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-0.2 9 Jul 2003
10 #include "../include/can.h"
11 #include "../include/can_sysdep.h"
12 #include "../include/main.h"
13 #include "../include/open.h"
14 #include "../include/i82527.h"
15 #include "../include/setup.h"
17 #define __NO_VERSION__
18 #include <linux/module.h>
20 int can_open(struct inode *inode, struct file *file)
24 struct canuser_t *canuser;
25 struct canque_ends_t *qends;
26 struct canque_edge_t *edge;
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 obj->flags |= 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 /* chip->flags |= OBJ_BUFFERS_ALLOCATED; */
51 } /* End of chip configuration */
53 canuser = (struct canuser_t *)kmalloc(sizeof(struct canuser_t), GFP_KERNEL);
54 if(canuser == NULL) goto no_canuser;
56 canuser->msgobj = obj;
57 canuser->magic = CAN_USER_MAGIC;
58 file->private_data = canuser;
60 qends = (struct canque_ends_t *)kmalloc(sizeof(struct canque_ends_t), GFP_KERNEL);
61 if(qends == NULL) goto no_qends;
62 canqueue_ends_init_kern(qends);
63 canuser->qends = qends;
65 list_add(&canuser->peers, &obj->obj_users);
67 if(canqueue_connect_edge(edge=canque_new_edge_kern(MAX_BUF_LENGTH),
68 canuser->qends, obj->qends)<0) goto no_tx_qedge;
70 if(canqueue_connect_edge(canuser->rx_edge0=canque_new_edge_kern(MAX_BUF_LENGTH),
71 obj->qends, canuser->qends)<0) goto no_rx_qedge;
72 /*FIXME: more generic model should be used there*/
73 canque_edge_decref(canuser->rx_edge0);
74 canque_edge_decref(edge);
76 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
83 canque_notify_bothends(edge, CANQUEUE_NOTIFY_DEAD_WANTED);
84 canque_edge_decref(edge);
86 list_del(&canuser->peers);
87 canuser->qends = NULL;
88 canqueue_ends_dispose_kern(qends, 1);
94 atomic_dec(&obj->obj_used);