Add function to delete an ALSA control

Add function to delete a previously created ALSA control.

BUG-AGL: SPEC-2893

Change-Id: If6890712b167bba021812e899ec878075d5472af
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>

2 files changed, 88 insertions, 0 deletions

diff --git a/src/4a-internals-hal/4a-internals-hal-alsacore-link.c b/src/4a-internals-hal/4a-internals-hal-alsacore-link.c
index 774054c..353383e 100644
--- a/src/4a-internals-hal/4a-internals-hal-alsacore-link.c
+++ b/src/4a-internals-hal/4a-internals-hal-alsacore-link.c
@@ -679,6 +679,92 @@ int InternalHalCreateAlsaCtl(afb_api_t apiHandle, char *cardId, struct InternalH
 	return err;
 }
 
+int InternalHalDeleteAlsaCtl(afb_api_t apiHandle, char *cardId, struct InternalHalAlsaCtl *alsaCtlToDelete)
+{
+	int err = 0, wrapRet;
+
+	char *returnedError = NULL, *returnedInfo = NULL, *removedControlName = NULL;
+
+	json_object *queryJ, *responseJ = NULL;
+
+	if(! apiHandle) {
+		AFB_API_ERROR(apiHandle, "Api handle not available");
+		return -1;
+	}
+
+	if(! cardId) {
+		AFB_API_ERROR(apiHandle, "Card id is not available");
+		return -2;
+	}
+
+	if(! alsaCtlToDelete) {
+		AFB_API_ERROR(apiHandle, "Alsa control data structure is not available");
+		return -3;
+	}
+
+	if(! alsaCtlToDelete->alsaCtlCreation) {
+		AFB_API_ERROR(apiHandle, "Alsa control data structure for deletion is not available");
+		return -4;
+	}
+
+	if(alsaCtlToDelete->alsaCtlCreation != alsaCtlToDelete->alsaCtlProperties) {
+		AFB_API_ERROR(apiHandle, "Alsa control was not previously created");
+		return -5;
+	}
+
+	wrapRet = wrap_json_pack(&queryJ,
+				 "{s:s s:{s:s}}",
+				 "devid", cardId,
+				 "ctl",
+				 "name", alsaCtlToDelete->name);
+	if(wrapRet) {
+		AFB_API_ERROR(apiHandle, "Didn't succeed to allocate delete ALSA control query json object");
+		return -6;
+	}
+
+	if(afb_api_call_sync(apiHandle,
+			     ALSACORE_API,
+			     ALSACORE_REMOVECTL_VERB,
+			     queryJ,
+			     &responseJ,
+			     &returnedError,
+			     &returnedInfo)) {
+		AFB_API_ERROR(apiHandle,
+			      "Something went wrong during call to verb '%s' of api '%s' with error '%s' and info '%s'",
+			      ALSACORE_REMOVECTL_VERB,
+			      ALSACORE_API,
+			      returnedError ? returnedError : "not returned",
+			      returnedInfo ? returnedInfo : "not returned");
+		err = -6;
+	}
+	else if(! responseJ) {
+		AFB_API_ERROR(apiHandle,
+			      "Seems that %s call to api %s succeed but no response was returned",
+			      ALSACORE_REMOVECTL_VERB,
+			      ALSACORE_API);
+		err = -7;
+	}
+	else if(wrap_json_unpack(responseJ, "{s:{s:s}}", "removed", "ctlName", &removedControlName)) {
+		AFB_API_ERROR(apiHandle,
+			      "Can't get removed ALSA control name %s of %s api",
+			      ALSACORE_REMOVECTL_VERB,
+			      ALSACORE_API);
+		err = -8;
+	}
+
+	AFB_API_DEBUG(apiHandle, "Control %s successfully removed", removedControlName);
+
+	alsaCtlToDelete->alsaCtlProperties = NULL;
+
+	if(responseJ)
+		json_object_put(responseJ);
+
+	free(returnedError);
+	free(returnedInfo);
+
+	return err;
+}
+
 /*******************************************************************************
  *		Internals HAL - Alsacore controls request callback	       *
  ******************************************************************************/
diff --git a/src/4a-internals-hal/4a-internals-hal-alsacore-link.h b/src/4a-internals-hal/4a-internals-hal-alsacore-link.h
index 0694a81..39b535d 100644
--- a/src/4a-internals-hal/4a-internals-hal-alsacore-link.h
+++ b/src/4a-internals-hal/4a-internals-hal-alsacore-link.h
@@ -41,6 +41,7 @@
 #define ALSACORE_CTLGET_VERB				"ctlget"
 #define ALSACORE_CTLSET_VERB				"ctlset"
 #define ALSACORE_ADDCTL_VERB				"addcustomctl"
+#define ALSACORE_REMOVECTL_VERB				"removecustomctl"
 
 #define ALSACORE_CARD_CONTROL_EVENT_NAME		"controls"
 
@@ -78,6 +79,7 @@ int InternalHalUnsubscribeFromAlsacoreCardEvent(afb_api_t apiHandle, char *cardI
 int InternalHalUpdateAlsaCtlProperties(afb_api_t apiHandle, char *cardId, struct InternalHalAlsaCtl *currentAlsaCtl);
 int InternalHalSetAlsaCtlValue(afb_api_t apiHandle, char *cardId, int ctlId, json_object *valuesJ);
 int InternalHalCreateAlsaCtl(afb_api_t apiHandle, char *cardId, struct InternalHalAlsaCtl *alsaCtlToCreate);
+int InternalHalDeleteAlsaCtl(afb_api_t apiHandle, char *cardId, struct InternalHalAlsaCtl *alsaCtlToDelete);
 
 // Internals HAL alsacore controls request callback
 void InternalHalActionOnAlsaCtl(afb_req_t request);