| 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 |
| == ============================================= |
