# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/input/iqs269a.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Azoteq IQS269A Capacitive Touch Controller
maintainers:
- Jeff LaBundy <jeff@labundy.com>
description: |
The Azoteq IQS269A is an 8-channel capacitive touch controller that features
additional Hall-effect and inductive sensing capabilities.
Link to datasheet: https://www.azoteq.com/
properties:
compatible:
const: azoteq,iqs269a
reg:
maxItems: 1
interrupts:
maxItems: 1
"#address-cells":
const: 1
"#size-cells":
const: 0
azoteq,hall-enable:
type: boolean
description:
Enables Hall-effect sensing on channels 6 and 7. In this case, keycodes
assigned to channel 6 are ignored and keycodes assigned to channel 7 are
interpreted as switch codes. Refer to the datasheet for requirements im-
posed on channels 6 and 7 by Hall-effect sensing.
azoteq,suspend-mode:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 0
description: |
Specifies the power mode during suspend as follows:
0: Automatic (same as normal runtime, i.e. suspend/resume disabled)
1: Low power (all sensing at a reduced reporting rate)
2: Ultra-low power (channel 0 proximity sensing)
3: Halt (no sensing)
azoteq,clk-div:
type: boolean
description: Divides the device's core clock by a factor of 4.
azoteq,ulp-update:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 7
default: 3
description: Specifies the ultra-low-power mode update rate.
azoteq,reseed-offset:
type: boolean
description:
Applies an 8-count offset to all long-term averages upon either ATI or
reseed events.
azoteq,filt-str-lp-lta:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 0
description:
Specifies the long-term average filter strength during low-power mode.
azoteq,filt-str-lp-cnt:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 0
description:
Specifies the raw count filter strength during low-power mode.
azoteq,filt-str-np-lta:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 0
description:
Specifies the long-term average filter strength during normal-power mode.
azoteq,filt-str-np-cnt:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 0
description:
Specifies the raw count filter strength during normal-power mode.
azoteq,rate-np-ms:
minimum: 0
maximum: 255
default: 16
description: Specifies the report rate (in ms) during normal-power mode.
azoteq,rate-lp-ms:
minimum: 0
maximum: 255
default: 160
description: Specifies the report rate (in ms) during low-power mode.
azoteq,rate-ulp-ms:
multipleOf: 16
minimum: 0
maximum: 4080
default: 160
description: Specifies the report rate (in ms) during ultra-low-power mode.
azoteq,timeout-pwr-ms:
multipleOf: 512
minimum: 0
maximum: 130560
default: 2560
description:
Specifies the length of time (in ms) to wait for an event during normal-
power mode before transitioning to low-power mode.
azoteq,timeout-lta-ms:
multipleOf: 512
minimum: 0
maximum: 130560
default: 32768
description:
Specifies the length of time (in ms) to wait before resetting the long-
term average of all channels. Specify the maximum timeout to disable it
altogether.
azoteq,ati-band-disable:
type: boolean
description: Disables the ATI band check.
azoteq,ati-lp-only:
type: boolean
description: Limits automatic ATI to low-power mode.
azoteq,ati-band-tighten:
type: boolean
description: Tightens the ATI band from 1/8 to 1/16 of the desired target.
azoteq,filt-disable:
type: boolean
description: Disables all raw count filtering.
azoteq,gpio3-select:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 7
default: 0
description:
Selects the channel for which the GPIO3 pin represents touch state.
azoteq,dual-direction:
type: boolean
description:
Specifies that long-term averages are to freeze in the presence of either
increasing or decreasing counts, thereby permitting events to be reported
in either direction.
azoteq,tx-freq:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 0
description: |
Specifies the inductive sensing excitation frequency as follows (paren-
thesized numbers represent the frequency if 'azoteq,clk-div' is present):
0: 16 MHz (4 MHz)
1: 8 MHz (2 MHz)
2: 4 MHz (1 MHz)
3: 2 MHz (500 kHz)
azoteq,global-cap-increase:
type: boolean
description: Increases the global capacitance adder from 0.5 pF to 1.5 pF.
