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 static int disable_backlight_sysfs_if = -1; 51 module_param(disable_backlight_sysfs_if, int, 0444); 52 53 #define REPORT_OUTPUT_KEY_EVENTS 0x01 54 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 55 static int report_key_events = -1; 56 module_param(report_key_events, int, 0644); 57 MODULE_PARM_DESC(report_key_events, 58 "0: none, 1: output changes, 2: brightness changes, 3: all"); 59 60 static int hw_changes_brightness = -1; 61 module_param(hw_changes_brightness, int, 0644); 62 MODULE_PARM_DESC(hw_changes_brightness, 63 "Set this to 1 on buggy hw which changes the brightness itself when " 64 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); 65 66 /* 67 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 68 * assumed even if not actually set. 69 */ 70 static bool device_id_scheme = false; 71 module_param(device_id_scheme, bool, 0444); 72 73 static int only_lcd = -1; 74 module_param(only_lcd, int, 0444); 75 76 static int register_count; 77 static DEFINE_MUTEX(register_count_mutex); 78 static DEFINE_MUTEX(video_list_lock); 79 static LIST_HEAD(video_bus_head); 80 static int acpi_video_bus_add(struct acpi_device *device); 81 static int acpi_video_bus_remove(struct acpi_device *device); 82 static void acpi_video_bus_notify(struct acpi_device *device, u32 event); 83 void acpi_video_detect_exit(void); 84 85 /* 86 * Indices in the _BCL method response: the first two items are special, 87 * the rest are all supported levels. 88 * 89 * See page 575 of the ACPI spec 3.0 90 */ 91 enum acpi_video_level_idx { 92 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 93 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 94 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 95 }; 96 97 static const struct acpi_device_id video_device_ids[] = { 98 {ACPI_VIDEO_HID, 0}, 99 {"", 0}, 100 }; 101 MODULE_DEVICE_TABLE(acpi, video_device_ids); 102 103 static struct acpi_driver acpi_video_bus = { 104 .name = "video", 105 .class = ACPI_VIDEO_CLASS, 106 .ids = video_device_ids, 107 .ops = { 108 .add = acpi_video_bus_add, 109 .remove = acpi_video_bus_remove, 110 .notify = acpi_video_bus_notify, 111 }, 112 }; 113 114 struct acpi_video_bus_flags { 115 u8 multihead:1; /* can switch video heads */ 116 u8 rom:1; /* can retrieve a video rom */ 117 u8 post:1; /* can configure the head to */ 118 u8 reserved:5; 119 }; 120 121 struct acpi_video_bus_cap { 122 u8 _DOS:1; /* Enable/Disable output switching */ 123 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 124 u8 _ROM:1; /* Get ROM Data */ 125 u8 _GPD:1; /* Get POST Device */ 126 u8 _SPD:1; /* Set POST Device */ 127 u8 _VPO:1; /* Video POST Options */ 128 u8 reserved:2; 129 }; 130 131 struct acpi_video_device_attrib { 132 u32 display_index:4; /* A zero-based instance of the Display */ 133 u32 display_port_attachment:4; /* This field differentiates the display type */ 134 u32 display_type:4; /* Describe the specific type in use */ 135 u32 vendor_specific:4; /* Chipset Vendor Specific */ 136 u32 bios_can_detect:1; /* BIOS can detect the device */ 137 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 138 the VGA device. */ 139 u32 pipe_id:3; /* For VGA multiple-head devices. */ 140 u32 reserved:10; /* Must be 0 */ 141 142 /* 143 * The device ID might not actually follow the scheme described by this 144 * struct acpi_video_device_attrib. If it does, then this bit 145 * device_id_scheme is set; otherwise, other fields should be ignored. 146 * 147 * (but also see the global flag device_id_scheme) 148 */ 149 u32 device_id_scheme:1; 150 }; 151 152 struct acpi_video_enumerated_device { 153 union { 154 u32 int_val; 155 struct acpi_video_device_attrib attrib; 156 } value; 157 struct acpi_video_device *bind_info; 158 }; 159 160 struct acpi_video_bus { 161 struct acpi_device *device; 162 bool backlight_registered; 163 u8 dos_setting; 164 struct acpi_video_enumerated_device *attached_array; 165 u8 attached_count; 166 u8 child_count; 167 struct acpi_video_bus_cap cap; 168 struct acpi_video_bus_flags flags; 169 struct list_head video_device_list; 170 struct mutex device_list_lock; /* protects video_device_list */ 171 struct list_head entry; 172 struct input_dev *input; 173 char phys[32]; /* for input device */ 174 struct notifier_block pm_nb; 175 }; 176 177 struct acpi_video_device_flags { 178 u8 crt:1; 179 u8 lcd:1; 180 u8 tvout:1; 181 u8 dvi:1; 182 u8 bios:1; 183 u8 unknown:1; 184 u8 notify:1; 185 u8 reserved:1; 186 }; 187 188 struct acpi_video_device_cap { 189 u8 _ADR:1; /* Return the unique ID */ 190 u8 _BCL:1; /* Query list of brightness control levels supported */ 191 u8 _BCM:1; /* Set the brightness level */ 192 u8 _BQC:1; /* Get current brightness level */ 193 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 194 u8 _DDC:1; /* Return the EDID for this device */ 195 }; 196 197 struct acpi_video_device { 198 unsigned long device_id; 199 struct acpi_video_device_flags flags; 200 struct acpi_video_device_cap cap; 201 struct list_head entry; 202 struct delayed_work switch_brightness_work; 203 int switch_brightness_event; 204 struct acpi_video_bus *video; 205 struct acpi_device *dev; 206 struct acpi_video_device_brightness *brightness; 207 struct backlight_device *backlight; 208 struct thermal_cooling_device *cooling_dev; 209 }; 210 211 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 212 static void acpi_video_device_rebind(struct acpi_video_bus *video); 213 static void acpi_video_device_bind(struct acpi_video_bus *video, 214 struct acpi_video_device *device); 215 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 216 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 217 int level); 218 static int acpi_video_device_lcd_get_level_current( 219 struct acpi_video_device *device, 220 unsigned long long *level, bool raw); 221 static int acpi_video_get_next_level(struct acpi_video_device *device, 222 u32 level_current, u32 event); 223 static void acpi_video_switch_brightness(struct work_struct *work); 224 225 /* backlight device sysfs support */ 226 static int acpi_video_get_brightness(struct backlight_device *bd) 227 { 228 unsigned long long cur_level; 229 int i; 230 struct acpi_video_device *vd = bl_get_data(bd); 231 232 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 233 return -EINVAL; 234 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 235 if (vd->brightness->levels[i] == cur_level) 236 return i - ACPI_VIDEO_FIRST_LEVEL; 237 } 238 return 0; 239 } 240 241 static int acpi_video_set_brightness(struct backlight_device *bd) 242 { 243 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 244 struct acpi_video_device *vd = bl_get_data(bd); 245 246 cancel_delayed_work(&vd->switch_brightness_work); 247 return acpi_video_device_lcd_set_level(vd, 248 vd->brightness->levels[request_level]); 249 } 250 251 static const struct backlight_ops acpi_backlight_ops = { 252 .get_brightness = acpi_video_get_brightness, 253 .update_status = acpi_video_set_brightness, 254 }; 255 256 /* thermal cooling device callbacks */ 257 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 258 unsigned long *state) 259 { 260 struct acpi_device *device = cooling_dev->devdata; 261 struct acpi_video_device *video = acpi_driver_data(device); 262 263 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 264 return 0; 265 } 266 267 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 268 unsigned long *state) 269 { 270 struct acpi_device *device = cooling_dev->devdata; 271 struct acpi_video_device *video = acpi_driver_data(device); 272 unsigned long long level; 273 int offset; 274 275 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 276 return -EINVAL; 277 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 278 offset++) 279 if (level == video->brightness->levels[offset]) { 280 *state = video->brightness->count - offset - 1; 281 return 0; 282 } 283 284 return -EINVAL; 285 } 286 287 static int 288 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 289 { 290 struct acpi_device *device = cooling_dev->devdata; 291 struct acpi_video_device *video = acpi_driver_data(device); 