#!/usr/bin/perl

#########################################################################################
# Description:  Perform GPIO export & interrupt setting for HiPi::Wiring
# Created       Sat Feb 23 20:29:22 2013
# svn id        $Id:$
# Copyright:    Copyright (c) 2013 Mark Dootson
# Licence:      This work is free software; you can redistribute it and/or modify it 
#               under the terms of the GNU General Public License as published by the 
#               Free Software Foundation; either version 3 of the License, or any later 
#               version.
#########################################################################################

use 5.14.0;
use strict;
use warnings;
use HiPi::Wiring;
use Fcntl;

my($action, $wiringpinno, $intmode ) = @ARGV;

if($action ne 'edge' ) {
    die 'Incorrect calling convention';
}

our ($confirmedmode, $gpiopin);

if( $intmode =~ /^(none|falling|rising|both)$/ ) {
    $confirmedmode = $1;
} else {
    die qq(Incorrect interrupt mode : $intmode);
}

$gpiopin = HiPi::Wiring::wpiPinToGpio($wiringpinno);

#---------------------------------------------------
# Export the pin and set direction to input
#---------------------------------------------------

my ($expfh, $edgfh, $dirfh);
my $expfile = qq(/sys/class/gpio/export);
my $pindir  = qq(/sys/class/gpio/gpio${gpiopin});
my $dirfile = qq($pindir/direction);
my $edgfile = qq($pindir/edge);
my $valfile = qq($pindir/value);
my $actfile = qq($pindir/active_low);

unless( -d $pindir && -f $dirfile && -f $edgfile && -f $valfile) {
    sysopen($expfh, $expfile, O_WRONLY ) or die qq(failed to open sysfs export file for pin $gpiopin : $!);
    syswrite($expfh, $gpiopin);
    close($expfh);
    sysopen($dirfh, $dirfile, O_WRONLY ) or die qq(failed to open sysfs direction file for pin $gpiopin : $!);
    syswrite($dirfh, 'in');
    close($dirfh);
}

#---------------------------------------------------
# Set Interrupt
#---------------------------------------------------

sysopen($edgfh, $dirfile, O_WRONLY ) or die qq(failed to open sysfs edge file for pin $gpiopin : $!);
syswrite($edgfh, $confirmedmode);
close($edgfh);

#-----------------------------------------------------
# check permissions files need to be rw for gpio group
#-----------------------------------------------------

for my $filepath ( $dirfile.  )

1;
