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, see <http://www.gnu.org/licenses/>.
27 *
28 ********************************************************************/
29
30 #include <linux/init.h>
31 #include <linux/sched.h>
32
33 #include <net/irda/irda.h>
34 #include <net/irda/irlmp.h>
35 #include <net/irda/iriap.h>
36 #include <net/irda/irttp.h>
37 #include <net/irda/irias_object.h>
38 #include <net/irda/parameters.h>
39
40 #include <net/irda/ircomm_core.h>
41 #include <net/irda/ircomm_param.h>
42 #include <net/irda/ircomm_event.h>
43
44 #include <net/irda/ircomm_tty.h>
45 #include <net/irda/ircomm_tty_attach.h>
46
47 static void ircomm_tty_ias_register(struct ircomm_tty_cb *self);
48 static void ircomm_tty_discovery_indication(discinfo_t *discovery,
49 DISCOVERY_MODE mode,
50 void *priv);
51 static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
52 struct ias_value *value, void *priv);
53 static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
54 int timeout);
55 static void ircomm_tty_watchdog_timer_expired(void *data);
56
57 static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
58 IRCOMM_TTY_EVENT event,
59 struct sk_buff *skb,
60 struct ircomm_tty_info *info);
61 static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
62 IRCOMM_TTY_EVENT event,
63 struct sk_buff *skb,
64 struct ircomm_tty_info *info);
65 static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
66 IRCOMM_TTY_EVENT event,
67 struct sk_buff *skb,
68 struct ircomm_tty_info *info);
69 static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
70 IRCOMM_TTY_EVENT event,
71 struct sk_buff *skb,
72 struct ircomm_tty_info *info);
73 static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
74 IRCOMM_TTY_EVENT event,
75 struct sk_buff *skb,
76 struct ircomm_tty_info *info);
77 static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
78 IRCOMM_TTY_EVENT event,
79 struct sk_buff *skb,
80 struct ircomm_tty_info *info);
81
82 const char *const ircomm_tty_state[] = {
83 "IRCOMM_TTY_IDLE",
84 "IRCOMM_TTY_SEARCH",
85 "IRCOMM_TTY_QUERY_PARAMETERS",
86 "IRCOMM_TTY_QUERY_LSAP_SEL",
87 "IRCOMM_TTY_SETUP",
88 "IRCOMM_TTY_READY",
89 "*** ERROR *** ",
90 };
91
92 static const char *const ircomm_tty_event[] __maybe_unused = {
93 "IRCOMM_TTY_ATTACH_CABLE",
94 "IRCOMM_TTY_DETACH_CABLE",
95 "IRCOMM_TTY_DATA_REQUEST",
96 "IRCOMM_TTY_DATA_INDICATION",
97 "IRCOMM_TTY_DISCOVERY_REQUEST",
98 "IRCOMM_TTY_DISCOVERY_INDICATION",
99 "IRCOMM_TTY_CONNECT_CONFIRM",
100 "IRCOMM_TTY_CONNECT_INDICATION",
101 "IRCOMM_TTY_DISCONNECT_REQUEST",
102 "IRCOMM_TTY_DISCONNECT_INDICATION",
103 "IRCOMM_TTY_WD_TIMER_EXPIRED",
104 "IRCOMM_TTY_GOT_PARAMETERS",
105 "IRCOMM_TTY_GOT_LSAPSEL",
106 "*** ERROR ****",
107 };
108
109 static int (*state[])(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
110 struct sk_buff *skb, struct ircomm_tty_info *info) =
111 {
112 ircomm_tty_state_idle,
113 ircomm_tty_state_search,
114 ircomm_tty_state_query_parameters,
115 ircomm_tty_state_query_lsap_sel,
116 ircomm_tty_state_setup,
117 ircomm_tty_state_ready,
118 };
119
120 /*
121 * Function ircomm_tty_attach_cable (driver)
122 *
123 * Try to attach cable (IrCOMM link). This function will only return
124 * when the link has been connected, or if an error condition occurs.
125 * If success, the return value is the resulting service type.
