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Diffstat (limited to 'Documentation/devicetree/bindings/input/adc-keys.txt')
-rw-r--r-- | Documentation/devicetree/bindings/input/adc-keys.txt | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/Documentation/devicetree/bindings/input/adc-keys.txt b/Documentation/devicetree/bindings/input/adc-keys.txt deleted file mode 100644 index 6c8be6a9ace2..000000000000 --- a/Documentation/devicetree/bindings/input/adc-keys.txt +++ /dev/null @@ -1,67 +0,0 @@ -ADC attached resistor ladder buttons ------------------------------------- - -Required properties: - - compatible: "adc-keys" - - io-channels: Phandle to an ADC channel - - io-channel-names = "buttons"; - - keyup-threshold-microvolt: Voltage above or equal to which all the keys are - considered up. - -Optional properties: - - poll-interval: Poll interval time in milliseconds - - autorepeat: Boolean, Enable auto repeat feature of Linux input - subsystem. - -Each button (key) is represented as a sub-node of "adc-keys": - -Required subnode-properties: - - label: Descriptive name of the key. - - linux,code: Keycode to emit. - - press-threshold-microvolt: voltage above or equal to which this key is - considered pressed. - -No two values of press-threshold-microvolt may be the same. -All values of press-threshold-microvolt must be less than -keyup-threshold-microvolt. - -Example: - -#include <dt-bindings/input/input.h> - - adc-keys { - compatible = "adc-keys"; - io-channels = <&lradc 0>; - io-channel-names = "buttons"; - keyup-threshold-microvolt = <2000000>; - - button-up { - label = "Volume Up"; - linux,code = <KEY_VOLUMEUP>; - press-threshold-microvolt = <1500000>; - }; - - button-down { - label = "Volume Down"; - linux,code = <KEY_VOLUMEDOWN>; - press-threshold-microvolt = <1000000>; - }; - - button-enter { - label = "Enter"; - linux,code = <KEY_ENTER>; - press-threshold-microvolt = <500000>; - }; - }; - -+--------------------------------+------------------------+ -| 2.000.000 <= value | no key pressed | -+--------------------------------+------------------------+ -| 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed | -+--------------------------------+------------------------+ -| 1.000.000 <= value < 1.500.000 | KEY_VOLUMEDOWN pressed | -+--------------------------------+------------------------+ -| 500.000 <= value < 1.000.000 | KEY_ENTER pressed | -+--------------------------------+------------------------+ -| value < 500.000 | no key pressed | -+--------------------------------+------------------------+ |