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   1 /*                                              -*- c-basic-offset: 8 -*-
   2  *
   3  * fw-transaction.c - core IEEE1394 transaction logic
   4  *
   5  * Copyright (C) 2004-2006 Kristian Hoegsberg <krh@bitplanet.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software Foundation,
  19  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/pci.h>
  27 #include <linux/delay.h>
  28 #include <linux/poll.h>
  29 #include <linux/list.h>
  30 #include <linux/kthread.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/semaphore.h>
  33
  34 #include "fw-transaction.h"
  35 #include "fw-topology.h"
  36 #include "fw-device.h"
  37
  38 #define header_pri(pri)                 ((pri) << 0)
  39 #define header_tcode(tcode)             ((tcode) << 4)
  40 #define header_retry(retry)             ((retry) << 8)
  41 #define header_tlabel(tlabel)           ((tlabel) << 10)
  42 #define header_destination(destination) ((destination) << 16)
  43 #define header_source(source)           ((source) << 16)
  44 #define header_rcode(rcode)             ((rcode) << 12)
  45 #define header_offset_high(offset_high) ((offset_high) << 0)
  46 #define header_data_length(length)      ((length) << 16)
  47 #define header_extended_tcode(tcode)    ((tcode) << 0)
  48
  49 #define header_get_tcode(q)             (((q) >> 4) & 0x0f)
  50 #define header_get_tlabel(q)            (((q) >> 10) & 0x3f)
  51 #define header_get_rcode(q)             (((q) >> 12) & 0x0f)
  52 #define header_get_destination(q)       (((q) >> 16) & 0xffff)
  53 #define header_get_source(q)            (((q) >> 16) & 0xffff)
  54 #define header_get_offset_high(q)       (((q) >> 0) & 0xffff)
  55 #define header_get_data_length(q)       (((q) >> 16) & 0xffff)
  56 #define header_get_extended_tcode(q)    (((q) >> 0) & 0xffff)
  57
  58 #define phy_config_gap_count(gap_count) (((gap_count) << 16) | (1 << 22))
  59 #define phy_config_root_id(node_id)     ((((node_id) & 0x3f) << 24) | (1 << 23))
  60 #define phy_identifier(id)              ((id) << 30)
  61
  62 static void
  63 close_transaction(struct fw_transaction *t, struct fw_card *card, int rcode,
  64                   u32 * payload, size_t length)
  65 {
  66         unsigned long flags;
  67
  68         spin_lock_irqsave(&card->lock, flags);
  69         card->tlabel_mask &= ~(1 << t->tlabel);
  70         list_del(&t->link);
  71         spin_unlock_irqrestore(&card->lock, flags);
  72
  73         t->callback(card, rcode, payload, length, t->callback_data);
  74 }
  75
  76 static void
  77 transmit_complete_callback(struct fw_packet *packet,
  78                            struct fw_card *card, int status)
  79 {
  80         struct fw_transaction *t =
  81             container_of(packet, struct fw_transaction, packet);
  82
  83         switch (status) {
  84         case ACK_COMPLETE:
  85                 close_transaction(t, card, RCODE_COMPLETE, NULL, 0);
  86                 break;
  87         case ACK_PENDING:
  88                 t->timestamp = packet->timestamp;
  89                 break;
  90         case ACK_BUSY_X:
  91         case ACK_BUSY_A:
  92         case ACK_BUSY_B:
  93                 close_transaction(t, card, RCODE_BUSY, NULL, 0);
  94                 break;
  95         case ACK_DATA_ERROR:
  96                 close_transaction(t, card, RCODE_DATA_ERROR, NULL, 0);
  97                 break;
  98         case ACK_TYPE_ERROR:
  99                 close_transaction(t, card, RCODE_TYPE_ERROR, NULL, 0);
 100                 break;
 101         default:
 102                 /* In this case the ack is really a juju specific
 103                  * rcode, so just forward that to the callback. */
 104                 close_transaction(t, card, status, NULL, 0);
 105                 break;
 106         }
 107 }
 108
 109 static void
 110 fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
 111                 int node_id, int generation, int speed,
 112                 unsigned long long offset, void *payload, size_t length)
 113 {
 114         int ext_tcode;
 115
 116         if (tcode > 0x10) {
 117                 ext_tcode = tcode - 0x10;
 118                 tcode = TCODE_LOCK_REQUEST;
 119         } else
 120                 ext_tcode = 0;
 121
 122         packet->header[0] =
 123                 header_retry(RETRY_X) |
 124                 header_tlabel(tlabel) |
 125                 header_tcode(tcode) |
 126                 header_destination(node_id);
 127         packet->header[1] =
 128                 header_offset_high(offset >> 32) | header_source(0);
