xref: /linux/drivers/acpi/video_detect.c (revision bde5d79d00255db609fe9d859eef8c7b6d38b137)
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("dell_uart", acpi_video_backlight_string))
58 		acpi_backlight_cmdline = acpi_backlight_dell_uart;
59 	if (!strcmp("none", acpi_video_backlight_string))
60 		acpi_backlight_cmdline = acpi_backlight_none;
61 }
62 
63 static acpi_status
64 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
65 {
66 	struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
67 	long *cap = context;
68 	struct pci_dev *dev;
69 
70 	static const struct acpi_device_id video_ids[] = {
71 		{ACPI_VIDEO_HID, 0},
72 		{"", 0},
73 	};
74 
75 	if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
76 		dev = acpi_get_pci_dev(handle);
77 		if (!dev)
78 			return AE_OK;
79 		pci_dev_put(dev);
80 		*cap |= acpi_is_video_device(handle);
81 	}
82 	return AE_OK;
83 }
84 
85 /* This depends on ACPI_WMI which is X86 only */
86 #ifdef CONFIG_X86
87 static bool nvidia_wmi_ec_supported(void)
88 {
89 	struct wmi_brightness_args args = {
90 		.mode = WMI_BRIGHTNESS_MODE_GET,
91 		.val = 0,
92 		.ret = 0,
93 	};
94 	struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
95 	acpi_status status;
96 
97 	status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
98 				     WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
99 	if (ACPI_FAILURE(status))
100 		return false;
101 
102 	/*
103 	 * If brightness is handled by the EC then nvidia-wmi-ec-backlight
104 	 * should be used, else the GPU driver(s) should be used.
105 	 */
106 	return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
107 }
108 #else
109 static bool nvidia_wmi_ec_supported(void)
110 {
111 	return false;
112 }
113 #endif
114 
115 /* Force to use vendor driver when the ACPI device is known to be
116  * buggy */
117 static int video_detect_force_vendor(const struct dmi_system_id *d)
118 {
119 	acpi_backlight_dmi = acpi_backlight_vendor;
120 	return 0;
121 }
122 
123 static int video_detect_force_video(const struct dmi_system_id *d)
124 {
125 	acpi_backlight_dmi = acpi_backlight_video;
126 	return 0;
127 }
128 
129 static int video_detect_force_native(const struct dmi_system_id *d)
130 {
131 	acpi_backlight_dmi = acpi_backlight_native;
132 	return 0;
133 }
134 
135 static int video_detect_portege_r100(const struct dmi_system_id *d)
136 {
137 	struct pci_dev *dev;
138 	/* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
139 	dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
140 	if (dev)
141 		acpi_backlight_dmi = acpi_backlight_vendor;
142 	return 0;
143 }
144 
145 static const struct dmi_system_id video_detect_dmi_table[] = {
146 	/*
147 	 * Models which should use the vendor backlight interface,
148 	 * because of broken ACPI video backlight control.
149 	 */
150 	{
151 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
152 	 .callback = video_detect_force_vendor,
153 	 /* Acer KAV80 */
154 	 .matches = {
155 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
156 		DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
157 		},
158 	},
159 	{
160 	 .callback = video_detect_force_vendor,
161 	 /* Asus UL30VT */
162 	 .matches = {
163 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
164 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
165 		},
166 	},
167 	{
168 	 .callback = video_detect_force_vendor,
169 	 /* Asus UL30A */
170 	 .matches = {
171 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
172 		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
173 		},
174 	},
175 	{
176 	 .callback = video_detect_force_vendor,
177 	 /* Asus X55U */
178 	 .matches = {
179 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
180 		DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
181 		},
182 	},
183 	{
184 	 /* https://bugs.launchpad.net/bugs/1000146 */
185 	 .callback = video_detect_force_vendor,
186 	 /* Asus X101CH */
187 	 .matches = {
188 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
189 		DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
190 		},
191 	},
192 	{
193 	 .callback = video_detect_force_vendor,
194 	 /* Asus X401U */
195 	 .matches = {
196 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
197 		DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
198 		},
199 	},
200 	{
201 	 .callback = video_detect_force_vendor,
202 	 /* Asus X501U */
203 	 .matches = {
204 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
205 		DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
206 		},
207 	},
208 	{
209 	 /* https://bugs.launchpad.net/bugs/1000146 */
210 	 .callback = video_detect_force_vendor,
211 	 /* Asus 1015CX */
212 	 .matches = {
213 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
214 		DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
215 		},
216 	},
217 	{
218 	 .callback = video_detect_force_vendor,
219 	 /* Samsung N150/N210/N220 */
220 	 .matches = {
221 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
222 		DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
223 		DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
224 		},
225 	},
226 	{
227 	 .callback = video_detect_force_vendor,
228 	 /* Samsung NF110/NF210/NF310 */
229 	 .matches = {
230 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
231 		DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
232 		DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
233 		},
234 	},
235 	{
236 	 .callback = video_detect_force_vendor,
237 	 /* Samsung NC210 */
238 	 .matches = {
239 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
240 		DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
241 		DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
242 		},
243 	},
244 
245 	/*
246 	 * Models which should use the vendor backlight interface,
247 	 * because of broken native backlight control.
248 	 */
249 	{
250 	 .callback = video_detect_force_vendor,
251 	 /* Sony Vaio PCG-FRV35 */
252 	 .matches = {
253 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
254 		DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
255 		},
256 	},
257 	{
258 	 .callback = video_detect_force_vendor,
259 	 /* Panasonic Toughbook CF-18 */
260 	 .matches = {
261 		DMI_MATCH(DMI_SYS_VENDOR, "Matsushita Electric Industrial"),
262 		DMI_MATCH(DMI_PRODUCT_NAME, "CF-18"),
263 		},
264 	},
265 
266 	/*
267 	 * Toshiba models with Transflective display, these need to use
268 	 * the toshiba_acpi vendor driver for proper Transflective handling.
269 	 */
270 	{
271 	 .callback = video_detect_force_vendor,
272 	 .matches = {
273 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
274 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
275 		},
276 	},
277 	{
278 	 .callback = video_detect_force_vendor,
279 	 .matches = {
280 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
281 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
282 		},
283 	},
284 
285 	/*
286 	 * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
287 	 * vendor driver. But none of them gets activated as it has a VGA with
288 	 * no kernel driver (Trident CyberBlade XP4m32).
289 	 * The DMI strings are generic so check for the VGA chip in callback.
290 	 */
291 	{
292 	 .callback = video_detect_portege_r100,
293 	 .matches = {
294 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
295 		DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
296 		DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
297 		DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
298 		},
299 	},
300 
301 	/*
302 	 * Models which need acpi_video backlight control where the GPU drivers
303 	 * do not call acpi_video_register_backlight() because no internal panel
304 	 * is detected. Typically these are all-in-ones (monitors with builtin
305 	 * PC) where the panel connection shows up as regular DP instead of eDP.
306 	 */
307 	{
308 	 .callback = video_detect_force_video,
309 	 /* Apple iMac14,1 */
310 	 .matches = {
311 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
312 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
313 		},
314 	},
315 	{
316 	 .callback = video_detect_force_video,
317 	 /* Apple iMac14,2 */
318 	 .matches = {
319 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
320 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
321 		},
322 	},
323 
324 	/*
325 	 * These models have a working acpi_video backlight control, and using
326 	 * native backlight causes a regression where backlight does not work
327 	 * when userspace is not handling brightness key events. Disable
328 	 * native_backlight on these to fix this:
329 	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
330 	 */
331 	{
332 	 .callback = video_detect_force_video,
333 	 /* ThinkPad T420 */
334 	 .matches = {
335 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
336 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
337 		},
338 	},
339 	{
340 	 .callback = video_detect_force_video,
341 	 /* ThinkPad T520 */
342 	 .matches = {
343 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
344 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
345 		},
346 	},
347 	{
348 	 .callback = video_detect_force_video,
349 	 /* ThinkPad X201s */
350 	 .matches = {
351 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
352 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
353 		},
354 	},
355 	{
356 	 .callback = video_detect_force_video,
357 	 /* ThinkPad X201T */
358 	 .matches = {
359 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
360 		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
361 		},
362 	},
363 
364 	/* The native backlight controls do not work on some older machines */
365 	{
366 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
367 	 .callback = video_detect_force_video,
368 	 /* HP ENVY 15 Notebook */
369 	 .matches = {
370 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
371 		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
372 		},
373 	},
374 	{
375 	 .callback = video_detect_force_video,
376 	 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
377 	 .matches = {
378 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
379 		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
380 		},
381 	},
382 	{
383 	 .callback = video_detect_force_video,
384 	 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
385 	 .matches = {
386 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
387 		DMI_MATCH(DMI_PRODUCT_NAME,
388 			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
389 		},
390 	},
391 	{
392 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
393 	 .callback = video_detect_force_video,
394 	 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
395 	 .matches = {
396 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
397 		DMI_MATCH(DMI_PRODUCT_NAME,
398 			  "3570R/370R/470R/450R/510R/4450RV"),
399 		},
400 	},
401 	{
402 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
403 	 .callback = video_detect_force_video,
404 	 /* SAMSUNG 670Z5E */
405 	 .matches = {
406 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
407 		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
408 		},
409 	},
410 	{
411 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
412 	 .callback = video_detect_force_video,
413 	 /* SAMSUNG 730U3E/740U3E */
414 	 .matches = {
415 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
416 		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
417 		},
418 	},
419 	{
