git.oblomov.eu Git - linux-2.6/blob - drivers/firewire/fw-device-cdev.c

   1 /*                                              -*- c-basic-offset: 8 -*-
   2  *
   3  * fw-device-cdev.c - Char device for device raw access
   4  *
   5  * Copyright (C) 2005-2006  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/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/wait.h>
  25 #include <linux/errno.h>
  26 #include <linux/device.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/poll.h>
  29 #include <linux/delay.h>
  30 #include <linux/mm.h>
  31 #include <linux/idr.h>
  32 #include <linux/compat.h>
  33 #include <asm/uaccess.h>
  34 #include "fw-transaction.h"
  35 #include "fw-topology.h"
  36 #include "fw-device.h"
  37 #include "fw-device-cdev.h"
  38
  39 /* dequeue_event() just kfree()'s the event, so the event has to be
  40  * the first field in the struct. */
  41
  42 struct client;
  43 struct client_resource {
  44         struct list_head link;
  45         void (*release)(struct client *client, struct client_resource *r);
  46         u32 handle;
  47 };
  48
  49 struct event {
  50         struct { void *data; size_t size; } v[2];
  51         struct list_head link;
  52 };
  53
  54 struct bus_reset {
  55         struct event event;
  56         struct fw_cdev_event_bus_reset reset;
  57 };
  58
  59 struct response {
  60         struct event event;
  61         struct fw_transaction transaction;
  62         struct client *client;
  63         struct client_resource resource;
  64         struct fw_cdev_event_response response;
  65 };
  66
  67 struct iso_interrupt {
  68         struct event event;
  69         struct fw_cdev_event_iso_interrupt interrupt;
  70 };
  71
  72 struct client {
  73         u32 version;
  74         struct fw_device *device;
  75         spinlock_t lock;
  76         u32 resource_handle;
  77         struct list_head resource_list;
  78         struct list_head event_list;
  79         wait_queue_head_t wait;
  80         u64 bus_reset_closure;
  81
  82         struct fw_iso_context *iso_context;
  83         struct fw_iso_buffer buffer;
  84         unsigned long vm_start;
  85
  86         struct list_head link;
  87 };
  88
  89 static inline void __user *
  90 u64_to_uptr(__u64 value)
  91 {
  92         return (void __user *)(unsigned long)value;
  93 }
  94
  95 static inline __u64
  96 uptr_to_u64(void __user *ptr)
  97 {
  98         return (__u64)(unsigned long)ptr;
  99 }
 100
 101 static int fw_device_op_open(struct inode *inode, struct file *file)
 102 {
 103         struct fw_device *device;
 104         struct client *client;
 105         unsigned long flags;
 106
 107         device = fw_device_from_devt(inode->i_rdev);
 108         if (device == NULL)
 109                 return -ENODEV;
 110
 111         client = kzalloc(sizeof *client, GFP_KERNEL);
 112         if (client == NULL)
 113                 return -ENOMEM;
 114
 115         client->device = fw_device_get(device);
 116         INIT_LIST_HEAD(&client->event_list);
 117         INIT_LIST_HEAD(&client->resource_list);
 118         spin_lock_init(&client->lock);
 119         init_waitqueue_head(&client->wait);
 120
 121         file->private_data = client;
 122
 123         spin_lock_irqsave(&device->card->lock, flags);
 124         list_add_tail(&client->link, &device->client_list);
 125         spin_unlock_irqrestore(&device->card->lock, flags);
 126
 127         return 0;
 128 }
 129
 130 static void queue_event(struct client *client, struct event *event,
 131                         void *data0, size_t size0, void *data1, size_t size1)
 132 {
 133         unsigned long flags;
 134
 135         event->v[0].data = data0;
 136         event->v[0].size = size0;
 137         event->v[1].data = data1;
 138         event->v[1].size = size1;
 139
 140         spin_lock_irqsave(&client->lock, flags);
 141
 142         list_add_tail(&event->link, &client->event_list);
 143         wake_up_interruptible(&client->wait);
 144
 145         spin_unlock_irqrestore(&client->lock, flags);
 146 }
 147
 148 static int
 149 dequeue_event(struct client *client, char __user *buffer, size_t count)
 150 {
 151         unsigned long flags;
 152         struct event *event;
 153         size_t size, total;
 154         int i, retval;
 155
