1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * video.c - ACPI Video Driver 4 * 5 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> 6 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org> 7 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/types.h> 14 #include <linux/list.h> 15 #include <linux/mutex.h> 16 #include <linux/input.h> 17 #include <linux/backlight.h> 18 #include <linux/thermal.h> 19 #include <linux/sort.h> 20 #include <linux/pci.h> 21 #include <linux/pci_ids.h> 22 #include <linux/slab.h> 23 #include <linux/dmi.h> 24 #include <linux/suspend.h> 25 #include <linux/acpi.h> 26 #include <acpi/video.h> 27 #include <linux/uaccess.h> 28 29 #define PREFIX "ACPI: " 30 31 #define ACPI_VIDEO_BUS_NAME "Video Bus" 32 #define ACPI_VIDEO_DEVICE_NAME "Video Device" 33 34 #define MAX_NAME_LEN 20 35 36 #define _COMPONENT ACPI_VIDEO_COMPONENT 37 ACPI_MODULE_NAME("video"); 38 39 MODULE_AUTHOR("Bruno Ducrot"); 40 MODULE_DESCRIPTION("ACPI Video Driver"); 41 MODULE_LICENSE("GPL"); 42 43 static bool brightness_switch_enabled = true; 44 module_param(brightness_switch_enabled, bool, 0644); 45 46 /* 47 * By default, we don't allow duplicate ACPI video bus devices 48 * under the same VGA controller 49 */ 50 static bool allow_duplicates; 51 module_param(allow_duplicates, bool, 0644); 52 53 static int disable_backlight_sysfs_if = -1; 54 module_param(disable_backlight_sysfs_if, int, 0444); 55 56 #define REPORT_OUTPUT_KEY_EVENTS 0x01 57 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 58 static int report_key_events = -1; 59 module_param(report_key_events, int, 0644); 60 MODULE_PARM_DESC(report_key_events, 61 "0: none, 1: output changes, 2: brightness changes, 3: all"); 62 63 static int hw_changes_brightness = -1; 64 module_param(hw_changes_brightness, int, 0644); 65 MODULE_PARM_DESC(hw_changes_brightness, 66 "Set this to 1 on buggy hw which changes the brightness itself when " 67 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); 68 69 /* 70 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 71 * assumed even if not actually set. 72 */ 73 static bool device_id_scheme = false; 74 module_param(device_id_scheme, bool, 0444); 75 76 static int only_lcd = -1; 77 module_param(only_lcd, int, 0444); 78 79 static int register_count; 80 static DEFINE_MUTEX(register_count_mutex); 81 static DEFINE_MUTEX(video_list_lock); 82 static LIST_HEAD(video_bus_head); 83 static int acpi_video_bus_add(struct acpi_device *device); 84 static int acpi_video_bus_remove(struct acpi_device *device); 85 static void acpi_video_bus_notify(struct acpi_device *device, u32 event); 86 void acpi_video_detect_exit(void); 87 88 /* 89 * Indices in the _BCL method response: the first two items are special, 90 * the rest are all supported levels. 91 * 92 * See page 575 of the ACPI spec 3.0 93 */ 94 enum acpi_video_level_idx { 95 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 96 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 97 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 98 }; 99 100 static const struct acpi_device_id video_device_ids[] = { 101 {ACPI_VIDEO_HID, 0}, 102 {"", 0}, 103 }; 104 MODULE_DEVICE_TABLE(acpi, video_device_ids); 105 106 static struct acpi_driver acpi_video_bus = { 107 .name = "video", 108 .class = ACPI_VIDEO_CLASS, 109 .ids = video_device_ids, 110 .ops = { 111 .add = acpi_video_bus_add, 112 .remove = acpi_video_bus_remove, 113 .notify = acpi_video_bus_notify, 114 }, 115 }; 116 117 struct acpi_video_bus_flags { 118 u8 multihead:1; /* can switch video heads */ 119 u8 rom:1; /* can retrieve a video rom */ 120 u8 post:1; /* can configure the head to */ 121 u8 reserved:5; 122 }; 123 124 struct acpi_video_bus_cap { 125 u8 _DOS:1; /* Enable/Disable output switching */ 126 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 127 u8 _ROM:1; /* Get ROM Data */ 128 u8 _GPD:1; /* Get POST Device */ 129 u8 _SPD:1; /* Set POST Device */ 130 u8 _VPO:1; /* Video POST Options */ 131 u8 reserved:2; 132 }; 133 134 struct acpi_video_device_attrib { 135 u32 display_index:4; /* A zero-based instance of the Display */ 136 u32 display_port_attachment:4; /* This field differentiates the display type */ 137 u32 display_type:4; /* Describe the specific type in use */ 138 u32 vendor_specific:4; /* Chipset Vendor Specific */ 139 u32 bios_can_detect:1; /* BIOS can detect the device */ 140 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 141 the VGA device. */ 142 u32 pipe_id:3; /* For VGA multiple-head devices. */ 143 u32 reserved:10; /* Must be 0 */ 144 145 /* 146 * The device ID might not actually follow the scheme described by this 147 * struct acpi_video_device_attrib. If it does, then this bit 148 * device_id_scheme is set; otherwise, other fields should be ignored. 149 * 150 * (but also see the global flag device_id_scheme) 151 */ 152 u32 device_id_scheme:1; 153 }; 154 155 struct acpi_video_enumerated_device { 156 union { 157 u32 int_val; 158 struct acpi_video_device_attrib attrib; 159 } value; 160 struct acpi_video_device *bind_info; 161 }; 162 163 struct acpi_video_bus { 164 struct acpi_device *device; 165 bool backlight_registered; 166 u8 dos_setting; 167 struct acpi_video_enumerated_device *attached_array; 168 u8 attached_count; 169 u8 child_count; 170 struct acpi_video_bus_cap cap; 171 struct acpi_video_bus_flags flags; 172 struct list_head video_device_list; 173 struct mutex device_list_lock; /* protects video_device_list */ 174 struct list_head entry; 175 struct input_dev *input; 176 char phys[32]; /* for input device */ 177 struct notifier_block pm_nb; 178 }; 179 180 struct acpi_video_device_flags { 181 u8 crt:1; 182 u8 lcd:1; 183 u8 tvout:1; 184 u8 dvi:1; 185 u8 bios:1; 186 u8 unknown:1; 187 u8 notify:1; 188 u8 reserved:1; 189 }; 190 191 struct acpi_video_device_cap { 192 u8 _ADR:1; /* Return the unique ID */ 193 u8 _BCL:1; /* Query list of brightness control levels supported */ 194 u8 _BCM:1; /* Set the brightness level */ 195 u8 _BQC:1; /* Get current brightness level */ 196 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 197 u8 _DDC:1; /* Return the EDID for this device */ 198 }; 199 200 struct acpi_video_device { 201 unsigned long device_id; 202 struct acpi_video_device_flags flags; 203 struct acpi_video_device_cap cap; 204 struct list_head entry; 205 struct delayed_work switch_brightness_work; 206 int switch_brightness_event; 207 struct acpi_video_bus *video; 208 struct acpi_device *dev; 209 struct acpi_video_device_brightness *brightness; 210 struct backlight_device *backlight; 211 struct thermal_cooling_device *cooling_dev; 212 }; 213 214 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 215 static void acpi_video_device_rebind(struct acpi_video_bus *video); 216 static void acpi_video_device_bind(struct acpi_video_bus *video, 217 struct acpi_video_device *device); 218 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 219 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 220 int level); 221 static int acpi_video_device_lcd_get_level_current( 222 struct acpi_video_device *device, 223 unsigned long long *level, bool raw); 224 static int acpi_video_get_next_level(struct acpi_video_device *device, 225 u32 level_current, u32 event); 226 static void acpi_video_switch_brightness(struct work_struct *work); 227 228 /* backlight device sysfs support */ 229 static int acpi_video_get_brightness(struct backlight_device *bd) 230 { 231 unsigned long long cur_level; 232 int i; 233 struct acpi_video_device *vd = bl_get_data(bd); 234 235 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 236 return -EINVAL; 237 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 238 if (vd->brightness->levels[i] == cur_level) 239 return i - ACPI_VIDEO_FIRST_LEVEL; 240 } 241 return 0; 242 } 243 244 static int acpi_video_set_brightness(struct backlight_device *bd) 245 { 246 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 247 struct acpi_video_device *vd = bl_get_data(bd); 248 249 cancel_delayed_work(&vd->switch_brightness_work); 250 return acpi_video_device_lcd_set_level(vd, 251 vd->brightness->levels[request_level]); 252 } 253 254 static const struct backlight_ops acpi_backlight_ops = { 255 .get_brightness = acpi_video_get_brightness, 256 .update_status = acpi_video_set_brightness, 257 }; 258 259 /* thermal cooling device callbacks */ 260 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 261 unsigned long *state) 262 { 263 struct acpi_device *device = cooling_dev->devdata; 264 struct acpi_video_device *video = acpi_driver_data(device); 265 266 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 267 return 0; 268 } 269 270 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 271 unsigned long *state) 272 { 273 struct acpi_device *device = cooling_dev->devdata; 274 struct acpi_video_device *video = acpi_driver_data(device); 275 unsigned long long level; 276 int offset; 277 278 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 279 return -EINVAL; 280 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 281 offset++) 282 if (level == video->brightness->levels[offset]) { 283 *state = video->brightness->count - offset - 1; 284 return 0; 285 } 286 287 return -EINVAL; 288 } 289 290 static int 291 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 292 { 293 struct acpi_device *device = cooling_dev->devdata; 294 struct acpi_video_device *video = acpi_driver_data(device); 295 int level; 296 297 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 298 return -EINVAL; 299 300 state = video->brightness->count - state; 301 level = video->brightness->levels[state - 1]; 302 return acpi_video_device_lcd_set_level(video, level); 303 } 304 305 static const struct thermal_cooling_device_ops video_cooling_ops = { 306 .get_max_state = video_get_max_state, 307 .get_cur_state = video_get_cur_state, 308 .set_cur_state = video_set_cur_state, 309 }; 310 311 /* 312 * -------------------------------------------------------------------------- 313 * Video Management 314 * -------------------------------------------------------------------------- 315 */ 316 317 static int 318 acpi_video_device_lcd_query_levels(acpi_handle handle, 319 union acpi_object **levels) 320 { 321 int status; 322 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 323 union acpi_object *obj; 324 325 326 *levels = NULL; 327 328 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 329 if (!ACPI_SUCCESS(status)) 330 return status; 331 obj = (union acpi_object *)buffer.pointer; 332 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 333 printk(KERN_ERR PREFIX "Invalid _BCL data\n"); 334 status = -EFAULT; 335 goto err; 336 } 337 338 *levels = obj; 339 340 return 0; 341 342 err: 343 kfree(buffer.pointer); 344 345 return status; 346 } 347 348 static int 349 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 350 { 351 int status; 352 int state; 353 354 status = acpi_execute_simple_method(device->dev->handle, 355 "_BCM", level); 356 if (ACPI_FAILURE(status)) { 357 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed")); 358 return -EIO; 359 } 360 361 device->brightness->curr = level; 362 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 363 state++) 364 if (level == device->brightness->levels[state]) { 365 if (device->backlight) 366 device->backlight->props.brightness = 367 state - ACPI_VIDEO_FIRST_LEVEL; 368 return 0; 369 } 370 371 ACPI_ERROR((AE_INFO, "Current brightness invalid")); 372 return -EINVAL; 373 } 374 375 /* 376 * For some buggy _BQC methods, we need to add a constant value to 377 * the _BQC return value to get the actual current brightness level 378 */ 379 380 static int bqc_offset_aml_bug_workaround; 381 static int video_set_bqc_offset(const struct dmi_system_id *d) 382 { 383 bqc_offset_aml_bug_workaround = 9; 384 return 0; 385 } 386 387 static int video_disable_backlight_sysfs_if( 388 const struct dmi_system_id *d) 389 { 390 if (disable_backlight_sysfs_if == -1) 391 disable_backlight_sysfs_if = 1; 392 return 0; 393 } 394 395 static int video_set_device_id_scheme(const struct dmi_system_id *d) 396 { 397 device_id_scheme = true; 398 return 0; 399 } 400 401 static int video_enable_only_lcd(const struct dmi_system_id *d) 402 { 403 only_lcd = true; 404 return 0; 405 } 406 407 static int video_set_report_key_events(const struct dmi_system_id *id) 408 { 409 if (report_key_events == -1) 410 report_key_events = (uintptr_t)id->driver_data; 411 return 0; 412 } 413 414 static int video_hw_changes_brightness( 415 const struct dmi_system_id *d) 416 { 417 if (hw_changes_brightness == -1) 418 hw_changes_brightness = 1; 419 return 0; 420 } 421 422 static const struct dmi_system_id video_dmi_table[] = { 423 /* 424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 425 */ 426 { 427 .callback = video_set_bqc_offset, 428 .ident = "Acer Aspire 5720", 429 .matches = { 430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 432 }, 433 }, 434 { 435 .callback = video_set_bqc_offset, 436 .ident = "Acer Aspire 5710Z", 437 .matches = { 438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 440 }, 441 }, 442 { 443 .callback = video_set_bqc_offset, 444 .ident = "eMachines E510", 445 .matches = { 446 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 447 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 448 }, 449 }, 450 { 451 .callback = video_set_bqc_offset, 452 .ident = "Acer Aspire 5315", 453 .matches = { 454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 456 }, 457 }, 458 { 459 .callback = video_set_bqc_offset, 460 .ident = "Acer Aspire 7720", 461 .matches = { 462 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 463 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 464 }, 465 }, 466 467 /* 468 * Some machines have a broken acpi-video interface for brightness 469 * control, but still need an acpi_video_device_lcd_set_level() call 470 * on resume to turn the backlight power on. We Enable backlight 471 * control on these systems, but do not register a backlight sysfs 472 * as brightness control does not work. 473 */ 474 { 475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 476 .callback = video_disable_backlight_sysfs_if, 477 .ident = "Toshiba Portege R700", 478 .matches = { 479 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 480 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"), 481 }, 482 }, 483 { 484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */ 485 .callback = video_disable_backlight_sysfs_if, 486 .ident = "Toshiba Portege R830", 487 .matches = { 488 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 489 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"), 490 }, 491 }, 492 { 493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 494 .callback = video_disable_backlight_sysfs_if, 495 .ident = "Toshiba Satellite R830", 496 .matches = { 497 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 498 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"), 499 }, 500 }, 501 /* 502 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 503 * but the IDs actually follow the Device ID Scheme. 