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#!/bin/sh
# $Id: set_ftdi_lat 282 2010-04-24 12:08:32Z mueller $
#
# Usage: sudo $HOME/other/retro/trunk/bin/set_ftdi_lat USB0 1
#
#  Revision History: 
# Date         Rev Version  Comment
# 2010-04-24   282   1.0    fix filename for retrieving old latency
# 2010-04-24   281   0.9    Initial version
#

dev=${1:-USB0}
lat=${2:-1}

file="/sys/bus/usb-serial/devices/tty$dev/latency_timer"

if [ ! -r $file ]
then
  echo "set_ftdi_lat-E: device $dev not available"
  echo "   $file not found"
  exit 1
fi

if [ ! -w $file ]
then
  echo "set_ftdi_lat-E: parameters for $dev not writable"
  exit 1
fi

old=`cat $file`

echo "Set latency for tty$dev: old=$old new=$lat"

echo "$lat" > $file