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c3d6de69 TR |
1 | /* |
2 | * Copyright (C) 2008 SuSE Linux Products GmbH | |
3 | * Thomas Renninger <trenn@suse.de> | |
4 | * | |
5 | * May be copied or modified under the terms of the GNU General Public License | |
6 | * | |
7 | * video_detect.c: | |
8 | * Provides acpi_is_video_device() for early scanning of ACPI devices in scan.c | |
9 | * There a Linux specific (Spec does not provide a HID for video devices) is | |
94e2bd68 | 10 | * assigned |
c3d6de69 TR |
11 | * |
12 | * After PCI devices are glued with ACPI devices | |
1e4cffe7 | 13 | * acpi_get_pci_dev() can be called to identify ACPI graphics |
c3d6de69 TR |
14 | * devices for which a real graphics card is plugged in |
15 | * | |
16 | * Now acpi_video_get_capabilities() can be called to check which | |
17 | * capabilities the graphics cards plugged in support. The check for general | |
18 | * video capabilities will be triggered by the first caller of | |
19 | * acpi_video_get_capabilities(NULL); which will happen when the first | |
677bd810 | 20 | * backlight switching supporting driver calls: |
c3d6de69 TR |
21 | * acpi_video_backlight_support(); |
22 | * | |
23 | * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B) | |
24 | * are available, video.ko should be used to handle the device. | |
25 | * | |
7ec48ced | 26 | * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop, |
677bd810 | 27 | * sony_acpi,... can take care about backlight brightness. |
c3d6de69 TR |
28 | * |
29 | * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m) | |
30 | * this file will not be compiled, acpi_video_get_capabilities() and | |
31 | * acpi_video_backlight_support() will always return 0 and vendor specific | |
32 | * drivers always can handle backlight. | |
33 | * | |
34 | */ | |
35 | ||
214f2c90 | 36 | #include <linux/export.h> |
c3d6de69 TR |
37 | #include <linux/acpi.h> |
38 | #include <linux/dmi.h> | |
1e4cffe7 | 39 | #include <linux/pci.h> |
c3d6de69 | 40 | |
a192a958 LB |
41 | #define PREFIX "ACPI: " |
42 | ||
c3d6de69 | 43 | ACPI_MODULE_NAME("video"); |
c3d6de69 TR |
44 | #define _COMPONENT ACPI_VIDEO_COMPONENT |
45 | ||
46 | static long acpi_video_support; | |
47 | static bool acpi_video_caps_checked; | |
48 | ||
49 | static acpi_status | |
50 | acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, | |
51 | void **retyurn_value) | |
52 | { | |
53 | long *cap = context; | |
54 | acpi_handle h_dummy; | |
55 | ||
56 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_BCM", &h_dummy)) && | |
57 | ACPI_SUCCESS(acpi_get_handle(handle, "_BCL", &h_dummy))) { | |
58 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " | |
59 | "support\n")); | |
60 | *cap |= ACPI_VIDEO_BACKLIGHT; | |
98758faf | 61 | if (ACPI_FAILURE(acpi_get_handle(handle, "_BQC", &h_dummy))) |
e9f74c48 ZR |
62 | printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, " |
63 | "cannot determine initial brightness\n"); | |
c3d6de69 TR |
64 | /* We have backlight support, no need to scan further */ |
65 | return AE_CTRL_TERMINATE; | |
66 | } | |
67 | return 0; | |
68 | } | |
69 | ||
70 | /* Returns true if the device is a video device which can be handled by | |
71 | * video.ko. | |
72 | * The device will get a Linux specific CID added in scan.c to | |
73 | * identify the device as an ACPI graphics device | |
74 | * Be aware that the graphics device may not be physically present | |
75 | * Use acpi_video_get_capabilities() to detect general ACPI video | |
76 | * capabilities of present cards | |
77 | */ | |
78 | long acpi_is_video_device(struct acpi_device *device) | |
79 | { | |
80 | acpi_handle h_dummy; | |
81 | long video_caps = 0; | |
82 | ||
83 | if (!device) | |
84 | return 0; | |
85 | ||
ed764e7c MK |
86 | /* Is this device able to support video switching ? */ |
87 | if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) || | |
88 | ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy))) | |
89 | video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; | |
