Commit | Line | Data |
---|---|---|
c3d6de69 | 1 | /* |
87521e16 HG |
2 | * Copyright (C) 2015 Red Hat Inc. |
3 | * Hans de Goede <hdegoede@redhat.com> | |
c3d6de69 TR |
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: | |
c3d6de69 | 10 | * After PCI devices are glued with ACPI devices |
1e4cffe7 | 11 | * acpi_get_pci_dev() can be called to identify ACPI graphics |
c3d6de69 TR |
12 | * devices for which a real graphics card is plugged in |
13 | * | |
c3d6de69 TR |
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 | * | |
7ec48ced | 17 | * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop, |
677bd810 | 18 | * sony_acpi,... can take care about backlight brightness. |
c3d6de69 | 19 | * |
87521e16 HG |
20 | * Backlight drivers can use acpi_video_get_backlight_type() to determine |
21 | * which driver should handle the backlight. | |
c3d6de69 | 22 | * |
87521e16 HG |
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. | |
c3d6de69 TR |
26 | */ |
27 | ||
214f2c90 | 28 | #include <linux/export.h> |
c3d6de69 | 29 | #include <linux/acpi.h> |
87521e16 | 30 | #include <linux/backlight.h> |
c3d6de69 | 31 | #include <linux/dmi.h> |
14ca7a47 | 32 | #include <linux/module.h> |
1e4cffe7 | 33 | #include <linux/pci.h> |
87521e16 | 34 | #include <linux/types.h> |
7231ed1a | 35 | #include <linux/workqueue.h> |
87521e16 | 36 | #include <acpi/video.h> |
c3d6de69 | 37 | |
e7d024c0 HG |
38 | void acpi_video_unregister_backlight(void); |
39 | ||
93a291df HG |
40 | static bool backlight_notifier_registered; |
41 | static struct notifier_block backlight_nb; | |
7231ed1a | 42 | static struct work_struct backlight_notify_work; |
93a291df | 43 | |
87521e16 HG |
44 | static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; |
45 | static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; | |
c3d6de69 | 46 | |
14ca7a47 HG |
47 | static void acpi_video_parse_cmdline(void) |
48 | { | |
49 | if (!strcmp("vendor", acpi_video_backlight_string)) | |
87521e16 | 50 | acpi_backlight_cmdline = acpi_backlight_vendor; |
14ca7a47 | 51 | if (!strcmp("video", acpi_video_backlight_string)) |
87521e16 HG |
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; | |
14ca7a47 HG |
57 | } |
58 | ||
c3d6de69 TR |
59 | static acpi_status |
60 | find_video(acpi_handle handle, u32 lvl, void *context, void **rv) | |
61 | { | |
99ece713 | 62 | struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle); |
c3d6de69 | 63 | long *cap = context; |
1e4cffe7 | 64 | struct pci_dev *dev; |
c3d6de69 | 65 | |
4a4f01a6 | 66 | static const struct acpi_device_id video_ids[] = { |
c3d6de69 TR |
67 | {ACPI_VIDEO_HID, 0}, |
68 | {"", 0}, | |
69 | }; | |
c3d6de69 | 70 | |
99ece713 | 71 | if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) { |
1e4cffe7 | 72 | dev = acpi_get_pci_dev(handle); |
c3d6de69 TR |
73 | if (!dev) |
74 | return AE_OK; | |
1e4cffe7 | 75 | pci_dev_put(dev); |
d4e1a692 | 76 | *cap |= acpi_is_video_device(handle); |
c3d6de69 TR |
77 | } |
78 | return AE_OK; | |
79 | } | |
80 | ||
084940d5 CC |
81 | /* Force to use vendor driver when the ACPI device is known to be |
82 | * buggy */ | |
83 | static int video_detect_force_vendor(const struct dmi_system_id *d) | |
84 | { | |
87521e16 | 85 | acpi_backlight_dmi = acpi_backlight_vendor; |
084940d5 CC |
86 | return 0; |
87 | } | |
88 | ||
3bd6bce3 HG |
89 | static int video_detect_force_video(const struct dmi_system_id *d) |
90 | { | |
91 | acpi_backlight_dmi = acpi_backlight_video; | |
92 | return 0; | |
93 | } | |
94 | ||
95 | static int video_detect_force_native(const struct dmi_system_id *d) | |
96 | { | |
97 | acpi_backlight_dmi = acpi_backlight_native; | |
98 | return 0; | |
99 | } | |
100 | ||
1f59ab27 AH |
101 | static int video_detect_force_none(const struct dmi_system_id *d) |
102 | { | |
103 | acpi_backlight_dmi = acpi_backlight_none; | |
104 | return 0; | |
105 | } | |
106 | ||
4a4f01a6 | 107 | static const struct dmi_system_id video_detect_dmi_table[] = { |
084940d5 CC |
108 | /* On Samsung X360, the BIOS will set a flag (VDRV) if generic |
109 | * ACPI backlight device is used. This flag will definitively break | |
603fadf3 | 110 | * the backlight interface (even the vendor interface) until next |
084940d5 CC |
