ardupilot/libraries/AP_Baro/AP_Baro.h

#ifndef __AP_BARO_H__
#define __AP_BARO_H__

class AP_Baro
{
    public:
    AP_Baro() {}
    virtual uint8_t read() = 0;
    virtual int32_t get_pressure() = 0;
    virtual int16_t get_temperature() = 0;
    virtual float   get_altitude() = 0;

    virtual int32_t get_raw_pressure() = 0;
    virtual int32_t get_raw_temp() = 0;
};

#include "AP_Baro_MS5611.h"
#include "AP_Baro_BMP085.h"
#include "AP_Baro_BMP085_hil.h"

#endif // __AP_BARO_H__