xref: /linux/drivers/acpi/video_detect.c (revision 2da68a77) 
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 which
21  * driver should handle the backlight. RAW/GPU-driver backlight drivers must
22  * use the acpi_video_backlight_use_native() helper for this.
23  *
24  * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
25  * this file will not be compiled and acpi_video_get_backlight_type() will
26  * always return acpi_backlight_vendor.
27  */
28 
29 #include <linux/export.h>
30 #include <linux/acpi.h>
31 #include <linux/apple-gmux.h>
32 #include <linux/backlight.h>
33 #include <linux/dmi.h>
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
37 #include <linux/types.h>
38 #include <linux/workqueue.h>
39 #include <acpi/video.h>
40 
41 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
42 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
43 
44 static void acpi_video_parse_cmdline(void)
45 {
46 	if (!strcmp("vendor", acpi_video_backlight_string))
47 		acpi_backlight_cmdline = acpi_backlight_vendor;
48 	if (!strcmp("video", acpi_video_backlight_string))
49 		acpi_backlight_cmdline = acpi_backlight_video;
50 	if (!strcmp("native", acpi_video_backlight_string))
51 		acpi_backlight_cmdline = acpi_backlight_native;
52 	if (!strcmp("none", acpi_video_backlight_string))
53 		acpi_backlight_cmdline = acpi_backlight_none;
54 }
55 
56 static acpi_status
57 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
58 {
59 	struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
60 	long *cap = context;
61 	struct pci_dev *dev;
62 
63 	static const struct acpi_device_id video_ids[] = {
64 		{ACPI_VIDEO_HID, 0},
65 		{"", 0},
66 	};
67 
68 	if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
69 		dev = acpi_get_pci_dev(handle);
70 		if (!dev)
71 			return AE_OK;
72 		pci_dev_put(dev);
73 		*cap |= acpi_is_video_device(handle);
74 	}
75 	return AE_OK;
76 }
77 
78 /* This depends on ACPI_WMI which is X86 only */
79 #ifdef CONFIG_X86
80 static bool nvidia_wmi_ec_supported(void)
81 {
82 	struct wmi_brightness_args args = {
83 		.mode = WMI_BRIGHTNESS_MODE_GET,
84 		.val = 0,
85 		.ret = 0,
86 	};
87 	struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
88 	acpi_status status;
89 
90 	status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
91 				     WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
92 	if (ACPI_FAILURE(status))
93 		return false;
94 
95 	/*
96 	 * If brightness is handled by the EC then nvidia-wmi-ec-backlight
97 	 * should be used, else the GPU driver(s) should be used.
98 	 */
99 	return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
100 }
101 #else
102 static bool nvidia_wmi_ec_supported(void)
103 {
104 	return false;
105 }
106 #endif
107 
108 /* Force to use vendor driver when the ACPI device is known to be
109  * buggy */
110 static int video_detect_force_vendor(const struct dmi_system_id *d)
111 {
112 	acpi_backlight_dmi = acpi_backlight_vendor;
113 	return 0;
114 }
115 
116 static int video_detect_force_video(const struct dmi_system_id *d)
117 {
118 	acpi_backlight_dmi = acpi_backlight_video;
119 	return 0;
120 }
121 
122 static int video_detect_force_native(const struct dmi_system_id *d)
123 {
124 	acpi_backlight_dmi = acpi_backlight_native;
125 	return 0;
126 }
127 
128 static int video_detect_force_none(const struct dmi_system_id *d)
129 {
130 	acpi_backlight_dmi = acpi_backlight_none;
131 	return 0;
132 }
133 
134 static const struct dmi_system_id video_detect_dmi_table[] = {
135 	/*
136 	 * Models which should use the vendor backlight interface,
137 	 * because of broken ACPI video backlight control.
