git.oblomov.eu Git - linux-2.6/blob - drivers/firewire/core-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.h>
  26 #include <linux/firewire-cdev.h>
  27 #include <linux/idr.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/kernel.h>
  30 #include <linux/kref.h>
  31 #include <linux/mm.h>
  32 #include <linux/module.h>
  33 #include <linux/mutex.h>
  34 #include <linux/poll.h>
  35 #include <linux/preempt.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/time.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/wait.h>
  41 #include <linux/workqueue.h>
  42
  43 #include <asm/system.h>
  44
  45 #include "core.h"
  46
  47 struct client {
  48         u32 version;
  49         struct fw_device *device;
  50
  51         spinlock_t lock;
  52         bool in_shutdown;
  53         struct idr resource_idr;
  54         struct list_head event_list;
  55         wait_queue_head_t wait;
  56         u64 bus_reset_closure;
  57
  58         struct fw_iso_context *iso_context;
  59         u64 iso_closure;
  60         struct fw_iso_buffer buffer;
  61         unsigned long vm_start;
  62
  63         struct list_head link;
  64         struct kref kref;
  65 };
  66
  67 static inline void client_get(struct client *client)
  68 {
  69         kref_get(&client->kref);
  70 }
  71
  72 static void client_release(struct kref *kref)
  73 {
  74         struct client *client = container_of(kref, struct client, kref);
  75
  76         fw_device_put(client->device);
  77         kfree(client);
  78 }
  79
  80 static void client_put(struct client *client)
  81 {
  82         kref_put(&client->kref, client_release);
  83 }
  84
  85 struct client_resource;
  86 typedef void (*client_resource_release_fn_t)(struct client *,
  87                                              struct client_resource *);
  88 struct client_resource {
  89         client_resource_release_fn_t release;
  90         int handle;
  91 };
  92
  93 struct address_handler_resource {
  94         struct client_resource resource;
  95         struct fw_address_handler handler;
  96         __u64 closure;
  97         struct client *client;
  98 };
  99
 100 struct outbound_transaction_resource {
 101         struct client_resource resource;
 102         struct fw_transaction transaction;
 103 };
 104
 105 struct inbound_transaction_resource {
 106         struct client_resource resource;
 107         struct fw_request *request;
 108         void *data;
 109         size_t length;
 110 };
 111
 112 struct descriptor_resource {
 113         struct client_resource resource;
 114         struct fw_descriptor descriptor;
 115         u32 data[0];
 116 };
 117
 118 struct iso_resource {
 119         struct client_resource resource;
 120         struct client *client;
 121         /* Schedule work and access todo only with client->lock held. */
 122         struct delayed_work work;
 123         enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
 124               ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
 125         int generation;
 126         u64 channels;
 127         s32 bandwidth;
 128         struct iso_resource_event *e_alloc, *e_dealloc;
 129 };
 130
 131 static void schedule_iso_resource(struct iso_resource *);
 132 static void release_iso_resource(struct client *, struct client_resource *);
 133
 134 /*
 135  * dequeue_event() just kfree()'s the event, so the event has to be
 136  * the first field in a struct XYZ_event.
 137  */
 138 struct event {
 139         struct { void *data; size_t size; } v[2];
 140         struct list_head link;
 141 };
 142
 143 struct bus_reset_event {
 144         struct event event;
 145         struct fw_cdev_event_bus_reset reset;
 146 };
 147
 148 struct outbound_transaction_event {
 149         struct event event;
 150         struct client *client;
 151         struct outbound_transaction_resource r;
 152         struct fw_cdev_event_response response;
 153 };
 154
 155 struct inbound_transaction_event {
 156         struct event event;
 157         struct fw_cdev_event_request request;
 158 };
 159
 160 struct iso_interrupt_event {
 161         struct event event;
 162         struct fw_cdev_event_iso_interrupt interrupt;
 163 };
 164
 165 struct iso_resource_event {
 166         struct event event;
 167         struct fw_cdev_event_iso_resource resource;
 168 };
 169
 170 static inline void __user *u64_to_uptr(__u64 value)
 171 {
 172         return (void __user *)(unsigned long)value;
 173 }
 174
 175 static inline __u64 uptr_to_u64(void __user *ptr)
 176 {
 177         return (__u64)(unsigned long)ptr;
 178 }
 179
 180 static int fw_device_op_open(struct inode *inode, struct file *file)
 181 {
 182         struct fw_device *device;
 183         struct client *client;
 184
 185         device = fw_device_get_by_devt(inode->i_rdev);
 186         if (device == NULL)
 187                 return -ENODEV;
 188
 189         if (fw_device_is_shutdown(device)) {
 190                 fw_device_put(device);
 191                 return -ENODEV;
 192         }
 193
 194         client = kzalloc(sizeof(*client), GFP_KERNEL);
 195         if (client == NULL) {
 196                 fw_device_put(device);
 197                 return -ENOMEM;
 198         }
 199
 200         client->device = device;
 201         spin_lock_init(&client->lock);
 202         idr_init(&client->resource_idr);
 203         INIT_LIST_HEAD(&client->event_list);
 204         init_waitqueue_head(&client->wait);
 205         kref_init(&client->kref);
 206
 207         file->private_data = client;
 208
 209         mutex_lock(&device->client_list_mutex);
 210         list_add_tail(&client->link, &device->client_list);
 211         mutex_unlock(&device->client_list_mutex);
 212
 213         return 0;
 214 }
 215
 216 static void queue_event(struct client *client, struct event *event,
 217                         void *data0, size_t size0, void *data1, size_t size1)
 218 {
 219         unsigned long flags;
 220
 221         event->v[0].data = data0;
 222         event->v[0].size = size0;
 223         event->v[1].data = data1;
 224         event->v[1].size = size1;
 225
 226         spin_lock_irqsave(&client->lock, flags);
 227         if (client->in_shutdown)
 228                 kfree(event);
 229         else
 230                 list_add_tail(&event->link, &client->event_list);
 231         spin_unlock_irqrestore(&client->lock, flags);
 232
 233         wake_up_interruptible(&client->wait);
 234 }
 235
