If I can't accompany you to the end
Do you regret that we were holding hands
If I hadn't met you
Now, I
Where to stay
All love is an adventure.
That would be willingly.
Waiting for all the suspense in our lives
My passionately devoted lover.
She's my lover.
The love she gave me was like
The morning with the dew
How I want to give her my true
My dearly Beloved.
I want to be lonely for her
Like the night is deep
This chapte
first, the Linux system divides the device into 3 categories: Character device, block device, network device. Using drivers:1, character device : Refers to a byte can only one byte read and write devices, can not randomly read the device
by Fanxiushu 2016 05-15 reprint or quote this article, please indicate the original author.People who have used VMware should know that VMware virtual machines have such a feature,When a USB device is plugged into the host, the USB device can be accessed in VMware's virtual machine system via setup.and accessing this USB device is just as true as inserting the US
Linux Device Driver Article 3: How to Write a simple character device driver ?, Linux Article 3
In the first article on linux Device Drivers: the device drivers briefly introduce character drivers. This article briefly introduces how to write a simple character device driver
Linux Device Driver category, character device driver, how to add cdev to the kernel ?, Driver category cdev
1. Linux Device Driver category
By hardware of Managed Devices
Character Device
Access by byte streams, which can be accessed sequentially or at specified locations
Touch screen LCD for serial port terminals
Bl
In the Linux device driver first: Introduction to the device driver briefly describes the character driver, this article briefly describes how to write a simple character device driver. This article draws on the source code in the LDD, realizes a hardware device-independent character
The complex device drivers mentioned here involve PCI, USB, network devices, block devices, and so on (strictly speaking, these devices are conceptually not parallel, for example, a character device is tied to a block device, and a PCI, USB device, etc. may be part of a character d
A new device driver model-platform (platform) device driver, platform device driver (platform_device) and platform driver (Platform_driver) is introduced into the Linux2.6 kernel, The introduction of platform devices makes Linux device drivers more portable.First, platform equipmentPlatform
PCI device creation process
This part is divided into two parts for learning. One is to refer to the previous articles, analyze the source code of ld1_and sculld, and the other is to refer to ldd3 to learn PCI.
Part 1Ldd_bus declares the ldd_bus_type of a bus_type structure:
Struct bus_type ldd_bus_type = {
. Name = "LDD ",
. Match = ldd_match,
. Uevent = ldd_uevent,
};
The code for adding ldd_bus_type to and detaching from the kernel is as follows:
As there are too many notes in Chapter 10, I will post the previous notes first.
1. functions used to open various devices
Device
Function used to open a device
File
Createfile (pszname is the path name or UNC path name)
Directory
Createfile (pszname is the path name or UNC path name ). if you specify the file_flag_backup_semantics flag when calling createfile, Windows al
First, we know that the driver is part of the kernel, so what role does the driver play in the kernel?The role of the device driver in the kernel: they are separate "black boxes" that enable a particular hardware to respond to a well-defined internal programming interface that completely hides the work details of the device. (Plainly, the driver does not have any implementation details that are invisible to
Loaded from http://blog.csdn.net/sjwangjinbao/article/details/6077225When writing a bus device driver, it was found that the struct device in the 2.6.33.2 kernel had no members of BUS_ID, and the const char *init_name member was found. However, this member cannot be used directly to set and read the device name.The method for kernel operation is dev_name and Dev_
1, after the system plugged into the USB device, from the console interface has the following prompt:From the console information, you can see the inserted USB device name.As you can see, the plugged-in USB device is sde4.However, if the CRT tool is remotely connected to the past, you can use the following command to view the USB
2.1Network Driver StructureThe architecture 1 of the Linux Network Driver is shown in.It can be divided into four layers:(1) Protocol Interface Layer
(2) network device interface layer
(3) Device Driver Function Layer
(4) network device and media layer.
Network Driver Focus: completes the device driver Function Layer
I
===============================This article is the original site, welcome to reprint!Reprint please indicate the source: http://www.cnblogs.com/gdt-a20
===============================
The kernel developer will be the bus, device, drive the three are abstracted from the software idea, cleverly established the relationship between the two, make it more visualization. Combined with the knowledge that we have learned before, in general, the relationship b
How to use the device tree of linux drivers and how to use the device tree of linux drivers
The Device Tree describes the hardware from the software perspective, and DTS is the Device Tree source file. DTC is responsible for converting DTS to DTB, and DTB is the binary form of DTS for machine use.
The
From one point of view, the role of a device driver is to provide a mechanism, not a policy.When writing drivers, the program ape 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 of how to make the hardware available. And the problem of how to use hardware is left
first, how to operate the equipment
The operation of the device in Linux is done by means of a file, including open, read, and write.
For device files, it is generally called a device node,
The node has a property that is the device number (the primary device number, the se
Reference:Http://elinux.org/Device_Tree_Usagehttp://blog.csdn.net/sgmenghuo/article/details/45071615 Basic Data Format
The device tree is a simple tree structure that contains nodes and attributes. Properties are described by the form of key-value pairs, a node can contain multiple attributes or child nodes, and a simple. DTS format device tree is shown below.
/dts-v1/;
/{
Node1 {
A-string-prop
Smart Device Security: China's online smart device Security Situation Report in 2017, and the situation report in 2017
Smart Device Security: China's online smart device Security Situation Report in 2017. In recent years, security incidents of online smart devices have occurred from time to time, and CNCERT has continu
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