138 	 */
139 	{
140 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
141 	 .callback = video_detect_force_vendor,
142 	 /* Acer KAV80 */
143 	 .matches = {
144 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
145 		DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
146 		},
147 	},
148 	{
149 	 .callback = video_detect_force_vendor,
150 	 /* Asus UL30VT */
151 	 .matches = {
152 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
153 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
154 		},
155 	},
156 	{
157 	 .callback = video_detect_force_vendor,
158 	 /* Asus UL30A */
159 	 .matches = {
160 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
161 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
162 		},
163 	},
164 	{
165 	 .callback = video_detect_force_vendor,
166 	 /* Asus X55U */
167 	 .matches = {
168 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
169 		DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
170 		},
171 	},
172 	{
173 	 /* https://bugs.launchpad.net/bugs/1000146 */
174 	 .callback = video_detect_force_vendor,
175 	 /* Asus X101CH */
176 	 .matches = {
177 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
178 		DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
179 		},
180 	},
181 	{
182 	 .callback = video_detect_force_vendor,
183 	 /* Asus X401U */
184 	 .matches = {
185 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
186 		DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
187 		},
188 	},
189 	{
190 	 .callback = video_detect_force_vendor,
191 	 /* Asus X501U */
192 	 .matches = {
193 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
194 		DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
195 		},
196 	},
197 	{
198 	 /* https://bugs.launchpad.net/bugs/1000146 */
199 	 .callback = video_detect_force_vendor,
200 	 /* Asus 1015CX */
201 	 .matches = {
202 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
203 		DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
204 		},
205 	},
206 	{
207 	 .callback = video_detect_force_vendor,
208 	 /* Samsung N150/N210/N220 */
209 	 .matches = {
210 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
211 		DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
212 		DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
213 		},
214 	},
215 	{
216 	 .callback = video_detect_force_vendor,
217 	 /* Samsung NF110/NF210/NF310 */
218 	 .matches = {
219 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
220 		DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
221 		DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
222 		},
223 	},
224 	{
225 	 .callback = video_detect_force_vendor,
226 	 /* Samsung NC210 */
227 	 .matches = {
228 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
229 		DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
230 		DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
231 		},
232 	},
233 	{
234 	 .callback = video_detect_force_vendor,
235 	 /* Xiaomi Mi Pad 2 */
236 	 .matches = {
237 			DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
238 			DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
239 		},
240 	},
241 
242 	/*
243 	 * Models which should use the vendor backlight interface,
244 	 * because of broken native backlight control.
245 	 */
246 	{
247 	 .callback = video_detect_force_vendor,
248 	 /* Sony Vaio PCG-FRV35 */
249 	 .matches = {
250 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
251 		DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
252 		},
253 	},
254 
255 	/*
256 	 * Toshiba models with Transflective display, these need to use
257 	 * the toshiba_acpi vendor driver for proper Transflective handling.
258 	 */
259 	{
260 	 .callback = video_detect_force_vendor,
261 	 .matches = {
262 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
263 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
264 		},
265 	},
266 	{
267 	 .callback = video_detect_force_vendor,
268 	 .matches = {
269 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
270 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
271 		},
272 	},
273 
274 	/*
275 	 * These models have a working acpi_video backlight control, and using
276 	 * native backlight causes a regression where backlight does not work
277 	 * when userspace is not handling brightness key events. Disable
278 	 * native_backlight on these to fix this:
279 	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
280 	 */
281 	{
282 	 .callback = video_detect_force_video,
283 	 /* ThinkPad T420 */
284 	 .matches = {
285 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
286 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
287 		},
288 	},
289 	{
290 	 .callback = video_detect_force_video,
291 	 /* ThinkPad T520 */
292 	 .matches = {
293 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
294 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
295 		},
296 	},
297 	{
298 	 .callback = video_detect_force_video,
299 	 /* ThinkPad X201s */
300 	 .matches = {
301 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
302 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
303 		},
304 	},
305 	{
306 	 .callback = video_detect_force_video,
307 	 /* ThinkPad X201T */
308 	 .matches = {
309 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
310 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
311 		},
312 	},
313 
314 	/* The native backlight controls do not work on some older machines */
315 	{
316 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
317 	 .callback = video_detect_force_video,
318 	 /* HP ENVY 15 Notebook */
319 	 .matches = {
320 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
