xref: /openbmc/linux/drivers/acpi/video_detect.c (revision 09e61efd) 
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("none", acpi_video_backlight_string))
54 		acpi_backlight_cmdline = acpi_backlight_none;
55 }
56 
57 static acpi_status
58 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
59 {
60 	struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
61 	long *cap = context;
62 	struct pci_dev *dev;
63 
64 	static const struct acpi_device_id video_ids[] = {
65 		{ACPI_VIDEO_HID, 0},
66 		{"", 0},
67 	};
68 
69 	if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
70 		dev = acpi_get_pci_dev(handle);
71 		if (!dev)
72 			return AE_OK;
73 		pci_dev_put(dev);
74 		*cap |= acpi_is_video_device(handle);
75 	}
76 	return AE_OK;
77 }
78 
79 /* This depends on ACPI_WMI which is X86 only */
80 #ifdef CONFIG_X86
81 static bool nvidia_wmi_ec_supported(void)
82 {
83 	struct wmi_brightness_args args = {
84 		.mode = WMI_BRIGHTNESS_MODE_GET,
85 		.val = 0,
86 		.ret = 0,
87 	};
88 	struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
89 	acpi_status status;
90 
91 	status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
92 				     WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
93 	if (ACPI_FAILURE(status))
94 		return false;
95 
96 	/*
97 	 * If brightness is handled by the EC then nvidia-wmi-ec-backlight
98 	 * should be used, else the GPU driver(s) should be used.
99 	 */
100 	return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
101 }
102 #else
103 static bool nvidia_wmi_ec_supported(void)
104 {
105 	return false;
106 }
107 #endif
108 
109 static bool apple_gmux_backlight_present(void)
110 {
111 	struct acpi_device *adev;
112 	struct device *dev;
113 
114 	adev = acpi_dev_get_first_match_dev(GMUX_ACPI_HID, NULL, -1);
115 	if (!adev)
116 		return false;
117 
118 	dev = acpi_get_first_physical_node(adev);
119 	if (!dev)
120 		return false;
121 
122 	/*
123 	 * drivers/platform/x86/apple-gmux.c only supports old style
124 	 * Apple GMUX with an IO-resource.
125 	 */
126 	return pnp_get_resource(to_pnp_dev(dev), IORESOURCE_IO, 0) != NULL;
127 }
128 
129 /* Force to use vendor driver when the ACPI device is known to be
130  * buggy */
131 static int video_detect_force_vendor(const struct dmi_system_id *d)
132 {
133 	acpi_backlight_dmi = acpi_backlight_vendor;
134 	return 0;
135 }
136 
137 static int video_detect_force_video(const struct dmi_system_id *d)
138 {
139 	acpi_backlight_dmi = acpi_backlight_video;
140 	return 0;
141 }
142 
143 static int video_detect_force_native(const struct dmi_system_id *d)
144 {
145 	acpi_backlight_dmi = acpi_backlight_native;
146 	return 0;
147 }
148 
149 static int video_detect_force_none(const struct dmi_system_id *d)
150 {
151 	acpi_backlight_dmi = acpi_backlight_none;
152 	return 0;
153 }
154 
155 static const struct dmi_system_id video_detect_dmi_table[] = {
156 	/*
157 	 * Models which should use the vendor backlight interface,
158 	 * because of broken ACPI video backlight control.
