install device driver

devices. For example, the virtual Printer Driver provides the printer interface to the operating system, printing can still be performed without a printer. The Linux kernel module is Kernel modules can be used to expand kernel functions. kernel modules are usually used for device drivers and file systems. If you do not have a kernel module, you need to add features to the kernel to modify the code, rec

1. device. The device structure is used to describe the device in LDM. Struct device {/* parent device, usually a bus or host device */struct device * parent;/* Private Data Pointer: S

I. What is IOCTL?IOCTL is a function used by the device driver to manage the device's I/O channels. The management of the I/O channel is to control some features of the device, such as the Serial Transmission baud rate and the motor speed. The number of calls is as follows: Int IOCTL (int fd, IND cmd ,...); FD is the File Identifier returned by the open function

Preface Device tree is a data structure used to describe hardware, similar to a plate-level description language, originating from OpenFirmware (of). In the current widely used Linux kernel 2.6.x version, for different platforms, different hardware, there is often a large number of different, poor portability of the board level Description code to achieve these different platforms and different hardware special adaptation needs. But the plethora of p

From one point of view, the role of a device driver is to provide a mechanism, not a policy. When writing drivers, programmers should pay particular attention to the following basic concept: When writing kernel code to access hardware, do not impose any specific policy on the user. Because different users have different needs, the driver should handle the problem

Using asynchronous notifications in device drivers can make access to the device accessible to the application by the driver when it is accessible. Therefore, applications that use nonblocking I/O do not need to poll the device for access, and blocking access can be superseded by asynchronous notifications like "break"

From one point of view, the role of a device driver is to provide a mechanism, not a policy. When writing drivers, programmers should pay particular attention to the following basic concept: When writing kernel code to access hardware, do not impose any specific policy on the user. Because different users have different needs, the driver should handle the problem

Main device number and secondary device number Those names are called special files, device files, or nodes that are simply called file system trees, and they are usually located in the/dev directory Typically, the main device number identifies the driver that co

According to ldd3, the Linux device model can be considered as an advanced textbook, which is unnecessary for most program authors. But I personally think: For an embedded Linux underlying programmer, this part of content is very important. For example, I learned about ARM9. many bus (such as SPI, IIC, IIS, and so on) have been written into subsystems in Linux, and no driver needs to be written by myself; u

One, what does the main device number and the secondary device number mean? Linu kernel is if the main device number to find the driver, the secondary device number to find the device.A: Usually a main device number represents a

Video:Driver Registration: Http://pan.baidu.com/s/1i34HcDBDevice registration: Http://pan.baidu.com/s/1kTlGkcRBus _ Device _ driver registration process? Registration flowchart? Devices generally need to be registered before they can register the driver– Now more and more hot-pluggable devices, in turn. Register the driver