292 int level; 293 294 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 295 return -EINVAL; 296 297 state = video->brightness->count - state; 298 level = video->brightness->levels[state - 1]; 299 return acpi_video_device_lcd_set_level(video, level); 300 } 301 302 static const struct thermal_cooling_device_ops video_cooling_ops = { 303 .get_max_state = video_get_max_state, 304 .get_cur_state = video_get_cur_state, 305 .set_cur_state = video_set_cur_state, 306 }; 307 308 /* 309 * -------------------------------------------------------------------------- 310 * Video Management 311 * -------------------------------------------------------------------------- 312 */ 313 314 static int 315 acpi_video_device_lcd_query_levels(acpi_handle handle, 316 union acpi_object **levels) 317 { 318 int status; 319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 320 union acpi_object *obj; 321 322 323 *levels = NULL; 324 325 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 326 if (ACPI_FAILURE(status)) 327 return status; 328 obj = (union acpi_object *)buffer.pointer; 329 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 330 acpi_handle_info(handle, "Invalid _BCL data\n"); 331 status = -EFAULT; 332 goto err; 333 } 334 335 *levels = obj; 336 337 return 0; 338 339 err: 340 kfree(buffer.pointer); 341 342 return status; 343 } 344 345 static int 346 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 347 { 348 int status; 349 int state; 350 351 status = acpi_execute_simple_method(device->dev->handle, 352 "_BCM", level); 353 if (ACPI_FAILURE(status)) { 354 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n"); 355 return -EIO; 356 } 357 358 device->brightness->curr = level; 359 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 360 state++) 361 if (level == device->brightness->levels[state]) { 362 if (device->backlight) 363 device->backlight->props.brightness = 364 state - ACPI_VIDEO_FIRST_LEVEL; 365 return 0; 366 } 367 368 acpi_handle_info(device->dev->handle, "Current brightness invalid\n"); 369 return -EINVAL; 370 } 371 372 /* 373 * For some buggy _BQC methods, we need to add a constant value to 374 * the _BQC return value to get the actual current brightness level 375 */ 376 377 static int bqc_offset_aml_bug_workaround; 378 static int video_set_bqc_offset(const struct dmi_system_id *d) 379 { 380 bqc_offset_aml_bug_workaround = 9; 381 return 0; 382 } 383 384 static int video_disable_backlight_sysfs_if( 385 const struct dmi_system_id *d) 386 { 387 if (disable_backlight_sysfs_if == -1) 388 disable_backlight_sysfs_if = 1; 389 return 0; 390 } 391 392 static int video_set_device_id_scheme(const struct dmi_system_id *d) 393 { 394 device_id_scheme = true; 395 return 0; 396 } 397 398 static int video_enable_only_lcd(const struct dmi_system_id *d) 399 { 400 only_lcd = true; 401 return 0; 402 } 403 404 static int video_set_report_key_events(const struct dmi_system_id *id) 405 { 406 if (report_key_events == -1) 407 report_key_events = (uintptr_t)id->driver_data; 408 return 0; 409 } 410 411 static int video_hw_changes_brightness( 412 const struct dmi_system_id *d) 413 { 414 if (hw_changes_brightness == -1) 415 hw_changes_brightness = 1; 416 return 0; 417 } 418 419 static const struct dmi_system_id video_dmi_table[] = { 420 /* 421 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 422 */ 423 { 424 .callback = video_set_bqc_offset, 425 .ident = "Acer Aspire 5720", 426 .matches = { 427 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 428 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 429 }, 430 }, 431 { 432 .callback = video_set_bqc_offset, 433 .ident = "Acer Aspire 5710Z", 434 .matches = { 435 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 436 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 437 }, 438 }, 439 { 440 .callback = video_set_bqc_offset, 441 .ident = "eMachines E510", 442 .matches = { 443 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 444 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 445 }, 446 }, 447 { 448 .callback = video_set_bqc_offset, 449 .ident = "Acer Aspire 5315", 450 .matches = { 451 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 452 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 453 }, 454 }, 455 { 456 .callback = video_set_bqc_offset, 457 .ident = "Acer Aspire 7720", 458 .matches = { 459 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 460 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 461 }, 462 }, 463 464 /* 465 * Some machines have a broken acpi-video interface for brightness 466 * control, but still need an acpi_video_device_lcd_set_level() call 467 * on resume to turn the backlight power on. We Enable backlight 468 * control on these systems, but do not register a backlight sysfs 469 * as brightness control does not work. 470 */ 471 { 472 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 473 .callback = video_disable_backlight_sysfs_if, 474 .ident = "Toshiba Portege R700", 475 .matches = { 476 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 477 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"), 478 }, 479 }, 480 { 481 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */ 482 .callback = video_disable_backlight_sysfs_if, 483 .ident = "Toshiba Portege R830", 484 .matches = { 485 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 486 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"), 487 }, 488 }, 489 { 490 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 491 .callback = video_disable_backlight_sysfs_if, 492 .ident = "Toshiba Satellite R830", 493 .matches = { 494 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 495 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"), 496 }, 497 }, 498 /* 499 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 500 * but the IDs actually follow the Device ID Scheme. 501 */ 502 { 503 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 504 .callback = video_set_device_id_scheme, 505 .ident = "ESPRIMO Mobile M9410", 506 .matches = { 507 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 508 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 509 }, 510 }, 511 /* 512 * Some machines have multiple video output devices, but only the one 513 * that is the type of LCD can do the backlight control so we should not 514 * register backlight interface for other video output devices. 515 */ 516 { 517 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 518 .callback = video_enable_only_lcd, 519 .ident = "ESPRIMO Mobile M9410", 520 .matches = { 521 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 522 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 523 }, 524 }, 525 /* 526 * Some machines report wrong key events on the acpi-bus, suppress 527 * key event reporting on these. Note this is only intended to work 528 * around events which are plain wrong. In some cases we get double 529 * events, in this case acpi-video is considered the canonical source 530 * and the events from the other source should be filtered. E.g. 531 * by calling acpi_video_handles_brightness_key_presses() from the 532 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 533 */ 534 { 535 .callback = video_set_report_key_events, 536 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 537 .ident = "Dell Vostro V131", 538 .matches = { 539 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 540 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 541 }, 542 }, 543 /* 544 * Some machines change the brightness themselves when a brightness 545 * hotkey gets pressed, despite us telling them not to. In this case 546 * acpi_video_device_notify() should only call backlight_force_update( 547 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 548 */ 549 { 550 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 551 .callback = video_hw_changes_brightness, 552 .ident = "Packard Bell EasyNote MZ35", 553 .matches = { 554 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 555 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 556 }, 557 }, 558 {} 559 }; 560 561 static unsigned long long 562 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 