extern struct semaphore device_sem; extern struct semaphore devclass_sem; extern int bus_add_device(struct device * dev); extern void bus_remove_device(struct device * dev); extern int bus_add_driver(struct device_driver *); extern void bus_remove_driver(struct device_driver *); extern int devclass_add_device(struct device *); extern void devclass_remove_device(struct device *); extern int devclass_add_driver(struct device_driver *); extern void devclass_remove_driver(struct device_driver *); extern int interface_add_dev(struct device *); extern void interface_remove_dev(struct device *); #ifdef CONFIG_HOTPLUG extern int dev_hotplug(struct device *dev, const char *action); extern int class_hotplug(struct device *dev, const char *action); #else static inline int dev_hotplug(struct device *dev, const char *action) { return 0; } static inline int class_hotplug(struct device *dev, const char *action) { return 0; } #endif