1 /*********************************************************************
2 *
3 * Filename: ircomm_tty_attach.c
4 * Version:
5 * Description: Code for attaching the serial driver to IrCOMM
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sat Jun 5 17:42:00 1999
9 * Modified at: Tue Jan 4 14:20:49 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
13 * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
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 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 * MA 02111-1307 USA
29 *
30 ********************************************************************/
31
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 #include <net/irda/parameters.h>
40
41 #include <net/irda/ircomm_core.h>
42 #include <net/irda/ircomm_param.h>
43 #include <net/irda/ircomm_event.h>
44
45 #include <net/irda/ircomm_tty.h>
46 #include <net/irda/ircomm_tty_attach.h>
47
48 static void ircomm_tty_ias_register(struct ircomm_tty_cb *self);
49 static void ircomm_tty_discovery_indication(discinfo_t *discovery,
50 DISCOVERY_MODE mode,
51 void *priv);
52 static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
53 struct ias_value *value, void *priv);
54 static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
55 int timeout);
56 static void ircomm_tty_watchdog_timer_expired(void *data);
57
58 static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
59 IRCOMM_TTY_EVENT event,
60 struct sk_buff *skb,
61 struct ircomm_tty_info *info);
62 static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
63 IRCOMM_TTY_EVENT event,
64 struct sk_buff *skb,
65 struct ircomm_tty_info *info);
66 static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
67 IRCOMM_TTY_EVENT event,
68 struct sk_buff *skb,
69 struct ircomm_tty_info *info);
70 static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
71 IRCOMM_TTY_EVENT event,
72 struct sk_buff *skb,
73 struct ircomm_tty_info *info);
74 static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
75 IRCOMM_TTY_EVENT event,
76 struct sk_buff *skb,
77 struct ircomm_tty_info *info);
78 static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
79 IRCOMM_TTY_EVENT event,
80 struct sk_buff *skb,
81 struct ircomm_tty_info *info);
82
83 char *ircomm_tty_state[] = {
84 "IRCOMM_TTY_IDLE",
85 "IRCOMM_TTY_SEARCH",
86 "IRCOMM_TTY_QUERY_PARAMETERS",
87 "IRCOMM_TTY_QUERY_LSAP_SEL",
88 "IRCOMM_TTY_SETUP",
89 "IRCOMM_TTY_READY",
90 "*** ERROR *** ",
91 };
92
93 #ifdef CONFIG_IRDA_DEBUG
94 static char *ircomm_tty_event[] = {
95 "IRCOMM_TTY_ATTACH_CABLE",
96 "IRCOMM_TTY_DETACH_CABLE",
97 "IRCOMM_TTY_DATA_REQUEST",
98 "IRCOMM_TTY_DATA_INDICATION",
99 "IRCOMM_TTY_DISCOVERY_REQUEST",
100 "IRCOMM_TTY_DISCOVERY_INDICATION",
101 "IRCOMM_TTY_CONNECT_CONFIRM",
102 "IRCOMM_TTY_CONNECT_INDICATION",
103 "IRCOMM_TTY_DISCONNECT_REQUEST",
104 "IRCOMM_TTY_DISCONNECT_INDICATION",
105 "IRCOMM_TTY_WD_TIMER_EXPIRED",
106 "IRCOMM_TTY_GOT_PARAMETERS",
107 "IRCOMM_TTY_GOT_LSAPSEL",
108 "*** ERROR ****",
109 };
110 #endif /* CONFIG_IRDA_DEBUG */
111
112 static int (*state[])(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
113 struct sk_buff *skb, struct ircomm_tty_info *info) =
114 {
115 ircomm_tty_state_idle,
116 ircomm_tty_state_search,
117 ircomm_tty_state_query_parameters,
118 ircomm_tty_state_query_lsap_sel,
119 ircomm_tty_state_setup,
120 ircomm_tty_state_ready,
121 };
122
123 /*
124 * Function ircomm_tty_attach_cable (driver)
125 *
126 * Try to attach cable (IrCOMM link). This function will only return
127 * when the link has been connected, or if an error condition occurs.