504 */ 505 { 506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 507 .callback = video_set_device_id_scheme, 508 .ident = "ESPRIMO Mobile M9410", 509 .matches = { 510 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 511 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 512 }, 513 }, 514 /* 515 * Some machines have multiple video output devices, but only the one 516 * that is the type of LCD can do the backlight control so we should not 517 * register backlight interface for other video output devices. 518 */ 519 { 520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 521 .callback = video_enable_only_lcd, 522 .ident = "ESPRIMO Mobile M9410", 523 .matches = { 524 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 525 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 526 }, 527 }, 528 /* 529 * Some machines report wrong key events on the acpi-bus, suppress 530 * key event reporting on these. Note this is only intended to work 531 * around events which are plain wrong. In some cases we get double 532 * events, in this case acpi-video is considered the canonical source 533 * and the events from the other source should be filtered. E.g. 534 * by calling acpi_video_handles_brightness_key_presses() from the 535 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 536 */ 537 { 538 .callback = video_set_report_key_events, 539 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 540 .ident = "Dell Vostro V131", 541 .matches = { 542 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 543 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 544 }, 545 }, 546 /* 547 * Some machines change the brightness themselves when a brightness 548 * hotkey gets pressed, despite us telling them not to. In this case 549 * acpi_video_device_notify() should only call backlight_force_update( 550 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 551 */ 552 { 553 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 554 .callback = video_hw_changes_brightness, 555 .ident = "Packard Bell EasyNote MZ35", 556 .matches = { 557 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 558 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 559 }, 560 }, 561 {} 562 }; 563 564 static unsigned long long 565 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 566 unsigned long long bqc_value) 567 { 568 unsigned long long level; 569 570 if (device->brightness->flags._BQC_use_index) { 571 /* 572 * _BQC returns an index that doesn't account for the first 2 573 * items with special meaning (see enum acpi_video_level_idx), 574 * so we need to compensate for that by offsetting ourselves 575 */ 576 if (device->brightness->flags._BCL_reversed) 577 bqc_value = device->brightness->count - 578 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 579 580 level = device->brightness->levels[bqc_value + 581 ACPI_VIDEO_FIRST_LEVEL]; 582 } else { 583 level = bqc_value; 584 } 585 586 level += bqc_offset_aml_bug_workaround; 587 588 return level; 589 } 590 591 static int 592 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 593 unsigned long long *level, bool raw) 594 { 595 acpi_status status = AE_OK; 596 int i; 597 598 if (device->cap._BQC || device->cap._BCQ) { 599 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 600 601 status = acpi_evaluate_integer(device->dev->handle, buf, 602 NULL, level); 603 if (ACPI_SUCCESS(status)) { 604 if (raw) { 605 /* 606 * Caller has indicated he wants the raw 607 * value returned by _BQC, so don't furtherly 608 * mess with the value. 609 */ 610 return 0; 611 } 612 613 *level = acpi_video_bqc_value_to_level(device, *level); 614 615 for (i = ACPI_VIDEO_FIRST_LEVEL; 616 i < device->brightness->count; i++) 617 if (device->brightness->levels[i] == *level) { 618 device->brightness->curr = *level; 619 return 0; 620 } 621 /* 622 * BQC returned an invalid level. 623 * Stop using it. 624 */ 625 ACPI_WARNING((AE_INFO, 626 "%s returned an invalid level", 627 buf)); 628 device->cap._BQC = device->cap._BCQ = 0; 629 } else { 630 /* 631 * Fixme: 632 * should we return an error or ignore this failure? 633 * dev->brightness->curr is a cached value which stores 634 * the correct current backlight level in most cases. 635 * ACPI video backlight still works w/ buggy _BQC. 636 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 637 */ 638 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf)); 639 device->cap._BQC = device->cap._BCQ = 0; 640 } 641 } 642 643 *level = device->brightness->curr; 644 return 0; 645 } 646 647 static int 648 acpi_video_device_EDID(struct acpi_video_device *device, 649 union acpi_object **edid, ssize_t length) 650 { 651 int status; 652 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 653 union acpi_object *obj; 654 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 655 struct acpi_object_list args = { 1, &arg0 }; 656 657 658 *edid = NULL; 659 660 if (!device) 661 return -ENODEV; 662 if (length == 128) 663 arg0.integer.value = 1; 664 else if (length == 256) 665 arg0.integer.value = 2; 666 else 667 return -EINVAL; 668 669 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 670 if (ACPI_FAILURE(status)) 671 return -ENODEV; 672 673 obj = buffer.pointer; 674 675 if (obj && obj->type == ACPI_TYPE_BUFFER) 676 *edid = obj; 677 else { 678 printk(KERN_ERR PREFIX "Invalid _DDC data\n"); 679 status = -EFAULT; 680 kfree(obj); 681 } 682 683 return status; 684 } 685 686 /* bus */ 687 688 /* 689 * Arg: 690 * video : video bus device pointer 691 * bios_flag : 692 * 0. The system BIOS should NOT automatically switch(toggle) 693 * the active display output. 694 * 1. The system BIOS should automatically switch (toggle) the 695 * active display output. No switch event. 696 * 2. The _DGS value should be locked. 697 * 3. The system BIOS should not automatically switch (toggle) the 698 * active display output, but instead generate the display switch 699 * event notify code. 700 * lcd_flag : 701 * 0. The system BIOS should automatically control the brightness level 702 * of the LCD when the power changes from AC to DC 703 * 1. The system BIOS should NOT automatically control the brightness 704 * level of the LCD when the power changes from AC to DC. 705 * Return Value: 706 * -EINVAL wrong arg. 707 */ 708 709 static int 710 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 711 { 712 acpi_status status; 713 714 if (!video->cap._DOS) 715 return 0; 716 717 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 718 return -EINVAL; 719 video->dos_setting = (lcd_flag << 2) | bios_flag; 720 status = acpi_execute_simple_method(video->device->handle, "_DOS", 721 (lcd_flag << 2) | bios_flag); 722 if (ACPI_FAILURE(status)) 723 return -EIO; 724 725 return 0; 726 } 727 728 /* 729 * Simple comparison function used to sort backlight levels. 