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         __be32 transaction_data[2];
 129         struct iso_resource_event *e_alloc, *e_dealloc;
 130 };
 131
 132 static void 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         struct event *event;
 241         size_t size, total;
 242         int i, ret;
 243
 244         ret = wait_event_interruptible(client->wait,
 245                         !list_empty(&client->event_list) ||
 246                         fw_device_is_shutdown(client->device));
 247         if (ret < 0)
 248                 return ret;
 249
 250         if (list_empty(&client->event_list) &&
 251                        fw_device_is_shutdown(client->device))
 252                 return -ENODEV;
 253
 254         spin_lock_irq(&client->lock);
 255         event = list_first_entry(&client->event_list, struct event, link);
 256         list_del(&event->link);
 257         spin_unlock_irq(&client->lock);
 258
 259         total = 0;
 260         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 261                 size = min(event->v[i].size, count - total);
 262                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 263                         ret = -EFAULT;
 264                         goto out;
 265                 }
 266                 total += size;
 267         }
 268         ret = total;
 269
 270  out:
 271         kfree(event);
 272
 273         return ret;
 274 }
 275
 276 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 277                                  size_t count, loff_t *offset)
 278 {
 279         struct client *client = file->private_data;
 280
 281         return dequeue_event(client, buffer, count);
 282 }
 283
 284 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 285                                  struct client *client)
 286 {
 287         struct fw_card *card = client->device->card;
 288
 289         spin_lock_irq(&card->lock);
 290
 291         event->closure       = client->bus_reset_closure;
 292         event->type          = FW_CDEV_EVENT_BUS_RESET;
 293         event->generation    = client->device->generation;
 294         event->node_id       = client->device->node_id;
 295         event->local_node_id = card->local_node->node_id;
 296         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 297         event->irm_node_id   = card->irm_node->node_id;
 298         event->root_node_id  = card->root_node->node_id;
 299
 300         spin_unlock_irq(&card->lock);
 301 }
 302
 303 static void for_each_client(struct fw_device *device,
 304                             void (*callback)(struct client *client))
 305 {
 306         struct client *c;
 307
 308         mutex_lock(&device->client_list_mutex);
 309         list_for_each_entry(c, &device->client_list, link)
 310                 callback(c);
 311         mutex_unlock(&device->client_list_mutex);
 312 }
 313
 314 static int schedule_reallocations(int id, void *p, void *data)
 315 {
 316         struct client_resource *r = p;
 317
 318         if (r->release == release_iso_resource)
 319                 schedule_iso_resource(container_of(r,
 320                                         struct iso_resource, resource));
 321         return 0;
 322 }
 323
 324 static void queue_bus_reset_event(struct client *client)
 325 {
 326         struct bus_reset_event *e;
 327
 328         e = kzalloc(sizeof(*e), GFP_KERNEL);
 329         if (e == NULL) {
 330                 fw_notify("Out of memory when allocating bus reset event\n");
 331                 return;
 332         }
 333
 334         fill_bus_reset_event(&e->reset, client);
 335
 336         queue_event(client, &e->event,
 337                     &e->reset, sizeof(e->reset), NULL, 0);
 338
 339         spin_lock_irq(&client->lock);
 340         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 341         spin_unlock_irq(&client->lock);
 342 }
 343
 344 void fw_device_cdev_update(struct fw_device *device)
 345 {
 346         for_each_client(device, queue_bus_reset_event);
 347 }
 348
 349 static void wake_up_client(struct client *client)
 350 {
 351         wake_up_interruptible(&client->wait);
 352 }
 353
 354 void fw_device_cdev_remove(struct fw_device *device)
 355 {
 356         for_each_client(device, wake_up_client);
 357 }
 358
 359 static int ioctl_get_info(struct client *client, void *buffer)
 360 {
 361         struct fw_cdev_get_info *get_info = buffer;
 362         struct fw_cdev_event_bus_reset bus_reset;
 363         unsigned long ret = 0;
 364
 365         client->version = get_info->version;
 366         get_info->version = FW_CDEV_VERSION;
 367         get_info->card = client->device->card->index;
 368
 369         down_read(&fw_device_rwsem);
 370
 371         if (get_info->rom != 0) {
 372                 void __user *uptr = u64_to_uptr(get_info->rom);
 373                 size_t want = get_info->rom_length;
 374                 size_t have = client->device->config_rom_length * 4;
 375
 376                 ret = copy_to_user(uptr, client->device->config_rom,
 377                                    min(want, have));