126 */
ircomm_tty_attach_cable(struct ircomm_tty_cb * self)127 int ircomm_tty_attach_cable(struct ircomm_tty_cb *self)
128 {
129 struct tty_struct *tty;
130
131 IRDA_ASSERT(self != NULL, return -1;);
132 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
133
134 /* Check if somebody has already connected to us */
135 if (ircomm_is_connected(self->ircomm)) {
136 pr_debug("%s(), already connected!\n", __func__);
137 return 0;
138 }
139
140 /* Make sure nobody tries to write before the link is up */
141 tty = tty_port_tty_get(&self->port);
142 if (tty) {
143 tty->hw_stopped = 1;
144 tty_kref_put(tty);
145 }
146
147 ircomm_tty_ias_register(self);
148
149 ircomm_tty_do_event(self, IRCOMM_TTY_ATTACH_CABLE, NULL, NULL);
150
151 return 0;
152 }
153
154 /*
155 * Function ircomm_detach_cable (driver)
156 *
157 * Detach cable, or cable has been detached by peer
158 *
159 */
ircomm_tty_detach_cable(struct ircomm_tty_cb * self)160 void ircomm_tty_detach_cable(struct ircomm_tty_cb *self)
161 {
162 IRDA_ASSERT(self != NULL, return;);
163 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
164
165 del_timer(&self->watchdog_timer);
166
167 /* Remove discovery handler */
168 if (self->ckey) {
169 irlmp_unregister_client(self->ckey);
170 self->ckey = NULL;
171 }
172 /* Remove IrCOMM hint bits */
173 if (self->skey) {
174 irlmp_unregister_service(self->skey);
175 self->skey = NULL;
176 }
177
178 if (self->iriap) {
179 iriap_close(self->iriap);
180 self->iriap = NULL;
181 }
182
183 /* Remove LM-IAS object */
184 if (self->obj) {
185 irias_delete_object(self->obj);
186 self->obj = NULL;
187 }
188
189 ircomm_tty_do_event(self, IRCOMM_TTY_DETACH_CABLE, NULL, NULL);
190
191 /* Reset some values */
192 self->daddr = self->saddr = 0;
193 self->dlsap_sel = self->slsap_sel = 0;
194
195 memset(&self->settings, 0, sizeof(struct ircomm_params));
196 }
197
198 /*
199 * Function ircomm_tty_ias_register (self)
200 *
201 * Register with LM-IAS depending on which service type we are
202 *
203 */
ircomm_tty_ias_register(struct ircomm_tty_cb * self)204 static void ircomm_tty_ias_register(struct ircomm_tty_cb *self)
205 {
206 __u8 oct_seq[6];
207 __u16 hints;
208
209 IRDA_ASSERT(self != NULL, return;);
210 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
211
212 /* Compute hint bits based on service */
213 hints = irlmp_service_to_hint(S_COMM);
214 if (self->service_type & IRCOMM_3_WIRE_RAW)
215 hints |= irlmp_service_to_hint(S_PRINTER);
216
217 /* Advertise IrCOMM hint bit in discovery */
218 if (!self->skey)
219 self->skey = irlmp_register_service(hints);
220 /* Set up a discovery handler */
221 if (!self->ckey)
222 self->ckey = irlmp_register_client(hints,
223 ircomm_tty_discovery_indication,
224 NULL, (void *) self);
225
226 /* If already done, no need to do it again */
227 if (self->obj)
228 return;
229
230 if (self->service_type & IRCOMM_3_WIRE_RAW) {
231 /* Register IrLPT with LM-IAS */
232 self->obj = irias_new_object("IrLPT", IAS_IRLPT_ID);
233 irias_add_integer_attrib(self->obj, "IrDA:IrLMP:LsapSel",
234 self->slsap_sel, IAS_KERNEL_ATTR);
235 } else {
236 /* Register IrCOMM with LM-IAS */
237 self->obj = irias_new_object("IrDA:IrCOMM", IAS_IRCOMM_ID);
238 irias_add_integer_attrib(self->obj, "IrDA:TinyTP:LsapSel",
239 self->slsap_sel, IAS_KERNEL_ATTR);
240
241 /* Code the parameters into the buffer */
242 irda_param_pack(oct_seq, "bbbbbb",
243 IRCOMM_SERVICE_TYPE, 1, self->service_type,
244 IRCOMM_PORT_TYPE, 1, IRCOMM_SERIAL);
245
246 /* Register parameters with LM-IAS */
247 irias_add_octseq_attrib(self->obj, "Parameters", oct_seq, 6,
248 IAS_KERNEL_ATTR);
249 }
250 irias_insert_object(self->obj);
251 }
252
253 /*
254 * Function ircomm_tty_ias_unregister (self)
255 *
256 * Remove our IAS object and client hook while connected.