420 	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
421 	 .callback = video_detect_force_video,
422 	 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
423 	 .matches = {
424 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
425 		DMI_MATCH(DMI_PRODUCT_NAME,
426 			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
427 		},
428 	},
429 	{
430 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
431 	 .callback = video_detect_force_video,
432 	 /* Dell XPS14 L421X */
433 	 .matches = {
434 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
435 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
436 		},
437 	},
438 	{
439 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
440 	 .callback = video_detect_force_video,
441 	 /* Dell XPS15 L521X */
442 	 .matches = {
443 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
444 		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
445 		},
446 	},
447 	{
448 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
449 	 .callback = video_detect_force_video,
450 	 /* SAMSUNG 530U4E/540U4E */
451 	 .matches = {
452 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
453 		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
454 		},
455 	},
456 	{
457 	 /* https://bugs.launchpad.net/bugs/1894667 */
458 	 .callback = video_detect_force_video,
459 	 /* HP 635 Notebook */
460 	 .matches = {
461 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
462 		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
463 		},
464 	},
465 
466 	/* Non win8 machines which need native backlight nevertheless */
467 	{
468 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
469 	 .callback = video_detect_force_native,
470 	 /* Lenovo Ideapad S405 */
471 	 .matches = {
472 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
473 		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
474 		},
475 	},
476 	{
477 	 /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
478 	 .callback = video_detect_force_native,
479 	 /* Lenovo Ideapad Z470 */
480 	 .matches = {
481 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
482 		DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
483 		},
484 	},
485 	{
486 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
487 	 .callback = video_detect_force_native,
488 	 /* Lenovo Ideapad Z570 */
489 	 .matches = {
490 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
491 		DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
492 		},
493 	},
494 	{
495 	 .callback = video_detect_force_native,
496 	 /* Lenovo E41-25 */
497 	 .matches = {
498 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
499 		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
500 		},
501 	},
502 	{
503 	 .callback = video_detect_force_native,
504 	 /* Lenovo E41-45 */
505 	 .matches = {
506 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
507 		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
508 		},
509 	},
510 	{
511 	 .callback = video_detect_force_native,
512 	 /* Lenovo Slim 7 16ARH7 */
513 	 .matches = {
514 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
515 		DMI_MATCH(DMI_PRODUCT_NAME, "82UX"),
516 		},
517 	},
518 	{
519 	 .callback = video_detect_force_native,
520 	 /* Lenovo ThinkPad X131e (3371 AMD version) */
521 	 .matches = {
522 		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
523 		DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
524 		},
525 	},
526 	{
527 	 .callback = video_detect_force_native,
528 	 /* Apple iMac11,3 */
529 	 .matches = {
530 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
531 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
532 		},
533 	},
534 	{
535 	 /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
536 	 .callback = video_detect_force_native,
537 	 /* Apple iMac12,1 */
538 	 .matches = {
539 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
540 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
541 		},
542 	},
543 	{
544 	 /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
545 	 .callback = video_detect_force_native,
546 	 /* Apple iMac12,2 */
547 	 .matches = {
548 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
549 		DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
550 		},
551 	},
552 	{
553 	 .callback = video_detect_force_native,
554 	 /* Apple MacBook Air 9,1 */
555 	 .matches = {
556 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
557 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir9,1"),
558 		},
559 	},
560 	{
561 	 .callback = video_detect_force_native,
562 	 /* Apple MacBook Pro 9,2 */
563 	 .matches = {
564 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
565 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,2"),
566 		},
567 	},
568 	{
569 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
570 	 .callback = video_detect_force_native,
571 	 /* Apple MacBook Pro 12,1 */
572 	 .matches = {
573 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
574 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
575 		},
576 	},
577 	{
578 	 .callback = video_detect_force_native,
579 	 /* Apple MacBook Pro 16,2 */
580 	 .matches = {
581 		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
582 		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,2"),
583 		},
584 	},
585 	{
586 	 .callback = video_detect_force_native,
587 	 /* Dell Inspiron N4010 */
588 	 .matches = {
589 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
590 		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
591 		},
592 	},
593 	{
594 	 .callback = video_detect_force_native,
595 	 /* Dell Vostro V131 */
596 	 .matches = {
597 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
598 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
599 		},
600 	},
601 	{
602 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
603 	 .callback = video_detect_force_native,
604 	 /* Dell XPS 17 L702X */
605 	 .matches = {
606 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
607 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
608 		},
609 	},
610 	{
611 	 .callback = video_detect_force_native,
612 	 /* Dell Precision 7510 */
613 	 .matches = {
614 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
615 		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
616 		},
617 	},
618 	{
619 	 .callback = video_detect_force_native,
620 	 /* Dell Studio 1569 */
621 	 .matches = {
622 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
623 		DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1569"),
624 		},
625 	},
626 	{
627 	 .callback = video_detect_force_native,
628 	 /* Acer Aspire 3830TG */
629 	 .matches = {
630 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
631 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
632 		},
633 	},
634 	{
635 	 .callback = video_detect_force_native,
636 	 /* Acer Aspire 4810T */
637 	 .matches = {
638 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
639 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
640 		},
641 	},
642 	{
643 	 .callback = video_detect_force_native,
644 	 /* Acer Aspire 5738z */
645 	 .matches = {
646 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
647 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
648 		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
649 		},
650 	},
651 	{
652 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
653 	 .callback = video_detect_force_native,
654 	 /* Acer Aspire 5741 */
655 	 .matches = {
656 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
657 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
658 		},
659 	},
660 	{
661 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
662 	 .callback = video_detect_force_native,
663 	 /* Acer Aspire 5750 */
664 	 .matches = {
665 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
666 		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
667 		},
668 	},
669 	{
670 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
671 	 .callback = video_detect_force_native,
672 	 /* Acer Extensa 5235 */
673 	 .matches = {
674 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
675 		DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
676 		},
677 	},
678 	{
679 	 .callback = video_detect_force_native,
680 	 /* Acer TravelMate 4750 */
681 	 .matches = {
682 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
683 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
684 		},
685 	},
686 	{
687 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
688 	 .callback = video_detect_force_native,
689 	 /* Acer TravelMate 5735Z */
690 	 .matches = {
691 		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
692 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
693 		DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
694 		},
695 	},
696 	{
697 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
698 	 .callback = video_detect_force_native,
699 	 /* Acer TravelMate 5760 */
700 	 .matches = {
701 		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
702 		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
703 		},
704 	},
705 	{
706 	 .callback = video_detect_force_native,
707 	 /* ASUSTeK COMPUTER INC. GA401 */
708 	 .matches = {
709 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
710 		DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
711 		},
712 	},
713 	{
714 	 .callback = video_detect_force_native,
715 	 /* ASUSTeK COMPUTER INC. GA502 */
716 	 .matches = {
717 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
718 		DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
719 		},
720 	},
721 	{
722 	 .callback = video_detect_force_native,
723 	 /* ASUSTeK COMPUTER INC. GA503 */
724 	 .matches = {
725 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
726 		DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
727 		},
728 	},
729 	{
730 	 .callback = video_detect_force_native,
731 	 /* Asus U46E */
732 	 .matches = {
733 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
734 		DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
735 		},
736 	},
737 	{
738 	 .callback = video_detect_force_native,
739 	 /* Asus UX303UB */
740 	 .matches = {
741 		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
742 		DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
743 		},
744 	},
745 	{
746 	 .callback = video_detect_force_native,
747 	 /* HP EliteBook 8460p */
748 	 .matches = {
749 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
750 		DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
751 		},
752 	},
753 	{
754 	 .callback = video_detect_force_native,
755 	 /* HP Pavilion g6-1d80nr / B4U19UA */
756 	 .matches = {
757 		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
758 		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
759 		DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
760 		},
761 	},
762 	{
763 	 .callback = video_detect_force_native,
764 	 /* Samsung N150P */
765 	 .matches = {
766 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
767 		DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
768 		DMI_MATCH(DMI_BOARD_NAME, "N150P"),
769 		},
770 	},
771 	{
772 	 .callback = video_detect_force_native,
773 	 /* Samsung N145P/N250P/N260P */
774 	 .matches = {
775 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
