tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
38ACPI_MODULE_NAME("video");
39#define _COMPONENT ACPI_VIDEO_COMPONENT
40
41void acpi_video_unregister_backlight(void);
42
43static bool backlight_notifier_registered;
44static struct notifier_block backlight_nb;
45static struct work_struct backlight_notify_work;
46
47static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
48static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
49
50static void acpi_video_parse_cmdline(void)
51{
52 if (!strcmp("vendor", acpi_video_backlight_string))
53 acpi_backlight_cmdline = acpi_backlight_vendor;
54 if (!strcmp("video", acpi_video_backlight_string))
55 acpi_backlight_cmdline = acpi_backlight_video;
56 if (!strcmp("native", acpi_video_backlight_string))
57 acpi_backlight_cmdline = acpi_backlight_native;
58 if (!strcmp("none", acpi_video_backlight_string))
59 acpi_backlight_cmdline = acpi_backlight_none;
60}
61
62static acpi_status
63find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
64{
65 long *cap = context;
66 struct pci_dev *dev;
67 struct acpi_device *acpi_dev;
68
69 static const struct acpi_device_id video_ids[] = {
70 {ACPI_VIDEO_HID, 0},
71 {"", 0},
72 };
73 if (acpi_bus_get_device(handle, &acpi_dev))
74 return AE_OK;
75
76 if (!acpi_match_device_ids(acpi_dev, video_ids)) {
77 dev = acpi_get_pci_dev(handle);
78 if (!dev)
79 return AE_OK;
80 pci_dev_put(dev);
81 *cap |= acpi_is_video_device(handle);
82 }
83 return AE_OK;
84}
85
86/* Force to use vendor driver when the ACPI device is known to be
87 * buggy */
88static int video_detect_force_vendor(const struct dmi_system_id *d)
89{
90 acpi_backlight_dmi = acpi_backlight_vendor;
91 return 0;
92}
93
94static int video_detect_force_video(const struct dmi_system_id *d)
95{
96 acpi_backlight_dmi = acpi_backlight_video;
97 return 0;
98}
99
100static int video_detect_force_native(const struct dmi_system_id *d)
101{
102 acpi_backlight_dmi = acpi_backlight_native;
103 return 0;
104}
105
106static int video_detect_force_none(const struct dmi_system_id *d)
107{
108 acpi_backlight_dmi = acpi_backlight_none;
109 return 0;
110}
111
112static const struct dmi_system_id video_detect_dmi_table[] = {
113 /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
114 * ACPI backlight device is used. This flag will definitively break
115 * the backlight interface (even the vendor interface) until next
116 * reboot. It's why we should prevent video.ko from being used here
117 * and we can't rely on a later call to acpi_video_unregister().
118 */
119 {
120 .callback = video_detect_force_vendor,
121 .ident = "X360",
122 .matches = {
123 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
124 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
125 DMI_MATCH(DMI_BOARD_NAME, "X360"),
126 },
127 },
128 {
129 .callback = video_detect_force_vendor,
130 .ident = "Asus UL30VT",
131 .matches = {
132 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
133 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
134 },
135 },
136 {
137 .callback = video_detect_force_vendor,
138 .ident = "Asus UL30A",
139 .matches = {
140 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
141 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
142 },
143 },
144 {
145 .callback = video_detect_force_vendor,
146 .ident = "Sony VPCEH3U1E",
147 .matches = {
148 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
149 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
150 },
151 },
152
153 /*
154 * These models have a working acpi_video backlight control, and using
155 * native backlight causes a regression where backlight does not work
156 * when userspace is not handling brightness key events. Disable
157 * native_backlight on these to fix this:
158 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
159 */
160 {
161 .callback = video_detect_force_video,
162 .ident = "ThinkPad T420",
163 .matches = {
164 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
165 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
166 },
167 },
168 {
169 .callback = video_detect_force_video,
170 .ident = "ThinkPad T520",
171 .matches = {
172 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
173 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
174 },
175 },
176 {
177 .callback = video_detect_force_video,
178 .ident = "ThinkPad X201s",
179 .matches = {
180 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
181 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
182 },
183 },
184 {
185 .callback = video_detect_force_video,
186 .ident = "ThinkPad X201T",
187 .matches = {
188 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
189 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
190 },
191 },
192
193 /* The native backlight controls do not work on some older machines */
194 {
195 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
196 .callback = video_detect_force_video,
197 .ident = "HP ENVY 15 Notebook",
198 .matches = {
199 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
200 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
201 },
202 },
203 {
204 .callback = video_detect_force_video,