257 *
258 */
ircomm_tty_ias_unregister(struct ircomm_tty_cb * self)259 static void ircomm_tty_ias_unregister(struct ircomm_tty_cb *self)
260 {
261 /* Remove LM-IAS object now so it is not reused.
262 * IrCOMM deals very poorly with multiple incoming connections.
263 * It should looks a lot more like IrNET, and "dup" a server TSAP
264 * to the application TSAP (based on various rules).
265 * This is a cheap workaround allowing multiple clients to
266 * connect to us. It will not always work.
267 * Each IrCOMM socket has an IAS entry. Incoming connection will
268 * pick the first one found. So, when we are fully connected,
269 * we remove our IAS entries so that the next IAS entry is used.
270 * We do that for *both* client and server, because a server
271 * can also create client instances.
272 * Jean II */
273 if (self->obj) {
274 irias_delete_object(self->obj);
275 self->obj = NULL;
276 }
277
278 #if 0
279 /* Remove discovery handler.
280 * While we are connected, we no longer need to receive
281 * discovery events. This would be the case if there is
282 * multiple IrLAP interfaces. Jean II */
283 if (self->ckey) {
284 irlmp_unregister_client(self->ckey);
285 self->ckey = NULL;
286 }
287 #endif
288 }
289
290 /*
291 * Function ircomm_send_initial_parameters (self)
292 *
293 * Send initial parameters to the remote IrCOMM device. These parameters
294 * must be sent before any data.
295 */
ircomm_tty_send_initial_parameters(struct ircomm_tty_cb * self)296 int ircomm_tty_send_initial_parameters(struct ircomm_tty_cb *self)
297 {
298 IRDA_ASSERT(self != NULL, return -1;);
299 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
300
301 if (self->service_type & IRCOMM_3_WIRE_RAW)
302 return 0;
303
304 /*
305 * Set default values, but only if the application for some reason
306 * haven't set them already
307 */
308 pr_debug("%s(), data-rate = %d\n", __func__ ,
309 self->settings.data_rate);
310 if (!self->settings.data_rate)
311 self->settings.data_rate = 9600;
312 pr_debug("%s(), data-format = %d\n", __func__ ,
313 self->settings.data_format);
314 if (!self->settings.data_format)
315 self->settings.data_format = IRCOMM_WSIZE_8; /* 8N1 */
316
317 pr_debug("%s(), flow-control = %d\n", __func__ ,
318 self->settings.flow_control);
319 /*self->settings.flow_control = IRCOMM_RTS_CTS_IN|IRCOMM_RTS_CTS_OUT;*/
320
321 /* Do not set delta values for the initial parameters */
322 self->settings.dte = IRCOMM_DTR | IRCOMM_RTS;
323
324 /* Only send service type parameter when we are the client */
325 if (self->client)
326 ircomm_param_request(self, IRCOMM_SERVICE_TYPE, FALSE);
327 ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
328 ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
329
330 /* For a 3 wire service, we just flush the last parameter and return */
331 if (self->settings.service_type == IRCOMM_3_WIRE) {
332 ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
333 return 0;
334 }
335
336 /* Only 9-wire service types continue here */
337 ircomm_param_request(self, IRCOMM_FLOW_CONTROL, FALSE);
338 #if 0
339 ircomm_param_request(self, IRCOMM_XON_XOFF, FALSE);
340 ircomm_param_request(self, IRCOMM_ENQ_ACK, FALSE);
341 #endif
342 /* Notify peer that we are ready to receive data */
343 ircomm_param_request(self, IRCOMM_DTE, TRUE);
344
345 return 0;
346 }
347
348 /*
349 * Function ircomm_tty_discovery_indication (discovery)
350 *
351 * Remote device is discovered, try query the remote IAS to see which
352 * device it is, and which services it has.
353 *
354 */
ircomm_tty_discovery_indication(discinfo_t * discovery,DISCOVERY_MODE mode,void * priv)355 static void ircomm_tty_discovery_indication(discinfo_t *discovery,
356 DISCOVERY_MODE mode,
357 void *priv)
358 {
359 struct ircomm_tty_cb *self;
360 struct ircomm_tty_info info;
361
362 /* Important note :
363 * We need to drop all passive discoveries.
