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staging: iio: tsl2x7x_core: Fix standard deviation calculation 

commit cf6c77323a upstream.

Standard deviation is calculated as the square root of the variance
where variance is the mean of sample_sum and length. Correct the
computation of statP->stddev in accordance to the proper calculation.

Fixes: 3c97c08b57 ("staging: iio: add TAOS tsl2x7x driver")
Reported-by: Abhiram Balasubramanian <abhiram@cs.utah.edu>
Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eva Rachel Retuya 2017-03-20 19:27:05 +08:00 committed by Greg Kroah-Hartman
parent 773fdcdc09
commit a1d51f7abf
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/iio/light/tsl2x7x_core.c
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@ -854,7 +854,7 @@ void tsl2x7x_prox_calculate(int *data, int length,
tmp = data[i] - statP->mean;
sample_sum += tmp * tmp;
}
statP->stddev = int_sqrt((long)sample_sum) / length;
statP->stddev = int_sqrt((long)sample_sum / length);
}
/**