 378         }
 379         get_info->rom_length = client->device->config_rom_length * 4;
 380
 381         up_read(&fw_device_rwsem);
 382
 383         if (ret != 0)
 384                 return -EFAULT;
 385
 386         client->bus_reset_closure = get_info->bus_reset_closure;
 387         if (get_info->bus_reset != 0) {
 388                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 389
 390                 fill_bus_reset_event(&bus_reset, client);
 391                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 392                         return -EFAULT;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int add_client_resource(struct client *client,
 399                                struct client_resource *resource, gfp_t gfp_mask)
 400 {
 401         unsigned long flags;
 402         int ret;
 403
 404  retry:
 405         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 406                 return -ENOMEM;
 407
 408         spin_lock_irqsave(&client->lock, flags);
 409         if (client->in_shutdown)
 410                 ret = -ECANCELED;
 411         else
 412                 ret = idr_get_new(&client->resource_idr, resource,
 413                                   &resource->handle);
 414         if (ret >= 0) {
 415                 client_get(client);
 416                 if (resource->release == release_iso_resource)
 417                         schedule_iso_resource(container_of(resource,
 418                                                 struct iso_resource, resource));
 419         }
 420         spin_unlock_irqrestore(&client->lock, flags);
 421
 422         if (ret == -EAGAIN)
 423                 goto retry;
 424
 425         return ret < 0 ? ret : 0;
 426 }
 427
 428 static int release_client_resource(struct client *client, u32 handle,
 429                                    client_resource_release_fn_t release,
 430                                    struct client_resource **resource)
 431 {
 432         struct client_resource *r;
 433
 434         spin_lock_irq(&client->lock);
 435         if (client->in_shutdown)
 436                 r = NULL;
 437         else
 438                 r = idr_find(&client->resource_idr, handle);
 439         if (r && r->release == release)
 440                 idr_remove(&client->resource_idr, handle);
 441         spin_unlock_irq(&client->lock);
 442
 443         if (!(r && r->release == release))
 444                 return -EINVAL;
 445
 446         if (resource)
 447                 *resource = r;
 448         else
 449                 r->release(client, r);
 450
 451         client_put(client);
 452
 453         return 0;
 454 }
 455
 456 static void release_transaction(struct client *client,
 457                                 struct client_resource *resource)
 458 {
 459         struct outbound_transaction_resource *r = container_of(resource,
 460                         struct outbound_transaction_resource, resource);
 461
 462         fw_cancel_transaction(client->device->card, &r->transaction);
 463 }
 464
 465 static void complete_transaction(struct fw_card *card, int rcode,
 466                                  void *payload, size_t length, void *data)
 467 {
 468         struct outbound_transaction_event *e = data;
 469         struct fw_cdev_event_response *rsp = &e->response;
 470         struct client *client = e->client;
 471         unsigned long flags;
 472
 473         if (length < rsp->length)
 474                 rsp->length = length;
 475         if (rcode == RCODE_COMPLETE)
 476                 memcpy(rsp->data, payload, rsp->length);
 477
 478         spin_lock_irqsave(&client->lock, flags);
 479         /*
 480          * 1. If called while in shutdown, the idr tree must be left untouched.
 481          *    The idr handle will be removed and the client reference will be
 482          *    dropped later.
 483          * 2. If the call chain was release_client_resource ->
 484          *    release_transaction -> complete_transaction (instead of a normal
 485          *    conclusion of the transaction), i.e. if this resource was already
 486          *    unregistered from the idr, the client reference will be dropped
 487          *    by release_client_resource and we must not drop it here.
 488          */
 489         if (!client->in_shutdown &&
 490             idr_find(&client->resource_idr, e->r.resource.handle)) {
 491                 idr_remove(&client->resource_idr, e->r.resource.handle);
 492                 /* Drop the idr's reference */
 493                 client_put(client);
 494         }
 495         spin_unlock_irqrestore(&client->lock, flags);
 496
 497         rsp->type = FW_CDEV_EVENT_RESPONSE;
 498         rsp->rcode = rcode;
 499
 500         /*
 501          * In the case that sizeof(*rsp) doesn't align with the position of the
 502          * data, and the read is short, preserve an extra copy of the data
 503          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 504          * for short reads and some apps depended on it, this is both safe
 505          * and prudent for compatibility.
