3.19.8-ckt10 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Alexandre Belloni <alexandre.bell...@free-electrons.com>
commit b94e22805a2224061bb263a82b72e09544a5fbb3 upstream.
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 <j.uzy...@elpromaelectronics.com>
Signed-off-by: Alexandre Belloni <alexandre.bell...@free-electrons.com>
Acked-by: Stefan Wahren <stefan.wah...@i2se.com>
Acked-by: Marek Vasut <ma...@denx.de>
Signed-off-by: Jonathan Cameron <ji...@kernel.org>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
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 351339c..3b9859b 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -912,11 +912,12 @@ 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;
}
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
