linux-libre/drivers/isdn/divert/divert_init.c

/* $Id divert_init.c,v 1.5.6.2 2001/01/24 22:18:17 kai Exp $
 *
 * Module init for DSS1 diversion services for i4l.
 *
 * Copyright 1999       by Werner Cornelius (werner@isdn4linux.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>

#include "isdn_divert.h"

MODULE_DESCRIPTION("ISDN4Linux: Call diversion support");
MODULE_AUTHOR("Werner Cornelius");
MODULE_LICENSE("GPL");

/****************************************/
/* structure containing interface to hl */
/****************************************/
isdn_divert_if divert_if = {
	DIVERT_IF_MAGIC,	/* magic value */
	DIVERT_CMD_REG,		/* register cmd */
	ll_callback,		/* callback routine from ll */
	NULL,			/* command still not specified */
	NULL,			/* drv_to_name */
	NULL,			/* name_to_drv */
};

/*************************/
/* Module interface code */
/* no cmd line parms     */
/*************************/
static int __init divert_init(void)
{
	int i;

	if (divert_dev_init()) {
		printk(KERN_WARNING "dss1_divert: cannot install device, not loaded\n");
		return (-EIO);
	}
	if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR) {
		divert_dev_deinit();
		printk(KERN_WARNING "dss1_divert: error %d registering module, not loaded\n", i);
		return (-EIO);
	}
	printk(KERN_INFO "dss1_divert module successfully installed\n");
	return (0);
}

/**********************/
/* Module deinit code */
/**********************/
static void __exit divert_exit(void)
{
	unsigned long flags;
	int i;

	spin_lock_irqsave(&divert_lock, flags);
	divert_if.cmd = DIVERT_CMD_REL; /* release */
	if ((i = DIVERT_REG_NAME(&divert_if)) != DIVERT_NO_ERR) {
		printk(KERN_WARNING "dss1_divert: error %d releasing module\n", i);
		spin_unlock_irqrestore(&divert_lock, flags);
		return;
	}
	if (divert_dev_deinit()) {
		printk(KERN_WARNING "dss1_divert: device busy, remove cancelled\n");
		spin_unlock_irqrestore(&divert_lock, flags);
		return;
	}
	spin_unlock_irqrestore(&divert_lock, flags);
	deleterule(-1); /* delete all rules and free mem */
	deleteprocs();
	printk(KERN_INFO "dss1_divert module successfully removed \n");
}

module_init(divert_init);
module_exit(divert_exit);