 506          */
 507         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 508                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 509                             rsp->data, rsp->length);
 510         else
 511                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 512                             NULL, 0);
 513
 514         /* Drop the transaction callback's reference */
 515         client_put(client);
 516 }
 517
 518 static int init_request(struct client *client,
 519                         struct fw_cdev_send_request *request,
 520                         int destination_id, int speed)
 521 {
 522         struct outbound_transaction_event *e;
 523         int ret;
 524
 525         if (request->tcode != TCODE_STREAM_DATA &&
 526             (request->length > 4096 || request->length > 512 << speed))
 527                 return -EIO;
 528
 529         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 530         if (e == NULL)
 531                 return -ENOMEM;
 532
 533         e->client = client;
 534         e->response.length = request->length;
 535         e->response.closure = request->closure;
 536
 537         if (request->data &&
 538             copy_from_user(e->response.data,
 539                            u64_to_uptr(request->data), request->length)) {
 540                 ret = -EFAULT;
 541                 goto failed;
 542         }
 543
 544         e->r.resource.release = release_transaction;
 545         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 546         if (ret < 0)
 547                 goto failed;
 548
 549         /* Get a reference for the transaction callback */
 550         client_get(client);
 551
 552         fw_send_request(client->device->card, &e->r.transaction,
 553                         request->tcode, destination_id, request->generation,
 554                         speed, request->offset, e->response.data,
 555                         request->length, complete_transaction, e);
 556         return 0;
 557
 558  failed:
 559         kfree(e);
 560
 561         return ret;
 562 }
 563
 564 static int ioctl_send_request(struct client *client, void *buffer)
 565 {
 566         struct fw_cdev_send_request *request = buffer;
 567
 568         switch (request->tcode) {
 569         case TCODE_WRITE_QUADLET_REQUEST:
 570         case TCODE_WRITE_BLOCK_REQUEST:
 571         case TCODE_READ_QUADLET_REQUEST:
 572         case TCODE_READ_BLOCK_REQUEST:
 573         case TCODE_LOCK_MASK_SWAP:
 574         case TCODE_LOCK_COMPARE_SWAP:
 575         case TCODE_LOCK_FETCH_ADD:
 576         case TCODE_LOCK_LITTLE_ADD:
 577         case TCODE_LOCK_BOUNDED_ADD:
 578         case TCODE_LOCK_WRAP_ADD:
 579         case TCODE_LOCK_VENDOR_DEPENDENT:
 580                 break;
 581         default:
 582                 return -EINVAL;
 583         }
 584
 585         return init_request(client, request, client->device->node_id,
 586                             client->device->max_speed);
 587 }
 588
 589 static void release_request(struct client *client,
 590                             struct client_resource *resource)
 591 {
 592         struct inbound_transaction_resource *r = container_of(resource,
 593                         struct inbound_transaction_resource, resource);
 594
 595         fw_send_response(client->device->card, r->request,
 596                          RCODE_CONFLICT_ERROR);
 597         kfree(r);
 598 }
 599
 600 static void handle_request(struct fw_card *card, struct fw_request *request,
 601                            int tcode, int destination, int source,
 602                            int generation, int speed,
 603                            unsigned long long offset,
 604                            void *payload, size_t length, void *callback_data)
 605 {
 606         struct address_handler_resource *handler = callback_data;
 607         struct inbound_transaction_resource *r;
 608         struct inbound_transaction_event *e;
 609         int ret;
 610
 611         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 612         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 613         if (r == NULL || e == NULL)
 614                 goto failed;
 615
 616         r->request = request;
 617         r->data    = payload;
 618         r->length  = length;
 619
 620         r->resource.release = release_request;
 621         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 622         if (ret < 0)
 623                 goto failed;
 624
 625         e->request.type    = FW_CDEV_EVENT_REQUEST;
 626         e->request.tcode   = tcode;
 627         e->request.offset  = offset;
 628         e->request.length  = length;
 629         e->request.handle  = r->resource.handle;
 630         e->request.closure = handler->closure;
 631
 632         queue_event(handler->client, &e->event,
 633                     &e->request, sizeof(e->request), payload, length);
 634         return;
 635
 636  failed:
 637         kfree(r);
 638         kfree(e);
 639         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 640 }
 641
 642 static void release_address_handler(struct client *client,
 643                                     struct client_resource *resource)
 644 {
 645         struct address_handler_resource *r =
 646             container_of(resource, struct address_handler_resource, resource);
 647
 648         fw_core_remove_address_handler(&r->handler);
 649         kfree(r);
 650 }
 651
 652 static int ioctl_allocate(struct client *client, void *buffer)
 653 {
 654         struct fw_cdev_allocate *request = buffer;
 655         struct address_handler_resource *r;
 656         struct fw_address_region region;
 657         int ret;
 658
 659         r = kmalloc(sizeof(*r), GFP_KERNEL);
 660         if (r == NULL)
 661                 return -ENOMEM;
 662
 663         region.start = request->offset;
