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/compat.h>
  22 #include <linux/delay.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/firewire-cdev.h>
  26 #include <linux/idr.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/kernel.h>
  29 #include <linux/kref.h>
  30 #include <linux/mm.h>
  31 #include <linux/module.h>
  32 #include <linux/mutex.h>
  33 #include <linux/poll.h>
  34 #include <linux/preempt.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/time.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/wait.h>
  39 #include <linux/workqueue.h>
  40
  41 #include <asm/system.h>
  42 #include <asm/uaccess.h>
  43
  44 #include "fw-device.h"
  45 #include "fw-topology.h"
  46 #include "fw-transaction.h"
  47
  48 struct client {
  49         u32 version;
  50         struct fw_device *device;
  51
  52         spinlock_t lock;
  53         bool in_shutdown;
  54         struct idr resource_idr;
  55         struct list_head event_list;
  56         wait_queue_head_t wait;
  57         u64 bus_reset_closure;
  58
  59         struct fw_iso_context *iso_context;
  60         u64 iso_closure;
  61         struct fw_iso_buffer buffer;
  62         unsigned long vm_start;
  63
  64         struct list_head link;
  65         struct kref kref;
  66 };
  67
  68 static inline void client_get(struct client *client)
  69 {
  70         kref_get(&client->kref);
  71 }
  72
  73 static void client_release(struct kref *kref)
  74 {
  75         struct client *client = container_of(kref, struct client, kref);
  76
  77         fw_device_put(client->device);
  78         kfree(client);
  79 }
  80
  81 static void client_put(struct client *client)
  82 {
  83         kref_put(&client->kref, client_release);
  84 }
  85
  86 struct client_resource;
  87 typedef void (*client_resource_release_fn_t)(struct client *,
  88                                              struct client_resource *);
  89 struct client_resource {
  90         client_resource_release_fn_t release;
  91         int handle;
  92 };
  93
  94 struct address_handler_resource {
  95         struct client_resource resource;
  96         struct fw_address_handler handler;
  97         __u64 closure;
  98         struct client *client;
  99 };
 100
 101 struct outbound_transaction_resource {
 102         struct client_resource resource;
 103         struct fw_transaction transaction;
 104 };
 105
 106 struct inbound_transaction_resource {
 107         struct client_resource resource;
 108         struct fw_request *request;
 109         void *data;
 110         size_t length;
 111 };
 112
 113 struct descriptor_resource {
 114         struct client_resource resource;
 115         struct fw_descriptor descriptor;
 116         u32 data[0];
 117 };
 118
 119 struct iso_resource {
 120         struct client_resource resource;
 121         struct client *client;
 122         /* Schedule work and access todo only with client->lock held. */
 123         struct delayed_work work;
 124         enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
 125               ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
 126         int generation;
 127         u64 channels;
 128         s32 bandwidth;
 129         struct iso_resource_event *e_alloc, *e_dealloc;
 130 };
 131
 132 static int schedule_iso_resource(struct iso_resource *);
 133 static void release_iso_resource(struct client *, struct client_resource *);
 134
 135 /*
 136  * dequeue_event() just kfree()'s the event, so the event has to be
 137  * the first field in a struct XYZ_event.
 138  */
 139 struct event {
 140         struct { void *data; size_t size; } v[2];
 141         struct list_head link;
 142 };
 143
 144 struct bus_reset_event {
 145         struct event event;
 146         struct fw_cdev_event_bus_reset reset;
 147 };
 148
 149 struct outbound_transaction_event {
 150         struct event event;
 151         struct client *client;
 152         struct outbound_transaction_resource r;
 153         struct fw_cdev_event_response response;
 154 };
 155
 156 struct inbound_transaction_event {
 157         struct event event;
 158         struct fw_cdev_event_request request;
 159 };
 160
 161 struct iso_interrupt_event {
 162         struct event event;
 163         struct fw_cdev_event_iso_interrupt interrupt;
 164 };
 165
 166 struct iso_resource_event {
 167         struct event event;
 168         struct fw_cdev_event_iso_resource resource;
 169 };
 170
 171 static inline void __user *u64_to_uptr(__u64 value)
 172 {
 173         return (void __user *)(unsigned long)value;
 174 }
 175
 176 static inline __u64 uptr_to_u64(void __user *ptr)
 177 {
 178         return (__u64)(unsigned long)ptr;
 179 }
 180
 181 static int fw_device_op_open(struct inode *inode, struct file *file)
 182 {
 183         struct fw_device *device;
 184         struct client *client;
 185
 186         device = fw_device_get_by_devt(inode->i_rdev);
 187         if (device == NULL)
 188                 return -ENODEV;
 189
 190         if (fw_device_is_shutdown(device)) {
 191                 fw_device_put(device);
 192                 return -ENODEV;
 193         }
 194
 195         client = kzalloc(sizeof(*client), GFP_KERNEL);
 196         if (client == NULL) {
 197                 fw_device_put(device);
 198                 return -ENOMEM;
 199         }
 200
 201         client->device = device;
 202         spin_lock_init(&client->lock);
 203         idr_init(&client->resource_idr);
 204         INIT_LIST_HEAD(&client->event_list);
 205         init_waitqueue_head(&client->wait);
 206         kref_init(&client->kref);
 207