205 .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
206 .matches = {
207 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
208 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
209 },
210 },
211 {
212 .callback = video_detect_force_video,
213 .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
214 .matches = {
215 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
216 DMI_MATCH(DMI_PRODUCT_NAME,
217 "370R4E/370R4V/370R5E/3570RE/370R5V"),
218 },
219 },
220 {
221 /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
222 .callback = video_detect_force_video,
223 .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
224 .matches = {
225 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
226 DMI_MATCH(DMI_PRODUCT_NAME,
227 "3570R/370R/470R/450R/510R/4450RV"),
228 },
229 },
230 {
231 /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
232 .callback = video_detect_force_video,
233 .ident = "SAMSUNG 670Z5E",
234 .matches = {
235 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
236 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
237 },
238 },
239 {
240 /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
241 .callback = video_detect_force_video,
242 .ident = "SAMSUNG 730U3E/740U3E",
243 .matches = {
244 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
245 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
246 },
247 },
248 {
249 /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
250 .callback = video_detect_force_video,
251 .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
252 .matches = {
253 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
254 DMI_MATCH(DMI_PRODUCT_NAME,
255 "900X3C/900X3D/900X3E/900X4C/900X4D"),
256 },
257 },
258 {
259 /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
260 .callback = video_detect_force_video,
261 .ident = "Dell XPS14 L421X",
262 .matches = {
263 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
264 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
265 },
266 },
267 {
268 /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
269 .callback = video_detect_force_video,
270 .ident = "Dell XPS15 L521X",
271 .matches = {
272 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
273 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
274 },
275 },
276 {
277 /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
278 .callback = video_detect_force_video,
279 .ident = "SAMSUNG 530U4E/540U4E",
280 .matches = {
281 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
282 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
283 },
284 },
285
286 /* Non win8 machines which need native backlight nevertheless */
287 {
288 /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
289 .callback = video_detect_force_native,
290 .ident = "Lenovo Ideapad S405",
291 .matches = {
292 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
293 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
294 },
295 },
296 {
297 /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
298 .callback = video_detect_force_native,
299 .ident = "Lenovo Ideapad Z570",
300 .matches = {
301 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
302 DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
303 },
304 },
305 {
306 .callback = video_detect_force_native,
307 .ident = "Lenovo E41-25",
308 .matches = {
309 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
310 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
311 },
312 },
313 {
314 .callback = video_detect_force_native,
315 .ident = "Lenovo E41-45",
316 .matches = {
317 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
318 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
319 },
320 },
321 {
322 /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
323 .callback = video_detect_force_native,
324 .ident = "Apple MacBook Pro 12,1",
325 .matches = {
326 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
327 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
328 },
329 },
330 {
331 .callback = video_detect_force_native,
332 .ident = "Dell Vostro V131",
333 .matches = {
334 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
335 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
336 },
337 },
338 {
339 /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
340 .callback = video_detect_force_native,
341 .ident = "Dell XPS 17 L702X",
342 .matches = {
343 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
344 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
345 },
346 },
347 {
348 .callback = video_detect_force_native,
349 .ident = "Dell Precision 7510",
350 .matches = {
351 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
352 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
353 },
354 },
355 {
356 .callback = video_detect_force_native,
357 .ident = "Acer Aspire 5738z",
358 .matches = {
359 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
360 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
361 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
362 },
363 },
364
365 /*
366 * Desktops which falsely report a backlight and which our heuristics
367 * for this do not catch.
