linux-kernel - Re: Linux tty driver question

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Message-ID: <45D6E094.8030006@gmail.com>
Date:	Sat, 17 Feb 2007 12:01:40 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Mockern@...dex.ru
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Linux tty driver question

Mockern napsal(a):
> Hi,
> 
> I'm working on Linux tty driver (based on tiny_tty).
> 
> How can I provide in my driver Linux cat operation (e.g.cat < ttyS3)?

call tty_insert_flip_*() from somewhere to put some data into tty recieve 
buffer, which is pushed into ldisc by tty_flip_buffer_push() and then sent by 
tty_read function (where ldisc read is called) to userspace for reading process.

> What should I implement exactly?

open, settermios, write_room (note that this is minimal and will probably oops 
when poll or write is invoked) + some isr or timer to fill the buffer mentioned 
above.

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E

Hnus <hnus@...muni.cz> is an alias for /dev/null
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