The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/iio/light/us5182d.txt

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    1 * UPISEMI us5182d I2C ALS and Proximity sensor
    2 
    3 Required properties:
    4 - compatible: must be "upisemi,usd5182"
    5 - reg: the I2C address of the device
    6 
    7 Optional properties:
    8 - upisemi,glass-coef: glass attenuation factor - compensation factor of
    9                       resolution 1000 for material transmittance.
   10 
   11 - upisemi,dark-ths: array of 8 elements containing 16-bit thresholds (adc
   12                     counts) corresponding to every scale.
   13 
   14 - upisemi,upper-dark-gain: 8-bit dark gain compensation factor(4 int and 4
   15                            fractional bits - Q4.4) applied when light > threshold
   16 
   17 - upisemi,lower-dark-gain: 8-bit dark gain compensation factor(4 int and 4
   18                            fractional bits - Q4.4) applied when light < threshold
   19 
   20 - upisemi,continuous: This chip has two power modes: one-shot (chip takes one
   21                       measurement and then shuts itself down) and continuous (
   22                       chip takes continuous measurements). The one-shot mode is
   23                       more power-friendly but the continuous mode may be more
   24                       reliable. If this property is specified the continuous
   25                       mode will be used instead of the default one-shot one for
   26                       raw reads.
   27 
   28 If the optional properties are not specified these factors will default to the
   29 values in the below example.
   30 The glass-coef defaults to no compensation for the covering material.
   31 The threshold array defaults to experimental values that work with US5182D
   32 sensor on evaluation board - roughly between 12-32 lux.
   33 There will be no dark-gain compensation by default when ALS > thresh
   34 (0 * dark-gain), and a 1.35 compensation factor when ALS < thresh.
   35 
   36 Example:
   37 
   38     usd5182@39 {
   39                 compatible = "upisemi,usd5182";
   40                 reg = <0x39>;
   41                 upisemi,glass-coef = < 1000 >;
   42                 upisemi,dark-ths = /bits/ 16 <170 200 512 512 800 2000 4000 8000>;
   43                 upisemi,upper-dark-gain = /bits/ 8 <0x00>;
   44                 upisemi,lower-dark-gain = /bits/ 8 <0x16>;
   45     };

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