--- /dev/null
+#!/usr/bin/perl
+use strict;
+
+# Copyright (C) 2010 Mauro Carvalho Chehab <mchehab@redhat.com>
+#
+# 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, version 2 of the License.
+#
+# 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.
+#
+# This small script parses USB dumps generated by several drivers,
+# decoding USB bits.
+#
+# To use it, do:
+# dmesg | ./parse_usb.pl
+#
+# Also, there are other utilities that produce similar outputs, and it
+# is not hard to parse some USB analyzers log into the expected format.
+#
+
+sub i2c_reg($)
+{
+ my %decode;
+ my $reg = shift;
+
+ $reg =~ s/\s+.*//;
+ $reg = hex("$reg");
+
+ if ($reg & 0x01) {
+ $decode{"speed"} = "400kbps";
+ } else {
+ $decode{"speed"} = "100kbps";
+ }
+ if ($reg & 0x02) {
+ $decode{"op"} = "RD";
+ } else {
+ $decode{"op"} = "WR";
+ }
+ $decode{"busy"} = "BUSY" if (($reg & 0x04) == 0);
+ $decode{"err"} = "ERR" if ($reg & 0x08);
+ $decode{"size"} = ($reg >> 4) & 7;
+ $decode{"i2c"} = "3wire" if (($reg & 0x80) == 0);
+
+ return %decode;
+}
+
+sub type_req($)
+{
+ my $reqtype = shift;
+ my $s;
+
+ if ($reqtype & 0x80) {
+ $s = "RD ";
+ } else {
+ $s = "WR ";
+ }
+ if (($reqtype & 0x60) == 0x20) {
+ $s .= "CLAS ";
+ } elsif (($reqtype & 0x60) == 0x40) {
+ $s .= "VEND ";
+ } elsif (($reqtype & 0x60) == 0x60) {
+ $s .= "RSVD ";
+ }
+
+ if (($reqtype & 0x1f) == 0x00) {
+ $s .= "DEV ";
+ } elsif (($reqtype & 0x1f) == 0x01) {
+ $s .= "INT ";
+ } elsif (($reqtype & 0x1f) == 0x02) {
+ $s .= "EP ";
+ } elsif (($reqtype & 0x1f) == 0x03) {
+ $s .= "OTHER ";
+ } elsif (($reqtype & 0x1f) == 0x04) {
+ $s .= "PORT ";
+ } elsif (($reqtype & 0x1f) == 0x05) {
+ $s .= "RPIPE ";
+ } else {
+ $s .= sprintf "RECIP 0x%02x ", $reqtype & 0x1f;
+ }
+
+ $s =~ s/\s+$//;
+ return $s;
+}
+
+my %i2c;
+my $i2c_id;
+while (<>) {
+ tr/A-F/a-f/;
+ if (m/([0-9a-f].) ([0-9a-f].) ([0-9a-f].) ([0-9a-f].) ([0-9a-f].) ([0-9a-f].) ([0-9a-f].) ([0-9a-f].)[\<\>\s]+(.*)/) {
+ my $reqtype = hex($1);
+ my $req = hex($2);
+ my $wvalue = hex("$4$3");
+ my $windex = hex("$6$5");
+ my $wlen = hex("$8$7");
+ my $payload = $9;
+ my $fullpayload = $9;
+
+ %i2c = i2c_reg($payload) if ($wvalue == 0x10c0);
+
+ if (($wvalue >= 0x10c0) && ($wvalue <= 0x10c2)) {
+ my $reg = $wvalue;
+ if ($reg == 0x10c0) {
+ $payload =~ s/^([0-9a-f].)//;
+ $payload =~ s/^\s+//;
+ $reg++;
+ }
+ if ($reg == 0x10c1 && $payload ne "") {
+ $i2c_id = $payload;
+ $i2c_id =~ s/\s+.*//;
+ $i2c_id = "addr=0x$i2c_id, ";
+ $payload =~ s/^([0-9a-f].)//;
+ $payload =~ s/^\s+//;
+ $reg++;
+ }
+
+# my $data = $payload;
+# $payload =~
+
+ my $s = sprintf "%s %s %s %s %s size=%d",
+ $i2c{"op"}, $i2c{"speed"}, $i2c{"busy"}, $i2c{"err"}, $i2c{"i2c"}, $i2c{"size"};
+ $s =~ s/\s+/ /g;
+
+ if ($reqtype & 0x80) {
+ printf "Read I2C: $s $i2c_id$payload\n";
+ } else {
+ printf "I2C $s $i2c_id$payload\n";
+ }
+ printf("\t%s, Req %3d, wValue: 0x%04x, wIndex 0x%04x, wlen %d: %s\n",
+ type_req($reqtype), $req, $wvalue, $windex, $wlen, $fullpayload);
+ } else {
+ printf("%s, Req %3d, wValue: 0x%04x, wIndex 0x%04x, wlen %d: %s\n",
+ type_req($reqtype), $req, $wvalue, $windex, $wlen, $payload);
+ }
+ }
+}