-/* close.c
- * Linux CAN-bus device driver.
- * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
- * This software is released under the GPL-License.
- * Version 0.7 6 Aug 2001
- */
-
-#define __NO_VERSION__
-#include <linux/module.h>
-
-#include <linux/autoconf.h>
-#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)
-#define MODVERSIONS
-#endif
-
-#if defined (MODVERSIONS)
-#include <linux/modversions.h>
-#endif
-
-#include <linux/fs.h>
+/**************************************************************************/
+/* File: close.c - systemcall to close user connection to the driver */
+/* */
+/* LinCAN - (Not only) Linux CAN bus driver */
+/* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz> */
+/* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz> */
+/* Funded by OCERA and FRESCOR IST projects */
+/* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl> */
+/* */
+/* LinCAN is free software; you can redistribute it and/or modify it */
+/* under terms of the GNU General Public License as published by the */
+/* Free Software Foundation; either version 2, or (at your option) any */
+/* later version. LinCAN is distributed in the hope that it will be */
+/* useful, but WITHOUT ANY WARRANTY; without even the implied warranty */
+/* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
+/* General Public License for more details. You should have received a */
+/* copy of the GNU General Public License along with LinCAN; see file */
+/* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
+/* Cambridge, MA 02139, USA. */
+/* */
+/* To allow use of LinCAN in the compact embedded systems firmware */
+/* and RT-executives (RTEMS for example), main authors agree with next */
+/* special exception: */
+/* */
+/* Including LinCAN header files in a file, instantiating LinCAN generics */
+/* or templates, or linking other files with LinCAN objects to produce */
+/* an application image/executable, does not by itself cause the */
+/* resulting application image/executable to be covered by */
+/* the GNU General Public License. */
+/* This exception does not however invalidate any other reasons */
+/* why the executable file might be covered by the GNU Public License. */
+/* Publication of enhanced or derived LinCAN files is required although. */
+/**************************************************************************/
+#include "../include/can.h"
+#include "../include/can_sysdep.h"
#include "../include/main.h"
#include "../include/close.h"
-#include "../include/i82527.h"
#include "../include/setup.h"
+#include "../include/fasync.h"
+
+#define __NO_VERSION__
+#include <linux/module.h>
int can_close(struct inode *inode, struct file *file)
{
- /* Give up message buffer memory */
- if (objects_p[MINOR_NR]->fifo->buf_tx_entry)
- del_mem_from_list(objects_p[MINOR_NR]->fifo->buf_tx_entry);
- else
- CANMSG("objects_p[MINOR_NR]->fifo->buf_tx_entry is NULL\n");
- if (objects_p[MINOR_NR]->fifo->buf_rx_entry)
- del_mem_from_list(objects_p[MINOR_NR]->fifo->buf_rx_entry);
- else
- CANMSG("objects_p[MINOR_NR]->fifo->buf_rx_entry is NULL\n");
-
-/* FIXME: what about clearing chip HW status, stopping sending messages etc? */
-
- objects_p[MINOR_NR]->flags &= ~OPENED;
+ struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
+ struct canchip_t *chip;
+ struct canque_ends_t *qends;
+ struct msgobj_t *obj;
+ can_spin_irqflags_t iflags;
+ int minor_nr = INODE2MINOR_NR(inode);
+
+ if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
+ CANMSG("can_close: bad canuser magic\n");
+ return -ENODEV;
+ }
+ if ((chip=objects_p[minor_nr]->hostchip) == NULL) {
+ CANMSG("There is no hardware support for the device file with minor nr.: %d\n",minor_nr);
+ return -ENODEV;
+ }
+
+ obj = canuser->msgobj;
+ qends = canuser->qends;
+
+ #ifdef CAN_ENABLE_KERN_FASYNC
+
+ can_fasync(-1, file, 0);
+
+ #endif /*CAN_ENABLE_KERN_FASYNC*/
+
+ can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
+ list_del(&canuser->peers);
+ can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
+ canuser->qends = NULL;
+ canqueue_ends_dispose_kern(qends, file->f_flags & O_SYNC);
+
+ kfree(canuser);
+
+ can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
+ if(atomic_dec_and_test(&obj->obj_used)){
+ can_msgobj_clear_fl(obj,OPENED);
+ };
+ can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
+
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
MOD_DEC_USE_COUNT;
+ #endif
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
+ if (chip->hostdevice->hwspecops->release_device)
+ kref_put(&chip->hostdevice->refcount,chip->hostdevice->hwspecops->release_device);
+#endif
return 0;
}
projects / lincan.git / blobdiff