111 | * reboot. It's why we should prevent video.ko from being used here |
112 | * and we can't rely on a later call to acpi_video_unregister(). | |
113 | */ | |
114 | { | |
115 | .callback = video_detect_force_vendor, | |
3b6740bd | 116 | /* X360 */ |
084940d5 CC |
117 | .matches = { |
118 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
119 | DMI_MATCH(DMI_PRODUCT_NAME, "X360"), | |
120 | DMI_MATCH(DMI_BOARD_NAME, "X360"), | |
121 | }, | |
122 | }, | |
d0c2ce16 LT |
123 | { |
124 | .callback = video_detect_force_vendor, | |
3b6740bd | 125 | /* Asus UL30VT */ |
d0c2ce16 LT |
126 | .matches = { |
127 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
128 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), | |
129 | }, | |
130 | }, | |
c8f6d835 BT |
131 | { |
132 | .callback = video_detect_force_vendor, | |
3b6740bd | 133 | /* Asus UL30A */ |
c8f6d835 BT |
134 | .matches = { |
135 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
136 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), | |
137 | }, | |
138 | }, | |
aefa763b ZR |
139 | { |
140 | .callback = video_detect_force_vendor, | |
3b6740bd | 141 | /* GIGABYTE GB-BXBT-2807 */ |
25417185 JSP |
142 | .matches = { |
143 | DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), | |
144 | DMI_MATCH(DMI_PRODUCT_NAME, "GB-BXBT-2807"), | |
145 | }, | |
146 | }, | |
147 | { | |
c1d1e25a | 148 | .callback = video_detect_force_vendor, |
3b6740bd | 149 | /* Sony VPCEH3U1E */ |
aefa763b ZR |
150 | .matches = { |
151 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
152 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), | |
153 | }, | |
154 | }, | |
60e6655f HG |
155 | { |
156 | .callback = video_detect_force_vendor, | |
157 | /* Xiaomi Mi Pad 2 */ | |
158 | .matches = { | |
159 | DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"), | |
160 | DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"), | |
161 | }, | |
162 | }, | |
3bd6bce3 HG |
163 | |
164 | /* | |
165 | * These models have a working acpi_video backlight control, and using | |
166 | * native backlight causes a regression where backlight does not work | |
167 | * when userspace is not handling brightness key events. Disable | |
168 | * native_backlight on these to fix this: | |
169 | * https://bugzilla.kernel.org/show_bug.cgi?id=81691 | |
170 | */ | |
171 | { | |
172 | .callback = video_detect_force_video, | |
3b6740bd | 173 | /* ThinkPad T420 */ |
3bd6bce3 HG |
174 | .matches = { |
175 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
176 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), | |
177 | }, | |
178 | }, | |
179 | { | |
180 | .callback = video_detect_force_video, | |
3b6740bd | 181 | /* ThinkPad T520 */ |
3bd6bce3 HG |
182 | .matches = { |
183 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
184 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), | |
185 | }, | |
186 | }, | |
187 | { | |
188 | .callback = video_detect_force_video, | |
3b6740bd | 189 | /* ThinkPad X201s */ |
3bd6bce3 HG |
190 | .matches = { |
191 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
192 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), | |
193 | }, | |
194 | }, | |
c6237b21 ML |
195 | { |
196 | .callback = video_detect_force_video, | |
3b6740bd | 197 | /* ThinkPad X201T */ |
c6237b21 ML |
198 | .matches = { |
199 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
200 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"), | |
201 | }, | |
202 | }, | |
3bd6bce3 HG |
203 | |
204 | /* The native backlight controls do not work on some older machines */ | |
205 | { | |
206 | /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ | |
207 | .callback = video_detect_force_video, | |
3b6740bd | 208 | /* HP ENVY 15 Notebook */ |
3bd6bce3 HG |
209 | .matches = { |
210 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
211 | DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), | |
212 | }, | |
213 | }, | |
214 | { | |
215 | .callback = video_detect_force_video, | |
3b6740bd | 216 | /* SAMSUNG 870Z5E/880Z5E/680Z5E */ |
3bd6bce3 HG |
217 | .matches = { |
218 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
219 | DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), | |