90 | ||
94e2bd68 | 91 | /* Is this device able to retrieve a video ROM ? */ |
c3d6de69 TR |
92 | if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy))) |
93 | video_caps |= ACPI_VIDEO_ROM_AVAILABLE; | |
94 | ||
94e2bd68 | 95 | /* Is this device able to configure which video head to be POSTed ? */ |
c3d6de69 TR |
96 | if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) && |
97 | ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) && | |
98 | ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy))) | |
99 | video_caps |= ACPI_VIDEO_DEVICE_POSTING; | |
100 | ||
101 | /* Only check for backlight functionality if one of the above hit. */ | |
102 | if (video_caps) | |
103 | acpi_walk_namespace(ACPI_TYPE_DEVICE, device->handle, | |
2263576c | 104 | ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, |
c3d6de69 TR |
105 | &video_caps, NULL); |
106 | ||
107 | return video_caps; | |
108 | } | |
109 | EXPORT_SYMBOL(acpi_is_video_device); | |
110 | ||
111 | static acpi_status | |
112 | find_video(acpi_handle handle, u32 lvl, void *context, void **rv) | |
113 | { | |
114 | long *cap = context; | |
1e4cffe7 | 115 | struct pci_dev *dev; |
c3d6de69 TR |
116 | struct acpi_device *acpi_dev; |
117 | ||
118 | const struct acpi_device_id video_ids[] = { | |
119 | {ACPI_VIDEO_HID, 0}, | |
120 | {"", 0}, | |
121 | }; | |
122 | if (acpi_bus_get_device(handle, &acpi_dev)) | |
123 | return AE_OK; | |
124 | ||
125 | if (!acpi_match_device_ids(acpi_dev, video_ids)) { | |
1e4cffe7 | 126 | dev = acpi_get_pci_dev(handle); |
c3d6de69 TR |
127 | if (!dev) |
128 | return AE_OK; | |
1e4cffe7 | 129 | pci_dev_put(dev); |
c3d6de69 TR |
130 | *cap |= acpi_is_video_device(acpi_dev); |
131 | } | |
132 | return AE_OK; | |
133 | } | |
134 | ||
084940d5 CC |
135 | /* Force to use vendor driver when the ACPI device is known to be |
136 | * buggy */ | |
137 | static int video_detect_force_vendor(const struct dmi_system_id *d) | |
138 | { | |
139 | acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static struct dmi_system_id video_detect_dmi_table[] = { | |
144 | /* On Samsung X360, the BIOS will set a flag (VDRV) if generic | |
145 | * ACPI backlight device is used. This flag will definitively break | |
146 | * the backlight interface (even the vendor interface) untill next | |
147 | * reboot. It's why we should prevent video.ko from being used here | |
148 | * and we can't rely on a later call to acpi_video_unregister(). | |
149 | */ | |
150 | { | |
151 | .callback = video_detect_force_vendor, | |
152 | .ident = "X360", | |
153 | .matches = { | |
154 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), | |
155 | DMI_MATCH(DMI_PRODUCT_NAME, "X360"), | |
156 | DMI_MATCH(DMI_BOARD_NAME, "X360"), | |
157 | }, | |
158 | }, | |
159 | { }, | |
160 | }; | |
161 | ||
c3d6de69 TR |
162 | /* |
163 | * Returns the video capabilities of a specific ACPI graphics device | |
164 | * | |
165 | * if NULL is passed as argument all ACPI devices are enumerated and | |
166 | * all graphics capabilities of physically present devices are | |
94e2bd68 | 167 | * summarized and returned. This is cached and done only once. |
c3d6de69 TR |
168 | */ |
169 | long acpi_video_get_capabilities(acpi_handle graphics_handle) | |
170 | { | |
171 | long caps = 0; | |
172 | struct acpi_device *tmp_dev; | |
173 | acpi_status status; | |
174 | ||
175 | if (acpi_video_caps_checked && graphics_handle == NULL) | |
176 | return acpi_video_support; | |
177 | ||
178 | if (!graphics_handle) { | |
179 | /* Only do the global walk through all graphics devices once */ | |
180 | acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | |
2263576c | 181 | ACPI_UINT32_MAX, find_video, NULL, |
c3d6de69 TR |
182 | &caps, NULL); |
183 | /* There might be boot param flags set already... */ | |
184 | acpi_video_support |= caps; | |
185 | acpi_video_caps_checked = 1; | |
186 | /* Add blacklists here. Be careful to use the right *DMI* bits | |
187 | * to still be able to override logic via boot params, e.g.: | |
188 | * | |
