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 .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.redhat.com/show_bug.cgi?id=1187004 */ 312 .callback = video_detect_force_native, 313 .ident = "Lenovo Ideapad Z570", 314 .matches = { 315 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 316 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), 317 }, 318 }, 319 { 320 .callback = video_detect_force_native, 321 .ident = "Lenovo E41-25", 322 .matches = { 323 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 324 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), 325 }, 326 }, 327 { 328 .callback = video_detect_force_native, 329 .ident = "Lenovo E41-45", 330 .matches = { 331 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 332 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), 333 }, 334 }, 335 { 336 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ 337 .callback = video_detect_force_native, 338 .ident = "Apple MacBook Pro 12,1", 339 .matches = { 340 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 341 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), 342 }, 343 }, 344 { 345 .callback = video_detect_force_native, 346 .ident = "Dell Vostro V131", 347 .matches = { 348 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 349 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 350 }, 351 }, 352 { 353 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ 354 .callback = video_detect_force_native, 355 .ident = "Dell XPS 17 L702X", 356 .matches = { 357 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 358 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), 359 }, 360 }, 361 { 362 .callback = video_detect_force_native, 363 .ident = "Dell Precision 7510", 364 .matches = { 365 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 366 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 367 }, 368 }, 369 { 370 .callback = video_detect_force_native, 371 .ident = "Acer Aspire 5738z", 372 .matches = { 373 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 374 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), 375 DMI_MATCH(DMI_BOARD_NAME, "JV50"), 376 }, 377 }, 378 { 379 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ 380 .callback = video_detect_force_native, 381 .ident = "Acer TravelMate 5735Z", 382 .matches = { 383 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 384 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), 385 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), 386 }, 387 }, 388 { 389 .callback = video_detect_force_native, 390 .ident = "ASUSTeK COMPUTER INC. GA401", 391 .matches = { 392 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 393 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"), 394 }, 395 }, 396 { 397 .callback = video_detect_force_native, 398 .ident = "ASUSTeK COMPUTER INC. GA502", 399 .matches = { 400 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 401 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"), 402 }, 403 }, 404 { 405 .callback = video_detect_force_native, 406 .ident = "ASUSTeK COMPUTER INC. GA503", 407 .matches = { 408 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 409 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"), 410 }, 411 }, 412 413 /* 414 * Desktops which falsely report a backlight and which our heuristics 415 * for this do not catch. 416 */ 417 { 418 .callback = video_detect_force_none, 419 .ident = "Dell OptiPlex 9020M", 420 .matches = { 421 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 422 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), 423 }, 424 }, 425 { 426 .callback = video_detect_force_none, 427 .ident = "MSI MS-7721", 428 .matches = { 429 DMI_MATCH(DMI_SYS_VENDOR, "MSI"), 430 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), 431 }, 432 }, 433 { }, 434 }; 435 436 /* This uses a workqueue to avoid various locking ordering issues */ 437 static void acpi_video_backlight_notify_work(struct work_struct *work) 438 { 439 if (acpi_video_get_backlight_type() != acpi_backlight_video) 440 acpi_video_unregister_backlight(); 441 } 442 443 static int acpi_video_backlight_notify(struct notifier_block *nb, 444 unsigned long val, void *bd) 445 { 446 struct backlight_device *backlight = bd; 447 448 /* A raw bl registering may change video -> native */ 449 if (backlight->props.type == BACKLIGHT_RAW && 450 val == BACKLIGHT_REGISTERED) 451 schedule_work(&backlight_notify_work); 452 453 return NOTIFY_OK; 454 } 455 456 /* 457 * Determine which type of backlight interface to use on this system, 458 * First check cmdline, then dmi quirks, then do autodetect. 459 * 460 * The autodetect order is: 461 * 1) Is the acpi-video backlight interface supported -> 462 * no, use a vendor interface 463 * 2) Is this a win8 "ready" BIOS and do we have a native interface -> 464 * yes, use a native interface 465 * 3) Else use the acpi-video interface 466 * 467 * Arguably the native on win8 check should be done first, but that would 468 * be a behavior change, which may causes issues. 469 */ 470 enum acpi_backlight_type acpi_video_get_backlight_type(void) 471 { 472 static DEFINE_MUTEX(init_mutex); 473 static bool init_done; 474 static long video_caps; 475 476 /* Parse cmdline, dmi and acpi only once */ 477 mutex_lock(&init_mutex); 478 if (!init_done) { 479 acpi_video_parse_cmdline(); 480 dmi_check_system(video_detect_dmi_table); 481 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 482 ACPI_UINT32_MAX, find_video, NULL, 483 &video_caps, NULL); 484 INIT_WORK(&backlight_notify_work, 485 acpi_video_backlight_notify_work); 486 backlight_nb.notifier_call = acpi_video_backlight_notify; 487 backlight_nb.priority = 0; 488 if (backlight_register_notifier(&backlight_nb) == 0) 489 backlight_notifier_registered = true; 490 init_done = true; 491 } 492 mutex_unlock(&init_mutex); 493 494 if (acpi_backlight_cmdline != acpi_backlight_undef) 495 return acpi_backlight_cmdline; 496 497 if (acpi_backlight_dmi != acpi_backlight_undef) 498 return acpi_backlight_dmi; 499 500 if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) 501 return acpi_backlight_vendor; 502 503 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) 504 return acpi_backlight_native; 505 506 return acpi_backlight_video; 507 } 508 EXPORT_SYMBOL(acpi_video_get_backlight_type); 509 510 /* 511 * Set the preferred backlight interface type based on DMI info. 512 * This function allows DMI blacklists to be implemented by external 513 * platform drivers instead of putting a big blacklist in video_detect.c 514 */ 515 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) 516 { 517 acpi_backlight_dmi = type; 518 /* Remove acpi-video backlight interface if it is no longer desired */ 519 if (acpi_video_get_backlight_type() != acpi_backlight_video) 520 acpi_video_unregister_backlight(); 521 } 522 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); 523 524 void __exit acpi_video_detect_exit(void) 525 { 526 if (backlight_notifier_registered) 527 backlight_unregister_notifier(&backlight_nb); 528 } 529