[tkinom]

Another way to learn how the kernel module work is by tracing the kernel code..

    Learn about FTRACE - https://jvns.ca/blog/2017/03/19/getting-started-with-ftrace/

    Use ftrace to trace your favor .ko
       - simple one such as serial port driver. 
       - usb driver
       - usb to serial port driver, 
       - usb camera driver
       - gpu driver (opensource intel/amd)