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
21 * which driver should handle the backlight.
22 *
23 * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
24 * this file will not be compiled and acpi_video_get_backlight_type() will
25 * always return acpi_backlight_vendor.
26 */
27
28 #include <linux/export.h>
29 #include <linux/acpi.h>
30 #include <linux/backlight.h>
31 #include <linux/dmi.h>
32 #include <linux/module.h>
33 #include <linux/pci.h>
34 #include <linux/types.h>
35 #include <linux/workqueue.h>
36 #include <acpi/video.h>
37
38 void acpi_video_unregister_backlight(void);
39
40 static bool backlight_notifier_registered;
41 static struct notifier_block backlight_nb;
42 static struct work_struct backlight_notify_work;
43
44 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
45 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
46
acpi_video_parse_cmdline(void)47 static void acpi_video_parse_cmdline(void)
48 {
49 if (!strcmp("vendor", acpi_video_backlight_string))
50 acpi_backlight_cmdline = acpi_backlight_vendor;
51 if (!strcmp("video", acpi_video_backlight_string))
52 acpi_backlight_cmdline = acpi_backlight_video;
53 if (!strcmp("native", acpi_video_backlight_string))
54 acpi_backlight_cmdline = acpi_backlight_native;
55 if (!strcmp("none", acpi_video_backlight_string))
56 acpi_backlight_cmdline = acpi_backlight_none;
57 }
58
59 static acpi_status
find_video(acpi_handle handle,u32 lvl,void * context,void ** rv)60 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
61 {
62 long *cap = context;
63 struct pci_dev *dev;
64 struct acpi_device *acpi_dev;
65
66 static const struct acpi_device_id video_ids[] = {
67 {ACPI_VIDEO_HID, 0},
68 {"", 0},
69 };
70 if (acpi_bus_get_device(handle, &acpi_dev))
71 return AE_OK;
72
73 if (!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 /* Force to use vendor driver when the ACPI device is known to be
84 * buggy */
video_detect_force_vendor(const struct dmi_system_id * d)85 static int video_detect_force_vendor(const struct dmi_system_id *d)
86 {
87 acpi_backlight_dmi = acpi_backlight_vendor;
88 return 0;
89 }
90
video_detect_force_video(const struct dmi_system_id * d)91 static int video_detect_force_video(const struct dmi_system_id *d)
92 {
93 acpi_backlight_dmi = acpi_backlight_video;
94 return 0;
95 }
96
video_detect_force_native(const struct dmi_system_id * d)97 static int video_detect_force_native(const struct dmi_system_id *d)
98 {
99 acpi_backlight_dmi = acpi_backlight_native;
100 return 0;
101 }
102
video_detect_force_none(const struct dmi_system_id * d)103 static int video_detect_force_none(const struct dmi_system_id *d)
104 {
105 acpi_backlight_dmi = acpi_backlight_none;
106 return 0;
107 }
108
109 static const struct dmi_system_id video_detect_dmi_table[] = {
110 /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
111 * ACPI backlight device is used. This flag will definitively break
112 * the backlight interface (even the vendor interface) until next
113 * reboot. It's why we should prevent video.ko from being used here
114 * and we can't rely on a later call to acpi_video_unregister().
