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/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 release_iso_resource(struct client *, struct client_resource *);
 133
 134 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
 135 {
 136         client_get(r->client);
 137         if (!schedule_delayed_work(&r->work, delay))
 138                 client_put(r->client);
 139 }
 140
 141 static void schedule_if_iso_resource(struct client_resource *resource)
 142 {
 143         if (resource->release == release_iso_resource)
 144                 schedule_iso_resource(container_of(resource,
 145                                         struct iso_resource, resource), 0);
 146 }
 147
 148 /*
 149  * dequeue_event() just kfree()'s the event, so the event has to be
 150  * the first field in a struct XYZ_event.
 151  */
 152 struct event {
 153         struct { void *data; size_t size; } v[2];
 154         struct list_head link;
 155 };
 156
 157 struct bus_reset_event {
 158         struct event event;
 159         struct fw_cdev_event_bus_reset reset;
 160 };
 161
 162 struct outbound_transaction_event {
 163         struct event event;
 164         struct client *client;
 165         struct outbound_transaction_resource r;
 166         struct fw_cdev_event_response response;
 167 };
 168
 169 struct inbound_transaction_event {
 170         struct event event;
 171         struct fw_cdev_event_request request;
 172 };
 173
 174 struct iso_interrupt_event {
 175         struct event event;
 176         struct fw_cdev_event_iso_interrupt interrupt;
 177 };
 178
 179 struct iso_resource_event {
 180         struct event event;
 181         struct fw_cdev_event_iso_resource resource;
 182 };
 183
 184 static inline void __user *u64_to_uptr(__u64 value)
 185 {
 186         return (void __user *)(unsigned long)value;
 187 }
 188
 189 static inline __u64 uptr_to_u64(void __user *ptr)
 190 {
 191         return (__u64)(unsigned long)ptr;
 192 }
 193
 194 static int fw_device_op_open(struct inode *inode, struct file *file)
 195 {
 196         struct fw_device *device;
 197         struct client *client;
 198
 199         device = fw_device_get_by_devt(inode->i_rdev);
 200         if (device == NULL)
 201                 return -ENODEV;
 202
 203         if (fw_device_is_shutdown(device)) {
 204                 fw_device_put(device);
 205                 return -ENODEV;
 206         }
 207
 208         client = kzalloc(sizeof(*client), GFP_KERNEL);
 209         if (client == NULL) {
 210                 fw_device_put(device);
 211                 return -ENOMEM;
 212         }
 213
 214         client->device = device;
 215         spin_lock_init(&client->lock);
 216         idr_init(&client->resource_idr);
 217         INIT_LIST_HEAD(&client->event_list);
 218         init_waitqueue_head(&client->wait);
 219         kref_init(&client->kref);
 220
 221         file->private_data = client;
 222
 223         mutex_lock(&device->client_list_mutex);
 224         list_add_tail(&client->link, &device->client_list);
 225         mutex_unlock(&device->client_list_mutex);
 226
 227         return 0;
 228 }
 229
 230 static void queue_event(struct client *client, struct event *event,
 231                         void *data0, size_t size0, void *data1, size_t size1)
 232 {
 233         unsigned long flags;
 234
 235         event->v[0].data = data0;
 236         event->v[0].size = size0;
 237         event->v[1].data = data1;
 238         event->v[1].size = size1;
 239
 240         spin_lock_irqsave(&client->lock, flags);
 241         if (client->in_shutdown)
 242                 kfree(event);
 243         else
 244                 list_add_tail(&event->link, &client->event_list);
 245         spin_unlock_irqrestore(&client->lock, flags);
 246
 247         wake_up_interruptible(&client->wait);
 248 }
 249
 250 static int dequeue_event(struct client *client,
 251                          char __user *buffer, size_t count)
 252 {
 253         struct event *event;
 254         size_t size, total;
 255         int i, ret;
 256
 257         ret = wait_event_interruptible(client->wait,
 258                         !list_empty(&client->event_list) ||
 259                         fw_device_is_shutdown(client->device));
 260         if (ret < 0)
 261                 return ret;
 262
 263         if (list_empty(&client->event_list) &&
 264                        fw_device_is_shutdown(client->device))
 265                 return -ENODEV;
 266
 267         spin_lock_irq(&client->lock);
 268         event = list_first_entry(&client->event_list, struct event, link);
 269         list_del(&event->link);
 270         spin_unlock_irq(&client->lock);
 271
 272         total = 0;
 273         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 274                 size = min(event->v[i].size, count - total);
 275                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 276                         ret = -EFAULT;
 277                         goto out;
 278                 }
 279                 total += size;
 280         }
 281         ret = total;
 282
 283  out:
 284         kfree(event);
 285
 286         return ret;
 287 }
 288
 289 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 290                                  size_t count, loff_t *offset)
 291 {
 292         struct client *client = file->private_data;
 293
 294         return dequeue_event(client, buffer, count);
 295 }
 296
 297 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 298                                  struct client *client)
 299 {
 300         struct fw_card *card = client->device->card;
 301
 302         spin_lock_irq(&card->lock);
 303
 304         event->closure       = client->bus_reset_closure;
 305         event->type          = FW_CDEV_EVENT_BUS_RESET;
 306         event->generation    = client->device->generation;
 307         event->node_id       = client->device->node_id;
 308         event->local_node_id = card->local_node->node_id;
 309         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 310         event->irm_node_id   = card->irm_node->node_id;
