linux-kernel - Writing a console/tty driver -- how to use tty

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Message-ID: <4CC893CD.7020701@freescale.com>
Date:	Wed, 27 Oct 2010 16:04:13 -0500
From:	Timur Tabi <timur@...escale.com>
To:	gregkh <gregkh@...e.de>, lkml <linux-kernel@...r.kernel.org>
Subject: Writing a console/tty driver -- how to use tty_port?

Greg,

Do you have an updated version of Tiny TTY that uses tty_port structures?  I'm
trying to write a new TTY driver for a device that is not a UART, and I'm having
a hard time finding a good example.  I suspect I need to understand the tty_port
structure, but I can't find any documentation for it.

One specific problem I'm having is that I can't figure out how to get a
tty_struct pointer in my interrupt handler.  The ISR gets called whenever there
is new input, and it needs to call tty_insert_flip_string().  But it appears
that it's possible to have my driver opened multiple times, each time creating a
new TTY.  But since I can only have one interrupt handler, I don't know how to
determine which of the tty_structs to use.  I figure tty_port is a way to
resolve this problem, but I don't know how to use it exactly.

-- 
Timur Tabi
Linux kernel developer at Freescale

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