1 /*********************************************************************
2 *
3 * Filename: iriap_event.c
4 * Version: 0.1
5 * Description: IAP Finite State Machine
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Thu Aug 21 00:02:07 1997
9 * Modified at: Wed Mar 1 11:28:34 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1997, 1999-2000 Dag Brattli <dagb@cs.uit.no>,
13 * All Rights Reserved.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * Neither Dag Brattli nor University of Tromsų admit liability nor
21 * provide warranty for any of this software. This material is
22 * provided "AS-IS" and at no charge.
23 *
24 ********************************************************************/
25
26 #include <net/irda/irda.h>
27 #include <net/irda/irlmp.h>
28 #include <net/irda/iriap.h>
29 #include <net/irda/iriap_event.h>
30
31 static void state_s_disconnect (struct iriap_cb *self, IRIAP_EVENT event,
32 struct sk_buff *skb);
33 static void state_s_connecting (struct iriap_cb *self, IRIAP_EVENT event,
34 struct sk_buff *skb);
35 static void state_s_call (struct iriap_cb *self, IRIAP_EVENT event,
36 struct sk_buff *skb);
37
38 static void state_s_make_call (struct iriap_cb *self, IRIAP_EVENT event,
39 struct sk_buff *skb);
40 static void state_s_calling (struct iriap_cb *self, IRIAP_EVENT event,
41 struct sk_buff *skb);
42 static void state_s_outstanding (struct iriap_cb *self, IRIAP_EVENT event,
43 struct sk_buff *skb);
44 static void state_s_replying (struct iriap_cb *self, IRIAP_EVENT event,
45 struct sk_buff *skb);
46 static void state_s_wait_for_call(struct iriap_cb *self, IRIAP_EVENT event,
47 struct sk_buff *skb);
48 static void state_s_wait_active (struct iriap_cb *self, IRIAP_EVENT event,
49 struct sk_buff *skb);
50
51 static void state_r_disconnect (struct iriap_cb *self, IRIAP_EVENT event,
52 struct sk_buff *skb);
53 static void state_r_call (struct iriap_cb *self, IRIAP_EVENT event,
54 struct sk_buff *skb);
55 static void state_r_waiting (struct iriap_cb *self, IRIAP_EVENT event,
56 struct sk_buff *skb);
57 static void state_r_wait_active (struct iriap_cb *self, IRIAP_EVENT event,
58 struct sk_buff *skb);
59 static void state_r_receiving (struct iriap_cb *self, IRIAP_EVENT event,
60 struct sk_buff *skb);
61 static void state_r_execute (struct iriap_cb *self, IRIAP_EVENT event,
62 struct sk_buff *skb);
63 static void state_r_returning (struct iriap_cb *self, IRIAP_EVENT event,
64 struct sk_buff *skb);
65
66 static void (*iriap_state[])(struct iriap_cb *self, IRIAP_EVENT event,
67 struct sk_buff *skb) = {
68 /* Client FSM */
69 state_s_disconnect,
70 state_s_connecting,
71 state_s_call,
72
73 /* S-Call FSM */
74 state_s_make_call,
75 state_s_calling,
76 state_s_outstanding,
77 state_s_replying,
78 state_s_wait_for_call,
79 state_s_wait_active,
80
81 /* Server FSM */
82 state_r_disconnect,
83 state_r_call,
84
85 /* R-Connect FSM */
86 state_r_waiting,
87 state_r_wait_active,
88 state_r_receiving,
89 state_r_execute,
90 state_r_returning,
91 };
92
93 void iriap_next_client_state(struct iriap_cb *self, IRIAP_STATE state)
94 {
95 ASSERT(self != NULL, return;);
96 ASSERT(self->magic == IAS_MAGIC, return;);
97
98 self->client_state = state;
99 }
100
101 void iriap_next_call_state(struct iriap_cb *self, IRIAP_STATE state)
102 {
103 ASSERT(self != NULL, return;);
104 ASSERT(self->magic == IAS_MAGIC, return;);
105
106 self->call_state = state;
107 }
108
