Module hotplug 

Device Hotplug Detection Module

This module provides udev-based monitoring for input device hotplug events. It detects when devices are added or removed from the system and streams events to the main daemon loop via mpsc channels.

Architecture

• DeviceMonitor: Spawns a blocking udev monitor task and provides an async receiver
• DeviceEvent: Enum representing device add/remove events with device identification
• Uses udev::MonitorBuilder with subsystem filtering for input devices only
• Blocking udev socket iteration runs in spawn_blocking to avoid blocking async runtime

Device ID Format

Device IDs use the “vendor:product” hexadecimal format (e.g., “1532:0220”) matching the YAML configuration format and DeviceManager::format_device_id().

Structs

DeviceMonitor

Device hotplug monitor

Enums

DeviceEvent

Device hotplug event

Functions

format_device_id

Format a device identifier from vendor and product IDs

handle_device_add

Handle device addition - restore LED state if available

handle_device_remove

Handle device removal - preserve LED state in memory