xref: /openbmc/linux/drivers/acpi/video_detect.c (revision 2f164822) 
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 int video_detect_force_none(const struct dmi_system_id *d)
134 {
135 	acpi_backlight_dmi = acpi_backlight_none;
136 	return 0;
137 }
138 
139 static const struct dmi_system_id video_detect_dmi_table[] = {
140 	/*
141 	 * Models which should use the vendor backlight interface,
142 	 * because of broken ACPI video backlight control.
143 	 */
144 	{
145 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
146 	 .callback = video_detect_force_vendor,
147 	 /* Acer KAV80 */
148 	 .matches = {
149 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
150 		DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
151 		},
152 	},
153 	{
154 	 .callback = video_detect_force_vendor,
155 	 /* Asus UL30VT */
156 	 .matches = {
157 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
158 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
159 		},
160 	},
161 	{
162 	 .callback = video_detect_force_vendor,
163 	 /* Asus UL30A */
164 	 .matches = {
165 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
166 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
167 		},
168 	},
169 	{
170 	 .callback = video_detect_force_vendor,
171 	 /* Asus X55U */
172 	 .matches = {
173 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
174 		DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
175 		},
176 	},
177 	{
178 	 /* https://bugs.launchpad.net/bugs/1000146 */
179 	 .callback = video_detect_force_vendor,
180 	 /* Asus X101CH */
181 	 .matches = {
182 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
183 		DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
184 		},
185 	},
186 	{
187 	 .callback = video_detect_force_vendor,
188 	 /* Asus X401U */
189 	 .matches = {
190 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
191 		DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
192 		},
193 	},
194 	{
195 	 .callback = video_detect_force_vendor,
196 	 /* Asus X501U */
197 	 .matches = {
198 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
199 		DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
200 		},
201 	},
202 	{
203 	 /* https://bugs.launchpad.net/bugs/1000146 */
204 	 .callback = video_detect_force_vendor,
205 	 /* Asus 1015CX */
206 	 .matches = {
207 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
208 		DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
209 		},
210 	},
211 	{
212 	 .callback = video_detect_force_vendor,
213 	 /* Samsung N150/N210/N220 */
214 	 .matches = {
215 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
216 		DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
217 		DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
218 		},
219 	},
220 	{
221 	 .callback = video_detect_force_vendor,
222 	 /* Samsung NF110/NF210/NF310 */
223 	 .matches = {
224 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
225 		DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
226 		DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
227 		},
228 	},
229 	{
230 	 .callback = video_detect_force_vendor,
231 	 /* Samsung NC210 */
232 	 .matches = {
233 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
234 		DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
235 		DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
236 		},
237 	},
238 	{
239 	 .callback = video_detect_force_vendor,
240 	 /* Xiaomi Mi Pad 2 */
241 	 .matches = {
242 			DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
243 			DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
244 		},
245 	},
246 
247 	/*
248 	 * Models which should use the vendor backlight interface,
249 	 * because of broken native backlight control.
250 	 */
251 	{
252 	 .callback = video_detect_force_vendor,
253 	 /* Sony Vaio PCG-FRV35 */
254 	 .matches = {
255 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
256 		DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
257 		},
258 	},
259 
260 	/*
261 	 * Toshiba models with Transflective display, these need to use
262 	 * the toshiba_acpi vendor driver for proper Transflective handling.
263 	 */
264 	{
265 	 .callback = video_detect_force_vendor,
266 	 .matches = {
267 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
268 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
269 		},
270 	},
271 	{
272 	 .callback = video_detect_force_vendor,
273 	 .matches = {
274 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
275 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
276 		},
277 	},
278 
279 	/*
280 	 * Models which need acpi_video backlight control where the GPU drivers
281 	 * do not call acpi_video_register_backlight() because no internal panel
282 	 * is detected. Typically these are all-in-ones (monitors with builtin
283 	 * PC) where the panel connection shows up as regular DP instead of eDP.
284 	 */
285 	{
286 	 .callback = video_detect_force_video,
287 	 /* Apple iMac14,1 */
288 	 .matches = {
289 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
290 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
291 		},
292 	},
293 	{
294 	 .callback = video_detect_force_video,
295 	 /* Apple iMac14,2 */
296 	 .matches = {
297 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
298 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
299 		},
300 	},
301 
302 	/*
303 	 * Older models with nvidia GPU which need acpi_video backlight
304 	 * control and where the old nvidia binary driver series does not
305 	 * call acpi_video_register_backlight().
