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Editor to share with you how to create / dev/xxx name in linux, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

At the beginning of writing Linux device drivers, we often use the mknod command to create device nodes manually. In fact, the Linux kernel provides us with a set of functions that can be used to automatically create a corresponding device node in the / dev directory when the module is loaded, and delete it when unloading the module, of course, as long as the user space is ported to udev.

The struct class structure is defined in the kernel. As the name implies, a struct class structure type variable corresponds to a class, and the kernel also provides class_create (...). Function, which can be used to create a class, which is stored under sysfs. Once the class is created, call device_create (...) Function to create the corresponding device node in the / dev directory. In this way, when the module is loaded, the udev in user space will automatically respond to device_create (...) Function to find the corresponding class under / sysfs to create the device node.

Note that in earlier kernel versions of 2.6, device_create (...) The function name is different, it is class_device_create (...) So compiling previous module programs in the new kernel sometimes reports errors because of different function names and some changes in the parameter settings

Struct class and device_create (…) And device_create (…) All defined in / include/linux/device.h, be sure to include this header file when using it, otherwise the compiler will report an error.

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