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 may_report_brightness_keys; 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 .callback = video_disable_backlight_sysfs_if, 501 .ident = "Toshiba Satellite Z830", 502 .matches = { 503 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 504 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Z830"), 505 }, 506 }, 507 { 508 .callback = video_disable_backlight_sysfs_if, 509 .ident = "Toshiba Portege Z830", 510 .matches = { 511 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 512 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE Z830"), 513 }, 514 }, 515 /* 516 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 517 * but the IDs actually follow the Device ID Scheme. 518 */ 519 { 520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 521 .callback = video_set_device_id_scheme, 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 have multiple video output devices, but only the one 530 * that is the type of LCD can do the backlight control so we should not 531 * register backlight interface for other video output devices. 532 */ 533 { 534 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 535 .callback = video_enable_only_lcd, 536 .ident = "ESPRIMO Mobile M9410", 537 .matches = { 538 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 539 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 540 }, 541 }, 542 /* 543 * Some machines report wrong key events on the acpi-bus, suppress 544 * key event reporting on these. Note this is only intended to work 545 * around events which are plain wrong. In some cases we get double 546 * events, in this case acpi-video is considered the canonical source 547 * and the events from the other source should be filtered. E.g. 548 * by calling acpi_video_handles_brightness_key_presses() from the 549 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 550 */ 551 { 552 .callback = video_set_report_key_events, 553 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 554 .ident = "Dell Vostro V131", 555 .matches = { 556 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 557 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 558 }, 559 }, 560 { 561 .callback = video_set_report_key_events, 562 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 563 .ident = "Dell Vostro 3350", 564 .matches = { 565 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 566 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), 567 }, 568 }, 569 /* 570 * Some machines change the brightness themselves when a brightness 571 * hotkey gets pressed, despite us telling them not to. In this case 572 * acpi_video_device_notify() should only call backlight_force_update( 573 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 574 */ 575 { 576 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 577 .callback = video_hw_changes_brightness, 578 .ident = "Packard Bell EasyNote MZ35", 579 .matches = { 580 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 581 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 582 }, 583 }, 584 {} 585 }; 586 587 static unsigned long long 588 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 589 unsigned long long bqc_value) 590 { 591 unsigned long long level; 592 593 if (device->brightness->flags._BQC_use_index) { 594 /* 595 * _BQC returns an index that doesn't account for the first 2 596 * items with special meaning (see enum acpi_video_level_idx), 597 * so we need to compensate for that by offsetting ourselves 598 */ 599 if (device->brightness->flags._BCL_reversed) 600 bqc_value = device->brightness->count - 601 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 602 603 level = device->brightness->levels[bqc_value + 604 ACPI_VIDEO_FIRST_LEVEL]; 605 } else { 606 level = bqc_value; 607 } 608 609 level += bqc_offset_aml_bug_workaround; 610 611 return level; 612 } 613 614 static int 615 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 616 unsigned long long *level, bool raw) 617 { 618 acpi_status status = AE_OK; 619 int i; 620 621 if (device->cap._BQC || device->cap._BCQ) { 622 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 623 624 status = acpi_evaluate_integer(device->dev->handle, buf, 625 NULL, level); 626 if (ACPI_SUCCESS(status)) { 627 if (raw) { 628 /* 629 * Caller has indicated he wants the raw 630 * value returned by _BQC, so don't furtherly 631 * mess with the value. 632 */ 633 return 0; 634 } 635 636 *level = acpi_video_bqc_value_to_level(device, *level); 637 638 for (i = ACPI_VIDEO_FIRST_LEVEL; 639 i < device->brightness->count; i++) 640 if (device->brightness->levels[i] == *level) { 641 device->brightness->curr = *level; 642 return 0; 643 } 644 /* 645 * BQC returned an invalid level. 646 * Stop using it. 647 */ 648 acpi_handle_info(device->dev->handle, 649 "%s returned an invalid level", buf); 650 device->cap._BQC = device->cap._BCQ = 0; 651 } else { 652 /* 653 * Fixme: 654 * should we return an error or ignore this failure? 655 * dev->brightness->curr is a cached value which stores 656 * the correct current backlight level in most cases. 657 * ACPI video backlight still works w/ buggy _BQC. 658 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 659 */ 660 acpi_handle_info(device->dev->handle, 661 "%s evaluation failed", buf); 662 device->cap._BQC = device->cap._BCQ = 0; 663 } 664 } 665 666 *level = device->brightness->curr; 667 return 0; 668 } 669 670 static int 671 acpi_video_device_EDID(struct acpi_video_device *device, 672 union acpi_object **edid, ssize_t length) 673 { 674 int status; 675 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 676 union acpi_object *obj; 677 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 678 struct acpi_object_list args = { 1, &arg0 }; 679 680 681 *edid = NULL; 682 683 if (!device) 684 return -ENODEV; 685 if (length == 128) 686 arg0.integer.value = 1; 687 else if (length == 256) 688 arg0.integer.value = 2; 689 else 690 return -EINVAL; 691 692 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 693 if (ACPI_FAILURE(status)) 694 return -ENODEV; 695 696 obj = buffer.pointer; 697 698 if (obj && obj->type == ACPI_TYPE_BUFFER) 699 *edid = obj; 700 else { 701 acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); 702 status = -EFAULT; 703 kfree(obj); 704 } 705 706 return status; 707 } 708 709 /* bus */ 710 711 /* 712 * Arg: 713 * video : video bus device pointer 714 * bios_flag : 715 * 0. The system BIOS should NOT automatically switch(toggle) 716 * the active display output. 