/*

 * 	connector.h

 * 

 * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>

 * All rights reserved.

 * 

 * 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 __CONNECTOR_H

#define __CONNECTOR_H

#include <asm/types.h>

#define CN_IDX_CONNECTOR		0xffffffff

#define CN_VAL_CONNECTOR		0xffffffff

/*

 * Process Events connector unique ids -- used for message routing

 */

#define CN_IDX_PROC			0x1

#define CN_VAL_PROC			0x1

#define CN_IDX_CIFS			0x2

#define CN_VAL_CIFS                     0x1

#define CN_W1_IDX			0x3	/* w1 communication */

#define CN_W1_VAL			0x1

#define CN_IDX_V86D			0x4

#define CN_VAL_V86D_UVESAFB		0x1

#define CN_IDX_BB			0x5	/* BlackBoard, from the TSP GPL sampling framework */

#define CN_NETLINK_USERS		6

/*

 * Maximum connector's message size.

 */

#define CONNECTOR_MAX_MSG_SIZE		16384

/*

 * idx and val are unique identifiers which 

 * are used for message routing and 

 * must be registered in connector.h for in-kernel usage.

 */

struct cb_id {

	__u32 idx;

	__u32 val;

};

struct cn_msg {

	struct cb_id id;

	__u32 seq;

	__u32 ack;

	__u16 len;		/* Length of the following data */

	__u16 flags;

	__u8 data[0];

};

/*

 * Notify structure - requests notification about

 * registering/unregistering idx/val in range [first, first+range].

 */

struct cn_notify_req {

	__u32 first;

	__u32 range;

};

/*

 * Main notification control message

 * *_notify_num 	- number of appropriate cn_notify_req structures after 

 *				this struct.

 * group 		- notification receiver's idx.

 * len 			- total length of the attached data.

 */

struct cn_ctl_msg {

	__u32 idx_notify_num;

	__u32 val_notify_num;

	__u32 group;

	__u32 len;

	__u8 data[0];

};

#ifdef __KERNEL__

#include <asm/atomic.h>

#include <linux/list.h>

#include <linux/workqueue.h>

#include <net/sock.h>

#define CN_CBQ_NAMELEN		32

struct cn_queue_dev {

	atomic_t refcnt;

	unsigned char name[CN_CBQ_NAMELEN];

	struct workqueue_struct *cn_queue;

	struct list_head queue_list;

	spinlock_t queue_lock;

	struct sock *nls;

};

struct cn_callback_id {

	unsigned char name[CN_CBQ_NAMELEN];

	struct cb_id id;

};

struct cn_callback_data {

	void (*destruct_data) (void *);

	void *ddata;

	void *callback_priv;

	void (*callback) (void *);

	void *free;

};

struct cn_callback_entry {

	struct list_head callback_entry;

	struct work_struct work;

	struct cn_queue_dev *pdev;

	struct cn_callback_id id;

	struct cn_callback_data data;

	u32 seq, group;

};

struct cn_ctl_entry {

	struct list_head notify_entry;

	struct cn_ctl_msg *msg;

};

struct cn_dev {

	struct cb_id id;

	u32 seq, groups;

	struct sock *nls;

	void (*input) (struct sk_buff *skb);

	struct cn_queue_dev *cbdev;

};

int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));

void cn_del_callback(struct cb_id *);

int cn_netlink_send(struct cn_msg *, u32, gfp_t);

int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));

void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);

struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);

void cn_queue_free_dev(struct cn_queue_dev *dev);

int cn_cb_equal(struct cb_id *, struct cb_id *);

void cn_queue_wrapper(struct work_struct *work);

#endif				/* __KERNEL__ */

#endif				/* __CONNECTOR_H */