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x86: Constify attribute_group structures
[karo-tx-linux.git] / drivers / isdn / mISDN / fsm.c
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
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
52 mISDN_FsmFree(struct Fsm *fsm)
53 {
54         kfree((void *) fsm->jumpmatrix);
55 }
56 EXPORT_SYMBOL(mISDN_FsmFree);
57
58 int
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
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
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
110 mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
111 {
112         ft->fi = fi;
113 #if FSM_TIMER_DEBUG
114         if (ft->fi->debug)
115                 ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
116 #endif
117         setup_timer(&ft->tl, (void *)FsmExpireTimer, (long)ft);
118 }
119 EXPORT_SYMBOL(mISDN_FsmInitTimer);
120
121 void
122 mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
123 {
124 #if FSM_TIMER_DEBUG
125         if (ft->fi->debug)
126                 ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
127                                    (long) ft, where);
128 #endif
129         del_timer(&ft->tl);
130 }
131 EXPORT_SYMBOL(mISDN_FsmDelTimer);
132
133 int
134 mISDN_FsmAddTimer(struct FsmTimer *ft,
135                   int millisec, int event, void *arg, int where)
136 {
137
138 #if FSM_TIMER_DEBUG
139         if (ft->fi->debug)
140                 ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
141                                    (long) ft, millisec, where);
142 #endif
143
144         if (timer_pending(&ft->tl)) {
145                 if (ft->fi->debug) {
146                         printk(KERN_WARNING
147                                "mISDN_FsmAddTimer: timer already active!\n");
148                         ft->fi->printdebug(ft->fi,
149                                            "mISDN_FsmAddTimer already active!");
150                 }
151                 return -1;
152         }
153         init_timer(&ft->tl);
154         ft->event = event;
155         ft->arg = arg;
156         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
157         add_timer(&ft->tl);
158         return 0;
159 }
160 EXPORT_SYMBOL(mISDN_FsmAddTimer);
161
162 void
163 mISDN_FsmRestartTimer(struct FsmTimer *ft,
164                       int millisec, int event, void *arg, int where)
165 {
166
167 #if FSM_TIMER_DEBUG
168         if (ft->fi->debug)
169                 ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
170                                    (long) ft, millisec, where);
171 #endif
172
173         if (timer_pending(&ft->tl))
174                 del_timer(&ft->tl);
175         init_timer(&ft->tl);
176         ft->event = event;
177         ft->arg = arg;
178         ft->tl.expires = jiffies + (millisec * HZ) / 1000;
179         add_timer(&ft->tl);
180 }
181 EXPORT_SYMBOL(mISDN_FsmRestartTimer);