net/irda/ircomm/ircomm_tty_attach.c

   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 #include <linux/sched.h>
  34
  35 #include <net/irda/irda.h>
  36 #include <net/irda/irlmp.h>
  37 #include <net/irda/iriap.h>
  38 #include <net/irda/irttp.h>
  39 #include <net/irda/irias_object.h>
  40 #include <net/irda/parameters.h>
  41
  42 #include <net/irda/ircomm_core.h>
  43 #include <net/irda/ircomm_param.h>
  44 #include <net/irda/ircomm_event.h>
  45
  46 #include <net/irda/ircomm_tty.h>
  47 #include <net/irda/ircomm_tty_attach.h>
  48
  49 static void ircomm_tty_ias_register(struct ircomm_tty_cb *self);
  50 static void ircomm_tty_discovery_indication(discinfo_t *discovery,
  51                                             DISCOVERY_MODE mode,
  52                                             void *priv);
  53 static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
  54                                         struct ias_value *value, void *priv);
  55 static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
  56                                             int timeout);
  57 static void ircomm_tty_watchdog_timer_expired(void *data);
  58
  59 static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
  60                                  IRCOMM_TTY_EVENT event,
  61                                  struct sk_buff *skb,
  62                                  struct ircomm_tty_info *info);
  63 static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
  64                                    IRCOMM_TTY_EVENT event,
  65                                    struct sk_buff *skb,
  66                                    struct ircomm_tty_info *info);
  67 static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
  68                                              IRCOMM_TTY_EVENT event,
  69                                              struct sk_buff *skb,
  70                                              struct ircomm_tty_info *info);
  71 static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
  72                                            IRCOMM_TTY_EVENT event,
  73                                            struct sk_buff *skb,
  74                                            struct ircomm_tty_info *info);
  75 static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
  76                                   IRCOMM_TTY_EVENT event,
  77                                   struct sk_buff *skb,
  78                                   struct ircomm_tty_info *info);
  79 static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
  80                                   IRCOMM_TTY_EVENT event,
  81                                   struct sk_buff *skb,
  82                                   struct ircomm_tty_info *info);
  83
  84 const char *const ircomm_tty_state[] = {
  85         "IRCOMM_TTY_IDLE",
  86         "IRCOMM_TTY_SEARCH",
  87         "IRCOMM_TTY_QUERY_PARAMETERS",
  88         "IRCOMM_TTY_QUERY_LSAP_SEL",
  89         "IRCOMM_TTY_SETUP",
  90         "IRCOMM_TTY_READY",
  91         "*** ERROR *** ",
  92 };
  93
  94 #ifdef CONFIG_IRDA_DEBUG
  95 static const char *const ircomm_tty_event[] = {
  96         "IRCOMM_TTY_ATTACH_CABLE",
  97         "IRCOMM_TTY_DETACH_CABLE",
  98         "IRCOMM_TTY_DATA_REQUEST",
  99         "IRCOMM_TTY_DATA_INDICATION",
 100         "IRCOMM_TTY_DISCOVERY_REQUEST",
 101         "IRCOMM_TTY_DISCOVERY_INDICATION",
 102         "IRCOMM_TTY_CONNECT_CONFIRM",
 103         "IRCOMM_TTY_CONNECT_INDICATION",
 104         "IRCOMM_TTY_DISCONNECT_REQUEST",
 105         "IRCOMM_TTY_DISCONNECT_INDICATION",
 106         "IRCOMM_TTY_WD_TIMER_EXPIRED",
 107         "IRCOMM_TTY_GOT_PARAMETERS",
 108         "IRCOMM_TTY_GOT_LSAPSEL",
 109         "*** ERROR ****",
 110 };
 111 #endif /* CONFIG_IRDA_DEBUG */
 112
 113 static int (*state[])(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
 114                       struct sk_buff *skb, struct ircomm_tty_info *info) =
 115 {
 116         ircomm_tty_state_idle,
 117         ircomm_tty_state_search,
 118         ircomm_tty_state_query_parameters,
 119         ircomm_tty_state_query_lsap_sel,
 120         ircomm_tty_state_setup,
 121         ircomm_tty_state_ready,
 122 };
 123
 124 /*
 125  * Function ircomm_tty_attach_cable (driver)
 126  *
 127  *    Try to attach cable (IrCOMM link). This function will only return
 128  *    when the link has been connected, or if an error condition occurs.
