Merge branch 'video' into release

Conflicts:
	Documentation/kernel-parameters.txt
Signed-off-by: Len Brown <len.brown@intel.com>

Documentation/kernel-parameters.txt

@@ -198,6 +198,18 @@ and is between 256 and 4096 characters. It is defined in the file
 			that require a timer override, but don't have
 			HPET
 
+	acpi_backlight=	[HW,ACPI]
+			acpi_backlight=vendor
+			acpi_backlight=video
+			If set to vendor, prefer vendor specific driver
+			(e.g. thinkpad_acpi, sony_acpi, etc.) instead
+			of the ACPI video.ko driver.
+
+	acpi_display_output=	[HW,ACPI]
+			acpi_display_output=vendor
+			acpi_display_output=video
+			See above.
+
 	acpi.debug_layer=	[HW,ACPI,ACPI_DEBUG]
 	acpi.debug_level=	[HW,ACPI,ACPI_DEBUG]
 			Format: <int>

drivers/acpi/Makefile

@@ -46,6 +46,10 @@ obj-$(CONFIG_ACPI_BUTTON)	+= button.o
 obj-$(CONFIG_ACPI_FAN)		+= fan.o
 obj-$(CONFIG_ACPI_DOCK)		+= dock.o
 obj-$(CONFIG_ACPI_VIDEO)	+= video.o
+ifdef CONFIG_ACPI_VIDEO
+obj-y				+= video_detect.o
+endif
+
 obj-y				+= pci_root.o pci_link.o pci_irq.o pci_bind.o
 obj-$(CONFIG_ACPI_PCI_SLOT)	+= pci_slot.o
 obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o

drivers/acpi/glue.c

@@ -140,6 +140,46 @@ struct device *acpi_get_physical_device(acpi_handle handle)
 
 EXPORT_SYMBOL(acpi_get_physical_device);
 
+/* ToDo: When a PCI bridge is found, return the PCI device behind the bridge
+ *       This should work in general, but did not on a Lenovo T61 for the
+ *	 graphics card. But this must be fixed when the PCI device is
+ *       bound and the kernel device struct is attached to the acpi device
+ * Note: A success call will increase reference count by one
+ *       Do call put_device(dev) on the returned device then
+ */
+struct device *acpi_get_physical_pci_device(acpi_handle handle)
+{
+	struct device *dev;
+	long long device_id;
+	acpi_status status;
+
+	status =
+		acpi_evaluate_integer(handle, "_ADR", NULL, &device_id);
+
+	if (ACPI_FAILURE(status))
+		return NULL;
+
+	/* We need to attempt to determine whether the _ADR refers to a
+	   PCI device or not. There's no terribly good way to do this,
+	   so the best we can hope for is to assume that there'll never
+	   be a device in the host bridge */
+	if (device_id >= 0x10000) {
+		/* It looks like a PCI device. Does it exist? */
+		dev = acpi_get_physical_device(handle);
+	} else {
+		/* It doesn't look like a PCI device. Does its parent
+		   exist? */
+		acpi_handle phandle;
+		if (acpi_get_parent(handle, &phandle))
+			return NULL;
+		dev = acpi_get_physical_device(phandle);
+	}
+	if (!dev)
+		return NULL;
+	return dev;
+}
+EXPORT_SYMBOL(acpi_get_physical_pci_device);
+
 static int acpi_bind_one(struct device *dev, acpi_handle handle)
 {
 	struct acpi_device *acpi_dev;

drivers/acpi/scan.c

@@ -919,36 +919,6 @@ static void acpi_device_get_busid(struct acpi_device *device,
 	}
 }
 
-static int
-acpi_video_bus_match(struct acpi_device *device)
-{
-	acpi_handle h_dummy;
-
-	if (!device)
-		return -EINVAL;
-
-	/* Since there is no HID, CID for ACPI Video drivers, we have
-	 * to check well known required nodes for each feature we support.
-	 */
-
-	/* Does this device able to support video switching ? */
-	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
-	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
-		return 0;
-
-	/* Does this device able to retrieve a video ROM ? */
-	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
-		return 0;
-
-	/* Does this device able to configure which video head to be POSTed ? */
-	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
-	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
-	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
-		return 0;
-
-	return -ENODEV;
-}
-
 /*
  * acpi_bay_match - see if a device is an ejectable driver bay
  *
@@ -1031,7 +1001,7 @@ static void acpi_device_set_id(struct acpi_device *device,
 		   will get autoloaded and the device might still match
 		   against another driver.
 		*/
-		if (ACPI_SUCCESS(acpi_video_bus_match(device)))
+		if (acpi_is_video_device(device))
 			cid_add = ACPI_VIDEO_HID;
 		else if (ACPI_SUCCESS(acpi_bay_match(device)))
 			cid_add = ACPI_BAY_HID;

drivers/acpi/video.c

@@ -738,6 +738,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 		device->cap._DSS = 1;
 	}
 
