input layer

[Paul Akkermans]

Hi group,   I am trying to analyse a part of the input layer of the kernel 2.6.7 (input.c) (see below). The problem is that I don't fully understand what this piece of code does. Can anybody help me?    static int __init input_init(void) {  int retval = -ENOMEM;    input_class = class_simple_create(THIS_MODULE, "input");  if (IS_ERR(input_class))   return PTR_ERR(input_class);  input_proc_init();  retval = register_chrdev(INPUT_MAJOR, "input", &input_fops);  if (retval) {   printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);   remove_proc_entry("devices", proc_bus_input_dir);   remove_proc_entry("handlers", proc_bus_input_dir);   remove_proc_entry("input", proc_bus);   class_simple_destroy(input_class);   return retval;  }    retval = devfs_mk_dir("input");  if (retval) {   remove_proc_entry("devices", proc_bus_input_dir);   remove_proc_entry("handlers", proc_bus_input_dir);   remove_proc_entry("input", proc_bus);   unregister_chrdev(INPUT_MAJOR, "input");   class_simple_destroy(input_class);  }  return retval; }       thanks in advance,   Paul Akkermans