tools/testing/selftests/firmware/fw_filesystem.sh

   1 #!/bin/sh
   2 # This validates that the kernel will load firmware out of its list of
   3 # firmware locations on disk. Since the user helper does similar work,
   4 # we reset the custom load directory to a location the user helper doesn't
   5 # know so we can be sure we're not accidentally testing the user helper.
   6 set -e
   7
   8 modprobe test_firmware
   9
  10 DIR=/sys/devices/virtual/misc/test_firmware
  11
  12 OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
  13 OLD_FWPATH=$(cat /sys/module/firmware_class/parameters/path)
  14
  15 FWPATH=$(mktemp -d)
  16 FW="$FWPATH/test-firmware.bin"
  17
  18 test_finish()
  19 {
  20         echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
  21         echo -n "$OLD_PATH" >/sys/module/firmware_class/parameters/path
  22         rm -f "$FW"
  23         rmdir "$FWPATH"
  24 }
  25
  26 trap "test_finish" EXIT
  27
  28 # Turn down the timeout so failures don't take so long.
  29 echo 1 >/sys/class/firmware/timeout
  30 # Set the kernel search path.
  31 echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
  32
  33 # This is an unlikely real-world firmware content. :)
  34 echo "ABCD0123" >"$FW"
  35
  36 NAME=$(basename "$FW")
  37
  38 # Request a firmware that doesn't exist, it should fail.
  39 echo -n "nope-$NAME" >"$DIR"/trigger_request
  40 if diff -q "$FW" /dev/test_firmware >/dev/null ; then
  41         echo "$0: firmware was not expected to match" >&2
  42         exit 1
  43 else
  44         echo "$0: timeout works"
  45 fi
  46
  47 # This should succeed via kernel load or will fail after 1 second after
  48 # being handed over to the user helper, which won't find the fw either.
  49 if ! echo -n "$NAME" >"$DIR"/trigger_request ; then
  50         echo "$0: could not trigger request" >&2
  51         exit 1
  52 fi
  53
  54 # Verify the contents are what we expect.
  55 if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
  56         echo "$0: firmware was not loaded" >&2
  57         exit 1
  58 else
  59         echo "$0: filesystem loading works"
  60 fi
  61
  62 exit 0