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/sched.h>
  33 #include <linux/init.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 char *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 char *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", __FUNCTION__ );
 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", __FUNCTION__ );
 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", __FUNCTION__ );
 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", __FUNCTION__ );
 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", __FUNCTION__ ,
 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", __FUNCTION__ ,
 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", __FUNCTION__ ,
 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", __FUNCTION__ );
 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         /* FIXME. We have a locking problem on the hashbin here.
 386          * We probably need to use hashbin_find_next(), but we first
 387          * need to ensure that "line" is unique. - Jean II */
 388         self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
 389         while (self != NULL) {
 390                 IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 391
 392                 ircomm_tty_do_event(self, IRCOMM_TTY_DISCOVERY_INDICATION,
 393                                     NULL, &info);
 394
 395                 self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
 396         }
 397 }
 398
 399 /*
 400  * Function ircomm_tty_disconnect_indication (instance, sap, reason, skb)
 401  *
 402  *    Link disconnected
 403  *
 404  */
 405 void ircomm_tty_disconnect_indication(void *instance, void *sap,
 406                                       LM_REASON reason,
 407                                       struct sk_buff *skb)
 408 {
 409         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
 410
 411         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 412
 413         IRDA_ASSERT(self != NULL, return;);
 414         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 415
 416         if (!self->tty)
 417                 return;
 418
 419         /* This will stop control data transfers */
 420         self->flow = FLOW_STOP;
 421
 422         /* Stop data transfers */
 423         self->tty->hw_stopped = 1;
 424
 425         ircomm_tty_do_event(self, IRCOMM_TTY_DISCONNECT_INDICATION, NULL,
 426                             NULL);
 427 }
 428
 429 /*
 430  * Function ircomm_tty_getvalue_confirm (result, obj_id, value, priv)
 431  *
 432  *    Got result from the IAS query we make
 433  *
 434  */
 435 static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
 436                                         struct ias_value *value,
 437                                         void *priv)
 438 {
 439         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) priv;
 440
 441         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 442
 443         IRDA_ASSERT(self != NULL, return;);
 444         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 445
 446         /* We probably don't need to make any more queries */
 447         iriap_close(self->iriap);
 448         self->iriap = NULL;
 449
 450         /* Check if request succeeded */
 451         if (result != IAS_SUCCESS) {
 452                 IRDA_DEBUG(4, "%s(), got NULL value!\n", __FUNCTION__ );
 453                 return;
 454         }
 455
 456         switch (value->type) {
 457         case IAS_OCT_SEQ:
 458                 IRDA_DEBUG(2, "%s(), got octet sequence\n", __FUNCTION__ );
 459
 460                 irda_param_extract_all(self, value->t.oct_seq, value->len,
 461                                        &ircomm_param_info);
 462
 463                 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_PARAMETERS, NULL,
 464                                     NULL);
 465                 break;
 466         case IAS_INTEGER:
 467                 /* Got LSAP selector */
 468                 IRDA_DEBUG(2, "%s(), got lsapsel = %d\n", __FUNCTION__ ,
 469                            value->t.integer);
 470
 471                 if (value->t.integer == -1) {
 472                         IRDA_DEBUG(0, "%s(), invalid value!\n", __FUNCTION__ );
 473                 } else
 474                         self->dlsap_sel = value->t.integer;
 475
 476                 ircomm_tty_do_event(self, IRCOMM_TTY_GOT_LSAPSEL, NULL, NULL);
 477                 break;
 478         case IAS_MISSING:
 479                 IRDA_DEBUG(0, "%s(), got IAS_MISSING\n", __FUNCTION__ );
 480                 break;
 481         default:
 482                 IRDA_DEBUG(0, "%s(), got unknown type!\n", __FUNCTION__ );
 483                 break;
 484         }
 485         irias_delete_value(value);
 486 }
 487
 488 /*
 489  * Function ircomm_tty_connect_confirm (instance, sap, qos, max_sdu_size, skb)
 490  *
 491  *    Connection confirmed
 492  *
 493  */
 494 void ircomm_tty_connect_confirm(void *instance, void *sap,
 495                                 struct qos_info *qos,
 496                                 __u32 max_data_size,
 497                                 __u8 max_header_size,
 498                                 struct sk_buff *skb)
 499 {
 500         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
 501
 502         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 503
 504         IRDA_ASSERT(self != NULL, return;);
 505         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 506
 507         self->client = TRUE;
 508         self->max_data_size = max_data_size;
 509         self->max_header_size = max_header_size;
 510         self->flow = FLOW_START;
 511
 512         ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_CONFIRM, NULL, NULL);
 513
 514         /* No need to kfree_skb - see ircomm_ttp_connect_confirm() */
 515 }
 516
 517 /*
 518  * Function ircomm_tty_connect_indication (instance, sap, qos, max_sdu_size,
 519  *                                         skb)
 520  *
 521  *    we are discovered and being requested to connect by remote device !
