SAFE public projects git trees. - safe/jmp/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/sched.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/time.h>
  39 #include <linux/uaccess.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/wait.h>
  42 #include <linux/workqueue.h>
  43
  44 #include <asm/system.h>
  45
  46 #include "core.h"
  47
  48 struct client {
  49         u32 version;
  50         struct fw_device *device;
  51
  52         spinlock_t lock;
  53         bool in_shutdown;
  54         struct idr resource_idr;
  55         struct list_head event_list;
  56         wait_queue_head_t wait;
  57         u64 bus_reset_closure;
  58
  59         struct fw_iso_context *iso_context;
  60         u64 iso_closure;
  61         struct fw_iso_buffer buffer;
  62         unsigned long vm_start;
  63
  64         struct list_head link;
  65         struct kref kref;
  66 };
  67
  68 static inline void client_get(struct client *client)
  69 {
  70         kref_get(&client->kref);
  71 }
  72
  73 static void client_release(struct kref *kref)
  74 {
  75         struct client *client = container_of(kref, struct client, kref);
  76
  77         fw_device_put(client->device);
  78         kfree(client);
  79 }
  80
  81 static void client_put(struct client *client)
  82 {
  83         kref_put(&client->kref, client_release);
  84 }
  85
  86 struct client_resource;
  87 typedef void (*client_resource_release_fn_t)(struct client *,
  88                                              struct client_resource *);
  89 struct client_resource {
  90         client_resource_release_fn_t release;
  91         int handle;
  92 };
  93
  94 struct address_handler_resource {
  95         struct client_resource resource;
  96         struct fw_address_handler handler;
  97         __u64 closure;
  98         struct client *client;
  99 };
 100
 101 struct outbound_transaction_resource {
 102         struct client_resource resource;
 103         struct fw_transaction transaction;
 104 };
 105
 106 struct inbound_transaction_resource {
 107         struct client_resource resource;
 108         struct fw_request *request;
 109         void *data;
 110         size_t length;
 111 };
 112
 113 struct descriptor_resource {
 114         struct client_resource resource;
 115         struct fw_descriptor descriptor;
 116         u32 data[0];
 117 };
 118
 119 struct iso_resource {
 120         struct client_resource resource;
 121         struct client *client;
 122         /* Schedule work and access todo only with client->lock held. */
 123         struct delayed_work work;
 124         enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
 125               ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
 126         int generation;
 127         u64 channels;
 128         s32 bandwidth;
 129         __be32 transaction_data[2];
 130         struct iso_resource_event *e_alloc, *e_dealloc;
 131 };
 132
 133 static void schedule_iso_resource(struct iso_resource *);
 134 static void release_iso_resource(struct client *, struct client_resource *);
 135
 136 /*
 137  * dequeue_event() just kfree()'s the event, so the event has to be
 138  * the first field in a struct XYZ_event.
 139  */
 140 struct event {
 141         struct { void *data; size_t size; } v[2];
 142         struct list_head link;
 143 };
 144
 145 struct bus_reset_event {
 146         struct event event;
 147         struct fw_cdev_event_bus_reset reset;
 148 };
 149
 150 struct outbound_transaction_event {
 151         struct event event;
 152         struct client *client;
 153         struct outbound_transaction_resource r;
 154         struct fw_cdev_event_response response;
 155 };
 156
 157 struct inbound_transaction_event {
 158         struct event event;
 159         struct fw_cdev_event_request request;
 160 };
 161
 162 struct iso_interrupt_event {
 163         struct event event;
 164         struct fw_cdev_event_iso_interrupt interrupt;
 165 };
 166
 167 struct iso_resource_event {
 168         struct event event;
 169         struct fw_cdev_event_iso_resource resource;
 170 };
 171
 172 static inline void __user *u64_to_uptr(__u64 value)
 173 {
 174         return (void __user *)(unsigned long)value;
 175 }
 176
 177 static inline __u64 uptr_to_u64(void __user *ptr)
 178 {
 179         return (__u64)(unsigned long)ptr;
 180 }
 181
 182 static int fw_device_op_open(struct inode *inode, struct file *file)
 183 {
 184         struct fw_device *device;
 185         struct client *client;
 186
 187         device = fw_device_get_by_devt(inode->i_rdev);
 188         if (device == NULL)
 189                 return -ENODEV;
 190
 191         if (fw_device_is_shutdown(device)) {
 192                 fw_device_put(device);
 193                 return -ENODEV;
 194         }
 195
 196         client = kzalloc(sizeof(*client), GFP_KERNEL);
 197         if (client == NULL) {
 198                 fw_device_put(device);
 199                 return -ENOMEM;
 200         }
 201
 202         client->device = device;
 203         spin_lock_init(&client->lock);
 204         idr_init(&client->resource_idr);
 205         INIT_LIST_HEAD(&client->event_list);
 206         init_waitqueue_head(&client->wait);
 207         kref_init(&client->kref);
 208
 209         file->private_data = client;
 210
 211         mutex_lock(&device->client_list_mutex);
 212         list_add_tail(&client->link, &device->client_list);
 213         mutex_unlock(&device->client_list_mutex);
 214
 215         return 0;
 216 }
 217
 218 static void queue_event(struct client *client, struct event *event,
 219                         void *data0, size_t size0, void *data1, size_t size1)
 220 {
 221         unsigned long flags;
 222
 223         event->v[0].data = data0;
 224         event->v[0].size = size0;
 225         event->v[1].data = data1;
 226         event->v[1].size = size1;
 227
 228         spin_lock_irqsave(&client->lock, flags);
 229         if (client->in_shutdown)
 230                 kfree(event);
 231         else
 232                 list_add_tail(&event->link, &client->event_list);
 233         spin_unlock_irqrestore(&client->lock, flags);
 234
 235         wake_up_interruptible(&client->wait);
 236 }
 237
 238 static int dequeue_event(struct client *client,
 239                          char __user *buffer, size_t count)
 240 {
 241         struct event *event;
 242         size_t size, total;
 243         int i, ret;
