1 files changed, 31 insertions, 4 deletions

diff --git a/4a-hal/4a-hal-controllers/4a-hal-controllers-alsacore-link.c b/4a-hal/4a-hal-controllers/4a-hal-controllers-alsacore-link.c
index cc29dc9..7ea61ac 100644
--- a/4a-hal/4a-hal-controllers/4a-hal-controllers-alsacore-link.c
+++ b/4a-hal/4a-hal-controllers/4a-hal-controllers-alsacore-link.c
@@ -488,7 +488,10 @@ void HalCtlsActionOnAlsaCtl(AFB_ReqT request)
 
 	json_object *requestJson,
 		    *valueJ,
-		    *convertedJ;
+		    *convertedJ,
+		    *answerJ,
+		    *previousControlValuesJ,
+		    *normalizedPreviousControlValuesJ;
 
 	apiHandle = (AFB_ApiT) AFB_ReqGetApi(request);
 	if(! apiHandle) {
@@ -524,19 +527,43 @@ void HalCtlsActionOnAlsaCtl(AFB_ReqT request)
 		return;
 	}
 
+	snprintf(cardIdString, 6, "hw:%i", currentCtlHalData->sndCardId);
+
+	if(HalCtlsGetAlsaCtlValues(apiHandle, cardIdString, &currentAlsaCtl->ctl, &previousControlValuesJ)) {
+		AFB_ReqFailF(request, "previous_values", "Error when trying to get unchanged alsa control values");
+		return;
+	}
+	else if(HalCtlsConvertJsonValues(apiHandle,
+					 &currentAlsaCtl->ctl.alsaCtlProperties,
+					 previousControlValuesJ,
+					 &normalizedPreviousControlValuesJ,
+					 CONVERSION_ALSACORE_TO_NORMALIZED)) {
+		AFB_ReqFailF(request,
+			     "request_json",
+			     "Error when trying to normalize unchanged alsa control values json '%s'",
+			     json_object_get_string(previousControlValuesJ));
+		json_object_put(previousControlValuesJ);
+		return;
+	}
+
 	requestJson = AFB_ReqJson(request);
 	if(! requestJson) {
-		AFB_ReqFail(request, "request_json", "Can't get request json");
+		wrap_json_pack(&answerJ,
+			       "{s:o}",
+			       "current", normalizedPreviousControlValuesJ);
+		AFB_ReqSuccess(request, answerJ, "Current controls values");
+		json_object_put(previousControlValuesJ);
 		return;
 	}
 
+	json_object_put(previousControlValuesJ);
+	json_object_put(normalizedPreviousControlValuesJ);
+
 	if(! json_object_is_type(requestJson, json_type_object)) {
 		AFB_ReqFailF(request, "request_json", "Request json is not valid '%s'", json_object_get_string(requestJson));
 		return;
 	}
 
-	snprintf(cardIdString, 6, "hw:%i", currentCtlHalData->sndCardId);
-
 	if(wrap_json_unpack(requestJson, "{s:o}", "value", &valueJ)) {
 		AFB_ReqFailF(request,
 			     "request_json", "Error when trying to get request value object inside request '%s'",