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 #include <linux/string_choices.h> 31 32 #define ACPI_VIDEO_BUS_NAME "Video Bus" 33 #define ACPI_VIDEO_DEVICE_NAME "Video Device" 34 35 #define MAX_NAME_LEN 20 36 37 MODULE_AUTHOR("Bruno Ducrot"); 38 MODULE_DESCRIPTION("ACPI Video Driver"); 39 MODULE_LICENSE("GPL"); 40 41 static bool brightness_switch_enabled = true; 42 module_param(brightness_switch_enabled, bool, 0644); 43 44 /* 45 * By default, we don't allow duplicate ACPI video bus devices 46 * under the same VGA controller 47 */ 48 static bool allow_duplicates; 49 module_param(allow_duplicates, bool, 0644); 50 51 #define REPORT_OUTPUT_KEY_EVENTS 0x01 52 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 53 static int report_key_events = -1; 54 module_param(report_key_events, int, 0644); 55 MODULE_PARM_DESC(report_key_events, 56 "0: none, 1: output changes, 2: brightness changes, 3: all"); 57 58 static int hw_changes_brightness = -1; 59 module_param(hw_changes_brightness, int, 0644); 60 MODULE_PARM_DESC(hw_changes_brightness, 61 "Set this to 1 on buggy hw which changes the brightness itself when " 62 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); 63 64 /* 65 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 66 * assumed even if not actually set. 67 */ 68 static bool device_id_scheme = false; 69 module_param(device_id_scheme, bool, 0444); 70 71 static int only_lcd; 72 module_param(only_lcd, int, 0444); 73 74 static bool may_report_brightness_keys; 75 static int register_count; 76 static DEFINE_MUTEX(register_count_mutex); 77 static DEFINE_MUTEX(video_list_lock); 78 static LIST_HEAD(video_bus_head); 79 static int acpi_video_bus_add(struct acpi_device *device); 80 static void acpi_video_bus_remove(struct acpi_device *device); 81 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data); 82 83 /* 84 * Indices in the _BCL method response: the first two items are special, 85 * the rest are all supported levels. 86 * 87 * See page 575 of the ACPI spec 3.0 88 */ 89 enum acpi_video_level_idx { 90 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 91 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 92 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 93 }; 94 95 static const struct acpi_device_id video_device_ids[] = { 96 {ACPI_VIDEO_HID, 0}, 97 {"", 0}, 98 }; 99 MODULE_DEVICE_TABLE(acpi, video_device_ids); 100 101 static struct acpi_driver acpi_video_bus = { 102 .name = "video", 103 .class = ACPI_VIDEO_CLASS, 104 .ids = video_device_ids, 105 .ops = { 106 .add = acpi_video_bus_add, 107 .remove = acpi_video_bus_remove, 108 }, 109 }; 110 111 struct acpi_video_bus_flags { 112 u8 multihead:1; /* can switch video heads */ 113 u8 rom:1; /* can retrieve a video rom */ 114 u8 post:1; /* can configure the head to */ 115 u8 reserved:5; 116 }; 117 118 struct acpi_video_bus_cap { 119 u8 _DOS:1; /* Enable/Disable output switching */ 120 u8 _DOD:1; /* Enumerate all devices attached to display adapter */ 121 u8 _ROM:1; /* Get ROM Data */ 122 u8 _GPD:1; /* Get POST Device */ 123 u8 _SPD:1; /* Set POST Device */ 124 u8 _VPO:1; /* Video POST Options */ 125 u8 reserved:2; 126 }; 127 128 struct acpi_video_device_attrib { 129 u32 display_index:4; /* A zero-based instance of the Display */ 130 u32 display_port_attachment:4; /* This field differentiates the display type */ 131 u32 display_type:4; /* Describe the specific type in use */ 132 u32 vendor_specific:4; /* Chipset Vendor Specific */ 133 u32 bios_can_detect:1; /* BIOS can detect the device */ 134 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to 135 the VGA device. */ 136 u32 pipe_id:3; /* For VGA multiple-head devices. */ 137 u32 reserved:10; /* Must be 0 */ 138 139 /* 140 * The device ID might not actually follow the scheme described by this 141 * struct acpi_video_device_attrib. If it does, then this bit 142 * device_id_scheme is set; otherwise, other fields should be ignored. 143 * 144 * (but also see the global flag device_id_scheme) 145 */ 146 u32 device_id_scheme:1; 147 }; 148 149 struct acpi_video_enumerated_device { 150 union { 151 u32 int_val; 152 struct acpi_video_device_attrib attrib; 153 } value; 154 struct acpi_video_device *bind_info; 155 }; 156 157 struct acpi_video_bus { 158 struct acpi_device *device; 159 bool backlight_registered; 160 u8 dos_setting; 161 struct acpi_video_enumerated_device *attached_array; 162 u8 attached_count; 163 u8 child_count; 164 struct acpi_video_bus_cap cap; 165 struct acpi_video_bus_flags flags; 166 struct list_head video_device_list; 167 struct mutex device_list_lock; /* protects video_device_list */ 168 struct list_head entry; 169 struct input_dev *input; 170 char phys[32]; /* for input device */ 171 struct notifier_block pm_nb; 172 }; 173 174 struct acpi_video_device_flags { 175 u8 crt:1; 176 u8 lcd:1; 177 u8 tvout:1; 178 u8 dvi:1; 179 u8 bios:1; 180 u8 unknown:1; 181 u8 notify:1; 182 u8 reserved:1; 183 }; 184 185 struct acpi_video_device_cap { 186 u8 _ADR:1; /* Return the unique ID */ 187 u8 _BCL:1; /* Query list of brightness control levels supported */ 188 u8 _BCM:1; /* Set the brightness level */ 189 u8 _BQC:1; /* Get current brightness level */ 190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ 191 u8 _DDC:1; /* Return the EDID for this device */ 192 }; 193 194 struct acpi_video_device { 195 unsigned long device_id; 196 struct acpi_video_device_flags flags; 197 struct acpi_video_device_cap cap; 198 struct list_head entry; 199 struct delayed_work switch_brightness_work; 200 int switch_brightness_event; 201 struct acpi_video_bus *video; 202 struct acpi_device *dev; 203 struct acpi_video_device_brightness *brightness; 204 struct backlight_device *backlight; 205 struct thermal_cooling_device *cooling_dev; 206 }; 207 208 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); 209 static void acpi_video_device_rebind(struct acpi_video_bus *video); 210 static void acpi_video_device_bind(struct acpi_video_bus *video, 211 struct acpi_video_device *device); 212 static int acpi_video_device_enumerate(struct acpi_video_bus *video); 213 static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, 214 int level); 215 static int acpi_video_device_lcd_get_level_current( 216 struct acpi_video_device *device, 217 unsigned long long *level, bool raw); 218 static int acpi_video_get_next_level(struct acpi_video_device *device, 219 u32 level_current, u32 event); 220 static void acpi_video_switch_brightness(struct work_struct *work); 221 222 /* backlight device sysfs support */ 223 static int acpi_video_get_brightness(struct backlight_device *bd) 224 { 225 unsigned long long cur_level; 226 int i; 227 struct acpi_video_device *vd = bl_get_data(bd); 228 229 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) 230 return -EINVAL; 231 for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { 232 if (vd->brightness->levels[i] == cur_level) 233 return i - ACPI_VIDEO_FIRST_LEVEL; 234 } 235 return 0; 236 } 237 238 static int acpi_video_set_brightness(struct backlight_device *bd) 239 { 240 int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; 241 struct acpi_video_device *vd = bl_get_data(bd); 242 243 cancel_delayed_work(&vd->switch_brightness_work); 244 return acpi_video_device_lcd_set_level(vd, 245 vd->brightness->levels[request_level]); 246 } 247 248 static const struct backlight_ops acpi_backlight_ops = { 249 .get_brightness = acpi_video_get_brightness, 250 .update_status = acpi_video_set_brightness, 251 }; 252 253 /* thermal cooling device callbacks */ 254 static int video_get_max_state(struct thermal_cooling_device *cooling_dev, 255 unsigned long *state) 256 { 257 struct acpi_video_device *video = cooling_dev->devdata; 258 259 *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 260 return 0; 261 } 262 263 static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, 264 unsigned long *state) 265 { 266 struct acpi_video_device *video = cooling_dev->devdata; 267 unsigned long long level; 268 int offset; 269 270 if (acpi_video_device_lcd_get_level_current(video, &level, false)) 