drivers/staging/dgrp/dgrp_common.h

   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_register_cudevices; /* enable legacy cu devices */
  35 extern int dgrp_register_prdevices; /* enable transparent print devices */
  36 extern int dgrp_poll_tick;          /* Poll interval - in ms */
  37
  38 extern struct list_head nd_struct_list;
  39
  40 struct dgrp_poll_data {
  41         spinlock_t poll_lock;
  42         struct timer_list timer;
  43         int poll_tick;
  44         ulong poll_round;       /* Timer rouding factor */
  45         long node_active_count;
  46 };
  47
  48 extern struct dgrp_poll_data dgrp_poll_data;
  49 extern void dgrp_poll_handler(unsigned long arg);
  50
  51 /* from dgrp_mon_ops.c */
  52 extern const struct file_operations dgrp_mon_ops;
  53
  54 /* from dgrp_tty.c */
  55 extern int dgrp_tty_init(struct nd_struct *nd);
  56 extern void dgrp_tty_uninit(struct nd_struct *nd);
  57
  58 /* from dgrp_ports_ops.c */
  59 extern const struct file_operations dgrp_ports_ops;
  60
  61 /* from dgrp_net_ops.c */
  62 extern const struct file_operations dgrp_net_ops;
  63
  64 /* from dgrp_dpa_ops.c */
  65 extern const struct file_operations dgrp_dpa_ops;
  66 extern void dgrp_dpa_data(struct nd_struct *, int, u8 *, int);
  67
  68 /* from dgrp_sysfs.c */
  69 extern int dgrp_create_class_sysfs_files(void);
  70 extern void dgrp_remove_class_sysfs_files(void);
  71
  72 extern void dgrp_create_node_class_sysfs_files(struct nd_struct *nd);
  73 extern void dgrp_remove_node_class_sysfs_files(struct nd_struct *nd);
  74
  75 extern void dgrp_create_tty_sysfs(struct un_struct *un, struct device *c);
  76 extern void dgrp_remove_tty_sysfs(struct device *c);
  77
  78 /* from dgrp_specproc.c */
  79 extern void dgrp_unregister_proc(void);
  80 extern void dgrp_register_proc(void);
  81
  82 /*-----------------------------------------------------------------------*
  83  *
  84  *  Declarations for common operations:
  85  *
  86  *      (either used by more than one of net, mon, or tty,
  87  *       or in interrupt context (i.e. the poller))
  88  *
  89  *-----------------------------------------------------------------------*/
  90
  91 void dgrp_carrier(struct ch_struct *ch);
  92
  93
  94 /*
  95  *  ID manipulation macros (where c1 & c2 are characters, i is
  96  *  a long integer, and s is a character array of at least three members
  97  */
  98
  99 static inline void ID_TO_CHAR(long i, char *s)
 100 {
 101         s[0] = ((i & 0xff00)>>8);
 102         s[1] = (i & 0xff);
 103         s[2] = 0;
 104 }
 105
 106 static inline long CHAR_TO_ID(char *s)
 107 {
 108         return ((s[0] & 0xff) << 8) | (s[1] & 0xff);
 109 }
 110
 111 static inline struct nd_struct *nd_struct_get(long major)
 112 {
 113         struct nd_struct *nd;
 114
 115         list_for_each_entry(nd, &nd_struct_list, list) {
 116                 if (major == nd->nd_major)
 117                         return nd;
 118         }
 119
 120         return NULL;
 121 }
 122
 123 static inline int nd_struct_add(struct nd_struct *entry)
 124 {
 125         struct nd_struct *ptr;
 126
 127         ptr = nd_struct_get(entry->nd_major);
 128
 129         if (ptr)
 130                 return -EBUSY;
 131
 132         list_add_tail(&entry->list, &nd_struct_list);
 133
 134         return 0;
 135 }
 136
 137 static inline int nd_struct_del(struct nd_struct *entry)
 138 {
 139         struct nd_struct *nd;
 140
 141         nd = nd_struct_get(entry->nd_major);
 142
 143         if (!nd)
 144                 return -ENODEV;
 145
 146         list_del(&nd->list);
 147         return 0;
 148 }
 149
 150 #endif /* __DGRP_COMMON_H */