563 unsigned long long bqc_value) 564 { 565 unsigned long long level; 566 567 if (device->brightness->flags._BQC_use_index) { 568 /* 569 * _BQC returns an index that doesn't account for the first 2 570 * items with special meaning (see enum acpi_video_level_idx), 571 * so we need to compensate for that by offsetting ourselves 572 */ 573 if (device->brightness->flags._BCL_reversed) 574 bqc_value = device->brightness->count - 575 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 576 577 level = device->brightness->levels[bqc_value + 578 ACPI_VIDEO_FIRST_LEVEL]; 579 } else { 580 level = bqc_value; 581 } 582 583 level += bqc_offset_aml_bug_workaround; 584 585 return level; 586 } 587 588 static int 589 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 590 unsigned long long *level, bool raw) 591 { 592 acpi_status status = AE_OK; 593 int i; 594 595 if (device->cap._BQC || device->cap._BCQ) { 596 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 597 598 status = acpi_evaluate_integer(device->dev->handle, buf, 599 NULL, level); 600 if (ACPI_SUCCESS(status)) { 601 if (raw) { 602 /* 603 * Caller has indicated he wants the raw 604 * value returned by _BQC, so don't furtherly 605 * mess with the value. 606 */ 607 return 0; 608 } 609 610 *level = acpi_video_bqc_value_to_level(device, *level); 611 612 for (i = ACPI_VIDEO_FIRST_LEVEL; 613 i < device->brightness->count; i++) 614 if (device->brightness->levels[i] == *level) { 615 device->brightness->curr = *level; 616 return 0; 617 } 618 /* 619 * BQC returned an invalid level. 620 * Stop using it. 621 */ 622 acpi_handle_info(device->dev->handle, 623 "%s returned an invalid level", buf); 624 device->cap._BQC = device->cap._BCQ = 0; 625 } else { 626 /* 627 * Fixme: 628 * should we return an error or ignore this failure? 629 * dev->brightness->curr is a cached value which stores 630 * the correct current backlight level in most cases. 631 * ACPI video backlight still works w/ buggy _BQC. 632 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 633 */ 634 acpi_handle_info(device->dev->handle, 635 "%s evaluation failed", buf); 636 device->cap._BQC = device->cap._BCQ = 0; 637 } 638 } 639 640 *level = device->brightness->curr; 641 return 0; 642 } 643 644 static int 645 acpi_video_device_EDID(struct acpi_video_device *device, 646 union acpi_object **edid, ssize_t length) 647 { 648 int status; 649 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 650 union acpi_object *obj; 651 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 652 struct acpi_object_list args = { 1, &arg0 }; 653 654 655 *edid = NULL; 656 657 if (!device) 658 return -ENODEV; 659 if (length == 128) 660 arg0.integer.value = 1; 661 else if (length == 256) 662 arg0.integer.value = 2; 663 else 664 return -EINVAL; 665 666 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 667 if (ACPI_FAILURE(status)) 668 return -ENODEV; 669 670 obj = buffer.pointer; 671 672 if (obj && obj->type == ACPI_TYPE_BUFFER) 673 *edid = obj; 674 else { 675 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); 676 status = -EFAULT; 677 kfree(obj); 678 } 679 680 return status; 681 } 682 683 /* bus */ 684 685 /* 686 * Arg: 687 * video : video bus device pointer 688 * bios_flag : 689 * 0. The system BIOS should NOT automatically switch(toggle) 690 * the active display output. 691 * 1. The system BIOS should automatically switch (toggle) the 692 * active display output. No switch event. 693 * 2. The _DGS value should be locked. 694 * 3. The system BIOS should not automatically switch (toggle) the 695 * active display output, but instead generate the display switch 696 * event notify code. 697 * lcd_flag : 698 * 0. The system BIOS should automatically control the brightness level 699 * of the LCD when: 700 * - the power changes from AC to DC (ACPI appendix B) 701 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 702 * 1. The system BIOS should NOT automatically control the brightness 703 * level of the LCD when: 704 * - the power changes from AC to DC (ACPI appendix B) 705 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 706 * Return Value: 707 * -EINVAL wrong arg. 708 */ 709 710 static int 711 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 712 { 713 acpi_status status; 714 715 if (!video->cap._DOS) 716 return 0; 717 718 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 719 return -EINVAL; 720 video->dos_setting = (lcd_flag << 2) | bios_flag; 721 status = acpi_execute_simple_method(video->device->handle, "_DOS", 722 (lcd_flag << 2) | bios_flag); 723 if (ACPI_FAILURE(status)) 724 return -EIO; 725 726 return 0; 727 } 728 729 /* 730 * Simple comparison function used to sort backlight levels. 731 */ 732 733 static int 734 acpi_video_cmp_level(const void *a, const void *b) 735 { 736 return *(int *)a - *(int *)b; 737 } 738 739 /* 740 * Decides if _BQC/_BCQ for this system is usable 741 * 742 * We do this by changing the level first and then read out the current 743 * brightness level, if the value does not match, find out if it is using 744 * index. If not, clear the _BQC/_BCQ capability. 745 */ 746 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 747 int max_level, int current_level) 748 { 749 struct acpi_video_device_brightness *br = device->brightness; 750 int result; 751 unsigned long long level; 752 int test_level; 753 754 /* don't mess with existing known broken systems */ 755 if (bqc_offset_aml_bug_workaround) 756 return 0; 757 758 /* 759 * Some systems always report current brightness level as maximum 760 * through _BQC, we need to test another value for them. However, 761 * there is a subtlety: 762 * 763 * If the _BCL package ordering is descending, the first level 764 * (br->levels[2]) is likely to be 0, and if the number of levels 765 * matches the number of steps, we might confuse a returned level to 766 * mean the index. 767 * 768 * For example: 769 * 770 * current_level = max_level = 100 771 * test_level = 0 772 * returned level = 100 773 * 774 * In this case 100 means the level, not the index, and _BCM failed. 775 * Still, if the _BCL package ordering is descending, the index of 776 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 777 * 778 * This causes all _BQC calls to return bogus values causing weird 779 * behavior from the user's perspective. For example: 780 * 781 * xbacklight -set 10; xbacklight -set 20; 782 * 783 * would flash to 90% and then slowly down to the desired level (20). 784 * 785 * The solution is simple; test anything other than the first level 786 * (e.g. 1). 787 */ 788 test_level = current_level == max_level 789 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 790 : max_level; 791 792 result = acpi_video_device_lcd_set_level(device, test_level); 793 if (result) 794 return result; 795 796 result = acpi_video_device_lcd_get_level_current(device, &level, true); 797 if (result) 798 return result; 799 800 if (level != test_level) { 801 /* buggy _BQC found, need to find out if it uses index */ 802 if (level < br->count) { 803 if (br->flags._BCL_reversed) 804 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 805 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 806 br->flags._BQC_use_index = 1; 807 } 808 809 if (!br->flags._BQC_use_index) 810 device->cap._BQC = device->cap._BCQ = 0; 811 } 812 813 return 0; 814 } 815 816 int acpi_video_get_levels(struct acpi_device *device, 817 struct acpi_video_device_brightness **dev_br, 818 int *pmax_level) 819 { 820 union acpi_object *obj = NULL; 821 int i, max_level = 0, count = 0, level_ac_battery = 0; 822 union acpi_object *o; 823 struct acpi_video_device_brightness *br = NULL; 824 int result = 0; 825 u32 value; 826 827 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 828 acpi_handle_debug(device->handle, 829 "Could not query available LCD brightness level\n"); 830 result = -ENODEV; 831 goto out; 832 } 833 834 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 835 result = -EINVAL; 836 goto out; 837 } 838 839 br = kzalloc(sizeof(*br), GFP_KERNEL); 840 if (!br) { 841 result = -ENOMEM; 842 goto out; 843 } 844 845 /* 846 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 847 * in order to account for buggy BIOS which don't export the first two 848 * special levels (see below) 849 */ 850 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 851 sizeof(*br->levels), 852 GFP_KERNEL); 853 if (!br->levels) { 854 result = -ENOMEM; 855 goto out_free; 856 } 857 858 for (i = 0; i < obj->package.count; i++) { 859 o = (union acpi_object *)&obj->package.elements[i]; 860 if (o->type != ACPI_TYPE_INTEGER) { 861 acpi_handle_info(device->handle, "Invalid data\n"); 862 continue; 863 } 864 value = (u32) o->integer.value; 865 /* Skip duplicate entries */ 866 if (count > ACPI_VIDEO_FIRST_LEVEL 867 && br->levels[count - 1] == value) 868 continue; 869 870 br->levels[count] = value; 871 872 if (br->levels[count] > max_level) 873 max_level = br->levels[count]; 874 count++; 875 } 876 877 /* 878 * some buggy BIOS don't export the levels 879 * when machine is on AC/Battery in _BCL package. 