adc-keys.txt

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    1 ADC attached resistor ladder buttons
    2 ------------------------------------
    3 
    4 Required properties:
    5  - compatible: "adc-keys"
    6  - io-channels: Phandle to an ADC channel
    7  - io-channel-names = "buttons";
    8  - keyup-threshold-microvolt: Voltage above or equal to which all the keys are
    9                               considered up.
   10 
   11 Optional properties:
   12         - poll-interval: Poll interval time in milliseconds
   13         - autorepeat: Boolean, Enable auto repeat feature of Linux input
   14           subsystem.
   15 
   16 Each button (key) is represented as a sub-node of "adc-keys":
   17 
   18 Required subnode-properties:
   19         - label: Descriptive name of the key.
   20         - linux,code: Keycode to emit.
   21         - press-threshold-microvolt: voltage above or equal to which this key is
   22                                      considered pressed.
   23 
   24 No two values of press-threshold-microvolt may be the same.
   25 All values of press-threshold-microvolt must be less than
   26 keyup-threshold-microvolt.
   27 
   28 Example:
   29 
   30 #include <dt-bindings/input/input.h>
   31 
   32         adc-keys {
   33                 compatible = "adc-keys";
   34                 io-channels = <&lradc 0>;
   35                 io-channel-names = "buttons";
   36                 keyup-threshold-microvolt = <2000000>;
   37 
   38                 button-up {
   39                         label = "Volume Up";
   40                         linux,code = <KEY_VOLUMEUP>;
   41                         press-threshold-microvolt = <1500000>;
   42                 };
   43 
   44                 button-down {
   45                         label = "Volume Down";
   46                         linux,code = <KEY_VOLUMEDOWN>;
   47                         press-threshold-microvolt = <1000000>;
   48                 };
   49 
   50                 button-enter {
   51                         label = "Enter";
   52                         linux,code = <KEY_ENTER>;
   53                         press-threshold-microvolt = <500000>;
   54                 };
   55         };
   56 
   57 +--------------------------------+------------------------+
   58 | 2.000.000 <= value             | no key pressed         |
   59 +--------------------------------+------------------------+
   60 | 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed   |
   61 +--------------------------------+------------------------+
   62 | 1.000.000 <= value < 1.500.000 | KEY_VOLUMEDOWN pressed |
   63 +--------------------------------+------------------------+
   64 |   500.000 <= value < 1.000.000 | KEY_ENTER pressed      |
   65 +--------------------------------+------------------------+
   66 |              value <   500.000 | no key pressed         |
   67 +--------------------------------+------------------------+

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

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