1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * finite state machine implementation
4 *
5 * Author Karsten Keil <kkeil@novell.com>
6 *
7 * Thanks to Jan den Ouden
8 * Fritz Elfert
9 * Copyright 2008 by Karsten Keil <kkeil@novell.com>
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/string.h>
16 #include "fsm.h"
17
18 #define FSM_TIMER_DEBUG 0
19
20 int
mISDN_FsmNew(struct Fsm * fsm,struct FsmNode * fnlist,int fncount)21 mISDN_FsmNew(struct Fsm *fsm,
22 struct FsmNode *fnlist, int fncount)
23 {
24 int i;
25
26 fsm->jumpmatrix =
27 kzalloc(array3_size(sizeof(FSMFNPTR), fsm->state_count,
28 fsm->event_count),
29 GFP_KERNEL);
30 if (fsm->jumpmatrix == NULL)
31 return -ENOMEM;
32
33 for (i = 0; i < fncount; i++)
34 if ((fnlist[i].state >= fsm->state_count) ||
35 (fnlist[i].event >= fsm->event_count)) {
36 printk(KERN_ERR
37 "mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
38 i, (long)fnlist[i].state, (long)fsm->state_count,
39 (long)fnlist[i].event, (long)fsm->event_count);
40 } else
41 fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
42 fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
43 return 0;
44 }
45 EXPORT_SYMBOL(mISDN_FsmNew);
46
47 void
mISDN_FsmFree(struct Fsm * fsm)48 mISDN_FsmFree(struct Fsm *fsm)
49 {
50 kfree((void *) fsm->jumpmatrix);
51 }
52 EXPORT_SYMBOL(mISDN_FsmFree);
53
54 int
mISDN_FsmEvent(struct FsmInst * fi,int event,void * arg)55 mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg)
56 {
57 FSMFNPTR r;
58
59 if ((fi->state >= fi->fsm->state_count) ||
60 (event >= fi->fsm->event_count)) {
61 printk(KERN_ERR
62 "mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
63 (long)fi->state, (long)fi->fsm->state_count, event,
64 (long)fi->fsm->event_count);
65 return 1;
66 }
67 r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
68 if (r) {
69 if (fi->debug)
70 fi->printdebug(fi, "State %s Event %s",
71 fi->fsm->strState[fi->state],
72 fi->fsm->strEvent[event]);
73 r(fi, event, arg);
74 return 0;
75 } else {
76 if (fi->debug)
77 fi->printdebug(fi, "State %s Event %s no action",
78 fi->fsm->strState[fi->state],
79 fi->fsm->strEvent[event]);
80 return 1;
81 }
82 }
83 EXPORT_SYMBOL(mISDN_FsmEvent);
84
85 void
mISDN_FsmChangeState(struct FsmInst * fi,int newstate)86 mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
87 {
88 fi->state = newstate;
89 if (fi->debug)
90 fi->printdebug(fi, "ChangeState %s",
91 fi->fsm->strState[newstate]);
92 }
93 EXPORT_SYMBOL(mISDN_FsmChangeState);
94
95 static void
FsmExpireTimer(struct timer_list * t)96 FsmExpireTimer(struct timer_list *t)
97 {
98 struct FsmTimer *ft = from_timer(ft, t, tl);
99 #if FSM_TIMER_DEBUG
100 if (ft->fi->debug)
101 ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
102 #endif
103 mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
104 }
105
106 void
mISDN_FsmInitTimer(struct FsmInst * fi,struct FsmTimer * ft)107 mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
108 {
109 ft->fi = fi;
110 #if FSM_TIMER_DEBUG
111 if (ft->fi->debug)
112 ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
113 #endif
114 timer_setup(&ft->tl, FsmExpireTimer, 0);
115 }
116 EXPORT_SYMBOL(mISDN_FsmInitTimer);
117
118 void
mISDN_FsmDelTimer(struct FsmTimer * ft,int where)119 mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
120 {
121 #if FSM_TIMER_DEBUG
122 if (ft->fi->debug)
123 ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
124 (long) ft, where);
125 #endif
126 del_timer(&ft->tl);
127 }
128 EXPORT_SYMBOL(mISDN_FsmDelTimer);
129
130 int
mISDN_FsmAddTimer(struct FsmTimer * ft,int millisec,int event,void * arg,int where)131 mISDN_FsmAddTimer(struct FsmTimer *ft,
132 int millisec, int event, void *arg, int where)
133 {
134
135 #if FSM_TIMER_DEBUG
136 if (ft->fi->debug)
137 ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
138 (long) ft, millisec, where);
139 #endif
140
141 if (timer_pending(&ft->tl)) {
142 if (ft->fi->debug) {
143 printk(KERN_WARNING
144 "mISDN_FsmAddTimer: timer already active!\n");
145 ft->fi->printdebug(ft->fi,
146 "mISDN_FsmAddTimer already active!");
147 }
148 return -1;
149 }
150 ft->event = event;
151 ft->arg = arg;
152 ft->tl.expires = jiffies + (millisec * HZ) / 1000;
153 add_timer(&ft->tl);
154 return 0;
155 }
156 EXPORT_SYMBOL(mISDN_FsmAddTimer);
157
158 void
mISDN_FsmRestartTimer(struct FsmTimer * ft,int millisec,int event,void * arg,int where)159 mISDN_FsmRestartTimer(struct FsmTimer *ft,
160 int millisec, int event, void *arg, int where)
161 {
162
163 #if FSM_TIMER_DEBUG
164 if (ft->fi->debug)
165 ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
166 (long) ft, millisec, where);
167 #endif
168
169 if (timer_pending(&ft->tl))
170 del_timer(&ft->tl);
171 ft->event = event;
172 ft->arg = arg;
173 ft->tl.expires = jiffies + (millisec * HZ) / 1000;
174 add_timer(&ft->tl);
175 }
176 EXPORT_SYMBOL(mISDN_FsmRestartTimer);
177