 129  *    If success, the return value is the resulting service type.
 130  */
 131 int ircomm_tty_attach_cable(struct ircomm_tty_cb *self)
 132 {
 133         IRDA_DEBUG(0, "%s()\n", __func__ );
 134
 135         IRDA_ASSERT(self != NULL, return -1;);
 136         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 137
 138         /* Check if somebody has already connected to us */
 139         if (ircomm_is_connected(self->ircomm)) {
 140                 IRDA_DEBUG(0, "%s(), already connected!\n", __func__ );
 141                 return 0;
 142         }
 143
 144         /* Make sure nobody tries to write before the link is up */
 145         self->tty->hw_stopped = 1;
 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  */
 160 void ircomm_tty_detach_cable(struct ircomm_tty_cb *self)
 161 {
 162         IRDA_DEBUG(0, "%s()\n", __func__ );
 163
 164         IRDA_ASSERT(self != NULL, return;);
 165         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 166
 167         del_timer(&self->watchdog_timer);
 168
 169         /* Remove discovery handler */
 170         if (self->ckey) {
 171                 irlmp_unregister_client(self->ckey);
 172                 self->ckey = NULL;
 173         }
 174         /* Remove IrCOMM hint bits */
 175         if (self->skey) {
 176                 irlmp_unregister_service(self->skey);
 177                 self->skey = NULL;
 178         }
 179
 180         if (self->iriap) {
 181                 iriap_close(self->iriap);
 182                 self->iriap = NULL;
 183         }
 184
 185         /* Remove LM-IAS object */
 186         if (self->obj) {
 187                 irias_delete_object(self->obj);
 188                 self->obj = NULL;
 189         }
 190
 191         ircomm_tty_do_event(self, IRCOMM_TTY_DETACH_CABLE, NULL, NULL);
 192
 193         /* Reset some values */
 194         self->daddr = self->saddr = 0;
 195         self->dlsap_sel = self->slsap_sel = 0;
 196
 197         memset(&self->settings, 0, sizeof(struct ircomm_params));
 198 }
 199
 200 /*
 201  * Function ircomm_tty_ias_register (self)
 202  *
 203  *    Register with LM-IAS depending on which service type we are
 204  *
 205  */
 206 static void ircomm_tty_ias_register(struct ircomm_tty_cb *self)
 207 {
 208         __u8 oct_seq[6];
 209         __u16 hints;
 210
 211         IRDA_DEBUG(0, "%s()\n", __func__ );
 212
 213         IRDA_ASSERT(self != NULL, return;);
 214         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 215
 216         /* Compute hint bits based on service */
 217         hints = irlmp_service_to_hint(S_COMM);
 218         if (self->service_type & IRCOMM_3_WIRE_RAW)
 219                 hints |= irlmp_service_to_hint(S_PRINTER);
 220
 221         /* Advertise IrCOMM hint bit in discovery */
 222         if (!self->skey)
 223                 self->skey = irlmp_register_service(hints);
 224         /* Set up a discovery handler */
 225         if (!self->ckey)
 226                 self->ckey = irlmp_register_client(hints,
 227                                                    ircomm_tty_discovery_indication,
 228                                                    NULL, (void *) self);
 229
 230         /* If already done, no need to do it again */
 231         if (self->obj)
 232                 return;
 233
 234         if (self->service_type & IRCOMM_3_WIRE_RAW) {
 235                 /* Register IrLPT with LM-IAS */
 236                 self->obj = irias_new_object("IrLPT", IAS_IRLPT_ID);
 237                 irias_add_integer_attrib(self->obj, "IrDA:IrLMP:LsapSel",
 238                                          self->slsap_sel, IAS_KERNEL_ATTR);
 239         } else {
 240                 /* Register IrCOMM with LM-IAS */
 241                 self->obj = irias_new_object("IrDA:IrCOMM", IAS_IRCOMM_ID);
 242                 irias_add_integer_attrib(self->obj, "IrDA:TinyTP:LsapSel",
 243                                          self->slsap_sel, IAS_KERNEL_ATTR);
 244
 245                 /* Code the parameters into the buffer */
 246                 irda_param_pack(oct_seq, "bbbbbb",
 247                                 IRCOMM_SERVICE_TYPE, 1, self->service_type,
 248                                 IRCOMM_PORT_TYPE,    1, IRCOMM_SERIAL);
 249
 250                 /* Register parameters with LM-IAS */
 251                 irias_add_octseq_attrib(self->obj, "Parameters", oct_seq, 6,
 252                                         IAS_KERNEL_ATTR);
 253         }
 254         irias_insert_object(self->obj);
 255 }
 256
 257 /*
 258  * Function ircomm_tty_ias_unregister (self)
 259  *
 260  *    Remove our IAS object and client hook while connected.
