LDT project is useful for Linux driver development beginners and as starting point for a new drivers. The driver uses following Linux facilities: module, platform driver, file operations (read/write, mmap, ioctl, blocking and nonblocking mode, polling), kfifo, completion, interrupt, tasklet, work, kthread, timer, simple misc device, multiple char devices, Device Model, proc fs, UART 0x3f8, HW loopback, SW loopback, ftracer.
git clone git://github.com/makelinux/ldt.git && cd ldt && ./ldt-test
and explore sources.
Main source file of LDT: ldt.c
Test script, run it: ldt-test
Generic testing utility for Device I/O: dio.c
Browse the rest of source: https://github.com/makelinux/ldt/
3.2.0-30-generic-pae (Ubuntu 12.04 LTS)
2.6.38-11-generic (Ubuntu 11.04)
v2.6.35-rc6 failed because of DEFINE_FIFO