+	if (acpi_video_backlight_support())
 		max_level = acpi_video_init_brightness(device);
 
 	if (device->cap._BCL && device->cap._BCM && max_level > 0) {
@@ -784,8 +785,11 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 			printk(KERN_ERR PREFIX "Create sysfs link\n");
 
 	}
-	if (device->cap._DCS && device->cap._DSS){
-		static int count = 0;
+
+	if (acpi_video_display_switch_support()) {
+
+		if (device->cap._DCS && device->cap._DSS) {
+			static int count;
 			char *name;
 			name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
 			if (!name)
@@ -795,7 +799,7 @@ static void acpi_video_device_find_cap(struct acpi_video_device *device)
 					NULL, device, &acpi_output_properties);
 			kfree(name);
 		}
-	return;
+	}
 }
 
 /*
@@ -841,11 +845,16 @@ static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
 static int acpi_video_bus_check(struct acpi_video_bus *video)
 {
 	acpi_status status = -ENOENT;
-
+	struct device *dev;
 
 	if (!video)
 		return -EINVAL;
 
+	dev = acpi_get_physical_pci_device(video->device->handle);
+	if (!dev)
+		return -ENODEV;
+	put_device(dev);
+
 	/* Since there is no HID, CID and so on for VGA driver, we have
 	 * to check well known required nodes.
 	 */

