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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 * 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.
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 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
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/**
 * @file I2C.hpp
 *
 * Base class for devices connected via I2C.
 */

#ifndef _DEVICE_I2C_H
#define _DEVICE_I2C_H

#include "../CDev.hpp"

struct I2CSPIDriverConfig;

namespace device __EXPORT
{

/**
 * Abstract class for character device on I2C
 */
class __EXPORT I2C : public CDev
{

public:

	// no copy, assignment, move, move assignment
	I2C(const I2C &) = delete;
	I2C &operator=(const I2C &) = delete;
	I2C(I2C &&) = delete;
	I2C &operator=(I2C &&) = delete;

	virtual int	init() override;

protected:
	/**
	 * The number of times a read or write operation will be retried on
	 * error.
	 */
	uint8_t		_retries{0};

	/**
	 * @ Constructor
	 *
	 * @param device_type	The device type (see drv_sensor.h)
	 * @param name		Driver name
	 * @param bus		I2C bus on which the device lives
	 * @param address	I2C bus address, or zero if set_address will be used
	 * @param frequency	I2C bus frequency for the device (currently not used)
	 */
	I2C(uint8_t device_type, const char *name, const int bus, const uint16_t address, const uint32_t frequency);
	I2C(const I2CSPIDriverConfig &config);
	virtual ~I2C();

	/**
	 * Check for the presence of the device on the bus.
	 */
	virtual int	probe() { return PX4_OK; }

	/**
	 * Perform an I2C transaction to the device.
	 *
	 * At least one of send_len and recv_len must be non-zero.
	 *
	 * @param send		Pointer to bytes to send.
	 * @param send_len	Number of bytes to send.
	 * @param recv		Pointer to buffer for bytes received.
	 * @param recv_len	Number of bytes to receive.
	 * @return		OK if the transfer was successful, -errno
	 *			otherwise.
	 */
	int		transfer(const uint8_t *send, const unsigned send_len, uint8_t *recv, const unsigned recv_len);

	virtual bool	external() const override { return px4_i2c_bus_external(_device_id.devid_s.bus); }

private:
	uint32_t		_frequency{0};
	int			_fd{-1};

};

} // namespace device

#endif /* _DEVICE_I2C_H */