 236 static int dequeue_event(struct client *client,
 237                          char __user *buffer, size_t count)
 238 {
 239         struct event *event;
 240         size_t size, total;
 241         int i, ret;
 242
 243         ret = wait_event_interruptible(client->wait,
 244                         !list_empty(&client->event_list) ||
 245                         fw_device_is_shutdown(client->device));
 246         if (ret < 0)
 247                 return ret;
 248
 249         if (list_empty(&client->event_list) &&
 250                        fw_device_is_shutdown(client->device))
 251                 return -ENODEV;
 252
 253         spin_lock_irq(&client->lock);
 254         event = list_first_entry(&client->event_list, struct event, link);
 255         list_del(&event->link);
 256         spin_unlock_irq(&client->lock);
 257
 258         total = 0;
 259         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 260                 size = min(event->v[i].size, count - total);
 261                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 262                         ret = -EFAULT;
 263                         goto out;
 264                 }
 265                 total += size;
 266         }
 267         ret = total;
 268
 269  out:
 270         kfree(event);
 271
 272         return ret;
 273 }
 274
 275 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 276                                  size_t count, loff_t *offset)
 277 {
 278         struct client *client = file->private_data;
 279
 280         return dequeue_event(client, buffer, count);
 281 }
 282
 283 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 284                                  struct client *client)
 285 {
 286         struct fw_card *card = client->device->card;
 287
 288         spin_lock_irq(&card->lock);
 289
 290         event->closure       = client->bus_reset_closure;
 291         event->type          = FW_CDEV_EVENT_BUS_RESET;
 292         event->generation    = client->device->generation;
 293         event->node_id       = client->device->node_id;
 294         event->local_node_id = card->local_node->node_id;
 295         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 296         event->irm_node_id   = card->irm_node->node_id;
 297         event->root_node_id  = card->root_node->node_id;
 298
 299         spin_unlock_irq(&card->lock);
 300 }
 301
 302 static void for_each_client(struct fw_device *device,
 303                             void (*callback)(struct client *client))
 304 {
 305         struct client *c;
 306
 307         mutex_lock(&device->client_list_mutex);
 308         list_for_each_entry(c, &device->client_list, link)
 309                 callback(c);
 310         mutex_unlock(&device->client_list_mutex);
 311 }
 312
 313 static int schedule_reallocations(int id, void *p, void *data)
 314 {
 315         struct client_resource *r = p;
 316
 317         if (r->release == release_iso_resource)
 318                 schedule_iso_resource(container_of(r,
 319                                         struct iso_resource, resource));
 320         return 0;
 321 }
 322
 323 static void queue_bus_reset_event(struct client *client)
 324 {
 325         struct bus_reset_event *e;
 326
 327         e = kzalloc(sizeof(*e), GFP_KERNEL);
 328         if (e == NULL) {
 329                 fw_notify("Out of memory when allocating bus reset event\n");
 330                 return;
 331         }
 332
 333         fill_bus_reset_event(&e->reset, client);
 334
 335         queue_event(client, &e->event,
 336                     &e->reset, sizeof(e->reset), NULL, 0);
 337
 338         spin_lock_irq(&client->lock);
 339         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 340         spin_unlock_irq(&client->lock);
 341 }
 342
 343 void fw_device_cdev_update(struct fw_device *device)
 344 {
 345         for_each_client(device, queue_bus_reset_event);
 346 }
 347
 348 static void wake_up_client(struct client *client)
 349 {
 350         wake_up_interruptible(&client->wait);
 351 }
 352
 353 void fw_device_cdev_remove(struct fw_device *device)
 354 {
 355         for_each_client(device, wake_up_client);
 356 }
 357
 358 static int ioctl_get_info(struct client *client, void *buffer)
 359 {
 360         struct fw_cdev_get_info *get_info = buffer;
 361         struct fw_cdev_event_bus_reset bus_reset;
 362         unsigned long ret = 0;
 363
 364         client->version = get_info->version;
 365         get_info->version = FW_CDEV_VERSION;
 366         get_info->card = client->device->card->index;
 367
 368         down_read(&fw_device_rwsem);
 369
 370         if (get_info->rom != 0) {
 371                 void __user *uptr = u64_to_uptr(get_info->rom);
 372                 size_t want = get_info->rom_length;
 373                 size_t have = client->device->config_rom_length * 4;
 374
 375                 ret = copy_to_user(uptr, client->device->config_rom,
 376                                    min(want, have));
 377         }
 378         get_info->rom_length = client->device->config_rom_length * 4;
 379
 380         up_read(&fw_device_rwsem);
 381
 382         if (ret != 0)
 383                 return -EFAULT;
 384
 385         client->bus_reset_closure = get_info->bus_reset_closure;
 386         if (get_info->bus_reset != 0) {
 387                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 388
 389                 fill_bus_reset_event(&bus_reset, client);
 390                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 391                         return -EFAULT;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int add_client_resource(struct client *client,
 398                                struct client_resource *resource, gfp_t gfp_mask)
 399 {
 400         unsigned long flags;
 401         int ret;
 402
 403  retry:
 404         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 405                 return -ENOMEM;
 406
 407         spin_lock_irqsave(&client->lock, flags);
 408         if (client->in_shutdown)
 409                 ret = -ECANCELED;
 410         else
 411                 ret = idr_get_new(&client->resource_idr, resource,
 412                                   &resource->handle);
 413         if (ret >= 0) {
 414                 client_get(client);
 415                 if (resource->release == release_iso_resource)
 416                         schedule_iso_resource(container_of(resource,
 417                                                 struct iso_resource, resource));
