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 bool has_backlight; 77 static int register_count; 78 static DEFINE_MUTEX(register_count_mutex); 79 static DEFINE_MUTEX(video_list_lock); 80 static LIST_HEAD(video_bus_head); 81 static int acpi_video_bus_add(struct acpi_device *device); 82 static int acpi_video_bus_remove(struct acpi_device *device); 83 static void acpi_video_bus_notify(struct acpi_device *device, u32 event); 84 void acpi_video_detect_exit(void); 85 86 /* 87 * Indices in the _BCL method response: the first two items are special, 88 * the rest are all supported levels. 89 * 90 * See page 575 of the ACPI spec 3.0 91 */ 92 enum acpi_video_level_idx { 93 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 94 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 95 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 96 }; 97 98 static const struct acpi_device_id video_device_ids[] = { 99 {ACPI_VIDEO_HID, 0}, 100 {"", 0}, 101 }; 102 MODULE_DEVICE_TABLE(acpi, video_device_ids); 103 104 static struct acpi_driver acpi_video_bus = { 105 .name = "video", 106 .class = ACPI_VIDEO_CLASS, 107 .ids = video_device_ids, 108 .ops = { 109 .add = acpi_video_bus_add, 110 .remove = acpi_video_bus_remove, 111 .notify = acpi_video_bus_notify, 112 }, 113 }; 114 115 struct acpi_video_bus_flags { 116 u8 multihead:1; /* can switch video heads */ 117 u8 rom:1; /* can retrieve a video rom */ 118 u8 post:1; /* can configure the head to */ 119 u8 reserved:5; 120 }; 121 122 struct acpi_video_bus_cap { 123 u8 _DOS:1; /* Enable/Disable output switching */ 124 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 125 u8 _ROM:1; /* Get ROM Data */ 126 u8 _GPD:1; /* Get POST Device */ 127 u8 _SPD:1; /* Set POST Device */ 128 u8 _VPO:1; /* Video POST Options */ 129 u8 reserved:2; 130 }; 131 132 struct acpi_video_device_attrib { 133 u32 display_index:4; /* A zero-based instance of the Display */ 134 u32 display_port_attachment:4; /* This field differentiates the display type */ 135 u32 display_type:4; /* Describe the specific type in use */ 136 u32 vendor_specific:4; /* Chipset Vendor Specific */ 137 u32 bios_can_detect:1; /* BIOS can detect the device */ 138 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 139 the VGA device. */ 140 u32 pipe_id:3; /* For VGA multiple-head devices. */ 141 u32 reserved:10; /* Must be 0 */ 142 143 /* 144 * The device ID might not actually follow the scheme described by this 145 * struct acpi_video_device_attrib. If it does, then this bit 146 * device_id_scheme is set; otherwise, other fields should be ignored. 147 * 148 * (but also see the global flag device_id_scheme) 149 */ 150 u32 device_id_scheme:1; 151 }; 152 153 struct acpi_video_enumerated_device { 154 union { 155 u32 int_val; 156 struct acpi_video_device_attrib attrib; 157 } value; 158 struct acpi_video_device *bind_info; 159 }; 160 161 struct acpi_video_bus { 162 struct acpi_device *device; 163 bool backlight_registered; 164 u8 dos_setting; 165 struct acpi_video_enumerated_device *attached_array; 166 u8 attached_count; 167 u8 child_count; 168 struct acpi_video_bus_cap cap; 169 struct acpi_video_bus_flags flags; 170 struct list_head video_device_list; 171 struct mutex device_list_lock; /* protects video_device_list */ 172 struct list_head entry; 173 struct input_dev *input; 174 char phys[32]; /* for input device */ 175 struct notifier_block pm_nb; 176 }; 177 178 struct acpi_video_device_flags { 179 u8 crt:1; 180 u8 lcd:1; 181 u8 tvout:1; 182 u8 dvi:1; 183 u8 bios:1; 184 u8 unknown:1; 185 u8 notify:1; 186 u8 reserved:1; 187 }; 188 189 struct acpi_video_device_cap { 190 u8 _ADR:1; /* Return the unique ID */ 191 u8 _BCL:1; /* Query list of brightness control levels supported */ 192 u8 _BCM:1; /* Set the brightness level */ 193 u8 _BQC:1; /* Get current brightness level */ 194 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 195 u8 _DDC:1; /* Return the EDID for this device */ 196 }; 197 198 struct acpi_video_device { 199 unsigned long device_id; 200 struct acpi_video_device_flags flags; 201 struct acpi_video_device_cap cap; 202 struct list_head entry; 203 struct delayed_work switch_brightness_work; 204 int switch_brightness_event; 205 struct acpi_video_bus *video; 206 struct acpi_device *dev; 207 struct acpi_video_device_brightness *brightness; 208 struct backlight_device *backlight; 209 struct thermal_cooling_device *cooling_dev; 210 }; 211 212 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 213 static void acpi_video_device_rebind(struct acpi_video_bus *video); 214 static void acpi_video_device_bind(struct acpi_video_bus *video, 215 struct acpi_video_device *device); 216 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 217 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 218 int level); 219 static int acpi_video_device_lcd_get_level_current( 220 struct acpi_video_device *device, 221 unsigned long long *level, bool raw); 222 static int acpi_video_get_next_level(struct acpi_video_device *device, 223 u32 level_current, u32 event); 224 static void acpi_video_switch_brightness(struct work_struct *work); 225 226 /* backlight device sysfs support */ 227 static int acpi_video_get_brightness(struct backlight_device *bd) 228 { 229 unsigned long long cur_level; 230 int i; 231 struct acpi_video_device *vd = bl_get_data(bd); 232 233 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 234 return -EINVAL; 235 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 236 if (vd->brightness->levels[i] == cur_level) 237 return i - ACPI_VIDEO_FIRST_LEVEL; 238 } 239 return 0; 240 } 241 242 static int acpi_video_set_brightness(struct backlight_device *bd) 243 { 244 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 245 struct acpi_video_device *vd = bl_get_data(bd); 246 247 cancel_delayed_work(&vd->switch_brightness_work); 248 return acpi_video_device_lcd_set_level(vd, 249 vd->brightness->levels[request_level]); 250 } 251 252 static const struct backlight_ops acpi_backlight_ops = { 253 .get_brightness = acpi_video_get_brightness, 254 .update_status = acpi_video_set_brightness, 255 }; 256 257 /* thermal cooling device callbacks */ 258 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 259 unsigned long *state) 260 { 261 struct acpi_device *device = cooling_dev->devdata; 262 struct acpi_video_device *video = acpi_driver_data(device); 263 264 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 265 return 0; 266 } 267 268 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 269 unsigned long *state) 270 { 271 struct acpi_device *device = cooling_dev->devdata; 272 struct acpi_video_device *video = acpi_driver_data(device); 273 unsigned long long level; 274 int offset; 275 276 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 277 return -EINVAL; 278 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 279 offset++) 280 if (level == video->brightness->levels[offset]) { 281 *state = video->brightness->count - offset - 1; 282 return 0; 283 } 284 285 return -EINVAL; 286 } 287 288 static int 289 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 290 { 291 struct acpi_device *device = cooling_dev->devdata; 292 struct acpi_video_device *video = acpi_driver_data(device); 293 int level; 294 295 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 296 return -EINVAL; 297 298 state = video->brightness->count - state; 299 level = video->brightness->levels[state - 1]; 300 return acpi_video_device_lcd_set_level(video, level); 301 } 302 303 static const struct thermal_cooling_device_ops video_cooling_ops = { 304 .get_max_state = video_get_max_state, 305 .get_cur_state = video_get_cur_state, 306 .set_cur_state = video_set_cur_state, 307 }; 308 309 /* 310 * -------------------------------------------------------------------------- 311 * Video Management 312 * -------------------------------------------------------------------------- 313 */ 314 315 static int 316 acpi_video_device_lcd_query_levels(acpi_handle handle, 317 union acpi_object **levels) 318 { 319 int status; 