How to create a device in /dev automatically upon loading of the kernel module for a device driver?

Question

I am attempting to develop Linux device drivers and as my first attempt I am trying to develop a char device driver that has the following file options,

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Answer 1

First you have to use : sudo mknod /dev/devicename c 81 0

It creates device file in /dev but you have to give it read/write permission. to do so,

sudo chmod 777 /dev/devicename

Done !!!