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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