128 * If success, the return value is the resulting service type.
129 */
130 int ircomm_tty_attach_cable(struct ircomm_tty_cb *self)
131 {
132 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
133
134 IRDA_ASSERT(self != NULL, return -1;);
135 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
136
137 /* Check if somebody has already connected to us */
138 if (ircomm_is_connected(self->ircomm)) {
139 IRDA_DEBUG(0, "%s(), already connected!\n", __FUNCTION__ );
140 return 0;
141 }
142
143 /* Make sure nobody tries to write before the link is up */
144 self->tty->hw_stopped = 1;
145
146 ircomm_tty_ias_register(self);
147
148 ircomm_tty_do_event(self, IRCOMM_TTY_ATTACH_CABLE, NULL, NULL);
149
150 return 0;
151 }
152
153 /*
154 * Function ircomm_detach_cable (driver)
155 *
156 * Detach cable, or cable has been detached by peer
157 *
158 */
159 void ircomm_tty_detach_cable(struct ircomm_tty_cb *self)
160 {
161 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
162
163 IRDA_ASSERT(self != NULL, return;);
164 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
165
166 del_timer(&self->watchdog_timer);
167
168 /* Remove discovery handler */
169 if (self->ckey) {
170 irlmp_unregister_client(self->ckey);
171 self->ckey = NULL;
172 }
173 /* Remove IrCOMM hint bits */
174 if (self->skey) {
175 irlmp_unregister_service(self->skey);
176 self->skey = NULL;
177 }
178
179 if (self->iriap) {
180 iriap_close(self->iriap);
181 self->iriap = NULL;
182 }
183
184 /* Remove LM-IAS object */
185 if (self->obj) {
186 irias_delete_object(self->obj);
187 self->obj = NULL;
188 }
189
190 ircomm_tty_do_event(self, IRCOMM_TTY_DETACH_CABLE, NULL, NULL);
191
192 /* Reset some values */
193 self->daddr = self->saddr = 0;
194 self->dlsap_sel = self->slsap_sel = 0;
195
196 memset(&self->settings, 0, sizeof(struct ircomm_params));
197 }
198
199 /*
200 * Function ircomm_tty_ias_register (self)
201 *
202 * Register with LM-IAS depending on which service type we are
203 *
204 */
205 static void ircomm_tty_ias_register(struct ircomm_tty_cb *self)
206 {
207 __u8 oct_seq[6];
208 __u16 hints;
209
210 IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
211
212 IRDA_ASSERT(self != NULL, return;);
213 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
214
215 /* Compute hint bits based on service */
216 hints = irlmp_service_to_hint(S_COMM);
217 if (self->service_type & IRCOMM_3_WIRE_RAW)
218 hints |= irlmp_service_to_hint(S_PRINTER);
219
220 /* Advertise IrCOMM hint bit in discovery */
221 if (!self->skey)
222 self->skey = irlmp_register_service(hints);
223 /* Set up a discovery handler */
224 if (!self->ckey)
225 self->ckey = irlmp_register_client(hints,
226 ircomm_tty_discovery_indication,
227 NULL, (void *) self);
228
229 /* If already done, no need to do it again */
230 if (self->obj)
231 return;
232
233 if (self->service_type & IRCOMM_3_WIRE_RAW) {
234 /* Register IrLPT with LM-IAS */
235 self->obj = irias_new_object("IrLPT", IAS_IRLPT_ID);
236 irias_add_integer_attrib(self->obj, "IrDA:IrLMP:LsapSel",
237 self->slsap_sel, IAS_KERNEL_ATTR);
238 } else {
239 /* Register IrCOMM with LM-IAS */
240 self->obj = irias_new_object("IrDA:IrCOMM", IAS_IRCOMM_ID);
241 irias_add_integer_attrib(self->obj, "IrDA:TinyTP:LsapSel",
242 self->slsap_sel, IAS_KERNEL_ATTR);
243
244 /* Code the parameters into the buffer */
245 irda_param_pack(oct_seq, "bbbbbb",
246 IRCOMM_SERVICE_TYPE, 1, self->service_type,
247 IRCOMM_PORT_TYPE, 1, IRCOMM_SERIAL);
248
249 /* Register parameters with LM-IAS */
250 irias_add_octseq_attrib(self->obj, "Parameters", oct_seq, 6,
251 IAS_KERNEL_ATTR);
252 }
253 irias_insert_object(self->obj);
254 }
255
256 /*
257 * Function ircomm_tty_ias_unregister (self)
258 *
259 * Remove our IAS object and client hook while connected.
