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/platform_device.h> 25 #include <linux/slab.h> 26 #include <linux/dmi.h> 27 #include <linux/suspend.h> 28 #include <linux/acpi.h> 29 #include <acpi/video.h> 30 #include <linux/uaccess.h> 31 #include <linux/string_choices.h> 32 33 #define ACPI_VIDEO_BUS_NAME "Video Bus" 34 #define ACPI_VIDEO_DEVICE_NAME "Video Device" 35 36 #define MAX_NAME_LEN 20 37 38 MODULE_AUTHOR("Bruno Ducrot"); 39 MODULE_DESCRIPTION("ACPI Video Driver"); 40 MODULE_LICENSE("GPL"); 41 42 static bool brightness_switch_enabled = true; 43 module_param(brightness_switch_enabled, bool, 0644); 44 45 /* 46 * By default, we don't allow duplicate ACPI video bus devices 47 * under the same VGA controller 48 */ 49 static bool allow_duplicates; 50 module_param(allow_duplicates, bool, 0644); 51 52 #define REPORT_OUTPUT_KEY_EVENTS 0x01 53 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 54 static int report_key_events = -1; 55 module_param(report_key_events, int, 0644); 56 MODULE_PARM_DESC(report_key_events, 57 "0: none, 1: output changes, 2: brightness changes, 3: all"); 58 59 static int hw_changes_brightness = -1; 60 module_param(hw_changes_brightness, int, 0644); 61 MODULE_PARM_DESC(hw_changes_brightness, 62 "Set this to 1 on buggy hw which changes the brightness itself when " 63 "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); 64 65 /* 66 * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be 67 * assumed even if not actually set. 68 */ 69 static bool device_id_scheme = false; 70 module_param(device_id_scheme, bool, 0444); 71 72 static int only_lcd; 73 module_param(only_lcd, int, 0444); 74 75 static bool may_report_brightness_keys; 76 static int register_count; 77 static DEFINE_MUTEX(register_count_mutex); 78 static DEFINE_MUTEX(video_list_lock); 79 static LIST_HEAD(video_bus_head); 80 static int acpi_video_bus_probe(struct platform_device *pdev); 81 static void acpi_video_bus_remove(struct platform_device *pdev); 82 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data); 83 84 /* 85 * Indices in the _BCL method response: the first two items are special, 86 * the rest are all supported levels. 87 * 88 * See page 575 of the ACPI spec 3.0 89 */ 90 enum acpi_video_level_idx { 91 ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ 92 ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ 93 ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ 94 }; 95 96 static const struct acpi_device_id video_device_ids[] = { 97 {ACPI_VIDEO_HID, 0}, 98 {"", 0}, 99 }; 100 MODULE_DEVICE_TABLE(acpi, video_device_ids); 101 102 static struct platform_driver acpi_video_bus = { 103 .probe = acpi_video_bus_probe, 104 .remove = acpi_video_bus_remove, 105 .driver = { 106 .name = "acpi-video", 107 .acpi_match_table = video_device_ids, 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 /* 653 * Some buggy implementations incorrectly return the EDID buffer in an ACPI package. 654 * In this case, extract the buffer from the package. 655 */ 656 if (obj && obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 1) 657 obj = &obj->package.elements[0]; 658 659 if (obj && obj->type == ACPI_TYPE_BUFFER) { 660 *edid = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL); 661 ret = *edid ? obj->buffer.length : -ENOMEM; 662 } else { 663 acpi_handle_debug(device->dev->handle, 664 "Invalid _DDC data for length %d\n", length); 665 ret = -EFAULT; 666 } 667 668 kfree(buffer.pointer); 669 return ret; 670 } 671 672 /* bus */ 673 674 /* 675 * Arg: 676 * video : video bus device pointer 677 * bios_flag : 678 * 0. The system BIOS should NOT automatically switch(toggle) 679 * the active display output. 680 * 1. The system BIOS should automatically switch (toggle) the 681 * active display output. No switch event. 682 * 2. The _DGS value should be locked. 683 * 3. The system BIOS should not automatically switch (toggle) the 684 * active display output, but instead generate the display switch 685 * event notify code. 686 * lcd_flag : 687 * 0. The system BIOS should automatically control the brightness level 688 * of the LCD when: 689 * - the power changes from AC to DC (ACPI appendix B) 690 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 691 * 1. The system BIOS should NOT automatically control the brightness 692 * level of the LCD when: 693 * - the power changes from AC to DC (ACPI appendix B) 694 * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) 695 * Return Value: 696 * -EINVAL wrong arg. 697 */ 698 699 static int 700 acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) 701 { 702 acpi_status status; 703 704 if (!video->cap._DOS) 705 return 0; 706 707 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) 708 return -EINVAL; 709 video->dos_setting = (lcd_flag << 2) | bios_flag; 710 status = acpi_execute_simple_method(video->device->handle, "_DOS", 711 (lcd_flag << 2) | bios_flag); 712 if (ACPI_FAILURE(status)) 713 return -EIO; 714 715 return 0; 716 } 717 718 /* 719 * Simple comparison function used to sort backlight levels. 720 */ 721 722 static int 723 acpi_video_cmp_level(const void *a, const void *b) 724 { 725 return *(int *)a - *(int *)b; 726 } 727 728 /* 729 * Decides if _BQC/_BCQ for this system is usable 730 * 731 * We do this by changing the level first and then read out the current 732 * brightness level, if the value does not match, find out if it is using 733 * index. If not, clear the _BQC/_BCQ capability. 734 */ 735 static int acpi_video_bqc_quirk(struct acpi_video_device *device, 736 int max_level, int current_level) 737 { 738 struct acpi_video_device_brightness *br = device->brightness; 739 int result; 740 unsigned long long level; 741 int test_level; 742 743 /* don't mess with existing known broken systems */ 744 if (bqc_offset_aml_bug_workaround) 745 return 0; 746 747 /* 748 * Some systems always report current brightness level as maximum 749 * through _BQC, we need to test another value for them. However, 750 * there is a subtlety: 751 * 752 * If the _BCL package ordering is descending, the first level 753 * (br->levels[2]) is likely to be 0, and if the number of levels 754 * matches the number of steps, we might confuse a returned level to 755 * mean the index. 