 522  *
 523  */
 524 void ircomm_tty_connect_indication(void *instance, void *sap,
 525                                    struct qos_info *qos,
 526                                    __u32 max_data_size,
 527                                    __u8 max_header_size,
 528                                    struct sk_buff *skb)
 529 {
 530         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
 531         int clen;
 532
 533         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 534
 535         IRDA_ASSERT(self != NULL, return;);
 536         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 537
 538         self->client = FALSE;
 539         self->max_data_size = max_data_size;
 540         self->max_header_size = max_header_size;
 541         self->flow = FLOW_START;
 542
 543         clen = skb->data[0];
 544         if (clen)
 545                 irda_param_extract_all(self, skb->data+1,
 546                                        IRDA_MIN(skb->len, clen),
 547                                        &ircomm_param_info);
 548
 549         ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_INDICATION, NULL, NULL);
 550
 551         /* No need to kfree_skb - see ircomm_ttp_connect_indication() */
 552 }
 553
 554 /*
 555  * Function ircomm_tty_link_established (self)
 556  *
 557  *    Called when the IrCOMM link is established
 558  *
 559  */
 560 void ircomm_tty_link_established(struct ircomm_tty_cb *self)
 561 {
 562         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 563
 564         IRDA_ASSERT(self != NULL, return;);
 565         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 566
 567         if (!self->tty)
 568                 return;
 569
 570         del_timer(&self->watchdog_timer);
 571
 572         /*
 573          * IrCOMM link is now up, and if we are not using hardware
 574          * flow-control, then declare the hardware as running. Otherwise we
 575          * will have to wait for the peer device (DCE) to raise the CTS
 576          * line.
 577          */
 578         if ((self->flags & ASYNC_CTS_FLOW) && ((self->settings.dce & IRCOMM_CTS) == 0)) {
 579                 IRDA_DEBUG(0, "%s(), waiting for CTS ...\n", __FUNCTION__ );
 580                 return;
 581         } else {
 582                 IRDA_DEBUG(1, "%s(), starting hardware!\n", __FUNCTION__ );
 583
 584                 self->tty->hw_stopped = 0;
 585
 586                 /* Wake up processes blocked on open */
 587                 wake_up_interruptible(&self->open_wait);
 588         }
 589
 590         schedule_work(&self->tqueue);
 591 }
 592
 593 /*
 594  * Function ircomm_tty_start_watchdog_timer (self, timeout)
 595  *
 596  *    Start the watchdog timer. This timer is used to make sure that any
 597  *    connection attempt is successful, and if not, we will retry after
 598  *    the timeout
 599  */
 600 static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
 601                                             int timeout)
 602 {
 603         IRDA_ASSERT(self != NULL, return;);
 604         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 605
 606         irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
 607                          ircomm_tty_watchdog_timer_expired);
 608 }
 609
 610 /*
 611  * Function ircomm_tty_watchdog_timer_expired (data)
 612  *
 613  *    Called when the connect procedure have taken to much time.
