Man page 9 : kobject_add

kobject_add - the main kobject add function

int kobject_add(struct kobject *  kobj , struct kobject *  parent , const char *  fmt , ... );

kobj
    the kobject to add

parent
    pointer to the parent of the kobject.

fmt
    format to name the kobject with.

...
    variable arguments

The kobject name is set and added to the kobject hierarchy in this function.

If parent is set, then the parent of the kobj will be set to it. If parent is NULL, then the parent of the kobj will be set to the kobject associted with the kset assigned to this kobject. If no kset is assigned to the kobject, then the kobject will be located in the root of the sysfs tree.

If this function returns an error, kobject_put must be called to properly clean up the memory associated with the object. Under no instance should the kobject that is passed to this function be directly freed with a call to kfree, that can leak memory.

Note, no « add » uevent will be created with this call, the caller should set up all of the necessary sysfs files for the object and then call kobject_uevent with the UEVENT_ADD parameter to ensure that userspace is properly notified of this kobjectAqs creation.