ASoC: topology: Add callback for DAPM route load/unload

Add a callback fro clients for notification about DAPM route loading and
unloading.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: lrgirdwo

include/sound/soc-topology.h

@@ -32,6 +32,7 @@ struct snd_kcontrol_new;
 struct snd_soc_dai_link;
 struct snd_soc_dai_driver;
 struct snd_soc_dai;
+struct snd_soc_dapm_route;
 
 /* object scan be loaded and unloaded in groups with identfying indexes */
 #define SND_SOC_TPLG_INDEX_ALL	0	/* ID that matches all FW objects */
@@ -116,6 +117,12 @@ struct snd_soc_tplg_ops {
 	int (*control_unload)(struct snd_soc_component *,
 		struct snd_soc_dobj *);
 
+	/* DAPM graph route element loading and unloading */
+	int (*dapm_route_load)(struct snd_soc_component *, int index,
+		struct snd_soc_dapm_route *route);
+	int (*dapm_route_unload)(struct snd_soc_component *,
+		struct snd_soc_dobj *);
+
 	/* external widget init - used for any driver specific init */
 	int (*widget_load)(struct snd_soc_component *, int index,
 		struct snd_soc_dapm_widget *,

sound/soc/soc-topology.c

@@ -1105,6 +1105,17 @@ static int soc_tplg_kcontrol_elems_load(struct soc_tplg *tplg,
 	return 0;
 }
 
+/* optionally pass new dynamic kcontrol to component driver. */
+static int soc_tplg_add_route(struct soc_tplg *tplg,
+	struct snd_soc_dapm_route *route)
+{
+	if (tplg->comp && tplg->ops && tplg->ops->dapm_route_load)
+		return tplg->ops->dapm_route_load(tplg->comp, tplg->index,
+			route);
+
+	return 0;
+}
+
 static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg,
 	struct snd_soc_tplg_hdr *hdr)
 {
@@ -1153,6 +1164,8 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg,
 		else
 			route.control = elem->control;
 
+		soc_tplg_add_route(tplg, &route);
+
 		/* add route, but keep going if some fail */
 		snd_soc_dapm_add_routes(dapm, &route, 1);
 	}