[PATCH v7 7/7] media: uvcvideo: document UVC v1.5 ROI

[Yunke Cao <yunkec@google.com>]

Added documentation of V4L2_CID_UVC_REGION_OF_INTEREST_RECT and
V4L2_CID_UVC_REGION_OF_INTEREST_AUTO.

Signed-off-by: Yunke Cao <yunkec@google.com>
---
 .../userspace-api/media/drivers/uvcvideo.rst  | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/Documentation/userspace-api/media/drivers/uvcvideo.rst b/Documentation/userspace-api/media/drivers/uvcvideo.rst
index a290f9fadae9..ee4c182aa274 100644
--- a/Documentation/userspace-api/media/drivers/uvcvideo.rst
+++ b/Documentation/userspace-api/media/drivers/uvcvideo.rst
@@ -181,6 +181,7 @@ Argument: struct uvc_xu_control_mapping
 	UVC_CTRL_DATA_TYPE_BOOLEAN	Boolean
 	UVC_CTRL_DATA_TYPE_ENUM		Enumeration
 	UVC_CTRL_DATA_TYPE_BITMASK	Bitmask
+	UVC_CTRL_DATA_TYPE_RECT		Rectangular area
 
 
 UVCIOC_CTRL_QUERY - Query a UVC XU control
@@ -255,3 +256,63 @@ Argument: struct uvc_xu_control_query
 	__u8	query		Request code to send to the device
 	__u16	size		Control data size (in bytes)
 	__u8	*data		Control value
+
+Private V4L2 controls
+---------------------
+
+A few UVC specific V4L2 control IDs are listed below.
+
+``V4L2_CID_UVC_REGION_OF_INTEREST_RECT (struct)``
+	This control determines the region of interest (ROI). ROI is an
+	rectangular area represented by a struct :c:type:`v4l2_rect`. The
+	rectangle is in global sensor coordinates and pixel units. It is
+	independent of the field of view, not impacted by any cropping or
+	scaling.
+
+	Use ``V4L2_CTRL_WHICH_MIN_VAL`` and ``V4L2_CTRL_WHICH_MAX_VAL`` to query
+	the range of rectangle sizes. For example, a device can have a minimum
+	ROI rectangle of 1x1@0x0 and a maximum of 640x480@0x0.
+
+	Setting a ROI allows the camera to optimize the capture for the region.
+	The value of ``V4L2_CID_REGION_OF_INTEREST_AUTO`` control determines
+	the detailed behavior.
+
+
+``V4L2_CID_UVC_REGION_OF_INTEREST_AUTO (bitmask)``
+	This determines which, if any, on board features should track to the
+	Region of Interest specified by the current value of
+	``V4L2_CID_UVD__REGION_OF_INTEREST_RECT``.
+
+	Max value is a mask indicating all supported Auto
+	Controls.
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_EXPOSURE``
+      - Setting this to true enables automatic exposure time for the specified
+	region.
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_IRIS``
+      - Setting this to true enables automatic iris aperture for the specified
+	region.
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_WHITE_BALANCE``
+      - Setting this to true enables automatic white balance adjustment for the
+	specified region.
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_FOCUS``
+      - Setting this to true enables automatic focus adjustment for the
+	specified region.
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_FACE_DETECT``
+      - Setting this to true enables automatic face detection for the
+	specified region.
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_DETECT_AND_TRACK``
+      - Setting this to true enables automatic face detection and tracking. The
+	current value of ``V4L2_CID_REGION_OF_INTEREST_RECT`` may be updated by
+	the driver.
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_IMAGE_STABILIZATION``
+      - Setting this to true enables automatic image stabilization. The
+	current value of ``V4L2_CID_REGION_OF_INTEREST_RECT`` may be updated by
+	the driver.
+    * - ``V4L2_REGION_OF_INTEREST_AUTO_HIGHER_QUALITY``
+      - Setting this to true enables automatically capture the specified region
+	with higher quality if possible.
-- 
2.37.0.rc0.161.g10f37bed90-goog