 614  *
 615  */
 616 static void ircomm_tty_watchdog_timer_expired(void *data)
 617 {
 618         struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) data;
 619
 620         IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
 621
 622         IRDA_ASSERT(self != NULL, return;);
 623         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 624
 625         ircomm_tty_do_event(self, IRCOMM_TTY_WD_TIMER_EXPIRED, NULL, NULL);
 626 }
 627
 628
 629 /*
 630  * Function ircomm_tty_do_event (self, event, skb)
 631  *
 632  *    Process event
 633  *
 634  */
 635 int ircomm_tty_do_event(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
 636                         struct sk_buff *skb, struct ircomm_tty_info *info)
 637 {
 638         IRDA_ASSERT(self != NULL, return -1;);
 639         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
 640
 641         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
 642                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 643
 644         return (*state[self->state])(self, event, skb, info);
 645 }
 646
 647 /*
 648  * Function ircomm_tty_next_state (self, state)
 649  *
 650  *    Switch state
 651  *
 652  */
 653 static inline void ircomm_tty_next_state(struct ircomm_tty_cb *self, IRCOMM_TTY_STATE state)
 654 {
 655         /*
 656         IRDA_ASSERT(self != NULL, return;);
 657         IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
 658
 659         IRDA_DEBUG(2, "%s: next state=%s, service type=%d\n", __FUNCTION__ ,
 660                    ircomm_tty_state[self->state], self->service_type);
 661         */
 662         self->state = state;
 663 }
 664
 665 /*
 666  * Function ircomm_tty_state_idle (self, event, skb, info)
 667  *
 668  *    Just hanging around
 669  *
 670  */
 671 static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
 672                                  IRCOMM_TTY_EVENT event,
 673                                  struct sk_buff *skb,
 674                                  struct ircomm_tty_info *info)
 675 {
 676         int ret = 0;
 677
 678         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
 679                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 680         switch (event) {
 681         case IRCOMM_TTY_ATTACH_CABLE:
 682                 /* Try to discover any remote devices */
 683                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 684                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 685
 686                 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
 687                 break;
 688         case IRCOMM_TTY_DISCOVERY_INDICATION:
 689                 self->daddr = info->daddr;
 690                 self->saddr = info->saddr;
 691
 692                 if (self->iriap) {
 693                         IRDA_WARNING("%s(), busy with a previous query\n",
 694                                      __FUNCTION__);
 695                         return -EBUSY;
 696                 }
 697
 698                 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
 699                                          ircomm_tty_getvalue_confirm);
 700
 701                 iriap_getvaluebyclass_request(self->iriap,
 702                                               self->saddr, self->daddr,
 703                                               "IrDA:IrCOMM", "Parameters");
 704
 705                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 706                 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
 707                 break;
 708         case IRCOMM_TTY_CONNECT_INDICATION:
 709                 del_timer(&self->watchdog_timer);
 710
 711                 /* Accept connection */
 712                 ircomm_connect_response(self->ircomm, NULL);
 713                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 714                 break;
 715         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 716                 /* Just stay idle */
 717                 break;
 718         case IRCOMM_TTY_DETACH_CABLE:
 719                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 720                 break;
 721         default:
 722                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
 723                            ircomm_tty_event[event]);
 724                 ret = -EINVAL;
 725         }
 726         return ret;
 727 }
 728
 729 /*
 730  * Function ircomm_tty_state_search (self, event, skb, info)
 731  *
 732  *    Trying to discover an IrCOMM device
 733  *
 734  */
 735 static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
 736                                    IRCOMM_TTY_EVENT event,
 737                                    struct sk_buff *skb,
 738                                    struct ircomm_tty_info *info)
 739 {
 740         int ret = 0;
 741
 742         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
 743                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 744
 745         switch (event) {
 746         case IRCOMM_TTY_DISCOVERY_INDICATION:
 747                 self->daddr = info->daddr;
 748                 self->saddr = info->saddr;
 749
 750                 if (self->iriap) {
 751                         IRDA_WARNING("%s(), busy with a previous query\n",
 752                                      __FUNCTION__);
 753                         return -EBUSY;
 754                 }
 755
 756                 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
