mirror of https://gitee.com/openkylin/linux.git
20 lines
859 B
Plaintext
20 lines
859 B
Plaintext
|
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
|