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/delay.h>
  29 #include <linux/mm.h>
  30 #include <linux/idr.h>
  31 #include <linux/compat.h>
  32 #include <linux/firewire-cdev.h>
  33 #include <asm/uaccess.h>
  34 #include "fw-transaction.h"
  35 #include "fw-topology.h"
  36 #include "fw-device.h"
  37
  38 struct client;
  39 struct client_resource {
  40         struct list_head link;
  41         void (*release)(struct client *client, struct client_resource *r);
  42         u32 handle;
  43 };
  44
  45 /*
  46  * dequeue_event() just kfree()'s the event, so the event has to be
  47  * the first field in the struct.
  48  */
  49
  50 struct event {
  51         struct { void *data; size_t size; } v[2];
  52         struct list_head link;
  53 };
  54
  55 struct bus_reset {
  56         struct event event;
  57         struct fw_cdev_event_bus_reset reset;
  58 };
  59
  60 struct response {
  61         struct event event;
  62         struct fw_transaction transaction;
  63         struct client *client;
  64         struct client_resource resource;
  65         struct fw_cdev_event_response response;
  66 };
  67
  68 struct iso_interrupt {
  69         struct event event;
  70         struct fw_cdev_event_iso_interrupt interrupt;
  71 };
  72
  73 struct client {
  74         u32 version;
  75         struct fw_device *device;
  76         spinlock_t lock;
  77         u32 resource_handle;
  78         struct list_head resource_list;
  79         struct list_head event_list;
  80         wait_queue_head_t wait;
  81         u64 bus_reset_closure;
  82
  83         struct fw_iso_context *iso_context;
  84         u64 iso_closure;
  85         struct fw_iso_buffer buffer;
  86         unsigned long vm_start;
  87
  88         struct list_head link;
  89 };
  90
  91 static inline void __user *
  92 u64_to_uptr(__u64 value)
  93 {
  94         return (void __user *)(unsigned long)value;
  95 }
  96
  97 static inline __u64
  98 uptr_to_u64(void __user *ptr)
  99 {
 100         return (__u64)(unsigned long)ptr;
 101 }
 102
 103 static int fw_device_op_open(struct inode *inode, struct file *file)
 104 {
 105         struct fw_device *device;
 106         struct client *client;
 107         unsigned long flags;
 108
 109         device = fw_device_from_devt(inode->i_rdev);
 110         if (device == NULL)
 111                 return -ENODEV;
 112
 113         client = kzalloc(sizeof(*client), GFP_KERNEL);
 114         if (client == NULL)
 115                 return -ENOMEM;
 116
 117         client->device = fw_device_get(device);
 118         INIT_LIST_HEAD(&client->event_list);
 119         INIT_LIST_HEAD(&client->resource_list);
 120         spin_lock_init(&client->lock);
 121         init_waitqueue_head(&client->wait);
 122
 123         file->private_data = client;
 124
 125         spin_lock_irqsave(&device->card->lock, flags);
 126         list_add_tail(&client->link, &device->client_list);
 127         spin_unlock_irqrestore(&device->card->lock, flags);
 128
 129         return 0;
 130 }
 131
 132 static void queue_event(struct client *client, struct event *event,
 133                         void *data0, size_t size0, void *data1, size_t size1)
 134 {
 135         unsigned long flags;
 136
 137         event->v[0].data = data0;
 138         event->v[0].size = size0;
 139         event->v[1].data = data1;
 140         event->v[1].size = size1;
 141
 142         spin_lock_irqsave(&client->lock, flags);
 143
 144         list_add_tail(&event->link, &client->event_list);
 145         wake_up_interruptible(&client->wait);
 146
 147         spin_unlock_irqrestore(&client->lock, flags);
 148 }
 149
 150 static int
 151 dequeue_event(struct client *client, char __user *buffer, size_t count)
 152 {
 153         unsigned long flags;
 154         struct event *event;
 155         size_t size, total;
 156         int i, retval;
 157
 158         retval = wait_event_interruptible(client->wait,
 159                                           !list_empty(&client->event_list) ||
 160                                           fw_device_is_shutdown(client->device));
 161         if (retval < 0)
 162                 return retval;
 163
 164         if (list_empty(&client->event_list) &&
 165                        fw_device_is_shutdown(client->device))
 166                 return -ENODEV;
 167
 168         spin_lock_irqsave(&client->lock, flags);
 169         event = container_of(client->event_list.next, struct event, link);
 170         list_del(&event->link);
 171         spin_unlock_irqrestore(&client->lock, flags);
 172
 173         total = 0;
 174         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 175                 size = min(event->v[i].size, count - total);
 176                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 177                         retval = -EFAULT;