159 	 */
160 	{
161 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
162 	 .callback = video_detect_force_vendor,
163 	 /* Acer KAV80 */
164 	 .matches = {
165 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
166 		DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
167 		},
168 	},
169 	{
170 	 .callback = video_detect_force_vendor,
171 	 /* Asus UL30VT */
172 	 .matches = {
173 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
174 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
175 		},
176 	},
177 	{
178 	 .callback = video_detect_force_vendor,
179 	 /* Asus UL30A */
180 	 .matches = {
181 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
182 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
183 		},
184 	},
185 	{
186 	 .callback = video_detect_force_vendor,
187 	 /* Asus X55U */
188 	 .matches = {
189 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
190 		DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
191 		},
192 	},
193 	{
194 	 /* https://bugs.launchpad.net/bugs/1000146 */
195 	 .callback = video_detect_force_vendor,
196 	 /* Asus X101CH */
197 	 .matches = {
198 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
199 		DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
200 		},
201 	},
202 	{
203 	 .callback = video_detect_force_vendor,
204 	 /* Asus X401U */
205 	 .matches = {
206 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
207 		DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
208 		},
209 	},
210 	{
211 	 .callback = video_detect_force_vendor,
212 	 /* Asus X501U */
213 	 .matches = {
214 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
215 		DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
216 		},
217 	},
218 	{
219 	 /* https://bugs.launchpad.net/bugs/1000146 */
220 	 .callback = video_detect_force_vendor,
221 	 /* Asus 1015CX */
222 	 .matches = {
223 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
224 		DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
225 		},
226 	},
227 	{
228 	 .callback = video_detect_force_vendor,
229 	 /* Samsung N150/N210/N220 */
230 	 .matches = {
231 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
232 		DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
233 		DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
234 		},
235 	},
236 	{
237 	 .callback = video_detect_force_vendor,
238 	 /* Samsung NF110/NF210/NF310 */
239 	 .matches = {
240 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
241 		DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
242 		DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
243 		},
244 	},
245 	{
246 	 .callback = video_detect_force_vendor,
247 	 /* Samsung NC210 */
248 	 .matches = {
249 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
250 		DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
251 		DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
252 		},
253 	},
254 	{
255 	 .callback = video_detect_force_vendor,
256 	 /* Xiaomi Mi Pad 2 */
257 	 .matches = {
258 			DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
259 			DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
260 		},
261 	},
262 
263 	/*
264 	 * Models which should use the vendor backlight interface,
265 	 * because of broken native backlight control.
266 	 */
267 	{
268 	 .callback = video_detect_force_vendor,
269 	 /* Sony Vaio PCG-FRV35 */
270 	 .matches = {
271 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
272 		DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
273 		},
274 	},
275 
276 	/*
277 	 * Toshiba models with Transflective display, these need to use
278 	 * the toshiba_acpi vendor driver for proper Transflective handling.
279 	 */
280 	{
281 	 .callback = video_detect_force_vendor,
282 	 .matches = {
283 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
284 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
285 		},
286 	},
287 	{
288 	 .callback = video_detect_force_vendor,
289 	 .matches = {
290 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
291 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
292 		},
293 	},
294 
295 	/*
296 	 * These models have a working acpi_video backlight control, and using
297 	 * native backlight causes a regression where backlight does not work
298 	 * when userspace is not handling brightness key events. Disable
299 	 * native_backlight on these to fix this:
300 	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
301 	 */
302 	{
303 	 .callback = video_detect_force_video,
304 	 /* ThinkPad T420 */
305 	 .matches = {
306 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
307 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
308 		},
309 	},
310 	{
311 	 .callback = video_detect_force_video,
312 	 /* ThinkPad T520 */
313 	 .matches = {
314 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
315 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
316 		},
317 	},
318 	{
319 	 .callback = video_detect_force_video,
320 	 /* ThinkPad X201s */
321 	 .matches = {
322 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
323 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
324 		},
325 	},
326 	{
327 	 .callback = video_detect_force_video,
328 	 /* ThinkPad X201T */
329 	 .matches = {
330 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
331 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
332 		},
333 	},
334 
335 	/* The native backlight controls do not work on some older machines */
336 	{
337 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
338 	 .callback = video_detect_force_video,
339 	 /* HP ENVY 15 Notebook */
340 	 .matches = {
341 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
342 		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
