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dgrp_common.h
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1 /*
2  *
3  * Copyright 1999 Digi International (www.digi.com)
4  * James Puzzo <jamesp at digi dot com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2, or (at your option)
9  * any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
13  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
14  * PURPOSE. See the GNU General Public License for more details.
15  *
16  */
17 
18 #ifndef __DGRP_COMMON_H
19 #define __DGRP_COMMON_H
20 
21 #define DIGI_VERSION "1.9-29"
22 
23 #include <linux/fs.h>
24 #include <linux/timer.h>
25 #include "drp.h"
26 
27 #define DGRP_TTIME 100
28 #define DGRP_RTIME 100
29 
30 /************************************************************************
31  * All global storage allocation.
32  ************************************************************************/
33 
34 extern int dgrp_rawreadok; /* Allow raw writing of input */
35 extern int dgrp_register_cudevices; /* enable legacy cu devices */
36 extern int dgrp_register_prdevices; /* enable transparent print devices */
37 extern int dgrp_poll_tick; /* Poll interval - in ms */
38 
39 extern struct list_head nd_struct_list;
40 
43  struct timer_list timer;
44  int poll_tick;
45  ulong poll_round; /* Timer rouding factor */
47 };
48 
49 extern struct dgrp_poll_data dgrp_poll_data;
50 extern void dgrp_poll_handler(unsigned long arg);
51 
52 /* from dgrp_mon_ops.c */
53 extern void dgrp_register_mon_hook(struct proc_dir_entry *de);
54 
55 /* from dgrp_tty.c */
56 extern int dgrp_tty_init(struct nd_struct *nd);
57 extern void dgrp_tty_uninit(struct nd_struct *nd);
58 
59 /* from dgrp_ports_ops.c */
60 extern void dgrp_register_ports_hook(struct proc_dir_entry *de);
61 
62 /* from dgrp_net_ops.c */
63 extern void dgrp_register_net_hook(struct proc_dir_entry *de);
64 
65 /* from dgrp_dpa_ops.c */
66 extern void dgrp_register_dpa_hook(struct proc_dir_entry *de);
67 extern void dgrp_dpa_data(struct nd_struct *, int, u8 *, int);
68 
69 /* from dgrp_sysfs.c */
70 extern void dgrp_create_class_sysfs_files(void);
71 extern void dgrp_remove_class_sysfs_files(void);
72 
73 extern void dgrp_create_node_class_sysfs_files(struct nd_struct *nd);
74 extern void dgrp_remove_node_class_sysfs_files(struct nd_struct *nd);
75 
76 extern void dgrp_create_tty_sysfs(struct un_struct *un, struct device *c);
77 extern void dgrp_remove_tty_sysfs(struct device *c);
78 
79 /* from dgrp_specproc.c */
80 /*
81  * The list of DGRP entries with r/w capabilities. These
82  * magic numbers are used for identification purposes.
83  */
84 enum {
85  DGRP_CONFIG = 1, /* Configure portservers */
86  DGRP_NETDIR = 2, /* Directory for "net" devices */
87  DGRP_MONDIR = 3, /* Directory for "mon" devices */
88  DGRP_PORTSDIR = 4, /* Directory for "ports" devices */
89  DGRP_INFO = 5, /* Get info. about the running module */
90  DGRP_NODEINFO = 6, /* Get info. about the configured nodes */
91  DGRP_DPADIR = 7, /* Directory for the "dpa" devices */
92 };
93 
94 /*
95  * Directions for proc handlers
96  */
97 enum {
98  INBOUND = 1, /* Data being written to kernel */
99  OUTBOUND = 2, /* Data being read from the kernel */
100 };
101 
122  int id; /* Integer identifier */
123  const char *name; /* ASCII identifier */
124  mode_t mode; /* File access permissions */
125  struct dgrp_proc_entry *child; /* Child pointer */
126 
127  /* file ops to use, pass NULL to use default */
129 
130  struct proc_dir_entry *de; /* proc entry pointer */
131  struct semaphore excl_sem; /* Protects exclusive access var */
132  int excl_cnt; /* Counts number of curr accesses */
133 };
134 
135 extern void dgrp_unregister_proc(void);
136 extern void dgrp_register_proc(void);
137 
138 /*-----------------------------------------------------------------------*
139  *
140  * Declarations for common operations:
141  *
142  * (either used by more than one of net, mon, or tty,
143  * or in interrupt context (i.e. the poller))
144  *
145  *-----------------------------------------------------------------------*/
146 
147 void dgrp_carrier(struct ch_struct *ch);
148 extern int dgrp_inode_permission(struct inode *inode, int op);
149 extern int dgrp_chk_perm(int mode, int op);
150 
151 
152 /*
153  * ID manipulation macros (where c1 & c2 are characters, i is
154  * a long integer, and s is a character array of at least three members
155  */
156 
157 static inline void ID_TO_CHAR(long i, char *s)
158 {
159  s[0] = ((i & 0xff00)>>8);
160  s[1] = (i & 0xff);
161  s[2] = 0;
162 }
163 
164 static inline long CHAR_TO_ID(char *s)
165 {
166  return ((s[0] & 0xff) << 8) | (s[1] & 0xff);
167 }
168 
169 static inline struct nd_struct *nd_struct_get(long major)
170 {
171  struct nd_struct *nd;
172 
174  if (major == nd->nd_major)
175  return nd;
176  }
177 
178  return NULL;
179 }
180 
181 static inline int nd_struct_add(struct nd_struct *entry)
182 {
183  struct nd_struct *ptr;
184 
185  ptr = nd_struct_get(entry->nd_major);
186 
187  if (ptr)
188  return -EBUSY;
189 
190  list_add_tail(&entry->list, &nd_struct_list);
191 
192  return 0;
193 }
194 
195 static inline int nd_struct_del(struct nd_struct *entry)
196 {
197  struct nd_struct *nd;
198 
199  nd = nd_struct_get(entry->nd_major);
200 
201  if (!nd)
202  return -ENODEV;
203 
204  list_del(&nd->list);
205  return 0;
206 }
207 
208 #endif /* __DGRP_COMMON_H */