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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 | ||
54a6a043 | 29 | int |
1b2b03f8 | 30 | mISDN_FsmNew(struct Fsm *fsm, |
475be4d8 | 31 | struct FsmNode *fnlist, int fncount) |
1b2b03f8 KK |
32 | { |
33 | int i; | |
34 | ||
6396bb22 KC |
35 | fsm->jumpmatrix = |
36 | kzalloc(array3_size(sizeof(FSMFNPTR), fsm->state_count, | |
37 | fsm->event_count), | |
38 | GFP_KERNEL); | |
54a6a043 AV |
39 | if (fsm->jumpmatrix == NULL) |
40 | return -ENOMEM; | |
1b2b03f8 KK |
41 | |
42 | for (i = 0; i < fncount; i++) | |
43 | if ((fnlist[i].state >= fsm->state_count) || | |
44 | (fnlist[i].event >= fsm->event_count)) { | |
45 | printk(KERN_ERR | |
475be4d8 JP |
46 | "mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n", |
47 | i, (long)fnlist[i].state, (long)fsm->state_count, | |
48 | (long)fnlist[i].event, (long)fsm->event_count); | |
1b2b03f8 KK |
49 | } else |
50 | fsm->jumpmatrix[fsm->state_count * fnlist[i].event + | |
475be4d8 | 51 | fnlist[i].state] = (FSMFNPTR) fnlist[i].routine; |
54a6a043 | 52 | return 0; |
1b2b03f8 KK |
53 | } |
54 | EXPORT_SYMBOL(mISDN_FsmNew); | |
55 | ||
56 | void | |
57 | mISDN_FsmFree(struct Fsm *fsm) | |
58 | { | |
59 | kfree((void *) fsm->jumpmatrix); | |
60 | } | |
61 | EXPORT_SYMBOL(mISDN_FsmFree); | |
62 | ||
63 | int | |
64 | mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg) | |
65 | { | |
66 | FSMFNPTR r; | |
67 | ||
68 | if ((fi->state >= fi->fsm->state_count) || | |
69 | (event >= fi->fsm->event_count)) { | |
70 | printk(KERN_ERR | |
475be4d8 JP |
71 | "mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n", |
72 | (long)fi->state, (long)fi->fsm->state_count, event, | |
73 | (long)fi->fsm->event_count); | |
1b2b03f8 KK |
74 | return 1; |
75 | } | |
76 | r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state]; | |
77 | if (r) { | |
78 | if (fi->debug) | |
79 | fi->printdebug(fi, "State %s Event %s", | |
475be4d8 JP |
80 | fi->fsm->strState[fi->state], |
81 | fi->fsm->strEvent[event]); | |
1b2b03f8 KK |
82 | r(fi, event, arg); |
83 | return 0; | |
84 | } else { | |
85 | if (fi->debug) | |
86 | fi->printdebug(fi, "State %s Event %s no action", | |
475be4d8 JP |
87 | fi->fsm->strState[fi->state], |
88 | fi->fsm->strEvent[event]); | |
1b2b03f8 KK |
89 | return 1; |
90 | } | |
91 | } | |
92 | EXPORT_SYMBOL(mISDN_FsmEvent); | |
93 | ||
94 | void | |
95 | mISDN_FsmChangeState(struct FsmInst *fi, int newstate) | |
96 | { | |
97 | fi->state = newstate; | |
98 | if (fi->debug) | |
99 | fi->printdebug(fi, "ChangeState %s", | |
475be4d8 | 100 | fi->fsm->strState[newstate]); |
1b2b03f8 KK |
101 | } |
102 | EXPORT_SYMBOL(mISDN_FsmChangeState); | |
103 | ||
104 | static void | |
e313ac12 | 105 | FsmExpireTimer(struct timer_list *t) |
1b2b03f8 | 106 | { |
e313ac12 | 107 | struct FsmTimer *ft = from_timer(ft, t, tl); |
1b2b03f8 KK |
108 | #if FSM_TIMER_DEBUG |
109 | if (ft->fi->debug) | |
110 | ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft); | |
111 | #endif | |
112 | mISDN_FsmEvent(ft->fi, ft->event, ft->arg); | |
113 | } | |
114 | ||
115 | void | |
116 | mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft) | |
117 | { | |
118 | ft->fi = fi; | |
1b2b03f8 KK |
119 | #if FSM_TIMER_DEBUG |
120 | if (ft->fi->debug) | |
121 | ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft); | |
122 | #endif | |
e313ac12 | 123 | timer_setup(&ft->tl, FsmExpireTimer, 0); |
1b2b03f8 KK |
124 | } |
125 | EXPORT_SYMBOL(mISDN_FsmInitTimer); | |
126 | ||
127 | void | |
128 | mISDN_FsmDelTimer(struct FsmTimer *ft, int where) | |
129 | { | |
130 | #if FSM_TIMER_DEBUG | |
131 | if (ft->fi->debug) | |
132 | ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d", | |
475be4d8 | 133 | (long) ft, where); |
1b2b03f8 KK |
134 | #endif |
135 | del_timer(&ft->tl); | |
136 | } | |
137 | EXPORT_SYMBOL(mISDN_FsmDelTimer); | |
138 | ||
139 | int | |
140 | mISDN_FsmAddTimer(struct FsmTimer *ft, | |
475be4d8 | 141 | int millisec, int event, void *arg, int where) |
1b2b03f8 KK |
142 | { |
143 | ||
144 | #if FSM_TIMER_DEBUG | |
145 | if (ft->fi->debug) | |
146 | ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d", | |
475be4d8 | 147 | (long) ft, millisec, where); |
1b2b03f8 KK |
148 | #endif |
149 | ||
150 | if (timer_pending(&ft->tl)) { | |
151 | if (ft->fi->debug) { | |
152 | printk(KERN_WARNING | |
475be4d8 | 153 | "mISDN_FsmAddTimer: timer already active!\n"); |
1b2b03f8 | 154 | ft->fi->printdebug(ft->fi, |
475be4d8 | 155 | "mISDN_FsmAddTimer already active!"); |
1b2b03f8 KK |
156 | } |
157 | return -1; | |
158 | } | |
1b2b03f8 KK |
159 | ft->event = event; |
160 | ft->arg = arg; | |
161 | ft->tl.expires = jiffies + (millisec * HZ) / 1000; | |
162 | add_timer(&ft->tl); | |
163 | return 0; | |
164 | } | |
165 | EXPORT_SYMBOL(mISDN_FsmAddTimer); | |
166 | ||
167 | void | |
168 | mISDN_FsmRestartTimer(struct FsmTimer *ft, | |
475be4d8 | 169 | int millisec, int event, void *arg, int where) |
1b2b03f8 KK |
170 | { |
171 | ||
172 | #if FSM_TIMER_DEBUG | |
173 | if (ft->fi->debug) | |
174 | ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d", | |
475be4d8 | 175 | (long) ft, millisec, where); |
1b2b03f8 KK |
176 | #endif |
177 | ||
178 | if (timer_pending(&ft->tl)) | |
179 | del_timer(&ft->tl); | |
1b2b03f8 KK |
180 | ft->event = event; |
181 | ft->arg = arg; | |
182 | ft->tl.expires = jiffies + (millisec * HZ) / 1000; | |
183 | add_timer(&ft->tl); | |
184 | } | |
185 | EXPORT_SYMBOL(mISDN_FsmRestartTimer); |