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/*
ozedit.c - A user-space program to read/write to the oz263
chip in the ASUS Digimatrix.
Copyright (c) 2006 Andrew Calkin <calkina@geexbox.org>
Based heavily on code by
Copyright (c) 2005 Richard Taylor <richard@artaylor.co.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <unistd.h>
#include <time.h>
#include "digitools.h"
#include "oz263.h"
static int axtoi(char *hexstg)
{
int n = 0; /* position in string */
int m = 0; /* position in digit[] to shift */
int count; /* loop index */
int intvalue = 0; /* integer value of hex string */
int digit[5]; /* hold values to convert */
while (n < 4)
{
if (hexstg[n]=='\0')
break;
if (hexstg[n] > 0x29 && hexstg[n] < 0x40 ) /*if 0 to 9 */
digit[n] = hexstg[n] & 0x0f; /* convert to int */
else if (hexstg[n] >='a' && hexstg[n] <= 'f') /* if a to f */
digit[n] = (hexstg[n] & 0x0f) + 9; /* convert to int */
else if (hexstg[n] >='A' && hexstg[n] <= 'F') /* if A to F */
digit[n] = (hexstg[n] & 0x0f) + 9; /* convert to int */
else
break;
n++;
}
count = n;
m = n - 1;
n = 0;
while(n < count)
{
/* digit[n] is value of hex digit at position n
(m << 2) is the number of positions to shift
OR the bits into return value */
intvalue = intvalue | (digit[n] << (m << 2));
m--; /* adjust the position to set */
n++; /* next digit to process */
}
return intvalue;
}
static void ozedit_help(char *argv0)
{
#ifndef SILENT
printf(
"\n"
"Usage: %s [OPTIONS]\n"
"\n"
" WARNING!: This program affects the oz263 chip, which is\n"
" yet to have any specifications released. Modifications made with\n"
" this program may leave your chip in an unrecoverable state, or\n"
" otherwise cause some hardware failure. Use at your own risk!\n\n"
"\n"
" This program needs to be run as root.\n"
"\n"
" -m, --manual Allows you to interactively change a register.\n"
" -r, --read Allows you to interactively read a register.\n"
"\n"
" -v, --version Print version number.\n"
" -h, --help Display this help message.\n"
"\n", argv0);
#endif
}
static struct option ozedit_longopts[] = {
{ "manual", 0, 0, 'm' },
{ "read", 0, 0, 'r' },
{ "version", 0, 0, 'v' },
{ "help", 0, 0, 'h' },
{ NULL, 0, 0, 0 }
};
int ozedit_main(int argc, char *argv[])
{
extern int file;
int ch, longindex = 0;
char buffer[20], *ptr;
if ( (int)getuid() != 0)
{
#ifndef SILENT
fprintf(stderr,"Must be root to run this program!\n");
#endif
return -1;
}
if (argc == 1)
{
#ifndef SILENT
printf("\nPlease supply some parameters.\n"
"Use %s -h for list.\n\n", argv[0]);
#endif
return 1;
}
/* Parse input params */
for (;;)
{
if ((ch = getopt_long(argc, argv, "mrvh",
ozedit_longopts, &longindex)) == -1)
break;
switch (ch)
{
case 'v':
#ifndef SILENT
printf("ASUS DigiMatrix ozedit oz263 R&D tool, from "
"DigiTools Version %s\n", DIGI_VER);
#endif
break;
case 'h':
ozedit_help(argv[0]);
return 0;
break;
case 'r':
if (!file)
file=oz263_I2C_init();
printf("Entering interactive read mode. Press enter to exit\n");
printf("Please enter \"REG\"\n");
printf("Where REG is a hexadecimal value (without 0x).\n");
while (buffer[0] != '\n')
{
/* Get at most 20 bytes from user */
if (fgets(buffer, 20, stdin))
{
if (axtoi(buffer) > 0x45 )
printf("Write forbidden - the I2C bus will lock up!\n");
else
{
oz263_write_byte(file, axtoi(buffer));
printf("Read back: 0x%X = 0x%X\n",
axtoi(buffer), oz263_read_byte(file));
}
}
}
break;
case 'm':
if (!file)
file=oz263_I2C_init();
printf("Entering interactive write mode. Press enter to exit\n");
printf("Please enter \"REG VALUE\"\n");
printf("Where REG and VALUE are hexadecimal values "
"(without 0x).\n");
while (buffer[0] != '\n')
{
/* Get at most 20 bytes from user */
if (fgets(buffer, 20, stdin))
{
if (axtoi(buffer) > 0x45)
printf("Write forbidden - the I2C bus will lock up!\n");
else
{
/* Find the start of the data value */
ptr = strstr(buffer, " ");
if (ptr)
{
printf("0x%X = 0x%X ", axtoi(buffer), axtoi(ptr));
oz263_write_byte_data(file, axtoi(buffer), axtoi(ptr));
printf("Read back: 0x%0X\n", oz263_read_byte(file));
}
}
}
}
break;
default:
ozedit_help(argv[0]);
break;
}
}
return 0;
}
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