From mboxrd@z Thu Jan  1 00:00:00 1970
From: LW@KARO-electronics.de (=?iso-8859-15?Q?Lothar_Wa=DFmann?=)
Date: Wed, 27 Jan 2010 15:52:34 +0100
Subject: [PATCH v3] input: MXC: add mxc-keypad driver to support the
	Keypad Port present in the mxc application processors family.
In-Reply-To: <1264603193.2463.75.camel@realization>
References: <1264586106.2463.23.camel@realization>
	<19296.5728.557535.920849@ipc1.ka-ro>
	<1264594452.2463.62.camel@realization>
	<19296.12024.559688.606548@ipc1.ka-ro>
	<1264603193.2463.75.camel@realization>
Message-ID: <19296.21298.394254.553268@ipc1.ka-ro>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi,

Alberto Panizzo writes:
> On mer, 2010-01-27 at 13:18 +0100, Lothar Wa?mann wrote:
> > Hi,
> > 
> > Alberto Panizzo writes:
> > > > > +	irq = platform_get_irq(pdev, 0);
> > > > > +	if (irq < 0) {
> > > > > +		dev_err(&pdev->dev, "failed to get keypad irq\n");
> > > > > +		return -ENXIO;
> > > > > +	}
> > > > >
> > > > This should be -ENODEV.
> > > > 
> > > Lot of reference keyboard driver use -ENXIO..
> > > May should be better: return irq ?
> > > 
> > Yes, of course. If a function returns an error code that should be
> > promoted to the caller instead of inventing a new error code.
> > 
> > 
> > Lothar Wa?mann
> 
> But, errno.h say:
> #define ENXIO           6                // Device not configured
> #define ENODEV          19               // Operation not supported by device
> 
What errno.h file is that?
I have:
./include/asm-generic/errno-base.h:#define      ENXIO            6      /* No such device or address */
./include/asm-generic/errno-base.h:#define      ENODEV          19      /* No such device */

AFAIK ENXIO is used when actual I/O has been attempted. But in this
case the driver is still being configured and did not do any I/O yet.


Lothar Wa?mann
-- 
___________________________________________________________

Ka-Ro electronics GmbH | Pascalstra?e 22 | D - 52076 Aachen
Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10
Gesch?ftsf?hrer: Matthias Kaussen
Handelsregistereintrag: Amtsgericht Aachen, HRB 4996

www.karo-electronics.de | info at karo-electronics.de
___________________________________________________________