717 * 1. The system BIOS should automatically switch (toggle) the 718 * active display output. No switch event. 719 * 2. The _DGS value should be locked. 720 * 3. The system BIOS should not automatically switch (toggle) the 721 * active display output, but instead generate the display switch 722 * event notify code. 723 * lcd_flag : 724 * 0. The system BIOS should automatically control the brightness level 725 * of the LCD when: 726 * - the power changes from AC to DC (ACPI appendix B) 727 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 728 * 1. The system BIOS should NOT automatically control the brightness 729 * level of the LCD when: 730 * - the power changes from AC to DC (ACPI appendix B) 731 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 732 * Return Value: 733 * -EINVAL wrong arg. 734 */ 735 736 static int 737 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 738 { 739 acpi_status status; 740 741 if (!video->cap._DOS) 742 return 0; 743 744 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 745 return -EINVAL; 746 video->dos_setting = (lcd_flag << 2) | bios_flag; 747 status = acpi_execute_simple_method(video->device->handle, "_DOS", 748 (lcd_flag << 2) | bios_flag); 749 if (ACPI_FAILURE(status)) 750 return -EIO; 751 752 return 0; 753 } 754 755 /* 756 * Simple comparison function used to sort backlight levels. 757 */ 758 759 static int 760 acpi_video_cmp_level(const void *a, const void *b) 761 { 762 return *(int *)a - *(int *)b; 763 } 764 765 /* 766 * Decides if _BQC/_BCQ for this system is usable 767 * 768 * We do this by changing the level first and then read out the current 769 * brightness level, if the value does not match, find out if it is using 770 * index. If not, clear the _BQC/_BCQ capability. 771 */ 772 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 773 int max_level, int current_level) 774 { 775 struct acpi_video_device_brightness *br = device->brightness; 776 int result; 777 unsigned long long level; 778 int test_level; 779 780 /* don't mess with existing known broken systems */ 781 if (bqc_offset_aml_bug_workaround) 782 return 0; 783 784 /* 785 * Some systems always report current brightness level as maximum 786 * through _BQC, we need to test another value for them. However, 787 * there is a subtlety: 788 * 789 * If the _BCL package ordering is descending, the first level 790 * (br->levels[2]) is likely to be 0, and if the number of levels 791 * matches the number of steps, we might confuse a returned level to 792 * mean the index. 793 * 794 * For example: 795 * 796 * current_level = max_level = 100 797 * test_level = 0 798 * returned level = 100 799 * 800 * In this case 100 means the level, not the index, and _BCM failed. 801 * Still, if the _BCL package ordering is descending, the index of 802 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 803 * 804 * This causes all _BQC calls to return bogus values causing weird 805 * behavior from the user's perspective. For example: 806 * 807 * xbacklight -set 10; xbacklight -set 20; 808 * 809 * would flash to 90% and then slowly down to the desired level (20). 810 * 811 * The solution is simple; test anything other than the first level 812 * (e.g. 1). 813 */ 814 test_level = current_level == max_level 815 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 816 : max_level; 817 818 result = acpi_video_device_lcd_set_level(device, test_level); 819 if (result) 820 return result; 821 822 result = acpi_video_device_lcd_get_level_current(device, &level, true); 823 if (result) 824 return result; 825 826 if (level != test_level) { 827 /* buggy _BQC found, need to find out if it uses index */ 828 if (level < br->count) { 829 if (br->flags._BCL_reversed) 830 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 831 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 832 br->flags._BQC_use_index = 1; 833 } 834 835 if (!br->flags._BQC_use_index) 836 device->cap._BQC = device->cap._BCQ = 0; 837 } 838 839 return 0; 840 } 841 842 int acpi_video_get_levels(struct acpi_device *device, 843 struct acpi_video_device_brightness **dev_br, 844 int *pmax_level) 845 { 846 union acpi_object *obj = NULL; 847 int i, max_level = 0, count = 0, level_ac_battery = 0; 848 union acpi_object *o; 849 struct acpi_video_device_brightness *br = NULL; 850 int result = 0; 851 u32 value; 852 853 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 854 acpi_handle_debug(device->handle, 855 "Could not query available LCD brightness level\n"); 856 result = -ENODEV; 857 goto out; 858 } 859 860 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 861 result = -EINVAL; 862 goto out; 863 } 864 865 br = kzalloc(sizeof(*br), GFP_KERNEL); 866 if (!br) { 867 result = -ENOMEM; 868 goto out; 869 } 870 871 /* 872 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 873 * in order to account for buggy BIOS which don't export the first two 874 * special levels (see below) 875 */ 876 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 877 sizeof(*br->levels), 878 GFP_KERNEL); 879 if (!br->levels) { 880 result = -ENOMEM; 881 goto out_free; 882 } 883 884 for (i = 0; i < obj->package.count; i++) { 885 o = (union acpi_object *)&obj->package.elements[i]; 886 if (o->type != ACPI_TYPE_INTEGER) { 887 acpi_handle_info(device->handle, "Invalid data\n"); 888 continue; 889 } 890 value = (u32) o->integer.value; 891 /* Skip duplicate entries */ 892 if (count > ACPI_VIDEO_FIRST_LEVEL 893 && br->levels[count - 1] == value) 894 continue; 895 896 br->levels[count] = value; 897 898 if (br->levels[count] > max_level) 899 max_level = br->levels[count]; 900 count++; 901 } 902 903 /* 904 * some buggy BIOS don't export the levels 905 * when machine is on AC/Battery in _BCL package. 