109 void iriap_next_server_state(struct iriap_cb *self, IRIAP_STATE state)
110 {
111 ASSERT(self != NULL, return;);
112 ASSERT(self->magic == IAS_MAGIC, return;);
113
114 self->server_state = state;
115 }
116
117 void iriap_next_r_connect_state(struct iriap_cb *self, IRIAP_STATE state)
118 {
119 ASSERT(self != NULL, return;);
120 ASSERT(self->magic == IAS_MAGIC, return;);
121
122 self->r_connect_state = state;
123 }
124
125 void iriap_do_client_event(struct iriap_cb *self, IRIAP_EVENT event,
126 struct sk_buff *skb)
127 {
128 ASSERT(self != NULL, return;);
129 ASSERT(self->magic == IAS_MAGIC, return;);
130
131 (*iriap_state[ self->client_state]) (self, event, skb);
132 }
133
134 void iriap_do_call_event(struct iriap_cb *self, IRIAP_EVENT event,
135 struct sk_buff *skb)
136 {
137 ASSERT(self != NULL, return;);
138 ASSERT(self->magic == IAS_MAGIC, return;);
139
140 (*iriap_state[ self->call_state]) (self, event, skb);
141 }
142
143 void iriap_do_server_event(struct iriap_cb *self, IRIAP_EVENT event,
144 struct sk_buff *skb)
145 {
146 ASSERT(self != NULL, return;);
147 ASSERT(self->magic == IAS_MAGIC, return;);
148
149 (*iriap_state[ self->server_state]) (self, event, skb);
150 }
151
152 void iriap_do_r_connect_event(struct iriap_cb *self, IRIAP_EVENT event,
153 struct sk_buff *skb)
154 {
155 ASSERT(self != NULL, return;);
156 ASSERT(self->magic == IAS_MAGIC, return;);
157
158 (*iriap_state[ self->r_connect_state]) (self, event, skb);
159 }
160
161
162 /*
163 * Function state_s_disconnect (event, skb)
164 *
165 * S-Disconnect, The device has no LSAP connection to a particular
166 * remote device.
167 */
168 static void state_s_disconnect(struct iriap_cb *self, IRIAP_EVENT event,
169 struct sk_buff *skb)
170 {
171 ASSERT(self != NULL, return;);
172 ASSERT(self->magic == IAS_MAGIC, return;);
173
174 switch (event) {
175 case IAP_CALL_REQUEST_GVBC:
176 iriap_next_client_state(self, S_CONNECTING);
177 ASSERT(self->skb == NULL, return;);
178 self->skb = skb;
179 iriap_connect_request(self);
180 break;
181 case IAP_LM_DISCONNECT_INDICATION:
182 break;
183 default:
184 IRDA_DEBUG(0, __FUNCTION__"(), Unknown event %d\n", event);
185 break;
186 }
187 }
188
189 /*
190 * Function state_s_connecting (self, event, skb)
191 *
192 * S-Connecting
193 *
194 */
195 static void state_s_connecting(struct iriap_cb *self, IRIAP_EVENT event,
196 struct sk_buff *skb)
197 {
198 ASSERT(self != NULL, return;);
199 ASSERT(self->magic == IAS_MAGIC, return;);
200
201 switch (event) {
202 case IAP_LM_CONNECT_CONFIRM:
203 /*
204 * Jump to S-Call FSM
205 */
206 iriap_do_call_event(self, IAP_CALL_REQUEST, skb);
207 /* iriap_call_request(self, 0,0,0); */
208 iriap_next_client_state(self, S_CALL);
209 break;
210 case IAP_LM_DISCONNECT_INDICATION:
211 /* Abort calls */
212 iriap_next_call_state(self, S_MAKE_CALL);
213 iriap_next_client_state(self, S_DISCONNECT);
214 break;
215 default:
216 IRDA_DEBUG(0, __FUNCTION__ "(), Unknown event %d\n", event);
217 break;
218 }
219 }
220
221 /*
222 * Function state_s_call (self, event, skb)
223 *
224 * S-Call, The device can process calls to a specific remote
225 * device. Whenever the LSAP connection is disconnected, this state
226 * catches that event and clears up
227 */
228 static void state_s_call(struct iriap_cb *self, IRIAP_EVENT event,
229 struct sk_buff *skb)
230 {
231 ASSERT(self != NULL, return;);
232
233 switch (event) {
234 case IAP_LM_DISCONNECT_INDICATION:
235 /* Abort calls */
236 iriap_next_call_state(self, S_MAKE_CALL);
