reinstall device driver

Advantages and disadvantages of Linux Device Driver dynamic kernel insertion and direct integration into the Kernel Analysis Introduction: The company made a Linux-based Ethernet interface board, which is currently maintained by me, the main CPU of this Board uses PowerPC, run the Linux system and add two external DPRAM modules. DPRAM is written in the form of a character

Seven: I2C Dev node operation now to analyze the above structural diagram of the i2c-dev.c in part. this section provides an adapter operation interface for the user space. this part of the code is actually a module. its initialization function is: module_init (i2c_dev_init); The i2c_dev_init () code is as follows: static int _ init i2c_dev_init (void) {int res; printk (kern_info "I2C/dev entries driver/N"); Res = register_chrdev (i2c_major, "I2C", i

TLV, which is the meaning of Type-lenght-value, the No. 0 element of the array represents the type of data, the 1th element represents the length of the data, the third element and the subsequent element hold the variable's data.Establishment of control devicesThe control device, like the PCM device, belongs to the logical device under the sound card. The applic

In order to learn the driver of character devices, we have to understand some related structures... So, open the kernel through Source Insight... I browsed important driver structures. * User-driver relationship: user space read, write, etc. ---> linux System Call ---> indirectly call the functions in the file_operations structure of the

Article title: Basic Knowledge: Linux Terminal tty device driver. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. In Linux, terminal devices are very important. without terminal devices, the system will not be able to provide feedback to users. Linux contains three types

Document directory Contents Driver Contents Driver I/O port From smth Basic Structure Driver Implementation PCI Loopback SIS 1, 900 Implementation of ISA bus DMA Driver Linux supports three types of hardware: char

The Linux USB Gadget device driver can be used to implement some interesting functions. For example, 1. A storage device in an embedded product or a partition of a storage device, it can be used as a USB flash disk by PC. It can easily complete file interaction. This function is widely used in mobile phones, digital ca

Device driver development manual simplified version, manualsimplifiedDevice driver development manual simplified version Author: Eliot shaoBlog URL: blog.csdn.net/eliot_shaoDate: 2015.03.26Description: linux device driver model is regular, Stand in the angle of the

Reprint Please specify source: http://blog.csdn.net/ruoyunliufeng/article/details/45054183Linux drivers are divided into character devices, block device drivers, network drivers, three, which is the most simple character driven. Speaking to write drive naturally think of writing from the character device driver. Look at the Development Board of the official

20150226 IMX257 Bus device driver Model programming bus Chapter (II)2015-02-26 Li Hai alongBefore we explained a simple bus driver, the purpose is to create a file under/sys/bus/, but this is not enough, because the bus is also a device, if you want to let the system know, you must register with Device_register.Here, w

The following is a simple drive implementation of the mpu6050, mpu6050 is the I²c interface of the 6-axis sensor, can be registered as a character device to the kernel, the code is running the environment is the 3.4.2 kernel, 4.3.2 version of the compilation chain, 12.04 version of Ubuntu, the hardware environment is the jz2440 Development Board;According to the previous analysis of the I²c drive frame, the mpu6050 drive is mainly to achieve the perip

difference is that you can re-enter the restrictions are different, some can be unrestricted re-entry, some only allow the operation of heterogeneous operations, and some are not allowed to re-enter the operation, some can be used in the sleep code, and some can not be used in the sleep code. In consideration of the use of different locking mechanisms, but also to consider the efficiency of CPU processing, for different code lengths, different code execution time, choose a good lock on the good

is that you can re-enter the restrictions are different, some can be unrestricted re-entry, some only allow the operation of heterogeneous operations, and some are not allowed to re-enter the operation, some can be used in the sleep code, and some can not be used in the sleep code. In consideration of the use of different locking mechanisms, but also to consider the efficiency of CPU processing, for different code lengths, different code execution time, choose a good lock on the good use of the

multiple devices, it is possible that a port or address is reused, and unprotected direct access is an error. The operating system provides such a set of protection mechanisms that the requested IO port/address is not allowed to be applied again (Request_region is used to request IO port number, request_mem_region for IO address).1.I/O Mapping Method (case:/DRIVER/CHAR/PC8736X_GPIO.C)void Request_region (unsigned long from, unsigned long num, const c

after the computer connected to the printer, prompted "Failed to install device driver", do not know what causes, and do not know how to solve. In fact, this situation is because the Win7 system with the drive, Win7 Drive source does not have this printer driver, only need to download again. Next, let's look at the specific solution. 　　Method/Step

I recently learned the operating mechanism of the device model and trained on books and online materials. my appearance amp; 20284; has changed my network permission. I recently learned the operating mechanism of the device model and trained books and online materials. it seems that I have modified my network weight. so I wrote down and sorted out my ideas. Since the hardware information and logical operat

Storage Multipath Subsystem Device Driver Installation configuration and instructions The storage multi-path software used by a Coal Company's ERP system is datapath currently has two shared vg. A total of 1453Gb data. The IBM System Storage Multipath Subsystem Device

(ndevices *sizeof(structSbull_dev), Gfp_kernel);/ * Allocate space for block core data structure Sbull_dev * / if(Devices = = NULL)GotoOut_unregister; PRINTK (kern_warning"Sbull:start setup_device\n"); Sbull_setup_device (Devices);/ * Initialize the SBULL_DEV core data structure and add_disk*/ return0; Out_unregister:unregister_blkdev (Sbull_major,"Sbull");return-enomem; }Static voidSbull_exit (void) {structSbull_dev *dev = Devices; Del_timer_sync (dev->timer);if(DEV-GT;GD) {Del_gendisk (DEV-GT

[Disclaimer: All Rights Reserved. You are welcome to reprint it. Do not use it for commercial purposes. Contact Email: feixiaoxing @ 163.com] Yesterday we talked about some simple module compiling methods, but it did not involve the compilation of devices. Today we can learn about the relevant content, an instance is used to describe how devices are written on Linux. Although I am not dedicated to Linux drivers, I often receive emails from friends. In the letter, many drivers are not very satis

Let's see Program In line 2, here is a judgment Statement, which is used to determine whether the inserted device is of the usbmsc_interface_class type. This constant is in usbmsc. the H file defines that if the device is not a USB storage device, the function is terminated, that is, the driver can only process USB sto