271 return -EINVAL; 272 for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; 273 offset++) 274 if (level == video->brightness->levels[offset]) { 275 *state = video->brightness->count - offset - 1; 276 return 0; 277 } 278 279 return -EINVAL; 280 } 281 282 static int 283 video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) 284 { 285 struct acpi_video_device *video = cooling_dev->devdata; 286 int level; 287 288 if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) 289 return -EINVAL; 290 291 state = video->brightness->count - state; 292 level = video->brightness->levels[state - 1]; 293 return acpi_video_device_lcd_set_level(video, level); 294 } 295 296 static const struct thermal_cooling_device_ops video_cooling_ops = { 297 .get_max_state = video_get_max_state, 298 .get_cur_state = video_get_cur_state, 299 .set_cur_state = video_set_cur_state, 300 }; 301 302 /* 303 * -------------------------------------------------------------------------- 304 * Video Management 305 * -------------------------------------------------------------------------- 306 */ 307 308 static int 309 acpi_video_device_lcd_query_levels(acpi_handle handle, 310 union acpi_object **levels) 311 { 312 int status; 313 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 314 union acpi_object *obj; 315 316 317 *levels = NULL; 318 319 status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); 320 if (ACPI_FAILURE(status)) 321 return status; 322 obj = (union acpi_object *)buffer.pointer; 323 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { 324 acpi_handle_info(handle, "Invalid _BCL data\n"); 325 status = -EFAULT; 326 goto err; 327 } 328 329 *levels = obj; 330 331 return 0; 332 333 err: 334 kfree(buffer.pointer); 335 336 return status; 337 } 338 339 static int 340 acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) 341 { 342 int status; 343 int state; 344 345 status = acpi_execute_simple_method(device->dev->handle, 346 "_BCM", level); 347 if (ACPI_FAILURE(status)) { 348 acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n"); 349 return -EIO; 350 } 351 352 device->brightness->curr = level; 353 for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; 354 state++) 355 if (level == device->brightness->levels[state]) { 356 if (device->backlight) 357 device->backlight->props.brightness = 358 state - ACPI_VIDEO_FIRST_LEVEL; 359 return 0; 360 } 361 362 acpi_handle_info(device->dev->handle, "Current brightness invalid\n"); 363 return -EINVAL; 364 } 365 366 /* 367 * For some buggy _BQC methods, we need to add a constant value to 368 * the _BQC return value to get the actual current brightness level 369 */ 370 371 static int bqc_offset_aml_bug_workaround; 372 static int video_set_bqc_offset(const struct dmi_system_id *d) 373 { 374 bqc_offset_aml_bug_workaround = 9; 375 return 0; 376 } 377 378 static int video_set_device_id_scheme(const struct dmi_system_id *d) 379 { 380 device_id_scheme = true; 381 return 0; 382 } 383 384 static int video_enable_only_lcd(const struct dmi_system_id *d) 385 { 386 only_lcd = true; 387 return 0; 388 } 389 390 static int video_set_report_key_events(const struct dmi_system_id *id) 391 { 392 if (report_key_events == -1) 393 report_key_events = (uintptr_t)id->driver_data; 394 return 0; 395 } 396 397 static int video_hw_changes_brightness( 398 const struct dmi_system_id *d) 399 { 400 if (hw_changes_brightness == -1) 401 hw_changes_brightness = 1; 402 return 0; 403 } 404 405 static const struct dmi_system_id video_dmi_table[] = { 406 /* 407 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 408 */ 409 { 410 .callback = video_set_bqc_offset, 411 .ident = "Acer Aspire 5720", 412 .matches = { 413 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 414 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), 415 }, 416 }, 417 { 418 .callback = video_set_bqc_offset, 419 .ident = "Acer Aspire 5710Z", 420 .matches = { 421 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 422 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), 423 }, 424 }, 425 { 426 .callback = video_set_bqc_offset, 427 .ident = "eMachines E510", 428 .matches = { 429 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), 430 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), 431 }, 432 }, 433 { 434 .callback = video_set_bqc_offset, 435 .ident = "Acer Aspire 5315", 436 .matches = { 437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), 439 }, 440 }, 441 { 442 .callback = video_set_bqc_offset, 443 .ident = "Acer Aspire 7720", 444 .matches = { 445 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), 446 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), 447 }, 448 }, 449 450 /* 451 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set 452 * but the IDs actually follow the Device ID Scheme. 453 */ 454 { 455 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 456 .callback = video_set_device_id_scheme, 457 .ident = "ESPRIMO Mobile M9410", 458 .matches = { 459 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 460 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 461 }, 462 }, 463 /* 464 * Some machines have multiple video output devices, but only the one 465 * that is the type of LCD can do the backlight control so we should not 466 * register backlight interface for other video output devices. 467 */ 468 { 469 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ 470 .callback = video_enable_only_lcd, 471 .ident = "ESPRIMO Mobile M9410", 472 .matches = { 473 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), 474 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), 475 }, 476 }, 477 /* 478 * Some machines report wrong key events on the acpi-bus, suppress 479 * key event reporting on these. Note this is only intended to work 480 * around events which are plain wrong. In some cases we get double 481 * events, in this case acpi-video is considered the canonical source 482 * and the events from the other source should be filtered. E.g. 483 * by calling acpi_video_handles_brightness_key_presses() from the 484 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb 485 */ 486 { 487 .callback = video_set_report_key_events, 488 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), 489 .ident = "Dell Vostro V131", 490 .matches = { 491 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 492 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 493 }, 494 }, 495 { 496 .callback = video_set_report_key_events, 497 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 498 .ident = "Dell Vostro 3350", 499 .matches = { 500 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 501 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), 502 }, 503 }, 504 { 505 .callback = video_set_report_key_events, 506 .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), 507 .ident = "COLORFUL X15 AT 23", 508 .matches = { 509 DMI_MATCH(DMI_SYS_VENDOR, "COLORFUL"), 510 DMI_MATCH(DMI_PRODUCT_NAME, "X15 AT 23"), 511 }, 512 }, 513 /* 514 * Some machines change the brightness themselves when a brightness 515 * hotkey gets pressed, despite us telling them not to. In this case 516 * acpi_video_device_notify() should only call backlight_force_update( 517 * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. 518 */ 519 { 520 /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ 521 .callback = video_hw_changes_brightness, 522 .ident = "Packard Bell EasyNote MZ35", 523 .matches = { 524 DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), 525 DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), 526 }, 527 }, 528 {} 529 }; 530 531 static unsigned long long 532 acpi_video_bqc_value_to_level(struct acpi_video_device *device, 533 unsigned long long bqc_value) 534 { 535 unsigned long long level; 536 537 if (device->brightness->flags._BQC_use_index) { 538 /* 539 * _BQC returns an index that doesn't account for the first 2 540 * items with special meaning (see enum acpi_video_level_idx), 541 * so we need to compensate for that by offsetting ourselves 542 */ 543 if (device->brightness->flags._BCL_reversed) 544 bqc_value = device->brightness->count - 545 ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; 546 547 level = device->brightness->levels[bqc_value + 548 ACPI_VIDEO_FIRST_LEVEL]; 549 } else { 550 level = bqc_value; 551 } 552 553 level += bqc_offset_aml_bug_workaround; 554 555 return level; 556 } 557 558 static int 559 acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, 560 unsigned long long *level, bool raw) 561 { 562 acpi_status status = AE_OK; 563 int i; 564 565 if (device->cap._BQC || device->cap._BCQ) { 566 char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; 567 568 status = acpi_evaluate_integer(device->dev->handle, buf, 569 NULL, level); 570 if (ACPI_SUCCESS(status)) { 571 if (raw) { 572 /* 573 * Caller has indicated he wants the raw 574 * value returned by _BQC, so don't furtherly 575 * mess with the value. 576 */ 577 return 0; 578 } 579 580 *level = acpi_video_bqc_value_to_level(device, *level); 581 582 for (i = ACPI_VIDEO_FIRST_LEVEL; 583 i < device->brightness->count; i++) 584 if (device->brightness->levels[i] == *level) { 585 device->brightness->curr = *level; 586 return 0; 587 } 588 /* 589 * BQC returned an invalid level. 590 * Stop using it. 591 */ 592 acpi_handle_info(device->dev->handle, 593 "%s returned an invalid level", buf); 594 device->cap._BQC = device->cap._BCQ = 0; 595 } else { 596 /* 597 * Fixme: 598 * should we return an error or ignore this failure? 599 * dev->brightness->curr is a cached value which stores 600 * the correct current backlight level in most cases. 601 * ACPI video backlight still works w/ buggy _BQC. 602 * http://bugzilla.kernel.org/show_bug.cgi?id=12233 603 */ 604 acpi_handle_info(device->dev->handle, 605 "%s evaluation failed", buf); 606 device->cap._BQC = device->cap._BCQ = 0; 607 } 608 } 609 610 *level = device->brightness->curr; 611 return 0; 612 } 613 614 /** 615 * acpi_video_device_EDID() - Get EDID from ACPI _DDC 616 * @device: video output device (LCD, CRT, ..) 617 * @edid: address for returned EDID pointer 618 * @length: _DDC length to request (must be a multiple of 128) 619 * 620 * Get EDID from ACPI _DDC. On success, a pointer to the EDID data is written 621 * to the @edid address, and the length of the EDID is returned. The caller is 622 * responsible for freeing the edid pointer. 623 * 624 * Return the length of EDID (positive value) on success or error (negative 625 * value). 626 */ 627 static int 628 acpi_video_device_EDID(struct acpi_video_device *device, void **edid, int length) 629 { 630 acpi_status status; 631 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 632 union acpi_object *obj; 633 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 634 struct acpi_object_list args = { 1, &arg0 }; 635 int ret; 636 637 *edid = NULL; 638 639 if (!device) 640 return -ENODEV; 641 if (!length || (length % 128)) 642 return -EINVAL; 643 644 arg0.integer.value = length / 128; 645 646 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); 647 if (ACPI_FAILURE(status)) 648 return -ENODEV; 649 650 obj = buffer.pointer; 651 652 if (obj && obj->type == ACPI_TYPE_BUFFER) { 653 *edid = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL); 654 ret = *edid ? obj->buffer.length : -ENOMEM; 655 } else { 656 acpi_handle_debug(device->dev->handle, 657 "Invalid _DDC data for length %d\n", length); 658 ret = -EFAULT; 659 } 660 661 kfree(obj); 662 return ret; 663 } 664 665 /* bus */ 666 667 /* 668 * Arg: 669 * video : video bus device pointer 670 * bios_flag : 671 * 0. The system BIOS should NOT automatically switch(toggle) 672 * the active display output. 673 * 1. The system BIOS should automatically switch (toggle) the 674 * active display output. No switch event. 675 * 2. The _DGS value should be locked. 676 * 3. The system BIOS should not automatically switch (toggle) the 677 * active display output, but instead generate the display switch 678 * event notify code. 679 * lcd_flag : 680 * 0. The system BIOS should automatically control the brightness level 681 * of the LCD when: 682 * - the power changes from AC to DC (ACPI appendix B) 683 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 684 * 1. The system BIOS should NOT automatically control the brightness 685 * level of the LCD when: 686 * - the power changes from AC to DC (ACPI appendix B) 687 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 688 * Return Value: 689 * -EINVAL wrong arg. 690 */ 691 692 static int 693 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 694 { 695 acpi_status status; 696 697 if (!video->cap._DOS) 698 return 0; 699 700 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 701 return -EINVAL; 702 video->dos_setting = (lcd_flag << 2) | bios_flag; 703 status = acpi_execute_simple_method(video->device->handle, "_DOS", 704 (lcd_flag << 2) | bios_flag); 705 if (ACPI_FAILURE(status)) 706 return -EIO; 707 708 return 0; 709 } 710 711 /* 712 * Simple comparison function used to sort backlight levels. 713 */ 714 715 static int 716 acpi_video_cmp_level(const void *a, const void *b) 717 { 718 return *(int *)a - *(int *)b; 719 } 720 721 /* 722 * Decides if _BQC/_BCQ for this system is usable 723 * 724 * We do this by changing the level first and then read out the current 725 * brightness level, if the value does not match, find out if it is using 726 * index. If not, clear the _BQC/_BCQ capability. 727 */ 728 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 729 int max_level, int current_level) 730 { 731 struct acpi_video_device_brightness *br = device->brightness; 732 int result; 733 unsigned long long level; 734 int test_level; 735 736 /* don't mess with existing known broken systems */ 737 if (bqc_offset_aml_bug_workaround) 738 return 0; 739 740 /* 741 * Some systems always report current brightness level as maximum 742 * through _BQC, we need to test another value for them. However, 743 * there is a subtlety: 744 * 745 * If the _BCL package ordering is descending, the first level 746 * (br->levels[2]) is likely to be 0, and if the number of levels 747 * matches the number of steps, we might confuse a returned level to 748 * mean the index. 749 * 750 * For example: 751 * 752 * current_level = max_level = 100 753 * test_level = 0 754 * returned level = 100 755 * 756 * In this case 100 means the level, not the index, and _BCM failed. 757 * Still, if the _BCL package ordering is descending, the index of 758 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 759 * 760 * This causes all _BQC calls to return bogus values causing weird 761 * behavior from the user's perspective. For example: 762 * 763 * xbacklight -set 10; xbacklight -set 20; 764 * 765 * would flash to 90% and then slowly down to the desired level (20). 766 * 767 * The solution is simple; test anything other than the first level 768 * (e.g. 1). 