 757                                          ircomm_tty_getvalue_confirm);
 758
 759                 if (self->service_type == IRCOMM_3_WIRE_RAW) {
 760                         iriap_getvaluebyclass_request(self->iriap, self->saddr,
 761                                                       self->daddr, "IrLPT",
 762                                                       "IrDA:IrLMP:LsapSel");
 763                         ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
 764                 } else {
 765                         iriap_getvaluebyclass_request(self->iriap, self->saddr,
 766                                                       self->daddr,
 767                                                       "IrDA:IrCOMM",
 768                                                       "Parameters");
 769
 770                         ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
 771                 }
 772                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 773                 break;
 774         case IRCOMM_TTY_CONNECT_INDICATION:
 775                 del_timer(&self->watchdog_timer);
 776                 ircomm_tty_ias_unregister(self);
 777
 778                 /* Accept connection */
 779                 ircomm_connect_response(self->ircomm, NULL);
 780                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 781                 break;
 782         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 783 #if 1
 784                 /* Give up */
 785 #else
 786                 /* Try to discover any remote devices */
 787                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 788                 irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
 789 #endif
 790                 break;
 791         case IRCOMM_TTY_DETACH_CABLE:
 792                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 793                 break;
 794         default:
 795                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
 796                            ircomm_tty_event[event]);
 797                 ret = -EINVAL;
 798         }
 799         return ret;
 800 }
 801
 802 /*
 803  * Function ircomm_tty_state_query (self, event, skb, info)
 804  *
 805  *    Querying the remote LM-IAS for IrCOMM parameters
 806  *
 807  */
 808 static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
 809                                              IRCOMM_TTY_EVENT event,
 810                                              struct sk_buff *skb,
 811                                              struct ircomm_tty_info *info)
 812 {
 813         int ret = 0;
 814
 815         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
 816                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 817
 818         switch (event) {
 819         case IRCOMM_TTY_GOT_PARAMETERS:
 820                 if (self->iriap) {
 821                         IRDA_WARNING("%s(), busy with a previous query\n",
 822                                      __FUNCTION__);
 823                         return -EBUSY;
 824                 }
 825
 826                 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
 827                                          ircomm_tty_getvalue_confirm);
 828
 829                 iriap_getvaluebyclass_request(self->iriap, self->saddr,
 830                                               self->daddr, "IrDA:IrCOMM",
 831                                               "IrDA:TinyTP:LsapSel");
 832
 833                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 834                 ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
 835                 break;
 836         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 837                 /* Go back to search mode */
 838                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 839                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 840                 break;
 841         case IRCOMM_TTY_CONNECT_INDICATION:
 842                 del_timer(&self->watchdog_timer);
 843                 ircomm_tty_ias_unregister(self);
 844
 845                 /* Accept connection */
 846                 ircomm_connect_response(self->ircomm, NULL);
 847                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 848                 break;
 849         case IRCOMM_TTY_DETACH_CABLE:
 850                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 851                 break;
 852         default:
 853                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
 854                            ircomm_tty_event[event]);
 855                 ret = -EINVAL;
 856         }
 857         return ret;
 858 }
 859
 860 /*
 861  * Function ircomm_tty_state_query_lsap_sel (self, event, skb, info)
 862  *
 863  *    Query remote LM-IAS for the LSAP selector which we can connect to
 864  *
 865  */
 866 static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
 867                                            IRCOMM_TTY_EVENT event,
 868                                            struct sk_buff *skb,
 869                                            struct ircomm_tty_info *info)
 870 {
 871         int ret = 0;
 872
 873         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
 874                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 875
 876         switch (event) {
 877         case IRCOMM_TTY_GOT_LSAPSEL:
 878                 /* Connect to remote device */