 664         region.end = request->offset + request->length;
 665         r->handler.length = request->length;
 666         r->handler.address_callback = handle_request;
 667         r->handler.callback_data = r;
 668         r->closure = request->closure;
 669         r->client = client;
 670
 671         ret = fw_core_add_address_handler(&r->handler, &region);
 672         if (ret < 0) {
 673                 kfree(r);
 674                 return ret;
 675         }
 676
 677         r->resource.release = release_address_handler;
 678         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 679         if (ret < 0) {
 680                 release_address_handler(client, &r->resource);
 681                 return ret;
 682         }
 683         request->handle = r->resource.handle;
 684
 685         return 0;
 686 }
 687
 688 static int ioctl_deallocate(struct client *client, void *buffer)
 689 {
 690         struct fw_cdev_deallocate *request = buffer;
 691
 692         return release_client_resource(client, request->handle,
 693                                        release_address_handler, NULL);
 694 }
 695
 696 static int ioctl_send_response(struct client *client, void *buffer)
 697 {
 698         struct fw_cdev_send_response *request = buffer;
 699         struct client_resource *resource;
 700         struct inbound_transaction_resource *r;
 701
 702         if (release_client_resource(client, request->handle,
 703                                     release_request, &resource) < 0)
 704                 return -EINVAL;
 705
 706         r = container_of(resource, struct inbound_transaction_resource,
 707                          resource);
 708         if (request->length < r->length)
 709                 r->length = request->length;
 710         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 711                 return -EFAULT;
 712
 713         fw_send_response(client->device->card, r->request, request->rcode);
 714         kfree(r);
 715
 716         return 0;
 717 }
 718
 719 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 720 {
 721         struct fw_cdev_initiate_bus_reset *request = buffer;
 722         int short_reset;
 723
 724         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 725
 726         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 727 }
 728
 729 static void release_descriptor(struct client *client,
 730                                struct client_resource *resource)
 731 {
 732         struct descriptor_resource *r =
 733                 container_of(resource, struct descriptor_resource, resource);
 734
 735         fw_core_remove_descriptor(&r->descriptor);
 736         kfree(r);
 737 }
 738
 739 static int ioctl_add_descriptor(struct client *client, void *buffer)
 740 {
 741         struct fw_cdev_add_descriptor *request = buffer;
 742         struct descriptor_resource *r;
 743         int ret;
 744
 745         /* Access policy: Allow this ioctl only on local nodes' device files. */
 746         if (!client->device->is_local)
 747                 return -ENOSYS;
 748
 749         if (request->length > 256)
 750                 return -EINVAL;
 751
 752         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 753         if (r == NULL)
 754                 return -ENOMEM;
 755
 756         if (copy_from_user(r->data,
 757                            u64_to_uptr(request->data), request->length * 4)) {
 758                 ret = -EFAULT;
 759                 goto failed;
 760         }
 761
 762         r->descriptor.length    = request->length;
 763         r->descriptor.immediate = request->immediate;
 764         r->descriptor.key       = request->key;
 765         r->descriptor.data      = r->data;
 766
 767         ret = fw_core_add_descriptor(&r->descriptor);
 768         if (ret < 0)
 769                 goto failed;
 770
 771         r->resource.release = release_descriptor;
 772         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 773         if (ret < 0) {
 774                 fw_core_remove_descriptor(&r->descriptor);
 775                 goto failed;
 776         }
 777         request->handle = r->resource.handle;
 778
 779         return 0;
 780  failed:
 781         kfree(r);
 782
 783         return ret;
 784 }
 785
 786 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 787 {
 788         struct fw_cdev_remove_descriptor *request = buffer;
 789
 790         return release_client_resource(client, request->handle,
 791                                        release_descriptor, NULL);
 792 }
 793
 794 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 795                          size_t header_length, void *header, void *data)
 796 {
 797         struct client *client = data;
 798         struct iso_interrupt_event *e;
 799
 800         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 801         if (e == NULL)
 802                 return;
 803
 804         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 805         e->interrupt.closure   = client->iso_closure;
 806         e->interrupt.cycle     = cycle;
 807         e->interrupt.header_length = header_length;
 808         memcpy(e->interrupt.header, header, header_length);
 809         queue_event(client, &e->event, &e->interrupt,
 810                     sizeof(e->interrupt) + header_length, NULL, 0);
 811 }
 812
 813 static int ioctl_create_iso_context(struct client *client, void *buffer)
 814 {
 815         struct fw_cdev_create_iso_context *request = buffer;
 816         struct fw_iso_context *context;
 817
 818         /* We only support one context at this time. */
 819         if (client->iso_context != NULL)
 820                 return -EBUSY;
 821
 822         if (request->channel > 63)
 823                 return -EINVAL;
 824
 825         switch (request->type) {
 826         case FW_ISO_CONTEXT_RECEIVE:
 827                 if (request->header_size < 4 || (request->header_size & 3))
 828                         return -EINVAL;
 829
 830                 break;
 831
 832         case FW_ISO_CONTEXT_TRANSMIT:
 833                 if (request->speed > SCODE_3200)
 834                         return -EINVAL;
 835
 836                 break;
 837
 838         default:
 839                 return -EINVAL;
 840         }
 841
 842         context =  fw_iso_context_create(client->device->card,
 843                                          request->type,
 844                                          request->channel,
 845                                          request->speed,
 846                                          request->header_size,
 847                                          iso_callback, client);
 848         if (IS_ERR(context))
 849                 return PTR_ERR(context);
 850
 851         client->iso_closure = request->closure;
 852         client->iso_context = context;
 853
 854         /* We only support one context at this time. */
 855         request->handle = 0;
 856
 857         return 0;
 858 }
 859
 860 /* Macros for decoding the iso packet control header. */
 861 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 862 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 863 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 864 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 865 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 866 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 867
 868 static int ioctl_queue_iso(struct client *client, void *buffer)
 869 {
 870         struct fw_cdev_queue_iso *request = buffer;
 871         struct fw_cdev_iso_packet __user *p, *end, *next;
 872         struct fw_iso_context *ctx = client->iso_context;
 873         unsigned long payload, buffer_end, header_length;
 874         u32 control;
 875         int count;
 876         struct {
 877                 struct fw_iso_packet packet;
 878                 u8 header[256];
 879         } u;
 880
 881         if (ctx == NULL || request->handle != 0)
 882                 return -EINVAL;
 883
 884         /*
 885          * If the user passes a non-NULL data pointer, has mmap()'ed
 886          * the iso buffer, and the pointer points inside the buffer,
 887          * we setup the payload pointers accordingly.  Otherwise we
 888          * set them both to 0, which will still let packets with
 889          * payload_length == 0 through.  In other words, if no packets
 890          * use the indirect payload, the iso buffer need not be mapped
 891          * and the request->data pointer is ignored.
 892          */
 893
 894         payload = (unsigned long)request->data - client->vm_start;
 895         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 896         if (request->data == 0 || client->buffer.pages == NULL ||
 897             payload >= buffer_end) {
 898                 payload = 0;
 899                 buffer_end = 0;
 900         }
 901
 902         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 903
 904         if (!access_ok(VERIFY_READ, p, request->size))
 905                 return -EFAULT;
 906
 907         end = (void __user *)p + request->size;
 908         count = 0;
 909         while (p < end) {
 910                 if (get_user(control, &p->control))
 911                         return -EFAULT;
 912                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 913                 u.packet.interrupt = GET_INTERRUPT(control);
 914                 u.packet.skip = GET_SKIP(control);
 915                 u.packet.tag = GET_TAG(control);
 916                 u.packet.sy = GET_SY(control);
 917                 u.packet.header_length = GET_HEADER_LENGTH(control);
 918
 919                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 920                         header_length = u.packet.header_length;
 921                 } else {
 922                         /*
 923                          * We require that header_length is a multiple of
 924                          * the fixed header size, ctx->header_size.
 925                          */
 926                         if (ctx->header_size == 0) {
 927                                 if (u.packet.header_length > 0)
 928                                         return -EINVAL;
 929                         } else if (u.packet.header_length % ctx->header_size != 0) {
 930                                 return -EINVAL;
 931                         }
 932                         header_length = 0;
 933                 }
 934
 935                 next = (struct fw_cdev_iso_packet __user *)
 936                         &p->header[header_length / 4];
 937                 if (next > end)
 938                         return -EINVAL;
 939                 if (__copy_from_user
 940                     (u.packet.header, p->header, header_length))
 941                         return -EFAULT;
 942                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 943                     u.packet.header_length + u.packet.payload_length > 0)
 944                         return -EINVAL;
 945                 if (payload + u.packet.payload_length > buffer_end)
 946                         return -EINVAL;
 947
 948                 if (fw_iso_context_queue(ctx, &u.packet,
 949                                          &client->buffer, payload))
 950                         break;
 951
 952                 p = next;
 953                 payload += u.packet.payload_length;
 954                 count++;
 955         }
 956
 957         request->size    -= uptr_to_u64(p) - request->packets;
 958         request->packets  = uptr_to_u64(p);
 959         request->data     = client->vm_start + payload;
 960
 961         return count;
 962 }
 963
 964 static int ioctl_start_iso(struct client *client, void *buffer)
 965 {
