cat, cp operations for tty driver (like for char one)

I have a question about linux tty driver 

how to support cp, cat operations in tty driver (like tiny_tty)?
(e.g. echo "hello tty" > /dev/ttyS3, cat < ttyS10 etc)

There a lot of examples with char drivers, but I could not find it for tty
Linux driver. 


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