769 */ 770 test_level = current_level == max_level 771 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 772 : max_level; 773 774 result = acpi_video_device_lcd_set_level(device, test_level); 775 if (result) 776 return result; 777 778 result = acpi_video_device_lcd_get_level_current(device, &level, true); 779 if (result) 780 return result; 781 782 if (level != test_level) { 783 /* buggy _BQC found, need to find out if it uses index */ 784 if (level < br->count) { 785 if (br->flags._BCL_reversed) 786 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 787 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 788 br->flags._BQC_use_index = 1; 789 } 790 791 if (!br->flags._BQC_use_index) 792 device->cap._BQC = device->cap._BCQ = 0; 793 } 794 795 return 0; 796 } 797 798 int acpi_video_get_levels(struct acpi_device *device, 799 struct acpi_video_device_brightness **dev_br, 800 int *pmax_level) 801 { 802 union acpi_object *obj = NULL; 803 int i, max_level = 0, count = 0, level_ac_battery = 0; 804 union acpi_object *o; 805 struct acpi_video_device_brightness *br = NULL; 806 int result = 0; 807 u32 value; 808 809 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 810 acpi_handle_debug(device->handle, 811 "Could not query available LCD brightness level\n"); 812 result = -ENODEV; 813 goto out; 814 } 815 816 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 817 result = -EINVAL; 818 goto out; 819 } 820 821 br = kzalloc(sizeof(*br), GFP_KERNEL); 822 if (!br) { 823 result = -ENOMEM; 824 goto out; 825 } 826 827 /* 828 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 829 * in order to account for buggy BIOS which don't export the first two 830 * special levels (see below) 831 */ 832 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 833 sizeof(*br->levels), 834 GFP_KERNEL); 835 if (!br->levels) { 836 result = -ENOMEM; 837 goto out_free; 838 } 839 840 for (i = 0; i < obj->package.count; i++) { 841 o = (union acpi_object *)&obj->package.elements[i]; 842 if (o->type != ACPI_TYPE_INTEGER) { 843 acpi_handle_info(device->handle, "Invalid data\n"); 844 continue; 845 } 846 value = (u32) o->integer.value; 847 /* Skip duplicate entries */ 848 if (count > ACPI_VIDEO_FIRST_LEVEL 849 && br->levels[count - 1] == value) 850 continue; 851 852 br->levels[count] = value; 853 854 if (br->levels[count] > max_level) 855 max_level = br->levels[count]; 856 count++; 857 } 858 859 /* 860 * some buggy BIOS don't export the levels 861 * when machine is on AC/Battery in _BCL package. 862 * In this case, the first two elements in _BCL packages 863 * are also supported brightness levels that OS should take care of. 864 */ 865 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 866 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 867 level_ac_battery++; 868 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 869 level_ac_battery++; 870 } 871 872 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 873 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 874 br->flags._BCL_no_ac_battery_levels = 1; 875 for (i = (count - 1 + level_ac_battery); 876 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 877 br->levels[i] = br->levels[i - level_ac_battery]; 878 count += level_ac_battery; 879 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 880 acpi_handle_info(device->handle, 881 "Too many duplicates in _BCL package"); 882 883 /* Check if the _BCL package is in a reversed order */ 884 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 885 br->flags._BCL_reversed = 1; 886 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 887 count - ACPI_VIDEO_FIRST_LEVEL, 888 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 889 acpi_video_cmp_level, NULL); 890 } else if (max_level != br->levels[count - 1]) 891 acpi_handle_info(device->handle, 892 "Found unordered _BCL package"); 893 894 br->count = count; 895 *dev_br = br; 896 if (pmax_level) 897 *pmax_level = max_level; 898 899 out: 900 kfree(obj); 901 return result; 902 out_free: 903 kfree(br); 904 goto out; 905 } 906 EXPORT_SYMBOL(acpi_video_get_levels); 907 908 /* 909 * Arg: 910 * device : video output device (LCD, CRT, ..) 911 * 912 * Return Value: 913 * Maximum brightness level 914 * 915 * Allocate and initialize device->brightness. 916 */ 917 918 static int 919 acpi_video_init_brightness(struct acpi_video_device *device) 920 { 921 int i, max_level = 0; 922 unsigned long long level, level_old; 923 struct acpi_video_device_brightness *br = NULL; 924 int result; 925 926 result = acpi_video_get_levels(device->dev, &br, &max_level); 927 if (result) 928 return result; 929 device->brightness = br; 930 931 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 932 br->curr = level = max_level; 933 934 if (!device->cap._BQC) 935 goto set_level; 936 937 result = acpi_video_device_lcd_get_level_current(device, 938 &level_old, true); 939 if (result) 940 goto out_free_levels; 941 942 result = acpi_video_bqc_quirk(device, max_level, level_old); 943 if (result) 944 goto out_free_levels; 945 /* 946 * cap._BQC may get cleared due to _BQC is found to be broken 947 * in acpi_video_bqc_quirk, so check again here. 948 */ 949 if (!device->cap._BQC) 950 goto set_level; 951 952 level = acpi_video_bqc_value_to_level(device, level_old); 953 /* 954 * On some buggy laptops, _BQC returns an uninitialized 955 * value when invoked for the first time, i.e. 956 * level_old is invalid (no matter whether it's a level 957 * or an index). Set the backlight to max_level in this case. 958 */ 959 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 960 if (level == br->levels[i]) 961 break; 962 if (i == br->count || !level) 963 level = max_level; 964 965 set_level: 966 result = acpi_video_device_lcd_set_level(device, level); 967 if (result) 968 goto out_free_levels; 969 970 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 971 br->count - ACPI_VIDEO_FIRST_LEVEL); 972 973 return 0; 974 975 out_free_levels: 976 kfree(br->levels); 977 kfree(br); 978 device->brightness = NULL; 979 return result; 980 } 981 982 /* 983 * Arg: 984 * device : video output device (LCD, CRT, ..) 985 * 986 * Return Value: 987 * None 988 * 989 * Find out all required AML methods defined under the output 990 * device. 991 */ 992 993 static void acpi_video_device_find_cap(struct acpi_video_device *device) 994 { 995 if (acpi_has_method(device->dev->handle, "_ADR")) 996 device->cap._ADR = 1; 997 if (acpi_has_method(device->dev->handle, "_BCL")) 998 device->cap._BCL = 1; 999 if (acpi_has_method(device->dev->handle, "_BCM")) 1000 device->cap._BCM = 1; 1001 if (acpi_has_method(device->dev->handle, "_BQC")) { 1002 device->cap._BQC = 1; 1003 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 1004 acpi_handle_info(device->dev->handle, 1005 "_BCQ is used instead of _BQC\n"); 1006 device->cap._BCQ = 1; 1007 } 1008 1009 if (acpi_has_method(device->dev->handle, "_DDC")) 1010 device->cap._DDC = 1; 1011 } 1012 1013 /* 1014 * Arg: 1015 * device : video output device (VGA) 1016 * 1017 * Return Value: 1018 * None 1019 * 1020 * Find out all required AML methods defined under the video bus device. 1021 */ 1022 1023 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1024 { 1025 if (acpi_has_method(video->device->handle, "_DOS")) 1026 video->cap._DOS = 1; 1027 if (acpi_has_method(video->device->handle, "_DOD")) 1028 video->cap._DOD = 1; 1029 if (acpi_has_method(video->device->handle, "_ROM")) 1030 video->cap._ROM = 1; 1031 if (acpi_has_method(video->device->handle, "_GPD")) 1032 video->cap._GPD = 1; 1033 if (acpi_has_method(video->device->handle, "_SPD")) 1034 video->cap._SPD = 1; 1035 if (acpi_has_method(video->device->handle, "_VPO")) 1036 video->cap._VPO = 1; 1037 } 1038 1039 /* 1040 * Check whether the video bus device has required AML method to 1041 * support the desired features 1042 */ 1043 1044 static int acpi_video_bus_check(struct acpi_video_bus *video) 1045 { 1046 acpi_status status = -ENOENT; 1047 struct pci_dev *dev; 1048 1049 if (!video) 1050 return -EINVAL; 1051 1052 dev = acpi_get_pci_dev(video->device->handle); 1053 if (!dev) 1054 return -ENODEV; 1055 pci_dev_put(dev); 1056 1057 /* 1058 * Since there is no HID, CID and so on for VGA driver, we have 1059 * to check well known required nodes. 