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diff --git a/src/radio_impl.h b/src/radio_impl.h
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+/*
+ * Copyright (C) 2017 Konsulko Group
+ *
+ * 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 _RADIO_IMPL_H
+#define _RADIO_IMPL_H
+
+#include <stdint.h>
+
+typedef enum {
+	RADIO_BAND_UNSPECIFIED = 0,
+	RADIO_BAND_AM,
+	RADIO_BAND_FM
+} radio_band_t;
+
+typedef enum {
+	RADIO_SCAN_UNSPECIFIED = 0,
+	RADIO_SCAN_FORWARD,
+	RADIO_SCAN_BACKWARD
+} radio_scan_direction_t;
+
+typedef void (*radio_scan_callback_t)(uint32_t frequency, void *data);
+
+typedef void (*radio_freq_callback_t)(uint32_t frequency, void *data);
+
+typedef void (*radio_rds_callback_t)(void *rds_data, void *dat);
+
+typedef enum {
+	RADIO_MODE_UNSPECIFIED = 0,
+	RADIO_MODE_MONO,
+	RADIO_MODE_STEREO
+} radio_stereo_mode_t;
+
+/*
+ * AF_update
+ * true if quality belongs to an alternative frequency
+ *
+ * time_stamp
+ * if time_stamp is zero, quality data won't be valid
+ * reliability depending on time stamp
+ * it takes some time after tuning to get valid quality data
+ *
+ * rssi
+ * (signed)
+ * level detector result(RF input level)
+ *
+ * usn
+ * FM ultrasonic noise detector (relative usn detector result)
+ *
+ * bandwidth
+ * IF bandwidth
+ */
+typedef struct
+{
+	bool     af_update;
+	uint16_t time_stamp;
+	int16_t  rssi;
+	uint16_t usn;
+	uint16_t bandw;
+} station_quality_t;
+
+typedef struct {
+	char *name;
+
+	int (*probe)(void);
+
+	/* NOTE: init should return -1 if called before probe has been called and returned success */
+	int (*init)(void);
+
+	void (*set_output)(const char *output);
+
+	uint32_t (*get_frequency)(void);
+
+	void (*set_frequency)(uint32_t frequency);
+
+	void (*set_frequency_callback)(radio_freq_callback_t callback,
+				       void *data);
+
+	void (*set_rds_callback)(radio_rds_callback_t callback);
+
+	radio_band_t (*get_band)(void);
+
+	void (*set_band)(radio_band_t band);
+
+	int (*band_supported)(radio_band_t band);
+
+	uint32_t (*get_min_frequency)(radio_band_t band);
+
+	uint32_t (*get_max_frequency)(radio_band_t band);
+
+	uint32_t (*get_frequency_step)(radio_band_t band);
+
+	bool (*get_corking_state)(void);
+
+	void (*start)(void);
+
+	void (*stop)(void);
+
+	void (*scan_start)(radio_scan_direction_t direction,
+			   radio_scan_callback_t callback,
+			   void *data);
+
+	void (*scan_stop)(void);
+
+	radio_stereo_mode_t (*get_stereo_mode)(void);
+
+	void (*set_stereo_mode)(radio_stereo_mode_t mode);
+
+	char * (*get_rds_info)(void);
+
+	station_quality_t * (*get_quality_info)(void);
+
+	void (*set_alternative_frequency)(uint32_t frequency);
+} radio_impl_ops_t;
+
+#endif /* _RADIO_IMPL_H */