906 * In this case, the first two elements in _BCL packages 907 * are also supported brightness levels that OS should take care of. 908 */ 909 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 910 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 911 level_ac_battery++; 912 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 913 level_ac_battery++; 914 } 915 916 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 917 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 918 br->flags._BCL_no_ac_battery_levels = 1; 919 for (i = (count - 1 + level_ac_battery); 920 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 921 br->levels[i] = br->levels[i - level_ac_battery]; 922 count += level_ac_battery; 923 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 924 acpi_handle_info(device->handle, 925 "Too many duplicates in _BCL package"); 926 927 /* Check if the _BCL package is in a reversed order */ 928 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 929 br->flags._BCL_reversed = 1; 930 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 931 count - ACPI_VIDEO_FIRST_LEVEL, 932 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 933 acpi_video_cmp_level, NULL); 934 } else if (max_level != br->levels[count - 1]) 935 acpi_handle_info(device->handle, 936 "Found unordered _BCL package"); 937 938 br->count = count; 939 *dev_br = br; 940 if (pmax_level) 941 *pmax_level = max_level; 942 943 out: 944 kfree(obj); 945 return result; 946 out_free: 947 kfree(br); 948 goto out; 949 } 950 EXPORT_SYMBOL(acpi_video_get_levels); 951 952 /* 953 * Arg: 954 * device : video output device (LCD, CRT, ..) 955 * 956 * Return Value: 957 * Maximum brightness level 958 * 959 * Allocate and initialize device->brightness. 960 */ 961 962 static int 963 acpi_video_init_brightness(struct acpi_video_device *device) 964 { 965 int i, max_level = 0; 966 unsigned long long level, level_old; 967 struct acpi_video_device_brightness *br = NULL; 968 int result; 969 970 result = acpi_video_get_levels(device->dev, &br, &max_level); 971 if (result) 972 return result; 973 device->brightness = br; 974 975 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 976 br->curr = level = max_level; 977 978 if (!device->cap._BQC) 979 goto set_level; 980 981 result = acpi_video_device_lcd_get_level_current(device, 982 &level_old, true); 983 if (result) 984 goto out_free_levels; 985 986 result = acpi_video_bqc_quirk(device, max_level, level_old); 987 if (result) 988 goto out_free_levels; 989 /* 990 * cap._BQC may get cleared due to _BQC is found to be broken 991 * in acpi_video_bqc_quirk, so check again here. 992 */ 993 if (!device->cap._BQC) 994 goto set_level; 995 996 level = acpi_video_bqc_value_to_level(device, level_old); 997 /* 998 * On some buggy laptops, _BQC returns an uninitialized 999 * value when invoked for the first time, i.e. 1000 * level_old is invalid (no matter whether it's a level 1001 * or an index). Set the backlight to max_level in this case. 1002 */ 1003 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 1004 if (level == br->levels[i]) 1005 break; 1006 if (i == br->count || !level) 1007 level = max_level; 1008 1009 set_level: 1010 result = acpi_video_device_lcd_set_level(device, level); 1011 if (result) 1012 goto out_free_levels; 1013 1014 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 1015 br->count - ACPI_VIDEO_FIRST_LEVEL); 1016 1017 return 0; 1018 1019 out_free_levels: 1020 kfree(br->levels); 1021 kfree(br); 1022 device->brightness = NULL; 1023 return result; 1024 } 1025 1026 /* 1027 * Arg: 1028 * device : video output device (LCD, CRT, ..) 1029 * 1030 * Return Value: 1031 * None 1032 * 1033 * Find out all required AML methods defined under the output 1034 * device. 1035 */ 1036 1037 static void acpi_video_device_find_cap(struct acpi_video_device *device) 1038 { 1039 if (acpi_has_method(device->dev->handle, "_ADR")) 1040 device->cap._ADR = 1; 1041 if (acpi_has_method(device->dev->handle, "_BCL")) 1042 device->cap._BCL = 1; 1043 if (acpi_has_method(device->dev->handle, "_BCM")) 1044 device->cap._BCM = 1; 1045 if (acpi_has_method(device->dev->handle, "_BQC")) { 1046 device->cap._BQC = 1; 1047 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 1048 acpi_handle_info(device->dev->handle, 1049 "_BCQ is used instead of _BQC\n"); 1050 device->cap._BCQ = 1; 1051 } 1052 1053 if (acpi_has_method(device->dev->handle, "_DDC")) 1054 device->cap._DDC = 1; 1055 } 1056 1057 /* 1058 * Arg: 1059 * device : video output device (VGA) 1060 * 1061 * Return Value: 1062 * None 1063 * 1064 * Find out all required AML methods defined under the video bus device. 1065 */ 1066 1067 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1068 { 1069 if (acpi_has_method(video->device->handle, "_DOS")) 1070 video->cap._DOS = 1; 1071 if (acpi_has_method(video->device->handle, "_DOD")) 1072 video->cap._DOD = 1; 1073 if (acpi_has_method(video->device->handle, "_ROM")) 1074 video->cap._ROM = 1; 1075 if (acpi_has_method(video->device->handle, "_GPD")) 1076 video->cap._GPD = 1; 1077 if (acpi_has_method(video->device->handle, "_SPD")) 1078 video->cap._SPD = 1; 1079 if (acpi_has_method(video->device->handle, "_VPO")) 1080 video->cap._VPO = 1; 1081 } 1082 1083 /* 1084 * Check whether the video bus device has required AML method to 1085 * support the desired features 1086 */ 1087 1088 static int acpi_video_bus_check(struct acpi_video_bus *video) 1089 { 1090 acpi_status status = -ENOENT; 1091 struct pci_dev *dev; 1092 1093 if (!video) 1094 return -EINVAL; 1095 1096 dev = acpi_get_pci_dev(video->device->handle); 1097 if (!dev) 1098 return -ENODEV; 1099 pci_dev_put(dev); 1100 1101 /* 1102 * Since there is no HID, CID and so on for VGA driver, we have 1103 * to check well known required nodes. 1104 */ 1105 1106 /* Does this device support video switching? */ 1107 if (video->cap._DOS || video->cap._DOD) { 1108 if (!video->cap._DOS) { 1109 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1110 acpi_device_bid(video->device)); 1111 } 1112 video->flags.multihead = 1; 1113 status = 0; 1114 } 1115 1116 /* Does this device support retrieving a video ROM? */ 1117 if (video->cap._ROM) { 1118 video->flags.rom = 1; 1119 status = 0; 1120 } 1121 1122 /* Does this device support configuring which video device to POST? */ 1123 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1124 video->flags.post = 1; 1125 status = 0; 1126 } 1127 1128 return status; 1129 } 1130 1131 /* 1132 * -------------------------------------------------------------------------- 1133 * Driver Interface 1134 * -------------------------------------------------------------------------- 1135 */ 1136 1137 /* device interface */ 1138 static struct acpi_video_device_attrib * 1139 acpi_video_get_device_attr(struct acpi_video_bus *video, 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.attrib; 1148 } 1149 1150 return NULL; 1151 } 1152 1153 static int 1154 acpi_video_get_device_type(struct acpi_video_bus *video, 1155 unsigned long device_id) 1156 { 1157 struct acpi_video_enumerated_device *ids; 1158 int i; 1159 1160 for (i = 0; i < video->attached_count; i++) { 1161 ids = &video->attached_array[i]; 1162 if ((ids->value.int_val & 0xffff) == device_id) 1163 return ids->value.int_val; 1164 } 1165 1166 return 0; 1167 } 1168 1169 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1170 { 1171 struct acpi_video_bus *video = arg; 1172 struct acpi_video_device_attrib *attribute; 1173 struct acpi_video_device *data; 1174 unsigned long long device_id; 1175 acpi_status status; 1176 int device_type; 1177 1178 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1179 /* Skip devices without _ADR instead of failing. */ 1180 if (ACPI_FAILURE(status)) 1181 goto exit; 1182 1183 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1184 if (!data) { 1185 dev_dbg(&device->dev, "Cannot attach\n"); 1186 return -ENOMEM; 1187 } 1188 1189 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1190 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1191 device->driver_data = data; 1192 1193 data->device_id = device_id; 1194 data->video = video; 1195 data->dev = device; 1196 INIT_DELAYED_WORK(&data->switch_brightness_work, 1197 acpi_video_switch_brightness); 1198 1199 attribute = acpi_video_get_device_attr(video, device_id); 1200 1201 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1202 switch (attribute->display_type) { 1203 case ACPI_VIDEO_DISPLAY_CRT: 1204 data->flags.crt = 1; 1205 break; 1206 case ACPI_VIDEO_DISPLAY_TV: 1207 data->flags.tvout = 1; 1208 break; 1209 case ACPI_VIDEO_DISPLAY_DVI: 1210 data->flags.dvi = 1; 1211 break; 1212 case ACPI_VIDEO_DISPLAY_LCD: 1213 data->flags.lcd = 1; 1214 break; 1215 default: 1216 data->flags.unknown = 1; 1217 break; 1218 } 1219 if (attribute->bios_can_detect) 1220 data->flags.bios = 1; 1221 } else { 1222 /* Check for legacy IDs */ 1223 device_type = acpi_video_get_device_type(video, device_id); 1224 /* Ignore bits 16 and 18-20 */ 1225 switch (device_type & 0xffe2ffff) { 1226 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1227 data->flags.crt = 1; 1228 break; 1229 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1230 data->flags.lcd = 1; 1231 break; 1232 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1233 data->flags.tvout = 1; 1234 break; 1235 default: 1236 data->flags.unknown = 1; 1237 } 1238 } 1239 1240 acpi_video_device_bind(video, data); 1241 acpi_video_device_find_cap(data); 1242 1243 if (data->cap._BCM && data->cap._BCL) 1244 may_report_brightness_keys = true; 1245 1246 mutex_lock(&video->device_list_lock); 1247 list_add_tail(&data->entry, &video->video_device_list); 1248 mutex_unlock(&video->device_list_lock); 1249 1250 exit: 1251 video->child_count++; 1252 return 0; 1253 } 1254 1255 /* 1256 * Arg: 1257 * video : video bus device 1258 * 1259 * Return: 1260 * none 1261 * 1262 * Enumerate the video device list of the video bus, 1263 * bind the ids with the corresponding video devices 1264 * under the video bus. 1265 */ 1266 1267 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1268 { 1269 struct acpi_video_device *dev; 1270 1271 mutex_lock(&video->device_list_lock); 1272 1273 list_for_each_entry(dev, &video->video_device_list, entry) 1274 acpi_video_device_bind(video, dev); 1275 1276 mutex_unlock(&video->device_list_lock); 1277 } 1278 1279 /* 1280 * Arg: 1281 * video : video bus device 1282 * device : video output device under the video 1283 * bus 1284 * 1285 * Return: 1286 * none 1287 * 1288 * Bind the ids with the corresponding video devices 1289 * under the video bus. 1290 */ 1291 1292 static void 1293 acpi_video_device_bind(struct acpi_video_bus *video, 1294 struct acpi_video_device *device) 1295 { 1296 struct acpi_video_enumerated_device *ids; 1297 int i; 1298 1299 for (i = 0; i < video->attached_count; i++) { 1300 ids = &video->attached_array[i]; 1301 if (device->device_id == (ids->value.int_val & 0xffff)) { 1302 ids->bind_info = device; 1303 acpi_handle_debug(video->device->handle, "%s: %d\n", 1304 __func__, i); 1305 } 1306 } 1307 } 1308 1309 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1310 { 1311 struct acpi_video_bus *video = device->video; 1312 int i; 1313 1314 /* 1315 * If we have a broken _DOD or we have more than 8 output devices 1316 * under the graphics controller node that we can't proper deal with 1317 * in the operation region code currently, no need to test. 1318 */ 1319 if (!video->attached_count || video->child_count > 8) 1320 return true; 1321 1322 for (i = 0; i < video->attached_count; i++) { 1323 if ((video->attached_array[i].value.int_val & 0xfff) == 1324 (device->device_id & 0xfff)) 1325 return true; 1326 } 1327 1328 return false; 1329 } 1330 1331 /* 1332 * Arg: 1333 * video : video bus device 1334 * 1335 * Return: 1336 * < 0 : error 1337 * 1338 * Call _DOD to enumerate all devices attached to display adapter 1339 * 1340 */ 1341 1342 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1343 { 1344 int status; 1345 int count; 1346 int i; 1347 struct acpi_video_enumerated_device *active_list; 1348 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1349 union acpi_object *dod = NULL; 1350 union acpi_object *obj; 1351 1352 if (!video->cap._DOD) 1353 return AE_NOT_EXIST; 1354 1355 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1356 if (ACPI_FAILURE(status)) { 1357 acpi_handle_info(video->device->handle, 1358 "_DOD evaluation failed: %s\n", 1359 acpi_format_exception(status)); 1360 return status; 1361 } 1362 1363 dod = buffer.pointer; 1364 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1365 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1366 status = -EFAULT; 1367 goto out; 1368 } 1369 1370 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1371 dod->package.count); 1372 1373 active_list = kcalloc(1 + dod->package.count, 1374 sizeof(struct acpi_video_enumerated_device), 1375 GFP_KERNEL); 1376 if (!active_list) { 1377 status = -ENOMEM; 1378 goto out; 1379 } 1380 1381 count = 0; 1382 for (i = 0; i < dod->package.count; i++) { 1383 obj = &dod->package.elements[i]; 1384 1385 if (obj->type != ACPI_TYPE_INTEGER) { 1386 acpi_handle_info(video->device->handle, 1387 "Invalid _DOD data in element %d\n", i); 1388 continue; 1389 } 1390 1391 active_list[count].value.int_val = obj->integer.value; 1392 active_list[count].bind_info = NULL; 1393 1394 acpi_handle_debug(video->device->handle, 1395 "_DOD element[%d] = %d\n", i, 1396 (int)obj->integer.value); 1397 1398 count++; 1399 } 1400 1401 kfree(video->attached_array); 1402 1403 video->attached_array = active_list; 