| Brian Masney | af06437 | 2016-10-10 03:20:01 -0400 | [diff] [blame] | 1 | What: /sys/bus/iio/devices/iio:deviceX/proximity_on_chip_ambient_infrared_suppression |
| 2 | Date: January 2011 |
| 3 | KernelVersion: 2.6.37 |
| 4 | Contact: linux-iio@vger.kernel.org |
| 5 | Description: |
| 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 | 0 Sensing IR from LED and ambient |
| 19 | 1 Sensing IR from LED with ambient IR rejection |