 129         packet->header[2] =
 130                 offset;
 131
 132         switch (tcode) {
 133         case TCODE_WRITE_QUADLET_REQUEST:
 134                 packet->header[3] = *(u32 *)payload;
 135                 packet->header_length = 16;
 136                 packet->payload_length = 0;
 137                 break;
 138
 139         case TCODE_LOCK_REQUEST:
 140         case TCODE_WRITE_BLOCK_REQUEST:
 141                 packet->header[3] =
 142                         header_data_length(length) |
 143                         header_extended_tcode(ext_tcode);
 144                 packet->header_length = 16;
 145                 packet->payload = payload;
 146                 packet->payload_length = length;
 147                 break;
 148
 149         case TCODE_READ_QUADLET_REQUEST:
 150                 packet->header_length = 12;
 151                 packet->payload_length = 0;
 152                 break;
 153
 154         case TCODE_READ_BLOCK_REQUEST:
 155                 packet->header[3] =
 156                         header_data_length(length) |
 157                         header_extended_tcode(ext_tcode);
 158                 packet->header_length = 16;
 159                 packet->payload_length = 0;
 160                 break;
 161         }
 162
 163         packet->speed = speed;
 164         packet->generation = generation;
 165 }
 166
 167 /**
 168  * This function provides low-level access to the IEEE1394 transaction
 169  * logic.  Most C programs would use either fw_read(), fw_write() or
 170  * fw_lock() instead - those function are convenience wrappers for
 171  * this function.  The fw_send_request() function is primarily
 172  * provided as a flexible, one-stop entry point for languages bindings
 173  * and protocol bindings.
 174  *
 175  * FIXME: Document this function further, in particular the possible
 176  * values for rcode in the callback.  In short, we map ACK_COMPLETE to
 177  * RCODE_COMPLETE, internal errors set errno and set rcode to
 178  * RCODE_SEND_ERROR (which is out of range for standard ieee1394
 179  * rcodes).  All other rcodes are forwarded unchanged.  For all
 180  * errors, payload is NULL, length is 0.
 181  *
 182  * Can not expect the callback to be called before the function
 183  * returns, though this does happen in some cases (ACK_COMPLETE and
 184  * errors).
 185  *
 186  * The payload is only used for write requests and must not be freed
 187  * until the callback has been called.
 188  *
 189  * @param card the card from which to send the request
 190  * @param tcode the tcode for this transaction.  Do not use
 191  *   TCODE_LOCK_REQUEST directly, insted use TCODE_LOCK_MASK_SWAP
 192  *   etc. to specify tcode and ext_tcode.
 193  * @param node_id the destination node ID (bus ID and PHY ID concatenated)
 194  * @param generation the generation for which node_id is valid
 195  * @param speed the speed to use for sending the request
 196  * @param offset the 48 bit offset on the destination node
 197  * @param payload the data payload for the request subaction
 198  * @param length the length in bytes of the data to read
 199  * @param callback function to be called when the transaction is completed
 200  * @param callback_data pointer to arbitrary data, which will be
 201  *   passed to the callback
 202  */
 203 void
 204 fw_send_request(struct fw_card *card, struct fw_transaction *t,
 205                 int tcode, int node_id, int generation, int speed,
 206                 unsigned long long offset,
 207                 void *payload, size_t length,
 208                 fw_transaction_callback_t callback, void *callback_data)
 209 {
 210         unsigned long flags;
 211         int tlabel;
 212
 213         /* Bump the flush timer up 100ms first of all so we
 214          * don't race with a flush timer callback. */
 215
 216         mod_timer(&card->flush_timer, jiffies + DIV_ROUND_UP(HZ, 10));
 217
 218         /* Allocate tlabel from the bitmap and put the transaction on
 219          * the list while holding the card spinlock. */
 220
 221         spin_lock_irqsave(&card->lock, flags);
 222
 223         tlabel = card->current_tlabel;
 224         if (card->tlabel_mask & (1 << tlabel)) {
 225                 spin_unlock_irqrestore(&card->lock, flags);
 226                 callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
 227                 return;
 228         }
 229
 230         card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
 231         card->tlabel_mask |= (1 << tlabel);
 232
 233         list_add_tail(&t->link, &card->transaction_list);
