razer drivers linux

When writing drivers, it is generally necessary to add node information to the device tree, which provides a way to add device information directly to the drive.The drive template for I²c is as follows#include The SPI driver template is as follows#include The SPI and IIC drivers under Linux are not programmed to add device information on the device tree

encounter is part-time, and take her to the non-inflow of the guest house,It is advisable to first falsify the name, birthday and occupation information,So that JJ rounds can be disguised as lovers.Similarly, if the actual physical block device driver is to be implemented,It is probably not so random to return the physical structure of the device.For block device drivers, we now need to focus on the struct block_device_operations simp_blkdev_fops str

http://blog.csdn.net/yuesichiu/article/details/8286469The interruption of the device interrupts the normal scheduling and operation of processes in the kernel, and the system's quest for higher throughput is bound to require that the interrupt service program be as concise as possible. However, this good desire often does not coincide with reality.in most real systems, when interrupts arrive, the work to be done is often not short, and it may take a lot of time to process. to find a balance b

Misc Device driver. Also known as hybrid device driver.Misc Device driver shares a device driver number misc_major. It is defined in Include\linux\major.h: #define MISC_MAJOR the structure of the miscdevice is as follows, itDefined in Include\linux\miscdevice.h:struct Miscdevice {int minor;const char *name;const struct File_operations *fops;struct List_head list;struct device *parent;struct device *this_dev

1, the concept and role of asynchronous notification Impact: Blocking-The application does not need to poll the device for access Non-blocking--notification of interrupts That is, initiated by the driver, actively notifies the application 2. Linux Asynchronous Notification programming 2.1 Linux Signal Role: In Linux systems, asynchronous notifications use signals

In addition to the ability to read and write devices, most drivers also need the ability to control hardware. 1. In user space, useIOCTL system calls to control devicesThe prototype is as follows: Int IOCTL (int fd, unsigned long cmd ,...); /* FD: file descriptor cmd: Control Command...: optional parameter: insert * argp. The specific content depends on CMD */ The user program only uses the command code to tell the driver what it wants to do.How to e

The method structure of the device file registration in the Linxu driver is also the body that provides the operation interface to the user layer, my version is 3.1.10Writing is not easy, reprint need to indicate the source: http://blog.csdn.net/jscese/article/details/43408625The prototype is defined in the kernel source/include/linux/fs.h:struct File_operations {struct module *owner; The first file_operations member is not an operation at all; It is

How to pass parameters to a module, Linux kernel provides a simple framework.1. Module_param (name, type, perm);Name is both the parameter name that the user sees and the variable that accepts the parameter within the module;Type represents the data type of the parameter, which is one of the following: Byte, short, ushort, int, uint, long, ulong, CHARP, BOOL, invbool;PERM Specifies the access rights for the corresponding file in the SYSFS. Access righ

Environment: [Linux][ubuntu][14.04.3lts]1. NVIDIA official website Download Graphics driver (is a. Run file)2. It seems that Ubuntu installs nouveau as a driver by default, so turn off nouveau and turn it off in the following way:Create a new/etc/modprobe.d/disable-nouveau.conf (in fact the name is random, because all the. conf files under this directory will load on boot)Additional blacklist nouveau options nouveau modeset=03. The installation proces

critical section cannot be too long; spin----lock can be used in an interrupt contextSignal Volume----need a header file linux/semaphore.h----struct semaphore sem; Define the semaphore----Sema_init (sem,1); Initialize the semaphore----Down_interruptible (SEM); Get the semaphore----......//Critical area code----Up (SEM); Release semaphore----Description: The semaphore differs from the spin lock, which is a sleep lock that cannot be used in an interrup

Memdev.h#ifndef _memdev_h#define _memdev_h#define mem_magic ' m ' #define Mem_restart _io (mem_magic, 0)//Use the kernel-provided macros to generate commands #define MEM _set _iow (mem_magic, 1, int)//change command to pass a shaping parameter to the kernel #endifDriver MEMDEV.C#include Application MEM_READ.C#include The device number is dynamically assigned in the driver and the device number assigned by the system to Memdev is viewed through cat/proc/devices.Use the command Mknod/dev/memde

Linux driver-LED Drivers _ 1, linuxled_1 Steps: 1. Framework 2. complete hardware operations: A. view the principle diagram and pins B. Check the 2440 manual. C. write code: ioremap is required for the IO port. My board sub-circuit is as follows: 1,Configure GPBCON registersConfiguration output is configured in the open function. 2,Configure GPBDAT registersConfigure in the write function #################

Clock management for linux Device Drivers (4) ---- it turns out to be a child When I was a child, I saw a TV series called "Little Dragon man". You don't have to mention it. It's actually very inspirational. To find my mother, it's a great TV series, what are the children watching? Xuanyuan sword, god of every day, magic, illusion, and flashy stuff. Apart from commercial value, what kind of stuff can be use

# If kernelrelease is defined, we 've been invoked from# Kernel build system and can use its language.Ifneq ($ (kernelrelease ),)OBJ-M: = Hello. o # Otherwise we were called directly from the command# Line; invoke the kernel build system. ElseKerneldir? =/Lib/modules/$ (shell uname-R)/buildPWD: = $ (shell PWD)Default:$ (Make)-C $ (kerneldir) M = $ (PWD) ModulesEndif When we knocked on make, we entered this authoritative makefile twice. The first time she entered makefile and found that ker

1. Module_i2c_driver (adxl34x_driver) expand toStatic int__intAdxl34x_driver_init (void){returnI2c_register_driver ( adxl34x_driver);} Module_init (adxl34x_driver_init);Static void__exitAdxl34x_driver_exit (void){returnI2c_del_driver ( adxl34x_driver);} Module_exit (adxl34x_driver_exit);Function: Instead of registering initialization functions and module_init () and Module_exit (), you can replace them with this if you do nothing in the initialization function. Common macros in

previous blog post, assuming that the interrupt action occurred, the mask value will be told to the kernel. The meaning of the value of mask: Constant Description Pollin Normal or priority with data-readable Pollrdnorm Plain Data readable Pollrdband Priority with data-readable Pollpri High-priority data readable Pollout Plain data can be written Pollwrnorm

function returns, any work function that was committed before the call does not run anywhere on the system.After you have finished using the work queue, you can call the following function to release the related resources:void Destroy_workqueue (struct work_queue_struct *queue);Shared queuesThe device driver can use the shared default work queue provided by the kernel.Initializing the WORK_STRUCT structurestatic struct work_struct jiq_work;Init_work (jiq_work, Jiq_print_wq, jiq_data);int schedu