X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lincan.git/blobdiff_plain/4cf24de229090b1ab6279570a564d224e13dd706..04ac67cc3cac14cd601daacd0592121ec0b84012:/lincan/src/close.c

diff --git a/lincan/src/close.c b/lincan/src/close.c
index 7ac3574..2e0090d 100644
--- a/lincan/src/close.c
+++ b/lincan/src/close.c
@@ -1,45 +1,84 @@
-/* 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;
-	MOD_DEC_USE_COUNT;
+	struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
+	struct canque_ends_t *qends;
+	struct msgobj_t *obj;
+	can_spin_irqflags_t iflags;
+
+	if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
+		CANMSG("can_close: bad canuser magic\n");
+		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
 	return 0;
 }