 234
 235         spin_unlock_irqrestore(&card->lock, flags);
 236
 237         /* Initialize rest of transaction, fill out packet and send it. */
 238         t->node_id = node_id;
 239         t->tlabel = tlabel;
 240         t->callback = callback;
 241         t->callback_data = callback_data;
 242
 243         fw_fill_request(&t->packet, tcode, t->tlabel,
 244                         node_id, generation, speed, offset, payload, length);
 245         t->packet.callback = transmit_complete_callback;
 246
 247         card->driver->send_request(card, &t->packet);
 248 }
 249 EXPORT_SYMBOL(fw_send_request);
 250
 251 static void
 252 transmit_phy_packet_callback(struct fw_packet *packet,
 253                              struct fw_card *card, int status)
 254 {
 255         kfree(packet);
 256 }
 257
 258 static void send_phy_packet(struct fw_card *card, u32 data, int generation)
 259 {
 260         struct fw_packet *packet;
 261
 262         packet = kzalloc(sizeof *packet, GFP_ATOMIC);
 263         if (packet == NULL)
 264                 return;
 265
 266         packet->header[0] = data;
 267         packet->header[1] = ~data;
 268         packet->header_length = 8;
 269         packet->payload_length = 0;
 270         packet->speed = SCODE_100;
 271         packet->generation = generation;
 272         packet->callback = transmit_phy_packet_callback;
 273
 274         card->driver->send_request(card, packet);
 275 }
 276
 277 void fw_send_phy_config(struct fw_card *card,
 278                         int node_id, int generation, int gap_count)
 279 {
 280         u32 q;
 281
 282         q = phy_identifier(PHY_PACKET_CONFIG) |
 283                 phy_config_root_id(node_id) |
 284                 phy_config_gap_count(gap_count);
 285
 286         send_phy_packet(card, q, generation);
 287 }
 288
 289 void fw_flush_transactions(struct fw_card *card)
 290 {
 291         struct fw_transaction *t, *next;
 292         struct list_head list;
 293         unsigned long flags;
 294
 295         INIT_LIST_HEAD(&list);
 296         spin_lock_irqsave(&card->lock, flags);
 297         list_splice_init(&card->transaction_list, &list);
 298         card->tlabel_mask = 0;
 299         spin_unlock_irqrestore(&card->lock, flags);
 300
 301         list_for_each_entry_safe(t, next, &list, link)
 302                 t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
 303 }
 304
 305 static struct fw_address_handler *
 306 lookup_overlapping_address_handler(struct list_head *list,
 307                                    unsigned long long offset, size_t length)
 308 {
 309         struct fw_address_handler *handler;
 310
 311         list_for_each_entry(handler, list, link) {
 312                 if (handler->offset < offset + length &&
 313                     offset < handler->offset + handler->length)
 314                         return handler;
 315         }
 316
 317         return NULL;
 318 }
 319
 320 static struct fw_address_handler *
 321 lookup_enclosing_address_handler(struct list_head *list,
 322                                  unsigned long long offset, size_t length)
 323 {
 324         struct fw_address_handler *handler;
 325
 326         list_for_each_entry(handler, list, link) {
 327                 if (handler->offset <= offset &&
 328                     offset + length <= handler->offset + handler->length)
 329                         return handler;
 330         }
 331
 332         return NULL;
 333 }
 334
 335 static DEFINE_SPINLOCK(address_handler_lock);
 336 static LIST_HEAD(address_handler_list);
 337
 338 const struct fw_address_region fw_low_memory_region =
 339         { .start = 0x000000000000ULL, .end = 0x000100000000ULL,  };
 340 const struct fw_address_region fw_high_memory_region =
 341         { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL,  };
 342 const struct fw_address_region fw_private_region =
 343         { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL,  };
 344 const struct fw_address_region fw_csr_region =
 345         { .start = 0xfffff0000000ULL, .end = 0xfffff0000800ULL,  };
 346 const struct fw_address_region fw_unit_space_region =
 347         { .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
 348 EXPORT_SYMBOL(fw_low_memory_region);
 349 EXPORT_SYMBOL(fw_high_memory_region);
 350 EXPORT_SYMBOL(fw_private_region);
 351 EXPORT_SYMBOL(fw_csr_region);
 352 EXPORT_SYMBOL(fw_unit_space_region);
 353
 354 /**
 355  * Allocate a range of addresses in the node space of the OHCI
 356  * controller.  When a request is received that falls within the
