/**
 * \file
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 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
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 *
 * \brief PCF8574 i2c port expander driver.
 *
 * \author Francesco Sacchi <batt@develer.com>
 *
 * $WIZ$ module_name = "pcf8574"
 * $WIZ$ module_depends = "i2c"
 */

#ifndef DRV_PCF8574_H
#define DRV_PCF8574_H

#include "cfg/cfg_i2c.h"

#include <cfg/compiler.h>

#include <drv/i2c.h>

#if COMPILER_C99
	#define pcf8574_init(...)       PP_CAT(pcf8574_init ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
	#define pcf8574_get(...)        PP_CAT(pcf8574_get ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
	#define pcf8574_put(...)        PP_CAT(pcf8574_put ## _, COUNT_PARMS(__VA_ARGS__)) (__VA_ARGS__)
#else
	#define pcf8574_init(args...)   PP_CAT(pcf8574_init ## _, COUNT_PARMS(args)) (args)
	#define pcf8574_get(args...)    PP_CAT(pcf8574_get ## _, COUNT_PARMS(args)) (args)
	#define pcf8574_put(args...)    PP_CAT(pcf8574_put ## _, COUNT_PARMS(args)) (args)
#endif

typedef uint8_t pcf8574_addr;

/**
 * Context for accessing a PCF8574.
 */
typedef struct Pcf8574
{
	pcf8574_addr addr;
} Pcf8574;

#define PCF8574ID 0x40 ///< I2C address

/**
 * Read PCF8574 \a pcf bit status.
 * \return the pins status or EOF on errors.
 */
int pcf8574_get_2(I2c *i2c, Pcf8574 *pcf);

/**
 * Write to PCF8574 \a pcf port \a data.
 * \return true if ok, false on errors.
 */
bool pcf8574_put_3(I2c *i2c, Pcf8574 *pcf, uint8_t data);

/**
 * Init a PCF8574 on the bus with addr \a addr.
 * \return true if device is found, false otherwise.
 */
bool pcf8574_init_3(I2c *i2c, Pcf8574 *pcf, pcf8574_addr addr);

#if !CONFIG_I2C_DISABLE_OLD_API

DEPRECATED INLINE int pcf8574_get_1(Pcf8574 *pcf)
{
	return pcf8574_get_2(&local_i2c_old_api, pcf);
}

DEPRECATED INLINE bool pcf8574_put_2(Pcf8574 *pcf, uint8_t data)
{
	return pcf8574_put_3(&local_i2c_old_api, pcf, data);
}

DEPRECATED INLINE bool pcf8574_init_2(Pcf8574 *pcf, pcf8574_addr addr)
{
	return pcf8574_init_3(&local_i2c_old_api, pcf, addr);
}
#endif /* !CONFIG_I2C_DISABLE_OLD_API */

#endif /* DRV_PCF8574_H */