 244
 245         ret = wait_event_interruptible(client->wait,
 246                         !list_empty(&client->event_list) ||
 247                         fw_device_is_shutdown(client->device));
 248         if (ret < 0)
 249                 return ret;
 250
 251         if (list_empty(&client->event_list) &&
 252                        fw_device_is_shutdown(client->device))
 253                 return -ENODEV;
 254
 255         spin_lock_irq(&client->lock);
 256         event = list_first_entry(&client->event_list, struct event, link);
 257         list_del(&event->link);
 258         spin_unlock_irq(&client->lock);
 259
 260         total = 0;
 261         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 262                 size = min(event->v[i].size, count - total);
 263                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 264                         ret = -EFAULT;
 265                         goto out;
 266                 }
 267                 total += size;
 268         }
 269         ret = total;
 270
 271  out:
 272         kfree(event);
 273
 274         return ret;
 275 }
 276
 277 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 278                                  size_t count, loff_t *offset)
 279 {
 280         struct client *client = file->private_data;
 281
 282         return dequeue_event(client, buffer, count);
 283 }
 284
 285 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 286                                  struct client *client)
 287 {
 288         struct fw_card *card = client->device->card;
 289
 290         spin_lock_irq(&card->lock);
 291
 292         event->closure       = client->bus_reset_closure;
 293         event->type          = FW_CDEV_EVENT_BUS_RESET;
 294         event->generation    = client->device->generation;
 295         event->node_id       = client->device->node_id;
 296         event->local_node_id = card->local_node->node_id;
 297         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 298         event->irm_node_id   = card->irm_node->node_id;
 299         event->root_node_id  = card->root_node->node_id;
 300
 301         spin_unlock_irq(&card->lock);
 302 }
 303
 304 static void for_each_client(struct fw_device *device,
 305                             void (*callback)(struct client *client))
 306 {
 307         struct client *c;
 308
 309         mutex_lock(&device->client_list_mutex);
 310         list_for_each_entry(c, &device->client_list, link)
 311                 callback(c);
 312         mutex_unlock(&device->client_list_mutex);
 313 }
 314
 315 static int schedule_reallocations(int id, void *p, void *data)
 316 {
 317         struct client_resource *r = p;
 318
 319         if (r->release == release_iso_resource)
 320                 schedule_iso_resource(container_of(r,
 321                                         struct iso_resource, resource));
 322         return 0;
 323 }
 324
 325 static void queue_bus_reset_event(struct client *client)
 326 {
 327         struct bus_reset_event *e;
 328
 329         e = kzalloc(sizeof(*e), GFP_KERNEL);
 330         if (e == NULL) {
 331                 fw_notify("Out of memory when allocating bus reset event\n");
 332                 return;
 333         }
 334
 335         fill_bus_reset_event(&e->reset, client);
 336
 337         queue_event(client, &e->event,
 338                     &e->reset, sizeof(e->reset), NULL, 0);
 339
 340         spin_lock_irq(&client->lock);
 341         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 342         spin_unlock_irq(&client->lock);
 343 }
 344
 345 void fw_device_cdev_update(struct fw_device *device)
 346 {
 347         for_each_client(device, queue_bus_reset_event);
 348 }
 349
 350 static void wake_up_client(struct client *client)
 351 {
 352         wake_up_interruptible(&client->wait);
 353 }
 354
 355 void fw_device_cdev_remove(struct fw_device *device)
 356 {
 357         for_each_client(device, wake_up_client);
 358 }
 359
 360 static int ioctl_get_info(struct client *client, void *buffer)
 361 {
 362         struct fw_cdev_get_info *get_info = buffer;
 363         struct fw_cdev_event_bus_reset bus_reset;
 364         unsigned long ret = 0;
 365
 366         client->version = get_info->version;
 367         get_info->version = FW_CDEV_VERSION;
 368         get_info->card = client->device->card->index;
 369
 370         down_read(&fw_device_rwsem);
 371
 372         if (get_info->rom != 0) {
 373                 void __user *uptr = u64_to_uptr(get_info->rom);
 374                 size_t want = get_info->rom_length;
 375                 size_t have = client->device->config_rom_length * 4;
 376
 377                 ret = copy_to_user(uptr, client->device->config_rom,
 378                                    min(want, have));
 379         }
 380         get_info->rom_length = client->device->config_rom_length * 4;
 381
 382         up_read(&fw_device_rwsem);
 383
 384         if (ret != 0)
 385                 return -EFAULT;
 386
 387         client->bus_reset_closure = get_info->bus_reset_closure;
 388         if (get_info->bus_reset != 0) {
 389                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 390
 391                 fill_bus_reset_event(&bus_reset, client);
 392                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 393                         return -EFAULT;
 394         }
 395
 396         return 0;
 397 }
 398
 399 static int add_client_resource(struct client *client,
 400                                struct client_resource *resource, gfp_t gfp_mask)
 401 {
 402         unsigned long flags;
 403         int ret;
 404
 405  retry:
 406         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 407                 return -ENOMEM;
 408
 409         spin_lock_irqsave(&client->lock, flags);
 410         if (client->in_shutdown)
 411                 ret = -ECANCELED;
 412         else
 413                 ret = idr_get_new(&client->resource_idr, resource,
 414                                   &resource->handle);
 415         if (ret >= 0) {
 416                 client_get(client);
 417                 if (resource->release == release_iso_resource)
 418                         schedule_iso_resource(container_of(resource,
 419                                                 struct iso_resource, resource));
 420         }
 421         spin_unlock_irqrestore(&client->lock, flags);
 422
 423         if (ret == -EAGAIN)