 261  *
 262  */
 263 static void ircomm_tty_ias_unregister(struct ircomm_tty_cb *self)
 264 {
 265         /* Remove LM-IAS object now so it is not reused.
 266          * IrCOMM deals very poorly with multiple incoming connections.
 267          * It should looks a lot more like IrNET, and "dup" a server TSAP
 268          * to the application TSAP (based on various rules).
 269          * This is a cheap workaround allowing multiple clients to
 270          * connect to us. It will not always work.
 271          * Each IrCOMM socket has an IAS entry. Incoming connection will
 272          * pick the first one found. So, when we are fully connected,
 273          * we remove our IAS entries so that the next IAS entry is used.
 274          * We do that for *both* client and server, because a server
 275          * can also create client instances.
 276          * Jean II */
 277         if (self->obj) {
 278                 irias_delete_object(self->obj);
 279                 self->obj = NULL;
 280         }
 281
 282 #if 0
 283         /* Remove discovery handler.
 284          * While we are connected, we no longer need to receive
 285          * discovery events. This would be the case if there is
 286          * multiple IrLAP interfaces. Jean II */
 287         if (self->ckey) {
 288                 irlmp_unregister_client(self->ckey);
 289                 self->ckey = NULL;
 290         }
 291 #endif
 292 }
 293
 294 /*
 295  * Function ircomm_send_initial_parameters (self)
 296  *
 297  *    Send initial parameters to the remote IrCOMM device. These parameters
 298  *    must be sent before any data.
 299  */
 300 int ircomm_tty_send_initial_parameters(struct ircomm_tty_cb *self)
 301 {
 302         IRDA_ASSERT(self != NULL, return -1;);
 303         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 304
 305         if (self->service_type & IRCOMM_3_WIRE_RAW)
 306                 return 0;
 307
 308         /*
 309          * Set default values, but only if the application for some reason
 310          * haven't set them already
 311          */
 312         IRDA_DEBUG(2, "%s(), data-rate = %d\n", __func__ ,
 313                    self->settings.data_rate);
 314         if (!self->settings.data_rate)
 315                 self->settings.data_rate = 9600;
 316         IRDA_DEBUG(2, "%s(), data-format = %d\n", __func__ ,
 317                    self->settings.data_format);
 318         if (!self->settings.data_format)
 319                 self->settings.data_format = IRCOMM_WSIZE_8;  /* 8N1 */
 320
 321         IRDA_DEBUG(2, "%s(), flow-control = %d\n", __func__ ,
 322                    self->settings.flow_control);
 323         /*self->settings.flow_control = IRCOMM_RTS_CTS_IN|IRCOMM_RTS_CTS_OUT;*/
 324
 325         /* Do not set delta values for the initial parameters */
 326         self->settings.dte = IRCOMM_DTR | IRCOMM_RTS;
 327
 328         /* Only send service type parameter when we are the client */
 329         if (self->client)
 330                 ircomm_param_request(self, IRCOMM_SERVICE_TYPE, FALSE);
 331         ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
 332         ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
 333
 334         /* For a 3 wire service, we just flush the last parameter and return */
 335         if (self->settings.service_type == IRCOMM_3_WIRE) {
 336                 ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
 337                 return 0;
 338         }
 339
 340         /* Only 9-wire service types continue here */
 341         ircomm_param_request(self, IRCOMM_FLOW_CONTROL, FALSE);
 342 #if 0
 343         ircomm_param_request(self, IRCOMM_XON_XOFF, FALSE);
 344         ircomm_param_request(self, IRCOMM_ENQ_ACK, FALSE);
 345 #endif
 346         /* Notify peer that we are ready to receive data */
 347         ircomm_param_request(self, IRCOMM_DTE, TRUE);
 348
 349         return 0;
 350 }
 351
 352 /*
 353  * Function ircomm_tty_discovery_indication (discovery)
 354  *
 355  *    Remote device is discovered, try query the remote IAS to see which
 356  *    device it is, and which services it has.
