On 12/04/17 00:59, Matt Ranostay wrote: > On Mon, Apr 10, 2017 at 10:00 AM, Andreas Klinger <ak@xxxxxxxxxxxxx> wrote: >> 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. >> >> Changes in v2: >> - cast also constants to signed; otherwise calculation is not correct >> >> I removed the Acked-By of Linus Walleij because of another change in the >> calculation. Don't know how it should be treated. >> >> Signed-off-by: Andreas Klinger <ak@xxxxxxxxxxxxx> > > Reviewed-by: Matt Ranostay <matt.ranostay@xxxxxxxxxxxx> Applied to the fixes-togreg branch of iio.git and marked for stable. Thanks, Jonathan > >> --- >> drivers/iio/pressure/bmp280-core.c | 11 ++++++----- >> 1 file changed, 6 insertions(+), 5 deletions(-) >> >> diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c >> index 4d18826ac63c..d82b788374b6 100644 >> --- a/drivers/iio/pressure/bmp280-core.c >> +++ b/drivers/iio/pressure/bmp280-core.c >> @@ -175,11 +175,12 @@ static u32 bmp280_compensate_humidity(struct bmp280_data *data, >> } >> H6 = sign_extend32(tmp, 7); >> >> - var = ((s32)data->t_fine) - 76800; >> - var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var)) + 16384) >> 15) >> - * (((((((var * H6) >> 10) * (((var * H3) >> 11) + 32768)) >> 10) >> - + 2097152) * H2 + 8192) >> 14); >> - var -= ((((var >> 15) * (var >> 15)) >> 7) * H1) >> 4; >> + var = ((s32)data->t_fine) - (s32)76800; >> + var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var)) >> + + (s32)16384) >> 15) * (((((((var * H6) >> 10) >> + * (((var * (s32)H3) >> 11) + (s32)32768)) >> 10) >> + + (s32)2097152) * H2 + 8192) >> 14); >> + var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)H1) >> 4; >> >> return var >> 12; >> }; >> -- >> 2.1.4 >> >> >> -- -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