364 * The LSAP management of IrComm is deficient and doesn't deal
365 * with the case of two instance connecting to each other
366 * simultaneously (it will deadlock in LMP).
367 * The proper fix would be to use the same technique as in IrNET,
368 * to have one server socket and separate instances for the
369 * connecting/connected socket.
370 * The workaround is to drop passive discovery, which drastically
371 * reduce the probability of this happening.
372 * Jean II */
373 if(mode == DISCOVERY_PASSIVE)
374 return;
375
376 info.daddr = discovery->daddr;
377 info.saddr = discovery->saddr;
378
379 self = priv;
380 ircomm_tty_do_event(self, IRCOMM_TTY_DISCOVERY_INDICATION,
381 NULL, &info);
382 }
383
384 /*
385 * Function ircomm_tty_disconnect_indication (instance, sap, reason, skb)
386 *
387 * Link disconnected
388 *
389 */
ircomm_tty_disconnect_indication(void * instance,void * sap,LM_REASON reason,struct sk_buff * skb)390 void ircomm_tty_disconnect_indication(void *instance, void *sap,
391 LM_REASON reason,
392 struct sk_buff *skb)
393 {
394 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
395 struct tty_struct *tty;
396
397 IRDA_ASSERT(self != NULL, return;);
398 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
399
400 tty = tty_port_tty_get(&self->port);
401 if (!tty)
402 return;
403
404 /* This will stop control data transfers */
405 self->flow = FLOW_STOP;
406
407 /* Stop data transfers */
408 tty->hw_stopped = 1;
409
410 ircomm_tty_do_event(self, IRCOMM_TTY_DISCONNECT_INDICATION, NULL,
411 NULL);
412 tty_kref_put(tty);
413 }
414
415 /*
416 * Function ircomm_tty_getvalue_confirm (result, obj_id, value, priv)
417 *
418 * Got result from the IAS query we make
419 *
420 */
ircomm_tty_getvalue_confirm(int result,__u16 obj_id,struct ias_value * value,void * priv)421 static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
422 struct ias_value *value,
423 void *priv)
424 {
425 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) priv;
426
427 IRDA_ASSERT(self != NULL, return;);
428 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
429
430 /* We probably don't need to make any more queries */
431 iriap_close(self->iriap);
432 self->iriap = NULL;
433
434 /* Check if request succeeded */
435 if (result != IAS_SUCCESS) {
436 pr_debug("%s(), got NULL value!\n", __func__);
437 return;
438 }
439
440 switch (value->type) {
441 case IAS_OCT_SEQ:
442 pr_debug("%s(), got octet sequence\n", __func__);
443
444 irda_param_extract_all(self, value->t.oct_seq, value->len,
445 &ircomm_param_info);
446
447 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_PARAMETERS, NULL,
448 NULL);
449 break;
450 case IAS_INTEGER:
451 /* Got LSAP selector */
452 pr_debug("%s(), got lsapsel = %d\n", __func__ ,
453 value->t.integer);
454
455 if (value->t.integer == -1) {
456 pr_debug("%s(), invalid value!\n", __func__);
457 } else
458 self->dlsap_sel = value->t.integer;
459
460 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_LSAPSEL, NULL, NULL);
461 break;
462 case IAS_MISSING:
463 pr_debug("%s(), got IAS_MISSING\n", __func__);
464 break;
465 default:
466 pr_debug("%s(), got unknown type!\n", __func__);
467 break;
468 }
469 irias_delete_value(value);
470 }
471
472 /*
473 * Function ircomm_tty_connect_confirm (instance, sap, qos, max_sdu_size, skb)
474 *
475 * Connection confirmed
476 *
477 */
ircomm_tty_connect_confirm(void * instance,void * sap,struct qos_info * qos,__u32 max_data_size,__u8 max_header_size,struct sk_buff * skb)478 void ircomm_tty_connect_confirm(void *instance, void *sap,
479 struct qos_info *qos,
480 __u32 max_data_size,
481 __u8 max_header_size,
482 struct sk_buff *skb)
483 {
484 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
485
486 IRDA_ASSERT(self != NULL, return;);
487 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
488
489 self->client = TRUE;
490 self->max_data_size = max_data_size;
491 self->max_header_size = max_header_size;
492 self->flow = FLOW_START;
493
494 ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_CONFIRM, NULL, NULL);
495
496 /* No need to kfree_skb - see ircomm_ttp_connect_confirm() */
497 }
498
499 /*
500 * Function ircomm_tty_connect_indication (instance, sap, qos, max_sdu_size,
501 * skb)
502 *
503 * we are discovered and being requested to connect by remote device !
