linux-kernel - Re: [RS232] setting trigger-level of fifo

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Message-ID: <20080109170907.4b05d71b@lxorguk.ukuu.org.uk>
Date:	Wed, 9 Jan 2008 17:09:07 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Folkert van Heusden <folkert@...heusden.com>
Cc:	linux-kernel@...r.kernel.org, udovdh@...all.nl
Subject: Re: [RS232] setting trigger-level of fifo

>         serial8250_set_mctrl(&up->port, up->port.mctrl);
>         spin_unlock_irqrestore(&up->port.lock, flags);
> }
> 
> But I don't know how to interface this to an ioctl or so.

tty ioctl calls both ldisc and driver ioctls (in your case the
serial_core ioctl). The triggers get recomputed in the 8250 driver so you
may need to think about how you handle speed changes automatically
adjusting trigger levels.

Alan
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