368 */
369 {
370 .callback = video_detect_force_none,
371 .ident = "Dell OptiPlex 9020M",
372 .matches = {
373 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
374 DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"),
375 },
376 },
377 {
378 .callback = video_detect_force_none,
379 .ident = "MSI MS-7721",
380 .matches = {
381 DMI_MATCH(DMI_SYS_VENDOR, "MSI"),
382 DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"),
383 },
384 },
385 { },
386};
387
388/* This uses a workqueue to avoid various locking ordering issues */
389static void acpi_video_backlight_notify_work(struct work_struct *work)
390{
391 if (acpi_video_get_backlight_type() != acpi_backlight_video)
392 acpi_video_unregister_backlight();
393}
394
395static int acpi_video_backlight_notify(struct notifier_block *nb,
396 unsigned long val, void *bd)
397{
398 struct backlight_device *backlight = bd;
399
400 /* A raw bl registering may change video -> native */
401 if (backlight->props.type == BACKLIGHT_RAW &&
402 val == BACKLIGHT_REGISTERED)
403 schedule_work(&backlight_notify_work);
404
405 return NOTIFY_OK;
406}
407
408/*
409 * Determine which type of backlight interface to use on this system,
410 * First check cmdline, then dmi quirks, then do autodetect.
411 *
412 * The autodetect order is:
413 * 1) Is the acpi-video backlight interface supported ->
414 * no, use a vendor interface
415 * 2) Is this a win8 "ready" BIOS and do we have a native interface ->
416 * yes, use a native interface
417 * 3) Else use the acpi-video interface
418 *
419 * Arguably the native on win8 check should be done first, but that would
420 * be a behavior change, which may causes issues.
421 */
422enum acpi_backlight_type acpi_video_get_backlight_type(void)
423{
424 static DEFINE_MUTEX(init_mutex);
425 static bool init_done;
426 static long video_caps;
427
428 /* Parse cmdline, dmi and acpi only once */
429 mutex_lock(&init_mutex);
430 if (!init_done) {
431 acpi_video_parse_cmdline();
432 dmi_check_system(video_detect_dmi_table);
433 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
434 ACPI_UINT32_MAX, find_video, NULL,
435 &video_caps, NULL);
436 INIT_WORK(&backlight_notify_work,
437 acpi_video_backlight_notify_work);
438 backlight_nb.notifier_call = acpi_video_backlight_notify;
439 backlight_nb.priority = 0;
440 if (backlight_register_notifier(&backlight_nb) == 0)
441 backlight_notifier_registered = true;
442 init_done = true;
443 }
444 mutex_unlock(&init_mutex);
445
446 if (acpi_backlight_cmdline != acpi_backlight_undef)
447 return acpi_backlight_cmdline;
448
449 if (acpi_backlight_dmi != acpi_backlight_undef)
450 return acpi_backlight_dmi;
451
452 if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
453 return acpi_backlight_vendor;
454
455 if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW))
456 return acpi_backlight_native;
457
458 return acpi_backlight_video;
459}
460EXPORT_SYMBOL(acpi_video_get_backlight_type);
461
462/*
463 * Set the preferred backlight interface type based on DMI info.
464 * This function allows DMI blacklists to be implemented by external
465 * platform drivers instead of putting a big blacklist in video_detect.c
466 */
467void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
468{
469 acpi_backlight_dmi = type;
470 /* Remove acpi-video backlight interface if it is no longer desired */
471 if (acpi_video_get_backlight_type() != acpi_backlight_video)
472 acpi_video_unregister_backlight();
473}
474EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
475
476void __exit acpi_video_detect_exit(void)
477{
478 if (backlight_notifier_registered)
479 backlight_unregister_notifier(&backlight_nb);
480}