sysfs_create_group(cradle_kobj, &cradle_prop_attr_group)函数的功能参数返回值

The function sysfs_create_group() is used to create a new attribute group for a given kernel object in the sysfs filesystem. The parameters passed to the function are:

1. cradle_kobj - a pointer to the kernel object for which the attribute group is being created.
2. grp - a pointer to the attribute group structure that defines the attributes to be added to the group.

The function returns zero on success, and a negative error code on failure.

Example usage:

static struct attribute_group cradle_attr_grp = {
.name = "cradle",
.attrs = cradle_attrs,
};

...

if (sysfs_create_group(&cradle_kobj, &cradle_attr_grp)) {
printk(KERN_ERR "Failed to create sysfs group for cradle\n");
return -ENOMEM;
}