880 * In this case, the first two elements in _BCL packages 881 * are also supported brightness levels that OS should take care of. 882 */ 883 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 884 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 885 level_ac_battery++; 886 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 887 level_ac_battery++; 888 } 889 890 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 891 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 892 br->flags._BCL_no_ac_battery_levels = 1; 893 for (i = (count - 1 + level_ac_battery); 894 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 895 br->levels[i] = br->levels[i - level_ac_battery]; 896 count += level_ac_battery; 897 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 898 acpi_handle_info(device->handle, 899 "Too many duplicates in _BCL package"); 900 901 /* Check if the _BCL package is in a reversed order */ 902 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 903 br->flags._BCL_reversed = 1; 904 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 905 count - ACPI_VIDEO_FIRST_LEVEL, 906 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 907 acpi_video_cmp_level, NULL); 908 } else if (max_level != br->levels[count - 1]) 909 acpi_handle_info(device->handle, 910 "Found unordered _BCL package"); 911 912 br->count = count; 913 *dev_br = br; 914 if (pmax_level) 915 *pmax_level = max_level; 916 917 out: 918 kfree(obj); 919 return result; 920 out_free: 921 kfree(br); 922 goto out; 923 } 924 EXPORT_SYMBOL(acpi_video_get_levels); 925 926 /* 927 * Arg: 928 * device : video output device (LCD, CRT, ..) 929 * 930 * Return Value: 931 * Maximum brightness level 932 * 933 * Allocate and initialize device->brightness. 934 */ 935 936 static int 937 acpi_video_init_brightness(struct acpi_video_device *device) 938 { 939 int i, max_level = 0; 940 unsigned long long level, level_old; 941 struct acpi_video_device_brightness *br = NULL; 942 int result; 943 944 result = acpi_video_get_levels(device->dev, &br, &max_level); 945 if (result) 946 return result; 947 device->brightness = br; 948 949 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 950 br->curr = level = max_level; 951 952 if (!device->cap._BQC) 953 goto set_level; 954 955 result = acpi_video_device_lcd_get_level_current(device, 956 &level_old, true); 957 if (result) 958 goto out_free_levels; 959 960 result = acpi_video_bqc_quirk(device, max_level, level_old); 961 if (result) 962 goto out_free_levels; 963 /* 964 * cap._BQC may get cleared due to _BQC is found to be broken 965 * in acpi_video_bqc_quirk, so check again here. 966 */ 967 if (!device->cap._BQC) 968 goto set_level; 969 970 level = acpi_video_bqc_value_to_level(device, level_old); 971 /* 972 * On some buggy laptops, _BQC returns an uninitialized 973 * value when invoked for the first time, i.e. 974 * level_old is invalid (no matter whether it's a level 975 * or an index). Set the backlight to max_level in this case. 976 */ 977 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 978 if (level == br->levels[i]) 979 break; 980 if (i == br->count || !level) 981 level = max_level; 982 983 set_level: 984 result = acpi_video_device_lcd_set_level(device, level); 985 if (result) 986 goto out_free_levels; 987 988 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 989 br->count - ACPI_VIDEO_FIRST_LEVEL); 990 991 return 0; 992 993 out_free_levels: 994 kfree(br->levels); 995 kfree(br); 996 device->brightness = NULL; 997 return result; 998 } 999 1000 /* 1001 * Arg: 1002 * device : video output device (LCD, CRT, ..) 1003 * 1004 * Return Value: 1005 * None 1006 * 1007 * Find out all required AML methods defined under the output 1008 * device. 1009 */ 1010 1011 static void acpi_video_device_find_cap(struct acpi_video_device *device) 1012 { 1013 if (acpi_has_method(device->dev->handle, "_ADR")) 1014 device->cap._ADR = 1; 1015 if (acpi_has_method(device->dev->handle, "_BCL")) 1016 device->cap._BCL = 1; 1017 if (acpi_has_method(device->dev->handle, "_BCM")) 1018 device->cap._BCM = 1; 1019 if (acpi_has_method(device->dev->handle, "_BQC")) { 1020 device->cap._BQC = 1; 1021 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 1022 acpi_handle_info(device->dev->handle, 1023 "_BCQ is used instead of _BQC\n"); 1024 device->cap._BCQ = 1; 1025 } 1026 1027 if (acpi_has_method(device->dev->handle, "_DDC")) 1028 device->cap._DDC = 1; 1029 } 1030 1031 /* 1032 * Arg: 1033 * device : video output device (VGA) 1034 * 1035 * Return Value: 1036 * None 1037 * 1038 * Find out all required AML methods defined under the video bus device. 1039 */ 1040 1041 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1042 { 1043 if (acpi_has_method(video->device->handle, "_DOS")) 1044 video->cap._DOS = 1; 1045 if (acpi_has_method(video->device->handle, "_DOD")) 1046 video->cap._DOD = 1; 1047 if (acpi_has_method(video->device->handle, "_ROM")) 1048 video->cap._ROM = 1; 1049 if (acpi_has_method(video->device->handle, "_GPD")) 1050 video->cap._GPD = 1; 1051 if (acpi_has_method(video->device->handle, "_SPD")) 1052 video->cap._SPD = 1; 1053 if (acpi_has_method(video->device->handle, "_VPO")) 1054 video->cap._VPO = 1; 1055 } 1056 1057 /* 1058 * Check whether the video bus device has required AML method to 1059 * support the desired features 1060 */ 1061 1062 static int acpi_video_bus_check(struct acpi_video_bus *video) 1063 { 1064 acpi_status status = -ENOENT; 1065 struct pci_dev *dev; 1066 1067 if (!video) 1068 return -EINVAL; 1069 1070 dev = acpi_get_pci_dev(video->device->handle); 1071 if (!dev) 1072 return -ENODEV; 1073 pci_dev_put(dev); 1074 1075 /* 1076 * Since there is no HID, CID and so on for VGA driver, we have 1077 * to check well known required nodes. 1078 */ 1079 1080 /* Does this device support video switching? */ 1081 if (video->cap._DOS || video->cap._DOD) { 1082 if (!video->cap._DOS) { 1083 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1084 acpi_device_bid(video->device)); 1085 } 1086 video->flags.multihead = 1; 1087 status = 0; 1088 } 1089 1090 /* Does this device support retrieving a video ROM? */ 1091 if (video->cap._ROM) { 1092 video->flags.rom = 1; 1093 status = 0; 1094 } 1095 1096 /* Does this device support configuring which video device to POST? */ 1097 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1098 video->flags.post = 1; 1099 status = 0; 1100 } 1101 1102 return status; 1103 } 1104 1105 /* 1106 * -------------------------------------------------------------------------- 1107 * Driver Interface 1108 * -------------------------------------------------------------------------- 1109 */ 1110 1111 /* device interface */ 1112 static struct acpi_video_device_attrib * 1113 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1114 { 1115 struct acpi_video_enumerated_device *ids; 1116 int i; 1117 1118 for (i = 0; i < video->attached_count; i++) { 1119 ids = &video->attached_array[i]; 1120 if ((ids->value.int_val & 0xffff) == device_id) 1121 return &ids->value.attrib; 1122 } 1123 1124 return NULL; 1125 } 1126 1127 static int 1128 acpi_video_get_device_type(struct acpi_video_bus *video, 1129 unsigned long device_id) 1130 { 1131 struct acpi_video_enumerated_device *ids; 1132 int i; 1133 1134 for (i = 0; i < video->attached_count; i++) { 1135 ids = &video->attached_array[i]; 1136 if ((ids->value.int_val & 0xffff) == device_id) 1137 return ids->value.int_val; 1138 } 1139 1140 return 0; 1141 } 1142 1143 static int 1144 acpi_video_bus_get_one_device(struct acpi_device *device, 1145 struct acpi_video_bus *video) 1146 { 1147 unsigned long long device_id; 1148 int status, device_type; 1149 struct acpi_video_device *data; 1150 struct acpi_video_device_attrib *attribute; 1151 1152 status = 1153 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1154 /* Some device omits _ADR, we skip them instead of fail */ 1155 if (ACPI_FAILURE(status)) 1156 return 0; 1157 1158 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1159 if (!data) 1160 return -ENOMEM; 1161 1162 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1163 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1164 device->driver_data = data; 1165 1166 data->device_id = device_id; 1167 data->video = video; 1168 data->dev = device; 1169 INIT_DELAYED_WORK(&data->switch_brightness_work, 1170 acpi_video_switch_brightness); 1171 1172 attribute = acpi_video_get_device_attr(video, device_id); 1173 1174 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1175 switch (attribute->display_type) { 1176 case ACPI_VIDEO_DISPLAY_CRT: 1177 data->flags.crt = 1; 1178 break; 1179 case ACPI_VIDEO_DISPLAY_TV: 1180 data->flags.tvout = 1; 1181 break; 1182 case ACPI_VIDEO_DISPLAY_DVI: 1183 data->flags.dvi = 1; 1184 break; 1185 case ACPI_VIDEO_DISPLAY_LCD: 1186 data->flags.lcd = 1; 1187 break; 1188 default: 1189 data->flags.unknown = 1; 1190 break; 1191 } 1192 if (attribute->bios_can_detect) 1193 data->flags.bios = 1; 1194 } else { 1195 /* Check for legacy IDs */ 1196 device_type = acpi_video_get_device_type(video, device_id); 1197 /* Ignore bits 16 and 18-20 */ 1198 switch (device_type & 0xffe2ffff) { 1199 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1200 data->flags.crt = 1; 1201 break; 1202 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1203 data->flags.lcd = 1; 1204 break; 1205 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1206 data->flags.tvout = 1; 1207 break; 1208 default: 1209 data->flags.unknown = 1; 1210 } 1211 } 1212 1213 acpi_video_device_bind(video, data); 1214 acpi_video_device_find_cap(data); 1215 1216 mutex_lock(&video->device_list_lock); 1217 list_add_tail(&data->entry, &video->video_device_list); 1218 mutex_unlock(&video->device_list_lock); 1219 1220 return status; 1221 } 1222 1223 /* 1224 * Arg: 1225 * video : video bus device 1226 * 1227 * Return: 1228 * none 1229 * 1230 * Enumerate the video device list of the video bus, 1231 * bind the ids with the corresponding video devices 1232 * under the video bus. 1233 */ 1234 1235 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1236 { 1237 struct acpi_video_device *dev; 1238 1239 mutex_lock(&video->device_list_lock); 1240 1241 list_for_each_entry(dev, &video->video_device_list, entry) 1242 acpi_video_device_bind(video, dev); 1243 1244 mutex_unlock(&video->device_list_lock); 1245 } 1246 1247 /* 1248 * Arg: 1249 * video : video bus device 1250 * device : video output device under the video 1251 * bus 1252 * 1253 * Return: 1254 * none 1255 * 1256 * Bind the ids with the corresponding video devices 1257 * under the video bus. 1258 */ 1259 1260 static void 1261 acpi_video_device_bind(struct acpi_video_bus *video, 1262 struct acpi_video_device *device) 1263 { 1264 struct acpi_video_enumerated_device *ids; 1265 int i; 1266 1267 for (i = 0; i < video->attached_count; i++) { 1268 ids = &video->attached_array[i]; 1269 if (device->device_id == (ids->value.int_val & 0xffff)) { 1270 ids->bind_info = device; 1271 acpi_handle_debug(video->device->handle, "%s: %d\n", 1272 __func__, i); 1273 } 1274 } 1275 } 1276 1277 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1278 { 1279 struct acpi_video_bus *video = device->video; 1280 int i; 1281 1282 /* 1283 * If we have a broken _DOD or we have more than 8 output devices 1284 * under the graphics controller node that we can't proper deal with 1285 * in the operation region code currently, no need to test. 1286 */ 1287 if (!video->attached_count || video->child_count > 8) 1288 return true; 1289 1290 for (i = 0; i < video->attached_count; i++) { 1291 if ((video->attached_array[i].value.int_val & 0xfff) == 1292 (device->device_id & 0xfff)) 1293 return true; 1294 } 1295 1296 return false; 1297 } 1298 1299 /* 1300 * Arg: 1301 * video : video bus device 1302 * 1303 * Return: 1304 * < 0 : error 1305 * 1306 * Call _DOD to enumerate all devices attached to display adapter 1307 * 1308 */ 1309 1310 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1311 { 1312 int status; 1313 int count; 1314 int i; 1315 struct acpi_video_enumerated_device *active_list; 1316 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1317 union acpi_object *dod = NULL; 1318 union acpi_object *obj; 1319 1320 if (!video->cap._DOD) 1321 return AE_NOT_EXIST; 1322 1323 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1324 if (ACPI_FAILURE(status)) { 1325 acpi_handle_info(video->device->handle, 1326 "_DOD evaluation failed: %s\n", 1327 acpi_format_exception(status)); 1328 return status; 1329 } 1330 1331 dod = buffer.pointer; 1332 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1333 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1334 status = -EFAULT; 1335 goto out; 1336 } 1337 1338 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1339 dod->package.count); 1340 1341 active_list = kcalloc(1 + dod->package.count, 1342 sizeof(struct acpi_video_enumerated_device), 1343 GFP_KERNEL); 1344 if (!active_list) { 1345 status = -ENOMEM; 1346 goto out; 1347 } 1348 1349 count = 0; 1350 for (i = 0; i < dod->package.count; i++) { 1351 obj = &dod->package.elements[i]; 1352 1353 if (obj->type != ACPI_TYPE_INTEGER) { 1354 acpi_handle_info(video->device->handle, 1355 "Invalid _DOD data in element %d\n", i); 1356 continue; 1357 } 1358 1359 active_list[count].value.int_val = obj->integer.value; 1360 active_list[count].bind_info = NULL; 1361 1362 acpi_handle_debug(video->device->handle, 1363 "_DOD element[%d] = %d\n", i, 1364 (int)obj->integer.value); 1365 1366 count++; 1367 } 1368 1369 kfree(video->attached_array); 1370 1371 video->attached_array = active_list; 1372 video->attached_count = count; 1373 1374 out: 1375 kfree(buffer.pointer); 1376 return status; 1377 } 1378 1379 static int 1380 acpi_video_get_next_level(struct acpi_video_device *device, 1381 u32 level_current, u32 event) 1382 { 1383 int min, max, min_above, max_below, i, l, delta = 255; 1384 max = max_below = 0; 1385 min = min_above = 255; 1386 /* Find closest level to level_current */ 1387 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1388 l = device->brightness->levels[i]; 1389 if (abs(l - level_current) < abs(delta)) { 1390 delta = l - level_current; 1391 if (!delta) 1392 break; 1393 } 1394 } 1395 /* Adjust level_current to closest available level */ 1396 level_current += delta; 1397 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1398 l = device->brightness->levels[i]; 1399 if (l < min) 1400 min = l; 1401 if (l > max) 1402 max = l; 1403 if (l < min_above && l > level_current) 1404 min_above = l; 1405 if (l > max_below && l < level_current) 1406 max_below = l; 1407 } 1408 1409 switch (event) { 1410 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1411 return (level_current < max) ? min_above : min; 1412 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1413 return (level_current < max) ? min_above : max; 1414 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1415 return (level_current > min) ? max_below : min; 1416 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1417 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1418 return 0; 1419 default: 1420 return level_current; 1421 } 1422 } 1423 1424 static void 1425 acpi_video_switch_brightness(struct work_struct *work) 1426 { 1427 struct acpi_video_device *device = container_of(to_delayed_work(work), 1428 