1404 video->attached_count = count; 1405 1406 out: 1407 kfree(buffer.pointer); 1408 return status; 1409 } 1410 1411 static int 1412 acpi_video_get_next_level(struct acpi_video_device *device, 1413 u32 level_current, u32 event) 1414 { 1415 int min, max, min_above, max_below, i, l, delta = 255; 1416 max = max_below = 0; 1417 min = min_above = 255; 1418 /* Find closest level to level_current */ 1419 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1420 l = device->brightness->levels[i]; 1421 if (abs(l - level_current) < abs(delta)) { 1422 delta = l - level_current; 1423 if (!delta) 1424 break; 1425 } 1426 } 1427 /* Adjust level_current to closest available level */ 1428 level_current += delta; 1429 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1430 l = device->brightness->levels[i]; 1431 if (l < min) 1432 min = l; 1433 if (l > max) 1434 max = l; 1435 if (l < min_above && l > level_current) 1436 min_above = l; 1437 if (l > max_below && l < level_current) 1438 max_below = l; 1439 } 1440 1441 switch (event) { 1442 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1443 return (level_current < max) ? min_above : min; 1444 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1445 return (level_current < max) ? min_above : max; 1446 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1447 return (level_current > min) ? max_below : min; 1448 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1449 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1450 return 0; 1451 default: 1452 return level_current; 1453 } 1454 } 1455 1456 static void 1457 acpi_video_switch_brightness(struct work_struct *work) 1458 { 1459 struct acpi_video_device *device = container_of(to_delayed_work(work), 1460 struct acpi_video_device, switch_brightness_work); 1461 unsigned long long level_current, level_next; 1462 int event = device->switch_brightness_event; 1463 int result = -EINVAL; 1464 1465 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1466 if (!device->backlight) 1467 return; 1468 1469 if (!device->brightness) 1470 goto out; 1471 1472 result = acpi_video_device_lcd_get_level_current(device, 1473 &level_current, 1474 false); 1475 if (result) 1476 goto out; 1477 1478 level_next = acpi_video_get_next_level(device, level_current, event); 1479 1480 result = acpi_video_device_lcd_set_level(device, level_next); 1481 1482 if (!result) 1483 backlight_force_update(device->backlight, 1484 BACKLIGHT_UPDATE_HOTKEY); 1485 1486 out: 1487 if (result) 1488 acpi_handle_info(device->dev->handle, 1489 "Failed to switch brightness\n"); 1490 } 1491 1492 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1493 void **edid) 1494 { 1495 struct acpi_video_bus *video; 1496 struct acpi_video_device *video_device; 1497 union acpi_object *buffer = NULL; 1498 acpi_status status; 1499 int i, length; 1500 1501 if (!device || !acpi_driver_data(device)) 1502 return -EINVAL; 1503 1504 video = acpi_driver_data(device); 1505 1506 for (i = 0; i < video->attached_count; i++) { 1507 video_device = video->attached_array[i].bind_info; 1508 length = 256; 1509 1510 if (!video_device) 1511 continue; 1512 1513 if (!video_device->cap._DDC) 1514 continue; 1515 1516 if (type) { 1517 switch (type) { 1518 case ACPI_VIDEO_DISPLAY_CRT: 1519 if (!video_device->flags.crt) 1520 continue; 1521 break; 1522 case ACPI_VIDEO_DISPLAY_TV: 1523 if (!video_device->flags.tvout) 1524 continue; 1525 break; 1526 case ACPI_VIDEO_DISPLAY_DVI: 1527 if (!video_device->flags.dvi) 1528 continue; 1529 break; 1530 case ACPI_VIDEO_DISPLAY_LCD: 1531 if (!video_device->flags.lcd) 1532 continue; 1533 break; 1534 } 1535 } else if (video_device->device_id != device_id) { 1536 continue; 1537 } 1538 1539 status = acpi_video_device_EDID(video_device, &buffer, length); 1540 1541 if (ACPI_FAILURE(status) || !buffer || 1542 buffer->type != ACPI_TYPE_BUFFER) { 1543 length = 128; 1544 status = acpi_video_device_EDID(video_device, &buffer, 1545 length); 1546 if (ACPI_FAILURE(status) || !buffer || 1547 buffer->type != ACPI_TYPE_BUFFER) { 1548 continue; 1549 } 1550 } 1551 1552 *edid = buffer->buffer.pointer; 1553 return length; 1554 } 1555 1556 return -ENODEV; 1557 } 1558 EXPORT_SYMBOL(acpi_video_get_edid); 1559 1560 static int 1561 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1562 struct acpi_device *device) 1563 { 1564 /* 1565 * There are systems where video module known to work fine regardless 1566 * of broken _DOD and ignoring returned value here doesn't cause 1567 * any issues later. 1568 */ 1569 acpi_video_device_enumerate(video); 1570 1571 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1572 } 1573 1574 /* acpi_video interface */ 1575 1576 /* 1577 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1578 * perform any automatic brightness change on receiving a notification. 1579 */ 1580 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1581 { 1582 return acpi_video_bus_DOS(video, 0, 1583 acpi_osi_is_win8() ? 1 : 0); 1584 } 1585 1586 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1587 { 1588 return acpi_video_bus_DOS(video, 0, 1589 acpi_osi_is_win8() ? 0 : 1); 1590 } 1591 1592 static void acpi_video_bus_notify(struct acpi_device *device, u32 event) 1593 { 1594 struct acpi_video_bus *video = acpi_driver_data(device); 1595 struct input_dev *input; 1596 int keycode = 0; 1597 1598 if (!video || !video->input) 1599 return; 1600 1601 input = video->input; 1602 1603 switch (event) { 1604 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1605 * most likely via hotkey. */ 1606 keycode = KEY_SWITCHVIDEOMODE; 1607 break; 1608 1609 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1610 * connector. */ 1611 acpi_video_device_enumerate(video); 1612 acpi_video_device_rebind(video); 1613 keycode = KEY_SWITCHVIDEOMODE; 1614 break; 1615 1616 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1617 keycode = KEY_SWITCHVIDEOMODE; 1618 break; 1619 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1620 keycode = KEY_VIDEO_NEXT; 1621 break; 1622 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1623 keycode = KEY_VIDEO_PREV; 1624 break; 1625 1626 default: 1627 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1628 event); 1629 break; 1630 } 1631 1632 if (acpi_notifier_call_chain(device, event, 0)) 1633 /* Something vetoed the keypress. */ 1634 keycode = 0; 1635 1636 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1637 input_report_key(input, keycode, 1); 1638 input_sync(input); 