Structured comments updated.

[lincan.git] / lincan / src / open.c

diff --git a/lincan/src/open.c b/lincan/src/open.c
index f9ff10847c481077449ae900d6a0d9084f5c51eb..deb027ca8e8a430ffeb205e89e0721ca0bd921b0 100644 (file)
--- a/lincan/src/open.c
+++ b/lincan/src/open.c
@@ -1,41 +1,30 @@
 /* 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 0.7  6 Aug 2001
+ * Version lincan-0.2  9 Jul 2003
  */
 
-#define __NO_VERSION__
-#include <linux/module.h> 
-
-#include <linux/autoconf.h>
-#if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)
-#define MODVERSIONS
-#endif
-
-#if defined (MODVERSIONS)
-#include <linux/modversions.h>
-#endif
-
-#include <linux/fs.h>
-#include <linux/version.h>
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
-#include <linux/malloc.h>
-#else
-#include <linux/slab.h>
-#endif
-#include <linux/version.h>
-
+#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__
+#include <linux/module.h>
+
 int can_open(struct inode *inode, struct file *file)
 {
        struct msgobj_t *obj;
        struct chip_t *chip;
-       struct canfifo_t *fifo;
+       struct canuser_t *canuser;
+       struct canque_ends_t *qends;
+       struct canque_edge_t *edge;
+       can_spin_irqflags_t iflags;
 
        if ( ((obj=objects_p[MINOR_NR]) == NULL) || 
                        ((chip=objects_p[MINOR_NR]->hostchip) == NULL) ) {
@@ -43,64 +32,68 @@ int can_open(struct inode *inode, struct file *file)
                return -ENODEV;
        }
 
-       if (objects_p[MINOR_NR]->flags & OPENED) {
-               CANMSG("Sorry, only single open per device file.\n");
-               return -EBUSY;
-       }
-       else
-               objects_p[MINOR_NR]->flags |= OPENED;
+       atomic_inc(&obj->obj_used);
+       DEBUGMSG("Device %d opened %d times.\n", MINOR_NR, atomic_read(&obj->obj_used));
+       can_msgobj_set_fl(obj,OPENED);
 
-       if (chip->flags & 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 |= CONFIGURED; 
+                       chip->flags |= CHIP_CONFIGURED; 
+
+               if (chip->chipspecops->pre_read_config(chip,obj)<0)
+                       CANMSG("Error initializing chip for receiving\n");
+
        } /* End of chip configuration */
 
-       /* Allocate output buffer memory for the opened device */
-       fifo = objects_p[MINOR_NR]->fifo;
-       fifo->buf_tx_entry=(struct canmsg_t *)kmalloc(MAX_BUF_LENGTH * sizeof(struct canmsg_t), GFP_KERNEL);
-       if (fifo->buf_tx_entry == NULL)
-               return -ENOMEM;
-       else
-               if ( add_mem_to_list(fifo->buf_tx_entry) )
-                       return -ENOMEM;
-       /* Allocate input buffer memory for the opened device */
-       fifo->buf_rx_entry=(struct canmsg_t *)kmalloc(MAX_BUF_LENGTH * sizeof(struct canmsg_t), GFP_KERNEL);
-       if (fifo->buf_rx_entry == NULL)
-               return -ENOMEM;
-       else
-               if ( add_mem_to_list(fifo->buf_rx_entry) )
-                       return -ENOMEM;
-
-       /* In- and output buffer initialization */
-       fifo->tx_readp = fifo->buf_tx_entry;
-       fifo->tx_writep = fifo->buf_tx_entry;
-       fifo->rx_readp = fifo->buf_rx_entry;
-       fifo->rx_writep = fifo->buf_rx_entry;
-       fifo->rx_size = MAX_BUF_LENGTH * sizeof(struct canmsg_t);
-       fifo->tx_size = fifo->rx_size;
-
-#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,3,0))
-       init_waitqueue(&fifo->readq);
-       init_waitqueue(&fifo->writeq);
-#else
-       init_waitqueue_head(&fifo->readq);
-       init_waitqueue_head(&fifo->writeq);
-#endif
-
-       fifo->rx_in_progress = 0;
-       fifo->tx_in_progress = 0;
-
-       chip->flags |= BUFFERS_ALLOCATED;
-
-       if (chip->chipspecops->pre_read_config(chip,obj)<0)
-               CANMSG("Error initializing chip for receiving\n");
-               
+       canuser = (struct canuser_t *)kmalloc(sizeof(struct canuser_t), GFP_KERNEL);
+       if(canuser == NULL) goto no_canuser;
+       canuser->flags=0;
+       canuser->userinfo.fileinfo.file = file;
+       canuser->msgobj = obj;
+       canuser->magic = CAN_USER_MAGIC;
+       file->private_data = canuser;
+
+       qends = (struct canque_ends_t *)kmalloc(sizeof(struct canque_ends_t), GFP_KERNEL);
+       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);
+       can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
+
+       if(canqueue_connect_edge(edge=canque_new_edge_kern(MAX_BUF_LENGTH),
+               canuser->qends, obj->qends)<0) goto no_tx_qedge;
+
+       if(canqueue_connect_edge(canuser->rx_edge0=canque_new_edge_kern(MAX_BUF_LENGTH),
+               obj->qends, canuser->qends)<0) goto no_rx_qedge;
+       /*FIXME: more generic model should be used there*/
+       canque_edge_decref(canuser->rx_edge0);
+       canque_edge_decref(edge);
+
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
        MOD_INC_USE_COUNT;
 #endif 
+
        return 0;
+       
+    no_rx_qedge:
+       canque_notify_bothends(edge, CANQUEUE_NOTIFY_DEAD_WANTED);
+       canque_edge_decref(edge);
+    no_tx_qedge:
+       list_del(&canuser->peers);
+       canuser->qends = NULL;
+       canqueue_ends_dispose_kern(qends, 1);
+
+    no_qends:
+       kfree(canuser);
+
+    no_canuser:
+       atomic_dec(&obj->obj_used);
+       return -ENOMEM;
 }