 966         struct fw_cdev_start_iso *request = buffer;
 967
 968         if (client->iso_context == NULL || request->handle != 0)
 969                 return -EINVAL;
 970
 971         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 972                 if (request->tags == 0 || request->tags > 15)
 973                         return -EINVAL;
 974
 975                 if (request->sync > 15)
 976                         return -EINVAL;
 977         }
 978
 979         return fw_iso_context_start(client->iso_context, request->cycle,
 980                                     request->sync, request->tags);
 981 }
 982
 983 static int ioctl_stop_iso(struct client *client, void *buffer)
 984 {
 985         struct fw_cdev_stop_iso *request = buffer;
 986
 987         if (client->iso_context == NULL || request->handle != 0)
 988                 return -EINVAL;
 989
 990         return fw_iso_context_stop(client->iso_context);
 991 }
 992
 993 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 994 {
 995         struct fw_cdev_get_cycle_timer *request = buffer;
 996         struct fw_card *card = client->device->card;
 997         unsigned long long bus_time;
 998         struct timeval tv;
 999         unsigned long flags;
1000
1001         preempt_disable();
1002         local_irq_save(flags);
1003
1004         bus_time = card->driver->get_bus_time(card);
1005         do_gettimeofday(&tv);
1006
1007         local_irq_restore(flags);
1008         preempt_enable();
1009
1010         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1011         request->cycle_timer = bus_time & 0xffffffff;
1012         return 0;
1013 }
1014
1015 static void iso_resource_work(struct work_struct *work)
1016 {
1017         struct iso_resource_event *e;
1018         struct iso_resource *r =
1019                         container_of(work, struct iso_resource, work.work);
1020         struct client *client = r->client;
1021         int generation, channel, bandwidth, todo;
1022         bool skip, free, success;
1023
1024         spin_lock_irq(&client->lock);
1025         generation = client->device->generation;
1026         todo = r->todo;
1027         /* Allow 1000ms grace period for other reallocations. */
1028         if (todo == ISO_RES_ALLOC &&
1029             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1030                 if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
1031                         client_get(client);
1032                 skip = true;
1033         } else {
1034                 /* We could be called twice within the same generation. */
1035                 skip = todo == ISO_RES_REALLOC &&
1036                        r->generation == generation;
1037         }
1038         free = todo == ISO_RES_DEALLOC ||
1039                todo == ISO_RES_ALLOC_ONCE ||
1040                todo == ISO_RES_DEALLOC_ONCE;
1041         r->generation = generation;
1042         spin_unlock_irq(&client->lock);
1043
1044         if (skip)
1045                 goto out;
1046
1047         bandwidth = r->bandwidth;
1048
1049         fw_iso_resource_manage(client->device->card, generation,
1050                         r->channels, &channel, &bandwidth,
1051                         todo == ISO_RES_ALLOC ||
1052                         todo == ISO_RES_REALLOC ||
1053                         todo == ISO_RES_ALLOC_ONCE,
1054                         r->transaction_data);
1055         /*
1056          * Is this generation outdated already?  As long as this resource sticks
1057          * in the idr, it will be scheduled again for a newer generation or at
1058          * shutdown.
1059          */
1060         if (channel == -EAGAIN &&
1061             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1062                 goto out;
1063
1064         success = channel >= 0 || bandwidth > 0;
1065
1066         spin_lock_irq(&client->lock);
1067         /*
1068          * Transit from allocation to reallocation, except if the client
1069          * requested deallocation in the meantime.
1070          */
1071         if (r->todo == ISO_RES_ALLOC)
1072                 r->todo = ISO_RES_REALLOC;
1073         /*
1074          * Allocation or reallocation failure?  Pull this resource out of the
1075          * idr and prepare for deletion, unless the client is shutting down.
1076          */
1077         if (r->todo == ISO_RES_REALLOC && !success &&
1078             !client->in_shutdown &&
1079             idr_find(&client->resource_idr, r->resource.handle)) {
1080                 idr_remove(&client->resource_idr, r->resource.handle);
1081                 client_put(client);
1082                 free = true;
1083         }
1084         spin_unlock_irq(&client->lock);
1085
1086         if (todo == ISO_RES_ALLOC && channel >= 0)
1087                 r->channels = 1ULL << channel;
1088
1089         if (todo == ISO_RES_REALLOC && success)
1090                 goto out;
1091
1092         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1093                 e = r->e_alloc;
1094                 r->e_alloc = NULL;
1095         } else {
1096                 e = r->e_dealloc;
1097                 r->e_dealloc = NULL;
1098         }
1099         e->resource.handle      = r->resource.handle;
1100         e->resource.channel     = channel;
1101         e->resource.bandwidth   = bandwidth;
1102
1103         queue_event(client, &e->event,
1104                     &e->resource, sizeof(e->resource), NULL, 0);
1105
1106         if (free) {
1107                 cancel_delayed_work(&r->work);
1108                 kfree(r->e_alloc);
1109                 kfree(r->e_dealloc);
1110                 kfree(r);
1111         }
1112  out:
1113         client_put(client);
1114 }
1115
1116 static void schedule_iso_resource(struct iso_resource *r)
1117 {
1118         client_get(r->client);
1119         if (!schedule_delayed_work(&r->work, 0))
