epson linux drivers

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

A simple process for writing drivers in linux-general Linux technology-Linux programming and kernel information. For details, refer to the following section. This is the driver of the keys on the 2410 board. I mark the order of the Code (1, 2, 3...) and the description in the code. Simple Program It's just an entry, an

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

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

　　 Step 2: Create the int init_test (void) function) Register the device here: Result = register_chrdev (254, "test", test_fops ); 　　 (2) set test. copy c to the/uclinux/linux/drivers/char directory, and mem in the/uclinux/linux/drivers/char directory. in c, add the following code to the int c

the device here: Result = register_chrdev (254, "test", test_fops ); 　　 　　 (2) set test. copy c to the/uclinux/linux/drivers/char directory, and mem in the/uclinux/linux/drivers/char directory. in c, add the following code to the int chr_dev_init () function: # Ifdef CONFIG_TESTDRIVE Init_test (); # Endif 　　 (3) add

1.1 In object-oriented programming, the device driver core layer and examples can define a base class for a class of similar things, and specific things can inherit the functions in this base class. If the implementation of a function of the inherited object is the same as that of the base class, it can directly inherit the functions of the base class. On the contrary, it can be overloaded. This object-oriented design method greatly improves the code reusable ability and is a good display of the

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

Linux device driversOne, the role of device-drivenThe most popular explanation for device drivers is " Drive hardware Device Actions ". Drive and the underlying hardware directly to deal with, according to the specific work of the hardware device, read and write device registers, the completion of the device polling (polling (Polling) is a CPU decision how to provide peripheral equipment services, also know

, process management, file management, storage management, equipment management, network and communication management, user interface, in which the processor management is actually process management. Because the processor is allocated and executed in a process-based unit. and storage management means memory management.Further, the computer has a network card, video card, sound card, etc., you can also external USB flash drive, printer and so on peripherals, so many devices have no classificatio