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staging: iio: isl29018: add ABI documentation for infrared suppression 

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@onstation.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Brian Masney 2016-10-10 03:20:01 -04:00 committed by Jonathan Cameron
parent ac13980584
commit af06437dae
1 changed files with 19 additions and 0 deletions
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What: /sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression
Date: January 2011
KernelVersion: 2.6.37
Contact: linux-iio@vger.kernel.org
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