320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 321 union acpi_object *obj; 322 323 324 *levels = NULL; 325 326 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 327 if (ACPI_FAILURE(status)) 328 return status; 329 obj = (union acpi_object *)buffer.pointer; 330 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 331 acpi_handle_info(handle, "Invalid _BCL data\n"); 332 status = -EFAULT; 333 goto err; 334 } 335 336 *levels = obj; 337 338 return 0; 339 340 err: 341 kfree(buffer.pointer); 342 343 return status; 344 } 345 346 static int 347 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 348 { 349 int status; 350 int state; 351 352 status = acpi_execute_simple_method(device->dev->handle, 353 "_BCM", level); 354 if (ACPI_FAILURE(status)) { 355 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n"); 356 return -EIO; 357 } 358 359 device->brightness->curr = level; 360 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 361 state++) 362 if (level == device->brightness->levels[state]) { 363 if (device->backlight) 364 device->backlight->props.brightness = 365 state - ACPI_VIDEO_FIRST_LEVEL; 366 return 0; 367 } 368 369 acpi_handle_info(device->dev->handle, "Current brightness invalid\n"); 370 return -EINVAL; 371 } 372 373 /* 374 * For some buggy _BQC methods, we need to add a constant value to 375 * the _BQC return value to get the actual current brightness level 376 */ 377 378 static int bqc_offset_aml_bug_workaround; 379 static int video_set_bqc_offset(const struct dmi_system_id *d) 380 { 381 bqc_offset_aml_bug_workaround = 9; 382 return 0; 383 } 384 385 static int video_disable_backlight_sysfs_if( 386 const struct dmi_system_id *d) 387 { 388 if (disable_backlight_sysfs_if == -1) 389 disable_backlight_sysfs_if = 1; 390 return 0; 391 } 392 393 static int video_set_device_id_scheme(const struct dmi_system_id *d) 394 { 395 device_id_scheme = true; 396 return 0; 397 } 398 399 static int video_enable_only_lcd(const struct dmi_system_id *d) 400 { 401 only_lcd = true; 402 return 0; 403 } 404 405 static int video_set_report_key_events(const struct dmi_system_id *id) 406 { 407 if (report_key_events == -1) 408 report_key_events = (uintptr_t)id->driver_data; 409 return 0; 410 } 411 412 static int video_hw_changes_brightness( 413 const struct dmi_system_id *d) 414 { 415 if (hw_changes_brightness == -1) 416 hw_changes_brightness = 1; 417 return 0; 418 } 419 420 static const struct dmi_system_id video_dmi_table[] = { 421 /* 422 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 423 */ 424 { 425 .callback = video_set_bqc_offset, 426 .ident = "Acer Aspire 5720", 427 .matches = { 428 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 429 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 430 }, 431 }, 432 { 433 .callback = video_set_bqc_offset, 434 .ident = "Acer Aspire 5710Z", 435 .matches = { 436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 438 }, 439 }, 440 { 441 .callback = video_set_bqc_offset, 442 .ident = "eMachines E510", 443 .matches = { 444 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 445 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 446 }, 447 }, 448 { 449 .callback = video_set_bqc_offset, 450 .ident = "Acer Aspire 5315", 451 .matches = { 452 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 453 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 454 }, 455 }, 456 { 457 .callback = video_set_bqc_offset, 458 .ident = "Acer Aspire 7720", 459 .matches = { 460 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 461 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 462 }, 463 }, 464 465 /* 466 * Some machines have a broken acpi-video interface for brightness 467 * control, but still need an acpi_video_device_lcd_set_level() call 468 * on resume to turn the backlight power on. We Enable backlight 469 * control on these systems, but do not register a backlight sysfs 470 * as brightness control does not work. 471 */ 472 { 473 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 474 .callback = video_disable_backlight_sysfs_if, 475 .ident = "Toshiba Portege R700", 476 .matches = { 477 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 478 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"), 479 }, 480 }, 481 { 482 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */ 483 .callback = video_disable_backlight_sysfs_if, 484 .ident = "Toshiba Portege R830", 485 .matches = { 486 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 487 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"), 488 }, 489 }, 490 { 491 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ 492 .callback = video_disable_backlight_sysfs_if, 493 .ident = "Toshiba Satellite R830", 494 .matches = { 495 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 496 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"), 497 }, 498 }, 499 /* 500 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 501 * but the IDs actually follow the Device ID Scheme. 502 */ 503 { 504 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 505 .callback = video_set_device_id_scheme, 506 .ident = "ESPRIMO Mobile M9410", 507 .matches = { 508 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 509 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 510 }, 511 }, 512 /* 513 * Some machines have multiple video output devices, but only the one 514 * that is the type of LCD can do the backlight control so we should not 515 * register backlight interface for other video output devices. 516 */ 517 { 518 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 519 .callback = video_enable_only_lcd, 520 .ident = "ESPRIMO Mobile M9410", 521 .matches = { 522 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 523 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 524 }, 525 }, 526 /* 527 * Some machines report wrong key events on the acpi-bus, suppress 528 * key event reporting on these. Note this is only intended to work 529 * around events which are plain wrong. In some cases we get double 530 * events, in this case acpi-video is considered the canonical source 531 * and the events from the other source should be filtered. E.g. 532 * by calling acpi_video_handles_brightness_key_presses() from the 533 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 534 */ 535 { 536 .callback = video_set_report_key_events, 537 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 538 .ident = "Dell Vostro V131", 539 .matches = { 540 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 541 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 542 }, 543 }, 544 { 545 .callback = video_set_report_key_events, 546 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 547 .ident = "Dell Vostro 3350", 548 .matches = { 549 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 550 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), 551 }, 552 }, 553 /* 554 * Some machines change the brightness themselves when a brightness 555 * hotkey gets pressed, despite us telling them not to. In this case 556 * acpi_video_device_notify() should only call backlight_force_update( 557 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 558 */ 559 { 560 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 561 .callback = video_hw_changes_brightness, 562 .ident = "Packard Bell EasyNote MZ35", 563 .matches = { 564 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 565 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 566 }, 567 }, 568 {} 569 }; 570 571 static unsigned long long 572 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 573 unsigned long long bqc_value) 574 { 575 unsigned long long level; 576 577 if (device->brightness->flags._BQC_use_index) { 578 /* 579 * _BQC returns an index that doesn't account for the first 2 580 * items with special meaning (see enum acpi_video_level_idx), 581 * so we need to compensate for that by offsetting ourselves 582 */ 583 if (device->brightness->flags._BCL_reversed) 584 bqc_value = device->brightness->count - 585 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 586 587 level = device->brightness->levels[bqc_value + 588 ACPI_VIDEO_FIRST_LEVEL]; 589 } else { 590 level = bqc_value; 591 } 592 593 level += bqc_offset_aml_bug_workaround; 594 595 return level; 596 } 597 598 static int 599 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 600 unsigned long long *level, bool raw) 601 { 602 acpi_status status = AE_OK; 603 int i; 604 605 if (device->cap._BQC || device->cap._BCQ) { 606 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 607 608 status = acpi_evaluate_integer(device->dev->handle, buf, 609 NULL, level); 610 if (ACPI_SUCCESS(status)) { 611 if (raw) { 612 /* 613 * Caller has indicated he wants the raw 614 * value returned by _BQC, so don't furtherly 615 * mess with the value. 