189 | * if (dmi_name_in_vendors("XY")) { | |
190 | * acpi_video_support |= | |
c3d6de69 TR |
191 | * ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; |
192 | *} | |
193 | */ | |
084940d5 CC |
194 | |
195 | dmi_check_system(video_detect_dmi_table); | |
c3d6de69 TR |
196 | } else { |
197 | status = acpi_bus_get_device(graphics_handle, &tmp_dev); | |
198 | if (ACPI_FAILURE(status)) { | |
199 | ACPI_EXCEPTION((AE_INFO, status, "Invalid device")); | |
200 | return 0; | |
201 | } | |
202 | acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle, | |
2263576c | 203 | ACPI_UINT32_MAX, find_video, NULL, |
c3d6de69 TR |
204 | &caps, NULL); |
205 | } | |
206 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n", | |
207 | graphics_handle ? caps : acpi_video_support, | |
208 | graphics_handle ? "on device " : "in general", | |
209 | graphics_handle ? acpi_device_bid(tmp_dev) : "")); | |
210 | return caps; | |
211 | } | |
212 | EXPORT_SYMBOL(acpi_video_get_capabilities); | |
213 | ||
f838eb5b | 214 | static void acpi_video_caps_check(void) |
c3d6de69 TR |
215 | { |
216 | /* | |
217 | * We must check whether the ACPI graphics device is physically plugged | |
218 | * in. Therefore this must be called after binding PCI and ACPI devices | |
219 | */ | |
220 | if (!acpi_video_caps_checked) | |
221 | acpi_video_get_capabilities(NULL); | |
f838eb5b CC |
222 | } |
223 | ||
224 | /* Promote the vendor interface instead of the generic video module. | |
225 | * This function allow DMI blacklists to be implemented by externals | |
226 | * platform drivers instead of putting a big blacklist in video_detect.c | |
227 | * After calling this function you will probably want to call | |
228 | * acpi_video_unregister() to make sure the video module is not loaded | |
229 | */ | |
230 | void acpi_video_dmi_promote_vendor(void) | |
231 | { | |
232 | acpi_video_caps_check(); | |
233 | acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; | |
234 | } | |
235 | EXPORT_SYMBOL(acpi_video_dmi_promote_vendor); | |
236 | ||
237 | /* To be called when a driver who previously promoted the vendor | |
238 | * interface */ | |
239 | void acpi_video_dmi_demote_vendor(void) | |
240 | { | |
241 | acpi_video_caps_check(); | |
242 | acpi_video_support &= ~ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; | |
243 | } | |
244 | EXPORT_SYMBOL(acpi_video_dmi_demote_vendor); | |
245 | ||
246 | /* Returns true if video.ko can do backlight switching */ | |
247 | int acpi_video_backlight_support(void) | |
248 | { | |
249 | acpi_video_caps_check(); | |
c3d6de69 TR |
250 | |
251 | /* First check for boot param -> highest prio */ | |
252 | if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR) | |
253 | return 0; | |
254 | else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO) | |
255 | return 1; | |
256 | ||
257 | /* Then check for DMI blacklist -> second highest prio */ | |
258 | if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR) | |
259 | return 0; | |
260 | else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO) | |
261 | return 1; | |
262 | ||
263 | /* Then go the default way */ | |
264 | return acpi_video_support & ACPI_VIDEO_BACKLIGHT; | |
265 | } | |
266 | EXPORT_SYMBOL(acpi_video_backlight_support); | |
267 | ||
268 | /* | |
677bd810 ZR |
269 | * Use acpi_backlight=vendor/video to force that backlight switching |
270 | * is processed by vendor specific acpi drivers or video.ko driver. | |
c3d6de69 | 271 | */ |
8a383ef0 | 272 | static int __init acpi_backlight(char *str) |
c3d6de69 TR |
273 | { |
274 | if (str == NULL || *str == '\0') | |
275 | return 1; | |
276 | else { | |
277 | if (!strcmp("vendor", str)) | |
278 | acpi_video_support |= | |
279 | ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR; | |
280 | if (!strcmp("video", str)) | |
281 | acpi_video_support |= | |
eeb4bcb4 | 282 | ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO; |
c3d6de69 TR |
283 | } |
284 | return 1; | |
285 | } | |
286 | __setup("acpi_backlight=", acpi_backlight); |