On 07/10/16 01:48, Brian Masney wrote: > Add documentation from the ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) > about the infrared suppression that can be controlled > with the proximity_on_chip_ambient_infrared_suppression sysfs attribute. > > Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx> > --- > drivers/staging/iio/light/isl29018.c | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) > > diff --git a/drivers/staging/iio/light/isl29018.c b/drivers/staging/iio/light/isl29018.c > index 51226bd..52bfb1cb 100644 > --- a/drivers/staging/iio/light/isl29018.c > +++ b/drivers/staging/iio/light/isl29018.c > @@ -307,6 +307,24 @@ static ssize_t in_illuminance_integration_time_available_show > return len; > } > > +/* > + * From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the > + * infrared suppression: > + * > + * Proximity Sensing Scheme: Bit 7. This bit programs the function > + * of the proximity detection. Logic 0 of this bit, Scheme 0, makes > + * full n (4, 8, 12, 16) bits (unsigned) proximity detection. The range > + * of Scheme 0 proximity count is from 0 to 2^n. Logic 1 of this bit, > + * Scheme 1, makes n-1 (3, 7, 11, 15) bits (2's complementary) > + * proximity_less_ambient detection. The range of Scheme 1 > + * proximity count is from -2^(n-1) to 2^(n-1) . The sign bit is extended > + * for resolutions less than 16. While Scheme 0 has wider dynamic > + * range, Scheme 1 proximity detection is less affected by the > + * ambient IR noise variation. > + * > + * 0 Sensing IR from LED and ambient > + * 1 Sensing IR from LED with ambient IR rejection > + */ Hi Brian, This is good stuff, but the home of ABI docs (where it 'has' to be as opposed to here where it is nice to have) is Documentation/ABI/testing/sysfs-bus-iio-* (here isl29018 until we see if this becomes generic enough to promote to a more generic file) Jonathan > static ssize_t proximity_on_chip_ambient_infrared_suppression_show > (struct device *dev, struct device_attribute *attr, > char *buf) > -- 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