drivers/acpi/video_detect.c

+/*
+ *  Copyright (C) 2008       SuSE Linux Products GmbH
+ *                           Thomas Renninger <trenn@suse.de>
+ *
+ *  May be copied or modified under the terms of the GNU General Public License
+ *
+ * video_detect.c:
+ * Provides acpi_is_video_device() for early scanning of ACPI devices in scan.c
+ * There a Linux specific (Spec does not provide a HID for video devices) is
+ * assinged
+ *
+ * After PCI devices are glued with ACPI devices
+ * acpi_get_physical_pci_device() can be called to identify ACPI graphics
+ * devices for which a real graphics card is plugged in
+ *
+ * Now acpi_video_get_capabilities() can be called to check which
+ * capabilities the graphics cards plugged in support. The check for general
+ * video capabilities will be triggered by the first caller of
+ * acpi_video_get_capabilities(NULL); which will happen when the first
+ * backlight (or display output) switching supporting driver calls:
+ * acpi_video_backlight_support();
+ *
+ * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
+ * are available, video.ko should be used to handle the device.
+ *
+ * Otherwise vendor specific drivers like thinkpad_acpi, asus_acpi,
+ * sony_acpi,... can take care about backlight brightness and display output
+ * switching.
+ *
+ * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
+ * this file will not be compiled, acpi_video_get_capabilities() and
+ * acpi_video_backlight_support() will always return 0 and vendor specific
+ * drivers always can handle backlight.
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+
+ACPI_MODULE_NAME("video");
+#define _COMPONENT		ACPI_VIDEO_COMPONENT
+
+static long acpi_video_support;
+static bool acpi_video_caps_checked;
+
+static acpi_status
+acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
+			  void **retyurn_value)
+{
+	long *cap = context;
+	acpi_handle h_dummy;
+
+	if (ACPI_SUCCESS(acpi_get_handle(handle, "_BCM", &h_dummy)) &&
+	    ACPI_SUCCESS(acpi_get_handle(handle, "_BCL", &h_dummy))) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
+				  "support\n"));
+		*cap |= ACPI_VIDEO_BACKLIGHT;
+		/* We have backlight support, no need to scan further */
+		return AE_CTRL_TERMINATE;
+	}
+	return 0;
+}
+
+/* Returns true if the device is a video device which can be handled by
+ * video.ko.
+ * The device will get a Linux specific CID added in scan.c to
+ * identify the device as an ACPI graphics device
+ * Be aware that the graphics device may not be physically present
+ * Use acpi_video_get_capabilities() to detect general ACPI video
+ * capabilities of present cards
+ */
+long acpi_is_video_device(struct acpi_device *device)
+{
+	acpi_handle h_dummy;
+	long video_caps = 0;
+
+	if (!device)
+		return 0;
+
+	/* Does this device able to support video switching ? */
+	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
+	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
+		video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
+
+	/* Does this device able to retrieve a video ROM ? */
+	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
+		video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
+
+	/* Does this device able to configure which video head to be POSTed ? */
+	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
+	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
+	    ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
+		video_caps |= ACPI_VIDEO_DEVICE_POSTING;
+
+	/* Only check for backlight functionality if one of the above hit. */
+	if (video_caps)
+		acpi_walk_namespace(ACPI_TYPE_DEVICE, device->handle,
+				    ACPI_UINT32_MAX, acpi_backlight_cap_match,
+				    &video_caps, NULL);
+
+	return video_caps;
+}
+EXPORT_SYMBOL(acpi_is_video_device);
+
+static acpi_status
+find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+	long *cap = context;
+	struct device *dev;
+	struct acpi_device *acpi_dev;
+
+	const struct acpi_device_id video_ids[] = {
+		{ACPI_VIDEO_HID, 0},
+		{"", 0},
+	};
+	if (acpi_bus_get_device(handle, &acpi_dev))
+		return AE_OK;
+
+	if (!acpi_match_device_ids(acpi_dev, video_ids)) {
+		dev = acpi_get_physical_pci_device(handle);
+		if (!dev)
+			return AE_OK;
+		put_device(dev);
+		*cap |= acpi_is_video_device(acpi_dev);
+	}
+	return AE_OK;
+}
+
+/*
+ * Returns the video capabilities of a specific ACPI graphics device
+ *
+ * if NULL is passed as argument all ACPI devices are enumerated and
+ * all graphics capabilities of physically present devices are
+ * summerized and returned. This is cached and done only once.
+ */
+long acpi_video_get_capabilities(acpi_handle graphics_handle)
+{
+	long caps = 0;
+	struct acpi_device *tmp_dev;
+	acpi_status status;
+
+	if (acpi_video_caps_checked && graphics_handle == NULL)
+		return acpi_video_support;
+
+	if (!graphics_handle) {
+		/* Only do the global walk through all graphics devices once */
+		acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+				    ACPI_UINT32_MAX, find_video,
+				    &caps, NULL);
+		/* There might be boot param flags set already... */
+		acpi_video_support |= caps;
+		acpi_video_caps_checked = 1;
+		/* Add blacklists here. Be careful to use the right *DMI* bits
+		 * to still be able to override logic via boot params, e.g.:
+		 *
+		 *   if (dmi_name_in_vendors("XY")) {
+		 *	acpi_video_support |=
+		 *		ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR;
+		 *	acpi_video_support |=
+		 *		ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
+		 *}
+		 */
+	} else {
+		status = acpi_bus_get_device(graphics_handle, &tmp_dev);
+		if (ACPI_FAILURE(status)) {
+			ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
+			return 0;
+		}
+		acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
+				    ACPI_UINT32_MAX, find_video,
+				    &caps, NULL);
+	}
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
+			  graphics_handle ? caps : acpi_video_support,
+			  graphics_handle ? "on device " : "in general",
+			  graphics_handle ? acpi_device_bid(tmp_dev) : ""));
+	return caps;
+}
+EXPORT_SYMBOL(acpi_video_get_capabilities);
+
+/* Returns true if video.ko can do backlight switching */
+int acpi_video_backlight_support(void)
+{
+	/*
+	 * We must check whether the ACPI graphics device is physically plugged
+	 * in. Therefore this must be called after binding PCI and ACPI devices
+	 */
+	if (!acpi_video_caps_checked)
+		acpi_video_get_capabilities(NULL);
+
+	/* First check for boot param -> highest prio */
+	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
+		return 0;
+	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
+		return 1;
+
+	/* Then check for DMI blacklist -> second highest prio */
+	if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
+		return 0;
+	else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
+		return 1;
+
+	/* Then go the default way */
+	return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
+}
+EXPORT_SYMBOL(acpi_video_backlight_support);
+
+/*
+ * Returns true if video.ko can do display output switching.
+ * This does not work well/at all with binary graphics drivers
+ * which disable system io ranges and do it on their own.
+ */
+int acpi_video_display_switch_support(void)
+{
+	if (!acpi_video_caps_checked)
+		acpi_video_get_capabilities(NULL);
+
+	if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR)
+		return 0;
+	else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO)
+		return 1;
+
+	if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR)
+		return 0;
+	else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO)
+		return 1;
+
+	return acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING;
+}
+EXPORT_SYMBOL(acpi_video_display_switch_support);
+
+/*
+ * Use acpi_display_output=vendor/video or acpi_backlight=vendor/video
+ * To force that backlight or display output switching is processed by vendor
+ * specific acpi drivers or video.ko driver.
+ */
+int __init acpi_backlight(char *str)
+{
+	if (str == NULL || *str == '\0')
+		return 1;
+	else {
+		if (!strcmp("vendor", str))
+			acpi_video_support |=
+				ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
+		if (!strcmp("video", str))
+			acpi_video_support |=
+				ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO;
+	}
+	return 1;
+}
+__setup("acpi_backlight=", acpi_backlight);
+
+int __init acpi_display_output(char *str)
+{
+	if (str == NULL || *str == '\0')
+		return 1;
+	else {
+		if (!strcmp("vendor", str))
+			acpi_video_support |=
+				ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR;
+		if (!strcmp("video", str))
+			acpi_video_support |=
+				ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO;
+	}
+	return 1;
+}
+__setup("acpi_display_output=", acpi_display_output);

