linux-kernel - [PATCH v4 05/10] iio: afe: rescale: add INT_PLUS

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Message-Id: <20210706160942.3181474-6-liambeguin@gmail.com>
Date:   Tue,  6 Jul 2021 12:09:37 -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 v4 05/10] iio: afe: rescale: add INT_PLUS_{MICRO,NANO} support

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

Add IIO_VAL_INT_PLUS_{NANO,MICRO} scaling support.
Scale the integer part and the decimal parts individually and keep the
original scaling type.

Signed-off-by: Liam Beguin <lvb@...hos.com>
---
 drivers/iio/afe/iio-rescale.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index ba3bdcc69b16..1d0e24145d87 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -89,7 +89,15 @@ static int rescale_read_raw(struct iio_dev *indio_dev,
 			do_div(tmp, 1000000000LL);
 			*val = tmp;
 			return ret;
+		case IIO_VAL_INT_PLUS_NANO:
+		case IIO_VAL_INT_PLUS_MICRO:
+			tmp = (s64)*val * rescale->numerator;
+			*val = div_s64(tmp, rescale->denominator);
+			tmp = (s64)*val2 * rescale->numerator;
+			*val2 = div_s64(tmp, rescale->denominator);
+			return ret;
 		default:
+			dev_err(&indio_dev->dev, "unsupported type %d\n", ret);
 			return -EOPNOTSUPP;
 		}
 	default:
-- 
2.30.1.489.g328c10930387