321 		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
322 		},
323 	},
324 	{
325 	 .callback = video_detect_force_video,
326 	 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
327 	 .matches = {
328 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
329 		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
330 		},
331 	},
332 	{
333 	 .callback = video_detect_force_video,
334 	 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
335 	 .matches = {
336 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
337 		DMI_MATCH(DMI_PRODUCT_NAME,
338 			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
339 		},
340 	},
341 	{
342 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
343 	 .callback = video_detect_force_video,
344 	 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
345 	 .matches = {
346 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
347 		DMI_MATCH(DMI_PRODUCT_NAME,
348 			  "3570R/370R/470R/450R/510R/4450RV"),
349 		},
350 	},
351 	{
352 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
353 	 .callback = video_detect_force_video,
354 	 /* SAMSUNG 670Z5E */
355 	 .matches = {
356 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
357 		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
358 		},
359 	},
360 	{
361 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
362 	 .callback = video_detect_force_video,
363 	 /* SAMSUNG 730U3E/740U3E */
364 	 .matches = {
365 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
366 		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
367 		},
368 	},
369 	{
370 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
371 	 .callback = video_detect_force_video,
372 	 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
373 	 .matches = {
374 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
375 		DMI_MATCH(DMI_PRODUCT_NAME,
376 			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
377 		},
378 	},
379 	{
380 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
381 	 .callback = video_detect_force_video,
382 	 /* Dell XPS14 L421X */
383 	 .matches = {
384 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
385 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
386 		},
387 	},
388 	{
389 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
390 	 .callback = video_detect_force_video,
391 	 /* Dell XPS15 L521X */
392 	 .matches = {
393 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
394 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
395 		},
396 	},
397 	{
398 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
399 	 .callback = video_detect_force_video,
400 	 /* SAMSUNG 530U4E/540U4E */
401 	 .matches = {
402 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
403 		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
404 		},
405 	},
406 	{
407 	 /* https://bugs.launchpad.net/bugs/1894667 */
408 	 .callback = video_detect_force_video,
409 	 /* HP 635 Notebook */
410 	 .matches = {
411 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
412 		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
413 		},
414 	},
415 
416 	/* Non win8 machines which need native backlight nevertheless */
417 	{
418 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
419 	 .callback = video_detect_force_native,
420 	 /* Lenovo Ideapad S405 */
421 	 .matches = {
422 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
423 		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
424 		},
425 	},
426 	{
427 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
428 	 .callback = video_detect_force_native,
429 	 /* Lenovo Ideapad Z570 */
430 	 .matches = {
431 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
432 		DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
433 		},
434 	},
435 	{
436 	 .callback = video_detect_force_native,
437 	 /* Lenovo E41-25 */
438 	 .matches = {
439 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
440 		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
441 		},
442 	},
443 	{
444 	 .callback = video_detect_force_native,
445 	 /* Lenovo E41-45 */
446 	 .matches = {
447 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
448 		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
449 		},
450 	},
451 	{
452 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
453 	 .callback = video_detect_force_native,
454 	 /* Apple MacBook Pro 12,1 */
455 	 .matches = {
456 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
457 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
458 		},
459 	},
460 	{
461 	 .callback = video_detect_force_native,
462 	 /* Dell Inspiron N4010 */
463 	 .matches = {
464 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
465 		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
466 		},
467 	},
468 	{
469 	 .callback = video_detect_force_native,
470 	 /* Dell Vostro V131 */
471 	 .matches = {
472 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
473 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
474 		},
475 	},
476 	{
477 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
478 	 .callback = video_detect_force_native,
479 	 /* Dell XPS 17 L702X */
480 	 .matches = {
481 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
482 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
483 		},
484 	},
485 	{
486 	 .callback = video_detect_force_native,
487 	 /* Dell Precision 7510 */
488 	 .matches = {
489 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
490 		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
491 		},
492 	},
493 	{
494 	 .callback = video_detect_force_native,
495 	 /* Acer Aspire 5738z */
496 	 .matches = {
497 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
