media: v4l2-subdev: Refactor events

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Controls can be exposed to userspace via a v4l-subdevX device, and
userspace has to be able to subscribe to control events so that it is
notified when the control changes value. If a control handler is set for
the subdev then set the HAS_EVENTS flag automatically into
v4l2_subdev_init_finalize() and use v4l2_ctrl_subdev_subscribe_event() and
v4l2_event_subdev_unsubscribe() as default if subdev don't have
.(un)subscribe control operations. This simplifies subdev drivers by
avoiding the need to set the V4L2_SUBDEV_FL_HAS_EVENTS flag and plug the
event handlers, and ensures consistency of the API exposed to userspace.

Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

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Tommaso Merciai 2024-10-20 18:35:32 +02:00 • committed by Hans Verkuil

parent 3bb5080293

commit e7724e2319

1 changed files with 20 additions and 2 deletions

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drivers/media/v4l2-core/v4l2-subdev.c

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