LXR linux/Documentation/devicetree/bindings/input/cap11xx.txt

   1Device tree bindings for Microchip CAP11xx based capacitive touch sensors
   2
   3The node for this device must be a child of a I2C controller node, as the
   4device communication via I2C only.
   5
   6Required 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
  19Optional 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
  41Example:
  42
  43i2c_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}
  79