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IIO: bmp280-core.c: fix error in humidity calculation
While calculating the compensation of the humidity there are negative values interpreted as unsigned because of unsigned variables used. These values as well as the constants need to be casted to signed as indicated by the documentation of the sensor. Signed-off-by: Andreas Klinger <ak@it-klinger.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -175,11 +175,12 @@ static u32 bmp280_compensate_humidity(struct bmp280_data *data,
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}
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H6 = sign_extend32(tmp, 7);
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var = ((s32)data->t_fine) - 76800;
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var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var)) + 16384) >> 15)
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* (((((((var * H6) >> 10) * (((var * H3) >> 11) + 32768)) >> 10)
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+ 2097152) * H2 + 8192) >> 14);
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var -= ((((var >> 15) * (var >> 15)) >> 7) * H1) >> 4;
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var = ((s32)data->t_fine) - (s32)76800;
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var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var))
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+ (s32)16384) >> 15) * (((((((var * H6) >> 10)
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* (((var * (s32)H3) >> 11) + (s32)32768)) >> 10)
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+ (s32)2097152) * H2 + 8192) >> 14);
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var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)H1) >> 4;
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return var >> 12;
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};
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