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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 TR |
37 | |
38 | ACPI_MODULE_NAME("video"); | |
c3d6de69 TR |
39 | #define _COMPONENT ACPI_VIDEO_COMPONENT |
40 | ||
e7d024c0 HG |
41 | void acpi_video_unregister_backlight(void); |
42 | ||
93a291df HG |
43 | static bool backlight_notifier_registered; |
44 | static struct notifier_block backlight_nb; | |
7231ed1a | 45 | static struct work_struct backlight_notify_work; |
93a291df | 46 | |
87521e16 HG |
47 | static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; |
48 | static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; | |
c3d6de69 | 49 | |
14ca7a47 HG |
50 | static void acpi_video_parse_cmdline(void) |
51 | { | |
52 | if (!strcmp("vendor", acpi_video_backlight_string)) | |
87521e16 | 53 | acpi_backlight_cmdline = acpi_backlight_vendor; |
14ca7a47 | 54 | if (!strcmp("video", acpi_video_backlight_string)) |
87521e16 HG |
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; | |
14ca7a47 HG |
60 | } |
61 | ||
c3d6de69 TR |
62 | static acpi_status |
63 | find_video(acpi_handle handle, u32 lvl, void *context, void **rv) | |
64 | { | |
65 | long *cap = context; | |
1e4cffe7 | 66 | struct pci_dev *dev; |
c3d6de69 TR |
67 | struct acpi_device *acpi_dev; |
68 | ||
4a4f01a6 | 69 | static const struct acpi_device_id video_ids[] = { |
c3d6de69 TR |
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)) { | |
1e4cffe7 | 77 | dev = acpi_get_pci_dev(handle); |
c3d6de69 TR |
78 | if (!dev) |
79 | return AE_OK; | |
1e4cffe7 | 80 | pci_dev_put(dev); |
d4e1a692 | 81 | *cap |= acpi_is_video_device(handle); |
c3d6de69 TR |
82 | } |
83 | return AE_OK; | |
84 | } | |
85 | ||
084940d5 CC |
86 | /* Force to use vendor driver when the ACPI device is known to be |
87 | * buggy */ | |
88 | static int video_detect_force_vendor(const struct dmi_system_id *d) | |
89 | { | |
87521e16 | 90 | acpi_backlight_dmi = acpi_backlight_vendor; |
084940d5 CC |
91 | return 0; |
92 | } | |
93 | ||
3bd6bce3 HG |
94 | static int video_detect_force_video(const struct dmi_system_id *d) |
95 | { | |
96 | acpi_backlight_dmi = acpi_backlight_video; | |
97 | return 0; | |
98 | } | |
99 | ||
100 | static int video_detect_force_native(const struct dmi_system_id *d) | |
101 | { | |
102 | acpi_backlight_dmi = acpi_backlight_native; | |
103 | return 0; | |
104 | } | |
105 | ||
4a4f01a6 | 106 | static const struct dmi_system_id video_detect_dmi_table[] = { |
084940d5 CC |
107 | /* On Samsung X360, the BIOS will set a flag (VDRV) if generic |
108 | * ACPI backlight device is used. This flag will definitively break | |
109 | * the backlight interface (even the vendor interface) untill next | |
110 | * reboot. It's why we should prevent video.ko from being used here | |
111 | * and we can't rely on a later call to acpi_video_unregister(). | |
112 | */ | |
113 | { | |
114 | .callback = video_detect_force_vendor, | |
115 | .ident = "X360", | |
116 | .matches = { | |
117 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
118 | DMI_MATCH(DMI_PRODUCT_NAME, "X360"), | |
119 | DMI_MATCH(DMI_BOARD_NAME, "X360"), | |
120 | }, | |
121 | }, | |
d0c2ce16 LT |
122 | { |
123 | .callback = video_detect_force_vendor, | |
124 | .ident = "Asus UL30VT", | |
125 | .matches = { | |
126 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
127 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), | |
128 | }, | |
129 | }, | |
c8f6d835 BT |
130 | { |
131 | .callback = video_detect_force_vendor, | |
132 | .ident = "Asus UL30A", | |
133 | .matches = { | |
134 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
135 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), | |
136 | }, | |
137 | }, | |
3bd6bce3 HG |
138 | |
139 | /* | |
140 | * These models have a working acpi_video backlight control, and using | |
141 | * native backlight causes a regression where backlight does not work | |
142 | * when userspace is not handling brightness key events. Disable | |
143 | * native_backlight on these to fix this: | |
144 | * https://bugzilla.kernel.org/show_bug.cgi?id=81691 | |
145 | */ | |
146 | { | |
147 | .callback = video_detect_force_video, | |
148 | .ident = "ThinkPad T420", | |
149 | .matches = { | |
150 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
151 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), | |
152 | }, | |
153 | }, | |
154 | { | |
155 | .callback = video_detect_force_video, | |
156 | .ident = "ThinkPad T520", | |
157 | .matches = { | |
158 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
