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feat: Add LED indicator support (#3239)

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This adds a new zmk,indicator-leds device, which maps HID indicator
states onto any devices that implement the LED driver API. This adds
support for things like a caps lock LED.

The name was chosen so that more drivers could be added later as
zmk,indicator-*, for example a version that uses the LED strip API.
This commit is contained in:
Joel Spadin 2026-03-23 01:35:35 -05:00 • committed by GitHub
parent a1aca03aa0
commit 197f899777
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18
app/include/dt-bindings/zmk/hid_indicators.h Normal file
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/*
* Copyright (c) 2026 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#pragma once
#include <dt-bindings/zmk/hid_usage.h>
// hid.h defines HID_USAGE_LED_NUM_LOCK as the minimum value, so that is bit
// zero in the report, and all other indicators are relative to that.
#define HID_INDICATOR_NUM_LOCK (1 << (HID_USAGE_LED_NUM_LOCK - HID_USAGE_LED_NUM_LOCK))
#define HID_INDICATOR_CAPS_LOCK (1 << (HID_USAGE_LED_CAPS_LOCK - HID_USAGE_LED_NUM_LOCK))
#define HID_INDICATOR_SCROLL_LOCK (1 << (HID_USAGE_LED_SCROLL_LOCK - HID_USAGE_LED_NUM_LOCK))
#define HID_INDICATOR_COMPOSE (1 << (HID_USAGE_LED_COMPOSE - HID_USAGE_LED_NUM_LOCK))
#define HID_INDICATOR_KANA (1 << (HID_USAGE_LED_KANA - HID_USAGE_LED_NUM_LOCK))