The first is to write a driver as a Linux kernel module. This is (surprisingly) straightforward but isn’t what I’m going to focus on here. The second method is to use the “i2c-dev” kernel module. This lets you interact with your devices from userspace and is what I’ll be covering here. If you want to write a kernel driver, then there are good sources of information for this lurking.
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In this series of articles I describe how you can write a Linux loadable kernel module (LKM) for an embedded Linux device. This is the second article in the series — please read “Writing a Linux Kernel Module — Part 1: Introduction” before moving on to this article, as it explains how to build, load and unload loadable kernel modules (LKMs).
It's important to note that the standard roles of read and write are reversed in the kernel. Read functions are used for output, whereas write functions are used for input. The reason for that is that read and write refer to the user's point of view --- if a process reads something from the kernel, then the kernel needs to output it, and if a process writes something to the kernel, then the.
The .ko suffix means “kernel object”, hinting at what a module really is — just an ELF object file. In fact, before kernel version 2.6, kernel modules used the .o suffix, just like standard.
The purpose of this page is to give basic material to write Linux kernel modules using FPC. As Linux distributions may differ, most actions on installing packages are described for Debian distribution, on which the author of this article works. However, it may be very simple to translate this for other Linux distributions. Language enhancement. The ultimate goal of these wiki pages is to.
Linux has a build infrastructure called “kbuild” to build in-tree and out-of-tree kernel modules. Here I’ll focus on external or out-of-tree kernel module compilation. Linux “kbuild” infrastructure is fairly complicated, better not to go into that. Here we’ll see how to create a Makefile to compile one or more source files into an external kernel module.
A Linux kernel instance will use VFS for the hierarchy (a tree) of directories and files. A new file system will be added as a VFS subtree using the mount operation. A file system is usually mounted from the environment for which it was built (from a block type device, from network, etc.). In particular, however, the VFS can use a normal file as a virtual block device, so it is possible to.