helo device

Loaded from http://blog.csdn.net/sjwangjinbao/article/details/6077225When writing a bus device driver, it was found that the struct device in the 2.6.33.2 kernel had no members of BUS_ID, and the const char *init_name member was found. However, this member cannot be used directly to set and read the device name.The method for kernel operation is dev_name and Dev_

1, after the system plugged into the USB device, from the console interface has the following prompt:From the console information, you can see the inserted USB device name.As you can see, the plugged-in USB device is sde4.However, if the CRT tool is remotely connected to the past, you can use the following command to view the USB

===============================This article is the original site, welcome to reprint!Reprint please indicate the source: http://www.cnblogs.com/gdt-a20 =============================== The kernel developer will be the bus, device, drive the three are abstracted from the software idea, cleverly established the relationship between the two, make it more visualization. Combined with the knowledge that we have learned before, in general, the relationship b

by Fanxiushu 2016 05-15 reprint or quote this article, please indicate the original author.People who have used VMware should know that VMware virtual machines have such a feature,When a USB device is plugged into the host, the USB device can be accessed in VMware's virtual machine system via setup.and accessing this USB device is just as true as inserting the US

From one point of view, the role of a device driver is to provide a mechanism, not a policy.When writing drivers, the program ape should pay particular attention to the following basic concept: When writing kernel code to access hardware, do not impose any specific policy on the user. Because different users have different needs, the driver should handle the problem of how to make the hardware available. And the problem of how to use hardware is left

Linux Device Driver Article 3: How to Write a simple character device driver ?, Linux Article 3 In the first article on linux Device Drivers: the device drivers briefly introduce character drivers. This article briefly introduces how to write a simple character device driver

Linux Device Driver category, character device driver, how to add cdev to the kernel ?, Driver category cdev 1. Linux Device Driver category By hardware of Managed Devices Character Device Access by byte streams, which can be accessed sequentially or at specified locations Touch screen LCD for serial port terminals Bl

In the Linux device driver first: Introduction to the device driver briefly describes the character driver, this article briefly describes how to write a simple character device driver. This article draws on the source code in the LDD, realizes a hardware device-independent character

Tags: logout flags function device fun argv hrd none lapThe code is as follows#include #include#include#include#include#includeintDemo_major = -;intDemo_minor =0;intDemo_count =1;structCdev Cdev;Static struct class*Demo_class;Static structDevice *Demo_device;intDemo_open (structInode *INODEP,structFile * Filep)//turn on the device{PRINTK ("%s,%d\n", __func__, __line__); return 0;}intDemo_release (structInod

This article was reproduced from: http://blog.csdn.net/ymangu666/article/details/39292651Primary, secondary device numberThe application can access the actual device by reading and writing to the device files in the/dev directory.1) Each device file corresponds to two device

See Dr. Zhao Jiong's "Linux 0.11 source code comment" has been two or three weeks, starting from today, some personal summary and sentiment sub-standard inscribed out, chat for memory for later review.In the/linux/boot/bootsect.s of linux0.11 source code, there is a label definition Root_dev! Root_dev:0x000-same type of floppy as boot.! 0x301-first partition on First drive etcRoot_dev = 0x306Here, Root_dev is the device number of the system-specified

Linux character device-simple character device model Linux character Devices I. Use the character Device Driver 1. Compile/install the driverIn Linux, drivers generally use the program structure of the kernel module for encoding. Therefore, the essence of compiling/installing a driver is to compile/install a kernel module. 2. Character

Device number:1, self-allocation of the initiativeMajor = Register_chrdev (0, "First_drv", first_sdv_fops);//RegisterWhen you register your device with the device number 0, the kernel will voluntarily assign a master device number to return.2. Manual designationFind the main device