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Linux Driver Tutorial

Here you can find examples for simple Linux Kernel Modules and Linux Drivers.

Preparation

I used a Raspberry Pi 3 to develop and test my modules and drivers. To compile them, you need to install the Kernel headers on your Pi. On Raspbian you can do this with the following command:

sudo apt update
sudo apt install raspberrypi-kernel-headers

Raspberry Pi OS is only installs the latest kernel headers. So, make sure, you are running the latest kernel. You can do this by running:

sudo apt upgrade

You also need the build utils (make, gcc, ...) but they come preinstalled on Raspbian.

Content

In this repo you can find examples for:

  1. Simple Kernel Module
  2. Device Numbers and Device Files
  3. Create device file in driver and callbacks
  4. GPIO Driver
  5. Text LCD Driver
  6. PWM Module
  7. Temperature Sensor (I2C)
  8. Timer in Linux Kernel Modules
  9. High Resolution Timer in Linux Kernel Modules
  10. Accessing SPI with a Linux Kernel Module (BMP280 sensor again)
  11. Using a GPIO Interrupt in a Linux Kernel Module
  12. Using Parameters in a Linux Kernel Module
  13. IOCTL in a Linux Kernel Module
  14. Threads in a Linux Kernel Module
  15. Sending a signal from a Linux Kernel Module to an userspace application
  16. The poll callback
  17. Waitqueues in a Linux Kernel Module
  18. Create procfs entries from a Linux Kernel Module
  19. Create sysfs entries from a Linux Kernel Module
  20. Parse the device tree from a Linux Kernel Module to get the deivce properties of a specific device
  21. Device Tree GPIO Driver
  22. Device Tree Driver for I2C Device
  23. Dynamical memory management in a Linux Kernel module
  24. Serial (UART) Driver
  25. Industrial IO compatible driver for an ATMEGA I2C ADC
  26. Device Tree SPI Driver (IIO compatible driver for Atmega SPI ADC)
  27. Misc Device
  28. Mutex for exclusive access to shared resource
  29. Completions for synchronisation
  30. Direct Memory Access (DMA) memcopy example
  31. Accessing files form a Linux Driver
  32. The mmap callback
  33. Linked Lists
  34. Registering device numbers, read and write callback in character devices Take 2
  35. Private Data in struct file
  36. I2C Device Driver without Device Tree
  37. Sysfs Class
  38. Kernel Log levels

More Information

For more information about my Linux Driver examples check out my videos and my playlist

Support me

If you want to support me, you can buy me a coffee buymeacoffee.com/johannes4linux.