 418         }
 419         spin_unlock_irqrestore(&client->lock, flags);
 420
 421         if (ret == -EAGAIN)
 422                 goto retry;
 423
 424         return ret < 0 ? ret : 0;
 425 }
 426
 427 static int release_client_resource(struct client *client, u32 handle,
 428                                    client_resource_release_fn_t release,
 429                                    struct client_resource **resource)
 430 {
 431         struct client_resource *r;
 432
 433         spin_lock_irq(&client->lock);
 434         if (client->in_shutdown)
 435                 r = NULL;
 436         else
 437                 r = idr_find(&client->resource_idr, handle);
 438         if (r && r->release == release)
 439                 idr_remove(&client->resource_idr, handle);
 440         spin_unlock_irq(&client->lock);
 441
 442         if (!(r && r->release == release))
 443                 return -EINVAL;
 444
 445         if (resource)
 446                 *resource = r;
 447         else
 448                 r->release(client, r);
 449
 450         client_put(client);
 451
 452         return 0;
 453 }
 454
 455 static void release_transaction(struct client *client,
 456                                 struct client_resource *resource)
 457 {
 458         struct outbound_transaction_resource *r = container_of(resource,
 459                         struct outbound_transaction_resource, resource);
 460
 461         fw_cancel_transaction(client->device->card, &r->transaction);
 462 }
 463
 464 static void complete_transaction(struct fw_card *card, int rcode,
 465                                  void *payload, size_t length, void *data)
 466 {
 467         struct outbound_transaction_event *e = data;
 468         struct fw_cdev_event_response *rsp = &e->response;
 469         struct client *client = e->client;
 470         unsigned long flags;
 471
 472         if (length < rsp->length)
 473                 rsp->length = length;
 474         if (rcode == RCODE_COMPLETE)
 475                 memcpy(rsp->data, payload, rsp->length);
 476
 477         spin_lock_irqsave(&client->lock, flags);
 478         /*
 479          * 1. If called while in shutdown, the idr tree must be left untouched.
 480          *    The idr handle will be removed and the client reference will be
 481          *    dropped later.
 482          * 2. If the call chain was release_client_resource ->
 483          *    release_transaction -> complete_transaction (instead of a normal
 484          *    conclusion of the transaction), i.e. if this resource was already
 485          *    unregistered from the idr, the client reference will be dropped
 486          *    by release_client_resource and we must not drop it here.
 487          */
 488         if (!client->in_shutdown &&
 489             idr_find(&client->resource_idr, e->r.resource.handle)) {
 490                 idr_remove(&client->resource_idr, e->r.resource.handle);
 491                 /* Drop the idr's reference */
 492                 client_put(client);
 493         }
 494         spin_unlock_irqrestore(&client->lock, flags);
 495
 496         rsp->type = FW_CDEV_EVENT_RESPONSE;
 497         rsp->rcode = rcode;
 498
 499         /*
 500          * In the case that sizeof(*rsp) doesn't align with the position of the
 501          * data, and the read is short, preserve an extra copy of the data
 502          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 503          * for short reads and some apps depended on it, this is both safe
 504          * and prudent for compatibility.
 505          */
 506         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 507                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 508                             rsp->data, rsp->length);
 509         else
 510                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 511                             NULL, 0);
 512
 513         /* Drop the transaction callback's reference */
 514         client_put(client);
 515 }
 516
 517 static int init_request(struct client *client,
 518                         struct fw_cdev_send_request *request,
 519                         int destination_id, int speed)
 520 {
 521         struct outbound_transaction_event *e;
 522         int ret;
 523
 524         if (request->tcode != TCODE_STREAM_DATA &&
 525             (request->length > 4096 || request->length > 512 << speed))
 526                 return -EIO;
 527
 528         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 529         if (e == NULL)
 530                 return -ENOMEM;
 531
 532         e->client = client;
 533         e->response.length = request->length;
 534         e->response.closure = request->closure;
 535
 536         if (request->data &&
 537             copy_from_user(e->response.data,
 538                            u64_to_uptr(request->data), request->length)) {
 539                 ret = -EFAULT;
 540                 goto failed;
 541         }
 542
 543         e->r.resource.release = release_transaction;
 544         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 545         if (ret < 0)
 546                 goto failed;
 547
 548         /* Get a reference for the transaction callback */
 549         client_get(client);
 550
 551         fw_send_request(client->device->card, &e->r.transaction,
 552                         request->tcode, destination_id, request->generation,
 553                         speed, request->offset, e->response.data,
 554                         request->length, complete_transaction, e);
 555         return 0;
 556
 557  failed:
 558         kfree(e);
 559
 560         return ret;
 561 }
 562
 563 static int ioctl_send_request(struct client *client, void *buffer)
 564 {
 565         struct fw_cdev_send_request *request = buffer;
 566
 567         switch (request->tcode) {
 568         case TCODE_WRITE_QUADLET_REQUEST:
 569         case TCODE_WRITE_BLOCK_REQUEST:
 570         case TCODE_READ_QUADLET_REQUEST:
 571         case TCODE_READ_BLOCK_REQUEST:
 572         case TCODE_LOCK_MASK_SWAP:
 573         case TCODE_LOCK_COMPARE_SWAP:
 574         case TCODE_LOCK_FETCH_ADD:
 575         case TCODE_LOCK_LITTLE_ADD:
 576         case TCODE_LOCK_BOUNDED_ADD:
 577         case TCODE_LOCK_WRAP_ADD:
 578         case TCODE_LOCK_VENDOR_DEPENDENT:
 579                 break;
 580         default:
 581                 return -EINVAL;
 582         }
 583
