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_from_devt(inode->i_rdev);
 113         if (device == NULL)
 114                 return -ENODEV;
 115
 116         client = kzalloc(sizeof(*client), GFP_KERNEL);
 117         if (client == NULL)
 118                 return -ENOMEM;
 119
 120         client->device = fw_device_get(device);
 121         INIT_LIST_HEAD(&client->event_list);
 122         INIT_LIST_HEAD(&client->resource_list);
 123         spin_lock_init(&client->lock);
 124         init_waitqueue_head(&client->wait);
 125
 126         file->private_data = client;
 127
 128         spin_lock_irqsave(&device->card->lock, flags);
 129         list_add_tail(&client->link, &device->client_list);
 130         spin_unlock_irqrestore(&device->card->lock, flags);
 131
 132         return 0;
 133 }
 134
 135 static void queue_event(struct client *client, struct event *event,
 136                         void *data0, size_t size0, void *data1, size_t size1)
 137 {
 138         unsigned long flags;
 139
 140         event->v[0].data = data0;
 141         event->v[0].size = size0;
 142         event->v[1].data = data1;
 143         event->v[1].size = size1;
 144
 145         spin_lock_irqsave(&client->lock, flags);
 146         list_add_tail(&event->link, &client->event_list);
 147         spin_unlock_irqrestore(&client->lock, flags);
 148
 149         wake_up_interruptible(&client->wait);
 150 }
 151
 152 static int
 153 dequeue_event(struct client *client, char __user *buffer, size_t count)
 154 {
 155         unsigned long flags;
 156         struct event *event;
 157         size_t size, total;
 158         int i, retval;
 159
 160         retval = wait_event_interruptible(client->wait,
 161                                           !list_empty(&client->event_list) ||
 162                                           fw_device_is_shutdown(client->device));
 163         if (retval < 0)
 164                 return retval;
 165
 166         if (list_empty(&client->event_list) &&
 167                        fw_device_is_shutdown(client->device))
 168                 return -ENODEV;
 169
 170         spin_lock_irqsave(&client->lock, flags);
 171         event = container_of(client->event_list.next, struct event, link);
 172         list_del(&event->link);
 173         spin_unlock_irqrestore(&client->lock, flags);
 174
 175         total = 0;
 176         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 177                 size = min(event->v[i].size, count - total);
 178                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 179                         retval = -EFAULT;
 180                         goto out;
 181                 }
 182                 total += size;
 183         }
 184         retval = total;
 185
 186  out:
 187         kfree(event);
 188
 189         return retval;
 190 }
 191
 192 static ssize_t
 193 fw_device_op_read(struct file *file,
 194                   char __user *buffer, size_t count, loff_t *offset)
 195 {
 196         struct client *client = file->private_data;
 197
 198         return dequeue_event(client, buffer, count);
 199 }
 200
 201 static void
 202 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 203                      struct client *client)
 204 {
 205         struct fw_card *card = client->device->card;
 206
 207         event->closure       = client->bus_reset_closure;
 208         event->type          = FW_CDEV_EVENT_BUS_RESET;
 209         event->node_id       = client->device->node_id;
 210         event->local_node_id = card->local_node->node_id;
 211         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 212         event->irm_node_id   = card->irm_node->node_id;
 213         event->root_node_id  = card->root_node->node_id;
 214         event->generation    = card->generation;
 215 }
 216
 217 static void
 218 for_each_client(struct fw_device *device,
 219                 void (*callback)(struct client *client))
 220 {
 221         struct fw_card *card = device->card;
 222         struct client *c;
 223         unsigned long flags;
 224
 225         spin_lock_irqsave(&card->lock, flags);
 226
 227         list_for_each_entry(c, &device->client_list, link)
 228                 callback(c);
 229
 230         spin_unlock_irqrestore(&card->lock, flags);
 231 }
 232
 233 static void
 234 queue_bus_reset_event(struct client *client)
 235 {
 236         struct bus_reset *bus_reset;
 237
 238         bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
 239         if (bus_reset == NULL) {
 240                 fw_notify("Out of memory when allocating bus reset event\n");
 241                 return;
 242         }
 243
 244         fill_bus_reset_event(&bus_reset->reset, client);
