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<!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_gadget_vbus_draw</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="core.html" title="Core Objects and Methods" /><link rel="prev" href="API-usb-gadget-vbus-connect.html" title="usb_gadget_vbus_connect" /><link rel="next" href="API-usb-gadget-vbus-disconnect.html" title="usb_gadget_vbus_disconnect" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">usb_gadget_vbus_draw</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-gadget-vbus-connect.html">Prev</a>&#160;</td><th width="60%" align="center">Core Objects and Methods</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-usb-gadget-vbus-disconnect.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-usb-gadget-vbus-draw"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_gadget_vbus_draw &#8212; 
     constrain controller's VBUS power usage
 </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_gadget_vbus_draw </strong>(</code></td><td>struct usb_gadget * <var class="pdparam">gadget</var>, </td></tr><tr><td>&#160;</td><td>unsigned <var class="pdparam">mA</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140476913880528"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>gadget</code></em></span></dt><dd><p>
     The device whose VBUS usage is being described
    </p></dd><dt><span class="term"><em class="parameter"><code>mA</code></em></span></dt><dd><p>
     How much current to draw, in milliAmperes.  This should be twice
     the value listed in the configuration descriptor bMaxPower field.
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140476913875328"></a><h2>Description</h2><p>
   This call is used by gadget drivers during SET_CONFIGURATION calls,
   reporting how much power the device may consume.  For example, this
   could affect how quickly batteries are recharged.
   </p><p>

   Returns zero on success, else negative errno.
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