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