730 */ 731 732 static int 733 acpi_video_cmp_level(const void *a, const void *b) 734 { 735 return *(int *)a - *(int *)b; 736 } 737 738 /* 739 * Decides if _BQC/_BCQ for this system is usable 740 * 741 * We do this by changing the level first and then read out the current 742 * brightness level, if the value does not match, find out if it is using 743 * index. If not, clear the _BQC/_BCQ capability. 744 */ 745 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 746 int max_level, int current_level) 747 { 748 struct acpi_video_device_brightness *br = device->brightness; 749 int result; 750 unsigned long long level; 751 int test_level; 752 753 /* don't mess with existing known broken systems */ 754 if (bqc_offset_aml_bug_workaround) 755 return 0; 756 757 /* 758 * Some systems always report current brightness level as maximum 759 * through _BQC, we need to test another value for them. However, 760 * there is a subtlety: 761 * 762 * If the _BCL package ordering is descending, the first level 763 * (br->levels[2]) is likely to be 0, and if the number of levels 764 * matches the number of steps, we might confuse a returned level to 765 * mean the index. 766 * 767 * For example: 768 * 769 * current_level = max_level = 100 770 * test_level = 0 771 * returned level = 100 772 * 773 * In this case 100 means the level, not the index, and _BCM failed. 774 * Still, if the _BCL package ordering is descending, the index of 775 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 776 * 777 * This causes all _BQC calls to return bogus values causing weird 778 * behavior from the user's perspective. For example: 779 * 780 * xbacklight -set 10; xbacklight -set 20; 781 * 782 * would flash to 90% and then slowly down to the desired level (20). 783 * 784 * The solution is simple; test anything other than the first level 785 * (e.g. 1). 786 */ 787 test_level = current_level == max_level 788 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 789 : max_level; 790 791 result = acpi_video_device_lcd_set_level(device, test_level); 792 if (result) 793 return result; 794 795 result = acpi_video_device_lcd_get_level_current(device, &level, true); 796 if (result) 797 return result; 798 799 if (level != test_level) { 800 /* buggy _BQC found, need to find out if it uses index */ 801 if (level < br->count) { 802 if (br->flags._BCL_reversed) 803 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 804 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 805 br->flags._BQC_use_index = 1; 806 } 807 808 if (!br->flags._BQC_use_index) 809 device->cap._BQC = device->cap._BCQ = 0; 810 } 811 812 return 0; 813 } 814 815 int acpi_video_get_levels(struct acpi_device *device, 816 struct acpi_video_device_brightness **dev_br, 817 int *pmax_level) 818 { 819 union acpi_object *obj = NULL; 820 int i, max_level = 0, count = 0, level_ac_battery = 0; 821 union acpi_object *o; 822 struct acpi_video_device_brightness *br = NULL; 823 int result = 0; 824 u32 value; 825 826 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle, 827 &obj))) { 828 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available " 829 "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 printk(KERN_ERR "can't allocate memory\n"); 842 result = -ENOMEM; 843 goto out; 844 } 845 846 /* 847 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 848 * in order to account for buggy BIOS which don't export the first two 849 * special levels (see below) 850 */ 851 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 852 sizeof(*br->levels), 853 GFP_KERNEL); 854 if (!br->levels) { 855 result = -ENOMEM; 856 goto out_free; 857 } 858 859 for (i = 0; i < obj->package.count; i++) { 860 o = (union acpi_object *)&obj->package.elements[i]; 861 if (o->type != ACPI_TYPE_INTEGER) { 862 printk(KERN_ERR PREFIX "Invalid data\n"); 863 continue; 864 } 865 value = (u32) o->integer.value; 866 /* Skip duplicate entries */ 867 if (count > ACPI_VIDEO_FIRST_LEVEL 868 && br->levels[count - 1] == value) 869 continue; 870 871 br->levels[count] = value; 872 873 if (br->levels[count] > max_level) 874 max_level = br->levels[count]; 875 count++; 876 } 877 878 /* 879 * some buggy BIOS don't export the levels 880 * when machine is on AC/Battery in _BCL package. 881 * In this case, the first two elements in _BCL packages 882 * are also supported brightness levels that OS should take care of. 883 */ 884 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 885 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 886 level_ac_battery++; 887 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 888 level_ac_battery++; 889 } 890 891 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 892 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 893 br->flags._BCL_no_ac_battery_levels = 1; 894 for (i = (count - 1 + level_ac_battery); 895 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 896 br->levels[i] = br->levels[i - level_ac_battery]; 897 count += level_ac_battery; 898 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 899 ACPI_ERROR((AE_INFO, "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_ERROR((AE_INFO, 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 = -EINVAL; 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_DEBUG_PRINT((ACPI_DB_INFO, 989 "found %d brightness levels\n", 990 br->count - ACPI_VIDEO_FIRST_LEVEL)); 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 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n"); 1023 device->cap._BCQ = 1; 1024 } 1025 1026 if (acpi_has_method(device->dev->handle, "_DDC")) 1027 device->cap._DDC = 1; 1028 } 1029 1030 /* 1031 * Arg: 1032 * device : video output device (VGA) 1033 * 1034 * Return Value: 1035 * None 1036 * 1037 * Find out all required AML methods defined under the video bus device. 1038 */ 1039 1040 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1041 { 1042 if (acpi_has_method(video->device->handle, "_DOS")) 1043 video->cap._DOS = 1; 1044 if (acpi_has_method(video->device->handle, "_DOD")) 1045 video->cap._DOD = 1; 1046 if (acpi_has_method(video->device->handle, "_ROM")) 1047 video->cap._ROM = 1; 1048 if (acpi_has_method(video->device->handle, "_GPD")) 1049 video->cap._GPD = 1; 1050 if (acpi_has_method(video->device->handle, "_SPD")) 1051 video->cap._SPD = 1; 1052 if (acpi_has_method(video->device->handle, "_VPO")) 1053 video->cap._VPO = 1; 1054 } 1055 1056 /* 1057 * Check whether the video bus device has required AML method to 1058 * support the desired features 1059 */ 1060 1061 static int acpi_video_bus_check(struct acpi_video_bus *video) 1062 { 1063 acpi_status status = -ENOENT; 1064 struct pci_dev *dev; 1065 1066 if (!video) 1067 return -EINVAL; 1068 1069 dev = acpi_get_pci_dev(video->device->handle); 1070 if (!dev) 1071 return -ENODEV; 1072 pci_dev_put(dev); 1073 1074 /* 1075 * Since there is no HID, CID and so on for VGA driver, we have 1076 * to check well known required nodes. 1077 */ 1078 1079 /* Does this device support video switching? */ 1080 if (video->cap._DOS || video->cap._DOD) { 1081 if (!video->cap._DOS) { 1082 printk(KERN_WARNING FW_BUG 1083 "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_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i)); 1272 } 1273 } 1274 } 1275 1276 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1277 { 1278 struct acpi_video_bus *video = device->video; 1279 int i; 1280 1281 /* 1282 * If we have a broken _DOD or we have more than 8 output devices 1283 * under the graphics controller node that we can't proper deal with 1284 * in the operation region code currently, no need to test. 1285 */ 1286 if (!video->attached_count || video->child_count > 8) 1287 return true; 1288 1289 for (i = 0; i < video->attached_count; i++) { 1290 if ((video->attached_array[i].value.int_val & 0xfff) == 1291 (device->device_id & 0xfff)) 1292 return true; 1293 } 1294 1295 return false; 1296 } 1297 1298 /* 1299 * Arg: 1300 * video : video bus device 1301 * 1302 * Return: 1303 * < 0 : error 1304 * 1305 * Call _DOD to enumerate all devices attached to display adapter 1306 * 1307 */ 1308 1309 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1310 { 1311 int status; 1312 int count; 1313 int i; 1314 struct acpi_video_enumerated_device *active_list; 1315 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1316 union acpi_object *dod = NULL; 1317 union acpi_object *obj; 1318 1319 if (!video->cap._DOD) 1320 return AE_NOT_EXIST; 1321 1322 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1323 if (!ACPI_SUCCESS(status)) { 1324 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD")); 1325 return status; 1326 } 1327 1328 dod = buffer.pointer; 1329 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1330 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data")); 1331 status = -EFAULT; 1332 goto out; 1333 } 1334 1335 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n", 1336 dod->package.count)); 1337 1338 active_list = kcalloc(1 + dod->package.count, 1339 sizeof(struct acpi_video_enumerated_device), 1340 GFP_KERNEL); 1341 if (!active_list) { 1342 status = -ENOMEM; 1343 goto out; 1344 } 1345 1346 count = 0; 1347 for (i = 0; i < dod->package.count; i++) { 1348 obj = &dod->package.elements[i]; 1349 1350 if (obj->type != ACPI_TYPE_INTEGER) { 1351 printk(KERN_ERR PREFIX 1352 "Invalid _DOD data in element %d\n", i); 1353 continue; 1354 } 1355 1356 active_list[count].value.int_val = obj->integer.value; 1357 active_list[count].bind_info = NULL; 1358 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, 1359 (int)obj->integer.value)); 1360 count++; 1361 } 1362 1363 kfree(video->attached_array); 1364 1365 video->attached_array = active_list; 1366 video->attached_count = count; 1367 1368 out: 1369 kfree(buffer.pointer); 1370 return status; 1371 } 1372 1373 static int 1374 acpi_video_get_next_level(struct acpi_video_device *device, 1375 u32 level_current, u32 event) 1376 { 1377 int min, max, min_above, max_below, i, l, delta = 255; 1378 max = max_below = 0; 1379 min = min_above = 255; 1380 /* Find closest level to level_current */ 1381 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1382 l = device->brightness->levels[i]; 1383 if (abs(l - level_current) < abs(delta)) { 1384 delta = l - level_current; 1385 if (!delta) 1386 break; 1387 } 1388 } 1389 /* Ajust level_current to closest available level */ 1390 level_current += delta; 1391 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1392 l = device->brightness->levels[i]; 1393 if (l < min) 1394 min = l; 1395 if (l > max) 1396 max = l; 1397 if (l < min_above && l > level_current) 1398 min_above = l; 1399 if (l > max_below && l < level_current) 1400 max_below = l; 1401 } 1402 1403 switch (event) { 1404 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1405 return (level_current < max) ? min_above : min; 1406 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1407 return (level_current < max) ? min_above : max; 1408 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1409 return (level_current > min) ? max_below : min; 1410 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1411 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1412 return 0; 1413 default: 1414 return level_current; 1415 } 1416 } 1417 1418 static void 1419 acpi_video_switch_brightness(struct work_struct *work) 1420 { 1421 struct acpi_video_device *device = container_of(to_delayed_work(work), 1422 struct acpi_video_device, switch_brightness_work); 1423 unsigned long long level_current, level_next; 1424 int event = device->switch_brightness_event; 1425 int result = -EINVAL; 1426 1427 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1428 if (!device->backlight) 1429 return; 1430 1431 if (!device->brightness) 1432 goto out; 1433 1434 result = acpi_video_device_lcd_get_level_current(device, 1435 &level_current, 1436 false); 1437 if (result) 1438 goto out; 1439 1440 level_next = acpi_video_get_next_level(device, level_current, event); 1441 1442 result = acpi_video_device_lcd_set_level(device, level_next); 1443 1444 if (!result) 1445 backlight_force_update(device->backlight, 1446 BACKLIGHT_UPDATE_HOTKEY); 1447 1448 out: 1449 if (result) 1450 printk(KERN_ERR PREFIX "Failed to switch the brightness\n"); 1451 } 1452 1453 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1454 void **edid) 1455 { 1456 struct acpi_video_bus *video; 1457 struct acpi_video_device *video_device; 1458 union acpi_object *buffer = NULL; 1459 acpi_status status; 1460 int i, length; 1461 1462 if (!device || !acpi_driver_data(device)) 1463 return -EINVAL; 1464 1465 video = acpi_driver_data(device); 1466 1467 for (i = 0; i < video->attached_count; i++) { 1468 video_device = video->attached_array[i].bind_info; 1469 length = 256; 1470 1471 if (!video_device) 1472 continue; 1473 1474 if (!video_device->cap._DDC) 1475 continue; 1476 1477 if (type) { 1478 switch (type) { 1479 case ACPI_VIDEO_DISPLAY_CRT: 1480 if (!video_device->flags.crt) 1481 continue; 1482 break; 1483 case ACPI_VIDEO_DISPLAY_TV: 1484 if (!video_device->flags.tvout) 1485 continue; 1486 break; 1487 case ACPI_VIDEO_DISPLAY_DVI: 1488 if (!video_device->flags.dvi) 1489 continue; 1490 break; 1491 case ACPI_VIDEO_DISPLAY_LCD: 1492 if (!video_device->flags.lcd) 1493 continue; 1494 break; 1495 } 1496 } else if (video_device->device_id != device_id) { 1497 continue; 1498 } 1499 1500 status = acpi_video_device_EDID(video_device, &buffer, length); 1501 1502 if (ACPI_FAILURE(status) || !buffer || 1503 buffer->type != ACPI_TYPE_BUFFER) { 1504 length = 128; 1505 status = acpi_video_device_EDID(video_device, &buffer, 1506 length); 1507 if (ACPI_FAILURE(status) || !buffer || 1508 buffer->type != ACPI_TYPE_BUFFER) { 1509 continue; 1510 } 1511 } 1512 1513 *edid = buffer->buffer.pointer; 1514 return length; 1515 } 1516 1517 return -ENODEV; 1518 } 1519 EXPORT_SYMBOL(acpi_video_get_edid); 1520 1521 static int 1522 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1523 struct acpi_device *device) 1524 { 1525 int status = 0; 1526 struct acpi_device *dev; 1527 1528 /* 1529 * There are systems where video module known to work fine regardless 1530 * of broken _DOD and ignoring returned value here doesn't cause 1531 * any issues later. 