How do you write a device driver?

A device driver is a kernel module that is responsible for managing the low-level I/O operations of a hardware device. Device drivers are written with standard interfaces that the kernel can call to interface with a device.

What is the device driver in Linux?

The software that handles or manages a hardware controller is known as a device driver. The Linux kernel device drivers are, essentially, a shared library of privileged, memory resident, low level hardware handling routines. It is Linux’s device drivers that handle the peculiarities of the devices they are managing.