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<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 V1.75.2" /><link rel="home" href="index.html" title="The Linux-USB Host Side API" /><link rel="up" href="ch06.html" title="Chapter 6. Host Controller APIs" /><link rel="prev" href="re115.html" title="usb_hcd_giveback_urb" /><link rel="next" href="re117.html" title="usb_free_streams" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_alloc_streams</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re115.html">Prev</a> </td><th width="60%" align="center">Chapter 6. Host Controller APIs</th><td width="20%" align="right"> <a accesskey="n" href="re117.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_alloc_streams"><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" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">usb_alloc_streams </b>(</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" title="Arguments"><a id="id3119982"></a><h2>Arguments</h2><div class="variablelist"><dl><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" title="Description"><a id="id3120078"></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="re115.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch06.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re117.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>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>usb_free_streams</span></td></tr></table></div></body></html>
