#!/bin/sh
#
# Load puzzlefw kernel driver.
#

start() {

    # Check that the FPGA is running.
    # If the PuzzleFW firmware is not running on the FPGA,
    # attempting to load the driver will crash the system.
    read fpga_state </sys/class/fpga_manager/fpga0/state
    if [ "$fpga_state" != "operating" ]; then
        echo "ERROR: FPGA not operating" >&2
        exit 1
    fi

    # Check that the FPGA has finished reset.
    # If the FPGA is in reset, loading the driver will crash the system.
    reset_done="$(gpioget 0 55)"
    if [ "$reset_done" -ne 1 ]; then
        echo "ERROR: FPGA in reset" >&2
        exit 1
    fi

    # Load module.
    echo "Loading puzzlefw driver ..."
    insmod /opt/puzzlefw/driver/puzzlefw.ko
}

stop() {
    echo -n "Unloading puzzlefw driver ..."
    rmmod puzzlefw
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  restart|reload)
    stop
    start
    ;;
  *)
    echo "Usage: $0 {start|stop|restart}"
    exit 1
esac