 357  *
 358  */
 359 static void ircomm_tty_discovery_indication(discinfo_t *discovery,
 360                                             DISCOVERY_MODE mode,
 361                                             void *priv)
 362 {
 363         struct ircomm_tty_cb *self;
 364         struct ircomm_tty_info info;
 365
 366         IRDA_DEBUG(2, "%s()\n", __func__ );
 367
 368         /* Important note :
 369          * We need to drop all passive discoveries.
 370          * The LSAP management of IrComm is deficient and doesn't deal
 371          * with the case of two instance connecting to each other
 372          * simultaneously (it will deadlock in LMP).
 373          * The proper fix would be to use the same technique as in IrNET,
 374          * to have one server socket and separate instances for the
 375          * connecting/connected socket.
 376          * The workaround is to drop passive discovery, which drastically
 377          * reduce the probability of this happening.
 378          * Jean II */
 379         if(mode == DISCOVERY_PASSIVE)
 380                 return;
 381
 382         info.daddr = discovery->daddr;
 383         info.saddr = discovery->saddr;
 384
 385         self = (struct ircomm_tty_cb *) priv;
 386         ircomm_tty_do_event(self, IRCOMM_TTY_DISCOVERY_INDICATION,
 387                             NULL, &info);
 388 }
 389
 390 /*
 391  * Function ircomm_tty_disconnect_indication (instance, sap, reason, skb)
 392  *
 393  *    Link disconnected
 394  *
 395  */
 396 void ircomm_tty_disconnect_indication(void *instance, void *sap,
 397                                       LM_REASON reason,
 398                                       struct sk_buff *skb)
 399 {
 400         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
 401
 402         IRDA_DEBUG(2, "%s()\n", __func__ );
 403
 404         IRDA_ASSERT(self != NULL, return;);
 405         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 406
 407         if (!self->tty)
 408                 return;
 409
 410         /* This will stop control data transfers */
 411         self->flow = FLOW_STOP;
 412
 413         /* Stop data transfers */
 414         self->tty->hw_stopped = 1;
 415
 416         ircomm_tty_do_event(self, IRCOMM_TTY_DISCONNECT_INDICATION, NULL,
 417                             NULL);
 418 }
 419
 420 /*
 421  * Function ircomm_tty_getvalue_confirm (result, obj_id, value, priv)
 422  *
 423  *    Got result from the IAS query we make
 424  *
 425  */
 426 static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
 427                                         struct ias_value *value,
 428                                         void *priv)
 429 {
 430         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) priv;
 431
 432         IRDA_DEBUG(2, "%s()\n", __func__ );
 433
 434         IRDA_ASSERT(self != NULL, return;);
 435         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 436
 437         /* We probably don't need to make any more queries */
 438         iriap_close(self->iriap);
 439         self->iriap = NULL;
 440
 441         /* Check if request succeeded */
 442         if (result != IAS_SUCCESS) {
 443                 IRDA_DEBUG(4, "%s(), got NULL value!\n", __func__ );
 444                 return;
 445         }
 446
 447         switch (value->type) {
 448         case IAS_OCT_SEQ:
 449                 IRDA_DEBUG(2, "%s(), got octet sequence\n", __func__ );
 450
 451                 irda_param_extract_all(self, value->t.oct_seq, value->len,
 452                                        &ircomm_param_info);
 453
 454                 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_PARAMETERS, NULL,
 455                                     NULL);
 456                 break;
 457         case IAS_INTEGER:
 458                 /* Got LSAP selector */
 459                 IRDA_DEBUG(2, "%s(), got lsapsel = %d\n", __func__ ,
 460                            value->t.integer);
 461
