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 .ident = "Sony VPCEH3U1E", 151 .matches = { 152 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 153 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), 154 }, 155 }, 156 157 /* 158 * These models have a working acpi_video backlight control, and using 159 * native backlight causes a regression where backlight does not work 160 * when userspace is not handling brightness key events. Disable 161 * native_backlight on these to fix this: 162 * https://bugzilla.kernel.org/show_bug.cgi?id=81691 163 */ 164 { 165 .callback = video_detect_force_video, 166 .ident = "ThinkPad T420", 167 .matches = { 168 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 169 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), 170 }, 171 }, 172 { 173 .callback = video_detect_force_video, 174 .ident = "ThinkPad T520", 175 .matches = { 176 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 177 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), 178 }, 179 }, 180 { 181 .callback = video_detect_force_video, 182 .ident = "ThinkPad X201s", 183 .matches = { 184 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 185 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), 186 }, 187 }, 188 { 189 .callback = video_detect_force_video, 190 .ident = "ThinkPad X201T", 191 .matches = { 192 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 193 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), 194 }, 195 }, 196 197 /* The native backlight controls do not work on some older machines */ 198 { 199 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ 200 .callback = video_detect_force_video, 201 .ident = "HP ENVY 15 Notebook", 202 .matches = { 203 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 204 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), 205 }, 206 }, 207 { 208 .callback = video_detect_force_video, 209 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E", 210 .matches = { 211 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 212 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), 213 }, 214 }, 215 { 216 .callback = video_detect_force_video, 217 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V", 218 .matches = { 219 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 220 DMI_MATCH(DMI_PRODUCT_NAME, 221 "370R4E/370R4V/370R5E/3570RE/370R5V"), 222 }, 223 }, 224 { 225 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ 226 .callback = video_detect_force_video, 227 .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV", 228 .matches = { 229 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 230 DMI_MATCH(DMI_PRODUCT_NAME, 231 "3570R/370R/470R/450R/510R/4450RV"), 232 }, 233 }, 234 { 235 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ 236 .callback = video_detect_force_video, 237 .ident = "SAMSUNG 670Z5E", 238 .matches = { 239 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 240 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), 241 }, 242 }, 243 { 244 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ 245 .callback = video_detect_force_video, 246 .ident = "SAMSUNG 730U3E/740U3E", 247 .matches = { 248 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 249 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), 250 }, 251 }, 252 { 253 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ 254 .callback = video_detect_force_video, 255 .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D", 256 .matches = { 257 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 258 DMI_MATCH(DMI_PRODUCT_NAME, 259 "900X3C/900X3D/900X3E/900X4C/900X4D"), 260 }, 261 }, 262 { 263 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ 264 .callback = video_detect_force_video, 265 .ident = "Dell XPS14 L421X", 266 .matches = { 267 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 268 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 269 }, 270 }, 271 { 272 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ 273 .callback = video_detect_force_video, 274 .ident = "Dell XPS15 L521X", 275 .matches = { 276 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 277 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), 278 }, 279 }, 280 { 281 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ 282 .callback = video_detect_force_video, 283 .ident = "SAMSUNG 530U4E/540U4E", 284 .matches = { 285 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 286 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), 287 }, 288 }, 289 /* https://bugs.launchpad.net/bugs/1894667 */ 290 { 291 .callback = video_detect_force_video, 292 .ident = "HP 635 Notebook", 293 .matches = { 294 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 295 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), 296 }, 297 }, 298 299 /* Non win8 machines which need native backlight nevertheless */ 300 { 301 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ 302 .callback = video_detect_force_native, 303 .ident = "Lenovo Ideapad S405", 304 .matches = { 305 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 306 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), 307 }, 308 }, 309 { 310 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ 311 .callback = video_detect_force_native, 312 .ident = "Lenovo Ideapad Z570", 313 .matches = { 314 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 315 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), 316 }, 317 }, 318 { 319 .callback = video_detect_force_native, 320 .ident = "Lenovo E41-25", 321 .matches = { 322 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 323 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), 324 }, 325 }, 326 { 327 .callback = video_detect_force_native, 328 .ident = "Lenovo E41-45", 329 .matches = { 330 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 331 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), 332 }, 333 }, 334 { 335 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ 336 .callback = video_detect_force_native, 337 .ident = "Apple MacBook Pro 12,1", 338 .matches = { 339 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 340 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), 341 }, 342 }, 343 { 344 .callback = video_detect_force_native, 345 .ident = "Dell Vostro V131", 346 .matches = { 347 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 348 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 349 }, 350 }, 351 { 352 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ 353 .callback = video_detect_force_native, 354 .ident = "Dell XPS 17 L702X", 355 .matches = { 356 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 357 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), 358 }, 359 }, 360 { 361 .callback = video_detect_force_native, 362 .ident = "Dell Precision 7510", 363 .matches = { 364 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 365 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 366 }, 367 }, 368 { 369 .callback = video_detect_force_native, 370 .ident = "Acer Aspire 5738z", 371 .matches = { 372 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 373 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), 374 DMI_MATCH(DMI_BOARD_NAME, "JV50"), 375 }, 376 }, 377 { 378 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ 379 .callback = video_detect_force_native, 380 .ident = "Acer TravelMate 5735Z", 381 .matches = { 382 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 383 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), 384 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), 385 }, 386 }, 387 388 /* 389 * Desktops which falsely report a backlight and which our heuristics 390 * for this do not catch. 391 */ 392 { 393 .callback = video_detect_force_none, 394 .ident = "Dell OptiPlex 9020M", 395 .matches = { 396 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 397 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), 398 }, 399 }, 400 { 401 .callback = video_detect_force_none, 402 .ident = "MSI MS-7721", 403 .matches = { 404 DMI_MATCH(DMI_SYS_VENDOR, "MSI"), 405 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), 406 }, 407 }, 408 { }, 409 }; 410 411 /* This uses a workqueue to avoid various locking ordering issues */ 412 static void acpi_video_backlight_notify_work(struct work_struct *work) 413 { 414 if (acpi_video_get_backlight_type() != acpi_backlight_video) 415 acpi_video_unregister_backlight(); 416 } 417 418 static int acpi_video_backlight_notify(struct notifier_block *nb, 419 unsigned long val, void *bd) 420 { 421 struct backlight_device *backlight = bd; 422 423 /* A raw bl registering may change video -> native */ 424 if (backlight->props.type == BACKLIGHT_RAW && 425 val == BACKLIGHT_REGISTERED) 426 schedule_work(&backlight_notify_work); 427 428 return NOTIFY_OK; 429 } 430 431 /* 432 * Determine which type of backlight interface to use on this system, 433 * First check cmdline, then dmi quirks, then do autodetect. 434 * 435 * The autodetect order is: 436 * 1) Is the acpi-video backlight interface supported -> 437 * no, use a vendor interface 438 * 2) Is this a win8 "ready" BIOS and do we have a native interface -> 439 * yes, use a native interface 440 * 3) Else use the acpi-video interface 441 * 442 * Arguably the native on win8 check should be done first, but that would 443 * be a behavior change, which may causes issues. 444 */ 445 enum acpi_backlight_type acpi_video_get_backlight_type(void) 446 { 447 static DEFINE_MUTEX(init_mutex); 448 static bool init_done; 449 static long video_caps; 450 451 /* Parse cmdline, dmi and acpi only once */ 452 mutex_lock(&init_mutex); 453 if (!init_done) { 454 acpi_video_parse_cmdline(); 455 dmi_check_system(video_detect_dmi_table); 456 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 457 ACPI_UINT32_MAX, find_video, NULL, 458 &video_caps, NULL); 459 INIT_WORK(&backlight_notify_work, 460 acpi_video_backlight_notify_work); 461 backlight_nb.notifier_call = acpi_video_backlight_notify; 462 backlight_nb.priority = 0; 463 if (backlight_register_notifier(&backlight_nb) == 0) 464 backlight_notifier_registered = true; 465 init_done = true; 466 } 467 mutex_unlock(&init_mutex); 468 469 if (acpi_backlight_cmdline != acpi_backlight_undef) 470 return acpi_backlight_cmdline; 471 472 if (acpi_backlight_dmi != acpi_backlight_undef) 473 return acpi_backlight_dmi; 474 475 if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) 476 return acpi_backlight_vendor; 477 478 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) 479 return acpi_backlight_native; 480 481 return acpi_backlight_video; 482 } 483 EXPORT_SYMBOL(acpi_video_get_backlight_type); 484 485 /* 486 * Set the preferred backlight interface type based on DMI info. 487 * This function allows DMI blacklists to be implemented by external 488 * platform drivers instead of putting a big blacklist in video_detect.c 489 */ 490 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) 491 { 492 acpi_backlight_dmi = type; 493 /* Remove acpi-video backlight interface if it is no longer desired */ 494 if (acpi_video_get_backlight_type() != acpi_backlight_video) 495 acpi_video_unregister_backlight(); 496 } 497 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); 498 499 void __exit acpi_video_detect_exit(void) 500 { 501 if (backlight_notifier_registered) 502 backlight_unregister_notifier(&backlight_nb); 503 } 504