1639 input_report_key(input, keycode, 0); 1640 input_sync(input); 1641 } 1642 } 1643 1644 static void brightness_switch_event(struct acpi_video_device *video_device, 1645 u32 event) 1646 { 1647 if (!brightness_switch_enabled) 1648 return; 1649 1650 video_device->switch_brightness_event = event; 1651 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1652 } 1653 1654 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1655 { 1656 struct acpi_video_device *video_device = data; 1657 struct acpi_device *device = NULL; 1658 struct acpi_video_bus *bus; 1659 struct input_dev *input; 1660 int keycode = 0; 1661 1662 if (!video_device) 1663 return; 1664 1665 device = video_device->dev; 1666 bus = video_device->video; 1667 input = bus->input; 1668 1669 if (hw_changes_brightness > 0) { 1670 if (video_device->backlight) 1671 backlight_force_update(video_device->backlight, 1672 BACKLIGHT_UPDATE_HOTKEY); 1673 acpi_notifier_call_chain(device, event, 0); 1674 return; 1675 } 1676 1677 switch (event) { 1678 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1679 brightness_switch_event(video_device, event); 1680 keycode = KEY_BRIGHTNESS_CYCLE; 1681 break; 1682 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1683 brightness_switch_event(video_device, event); 1684 keycode = KEY_BRIGHTNESSUP; 1685 break; 1686 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1687 brightness_switch_event(video_device, event); 1688 keycode = KEY_BRIGHTNESSDOWN; 1689 break; 1690 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1691 brightness_switch_event(video_device, event); 1692 keycode = KEY_BRIGHTNESS_ZERO; 1693 break; 1694 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1695 brightness_switch_event(video_device, event); 1696 keycode = KEY_DISPLAY_OFF; 1697 break; 1698 default: 1699 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1700 break; 1701 } 1702 1703 if (keycode) 1704 may_report_brightness_keys = true; 1705 1706 acpi_notifier_call_chain(device, event, 0); 1707 1708 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1709 input_report_key(input, keycode, 1); 1710 input_sync(input); 1711 input_report_key(input, keycode, 0); 1712 input_sync(input); 1713 } 1714 } 1715 1716 static int acpi_video_resume(struct notifier_block *nb, 1717 unsigned long val, void *ign) 1718 { 1719 struct acpi_video_bus *video; 1720 struct acpi_video_device *video_device; 1721 int i; 1722 1723 switch (val) { 1724 case PM_POST_HIBERNATION: 1725 case PM_POST_SUSPEND: 1726 case PM_POST_RESTORE: 1727 video = container_of(nb, struct acpi_video_bus, pm_nb); 1728 1729 dev_info(&video->device->dev, "Restoring backlight state\n"); 1730 1731 for (i = 0; i < video->attached_count; i++) { 1732 video_device = video->attached_array[i].bind_info; 1733 if (video_device && video_device->brightness) 1734 acpi_video_device_lcd_set_level(video_device, 1735 video_device->brightness->curr); 1736 } 1737 1738 return NOTIFY_OK; 1739 } 1740 return NOTIFY_DONE; 1741 } 1742 1743 static acpi_status 1744 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1745 void **return_value) 1746 { 1747 struct acpi_device *device = context; 1748 struct acpi_device *sibling; 1749 1750 if (handle == device->handle) 1751 return AE_CTRL_TERMINATE; 1752 1753 sibling = acpi_fetch_acpi_dev(handle); 1754 if (!sibling) 1755 return AE_OK; 1756 1757 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1758 return AE_ALREADY_EXISTS; 1759 1760 return AE_OK; 1761 } 1762 1763 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1764 { 1765 struct backlight_properties props; 1766 struct pci_dev *pdev; 1767 acpi_handle acpi_parent; 1768 struct device *parent = NULL; 1769 int result; 1770 static int count; 1771 char *name; 1772 1773 result = acpi_video_init_brightness(device); 1774 if (result) 1775 return; 1776 1777 if (disable_backlight_sysfs_if > 0) 1778 return; 1779 1780 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1781 if (!name) 1782 return; 1783 count++; 1784 1785 acpi_get_parent(device->dev->handle, &acpi_parent); 1786 1787 pdev = acpi_get_pci_dev(acpi_parent); 1788 if (pdev) { 1789 parent = &pdev->dev; 1790 pci_dev_put(pdev); 1791 } 1792 1793 memset(&props, 0, sizeof(struct backlight_properties)); 1794 props.type = BACKLIGHT_FIRMWARE; 1795 props.max_brightness = 1796 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1797 device->backlight = backlight_device_register(name, 1798 parent, 1799 device, 1800 &acpi_backlight_ops, 1801 &props); 1802 kfree(name); 1803 if (IS_ERR(device->backlight)) { 1804 device->backlight = NULL; 1805 return; 1806 } 1807 1808 /* 1809 * Save current brightness level in case we have to restore it 1810 * before acpi_video_device_lcd_set_level() is called next time. 1811 */ 1812 device->backlight->props.brightness = 1813 acpi_video_get_brightness(device->backlight); 1814 1815 device->cooling_dev = thermal_cooling_device_register("LCD", 1816 device->dev, &video_cooling_ops); 1817 if (IS_ERR(device->cooling_dev)) { 1818 /* 1819 * Set cooling_dev to NULL so we don't crash trying to free it. 1820 * Also, why the hell we are returning early and not attempt to 1821 * register video output if cooling device registration failed? 1822 * -- dtor 1823 */ 1824 device->cooling_dev = NULL; 1825 return; 1826 } 1827 1828 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1829 device->cooling_dev->id); 1830 result = sysfs_create_link(&device->dev->dev.kobj, 1831 &device->cooling_dev->device.kobj, 1832 "thermal_cooling"); 1833 if (result) 1834 pr_info("sysfs link creation failed\n"); 1835 1836 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1837 &device->dev->dev.kobj, "device"); 1838 if (result) 1839 pr_info("Reverse sysfs link creation failed\n"); 1840 } 1841 1842 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1843 { 1844 struct acpi_video_device *dev; 1845 union acpi_object *levels; 1846 1847 mutex_lock(&video->device_list_lock); 1848 list_for_each_entry(dev, &video->video_device_list, entry) { 1849 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1850 kfree(levels); 1851 } 1852 mutex_unlock(&video->device_list_lock); 1853 } 1854 1855 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1856 { 1857 /* 1858 * Do not create backlight device for video output 1859 * device that is not in the enumerated list. 1860 */ 1861 if (!acpi_video_device_in_dod(dev)) { 1862 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1863 return false; 1864 } 1865 1866 if (only_lcd) 1867 return dev->flags.lcd; 1868 return true; 1869 } 1870 1871 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1872 { 1873 struct acpi_video_device *dev; 1874 1875 if (video->backlight_registered) 1876 return 0; 1877 1878 acpi_video_run_bcl_for_osi(video); 1879 1880 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1881 return 0; 1882 1883 mutex_lock(&video->device_list_lock); 1884 list_for_each_entry(dev, &video->video_device_list, entry) { 1885 if (acpi_video_should_register_backlight(dev)) 1886 acpi_video_dev_register_backlight(dev); 1887 } 1888 mutex_unlock(&video->device_list_lock); 1889 1890 video->backlight_registered = true; 1891 1892 video->pm_nb.notifier_call = acpi_video_resume; 1893 video->pm_nb.priority = 0; 1894 return register_pm_notifier(&video->pm_nb); 1895 } 1896 1897 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1898 { 1899 if (device->backlight) { 1900 backlight_device_unregister(device->backlight); 1901 device->backlight = NULL; 1902 } 1903 if (device->brightness) { 1904 kfree(device->brightness->levels); 1905 kfree(device->brightness); 1906 device->brightness = NULL; 1907 } 1908 if (device->cooling_dev) { 1909 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1910 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1911 thermal_cooling_device_unregister(device->cooling_dev); 1912 device->cooling_dev = NULL; 1913 } 1914 } 1915 1916 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1917 { 1918 struct acpi_video_device *dev; 1919 int error; 1920 1921 if (!video->backlight_registered) 1922 return 0; 1923 1924 error = unregister_pm_notifier(&video->pm_nb); 1925 1926 mutex_lock(&video->device_list_lock); 1927 list_for_each_entry(dev, &video->video_device_list, entry) 1928 acpi_video_dev_unregister_backlight(dev); 1929 mutex_unlock(&video->device_list_lock); 1930 1931 video->backlight_registered = false; 1932 1933 return error; 1934 } 1935 1936 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1937 { 1938 acpi_status status; 1939 struct acpi_device *adev = device->dev; 1940 1941 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1942 acpi_video_device_notify, device); 1943 if (ACPI_FAILURE(status)) 1944 dev_err(&adev->dev, "Error installing notify handler\n"); 1945 else 1946 device->flags.notify = 1; 1947 } 1948 1949 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1950 { 1951 struct input_dev *input; 1952 struct acpi_video_device *dev; 1953 int error; 1954 1955 video->input = input = input_allocate_device(); 1956 if (!input) { 1957 error = -ENOMEM; 1958 goto out; 1959 } 1960 1961 error = acpi_video_bus_start_devices(video); 1962 if (error) 1963 goto err_free_input; 1964 1965 snprintf(video->phys, sizeof(video->phys), 1966 "%s/video/input0", acpi_device_hid(video->device)); 1967 1968 input->name = acpi_device_name(video->device); 1969 input->phys = video->phys; 1970 input->id.bustype = BUS_HOST; 1971 input->id.product = 0x06; 1972 input->dev.parent = &video->device->dev; 1973 input->evbit[0] = BIT(EV_KEY); 1974 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1975 set_bit(KEY_VIDEO_NEXT, input->keybit); 1976 set_bit(KEY_VIDEO_PREV, input->keybit); 1977 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1978 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1979 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1980 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1981 set_bit(KEY_DISPLAY_OFF, input->keybit); 1982 1983 error = input_register_device(input); 1984 if (error) 1985 goto err_stop_dev; 1986 1987 mutex_lock(&video->device_list_lock); 1988 list_for_each_entry(dev, &video->video_device_list, entry) 1989 acpi_video_dev_add_notify_handler(dev); 1990 mutex_unlock(&video->device_list_lock); 1991 1992 return 0; 1993 1994 err_stop_dev: 1995 acpi_video_bus_stop_devices(video); 1996 err_free_input: 1997 input_free_device(input); 1998 video->input = NULL; 1999 out: 2000 return error; 2001 } 2002 2003 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 2004 { 2005 if (dev->flags.notify) { 2006 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 2007 acpi_video_device_notify); 2008 dev->flags.notify = 0; 2009 } 2010 } 2011 2012 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 2013 { 2014 struct acpi_video_device *dev; 2015 2016 mutex_lock(&video->device_list_lock); 2017 list_for_each_entry(dev, &video->video_device_list, entry) 2018 acpi_video_dev_remove_notify_handler(dev); 2019 mutex_unlock(&video->device_list_lock); 2020 2021 acpi_video_bus_stop_devices(video); 2022 input_unregister_device(video->input); 2023 video->input = NULL; 2024 } 2025 2026 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 2027 { 2028 struct acpi_video_device *dev, *next; 2029 2030 mutex_lock(&video->device_list_lock); 2031 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 2032 list_del(&dev->entry); 2033 kfree(dev); 2034 } 2035 mutex_unlock(&video->device_list_lock); 2036 2037 return 0; 2038 } 2039 2040 static int instance; 2041 2042 static int acpi_video_bus_add(struct acpi_device *device) 2043 { 2044 struct acpi_video_bus *video; 2045 int error; 2046 acpi_status status; 2047 2048 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 2049 acpi_dev_parent(device)->handle, 1, 2050 acpi_video_bus_match, NULL, 2051 device, NULL); 2052 if (status == AE_ALREADY_EXISTS) { 2053 pr_info(FW_BUG 2054 "Duplicate ACPI video bus devices for the" 2055 " same VGA controller, please try module " 2056 "parameter \"video.allow_duplicates=1\"" 2057 "if the current driver doesn't work.