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 ACPI_MODULE_NAME("video"); 39 #define _COMPONENT ACPI_VIDEO_COMPONENT 40 41 void acpi_video_unregister_backlight(void); 42 43 static bool backlight_notifier_registered; 44 static struct notifier_block backlight_nb; 45 static struct work_struct backlight_notify_work; 46 47 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; 48 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; 49 50 static void acpi_video_parse_cmdline(void) 51 { 52 if (!strcmp("vendor", acpi_video_backlight_string)) 53 acpi_backlight_cmdline = acpi_backlight_vendor; 54 if (!strcmp("video", acpi_video_backlight_string)) 55 acpi_backlight_cmdline = acpi_backlight_video; 56 if (!strcmp("native", acpi_video_backlight_string)) 57 acpi_backlight_cmdline = acpi_backlight_native; 58 if (!strcmp("none", acpi_video_backlight_string)) 59 acpi_backlight_cmdline = acpi_backlight_none; 60 } 61 62 static acpi_status 63 find_video(acpi_handle handle, u32 lvl, void *context, void **rv) 64 { 65 long *cap = context; 66 struct pci_dev *dev; 67 struct acpi_device *acpi_dev; 68 69 static const struct acpi_device_id video_ids[] = { 70 {ACPI_VIDEO_HID, 0}, 71 {"", 0}, 72 }; 73 if (acpi_bus_get_device(handle, &acpi_dev)) 74 return AE_OK; 75 76 if (!acpi_match_device_ids(acpi_dev, video_ids)) { 77 dev = acpi_get_pci_dev(handle); 78 if (!dev) 79 return AE_OK; 80 pci_dev_put(dev); 81 *cap |= acpi_is_video_device(handle); 82 } 83 return AE_OK; 84 } 85 86 /* Force to use vendor driver when the ACPI device is known to be 87 * buggy */ 88 static int video_detect_force_vendor(const struct dmi_system_id *d) 89 { 90 acpi_backlight_dmi = acpi_backlight_vendor; 91 return 0; 92 } 93 94 static int video_detect_force_video(const struct dmi_system_id *d) 95 { 96 acpi_backlight_dmi = acpi_backlight_video; 97 return 0; 98 } 99 100 static int video_detect_force_native(const struct dmi_system_id *d) 101 { 102 acpi_backlight_dmi = acpi_backlight_native; 103 return 0; 104 } 105 106 static int video_detect_force_none(const struct dmi_system_id *d) 107 { 108 acpi_backlight_dmi = acpi_backlight_none; 109 return 0; 110 } 111 112 static const struct dmi_system_id video_detect_dmi_table[] = { 113 /* On Samsung X360, the BIOS will set a flag (VDRV) if generic 114 * ACPI backlight device is used. This flag will definitively break 115 * the backlight interface (even the vendor interface) untill next 116 * reboot. It's why we should prevent video.ko from being used here 117 * and we can't rely on a later call to acpi_video_unregister(). 118 */ 119 { 120 .callback = video_detect_force_vendor, 121 .ident = "X360", 122 .matches = { 123 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 124 DMI_MATCH(DMI_PRODUCT_NAME, "X360"), 125 DMI_MATCH(DMI_BOARD_NAME, "X360"), 126 }, 127 }, 128 { 129 .callback = video_detect_force_vendor, 130 .ident = "Asus UL30VT", 131 .matches = { 132 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 133 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), 134 }, 135 }, 136 { 137 .callback = video_detect_force_vendor, 138 .ident = "Asus UL30A", 139 .matches = { 140 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 141 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), 142 }, 143 }, 144 145 /* 146 * These models have a working acpi_video backlight control, and using 147 * native backlight causes a regression where backlight does not work 148 * when userspace is not handling brightness key events. Disable 149 * native_backlight on these to fix this: 150 * https://bugzilla.kernel.org/show_bug.cgi?id=81691 151 */ 152 { 153 .callback = video_detect_force_video, 154 .ident = "ThinkPad T420", 155 .matches = { 156 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 157 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), 158 }, 159 }, 160 { 161 .callback = video_detect_force_video, 162 .ident = "ThinkPad T520", 163 .matches = { 164 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 165 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), 166 }, 167 }, 168 { 169 .callback = video_detect_force_video, 170 .ident = "ThinkPad X201s", 171 .matches = { 172 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 173 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), 174 }, 175 }, 176 { 177 .callback = video_detect_force_video, 178 .ident = "ThinkPad X201T", 179 .matches = { 180 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 181 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), 182 }, 183 }, 184 185 /* The native backlight controls do not work on some older machines */ 186 { 187 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ 188 .callback = video_detect_force_video, 189 .ident = "HP ENVY 15 Notebook", 190 .matches = { 191 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 192 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), 193 }, 194 }, 195 { 196 .callback = video_detect_force_video, 197 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E", 198 .matches = { 199 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 200 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), 201 }, 202 }, 203 { 204 .callback = video_detect_force_video, 205 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V", 206 .matches = { 207 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 208 DMI_MATCH(DMI_PRODUCT_NAME, 209 "370R4E/370R4V/370R5E/3570RE/370R5V"), 210 }, 211 }, 212 { 213 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ 214 .callback = video_detect_force_video, 215 .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV", 216 .matches = { 217 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 218 DMI_MATCH(DMI_PRODUCT_NAME, 219 "3570R/370R/470R/450R/510R/4450RV"), 220 }, 221 }, 222 { 223 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ 224 .callback = video_detect_force_video, 225 .ident = "SAMSUNG 730U3E/740U3E", 226 .matches = { 227 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 228 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), 229 }, 230 }, 231 { 232 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ 233 .callback = video_detect_force_video, 234 .