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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_ep_clear_halt</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="USB Gadget API for Linux" /><link rel="up" href="ch03s03.html" title="Core Objects and Methods" /><link rel="prev" href="re24.html" title="usb_ep_set_halt" /><link rel="next" href="re26.html" title="usb_ep_set_wedge" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_ep_clear_halt</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re24.html">Prev</a> </td><th width="60%" align="center">Core Objects and Methods</th><td width="20%" align="right"> <a accesskey="n" href="re26.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_ep_clear_halt"><a id="API-usb-ep-clear-halt"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_ep_clear_halt —
clears endpoint halt, and resets toggle
</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_ep_clear_halt </b>(</code></td><td>struct usb_ep * <var class="pdparam">ep</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2940516"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>ep</code></em></span></dt><dd><p>
the bulk or interrupt endpoint being reset
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2940542"></a><h2>Description</h2><p>
Use this when responding to the standard usb <span class="quote">“<span class="quote">set interface</span>”</span> request,
for endpoints that aren't reconfigured, after clearing any other state
in the endpoint's i/o queue.
</p><p>
Returns zero, or a negative error code. On success, this call clears
the underlying hardware state reflecting endpoint halt and data toggle.
Note that some hardware can't support this request (like pxa2xx_udc),
and accordingly can't correctly implement interface altsettings.
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