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Thomas Renningerc3d6de62008-08-01 17:37:55 +02001/*
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
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +020010 * assigned
Thomas Renningerc3d6de62008-08-01 17:37:55 +020011 *
12 * After PCI devices are glued with ACPI devices
Alexander Chiang1e4cffe2009-06-10 19:56:00 +000013 * acpi_get_pci_dev() can be called to identify ACPI graphics
Thomas Renningerc3d6de62008-08-01 17:37:55 +020014 * 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
Zhang Rui677bd812010-12-06 15:04:21 +080020 * backlight switching supporting driver calls:
Thomas Renningerc3d6de62008-08-01 17:37:55 +020021 * 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 *
Corentin Chary7ec48ce2011-12-15 08:27:37 +010026 * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
Zhang Rui677bd812010-12-06 15:04:21 +080027 * sony_acpi,... can take care about backlight brightness.
Thomas Renningerc3d6de62008-08-01 17:37:55 +020028 *
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
Paul Gortmaker214f2c92011-10-26 16:22:14 -040036#include <linux/export.h>
Thomas Renningerc3d6de62008-08-01 17:37:55 +020037#include <linux/acpi.h>
38#include <linux/dmi.h>
Alexander Chiang1e4cffe2009-06-10 19:56:00 +000039#include <linux/pci.h>
Thomas Renningerc3d6de62008-08-01 17:37:55 +020040
Rafael J. Wysocki8c5bd7a2013-07-18 02:08:06 +020041#include "internal.h"
42
Len Browna192a952009-07-28 16:45:54 -040043#define PREFIX "ACPI: "
44
Thomas Renningerc3d6de62008-08-01 17:37:55 +020045ACPI_MODULE_NAME("video");
Thomas Renningerc3d6de62008-08-01 17:37:55 +020046#define _COMPONENT ACPI_VIDEO_COMPONENT
47
48static long acpi_video_support;
49static bool acpi_video_caps_checked;
50
51static acpi_status
52acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
53 void **retyurn_value)
54{
55 long *cap = context;
Thomas Renningerc3d6de62008-08-01 17:37:55 +020056
Jiang Liu952c63e2013-06-29 00:24:38 +080057 if (acpi_has_method(handle, "_BCM") &&
58 acpi_has_method(handle, "_BCL")) {
Thomas Renningerc3d6de62008-08-01 17:37:55 +020059 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
60 "support\n"));
61 *cap |= ACPI_VIDEO_BACKLIGHT;
Jiang Liu952c63e2013-06-29 00:24:38 +080062 if (!acpi_has_method(handle, "_BQC"))
Zhang Ruie9f74c42010-09-03 10:08:50 +080063 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
64 "cannot determine initial brightness\n");
Thomas Renningerc3d6de62008-08-01 17:37:55 +020065 /* We have backlight support, no need to scan further */
66 return AE_CTRL_TERMINATE;
67 }
68 return 0;
69}
70
Toshi Kanid4e1a692013-03-04 21:30:41 +000071/* Returns true if the ACPI object is a video device which can be
72 * handled by video.ko.
