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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
Len Browna192a952009-07-28 16:45:54 -040041#define PREFIX "ACPI: "
42
Thomas Renningerc3d6de62008-08-01 17:37:55 +020043ACPI_MODULE_NAME("video");
Thomas Renningerc3d6de62008-08-01 17:37:55 +020044#define _COMPONENT ACPI_VIDEO_COMPONENT
45
46static long acpi_video_support;
47static bool acpi_video_caps_checked;
48
49static acpi_status
50acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
51 void **retyurn_value)
52{
53 long *cap = context;
Thomas Renningerc3d6de62008-08-01 17:37:55 +020054
Jiang Liu952c63e2013-06-29 00:24:38 +080055 if (acpi_has_method(handle, "_BCM") &&
56 acpi_has_method(handle, "_BCL")) {
Thomas Renningerc3d6de62008-08-01 17:37:55 +020057 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
58 "support\n"));
59 *cap |= ACPI_VIDEO_BACKLIGHT;
Jiang Liu952c63e2013-06-29 00:24:38 +080060 if (!acpi_has_method(handle, "_BQC"))
Zhang Ruie9f74c42010-09-03 10:08:50 +080061 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
62 "cannot determine initial brightness\n");
Thomas Renningerc3d6de62008-08-01 17:37:55 +020063 /* We have backlight support, no need to scan further */
64 return AE_CTRL_TERMINATE;
65 }
66 return 0;
67}
68
Toshi Kanid4e1a692013-03-04 21:30:41 +000069/* Returns true if the ACPI object is a video device which can be
70 * handled by video.ko.
Thomas Renningerc3d6de62008-08-01 17:37:55 +020071 * The device will get a Linux specific CID added in scan.c to
72 * identify the device as an ACPI graphics device
73 * Be aware that the graphics device may not be physically present
74 * Use acpi_video_get_capabilities() to detect general ACPI video
75 * capabilities of present cards
76 */
Toshi Kanid4e1a692013-03-04 21:30:41 +000077long acpi_is_video_device(acpi_handle handle)
Thomas Renningerc3d6de62008-08-01 17:37:55 +020078{
Thomas Renningerc3d6de62008-08-01 17:37:55 +020079 long video_caps = 0;
80
Michael Karchered764e72011-02-12 01:40:16 +010081 /* Is this device able to support video switching ? */
Jiang Liu952c63e2013-06-29 00:24:38 +080082 if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
Michael Karchered764e72011-02-12 01:40:16 +010083 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
84
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +020085 /* Is this device able to retrieve a video ROM ? */
Jiang Liu952c63e2013-06-29 00:24:38 +080086 if (acpi_has_method(handle, "_ROM"))
Thomas Renningerc3d6de62008-08-01 17:37:55 +020087 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
88
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +020089 /* Is this device able to configure which video head to be POSTed ? */
Jiang Liu952c63e2013-06-29 00:24:38 +080090 if (acpi_has_method(handle, "_VPO") &&
91 acpi_has_method(handle, "_GPD") &&
92 acpi_has_method(handle, "_SPD"))
Thomas Renningerc3d6de62008-08-01 17:37:55 +020093 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
94
95 /* Only check for backlight functionality if one of the above hit. */
96 if (video_caps)
Toshi Kanid4e1a692013-03-04 21:30:41 +000097 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
Lin Ming22635762009-11-13 10:06:08 +080098 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +020099 &video_caps, NULL);
100
101 return video_caps;
102}
103EXPORT_SYMBOL(acpi_is_video_device);
104
105static acpi_status
106find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
107{
108 long *cap = context;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000109 struct pci_dev *dev;
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200110 struct acpi_device *acpi_dev;
111
112 const struct acpi_device_id video_ids[] = {
113 {ACPI_VIDEO_HID, 0},
114 {"", 0},
115 };
116 if (acpi_bus_get_device(handle, &acpi_dev))
117 return AE_OK;
118
119 if (!acpi_match_device_ids(acpi_dev, video_ids)) {
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000120 dev = acpi_get_pci_dev(handle);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200121 if (!dev)
122 return AE_OK;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000123 pci_dev_put(dev);
Toshi Kanid4e1a692013-03-04 21:30:41 +0000124 *cap |= acpi_is_video_device(handle);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200125 }
126 return AE_OK;
127}
128
Corentin Chary084940d2012-06-13 09:32:04 +0200129/* Force to use vendor driver when the ACPI device is known to be
130 * buggy */
131static int video_detect_force_vendor(const struct dmi_system_id *d)
132{
133 acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
134 return 0;
135}
136
137static struct dmi_system_id video_detect_dmi_table[] = {
138 /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
139 * ACPI backlight device is used. This flag will definitively break
140 * the backlight interface (even the vendor interface) untill next
141 * reboot. It's why we should prevent video.ko from being used here
142 * and we can't rely on a later call to acpi_video_unregister().