 208         file->private_data = client;
 209
 210         mutex_lock(&device->client_list_mutex);
 211         list_add_tail(&client->link, &device->client_list);
 212         mutex_unlock(&device->client_list_mutex);
 213
 214         return 0;
 215 }
 216
 217 static void queue_event(struct client *client, struct event *event,
 218                         void *data0, size_t size0, void *data1, size_t size1)
 219 {
 220         unsigned long flags;
 221
 222         event->v[0].data = data0;
 223         event->v[0].size = size0;
 224         event->v[1].data = data1;
 225         event->v[1].size = size1;
 226
 227         spin_lock_irqsave(&client->lock, flags);
 228         if (client->in_shutdown)
 229                 kfree(event);
 230         else
 231                 list_add_tail(&event->link, &client->event_list);
 232         spin_unlock_irqrestore(&client->lock, flags);
 233
 234         wake_up_interruptible(&client->wait);
 235 }
 236
 237 static int dequeue_event(struct client *client,
 238                          char __user *buffer, size_t count)
 239 {
 240         unsigned long flags;
 241         struct event *event;
 242         size_t size, total;
 243         int i, ret;
 244
 245         ret = wait_event_interruptible(client->wait,
 246                         !list_empty(&client->event_list) ||
 247                         fw_device_is_shutdown(client->device));
 248         if (ret < 0)
 249                 return ret;
 250
 251         if (list_empty(&client->event_list) &&
 252                        fw_device_is_shutdown(client->device))
 253                 return -ENODEV;
 254
 255         spin_lock_irqsave(&client->lock, flags);
 256         event = list_first_entry(&client->event_list, struct event, link);
 257         list_del(&event->link);
 258         spin_unlock_irqrestore(&client->lock, flags);
 259
 260         total = 0;
 261         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 262                 size = min(event->v[i].size, count - total);
 263                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 264                         ret = -EFAULT;
 265                         goto out;
 266                 }
 267                 total += size;
 268         }
 269         ret = total;
 270
 271  out:
 272         kfree(event);
 273
 274         return ret;
 275 }
 276
 277 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 278                                  size_t count, loff_t *offset)
 279 {
 280         struct client *client = file->private_data;
 281
 282         return dequeue_event(client, buffer, count);
 283 }
 284
 285 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 286                                  struct client *client)
 287 {
 288         struct fw_card *card = client->device->card;
 289         unsigned long flags;
 290
 291         spin_lock_irqsave(&card->lock, flags);
 292
 293         event->closure       = client->bus_reset_closure;
 294         event->type          = FW_CDEV_EVENT_BUS_RESET;
 295         event->generation    = client->device->generation;
 296         event->node_id       = client->device->node_id;
 297         event->local_node_id = card->local_node->node_id;
 298         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 299         event->irm_node_id   = card->irm_node->node_id;
 300         event->root_node_id  = card->root_node->node_id;
 301
 302         spin_unlock_irqrestore(&card->lock, flags);
 303 }
 304
 305 static void for_each_client(struct fw_device *device,
 306                             void (*callback)(struct client *client))
 307 {
 308         struct client *c;
 309
 310         mutex_lock(&device->client_list_mutex);
 311         list_for_each_entry(c, &device->client_list, link)
 312                 callback(c);
 313         mutex_unlock(&device->client_list_mutex);
 314 }
 315
 316 static int schedule_reallocations(int id, void *p, void *data)
 317 {
 318         struct client_resource *r = p;
 319
 320         if (r->release == release_iso_resource)
 321                 schedule_iso_resource(container_of(r,
 322                                         struct iso_resource, resource));
 323         return 0;
 324 }
 325
 326 static void queue_bus_reset_event(struct client *client)
 327 {
 328         struct bus_reset_event *e;
 329
 330         e = kzalloc(sizeof(*e), GFP_KERNEL);
 331         if (e == NULL) {
 332                 fw_notify("Out of memory when allocating bus reset event\n");
 333                 return;
 334         }
 335
 336         fill_bus_reset_event(&e->reset, client);
 337
 338         queue_event(client, &e->event,
 339                     &e->reset, sizeof(e->reset), NULL, 0);
 340
 341         spin_lock_irq(&client->lock);
 342         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 343         spin_unlock_irq(&client->lock);
 344 }
 345
 346 void fw_device_cdev_update(struct fw_device *device)
 347 {
 348         for_each_client(device, queue_bus_reset_event);
 349 }
 350
 351 static void wake_up_client(struct client *client)
 352 {
 353         wake_up_interruptible(&client->wait);
 354 }
 355
 356 void fw_device_cdev_remove(struct fw_device *device)
 357 {
 358         for_each_client(device, wake_up_client);
 359 }
 360
 361 static int ioctl_get_info(struct client *client, void *buffer)
 362 {
 363         struct fw_cdev_get_info *get_info = buffer;
 364         struct fw_cdev_event_bus_reset bus_reset;
 365         unsigned long ret = 0;
 366
 367         client->version = get_info->version;
 368         get_info->version = FW_CDEV_VERSION;
 369         get_info->card = client->device->card->index;
