linux-kernel - Re: tiny tty driver sample

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Message-ID: <Pine.LNX.4.64.0703071730190.10909@twin.jikos.cz>
Date:	Wed, 7 Mar 2007 17:32:29 +0100 (CET)
From:	Jiri Kosina <jikos@...os.cz>
To:	Jon Ringle <JRingle@...tical.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: tiny tty driver sample

On Wed, 7 Mar 2007, Jon Ringle wrote:

> I'm trying to write a tty driver and I'm using 
> http://lwn.net/images/pdf/LDD3/ch18.pdf as a guide. The sample tiny tty 
> driver includes the following code:
>             for (i = 0; i < data_size; ++i) {
>                         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
>                                     tty_flip_buffer_push(tty);
>                         tty_insert_flip_char(tty, data[i], TTY_NORMAL);
>             }
>             tty_flip_buffer_push(tty);
> This doesn't compile against Linux 2.6.16 kernel I'm using, because 
> tty->flip.count doesn't exist anymore. How should this sample be 
> re-coded?

I guess something like

	tty_buffer_request_room(tty, data_size);
	for (i = 0; i < data_size; ++i)
		work += tty_insert_flip_char(tty, data[i], TTY_NORMAL);
	if (work)
		tty_flip_buffer_push(tty);

will do.

-- 
Jiri Kosina
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