504 *
505 */
ircomm_tty_connect_indication(void * instance,void * sap,struct qos_info * qos,__u32 max_data_size,__u8 max_header_size,struct sk_buff * skb)506 void ircomm_tty_connect_indication(void *instance, void *sap,
507 struct qos_info *qos,
508 __u32 max_data_size,
509 __u8 max_header_size,
510 struct sk_buff *skb)
511 {
512 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
513 int clen;
514
515 IRDA_ASSERT(self != NULL, return;);
516 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
517
518 self->client = FALSE;
519 self->max_data_size = max_data_size;
520 self->max_header_size = max_header_size;
521 self->flow = FLOW_START;
522
523 clen = skb->data[0];
524 if (clen)
525 irda_param_extract_all(self, skb->data+1,
526 IRDA_MIN(skb->len, clen),
527 &ircomm_param_info);
528
529 ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_INDICATION, NULL, NULL);
530
531 /* No need to kfree_skb - see ircomm_ttp_connect_indication() */
532 }
533
534 /*
535 * Function ircomm_tty_link_established (self)
536 *
537 * Called when the IrCOMM link is established
538 *
539 */
ircomm_tty_link_established(struct ircomm_tty_cb * self)540 void ircomm_tty_link_established(struct ircomm_tty_cb *self)
541 {
542 struct tty_struct *tty;
543
544 IRDA_ASSERT(self != NULL, return;);
545 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
546
547 tty = tty_port_tty_get(&self->port);
548 if (!tty)
549 return;
550
551 del_timer(&self->watchdog_timer);
552
553 /*
554 * IrCOMM link is now up, and if we are not using hardware
555 * flow-control, then declare the hardware as running. Otherwise we
556 * will have to wait for the peer device (DCE) to raise the CTS
557 * line.
558 */
559 if (tty_port_cts_enabled(&self->port) &&
560 ((self->settings.dce & IRCOMM_CTS) == 0)) {
561 pr_debug("%s(), waiting for CTS ...\n", __func__);
562 goto put;
563 } else {
564 pr_debug("%s(), starting hardware!\n", __func__);
565
566 tty->hw_stopped = 0;
567
568 /* Wake up processes blocked on open */
569 wake_up_interruptible(&self->port.open_wait);
570 }
571
572 schedule_work(&self->tqueue);
573 put:
574 tty_kref_put(tty);
575 }
576
577 /*
578 * Function ircomm_tty_start_watchdog_timer (self, timeout)
579 *
580 * Start the watchdog timer. This timer is used to make sure that any
581 * connection attempt is successful, and if not, we will retry after
582 * the timeout
583 */
ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb * self,int timeout)584 static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
585 int timeout)
586 {
587 IRDA_ASSERT(self != NULL, return;);
588 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
589
590 irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
591 ircomm_tty_watchdog_timer_expired);
592 }
593
594 /*
595 * Function ircomm_tty_watchdog_timer_expired (data)
596 *
597 * Called when the connect procedure have taken to much time.
