logitech linux drivers

1. Get the kernel version When the device driver needs to support different kernel versions at the same time, in the compilation phase, the kernel module needs to know the version of the currently used kernel source code to use the corresponding kernel API. In the 2.4 and 2.6 kernels, the source code header file Linux/version. H is defined as follows: Linux_version_code: the binary representation of the kernel version. Each of the primary, slave, and

Note: a good article on understanding PCI devices and PCI drivers To understand the Linux PCI device driver, first understand that the so-called Linux PCI device driver actually includes the Linux PCI device driver and the device driver. I do not know whether the reader understands this sentence. I think this sentence

Linux provides a set of functions to handle the PCI configuration block. Before a PCI device can be used, the Linux driver needs to determine the specific parameters of the device from the information in the PCI device configuration block, making the relevant settings so that the PCI device can operate correctly.The General PCI device initialization function processing process is:(1) Check whether the kern

　　 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

Distory function*/ int Cleanup_module () { PRINTK ("I'll shut down myself in Kernerl mod/n)"; RETUTN 0; }Such an example is done. We also write a makefile example to fit our application in large program heavy applications. This is the content of the Makfile file. # A Makefile for a module cc=gcc modcflags:=-wall _dmodule-d_kernel_-dlinux HELLO.O Hello.c/usr/inculde? Linux/version.h CC $ (modcflags) 0c hello.c echo the module is Complie completely The

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

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

Compiling of Linux kernel modules and drivers-general Linux technology-Linux programming and kernel information. For details, refer to the following. The Linux kernel is an integral structure, so it is very difficult to add anything to or delete some features to the kernel.

Article reprinted to CSDN community Luo Shenyang's Android tour, original address: http://blog.csdn.net/luoshengyang/article/details/6573809In the Android Hardware Abstraction Layer (HAL) Overview and Learning Plan article, we briefly describe the ways in which Android systems write drivers for hardware. In short, hardware drivers are distributed on the Linux ker

interface for the operating system.★File_operations struct There are many types of drivers, and their programs will be different. How can drivers provide unified interfaces? The most important thing is this struct, which is defined in the include/linux/fs. h file. struct file_operations {struct module *owner;loff_t (*llseek) (struct file *, loff_t, int);ssize_t

Brief introduction The name of the TTY device is abbreviated from the previous telex, originally referred to as a physical or virtual terminal connected to a UNIX system The core of the Linux TTY driver is immediately below the standard character device driver layer and provides a range of functions that are used as interfaces by terminal type devices There are three types of TTY drivers