This has been superseded by a driver included in the kernel, drivers/input/serio/ps2-gpio.c

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PS/2 over GPIO for Linux

A simple kernel module that allows connecting a PS/2 keyboard using GPIO (one input for data and one for clock).

This can be used e.g. to connect and old PS/2 keyboard to a Raspberry PI or a similar SBC and thus save one USB port.

The implementation is a bit quick-and-dirty so you probably shouldn't use it in production.