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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2018-02-10 from rev 9e6ad6607a9e.

LPT

USB to LPT chip

** PL-2305.

The PL-2305 USB-to-IEEE-1284 Bridge Controller is a low-cost high-performance single chip solution that provides bi-directional connectivity between any standard IEEE-1284 compliant parallel port devices and the Universal Serial Bus (USB) interface.

$ lsusb
... ID 067b:2305 Prolific Technology, Inc. PL2305 Parallel Port

See:

http://www.prolific.com.tw/eng/products.asp?id=6
About page.
http://www.prolific.com.tw/eng/downloads.asp?ID=36
Driver download page.

USB to LPT driver

See 'linux-src/drivers/usb/class/usblp.c'.