 462                 if (value->t.integer == -1) {
 463                         IRDA_DEBUG(0, "%s(), invalid value!\n", __func__ );
 464                 } else
 465                         self->dlsap_sel = value->t.integer;
 466
 467                 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_LSAPSEL, NULL, NULL);
 468                 break;
 469         case IAS_MISSING:
 470                 IRDA_DEBUG(0, "%s(), got IAS_MISSING\n", __func__ );
 471                 break;
 472         default:
 473                 IRDA_DEBUG(0, "%s(), got unknown type!\n", __func__ );
 474                 break;
 475         }
 476         irias_delete_value(value);
 477 }
 478
 479 /*
 480  * Function ircomm_tty_connect_confirm (instance, sap, qos, max_sdu_size, skb)
 481  *
 482  *    Connection confirmed
 483  *
 484  */
 485 void ircomm_tty_connect_confirm(void *instance, void *sap,
 486                                 struct qos_info *qos,
 487                                 __u32 max_data_size,
 488                                 __u8 max_header_size,
 489                                 struct sk_buff *skb)
 490 {
 491         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
 492
 493         IRDA_DEBUG(2, "%s()\n", __func__ );
 494
 495         IRDA_ASSERT(self != NULL, return;);
 496         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 497
 498         self->client = TRUE;
 499         self->max_data_size = max_data_size;
 500         self->max_header_size = max_header_size;
 501         self->flow = FLOW_START;
 502
 503         ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_CONFIRM, NULL, NULL);
 504
 505         /* No need to kfree_skb - see ircomm_ttp_connect_confirm() */
 506 }
 507
 508 /*
 509  * Function ircomm_tty_connect_indication (instance, sap, qos, max_sdu_size,
 510  *                                         skb)
 511  *
 512  *    we are discovered and being requested to connect by remote device !
 513  *
 514  */
 515 void ircomm_tty_connect_indication(void *instance, void *sap,
 516                                    struct qos_info *qos,
 517                                    __u32 max_data_size,
 518                                    __u8 max_header_size,
 519                                    struct sk_buff *skb)
 520 {
 521         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
 522         int clen;
 523
 524         IRDA_DEBUG(2, "%s()\n", __func__ );
 525
 526         IRDA_ASSERT(self != NULL, return;);
 527         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 528
 529         self->client = FALSE;
 530         self->max_data_size = max_data_size;
 531         self->max_header_size = max_header_size;
 532         self->flow = FLOW_START;
 533
 534         clen = skb->data[0];
 535         if (clen)
 536                 irda_param_extract_all(self, skb->data+1,
 537                                        IRDA_MIN(skb->len, clen),
 538                                        &ircomm_param_info);
 539
 540         ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_INDICATION, NULL, NULL);
 541
 542         /* No need to kfree_skb - see ircomm_ttp_connect_indication() */
 543 }
 544
 545 /*
 546  * Function ircomm_tty_link_established (self)
 547  *
 548  *    Called when the IrCOMM link is established
 549  *
 550  */
 551 void ircomm_tty_link_established(struct ircomm_tty_cb *self)
 552 {
 553         IRDA_DEBUG(2, "%s()\n", __func__ );
 554
 555         IRDA_ASSERT(self != NULL, return;);
 556         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 557
 558         if (!self->tty)
 559                 return;
 560
 561         del_timer(&self->watchdog_timer);
 562
 563         /*
 564          * IrCOMM link is now up, and if we are not using hardware
 565          * flow-control, then declare the hardware as running. Otherwise we
 566          * will have to wait for the peer device (DCE) to raise the CTS
 567          * line.