 311         event->root_node_id  = card->root_node->node_id;
 312
 313         spin_unlock_irq(&card->lock);
 314 }
 315
 316 static void for_each_client(struct fw_device *device,
 317                             void (*callback)(struct client *client))
 318 {
 319         struct client *c;
 320
 321         mutex_lock(&device->client_list_mutex);
 322         list_for_each_entry(c, &device->client_list, link)
 323                 callback(c);
 324         mutex_unlock(&device->client_list_mutex);
 325 }
 326
 327 static int schedule_reallocations(int id, void *p, void *data)
 328 {
 329         schedule_if_iso_resource(p);
 330
 331         return 0;
 332 }
 333
 334 static void queue_bus_reset_event(struct client *client)
 335 {
 336         struct bus_reset_event *e;
 337
 338         e = kzalloc(sizeof(*e), GFP_KERNEL);
 339         if (e == NULL) {
 340                 fw_notify("Out of memory when allocating bus reset event\n");
 341                 return;
 342         }
 343
 344         fill_bus_reset_event(&e->reset, client);
 345
 346         queue_event(client, &e->event,
 347                     &e->reset, sizeof(e->reset), NULL, 0);
 348
 349         spin_lock_irq(&client->lock);
 350         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 351         spin_unlock_irq(&client->lock);
 352 }
 353
 354 void fw_device_cdev_update(struct fw_device *device)
 355 {
 356         for_each_client(device, queue_bus_reset_event);
 357 }
 358
 359 static void wake_up_client(struct client *client)
 360 {
 361         wake_up_interruptible(&client->wait);
 362 }
 363
 364 void fw_device_cdev_remove(struct fw_device *device)
 365 {
 366         for_each_client(device, wake_up_client);
 367 }
 368
 369 static int ioctl_get_info(struct client *client, void *buffer)
 370 {
 371         struct fw_cdev_get_info *get_info = buffer;
 372         struct fw_cdev_event_bus_reset bus_reset;
 373         unsigned long ret = 0;
 374
 375         client->version = get_info->version;
 376         get_info->version = FW_CDEV_VERSION;
 377         get_info->card = client->device->card->index;
 378
 379         down_read(&fw_device_rwsem);
 380
 381         if (get_info->rom != 0) {
 382                 void __user *uptr = u64_to_uptr(get_info->rom);
 383                 size_t want = get_info->rom_length;
 384                 size_t have = client->device->config_rom_length * 4;
 385
 386                 ret = copy_to_user(uptr, client->device->config_rom,
 387                                    min(want, have));
 388         }
 389         get_info->rom_length = client->device->config_rom_length * 4;
 390
 391         up_read(&fw_device_rwsem);
 392
 393         if (ret != 0)
 394                 return -EFAULT;
 395
 396         client->bus_reset_closure = get_info->bus_reset_closure;
 397         if (get_info->bus_reset != 0) {
 398                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 399
 400                 fill_bus_reset_event(&bus_reset, client);
 401                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 402                         return -EFAULT;
 403         }
 404
 405         return 0;
 406 }
 407
 408 static int add_client_resource(struct client *client,
 409                                struct client_resource *resource, gfp_t gfp_mask)
 410 {
 411         unsigned long flags;
 412         int ret;
 413
 414  retry:
 415         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 416                 return -ENOMEM;
 417
 418         spin_lock_irqsave(&client->lock, flags);
 419         if (client->in_shutdown)
 420                 ret = -ECANCELED;
 421         else
 422                 ret = idr_get_new(&client->resource_idr, resource,
 423                                   &resource->handle);
 424         if (ret >= 0) {
 425                 client_get(client);
 426                 schedule_if_iso_resource(resource);
 427         }
 428         spin_unlock_irqrestore(&client->lock, flags);
 429
 430         if (ret == -EAGAIN)
 431                 goto retry;
 432
 433         return ret < 0 ? ret : 0;
 434 }
 435
 436 static int release_client_resource(struct client *client, u32 handle,
 437                                    client_resource_release_fn_t release,
 438                                    struct client_resource **resource)
 439 {
 440         struct client_resource *r;
 441
 442         spin_lock_irq(&client->lock);
 443         if (client->in_shutdown)
 444                 r = NULL;
 445         else
 446                 r = idr_find(&client->resource_idr, handle);
 447         if (r && r->release == release)
 448                 idr_remove(&client->resource_idr, handle);
 449         spin_unlock_irq(&client->lock);
 450
 451         if (!(r && r->release == release))
 452                 return -EINVAL;
 453
 454         if (resource)
 455                 *resource = r;
 456         else
 457                 r->release(client, r);
 458
 459         client_put(client);
 460
 461         return 0;
 462 }
 463
 464 static void release_transaction(struct client *client,
 465                                 struct client_resource *resource)
 466 {
 467         struct outbound_transaction_resource *r = container_of(resource,
 468                         struct outbound_transaction_resource, resource);
 469
 470         fw_cancel_transaction(client->device->card, &r->transaction);
 471 }
 472
 473 static void complete_transaction(struct fw_card *card, int rcode,
 474                                  void *payload, size_t length, void *data)
 475 {
 476         struct outbound_transaction_event *e = data;
 477         struct fw_cdev_event_response *rsp = &e->response;
 478         struct client *client = e->client;
 479         unsigned long flags;
 480
 481         if (length < rsp->length)
 482                 rsp->length = length;
 483         if (rcode == RCODE_COMPLETE)
 484                 memcpy(rsp->data, payload, rsp->length);
 485
 486         spin_lock_irqsave(&client->lock, flags);
 487         /*
 488          * 1. If called while in shutdown, the idr tree must be left untouched.
