In order to increase the flexibility and convenience of the kernel, each driver should be designed as a dynamically installable kernel module. Therefore, a typical Linux device driver should contain the following parts of the code: · Driver module registration and logout function; · Set each open, close, read, write and other operational functions needed; • The device's interrupt service routine. The following pseudo-code gives an example of entering a character from the keyboard to give the reader a basic idea of ​​the composition of the device driver. (1) Define the read operation function Ssize mydev_read(...) { Obtain the semaphore of this device to ensure that no other process has access to the device; Apply for an interrupt flag to allow interruption; Issue a read command to the device; Will enter EH in the waiting queue, waiting for the interrupt to arrive: } (2) Define the interrupt service routine Void mydev_ihterpt(...) { The processor reads in characters; Set the interrupt flag: Wake up waiting for the waiter process: } (3) define the module initialization function Int init_module(void) Register with the system; Other initialization code; (4) Define the module destructor Void cleMup_modtLle(void) { Unregistered device; Photovoltaic Module,Pv Module,Solar Panel Module,Conventional Mono Solar Module Jiangxi Huayang New Energy Co.,Ltd , https://www.huayangenergy.com