iio: pressure: bmp280: fix relative humidity unit

[ Upstream commit 13399ff25f179811ce9c1df1523eb39f9e4a4772 ]

According to IIO ABI relative humidity reading should be
returned in milli percent.

This patch addresses that by applying proper scaling and
returning integer instead of fractional format type specifier.

Note that the fixes tag is before the driver was heavily refactored
to introduce spi support, so the patch won't apply that far back.

Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
Fixes: 14beaa8f5ab1 ("iio: pressure: bmp280: add humidity support")
Acked-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 8f26428804a236fa1a38e612c0cd6aa3245b7eff..5f625ffa2a88d8b12d10491d85e920e519c8a97c 100644 (file)
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -362,10 +362,9 @@ static int bmp280_read_humid(struct bmp280_data *data, int *val, int *val2)
        }
        comp_humidity = bmp280_compensate_humidity(data, adc_humidity);
 
-       *val = comp_humidity;
-       *val2 = 1024;
+       *val = comp_humidity * 1000 / 1024;
 
-       return IIO_VAL_FRACTIONAL;
+       return IIO_VAL_INT;
 }
 
 static int bmp280_read_raw(struct iio_dev *indio_dev,