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

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Message-ID: <4AAA12EC.1090204@cam.ac.uk>
Date:	Fri, 11 Sep 2009 10:05:48 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	Jean Delvare <khali@...ux-fr.org>
CC:	Zhang Rui <rui.zhang@...el.com>,
	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?

Jean Delvare wrote:
> 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.
Agreed, if anyone has an application they can add the relevant hooks when
they need them.

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