adc-keys.yaml

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    1 # SPDX-License-Identifier: GPL-2.0
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/input/adc-keys.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: ADC attached resistor ladder buttons
    8 
    9 maintainers:
   10   - Alexandre Belloni <alexandre.belloni@bootlin.com>
   11 
   12 allOf:
   13   - $ref: input.yaml#
   14 
   15 properties:
   16   compatible:
   17     const: adc-keys
   18 
   19   io-channels:
   20     maxItems: 1
   21 
   22   io-channel-names:
   23     const: buttons
   24 
   25   keyup-threshold-microvolt:
   26     description:
   27       Voltage above or equal to which all the keys are considered up.
   28 
   29   poll-interval: true
   30   autorepeat: true
   31 
   32 patternProperties:
   33   '^button-':
   34     type: object
   35     $ref: input.yaml#
   36     additionalProperties: false
   37     description:
   38       Each button (key) is represented as a sub-node.
   39 
   40     properties:
   41       label: true
   42 
   43       linux,code: true
   44 
   45       press-threshold-microvolt:
   46         description:
   47           Voltage above or equal to which this key is considered pressed. No
   48           two values of press-threshold-microvolt may be the same. All values
   49           of press-threshold-microvolt must be less than
   50           keyup-threshold-microvolt.
   51 
   52     required:
   53       - linux,code
   54       - press-threshold-microvolt
   55 
   56 required:
   57   - compatible
   58   - io-channels
   59   - io-channel-names
   60   - keyup-threshold-microvolt
   61 
   62 additionalProperties: false
   63 
   64 examples:
   65   - |
   66     #include <dt-bindings/input/input.h>
   67     // +--------------------------------+------------------------+
   68     // | 2.000.000 <= value             | no key pressed         |
   69     // +--------------------------------+------------------------+
   70     // | 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed   |
   71     // +--------------------------------+------------------------+
   72     // | 1.000.000 <= value < 1.500.000 | KEY_VOLUMEDOWN pressed |
   73     // +--------------------------------+------------------------+
   74     // |   500.000 <= value < 1.000.000 | KEY_ENTER pressed      |
   75     // +--------------------------------+------------------------+
   76     // |              value <   500.000 | no key pressed         |
   77     // +--------------------------------+------------------------+
   78 
   79     adc-keys {
   80         compatible = "adc-keys";
   81         io-channels = <&lradc 0>;
   82         io-channel-names = "buttons";
   83         keyup-threshold-microvolt = <2000000>;
   84 
   85         button-up {
   86             label = "Volume Up";
   87             linux,code = <KEY_VOLUMEUP>;
   88             press-threshold-microvolt = <1500000>;
   89         };
   90 
   91         button-down {
   92             label = "Volume Down";
   93             linux,code = <KEY_VOLUMEDOWN>;
   94             press-threshold-microvolt = <1000000>;
   95         };
   96 
   97         button-enter {
   98             label = "Enter";
   99             linux,code = <KEY_ENTER>;
  100             press-threshold-microvolt = <500000>;
  101         };
  102     };
  103 ...

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/input/adc-keys.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/input/adc-keys.yaml