776 		DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
777 		DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
778 		},
779 	},
780 	{
781 	 .callback = video_detect_force_native,
782 	 /* Samsung N250P */
783 	 .matches = {
784 		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
785 		DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
786 		DMI_MATCH(DMI_BOARD_NAME, "N250P"),
787 		},
788 	},
789 	{
790 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
791 	 .callback = video_detect_force_native,
792 	 /* Sony Vaio VPCEH3U1E */
793 	 .matches = {
794 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
795 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
796 		},
797 	},
798 	{
799 	 .callback = video_detect_force_native,
800 	 /* Sony Vaio VPCY11S1E */
801 	 .matches = {
802 		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
803 		DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
804 		},
805 	},
806 
807 	/*
808 	 * These Toshibas have a broken acpi-video interface for brightness
809 	 * control. They also have an issue where the panel is off after
810 	 * suspend until a special firmware call is made to turn it back
811 	 * on. This is handled by the toshiba_acpi kernel module, so that
812 	 * module must be enabled for these models to work correctly.
813 	 */
814 	{
815 	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
816 	 .callback = video_detect_force_native,
817 	 /* Toshiba Portégé R700 */
818 	 .matches = {
819 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
820 		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
821 		},
822 	},
823 	{
824 	 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
825 	 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
826 	 .callback = video_detect_force_native,
827 	 /* Toshiba Satellite/Portégé R830 */
828 	 .matches = {
829 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
830 		DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
831 		},
832 	},
833 	{
834 	 .callback = video_detect_force_native,
835 	 /* Toshiba Satellite/Portégé Z830 */
836 	 .matches = {
837 		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
838 		DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
839 		},
840 	},
841 
842 	/*
843 	 * Dell AIO (All in Ones) which advertise an UART attached backlight
844 	 * controller board in their ACPI tables (and may even have one), but
845 	 * which need native backlight control nevertheless.
846 	 */
847 	{
848 	 /* https://bugzilla.redhat.com/show_bug.cgi?id=2303936 */
849 	 .callback = video_detect_force_native,
850 	 /* Dell OptiPlex 7760 AIO */
851 	 .matches = {
852 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
853 		DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7760 AIO"),
854 		},
855 	},
856 
857 	/*
858 	 * Models which have nvidia-ec-wmi support, but should not use it.
859 	 * Note this indicates a likely firmware bug on these models and should
860 	 * be revisited if/when Linux gets support for dynamic mux mode.
861 	 */
862 	{
863 	 .callback = video_detect_force_native,
864 	 /* Dell G15 5515 */
865 	 .matches = {
866 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
867 		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
868 		},
869 	},
870 	{
871 	 .callback = video_detect_force_native,
872 	 .matches = {
873 		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
874 		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
875 		},
876 	},
877 
878 	/*
879 	 * x86 android tablets which directly control the backlight through
880 	 * an external backlight controller, typically TI's LP8557.
881 	 * The backlight is directly controlled by the lp855x driver on these.
882 	 * This setup means that neither i915's native nor acpi_video backlight
883 	 * control works. Add a "vendor" quirk to disable both. Note these
884 	 * devices do not use vendor control in the typical meaning of
885 	 * vendor specific SMBIOS or ACPI calls being used.
886 	 */
887 	{
888 	 .callback = video_detect_force_vendor,
889 	 /* Lenovo Yoga Book X90F / X90L */
890 	 .matches = {
891 		DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
892 		DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
893 		DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
894 		},
895 	},
896 	{
897 	 .callback = video_detect_force_vendor,
898 	 /*
899 	  * Lenovo Yoga Tablet 2 830F/L or 1050F/L (The 8" and 10"
900 	  * Lenovo Yoga Tablet 2 use the same mainboard)
901 	  */
902 	 .matches = {
903 		DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
904 		DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
905 		DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
906 		/* Partial match on beginning of BIOS version */
907 		DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
908 		},
909 	},
910 	{
911 	 .callback = video_detect_force_vendor,
912 	 /* Lenovo Yoga Tab 3 Pro YT3-X90F */
913 	 .matches = {
914 		DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
915 		DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
916 		},
917 	},
918 	{
919 	 .callback = video_detect_force_vendor,
920 	 /* Xiaomi Mi Pad 2 */
921 	 .matches = {
922 		DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
923 		DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
924 		},
925 	},
926 	{ },
927 };
928 
929 static bool google_cros_ec_present(void)
930 {
931 	return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
932 }
933 
934 /*
935  * Windows 8 and newer no longer use the ACPI video interface, so it often
936  * does not work. So on win8+ systems prefer native brightness control.