756 * 757 * For example: 758 * 759 * current_level = max_level = 100 760 * test_level = 0 761 * returned level = 100 762 * 763 * In this case 100 means the level, not the index, and _BCM failed. 764 * Still, if the _BCL package ordering is descending, the index of 765 * level 0 is also 100, so we assume _BQC is indexed, when it's not. 766 * 767 * This causes all _BQC calls to return bogus values causing weird 768 * behavior from the user's perspective. For example: 769 * 770 * xbacklight -set 10; xbacklight -set 20; 771 * 772 * would flash to 90% and then slowly down to the desired level (20). 773 * 774 * The solution is simple; test anything other than the first level 775 * (e.g. 1). 776 */ 777 test_level = current_level == max_level 778 ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] 779 : max_level; 780 781 result = acpi_video_device_lcd_set_level(device, test_level); 782 if (result) 783 return result; 784 785 result = acpi_video_device_lcd_get_level_current(device, &level, true); 786 if (result) 787 return result; 788 789 if (level != test_level) { 790 /* buggy _BQC found, need to find out if it uses index */ 791 if (level < br->count) { 792 if (br->flags._BCL_reversed) 793 level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; 794 if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) 795 br->flags._BQC_use_index = 1; 796 } 797 798 if (!br->flags._BQC_use_index) 799 device->cap._BQC = device->cap._BCQ = 0; 800 } 801 802 return 0; 803 } 804 805 int acpi_video_get_levels(struct acpi_device *device, 806 struct acpi_video_device_brightness **dev_br, 807 int *pmax_level) 808 { 809 union acpi_object *obj = NULL; 810 int i, max_level = 0, count = 0, level_ac_battery = 0; 811 union acpi_object *o; 812 struct acpi_video_device_brightness *br = NULL; 813 int result = 0; 814 u32 value; 815 816 if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { 817 acpi_handle_debug(device->handle, 818 "Could not query available LCD brightness level\n"); 819 result = -ENODEV; 820 goto out; 821 } 822 823 if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { 824 result = -EINVAL; 825 goto out; 826 } 827 828 br = kzalloc(sizeof(*br), GFP_KERNEL); 829 if (!br) { 830 result = -ENOMEM; 831 goto out; 832 } 833 834 /* 835 * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), 836 * in order to account for buggy BIOS which don't export the first two 837 * special levels (see below) 838 */ 839 br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 840 sizeof(*br->levels), 841 GFP_KERNEL); 842 if (!br->levels) { 843 result = -ENOMEM; 844 goto out_free; 845 } 846 847 for (i = 0; i < obj->package.count; i++) { 848 o = (union acpi_object *)&obj->package.elements[i]; 849 if (o->type != ACPI_TYPE_INTEGER) { 850 acpi_handle_info(device->handle, "Invalid data\n"); 851 continue; 852 } 853 value = (u32) o->integer.value; 854 /* Skip duplicate entries */ 855 if (count > ACPI_VIDEO_FIRST_LEVEL 856 && br->levels[count - 1] == value) 857 continue; 858 859 br->levels[count] = value; 860 861 if (br->levels[count] > max_level) 862 max_level = br->levels[count]; 863 count++; 864 } 865 866 /* 867 * some buggy BIOS don't export the levels 868 * when machine is on AC/Battery in _BCL package. 869 * In this case, the first two elements in _BCL packages 870 * are also supported brightness levels that OS should take care of. 871 */ 872 for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { 873 if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) 874 level_ac_battery++; 875 if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) 876 level_ac_battery++; 877 } 878 879 if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { 880 level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; 881 br->flags._BCL_no_ac_battery_levels = 1; 882 for (i = (count - 1 + level_ac_battery); 883 i >= ACPI_VIDEO_FIRST_LEVEL; i--) 884 br->levels[i] = br->levels[i - level_ac_battery]; 885 count += level_ac_battery; 886 } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) 887 acpi_handle_info(device->handle, 888 "Too many duplicates in _BCL package"); 889 890 /* Check if the _BCL package is in a reversed order */ 891 if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { 892 br->flags._BCL_reversed = 1; 893 sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], 894 count - ACPI_VIDEO_FIRST_LEVEL, 895 sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), 896 acpi_video_cmp_level, NULL); 897 } else if (max_level != br->levels[count - 1]) 898 acpi_handle_info(device->handle, 899 "Found unordered _BCL package"); 900 901 br->count = count; 902 *dev_br = br; 903 if (pmax_level) 904 *pmax_level = max_level; 905 906 out: 907 kfree(obj); 908 return result; 909 out_free: 910 kfree(br); 911 goto out; 912 } 913 EXPORT_SYMBOL(acpi_video_get_levels); 914 915 /* 916 * Arg: 917 * device : video output device (LCD, CRT, ..) 918 * 919 * Return Value: 920 * Maximum brightness level 921 * 922 * Allocate and initialize device->brightness. 923 */ 924 925 static int 926 acpi_video_init_brightness(struct acpi_video_device *device) 927 { 928 int i, max_level = 0; 929 unsigned long long level, level_old; 930 struct acpi_video_device_brightness *br = NULL; 931 int result; 932 933 result = acpi_video_get_levels(device->dev, &br, &max_level); 934 if (result) 935 return result; 936 device->brightness = br; 937 938 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ 939 br->curr = level = max_level; 940 941 if (!device->cap._BQC) 942 goto set_level; 943 944 result = acpi_video_device_lcd_get_level_current(device, 945 &level_old, true); 946 if (result) 947 goto out_free_levels; 948 949 result = acpi_video_bqc_quirk(device, max_level, level_old); 950 if (result) 951 goto out_free_levels; 952 /* 953 * cap._BQC may get cleared due to _BQC is found to be broken 954 * in acpi_video_bqc_quirk, so check again here. 955 */ 956 if (!device->cap._BQC) 957 goto set_level; 958 959 level = acpi_video_bqc_value_to_level(device, level_old); 960 /* 961 * On some buggy laptops, _BQC returns an uninitialized 962 * value when invoked for the first time, i.e. 963 * level_old is invalid (no matter whether it's a level 964 * or an index). Set the backlight to max_level in this case. 965 */ 966 for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) 967 if (level == br->levels[i]) 968 break; 969 if (i == br->count || !level) 970 level = max_level; 971 972 set_level: 973 result = acpi_video_device_lcd_set_level(device, level); 974 if (result) 975 goto out_free_levels; 976 977 acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", 978 br->count - ACPI_VIDEO_FIRST_LEVEL); 979 980 return 0; 981 982 out_free_levels: 983 kfree(br->levels); 984 kfree(br); 985 device->brightness = NULL; 986 return result; 987 } 988 989 /* 990 * Arg: 991 * device : video output device (LCD, CRT, ..) 