 156         retval = wait_event_interruptible(client->wait,
 157                                           !list_empty(&client->event_list) ||
 158                                           fw_device_is_shutdown(client->device));
 159         if (retval < 0)
 160                 return retval;
 161
 162         if (list_empty(&client->event_list) &&
 163                        fw_device_is_shutdown(client->device))
 164                 return -ENODEV;
 165
 166         spin_lock_irqsave(&client->lock, flags);
 167         event = container_of(client->event_list.next, struct event, link);
 168         list_del(&event->link);
 169         spin_unlock_irqrestore(&client->lock, flags);
 170
 171         total = 0;
 172         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 173                 size = min(event->v[i].size, count - total);
 174                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 175                         retval = -EFAULT;
 176                         goto out;
 177                 }
 178                 total += size;
 179         }
 180         retval = total;
 181
 182  out:
 183         kfree(event);
 184
 185         return retval;
 186 }
 187
 188 static ssize_t
 189 fw_device_op_read(struct file *file,
 190                   char __user *buffer, size_t count, loff_t *offset)
 191 {
 192         struct client *client = file->private_data;
 193
 194         return dequeue_event(client, buffer, count);
 195 }
 196
 197 static void
 198 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 199                      struct client *client)
 200 {
 201         struct fw_card *card = client->device->card;
 202
 203         event->closure       = client->bus_reset_closure;
 204         event->type          = FW_CDEV_EVENT_BUS_RESET;
 205         event->node_id       = client->device->node_id;
 206         event->local_node_id = card->local_node->node_id;
 207         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 208         event->irm_node_id   = card->irm_node->node_id;
 209         event->root_node_id  = card->root_node->node_id;
 210         event->generation    = card->generation;
 211 }
 212
 213 static void
 214 for_each_client(struct fw_device *device,
 215                 void (*callback)(struct client *client))
 216 {
 217         struct fw_card *card = device->card;
 218         struct client *c;
 219         unsigned long flags;
 220
 221         spin_lock_irqsave(&card->lock, flags);
 222
 223         list_for_each_entry(c, &device->client_list, link)
 224                 callback(c);
 225
 226         spin_unlock_irqrestore(&card->lock, flags);
 227 }
 228
 229 static void
 230 queue_bus_reset_event(struct client *client)
 231 {
 232         struct bus_reset *bus_reset;
 233
 234         bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC);
 235         if (bus_reset == NULL) {
 236                 fw_notify("Out of memory when allocating bus reset event\n");
 237                 return;
 238         }
 239
 240         fill_bus_reset_event(&bus_reset->reset, client);
 241
 242         queue_event(client, &bus_reset->event,
 243                     &bus_reset->reset, sizeof bus_reset->reset, NULL, 0);
 244 }
 245
 246 void fw_device_cdev_update(struct fw_device *device)
 247 {
 248         for_each_client(device, queue_bus_reset_event);
 249 }
 250
 251 static void wake_up_client(struct client *client)
 252 {
 253         wake_up_interruptible(&client->wait);
 254 }
 255
 256 void fw_device_cdev_remove(struct fw_device *device)
 257 {
 258         for_each_client(device, wake_up_client);
 259 }
 260
 261 static int ioctl_get_info(struct client *client, void __user *arg)
 262 {
 263         struct fw_cdev_get_info get_info;
 264         struct fw_cdev_event_bus_reset bus_reset;
 265
 266         if (copy_from_user(&get_info, arg, sizeof get_info))
 267                 return -EFAULT;
 268
 269         client->version = get_info.version;
 270         get_info.version = FW_CDEV_VERSION;
 271
 272         if (get_info.rom != 0) {
 273                 void __user *uptr = u64_to_uptr(get_info.rom);
 274                 size_t want = get_info.rom_length;
 275                 size_t have = client->device->config_rom_length * 4;
 276
 277                 if (copy_to_user(uptr, client->device->config_rom,
 278                                  min(want, have)))
