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#!/usr/bin/env python3
#
# This example shows how to 'filter' device events from a device node.
# While real filtering is not possible, we can duplicate the input device as
# a new virtual input device and replay all events of the input events on
# our virtual one.
import sys
import libevdev
def main(args):
path = args[1]
code_from = libevdev.evbit(args[2])
code_to = libevdev.evbit(args[3])
print('Remapping {} to {}'.format(code_from, code_to))
fd = open(path, 'rb')
d = libevdev.Device(fd)
d.grab()
# create a duplicate of our input device
d.enable(code_to) # make sure the code we map to is available
uidev = d.create_uinput_device()
print('Device is at {}'.format(uidev.devnode))
while True:
for e in d.events():
# change any event with our event code to
# the one we want to map to, but pass all other events
# through
if e.code == code_from:
e = libevdev.InputEvent(code_to, e.value)
uidev.send_events([e])
if __name__ == "__main__":
if len(sys.argv) < 4:
print("Usage: {} /dev/input/eventX <from> <to>".format(sys.argv[0]))
print(" where <from> and <to> are event codes, e.g. REL_X")
sys.exit(1)
main(sys.argv)
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