ACPI / video: move video_extension.txt to Documentation/acpi

ACPI video driver is written according to ACPI spec, appendix B: Video
Extensions. So it better be put under the acpi directory instead of the
power directory. This patch moves the file there without any other
change.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/Documentation/acpi/video_extension.txt b/Documentation/acpi/video_extension.txt
new file mode 100644
index 000000000000..b2f9b1598ac2
--- /dev/null
+++ b/Documentation/acpi/video_extension.txt
@@ -0,0 +1,37 @@
+ACPI video extensions
+~~~~~~~~~~~~~~~~~~~~~
+
+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/TVO : 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
+