 357  * specified address range, the specified callback is invoked.  The
 358  * parameters passed to the callback give the details of the
 359  * particular request
 360  */
 361 int
 362 fw_core_add_address_handler(struct fw_address_handler *handler,
 363                             const struct fw_address_region *region)
 364 {
 365         struct fw_address_handler *other;
 366         unsigned long flags;
 367         int ret = -EBUSY;
 368
 369         spin_lock_irqsave(&address_handler_lock, flags);
 370
 371         handler->offset = region->start;
 372         while (handler->offset + handler->length <= region->end) {
 373                 other =
 374                     lookup_overlapping_address_handler(&address_handler_list,
 375                                                        handler->offset,
 376                                                        handler->length);
 377                 if (other != NULL) {
 378                         handler->offset += other->length;
 379                 } else {
 380                         list_add_tail(&handler->link, &address_handler_list);
 381                         ret = 0;
 382                         break;
 383                 }
 384         }
 385
 386         spin_unlock_irqrestore(&address_handler_lock, flags);
 387
 388         return ret;
 389 }
 390 EXPORT_SYMBOL(fw_core_add_address_handler);
 391
 392 /**
 393  * Deallocate a range of addresses allocated with fw_allocate.  This
 394  * will call the associated callback one last time with a the special
 395  * tcode TCODE_DEALLOCATE, to let the client destroy the registered
 396  * callback data.  For convenience, the callback parameters offset and
 397  * length are set to the start and the length respectively for the
 398  * deallocated region, payload is set to NULL.
 399  */
 400 void fw_core_remove_address_handler(struct fw_address_handler *handler)
 401 {
 402         unsigned long flags;
 403
 404         spin_lock_irqsave(&address_handler_lock, flags);
 405         list_del(&handler->link);
 406         spin_unlock_irqrestore(&address_handler_lock, flags);
 407 }
 408 EXPORT_SYMBOL(fw_core_remove_address_handler);
 409
 410 struct fw_request {
 411         struct fw_packet response;
 412         u32 request_header[4];
 413         int ack;
 414         u32 length;
 415         u32 data[0];
 416 };
 417
 418 static void
 419 free_response_callback(struct fw_packet *packet,
 420                        struct fw_card *card, int status)
 421 {
 422         struct fw_request *request;
 423
 424         request = container_of(packet, struct fw_request, response);
 425         kfree(request);
 426 }
 427
 428 void
 429 fw_fill_response(struct fw_packet *response, u32 *request_header,
 430                  int rcode, void *payload, size_t length)
 431 {
 432         int tcode, tlabel, extended_tcode, source, destination;
 433
 434         tcode          = header_get_tcode(request_header[0]);
 435         tlabel         = header_get_tlabel(request_header[0]);
 436         source         = header_get_destination(request_header[0]);
 437         destination    = header_get_source(request_header[1]);
 438         extended_tcode = header_get_extended_tcode(request_header[3]);
 439
 440         response->header[0] =
 441                 header_retry(RETRY_1) |
 442                 header_tlabel(tlabel) |
 443                 header_destination(destination);
 444         response->header[1] =
 445                 header_source(source) |
 446                 header_rcode(rcode);
 447         response->header[2] = 0;
 448
 449         switch (tcode) {
 450         case TCODE_WRITE_QUADLET_REQUEST:
 451         case TCODE_WRITE_BLOCK_REQUEST:
 452                 response->header[0] |= header_tcode(TCODE_WRITE_RESPONSE);
 453                 response->header_length = 12;
 454                 response->payload_length = 0;
 455                 break;
 456
 457         case TCODE_READ_QUADLET_REQUEST:
 458                 response->header[0] |=
 459                         header_tcode(TCODE_READ_QUADLET_RESPONSE);
 460                 if (payload != NULL)
 461                         response->header[3] = *(u32 *)payload;
 462                 else
 463                         response->header[3] = 0;
 464                 response->header_length = 16;
 465                 response->payload_length = 0;
 466                 break;
 467
 468         case TCODE_READ_BLOCK_REQUEST:
 469         case TCODE_LOCK_REQUEST:
 470                 response->header[0] |= header_tcode(tcode + 2);
 471                 response->header[3] =