 279                         return -EFAULT;
 280         }
 281         get_info.rom_length = client->device->config_rom_length * 4;
 282
 283         client->bus_reset_closure = get_info.bus_reset_closure;
 284         if (get_info.bus_reset != 0) {
 285                 void __user *uptr = u64_to_uptr(get_info.bus_reset);
 286
 287                 fill_bus_reset_event(&bus_reset, client);
 288                 if (copy_to_user(uptr, &bus_reset, sizeof bus_reset))
 289                         return -EFAULT;
 290         }
 291
 292         get_info.card = client->device->card->index;
 293
 294         if (copy_to_user(arg, &get_info, sizeof get_info))
 295                 return -EFAULT;
 296
 297         return 0;
 298 }
 299
 300 static void
 301 add_client_resource(struct client *client, struct client_resource *resource)
 302 {
 303         unsigned long flags;
 304
 305         spin_lock_irqsave(&client->lock, flags);
 306         list_add_tail(&resource->link, &client->resource_list);
 307         resource->handle = client->resource_handle++;
 308         spin_unlock_irqrestore(&client->lock, flags);
 309 }
 310
 311 static int
 312 release_client_resource(struct client *client, u32 handle,
 313                         struct client_resource **resource)
 314 {
 315         struct client_resource *r;
 316         unsigned long flags;
 317
 318         spin_lock_irqsave(&client->lock, flags);
 319         list_for_each_entry(r, &client->resource_list, link) {
 320                 if (r->handle == handle) {
 321                         list_del(&r->link);
 322                         break;
 323                 }
 324         }
 325         spin_unlock_irqrestore(&client->lock, flags);
 326
 327         if (&r->link == &client->resource_list)
 328                 return -EINVAL;
 329
 330         if (resource)
 331                 *resource = r;
 332         else
 333                 r->release(client, r);
 334
 335         return 0;
 336 }
 337
 338 static void
 339 release_transaction(struct client *client, struct client_resource *resource)
 340 {
 341         struct response *response =
 342                 container_of(resource, struct response, resource);
 343
 344         fw_cancel_transaction(client->device->card, &response->transaction);
 345 }
 346
 347 static void
 348 complete_transaction(struct fw_card *card, int rcode,
 349                      void *payload, size_t length, void *data)
 350 {
 351         struct response *response = data;
 352         struct client *client = response->client;
 353         unsigned long flags;
 354
 355         if (length < response->response.length)
 356                 response->response.length = length;
 357         if (rcode == RCODE_COMPLETE)
 358                 memcpy(response->response.data, payload,
 359                        response->response.length);
 360
 361         spin_lock_irqsave(&client->lock, flags);
 362         list_del(&response->resource.link);
 363         spin_unlock_irqrestore(&client->lock, flags);
 364
 365         response->response.type   = FW_CDEV_EVENT_RESPONSE;
 366         response->response.rcode  = rcode;
 367         queue_event(client, &response->event,
 368                     &response->response, sizeof response->response,
 369                     response->response.data, response->response.length);
 370 }
 371
 372 static ssize_t ioctl_send_request(struct client *client, void __user *arg)
 373 {
 374         struct fw_device *device = client->device;
 375         struct fw_cdev_send_request request;
 376         struct response *response;
 377
 378         if (copy_from_user(&request, arg, sizeof request))
 379                 return -EFAULT;
 380
 381         /* What is the biggest size we'll accept, really? */
 382         if (request.length > 4096)
 383                 return -EINVAL;
 384
 385         response = kmalloc(sizeof *response + request.length, GFP_KERNEL);
 386         if (response == NULL)
 387                 return -ENOMEM;
 388
 389         response->client = client;
 390         response->response.length = request.length;
 391         response->response.closure = request.closure;
 392
 393         if (request.data &&
 394             copy_from_user(response->response.data,
 395                            u64_to_uptr(request.data), request.length)) {
