git.oblomov.eu Git - linux-2.6/blob - drivers/firewire/fw-device-cdev.c

   1 /*                                              -*- c-basic-offset: 8 -*-
   2  *
   3  * fw-device-cdev.c - Char device for device raw access
   4  *
   5  * Copyright (C) 2005-2006  Kristian Hoegsberg <krh@bitplanet.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software Foundation,
  19  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/wait.h>
  25 #include <linux/errno.h>
  26 #include <linux/device.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/poll.h>
  29 #include <linux/delay.h>
  30 #include <linux/mm.h>
  31 #include <linux/idr.h>
  32 #include <linux/compat.h>
  33 #include <asm/uaccess.h>
  34 #include "fw-transaction.h"
  35 #include "fw-topology.h"
  36 #include "fw-device.h"
  37 #include "fw-device-cdev.h"
  38
  39 /*
  40  * todo
  41  *
  42  * - bus resets sends a new packet with new generation and node id
  43  *
  44  */
  45
  46 /* dequeue_event() just kfree()'s the event, so the event has to be
  47  * the first field in the struct. */
  48
  49 struct event {
  50         struct { void *data; size_t size; } v[2];
  51         struct list_head link;
  52 };
  53
  54 struct bus_reset {
  55         struct event event;
  56         struct fw_cdev_event_bus_reset reset;
  57 };
  58
  59 struct response {
  60         struct event event;
  61         struct fw_transaction transaction;
  62         struct client *client;
  63         struct list_head link;
  64         struct fw_cdev_event_response response;
  65 };
  66
  67 struct iso_interrupt {
  68         struct event event;
  69         struct fw_cdev_event_iso_interrupt interrupt;
  70 };
  71
  72 struct client {
  73         u32 version;
  74         struct fw_device *device;
  75         spinlock_t lock;
  76         struct list_head handler_list;
  77         struct list_head request_list;
  78         struct list_head transaction_list;
  79         u32 request_serial;
  80         struct list_head event_list;
  81         wait_queue_head_t wait;
  82
  83         struct fw_iso_context *iso_context;
  84         struct fw_iso_buffer buffer;
  85         unsigned long vm_start;
  86
  87         struct list_head link;
  88 };
  89
  90 static inline void __user *
  91 u64_to_uptr(__u64 value)
  92 {
  93         return (void __user *)(unsigned long)value;
  94 }
  95
  96 static inline __u64
  97 uptr_to_u64(void __user *ptr)
  98 {
  99         return (__u64)(unsigned long)ptr;
 100 }
 101
 102 static int fw_device_op_open(struct inode *inode, struct file *file)
 103 {
 104         struct fw_device *device;
 105         struct client *client;
 106         unsigned long flags;
 107
 108         device = fw_device_from_devt(inode->i_rdev);
 109         if (device == NULL)
 110                 return -ENODEV;
 111
 112         client = kzalloc(sizeof *client, GFP_KERNEL);
 113         if (client == NULL)
 114                 return -ENOMEM;
 115
 116         client->device = fw_device_get(device);
 117         INIT_LIST_HEAD(&client->event_list);
 118         INIT_LIST_HEAD(&client->handler_list);
 119         INIT_LIST_HEAD(&client->request_list);
 120         INIT_LIST_HEAD(&client->transaction_list);
 121         spin_lock_init(&client->lock);
 122         init_waitqueue_head(&client->wait);
 123
 124         file->private_data = client;
 125
 126         spin_lock_irqsave(&device->card->lock, flags);
 127         list_add_tail(&client->link, &device->client_list);
 128         spin_unlock_irqrestore(&device->card->lock, flags);
 129
 130         return 0;
 131 }
 132
 133 static void queue_event(struct client *client, struct event *event,
 134                         void *data0, size_t size0, void *data1, size_t size1)
 135 {
 136         unsigned long flags;
 137
 138         event->v[0].data = data0;
 139         event->v[0].size = size0;
 140         event->v[1].data = data1;
 141         event->v[1].size = size1;
 142
 143         spin_lock_irqsave(&client->lock, flags);
 144
 145         list_add_tail(&event->link, &client->event_list);
 146         wake_up_interruptible(&client->wait);
 147
 148         spin_unlock_irqrestore(&client->lock, flags);
 149 }
 150
 151 static int
 152 dequeue_event(struct client *client, char __user *buffer, size_t count)
