X-Git-Url: http://rtime.felk.cvut.cz/gitweb/lincan.git/blobdiff_plain/91dfab84182937b62ef64cb12d8e4f89e6d5c3ec..refs/heads/can-usb1:/lincan/src/close.c

diff --git a/lincan/src/close.c b/lincan/src/close.c
index 4df1533..6a0ca6e 100644
--- a/lincan/src/close.c
+++ b/lincan/src/close.c
@@ -1,17 +1,41 @@
-/* close.c
- * Linux CAN-bus device driver.
- * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
- * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
- * email:pisa@cmp.felk.cvut.cz
- * This software is released under the GPL-License.
- * Version lincan-0.2  9 Jul 2003
- */
+/**************************************************************************/
+/* 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"
 
@@ -21,14 +45,21 @@
 int can_close(struct inode *inode, struct file *file)
 {
 	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;
 
@@ -38,19 +69,27 @@ int can_close(struct inode *inode, struct file *file)
 
     #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)){
-		obj->flags &= ~OBJ_OPENED;
-		/* FIXME: what about clearing chip HW status, stopping sending messages etc? */
+		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;
 }