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