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

   1 /*
   2  * Char device for device raw access
   3  *
   4  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/wait.h>
  24 #include <linux/errno.h>
  25 #include <linux/device.h>
  26 #include <linux/vmalloc.h>
  27 #include <linux/poll.h>
  28 #include <linux/preempt.h>
  29 #include <linux/time.h>
  30 #include <linux/delay.h>
  31 #include <linux/mm.h>
  32 #include <linux/idr.h>
  33 #include <linux/compat.h>
  34 #include <linux/firewire-cdev.h>
  35 #include <asm/system.h>
  36 #include <asm/uaccess.h>
  37 #include "fw-transaction.h"
  38 #include "fw-topology.h"
  39 #include "fw-device.h"
  40
  41 struct client;
  42 struct client_resource {
  43         struct list_head link;
  44         void (*release)(struct client *client, struct client_resource *r);
  45         u32 handle;
  46 };
  47
  48 /*
  49  * dequeue_event() just kfree()'s the event, so the event has to be
  50  * the first field in the struct.
  51  */
  52
  53 struct event {
  54         struct { void *data; size_t size; } v[2];
  55         struct list_head link;
  56 };
  57
  58 struct bus_reset {
  59         struct event event;
  60         struct fw_cdev_event_bus_reset reset;
  61 };
  62
  63 struct response {
  64         struct event event;
  65         struct fw_transaction transaction;
  66         struct client *client;
  67         struct client_resource resource;
  68         struct fw_cdev_event_response response;
  69 };
  70
  71 struct iso_interrupt {
  72         struct event event;
  73         struct fw_cdev_event_iso_interrupt interrupt;
  74 };
  75
  76 struct client {
  77         u32 version;
  78         struct fw_device *device;
  79         spinlock_t lock;
  80         u32 resource_handle;
  81         struct list_head resource_list;
  82         struct list_head event_list;
  83         wait_queue_head_t wait;
  84         u64 bus_reset_closure;
  85
  86         struct fw_iso_context *iso_context;
  87         u64 iso_closure;
  88         struct fw_iso_buffer buffer;
  89         unsigned long vm_start;
  90
  91         struct list_head link;
  92 };
  93
  94 static inline void __user *
  95 u64_to_uptr(__u64 value)
  96 {
  97         return (void __user *)(unsigned long)value;
  98 }
  99
 100 static inline __u64
 101 uptr_to_u64(void __user *ptr)
 102 {
 103         return (__u64)(unsigned long)ptr;
 104 }
 105
 106 static int fw_device_op_open(struct inode *inode, struct file *file)
 107 {
 108         struct fw_device *device;
 109         struct client *client;
 110         unsigned long flags;
 111
 112         device = fw_device_get_by_devt(inode->i_rdev);
 113         if (device == NULL)
 114                 return -ENODEV;
 115
 116         if (fw_device_is_shutdown(device)) {
 117                 fw_device_put(device);
 118                 return -ENODEV;
 119         }
 120
 121         client = kzalloc(sizeof(*client), GFP_KERNEL);
 122         if (client == NULL) {
 123                 fw_device_put(device);
 124                 return -ENOMEM;
 125         }
 126
 127         client->device = device;
 128         INIT_LIST_HEAD(&client->event_list);
 129         INIT_LIST_HEAD(&client->resource_list);
 130         spin_lock_init(&client->lock);
 131         init_waitqueue_head(&client->wait);
 132
 133         file->private_data = client;
 134
 135         spin_lock_irqsave(&device->card->lock, flags);
 136         list_add_tail(&client->link, &device->client_list);
 137         spin_unlock_irqrestore(&device->card->lock, flags);
 138
 139         return 0;
 140 }
 141
 142 static void queue_event(struct client *client, struct event *event,
 143                         void *data0, size_t size0, void *data1, size_t size1)
 144 {
 145         unsigned long flags;
 146
 147         event->v[0].data = data0;
 148         event->v[0].size = size0;
 149         event->v[1].data = data1;
 150         event->v[1].size = size1;
 151
 152         spin_lock_irqsave(&client->lock, flags);
 153         list_add_tail(&event->link, &client->event_list);
 154         spin_unlock_irqrestore(&client->lock, flags);
 155
