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#$/bin/sh
#open the input event device for our gpio-keys
exec 7<>/dev/input/by-path/platform-soc:base-fpga-region:keys-event
# start a subshell with the output from the device file as its input
(
# loop forever
while [ true ]
do
# get the next 16 byte event data, then extract the three hex strings
# for type, code and value in little endian form and convert each value
# to a decimal representation
SAMPLE="$(dd bs=16 count=1 2> /dev/null | hexdump -v -e '16/1 "%02x "' -e '"\n"' | sed -e "s/.*\s.*\s.*\s.*\s.*\s.*\s.*\s.*\s\(.*\)\s\(.*\)\s\(.*\)\s\(.*\)\s\(.*\)\s\(.*\)\s\(.*\)\s\(.*\)/0x\2\1 0x\4\3 0x\8\7\6\5/")"
SAMPLE_TYPE="$(printf "%d" "$(echo ${SAMPLE} | cut -d ' ' -f 1)")"
SAMPLE_CODE="$(printf "%d" "$(echo ${SAMPLE} | cut -d ' ' -f 2)")"
SAMPLE_VALUE="$(printf "%d" "$(echo ${SAMPLE} | cut -d ' ' -f 3)")"
# if the sample type is EV_KEY, then process it, otherwise ignore it
[ "${SAMPLE_TYPE}" -eq "1" ] && {
# look for the codes that we expect
case "${SAMPLE_CODE}" in
64)
echo -n "SW0"
;;
65)
echo -n "SW1"
;;
66)
echo -n "SW2"
;;
67)
echo -n "SW3"
;;
*)
echo -n "unknown"
;;
esac
# output the value of the event
echo " moved to value '${SAMPLE_VALUE}'"
}
done
) <&7
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