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authorHan-Lin Chen <hanlinchen@chromium.org>2021-12-03 17:44:24 +0800
committerKieran Bingham <kieran.bingham@ideasonboard.com>2021-12-03 10:23:26 +0000
commit6e80c1bcf410cca4b0c028dd337a749a50f9bb7a (patch)
tree9f35ddd9acd3a09d7a7174202fec7b60496699b7 /Documentation/lens_driver_requirements.rst
parent5d2aad02e86d456f77ca2bab5025ff7044f10125 (diff)
libcamera: camera_lens: Add a new class to model a camera lens
The CameraLens class abstracts camera lens and provides helper functions to ease interactions with them. Signed-off-by: Han-Lin Chen <hanlinchen@chromium.org> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. _lens-driver-requirements:
+
+Lens Driver Requirements
+========================
+
+libcamera handles lens devices in the CameraLens class and defines
+a consistent interface through its API towards other library components.
+
+The CameraLens class uses the V4L2 subdev kernel API to interface with the
+camera lens through a sub-device exposed to userspace by the lens driver.
+
+In order for libcamera to be fully operational and provide all the required
+information to interface with the camera lens to applications and pipeline
+handlers, a set of mandatory features the driver has to support has been defined.
+
+Mandatory Requirements
+----------------------
+
+The lens driver is assumed to be fully compliant with the V4L2 specification.
+
+The lens driver shall support the following V4L2 controls:
+
+* `V4L2_CID_FOCUS_ABSOLUTE`_
+
+.. _V4L2_CID_FOCUS_ABSOLUTE: https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/ext-ctrls-camera.html