/****************************************************************************
 *
 *   Copyright (C) 2013 PX4 Development Team. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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 ****************************************************************************/

/**
 * @file Airspeed driver interface.
 */

#ifndef _DRV_AIRSPEED_H
#define _DRV_AIRSPEED_H

#include <stdint.h>
#include <sys/ioctl.h>

#include "drv_sensor.h"
#include "drv_orb_dev.h"

#define AIRSPEED_DEVICE_PATH	"/dev/airspeed"

/**
 * Airspeed report structure.  Reads from the device must be in multiples of this
 * structure.
 */
struct airspeed_report {
	uint64_t timestamp;
	uint8_t speed; 			/** in meters/sec */
};

/*
 * ObjDev tag for raw range finder data.
 */
ORB_DECLARE(sensor_differential_pressure);

/*
 * ioctl() definitions
 *
 * Airspeed drivers also implement the generic sensor driver
 * interfaces from drv_sensor.h
 */

#define _AIRSPEEDIOCBASE			(0x7700)
#define __AIRSPEEDIOC(_n)		(_IOC(_AIRSPEEDIOCBASE, _n))


#endif /* _DRV_AIRSPEED_H */

Add in the missing header.
Add in the missing header.