 178                         goto out;
 179                 }
 180                 total += size;
 181         }
 182         retval = total;
 183
 184  out:
 185         kfree(event);
 186
 187         return retval;
 188 }
 189
 190 static ssize_t
 191 fw_device_op_read(struct file *file,
 192                   char __user *buffer, size_t count, loff_t *offset)
 193 {
 194         struct client *client = file->private_data;
 195
 196         return dequeue_event(client, buffer, count);
 197 }
 198
 199 static void
 200 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 201                      struct client *client)
 202 {
 203         struct fw_card *card = client->device->card;
 204
 205         event->closure       = client->bus_reset_closure;
 206         event->type          = FW_CDEV_EVENT_BUS_RESET;
 207         event->node_id       = client->device->node_id;
 208         event->local_node_id = card->local_node->node_id;
 209         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 210         event->irm_node_id   = card->irm_node->node_id;
 211         event->root_node_id  = card->root_node->node_id;
 212         event->generation    = card->generation;
 213 }
 214
 215 static void
 216 for_each_client(struct fw_device *device,
 217                 void (*callback)(struct client *client))
 218 {
 219         struct fw_card *card = device->card;
 220         struct client *c;
 221         unsigned long flags;
 222
 223         spin_lock_irqsave(&card->lock, flags);
 224
 225         list_for_each_entry(c, &device->client_list, link)
 226                 callback(c);
 227
 228         spin_unlock_irqrestore(&card->lock, flags);
 229 }
 230
 231 static void
 232 queue_bus_reset_event(struct client *client)
 233 {
 234         struct bus_reset *bus_reset;
 235
 236         bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
 237         if (bus_reset == NULL) {
 238                 fw_notify("Out of memory when allocating bus reset event\n");
 239                 return;
 240         }
 241
 242         fill_bus_reset_event(&bus_reset->reset, client);
 243
 244         queue_event(client, &bus_reset->event,
 245                     &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
 246 }
 247
 248 void fw_device_cdev_update(struct fw_device *device)
 249 {
 250         for_each_client(device, queue_bus_reset_event);
 251 }
 252
 253 static void wake_up_client(struct client *client)
 254 {
 255         wake_up_interruptible(&client->wait);
 256 }
 257
 258 void fw_device_cdev_remove(struct fw_device *device)
 259 {
 260         for_each_client(device, wake_up_client);
 261 }
 262
 263 static int ioctl_get_info(struct client *client, void *buffer)
 264 {
 265         struct fw_cdev_get_info *get_info = buffer;
 266         struct fw_cdev_event_bus_reset bus_reset;
 267
 268         client->version = get_info->version;
 269         get_info->version = FW_CDEV_VERSION;
 270
 271         if (get_info->rom != 0) {
 272                 void __user *uptr = u64_to_uptr(get_info->rom);
 273                 size_t want = get_info->rom_length;
 274                 size_t have = client->device->config_rom_length * 4;
 275
 276                 if (copy_to_user(uptr, client->device->config_rom,
 277                                  min(want, have)))
 278                         return -EFAULT;
 279         }
 280         get_info->rom_length = client->device->config_rom_length * 4;
 281
 282         client->bus_reset_closure = get_info->bus_reset_closure;
 283         if (get_info->bus_reset != 0) {
 284                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 285
 286                 fill_bus_reset_event(&bus_reset, client);
 287                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 288                         return -EFAULT;
 289         }
 290
 291         get_info->card = client->device->card->index;
 292
 293         return 0;
 294 }
 295
 296 static void
 297 add_client_resource(struct client *client, struct client_resource *resource)
 298 {
 299         unsigned long flags;
 300
 301         spin_lock_irqsave(&client->lock, flags);
 302         list_add_tail(&resource->link, &client->resource_list);
 303         resource->handle = client->resource_handle++;
 304         spin_unlock_irqrestore(&client->lock, flags);
 305 }
 306
 307 static int
 308 release_client_resource(struct client *client, u32 handle,
 309                         struct client_resource **resource)
 310 {
 311         struct client_resource *r;
 312         unsigned long flags;
 313
 314         spin_lock_irqsave(&client->lock, flags);
 315         list_for_each_entry(r, &client->resource_list, link) {
 316                 if (r->handle == handle) {
 317                         list_del(&r->link);
 318                         break;
 319                 }
 320         }