1120                 client_put(r->client);
1121 }
1122
1123 static void release_iso_resource(struct client *client,
1124                                  struct client_resource *resource)
1125 {
1126         struct iso_resource *r =
1127                 container_of(resource, struct iso_resource, resource);
1128
1129         spin_lock_irq(&client->lock);
1130         r->todo = ISO_RES_DEALLOC;
1131         schedule_iso_resource(r);
1132         spin_unlock_irq(&client->lock);
1133 }
1134
1135 static int init_iso_resource(struct client *client,
1136                 struct fw_cdev_allocate_iso_resource *request, int todo)
1137 {
1138         struct iso_resource_event *e1, *e2;
1139         struct iso_resource *r;
1140         int ret;
1141
1142         if ((request->channels == 0 && request->bandwidth == 0) ||
1143             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1144             request->bandwidth < 0)
1145                 return -EINVAL;
1146
1147         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1148         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1149         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1150         if (r == NULL || e1 == NULL || e2 == NULL) {
1151                 ret = -ENOMEM;
1152                 goto fail;
1153         }
1154
1155         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1156         r->client       = client;
1157         r->todo         = todo;
1158         r->generation   = -1;
1159         r->channels     = request->channels;
1160         r->bandwidth    = request->bandwidth;
1161         r->e_alloc      = e1;
1162         r->e_dealloc    = e2;
1163
1164         e1->resource.closure    = request->closure;
1165         e1->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1166         e2->resource.closure    = request->closure;
1167         e2->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1168
1169         if (todo == ISO_RES_ALLOC) {
1170                 r->resource.release = release_iso_resource;
1171                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1172                 if (ret < 0)
1173                         goto fail;
1174         } else {
1175                 r->resource.release = NULL;
1176                 r->resource.handle = -1;
1177                 schedule_iso_resource(r);
1178         }
1179         request->handle = r->resource.handle;
1180
1181         return 0;
1182  fail:
1183         kfree(r);
1184         kfree(e1);
1185         kfree(e2);
1186
1187         return ret;
1188 }
1189
1190 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1191 {
1192         struct fw_cdev_allocate_iso_resource *request = buffer;
1193
1194         return init_iso_resource(client, request, ISO_RES_ALLOC);
1195 }
1196
1197 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1198 {
1199         struct fw_cdev_deallocate *request = buffer;
1200
1201         return release_client_resource(client, request->handle,
1202                                        release_iso_resource, NULL);
1203 }
1204
1205 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1206 {
1207         struct fw_cdev_allocate_iso_resource *request = buffer;
1208
1209         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1210 }
1211
1212 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1213 {
1214         struct fw_cdev_allocate_iso_resource *request = buffer;
1215
1216         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1217 }
1218
1219 /*
1220  * Returns a speed code:  Maximum speed to or from this device,
1221  * limited by the device's link speed, the local node's link speed,
1222  * and all PHY port speeds between the two links.
1223  */
1224 static int ioctl_get_speed(struct client *client, void *buffer)
1225 {
1226         return client->device->max_speed;
1227 }
1228
1229 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1230 {
1231         struct fw_cdev_send_request *request = buffer;
1232
1233         switch (request->tcode) {
1234         case TCODE_WRITE_QUADLET_REQUEST:
1235         case TCODE_WRITE_BLOCK_REQUEST:
1236                 break;
1237         default:
1238                 return -EINVAL;
1239         }
1240
1241         /* Security policy: Only allow accesses to Units Space. */
1242         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1243                 return -EACCES;
1244
1245         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1246 }
1247
1248 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1249 {
1250         struct fw_cdev_send_stream_packet *p = buffer;
1251         struct fw_cdev_send_request request;
1252         int dest;
1253
1254         if (p->speed > client->device->card->link_speed ||
1255             p->length > 1024 << p->speed)
1256                 return -EIO;
1257
1258         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1259                 return -EINVAL;
1260
1261         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1262         request.tcode           = TCODE_STREAM_DATA;
1263         request.length          = p->length;
1264         request.closure         = p->closure;
1265         request.data            = p->data;
1266         request.generation      = p->generation;
1267
1268         return init_request(client, &request, dest, p->speed);
1269 }
1270
1271 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1272         ioctl_get_info,
1273         ioctl_send_request,
1274         ioctl_allocate,
1275         ioctl_deallocate,
1276         ioctl_send_response,
1277         ioctl_initiate_bus_reset,
1278         ioctl_add_descriptor,
1279         ioctl_remove_descriptor,
1280         ioctl_create_iso_context,
1281         ioctl_queue_iso,
1282         ioctl_start_iso,
1283         ioctl_stop_iso,
1284         ioctl_get_cycle_timer,
1285         ioctl_allocate_iso_resource,
1286         ioctl_deallocate_iso_resource,