260 *
261 */
262 static void ircomm_tty_ias_unregister(struct ircomm_tty_cb *self)
263 {
264 /* Remove LM-IAS object now so it is not reused.
265 * IrCOMM deals very poorly with multiple incoming connections.
266 * It should looks a lot more like IrNET, and "dup" a server TSAP
267 * to the application TSAP (based on various rules).
268 * This is a cheap workaround allowing multiple clients to
269 * connect to us. It will not always work.
270 * Each IrCOMM socket has an IAS entry. Incoming connection will
271 * pick the first one found. So, when we are fully connected,
272 * we remove our IAS entries so that the next IAS entry is used.
273 * We do that for *both* client and server, because a server
274 * can also create client instances.
275 * Jean II */
276 if (self->obj) {
277 irias_delete_object(self->obj);
278 self->obj = NULL;
279 }
280
281 #if 0
282 /* Remove discovery handler.
283 * While we are connected, we no longer need to receive
284 * discovery events. This would be the case if there is
285 * multiple IrLAP interfaces. Jean II */
286 if (self->ckey) {
287 irlmp_unregister_client(self->ckey);
288 self->ckey = NULL;
289 }
290 #endif
291 }
292
293 /*
294 * Function ircomm_send_initial_parameters (self)
295 *
296 * Send initial parameters to the remote IrCOMM device. These parameters
297 * must be sent before any data.
298 */
299 int ircomm_tty_send_initial_parameters(struct ircomm_tty_cb *self)
300 {
301 IRDA_ASSERT(self != NULL, return -1;);
302 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
303
304 if (self->service_type & IRCOMM_3_WIRE_RAW)
305 return 0;
306
307 /*
308 * Set default values, but only if the application for some reason
309 * haven't set them already
310 */
311 IRDA_DEBUG(2, "%s(), data-rate = %d\n", __FUNCTION__ ,
312 self->settings.data_rate);
313 if (!self->settings.data_rate)
314 self->settings.data_rate = 9600;
315 IRDA_DEBUG(2, "%s(), data-format = %d\n", __FUNCTION__ ,
316 self->settings.data_format);
317 if (!self->settings.data_format)
318 self->settings.data_format = IRCOMM_WSIZE_8; /* 8N1 */
319
320 IRDA_DEBUG(2, "%s(), flow-control = %d\n", __FUNCTION__ ,
321 self->settings.flow_control);
322 /*self->settings.flow_control = IRCOMM_RTS_CTS_IN|IRCOMM_RTS_CTS_OUT;*/
323
324 /* Do not set delta values for the initial parameters */
325 self->settings.dte = IRCOMM_DTR | IRCOMM_RTS;
326
327 /* Only send service type parameter when we are the client */
328 if (self->client)
329 ircomm_param_request(self, IRCOMM_SERVICE_TYPE, FALSE);
330 ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
331 ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
332
333 /* For a 3 wire service, we just flush the last parameter and return */
334 if (self->settings.service_type == IRCOMM_3_WIRE) {
335 ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
336 return 0;
337 }
338
339 /* Only 9-wire service types continue here */
340 ircomm_param_request(self, IRCOMM_FLOW_CONTROL, FALSE);
341 #if 0
342 ircomm_param_request(self, IRCOMM_XON_XOFF, FALSE);
343 ircomm_param_request(self, IRCOMM_ENQ_ACK, FALSE);
344 #endif
345 /* Notify peer that we are ready to receive data */
346 ircomm_param_request(self, IRCOMM_DTE, TRUE);
347
348 return 0;
349 }
350
351 /*
352 * Function ircomm_tty_discovery_indication (discovery)
353 *
354 * Remote device is discovered, try query the remote IAS to see which
355 * device it is, and which services it has.
