pci input device driver

/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device driver Development Learning Journey * Topic: blocking and non-blocking I/o * date:2014-11-05 * * Blocking An action is when a device operation is perfo

/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device Driver Development Learning Journey * Theme: Clock * date:2014-11-15 * *First, the kernel timer1. Kernel Timer programmingThe software sense of the timer is ultimately dependent on the ha

value, written; Struct timeval TV; Value = INB (short_base);/* because the parallel port does not have the "interrupt-pending" bit, the ACK bit is used. If this bit is high, the Interrupt Routine is executed. If this bit is low, it indicates that the device is not interrupted, and the Interrupt Routine returns irq_none without subsequent operations. If (! (Value 0x80 )) Return irq_none; Outb (0x70, short_base); // This step clears the interrupt, s

class *cls)C. Character device deletionvoid Cdev_del (struct Cdev *p)D. Release of the equipment number originally requestedvoid Unregister_chrdev_region (dev_t from, unsigned count)After the general operation is over, the driver will also remove the IO mappingvoid Iounmap (*IO_ADDR)5. Defines an action function structure associated with a character devicestatic struct File_operations Firstdrv_ops = {. Own

(structled_classdev*led_cdev,enumled_brightness value) {NBSP;NBSP;NBSP;NBSP;PRINTK (kern_info "whYx210_led_set\n "); structs5pv210_gpio_led*p =to_gpio (led_cdev) //s5pv210_gpio_led pointer back from Led_classdev pointer if (value==led_off) {//user input 0 o'clock kill the user input is echo0>brightness //writel (Readl (Gpj0dat) | (1After the implementation of the general

A blocking operation means that when a device operation fails to obtain the resource, the process suspends until the operation meets the operational conditions. A non-blocking process does not stop when it cannot perform device operations. The suspended process enters the sleep state and is removed from the running queue of the scheduler until the waiting conditions are met. In Linux For the above routines,

/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device Driver Development Learning Journey * Topic: asynchronous I/O * date:2014-11-11 */The most commonly used input/output (I/O) model in Linux is

Chapter 6 advanced character driver operations We have constructed a complete, readable and writable character device driver. Here we will introduce advanced operations. First, you must understand where advanced is? There are several concepts: Sleep, blocking, and non-blocking. In previous driver operations, data can b

Go to Chapter 4 debugging technology of Linux Driver (version 3rd. I. kernel debugging support has been suggested earlier: to learn how to write a driver, you need to build and install your own kernel (Standard main kernel ). One of the most important reasons is that kernel developers have already set up a number of debugging functions. However, as these functions cause additional output and decrease, the r

In fact, it is very easy to set chart indexes in INF. The yellow question mark must indicate that you entered it in this way. Hkr, icon, "-18" Change the PCI device to-5. The value is as follows: Computer 0Display 2Mouse 5Keyboard 6FDC 9HDC 9Ports 10NET 15System 0Sound 8Printer 14Monitor 2Network Transport 3Network client 16Network Service 17 If you still have any questions, you can see the value in your

WDF keyboard filter driver-kbfiltr The kbdfltr sample is an example of a keyboard input filter driver. This sample is WDF version of the original WDM filter driver sample. The WDM version of this sample has been deprecated. This is an upper device filter

First, I want to explain that the reason why I want to study class is that it can automatically create device nodes under/dev. Of course, the class also has another function, and the udev system is also used to automatically create device nodes. udev is in the user space, its automatic creation of device nodes is also dependent on the class provided by the sysfs

with this ktype.Seven, KsetsA kset is just a collection of kobjects that want to relate to each other. There is no special restriction that these kobjects belong to the same ktype, but if not, then be very careful.A kset provides the following features:L It provides a container for a group of kobjectsA kset can be used by the kernel to track all block devices or all PCI device drivers.L A kset is also a su

1. Overview L The device model is a new feature introduced by kernel 2.6. It provides an independent mechanism to specifically represent the device and describe its topological structure in the system, so that the system has the following advantages: N code duplication Minimization N provides a unified mechanism such as reference count N you can list all the devices in the system, observe their statuses, an

);　　　　　　　　　　　　　　　　　　　//Destroy Class Iounmap (Gpfcon); //de-Physical Address mapping PRINTK ("led Module exit\n");} Module_init (Led_init); Module_exit (Led_exit); Module_license ("GPL");Makefile of the module:obj-m:=led.okerneldir:=/home/jz2440/linux-2.6. 22.6 pwd:=$ (Shell PWD)default: -C $ (kerneldir) m=$ (PWD) Modulesclean: -rf *.o *.mod.c *.mod.o *.ko *.symversTest file:#include #include#include#includeintMainintargcChar**argv) { intFD; intval =1; if(ARGC! =3) {printf ("Please

provide new features or to support non-standard hardware. Windows provides many VxD that are not intended to be modified, but that can assist in supporting other VxD. For example, many VxD use the features provided by the V86 memory Manager (V86MMGR) and virtual programmable Interrupt Controller device (VPICD) to save V86 mode memory and allow hardware interrupt requests. To get help with developing a VxD, the Windows 95

(optimization/order/merge)Block device drivers---------------------------------------------Hardware: HDD, FlashAnalysis Ll_rw_blockfor (i = 0; i struct Buffer_head *bh = bhs[i];SUBMIT_BH (rw, BH);struct bio *bio; Using BH to construct the bio (block Input/output)Submit_bio (rw, bio);Common construction requests: using BIO to construct requests (request)Generic_make_request (bio);__generic_make_request (bio

Win7 System Device Manager camera driver display Huang solution share to everyone, Device Manager camera driver display Huang number, installation drive process prompts registry damage, camera is a lot of people chatting and surfing the process of the wonderful use of equipment, the camera

Asynchronous notification for Linux Device Driver Programming The combination of blocking and non-blocking access and poll functions can better solve the reading and writing of devices, but it is more convenient if asynchronous notifications are provided. Asynchronous notification means that once the device is ready, the application is actively notified so that t

Linux Device Driver Programming Timer Author: Source: Linux Responsible editor: Fangzhou Related Topics:Linux device driver development The Linux kernel defines a timer_list structure, which can be used in the driver: Struct timer_list {Struct list_head