azoteq,reseed-select:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 0
description: |
Specifies the event(s) that prompt the device to reseed (i.e. reset the
long-term average) of an associated channel as follows:
0: None
1: Proximity
2: Proximity or touch
3: Proximity, touch or deep touch
azoteq,tracking-enable:
type: boolean
description:
Enables all associated channels to track their respective reference
channels.
azoteq,filt-str-slider:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 1
description: Specifies the slider coordinate filter strength.
patternProperties:
"^channel@[0-7]$":
type: object
description:
Represents a single sensing channel. A channel is active if defined and
inactive otherwise.
properties:
reg:
minimum: 0
maximum: 7
description: Index of the channel.
azoteq,reseed-disable:
type: boolean
description:
Prevents the channel from being reseeded if the long-term average
timeout (defined in 'azoteq,timeout-lta') expires.
azoteq,blocking-enable:
type: boolean
description: Specifies that the channel is a blocking channel.
azoteq,slider0-select:
type: boolean
description: Specifies that the channel participates in slider 0.
azoteq,slider1-select:
type: boolean
description: Specifies that the channel participates in slider 1.
azoteq,rx-enable:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 1
maxItems: 8
items:
minimum: 0
maximum: 7
description:
Specifies the CRX pin(s) associated with the channel. By default, only
the CRX pin corresponding to the channel's index is enabled (e.g. CRX0
for channel 0).
azoteq,tx-enable:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 1
maxItems: 8
items:
minimum: 0
maximum: 7
default: [0, 1, 2, 3, 4, 5, 6, 7]
description: Specifies the TX pin(s) associated with the channel.
azoteq,meas-cap-decrease:
type: boolean
description:
Decreases the internal measurement capacitance from 60 pF to 15 pF.
azoteq,rx-float-inactive:
type: boolean
description: Floats any inactive CRX pins instead of grounding them.
azoteq,local-cap-size:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2]
default: 0
description: |
Specifies the capacitance to be added to the channel as follows:
0: None
1: Global adder (based on 'azoteq,global-cap-increase')
2: Global adder + 0.5 pF
azoteq,invert-enable:
type: boolean
description:
Inverts the polarity of the states reported for proximity, touch and
deep-touch events relative to their respective thresholds.
azoteq,proj-bias:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 2
description: |
Specifies the bias current applied during projected-capacitance
sensing as follows:
0: 2.5 uA
1: 5 uA
2: 10 uA
3: 20 uA
azoteq,sense-mode:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 9, 14, 15]
default: 0
description: |
Specifies the channel's sensing mode as follows:
0: Self capacitance
1: Projected capacitance
9: Self or mutual inductance
14: Hall effect
15: Temperature
azoteq,sense-freq:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 1
description: |
Specifies the channel's sensing frequency as follows (parenthesized
numbers represent the frequency if 'azoteq,clk-div' is present):
0: 4 MHz (1 MHz)
1: 2 MHz (500 kHz)
2: 1 MHz (250 kHz)
3: 500 kHz (125 kHz)
azoteq,static-enable:
type: boolean
description: Enables the static front-end for the channel.
azoteq,ati-mode:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3]
default: 3
description: |
Specifies the channel's ATI mode as follows:
0: Disabled
1: Semi-partial
2: Partial
3: Full
azoteq,ati-base:
$ref: /schemas/types.yaml#/definitions/uint32
enum: [75, 100, 150, 200]
default: 100
description: Specifies the channel's ATI base.
azoteq,ati-target:
$ref: /schemas/types.yaml#/definitions/uint32
multipleOf: 32
minimum: 0
maximum: 2016
default: 512
description: Specifies the channel's ATI target.
azoteq,assoc-select:
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 1
maxItems: 8
items:
minimum: 0
maximum: 7
description:
Specifies the associated channels for which the channel serves as a
reference channel. By default, no channels are selected.
azoteq,assoc-weight:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 255
default: 0
description:
Specifies the channel's impact weight if it acts as an associated
channel (0 = 0% impact, 255 = 200% impact).
patternProperties:
"^event-prox(-alt)?$":
type: object
description:
Represents a proximity event reported by the channel in response to
a decrease in counts. Node names suffixed with '-alt' instead corre-
spond to an increase in counts.