struct acpi_video_device, switch_brightness_work); 1429 unsigned long long level_current, level_next; 1430 int event = device->switch_brightness_event; 1431 int result = -EINVAL; 1432 1433 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1434 if (!device->backlight) 1435 return; 1436 1437 if (!device->brightness) 1438 goto out; 1439 1440 result = acpi_video_device_lcd_get_level_current(device, 1441 &level_current, 1442 false); 1443 if (result) 1444 goto out; 1445 1446 level_next = acpi_video_get_next_level(device, level_current, event); 1447 1448 result = acpi_video_device_lcd_set_level(device, level_next); 1449 1450 if (!result) 1451 backlight_force_update(device->backlight, 1452 BACKLIGHT_UPDATE_HOTKEY); 1453 1454 out: 1455 if (result) 1456 acpi_handle_info(device->dev->handle, 1457 "Failed to switch brightness\n"); 1458 } 1459 1460 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1461 void **edid) 1462 { 1463 struct acpi_video_bus *video; 1464 struct acpi_video_device *video_device; 1465 union acpi_object *buffer = NULL; 1466 acpi_status status; 1467 int i, length; 1468 1469 if (!device || !acpi_driver_data(device)) 1470 return -EINVAL; 1471 1472 video = acpi_driver_data(device); 1473 1474 for (i = 0; i < video->attached_count; i++) { 1475 video_device = video->attached_array[i].bind_info; 1476 length = 256; 1477 1478 if (!video_device) 1479 continue; 1480 1481 if (!video_device->cap._DDC) 1482 continue; 1483 1484 if (type) { 1485 switch (type) { 1486 case ACPI_VIDEO_DISPLAY_CRT: 1487 if (!video_device->flags.crt) 1488 continue; 1489 break; 1490 case ACPI_VIDEO_DISPLAY_TV: 1491 if (!video_device->flags.tvout) 1492 continue; 1493 break; 1494 case ACPI_VIDEO_DISPLAY_DVI: 1495 if (!video_device->flags.dvi) 1496 continue; 1497 break; 1498 case ACPI_VIDEO_DISPLAY_LCD: 1499 if (!video_device->flags.lcd) 1500 continue; 1501 break; 1502 } 1503 } else if (video_device->device_id != device_id) { 1504 continue; 1505 } 1506 1507 status = acpi_video_device_EDID(video_device, &buffer, length); 1508 1509 if (ACPI_FAILURE(status) || !buffer || 1510 buffer->type != ACPI_TYPE_BUFFER) { 1511 length = 128; 1512 status = acpi_video_device_EDID(video_device, &buffer, 1513 length); 1514 if (ACPI_FAILURE(status) || !buffer || 1515 buffer->type != ACPI_TYPE_BUFFER) { 1516 continue; 1517 } 1518 } 1519 1520 *edid = buffer->buffer.pointer; 1521 return length; 1522 } 1523 1524 return -ENODEV; 1525 } 1526 EXPORT_SYMBOL(acpi_video_get_edid); 1527 1528 static int 1529 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1530 struct acpi_device *device) 1531 { 1532 int status = 0; 1533 struct acpi_device *dev; 1534 1535 /* 1536 * There are systems where video module known to work fine regardless 1537 * of broken _DOD and ignoring returned value here doesn't cause 1538 * any issues later. 1539 */ 1540 acpi_video_device_enumerate(video); 1541 1542 list_for_each_entry(dev, &device->children, node) { 1543 1544 status = acpi_video_bus_get_one_device(dev, video); 1545 if (status) { 1546 dev_err(&dev->dev, "Can't attach device\n"); 1547 break; 1548 } 1549 video->child_count++; 1550 } 1551 return status; 1552 } 1553 1554 /* acpi_video interface */ 1555 1556 /* 1557 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1558 * perform any automatic brightness change on receiving a notification. 1559 */ 1560 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1561 { 1562 return acpi_video_bus_DOS(video, 0, 1563 acpi_osi_is_win8() ? 1 : 0); 1564 } 1565 1566 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1567 { 1568 return acpi_video_bus_DOS(video, 0, 1569 acpi_osi_is_win8() ? 0 : 1); 1570 } 1571 1572 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1573 { 1574 struct acpi_video_bus *video = acpi_driver_data(device); 1575 struct input_dev *input; 1576 int keycode = 0; 1577 1578 if (!video || !video->input) 1579 return; 1580 1581 input = video->input; 1582 1583 switch (event) { 1584 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1585 * most likely via hotkey. */ 1586 keycode = KEY_SWITCHVIDEOMODE; 1587 break; 1588 1589 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1590 * connector. */ 1591 acpi_video_device_enumerate(video); 1592 acpi_video_device_rebind(video); 1593 keycode = KEY_SWITCHVIDEOMODE; 1594 break; 1595 1596 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1597 keycode = KEY_SWITCHVIDEOMODE; 1598 break; 1599 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1600 keycode = KEY_VIDEO_NEXT; 1601 break; 1602 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1603 keycode = KEY_VIDEO_PREV; 1604 break; 1605 1606 default: 1607 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1608 event); 1609 break; 1610 } 1611 1612 if (acpi_notifier_call_chain(device, event, 0)) 1613 /* Something vetoed the keypress. */ 1614 keycode = 0; 1615 1616 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1617 input_report_key(input, keycode, 1); 1618 input_sync(input); 1619 input_report_key(input, keycode, 0); 1620 input_sync(input); 1621 } 1622 } 1623 1624 static void brightness_switch_event(struct acpi_video_device *video_device, 1625 u32 event) 1626 { 1627 if (!brightness_switch_enabled) 1628 return; 1629 1630 video_device->switch_brightness_event = event; 1631 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1632 } 1633 1634 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1635 { 1636 struct acpi_video_device *video_device = data; 1637 struct acpi_device *device = NULL; 1638 struct acpi_video_bus *bus; 1639 struct input_dev *input; 1640 int keycode = 0; 1641 1642 if (!video_device) 1643 return; 1644 1645 device = video_device->dev; 1646 bus = video_device->video; 1647 input = bus->input; 1648 1649 if (hw_changes_brightness > 0) { 1650 if (video_device->backlight) 1651 backlight_force_update(video_device->backlight, 1652 BACKLIGHT_UPDATE_HOTKEY); 1653 acpi_notifier_call_chain(device, event, 0); 1654 return; 1655 } 1656 1657 switch (event) { 1658 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1659 brightness_switch_event(video_device, event); 1660 keycode = KEY_BRIGHTNESS_CYCLE; 1661 break; 1662 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1663 brightness_switch_event(video_device, event); 1664 keycode = KEY_BRIGHTNESSUP; 1665 break; 1666 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1667 brightness_switch_event(video_device, event); 1668 keycode = KEY_BRIGHTNESSDOWN; 1669 break; 1670 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1671 brightness_switch_event(video_device, event); 1672 keycode = KEY_BRIGHTNESS_ZERO; 1673 break; 1674 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1675 brightness_switch_event(video_device, event); 1676 keycode = KEY_DISPLAY_OFF; 1677 break; 1678 default: 1679 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1680 break; 1681 } 1682 1683 acpi_notifier_call_chain(device, event, 0); 1684 1685 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1686 input_report_key(input, keycode, 1); 1687 input_sync(input); 1688 input_report_key(input, keycode, 0); 1689 input_sync(input); 1690 } 1691 } 1692 1693 static int acpi_video_resume(struct notifier_block *nb, 1694 unsigned long val, void *ign) 1695 { 1696 struct acpi_video_bus *video; 1697 struct acpi_video_device *video_device; 1698 int i; 1699 1700 switch (val) { 1701 case PM_HIBERNATION_PREPARE: 1702 case PM_SUSPEND_PREPARE: 1703 case PM_RESTORE_PREPARE: 1704 return NOTIFY_DONE; 1705 } 1706 1707 video = container_of(nb, struct acpi_video_bus, pm_nb); 1708 1709 dev_info(&video->device->dev, "Restoring backlight state\n"); 1710 1711 for (i = 0; i < video->attached_count; i++) { 1712 video_device = video->attached_array[i].bind_info; 1713 if (video_device && video_device->brightness) 1714 acpi_video_device_lcd_set_level(video_device, 1715 video_device->brightness->curr); 1716 } 1717 1718 return NOTIFY_OK; 1719 } 1720 1721 static acpi_status 1722 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1723 void **return_value) 1724 { 1725 struct acpi_device *device = context; 1726 struct acpi_device *sibling; 1727 int result; 1728 1729 if (handle == device->handle) 1730 return AE_CTRL_TERMINATE; 1731 1732 result = acpi_bus_get_device(handle, &sibling); 1733 if (result) 1734 return AE_OK; 1735 1736 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1737 return AE_ALREADY_EXISTS; 1738 1739 return AE_OK; 1740 } 1741 1742 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1743 { 1744 struct backlight_properties props; 1745 struct pci_dev *pdev; 1746 acpi_handle acpi_parent; 1747 struct device *parent = NULL; 1748 int result; 1749 static int count; 1750 char *name; 1751 1752 result = acpi_video_init_brightness(device); 1753 if (result) 1754 return; 1755 1756 if (disable_backlight_sysfs_if > 0) 1757 return; 1758 1759 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1760 if (!name) 1761 return; 1762 count++; 1763 1764 acpi_get_parent(device->dev->handle, &acpi_parent); 1765 1766 pdev = acpi_get_pci_dev(acpi_parent); 1767 if (pdev) { 1768 parent = &pdev->dev; 1769 pci_dev_put(pdev); 1770 } 1771 1772 memset(&props, 0, sizeof(struct backlight_properties)); 1773 props.type = BACKLIGHT_FIRMWARE; 1774 props.max_brightness = 1775 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1776 device->backlight = backlight_device_register(name, 1777 parent, 1778 device, 1779 &acpi_backlight_ops, 1780 &props); 1781 kfree(name); 1782 if (IS_ERR(device->backlight)) { 1783 device->backlight = NULL; 1784 return; 1785 } 1786 1787 /* 1788 * Save current brightness level in case we have to restore it 1789 * before acpi_video_device_lcd_set_level() is called next time. 1790 */ 1791 device->backlight->props.brightness = 1792 acpi_video_get_brightness(device->backlight); 1793 1794 device->cooling_dev = thermal_cooling_device_register("LCD", 1795 device->dev, &video_cooling_ops); 1796 if (IS_ERR(device->cooling_dev)) { 1797 /* 1798 * Set cooling_dev to NULL so we don't crash trying to free it. 1799 * Also, why the hell we are returning early and not attempt to 1800 * register video output if cooling device registration failed? 1801 * -- dtor 1802 */ 1803 device->cooling_dev = NULL; 1804 return; 1805 } 1806 1807 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1808 device->cooling_dev->id); 1809 result = sysfs_create_link(&device->dev->dev.kobj, 1810 &device->cooling_dev->device.kobj, 1811 "thermal_cooling"); 1812 if (result) 1813 pr_info("sysfs link creation failed\n"); 1814 1815 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1816 &device->dev->dev.kobj, "device"); 1817 if (result) 1818 pr_info("Reverse sysfs link creation failed\n"); 1819 } 1820 1821 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1822 { 1823 struct acpi_video_device *dev; 1824 union acpi_object *levels; 1825 1826 mutex_lock(&video->device_list_lock); 1827 list_for_each_entry(dev, &video->video_device_list, entry) { 1828 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1829 kfree(levels); 1830 } 1831 mutex_unlock(&video->device_list_lock); 1832 } 1833 1834 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1835 { 1836 /* 1837 * Do not create backlight device for video output 1838 * device that is not in the enumerated list. 1839 */ 1840 if (!acpi_video_device_in_dod(dev)) { 1841 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1842 return false; 1843 } 1844 1845 if (only_lcd) 1846 return dev->flags.lcd; 1847 return true; 1848 } 1849 1850 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1851 { 1852 struct acpi_video_device *dev; 1853 1854 if (video->backlight_registered) 1855 return 0; 1856 1857 acpi_video_run_bcl_for_osi(video); 1858 1859 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1860 return 0; 1861 1862 mutex_lock(&video->device_list_lock); 1863 list_for_each_entry(dev, &video->video_device_list, entry) { 1864 if (acpi_video_should_register_backlight(dev)) 1865 acpi_video_dev_register_backlight(dev); 1866 } 1867 mutex_unlock(&video->device_list_lock); 1868 1869 video->backlight_registered = true; 1870 1871 video->pm_nb.notifier_call = acpi_video_resume; 1872 video->pm_nb.priority = 0; 1873 return register_pm_notifier(&video->pm_nb); 1874 } 1875 1876 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1877 { 1878 if (device->backlight) { 1879 backlight_device_unregister(device->backlight); 1880 device->backlight = NULL; 1881 } 1882 if (device->brightness) { 1883 kfree(device->brightness->levels); 1884 kfree(device->brightness); 1885 device->brightness = NULL; 1886 } 1887 if (device->cooling_dev) { 1888 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1889 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1890 thermal_cooling_device_unregister(device->cooling_dev); 1891 device->cooling_dev = NULL; 1892 } 1893 } 1894 1895 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1896 { 1897 struct acpi_video_device *dev; 1898 int error; 1899 1900 if (!video->backlight_registered) 1901 return 0; 1902 1903 error = unregister_pm_notifier(&video->pm_nb); 1904 1905 mutex_lock(&video->device_list_lock); 1906 list_for_each_entry(dev, &video->video_device_list, entry) 1907 acpi_video_dev_unregister_backlight(dev); 1908 mutex_unlock(&video->device_list_lock); 1909 1910 video->backlight_registered = false; 1911 1912 return error; 1913 } 1914 1915 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1916 { 1917 acpi_status status; 1918 struct acpi_device *adev = device->dev; 1919 1920 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1921 acpi_video_device_notify, device); 1922 if (ACPI_FAILURE(status)) 1923 dev_err(&adev->dev, "Error installing notify handler\n"); 1924 else 1925 device->flags.notify = 1; 1926 } 1927 1928 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1929 { 1930 struct input_dev *input; 1931 struct acpi_video_device *dev; 1932 int error; 1933 1934 video->input = input = input_allocate_device(); 1935 if (!input) { 1936 error = -ENOMEM; 1937 goto out; 1938 } 1939 1940 error = acpi_video_bus_start_devices(video); 1941 if (error) 1942 goto err_free_input; 1943 1944 snprintf(video->phys, sizeof(video->phys), 1945 "%s/video/input0", acpi_device_hid(video->device)); 1946 1947 input->name = acpi_device_name(video->device); 1948 input->phys = video->phys; 1949 input->id.bustype = BUS_HOST; 1950 input->id.product = 0x06; 1951 input->dev.parent = &video->device->dev; 1952 input->evbit[0] = BIT(EV_KEY); 1953 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1954 set_bit(KEY_VIDEO_NEXT, input->keybit); 1955 set_bit(KEY_VIDEO_PREV, input->keybit); 1956 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1957 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1958 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1959 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1960 set_bit(KEY_DISPLAY_OFF, input->keybit); 1961 1962 error = input_register_device(input); 1963 if (error) 1964 goto err_stop_dev; 1965 1966 mutex_lock(&video->device_list_lock); 1967 list_for_each_entry(dev, &video->video_device_list, entry) 1968 acpi_video_dev_add_notify_handler(dev); 1969 mutex_unlock(&video->device_list_lock); 1970 1971 return 0; 1972 1973 err_stop_dev: 1974 acpi_video_bus_stop_devices(video); 1975 err_free_input: 1976 input_free_device(input); 1977 video->input = NULL; 1978 out: 1979 return error; 1980 } 1981 1982 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1983 { 1984 if (dev->flags.notify) { 1985 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1986 acpi_video_device_notify); 1987 dev->flags.notify = 0; 1988 } 1989 } 1990 1991 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1992 { 1993 struct acpi_video_device *dev; 1994 1995 mutex_lock(&video->device_list_lock); 1996 list_for_each_entry(dev, &video->video_device_list, entry) 1997 acpi_video_dev_remove_notify_handler(dev); 1998 mutex_unlock(&video->device_list_lock); 1999 2000 acpi_video_bus_stop_devices(video); 2001 input_unregister_device(video->input); 2002 video->input = NULL; 2003 } 2004 2005 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 2006 { 2007 struct acpi_video_device *dev, *next; 2008 2009 mutex_lock(&video->device_list_lock); 2010 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 2011 list_del(&dev->entry); 2012 kfree(dev); 2013 } 2014 mutex_unlock(&video->device_list_lock); 2015 2016 return 0; 2017 } 2018 2019 static int instance; 2020 2021 static int acpi_video_bus_add(struct acpi_device *device) 2022 { 2023 struct acpi_video_bus *video; 2024 int error; 2025 acpi_status status; 2026 2027 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 2028 device->parent->handle, 1, 2029 acpi_video_bus_match, NULL, 2030 device, NULL); 2031 if (status == AE_ALREADY_EXISTS) { 2032 pr_info(FW_BUG 2033 "Duplicate ACPI video bus devices for the" 2034 " same VGA controller, please try module " 2035 "parameter \"video.allow_duplicates=1\"" 2036 "if the current driver doesn't work.