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#!/usr/bin/perl
# monitor-edid
# Copyright (C) 2005-2008 Mandriva
#
# This program 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
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
use Getopt::Long;
my %opt = ('acpi-dir' => "/proc/acpi/video");
my @common_options = ('verbose', 'try-in-console', 'no-vbe', 'acpi-dir=s', 'vbe-port=i', 'max-vbe-port=i');
my $common_options_usage = '[-v] [--acpi-dir <dir>] [--try-in-console] [--vbe-port <0-3>] [--max-vbe-port <0-3>]';
if ($0 =~ /monitor-get-edid/) {
GetOptions_(@common_options) or die "usage: monitor-get-edid $common_options_usage\n";
if (my @edids = get_edids(1)) {
print $edids[0][1];
exit 0;
} else {
exit 1;
}
} else {
GetOptions_(@common_options, 'MonitorsDB', 'perl')
or die "usage: monitor-edid $common_options_usage [--perl] [--MonitorsDB]\n";
my $err = 1;
if (my @edids = get_edids()) {
print "(\n" if $opt{perl};
foreach (@edids) {
my ($f, $edid) = @$_;
warn "parsing EDID from $f\n" if $opt{verbose};
if ($f =~ m!^/!) {
system(parse_edid() . " $f");
$err = 0 if $? == 0;
} else {
open(my $F, '|' . parse_edid());
print $F $edid;
close $F and $err = 0;
}
print ",\n" if $opt{perl};
}
print ")\n" if $opt{perl};
}
exit $err;
}
sub GetOptions_ {
my (@l) = @_;
GetOptions('v' => \$opt{verbose}, map { $_ => \$opt{/([^=]*)/ && $1} } @l);
}
sub propagate_options {
my (@l) = @_;
map { $_ eq 'verbose' ? '-v' : "--$_" } grep { $opt{$_} } @l;
}
sub get_using_vbe() {
my $prog = '/usr/sbin/monitor-get-edid-using-vbe';
-x $prog && join(' ', $prog, propagate_options('verbose', 'try-in-console'));
}
sub parse_edid() {
join(' ', 'monitor-parse-edid', propagate_options('verbose', 'MonitorsDB', 'perl'));
}
sub get_edids {
my ($b_get_first) = @_;
my @l = map {
my $s = slurp($_);
is_edid_possibly_valid($s) ? [ $_ => $s ] : ();
} get_edid_files();
if (!@l || !$b_get_first && $< == 0) {
if (my $cmd = get_using_vbe()) {
my $min_port = $opt{'vbe-port'} || 0;
my $max_port = $opt{'max-vbe-port'} || $opt{'vbe-port'} || 2;
foreach my $port ($min_port .. $max_port) {
warn "probing EDID using VBE (port $port)\n" if $opt{verbose};
my $edid = `$cmd --port $port`;
is_edid_possibly_valid($edid) or next;
if (grep { $_->[1] eq $edid } @l) {
# already found, forget it
} else {
push @l, [ vbe => $edid ];
last;
}
}
}
}
@l;
}
sub get_edid_files() {
my @l1 = find_EDID("/proc/device-tree");
my @l2 = grep {
(my $state_f = $_) =~ s/EDID$/state/;
my ($state) = slurp($state_f) =~ /state:\s*0x(\w+)/;
hex($state) & 2; # bit 1 is "Output is activated"
} find_EDID($opt{'acpi-dir'});
my @l3 = grep {
(my $state_f = $_) =~ s/edid$/enabled/;
slurp($state_f) =~ /enabled/;
} glob("/sys/class/drm/card*-*/edid");
(@l1, @l2, @l3);
}
sub find_EDID {
my ($dir) = @_;
my @l;
require File::Find;
File::Find::find(sub { $_ eq 'EDID' and push @l, $File::Find::name }, $dir);
@l;
}
sub is_edid_possibly_valid {
my ($edid) = @_;
length($edid) >= 128;
}
sub slurp {
my ($f) = @_;
open(my $F, '<', $f) or return;
local $/;
scalar <$F>;
}
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