 568          */
 569         if ((self->flags & ASYNC_CTS_FLOW) && ((self->settings.dce & IRCOMM_CTS) == 0)) {
 570                 IRDA_DEBUG(0, "%s(), waiting for CTS ...\n", __func__ );
 571                 return;
 572         } else {
 573                 IRDA_DEBUG(1, "%s(), starting hardware!\n", __func__ );
 574
 575                 self->tty->hw_stopped = 0;
 576
 577                 /* Wake up processes blocked on open */
 578                 wake_up_interruptible(&self->open_wait);
 579         }
 580
 581         schedule_work(&self->tqueue);
 582 }
 583
 584 /*
 585  * Function ircomm_tty_start_watchdog_timer (self, timeout)
 586  *
 587  *    Start the watchdog timer. This timer is used to make sure that any
 588  *    connection attempt is successful, and if not, we will retry after
 589  *    the timeout
 590  */
 591 static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
 592                                             int timeout)
 593 {
 594         IRDA_ASSERT(self != NULL, return;);
 595         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 596
 597         irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
 598                          ircomm_tty_watchdog_timer_expired);
 599 }
 600
 601 /*
 602  * Function ircomm_tty_watchdog_timer_expired (data)
 603  *
 604  *    Called when the connect procedure have taken to much time.
 605  *
 606  */
 607 static void ircomm_tty_watchdog_timer_expired(void *data)
 608 {
 609         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) data;
 610
 611         IRDA_DEBUG(2, "%s()\n", __func__ );
 612
 613         IRDA_ASSERT(self != NULL, return;);
 614         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 615
 616         ircomm_tty_do_event(self, IRCOMM_TTY_WD_TIMER_EXPIRED, NULL, NULL);
 617 }
 618
 619
 620 /*
 621  * Function ircomm_tty_do_event (self, event, skb)
 622  *
 623  *    Process event
 624  *
 625  */
 626 int ircomm_tty_do_event(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
 627                         struct sk_buff *skb, struct ircomm_tty_info *info)
 628 {
 629         IRDA_ASSERT(self != NULL, return -1;);
 630         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 631
 632         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
 633                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 634
 635         return (*state[self->state])(self, event, skb, info);
 636 }
 637
 638 /*
 639  * Function ircomm_tty_next_state (self, state)
 640  *
 641  *    Switch state
 642  *
 643  */
 644 static inline void ircomm_tty_next_state(struct ircomm_tty_cb *self, IRCOMM_TTY_STATE state)
 645 {
 646         /*
 647         IRDA_ASSERT(self != NULL, return;);
 648         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 649
 650         IRDA_DEBUG(2, "%s: next state=%s, service type=%d\n", __func__ ,
 651                    ircomm_tty_state[self->state], self->service_type);
 652         */
 653         self->state = state;
 654 }
 655
 656 /*
 657  * Function ircomm_tty_state_idle (self, event, skb, info)
 658  *
 659  *    Just hanging around
 660  *
 661  */
 662 static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
 663                                  IRCOMM_TTY_EVENT event,
 664                                  struct sk_buff *skb,
 665                                  struct ircomm_tty_info *info)
 666 {
 667         int ret = 0;
 668
 669         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
 670                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 671         switch (event) {
 672         case IRCOMM_TTY_ATTACH_CABLE:
 673                 /* Try to discover any remote devices */
 674                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 675                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 676
 677                 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
 678                 break;
 679         case IRCOMM_TTY_DISCOVERY_INDICATION:
 680                 self->daddr = info->daddr;
 681                 self->saddr = info->saddr;
 682
 683                 if (self->iriap) {
 684                         IRDA_WARNING("%s(), busy with a previous query\n",
 685                                      __func__);
 686                         return -EBUSY;
 687                 }
 688
 689                 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
 690                                          ircomm_tty_getvalue_confirm);
 691
 692                 iriap_getvaluebyclass_request(self->iriap,
 693                                               self->saddr, self->daddr,
 694                                               "IrDA:IrCOMM", "Parameters");
 695
 696                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 697                 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
 698                 break;
 699         case IRCOMM_TTY_CONNECT_INDICATION:
 700                 del_timer(&self->watchdog_timer);
 701
 702                 /* Accept connection */
 703                 ircomm_connect_response(self->ircomm, NULL);
 704                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 705                 break;
 706         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 707                 /* Just stay idle */
 708                 break;
 709         case IRCOMM_TTY_DETACH_CABLE:
 710                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 711                 break;
 712         default:
 713                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
 714                            ircomm_tty_event[event]);
 715                 ret = -EINVAL;
 716         }
 717         return ret;
 718 }
 719
 720 /*
 721  * Function ircomm_tty_state_search (self, event, skb, info)
 722  *
 723  *    Trying to discover an IrCOMM device
 724  *
 725  */
 726 static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