 153 {
 154         unsigned long flags;
 155         struct event *event;
 156         size_t size, total;
 157         int i, retval;
 158
 159         retval = wait_event_interruptible(client->wait,
 160                                           !list_empty(&client->event_list) ||
 161                                           fw_device_is_shutdown(client->device));
 162         if (retval < 0)
 163                 return retval;
 164
 165         if (list_empty(&client->event_list) &&
 166                        fw_device_is_shutdown(client->device))
 167                 return -ENODEV;
 168
 169         spin_lock_irqsave(&client->lock, flags);
 170         event = container_of(client->event_list.next, struct event, link);
 171         list_del(&event->link);
 172         spin_unlock_irqrestore(&client->lock, flags);
 173
 174         total = 0;
 175         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 176                 size = min(event->v[i].size, count - total);
 177                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 178                         retval = -EFAULT;
 179                         goto out;
 180                 }
 181                 total += size;
 182         }
 183         retval = total;
 184
 185  out:
 186         kfree(event);
 187
 188         return retval;
 189 }
 190
 191 static ssize_t
 192 fw_device_op_read(struct file *file,
 193                   char __user *buffer, size_t count, loff_t *offset)
 194 {
 195         struct client *client = file->private_data;
 196
 197         return dequeue_event(client, buffer, count);
 198 }
 199
 200 static void
 201 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 202                      struct fw_device *device)
 203 {
 204         struct fw_card *card = device->card;
 205
 206         event->type          = FW_CDEV_EVENT_BUS_RESET;
 207         event->node_id       = device->node_id;
 208         event->local_node_id = card->local_node->node_id;
 209         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 210         event->irm_node_id   = card->irm_node->node_id;
 211         event->root_node_id  = card->root_node->node_id;
 212         event->generation    = card->generation;
 213 }
 214
 215 static void
 216 for_each_client(struct fw_device *device,
 217                 void (*callback)(struct client *client))
 218 {
 219         struct fw_card *card = device->card;
 220         struct client *c;
 221         unsigned long flags;
 222
 223         spin_lock_irqsave(&card->lock, flags);
 224
 225         list_for_each_entry(c, &device->client_list, link)
 226                 callback(c);
 227
 228         spin_unlock_irqrestore(&card->lock, flags);
 229 }
 230
 231 static void
 232 queue_bus_reset_event(struct client *client)
 233 {
 234         struct bus_reset *bus_reset;
 235         struct fw_device *device = client->device;
 236
 237         bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC);
 238         if (bus_reset == NULL) {
 239                 fw_notify("Out of memory when allocating bus reset event\n");
 240                 return;
 241         }
 242
 243         fill_bus_reset_event(&bus_reset->reset, device);
 244
 245         queue_event(client, &bus_reset->event,
 246                     &bus_reset->reset, sizeof bus_reset->reset, NULL, 0);
 247 }
 248
 249 void fw_device_cdev_update(struct fw_device *device)
 250 {
 251         for_each_client(device, queue_bus_reset_event);
 252 }
 253
 254 static void wake_up_client(struct client *client)
 255 {
 256         wake_up_interruptible(&client->wait);
 257 }
 258
 259 void fw_device_cdev_remove(struct fw_device *device)
 260 {
 261         for_each_client(device, wake_up_client);
 262 }
 263
 264 static int ioctl_get_info(struct client *client, void __user *arg)
 265 {
 266         struct fw_cdev_get_info get_info;
 267         struct fw_cdev_event_bus_reset bus_reset;
 268
 269         if (copy_from_user(&get_info, arg, sizeof get_info))
 270                 return -EFAULT;
 271
 272         client->version = get_info.version;
 273         get_info.version = FW_CDEV_VERSION;
 274
 275         if (get_info.rom != 0) {
 276                 void __user *uptr = u64_to_uptr(get_info.rom);
