From: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Date: Thu, 16 Oct 2025 05:20:38 +0000 (+0200)
Subject: iio: humditiy: hdc3020: fix units for temperature and humidity measurement
X-Git-Tag: v6.17.11~90
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56b6a28e63f1836414092a4ee0793ce8fde324da;p=thirdparty%2Fkernel%2Fstable.git

iio: humditiy: hdc3020: fix units for temperature and humidity measurement

commit 7b8dc11c0a830caa0d890c603d597161c6c26095 upstream.

According to the ABI the units after application of scale and offset are
milli degrees for temperature measurements and milli percent for relative
humidity measurements. Currently the resulting units are degree celsius for
temperature measurements and percent for relative humidity measurements.
Change scale factor to fix this issue.

Fixes: c9180b8e39be ("iio: humidity: Add driver for ti HDC302x humidity sensors")
Reported-by: Chris Lesiak <chris.lesiak@licorbio.com>
Suggested-by: Chris Lesiak <chris.lesiak@licorbio.com>
Reviewed-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/iio/humidity/hdc3020.c b/drivers/iio/humidity/hdc3020.c
index ffb25596d3a8b..8aa567d9aded9 100644
--- a/drivers/iio/humidity/hdc3020.c
+++ b/drivers/iio/humidity/hdc3020.c
@@ -301,9 +301,9 @@ static int hdc3020_read_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_SCALE:
 		*val2 = 65536;
 		if (chan->type == IIO_TEMP)
-			*val = 175;
+			*val = 175 * MILLI;
 		else
-			*val = 100;
+			*val = 100 * MILLI;
 		return IIO_VAL_FRACTIONAL;
 
 	case IIO_CHAN_INFO_OFFSET: