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#!/bin/sh
#
SYS_PATH="/sys/class/misc/tpm0/device/"
MODULES="atmel tis nsc infineon"
MODULES_FORCE="tis"
FLAGS=""
FLAGS_FORCE="force=1"
test_tpm() {
if [ ! -d "$SYS_PATH" ] ; then
return 1
fi
# tpm_tis creates "active" and "enabled" files
# _atmel and _nsc only create the "caps"
ACTIVE="$(cat $SYS_PATH/active 2>/dev/null)"
ENABLED="$(cat $SYS_PATH/enabled 2>/dev/null)"
CAPS="$(cat $SYS_PATH/caps 2>/dev/null)"
if [ -n "$ACTIVE" -o -n "$ENABLED" -o -n "$CAPS" ] ; then
echo
echo "successfully detected TPM chip!"
echo
echo "$CAPS"
echo
else
return 2
fi
}
try_modules() {
if [ "$1" == "force" ] ; then
MODULES=$MODULES_FORCE
FLAGS=$FLAGS_FORCE
echo "using flags '$FLAGS'"
fi
echo -n "trying modules:"
for module in $MODULES ; do
echo -n " $module"
modprobe tpm_${module} $FLAGS 2>/dev/null
if test_tpm ; then
return 0
fi
# clean up since e.g. infineon always loads w/o error...
modprobe -r tpm_${module} 2>/dev/null
done
echo
return 1
}
# create device-node
test -c /dev/tpm0 || mknod /dev/tpm0 c 10 224
if try_modules ; then
exit 0 # success
fi
if ! try_modules force ; then
echo "Warning: no TPM chip found!"
exit 1
fi
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