 396                 kfree(response);
 397                 return -EFAULT;
 398         }
 399
 400         response->resource.release = release_transaction;
 401         add_client_resource(client, &response->resource);
 402
 403         fw_send_request(device->card, &response->transaction,
 404                         request.tcode & 0x1f,
 405                         device->node->node_id,
 406                         request.generation,
 407                         device->node->max_speed,
 408                         request.offset,
 409                         response->response.data, request.length,
 410                         complete_transaction, response);
 411
 412         if (request.data)
 413                 return sizeof request + request.length;
 414         else
 415                 return sizeof request;
 416 }
 417
 418 struct address_handler {
 419         struct fw_address_handler handler;
 420         __u64 closure;
 421         struct client *client;
 422         struct client_resource resource;
 423 };
 424
 425 struct request {
 426         struct fw_request *request;
 427         void *data;
 428         size_t length;
 429         struct client_resource resource;
 430 };
 431
 432 struct request_event {
 433         struct event event;
 434         struct fw_cdev_event_request request;
 435 };
 436
 437 static void
 438 release_request(struct client *client, struct client_resource *resource)
 439 {
 440         struct request *request =
 441                 container_of(resource, struct request, resource);
 442
 443         fw_send_response(client->device->card, request->request,
 444                          RCODE_CONFLICT_ERROR);
 445         kfree(request);
 446 }
 447
 448 static void
 449 handle_request(struct fw_card *card, struct fw_request *r,
 450                int tcode, int destination, int source,
 451                int generation, int speed,
 452                unsigned long long offset,
 453                void *payload, size_t length, void *callback_data)
 454 {
 455         struct address_handler *handler = callback_data;
 456         struct request *request;
 457         struct request_event *e;
 458         struct client *client = handler->client;
 459
 460         request = kmalloc(sizeof *request, GFP_ATOMIC);
 461         e = kmalloc(sizeof *e, GFP_ATOMIC);
 462         if (request == NULL || e == NULL) {
 463                 kfree(request);
 464                 kfree(e);
 465                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
 466                 return;
 467         }
 468
 469         request->request = r;
 470         request->data    = payload;
 471         request->length  = length;
 472
 473         request->resource.release = release_request;
 474         add_client_resource(client, &request->resource);
 475
 476         e->request.type    = FW_CDEV_EVENT_REQUEST;
 477         e->request.tcode   = tcode;
 478         e->request.offset  = offset;
 479         e->request.length  = length;
 480         e->request.handle  = request->resource.handle;
 481         e->request.closure = handler->closure;
 482
 483         queue_event(client, &e->event,
 484                     &e->request, sizeof e->request, payload, length);
 485 }
 486
 487 static void
 488 release_address_handler(struct client *client,
 489                         struct client_resource *resource)
 490 {
 491         struct address_handler *handler =
 492                 container_of(resource, struct address_handler, resource);
 493
 494         fw_core_remove_address_handler(&handler->handler);
 495         kfree(handler);
 496 }
 497
 498 static int ioctl_allocate(struct client *client, void __user *arg)
 499 {
 500         struct fw_cdev_allocate request;
 501         struct address_handler *handler;
 502         struct fw_address_region region;
 503
 504         if (copy_from_user(&request, arg, sizeof request))
 505                 return -EFAULT;
 506
 507         handler = kmalloc(sizeof *handler, GFP_KERNEL);
 508         if (handler == NULL)
 509                 return -ENOMEM;
 510
 511         region.start = request.offset;
 512         region.end = request.offset + request.length;
 513         handler->handler.length = request.length;
 514         handler->handler.address_callback = handle_request;