 245
 246         queue_event(client, &bus_reset->event,
 247                     &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
 248 }
 249
 250 void fw_device_cdev_update(struct fw_device *device)
 251 {
 252         for_each_client(device, queue_bus_reset_event);
 253 }
 254
 255 static void wake_up_client(struct client *client)
 256 {
 257         wake_up_interruptible(&client->wait);
 258 }
 259
 260 void fw_device_cdev_remove(struct fw_device *device)
 261 {
 262         for_each_client(device, wake_up_client);
 263 }
 264
 265 static int ioctl_get_info(struct client *client, void *buffer)
 266 {
 267         struct fw_cdev_get_info *get_info = buffer;
 268         struct fw_cdev_event_bus_reset bus_reset;
 269
 270         client->version = get_info->version;
 271         get_info->version = FW_CDEV_VERSION;
 272
 273         if (get_info->rom != 0) {
 274                 void __user *uptr = u64_to_uptr(get_info->rom);
 275                 size_t want = get_info->rom_length;
 276                 size_t have = client->device->config_rom_length * 4;
 277
 278                 if (copy_to_user(uptr, client->device->config_rom,
 279                                  min(want, have)))
 280                         return -EFAULT;
 281         }
 282         get_info->rom_length = client->device->config_rom_length * 4;
 283
 284         client->bus_reset_closure = get_info->bus_reset_closure;
 285         if (get_info->bus_reset != 0) {
 286                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 287
 288                 fill_bus_reset_event(&bus_reset, client);
 289                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 290                         return -EFAULT;
 291         }
 292
 293         get_info->card = client->device->card->index;
 294
 295         return 0;
 296 }
 297
 298 static void
 299 add_client_resource(struct client *client, struct client_resource *resource)
 300 {
 301         unsigned long flags;
 302
 303         spin_lock_irqsave(&client->lock, flags);
 304         list_add_tail(&resource->link, &client->resource_list);
 305         resource->handle = client->resource_handle++;
 306         spin_unlock_irqrestore(&client->lock, flags);
 307 }
 308
 309 static int
 310 release_client_resource(struct client *client, u32 handle,
 311                         struct client_resource **resource)
 312 {
 313         struct client_resource *r;
 314         unsigned long flags;
 315
 316         spin_lock_irqsave(&client->lock, flags);
 317         list_for_each_entry(r, &client->resource_list, link) {
 318                 if (r->handle == handle) {
 319                         list_del(&r->link);
 320                         break;
 321                 }
 322         }
 323         spin_unlock_irqrestore(&client->lock, flags);
 324
 325         if (&r->link == &client->resource_list)
 326                 return -EINVAL;
 327
 328         if (resource)
 329                 *resource = r;
 330         else
 331                 r->release(client, r);
 332
 333         return 0;
 334 }
 335
 336 static void
 337 release_transaction(struct client *client, struct client_resource *resource)
 338 {
 339         struct response *response =
 340                 container_of(resource, struct response, resource);
 341
 342         fw_cancel_transaction(client->device->card, &response->transaction);
 343 }
 344
 345 static void
 346 complete_transaction(struct fw_card *card, int rcode,
 347                      void *payload, size_t length, void *data)
 348 {
 349         struct response *response = data;
 350         struct client *client = response->client;
 351         unsigned long flags;
 352
 353         if (length < response->response.length)
 354                 response->response.length = length;
 355         if (rcode == RCODE_COMPLETE)
 356                 memcpy(response->response.data, payload,
 357                        response->response.length);
 358
 359         spin_lock_irqsave(&client->lock, flags);
 360         list_del(&response->resource.link);
 361         spin_unlock_irqrestore(&client->lock, flags);
 362
 363         response->response.type   = FW_CDEV_EVENT_RESPONSE;
 364         response->response.rcode  = rcode;
 365         queue_event(client, &response->event,
 366                     &response->response, sizeof(response->response),
 367                     response->response.data, response->response.length);
 368 }
 369
 370 static int ioctl_send_request(struct client *client, void *buffer)
 371 {
 372         struct fw_device *device = client->device;
 373         struct fw_cdev_send_request *request = buffer;
 374         struct response *response;
