fsm.c

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/* $Id: fsm.c,v 1.14.6.4 2001/09/23 22:24:47 kai Exp $
 *
 * Finite state machine
 *
 * Author       Karsten Keil
 * Copyright    by Karsten Keil      <[email protected]>
 *              by Kai Germaschewski <[email protected]>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * Thanks to    Jan den Ouden
 *              Fritz Elfert
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include "hisax.h"

#define FSM_TIMER_DEBUG 0

int
FsmNew(struct Fsm *fsm, struct FsmNode *fnlist, int fncount)
{
    int i;

    fsm->jumpmatrix = (FSMFNPTR *)
        kzalloc(sizeof(FSMFNPTR) * fsm->state_count * fsm->event_count, GFP_KERNEL);
    if (!fsm->jumpmatrix)
        return -ENOMEM;

    for (i = 0; i < fncount; i++)
        if ((fnlist[i].state >= fsm->state_count) || (fnlist[i].event >= fsm->event_count)) {
            printk(KERN_ERR "FsmNew Error line %d st(%ld/%ld) ev(%ld/%ld)\n",
                   i, (long)fnlist[i].state, (long)fsm->state_count,
                   (long)fnlist[i].event, (long)fsm->event_count);
        } else
            fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
                    fnlist[i].state] = (FSMFNPTR)fnlist[i].routine;
    return 0;
}

void
FsmFree(struct Fsm *fsm)
{
    kfree((void *) fsm->jumpmatrix);
}

int
FsmEvent(struct FsmInst *fi, int event, void *arg)
{
    FSMFNPTR r;

    if ((fi->state >= fi->fsm->state_count) || (event >= fi->fsm->event_count)) {
        printk(KERN_ERR "FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
               (long)fi->state, (long)fi->fsm->state_count, event, (long)fi->fsm->event_count);
        return (1);
    }
    r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
    if (r) {
        if (fi->debug)
            fi->printdebug(fi, "State %s Event %s",
                       fi->fsm->strState[fi->state],
                       fi->fsm->strEvent[event]);
        r(fi, event, arg);
        return (0);
    } else {
        if (fi->debug)
            fi->printdebug(fi, "State %s Event %s no routine",
                       fi->fsm->strState[fi->state],
                       fi->fsm->strEvent[event]);
        return (!0);
    }
}

void
FsmChangeState(struct FsmInst *fi, int newstate)
{
    fi->state = newstate;
    if (fi->debug)
        fi->printdebug(fi, "ChangeState %s",
                   fi->fsm->strState[newstate]);
}

static void
FsmExpireTimer(struct FsmTimer *ft)
{
#if FSM_TIMER_DEBUG
    if (ft->fi->debug)
        ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
#endif
    FsmEvent(ft->fi, ft->event, ft->arg);
}

void
FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
{
    ft->fi = fi;
    ft->tl.function = (void *) FsmExpireTimer;
    ft->tl.data = (long) ft;
#if FSM_TIMER_DEBUG
    if (ft->fi->debug)
        ft->fi->printdebug(ft->fi, "FsmInitTimer %lx", (long) ft);
#endif
    init_timer(&ft->tl);
}

void
FsmDelTimer(struct FsmTimer *ft, int where)
{
#if FSM_TIMER_DEBUG
    if (ft->fi->debug)
        ft->fi->printdebug(ft->fi, "FsmDelTimer %lx %d", (long) ft, where);
#endif
    del_timer(&ft->tl);
}

int
FsmAddTimer(struct FsmTimer *ft,
        int millisec, int event, void *arg, int where)
{

#if FSM_TIMER_DEBUG
    if (ft->fi->debug)
        ft->fi->printdebug(ft->fi, "FsmAddTimer %lx %d %d",
                   (long) ft, millisec, where);
#endif

    if (timer_pending(&ft->tl)) {
        printk(KERN_WARNING "FsmAddTimer: timer already active!\n");
        ft->fi->printdebug(ft->fi, "FsmAddTimer already active!");
        return -1;
    }
    init_timer(&ft->tl);
    ft->event = event;
    ft->arg = arg;
    ft->tl.expires = jiffies + (millisec * HZ) / 1000;
    add_timer(&ft->tl);
    return 0;
}

void
FsmRestartTimer(struct FsmTimer *ft,
        int millisec, int event, void *arg, int where)
{

#if FSM_TIMER_DEBUG
    if (ft->fi->debug)
        ft->fi->printdebug(ft->fi, "FsmRestartTimer %lx %d %d",
                   (long) ft, millisec, where);
#endif

    if (timer_pending(&ft->tl))
        del_timer(&ft->tl);
    init_timer(&ft->tl);
    ft->event = event;
    ft->arg = arg;
    ft->tl.expires = jiffies + (millisec * HZ) / 1000;
    add_timer(&ft->tl);
}