<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <HTML ><HEAD ><TITLE >parport_find_class</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="The Linux 2.4 Parallel Port Subsystem" HREF="book1.html"><LINK REL="UP" TITLE=" Linux parallel port driver API reference " HREF="a950.html"><LINK REL="PREVIOUS" TITLE="parport_find_device" HREF="r1048.html"><LINK REL="NEXT" TITLE="parport_register_driver" HREF="r1138.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The Linux 2.4 Parallel Port Subsystem</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="r1048.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="r1138.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="AEN1097" ></A ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >parport_find_class</SPAN ></SPAN ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN1101" ></A ><H2 >Name</H2 >parport_find_class -- find a device in a specified class </DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN1104" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN1106" ></A ><P ></P ><P ><CODE ><CODE CLASS="FUNCDEF" >int <TT CLASS="FUNCTION" >parport_find_class </TT ></CODE >(parport_device_class <TT CLASS="PARAMETER" ><I >cls</I ></TT >, int <TT CLASS="PARAMETER" ><I >from</I ></TT >);</CODE ></P ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN1114" ></A ><H2 >Arguments</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="PARAMETER" ><I >cls</I ></TT ></DT ><DD ><P > required class </P ></DD ><DT ><TT CLASS="PARAMETER" ><I >from</I ></TT ></DT ><DD ><P > previous device number found in search, or <TT CLASS="CONSTANT" >NULL</TT > for new search </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN1128" ></A ><H2 >Description</H2 ><P > This walks through the list of parallel port devices looking for a device whose 'CLS' string matches <TT CLASS="PARAMETER" ><I >cls</I ></TT > in their IEEE 1284 Device ID. </P ><P > When a device is found matching those requirements, its device number is returned; if there is no matching device, a negative value is returned. </P ><P > A new search it initiated by passing <TT CLASS="CONSTANT" >NULL</TT > as the <TT CLASS="PARAMETER" ><I >from</I ></TT > argument. If <TT CLASS="PARAMETER" ><I >from</I ></TT > is not <TT CLASS="CONSTANT" >NULL</TT >, the search continues from that device. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="r1048.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="book1.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="r1138.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >parport_find_device</SPAN ></SPAN ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="a950.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >parport_register_driver</SPAN ></SPAN ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >