<?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>config_ep_by_speed</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="USB Gadget API for Linux" /><link rel="up" href="composite.html" title="Composite Device Framework" /><link rel="prev" href="API-struct-usb-composite-dev.html" title="struct usb_composite_dev" /><link rel="next" href="API-usb-add-function.html" title="usb_add_function" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">config_ep_by_speed</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-usb-composite-dev.html">Prev</a> </td><th width="60%" align="center">Composite Device Framework</th><td width="20%" align="right"> <a accesskey="n" href="API-usb-add-function.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-config-ep-by-speed"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>config_ep_by_speed — configures the given endpoint according to gadget speed. </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">config_ep_by_speed </strong>(</code></td><td>struct usb_gadget * <var class="pdparam">g</var>, </td></tr><tr><td> </td><td>struct usb_function * <var class="pdparam">f</var>, </td></tr><tr><td> </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"><a id="idm140476913505200"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>g</code></em></span></dt><dd><p> pointer to the gadget </p></dd><dt><span class="term"><em class="parameter"><code>f</code></em></span></dt><dd><p> usb function </p></dd><dt><span class="term"><em class="parameter"><code>_ep</code></em></span></dt><dd><p> the endpoint to configure </p></dd></dl></div></div><div class="refsect1"><a id="idm140476913498336"></a><h2>Return</h2><p> error code, 0 on success </p><p> This function chooses the right descriptors for a given endpoint according to gadget speed and saves it in the endpoint desc field. If the endpoint already has a descriptor assigned to it - overwrites it with currently corresponding descriptor. The endpoint maxpacket field is updated according to the chosen descriptor. </p></div><div class="refsect1"><a id="idm140476913496576"></a><h2>Note</h2><p> the supplied function should hold all the descriptors for supported speeds </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-usb-composite-dev.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="composite.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-usb-add-function.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">struct usb_composite_dev</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_add_function</span></td></tr></table></div></body></html>