LXR linux/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
  23int
  24FsmNew(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
  44void
  45FsmFree(struct Fsm *fsm)
  46{
  47        kfree((void *) fsm->jumpmatrix);
  48}
  49
  50int
  51FsmEvent(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
  77void
  78FsmChangeState(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
  86static void
  87FsmExpireTimer(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
  96void
  97FsmInitTimer(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
 109void
 110FsmDelTimer(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
 119int
 120FsmAddTimer(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
 143void
 144FsmRestartTimer(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}
 162