 375
 376         /* What is the biggest size we'll accept, really? */
 377         if (request->length > 4096)
 378                 return -EINVAL;
 379
 380         response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
 381         if (response == NULL)
 382                 return -ENOMEM;
 383
 384         response->client = client;
 385         response->response.length = request->length;
 386         response->response.closure = request->closure;
 387
 388         if (request->data &&
 389             copy_from_user(response->response.data,
 390                            u64_to_uptr(request->data), request->length)) {
 391                 kfree(response);
 392                 return -EFAULT;
 393         }
 394
 395         response->resource.release = release_transaction;
 396         add_client_resource(client, &response->resource);
 397
 398         fw_send_request(device->card, &response->transaction,
 399                         request->tcode & 0x1f,
 400                         device->node->node_id,
 401                         request->generation,
 402                         device->max_speed,
 403                         request->offset,
 404                         response->response.data, request->length,
 405                         complete_transaction, response);
 406
 407         if (request->data)
 408                 return sizeof(request) + request->length;
 409         else
 410                 return sizeof(request);
 411 }
 412
 413 struct address_handler {
 414         struct fw_address_handler handler;
 415         __u64 closure;
 416         struct client *client;
 417         struct client_resource resource;
 418 };
 419
 420 struct request {
 421         struct fw_request *request;
 422         void *data;
 423         size_t length;
 424         struct client_resource resource;
 425 };
 426
 427 struct request_event {
 428         struct event event;
 429         struct fw_cdev_event_request request;
 430 };
 431
 432 static void
 433 release_request(struct client *client, struct client_resource *resource)
 434 {
 435         struct request *request =
 436                 container_of(resource, struct request, resource);
 437
 438         fw_send_response(client->device->card, request->request,
 439                          RCODE_CONFLICT_ERROR);
 440         kfree(request);
 441 }
 442
 443 static void
 444 handle_request(struct fw_card *card, struct fw_request *r,
 445                int tcode, int destination, int source,
 446                int generation, int speed,
 447                unsigned long long offset,
 448                void *payload, size_t length, void *callback_data)
 449 {
 450         struct address_handler *handler = callback_data;
 451         struct request *request;
 452         struct request_event *e;
 453         struct client *client = handler->client;
 454
 455         request = kmalloc(sizeof(*request), GFP_ATOMIC);
 456         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 457         if (request == NULL || e == NULL) {
 458                 kfree(request);
 459                 kfree(e);
 460                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
 461                 return;
 462         }
 463
 464         request->request = r;
 465         request->data    = payload;
 466         request->length  = length;
 467
 468         request->resource.release = release_request;
 469         add_client_resource(client, &request->resource);
 470
 471         e->request.type    = FW_CDEV_EVENT_REQUEST;
 472         e->request.tcode   = tcode;
 473         e->request.offset  = offset;
 474         e->request.length  = length;
 475         e->request.handle  = request->resource.handle;
 476         e->request.closure = handler->closure;
 477
 478         queue_event(client, &e->event,
 479                     &e->request, sizeof(e->request), payload, length);
 480 }
 481
 482 static void
 483 release_address_handler(struct client *client,
 484                         struct client_resource *resource)
 485 {
 486         struct address_handler *handler =
 487                 container_of(resource, struct address_handler, resource);
 488
 489         fw_core_remove_address_handler(&handler->handler);
 490         kfree(handler);
 491 }
 492
 493 static int ioctl_allocate(struct client *client, void *buffer)
 494 {
 495         struct fw_cdev_allocate *request = buffer;
 496         struct address_handler *handler;
 497         struct fw_address_region region;
 498
 499         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
 500         if (handler == NULL)
 501                 return -ENOMEM;
 502
 503         region.start = request->offset;
