drivers/isdn/hisax/fsm.c

   1 /* $Id: fsm.c,v 1.14.6.4 2001/09/23 22:24:47 kai Exp $
   2  *
   3  * Finite state machine
   4  *
   5  * Author       Karsten Keil
   6  * Copyright    by Karsten Keil      <keil@isdn4linux.de>
   7  *              by Kai Germaschewski <kai.germaschewski@gmx.de>
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  * Thanks to    Jan den Ouden
  13  *              Fritz Elfert
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include "hisax.h"
  20
  21 #define FSM_TIMER_DEBUG 0
  22
  23 int
  24 FsmNew(struct Fsm *fsm, struct FsmNode *fnlist, int fncount)
  25 {
  26         int i;
  27
  28         fsm->jumpmatrix = (FSMFNPTR *)
  29                 kmalloc(sizeof (FSMFNPTR) * fsm->state_count * fsm->event_count, GFP_KERNEL);
  30         if (!fsm->jumpmatrix)
  31                 return -ENOMEM;
  32
  33         memset(fsm->jumpmatrix, 0, sizeof (FSMFNPTR) * fsm->state_count * fsm->event_count);
  34
  35         for (i = 0; i < fncount; i++)
  36                 if ((fnlist[i].state>=fsm->state_count) || (fnlist[i].event>=fsm->event_count)) {
  37                         printk(KERN_ERR "FsmNew Error line %d st(%ld/%ld) ev(%ld/%ld)\n",
  38                                 i,(long)fnlist[i].state,(long)fsm->state_count,
  39                                 (long)fnlist[i].event,(long)fsm->event_count);
  40                 } else
  41                         fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
  42                                 fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
  43         return 0;
  44 }
  45
  46 void
  47 FsmFree(struct Fsm *fsm)
  48 {
  49         kfree((void *) fsm->jumpmatrix);
  50 }
  51
  52 int
  53 FsmEvent(struct FsmInst *fi, int event, void *arg)
  54 {
  55         FSMFNPTR r;
  56
  57         if ((fi->state>=fi->fsm->state_count) || (event >= fi->fsm->event_count)) {
  58                 printk(KERN_ERR "FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
  59                         (long)fi->state,(long)fi->fsm->state_count,event,(long)fi->fsm->event_count);
  60                 return(1);
  61         }
  62         r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
  63         if (r) {
  64                 if (fi->debug)
  65                         fi->printdebug(fi, "State %s Event %s",
  66                                 fi->fsm->strState[fi->state],
  67                                 fi->fsm->strEvent[event]);
  68                 r(fi, event, arg);
  69                 return (0);
  70         } else {
  71                 if (fi->debug)
  72                         fi->printdebug(fi, "State %s Event %s no routine",
  73                                 fi->fsm->strState[fi->state],
  74                                 fi->fsm->strEvent[event]);
  75                 return (!0);
  76         }
  77 }
  78
  79 void
  80 FsmChangeState(struct FsmInst *fi, int newstate)
  81 {
  82         fi->state = newstate;
  83         if (fi->debug)
  84                 fi->printdebug(fi, "ChangeState %s",
  85                         fi->fsm->strState[newstate]);
  86 }
  87
  88 static void
  89 FsmExpireTimer(struct FsmTimer *ft)
  90 {
  91 #if FSM_TIMER_DEBUG
  92         if (ft->fi->debug)
  93                 ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
  94 #endif
  95         FsmEvent(ft->fi, ft->event, ft->arg);
  96 }
  97
  98 void
  99 FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
 100 {
 101         ft->fi = fi;
 102         ft->tl.function = (void *) FsmExpireTimer;
 103         ft->tl.data = (long) ft;
 104 #if FSM_TIMER_DEBUG
 105         if (ft->fi->debug)
 106                 ft->fi->printdebug(ft->fi, "FsmInitTimer %lx", (long) ft);
 107 #endif
 108         init_timer(&ft->tl);
 109 }
 110
 111 void
 112 FsmDelTimer(struct FsmTimer *ft, int where)
 113 {
 114 #if FSM_TIMER_DEBUG
 115         if (ft->fi->debug)
 116                 ft->fi->printdebug(ft->fi, "FsmDelTimer %lx %d", (long) ft, where);
 117 #endif
 118         del_timer(&ft->tl);
 119 }
 120
 121 int
 122 FsmAddTimer(struct FsmTimer *ft,
 123             int millisec, int event, void *arg, int where)
 124 {
 125
 126 #if FSM_TIMER_DEBUG
 127         if (ft->fi->debug)
 128                 ft->fi->printdebug(ft->fi, "FsmAddTimer %lx %d %d",
 129                         (long) ft, millisec, where);
 130 #endif
 131
 132         if (timer_pending(&ft->tl)) {
 133                 printk(KERN_WARNING "FsmAddTimer: timer already active!\n");
 134                 ft->fi->printdebug(ft->fi, "FsmAddTimer already active!");
 135                 return -1;
 136         }
 137         init_timer(&ft->tl);
 138         ft->event = event;
 139         ft->arg = arg;
 140         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 141         add_timer(&ft->tl);
 142         return 0;
 143 }
 144
 145 void
 146 FsmRestartTimer(struct FsmTimer *ft,
 147             int millisec, int event, void *arg, int where)
 148 {
 149
 150 #if FSM_TIMER_DEBUG
 151         if (ft->fi->debug)
 152                 ft->fi->printdebug(ft->fi, "FsmRestartTimer %lx %d %d",
 153                         (long) ft, millisec, where);
 154 #endif
 155
 156         if (timer_pending(&ft->tl))
 157                 del_timer(&ft->tl);
 158         init_timer(&ft->tl);
 159         ft->event = event;
 160         ft->arg = arg;
 161         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 162         add_timer(&ft->tl);
 163 }