356 *
357 */
358 static void ircomm_tty_discovery_indication(discinfo_t *discovery,
359 DISCOVERY_MODE mode,
360 void *priv)
361 {
362 struct ircomm_tty_cb *self;
363 struct ircomm_tty_info info;
364
365 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
366
367 /* Important note :
368 * We need to drop all passive discoveries.
369 * The LSAP management of IrComm is deficient and doesn't deal
370 * with the case of two instance connecting to each other
371 * simultaneously (it will deadlock in LMP).
372 * The proper fix would be to use the same technique as in IrNET,
373 * to have one server socket and separate instances for the
374 * connecting/connected socket.
375 * The workaround is to drop passive discovery, which drastically
376 * reduce the probability of this happening.
377 * Jean II */
378 if(mode == DISCOVERY_PASSIVE)
379 return;
380
381 info.daddr = discovery->daddr;
382 info.saddr = discovery->saddr;
383
384 self = (struct ircomm_tty_cb *) priv;
385 ircomm_tty_do_event(self, IRCOMM_TTY_DISCOVERY_INDICATION,
386 NULL, &info);
387 }
388
389 /*
390 * Function ircomm_tty_disconnect_indication (instance, sap, reason, skb)
391 *
392 * Link disconnected
393 *
394 */
395 void ircomm_tty_disconnect_indication(void *instance, void *sap,
396 LM_REASON reason,
397 struct sk_buff *skb)
398 {
399 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
400
401 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
402
403 IRDA_ASSERT(self != NULL, return;);
404 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
405
406 if (!self->tty)
407 return;
408
409 /* This will stop control data transfers */
410 self->flow = FLOW_STOP;
411
412 /* Stop data transfers */
413 self->tty->hw_stopped = 1;
414
415 ircomm_tty_do_event(self, IRCOMM_TTY_DISCONNECT_INDICATION, NULL,
416 NULL);
417 }
418
419 /*
420 * Function ircomm_tty_getvalue_confirm (result, obj_id, value, priv)
421 *
422 * Got result from the IAS query we make
423 *
424 */
425 static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
426 struct ias_value *value,
427 void *priv)
428 {
429 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) priv;
430
431 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
432
433 IRDA_ASSERT(self != NULL, return;);
434 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
435
436 /* We probably don't need to make any more queries */
437 iriap_close(self->iriap);
438 self->iriap = NULL;
439
440 /* Check if request succeeded */
441 if (result != IAS_SUCCESS) {
442 IRDA_DEBUG(4, "%s(), got NULL value!\n", __FUNCTION__ );
443 return;
444 }
445
446 switch (value->type) {
447 case IAS_OCT_SEQ:
448 IRDA_DEBUG(2, "%s(), got octet sequence\n", __FUNCTION__ );
449
450 irda_param_extract_all(self, value->t.oct_seq, value->len,
451 &ircomm_param_info);
452
453 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_PARAMETERS, NULL,
454 NULL);
455 break;
456 case IAS_INTEGER:
457 /* Got LSAP selector */
458 IRDA_DEBUG(2, "%s(), got lsapsel = %d\n", __FUNCTION__ ,
459 value->t.integer);
460
461 if (value->t.integer == -1) {
462 IRDA_DEBUG(0, "%s(), invalid value!\n", __FUNCTION__ );
463 } else
464 self->dlsap_sel = value->t.integer;
465
466 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_LSAPSEL, NULL, NULL);
467 break;
468 case IAS_MISSING:
469 IRDA_DEBUG(0, "%s(), got IAS_MISSING\n", __FUNCTION__ );
470 break;
471 default:
472 IRDA_DEBUG(0, "%s(), got unknown type!\n", __FUNCTION__ );
473 break;
474 }
475 irias_delete_value(value);
476 }
477
478 /*
479 * Function ircomm_tty_connect_confirm (instance, sap, qos, max_sdu_size, skb)
