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   1 /*********************************************************************
   2  *
   3  * Filename:      iriap_event.c
   4  * Version:       0.1
   5  * Description:   IAP Finite State Machine
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Thu Aug 21 00:02:07 1997
   9  * Modified at:   Wed Mar  1 11:28:34 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1997, 1999-2000 Dag Brattli <dagb@cs.uit.no>,
  13  *     All Rights Reserved.
  14  *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  22  *     provide warranty for any of this software. This material is
  23  *     provided "AS-IS" and at no charge.
  24  *
  25  ********************************************************************/
  26
  27 #include <net/irda/irda.h>
  28 #include <net/irda/irlmp.h>
  29 #include <net/irda/iriap.h>
  30 #include <net/irda/iriap_event.h>
  31
  32 static void state_s_disconnect   (struct iriap_cb *self, IRIAP_EVENT event,
  33                                   struct sk_buff *skb);
  34 static void state_s_connecting   (struct iriap_cb *self, IRIAP_EVENT event,
  35                                   struct sk_buff *skb);
  36 static void state_s_call         (struct iriap_cb *self, IRIAP_EVENT event,
  37                                   struct sk_buff *skb);
  38
  39 static void state_s_make_call    (struct iriap_cb *self, IRIAP_EVENT event,
  40                                   struct sk_buff *skb);
  41 static void state_s_calling      (struct iriap_cb *self, IRIAP_EVENT event,
  42                                   struct sk_buff *skb);
  43 static void state_s_outstanding  (struct iriap_cb *self, IRIAP_EVENT event,
  44                                   struct sk_buff *skb);
  45 static void state_s_replying     (struct iriap_cb *self, IRIAP_EVENT event,
  46                                   struct sk_buff *skb);
  47 static void state_s_wait_for_call(struct iriap_cb *self, IRIAP_EVENT event,
  48                                   struct sk_buff *skb);
  49 static void state_s_wait_active  (struct iriap_cb *self, IRIAP_EVENT event,
  50                                   struct sk_buff *skb);
  51
  52 static void state_r_disconnect   (struct iriap_cb *self, IRIAP_EVENT event,
  53                                   struct sk_buff *skb);
  54 static void state_r_call         (struct iriap_cb *self, IRIAP_EVENT event,
  55                                   struct sk_buff *skb);
  56 static void state_r_waiting      (struct iriap_cb *self, IRIAP_EVENT event,
  57                                   struct sk_buff *skb);
  58 static void state_r_wait_active  (struct iriap_cb *self, IRIAP_EVENT event,
  59                                   struct sk_buff *skb);
  60 static void state_r_receiving    (struct iriap_cb *self, IRIAP_EVENT event,
  61                                   struct sk_buff *skb);
  62 static void state_r_execute      (struct iriap_cb *self, IRIAP_EVENT event,
  63                                   struct sk_buff *skb);
  64 static void state_r_returning    (struct iriap_cb *self, IRIAP_EVENT event,
  65                                   struct sk_buff *skb);
  66
  67 static void (*iriap_state[])(struct iriap_cb *self, IRIAP_EVENT event,
  68                              struct sk_buff *skb) = {
  69         /* Client FSM */
  70         state_s_disconnect,
  71         state_s_connecting,
  72         state_s_call,
  73
  74         /* S-Call FSM */
  75         state_s_make_call,
  76         state_s_calling,
  77         state_s_outstanding,
  78         state_s_replying,
  79         state_s_wait_for_call,
  80         state_s_wait_active,
  81
  82         /* Server FSM */
  83         state_r_disconnect,
  84         state_r_call,
  85
  86         /* R-Connect FSM */
  87         state_r_waiting,
  88         state_r_wait_active,
  89         state_r_receiving,
  90         state_r_execute,
  91         state_r_returning,
  92 };
  93
  94 void iriap_next_client_state(struct iriap_cb *self, IRIAP_STATE state)
  95 {
  96         IRDA_ASSERT(self != NULL, return;);
  97         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
  98
  99         self->client_state = state;
 100 }
 101
 102 void iriap_next_call_state(struct iriap_cb *self, IRIAP_STATE state)
 103 {
 104         IRDA_ASSERT(self != NULL, return;);
 105         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 106
 107         self->call_state = state;
 108 }
 109
 110 void iriap_next_server_state(struct iriap_cb *self, IRIAP_STATE state)
 111 {
 112         IRDA_ASSERT(self != NULL, return;);
