71 lines
1.8 KiB
YAML
71 lines
1.8 KiB
YAML
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# Copyright (c) 2024 Chen Xingyu <hi@xingrz.me>
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Input driver for ADC attached resistor ladder buttons.
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The driver itself does not calculate each possible combination of resistor
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values. Instead, users are required to specify the voltage for each single
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key press or for combinations of key presses.
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Example:
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#include <dt-bindings/input/input-event-codes.h>
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/ {
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buttons {
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compatible = "adc-keys";
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io-channels = <&adc 2>;
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keyup-threshold-mv = <0>;
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key_0 {
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press-thresholds-mv = <1650>, /* KEY0 */
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<2536>; /* KEY0 + KEY1 */
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zephyr,code = <INPUT_KEY_0>;
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};
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key_1 {
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press-thresholds-mv = <2300>, /* KEY1 */
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<2536>; /* KEY0 + KEY1 */
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zephyr,code = <INPUT_KEY_1>;
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};
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};
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};
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compatible: "adc-keys"
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include: base.yaml
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properties:
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io-channels:
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type: phandle-array
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required: true
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description: Phandle to an ADC channel.
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sample-period-ms:
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type: int
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default: 20
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description: |
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Sample period in milliseconds.
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If not specified defaults to 20.
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keyup-threshold-mv:
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type: int
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required: true
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description: |
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Millivolt value to which all the keys are considered up.
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child-binding:
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description: ADC KEYS child node.
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properties:
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press-thresholds-mv:
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type: array
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required: true
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description: |
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Array of millivolt values to consider a key pressed.
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zephyr,code:
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type: int
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required: true
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description: Key code to emit.
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