From dee2dabc0e4115b80945fe2c91603e634f4b4686 Mon Sep 17 00:00:00 2001
From: Andreas Klinger <ak@it-klinger.de>
Date: Mon, 4 May 2020 20:10:34 +0200
Subject: [PATCH] iio: bmp280: fix compensation of humidity
Git-commit: dee2dabc0e4115b80945fe2c91603e634f4b4686
Patch-mainline: v5.8-rc1
References: git-fixes
Limit the output of humidity compensation to the range between 0 and 100
percent.
Depending on the calibration parameters of the individual sensor it
happens, that a humidity above 100 percent or below 0 percent is
calculated, which don't make sense in terms of relative humidity.
Add a clamp to the compensation formula as described in the datasheet of
the sensor in chapter 4.2.3.
Although this clamp is documented, it was never in the driver of the
kernel.
It depends on the circumstances (calibration parameters, temperature,
humidity) if one can see a value above 100 percent without the clamp.
The writer of this patch was working with this type of sensor without
noting this error. So it seems to be a rare event when this bug occures.
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/iio/pressure/bmp280-core.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -182,6 +182,8 @@ static u32 bmp280_compensate_humidity(st
+ (s32)2097152) * H2 + 8192) >> 14);
var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)H1) >> 4;
+ var = clamp_val(var, 0, 419430400);
+
return var >> 12;
};