1/* 2 * Copyright (C) 2015 Red Hat Inc. 3 * Hans de Goede <hdegoede@redhat.com> 4 * Copyright (C) 2008 SuSE Linux Products GmbH 5 * Thomas Renninger <trenn@suse.de> 6 * 7 * May be copied or modified under the terms of the GNU General Public License 8 * 9 * video_detect.c: 10 * After PCI devices are glued with ACPI devices 11 * acpi_get_pci_dev() can be called to identify ACPI graphics 12 * devices for which a real graphics card is plugged in 13 * 14 * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B) 15 * are available, video.ko should be used to handle the device. 16 * 17 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop, 18 * sony_acpi,... can take care about backlight brightness. 19 * 20 * Backlight drivers can use acpi_video_get_backlight_type() to determine 21 * which driver should handle the backlight. 22 * 23 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m) 24 * this file will not be compiled and acpi_video_get_backlight_type() will 25 * always return acpi_backlight_vendor. 26 */ 27 28#include <linux/export.h> 29#include <linux/acpi.h> 30#include <linux/backlight.h> 31#include <linux/dmi.h> 32#include <linux/module.h> 33#include <linux/pci.h> 34#include <linux/types.h> 35#include <linux/workqueue.h> 36#include <acpi/video.h> 37 38void acpi_video_unregister_backlight(void); 39 40static bool backlight_notifier_registered; 41static struct notifier_block backlight_nb; 42static struct work_struct backlight_notify_work; 43 44static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; 45static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; 46 47static void acpi_video_parse_cmdline(void) 48{ 49 if (!strcmp("vendor", acpi_video_backlight_string)) 50 acpi_backlight_cmdline = acpi_backlight_vendor; 51 if (!strcmp("video", acpi_video_backlight_string)) 52 acpi_backlight_cmdline = acpi_backlight_video; 53 if (!strcmp("native", acpi_video_backlight_string)) 54 acpi_backlight_cmdline = acpi_backlight_native; 55 if (!strcmp("none", acpi_video_backlight_string)) 56 acpi_backlight_cmdline = acpi_backlight_none; 57} 58 59static acpi_status 60find_video(acpi_handle handle, u32 lvl, void *context, void **rv) 61{ 62 long *cap = context; 63 struct pci_dev *dev; 64 struct acpi_device *acpi_dev; 65 66 static const struct acpi_device_id video_ids[] = { 67 {ACPI_VIDEO_HID, 0}, 68 {"", 0}, 69 }; 70 if (acpi_bus_get_device(handle, &acpi_dev)) 71 return AE_OK; 72 73 if (!acpi_match_device_ids(acpi_dev, video_ids)) { 74 dev = acpi_get_pci_dev(handle); 75 if (!dev) 76 return AE_OK; 77 pci_dev_put(dev); 78 *cap |= acpi_is_video_device(handle); 79 } 80 return AE_OK; 81} 82 83/* Force to use vendor driver when the ACPI device is known to be 84 * buggy */ 85static int video_detect_force_vendor(const struct dmi_system_id *d) 86{ 87 acpi_backlight_dmi = acpi_backlight_vendor; 88 return 0; 89} 90 91static int video_detect_force_video(const struct dmi_system_id *d) 92{ 93 acpi_backlight_dmi = acpi_backlight_video; 94 return 0; 95} 96 97static int video_detect_force_native(const struct dmi_system_id *d) 98{ 99 acpi_backlight_dmi = acpi_backlight_native; 100 return 0; 101} 102 103static int video_detect_force_none(const struct dmi_system_id *d) 104{ 105 acpi_backlight_dmi = acpi_backlight_none; 106 return 0; 107} 108 109static const struct dmi_system_id video_detect_dmi_table[] = { 110 /* On Samsung X360, the BIOS will set a flag (VDRV) if generic 111 * ACPI backlight device is used. This flag will definitively break 112 * the backlight interface (even the vendor interface) until next 113 * reboot. It's why we should prevent video.ko from being used here 114 * and we can't rely on a later call to acpi_video_unregister(). 115 */ 116 { 117 .callback = video_detect_force_vendor, 118 .ident = "X360", 119 .matches = { 120 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 121 DMI_MATCH(DMI_PRODUCT_NAME, "X360"), 122 DMI_MATCH(DMI_BOARD_NAME, "X360"), 123 }, 124 }, 125 { 126 .callback = video_detect_force_vendor, 127 .ident = "Asus UL30VT", 128 .matches = { 129 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 130 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), 131 }, 132 }, 133 { 134 .callback = video_detect_force_vendor, 135 .ident = "Asus UL30A", 136 .matches = { 137 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 138 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), 139 }, 140 }, 141 { 142 .callback = video_detect_force_vendor, 143 .ident = "GIGABYTE GB-BXBT-2807", 144 .matches = { 145 