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| author | Tommaso Merciai <tomm.merciai@gmail.com> | 2024-10-20 19:35:32 +0300 |
|---|---|---|
| committer | Hans Verkuil <hverkuil@xs4all.nl> | 2024-11-07 11:05:57 +0300 |
| commit | e7724e23196ab1b4bc843aa60e917967d95697e4 (patch) | |
| tree | d5387580e95d051165027875efaca6a8601f445a /tools/perf/scripts/python/stackcollapse.py | |
| parent | 3bb5080293a3c96a41dd707db64ab8c7d8c471ae (diff) | |
| download | linux-e7724e23196ab1b4bc843aa60e917967d95697e4.tar.xz | |
media: v4l2-subdev: Refactor events
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>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions