xref: /openbmc/linux/drivers/acpi/video_detect.c (revision 9ad685db) 
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/pnp.h>
38 #include <linux/types.h>
39 #include <linux/workqueue.h>
40 #include <acpi/video.h>
41 
42 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
43 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
44 
45 static void acpi_video_parse_cmdline(void)
46 {
47 	if (!strcmp("vendor", acpi_video_backlight_string))
48 		acpi_backlight_cmdline = acpi_backlight_vendor;
49 	if (!strcmp("video", acpi_video_backlight_string))
50 		acpi_backlight_cmdline = acpi_backlight_video;
51 	if (!strcmp("native", acpi_video_backlight_string))
52 		acpi_backlight_cmdline = acpi_backlight_native;
53 	if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
54 		acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
55 	if (!strcmp("apple_gmux", acpi_video_backlight_string))
56 		acpi_backlight_cmdline = acpi_backlight_apple_gmux;
57 	if (!strcmp("none", acpi_video_backlight_string))
58 		acpi_backlight_cmdline = acpi_backlight_none;
59 }
60 
61 static acpi_status
62 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
63 {
64 	struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
65 	long *cap = context;
66 	struct pci_dev *dev;
67 
68 	static const struct acpi_device_id video_ids[] = {
69 		{ACPI_VIDEO_HID, 0},
70 		{"", 0},
71 	};
72 
73 	if (acpi_dev && !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 /* This depends on ACPI_WMI which is X86 only */
84 #ifdef CONFIG_X86
85 static bool nvidia_wmi_ec_supported(void)
86 {
87 	struct wmi_brightness_args args = {
88 		.mode = WMI_BRIGHTNESS_MODE_GET,
89 		.val = 0,
90 		.ret = 0,
91 	};
92 	struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
93 	acpi_status status;
94 
95 	status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
96 				     WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
97 	if (ACPI_FAILURE(status))
98 		return false;
99 
100 	/*
101 	 * If brightness is handled by the EC then nvidia-wmi-ec-backlight
102 	 * should be used, else the GPU driver(s) should be used.
103 	 */
104 	return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
105 }
106 #else
107 static bool nvidia_wmi_ec_supported(void)
108 {
109 	return false;
110 }
111 #endif
112 
113 /* Force to use vendor driver when the ACPI device is known to be
114  * buggy */
115 static int video_detect_force_vendor(const struct dmi_system_id *d)
116 {
117 	acpi_backlight_dmi = acpi_backlight_vendor;
118 	return 0;
119 }
120 
121 static int video_detect_force_video(const struct dmi_system_id *d)
122 {
123 	acpi_backlight_dmi = acpi_backlight_video;
124 	return 0;
125 }
126 
127 static int video_detect_force_native(const struct dmi_system_id *d)
128 {
129 	acpi_backlight_dmi = acpi_backlight_native;
130 	return 0;
131 }
132 
133 static const struct dmi_system_id video_detect_dmi_table[] = {
134 	/*
135 	 * Models which should use the vendor backlight interface,
136 	 * because of broken ACPI video backlight control.
