This is a GPLv2+ sample implementation of a character device driver for Linux 2.6 and later, based on udev.

For more background information as well as a detailed source walkthrough, see the following blog post.

• gcc
• A recent Linux kernel (with its source)

• Just invoke make as root

• insmod parrot_driver.ko debug=1
• lsmod | grep parrot
• echo "Yabba Dabba Doo" > /sys/devices/virtual/parrot/parrot_device/fifo
• cat /dev/parrot_device

On a Debian system, and if you haven't recompiled a kernel before, you may have to issue the following before you can compile and run the driver:

cd /usr/src
apt-get install linux-headers
uname -r	# Get the version of your kernel, e.g. '3.16.0-4-amd64'
apt-get install linux-source-3.16	# Use the same major.minor as above
tar -xJvf linux-source-3.16.tar.xz
ln -s linux-source-3.16 linux
cd /usr/src/linux
cp /usr/src/linux-headers-$(uname -r)/Module.symvers .
make oldconfig && make prepare && make scripts