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), 146 DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"), 147 }, 148 }, 149 { 150 .callback = video_detect_force_vendor, 151 .ident = "Sony VPCEH3U1E", 152 .matches = { 153 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 154 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), 155 }, 156 }, 157 158 /* 159 * These models have a working acpi_video backlight control, and using 160 * native backlight causes a regression where backlight does not work 161 * when userspace is not handling brightness key events. Disable 162 * native_backlight on these to fix this: 163 * https://bugzilla.kernel.org/show_bug.cgi?id=81691 164 */ 165 { 166 .callback = video_detect_force_video, 167 .ident = "ThinkPad T420", 168 .matches = { 169 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 170 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), 171 }, 172 }, 173 { 174 .callback = video_detect_force_video, 175 .ident = "ThinkPad T520", 176 .matches = { 177 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 178 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), 179 }, 180 }, 181 { 182 .callback = video_detect_force_video, 183 .ident = "ThinkPad X201s", 184 .matches = { 185 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 186 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), 187 }, 188 }, 189 { 190 .callback = video_detect_force_video, 191 .ident = "ThinkPad X201T", 192 .matches = { 193 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 194 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), 195 }, 196 }, 197 198 /* The native backlight controls do not work on some older machines */ 199 { 200 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ 201 .callback = video_detect_force_video, 202 .ident = "HP ENVY 15 Notebook", 203 .matches = { 204 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 205 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), 206 }, 207 }, 208 { 209 .callback = video_detect_force_video, 210 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E", 211 .matches = { 212 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 213 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), 214 }, 215 }, 216 { 217 .callback = video_detect_force_video, 218 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V", 219 .matches = { 220 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 221 DMI_MATCH(DMI_PRODUCT_NAME, 222 "370R4E/370R4V/370R5E/3570RE/370R5V"), 223 }, 224 }, 225 { 226 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ 227 .callback = video_detect_force_video, 228 .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV", 229 .matches = { 230 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 231 DMI_MATCH(DMI_PRODUCT_NAME, 232 "3570R/370R/470R/450R/510R/4450RV"), 233 }, 234 }, 235 { 236 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ 237 .callback = video_detect_force_video, 238 .ident = "SAMSUNG 670Z5E", 239 .matches = { 240 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 241 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), 242 }, 243 }, 244 { 245 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ 246 .callback = video_detect_force_video, 247 .ident = "SAMSUNG 730U3E/740U3E", 248 .matches = { 249 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 250 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), 251 }, 252 }, 253 { 254 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ 255 .callback = video_detect_force_video, 256 .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D", 257 .matches = { 258 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 259 DMI_MATCH(DMI_PRODUCT_NAME, 260 "900X3C/900X3D/900X3E/900X4C/900X4D"), 261 }, 262 }, 263 { 264 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ 265 .callback = video_detect_force_video, 266 .ident = "Dell XPS14 L421X", 267 .matches = { 268 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 269 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 270 }, 271 }, 272 { 273 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ 274 .callback = video_detect_force_video, 275 .ident = "Dell XPS15 L521X", 276 .matches = { 277 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 278 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), 279 }, 280 }, 281 { 282 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ 283 .callback = video_detect_force_video, 284 .ident = "SAMSUNG 530U4E/540U4E", 285 .matches = { 286 