 1201 * under the video bus. 1202 */ 1203 1204 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1205 { 1206 struct acpi_video_device *dev; 1207 1208 mutex_lock(&video->device_list_lock); 1209 1210 list_for_each_entry(dev, &video->video_device_list, entry) 1211 acpi_video_device_bind(video, dev); 1212 1213 mutex_unlock(&video->device_list_lock); 1214 } 1215 1216 /* 1217 * Arg: 1218 * video : video bus device 1219 * device : video output device under the video 1220 * bus 1221 * 1222 * Return: 1223 * none 1224 * 1225 * Bind the ids with the corresponding video devices 1226 * under the video bus. 1227 */ 1228 1229 static void 1230 acpi_video_device_bind(struct acpi_video_bus *video, 1231 struct acpi_video_device *device) 1232 { 1233 struct acpi_video_enumerated_device *ids; 1234 int i; 1235 1236 for (i = 0; i < video->attached_count; i++) { 1237 ids = &video->attached_array[i]; 1238 if (device->device_id == (ids->value.int_val & 0xffff)) { 1239 ids->bind_info = device; 1240 acpi_handle_debug(video->device->handle, "%s: %d\n", 1241 __func__, i); 1242 } 1243 } 1244 } 1245 1246 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1247 { 1248 struct acpi_video_bus *video = device->video; 1249 int i; 1250 1251 /* 1252 * If we have a broken _DOD or we have more than 8 output devices 1253 * under the graphics controller node that we can't proper deal with 1254 * in the operation region code currently, no need to test. 1255 */ 1256 if (!video->attached_count || video->child_count > 8) 1257 return true; 1258 1259 for (i = 0; i < video->attached_count; i++) { 1260 if ((video->attached_array[i].value.int_val & 0xfff) == 1261 (device->device_id & 0xfff)) 1262 return true; 1263 } 1264 1265 return false; 1266 } 1267 1268 /* 1269 * Arg: 1270 * video : video bus device 1271 * 1272 * Return: 1273 * < 0 : error 1274 * 1275 * Call _DOD to enumerate all devices attached to display adapter 1276 * 1277 */ 1278 1279 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1280 { 1281 int status; 1282 int count; 1283 int i; 1284 struct acpi_video_enumerated_device *active_list; 1285 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1286 union acpi_object *dod = NULL; 1287 union acpi_object *obj; 1288 1289 if (!video->cap._DOD) 1290 return AE_NOT_EXIST; 1291 1292 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1293 if (ACPI_FAILURE(status)) { 1294 acpi_handle_info(video->device->handle, 1295 "_DOD evaluation failed: %s\n", 1296 acpi_format_exception(status)); 1297 return status; 1298 } 1299 1300 dod = buffer.pointer; 1301 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1302 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1303 status = -EFAULT; 1304 goto out; 1305 } 1306 1307 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1308 dod->package.count); 1309 1310 active_list = kcalloc(1 + dod->package.count, 1311 sizeof(struct acpi_video_enumerated_device), 1312 GFP_KERNEL); 1313 if (!active_list) { 1314 status = -ENOMEM; 1315 goto out; 1316 } 1317 1318 count = 0; 1319 for (i = 0; i < dod->package.count; i++) { 1320 obj = &dod->package.elements[i]; 1321 1322 if (obj->type != ACPI_TYPE_INTEGER) { 1323 acpi_handle_info(video->device->handle, 1324 "Invalid _DOD data in element %d\n", i); 1325 continue; 1326 } 1327 1328 active_list[count].value.int_val = obj->integer.value; 1329 active_list[count].bind_info = NULL; 1330 1331 acpi_handle_debug(video->device->handle, 1332 "_DOD element[%d] = %d\n", i, 1333 (int)obj->integer.value); 1334 1335 count++; 1336 } 1337 1338 kfree(video->attached_array); 1339 1340 video->attached_array = active_list; 1341 video->attached_count = count; 1342 1343 out: 1344 kfree(buffer.pointer); 1345 return status; 1346 } 1347 1348 static int 1349 acpi_video_get_next_level(struct acpi_video_device *device, 1350 u32 level_current, u32 event) 1351 { 1352 int min, max, min_above, max_below, i, l, delta = 255; 1353 max = max_below = 0; 1354 min = min_above = 255; 1355 /* Find closest level to level_current */ 1356 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1357 l = device->brightness->levels[i]; 1358 if (abs(l - level_current) < abs(delta)) { 1359 delta = l - level_current; 1360 if (!delta) 1361 break; 1362 } 1363 } 1364 /* Adjust level_current to closest available level */ 1365 level_current += delta; 1366 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1367 l = device->brightness->levels[i]; 1368 if (l < min) 1369 min = l; 1370 if (l > max) 1371 max = l; 1372 if (l < min_above && l > level_current) 1373 min_above = l; 1374 if (l > max_below && l < level_current) 1375 max_below = l; 1376 } 1377 1378 switch (event) { 1379 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1380 return (level_current < max) ? min_above : min; 1381 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1382 return (level_current < max) ? min_above : max; 1383 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1384 return (level_current > min) ? max_below : min; 1385 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1386 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1387 return 0; 1388 default: 1389 return level_current; 1390 } 1391 } 1392 1393 static void 1394 acpi_video_switch_brightness(struct work_struct *work) 1395 { 1396 struct acpi_video_device *device = container_of(to_delayed_work(work), 1397 struct acpi_video_device, switch_brightness_work); 1398 unsigned long long level_current, level_next; 1399 int event = device->switch_brightness_event; 1400 int result = -EINVAL; 1401 1402 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1403 if (!device->backlight) 1404 return; 1405 1406 if (!device->brightness) 1407 goto out; 1408 1409 result = acpi_video_device_lcd_get_level_current(device, 1410 &level_current, 1411 false); 1412 if (result) 1413 goto out; 1414 1415 level_next = acpi_video_get_next_level(device, level_current, event); 1416 1417 result = acpi_video_device_lcd_set_level(device, level_next); 1418 1419 if (!result) 1420 backlight_force_update(device->backlight, 1421 BACKLIGHT_UPDATE_HOTKEY); 1422 1423 out: 1424 if (result) 1425 acpi_handle_info(device->dev->handle, 1426 "Failed to switch brightness\n"); 1427 } 1428 1429 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1430 void **edid) 1431 { 1432 struct acpi_video_bus *video; 1433 struct acpi_video_device *video_device; 1434 union acpi_object *buffer = NULL; 1435 acpi_status status; 1436 int i, length; 1437 1438 if (!device || !acpi_driver_data(device)) 1439 return -EINVAL; 1440 1441 video = acpi_driver_data(device); 1442 1443 for (i = 0; i < video->attached_count; i++) { 1444 video_device = video->attached_array[i].bind_info; 1445 length = 256; 1446 1447 if (!video_device) 1448 continue; 1449 1450 if (!video_device->cap._DDC) 1451 continue; 1452 1453 if (type) { 1454 switch (type) { 1455 case ACPI_VIDEO_DISPLAY_CRT: 1456 if (!video_device->flags.crt) 1457 continue; 1458 break; 1459 case ACPI_VIDEO_DISPLAY_TV: 1460 if (!video_device->flags.tvout) 1461 continue; 1462 break; 1463 case ACPI_VIDEO_DISPLAY_DVI: 1464 if (!video_device->flags.dvi) 1465 continue; 1466 break; 1467 case ACPI_VIDEO_DISPLAY_LCD: 1468 if (!video_device->flags.lcd) 1469 continue; 1470 break; 1471 } 1472 } else if (video_device->device_id != device_id) { 1473 continue; 1474 } 1475 1476 status = acpi_video_device_EDID(video_device, &buffer, length); 1477 1478 if (ACPI_FAILURE(status) || !buffer || 1479 buffer->type != ACPI_TYPE_BUFFER) { 1480 length = 128; 1481 status = acpi_video_device_EDID(video_device, &buffer, 1482 length); 1483 if (ACPI_FAILURE(status) || !buffer || 1484 buffer->type != ACPI_TYPE_BUFFER) { 1485 continue; 1486 } 1487 } 1488 1489 *edid = buffer->buffer.pointer; 1490 return length; 1491 } 1492 1493 return -ENODEV; 1494 } 1495 EXPORT_SYMBOL(acpi_video_get_edid); 1496 1497 static int 1498 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1499 struct acpi_device *device) 1500 { 1501 /* 1502 * There are systems where video module known to work fine regardless 1503 * of broken _DOD and ignoring returned value here doesn't cause 1504 * any issues later. 