480 *
481 * Connection confirmed
482 *
483 */
484 void ircomm_tty_connect_confirm(void *instance, void *sap,
485 struct qos_info *qos,
486 __u32 max_data_size,
487 __u8 max_header_size,
488 struct sk_buff *skb)
489 {
490 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
491
492 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
493
494 IRDA_ASSERT(self != NULL, return;);
495 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
496
497 self->client = TRUE;
498 self->max_data_size = max_data_size;
499 self->max_header_size = max_header_size;
500 self->flow = FLOW_START;
501
502 ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_CONFIRM, NULL, NULL);
503
504 /* No need to kfree_skb - see ircomm_ttp_connect_confirm() */
505 }
506
507 /*
508 * Function ircomm_tty_connect_indication (instance, sap, qos, max_sdu_size,
509 * skb)
510 *
511 * we are discovered and being requested to connect by remote device !
512 *
513 */
514 void ircomm_tty_connect_indication(void *instance, void *sap,
515 struct qos_info *qos,
516 __u32 max_data_size,
517 __u8 max_header_size,
518 struct sk_buff *skb)
519 {
520 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
521 int clen;
522
523 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
524
525 IRDA_ASSERT(self != NULL, return;);
526 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
527
528 self->client = FALSE;
529 self->max_data_size = max_data_size;
530 self->max_header_size = max_header_size;
531 self->flow = FLOW_START;
532
533 clen = skb->data[0];
534 if (clen)
535 irda_param_extract_all(self, skb->data+1,
536 IRDA_MIN(skb->len, clen),
537 &ircomm_param_info);
538
539 ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_INDICATION, NULL, NULL);
540
541 /* No need to kfree_skb - see ircomm_ttp_connect_indication() */
542 }
543
544 /*
545 * Function ircomm_tty_link_established (self)
546 *
547 * Called when the IrCOMM link is established
548 *
549 */
550 void ircomm_tty_link_established(struct ircomm_tty_cb *self)
551 {
552 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
553
554 IRDA_ASSERT(self != NULL, return;);
555 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
556
557 if (!self->tty)
558 return;
559
560 del_timer(&self->watchdog_timer);
561
562 /*
563 * IrCOMM link is now up, and if we are not using hardware
564 * flow-control, then declare the hardware as running. Otherwise we
565 * will have to wait for the peer device (DCE) to raise the CTS
566 * line.
567 */
568 if ((self->flags & ASYNC_CTS_FLOW) && ((self->settings.dce & IRCOMM_CTS) == 0)) {
569 IRDA_DEBUG(0, "%s(), waiting for CTS ...\n", __FUNCTION__ );
570 return;
571 } else {
572 IRDA_DEBUG(1, "%s(), starting hardware!\n", __FUNCTION__ );
573
574 self->tty->hw_stopped = 0;
575
576 /* Wake up processes blocked on open */
577 wake_up_interruptible(&self->open_wait);
578 }
579
580 schedule_work(&self->tqueue);
581 }
582
583 /*
584 * Function ircomm_tty_start_watchdog_timer (self, timeout)
585 *
586 * Start the watchdog timer. This timer is used to make sure that any
587 * connection attempt is successful, and if not, we will retry after
588 * the timeout
589 */
590 static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
591 int timeout)
592 {
593 IRDA_ASSERT(self != NULL, return;);
594 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
595
596 irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
597 ircomm_tty_watchdog_timer_expired);
598 }
599
600 /*
601 * Function ircomm_tty_watchdog_timer_expired (data)
602 *
603 * Called when the connect procedure have taken to much time.