 504         region.end = request->offset + request->length;
 505         handler->handler.length = request->length;
 506         handler->handler.address_callback = handle_request;
 507         handler->handler.callback_data = handler;
 508         handler->closure = request->closure;
 509         handler->client = client;
 510
 511         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
 512                 kfree(handler);
 513                 return -EBUSY;
 514         }
 515
 516         handler->resource.release = release_address_handler;
 517         add_client_resource(client, &handler->resource);
 518         request->handle = handler->resource.handle;
 519
 520         return 0;
 521 }
 522
 523 static int ioctl_deallocate(struct client *client, void *buffer)
 524 {
 525         struct fw_cdev_deallocate *request = buffer;
 526
 527         return release_client_resource(client, request->handle, NULL);
 528 }
 529
 530 static int ioctl_send_response(struct client *client, void *buffer)
 531 {
 532         struct fw_cdev_send_response *request = buffer;
 533         struct client_resource *resource;
 534         struct request *r;
 535
 536         if (release_client_resource(client, request->handle, &resource) < 0)
 537                 return -EINVAL;
 538         r = container_of(resource, struct request, resource);
 539         if (request->length < r->length)
 540                 r->length = request->length;
 541         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 542                 return -EFAULT;
 543
 544         fw_send_response(client->device->card, r->request, request->rcode);
 545         kfree(r);
 546
 547         return 0;
 548 }
 549
 550 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 551 {
 552         struct fw_cdev_initiate_bus_reset *request = buffer;
 553         int short_reset;
 554
 555         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 556
 557         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 558 }
 559
 560 struct descriptor {
 561         struct fw_descriptor d;
 562         struct client_resource resource;
 563         u32 data[0];
 564 };
 565
 566 static void release_descriptor(struct client *client,
 567                                struct client_resource *resource)
 568 {
 569         struct descriptor *descriptor =
 570                 container_of(resource, struct descriptor, resource);
 571
 572         fw_core_remove_descriptor(&descriptor->d);
 573         kfree(descriptor);
 574 }
 575
 576 static int ioctl_add_descriptor(struct client *client, void *buffer)
 577 {
 578         struct fw_cdev_add_descriptor *request = buffer;
 579         struct descriptor *descriptor;
 580         int retval;
 581
 582         if (request->length > 256)
 583                 return -EINVAL;
 584
 585         descriptor =
 586                 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
 587         if (descriptor == NULL)
 588                 return -ENOMEM;
 589
 590         if (copy_from_user(descriptor->data,
 591                            u64_to_uptr(request->data), request->length * 4)) {
 592                 kfree(descriptor);
 593                 return -EFAULT;
 594         }
 595
 596         descriptor->d.length = request->length;
 597         descriptor->d.immediate = request->immediate;
 598         descriptor->d.key = request->key;
 599         descriptor->d.data = descriptor->data;
 600
 601         retval = fw_core_add_descriptor(&descriptor->d);
 602         if (retval < 0) {
 603                 kfree(descriptor);
 604                 return retval;
 605         }
 606
 607         descriptor->resource.release = release_descriptor;
 608         add_client_resource(client, &descriptor->resource);
 609         request->handle = descriptor->resource.handle;
 610
 611         return 0;
 612 }
 613
 614 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 615 {
 616         struct fw_cdev_remove_descriptor *request = buffer;
 617
 618         return release_client_resource(client, request->handle, NULL);
 619 }
 620
 621 static void
 622 iso_callback(struct fw_iso_context *context, u32 cycle,
 623              size_t header_length, void *header, void *data)
 624 {
 625         struct client *client = data;
 626         struct iso_interrupt *irq;
 627
 628         irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
 629         if (irq == NULL)
 630                 return;
 631
 632         irq->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 633         irq->interrupt.closure   = client->iso_closure;
 634         irq->interrupt.cycle     = cycle;
 635         irq->interrupt.header_length = header_length;
