Documentation/devicetree/bindings/input/cap1106.txt

   1 Device tree bindings for Microchip CAP1106, 6 channel capacitive touch sensor
   2
   3 The node for this driver must be a child of a I2C controller node, as the
   4 device communication via I2C only.
   5
   6 Required properties:
   7
   8         compatible:             Must be "microchip,cap1106"
   9
  10         reg:                    The I2C slave address of the device.
  11                                 Only 0x28 is valid.
  12
  13         interrupts:             Property describing the interrupt line the
  14                                 device's ALERT#/CM_IRQ# pin is connected to.
  15                                 The device only has one interrupt source.
  16
  17 Optional properties:
  18
  19         autorepeat:             Enables the Linux input system's autorepeat
  20                                 feature on the input device.
  21
  22         microchip,sensor-gain:  Defines the gain of the sensor circuitry. This
  23                                 effectively controls the sensitivity, as a
  24                                 smaller delta capacitance is required to
  25                                 generate the same delta count values.
  26                                 Valid values are 1, 2, 4, and 8.
  27                                 By default, a gain of 1 is set.
  28
  29         linux,keycodes:         Specifies an array of numeric keycode values to
  30                                 be used for the channels. If this property is
  31                                 omitted, KEY_A, KEY_B, etc are used as
  32                                 defaults. The array must have exactly six
  33                                 entries.
  34
  35 Example:
  36
  37 i2c_controller {
  38         cap1106@28 {
  39                 compatible = "microchip,cap1106";
  40                 interrupt-parent = <&gpio1>;
  41                 interrupts = <0 0>;
  42                 reg = <0x28>;
  43                 autorepeat;
  44                 microchip,sensor-gain = <2>;
  45
  46                 linux,keycodes = <103           /* KEY_UP */
  47                                   106           /* KEY_RIGHT */
  48                                   108           /* KEY_DOWN */
  49                                   105           /* KEY_LEFT */
  50                                   109           /* KEY_PAGEDOWN */
  51                                   104>;         /* KEY_PAGEUP */
  52         };
  53 }