\n"); 2058 if (!allow_duplicates) 2059 return -ENODEV; 2060 } 2061 2062 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2063 if (!video) 2064 return -ENOMEM; 2065 2066 /* a hack to fix the duplicate name "VID" problem on T61 */ 2067 if (!strcmp(device->pnp.bus_id, "VID")) { 2068 if (instance) 2069 device->pnp.bus_id[3] = '0' + instance; 2070 instance++; 2071 } 2072 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2073 if (!strcmp(device->pnp.bus_id, "VGA")) { 2074 if (instance) 2075 device->pnp.bus_id[3] = '0' + instance; 2076 instance++; 2077 } 2078 2079 video->device = device; 2080 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2081 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2082 device->driver_data = video; 2083 2084 acpi_video_bus_find_cap(video); 2085 error = acpi_video_bus_check(video); 2086 if (error) 2087 goto err_free_video; 2088 2089 mutex_init(&video->device_list_lock); 2090 INIT_LIST_HEAD(&video->video_device_list); 2091 2092 error = acpi_video_bus_get_devices(video, device); 2093 if (error) 2094 goto err_put_video; 2095 2096 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2097 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2098 video->flags.multihead ? "yes" : "no", 2099 video->flags.rom ? "yes" : "no", 2100 video->flags.post ? "yes" : "no"); 2101 mutex_lock(&video_list_lock); 2102 list_add_tail(&video->entry, &video_bus_head); 2103 mutex_unlock(&video_list_lock); 2104 2105 acpi_video_bus_register_backlight(video); 2106 acpi_video_bus_add_notify_handler(video); 2107 2108 return 0; 2109 2110 err_put_video: 2111 acpi_video_bus_put_devices(video); 2112 kfree(video->attached_array); 2113 err_free_video: 2114 kfree(video); 2115 device->driver_data = NULL; 2116 2117 return error; 2118 } 2119 2120 static int acpi_video_bus_remove(struct acpi_device *device) 2121 { 2122 struct acpi_video_bus *video = NULL; 2123 2124 2125 if (!device || !acpi_driver_data(device)) 2126 return -EINVAL; 2127 2128 video = acpi_driver_data(device); 2129 2130 acpi_video_bus_remove_notify_handler(video); 2131 acpi_video_bus_unregister_backlight(video); 2132 acpi_video_bus_put_devices(video); 2133 2134 mutex_lock(&video_list_lock); 2135 list_del(&video->entry); 2136 mutex_unlock(&video_list_lock); 2137 2138 kfree(video->attached_array); 2139 kfree(video); 2140 2141 return 0; 2142 } 2143 2144 static int __init is_i740(struct pci_dev *dev) 2145 { 2146 if (dev->device == 0x00D1) 2147 return 1; 2148 if (dev->device == 0x7000) 2149 return 1; 2150 return 0; 2151 } 2152 2153 static int __init intel_opregion_present(void) 2154 { 2155 int opregion = 0; 2156 struct pci_dev *dev = NULL; 2157 u32 address; 2158 2159 for_each_pci_dev(dev) { 2160 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2161 continue; 2162 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2163 continue; 2164 /* We don't want to poke around undefined i740 registers */ 2165 if (is_i740(dev)) 2166 continue; 2167 pci_read_config_dword(dev, 0xfc, &address); 2168 if (!address) 2169 continue; 2170 opregion = 1; 2171 } 2172 return opregion; 2173 } 2174 2175 /* Check if the chassis-type indicates there is no builtin LCD panel */ 2176 static bool dmi_is_desktop(void) 2177 { 2178 const char *chassis_type; 2179 unsigned long type; 2180 2181 chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); 2182 if (!chassis_type) 2183 return false; 2184 2185 if (kstrtoul(chassis_type, 10, &type) != 0) 2186 return false; 2187 2188 switch (type) { 2189 case 0x03: /* Desktop */ 2190 case 0x04: /* Low Profile Desktop */ 2191 case 0x05: /* Pizza Box */ 2192 case 0x06: /* Mini Tower */ 2193 case 0x07: /* Tower */ 2194 case 0x10: /* Lunch Box */ 2195 case 0x11: /* Main Server Chassis */ 2196 return true; 2197 } 2198 2199 return false; 2200 } 2201 2202 /* 2203 * We're seeing a lot of bogus backlight interfaces on newer machines 2204 * without a LCD such as desktops, servers and HDMI sticks. Checking the 2205 * lcd flag fixes this, enable this by default on any machines which are: 2206 * 1. Win8 ready (where we also prefer the native backlight driver, so 2207 * normally the acpi_video code should not register there anyways); *and* 2208 * 2.1 Report a desktop/server DMI chassis-type, or 2209 * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for 2210 backlight control) 2211 */ 2212 static bool should_check_lcd_flag(void) 2213 { 2214 if (!acpi_osi_is_win8()) 2215 return false; 2216 2217 if (dmi_is_desktop()) 2218 return true; 2219 2220 if (acpi_reduced_hardware()) 2221 return true; 2222 2223 return false; 2224 } 2225 2226 int acpi_video_register(void) 2227 { 2228 int ret = 0; 2229 2230 mutex_lock(®ister_count_mutex); 2231 if (register_count) { 2232 /* 2233 * if the function of acpi_video_register is already called, 2234 * don't register the acpi_video_bus again and return no error. 2235 */ 2236 goto leave; 2237 } 2238 2239 if (only_lcd == -1) 2240 only_lcd = should_check_lcd_flag(); 2241 2242 dmi_check_system(video_dmi_table); 2243 2244 ret = acpi_bus_register_driver(&acpi_video_bus); 2245 if (ret) 2246 goto leave; 2247 2248 /* 2249 * When the acpi_video_bus is loaded successfully, increase 2250 * the counter reference. 2251 */ 2252 register_count = 1; 2253 2254 leave: 2255 mutex_unlock(®ister_count_mutex); 2256 return ret; 2257 } 2258 EXPORT_SYMBOL(acpi_video_register); 2259 2260 void acpi_video_unregister(void) 2261 { 2262 mutex_lock(®ister_count_mutex); 2263 if (register_count) { 2264 acpi_bus_unregister_driver(&acpi_video_bus); 2265 register_count = 0; 2266 may_report_brightness_keys = false; 2267 } 2268 mutex_unlock(®ister_count_mutex); 2269 } 2270 EXPORT_SYMBOL(acpi_video_unregister); 2271 2272 void acpi_video_unregister_backlight(void) 2273 { 2274 struct acpi_video_bus *video; 2275 2276 mutex_lock(®ister_count_mutex); 2277 if (register_count) { 2278 mutex_lock(&video_list_lock); 2279 list_for_each_entry(video, &video_bus_head, entry) 2280 acpi_video_bus_unregister_backlight(video); 2281 mutex_unlock(&video_list_lock); 2282 } 2283 mutex_unlock(®ister_count_mutex); 2284 } 2285 2286 bool acpi_video_handles_brightness_key_presses(void) 2287 { 2288 return may_report_brightness_keys && 2289 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2290 } 2291 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2292 2293 /* 2294 * This is kind of nasty. Hardware using Intel chipsets may require 2295 * the video opregion code to be run first in order to initialise 2296 * state before any ACPI video calls are made. To handle this we defer 2297 * registration of the video class until the opregion code has run. 2298 */ 2299 2300 static int __init acpi_video_init(void) 2301 { 2302 /* 2303 * Let the module load even if ACPI is disabled (e.g. due to 2304 * a broken BIOS) so that i915.ko can still be loaded on such 2305 * old systems without an AcpiOpRegion. 2306 * 2307 * acpi_video_register() will report -ENODEV later as well due 2308 * to acpi_disabled when i915.ko tries to register itself afterwards. 2309 */ 2310 if (acpi_disabled) 2311 return 0; 2312 2313 if (intel_opregion_present()) 2314 return 0; 2315 2316 return acpi_video_register(); 2317 } 2318 2319 static void __exit acpi_video_exit(void) 2320 { 2321 acpi_video_detect_exit(); 2322 acpi_video_unregister(); 2323 } 2324 2325 module_init(acpi_video_init); 2326 module_exit(acpi_video_exit); 2327