1060 */ 1061 1062 /* Does this device support video switching? */ 1063 if (video->cap._DOS || video->cap._DOD) { 1064 if (!video->cap._DOS) { 1065 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1066 acpi_device_bid(video->device)); 1067 } 1068 video->flags.multihead = 1; 1069 status = 0; 1070 } 1071 1072 /* Does this device support retrieving a video ROM? */ 1073 if (video->cap._ROM) { 1074 video->flags.rom = 1; 1075 status = 0; 1076 } 1077 1078 /* Does this device support configuring which video device to POST? */ 1079 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1080 video->flags.post = 1; 1081 status = 0; 1082 } 1083 1084 return status; 1085 } 1086 1087 /* 1088 * -------------------------------------------------------------------------- 1089 * Driver Interface 1090 * -------------------------------------------------------------------------- 1091 */ 1092 1093 /* device interface */ 1094 static struct acpi_video_device_attrib * 1095 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1096 { 1097 struct acpi_video_enumerated_device *ids; 1098 int i; 1099 1100 for (i = 0; i < video->attached_count; i++) { 1101 ids = &video->attached_array[i]; 1102 if ((ids->value.int_val & 0xffff) == device_id) 1103 return &ids->value.attrib; 1104 } 1105 1106 return NULL; 1107 } 1108 1109 static int 1110 acpi_video_get_device_type(struct acpi_video_bus *video, 1111 unsigned long device_id) 1112 { 1113 struct acpi_video_enumerated_device *ids; 1114 int i; 1115 1116 for (i = 0; i < video->attached_count; i++) { 1117 ids = &video->attached_array[i]; 1118 if ((ids->value.int_val & 0xffff) == device_id) 1119 return ids->value.int_val; 1120 } 1121 1122 return 0; 1123 } 1124 1125 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1126 { 1127 struct acpi_video_bus *video = arg; 1128 struct acpi_video_device_attrib *attribute; 1129 struct acpi_video_device *data; 1130 unsigned long long device_id; 1131 acpi_status status; 1132 int device_type; 1133 1134 status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); 1135 /* Skip devices without _ADR instead of failing. */ 1136 if (ACPI_FAILURE(status)) 1137 goto exit; 1138 1139 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1140 if (!data) { 1141 dev_dbg(&device->dev, "Cannot attach\n"); 1142 return -ENOMEM; 1143 } 1144 1145 strscpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1146 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1147 1148 data->device_id = device_id; 1149 data->video = video; 1150 data->dev = device; 1151 INIT_DELAYED_WORK(&data->switch_brightness_work, 1152 acpi_video_switch_brightness); 1153 1154 attribute = acpi_video_get_device_attr(video, device_id); 1155 1156 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1157 switch (attribute->display_type) { 1158 case ACPI_VIDEO_DISPLAY_CRT: 1159 data->flags.crt = 1; 1160 break; 1161 case ACPI_VIDEO_DISPLAY_TV: 1162 data->flags.tvout = 1; 1163 break; 1164 case ACPI_VIDEO_DISPLAY_DVI: 1165 data->flags.dvi = 1; 1166 break; 1167 case ACPI_VIDEO_DISPLAY_LCD: 1168 data->flags.lcd = 1; 1169 break; 1170 default: 1171 data->flags.unknown = 1; 1172 break; 1173 } 1174 if (attribute->bios_can_detect) 1175 data->flags.bios = 1; 1176 } else { 1177 /* Check for legacy IDs */ 1178 device_type = acpi_video_get_device_type(video, device_id); 1179 /* Ignore bits 16 and 18-20 */ 1180 switch (device_type & 0xffe2ffff) { 1181 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1182 data->flags.crt = 1; 1183 break; 1184 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1185 data->flags.lcd = 1; 1186 break; 1187 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1188 data->flags.tvout = 1; 1189 break; 1190 default: 1191 data->flags.unknown = 1; 1192 } 1193 } 1194 1195 acpi_video_device_bind(video, data); 1196 acpi_video_device_find_cap(data); 1197 1198 if (data->cap._BCM && data->cap._BCL) 1199 may_report_brightness_keys = true; 1200 1201 mutex_lock(&video->device_list_lock); 1202 list_add_tail(&data->entry, &video->video_device_list); 1203 mutex_unlock(&video->device_list_lock); 1204 1205 exit: 1206 video->child_count++; 1207 return 0; 1208 } 1209 1210 /* 1211 * Arg: 1212 * video : video bus device 1213 * 1214 * Return: 1215 * none 1216 * 1217 * Enumerate the video device list of the video bus, 1218 * bind the ids with the corresponding video devices 1219 * under the video bus. 1220 */ 1221 1222 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1223 { 1224 struct acpi_video_device *dev; 1225 1226 mutex_lock(&video->device_list_lock); 1227 1228 list_for_each_entry(dev, &video->video_device_list, entry) 1229 acpi_video_device_bind(video, dev); 1230 1231 mutex_unlock(&video->device_list_lock); 1232 } 1233 1234 /* 1235 * Arg: 1236 * video : video bus device 1237 * device : video output device under the video 1238 * bus 1239 * 1240 * Return: 1241 * none 1242 * 1243 * Bind the ids with the corresponding video devices 1244 * under the video bus. 1245 */ 1246 1247 static void 1248 acpi_video_device_bind(struct acpi_video_bus *video, 1249 struct acpi_video_device *device) 1250 { 1251 struct acpi_video_enumerated_device *ids; 1252 int i; 1253 1254 for (i = 0; i < video->attached_count; i++) { 1255 ids = &video->attached_array[i]; 1256 if (device->device_id == (ids->value.int_val & 0xffff)) { 1257 ids->bind_info = device; 1258 acpi_handle_debug(video->device->handle, "%s: %d\n", 1259 __func__, i); 1260 } 1261 } 1262 } 1263 1264 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1265 { 1266 struct acpi_video_bus *video = device->video; 1267 int i; 1268 1269 /* 1270 * If we have a broken _DOD or we have more than 8 output devices 1271 * under the graphics controller node that we can't proper deal with 1272 * in the operation region code currently, no need to test. 1273 */ 1274 if (!video->attached_count || video->child_count > 8) 1275 return true; 1276 1277 for (i = 0; i < video->attached_count; i++) { 1278 if ((video->attached_array[i].value.int_val & 0xfff) == 1279 (device->device_id & 0xfff)) 1280 return true; 1281 } 1282 1283 return false; 1284 } 1285 1286 /* 1287 * Arg: 1288 * video : video bus device 1289 * 1290 * Return: 1291 * < 0 : error 1292 * 1293 * Call _DOD to enumerate all devices attached to display adapter 1294 * 1295 */ 1296 1297 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1298 { 1299 int status; 1300 int count; 1301 int i; 1302 struct acpi_video_enumerated_device *active_list; 1303 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1304 union acpi_object *dod = NULL; 1305 union acpi_object *obj; 1306 1307 if (!video->cap._DOD) 1308 return AE_NOT_EXIST; 1309 1310 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1311 if (ACPI_FAILURE(status)) { 1312 acpi_handle_info(video->device->handle, 1313 "_DOD evaluation failed: %s\n", 1314 acpi_format_exception(status)); 1315 return status; 1316 } 1317 1318 dod = buffer.pointer; 1319 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1320 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1321 status = -EFAULT; 1322 goto out; 1323 } 1324 1325 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1326 dod->package.count); 1327 1328 active_list = kcalloc(1 + dod->package.count, 1329 sizeof(struct acpi_video_enumerated_device), 1330 GFP_KERNEL); 1331 if (!active_list) { 1332 status = -ENOMEM; 1333 goto out; 1334 } 1335 1336 count = 0; 1337 for (i = 0; i < dod->package.count; i++) { 1338 obj = &dod->package.elements[i]; 1339 1340 if (obj->type != ACPI_TYPE_INTEGER) { 1341 acpi_handle_info(video->device->handle, 1342 "Invalid _DOD data in element %d\n", i); 1343 continue; 1344 } 1345 1346 active_list[count].value.int_val = obj->integer.value; 1347 active_list[count].bind_info = NULL; 1348 1349 acpi_handle_debug(video->device->handle, 1350 "_DOD element[%d] = %d\n", i, 1351 (int)obj->integer.value); 1352 1353 count++; 1354 } 1355 1356 kfree(video->attached_array); 1357 1358 video->attached_array = active_list; 1359 video->attached_count = count; 1360 1361 out: 1362 kfree(buffer.pointer); 1363 return status; 1364 } 1365 1366 static int 1367 acpi_video_get_next_level(struct acpi_video_device *device, 1368 u32 level_current, u32 event) 1369 { 1370 int min, max, min_above, max_below, i, l, delta = 255; 1371 max = max_below = 0; 1372 min = min_above = 255; 1373 /* Find closest level to level_current */ 1374 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1375 l = device->brightness->levels[i]; 1376 if (abs(l - level_current) < abs(delta)) { 1377 delta = l - level_current; 1378 if (!delta) 1379 break; 1380 } 1381 } 1382 /* Adjust level_current to closest available level */ 1383 level_current += delta; 1384 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1385 l = device->brightness->levels[i]; 1386 if (l < min) 1387 min = l; 1388 if (l > max) 1389 max = l; 1390 if (l < min_above && l > level_current) 1391 min_above = l; 1392 if (l > max_below && l < level_current) 1393 max_below = l; 1394 } 1395 1396 switch (event) { 1397 