 113         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 114
 115         self->server_state = state;
 116 }
 117
 118 void iriap_next_r_connect_state(struct iriap_cb *self, IRIAP_STATE state)
 119 {
 120         IRDA_ASSERT(self != NULL, return;);
 121         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 122
 123         self->r_connect_state = state;
 124 }
 125
 126 void iriap_do_client_event(struct iriap_cb *self, IRIAP_EVENT event,
 127                            struct sk_buff *skb)
 128 {
 129         IRDA_ASSERT(self != NULL, return;);
 130         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 131
 132         (*iriap_state[ self->client_state]) (self, event, skb);
 133 }
 134
 135 void iriap_do_call_event(struct iriap_cb *self, IRIAP_EVENT event,
 136                          struct sk_buff *skb)
 137 {
 138         IRDA_ASSERT(self != NULL, return;);
 139         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 140
 141         (*iriap_state[ self->call_state]) (self, event, skb);
 142 }
 143
 144 void iriap_do_server_event(struct iriap_cb *self, IRIAP_EVENT event,
 145                            struct sk_buff *skb)
 146 {
 147         IRDA_ASSERT(self != NULL, return;);
 148         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 149
 150         (*iriap_state[ self->server_state]) (self, event, skb);
 151 }
 152
 153 void iriap_do_r_connect_event(struct iriap_cb *self, IRIAP_EVENT event,
 154                               struct sk_buff *skb)
 155 {
 156         IRDA_ASSERT(self != NULL, return;);
 157         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 158
 159         (*iriap_state[ self->r_connect_state]) (self, event, skb);
 160 }
 161
 162
 163 /*
 164  * Function state_s_disconnect (event, skb)
 165  *
 166  *    S-Disconnect, The device has no LSAP connection to a particular
 167  *    remote device.
 168  */
 169 static void state_s_disconnect(struct iriap_cb *self, IRIAP_EVENT event,
 170                                struct sk_buff *skb)
 171 {
 172         IRDA_ASSERT(self != NULL, return;);
 173         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 174
 175         switch (event) {
 176         case IAP_CALL_REQUEST_GVBC:
 177                 iriap_next_client_state(self, S_CONNECTING);
 178                 IRDA_ASSERT(self->request_skb == NULL, return;);
 179                 /* Don't forget to refcount it -
 180                  * see iriap_getvaluebyclass_request(). */
 181                 skb_get(skb);
 182                 self->request_skb = skb;
 183                 iriap_connect_request(self);
 184                 break;
 185         case IAP_LM_DISCONNECT_INDICATION:
 186                 break;
 187         default:
 188                 IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
 189                 break;
 190         }
 191 }
 192
 193 /*
 194  * Function state_s_connecting (self, event, skb)
 195  *
 196  *    S-Connecting
 197  *
 198  */
 199 static void state_s_connecting(struct iriap_cb *self, IRIAP_EVENT event,
 200                                struct sk_buff *skb)
 201 {
 202         IRDA_ASSERT(self != NULL, return;);
 203         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 204
 205         switch (event) {
 206         case IAP_LM_CONNECT_CONFIRM:
 207                 /*
 208                  *  Jump to S-Call FSM
 209                  */
 210                 iriap_do_call_event(self, IAP_CALL_REQUEST, skb);
 211                 /* iriap_call_request(self, 0,0,0); */
 212                 iriap_next_client_state(self, S_CALL);
 213                 break;
 214         case IAP_LM_DISCONNECT_INDICATION:
 215                 /* Abort calls */
 216                 iriap_next_call_state(self, S_MAKE_CALL);
 217                 iriap_next_client_state(self, S_DISCONNECT);
 218                 break;
 219         default:
 220                 IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
 221                 break;
 222         }
 223 }
 224
 225 /*
 226  * Function state_s_call (self, event, skb)
 227  *
 228  *    S-Call, The device can process calls to a specific remote
 229  *    device. Whenever the LSAP connection is disconnected, this state
 230  *    catches that event and clears up
 231  */
 232 static void state_s_call(struct iriap_cb *self, IRIAP_EVENT event,
 233                          struct sk_buff *skb)
 234 {
 235         IRDA_ASSERT(self != NULL, return;);
 236
 237         switch (event) {
 238         case IAP_LM_DISCONNECT_INDICATION:
 239                 /* Abort calls */
 240                 iriap_next_call_state(self, S_MAKE_CALL);