 277                 size_t length = min(get_info.rom_length,
 278                                     client->device->config_rom_length * 4);
 279
 280                 if (copy_to_user(uptr, client->device->config_rom, length))
 281                         return -EFAULT;
 282         }
 283         get_info.rom_length = client->device->config_rom_length * 4;
 284
 285         if (get_info.bus_reset != 0) {
 286                 void __user *uptr = u64_to_uptr(get_info.bus_reset);
 287
 288                 fill_bus_reset_event(&bus_reset, client->device);
 289                 if (copy_to_user(uptr, &bus_reset, sizeof bus_reset))
 290                         return -EFAULT;
 291         }
 292
 293         if (copy_to_user(arg, &get_info, sizeof get_info))
 294                 return -EFAULT;
 295
 296         return 0;
 297 }
 298
 299 static void
 300 complete_transaction(struct fw_card *card, int rcode,
 301                      void *payload, size_t length, void *data)
 302 {
 303         struct response *response = data;
 304         struct client *client = response->client;
 305         unsigned long flags;
 306
 307         if (length < response->response.length)
 308                 response->response.length = length;
 309         if (rcode == RCODE_COMPLETE)
 310                 memcpy(response->response.data, payload,
 311                        response->response.length);
 312
 313         spin_lock_irqsave(&client->lock, flags);
 314         list_del(&response->link);
 315         spin_unlock_irqrestore(&client->lock, flags);
 316
 317         response->response.type   = FW_CDEV_EVENT_RESPONSE;
 318         response->response.rcode  = rcode;
 319         queue_event(client, &response->event,
 320                     &response->response, sizeof response->response,
 321                     response->response.data, response->response.length);
 322 }
 323
 324 static ssize_t ioctl_send_request(struct client *client, void __user *arg)
 325 {
 326         struct fw_device *device = client->device;
 327         struct fw_cdev_send_request request;
 328         struct response *response;
 329         unsigned long flags;
 330
 331         if (copy_from_user(&request, arg, sizeof request))
 332                 return -EFAULT;
 333
 334         /* What is the biggest size we'll accept, really? */
 335         if (request.length > 4096)
 336                 return -EINVAL;
 337
 338         response = kmalloc(sizeof *response + request.length, GFP_KERNEL);
 339         if (response == NULL)
 340                 return -ENOMEM;
 341
 342         response->client = client;
 343         response->response.length = request.length;
 344         response->response.closure = request.closure;
 345
 346         if (request.data &&
 347             copy_from_user(response->response.data,
 348                            u64_to_uptr(request.data), request.length)) {
 349                 kfree(response);
 350                 return -EFAULT;
 351         }
 352
 353         spin_lock_irqsave(&client->lock, flags);
 354         list_add_tail(&response->link, &client->transaction_list);
 355         spin_unlock_irqrestore(&client->lock, flags);
 356
 357         fw_send_request(device->card, &response->transaction,
 358                         request.tcode & 0x1f,
 359                         device->node->node_id,
 360                         device->card->generation,
 361                         device->node->max_speed,
 362                         request.offset,
 363                         response->response.data, request.length,
 364                         complete_transaction, response);
 365
 366         if (request.data)
 367                 return sizeof request + request.length;
 368         else
 369                 return sizeof request;
 370 }
 371
 372 struct address_handler {
 373         struct fw_address_handler handler;
 374         __u64 closure;
 375         struct client *client;
 376         struct list_head link;
 377 };
 378
 379 struct request {
 380         struct fw_request *request;
 381         void *data;
 382         size_t length;
 383         u32 serial;
 384         struct list_head link;
 385 };
 386
 387 struct request_event {
 388         struct event event;
 389         struct fw_cdev_event_request request;
