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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 HG |
34 | #include <linux/types.h> |
35 | #include <acpi/video.h> | |
c3d6de69 TR |
36 | |
37 | ACPI_MODULE_NAME("video"); | |
c3d6de69 TR |
38 | #define _COMPONENT ACPI_VIDEO_COMPONENT |
39 | ||
87521e16 HG |
40 | static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; |
41 | static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; | |
c3d6de69 | 42 | |
14ca7a47 HG |
43 | static void acpi_video_parse_cmdline(void) |
44 | { | |
45 | if (!strcmp("vendor", acpi_video_backlight_string)) | |
87521e16 | 46 | acpi_backlight_cmdline = acpi_backlight_vendor; |
14ca7a47 | 47 | if (!strcmp("video", acpi_video_backlight_string)) |
87521e16 HG |
48 | acpi_backlight_cmdline = acpi_backlight_video; |
49 | if (!strcmp("native", acpi_video_backlight_string)) | |
50 | acpi_backlight_cmdline = acpi_backlight_native; | |
51 | if (!strcmp("none", acpi_video_backlight_string)) | |
52 | acpi_backlight_cmdline = acpi_backlight_none; | |
14ca7a47 HG |
53 | } |
54 | ||
c3d6de69 TR |
55 | static acpi_status |
56 | find_video(acpi_handle handle, u32 lvl, void *context, void **rv) | |
57 | { | |
58 | long *cap = context; | |
1e4cffe7 | 59 | struct pci_dev *dev; |
c3d6de69 TR |
60 | struct acpi_device *acpi_dev; |
61 | ||
4a4f01a6 | 62 | static const struct acpi_device_id video_ids[] = { |
c3d6de69 TR |
63 | {ACPI_VIDEO_HID, 0}, |
64 | {"", 0}, | |
65 | }; | |
66 | if (acpi_bus_get_device(handle, &acpi_dev)) | |
67 | return AE_OK; | |
68 | ||
69 | if (!acpi_match_device_ids(acpi_dev, video_ids)) { | |
1e4cffe7 | 70 | dev = acpi_get_pci_dev(handle); |
c3d6de69 TR |
71 | if (!dev) |
72 | return AE_OK; | |
1e4cffe7 | 73 | pci_dev_put(dev); |
d4e1a692 | 74 | *cap |= acpi_is_video_device(handle); |
c3d6de69 TR |
75 | } |
76 | return AE_OK; | |
77 | } | |
78 | ||
084940d5 CC |
79 | /* Force to use vendor driver when the ACPI device is known to be |
80 | * buggy */ | |
81 | static int video_detect_force_vendor(const struct dmi_system_id *d) | |
82 | { | |
87521e16 | 83 | acpi_backlight_dmi = acpi_backlight_vendor; |
084940d5 CC |
84 | return 0; |
85 | } | |
86 | ||
3bd6bce3 HG |
87 | static int video_detect_force_video(const struct dmi_system_id *d) |
88 | { | |
89 | acpi_backlight_dmi = acpi_backlight_video; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | static int video_detect_force_native(const struct dmi_system_id *d) | |
94 | { | |
95 | acpi_backlight_dmi = acpi_backlight_native; | |
96 | return 0; | |
97 | } | |
98 | ||
4a4f01a6 | 99 | static const struct dmi_system_id video_detect_dmi_table[] = { |
084940d5 CC |
100 | /* On Samsung X360, the BIOS will set a flag (VDRV) if generic |
101 | * ACPI backlight device is used. This flag will definitively break | |
102 | * the backlight interface (even the vendor interface) untill next | |
103 | * reboot. It's why we should prevent video.ko from being used here | |
104 | * and we can't rely on a later call to acpi_video_unregister(). | |
105 | */ | |
106 | { | |
107 | .callback = video_detect_force_vendor, | |
108 | .ident = "X360", | |
109 | .matches = { | |
110 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
111 | DMI_MATCH(DMI_PRODUCT_NAME, "X360"), | |
112 | DMI_MATCH(DMI_BOARD_NAME, "X360"), | |
113 | }, | |
114 | }, | |
d0c2ce16 LT |
115 | { |
116 | .callback = video_detect_force_vendor, | |
117 | .ident = "Asus UL30VT", | |
118 | .matches = { | |
119 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
120 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), | |
121 | }, | |
122 | }, | |
c8f6d835 BT |
123 | { |
124 | .callback = video_detect_force_vendor, | |
125 | .ident = "Asus UL30A", | |
126 | .matches = { | |
127 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
128 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), | |
129 | }, | |
130 | }, | |
08a56226 EL |
131 | { |
132 | .callback = video_detect_force_vendor, | |
133 | .ident = "Dell Inspiron 5737", | |
134 | .matches = { | |
135 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
136 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"), | |
137 | }, | |
138 | }, | |
3bd6bce3 HG |
139 | |
140 | /* | |
141 | * These models have a working acpi_video backlight control, and using | |
142 | * native backlight causes a regression where backlight does not work | |
143 | * when userspace is not handling brightness key events. Disable | |
144 | * native_backlight on these to fix this: | |
145 | * https://bugzilla.kernel.org/show_bug.cgi?id=81691 | |
146 | */ | |
147 | { | |
148 | .callback = video_detect_force_video, | |
149 | .ident = "ThinkPad T420", | |
150 | .matches = { | |
151 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
152 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"), | |
153 | }, | |
154 | }, | |
155 | { | |
156 | .callback = video_detect_force_video, | |
157 | .ident = "ThinkPad T520", | |
158 | .matches = { | |
159 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
160 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"), | |
161 | }, | |
162 | }, | |
163 | { | |
164 | .callback = video_detect_force_video, | |
165 | .ident = "ThinkPad X201s", | |
166 | .matches = { | |
167 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
168 | DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"), | |
169 | }, | |
170 | }, | |
171 | ||
172 | /* The native backlight controls do not work on some older machines */ | |
173 | { | |
174 | /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */ | |
175 | .callback = video_detect_force_video, | |
176 | .ident = "HP ENVY 15 Notebook", | |
177 | .matches = { | |
178 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
179 | DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"), | |
180 | }, | |
181 | }, | |
182 | { | |
183 | .callback = video_detect_force_video, | |
184 | .ident = "SAMSUNG 870Z5E/880Z5E/680Z5E", | |
185 | .matches = { | |
186 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
187 | DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"), | |
188 | }, | |
189 | }, | |
190 | { | |
191 | .callback = video_detect_force_video, | |
192 | .ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V", | |
193 | .matches = { | |
194 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
195 | DMI_MATCH(DMI_PRODUCT_NAME, | |
196 | "370R4E/370R4V/370R5E/3570RE/370R5V"), | |
197 | }, | |
198 | }, | |
199 | { | |
200 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */ | |
201 | .callback = video_detect_force_video, | |
202 | .ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV", | |
203 | .matches = { | |
204 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
205 | DMI_MATCH(DMI_PRODUCT_NAME, | |
206 | "3570R/370R/470R/450R/510R/4450RV"), | |
207 | }, | |
208 | }, | |
209 | { | |
210 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */ | |
211 | .callback = video_detect_force_video, | |
212 | .ident = "SAMSUNG 730U3E/740U3E", | |
213 | .matches = { | |
214 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
215 | DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"), | |
216 | }, | |
217 | }, | |
218 | { | |
219 | /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */ | |
220 | .callback = video_detect_force_video, | |
221 | .ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D", | |
222 | .matches = { | |
223 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
224 | DMI_MATCH(DMI_PRODUCT_NAME, | |
225 | "900X3C/900X3D/900X3E/900X4C/900X4D"), | |
226 | }, | |
227 | }, | |
228 | { | |
229 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */ | |
230 | .callback = video_detect_force_video, | |
231 | .ident = "Dell XPS15 L521X", | |
232 | .matches = { | |
233 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
234 | DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"), | |
235 | }, | |
236 | }, | |
237 | ||
238 | /* Non win8 machines which need native backlight nevertheless */ | |
239 | { | |
240 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */ | |
241 | .callback = video_detect_force_native, | |
242 | .ident = "Lenovo Ideapad Z570", | |
243 | .matches = { | |
244 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), | |
245 | DMI_MATCH(DMI_PRODUCT_NAME, "102434U"), | |
246 | }, | |
247 | }, | |
248 | { | |
249 | /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */ | |
250 | .callback = video_detect_force_native, | |
251 | .ident = "Apple MacBook Pro 12,1", | |
252 | .matches = { | |
253 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
