linux-kernel - [PATCH v1 1/3] iio: afe: rescale: Move scale conversion to new function

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Date:   Tue, 11 Jun 2019 11:56:57 +0200
From:   Mylène Josserand <mylene.josserand@...tlin.com>
To:     peda@...ntia.se, jic23@...nel.org, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, robh+dt@...nel.org,
        mark.rutland@....com
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, thomas.petazzoni@...tlin.com,
        mylene.josserand@...tlin.com
Subject: [PATCH v1 1/3] iio: afe: rescale: Move scale conversion to new function

To prepare the support of processed value, create a function
to convert the scale according to the voltage-divider node
used in the device-tree.

Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
---
 drivers/iio/afe/iio-rescale.c | 54 +++++++++++++++++++++++++------------------
 1 file changed, 31 insertions(+), 23 deletions(-)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index e9ceee66d1e7..3e689d6eb501 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -33,12 +33,41 @@ struct rescale {
 	s32 denominator;
 };
 
+static int rescale_convert_scale(struct rescale *rescale, int *val, int *val2)
+{
+	unsigned long long tmp;
+	int ret;
+
+	ret = iio_read_channel_scale(rescale->source, val, val2);
+	switch (ret) {
+	case IIO_VAL_FRACTIONAL:
+		*val *= rescale->numerator;
+		*val2 *= rescale->denominator;
+		return ret;
+	case IIO_VAL_INT:
+		*val *= rescale->numerator;
+		if (rescale->denominator == 1)
+			return ret;
+		*val2 = rescale->denominator;
+		return IIO_VAL_FRACTIONAL;
+	case IIO_VAL_FRACTIONAL_LOG2:
+		tmp = *val * 1000000000LL;
+		do_div(tmp, rescale->denominator);
+		tmp *= rescale->numerator;
+		do_div(tmp, 1000000000LL);
+		*val = tmp;
+
+		return ret;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 static int rescale_read_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int *val, int *val2, long mask)
 {
 	struct rescale *rescale = iio_priv(indio_dev);
-	unsigned long long tmp;
 	int ret;
 
 	switch (mask) {
@@ -46,28 +75,7 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
 		return iio_read_channel_raw(rescale->source, val);
 
 	case IIO_CHAN_INFO_SCALE:
-		ret = iio_read_channel_scale(rescale->source, val, val2);
-		switch (ret) {
-		case IIO_VAL_FRACTIONAL:
-			*val *= rescale->numerator;
-			*val2 *= rescale->denominator;
-			return ret;
-		case IIO_VAL_INT:
-			*val *= rescale->numerator;
-			if (rescale->denominator == 1)
-				return ret;
-			*val2 = rescale->denominator;
-			return IIO_VAL_FRACTIONAL;
-		case IIO_VAL_FRACTIONAL_LOG2:
-			tmp = *val * 1000000000LL;
-			do_div(tmp, rescale->denominator);
-			tmp *= rescale->numerator;
-			do_div(tmp, 1000000000LL);
-			*val = tmp;
-			return ret;
-		default:
-			return -EOPNOTSUPP;
-		}
+		return rescale_convert_scale(rescale, val, val2);
 	default:
 		return -EINVAL;
 	}
-- 
2.11.0