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 287 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), 288 }, 289 }, 290 /* https://bugs.launchpad.net/bugs/1894667 */ 291 { 292 .callback = video_detect_force_video, 293 .ident = "HP 635 Notebook", 294 .matches = { 295 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 296 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), 297 }, 298 }, 299 300 /* Non win8 machines which need native backlight nevertheless */ 301 { 302 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ 303 .callback = video_detect_force_native, 304 .ident = "Lenovo Ideapad S405", 305 .matches = { 306 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 307 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), 308 }, 309 }, 310 { 311 /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */ 312 .callback = video_detect_force_native, 313 /* Lenovo Ideapad Z470 */ 314 .matches = { 315 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 316 DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"), 317 }, 318 }, 319 { 320 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ 321 .callback = video_detect_force_native, 322 .ident = "Lenovo Ideapad Z570", 323 .matches = { 324 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 325 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"), 326 }, 327 }, 328 { 329 .callback = video_detect_force_native, 330 .ident = "Lenovo E41-25", 331 .matches = { 332 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 333 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), 334 }, 335 }, 336 { 337 .callback = video_detect_force_native, 338 .ident = "Lenovo E41-45", 339 .matches = { 340 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 341 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), 342 }, 343 }, 344 { 345 .callback = video_detect_force_native, 346 /* Lenovo ThinkPad X131e (3371 AMD version) */ 347 .matches = { 348 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 349 DMI_MATCH(DMI_PRODUCT_NAME, "3371"), 350 }, 351 }, 352 { 353 .callback = video_detect_force_native, 354 /* Apple iMac11,3 */ 355 .matches = { 356 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 357 DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"), 358 }, 359 }, 360 { 361 /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */ 362 .callback = video_detect_force_native, 363 /* Apple iMac12,1 */ 364 .matches = { 365 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 366 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"), 367 }, 368 }, 369 { 370 /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */ 371 .callback = video_detect_force_native, 372 /* Apple iMac12,2 */ 373 .matches = { 374 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 375 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"), 376 }, 377 }, 378 { 379 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ 380 .callback = video_detect_force_native, 381 .ident = "Apple MacBook Pro 12,1", 382 .matches = { 383 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 384 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), 385 }, 386 }, 387 { 388 .callback = video_detect_force_native, 389 .ident = "Dell Vostro V131", 390 .matches = { 391 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 392 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 393 }, 394 }, 395 { 396 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ 397 .callback = video_detect_force_native, 398 .ident = "Dell XPS 17 L702X", 399 .matches = { 400 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 401 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), 402 }, 403 }, 404 { 405 .callback = video_detect_force_native, 406 .ident = "Dell Precision 7510", 407 .matches = { 408 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 409 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 410 }, 411 }, 412 { 413 .callback = video_detect_force_native, 414 .ident = "Acer Aspire 5738z", 415 .matches = { 416 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 417 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), 418 DMI_MATCH(DMI_BOARD_NAME, "JV50"), 419 }, 420 }, 421 { 422 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ 423 .callback = video_detect_force_native, 424 .ident = "Acer TravelMate 5735Z", 425 .matches = { 426 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 427 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), 428 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), 429 }, 430 }, 431 { 432 .callback = video_detect_force_native, 433 .ident = "ASUSTeK COMPUTER INC. GA401", 434 .matches = { 435 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 436 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"), 437 }, 438 }, 439 { 440 .callback = video_detect_force_native, 441 .ident = "ASUSTeK COMPUTER INC. GA502", 442 .matches = { 443 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 444 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"), 445 }, 446 }, 447 { 448 .callback = video_detect_force_native, 449 .ident = "ASUSTeK COMPUTER INC. GA503", 450 .matches = { 451 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 452 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"), 453 }, 454 }, 455 /* 456 * Clevo NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2 have both a 457 * working native and video interface. However the default detection 458 * mechanism first registers the video interface before unregistering 459 * it again and switching to the native interface during boot. This 460 * results in a dangling SBIOS request for backlight change for some 461 * reason, causing the backlight to switch to ~2% once per boot on the 462 * first power cord connect or disconnect event. Setting the native 463 * interface explicitly circumvents this buggy behaviour, by avoiding 464 * the unregistering process. 465 */ 466 { 467 .callback = video_detect_force_native, 468 .ident = "Clevo NL5xRU", 469 .matches = { 470 DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"), 471 }, 472 }, 473 { 474 .callback = video_detect_force_native, 475 .ident = "Clevo NL5xRU", 476 .matches = { 477 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 478 DMI_MATCH(DMI_BOARD_NAME, "AURA1501"), 479 }, 480 }, 481 { 482 .callback = video_detect_force_native, 483 .ident = "Clevo NL5xRU", 484 .matches = { 485 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 486 DMI_MATCH(DMI_BOARD_NAME, "EDUBOOK1502"), 487 }, 488 }, 489 { 490 .callback = video_detect_force_native, 491 .ident = "Clevo NL5xNU", 492 .matches = { 493 DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"), 494 }, 495 }, 496 /* 497 * The TongFang PF5PU1G, PF4NU1F, PF5NU1G, and PF5LUXG/TUXEDO BA15 Gen10, 498 * Pulse 14/15 Gen1, and Pulse 15 Gen2 have the same problem as the Clevo 499 * NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2. See the description 500 * above. 501 */ 502 { 503 .callback = video_detect_force_native, 504 .ident = "TongFang PF5PU1G", 505 .matches = { 506 DMI_MATCH(DMI_BOARD_NAME, "PF5PU1G"), 507 }, 508 }, 509 { 510 .callback = video_detect_force_native, 511 .ident = "TongFang PF4NU1F", 512 .matches = { 513 DMI_MATCH(DMI_BOARD_NAME, "PF4NU1F"), 514 }, 515 }, 516 { 517 .callback = video_detect_force_native, 518 .ident = "TongFang PF4NU1F", 519 .matches = { 520 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 521 DMI_MATCH(DMI_BOARD_NAME, "PULSE1401"), 522 }, 523 }, 524 { 525 .callback = video_detect_force_native, 526 .ident = "TongFang PF5NU1G", 527 .matches = { 528 DMI_MATCH(DMI_BOARD_NAME, "PF5NU1G"), 529 }, 530 }, 531 { 532 .callback = video_detect_force_native, 533 .ident = "TongFang PF5NU1G", 534 .matches = { 535 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 536 DMI_MATCH(DMI_BOARD_NAME, "PULSE1501"), 537 }, 538 }, 539 { 540 .callback = video_detect_force_native, 541 .ident = "TongFang PF5LUXG", 542 .matches = { 543 DMI_MATCH(DMI_BOARD_NAME, "PF5LUXG"), 544 }, 545 }, 546 /* 547 * More Tongfang devices with the same issue as the Clevo NL5xRU and 548 * NL5xNU/TUXEDO Aura 15 Gen1 and Gen2. See the description above. 549 */ 550 { 551 .callback = video_detect_force_native, 552 .ident = "TongFang GKxNRxx", 553 .matches = { 554 DMI_MATCH(DMI_BOARD_NAME, "GKxNRxx"), 555 }, 556 }, 557 { 558 .callback = video_detect_force_native, 559 .ident = "TongFang GKxNRxx", 560 .matches = { 561 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 562 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1501A1650TI"), 563 }, 564 }, 565 { 566 .callback = video_detect_force_native, 567 .ident = "TongFang GKxNRxx", 568 .matches = { 569 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 570 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1501A2060"), 571 }, 572 }, 573 { 574 .callback = video_detect_force_native, 575 .ident = "TongFang GKxNRxx", 576 .matches = { 577 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 578 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1701A1650TI"), 579 }, 580 }, 