1532 */ 1533 acpi_video_device_enumerate(video); 1534 1535 list_for_each_entry(dev, &device->children, node) { 1536 1537 status = acpi_video_bus_get_one_device(dev, video); 1538 if (status) { 1539 dev_err(&dev->dev, "Can't attach device\n"); 1540 break; 1541 } 1542 video->child_count++; 1543 } 1544 return status; 1545 } 1546 1547 /* acpi_video interface */ 1548 1549 /* 1550 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1551 * preform any automatic brightness change on receiving a notification. 1552 */ 1553 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1554 { 1555 return acpi_video_bus_DOS(video, 0, 1556 acpi_osi_is_win8() ? 1 : 0); 1557 } 1558 1559 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1560 { 1561 return acpi_video_bus_DOS(video, 0, 1562 acpi_osi_is_win8() ? 0 : 1); 1563 } 1564 1565 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1566 { 1567 struct acpi_video_bus *video = acpi_driver_data(device); 1568 struct input_dev *input; 1569 int keycode = 0; 1570 1571 if (!video || !video->input) 1572 return; 1573 1574 input = video->input; 1575 1576 switch (event) { 1577 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1578 * most likely via hotkey. */ 1579 keycode = KEY_SWITCHVIDEOMODE; 1580 break; 1581 1582 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1583 * connector. */ 1584 acpi_video_device_enumerate(video); 1585 acpi_video_device_rebind(video); 1586 keycode = KEY_SWITCHVIDEOMODE; 1587 break; 1588 1589 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1590 keycode = KEY_SWITCHVIDEOMODE; 1591 break; 1592 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1593 keycode = KEY_VIDEO_NEXT; 1594 break; 1595 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1596 keycode = KEY_VIDEO_PREV; 1597 break; 1598 1599 default: 1600 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1601 "Unsupported event [0x%x]\n", event)); 1602 break; 1603 } 1604 1605 if (acpi_notifier_call_chain(device, event, 0)) 1606 /* Something vetoed the keypress. */ 1607 keycode = 0; 1608 1609 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1610 input_report_key(input, keycode, 1); 1611 input_sync(input); 1612 input_report_key(input, keycode, 0); 1613 input_sync(input); 1614 } 1615 1616 return; 1617 } 1618 1619 static void brightness_switch_event(struct acpi_video_device *video_device, 1620 u32 event) 1621 { 1622 if (!brightness_switch_enabled) 1623 return; 1624 1625 video_device->switch_brightness_event = event; 1626 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1627 } 1628 1629 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1630 { 1631 struct acpi_video_device *video_device = data; 1632 struct acpi_device *device = NULL; 1633 struct acpi_video_bus *bus; 1634 struct input_dev *input; 1635 int keycode = 0; 1636 1637 if (!video_device) 1638 return; 1639 1640 device = video_device->dev; 1641 bus = video_device->video; 1642 input = bus->input; 1643 1644 if (hw_changes_brightness > 0) { 1645 if (video_device->backlight) 1646 backlight_force_update(video_device->backlight, 1647 BACKLIGHT_UPDATE_HOTKEY); 1648 acpi_notifier_call_chain(device, event, 0); 1649 return; 1650 } 1651 1652 switch (event) { 1653 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1654 brightness_switch_event(video_device, event); 1655 keycode = KEY_BRIGHTNESS_CYCLE; 1656 break; 1657 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1658 brightness_switch_event(video_device, event); 1659 keycode = KEY_BRIGHTNESSUP; 1660 break; 1661 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1662 brightness_switch_event(video_device, event); 1663 keycode = KEY_BRIGHTNESSDOWN; 1664 break; 1665 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1666 brightness_switch_event(video_device, event); 1667 keycode = KEY_BRIGHTNESS_ZERO; 1668 break; 1669 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1670 brightness_switch_event(video_device, event); 1671 keycode = KEY_DISPLAY_OFF; 1672 break; 1673 default: 1674 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1675 "Unsupported event [0x%x]\n", event)); 1676 break; 1677 } 1678 1679 acpi_notifier_call_chain(device, event, 0); 1680 1681 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1682 input_report_key(input, keycode, 1); 1683 input_sync(input); 1684 input_report_key(input, keycode, 0); 1685 input_sync(input); 1686 } 1687 1688 return; 1689 } 1690 1691 static int acpi_video_resume(struct notifier_block *nb, 1692 unsigned long val, void *ign) 1693 { 1694 struct acpi_video_bus *video; 1695 struct acpi_video_device *video_device; 1696 int i; 1697 1698 switch (val) { 1699 case PM_HIBERNATION_PREPARE: 1700 case PM_SUSPEND_PREPARE: 1701 case PM_RESTORE_PREPARE: 1702 return NOTIFY_DONE; 1703 } 1704 1705 video = container_of(nb, struct acpi_video_bus, pm_nb); 1706 1707 dev_info(&video->device->dev, "Restoring backlight state\n"); 1708 1709 for (i = 0; i < video->attached_count; i++) { 1710 video_device = video->attached_array[i].bind_info; 1711 if (video_device && video_device->brightness) 1712 acpi_video_device_lcd_set_level(video_device, 1713 video_device->brightness->curr); 1714 } 1715 1716 return NOTIFY_OK; 1717 } 1718 1719 static acpi_status 1720 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1721 void **return_value) 1722 { 1723 struct acpi_device *device = context; 1724 struct acpi_device *sibling; 1725 int result; 1726 1727 if (handle == device->handle) 1728 return AE_CTRL_TERMINATE; 1729 1730 result = acpi_bus_get_device(handle, &sibling); 1731 if (result) 1732 return AE_OK; 1733 1734 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1735 return AE_ALREADY_EXISTS; 1736 1737 return AE_OK; 1738 } 1739 1740 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1741 { 1742 struct backlight_properties props; 1743 struct pci_dev *pdev; 1744 acpi_handle acpi_parent; 1745 struct device *parent = NULL; 1746 int result; 1747 static int count; 1748 char *name; 1749 1750 result = acpi_video_init_brightness(device); 1751 if (result) 1752 return; 1753 1754 if (disable_backlight_sysfs_if > 0) 1755 return; 1756 1757 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1758 if (!name) 1759 return; 1760 count++; 1761 1762 acpi_get_parent(device->dev->handle, &acpi_parent); 1763 1764 pdev = acpi_get_pci_dev(acpi_parent); 1765 if (pdev) { 1766 parent = &pdev->dev; 1767 pci_dev_put(pdev); 1768 } 1769 1770 memset(&props, 0, sizeof(struct backlight_properties)); 1771 props.type = BACKLIGHT_FIRMWARE; 1772 props.max_brightness = 1773 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1774 device->backlight = backlight_device_register(name, 1775 parent, 1776 device, 1777 &acpi_backlight_ops, 1778 &props); 1779 kfree(name); 1780 if (IS_ERR(device->backlight)) { 1781 device->backlight = NULL; 1782 return; 1783 } 1784 1785 /* 1786 * Save current brightness level in case we have to restore it 1787 * before acpi_video_device_lcd_set_level() is called next time. 1788 */ 1789 device->backlight->props.brightness = 1790 acpi_video_get_brightness(device->backlight); 1791 1792 device->cooling_dev = thermal_cooling_device_register("LCD", 1793 device->dev, &video_cooling_ops); 1794 if (IS_ERR(device->cooling_dev)) { 1795 /* 1796 * Set cooling_dev to NULL so we don't crash trying to free it. 1797 * Also, why the hell we are returning early and not attempt to 1798 * register video output if cooling device registration failed? 1799 * -- dtor 1800 */ 1801 device->cooling_dev = NULL; 1802 return; 1803 } 1804 1805 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1806 device->cooling_dev->id); 1807 result = sysfs_create_link(&device->dev->dev.kobj, 1808 &device->cooling_dev->device.kobj, 1809 "thermal_cooling"); 1810 if (result) 1811 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1812 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1813 &device->dev->dev.kobj, "device"); 1814 if (result) 1815 printk(KERN_ERR PREFIX "Create sysfs link\n"); 1816 } 1817 1818 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1819 { 1820 struct acpi_video_device *dev; 1821 union acpi_object *levels; 1822 1823 mutex_lock(&video->device_list_lock); 1824 list_for_each_entry(dev, &video->video_device_list, entry) { 1825 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1826 kfree(levels); 1827 } 1828 mutex_unlock(&video->device_list_lock); 1829 } 1830 1831 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1832 { 1833 /* 1834 * Do not create backlight device for video output 1835 * device that is not in the enumerated list. 1836 */ 1837 if (!acpi_video_device_in_dod(dev)) { 1838 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1839 return false; 1840 } 1841 1842 if (only_lcd) 1843 return dev->flags.lcd; 1844 return true; 1845 } 1846 1847 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1848 { 1849 struct acpi_video_device *dev; 1850 1851 if (video->backlight_registered) 1852 return 0; 1853 1854 acpi_video_run_bcl_for_osi(video); 1855 1856 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1857 return 0; 1858 1859 mutex_lock(&video->device_list_lock); 1860 list_for_each_entry(dev, &video->video_device_list, entry) { 1861 if (acpi_video_should_register_backlight(dev)) 1862 acpi_video_dev_register_backlight(dev); 1863 } 1864 mutex_unlock(&video->device_list_lock); 1865 1866 video->backlight_registered = true; 1867 1868 video->pm_nb.notifier_call = acpi_video_resume; 1869 video->pm_nb.priority = 0; 1870 return register_pm_notifier(&video->pm_nb); 1871 } 1872 1873 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1874 { 1875 if (device->backlight) { 1876 backlight_device_unregister(device->backlight); 1877 device->backlight = NULL; 1878 } 1879 if (device->brightness) { 1880 kfree(device->brightness->levels); 1881 kfree(device->brightness); 1882 device->brightness = NULL; 1883 } 1884 if (device->cooling_dev) { 1885 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1886 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1887 thermal_cooling_device_unregister(device->cooling_dev); 1888 device->cooling_dev = NULL; 1889 } 1890 } 1891 1892 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1893 { 1894 struct acpi_video_device *dev; 1895 int error; 1896 1897 if (!video->backlight_registered) 1898 return 0; 1899 1900 error = unregister_pm_notifier(&video->pm_nb); 1901 1902 mutex_lock(&video->device_list_lock); 1903 list_for_each_entry(dev, &video->video_device_list, entry) 1904 acpi_video_dev_unregister_backlight(dev); 1905 mutex_unlock(&video->device_list_lock); 1906 1907 video->backlight_registered = false; 1908 1909 return error; 1910 } 1911 1912 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1913 { 1914 acpi_status status; 1915 struct acpi_device *adev = device->dev; 1916 1917 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1918 acpi_video_device_notify, device); 1919 if (ACPI_FAILURE(status)) 1920 dev_err(&adev->dev, "Error installing notify handler\n"); 1921 else 1922 device->flags.notify = 1; 1923 } 1924 1925 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1926 { 1927 struct input_dev *input; 1928 struct acpi_video_device *dev; 1929 int error; 1930 1931 video->input = input = input_allocate_device(); 1932 if (!input) { 1933 error = -ENOMEM; 1934 goto out; 1935 } 1936 1937 error = acpi_video_bus_start_devices(video); 1938 if (error) 1939 goto err_free_input; 1940 1941 snprintf(video->phys, sizeof(video->phys), 1942 "%s/video/input0", acpi_device_hid(video->device)); 1943 1944 input->name = acpi_device_name(video->device); 1945 input->phys = video->phys; 1946 input->id.bustype = BUS_HOST; 1947 input->id.product = 0x06; 1948 input->dev.parent = &video->device->dev; 1949 input->evbit[0] = BIT(EV_KEY); 1950 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1951 set_bit(KEY_VIDEO_NEXT, input->keybit); 1952 set_bit(KEY_VIDEO_PREV, input->keybit); 1953 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1954 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1955 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1956 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1957 set_bit(KEY_DISPLAY_OFF, input->keybit); 1958 1959 error = input_register_device(input); 1960 if (error) 1961 goto err_stop_dev; 1962 1963 mutex_lock(&video->device_list_lock); 1964 list_for_each_entry(dev, &video->video_device_list, entry) 1965 acpi_video_dev_add_notify_handler(dev); 1966 mutex_unlock(&video->device_list_lock); 1967 1968 return 0; 1969 1970 err_stop_dev: 1971 acpi_video_bus_stop_devices(video); 1972 err_free_input: 1973 input_free_device(input); 1974 video->input = NULL; 1975 out: 1976 return error; 1977 } 1978 1979 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1980 { 1981 if (dev->flags.notify) { 1982 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1983 acpi_video_device_notify); 1984 dev->flags.notify = 0; 1985 } 1986 } 1987 1988 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1989 { 1990 struct acpi_video_device *dev; 1991 1992 mutex_lock(&video->device_list_lock); 1993 list_for_each_entry(dev, &video->video_device_list, entry) 1994 acpi_video_dev_remove_notify_handler(dev); 1995 mutex_unlock(&video->device_list_lock); 1996 1997 acpi_video_bus_stop_devices(video); 1998 input_unregister_device(video->input); 1999 video->input = NULL; 2000 } 2001 2002 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 2003 { 2004 struct acpi_video_device *dev, *next; 2005 2006 mutex_lock(&video->device_list_lock); 2007 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 2008 list_del(&dev->entry); 2009 kfree(dev); 2010 } 2011 mutex_unlock(&video->device_list_lock); 2012 2013 return 0; 2014 } 2015 2016 static int instance; 2017 2018 static int acpi_video_bus_add(struct acpi_device *device) 2019 { 2020 struct acpi_video_bus *video; 2021 int error; 2022 acpi_status status; 2023 2024 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 2025 device->parent->handle, 1, 2026 acpi_video_bus_match, NULL, 2027 device, NULL); 2028 if (status == AE_ALREADY_EXISTS) { 2029 printk(KERN_WARNING FW_BUG 2030 "Duplicate ACPI video bus devices for the" 2031 " same VGA controller, please try module " 2032 "parameter \"video.allow_duplicates=1\"" 2033 "if the current driver doesn't work.