137 	 */
138 	{
139 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
140 	 .callback = video_detect_force_vendor,
141 	 /* Acer KAV80 */
142 	 .matches = {
143 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
144 		DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
145 		},
146 	},
147 	{
148 	 .callback = video_detect_force_vendor,
149 	 /* Asus UL30VT */
150 	 .matches = {
151 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
152 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
153 		},
154 	},
155 	{
156 	 .callback = video_detect_force_vendor,
157 	 /* Asus UL30A */
158 	 .matches = {
159 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
160 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
161 		},
162 	},
163 	{
164 	 .callback = video_detect_force_vendor,
165 	 /* Asus X55U */
166 	 .matches = {
167 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
168 		DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
169 		},
170 	},
171 	{
172 	 /* https://bugs.launchpad.net/bugs/1000146 */
173 	 .callback = video_detect_force_vendor,
174 	 /* Asus X101CH */
175 	 .matches = {
176 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
177 		DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
178 		},
179 	},
180 	{
181 	 .callback = video_detect_force_vendor,
182 	 /* Asus X401U */
183 	 .matches = {
184 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
185 		DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
186 		},
187 	},
188 	{
189 	 .callback = video_detect_force_vendor,
190 	 /* Asus X501U */
191 	 .matches = {
192 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
193 		DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
194 		},
195 	},
196 	{
197 	 /* https://bugs.launchpad.net/bugs/1000146 */
198 	 .callback = video_detect_force_vendor,
199 	 /* Asus 1015CX */
200 	 .matches = {
201 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
202 		DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
203 		},
204 	},
205 	{
206 	 .callback = video_detect_force_vendor,
207 	 /* Samsung N150/N210/N220 */
208 	 .matches = {
209 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
210 		DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
211 		DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
212 		},
213 	},
214 	{
215 	 .callback = video_detect_force_vendor,
216 	 /* Samsung NF110/NF210/NF310 */
217 	 .matches = {
218 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
219 		DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
220 		DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
221 		},
222 	},
223 	{
224 	 .callback = video_detect_force_vendor,
225 	 /* Samsung NC210 */
226 	 .matches = {
227 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
228 		DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
229 		DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
230 		},
231 	},
232 	{
233 	 .callback = video_detect_force_vendor,
234 	 /* Xiaomi Mi Pad 2 */
235 	 .matches = {
236 			DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
237 			DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
238 		},
239 	},
240 
241 	/*
242 	 * Models which should use the vendor backlight interface,
243 	 * because of broken native backlight control.
244 	 */
245 	{
246 	 .callback = video_detect_force_vendor,
247 	 /* Sony Vaio PCG-FRV35 */
248 	 .matches = {
249 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
250 		DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
251 		},
252 	},
253 
254 	/*
255 	 * Toshiba models with Transflective display, these need to use
256 	 * the toshiba_acpi vendor driver for proper Transflective handling.
257 	 */
258 	{
259 	 .callback = video_detect_force_vendor,
260 	 .matches = {
261 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
262 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
263 		},
264 	},
265 	{
266 	 .callback = video_detect_force_vendor,
267 	 .matches = {
268 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
269 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
270 		},
271 	},
272 
273 	/*
274 	 * Models which need acpi_video backlight control where the GPU drivers
275 	 * do not call acpi_video_register_backlight() because no internal panel
276 	 * is detected. Typically these are all-in-ones (monitors with builtin
277 	 * PC) where the panel connection shows up as regular DP instead of eDP.
278 	 */
279 	{
280 	 .callback = video_detect_force_video,
281 	 /* Apple iMac14,1 */
282 	 .matches = {
283 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
284 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
285 		},
286 	},
287 	{
288 	 .callback = video_detect_force_video,
289 	 /* Apple iMac14,2 */
290 	 .matches = {
291 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
292 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
293 		},
294 	},
295 
296 	/*
297 	 * Older models with nvidia GPU which need acpi_video backlight
298 	 * control and where the old nvidia binary driver series does not
299 	 * call acpi_video_register_backlight().
