logitech linux drivers

, unsigned short type, void *daddr, void *saddr, unsigned len);The function establishes a hardware header based on the source and destination hardware addresses that were previously retrieved. The function task is to organize the information that is passed as a parameter into the appropriate hardware header that is unique to the device.Eth_headeris the default function of the Ethernet type interface,E

macro, the type of the return value is as follows: _ioc_none : No properties _ioc_read : Readable properties _ioc_write : Writable Property _ioc_read | _ioc_write: Readable, writable property When you use this command, the ARG variable value of the application's IOCTL () specifies the cache (struct) address when the data is read on the device driver._iow MacroUsed to create a command to write data on the device, the remainder is the same as _ior. Typically, w

)When you run the macro, the type of the return value is as follows: _ioc_none: No attribute _ioc_read: Readable properties _ioc_write: Writable Properties _ioc_read | _ioc_write: Readable, writable property When you use this command, the ARG variable value of the application's IOCTL () specifies the cache (struct) address when the data is read on the device driver._IOW macroUsed to create a command to write data on the device, the remainder is the same as _ior. Typical

buffers help to separate the delivery and reception of data from the system call write and read, thereby improving the overall performance of the system A good buffering mechanism requires interrupt-driven I/O To properly interrupt-driven data transfer, the hardware should be able to generate interrupts according to the following semantics For input, the device interrupts the processor when new data has arrived and the processor is ready to receive it For outp

Debug one of exynos4412-ARM embedded Linux-LEDS/GPIO drivers, exynos4412leds /****************************************** ***************************************@ Author's brother * @ version V1.0.0 * @ date 2016-02-19 **************************** **************************************** * ********** 1-led hardware Principle The Led circuit is relatively simple. Generally, a control circuit is built using a

Preface Linux is a variant of the UNIX operating system, and the principle and idea of writing a driver in Linux is similar to that of other Unix systems, but it is very different for drivers in DOS or window environments. Design the driver in the Linux environment, the thought is concise, the operation is convenient,

ARM processor.4. Start GDBPath= $PATH:/opt/arm-linux-gcc/s3c2440_4. 4.3/~/buildspacce/linux-2.6. + . 2_debugarm-none-linux-gnueabi-gdb./vmlinux-d.The kernel stops in hibernation when the OPENOCD is connected in gdb.(GDB) Target remote:3333Remote debugging using:3333s3c24xx_default_idle () at Arch/arm/mach-s3c2410/include/mach/system.h : 0(i++) {5. The ke

, void *addr)int test_bit (nr, void * addr);int test_and_set_bit (nr, void *addr);int test_and_clear_bit (nr, void *addr);int test_and_change_bit (nr,void *addr);Spin lockprimarily for SMP and kernel preemption scenariossingle CPU and kernel can be preempted, preemption will be banned during spin lock holdYou cannot call Copy_to_user () Copy_from_user Kmalloc () and other functions that may cause blocking during a spin lock callspinlock_t spin;Spin_lock_init (lock);Spin_lock (lock);Spin_try_lock

No_llseek Access control for device files Exclusive equipment The most blunt method of access control is to allow only one process to open the device at a time Restrict access by only one user at a time Requires two data items An open count UID of the device owner Current->uid Current->euid Block Open alternative to Ebusy This is usually the

*/Unregister_chrdev_region (MKDEV (mem_major, 0), 2); /* Release the device number */}Module_author ("David Xie");Module_license ("GPL");Module_init (Memdev_init);Module_exit (Memdev_exit);(3) app-ioctl.c(application)#include #include #include #include #include "memdev.h"/* contains the command definition */int main (){int fd = 0;int cmd;int arg = 0;Char buf[4096]; /* Open the device file */FD = open ("/dev/memdev0", O_RDWR);if (FD {printf ("Open Dev Mem0 error!\n");return-1;} /* Invo

blocking and non-blocking IO in Linux device drivers:Blocking and non-blocking in 1.Linux device drivers Summary: http://m.blog.csdn.net/blog/dongteen/17264501Blocking and non-blocking io:http://m.blog.csdn.net/blog/dongteen/17264501 in 2.Linux device driversBlocking and non-blocking I/O in 3.

Tags: important contex ICA mod options map kernel variable EALLinux network devices are different from character devices and block devices, and no files correspond to network devices. The application operates the network device through the socket.The network device driver belongs to the data link layer, communicates with the IP/ARP protocol, and directly operates the physical layer chip (NIC Chip). The three-layer protocol sends data through DEV_QUEUE_XMIT (), receives data through NETIF_RX (),

Linux Kernel '/drivers/media/media-device.c' Local Information Leakage Vulnerability Release date:Updated on: Affected Systems:Linux kernel 2.6.38-3.15-rc2Description:--------------------------------------------------------------------------------Bugtraq id: 68048CVE (CAN) ID: CVE-2014-1739Linux Kernel is the Kernel of the Linux operating system.Linux kernel 2.6.

Chapter 1 2: An Introduction to device driver building and running modules 1. Concurrent, security -- module writting notes 2. Kernel stack is small, normally one page (4 K). So don't create a lot of local variables and don't have a long call stack. 3. kernel can't handle float pointing computing. 4. Compiling Build: OBJ-M: = module. o Module-objs: = file1.o file2.o Make-C ~ /Kernel-2.6 m = 'pwd' modules 5./proc/modules saves all modules load. lsmod uses this file as well. Entries in/proc/mod

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Release date: 2010-09-09Updated on: 2010-09-30 Affected Systems:Linux kernel 2.6.xUnaffected system:Linux kernel 2.6.36-rc4Description:--------------------------------------------------------------------------------Bugtraq id: 43098Cve id: CVE-2010-3084 Linux Kernel is the Kernel used by the Linux operating system. The niu_get_ethtool_tcam_all () function in the driv