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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;
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;
Zhang Rui98758fa2009-03-12 16:57:11 +080061 if (ACPI_FAILURE(acpi_get_handle(handle, "_BQC", &h_dummy)))
Zhang Ruie9f74c42010-09-03 10:08:50 +080062 printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "
63 "cannot determine initial brightness\n");
Thomas Renningerc3d6de62008-08-01 17:37:55 +020064 /* We have backlight support, no need to scan further */
65 return AE_CTRL_TERMINATE;
66 }
67 return 0;
68}
69
Toshi Kanid4e1a692013-03-04 21:30:41 +000070/* Returns true if the ACPI object is a video device which can be
71 * handled by video.ko.
Thomas Renningerc3d6de62008-08-01 17:37:55 +020072 * 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 */
Toshi Kanid4e1a692013-03-04 21:30:41 +000078long acpi_is_video_device(acpi_handle handle)
Thomas Renningerc3d6de62008-08-01 17:37:55 +020079{
80 acpi_handle h_dummy;
81 long video_caps = 0;
82
Michael Karchered764e72011-02-12 01:40:16 +010083 /* Is this device able to support video switching ? */
Toshi Kanid4e1a692013-03-04 21:30:41 +000084 if (ACPI_SUCCESS(acpi_get_handle(handle, "_DOD", &h_dummy)) ||
85 ACPI_SUCCESS(acpi_get_handle(handle, "_DOS", &h_dummy)))
Michael Karchered764e72011-02-12 01:40:16 +010086 video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
87
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +020088 /* Is this device able to retrieve a video ROM ? */
Toshi Kanid4e1a692013-03-04 21:30:41 +000089 if (ACPI_SUCCESS(acpi_get_handle(handle, "_ROM", &h_dummy)))
Thomas Renningerc3d6de62008-08-01 17:37:55 +020090 video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
91
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +020092 /* Is this device able to configure which video head to be POSTed ? */
Toshi Kanid4e1a692013-03-04 21:30:41 +000093 if (ACPI_SUCCESS(acpi_get_handle(handle, "_VPO", &h_dummy)) &&
94 ACPI_SUCCESS(acpi_get_handle(handle, "_GPD", &h_dummy)) &&
95 ACPI_SUCCESS(acpi_get_handle(handle, "_SPD", &h_dummy)))
Thomas Renningerc3d6de62008-08-01 17:37:55 +020096 video_caps |= ACPI_VIDEO_DEVICE_POSTING;
97
98 /* Only check for backlight functionality if one of the above hit. */
99 if (video_caps)
Toshi Kanid4e1a692013-03-04 21:30:41 +0000100 acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
Lin Ming22635762009-11-13 10:06:08 +0800101 ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200102 &video_caps, NULL);
103
104 return video_caps;
105}
106EXPORT_SYMBOL(acpi_is_video_device);
107
108static acpi_status
109find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
110{
111 long *cap = context;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000112 struct pci_dev *dev;
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200113 struct acpi_device *acpi_dev;
114
115 const struct acpi_device_id video_ids[] = {
116 {ACPI_VIDEO_HID, 0},
117 {"", 0},
118 };
119 if (acpi_bus_get_device(handle, &acpi_dev))
120 return AE_OK;
121
122 if (!acpi_match_device_ids(acpi_dev, video_ids)) {
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000123 dev = acpi_get_pci_dev(handle);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200124 if (!dev)
125 return AE_OK;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000126 pci_dev_put(dev);
Toshi Kanid4e1a692013-03-04 21:30:41 +0000127 *cap |= acpi_is_video_device(handle);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200128 }
129 return AE_OK;
130}
131
Corentin Chary084940d2012-06-13 09:32:04 +0200132/* Force to use vendor driver when the ACPI device is known to be
133 * buggy */
134static int video_detect_force_vendor(const struct dmi_system_id *d)
135{
136 acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
137 return 0;
138}
139
140static struct dmi_system_id video_detect_dmi_table[] = {
141 /* On Samsung X360, the BIOS will set a flag (VDRV) if generic
142 * ACPI backlight device is used. This flag will definitively break
143 * the backlight interface (even the vendor interface) untill next
144 * reboot. It's why we should prevent video.ko from being used here
145 * and we can't rely on a later call to acpi_video_unregister().