 370
 371         down_read(&fw_device_rwsem);
 372
 373         if (get_info->rom != 0) {
 374                 void __user *uptr = u64_to_uptr(get_info->rom);
 375                 size_t want = get_info->rom_length;
 376                 size_t have = client->device->config_rom_length * 4;
 377
 378                 ret = copy_to_user(uptr, client->device->config_rom,
 379                                    min(want, have));
 380         }
 381         get_info->rom_length = client->device->config_rom_length * 4;
 382
 383         up_read(&fw_device_rwsem);
 384
 385         if (ret != 0)
 386                 return -EFAULT;
 387
 388         client->bus_reset_closure = get_info->bus_reset_closure;
 389         if (get_info->bus_reset != 0) {
 390                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 391
 392                 fill_bus_reset_event(&bus_reset, client);
 393                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 394                         return -EFAULT;
 395         }
 396
 397         return 0;
 398 }
 399
 400 static int add_client_resource(struct client *client,
 401                                struct client_resource *resource, gfp_t gfp_mask)
 402 {
 403         unsigned long flags;
 404         int ret;
 405
 406  retry:
 407         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 408                 return -ENOMEM;
 409
 410         spin_lock_irqsave(&client->lock, flags);
 411         if (client->in_shutdown)
 412                 ret = -ECANCELED;
 413         else
 414                 ret = idr_get_new(&client->resource_idr, resource,
 415                                   &resource->handle);
 416         if (ret >= 0) {
 417                 client_get(client);
 418                 if (resource->release == release_iso_resource)
 419                         schedule_iso_resource(container_of(resource,
 420                                                 struct iso_resource, resource));
 421         }
 422         spin_unlock_irqrestore(&client->lock, flags);
 423
 424         if (ret == -EAGAIN)
 425                 goto retry;
 426
 427         return ret < 0 ? ret : 0;
 428 }
 429
 430 static int release_client_resource(struct client *client, u32 handle,
 431                                    client_resource_release_fn_t release,
 432                                    struct client_resource **resource)
 433 {
 434         struct client_resource *r;
 435         unsigned long flags;
 436
 437         spin_lock_irqsave(&client->lock, flags);
 438         if (client->in_shutdown)
 439                 r = NULL;
 440         else
 441                 r = idr_find(&client->resource_idr, handle);
 442         if (r && r->release == release)
 443                 idr_remove(&client->resource_idr, handle);
 444         spin_unlock_irqrestore(&client->lock, flags);
 445
 446         if (!(r && r->release == release))
 447                 return -EINVAL;
 448
 449         if (resource)
 450                 *resource = r;
 451         else
 452                 r->release(client, r);
 453
 454         client_put(client);
 455
 456         return 0;
 457 }
 458
 459 static void release_transaction(struct client *client,
 460                                 struct client_resource *resource)
 461 {
 462         struct outbound_transaction_resource *r = container_of(resource,
 463                         struct outbound_transaction_resource, resource);
 464
 465         fw_cancel_transaction(client->device->card, &r->transaction);
 466 }
 467
 468 static void complete_transaction(struct fw_card *card, int rcode,
 469                                  void *payload, size_t length, void *data)
 470 {
 471         struct outbound_transaction_event *e = data;
 472         struct fw_cdev_event_response *rsp = &e->response;
 473         struct client *client = e->client;
 474         unsigned long flags;
 475
 476         if (length < rsp->length)
 477                 rsp->length = length;
 478         if (rcode == RCODE_COMPLETE)
 479                 memcpy(rsp->data, payload, rsp->length);
 480
 481         spin_lock_irqsave(&client->lock, flags);
 482         /*
 483          * 1. If called while in shutdown, the idr tree must be left untouched.
 484          *    The idr handle will be removed and the client reference will be
 485          *    dropped later.
 486          * 2. If the call chain was release_client_resource ->
 487          *    release_transaction -> complete_transaction (instead of a normal
 488          *    conclusion of the transaction), i.e. if this resource was already
 489          *    unregistered from the idr, the client reference will be dropped
 490          *    by release_client_resource and we must not drop it here.
 491          */
 492         if (!client->in_shutdown &&
 493             idr_find(&client->resource_idr, e->r.resource.handle)) {
 494                 idr_remove(&client->resource_idr, e->r.resource.handle);
 495                 /* Drop the idr's reference */
 496                 client_put(client);
 497         }
 498         spin_unlock_irqrestore(&client->lock, flags);
 499
 500         rsp->type = FW_CDEV_EVENT_RESPONSE;
 501         rsp->rcode = rcode;
 502
 503         /*
 504          * In the case that sizeof(*rsp) doesn't align with the position of the
 505          * data, and the read is short, preserve an extra copy of the data
 506          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 507          * for short reads and some apps depended on it, this is both safe
 508          * and prudent for compatibility.
