linux-kernel - [PATCH v1 3/9] iio: afe: rescale: use core to get processed value

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Date:   Sat, 29 May 2021 20:59:11 -0400
From:   Liam Beguin <liambeguin@...il.com>
To:     liambeguin@...il.com, peda@...ntia.se, jic23@...nel.org,
        lars@...afoo.de, pmeerw@...erw.net
Cc:     linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org
Subject: [PATCH v1 3/9] iio: afe: rescale: use core to get processed value

From: Liam Beguin <lvb@...hos.com>

Make use of the IIO core to compute the source channel's processed
value. This reduces duplication and will facilitate the addition of
offsets in the iio-rescale driver.

Signed-off-by: Liam Beguin <lvb@...hos.com>
---
 drivers/iio/afe/iio-rescale.c | 37 ++++++++++-------------------------
 1 file changed, 10 insertions(+), 27 deletions(-)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index e42ea2b1707d..4d0813b274d1 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -38,36 +38,20 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
 			    int *val, int *val2, long mask)
 {
 	struct rescale *rescale = iio_priv(indio_dev);
-	unsigned long long tmp;
 	int ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		return iio_read_channel_raw(rescale->source, val);
+		ret = iio_read_channel_processed(rescale->source, val);
 
+		return IIO_VAL_INT;
 	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;
-		}
+		*val = rescale->numerator;
+		if (rescale->denominator == 1)
+			return IIO_VAL_INT;
+		*val2 = rescale->denominator;
+
+		return IIO_VAL_FRACTIONAL;
 	default:
 		return -EINVAL;
 	}
@@ -130,9 +114,8 @@ static int rescale_configure_channel(struct device *dev,
 	chan->ext_info = rescale->ext_info;
 	chan->type = rescale->cfg->type;
 
-	if (!iio_channel_has_info(schan, IIO_CHAN_INFO_RAW) ||
-	    !iio_channel_has_info(schan, IIO_CHAN_INFO_SCALE)) {
-		dev_err(dev, "source channel does not support raw/scale\n");
+	if (!iio_channel_has_info(schan, IIO_CHAN_INFO_RAW)) {
+		dev_err(dev, "source channel does not support raw\n");
 		return -EINVAL;
 	}
 
-- 
2.30.1.489.g328c10930387