In this article we develop a simple Linux character driver for Turning on LED connected to Raspberry-Pi GPIO, and also read the message from driver to userspace applications. Device class is created as follows: struct class cl classcreate (THISMODULE, '') and then the device info ( ) under this class is populated by: devicecreate (cl, NULL, first, NULL, '', ) where first is the devt with the corresponding .
In Linux, the character devices are used for transferring a small amount of data from user space application to Hardware device, similarly, this interface is also used to receive data from Hardware device to userspace application.
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