linux-kernel-pro

Device drivers for I2C and SPI use platform driver patterns with probe/remove callbacks, devm_* resource management for automatic cleanup, and device-tree integration for hardware configuration. Register your driver with i2c_driver or spi_driver structures and handle interrupt setup and DMA operations following kernel coding standards.

Use devm_* allocation functions to ensure proper resource cleanup, validate all inputs rigorously, and follow strict return-value checking. For DMA operations, use appropriate APIs for memory mapping and cache coherency, avoid sleeping in atomic context, and structure error handling with goto-based cleanup paths.

Kernel debugging employs logging, tracing utilities, and performance analysis tools to diagnose module behavior and IRQ problems. Comprehensive return-value checking, proper input validation, and adherence to kernel coding style (8-char tabs, 80-char lines) help identify issues early.

Yes, USB drivers follow platform driver templates with probe/remove callbacks and devm_* resource management. USB drivers integrate with device-tree configurations, handle interrupt routing, support DMA operations, and must comply with kernel subsystem APIs and modern coding conventions.

Kernel module development prohibits sleeping in atomic context, requires static functions where possible, mandates goto-based error handling with complete cleanup, and enforces strict adherence to kernel coding style. All resource allocation must use devm_* functions and validate inputs rigorously.

Platform drivers bind to device-tree nodes through compatible properties, extract hardware configuration and memory-mapped register addresses from device-tree data, and initialize interrupt and DMA setup accordingly. Use devm_* functions to manage resources tied to device lifecycle.