analog-axis
Vendor: Generic or vendor-independent
Note
An implementation of a driver matching this compatible is available in drivers/input/input_analog_axis.c.
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>;
};
};
Properties
Top level properties
These property descriptions apply to “analog-axis” nodes themselves. This page also describes child node properties in the following sections.
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
|
|
How often to get new ADC samples for the various configured axes in
milliseconds. Defaults to 15ms if unspecified.
Default value: |
Deprecated properties not inherited from the base binding file.
(None)
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “analog-axis” compatible.
Name |
Type |
Details |
|---|---|---|
|
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indicates the operational status of a device
Legal values: See Important properties for more information. |
|
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compatible strings
This property is required. See Important properties for more information. |
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register space
See Important properties for more information. |
|
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name of each register space
|
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interrupts for device
See Important properties for more information. |
|
|
extended interrupt specifier for device
|
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name of each interrupt
|
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phandle to interrupt controller node
|
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No description provided for this label
See Important properties for more information. |
|
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Clock gate information
|
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|
name of each clock
|
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number of address cells in reg property
|
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number of size cells in reg property
|
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DMA channels specifiers
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Provided names of DMA channel specifiers
|
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IO channels specifiers
|
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Provided names of IO channel specifiers
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mailbox / IPM channels specifiers
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Provided names of mailbox / IPM channel specifiers
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Power domain specifiers
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Provided names of power domain specifiers
|
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Number of cells in power-domains property
|
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
|
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|
Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
|
|
|
Automatically configure the device for runtime power management after the
init function runs.
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List of power states that will disable this device power.
|
Child node properties
Name |
Type |
Details |
|---|---|---|
|
|
ADC IO channel to use.
This property is required. |
|
|
Minimum value to output on input events. Defaults to 0 if unspecified.
|
|
|
Maximum value to output on input events. Defaults to 255 if
unspecified.
Default value: |
|
|
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.
|
|
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Input value that corresponds to the minimum output value.
This property is required. |
|
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Input value that corresponds to the maximum output value.
This property is required. |
|
|
The input code for the axis to report for the device, typically any of
INPUT_ABS_*.
This property is required. |
|
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If set, invert the raw ADC value before processing it. Useful for
differential channels.
|
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|
If set, invert the output value.
|