How to communicate with a Linux kernel module from user space without littering /dev with new nodes?

Question

What are the ways to communicate with a kernel module from user space? By communication i mean sending information and commands between the kernel module and a user space pr

Answer 1

There's also the /sys filesystem (sysfs):

Sysfs exports information about devices and drivers from the kernel device model to userspace, and is also used for configuration.

(from Wikipedia)