SYS_FILE=/sys/class/gpio

mt_gpio_export()
{
   pin=$1
   let pin=pin+512   ### gpio base 512 ###

   if [ ! -f ${SYS_FILE}/export ]; then
       echo "${SYS_FILE}/export file is not present"
       exit 1
   fi

   echo "${pin}" > ${SYS_FILE}/export

   return 0   
}

mt_gpio_dir()
{
   pin=$1
   let pin=pin+512   ### gpio base 512 ###
   dir=$2
 
   if [ ! -f ${SYS_FILE}/gpio${pin}/direction ]; then
       echo "${SYS_FILE}/gpio${pin}/direction is not present"
       exit 1
   fi

   echo "${dir}" > ${SYS_FILE}/gpio${pin}/direction

   return 0   
}

mt_gpio_out()
{
   pin=$1
   let pin=pin+512   ### gpio base 512 ###
   out=$2
 
   if [ ! -f ${SYS_FILE}/gpio${pin}/value ]; then
       echo "${SYS_FILE}/gpio${pin}/value is not present"
       exit 1
   fi

   echo "${out}" > ${SYS_FILE}/gpio${pin}/value

   return 0   
}

mt_gpio_in()
{
   pin=$1
   let pin=pin+512   ### gpio base 512 ###
 
   if [ ! -f ${SYS_FILE}/gpio${pin}/value ]; then
       echo "${SYS_FILE}/gpio${pin}/value is not present"
       exit 1
   fi

   result=`cat ${SYS_FILE}/gpio${pin}/value`
   if [ ${result} == "0" ] ; then
       return 0
   else
       return 1
   fi
}