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

[Kim, Milo]

> > +	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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/