220 | }, | |
221 | }, | |
222 | { | |
223 | .callback = video_detect_force_video, | |
3b6740bd | 224 | /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */ |
3bd6bce3 HG |
225 | .matches = { |
226 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
227 | DMI_MATCH(DMI_PRODUCT_NAME, | |
228 | "370R4E/370R4V/370R5E/3570RE/370R5V"), | |
229 | }, | |
230 | }, | |
231 | { | |
232 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ | |
233 | .callback = video_detect_force_video, | |
3b6740bd | 234 | /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */ |
3bd6bce3 HG |
235 | .matches = { |
236 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
237 | DMI_MATCH(DMI_PRODUCT_NAME, | |
238 | "3570R/370R/470R/450R/510R/4450RV"), | |
239 | }, | |
240 | }, | |
bbf03861 HG |
241 | { |
242 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */ | |
243 | .callback = video_detect_force_video, | |
3b6740bd | 244 | /* SAMSUNG 670Z5E */ |
bbf03861 HG |
245 | .matches = { |
246 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
247 | DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"), | |
248 | }, | |
249 | }, | |
3bd6bce3 HG |
250 | { |
251 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ | |
252 | .callback = video_detect_force_video, | |
3b6740bd | 253 | /* SAMSUNG 730U3E/740U3E */ |
3bd6bce3 HG |
254 | .matches = { |
255 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
256 | DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), | |
257 | }, | |
258 | }, | |
259 | { | |
260 | /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ | |
261 | .callback = video_detect_force_video, | |
3b6740bd | 262 | /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */ |
3bd6bce3 HG |
263 | .matches = { |
264 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
265 | DMI_MATCH(DMI_PRODUCT_NAME, | |
266 | "900X3C/900X3D/900X3E/900X4C/900X4D"), | |
267 | }, | |
268 | }, | |
61f9738d HG |
269 | { |
270 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ | |
271 | .callback = video_detect_force_video, | |
3b6740bd | 272 | /* Dell XPS14 L421X */ |
61f9738d HG |
273 | .matches = { |
274 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
275 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), | |
276 | }, | |
277 | }, | |
3bd6bce3 HG |
278 | { |
279 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ | |
280 | .callback = video_detect_force_video, | |
3b6740bd | 281 | /* Dell XPS15 L521X */ |
3bd6bce3 HG |
282 | .matches = { |
283 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
284 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), | |
285 | }, | |
286 | }, | |
49eb5208 AL |
287 | { |
288 | /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ | |
289 | .callback = video_detect_force_video, | |
3b6740bd | 290 | /* SAMSUNG 530U4E/540U4E */ |
49eb5208 AL |
291 | .matches = { |
292 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
293 | DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), | |
294 | }, | |
295 | }, | |
b226faab AH |
296 | /* https://bugs.launchpad.net/bugs/1894667 */ |
297 | { | |
298 | .callback = video_detect_force_video, | |
3b6740bd | 299 | /* HP 635 Notebook */ |
b226faab AH |
300 | .matches = { |
301 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
302 | DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), | |
303 | }, | |
304 | }, | |
3bd6bce3 HG |
305 | |
306 | /* Non win8 machines which need native backlight nevertheless */ | |
584d8d1e HG |
307 | { |
308 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ | |
309 | .callback = video_detect_force_native, | |
3b6740bd | 310 | /* Lenovo Ideapad S405 */ |
584d8d1e HG |
311 | .matches = { |
312 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
313 | DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), | |
314 | }, | |
315 | }, | |
3bd6bce3 HG |
316 | { |
317 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ | |
318 | .callback = video_detect_force_native, | |
3b6740bd | 319 | /* Lenovo Ideapad Z570 */ |
3bd6bce3 HG |
320 | .matches = { |
321 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
322 | DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), | |
323 | }, | |
324 | }, | |
53870cf0 AM |
325 | { |
