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 38 void acpi_video_unregister_backlight(void); 39 40 static bool backlight_notifier_registered; 41 static struct notifier_block backlight_nb; 42 static struct work_struct backlight_notify_work; 43 44 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; 45 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; 46 47 static 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 59 static acpi_status 60 find_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 */ 85 static int video_detect_force_vendor(const struct dmi_system_id *d) 86 { 87 acpi_backlight_dmi = acpi_backlight_vendor; 88 return 0; 89 } 90 91 static int video_detect_force_video(const struct dmi_system_id *d) 92 { 93 acpi_backlight_dmi = acpi_backlight_video; 94 return 0; 95 } 96 97 static int video_detect_force_native(const struct dmi_system_id *d) 98 { 99 acpi_backlight_dmi = acpi_backlight_native; 100 return 0; 101 } 102 103 static int video_detect_force_none(const struct dmi_system_id *d) 104 { 105 acpi_backlight_dmi = acpi_backlight_none; 106 return 0; 107 } 108 109 static 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 /* 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 /* 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 /* 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 /* 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 /* Sony VPCEH3U1E */ 152 .matches = { 153 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 154 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), 155 }, 156 }, 157 { 158 .callback = video_detect_force_vendor, 159 /* Xiaomi Mi Pad 2 */ 160 .matches = { 161 DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"), 162 DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"), 163 }, 164 }, 165 166 /* 167 * These models have a working acpi_video backlight control, and using 168 * native backlight causes a regression where backlight does not work 169 * when userspace is not handling brightness key events. Disable 170 * native_backlight on these to fix this: 171 * https://bugzilla.kernel.org/show_bug.cgi?id=81691 172 */ 173 { 174 .callback = video_detect_force_video, 175 /* ThinkPad T420 */ 176 .matches = { 177 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 178 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), 179 }, 180 }, 181 { 182 .callback = video_detect_force_video, 183 /* ThinkPad T520 */ 184 .matches = { 185 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 186 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), 187 }, 188 }, 189 { 190 .callback = video_detect_force_video, 191 /* ThinkPad X201s */ 192 .matches = { 193 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 194 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), 195 }, 196 }, 197 { 198 .callback = video_detect_force_video, 199 /* ThinkPad X201T */ 200 .matches = { 201 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 202 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), 203 }, 204 }, 205 206 /* The native backlight controls do not work on some older machines */ 207 { 208 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ 209 .callback = video_detect_force_video, 210 /* HP ENVY 15 Notebook */ 211 .matches = { 212 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 213 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), 214 }, 215 }, 216 { 217 .callback = video_detect_force_video, 218 /* SAMSUNG 870Z5E/880Z5E/680Z5E */ 219 .matches = { 220 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 221 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), 222 }, 223 }, 224 { 225 .callback = video_detect_force_video, 226 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */ 227 .matches = { 228 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 229 DMI_MATCH(DMI_PRODUCT_NAME, 230 "370R4E/370R4V/370R5E/3570RE/370R5V"), 231 }, 232 }, 233 { 234 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ 235 .callback = video_detect_force_video, 236 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */ 237 .matches = { 238 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 239 DMI_MATCH(DMI_PRODUCT_NAME, 240 "3570R/370R/470R/450R/510R/4450RV"), 241 }, 242 }, 243 { 244 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ 245 .callback = video_detect_force_video, 246 /* SAMSUNG 670Z5E */ 247 .matches = { 248 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 249 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), 250 }, 251 }, 252 { 253 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ 254 .callback = video_detect_force_video, 255 /* SAMSUNG 730U3E/740U3E */ 256 .matches = { 257 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 258 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), 259 }, 260 }, 261 { 262 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ 263 .callback = video_detect_force_video, 264 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */ 265 .matches = { 266 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 267 DMI_MATCH(DMI_PRODUCT_NAME, 268 "900X3C/900X3D/900X3E/900X4C/900X4D"), 269 }, 270 }, 271 { 272 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ 273 .callback = video_detect_force_video, 274 /* Dell XPS14 L421X */ 275 .matches = { 276 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 277 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 278 }, 279 }, 280 { 281 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ 282 .callback = video_detect_force_video, 283 /* Dell XPS15 L521X */ 284 .matches = { 285 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 286 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), 287 }, 288 }, 289 { 290 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ 291 .callback = video_detect_force_video, 292 /* SAMSUNG 530U4E/540U4E */ 293 .matches = { 294 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 295 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), 296 }, 297 }, 298 /* https://bugs.launchpad.net/bugs/1894667 */ 299 { 300 .callback = video_detect_force_video, 301 /* HP 635 Notebook */ 302 .matches = { 303 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 304 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), 305 }, 306 }, 307 308 /* Non win8 machines which need native backlight nevertheless */ 309 { 310 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ 311 .callback = video_detect_force_native, 312 /* Lenovo Ideapad S405 */ 313 .matches = { 314 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 315 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), 316 }, 317 }, 318 { 319 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ 320 .callback = video_detect_force_native, 321 /* Lenovo Ideapad