 156         wake_up_interruptible(&client->wait);
 157 }
 158
 159 static int
 160 dequeue_event(struct client *client, char __user *buffer, size_t count)
 161 {
 162         unsigned long flags;
 163         struct event *event;
 164         size_t size, total;
 165         int i, retval;
 166
 167         retval = wait_event_interruptible(client->wait,
 168                                           !list_empty(&client->event_list) ||
 169                                           fw_device_is_shutdown(client->device));
 170         if (retval < 0)
 171                 return retval;
 172
 173         if (list_empty(&client->event_list) &&
 174                        fw_device_is_shutdown(client->device))
 175                 return -ENODEV;
 176
 177         spin_lock_irqsave(&client->lock, flags);
 178         event = container_of(client->event_list.next, struct event, link);
 179         list_del(&event->link);
 180         spin_unlock_irqrestore(&client->lock, flags);
 181
 182         total = 0;
 183         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 184                 size = min(event->v[i].size, count - total);
 185                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 186                         retval = -EFAULT;
 187                         goto out;
 188                 }
 189                 total += size;
 190         }
 191         retval = total;
 192
 193  out:
 194         kfree(event);
 195
 196         return retval;
 197 }
 198
 199 static ssize_t
 200 fw_device_op_read(struct file *file,
 201                   char __user *buffer, size_t count, loff_t *offset)
 202 {
 203         struct client *client = file->private_data;
 204
 205         return dequeue_event(client, buffer, count);
 206 }
 207
 208 /* caller must hold card->lock so that node pointers can be dereferenced here */
 209 static void
 210 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 211                      struct client *client)
 212 {
 213         struct fw_card *card = client->device->card;
 214
 215         event->closure       = client->bus_reset_closure;
 216         event->type          = FW_CDEV_EVENT_BUS_RESET;
 217         event->generation    = client->device->generation;
 218         event->node_id       = client->device->node_id;
 219         event->local_node_id = card->local_node->node_id;
 220         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 221         event->irm_node_id   = card->irm_node->node_id;
 222         event->root_node_id  = card->root_node->node_id;
 223 }
 224
 225 static void
 226 for_each_client(struct fw_device *device,
 227                 void (*callback)(struct client *client))
 228 {
 229         struct fw_card *card = device->card;
 230         struct client *c;
 231         unsigned long flags;
 232
 233         spin_lock_irqsave(&card->lock, flags);
 234
 235         list_for_each_entry(c, &device->client_list, link)
 236                 callback(c);
 237
 238         spin_unlock_irqrestore(&card->lock, flags);
 239 }
 240
 241 static void
 242 queue_bus_reset_event(struct client *client)
 243 {
 244         struct bus_reset *bus_reset;
 245
 246         bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
 247         if (bus_reset == NULL) {
 248                 fw_notify("Out of memory when allocating bus reset event\n");
 249                 return;
 250         }
 251
 252         fill_bus_reset_event(&bus_reset->reset, client);
 253
 254         queue_event(client, &bus_reset->event,
 255                     &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
 256 }
 257
 258 void fw_device_cdev_update(struct fw_device *device)
 259 {
 260         for_each_client(device, queue_bus_reset_event);
 261 }
 262
 263 static void wake_up_client(struct client *client)
 264 {
 265         wake_up_interruptible(&client->wait);
 266 }
 267
 268 void fw_device_cdev_remove(struct fw_device *device)
 269 {
 270         for_each_client(device, wake_up_client);
 271 }
 272
 273 static int ioctl_get_info(struct client *client, void *buffer)
 274 {
 275         struct fw_cdev_get_info *get_info = buffer;
 276         struct fw_cdev_event_bus_reset bus_reset;