581 { 582 .callback = video_detect_force_native, 583 .ident = "TongFang GKxNRxx", 584 .matches = { 585 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"), 586 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1701A2060"), 587 }, 588 }, 589 { 590 .callback = video_detect_force_native, 591 .ident = "TongFang GMxNGxx", 592 .matches = { 593 DMI_MATCH(DMI_BOARD_NAME, "GMxNGxx"), 594 }, 595 }, 596 { 597 .callback = video_detect_force_native, 598 .ident = "TongFang GMxZGxx", 599 .matches = { 600 DMI_MATCH(DMI_BOARD_NAME, "GMxZGxx"), 601 }, 602 }, 603 { 604 .callback = video_detect_force_native, 605 .ident = "TongFang GMxRGxx", 606 .matches = { 607 DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"), 608 }, 609 }, 610 /* 611 * Desktops which falsely report a backlight and which our heuristics 612 * for this do not catch. 613 */ 614 { 615 .callback = video_detect_force_none, 616 .ident = "Dell OptiPlex 9020M", 617 .matches = { 618 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 619 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), 620 }, 621 }, 622 { 623 .callback = video_detect_force_none, 624 .ident = "MSI MS-7721", 625 .matches = { 626 DMI_MATCH(DMI_SYS_VENDOR, "MSI"), 627 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), 628 }, 629 }, 630 { }, 631}; 632 633/* This uses a workqueue to avoid various locking ordering issues */ 634static void acpi_video_backlight_notify_work(struct work_struct *work) 635{ 636 if (acpi_video_get_backlight_type() != acpi_backlight_video) 637 acpi_video_unregister_backlight(); 638} 639 640static int acpi_video_backlight_notify(struct notifier_block *nb, 641 unsigned long val, void *bd) 642{ 643 struct backlight_device *backlight = bd; 644 645 /* A raw bl registering may change video -> native */ 646 if (backlight->props.type == BACKLIGHT_RAW && 647 val == BACKLIGHT_REGISTERED) 648 schedule_work(&backlight_notify_work); 649 650 return NOTIFY_OK; 651} 652 653/* 654 * Determine which type of backlight interface to use on this system, 655 * First check cmdline, then dmi quirks, then do autodetect. 656 * 657 * The autodetect order is: 658 * 1) Is the acpi-video backlight interface supported -> 659 * no, use a vendor interface 660 * 2) Is this a win8 "ready" BIOS and do we have a native interface -> 661 * yes, use a native interface 662 * 3) Else use the acpi-video interface 663 * 664 * Arguably the native on win8 check should be done first, but that would 665 * be a behavior change, which may causes issues. 666 */ 667enum acpi_backlight_type acpi_video_get_backlight_type(void) 668{ 669 static DEFINE_MUTEX(init_mutex); 670 static bool init_done; 671 static long video_caps; 672 673 /* Parse cmdline, dmi and acpi only once */ 674 mutex_lock(&init_mutex); 675 if (!init_done) { 676 acpi_video_parse_cmdline(); 677 dmi_check_system(video_detect_dmi_table); 678 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 679 ACPI_UINT32_MAX, find_video, NULL, 680 &video_caps, NULL); 681 INIT_WORK(&backlight_notify_work, 682 acpi_video_backlight_notify_work); 683 backlight_nb.notifier_call = acpi_video_backlight_notify; 684 backlight_nb.priority = 0; 685 if (backlight_register_notifier(&backlight_nb) == 0) 686 backlight_notifier_registered = true; 687 init_done = true; 688 } 689 mutex_unlock(&init_mutex); 690 691 if (acpi_backlight_cmdline != acpi_backlight_undef) 692 return acpi_backlight_cmdline; 693 694 if (acpi_backlight_dmi != acpi_backlight_undef) 695 return acpi_backlight_dmi; 696 697 if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) 698 return acpi_backlight_vendor; 699 700 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) 701 return acpi_backlight_native; 702 703 return acpi_backlight_video; 704} 705EXPORT_SYMBOL(acpi_video_get_backlight_type); 706 707/* 708 * Set the preferred backlight interface type based on DMI info. 709 * This function allows DMI blacklists to be implemented by external 710 * platform drivers instead of putting a big blacklist in video_detect.c 711 */ 712void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) 713{ 714 acpi_backlight_dmi = type; 715 /* Remove acpi-video backlight interface if it is no longer desired */ 716 if (acpi_video_get_backlight_type() != acpi_backlight_video) 717 acpi_video_unregister_backlight(); 718} 719EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); 720 721void __exit acpi_video_detect_exit(void) 722{ 723 if (backlight_notifier_registered) 724 backlight_unregister_notifier(&backlight_nb); 725} 726