 489          *    The idr handle will be removed and the client reference will be
 490          *    dropped later.
 491          * 2. If the call chain was release_client_resource ->
 492          *    release_transaction -> complete_transaction (instead of a normal
 493          *    conclusion of the transaction), i.e. if this resource was already
 494          *    unregistered from the idr, the client reference will be dropped
 495          *    by release_client_resource and we must not drop it here.
 496          */
 497         if (!client->in_shutdown &&
 498             idr_find(&client->resource_idr, e->r.resource.handle)) {
 499                 idr_remove(&client->resource_idr, e->r.resource.handle);
 500                 /* Drop the idr's reference */
 501                 client_put(client);
 502         }
 503         spin_unlock_irqrestore(&client->lock, flags);
 504
 505         rsp->type = FW_CDEV_EVENT_RESPONSE;
 506         rsp->rcode = rcode;
 507
 508         /*
 509          * In the case that sizeof(*rsp) doesn't align with the position of the
 510          * data, and the read is short, preserve an extra copy of the data
 511          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 512          * for short reads and some apps depended on it, this is both safe
 513          * and prudent for compatibility.
 514          */
 515         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 516                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 517                             rsp->data, rsp->length);
 518         else
 519                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 520                             NULL, 0);
 521
 522         /* Drop the transaction callback's reference */
 523         client_put(client);
 524 }
 525
 526 static int init_request(struct client *client,
 527                         struct fw_cdev_send_request *request,
 528                         int destination_id, int speed)
 529 {
 530         struct outbound_transaction_event *e;
 531         int ret;
 532
 533         if (request->tcode != TCODE_STREAM_DATA &&
 534             (request->length > 4096 || request->length > 512 << speed))
 535                 return -EIO;
 536
 537         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 538         if (e == NULL)
 539                 return -ENOMEM;
 540
 541         e->client = client;
 542         e->response.length = request->length;
 543         e->response.closure = request->closure;
 544
 545         if (request->data &&
 546             copy_from_user(e->response.data,
 547                            u64_to_uptr(request->data), request->length)) {
 548                 ret = -EFAULT;
 549                 goto failed;
 550         }
 551
 552         e->r.resource.release = release_transaction;
 553         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 554         if (ret < 0)
 555                 goto failed;
 556
 557         /* Get a reference for the transaction callback */
 558         client_get(client);
 559
 560         fw_send_request(client->device->card, &e->r.transaction,
 561                         request->tcode, destination_id, request->generation,
 562                         speed, request->offset, e->response.data,
 563                         request->length, complete_transaction, e);
 564         return 0;
 565
 566  failed:
 567         kfree(e);
 568
 569         return ret;
 570 }
 571
 572 static int ioctl_send_request(struct client *client, void *buffer)
 573 {
 574         struct fw_cdev_send_request *request = buffer;
 575
 576         switch (request->tcode) {
 577         case TCODE_WRITE_QUADLET_REQUEST:
 578         case TCODE_WRITE_BLOCK_REQUEST:
 579         case TCODE_READ_QUADLET_REQUEST:
 580         case TCODE_READ_BLOCK_REQUEST:
 581         case TCODE_LOCK_MASK_SWAP:
 582         case TCODE_LOCK_COMPARE_SWAP:
 583         case TCODE_LOCK_FETCH_ADD:
 584         case TCODE_LOCK_LITTLE_ADD:
 585         case TCODE_LOCK_BOUNDED_ADD:
 586         case TCODE_LOCK_WRAP_ADD:
 587         case TCODE_LOCK_VENDOR_DEPENDENT:
 588                 break;
 589         default:
 590                 return -EINVAL;
 591         }
 592
 593         return init_request(client, request, client->device->node_id,
 594                             client->device->max_speed);
 595 }
 596
 597 static void release_request(struct client *client,
 598                             struct client_resource *resource)
 599 {
 600         struct inbound_transaction_resource *r = container_of(resource,
 601                         struct inbound_transaction_resource, resource);
 602
 603         fw_send_response(client->device->card, r->request,
 604                          RCODE_CONFLICT_ERROR);
 605         kfree(r);
 606 }
 607
 608 static void handle_request(struct fw_card *card, struct fw_request *request,
 609                            int tcode, int destination, int source,
 610                            int generation, int speed,
 611                            unsigned long long offset,
 612                            void *payload, size_t length, void *callback_data)
 613 {
 614         struct address_handler_resource *handler = callback_data;
 615         struct inbound_transaction_resource *r;
 616         struct inbound_transaction_event *e;
 617         int ret;
 618
 619         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 620         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 621         if (r == NULL || e == NULL)
 622                 goto failed;
 623
 624         r->request = request;
 625         r->data    = payload;
 626         r->length  = length;
 627
 628         r->resource.release = release_request;
