Add ancillary links #123
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Add ancillary links #123
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When iterating over the media graph, don't follow links that are not data links. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Daniel Scally <djrscally@gmail.com>
To describe in the kernel the connection between devices and their supporting peripherals (for example, a camera sensor and the vcm driving the focusing lens for it), add a new type of media link to introduce the concept of these ancillary links. Add some elements to the uAPI documentation to explain the new link type, their purpose and some aspects of their current implementation. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Daniel Scally <djrscally@gmail.com>
Now we have three types of media link, printing the right name during debug output is slightly more complicated. Add a helper function to make it easier. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Daniel Scally <djrscally@gmail.com>
Add functions to create ancillary links, so that they don't need to be manually created by users. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Daniel Scally <djrscally@gmail.com>
Upon an async fwnode match, there's some typical behaviour that the notifier and matching subdev will want to do. For example, a notifier representing a sensor matching to an async subdev representing its VCM will want to create an ancillary link to expose that relationship to userspace. To avoid lots of code in individual drivers, try to build these links within v4l2 core. Signed-off-by: Daniel Scally <djrscally@gmail.com>
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Thanks, I'll give it a try in a second. |
qzed
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Changes: - Add auto-focus support for world-facing camera (@djrscally) - PR: linux-surface/kernel#123 - Refactor Surface Aggregator subsystem device hubs Links: - kernel: linux-surface/kernel@6ea3d62
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Ancillary links are a new kind of media link intended to describe the connection between media subdevs that are intended to operate as a single logical unit, principally flash LEDs and lens motors. Libcamera supports them already and includes auto focus algorithms now (at least on master) so with this series, the world facing camera should focus properly.