 424                 goto retry;
 425
 426         return ret < 0 ? ret : 0;
 427 }
 428
 429 static int release_client_resource(struct client *client, u32 handle,
 430                                    client_resource_release_fn_t release,
 431                                    struct client_resource **resource)
 432 {
 433         struct client_resource *r;
 434
 435         spin_lock_irq(&client->lock);
 436         if (client->in_shutdown)
 437                 r = NULL;
 438         else
 439                 r = idr_find(&client->resource_idr, handle);
 440         if (r && r->release == release)
 441                 idr_remove(&client->resource_idr, handle);
 442         spin_unlock_irq(&client->lock);
 443
 444         if (!(r && r->release == release))
 445                 return -EINVAL;
 446
 447         if (resource)
 448                 *resource = r;
 449         else
 450                 r->release(client, r);
 451
 452         client_put(client);
 453
 454         return 0;
 455 }
 456
 457 static void release_transaction(struct client *client,
 458                                 struct client_resource *resource)
 459 {
 460         struct outbound_transaction_resource *r = container_of(resource,
 461                         struct outbound_transaction_resource, resource);
 462
 463         fw_cancel_transaction(client->device->card, &r->transaction);
 464 }
 465
 466 static void complete_transaction(struct fw_card *card, int rcode,
 467                                  void *payload, size_t length, void *data)
 468 {
 469         struct outbound_transaction_event *e = data;
 470         struct fw_cdev_event_response *rsp = &e->response;
 471         struct client *client = e->client;
 472         unsigned long flags;
 473
 474         if (length < rsp->length)
 475                 rsp->length = length;
 476         if (rcode == RCODE_COMPLETE)
 477                 memcpy(rsp->data, payload, rsp->length);
 478
 479         spin_lock_irqsave(&client->lock, flags);
 480         /*
 481          * 1. If called while in shutdown, the idr tree must be left untouched.
 482          *    The idr handle will be removed and the client reference will be
 483          *    dropped later.
 484          * 2. If the call chain was release_client_resource ->
 485          *    release_transaction -> complete_transaction (instead of a normal
 486          *    conclusion of the transaction), i.e. if this resource was already
 487          *    unregistered from the idr, the client reference will be dropped
 488          *    by release_client_resource and we must not drop it here.
 489          */
 490         if (!client->in_shutdown &&
 491             idr_find(&client->resource_idr, e->r.resource.handle)) {
 492                 idr_remove(&client->resource_idr, e->r.resource.handle);
 493                 /* Drop the idr's reference */
 494                 client_put(client);
 495         }
 496         spin_unlock_irqrestore(&client->lock, flags);
 497
 498         rsp->type = FW_CDEV_EVENT_RESPONSE;
 499         rsp->rcode = rcode;
 500
 501         /*
 502          * In the case that sizeof(*rsp) doesn't align with the position of the
 503          * data, and the read is short, preserve an extra copy of the data
 504          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 505          * for short reads and some apps depended on it, this is both safe
 506          * and prudent for compatibility.
 507          */
 508         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 509                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 510                             rsp->data, rsp->length);
 511         else
 512                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 513                             NULL, 0);
 514
 515         /* Drop the transaction callback's reference */
 516         client_put(client);
 517 }
 518
 519 static int init_request(struct client *client,
 520                         struct fw_cdev_send_request *request,
 521                         int destination_id, int speed)
 522 {
 523         struct outbound_transaction_event *e;
 524         int ret;
 525
 526         if (request->tcode != TCODE_STREAM_DATA &&
 527             (request->length > 4096 || request->length > 512 << speed))
 528                 return -EIO;
 529
 530         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 531         if (e == NULL)
 532                 return -ENOMEM;
 533
 534         e->client = client;
 535         e->response.length = request->length;
 536         e->response.closure = request->closure;
 537
 538         if (request->data &&
 539             copy_from_user(e->response.data,
 540                            u64_to_uptr(request->data), request->length)) {
 541                 ret = -EFAULT;
 542                 goto failed;
 543         }
 544
 545         e->r.resource.release = release_transaction;
 546         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 547         if (ret < 0)
 548                 goto failed;
 549
 550         /* Get a reference for the transaction callback */
 551         client_get(client);
 552
 553         fw_send_request(client->device->card, &e->r.transaction,
 554                         request->tcode, destination_id, request->generation,
 555                         speed, request->offset, e->response.data,
 556                         request->length, complete_transaction, e);
 557         return 0;
 558
 559  failed:
 560         kfree(e);
 561
 562         return ret;
 563 }
 564
 565 static int ioctl_send_request(struct client *client, void *buffer)
 566 {
 567         struct fw_cdev_send_request *request = buffer;
 568
 569         switch (request->tcode) {
 570         case TCODE_WRITE_QUADLET_REQUEST:
 571         case TCODE_WRITE_BLOCK_REQUEST:
 572         case TCODE_READ_QUADLET_REQUEST:
 573         case TCODE_READ_BLOCK_REQUEST:
 574         case TCODE_LOCK_MASK_SWAP:
 575         case TCODE_LOCK_COMPARE_SWAP:
 576         case TCODE_LOCK_FETCH_ADD:
 577         case TCODE_LOCK_LITTLE_ADD:
 578         case TCODE_LOCK_BOUNDED_ADD:
 579         case TCODE_LOCK_WRAP_ADD:
 580         case TCODE_LOCK_VENDOR_DEPENDENT:
 581                 break;
 582         default:
 583                 return -EINVAL;
 584         }
 585
 586         return init_request(client, request, client->device->node_id,
 587                             client->device->max_speed);