237 iriap_next_client_state(self, S_DISCONNECT);
238 break;
239 default:
240 IRDA_DEBUG(0, "state_s_call: Unknown event %d\n", event);
241 break;
242 }
243 }
244
245 /*
246 * Function state_s_make_call (event, skb)
247 *
248 * S-Make-Call
249 *
250 */
251 static void state_s_make_call(struct iriap_cb *self, IRIAP_EVENT event,
252 struct sk_buff *skb)
253 {
254 ASSERT(self != NULL, return;);
255
256 switch (event) {
257 case IAP_CALL_REQUEST:
258 skb = self->skb;
259 self->skb = NULL;
260
261 irlmp_data_request(self->lsap, skb);
262 iriap_next_call_state(self, S_OUTSTANDING);
263 break;
264 default:
265 IRDA_DEBUG(0, __FUNCTION__ "(), Unknown event %d\n", event);
266 if (skb)
267 dev_kfree_skb(skb);
268 break;
269 }
270 }
271
272 /*
273 * Function state_s_calling (event, skb)
274 *
275 * S-Calling
276 *
277 */
278 static void state_s_calling(struct iriap_cb *self, IRIAP_EVENT event,
279 struct sk_buff *skb)
280 {
281 IRDA_DEBUG(0, __FUNCTION__ "(), Not implemented\n");
282 }
283
284 /*
285 * Function state_s_outstanding (event, skb)
286 *
287 * S-Outstanding, The device is waiting for a response to a command
288 *
289 */
290 static void state_s_outstanding(struct iriap_cb *self, IRIAP_EVENT event,
291 struct sk_buff *skb)
292 {
293 ASSERT(self != NULL, return;);
294
295 switch (event) {
296 case IAP_RECV_F_LST:
297 /*iriap_send_ack(self);*/
298 /*LM_Idle_request(idle); */
299
300 iriap_next_call_state(self, S_WAIT_FOR_CALL);
301 break;
302 default:
303 IRDA_DEBUG(0, __FUNCTION__ "(), Unknown event %d\n", event);
304 break;
305 }
306 }
307
308 /*
309 * Function state_s_replying (event, skb)
310 *
311 * S-Replying, The device is collecting a multiple part response
312 */
313 static void state_s_replying(struct iriap_cb *self, IRIAP_EVENT event,
314 struct sk_buff *skb)
315 {
316 IRDA_DEBUG(0, __FUNCTION__ "(), Not implemented\n");
317 }
318
319 /*
320 * Function state_s_wait_for_call (event, skb)
321 *
322 * S-Wait-for-Call
323 *
324 */
325 static void state_s_wait_for_call(struct iriap_cb *self, IRIAP_EVENT event,
326 struct sk_buff *skb)
327 {
328 IRDA_DEBUG(0, __FUNCTION__ "(), Not implemented\n");
329 }
330
331
332 /*
333 * Function state_s_wait_active (event, skb)
334 *
335 * S-Wait-Active
336 *
337 */
338 static void state_s_wait_active(struct iriap_cb *self, IRIAP_EVENT event,
339 struct sk_buff *skb)
340 {
341 IRDA_DEBUG(0, __FUNCTION__ "(), Not implemented\n");
342 }
343
344 /**************************************************************************
345 *
346 * Server FSM
347 *
348 **************************************************************************/
349
350 /*
351 * Function state_r_disconnect (self, event, skb)
352 *
353 * LM-IAS server is disconnected (not processing any requests!)
354 *
355 */
356 static void state_r_disconnect(struct iriap_cb *self, IRIAP_EVENT event,
357 struct sk_buff *skb)
358 {
359 struct sk_buff *tx_skb;
360
361 switch (event) {
362 case IAP_LM_CONNECT_INDICATION:
363 tx_skb = dev_alloc_skb(64);
364 if (tx_skb == NULL) {
365 WARNING(__FUNCTION__ "(), unable to malloc!\n");
366 return;
367 }
368
369 /* Reserve space for MUX_CONTROL and LAP header */
370 skb_reserve(tx_skb, LMP_MAX_HEADER);
371
372 irlmp_connect_response(self->lsap, tx_skb);
373 /*LM_Idle_request(idle); */
374
375 iriap_next_server_state(self, R_CALL);
376
377 /*
378 * Jump to R-Connect FSM, we skip R-Waiting since we do not
379 * care about LM_Idle_request()!