drivers/misc/acer-wmi.c

@@ -1297,6 +1297,12 @@ static int __init acer_wmi_init(void)
 
 	set_quirks();
 
+	if (!acpi_video_backlight_support() && has_cap(ACER_CAP_BRIGHTNESS)) {
+		interface->capability &= ~ACER_CAP_BRIGHTNESS;
+		printk(ACER_INFO "Brightness must be controlled by "
+		       "generic video driver\n");
+	}
+
 	if (platform_driver_register(&acer_platform_driver)) {
 		printk(ACER_ERR "Unable to register platform driver.\n");
 		goto error_platform_register;

drivers/misc/asus-laptop.c

@@ -1208,9 +1208,13 @@ static int __init asus_laptop_init(void)
 
 	dev = acpi_get_physical_device(hotk->device->handle);
 
+	if (!acpi_video_backlight_support()) {
 		result = asus_backlight_init(dev);
 		if (result)
 			goto fail_backlight;
+	} else
+		printk(ASUS_INFO "Brightness ignored, must be controlled by "
+		       "ACPI video driver\n");
 
 	result = asus_led_init(dev);
 	if (result)

drivers/misc/compal-laptop.c

@@ -326,12 +326,14 @@ static int __init compal_init(void)
 
 	/* Register backlight stuff */
 
+	if (!acpi_video_backlight_support()) {
 		compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
 							    &compalbl_ops);
 		if (IS_ERR(compalbl_device))
 			return PTR_ERR(compalbl_device);
 
 		compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
+	}
 
 	ret = platform_driver_register(&compal_driver);
 	if (ret)

drivers/misc/eeepc-laptop.c

@@ -825,9 +825,15 @@ static int __init eeepc_laptop_init(void)
 		return -ENODEV;
 	}
 	dev = acpi_get_physical_device(ehotk->device->handle);
+
+	if (!acpi_video_backlight_support()) {
 		result = eeepc_backlight_init(dev);
 		if (result)
 			goto fail_backlight;
+	} else
+		printk(EEEPC_INFO "Backlight controlled by ACPI video "
+		       "driver\n");
+
 	result = eeepc_hwmon_init(dev);
 	if (result)
 		goto fail_hwmon;

drivers/misc/fujitsu-laptop.c

@@ -1005,16 +1005,16 @@ static int __init fujitsu_init(void)
 
 	/* Register backlight stuff */
 
+	if (!acpi_video_backlight_support()) {
 		fujitsu->bl_device =
 			backlight_device_register("fujitsu-laptop", NULL, NULL,
 						  &fujitsubl_ops);
 		if (IS_ERR(fujitsu->bl_device))
 			return PTR_ERR(fujitsu->bl_device);
-
 		max_brightness = fujitsu->max_brightness;
-
 		fujitsu->bl_device->props.max_brightness = max_brightness - 1;
 		fujitsu->bl_device->props.brightness = fujitsu->brightness_level;
+	}
 
 	ret = platform_driver_register(&fujitsupf_driver);
 	if (ret)
@@ -1050,6 +1050,7 @@ static int __init fujitsu_init(void)
 
 fail_backlight:
 
+	if (fujitsu->bl_device)
 		backlight_device_unregister(fujitsu->bl_device);
 
 fail_platform_device2:
@@ -1077,6 +1078,7 @@ static void __exit fujitsu_cleanup(void)
 			   &fujitsupf_attribute_group);
 	platform_device_unregister(fujitsu->pf_device);
 	platform_driver_unregister(&fujitsupf_driver);
+	if (fujitsu->bl_device)
 		backlight_device_unregister(fujitsu->bl_device);
 
 	acpi_bus_unregister_driver(&acpi_fujitsu_driver);

drivers/misc/msi-laptop.c

@@ -347,12 +347,16 @@ static int __init msi_init(void)
 