 515         handler->handler.callback_data = handler;
 516         handler->closure = request.closure;
 517         handler->client = client;
 518
 519         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
 520                 kfree(handler);
 521                 return -EBUSY;
 522         }
 523
 524         handler->resource.release = release_address_handler;
 525         add_client_resource(client, &handler->resource);
 526         request.handle = handler->resource.handle;
 527
 528         if (copy_to_user(arg, &request, sizeof request))
 529                 return -EFAULT;
 530
 531         return 0;
 532 }
 533
 534 static int ioctl_deallocate(struct client *client, void __user *arg)
 535 {
 536         struct fw_cdev_deallocate request;
 537
 538         if (copy_from_user(&request, arg, sizeof request))
 539                 return -EFAULT;
 540
 541         return release_client_resource(client, request.handle, NULL);
 542 }
 543
 544 static int ioctl_send_response(struct client *client, void __user *arg)
 545 {
 546         struct fw_cdev_send_response request;
 547         struct client_resource *resource;
 548         struct request *r;
 549
 550         if (copy_from_user(&request, arg, sizeof request))
 551                 return -EFAULT;
 552         if (release_client_resource(client, request.handle, &resource) < 0)
 553                 return -EINVAL;
 554         r = container_of(resource, struct request, resource);
 555         if (request.length < r->length)
 556                 r->length = request.length;
 557         if (copy_from_user(r->data, u64_to_uptr(request.data), r->length))
 558                 return -EFAULT;
 559
 560         fw_send_response(client->device->card, r->request, request.rcode);
 561         kfree(r);
 562
 563         return 0;
 564 }
 565
 566 static int ioctl_initiate_bus_reset(struct client *client, void __user *arg)
 567 {
 568         struct fw_cdev_initiate_bus_reset request;
 569         int short_reset;
 570
 571         if (copy_from_user(&request, arg, sizeof request))
 572                 return -EFAULT;
 573
 574         short_reset = (request.type == FW_CDEV_SHORT_RESET);
 575
 576         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 577 }
 578
 579 struct descriptor {
 580         struct fw_descriptor d;
 581         struct client_resource resource;
 582         u32 data[0];
 583 };
 584
 585 static void release_descriptor(struct client *client,
 586                                struct client_resource *resource)
 587 {
 588         struct descriptor *descriptor =
 589                 container_of(resource, struct descriptor, resource);
 590
 591         fw_core_remove_descriptor(&descriptor->d);
 592         kfree(descriptor);
 593 }
 594
 595 static int ioctl_add_descriptor(struct client *client, void __user *arg)
 596 {
 597         struct fw_cdev_add_descriptor request;
 598         struct descriptor *descriptor;
 599         int retval;
 600
 601         if (copy_from_user(&request, arg, sizeof request))
 602                 return -EFAULT;
 603
 604         if (request.length > 256)
 605                 return -EINVAL;
 606
 607         descriptor =
 608                 kmalloc(sizeof *descriptor + request.length * 4, GFP_KERNEL);
 609         if (descriptor == NULL)
 610                 return -ENOMEM;
 611
 612         if (copy_from_user(descriptor->data,
 613                            u64_to_uptr(request.data), request.length * 4)) {
 614                 kfree(descriptor);
 615                 return -EFAULT;
 616         }
 617
 618         descriptor->d.length = request.length;
 619         descriptor->d.immediate = request.immediate;
 620         descriptor->d.key = request.key;
 621         descriptor->d.data = descriptor->data;
 622
 623         retval = fw_core_add_descriptor(&descriptor->d);
 624         if (retval < 0) {
 625                 kfree(descriptor);
 626                 return retval;
 627         }
 628
 629         descriptor->resource.release = release_descriptor;
 630         add_client_resource(client, &descriptor->resource);
 631         request.handle = descriptor->resource.handle;
 632
 633         if (copy_to_user(arg, &request, sizeof request))
 634                 return -EFAULT;
 635
 636         return 0;
 637 }
 638
