#!/bin/bash
lna3_chat_link=/etc/ppp/peers/lna3_chat
lna3_readme=/etc/ppp/peers/README.lna3
function usage {
>&2 echo "\
Usage: $0 <image_id> [timeout]
    image_id <0|1|-1>  : for dual FW image SKU-s, the id of the image to switch to
                       (LTE910-NA1 is the only supported radio for now).
                       -1 is based on SIM
    timeout            : wait time for radio to come up if set (default : 15 sec)
    
"
    exit 1
}

if [ $# -gt 2 ] ; then
    usage
fi

#
# Load args (don't wait for the radio by default)
#
FWIMAGE=$1
if ((FWIMAGE < -2)) || ((FWIMAGE > 1)) ; then
    usage
fi
if ! >&2 /usr/sbin/mlinux-cell-radio-ready ; then
    [ "$VERBOSE" ] && >&2 echo Radio is not ready
    [ "$VERBOSE" ] && >&2 echo Try again later
    exit 1
fi
if ((FWIMAGE == -1)) ; then
    iccid=$(radio-query --iccid)
    if (($? == 0)); then
        if ((${#iccid} == 0)) ; then
            [ "$VERBOSE" ] && >&2 echo "No carrier.  Maybe no SIM?"
            [ "$VERBOSE" ] && >&2 echo "ERROR: Cannot decide on firmware"
            exit 1
        fi
        if [[ "$iccid" =~ ^89148.* ]] ; then
            ((FWIMAGE=1))
        else
            ((FWIMAGE=0))
        fi
    else
       >&2 echo "Cannot get ICCID from SIM"
       >&2 echo "Try again later"
       exit 1
    fi
fi
    

TIMEOUT=${2:-15}
if [ "$VERBOSE" != "yes" ]; then
  VERBOSE=""
fi

[ "$VERBOSE" ] && >&2 echo -n "Switching the radio firmware image: "

#
# Check if the radio present
#
MODEL=$(radio-query --model)
if [ $? -ne 0 ]; then
  [ "$VERBOSE" ] && >&2 echo "Assume no radio on this device."
  exit 0
fi

#
# Applicable for LTE910-NA1 with dual FW images only
#
productid=$(/usr/sbin/mts-io-sysfs show product-id)
if [[ $MODEL != LE910-NA1 ]] || ! [[ $productid =~ -LNA3- ]] ; then
  [ "$VERBOSE" ] && >&2 echo "Firmware switch is supported only on LE910-NA1 models with product-id containing -LNA3-."
  exit 0
fi

#
# Check if firmware switch is required
#
FWACTIVE=$(radio-query --active-firmware)
if [ $? -ne 0 ] || [ "$FWACTIVE" == "" ]; then
  [ "$VERBOSE" ] && >&2 echo "The $MODEL radio does not support firmware switching."
  exit 0
fi

if (( FWACTIVE == FWIMAGE )); then
  echo "Cellular radio firmware has already been switched to $FWIMAGE image."
  exit 0
fi

# Disable the LNA3 chat script in case of failure.
if ! [[ -L $lna3_chat_link ]] || [[ $(basename $(readlink -f $lna3_chat_link)) != README.lna3 ]] ; then
  ln -sf "${lna3_readme}" "${lna3_chat_link}"
  echo "Chat script is now disabled."
fi

#
# Switch the firmware
#
RESULT=$(radio-cmd --set-active-firmware "$FWIMAGE")
if [ $? -ne 0 ]; then
  [ "$VERBOSE" ] && >&2 echo "$RESULT"
  exit 1
fi


#
# Exit if no TIMEOUT set
#
# This is somewhat dangerous in that we assume the radio
# will switch.
if ((TIMEOUT == 0)) ; then
   if ((FWIMAGE == 0)) ; then
     [ "$VERBOSE" ] && >&2 echo "Use mlinux-switch-apn to switch the APN when the radio is ready, before dialing"
     exit 0
   fi
fi
# 
#
# Wait for the radio to be ready before continuing
#
COUNTER=0

[ "$VERBOSE" ] && echo -n "Wait..."

#
# Give it some time
#
sleep 5

while [ $COUNTER -lt $TIMEOUT ]; do
  MODEL=$(radio-query --model)
  if [ $? -eq 0 ]; then
    echo "Cellular radio firmware has been switched to $FWIMAGE image."
    exit 0
  fi

  let COUNTER=COUNTER+1

  [ "$VERBOSE" ] && echo -n "."

  sleep 1
done

>&2 echo "Cellular radio is not ready."
>&2 echo "When it becomes ready, invoke /usr/sbin/mlinux-switch-apn"
>&2 echo "to set the APN"
exit 1