linux-kernel - Re: [PATCH v2] Re: Battery class driver.

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Message-ID: <41840b750611010836qe9d49a0q6c5179babd6bc137@mail.gmail.com>
Date:	Wed, 1 Nov 2006 18:36:37 +0200
From:	"Shem Multinymous" <multinymous@...il.com>
To:	"Henrique de Moraes Holschuh" <hmh@....eng.br>
Cc:	"David Woodhouse" <dwmw2@...radead.org>,
	"Richard Hughes" <hughsient@...il.com>,
	"Xavier Bestel" <xavier.bestel@...e.fr>,
	"Jean Delvare" <khali@...ux-fr.org>, davidz@...hat.com,
	"Dan Williams" <dcbw@...hat.com>, linux-kernel@...r.kernel.org,
	devel@...top.org, sfr@...b.auug.org.au, len.brown@...el.com,
	greg@...ah.com, benh@...nel.crashing.org,
	"linux-thinkpad mailing list" <linux-thinkpad@...ux-thinkpad.org>,
	"Pavel Machek" <pavel@...e.cz>
Subject: Re: [PATCH v2] Re: Battery class driver.

On 11/1/06, Henrique de Moraes Holschuh <hmh@....eng.br> wrote:
> On Wed, 01 Nov 2006, David Woodhouse wrote:
> > On Wed, 2006-11-01 at 13:26 +0000, Richard Hughes wrote:
> > > With the battery class driver, how would that be conveyed? Would the
> > > sysfs file be deleted in this case, or would the value of the sysfs
> > > key be something like "<invalid>".
> >
> > I'd be inclined to make the read return -EINVAL.
>
> -EIO for transient errors (e.g. access to the embedded controller/battery
> charger/whatever fails at that instant), -EINVAL for "not supported"
> (missing ACPI method, attribute not supported in the specific hardware)?

Shouldn't it be -EIO or -EBUSY for transient errors (depending on
type), and -ENXIO when not provided by hardware?
The -EINVAL is more appropriate for bad user-supplied values (out of
range etc.) to writable attributes.

  Shem
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