 636         memcpy(irq->interrupt.header, header, header_length);
 637         queue_event(client, &irq->event, &irq->interrupt,
 638                     sizeof(irq->interrupt) + header_length, NULL, 0);
 639 }
 640
 641 static int ioctl_create_iso_context(struct client *client, void *buffer)
 642 {
 643         struct fw_cdev_create_iso_context *request = buffer;
 644         struct fw_iso_context *context;
 645
 646         if (request->channel > 63)
 647                 return -EINVAL;
 648
 649         switch (request->type) {
 650         case FW_ISO_CONTEXT_RECEIVE:
 651                 if (request->header_size < 4 || (request->header_size & 3))
 652                         return -EINVAL;
 653
 654                 break;
 655
 656         case FW_ISO_CONTEXT_TRANSMIT:
 657                 if (request->speed > SCODE_3200)
 658                         return -EINVAL;
 659
 660                 break;
 661
 662         default:
 663                 return -EINVAL;
 664         }
 665
 666         context =  fw_iso_context_create(client->device->card,
 667                                          request->type,
 668                                          request->channel,
 669                                          request->speed,
 670                                          request->header_size,
 671                                          iso_callback, client);
 672         if (IS_ERR(context))
 673                 return PTR_ERR(context);
 674
 675         client->iso_closure = request->closure;
 676         client->iso_context = context;
 677
 678         /* We only support one context at this time. */
 679         request->handle = 0;
 680
 681         return 0;
 682 }
 683
 684 /* Macros for decoding the iso packet control header. */
 685 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 686 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 687 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 688 #define GET_TAG(v)              (((v) >> 18) & 0x02)
 689 #define GET_SY(v)               (((v) >> 20) & 0x04)
 690 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 691
 692 static int ioctl_queue_iso(struct client *client, void *buffer)
 693 {
 694         struct fw_cdev_queue_iso *request = buffer;
 695         struct fw_cdev_iso_packet __user *p, *end, *next;
 696         struct fw_iso_context *ctx = client->iso_context;
 697         unsigned long payload, buffer_end, header_length;
 698         u32 control;
 699         int count;
 700         struct {
 701                 struct fw_iso_packet packet;
 702                 u8 header[256];
 703         } u;
 704
 705         if (ctx == NULL || request->handle != 0)
 706                 return -EINVAL;
 707
 708         /*
 709          * If the user passes a non-NULL data pointer, has mmap()'ed
 710          * the iso buffer, and the pointer points inside the buffer,
 711          * we setup the payload pointers accordingly.  Otherwise we
 712          * set them both to 0, which will still let packets with
 713          * payload_length == 0 through.  In other words, if no packets
 714          * use the indirect payload, the iso buffer need not be mapped
 715          * and the request->data pointer is ignored.
 716          */
 717
 718         payload = (unsigned long)request->data - client->vm_start;
 719         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 720         if (request->data == 0 || client->buffer.pages == NULL ||
 721             payload >= buffer_end) {
 722                 payload = 0;
 723                 buffer_end = 0;
 724         }
 725
 726         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 727
 728         if (!access_ok(VERIFY_READ, p, request->size))
 729                 return -EFAULT;
 730
 731         end = (void __user *)p + request->size;
 732         count = 0;
 733         while (p < end) {
 734                 if (get_user(control, &p->control))
 735                         return -EFAULT;
 736                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 737                 u.packet.interrupt = GET_INTERRUPT(control);
 738                 u.packet.skip = GET_SKIP(control);
 739                 u.packet.tag = GET_TAG(control);
 740                 u.packet.sy = GET_SY(control);
 741                 u.packet.header_length = GET_HEADER_LENGTH(control);
 742
 743                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 744                         header_length = u.packet.header_length;
 745                 } else {
 746                         /*
 747                          * We require that header_length is a multiple of
 748                          * the fixed header size, ctx->header_size.
