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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/**
* A generic FSM based on fsm used in isdn4linux
*
*/
#include "fsm.h"
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/timer.h>
MODULE_AUTHOR("(C) 2000 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
MODULE_DESCRIPTION("Finite state machine helper functions");
MODULE_LICENSE("GPL");
fsm_instance *
init_fsm(char *name, const char **state_names, const char **event_names, int nr_states,
int nr_events, const fsm_node *tmpl, int tmpl_len, gfp_t order)
{
int i;
fsm_instance *this;
fsm_function_t *m;
fsm *f;
this = kzalloc(sizeof(fsm_instance), order);
if (this == NULL) {
printk(KERN_WARNING
"fsm(%s): init_fsm: Couldn't alloc instance\n", name);
return NULL;
}
strlcpy(this->name, name, sizeof(this->name));
init_waitqueue_head(&this->wait_q);
f = kzalloc(sizeof(fsm), order);
if (f == NULL) {
printk(KERN_WARNING
"fsm(%s): init_fsm: Couldn't alloc fsm\n", name);
kfree_fsm(this);
return NULL;
}
f->nr_events = nr_events;
f->nr_states = nr_states;
f->event_names = event_names;
f->state_names = state_names;
this->f = f;
m = kcalloc(nr_states*nr_events, sizeof(fsm_function_t), order);
if (m == NULL) {
printk(KERN_WARNING
"fsm(%s): init_fsm: Couldn't alloc jumptable\n", name);
kfree_fsm(this);
return NULL;
}
f->jumpmatrix = m;
for (i = 0; i < tmpl_len; i++) {
if ((tmpl[i].cond_state >= nr_states) ||
(tmpl[i].cond_event >= nr_events) ) {
printk(KERN_ERR
"fsm(%s): init_fsm: Bad template l=%d st(%ld/%ld) ev(%ld/%ld)\n",
name, i, (long)tmpl[i].cond_state, (long)f->nr_states,
(long)tmpl[i].cond_event, (long)f->nr_events);
kfree_fsm(this);
return NULL;
} else
m[nr_states * tmpl[i].cond_event + tmpl[i].cond_state] =
tmpl[i].function;
}
return this;
}
void
kfree_fsm(fsm_instance *this)
{
if (this) {
if (this->f) {
kfree(this->f->jumpmatrix);
kfree(this->f);
}
kfree(this);
} else
printk(KERN_WARNING
"fsm: kfree_fsm called with NULL argument\n");
}
#if FSM_DEBUG_HISTORY
void
fsm_print_history(fsm_instance *fi)
{
int idx = 0;
int i;
if (fi->history_size >= FSM_HISTORY_SIZE)
idx = fi->history_index;
printk(KERN_DEBUG "fsm(%s): History:\n", fi->name);
for (i = 0; i < fi->history_size; i++) {
int e = fi->history[idx].event;
int s = fi->history[idx++].state;
idx %= FSM_HISTORY_SIZE;
if (e == -1)
printk(KERN_DEBUG " S=%s\n",
fi->f->state_names[s]);
else
printk(KERN_DEBUG " S=%s E=%s\n",
fi->f->state_names[s],
fi->f->event_names[e]);
}
fi->history_size = fi->history_index = 0;
}
void
fsm_record_history(fsm_instance *fi, int state, int event)
{
fi->history[fi->history_index].state = state;
fi->history[fi->history_index++].event = event;
fi->history_index %= FSM_HISTORY_SIZE;
if (fi->history_size < FSM_HISTORY_SIZE)
fi->history_size++;
}
#endif
const char *
fsm_getstate_str(fsm_instance *fi)
{
int st = atomic_read(&fi->state);
if (st >= fi->f->nr_states)
return "Invalid";
return fi->f->state_names[st];
}
static void
fsm_expire_timer(fsm_timer *this)
{
#if FSM_TIMER_DEBUG
printk(KERN_DEBUG "fsm(%s): Timer %p expired\n",
this->fi->name, this);
#endif
fsm_event(this->fi, this->expire_event, this->event_arg);
}
void
fsm_settimer(fsm_instance *fi, fsm_timer *this)
{
this->fi = fi;
this->tl.function = (void *)fsm_expire_timer;
this->tl.data = (long)this;
#if FSM_TIMER_DEBUG
printk(KERN_DEBUG "fsm(%s): Create timer %p\n", fi->name,
this);
#endif
init_timer(&this->tl);
}
void
fsm_deltimer(fsm_timer *this)
{
#if FSM_TIMER_DEBUG
printk(KERN_DEBUG "fsm(%s): Delete timer %p\n", this->fi->name,
this);
#endif
del_timer(&this->tl);
}
int
fsm_addtimer(fsm_timer *this, int millisec, int event, void *arg)
{
#if FSM_TIMER_DEBUG
printk(KERN_DEBUG "fsm(%s): Add timer %p %dms\n",
this->fi->name, this, millisec);
#endif
init_timer(&this->tl);
this->tl.function = (void *)fsm_expire_timer;
this->tl.data = (long)this;
this->expire_event = event;
this->event_arg = arg;
this->tl.expires = jiffies + (millisec * HZ) / 1000;
add_timer(&this->tl);
return 0;
}
/* FIXME: this function is never used, why */
void
fsm_modtimer(fsm_timer *this, int millisec, int event, void *arg)
{
#if FSM_TIMER_DEBUG
printk(KERN_DEBUG "fsm(%s): Restart timer %p %dms\n",
this->fi->name, this, millisec);
#endif
del_timer(&this->tl);
init_timer(&this->tl);
this->tl.function = (void *)fsm_expire_timer;
this->tl.data = (long)this;
this->expire_event = event;
this->event_arg = arg;
this->tl.expires = jiffies + (millisec * HZ) / 1000;
add_timer(&this->tl);
}
EXPORT_SYMBOL(init_fsm);
EXPORT_SYMBOL(kfree_fsm);
EXPORT_SYMBOL(fsm_settimer);
EXPORT_SYMBOL(fsm_deltimer);
EXPORT_SYMBOL(fsm_addtimer);
EXPORT_SYMBOL(fsm_modtimer);
EXPORT_SYMBOL(fsm_getstate_str);
#if FSM_DEBUG_HISTORY
EXPORT_SYMBOL(fsm_print_history);
EXPORT_SYMBOL(fsm_record_history);
#endif
|
