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Message-Id: <1444216254-19668-1-git-send-email-alexandre.belloni@free-electrons.com> Date: Wed, 7 Oct 2015 13:10:54 +0200 From: Alexandre Belloni <alexandre.belloni@...e-electrons.com> To: Jonathan Cameron <jic23@...nel.org> Cc: Lars-Peter Clausen <lars@...afoo.de>, Stefan Wahren <stefan.wahren@...e.com>, Janusz Użycki <j.uzycki@...romaelectronics.com>, Marek Vasut <marex@...x.de>, linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, Alexandre Belloni <alexandre.belloni@...e-electrons.com> Subject: [PATCH v2] iio: mxs-lradc: Fix temperature offset 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.uzycki@...romaelectronics.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.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 3f7715c9968b..47fc00a3f63b 100644 --- a/drivers/staging/iio/adc/mxs-lradc.c +++ b/drivers/staging/iio/adc/mxs-lradc.c @@ -915,11 +915,12 @@ 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; } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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