616 */ 617 return 0; 618 } 619 620 *level = acpi_video_bqc_value_to_level(device, *level); 621 622 for (i = ACPI_VIDEO_FIRST_LEVEL; 623 i < device->brightness->count; i++) 624 if (device->brightness->levels[i] == *level) { 625 device->brightness->curr = *level; 626 return 0; 627 } 628 /* 629 * BQC returned an invalid level. 630 * Stop using it. 631 */ 632 acpi_handle_info(device->dev->handle, 633 "%s returned an invalid level", buf); 634 device->cap._BQC = device->cap._BCQ = 0; 635 } else { 636 /* 637 * Fixme: 638 * should we return an error or ignore this failure? 639 * dev->brightness->curr is a cached value which stores 640 * the correct current backlight level in most cases. 641 * ACPI video backlight still works w/ buggy _BQC. 642 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 643 */ 644 acpi_handle_info(device->dev->handle, 645 "%s evaluation failed", buf); 646 device->cap._BQC = device->cap._BCQ = 0; 647 } 648 } 649 650 *level = device->brightness->curr; 651 return 0; 652 } 653 654 static int 655 acpi_video_device_EDID(struct acpi_video_device *device, 656 union acpi_object **edid, ssize_t length) 657 { 658 int status; 659 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 660 union acpi_object *obj; 661 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 662 struct acpi_object_list args = { 1, &arg0 }; 663 664 665 *edid = NULL; 666 667 if (!device) 668 return -ENODEV; 669 if (length == 128) 670 arg0.integer.value = 1; 671 else if (length == 256) 672 arg0.integer.value = 2; 673 else 674 return -EINVAL; 675 676 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 677 if (ACPI_FAILURE(status)) 678 return -ENODEV; 679 680 obj = buffer.pointer; 681 682 if (obj && obj->type == ACPI_TYPE_BUFFER) 683 *edid = obj; 684 else { 685 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); 686 status = -EFAULT; 687 kfree(obj); 688 } 689 690 return status; 691 } 692 693 /* bus */ 694 695 /* 696 * Arg: 697 * video : video bus device pointer 698 * bios_flag : 699 * 0. The system BIOS should NOT automatically switch(toggle) 700 * the active display output. 701 * 1. The system BIOS should automatically switch (toggle) the 702 * active display output. No switch event. 703 * 2. The _DGS value should be locked. 704 * 3. The system BIOS should not automatically switch (toggle) the 705 * active display output, but instead generate the display switch 706 * event notify code. 707 * lcd_flag : 708 * 0. The system BIOS should automatically control the brightness level 709 * of the LCD when: 710 * - the power changes from AC to DC (ACPI appendix B) 711 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 712 * 1. The system BIOS should NOT automatically control the brightness 713 * level of the LCD when: 714 * - the power changes from AC to DC (ACPI appendix B) 715 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 716 * Return Value: 717 * -EINVAL wrong arg. 718 */ 719 720 static int 721 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 722 { 723 acpi_status status; 724 725 if (!video->cap._DOS) 726 return 0; 727 728 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 729 return -EINVAL; 730 video->dos_setting = (lcd_flag << 2) | bios_flag; 731 status = acpi_execute_simple_method(video->device->handle, "_DOS", 732 (lcd_flag << 2) | bios_flag); 733 if (ACPI_FAILURE(status)) 734 return -EIO; 735 736 return 0; 737 } 738 739 /* 740 * Simple comparison function used to sort backlight levels. 741 */ 742 743 static int 744 acpi_video_cmp_level(const void *a, const void *b) 745 { 746 return *(int *)a - *(int *)b; 747 } 748 749 /* 750 * Decides if _BQC/_BCQ for this system is usable 751 * 752 * We do this by changing the level first and then read out the current 753 * brightness level, if the value does not match, find out if it is using 754 * index. If not, clear the _BQC/_BCQ capability. 755 */ 756 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 757 int max_level, int current_level) 758 { 759 struct acpi_video_device_brightness *br = device->brightness; 760 int result; 761 unsigned long long level; 762 int test_level; 763 764 /* don't mess with existing known broken systems */ 765 if (bqc_offset_aml_bug_workaround) 766 return 0; 767 768 /* 769 * Some systems always report current brightness level as maximum 770 * through _BQC, we need to test another value for them. However, 771 * there is a subtlety: 772 * 773 * If the _BCL package ordering is descending, the first level 774 * (br->levels[2]) is likely to be 0, and if the number of levels 775 * matches the number of steps, we might confuse a returned level to 776 * mean the index. 777 * 778 * For example: 779 * 780 * current_level = max_level = 100 781 * test_level = 0 782 * returned level = 100 783 * 784 * In this case 100 means the level, not the index, and _BCM failed. 785 * Still, if the _BCL package ordering is descending, the index of 786 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 787 * 788 * This causes all _BQC calls to return bogus values causing weird 789 * behavior from the user's perspective. For example: 790 * 791 * xbacklight -set 10; xbacklight -set 20; 792 * 793 * would flash to 90% and then slowly down to the desired level (20). 794 * 795 * The solution is simple; test anything other than the first level 796 * (e.g. 1). 797 */ 798 test_level = current_level == max_level 799 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 800 : max_level; 801 802 result = acpi_video_device_lcd_set_level(device, test_level); 803 if (result) 804 return result; 805 806 result = acpi_video_device_lcd_get_level_current(device, &level, true); 807 if (result) 808 return result; 809 810 if (level != test_level) { 811 /* buggy _BQC found, need to find out if it uses index */ 812 if (level < br->count) { 813 if (br->flags._BCL_reversed) 814 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 815 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 816 br->flags._BQC_use_index = 1; 817 } 818 819 if (!br->flags._BQC_use_index) 820 device->cap._BQC = device->cap._BCQ = 0; 821 } 822 823 return 0; 824 } 825 826 int acpi_video_get_levels(struct acpi_device *device, 827 struct acpi_video_device_brightness **dev_br, 828 int *pmax_level) 829 { 830 union acpi_object *obj = NULL; 831 int i, max_level = 0, count = 0, level_ac_battery = 0; 832 union acpi_object *o; 833 struct acpi_video_device_brightness *br = NULL; 834 int result = 0; 835 u32 value; 836 837 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 838 acpi_handle_debug(device->handle, 839 "Could not query available LCD brightness level\n"); 840 result = -ENODEV; 841 goto out; 842 } 843 844 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 845 result = -EINVAL; 846 goto out; 847 } 848 849 br = kzalloc(sizeof(*br), GFP_KERNEL); 850 if (!br) { 851 result = -ENOMEM; 852 goto out; 853 } 854 855 /* 856 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 857 * in order to account for buggy BIOS which don't export the first two 858 * special levels (see below) 859 */ 860 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 861 sizeof(*br->levels), 862 GFP_KERNEL); 863 if (!br->levels) { 864 result = -ENOMEM; 865 goto out_free; 866 } 867 868 for (i = 0; i < obj->package.count; i++) { 869 o = (union acpi_object *)&obj->package.elements[i]; 870 if (o->type != ACPI_TYPE_INTEGER) { 871 acpi_handle_info(device->handle, "Invalid data\n"); 872 continue; 873 } 874 value = (u32) o->integer.value; 875 /* Skip duplicate entries */ 876 if (count > ACPI_VIDEO_FIRST_LEVEL 877 && br->levels[count - 1] == value) 878 continue; 879 880 br->levels[count] = value; 881 882 if (br->levels[count] > max_level) 883 max_level = br->levels[count]; 884 count++; 885 } 886 887 /* 888 * some buggy BIOS don't export the levels 889 * when machine is on AC/Battery in _BCL package. 