linux-kernel - [PATCH v6 05/13] iio: afe: rescale: add INT_PLUS

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Date:   Tue, 20 Jul 2021 23:06:05 -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 v6 05/13] iio: afe: rescale: add INT_PLUS_{MICRO,NANO} support

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

Some ADCs use IIO_VAL_INT_PLUS_{NANO,MICRO} scale types.
Add support for these to allow using the iio-rescaler with them.

Signed-off-by: Liam Beguin <lvb@...hos.com>
---
 drivers/iio/afe/iio-rescale.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
index d0669fd8eac5..2b73047365cc 100644
--- a/drivers/iio/afe/iio-rescale.c
+++ b/drivers/iio/afe/iio-rescale.c
@@ -41,6 +41,20 @@ int rescale_process_scale(struct rescale *rescale, int scale_type,
 		do_div(tmp, 1000000000LL);
 		*val = tmp;
 		return scale_type;
+	case IIO_VAL_INT_PLUS_NANO:
+		tmp = ((s64)*val * 1000000000LL + *val2) * rescale->numerator;
+		tmp = div_s64(tmp, rescale->denominator);
+
+		*val = div_s64(tmp, 1000000000LL);
+		*val2 = tmp - *val * 1000000000LL;
+		return scale_type;
+	case IIO_VAL_INT_PLUS_MICRO:
+		tmp = ((s64)*val * 1000000LL + *val2) * rescale->numerator;
+		tmp = div_s64(tmp, rescale->denominator);
+
+		*val = div_s64(tmp, 1000000);
+		*val2 = tmp - *val * 1000000;
+		return scale_type;
 	default:
 		return -EOPNOTSUPP;
 	}
-- 
2.30.1.489.g328c10930387