 727                                    IRCOMM_TTY_EVENT event,
 728                                    struct sk_buff *skb,
 729                                    struct ircomm_tty_info *info)
 730 {
 731         int ret = 0;
 732
 733         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
 734                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 735
 736         switch (event) {
 737         case IRCOMM_TTY_DISCOVERY_INDICATION:
 738                 self->daddr = info->daddr;
 739                 self->saddr = info->saddr;
 740
 741                 if (self->iriap) {
 742                         IRDA_WARNING("%s(), busy with a previous query\n",
 743                                      __func__);
 744                         return -EBUSY;
 745                 }
 746
 747                 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
 748                                          ircomm_tty_getvalue_confirm);
 749
 750                 if (self->service_type == IRCOMM_3_WIRE_RAW) {
 751                         iriap_getvaluebyclass_request(self->iriap, self->saddr,
 752                                                       self->daddr, "IrLPT",
 753                                                       "IrDA:IrLMP:LsapSel");
 754                         ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
 755                 } else {
 756                         iriap_getvaluebyclass_request(self->iriap, self->saddr,
 757                                                       self->daddr,
 758                                                       "IrDA:IrCOMM",
 759                                                       "Parameters");
 760
 761                         ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
 762                 }
 763                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 764                 break;
 765         case IRCOMM_TTY_CONNECT_INDICATION:
 766                 del_timer(&self->watchdog_timer);
 767                 ircomm_tty_ias_unregister(self);
 768
 769                 /* Accept connection */
 770                 ircomm_connect_response(self->ircomm, NULL);
 771                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 772                 break;
 773         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 774 #if 1
 775                 /* Give up */
 776 #else
 777                 /* Try to discover any remote devices */
 778                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 779                 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
 780 #endif
 781                 break;
 782         case IRCOMM_TTY_DETACH_CABLE:
 783                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 784                 break;
 785         default:
 786                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
 787                            ircomm_tty_event[event]);
 788                 ret = -EINVAL;
 789         }
 790         return ret;
 791 }
 792
 793 /*
 794  * Function ircomm_tty_state_query (self, event, skb, info)
 795  *
 796  *    Querying the remote LM-IAS for IrCOMM parameters
 797  *
 798  */
 799 static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
 800                                              IRCOMM_TTY_EVENT event,
 801                                              struct sk_buff *skb,
 802                                              struct ircomm_tty_info *info)
 803 {
 804         int ret = 0;
 805
 806         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
 807                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 808
 809         switch (event) {
 810         case IRCOMM_TTY_GOT_PARAMETERS:
 811                 if (self->iriap) {
 812                         IRDA_WARNING("%s(), busy with a previous query\n",
 813                                      __func__);
 814                         return -EBUSY;
 815                 }
 816
 817                 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
 818                                          ircomm_tty_getvalue_confirm);
 819
 820                 iriap_getvaluebyclass_request(self->iriap, self->saddr,
 821                                               self->daddr, "IrDA:IrCOMM",
 822                                               "IrDA:TinyTP:LsapSel");
 823
 824                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 825                 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
 826                 break;
 827         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 828                 /* Go back to search mode */
 829                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 830                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 831                 break;
 832         case IRCOMM_TTY_CONNECT_INDICATION:
 833                 del_timer(&self->watchdog_timer);
 834                 ircomm_tty_ias_unregister(self);
 835
 836                 /* Accept connection */
 837                 ircomm_connect_response(self->ircomm, NULL);
 838                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 839                 break;
 840         case IRCOMM_TTY_DETACH_CABLE:
 841                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 842                 break;
 843         default:
 844                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
 845                            ircomm_tty_event[event]);
 846                 ret = -EINVAL;
 847         }
 848         return ret;
 849 }
 850
 851 /*
 852  * Function ircomm_tty_state_query_lsap_sel (self, event, skb, info)
 853  *
 854  *    Query remote LM-IAS for the LSAP selector which we can connect to
 855  *
 856  */
 857 static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
 858                                            IRCOMM_TTY_EVENT event,
 859                                            struct sk_buff *skb,
