include/linux/connector.h

   1 /*
   2  *      connector.h
   3  *
   4  * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
   5  * All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #ifndef __CONNECTOR_H
  23 #define __CONNECTOR_H
  24
  25 #include <asm/types.h>
  26
  27 #define CN_IDX_CONNECTOR                0xffffffff
  28 #define CN_VAL_CONNECTOR                0xffffffff
  29
  30 /*
  31  * Process Events connector unique ids -- used for message routing
  32  */
  33 #define CN_IDX_PROC                     0x1
  34 #define CN_VAL_PROC                     0x1
  35 #define CN_IDX_CIFS                     0x2
  36 #define CN_VAL_CIFS                     0x1
  37 #define CN_W1_IDX                       0x3     /* w1 communication */
  38 #define CN_W1_VAL                       0x1
  39 #define CN_IDX_V86D                     0x4
  40 #define CN_VAL_V86D_UVESAFB             0x1
  41
  42 #define CN_NETLINK_USERS                5
  43
  44 /*
  45  * Maximum connector's message size.
  46  */
  47 #define CONNECTOR_MAX_MSG_SIZE          16384
  48
  49 /*
  50  * idx and val are unique identifiers which
  51  * are used for message routing and
  52  * must be registered in connector.h for in-kernel usage.
  53  */
  54
  55 struct cb_id {
  56         __u32 idx;
  57         __u32 val;
  58 };
  59
  60 struct cn_msg {
  61         struct cb_id id;
  62
  63         __u32 seq;
  64         __u32 ack;
  65
  66         __u16 len;              /* Length of the following data */
  67         __u16 flags;
  68         __u8 data[0];
  69 };
  70
  71 /*
  72  * Notify structure - requests notification about
  73  * registering/unregistering idx/val in range [first, first+range].
  74  */
  75 struct cn_notify_req {
  76         __u32 first;
  77         __u32 range;
  78 };
  79
  80 /*
  81  * Main notification control message
  82  * *_notify_num         - number of appropriate cn_notify_req structures after
  83  *                              this struct.
  84  * group                - notification receiver's idx.
  85  * len                  - total length of the attached data.
  86  */
  87 struct cn_ctl_msg {
  88         __u32 idx_notify_num;
  89         __u32 val_notify_num;
  90         __u32 group;
  91         __u32 len;
  92         __u8 data[0];
  93 };
  94
  95 #ifdef __KERNEL__
  96
  97 #include <asm/atomic.h>
  98
  99 #include <linux/list.h>
 100 #include <linux/workqueue.h>
 101
 102 #include <net/sock.h>
 103
 104 #define CN_CBQ_NAMELEN          32
 105
 106 struct cn_queue_dev {
 107         atomic_t refcnt;
 108         unsigned char name[CN_CBQ_NAMELEN];
 109
 110         struct workqueue_struct *cn_queue;
 111
 112         struct list_head queue_list;
 113         spinlock_t queue_lock;
 114
 115         struct sock *nls;
 116 };
 117
 118 struct cn_callback_id {
 119         unsigned char name[CN_CBQ_NAMELEN];
 120         struct cb_id id;
 121 };
 122
 123 struct cn_callback_data {
 124         void (*destruct_data) (void *);
 125         void *ddata;
 126
 127         void *callback_priv;
 128         void (*callback) (void *);
 129
 130         void *free;
 131 };
 132
 133 struct cn_callback_entry {
 134         struct list_head callback_entry;
 135         struct work_struct work;
 136         struct cn_queue_dev *pdev;
 137
 138         struct cn_callback_id id;
 139         struct cn_callback_data data;
 140
 141         u32 seq, group;
 142 };
 143
 144 struct cn_ctl_entry {
 145         struct list_head notify_entry;
 146         struct cn_ctl_msg *msg;
 147 };
 148
 149 struct cn_dev {
 150         struct cb_id id;
 151
 152         u32 seq, groups;
 153         struct sock *nls;
 154         void (*input) (struct sk_buff *skb);
 155
 156         struct cn_queue_dev *cbdev;
 157 };
 158
 159 int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
 160 void cn_del_callback(struct cb_id *);
 161 int cn_netlink_send(struct cn_msg *, u32, gfp_t);
 162
 163 int cn_queue_add_callback(struct cn_queue_dev *dev, char *name, struct cb_id *id, void (*callback)(void *));
 164 void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
 165
 166 struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
 167 void cn_queue_free_dev(struct cn_queue_dev *dev);
 168
 169 int cn_cb_equal(struct cb_id *, struct cb_id *);
 170
 171 void cn_queue_wrapper(struct work_struct *work);
 172
 173 extern int cn_already_initialized;
 174
 175 #endif                          /* __KERNEL__ */
 176 #endif                          /* __CONNECTOR_H */