498 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
499 		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
500 		},
501 	},
502 	{
503 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
504 	 .callback = video_detect_force_native,
505 	 /* Acer Aspire 5741 */
506 	 .matches = {
507 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
508 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
509 		},
510 	},
511 	{
512 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
513 	 .callback = video_detect_force_native,
514 	 /* Acer Aspire 5750 */
515 	 .matches = {
516 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
517 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
518 		},
519 	},
520 	{
521 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
522 	 .callback = video_detect_force_native,
523 	 /* Acer Extensa 5235 */
524 	 .matches = {
525 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
526 		DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
527 		},
528 	},
529 	{
530 	 .callback = video_detect_force_native,
531 	 /* Acer TravelMate 4750 */
532 	 .matches = {
533 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
534 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
535 		},
536 	},
537 	{
538 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
539 	 .callback = video_detect_force_native,
540 	 /* Acer TravelMate 5735Z */
541 	 .matches = {
542 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
543 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
544 		DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
545 		},
546 	},
547 	{
548 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
549 	 .callback = video_detect_force_native,
550 	 /* Acer TravelMate 5760 */
551 	 .matches = {
552 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
553 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
554 		},
555 	},
556 	{
557 	 .callback = video_detect_force_native,
558 	 /* ASUSTeK COMPUTER INC. GA401 */
559 	 .matches = {
560 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
561 		DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
562 		},
563 	},
564 	{
565 	 .callback = video_detect_force_native,
566 	 /* ASUSTeK COMPUTER INC. GA502 */
567 	 .matches = {
568 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
569 		DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
570 		},
571 	},
572 	{
573 	 .callback = video_detect_force_native,
574 	 /* ASUSTeK COMPUTER INC. GA503 */
575 	 .matches = {
576 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
577 		DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
578 		},
579 	},
580 	{
581 	 .callback = video_detect_force_native,
582 	 /* Asus UX303UB */
583 	 .matches = {
584 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
585 		DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
586 		},
587 	},
588 	{
589 	 .callback = video_detect_force_native,
590 	 /* Samsung N150P */
591 	 .matches = {
592 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
593 		DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
594 		DMI_MATCH(DMI_BOARD_NAME, "N150P"),
595 		},
596 	},
597 	{
598 	 .callback = video_detect_force_native,
599 	 /* Samsung N145P/N250P/N260P */
600 	 .matches = {
601 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
602 		DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
603 		DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
604 		},
605 	},
606 	{
607 	 .callback = video_detect_force_native,
608 	 /* Samsung N250P */
609 	 .matches = {
610 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
611 		DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
612 		DMI_MATCH(DMI_BOARD_NAME, "N250P"),
613 		},
614 	},
615 	{
616 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
617 	 .callback = video_detect_force_native,
618 	 /* Sony Vaio VPCEH3U1E */
619 	 .matches = {
620 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
621 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
622 		},
623 	},
624 	{
625 	 .callback = video_detect_force_native,
626 	 /* Sony Vaio VPCY11S1E */
627 	 .matches = {
628 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
629 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
630 		},
631 	},
632 
633 	/*
634 	 * These Toshibas have a broken acpi-video interface for brightness
635 	 * control. They also have an issue where the panel is off after
636 	 * suspend until a special firmware call is made to turn it back
637 	 * on. This is handled by the toshiba_acpi kernel module, so that
638 	 * module must be enabled for these models to work correctly.
639 	 */
640 	{
641 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
642 	 .callback = video_detect_force_native,
643 	 /* Toshiba Portégé R700 */
644 	 .matches = {
645 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
646 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
647 		},
648 	},
649 	{
650 	 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
651 	 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
652 	 .callback = video_detect_force_native,
653 	 /* Toshiba Satellite/Portégé R830 */
654 	 .matches = {
655 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
656 		DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
657 		},
658 	},
659 	{
660 	 .callback = video_detect_force_native,
661 	 /* Toshiba Satellite/Portégé Z830 */
662 	 .matches = {
663 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
664 		DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
665 		},
666 	},
667 
668 	/*
669 	 * Models which have nvidia-ec-wmi support, but should not use it.
