diff options
| author | Eva Rachel Retuya <eraretuya@gmail.com> | 2017-03-20 19:27:05 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-24 07:11:14 +0200 |
| commit | a1d51f7abf710729822bafeb82c664f6657a4db6 (patch) | |
| tree | 4d72376e161c4c179f338b1be6c6162a767c3dbc | |
| parent | 773fdcdc0957527577b2f1de994448894f1e3305 (diff) | |
staging: iio: tsl2x7x_core: Fix standard deviation calculation
commit cf6c77323a96fc40309cc8a4921ef206cccdd961 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: 3c97c08b5735 ("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>
| -rw-r--r-- | drivers/staging/iio/light/tsl2x7x_core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/iio/light/tsl2x7x_core.c b/drivers/staging/iio/light/tsl2x7x_core.c index ea15bc1c300c..197201a70d59 100644 --- a/drivers/staging/iio/light/tsl2x7x_core.c +++ b/drivers/staging/iio/light/tsl2x7x_core.c @@ -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); } /** |