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1398 return (level_current < max) ? min_above : min; 1399 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1400 return (level_current < max) ? min_above : max; 1401 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1402 return (level_current > min) ? max_below : min; 1403 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1404 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1405 return 0; 1406 default: 1407 return level_current; 1408 } 1409 } 1410 1411 static void 1412 acpi_video_switch_brightness(struct work_struct *work) 1413 { 1414 struct acpi_video_device *device = container_of(to_delayed_work(work), 1415 struct acpi_video_device, switch_brightness_work); 1416 unsigned long long level_current, level_next; 1417 int event = device->switch_brightness_event; 1418 int result = -EINVAL; 1419 1420 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1421 if (!device->backlight) 1422 return; 1423 1424 if (!device->brightness) 1425 goto out; 1426 1427 result = acpi_video_device_lcd_get_level_current(device, 1428 &level_current, 1429 false); 1430 if (result) 1431 goto out; 1432 1433 level_next = acpi_video_get_next_level(device, level_current, event); 1434 1435 result = acpi_video_device_lcd_set_level(device, level_next); 1436 1437 if (!result) 1438 backlight_force_update(device->backlight, 1439 BACKLIGHT_UPDATE_HOTKEY); 1440 1441 out: 1442 if (result) 1443 acpi_handle_info(device->dev->handle, 1444 "Failed to switch brightness\n"); 1445 } 1446 1447 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1448 void **edid) 1449 { 1450 struct acpi_video_bus *video; 1451 struct acpi_video_device *video_device; 1452 int i, length, ret; 1453 1454 if (!device || !acpi_driver_data(device)) 1455 return -EINVAL; 1456 1457 video = acpi_driver_data(device); 1458 1459 for (i = 0; i < video->attached_count; i++) { 1460 video_device = video->attached_array[i].bind_info; 1461 1462 if (!video_device) 1463 continue; 1464 1465 if (!video_device->cap._DDC) 1466 continue; 1467 1468 if (type) { 1469 switch (type) { 1470 case ACPI_VIDEO_DISPLAY_CRT: 1471 if (!video_device->flags.crt) 1472 continue; 1473 break; 1474 case ACPI_VIDEO_DISPLAY_TV: 1475 if (!video_device->flags.tvout) 1476 continue; 1477 break; 1478 case ACPI_VIDEO_DISPLAY_DVI: 1479 if (!video_device->flags.dvi) 1480 continue; 1481 break; 1482 case ACPI_VIDEO_DISPLAY_LCD: 1483 if (!video_device->flags.lcd) 1484 continue; 1485 break; 1486 } 1487 } else if (video_device->device_id != device_id) { 1488 continue; 1489 } 1490 1491 for (length = 512; length > 0; length -= 128) { 1492 ret = acpi_video_device_EDID(video_device, edid, length); 1493 if (ret > 0) 1494 return ret; 1495 } 1496 } 1497 1498 return -ENODEV; 1499 } 1500 EXPORT_SYMBOL(acpi_video_get_edid); 1501 1502 static int 1503 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1504 struct acpi_device *device) 1505 { 1506 /* 1507 * There are systems where video module known to work fine regardless 1508 * of broken _DOD and ignoring returned value here doesn't cause 1509 * any issues later. 1510 */ 1511 acpi_video_device_enumerate(video); 1512 1513 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1514 } 1515 1516 /* acpi_video interface */ 1517 1518 /* 1519 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1520 * perform any automatic brightness change on receiving a notification. 1521 */ 1522 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1523 { 1524 return acpi_video_bus_DOS(video, 0, 1525 acpi_osi_is_win8() ? 1 : 0); 1526 } 1527 1528 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1529 { 1530 return acpi_video_bus_DOS(video, 0, 1531 acpi_osi_is_win8() ? 0 : 1); 1532 } 1533 1534 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data) 1535 { 1536 struct acpi_device *device = data; 1537 struct acpi_video_bus *video = acpi_driver_data(device); 1538 struct input_dev *input; 1539 int keycode = 0; 1540 1541 if (!video || !video->input) 1542 return; 1543 1544 input = video->input; 1545 1546 switch (event) { 1547 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1548 * most likely via hotkey. */ 1549 keycode = KEY_SWITCHVIDEOMODE; 1550 break; 1551 1552 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1553 * connector. */ 1554 acpi_video_device_enumerate(video); 1555 acpi_video_device_rebind(video); 1556 keycode = KEY_SWITCHVIDEOMODE; 1557 break; 1558 1559 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1560 keycode = KEY_SWITCHVIDEOMODE; 1561 break; 1562 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1563 keycode = KEY_VIDEO_NEXT; 1564 break; 1565 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1566 keycode = KEY_VIDEO_PREV; 1567 break; 1568 1569 default: 1570 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1571 event); 1572 break; 1573 } 1574 1575 if (acpi_notifier_call_chain(device, event, 0)) 1576 /* Something vetoed the keypress. */ 1577 keycode = 0; 1578 1579 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1580 input_report_key(input, keycode, 1); 1581 input_sync(input); 1582 input_report_key(input, keycode, 0); 1583 input_sync(input); 1584 } 1585 } 1586 1587 static void brightness_switch_event(struct acpi_video_device *video_device, 1588 u32 event) 1589 { 1590 if (!brightness_switch_enabled) 1591 return; 1592 1593 video_device->switch_brightness_event = event; 1594 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1595 } 1596 1597 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1598 { 1599 struct acpi_video_device *video_device = data; 1600 struct acpi_device *device = NULL; 1601 struct acpi_video_bus *bus; 1602 struct input_dev *input; 1603 int keycode = 0; 1604 1605 if (!video_device) 1606 return; 1607 1608 device = video_device->dev; 1609 bus = video_device->video; 1610 input = bus->input; 1611 1612 if (hw_changes_brightness > 0) { 1613 if (video_device->backlight) 1614 backlight_force_update(video_device->backlight, 1615 BACKLIGHT_UPDATE_HOTKEY); 1616 acpi_notifier_call_chain(device, event, 0); 1617 return; 1618 } 1619 1620 switch (event) { 1621 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1622 brightness_switch_event(video_device, event); 1623 keycode = KEY_BRIGHTNESS_CYCLE; 1624 break; 1625 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1626 brightness_switch_event(video_device, event); 1627 keycode = KEY_BRIGHTNESSUP; 1628 break; 1629 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1630 brightness_switch_event(video_device, event); 1631 keycode = KEY_BRIGHTNESSDOWN; 1632 break; 1633 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1634 brightness_switch_event(video_device, event); 1635 keycode = KEY_BRIGHTNESS_ZERO; 1636 break; 1637 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1638 brightness_switch_event(video_device, event); 1639 keycode = KEY_DISPLAY_OFF; 1640 break; 1641 default: 1642 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1643 break; 1644 } 1645 1646 if (keycode) 1647 may_report_brightness_keys = true; 1648 1649 acpi_notifier_call_chain(device, event, 0); 1650 1651 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1652 input_report_key(input, keycode, 1); 1653 input_sync(input); 1654 input_report_key(input, keycode, 0); 1655 input_sync(input); 1656 } 1657 } 1658 1659 static int acpi_video_resume(struct notifier_block *nb, 1660 unsigned long val, void *ign) 1661 { 1662 struct acpi_video_bus *video; 1663 struct acpi_video_device *video_device; 1664 int i; 1665 1666 switch (val) { 1667 case PM_POST_HIBERNATION: 1668 case PM_POST_SUSPEND: 1669 case PM_POST_RESTORE: 1670 video = container_of(nb, struct acpi_video_bus, pm_nb); 1671 1672 dev_info(&video->device->dev, "Restoring backlight state\n"); 1673 1674 for (i = 0; i < video->attached_count; i++) { 1675 video_device = video->attached_array[i].bind_info; 1676 if (video_device && video_device->brightness) 1677 acpi_video_device_lcd_set_level(video_device, 1678 video_device->brightness->curr); 1679 } 1680 1681 return NOTIFY_OK; 1682 } 1683 return