drivers/isdn/mISDN/fsm.c

   1 /*
   2  * finite state machine implementation
   3  *
   4  * Author       Karsten Keil <kkeil@novell.com>
   5  *
   6  * Thanks to    Jan den Ouden
   7  *              Fritz Elfert
   8  * Copyright 2008  by Karsten Keil <kkeil@novell.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/module.h>
  24 #include <linux/string.h>
  25 #include "fsm.h"
  26
  27 #define FSM_TIMER_DEBUG 0
  28
  29 void
  30 mISDN_FsmNew(struct Fsm *fsm,
  31              struct FsmNode *fnlist, int fncount)
  32 {
  33         int i;
  34
  35         fsm->jumpmatrix = kzalloc(sizeof(FSMFNPTR) * fsm->state_count *
  36                                   fsm->event_count, GFP_KERNEL);
  37
  38         for (i = 0; i < fncount; i++)
  39                 if ((fnlist[i].state >= fsm->state_count) ||
  40                     (fnlist[i].event >= fsm->event_count)) {
  41                         printk(KERN_ERR
  42                                "mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
  43                                i, (long)fnlist[i].state, (long)fsm->state_count,
  44                                (long)fnlist[i].event, (long)fsm->event_count);
  45                 } else
  46                         fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
  47                                         fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
  48 }
  49 EXPORT_SYMBOL(mISDN_FsmNew);
  50
  51 void
  52 mISDN_FsmFree(struct Fsm *fsm)
  53 {
  54         kfree((void *) fsm->jumpmatrix);
  55 }
  56 EXPORT_SYMBOL(mISDN_FsmFree);
  57
  58 int
  59 mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg)
  60 {
  61         FSMFNPTR r;
  62
  63         if ((fi->state >= fi->fsm->state_count) ||
  64             (event >= fi->fsm->event_count)) {
  65                 printk(KERN_ERR
  66                        "mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
  67                        (long)fi->state, (long)fi->fsm->state_count, event,
  68                        (long)fi->fsm->event_count);
  69                 return 1;
  70         }
  71         r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
  72         if (r) {
  73                 if (fi->debug)
  74                         fi->printdebug(fi, "State %s Event %s",
  75                                        fi->fsm->strState[fi->state],
  76                                        fi->fsm->strEvent[event]);
  77                 r(fi, event, arg);
  78                 return 0;
  79         } else {
  80                 if (fi->debug)
  81                         fi->printdebug(fi, "State %s Event %s no action",
  82                                        fi->fsm->strState[fi->state],
  83                                        fi->fsm->strEvent[event]);
  84                 return 1;
  85         }
  86 }
  87 EXPORT_SYMBOL(mISDN_FsmEvent);
  88
  89 void
  90 mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
  91 {
  92         fi->state = newstate;
  93         if (fi->debug)
  94                 fi->printdebug(fi, "ChangeState %s",
  95                                fi->fsm->strState[newstate]);
  96 }
  97 EXPORT_SYMBOL(mISDN_FsmChangeState);
  98
  99 static void
 100 FsmExpireTimer(struct FsmTimer *ft)
 101 {
 102 #if FSM_TIMER_DEBUG
 103         if (ft->fi->debug)
 104                 ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
 105 #endif
 106         mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
 107 }
 108
 109 void
 110 mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
 111 {
 112         ft->fi = fi;
 113         ft->tl.function = (void *) FsmExpireTimer;
 114         ft->tl.data = (long) ft;
 115 #if FSM_TIMER_DEBUG
 116         if (ft->fi->debug)
 117                 ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
 118 #endif
 119         init_timer(&ft->tl);
 120 }
 121 EXPORT_SYMBOL(mISDN_FsmInitTimer);
 122
 123 void
 124 mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
 125 {
 126 #if FSM_TIMER_DEBUG
 127         if (ft->fi->debug)
 128                 ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
 129                                    (long) ft, where);
 130 #endif
 131         del_timer(&ft->tl);
 132 }
 133 EXPORT_SYMBOL(mISDN_FsmDelTimer);
 134
 135 int
 136 mISDN_FsmAddTimer(struct FsmTimer *ft,
 137                   int millisec, int event, void *arg, int where)
 138 {
 139
 140 #if FSM_TIMER_DEBUG
 141         if (ft->fi->debug)
 142                 ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
 143                                    (long) ft, millisec, where);
 144 #endif
 145
 146         if (timer_pending(&ft->tl)) {
 147                 if (ft->fi->debug) {
 148                         printk(KERN_WARNING
 149                                "mISDN_FsmAddTimer: timer already active!\n");
 150                         ft->fi->printdebug(ft->fi,
 151                                            "mISDN_FsmAddTimer already active!");
 152                 }
 153                 return -1;
 154         }
 155         init_timer(&ft->tl);
 156         ft->event = event;
 157         ft->arg = arg;
 158         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 159         add_timer(&ft->tl);
 160         return 0;
 161 }
 162 EXPORT_SYMBOL(mISDN_FsmAddTimer);
 163
 164 void
 165 mISDN_FsmRestartTimer(struct FsmTimer *ft,
 166                       int millisec, int event, void *arg, int where)
 167 {
 168
 169 #if FSM_TIMER_DEBUG
 170         if (ft->fi->debug)
 171                 ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
 172                                    (long) ft, millisec, where);
 173 #endif
 174
 175         if (timer_pending(&ft->tl))
 176                 del_timer(&ft->tl);
 177         init_timer(&ft->tl);
 178         ft->event = event;
 179         ft->arg = arg;
 180         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 181         add_timer(&ft->tl);
 182 }
 183 EXPORT_SYMBOL(mISDN_FsmRestartTimer);