\n"); 2037 if (!allow_duplicates) 2038 return -ENODEV; 2039 } 2040 2041 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2042 if (!video) 2043 return -ENOMEM; 2044 2045 /* a hack to fix the duplicate name "VID" problem on T61 */ 2046 if (!strcmp(device->pnp.bus_id, "VID")) { 2047 if (instance) 2048 device->pnp.bus_id[3] = '0' + instance; 2049 instance++; 2050 } 2051 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2052 if (!strcmp(device->pnp.bus_id, "VGA")) { 2053 if (instance) 2054 device->pnp.bus_id[3] = '0' + instance; 2055 instance++; 2056 } 2057 2058 video->device = device; 2059 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2060 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2061 device->driver_data = video; 2062 2063 acpi_video_bus_find_cap(video); 2064 error = acpi_video_bus_check(video); 2065 if (error) 2066 goto err_free_video; 2067 2068 mutex_init(&video->device_list_lock); 2069 INIT_LIST_HEAD(&video->video_device_list); 2070 2071 error = acpi_video_bus_get_devices(video, device); 2072 if (error) 2073 goto err_put_video; 2074 2075 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2076 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2077 video->flags.multihead ? "yes" : "no", 2078 video->flags.rom ? "yes" : "no", 2079 video->flags.post ? "yes" : "no"); 2080 mutex_lock(&video_list_lock); 2081 list_add_tail(&video->entry, &video_bus_head); 2082 mutex_unlock(&video_list_lock); 2083 2084 acpi_video_bus_register_backlight(video); 2085 acpi_video_bus_add_notify_handler(video); 2086 2087 return 0; 2088 2089 err_put_video: 2090 acpi_video_bus_put_devices(video); 2091 kfree(video->attached_array); 2092 err_free_video: 2093 kfree(video); 2094 device->driver_data = NULL; 2095 2096 return error; 2097 } 2098 2099 static int acpi_video_bus_remove(struct acpi_device *device) 2100 { 2101 struct acpi_video_bus *video = NULL; 2102 2103 2104 if (!device || !acpi_driver_data(device)) 2105 return -EINVAL; 2106 2107 video = acpi_driver_data(device); 2108 2109 acpi_video_bus_remove_notify_handler(video); 2110 acpi_video_bus_unregister_backlight(video); 2111 acpi_video_bus_put_devices(video); 2112 2113 mutex_lock(&video_list_lock); 2114 list_del(&video->entry); 2115 mutex_unlock(&video_list_lock); 2116 2117 kfree(video->attached_array); 2118 kfree(video); 2119 2120 return 0; 2121 } 2122 2123 static int __init is_i740(struct pci_dev *dev) 2124 { 2125 if (dev->device == 0x00D1) 2126 return 1; 2127 if (dev->device == 0x7000) 2128 return 1; 2129 return 0; 2130 } 2131 2132 static int __init intel_opregion_present(void) 2133 { 2134 int opregion = 0; 2135 struct pci_dev *dev = NULL; 2136 u32 address; 2137 2138 for_each_pci_dev(dev) { 2139 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2140 continue; 2141 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2142 continue; 2143 /* We don't want to poke around undefined i740 registers */ 2144 if (is_i740(dev)) 2145 continue; 2146 pci_read_config_dword(dev, 0xfc, &address); 2147 if (!address) 2148 continue; 2149 opregion = 1; 2150 } 2151 return opregion; 2152 } 2153 2154 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2155 static bool dmi_is_desktop(void) 2156 { 2157 const char *chassis_type; 2158 unsigned long type; 2159 2160 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2161 if (!chassis_type) 2162 return false; 2163 2164 if (kstrtoul(chassis_type, 10, &type) != 0) 2165 return false; 2166 2167 switch (type) { 2168 case 0x03: /* Desktop */ 2169 case 0x04: /* Low Profile Desktop */ 2170 case 0x05: /* Pizza Box */ 2171 case 0x06: /* Mini Tower */ 2172 case 0x07: /* Tower */ 2173 case 0x10: /* Lunch Box */ 2174 case 0x11: /* Main Server Chassis */ 2175 return true; 2176 } 2177 2178 return false; 2179 } 2180 2181 /* 2182 * We're seeing a lot of bogus backlight interfaces on newer machines 2183 * without a LCD such as desktops, servers and HDMI sticks. Checking the 2184 * lcd flag fixes this, enable this by default on any machines which are: 2185 * 1. Win8 ready (where we also prefer the native backlight driver, so 2186 * normally the acpi_video code should not register there anyways); *and* 2187 * 2.1 Report a desktop/server DMI chassis-type, or 2188 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for 2189 backlight control) 2190 */ 2191 static bool should_check_lcd_flag(void) 2192 { 2193 if (!acpi_osi_is_win8()) 2194 return false; 2195 2196 if (dmi_is_desktop()) 2197 return true; 2198 2199 if (acpi_reduced_hardware()) 2200 return true; 2201 2202 return false; 2203 } 2204 2205 int acpi_video_register(void) 2206 { 2207 int ret = 0; 2208 2209 mutex_lock(®ister_count_mutex); 2210 if (register_count) { 2211 /* 2212 * if the function of acpi_video_register is already called, 2213 * don't register the acpi_video_bus again and return no error. 2214 */ 2215 goto leave; 2216 } 2217 2218 if (only_lcd == -1) 2219 only_lcd = should_check_lcd_flag(); 2220 2221 dmi_check_system(video_dmi_table); 2222 2223 ret = acpi_bus_register_driver(&acpi_video_bus); 2224 if (ret) 2225 goto leave; 2226 2227 /* 2228 * When the acpi_video_bus is loaded successfully, increase 2229 * the counter reference. 2230 */ 2231 register_count = 1; 2232 2233 leave: 2234 mutex_unlock(®ister_count_mutex); 2235 return ret; 2236 } 2237 EXPORT_SYMBOL(acpi_video_register); 2238 2239 void acpi_video_unregister(void) 2240 { 2241 mutex_lock(®ister_count_mutex); 2242 if (register_count) { 2243 acpi_bus_unregister_driver(&acpi_video_bus); 2244 register_count = 0; 2245 } 2246 mutex_unlock(®ister_count_mutex); 2247 } 2248 EXPORT_SYMBOL(acpi_video_unregister); 2249 2250 void acpi_video_unregister_backlight(void) 2251 { 2252 struct acpi_video_bus *video; 2253 2254 mutex_lock(®ister_count_mutex); 2255 if (register_count) { 2256 mutex_lock(&video_list_lock); 2257 list_for_each_entry(video, &video_bus_head, entry) 2258 acpi_video_bus_unregister_backlight(video); 2259 mutex_unlock(&video_list_lock); 2260 } 2261 mutex_unlock(®ister_count_mutex); 2262 } 2263 2264 bool acpi_video_handles_brightness_key_presses(void) 2265 { 2266 bool have_video_busses; 2267 2268 mutex_lock(&video_list_lock); 2269 have_video_busses = !list_empty(&video_bus_head); 2270 mutex_unlock(&video_list_lock); 2271 2272 return have_video_busses && 2273 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2274 } 2275 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2276 2277 /* 2278 * This is kind of nasty. Hardware using Intel chipsets may require 2279 * the video opregion code to be run first in order to initialise 2280 * state before any ACPI video calls are made. To handle this we defer 2281 * registration of the video class until the opregion code has run. 2282 */ 2283 2284 static int __init acpi_video_init(void) 2285 { 2286 /* 2287 * Let the module load even if ACPI is disabled (e.g. due to 2288 * a broken BIOS) so that i915.ko can still be loaded on such 2289 * old systems without an AcpiOpRegion. 2290 * 2291 * acpi_video_register() will report -ENODEV later as well due 2292 * to acpi_disabled when i915.ko tries to register itself afterwards. 2293 */ 2294 if (acpi_disabled) 2295 return 0; 2296 2297 if (intel_opregion_present()) 2298 return 0; 2299 2300 return acpi_video_register(); 2301 } 2302 2303 static void __exit acpi_video_exit(void) 2304 { 2305 acpi_video_detect_exit(); 2306 acpi_video_unregister(); 2307 } 2308 2309 module_init(acpi_video_init); 2310 module_exit(acpi_video_exit); 2311