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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/microchip,cap11xx.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Microchip CAP11xx based capacitive touch sensors
description: |
The Microchip CAP1xxx Family of RightTouchTM multiple-channel capacitive
touch controllers and LED drivers. The device communication via I2C only.
maintainers:
- Rob Herring <robh@kernel.org>
properties:
compatible:
enum:
- microchip,cap1106
- microchip,cap1126
- microchip,cap1188
- microchip,cap1203
- microchip,cap1206
- microchip,cap1293
- microchip,cap1298
reg:
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
interrupts:
maxItems: 1
description: |
Property describing the interrupt line the
device's ALERT#/CM_IRQ# pin is connected to.
The device only has one interrupt source.
autorepeat:
description: |
Enables the Linux input system's autorepeat feature on the input device.
linux,keycodes:
minItems: 3
maxItems: 8
description: |
Specifies an array of numeric keycode values to
be used for the channels. If this property is
omitted, KEY_A, KEY_B, etc are used as defaults.
The number of entries must correspond to the number of channels.
microchip,sensor-gain:
$ref: /schemas/types.yaml#/definitions/uint32
default: 1
enum: [1, 2, 4, 8]
description: |
Defines the gain of the sensor circuitry. This
effectively controls the sensitivity, as a
smaller delta capacitance is required to
generate the same delta count values.
microchip,irq-active-high:
type: boolean
description: |
By default the interrupt pin is active low
open drain. This property allows using the active
high push-pull output.
microchip,sensitivity-delta-sense:
$ref: /schemas/types.yaml#/definitions/uint32
default: 32
enum: [1, 2, 4, 8, 16, 32, 64, 128]
description:
Controls the sensitivity multiplier of a touch detection.
Higher value means more sensitive settings.
At the more sensitive settings, touches are detected for a smaller delta
capacitance corresponding to a "lighter" touch.
microchip,signal-guard:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 3
maxItems: 8
items:
enum: [0, 1]
description: |
0 - off
1 - on
The signal guard isolates the signal from virtual grounds.
If enabled then the behavior of the channel is changed to signal guard.
The number of entries must correspond to the number of channels.
microchip,input-threshold:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 3
maxItems: 8
items:
minimum: 0
maximum: 127
description:
Specifies the delta threshold that is used to determine if a touch has
been detected. A higher value means a larger difference in capacitance
is required for a touch to be registered, making the touch sensor less
sensitive.
The number of entries must correspond to the number of channels.
microchip,calib-sensitivity:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 3
maxItems: 8
items:
enum: [1, 2, 4]
description: |
Specifies an array of numeric values that controls the gain
used by the calibration routine to enable sensor inputs
to be more sensitive for proximity detection.
Gain is based on touch pad capacitance range
1 - 5-50pF
2 - 0-25pF
4 - 0-12.5pF
The number of entries must correspond to the number of channels.
patternProperties:
"^led@[0-7]$":
type: object
description: CAP11xx LEDs
$ref: /schemas/leds/common.yaml#
properties:
reg:
enum: [0, 1, 2, 3, 4, 5, 6, 7]
label: true
linux,default-trigger: true
default-state: true
required:
- reg
additionalProperties: false
allOf:
- $ref: input.yaml
- if:
properties:
compatible:
contains:
enum:
- microchip,cap1106
- microchip,cap1203
- microchip,cap1206
- microchip,cap1293
- microchip,cap1298
then:
patternProperties:
"^led@[0-7]$": false
- if:
properties:
compatible:
contains:
enum:
- microchip,cap1106
- microchip,cap1126
- microchip,cap1188
- microchip,cap1203
- microchip,cap1206
then:
properties:
microchip,signal-guard: false
microchip,calib-sensitivity: false
required:
- compatible
- interrupts
additionalProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
touch@28 {
compatible = "microchip,cap1188";
interrupt-parent = <&gpio1>;
interrupts = <0 0>;
reg = <0x28>;
autorepeat;
microchip,sensor-gain = <2>;
microchip,sensitivity-delta-sense = <16>;
microchip,input-threshold = <21>, <18>, <46>, <46>, <46>, <21>;
linux,keycodes = <103>, /* KEY_UP */
<106>, /* KEY_RIGHT */
<108>, /* KEY_DOWN */
<105>, /* KEY_LEFT */
<109>, /* KEY_PAGEDOWN */
<104>; /* KEY_PAGEUP */
#address-cells = <1>;
#size-cells = <0>;
led@0 {
label = "cap11xx:green:usr0";
reg = <0>;
};
led@1 {
label = "cap11xx:green:usr1";
reg = <1>;
};
led@2 {
label = "cap11xx:green:alive";
reg = <2>;
linux,default-trigger = "heartbeat";
};
};
};
|
