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Commit | Line | Data |
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af06437d BM |
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 |