[ACPI] Extensions for Display Adapters (Bruno Ducrot)

http://bugme.osdl.org/show_bug.cgi?id=1944Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

Documentation/power/video_extension.txt

+This driver implement the ACPI Extensions For Display Adapters
+for integrated graphics devices on motherboard, as specified in
+ACPI 2.0 Specification, Appendix B, allowing to perform some basic
+control like defining the video POST device, retrieving EDID information
+or to setup a video output, etc.  Note that this is an ref. implementation only.
+It may or may not work for your integrated video device.
+
+Interfaces exposed to userland through /proc/acpi/video:
+
+VGA/info : display the supported video bus device capability like ,Video ROM, CRT/LCD/TV.
+VGA/ROM :  Used to get a copy of the display devices' ROM data (up to 4k).
+VGA/POST_info : Used to determine what options are implemented.
+VGA/POST : Used to get/set POST device.
+VGA/DOS : Used to get/set ownership of output switching:
+	Please refer ACPI spec B.4.1 _DOS
+VGA/CRT : CRT output
+VGA/LCD : LCD output
+VGA/TV : TV output 
+VGA/*/brightness : Used to get/set brightness of output device
+
+Notify event through /proc/acpi/event:
+
+#define ACPI_VIDEO_NOTIFY_SWITCH        0x80
+#define ACPI_VIDEO_NOTIFY_PROBE         0x81
+#define ACPI_VIDEO_NOTIFY_CYCLE         0x82
+#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT   0x83
+#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT   0x84
+
+#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS      0x82
+#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS        0x83
+#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS        0x84
+#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS       0x85
+#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF           0x86
+

drivers/acpi/Kconfig

@@ -110,6 +110,20 @@ config ACPI_BUTTON
 	  down the system.  Until then, you can cat it, and see output when
 	  a button is pressed.
 
+config ACPI_VIDEO
+	tristate "Video"
+	depends on ACPI_INTERPRETER
+	depends on !IA64_SGI_SN
+	default m
+	help
+	  This driver implement the ACPI Extensions For Display Adapters
+	  for integrated graphics devices on motherboard, as specified in
+	  ACPI 2.0 Specification, Appendix B, allowing to perform some basic
+	  control like defining the video POST device, retrieving EDID information
+	  or to setup a video output, etc.
+	  Note that this is an ref. implementation only.  It may or may not work
+	  for your integrated video device.
+
 config ACPI_FAN
 	tristate "Fan"
 	depends on ACPI_INTERPRETER

drivers/acpi/Makefile

@@ -38,6 +38,7 @@ obj-$(CONFIG_ACPI_BATTERY)	+= battery.o
 obj-$(CONFIG_ACPI_BUTTON)	+= button.o
 obj-$(CONFIG_ACPI_EC)		+= ec.o
 obj-$(CONFIG_ACPI_FAN)		+= fan.o
+obj-$(CONFIG_ACPI_VIDEO)	+= video.o
 obj-$(CONFIG_ACPI_PCI)		+= pci_root.o pci_link.o pci_irq.o pci_bind.o
 obj-$(CONFIG_ACPI_POWER)	+= power.o
 obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o

drivers/acpi/scan.c

@@ -312,7 +312,12 @@ acpi_bus_match (
 	struct acpi_device	*device,
 	struct acpi_driver	*driver)
 {
-	return acpi_match_ids(device, driver->ids);
+	int error = 0;
+
+	error = driver->ops.match ? driver->ops.match(device, driver) : 
+			acpi_match_ids(device, driver->ids) ;
+
+	return error;
 }
 
 

include/acpi/acpi_bus.h

@@ -104,6 +104,7 @@ typedef int (*acpi_op_suspend)	(struct acpi_device *device, int state);
 typedef int (*acpi_op_resume)	(struct acpi_device *device, int state);
 typedef int (*acpi_op_scan)	(struct acpi_device *device);
 typedef int (*acpi_op_bind)	(struct acpi_device *device);
+typedef int (*acpi_op_match)	(struct acpi_device *device, struct acpi_driver *driver);
 
 struct acpi_device_ops {
 	acpi_op_add		add;
@@ -115,6 +116,7 @@ struct acpi_device_ops {
 	acpi_op_resume		resume;
 	acpi_op_scan		scan;
 	acpi_op_bind		bind;
+	acpi_op_match		match;
 };
 
 struct acpi_driver {