FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/input/cap11xx.txt

     Device tree bindings for Microchip CAP11xx based capacitive touch sensors
     
     The node for this device must be a child of a I2C controller node, as the
     device communication via I2C only.
     
     Required properties:
     
             compatible:             Must contain one of:
                                             "microchip,cap1106"
                                            "microchip,cap1126"
                                            "microchip,cap1188"
    
            reg:                    The I2C slave address of the device.
    
            interrupts:             Property describing the interrupt line the
                                    device's ALERT#/CM_IRQ# pin is connected to.
                                    The device only has one interrupt source.
    
    Optional properties:
    
            autorepeat:             Enables the Linux input system's autorepeat
                                    feature on the input device.
    
            microchip,sensor-gain:  Defines the gain of the sensor circuitry. This
                                    effectively controls the sensitivity, as a
                                    smaller delta capacitance is required to
                                    generate the same delta count values.
                                    Valid values are 1, 2, 4, and 8.
                                    By default, a gain of 1 is set.
    
            microchip,irq-active-high:      By default the interrupt pin is active low
                                    open drain. This property allows using the active
                                    high push-pull output.
    
            linux,keycodes:         Specifies an array of numeric keycode values to
                                    be used for the channels. If this property is
                                    omitted, KEY_A, KEY_B, etc are used as
                                    defaults. The array must have exactly six
                                    entries.
    
    Example:
    
    i2c_controller {
            cap1106@28 {
                    compatible = "microchip,cap1106";
                    interrupt-parent = <&gpio1>;
                    interrupts = <0 0>;
                    reg = <0x28>;
                    autorepeat;
                    microchip,sensor-gain = <2>;
    
                    linux,keycodes = <103>,         /* KEY_UP */
                                     <106>,         /* KEY_RIGHT */
                                     <108>,         /* KEY_DOWN */
                                     <105>,         /* KEY_LEFT */
                                     <109>,         /* KEY_PAGEDOWN */
                                     <104>;         /* KEY_PAGEUP */
    
                    #address-cells = <1>;
                    #size-cells = <0>;
    
                    usr@0 {
                            label = "cap11xx:green:usr0";
                            reg = <0>;
                    };
    
                    usr@1 {
                            label = "cap11xx:green:usr1";
                            reg = <1>;
                    };
    
                    alive@2 {
                            label = "cap11xx:green:alive";
                            reg = <2>;
                            linux,default_trigger = "heartbeat";
                    };
            };
    }

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