<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>usb_alloc_streams</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="hcd.html" title="Chapter 6. Host Controller APIs" /><link rel="prev" href="API-usb-hcd-giveback-urb.html" title="usb_hcd_giveback_urb" /><link rel="next" href="API-usb-free-streams.html" title="usb_free_streams" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">usb_alloc_streams</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-hcd-giveback-urb.html">Prev</a> </td><th width="60%" align="center">Chapter 6. Host Controller APIs</th><td width="20%" align="right"> <a accesskey="n" href="API-usb-free-streams.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-usb-alloc-streams"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_alloc_streams — allocate bulk endpoint stream IDs. </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <strong class="fsfunc">usb_alloc_streams </strong>(</code></td><td>struct usb_interface * <var class="pdparam">interface</var>, </td></tr><tr><td> </td><td>struct usb_host_endpoint ** <var class="pdparam">eps</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">num_eps</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">num_streams</var>, </td></tr><tr><td> </td><td>gfp_t <var class="pdparam">mem_flags</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="idm140259811059728"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>interface</code></em></span></dt><dd><p> alternate setting that includes all endpoints. </p></dd><dt><span class="term"><em class="parameter"><code>eps</code></em></span></dt><dd><p> array of endpoints that need streams. </p></dd><dt><span class="term"><em class="parameter"><code>num_eps</code></em></span></dt><dd><p> number of endpoints in the array. </p></dd><dt><span class="term"><em class="parameter"><code>num_streams</code></em></span></dt><dd><p> number of streams to allocate. </p></dd><dt><span class="term"><em class="parameter"><code>mem_flags</code></em></span></dt><dd><p> flags hcd should use to allocate memory. </p></dd></dl></div></div><div class="refsect1"><a id="idm140259811048400"></a><h2>Description</h2><p> Sets up a group of bulk endpoints to have num_streams stream IDs available. Drivers may queue multiple transfers to different stream IDs, which may complete in a different order than they were queued. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-usb-hcd-giveback-urb.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="hcd.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-usb-free-streams.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">usb_hcd_giveback_urb</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">usb_free_streams</span></td></tr></table></div></body></html>