146 */
147 {
148 .callback = video_detect_force_vendor,
149 .ident = "X360",
150 .matches = {
151 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
152 DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
153 DMI_MATCH(DMI_BOARD_NAME, "X360"),
154 },
155 },
Lan Tianyud0c2ce12012-11-30 13:02:50 +0100156 {
157 .callback = video_detect_force_vendor,
158 .ident = "Asus UL30VT",
159 .matches = {
160 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
161 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
162 },
163 },
Corentin Chary084940d2012-06-13 09:32:04 +0200164 { },
165};
166
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200167/*
168 * Returns the video capabilities of a specific ACPI graphics device
169 *
170 * if NULL is passed as argument all ACPI devices are enumerated and
171 * all graphics capabilities of physically present devices are
Thadeu Lima de Souza Cascardo94e2bd62009-10-16 15:20:49 +0200172 * summarized and returned. This is cached and done only once.
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200173 */
174long acpi_video_get_capabilities(acpi_handle graphics_handle)
175{
176 long caps = 0;
177 struct acpi_device *tmp_dev;
178 acpi_status status;
179
180 if (acpi_video_caps_checked && graphics_handle == NULL)
181 return acpi_video_support;
182
183 if (!graphics_handle) {
184 /* Only do the global walk through all graphics devices once */
185 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
Lin Ming22635762009-11-13 10:06:08 +0800186 ACPI_UINT32_MAX, find_video, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200187 &caps, NULL);
188 /* There might be boot param flags set already... */
189 acpi_video_support |= caps;
190 acpi_video_caps_checked = 1;
191 /* Add blacklists here. Be careful to use the right *DMI* bits
192 * to still be able to override logic via boot params, e.g.:
193 *
194 * if (dmi_name_in_vendors("XY")) {
195 * acpi_video_support |=
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200196 * ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
197 *}
198 */
Corentin Chary084940d2012-06-13 09:32:04 +0200199
200 dmi_check_system(video_detect_dmi_table);
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200201 } else {
202 status = acpi_bus_get_device(graphics_handle, &tmp_dev);
203 if (ACPI_FAILURE(status)) {
204 ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
205 return 0;
206 }
207 acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
Lin Ming22635762009-11-13 10:06:08 +0800208 ACPI_UINT32_MAX, find_video, NULL,
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200209 &caps, NULL);
210 }
211 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
212 graphics_handle ? caps : acpi_video_support,
213 graphics_handle ? "on device " : "in general",
214 graphics_handle ? acpi_device_bid(tmp_dev) : ""));
215 return caps;
216}
217EXPORT_SYMBOL(acpi_video_get_capabilities);
218
Corentin Charyf838eb52012-06-13 09:32:01 +0200219static void acpi_video_caps_check(void)
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200220{
221 /*
222 * We must check whether the ACPI graphics device is physically plugged
223 * in. Therefore this must be called after binding PCI and ACPI devices
224 */
225 if (!acpi_video_caps_checked)
226 acpi_video_get_capabilities(NULL);
Corentin Charyf838eb52012-06-13 09:32:01 +0200227}
228
229/* Promote the vendor interface instead of the generic video module.
230 * This function allow DMI blacklists to be implemented by externals
231 * platform drivers instead of putting a big blacklist in video_detect.c
232 * After calling this function you will probably want to call
233 * acpi_video_unregister() to make sure the video module is not loaded
234 */
235void acpi_video_dmi_promote_vendor(void)
236{
237 acpi_video_caps_check();
238 acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
239}
240EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
241
242/* To be called when a driver who previously promoted the vendor
243 * interface */
244void acpi_video_dmi_demote_vendor(void)
245{
246 acpi_video_caps_check();
247 acpi_video_support &= ~ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
248}
249EXPORT_SYMBOL(acpi_video_dmi_demote_vendor);
250
251/* Returns true if video.ko can do backlight switching */
252int acpi_video_backlight_support(void)
253{
254 acpi_video_caps_check();
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200255
256 /* First check for boot param -> highest prio */
257 if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
258 return 0;
259 else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
260 return 1;
261
262 /* Then check for DMI blacklist -> second highest prio */
263 if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
264 return 0;
265 else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
266 return 1;
267
268 /* Then go the default way */
269 return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
270}
271EXPORT_SYMBOL(acpi_video_backlight_support);
272
273/*
Zhang Rui677bd812010-12-06 15:04:21 +0800274 * Use acpi_backlight=vendor/video to force that backlight switching
275 * is processed by vendor specific acpi drivers or video.ko driver.
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200276 */
Roel Kluin8a383ef2008-12-09 20:45:30 +0100277static int __init acpi_backlight(char *str)
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200278{
279 if (str == NULL || *str == '\0')
280 return 1;
281 else {
282 if (!strcmp("vendor", str))
283 acpi_video_support |=
284 ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
285 if (!strcmp("video", str))
286 acpi_video_support |=
Kamal Mostafaeeb4bcb2010-05-01 12:09:49 -0700287 ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
Thomas Renningerc3d6de62008-08-01 17:37:55 +0200288 }
289 return 1;
290}
291__setup("acpi_backlight=", acpi_backlight);