 588 }
 589
 590 static void release_request(struct client *client,
 591                             struct client_resource *resource)
 592 {
 593         struct inbound_transaction_resource *r = container_of(resource,
 594                         struct inbound_transaction_resource, resource);
 595
 596         fw_send_response(client->device->card, r->request,
 597                          RCODE_CONFLICT_ERROR);
 598         kfree(r);
 599 }
 600
 601 static void handle_request(struct fw_card *card, struct fw_request *request,
 602                            int tcode, int destination, int source,
 603                            int generation, int speed,
 604                            unsigned long long offset,
 605                            void *payload, size_t length, void *callback_data)
 606 {
 607         struct address_handler_resource *handler = callback_data;
 608         struct inbound_transaction_resource *r;
 609         struct inbound_transaction_event *e;
 610         int ret;
 611
 612         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 613         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 614         if (r == NULL || e == NULL)
 615                 goto failed;
 616
 617         r->request = request;
 618         r->data    = payload;
 619         r->length  = length;
 620
 621         r->resource.release = release_request;
 622         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 623         if (ret < 0)
 624                 goto failed;
 625
 626         e->request.type    = FW_CDEV_EVENT_REQUEST;
 627         e->request.tcode   = tcode;
 628         e->request.offset  = offset;
 629         e->request.length  = length;
 630         e->request.handle  = r->resource.handle;
 631         e->request.closure = handler->closure;
 632
 633         queue_event(handler->client, &e->event,
 634                     &e->request, sizeof(e->request), payload, length);
 635         return;
 636
 637  failed:
 638         kfree(r);
 639         kfree(e);
 640         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 641 }
 642
 643 static void release_address_handler(struct client *client,
 644                                     struct client_resource *resource)
 645 {
 646         struct address_handler_resource *r =
 647             container_of(resource, struct address_handler_resource, resource);
 648
 649         fw_core_remove_address_handler(&r->handler);
 650         kfree(r);
 651 }
 652
 653 static int ioctl_allocate(struct client *client, void *buffer)
 654 {
 655         struct fw_cdev_allocate *request = buffer;
 656         struct address_handler_resource *r;
 657         struct fw_address_region region;
 658         int ret;
 659
 660         r = kmalloc(sizeof(*r), GFP_KERNEL);
 661         if (r == NULL)
 662                 return -ENOMEM;
 663
 664         region.start = request->offset;
 665         region.end = request->offset + request->length;
 666         r->handler.length = request->length;
 667         r->handler.address_callback = handle_request;
 668         r->handler.callback_data = r;
 669         r->closure = request->closure;
 670         r->client = client;
 671
 672         ret = fw_core_add_address_handler(&r->handler, &region);
 673         if (ret < 0) {
 674                 kfree(r);
 675                 return ret;
 676         }
 677
 678         r->resource.release = release_address_handler;
 679         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 680         if (ret < 0) {
 681                 release_address_handler(client, &r->resource);
 682                 return ret;
 683         }
 684         request->handle = r->resource.handle;
 685
 686         return 0;
 687 }
 688
 689 static int ioctl_deallocate(struct client *client, void *buffer)
 690 {
 691         struct fw_cdev_deallocate *request = buffer;
 692
 693         return release_client_resource(client, request->handle,
 694                                        release_address_handler, NULL);
 695 }
 696
 697 static int ioctl_send_response(struct client *client, void *buffer)
 698 {
 699         struct fw_cdev_send_response *request = buffer;
 700         struct client_resource *resource;
 701         struct inbound_transaction_resource *r;
 702
 703         if (release_client_resource(client, request->handle,
 704                                     release_request, &resource) < 0)
 705                 return -EINVAL;
 706
 707         r = container_of(resource, struct inbound_transaction_resource,
 708                          resource);
 709         if (request->length < r->length)
 710                 r->length = request->length;
 711         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 712                 return -EFAULT;
 713
 714         fw_send_response(client->device->card, r->request, request->rcode);
 715         kfree(r);
 716
 717         return 0;
 718 }
 719
 720 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 721 {
 722         struct fw_cdev_initiate_bus_reset *request = buffer;
 723         int short_reset;
 724
 725         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 726
 727         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 728 }
 729
 730 static void release_descriptor(struct client *client,
 731                                struct client_resource *resource)
 732 {
 733         struct descriptor_resource *r =
 734                 container_of(resource, struct descriptor_resource, resource);
 735
 736         fw_core_remove_descriptor(&r->descriptor);
 737         kfree(r);
 738 }
 739
 740 static int ioctl_add_descriptor(struct client *client, void *buffer)
 741 {
 742         struct fw_cdev_add_descriptor *request = buffer;
 743         struct descriptor_resource *r;
 744         int ret;
 745
 746         /* Access policy: Allow this ioctl only on local nodes' device files. */
 747         if (!client->device->is_local)
 748                 return -ENOSYS;
 749
 750         if (request->length > 256)
 751                 return -EINVAL;
 752
 753         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 754         if (r == NULL)
 755                 return -ENOMEM;
 756
 757         if (copy_from_user(r->data,
 758                            u64_to_uptr(request->data), request->length * 4)) {
 759                 ret = -EFAULT;
 760                 goto failed;
 761         }
 762
 763         r->descriptor.length    = request->length;
