1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>struct usb_host_endpoint</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux-USB Host Side API"><link rel="up" href="hostside.html" title="Chapter&#160;4.&#160;Host-Side Data Types and Macros"><link rel="prev" href="hostside.html" title="Chapter&#160;4.&#160;Host-Side Data Types and Macros"><link rel="next" href="API-struct-usb-interface.html" title="struct usb_interface"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">struct usb_host_endpoint</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="hostside.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;4.&#160;Host-Side Data Types and Macros</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-struct-usb-interface.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-struct-usb-host-endpoint"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct usb_host_endpoint &#8212; 
2  host-side endpoint descriptor and queue
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="programlisting">
4struct usb_host_endpoint {
5  struct usb_endpoint_descriptor desc;
6  struct usb_ss_ep_comp_descriptor ss_ep_comp;
7  struct list_head urb_list;
8  void * hcpriv;
9  struct ep_device * ep_dev;
10  unsigned char * extra;
11  int extralen;
12  int enabled;
13  int streams;
14};  </pre></div><div class="refsect1"><a name="idp1112641564"></a><h2>Members</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term">desc</span></dt><dd><p>
15descriptor for this endpoint, wMaxPacketSize in native byteorder
16      </p></dd><dt><span class="term">ss_ep_comp</span></dt><dd><p>
17SuperSpeed companion descriptor for this endpoint
18      </p></dd><dt><span class="term">urb_list</span></dt><dd><p>
19urbs queued to this endpoint; maintained by usbcore
20      </p></dd><dt><span class="term">hcpriv</span></dt><dd><p>
21for use by HCD; typically holds hardware dma queue head (QH)
22with one or more transfer descriptors (TDs) per urb
23      </p></dd><dt><span class="term">ep_dev</span></dt><dd><p>
24ep_device for sysfs info
25      </p></dd><dt><span class="term">extra</span></dt><dd><p>
26descriptors following this endpoint in the configuration
27      </p></dd><dt><span class="term">extralen</span></dt><dd><p>
28how many bytes of <span class="quote">&#8220;<span class="quote">extra</span>&#8221;</span> are valid
29      </p></dd><dt><span class="term">enabled</span></dt><dd><p>
30URBs may be submitted to this endpoint
31      </p></dd><dt><span class="term">streams</span></dt><dd><p>
32number of USB-3 streams allocated on the endpoint
33      </p></dd></dl></div></div><div class="refsect1"><a name="idp1112648868"></a><h2>Description</h2><p>
34   USB requests are always queued to a given endpoint, identified by a
35   descriptor within an active interface in a given USB configuration.
36</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hostside.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="hostside.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-struct-usb-interface.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter&#160;4.&#160;Host-Side Data Types and Macros&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">struct usb_interface</span></td></tr></table></div></body></html>
37