on orangepi it works as below
orangepi@orangepi:/dev/input$ sudo cat event1
�{Vt��V��/
t��/
�1t�1^
orangepi@orangepi:/sys/devices/virtual/input/input1$ cat uevent
PRODUCT=19/1/1/100
NAME=”sunxi-gpiokey”
PHYS=”sunxikbd/input0″
PROP=0
EV=3
KEY=100000 0 0 0
MODALIAS=input:b0019v0001p0001e0100-e0,1,k74,ramlsfw
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