Add value normalization of alsa control values

Add functions that allows to normalize values that are requested
to be sent with an alsa set control call (using alsacore).

Change-Id: I5046a66d807c9b9b6751e036a47303ceddc0c16a
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>

1 files changed, 34 insertions, 0 deletions

diff --git a/4a-hal/4a-hal-controllers/4a-hal-controllers-value-handler.h b/4a-hal/4a-hal-controllers/4a-hal-controllers-value-handler.h
new file mode 100644
index 0000000..5f91aaa
--- /dev/null
+++ b/4a-hal/4a-hal-controllers/4a-hal-controllers-value-handler.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2018 "IoT.bzh"
+ * Author Jonathan Aillet <jonathan.aillet@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _HAL_CTLS_VALUE_NORMALIZATION_INCLUDE_
+#define _HAL_CTLS_VALUE_NORMALIZATION_INCLUDE_
+
+#include <stdio.h>
+
+#include <wrap-json.h>
+
+#include "4a-hal-controllers-alsacore-link.h"
+
+// Simple conversion value to/from percentage functions
+int HalCtlsConvertValueToPercentage(double val, double min, double max);
+int HalCtlsConvertPercentageToValue(int percentage, int min, int max);
+
+// Convert json object from percentage to value
+int HalCtlsNormalizeJsonValues(AFB_ApiT apiHandle, struct CtlHalAlsaCtlProperties *alsaCtlProperties, json_object *toConvertJ, json_object ** ConvertedJ);
+
+#endif /* _HAL_CTLS_VALUE_NORMALIZATION_INCLUDE_ */
\ No newline at end of file