[PATCH 4/9] V4L: add convenience macros to the subdevice / Media Controller API

[Guennadi Liakhovetski <g.liakhovetski@gmx.de>]

Drivers, that can be built and work with and without
CONFIG_VIDEO_V4L2_SUBDEV_API, need the v4l2_subdev_get_try_format() and
v4l2_subdev_get_try_crop() functions, even though their return value
should never be dereferenced. Also add convenience macros to init and
clean up subdevice internal media entities.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
---
 include/media/v4l2-subdev.h |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index f0f3358..4670506 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -569,6 +569,9 @@ v4l2_subdev_get_try_crop(struct v4l2_subdev_fh *fh, unsigned int pad)
 {
 	return &fh->try_crop[pad];
 }
+#else
+#define v4l2_subdev_get_try_format(arg...)	NULL
+#define v4l2_subdev_get_try_crop(arg...)	NULL
 #endif
 
 extern const struct v4l2_file_operations v4l2_subdev_fops;
@@ -610,4 +613,12 @@ void v4l2_subdev_init(struct v4l2_subdev *sd,
 	((!(sd) || !(sd)->v4l2_dev || !(sd)->v4l2_dev->notify) ? -ENODEV : \
 	 (sd)->v4l2_dev->notify((sd), (notification), (arg)))
 
+#if defined(CONFIG_MEDIA_CONTROLLER)
+#define subdev_media_entity_init(sd, n, p, e)	media_entity_init(&(sd)->entity, n, p, e)
+#define subdev_media_entity_cleanup(sd)		media_entity_cleanup(&(sd)->entity)
+#else
+#define subdev_media_entity_init(sd, n, p, e)	0
+#define subdev_media_entity_cleanup(sd)		do {} while (0)
+#endif
+
 #endif
-- 
1.7.2.5