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
 42static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
 43static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
 44
 45static 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
 61static acpi_status
 62find_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
 85static 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
107static 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 */
115static int video_detect_force_vendor(const struct dmi_system_id *d)
116{
117	acpi_backlight_dmi = acpi_backlight_vendor;
118	return 0;
119}
120
121static int video_detect_force_video(const struct dmi_system_id *d)
122{
123	acpi_backlight_dmi = acpi_backlight_video;
124	return 0;
125}
126
127static int video_detect_force_native(const struct dmi_system_id *d)
128{
129	acpi_backlight_dmi = acpi_backlight_native;
130	return 0;
131}
132
133static int video_detect_portege_r100(const struct dmi_system_id *d)
134{
135	struct pci_dev *dev;
136	/* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
137	dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
138	if (dev)
139		acpi_backlight_dmi = acpi_backlight_vendor;
140	return 0;
141}
142
143static const struct dmi_system_id video_detect_dmi_table[] = {
144	/*
145	 * Models which should use the vendor backlight interface,
146	 * because of broken ACPI video backlight control.
147	 */
148	{
149	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
150	 .callback = video_detect_force_vendor,
151	 /* Acer KAV80 */
152	 .matches = {
153		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
154		DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
155		},
156	},
157	{
158	 .callback = video_detect_force_vendor,
159	 /* Asus UL30VT */
160	 .matches = {
161		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
162		DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
163		},
164	},
165	{
166	 .callback = video_detect_force_vendor,
167	 /* Asus UL30A */
168	 .matches = {
169		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
170		DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
171		},
172	},
173	{
174	 .callback = video_detect_force_vendor,
175	 /* Asus X55U */
176	 .matches = {
177		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
178		DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
179		},
180	},
181	{
182	 /* https://bugs.launchpad.net/bugs/1000146 */
183	 .callback = video_detect_force_vendor,
184	 /* Asus X101CH */
185	 .matches = {
186		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
187		DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
188		},
189	},
190	{
191	 .callback = video_detect_force_vendor,
192	 /* Asus X401U */
193	 .matches = {
194		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
195		DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
196		},
197	},
198	{
199	 .callback = video_detect_force_vendor,
200	 /* Asus X501U */
201	 .matches = {
202		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
203		DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
204		},
205	},
206	{
207	 /* https://bugs.launchpad.net/bugs/1000146 */
208	 .callback = video_detect_force_vendor,
209	 /* Asus 1015CX */
210	 .matches = {
211		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
212		DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
213		},
214	},
215	{
216	 .callback = video_detect_force_vendor,
217	 /* Samsung N150/N210/N220 */
218	 .matches = {
219		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
220		DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
221		DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
222		},
223	},
224	{
225	 .callback = video_detect_force_vendor,
226	 /* Samsung NF110/NF210/NF310 */
227	 .matches = {
228		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
229		DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
230		DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
231		},
232	},
233	{
234	 .callback = video_detect_force_vendor,
235	 /* Samsung NC210 */
236	 .matches = {
237		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
238		DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
239		DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
240		},
241	},
 
 
 
 
 
 
 
 
242
243	/*
244	 * Models which should use the vendor backlight interface,
245	 * because of broken native backlight control.
246	 */
247	{
248	 .callback = video_detect_force_vendor,
249	 /* Sony Vaio PCG-FRV35 */
250	 .matches = {
251		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
252		DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
253		},
254	},
255
256	/*
257	 * Toshiba models with Transflective display, these need to use
258	 * the toshiba_acpi vendor driver for proper Transflective handling.
259	 */
260	{
261	 .callback = video_detect_force_vendor,
262	 .matches = {
263		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
264		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
265		},
266	},
267	{
268	 .callback = video_detect_force_vendor,
269	 .matches = {
270		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
271		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
272		},
273	},
274
275	/*
276	 * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
277	 * vendor driver. But none of them gets activated as it has a VGA with
278	 * no kernel driver (Trident CyberBlade XP4m32).
279	 * The DMI strings are generic so check for the VGA chip in callback.
280	 */
281	{
282	 .callback = video_detect_portege_r100,
283	 .matches = {
284		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
285		DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
286		DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
287		DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
288		},
289	},
290
291	/*
292	 * Models which need acpi_video backlight control where the GPU drivers
293	 * do not call acpi_video_register_backlight() because no internal panel
294	 * is detected. Typically these are all-in-ones (monitors with builtin
295	 * PC) where the panel connection shows up as regular DP instead of eDP.
