Understanding error codes     Linux error codes Before implementing the read method, let me quickly explain the error codes (shown in Figure 1) which we should be using…

  Understanding read method     In this article, let's understand our driver's read method implementation.   What is read? The user-level process executes a read system call to read…

  Character driver cleanup function implementation     In this article, let's implement the character driver clean-up function. As you know, the clean-up function gets executed whenever you unload the…

  Creating Device files     In a previous couple of articles, we did these two things. Creating a device number and making a character device registration with the VFS…

  File operations structure initialization     In this article, let's discuss the next step is to initialize this file operations variable. This is just a simple structure variable initialization.…

  Implementing file operation methods     In the previous article, we explored character driver file operation methods. In this article, let's implement all those drivers file operation methods. The best…