 277         struct fw_card *card = client->device->card;
 278         unsigned long ret = 0;
 279
 280         client->version = get_info->version;
 281         get_info->version = FW_CDEV_VERSION;
 282
 283         down_read(&fw_device_rwsem);
 284
 285         if (get_info->rom != 0) {
 286                 void __user *uptr = u64_to_uptr(get_info->rom);
 287                 size_t want = get_info->rom_length;
 288                 size_t have = client->device->config_rom_length * 4;
 289
 290                 ret = copy_to_user(uptr, client->device->config_rom,
 291                                    min(want, have));
 292         }
 293         get_info->rom_length = client->device->config_rom_length * 4;
 294
 295         up_read(&fw_device_rwsem);
 296
 297         if (ret != 0)
 298                 return -EFAULT;
 299
 300         client->bus_reset_closure = get_info->bus_reset_closure;
 301         if (get_info->bus_reset != 0) {
 302                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 303                 unsigned long flags;
 304
 305                 spin_lock_irqsave(&card->lock, flags);
 306                 fill_bus_reset_event(&bus_reset, client);
 307                 spin_unlock_irqrestore(&card->lock, flags);
 308
 309                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 310                         return -EFAULT;
 311         }
 312
 313         get_info->card = card->index;
 314
 315         return 0;
 316 }
 317
 318 static void
 319 add_client_resource(struct client *client, struct client_resource *resource)
 320 {
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&client->lock, flags);
 324         list_add_tail(&resource->link, &client->resource_list);
 325         resource->handle = client->resource_handle++;
 326         spin_unlock_irqrestore(&client->lock, flags);
 327 }
 328
 329 static int
 330 release_client_resource(struct client *client, u32 handle,
 331                         struct client_resource **resource)
 332 {
 333         struct client_resource *r;
 334         unsigned long flags;
 335
 336         spin_lock_irqsave(&client->lock, flags);
 337         list_for_each_entry(r, &client->resource_list, link) {
 338                 if (r->handle == handle) {
 339                         list_del(&r->link);
 340                         break;
 341                 }
 342         }
 343         spin_unlock_irqrestore(&client->lock, flags);
 344
 345         if (&r->link == &client->resource_list)
 346                 return -EINVAL;
 347
 348         if (resource)
 349                 *resource = r;
 350         else
 351                 r->release(client, r);
 352
 353         return 0;
 354 }
 355
 356 static void
 357 release_transaction(struct client *client, struct client_resource *resource)
 358 {
 359         struct response *response =
 360                 container_of(resource, struct response, resource);
 361
 362         fw_cancel_transaction(client->device->card, &response->transaction);
 363 }
 364
 365 static void
 366 complete_transaction(struct fw_card *card, int rcode,
 367                      void *payload, size_t length, void *data)
 368 {
 369         struct response *response = data;
 370         struct client *client = response->client;
 371         unsigned long flags;
 372         struct fw_cdev_event_response *r = &response->response;
 373
 374         if (length < r->length)
 375                 r->length = length;
 376         if (rcode == RCODE_COMPLETE)
 377                 memcpy(r->data, payload, r->length);
 378
 379         spin_lock_irqsave(&client->lock, flags);
 380         list_del(&response->resource.link);
 381         spin_unlock_irqrestore(&client->lock, flags);
 382
 383         r->type   = FW_CDEV_EVENT_RESPONSE;
 384         r->rcode  = rcode;
 385
 386         /*
 387          * In the case that sizeof(*r) doesn't align with the position of the
 388          * data, and the read is short, preserve an extra copy of the data
 389          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 390          * for short reads and some apps depended on it, this is both safe
 391          * and prudent for compatibility.
