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