Bindings/input/microchip,cap11xx.yaml

   1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/input/microchip,cap11xx.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Microchip CAP11xx based capacitive touch sensors
   8
   9 description: |
  10   The Microchip CAP1xxx Family of RightTouchTM multiple-channel capacitive
  11   touch controllers and LED drivers. The device communication via I2C only.
  12
  13 maintainers:
  14   - Rob Herring <robh@kernel.org>
  15
  16 properties:
  17   compatible:
  18     enum:
  19       - microchip,cap1106
  20       - microchip,cap1126
  21       - microchip,cap1188
  22       - microchip,cap1203
  23       - microchip,cap1206
  24       - microchip,cap1293
  25       - microchip,cap1298
  26
  27   reg:
  28     maxItems: 1
  29
  30   '#address-cells':
  31     const: 1
  32
  33   '#size-cells':
  34     const: 0
  35
  36   interrupts:
  37     maxItems: 1
  38     description: |
  39       Property describing the interrupt line the
  40       device's ALERT#/CM_IRQ# pin is connected to.
  41       The device only has one interrupt source.
  42
  43   autorepeat:
  44     description: |
  45       Enables the Linux input system's autorepeat feature on the input device.
  46
  47   linux,keycodes:
  48     minItems: 3
  49     maxItems: 8
  50     description: |
  51       Specifies an array of numeric keycode values to
  52       be used for the channels. If this property is
  53       omitted, KEY_A, KEY_B, etc are used as defaults.
  54       The number of entries must correspond to the number of channels.
  55
  56   microchip,sensor-gain:
  57     $ref: /schemas/types.yaml#/definitions/uint32
  58     default: 1
  59     enum: [1, 2, 4, 8]
  60     description: |
  61       Defines the gain of the sensor circuitry. This
  62       effectively controls the sensitivity, as a
  63       smaller delta capacitance is required to
  64       generate the same delta count values.
  65
  66   microchip,irq-active-high:
  67     type: boolean
  68     description: |
  69       By default the interrupt pin is active low
  70       open drain. This property allows using the active
  71       high push-pull output.
  72
  73   microchip,sensitivity-delta-sense:
  74     $ref: /schemas/types.yaml#/definitions/uint32
  75     default: 32
  76     enum: [1, 2, 4, 8, 16, 32, 64, 128]
  77     description:
  78       Controls the sensitivity multiplier of a touch detection.
  79       Higher value means more sensitive settings.
  80       At the more sensitive settings, touches are detected for a smaller delta
  81       capacitance corresponding to a "lighter" touch.
  82
  83   microchip,signal-guard:
  84     $ref: /schemas/types.yaml#/definitions/uint32-array
  85     minItems: 3
  86     maxItems: 8
  87     items:
  88       enum: [0, 1]
  89     description: |
  90       0 - off
  91       1 - on
  92       The signal guard isolates the signal from virtual grounds.
  93       If enabled then the behavior of the channel is changed to signal guard.
  94       The number of entries must correspond to the number of channels.
  95
  96   microchip,input-threshold:
  97     $ref: /schemas/types.yaml#/definitions/uint32-array
  98     minItems: 3
  99     maxItems: 8
 100     items:
 101       minimum: 0
 102       maximum: 127
 103     description:
 104       Specifies the delta threshold that is used to determine if a touch has
 105       been detected. A higher value means a larger difference in capacitance
 106       is required for a touch to be registered, making the touch sensor less
 107       sensitive.
 108       The number of entries must correspond to the number of channels.
 109
 110   microchip,calib-sensitivity:
 111     $ref: /schemas/types.yaml#/definitions/uint32-array
 112     minItems: 3
 113     maxItems: 8
 114     items:
 115       enum: [1, 2, 4]
 116     description: |
 117       Specifies an array of numeric values that controls the gain
 118       used by the calibration routine to enable sensor inputs
 119       to be more sensitive for proximity detection.
 120       Gain is based on touch pad capacitance range
 121       1 - 5-50pF
 122       2 - 0-25pF
 123       4 - 0-12.5pF
 124       The number of entries must correspond to the number of channels.
 125
 126 patternProperties:
 127   "^led@[0-7]$":
 128     type: object
 129     description: CAP11xx LEDs
 130     $ref: /schemas/leds/common.yaml#
 131
 132     properties:
 133       reg:
 134         enum: [0, 1, 2, 3, 4, 5, 6, 7]
 135
 136       label: true
 137
 138       linux,default-trigger: true
 139
 140       default-state: true
 141
 142     required:
 143       - reg
 144
 145     additionalProperties: false
 146
 147 allOf:
 148   - $ref: input.yaml
 149   - if:
 150       properties:
 151         compatible:
 152           contains:
 153             enum:
 154               - microchip,cap1106
 155               - microchip,cap1203
 156               - microchip,cap1206
 157               - microchip,cap1293
 158               - microchip,cap1298
 159     then:
 160       patternProperties:
 161         "^led@[0-7]$": false
 162
 163   - if:
 164       properties:
 165         compatible:
 166           contains:
 167             enum:
 168               - microchip,cap1106
 169               - microchip,cap1126
 170               - microchip,cap1188
 171               - microchip,cap1203
 172               - microchip,cap1206
 173     then:
 174       properties:
 175         microchip,signal-guard: false
 176         microchip,calib-sensitivity: false
 177
 178 required:
 179   - compatible
 180   - interrupts
 181
 182 additionalProperties: false
 183
 184 examples:
 185   - |
 186     i2c {
 187       #address-cells = <1>;
 188       #size-cells = <0>;
 189
 190       touch@28 {
 191         compatible = "microchip,cap1188";
 192         interrupt-parent = <&gpio1>;
 193         interrupts = <0 0>;
 194         reg = <0x28>;
 195         autorepeat;
 196         microchip,sensor-gain = <2>;
 197         microchip,sensitivity-delta-sense = <16>;
 198         microchip,input-threshold = <21>, <18>, <46>, <46>, <46>, <21>;
 199
 200         linux,keycodes = <103>, /* KEY_UP */
 201                          <106>, /* KEY_RIGHT */
 202                          <108>, /* KEY_DOWN */
 203                          <105>, /* KEY_LEFT */
 204                          <109>, /* KEY_PAGEDOWN */
 205                          <104>; /* KEY_PAGEUP */
 206
 207         #address-cells = <1>;
 208         #size-cells = <0>;
 209
 210         led@0 {
 211                 label = "cap11xx:green:usr0";
 212                 reg = <0>;
 213         };
 214
 215         led@1 {
 216                 label = "cap11xx:green:usr1";
 217                 reg = <1>;
 218         };
 219
 220         led@2 {
 221                 label = "cap11xx:green:alive";
 222                 reg = <2>;
 223                 linux,default-trigger = "heartbeat";
 224         };
 225       };
 226     };