162306a36Sopenharmony_ciWhat: /sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression 262306a36Sopenharmony_ciDate: January 2011 362306a36Sopenharmony_ciKernelVersion: 2.6.37 462306a36Sopenharmony_ciContact: linux-iio@vger.kernel.org 562306a36Sopenharmony_ciDescription: 662306a36Sopenharmony_ci From ISL29018 Data Sheet (FN6619.4, Oct 8, 2012) regarding the 762306a36Sopenharmony_ci infrared suppression: 862306a36Sopenharmony_ci 962306a36Sopenharmony_ci Scheme 0, makes full n (4, 8, 12, 16) bits (unsigned) proximity 1062306a36Sopenharmony_ci detection. The range of Scheme 0 proximity count is from 0 to 1162306a36Sopenharmony_ci 2^n. Logic 1 of this bit, Scheme 1, makes n-1 (3, 7, 11, 15) 1262306a36Sopenharmony_ci bits (2's complementary) proximity_less_ambient detection. The 1362306a36Sopenharmony_ci range of Scheme 1 proximity count is from -2^(n-1) to 2^(n-1). 1462306a36Sopenharmony_ci The sign bit is extended for resolutions less than 16. While 1562306a36Sopenharmony_ci Scheme 0 has wider dynamic range, Scheme 1 proximity detection 1662306a36Sopenharmony_ci is less affected by the ambient IR noise variation. 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ci == ============================================= 1962306a36Sopenharmony_ci 0 Sensing IR from LED and ambient 2062306a36Sopenharmony_ci 1 Sensing IR from LED with ambient IR rejection 2162306a36Sopenharmony_ci == ============================================= 22