 764         r->descriptor.immediate = request->immediate;
 765         r->descriptor.key       = request->key;
 766         r->descriptor.data      = r->data;
 767
 768         ret = fw_core_add_descriptor(&r->descriptor);
 769         if (ret < 0)
 770                 goto failed;
 771
 772         r->resource.release = release_descriptor;
 773         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 774         if (ret < 0) {
 775                 fw_core_remove_descriptor(&r->descriptor);
 776                 goto failed;
 777         }
 778         request->handle = r->resource.handle;
 779
 780         return 0;
 781  failed:
 782         kfree(r);
 783
 784         return ret;
 785 }
 786
 787 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 788 {
 789         struct fw_cdev_remove_descriptor *request = buffer;
 790
 791         return release_client_resource(client, request->handle,
 792                                        release_descriptor, NULL);
 793 }
 794
 795 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 796                          size_t header_length, void *header, void *data)
 797 {
 798         struct client *client = data;
 799         struct iso_interrupt_event *e;
 800
 801         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 802         if (e == NULL)
 803                 return;
 804
 805         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 806         e->interrupt.closure   = client->iso_closure;
 807         e->interrupt.cycle     = cycle;
 808         e->interrupt.header_length = header_length;
 809         memcpy(e->interrupt.header, header, header_length);
 810         queue_event(client, &e->event, &e->interrupt,
 811                     sizeof(e->interrupt) + header_length, NULL, 0);
 812 }
 813
 814 static int ioctl_create_iso_context(struct client *client, void *buffer)
 815 {
 816         struct fw_cdev_create_iso_context *request = buffer;
 817         struct fw_iso_context *context;
 818
 819         /* We only support one context at this time. */
 820         if (client->iso_context != NULL)
 821                 return -EBUSY;
 822
 823         if (request->channel > 63)
 824                 return -EINVAL;
 825
 826         switch (request->type) {
 827         case FW_ISO_CONTEXT_RECEIVE:
 828                 if (request->header_size < 4 || (request->header_size & 3))
 829                         return -EINVAL;
 830
 831                 break;
 832
 833         case FW_ISO_CONTEXT_TRANSMIT:
 834                 if (request->speed > SCODE_3200)
 835                         return -EINVAL;
 836
 837                 break;
 838
 839         default:
 840                 return -EINVAL;
 841         }
 842
 843         context =  fw_iso_context_create(client->device->card,
 844                                          request->type,
 845                                          request->channel,
 846                                          request->speed,
 847                                          request->header_size,
 848                                          iso_callback, client);
 849         if (IS_ERR(context))
 850                 return PTR_ERR(context);
 851
 852         client->iso_closure = request->closure;
 853         client->iso_context = context;
 854
 855         /* We only support one context at this time. */
 856         request->handle = 0;
 857
 858         return 0;
 859 }
 860
 861 /* Macros for decoding the iso packet control header. */
 862 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 863 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 864 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 865 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 866 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 867 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 868
 869 static int ioctl_queue_iso(struct client *client, void *buffer)
 870 {
 871         struct fw_cdev_queue_iso *request = buffer;
 872         struct fw_cdev_iso_packet __user *p, *end, *next;
 873         struct fw_iso_context *ctx = client->iso_context;
 874         unsigned long payload, buffer_end, header_length;
 875         u32 control;
 876         int count;
 877         struct {
 878                 struct fw_iso_packet packet;
 879                 u8 header[256];
 880         } u;
 881
 882         if (ctx == NULL || request->handle != 0)
 883                 return -EINVAL;
 884
 885         /*
 886          * If the user passes a non-NULL data pointer, has mmap()'ed
 887          * the iso buffer, and the pointer points inside the buffer,
 888          * we setup the payload pointers accordingly.  Otherwise we
 889          * set them both to 0, which will still let packets with
 890          * payload_length == 0 through.  In other words, if no packets
 891          * use the indirect payload, the iso buffer need not be mapped
 892          * and the request->data pointer is ignored.
 893          */
 894
 895         payload = (unsigned long)request->data - client->vm_start;
 896         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 897         if (request->data == 0 || client->buffer.pages == NULL ||
 898             payload >= buffer_end) {
 899                 payload = 0;
 900                 buffer_end = 0;
 901         }
 902
 903         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 904
 905         if (!access_ok(VERIFY_READ, p, request->size))
 906                 return -EFAULT;
 907
 908         end = (void __user *)p + request->size;
 909         count = 0;
 910         while (p < end) {
 911                 if (get_user(control, &p->control))
 912                         return -EFAULT;
 913                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 914                 u.packet.interrupt = GET_INTERRUPT(control);
 915                 u.packet.skip = GET_SKIP(control);
 916                 u.packet.tag = GET_TAG(control);
 917                 u.packet.sy = GET_SY(control);
 918                 u.packet.header_length = GET_HEADER_LENGTH(control);
 919
 920                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 921                         header_length = u.packet.header_length;
 922                 } else {
 923                         /*
 924                          * We require that header_length is a multiple of
 925                          * the fixed header size, ctx->header_size.
