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
acpi_video_parse_cmdline(void)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
find_video(acpi_handle handle,u32 lvl,void * context,void ** rv)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 */
video_detect_force_vendor(const struct dmi_system_id * d)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
video_detect_force_video(const struct dmi_system_id * d)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
video_detect_force_native(const struct dmi_system_id * d)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
video_detect_force_none(const struct dmi_system_id * d)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.suse.com/show_bug.cgi?id=1208724 */
312 .callback = video_detect_force_native,
313 /* Lenovo Ideapad Z470 */
314 .matches = {
315 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
316 DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
317 },
318 },
319 {
320 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
321 .callback = video_detect_force_native,
322 .ident = "Lenovo Ideapad Z570",
323 .matches = {
324 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
325 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
326 },
327 },
328 {
329 .callback = video_detect_force_native,
330 .ident = "Lenovo E41-25",
331 .matches = {
332 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
333 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
334 },
335 },
336 {
337 .callback = video_detect_force_native,
338 .ident = "Lenovo E41-45",
339 .matches = {
340 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
341 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
342 },
343 },
344 {
345 .callback = video_detect_force_native,
346 /* Lenovo ThinkPad X131e (3371 AMD version) */
347 .matches = {
348 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
349 DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
350 },
351 },
352 {
353 .callback = video_detect_force_native,
354 /* Apple iMac11,3 */
355 .matches = {
356 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
357 DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
358 },
359 },
360 {
361 /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
362 .callback = video_detect_force_native,
363 /* Apple iMac12,1 */
364 .matches = {
365 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
366 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
367 },
368 },
369 {
370 /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
371 .callback = video_detect_force_native,
372 /* Apple iMac12,2 */
373 .matches = {
374 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
375 DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
376 },
377 },
378 {
379 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
380 .callback = video_detect_force_native,
381 .ident = "Apple MacBook Pro 12,1",
382 .matches = {
383 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
384 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
385 },
386 },
387 {
388 .callback = video_detect_force_native,
389 .ident = "Dell Vostro V131",
390 .matches = {
391 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
392 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
393 },
394 },
395 {
396 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
397 .callback = video_detect_force_native,
398 .ident = "Dell XPS 17 L702X",
399 .matches = {
400 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
401 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
402 },
403 },
404 {
405 .callback = video_detect_force_native,
406 .ident = "Dell Precision 7510",
407 .matches = {
408 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
409 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
410 },
411 },
412 {
413 .callback = video_detect_force_native,
414 .ident = "Acer Aspire 5738z",
415 .matches = {
416 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
417 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
418 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
419 },
420 },
421 {
422 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
423 .callback = video_detect_force_native,
424 .ident = "Acer TravelMate 5735Z",
425 .matches = {
426 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
427 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
428 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
429 },
430 },
431 {
432 .callback = video_detect_force_native,
433 .ident = "ASUSTeK COMPUTER INC. GA401",
434 .matches = {
435 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
436 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
437 },
438 },
439 {
440 .callback = video_detect_force_native,
441 .ident = "ASUSTeK COMPUTER INC. GA502",
442 .matches = {
443 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
444 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
445 },
446 },
447 {
448 .callback = video_detect_force_native,
449 .ident = "ASUSTeK COMPUTER INC. GA503",
450 .matches = {
451 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
452 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
453 },
454 },
455 /*
456 * Clevo NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2 have both a
457 * working native and video interface. However the default detection
458 * mechanism first registers the video interface before unregistering
459 * it again and switching to the native interface during boot. This
460 * results in a dangling SBIOS request for backlight change for some
461 * reason, causing the backlight to switch to ~2% once per boot on the
462 * first power cord connect or disconnect event. Setting the native
463 * interface explicitly circumvents this buggy behaviour, by avoiding
464 * the unregistering process.
