i2c_del_driver(&via686a_driver);
i2c_isa_del_driver(&via686a_driver);
static void __exit sm_via686a_exit(void){	pci_unregister_driver(&via686a_pci_driver);	if (s_bridge != NULL) {		i2c_del_driver(&via686a_driver);		pci_dev_put(s_bridge);		s_bridge = NULL;	}}