 926                          */
 927                         if (ctx->header_size == 0) {
 928                                 if (u.packet.header_length > 0)
 929                                         return -EINVAL;
 930                         } else if (u.packet.header_length % ctx->header_size != 0) {
 931                                 return -EINVAL;
 932                         }
 933                         header_length = 0;
 934                 }
 935
 936                 next = (struct fw_cdev_iso_packet __user *)
 937                         &p->header[header_length / 4];
 938                 if (next > end)
 939                         return -EINVAL;
 940                 if (__copy_from_user
 941                     (u.packet.header, p->header, header_length))
 942                         return -EFAULT;
 943                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 944                     u.packet.header_length + u.packet.payload_length > 0)
 945                         return -EINVAL;
 946                 if (payload + u.packet.payload_length > buffer_end)
 947                         return -EINVAL;
 948
 949                 if (fw_iso_context_queue(ctx, &u.packet,
 950                                          &client->buffer, payload))
 951                         break;
 952
 953                 p = next;
 954                 payload += u.packet.payload_length;
 955                 count++;
 956         }
 957
 958         request->size    -= uptr_to_u64(p) - request->packets;
 959         request->packets  = uptr_to_u64(p);
 960         request->data     = client->vm_start + payload;
 961
 962         return count;
 963 }
 964
 965 static int ioctl_start_iso(struct client *client, void *buffer)
 966 {
 967         struct fw_cdev_start_iso *request = buffer;
 968
 969         if (client->iso_context == NULL || request->handle != 0)
 970                 return -EINVAL;
 971
 972         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 973                 if (request->tags == 0 || request->tags > 15)
 974                         return -EINVAL;
 975
 976                 if (request->sync > 15)
 977                         return -EINVAL;
 978         }
 979
 980         return fw_iso_context_start(client->iso_context, request->cycle,
 981                                     request->sync, request->tags);
 982 }
 983
 984 static int ioctl_stop_iso(struct client *client, void *buffer)
 985 {
 986         struct fw_cdev_stop_iso *request = buffer;
 987
 988         if (client->iso_context == NULL || request->handle != 0)
 989                 return -EINVAL;
 990
 991         return fw_iso_context_stop(client->iso_context);
 992 }
 993
 994 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 995 {
 996         struct fw_cdev_get_cycle_timer *request = buffer;
 997         struct fw_card *card = client->device->card;
 998         unsigned long long bus_time;
 999         struct timeval tv;
1000         unsigned long flags;
1001
1002         preempt_disable();
1003         local_irq_save(flags);
1004
1005         bus_time = card->driver->get_bus_time(card);
1006         do_gettimeofday(&tv);
1007
1008         local_irq_restore(flags);
1009         preempt_enable();
1010
1011         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1012         request->cycle_timer = bus_time & 0xffffffff;
1013         return 0;
1014 }
1015
1016 static void iso_resource_work(struct work_struct *work)
1017 {
1018         struct iso_resource_event *e;
1019         struct iso_resource *r =
1020                         container_of(work, struct iso_resource, work.work);
1021         struct client *client = r->client;
1022         int generation, channel, bandwidth, todo;
1023         bool skip, free, success;
1024
1025         spin_lock_irq(&client->lock);
1026         generation = client->device->generation;
1027         todo = r->todo;
1028         /* Allow 1000ms grace period for other reallocations. */
1029         if (todo == ISO_RES_ALLOC &&
1030             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1031                 if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
1032                         client_get(client);
1033                 skip = true;
1034         } else {
1035                 /* We could be called twice within the same generation. */
1036                 skip = todo == ISO_RES_REALLOC &&
1037                        r->generation == generation;
1038         }
1039         free = todo == ISO_RES_DEALLOC ||
1040                todo == ISO_RES_ALLOC_ONCE ||
1041                todo == ISO_RES_DEALLOC_ONCE;
1042         r->generation = generation;
1043         spin_unlock_irq(&client->lock);
1044
1045         if (skip)
1046                 goto out;
1047
1048         bandwidth = r->bandwidth;
1049
1050         fw_iso_resource_manage(client->device->card, generation,
1051                         r->channels, &channel, &bandwidth,
1052                         todo == ISO_RES_ALLOC ||
1053                         todo == ISO_RES_REALLOC ||
1054                         todo == ISO_RES_ALLOC_ONCE,
1055                         r->transaction_data);
1056         /*
1057          * Is this generation outdated already?  As long as this resource sticks
1058          * in the idr, it will be scheduled again for a newer generation or at
1059          * shutdown.
1060          */
1061         if (channel == -EAGAIN &&
1062             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1063                 goto out;
1064
1065         success = channel >= 0 || bandwidth > 0;
1066
1067         spin_lock_irq(&client->lock);
1068         /*
1069          * Transit from allocation to reallocation, except if the client
1070          * requested deallocation in the meantime.
1071          */
1072         if (r->todo == ISO_RES_ALLOC)
1073                 r->todo = ISO_RES_REALLOC;
1074         /*
1075          * Allocation or reallocation failure?  Pull this resource out of the
1076          * idr and prepare for deletion, unless the client is shutting down.