992 * 993 * Return Value: 994 * None 995 * 996 * Find out all required AML methods defined under the output 997 * device. 998 */ 999 1000 static void acpi_video_device_find_cap(struct acpi_video_device *device) 1001 { 1002 if (acpi_has_method(device->dev->handle, "_ADR")) 1003 device->cap._ADR = 1; 1004 if (acpi_has_method(device->dev->handle, "_BCL")) 1005 device->cap._BCL = 1; 1006 if (acpi_has_method(device->dev->handle, "_BCM")) 1007 device->cap._BCM = 1; 1008 if (acpi_has_method(device->dev->handle, "_BQC")) { 1009 device->cap._BQC = 1; 1010 } else if (acpi_has_method(device->dev->handle, "_BCQ")) { 1011 acpi_handle_info(device->dev->handle, 1012 "_BCQ is used instead of _BQC\n"); 1013 device->cap._BCQ = 1; 1014 } 1015 1016 if (acpi_has_method(device->dev->handle, "_DDC")) 1017 device->cap._DDC = 1; 1018 } 1019 1020 /* 1021 * Arg: 1022 * device : video output device (VGA) 1023 * 1024 * Return Value: 1025 * None 1026 * 1027 * Find out all required AML methods defined under the video bus device. 1028 */ 1029 1030 static void acpi_video_bus_find_cap(struct acpi_video_bus *video) 1031 { 1032 if (acpi_has_method(video->device->handle, "_DOS")) 1033 video->cap._DOS = 1; 1034 if (acpi_has_method(video->device->handle, "_DOD")) 1035 video->cap._DOD = 1; 1036 if (acpi_has_method(video->device->handle, "_ROM")) 1037 video->cap._ROM = 1; 1038 if (acpi_has_method(video->device->handle, "_GPD")) 1039 video->cap._GPD = 1; 1040 if (acpi_has_method(video->device->handle, "_SPD")) 1041 video->cap._SPD = 1; 1042 if (acpi_has_method(video->device->handle, "_VPO")) 1043 video->cap._VPO = 1; 1044 } 1045 1046 /* 1047 * Check whether the video bus device has required AML method to 1048 * support the desired features 1049 */ 1050 1051 static int acpi_video_bus_check(struct acpi_video_bus *video) 1052 { 1053 acpi_status status = -ENOENT; 1054 struct pci_dev *dev; 1055 1056 if (!video) 1057 return -EINVAL; 1058 1059 dev = acpi_get_pci_dev(video->device->handle); 1060 if (!dev) 1061 return -ENODEV; 1062 pci_dev_put(dev); 1063 1064 /* 1065 * Since there is no HID, CID and so on for VGA driver, we have 1066 * to check well known required nodes. 1067 */ 1068 1069 /* Does this device support video switching? */ 1070 if (video->cap._DOS || video->cap._DOD) { 1071 if (!video->cap._DOS) { 1072 pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", 1073 acpi_device_bid(video->device)); 1074 } 1075 video->flags.multihead = 1; 1076 status = 0; 1077 } 1078 1079 /* Does this device support retrieving a video ROM? */ 1080 if (video->cap._ROM) { 1081 video->flags.rom = 1; 1082 status = 0; 1083 } 1084 1085 /* Does this device support configuring which video device to POST? */ 1086 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { 1087 video->flags.post = 1; 1088 status = 0; 1089 } 1090 1091 return status; 1092 } 1093 1094 /* 1095 * -------------------------------------------------------------------------- 1096 * Driver Interface 1097 * -------------------------------------------------------------------------- 1098 */ 1099 1100 /* device interface */ 1101 static struct acpi_video_device_attrib * 1102 acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) 1103 { 1104 struct acpi_video_enumerated_device *ids; 1105 int i; 1106 1107 for (i = 0; i < video->attached_count; i++) { 1108 ids = &video->attached_array[i]; 1109 if ((ids->value.int_val & 0xffff) == device_id) 1110 return &ids->value.attrib; 1111 } 1112 1113 return NULL; 1114 } 1115 1116 static int 1117 acpi_video_get_device_type(struct acpi_video_bus *video, 1118 unsigned long device_id) 1119 { 1120 struct acpi_video_enumerated_device *ids; 1121 int i; 1122 1123 for (i = 0; i < video->attached_count; i++) { 1124 ids = &video->attached_array[i]; 1125 if ((ids->value.int_val & 0xffff) == device_id) 1126 return ids->value.int_val; 1127 } 1128 1129 return 0; 1130 } 1131 1132 static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) 1133 { 1134 struct acpi_video_bus *video = arg; 1135 struct acpi_video_device_attrib *attribute; 1136 struct acpi_video_device *data; 1137 int device_type; 1138 u64 device_id; 1139 1140 /* Skip devices without _ADR instead of failing. */ 1141 if (acpi_get_local_u64_address(device->handle, &device_id)) 1142 goto exit; 1143 1144 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); 1145 if (!data) { 1146 dev_dbg(&device->dev, "Cannot attach\n"); 1147 return -ENOMEM; 1148 } 1149 1150 strscpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); 1151 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 1152 1153 data->device_id = device_id; 1154 data->video = video; 1155 data->dev = device; 1156 INIT_DELAYED_WORK(&data->switch_brightness_work, 1157 acpi_video_switch_brightness); 1158 1159 attribute = acpi_video_get_device_attr(video, device_id); 1160 1161 if (attribute && (attribute->device_id_scheme || device_id_scheme)) { 1162 switch (attribute->display_type) { 1163 case ACPI_VIDEO_DISPLAY_CRT: 1164 data->flags.crt = 1; 1165 break; 1166 case ACPI_VIDEO_DISPLAY_TV: 1167 data->flags.tvout = 1; 1168 break; 1169 case ACPI_VIDEO_DISPLAY_DVI: 1170 data->flags.dvi = 1; 1171 break; 1172 case ACPI_VIDEO_DISPLAY_LCD: 1173 data->flags.lcd = 1; 1174 break; 1175 default: 1176 