linux kernel driver tutorial

, it should always be the same and appropriate data type as other parts of the kernel. As long as the driver uses this "Custom" type of function, but does not comply with the conventions, the compiler will issue a warning, then use the-wall compiler option and be careful to remove all warnings, you can be sure that the code is portable. The main problem with the _ T type is that it is often difficult to sel

Add the hardware abstraction layer (HAL) module on Ubuntu to access the Linux Kernel Driver (Lao Luo study note 3) and ubuntuandroid In the overview and learning plan of the hardware abstraction layer (HAL) of Android, we briefly introduce how to write a driver for the hardware in Android. To put it simply,Hardware dri

receive data messages. For network drivers and unlike character devices and block devices, libraries and cores provide a set of functions related to packet transport, rather than ordinary system calls (Open\write)According to the bus classification, can also be divided into the following three categories: 1, USB device 2, PCI device 3, platform bus equipmentFor example, USB wireless network card: According to the general classification for the network interface, by bus classification: USB devic

Source: Ji yiqin blog Author: Ji yiqin I first came into contact with Linux driver development and bought a "Linux Device Driver". The first thing is to build a development environment !!! There is a hello World column on it: // Hello. c# Include # Include Module_license ("dual BSD/GPL "); Static int hello_init (void

I have read some linux driver materials over the past few days and have a general understanding of its structure and principles. Then I started to practice it. First, re-compile the kernel to build the Linux kernel tree. I am a little white, I searched a lot on the internet,

interfaces, Void * err_ptr (long error);/* encode the error value to the pointer value. error is a common negative error code */ Long is_err (const void * PTR);/* test whether the returned pointer is an error code */ Long ptr_err (const void * PTR);/* extract the actual error code, which is used only when is_err returns a true value. Otherwise, a valid pointer */ 3. Linked List The operating system kernel usually needs to maintain a linked list of d

As a result of the project, the need to compile the kernel, modify the TUN source support sharing mode, compile the kernel encountered the network card driver lost problem, nonsense, said directly to solve the problem, I understand the bottom of the things very shallow, so the way to solve the problem is very clumsy. OS version:centos 5.9

number. The equipment number is divided into two parts, the main equipment number and the minor equipment number. Typically, the main device number identifies the device's corresponding driver, and Linux allows multiple drivers to share a single main device number; The secondary device number is used to determine the device that the device file refers to. In the kern