1505 */ 1506 acpi_video_device_enumerate(video); 1507 1508 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1509 } 1510 1511 /* acpi_video interface */ 1512 1513 /* 1514 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1515 * perform any automatic brightness change on receiving a notification. 1516 */ 1517 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1518 { 1519 return acpi_video_bus_DOS(video, 0, 1520 acpi_osi_is_win8() ? 1 : 0); 1521 } 1522 1523 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1524 { 1525 return acpi_video_bus_DOS(video, 0, 1526 acpi_osi_is_win8() ? 0 : 1); 1527 } 1528 1529 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data) 1530 { 1531 struct acpi_device *device = data; 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 /* 2031 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0 2032 * evaluated to have functional panel brightness control. 2033 */ 2034 acpi_device_fix_up_power_extended(device); 2035 2036 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2037 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2038 video->flags.multihead ? "yes" : "no", 2039 video->flags.rom ? "yes" : "no", 2040 video->flags.post ? "yes" : "no"); 2041 mutex_lock(&video_list_lock); 2042 list_add_tail(&video->entry, &video_bus_head); 2043 mutex_unlock(&video_list_lock); 2044 2045 /* 2046 * If backlight-type auto-detection is used then a native backlight may 2047 * show up later and this may change the result from video to native. 2048 * Therefor normally the userspace visible /sys/class/backlight device 2049 * gets registered separately by the GPU driver calling 2050 * acpi_video_register_backlight() when an internal panel is detected. 2051 * Register the backlight now when not using auto-detection, so that 2052 * when the kernel cmdline or DMI-quirks are used the backlight will 2053 * get registered even if acpi_video_register_backlight() is not called. 2054 */ 2055 acpi_video_run_bcl_for_osi(video); 2056 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && 2057 !auto_detect) 2058 acpi_video_bus_register_backlight(video); 2059 2060 error = acpi_video_bus_add_notify_handler(video); 2061 if (error) 2062 goto err_del; 2063 2064 error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, 2065 acpi_video_bus_notify); 2066 if (error) 2067 goto err_remove; 2068 2069 return 0; 2070 2071 err_remove: 2072 acpi_video_bus_remove_notify_handler(video); 2073 err_del: 2074 mutex_lock(&video_list_lock); 2075 list_del(&video->entry); 2076 mutex_unlock(&video_list_lock); 2077 acpi_video_bus_unregister_backlight(video); 2078 err_put_video: 2079 acpi_video_bus_put_devices(video); 2080 kfree(video->attached_array); 2081 err_free_video: 2082 kfree(video); 2083 device->driver_data = NULL; 2084 2085 return error; 2086 } 2087 2088 static void acpi_video_bus_remove(struct acpi_device *device) 2089 { 2090 struct acpi_video_bus *video = NULL; 2091 2092 2093 if (!device || !acpi_driver_data(device)) 2094 return; 2095 2096 video = acpi_driver_data(device); 2097 2098 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, 2099 acpi_video_bus_notify); 2100 2101 mutex_lock(&video_list_lock); 2102 list_del(&video->entry); 2103 mutex_unlock(&video_list_lock); 2104 2105 acpi_video_bus_remove_notify_handler(video); 2106 acpi_video_bus_unregister_backlight(video); 2107 acpi_video_bus_put_devices(video); 2108 2109 kfree(video->attached_array); 2110 kfree(video); 2111 } 2112 2113 static int __init is_i740(struct pci_dev *dev) 2114 { 2115 if (dev->device == 0x00D1) 2116 return 1; 2117 if (dev->device == 0x7000) 2118 return 1; 2119 return 0; 2120 } 2121 2122 static int __init intel_opregion_present(void) 2123 { 2124 int opregion = 0; 2125 struct pci_dev *dev = NULL; 2126 u32 address; 2127 2128 for_each_pci_dev(dev) { 2129 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2130 continue; 2131 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2132 continue; 2133 /* We don't want to poke around undefined i740 registers */ 2134 if (is_i740(dev)) 2135 continue; 2136 pci_read_config_dword(dev, 0xfc, &address); 2137 if (!address) 2138 continue; 2139 opregion = 1; 2140 } 2141 return opregion; 2142 } 2143 2144 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2145 