598 *
599 */
ircomm_tty_watchdog_timer_expired(void * data)600 static void ircomm_tty_watchdog_timer_expired(void *data)
601 {
602 struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) data;
603
604 IRDA_ASSERT(self != NULL, return;);
605 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
606
607 ircomm_tty_do_event(self, IRCOMM_TTY_WD_TIMER_EXPIRED, NULL, NULL);
608 }
609
610
611 /*
612 * Function ircomm_tty_do_event (self, event, skb)
613 *
614 * Process event
615 *
616 */
ircomm_tty_do_event(struct ircomm_tty_cb * self,IRCOMM_TTY_EVENT event,struct sk_buff * skb,struct ircomm_tty_info * info)617 int ircomm_tty_do_event(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
618 struct sk_buff *skb, struct ircomm_tty_info *info)
619 {
620 IRDA_ASSERT(self != NULL, return -1;);
621 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
622
623 pr_debug("%s: state=%s, event=%s\n", __func__ ,
624 ircomm_tty_state[self->state], ircomm_tty_event[event]);
625
626 return (*state[self->state])(self, event, skb, info);
627 }
628
629 /*
630 * Function ircomm_tty_next_state (self, state)
631 *
632 * Switch state
633 *
634 */
ircomm_tty_next_state(struct ircomm_tty_cb * self,IRCOMM_TTY_STATE state)635 static inline void ircomm_tty_next_state(struct ircomm_tty_cb *self, IRCOMM_TTY_STATE state)
636 {
637 /*
638 IRDA_ASSERT(self != NULL, return;);
639 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
640
641 pr_debug("%s: next state=%s, service type=%d\n", __func__ ,
642 ircomm_tty_state[self->state], self->service_type);
643 */
644 self->state = state;
645 }
646
647 /*
648 * Function ircomm_tty_state_idle (self, event, skb, info)
649 *
650 * Just hanging around
651 *
652 */
ircomm_tty_state_idle(struct ircomm_tty_cb * self,IRCOMM_TTY_EVENT event,struct sk_buff * skb,struct ircomm_tty_info * info)653 static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
654 IRCOMM_TTY_EVENT event,
655 struct sk_buff *skb,
656 struct ircomm_tty_info *info)
657 {
658 int ret = 0;
659
660 pr_debug("%s: state=%s, event=%s\n", __func__ ,
661 ircomm_tty_state[self->state], ircomm_tty_event[event]);
662 switch (event) {
663 case IRCOMM_TTY_ATTACH_CABLE:
664 /* Try to discover any remote devices */
665 ircomm_tty_start_watchdog_timer(self, 3*HZ);
666 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
667
668 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
669 break;
670 case IRCOMM_TTY_DISCOVERY_INDICATION:
671 self->daddr = info->daddr;
672 self->saddr = info->saddr;
673
674 if (self->iriap) {
675 net_warn_ratelimited("%s(), busy with a previous query\n",
676 __func__);
677 return -EBUSY;
678 }
679
680 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
681 ircomm_tty_getvalue_confirm);
682
683 iriap_getvaluebyclass_request(self->iriap,
684 self->saddr, self->daddr,
685 "IrDA:IrCOMM", "Parameters");
686
687 ircomm_tty_start_watchdog_timer(self, 3*HZ);
688 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
689 break;
690 case IRCOMM_TTY_CONNECT_INDICATION:
691 del_timer(&self->watchdog_timer);
692
693 /* Accept connection */
694 ircomm_connect_response(self->ircomm, NULL);
695 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
696 break;
697 case IRCOMM_TTY_WD_TIMER_EXPIRED:
698 /* Just stay idle */
699 break;
700 case IRCOMM_TTY_DETACH_CABLE:
701 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
702 break;
703 default:
704 pr_debug("%s(), unknown event: %s\n", __func__ ,
705 ircomm_tty_event[event]);
706 ret = -EINVAL;
707 }
708 return ret;
709 }
710
711 /*
712 * Function ircomm_tty_state_search (self, event, skb, info)
713 *
714 * Trying to discover an IrCOMM device
715 *
716 */
ircomm_tty_state_search(struct ircomm_tty_cb * self,IRCOMM_TTY_EVENT event,struct sk_buff * skb,struct ircomm_tty_info * info)717 static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
718 IRCOMM_TTY_EVENT event,
719 struct sk_buff *skb,
720 struct ircomm_tty_info *info)
721 {
722 int ret = 0;
723
724 pr_debug("%s: state=%s, event=%s\n", __func__ ,
725 ircomm_tty_state[self->state], ircomm_tty_event[event]);