 392          */
 393         if (r->length <= sizeof(*r) - offsetof(typeof(*r), data))
 394                 queue_event(client, &response->event, r, sizeof(*r),
 395                             r->data, r->length);
 396         else
 397                 queue_event(client, &response->event, r, sizeof(*r) + r->length,
 398                             NULL, 0);
 399 }
 400
 401 static int ioctl_send_request(struct client *client, void *buffer)
 402 {
 403         struct fw_device *device = client->device;
 404         struct fw_cdev_send_request *request = buffer;
 405         struct response *response;
 406
 407         /* What is the biggest size we'll accept, really? */
 408         if (request->length > 4096)
 409                 return -EINVAL;
 410
 411         response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
 412         if (response == NULL)
 413                 return -ENOMEM;
 414
 415         response->client = client;
 416         response->response.length = request->length;
 417         response->response.closure = request->closure;
 418
 419         if (request->data &&
 420             copy_from_user(response->response.data,
 421                            u64_to_uptr(request->data), request->length)) {
 422                 kfree(response);
 423                 return -EFAULT;
 424         }
 425
 426         response->resource.release = release_transaction;
 427         add_client_resource(client, &response->resource);
 428
 429         fw_send_request(device->card, &response->transaction,
 430                         request->tcode & 0x1f,
 431                         device->node->node_id,
 432                         request->generation,
 433                         device->max_speed,
 434                         request->offset,
 435                         response->response.data, request->length,
 436                         complete_transaction, response);
 437
 438         if (request->data)
 439                 return sizeof(request) + request->length;
 440         else
 441                 return sizeof(request);
 442 }
 443
 444 struct address_handler {
 445         struct fw_address_handler handler;
 446         __u64 closure;
 447         struct client *client;
 448         struct client_resource resource;
 449 };
 450
 451 struct request {
 452         struct fw_request *request;
 453         void *data;
 454         size_t length;
 455         struct client_resource resource;
 456 };
 457
 458 struct request_event {
 459         struct event event;
 460         struct fw_cdev_event_request request;
 461 };
 462
 463 static void
 464 release_request(struct client *client, struct client_resource *resource)
 465 {
 466         struct request *request =
 467                 container_of(resource, struct request, resource);
 468
 469         fw_send_response(client->device->card, request->request,
 470                          RCODE_CONFLICT_ERROR);
 471         kfree(request);
 472 }
 473
 474 static void
 475 handle_request(struct fw_card *card, struct fw_request *r,
 476                int tcode, int destination, int source,
 477                int generation, int speed,
 478                unsigned long long offset,
 479                void *payload, size_t length, void *callback_data)
 480 {
 481         struct address_handler *handler = callback_data;
 482         struct request *request;
 483         struct request_event *e;
 484         struct client *client = handler->client;
 485
 486         request = kmalloc(sizeof(*request), GFP_ATOMIC);
 487         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 488         if (request == NULL || e == NULL) {
 489                 kfree(request);
 490                 kfree(e);
 491                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
 492                 return;
 493         }
 494
 495         request->request = r;
 496         request->data    = payload;
 497         request->length  = length;
 498
 499         request->resource.release = release_request;
 500         add_client_resource(client, &request->resource);
 501
 502         e->request.type    = FW_CDEV_EVENT_REQUEST;
 503         e->request.tcode   = tcode;
 504         e->request.offset  = offset;
 505         e->request.length  = length;
 506         e->request.handle  = request->resource.handle;
 507         e->request.closure = handler->closure;
 508
 509         queue_event(client, &e->event,
 510                     &e->request, sizeof(e->request), payload, length);
 511 }
 512
 513 static void
 514 release_address_handler(struct client *client,
 515                         struct client_resource *resource)
 516 {
 517         struct address_handler *handler =
 518                 container_of(resource, struct address_handler, resource);
 519
 520         fw_core_remove_address_handler(&handler->handler);
 521         kfree(handler);
 522 }
 523
 524 static int ioctl_allocate(struct client *client, void *buffer)
