Documentation/devicetree/bindings/input/cap11xx.txt

   1 Device tree bindings for Microchip CAP11xx based capacitive touch sensors
   2
   3 The node for this device 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 contain one of:
   9                                         "microchip,cap1106"
  10                                         "microchip,cap1126"
  11                                         "microchip,cap1188"
  12
  13         reg:                    The I2C slave address of the device.
  14
  15         interrupts:             Property describing the interrupt line the
  16                                 device's ALERT#/CM_IRQ# pin is connected to.
  17                                 The device only has one interrupt source.
  18
  19 Optional properties:
  20
  21         autorepeat:             Enables the Linux input system's autorepeat
  22                                 feature on the input device.
  23
  24         microchip,sensor-gain:  Defines the gain of the sensor circuitry. This
  25                                 effectively controls the sensitivity, as a
  26                                 smaller delta capacitance is required to
  27                                 generate the same delta count values.
  28                                 Valid values are 1, 2, 4, and 8.
  29                                 By default, a gain of 1 is set.
  30
  31         microchip,irq-active-high:      By default the interrupt pin is active low
  32                                 open drain. This property allows using the active
  33                                 high push-pull output.
  34
  35         linux,keycodes:         Specifies an array of numeric keycode values to
  36                                 be used for the channels. If this property is
  37                                 omitted, KEY_A, KEY_B, etc are used as
  38                                 defaults. The array must have exactly six
  39                                 entries.
  40
  41 Example:
  42
  43 i2c_controller {
  44         cap1106@28 {
  45                 compatible = "microchip,cap1106";
  46                 interrupt-parent = <&gpio1>;
  47                 interrupts = <0 0>;
  48                 reg = <0x28>;
  49                 autorepeat;
  50                 microchip,sensor-gain = <2>;
  51
  52                 linux,keycodes = <103>,         /* KEY_UP */
  53                                  <106>,         /* KEY_RIGHT */
  54                                  <108>,         /* KEY_DOWN */
  55                                  <105>,         /* KEY_LEFT */
  56                                  <109>,         /* KEY_PAGEDOWN */
  57                                  <104>;         /* KEY_PAGEUP */
  58
  59                 #address-cells = <1>;
  60                 #size-cells = <0>;
  61
  62                 usr@0 {
  63                         label = "cap11xx:green:usr0";
  64                         reg = <0>;
  65                 };
  66
  67                 usr@1 {
  68                         label = "cap11xx:green:usr1";
  69                         reg = <1>;
  70                 };
  71
  72                 alive@2 {
  73                         label = "cap11xx:green:alive";
  74                         reg = <2>;
  75                         linux,default_trigger = "heartbeat";
  76                 };
  77         };
  78 }