890 * In this case, the first two elements in _BCL packages 891 * are also supported brightness levels that OS should take care of. 892 */ 893 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 894 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 895 level_ac_battery++; 896 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 897 level_ac_battery++; 898 } 899 900 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 901 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 902 br->flags._BCL_no_ac_battery_levels = 1; 903 for (i = (count - 1 + level_ac_battery); 904 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 905 br->levels[i] = br->levels[i - level_ac_battery]; 906 count += level_ac_battery; 907 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 908 acpi_handle_info(device->handle, 909 "Too many duplicates in _BCL package"); 910 911 /* Check if the _BCL package is in a reversed order */ 912 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 913 br->flags._BCL_reversed = 1; 914 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 915 count - ACPI_VIDEO_FIRST_LEVEL, 916 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 917 acpi_video_cmp_level, NULL); 918 } else if (max_level != br->levels[count - 1]) 919 acpi_handle_info(device->handle, 920 "Found unordered _BCL package"); 921 922 br->count = count; 923 *dev_br = br; 924 if (pmax_level) 925 *pmax_level = max_level; 926 927 out: 928 kfree(obj); 929 return result; 930 out_free: 931 kfree(br); 932 goto out; 933 } 934 EXPORT_SYMBOL(acpi_video_get_levels); 935 936 /* 937 * Arg: 938 * device : video output device (LCD, CRT, ..) 939 * 940 * Return Value: 941 * Maximum brightness level 942 * 943 * Allocate and initialize device->brightness. 944 */ 945 946 static int 947 acpi_video_init_brightness(struct acpi_video_device *device) 948 { 949 int i, max_level = 0; 950 unsigned long long level, level_old; 951 struct acpi_video_device_brightness *br = NULL; 952 int result; 953 954 result = acpi_video_get_levels(device->dev, &br, &max_level); 955 if (result) 956 return result; 957 device->brightness = br; 958 959 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 960 br->curr = level = max_level; 961 962 if (!device->cap._BQC) 963 goto set_level; 964 965 result = acpi_video_device_lcd_get_level_current(device, 966 &level_old, true); 967 if (result) 968 goto out_free_levels; 969 970 result = acpi_video_bqc_quirk(device, max_level, level_old); 971 if (result) 972 goto out_free_levels; 973 /* 974 * cap._BQC may get cleared due to _BQC is found to be broken 975 * in acpi_video_bqc_quirk, so check again here. 976 */ 977 if (!device->cap._BQC) 978 goto set_level; 979 980 level = acpi_video_bqc_value_to_level(device, level_old); 981 /* 982 * On some buggy laptops, _BQC returns an uninitialized 983 * value when invoked for the first time, i.e. 984 * level_old is invalid (no matter whether it's a level 985 * or an index). Set the backlight to max_level in this case. 986 */ 987 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 988 if (level == br->levels[i]) 989 break; 990 if (i == br->count || !level) 991 level = max_level; 992 993 set_level: 994 result = acpi_video_device_lcd_set_level(device, level); 995 if (result) 996 goto out_free_levels; 997 998 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 999 br->count - ACPI_VIDEO_FIRST_LEVEL); 1000 1001 return 0; 1002 1003 out_free_levels: 1004 kfree(br->levels); 1005 kfree(br); 1006 device->brightness = NULL; 1007 return result; 1008 } 1009 1010 /* 1011 * Arg: 1012 * device : video output device (LCD, CRT, ..) 1013 * 1014 * Return Value: 1015 * None 1016 * 1017 * Find out all required AML methods defined under the output 1018 * device. 1019 */ 1020 1021 static void acpi_video_device_find_cap(struct acpi_video_device *device) 1022 { 1023 if (acpi_has_method(device->dev->handle, "_ADR")) 1024 device->cap._ADR = 1; 1025 if (acpi_has_method(device->dev->handle, "_BCL")) 1026 device->cap._BCL = 1; 1027 if (acpi_has_method(device->dev->handle, "_BCM")) 1028 device->cap._BCM = 1; 1029 if (acpi_has_method(device->dev->handle, "_BQC")) { 1030 device->cap._BQC = 1; 1031 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 1032 acpi_handle_info(device->dev->handle, 1033 "_BCQ is used instead of _BQC\n"); 1034 device->cap._BCQ = 1; 1035 } 1036 1037 if (acpi_has_method(device->dev->handle, "_DDC")) 1038 device->cap._DDC = 1; 1039 } 1040 1041 /* 1042 * Arg: 1043 * device : video output device (VGA) 1044 * 1045 * Return Value: 1046 * None 1047 * 1048 * Find out all required AML methods defined under the video bus device. 1049 */ 1050 1051 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1052 { 1053 if (acpi_has_method(video->device->handle, "_DOS")) 1054 video->cap._DOS = 1; 1055 if (acpi_has_method(video->device->handle, "_DOD")) 1056 video->cap._DOD = 1; 1057 if (acpi_has_method(video->device->handle, "_ROM")) 1058 video->cap._ROM = 1; 1059 if (acpi_has_method(video->device->handle, "_GPD")) 1060 video->cap._GPD = 1; 1061 if (acpi_has_method(video->device->handle, "_SPD")) 1062 video->cap._SPD = 1; 1063 if (acpi_has_method(video->device->handle, "_VPO")) 1064 video->cap._VPO = 1; 1065 } 1066 1067 /* 1068 * Check whether the video bus device has required AML method to 1069 * support the desired features 1070 */ 1071 1072 static int acpi_video_bus_check(struct acpi_video_bus *video) 1073 { 1074 acpi_status status = -ENOENT; 1075 struct pci_dev *dev; 1076 1077 if (!video) 1078 return -EINVAL; 1079 1080 dev = acpi_get_pci_dev(video->device->handle); 1081 if (!dev) 1082 return -ENODEV; 1083 pci_dev_put(dev); 1084 1085 /* 1086 * Since there is no HID, CID and so on for VGA driver, we have 1087 * to check well known required nodes. 1088 */ 1089 1090 /* Does this device support video switching? */ 1091 if (video->cap._DOS || video->cap._DOD) { 1092 if (!video->cap._DOS) { 1093 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1094 acpi_device_bid(video->device)); 1095 } 1096 video->flags.multihead = 1; 1097 status = 0; 1098 } 1099 1100 /* Does this device support retrieving a video ROM? */ 1101 if (video->cap._ROM) { 1102 video->flags.rom = 1; 1103 status = 0; 1104 } 1105 1106 /* Does this device support configuring which video device to POST? */ 1107 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1108 video->flags.post = 1; 1109 status = 0; 1110 } 1111 1112 return status; 1113 } 1114 1115 /* 1116 * -------------------------------------------------------------------------- 1117 * Driver Interface 1118 * -------------------------------------------------------------------------- 1119 */ 1120 1121 /* device interface */ 1122 static struct acpi_video_device_attrib * 1123 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1124 { 1125 struct acpi_video_enumerated_device *ids; 1126 int i; 1127 1128 for (i = 0; i < video->attached_count; i++) { 1129 ids = &video->attached_array[i]; 1130 if ((ids->value.int_val & 0xffff) == device_id) 1131 return &ids->value.attrib; 1132 } 1133 1134 return NULL; 1135 } 1136 1137 static int 1138 acpi_video_get_device_type(struct acpi_video_bus *video, 1139 unsigned long device_id) 1140 { 1141 struct acpi_video_enumerated_device *ids; 1142 int i; 1143 1144 for (i = 0; i < video->attached_count; i++) { 1145 ids = &video->attached_array[i]; 1146 if ((ids->value.int_val & 0xffff) == device_id) 1147 return ids->value.int_val; 1148 } 1149 1150 return 0; 1151 } 