1 /**************************************************************************/
2 /* File: close.c - systemcall to close user connection to the driver */
4 /* LinCAN - (Not only) Linux CAN bus driver */
5 /* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz> */
6 /* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz> */
7 /* Funded by OCERA and FRESCOR IST projects */
8 /* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl> */
10 /* LinCAN is free software; you can redistribute it and/or modify it */
11 /* under terms of the GNU General Public License as published by the */
12 /* Free Software Foundation; either version 2, or (at your option) any */
13 /* later version. LinCAN is distributed in the hope that it will be */
14 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty */
15 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
16 /* General Public License for more details. You should have received a */
17 /* copy of the GNU General Public License along with LinCAN; see file */
18 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
19 /* Cambridge, MA 02139, USA. */
21 /* To allow use of LinCAN in the compact embedded systems firmware */
22 /* and RT-executives (RTEMS for example), main authors agree with next */
23 /* special exception: */
25 /* Including LinCAN header files in a file, instantiating LinCAN generics */
26 /* or templates, or linking other files with LinCAN objects to produce */
27 /* an application image/executable, does not by itself cause the */
28 /* resulting application image/executable to be covered by */
29 /* the GNU General Public License. */
30 /* This exception does not however invalidate any other reasons */
31 /* why the executable file might be covered by the GNU Public License. */
32 /* Publication of enhanced or derived LinCAN files is required although. */
33 /**************************************************************************/
35 #include "../include/can.h"
36 #include "../include/can_sysdep.h"
37 #include "../include/main.h"
38 #include "../include/close.h"
39 #include "../include/setup.h"
40 #include "../include/fasync.h"
42 #define __NO_VERSION__
43 #include <linux/module.h>
45 int can_close(struct inode *inode, struct file *file)
47 struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
48 struct canchip_t *chip;
49 struct canque_ends_t *qends;
51 can_spin_irqflags_t iflags;
53 if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
54 CANMSG("can_close: bad canuser magic\n");
57 if ((chip=objects_p[MINOR_NR]->hostchip) == NULL) {
58 CANMSG("There is no hardware support for the device file with minor nr.: %d\n",MINOR_NR);
62 obj = canuser->msgobj;
63 qends = canuser->qends;
65 #ifdef CAN_ENABLE_KERN_FASYNC
67 can_fasync(-1, file, 0);
69 #endif /*CAN_ENABLE_KERN_FASYNC*/
71 can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
72 list_del(&canuser->peers);
73 can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
74 canuser->qends = NULL;
75 canqueue_ends_dispose_kern(qends, file->f_flags & O_SYNC);
79 can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
80 if(atomic_dec_and_test(&obj->obj_used)){
81 can_msgobj_clear_fl(obj,OPENED);
83 can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
85 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
89 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10))
90 if (chip->hostdevice->hwspecops->release_device)
91 kref_put(&chip->hostdevice->refcount,chip->hostdevice->hwspecops->release_device);