From: Lars-Peter Clausen <lars@metafoo.de>
Date: Fri, 14 Jun 2013 15:58:00 +0000 (+0100)
Subject: staging:iio:ad7291: Use IIO_VAL_FRACTIONAL_LOG2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=73a4445f302f6bf54940d36659bb008d018cef98;p=linux-beck.git

staging:iio:ad7291: Use IIO_VAL_FRACTIONAL_LOG2

This is a bit more straight forward and also allows better precession when using
the an in-kernel consumer.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c
index d088c662d5cd..a3a3a2f27584 100644
--- a/drivers/staging/iio/adc/ad7291.c
+++ b/drivers/staging/iio/adc/ad7291.c
@@ -456,7 +456,6 @@ static int ad7291_read_raw(struct iio_dev *indio_dev,
 {
 	int ret;
 	struct ad7291_chip_info *chip = iio_priv(indio_dev);
-	unsigned int scale_uv;
 	u16 regval;
 	s16 signval;
 
@@ -513,10 +512,9 @@ static int ad7291_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->type) {
 		case IIO_VOLTAGE:
-			scale_uv = (chip->int_vref_mv * 1000) >> AD7291_BITS;
-			*val =  scale_uv / 1000;
-			*val2 = (scale_uv % 1000) * 1000;
-			return IIO_VAL_INT_PLUS_MICRO;
+			*val = chip->int_vref_mv;
+			*val2 = AD7291_BITS;
+			return IIO_VAL_FRACTIONAL_LOG2;
 		case IIO_TEMP:
 			/*
 			 * One LSB of the ADC corresponds to 0.25 deg C.