| 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 |