2 * Linux CAN-bus device driver.
3 * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
4 * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
5 * email:pisa@cmp.felk.cvut.cz
6 * This software is released under the GPL-License.
7 * Version lincan-0.3 17 Jun 2004
10 #include "../include/can.h"
11 #include "../include/can_sysdep.h"
12 #include "../include/main.h"
13 #include "../include/open.h"
14 #include "../include/setup.h"
16 #define __NO_VERSION__
17 #include <linux/module.h>
19 int can_open(struct inode *inode, struct file *file)
22 struct canchip_t *chip;
23 struct canuser_t *canuser;
24 struct canque_ends_t *qends;
25 struct canque_edge_t *edge;
26 can_spin_irqflags_t iflags;
28 if ( ((obj=objects_p[MINOR_NR]) == NULL) ||
29 ((chip=objects_p[MINOR_NR]->hostchip) == NULL) ) {
30 CANMSG("There is no hardware support for the device file with minor nr.: %d\n",MINOR_NR);
34 atomic_inc(&obj->obj_used);
35 DEBUGMSG("Device %d opened %d times.\n", MINOR_NR, atomic_read(&obj->obj_used));
36 can_msgobj_set_fl(obj,OPENED);
38 if (chip->flags & CHIP_CONFIGURED)
39 DEBUGMSG("Device is already configured.\n");
41 if (chip->chipspecops->chip_config(chip))
42 CANMSG("Error configuring chip.\n");
44 chip->flags |= CHIP_CONFIGURED;
46 if (chip->chipspecops->pre_read_config(chip,obj)<0)
47 CANMSG("Error initializing chip for receiving\n");
49 } /* End of chip configuration */
51 canuser = (struct canuser_t *)kmalloc(sizeof(struct canuser_t), GFP_KERNEL);
52 if(canuser == NULL) goto no_canuser;
54 canuser->userinfo.fileinfo.file = file;
55 canuser->msgobj = obj;
56 canuser->magic = CAN_USER_MAGIC;
57 file->private_data = canuser;
59 qends = (struct canque_ends_t *)kmalloc(sizeof(struct canque_ends_t), GFP_KERNEL);
60 if(qends == NULL) goto no_qends;
61 canqueue_ends_init_kern(qends);
62 canuser->qends = qends;
64 /*required to synchronize with RT-Linux context*/
65 can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
66 list_add(&canuser->peers, &obj->obj_users);
67 can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
69 if(canqueue_connect_edge(edge=canque_new_edge_kern(MAX_BUF_LENGTH),
70 canuser->qends, obj->qends)<0) goto no_tx_qedge;
72 if(canqueue_connect_edge(canuser->rx_edge0=canque_new_edge_kern(MAX_BUF_LENGTH),
73 obj->qends, canuser->qends)<0) goto no_rx_qedge;
74 /*FIXME: more generic model should be used there*/
75 canque_edge_decref(canuser->rx_edge0);
76 canque_edge_decref(edge);
78 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
85 canque_notify_bothends(edge, CANQUEUE_NOTIFY_DEAD_WANTED);
86 canque_edge_decref(edge);
88 list_del(&canuser->peers);
89 canuser->qends = NULL;
90 canqueue_ends_dispose_kern(qends, 1);
96 atomic_dec(&obj->obj_used);