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1b2b03f8 KK |
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, | |
475be4d8 | 31 | struct FsmNode *fnlist, int fncount) |
1b2b03f8 KK |
32 | { |
33 | int i; | |
34 | ||
35 | fsm->jumpmatrix = kzalloc(sizeof(FSMFNPTR) * fsm->state_count * | |
475be4d8 | 36 | fsm->event_count, GFP_KERNEL); |
1b2b03f8 KK |
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 | |
475be4d8 JP |
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); | |
1b2b03f8 KK |
45 | } else |
46 | fsm->jumpmatrix[fsm->state_count * fnlist[i].event + | |
475be4d8 | 47 | fnlist[i].state] = (FSMFNPTR) fnlist[i].routine; |
1b2b03f8 KK |
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 | |
475be4d8 JP |
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); | |
1b2b03f8 KK |
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", | |
475be4d8 JP |
75 | fi->fsm->strState[fi->state], |
76 | fi->fsm->strEvent[event]); | |
1b2b03f8 KK |
77 | r(fi, event, arg); |
78 | return 0; | |
79 | } else { | |
80 | if (fi->debug) | |
81 | fi->printdebug(fi, "State %s Event %s no action", | |
475be4d8 JP |
82 | fi->fsm->strState[fi->state], |
83 | fi->fsm->strEvent[event]); | |
1b2b03f8 KK |
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", | |
475be4d8 | 95 | fi->fsm->strState[newstate]); |
1b2b03f8 KK |
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 | 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 | |
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", | |
475be4d8 | 129 | (long) ft, where); |
1b2b03f8 KK |
130 | #endif |
131 | del_timer(&ft->tl); | |
132 | } | |
133 | EXPORT_SYMBOL(mISDN_FsmDelTimer); | |
134 | ||
135 | int | |
136 | mISDN_FsmAddTimer(struct FsmTimer *ft, | |
475be4d8 | 137 | int millisec, int event, void *arg, int where) |
1b2b03f8 KK |
138 | { |
139 | ||
140 | #if FSM_TIMER_DEBUG | |
141 | if (ft->fi->debug) | |
142 | ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d", | |
475be4d8 | 143 | (long) ft, millisec, where); |
1b2b03f8 KK |
144 | #endif |
145 | ||
146 | if (timer_pending(&ft->tl)) { | |
147 | if (ft->fi->debug) { | |
148 | printk(KERN_WARNING | |
475be4d8 | 149 | "mISDN_FsmAddTimer: timer already active!\n"); |
1b2b03f8 | 150 | ft->fi->printdebug(ft->fi, |
475be4d8 | 151 | "mISDN_FsmAddTimer already active!"); |
1b2b03f8 KK |
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 | |
165 | mISDN_FsmRestartTimer(struct FsmTimer *ft, | |
475be4d8 | 166 | int millisec, int event, void *arg, int where) |
1b2b03f8 KK |
167 | { |
168 | ||
169 | #if FSM_TIMER_DEBUG | |
170 | if (ft->fi->debug) | |
171 | ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d", | |
475be4d8 | 172 | (long) ft, millisec, where); |
1b2b03f8 KK |
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); |