 584         return init_request(client, request, client->device->node_id,
 585                             client->device->max_speed);
 586 }
 587
 588 static void release_request(struct client *client,
 589                             struct client_resource *resource)
 590 {
 591         struct inbound_transaction_resource *r = container_of(resource,
 592                         struct inbound_transaction_resource, resource);
 593
 594         fw_send_response(client->device->card, r->request,
 595                          RCODE_CONFLICT_ERROR);
 596         kfree(r);
 597 }
 598
 599 static void handle_request(struct fw_card *card, struct fw_request *request,
 600                            int tcode, int destination, int source,
 601                            int generation, int speed,
 602                            unsigned long long offset,
 603                            void *payload, size_t length, void *callback_data)
 604 {
 605         struct address_handler_resource *handler = callback_data;
 606         struct inbound_transaction_resource *r;
 607         struct inbound_transaction_event *e;
 608         int ret;
 609
 610         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 611         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 612         if (r == NULL || e == NULL)
 613                 goto failed;
 614
 615         r->request = request;
 616         r->data    = payload;
 617         r->length  = length;
 618
 619         r->resource.release = release_request;
 620         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 621         if (ret < 0)
 622                 goto failed;
 623
 624         e->request.type    = FW_CDEV_EVENT_REQUEST;
 625         e->request.tcode   = tcode;
 626         e->request.offset  = offset;
 627         e->request.length  = length;
 628         e->request.handle  = r->resource.handle;
 629         e->request.closure = handler->closure;
 630
 631         queue_event(handler->client, &e->event,
 632                     &e->request, sizeof(e->request), payload, length);
 633         return;
 634
 635  failed:
 636         kfree(r);
 637         kfree(e);
 638         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 639 }
 640
 641 static void release_address_handler(struct client *client,
 642                                     struct client_resource *resource)
 643 {
 644         struct address_handler_resource *r =
 645             container_of(resource, struct address_handler_resource, resource);
 646
 647         fw_core_remove_address_handler(&r->handler);
 648         kfree(r);
 649 }
 650
 651 static int ioctl_allocate(struct client *client, void *buffer)
 652 {
 653         struct fw_cdev_allocate *request = buffer;
 654         struct address_handler_resource *r;
 655         struct fw_address_region region;
 656         int ret;
 657
 658         r = kmalloc(sizeof(*r), GFP_KERNEL);
 659         if (r == NULL)
 660                 return -ENOMEM;
 661
 662         region.start = request->offset;
 663         region.end = request->offset + request->length;
 664         r->handler.length = request->length;
 665         r->handler.address_callback = handle_request;
 666         r->handler.callback_data = r;
 667         r->closure = request->closure;
 668         r->client = client;
 669
 670         ret = fw_core_add_address_handler(&r->handler, &region);
 671         if (ret < 0) {
 672                 kfree(r);
 673                 return ret;
 674         }
 675
 676         r->resource.release = release_address_handler;
 677         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 678         if (ret < 0) {
 679                 release_address_handler(client, &r->resource);
 680                 return ret;
 681         }
 682         request->handle = r->resource.handle;
 683
 684         return 0;
 685 }
 686
 687 static int ioctl_deallocate(struct client *client, void *buffer)
 688 {
 689         struct fw_cdev_deallocate *request = buffer;
 690
 691         return release_client_resource(client, request->handle,
 692                                        release_address_handler, NULL);
 693 }
 694
 695 static int ioctl_send_response(struct client *client, void *buffer)
 696 {
 697         struct fw_cdev_send_response *request = buffer;
 698         struct client_resource *resource;
 699         struct inbound_transaction_resource *r;
 700
 701         if (release_client_resource(client, request->handle,
 702                                     release_request, &resource) < 0)
 703                 return -EINVAL;
 704
 705         r = container_of(resource, struct inbound_transaction_resource,
 706                          resource);
 707         if (request->length < r->length)
 708                 r->length = request->length;
 709         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 710                 return -EFAULT;
 711
 712         fw_send_response(client->device->card, r->request, request->rcode);
 713         kfree(r);
 714
 715         return 0;
 716 }
 717
 718 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 719 {
 720         struct fw_cdev_initiate_bus_reset *request = buffer;
 721         int short_reset;
 722
 723         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 724
 725         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 726 }
 727
 728 static void release_descriptor(struct client *client,
 729                                struct client_resource *resource)
 730 {
 731         struct descriptor_resource *r =
 732                 container_of(resource, struct descriptor_resource, resource);
 733
 734         fw_core_remove_descriptor(&r->descriptor);
 735         kfree(r);
 736 }
 737
 738 static int ioctl_add_descriptor(struct client *client, void *buffer)
 739 {
 740         struct fw_cdev_add_descriptor *request = buffer;
 741         struct descriptor_resource *r;
 742         int ret;
 743
 744         /* Access policy: Allow this ioctl only on local nodes' device files. */
 745         if (!client->device->is_local)
 746                 return -ENOSYS;
 747
 748         if (request->length > 256)
 749                 return -EINVAL;
 750
 751         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 752         if (r == NULL)
 753                 return -ENOMEM;
 754
 755         if (copy_from_user(r->data,
 756                            u64_to_uptr(request->data), request->length * 4)) {
 757                 ret = -EFAULT;
 758                 goto failed;
 759         }