 525 {
 526         struct fw_cdev_allocate *request = buffer;
 527         struct address_handler *handler;
 528         struct fw_address_region region;
 529
 530         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
 531         if (handler == NULL)
 532                 return -ENOMEM;
 533
 534         region.start = request->offset;
 535         region.end = request->offset + request->length;
 536         handler->handler.length = request->length;
 537         handler->handler.address_callback = handle_request;
 538         handler->handler.callback_data = handler;
 539         handler->closure = request->closure;
 540         handler->client = client;
 541
 542         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
 543                 kfree(handler);
 544                 return -EBUSY;
 545         }
 546
 547         handler->resource.release = release_address_handler;
 548         add_client_resource(client, &handler->resource);
 549         request->handle = handler->resource.handle;
 550
 551         return 0;
 552 }
 553
 554 static int ioctl_deallocate(struct client *client, void *buffer)
 555 {
 556         struct fw_cdev_deallocate *request = buffer;
 557
 558         return release_client_resource(client, request->handle, NULL);
 559 }
 560
 561 static int ioctl_send_response(struct client *client, void *buffer)
 562 {
 563         struct fw_cdev_send_response *request = buffer;
 564         struct client_resource *resource;
 565         struct request *r;
 566
 567         if (release_client_resource(client, request->handle, &resource) < 0)
 568                 return -EINVAL;
 569         r = container_of(resource, struct request, resource);
 570         if (request->length < r->length)
 571                 r->length = request->length;
 572         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 573                 return -EFAULT;
 574
 575         fw_send_response(client->device->card, r->request, request->rcode);
 576         kfree(r);
 577
 578         return 0;
 579 }
 580
 581 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 582 {
 583         struct fw_cdev_initiate_bus_reset *request = buffer;
 584         int short_reset;
 585
 586         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 587
 588         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 589 }
 590
 591 struct descriptor {
 592         struct fw_descriptor d;
 593         struct client_resource resource;
 594         u32 data[0];
 595 };
 596
 597 static void release_descriptor(struct client *client,
 598                                struct client_resource *resource)
 599 {
 600         struct descriptor *descriptor =
 601                 container_of(resource, struct descriptor, resource);
 602
 603         fw_core_remove_descriptor(&descriptor->d);
 604         kfree(descriptor);
 605 }
 606
 607 static int ioctl_add_descriptor(struct client *client, void *buffer)
 608 {
 609         struct fw_cdev_add_descriptor *request = buffer;
 610         struct descriptor *descriptor;
 611         int retval;
 612
 613         if (request->length > 256)
 614                 return -EINVAL;
 615
 616         descriptor =
 617                 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
 618         if (descriptor == NULL)
 619                 return -ENOMEM;
 620
 621         if (copy_from_user(descriptor->data,
 622                            u64_to_uptr(request->data), request->length * 4)) {
 623                 kfree(descriptor);
 624                 return -EFAULT;
 625         }
 626
 627         descriptor->d.length = request->length;
 628         descriptor->d.immediate = request->immediate;
 629         descriptor->d.key = request->key;
 630         descriptor->d.data = descriptor->data;
 631
 632         retval = fw_core_add_descriptor(&descriptor->d);
 633         if (retval < 0) {
 634                 kfree(descriptor);
 635                 return retval;
 636         }
 637
 638         descriptor->resource.release = release_descriptor;
 639         add_client_resource(client, &descriptor->resource);
 640         request->handle = descriptor->resource.handle;
 641
 642         return 0;
 643 }
 644
 645 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 646 {
 647         struct fw_cdev_remove_descriptor *request = buffer;
 648
 649         return release_client_resource(client, request->handle, NULL);
 650 }
 651
 652 static void
 653 iso_callback(struct fw_iso_context *context, u32 cycle,
 654              size_t header_length, void *header, void *data)
 655 {
 656         struct client *client = data;
 657         struct iso_interrupt *irq;
 658
 659         irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
 660         if (irq == NULL)
 661                 return;
 662
 663         irq->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 664         irq->interrupt.closure   = client->iso_closure;