159 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), | |
160 | }, | |
161 | }, | |
162 | { | |
163 | .callback = video_detect_force_video, | |
164 | .ident = "ThinkPad X201s", | |
165 | .matches = { | |
166 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
167 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), | |
168 | }, | |
169 | }, | |
170 | ||
171 | /* The native backlight controls do not work on some older machines */ | |
172 | { | |
173 | /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ | |
174 | .callback = video_detect_force_video, | |
175 | .ident = "HP ENVY 15 Notebook", | |
176 | .matches = { | |
177 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
178 | DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), | |
179 | }, | |
180 | }, | |
181 | { | |
182 | .callback = video_detect_force_video, | |
183 | .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E", | |
184 | .matches = { | |
185 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
186 | DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), | |
187 | }, | |
188 | }, | |
189 | { | |
190 | .callback = video_detect_force_video, | |
191 | .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V", | |
192 | .matches = { | |
193 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
194 | DMI_MATCH(DMI_PRODUCT_NAME, | |
195 | "370R4E/370R4V/370R5E/3570RE/370R5V"), | |
196 | }, | |
197 | }, | |
198 | { | |
199 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ | |
200 | .callback = video_detect_force_video, | |
201 | .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV", | |
202 | .matches = { | |
203 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
204 | DMI_MATCH(DMI_PRODUCT_NAME, | |
205 | "3570R/370R/470R/450R/510R/4450RV"), | |
206 | }, | |
207 | }, | |
208 | { | |
209 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ | |
210 | .callback = video_detect_force_video, | |
211 | .ident = "SAMSUNG 730U3E/740U3E", | |
212 | .matches = { | |
213 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
214 | DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), | |
215 | }, | |
216 | }, | |
217 | { | |
218 | /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ | |
219 | .callback = video_detect_force_video, | |
220 | .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D", | |
221 | .matches = { | |
222 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
223 | DMI_MATCH(DMI_PRODUCT_NAME, | |
224 | "900X3C/900X3D/900X3E/900X4C/900X4D"), | |
225 | }, | |
226 | }, | |
61f9738d HG |
227 | { |
228 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */ | |
229 | .callback = video_detect_force_video, | |
230 | .ident = "Dell XPS14 L421X", | |
231 | .matches = { | |
232 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
233 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"), | |
234 | }, | |
235 | }, | |
3bd6bce3 HG |
236 | { |
237 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ | |
238 | .callback = video_detect_force_video, | |
239 | .ident = "Dell XPS15 L521X", | |
240 | .matches = { | |
241 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
242 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), | |
243 | }, | |
244 | }, | |
49eb5208 AL |
245 | { |
246 | /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */ | |
247 | .callback = video_detect_force_video, | |
248 | .ident = "SAMSUNG 530U4E/540U4E", | |
249 | .matches = { | |
250 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
251 | DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), | |
252 | }, | |
253 | }, | |
3bd6bce3 HG |
254 | |
255 | /* Non win8 machines which need native backlight nevertheless */ | |
584d8d1e HG |
256 | { |
257 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */ | |
258 | .callback = video_detect_force_native, | |
259 | .ident = "Lenovo Ideapad S405", | |
260 | .matches = { | |
261 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
262 | DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"), | |
263 | }, | |
264 | }, | |
3bd6bce3 HG |
265 | { |
266 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ | |
267 | .callback = video_detect_force_native, | |
268 | .ident = "Lenovo Ideapad Z570", | |
269 | .matches = { | |
270 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
271 | DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), | |
272 | }, | |
273 | }, | |
274 | { | |
275 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ | |
276 | .callback = video_detect_force_native, | |
277 | .ident = "Apple MacBook Pro 12,1", | |
278 | .matches = { | |
