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/slab.h>
  19 #include <linux/init.h>
  20 #include "hisax.h"
  21
  22 #define FSM_TIMER_DEBUG 0
  23
  24 int
  25 FsmNew(struct Fsm *fsm, struct FsmNode *fnlist, int fncount)
  26 {
  27         int i;
  28
  29         fsm->jumpmatrix =
  30                 kzalloc(sizeof(FSMFNPTR) * fsm->state_count * fsm->event_count, GFP_KERNEL);
  31         if (!fsm->jumpmatrix)
  32                 return -ENOMEM;
  33
  34         for (i = 0; i < fncount; i++)
  35                 if ((fnlist[i].state >= fsm->state_count) || (fnlist[i].event >= fsm->event_count)) {
  36                         printk(KERN_ERR "FsmNew Error line %d st(%ld/%ld) ev(%ld/%ld)\n",
  37                                i, (long)fnlist[i].state, (long)fsm->state_count,
  38                                (long)fnlist[i].event, (long)fsm->event_count);
  39                 } else
  40                         fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
  41                                         fnlist[i].state] = (FSMFNPTR)fnlist[i].routine;
  42         return 0;
  43 }
  44
  45 void
  46 FsmFree(struct Fsm *fsm)
  47 {
  48         kfree((void *) fsm->jumpmatrix);
  49 }
  50
  51 int
  52 FsmEvent(struct FsmInst *fi, int event, void *arg)
  53 {
  54         FSMFNPTR r;
  55
  56         if ((fi->state >= fi->fsm->state_count) || (event >= fi->fsm->event_count)) {
  57                 printk(KERN_ERR "FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
  58                        (long)fi->state, (long)fi->fsm->state_count, event, (long)fi->fsm->event_count);
  59                 return (1);
  60         }
  61         r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
  62         if (r) {
  63                 if (fi->debug)
  64                         fi->printdebug(fi, "State %s Event %s",
  65                                        fi->fsm->strState[fi->state],
  66                                        fi->fsm->strEvent[event]);
  67                 r(fi, event, arg);
  68                 return (0);
  69         } else {
  70                 if (fi->debug)
  71                         fi->printdebug(fi, "State %s Event %s no routine",
  72                                        fi->fsm->strState[fi->state],
  73                                        fi->fsm->strEvent[event]);
  74                 return (!0);
  75         }
  76 }
  77
  78 void
  79 FsmChangeState(struct FsmInst *fi, int newstate)
  80 {
  81         fi->state = newstate;
  82         if (fi->debug)
  83                 fi->printdebug(fi, "ChangeState %s",
  84                                fi->fsm->strState[newstate]);
  85 }
  86
  87 static void
  88 FsmExpireTimer(struct timer_list *t)
  89 {
  90         struct FsmTimer *ft = from_timer(ft, t, tl);
  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 #if FSM_TIMER_DEBUG
 103         if (ft->fi->debug)
 104                 ft->fi->printdebug(ft->fi, "FsmInitTimer %lx", (long) ft);
 105 #endif
 106         timer_setup(&ft->tl, FsmExpireTimer, 0);
 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         ft->event = event;
 136         ft->arg = arg;
 137         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 138         add_timer(&ft->tl);
 139         return 0;
 140 }
 141
 142 void
 143 FsmRestartTimer(struct FsmTimer *ft,
 144                 int millisec, int event, void *arg, int where)
 145 {
 146
 147 #if FSM_TIMER_DEBUG
 148         if (ft->fi->debug)
 149                 ft->fi->printdebug(ft->fi, "FsmRestartTimer %lx %d %d",
 150                                    (long) ft, millisec, where);
 151 #endif
 152
 153         if (timer_pending(&ft->tl))
 154                 del_timer(&ft->tl);
 155         ft->event = event;
 156         ft->arg = arg;
 157         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 158         add_timer(&ft->tl);
 159 }