726
727 switch (event) {
728 case IRCOMM_TTY_DISCOVERY_INDICATION:
729 self->daddr = info->daddr;
730 self->saddr = info->saddr;
731
732 if (self->iriap) {
733 net_warn_ratelimited("%s(), busy with a previous query\n",
734 __func__);
735 return -EBUSY;
736 }
737
738 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
739 ircomm_tty_getvalue_confirm);
740
741 if (self->service_type == IRCOMM_3_WIRE_RAW) {
742 iriap_getvaluebyclass_request(self->iriap, self->saddr,
743 self->daddr, "IrLPT",
744 "IrDA:IrLMP:LsapSel");
745 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
746 } else {
747 iriap_getvaluebyclass_request(self->iriap, self->saddr,
748 self->daddr,
749 "IrDA:IrCOMM",
750 "Parameters");
751
752 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
753 }
754 ircomm_tty_start_watchdog_timer(self, 3*HZ);
755 break;
756 case IRCOMM_TTY_CONNECT_INDICATION:
757 del_timer(&self->watchdog_timer);
758 ircomm_tty_ias_unregister(self);
759
760 /* Accept connection */
761 ircomm_connect_response(self->ircomm, NULL);
762 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
763 break;
764 case IRCOMM_TTY_WD_TIMER_EXPIRED:
765 #if 1
766 /* Give up */
767 #else
768 /* Try to discover any remote devices */
769 ircomm_tty_start_watchdog_timer(self, 3*HZ);
770 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
771 #endif
772 break;
773 case IRCOMM_TTY_DETACH_CABLE:
774 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
775 break;
776 default:
777 pr_debug("%s(), unknown event: %s\n", __func__ ,
778 ircomm_tty_event[event]);
779 ret = -EINVAL;
780 }
781 return ret;
782 }
783
784 /*
785 * Function ircomm_tty_state_query (self, event, skb, info)
786 *
787 * Querying the remote LM-IAS for IrCOMM parameters
788 *
789 */
ircomm_tty_state_query_parameters(struct ircomm_tty_cb * self,IRCOMM_TTY_EVENT event,struct sk_buff * skb,struct ircomm_tty_info * info)790 static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
791 IRCOMM_TTY_EVENT event,
792 struct sk_buff *skb,
793 struct ircomm_tty_info *info)
794 {
795 int ret = 0;
796
797 pr_debug("%s: state=%s, event=%s\n", __func__ ,
798 ircomm_tty_state[self->state], ircomm_tty_event[event]);
799
800 switch (event) {
801 case IRCOMM_TTY_GOT_PARAMETERS:
802 if (self->iriap) {
803 net_warn_ratelimited("%s(), busy with a previous query\n",
804 __func__);
805 return -EBUSY;
806 }
807
808 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
809 ircomm_tty_getvalue_confirm);
810
811 iriap_getvaluebyclass_request(self->iriap, self->saddr,
812 self->daddr, "IrDA:IrCOMM",
813 "IrDA:TinyTP:LsapSel");
814
815 ircomm_tty_start_watchdog_timer(self, 3*HZ);
816 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
817 break;
818 case IRCOMM_TTY_WD_TIMER_EXPIRED:
819 /* Go back to search mode */
820 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
821 ircomm_tty_start_watchdog_timer(self, 3*HZ);
822 break;
823 case IRCOMM_TTY_CONNECT_INDICATION:
824 del_timer(&self->watchdog_timer);
825 ircomm_tty_ias_unregister(self);
826
827 /* Accept connection */
828 ircomm_connect_response(self->ircomm, NULL);
829 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
830 break;
831 case IRCOMM_TTY_DETACH_CABLE:
832 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
833 break;
834 default:
835 pr_debug("%s(), unknown event: %s\n", __func__ ,
836 ircomm_tty_event[event]);
837 ret = -EINVAL;
838 }
839 return ret;
840 }
841
842 /*
843 * Function ircomm_tty_state_query_lsap_sel (self, event, skb, info)
844 *
845 * Query remote LM-IAS for the LSAP selector which we can connect to
846 *
847 */
ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb * self,IRCOMM_TTY_EVENT event,struct sk_buff * skb,struct ircomm_tty_info * info)848 static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
849 IRCOMM_TTY_EVENT event,
850 struct sk_buff *skb,
851 struct ircomm_tty_info *info)
852 {
853 int ret = 0;
854
855 pr_debug("%s: state=%s, event=%s\n", __func__ ,
856 ircomm_tty_state[self->state], ircomm_tty_event[event]);
857