 749                          */
 750                         if (ctx->header_size == 0) {
 751                                 if (u.packet.header_length > 0)
 752                                         return -EINVAL;
 753                         } else if (u.packet.header_length % ctx->header_size != 0) {
 754                                 return -EINVAL;
 755                         }
 756                         header_length = 0;
 757                 }
 758
 759                 next = (struct fw_cdev_iso_packet __user *)
 760                         &p->header[header_length / 4];
 761                 if (next > end)
 762                         return -EINVAL;
 763                 if (__copy_from_user
 764                     (u.packet.header, p->header, header_length))
 765                         return -EFAULT;
 766                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 767                     u.packet.header_length + u.packet.payload_length > 0)
 768                         return -EINVAL;
 769                 if (payload + u.packet.payload_length > buffer_end)
 770                         return -EINVAL;
 771
 772                 if (fw_iso_context_queue(ctx, &u.packet,
 773                                          &client->buffer, payload))
 774                         break;
 775
 776                 p = next;
 777                 payload += u.packet.payload_length;
 778                 count++;
 779         }
 780
 781         request->size    -= uptr_to_u64(p) - request->packets;
 782         request->packets  = uptr_to_u64(p);
 783         request->data     = client->vm_start + payload;
 784
 785         return count;
 786 }
 787
 788 static int ioctl_start_iso(struct client *client, void *buffer)
 789 {
 790         struct fw_cdev_start_iso *request = buffer;
 791
 792         if (request->handle != 0)
 793                 return -EINVAL;
 794         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 795                 if (request->tags == 0 || request->tags > 15)
 796                         return -EINVAL;
 797
 798                 if (request->sync > 15)
 799                         return -EINVAL;
 800         }
 801
 802         return fw_iso_context_start(client->iso_context, request->cycle,
 803                                     request->sync, request->tags);
 804 }
 805
 806 static int ioctl_stop_iso(struct client *client, void *buffer)
 807 {
 808         struct fw_cdev_stop_iso *request = buffer;
 809
 810         if (request->handle != 0)
 811                 return -EINVAL;
 812
 813         return fw_iso_context_stop(client->iso_context);
 814 }
 815
 816 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 817 {
 818         struct fw_cdev_get_cycle_timer *request = buffer;
 819         struct fw_card *card = client->device->card;
 820         unsigned long long bus_time;
 821         struct timeval tv;
 822         unsigned long flags;
 823
 824         preempt_disable();
 825         local_irq_save(flags);
 826
 827         bus_time = card->driver->get_bus_time(card);
 828         do_gettimeofday(&tv);
 829
 830         local_irq_restore(flags);
 831         preempt_enable();
 832
 833         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
 834         request->cycle_timer = bus_time & 0xffffffff;
 835         return 0;
 836 }
 837
 838 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
 839         ioctl_get_info,
 840         ioctl_send_request,
 841         ioctl_allocate,
 842         ioctl_deallocate,
 843         ioctl_send_response,
 844         ioctl_initiate_bus_reset,
 845         ioctl_add_descriptor,
 846         ioctl_remove_descriptor,
 847         ioctl_create_iso_context,
 848         ioctl_queue_iso,
 849         ioctl_start_iso,
 850         ioctl_stop_iso,
 851         ioctl_get_cycle_timer,
 852 };
 853
 854 static int
 855 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
 856 {
 857         char buffer[256];
 858         int retval;
 859
 860         if (_IOC_TYPE(cmd) != '#' ||
 861             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
 862                 return -EINVAL;
 863
 864         if (_IOC_DIR(cmd) & _IOC_WRITE) {
 865                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 866                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
 867                         return -EFAULT;
 868         }
 869
 870         retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
