struct usb_host

struct usb_host_endpoint
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Name

struct usb_host_endpoint — host-side endpoint descriptor and queue

Synopsis

struct usb_host_endpoint {
  struct usb_endpoint_descriptor desc;
  struct list_head urb_list;
  void * hcpriv;
  struct ep_device * ep_dev;
  unsigned char * extra;
  int extralen;
  int enabled;
};

Members

desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
urb_list: urbs queued to this endpoint; maintained by usbcore
hcpriv: for use by HCD; typically holds hardware dma queue head (QH) with one or more transfer descriptors (TDs) per urb
ep_dev: ep_device for sysfs info
extra: descriptors following this endpoint in the configuration
extralen: how many bytes of “extra” are valid
enabled: URBs may be submitted to this endpoint

Description

USB requests are always queued to a given endpoint, identified by a descriptor within an active interface in a given USB configuration.