Thomas Renningerc3d6de62008-08-01 17:37:55 +020073 * 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 */
Toshi Kanid4e1a692013-03-04 21:30:41 +000079long acpi_is_video_device(acpi_handle handle)
Thomas Renningerc3d6de62008-08-01 17:37:55 +020080{
Thomas Renningerc3d6de62008-08-01 17:37:55 +020081 long video_caps = 0;
82
Michael Karchered764e72011-02-12 01:40:16 +010083 /* Is this device able to support video switching ? */
Jiang Liu952c63e2013-06-29 00:24:38 +080084 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
Michael Karchered764e72011-02-12 01:40:16 +010085 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
86
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +020087 /* Is this device able to retrieve a video ROM ? */
Jiang Liu952c63e2013-06-29 00:24:38 +080088 if (acpi_has_method(handle, "_ROM"))
Thomas Renningerc3d6de62008-08-01 17:37:55 +020089 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
90
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +020091 /* Is this device able to configure which video head to be POSTed ? */
Jiang Liu952c63e2013-06-29 00:24:38 +080092 if (acpi_has_method(handle, "_VPO") &&
93 acpi_has_method(handle, "_GPD") &&
94 acpi_has_method(handle, "_SPD"))
Thomas Renningerc3d6de62008-08-01 17:37:55 +020095 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
96
97 /* Only check for backlight functionality if one of the above hit. */
98 if (video_caps)
Toshi Kanid4e1a692013-03-04 21:30:41 +000099 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
Lin Ming22635762009-11-13 10:06:08 +0800100 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200101 &video_caps, NULL);
102
103 return video_caps;
104}
105EXPORT_SYMBOL(acpi_is_video_device);
106
107static acpi_status
108find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
109{
110 long *cap = context;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000111 struct pci_dev *dev;
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200112 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)) {
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000122 dev = acpi_get_pci_dev(handle);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200123 if (!dev)
124 return AE_OK;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000125 pci_dev_put(dev);
Toshi Kanid4e1a692013-03-04 21:30:41 +0000126 *cap |= acpi_is_video_device(handle);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200127 }
128 return AE_OK;
129}
130
Corentin Chary084940d2012-06-13 09:32:04 +0200131/* Force to use vendor driver when the ACPI device is known to be
132 * buggy */
133static 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
139static 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 },
Lan Tianyud0c2ce12012-11-30 13:02:50 +0100155 {
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 },
Bastian Trillerc8f6d832013-05-19 11:52:33 +0000163 {
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 },
Corentin Chary084940d2012-06-13 09:32:04 +0200171 { },
172};
173
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200174/*
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
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +0200179 * summarized and returned. This is cached and done only once.
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200180 */
181long 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,
Lin Ming22635762009-11-13 10:06:08 +0800193 ACPI_UINT32_MAX, find_video, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200194 &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 |=
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200203 * ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
204 *}
205 */
Corentin Chary084940d2012-06-13 09:32:04 +0200206
207 dmi_check_system(video_detect_dmi_table);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200208 } 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,
Lin Ming22635762009-11-13 10:06:08 +0800215 ACPI_UINT32_MAX, find_video, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200216 &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}
224EXPORT_SYMBOL(acpi_video_get_capabilities);
225
Corentin Charyf838eb52012-06-13 09:32:01 +0200226static void acpi_video_caps_check(void)
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200227{
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);
Corentin Charyf838eb52012-06-13 09:32:01 +0200234}
235
Rafael J. Wysocki8c5bd7a2013-07-18 02:08:06 +0200236bool acpi_video_backlight_quirks(void)
237{
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +0200238 return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
Rafael J. Wysocki8c5bd7a2013-07-18 02:08:06 +0200239}
240EXPORT_SYMBOL(acpi_video_backlight_quirks);
241
Corentin Charyf838eb52012-06-13 09:32:01 +0200242/* 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 */
248void acpi_video_dmi_promote_vendor(void)
249{
250 acpi_video_caps_check();
251 acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
252}
253EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
254
255/* To be called when a driver who previously promoted the vendor
256 * interface */
257void acpi_video_dmi_demote_vendor(void)
258{
259 acpi_video_caps_check();
260 acpi_video_support &= ~ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
261}
262EXPORT_SYMBOL(acpi_video_dmi_demote_vendor);
263
264/* Returns true if video.ko can do backlight switching */
265int acpi_video_backlight_support(void)
266{
267 acpi_video_caps_check();
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200268
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}
284EXPORT_SYMBOL(acpi_video_backlight_support);
285
286/*
Zhang Rui677bd812010-12-06 15:04:21 +0800287 * Use acpi_backlight=vendor/video to force that backlight switching
288 * is processed by vendor specific acpi drivers or video.ko driver.
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200289 */
Roel Kluin8a383ef2008-12-09 20:45:30 +0100290static int __init acpi_backlight(char *str)
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200291{
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 |=
Kamal Mostafaeeb4bcb2010-05-01 12:09:49 -0700300 ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200301 }
302 return 1;
303}
304__setup("acpi_backlight=", acpi_backlight);