465 */
466 {
467 .callback = video_detect_force_native,
468 .ident = "Clevo NL5xRU",
469 .matches = {
470 DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
471 },
472 },
473 {
474 .callback = video_detect_force_native,
475 .ident = "Clevo NL5xRU",
476 .matches = {
477 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
478 DMI_MATCH(DMI_BOARD_NAME, "AURA1501"),
479 },
480 },
481 {
482 .callback = video_detect_force_native,
483 .ident = "Clevo NL5xRU",
484 .matches = {
485 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
486 DMI_MATCH(DMI_BOARD_NAME, "EDUBOOK1502"),
487 },
488 },
489 {
490 .callback = video_detect_force_native,
491 .ident = "Clevo NL5xNU",
492 .matches = {
493 DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
494 },
495 },
496 /*
497 * The TongFang PF5PU1G, PF4NU1F, PF5NU1G, and PF5LUXG/TUXEDO BA15 Gen10,
498 * Pulse 14/15 Gen1, and Pulse 15 Gen2 have the same problem as the Clevo
499 * NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2. See the description
500 * above.
501 */
502 {
503 .callback = video_detect_force_native,
504 .ident = "TongFang PF5PU1G",
505 .matches = {
506 DMI_MATCH(DMI_BOARD_NAME, "PF5PU1G"),
507 },
508 },
509 {
510 .callback = video_detect_force_native,
511 .ident = "TongFang PF4NU1F",
512 .matches = {
513 DMI_MATCH(DMI_BOARD_NAME, "PF4NU1F"),
514 },
515 },
516 {
517 .callback = video_detect_force_native,
518 .ident = "TongFang PF4NU1F",
519 .matches = {
520 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
521 DMI_MATCH(DMI_BOARD_NAME, "PULSE1401"),
522 },
523 },
524 {
525 .callback = video_detect_force_native,
526 .ident = "TongFang PF5NU1G",
527 .matches = {
528 DMI_MATCH(DMI_BOARD_NAME, "PF5NU1G"),
529 },
530 },
531 {
532 .callback = video_detect_force_native,
533 .ident = "TongFang PF5NU1G",
534 .matches = {
535 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
536 DMI_MATCH(DMI_BOARD_NAME, "PULSE1501"),
537 },
538 },
539 {
540 .callback = video_detect_force_native,
541 .ident = "TongFang PF5LUXG",
542 .matches = {
543 DMI_MATCH(DMI_BOARD_NAME, "PF5LUXG"),
544 },
545 },
546 /*
547 * More Tongfang devices with the same issue as the Clevo NL5xRU and
548 * NL5xNU/TUXEDO Aura 15 Gen1 and Gen2. See the description above.
549 */
550 {
551 .callback = video_detect_force_native,
552 .ident = "TongFang GKxNRxx",
553 .matches = {
554 DMI_MATCH(DMI_BOARD_NAME, "GKxNRxx"),
555 },
556 },
557 {
558 .callback = video_detect_force_native,
559 .ident = "TongFang GKxNRxx",
560 .matches = {
561 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
562 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1501A1650TI"),
563 },
564 },
565 {
566 .callback = video_detect_force_native,
567 .ident = "TongFang GKxNRxx",
568 .matches = {
569 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
570 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1501A2060"),
571 },
572 },
573 {
574 .callback = video_detect_force_native,
575 .ident = "TongFang GKxNRxx",
576 .matches = {
577 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
578 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1701A1650TI"),
579 },
580 },
581 {
582 .callback = video_detect_force_native,
583 .ident = "TongFang GKxNRxx",
584 .matches = {
585 DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
586 DMI_MATCH(DMI_BOARD_NAME, "POLARIS1701A2060"),
587 },
588 },
589 {
590 .callback = video_detect_force_native,
591 .ident = "TongFang GMxNGxx",
592 .matches = {
593 DMI_MATCH(DMI_BOARD_NAME, "GMxNGxx"),
594 },
595 },
596 {
597 .callback = video_detect_force_native,
598 .ident = "TongFang GMxZGxx",
599 .matches = {
600 DMI_MATCH(DMI_BOARD_NAME, "GMxZGxx"),
601 },
602 },
603 {
604 .callback = video_detect_force_native,
605 .ident = "TongFang GMxRGxx",
606 .matches = {
607 DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"),
608 },
609 },
610 /*
611 * Desktops which falsely report a backlight and which our heuristics
612 * for this do not catch.
