linux-kernel - Re: [RFC v2 4/4] iio: chemical: add SGX VZ89x VOC sensor support

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Date:	Mon, 07 Sep 2015 10:08:42 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Matt Ranostay <mranostay@...il.com>,
	Jonathan Cameron <jic23@...nel.org>
CC:	Peter Meerwald <pmeerw@...erw.net>,
	"open list:IIO SUBSYSTEM AND..." <linux-iio@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	George McCollister <george.mccollister@...il.com>
Subject: Re: [RFC v2 4/4] iio: chemical: add SGX VZ89x VOC sensor support

On 09/07/2015 06:27 AM, Matt Ranostay wrote:
> Thinking this over do we needed a IIO_CHAN_INFO_PROCESSED_OFFSET to
> signal that it needs to be after the (value - offset) * scale
> calculation?

Well, value * scale + offset = (value + offset/scale) * scale. So just scale
your offset inversely to the scale.

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