326 | .callback = video_detect_force_native, | |
3b6740bd | 327 | /* Lenovo E41-25 */ |
53870cf0 AM |
328 | .matches = { |
329 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
330 | DMI_MATCH(DMI_PRODUCT_NAME, "81FS"), | |
331 | }, | |
332 | }, | |
333 | { | |
334 | .callback = video_detect_force_native, | |
3b6740bd | 335 | /* Lenovo E41-45 */ |
53870cf0 AM |
336 | .matches = { |
337 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
338 | DMI_MATCH(DMI_PRODUCT_NAME, "82BK"), | |
339 | }, | |
340 | }, | |
3bd6bce3 HG |
341 | { |
342 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ | |
343 | .callback = video_detect_force_native, | |
3b6740bd | 344 | /* Apple MacBook Pro 12,1 */ |
3bd6bce3 HG |
345 | .matches = { |
346 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
347 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), | |
348 | }, | |
349 | }, | |
4b4b3b20 HG |
350 | { |
351 | .callback = video_detect_force_native, | |
3b6740bd | 352 | /* Dell Vostro V131 */ |
4b4b3b20 HG |
353 | .matches = { |
354 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
355 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), | |
356 | }, | |
357 | }, | |
350fa038 HG |
358 | { |
359 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */ | |
360 | .callback = video_detect_force_native, | |
3b6740bd | 361 | /* Dell XPS 17 L702X */ |
350fa038 HG |
362 | .matches = { |
363 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
364 | DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"), | |
365 | }, | |
366 | }, | |
d37efb79 SYLF |
367 | { |
368 | .callback = video_detect_force_native, | |
3b6740bd | 369 | /* Dell Precision 7510 */ |
d37efb79 SYLF |
370 | .matches = { |
371 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
372 | DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"), | |
373 | }, | |
374 | }, | |
1c8fbc1f HG |
375 | { |
376 | .callback = video_detect_force_native, | |
3b6740bd | 377 | /* Acer Aspire 5738z */ |
1c8fbc1f HG |
378 | .matches = { |
379 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
380 | DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"), | |
381 | DMI_MATCH(DMI_BOARD_NAME, "JV50"), | |
382 | }, | |
383 | }, | |
c41c36e9 PM |
384 | { |
385 | /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */ | |
386 | .callback = video_detect_force_native, | |
3b6740bd | 387 | /* Acer TravelMate 5735Z */ |
c41c36e9 PM |
388 | .matches = { |
389 | DMI_MATCH(DMI_SYS_VENDOR, "Acer"), | |
390 | DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"), | |
391 | DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"), | |
392 | }, | |
393 | }, | |
2dfbacc6 LJ |
394 | { |
395 | .callback = video_detect_force_native, | |
3b6740bd | 396 | /* ASUSTeK COMPUTER INC. GA401 */ |
2dfbacc6 LJ |
397 | .matches = { |
398 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
399 | DMI_MATCH(DMI_PRODUCT_NAME, "GA401"), | |
400 | }, | |
401 | }, | |
402 | { | |
403 | .callback = video_detect_force_native, | |
3b6740bd | 404 | /* ASUSTeK COMPUTER INC. GA502 */ |
2dfbacc6 LJ |
405 | .matches = { |
406 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
407 | DMI_MATCH(DMI_PRODUCT_NAME, "GA502"), | |
408 | }, | |
409 | }, | |
410 | { | |
411 | .callback = video_detect_force_native, | |
3b6740bd | 412 | /* ASUSTeK COMPUTER INC. GA503 */ |
2dfbacc6 LJ |
413 | .matches = { |
414 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), | |
415 | DMI_MATCH(DMI_PRODUCT_NAME, "GA503"), | |
416 | }, | |
417 | }, | |
d21a9162 HG |
418 | |
419 | /* | |
420 | * Desktops which falsely report a backlight and which our heuristics | |
421 | * for this do not catch. | |
422 | */ | |
1f59ab27 AH |
423 | { |
424 | .callback = video_detect_force_none, | |
3b6740bd | 425 | /* Dell OptiPlex 9020M */ |
1f59ab27 AH |
426 | .matches = { |
427 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
428 | DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 9020M"), | |
429 | }, | |
430 | }, | |
d21a9162 HG |
431 | { |
432 | .callback = video_detect_force_none, | |
3b6740bd | 433 | /* MSI MS-7721 */ |
d21a9162 HG |
434 | .matches = { |
435 | DMI_MATCH(DMI_SYS_VENDOR, "MSI"), | |
436 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-7721"), | |