 241                 iriap_next_client_state(self, S_DISCONNECT);
 242                 break;
 243         default:
 244                 IRDA_DEBUG(0, "state_s_call: Unknown event %d\n", event);
 245                 break;
 246         }
 247 }
 248
 249 /*
 250  * Function state_s_make_call (event, skb)
 251  *
 252  *    S-Make-Call
 253  *
 254  */
 255 static void state_s_make_call(struct iriap_cb *self, IRIAP_EVENT event,
 256                               struct sk_buff *skb)
 257 {
 258         struct sk_buff *tx_skb;
 259
 260         IRDA_ASSERT(self != NULL, return;);
 261
 262         switch (event) {
 263         case IAP_CALL_REQUEST:
 264                 /* Already refcounted - see state_s_disconnect() */
 265                 tx_skb = self->request_skb;
 266                 self->request_skb = NULL;
 267
 268                 irlmp_data_request(self->lsap, tx_skb);
 269                 iriap_next_call_state(self, S_OUTSTANDING);
 270                 break;
 271         default:
 272                 IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
 273                 break;
 274         }
 275 }
 276
 277 /*
 278  * Function state_s_calling (event, skb)
 279  *
 280  *    S-Calling
 281  *
 282  */
 283 static void state_s_calling(struct iriap_cb *self, IRIAP_EVENT event,
 284                             struct sk_buff *skb)
 285 {
 286         IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
 287 }
 288
 289 /*
 290  * Function state_s_outstanding (event, skb)
 291  *
 292  *    S-Outstanding, The device is waiting for a response to a command
 293  *
 294  */
 295 static void state_s_outstanding(struct iriap_cb *self, IRIAP_EVENT event,
 296                                 struct sk_buff *skb)
 297 {
 298         IRDA_ASSERT(self != NULL, return;);
 299
 300         switch (event) {
 301         case IAP_RECV_F_LST:
 302                 /*iriap_send_ack(self);*/
 303                 /*LM_Idle_request(idle); */
 304
 305                 iriap_next_call_state(self, S_WAIT_FOR_CALL);
 306                 break;
 307         default:
 308                 IRDA_DEBUG(0, "%s(), Unknown event %d\n", __func__, event);
 309                 break;
 310         }
 311 }
 312
 313 /*
 314  * Function state_s_replying (event, skb)
 315  *
 316  *    S-Replying, The device is collecting a multiple part response
 317  */
 318 static void state_s_replying(struct iriap_cb *self, IRIAP_EVENT event,
 319                              struct sk_buff *skb)
 320 {
 321         IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
 322 }
 323
 324 /*
 325  * Function state_s_wait_for_call (event, skb)
 326  *
 327  *    S-Wait-for-Call
 328  *
 329  */
 330 static void state_s_wait_for_call(struct iriap_cb *self, IRIAP_EVENT event,
 331                                   struct sk_buff *skb)
 332 {
 333         IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
 334 }
 335
 336
 337 /*
 338  * Function state_s_wait_active (event, skb)
 339  *
 340  *    S-Wait-Active
 341  *
 342  */
 343 static void state_s_wait_active(struct iriap_cb *self, IRIAP_EVENT event,
 344                                 struct sk_buff *skb)
 345 {
 346         IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
 347 }
 348
 349 /**************************************************************************
 350  *
 351  *  Server FSM
 352  *
 353  **************************************************************************/
 354
 355 /*
 356  * Function state_r_disconnect (self, event, skb)
 357  *
 358  *    LM-IAS server is disconnected (not processing any requests!)
 359  *
 360  */
 361 static void state_r_disconnect(struct iriap_cb *self, IRIAP_EVENT event,
 362                                struct sk_buff *skb)
 363 {
 364         struct sk_buff *tx_skb;
 365
 366         switch (event) {
 367         case IAP_LM_CONNECT_INDICATION:
 368                 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
 369                 if (tx_skb == NULL) {
 370                         IRDA_WARNING("%s: unable to malloc!\n", __func__);
 371                         return;
 372                 }
 373
 374                 /* Reserve space for MUX_CONTROL and LAP header */
 375                 skb_reserve(tx_skb, LMP_MAX_HEADER);
 376
 377                 irlmp_connect_response(self->lsap, tx_skb);
 378                 /*LM_Idle_request(idle); */
 379
 380                 iriap_next_server_state(self, R_CALL);
 381
 382                 /*
 383                  *  Jump to R-Connect FSM, we skip R-Waiting since we do not
 384                  *  care about LM_Idle_request()!