 390 };
 391
 392 static void
 393 handle_request(struct fw_card *card, struct fw_request *r,
 394                int tcode, int destination, int source,
 395                int generation, int speed,
 396                unsigned long long offset,
 397                void *payload, size_t length, void *callback_data)
 398 {
 399         struct address_handler *handler = callback_data;
 400         struct request *request;
 401         struct request_event *e;
 402         unsigned long flags;
 403         struct client *client = handler->client;
 404
 405         request = kmalloc(sizeof *request, GFP_ATOMIC);
 406         e = kmalloc(sizeof *e, GFP_ATOMIC);
 407         if (request == NULL || e == NULL) {
 408                 kfree(request);
 409                 kfree(e);
 410                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
 411                 return;
 412         }
 413
 414         request->request = r;
 415         request->data    = payload;
 416         request->length  = length;
 417
 418         spin_lock_irqsave(&client->lock, flags);
 419         request->serial = client->request_serial++;
 420         list_add_tail(&request->link, &client->request_list);
 421         spin_unlock_irqrestore(&client->lock, flags);
 422
 423         e->request.type    = FW_CDEV_EVENT_REQUEST;
 424         e->request.tcode   = tcode;
 425         e->request.offset  = offset;
 426         e->request.length  = length;
 427         e->request.serial  = request->serial;
 428         e->request.closure = handler->closure;
 429
 430         queue_event(client, &e->event,
 431                     &e->request, sizeof e->request, payload, length);
 432 }
 433
 434 static int ioctl_allocate(struct client *client, void __user *arg)
 435 {
 436         struct fw_cdev_allocate request;
 437         struct address_handler *handler;
 438         unsigned long flags;
 439         struct fw_address_region region;
 440
 441         if (copy_from_user(&request, arg, sizeof request))
 442                 return -EFAULT;
 443
 444         handler = kmalloc(sizeof *handler, GFP_KERNEL);
 445         if (handler == NULL)
 446                 return -ENOMEM;
 447
 448         region.start = request.offset;
 449         region.end = request.offset + request.length;
 450         handler->handler.length = request.length;
 451         handler->handler.address_callback = handle_request;
 452         handler->handler.callback_data = handler;
 453         handler->closure = request.closure;
 454         handler->client = client;
 455
 456         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
 457                 kfree(handler);
 458                 return -EBUSY;
 459         }
 460
 461         spin_lock_irqsave(&client->lock, flags);
 462         list_add_tail(&handler->link, &client->handler_list);
 463         spin_unlock_irqrestore(&client->lock, flags);
 464
 465         return 0;
 466 }
 467
 468 static int ioctl_send_response(struct client *client, void __user *arg)
 469 {
 470         struct fw_cdev_send_response request;
 471         struct request *r;
 472         unsigned long flags;
 473
 474         if (copy_from_user(&request, arg, sizeof request))
 475                 return -EFAULT;
 476
 477         spin_lock_irqsave(&client->lock, flags);
 478         list_for_each_entry(r, &client->request_list, link) {
 479                 if (r->serial == request.serial) {
 480                         list_del(&r->link);
 481                         break;
 482                 }
 483         }
 484         spin_unlock_irqrestore(&client->lock, flags);
 485
 486         if (&r->link == &client->request_list)
 487                 return -EINVAL;
 488
 489         if (request.length < r->length)
 490                 r->length = request.length;
 491         if (copy_from_user(r->data, u64_to_uptr(request.data), r->length))
 492                 return -EFAULT;
 493
 494         fw_send_response(client->device->card, r->request, request.rcode);
 495
 496         kfree(r);
 497
 498         return 0;
 499 }
 500
 501 static int ioctl_initiate_bus_reset(struct client *client, void __user *arg)
 502 {
 503         struct fw_cdev_initiate_bus_reset request;
 504         int short_reset;
 505
 506         if (copy_from_user(&request, arg, sizeof request))