1152 1153 static int 1154 acpi_video_bus_get_one_device(struct acpi_device *device, 1155 struct acpi_video_bus *video) 1156 { 1157 unsigned long long device_id; 1158 int status, device_type; 1159 struct acpi_video_device *data; 1160 struct acpi_video_device_attrib *attribute; 1161 1162 status = 1163 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1164 /* Some device omits _ADR, we skip them instead of fail */ 1165 if (ACPI_FAILURE(status)) 1166 return 0; 1167 1168 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1169 if (!data) 1170 return -ENOMEM; 1171 1172 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1173 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1174 device->driver_data = data; 1175 1176 data->device_id = device_id; 1177 data->video = video; 1178 data->dev = device; 1179 INIT_DELAYED_WORK(&data->switch_brightness_work, 1180 acpi_video_switch_brightness); 1181 1182 attribute = acpi_video_get_device_attr(video, device_id); 1183 1184 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1185 switch (attribute->display_type) { 1186 case ACPI_VIDEO_DISPLAY_CRT: 1187 data->flags.crt = 1; 1188 break; 1189 case ACPI_VIDEO_DISPLAY_TV: 1190 data->flags.tvout = 1; 1191 break; 1192 case ACPI_VIDEO_DISPLAY_DVI: 1193 data->flags.dvi = 1; 1194 break; 1195 case ACPI_VIDEO_DISPLAY_LCD: 1196 data->flags.lcd = 1; 1197 break; 1198 default: 1199 data->flags.unknown = 1; 1200 break; 1201 } 1202 if (attribute->bios_can_detect) 1203 data->flags.bios = 1; 1204 } else { 1205 /* Check for legacy IDs */ 1206 device_type = acpi_video_get_device_type(video, device_id); 1207 /* Ignore bits 16 and 18-20 */ 1208 switch (device_type & 0xffe2ffff) { 1209 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1210 data->flags.crt = 1; 1211 break; 1212 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1213 data->flags.lcd = 1; 1214 break; 1215 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1216 data->flags.tvout = 1; 1217 break; 1218 default: 1219 data->flags.unknown = 1; 1220 } 1221 } 1222 1223 acpi_video_device_bind(video, data); 1224 acpi_video_device_find_cap(data); 1225 1226 if (data->cap._BCM && data->cap._BCL) 1227 has_backlight = true; 1228 1229 mutex_lock(&video->device_list_lock); 1230 list_add_tail(&data->entry, &video->video_device_list); 1231 mutex_unlock(&video->device_list_lock); 1232 1233 return status; 1234 } 1235 1236 /* 1237 * Arg: 1238 * video : video bus device 1239 * 1240 * Return: 1241 * none 1242 * 1243 * Enumerate the video device list of the video bus, 1244 * bind the ids with the corresponding video devices 1245 * under the video bus. 1246 */ 1247 1248 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1249 { 1250 struct acpi_video_device *dev; 1251 1252 mutex_lock(&video->device_list_lock); 1253 1254 list_for_each_entry(dev, &video->video_device_list, entry) 1255 acpi_video_device_bind(video, dev); 1256 1257 mutex_unlock(&video->device_list_lock); 1258 } 1259 1260 /* 1261 * Arg: 1262 * video : video bus device 1263 * device : video output device under the video 1264 * bus 1265 * 1266 * Return: 1267 * none 1268 * 1269 * Bind the ids with the corresponding video devices 1270 * under the video bus. 1271 */ 1272 1273 static void 1274 acpi_video_device_bind(struct acpi_video_bus *video, 1275 struct acpi_video_device *device) 1276 { 1277 struct acpi_video_enumerated_device *ids; 1278 int i; 1279 1280 for (i = 0; i < video->attached_count; i++) { 1281 ids = &video->attached_array[i]; 1282 if (device->device_id == (ids->value.int_val & 0xffff)) { 1283 ids->bind_info = device; 1284 acpi_handle_debug(video->device->handle, "%s: %d\n", 1285 __func__, i); 1286 } 1287 } 1288 } 1289 1290 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1291 { 1292 struct acpi_video_bus *video = device->video; 1293 int i; 1294 1295 /* 1296 * If we have a broken _DOD or we have more than 8 output devices 1297 * under the graphics controller node that we can't proper deal with 1298 * in the operation region code currently, no need to test. 1299 */ 1300 if (!video->attached_count || video->child_count > 8) 1301 return true; 1302 1303 for (i = 0; i < video->attached_count; i++) { 1304 if ((video->attached_array[i].value.int_val & 0xfff) == 1305 (device->device_id & 0xfff)) 1306 return true; 1307 } 1308 1309 return false; 1310 } 1311 1312 /* 1313 * Arg: 1314 * video : video bus device 1315 * 1316 * Return: 1317 * < 0 : error 1318 * 1319 * Call _DOD to enumerate all devices attached to display adapter 1320 * 1321 */ 1322 1323 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1324 { 1325 int status; 1326 int count; 1327 int i; 1328 struct acpi_video_enumerated_device *active_list; 1329 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1330 union acpi_object *dod = NULL; 1331 union acpi_object *obj; 1332 1333 if (!video->cap._DOD) 1334 return AE_NOT_EXIST; 1335 1336 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1337 if (ACPI_FAILURE(status)) { 1338 acpi_handle_info(video->device->handle, 1339 "_DOD evaluation failed: %s\n", 1340 acpi_format_exception(status)); 1341 return status; 1342 } 1343 1344 dod = buffer.pointer; 1345 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1346 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1347 status = -EFAULT; 1348 goto out; 1349 } 1350 1351 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1352 dod->package.count); 1353 1354 active_list = kcalloc(1 + dod->package.count, 1355 sizeof(struct acpi_video_enumerated_device), 1356 GFP_KERNEL); 1357 if (!active_list) { 1358 status = -ENOMEM; 1359 goto out; 1360 } 1361 1362 count = 0; 1363 for (i = 0; i < dod->package.count; i++) { 1364 obj = &dod->package.elements[i]; 1365 1366 if (obj->type != ACPI_TYPE_INTEGER) { 1367 acpi_handle_info(video->device->handle, 1368 "Invalid _DOD data in element %d\n", i); 1369 continue; 1370 } 1371 1372 active_list[count].value.int_val = obj->integer.value; 1373 active_list[count].bind_info = NULL; 1374 1375 acpi_handle_debug(video->device->handle, 1376 "_DOD element[%d] = %d\n", i, 1377 (int)obj->integer.value); 1378 1379 count++; 1380 } 1381 1382 kfree(video->attached_array); 1383 1384 video->attached_array = active_list; 1385 video->attached_count = count; 1386 1387 out: 1388 kfree(buffer.pointer); 1389 return status; 1390 } 1391 1392 static int 1393 acpi_video_get_next_level(struct acpi_video_device *device, 1394 u32 level_current, u32 event) 1395 { 1396 int min, max, min_above, max_below, i, l, delta = 255; 1397 max = max_below = 0; 1398 min = min_above = 255; 1399 /* Find closest level to level_current */ 1400 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1401 l = device->brightness->levels[i]; 1402 if (abs(l - level_current) < abs(delta)) { 1403 delta = l - level_current; 1404 if (!delta) 1405 break; 1406 } 1407 } 1408 /* Adjust level_current to closest available level */ 1409 level_current += delta; 1410 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1411 l = device->brightness->levels[i]; 1412 if (l < min) 1413 min = l; 1414 if (l > max) 1415 max = l; 1416 if (l < min_above && l > level_current) 1417 min_above = l; 1418 if (l > max_below && l < level_current) 1419 max_below = l; 1420 } 1421 1422 switch (event) { 1423 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1424 return (level_current < max) ? min_above : min; 1425 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1426 return (level_current < max) ? min_above : max; 1427 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1428 return (level_current > min) ? max_below : min; 1429 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1430 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1431 return 0; 1432 default: 1433 return level_current; 1434 } 1435 } 1436 1437 static void 1438 acpi_video_switch_brightness(struct work_struct *work) 1439 { 1440 struct acpi_video_device *device = container_of(to_delayed_work(work), 1441 struct acpi_video_device, switch_brightness_work); 1442 unsigned long long level_current, level_next; 1443 int