linux-kernel - Re: RFC: Light sensors, unifying current options?

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Message-ID: <20090911092049.70887ad0@hyperion.delvare>
Date:	Fri, 11 Sep 2009 09:20:49 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	Jonathan Cameron <jic23@....ac.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	"lenb@...nel.org" <lenb@...nel.org>, "pavel@....cz" <pavel@....cz>,
	"Cory T. Tusar" <ctusar@...eon-central.com>,
	"Trisal, Kalhan" <kalhan.trisal@...el.com>,
	linux-acpi <linux-acpi@...r.kernel.org>
Subject: Re: RFC: Light sensors, unifying current options?

On Fri, 11 Sep 2009 09:55:01 +0800, Zhang Rui wrote:
> On Thu, 2009-09-10 at 18:05 +0800, Jonathan Cameron wrote:
> > Some sensors, e.g. tsl2561 use an internal clock to do sampling and hence
> > have some predefined period in which the reading taken doesn't change.
> > Perhaps exporting said period would be useful to userspace?
> > 
> I don't think so.
> IMO, the tsl2561 driver should handle this, and there is no need to
> annoy the user space.
> i.e. users always assume the content of "illuminance" attribute is
> valid, and it's the driver's job to make this true. We don't need to
> document this.

I agree with Rui on this. Let's not delegate everything to user-space,
otherwise it's pointless to write kernel drivers in the first place.

-- 
Jean Delvare
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