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                 kzalloc(sizeof (FSMFNPTR) * fsm->state_count * fsm->event_count, GFP_KERNEL);
  30         if (!fsm->jumpmatrix)
  31                 return -ENOMEM;
  32
  33         for (i = 0; i < fncount; i++)
  34                 if ((fnlist[i].state>=fsm->state_count) || (fnlist[i].event>=fsm->event_count)) {
  35                         printk(KERN_ERR "FsmNew Error line %d st(%ld/%ld) ev(%ld/%ld)\n",
  36                                 i,(long)fnlist[i].state,(long)fsm->state_count,
  37                                 (long)fnlist[i].event,(long)fsm->event_count);
  38                 } else
  39                         fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
  40                                 fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
  41         return 0;
  42 }
  43
  44 void
  45 FsmFree(struct Fsm *fsm)
  46 {
  47         kfree((void *) fsm->jumpmatrix);
  48 }
  49
  50 int
  51 FsmEvent(struct FsmInst *fi, int event, void *arg)
  52 {
  53         FSMFNPTR r;
  54
  55         if ((fi->state>=fi->fsm->state_count) || (event >= fi->fsm->event_count)) {
  56                 printk(KERN_ERR "FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
  57                         (long)fi->state,(long)fi->fsm->state_count,event,(long)fi->fsm->event_count);
  58                 return(1);
  59         }
  60         r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
  61         if (r) {
  62                 if (fi->debug)
  63                         fi->printdebug(fi, "State %s Event %s",
  64                                 fi->fsm->strState[fi->state],
  65                                 fi->fsm->strEvent[event]);
  66                 r(fi, event, arg);
  67                 return (0);
  68         } else {
  69                 if (fi->debug)
  70                         fi->printdebug(fi, "State %s Event %s no routine",
  71                                 fi->fsm->strState[fi->state],
  72                                 fi->fsm->strEvent[event]);
  73                 return (!0);
  74         }
  75 }
  76
  77 void
  78 FsmChangeState(struct FsmInst *fi, int newstate)
  79 {
  80         fi->state = newstate;
  81         if (fi->debug)
  82                 fi->printdebug(fi, "ChangeState %s",
  83                         fi->fsm->strState[newstate]);
  84 }
  85
  86 static void
  87 FsmExpireTimer(struct FsmTimer *ft)
  88 {
  89 #if FSM_TIMER_DEBUG
  90         if (ft->fi->debug)
  91                 ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
  92 #endif
  93         FsmEvent(ft->fi, ft->event, ft->arg);
  94 }
  95
  96 void
  97 FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
  98 {
  99         ft->fi = fi;
 100         ft->tl.function = (void *) FsmExpireTimer;
 101         ft->tl.data = (long) ft;
 102 #if FSM_TIMER_DEBUG
 103         if (ft->fi->debug)
 104                 ft->fi->printdebug(ft->fi, "FsmInitTimer %lx", (long) ft);
 105 #endif
 106         init_timer(&ft->tl);
 107 }
 108
 109 void
 110 FsmDelTimer(struct FsmTimer *ft, int where)
 111 {
 112 #if FSM_TIMER_DEBUG
 113         if (ft->fi->debug)
 114                 ft->fi->printdebug(ft->fi, "FsmDelTimer %lx %d", (long) ft, where);
 115 #endif
 116         del_timer(&ft->tl);
 117 }
 118
 119 int
 120 FsmAddTimer(struct FsmTimer *ft,
 121             int millisec, int event, void *arg, int where)
 122 {
 123
 124 #if FSM_TIMER_DEBUG
 125         if (ft->fi->debug)
 126                 ft->fi->printdebug(ft->fi, "FsmAddTimer %lx %d %d",
 127                         (long) ft, millisec, where);
 128 #endif
 129
 130         if (timer_pending(&ft->tl)) {
 131                 printk(KERN_WARNING "FsmAddTimer: timer already active!\n");
 132                 ft->fi->printdebug(ft->fi, "FsmAddTimer already active!");
 133                 return -1;
 134         }
 135         init_timer(&ft->tl);
 136         ft->event = event;
 137         ft->arg = arg;
 138         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 139         add_timer(&ft->tl);
 140         return 0;
 141 }
 142
 143 void
 144 FsmRestartTimer(struct FsmTimer *ft,
 145             int millisec, int event, void *arg, int where)
 146 {
 147
 148 #if FSM_TIMER_DEBUG
 149         if (ft->fi->debug)
 150                 ft->fi->printdebug(ft->fi, "FsmRestartTimer %lx %d %d",
 151                         (long) ft, millisec, where);
 152 #endif
 153
 154         if (timer_pending(&ft->tl))
 155                 del_timer(&ft->tl);
 156         init_timer(&ft->tl);
 157         ft->event = event;
 158         ft->arg = arg;
 159         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 160         add_timer(&ft->tl);
 161 }