Z570 */ 322 .matches = { 323 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 324 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), 325 }, 326 }, 327 { 328 .callback = video_detect_force_native, 329 /* Lenovo E41-25 */ 330 .matches = { 331 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 332 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), 333 }, 334 }, 335 { 336 .callback = video_detect_force_native, 337 /* Lenovo E41-45 */ 338 .matches = { 339 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 340 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), 341 }, 342 }, 343 { 344 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ 345 .callback = video_detect_force_native, 346 /* Apple MacBook Pro 12,1 */ 347 .matches = { 348 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 349 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), 350 }, 351 }, 352 { 353 .callback = video_detect_force_native, 354 /* Dell Vostro V131 */ 355 .matches = { 356 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 357 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 358 }, 359 }, 360 { 361 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ 362 .callback = video_detect_force_native, 363 /* Dell XPS 17 L702X */ 364 .matches = { 365 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 366 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), 367 }, 368 }, 369 { 370 .callback = video_detect_force_native, 371 /* Dell Precision 7510 */ 372 .matches = { 373 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 374 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 375 }, 376 }, 377 { 378 .callback = video_detect_force_native, 379 /* Acer Aspire 5738z */ 380 .matches = { 381 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 382 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), 383 DMI_MATCH(DMI_BOARD_NAME, "JV50"), 384 }, 385 }, 386 { 387 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ 388 .callback = video_detect_force_native, 389 /* Acer TravelMate 5735Z */ 390 .matches = { 391 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 392 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), 393 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), 394 }, 395 }, 396 { 397 .callback = video_detect_force_native, 398 /* ASUSTeK COMPUTER INC. GA401 */ 399 .matches = { 400 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 401 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"), 402 }, 403 }, 404 { 405 .callback = video_detect_force_native, 406 /* ASUSTeK COMPUTER INC. GA502 */ 407 .matches = { 408 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 409 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"), 410 }, 411 }, 412 { 413 .callback = video_detect_force_native, 414 /* ASUSTeK COMPUTER INC. GA503 */ 415 .matches = { 416 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 417 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"), 418 }, 419 }, 420 421 /* 422 * Desktops which falsely report a backlight and which our heuristics 423 * for this do not catch. 424 */ 425 { 426 .callback = video_detect_force_none, 427 /* Dell OptiPlex 9020M */ 428 .matches = { 429 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 430 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), 431 }, 432 }, 433 { 434 .callback = video_detect_force_none, 435 /* MSI MS-7721 */ 436 .matches = { 437 DMI_MATCH(DMI_SYS_VENDOR, "MSI"), 438 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), 439 }, 440 }, 441 { }, 442 }; 443 444 /* This uses a workqueue to avoid various locking ordering issues */ 445 static void acpi_video_backlight_notify_work(struct work_struct *work) 446 { 447 if (acpi_video_get_backlight_type() != acpi_backlight_video) 448 acpi_video_unregister_backlight(); 449 } 450 451 static int acpi_video_backlight_notify(struct notifier_block *nb, 452 unsigned long val, void *bd) 453 { 454 struct backlight_device *backlight = bd; 455 456 /* A raw bl registering may change video -> native */ 457 if (backlight->props.type == BACKLIGHT_RAW && 458 val == BACKLIGHT_REGISTERED) 459 schedule_work(&backlight_notify_work); 460 461 return NOTIFY_OK; 462 } 463 464 /* 465 * Determine which type of backlight interface to use on this system, 466 * First check cmdline, then dmi quirks, then do autodetect. 467 * 468 * The autodetect order is: 469 * 1) Is the acpi-video backlight interface supported -> 470 * no, use a vendor interface 471 * 2) Is this a win8 "ready" BIOS and do we have a native interface -> 472 * yes, use a native interface 473 * 3) Else use the acpi-video interface 474 * 475 * Arguably the native on win8 check should be done first, but that would 476 * be a behavior change, which may causes issues. 477 */ 478 enum acpi_backlight_type acpi_video_get_backlight_type(void) 479 { 480 static DEFINE_MUTEX(init_mutex); 481 static bool init_done; 482 static long video_caps; 483 484 /* Parse cmdline, dmi and acpi only once */ 485 mutex_lock(&init_mutex); 486 if (!init_done) { 487 acpi_video_parse_cmdline(); 488 dmi_check_system(video_detect_dmi_table); 489 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 490 ACPI_UINT32_MAX, find_video, NULL, 491 &video_caps, NULL); 492 INIT_WORK(&backlight_notify_work, 493 acpi_video_backlight_notify_work); 494 backlight_nb.notifier_call = acpi_video_backlight_notify; 495 backlight_nb.priority = 0; 496 if (backlight_register_notifier(&backlight_nb) == 0) 497 backlight_notifier_registered = true; 498 init_done = true; 499 } 500 mutex_unlock(&init_mutex); 501 502 if (acpi_backlight_cmdline != acpi_backlight_undef) 503 return acpi_backlight_cmdline; 504 505 if (acpi_backlight_dmi != acpi_backlight_undef) 506 return acpi_backlight_dmi; 507 508 if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) 509 return acpi_backlight_vendor; 510 511 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) 512 return acpi_backlight_native; 513 514 return acpi_backlight_video; 515 } 516 EXPORT_SYMBOL(acpi_video_get_backlight_type); 517 518 /* 519 * Set the preferred backlight interface type based on DMI info. 520 * This function allows DMI blacklists to be implemented by external 521 * platform drivers instead of putting a big blacklist in video_detect.c 522 */ 523 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) 524 { 525 acpi_backlight_dmi = type; 526 /* Remove acpi-video backlight interface if it is no longer desired */ 527 if (acpi_video_get_backlight_type() != acpi_backlight_video) 528 acpi_video_unregister_backlight(); 529 } 530 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); 531 532 void __exit acpi_video_detect_exit(void) 533 { 534 if (backlight_notifier_registered) 535 backlight_unregister_notifier(&backlight_nb); 536 } 537