 639 static int ioctl_remove_descriptor(struct client *client, void __user *arg)
 640 {
 641         struct fw_cdev_remove_descriptor request;
 642
 643         if (copy_from_user(&request, arg, sizeof request))
 644                 return -EFAULT;
 645
 646         return release_client_resource(client, request.handle, NULL);
 647 }
 648
 649 static void
 650 iso_callback(struct fw_iso_context *context, u32 cycle,
 651              size_t header_length, void *header, void *data)
 652 {
 653         struct client *client = data;
 654         struct iso_interrupt *interrupt;
 655
 656         interrupt = kzalloc(sizeof *interrupt + header_length, GFP_ATOMIC);
 657         if (interrupt == NULL)
 658                 return;
 659
 660         interrupt->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 661         interrupt->interrupt.closure   = 0;
 662         interrupt->interrupt.cycle     = cycle;
 663         interrupt->interrupt.header_length = header_length;
 664         memcpy(interrupt->interrupt.header, header, header_length);
 665         queue_event(client, &interrupt->event,
 666                     &interrupt->interrupt,
 667                     sizeof interrupt->interrupt + header_length, NULL, 0);
 668 }
 669
 670 static int ioctl_create_iso_context(struct client *client, void __user *arg)
 671 {
 672         struct fw_cdev_create_iso_context request;
 673
 674         if (copy_from_user(&request, arg, sizeof request))
 675                 return -EFAULT;
 676
 677         if (request.channel > 63)
 678                 return -EINVAL;
 679
 680         switch (request.type) {
 681         case FW_ISO_CONTEXT_RECEIVE:
 682                 if (request.header_size < 4 || (request.header_size & 3))
 683                         return -EINVAL;
 684
 685                 break;
 686
 687         case FW_ISO_CONTEXT_TRANSMIT:
 688                 if (request.speed > SCODE_3200)
 689                         return -EINVAL;
 690
 691                 break;
 692
 693         default:
 694                 return -EINVAL;
 695         }
 696
 697         client->iso_context = fw_iso_context_create(client->device->card,
 698                                                     request.type,
 699                                                     request.channel,
 700                                                     request.speed,
 701                                                     request.header_size,
 702                                                     iso_callback, client);
 703         if (IS_ERR(client->iso_context))
 704                 return PTR_ERR(client->iso_context);
 705
 706         return 0;
 707 }
 708
 709 static int ioctl_queue_iso(struct client *client, void __user *arg)
 710 {
 711         struct fw_cdev_queue_iso request;
 712         struct fw_cdev_iso_packet __user *p, *end, *next;
 713         struct fw_iso_context *ctx = client->iso_context;
 714         unsigned long payload, buffer_end, header_length;
 715         int count;
 716         struct {
 717                 struct fw_iso_packet packet;
 718                 u8 header[256];
 719         } u;
 720
 721         if (ctx == NULL)
 722                 return -EINVAL;
 723         if (copy_from_user(&request, arg, sizeof request))
 724                 return -EFAULT;
 725
 726         /* If the user passes a non-NULL data pointer, has mmap()'ed
 727          * the iso buffer, and the pointer points inside the buffer,
 728          * we setup the payload pointers accordingly.  Otherwise we
 729          * set them both to 0, which will still let packets with
 730          * payload_length == 0 through.  In other words, if no packets
 731          * use the indirect payload, the iso buffer need not be mapped
 732          * and the request.data pointer is ignored.*/
 733
 734         payload = (unsigned long)request.data - client->vm_start;
 735         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 736         if (request.data == 0 || client->buffer.pages == NULL ||
 737             payload >= buffer_end) {
 738                 payload = 0;
 739                 buffer_end = 0;
 740         }
 741
 742         if (!access_ok(VERIFY_READ, request.packets, request.size))
 743                 return -EFAULT;
 744
 745         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request.packets);
