synaptics pointing device driver

Linux has always been known for its strong network capabilities, while equipment ' > network equipment is also one of the three major devices that are essential for Linux-driven learning, and because of historical reasons, Linux does not enforce its "all documents" concept for Devices ' > network devices. , the device ' > network device does not use the device fi

process of applying open () to call a system call function at the upper level For a character device file, its Inode->i_cdev points to the character-driven object Cdev, and if I_cdev is NULL, the device file is not opened. Because multiple devices can share the same driver. Therefore, the list of i_devices and Cdev in the inode of the character

It indicates that any short read that may occur on an in endpoint should be treated as an error by the USB core. this value is only useful for reading urb from a USB device, not for writing URBS. Urb_iso_asapIf this urb is synchronized, this bit can be set. If the driver wants this urb to be scheduled, as long as the bandwidth permits it, and set the start_frame variable in this urb. if the synchronized urb

, Device_class_mask) Module_device_table Module_device_table (PCI, i810_ids); Create a local variable named __mod_pci_device_table, pointing to the struct pci_device_id array During the kernel build process, the DEPMOD program searches for symbols in all modules __mod_pci_device_table If the symbol is found, it extracts the data from the module and adds it to the file/lib/module

the return value of the open function. B) int scull_open (struct inode * inode, struct file * filp) in the scull driver) Struct scull_dev * dev; Dev = container_of (inode-> I _cdev, struct scull_dev, cdev );Filp-> private_data = dev;/* for other methods */ In the scull driver, write and read data through filp-> private_data (pointing to dev. When reading

Document directory Contents Driver Contents Driver I/O port From smth Basic Structure Driver Implementation PCI Loopback SIS 1, 900 Implementation of ISA bus DMA Driver Linux supports three types of hardware: char

. 3rdThe actual characteristics of the parameters depend on the specific control commands issued (the 2nd parameter). Some commands do not use a number of parameters, some with a wholeValues, as well as some pointers that use pointing to other data. Using a pointer is a method of passing arbitrary data to the IOCTL call; The device can then be exchanged with the user space regardless of the amount of data.T

numbers (Major: minor) of the device by character to the real device (/sys/devices. /Sys/BusThe directory structure of the kernel device is layered by bus type. All devices in devices are connected to a certain bus. The Symbolic Links of each specific device can be found under each specific bus. /Sys/classThis is a

Let's start with a well-written kernel driver module to experience the following character device driversYou can temporarily ignore the following code implementation!Memdev.c#include 1. Compile/install drivers: in Linux systems, drivers are usually encoded using the kernel module's program structure, so compiling and installing a driver is essentially compiling/i

a very small stack, which may be just like a 4096-byte size page.7. Module-Related:Make compilation moduleInsmod Loading ModuleRmmod removing modulesDMESG display of PRINTK printed data8. Two Make tutorials:1). http://blog.csdn.net/haoel/article/details/28862). http://www.gnu.org/software/make/manual/make.html9.Linux Device Driver Third Edition instance:https://github.com/alants56/ldd3-examples-3.x10. Some