1/*
2 * finite state machine implementation
3 *
4 * Author       Karsten Keil <kkeil@novell.com>
5 *
6 * Thanks to    Jan den Ouden
7 *              Fritz Elfert
8 * Copyright 2008  by Karsten Keil <kkeil@novell.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU General Public License for more details.
18 *
19 */
20
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/module.h>
24#include <linux/string.h>
25#include "fsm.h"
26
27#define FSM_TIMER_DEBUG 0
28
29void
30mISDN_FsmNew(struct Fsm *fsm,
31	     struct FsmNode *fnlist, int fncount)
32{
33	int i;
34
35	fsm->jumpmatrix = kzalloc(sizeof(FSMFNPTR) * fsm->state_count *
36				  fsm->event_count, GFP_KERNEL);
37
38	for (i = 0; i < fncount; i++)
39		if ((fnlist[i].state >= fsm->state_count) ||
40		    (fnlist[i].event >= fsm->event_count)) {
41			printk(KERN_ERR
42			       "mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
43			       i, (long)fnlist[i].state, (long)fsm->state_count,
44			       (long)fnlist[i].event, (long)fsm->event_count);
45		} else
46			fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
47					fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
48}
49EXPORT_SYMBOL(mISDN_FsmNew);
50
51void
52mISDN_FsmFree(struct Fsm *fsm)
53{
54	kfree((void *) fsm->jumpmatrix);
55}
56EXPORT_SYMBOL(mISDN_FsmFree);
57
58int
59mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg)
60{
61	FSMFNPTR r;
62
63	if ((fi->state >= fi->fsm->state_count) ||
64	    (event >= fi->fsm->event_count)) {
65		printk(KERN_ERR
66		       "mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
67		       (long)fi->state, (long)fi->fsm->state_count, event,
68		       (long)fi->fsm->event_count);
69		return 1;
70	}
71	r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
72	if (r) {
73		if (fi->debug)
74			fi->printdebug(fi, "State %s Event %s",
75				       fi->fsm->strState[fi->state],
76				       fi->fsm->strEvent[event]);
77		r(fi, event, arg);
78		return 0;
79	} else {
80		if (fi->debug)
81			fi->printdebug(fi, "State %s Event %s no action",
82				       fi->fsm->strState[fi->state],
83				       fi->fsm->strEvent[event]);
84		return 1;
85	}
86}
87EXPORT_SYMBOL(mISDN_FsmEvent);
88
89void
90mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
91{
92	fi->state = newstate;
93	if (fi->debug)
94		fi->printdebug(fi, "ChangeState %s",
95			       fi->fsm->strState[newstate]);
96}
97EXPORT_SYMBOL(mISDN_FsmChangeState);
98
99static void
100FsmExpireTimer(struct FsmTimer *ft)
101{
102#if FSM_TIMER_DEBUG
103	if (ft->fi->debug)
104		ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
105#endif
106	mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
107}
108
109void
110mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
111{
112	ft->fi = fi;
113	ft->tl.function = (void *) FsmExpireTimer;
114	ft->tl.data = (long) ft;
115#if FSM_TIMER_DEBUG
116	if (ft->fi->debug)
117		ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
118#endif
119	init_timer(&ft->tl);
120}
121EXPORT_SYMBOL(mISDN_FsmInitTimer);
122
123void
124mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
125{
126#if FSM_TIMER_DEBUG
127	if (ft->fi->debug)
128		ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
129				   (long) ft, where);
130#endif
131	del_timer(&ft->tl);
132}
133EXPORT_SYMBOL(mISDN_FsmDelTimer);
134
135int
136mISDN_FsmAddTimer(struct FsmTimer *ft,
137		  int millisec, int event, void *arg, int where)
138{
139
140#if FSM_TIMER_DEBUG
141	if (ft->fi->debug)
142		ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
143				   (long) ft, millisec, where);
144#endif
145
146	if (timer_pending(&ft->tl)) {
147		if (ft->fi->debug) {
148			printk(KERN_WARNING
149			       "mISDN_FsmAddTimer: timer already active!\n");
150			ft->fi->printdebug(ft->fi,
151					   "mISDN_FsmAddTimer already active!");
152		}
153		return -1;
154	}
155	init_timer(&ft->tl);
156	ft->event = event;
157	ft->arg = arg;
158	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
159	add_timer(&ft->tl);
160	return 0;
161}
162EXPORT_SYMBOL(mISDN_FsmAddTimer);
163
164void
165mISDN_FsmRestartTimer(struct FsmTimer *ft,
166		      int millisec, int event, void *arg, int where)
167{
168
169#if FSM_TIMER_DEBUG
170	if (ft->fi->debug)
171		ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
172				   (long) ft, millisec, where);
173#endif
174
175	if (timer_pending(&ft->tl))
176		del_timer(&ft->tl);
177	init_timer(&ft->tl);
178	ft->event = event;
179	ft->arg = arg;
180	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
181	add_timer(&ft->tl);
182}
183EXPORT_SYMBOL(mISDN_FsmRestartTimer);
184