at91_uart_close.c

at91rm9200 linux 下t6963的驱动

/*
 * can_close - can4linux CAN driver module
 *
 *
 * can4linux -- LINUX CAN device driver source
 * 
 * Copyright (c) 2001 port GmbH Halle/Saale
 * (c) 2001 Heinz-J黵gen Oertel ([e-mail])
 *          Claus Schroeter ([e-mail])
 * derived from the the LDDK can4linux version
 *     (c) 1996,1997 Claus Schroeter ([e-mail])
 *------------------------------------------------------------------
 * $Header: /z2/cvsroot/products/0530/software/can4linux/src/can_close.c,v 1.10 2005/04/01 16:03:43 oe Exp $
 *
 *--------------------------------------------------------------------------
 *
 *
 * modification history
 * --------------------
 * $Log: can_close.c,v $
 * Revision 1.10  2005/04/01 16:03:43  oe
 * -  call unmap() before releaseing the memory region
 *
 * Revision 1.9  2004/12/14 09:36:35  oe
 * - Release for kernel 2.6 with support for 82527 included
 *
 * Revision 1.8  2003/12/29 15:18:55  oe
 * - support for indexed-i/o
 *
 * Revision 1.7  2003/08/27 13:06:26  oe
 * - Version 3.0
 *
 * Revision 1.6  2003/07/05 14:28:55  oe
 * - all changes for the new 3.0: try to eliminate hw depedencies at run-time.
 *   configure for HW at compile time
 *
 * Revision 1.5  2002/08/08 17:57:24  oe
 * - at close() use release_mem_region() release_region()
 *
 * Revision 1.4  2001/09/14 14:58:09  oe
 * first free release
 *
 * Revision 1.3  2001/09/04 15:50:57  oe
 * - changed function type
 * - added return value to "int" functions
 *
 * Revision 1.2  2001/06/15 15:31:35  oe
 * - added PCI support EMS CPC-PCI
 *
 * Revision 1.1.1.1  2001/06/11 18:30:54  oe
 * minimal version can4linux embedded, compile time Konfigurierbar
 *
 * Revision 1.1  2001/06/07 08:29:24  oe
 * Initial revision
 *
 *
 *
 *
 *--------------------------------------------------------------------------
 */


/**
* \file can_close.c
* \author Heinz-J黵gen Oertel, port GmbH
* $Revision: 1.10 $
* $Date: 2005/04/01 16:03:43 $
*
*
*/
/*
*
*/
#include "at91_uart_defs.h"




/***************************************************************************/
/**
*
* \brief int close(int fd);
* close a file descriptor
* \param fd The descriptor to close.
*
* \b close closes a file descriptor, so that it no longer
*  refers to any device and may be reused.
* \returns
* close returns zero on success, or -1 if an error occurred.
* \par ERRORS
*
* the following errors can occur
*
* \arg \c BADF \b fd isn't a valid open file descriptor 
*

*/
__LDDK_CLOSE_TYPE at91_uart_close ( __LDDK_CLOSE_PARAM )
{
	struct at91_uart_port *port;
	port=file->private_data;

	release_mem_region(port->base, 0x4000);

	iounmap(port->membase);
	

	
	if( (port->Can_isopen) > 0) {
	    --(port->Can_isopen);		/* flag device as free */
	}
	
    return -EBADF;
}