ioctl to enable/disable an RS485 termination resistor

[Shaun Jackman]

I have a custom RS485 serial device that allows the termination
resistor to be enabled/disabled using a relay. When writing the driver
for this device, how should I choose the ioctl name/number to set the
RS485 termination parameter?

Please cc me in your reply. Many thanks,
Shaun
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