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
|
#include <asm/errno.h>
#include "intf.h"
#include "trans.h"
#include "debug.h"
static int process_release(struct tsnif_handle *h, struct tsnif_term *term)
{
if (!h->ops || !h->ops->cb_release)
return -1;
term->state = TSNIF_INTF_STATE_DONE;
TSNIF_DEBUG(FSM, "type %d, idx %d\n", term->type, term->idx);
return h->ops->cb_release(term);
}
static int process_error(struct tsnif_handle *h, struct tsnif_term *term, int err)
{
if (!h->ops || !h->ops->cb_err)
return -1;
return h->ops->cb_err(term, err);
}
static int process_tgroup(struct tsnif_handle *h, struct tsnif_term *term,
int group)
{
int err;
err = trans_group(&h->trans, group);
term->state = err ? TSNIF_INTF_STATE_DONE : TSNIF_INTF_STATE_DATA;
TSNIF_DEBUG(FSM, "adding group %d, err %d\n", group, err);
return err;
}
static int process_data(struct tsnif_handle *h,
struct tsnif_term *term,
struct trans_msg *msg)
{
struct tsnif_data data;
TSNIF_DEBUG(FSM, "type %d, idx %d\n",
term->type, term->idx);
if (!h->ops || !h->ops->cb_data)
return -1;
data.ptr = msg->data.ptr;
data.len = msg->data.len;
data.flags = msg->data.flags;
data.time = msg->data.time;
data.ws = msg->data.ws;
return h->ops->cb_data(term, &data);
}
static int new(struct tsnif_handle *h,
struct tsnif_term *term,
struct trans_msg *msg)
{
TSNIF_DEBUG(FSM, "got data in the NEW state, something is wrong\n");
return -1;
}
static int attach(struct tsnif_handle *h,
struct tsnif_term *term,
struct trans_msg *msg)
{
int err = 0;
switch(msg->cmd) {
case TSNIF_CMD_TGROUP:
err = process_tgroup(h, term, msg->group);
break;
case TSNIF_CMD_ATTACH:
/* got attach ack, do nothing */
if (msg->ack)
break;
/* got ATTACH cmd without error */
err = -EINVAL;
if (!msg->err)
break;
err = process_error(h, term, msg->error);
break;
default:
return -1;
}
return err;
}
static int detach(struct tsnif_handle *h,
struct tsnif_term *term,
struct trans_msg *msg)
{
int err = 0;
switch(msg->cmd) {
case TSNIF_CMD_DETACH:
if (msg->ack)
return process_release(h, term);
err = -EINVAL;
if (!msg->err)
break;
err = process_error(h, term, msg->error);
break;
case TSNIF_CMD_DATA:
/* ignore DATA msg when in DETACH state */
break;
default:
return -1;
}
return err;
}
static int data(struct tsnif_handle *h,
struct tsnif_term *term,
struct trans_msg *msg)
{
int err = 0;
/* all ACKs should be ok in this state */
if (msg->ack)
return 0;
switch(msg->cmd) {
case TSNIF_CMD_DATA:
err = process_data(h, term, msg);
break;
default:
return -1;
}
return err;
}
int fsm_process(struct tsnif_handle *h,
struct tsnif_term *term,
struct trans_msg *msg)
{
TSNIF_DEBUG(FSM, "got cmd %d for term type %d, idx %d, state %d\n",
msg->cmd, term->type, term->idx, term->state);
/* we can get the release command in any state,
* so let's handle it globaly here */
if (msg->cmd == TSNIF_CMD_TTY_RELEASE)
return process_release(h, term);
switch(term->state) {
case TSNIF_INTF_STATE_NEW:
return new(h, term, msg);
case TSNIF_INTF_STATE_ATTACH:
return attach(h, term, msg);
case TSNIF_INTF_STATE_DETACH:
return detach(h, term, msg);
case TSNIF_INTF_STATE_DATA:
return data(h, term, msg);
default:
return -1;
}
return 0;
}
int fsm_send(struct tsnif_term *term, int cmd)
{
switch(cmd) {
case TSNIF_CMD_ATTACH:
if (term->state != TSNIF_INTF_STATE_NEW)
return -1;
term->state = TSNIF_INTF_STATE_ATTACH;
break;
case TSNIF_CMD_DETACH:
if (term->state != TSNIF_INTF_STATE_DATA)
return -1;
term->state = TSNIF_INTF_STATE_DETACH;
}
return 0;
}
|