 629         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 630         if (ret < 0)
 631                 goto failed;
 632
 633         e->request.type    = FW_CDEV_EVENT_REQUEST;
 634         e->request.tcode   = tcode;
 635         e->request.offset  = offset;
 636         e->request.length  = length;
 637         e->request.handle  = r->resource.handle;
 638         e->request.closure = handler->closure;
 639
 640         queue_event(handler->client, &e->event,
 641                     &e->request, sizeof(e->request), payload, length);
 642         return;
 643
 644  failed:
 645         kfree(r);
 646         kfree(e);
 647         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 648 }
 649
 650 static void release_address_handler(struct client *client,
 651                                     struct client_resource *resource)
 652 {
 653         struct address_handler_resource *r =
 654             container_of(resource, struct address_handler_resource, resource);
 655
 656         fw_core_remove_address_handler(&r->handler);
 657         kfree(r);
 658 }
 659
 660 static int ioctl_allocate(struct client *client, void *buffer)
 661 {
 662         struct fw_cdev_allocate *request = buffer;
 663         struct address_handler_resource *r;
 664         struct fw_address_region region;
 665         int ret;
 666
 667         r = kmalloc(sizeof(*r), GFP_KERNEL);
 668         if (r == NULL)
 669                 return -ENOMEM;
 670
 671         region.start = request->offset;
 672         region.end = request->offset + request->length;
 673         r->handler.length = request->length;
 674         r->handler.address_callback = handle_request;
 675         r->handler.callback_data = r;
 676         r->closure = request->closure;
 677         r->client = client;
 678
 679         ret = fw_core_add_address_handler(&r->handler, &region);
 680         if (ret < 0) {
 681                 kfree(r);
 682                 return ret;
 683         }
 684
 685         r->resource.release = release_address_handler;
 686         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 687         if (ret < 0) {
 688                 release_address_handler(client, &r->resource);
 689                 return ret;
 690         }
 691         request->handle = r->resource.handle;
 692
 693         return 0;
 694 }
 695
 696 static int ioctl_deallocate(struct client *client, void *buffer)
 697 {
 698         struct fw_cdev_deallocate *request = buffer;
 699
 700         return release_client_resource(client, request->handle,
 701                                        release_address_handler, NULL);
 702 }
 703
 704 static int ioctl_send_response(struct client *client, void *buffer)
 705 {
 706         struct fw_cdev_send_response *request = buffer;
 707         struct client_resource *resource;
 708         struct inbound_transaction_resource *r;
 709         int ret = 0;
 710
 711         if (release_client_resource(client, request->handle,
 712                                     release_request, &resource) < 0)
 713                 return -EINVAL;
 714
 715         r = container_of(resource, struct inbound_transaction_resource,
 716                          resource);
 717         if (request->length < r->length)
 718                 r->length = request->length;
 719
 720         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length)) {
 721                 ret = -EFAULT;
 722                 goto out;
 723         }
 724
 725         fw_send_response(client->device->card, r->request, request->rcode);
 726  out:
 727         kfree(r);
 728
 729         return ret;
 730 }
 731
 732 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 733 {
 734         struct fw_cdev_initiate_bus_reset *request = buffer;
 735         int short_reset;
 736
 737         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 738
 739         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 740 }
 741
 742 static void release_descriptor(struct client *client,
 743                                struct client_resource *resource)
 744 {
 745         struct descriptor_resource *r =
 746                 container_of(resource, struct descriptor_resource, resource);
 747
 748         fw_core_remove_descriptor(&r->descriptor);
 749         kfree(r);
 750 }
 751
 752 static int ioctl_add_descriptor(struct client *client, void *buffer)
 753 {
 754         struct fw_cdev_add_descriptor *request = buffer;
 755         struct descriptor_resource *r;
 756         int ret;
 757
 758         /* Access policy: Allow this ioctl only on local nodes' device files. */
 759         if (!client->device->is_local)
 760                 return -ENOSYS;
 761
 762         if (request->length > 256)
 763                 return -EINVAL;
 764
 765         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 766         if (r == NULL)
 767                 return -ENOMEM;
 768
 769         if (copy_from_user(r->data,
 770                            u64_to_uptr(request->data), request->length * 4)) {
 771                 ret = -EFAULT;
 772                 goto failed;
 773         }
 774
 775         r->descriptor.length    = request->length;
 776         r->descriptor.immediate = request->immediate;
 777         r->descriptor.key       = request->key;
 778         r->descriptor.data      = r->data;
 779
 780         ret = fw_core_add_descriptor(&r->descriptor);
 781         if (ret < 0)
 782                 goto failed;
 783
 784         r->resource.release = release_descriptor;
 785         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 786         if (ret < 0) {
 787                 fw_core_remove_descriptor(&r->descriptor);
 788                 goto failed;
 789         }
 790         request->handle = r->resource.handle;
 791
 792         return 0;
 793  failed:
 794         kfree(r);
 795
 796         return ret;
 797 }
 798
 799 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 800 {
 801         struct fw_cdev_remove_descriptor *request = buffer;
 802
 803         return release_client_resource(client, request->handle,
 804                                        release_descriptor, NULL);
 805 }
 806
 807 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 808                          size_t header_length, void *header, void *data)
 809 {
 810         struct client *client = data;
 811         struct iso_interrupt_event *e;
 812
 813         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 814         if (e == NULL)
 815                 return;
 816
 817         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 818         e->interrupt.closure   = client->iso_closure;
 819         e->interrupt.cycle     = cycle;
 820         e->interrupt.header_length = header_length;
 821         memcpy(e->interrupt.header, header, header_length);
 822         queue_event(client, &e->event, &e->interrupt,
 823                     sizeof(e->interrupt) + header_length, NULL, 0);
 824 }
 825
 826 static int ioctl_create_iso_context(struct client *client, void *buffer)
 827 {
 828         struct fw_cdev_create_iso_context *request = buffer;
 829         struct fw_iso_context *context;
 830
 831         /* We only support one context at this time. */
 832         if (client->iso_context != NULL)
 833                 return -EBUSY;
 834
 835         if (request->channel > 63)
 836                 return -EINVAL;
 837
 838         switch (request->type) {
 839         case FW_ISO_CONTEXT_RECEIVE:
 840                 if (request->header_size < 4 || (request->header_size & 3))
 841                         return -EINVAL;
 842
 843                 break;
 844
 845         case FW_ISO_CONTEXT_TRANSMIT:
 846                 if (request->speed > SCODE_3200)
 847                         return -EINVAL;
 848
 849                 break;
 850
 851         default:
 852                 return -EINVAL;
 853         }
 854
 855         context =  fw_iso_context_create(client->device->card,
 856                                          request->type,
 857                                          request->channel,
 858                                          request->speed,
 859                                          request->header_size,
 860                                          iso_callback, client);
 861         if (IS_ERR(context))
 862                 return PTR_ERR(context);
 863
 864         client->iso_closure = request->closure;
 865         client->iso_context = context;
 866
 867         /* We only support one context at this time. */
 868         request->handle = 0;
 869
 870         return 0;
 871 }
 872
 873 /* Macros for decoding the iso packet control header. */
 874 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 875 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 876 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 877 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 878 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 879 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 880
 881 static int ioctl_queue_iso(struct client *client, void *buffer)
 882 {
 883         struct fw_cdev_queue_iso *request = buffer;
 884         struct fw_cdev_iso_packet __user *p, *end, *next;
 885         struct fw_iso_context *ctx = client->iso_context;
 886         unsigned long payload, buffer_end, header_length;
 887         u32 control;
 888         int count;
 889         struct {
 890                 struct fw_iso_packet packet;
 891                 u8 header[256];
 892         } u;
 893
 894         if (ctx == NULL || request->handle != 0)
 895                 return -EINVAL;
 896
 897         /*
 898          * If the user passes a non-NULL data pointer, has mmap()'ed
 899          * the iso buffer, and the pointer points inside the buffer,
 900          * we setup the payload pointers accordingly.  Otherwise we
 901          * set them both to 0, which will still let packets with
 902          * payload_length == 0 through.  In other words, if no packets
 903          * use the indirect payload, the iso buffer need not be mapped
 904          * and the request->data pointer is ignored.
 905          */
 906
 907         payload = (unsigned long)request->data - client->vm_start;
 908         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 909         if (request->data == 0 || client->buffer.pages == NULL ||
 910             payload >= buffer_end) {
 911                 payload = 0;
 912                 buffer_end = 0;
 913         }
 914
 915         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 916
 917         if (!access_ok(VERIFY_READ, p, request->size))
 918                 return -EFAULT;
 919
 920         end = (void __user *)p + request->size;
 921         count = 0;
 922         while (p < end) {
 923                 if (get_user(control, &p->control))
 924                         return -EFAULT;
 925                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 926                 u.packet.interrupt = GET_INTERRUPT(control);
 927                 u.packet.skip = GET_SKIP(control);
 928                 u.packet.tag = GET_TAG(control);
 929                 u.packet.sy = GET_SY(control);
 930                 u.packet.header_length = GET_HEADER_LENGTH(control);
 931
 932                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 933                         header_length = u.packet.header_length;
 934                 } else {
 935                         /*
 936                          * We require that header_length is a multiple of
 937                          * the fixed header size, ctx->header_size.