 665         irq->interrupt.cycle     = cycle;
 666         irq->interrupt.header_length = header_length;
 667         memcpy(irq->interrupt.header, header, header_length);
 668         queue_event(client, &irq->event, &irq->interrupt,
 669                     sizeof(irq->interrupt) + header_length, NULL, 0);
 670 }
 671
 672 static int ioctl_create_iso_context(struct client *client, void *buffer)
 673 {
 674         struct fw_cdev_create_iso_context *request = buffer;
 675         struct fw_iso_context *context;
 676
 677         /* We only support one context at this time. */
 678         if (client->iso_context != NULL)
 679                 return -EBUSY;
 680
 681         if (request->channel > 63)
 682                 return -EINVAL;
 683
 684         switch (request->type) {
 685         case FW_ISO_CONTEXT_RECEIVE:
 686                 if (request->header_size < 4 || (request->header_size & 3))
 687                         return -EINVAL;
 688
 689                 break;
 690
 691         case FW_ISO_CONTEXT_TRANSMIT:
 692                 if (request->speed > SCODE_3200)
 693                         return -EINVAL;
 694
 695                 break;
 696
 697         default:
 698                 return -EINVAL;
 699         }
 700
 701         context =  fw_iso_context_create(client->device->card,
 702                                          request->type,
 703                                          request->channel,
 704                                          request->speed,
 705                                          request->header_size,
 706                                          iso_callback, client);
 707         if (IS_ERR(context))
 708                 return PTR_ERR(context);
 709
 710         client->iso_closure = request->closure;
 711         client->iso_context = context;
 712
 713         /* We only support one context at this time. */
 714         request->handle = 0;
 715
 716         return 0;
 717 }
 718
 719 /* Macros for decoding the iso packet control header. */
 720 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 721 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 722 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 723 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 724 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 725 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 726
 727 static int ioctl_queue_iso(struct client *client, void *buffer)
 728 {
 729         struct fw_cdev_queue_iso *request = buffer;
 730         struct fw_cdev_iso_packet __user *p, *end, *next;
 731         struct fw_iso_context *ctx = client->iso_context;
 732         unsigned long payload, buffer_end, header_length;
 733         u32 control;
 734         int count;
 735         struct {
 736                 struct fw_iso_packet packet;
 737                 u8 header[256];
 738         } u;
 739
 740         if (ctx == NULL || request->handle != 0)
 741                 return -EINVAL;
 742
 743         /*
 744          * If the user passes a non-NULL data pointer, has mmap()'ed
 745          * the iso buffer, and the pointer points inside the buffer,
 746          * we setup the payload pointers accordingly.  Otherwise we
 747          * set them both to 0, which will still let packets with
 748          * payload_length == 0 through.  In other words, if no packets
 749          * use the indirect payload, the iso buffer need not be mapped
 750          * and the request->data pointer is ignored.
 751          */
 752
 753         payload = (unsigned long)request->data - client->vm_start;
 754         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 755         if (request->data == 0 || client->buffer.pages == NULL ||
 756             payload >= buffer_end) {
 757                 payload = 0;
 758                 buffer_end = 0;
 759         }
 760
 761         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 762
 763         if (!access_ok(VERIFY_READ, p, request->size))
 764                 return -EFAULT;
 765
 766         end = (void __user *)p + request->size;
 767         count = 0;
 768         while (p < end) {
 769                 if (get_user(control, &p->control))
 770                         return -EFAULT;
 771                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 772                 u.packet.interrupt = GET_INTERRUPT(control);
 773                 u.packet.skip = GET_SKIP(control);
 774                 u.packet.tag = GET_TAG(control);
 775                 u.packet.sy = GET_SY(control);
 776                 u.packet.header_length = GET_HEADER_LENGTH(control);
 777
 778                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 779                         header_length = u.packet.header_length;
 780                 } else {
 781                         /*
 782                          * We require that header_length is a multiple of
 783                          * the fixed header size, ctx->header_size.
