summaryrefslogtreecommitdiff
path: root/drivers/isdn/mISDN/fsm.c
blob: 7c5c2ca6c6d8877547a0064261cbe763ebdab931 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
// SPDX-License-Identifier: GPL-2.0-only
/*
 * finite state machine implementation
 *
 * Author       Karsten Keil <kkeil@novell.com>
 *
 * Thanks to    Jan den Ouden
 *              Fritz Elfert
 * Copyright 2008  by Karsten Keil <kkeil@novell.com>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/string.h>
#include "fsm.h"

#define FSM_TIMER_DEBUG 0

int
mISDN_FsmNew(struct Fsm *fsm,
	     struct FsmNode *fnlist, int fncount)
{
	int i;

	fsm->jumpmatrix =
		kzalloc(array3_size(sizeof(FSMFNPTR), fsm->state_count,
				    fsm->event_count),
			GFP_KERNEL);
	if (fsm->jumpmatrix == NULL)
		return -ENOMEM;

	for (i = 0; i < fncount; i++)
		if ((fnlist[i].state >= fsm->state_count) ||
		    (fnlist[i].event >= fsm->event_count)) {
			printk(KERN_ERR
			       "mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
			       i, (long)fnlist[i].state, (long)fsm->state_count,
			       (long)fnlist[i].event, (long)fsm->event_count);
		} else
			fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
					fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
	return 0;
}
EXPORT_SYMBOL(mISDN_FsmNew);

void
mISDN_FsmFree(struct Fsm *fsm)
{
	kfree((void *) fsm->jumpmatrix);
}
EXPORT_SYMBOL(mISDN_FsmFree);

int
mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg)
{
	FSMFNPTR r;

	if ((fi->state >= fi->fsm->state_count) ||
	    (event >= fi->fsm->event_count)) {
		printk(KERN_ERR
		       "mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
		       (long)fi->state, (long)fi->fsm->state_count, event,
		       (long)fi->fsm->event_count);
		return 1;
	}
	r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
	if (r) {
		if (fi->debug)
			fi->printdebug(fi, "State %s Event %s",
				       fi->fsm->strState[fi->state],
				       fi->fsm->strEvent[event]);
		r(fi, event, arg);
		return 0;
	} else {
		if (fi->debug)
			fi->printdebug(fi, "State %s Event %s no action",
				       fi->fsm->strState[fi->state],
				       fi->fsm->strEvent[event]);
		return 1;
	}
}
EXPORT_SYMBOL(mISDN_FsmEvent);

void
mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
{
	fi->state = newstate;
	if (fi->debug)
		fi->printdebug(fi, "ChangeState %s",
			       fi->fsm->strState[newstate]);
}
EXPORT_SYMBOL(mISDN_FsmChangeState);

static void
FsmExpireTimer(struct timer_list *t)
{
	struct FsmTimer *ft = from_timer(ft, t, tl);
#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
#endif
	mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
}

void
mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
{
	ft->fi = fi;
#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
#endif
	timer_setup(&ft->tl, FsmExpireTimer, 0);
}
EXPORT_SYMBOL(mISDN_FsmInitTimer);

void
mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
{
#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
				   (long) ft, where);
#endif
	del_timer(&ft->tl);
}
EXPORT_SYMBOL(mISDN_FsmDelTimer);

int
mISDN_FsmAddTimer(struct FsmTimer *ft,
		  int millisec, int event, void *arg, int where)
{

#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
				   (long) ft, millisec, where);
#endif

	if (timer_pending(&ft->tl)) {
		if (ft->fi->debug) {
			printk(KERN_WARNING
			       "mISDN_FsmAddTimer: timer already active!\n");
			ft->fi->printdebug(ft->fi,
					   "mISDN_FsmAddTimer already active!");
		}
		return -1;
	}
	ft->event = event;
	ft->arg = arg;
	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
	add_timer(&ft->tl);
	return 0;
}
EXPORT_SYMBOL(mISDN_FsmAddTimer);

void
mISDN_FsmRestartTimer(struct FsmTimer *ft,
		      int millisec, int event, void *arg, int where)
{

#if FSM_TIMER_DEBUG
	if (ft->fi->debug)
		ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
				   (long) ft, millisec, where);
#endif

	if (timer_pending(&ft->tl))
		del_timer(&ft->tl);
	ft->event = event;
	ft->arg = arg;
	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
	add_timer(&ft->tl);
}
EXPORT_SYMBOL(mISDN_FsmRestartTimer);