296	 */
297	{
298	 .callback = video_detect_force_video,
299	 /* Apple iMac14,1 */
300	 .matches = {
301		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
302		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
303		},
304	},
305	{
306	 .callback = video_detect_force_video,
307	 /* Apple iMac14,2 */
308	 .matches = {
309		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
310		DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
311		},
312	},
313
314	/*
315	 * These models have a working acpi_video backlight control, and using
316	 * native backlight causes a regression where backlight does not work
317	 * when userspace is not handling brightness key events. Disable
318	 * native_backlight on these to fix this:
319	 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
320	 */
321	{
322	 .callback = video_detect_force_video,
323	 /* ThinkPad T420 */
324	 .matches = {
325		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
326		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
327		},
328	},
329	{
330	 .callback = video_detect_force_video,
331	 /* ThinkPad T520 */
332	 .matches = {
333		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
334		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
335		},
336	},
337	{
338	 .callback = video_detect_force_video,
339	 /* ThinkPad X201s */
340	 .matches = {
341		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
342		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
343		},
344	},
345	{
346	 .callback = video_detect_force_video,
347	 /* ThinkPad X201T */
348	 .matches = {
349		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
350		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
351		},
352	},
353
354	/* The native backlight controls do not work on some older machines */
355	{
356	 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
357	 .callback = video_detect_force_video,
358	 /* HP ENVY 15 Notebook */
359	 .matches = {
360		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
361		DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
362		},
363	},
364	{
365	 .callback = video_detect_force_video,
366	 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
367	 .matches = {
368		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
369		DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
370		},
371	},
372	{
373	 .callback = video_detect_force_video,
374	 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
375	 .matches = {
376		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
377		DMI_MATCH(DMI_PRODUCT_NAME,
378			  "370R4E/370R4V/370R5E/3570RE/370R5V"),
379		},
380	},
381	{
382	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
383	 .callback = video_detect_force_video,
384	 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
385	 .matches = {
386		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
387		DMI_MATCH(DMI_PRODUCT_NAME,
388			  "3570R/370R/470R/450R/510R/4450RV"),
389		},
390	},
391	{
392	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
393	 .callback = video_detect_force_video,
394	 /* SAMSUNG 670Z5E */
395	 .matches = {
396		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
397		DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
398		},
399	},
400	{
401	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
402	 .callback = video_detect_force_video,
403	 /* SAMSUNG 730U3E/740U3E */
404	 .matches = {
405		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
406		DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
407		},
408	},
409	{
410	 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
411	 .callback = video_detect_force_video,
412	 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
413	 .matches = {
414		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
415		DMI_MATCH(DMI_PRODUCT_NAME,
416			  "900X3C/900X3D/900X3E/900X4C/900X4D"),
417		},
418	},
419	{
420	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
421	 .callback = video_detect_force_video,
422	 /* Dell XPS14 L421X */
423	 .matches = {
424		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
425		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
426		},
427	},
428	{
429	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
430	 .callback = video_detect_force_video,
431	 /* Dell XPS15 L521X */
432	 .matches = {
433		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
434		DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
435		},
436	},
437	{
438	 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
439	 .callback = video_detect_force_video,
440	 /* SAMSUNG 530U4E/540U4E */
441	 .matches = {
442		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
443		DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
444		},
445	},
446	{
447	 /* https://bugs.launchpad.net/bugs/1894667 */
448	 .callback = video_detect_force_video,
449	 /* HP 635 Notebook */
450	 .matches = {
451		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
452		DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
453		},
454	},
455
456	/* Non win8 machines which need native backlight nevertheless */
457	{
458	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
459	 .callback = video_detect_force_native,
460	 /* Lenovo Ideapad S405 */
461	 .matches = {
462		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
463		DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
464		},
465	},
466	{
467	 /* https://bugzilla.suse.com/show_bug.cgi?id=1208724 */
468	 .callback = video_detect_force_native,
469	 /* Lenovo Ideapad Z470 */
470	 .matches = {
471		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
472		DMI_MATCH(DMI_PRODUCT_VERSION, "IdeaPad Z470"),
