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/**

 * input_register_handler - register a new input handler * @handler: handler to be registered * * This function registers a new input handler (interface) for input * devices in the system and attaches it to all input devices that * are compatible with the handler. */int input_register_handler(struct input_handler *handler){	struct input_dev *dev;	int error;	error = mutex_lock_interruptible(&input_mutex);	if (error)		return error;	INIT_LIST_HEAD(&handler->h_list);	list_add_tail(&handler->node, &input_handler_list);	list_for_each_entry(dev, &input_dev_list, node)		input_attach_handler(dev, handler);	input_wakeup_procfs_readers();	mutex_unlock(&input_mutex);	return 0;}

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