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I have been operating Linux for more than three months. I have never understood some of the structures in the Code. For example, the relationship between platform_device and platform_driver is unclear. I searched it online and made a summary. The working order of the two is to define platform_device-> Register platform_device->, and then define platform_driver-> Register platform_driver. The registration process of the platform_device device must be c
PCI device driver development 1. Introduction to PCIThe PCI bus standard is a bus standard that connects external devices of the system. It is the most important bus in the PC and is actually the interface for interaction between various parts of the system. The transmission rate can reach 133 Mb/s. In the current PC architecture, almost all external devices use a variety of interface bus, which are connect
Platform-related fields are often seen in device drivers and distributed across multiple corners of the driver. This is also an important mechanism in the 2.6 kernel, it will be helpful for analyzing drivers in the future: In the linux2.6 device model, the three entities of bus, device, and
Upper and lower modules in the Windows Device Driver framework In the device driver framework of windows, the lower-layer module provides a data structure pointer to the upper-layer module. However, upper-layer modules do not directly obtain specific function pointers from this data structure, and do not directly use
| |----------------- -----------------------| | Mapping Layer | |-------------------------------------------------------------| | Generic Block Layer | |-------------------------------------------------------------| | I/o Scheduler Layer | |-------------------------------------------------------------| | BlOck Device Drive
The Driver Rollback (Driver rollback) feature helps ensure system stability. When you update a driver, the previous version of the driver package is automatically saved to a specific subfolder that is responsible for placing the system files (the system assigns a new value to the backup key in the relevant section of t
Original address: Linux device driver Learning (0)-hello, World Module Author: Tekkamanninja Linux device driver Learning (0)-Device driver Introduction Hello, World. ModuleThe role of device
Advantages and disadvantages of Linux device driver dynamic kernel insertion and direct integration into the kernel analysis Introduction: The company made a Linux-based Ethernet interface board, which is currently maintained by me, the main CPU of this board uses PowerPC, run the Linux system and add two external DPRAM modules. DPRAM uses the character device
Document directory "Porting the Module Program of Linux Device Driver II on Linux kernel 2.6.x" Project "Porting the Module Program of Linux Device Driver II on Linux kernel 2.6.x" Project "Porting the Module Program of Linux Device
Block device driver registration and logoffThe 1th work in block device drivers is usually to register themselves to the kernel, and the function to complete this task is Register_blkdev (), whose prototype is:int Register_blkdev (unsigned int major, const char *name);The major parameter is the main device number to be
Http://hi.baidu.com/linux_kernel/blog/item/5c8510dfbfdb9b1363279884.html In order to see the actual running effect, we select the 8139too Nic as an example. Program Cropping Code .The driver of a PCI device must describe itself to the PCI core in the kernel. At the same time, it must also tell the PCI core which devices can be driven by itself. The following describes two important data structures.Struct p
My philosophy: Simple and practical can be, do not engage in a pile of source code out, the results show people do not know how to use, Look at me: 1, in arch/arm/mach-xxx/own platform file to add I2C information, beauty its name Yue: i2c_board_info For example: static struct I2c_board_info __initdata xxxi2c_board_info[] = {{I2c_board_info ("Abcd1", 0x20),/* string to match the back, 0x20 from the device address * *. Platform_data = 0,},{I2c_board_in
1. All we learned before was the character device driver, just remember.Character Device driver:When our application layer reads and writes (read ()/write ()) character device drivers, the data is read and written by Byte/character, there is no buffer, because the data volume is small, can not randomly read data, such
"There are infinite advertisements and limited time." Don't look at the advertisements. Come back soon. (I find myself an advertising genius, but I am familiar with it, as if there is something similar in the game)Previously, we learned about the location structure of the USB driver in CE and the folder structure of the sample driver. Next, we need to know which interfaces usbd provides for us to implement
After two weeks of exploration, I finally had a preliminary understanding of the development of Linux device drivers. Next I will make a summary of the establishment of the development environment for Linux device drivers to facilitate future queries, it also helps beginners of the same path. When users are new to Linux drivers, they often don't know how to compile the
1, first review before writing the driver and data together led driver code, the code is as follows:#include Now the code of LED2 and Led3 is removed, leaving only led1, and we want to know how we use the Platform platform bus method to achieve the LED driver, we have probe function, and the Remove function, corresponding to the
There is a connection to the itunes icon on the screen, when the computer prompts to discover new hardware "Apple Mobile Device", Pop-up prompts box to install the driver, click Automatic Search fruitless, drive installation failed, the computer does not recognize the recovery mode of iPad2, pain. (also appeared when IPhone4 was upgraded) Then itunes prompts 1602 error. is not a lot of peak friends have se
1. Device and driver registration, regardless of who first who after, can be matched by the query bus When the device is hooked up to the bus, it matches all the drivers on the bus (matched with bus_type.match), and if the match succeeds, it calls Bus_ Type.probe or Driver.probe initializes the device and hook
3 design and implementation of micro-drive The micro-drive in the class/micro drive model directly controls the external device. As long as the micro-drive creates the specified function, the application can be easily invoked via the DIO adapter module, the PIO adapter module, or the (and) Gio class driver. These specified functions include channel-bound functions (MD-BINDDEV), channel creation/deletion fun
Create a new thin device//call path in the thin pool: driver. Create () 1.1 func (Devices *deviceset) AddDevice (hash, basehash string) error {//find parent Devicebaseinfo, err: = DEVICES.LOOKUPD Evice (Basehash) if err! = Nil {return Err}baseinfo.lock.lock () defer baseInfo.lock.Unlock () devices. Lock () Defer devices. Unlock ()//check Imageid/containerid if the corresponding image exists if info, _: = De
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