473		},
474	},
475	{
476	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
477	 .callback = video_detect_force_native,
478	 /* Lenovo Ideapad Z570 */
479	 .matches = {
480		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
481		DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
482		},
483	},
484	{
485	 .callback = video_detect_force_native,
486	 /* Lenovo E41-25 */
487	 .matches = {
488		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
489		DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
490		},
491	},
492	{
493	 .callback = video_detect_force_native,
494	 /* Lenovo E41-45 */
495	 .matches = {
496		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
497		DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
498		},
499	},
500	{
501	 .callback = video_detect_force_native,
502	 /* Lenovo ThinkPad X131e (3371 AMD version) */
503	 .matches = {
504		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
505		DMI_MATCH(DMI_PRODUCT_NAME, "3371"),
506		},
507	},
508	{
509	 .callback = video_detect_force_native,
510	 /* Apple iMac11,3 */
511	 .matches = {
512		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
513		DMI_MATCH(DMI_PRODUCT_NAME, "iMac11,3"),
514		},
515	},
516	{
517	 /* https://gitlab.freedesktop.org/drm/amd/-/issues/1838 */
518	 .callback = video_detect_force_native,
519	 /* Apple iMac12,1 */
520	 .matches = {
521		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
522		DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,1"),
523		},
524	},
525	{
526	 /* https://gitlab.freedesktop.org/drm/amd/-/issues/2753 */
527	 .callback = video_detect_force_native,
528	 /* Apple iMac12,2 */
529	 .matches = {
530		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
531		DMI_MATCH(DMI_PRODUCT_NAME, "iMac12,2"),
532		},
533	},
534	{
535	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
536	 .callback = video_detect_force_native,
537	 /* Apple MacBook Pro 12,1 */
538	 .matches = {
539		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
540		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
541		},
542	},
543	{
544	 .callback = video_detect_force_native,
545	 /* Dell Inspiron N4010 */
546	 .matches = {
547		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
548		DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
549		},
550	},
551	{
552	 .callback = video_detect_force_native,
553	 /* Dell Vostro V131 */
554	 .matches = {
555		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
556		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
557		},
558	},
559	{
560	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
561	 .callback = video_detect_force_native,
562	 /* Dell XPS 17 L702X */
563	 .matches = {
564		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
565		DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
566		},
567	},
568	{
569	 .callback = video_detect_force_native,
570	 /* Dell Precision 7510 */
571	 .matches = {
572		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
573		DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
574		},
575	},
576	{
577	 .callback = video_detect_force_native,
578	 /* Dell Studio 1569 */
579	 .matches = {
580		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
581		DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1569"),
582		},
583	},
584	{
585	 .callback = video_detect_force_native,
586	 /* Acer Aspire 3830TG */
587	 .matches = {
588		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
589		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
590		},
591	},
592	{
593	 .callback = video_detect_force_native,
594	 /* Acer Aspire 4810T */
595	 .matches = {
596		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
597		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
598		},
599	},
600	{
601	 .callback = video_detect_force_native,
602	 /* Acer Aspire 5738z */
603	 .matches = {
604		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
605		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
606		DMI_MATCH(DMI_BOARD_NAME, "JV50"),
607		},
608	},
609	{
610	 /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
611	 .callback = video_detect_force_native,
612	 /* Acer Aspire 5741 */
613	 .matches = {
614		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
615		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
616		},
617	},
618	{
619	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
620	 .callback = video_detect_force_native,
621	 /* Acer Aspire 5750 */
622	 .matches = {
623		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
624		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
625		},
626	},
627	{
628	 /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
629	 .callback = video_detect_force_native,
630	 /* Acer Extensa 5235 */
631	 .matches = {
632		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
633		DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
634		},
635	},
636	{
637	 .callback = video_detect_force_native,
638	 /* Acer TravelMate 4750 */
639	 .matches = {
640		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
641		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
642		},
643	},
644	{
645	 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
646	 .callback = video_detect_force_native,
647	 /* Acer TravelMate 5735Z */
648	 .matches = {
649		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
650		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
651		DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
652		},
653	},
654	{
655	 /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
656	 .callback = video_detect_force_native,
657	 /* Acer TravelMate 5760 */
