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| author |   Luca Ceresoli <luca@lucaceresoli.net> | 2018-12-05 11:55:37 -0500 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2018-12-07 08:31:18 -0500 |
| commit | d138091ffca629a0914a37fde5d2253ef5f31ad2 (patch) | |
| tree | 42cacd21c2f30dea4c886c4066af778716ae0895 /include/media | |
| parent | media: vivid: Improve timestamping (diff) | |
| download | linux-dev-d138091ffca629a0914a37fde5d2253ef5f31ad2.tar.xz linux-dev-d138091ffca629a0914a37fde5d2253ef5f31ad2.zip | |
media: v4l2-subdev: document controls need _FL_HAS_DEVNODE
Control events can be subscribed and received by the user. Therefore
drivers that support controls must expose the
V4L2_SUBDEV_FL_HAS_EVENTS flag.
[As discussed in https://lkml.org/lkml/2018/11/27/637]
Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-subdev.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index 9102d6ca566e..47af609dc8f1 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -776,7 +776,11 @@ struct v4l2_subdev_internal_ops { #define V4L2_SUBDEV_FL_IS_SPI (1U << 1) /* Set this flag if this subdev needs a device node. */ #define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2) -/* Set this flag if this subdev generates events. */ +/* + * Set this flag if this subdev generates events. + * Note controls can send events, thus drivers exposing controls + * should set this flag. + */ #define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3) struct regulator_bulk_data; |