115 */
116 {
117 .callback = video_detect_force_vendor,
118 /* X360 */
119 .matches = {
120 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
121 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
122 DMI_MATCH(DMI_BOARD_NAME, "X360"),
123 },
124 },
125 {
126 .callback = video_detect_force_vendor,
127 /* Asus UL30VT */
128 .matches = {
129 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
130 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
131 },
132 },
133 {
134 .callback = video_detect_force_vendor,
135 /* Asus UL30A */
136 .matches = {
137 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
138 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
139 },
140 },
141 {
142 .callback = video_detect_force_vendor,
143 /* GIGABYTE GB-BXBT-2807 */
144 .matches = {
145 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
146 DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"),
147 },
148 },
149 {
150 .callback = video_detect_force_vendor,
151 /* Sony VPCEH3U1E */
152 .matches = {
153 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
154 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
155 },
156 },
157 {
158 .callback = video_detect_force_vendor,
159 /* Xiaomi Mi Pad 2 */
160 .matches = {
161 DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
162 DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
163 },
164 },
165
166 /*
167 * These models have a working acpi_video backlight control, and using
168 * native backlight causes a regression where backlight does not work
169 * when userspace is not handling brightness key events. Disable
170 * native_backlight on these to fix this:
171 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
172 */
173 {
174 .callback = video_detect_force_video,
175 /* ThinkPad T420 */
176 .matches = {
177 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
178 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
179 },
180 },
181 {
182 .callback = video_detect_force_video,
183 /* ThinkPad T520 */
184 .matches = {
185 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
186 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
187 },
188 },
189 {
190 .callback = video_detect_force_video,
191 /* ThinkPad X201s */
192 .matches = {
193 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
194 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
195 },
196 },
197 {
198 .callback = video_detect_force_video,
199 /* ThinkPad X201T */
200 .matches = {
201 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
202 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
203 },
204 },
205
206 /* The native backlight controls do not work on some older machines */
207 {
208 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
209 .callback = video_detect_force_video,
210 /* HP ENVY 15 Notebook */
211 .matches = {
212 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
213 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
214 },
215 },
216 {
217 .callback = video_detect_force_video,
218 /* SAMSUNG 870Z5E/880Z5E/680Z5E */
219 .matches = {
220 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
221 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
222 },
223 },
224 {
225 .callback = video_detect_force_video,
226 /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
227 .matches = {
228 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
229 DMI_MATCH(DMI_PRODUCT_NAME,
230 "370R4E/370R4V/370R5E/3570RE/370R5V"),
231 },
232 },
233 {
234 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
235 .callback = video_detect_force_video,
236 /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
237 .matches = {
238 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
239 DMI_MATCH(DMI_PRODUCT_NAME,
240 "3570R/370R/470R/450R/510R/4450RV"),
241 },
242 },
243 {
244 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
245 .callback = video_detect_force_video,
246 /* SAMSUNG 670Z5E */
247 .matches = {
248 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
249 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
250 },
251 },
252 {
253 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
254 .callback = video_detect_force_video,
255 /* SAMSUNG 730U3E/740U3E */
256 .matches = {
257 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
258 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
259 },
260 },
261 {
262 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
263 .callback = video_detect_force_video,
264 /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
265 .matches = {
266 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
267 DMI_MATCH(DMI_PRODUCT_NAME,
268 "900X3C/900X3D/900X3E/900X4C/900X4D"),
269 },
270 },
271 {
272 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
273 .callback = video_detect_force_video,
274 /* Dell XPS14 L421X */
275 .matches = {
276 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
277 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
278 },
279 },
280 {
281 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
282 .callback = video_detect_force_video,
283 /* Dell XPS15 L521X */
284 .matches = {
285 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
286 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
287 },
288 },
289 {
290 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
291 .callback = video_detect_force_video,
292 /* SAMSUNG 530U4E/540U4E */
293 .matches = {
294 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
295 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
296 },
297 },
298 /* https://bugs.launchpad.net/bugs/1894667 */
299 {
300 .callback = video_detect_force_video,
301 /* HP 635 Notebook */
302 .matches = {
303 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
304 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
305 },
306 },
307
308 /* Non win8 machines which need native backlight nevertheless */
309 {
310 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
311 .callback = video_detect_force_native,
312 /* Lenovo Ideapad S405 */
313 .matches = {
314 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
315 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
316 },
317 },
318 {
319 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
320 .callback = video_detect_force_native,
321 /* Lenovo Ideapad Z570 */
322 .matches = {
323 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
324 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
325 },
326 },
327 {
328 .callback = video_detect_force_native,
329 /* Lenovo E41-25 */
330 .matches = {
331 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
332 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
333 },
334 },
335 {
336 .callback = video_detect_force_native,
337 /* Lenovo E41-45 */
338 .matches = {
339 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
340 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
341 },
342 },
343 {
344 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
345 .callback = video_detect_force_native,
346 /* Apple MacBook Pro 12,1 */
347 .matches = {
348 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
349 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
350 },
351 },
352 {
353 .callback = video_detect_force_native,
354 /* Dell Vostro V131 */
355 .matches = {
356 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
357 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
358 },
359 },
360 {
361 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
362 .callback = video_detect_force_native,
363 /* Dell XPS 17 L702X */
364 .matches = {
365 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
366 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
367 },
368 },
369 {
370 .callback = video_detect_force_native,
371 /* Dell Precision 7510 */
372 .matches = {
373 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
374 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
375 },
376 },
377 {
378 .callback = video_detect_force_native,
379 /* Acer Aspire 5738z */
380 .matches = {
381 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
382 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
383 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
384 },
385 },
386 {
387 /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
388 .callback = video_detect_force_native,
389 /* Acer TravelMate 5735Z */
390 .matches = {
391 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
392 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
393 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
394 },
395 },
396 {
397 .callback = video_detect_force_native,
398 /* ASUSTeK COMPUTER INC. GA401 */
399 .matches = {
400 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
401 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
402 },
403 },
404 {
405 .callback = video_detect_force_native,
406 /* ASUSTeK COMPUTER INC. GA502 */
407 .matches = {
408 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
409 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
410 },
411 },
412 {
413 .callback = video_detect_force_native,
414 /* ASUSTeK COMPUTER INC. GA503 */
415 .matches = {
416 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
417 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
418 },
419 },
420
421 /*
422 * Desktops which falsely report a backlight and which our heuristics
423 * for this do not catch.
