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023e30fb0d
Add a property to allow changing the default power-saving mode. By default, at read raw the chip will activate and provide one measurent, then it will shut itself down. However, the chip can also work in "continuous" mode which may be more reliable but is also more power consuming. Signed-off-by: Adriana Reus <adriana.reus@intel.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
46 lines
2.0 KiB
Plaintext
46 lines
2.0 KiB
Plaintext
* UPISEMI us5182d I2C ALS and Proximity sensor
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Required properties:
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- compatible: must be "upisemi,usd5182"
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- reg: the I2C address of the device
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Optional properties:
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- upisemi,glass-coef: glass attenuation factor - compensation factor of
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resolution 1000 for material transmittance.
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- upisemi,dark-ths: array of 8 elements containing 16-bit thresholds (adc
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counts) corresponding to every scale.
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- upisemi,upper-dark-gain: 8-bit dark gain compensation factor(4 int and 4
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fractional bits - Q4.4) applied when light > threshold
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- upisemi,lower-dark-gain: 8-bit dark gain compensation factor(4 int and 4
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fractional bits - Q4.4) applied when light < threshold
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- upisemi,continuous: This chip has two power modes: one-shot (chip takes one
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measurement and then shuts itself down) and continuous (
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chip takes continuous measurements). The one-shot mode is
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more power-friendly but the continuous mode may be more
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reliable. If this property is specified the continuous
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mode will be used instead of the default one-shot one for
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raw reads.
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If the optional properties are not specified these factors will default to the
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values in the below example.
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The glass-coef defaults to no compensation for the covering material.
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The threshold array defaults to experimental values that work with US5182D
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sensor on evaluation board - roughly between 12-32 lux.
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There will be no dark-gain compensation by default when ALS > thresh
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(0 * dark-gain), and a 1.35 compensation factor when ALS < thresh.
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Example:
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usd5182@39 {
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compatible = "upisemi,usd5182";
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reg = <0x39>;
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upisemi,glass-coef = < 1000 >;
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upisemi,dark-ths = /bits/ 16 <170 200 512 512 800 2000 4000 8000>;
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upisemi,upper-dark-gain = /bits/ 8 <0x00>;
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upisemi,lower-dark-gain = /bits/ 8 <0x16>;
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};
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