 472                         header_data_length(length) |
 473                         header_extended_tcode(extended_tcode);
 474                 response->header_length = 16;
 475                 response->payload = payload;
 476                 response->payload_length = length;
 477                 break;
 478
 479         default:
 480                 BUG();
 481                 return;
 482         }
 483 }
 484 EXPORT_SYMBOL(fw_fill_response);
 485
 486 static struct fw_request *
 487 allocate_request(struct fw_packet *p)
 488 {
 489         struct fw_request *request;
 490         u32 *data, length;
 491         int request_tcode, t;
 492
 493         request_tcode = header_get_tcode(p->header[0]);
 494         switch (request_tcode) {
 495         case TCODE_WRITE_QUADLET_REQUEST:
 496                 data = &p->header[3];
 497                 length = 4;
 498                 break;
 499
 500         case TCODE_WRITE_BLOCK_REQUEST:
 501         case TCODE_LOCK_REQUEST:
 502                 data = p->payload;
 503                 length = header_get_data_length(p->header[3]);
 504                 break;
 505
 506         case TCODE_READ_QUADLET_REQUEST:
 507                 data = NULL;
 508                 length = 4;
 509                 break;
 510
 511         case TCODE_READ_BLOCK_REQUEST:
 512                 data = NULL;
 513                 length = header_get_data_length(p->header[3]);
 514                 break;
 515
 516         default:
 517                 BUG();
 518                 return NULL;
 519         }
 520
 521         request = kmalloc(sizeof *request + length, GFP_ATOMIC);
 522         if (request == NULL)
 523                 return NULL;
 524
 525         t = (p->timestamp & 0x1fff) + 4000;
 526         if (t >= 8000)
 527                 t = (p->timestamp & ~0x1fff) + 0x2000 + t - 8000;
 528         else
 529                 t = (p->timestamp & ~0x1fff) + t;
 530
 531         request->response.speed = p->speed;
 532         request->response.timestamp = t;
 533         request->response.generation = p->generation;
 534         request->response.callback = free_response_callback;
 535         request->ack = p->ack;
 536         request->length = length;
 537         if (data)
 538                 memcpy(request->data, p->payload, length);
 539
 540         memcpy(request->request_header, p->header, sizeof p->header);
 541
 542         return request;
 543 }
 544
 545 void
 546 fw_send_response(struct fw_card *card, struct fw_request *request, int rcode)
 547 {
 548         /* Broadcast packets are reported as ACK_COMPLETE, so this
 549          * check is sufficient to ensure we don't send response to
 550          * broadcast packets or posted writes. */
 551         if (request->ack != ACK_PENDING)
 552                 return;
 553
 554         if (rcode == RCODE_COMPLETE)
 555                 fw_fill_response(&request->response, request->request_header,
 556                                  rcode, request->data, request->length);
 557         else
 558                 fw_fill_response(&request->response, request->request_header,
 559                                  rcode, NULL, 0);
 560
 561         card->driver->send_response(card, &request->response);
 562 }
 563 EXPORT_SYMBOL(fw_send_response);
 564
 565 void
 566 fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
 567 {
 568         struct fw_address_handler *handler;
 569         struct fw_request *request;
 570         unsigned long long offset;
 571         unsigned long flags;
 572         int tcode, destination, source;
 573
 574         if (p->payload_length > 2048) {
 575                 /* FIXME: send error response. */
 576                 return;
 577         }
 578
 579         if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
 580                 return;
 581
 582         request = allocate_request(p);
 583         if (request == NULL) {
 584                 /* FIXME: send statically allocated busy packet. */
 585                 return;
 586         }
 587
 588         offset      =
 589                 ((unsigned long long)
 590                  header_get_offset_high(p->header[1]) << 32) | p->header[2];
 591         tcode       = header_get_tcode(p->header[0]);
 592         destination = header_get_destination(p->header[0]);
 593         source      = header_get_source(p->header[0]);
 594
 595         spin_lock_irqsave(&address_handler_lock, flags);
 596         handler = lookup_enclosing_address_handler(&address_handler_list,
 597                                                    offset, request->length);
 598         spin_unlock_irqrestore(&address_handler_lock, flags);
