OpenWRT mr3020 Switchable configs on boot

init.d_modeswitch

#!/bin/sh /etc/rc.common
# filename: /etc/init.d/modeswitch

START=15
boot() {
        # process user commands
        [ -f /root/switchable_config.sh ] && {
                sh /root/switchable_config.sh
        }
}

Install Notes

1) Create the files /root/switchable_config.sh and /etc/init.d/modeswitch
2) /etc/init.d/modeswitch enable to enable the config

switchable_config.sh

#!/bin/sh
# filename: /root/switchable_config.sh

# Mode      GPIO18  GPIO20
#             sw1    sw2
# 3G           1      0
# WISP         0      1
# AP           1      1

dolog() {
  echo "$1"
  logger -t modeswitch "$1"
}

MODE="3g"
if grep -qe "sw2.*in  hi" /sys/kernel/debug/gpio ; then
  # sw2 is hi, so either WISP or AP mode

  if grep -qe "sw1.*in  hi" /sys/kernel/debug/gpio ; then
    MODE="ap"
  else
    MODE="wisp"
  fi
fi

dolog "Current switch mode: $MODE"

OLDMODE="unknown"
if [ -f /root/boot.switch_position ] ; then
  OLDMODE=$(cat /root/boot.switch_position)
fi

if [ "$OLDMODE" == "$MODE" ] ; then
  dolog "Mode is unchanged. Leaving configs unmodified."
else
  dolog "Mode has changed $OLDMODE -> $MODE"

  echo "$MODE" > /root/boot.switch_position

  DESTFILE="/root/boot.backup_$OLDMODE.tgz"
  dolog "Backing up old config to $DESTFILE"
  sysupgrade -b $DESTFILE

  ORIGINFILE="/root/boot.backup_$MODE.tgz"
  if [ -f "$ORIGINFILE" ] ; then
    dolog "Restoring previously saved config for $MODE ($ORIGINFILE)"
    sysupgrade -r $ORIGINFILE

    # needed to reapply potentially changed system level
    /etc/init.d/system restart
  else
    dolog "No previously saved config for $MODE. Inheriting config from $OLDMODE"
  fi
fi