NOTIFY_DONE; 1684 } 1685 1686 static acpi_status 1687 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1688 void **return_value) 1689 { 1690 struct acpi_device *device = context; 1691 struct acpi_device *sibling; 1692 1693 if (handle == device->handle) 1694 return AE_CTRL_TERMINATE; 1695 1696 sibling = acpi_fetch_acpi_dev(handle); 1697 if (!sibling) 1698 return AE_OK; 1699 1700 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1701 return AE_ALREADY_EXISTS; 1702 1703 return AE_OK; 1704 } 1705 1706 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1707 { 1708 struct backlight_properties props; 1709 struct pci_dev *pdev; 1710 acpi_handle acpi_parent; 1711 struct device *parent = NULL; 1712 int result; 1713 static int count; 1714 char *name; 1715 1716 result = acpi_video_init_brightness(device); 1717 if (result) 1718 return; 1719 1720 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1721 if (!name) 1722 return; 1723 count++; 1724 1725 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) { 1726 pdev = acpi_get_pci_dev(acpi_parent); 1727 if (pdev) { 1728 parent = &pdev->dev; 1729 pci_dev_put(pdev); 1730 } 1731 } 1732 1733 memset(&props, 0, sizeof(struct backlight_properties)); 1734 props.type = BACKLIGHT_FIRMWARE; 1735 props.max_brightness = 1736 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1737 device->backlight = backlight_device_register(name, 1738 parent, 1739 device, 1740 &acpi_backlight_ops, 1741 &props); 1742 kfree(name); 1743 if (IS_ERR(device->backlight)) { 1744 device->backlight = NULL; 1745 return; 1746 } 1747 1748 /* 1749 * Save current brightness level in case we have to restore it 1750 * before acpi_video_device_lcd_set_level() is called next time. 1751 */ 1752 device->backlight->props.brightness = 1753 acpi_video_get_brightness(device->backlight); 1754 1755 device->cooling_dev = thermal_cooling_device_register("LCD", device, 1756 &video_cooling_ops); 1757 if (IS_ERR(device->cooling_dev)) { 1758 /* 1759 * Set cooling_dev to NULL so we don't crash trying to free it. 1760 * Also, why the hell we are returning early and not attempt to 1761 * register video output if cooling device registration failed? 1762 * -- dtor 1763 */ 1764 device->cooling_dev = NULL; 1765 return; 1766 } 1767 1768 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1769 device->cooling_dev->id); 1770 result = sysfs_create_link(&device->dev->dev.kobj, 1771 &device->cooling_dev->device.kobj, 1772 "thermal_cooling"); 1773 if (result) 1774 pr_info("sysfs link creation failed\n"); 1775 1776 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1777 &device->dev->dev.kobj, "device"); 1778 if (result) 1779 pr_info("Reverse sysfs link creation failed\n"); 1780 } 1781 1782 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1783 { 1784 struct acpi_video_device *dev; 1785 union acpi_object *levels; 1786 1787 mutex_lock(&video->device_list_lock); 1788 list_for_each_entry(dev, &video->video_device_list, entry) { 1789 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1790 kfree(levels); 1791 } 1792 mutex_unlock(&video->device_list_lock); 1793 } 1794 1795 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1796 { 1797 /* 1798 * Do not create backlight device for video output 1799 * device that is not in the enumerated list. 1800 */ 1801 if (!acpi_video_device_in_dod(dev)) { 1802 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1803 return false; 1804 } 1805 1806 if (only_lcd) 1807 return dev->flags.lcd; 1808 return true; 1809 } 1810 1811 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1812 { 1813 struct acpi_video_device *dev; 1814 1815 if (video->backlight_registered) 1816 return 0; 1817 1818 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1819 return 0; 1820 1821 mutex_lock(&video->device_list_lock); 1822 list_for_each_entry(dev, &video->video_device_list, entry) { 1823 if (acpi_video_should_register_backlight(dev)) 1824 acpi_video_dev_register_backlight(dev); 1825 } 1826 mutex_unlock(&video->device_list_lock); 1827 1828 video->backlight_registered = true; 1829 1830 video->pm_nb.notifier_call = acpi_video_resume; 1831 video->pm_nb.priority = 0; 1832 return register_pm_notifier(&video->pm_nb); 1833 } 1834 1835 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1836 { 1837 if (device->backlight) { 1838 backlight_device_unregister(device->backlight); 1839 device->backlight = NULL; 1840 } 1841 if (device->brightness) { 1842 kfree(device->brightness->levels); 1843 kfree(device->brightness); 1844 device->brightness = NULL; 1845 } 1846 if (device->cooling_dev) { 1847 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1848 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1849 thermal_cooling_device_unregister(device->cooling_dev); 1850 device->cooling_dev = NULL; 1851 } 1852 } 1853 1854 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1855 { 1856 struct acpi_video_device *dev; 1857 int error; 1858 1859 if (!video->backlight_registered) 1860 return 0; 1861 1862 error = unregister_pm_notifier(&video->pm_nb); 1863 1864 mutex_lock(&video->device_list_lock); 1865 list_for_each_entry(dev, &video->video_device_list, entry) 1866 acpi_video_dev_unregister_backlight(dev); 1867 mutex_unlock(&video->device_list_lock); 1868 1869 video->backlight_registered = false; 1870 1871 return error; 1872 } 1873 1874 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1875 { 1876 acpi_status status; 1877 struct acpi_device *adev = device->dev; 1878 1879 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1880 acpi_video_device_notify, device); 1881 if (ACPI_FAILURE(status)) 1882 dev_err(&adev->dev, "Error installing notify handler\n"); 1883 else 1884 device->flags.notify = 1; 1885 } 1886 1887 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) 1888 { 1889 struct input_dev *input; 1890 struct acpi_video_device *dev; 1891 int error; 1892 1893 video->input = input = input_allocate_device(); 1894 if (!input) { 1895 error = -ENOMEM; 1896 goto out; 1897 } 1898 1899 error = acpi_video_bus_start_devices(video); 1900 if (error) 1901 goto err_free_input; 1902 1903 snprintf(video->phys, sizeof(video->phys), 1904 "%s/video/input0", acpi_device_hid(video->device)); 1905 1906 input->name = acpi_device_name(video->device); 1907 input->phys = video->phys; 1908 input->id.bustype = BUS_HOST; 1909 input->id.product = 0x06; 1910 input->dev.parent = &video->device->dev; 1911 input->evbit[0] = BIT(EV_KEY); 1912 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1913 set_bit(KEY_VIDEO_NEXT, input->keybit); 1914 set_bit(KEY_VIDEO_PREV, input->keybit); 1915 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1916 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1917 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1918 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1919 set_bit(KEY_DISPLAY_OFF, input->keybit); 1920 1921 error = input_register_device(input); 1922 if (error) 1923 goto err_stop_dev; 1924 1925 mutex_lock(&video->device_list_lock); 1926 list_for_each_entry(dev, &video->video_device_list, entry) 1927 acpi_video_dev_add_notify_handler(dev); 1928 mutex_unlock(&video->device_list_lock); 1929 1930 return 0; 1931 1932 err_stop_dev: 1933 acpi_video_bus_stop_devices(video); 1934 err_free_input: 1935 input_free_device(input); 1936 video->input = NULL; 1937 out: 1938 return error; 1939 } 1940 1941 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1942 { 1943 if (dev->flags.notify) { 1944 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1945 acpi_video_device_notify); 1946 dev->flags.notify = 0; 1947 } 1948 } 1949 1950 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1951 { 1952 struct acpi_video_device *dev; 1953 1954 mutex_lock(&video->device_list_lock); 1955 list_for_each_entry(dev, &video->video_device_list, entry) 1956 acpi_video_dev_remove_notify_handler(dev); 1957 mutex_unlock(&video->device_list_lock); 1958 1959 acpi_video_bus_stop_devices(video); 1960 input_unregister_device(video->input); 1961 video->input = NULL; 1962 } 1963 1964 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1965 { 1966 struct acpi_video_device *dev, *next; 1967 1968 mutex_lock(&video->device_list_lock); 1969 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1970 list_del(&dev->entry); 1971 kfree(dev); 1972 } 1973 mutex_unlock(&video->device_list_lock); 1974 1975 return 0; 1976 } 1977 1978 static int instance; 1979 1980 static int acpi_video_bus_add(struct acpi_device *device) 1981 { 1982 struct acpi_video_bus *video; 1983 bool auto_detect; 1984 int error; 1985 acpi_status status; 1986 1987 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1988 acpi_dev_parent(device)->handle, 1, 1989 acpi_video_bus_match, NULL, 1990 device, NULL); 1991 if (status == AE_ALREADY_EXISTS) { 1992 pr_info(FW_BUG 1993 "Duplicate ACPI video bus devices for the" 1994 " same VGA controller, please try module " 1995 "parameter \"video.allow_duplicates=1\"" 1996 "if the current driver doesn't work.