data->flags.unknown = 1; 1177 break; 1178 } 1179 if (attribute->bios_can_detect) 1180 data->flags.bios = 1; 1181 } else { 1182 /* Check for legacy IDs */ 1183 device_type = acpi_video_get_device_type(video, device_id); 1184 /* Ignore bits 16 and 18-20 */ 1185 switch (device_type & 0xffe2ffff) { 1186 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: 1187 data->flags.crt = 1; 1188 break; 1189 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: 1190 data->flags.lcd = 1; 1191 break; 1192 case ACPI_VIDEO_DISPLAY_LEGACY_TV: 1193 data->flags.tvout = 1; 1194 break; 1195 default: 1196 data->flags.unknown = 1; 1197 } 1198 } 1199 1200 acpi_video_device_bind(video, data); 1201 acpi_video_device_find_cap(data); 1202 1203 if (data->cap._BCM && data->cap._BCL) 1204 may_report_brightness_keys = true; 1205 1206 mutex_lock(&video->device_list_lock); 1207 list_add_tail(&data->entry, &video->video_device_list); 1208 mutex_unlock(&video->device_list_lock); 1209 1210 exit: 1211 video->child_count++; 1212 return 0; 1213 } 1214 1215 /* 1216 * Arg: 1217 * video : video bus device 1218 * 1219 * Return: 1220 * none 1221 * 1222 * Enumerate the video device list of the video bus, 1223 * bind the ids with the corresponding video devices 1224 * under the video bus. 1225 */ 1226 1227 static void acpi_video_device_rebind(struct acpi_video_bus *video) 1228 { 1229 struct acpi_video_device *dev; 1230 1231 mutex_lock(&video->device_list_lock); 1232 1233 list_for_each_entry(dev, &video->video_device_list, entry) 1234 acpi_video_device_bind(video, dev); 1235 1236 mutex_unlock(&video->device_list_lock); 1237 } 1238 1239 /* 1240 * Arg: 1241 * video : video bus device 1242 * device : video output device under the video 1243 * bus 1244 * 1245 * Return: 1246 * none 1247 * 1248 * Bind the ids with the corresponding video devices 1249 * under the video bus. 1250 */ 1251 1252 static void 1253 acpi_video_device_bind(struct acpi_video_bus *video, 1254 struct acpi_video_device *device) 1255 { 1256 struct acpi_video_enumerated_device *ids; 1257 int i; 1258 1259 for (i = 0; i < video->attached_count; i++) { 1260 ids = &video->attached_array[i]; 1261 if (device->device_id == (ids->value.int_val & 0xffff)) { 1262 ids->bind_info = device; 1263 acpi_handle_debug(video->device->handle, "%s: %d\n", 1264 __func__, i); 1265 } 1266 } 1267 } 1268 1269 static bool acpi_video_device_in_dod(struct acpi_video_device *device) 1270 { 1271 struct acpi_video_bus *video = device->video; 1272 int i; 1273 1274 /* 1275 * If we have a broken _DOD or we have more than 8 output devices 1276 * under the graphics controller node that we can't proper deal with 1277 * in the operation region code currently, no need to test. 1278 */ 1279 if (!video->attached_count || video->child_count > 8) 1280 return true; 1281 1282 for (i = 0; i < video->attached_count; i++) { 1283 if ((video->attached_array[i].value.int_val & 0xfff) == 1284 (device->device_id & 0xfff)) 1285 return true; 1286 } 1287 1288 return false; 1289 } 1290 1291 /* 1292 * Arg: 1293 * video : video bus device 1294 * 1295 * Return: 1296 * < 0 : error 1297 * 1298 * Call _DOD to enumerate all devices attached to display adapter 1299 * 1300 */ 1301 1302 static int acpi_video_device_enumerate(struct acpi_video_bus *video) 1303 { 1304 int status; 1305 int count; 1306 int i; 1307 struct acpi_video_enumerated_device *active_list; 1308 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1309 union acpi_object *dod = NULL; 1310 union acpi_object *obj; 1311 1312 if (!video->cap._DOD) 1313 return AE_NOT_EXIST; 1314 1315 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); 1316 if (ACPI_FAILURE(status)) { 1317 acpi_handle_info(video->device->handle, 1318 "_DOD evaluation failed: %s\n", 1319 acpi_format_exception(status)); 1320 return status; 1321 } 1322 1323 dod = buffer.pointer; 1324 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { 1325 acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); 1326 status = -EFAULT; 1327 goto out; 1328 } 1329 1330 acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", 1331 dod->package.count); 1332 1333 active_list = kcalloc(1 + dod->package.count, 1334 sizeof(struct acpi_video_enumerated_device), 1335 GFP_KERNEL); 1336 if (!active_list) { 1337 status = -ENOMEM; 1338 goto out; 1339 } 1340 1341 count = 0; 1342 for (i = 0; i < dod->package.count; i++) { 1343 obj = &dod->package.elements[i]; 1344 1345 if (obj->type != ACPI_TYPE_INTEGER) { 1346 acpi_handle_info(video->device->handle, 1347 "Invalid _DOD data in element %d\n", i); 1348 continue; 1349 } 1350 1351 active_list[count].value.int_val = obj->integer.value; 1352 active_list[count].bind_info = NULL; 1353 1354 acpi_handle_debug(video->device->handle, 1355 "_DOD element[%d] = %d\n", i, 1356 (int)obj->integer.value); 1357 1358 count++; 1359 } 1360 1361 kfree(video->attached_array); 1362 1363 video->attached_array = active_list; 1364 video->attached_count = count; 1365 1366 out: 1367 kfree(buffer.pointer); 1368 return status; 1369 } 1370 1371 static int 1372 acpi_video_get_next_level(struct acpi_video_device *device, 1373 u32 level_current, u32 event) 1374 { 1375 int min, max, min_above, max_below, i, l, delta = 255; 1376 max = max_below = 0; 1377 min = min_above = 255; 1378 /* Find closest level to level_current */ 1379 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1380 l = device->brightness->levels[i]; 1381 if (abs(l - level_current) < abs(delta)) { 1382 delta = l - level_current; 1383 if (!delta) 1384 break; 1385 } 1386 } 1387 /* Adjust level_current to closest available level */ 1388 level_current += delta; 1389 for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { 1390 l = device->brightness->levels[i]; 1391 if (l < min) 1392 min = l; 1393 if (l > max) 1394 max = l; 1395 if (l < min_above && l > level_current) 1396 min_above = l; 1397 if (l > max_below && l < level_current) 1398 max_below = l; 1399 } 1400 1401 switch (event) { 1402 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: 1403 return (level_current < max) ? min_above : min; 1404 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: 