279 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
280 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), | |
281 | }, | |
282 | }, | |
4b4b3b20 HG |
283 | { |
284 | .callback = video_detect_force_native, | |
285 | .ident = "Dell Vostro V131", | |
286 | .matches = { | |
287 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
288 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), | |
289 | }, | |
290 | }, | |
084940d5 CC |
291 | { }, |
292 | }; | |
293 | ||
7231ed1a HG |
294 | /* This uses a workqueue to avoid various locking ordering issues */ |
295 | static void acpi_video_backlight_notify_work(struct work_struct *work) | |
296 | { | |
297 | if (acpi_video_get_backlight_type() != acpi_backlight_video) | |
298 | acpi_video_unregister_backlight(); | |
299 | } | |
300 | ||
93a291df HG |
301 | static int acpi_video_backlight_notify(struct notifier_block *nb, |
302 | unsigned long val, void *bd) | |
303 | { | |
304 | struct backlight_device *backlight = bd; | |
305 | ||
306 | /* A raw bl registering may change video -> native */ | |
307 | if (backlight->props.type == BACKLIGHT_RAW && | |
7231ed1a HG |
308 | val == BACKLIGHT_REGISTERED) |
309 | schedule_work(&backlight_notify_work); | |
93a291df HG |
310 | |
311 | return NOTIFY_OK; | |
312 | } | |
313 | ||
c3d6de69 | 314 | /* |
87521e16 HG |
315 | * Determine which type of backlight interface to use on this system, |
316 | * First check cmdline, then dmi quirks, then do autodetect. | |
317 | * | |
318 | * The autodetect order is: | |
319 | * 1) Is the acpi-video backlight interface supported -> | |
320 | * no, use a vendor interface | |
321 | * 2) Is this a win8 "ready" BIOS and do we have a native interface -> | |
322 | * yes, use a native interface | |
323 | * 3) Else use the acpi-video interface | |
c3d6de69 | 324 | * |
87521e16 HG |
325 | * Arguably the native on win8 check should be done first, but that would |
326 | * be a behavior change, which may causes issues. | |
c3d6de69 | 327 | */ |
87521e16 | 328 | enum acpi_backlight_type acpi_video_get_backlight_type(void) |
c3d6de69 | 329 | { |
87521e16 HG |
330 | static DEFINE_MUTEX(init_mutex); |
331 | static bool init_done; | |
332 | static long video_caps; | |
084940d5 | 333 | |
87521e16 HG |
334 | /* Parse cmdline, dmi and acpi only once */ |
335 | mutex_lock(&init_mutex); | |
336 | if (!init_done) { | |
337 | acpi_video_parse_cmdline(); | |
084940d5 | 338 | dmi_check_system(video_detect_dmi_table); |
87521e16 | 339 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
2263576c | 340 | ACPI_UINT32_MAX, find_video, NULL, |
87521e16 | 341 | &video_caps, NULL); |
7231ed1a HG |
342 | INIT_WORK(&backlight_notify_work, |
343 | acpi_video_backlight_notify_work); | |
93a291df HG |
344 | backlight_nb.notifier_call = acpi_video_backlight_notify; |
345 | backlight_nb.priority = 0; | |
346 | if (backlight_register_notifier(&backlight_nb) == 0) | |
347 | backlight_notifier_registered = true; | |
87521e16 | 348 | init_done = true; |
c3d6de69 | 349 | } |
87521e16 HG |
350 | mutex_unlock(&init_mutex); |
351 | ||
352 | if (acpi_backlight_cmdline != acpi_backlight_undef) | |
353 | return acpi_backlight_cmdline; | |
354 | ||
355 | if (acpi_backlight_dmi != acpi_backlight_undef) | |
356 | return acpi_backlight_dmi; | |
357 | ||
358 | if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) | |
359 | return acpi_backlight_vendor; | |
360 | ||
361 | if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW)) | |
362 | return acpi_backlight_native; | |
363 | ||
364 | return acpi_backlight_video; | |
c3d6de69 | 365 | } |
87521e16 | 366 | EXPORT_SYMBOL(acpi_video_get_backlight_type); |
c3d6de69 | 367 | |
87521e16 HG |
368 | /* |
369 | * Set the preferred backlight interface type based on DMI info. | |
370 | * This function allows DMI blacklists to be implemented by external | |
371 | * platform drivers instead of putting a big blacklist in video_detect.c | |
372 | */ | |
373 | void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) | |
c3d6de69 | 374 | { |
87521e16 | 375 | acpi_backlight_dmi = type; |
5fd677b7 HG |
376 | /* Remove acpi-video backlight interface if it is no longer desired */ |
377 | if (acpi_video_get_backlight_type() != acpi_backlight_video) | |
378 | acpi_video_unregister_backlight(); | |
f838eb5b | 379 | } |
87521e16 | 380 | EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); |
f838eb5b | 381 | |
93a291df HG |
382 | void __exit acpi_video_detect_exit(void) |
383 | { | |
384 | if (backlight_notifier_registered) | |
385 | backlight_unregister_notifier(&backlight_nb); | |
386 | } |