discovery.h

sparc硬件平台上的红外协议

/*********************************************************************
*                
* Filename:      discovery.h
* Version:       
* Description:   
* Status:        Experimental.
* Author:        Dag Brattli <[e-mail]>
* Created at:    Tue Apr  6 16:53:53 1999
* Modified at:   Tue Oct  5 10:05:10 1999
* Modified by:   Dag Brattli <[e-mail]>
* 
*     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
*     Copyright (c) 2000-2002 Jean Tourrilhes <[e-mail]>
*     
*     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 of 
*     the License, or (at your option) any later version.
* 
*     This program is distributed in the hope that it will be useful,
*     but WITHOUT ANY WARRANTY; without even the implied warranty of
*     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*     GNU General Public License for more details.
* 
*     You should have received a copy of the GNU General Public License 
*     along with this program; if not, write to the Free Software 
*     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
*     MA 02111-1307 USA
*     
********************************************************************/

#ifndef DISCOVERY_H
#define DISCOVERY_H


#include "irda.h"
#include "irqueue.h"		/* irda_queue_t */
#include "irlap_event.h"	/* LAP_REASON */

#define DISCOVERY_EXPIRE_TIMEOUT 2*sysctl_discovery_timeout
#define DISCOVERY_DEFAULT_SLOTS  0
#define SEQ_START_TOKEN ((void *)1)
/*
*  This type is used by the protocols that transmit 16 bits words in 
*  little endian format. A little endian machine stores MSB of word in
*  byte[1] and LSB in byte[0]. A big endian machine stores MSB in byte[0] 
*  and LSB in byte[1].
*
* This structure is used in the code for things that are endian neutral
* but that fit in a word so that we can manipulate them efficiently.
* By endian neutral, I mean things that are really an array of bytes,
* and always used as such, for example the hint bits. Jean II
*/
typedef union {
	__u16 word;
	__u8  byte[2];
} __u16_host_order;

/* Same purpose, different application */

/* Types of discovery */
typedef enum {
	DISCOVERY_LOG,		/* What's in our discovery log */
		DISCOVERY_ACTIVE,	/* Doing our own discovery on the medium */
		DISCOVERY_PASSIVE,	/* Peer doing discovery on the medium */
		EXPIRY_TIMEOUT,		/* Entry expired due to timeout */
} DISCOVERY_MODE;

#define NICKNAME_MAX_LEN 21

/* Basic discovery information about a peer */
typedef struct irda_device_info		discinfo_t;	/* linux/irda.h */

												/*
												* The DISCOVERY structure is used for both discovery requests and responses
*/
typedef struct discovery_t {
	irda_queue_t	q;		/* Must be first! */
	
	discinfo_t	data;		/* Basic discovery information */
	int		name_len;	/* Lenght of nickname */
	
	LAP_REASON	condition;	/* More info about the discovery */
							int		gen_addr_bit;	/* Need to generate a new device
							* address? */
							int		nslots;		/* Number of slots to use when
							* discovering */
							time_t 	timestamp;	/* Last time discovered */
							unsigned long	firststamp;	/* First time discovered */
} discovery_t;

void irlmp_add_discovery(hashbin_t *cachelog, discovery_t *discovery);
void irlmp_add_discovery_log(hashbin_t *cachelog, hashbin_t *log);
void irlmp_expire_discoveries(hashbin_t *log, __u32 saddr, int force);
struct irda_device_info *irlmp_copy_discoveries(hashbin_t *log, int *pn,
												__u16 mask, int old_entries);

#endif