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(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
  47void
  48FsmFree(struct Fsm *fsm)
  49{
  50        kfree((void *) fsm->jumpmatrix);
  51}
  52
  53int
  54FsmEvent(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
  80void
  81FsmChangeState(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
  89static void
  90FsmExpireTimer(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
 100void
 101FsmInitTimer(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
 111void
 112FsmDelTimer(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
 121int
 122FsmAddTimer(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
 144void
 145FsmRestartTimer(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}
 162