 938                          */
 939                         if (ctx->header_size == 0) {
 940                                 if (u.packet.header_length > 0)
 941                                         return -EINVAL;
 942                         } else if (u.packet.header_length % ctx->header_size != 0) {
 943                                 return -EINVAL;
 944                         }
 945                         header_length = 0;
 946                 }
 947
 948                 next = (struct fw_cdev_iso_packet __user *)
 949                         &p->header[header_length / 4];
 950                 if (next > end)
 951                         return -EINVAL;
 952                 if (__copy_from_user
 953                     (u.packet.header, p->header, header_length))
 954                         return -EFAULT;
 955                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 956                     u.packet.header_length + u.packet.payload_length > 0)
 957                         return -EINVAL;
 958                 if (payload + u.packet.payload_length > buffer_end)
 959                         return -EINVAL;
 960
 961                 if (fw_iso_context_queue(ctx, &u.packet,
 962                                          &client->buffer, payload))
 963                         break;
 964
 965                 p = next;
 966                 payload += u.packet.payload_length;
 967                 count++;
 968         }
 969
 970         request->size    -= uptr_to_u64(p) - request->packets;
 971         request->packets  = uptr_to_u64(p);
 972         request->data     = client->vm_start + payload;
 973
 974         return count;
 975 }
 976
 977 static int ioctl_start_iso(struct client *client, void *buffer)
 978 {
 979         struct fw_cdev_start_iso *request = buffer;
 980
 981         if (client->iso_context == NULL || request->handle != 0)
 982                 return -EINVAL;
 983
 984         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 985                 if (request->tags == 0 || request->tags > 15)
 986                         return -EINVAL;
 987
 988                 if (request->sync > 15)
 989                         return -EINVAL;
 990         }
 991
 992         return fw_iso_context_start(client->iso_context, request->cycle,
 993                                     request->sync, request->tags);
 994 }
 995
 996 static int ioctl_stop_iso(struct client *client, void *buffer)
 997 {
 998         struct fw_cdev_stop_iso *request = buffer;
 999
1000         if (client->iso_context == NULL || request->handle != 0)
1001                 return -EINVAL;
1002
1003         return fw_iso_context_stop(client->iso_context);
1004 }
1005
1006 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
1007 {
1008         struct fw_cdev_get_cycle_timer *request = buffer;
1009         struct fw_card *card = client->device->card;
1010         unsigned long long bus_time;
1011         struct timeval tv;
1012         unsigned long flags;
1013
1014         preempt_disable();
1015         local_irq_save(flags);
1016
1017         bus_time = card->driver->get_bus_time(card);
1018         do_gettimeofday(&tv);
1019
1020         local_irq_restore(flags);
1021         preempt_enable();
1022
1023         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1024         request->cycle_timer = bus_time & 0xffffffff;
1025         return 0;
1026 }
1027
1028 static void iso_resource_work(struct work_struct *work)
1029 {
1030         struct iso_resource_event *e;
1031         struct iso_resource *r =
1032                         container_of(work, struct iso_resource, work.work);
1033         struct client *client = r->client;
1034         int generation, channel, bandwidth, todo;
1035         bool skip, free, success;
1036
1037         spin_lock_irq(&client->lock);
1038         generation = client->device->generation;
1039         todo = r->todo;
1040         /* Allow 1000ms grace period for other reallocations. */
1041         if (todo == ISO_RES_ALLOC &&
1042             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1043                 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1044                 skip = true;
1045         } else {
1046                 /* We could be called twice within the same generation. */
1047                 skip = todo == ISO_RES_REALLOC &&
1048                        r->generation == generation;
1049         }
1050         free = todo == ISO_RES_DEALLOC ||
1051                todo == ISO_RES_ALLOC_ONCE ||
1052                todo == ISO_RES_DEALLOC_ONCE;
1053         r->generation = generation;
1054         spin_unlock_irq(&client->lock);
1055
1056         if (skip)
1057                 goto out;
1058
1059         bandwidth = r->bandwidth;
1060
1061         fw_iso_resource_manage(client->device->card, generation,
1062                         r->channels, &channel, &bandwidth,
1063                         todo == ISO_RES_ALLOC ||
1064                         todo == ISO_RES_REALLOC ||
1065                         todo == ISO_RES_ALLOC_ONCE,
1066                         r->transaction_data);
1067         /*
1068          * Is this generation outdated already?  As long as this resource sticks
1069          * in the idr, it will be scheduled again for a newer generation or at
1070          * shutdown.
1071          */
1072         if (channel == -EAGAIN &&
1073             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1074                 goto out;
1075
1076         success = channel >= 0 || bandwidth > 0;
1077
1078         spin_lock_irq(&client->lock);
1079         /*
1080          * Transit from allocation to reallocation, except if the client
1081          * requested deallocation in the meantime.
1082          */
1083         if (r->todo == ISO_RES_ALLOC)
1084                 r->todo = ISO_RES_REALLOC;
1085         /*
1086          * Allocation or reallocation failure?  Pull this resource out of the
1087          * idr and prepare for deletion, unless the client is shutting down.