858 switch (event) {
859 case IRCOMM_TTY_GOT_LSAPSEL:
860 /* Connect to remote device */
861 ret = ircomm_connect_request(self->ircomm, self->dlsap_sel,
862 self->saddr, self->daddr,
863 NULL, self->service_type);
864 ircomm_tty_start_watchdog_timer(self, 3*HZ);
865 ircomm_tty_next_state(self, IRCOMM_TTY_SETUP);
866 break;
867 case IRCOMM_TTY_WD_TIMER_EXPIRED:
868 /* Go back to search mode */
869 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
870 ircomm_tty_start_watchdog_timer(self, 3*HZ);
871 break;
872 case IRCOMM_TTY_CONNECT_INDICATION:
873 del_timer(&self->watchdog_timer);
874 ircomm_tty_ias_unregister(self);
875
876 /* Accept connection */
877 ircomm_connect_response(self->ircomm, NULL);
878 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
879 break;
880 case IRCOMM_TTY_DETACH_CABLE:
881 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
882 break;
883 default:
884 pr_debug("%s(), unknown event: %s\n", __func__ ,
885 ircomm_tty_event[event]);
886 ret = -EINVAL;
887 }
888 return ret;
889 }
890
891 /*
892 * Function ircomm_tty_state_setup (self, event, skb, info)
893 *
894 * Trying to connect
895 *
896 */
ircomm_tty_state_setup(struct ircomm_tty_cb * self,IRCOMM_TTY_EVENT event,struct sk_buff * skb,struct ircomm_tty_info * info)897 static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
898 IRCOMM_TTY_EVENT event,
899 struct sk_buff *skb,
900 struct ircomm_tty_info *info)
901 {
902 int ret = 0;
903
904 pr_debug("%s: state=%s, event=%s\n", __func__ ,
905 ircomm_tty_state[self->state], ircomm_tty_event[event]);
906
907 switch (event) {
908 case IRCOMM_TTY_CONNECT_CONFIRM:
909 del_timer(&self->watchdog_timer);
910 ircomm_tty_ias_unregister(self);
911
912 /*
913 * Send initial parameters. This will also send out queued
914 * parameters waiting for the connection to come up
915 */
916 ircomm_tty_send_initial_parameters(self);
917 ircomm_tty_link_established(self);
918 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
919 break;
920 case IRCOMM_TTY_CONNECT_INDICATION:
921 del_timer(&self->watchdog_timer);
922 ircomm_tty_ias_unregister(self);
923
924 /* Accept connection */
925 ircomm_connect_response(self->ircomm, NULL);
926 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
927 break;
928 case IRCOMM_TTY_WD_TIMER_EXPIRED:
929 /* Go back to search mode */
930 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
931 ircomm_tty_start_watchdog_timer(self, 3*HZ);
932 break;
933 case IRCOMM_TTY_DETACH_CABLE:
934 /* ircomm_disconnect_request(self->ircomm, NULL); */
935 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
936 break;
937 default:
938 pr_debug("%s(), unknown event: %s\n", __func__ ,
939 ircomm_tty_event[event]);
940 ret = -EINVAL;
941 }
942 return ret;
943 }
944
945 /*
946 * Function ircomm_tty_state_ready (self, event, skb, info)
947 *
948 * IrCOMM is now connected
949 *
950 */
ircomm_tty_state_ready(struct ircomm_tty_cb * self,IRCOMM_TTY_EVENT event,struct sk_buff * skb,struct ircomm_tty_info * info)951 static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
952 IRCOMM_TTY_EVENT event,
953 struct sk_buff *skb,
954 struct ircomm_tty_info *info)
955 {
956 int ret = 0;
957
958 switch (event) {
959 case IRCOMM_TTY_DATA_REQUEST:
960 ret = ircomm_data_request(self->ircomm, skb);
961 break;
962 case IRCOMM_TTY_DETACH_CABLE:
963 ircomm_disconnect_request(self->ircomm, NULL);
964 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
965 break;
966 case IRCOMM_TTY_DISCONNECT_INDICATION:
967 ircomm_tty_ias_register(self);
968 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
969 ircomm_tty_start_watchdog_timer(self, 3*HZ);
970
971 if (self->port.flags & ASYNC_CHECK_CD) {
972 /* Drop carrier */
973 self->settings.dce = IRCOMM_DELTA_CD;
974 ircomm_tty_check_modem_status(self);
975 } else {
976 pr_debug("%s(), hanging up!\n", __func__);
977 tty_port_tty_hangup(&self->port, false);
978 }
979 break;
980 default:
981 pr_debug("%s(), unknown event: %s\n", __func__ ,
982 ircomm_tty_event[event]);
983 ret = -EINVAL;
984 }
985 return ret;
986 }
987
988