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 FsmTimer *ft)
89{
90#if FSM_TIMER_DEBUG
91	if (ft->fi->debug)
92		ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
93#endif
94	FsmEvent(ft->fi, ft->event, ft->arg);
95}
96
97void
98FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
99{
100	ft->fi = fi;
101	ft->tl.function = (void *) FsmExpireTimer;
102	ft->tl.data = (long) ft;
103#if FSM_TIMER_DEBUG
104	if (ft->fi->debug)
105		ft->fi->printdebug(ft->fi, "FsmInitTimer %lx", (long) ft);
106#endif
107	init_timer(&ft->tl);
108}
109
110void
111FsmDelTimer(struct FsmTimer *ft, int where)
112{
113#if FSM_TIMER_DEBUG
114	if (ft->fi->debug)
115		ft->fi->printdebug(ft->fi, "FsmDelTimer %lx %d", (long) ft, where);
116#endif
117	del_timer(&ft->tl);
118}
119
120int
121FsmAddTimer(struct FsmTimer *ft,
122	    int millisec, int event, void *arg, int where)
123{
124
125#if FSM_TIMER_DEBUG
126	if (ft->fi->debug)
127		ft->fi->printdebug(ft->fi, "FsmAddTimer %lx %d %d",
128				   (long) ft, millisec, where);
129#endif
130
131	if (timer_pending(&ft->tl)) {
132		printk(KERN_WARNING "FsmAddTimer: timer already active!\n");
133		ft->fi->printdebug(ft->fi, "FsmAddTimer already active!");
134		return -1;
135	}
136	init_timer(&ft->tl);
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	init_timer(&ft->tl);
158	ft->event = event;
159	ft->arg = arg;
160	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
161	add_timer(&ft->tl);
162}
163