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D", 235 .matches = { 236 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 237 DMI_MATCH(DMI_PRODUCT_NAME, 238 "900X3C/900X3D/900X3E/900X4C/900X4D"), 239 }, 240 }, 241 { 242 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ 243 .callback = video_detect_force_video, 244 .ident = "Dell XPS14 L421X", 245 .matches = { 246 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 247 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), 248 }, 249 }, 250 { 251 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ 252 .callback = video_detect_force_video, 253 .ident = "Dell XPS15 L521X", 254 .matches = { 255 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 256 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), 257 }, 258 }, 259 { 260 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ 261 .callback = video_detect_force_video, 262 .ident = "SAMSUNG 530U4E/540U4E", 263 .matches = { 264 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), 265 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), 266 }, 267 }, 268 269 /* Non win8 machines which need native backlight nevertheless */ 270 { 271 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ 272 .callback = video_detect_force_native, 273 .ident = "Lenovo Ideapad S405", 274 .matches = { 275 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 276 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), 277 }, 278 }, 279 { 280 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ 281 .callback = video_detect_force_native, 282 .ident = "Lenovo Ideapad Z570", 283 .matches = { 284 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 285 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), 286 }, 287 }, 288 { 289 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ 290 .callback = video_detect_force_native, 291 .ident = "Apple MacBook Pro 12,1", 292 .matches = { 293 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), 294 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), 295 }, 296 }, 297 { 298 .callback = video_detect_force_native, 299 .ident = "Dell Vostro V131", 300 .matches = { 301 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 302 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), 303 }, 304 }, 305 { 306 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ 307 .callback = video_detect_force_native, 308 .ident = "Dell XPS 17 L702X", 309 .matches = { 310 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 311 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), 312 }, 313 }, 314 { 315 .callback = video_detect_force_native, 316 .ident = "Dell Precision 7510", 317 .matches = { 318 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 319 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), 320 }, 321 }, 322 { 323 .callback = video_detect_force_none, 324 .ident = "Dell OptiPlex 9020M", 325 .matches = { 326 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), 327 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), 328 }, 329 }, 330 { }, 331 }; 332 333 /* This uses a workqueue to avoid various locking ordering issues */ 334 static void acpi_video_backlight_notify_work(struct work_struct *work) 335 { 336 if (acpi_video_get_backlight_type() != acpi_backlight_video) 337 acpi_video_unregister_backlight(); 338 } 339 340 static int acpi_video_backlight_notify(struct notifier_block *nb, 341 unsigned long val, void *bd) 342 { 343 struct backlight_device *backlight = bd; 344 345 /* A raw bl registering may change video -> native */ 346 if (backlight->props.type == BACKLIGHT_RAW && 347 val == BACKLIGHT_REGISTERED) 348 schedule_work(&backlight_notify_work); 349 350 return NOTIFY_OK; 351 } 352 353 /* 354 * Determine which type of backlight interface to use on this system, 355 * First check cmdline, then dmi quirks, then do autodetect. 356 * 357 * The autodetect order is: 358 * 1) Is the acpi-video backlight interface supported -> 359 * no, use a vendor interface 360 * 2) Is this a win8 "ready" BIOS and do we have a native interface -> 361 * yes, use a native interface 362 * 3) Else use the acpi-video interface 363 * 364 * Arguably the native on win8 check should be done first, but that would 365 * be a behavior change, which may causes issues. 366 */ 367 enum acpi_backlight_type acpi_video_get_backlight_type(void) 368 { 369 static DEFINE_MUTEX(init_mutex); 370 static bool init_done; 371 static long video_caps; 372 373 /* Parse cmdline, dmi and acpi only once */ 374 mutex_lock(&init_mutex); 375 if (!init_done) { 376 acpi_video_parse_cmdline(); 377 dmi_check_system(video_detect_dmi_table); 378 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 379 ACPI_UINT32_MAX, find_video, NULL, 380 &video_caps, NULL); 381 INIT_WORK(&backlight_notify_work, 382 acpi_video_backlight_notify_work); 383 backlight_nb.notifier_call = acpi_video_backlight_notify; 384 backlight_nb.priority = 0; 385 if (backlight_register_notifier(&backlight_nb) == 0) 386 backlight_notifier_registered = true; 387 init_done = true; 388 } 389 mutex_unlock(&init_mutex); 390 391 if (acpi_backlight_cmdline != acpi_backlight_undef) 392 return acpi_backlight_cmdline; 393 394 if (acpi_backlight_dmi != acpi_backlight_undef) 395 return acpi_backlight_dmi; 396 397 if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) 398 return acpi_backlight_vendor; 399 400 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) 401 return acpi_backlight_native; 402 403 return acpi_backlight_video; 404 } 405 EXPORT_SYMBOL(acpi_video_get_backlight_type); 406 407 /* 408 * Set the preferred backlight interface type based on DMI info. 409 * This function allows DMI blacklists to be implemented by external 410 * platform drivers instead of putting a big blacklist in video_detect.c 411 */ 412 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) 413 { 414 acpi_backlight_dmi = type; 415 /* Remove acpi-video backlight interface if it is no longer desired */ 416 if (acpi_video_get_backlight_type() != acpi_backlight_video) 417 acpi_video_unregister_backlight(); 418 } 419 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); 420 421 void __exit acpi_video_detect_exit(void) 422 { 423 if (backlight_notifier_registered) 424 backlight_unregister_notifier(&backlight_nb); 425 } 426