1 /*********************************************************************
2 *
3 * Filename: ircomm_event.c
4 * Version: 1.0
5 * Description: IrCOMM layer state machine
6 * Status: Stable
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sun Jun 6 20:33:11 1999
9 * Modified at: Sun Dec 12 13:44:32 1999
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1999 Dag Brattli, All Rights Reserved.
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation; either version 2 of
17 * the License, or (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 * MA 02111-1307 USA
28 *
29 ********************************************************************/
30
31 #include <linux/proc_fs.h>
32 #include <linux/init.h>
33
34 #include <net/irda/irda.h>
35 #include <net/irda/irlmp.h>
36 #include <net/irda/iriap.h>
37 #include <net/irda/irttp.h>
38 #include <net/irda/irias_object.h>
39
40 #include <net/irda/ircomm_core.h>
41 #include <net/irda/ircomm_event.h>
42
43 static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
44 struct sk_buff *skb, struct ircomm_info *info);
45 static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
46 struct sk_buff *skb, struct ircomm_info *info);
47 static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
48 struct sk_buff *skb, struct ircomm_info *info);
49 static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
50 struct sk_buff *skb, struct ircomm_info *info);
51
52 const char *const ircomm_state[] = {
53 "IRCOMM_IDLE",
54 "IRCOMM_WAITI",
55 "IRCOMM_WAITR",
56 "IRCOMM_CONN",
57 };
58
59 #ifdef CONFIG_IRDA_DEBUG
60 static const char *const ircomm_event[] = {
61 "IRCOMM_CONNECT_REQUEST",
62 "IRCOMM_CONNECT_RESPONSE",
63 "IRCOMM_TTP_CONNECT_INDICATION",
64 "IRCOMM_LMP_CONNECT_INDICATION",
65 "IRCOMM_TTP_CONNECT_CONFIRM",
66 "IRCOMM_LMP_CONNECT_CONFIRM",
67
68 "IRCOMM_LMP_DISCONNECT_INDICATION",
69 "IRCOMM_TTP_DISCONNECT_INDICATION",
70 "IRCOMM_DISCONNECT_REQUEST",
71
72 "IRCOMM_TTP_DATA_INDICATION",
73 "IRCOMM_LMP_DATA_INDICATION",
74 "IRCOMM_DATA_REQUEST",
75 "IRCOMM_CONTROL_REQUEST",
76 "IRCOMM_CONTROL_INDICATION",
77 };
78 #endif /* CONFIG_IRDA_DEBUG */
79
80 static int (*state[])(struct ircomm_cb *self, IRCOMM_EVENT event,
81 struct sk_buff *skb, struct ircomm_info *info) =
82 {
83 ircomm_state_idle,
84 ircomm_state_waiti,
85 ircomm_state_waitr,
86 ircomm_state_conn,
87 };
88
89 /*
90 * Function ircomm_state_idle (self, event, skb)
91 *
92 * IrCOMM is currently idle
93 *
94 */
ircomm_state_idle(struct ircomm_cb * self,IRCOMM_EVENT event,struct sk_buff * skb,struct ircomm_info * info)95 static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
96 struct sk_buff *skb, struct ircomm_info *info)
97 {
98 int ret = 0;
99
100 switch (event) {
101 case IRCOMM_CONNECT_REQUEST:
102 ircomm_next_state(self, IRCOMM_WAITI);
103 ret = self->issue.connect_request(self, skb, info);
104 break;
105 case IRCOMM_TTP_CONNECT_INDICATION:
106 case IRCOMM_LMP_CONNECT_INDICATION:
107 ircomm_next_state(self, IRCOMM_WAITR);
108 ircomm_connect_indication(self, skb, info);
109 break;
110 default:
111 IRDA_DEBUG(4, "%s(), unknown event: %s\n", __func__ ,
112 ircomm_event[event]);
113 ret = -EINVAL;
114 }
115 return ret;
116 }
117
118 /*
119 * Function ircomm_state_waiti (self, event, skb)
120 *
121 * The IrCOMM user has requested an IrCOMM connection to the remote
122 * device and is awaiting confirmation
123 */
ircomm_state_waiti(struct ircomm_cb * self,IRCOMM_EVENT event,struct sk_buff * skb,struct ircomm_info * info)124 static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
125 struct sk_buff *skb, struct ircomm_info *info)
126 {
127 int ret = 0;
128
129 switch (event) {
130 case IRCOMM_TTP_CONNECT_CONFIRM:
131 case IRCOMM_LMP_CONNECT_CONFIRM:
132 ircomm_next_state(self, IRCOMM_CONN);
133 ircomm_connect_confirm(self, skb, info);
134 break;
135 case IRCOMM_TTP_DISCONNECT_INDICATION:
136 case IRCOMM_LMP_DISCONNECT_INDICATION:
137 ircomm_next_state(self, IRCOMM_IDLE);
138 ircomm_disconnect_indication(self, skb, info);
139 break;
140 default:
141 IRDA_DEBUG(0, "%s(), unknown event: %s\n", __func__ ,
142 ircomm_event[event]);
143 ret = -EINVAL;
144 }
145 return ret;
146 }
147
148 /*
149 * Function ircomm_state_waitr (self, event, skb)
150 *
151 * IrCOMM has received an incoming connection request and is awaiting
152 * response from the user
153 */
ircomm_state_waitr(struct ircomm_cb * self,IRCOMM_EVENT event,struct sk_buff * skb,struct ircomm_info * info)154 static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
155 struct sk_buff *skb, struct ircomm_info *info)
156 {
157 int ret = 0;
158
159 switch (event) {
160 case IRCOMM_CONNECT_RESPONSE:
161 ircomm_next_state(self, IRCOMM_CONN);
162 ret = self->issue.connect_response(self, skb);
163 break;
164 case IRCOMM_DISCONNECT_REQUEST:
165 ircomm_next_state(self, IRCOMM_IDLE);
166 ret = self->issue.disconnect_request(self, skb, info);
167 break;
168 case IRCOMM_TTP_DISCONNECT_INDICATION:
169 case IRCOMM_LMP_DISCONNECT_INDICATION:
170 ircomm_next_state(self, IRCOMM_IDLE);
171 ircomm_disconnect_indication(self, skb, info);
172 break;
173 default:
174 IRDA_DEBUG(0, "%s(), unknown event = %s\n", __func__ ,
175 ircomm_event[event]);
176 ret = -EINVAL;
177 }
178 return ret;
179 }
180
181 /*
182 * Function ircomm_state_conn (self, event, skb)
183 *
184 * IrCOMM is connected to the peer IrCOMM device
185 *
186 */
ircomm_state_conn(struct ircomm_cb * self,IRCOMM_EVENT event,struct sk_buff * skb,struct ircomm_info * info)187 static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
188 struct sk_buff *skb, struct ircomm_info *info)
189 {
190 int ret = 0;
191
192 switch (event) {
193 case IRCOMM_DATA_REQUEST:
194 ret = self->issue.data_request(self, skb, 0);
195 break;
196 case IRCOMM_TTP_DATA_INDICATION:
197 ircomm_process_data(self, skb);
198 break;
199 case IRCOMM_LMP_DATA_INDICATION:
200 ircomm_data_indication(self, skb);
201 break;
202 case IRCOMM_CONTROL_REQUEST:
203 /* Just send a separate frame for now */
204 ret = self->issue.data_request(self, skb, skb->len);
205 break;
206 case IRCOMM_TTP_DISCONNECT_INDICATION:
207 case IRCOMM_LMP_DISCONNECT_INDICATION:
208 ircomm_next_state(self, IRCOMM_IDLE);
209 ircomm_disconnect_indication(self, skb, info);
210 break;
211 case IRCOMM_DISCONNECT_REQUEST:
212 ircomm_next_state(self, IRCOMM_IDLE);
213 ret = self->issue.disconnect_request(self, skb, info);
214 break;
215 default:
216 IRDA_DEBUG(0, "%s(), unknown event = %s\n", __func__ ,
217 ircomm_event[event]);
218 ret = -EINVAL;
219 }
220 return ret;
221 }
222
223 /*
224 * Function ircomm_do_event (self, event, skb)
225 *
226 * Process event
227 *
228 */
ircomm_do_event(struct ircomm_cb * self,IRCOMM_EVENT event,struct sk_buff * skb,struct ircomm_info * info)229 int ircomm_do_event(struct ircomm_cb *self, IRCOMM_EVENT event,
230 struct sk_buff *skb, struct ircomm_info *info)
231 {
232 IRDA_DEBUG(4, "%s: state=%s, event=%s\n", __func__ ,
233 ircomm_state[self->state], ircomm_event[event]);
234
235 return (*state[self->state])(self, event, skb, info);
236 }
237
238 /*
239 * Function ircomm_next_state (self, state)
240 *
241 * Switch state
242 *
243 */
ircomm_next_state(struct ircomm_cb * self,IRCOMM_STATE state)244 void ircomm_next_state(struct ircomm_cb *self, IRCOMM_STATE state)
245 {
246 self->state = state;
247
248 IRDA_DEBUG(4, "%s: next state=%s, service type=%d\n", __func__ ,
249 ircomm_state[self->state], self->service_type);
250 }
251