1077          */
1078         if (r->todo == ISO_RES_REALLOC && !success &&
1079             !client->in_shutdown &&
1080             idr_find(&client->resource_idr, r->resource.handle)) {
1081                 idr_remove(&client->resource_idr, r->resource.handle);
1082                 client_put(client);
1083                 free = true;
1084         }
1085         spin_unlock_irq(&client->lock);
1086
1087         if (todo == ISO_RES_ALLOC && channel >= 0)
1088                 r->channels = 1ULL << channel;
1089
1090         if (todo == ISO_RES_REALLOC && success)
1091                 goto out;
1092
1093         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1094                 e = r->e_alloc;
1095                 r->e_alloc = NULL;
1096         } else {
1097                 e = r->e_dealloc;
1098                 r->e_dealloc = NULL;
1099         }
1100         e->resource.handle      = r->resource.handle;
1101         e->resource.channel     = channel;
1102         e->resource.bandwidth   = bandwidth;
1103
1104         queue_event(client, &e->event,
1105                     &e->resource, sizeof(e->resource), NULL, 0);
1106
1107         if (free) {
1108                 cancel_delayed_work(&r->work);
1109                 kfree(r->e_alloc);
1110                 kfree(r->e_dealloc);
1111                 kfree(r);
1112         }
1113  out:
1114         client_put(client);
1115 }
1116
1117 static void schedule_iso_resource(struct iso_resource *r)
1118 {
1119         client_get(r->client);
1120         if (!schedule_delayed_work(&r->work, 0))
1121                 client_put(r->client);
1122 }
1123
1124 static void release_iso_resource(struct client *client,
1125                                  struct client_resource *resource)
1126 {
1127         struct iso_resource *r =
1128                 container_of(resource, struct iso_resource, resource);
1129
1130         spin_lock_irq(&client->lock);
1131         r->todo = ISO_RES_DEALLOC;
1132         schedule_iso_resource(r);
1133         spin_unlock_irq(&client->lock);
1134 }
1135
1136 static int init_iso_resource(struct client *client,
1137                 struct fw_cdev_allocate_iso_resource *request, int todo)
1138 {
1139         struct iso_resource_event *e1, *e2;
1140         struct iso_resource *r;
1141         int ret;
1142
1143         if ((request->channels == 0 && request->bandwidth == 0) ||
1144             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1145             request->bandwidth < 0)
1146                 return -EINVAL;
1147
1148         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1149         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1150         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1151         if (r == NULL || e1 == NULL || e2 == NULL) {
1152                 ret = -ENOMEM;
1153                 goto fail;
1154         }
1155
1156         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1157         r->client       = client;
1158         r->todo         = todo;
1159         r->generation   = -1;
1160         r->channels     = request->channels;
1161         r->bandwidth    = request->bandwidth;
1162         r->e_alloc      = e1;
1163         r->e_dealloc    = e2;
1164
1165         e1->resource.closure    = request->closure;
1166         e1->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1167         e2->resource.closure    = request->closure;
1168         e2->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1169
1170         if (todo == ISO_RES_ALLOC) {
1171                 r->resource.release = release_iso_resource;
1172                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1173                 if (ret < 0)
1174                         goto fail;
1175         } else {
1176                 r->resource.release = NULL;
1177                 r->resource.handle = -1;
1178                 schedule_iso_resource(r);
1179         }
1180         request->handle = r->resource.handle;
1181
1182         return 0;
1183  fail:
1184         kfree(r);
1185         kfree(e1);
1186         kfree(e2);
1187
1188         return ret;
1189 }
1190
1191 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1192 {
1193         struct fw_cdev_allocate_iso_resource *request = buffer;
1194
1195         return init_iso_resource(client, request, ISO_RES_ALLOC);
1196 }
1197
1198 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1199 {
1200         struct fw_cdev_deallocate *request = buffer;
1201
1202         return release_client_resource(client, request->handle,
1203                                        release_iso_resource, NULL);
1204 }
1205
1206 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1207 {
1208         struct fw_cdev_allocate_iso_resource *request = buffer;
1209
1210         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1211 }
1212
1213 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1214 {
1215         struct fw_cdev_allocate_iso_resource *request = buffer;
1216
1217         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1218 }
1219
1220 /*
1221  * Returns a speed code:  Maximum speed to or from this device,
1222  * limited by the device's link speed, the local node's link speed,
1223  * and all PHY port speeds between the two links.