300 	 */
301 	{
302 	 .callback = video_detect_force_video,
303 	 /* ThinkPad W530 */
304 	 .matches = {
305 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
306 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
307 		},
308 	},
309 
310 	/*
311 	 * These models have a working acpi_video backlight control, and using
312 	 * native backlight causes a regression where backlight does not work
313 	 * when userspace is not handling brightness key events. Disable
314 	 * native_backlight on these to fix this:
315 	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
316 	 */
317 	{
318 	 .callback = video_detect_force_video,
319 	 /* ThinkPad T420 */
320 	 .matches = {
321 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
322 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
323 		},
324 	},
325 	{
326 	 .callback = video_detect_force_video,
327 	 /* ThinkPad T520 */
328 	 .matches = {
329 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
330 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
331 		},
332 	},
333 	{
334 	 .callback = video_detect_force_video,
335 	 /* ThinkPad X201s */
336 	 .matches = {
337 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
338 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
339 		},
340 	},
341 	{
342 	 .callback = video_detect_force_video,
343 	 /* ThinkPad X201T */
344 	 .matches = {
345 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
346 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
347 		},
348 	},
349 
350 	/* The native backlight controls do not work on some older machines */
351 	{
352 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
353 	 .callback = video_detect_force_video,
354 	 /* HP ENVY 15 Notebook */
355 	 .matches = {
356 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
357 		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
358 		},
359 	},
360 	{
361 	 .callback = video_detect_force_video,
362 	 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
363 	 .matches = {
364 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
365 		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
366 		},
367 	},
368 	{
369 	 .callback = video_detect_force_video,
370 	 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
371 	 .matches = {
372 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
373 		DMI_MATCH(DMI_PRODUCT_NAME,
374 			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
375 		},
376 	},
377 	{
378 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
379 	 .callback = video_detect_force_video,
380 	 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
381 	 .matches = {
382 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
383 		DMI_MATCH(DMI_PRODUCT_NAME,
384 			  "3570R/370R/470R/450R/510R/4450RV"),
385 		},
386 	},
387 	{
388 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
389 	 .callback = video_detect_force_video,
390 	 /* SAMSUNG 670Z5E */
391 	 .matches = {
392 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
393 		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
394 		},
395 	},
396 	{
397 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
398 	 .callback = video_detect_force_video,
399 	 /* SAMSUNG 730U3E/740U3E */
400 	 .matches = {
401 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
402 		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
403 		},
404 	},
405 	{
406 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
407 	 .callback = video_detect_force_video,
408 	 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
409 	 .matches = {
410 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
411 		DMI_MATCH(DMI_PRODUCT_NAME,
412 			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
413 		},
414 	},
415 	{
416 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
417 	 .callback = video_detect_force_video,
418 	 /* Dell XPS14 L421X */
419 	 .matches = {
420 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
421 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
422 		},
423 	},
424 	{
425 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
426 	 .callback = video_detect_force_video,
427 	 /* Dell XPS15 L521X */
428 	 .matches = {
429 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
430 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
431 		},
432 	},
433 	{
434 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
435 	 .callback = video_detect_force_video,
436 	 /* SAMSUNG 530U4E/540U4E */
437 	 .matches = {
438 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
439 		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
440 		},
441 	},
442 	{
443 	 /* https://bugs.launchpad.net/bugs/1894667 */
444 	 .callback = video_detect_force_video,
445 	 /* HP 635 Notebook */
446 	 .matches = {
447 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
448 		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
449 		},
450 	},
451 
452 	/* Non win8 machines which need native backlight nevertheless */
453 	{
454 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
455 	 .callback = video_detect_force_native,
456 	 /* Lenovo Ideapad S405 */
457 	 .matches = {
458 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
459 		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
460 		},
461 	},
462 	{
463 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
464 	 .callback = video_detect_force_native,
465 	 /* Lenovo Ideapad Z570 */
466 	 .matches = {
467 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
468 		DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
469 		},
470 	},
471 	{
472 	 .callback = video_detect_force_native,
473 	 /* Lenovo E41-25 */
474 	 .matches = {
475 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
476 		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
477 		},
478 	},
479 	{
480 	 .callback = video_detect_force_native,
481 	 /* Lenovo E41-45 */
482 	 .matches = {
483 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
484 		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
485 		},
486 	},
487 	{
488 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
489 	 .callback = video_detect_force_native,
490 	 /* Apple MacBook Pro 12,1 */
491 	 .matches = {
492 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
493 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
494 		},
495 	},
496 	{
497 	 .callback = video_detect_force_native,
498 	 /* Dell Inspiron N4010 */
499 	 .matches = {
500 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
501 		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
502 		},
503 	},
504 	{
505 	 .callback = video_detect_force_native,
506 	 /* Dell Vostro V131 */
507 	 .matches = {
508 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
509 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
510 		},
511 	},
512 	{
513 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
514 	 .callback = video_detect_force_native,
515 	 /* Dell XPS 17 L702X */
516 	 .matches = {
517 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
518 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
519 		},
520 	},
521 	{
522 	 .callback = video_detect_force_native,
523 	 /* Dell Precision 7510 */
524 	 .matches = {
525 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
526 		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
527 		},
528 	},
529 	{
530 	 .callback = video_detect_force_native,
531 	 /* Acer Aspire 3830TG */
532 	 .matches = {
533 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
534 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
535 		},
536 	},
537 	{
538 	 .callback = video_detect_force_native,
539 	 /* Acer Aspire 4810T */
540 	 .matches = {
541 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
542 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
543 		},
544 	},
545 	{
546 	 .callback = video_detect_force_native,
547 	 /* Acer Aspire 5738z */
548 	 .matches = {
549 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
550 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
551 		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
552 		},
553 	},
554 	{
555 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
556 	 .callback = video_detect_force_native,
557 	 /* Acer Aspire 5741 */
558 	 .matches = {
559 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
560 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
561 		},
562 	},
563 	{
564 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
565 	 .callback = video_detect_force_native,
566 	 /* Acer Aspire 5750 */
567 	 .matches = {
568 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
569 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
570 		},
571 	},
572 	{
573 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
574 	 .callback = video_detect_force_native,
575 	 /* Acer Extensa 5235 */
576 	 .matches = {
577 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
578 		DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
579 		},
580 	},
581 	{
582 	 .callback = video_detect_force_native,
583 	 /* Acer TravelMate 4750 */
584 	 .matches = {
585 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
586 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
587 		},
588 	},
589 	{
590 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
591 	 .callback = video_detect_force_native,
592 	 /* Acer TravelMate 5735Z */
593 	 .matches = {
594 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
595 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
596 		DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
597 		},
598 	},
599 	{
600 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
601 	 .callback = video_detect_force_native,
602 	 /* Acer TravelMate 5760 */
603 	 .matches = {
604 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
605 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
606 		},
607 	},
608 	{
609 	 .callback = video_detect_force_native,
610 	 /* ASUSTeK COMPUTER INC. GA401 */
611 	 .matches = {
612 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
613 		DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
614 		},
615 	},
616 	{
617 	 .callback = video_detect_force_native,
618 	 /* ASUSTeK COMPUTER INC. GA502 */
619 	 .matches = {
620 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
621 		DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
622 		},
623 	},
624 	{
625 	 .callback = video_detect_force_native,
626 	 /* ASUSTeK COMPUTER INC. GA503 */
627 	 .matches = {
628 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
629 		DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
630 		},
631 	},
632 	{
633 	 .callback = video_detect_force_native,
634 	 /* Asus U46E */
635 	 .matches = {
636 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
637 		DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
638 		},
639 	},
640 	{
641 	 .callback = video_detect_force_native,
642 	 /* Asus UX303UB */
643 	 .matches = {
644 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
645 		DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
646 		},
647 	},
648 	{
649 	 .callback = video_detect_force_native,
650 	 /* HP EliteBook 8460p */
651 	 .matches = {
652 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
653 		DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
654 		},
655 	},
656 	{
657 	 .callback = video_detect_force_native,
658 	 /* HP Pavilion g6-1d80nr / B4U19UA */
659 	 .matches = {
660 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
661 		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
662 		DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
663 		},
664 	},
665 	{
666 	 .callback = video_detect_force_native,
667 	 /* Samsung N150P */
668 	 .matches = {
669 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
670 		DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
671 		DMI_MATCH(DMI_BOARD_NAME, "N150P"),
672 		},
673 	},
674 	{
675 	 .callback = video_detect_force_native,
676 	 /* Samsung N145P/N250P/N260P */
677 	 .matches = {
678 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
679 		DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
680 		DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
681 		},
682 	},
683 	{
684 	 .callback = video_detect_force_native,
685 	 /* Samsung N250P */
686 	 .matches = {
687 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
688 		DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
689 		DMI_MATCH(DMI_BOARD_NAME, "N250P"),
690 		},
691 	},
692 	{
693 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
694 	 .callback = video_detect_force_native,
695 	 /* Sony Vaio VPCEH3U1E */
696 	 .matches = {
697 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
698 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
699 		},
700 	},
701 	{
702 	 .callback = video_detect_force_native,
703 	 /* Sony Vaio VPCY11S1E */
704 	 .matches = {
705 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
706 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
707 		},
708 	},
709 
710 	/*
711 	 * These Toshibas have a broken acpi-video interface for brightness
712 	 * control. They also have an issue where the panel is off after
713 	 * suspend until a special firmware call is made to turn it back
714 	 * on. This is handled by the toshiba_acpi kernel module, so that
715 	 * module must be enabled for these models to work correctly.
