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103 lines
2.7 KiB
103 lines
2.7 KiB
# 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 <[email protected]> |
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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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