t430 drivers

, USB audio class device, USB video class device, and mass storage devices can be used to develop general device drivers. You only need to modify the vid and PID.(2) In addition to implementing the stream Driver Interface for a USB device, you also need to implement the three functions: USB installdriver, USB deviceattach, and USB uninstalldriver, And the callback function for pulling out the device. 3. Audio Processing(1) PCM coding method: pulse cod

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

Source:1 Import Urllib.request2 fromBS4 Import BeautifulSoup3 Import OS4 Import IO5 #获取网页6 def get_html (URL):7headers={'user-agent':'mozilla/5.0 (Windows NT 10.0; WOW64) applewebkit/537.36 (khtml, like Gecko) chrome/60.0.3112.101 safari/537.36'}8req = Urllib.request.Request (url=url,headers=headers)9res =Urllib.request.urlopen (req)TenHtml=Res.read () One returnHTML A #获取图片 - def get_img (HTML): -links=[] theSoup=beautifulsoup (HTML,'Html.parser') -Result=soup.find_all ('img') - forIi

once. On Instagram's share, it also mentions a bug that caused a pit daddy.Tenth, Gil.End With Gil, because Gil is a known flaw in Python!Students from other languages may see Python with the threading module, take it to use, the results found that the effect is not right ah, then will spray, what ghost.Summarize:There is no doubt that Python is a very easy-to-learn and very powerful language. Python is very flexible and can be customized very strongly. At the same time, there are traps that ma

One, interrupt handler functionThe interrupt handler function runs in the interrupt context and cannot be preempted or dispatched.There are a few things to note about interrupt context programming:Cannot sleep or call schedule to abandon CPUYou cannot call any function that may sleep, for example: to get the semaphoreThe user spatial data cannot be accessed, for example: Copy_from_user, because it is not executed in the context of the process.Execution time as short as possibleint REQUEST_IRQ (u

1. Linux Power Management Global architectureLinux power management is very complex, involving system-level standby, frequency-voltage transformation, System idle processing, and each device driver support for system standby and runtime power management for each device, which can be say and every device driver in the system.Power management is very important for consumer electronics products. Therefore, this part of the work often occupies a considerable proportion in the development cycle, and

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

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 a pointer to the module that owns the structu

#includeStatic Char*name ="Ocean";Static intCount =2;Static intpara[8] = {1,2,3,4};Static intN_para =1; Module_param (count,int, S_irugo); Module_param (name, Charp, S_irugo); Module_param_array (Para,int, N_para, S_irugo);Static structFile_operations first_drv_fops={. Owner=this_module,. Open=First_drv_open,. Write=First_drv_write,};intFirst_drv_init (void) {PRINTK ("Init first_drv drv!\n"); inti; for(i =0; I ) PRINTK (Kern_alert"(%d) Hello,%s! \ n", I, name); for(i =0; I 8; i++) PRINTK (Kern

The development environment of LDD3 recommended is 2.6.10, installed RHEL4-UPDATE4, its kernel version is 2.6.9.42, compiling the mmap program times wrong: Unknown symbol Remap_pfn_rangeOn the Internet, the above error should be changed to Remap_page_range, and Remap_page_range is no longer recommended, two kernel functions The second parameter definition is not the same: int Remap_page_range (struct vm_area_struct *vma, unsigned long from, unsigned long phys_addr,//

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 Linux

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

when a per-cpu variable is created. Each processor in the system will have a unique copy of the variable does not need to be locked can be saved in a fast cache of the appropriate processor DEFI NE_PER_CPU (type, name); get_cpu_var (variable); put_cpu_var (variable); per_cpu (variable, int cpu_id); void *alloc_percpu (type); void *__alloc_percpu (size_t size, size_t align); per_cpu_ptr (vo

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_device;const char *nodename;mode_t mode;};Misc Device-driven registration and logoff with the

1. Download the official driverHttp://www.geforce.cn/driversIf we install the driver directly, we often get an error: Error:the Nouveau kernel driver is currently on use by your system. This driver was incompatible with the NVIDIA driver. Please go ahead and look down.2. Disable the integrated Nouveau driveUbuntu System integrated Graphics driver is Nouveau, it is the third party developed for Nvidia open source driver, we need to shield it before installing Nvidia official driver.The driver was

));Globalmem_setup_cdev (globalmem_devp[0], 0);Globalmem_setup_cdev (globalmem_devp[1], 1);Zang Chinese New Year HoneywellCreate_cjsys_entry ();Create_cjproc_entry ();return 0;Fail_malloc:Unregister_chrdev_region (Devno, 1);return result;}static void __exit globalmem_exit (void) {Cdev_del (globalmem_devp[0].cdev);Cdev_del (globalmem_devp[1].cdev);Kfree (GLOBALMEM_DEVP);Unregister_chrdev_region (MKDEV (globalmem_major, 0), 2);Class_destroy (Globalmem_class);Remove_proc_entry (Cj_proc_entry, NULL)

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 process needs to be done on a pure command line, so

can be used to initialize or reboot the system. 行的通的安装方法：sudo apt-get install linux-headers-generic build-essential gitgit clone https://github.com/lvmxh/mt7601cd mt7601/srcmakesudo make installsudo mkdir -p /etc/Wireless/RT2870STA/sudo cp RT2870STA.dat /etc/Wireless/RT2870STA/sudo modprobe mt7601UstaYour Wireless should now is working.You are compiled the driver for your, kernel version only. When Update Manager installs a later linux-image, after the required reboot, you must r

The role of device driversThe operation of any computer system is the result of the combination of hardware and software, and the computer system's hardware and software accomplish each other.Application software engineers need to see a pure software world without hardware, and the hardware must be rendered transparently. Drive engineers to realize the invisibility of hardware to software engineers.Device Drivers act as a link between hardware and app

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 interrupt context.----A simple way to use:----if (Dow