437 | }, | |
438 | }, | |
084940d5 CC |
439 | { }, |
440 | }; | |
441 | ||
7231ed1a HG |
442 | /* This uses a workqueue to avoid various locking ordering issues */ |
443 | static void acpi_video_backlight_notify_work(struct work_struct *work) | |
444 | { | |
445 | if (acpi_video_get_backlight_type() != acpi_backlight_video) | |
446 | acpi_video_unregister_backlight(); | |
447 | } | |
448 | ||
93a291df HG |
449 | static int acpi_video_backlight_notify(struct notifier_block *nb, |
450 | unsigned long val, void *bd) | |
451 | { | |
452 | struct backlight_device *backlight = bd; | |
453 | ||
454 | /* A raw bl registering may change video -> native */ | |
455 | if (backlight->props.type == BACKLIGHT_RAW && | |
7231ed1a HG |
456 | val == BACKLIGHT_REGISTERED) |
457 | schedule_work(&backlight_notify_work); | |
93a291df HG |
458 | |
459 | return NOTIFY_OK; | |
460 | } | |
461 | ||
c3d6de69 | 462 | /* |
87521e16 HG |
463 | * Determine which type of backlight interface to use on this system, |
464 | * First check cmdline, then dmi quirks, then do autodetect. | |
465 | * | |
466 | * The autodetect order is: | |
467 | * 1) Is the acpi-video backlight interface supported -> | |
468 | * no, use a vendor interface | |
469 | * 2) Is this a win8 "ready" BIOS and do we have a native interface -> | |
470 | * yes, use a native interface | |
471 | * 3) Else use the acpi-video interface | |
c3d6de69 | 472 | * |
87521e16 HG |
473 | * Arguably the native on win8 check should be done first, but that would |
474 | * be a behavior change, which may causes issues. | |
c3d6de69 | 475 | */ |
87521e16 | 476 | enum acpi_backlight_type acpi_video_get_backlight_type(void) |
c3d6de69 | 477 | { |
87521e16 HG |
478 | static DEFINE_MUTEX(init_mutex); |
479 | static bool init_done; | |
480 | static long video_caps; | |
084940d5 | 481 | |
87521e16 HG |
482 | /* Parse cmdline, dmi and acpi only once */ |
483 | mutex_lock(&init_mutex); | |
484 | if (!init_done) { | |
485 | acpi_video_parse_cmdline(); | |
084940d5 | 486 | dmi_check_system(video_detect_dmi_table); |
87521e16 | 487 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
2263576c | 488 | ACPI_UINT32_MAX, find_video, NULL, |
87521e16 | 489 | &video_caps, NULL); |
7231ed1a HG |
490 | INIT_WORK(&backlight_notify_work, |
491 | acpi_video_backlight_notify_work); | |
93a291df HG |
492 | backlight_nb.notifier_call = acpi_video_backlight_notify; |
493 | backlight_nb.priority = 0; | |
494 | if (backlight_register_notifier(&backlight_nb) == 0) | |
495 | backlight_notifier_registered = true; | |
87521e16 | 496 | init_done = true; |
c3d6de69 | 497 | } |
87521e16 HG |
498 | mutex_unlock(&init_mutex); |
499 | ||
500 | if (acpi_backlight_cmdline != acpi_backlight_undef) | |
501 | return acpi_backlight_cmdline; | |
502 | ||
503 | if (acpi_backlight_dmi != acpi_backlight_undef) | |
504 | return acpi_backlight_dmi; | |
505 | ||
506 | if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) | |
507 | return acpi_backlight_vendor; | |
508 | ||
01c3664d | 509 | if (acpi_osi_is_win8() && backlight_device_get_by_type(BACKLIGHT_RAW)) |
87521e16 HG |
510 | return acpi_backlight_native; |
511 | ||
512 | return acpi_backlight_video; | |
c3d6de69 | 513 | } |
87521e16 | 514 | EXPORT_SYMBOL(acpi_video_get_backlight_type); |
c3d6de69 | 515 | |
87521e16 HG |
516 | /* |
517 | * Set the preferred backlight interface type based on DMI info. | |
518 | * This function allows DMI blacklists to be implemented by external | |
519 | * platform drivers instead of putting a big blacklist in video_detect.c | |
520 | */ | |
521 | void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) | |
c3d6de69 | 522 | { |
87521e16 | 523 | acpi_backlight_dmi = type; |
5fd677b7 HG |
524 | /* Remove acpi-video backlight interface if it is no longer desired */ |
525 | if (acpi_video_get_backlight_type() != acpi_backlight_video) | |
526 | acpi_video_unregister_backlight(); | |
f838eb5b | 527 | } |
87521e16 | 528 | EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); |
f838eb5b | 529 | |
93a291df HG |
530 | void __exit acpi_video_detect_exit(void) |
531 | { | |
532 | if (backlight_notifier_registered) | |
533 | backlight_unregister_notifier(&backlight_nb); | |
534 | } |