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¼ÌUHCIµÄÇý¶¯Ö®ºó,ÎÒÃǶÔUSB ControlµÄÔË×÷ÓÐÁËÒ»¶¨µÄÁ˽â.ÔÚ½ÓÏÂÀ´µÄ·ÖÎöÖÐ,ÎÒÃǶÔUSBÉ豸µÄÇý¶¯×öÒ»¸öÈ«ÃæµÄ·ÖÎö,ÎÒÃÇÏÈ´ÓHUBµÄÇý¶¯ËµÆð.¹ØÓÚHUB,usb2.0 specÉÏÓÐÏêϸµÄ¶¨Òå,»ùÓÚÕⲿ·ÝµÄ´úÂëλÓÚlinux-2.6.25/drivers/usb/coreÏÂ,Ò²¾ÍÊÇ˵,Õⲿ·Ý´úÂëÊÇλÓÚcoreÏÂ,ºÍ¾ßÌåÉ豸ÊÇÎ޹صÄ,ÒòΪ¸÷³§É̵Ähub¶¼Êǰ´ÕÕspecµÄÒªÇóÀ´Éè¼ÆµÄ.
¶þ:UHCIÇý¶¯ÖеÄroot hub
¼ÇµÃÔÚ·ÖÎöUHCIÇý¶¯µÄʱºò,ÔøÏêϸ·ÖÎö¹ýroot hubµÄ³õʼ»¯²Ù×÷.ΪÁË·ÖÎö·½±ã,½«´úÂëÆ¬¶ÎÁгöÈçÏÂ:
usb_add_hcd() à usb_alloc_dev():
struct usb_device *usb_alloc_dev(struct usb_device *parent,
               struct usb_bus *bus, unsigned port1)
{
    ……
    ……
    //usb_device,ÄÚǶÓÐstruct device½á¹¹,¶ÔÕâ¸ö½á¹¹½øÐгõʼ»¯
    device_initialize(&dev->dev);
    dev->dev.bus = &usb_bus_type;
    dev->dev.type = &usb_device_type;
    ……
    ……
}
Ò»¿´µ½Ç°Ãæ¶ÔdevµÄ¸³Öµ,¸ù¾ÝÎÒÃǶÔÉ豸ģÐ͵ÄÀí½â,Ò»µ©Õâ¸ödevice½øÐÐ×¢²á,¾Í»á·¢ÉúdriverºÍdeviceµÄÆ¥Åä¹ý³ÌÁË.
²»¹ý,ÏÖÔÚ»¹²»ÊÇ·ÖÎöÕâ¸ö¹ý³ÌµÄʱºò,ÎÒÃÇÏÈÀ´¿´Ò»ÏÂ,USB×ÓϵͳÖеÄÁ½ÖÖÇý¶¯.
 
Èý:USB×ÓϵͳÖеÄÁ½ÖÖÇý¶¯
linux-2.6.25/drivers/usb/core/driver.cÖÐ,ÎÒÃÇ¿ÉÒÔÕÒµ½Á½ÖÖregister driverµÄ·½Ê½,·Ö±ðΪusb_register_driver()ºÍusb_register_device_driver().·Ö±ðÀ´·ÖÎöÒ»ÏÂÕâÁ½¸ö½Ó¿Ú.
 
usb_register_device_driver()½Ó¿ÚµÄ´úÂëÈçÏÂ:
int usb_register_device_driver(struct usb_device_driver *new_udriver,
        struct module *owner)
{
    int retval = 0;
 
    if (usb_disabled())
        return -ENODEV;
 
    new_udriver->drvwrap.for_d


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