254 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"), | |
255 | }, | |
256 | }, | |
084940d5 CC |
257 | { }, |
258 | }; | |
259 | ||
c3d6de69 | 260 | /* |
87521e16 HG |
261 | * Determine which type of backlight interface to use on this system, |
262 | * First check cmdline, then dmi quirks, then do autodetect. | |
263 | * | |
264 | * The autodetect order is: | |
265 | * 1) Is the acpi-video backlight interface supported -> | |
266 | * no, use a vendor interface | |
267 | * 2) Is this a win8 "ready" BIOS and do we have a native interface -> | |
268 | * yes, use a native interface | |
269 | * 3) Else use the acpi-video interface | |
c3d6de69 | 270 | * |
87521e16 HG |
271 | * Arguably the native on win8 check should be done first, but that would |
272 | * be a behavior change, which may causes issues. | |
c3d6de69 | 273 | */ |
87521e16 | 274 | enum acpi_backlight_type acpi_video_get_backlight_type(void) |
c3d6de69 | 275 | { |
87521e16 HG |
276 | static DEFINE_MUTEX(init_mutex); |
277 | static bool init_done; | |
278 | static long video_caps; | |
084940d5 | 279 | |
87521e16 HG |
280 | /* Parse cmdline, dmi and acpi only once */ |
281 | mutex_lock(&init_mutex); | |
282 | if (!init_done) { | |
283 | acpi_video_parse_cmdline(); | |
084940d5 | 284 | dmi_check_system(video_detect_dmi_table); |
87521e16 | 285 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
2263576c | 286 | ACPI_UINT32_MAX, find_video, NULL, |
87521e16 HG |
287 | &video_caps, NULL); |
288 | init_done = true; | |
c3d6de69 | 289 | } |
87521e16 HG |
290 | mutex_unlock(&init_mutex); |
291 | ||
292 | if (acpi_backlight_cmdline != acpi_backlight_undef) | |
293 | return acpi_backlight_cmdline; | |
294 | ||
295 | if (acpi_backlight_dmi != acpi_backlight_undef) | |
296 | return acpi_backlight_dmi; | |
297 | ||
298 | if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) | |
299 | return acpi_backlight_vendor; | |
300 | ||
301 | if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW)) | |
302 | return acpi_backlight_native; | |
303 | ||
304 | return acpi_backlight_video; | |
c3d6de69 | 305 | } |
87521e16 | 306 | EXPORT_SYMBOL(acpi_video_get_backlight_type); |
c3d6de69 | 307 | |
87521e16 HG |
308 | /* |
309 | * Set the preferred backlight interface type based on DMI info. | |
310 | * This function allows DMI blacklists to be implemented by external | |
311 | * platform drivers instead of putting a big blacklist in video_detect.c | |
312 | */ | |
313 | void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) | |
c3d6de69 | 314 | { |
87521e16 | 315 | acpi_backlight_dmi = type; |
5fd677b7 HG |
316 | /* Remove acpi-video backlight interface if it is no longer desired */ |
317 | if (acpi_video_get_backlight_type() != acpi_backlight_video) | |
318 | acpi_video_unregister_backlight(); | |
f838eb5b | 319 | } |
87521e16 | 320 | EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); |
f838eb5b | 321 | |
87521e16 HG |
322 | /* |
323 | * Compatiblity function, this is going away as soon as all drivers are | |
324 | * converted to acpi_video_set_dmi_backlight_type(). | |
325 | * | |
326 | * Promote the vendor interface instead of the generic video module. | |
f838eb5b CC |
327 | * After calling this function you will probably want to call |
328 | * acpi_video_unregister() to make sure the video module is not loaded | |
329 | */ | |
330 | void acpi_video_dmi_promote_vendor(void) | |
331 | { | |
87521e16 | 332 | acpi_video_set_dmi_backlight_type(acpi_backlight_vendor); |
f838eb5b CC |
333 | } |
334 | EXPORT_SYMBOL(acpi_video_dmi_promote_vendor); | |
335 | ||
87521e16 HG |
336 | /* |
337 | * Compatiblity function, this is going away as soon as all drivers are | |
338 | * converted to acpi_video_get_backlight_type(). | |
339 | * | |
340 | * Returns true if video.ko can do backlight switching. | |
341 | */ | |
f838eb5b CC |
342 | int acpi_video_backlight_support(void) |
343 | { | |
87521e16 HG |
344 | /* |
345 | * This is done this way since vendor drivers call this to see | |
346 | * if they should load, and we do not want them to load for both | |
347 | * the acpi_backlight_video and acpi_backlight_native cases. | |
348 | */ | |
349 | return acpi_video_get_backlight_type() != acpi_backlight_vendor; | |
c3d6de69 TR |
350 | } |
351 | EXPORT_SYMBOL(acpi_video_backlight_support); |