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# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/adc-keys.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ADC attached resistor ladder buttons
maintainers:
- Alexandre Belloni <alexandre.belloni@bootlin.com>
allOf:
- $ref: input.yaml#
properties:
compatible:
const: adc-keys
io-channels:
maxItems: 1
io-channel-names:
const: buttons
keyup-threshold-microvolt:
description:
Voltage above or equal to which all the keys are considered up.
poll-interval: true
autorepeat: true
patternProperties:
'^button-':
type: object
$ref: input.yaml#
additionalProperties: false
description:
Each button (key) is represented as a sub-node.
properties:
label: true
linux,code: true
press-threshold-microvolt:
description:
Voltage above or equal to which this key is considered pressed. No
two values of press-threshold-microvolt may be the same. All values
of press-threshold-microvolt must be less than
keyup-threshold-microvolt.
required:
- linux,code
- press-threshold-microvolt
required:
- compatible
- io-channels
- io-channel-names
- keyup-threshold-microvolt
additionalProperties: false
examples:
- |
#include <dt-bindings/input/input.h>
// +--------------------------------+------------------------+
// | 2.000.000 <= value | no key pressed |
// +--------------------------------+------------------------+
// | 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed |
// +--------------------------------+------------------------+
// | 1.000.000 <= value < 1.500.000 | KEY_VOLUMEDOWN pressed |
// +--------------------------------+------------------------+
// | 500.000 <= value < 1.000.000 | KEY_ENTER pressed |
// +--------------------------------+------------------------+
// | value < 500.000 | no key pressed |
// +--------------------------------+------------------------+
adc-keys {
compatible = "adc-keys";
io-channels = <&lradc 0>;
io-channel-names = "buttons";
keyup-threshold-microvolt = <2000000>;
button-up {
label = "Volume Up";
linux,code = <KEY_VOLUMEUP>;
press-threshold-microvolt = <1500000>;
};
button-down {
label = "Volume Down";
linux,code = <KEY_VOLUMEDOWN>;
press-threshold-microvolt = <1000000>;
};
button-enter {
label = "Enter";
linux,code = <KEY_ENTER>;
press-threshold-microvolt = <500000>;
};
};
...
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