613 */
614 {
615 .callback = video_detect_force_none,
616 .ident = "Dell OptiPlex 9020M",
617 .matches = {
618 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
619 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
620 },
621 },
622 {
623 .callback = video_detect_force_none,
624 .ident = "MSI MS-7721",
625 .matches = {
626 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
627 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
628 },
629 },
630 { },
631 };
632
633 /* This uses a workqueue to avoid various locking ordering issues */
acpi_video_backlight_notify_work(struct work_struct * work)634 static void acpi_video_backlight_notify_work(struct work_struct *work)
635 {
636 if (acpi_video_get_backlight_type() != acpi_backlight_video)
637 acpi_video_unregister_backlight();
638 }
639
acpi_video_backlight_notify(struct notifier_block * nb,unsigned long val,void * bd)640 static int acpi_video_backlight_notify(struct notifier_block *nb,
641 unsigned long val, void *bd)
642 {
643 struct backlight_device *backlight = bd;
644
645 /* A raw bl registering may change video -> native */
646 if (backlight->props.type == BACKLIGHT_RAW &&
647 val == BACKLIGHT_REGISTERED)
648 schedule_work(&backlight_notify_work);
649
650 return NOTIFY_OK;
651 }
652
653 /*
654 * Determine which type of backlight interface to use on this system,
655 * First check cmdline, then dmi quirks, then do autodetect.
656 *
657 * The autodetect order is:
658 * 1) Is the acpi-video backlight interface supported ->
659 * no, use a vendor interface
660 * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
661 * yes, use a native interface
662 * 3) Else use the acpi-video interface
663 *
664 * Arguably the native on win8 check should be done first, but that would
665 * be a behavior change, which may causes issues.
666 */
acpi_video_get_backlight_type(void)667 enum acpi_backlight_type acpi_video_get_backlight_type(void)
668 {
669 static DEFINE_MUTEX(init_mutex);
670 static bool init_done;
671 static long video_caps;
672
673 /* Parse cmdline, dmi and acpi only once */
674 mutex_lock(&init_mutex);
675 if (!init_done) {
676 acpi_video_parse_cmdline();
677 dmi_check_system(video_detect_dmi_table);
678 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
679 ACPI_UINT32_MAX, find_video, NULL,
680 &video_caps, NULL);
681 INIT_WORK(&backlight_notify_work,
682 acpi_video_backlight_notify_work);
683 backlight_nb.notifier_call = acpi_video_backlight_notify;
684 backlight_nb.priority = 0;
685 if (backlight_register_notifier(&backlight_nb) == 0)
686 backlight_notifier_registered = true;
687 init_done = true;
688 }
689 mutex_unlock(&init_mutex);
690
691 if (acpi_backlight_cmdline != acpi_backlight_undef)
692 return acpi_backlight_cmdline;
693
694 if (acpi_backlight_dmi != acpi_backlight_undef)
695 return acpi_backlight_dmi;
696
697 if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
698 return acpi_backlight_vendor;
699
700 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
701 return acpi_backlight_native;
702
703 return acpi_backlight_video;
704 }
705 EXPORT_SYMBOL(acpi_video_get_backlight_type);
706
707 /*
708 * Set the preferred backlight interface type based on DMI info.
709 * This function allows DMI blacklists to be implemented by external
710 * platform drivers instead of putting a big blacklist in video_detect.c
711 */
acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)712 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
713 {
714 acpi_backlight_dmi = type;
715 /* Remove acpi-video backlight interface if it is no longer desired */
716 if (acpi_video_get_backlight_type() != acpi_backlight_video)
717 acpi_video_unregister_backlight();
718 }
719 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
720
acpi_video_detect_exit(void)721 void __exit acpi_video_detect_exit(void)
722 {
723 if (backlight_notifier_registered)
724 backlight_unregister_notifier(&backlight_nb);
725 }
726