1224  */
1225 static int ioctl_get_speed(struct client *client, void *buffer)
1226 {
1227         return client->device->max_speed;
1228 }
1229
1230 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1231 {
1232         struct fw_cdev_send_request *request = buffer;
1233
1234         switch (request->tcode) {
1235         case TCODE_WRITE_QUADLET_REQUEST:
1236         case TCODE_WRITE_BLOCK_REQUEST:
1237                 break;
1238         default:
1239                 return -EINVAL;
1240         }
1241
1242         /* Security policy: Only allow accesses to Units Space. */
1243         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1244                 return -EACCES;
1245
1246         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1247 }
1248
1249 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1250 {
1251         struct fw_cdev_send_stream_packet *p = buffer;
1252         struct fw_cdev_send_request request;
1253         int dest;
1254
1255         if (p->speed > client->device->card->link_speed ||
1256             p->length > 1024 << p->speed)
1257                 return -EIO;
1258
1259         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1260                 return -EINVAL;
1261
1262         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1263         request.tcode           = TCODE_STREAM_DATA;
1264         request.length          = p->length;
1265         request.closure         = p->closure;
1266         request.data            = p->data;
1267         request.generation      = p->generation;
1268
1269         return init_request(client, &request, dest, p->speed);
1270 }
1271
1272 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1273         ioctl_get_info,
1274         ioctl_send_request,
1275         ioctl_allocate,
1276         ioctl_deallocate,
1277         ioctl_send_response,
1278         ioctl_initiate_bus_reset,
1279         ioctl_add_descriptor,
1280         ioctl_remove_descriptor,
1281         ioctl_create_iso_context,
1282         ioctl_queue_iso,
1283         ioctl_start_iso,
1284         ioctl_stop_iso,
1285         ioctl_get_cycle_timer,
1286         ioctl_allocate_iso_resource,
1287         ioctl_deallocate_iso_resource,
1288         ioctl_allocate_iso_resource_once,
1289         ioctl_deallocate_iso_resource_once,
1290         ioctl_get_speed,
1291         ioctl_send_broadcast_request,
1292         ioctl_send_stream_packet,
1293 };
1294
1295 static int dispatch_ioctl(struct client *client,
1296                           unsigned int cmd, void __user *arg)
1297 {
1298         char buffer[256];
1299         int ret;
1300
1301         if (_IOC_TYPE(cmd) != '#' ||
1302             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1303                 return -EINVAL;
1304
1305         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1306                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1307                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1308                         return -EFAULT;
1309         }
1310
1311         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1312         if (ret < 0)
1313                 return ret;
1314
1315         if (_IOC_DIR(cmd) & _IOC_READ) {
1316                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1317                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1318                         return -EFAULT;
1319         }
1320
1321         return ret;
1322 }
1323
1324 static long fw_device_op_ioctl(struct file *file,
1325                                unsigned int cmd, unsigned long arg)
1326 {
1327         struct client *client = file->private_data;
1328
1329         if (fw_device_is_shutdown(client->device))
1330                 return -ENODEV;
1331
1332         return dispatch_ioctl(client, cmd, (void __user *) arg);
1333 }
1334
1335 #ifdef CONFIG_COMPAT
1336 static long fw_device_op_compat_ioctl(struct file *file,
1337                                       unsigned int cmd, unsigned long arg)
1338 {
1339         struct client *client = file->private_data;
1340
1341         if (fw_device_is_shutdown(client->device))
1342                 return -ENODEV;
1343
1344         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1345 }
1346 #endif
1347
1348 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1349 {
1350         struct client *client = file->private_data;
1351         enum dma_data_direction direction;
1352         unsigned long size;
1353         int page_count, ret;
1354
1355         if (fw_device_is_shutdown(client->device))
1356                 return -ENODEV;
1357
1358         /* FIXME: We could support multiple buffers, but we don't. */
1359         if (client->buffer.pages != NULL)
1360                 return -EBUSY;
1361
1362         if (!(vma->vm_flags & VM_SHARED))
1363                 return -EINVAL;
1364
1365         if (vma->vm_start & ~PAGE_MASK)
1366                 return -EINVAL;
1367
1368         client->vm_start = vma->vm_start;
1369         size = vma->vm_end - vma->vm_start;
1370         page_count = size >> PAGE_SHIFT;
1371         if (size & ~PAGE_MASK)
1372                 return -EINVAL;
1373
1374         if (vma->vm_flags & VM_WRITE)
1375                 direction = DMA_TO_DEVICE;
1376         else
1377                 direction = DMA_FROM_DEVICE;
1378
1379         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1380                                  page_count, direction);
1381         if (ret < 0)
1382                 return ret;
1383
1384         ret = fw_iso_buffer_map(&client->buffer, vma);
1385         if (ret < 0)
1386                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1387
1388         return ret;
1389 }
1390
1391 static int shutdown_resource(int id, void *p, void *data)
1392 {
1393         struct client_resource *r = p;
1394         struct client *client = data;
1395
1396         r->release(client, r);
1397         client_put(client);
1398
1399         return 0;
1400 }
1401
1402 static int fw_device_op_release(struct inode *inode, struct file *file)
1403 {
1404         struct client *client = file->private_data;
1405         struct event *e, *next_e;
1406
1407         mutex_lock(&client->device->client_list_mutex);
1408         list_del(&client->link);
1409         mutex_unlock(&client->device->client_list_mutex);
1410
1411         if (client->iso_context)
1412                 fw_iso_context_destroy(client->iso_context);
1413
1414         if (client->buffer.pages)
1415                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1416
1417         /* Freeze client->resource_idr and client->event_list */
1418         spin_lock_irq(&client->lock);
1419         client->in_shutdown = true;
1420         spin_unlock_irq(&client->lock);
1421
1422         idr_for_each(&client->resource_idr, shutdown_resource, client);
1423         idr_remove_all(&client->resource_idr);
1424         idr_destroy(&client->resource_idr);
1425
1426         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1427                 kfree(e);
1428
1429         client_put(client);
1430
1431         return 0;
1432 }
1433
1434 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1435 {
1436         struct client *client = file->private_data;
1437         unsigned int mask = 0;
1438
1439         poll_wait(file, &client->wait, pt);
1440
1441         if (fw_device_is_shutdown(client->device))
1442                 mask |= POLLHUP | POLLERR;
1443         if (!list_empty(&client->event_list))
1444                 mask |= POLLIN | POLLRDNORM;
1445
1446         return mask;
1447 }
1448
1449 const struct file_operations fw_device_ops = {
1450         .owner          = THIS_MODULE,
1451         .open           = fw_device_op_open,
1452         .read           = fw_device_op_read,
1453         .unlocked_ioctl = fw_device_op_ioctl,
1454         .poll           = fw_device_op_poll,
1455         .release        = fw_device_op_release,
1456         .mmap           = fw_device_op_mmap,
1457
1458 #ifdef CONFIG_COMPAT
1459         .compat_ioctl   = fw_device_op_compat_ioctl,
1460 #endif
1461 };