-/* open.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-0.3 17 Jun 2004
- */
+/**************************************************************************/
+/* File: open.c - systemcall to open new user connection/handle */
+/* */
+/* 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/open.h"
-#include "../include/i82527.h"
#include "../include/setup.h"
#define __NO_VERSION__
int can_open(struct inode *inode, struct file *file)
{
struct msgobj_t *obj;
- struct chip_t *chip;
+ struct canchip_t *chip;
struct canuser_t *canuser;
struct canque_ends_t *qends;
struct canque_edge_t *edge;
can_spin_irqflags_t iflags;
+ char openflag; // Martin Petera: Object already opened
+ int minor_nr = INODE2MINOR_NR(inode);
- if ( ((obj=objects_p[MINOR_NR]) == NULL) ||
- ((chip=objects_p[MINOR_NR]->hostchip) == NULL) ) {
- CANMSG("There is no hardware support for the device file with minor nr.: %d\n",MINOR_NR);
+ if ((minor_nr < 0) || (minor_nr >= MAX_TOT_MSGOBJS)) {
+ CANMSG("can_open: bad minor %d\n", minor_nr);
+ return -ENODEV;
+ }
+
+ if ( ((obj=objects_p[minor_nr]) == NULL) ||
+ ((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;
}
atomic_inc(&obj->obj_used);
- DEBUGMSG("Device %d opened %d times.\n", MINOR_NR, atomic_read(&obj->obj_used));
+ DEBUGMSG("Device %d opened %d times.\n", minor_nr, atomic_read(&obj->obj_used));
+ openflag = can_msgobj_test_fl(obj,OPENED); // Martin Petera: store previous status
can_msgobj_set_fl(obj,OPENED);
- if (chip->flags & CHIP_CONFIGURED)
+ if (chip->flags & CHIP_CONFIGURED)
DEBUGMSG("Device is already configured.\n");
else {
if (chip->chipspecops->chip_config(chip))
CANMSG("Error configuring chip.\n");
else
- chip->flags |= CHIP_CONFIGURED;
+ chip->flags |= CHIP_CONFIGURED;
+ } /* End of chip configuration */
+
+ /* Martin Petera: Fix for HCAN2
+ * pre_read was called only once -> Opening second MSG object from userspace
+ * didn't call function to configure MSG object for receive.
+ * FIX: Call pre_read once for each MSG object
+ **/
+ if (!openflag) {
if (chip->chipspecops->pre_read_config(chip,obj)<0)
CANMSG("Error initializing chip for receiving\n");
+ }
- } /* End of chip configuration */
canuser = (struct canuser_t *)kmalloc(sizeof(struct canuser_t), GFP_KERNEL);
if(canuser == NULL) goto no_canuser;
if(qends == NULL) goto no_qends;
canqueue_ends_init_kern(qends);
canuser->qends = qends;
-
+
/*required to synchronize with RT-Linux context*/
can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
list_add(&canuser->peers, &obj->obj_users);
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
MOD_INC_USE_COUNT;
-#endif
+#endif
return 0;
-
+
no_rx_qedge:
canque_notify_bothends(edge, CANQUEUE_NOTIFY_DEAD_WANTED);
canque_edge_decref(edge);
projects / lincan.git / blobdiff