306 	 */
307 	{
308 	 .callback = video_detect_force_video,
309 	 /* ThinkPad W530 */
310 	 .matches = {
311 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
312 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
313 		},
314 	},
315 
316 	/*
317 	 * These models have a working acpi_video backlight control, and using
318 	 * native backlight causes a regression where backlight does not work
319 	 * when userspace is not handling brightness key events. Disable
320 	 * native_backlight on these to fix this:
321 	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
322 	 */
323 	{
324 	 .callback = video_detect_force_video,
325 	 /* ThinkPad T420 */
326 	 .matches = {
327 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
328 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
329 		},
330 	},
331 	{
332 	 .callback = video_detect_force_video,
333 	 /* ThinkPad T520 */
334 	 .matches = {
335 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
336 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
337 		},
338 	},
339 	{
340 	 .callback = video_detect_force_video,
341 	 /* ThinkPad X201s */
342 	 .matches = {
343 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
344 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
345 		},
346 	},
347 	{
348 	 .callback = video_detect_force_video,
349 	 /* ThinkPad X201T */
350 	 .matches = {
351 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
352 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
353 		},
354 	},
355 
356 	/* The native backlight controls do not work on some older machines */
357 	{
358 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
359 	 .callback = video_detect_force_video,
360 	 /* HP ENVY 15 Notebook */
361 	 .matches = {
362 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
363 		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
364 		},
365 	},
366 	{
367 	 .callback = video_detect_force_video,
368 	 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
369 	 .matches = {
370 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
371 		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
372 		},
373 	},
374 	{
375 	 .callback = video_detect_force_video,
376 	 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
377 	 .matches = {
378 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
379 		DMI_MATCH(DMI_PRODUCT_NAME,
380 			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
381 		},
382 	},
383 	{
384 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
385 	 .callback = video_detect_force_video,
386 	 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
387 	 .matches = {
388 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
389 		DMI_MATCH(DMI_PRODUCT_NAME,
390 			  "3570R/370R/470R/450R/510R/4450RV"),
391 		},
392 	},
393 	{
394 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
395 	 .callback = video_detect_force_video,
396 	 /* SAMSUNG 670Z5E */
397 	 .matches = {
398 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
399 		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
400 		},
401 	},
402 	{
403 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
404 	 .callback = video_detect_force_video,
405 	 /* SAMSUNG 730U3E/740U3E */
406 	 .matches = {
407 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
408 		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
409 		},
410 	},
411 	{
412 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
413 	 .callback = video_detect_force_video,
414 	 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
415 	 .matches = {
416 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
417 		DMI_MATCH(DMI_PRODUCT_NAME,
418 			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
419 		},
420 	},
421 	{
422 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
423 	 .callback = video_detect_force_video,
424 	 /* Dell XPS14 L421X */
425 	 .matches = {
426 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
427 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
428 		},
429 	},
430 	{
431 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
432 	 .callback = video_detect_force_video,
433 	 /* Dell XPS15 L521X */
434 	 .matches = {
435 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
436 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
437 		},
438 	},
439 	{
440 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
441 	 .callback = video_detect_force_video,
442 	 /* SAMSUNG 530U4E/540U4E */
443 	 .matches = {
444 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
445 		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
446 		},
447 	},
448 	{
449 	 /* https://bugs.launchpad.net/bugs/1894667 */
450 	 .callback = video_detect_force_video,
451 	 /* HP 635 Notebook */
452 	 .matches = {
453 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
454 		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
455 		},
456 	},
457 
458 	/* Non win8 machines which need native backlight nevertheless */
459 	{
460 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
461 	 .callback = video_detect_force_native,
462 	 /* Lenovo Ideapad S405 */
463 	 .matches = {
464 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
465 		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
466 		},
467 	},
468 	{
469 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
470 	 .callback = video_detect_force_native,
471 	 /* Lenovo Ideapad Z570 */
472 	 .matches = {
473 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
474 		DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
475 		},
476 	},
477 	{
478 	 .callback = video_detect_force_native,
479 	 /* Lenovo E41-25 */
480 	 .matches = {
481 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
482 		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
483 		},
484 	},
485 	{
486 	 .callback = video_detect_force_native,
487 	 /* Lenovo E41-45 */
488 	 .matches = {
489 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
490 		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
491 		},
492 	},
493 	{
494 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
495 	 .callback = video_detect_force_native,
496 	 /* Apple MacBook Pro 12,1 */
497 	 .matches = {
498 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
499 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
500 		},
501 	},
502 	{
503 	 .callback = video_detect_force_native,
504 	 /* Dell Inspiron N4010 */
505 	 .matches = {
506 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
507 		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
508 		},
509 	},
510 	{
511 	 .callback = video_detect_force_native,
512 	 /* Dell Vostro V131 */
513 	 .matches = {