 321         spin_unlock_irqrestore(&client->lock, flags);
 322
 323         if (&r->link == &client->resource_list)
 324                 return -EINVAL;
 325
 326         if (resource)
 327                 *resource = r;
 328         else
 329                 r->release(client, r);
 330
 331         return 0;
 332 }
 333
 334 static void
 335 release_transaction(struct client *client, struct client_resource *resource)
 336 {
 337         struct response *response =
 338                 container_of(resource, struct response, resource);
 339
 340         fw_cancel_transaction(client->device->card, &response->transaction);
 341 }
 342
 343 static void
 344 complete_transaction(struct fw_card *card, int rcode,
 345                      void *payload, size_t length, void *data)
 346 {
 347         struct response *response = data;
 348         struct client *client = response->client;
 349         unsigned long flags;
 350
 351         if (length < response->response.length)
 352                 response->response.length = length;
 353         if (rcode == RCODE_COMPLETE)
 354                 memcpy(response->response.data, payload,
 355                        response->response.length);
 356
 357         spin_lock_irqsave(&client->lock, flags);
 358         list_del(&response->resource.link);
 359         spin_unlock_irqrestore(&client->lock, flags);
 360
 361         response->response.type   = FW_CDEV_EVENT_RESPONSE;
 362         response->response.rcode  = rcode;
 363         queue_event(client, &response->event,
 364                     &response->response, sizeof(response->response),
 365                     response->response.data, response->response.length);
 366 }
 367
 368 static int ioctl_send_request(struct client *client, void *buffer)
 369 {
 370         struct fw_device *device = client->device;
 371         struct fw_cdev_send_request *request = buffer;
 372         struct response *response;
 373
 374         /* What is the biggest size we'll accept, really? */
 375         if (request->length > 4096)
 376                 return -EINVAL;
 377
 378         response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
 379         if (response == NULL)
 380                 return -ENOMEM;
 381
 382         response->client = client;
 383         response->response.length = request->length;
 384         response->response.closure = request->closure;
 385
 386         if (request->data &&
 387             copy_from_user(response->response.data,
 388                            u64_to_uptr(request->data), request->length)) {
 389                 kfree(response);
 390                 return -EFAULT;
 391         }
 392
 393         response->resource.release = release_transaction;
 394         add_client_resource(client, &response->resource);
 395
 396         fw_send_request(device->card, &response->transaction,
 397                         request->tcode & 0x1f,
 398                         device->node->node_id,
 399                         request->generation,
 400                         device->max_speed,
 401                         request->offset,
 402                         response->response.data, request->length,
 403                         complete_transaction, response);
 404
 405         if (request->data)
 406                 return sizeof(request) + request->length;
 407         else
 408                 return sizeof(request);
 409 }
 410
 411 struct address_handler {
 412         struct fw_address_handler handler;
 413         __u64 closure;
 414         struct client *client;
 415         struct client_resource resource;
 416 };
 417
 418 struct request {
 419         struct fw_request *request;
 420         void *data;
 421         size_t length;
 422         struct client_resource resource;
 423 };
 424
 425 struct request_event {
 426         struct event event;
 427         struct fw_cdev_event_request request;
 428 };
 429
 430 static void
 431 release_request(struct client *client, struct client_resource *resource)
 432 {
 433         struct request *request =
 434                 container_of(resource, struct request, resource);
 435
 436         fw_send_response(client->device->card, request->request,
 437                          RCODE_CONFLICT_ERROR);
 438         kfree(request);
 439 }
 440
 441 static void
 442 handle_request(struct fw_card *card, struct fw_request *r,
 443                int tcode, int destination, int source,
 444                int generation, int speed,
 445                unsigned long long offset,
 446                void *payload, size_t length, void *callback_data)
 447 {
 448         struct address_handler *handler = callback_data;
 449         struct request *request;
 450         struct request_event *e;
 451         struct client *client = handler->client;
 452
 453         request = kmalloc(sizeof(*request), GFP_ATOMIC);
