install device driver

(Demo_init); Module_exit (Demo_exit); Module_author ("libra13179"); Module_license ("GPL v2");MakefileVERS = $ (Shell uname-R) # Kernel Modulesobj-M + = for the module compilation. #EXTRA_CFLAGS /c3>=-g-o0build:kernel_moduleskernel_modules: -c/lib/modules/$ (kvers)/build m=$ (CURDIR) Modulesclean: -c/lib/modules/$ (kvers)/build m=$ (CURDIR) CleanMake TestUse the DMESG directive to viewUse Cat/proc/devices to see demo informationNow mainly introduces the use of DEMO.C in functions and macr

Linux Device Driver Article 4: Driver debugging methods, linux Article 4 In the previous article, we probably talked about how to write a simple character device driver. We are not a god, but there will certainly be a problem when writing code. We need to continuously debug

table items that the character device test occupies in the system character device table.A simple character device can be written. The file name is test. C. Compile the following code:$ Gcc-O2-dmodule-d1_kernel _-C test. C //-C indicates that the output name is specified and the. o file is automatically generated.The file test. O is a

Linux Device Driver Article 5: concurrency and final state in the driver, linux Article 5Summary In the previous article, I introduced the debugging method of the linux driver. This article describes the concurrency and status encountered in driver programming and how to han

mouse uses the PS/2 interface, but the USB interface also has more and more mouse, the two have their own advantages: Generally, the bandwidth of the USB mouse interface is greater than the PS/2 mouse, that is to say, in the same period of time, the number of USB mouse scans is more than PS/2, so that the USB mouse is more precise in positioning. At the same time, the default sampling rate of USB interface mouse is also relatively high, up to 125Hz, while the PS/2 interface only has 40Hz (Windo

Character device driversAn application is a function called open Read write in a C library. In order to operate the hardware, the driver module is introduced.Build a simple drive that has a few steps.1. Create File_operations2. Request a device number3. Registering character device drivers,4. Drive entry5. Drive exitCh

Citation: We know that every character device has a CDEV structure in the kernel that describes it, and one of the more important members of this structure isConst struct file_operations *ops;The function of this structure is to match the system call in the user program with the specific implementation function one by one in the driver. When invoking a system call to a character

This concept emerged when the new sysfs management device driver was adopted in linux2.6 and can be intuitively understood under the/sys directory. Bus indicates the bus type, such as I2C, IDE, USB... many bus types such as platform, including MTD devices; Device records device resources, specific to the NAND

system. The table items occupied by the character device table. A simple character device can be written. The file name is test. C. Compile the following code $ Gcc-O2-dmodule-d1_kernel _-C test. c The file test. O is a device driver. If the device

=alloc_chrdev_region (char_dev_no,0,1,"chartest"); Char_major=major (CHAR_DEV_NO); } PRINTK (Kern_alert "Hello,,we succeed\n"); if (result return result; Chartest_setup_cdev (); PRINTK (Kern_alert "Hello,,we succeed\n"); return 0; } static void Char_exit (void) { Cdev_del (glob_char_dev.cdev); Unregister_chrdev_region (MKDEV (char_major,0), 1); //zhu XIAO Device_unregister (Char_class_dev); Class_destroy (Char_class); PRINTK (Kern_alert "720 unregister succe

This section lists the system-defined Device InterfaceClassesThat support the following types of devices: 1394 and 61883Devices Battery and ACPIDevices BluetoothDevices Display and ImageDevices Interactive InputDevices ModemDevices NetworkDevices Serial and parallelPort Devices StorageDevices Kernel streamingMedia devices USBDevices Windows portableDevices Windows SideshowDevices The following information is wrongly ded for each

Memdev device driver source code Memdev. h. Custom header file ************************************ **************************************** ** # ifndef _ memdev_h _ # DEFINE _ memdev_h _ # ifndef memdev_major # define memdev_major 254/* default mem primary device Number */# endif # ifndef primary # define limit 2 /* number of devices */# endif # ifndef memdev_si

) Return-efault; / * Perform the appropriate action according to the command * / switch (cmd) { / * Print current device information * / Case Memdev_iocprint: PRINTK (" Break ; / * Get parameters * / Case Memdev_iocgetdata: Ioarg = 1101; ret = __put_user (Ioarg, (int *) arg); Break ; / * Set parameters * / Case Memdev_iocsetdata: ret = __get_user (Ioarg, (int *) arg); PRINTK (" Break ; Default:

1, create a device node in the/sys/class/directory, such as creating a CLASS_TEST_USB device node[CPP]View Plaincopy Static struct CALSS *test_class; Test_class = Class_creat (This_module,"Class_test_usb"); 2, create another device node in the CLASS_TEST_USB directory android0, as follows[CPP]View Plaincopy struct

Linux Device Driver inquiry 1st days ---- spi Driver (1), 1st days ---- spi This document allows reprinting. Please indicate the source:Http://blog.csdn.net/fulinus The Linux kernel code is too big, and a small module will make you feel helpless. This afternoon, I am determined to take a good look at the spi driver. Fi

[Linux Device Driver] linux address type, linux Device address type List of address types used in Linux: User virtual addresses) The normal address visible to the user space program. The virtual address length is 32-bit or 64-bit. It depends on the underlying hardware architecture. Each process has its own virtual address space. Physical address (Physical address

the character device test occupies in the system character device table. A simple character device can be written. The file name is test. c. Compile the following code: $ Gcc-O2-DMODULE-d1_kernel _-c test. c-c indicates that the output name is specified and the. o file is automatically generated. The file test. o is a device