604 *
605 */
606 static void ircomm_tty_watchdog_timer_expired(void *data)
607 {
608 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) data;
609
610 IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
611
612 IRDA_ASSERT(self != NULL, return;);
613 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
614
615 ircomm_tty_do_event(self, IRCOMM_TTY_WD_TIMER_EXPIRED, NULL, NULL);
616 }
617
618
619 /*
620 * Function ircomm_tty_do_event (self, event, skb)
621 *
622 * Process event
623 *
624 */
625 int ircomm_tty_do_event(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
626 struct sk_buff *skb, struct ircomm_tty_info *info)
627 {
628 IRDA_ASSERT(self != NULL, return -1;);
629 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
630
631 IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
632 ircomm_tty_state[self->state], ircomm_tty_event[event]);
633
634 return (*state[self->state])(self, event, skb, info);
635 }
636
637 /*
638 * Function ircomm_tty_next_state (self, state)
639 *
640 * Switch state
641 *
642 */
643 static inline void ircomm_tty_next_state(struct ircomm_tty_cb *self, IRCOMM_TTY_STATE state)
644 {
645 /*
646 IRDA_ASSERT(self != NULL, return;);
647 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
648
649 IRDA_DEBUG(2, "%s: next state=%s, service type=%d\n", __FUNCTION__ ,
650 ircomm_tty_state[self->state], self->service_type);
651 */
652 self->state = state;
653 }
654
655 /*
656 * Function ircomm_tty_state_idle (self, event, skb, info)
657 *
658 * Just hanging around
659 *
660 */
661 static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
662 IRCOMM_TTY_EVENT event,
663 struct sk_buff *skb,
664 struct ircomm_tty_info *info)
665 {
666 int ret = 0;
667
668 IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
669 ircomm_tty_state[self->state], ircomm_tty_event[event]);
670 switch (event) {
671 case IRCOMM_TTY_ATTACH_CABLE:
672 /* Try to discover any remote devices */
673 ircomm_tty_start_watchdog_timer(self, 3*HZ);
674 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
675
676 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
677 break;
678 case IRCOMM_TTY_DISCOVERY_INDICATION:
679 self->daddr = info->daddr;
680 self->saddr = info->saddr;
681
682 if (self->iriap) {
683 IRDA_WARNING("%s(), busy with a previous query\n",
684 __FUNCTION__);
685 return -EBUSY;
686 }
687
688 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
689 ircomm_tty_getvalue_confirm);
690
691 iriap_getvaluebyclass_request(self->iriap,
692 self->saddr, self->daddr,
693 "IrDA:IrCOMM", "Parameters");
694
695 ircomm_tty_start_watchdog_timer(self, 3*HZ);
696 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
697 break;
698 case IRCOMM_TTY_CONNECT_INDICATION:
699 del_timer(&self->watchdog_timer);
700
701 /* Accept connection */
702 ircomm_connect_response(self->ircomm, NULL);
703 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
704 break;
705 case IRCOMM_TTY_WD_TIMER_EXPIRED:
706 /* Just stay idle */
707 break;
708 case IRCOMM_TTY_DETACH_CABLE:
709 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
710 break;
711 default:
712 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
713 ircomm_tty_event[event]);
714 ret = -EINVAL;
715 }
716 return ret;
717 }
718
719 /*
720 * Function ircomm_tty_state_search (self, event, skb, info)
721 *
722 * Trying to discover an IrCOMM device
723 *
724 */
725 static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
726 IRCOMM_TTY_EVENT event,
727 struct sk_buff *skb,
728 struct ircomm_tty_info *info)
729 {
730 int ret = 0;
731
732 IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
733 ircomm_tty_state[self->state], ircomm_tty_event[event]);
734
735 switch (event) {
736 case IRCOMM_TTY_DISCOVERY_INDICATION:
737 self->daddr = info->daddr;