 454         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 455         if (request == NULL || e == NULL) {
 456                 kfree(request);
 457                 kfree(e);
 458                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
 459                 return;
 460         }
 461
 462         request->request = r;
 463         request->data    = payload;
 464         request->length  = length;
 465
 466         request->resource.release = release_request;
 467         add_client_resource(client, &request->resource);
 468
 469         e->request.type    = FW_CDEV_EVENT_REQUEST;
 470         e->request.tcode   = tcode;
 471         e->request.offset  = offset;
 472         e->request.length  = length;
 473         e->request.handle  = request->resource.handle;
 474         e->request.closure = handler->closure;
 475
 476         queue_event(client, &e->event,
 477                     &e->request, sizeof(e->request), payload, length);
 478 }
 479
 480 static void
 481 release_address_handler(struct client *client,
 482                         struct client_resource *resource)
 483 {
 484         struct address_handler *handler =
 485                 container_of(resource, struct address_handler, resource);
 486
 487         fw_core_remove_address_handler(&handler->handler);
 488         kfree(handler);
 489 }
 490
 491 static int ioctl_allocate(struct client *client, void *buffer)
 492 {
 493         struct fw_cdev_allocate *request = buffer;
 494         struct address_handler *handler;
 495         struct fw_address_region region;
 496
 497         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
 498         if (handler == NULL)
 499                 return -ENOMEM;
 500
 501         region.start = request->offset;
 502         region.end = request->offset + request->length;
 503         handler->handler.length = request->length;
 504         handler->handler.address_callback = handle_request;
 505         handler->handler.callback_data = handler;
 506         handler->closure = request->closure;
 507         handler->client = client;
 508
 509         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
 510                 kfree(handler);
 511                 return -EBUSY;
 512         }
 513
 514         handler->resource.release = release_address_handler;
 515         add_client_resource(client, &handler->resource);
 516         request->handle = handler->resource.handle;
 517
 518         return 0;
 519 }
 520
 521 static int ioctl_deallocate(struct client *client, void *buffer)
 522 {
 523         struct fw_cdev_deallocate *request = buffer;
 524
 525         return release_client_resource(client, request->handle, NULL);
 526 }
 527
 528 static int ioctl_send_response(struct client *client, void *buffer)
 529 {
 530         struct fw_cdev_send_response *request = buffer;
 531         struct client_resource *resource;
 532         struct request *r;
 533
 534         if (release_client_resource(client, request->handle, &resource) < 0)
 535                 return -EINVAL;
 536         r = container_of(resource, struct request, resource);
 537         if (request->length < r->length)
 538                 r->length = request->length;
 539         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 540                 return -EFAULT;
 541
 542         fw_send_response(client->device->card, r->request, request->rcode);
 543         kfree(r);
 544
 545         return 0;
 546 }
 547
 548 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 549 {
 550         struct fw_cdev_initiate_bus_reset *request = buffer;
 551         int short_reset;
 552
 553         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 554
 555         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 556 }
 557
 558 struct descriptor {
 559         struct fw_descriptor d;
 560         struct client_resource resource;
 561         u32 data[0];
 562 };
 563
 564 static void release_descriptor(struct client *client,
 565                                struct client_resource *resource)
 566 {
 567         struct descriptor *descriptor =
 568                 container_of(resource, struct descriptor, resource);
 569
 570         fw_core_remove_descriptor(&descriptor->d);
 571         kfree(descriptor);
 572 }
 573
 574 static int ioctl_add_descriptor(struct client *client, void *buffer)
 575 {
 576         struct fw_cdev_add_descriptor *request = buffer;
 577         struct descriptor *descriptor;
 578         int retval;
 579
 580         if (request->length > 256)
 581                 return -EINVAL;
 582
 583         descriptor =
 584                 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
 585         if (descriptor == NULL)
 586                 return -ENOMEM;
 587
 588         if (copy_from_user(descriptor->data,
 589                            u64_to_uptr(request->data), request->length * 4)) {
