Add a binding document for a generic ADC keypad. Buttons on an ADC keypad are connected in a resistor ladder to an ADC. The binding describes the mapping of ADC channel and voltage ranges to buttons.
Signed-off-by: Andrew Bresticker <[email protected]> Cc: Rob Herring <[email protected]> Cc: Pawel Moll <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Ian Campbell <[email protected]> Cc: Kumar Gala <[email protected]> --- .../devicetree/bindings/input/adc-keys.txt | 43 ++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/adc-keys.txt diff --git a/Documentation/devicetree/bindings/input/adc-keys.txt b/Documentation/devicetree/bindings/input/adc-keys.txt new file mode 100644 index 0000000..c9a57de --- /dev/null +++ b/Documentation/devicetree/bindings/input/adc-keys.txt @@ -0,0 +1,43 @@ +Generic ADC keypad +================== + +Required properties: + - compatible: "adc-keys" + - poll-interval: Polling interval time in ms. + - io-channels: List of IIO channels used by the keypad. + See ../iio/iio-bindings.txt for details. + +Optional properties: + - autorepeat: Enable auto-repeat. + +Each button on the ADC keypad is represented by a sub-node. + +Required sub-node properties: + - label: Descriptive name for the key. + - linux,code: Keycode to emit. + - channel: IIO channel (index into the 'io-channels' above) to which this + button is attached. + - min-voltage: Minimum voltage in uV when this key is pressed. + - max-voltage: Maximum voltage in uV when this key is pressed. + +Optional sub-node properties: + - linux,input-type: Event type this key generates. Defaults to 1 (EV_KEY) if + not specified. + +Example: + +adc-keypad { + compatible = "adc-keys"; + poll-interval = <100>; + io-channels = <&adc 0>, <&adc 1>; + + vol-up-button { + label = "Volume Up"; + linux,code = <KEY_VOLUMEUP>; + channel = <0>; + min-voltage = <1600000>; + max-voltage = <1640000>; + }; + + ... +}; -- 2.2.0.rc0.207.ga3a616c -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