716 	 */
717 	{
718 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
719 	 .callback = video_detect_force_native,
720 	 /* Toshiba Portégé R700 */
721 	 .matches = {
722 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
723 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
724 		},
725 	},
726 	{
727 	 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
728 	 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
729 	 .callback = video_detect_force_native,
730 	 /* Toshiba Satellite/Portégé R830 */
731 	 .matches = {
732 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
733 		DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
734 		},
735 	},
736 	{
737 	 .callback = video_detect_force_native,
738 	 /* Toshiba Satellite/Portégé Z830 */
739 	 .matches = {
740 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
741 		DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
742 		},
743 	},
744 
745 	/*
746 	 * Models which have nvidia-ec-wmi support, but should not use it.
747 	 * Note this indicates a likely firmware bug on these models and should
748 	 * be revisited if/when Linux gets support for dynamic mux mode.
749 	 */
750 	{
751 	 .callback = video_detect_force_native,
752 	 /* Dell G15 5515 */
753 	 .matches = {
754 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
755 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
756 		},
757 	},
758 	{
759 	 .callback = video_detect_force_native,
760 	 .matches = {
761 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
762 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
763 		},
764 	},
765 	{ },
766 };
767 
768 static bool google_cros_ec_present(void)
769 {
770 	return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
771 }
772 
773 /*
774  * Windows 8 and newer no longer use the ACPI video interface, so it often
775  * does not work. So on win8+ systems prefer native brightness control.
776  * Chromebooks should always prefer native backlight control.
777  */
778 static bool prefer_native_over_acpi_video(void)
779 {
780 	return acpi_osi_is_win8() || google_cros_ec_present();
781 }
782 
783 /*
784  * Determine which type of backlight interface to use on this system,
785  * First check cmdline, then dmi quirks, then do autodetect.
786  */
787 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
788 {
789 	static DEFINE_MUTEX(init_mutex);
790 	static bool nvidia_wmi_ec_present;
791 	static bool apple_gmux_present;
792 	static bool native_available;
793 	static bool init_done;
794 	static long video_caps;
795 
796 	/* Parse cmdline, dmi and acpi only once */
797 	mutex_lock(&init_mutex);
798 	if (!init_done) {
799 		acpi_video_parse_cmdline();
800 		dmi_check_system(video_detect_dmi_table);
801 		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
802 				    ACPI_UINT32_MAX, find_video, NULL,
803 				    &video_caps, NULL);
804 		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
805 		apple_gmux_present = apple_gmux_detect(NULL, NULL);
806 		init_done = true;
807 	}
808 	if (native)
809 		native_available = true;
810 	mutex_unlock(&init_mutex);
811 
812 	if (auto_detect)
813 		*auto_detect = false;
814 
815 	/*
816 	 * The below heuristics / detection steps are in order of descending
817 	 * presedence. The commandline takes presedence over anything else.
818 	 */
819 	if (acpi_backlight_cmdline != acpi_backlight_undef)
820 		return acpi_backlight_cmdline;
821 
822 	/* DMI quirks override any autodetection. */
823 	if (acpi_backlight_dmi != acpi_backlight_undef)
824 		return acpi_backlight_dmi;
825 
826 	if (auto_detect)
827 		*auto_detect = true;
828 
829 	/* Special cases such as nvidia_wmi_ec and apple gmux. */
830 	if (nvidia_wmi_ec_present)
831 		return acpi_backlight_nvidia_wmi_ec;
832 
833 	if (apple_gmux_present)
834 		return acpi_backlight_apple_gmux;
835 
836 	/* Use ACPI video if available, except when native should be preferred. */
837 	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
838 	     !(native_available && prefer_native_over_acpi_video()))
839 		return acpi_backlight_video;
840 
841 	/* Use native if available */
842 	if (native_available)
843 		return acpi_backlight_native;
844 
845 	/* No ACPI video/native (old hw), use vendor specific fw methods. */
846 	return acpi_backlight_vendor;
847 }
848 EXPORT_SYMBOL(__acpi_video_get_backlight_type);
849