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diff --git a/hal-interface.h b/hal-interface.h
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+/*
+ * AlsaLibMapping -- provide low level interface with AUDIO lib (extracted from alsa-json-gateway code)
+ * Copyright (C) 2015,2016,2017, Fulup Ar Foll fulup@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_INTERFACE_H
+#define HAL_INTERFACE_H
+
+#include <stdio.h>
+#include <alsa/asoundlib.h>
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+#include "hal-statics.h"
+#include <systemd/sd-event.h>
+#include <json-c/json.h>
+
+
+typedef enum {
+    ACTION_SET,
+    ACTION_GET
+} ActionSetGetT;
+
+// VolRamp Handle Store current status for a given VolRam CB set
+
+typedef struct {
+    halRampEnumT mode;
+    halCtlsTagT slave;
+    int delay; // delay between volset in us
+    int stepDown; // linear %
+    int stepUp; // linear %
+    int current; // current volume for slave ctl
+    int target; // target volume
+    sd_event_source *evtsrc; // event loop timer source
+} halVolRampT;
+
+typedef struct {
+    int min;
+    int max;
+    int step;
+    int mute;
+} alsaHalDBscaleT;
+
+typedef struct {
+    char* name;
+    int numid;
+    snd_ctl_elem_type_t type;
+    int count;
+    int minval;
+    int maxval;
+    int value;
+    int step;
+    const char **enums;
+    alsaHalDBscaleT *dbscale;
+} alsaHalCtlMapT;
+
+
+// avoid compiler warning [Jose does not like typedef :) ]
+typedef struct afb_service alsaHalServiceT;
+
+typedef struct {
+    void (*callback)(halCtlsTagT tag, alsaHalCtlMapT *control, void* handle, json_object *valuesJ);
+    void* handle;
+} alsaHalCbMapT;
+
+typedef struct {
+    halCtlsTagT tag;
+    const char *label;
+    alsaHalCtlMapT ctl;
+    alsaHalCbMapT cb;
+    char* info;
+} alsaHalMapT;
+
+typedef struct {
+    const char *name;
+    const char *info;
+    alsaHalMapT *ctls;
+    const char *devid;
+    json_object* (*volumeCB)(ActionSetGetT action, const alsaHalCtlMapT *halCtls, json_object *valuesJ);
+} alsaHalSndCardT;
+
+// hal-interface.c
+extern afb_verb_v2 halServiceApi[];
+PUBLIC void halServiceEvent(const char *evtname, json_object *object);
+PUBLIC int halServiceInit(const char *apiPrefix, alsaHalSndCardT *alsaHalSndCard);
+PUBLIC json_object *halGetCtlByTag(halRampEnumT tag);
+PUBLIC int halSetCtlByTag(halRampEnumT tag, int value);
+
+
+// hal-volramp.c
+PUBLIC void volumeRamp(halCtlsTagT halTag, alsaHalCtlMapT *control, void* handle, json_object *valJ);
+
+// hal-volume.c
+PUBLIC json_object *volumeNormalise(ActionSetGetT action, const alsaHalCtlMapT *halCtls, json_object *valuesJ);
+
+
+#endif /* HAL_INTERFACE_H */
+