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, this string determines the driver and device matching, and found that two platform devices registered. When the platform driver matches a platform device, it calls once porbe, because it registers two platform devices with the same name, and all probe are called two times. This is the application of two sound card drivers./* Probes a new socdev */static int soc_probe (struct platform_device *pdev) { st
The Linux kernel is highly customizable and can be customized by configuring the compilation options.When configuring the kernel compilation option, there are generally three compiler options for the driver, not compiling, compiling kernel-driven, and compiling to module-driven. So Linux drivers are generally divided into two categories, kernel-driven and module-
structXxx_plat_data *pdata = pdev->dev.platform_data;/*Get Private Data*/4Platform_get_resource (PDEV,XXX,X);/*Get device Resources*/5 ...6 }7 8 Static structPlatform_driver Xxx_platform_driver =9 {Ten. Probe =Xxx_probe, One. remove =__devexit_p (xxx_remove), A. Driver = - { -. Name = Name,/*consistent with platform device name*/ the ... - }, - ... - }; + - Static int__init Xxx_driver_init (void) + { A ... at /*
buzzer is to set the buzzer pin as the input mode, which is used by the gpiolib to achieve. }The buzzer is divided into two kinds, one is active buzzer, the other is passive buzzer. A PWM method must be used for the passive buzzer to make the buzzer sound. The active buzzer can be driven by the PWM method, or it can be sent directly to a high level to make the buzzer sound, but the frequency can not be changed.The code contents of the Pwm_set_freq function are as followsNBSP;TCFG0 is set in Ubo
I have been reading the code. Today I am going to try it. I will take the tiny6410 LED lamp to open the knife. Although I write it myself, it is actually referring to the routine. However, the basic idea is quite clear. Define this drive as MISC device (Miscellaneous Device Driver), including the header file miscdevice. h. In fact, the so-called miscellaneous driver is the device
/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device Driver Development Learning Journey * Topic: device drivers that support polling operations * DAT
0X11000C20Gpx1dat 0X11000C24 led4 3-4 3-5 Gpf3con 0x114001e0Gpf3dat 0x114001e4 Here to note : ARM architecture is IO memory, must be mapped ioremap (); Its role is the mapping of physical memory to virtual memory . Using the Writel readl These two functions, the detailed explanation will not be on the back, look at the simple usage first:Take LED2 as an example, the following is address mapping and reading and writing: int *pgpx2con ; int *pgpx2dat; Pgpx2con = Ioremap (Gpx2con, 4); Pgpx2dat
Tags: parameter usr author the development Linux drive MPI build modDeclare the parameter names, types, and permissions you want to pass in the driver's module.Module_param (name, type, permission) of the variable;The first example#include #includeStatic Char*p_name ="USR"; Module_param (P_name, Charp, S_irugo); Module_parm_desc (P_name,"This is a char * string.");Static int__init Hi_init (void) {PRINTK (Ke
Embedded System Linux kernel Development Practice Guide (ARM platform) book reviews I am deeply touched by the heavy book embedded Linux kernel Development Practice Guide (ARM platform. This
-generic'Shana @ Shana :~ /Linux _ driver development $ Shana @ Shana :~ /Linux _ driver development $ LS-lTotal usage 124-RW-r -- 1 Shana 303 2008-03-16 hello. c-RW-r -- 1 Shana 49039 hello. Ko-RW-r -- 1 Shana 687 hello. Mod. c-
This blog updates the latest developments in the specific interpretation of Linux device-Driven Development (3rd edition). 2015.2.26 nearly finished the first draft.This book has been rebase to the Linux 4.0 kernel in development, with most cases based on multicore cortex-a9
Link: http://hi.baidu.com/igtdqoihjhbacsq/item/9b937ad7c69d4311d78ed091 I have tried hzxing and run it on my 64-bit 10.04 ubuntu. This method works. Thank you, hzxing! The following is the body of the article **************************************** **** Hzxing1010 SpaceLinux driver development environment Configuration This article is based on multiple posts on the Internet, but it is not original. The on
Hongtao, Tiju, Shange, Sunzhizhong, Wu Guoju, Bob Liu, Goo, He Yafeng, Liu Shijie, Hao Yin and other teachers and small partners deeply grateful; To my parents, wife, elder brother and sister, great Mother deeply grateful, the book new version of the writing time more than a year, the process is a huge physical and mental torture, without their silent support and continuous spur, is impossible to complete; With this
1. Preparations First, install the GCC tool chain and the development environment. You can check the previous steps. You have to compile the kernel. Generally, the Development Board has the kernel. Now I do not know how to configure the kernel. You can only compile the kernel according to the default settings of the Development Board. uboot needs to be compiled b
directly, but to get a device number it! Personally feel that the first number more conditioning, more easily detect whether the device number is re-used, the second Linux system in a master device number can correspond to multiple devices of the same type, in view of this, the device must also need a device number, or that sentence we say this useless, Linux drive dev
and sister, great Mother deeply grateful, this book new version of the writing time more than a year, the process is a huge physical and mental torture, without their silent support and continuous spur, is impossible to complete; with this book, To the book to make a great contribution to the editor, planning teachers, especially Zhang Guoqiang teacher deeply gr
Reproduced Original: http://blog.chinaunix.net/uid-12461657-id-3199784.html Linux Driver Development must look Detailed explanation The mysterious kernel is reproduced in http://www.it168.com Source: Chinaunix Author: Chinaunix "IT168 Technical documents " before starting into the mysterious world of Linux device driv
Embedded Linux/android Drive Development Secret (1) Touch screen driver developmentSpecial Introduction: Since 1971, when American Samhurst invented the world's first touch sensor, touch-screen technology has been innovating, giving programmers and UI engineers unlimited space to imagine, which greatly improves the end user's ease of operation for a variety of de
In the previous section, we introduced two methods for driver entry into the kernel: module and direct compilation into the kernel, and introduced the module'sOne way to compile: In an independent folder, use makefile with the kernel source code path. So how to directly compile the driver into the kernel? What is kernel pruning that we often hear about during kernel porting configuration? We often execute t
Embedded Linux Driver Development tutorial (kernel driver, watchdog technology, touch screen, video capture system)Http://www.ibeifeng.com/goods-475.htmlConsulting QQ2110053820Course Lecturer: Mr. HanCourse Category: LinuxSuitable for people: advancedNumber of lessons: 109 hoursUpdate level: CompleteUsing the technolog
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