 507                 return -EFAULT;
 508
 509         short_reset = (request.type == FW_CDEV_SHORT_RESET);
 510
 511         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 512 }
 513
 514 static void
 515 iso_callback(struct fw_iso_context *context, u32 cycle,
 516              size_t header_length, void *header, void *data)
 517 {
 518         struct client *client = data;
 519         struct iso_interrupt *interrupt;
 520
 521         interrupt = kzalloc(sizeof *interrupt + header_length, GFP_ATOMIC);
 522         if (interrupt == NULL)
 523                 return;
 524
 525         interrupt->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 526         interrupt->interrupt.closure   = 0;
 527         interrupt->interrupt.cycle     = cycle;
 528         interrupt->interrupt.header_length = header_length;
 529         memcpy(interrupt->interrupt.header, header, header_length);
 530         queue_event(client, &interrupt->event,
 531                     &interrupt->interrupt,
 532                     sizeof interrupt->interrupt + header_length, NULL, 0);
 533 }
 534
 535 static int ioctl_create_iso_context(struct client *client, void __user *arg)
 536 {
 537         struct fw_cdev_create_iso_context request;
 538
 539         if (copy_from_user(&request, arg, sizeof request))
 540                 return -EFAULT;
 541
 542         if (request.type > FW_ISO_CONTEXT_RECEIVE)
 543                 return -EINVAL;
 544
 545         if (request.channel > 63)
 546                 return -EINVAL;
 547
 548         if (request.sync > 15)
 549                 return -EINVAL;
 550
 551         if (request.tags == 0 || request.tags > 15)
 552                 return -EINVAL;
 553
 554         if (request.speed > SCODE_3200)
 555                 return -EINVAL;
 556
 557         client->iso_context = fw_iso_context_create(client->device->card,
 558                                                     request.type,
 559                                                     request.channel,
 560                                                     request.speed,
 561                                                     request.header_size,
 562                                                     request.sync,
 563                                                     request.tags,
 564                                                     iso_callback, client);
 565         if (IS_ERR(client->iso_context))
 566                 return PTR_ERR(client->iso_context);
 567
 568         return 0;
 569 }
 570
 571 static int ioctl_queue_iso(struct client *client, void __user *arg)
 572 {
 573         struct fw_cdev_queue_iso request;
 574         struct fw_cdev_iso_packet __user *p, *end, *next;
 575         struct fw_iso_context *ctx = client->iso_context;
 576         unsigned long payload, payload_end, header_length;
 577         int count;
 578         struct {
 579                 struct fw_iso_packet packet;
 580                 u8 header[256];
 581         } u;
 582
 583         if (ctx == NULL)
 584                 return -EINVAL;
 585         if (copy_from_user(&request, arg, sizeof request))
 586                 return -EFAULT;
 587
 588         /* If the user passes a non-NULL data pointer, has mmap()'ed
 589          * the iso buffer, and the pointer points inside the buffer,
 590          * we setup the payload pointers accordingly.  Otherwise we
 591          * set them both to 0, which will still let packets with
 592          * payload_length == 0 through.  In other words, if no packets
 593          * use the indirect payload, the iso buffer need not be mapped
 594          * and the request.data pointer is ignored.*/
 595
 596         payload = (unsigned long)request.data - client->vm_start;
 597         payload_end = payload + (client->buffer.page_count << PAGE_SHIFT);
 598         if (request.data == 0 || client->buffer.pages == NULL ||
 599             payload >= payload_end) {
 600                 payload = 0;
 601                 payload_end = 0;
 602         }
 603
 604         if (!access_ok(VERIFY_READ, request.packets, request.size))
 605                 return -EFAULT;
 606
 607         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request.packets);
 608         end = (void __user *)p + request.size;
