1. 根目录:
2. drivers
3. staging
4. dgrp
5. dgrp_common.h

/*
 *
 * Copyright 1999 Digi International (www.digi.com)
 *     James Puzzo <jamesp at digi dot com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 */

#ifndef __DGRP_COMMON_H
#define __DGRP_COMMON_H

#define DIGI_VERSION "1.9-29"

#include <linux/fs.h>
#include <linux/timer.h>
#include "drp.h"

#define DGRP_TTIME 100
#define DGRP_RTIME 100

/************************************************************************
 * All global storage allocation.
 ************************************************************************/

extern int dgrp_register_cudevices; /* enable legacy cu devices */
extern int dgrp_register_prdevices; /* enable transparent print devices */
extern int dgrp_poll_tick;          /* Poll interval - in ms */

extern struct list_head nd_struct_list;

struct dgrp_poll_data {
	spinlock_t poll_lock;
	struct timer_list timer;
	int poll_tick;
	ulong poll_round;	/* Timer rouding factor */
	long node_active_count;
};

extern struct dgrp_poll_data dgrp_poll_data;
extern void dgrp_poll_handler(unsigned long arg);

/* from dgrp_mon_ops.c */
extern const struct file_operations dgrp_mon_ops;

/* from dgrp_tty.c */
extern int dgrp_tty_init(struct nd_struct *nd);
extern void dgrp_tty_uninit(struct nd_struct *nd);

/* from dgrp_ports_ops.c */
extern const struct file_operations dgrp_ports_ops;

/* from dgrp_net_ops.c */
extern const struct file_operations dgrp_net_ops;

/* from dgrp_dpa_ops.c */
extern const struct file_operations dgrp_dpa_ops;
extern void dgrp_dpa_data(struct nd_struct *, int, u8 *, int);

/* from dgrp_sysfs.c */
extern int dgrp_create_class_sysfs_files(void);
extern void dgrp_remove_class_sysfs_files(void);

extern void dgrp_create_node_class_sysfs_files(struct nd_struct *nd);
extern void dgrp_remove_node_class_sysfs_files(struct nd_struct *nd);

extern void dgrp_create_tty_sysfs(struct un_struct *un, struct device *c);
extern void dgrp_remove_tty_sysfs(struct device *c);

/* from dgrp_specproc.c */
extern void dgrp_unregister_proc(void);
extern void dgrp_register_proc(void);

/*-----------------------------------------------------------------------*
 *
 *  Declarations for common operations:
 *
 *      (either used by more than one of net, mon, or tty,
 *       or in interrupt context (i.e. the poller))
 *
 *-----------------------------------------------------------------------*/

void dgrp_carrier(struct ch_struct *ch);


/*
 *  ID manipulation macros (where c1 & c2 are characters, i is
 *  a long integer, and s is a character array of at least three members
 */

static inline void ID_TO_CHAR(long i, char *s)
{
	s[0] = ((i & 0xff00)>>8);
	s[1] = (i & 0xff);
	s[2] = 0;
}

static inline long CHAR_TO_ID(char *s)
{
	return ((s[0] & 0xff) << 8) | (s[1] & 0xff);
}

static inline struct nd_struct *nd_struct_get(long major)
{
	struct nd_struct *nd;

	list_for_each_entry(nd, &nd_struct_list, list) {
		if (major == nd->nd_major)
			return nd;
	}

	return NULL;
}

static inline int nd_struct_add(struct nd_struct *entry)
{
	struct nd_struct *ptr;

	ptr = nd_struct_get(entry->nd_major);

	if (ptr)
		return -EBUSY;

	list_add_tail(&entry->list, &nd_struct_list);

	return 0;
}

static inline int nd_struct_del(struct nd_struct *entry)
{
	struct nd_struct *nd;

	nd = nd_struct_get(entry->nd_major);

	if (!nd)
		return -ENODEV;

	list_del(&nd->list);
	return 0;
}

#endif /* __DGRP_COMMON_H */