[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: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 3f27571..9051ec5 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -2885,6 +2885,15 @@
}
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)
{
struct v4l2_fh *fh = file->private_data;
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 91125b6..1e84946 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -654,4 +654,9 @@
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);
+/* 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