event = device->switch_brightness_event; 1444 int result = -EINVAL; 1445 1446 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1447 if (!device->backlight) 1448 return; 1449 1450 if (!device->brightness) 1451 goto out; 1452 1453 result = acpi_video_device_lcd_get_level_current(device, 1454 &level_current, 1455 false); 1456 if (result) 1457 goto out; 1458 1459 level_next = acpi_video_get_next_level(device, level_current, event); 1460 1461 result = acpi_video_device_lcd_set_level(device, level_next); 1462 1463 if (!result) 1464 backlight_force_update(device->backlight, 1465 BACKLIGHT_UPDATE_HOTKEY); 1466 1467 out: 1468 if (result) 1469 acpi_handle_info(device->dev->handle, 1470 "Failed to switch brightness\n"); 1471 } 1472 1473 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1474 void **edid) 1475 { 1476 struct acpi_video_bus *video; 1477 struct acpi_video_device *video_device; 1478 union acpi_object *buffer = NULL; 1479 acpi_status status; 1480 int i, length; 1481 1482 if (!device || !acpi_driver_data(device)) 1483 return -EINVAL; 1484 1485 video = acpi_driver_data(device); 1486 1487 for (i = 0; i < video->attached_count; i++) { 1488 video_device = video->attached_array[i].bind_info; 1489 length = 256; 1490 1491 if (!video_device) 1492 continue; 1493 1494 if (!video_device->cap._DDC) 1495 continue; 1496 1497 if (type) { 1498 switch (type) { 1499 case ACPI_VIDEO_DISPLAY_CRT: 1500 if (!video_device->flags.crt) 1501 continue; 1502 break; 1503 case ACPI_VIDEO_DISPLAY_TV: 1504 if (!video_device->flags.tvout) 1505 continue; 1506 break; 1507 case ACPI_VIDEO_DISPLAY_DVI: 1508 if (!video_device->flags.dvi) 1509 continue; 1510 break; 1511 case ACPI_VIDEO_DISPLAY_LCD: 1512 if (!video_device->flags.lcd) 1513 continue; 1514 break; 1515 } 1516 } else if (video_device->device_id != device_id) { 1517 continue; 1518 } 1519 1520 status = acpi_video_device_EDID(video_device, &buffer, length); 1521 1522 if (ACPI_FAILURE(status) || !buffer || 1523 buffer->type != ACPI_TYPE_BUFFER) { 1524 length = 128; 1525 status = acpi_video_device_EDID(video_device, &buffer, 1526 length); 1527 if (ACPI_FAILURE(status) || !buffer || 1528 buffer->type != ACPI_TYPE_BUFFER) { 1529 continue; 1530 } 1531 } 1532 1533 *edid = buffer->buffer.pointer; 1534 return length; 1535 } 1536 1537 return -ENODEV; 1538 } 1539 EXPORT_SYMBOL(acpi_video_get_edid); 1540 1541 static int 1542 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1543 struct acpi_device *device) 1544 { 1545 int status = 0; 1546 struct acpi_device *dev; 1547 1548 /* 1549 * There are systems where video module known to work fine regardless 1550 * of broken _DOD and ignoring returned value here doesn't cause 1551 * any issues later. 1552 */ 1553 acpi_video_device_enumerate(video); 1554 1555 list_for_each_entry(dev, &device->children, node) { 1556 1557 status = acpi_video_bus_get_one_device(dev, video); 1558 if (status) { 1559 dev_err(&dev->dev, "Can't attach device\n"); 1560 break; 1561 } 1562 video->child_count++; 1563 } 1564 return status; 1565 } 1566 1567 /* acpi_video interface */ 1568 1569 /* 1570 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1571 * perform any automatic brightness change on receiving a notification. 1572 */ 1573 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1574 { 1575 return acpi_video_bus_DOS(video, 0, 1576 acpi_osi_is_win8() ? 1 : 0); 1577 } 1578 1579 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1580 { 1581 return acpi_video_bus_DOS(video, 0, 1582 acpi_osi_is_win8() ? 0 : 1); 1583 } 1584 1585 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1586 { 1587 struct acpi_video_bus *video = acpi_driver_data(device); 1588 struct input_dev *input; 1589 int keycode = 0; 1590 1591 if (!video || !video->input) 1592 return; 1593 1594 input = video->input; 1595 1596 switch (event) { 1597 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1598 * most likely via hotkey. */ 1599 keycode = KEY_SWITCHVIDEOMODE; 1600 break; 1601 1602 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1603 * connector. */ 1604 acpi_video_device_enumerate(video); 1605 acpi_video_device_rebind(video); 1606 keycode = KEY_SWITCHVIDEOMODE; 1607 break; 1608 1609 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1610 keycode = KEY_SWITCHVIDEOMODE; 1611 break; 1612 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1613 keycode = KEY_VIDEO_NEXT; 1614 break; 1615 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1616 keycode = KEY_VIDEO_PREV; 1617 break; 1618 1619 default: 1620 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1621 event); 1622 break; 1623 } 1624 1625 if (acpi_notifier_call_chain(device, event, 0)) 1626 /* Something vetoed the keypress. */ 1627 keycode = 0; 1628 1629 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1630 input_report_key(input, keycode, 1); 1631 input_sync(input); 1632 input_report_key(input, keycode, 0); 1633 input_sync(input); 1634 } 1635 } 1636 1637 static void brightness_switch_event(struct acpi_video_device *video_device, 1638 u32 event) 1639 { 1640 if (!brightness_switch_enabled) 1641 return; 1642 1643 video_device->switch_brightness_event = event; 1644 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1645 } 1646 1647 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1648 { 1649 struct acpi_video_device *video_device = data; 1650 struct acpi_device *device = NULL; 1651 struct acpi_video_bus *bus; 1652 struct input_dev *input; 1653 int keycode = 0; 1654 1655 if (!video_device) 1656 return; 1657 1658 device = video_device->dev; 1659 bus = video_device->video; 1660 input = bus->input; 1661 1662 if (hw_changes_brightness > 0) { 1663 if (video_device->backlight) 1664 backlight_force_update(video_device->backlight, 1665 BACKLIGHT_UPDATE_HOTKEY); 1666 acpi_notifier_call_chain(device, event, 0); 1667 return; 1668 } 1669 1670 switch (event) { 1671 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1672 brightness_switch_event(video_device, event); 1673 keycode = KEY_BRIGHTNESS_CYCLE; 1674 break; 1675 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1676 brightness_switch_event(video_device, event); 1677 keycode = KEY_BRIGHTNESSUP; 1678 break; 1679 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1680 brightness_switch_event(video_device, event); 1681 keycode = KEY_BRIGHTNESSDOWN; 1682 break; 1683 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1684 brightness_switch_event(video_device, event); 1685 keycode = KEY_BRIGHTNESS_ZERO; 1686 break; 1687 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1688 brightness_switch_event(video_device, event); 1689 keycode = KEY_DISPLAY_OFF; 1690 break; 1691 default: 1692 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1693 break; 1694 } 1695 1696 acpi_notifier_call_chain(device, event, 0); 1697 1698 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1699 input_report_key(input, keycode, 1); 1700 input_sync(input); 1701 input_report_key(input, keycode, 0); 1702 input_sync(input); 1703 } 1704 } 1705 1706 static int acpi_video_resume(struct notifier_block *nb, 1707 unsigned long val, void *ign) 1708 { 1709 struct acpi_video_bus *video; 1710 struct acpi_video_device *video_device; 1711 int i; 1712 1713 switch (val) { 1714 case PM_POST_HIBERNATION: 1715 case PM_POST_SUSPEND: 1716 case PM_POST_RESTORE: 1717 video = container_of(nb, struct acpi_video_bus, pm_nb); 1718 1719 dev_info(&video->device->dev, "Restoring backlight state\n"); 1720 1721 for (i = 0; i < video->attached_count; i++) { 1722 video_device = video->attached_array[i].bind_info; 1723 if (video_device && video_device->brightness) 1724 acpi_video_device_lcd_set_level(video_device, 1725 video_device->brightness->curr); 1726 } 1727 1728 return NOTIFY_OK; 1729 } 1730 return NOTIFY_DONE; 1731 } 1732 1733 static acpi_status 1734 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1735 void **return_value) 1736 { 1737 struct acpi_device *device = context; 1738 struct acpi_device *sibling; 1739 1740 if (handle == device->handle) 1741 return AE_CTRL_TERMINATE; 