//主要是在/sys/class/ 下創建一個 “name”的文件夾 ！從linux內核2.6的某個版本之后，devfs不復存在，udev成為devfs的替代。相比devfs，udev有很多優勢，在此就不羅嗦了，提醒一點，udev是應用層的東東，不要試圖在內核的配置選項里找到它;加入對udev的支持很簡單，以作者所寫的一個字符設備驅動為例，在驅動初始化的代碼里調用class_create為該設備創建一個class，再為每個設備調用 class_device_create創建對應的設備。大致用法如下： struct class *myclass = class_create(THIS_MODULE, “my_device_driver”); class_device_create(myclass, NULL, MKDEV(major_num, 0), NULL, “my_device”); 這樣的module被加載時，udev daemon就會自動在/dev下創建my_device設備文件。class_create() ------------------------------------------------- linux-2.6.22/include/linux/device.h struct class *class_create(struct module *owner, const char *name)class_create - create a struct class structure@owner: pointer to the module that is to "own" this struct class@name: pointer to a string for the name of this class. 在/sys/class/下創建類目錄class_device_create() ------------------------------------------------- linux-2.6.22/include/linux/device.h struct class_device *class_device_create(struct class *cls,struct class_device *parent,dev_t devt,struct device *device,const char *fmt, ...)class_device_create - creates a class device and registers it with sysfs@cls: pointer to the struct class that this device should be registered to.@parent: pointer to the parent struct class_device of this new device, if any.@devt: the dev_t for the char device to be added.@device: a pointer to a struct device that is assiociated with this class device.@fmt: string for the class device's name //主要是在/sys/class/ 下創建一個 “name”的文件夾 ！從linux內核2.6的某個版本之后，devfs不復存在，udev成為devfs的替代。相比devfs，udev有很多優勢，在此就不羅嗦了，提醒一點，udev是應用層的東東，不要試圖在內核的配置選項里找到它;加入對udev的支持很簡單，以作者所寫的一個字符設備驅動為例，在驅動初始化的代碼里調用class_create為該設備創建一個class，再為每個設備調用 class_device_create創建對應的設備。大致用法如下： struct class *myclass = class_create(THIS_MODULE, “my_device_driver”); class_device_create(myclass, NULL, MKDEV(major_num, 0), NULL, “my_device”); 這樣的module被加載時，udev daemon就會自動在/dev下創建my_device設備文件。class_create() ------------------------------------------------- linux-2.6.22/include/linux/device.h struct class *class_create(struct module *owner, const char *name)class_create - create a struct class structure@owner: pointer to the module that is to "own" this struct class@name: pointer to a string for the name of this class. 在/sys/class/下創建類目錄class_device_create() ------------------------------------------------- linux-2.6.22/include/linux/device.h struct class_device *class_device_create(struct class *cls,struct class_device *parent,dev_t devt,struct device *device,const char *fmt, ...)class_device_create - creates a class device and registers it with sysfs@cls: pointer to the struct class that this device should be registered to.@parent: pointer to the parent struct class_device of this new device, if any.@devt: the dev_t for the char device to be added.@device: a pointer to a struct device that is assiociated with this class device.@fmt: string for the class device's name

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