380 */
381 iriap_next_r_connect_state(self, R_RECEIVING);
382
383 if (skb)
384 dev_kfree_skb(skb);
385
386 break;
387 default:
388 IRDA_DEBUG(0, __FUNCTION__ "(), unknown event %d\n", event);
389 break;
390 }
391 }
392
393 /*
394 * Function state_r_call (self, event, skb)
395 *
396 *
397 *
398 */
399 static void state_r_call(struct iriap_cb *self, IRIAP_EVENT event,
400 struct sk_buff *skb)
401 {
402 IRDA_DEBUG(4, __FUNCTION__ "()\n");
403
404 switch (event) {
405 case IAP_LM_DISCONNECT_INDICATION:
406 /* Abort call */
407 iriap_next_server_state(self, R_DISCONNECT);
408 iriap_next_r_connect_state(self, R_WAITING);
409 break;
410 default:
411 IRDA_DEBUG(0, __FUNCTION__ "(), unknown event!\n");
412 break;
413 }
414 }
415
416 /*
417 * R-Connect FSM
418 */
419
420 /*
421 * Function state_r_waiting (self, event, skb)
422 *
423 *
424 *
425 */
426 static void state_r_waiting(struct iriap_cb *self, IRIAP_EVENT event,
427 struct sk_buff *skb)
428 {
429 IRDA_DEBUG(0, __FUNCTION__ "(), Not implemented\n");
430 }
431
432 static void state_r_wait_active(struct iriap_cb *self, IRIAP_EVENT event,
433 struct sk_buff *skb)
434 {
435 IRDA_DEBUG(0, __FUNCTION__ "(), Not implemented\n");
436 }
437
438 /*
439 * Function state_r_receiving (self, event, skb)
440 *
441 * We are receiving a command
442 *
443 */
444 static void state_r_receiving(struct iriap_cb *self, IRIAP_EVENT event,
445 struct sk_buff *skb)
446 {
447 IRDA_DEBUG(4, __FUNCTION__ "()\n");
448
449 switch (event) {
450 case IAP_RECV_F_LST:
451 iriap_next_r_connect_state(self, R_EXECUTE);
452
453 iriap_call_indication(self, skb);
454 break;
455 default:
456 IRDA_DEBUG(0, __FUNCTION__ "(), unknown event!\n");
457 break;
458 }
459
460 }
461
462 /*
463 * Function state_r_execute (self, event, skb)
464 *
465 * The server is processing the request
466 *
467 */
468 static void state_r_execute(struct iriap_cb *self, IRIAP_EVENT event,
469 struct sk_buff *skb)
470 {
471 IRDA_DEBUG(4, __FUNCTION__ "()\n");
472
473 ASSERT(skb != NULL, return;);
474
475 if (!self || self->magic != IAS_MAGIC) {
476 IRDA_DEBUG(0, __FUNCTION__ "(), bad pointer self\n");
477 return;
478 }
479
480 switch (event) {
481 case IAP_CALL_RESPONSE:
482 /*
483 * Since we don't implement the Waiting state, we return
484 * to state Receiving instead, DB.
485 */
486 iriap_next_r_connect_state(self, R_RECEIVING);
487
488 irlmp_data_request(self->lsap, skb);
489 break;
490 default:
491 IRDA_DEBUG(0, __FUNCTION__ "(), unknown event!\n");
492 break;
493 }
494 }
495
496 static void state_r_returning(struct iriap_cb *self, IRIAP_EVENT event,
497 struct sk_buff *skb)
498 {
499 IRDA_DEBUG(0, __FUNCTION__ "(), event=%d\n", event);
500
501 switch (event) {
502 case IAP_RECV_F_LST:
503
504 break;
505 default:
506 break;
507 }
508 }
509
510
511
512
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