 760
 761         r->descriptor.length    = request->length;
 762         r->descriptor.immediate = request->immediate;
 763         r->descriptor.key       = request->key;
 764         r->descriptor.data      = r->data;
 765
 766         ret = fw_core_add_descriptor(&r->descriptor);
 767         if (ret < 0)
 768                 goto failed;
 769
 770         r->resource.release = release_descriptor;
 771         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 772         if (ret < 0) {
 773                 fw_core_remove_descriptor(&r->descriptor);
 774                 goto failed;
 775         }
 776         request->handle = r->resource.handle;
 777
 778         return 0;
 779  failed:
 780         kfree(r);
 781
 782         return ret;
 783 }
 784
 785 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 786 {
 787         struct fw_cdev_remove_descriptor *request = buffer;
 788
 789         return release_client_resource(client, request->handle,
 790                                        release_descriptor, NULL);
 791 }
 792
 793 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 794                          size_t header_length, void *header, void *data)
 795 {
 796         struct client *client = data;
 797         struct iso_interrupt_event *e;
 798
 799         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 800         if (e == NULL)
 801                 return;
 802
 803         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 804         e->interrupt.closure   = client->iso_closure;
 805         e->interrupt.cycle     = cycle;
 806         e->interrupt.header_length = header_length;
 807         memcpy(e->interrupt.header, header, header_length);
 808         queue_event(client, &e->event, &e->interrupt,
 809                     sizeof(e->interrupt) + header_length, NULL, 0);
 810 }
 811
 812 static int ioctl_create_iso_context(struct client *client, void *buffer)
 813 {
 814         struct fw_cdev_create_iso_context *request = buffer;
 815         struct fw_iso_context *context;
 816
 817         /* We only support one context at this time. */
 818         if (client->iso_context != NULL)
 819                 return -EBUSY;
 820
 821         if (request->channel > 63)
 822                 return -EINVAL;
 823
 824         switch (request->type) {
 825         case FW_ISO_CONTEXT_RECEIVE:
 826                 if (request->header_size < 4 || (request->header_size & 3))
 827                         return -EINVAL;
 828
 829                 break;
 830
 831         case FW_ISO_CONTEXT_TRANSMIT:
 832                 if (request->speed > SCODE_3200)
 833                         return -EINVAL;
 834
 835                 break;
 836
 837         default:
 838                 return -EINVAL;
 839         }
 840
 841         context =  fw_iso_context_create(client->device->card,
 842                                          request->type,
 843                                          request->channel,
 844                                          request->speed,
 845                                          request->header_size,
 846                                          iso_callback, client);
 847         if (IS_ERR(context))
 848                 return PTR_ERR(context);
 849
 850         client->iso_closure = request->closure;
 851         client->iso_context = context;
 852
 853         /* We only support one context at this time. */
 854         request->handle = 0;
 855
 856         return 0;
 857 }
 858
 859 /* Macros for decoding the iso packet control header. */
 860 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 861 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 862 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 863 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 864 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 865 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 866
 867 static int ioctl_queue_iso(struct client *client, void *buffer)
 868 {
 869         struct fw_cdev_queue_iso *request = buffer;
 870         struct fw_cdev_iso_packet __user *p, *end, *next;
 871         struct fw_iso_context *ctx = client->iso_context;
 872         unsigned long payload, buffer_end, header_length;
 873         u32 control;
 874         int count;
 875         struct {
 876                 struct fw_iso_packet packet;
 877                 u8 header[256];
 878         } u;
 879
 880         if (ctx == NULL || request->handle != 0)
 881                 return -EINVAL;
 882
 883         /*
 884          * If the user passes a non-NULL data pointer, has mmap()'ed
 885          * the iso buffer, and the pointer points inside the buffer,
 886          * we setup the payload pointers accordingly.  Otherwise we
 887          * set them both to 0, which will still let packets with
 888          * payload_length == 0 through.  In other words, if no packets
 889          * use the indirect payload, the iso buffer need not be mapped
 890          * and the request->data pointer is ignored.
 891          */
 892
 893         payload = (unsigned long)request->data - client->vm_start;
 894         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 895         if (request->data == 0 || client->buffer.pages == NULL ||
 896             payload >= buffer_end) {
 897                 payload = 0;
 898                 buffer_end = 0;
 899         }
 900
 901         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 902
 903         if (!access_ok(VERIFY_READ, p, request->size))
 904                 return -EFAULT;
 905
 906         end = (void __user *)p + request->size;
 907         count = 0;
 908         while (p < end) {
 909                 if (get_user(control, &p->control))
 910                         return -EFAULT;
 911                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 912                 u.packet.interrupt = GET_INTERRUPT(control);
 913                 u.packet.skip = GET_SKIP(control);
 914                 u.packet.tag = GET_TAG(control);
 915                 u.packet.sy = GET_SY(control);
 916                 u.packet.header_length = GET_HEADER_LENGTH(control);
 917
 918                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 919                         header_length = u.packet.header_length;
 920                 } else {
 921                         /*
 922                          * We require that header_length is a multiple of
 923                          * the fixed header size, ctx->header_size.
