#!/usr/bin/perl
use warnings;
use strict;

# http://blogs.gnome.org/dcbw/2010/04/15/mobile-broadband-and-qualcomm-proprietary-protocols/
# http://cgit.freedesktop.org/ModemManager/ModemManager/tree/libqcdm/src/utils.c

use Device::SerialPort;
use Data::Dump qw(dump);

my @crc_table = (
    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
    0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
    0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
    0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
    0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
    0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
    0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
    0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
    0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
    0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
    0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
    0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
    0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
    0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
    0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
    0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
    0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
    0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
    0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
    0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
    0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
    0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
    0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
    0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
    0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
    0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
    0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
    0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
    0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
    0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
);

sub crc {
	my $crc = 0xffff;
	foreach my $byte ( split(//, join('',@_)) ) {
		$crc = ($crc >> 8) ^ $crc_table[ ($crc ^ ord($byte)) & 0xff ];
	}
	return $crc ^ 0xffff;
}



my $device = $ENV{DEVICE} || '/dev/ttyUSB2'; # last device! control port!

my $port = Device::SerialPort->new( $device ) || die "$device: $!";
$port->baudrate(115200) || die "fail $device baudrate";
$port->parity("none") || die "fail $device parity";
$port->databits(8)    || die "fail $device databits";
$port->stopbits(1)    || die "fail $device stopbits";
$port->handshake("rts")  || die "fail $device handshake";

$port->write_settings || die "no $device settings";

$port->user_msg(1);
$port->error_msg(1);
$port->debug(1);

$port->read_char_time(3000);  # 5 s char timeout
$port->read_const_time(3000); # 1 s read timeout

while ( my $drain = $port->input ) {
	warn "# drain $drain\n";

	$port->write('AT$QCDMG' . "\r");
	warn "DIAG mode: ", $port->read(2), $port->input; # OK+cr/lf

}

my $diag = {
      GET_VERSION => 0,
      GET_SERIAL_NUMBER => 1,
      READ_VOLATILE_B => 2,
      READ_VOLATILE_W => 3,
      READ_VOLATILE_D => 4,
      WRITE_VOLATILE_B => 5,
      WRITE_VOLATILE_W => 6,
      WRITE_VOLATILE_D => 7,
      GET_STATUS => 12,
      LOG_REQUEST => 16,
      READ_NON_VOLATILE => 17,
      GET_DIAG_VERSION => 28,
      TIMESTAMP => 29,
      GET_MESSAGE => 31,
      CHANGE_MODE => 41,
      SWITCH_TO_DL_MODE => 58,
      EXTENDED_BUILD_ID => 124,
};

warn "## using $device\n";

sub as_hex {
    my @out;
    foreach my $str ( @_ ) {
        my $hex = uc unpack( 'H*', $str );
        $hex =~ s/(..)/$1 /g if length( $str ) > 2;
        $hex =~ s/\s+$//;
        push @out, $hex;
    }
    return join(' | ', @out) . "  " . dump(@_);
}


sub diag {
	my ($cmd,$message) = @_;
	die "unknown $cmd" unless exists $diag->{$cmd};
	my $nr = $diag->{$cmd};

	my $data = chr($nr);

	my $crc = pack('v', crc($data) );

	$data =~ s/\x7d/\x7d\x5d/gs;
	$data =~ s/\x7e/\x7d\x5e/gs;

	my $out = $data . $crc . "\x7e";

	print STDERR ">>> $cmd >>> ",as_hex($out),$/;
	$port->write($out);
#	$port->write_done(1); # flush
	$port->write_drain;

	block_read();

}

sub block_read {

	my $ret = $port->read(1);
	while ( my $c = $port->input ) {
		print STDERR "<<< ",as_hex($ret . $c), $/;
		$ret .= $c;
#		last if $c =~ m/^OK\r/;
	}
	$ret =~ s/\x7d\x5d/\x7d/gs;
	$ret =~ s/\x7d\x5e/\x7e/gs;
	return $ret;
}

diag 'GET_VERSION';

diag 'GET_SERIAL_NUMBER';

diag 'EXTENDED_BUILD_ID';

$port->close || die "can't close port $!";

warn "## $device closed\n";

