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Commit 22fa4279 authored by Sylwester Nawrocki's avatar Sylwester Nawrocki Committed by Mauro Carvalho Chehab
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[media] V4L: Add v4l2_ctrl_subdev_subscribe_event() helper function 



Add a v4l2 core helper function that can be used as the subdev
.subscribe_event handler. This allows to eliminate some boilerplate
from drivers that are only handling the control events.

Signed-off-by: default avatarSylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 4f4d14b7

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

+9 −0
Original line number Original line Diff line number Diff line
@@ -2885,6 +2885,15 @@ int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh, 
}

}

EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);

EXPORT_SYMBOL(v4l2_ctrl_subscribe_event);





int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,

				     struct v4l2_event_subscription *sub)

{

	if (!sd->ctrl_handler)

		return -EINVAL;

	return v4l2_ctrl_subscribe_event(fh, sub);

}

EXPORT_SYMBOL(v4l2_ctrl_subdev_subscribe_event);



unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)

unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)

{

{

	struct v4l2_fh *fh = file->private_data;

	struct v4l2_fh *fh = file->private_data;

include/media/v4l2-ctrls.h

+5 −0
Original line number Original line Diff line number Diff line
@@ -654,4 +654,9 @@ int v4l2_subdev_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *cs 
int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);

int v4l2_subdev_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);

int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);

int v4l2_subdev_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl);





/* Can be used as a subscribe_event function that just subscribes control

   events. */

int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,

				     struct v4l2_event_subscription *sub);



#endif
 
#endif