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#!/bin/sh
# This validates that the kernel will load firmware out of its list of
# firmware locations on disk. Since the user helper does similar work,
# we reset the custom load directory to a location the user helper doesn't
# know so we can be sure we're not accidentally testing the user helper.
set -e
modprobe test_firmware
DIR=/sys/devices/virtual/misc/test_firmware
# CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
# These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
# as an indicator for CONFIG_FW_LOADER_USER_HELPER.
HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
fi
OLD_FWPATH=$(cat /sys/module/firmware_class/parameters/path)
FWPATH=$(mktemp -d)
FW="$FWPATH/test-firmware.bin"
test_finish()
{
if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
fi
if [ "$OLD_FWPATH" = "" ]; then
# A zero-length write won't work; write a null byte
printf '\000' >/sys/module/firmware_class/parameters/path
else
echo -n "$OLD_FWPATH" >/sys/module/firmware_class/parameters/path
fi
rm -f "$FW"
rmdir "$FWPATH"
}
trap "test_finish" EXIT
if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
# Turn down the timeout so failures don't take so long.
echo 1 >/sys/class/firmware/timeout
fi
# Set the kernel search path.
echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
# This is an unlikely real-world firmware content. :)
echo "ABCD0123" >"$FW"
NAME=$(basename "$FW")
if printf '\000' >"$DIR"/trigger_request 2> /dev/null; then
echo "$0: empty filename should not succeed" >&2
exit 1
fi
# Request a firmware that doesn't exist, it should fail.
if echo -n "nope-$NAME" >"$DIR"/trigger_request 2> /dev/null; then
echo "$0: firmware shouldn't have loaded" >&2
exit 1
fi
if diff -q "$FW" /dev/test_firmware >/dev/null ; then
echo "$0: firmware was not expected to match" >&2
exit 1
else
if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
echo "$0: timeout works"
fi
fi
# This should succeed via kernel load or will fail after 1 second after
# being handed over to the user helper, which won't find the fw either.
if ! echo -n "$NAME" >"$DIR"/trigger_request ; then
echo "$0: could not trigger request" >&2
exit 1
fi
# Verify the contents are what we expect.
if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
echo "$0: firmware was not loaded" >&2
exit 1
else
echo "$0: filesystem loading works"
fi
exit 0