 746         end = (void __user *)p + request.size;
 747         count = 0;
 748         while (p < end) {
 749                 if (__copy_from_user(&u.packet, p, sizeof *p))
 750                         return -EFAULT;
 751
 752                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 753                         header_length = u.packet.header_length;
 754                 } else {
 755                         /* We require that header_length is a multiple of
 756                          * the fixed header size, ctx->header_size */
 757                         if (ctx->header_size == 0) {
 758                                 if (u.packet.header_length > 0)
 759                                         return -EINVAL;
 760                         } else if (u.packet.header_length % ctx->header_size != 0) {
 761                                 return -EINVAL;
 762                         }
 763                         header_length = 0;
 764                 }
 765
 766                 next = (struct fw_cdev_iso_packet __user *)
 767                         &p->header[header_length / 4];
 768                 if (next > end)
 769                         return -EINVAL;
 770                 if (__copy_from_user
 771                     (u.packet.header, p->header, header_length))
 772                         return -EFAULT;
 773                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 774                     u.packet.header_length + u.packet.payload_length > 0)
 775                         return -EINVAL;
 776                 if (payload + u.packet.payload_length > buffer_end)
 777                         return -EINVAL;
 778
 779                 if (fw_iso_context_queue(ctx, &u.packet,
 780                                          &client->buffer, payload))
 781                         break;
 782
 783                 p = next;
 784                 payload += u.packet.payload_length;
 785                 count++;
 786         }
 787
 788         request.size    -= uptr_to_u64(p) - request.packets;
 789         request.packets  = uptr_to_u64(p);
 790         request.data     = client->vm_start + payload;
 791
 792         if (copy_to_user(arg, &request, sizeof request))
 793                 return -EFAULT;
 794
 795         return count;
 796 }
 797
 798 static int ioctl_start_iso(struct client *client, void __user *arg)
 799 {
 800         struct fw_cdev_start_iso request;
 801
 802         if (copy_from_user(&request, arg, sizeof request))
 803                 return -EFAULT;
 804
 805         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 806                 if (request.tags == 0 || request.tags > 15)
 807                         return -EINVAL;
 808
 809                 if (request.sync > 15)
 810                         return -EINVAL;
 811         }
 812
 813         return fw_iso_context_start(client->iso_context,
 814                                     request.cycle, request.sync, request.tags);
 815 }
 816
 817 static int ioctl_stop_iso(struct client *client, void __user *arg)
 818 {
 819         return fw_iso_context_stop(client->iso_context);
 820 }
 821
 822 static int
 823 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
 824 {
 825         switch (cmd) {
 826         case FW_CDEV_IOC_GET_INFO:
 827                 return ioctl_get_info(client, arg);
 828         case FW_CDEV_IOC_SEND_REQUEST:
 829                 return ioctl_send_request(client, arg);
 830         case FW_CDEV_IOC_ALLOCATE:
 831                 return ioctl_allocate(client, arg);
 832         case FW_CDEV_IOC_DEALLOCATE:
 833                 return ioctl_deallocate(client, arg);
 834         case FW_CDEV_IOC_SEND_RESPONSE:
 835                 return ioctl_send_response(client, arg);
 836         case FW_CDEV_IOC_INITIATE_BUS_RESET:
 837                 return ioctl_initiate_bus_reset(client, arg);
 838         case FW_CDEV_IOC_ADD_DESCRIPTOR:
 839                 return ioctl_add_descriptor(client, arg);
 840         case FW_CDEV_IOC_REMOVE_DESCRIPTOR:
 841                 return ioctl_remove_descriptor(client, arg);
 842         case FW_CDEV_IOC_CREATE_ISO_CONTEXT:
 843                 return ioctl_create_iso_context(client, arg);
 844         case FW_CDEV_IOC_QUEUE_ISO:
 845                 return ioctl_queue_iso(client, arg);
 846         case FW_CDEV_IOC_START_ISO:
 847                 return ioctl_start_iso(client, arg);
 848         case FW_CDEV_IOC_STOP_ISO:
 849                 return ioctl_stop_iso(client, arg);
 850         default:
 851                 return -EINVAL;
 852         }
 853 }
 854
 855 static long
 856 fw_device_op_ioctl(struct file *file,
 857                    unsigned int cmd, unsigned long arg)
 858 {
 859         struct client *client = file->private_data;
 860
 861         return dispatch_ioctl(client, cmd, (void __user *) arg);
 862 }
 863
 864 #ifdef CONFIG_COMPAT
 865 static long
 866 fw_device_op_compat_ioctl(struct file *file,
 867                           unsigned int cmd, unsigned long arg)
 868 {
 869         struct client *client = file->private_data;
 870
 871         return dispatch_ioctl(client, cmd, compat_ptr(arg));
 872 }
 873 #endif
 874
 875 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 876 {
 877         struct client *client = file->private_data;
 878         enum dma_data_direction direction;
 879         unsigned long size;
 880         int page_count, retval;
 881
 882         /* FIXME: We could support multiple buffers, but we don't. */
 883         if (client->buffer.pages != NULL)
 884                 return -EBUSY;
 885
 886         if (!(vma->vm_flags & VM_SHARED))
 887                 return -EINVAL;
 888
 889         if (vma->vm_start & ~PAGE_MASK)
 890                 return -EINVAL;
 891
 892         client->vm_start = vma->vm_start;
 893         size = vma->vm_end - vma->vm_start;
 894         page_count = size >> PAGE_SHIFT;
 895         if (size & ~PAGE_MASK)
 896                 return -EINVAL;
 897
 898         if (vma->vm_flags & VM_WRITE)
 899                 direction = DMA_TO_DEVICE;
 900         else
 901                 direction = DMA_FROM_DEVICE;
 902
 903         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
 904                                     page_count, direction);
 905         if (retval < 0)
 906                 return retval;
 907
 908         retval = fw_iso_buffer_map(&client->buffer, vma);
 909         if (retval < 0)
 910                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 911
 912         return retval;
 913 }
 914
 915 static int fw_device_op_release(struct inode *inode, struct file *file)
 916 {
 917         struct client *client = file->private_data;
 918         struct event *e, *next_e;
 919         struct client_resource *r, *next_r;
 920         unsigned long flags;
 921
 922         if (client->buffer.pages)
 923                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 924
 925         if (client->iso_context)
 926                 fw_iso_context_destroy(client->iso_context);
 927
 928         list_for_each_entry_safe(r, next_r, &client->resource_list, link)
 929                 r->release(client, r);
 930
 931         /* FIXME: We should wait for the async tasklets to stop
 932          * running before freeing the memory. */
 933
 934         list_for_each_entry_safe(e, next_e, &client->event_list, link)
 935                 kfree(e);
 936
 937         spin_lock_irqsave(&client->device->card->lock, flags);
 938         list_del(&client->link);
 939         spin_unlock_irqrestore(&client->device->card->lock, flags);
 940
 941         fw_device_put(client->device);
 942         kfree(client);
 943
 944         return 0;
 945 }
 946
 947 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
 948 {
 949         struct client *client = file->private_data;
 950         unsigned int mask = 0;
 951
 952         poll_wait(file, &client->wait, pt);
 953
 954         if (fw_device_is_shutdown(client->device))
 955                 mask |= POLLHUP | POLLERR;
 956         if (!list_empty(&client->event_list))
 957                 mask |= POLLIN | POLLRDNORM;
 958
 959         return mask;
 960 }
 961
 962 const struct file_operations fw_device_ops = {
 963         .owner          = THIS_MODULE,
 964         .open           = fw_device_op_open,
 965         .read           = fw_device_op_read,
 966         .unlocked_ioctl = fw_device_op_ioctl,
 967         .poll           = fw_device_op_poll,
 968         .release        = fw_device_op_release,
 969         .mmap           = fw_device_op_mmap,
 970
 971 #ifdef CONFIG_COMPAT
 972         .compat_ioctl   = fw_device_op_compat_ioctl,
 973 #endif
 974 };