From: Alexandre Belloni <[email protected]> This patch has been added to the 3.18 stable tree. If you have any objections, please let us know.
=============== [ Upstream commit b94e22805a2224061bb263a82b72e09544a5fbb3 ] 0° Kelvin is actually −273.15°C, not -272.15°C. Fix the temperature offset. Also improve the comment explaining the calculation. Reported-by: Janusz Użycki <[email protected]> Signed-off-by: Alexandre Belloni <[email protected]> Acked-by: Stefan Wahren <[email protected]> Acked-by: Marek Vasut <[email protected]> Cc: <[email protected]> Signed-off-by: Jonathan Cameron <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- drivers/staging/iio/adc/mxs-lradc.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c index ffd4207..6050c58 100644 --- a/drivers/staging/iio/adc/mxs-lradc.c +++ b/drivers/staging/iio/adc/mxs-lradc.c @@ -910,11 +910,12 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev, case IIO_CHAN_INFO_OFFSET: if (chan->type == IIO_TEMP) { /* The calculated value from the ADC is in Kelvin, we - * want Celsius for hwmon so the offset is - * -272.15 * scale + * want Celsius for hwmon so the offset is -273.15 + * The offset is applied before scaling so it is + * actually -213.15 * 4 / 1.012 = -1079.644268 */ - *val = -1075; - *val2 = 691699; + *val = -1079; + *val2 = 644268; return IIO_VAL_INT_PLUS_MICRO; } -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