\n"); 2034 if (!allow_duplicates) 2035 return -ENODEV; 2036 } 2037 2038 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2039 if (!video) 2040 return -ENOMEM; 2041 2042 /* a hack to fix the duplicate name "VID" problem on T61 */ 2043 if (!strcmp(device->pnp.bus_id, "VID")) { 2044 if (instance) 2045 device->pnp.bus_id[3] = '0' + instance; 2046 instance++; 2047 } 2048 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2049 if (!strcmp(device->pnp.bus_id, "VGA")) { 2050 if (instance) 2051 device->pnp.bus_id[3] = '0' + instance; 2052 instance++; 2053 } 2054 2055 video->device = device; 2056 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2057 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2058 device->driver_data = video; 2059 2060 acpi_video_bus_find_cap(video); 2061 error = acpi_video_bus_check(video); 2062 if (error) 2063 goto err_free_video; 2064 2065 mutex_init(&video->device_list_lock); 2066 INIT_LIST_HEAD(&video->video_device_list); 2067 2068 error = acpi_video_bus_get_devices(video, device); 2069 if (error) 2070 goto err_put_video; 2071 2072 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n", 2073 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2074 video->flags.multihead ? "yes" : "no", 2075 video->flags.rom ? "yes" : "no", 2076 video->flags.post ? "yes" : "no"); 2077 mutex_lock(&video_list_lock); 2078 list_add_tail(&video->entry, &video_bus_head); 2079 mutex_unlock(&video_list_lock); 2080 2081 acpi_video_bus_register_backlight(video); 2082 acpi_video_bus_add_notify_handler(video); 2083 2084 return 0; 2085 2086 err_put_video: 2087 acpi_video_bus_put_devices(video); 2088 kfree(video->attached_array); 2089 err_free_video: 2090 kfree(video); 2091 device->driver_data = NULL; 2092 2093 return error; 2094 } 2095 2096 static int acpi_video_bus_remove(struct acpi_device *device) 2097 { 2098 struct acpi_video_bus *video = NULL; 2099 2100 2101 if (!device || !acpi_driver_data(device)) 2102 return -EINVAL; 2103 2104 video = acpi_driver_data(device); 2105 2106 acpi_video_bus_remove_notify_handler(video); 2107 acpi_video_bus_unregister_backlight(video); 2108 acpi_video_bus_put_devices(video); 2109 2110 mutex_lock(&video_list_lock); 2111 list_del(&video->entry); 2112 mutex_unlock(&video_list_lock); 2113 2114 kfree(video->attached_array); 2115 kfree(video); 2116 2117 return 0; 2118 } 2119 2120 static int __init is_i740(struct pci_dev *dev) 2121 { 2122 if (dev->device == 0x00D1) 2123 return 1; 2124 if (dev->device == 0x7000) 2125 return 1; 2126 return 0; 2127 } 2128 2129 static int __init intel_opregion_present(void) 2130 { 2131 int opregion = 0; 2132 struct pci_dev *dev = NULL; 2133 u32 address; 2134 2135 for_each_pci_dev(dev) { 2136 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2137 continue; 2138 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2139 continue; 2140 /* We don't want to poke around undefined i740 registers */ 2141 if (is_i740(dev)) 2142 continue; 2143 pci_read_config_dword(dev, 0xfc, &address); 2144 if (!address) 2145 continue; 2146 opregion = 1; 2147 } 2148 return opregion; 2149 } 2150 2151 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2152 static bool dmi_is_desktop(void) 2153 { 2154 const char *chassis_type; 2155 unsigned long type; 2156 2157 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2158 if (!chassis_type) 2159 return false; 2160 2161 if (kstrtoul(chassis_type, 10, &type) != 0) 2162 return false; 2163 2164 switch (type) { 2165 case 0x03: /* Desktop */ 2166 case 0x04: /* Low Profile Desktop */ 2167 case 0x05: /* Pizza Box */ 2168 case 0x06: /* Mini Tower */ 2169 case 0x07: /* Tower */ 2170 case 0x10: /* Lunch Box */ 2171 case 0x11: /* Main Server Chassis */ 2172 return true; 2173 } 2174 2175 return false; 2176 } 2177 2178 int acpi_video_register(void) 2179 { 2180 int ret = 0; 2181 2182 mutex_lock(®ister_count_mutex); 2183 if (register_count) { 2184 /* 2185 * if the function of acpi_video_register is already called, 2186 * don't register the acpi_vide_bus again and return no error. 2187 */ 2188 goto leave; 2189 } 2190 2191 /* 2192 * We're seeing a lot of bogus backlight interfaces on newer machines 2193 * without a LCD such as desktops, servers and HDMI sticks. Checking 2194 * the lcd flag fixes this, so enable this on any machines which are 2195 * win8 ready (where we also prefer the native backlight driver, so 2196 * normally the acpi_video code should not register there anyways). 2197 */ 2198 if (only_lcd == -1) { 2199 if (dmi_is_desktop() && acpi_osi_is_win8()) 2200 only_lcd = true; 2201 else 2202 only_lcd = false; 2203 } 2204 2205 dmi_check_system(video_dmi_table); 2206 2207 ret = acpi_bus_register_driver(&acpi_video_bus); 2208 if (ret) 2209 goto leave; 2210 2211 /* 2212 * When the acpi_video_bus is loaded successfully, increase 2213 * the counter reference. 2214 */ 2215 register_count = 1; 2216 2217 leave: 2218 mutex_unlock(®ister_count_mutex); 2219 return ret; 2220 } 2221 EXPORT_SYMBOL(acpi_video_register); 2222 2223 void acpi_video_unregister(void) 2224 { 2225 mutex_lock(®ister_count_mutex); 2226 if (register_count) { 2227 acpi_bus_unregister_driver(&acpi_video_bus); 2228 register_count = 0; 2229 } 2230 mutex_unlock(®ister_count_mutex); 2231 } 2232 EXPORT_SYMBOL(acpi_video_unregister); 2233 2234 void acpi_video_unregister_backlight(void) 2235 { 2236 struct acpi_video_bus *video; 2237 2238 mutex_lock(®ister_count_mutex); 2239 if (register_count) { 2240 mutex_lock(&video_list_lock); 2241 list_for_each_entry(video, &video_bus_head, entry) 2242 acpi_video_bus_unregister_backlight(video); 2243 mutex_unlock(&video_list_lock); 2244 } 2245 mutex_unlock(®ister_count_mutex); 2246 } 2247 2248 bool acpi_video_handles_brightness_key_presses(void) 2249 { 2250 bool have_video_busses; 2251 2252 mutex_lock(&video_list_lock); 2253 have_video_busses = !list_empty(&video_bus_head); 2254 mutex_unlock(&video_list_lock); 2255 2256 return have_video_busses && 2257 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2258 } 2259 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2260 2261 /* 2262 * This is kind of nasty. Hardware using Intel chipsets may require 2263 * the video opregion code to be run first in order to initialise 2264 * state before any ACPI video calls are made. To handle this we defer 2265 * registration of the video class until the opregion code has run. 2266 */ 2267 2268 static int __init acpi_video_init(void) 2269 { 2270 /* 2271 * Let the module load even if ACPI is disabled (e.g. due to 2272 * a broken BIOS) so that i915.ko can still be loaded on such 2273 * old systems without an AcpiOpRegion. 2274 * 2275 * acpi_video_register() will report -ENODEV later as well due 2276 * to acpi_disabled when i915.ko tries to register itself afterwards. 2277 */ 2278 if (acpi_disabled) 2279 return 0; 2280 2281 if (intel_opregion_present()) 2282 return 0; 2283 2284 return acpi_video_register(); 2285 } 2286 2287 static void __exit acpi_video_exit(void) 2288 { 2289 acpi_video_detect_exit(); 2290 acpi_video_unregister(); 2291 2292 return; 2293 } 2294 2295 module_init(acpi_video_init); 2296 module_exit(acpi_video_exit); 2297