 509          */
 510         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 511                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 512                             rsp->data, rsp->length);
 513         else
 514                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 515                             NULL, 0);
 516
 517         /* Drop the transaction callback's reference */
 518         client_put(client);
 519 }
 520
 521 static int init_request(struct client *client,
 522                         struct fw_cdev_send_request *request,
 523                         int destination_id, int speed)
 524 {
 525         struct outbound_transaction_event *e;
 526         int ret;
 527
 528         /* What is the biggest size we'll accept, really? */
 529         if (request->length > 4096)
 530                 return -EINVAL;
 531
 532         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 533         if (e == NULL)
 534                 return -ENOMEM;
 535
 536         e->client = client;
 537         e->response.length = request->length;
 538         e->response.closure = request->closure;
 539
 540         if (request->data &&
 541             copy_from_user(e->response.data,
 542                            u64_to_uptr(request->data), request->length)) {
 543                 ret = -EFAULT;
 544                 goto failed;
 545         }
 546
 547         e->r.resource.release = release_transaction;
 548         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 549         if (ret < 0)
 550                 goto failed;
 551
 552         /* Get a reference for the transaction callback */
 553         client_get(client);
 554
 555         fw_send_request(client->device->card, &e->r.transaction,
 556                         request->tcode & 0x1f, destination_id,
 557                         request->generation, speed, request->offset,
 558                         e->response.data, request->length,
 559                         complete_transaction, e);
 560
 561         if (request->data)
 562                 return sizeof(request) + request->length;
 563         else
 564                 return sizeof(request);
 565  failed:
 566         kfree(e);
 567
 568         return ret;
 569 }
 570
 571 static int ioctl_send_request(struct client *client, void *buffer)
 572 {
 573         struct fw_cdev_send_request *request = buffer;
 574
 575         switch (request->tcode) {
 576         case TCODE_WRITE_QUADLET_REQUEST:
 577         case TCODE_WRITE_BLOCK_REQUEST:
 578         case TCODE_READ_QUADLET_REQUEST:
 579         case TCODE_READ_BLOCK_REQUEST:
 580         case TCODE_LOCK_MASK_SWAP:
 581         case TCODE_LOCK_COMPARE_SWAP:
 582         case TCODE_LOCK_FETCH_ADD:
 583         case TCODE_LOCK_LITTLE_ADD:
 584         case TCODE_LOCK_BOUNDED_ADD:
 585         case TCODE_LOCK_WRAP_ADD:
 586         case TCODE_LOCK_VENDOR_DEPENDENT:
 587                 break;
 588         default:
 589                 return -EINVAL;
 590         }
 591
 592         return init_request(client, request, client->device->node->node_id,
 593                             client->device->max_speed);
 594 }
 595
 596 static void release_request(struct client *client,
 597                             struct client_resource *resource)
 598 {
 599         struct inbound_transaction_resource *r = container_of(resource,
 600                         struct inbound_transaction_resource, resource);
 601
 602         fw_send_response(client->device->card, r->request,
 603                          RCODE_CONFLICT_ERROR);
 604         kfree(r);
 605 }
 606
 607 static void handle_request(struct fw_card *card, struct fw_request *request,
 608                            int tcode, int destination, int source,
 609                            int generation, int speed,
 610                            unsigned long long offset,
 611                            void *payload, size_t length, void *callback_data)
 612 {
 613         struct address_handler_resource *handler = callback_data;
 614         struct inbound_transaction_resource *r;
 615         struct inbound_transaction_event *e;
 616         int ret;
 617
 618         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 619         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 620         if (r == NULL || e == NULL)
 621                 goto failed;
 622
 623         r->request = request;
 624         r->data    = payload;
 625         r->length  = length;
 626
 627         r->resource.release = release_request;
 628         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 629         if (ret < 0)
 630                 goto failed;
 631
 632         e->request.type    = FW_CDEV_EVENT_REQUEST;
 633         e->request.tcode   = tcode;
 634         e->request.offset  = offset;
 635         e->request.length  = length;
 636         e->request.handle  = r->resource.handle;
 637         e->request.closure = handler->closure;
 638
 639         queue_event(handler->client, &e->event,
 640                     &e->request, sizeof(e->request), payload, length);
 641         return;
 642
 643  failed:
 644         kfree(r);
 645         kfree(e);
 646         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 647 }
 648
 649 static void release_address_handler(struct client *client,
 650                                     struct client_resource *resource)
 651 {
 652         struct address_handler_resource *r =
 653             container_of(resource, struct address_handler_resource, resource);
 654
 655         fw_core_remove_address_handler(&r->handler);
 656         kfree(r);
 657 }
 658
 659 static int ioctl_allocate(struct client *client, void *buffer)
 660 {
 661         struct fw_cdev_allocate *request = buffer;
 662         struct address_handler_resource *r;
 663         struct fw_address_region region;
 664         int ret;
 665
 666         r = kmalloc(sizeof(*r), GFP_KERNEL);
 667         if (r == NULL)
 668                 return -ENOMEM;
 669
 670         region.start = request->offset;
 671         region.end = request->offset + request->length;
 672         r->handler.length = request->length;
 673         r->handler.address_callback = handle_request;
 674         r->handler.callback_data = r;
 675         r->closure = request->closure;
 676         r->client = client;
 677
 678         ret = fw_core_add_address_handler(&r->handler, &region);
 679         if (ret < 0) {
 680                 kfree(r);
 681                 return ret;
 682         }
 683
 684         r->resource.release = release_address_handler;
 685         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 686         if (ret < 0) {
 687                 release_address_handler(client, &r->resource);
 688                 return ret;
 689         }
 690         request->handle = r->resource.handle;
 691
 692         return 0;
 693 }
 694
 695 static int ioctl_deallocate(struct client *client, void *buffer)
 696 {
 697         struct fw_cdev_deallocate *request = buffer;
 698
 699         return release_client_resource(client, request->handle,
 700                                        release_address_handler, NULL);
 701 }
 702
 703 static int ioctl_send_response(struct client *client, void *buffer)
 704 {
 705         struct fw_cdev_send_response *request = buffer;
 706         struct client_resource *resource;
 707         struct inbound_transaction_resource *r;
 708
 709         if (release_client_resource(client, request->handle,
 710                                     release_request, &resource) < 0)
 711                 return -EINVAL;
 712
 713         r = container_of(resource, struct inbound_transaction_resource,
 714                          resource);
 715         if (request->length < r->length)
 716                 r->length = request->length;
 717         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 718                 return -EFAULT;
 719
