1af06437dSBrian MasneyWhat: /sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression 2af06437dSBrian MasneyDate: January 2011 3af06437dSBrian MasneyKernelVersion: 2.6.37 4af06437dSBrian MasneyContact: linux-iio@vger.kernel.org 5af06437dSBrian MasneyDescription: 6af06437dSBrian Masney From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the 7af06437dSBrian Masney infrared suppression: 8af06437dSBrian Masney 9af06437dSBrian Masney Scheme 0, makes full n (4, 8, 12, 16) bits (unsigned) proximity 10af06437dSBrian Masney detection. The range of Scheme 0 proximity count is from 0 to 11af06437dSBrian Masney 2^n. Logic 1 of this bit, Scheme 1, makes n-1 (3, 7, 11, 15) 12af06437dSBrian Masney bits (2's complementary) proximity_less_ambient detection. The 13af06437dSBrian Masney range of Scheme 1 proximity count is from -2^(n-1) to 2^(n-1). 14af06437dSBrian Masney The sign bit is extended for resolutions less than 16. While 15af06437dSBrian Masney Scheme 0 has wider dynamic range, Scheme 1 proximity detection 16af06437dSBrian Masney is less affected by the ambient IR noise variation. 17af06437dSBrian Masney 1854a19b4dSMauro Carvalho Chehab == ============================================= 19af06437dSBrian Masney 0 Sensing IR from LED and ambient 20af06437dSBrian Masney 1 Sensing IR from LED with ambient IR rejection 2154a19b4dSMauro Carvalho Chehab == ============================================= 22