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  • MTK USB 子系统

    一、USB 子系统初始化

    1. kernel/drivers/usb/core/usb.c

    1 subsys_initcall(usb_init);
     1 static int __init usb_init(void)
     2 {
     3     int retval;
     4     if (nousb) {
     5         pr_info("%s: USB support disabled
    ", usbcore_name);
     6         return 0;
     7     }
     8     
     9     usb_init_pool_max();
    10 
    11     retval = usb_debugfs_init();
    12     if (retval)
    13         goto out;
    14 
    15     usb_acpi_register();
    16     retval = bus_register(&usb_bus_type);
    17     if (retval)
    18         goto bus_register_failed;
    19     retval = bus_register_notifier(&usb_bus_type, &usb_bus_nb);
    20     if (retval)
    21         goto bus_notifier_failed;
    22     retval = usb_major_init();
    23     if (retval)
    24         goto major_init_failed;
    25     retval = usb_register(&usbfs_driver);
    26     if (retval)
    27         goto driver_register_failed;
    28     retval = usb_devio_init();
    29     if (retval)
    30         goto usb_devio_init_failed;
    31     retval = usb_hub_init();
    32     if (retval)
    33         goto hub_init_failed;
    34     retval = usb_register_device_driver(&usb_generic_driver, THIS_MODULE);
    35     if (!retval)
    36         goto out;
    37 
    38     usb_hub_cleanup();
    39 hub_init_failed:
    40     usb_devio_cleanup();
    41 usb_devio_init_failed:
    42     usb_deregister(&usbfs_driver);
    43 driver_register_failed:
    44     usb_major_cleanup();
    45 major_init_failed:
    46     bus_unregister_notifier(&usb_bus_type, &usb_bus_nb);
    47 bus_notifier_failed:
    48     bus_unregister(&usb_bus_type);
    49 bus_register_failed:
    50     usb_acpi_unregister();
    51     usb_debugfs_cleanup();
    52 out:
    53     return retval;
    54 }
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  • 原文地址:https://www.cnblogs.com/jiangjh/p/10114736.html
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