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 = "Sony VPCEH3U1E", 144 .matches = { 145 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 146 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), 147 }, 148 }, 149 150 /* 151 * These models have a working acpi_video backlight control, and using 152 * native backlight causes a regression where backlight does not work 153 * when userspace is not handling brightness key events. Disable 154 * native_backlight on these to fix this: 155 * https://bugzilla.kernel.org/show_bug.cgi?id=81691 156 */ 157 { 158 .callback = video_detect_force_video, 159 .ident = "ThinkPad T420", 160 .matches = { 161 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 162 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), 163 }, 164 }, 165 { 166 .callback = video_detect_force_video, 167 .ident = "ThinkPad T520", 168 .matches = { 169 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 170 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), 171 }, 172 }, 173 { 174 .callback = video_detect_force_video, 175 .ident = "ThinkPad X201s", 176 .matches = { 177 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 178 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), 179 }, 180 }, 181 { 182 .callback = video_detect_force_video, 183 .ident = "ThinkPad X201T", 184 .matches = { 185 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 186 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), 187 }, 188 }, 189 190 /* The native backlight controls do not work on some older machines */ 191 { 192 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ 193 .callback = video_detect_force_video, 194 .ident = "HP ENVY 15 Notebook", 195 .matches = { 196 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 197 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), 198 }, 199 }, 200 { 201 .callback = video_detect_force_video, 202 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E", 203 .matches = { 204 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 205 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), 206 }, 207 }, 208 { 209 .callback = video_detect_force_video, 210 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V", 211 .matches = { 212 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 213 DMI_MATCH(DMI_PRODUCT_NAME, 214 "370R4E/370R4V/370R5E/3570RE/370R5V"), 215 }, 216 }, 217 { 218 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ 219 .callback = video_detect_force_video, 220 .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV", 221 .matches = { 222 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 223 DMI_MATCH(DMI_PRODUCT_NAME, 224 "3570R/370R/470R/450R/510R/4450RV"), 225 }, 226 }, 227 { 228 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ 229 .callback = video_detect_force_video, 230 .ident = "SAMSUNG 670Z5E", 231 .matches = { 232 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 233 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), 234 }, 235 }, 236 { 237 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ 238 .callback = video_detect_force_video, 239 .ident = "SAMSUNG 730U3E/740U3E", 240 .matches = { 241 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 242 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), 243 }, 244 }, 245 { 246 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ 247 .callback = video_detect_force_video, 248 .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D", 249 .matches = { 250 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 251 DMI_MATCH(DMI_PRODUCT_NAME, 252 "900X3C/900X3D/900X3E/900X4C/900X4D"), 253 }, 254 }, 255 { 256 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ 257 .callback = video_detect_force_video, 258 .ident = "Dell XPS14 L421X", 259 .matches = { 260 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 261 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 262 }, 263 }, 264 { 265 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ 266 .callback = video_detect_force_video, 267 .ident = "Dell XPS15 L521X", 268 .matches = { 269 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 270 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), 271 }, 272 }, 273 { 274 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ 275 .callback = video_detect_force_video, 276 .ident = "SAMSUNG 530U4E/540U4E", 277 .matches = { 278 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 279 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), 280 }, 281 }, 282 /* https://bugs.launchpad.net/bugs/1894667 */ 283 { 284 .callback = video_detect_force_video, 285 .ident = "HP 635 Notebook", 286 .matches = { 287 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 288 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), 289 }, 290 }, 291 292 /* Non win8 machines which need native backlight nevertheless */ 293 { 294 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ 295 .callback = video_detect_force_native, 296 .ident = "Lenovo Ideapad S405", 297 .matches = { 298 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 299 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), 300 }, 301 }, 302 { 303 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ 304 .callback = video_detect_force_native, 305 .ident = "Lenovo Ideapad Z570", 306 .matches = { 307 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 308 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), 309 }, 310 }, 311 { 312 .callback = video_detect_force_native, 313 .ident = "Lenovo E41-25", 314 .matches = { 315 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 316 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), 317 }, 318 }, 319 { 320 .callback = video_detect_force_native, 321 .ident = "Lenovo E41-45", 322 .matches = { 323 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 324 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), 325 }, 326 }, 327 { 328 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ 329 .callback = video_detect_force_native, 330 .ident = "Apple MacBook Pro 12,1", 331 .matches = { 332 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 333 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), 334 }, 335 }, 336 { 337 .callback = video_detect_force_native, 338 .ident = "Dell Vostro V131", 339 .matches = { 340 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 341 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 342 }, 343 }, 344 { 345 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ 346 .callback = video_detect_force_native, 347 .ident = "Dell XPS 17 L702X", 348 .matches = { 349 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 350 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), 351 }, 352 }, 353 { 354 .callback = video_detect_force_native, 355 .ident = "Dell Precision 7510", 356 .matches = { 357 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 358 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 359 }, 360 }, 361 { 362 .callback = video_detect_force_native, 363 .ident = "Acer Aspire 5738z", 364 .matches = { 365 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 366 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), 367 DMI_MATCH(DMI_BOARD_NAME, "JV50"), 368 }, 369 }, 370 { 371 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ 372 .callback = video_detect_force_native, 373 .ident = "Acer TravelMate 5735Z", 374 .matches = { 375 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 376 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), 377 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), 378 }, 379 }, 380 381 /* 382 * Desktops which falsely report a backlight and which our heuristics 383 * for this do not catch. 384 */ 385 { 386 .callback = video_detect_force_none, 387 .ident = "Dell OptiPlex 9020M", 388 .matches = { 389 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 390 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), 391 }, 392 }, 393 { 394 .callback = video_detect_force_none, 395 .ident = "MSI MS-7721", 396 .matches = { 397 DMI_MATCH(DMI_SYS_VENDOR, "MSI"), 398 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), 399 }, 400 }, 401 { }, 402 }; 403 404 /* This uses a workqueue to avoid various locking ordering issues */ 405 static void acpi_video_backlight_notify_work(struct work_struct *work) 406 { 407 if (acpi_video_get_backlight_type() != acpi_backlight_video) 408 acpi_video_unregister_backlight(); 409 } 410 411 static int acpi_video_backlight_notify(struct notifier_block *nb, 412 unsigned long val, void *bd) 413 { 414 struct backlight_device *backlight = bd; 415 416 /* A raw bl registering may change video -> native */ 417 if (backlight->props.type == BACKLIGHT_RAW && 418 val == BACKLIGHT_REGISTERED) 419 schedule_work(&backlight_notify_work); 420 421 return NOTIFY_OK; 422 } 423 424 /* 425 * Determine which type of backlight interface to use on this system, 426 * First check cmdline, then dmi quirks, then do autodetect. 427 * 428 * The autodetect order is: 429 * 1) Is the acpi-video backlight interface supported -> 430 * no, use a vendor interface 431 * 2) Is this a win8 "ready" BIOS and do we have a native interface -> 432 * yes, use a native interface 433 * 3) Else use the acpi-video interface 434 * 435 * Arguably the native on win8 check should be done first, but that would 436 * be a behavior change, which may causes issues. 437 */ 438 enum acpi_backlight_type acpi_video_get_backlight_type(void) 439 { 440 static DEFINE_MUTEX(init_mutex); 441 static bool init_done; 442 static long video_caps; 443 444 /* Parse cmdline, dmi and acpi only once */ 445 mutex_lock(&init_mutex); 446 if (!init_done) { 447 acpi_video_parse_cmdline(); 448 dmi_check_system(video_detect_dmi_table); 449 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 450 ACPI_UINT32_MAX, find_video, NULL, 451 &video_caps, NULL); 452 INIT_WORK(&backlight_notify_work, 453 acpi_video_backlight_notify_work); 454 backlight_nb.notifier_call = acpi_video_backlight_notify; 455 backlight_nb.priority = 0; 456 if (backlight_register_notifier(&backlight_nb) == 0) 457 backlight_notifier_registered = true; 458 init_done = true; 459 } 460 mutex_unlock(&init_mutex); 461 462 if (acpi_backlight_cmdline != acpi_backlight_undef) 463 return acpi_backlight_cmdline; 464 465 if (acpi_backlight_dmi != acpi_backlight_undef) 466 return acpi_backlight_dmi; 467 468 if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) 469 return acpi_backlight_vendor; 470 471 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) 472 return acpi_backlight_native; 473 474 return acpi_backlight_video; 475 } 476 EXPORT_SYMBOL(acpi_video_get_backlight_type); 477 478 /* 479 * Set the preferred backlight interface type based on DMI info. 480 * This function allows DMI blacklists to be implemented by external 481 * platform drivers instead of putting a big blacklist in video_detect.c 482 */ 483 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) 484 { 485 acpi_backlight_dmi = type; 486 /* Remove acpi-video backlight interface if it is no longer desired */ 487 if (acpi_video_get_backlight_type() != acpi_backlight_video) 488 acpi_video_unregister_backlight(); 489 } 490 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); 491 492 void __exit acpi_video_detect_exit(void) 493 { 494 if (backlight_notifier_registered) 495 backlight_unregister_notifier(&backlight_nb); 496 } 497