 720         fw_send_response(client->device->card, r->request, request->rcode);
 721         kfree(r);
 722
 723         return 0;
 724 }
 725
 726 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 727 {
 728         struct fw_cdev_initiate_bus_reset *request = buffer;
 729         int short_reset;
 730
 731         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 732
 733         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 734 }
 735
 736 static void release_descriptor(struct client *client,
 737                                struct client_resource *resource)
 738 {
 739         struct descriptor_resource *r =
 740                 container_of(resource, struct descriptor_resource, resource);
 741
 742         fw_core_remove_descriptor(&r->descriptor);
 743         kfree(r);
 744 }
 745
 746 static int ioctl_add_descriptor(struct client *client, void *buffer)
 747 {
 748         struct fw_cdev_add_descriptor *request = buffer;
 749         struct descriptor_resource *r;
 750         int ret;
 751
 752         if (request->length > 256)
 753                 return -EINVAL;
 754
 755         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 756         if (r == NULL)
 757                 return -ENOMEM;
 758
 759         if (copy_from_user(r->data,
 760                            u64_to_uptr(request->data), request->length * 4)) {
 761                 ret = -EFAULT;
 762                 goto failed;
 763         }
 764
 765         r->descriptor.length    = request->length;
 766         r->descriptor.immediate = request->immediate;
 767         r->descriptor.key       = request->key;
 768         r->descriptor.data      = r->data;
 769
 770         ret = fw_core_add_descriptor(&r->descriptor);
 771         if (ret < 0)
 772                 goto failed;
 773
 774         r->resource.release = release_descriptor;
 775         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 776         if (ret < 0) {
 777                 fw_core_remove_descriptor(&r->descriptor);
 778                 goto failed;
 779         }
 780         request->handle = r->resource.handle;
 781
 782         return 0;
 783  failed:
 784         kfree(r);
 785
 786         return ret;
 787 }
 788
 789 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 790 {
 791         struct fw_cdev_remove_descriptor *request = buffer;
 792
 793         return release_client_resource(client, request->handle,
 794                                        release_descriptor, NULL);
 795 }
 796
 797 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 798                          size_t header_length, void *header, void *data)
 799 {
 800         struct client *client = data;
 801         struct iso_interrupt_event *e;
 802
 803         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 804         if (e == NULL)
 805                 return;
 806
 807         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 808         e->interrupt.closure   = client->iso_closure;
 809         e->interrupt.cycle     = cycle;
 810         e->interrupt.header_length = header_length;
 811         memcpy(e->interrupt.header, header, header_length);
 812         queue_event(client, &e->event, &e->interrupt,
 813                     sizeof(e->interrupt) + header_length, NULL, 0);
 814 }
 815
 816 static int ioctl_create_iso_context(struct client *client, void *buffer)
 817 {
 818         struct fw_cdev_create_iso_context *request = buffer;
 819         struct fw_iso_context *context;
 820
 821         /* We only support one context at this time. */
 822         if (client->iso_context != NULL)
 823                 return -EBUSY;
 824
 825         if (request->channel > 63)
 826                 return -EINVAL;
 827
 828         switch (request->type) {
 829         case FW_ISO_CONTEXT_RECEIVE:
 830                 if (request->header_size < 4 || (request->header_size & 3))
 831                         return -EINVAL;
 832
 833                 break;
 834
 835         case FW_ISO_CONTEXT_TRANSMIT:
 836                 if (request->speed > SCODE_3200)
 837                         return -EINVAL;
 838
 839                 break;
 840
 841         default:
 842                 return -EINVAL;
 843         }
 844
 845         context =  fw_iso_context_create(client->device->card,
 846                                          request->type,
 847                                          request->channel,
 848                                          request->speed,
 849                                          request->header_size,
 850                                          iso_callback, client);
 851         if (IS_ERR(context))
 852                 return PTR_ERR(context);
 853
 854         client->iso_closure = request->closure;
 855         client->iso_context = context;
 856
 857         /* We only support one context at this time. */
 858         request->handle = 0;
 859
 860         return 0;
 861 }
 862
 863 /* Macros for decoding the iso packet control header. */
 864 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 865 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 866 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 867 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 868 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 869 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 870
 871 static int ioctl_queue_iso(struct client *client, void *buffer)
 872 {
 873         struct fw_cdev_queue_iso *request = buffer;
 874         struct fw_cdev_iso_packet __user *p, *end, *next;
 875         struct fw_iso_context *ctx = client->iso_context;
 876         unsigned long payload, buffer_end, header_length;
 877         u32 control;
 878         int count;
 879         struct {
 880                 struct fw_iso_packet packet;
 881                 u8 header[256];
 882         } u;
 883
 884         if (ctx == NULL || request->handle != 0)
 885                 return -EINVAL;
 886
 887         /*
 888          * If the user passes a non-NULL data pointer, has mmap()'ed
 889          * the iso buffer, and the pointer points inside the buffer,
 890          * we setup the payload pointers accordingly.  Otherwise we
 891          * set them both to 0, which will still let packets with
 892          * payload_length == 0 through.  In other words, if no packets
 893          * use the indirect payload, the iso buffer need not be mapped
 894          * and the request->data pointer is ignored.
 895          */
 896
 897         payload = (unsigned long)request->data - client->vm_start;
 898         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 899         if (request->data == 0 || client->buffer.pages == NULL ||
 900             payload >= buffer_end) {
 901                 payload = 0;
 902                 buffer_end = 0;
 903         }
 904
 905         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 906
 907         if (!access_ok(VERIFY_READ, p, request->size))
 908                 return -EFAULT;
 909
 910         end = (void __user *)p + request->size;
 911         count = 0;
 912         while (p < end) {
 913                 if (get_user(control, &p->control))
 914                         return -EFAULT;
 915                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 916                 u.packet.interrupt = GET_INTERRUPT(control);
 917                 u.packet.skip = GET_SKIP(control);
 918                 u.packet.tag = GET_TAG(control);
 919                 u.packet.sy = GET_SY(control);
 920                 u.packet.header_length = GET_HEADER_LENGTH(control);
 921
 922                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 923                         header_length = u.packet.header_length;
 924                 } else {
 925                         /*
 926                          * We require that header_length is a multiple of
 927                          * the fixed header size, ctx->header_size.
