Correct .gbs.conf settings
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / acpi / video_detect.c
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
10  * assigned
11  *
12  * After PCI devices are glued with ACPI devices
13  * acpi_get_pci_dev() can be called to identify ACPI graphics
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
20  * backlight switching supporting driver calls:
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  *
26  * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
27  * sony_acpi,... can take care about backlight brightness.
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
36 #include <linux/export.h>
37 #include <linux/acpi.h>
38 #include <linux/dmi.h>
39 #include <linux/pci.h>
40
41 #include "internal.h"
42
43 #define PREFIX "ACPI: "
44
45 ACPI_MODULE_NAME("video");
46 #define _COMPONENT              ACPI_VIDEO_COMPONENT
47
48 static long acpi_video_support;
49 static bool acpi_video_caps_checked;
50
51 static acpi_status
52 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
53                           void **return_value)
54 {
55         long *cap = context;
56
57         if (acpi_has_method(handle, "_BCM") &&
58             acpi_has_method(handle, "_BCL")) {
59                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
60                                   "support\n"));
61                 *cap |= ACPI_VIDEO_BACKLIGHT;
62                 if (!acpi_has_method(handle, "_BQC"))
63                         printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
64                                 "cannot determine initial brightness\n");
65                 /* We have backlight support, no need to scan further */
66                 return AE_CTRL_TERMINATE;
67         }
68         return 0;
69 }
70
71 /* Returns true if the ACPI object is a video device which can be
72  * handled by video.ko.
73  * The device will get a Linux specific CID added in scan.c to
74  * identify the device as an ACPI graphics device
75  * Be aware that the graphics device may not be physically present
76  * Use acpi_video_get_capabilities() to detect general ACPI video
77  * capabilities of present cards
78  */
79 long acpi_is_video_device(acpi_handle handle)
80 {
81         long video_caps = 0;
82
83         /* Is this device able to support video switching ? */
84         if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
85                 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
86
87         /* Is this device able to retrieve a video ROM ? */
88         if (acpi_has_method(handle, "_ROM"))
89                 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
90
91         /* Is this device able to configure which video head to be POSTed ? */
92         if (acpi_has_method(handle, "_VPO") &&
93             acpi_has_method(handle, "_GPD") &&
94             acpi_has_method(handle, "_SPD"))
95                 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
96
97         /* Only check for backlight functionality if one of the above hit. */
98         if (video_caps)
99                 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
100                                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
101                                     &video_caps, NULL);
102
103         return video_caps;
104 }
105 EXPORT_SYMBOL(acpi_is_video_device);
106
107 static acpi_status
108 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
109 {
110         long *cap = context;
111         struct pci_dev *dev;
112         struct acpi_device *acpi_dev;
113
114         const struct acpi_device_id video_ids[] = {
115                 {ACPI_VIDEO_HID, 0},
116                 {"", 0},
117         };
118         if (acpi_bus_get_device(handle, &acpi_dev))
119                 return AE_OK;
120
121         if (!acpi_match_device_ids(acpi_dev, video_ids)) {
122                 dev = acpi_get_pci_dev(handle);
123                 if (!dev)
124                         return AE_OK;
125                 pci_dev_put(dev);
126                 *cap |= acpi_is_video_device(handle);
127         }
128         return AE_OK;
129 }
130
131 /* Force to use vendor driver when the ACPI device is known to be
132  * buggy */
133 static int video_detect_force_vendor(const struct dmi_system_id *d)
134 {
135         acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
136         return 0;
137 }
138
139 static struct dmi_system_id video_detect_dmi_table[] = {
140         /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
141          * ACPI backlight device is used. This flag will definitively break
142          * the backlight interface (even the vendor interface) untill next
143          * reboot. It's why we should prevent video.ko from being used here
144          * and we can't rely on a later call to acpi_video_unregister().
145          */
146         {
147          .callback = video_detect_force_vendor,
148          .ident = "X360",
149          .matches = {
150                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
151                 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
152                 DMI_MATCH(DMI_BOARD_NAME, "X360"),
153                 },
154         },
155         {
156         .callback = video_detect_force_vendor,
157         .ident = "Asus UL30VT",
158         .matches = {
159                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
160                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
161                 },
162         },
163         {
164         .callback = video_detect_force_vendor,
165         .ident = "Asus UL30A",
166         .matches = {
167                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
168                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
169                 },
170         },
171         { },
172 };
173
174 /*
175  * Returns the video capabilities of a specific ACPI graphics device
176  *
177  * if NULL is passed as argument all ACPI devices are enumerated and
178  * all graphics capabilities of physically present devices are
179  * summarized and returned. This is cached and done only once.
