Provides a command-line interface for reading and writing hardware registers via the nl80211 testmode interface. The register definitions are contained in a header file, making it easy to adapt to different hardware by modifying the register map. The implementation is self-contained and demonstrates a clean separation between the register map and the access mechanism.

The driver is split into multiple independent kernel modules (tx_intf, rx_intf, openofdm_tx, openofdm_rx, xpu, side_ch) each with well-defined APIs. Each module exposes configurable parameters and statistics via sysfs using standard Linux driver patterns. This modularity allows for independent development, testing, and reloading of driver components without rebooting the system.

Implements a nl80211 testmode command handler that allows user-space tools to send custom commands to the driver for hardware configuration and experimentation (e.g., setting test modes, reading/writing registers, controlling RF parameters). This pattern provides a safe and standardized way to expose hardware-specific controls to user-space without requiring custom ioctls, making it reusable for other wireless drivers that need to support experimentation.