 924                          */
 925                         if (ctx->header_size == 0) {
 926                                 if (u.packet.header_length > 0)
 927                                         return -EINVAL;
 928                         } else if (u.packet.header_length % ctx->header_size != 0) {
 929                                 return -EINVAL;
 930                         }
 931                         header_length = 0;
 932                 }
 933
 934                 next = (struct fw_cdev_iso_packet __user *)
 935                         &p->header[header_length / 4];
 936                 if (next > end)
 937                         return -EINVAL;
 938                 if (__copy_from_user
 939                     (u.packet.header, p->header, header_length))
 940                         return -EFAULT;
 941                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 942                     u.packet.header_length + u.packet.payload_length > 0)
 943                         return -EINVAL;
 944                 if (payload + u.packet.payload_length > buffer_end)
 945                         return -EINVAL;
 946
 947                 if (fw_iso_context_queue(ctx, &u.packet,
 948                                          &client->buffer, payload))
 949                         break;
 950
 951                 p = next;
 952                 payload += u.packet.payload_length;
 953                 count++;
 954         }
 955
 956         request->size    -= uptr_to_u64(p) - request->packets;
 957         request->packets  = uptr_to_u64(p);
 958         request->data     = client->vm_start + payload;
 959
 960         return count;
 961 }
 962
 963 static int ioctl_start_iso(struct client *client, void *buffer)
 964 {
 965         struct fw_cdev_start_iso *request = buffer;
 966
 967         if (client->iso_context == NULL || request->handle != 0)
 968                 return -EINVAL;
 969
 970         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 971                 if (request->tags == 0 || request->tags > 15)
 972                         return -EINVAL;
 973
 974                 if (request->sync > 15)
 975                         return -EINVAL;
 976         }
 977
 978         return fw_iso_context_start(client->iso_context, request->cycle,
 979                                     request->sync, request->tags);
 980 }
 981
 982 static int ioctl_stop_iso(struct client *client, void *buffer)
 983 {
 984         struct fw_cdev_stop_iso *request = buffer;
 985
 986         if (client->iso_context == NULL || request->handle != 0)
 987                 return -EINVAL;
 988
 989         return fw_iso_context_stop(client->iso_context);
 990 }
 991
 992 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 993 {
 994         struct fw_cdev_get_cycle_timer *request = buffer;
 995         struct fw_card *card = client->device->card;
 996         unsigned long long bus_time;
 997         struct timeval tv;
 998         unsigned long flags;
 999
1000         preempt_disable();
1001         local_irq_save(flags);
1002
1003         bus_time = card->driver->get_bus_time(card);
1004         do_gettimeofday(&tv);
1005
1006         local_irq_restore(flags);
1007         preempt_enable();
1008
1009         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1010         request->cycle_timer = bus_time & 0xffffffff;
1011         return 0;
1012 }
1013
1014 static void iso_resource_work(struct work_struct *work)
1015 {
1016         struct iso_resource_event *e;
1017         struct iso_resource *r =
1018                         container_of(work, struct iso_resource, work.work);
1019         struct client *client = r->client;
1020         int generation, channel, bandwidth, todo;
1021         bool skip, free, success;
1022
1023         spin_lock_irq(&client->lock);
1024         generation = client->device->generation;
1025         todo = r->todo;
1026         /* Allow 1000ms grace period for other reallocations. */
1027         if (todo == ISO_RES_ALLOC &&
1028             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1029                 if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
1030                         client_get(client);
1031                 skip = true;
1032         } else {
1033                 /* We could be called twice within the same generation. */
1034                 skip = todo == ISO_RES_REALLOC &&
1035                        r->generation == generation;
1036         }
1037         free = todo == ISO_RES_DEALLOC ||
1038                todo == ISO_RES_ALLOC_ONCE ||
1039                todo == ISO_RES_DEALLOC_ONCE;
1040         r->generation = generation;
1041         spin_unlock_irq(&client->lock);
1042
1043         if (skip)
1044                 goto out;
1045
1046         bandwidth = r->bandwidth;
1047
1048         fw_iso_resource_manage(client->device->card, generation,
1049                         r->channels, &channel, &bandwidth,
1050                         todo == ISO_RES_ALLOC ||
1051                         todo == ISO_RES_REALLOC ||
1052                         todo == ISO_RES_ALLOC_ONCE);
1053         /*
1054          * Is this generation outdated already?  As long as this resource sticks
1055          * in the idr, it will be scheduled again for a newer generation or at
1056          * shutdown.
1057          */
1058         if (channel == -EAGAIN &&
1059             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1060                 goto out;
1061
1062         success = channel >= 0 || bandwidth > 0;
1063
1064         spin_lock_irq(&client->lock);
1065         /*
1066          * Transit from allocation to reallocation, except if the client
1067          * requested deallocation in the meantime.
1068          */
1069         if (r->todo == ISO_RES_ALLOC)
1070                 r->todo = ISO_RES_REALLOC;
1071         /*
1072          * Allocation or reallocation failure?  Pull this resource out of the
1073          * idr and prepare for deletion, unless the client is shutting down.
