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(array3_size(sizeof(FSMFNPTR), fsm->state_count,
  31                                     fsm->event_count),
  32                         GFP_KERNEL);
  33         if (!fsm->jumpmatrix)
  34                 return -ENOMEM;
  35
  36         for (i = 0; i < fncount; i++)
  37                 if ((fnlist[i].state >= fsm->state_count) || (fnlist[i].event >= fsm->event_count)) {
  38                         printk(KERN_ERR "FsmNew Error line %d st(%ld/%ld) ev(%ld/%ld)\n",
  39                                i, (long)fnlist[i].state, (long)fsm->state_count,
  40                                (long)fnlist[i].event, (long)fsm->event_count);
  41                 } else
  42                         fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
  43                                         fnlist[i].state] = (FSMFNPTR)fnlist[i].routine;
  44         return 0;
  45 }
  46
  47 void
  48 FsmFree(struct Fsm *fsm)
  49 {
  50         kfree((void *) fsm->jumpmatrix);
  51 }
  52
  53 int
  54 FsmEvent(struct FsmInst *fi, int event, void *arg)
  55 {
  56         FSMFNPTR r;
  57
  58         if ((fi->state >= fi->fsm->state_count) || (event >= fi->fsm->event_count)) {
  59                 printk(KERN_ERR "FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
  60                        (long)fi->state, (long)fi->fsm->state_count, event, (long)fi->fsm->event_count);
  61                 return (1);
  62         }
  63         r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
  64         if (r) {
  65                 if (fi->debug)
  66                         fi->printdebug(fi, "State %s Event %s",
  67                                        fi->fsm->strState[fi->state],
  68                                        fi->fsm->strEvent[event]);
  69                 r(fi, event, arg);
  70                 return (0);
  71         } else {
  72                 if (fi->debug)
  73                         fi->printdebug(fi, "State %s Event %s no routine",
  74                                        fi->fsm->strState[fi->state],
  75                                        fi->fsm->strEvent[event]);
  76                 return (!0);
  77         }
  78 }
  79
  80 void
  81 FsmChangeState(struct FsmInst *fi, int newstate)
  82 {
  83         fi->state = newstate;
  84         if (fi->debug)
  85                 fi->printdebug(fi, "ChangeState %s",
  86                                fi->fsm->strState[newstate]);
  87 }
  88
  89 static void
  90 FsmExpireTimer(struct timer_list *t)
  91 {
  92         struct FsmTimer *ft = from_timer(ft, t, tl);
  93 #if FSM_TIMER_DEBUG
  94         if (ft->fi->debug)
  95                 ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
  96 #endif
  97         FsmEvent(ft->fi, ft->event, ft->arg);
  98 }
  99
 100 void
 101 FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
 102 {
 103         ft->fi = fi;
 104 #if FSM_TIMER_DEBUG
 105         if (ft->fi->debug)
 106                 ft->fi->printdebug(ft->fi, "FsmInitTimer %lx", (long) ft);
 107 #endif
 108         timer_setup(&ft->tl, FsmExpireTimer, 0);
 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         ft->event = event;
 138         ft->arg = arg;
 139         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
 140         add_timer(&ft->tl);
 141         return 0;
 142 }
 143
 144 void
 145 FsmRestartTimer(struct FsmTimer *ft,
 146                 int millisec, int event, void *arg, int where)
 147 {
 148
 149 #if FSM_TIMER_DEBUG
 150         if (ft->fi->debug)
 151                 ft->fi->printdebug(ft->fi, "FsmRestartTimer %lx %d %d",
 152                                    (long) ft, millisec, where);
 153 #endif
 154
 155         if (timer_pending(&ft->tl))
 156                 del_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 }