1088          */
1089         if (r->todo == ISO_RES_REALLOC && !success &&
1090             !client->in_shutdown &&
1091             idr_find(&client->resource_idr, r->resource.handle)) {
1092                 idr_remove(&client->resource_idr, r->resource.handle);
1093                 client_put(client);
1094                 free = true;
1095         }
1096         spin_unlock_irq(&client->lock);
1097
1098         if (todo == ISO_RES_ALLOC && channel >= 0)
1099                 r->channels = 1ULL << channel;
1100
1101         if (todo == ISO_RES_REALLOC && success)
1102                 goto out;
1103
1104         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1105                 e = r->e_alloc;
1106                 r->e_alloc = NULL;
1107         } else {
1108                 e = r->e_dealloc;
1109                 r->e_dealloc = NULL;
1110         }
1111         e->resource.handle      = r->resource.handle;
1112         e->resource.channel     = channel;
1113         e->resource.bandwidth   = bandwidth;
1114
1115         queue_event(client, &e->event,
1116                     &e->resource, sizeof(e->resource), NULL, 0);
1117
1118         if (free) {
1119                 cancel_delayed_work(&r->work);
1120                 kfree(r->e_alloc);
1121                 kfree(r->e_dealloc);
1122                 kfree(r);
1123         }
1124  out:
1125         client_put(client);
1126 }
1127
1128 static void release_iso_resource(struct client *client,
1129                                  struct client_resource *resource)
1130 {
1131         struct iso_resource *r =
1132                 container_of(resource, struct iso_resource, resource);
1133
1134         spin_lock_irq(&client->lock);
1135         r->todo = ISO_RES_DEALLOC;
1136         schedule_iso_resource(r, 0);
1137         spin_unlock_irq(&client->lock);
1138 }
1139
1140 static int init_iso_resource(struct client *client,
1141                 struct fw_cdev_allocate_iso_resource *request, int todo)
1142 {
1143         struct iso_resource_event *e1, *e2;
1144         struct iso_resource *r;
1145         int ret;
1146
1147         if ((request->channels == 0 && request->bandwidth == 0) ||
1148             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1149             request->bandwidth < 0)
1150                 return -EINVAL;
1151
1152         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1153         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1154         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1155         if (r == NULL || e1 == NULL || e2 == NULL) {
1156                 ret = -ENOMEM;
1157                 goto fail;
1158         }
1159
1160         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1161         r->client       = client;
1162         r->todo         = todo;
1163         r->generation   = -1;
1164         r->channels     = request->channels;
1165         r->bandwidth    = request->bandwidth;
1166         r->e_alloc      = e1;
1167         r->e_dealloc    = e2;
1168
1169         e1->resource.closure    = request->closure;
1170         e1->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1171         e2->resource.closure    = request->closure;
1172         e2->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1173
1174         if (todo == ISO_RES_ALLOC) {
1175                 r->resource.release = release_iso_resource;
1176                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1177                 if (ret < 0)
1178                         goto fail;
1179         } else {
1180                 r->resource.release = NULL;
1181                 r->resource.handle = -1;
1182                 schedule_iso_resource(r, 0);
1183         }
1184         request->handle = r->resource.handle;
1185
1186         return 0;
1187  fail:
1188         kfree(r);
1189         kfree(e1);
1190         kfree(e2);
1191
1192         return ret;
1193 }
1194
1195 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1196 {
1197         struct fw_cdev_allocate_iso_resource *request = buffer;
1198
1199         return init_iso_resource(client, request, ISO_RES_ALLOC);
1200 }
1201
1202 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1203 {
1204         struct fw_cdev_deallocate *request = buffer;
1205
1206         return release_client_resource(client, request->handle,
1207                                        release_iso_resource, NULL);
1208 }
1209
1210 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1211 {
1212         struct fw_cdev_allocate_iso_resource *request = buffer;
1213
1214         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1215 }
1216
1217 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1218 {
1219         struct fw_cdev_allocate_iso_resource *request = buffer;
1220
1221         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1222 }
1223
1224 /*
1225  * Returns a speed code:  Maximum speed to or from this device,
1226  * limited by the device's link speed, the local node's link speed,
1227  * and all PHY port speeds between the two links.
1228  */
1229 static int ioctl_get_speed(struct client *client, void *buffer)
1230 {
1231         return client->device->max_speed;
1232 }
1233
1234 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1235 {
1236         struct fw_cdev_send_request *request = buffer;
1237
1238         switch (request->tcode) {
1239         case TCODE_WRITE_QUADLET_REQUEST:
1240         case TCODE_WRITE_BLOCK_REQUEST:
1241                 break;
1242         default:
1243                 return -EINVAL;
1244         }
1245
1246         /* Security policy: Only allow accesses to Units Space. */
1247         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1248                 return -EACCES;
1249
1250         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1251 }
1252
1253 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1254 {
1255         struct fw_cdev_send_stream_packet *p = buffer;
1256         struct fw_cdev_send_request request;
1257         int dest;
1258
1259         if (p->speed > client->device->card->link_speed ||
1260             p->length > 1024 << p->speed)
1261                 return -EIO;
1262
1263         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1264                 return -EINVAL;
1265
1266         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1267         request.tcode           = TCODE_STREAM_DATA;
1268         request.length          = p->length;
1269         request.closure         = p->closure;
1270         request.data            = p->data;