738 self->saddr = info->saddr;
739
740 if (self->iriap) {
741 IRDA_WARNING("%s(), busy with a previous query\n",
742 __FUNCTION__);
743 return -EBUSY;
744 }
745
746 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
747 ircomm_tty_getvalue_confirm);
748
749 if (self->service_type == IRCOMM_3_WIRE_RAW) {
750 iriap_getvaluebyclass_request(self->iriap, self->saddr,
751 self->daddr, "IrLPT",
752 "IrDA:IrLMP:LsapSel");
753 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
754 } else {
755 iriap_getvaluebyclass_request(self->iriap, self->saddr,
756 self->daddr,
757 "IrDA:IrCOMM",
758 "Parameters");
759
760 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
761 }
762 ircomm_tty_start_watchdog_timer(self, 3*HZ);
763 break;
764 case IRCOMM_TTY_CONNECT_INDICATION:
765 del_timer(&self->watchdog_timer);
766 ircomm_tty_ias_unregister(self);
767
768 /* Accept connection */
769 ircomm_connect_response(self->ircomm, NULL);
770 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
771 break;
772 case IRCOMM_TTY_WD_TIMER_EXPIRED:
773 #if 1
774 /* Give up */
775 #else
776 /* Try to discover any remote devices */
777 ircomm_tty_start_watchdog_timer(self, 3*HZ);
778 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
779 #endif
780 break;
781 case IRCOMM_TTY_DETACH_CABLE:
782 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
783 break;
784 default:
785 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
786 ircomm_tty_event[event]);
787 ret = -EINVAL;
788 }
789 return ret;
790 }
791
792 /*
793 * Function ircomm_tty_state_query (self, event, skb, info)
794 *
795 * Querying the remote LM-IAS for IrCOMM parameters
796 *
797 */
798 static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
799 IRCOMM_TTY_EVENT event,
800 struct sk_buff *skb,
801 struct ircomm_tty_info *info)
802 {
803 int ret = 0;
804
805 IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
806 ircomm_tty_state[self->state], ircomm_tty_event[event]);
807
808 switch (event) {
809 case IRCOMM_TTY_GOT_PARAMETERS:
810 if (self->iriap) {
811 IRDA_WARNING("%s(), busy with a previous query\n",
812 __FUNCTION__);
813 return -EBUSY;
814 }
815
816 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
817 ircomm_tty_getvalue_confirm);
818
819 iriap_getvaluebyclass_request(self->iriap, self->saddr,
820 self->daddr, "IrDA:IrCOMM",
821 "IrDA:TinyTP:LsapSel");
822
823 ircomm_tty_start_watchdog_timer(self, 3*HZ);
824 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
825 break;
826 case IRCOMM_TTY_WD_TIMER_EXPIRED:
827 /* Go back to search mode */
828 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
829 ircomm_tty_start_watchdog_timer(self, 3*HZ);
830 break;
831 case IRCOMM_TTY_CONNECT_INDICATION:
832 del_timer(&self->watchdog_timer);
833 ircomm_tty_ias_unregister(self);
834
835 /* Accept connection */
836 ircomm_connect_response(self->ircomm, NULL);
837 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
838 break;
839 case IRCOMM_TTY_DETACH_CABLE:
840 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
841 break;
842 default:
843 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
844 ircomm_tty_event[event]);
845 ret = -EINVAL;
846 }
847 return ret;
848 }
849
850 /*
851 * Function ircomm_tty_state_query_lsap_sel (self, event, skb, info)
852 *
853 * Query remote LM-IAS for the LSAP selector which we can connect to
854 *
855 */
856 static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
857 IRCOMM_TTY_EVENT event,
858 struct sk_buff *skb,
859 struct ircomm_tty_info *info)
860 {
861 int ret = 0;
862
863 IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
864 ircomm_tty_state[self->state], ircomm_tty_event[event]);
865
866 switch (event) {
867 case IRCOMM_TTY_GOT_LSAPSEL:
868 /* Connect to remote device */