1742 1743 sibling = acpi_fetch_acpi_dev(handle); 1744 if (!sibling) 1745 return AE_OK; 1746 1747 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1748 return AE_ALREADY_EXISTS; 1749 1750 return AE_OK; 1751 } 1752 1753 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1754 { 1755 struct backlight_properties props; 1756 struct pci_dev *pdev; 1757 acpi_handle acpi_parent; 1758 struct device *parent = NULL; 1759 int result; 1760 static int count; 1761 char *name; 1762 1763 result = acpi_video_init_brightness(device); 1764 if (result) 1765 return; 1766 1767 if (disable_backlight_sysfs_if > 0) 1768 return; 1769 1770 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1771 if (!name) 1772 return; 1773 count++; 1774 1775 acpi_get_parent(device->dev->handle, &acpi_parent); 1776 1777 pdev = acpi_get_pci_dev(acpi_parent); 1778 if (pdev) { 1779 parent = &pdev->dev; 1780 pci_dev_put(pdev); 1781 } 1782 1783 memset(&props, 0, sizeof(struct backlight_properties)); 1784 props.type = BACKLIGHT_FIRMWARE; 1785 props.max_brightness = 1786 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1787 device->backlight = backlight_device_register(name, 1788 parent, 1789 device, 1790 &acpi_backlight_ops, 1791 &props); 1792 kfree(name); 1793 if (IS_ERR(device->backlight)) { 1794 device->backlight = NULL; 1795 return; 1796 } 1797 1798 /* 1799 * Save current brightness level in case we have to restore it 1800 * before acpi_video_device_lcd_set_level() is called next time. 1801 */ 1802 device->backlight->props.brightness = 1803 acpi_video_get_brightness(device->backlight); 1804 1805 device->cooling_dev = thermal_cooling_device_register("LCD", 1806 device->dev, &video_cooling_ops); 1807 if (IS_ERR(device->cooling_dev)) { 1808 /* 1809 * Set cooling_dev to NULL so we don't crash trying to free it. 1810 * Also, why the hell we are returning early and not attempt to 1811 * register video output if cooling device registration failed? 1812 * -- dtor 1813 */ 1814 device->cooling_dev = NULL; 1815 return; 1816 } 1817 1818 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1819 device->cooling_dev->id); 1820 result = sysfs_create_link(&device->dev->dev.kobj, 1821 &device->cooling_dev->device.kobj, 1822 "thermal_cooling"); 1823 if (result) 1824 pr_info("sysfs link creation failed\n"); 1825 1826 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1827 &device->dev->dev.kobj, "device"); 1828 if (result) 1829 pr_info("Reverse sysfs link creation failed\n"); 1830 } 1831 1832 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1833 { 1834 struct acpi_video_device *dev; 1835 union acpi_object *levels; 1836 1837 mutex_lock(&video->device_list_lock); 1838 list_for_each_entry(dev, &video->video_device_list, entry) { 1839 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1840 kfree(levels); 1841 } 1842 mutex_unlock(&video->device_list_lock); 1843 } 1844 1845 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1846 { 1847 /* 1848 * Do not create backlight device for video output 1849 * device that is not in the enumerated list. 1850 */ 1851 if (!acpi_video_device_in_dod(dev)) { 1852 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1853 return false; 1854 } 1855 1856 if (only_lcd) 1857 return dev->flags.lcd; 1858 return true; 1859 } 1860 1861 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1862 { 1863 struct acpi_video_device *dev; 1864 1865 if (video->backlight_registered) 1866 return 0; 1867 1868 acpi_video_run_bcl_for_osi(video); 1869 1870 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1871 return 0; 1872 1873 mutex_lock(&video->device_list_lock); 1874 list_for_each_entry(dev, &video->video_device_list, entry) { 1875 if (acpi_video_should_register_backlight(dev)) 1876 acpi_video_dev_register_backlight(dev); 1877 } 1878 mutex_unlock(&video->device_list_lock); 1879 1880 video->backlight_registered = true; 1881 1882 video->pm_nb.notifier_call = acpi_video_resume; 1883 video->pm_nb.priority = 0; 1884 return register_pm_notifier(&video->pm_nb); 1885 } 1886 1887 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1888 { 1889 if (device->backlight) { 1890 backlight_device_unregister(device->backlight); 1891 device->backlight = NULL; 1892 } 1893 if (device->brightness) { 1894 kfree(device->brightness->levels); 1895 kfree(device->brightness); 1896 device->brightness = NULL; 1897 } 1898 if (device->cooling_dev) { 1899 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1900 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1901 thermal_cooling_device_unregister(device->cooling_dev); 1902 device->cooling_dev = NULL; 1903 } 1904 } 1905 1906 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1907 { 1908 struct acpi_video_device *dev; 1909 int error; 1910 1911 if (!video->backlight_registered) 1912 return 0; 1913 1914 error = unregister_pm_notifier(&video->pm_nb); 1915 1916 mutex_lock(&video->device_list_lock); 1917 list_for_each_entry(dev, &video->video_device_list, entry) 1918 acpi_video_dev_unregister_backlight(dev); 1919 mutex_unlock(&video->device_list_lock); 1920 1921 video->backlight_registered = false; 1922 1923 return error; 1924 } 1925 1926 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1927 { 1928 acpi_status status; 1929 struct acpi_device *adev = device->dev; 1930 1931 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1932 acpi_video_device_notify, device); 1933 if (ACPI_FAILURE(status)) 1934 dev_err(&adev->dev, "Error installing notify handler\n"); 1935 else 1936 device->flags.notify = 1; 1937 } 1938 1939 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1940 { 1941 struct input_dev *input; 1942 struct acpi_video_device *dev; 1943 int error; 1944 1945 video->input = input = input_allocate_device(); 1946 if (!input) { 1947 error = -ENOMEM; 1948 goto out; 1949 } 1950 1951 error = acpi_video_bus_start_devices(video); 1952 if (error) 1953 goto err_free_input; 1954 1955 snprintf(video->phys, sizeof(video->phys), 1956 "%s/video/input0", acpi_device_hid(video->device)); 1957 1958 input->name = acpi_device_name(video->device); 1959 input->phys = video->phys; 1960 input->id.bustype = BUS_HOST; 1961 input->id.product = 0x06; 1962 input->dev.parent = &video->device->dev; 1963 input->evbit[0] = BIT(EV_KEY); 1964 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1965 set_bit(KEY_VIDEO_NEXT, input->keybit); 1966 set_bit(KEY_VIDEO_PREV, input->keybit); 1967 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1968 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1969 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1970 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1971 set_bit(KEY_DISPLAY_OFF, input->keybit); 1972 1973 error = input_register_device(input); 1974 if (error) 1975 goto err_stop_dev; 1976 1977 mutex_lock(&video->device_list_lock); 1978 list_for_each_entry(dev, &video->video_device_list, entry) 1979 acpi_video_dev_add_notify_handler(dev); 1980 mutex_unlock(&video->device_list_lock); 1981 1982 return 0; 1983 1984 err_stop_dev: 1985 acpi_video_bus_stop_devices(video); 1986 err_free_input: 1987 input_free_device(input); 1988 video->input = NULL; 1989 out: 1990 return error; 1991 } 1992 1993 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1994 { 1995 if (dev->flags.notify) { 1996 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1997 acpi_video_device_notify); 1998 dev->flags.notify = 0; 1999 } 2000 } 2001 2002 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 2003 { 2004 struct acpi_video_device *dev; 2005 2006 mutex_lock(&video->device_list_lock); 2007 list_for_each_entry(dev, &video->video_device_list, entry) 2008 acpi_video_dev_remove_notify_handler(dev); 2009 mutex_unlock(&video->device_list_lock); 2010 2011 acpi_video_bus_stop_devices(video); 2012 input_unregister_device(video->input); 2013 video->input = NULL; 2014 } 2015 2016 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 2017 { 2018 struct acpi_video_device *dev, *next; 2019 2020 mutex_lock(&video->device_list_lock); 2021 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 2022 list_del(&dev->entry); 2023 kfree(dev); 2024 } 2025 mutex_unlock(&video->device_list_lock); 2026 2027 return 0; 2028 } 2029 2030 static int instance; 2031 2032 static int acpi_video_bus_add(struct acpi_device *device) 2033 { 2034 struct acpi_video_bus *video; 2035 int error; 2036 acpi_status status; 2037 2038 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 2039 device->parent->handle, 1, 2040 acpi_video_bus_match, NULL, 2041 device, NULL); 2042 if (status == AE_ALREADY_EXISTS) { 2043 pr_info(FW_BUG 2044 "Duplicate ACPI video bus devices for the" 2045 " same VGA controller, please try module " 2046 "parameter \"video.allow_duplicates=1\"" 2047 "if the current driver doesn't work.