linux-kernel - RE: [PATCH v2] iio: adc: add new lp8788 adc driver

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Date:	Thu, 16 Aug 2012 00:42:26 +0000
From:	"Kim, Milo" <Milo.Kim@...com>
To:	Lars-Peter Clausen <lars@...afoo.de>,
	"jic23@....ac.uk" <jic23@....ac.uk>
CC:	"jic23@...nel.org" <jic23@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>
Subject: RE: [PATCH v2] iio: adc: add new lp8788 adc driver

> > +	switch (mask) {
> > +	case IIO_CHAN_INFO_RAW:
> > +		*val = result;
> > +		return IIO_VAL_INT;
> > +	case IIO_CHAN_INFO_SCALE:
> > +		*val = adc_const[id] * ((result * 1000 + 500) / 1000);
> 
> This looks wrong. The IIO_CHAN_INFO_SCALE attribute is the factor by
> which
> IIO_CHAN_INFO_RAW needs to be multiplied to get the value in the proper
> unit,
> which is specified in the IIO ABI spec. E.g. milli volts for voltages.
> 
> What you return here seems to be the IIO_CHAN_INFO_PROCESSED attribute.
> Which
> basically is raw * scale.

Thanks a lot for your review.

Any way to get the result with offset value in the iio-consumer side?
What I need is as below.

  result = raw * scale + offset

At this moment, there are two apis() for reading the iio channel
- iio_read_channel_raw() and iio_read_channel_scale().

Does it sound good if I add iio_read_channel_offset() consumer api
using IIO_CHAN_INFO_OFFSET?

Best Regards,
Milo

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