1074          */
1075         if (r->todo == ISO_RES_REALLOC && !success &&
1076             !client->in_shutdown &&
1077             idr_find(&client->resource_idr, r->resource.handle)) {
1078                 idr_remove(&client->resource_idr, r->resource.handle);
1079                 client_put(client);
1080                 free = true;
1081         }
1082         spin_unlock_irq(&client->lock);
1083
1084         if (todo == ISO_RES_ALLOC && channel >= 0)
1085                 r->channels = 1ULL << channel;
1086
1087         if (todo == ISO_RES_REALLOC && success)
1088                 goto out;
1089
1090         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1091                 e = r->e_alloc;
1092                 r->e_alloc = NULL;
1093         } else {
1094                 e = r->e_dealloc;
1095                 r->e_dealloc = NULL;
1096         }
1097         e->resource.handle      = r->resource.handle;
1098         e->resource.channel     = channel;
1099         e->resource.bandwidth   = bandwidth;
1100
1101         queue_event(client, &e->event,
1102                     &e->resource, sizeof(e->resource), NULL, 0);
1103
1104         if (free) {
1105                 cancel_delayed_work(&r->work);
1106                 kfree(r->e_alloc);
1107                 kfree(r->e_dealloc);
1108                 kfree(r);
1109         }
1110  out:
1111         client_put(client);
1112 }
1113
1114 static void schedule_iso_resource(struct iso_resource *r)
1115 {
1116         client_get(r->client);
1117         if (!schedule_delayed_work(&r->work, 0))
1118                 client_put(r->client);
1119 }
1120
1121 static void release_iso_resource(struct client *client,
1122                                  struct client_resource *resource)
1123 {
1124         struct iso_resource *r =
1125                 container_of(resource, struct iso_resource, resource);
1126
1127         spin_lock_irq(&client->lock);
1128         r->todo = ISO_RES_DEALLOC;
1129         schedule_iso_resource(r);
1130         spin_unlock_irq(&client->lock);
1131 }
1132
1133 static int init_iso_resource(struct client *client,
1134                 struct fw_cdev_allocate_iso_resource *request, int todo)
1135 {
1136         struct iso_resource_event *e1, *e2;
1137         struct iso_resource *r;
1138         int ret;
1139
1140         if ((request->channels == 0 && request->bandwidth == 0) ||
1141             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1142             request->bandwidth < 0)
1143                 return -EINVAL;
1144
1145         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1146         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1147         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1148         if (r == NULL || e1 == NULL || e2 == NULL) {
1149                 ret = -ENOMEM;
1150                 goto fail;
1151         }
1152
1153         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1154         r->client       = client;
1155         r->todo         = todo;
1156         r->generation   = -1;
1157         r->channels     = request->channels;
1158         r->bandwidth    = request->bandwidth;
1159         r->e_alloc      = e1;
1160         r->e_dealloc    = e2;
1161
1162         e1->resource.closure    = request->closure;
1163         e1->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1164         e2->resource.closure    = request->closure;
1165         e2->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1166
1167         if (todo == ISO_RES_ALLOC) {
1168                 r->resource.release = release_iso_resource;
1169                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1170                 if (ret < 0)
1171                         goto fail;
1172         } else {
1173                 r->resource.release = NULL;
1174                 r->resource.handle = -1;
1175                 schedule_iso_resource(r);
1176         }
1177         request->handle = r->resource.handle;
1178
1179         return 0;
1180  fail:
1181         kfree(r);
1182         kfree(e1);
1183         kfree(e2);
1184
1185         return ret;
1186 }
1187
1188 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1189 {
1190         struct fw_cdev_allocate_iso_resource *request = buffer;
1191
1192         return init_iso_resource(client, request, ISO_RES_ALLOC);
1193 }
1194
1195 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1196 {
1197         struct fw_cdev_deallocate *request = buffer;
1198
1199         return release_client_resource(client, request->handle,
1200                                        release_iso_resource, NULL);
1201 }
1202
1203 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1204 {
1205         struct fw_cdev_allocate_iso_resource *request = buffer;
1206
1207         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1208 }
1209
1210 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1211 {
1212         struct fw_cdev_allocate_iso_resource *request = buffer;
1213
1214         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1215 }
1216
1217 /*
1218  * Returns a speed code:  Maximum speed to or from this device,
1219  * limited by the device's link speed, the local node's link speed,
1220  * and all PHY port speeds between the two links.