1405 return (level_current < max) ? min_above : max; 1406 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: 1407 return (level_current > min) ? max_below : min; 1408 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: 1409 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: 1410 return 0; 1411 default: 1412 return level_current; 1413 } 1414 } 1415 1416 static void 1417 acpi_video_switch_brightness(struct work_struct *work) 1418 { 1419 struct acpi_video_device *device = container_of(to_delayed_work(work), 1420 struct acpi_video_device, switch_brightness_work); 1421 unsigned long long level_current, level_next; 1422 int event = device->switch_brightness_event; 1423 int result = -EINVAL; 1424 1425 /* no warning message if acpi_backlight=vendor or a quirk is used */ 1426 if (!device->backlight) 1427 return; 1428 1429 if (!device->brightness) 1430 goto out; 1431 1432 result = acpi_video_device_lcd_get_level_current(device, 1433 &level_current, 1434 false); 1435 if (result) 1436 goto out; 1437 1438 level_next = acpi_video_get_next_level(device, level_current, event); 1439 1440 result = acpi_video_device_lcd_set_level(device, level_next); 1441 1442 if (!result) 1443 backlight_force_update(device->backlight, 1444 BACKLIGHT_UPDATE_HOTKEY); 1445 1446 out: 1447 if (result) 1448 acpi_handle_info(device->dev->handle, 1449 "Failed to switch brightness\n"); 1450 } 1451 1452 int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, 1453 void **edid) 1454 { 1455 struct acpi_video_bus *video; 1456 struct acpi_video_device *video_device; 1457 int i, length, ret; 1458 1459 if (!device || !acpi_driver_data(device)) 1460 return -EINVAL; 1461 1462 video = acpi_driver_data(device); 1463 1464 for (i = 0; i < video->attached_count; i++) { 1465 video_device = video->attached_array[i].bind_info; 1466 1467 if (!video_device) 1468 continue; 1469 1470 if (!video_device->cap._DDC) 1471 continue; 1472 1473 if (type) { 1474 switch (type) { 1475 case ACPI_VIDEO_DISPLAY_CRT: 1476 if (!video_device->flags.crt) 1477 continue; 1478 break; 1479 case ACPI_VIDEO_DISPLAY_TV: 1480 if (!video_device->flags.tvout) 1481 continue; 1482 break; 1483 case ACPI_VIDEO_DISPLAY_DVI: 1484 if (!video_device->flags.dvi) 1485 continue; 1486 break; 1487 case ACPI_VIDEO_DISPLAY_LCD: 1488 if (!video_device->flags.lcd) 1489 continue; 1490 break; 1491 } 1492 } else if (video_device->device_id != device_id) { 1493 continue; 1494 } 1495 1496 for (length = 512; length > 0; length -= 128) { 1497 ret = acpi_video_device_EDID(video_device, edid, length); 1498 if (ret > 0) 1499 return ret; 1500 } 1501 } 1502 1503 return -ENODEV; 1504 } 1505 EXPORT_SYMBOL(acpi_video_get_edid); 1506 1507 static int 1508 acpi_video_bus_get_devices(struct acpi_video_bus *video, 1509 struct acpi_device *device) 1510 { 1511 /* 1512 * There are systems where video module known to work fine regardless 1513 * of broken _DOD and ignoring returned value here doesn't cause 1514 * any issues later. 1515 */ 1516 acpi_video_device_enumerate(video); 1517 1518 return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); 1519 } 1520 1521 /* acpi_video interface */ 1522 1523 /* 1524 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't 1525 * perform any automatic brightness change on receiving a notification. 1526 */ 1527 static int acpi_video_bus_start_devices(struct acpi_video_bus *video) 1528 { 1529 return acpi_video_bus_DOS(video, 0, 1530 acpi_osi_is_win8() ? 1 : 0); 1531 } 1532 1533 static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) 1534 { 1535 return acpi_video_bus_DOS(video, 0, 1536 acpi_osi_is_win8() ? 0 : 1); 1537 } 1538 1539 static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data) 1540 { 1541 struct acpi_video_bus *video = data; 1542 struct acpi_device *device = video->device; 1543 struct input_dev *input; 1544 int keycode = 0; 1545 1546 input = video->input; 1547 1548 switch (event) { 1549 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, 1550 * most likely via hotkey. */ 1551 keycode = KEY_SWITCHVIDEOMODE; 1552 break; 1553 1554 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video 1555 * connector. */ 1556 acpi_video_device_enumerate(video); 1557 acpi_video_device_rebind(video); 1558 keycode = KEY_SWITCHVIDEOMODE; 1559 break; 1560 1561 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ 1562 keycode = KEY_SWITCHVIDEOMODE; 1563 break; 1564 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ 1565 keycode = KEY_VIDEO_NEXT; 1566 break; 1567 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ 1568 keycode = KEY_VIDEO_PREV; 1569 break; 1570 1571 default: 1572 acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", 1573 event); 1574 break; 1575 } 1576 1577 if (acpi_notifier_call_chain(device, event, 0)) 1578 /* Something vetoed the keypress. */ 1579 keycode = 0; 1580 1581 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { 1582 input_report_key(input, keycode, 1); 1583 input_sync(input); 1584 input_report_key(input, keycode, 0); 1585 input_sync(input); 1586 } 1587 } 1588 1589 static void brightness_switch_event(struct acpi_video_device *video_device, 1590 u32 event) 1591 { 1592 if (!brightness_switch_enabled) 1593 return; 1594 1595 video_device->switch_brightness_event = event; 1596 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); 1597 } 1598 1599 static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) 1600 { 1601 struct acpi_video_device *video_device = data; 1602 struct acpi_device *device = NULL; 1603 struct acpi_video_bus *bus; 1604 struct input_dev *input; 1605 int keycode = 0; 1606 1607 if (!video_device) 1608 return; 1609 1610 device = video_device->dev; 1611 bus = video_device->video; 1612 input = bus->input; 1613 1614 if (hw_changes_brightness > 0) { 1615 if (video_device->backlight) 1616 backlight_force_update(video_device->backlight, 1617 BACKLIGHT_UPDATE_HOTKEY); 1618 acpi_notifier_call_chain(device, event, 0); 1619 return; 1620 } 1621 1622 switch (event) { 1623 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ 1624 brightness_switch_event(video_device, event); 1625 keycode = KEY_BRIGHTNESS_CYCLE; 1626 break; 1627 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ 1628 brightness_switch_event(video_device, event); 1629 keycode = KEY_BRIGHTNESSUP; 1630 break; 1631 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ 1632 brightness_switch_event(video_device, event); 1633 keycode = KEY_BRIGHTNESSDOWN; 1634 break; 1635 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ 1636 brightness_switch_event(video_device, event); 1637 keycode = KEY_BRIGHTNESS_ZERO; 1638 break; 1639 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ 1640 brightness_switch_event(video_device, event); 1641 keycode = KEY_DISPLAY_OFF; 1642 break; 1643 default: 1644 acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); 1645 break; 1646 } 1647 1648 if (keycode) 1649 may_report_brightness_keys = true; 1650 1651 acpi_notifier_call_chain(device, event, 0); 1652 1653 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { 1654 input_report_key(input, keycode, 1); 1655 input_sync(input); 1656 input_report_key(input, keycode, 0); 1657 input_sync(input); 1658 } 1659 } 1660 1661 static int acpi_video_resume(struct notifier_block *nb, 1662 unsigned long val, void *ign) 1663 { 1664 struct acpi_video_bus *video; 1665 struct acpi_video_device *video_device; 1666 int i; 1667 1668 switch (val) { 1669 case PM_POST_HIBERNATION: 1670 case PM_POST_SUSPEND: 1671 case PM_POST_RESTORE: 1672 video = container_of(nb, struct acpi_video_bus, pm_nb); 1673 1674 dev_info(&video->device->dev, "Restoring backlight state\n"); 1675 1676 for (i = 0; i < video->attached_count; i++) { 1677 video_device = video->attached_array[i].bind_info; 1678 if (video_device && video_device->brightness) 1679 acpi_video_device_lcd_set_level(video_device, 1680 video_device->brightness->curr); 1681 } 1682 1683 return NOTIFY_OK; 1684 } 1685 return NOTIFY_DONE; 1686 } 1687 1688 static acpi_status 1689 acpi_video_bus_match(acpi_handle handle, u32 level, void *context, 1690 void **return_value) 1691 { 1692 struct acpi_device *device = context; 1693 struct acpi_device *sibling; 1694 1695 if (handle == device->handle) 1696 return AE_CTRL_TERMINATE; 1697 1698 sibling = acpi_fetch_acpi_dev(handle); 1699 if (!sibling) 1700 return AE_OK; 1701 1702 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) 1703 return AE_ALREADY_EXISTS; 1704 1705 return AE_OK; 1706 } 1707 1708 static void acpi_video_dev_register_backlight(struct acpi_video_device *device) 1709 { 1710 struct backlight_properties props; 1711 struct pci_dev *pdev; 1712 acpi_handle acpi_parent; 1713 struct device *parent = NULL; 1714 int result; 1715 static int count; 1716 char *name; 1717 1718 result = acpi_video_init_brightness(device); 1719 if (result) 1720 return; 1721 1722 name = kasprintf(GFP_KERNEL, "acpi_video%d", count); 1723 if (!name) 1724 return; 1725 count++; 1726 1727 if (ACPI_SUCCESS(acpi_get_parent(device->dev->handle, &acpi_parent))) { 1728 pdev = acpi_get_pci_dev(acpi_parent); 1729 if (pdev) { 1730 parent = &pdev->dev; 1731 pci_dev_put(pdev); 1732 } 1733 } 1734 1735 memset(&props, 0, sizeof(struct backlight_properties)); 1736 props.type = BACKLIGHT_FIRMWARE; 1737 props.max_brightness = 1738 device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; 1739 device->backlight = backlight_device_register(name, 1740 parent, 1741 device, 1742 &acpi_backlight_ops, 1743 &props); 1744 kfree(name); 1745 if (IS_ERR(device->backlight)) { 1746 device->backlight = NULL; 1747 return; 1748 } 1749 1750 /* 1751 * Save current brightness level in case we have to restore it 1752 * before acpi_video_device_lcd_set_level() is called next time. 1753 */ 1754 device->backlight->props.brightness = 1755 acpi_video_get_brightness(device->backlight); 1756 1757 device->cooling_dev = thermal_cooling_device_register("LCD", device, 1758 &video_cooling_ops); 1759 if (IS_ERR(device->cooling_dev)) { 1760 /* 1761 * Set cooling_dev to NULL so we don't crash trying to free it. 1762 * Also, why the hell we are returning early and not attempt to 1763 * register video output if cooling device registration failed? 1764 * -- dtor 1765 */ 1766 device->cooling_dev = NULL; 1767 return; 1768 } 1769 1770 dev_info(&device->dev->dev, "registered as cooling_device%d\n", 1771 device->cooling_dev->id); 1772 result = sysfs_create_link(&device->dev->dev.kobj, 1773 &device->cooling_dev->device.kobj, 1774 "thermal_cooling"); 1775 if (result) 1776 pr_info("sysfs link creation failed\n"); 1777 1778 result = sysfs_create_link(&device->cooling_dev->device.kobj, 1779 &device->dev->dev.kobj, "device"); 1780 if (result) 1781 pr_info("Reverse sysfs link creation failed\n"); 1782 } 1783 1784 static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) 1785 { 1786 struct acpi_video_device *dev; 1787 union acpi_object *levels; 1788 1789 mutex_lock(&video->device_list_lock); 1790 list_for_each_entry(dev, &video->video_device_list, entry) { 1791 if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) 1792 kfree(levels); 1793 } 1794 mutex_unlock(&video->device_list_lock); 1795 } 1796 1797 static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) 1798 { 1799 /* 1800 * Do not create backlight device for video output 1801 * device that is not in the enumerated list. 1802 */ 1803 if (!acpi_video_device_in_dod(dev)) { 1804 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); 1805 return false; 1806 } 1807 1808 if (only_lcd) 1809 return dev->flags.lcd; 1810 return true; 1811 } 1812 1813 static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) 1814 { 1815 struct acpi_video_device *dev; 1816 1817 if (video->backlight_registered) 1818 return 0; 1819 1820 if (acpi_video_get_backlight_type() != acpi_backlight_video) 1821 return 0; 1822 1823 mutex_lock(&video->device_list_lock); 1824 list_for_each_entry(dev, &video->video_device_list, entry) { 1825 if (acpi_video_should_register_backlight(dev)) 1826 acpi_video_dev_register_backlight(dev); 1827 } 1828 mutex_unlock(&video->device_list_lock); 1829 1830 video->backlight_registered = true; 1831 1832 video->pm_nb.notifier_call = acpi_video_resume; 1833 video->pm_nb.priority = 0; 1834 return register_pm_notifier(&video->pm_nb); 1835 } 1836 1837 static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) 1838 { 1839 if (device->backlight) { 1840 backlight_device_unregister(device->backlight); 1841 device->backlight = NULL; 1842 } 1843 if (device->brightness) { 1844 kfree(device->brightness->levels); 1845 kfree(device->brightness); 1846 device->brightness = NULL; 1847 } 1848 if (device->cooling_dev) { 1849 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); 1850 sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); 1851 thermal_cooling_device_unregister(device->cooling_dev); 1852 device->cooling_dev = NULL; 1853 } 1854 } 1855 1856 static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) 1857 { 1858 struct acpi_video_device *dev; 1859 int error; 1860 1861 if (!video->backlight_registered) 1862 return 0; 1863 1864 error = unregister_pm_notifier(&video->pm_nb); 1865 1866 mutex_lock(&video->device_list_lock); 1867 list_for_each_entry(dev, &video->video_device_list, entry) 1868 acpi_video_dev_unregister_backlight(dev); 1869 mutex_unlock(&video->device_list_lock); 1870 1871 video->backlight_registered = false; 1872 1873 return error; 1874 } 1875 1876 static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) 1877 { 1878 acpi_status status; 1879 struct acpi_device *adev = device->dev; 1880 1881 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 1882 acpi_video_device_notify, device); 1883 if (ACPI_FAILURE(status)) 1884 dev_err(&adev->dev, "Error installing notify handler\n"); 1885 else 1886 device->flags.notify = 1; 1887 } 1888 1889 static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video, 1890 struct platform_device *pdev) 1891 { 1892 struct input_dev *input; 1893 struct acpi_video_device *dev; 1894 int error; 1895 1896 video->input = input = input_allocate_device(); 1897 if (!input) { 1898 error = -ENOMEM; 1899 goto out; 1900 } 1901 1902 error = acpi_video_bus_start_devices(video); 1903 if (error) 1904 goto err_free_input; 1905 1906 snprintf(video->phys, sizeof(video->phys), 1907 "%s/video/input0", acpi_device_hid(video->device)); 1908 1909 input->name = acpi_device_name(video->device); 1910 input->phys = video->phys; 1911 input->id.bustype = BUS_HOST; 1912 input->id.product = 0x06; 1913 input->dev.parent = &pdev->dev; 1914 input->evbit[0] = BIT(EV_KEY); 1915 set_bit(KEY_SWITCHVIDEOMODE, input->keybit); 1916 set_bit(KEY_VIDEO_NEXT, input->keybit); 1917 set_bit(KEY_VIDEO_PREV, input->keybit); 1918 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); 1919 set_bit(KEY_BRIGHTNESSUP, input->keybit); 1920 set_bit(KEY_BRIGHTNESSDOWN, input->keybit); 1921 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); 1922 set_bit(KEY_DISPLAY_OFF, input->keybit); 1923 1924 error = input_register_device(input); 1925 if (error) 1926 goto err_stop_dev; 1927 1928 mutex_lock(&video->device_list_lock); 1929 list_for_each_entry(dev, &video->video_device_list, entry) 1930 acpi_video_dev_add_notify_handler(dev); 1931 mutex_unlock(&video->device_list_lock); 1932 1933 return 0; 1934 1935 err_stop_dev: 1936 acpi_video_bus_stop_devices(video); 1937 err_free_input: 1938 input_free_device(input); 1939 video->input = NULL; 1940 out: 1941 return error; 1942 } 1943 1944 static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) 1945 { 1946 if (dev->flags.notify) { 1947 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, 1948 acpi_video_device_notify); 1949 dev->flags.notify = 0; 1950 } 1951 } 1952 1953 static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) 1954 { 1955 struct acpi_video_device *dev; 1956 1957 mutex_lock(&video->device_list_lock); 1958 list_for_each_entry(dev, &video->video_device_list, entry) { 1959 acpi_video_dev_remove_notify_handler(dev); 1960 cancel_delayed_work_sync(&dev->switch_brightness_work); 1961 } 1962 mutex_unlock(&video->device_list_lock); 1963 1964 acpi_video_bus_stop_devices(video); 1965 input_unregister_device(video->input); 1966 video->input = NULL; 1967 } 1968 1969 static int acpi_video_bus_put_devices(struct acpi_video_bus *video) 1970 { 1971 struct acpi_video_device *dev, *next; 1972 1973 mutex_lock(&video->device_list_lock); 1974 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { 1975 list_del(&dev->entry); 1976 kfree(dev); 1977 } 1978 mutex_unlock(&video->device_list_lock); 1979 1980 return 0; 1981 } 1982 1983 static int instance; 1984 1985 static int acpi_video_bus_probe(struct platform_device *pdev) 1986 { 1987 struct acpi_device *device = ACPI_COMPANION(&pdev->dev); 1988 struct acpi_video_bus *video; 1989 bool auto_detect; 1990 int error; 1991 acpi_status status; 1992 1993 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, 1994 acpi_dev_parent(device)->handle, 1, 1995 acpi_video_bus_match, NULL, 1996 device, NULL); 1997 if (status == AE_ALREADY_EXISTS) { 1998 pr_info(FW_BUG 1999 "Duplicate ACPI video bus devices for the" 2000 " same VGA controller, please try module " 2001 "parameter \"video.allow_duplicates=1\"" 2002 "if the current driver doesn't work.\n"); 2003 if (!allow_duplicates) 2004 return -ENODEV; 2005 } 2006 2007 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); 2008 if (!video) 2009 return -ENOMEM; 2010 2011 /* a hack to fix the duplicate name "VID" problem on T61 */ 2012 if (!strcmp(device->pnp.bus_id, "VID")) { 2013 if (instance) 2014 device->pnp.bus_id[3] = '0' + instance; 2015 instance++; 2016 } 2017 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ 2018 if (!strcmp(device->pnp.bus_id, "VGA")) { 2019 if (instance) 2020 device->pnp.bus_id[3] = '0' + instance; 2021 instance++; 2022 } 2023 2024 platform_set_drvdata(pdev, video); 2025 2026 video->device = device; 2027 strscpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); 2028 strscpy(acpi_device_class(device), ACPI_VIDEO_CLASS); 2029 device->driver_data = video; 2030 2031 acpi_video_bus_find_cap(video); 2032 error = acpi_video_bus_check(video); 2033 if (error) 2034 goto err_free_video; 2035 2036 mutex_init(&video->device_list_lock); 2037 INIT_LIST_HEAD(&video->video_device_list); 2038 2039 error = acpi_video_bus_get_devices(video, device); 2040 if (error) 2041 goto err_put_video; 2042 2043 /* 2044 * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0 2045 * evaluated to have functional panel brightness control. 