 609         count = 0;
 610         while (p < end) {
 611                 if (__copy_from_user(&u.packet, p, sizeof *p))
 612                         return -EFAULT;
 613
 614                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 615                         header_length = u.packet.header_length;
 616                 } else {
 617                         /* We require that header_length is a multiple of
 618                          * the fixed header size, ctx->header_size */
 619                         if (ctx->header_size == 0) {
 620                                 if (u.packet.header_length > 0)
 621                                         return -EINVAL;
 622                         } else if (u.packet.header_length % ctx->header_size != 0) {
 623                                 return -EINVAL;
 624                         }
 625                         header_length = 0;
 626                 }
 627
 628                 next = (struct fw_cdev_iso_packet __user *)
 629                         &p->header[header_length / 4];
 630                 if (next > end)
 631                         return -EINVAL;
 632                 if (__copy_from_user
 633                     (u.packet.header, p->header, header_length))
 634                         return -EFAULT;
 635                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 636                     u.packet.header_length + u.packet.payload_length > 0)
 637                         return -EINVAL;
 638                 if (payload + u.packet.payload_length > payload_end)
 639                         return -EINVAL;
 640
 641                 if (fw_iso_context_queue(ctx, &u.packet,
 642                                          &client->buffer, payload))
 643                         break;
 644
 645                 p = next;
 646                 payload += u.packet.payload_length;
 647                 count++;
 648         }
 649
 650         request.size    -= uptr_to_u64(p) - request.packets;
 651         request.packets  = uptr_to_u64(p);
 652         request.data     = client->vm_start + payload;
 653
 654         if (copy_to_user(arg, &request, sizeof request))
 655                 return -EFAULT;
 656
 657         return count;
 658 }
 659
 660 static int ioctl_start_iso(struct client *client, void __user *arg)
 661 {
 662         struct fw_cdev_start_iso request;
 663
 664         if (copy_from_user(&request, arg, sizeof request))
 665                 return -EFAULT;
 666
 667         return fw_iso_context_start(client->iso_context, request.cycle);
 668 }
 669
 670 static int ioctl_stop_iso(struct client *client, void __user *arg)
 671 {
 672         return fw_iso_context_stop(client->iso_context);
 673 }
 674
 675 static int
 676 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
 677 {
 678         switch (cmd) {
 679         case FW_CDEV_IOC_GET_INFO:
 680                 return ioctl_get_info(client, arg);
 681         case FW_CDEV_IOC_SEND_REQUEST:
 682                 return ioctl_send_request(client, arg);
 683         case FW_CDEV_IOC_ALLOCATE:
 684                 return ioctl_allocate(client, arg);
 685         case FW_CDEV_IOC_SEND_RESPONSE:
 686                 return ioctl_send_response(client, arg);
 687         case FW_CDEV_IOC_INITIATE_BUS_RESET:
 688                 return ioctl_initiate_bus_reset(client, arg);
 689         case FW_CDEV_IOC_CREATE_ISO_CONTEXT:
 690                 return ioctl_create_iso_context(client, arg);
 691         case FW_CDEV_IOC_QUEUE_ISO:
 692                 return ioctl_queue_iso(client, arg);
 693         case FW_CDEV_IOC_START_ISO:
 694                 return ioctl_start_iso(client, arg);
 695         case FW_CDEV_IOC_STOP_ISO:
 696                 return ioctl_stop_iso(client, arg);
 697         default:
 698                 return -EINVAL;
 699         }
 700 }
 701
 702 static long
 703 fw_device_op_ioctl(struct file *file,
 704                    unsigned int cmd, unsigned long arg)
 705 {
 706         struct client *client = file->private_data;
 707
 708         return dispatch_ioctl(client, cmd, (void __user *) arg);
 709 }
 710
 711 #ifdef CONFIG_COMPAT
 712 static long
 713 fw_device_op_compat_ioctl(struct file *file,
