Stage 08

Device Drivers & Kernel Modules

Write code that runs inside the Linux kernel. Build loadable modules, character drivers, platform drivers, and interface with real hardware peripherals.

All Topics

Topic 01

Kernel Modules

module_init/exit, module parameters, modprobe/insmod/rmmod, symbol exports, module dependencies, and the module lifecycle.

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Topic 02

Character Devices

cdev, file_operations, open/read/write/ioctl, major/minor numbers, udev rules, and device node creation.

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Topic 03

Platform Drivers

platform_driver, Device Tree binding, probe/remove lifecycle, devm_* resource management APIs, and driver matching.

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Topic 04

Interrupts & Timers

request_irq, threaded IRQs, top/bottom halves, workqueues, tasklets, high-resolution timers, and interrupt context rules.

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Topic 05

I2C / SPI / UART

i2c_driver, spi_driver, regmap, tty layer, and writing client drivers for real sensors and peripheral ICs.

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Topic 06

sysfs & procfs

kobjects, device attributes, device_create_file, /proc seq_file interface, and exposing driver state to user space.

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Topic 07

DMA

DMA engine API, coherent vs streaming mappings, scatter-gather lists, and high-throughput peripheral data transfer.

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