670 	 * Note this indicates a likely firmware bug on these models and should
671 	 * be revisited if/when Linux gets support for dynamic mux mode.
672 	 */
673 	{
674 	 .callback = video_detect_force_native,
675 	 /* Dell G15 5515 */
676 	 .matches = {
677 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
678 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
679 		},
680 	},
681 
682 	/*
683 	 * Desktops which falsely report a backlight and which our heuristics
684 	 * for this do not catch.
685 	 */
686 	{
687 	 .callback = video_detect_force_none,
688 	 /* Dell OptiPlex 9020M */
689 	 .matches = {
690 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
691 		DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
692 		},
693 	},
694 	{
695 	 .callback = video_detect_force_none,
696 	 /* GIGABYTE GB-BXBT-2807 */
697 	 .matches = {
698 		DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
699 		DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
700 		},
701 	},
702 	{
703 	 .callback = video_detect_force_none,
704 	 /* MSI MS-7721 */
705 	 .matches = {
706 		DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
707 		DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
708 		},
709 	},
710 	{ },
711 };
712 
713 static bool google_cros_ec_present(void)
714 {
715 	return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
716 }
717 
718 /*
719  * Windows 8 and newer no longer use the ACPI video interface, so it often
720  * does not work. So on win8+ systems prefer native brightness control.
721  * Chromebooks should always prefer native backlight control.
722  */
723 static bool prefer_native_over_acpi_video(void)
724 {
725 	return acpi_osi_is_win8() || google_cros_ec_present();
726 }
727 
728 /*
729  * Determine which type of backlight interface to use on this system,
730  * First check cmdline, then dmi quirks, then do autodetect.
731  */
732 static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
733 {
734 	static DEFINE_MUTEX(init_mutex);
735 	static bool nvidia_wmi_ec_present;
736 	static bool native_available;
737 	static bool init_done;
738 	static long video_caps;
739 
740 	/* Parse cmdline, dmi and acpi only once */
741 	mutex_lock(&init_mutex);
742 	if (!init_done) {
743 		acpi_video_parse_cmdline();
744 		dmi_check_system(video_detect_dmi_table);
745 		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
746 				    ACPI_UINT32_MAX, find_video, NULL,
747 				    &video_caps, NULL);
748 		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
749 		init_done = true;
750 	}
751 	if (native)
752 		native_available = true;
753 	mutex_unlock(&init_mutex);
754 
755 	/*
756 	 * The below heuristics / detection steps are in order of descending
757 	 * presedence. The commandline takes presedence over anything else.
758 	 */
759 	if (acpi_backlight_cmdline != acpi_backlight_undef)
760 		return acpi_backlight_cmdline;
761 
762 	/* DMI quirks override any autodetection. */
763 	if (acpi_backlight_dmi != acpi_backlight_undef)
764 		return acpi_backlight_dmi;
765 
766 	/* Special cases such as nvidia_wmi_ec and apple gmux. */
767 	if (nvidia_wmi_ec_present)
768 		return acpi_backlight_nvidia_wmi_ec;
769 
770 	if (apple_gmux_present())
771 		return acpi_backlight_apple_gmux;
772 
773 	/* Use ACPI video if available, except when native should be preferred. */
774 	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
775 	     !(native_available && prefer_native_over_acpi_video()))
776 		return acpi_backlight_video;
777 
778 	/* Use native if available */
779 	if (native_available)
780 		return acpi_backlight_native;
781 
782 	/* No ACPI video/native (old hw), use vendor specific fw methods. */
783 	return acpi_backlight_vendor;
784 }
785 
786 enum acpi_backlight_type acpi_video_get_backlight_type(void)
787 {
788 	return __acpi_video_get_backlight_type(false);
789 }
790 EXPORT_SYMBOL(acpi_video_get_backlight_type);
791 
792 bool acpi_video_backlight_use_native(void)
793 {
794 	return __acpi_video_get_backlight_type(true) == acpi_backlight_native;
795 }
796 EXPORT_SYMBOL(acpi_video_backlight_use_native);
797