 	/* Register backlight stuff */
 
-	msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,
-						&msibl_ops);
+	if (acpi_video_backlight_support()) {
+		printk(KERN_INFO "MSI: Brightness ignored, must be controlled "
+		       "by ACPI video driver\n");
+	} else {
+		msibl_device = backlight_device_register("msi-laptop-bl", NULL,
+							 NULL, &msibl_ops);
 		if (IS_ERR(msibl_device))
 			return PTR_ERR(msibl_device);
-
 		msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
+	}
 
 	ret = platform_driver_register(&msipf_driver);
 	if (ret)

drivers/misc/sony-laptop.c

@@ -1038,7 +1038,11 @@ static int sony_nc_add(struct acpi_device *device)
 		goto outinput;
 	}
 
-	if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT", &handle))) {
+	if (!acpi_video_backlight_support()) {
+		printk(KERN_INFO DRV_PFX "Sony: Brightness ignored, must be "
+		       "controlled by ACPI video driver\n");
+	} else if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT",
+						&handle))) {
 		sony_backlight_device = backlight_device_register("sony", NULL,
 								  NULL,
 								  &sony_backlight_ops);

drivers/misc/thinkpad_acpi.c

@@ -4932,16 +4932,25 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
 	 */
 	b = tpacpi_check_std_acpi_brightness_support();
 	if (b > 0) {
-		if (thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO) {
+
+		if (acpi_video_backlight_support()) {
+			if (brightness_enable > 1) {
+				printk(TPACPI_NOTICE
+				       "Standard ACPI backlight interface "
+				       "available, not loading native one.\n");
+				return 1;
+			} else if (brightness_enable == 1) {
 				printk(TPACPI_NOTICE
-			       "Lenovo BIOS switched to ACPI backlight "
-			       "control mode\n");
+				       "Backlight control force enabled, even if standard "
+				       "ACPI backlight interface is available\n");
 			}
+		} else {
 			if (brightness_enable > 1) {
 				printk(TPACPI_NOTICE
-			       "standard ACPI backlight interface "
-			       "available, not loading native one...\n");
-			return 1;
+				       "Standard ACPI backlight interface not "
+				       "available, thinkpad_acpi native "
+				       "brightness control enabled\n");
+			}
 		}
 	}
 

include/acpi/acpi_bus.h

@@ -380,6 +380,8 @@ struct acpi_bus_type {
 int register_acpi_bus_type(struct acpi_bus_type *);
 int unregister_acpi_bus_type(struct acpi_bus_type *);
 struct device *acpi_get_physical_device(acpi_handle);
+struct device *acpi_get_physical_pci_device(acpi_handle);
+
 /* helper */
 acpi_handle acpi_get_child(acpi_handle, acpi_integer);
 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int);

include/linux/acpi.h

@@ -190,6 +190,50 @@ extern bool wmi_has_guid(const char *guid);
 
 #endif	/* CONFIG_ACPI_WMI */
 
+#define ACPI_VIDEO_OUTPUT_SWITCHING			0x0001
+#define ACPI_VIDEO_DEVICE_POSTING			0x0002
+#define ACPI_VIDEO_ROM_AVAILABLE			0x0004
+#define ACPI_VIDEO_BACKLIGHT				0x0008
+#define ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR		0x0010
+#define ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO		0x0020
+#define ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR	0x0040
+#define ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO		0x0080
+#define ACPI_VIDEO_BACKLIGHT_DMI_VENDOR			0x0100
+#define ACPI_VIDEO_BACKLIGHT_DMI_VIDEO			0x0200
+#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR		0x0400
+#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO		0x0800
+
+#if defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE)
+
+extern long acpi_video_get_capabilities(acpi_handle graphics_dev_handle);
+extern long acpi_is_video_device(struct acpi_device *device);
+extern int acpi_video_backlight_support(void);
+extern int acpi_video_display_switch_support(void);
+
+#else
+
+static inline long acpi_video_get_capabilities(acpi_handle graphics_dev_handle)
+{
+	return 0;
+}
+
+static inline long acpi_is_video_device(struct acpi_device *device)
+{
+	return 0;
+}
+
+static inline int acpi_video_backlight_support(void)
+{
+	return 0;
+}
+
+static inline int acpi_video_display_switch_support(void)
+{
+	return 0;
+}
+
+#endif /* defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE) */
+
 extern int acpi_blacklisted(void);
 #ifdef CONFIG_DMI
 extern void acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d);