 714                           unsigned int cmd, unsigned long arg)
 715 {
 716         struct client *client = file->private_data;
 717
 718         return dispatch_ioctl(client, cmd, compat_ptr(arg));
 719 }
 720 #endif
 721
 722 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
 723 {
 724         struct client *client = file->private_data;
 725         enum dma_data_direction direction;
 726         unsigned long size;
 727         int page_count, retval;
 728
 729         /* FIXME: We could support multiple buffers, but we don't. */
 730         if (client->buffer.pages != NULL)
 731                 return -EBUSY;
 732
 733         if (!(vma->vm_flags & VM_SHARED))
 734                 return -EINVAL;
 735
 736         if (vma->vm_start & ~PAGE_MASK)
 737                 return -EINVAL;
 738
 739         client->vm_start = vma->vm_start;
 740         size = vma->vm_end - vma->vm_start;
 741         page_count = size >> PAGE_SHIFT;
 742         if (size & ~PAGE_MASK)
 743                 return -EINVAL;
 744
 745         if (vma->vm_flags & VM_WRITE)
 746                 direction = DMA_TO_DEVICE;
 747         else
 748                 direction = DMA_FROM_DEVICE;
 749
 750         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
 751                                     page_count, direction);
 752         if (retval < 0)
 753                 return retval;
 754
 755         retval = fw_iso_buffer_map(&client->buffer, vma);
 756         if (retval < 0)
 757                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 758
 759         return retval;
 760 }
 761
 762 static int fw_device_op_release(struct inode *inode, struct file *file)
 763 {
 764         struct client *client = file->private_data;
 765         struct address_handler *h, *next_h;
 766         struct request *r, *next_r;
 767         struct event *e, *next_e;
 768         struct response *t, *next_t;
 769         unsigned long flags;
 770
 771         if (client->buffer.pages)
 772                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
 773
 774         if (client->iso_context)
 775                 fw_iso_context_destroy(client->iso_context);
 776
 777         list_for_each_entry_safe(h, next_h, &client->handler_list, link) {
 778                 fw_core_remove_address_handler(&h->handler);
 779                 kfree(h);
 780         }
 781
 782         list_for_each_entry_safe(r, next_r, &client->request_list, link) {
 783                 fw_send_response(client->device->card, r->request,
 784                                  RCODE_CONFLICT_ERROR);
 785                 kfree(r);
 786         }
 787
 788         list_for_each_entry_safe(t, next_t, &client->transaction_list, link)
 789                 fw_cancel_transaction(client->device->card, &t->transaction);
 790
 791         /* FIXME: We should wait for the async tasklets to stop
 792          * running before freeing the memory. */
 793
 794         list_for_each_entry_safe(e, next_e, &client->event_list, link)
 795                 kfree(e);
 796
 797         spin_lock_irqsave(&client->device->card->lock, flags);
 798         list_del(&client->link);
 799         spin_unlock_irqrestore(&client->device->card->lock, flags);
 800
 801         fw_device_put(client->device);
 802         kfree(client);
 803
 804         return 0;
 805 }
 806
 807 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
 808 {
 809         struct client *client = file->private_data;
 810         unsigned int mask = 0;
 811
 812         poll_wait(file, &client->wait, pt);
 813
 814         if (fw_device_is_shutdown(client->device))
 815                 mask |= POLLHUP | POLLERR;
 816         if (!list_empty(&client->event_list))
 817                 mask |= POLLIN | POLLRDNORM;
 818
 819         return mask;
 820 }
 821
 822 const struct file_operations fw_device_ops = {
 823         .owner          = THIS_MODULE,
 824         .open           = fw_device_op_open,
 825         .read           = fw_device_op_read,
 826         .unlocked_ioctl = fw_device_op_ioctl,
 827         .poll           = fw_device_op_poll,
 828         .release        = fw_device_op_release,
 829         .mmap           = fw_device_op_mmap,
 830
 831 #ifdef CONFIG_COMPAT
 832         .compat_ioctl   = fw_device_op_compat_ioctl,
 833 #endif
 834 };