/* * can_close - can4linux CAN driver module * * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. *  * Copyright (c) 2001 port GmbH Halle/Saale * (c) 2001 Heinz-J黵gen Oertel (oe@port.de) *          Claus Schroeter (clausi@chemie.fu-berlin.de) * derived from the the LDDK can4linux version *     (c) 1996,1997 Claus Schroeter (clausi@chemie.fu-berlin.de) *------------------------------------------------------------------ * $Header: /z2/cvsroot/products/0530/software/can4linux/src/close.c,v 1.7 2008/11/23 12:05:29 oe Exp $ * *-------------------------------------------------------------------------- * * * *-------------------------------------------------------------------------- *//*** \file close.c* \author Heinz-J黵gen Oertel, port GmbH* $Revision: 1.7 $* $Date: 2008/11/23 12:05:29 $***//***/#include <linux/pci.h>#include "defs.h"#ifndef DOXYGEN_SHOULD_SKIP_THIS#endif /* DOXYGEN_SHOULD_SKIP_THIS *//***************************************************************************//**** \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 can_close ( __LDDK_CLOSE_PARAM ){unsigned int minor = iminor(inode);int rx_fifo = ((struct _instance_data *)(file->private_data))->rx_index;    DBGin();    /* printk(KERN_INFO "--> closing minor %d  fifo %d \n", minor, rx_fifo); */    if(file->private_data) {	kfree(file->private_data);    }    CanWaitFlag[minor][rx_fifo] = 0;    selfreception[minor][rx_fifo] = 0;    atomic_dec(&Can_isopen[minor]);		/* flag device as free */    if(atomic_read(&Can_isopen[minor]) > 0) {	DBGprint(DBG_BRANCH, ("leaving close() without shut down"));	DBGout();	return 0;    }    /*     * all processes released the driver     * now shut down the CAN controller     */    DBGprint(DBG_BRANCH, ("stop chip and release resources"));    CAN_StopChip(minor);#if !defined(PCM3680) && !defined(CPC_104) && !defined(CPC_PCM_104)    /* call this before freeing any memory or io area.     * this can contain registers needed by Can_FreeIrq()     */    /* printk(KERN_INFO "    Releasing IRQ %d\n", IRQ[minor]); */    Can_FreeIrq(minor, IRQ[minor]);    /* should the resources be released in a manufacturer specific file?     * is it always depending on the hardware?     */    /* since Vx.y (2.4?) macros defined in ioport.h,       called is  __release_region()  */#if defined(SSV_MCP2515)	;#elif defined(CAN_PORT_IO) && !defined(KVASER_PCICAN)    release_region(Base[minor], can_range[minor]);#else# if defined(CAN_INDEXED_PORT_IO)    release_region(Base[minor], 2);# else#  ifndef CAN4LINUX_PCI    /* release I/O memory mapping -> release virtual memory */    /* printk("iounmap %p \n", can_base[minor]); */    iounmap(can_base[minor]);    /* Release the memory region */    /* printk("release mem %x \n", Base[minor]); */    release_mem_region(Base[minor], can_range[minor]);#  endif# endif#endif#else  /* !defined(TARGETS with CAN_Release() in target.c */    CAN_Release(minor);#endif /* !defined(TARGETS with CAN_Release() in target.c */#ifdef CAN_USE_FILTER    Can_FilterCleanup(minor);#endif    DBGout();    return -EBADF;}