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 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 | ||
4a4f01a6 | 87 | static const struct dmi_system_id video_detect_dmi_table[] = { |
084940d5 CC |
88 | /* On Samsung X360, the BIOS will set a flag (VDRV) if generic |
89 | * ACPI backlight device is used. This flag will definitively break | |
90 | * the backlight interface (even the vendor interface) untill next | |
91 | * reboot. It's why we should prevent video.ko from being used here | |
92 | * and we can't rely on a later call to acpi_video_unregister(). | |
93 | */ | |
94 | { | |
95 | .callback = video_detect_force_vendor, | |
96 | .ident = "X360", | |
97 | .matches = { | |
98 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
99 | DMI_MATCH(DMI_PRODUCT_NAME, "X360"), | |
100 | DMI_MATCH(DMI_BOARD_NAME, "X360"), | |
101 | }, | |
102 | }, | |
d0c2ce16 LT |
103 | { |
104 | .callback = video_detect_force_vendor, | |
105 | .ident = "Asus UL30VT", | |
106 | .matches = { | |
107 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
108 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"), | |
109 | }, | |
110 | }, | |
c8f6d835 BT |
111 | { |
112 | .callback = video_detect_force_vendor, | |
113 | .ident = "Asus UL30A", | |
114 | .matches = { | |
115 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
116 | DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"), | |
117 | }, | |
118 | }, | |
08a56226 EL |
119 | { |
120 | .callback = video_detect_force_vendor, | |
121 | .ident = "Dell Inspiron 5737", | |
122 | .matches = { | |
123 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
124 | DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5737"), | |
125 | }, | |
126 | }, | |
084940d5 CC |
127 | { }, |
128 | }; | |
129 | ||
c3d6de69 | 130 | /* |
87521e16 HG |
131 | * Determine which type of backlight interface to use on this system, |
132 | * First check cmdline, then dmi quirks, then do autodetect. | |
133 | * | |
134 | * The autodetect order is: | |
135 | * 1) Is the acpi-video backlight interface supported -> | |
136 | * no, use a vendor interface | |
137 | * 2) Is this a win8 "ready" BIOS and do we have a native interface -> | |
138 | * yes, use a native interface | |
139 | * 3) Else use the acpi-video interface | |
c3d6de69 | 140 | * |
87521e16 HG |
141 | * Arguably the native on win8 check should be done first, but that would |
142 | * be a behavior change, which may causes issues. | |
c3d6de69 | 143 | */ |
87521e16 | 144 | enum acpi_backlight_type acpi_video_get_backlight_type(void) |
c3d6de69 | 145 | { |
87521e16 HG |
146 | static DEFINE_MUTEX(init_mutex); |
147 | static bool init_done; | |
148 | static long video_caps; | |
084940d5 | 149 | |
87521e16 HG |
150 | /* Parse cmdline, dmi and acpi only once */ |
151 | mutex_lock(&init_mutex); | |
152 | if (!init_done) { | |
153 | acpi_video_parse_cmdline(); | |
084940d5 | 154 | dmi_check_system(video_detect_dmi_table); |
87521e16 | 155 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
2263576c | 156 | ACPI_UINT32_MAX, find_video, NULL, |
87521e16 HG |
157 | &video_caps, NULL); |
158 | init_done = true; | |
c3d6de69 | 159 | } |
87521e16 HG |
160 | mutex_unlock(&init_mutex); |
161 | ||
162 | if (acpi_backlight_cmdline != acpi_backlight_undef) | |
163 | return acpi_backlight_cmdline; | |
164 | ||
165 | if (acpi_backlight_dmi != acpi_backlight_undef) | |
166 | return acpi_backlight_dmi; | |
167 | ||
168 | if (!(video_caps & ACPI_VIDEO_BACKLIGHT)) | |
169 | return acpi_backlight_vendor; | |
170 | ||
171 | if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW)) | |
172 | return acpi_backlight_native; | |
173 | ||
174 | return acpi_backlight_video; | |
c3d6de69 | 175 | } |
87521e16 | 176 | EXPORT_SYMBOL(acpi_video_get_backlight_type); |
c3d6de69 | 177 | |
87521e16 HG |
178 | /* |
179 | * Set the preferred backlight interface type based on DMI info. | |
180 | * This function allows DMI blacklists to be implemented by external | |
181 | * platform drivers instead of putting a big blacklist in video_detect.c | |
182 | */ | |
183 | void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type) | |
c3d6de69 | 184 | { |
87521e16 | 185 | acpi_backlight_dmi = type; |
f838eb5b | 186 | } |
87521e16 | 187 | EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type); |
f838eb5b | 188 | |
87521e16 HG |
189 | /* |
190 | * Compatiblity function, this is going away as soon as all drivers are | |
191 | * converted to acpi_video_set_dmi_backlight_type(). | |
192 | * | |
193 | * Promote the vendor interface instead of the generic video module. | |
f838eb5b CC |
194 | * After calling this function you will probably want to call |
195 | * acpi_video_unregister() to make sure the video module is not loaded | |
196 | */ | |
197 | void acpi_video_dmi_promote_vendor(void) | |
198 | { | |
87521e16 | 199 | acpi_video_set_dmi_backlight_type(acpi_backlight_vendor); |
f838eb5b CC |
200 | } |
201 | EXPORT_SYMBOL(acpi_video_dmi_promote_vendor); | |
202 | ||
87521e16 HG |
203 | /* |
204 | * Compatiblity function, this is going away as soon as all drivers are | |
205 | * converted to acpi_video_get_backlight_type(). | |
206 | * | |
207 | * Returns true if video.ko can do backlight switching. | |
208 | */ | |
f838eb5b CC |
209 | int acpi_video_backlight_support(void) |
210 | { | |
87521e16 HG |
211 | /* |
212 | * This is done this way since vendor drivers call this to see | |
213 | * if they should load, and we do not want them to load for both | |
214 | * the acpi_backlight_video and acpi_backlight_native cases. | |
215 | */ | |
216 | return acpi_video_get_backlight_type() != acpi_backlight_vendor; | |
c3d6de69 TR |
217 | } |
218 | EXPORT_SYMBOL(acpi_video_backlight_support); |