| .. 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 |