By default, the long-term average tracks an increase in counts such
that only events corresponding to a decrease in counts are reported
(refer to the datasheet for more information).
Specify 'azoteq,dual-direction' to freeze the long-term average when
the counts increase or decrease such that events of either direction
can be reported. Alternatively, specify 'azoteq,invert-enable' to in-
vert the polarity of the states reported by the channel.
Complementary events (e.g. event-touch and event-touch-alt) can both
be present and specify different key or switch codes, but not differ-
ent thresholds or hysteresis (if applicable).
properties:
azoteq,thresh:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 255
default: 10
description: Specifies the threshold for the event.
linux,code:
$ref: /schemas/types.yaml#/definitions/uint32
description: Numeric key or switch code associated with the event.
additionalProperties: false
"^event-touch(-alt)?$":
type: object
description: Represents a touch event reported by the channel.
properties:
azoteq,thresh:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 255
default: 8
description: Specifies the threshold for the event.
azoteq,hyst:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 15
default: 4
description: Specifies the hysteresis for the event.
linux,code:
$ref: /schemas/types.yaml#/definitions/uint32
description: Numeric key or switch code associated with the event.
additionalProperties: false
"^event-deep(-alt)?$":
type: object
description: Represents a deep-touch event reported by the channel.
properties:
azoteq,thresh:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 255
default: 26
description: Specifies the threshold for the event.
azoteq,hyst:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 15
default: 0
description: Specifies the hysteresis for the event.
linux,code:
$ref: /schemas/types.yaml#/definitions/uint32
description: Numeric key or switch code associated with the event.
additionalProperties: false
required:
- reg
additionalProperties: false
required:
- compatible
- reg
- interrupts
- "#address-cells"
- "#size-cells"
additionalProperties: false
examples:
- |
#include <dt-bindings/input/input.h>
#include <dt-bindings/interrupt-controller/irq.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
iqs269a@44 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "azoteq,iqs269a";
reg = <0x44>;
interrupt-parent = <&gpio>;
interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
azoteq,hall-enable;
azoteq,suspend-mode = <2>;
channel@0 {
reg = <0x0>;
event-prox {
linux,code = <KEY_POWER>;
};
};
channel@1 {
reg = <0x1>;
azoteq,slider0-select;
};
channel@2 {
reg = <0x2>;
azoteq,slider0-select;
};
channel@3 {
reg = <0x3>;
azoteq,slider0-select;
};
channel@4 {
reg = <0x4>;
azoteq,slider0-select;
};
channel@5 {
reg = <0x5>;
azoteq,slider0-select;
};
channel@6 {
reg = <0x6>;
azoteq,invert-enable;
azoteq,static-enable;
azoteq,reseed-disable;
azoteq,rx-enable = <0>;
azoteq,sense-freq = <0x0>;
azoteq,sense-mode = <0xE>;
azoteq,ati-mode = <0x0>;
azoteq,ati-base = <200>;
azoteq,ati-target = <320>;
};
channel@7 {
reg = <0x7>;
azoteq,invert-enable;
azoteq,static-enable;
azoteq,reseed-disable;
azoteq,rx-enable = <0>, <6>;
azoteq,sense-freq = <0x0>;
azoteq,sense-mode = <0xE>;
azoteq,ati-mode = <0x3>;
azoteq,ati-base = <200>;
azoteq,ati-target = <320>;
event-touch {
linux,code = <SW_LID>;
};
};
};
};
...