180  */
181 long acpi_video_get_capabilities(acpi_handle graphics_handle)
182 {
183         long caps = 0;
184         struct acpi_device *tmp_dev;
185         acpi_status status;
186
187         if (acpi_video_caps_checked && graphics_handle == NULL)
188                 return acpi_video_support;
189
190         if (!graphics_handle) {
191                 /* Only do the global walk through all graphics devices once */
192                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
193                                     ACPI_UINT32_MAX, find_video, NULL,
194                                     &caps, NULL);
195                 /* There might be boot param flags set already... */
196                 acpi_video_support |= caps;
197                 acpi_video_caps_checked = 1;
198                 /* Add blacklists here. Be careful to use the right *DMI* bits
199                  * to still be able to override logic via boot params, e.g.:
200                  *
201                  *   if (dmi_name_in_vendors("XY")) {
202                  *      acpi_video_support |=
203                  *              ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
204                  *}
205                  */
206
207                 dmi_check_system(video_detect_dmi_table);
208         } else {
209                 status = acpi_bus_get_device(graphics_handle, &tmp_dev);
210                 if (ACPI_FAILURE(status)) {
211                         ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
212                         return 0;
213                 }
214                 acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
215                                     ACPI_UINT32_MAX, find_video, NULL,
216                                     &caps, NULL);
217         }
218         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
219                           graphics_handle ? caps : acpi_video_support,
220                           graphics_handle ? "on device " : "in general",
221                           graphics_handle ? acpi_device_bid(tmp_dev) : ""));
222         return caps;
223 }
224 EXPORT_SYMBOL(acpi_video_get_capabilities);
225
226 static void acpi_video_caps_check(void)
227 {
228         /*
229          * We must check whether the ACPI graphics device is physically plugged
230          * in. Therefore this must be called after binding PCI and ACPI devices
231          */
232         if (!acpi_video_caps_checked)
233                 acpi_video_get_capabilities(NULL);
234 }
235
236 bool acpi_osi_is_win8(void)
237 {
238         return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
239 }
240 EXPORT_SYMBOL(acpi_osi_is_win8);
241
242 /* Promote the vendor interface instead of the generic video module.
243  * This function allow DMI blacklists to be implemented by externals
244  * platform drivers instead of putting a big blacklist in video_detect.c
245  * After calling this function you will probably want to call
246  * acpi_video_unregister() to make sure the video module is not loaded
247  */
248 void acpi_video_dmi_promote_vendor(void)
249 {
250         acpi_video_caps_check();
251         acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
252 }
253 EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
254
255 /* To be called when a driver who previously promoted the vendor
256  * interface */
257 void acpi_video_dmi_demote_vendor(void)
258 {
259         acpi_video_caps_check();
260         acpi_video_support &= ~ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
261 }
262 EXPORT_SYMBOL(acpi_video_dmi_demote_vendor);
263
264 /* Returns true if video.ko can do backlight switching */
265 int acpi_video_backlight_support(void)
266 {
267         acpi_video_caps_check();
268
269         /* First check for boot param -> highest prio */
270         if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
271                 return 0;
272         else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
273                 return 1;
274
275         /* Then check for DMI blacklist -> second highest prio */
276         if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
277                 return 0;
278         else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
279                 return 1;
280
281         /* Then go the default way */
282         return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
283 }
284 EXPORT_SYMBOL(acpi_video_backlight_support);
285
286 /*
287  * Use acpi_backlight=vendor/video to force that backlight switching
288  * is processed by vendor specific acpi drivers or video.ko driver.
289  */
290 static int __init acpi_backlight(char *str)
291 {
292         if (str == NULL || *str == '\0')
293                 return 1;
294         else {
295                 if (!strcmp("vendor", str))
296                         acpi_video_support |=
297                                 ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
298                 if (!strcmp("video", str))
299                         acpi_video_support |=
300                                 ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
301         }
302         return 1;
303 }
304 __setup("acpi_backlight=", acpi_backlight);