 879                 ret = ircomm_connect_request(self->ircomm, self->dlsap_sel,
 880                                              self->saddr, self->daddr,
 881                                              NULL, self->service_type);
 882                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 883                 ircomm_tty_next_state(self, IRCOMM_TTY_SETUP);
 884                 break;
 885         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 886                 /* Go back to search mode */
 887                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 888                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 889                 break;
 890         case IRCOMM_TTY_CONNECT_INDICATION:
 891                 del_timer(&self->watchdog_timer);
 892                 ircomm_tty_ias_unregister(self);
 893
 894                 /* Accept connection */
 895                 ircomm_connect_response(self->ircomm, NULL);
 896                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 897                 break;
 898         case IRCOMM_TTY_DETACH_CABLE:
 899                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 900                 break;
 901         default:
 902                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
 903                            ircomm_tty_event[event]);
 904                 ret = -EINVAL;
 905         }
 906         return ret;
 907 }
 908
 909 /*
 910  * Function ircomm_tty_state_setup (self, event, skb, info)
 911  *
 912  *    Trying to connect
 913  *
 914  */
 915 static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
 916                                   IRCOMM_TTY_EVENT event,
 917                                   struct sk_buff *skb,
 918                                   struct ircomm_tty_info *info)
 919 {
 920         int ret = 0;
 921
 922         IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __FUNCTION__ ,
 923                    ircomm_tty_state[self->state], ircomm_tty_event[event]);
 924
 925         switch (event) {
 926         case IRCOMM_TTY_CONNECT_CONFIRM:
 927                 del_timer(&self->watchdog_timer);
 928                 ircomm_tty_ias_unregister(self);
 929
 930                 /*
 931                  * Send initial parameters. This will also send out queued
 932                  * parameters waiting for the connection to come up
 933                  */
 934                 ircomm_tty_send_initial_parameters(self);
 935                 ircomm_tty_link_established(self);
 936                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 937                 break;
 938         case IRCOMM_TTY_CONNECT_INDICATION:
 939                 del_timer(&self->watchdog_timer);
 940                 ircomm_tty_ias_unregister(self);
 941
 942                 /* Accept connection */
 943                 ircomm_connect_response(self->ircomm, NULL);
 944                 ircomm_tty_next_state(self, IRCOMM_TTY_READY);
 945                 break;
 946         case IRCOMM_TTY_WD_TIMER_EXPIRED:
 947                 /* Go back to search mode */
 948                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 949                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 950                 break;
 951         case IRCOMM_TTY_DETACH_CABLE:
 952                 /* ircomm_disconnect_request(self->ircomm, NULL); */
 953                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 954                 break;
 955         default:
 956                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
 957                            ircomm_tty_event[event]);
 958                 ret = -EINVAL;
 959         }
 960         return ret;
 961 }
 962
 963 /*
 964  * Function ircomm_tty_state_ready (self, event, skb, info)
 965  *
 966  *    IrCOMM is now connected
 967  *
 968  */
 969 static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
 970                                   IRCOMM_TTY_EVENT event,
 971                                   struct sk_buff *skb,
 972                                   struct ircomm_tty_info *info)
 973 {
 974         int ret = 0;
 975
 976         switch (event) {
 977         case IRCOMM_TTY_DATA_REQUEST:
 978                 ret = ircomm_data_request(self->ircomm, skb);
 979                 break;
 980         case IRCOMM_TTY_DETACH_CABLE:
 981                 ircomm_disconnect_request(self->ircomm, NULL);
 982                 ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
 983                 break;
 984         case IRCOMM_TTY_DISCONNECT_INDICATION:
 985                 ircomm_tty_ias_register(self);
 986                 ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
 987                 ircomm_tty_start_watchdog_timer(self, 3*HZ);
 988
 989                 if (self->flags & ASYNC_CHECK_CD) {
 990                         /* Drop carrier */
 991                         self->settings.dce = IRCOMM_DELTA_CD;
 992                         ircomm_tty_check_modem_status(self);
 993                 } else {
 994                         IRDA_DEBUG(0, "%s(), hanging up!\n", __FUNCTION__ );
 995                         if (self->tty)
 996                                 tty_hangup(self->tty);
 997                 }
 998                 break;
 999         default:
1000                 IRDA_DEBUG(2, "%s(), unknown event: %s\n", __FUNCTION__ ,
1001                            ircomm_tty_event[event]);
1002                 ret = -EINVAL;
1003         }
1004         return ret;
1005 }
1006