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