From: <gregkh@linuxfoundation.org>
To: alexandre.belloni@free-electrons.com, gregkh@linuxfoundation.org,
j.uzycki@elpromaelectronics.com, jic23@kernel.org, marex@denx.de,
stable@vger.kernel.org, stefan.wahren@i2se.com
Cc: <stable@vger.kernel.org>, <stable-commits@vger.kernel.org>
Subject: Patch "iio: mxs-lradc: Fix temperature offset" has been added to the 4.2-stable tree
Date: Thu, 05 Nov 2015 21:54:16 -0800 [thread overview]
Message-ID: <1446789256184154@kroah.com> (raw)
This is a note to let you know that I've just added the patch titled
iio: mxs-lradc: Fix temperature offset
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-mxs-lradc-fix-temperature-offset.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From b94e22805a2224061bb263a82b72e09544a5fbb3 Mon Sep 17 00:00:00 2001
From: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Date: Wed, 7 Oct 2015 13:10:54 +0200
Subject: iio: mxs-lradc: Fix temperature offset
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From: Alexandre Belloni <alexandre.belloni@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.uzycki@elpromaelectronics.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Marek Vasut <marex@denx.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/iio/adc/mxs-lradc.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -919,11 +919,12 @@ static int mxs_lradc_read_raw(struct iio
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;
}
Patches currently in stable-queue which might be from alexandre.belloni@free-electrons.com are
queue-4.2/iio-mxs-lradc-fix-temperature-offset.patch
reply other threads:[~2015-11-06 5:54 UTC|newest]
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