514 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
515 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
516 		},
517 	},
518 	{
519 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
520 	 .callback = video_detect_force_native,
521 	 /* Dell XPS 17 L702X */
522 	 .matches = {
523 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
524 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
525 		},
526 	},
527 	{
528 	 .callback = video_detect_force_native,
529 	 /* Dell Precision 7510 */
530 	 .matches = {
531 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
532 		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
533 		},
534 	},
535 	{
536 	 .callback = video_detect_force_native,
537 	 /* Acer Aspire 3830TG */
538 	 .matches = {
539 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
540 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
541 		},
542 	},
543 	{
544 	 .callback = video_detect_force_native,
545 	 /* Acer Aspire 4810T */
546 	 .matches = {
547 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
548 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
549 		},
550 	},
551 	{
552 	 .callback = video_detect_force_native,
553 	 /* Acer Aspire 5738z */
554 	 .matches = {
555 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
556 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
557 		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
558 		},
559 	},
560 	{
561 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
562 	 .callback = video_detect_force_native,
563 	 /* Acer Aspire 5741 */
564 	 .matches = {
565 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
566 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
567 		},
568 	},
569 	{
570 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
571 	 .callback = video_detect_force_native,
572 	 /* Acer Aspire 5750 */
573 	 .matches = {
574 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
575 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
576 		},
577 	},
578 	{
579 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
580 	 .callback = video_detect_force_native,
581 	 /* Acer Extensa 5235 */
582 	 .matches = {
583 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
584 		DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
585 		},
586 	},
587 	{
588 	 .callback = video_detect_force_native,
589 	 /* Acer TravelMate 4750 */
590 	 .matches = {
591 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
592 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
593 		},
594 	},
595 	{
596 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
597 	 .callback = video_detect_force_native,
598 	 /* Acer TravelMate 5735Z */
599 	 .matches = {
600 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
601 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
602 		DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
603 		},
604 	},
605 	{
606 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
607 	 .callback = video_detect_force_native,
608 	 /* Acer TravelMate 5760 */
609 	 .matches = {
610 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
611 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
612 		},
613 	},
614 	{
615 	 .callback = video_detect_force_native,
616 	 /* ASUSTeK COMPUTER INC. GA401 */
617 	 .matches = {
618 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
619 		DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
620 		},
621 	},
622 	{
623 	 .callback = video_detect_force_native,
624 	 /* ASUSTeK COMPUTER INC. GA502 */
625 	 .matches = {
626 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
627 		DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
628 		},
629 	},
630 	{
631 	 .callback = video_detect_force_native,
632 	 /* ASUSTeK COMPUTER INC. GA503 */
633 	 .matches = {
634 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
635 		DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
636 		},
637 	},
638 	{
639 	 .callback = video_detect_force_native,
640 	 /* Asus U46E */
641 	 .matches = {
642 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
643 		DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
644 		},
645 	},
646 	{
647 	 .callback = video_detect_force_native,
648 	 /* Asus UX303UB */
649 	 .matches = {
650 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
651 		DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
652 		},
653 	},
654 	{
655 	 .callback = video_detect_force_native,
656 	 /* HP EliteBook 8460p */
657 	 .matches = {
658 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
659 		DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
660 		},
661 	},
662 	{
663 	 .callback = video_detect_force_native,
664 	 /* HP Pavilion g6-1d80nr / B4U19UA */
665 	 .matches = {
666 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
667 		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
668 		DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
669 		},
670 	},
671 	{
672 	 .callback = video_detect_force_native,
673 	 /* Samsung N150P */
674 	 .matches = {
675 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
676 		DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
677 		DMI_MATCH(DMI_BOARD_NAME, "N150P"),
678 		},
679 	},
680 	{
681 	 .callback = video_detect_force_native,
682 	 /* Samsung N145P/N250P/N260P */
683 	 .matches = {
684 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
685 		DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
686 		DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
687 		},
688 	},
689 	{
690 	 .callback = video_detect_force_native,
691 	 /* Samsung N250P */
692 	 .matches = {
693 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
694 		DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
695 		DMI_MATCH(DMI_BOARD_NAME, "N250P"),
696 		},
697 	},
698 	{
699 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
700 	 .callback = video_detect_force_native,
701 	 /* Sony Vaio VPCEH3U1E */
702 	 .matches = {
703 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
704 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
705 		},
706 	},
707 	{
708 	 .callback = video_detect_force_native,
709 	 /* Sony Vaio VPCY11S1E */
710 	 .matches = {
711 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
712 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
713 		},
714 	},
715 
716 	/*
717 	 * These Toshibas have a broken acpi-video interface for brightness
718 	 * control. They also have an issue where the panel is off after
719 	 * suspend until a special firmware call is made to turn it back
720 	 * on. This is handled by the toshiba_acpi kernel module, so that
721 	 * module must be enabled for these models to work correctly.
