From: <gregkh@linuxfoundation.org>
To: akinobu.mita@gmail.com, Stable@vger.kernel.org, jic23@kernel.org,
pmeerw@pmeerw.net
Subject: patch "iio: pressure: mpl115: fix temperature offset sign" added to staging-linus
Date: Mon, 01 Feb 2016 13:08:09 -0800 [thread overview]
Message-ID: <1454360889243230@kroah.com> (raw)
This is a note to let you know that I've just added the patch titled
iio: pressure: mpl115: fix temperature offset sign
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 431386e783a3a6c8b7707bee32d18c353b8688b2 Mon Sep 17 00:00:00 2001
From: Akinobu Mita <akinobu.mita@gmail.com>
Date: Thu, 21 Jan 2016 01:07:31 +0900
Subject: iio: pressure: mpl115: fix temperature offset sign
According to the datasheet, the resolusion of temperature sensor is
-5.35 counts/C. Temperature ADC is 472 counts at 25C.
(https://www.sparkfun.com/datasheets/Sensors/Pressure/MPL115A1.pdf
NOTE: This is older revision, but this information is removed from the
latest datasheet from nxp somehow)
Temp [C] = (Tadc - 472) / -5.35 + 25
= (Tadc - 605.750000) * -0.186915888
So the correct offset is -605.750000.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---
drivers/iio/pressure/mpl115.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/pressure/mpl115.c b/drivers/iio/pressure/mpl115.c
index f5ecd6e19f5d..a0d7deeac62f 100644
--- a/drivers/iio/pressure/mpl115.c
+++ b/drivers/iio/pressure/mpl115.c
@@ -117,7 +117,7 @@ static int mpl115_read_raw(struct iio_dev *indio_dev,
*val = ret >> 6;
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
- *val = 605;
+ *val = -605;
*val2 = 750000;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SCALE:
--
2.7.0
reply other threads:[~2016-02-01 21:08 UTC|newest]
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