ASoC: rsnd: add rsnd_mod_next() for for_each_rsnd_mod_xxx()

Current rsnd driver is using too complex macro for for-loop of each mod.
In order to simplify this issue, this patch adds new rsnd_mod_next()
which is non-macro.
Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

@@ -348,6 +348,29 @@ u32 rsnd_get_dalign(struct rsnd_mod *mod, struct rsnd_dai_stream *io)
 /*
  *	rsnd_dai functions
  */
+struct rsnd_mod *rsnd_mod_next(int *iterator,
+			       struct rsnd_dai_stream *io,
+			       enum rsnd_mod_type *array,
+			       int array_size)
+{
+	struct rsnd_mod *mod;
+	enum rsnd_mod_type type;
+	int max = array ? array_size : RSND_MOD_MAX;
+
+	for (; *iterator < max; (*iterator)++) {
+		type = (array) ? array[*iterator] : *iterator;
+		mod = io->mod[type];
+		if (!mod)
+			continue;
+
+		(*iterator)++;
+
+		return mod;
+	}
+
+	return NULL;
+}
+
 #define rsnd_mod_call(idx, io, func, param...)			\
 ({								\
 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);		\

sound/soc/sh/rcar/rsnd.h

@@ -346,6 +346,18 @@ void rsnd_mod_interrupt(struct rsnd_mod *mod,
 u32 *rsnd_mod_get_status(struct rsnd_dai_stream *io,
 			 struct rsnd_mod *mod,
 			 enum rsnd_mod_type type);
+struct rsnd_mod *rsnd_mod_next(int *iterator,
+			       struct rsnd_dai_stream *io,
+			       enum rsnd_mod_type *array,
+			       int array_size);
+#define for_each_rsnd_mod(iterator, pos, io)				\
+	for (iterator = 0;						\
+	     (pos = rsnd_mod_next(&iterator, io, NULL, 0));)
+#define for_each_rsnd_mod_arrays(iterator, pos, io, array, size)	\
+	for (iterator = 0;						\
+	     (pos = rsnd_mod_next(&iterator, io, array, size));)
+#define for_each_rsnd_mod_array(iterator, pos, io, array)		\
+	for_each_rsnd_mod_arrays(iterator, pos, io, array, ARRAY_SIZE(array))
 
 void rsnd_parse_connect_common(struct rsnd_dai *rdai,
 		struct rsnd_mod* (*mod_get)(struct rsnd_priv *priv, int id),