2 # This validates that the kernel will fall back to using the user helper
3 # to load firmware it can't find on disk itself. We must request a firmware
4 # that the kernel won't find, and any installed helper (e.g. udev) also
5 # won't find so that we can do the load ourself manually.
10 DIR=/sys/devices/virtual/misc/test_firmware
12 # CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
13 # These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
14 # as an indicator for CONFIG_FW_LOADER_USER_HELPER.
15 HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
17 if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
18 OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
20 echo "usermode helper disabled so ignoring test"
25 FW="$FWPATH/test-firmware.bin"
29 echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
39 # This will block until our load (below) has finished.
40 echo -n "$name" >"$DIR"/trigger_request &
42 # Give kernel a chance to react.
44 while [ ! -e "$DIR"/"$name"/loading ]; do
46 timeout=$(( $timeout - 1 ))
47 if [ "$timeout" -eq 0 ]; then
48 echo "$0: firmware interface never appeared" >&2
53 echo 1 >"$DIR"/"$name"/loading
54 cat "$file" >"$DIR"/"$name"/data
55 echo 0 >"$DIR"/"$name"/loading
57 # Wait for request to finish.
61 trap "test_finish" EXIT
63 # This is an unlikely real-world firmware content. :)
64 echo "ABCD0123" >"$FW"
65 NAME=$(basename "$FW")
67 # Test failure when doing nothing (timeout works).
68 echo 1 >/sys/class/firmware/timeout
69 echo -n "$NAME" >"$DIR"/trigger_request
70 if diff -q "$FW" /dev/test_firmware >/dev/null ; then
71 echo "$0: firmware was not expected to match" >&2
74 echo "$0: timeout works"
77 # Put timeout high enough for us to do work but not so long that failures
78 # slow down this test too much.
79 echo 4 >/sys/class/firmware/timeout
81 # Load this script instead of the desired firmware.
83 if diff -q "$FW" /dev/test_firmware >/dev/null ; then
84 echo "$0: firmware was not expected to match" >&2
87 echo "$0: firmware comparison works"
90 # Do a proper load, which should work correctly.
92 if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
93 echo "$0: firmware was not loaded" >&2
96 echo "$0: user helper firmware loading works"