/*
* Init
*/
static int __init usb_init(void)
{
int retval;
if (nousb) {
pr_info("%s: USB support disabled\n", usbcore_name);
return 0;
}
retval = usb_debugfs_init();
if (retval)
goto out;
retval = ksuspend_usb_init();
if (retval)
goto out;
retval = bus_register(&usb_bus_type);
if (retval)
goto bus_register_failed;
retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb);
if (retval)
goto bus_notifier_failed;
retval = usb_major_init();
if (retval)
goto major_init_failed;
retval = usb_register(&usbfs_driver);
if (retval)
goto driver_register_failed;
retval = usb_devio_init();
if (retval)
goto usb_devio_init_failed;
retval = usbfs_init();
if (retval)
goto fs_init_failed;
retval = usb_hub_init();
if (retval)
goto hub_init_failed;
retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE);
if (!retval)
goto out;
usb_hub_cleanup();
hub_init_failed:
usbfs_cleanup();
fs_init_failed:
usb_devio_cleanup();
usb_devio_init_failed:
usb_deregister(&usbfs_driver);
driver_register_failed:
usb_major_cleanup();
major_init_failed:
bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
bus_notifier_failed:
bus_unregister(&usb_bus_type);
bus_register_failed:
ksuspend_usb_cleanup();
out:
return retval;
}
/*
* Init
*/
static int __init usb_init(void)
{
int retval;
if (nousb) {
pr_info ("%s: USB support disabled\n", usbcore_name);
return 0;
}
//总线对象注册
retval = bus_register(&usb_bus_type);
if (retval)
goto out;
//usb-host
retval = usb_host_init();
if (retval)
goto host_init_failed;
retval = usb_major_init();
if (retval)
goto major_init_failed;
//usbfs注册
retval = usb_register(&usbfs_driver);
if (retval)
goto driver_register_failed;
retval = usbdev_init();
if (retval)
goto usbdevice_init_failed;
retval = usbfs_init();
if (retval)
goto fs_init_failed;
//初始化hub模块:注册hub驱动、创建hub端口检测线程
retval = usb_hub_init();
if (retval)
goto hub_init_failed;
retval = driver_register(&usb_generic_driver);
if (!retval)
goto out;
usb_hub_cleanup();
hub_init_failed:
usbfs_cleanup();
fs_init_failed:
usbdev_cleanup();
usbdevice_init_failed:
usb_deregister(&usbfs_driver);
driver_register_failed:
usb_major_cleanup();
major_init_failed:
usb_host_cleanup();
host_init_failed:
bus_unregister(&usb_bus_type);
out:
return retval;
}