937  * Chromebooks should always prefer native backlight control.
938  */
939 static bool prefer_native_over_acpi_video(void)
940 {
941 	return acpi_osi_is_win8() || google_cros_ec_present();
942 }
943 
944 /*
945  * Determine which type of backlight interface to use on this system,
946  * First check cmdline, then dmi quirks, then do autodetect.
947  */
948 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
949 {
950 	static DEFINE_MUTEX(init_mutex);
951 	static bool nvidia_wmi_ec_present;
952 	static bool apple_gmux_present;
953 	static bool dell_uart_present;
954 	static bool native_available;
955 	static bool init_done;
956 	static long video_caps;
957 
958 	/* Parse cmdline, dmi and acpi only once */
959 	mutex_lock(&init_mutex);
960 	if (!init_done) {
961 		acpi_video_parse_cmdline();
962 		dmi_check_system(video_detect_dmi_table);
963 		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
964 				    ACPI_UINT32_MAX, find_video, NULL,
965 				    &video_caps, NULL);
966 		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
967 		apple_gmux_present = apple_gmux_detect(NULL, NULL);
968 		dell_uart_present = acpi_dev_present("DELL0501", NULL, -1);
969 		init_done = true;
970 	}
971 	if (native)
972 		native_available = true;
973 	mutex_unlock(&init_mutex);
974 
975 	if (auto_detect)
976 		*auto_detect = false;
977 
978 	/*
979 	 * The below heuristics / detection steps are in order of descending
980 	 * presedence. The commandline takes presedence over anything else.
981 	 */
982 	if (acpi_backlight_cmdline != acpi_backlight_undef)
983 		return acpi_backlight_cmdline;
984 
985 	/* DMI quirks override any autodetection. */
986 	if (acpi_backlight_dmi != acpi_backlight_undef)
987 		return acpi_backlight_dmi;
988 
989 	if (auto_detect)
990 		*auto_detect = true;
991 
992 	/* Special cases such as nvidia_wmi_ec and apple gmux. */
993 	if (nvidia_wmi_ec_present)
994 		return acpi_backlight_nvidia_wmi_ec;
995 
996 	if (apple_gmux_present)
997 		return acpi_backlight_apple_gmux;
998 
999 	if (dell_uart_present)
1000 		return acpi_backlight_dell_uart;
1001 
1002 	/* Use ACPI video if available, except when native should be preferred. */
1003 	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
1004 	     !(native_available && prefer_native_over_acpi_video()))
1005 		return acpi_backlight_video;
1006 
1007 	/* Use native if available */
1008 	if (native_available)
1009 		return acpi_backlight_native;
1010 
1011 	/*
1012 	 * The vendor specific BIOS interfaces are only necessary for
1013 	 * laptops from before ~2008.
1014 	 *
1015 	 * For laptops from ~2008 till ~2023 this point is never reached
1016 	 * because on those (video_caps & ACPI_VIDEO_BACKLIGHT) above is true.
1017 	 *
1018 	 * Laptops from after ~2023 no longer support ACPI_VIDEO_BACKLIGHT,
1019 	 * if this point is reached on those, this likely means that
1020 	 * the GPU kms driver which sets native_available has not loaded yet.
1021 	 *
1022 	 * Returning acpi_backlight_vendor in this case is known to sometimes
1023 	 * cause a non working vendor specific /sys/class/backlight device to
1024 	 * get registered.
1025 	 *
1026 	 * Return acpi_backlight_none on laptops with ACPI tables written
1027 	 * for Windows 8 (laptops from after ~2012) to avoid this problem.
1028 	 */
1029 	if (acpi_osi_is_win8())
1030 		return acpi_backlight_none;
1031 
1032 	/* No ACPI video/native (old hw), use vendor specific fw methods. */
1033 	return acpi_backlight_vendor;
1034 }
1035 EXPORT_SYMBOL(__acpi_video_get_backlight_type);
1036