143 */
144 {
145 .callback = video_detect_force_vendor,
146 .ident = "X360",
147 .matches = {
148 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
149 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
150 DMI_MATCH(DMI_BOARD_NAME, "X360"),
151 },
152 },
Lan Tianyud0c2ce12012-11-30 13:02:50 +0100153 {
154 .callback = video_detect_force_vendor,
155 .ident = "Asus UL30VT",
156 .matches = {
157 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
158 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
159 },
160 },
Bastian Trillerc8f6d832013-05-19 11:52:33 +0000161 {
162 .callback = video_detect_force_vendor,
163 .ident = "Asus UL30A",
164 .matches = {
165 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
166 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
167 },
168 },
Corentin Chary084940d2012-06-13 09:32:04 +0200169 { },
170};
171
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200172/*
173 * Returns the video capabilities of a specific ACPI graphics device
174 *
175 * if NULL is passed as argument all ACPI devices are enumerated and
176 * all graphics capabilities of physically present devices are
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +0200177 * summarized and returned. This is cached and done only once.
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200178 */
179long acpi_video_get_capabilities(acpi_handle graphics_handle)
180{
181 long caps = 0;
182 struct acpi_device *tmp_dev;
183 acpi_status status;
184
185 if (acpi_video_caps_checked && graphics_handle == NULL)
186 return acpi_video_support;
187
188 if (!graphics_handle) {
189 /* Only do the global walk through all graphics devices once */
190 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Lin Ming22635762009-11-13 10:06:08 +0800191 ACPI_UINT32_MAX, find_video, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200192 &caps, NULL);
193 /* There might be boot param flags set already... */
194 acpi_video_support |= caps;
195 acpi_video_caps_checked = 1;
196 /* Add blacklists here. Be careful to use the right *DMI* bits
197 * to still be able to override logic via boot params, e.g.:
198 *
199 * if (dmi_name_in_vendors("XY")) {
200 * acpi_video_support |=
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200201 * ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
202 *}
203 */
Corentin Chary084940d2012-06-13 09:32:04 +0200204
205 dmi_check_system(video_detect_dmi_table);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200206 } else {
207 status = acpi_bus_get_device(graphics_handle, &tmp_dev);
208 if (ACPI_FAILURE(status)) {
209 ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
210 return 0;
211 }
212 acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
Lin Ming22635762009-11-13 10:06:08 +0800213 ACPI_UINT32_MAX, find_video, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200214 &caps, NULL);
215 }
216 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
217 graphics_handle ? caps : acpi_video_support,
218 graphics_handle ? "on device " : "in general",
219 graphics_handle ? acpi_device_bid(tmp_dev) : ""));
220 return caps;
221}
222EXPORT_SYMBOL(acpi_video_get_capabilities);
223
Corentin Charyf838eb52012-06-13 09:32:01 +0200224static void acpi_video_caps_check(void)
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200225{
226 /*
227 * We must check whether the ACPI graphics device is physically plugged
228 * in. Therefore this must be called after binding PCI and ACPI devices
229 */
230 if (!acpi_video_caps_checked)
231 acpi_video_get_capabilities(NULL);
Corentin Charyf838eb52012-06-13 09:32:01 +0200232}
233
234/* Promote the vendor interface instead of the generic video module.
235 * This function allow DMI blacklists to be implemented by externals
236 * platform drivers instead of putting a big blacklist in video_detect.c
237 * After calling this function you will probably want to call
238 * acpi_video_unregister() to make sure the video module is not loaded
239 */
240void acpi_video_dmi_promote_vendor(void)
241{
242 acpi_video_caps_check();
243 acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
244}
245EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
246
247/* To be called when a driver who previously promoted the vendor
248 * interface */
249void acpi_video_dmi_demote_vendor(void)
250{
251 acpi_video_caps_check();
252 acpi_video_support &= ~ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
253}
254EXPORT_SYMBOL(acpi_video_dmi_demote_vendor);
255
256/* Returns true if video.ko can do backlight switching */
257int acpi_video_backlight_support(void)
258{
259 acpi_video_caps_check();
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200260
261 /* First check for boot param -> highest prio */
262 if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
263 return 0;
264 else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
265 return 1;
266
267 /* Then check for DMI blacklist -> second highest prio */
268 if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
269 return 0;
270 else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
271 return 1;
272
273 /* Then go the default way */
274 return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
275}
276EXPORT_SYMBOL(acpi_video_backlight_support);
277
278/*
Zhang Rui677bd812010-12-06 15:04:21 +0800279 * Use acpi_backlight=vendor/video to force that backlight switching
280 * is processed by vendor specific acpi drivers or video.ko driver.
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200281 */
Roel Kluin8a383ef2008-12-09 20:45:30 +0100282static int __init acpi_backlight(char *str)
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200283{
284 if (str == NULL || *str == '\0')
285 return 1;
286 else {
287 if (!strcmp("vendor", str))
288 acpi_video_support |=
289 ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
290 if (!strcmp("video", str))
291 acpi_video_support |=
Kamal Mostafaeeb4bcb2010-05-01 12:09:49 -0700292 ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200293 }
294 return 1;
295}
296__setup("acpi_backlight=", acpi_backlight);