Automatically loading device driver modules is a common method to implement device drivers in Linux systems. This article will introduce how to write code to implement the function of automatically loading device driver modules.
The device driver module is a key component in the Linux system that interacts with hardware devices. In the Linux kernel, the device driver module exists in the form of a kernel module and can be loaded into the kernel when needed to control and access the device.
To realize the function of automatically loading device driver modules, we can use udev (user space device manager) to monitor device events in the system and load the corresponding driver modules as needed. The following is a sample code that demonstrates how to use udev and Shell scripts to automatically load driver modules.
First, we need to write a udev rule file to define device events and corresponding operations. Create a file called "99-mydevice.rules" and add the following content to the file:
ACTION=="add", SUBSYSTEM=="mydevice", RUN+="/path/to/load_driver.sh"
In the above rule, we define an action (ACTION) as "add" and a device event for the subsystem (SUBSYSTEM) as "mydevice". When this device event occurs, we will run a Shell script "/path/to/load_driver.sh" to load the device driver module.
Next, we need to write a shell script to load the device driver module. Create a file called "load_driver.sh" and add the following content to the file:
#!/bin/bas