 860                                            struct ircomm_tty_info *info)
 861 {
 862         int ret = 0;
 863
 864         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
 865                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 866
 867         switch (event) {
 868         case IRCOMM_TTY_GOT_LSAPSEL:
 869                 /* Connect to remote device */
 870                 ret = ircomm_connect_request(self->ircomm, self->dlsap_sel,
 871                                              self->saddr, self->daddr,
 872                                              NULL, self->service_type);
 873                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 874                 ircomm_tty_next_state(self, IRCOMM_TTY_SETUP);
 875                 break;
 876         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 877                 /* Go back to search mode */
 878                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 879                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 880                 break;
 881         case IRCOMM_TTY_CONNECT_INDICATION:
 882                 del_timer(&self->watchdog_timer);
 883                 ircomm_tty_ias_unregister(self);
 884
 885                 /* Accept connection */
 886                 ircomm_connect_response(self->ircomm, NULL);
 887                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 888                 break;
 889         case IRCOMM_TTY_DETACH_CABLE:
 890                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 891                 break;
 892         default:
 893                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
 894                            ircomm_tty_event[event]);
 895                 ret = -EINVAL;
 896         }
 897         return ret;
 898 }
 899
 900 /*
 901  * Function ircomm_tty_state_setup (self, event, skb, info)
 902  *
 903  *    Trying to connect
 904  *
 905  */
 906 static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
 907                                   IRCOMM_TTY_EVENT event,
 908                                   struct sk_buff *skb,
 909                                   struct ircomm_tty_info *info)
 910 {
 911         int ret = 0;
 912
 913         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
 914                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 915
 916         switch (event) {
 917         case IRCOMM_TTY_CONNECT_CONFIRM:
 918                 del_timer(&self->watchdog_timer);
 919                 ircomm_tty_ias_unregister(self);
 920
 921                 /*
 922                  * Send initial parameters. This will also send out queued
 923                  * parameters waiting for the connection to come up
 924                  */
 925                 ircomm_tty_send_initial_parameters(self);
 926                 ircomm_tty_link_established(self);
 927                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 928                 break;
 929         case IRCOMM_TTY_CONNECT_INDICATION:
 930                 del_timer(&self->watchdog_timer);
 931                 ircomm_tty_ias_unregister(self);
 932
 933                 /* Accept connection */
 934                 ircomm_connect_response(self->ircomm, NULL);
 935                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 936                 break;
 937         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 938                 /* Go back to search mode */
 939                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 940                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 941                 break;
 942         case IRCOMM_TTY_DETACH_CABLE:
 943                 /* ircomm_disconnect_request(self->ircomm, NULL); */
 944                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 945                 break;
 946         default:
 947                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
 948                            ircomm_tty_event[event]);
 949                 ret = -EINVAL;
 950         }
 951         return ret;
 952 }
 953
 954 /*
 955  * Function ircomm_tty_state_ready (self, event, skb, info)
 956  *
 957  *    IrCOMM is now connected
 958  *
 959  */
 960 static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
 961                                   IRCOMM_TTY_EVENT event,
 962                                   struct sk_buff *skb,
 963                                   struct ircomm_tty_info *info)
 964 {
 965         int ret = 0;
 966
 967         switch (event) {
 968         case IRCOMM_TTY_DATA_REQUEST:
 969                 ret = ircomm_data_request(self->ircomm, skb);
 970                 break;
 971         case IRCOMM_TTY_DETACH_CABLE:
 972                 ircomm_disconnect_request(self->ircomm, NULL);
 973                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 974                 break;
 975         case IRCOMM_TTY_DISCONNECT_INDICATION:
 976                 ircomm_tty_ias_register(self);
 977                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 978                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 979
 980                 if (self->flags & ASYNC_CHECK_CD) {
 981                         /* Drop carrier */
 982                         self->settings.dce = IRCOMM_DELTA_CD;
 983                         ircomm_tty_check_modem_status(self);
 984                 } else {
 985                         IRDA_DEBUG(0, "%s(), hanging up!\n", __func__ );
 986                         if (self->tty)
 987                                 tty_hangup(self->tty);
 988                 }
 989                 break;
 990         default:
 991                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
 992                            ircomm_tty_event[event]);
 993                 ret = -EINVAL;
 994         }
 995         return ret;
 996 }
 997