 784                          */
 785                         if (ctx->header_size == 0) {
 786                                 if (u.packet.header_length > 0)
 787                                         return -EINVAL;
 788                         } else if (u.packet.header_length % ctx->header_size != 0) {
 789                                 return -EINVAL;
 790                         }
 791                         header_length = 0;
 792                 }
 793
 794                 next = (struct fw_cdev_iso_packet __user *)
 795                         &p->header[header_length / 4];
 796                 if (next > end)
 797                         return -EINVAL;
 798                 if (__copy_from_user
 799                     (u.packet.header, p->header, header_length))
 800                         return -EFAULT;
 801                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 802                     u.packet.header_length + u.packet.payload_length > 0)
 803                         return -EINVAL;
 804                 if (payload + u.packet.payload_length > buffer_end)
 805                         return -EINVAL;
 806
 807                 if (fw_iso_context_queue(ctx, &u.packet,
 808                                          &client->buffer, payload))
 809                         break;
 810
 811                 p = next;
 812                 payload += u.packet.payload_length;
 813                 count++;
 814         }
 815
 816         request->size    -= uptr_to_u64(p) - request->packets;
 817         request->packets  = uptr_to_u64(p);
 818         request->data     = client->vm_start + payload;
 819
 820         return count;
 821 }
 822
 823 static int ioctl_start_iso(struct client *client, void *buffer)
 824 {
 825         struct fw_cdev_start_iso *request = buffer;
 826
 827         if (client->iso_context == NULL || request->handle != 0)
 828                 return -EINVAL;
 829
 830         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 831                 if (request->tags == 0 || request->tags > 15)
 832                         return -EINVAL;
 833
 834                 if (request->sync > 15)
 835                         return -EINVAL;
 836         }
 837
 838         return fw_iso_context_start(client->iso_context, request->cycle,
 839                                     request->sync, request->tags);
 840 }
 841
 842 static int ioctl_stop_iso(struct client *client, void *buffer)
 843 {
 844         struct fw_cdev_stop_iso *request = buffer;
 845
 846         if (client->iso_context == NULL || request->handle != 0)
 847                 return -EINVAL;
 848
 849         return fw_iso_context_stop(client->iso_context);
 850 }
 851
 852 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 853 {
 854         struct fw_cdev_get_cycle_timer *request = buffer;
 855         struct fw_card *card = client->device->card;
 856         unsigned long long bus_time;
 857         struct timeval tv;
 858         unsigned long flags;
 859
 860         preempt_disable();
 861         local_irq_save(flags);
 862
 863         bus_time = card->driver->get_bus_time(card);
 864         do_gettimeofday(&tv);
 865
 866         local_irq_restore(flags);
 867         preempt_enable();
 868
 869         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
 870         request->cycle_timer = bus_time & 0xffffffff;
 871         return 0;
 872 }
 873
 874 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
 875         ioctl_get_info,
 876         ioctl_send_request,
 877         ioctl_allocate,
 878         ioctl_deallocate,
 879         ioctl_send_response,
 880         ioctl_initiate_bus_reset,
 881         ioctl_add_descriptor,
 882         ioctl_remove_descriptor,
 883         ioctl_create_iso_context,
 884         ioctl_queue_iso,
 885         ioctl_start_iso,
 886         ioctl_stop_iso,
 887         ioctl_get_cycle_timer,
 888 };
 889
 890 static int
 891 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
 892 {
 893         char buffer[256];
 894         int retval;
 895
 896         if (_IOC_TYPE(cmd) != '#' ||
 897             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
 898                 return -EINVAL;
 899
 900         if (_IOC_DIR(cmd) & _IOC_WRITE) {
 901                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 902                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
 903                         return -EFAULT;
 904         }
 905
 906         retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
 907         if (retval < 0)
 908                 return retval;
 909
 910         if (_IOC_DIR(cmd) & _IOC_READ) {