 928                          */
 929                         if (ctx->header_size == 0) {
 930                                 if (u.packet.header_length > 0)
 931                                         return -EINVAL;
 932                         } else if (u.packet.header_length % ctx->header_size != 0) {
 933                                 return -EINVAL;
 934                         }
 935                         header_length = 0;
 936                 }
 937
 938                 next = (struct fw_cdev_iso_packet __user *)
 939                         &p->header[header_length / 4];
 940                 if (next > end)
 941                         return -EINVAL;
 942                 if (__copy_from_user
 943                     (u.packet.header, p->header, header_length))
 944                         return -EFAULT;
 945                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 946                     u.packet.header_length + u.packet.payload_length > 0)
 947                         return -EINVAL;
 948                 if (payload + u.packet.payload_length > buffer_end)
 949                         return -EINVAL;
 950
 951                 if (fw_iso_context_queue(ctx, &u.packet,
 952                                          &client->buffer, payload))
 953                         break;
 954
 955                 p = next;
 956                 payload += u.packet.payload_length;
 957                 count++;
 958         }
 959
 960         request->size    -= uptr_to_u64(p) - request->packets;
 961         request->packets  = uptr_to_u64(p);
 962         request->data     = client->vm_start + payload;
 963
 964         return count;
 965 }
 966
 967 static int ioctl_start_iso(struct client *client, void *buffer)
 968 {
 969         struct fw_cdev_start_iso *request = buffer;
 970
 971         if (client->iso_context == NULL || request->handle != 0)
 972                 return -EINVAL;
 973
 974         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 975                 if (request->tags == 0 || request->tags > 15)
 976                         return -EINVAL;
 977
 978                 if (request->sync > 15)
 979                         return -EINVAL;
 980         }
 981
 982         return fw_iso_context_start(client->iso_context, request->cycle,
 983                                     request->sync, request->tags);
 984 }
 985
 986 static int ioctl_stop_iso(struct client *client, void *buffer)
 987 {
 988         struct fw_cdev_stop_iso *request = buffer;
 989
 990         if (client->iso_context == NULL || request->handle != 0)
 991                 return -EINVAL;
 992
 993         return fw_iso_context_stop(client->iso_context);
 994 }
 995
 996 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 997 {
 998         struct fw_cdev_get_cycle_timer *request = buffer;
 999         struct fw_card *card = client->device->card;
1000         unsigned long long bus_time;
1001         struct timeval tv;
1002         unsigned long flags;
1003
1004         preempt_disable();
1005         local_irq_save(flags);
1006
1007         bus_time = card->driver->get_bus_time(card);
1008         do_gettimeofday(&tv);
1009
1010         local_irq_restore(flags);
1011         preempt_enable();
1012
1013         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1014         request->cycle_timer = bus_time & 0xffffffff;
1015         return 0;
1016 }
1017
1018 static void iso_resource_work(struct work_struct *work)
1019 {
1020         struct iso_resource_event *e;
1021         struct iso_resource *r =
1022                         container_of(work, struct iso_resource, work.work);
1023         struct client *client = r->client;
1024         int generation, channel, bandwidth, todo;
1025         bool skip, free, success;
1026
1027         spin_lock_irq(&client->lock);
1028         generation = client->device->generation;
1029         todo = r->todo;
1030         /* Allow 1000ms grace period for other reallocations. */
1031         if (todo == ISO_RES_ALLOC &&
1032             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1033                 if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
1034                         client_get(client);
1035                 skip = true;
1036         } else {
1037                 /* We could be called twice within the same generation. */
1038                 skip = todo == ISO_RES_REALLOC &&
1039                        r->generation == generation;
1040         }
1041         free = todo == ISO_RES_DEALLOC ||
1042                todo == ISO_RES_ALLOC_ONCE ||
1043                todo == ISO_RES_DEALLOC_ONCE;
1044         r->generation = generation;
1045         spin_unlock_irq(&client->lock);
1046
1047         if (skip)
1048                 goto out;
1049
1050         bandwidth = r->bandwidth;
1051
1052         fw_iso_resource_manage(client->device->card, generation,
1053                         r->channels, &channel, &bandwidth,
1054                         todo == ISO_RES_ALLOC ||
1055                         todo == ISO_RES_REALLOC ||
1056                         todo == ISO_RES_ALLOC_ONCE);
1057         /*
1058          * Is this generation outdated already?  As long as this resource sticks
1059          * in the idr, it will be scheduled again for a newer generation or at
1060          * shutdown.
1061          */
1062         if (channel == -EAGAIN &&
1063             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1064                 goto out;
1065
1066         success = channel >= 0 || bandwidth > 0;
1067
1068         spin_lock_irq(&client->lock);
1069         /*
1070          * Transit from allocation to reallocation, except if the client
1071          * requested deallocation in the meantime.
1072          */
1073         if (r->todo == ISO_RES_ALLOC)
1074                 r->todo = ISO_RES_REALLOC;
1075         /*
1076          * Allocation or reallocation failure?  Pull this resource out of the
1077          * idr and prepare for deletion, unless the client is shutting down.