2046 */ 2047 acpi_device_fix_up_power_children(device); 2048 2049 pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", 2050 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), 2051 str_yes_no(video->flags.multihead), 2052 str_yes_no(video->flags.rom), 2053 str_yes_no(video->flags.post)); 2054 mutex_lock(&video_list_lock); 2055 list_add_tail(&video->entry, &video_bus_head); 2056 mutex_unlock(&video_list_lock); 2057 2058 /* 2059 * If backlight-type auto-detection is used then a native backlight may 2060 * show up later and this may change the result from video to native. 2061 * Therefor normally the userspace visible /sys/class/backlight device 2062 * gets registered separately by the GPU driver calling 2063 * acpi_video_register_backlight() when an internal panel is detected. 2064 * Register the backlight now when not using auto-detection, so that 2065 * when the kernel cmdline or DMI-quirks are used the backlight will 2066 * get registered even if acpi_video_register_backlight() is not called. 2067 */ 2068 acpi_video_run_bcl_for_osi(video); 2069 if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && 2070 !auto_detect) 2071 acpi_video_bus_register_backlight(video); 2072 2073 error = acpi_video_bus_add_notify_handler(video, pdev); 2074 if (error) 2075 goto err_del; 2076 2077 error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY, 2078 acpi_video_bus_notify, video); 2079 if (error) 2080 goto err_remove; 2081 2082 return 0; 2083 2084 err_remove: 2085 acpi_video_bus_remove_notify_handler(video); 2086 err_del: 2087 mutex_lock(&video_list_lock); 2088 list_del(&video->entry); 2089 mutex_unlock(&video_list_lock); 2090 acpi_video_bus_unregister_backlight(video); 2091 err_put_video: 2092 acpi_video_bus_put_devices(video); 2093 kfree(video->attached_array); 2094 err_free_video: 2095 kfree(video); 2096 device->driver_data = NULL; 2097 2098 return error; 2099 } 2100 2101 static void acpi_video_bus_remove(struct platform_device *pdev) 2102 { 2103 struct acpi_video_bus *video = platform_get_drvdata(pdev); 2104 struct acpi_device *device = ACPI_COMPANION(&pdev->dev); 2105 2106 acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY, 2107 acpi_video_bus_notify); 2108 2109 mutex_lock(&video_list_lock); 2110 list_del(&video->entry); 2111 mutex_unlock(&video_list_lock); 2112 2113 acpi_video_bus_remove_notify_handler(video); 2114 acpi_video_bus_unregister_backlight(video); 2115 acpi_video_bus_put_devices(video); 2116 2117 kfree(video->attached_array); 2118 kfree(video); 2119 } 2120 2121 static int __init is_i740(struct pci_dev *dev) 2122 { 2123 if (dev->device == 0x00D1) 2124 return 1; 2125 if (dev->device == 0x7000) 2126 return 1; 2127 return 0; 2128 } 2129 2130 static int __init intel_opregion_present(void) 2131 { 2132 int opregion = 0; 2133 struct pci_dev *dev = NULL; 2134 u32 address; 2135 2136 for_each_pci_dev(dev) { 2137 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) 2138 continue; 2139 if (dev->vendor != PCI_VENDOR_ID_INTEL) 2140 continue; 2141 /* We don't want to poke around undefined i740 registers */ 2142 if (is_i740(dev)) 2143 continue; 2144 pci_read_config_dword(dev, 0xfc, &address); 2145 if (!address) 2146 continue; 2147 opregion = 1; 2148 } 2149 return opregion; 2150 } 2151 2152 int acpi_video_register(void) 2153 { 2154 int ret = 0; 2155 2156 mutex_lock(®ister_count_mutex); 2157 if (register_count) { 2158 /* 2159 * if the function of acpi_video_register is already called, 2160 * don't register the acpi_video_bus again and return no error. 2161 */ 2162 goto leave; 2163 } 2164 2165 dmi_check_system(video_dmi_table); 2166 2167 ret = platform_driver_register(&acpi_video_bus); 2168 if (ret) 2169 goto leave; 2170 2171 /* 2172 * When the acpi_video_bus is loaded successfully, increase 2173 * the counter reference. 2174 */ 2175 register_count = 1; 2176 2177 leave: 2178 mutex_unlock(®ister_count_mutex); 2179 return ret; 2180 } 2181 EXPORT_SYMBOL(acpi_video_register); 2182 2183 void acpi_video_unregister(void) 2184 { 2185 mutex_lock(®ister_count_mutex); 2186 if (register_count) { 2187 platform_driver_unregister(&acpi_video_bus); 2188 register_count = 0; 2189 may_report_brightness_keys = false; 2190 } 2191 mutex_unlock(®ister_count_mutex); 2192 } 2193 EXPORT_SYMBOL(acpi_video_unregister); 2194 2195 void acpi_video_register_backlight(void) 2196 { 2197 struct acpi_video_bus *video; 2198 2199 mutex_lock(&video_list_lock); 2200 list_for_each_entry(video, &video_bus_head, entry) 2201 acpi_video_bus_register_backlight(video); 2202 mutex_unlock(&video_list_lock); 2203 } 2204 EXPORT_SYMBOL(acpi_video_register_backlight); 2205 2206 bool acpi_video_handles_brightness_key_presses(void) 2207 { 2208 return may_report_brightness_keys && 2209 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); 2210 } 2211 EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); 2212 2213 /* 2214 * This is kind of nasty. Hardware using Intel chipsets may require 2215 * the video opregion code to be run first in order to initialise 2216 * state before any ACPI video calls are made. To handle this we defer 2217 * registration of the video class until the opregion code has run. 2218 */ 2219 2220 static int __init acpi_video_init(void) 2221 { 2222 /* 2223 * Let the module load even if ACPI is disabled (e.g. due to 2224 * a broken BIOS) so that i915.ko can still be loaded on such 2225 * old systems without an AcpiOpRegion. 2226 * 2227 * acpi_video_register() will report -ENODEV later as well due 2228 * to acpi_disabled when i915.ko tries to register itself afterwards. 2229 */ 2230 if (acpi_disabled) 2231 return 0; 2232 2233 if (intel_opregion_present()) 2234 return 0; 2235 2236 return acpi_video_register(); 2237 } 2238 2239 static void __exit acpi_video_exit(void) 2240 { 2241 acpi_video_unregister(); 2242 } 2243 2244 module_init(acpi_video_init); 2245 module_exit(acpi_video_exit); 2246