media: v4l: subdev: Make stream argument optional in state access functions

The sub-device state access functions take three arguments: sub-device
state, pad and stream. The stream is not relevant for the majority of
drivers and having to specify 0 for the stream is considered a nuisance.

Provide a two-argument macros for these state access functions to cover
the needs of stream-unaware users.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

1 files changed, 40 insertions, 9 deletions

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index f144d49a825c..c8ac91a2cdb8 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1534,11 +1534,18 @@ int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
 				     const struct v4l2_subdev_krouting *routing,
 				     const struct v4l2_mbus_framefmt *fmt);
 
+/*
+ * A macro to generate the macro or function name for sub-devices state access
+ * wrapper macros below.
+ */
+#define __v4l2_subdev_state_gen_call(NAME, _1, ARG, ...)	\
+	__v4l2_subdev_state_get_ ## NAME ## ARG
+
 /**
  * v4l2_subdev_state_get_format() - Get pointer to a stream format
  * @state: subdevice state
  * @pad: pad id
- * @stream: stream id
+ * @...: stream id (optional argument)
  *
  * This returns a pointer to &struct v4l2_mbus_framefmt for the given pad +
  * stream in the subdev state.
@@ -1546,15 +1553,29 @@ int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
  * For stream-unaware drivers the format for the corresponding pad is returned.
  * If the pad does not exist, NULL is returned.
  */
+/*
+ * Wrap v4l2_subdev_state_get_format(), allowing the function to be called with
+ * two or three arguments. The purpose of the __v4l2_subdev_state_get_format()
+ * macro below is to come up with the name of the function or macro to call,
+ * using the last two arguments (_stream and _pad). The selected function or
+ * macro is then called using the arguments specified by the caller. A similar
+ * arrangement is used for v4l2_subdev_state_crop() and
+ * v4l2_subdev_state_compose() below.
+ */
+#define v4l2_subdev_state_get_format(state, pad, ...)			\
+	__v4l2_subdev_state_gen_call(format, ##__VA_ARGS__, , _pad)	\
+		(state, pad, ##__VA_ARGS__)
+#define __v4l2_subdev_state_get_format_pad(state, pad)	\
+	__v4l2_subdev_state_get_format(state, pad, 0)
 struct v4l2_mbus_framefmt *
-v4l2_subdev_state_get_format(struct v4l2_subdev_state *state, unsigned int pad,
-			     u32 stream);
+__v4l2_subdev_state_get_format(struct v4l2_subdev_state *state,
+			       unsigned int pad, u32 stream);
 
 /**
  * v4l2_subdev_state_get_crop() - Get pointer to a stream crop rectangle
  * @state: subdevice state
  * @pad: pad id
- * @stream: stream id
+ * @...: stream id (optional argument)
  *
  * This returns a pointer to crop rectangle for the given pad + stream in the
  * subdev state.
@@ -1562,15 +1583,20 @@ v4l2_subdev_state_get_format(struct v4l2_subdev_state *state, unsigned int pad,
  * For stream-unaware drivers the crop rectangle for the corresponding pad is
  * returned. If the pad does not exist, NULL is returned.
  */
+#define v4l2_subdev_state_get_crop(state, pad, ...)			\
+	__v4l2_subdev_state_gen_call(crop, ##__VA_ARGS__, , _pad)	\
+		(state, pad, ##__VA_ARGS__)
+#define __v4l2_subdev_state_get_crop_pad(state, pad)	\
+	__v4l2_subdev_state_get_crop(state, pad, 0)
 struct v4l2_rect *
-v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad,
-			   u32 stream);
+__v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad,
+			     u32 stream);
 
 /**
  * v4l2_subdev_state_get_compose() - Get pointer to a stream compose rectangle
  * @state: subdevice state
  * @pad: pad id
- * @stream: stream id
+ * @...: stream id (optional argument)
  *
  * This returns a pointer to compose rectangle for the given pad + stream in the
  * subdev state.
@@ -1578,9 +1604,14 @@ v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad,
  * For stream-unaware drivers the compose rectangle for the corresponding pad is
  * returned. If the pad does not exist, NULL is returned.
  */
+#define v4l2_subdev_state_get_compose(state, pad, ...)			\
+	__v4l2_subdev_state_gen_call(compose, ##__VA_ARGS__, , _pad)	\
+		(state, pad, ##__VA_ARGS__)
+#define __v4l2_subdev_state_get_compose_pad(state, pad)	\
+	__v4l2_subdev_state_get_compose(state, pad, 0)
 struct v4l2_rect *
-v4l2_subdev_state_get_compose(struct v4l2_subdev_state *state, unsigned int pad,
-			      u32 stream);
+__v4l2_subdev_state_get_compose(struct v4l2_subdev_state *state,
+				unsigned int pad, u32 stream);
 
 /**
  * v4l2_subdev_routing_find_opposite_end() - Find the opposite stream