#include "globals.h"
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <glib.h>


#define I2C_BUS "/dev/i2c-3"

gboolean write_error_flagged;
gboolean read_error_flagged;


void I2C_Write(gulong address, guchar value)
{

	struct i2c_smbus_ioctl_data argswrite;

	argswrite.read_write = I2C_SMBUS_WRITE;
	argswrite.size = I2C_SMBUS_BYTE;
	argswrite.data = NULL;
	argswrite.command = value;

	int device = open(I2C_BUS, O_RDWR);

	if ((device == -1) && !write_error_flagged) {
		write_error_flagged = TRUE;
		g_print_debug("ERROR: could not open I2C bus %s for writing\n", I2C_BUS);
		return;
	}

	ioctl(device, I2C_SLAVE, address);
	ioctl(device, I2C_SMBUS, &argswrite);

	close(device);
}


guchar I2C_Read(gulong address)
{

	union i2c_smbus_data data;
	struct i2c_smbus_ioctl_data argsread;

	argsread.read_write = I2C_SMBUS_READ;
	argsread.size = I2C_SMBUS_BYTE;
	argsread.data = &data;
	argsread.command = 0;

	int device = open(I2C_BUS, O_RDWR);

	if ((device == -1) && !read_error_flagged) {
		read_error_flagged = TRUE;
		g_print_debug("ERROR: could not open I2C bus %s for reading\n", I2C_BUS);
		return 0;
	}

	ioctl(device, I2C_SLAVE, address);
	ioctl(device, I2C_SMBUS, &argsread);

	close(device);

	return data.byte;
}