 911                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 912                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
 913                         return -EFAULT;
 914         }
 915
 916         return retval;
 917 }
 918
 919 static long
 920 fw_device_op_ioctl(struct file *file,
 921                    unsigned int cmd, unsigned long arg)
 922 {
 923         struct client *client = file->private_data;
 924
 925         if (fw_device_is_shutdown(client->device))
 926                 return -ENODEV;
 927
 928         return dispatch_ioctl(client, cmd, (void __user *) arg);
 929 }
 930
 931 #ifdef CONFIG_COMPAT
 932 static long
 933 fw_device_op_compat_ioctl(struct file *file,
 934                           unsigned int cmd, unsigned long arg)
 935 {
 936         struct client *client = file->private_data;
 937
 938         if (fw_device_is_shutdown(client->device))
 939                 return -ENODEV;
 940
 941         return dispatch_ioctl(client, cmd, compat_ptr(arg));
 942 }
 943 #endif
 944
 945 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 946 {
 947         struct client *client = file->private_data;
 948         enum dma_data_direction direction;
 949         unsigned long size;
 950         int page_count, retval;
 951
 952         if (fw_device_is_shutdown(client->device))
 953                 return -ENODEV;
 954
 955         /* FIXME: We could support multiple buffers, but we don't. */
 956         if (client->buffer.pages != NULL)
 957                 return -EBUSY;
 958
 959         if (!(vma->vm_flags & VM_SHARED))
 960                 return -EINVAL;
 961
 962         if (vma->vm_start & ~PAGE_MASK)
 963                 return -EINVAL;
 964
 965         client->vm_start = vma->vm_start;
 966         size = vma->vm_end - vma->vm_start;
 967         page_count = size >> PAGE_SHIFT;
 968         if (size & ~PAGE_MASK)
 969                 return -EINVAL;
 970
 971         if (vma->vm_flags & VM_WRITE)
 972                 direction = DMA_TO_DEVICE;
 973         else
 974                 direction = DMA_FROM_DEVICE;
 975
 976         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
 977                                     page_count, direction);
 978         if (retval < 0)
 979                 return retval;
 980
 981         retval = fw_iso_buffer_map(&client->buffer, vma);
 982         if (retval < 0)
 983                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 984
 985         return retval;
 986 }
 987
 988 static int fw_device_op_release(struct inode *inode, struct file *file)
 989 {
 990         struct client *client = file->private_data;
 991         struct event *e, *next_e;
 992         struct client_resource *r, *next_r;
 993         unsigned long flags;
 994
 995         if (client->buffer.pages)
 996                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 997
 998         if (client->iso_context)
 999                 fw_iso_context_destroy(client->iso_context);
1000
1001         list_for_each_entry_safe(r, next_r, &client->resource_list, link)
1002                 r->release(client, r);
1003
1004         /*
1005          * FIXME: We should wait for the async tasklets to stop
1006          * running before freeing the memory.
1007          */
1008
1009         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1010                 kfree(e);
1011
1012         spin_lock_irqsave(&client->device->card->lock, flags);
1013         list_del(&client->link);
1014         spin_unlock_irqrestore(&client->device->card->lock, flags);
1015
1016         fw_device_put(client->device);
1017         kfree(client);
1018
1019         return 0;
1020 }
1021
1022 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1023 {
1024         struct client *client = file->private_data;
1025         unsigned int mask = 0;
1026
1027         poll_wait(file, &client->wait, pt);
1028
1029         if (fw_device_is_shutdown(client->device))
1030                 mask |= POLLHUP | POLLERR;
1031         if (!list_empty(&client->event_list))
1032                 mask |= POLLIN | POLLRDNORM;
1033
1034         return mask;
1035 }
1036
1037 const struct file_operations fw_device_ops = {
1038         .owner          = THIS_MODULE,
1039         .open           = fw_device_op_open,
1040         .read           = fw_device_op_read,
1041         .unlocked_ioctl = fw_device_op_ioctl,
1042         .poll           = fw_device_op_poll,
1043         .release        = fw_device_op_release,
1044         .mmap           = fw_device_op_mmap,
1045
1046 #ifdef CONFIG_COMPAT
1047         .compat_ioctl   = fw_device_op_compat_ioctl,
1048 #endif
1049 };