1078          */
1079         if (r->todo == ISO_RES_REALLOC && !success &&
1080             !client->in_shutdown &&
1081             idr_find(&client->resource_idr, r->resource.handle)) {
1082                 idr_remove(&client->resource_idr, r->resource.handle);
1083                 client_put(client);
1084                 free = true;
1085         }
1086         spin_unlock_irq(&client->lock);
1087
1088         if (todo == ISO_RES_ALLOC && channel >= 0)
1089                 r->channels = 1ULL << (63 - channel);
1090
1091         if (todo == ISO_RES_REALLOC && success)
1092                 goto out;
1093
1094         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1095                 e = r->e_alloc;
1096                 r->e_alloc = NULL;
1097         } else {
1098                 e = r->e_dealloc;
1099                 r->e_dealloc = NULL;
1100         }
1101         e->resource.handle      = r->resource.handle;
1102         e->resource.channel     = channel;
1103         e->resource.bandwidth   = bandwidth;
1104
1105         queue_event(client, &e->event,
1106                     &e->resource, sizeof(e->resource), NULL, 0);
1107
1108         if (free) {
1109                 cancel_delayed_work(&r->work);
1110                 kfree(r->e_alloc);
1111                 kfree(r->e_dealloc);
1112                 kfree(r);
1113         }
1114  out:
1115         client_put(client);
1116 }
1117
1118 static int schedule_iso_resource(struct iso_resource *r)
1119 {
1120         int scheduled;
1121
1122         client_get(r->client);
1123
1124         scheduled = schedule_delayed_work(&r->work, 0);
1125         if (!scheduled)
1126                 client_put(r->client);
1127
1128         return scheduled;
1129 }
1130
1131 static void release_iso_resource(struct client *client,
1132                                  struct client_resource *resource)
1133 {
1134         struct iso_resource *r =
1135                 container_of(resource, struct iso_resource, resource);
1136
1137         spin_lock_irq(&client->lock);
1138         r->todo = ISO_RES_DEALLOC;
1139         schedule_iso_resource(r);
1140         spin_unlock_irq(&client->lock);
1141 }
1142
1143 static int init_iso_resource(struct client *client,
1144                 struct fw_cdev_allocate_iso_resource *request, int todo)
1145 {
1146         struct iso_resource_event *e1, *e2;
1147         struct iso_resource *r;
1148         int ret;
1149
1150         if ((request->channels == 0 && request->bandwidth == 0) ||
1151             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1152             request->bandwidth < 0)
1153                 return -EINVAL;
1154
1155         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1156         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1157         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1158         if (r == NULL || e1 == NULL || e2 == NULL) {
1159                 ret = -ENOMEM;
1160                 goto fail;
1161         }
1162
1163         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1164         r->client       = client;
1165         r->todo         = todo;
1166         r->generation   = -1;
1167         r->channels     = request->channels;
1168         r->bandwidth    = request->bandwidth;
1169         r->e_alloc      = e1;
1170         r->e_dealloc    = e2;
1171
1172         e1->resource.closure    = request->closure;
1173         e1->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1174         e2->resource.closure    = request->closure;
1175         e2->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1176
1177         if (todo == ISO_RES_ALLOC) {
1178                 r->resource.release = release_iso_resource;
1179                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1180         } else {
1181                 r->resource.release = NULL;
1182                 r->resource.handle = -1;
1183                 ret = schedule_iso_resource(r) ? 0 : -ENOMEM;
1184         }
1185         if (ret < 0)
1186                 goto fail;
1187         request->handle = r->resource.handle;
1188
1189         return 0;
1190  fail:
1191         kfree(r);
1192         kfree(e1);
1193         kfree(e2);
1194
1195         return ret;
1196 }
1197
1198 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1199 {
1200         struct fw_cdev_allocate_iso_resource *request = buffer;
1201
1202         return init_iso_resource(client, request, ISO_RES_ALLOC);
1203 }
1204
1205 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1206 {
1207         struct fw_cdev_deallocate *request = buffer;
1208
1209         return release_client_resource(client, request->handle,
1210                                        release_iso_resource, NULL);
1211 }
1212
1213 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1214 {
1215         struct fw_cdev_allocate_iso_resource *request = buffer;
1216
1217         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1218 }
1219
1220 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1221 {
1222         struct fw_cdev_allocate_iso_resource *request = buffer;
1223
1224         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1225 }
1226
1227 static int ioctl_get_speed(struct client *client, void *buffer)
1228 {
1229         struct fw_cdev_get_speed *request = buffer;
1230
1231         request->max_speed = client->device->max_speed;
1232
1233         return 0;
1234 }
1235
1236 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1237 {
1238         struct fw_cdev_send_request *request = buffer;
1239
1240         switch (request->tcode) {
1241         case TCODE_WRITE_QUADLET_REQUEST:
1242         case TCODE_WRITE_BLOCK_REQUEST:
1243                 break;
1244         default:
1245                 return -EINVAL;
1246         }
1247
1248         /* Security policy: Only allow accesses to Units Space. */
1249         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1250                 return -EACCES;
1251
1252         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1253 }
1254
1255 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1256         ioctl_get_info,
1257         ioctl_send_request,
1258         ioctl_allocate,
1259         ioctl_deallocate,
1260         ioctl_send_response,