658	 .matches = {
659		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
660		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
661		},
662	},
663	{
664	 .callback = video_detect_force_native,
665	 /* ASUSTeK COMPUTER INC. GA401 */
666	 .matches = {
667		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
668		DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
669		},
670	},
671	{
672	 .callback = video_detect_force_native,
673	 /* ASUSTeK COMPUTER INC. GA502 */
674	 .matches = {
675		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
676		DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
677		},
678	},
679	{
680	 .callback = video_detect_force_native,
681	 /* ASUSTeK COMPUTER INC. GA503 */
682	 .matches = {
683		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
684		DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
685		},
686	},
687	{
688	 .callback = video_detect_force_native,
689	 /* Asus U46E */
690	 .matches = {
691		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
692		DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
693		},
694	},
695	{
696	 .callback = video_detect_force_native,
697	 /* Asus UX303UB */
698	 .matches = {
699		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
700		DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
701		},
702	},
703	{
704	 .callback = video_detect_force_native,
705	 /* HP EliteBook 8460p */
706	 .matches = {
707		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
708		DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
709		},
710	},
711	{
712	 .callback = video_detect_force_native,
713	 /* HP Pavilion g6-1d80nr / B4U19UA */
714	 .matches = {
715		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
716		DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
717		DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
718		},
719	},
720	{
721	 .callback = video_detect_force_native,
722	 /* Samsung N150P */
723	 .matches = {
724		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
725		DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
726		DMI_MATCH(DMI_BOARD_NAME, "N150P"),
727		},
728	},
729	{
730	 .callback = video_detect_force_native,
731	 /* Samsung N145P/N250P/N260P */
732	 .matches = {
733		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
734		DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
735		DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
736		},
737	},
738	{
739	 .callback = video_detect_force_native,
740	 /* Samsung N250P */
741	 .matches = {
742		DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
743		DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
744		DMI_MATCH(DMI_BOARD_NAME, "N250P"),
745		},
746	},
747	{
748	 /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
749	 .callback = video_detect_force_native,
750	 /* Sony Vaio VPCEH3U1E */
751	 .matches = {
752		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
753		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
754		},
755	},
756	{
757	 .callback = video_detect_force_native,
758	 /* Sony Vaio VPCY11S1E */
759	 .matches = {
760		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
761		DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
762		},
763	},
764
765	/*
766	 * These Toshibas have a broken acpi-video interface for brightness
767	 * control. They also have an issue where the panel is off after
768	 * suspend until a special firmware call is made to turn it back
769	 * on. This is handled by the toshiba_acpi kernel module, so that
770	 * module must be enabled for these models to work correctly.
771	 */
772	{
773	 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
774	 .callback = video_detect_force_native,
775	 /* Toshiba Portégé R700 */
776	 .matches = {
777		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
778		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
779		},
780	},
781	{
782	 /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
783	 /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
784	 .callback = video_detect_force_native,
785	 /* Toshiba Satellite/Portégé R830 */
786	 .matches = {
787		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
788		DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
789		},
790	},
791	{
792	 .callback = video_detect_force_native,
793	 /* Toshiba Satellite/Portégé Z830 */
794	 .matches = {
795		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
796		DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
797		},
798	},
799
800	/*
801	 * Models which have nvidia-ec-wmi support, but should not use it.
802	 * Note this indicates a likely firmware bug on these models and should
803	 * be revisited if/when Linux gets support for dynamic mux mode.
804	 */
805	{
806	 .callback = video_detect_force_native,
807	 /* Dell G15 5515 */
808	 .matches = {
809		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
810		DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
811		},
812	},
813	{
814	 .callback = video_detect_force_native,
815	 .matches = {
816		DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
817		DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
818		},
819	},
820
821	/*
822	 * x86 android tablets which directly control the backlight through
823	 * an external backlight controller, typically TI's LP8557.
824	 * The backlight is directly controlled by the lp855x driver on these.
825	 * This setup means that neither i915's native nor acpi_video backlight
826	 * control works. Add a "vendor" quirk to disable both. Note these
827	 * devices do not use vendor control in the typical meaning of
828	 * vendor specific SMBIOS or ACPI calls being used.
