由于具有PCMCIA，单个usb设备的Linux设备驱动程序不依赖于主机控制器。
As with PCMCIA, the Linux device drivers for the individual USB devices do not depend on the host controller.
HCI事件数据包：主机控制器以事件(event)通知hci驱动程序。
HCI event Packets: the Host Controller notifies the HCI Driver of events.
linux卡服务核心与主机控制器设备驱动程序、卡设备驱动程序及用户模式cardmgr后台进程交互。
The Linux card services core interacts with the host controller device driver, the card device drivers, and the user mode cardmgr daemon.
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