 871         if (retval < 0)
 872                 return retval;
 873
 874         if (_IOC_DIR(cmd) & _IOC_READ) {
 875                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 876                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
 877                         return -EFAULT;
 878         }
 879
 880         return 0;
 881 }
 882
 883 static long
 884 fw_device_op_ioctl(struct file *file,
 885                    unsigned int cmd, unsigned long arg)
 886 {
 887         struct client *client = file->private_data;
 888
 889         return dispatch_ioctl(client, cmd, (void __user *) arg);
 890 }
 891
 892 #ifdef CONFIG_COMPAT
 893 static long
 894 fw_device_op_compat_ioctl(struct file *file,
 895                           unsigned int cmd, unsigned long arg)
 896 {
 897         struct client *client = file->private_data;
 898
 899         return dispatch_ioctl(client, cmd, compat_ptr(arg));
 900 }
 901 #endif
 902
 903 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 904 {
 905         struct client *client = file->private_data;
 906         enum dma_data_direction direction;
 907         unsigned long size;
 908         int page_count, retval;
 909
 910         /* FIXME: We could support multiple buffers, but we don't. */
 911         if (client->buffer.pages != NULL)
 912                 return -EBUSY;
 913
 914         if (!(vma->vm_flags & VM_SHARED))
 915                 return -EINVAL;
 916
 917         if (vma->vm_start & ~PAGE_MASK)
 918                 return -EINVAL;
 919
 920         client->vm_start = vma->vm_start;
 921         size = vma->vm_end - vma->vm_start;
 922         page_count = size >> PAGE_SHIFT;
 923         if (size & ~PAGE_MASK)
 924                 return -EINVAL;
 925
 926         if (vma->vm_flags & VM_WRITE)
 927                 direction = DMA_TO_DEVICE;
 928         else
 929                 direction = DMA_FROM_DEVICE;
 930
 931         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
 932                                     page_count, direction);
 933         if (retval < 0)
 934                 return retval;
 935
 936         retval = fw_iso_buffer_map(&client->buffer, vma);
 937         if (retval < 0)
 938                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 939
 940         return retval;
 941 }
 942
 943 static int fw_device_op_release(struct inode *inode, struct file *file)
 944 {
 945         struct client *client = file->private_data;
 946         struct event *e, *next_e;
 947         struct client_resource *r, *next_r;
 948         unsigned long flags;
 949
 950         if (client->buffer.pages)
 951                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 952
 953         if (client->iso_context)
 954                 fw_iso_context_destroy(client->iso_context);
 955
 956         list_for_each_entry_safe(r, next_r, &client->resource_list, link)
 957                 r->release(client, r);
 958
 959         /*
 960          * FIXME: We should wait for the async tasklets to stop
 961          * running before freeing the memory.
 962          */
 963
 964         list_for_each_entry_safe(e, next_e, &client->event_list, link)
 965                 kfree(e);
 966
 967         spin_lock_irqsave(&client->device->card->lock, flags);
 968         list_del(&client->link);
 969         spin_unlock_irqrestore(&client->device->card->lock, flags);
 970
 971         fw_device_put(client->device);
 972         kfree(client);
 973
 974         return 0;
 975 }
 976
 977 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
 978 {
 979         struct client *client = file->private_data;
 980         unsigned int mask = 0;
 981
 982         poll_wait(file, &client->wait, pt);
 983
 984         if (fw_device_is_shutdown(client->device))
 985                 mask |= POLLHUP | POLLERR;
 986         if (!list_empty(&client->event_list))
 987                 mask |= POLLIN | POLLRDNORM;
 988
 989         return mask;
 990 }
 991
 992 const struct file_operations fw_device_ops = {
 993         .owner          = THIS_MODULE,
 994         .open           = fw_device_op_open,
 995         .read           = fw_device_op_read,
 996         .unlocked_ioctl = fw_device_op_ioctl,
 997         .poll           = fw_device_op_poll,
 998         .release        = fw_device_op_release,
 999         .mmap           = fw_device_op_mmap,
1000
1001 #ifdef CONFIG_COMPAT
1002         .compat_ioctl   = fw_device_op_compat_ioctl,
1003 #endif
1004 };