#!/bin/bash

# eetool v0.03 - script to ease programming of i2c eeproms using eeprog
# needs: eeprog, test, find, split, diff
# assumptions: /tmp is writable, eeprog is in cwd.
# (c) 2004-08-13 Christian van den Bosch <cjb@cjb.ie>
# released under GNU Public Licence (GPL) -
# see http://www.gnu.org/copyleft/gpl.html for details

nbytes=2048
if [ $# -ne 2 ]
then
  echo Usage: $0 w file : write specified file to eeprom, then verify.
  echo Usage: $0 v file : verify eeprom against specified file.
  echo Usage: $0 r file : read from eeprom to specified file.
  echo For write and verify, file is expected to exist and be $nbytes bytes.
  echo For read, file is expected not to exist, and will be created.
  exit 1
fi
cmd=$1
fn=$2

if [ "$cmd" == "w" -o "$cmd" == "v" ]
then
  # check that file we're writing to or verifying against eeprom exists and is right size
  if [ ! -f $fn ]
  then
    echo $0 exiting: $fn not found! 
    exit 1
  fi
  if [ `find $fn -printf "%s"` -ne 2048 ]
  then
    echo $0 exiting: $fn is wrong size! Should be $nbytes bytes.
    exit 1
  fi
elif [ "$cmd" == "r" ]
then
  if [ -f $fn ]
  then
    echo $0 exiting: $fn exists, will not overwrite.
    exit 1
  fi
else
  $0
  exit 1
fi
  
if [ "$cmd" == "w" ]
then
  split -b 256 $fn /tmp/w2k-part-$$-
  j=0
  progress=
  for i in a b c d e f g h
  do
    ./eeprog -f -w 0:0x100 /dev/i2c-0 0x5$j < /tmp/w2k-part-$$-a$i 2>>/tmp/w2k-err-$$
    progress=$progress$?
    echo -n .
    rm /tmp/w2k-part-$$-a$i
    let j=j+1
  done
  if [ "$progress" != "00000000" ]
  then
    echo " write failed; see /tmp/w2k-err-$$ for details."
    exit 1
  fi
  echo -n " write returned ok; verifying: "
  cmd=v
fi

if [ "$cmd" == "r" -o "$cmd" == "v" ]
then
  progress=
  for i in `seq 0 7`
  do
    ./eeprog -f -r 0:0x100 /dev/i2c-0 0x5$i >> /tmp/w2k-img-$$ 2>>/tmp/w2k-err-$$
    progress=$progress$?
    echo -n .
  done
  if [ $progress != 00000000 ]
  then
    echo " read failed; see /tmp/w2k-err-$$ for details."
    rm /tmp/w2k-img-$$
    exit 1
  fi

  if [ "$cmd" == "r" ]
  then
    mv /tmp/w2k-img-$$ $fn
    echo " read successful."
  else
    diff -b /tmp/w2k-img-$$ $fn
    if [ $? -eq 0 ]
    then
      echo " verify successful."
    else
      echo " verify FAILED!"
    fi
    rm /tmp/w2k-img-$$
  fi
fi

rm /tmp/w2k-err-$$