424 */
425 {
426 .callback = video_detect_force_none,
427 /* Dell OptiPlex 9020M */
428 .matches = {
429 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
430 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
431 },
432 },
433 {
434 .callback = video_detect_force_none,
435 /* MSI MS-7721 */
436 .matches = {
437 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
439 },
440 },
441 { },
442 };
443
444 /* This uses a workqueue to avoid various locking ordering issues */
acpi_video_backlight_notify_work(struct work_struct * work)445 static void acpi_video_backlight_notify_work(struct work_struct *work)
446 {
447 if (acpi_video_get_backlight_type() != acpi_backlight_video)
448 acpi_video_unregister_backlight();
449 }
450
acpi_video_backlight_notify(struct notifier_block * nb,unsigned long val,void * bd)451 static int acpi_video_backlight_notify(struct notifier_block *nb,
452 unsigned long val, void *bd)
453 {
454 struct backlight_device *backlight = bd;
455
456 /* A raw bl registering may change video -> native */
457 if (backlight->props.type == BACKLIGHT_RAW &&
458 val == BACKLIGHT_REGISTERED)
459 schedule_work(&backlight_notify_work);
460
461 return NOTIFY_OK;
462 }
463
464 /*
465 * Determine which type of backlight interface to use on this system,
466 * First check cmdline, then dmi quirks, then do autodetect.
467 *
468 * The autodetect order is:
469 * 1) Is the acpi-video backlight interface supported ->
470 * no, use a vendor interface
471 * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
472 * yes, use a native interface
473 * 3) Else use the acpi-video interface
474 *
475 * Arguably the native on win8 check should be done first, but that would
476 * be a behavior change, which may causes issues.
477 */
acpi_video_get_backlight_type(void)478 enum acpi_backlight_type acpi_video_get_backlight_type(void)
479 {
480 static DEFINE_MUTEX(init_mutex);
481 static bool init_done;
482 static long video_caps;
483
484 /* Parse cmdline, dmi and acpi only once */
485 mutex_lock(&init_mutex);
486 if (!init_done) {
487 acpi_video_parse_cmdline();
488 dmi_check_system(video_detect_dmi_table);
489 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
490 ACPI_UINT32_MAX, find_video, NULL,
491 &video_caps, NULL);
492 INIT_WORK(&backlight_notify_work,
493 acpi_video_backlight_notify_work);
494 backlight_nb.notifier_call = acpi_video_backlight_notify;
495 backlight_nb.priority = 0;
496 if (backlight_register_notifier(&backlight_nb) == 0)
497 backlight_notifier_registered = true;
498 init_done = true;
499 }
500 mutex_unlock(&init_mutex);
501
502 if (acpi_backlight_cmdline != acpi_backlight_undef)
503 return acpi_backlight_cmdline;
504
505 if (acpi_backlight_dmi != acpi_backlight_undef)
506 return acpi_backlight_dmi;
507
508 if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
509 return acpi_backlight_vendor;
510
511 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
512 return acpi_backlight_native;
513
514 return acpi_backlight_video;
515 }
516 EXPORT_SYMBOL(acpi_video_get_backlight_type);
517
518 /*
519 * Set the preferred backlight interface type based on DMI info.
520 * This function allows DMI blacklists to be implemented by external
521 * platform drivers instead of putting a big blacklist in video_detect.c
522 */
acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)523 void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
524 {
525 acpi_backlight_dmi = type;
526 /* Remove acpi-video backlight interface if it is no longer desired */
527 if (acpi_video_get_backlight_type() != acpi_backlight_video)
528 acpi_video_unregister_backlight();
529 }
530 EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
531
acpi_video_detect_exit(void)532 void __exit acpi_video_detect_exit(void)
533 {
534 if (backlight_notifier_registered)
535 backlight_unregister_notifier(&backlight_nb);
536 }
537