 590                 kfree(descriptor);
 591                 return -EFAULT;
 592         }
 593
 594         descriptor->d.length = request->length;
 595         descriptor->d.immediate = request->immediate;
 596         descriptor->d.key = request->key;
 597         descriptor->d.data = descriptor->data;
 598
 599         retval = fw_core_add_descriptor(&descriptor->d);
 600         if (retval < 0) {
 601                 kfree(descriptor);
 602                 return retval;
 603         }
 604
 605         descriptor->resource.release = release_descriptor;
 606         add_client_resource(client, &descriptor->resource);
 607         request->handle = descriptor->resource.handle;
 608
 609         return 0;
 610 }
 611
 612 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 613 {
 614         struct fw_cdev_remove_descriptor *request = buffer;
 615
 616         return release_client_resource(client, request->handle, NULL);
 617 }
 618
 619 static void
 620 iso_callback(struct fw_iso_context *context, u32 cycle,
 621              size_t header_length, void *header, void *data)
 622 {
 623         struct client *client = data;
 624         struct iso_interrupt *interrupt;
 625
 626         interrupt = kzalloc(sizeof(*interrupt) + header_length, GFP_ATOMIC);
 627         if (interrupt == NULL)
 628                 return;
 629
 630         interrupt->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 631         interrupt->interrupt.closure   = client->iso_closure;
 632         interrupt->interrupt.cycle     = cycle;
 633         interrupt->interrupt.header_length = header_length;
 634         memcpy(interrupt->interrupt.header, header, header_length);
 635         queue_event(client, &interrupt->event,
 636                     &interrupt->interrupt,
 637                     sizeof(interrupt->interrupt) + header_length, NULL, 0);
 638 }
 639
 640 static int ioctl_create_iso_context(struct client *client, void *buffer)
 641 {
 642         struct fw_cdev_create_iso_context *request = buffer;
 643         struct fw_iso_context *context;
 644
 645         if (request->channel > 63)
 646                 return -EINVAL;
 647
 648         switch (request->type) {
 649         case FW_ISO_CONTEXT_RECEIVE:
 650                 if (request->header_size < 4 || (request->header_size & 3))
 651                         return -EINVAL;
 652
 653                 break;
 654
 655         case FW_ISO_CONTEXT_TRANSMIT:
 656                 if (request->speed > SCODE_3200)
 657                         return -EINVAL;
 658
 659                 break;
 660
 661         default:
 662                 return -EINVAL;
 663         }
 664
 665         context =  fw_iso_context_create(client->device->card,
 666                                          request->type,
 667                                          request->channel,
 668                                          request->speed,
 669                                          request->header_size,
 670                                          iso_callback, client);
 671         if (IS_ERR(context))
 672                 return PTR_ERR(context);
 673
 674         client->iso_closure = request->closure;
 675         client->iso_context = context;
 676
 677         /* We only support one context at this time. */
 678         request->handle = 0;
 679
 680         return 0;
 681 }
 682
 683 /* Macros for decoding the iso packet control header. */
 684 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 685 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 686 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 687 #define GET_TAG(v)              (((v) >> 18) & 0x02)
 688 #define GET_SY(v)               (((v) >> 20) & 0x04)
 689 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 690
 691 static int ioctl_queue_iso(struct client *client, void *buffer)
 692 {
 693         struct fw_cdev_queue_iso *request = buffer;
 694         struct fw_cdev_iso_packet __user *p, *end, *next;
 695         struct fw_iso_context *ctx = client->iso_context;
 696         unsigned long payload, buffer_end, header_length;
 697         u32 control;
 698         int count;
 699         struct {
 700                 struct fw_iso_packet packet;
 701                 u8 header[256];
 702         } u;
 703
 704         if (ctx == NULL || request->handle != 0)
 705                 return -EINVAL;
 706
 707         /*
 708          * If the user passes a non-NULL data pointer, has mmap()'ed
 709          * the iso buffer, and the pointer points inside the buffer,
 710          * we setup the payload pointers accordingly.  Otherwise we
 711          * set them both to 0, which will still let packets with
 712          * payload_length == 0 through.  In other words, if no packets
 713          * use the indirect payload, the iso buffer need not be mapped
 714          * and the request->data pointer is ignored.