static bool dmi_is_desktop(void) 2146 { 2147 const char *chassis_type; 2148 unsigned long type; 2149 2150 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2151 if (!chassis_type) 2152 return false; 2153 2154 if (kstrtoul(chassis_type, 10, &type) != 0) 2155 return false; 2156 2157 switch (type) { 2158 case 0x03: /* Desktop */ 2159 case 0x04: /* Low Profile Desktop */ 2160 case 0x05: /* Pizza Box */ 2161 case 0x06: /* Mini Tower */ 2162 case 0x07: /* Tower */ 2163 case 0x10: /* Lunch Box */ 2164 case 0x11: /* Main Server Chassis */ 2165 return true; 2166 } 2167 2168 return false; 2169 } 2170 2171 /* 2172 * We're seeing a lot of bogus backlight interfaces on newer machines 2173 * without a LCD such as desktops, servers and HDMI sticks. Checking the 2174 * lcd flag fixes this, enable this by default on any machines which are: 2175 * 1. Win8 ready (where we also prefer the native backlight driver, so 2176 * normally the acpi_video code should not register there anyways); *and* 2177 * 2.1 Report a desktop/server DMI chassis-type, or 2178 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for 2179 backlight control) 2180 */ 2181 static bool should_check_lcd_flag(void) 2182 { 2183 if (!acpi_osi_is_win8()) 2184 return false; 2185 2186 if (dmi_is_desktop()) 2187 return true; 2188 2189 if (acpi_reduced_hardware()) 2190 return true; 2191 2192 return false; 2193 } 2194 2195 int acpi_video_register(void) 2196 { 2197 int ret = 0; 2198 2199 mutex_lock(®ister_count_mutex); 2200 if (register_count) { 2201 /* 2202 * if the function of acpi_video_register is already called, 2203 * don't register the acpi_video_bus again and return no error. 2204 */ 2205 goto leave; 2206 } 2207 2208 if (only_lcd == -1) 2209 only_lcd = should_check_lcd_flag(); 2210 2211 dmi_check_system(video_dmi_table); 2212 2213 ret = acpi_bus_register_driver(&acpi_video_bus); 2214 if (ret) 2215 goto leave; 2216 2217 /* 2218 * When the acpi_video_bus is loaded successfully, increase 2219 * the counter reference. 2220 */ 2221 register_count = 1; 2222 2223 leave: 2224 mutex_unlock(®ister_count_mutex); 2225 return ret; 2226 } 2227 EXPORT_SYMBOL(acpi_video_register); 2228 2229 void acpi_video_unregister(void) 2230 { 2231 mutex_lock(®ister_count_mutex); 2232 if (register_count) { 2233 acpi_bus_unregister_driver(&acpi_video_bus); 2234 register_count = 0; 2235 may_report_brightness_keys = false; 2236 } 2237 mutex_unlock(®ister_count_mutex); 2238 } 2239 EXPORT_SYMBOL(acpi_video_unregister); 2240 2241 void acpi_video_register_backlight(void) 2242 { 2243 struct acpi_video_bus *video; 2244 2245 mutex_lock(&video_list_lock); 2246 list_for_each_entry(video, &video_bus_head, entry) 2247 acpi_video_bus_register_backlight(video); 2248 mutex_unlock(&video_list_lock); 2249 } 2250 EXPORT_SYMBOL(acpi_video_register_backlight); 2251 2252 bool acpi_video_handles_brightness_key_presses(void) 2253 { 2254 return may_report_brightness_keys && 2255 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2256 } 2257 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2258 2259 /* 2260 * This is kind of nasty. Hardware using Intel chipsets may require 2261 * the video opregion code to be run first in order to initialise 2262 * state before any ACPI video calls are made. To handle this we defer 2263 * registration of the video class until the opregion code has run. 2264 */ 2265 2266 static int __init acpi_video_init(void) 2267 { 2268 /* 2269 * Let the module load even if ACPI is disabled (e.g. due to 2270 * a broken BIOS) so that i915.ko can still be loaded on such 2271 * old systems without an AcpiOpRegion. 2272 * 2273 * acpi_video_register() will report -ENODEV later as well due 2274 * to acpi_disabled when i915.ko tries to register itself afterwards. 2275 */ 2276 if (acpi_disabled) 2277 return 0; 2278 2279 if (intel_opregion_present()) 2280 return 0; 2281 2282 return acpi_video_register(); 2283 } 2284 2285 static void __exit acpi_video_exit(void) 2286 { 2287 acpi_video_unregister(); 2288 } 2289 2290 module_init(acpi_video_init); 2291 module_exit(acpi_video_exit); 2292