 599
 600         /* FIXME: lookup the fw_node corresponding to the sender of
 601          * this request and pass that to the address handler instead
 602          * of the node ID.  We may also want to move the address
 603          * allocations to fw_node so we only do this callback if the
 604          * upper layers registered it for this node. */
 605
 606         if (handler == NULL)
 607                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
 608         else
 609                 handler->address_callback(card, request,
 610                                           tcode, destination, source,
 611                                           p->generation, p->speed, offset,
 612                                           request->data, request->length,
 613                                           handler->callback_data);
 614 }
 615 EXPORT_SYMBOL(fw_core_handle_request);
 616
 617 void
 618 fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
 619 {
 620         struct fw_transaction *t;
 621         unsigned long flags;
 622         u32 *data;
 623         size_t data_length;
 624         int tcode, tlabel, destination, source, rcode;
 625
 626         tcode       = header_get_tcode(p->header[0]);
 627         tlabel      = header_get_tlabel(p->header[0]);
 628         destination = header_get_destination(p->header[0]);
 629         source      = header_get_source(p->header[1]);
 630         rcode       = header_get_rcode(p->header[1]);
 631
 632         spin_lock_irqsave(&card->lock, flags);
 633         list_for_each_entry(t, &card->transaction_list, link) {
 634                 if (t->node_id == source && t->tlabel == tlabel) {
 635                         list_del(&t->link);
 636                         card->tlabel_mask &= ~(1 << t->tlabel);
 637                         break;
 638                 }
 639         }
 640         spin_unlock_irqrestore(&card->lock, flags);
 641
 642         if (&t->link == &card->transaction_list) {
 643                 fw_notify("Unsolicited response\n");
 644                 return;
 645         }
 646
 647         /* FIXME: sanity check packet, is length correct, does tcodes
 648          * and addresses match. */
 649
 650         switch (tcode) {
 651         case TCODE_READ_QUADLET_RESPONSE:
 652                 data = (u32 *) &p->header[3];
 653                 data_length = 4;
 654                 break;
 655
 656         case TCODE_WRITE_RESPONSE:
 657                 data = NULL;
 658                 data_length = 0;
 659                 break;
 660
 661         case TCODE_READ_BLOCK_RESPONSE:
 662         case TCODE_LOCK_RESPONSE:
 663                 data = p->payload;
 664                 data_length = header_get_data_length(p->header[3]);
 665                 break;
 666
 667         default:
 668                 /* Should never happen, this is just to shut up gcc. */
 669                 data = NULL;
 670                 data_length = 0;
 671                 break;
 672         }
 673
 674         t->callback(card, rcode, data, data_length, t->callback_data);
 675 }
 676 EXPORT_SYMBOL(fw_core_handle_response);
 677
 678 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
 679 MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
 680 MODULE_LICENSE("GPL");
 681
 682 static const u32 vendor_textual_descriptor_data[] = {
 683         /* textual descriptor leaf () */
 684         0x00080000,
 685         0x00000000,
 686         0x00000000,
 687         0x4c696e75,             /* L i n u */
 688         0x78204669,             /* x   F i */
 689         0x72657769,             /* r e w i */
 690         0x72652028,             /* r e   ( */
 691         0x4a554a55,             /* J U J U */
 692         0x29000000,             /* )       */
 693 };
 694
 695 static struct fw_descriptor vendor_textual_descriptor = {
 696         .length = ARRAY_SIZE(vendor_textual_descriptor_data),
 697         .key = 0x81000000,
 698         .data = vendor_textual_descriptor_data,
 699 };
 700
 701 static int __init fw_core_init(void)
 702 {
 703         int retval;
 704
 705         retval = bus_register(&fw_bus_type);
 706         if (retval < 0)
 707                 return retval;
 708
 709         /* Add the vendor textual descriptor. */
 710         retval = fw_core_add_descriptor(&vendor_textual_descriptor);
 711         BUG_ON(retval < 0);
 712
 713         return 0;
 714 }
 715
 716 static void __exit fw_core_cleanup(void)
 717 {
 718         bus_unregister(&fw_bus_type);
 719 }
 720
 721 module_init(fw_core_init);
 722 module_exit(fw_core_cleanup);