 715          */
 716
 717         payload = (unsigned long)request->data - client->vm_start;
 718         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 719         if (request->data == 0 || client->buffer.pages == NULL ||
 720             payload >= buffer_end) {
 721                 payload = 0;
 722                 buffer_end = 0;
 723         }
 724
 725         if (!access_ok(VERIFY_READ, request->packets, request->size))
 726                 return -EFAULT;
 727
 728         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 729         end = (void __user *)p + request->size;
 730         count = 0;
 731         while (p < end) {
 732                 if (get_user(control, &p->control))
 733                         return -EFAULT;
 734                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 735                 u.packet.interrupt = GET_INTERRUPT(control);
 736                 u.packet.skip = GET_SKIP(control);
 737                 u.packet.tag = GET_TAG(control);
 738                 u.packet.sy = GET_SY(control);
 739                 u.packet.header_length = GET_HEADER_LENGTH(control);
 740
 741                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 742                         header_length = u.packet.header_length;
 743                 } else {
 744                         /*
 745                          * We require that header_length is a multiple of
 746                          * the fixed header size, ctx->header_size.
 747                          */
 748                         if (ctx->header_size == 0) {
 749                                 if (u.packet.header_length > 0)
 750                                         return -EINVAL;
 751                         } else if (u.packet.header_length % ctx->header_size != 0) {
 752                                 return -EINVAL;
 753                         }
 754                         header_length = 0;
 755                 }
 756
 757                 next = (struct fw_cdev_iso_packet __user *)
 758                         &p->header[header_length / 4];
 759                 if (next > end)
 760                         return -EINVAL;
 761                 if (__copy_from_user
 762                     (u.packet.header, p->header, header_length))
 763                         return -EFAULT;
 764                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 765                     u.packet.header_length + u.packet.payload_length > 0)
 766                         return -EINVAL;
 767                 if (payload + u.packet.payload_length > buffer_end)
 768                         return -EINVAL;
 769
 770                 if (fw_iso_context_queue(ctx, &u.packet,
 771                                          &client->buffer, payload))
 772                         break;
 773
 774                 p = next;
 775                 payload += u.packet.payload_length;
 776                 count++;
 777         }
 778
 779         request->size    -= uptr_to_u64(p) - request->packets;
 780         request->packets  = uptr_to_u64(p);
 781         request->data     = client->vm_start + payload;
 782
 783         return count;
 784 }
 785
 786 static int ioctl_start_iso(struct client *client, void *buffer)
 787 {
 788         struct fw_cdev_start_iso *request = buffer;
 789
 790         if (request->handle != 0)
 791                 return -EINVAL;
 792         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 793                 if (request->tags == 0 || request->tags > 15)
 794                         return -EINVAL;
 795
 796                 if (request->sync > 15)
 797                         return -EINVAL;
 798         }
 799
 800         return fw_iso_context_start(client->iso_context, request->cycle,
 801                                     request->sync, request->tags);
 802 }
 803
 804 static int ioctl_stop_iso(struct client *client, void *buffer)
 805 {
 806         struct fw_cdev_stop_iso *request = buffer;
 807
 808         if (request->handle != 0)
 809                 return -EINVAL;
 810
 811         return fw_iso_context_stop(client->iso_context);
 812 }
 813
 814 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
 815         ioctl_get_info,
 816         ioctl_send_request,
 817         ioctl_allocate,
 818         ioctl_deallocate,
 819         ioctl_send_response,
 820         ioctl_initiate_bus_reset,
 821         ioctl_add_descriptor,
 822         ioctl_remove_descriptor,
 823         ioctl_create_iso_context,
 824         ioctl_queue_iso,
 825         ioctl_start_iso,
 826         ioctl_stop_iso,
 827 };
 828
 829 static int
 830 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
 831 {
 832         char buffer[256];
 833         int retval;
 834
 835         if (_IOC_TYPE(cmd) != '#' ||
 836             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
