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123 lines
3.3 KiB
YAML
123 lines
3.3 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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# Copyright 2019-2020 Artur Rojek
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%YAML 1.2
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---
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$id: "http://devicetree.org/schemas/input/adc-joystick.yaml#"
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$schema: "http://devicetree.org/meta-schemas/core.yaml#"
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title: ADC attached joystick
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maintainers:
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- Artur Rojek <contact@artur-rojek.eu>
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description: >
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Bindings for joystick devices connected to ADC controllers supporting
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the Industrial I/O subsystem.
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properties:
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compatible:
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const: adc-joystick
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io-channels:
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minItems: 1
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maxItems: 1024
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description: >
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List of phandle and IIO specifier pairs.
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Each pair defines one ADC channel to which a joystick axis is connected.
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See
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https://github.com/devicetree-org/dt-schema/blob/master/schemas/iio/iio-consumer.yaml
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for details.
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'#address-cells':
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const: 1
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'#size-cells':
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const: 0
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required:
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- compatible
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- io-channels
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- '#address-cells'
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- '#size-cells'
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additionalProperties: false
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patternProperties:
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"^axis@[0-9a-f]+$":
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type: object
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description: >
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Represents a joystick axis bound to the given ADC channel.
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For each entry in the io-channels list, one axis subnode with a matching
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reg property must be specified.
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properties:
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reg:
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minimum: 0
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maximum: 1023
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description: Index of an io-channels list entry bound to this axis.
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linux,code:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: EV_ABS specific event code generated by the axis.
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abs-range:
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$ref: /schemas/types.yaml#/definitions/uint32-array
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items:
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- description: minimum value
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- description: maximum value
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description: >
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Minimum and maximum values produced by the axis.
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For an ABS_X axis this will be the left-most and right-most
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inclination of the joystick. If min > max, it is left to userspace to
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treat the axis as inverted.
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This property is interpreted as two signed 32 bit values.
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abs-fuzz:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: >
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Amount of noise in the input value.
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Omitting this property indicates the axis is precise.
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abs-flat:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: >
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Axial "deadzone", or area around the center position, where the axis
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is considered to be at rest.
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Omitting this property indicates the axis always returns to exactly
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the center position.
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required:
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- reg
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- linux,code
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- abs-range
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/iio/adc/ingenic,adc.h>
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#include <dt-bindings/input/input.h>
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joystick: adc-joystick {
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compatible = "adc-joystick";
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io-channels = <&adc INGENIC_ADC_TOUCH_XP>,
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<&adc INGENIC_ADC_TOUCH_YP>;
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#address-cells = <1>;
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#size-cells = <0>;
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axis@0 {
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reg = <0>;
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linux,code = <ABS_X>;
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abs-range = <3300 0>;
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abs-fuzz = <4>;
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abs-flat = <200>;
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};
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axis@1 {
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reg = <1>;
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linux,code = <ABS_Y>;
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abs-range = <0 3300>;
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abs-fuzz = <4>;
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abs-flat = <200>;
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};
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};
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