722 	 */
723 	{
724 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
725 	 .callback = video_detect_force_native,
726 	 /* Toshiba Portégé R700 */
727 	 .matches = {
728 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
729 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
730 		},
731 	},
732 	{
733 	 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
734 	 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
735 	 .callback = video_detect_force_native,
736 	 /* Toshiba Satellite/Portégé R830 */
737 	 .matches = {
738 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
739 		DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
740 		},
741 	},
742 	{
743 	 .callback = video_detect_force_native,
744 	 /* Toshiba Satellite/Portégé Z830 */
745 	 .matches = {
746 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
747 		DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
748 		},
749 	},
750 
751 	/*
752 	 * Models which have nvidia-ec-wmi support, but should not use it.
753 	 * Note this indicates a likely firmware bug on these models and should
754 	 * be revisited if/when Linux gets support for dynamic mux mode.
755 	 */
756 	{
757 	 .callback = video_detect_force_native,
758 	 /* Dell G15 5515 */
759 	 .matches = {
760 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
761 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
762 		},
763 	},
764 	{
765 	 .callback = video_detect_force_native,
766 	 .matches = {
767 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
768 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
769 		},
770 	},
771 
772 	/*
773 	 * Desktops which falsely report a backlight and which our heuristics
774 	 * for this do not catch.
775 	 */
776 	{
777 	 .callback = video_detect_force_none,
778 	 /* Dell OptiPlex 9020M */
779 	 .matches = {
780 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
781 		DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
782 		},
783 	},
784 	{
785 	 .callback = video_detect_force_none,
786 	 /* GIGABYTE GB-BXBT-2807 */
787 	 .matches = {
788 		DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
789 		DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
790 		},
791 	},
792 	{
793 	 .callback = video_detect_force_none,
794 	 /* MSI MS-7721 */
795 	 .matches = {
796 		DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
797 		DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
798 		},
799 	},
800 	{ },
801 };
802 
803 static bool google_cros_ec_present(void)
804 {
805 	return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
806 }
807 
808 /*
809  * Windows 8 and newer no longer use the ACPI video interface, so it often
810  * does not work. So on win8+ systems prefer native brightness control.
811  * Chromebooks should always prefer native backlight control.
812  */
813 static bool prefer_native_over_acpi_video(void)
814 {
815 	return acpi_osi_is_win8() || google_cros_ec_present();
816 }
817 
818 /*
819  * Determine which type of backlight interface to use on this system,
820  * First check cmdline, then dmi quirks, then do autodetect.
821  */
822 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
823 {
824 	static DEFINE_MUTEX(init_mutex);
825 	static bool nvidia_wmi_ec_present;
826 	static bool apple_gmux_present;
827 	static bool native_available;
828 	static bool init_done;
829 	static long video_caps;
830 
831 	/* Parse cmdline, dmi and acpi only once */
832 	mutex_lock(&init_mutex);
833 	if (!init_done) {
834 		acpi_video_parse_cmdline();
835 		dmi_check_system(video_detect_dmi_table);
836 		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
837 				    ACPI_UINT32_MAX, find_video, NULL,
838 				    &video_caps, NULL);
839 		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
840 		apple_gmux_present = apple_gmux_detect(NULL, NULL);
841 		init_done = true;
842 	}
843 	if (native)
844 		native_available = true;
845 	mutex_unlock(&init_mutex);
846 
847 	if (auto_detect)
848 		*auto_detect = false;
849 
850 	/*
851 	 * The below heuristics / detection steps are in order of descending
852 	 * presedence. The commandline takes presedence over anything else.
853 	 */
854 	if (acpi_backlight_cmdline != acpi_backlight_undef)
855 		return acpi_backlight_cmdline;
856 
857 	/* DMI quirks override any autodetection. */
858 	if (acpi_backlight_dmi != acpi_backlight_undef)
859 		return acpi_backlight_dmi;
860 
861 	if (auto_detect)
862 		*auto_detect = true;
863 
864 	/* Special cases such as nvidia_wmi_ec and apple gmux. */
865 	if (nvidia_wmi_ec_present)
866 		return acpi_backlight_nvidia_wmi_ec;
867 
868 	if (apple_gmux_present)
869 		return acpi_backlight_apple_gmux;
870 
871 	/* Use ACPI video if available, except when native should be preferred. */
872 	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
873 	     !(native_available && prefer_native_over_acpi_video()))
874 		return acpi_backlight_video;
875 
876 	/* Use native if available */
877 	if (native_available)
878 		return acpi_backlight_native;
879 
880 	/* No ACPI video/native (old hw), use vendor specific fw methods. */
881 	return acpi_backlight_vendor;
882 }
883 EXPORT_SYMBOL(__acpi_video_get_backlight_type);
884