 837                 return -EINVAL;
 838
 839         if (_IOC_DIR(cmd) & _IOC_WRITE) {
 840                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 841                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
 842                         return -EFAULT;
 843         }
 844
 845         retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
 846         if (retval < 0)
 847                 return retval;
 848
 849         if (_IOC_DIR(cmd) & _IOC_READ) {
 850                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
 851                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
 852                         return -EFAULT;
 853         }
 854
 855         return 0;
 856 }
 857
 858 static long
 859 fw_device_op_ioctl(struct file *file,
 860                    unsigned int cmd, unsigned long arg)
 861 {
 862         struct client *client = file->private_data;
 863
 864         return dispatch_ioctl(client, cmd, (void __user *) arg);
 865 }
 866
 867 #ifdef CONFIG_COMPAT
 868 static long
 869 fw_device_op_compat_ioctl(struct file *file,
 870                           unsigned int cmd, unsigned long arg)
 871 {
 872         struct client *client = file->private_data;
 873
 874         return dispatch_ioctl(client, cmd, compat_ptr(arg));
 875 }
 876 #endif
 877
 878 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 879 {
 880         struct client *client = file->private_data;
 881         enum dma_data_direction direction;
 882         unsigned long size;
 883         int page_count, retval;
 884
 885         /* FIXME: We could support multiple buffers, but we don't. */
 886         if (client->buffer.pages != NULL)
 887                 return -EBUSY;
 888
 889         if (!(vma->vm_flags & VM_SHARED))
 890                 return -EINVAL;
 891
 892         if (vma->vm_start & ~PAGE_MASK)
 893                 return -EINVAL;
 894
 895         client->vm_start = vma->vm_start;
 896         size = vma->vm_end - vma->vm_start;
 897         page_count = size >> PAGE_SHIFT;
 898         if (size & ~PAGE_MASK)
 899                 return -EINVAL;
 900
 901         if (vma->vm_flags & VM_WRITE)
 902                 direction = DMA_TO_DEVICE;
 903         else
 904                 direction = DMA_FROM_DEVICE;
 905
 906         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
 907                                     page_count, direction);
 908         if (retval < 0)
 909                 return retval;
 910
 911         retval = fw_iso_buffer_map(&client->buffer, vma);
 912         if (retval < 0)
 913                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 914
 915         return retval;
 916 }
 917
 918 static int fw_device_op_release(struct inode *inode, struct file *file)
 919 {
 920         struct client *client = file->private_data;
 921         struct event *e, *next_e;
 922         struct client_resource *r, *next_r;
 923         unsigned long flags;
 924
 925         if (client->buffer.pages)
 926                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 927
 928         if (client->iso_context)
 929                 fw_iso_context_destroy(client->iso_context);
 930
 931         list_for_each_entry_safe(r, next_r, &client->resource_list, link)
 932                 r->release(client, r);
 933
 934         /*
 935          * FIXME: We should wait for the async tasklets to stop
 936          * running before freeing the memory.
 937          */
 938
 939         list_for_each_entry_safe(e, next_e, &client->event_list, link)
 940                 kfree(e);
 941
 942         spin_lock_irqsave(&client->device->card->lock, flags);
 943         list_del(&client->link);
 944         spin_unlock_irqrestore(&client->device->card->lock, flags);
 945
 946         fw_device_put(client->device);
 947         kfree(client);
 948
 949         return 0;
 950 }
 951
 952 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
 953 {
 954         struct client *client = file->private_data;
 955         unsigned int mask = 0;
 956
 957         poll_wait(file, &client->wait, pt);
 958
 959         if (fw_device_is_shutdown(client->device))
 960                 mask |= POLLHUP | POLLERR;
 961         if (!list_empty(&client->event_list))
 962                 mask |= POLLIN | POLLRDNORM;
 963
 964         return mask;
 965 }
 966
 967 const struct file_operations fw_device_ops = {
 968         .owner          = THIS_MODULE,
 969         .open           = fw_device_op_open,
 970         .read           = fw_device_op_read,
 971         .unlocked_ioctl = fw_device_op_ioctl,
 972         .poll           = fw_device_op_poll,
 973         .release        = fw_device_op_release,
 974         .mmap           = fw_device_op_mmap,
 975
 976 #ifdef CONFIG_COMPAT
 977         .compat_ioctl   = fw_device_op_compat_ioctl,
 978 #endif
 979 };