1What: /sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression 2Date: January 2011 3KernelVersion: 2.6.37 4Contact: linux-iio@vger.kernel.org 5Description: 6 From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the 7 infrared suppression: 8 9 Scheme 0, makes full n (4, 8, 12, 16) bits (unsigned) proximity 10 detection. The range of Scheme 0 proximity count is from 0 to 11 2^n. Logic 1 of this bit, Scheme 1, makes n-1 (3, 7, 11, 15) 12 bits (2's complementary) proximity_less_ambient detection. The 13 range of Scheme 1 proximity count is from -2^(n-1) to 2^(n-1). 14 The sign bit is extended for resolutions less than 16. While 15 Scheme 0 has wider dynamic range, Scheme 1 proximity detection 16 is less affected by the ambient IR noise variation. 17 18 == ============================================= 19 0 Sensing IR from LED and ambient 20 1 Sensing IR from LED with ambient IR rejection 21 == ============================================= 22