Linux Hybrid device driver

1. Linux Hybrid device driver model

① in Linux systems, there are a class of character devices, which have the same main device number (10), but the second device number is different, we call this device a hybrid device (Miscdevice). All promiscuous devices form a linked list, and the kernel looks for the corresponding promiscuous device based on the secondary device number when accessing the device.

Using struct Miscdevice in ②linux to describe hybrid devices

struct Miscdevice  {    int  minor;     Const Char *name;     Const struct file_operations *fops;     struct list_head list;     struct device *parent;     struct device *this_device;};

③linux using the Misc_register function to register a hybrid device driver

int misc_register (struct miscdevice * misc)

④linux using the Misc_deregister function to unregister a hybrid device driver

int misc_deregister (struct miscdevice *misc)

Linux Hybrid device driver