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183 lines
4.3 KiB
C
183 lines
4.3 KiB
C
/*
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* finite state machine implementation
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*
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* Author Karsten Keil <kkeil@novell.com>
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*
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* Thanks to Jan den Ouden
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* Fritz Elfert
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* Copyright 2008 by Karsten Keil <kkeil@novell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include "fsm.h"
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#define FSM_TIMER_DEBUG 0
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void
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mISDN_FsmNew(struct Fsm *fsm,
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struct FsmNode *fnlist, int fncount)
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{
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int i;
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fsm->jumpmatrix = kzalloc(sizeof(FSMFNPTR) * fsm->state_count *
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fsm->event_count, GFP_KERNEL);
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for (i = 0; i < fncount; i++)
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if ((fnlist[i].state >= fsm->state_count) ||
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(fnlist[i].event >= fsm->event_count)) {
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printk(KERN_ERR
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"mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
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i, (long)fnlist[i].state, (long)fsm->state_count,
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(long)fnlist[i].event, (long)fsm->event_count);
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} else
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fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
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fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
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}
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EXPORT_SYMBOL(mISDN_FsmNew);
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void
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mISDN_FsmFree(struct Fsm *fsm)
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{
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kfree((void *) fsm->jumpmatrix);
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}
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EXPORT_SYMBOL(mISDN_FsmFree);
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int
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mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg)
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{
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FSMFNPTR r;
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if ((fi->state >= fi->fsm->state_count) ||
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(event >= fi->fsm->event_count)) {
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printk(KERN_ERR
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"mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
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(long)fi->state, (long)fi->fsm->state_count, event,
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(long)fi->fsm->event_count);
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return 1;
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}
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r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
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if (r) {
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if (fi->debug)
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fi->printdebug(fi, "State %s Event %s",
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fi->fsm->strState[fi->state],
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fi->fsm->strEvent[event]);
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r(fi, event, arg);
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return 0;
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} else {
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if (fi->debug)
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fi->printdebug(fi, "State %s Event %s no action",
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fi->fsm->strState[fi->state],
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fi->fsm->strEvent[event]);
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return 1;
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}
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}
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EXPORT_SYMBOL(mISDN_FsmEvent);
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void
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mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
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{
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fi->state = newstate;
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if (fi->debug)
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fi->printdebug(fi, "ChangeState %s",
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fi->fsm->strState[newstate]);
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}
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EXPORT_SYMBOL(mISDN_FsmChangeState);
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static void
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FsmExpireTimer(struct FsmTimer *ft)
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{
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#if FSM_TIMER_DEBUG
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if (ft->fi->debug)
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ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
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#endif
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mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
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}
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void
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mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
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{
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ft->fi = fi;
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ft->tl.function = (void *) FsmExpireTimer;
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ft->tl.data = (long) ft;
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#if FSM_TIMER_DEBUG
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if (ft->fi->debug)
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ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
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#endif
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init_timer(&ft->tl);
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}
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EXPORT_SYMBOL(mISDN_FsmInitTimer);
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void
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mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
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{
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#if FSM_TIMER_DEBUG
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if (ft->fi->debug)
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ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
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(long) ft, where);
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#endif
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del_timer(&ft->tl);
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}
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EXPORT_SYMBOL(mISDN_FsmDelTimer);
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int
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mISDN_FsmAddTimer(struct FsmTimer *ft,
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int millisec, int event, void *arg, int where)
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{
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#if FSM_TIMER_DEBUG
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if (ft->fi->debug)
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ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
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(long) ft, millisec, where);
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#endif
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if (timer_pending(&ft->tl)) {
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if (ft->fi->debug) {
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printk(KERN_WARNING
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"mISDN_FsmAddTimer: timer already active!\n");
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ft->fi->printdebug(ft->fi,
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"mISDN_FsmAddTimer already active!");
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}
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return -1;
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}
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init_timer(&ft->tl);
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ft->event = event;
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ft->arg = arg;
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ft->tl.expires = jiffies + (millisec * HZ) / 1000;
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add_timer(&ft->tl);
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return 0;
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}
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EXPORT_SYMBOL(mISDN_FsmAddTimer);
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void
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mISDN_FsmRestartTimer(struct FsmTimer *ft,
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int millisec, int event, void *arg, int where)
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{
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#if FSM_TIMER_DEBUG
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if (ft->fi->debug)
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ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
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(long) ft, millisec, where);
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#endif
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if (timer_pending(&ft->tl))
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del_timer(&ft->tl);
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init_timer(&ft->tl);
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ft->event = event;
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ft->arg = arg;
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ft->tl.expires = jiffies + (millisec * HZ) / 1000;
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add_timer(&ft->tl);
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}
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EXPORT_SYMBOL(mISDN_FsmRestartTimer);
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