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
29 void
mISDN_FsmNew(struct Fsm * fsm,struct FsmNode * fnlist,int fncount)30 mISDN_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 }
49 EXPORT_SYMBOL(mISDN_FsmNew);
50
51 void
mISDN_FsmFree(struct Fsm * fsm)52 mISDN_FsmFree(struct Fsm *fsm)
53 {
54 kfree((void *) fsm->jumpmatrix);
55 }
56 EXPORT_SYMBOL(mISDN_FsmFree);
57
58 int
mISDN_FsmEvent(struct FsmInst * fi,int event,void * arg)59 mISDN_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 }
87 EXPORT_SYMBOL(mISDN_FsmEvent);
88
89 void
mISDN_FsmChangeState(struct FsmInst * fi,int newstate)90 mISDN_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 }
97 EXPORT_SYMBOL(mISDN_FsmChangeState);
98
99 static void
FsmExpireTimer(struct FsmTimer * ft)100 FsmExpireTimer(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
109 void
mISDN_FsmInitTimer(struct FsmInst * fi,struct FsmTimer * ft)110 mISDN_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 }
121 EXPORT_SYMBOL(mISDN_FsmInitTimer);
122
123 void
mISDN_FsmDelTimer(struct FsmTimer * ft,int where)124 mISDN_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 }
133 EXPORT_SYMBOL(mISDN_FsmDelTimer);
134
135 int
mISDN_FsmAddTimer(struct FsmTimer * ft,int millisec,int event,void * arg,int where)136 mISDN_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 }
162 EXPORT_SYMBOL(mISDN_FsmAddTimer);
163
164 void
mISDN_FsmRestartTimer(struct FsmTimer * ft,int millisec,int event,void * arg,int where)165 mISDN_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 }
183 EXPORT_SYMBOL(mISDN_FsmRestartTimer);
184