kernel/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, 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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