829	 */
830	{
831	 .callback = video_detect_force_vendor,
832	 /* Lenovo Yoga Book X90F / X90L */
833	 .matches = {
834		DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
835		DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
836		DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"),
837		},
838	},
839	{
840	 .callback = video_detect_force_vendor,
841	 /*
842	  * Lenovo Yoga Tablet 2 830F/L or 1050F/L (The 8" and 10"
843	  * Lenovo Yoga Tablet 2 use the same mainboard)
844	  */
845	 .matches = {
846		DMI_MATCH(DMI_SYS_VENDOR, "Intel Corp."),
847		DMI_MATCH(DMI_PRODUCT_NAME, "VALLEYVIEW C0 PLATFORM"),
848		DMI_MATCH(DMI_BOARD_NAME, "BYT-T FFD8"),
849		/* Partial match on beginning of BIOS version */
850		DMI_MATCH(DMI_BIOS_VERSION, "BLADE_21"),
851		},
852	},
853	{
854	 .callback = video_detect_force_vendor,
855	 /* Lenovo Yoga Tab 3 Pro YT3-X90F */
856	 .matches = {
857		DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
858		DMI_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"),
859		DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
860		},
861	},
862	{
863	 .callback = video_detect_force_vendor,
864	 /* Xiaomi Mi Pad 2 */
865	 .matches = {
866		DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
867		DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
868		},
869	},
870	{ },
871};
872
873static bool google_cros_ec_present(void)
874{
875	return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
876}
877
878/*
879 * Windows 8 and newer no longer use the ACPI video interface, so it often
880 * does not work. So on win8+ systems prefer native brightness control.
881 * Chromebooks should always prefer native backlight control.
882 */
883static bool prefer_native_over_acpi_video(void)
884{
885	return acpi_osi_is_win8() || google_cros_ec_present();
886}
887
888/*
889 * Determine which type of backlight interface to use on this system,
890 * First check cmdline, then dmi quirks, then do autodetect.
891 */
892enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
893{
894	static DEFINE_MUTEX(init_mutex);
895	static bool nvidia_wmi_ec_present;
896	static bool apple_gmux_present;
897	static bool native_available;
898	static bool init_done;
899	static long video_caps;
900
901	/* Parse cmdline, dmi and acpi only once */
902	mutex_lock(&init_mutex);
903	if (!init_done) {
904		acpi_video_parse_cmdline();
905		dmi_check_system(video_detect_dmi_table);
906		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
907				    ACPI_UINT32_MAX, find_video, NULL,
908				    &video_caps, NULL);
909		nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
910		apple_gmux_present = apple_gmux_detect(NULL, NULL);
911		init_done = true;
912	}
913	if (native)
914		native_available = true;
915	mutex_unlock(&init_mutex);
916
917	if (auto_detect)
918		*auto_detect = false;
919
920	/*
921	 * The below heuristics / detection steps are in order of descending
922	 * presedence. The commandline takes presedence over anything else.
923	 */
924	if (acpi_backlight_cmdline != acpi_backlight_undef)
925		return acpi_backlight_cmdline;
926
927	/* DMI quirks override any autodetection. */
928	if (acpi_backlight_dmi != acpi_backlight_undef)
929		return acpi_backlight_dmi;
930
931	if (auto_detect)
932		*auto_detect = true;
933
934	/* Special cases such as nvidia_wmi_ec and apple gmux. */
935	if (nvidia_wmi_ec_present)
936		return acpi_backlight_nvidia_wmi_ec;
937
938	if (apple_gmux_present)
939		return acpi_backlight_apple_gmux;
940
941	/* Use ACPI video if available, except when native should be preferred. */
942	if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
943	     !(native_available && prefer_native_over_acpi_video()))
944		return acpi_backlight_video;
945
946	/* Use native if available */
947	if (native_available)
948		return acpi_backlight_native;
949
950	/*
951	 * The vendor specific BIOS interfaces are only necessary for
952	 * laptops from before ~2008.
953	 *
954	 * For laptops from ~2008 till ~2023 this point is never reached
955	 * because on those (video_caps & ACPI_VIDEO_BACKLIGHT) above is true.
956	 *
957	 * Laptops from after ~2023 no longer support ACPI_VIDEO_BACKLIGHT,
958	 * if this point is reached on those, this likely means that
959	 * the GPU kms driver which sets native_available has not loaded yet.
960	 *
961	 * Returning acpi_backlight_vendor in this case is known to sometimes
962	 * cause a non working vendor specific /sys/class/backlight device to
963	 * get registered.
964	 *
965	 * Return acpi_backlight_none on laptops with ACPI tables written
966	 * for Windows 8 (laptops from after ~2012) to avoid this problem.
967	 */
968	if (acpi_osi_is_win8())
969		return acpi_backlight_none;
970
971	/* No ACPI video/native (old hw), use vendor specific fw methods. */
972	return acpi_backlight_vendor;
973}
974EXPORT_SYMBOL(__acpi_video_get_backlight_type);