What are the linux driver subsystems?

The Linux driver subsystem includes: 1. Device model, a framework used to manage and represent devices in the Linux kernel; 2. Character device subsystem, a framework used to manage character device drivers; 3. Block devices Subsystem, a framework for managing block device drivers; 4. File system subsystem, responsible for managing and operating file systems; 5. Network device subsystem, used to manage network interface devices and network protocol stacks; 6. Bus subsystem , used to manage the connections of various bus types and devices; 7. USB device subsystem, used to manage and support USB devices.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

The Linux driver subsystem is an important part of the Linux kernel. It is responsible for managing and controlling communication between hardware devices and the operating system. The following are some common Linux driver subsystems:

1. Device Model: The device model is a framework in the Linux kernel for managing and representing devices. It provides a unified device representation method so that drivers can interact with the device more conveniently.

2. Character Device Subsystem: The character device subsystem is a framework for managing character device drivers. It allows users to interact with devices, such as terminal devices, serial port devices, etc., through file I/O operations.

3. Block Device Subsystem: The block device subsystem is a framework for managing block device drivers. It allows efficient storage and access operations on block devices such as hard drives, flash memory, etc.

4. Filesystem Subsystem: The filesystem subsystem is responsible for managing and operating the file system. It provides support for various file system types and maps them to Linux's Virtual File System (VFS) layer.

5. Network Device Subsystem: Network Device Subsystem is used to manage network interface devices and network protocol stacks. It provides support for configuration, management and data transmission of network devices.

6. Bus Subsystem (Bus Subsystem): The bus subsystem is used to manage the connections of various bus types and devices. It provides an abstraction layer that allows drivers to interact with various bus types in a uniform manner.

7. USB Device Subsystem: USB device subsystem is used to manage and support USB devices. It is responsible for handling operations such as plug and unplug events, configuration and communication of USB devices.

These driver subsystems together constitute the driver framework of the Linux kernel and provide support for various hardware devices. Each subsystem has specialized interfaces and mechanisms that allow developers to write corresponding drivers to control and manage specific types of devices.

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