patch "iio: pressure: mpl115: fix temperature offset sign" added to staging-linus
Subsystems (2)
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.
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From
431386e783a3a6c8b7707bee32d18c353b8688b2Mon Sep 17 00:00:00 2001
From: Akinobu Mita <[email protected]>
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.
--- drivers/iio/pressure/mpl115.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/iio/pressure/mpl115.c +1 -1
@@ -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 :
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2.7.0