On 10/10/16 08:20, Brian Masney wrote: > Add ABI 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> I'm going to let this and the final move out of staging sit on the list a while longer to gather reviews. It does feel like the below is rather cryptic and it might be possible to use a simpler description... Maybe this is the best we can do. The naming makes it sound generic, but in reality it's a nasty bit of custom filtering that is not well described anywhere. Jonathan > --- > .../ABI/testing/sysfs-bus-iio-light-isl29018 | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-light-isl29018 > > diff --git a/Documentation/ABI/testing/sysfs-bus-iio-light-isl29018 b/Documentation/ABI/testing/sysfs-bus-iio-light-isl29018 > new file mode 100644 > index 0000000..f0ce0a0 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-bus-iio-light-isl29018 > @@ -0,0 +1,19 @@ > +What: /sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression > +Date: January 2011 > +KernelVersion: 2.6.37 > +Contact: linux-iio@xxxxxxxxxxxxxxx > +Description: > + From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the > + infrared suppression: > + > + 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 > _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