1221  */
1222 static int ioctl_get_speed(struct client *client, void *buffer)
1223 {
1224         return client->device->max_speed;
1225 }
1226
1227 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1228 {
1229         struct fw_cdev_send_request *request = buffer;
1230
1231         switch (request->tcode) {
1232         case TCODE_WRITE_QUADLET_REQUEST:
1233         case TCODE_WRITE_BLOCK_REQUEST:
1234                 break;
1235         default:
1236                 return -EINVAL;
1237         }
1238
1239         /* Security policy: Only allow accesses to Units Space. */
1240         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1241                 return -EACCES;
1242
1243         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1244 }
1245
1246 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1247 {
1248         struct fw_cdev_send_stream_packet *p = buffer;
1249         struct fw_cdev_send_request request;
1250         int dest;
1251
1252         if (p->speed > client->device->card->link_speed ||
1253             p->length > 1024 << p->speed)
1254                 return -EIO;
1255
1256         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1257                 return -EINVAL;
1258
1259         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1260         request.tcode           = TCODE_STREAM_DATA;
1261         request.length          = p->length;
1262         request.closure         = p->closure;
1263         request.data            = p->data;
1264         request.generation      = p->generation;
1265
1266         return init_request(client, &request, dest, p->speed);
1267 }
1268
1269 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1270         ioctl_get_info,
1271         ioctl_send_request,
1272         ioctl_allocate,
1273         ioctl_deallocate,
1274         ioctl_send_response,
1275         ioctl_initiate_bus_reset,
1276         ioctl_add_descriptor,
1277         ioctl_remove_descriptor,
1278         ioctl_create_iso_context,
1279         ioctl_queue_iso,
1280         ioctl_start_iso,
1281         ioctl_stop_iso,
1282         ioctl_get_cycle_timer,
1283         ioctl_allocate_iso_resource,
1284         ioctl_deallocate_iso_resource,
1285         ioctl_allocate_iso_resource_once,
1286         ioctl_deallocate_iso_resource_once,
1287         ioctl_get_speed,
1288         ioctl_send_broadcast_request,
1289         ioctl_send_stream_packet,
1290 };
1291
1292 static int dispatch_ioctl(struct client *client,
1293                           unsigned int cmd, void __user *arg)
1294 {
1295         char buffer[256];
1296         int ret;
1297
1298         if (_IOC_TYPE(cmd) != '#' ||
1299             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1300                 return -EINVAL;
1301
1302         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1303                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1304                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1305                         return -EFAULT;
1306         }
1307
1308         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1309         if (ret < 0)
1310                 return ret;
1311
1312         if (_IOC_DIR(cmd) & _IOC_READ) {
1313                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1314                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1315                         return -EFAULT;
1316         }
1317
1318         return ret;
1319 }
1320
1321 static long fw_device_op_ioctl(struct file *file,
1322                                unsigned int cmd, unsigned long arg)
1323 {
1324         struct client *client = file->private_data;
1325
1326         if (fw_device_is_shutdown(client->device))
1327                 return -ENODEV;
1328
1329         return dispatch_ioctl(client, cmd, (void __user *) arg);
1330 }
1331
1332 #ifdef CONFIG_COMPAT
1333 static long fw_device_op_compat_ioctl(struct file *file,
1334                                       unsigned int cmd, unsigned long arg)
1335 {
1336         struct client *client = file->private_data;
1337
1338         if (fw_device_is_shutdown(client->device))
1339                 return -ENODEV;
1340
1341         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1342 }
1343 #endif
1344
1345 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1346 {
1347         struct client *client = file->private_data;
1348         enum dma_data_direction direction;
1349         unsigned long size;
1350         int page_count, ret;
1351
1352         if (fw_device_is_shutdown(client->device))
1353                 return -ENODEV;
1354
1355         /* FIXME: We could support multiple buffers, but we don't. */
1356         if (client->buffer.pages != NULL)
1357                 return -EBUSY;
1358
1359         if (!(vma->vm_flags & VM_SHARED))
1360                 return -EINVAL;
1361
1362         if (vma->vm_start & ~PAGE_MASK)
1363                 return -EINVAL;
1364
1365         client->vm_start = vma->vm_start;
1366         size = vma->vm_end - vma->vm_start;
1367         page_count = size >> PAGE_SHIFT;
1368         if (size & ~PAGE_MASK)
1369                 return -EINVAL;
1370
1371         if (vma->vm_flags & VM_WRITE)
1372                 direction = DMA_TO_DEVICE;
1373         else
1374                 direction = DMA_FROM_DEVICE;
1375
1376         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1377                                  page_count, direction);
1378         if (ret < 0)
1379                 return ret;
1380
1381         ret = fw_iso_buffer_map(&client->buffer, vma);
1382         if (ret < 0)
1383                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1384
1385         return ret;
1386 }
1387
1388 static int shutdown_resource(int id, void *p, void *data)
1389 {
1390         struct client_resource *r = p;
1391         struct client *client = data;
1392
1393         r->release(client, r);
1394         client_put(client);
1395
1396         return 0;
1397 }
1398
1399 static int fw_device_op_release(struct inode *inode, struct file *file)
1400 {
1401         struct client *client = file->private_data;
1402         struct event *e, *next_e;
1403
1404         mutex_lock(&client->device->client_list_mutex);
1405         list_del(&client->link);
1406         mutex_unlock(&client->device->client_list_mutex);
1407
1408         if (client->iso_context)
1409                 fw_iso_context_destroy(client->iso_context);
1410
1411         if (client->buffer.pages)
1412                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1413
1414         /* Freeze client->resource_idr and client->event_list */
1415         spin_lock_irq(&client->lock);
1416         client->in_shutdown = true;
1417         spin_unlock_irq(&client->lock);
1418
1419         idr_for_each(&client->resource_idr, shutdown_resource, client);
1420         idr_remove_all(&client->resource_idr);
1421         idr_destroy(&client->resource_idr);
1422
1423         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1424                 kfree(e);
1425
1426         client_put(client);
1427
1428         return 0;
1429 }
1430
1431 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1432 {
1433         struct client *client = file->private_data;
1434         unsigned int mask = 0;
1435
1436         poll_wait(file, &client->wait, pt);
1437
1438         if (fw_device_is_shutdown(client->device))
1439                 mask |= POLLHUP | POLLERR;
1440         if (!list_empty(&client->event_list))
1441                 mask |= POLLIN | POLLRDNORM;
1442
1443         return mask;
1444 }
1445
1446 const struct file_operations fw_device_ops = {
1447         .owner          = THIS_MODULE,
1448         .open           = fw_device_op_open,
1449         .read           = fw_device_op_read,
1450         .unlocked_ioctl = fw_device_op_ioctl,
1451         .poll           = fw_device_op_poll,
1452         .release        = fw_device_op_release,
1453         .mmap           = fw_device_op_mmap,
1454
1455 #ifdef CONFIG_COMPAT
1456         .compat_ioctl   = fw_device_op_compat_ioctl,
1457 #endif
1458 };