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341 kaklik 1 
/*****************************************************************************/
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/*
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 *  BoardController.cpp - communication with NGW100 Board controller
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 *
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 *      Copyright (C) 2007  Karel Hojdar
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 *
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 *      This program is free software; you can redistribute it and/or modify
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 *      it under the terms of the GNU General Public License as published by
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 *      the Free Software Foundation; either version 2 of the License, or
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 *      (at your option) any later version.
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 *
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 *      This program is distributed in the hope that it will be useful,
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 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *      GNU General Public License for more details.
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 *
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 *
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 *
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 *  Revision history
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 *    15.06.2007   1.0   Initial release
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 */
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/*****************************************************************************/
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#include <iostream>
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#include <getopt.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "linux/i2c-dev.h"
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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using namespace std;
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static char* version = "BoardController, version 0.1";
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static char* help = "Usage: BoardController [OPTION]\n  -I\t\tshow ID\n  -M\t\tshow model\n  -R\t\tshow revision\n  -S\t\tshow serial no.\n  -T\t\tshow temperature\n\n";
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#define I2C_SLAVE	0x0703	/* Change slave address			*/
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#define I2C_RDWR	0x0707	/* Combined R/W transfer (one stop only)*/
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#define BC_Addr	0x0B
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void DoExit(int ex)
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{
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	exit(ex);
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}
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unsigned char xfunc[5] = {0x99, 0x9A, 0x9B, 0x9E, 0x8D};
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unsigned char xlen[5] = {8, 6, 1, 15, 2};
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int main(int argc, char *argv[], char *envp[])
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{
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	char	*progname;
345 kaklik 60 
	int c, func = 0, Len;
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	int	i2cbus = 0;
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	char filename[20], Buf[64];
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	int file;
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	progname = strrchr(argv[0], '/');
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	progname = progname ? progname + 1 : argv[0];
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	while ((c = getopt (argc, argv, "IiMmRrSsTth")) != -1)
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		switch (c)
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		{
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		case 'I':
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		case 'i':
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			func = 0;
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			break;
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		case 'M':
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		case 'm':
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			func = 1;
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			break;
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		case 'R':
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		case 'r':
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			func = 2;
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			break;
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		case 'S':
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		case 's':
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			func = 3;
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			break;
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		case 'T':
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		case 't':
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			func = 4;
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			break;
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		case 'h':
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			printf ("%s\n%s", version, help);
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			return 1;
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		case '?':
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			printf ("Unknown option `-%c', try %s -h.\n", optopt,progname);
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			return 1;
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		}
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	sprintf(filename, "/dev/i2c-%d", i2cbus);
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	file = open(filename, O_RDWR);
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	if (file < 0)
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	{
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		cerr << "Could not open /dev/i2c-0." << endl;
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		return -1;
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	}
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	if (ioctl(file, I2C_SLAVE, BC_Addr) == -1)
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	{
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		fprintf(stderr, "Failed to set address to 0x%02x.\n", BC_Addr);
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		DoExit(-2);
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	}
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	int Loops = 0;
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	do
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	{
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		Buf[0] = xfunc[func];
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		if ( write(file, Buf, 1) != 1)
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		{
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			fprintf(stderr, "Failed to write byte to address to 0x%02x, errno %i.\n", BC_Addr, errno);
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			DoExit(-3);
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		}
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		if (read(file, Buf, 1) != 1)
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		{
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			fprintf(stderr, "Failed to read response length, errno %i.\n", errno);
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			DoExit(-4);
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		}
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		Len = Buf[0];
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		if (read(file, Buf, Len) != Len)
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		{
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			fprintf(stderr, "Failed to read response, errno %i.\n", errno);
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			DoExit(-5);
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		}
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		Loops++;
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	} while (Len != xlen[func]);
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	if (Loops > 1)
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		fprintf(stderr, "After %i attempts got: \n", Loops);
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	switch (func)
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	{
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		case 0:
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			Buf[Len] = 0x00;
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			fprintf(stdout, "Board ID is %s.\n", Buf);
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			break;
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		case 1:
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			Buf[Len] = 0x00;
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			fprintf(stdout, "Model of the board is %s.\n", Buf);
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			break;
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		case 2:
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			fprintf(stdout, "Revision of the board is 0x%02X.\n", Buf[0]);
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			break;
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		case 3:
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			Buf[Len] = 0x00;
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			fprintf(stdout, "Serial number of the board is %s.\n", Buf);
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			break;
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		case 4:
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			fprintf(stdout, "Temperature is %i or %i.\n", (Buf[0] << 8) + Buf[1], (Buf[1] << 8) + Buf[0]);
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			break;
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	}
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	close(file);
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	return 0;
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}