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iio: pressure: bmp280: Fix BMP580 temperature reading

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[ Upstream commit 0f0f6306617cb4b6231fc9d4ec68ab9a56dba7c0 ]

Fix overflow issue when storing BMP580 temperature reading and
properly preserve sign of 24-bit data.

Signed-off-by: Adam Rizkalla <ajarizzo@gmail.com>
Tested-By: Vasileios Amoiridis <vassilisamir@gmail.com>
Acked-by: Angel Iglesias <ang.iglesiasg@gmail.com>
Link: https://lore.kernel.org/r/Zin2udkXRD0+GrML@adam-asahi.lan
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Adam Rizkalla 2024-04-25 01:22:49 -05:00 committed by Greg Kroah-Hartman
parent 3f199b4e39
commit dd7c4e3704
1 changed files with 5 additions and 5 deletions
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10
drivers/iio/pressure/bmp280-core.c
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@ -1385,12 +1385,12 @@ static int bmp580_read_temp(struct bmp280_data *data, int *val, int *val2)
/*
* Temperature is returned in Celsius degrees in fractional
* form down 2^16. We rescale by x1000 to return milli Celsius
* to respect IIO ABI.
* form down 2^16. We rescale by x1000 to return millidegrees
* Celsius to respect IIO ABI.
*/
*val = raw_temp * 1000;
*val2 = 16;
return IIO_VAL_FRACTIONAL_LOG2;
raw_temp = sign_extend32(raw_temp, 23);
*val = ((s64)raw_temp * 1000) / (1 << 16);
return IIO_VAL_INT;
}
static int bmp580_read_press(struct bmp280_data *data, int *val, int *val2)