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authorNiklas Söderlund <niklas.soderlund@ragnatech.se>2019-01-22 16:47:40 +0100
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-01-25 01:59:28 +0200
commit607a9d7f5698fa514b66b0f0a53393fb8435ed12 (patch)
tree9d9ee3d111f0d877c9ca08c9a19a2abd5f8e45cf /include/linux/v4l2-subdev.h
parent889726097613ae5ed4d83a6fd0cc3b0b562f8659 (diff)
libcamera: pipeline_handler: Add camera disconnection support
Pipeline handlers are responsible for creating camera instances, but also for destroying them when devices are unplugged. As camera objects are reference-counted this isn't a straightforward operation and involves the camera manager and camera object itself. Add two helper methods in the PipelineHandler base class to register a camera and to register a media device with the pipeline handler. When registering a camera, the registerCamera() helper method will add it to the camera manager. When registering a media device, the registerMediaDevice() helper method will listen to device disconnection events, and disconnect all cameras created by the pipeline handler as a response. Under the hood the PipelineHandler class needs to keep track of registered cameras in order to handle disconnection. They can't be stored as shared pointers as this would create a circular dependency (the Camera class owns a shared pointer to the pipeline handler). Store them as weak pointers instead. This is safe as a reference to the camera is stored in the camera manager, and doesn't get removed until the camera is unregistered from the manager by the PipelineHandler. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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