\n"); 2048 if (!allow_duplicates) 2049 return -ENODEV; 2050 } 2051 2052 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2053 if (!video) 2054 return -ENOMEM; 2055 2056 /* a hack to fix the duplicate name "VID" problem on T61 */ 2057 if (!strcmp(device->pnp.bus_id, "VID")) { 2058 if (instance) 2059 device->pnp.bus_id[3] = '0' + instance; 2060 instance++; 2061 } 2062 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2063 if (!strcmp(device->pnp.bus_id, "VGA")) { 2064 if (instance) 2065 device->pnp.bus_id[3] = '0' + instance; 2066 instance++; 2067 } 2068 2069 video->device = device; 2070 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2071 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2072 device->driver_data = video; 2073 2074 acpi_video_bus_find_cap(video); 2075 error = acpi_video_bus_check(video); 2076 if (error) 2077 goto err_free_video; 2078 2079 mutex_init(&video->device_list_lock); 2080 INIT_LIST_HEAD(&video->video_device_list); 2081 2082 error = acpi_video_bus_get_devices(video, device); 2083 if (error) 2084 goto err_put_video; 2085 2086 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2087 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2088 video->flags.multihead ? "yes" : "no", 2089 video->flags.rom ? "yes" : "no", 2090 video->flags.post ? "yes" : "no"); 2091 mutex_lock(&video_list_lock); 2092 list_add_tail(&video->entry, &video_bus_head); 2093 mutex_unlock(&video_list_lock); 2094 2095 acpi_video_bus_register_backlight(video); 2096 acpi_video_bus_add_notify_handler(video); 2097 2098 return 0; 2099 2100 err_put_video: 2101 acpi_video_bus_put_devices(video); 2102 kfree(video->attached_array); 2103 err_free_video: 2104 kfree(video); 2105 device->driver_data = NULL; 2106 2107 return error; 2108 } 2109 2110 static int acpi_video_bus_remove(struct acpi_device *device) 2111 { 2112 struct acpi_video_bus *video = NULL; 2113 2114 2115 if (!device || !acpi_driver_data(device)) 2116 return -EINVAL; 2117 2118 video = acpi_driver_data(device); 2119 2120 acpi_video_bus_remove_notify_handler(video); 2121 acpi_video_bus_unregister_backlight(video); 2122 acpi_video_bus_put_devices(video); 2123 2124 mutex_lock(&video_list_lock); 2125 list_del(&video->entry); 2126 mutex_unlock(&video_list_lock); 2127 2128 kfree(video->attached_array); 2129 kfree(video); 2130 2131 return 0; 2132 } 2133 2134 static int __init is_i740(struct pci_dev *dev) 2135 { 2136 if (dev->device == 0x00D1) 2137 return 1; 2138 if (dev->device == 0x7000) 2139 return 1; 2140 return 0; 2141 } 2142 2143 static int __init intel_opregion_present(void) 2144 { 2145 int opregion = 0; 2146 struct pci_dev *dev = NULL; 2147 u32 address; 2148 2149 for_each_pci_dev(dev) { 2150 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2151 continue; 2152 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2153 continue; 2154 /* We don't want to poke around undefined i740 registers */ 2155 if (is_i740(dev)) 2156 continue; 2157 pci_read_config_dword(dev, 0xfc, &address); 2158 if (!address) 2159 continue; 2160 opregion = 1; 2161 } 2162 return opregion; 2163 } 2164 2165 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2166 static bool dmi_is_desktop(void) 2167 { 2168 const char *chassis_type; 2169 unsigned long type; 2170 2171 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2172 if (!chassis_type) 2173 return false; 2174 2175 if (kstrtoul(chassis_type, 10, &type) != 0) 2176 return false; 2177 2178 switch (type) { 2179 case 0x03: /* Desktop */ 2180 case 0x04: /* Low Profile Desktop */ 2181 case 0x05: /* Pizza Box */ 2182 case 0x06: /* Mini Tower */ 2183 case 0x07: /* Tower */ 2184 case 0x10: /* Lunch Box */ 2185 case 0x11: /* Main Server Chassis */ 2186 return true; 2187 } 2188 2189 return false; 2190 } 2191 2192 /* 2193 * We're seeing a lot of bogus backlight interfaces on newer machines 2194 * without a LCD such as desktops, servers and HDMI sticks. Checking the 2195 * lcd flag fixes this, enable this by default on any machines which are: 2196 * 1. Win8 ready (where we also prefer the native backlight driver, so 2197 * normally the acpi_video code should not register there anyways); *and* 2198 * 2.1 Report a desktop/server DMI chassis-type, or 2199 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for 2200 backlight control) 2201 */ 2202 static bool should_check_lcd_flag(void) 2203 { 2204 if (!acpi_osi_is_win8()) 2205 return false; 2206 2207 if (dmi_is_desktop()) 2208 return true; 2209 2210 if (acpi_reduced_hardware()) 2211 return true; 2212 2213 return false; 2214 } 2215 2216 int acpi_video_register(void) 2217 { 2218 int ret = 0; 2219 2220 mutex_lock(®ister_count_mutex); 2221 if (register_count) { 2222 /* 2223 * if the function of acpi_video_register is already called, 2224 * don't register the acpi_video_bus again and return no error. 2225 */ 2226 goto leave; 2227 } 2228 2229 if (only_lcd == -1) 2230 only_lcd = should_check_lcd_flag(); 2231 2232 dmi_check_system(video_dmi_table); 2233 2234 ret = acpi_bus_register_driver(&acpi_video_bus); 2235 if (ret) 2236 goto leave; 2237 2238 /* 2239 * When the acpi_video_bus is loaded successfully, increase 2240 * the counter reference. 2241 */ 2242 register_count = 1; 2243 2244 leave: 2245 mutex_unlock(®ister_count_mutex); 2246 return ret; 2247 } 2248 EXPORT_SYMBOL(acpi_video_register); 2249 2250 void acpi_video_unregister(void) 2251 { 2252 mutex_lock(®ister_count_mutex); 2253 if (register_count) { 2254 acpi_bus_unregister_driver(&acpi_video_bus); 2255 register_count = 0; 2256 has_backlight = false; 2257 } 2258 mutex_unlock(®ister_count_mutex); 2259 } 2260 EXPORT_SYMBOL(acpi_video_unregister); 2261 2262 void acpi_video_unregister_backlight(void) 2263 { 2264 struct acpi_video_bus *video; 2265 2266 mutex_lock(®ister_count_mutex); 2267 if (register_count) { 2268 mutex_lock(&video_list_lock); 2269 list_for_each_entry(video, &video_bus_head, entry) 2270 acpi_video_bus_unregister_backlight(video); 2271 mutex_unlock(&video_list_lock); 2272 } 2273 mutex_unlock(®ister_count_mutex); 2274 } 2275 2276 bool acpi_video_handles_brightness_key_presses(void) 2277 { 2278 return has_backlight && 2279 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2280 } 2281 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2282 2283 /* 2284 * This is kind of nasty. Hardware using Intel chipsets may require 2285 * the video opregion code to be run first in order to initialise 2286 * state before any ACPI video calls are made. To handle this we defer 2287 * registration of the video class until the opregion code has run. 2288 */ 2289 2290 static int __init acpi_video_init(void) 2291 { 2292 /* 2293 * Let the module load even if ACPI is disabled (e.g. due to 2294 * a broken BIOS) so that i915.ko can still be loaded on such 2295 * old systems without an AcpiOpRegion. 2296 * 2297 * acpi_video_register() will report -ENODEV later as well due 2298 * to acpi_disabled when i915.ko tries to register itself afterwards. 2299 */ 2300 if (acpi_disabled) 2301 return 0; 2302 2303 if (intel_opregion_present()) 2304 return 0; 2305 2306 return acpi_video_register(); 2307 } 2308 2309 static void __exit acpi_video_exit(void) 2310 { 2311 acpi_video_detect_exit(); 2312 acpi_video_unregister(); 2313 } 2314 2315 module_init(acpi_video_init); 2316 module_exit(acpi_video_exit); 2317