blob: 62b6c04703d827765956209e2fe41930dc8d5810 [file] [log] [blame]
# Copyright 2023 Google LLC
# SPDX-License-Identifier: Apache-2.0
description: |
ADC based analog axis input device
Implement an input device generating absolute axis events by periodically
reading from some ADC channels.
Example configuration:
#include <zephyr/dt-bindings/input/input-event-codes.h>
analog_axis {
compatible = "analog-axis";
poll-period-ms = <15>;
axis-x {
io-channels = <&adc 0>;
in-deadzone = <50>;
in-min = <100>;
in-max = <800>;
zephyr,axis = <INPUT_ABS_X>;
};
};
compatible: "analog-axis"
include: base.yaml
properties:
poll-period-ms:
type: int
default: 15
description: |
How often to get new ADC samples for the various configured axes in
milliseconds. Defaults to 15ms if unspecified.
child-binding:
properties:
io-channels:
type: phandle-array
required: true
description: |
ADC IO channel to use.
out-min:
type: int
default: 0
description: |
Minimum value to output on input events. Defaults to 0 if unspecified.
out-max:
type: int
default: 255
description: |
Maximum value to output on input events. Defaults to 255 if
unspecified.
in-deadzone:
type: int
default: 0
description: |
Deadzone for the input center value. If specified input values between
the center of the range plus or minus this value will be reported as
center. Defaults to 0, no deadzone.
in-min:
type: int
required: true
description: |
Input value that corresponds to the minimum output value.
in-max:
type: int
required: true
description: |
Input value that corresponds to the maximum output value.
zephyr,axis:
type: int
required: true
description: |
The input code for the axis to report for the device, typically any of
INPUT_ABS_*.
invert:
type: boolean
description: |
If set, invert the raw ADC value before processing it. Useful for
differential channels.