1287         ioctl_allocate_iso_resource_once,
1288         ioctl_deallocate_iso_resource_once,
1289         ioctl_get_speed,
1290         ioctl_send_broadcast_request,
1291         ioctl_send_stream_packet,
1292 };
1293
1294 static int dispatch_ioctl(struct client *client,
1295                           unsigned int cmd, void __user *arg)
1296 {
1297         char buffer[256];
1298         int ret;
1299
1300         if (_IOC_TYPE(cmd) != '#' ||
1301             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1302                 return -EINVAL;
1303
1304         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1305                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1306                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1307                         return -EFAULT;
1308         }
1309
1310         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1311         if (ret < 0)
1312                 return ret;
1313
1314         if (_IOC_DIR(cmd) & _IOC_READ) {
1315                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1316                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1317                         return -EFAULT;
1318         }
1319
1320         return ret;
1321 }
1322
1323 static long fw_device_op_ioctl(struct file *file,
1324                                unsigned int cmd, unsigned long arg)
1325 {
1326         struct client *client = file->private_data;
1327
1328         if (fw_device_is_shutdown(client->device))
1329                 return -ENODEV;
1330
1331         return dispatch_ioctl(client, cmd, (void __user *) arg);
1332 }
1333
1334 #ifdef CONFIG_COMPAT
1335 static long fw_device_op_compat_ioctl(struct file *file,
1336                                       unsigned int cmd, unsigned long arg)
1337 {
1338         struct client *client = file->private_data;
1339
1340         if (fw_device_is_shutdown(client->device))
1341                 return -ENODEV;
1342
1343         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1344 }
1345 #endif
1346
1347 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1348 {
1349         struct client *client = file->private_data;
1350         enum dma_data_direction direction;
1351         unsigned long size;
1352         int page_count, ret;
1353
1354         if (fw_device_is_shutdown(client->device))
1355                 return -ENODEV;
1356
1357         /* FIXME: We could support multiple buffers, but we don't. */
1358         if (client->buffer.pages != NULL)
1359                 return -EBUSY;
1360
1361         if (!(vma->vm_flags & VM_SHARED))
1362                 return -EINVAL;
1363
1364         if (vma->vm_start & ~PAGE_MASK)
1365                 return -EINVAL;
1366
1367         client->vm_start = vma->vm_start;
1368         size = vma->vm_end - vma->vm_start;
1369         page_count = size >> PAGE_SHIFT;
1370         if (size & ~PAGE_MASK)
1371                 return -EINVAL;
1372
1373         if (vma->vm_flags & VM_WRITE)
1374                 direction = DMA_TO_DEVICE;
1375         else
1376                 direction = DMA_FROM_DEVICE;
1377
1378         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1379                                  page_count, direction);
1380         if (ret < 0)
1381                 return ret;
1382
1383         ret = fw_iso_buffer_map(&client->buffer, vma);
1384         if (ret < 0)
1385                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1386
1387         return ret;
1388 }
1389
1390 static int shutdown_resource(int id, void *p, void *data)
1391 {
1392         struct client_resource *r = p;
1393         struct client *client = data;
1394
1395         r->release(client, r);
1396         client_put(client);
1397
1398         return 0;
1399 }
1400
1401 static int fw_device_op_release(struct inode *inode, struct file *file)
1402 {
1403         struct client *client = file->private_data;
1404         struct event *e, *next_e;
1405
1406         mutex_lock(&client->device->client_list_mutex);
1407         list_del(&client->link);
1408         mutex_unlock(&client->device->client_list_mutex);
1409
1410         if (client->iso_context)
1411                 fw_iso_context_destroy(client->iso_context);
1412
1413         if (client->buffer.pages)
1414                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1415
1416         /* Freeze client->resource_idr and client->event_list */
1417         spin_lock_irq(&client->lock);
1418         client->in_shutdown = true;
1419         spin_unlock_irq(&client->lock);
1420
1421         idr_for_each(&client->resource_idr, shutdown_resource, client);
1422         idr_remove_all(&client->resource_idr);
1423         idr_destroy(&client->resource_idr);
1424
1425         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1426                 kfree(e);
1427
1428         client_put(client);
1429
1430         return 0;
1431 }
1432
1433 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1434 {
1435         struct client *client = file->private_data;
1436         unsigned int mask = 0;
1437
1438         poll_wait(file, &client->wait, pt);
1439
1440         if (fw_device_is_shutdown(client->device))
1441                 mask |= POLLHUP | POLLERR;
1442         if (!list_empty(&client->event_list))
1443                 mask |= POLLIN | POLLRDNORM;
1444
1445         return mask;
1446 }
1447
1448 const struct file_operations fw_device_ops = {
1449         .owner          = THIS_MODULE,
1450         .open           = fw_device_op_open,
1451         .read           = fw_device_op_read,
1452         .unlocked_ioctl = fw_device_op_ioctl,
1453         .poll           = fw_device_op_poll,
1454         .release        = fw_device_op_release,
1455         .mmap           = fw_device_op_mmap,
1456
1457 #ifdef CONFIG_COMPAT
1458         .compat_ioctl   = fw_device_op_compat_ioctl,
1459 #endif
1460 };