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/slab.h>
  19#include <linux/init.h>
  20#include "hisax.h"
  21
  22#define FSM_TIMER_DEBUG 0
  23
  24int
  25FsmNew(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
  45void
  46FsmFree(struct Fsm *fsm)
  47{
  48        kfree((void *) fsm->jumpmatrix);
  49}
  50
  51int
  52FsmEvent(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
  78void
  79FsmChangeState(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
  87static void
  88FsmExpireTimer(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
  98void
  99FsmInitTimer(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
 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        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
 142void
 143FsmRestartTimer(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}
 160