close.c

PCM9880是一块PC/104界面的双端口隔离CAN总线通讯卡

/* close.c
 * Linux CAN-bus device driver.
 * Written by Arnaud Westenberg email:[e-mail]
 * This software is released under the GPL-License.
 * Version 0.7  6 Aug 2001
 */

#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 "../include/main.h"
#include "../include/close.h"
#include "../include/i82527.h"
#include "../include/setup.h"

int can_close(struct inode *inode, struct file *file)
{
	/* Give up message buffer memory */
	if (objects_p[MINOR_NR]->fifo->buf_tx_entry)
		del_mem_from_list(objects_p[MINOR_NR]->fifo->buf_tx_entry);
	else
		CANMSG("objects_p[MINOR_NR]->fifo->buf_tx_entry is NULL\n");
	if (objects_p[MINOR_NR]->fifo->buf_rx_entry)
		del_mem_from_list(objects_p[MINOR_NR]->fifo->buf_rx_entry);
	else
		CANMSG("objects_p[MINOR_NR]->fifo->buf_rx_entry is NULL\n");

/* FIXME: what about clearing chip HW status, stopping sending messages etc? */
	
	objects_p[MINOR_NR]->flags &= ~OPENED;
	MOD_DEC_USE_COUNT;

	return 0;
}