\n"); 1997 if (!allow_duplicates) 1998 return -ENODEV; 1999 } 2000 2001 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2002 if (!video) 2003 return -ENOMEM; 2004 2005 /* a hack to fix the duplicate name "VID" problem on T61 */ 2006 if (!strcmp(device->pnp.bus_id, "VID")) { 2007 if (instance) 2008 device->pnp.bus_id[3] = '0' + instance; 2009 instance++; 2010 } 2011 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2012 if (!strcmp(device->pnp.bus_id, "VGA")) { 2013 if (instance) 2014 device->pnp.bus_id[3] = '0' + instance; 2015 instance++; 2016 } 2017 2018 video->device = device; 2019 strscpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2020 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2021 device->driver_data = video; 2022 2023 acpi_video_bus_find_cap(video); 2024 error = acpi_video_bus_check(video); 2025 if (error) 2026 goto err_free_video; 2027 2028 mutex_init(&video->device_list_lock); 2029 INIT_LIST_HEAD(&video->video_device_list); 2030 2031 error = acpi_video_bus_get_devices(video, device); 2032 if (error) 2033 goto err_put_video; 2034 2035 /* 2036 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0 2037 * evaluated to have functional panel brightness control. 2038 */ 2039 acpi_device_fix_up_power_children(device); 2040 2041 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2042 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2043 str_yes_no(video->flags.multihead), 2044 str_yes_no(video->flags.rom), 2045 str_yes_no(video->flags.post)); 2046 mutex_lock(&video_list_lock); 2047 list_add_tail(&video->entry, &video_bus_head); 2048 mutex_unlock(&video_list_lock); 2049 2050 /* 2051 * If backlight-type auto-detection is used then a native backlight may 2052 * show up later and this may change the result from video to native. 2053 * Therefor normally the userspace visible /sys/class/backlight device 2054 * gets registered separately by the GPU driver calling 2055 * acpi_video_register_backlight() when an internal panel is detected. 2056 * Register the backlight now when not using auto-detection, so that 2057 * when the kernel cmdline or DMI-quirks are used the backlight will 2058 * get registered even if acpi_video_register_backlight() is not called. 2059 */ 2060 acpi_video_run_bcl_for_osi(video); 2061 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && 2062 !auto_detect) 2063 acpi_video_bus_register_backlight(video); 2064 2065 error = acpi_video_bus_add_notify_handler(video); 2066 if (error) 2067 goto err_del; 2068 2069 error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, 2070 acpi_video_bus_notify, device); 2071 if (error) 2072 goto err_remove; 2073 2074 return 0; 2075 2076 err_remove: 2077 acpi_video_bus_remove_notify_handler(video); 2078 err_del: 2079 mutex_lock(&video_list_lock); 2080 list_del(&video->entry); 2081 mutex_unlock(&video_list_lock); 2082 acpi_video_bus_unregister_backlight(video); 2083 err_put_video: 2084 acpi_video_bus_put_devices(video); 2085 kfree(video->attached_array); 2086 err_free_video: 2087 kfree(video); 2088 device->driver_data = NULL; 2089 2090 return error; 2091 } 2092 2093 static void acpi_video_bus_remove(struct acpi_device *device) 2094 { 2095 struct acpi_video_bus *video = NULL; 2096 2097 2098 if (!device || !acpi_driver_data(device)) 2099 return; 2100 2101 video = acpi_driver_data(device); 2102 2103 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, 2104 acpi_video_bus_notify); 2105 2106 mutex_lock(&video_list_lock); 2107 list_del(&video->entry); 2108 mutex_unlock(&video_list_lock); 2109 2110 acpi_video_bus_remove_notify_handler(video); 2111 acpi_video_bus_unregister_backlight(video); 2112 acpi_video_bus_put_devices(video); 2113 2114 kfree(video->attached_array); 2115 kfree(video); 2116 } 2117 2118 static int __init is_i740(struct pci_dev *dev) 2119 { 2120 if (dev->device == 0x00D1) 2121 return 1; 2122 if (dev->device == 0x7000) 2123 return 1; 2124 return 0; 2125 } 2126 2127 static int __init intel_opregion_present(void) 2128 { 2129 int opregion = 0; 2130 struct pci_dev *dev = NULL; 2131 u32 address; 2132 2133 for_each_pci_dev(dev) { 2134 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2135 continue; 2136 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2137 continue; 2138 /* We don't want to poke around undefined i740 registers */ 2139 if (is_i740(dev)) 2140 continue; 2141 pci_read_config_dword(dev, 0xfc, &address); 2142 if (!address) 2143 continue; 2144 opregion = 1; 2145 } 2146 return opregion; 2147 } 2148 2149 int acpi_video_register(void) 2150 { 2151 int ret = 0; 2152 2153 mutex_lock(®ister_count_mutex); 2154 if (register_count) { 2155 /* 2156 * if the function of acpi_video_register is already called, 2157 * don't register the acpi_video_bus again and return no error. 2158 */ 2159 goto leave; 2160 } 2161 2162 dmi_check_system(video_dmi_table); 2163 2164 ret = acpi_bus_register_driver(&acpi_video_bus); 2165 if (ret) 2166 goto leave; 2167 2168 /* 2169 * When the acpi_video_bus is loaded successfully, increase 2170 * the counter reference. 2171 */ 2172 register_count = 1; 2173 2174 leave: 2175 mutex_unlock(®ister_count_mutex); 2176 return ret; 2177 } 2178 EXPORT_SYMBOL(acpi_video_register); 2179 2180 void acpi_video_unregister(void) 2181 { 2182 mutex_lock(®ister_count_mutex); 2183 if (register_count) { 2184 acpi_bus_unregister_driver(&acpi_video_bus); 2185 register_count = 0; 2186 may_report_brightness_keys = false; 2187 } 2188 mutex_unlock(®ister_count_mutex); 2189 } 2190 EXPORT_SYMBOL(acpi_video_unregister); 2191 2192 void acpi_video_register_backlight(void) 2193 { 2194 struct acpi_video_bus *video; 2195 2196 mutex_lock(&video_list_lock); 2197 list_for_each_entry(video, &video_bus_head, entry) 2198 acpi_video_bus_register_backlight(video); 2199 mutex_unlock(&video_list_lock); 2200 } 2201 EXPORT_SYMBOL(acpi_video_register_backlight); 2202 2203 bool acpi_video_handles_brightness_key_presses(void) 2204 { 2205 return may_report_brightness_keys && 2206 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2207 } 2208 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2209 2210 /* 2211 * This is kind of nasty. Hardware using Intel chipsets may require 2212 * the video opregion code to be run first in order to initialise 2213 * state before any ACPI video calls are made. To handle this we defer 2214 * registration of the video class until the opregion code has run. 2215 */ 2216 2217 static int __init acpi_video_init(void) 2218 { 2219 /* 2220 * Let the module load even if ACPI is disabled (e.g. due to 2221 * a broken BIOS) so that i915.ko can still be loaded on such 2222 * old systems without an AcpiOpRegion. 2223 * 2224 * acpi_video_register() will report -ENODEV later as well due 2225 * to acpi_disabled when i915.ko tries to register itself afterwards. 2226 */ 2227 if (acpi_disabled) 2228 return 0; 2229 2230 if (intel_opregion_present()) 2231 return 0; 2232 2233 return acpi_video_register(); 2234 } 2235 2236 static void __exit acpi_video_exit(void) 2237 { 2238 acpi_video_unregister(); 2239 } 2240 2241 module_init(acpi_video_init); 2242 module_exit(acpi_video_exit); 2243