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#!/usr/bin/env python3
#
# This example shows how to update a kernel device's axis range
# This can be useful to e.g. change the resolution on a touchpad.
# Note that this is an example only, there are a lot of race conditions to
# be considered when using this as a proper solution.
import sys
import libevdev
def main(args):
path = args[1]
axis = args[2]
field = args[3]
value = int(args[4])
assert field in ['minimum', 'maximum', 'resolution']
axis = libevdev.evbit(axis)
assert axis is not None
fd = open(path, 'rb')
d = libevdev.Device(fd)
if not d.has(axis):
print('Device does not have axis {}'.format(axis))
sys.exit(1)
a = d.absinfo[axis]
setattr(a, field, value)
d.absinfo[axis] = a
d.sync_absinfo_to_kernel(axis)
if __name__ == "__main__":
if len(sys.argv) < 5:
print("Usage: {} /dev/input/eventX <axis> <field> <value>".format(sys.argv[0]))
print(" <axis> ... an EV_ABS event code, e.g. ABS_X")
print(" <field> .. one of 'minimum', 'maximum', 'resolution'")
print(" <value> .. the numeric value to set the axis field to")
sys.exit(1)
main(sys.argv)
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