869 ret = ircomm_connect_request(self->ircomm, self->dlsap_sel,
870 self->saddr, self->daddr,
871 NULL, self->service_type);
872 ircomm_tty_start_watchdog_timer(self, 3*HZ);
873 ircomm_tty_next_state(self, IRCOMM_TTY_SETUP);
874 break;
875 case IRCOMM_TTY_WD_TIMER_EXPIRED:
876 /* Go back to search mode */
877 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
878 ircomm_tty_start_watchdog_timer(self, 3*HZ);
879 break;
880 case IRCOMM_TTY_CONNECT_INDICATION:
881 del_timer(&self->watchdog_timer);
882 ircomm_tty_ias_unregister(self);
883
884 /* Accept connection */
885 ircomm_connect_response(self->ircomm, NULL);
886 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
887 break;
888 case IRCOMM_TTY_DETACH_CABLE:
889 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
890 break;
891 default:
892 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
893 ircomm_tty_event[event]);
894 ret = -EINVAL;
895 }
896 return ret;
897 }
898
899 /*
900 * Function ircomm_tty_state_setup (self, event, skb, info)
901 *
902 * Trying to connect
903 *
904 */
905 static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
906 IRCOMM_TTY_EVENT event,
907 struct sk_buff *skb,
908 struct ircomm_tty_info *info)
909 {
910 int ret = 0;
911
912 IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
913 ircomm_tty_state[self->state], ircomm_tty_event[event]);
914
915 switch (event) {
916 case IRCOMM_TTY_CONNECT_CONFIRM:
917 del_timer(&self->watchdog_timer);
918 ircomm_tty_ias_unregister(self);
919
920 /*
921 * Send initial parameters. This will also send out queued
922 * parameters waiting for the connection to come up
923 */
924 ircomm_tty_send_initial_parameters(self);
925 ircomm_tty_link_established(self);
926 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
927 break;
928 case IRCOMM_TTY_CONNECT_INDICATION:
929 del_timer(&self->watchdog_timer);
930 ircomm_tty_ias_unregister(self);
931
932 /* Accept connection */
933 ircomm_connect_response(self->ircomm, NULL);
934 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
935 break;
936 case IRCOMM_TTY_WD_TIMER_EXPIRED:
937 /* Go back to search mode */
938 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
939 ircomm_tty_start_watchdog_timer(self, 3*HZ);
940 break;
941 case IRCOMM_TTY_DETACH_CABLE:
942 /* ircomm_disconnect_request(self->ircomm, NULL); */
943 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
944 break;
945 default:
946 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
947 ircomm_tty_event[event]);
948 ret = -EINVAL;
949 }
950 return ret;
951 }
952
953 /*
954 * Function ircomm_tty_state_ready (self, event, skb, info)
955 *
956 * IrCOMM is now connected
957 *
958 */
959 static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
960 IRCOMM_TTY_EVENT event,
961 struct sk_buff *skb,
962 struct ircomm_tty_info *info)
963 {
964 int ret = 0;
965
966 switch (event) {
967 case IRCOMM_TTY_DATA_REQUEST:
968 ret = ircomm_data_request(self->ircomm, skb);
969 break;
970 case IRCOMM_TTY_DETACH_CABLE:
971 ircomm_disconnect_request(self->ircomm, NULL);
972 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
973 break;
974 case IRCOMM_TTY_DISCONNECT_INDICATION:
975 ircomm_tty_ias_register(self);
976 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
977 ircomm_tty_start_watchdog_timer(self, 3*HZ);
978
979 if (self->flags & ASYNC_CHECK_CD) {
980 /* Drop carrier */
981 self->settings.dce = IRCOMM_DELTA_CD;
982 ircomm_tty_check_modem_status(self);
983 } else {
984 IRDA_DEBUG(0, "%s(), hanging up!\n", __FUNCTION__ );
985 if (self->tty)
986 tty_hangup(self->tty);
987 }
988 break;
989 default:
990 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
991 ircomm_tty_event[event]);
992 ret = -EINVAL;
993 }
994 return ret;
995 }
996
997
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