1271         request.generation      = p->generation;
1272
1273         return init_request(client, &request, dest, p->speed);
1274 }
1275
1276 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1277         ioctl_get_info,
1278         ioctl_send_request,
1279         ioctl_allocate,
1280         ioctl_deallocate,
1281         ioctl_send_response,
1282         ioctl_initiate_bus_reset,
1283         ioctl_add_descriptor,
1284         ioctl_remove_descriptor,
1285         ioctl_create_iso_context,
1286         ioctl_queue_iso,
1287         ioctl_start_iso,
1288         ioctl_stop_iso,
1289         ioctl_get_cycle_timer,
1290         ioctl_allocate_iso_resource,
1291         ioctl_deallocate_iso_resource,
1292         ioctl_allocate_iso_resource_once,
1293         ioctl_deallocate_iso_resource_once,
1294         ioctl_get_speed,
1295         ioctl_send_broadcast_request,
1296         ioctl_send_stream_packet,
1297 };
1298
1299 static int dispatch_ioctl(struct client *client,
1300                           unsigned int cmd, void __user *arg)
1301 {
1302         char buffer[256];
1303         int ret;
1304
1305         if (_IOC_TYPE(cmd) != '#' ||
1306             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1307                 return -EINVAL;
1308
1309         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1310                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1311                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1312                         return -EFAULT;
1313         }
1314
1315         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1316         if (ret < 0)
1317                 return ret;
1318
1319         if (_IOC_DIR(cmd) & _IOC_READ) {
1320                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1321                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1322                         return -EFAULT;
1323         }
1324
1325         return ret;
1326 }
1327
1328 static long fw_device_op_ioctl(struct file *file,
1329                                unsigned int cmd, unsigned long arg)
1330 {
1331         struct client *client = file->private_data;
1332
1333         if (fw_device_is_shutdown(client->device))
1334                 return -ENODEV;
1335
1336         return dispatch_ioctl(client, cmd, (void __user *) arg);
1337 }
1338
1339 #ifdef CONFIG_COMPAT
1340 static long fw_device_op_compat_ioctl(struct file *file,
1341                                       unsigned int cmd, unsigned long arg)
1342 {
1343         struct client *client = file->private_data;
1344
1345         if (fw_device_is_shutdown(client->device))
1346                 return -ENODEV;
1347
1348         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1349 }
1350 #endif
1351
1352 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1353 {
1354         struct client *client = file->private_data;
1355         enum dma_data_direction direction;
1356         unsigned long size;
1357         int page_count, ret;
1358
1359         if (fw_device_is_shutdown(client->device))
1360                 return -ENODEV;
1361
1362         /* FIXME: We could support multiple buffers, but we don't. */
1363         if (client->buffer.pages != NULL)
1364                 return -EBUSY;
1365
1366         if (!(vma->vm_flags & VM_SHARED))
1367                 return -EINVAL;
1368
1369         if (vma->vm_start & ~PAGE_MASK)
1370                 return -EINVAL;
1371
1372         client->vm_start = vma->vm_start;
1373         size = vma->vm_end - vma->vm_start;
1374         page_count = size >> PAGE_SHIFT;
1375         if (size & ~PAGE_MASK)
1376                 return -EINVAL;
1377
1378         if (vma->vm_flags & VM_WRITE)
1379                 direction = DMA_TO_DEVICE;
1380         else
1381                 direction = DMA_FROM_DEVICE;
1382
1383         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1384                                  page_count, direction);
1385         if (ret < 0)
1386                 return ret;
1387
1388         ret = fw_iso_buffer_map(&client->buffer, vma);
1389         if (ret < 0)
1390                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1391
1392         return ret;
1393 }
1394
1395 static int shutdown_resource(int id, void *p, void *data)
1396 {
1397         struct client_resource *r = p;
1398         struct client *client = data;
1399
1400         r->release(client, r);
1401         client_put(client);
1402
1403         return 0;
1404 }
1405
1406 static int fw_device_op_release(struct inode *inode, struct file *file)
1407 {
1408         struct client *client = file->private_data;
1409         struct event *e, *next_e;
1410
1411         mutex_lock(&client->device->client_list_mutex);
1412         list_del(&client->link);
1413         mutex_unlock(&client->device->client_list_mutex);
1414
1415         if (client->iso_context)
1416                 fw_iso_context_destroy(client->iso_context);
1417
1418         if (client->buffer.pages)
1419                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1420
1421         /* Freeze client->resource_idr and client->event_list */
1422         spin_lock_irq(&client->lock);
1423         client->in_shutdown = true;
1424         spin_unlock_irq(&client->lock);
1425
1426         idr_for_each(&client->resource_idr, shutdown_resource, client);
1427         idr_remove_all(&client->resource_idr);
1428         idr_destroy(&client->resource_idr);
1429
1430         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1431                 kfree(e);
1432
1433         client_put(client);
1434
1435         return 0;
1436 }
1437
1438 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1439 {
1440         struct client *client = file->private_data;
1441         unsigned int mask = 0;
1442
1443         poll_wait(file, &client->wait, pt);
1444
1445         if (fw_device_is_shutdown(client->device))
1446                 mask |= POLLHUP | POLLERR;
1447         if (!list_empty(&client->event_list))
1448                 mask |= POLLIN | POLLRDNORM;
1449
1450         return mask;
1451 }
1452
1453 const struct file_operations fw_device_ops = {
1454         .owner          = THIS_MODULE,
1455         .open           = fw_device_op_open,
1456         .read           = fw_device_op_read,
1457         .unlocked_ioctl = fw_device_op_ioctl,
1458         .poll           = fw_device_op_poll,
1459         .release        = fw_device_op_release,
1460         .mmap           = fw_device_op_mmap,
1461
1462 #ifdef CONFIG_COMPAT
1463         .compat_ioctl   = fw_device_op_compat_ioctl,
1464 #endif
1465 };