343 		},
344 	},
345 	{
346 	 .callback = video_detect_force_video,
347 	 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
348 	 .matches = {
349 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
350 		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
351 		},
352 	},
353 	{
354 	 .callback = video_detect_force_video,
355 	 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
356 	 .matches = {
357 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
358 		DMI_MATCH(DMI_PRODUCT_NAME,
359 			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
360 		},
361 	},
362 	{
363 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
364 	 .callback = video_detect_force_video,
365 	 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
366 	 .matches = {
367 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
368 		DMI_MATCH(DMI_PRODUCT_NAME,
369 			  "3570R/370R/470R/450R/510R/4450RV"),
370 		},
371 	},
372 	{
373 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
374 	 .callback = video_detect_force_video,
375 	 /* SAMSUNG 670Z5E */
376 	 .matches = {
377 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
378 		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
379 		},
380 	},
381 	{
382 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
383 	 .callback = video_detect_force_video,
384 	 /* SAMSUNG 730U3E/740U3E */
385 	 .matches = {
386 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
387 		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
388 		},
389 	},
390 	{
391 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
392 	 .callback = video_detect_force_video,
393 	 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
394 	 .matches = {
395 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
396 		DMI_MATCH(DMI_PRODUCT_NAME,
397 			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
398 		},
399 	},
400 	{
401 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
402 	 .callback = video_detect_force_video,
403 	 /* Dell XPS14 L421X */
404 	 .matches = {
405 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
406 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
407 		},
408 	},
409 	{
410 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
411 	 .callback = video_detect_force_video,
412 	 /* Dell XPS15 L521X */
413 	 .matches = {
414 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
415 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
416 		},
417 	},
418 	{
419 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
420 	 .callback = video_detect_force_video,
421 	 /* SAMSUNG 530U4E/540U4E */
422 	 .matches = {
423 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
424 		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
425 		},
426 	},
427 	{
428 	 /* https://bugs.launchpad.net/bugs/1894667 */
429 	 .callback = video_detect_force_video,
430 	 /* HP 635 Notebook */
431 	 .matches = {
432 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
433 		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
434 		},
435 	},
436 
437 	/* Non win8 machines which need native backlight nevertheless */
438 	{
439 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
440 	 .callback = video_detect_force_native,
441 	 /* Lenovo Ideapad S405 */
442 	 .matches = {
443 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
444 		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
445 		},
446 	},
447 	{
448 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
449 	 .callback = video_detect_force_native,
450 	 /* Lenovo Ideapad Z570 */
451 	 .matches = {
452 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
453 		DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
454 		},
455 	},
456 	{
457 	 .callback = video_detect_force_native,
458 	 /* Lenovo E41-25 */
459 	 .matches = {
460 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
461 		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
462 		},
463 	},
464 	{
465 	 .callback = video_detect_force_native,
466 	 /* Lenovo E41-45 */
467 	 .matches = {
468 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
469 		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
470 		},
471 	},
472 	{
473 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
474 	 .callback = video_detect_force_native,
475 	 /* Apple MacBook Pro 12,1 */
476 	 .matches = {
477 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
478 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
479 		},
480 	},
481 	{
482 	 .callback = video_detect_force_native,
483 	 /* Dell Inspiron N4010 */
484 	 .matches = {
485 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
486 		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
487 		},
488 	},
489 	{
490 	 .callback = video_detect_force_native,
491 	 /* Dell Vostro V131 */
492 	 .matches = {
493 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
494 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
495 		},
496 	},
497 	{
498 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
499 	 .callback = video_detect_force_native,
500 	 /* Dell XPS 17 L702X */
501 	 .matches = {
502 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
503 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
504 		},
505 	},
506 	{
507 	 .callback = video_detect_force_native,
508 	 /* Dell Precision 7510 */
509 	 .matches = {
510 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
511 		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
512 		},
513 	},
514 	{
515 	 .callback = video_detect_force_native,
516 	 /* Acer Aspire 5738z */
517 	 .matches = {
518 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
519 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
520 		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
521 		},
522 	},
523 	{
524 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
525 	 .callback = video_detect_force_native,
526 	 /* Acer Aspire 5741 */
527 	 .matches = {
528 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
529 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
530 		},
531 	},
532 	{
533 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
534 	 .callback = video_detect_force_native,
535 	 /* Acer Aspire 5750 */
536 	 .matches = {
537 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
538 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
539 		},
540 	},
541 	{
542 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
543 	 .callback = video_detect_force_native,
544 	 /* Acer Extensa 5235 */
545 	 .matches = {
546 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
547 		DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
548 		},
549 	},
550 	{
551 	 .callback = video_detect_force_native,
552 	 /* Acer TravelMate 4750 */
553 	 .matches = {
554 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
555 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
556 		},
557 	},
558 	{
559 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
560 	 .callback = video_detect_force_native,
561 	 /* Acer TravelMate 5735Z */
562 	 .matches = {
563 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
564 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
565 		DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
566 		},
567 	},
568 	{
569 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
570 	 .callback = video_detect_force_native,
571 	 /* Acer TravelMate 5760 */
572 	 .matches = {
573 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
574 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
575 		},
576 	},
577 	{
578 	 .callback = video_detect_force_native,
579 	 /* ASUSTeK COMPUTER INC. GA401 */
580 	 .matches = {
581 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
582 		DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
583 		},
584 	},
585 	{
586 	 .callback = video_detect_force_native,
587 	 /* ASUSTeK COMPUTER INC. GA502 */
588 	 .matches = {
589 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
590 		DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
591 		},
592 	},
593 	{
594 	 .callback = video_detect_force_native,
595 	 /* ASUSTeK COMPUTER INC. GA503 */
596 	 .matches = {
597 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
598 		DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
599 		},
600 	},
601 	{
602 	 .callback = video_detect_force_native,
603 	 /* Asus UX303UB */
604 	 .matches = {
605 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
606 		DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
607 		},
608 	},
609 	{
610 	 .callback = video_detect_force_native,
611 	 /* Samsung N150P */
612 	 .matches = {
613 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
614 		DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
615 		DMI_MATCH(DMI_BOARD_NAME, "N150P"),
616 		},
617 	},
618 	{
619 	 .callback = video_detect_force_native,
620 	 /* Samsung N145P/N250P/N260P */
621 	 .matches = {
622 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
623 		DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
624 		DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
625 		},
626 	},
627 	{
628 	 .callback = video_detect_force_native,
629 	 /* Samsung N250P */
630 	 .matches = {
631 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
632 		DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
633 		DMI_MATCH(DMI_BOARD_NAME, "N250P"),
634 		},
635 	},
636 	{
637 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
638 	 .callback = video_detect_force_native,
639 	 /* Sony Vaio VPCEH3U1E */
640 	 .matches = {
641 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
642 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
643 		},
644 	},
645 	{
646 	 .callback = video_detect_force_native,
647 	 /* Sony Vaio VPCY11S1E */
648 	 .matches = {
649 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
650 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
651 		},
652 	},
653 
654 	/*
655 	 * These Toshibas have a broken acpi-video interface for brightness
656 	 * control. They also have an issue where the panel is off after
657 	 * suspend until a special firmware call is made to turn it back
658 	 * on. This is handled by the toshiba_acpi kernel module, so that
659 	 * module must be enabled for these models to work correctly.
660 	 */
661 	{
662 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
663 	 .callback = video_detect_force_native,
664 	 /* Toshiba Portégé R700 */
665 	 .matches = {
666 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
667 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
668 		},
669 	},
670 	{
671 	 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
672 	 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
673 	 .callback = video_detect_force_native,
674 	 /* Toshiba Satellite/Portégé R830 */
675 	 .matches = {
676 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
677 		DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
678 		},
679 	},
680 	{
681 	 .callback = video_detect_force_native,
682 	 /* Toshiba Satellite/Portégé Z830 */
683 	 .matches = {
684 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
685 		DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
686 		},
687 	},
688 
689 	/*
690 	 * Models which have nvidia-ec-wmi support, but should not use it.
691 	 * Note this indicates a likely firmware bug on these models and should
692 	 * be revisited if/when Linux gets support for dynamic mux mode.
693 	 */
694 	{
695 	 .callback = video_detect_force_native,
696 	 /* Dell G15 5515 */
697 	 .matches = {
698 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
699 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
700 		},
701 	},
702 
703 	/*
704 	 * Desktops which falsely report a backlight and which our heuristics
705 	 * for this do not catch.
706 	 */
707 	{
708 	 .callback = video_detect_force_none,
709 	 /* Dell OptiPlex 9020M */
710 	 .matches = {
711 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
712 		DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
713 		},
714 	},
715 	{
716 	 .callback = video_detect_force_none,
717 	 /* GIGABYTE GB-BXBT-2807 */
718 	 .matches = {
719 		DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
720 		DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
721 		},
722 	},
723 	{
724 	 .callback = video_detect_force_none,
725 	 /* MSI MS-7721 */
726 	 .matches = {
727 		DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
728 		DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
729 		},
730 	},
731 	{ },
732 };
733 
734 static bool google_cros_ec_present(void)
735 {
736 	return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
737 }
738 
739 /*
740  * Windows 8 and newer no longer use the ACPI video interface, so it often
741  * does not work. So on win8+ systems prefer native brightness control.
742  * Chromebooks should always prefer native backlight control.
743  */
744 static bool prefer_native_over_acpi_video(void)
745 {
746 	return acpi_osi_is_win8() || google_cros_ec_present();
747 }
748 
749 /*
750  * Determine which type of backlight interface to use on this system,
751  * First check cmdline, then dmi quirks, then do autodetect.
752  */
753 static enum acpi_backlight_type __acpi_video_get_backlight_type(bool native)
754 {
755 	static DEFINE_MUTEX(init_mutex);
756 	static bool nvidia_wmi_ec_present;
757 	static bool native_available;
758 	static bool init_done;
759 	static long video_caps;
760 
761 	/* Parse cmdline, dmi and acpi only once */
762 	mutex_lock(&init_mutex);
763 	if (!init_done) {
764 		acpi_video_parse_cmdline();
765 		dmi_check_system(video_detect_dmi_table);
766 		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
767 				    ACPI_UINT32_MAX, find_video, NULL,
768 				    &video_caps, NULL);
769 		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
770 		init_done = true;
771 	}
772 	if (native)
773 		native_available = true;
774 	mutex_unlock(&init_mutex);
775 
776 	/*
777 	 * The below heuristics / detection steps are in order of descending
778 	 * presedence. The commandline takes presedence over anything else.
779 	 */
780 	if (acpi_backlight_cmdline != acpi_backlight_undef)
781 		return acpi_backlight_cmdline;
782 
783 	/* DMI quirks override any autodetection. */
784 	if (acpi_backlight_dmi != acpi_backlight_undef)
785 		return acpi_backlight_dmi;
786 
787 	/* Special cases such as nvidia_wmi_ec and apple gmux. */
788 	if (nvidia_wmi_ec_present)
789 		return acpi_backlight_nvidia_wmi_ec;
790 
791 	if (apple_gmux_backlight_present())
792 		return acpi_backlight_apple_gmux;
793 
794 	/* Use ACPI video if available, except when native should be preferred. */
795 	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
796 	     !(native_available && prefer_native_over_acpi_video()))
797 		return acpi_backlight_video;
798 
799 	/* Use native if available */
800 	if (native_available)
801 		return acpi_backlight_native;
802 
803 	/* No ACPI video/native (old hw), use vendor specific fw methods. */
804 	return acpi_backlight_vendor;
805 }
806 
807 enum acpi_backlight_type acpi_video_get_backlight_type(void)
808 {
809 	return __acpi_video_get_backlight_type(false);
810 }
811 EXPORT_SYMBOL(acpi_video_get_backlight_type);
812 
813 bool acpi_video_backlight_use_native(void)
814 {
815 	return __acpi_video_get_backlight_type(true) == acpi_backlight_native;
816 }
817 EXPORT_SYMBOL(acpi_video_backlight_use_native);
818