1261         ioctl_initiate_bus_reset,
1262         ioctl_add_descriptor,
1263         ioctl_remove_descriptor,
1264         ioctl_create_iso_context,
1265         ioctl_queue_iso,
1266         ioctl_start_iso,
1267         ioctl_stop_iso,
1268         ioctl_get_cycle_timer,
1269         ioctl_allocate_iso_resource,
1270         ioctl_deallocate_iso_resource,
1271         ioctl_allocate_iso_resource_once,
1272         ioctl_deallocate_iso_resource_once,
1273         ioctl_get_speed,
1274         ioctl_send_broadcast_request,
1275 };
1276
1277 static int dispatch_ioctl(struct client *client,
1278                           unsigned int cmd, void __user *arg)
1279 {
1280         char buffer[256];
1281         int ret;
1282
1283         if (_IOC_TYPE(cmd) != '#' ||
1284             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1285                 return -EINVAL;
1286
1287         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1288                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1289                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1290                         return -EFAULT;
1291         }
1292
1293         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1294         if (ret < 0)
1295                 return ret;
1296
1297         if (_IOC_DIR(cmd) & _IOC_READ) {
1298                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1299                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1300                         return -EFAULT;
1301         }
1302
1303         return ret;
1304 }
1305
1306 static long fw_device_op_ioctl(struct file *file,
1307                                unsigned int cmd, unsigned long arg)
1308 {
1309         struct client *client = file->private_data;
1310
1311         if (fw_device_is_shutdown(client->device))
1312                 return -ENODEV;
1313
1314         return dispatch_ioctl(client, cmd, (void __user *) arg);
1315 }
1316
1317 #ifdef CONFIG_COMPAT
1318 static long fw_device_op_compat_ioctl(struct file *file,
1319                                       unsigned int cmd, unsigned long arg)
1320 {
1321         struct client *client = file->private_data;
1322
1323         if (fw_device_is_shutdown(client->device))
1324                 return -ENODEV;
1325
1326         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1327 }
1328 #endif
1329
1330 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1331 {
1332         struct client *client = file->private_data;
1333         enum dma_data_direction direction;
1334         unsigned long size;
1335         int page_count, ret;
1336
1337         if (fw_device_is_shutdown(client->device))
1338                 return -ENODEV;
1339
1340         /* FIXME: We could support multiple buffers, but we don't. */
1341         if (client->buffer.pages != NULL)
1342                 return -EBUSY;
1343
1344         if (!(vma->vm_flags & VM_SHARED))
1345                 return -EINVAL;
1346
1347         if (vma->vm_start & ~PAGE_MASK)
1348                 return -EINVAL;
1349
1350         client->vm_start = vma->vm_start;
1351         size = vma->vm_end - vma->vm_start;
1352         page_count = size >> PAGE_SHIFT;
1353         if (size & ~PAGE_MASK)
1354                 return -EINVAL;
1355
1356         if (vma->vm_flags & VM_WRITE)
1357                 direction = DMA_TO_DEVICE;
1358         else
1359                 direction = DMA_FROM_DEVICE;
1360
1361         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1362                                  page_count, direction);
1363         if (ret < 0)
1364                 return ret;
1365
1366         ret = fw_iso_buffer_map(&client->buffer, vma);
1367         if (ret < 0)
1368                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1369
1370         return ret;
1371 }
1372
1373 static int shutdown_resource(int id, void *p, void *data)
1374 {
1375         struct client_resource *r = p;
1376         struct client *client = data;
1377
1378         r->release(client, r);
1379         client_put(client);
1380
1381         return 0;
1382 }
1383
1384 static int fw_device_op_release(struct inode *inode, struct file *file)
1385 {
1386         struct client *client = file->private_data;
1387         struct event *e, *next_e;
1388         unsigned long flags;
1389
1390         mutex_lock(&client->device->client_list_mutex);
1391         list_del(&client->link);
1392         mutex_unlock(&client->device->client_list_mutex);
1393
1394         if (client->buffer.pages)
1395                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1396
1397         if (client->iso_context)
1398                 fw_iso_context_destroy(client->iso_context);
1399
1400         /* Freeze client->resource_idr and client->event_list */
1401         spin_lock_irqsave(&client->lock, flags);
1402         client->in_shutdown = true;
1403         spin_unlock_irqrestore(&client->lock, flags);
1404
1405         idr_for_each(&client->resource_idr, shutdown_resource, client);
1406         idr_remove_all(&client->resource_idr);
1407         idr_destroy(&client->resource_idr);
1408
1409         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1410                 kfree(e);
1411
1412         client_put(client);
1413
1414         return 0;
1415 }
1416
1417 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1418 {
1419         struct client *client = file->private_data;
1420         unsigned int mask = 0;
1421
1422         poll_wait(file, &client->wait, pt);
1423
1424         if (fw_device_is_shutdown(client->device))
1425                 mask |= POLLHUP | POLLERR;
1426         if (!list_empty(&client->event_list))
1427                 mask |= POLLIN | POLLRDNORM;
1428
1429         return mask;
1430 }
1431
1432 const struct file_operations fw_device_ops = {
1433         .owner          = THIS_MODULE,
1434         .open           = fw_device_op_open,
1435         .read           = fw_device_op_read,
1436         .unlocked_ioctl = fw_device_op_ioctl,
1437         .poll           = fw_device_op_poll,
1438         .release        = fw_device_op_release,
1439         .mmap           = fw_device_op_mmap,
1440
1441 #ifdef CONFIG_COMPAT
1442         .compat_ioctl   = fw_device_op_compat_ioctl,
1443 #endif
1444 };