 385                  */
 386                 iriap_next_r_connect_state(self, R_RECEIVING);
 387                 break;
 388         default:
 389                 IRDA_DEBUG(0, "%s(), unknown event %d\n", __func__, event);
 390                 break;
 391         }
 392 }
 393
 394 /*
 395  * Function state_r_call (self, event, skb)
 396  */
 397 static void state_r_call(struct iriap_cb *self, IRIAP_EVENT event,
 398                          struct sk_buff *skb)
 399 {
 400         IRDA_DEBUG(4, "%s()\n", __func__);
 401
 402         switch (event) {
 403         case IAP_LM_DISCONNECT_INDICATION:
 404                 /* Abort call */
 405                 iriap_next_server_state(self, R_DISCONNECT);
 406                 iriap_next_r_connect_state(self, R_WAITING);
 407                 break;
 408         default:
 409                 IRDA_DEBUG(0, "%s(), unknown event!\n", __func__);
 410                 break;
 411         }
 412 }
 413
 414 /*
 415  *  R-Connect FSM
 416  */
 417
 418 /*
 419  * Function state_r_waiting (self, event, skb)
 420  */
 421 static void state_r_waiting(struct iriap_cb *self, IRIAP_EVENT event,
 422                             struct sk_buff *skb)
 423 {
 424         IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
 425 }
 426
 427 static void state_r_wait_active(struct iriap_cb *self, IRIAP_EVENT event,
 428                                 struct sk_buff *skb)
 429 {
 430         IRDA_DEBUG(0, "%s(), Not implemented\n", __func__);
 431 }
 432
 433 /*
 434  * Function state_r_receiving (self, event, skb)
 435  *
 436  *    We are receiving a command
 437  *
 438  */
 439 static void state_r_receiving(struct iriap_cb *self, IRIAP_EVENT event,
 440                               struct sk_buff *skb)
 441 {
 442         IRDA_DEBUG(4, "%s()\n", __func__);
 443
 444         switch (event) {
 445         case IAP_RECV_F_LST:
 446                 iriap_next_r_connect_state(self, R_EXECUTE);
 447
 448                 iriap_call_indication(self, skb);
 449                 break;
 450         default:
 451                 IRDA_DEBUG(0, "%s(), unknown event!\n", __func__);
 452                 break;
 453         }
 454 }
 455
 456 /*
 457  * Function state_r_execute (self, event, skb)
 458  *
 459  *    The server is processing the request
 460  *
 461  */
 462 static void state_r_execute(struct iriap_cb *self, IRIAP_EVENT event,
 463                             struct sk_buff *skb)
 464 {
 465         IRDA_DEBUG(4, "%s()\n", __func__);
 466
 467         IRDA_ASSERT(skb != NULL, return;);
 468         IRDA_ASSERT(self != NULL, return;);
 469         IRDA_ASSERT(self->magic == IAS_MAGIC, return;);
 470
 471         switch (event) {
 472         case IAP_CALL_RESPONSE:
 473                 /*
 474                  *  Since we don't implement the Waiting state, we return
 475                  *  to state Receiving instead, DB.
 476                  */
 477                 iriap_next_r_connect_state(self, R_RECEIVING);
 478
 479                 /* Don't forget to refcount it - see
 480                  * iriap_getvaluebyclass_response(). */
 481                 skb_get(skb);
 482
 483                 irlmp_data_request(self->lsap, skb);
 484                 break;
 485         default:
 486                 IRDA_DEBUG(0, "%s(), unknown event!\n", __func__);
 487                 break;
 488         }
 489 }
 490
 491 static void state_r_returning(struct iriap_cb *self, IRIAP_EVENT event,
 492                               struct sk_buff *skb)
 493 {
 494         IRDA_DEBUG(0, "%s(), event=%d\n", __func__, event);
 495
 496         switch (event) {
 497         case IAP_RECV_F_LST:
 498                 break;
 499         default:
 500                 break;
 501         }
 502 }