drivers/net/irda/sir_dev.c

   1 /*********************************************************************
   2  *
   3  *      sir_dev.c:      irda sir network device
   4  *
   5  *      Copyright (c) 2002 Martin Diehl
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License as
   9  *      published by the Free Software Foundation; either version 2 of
  10  *      the License, or (at your option) any later version.
  11  *
  12  ********************************************************************/
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/smp_lock.h>
  18 #include <linux/delay.h>
  19
  20 #include <net/irda/irda.h>
  21 #include <net/irda/wrapper.h>
  22 #include <net/irda/irda_device.h>
  23
  24 #include "sir-dev.h"
  25
  26 /***************************************************************************/
  27
  28 void sirdev_enable_rx(struct sir_dev *dev)
  29 {
  30         if (unlikely(atomic_read(&dev->enable_rx)))
  31                 return;
  32
  33         /* flush rx-buffer - should also help in case of problems with echo cancelation */
  34         dev->rx_buff.data = dev->rx_buff.head;
  35         dev->rx_buff.len = 0;
  36         dev->rx_buff.in_frame = FALSE;
  37         dev->rx_buff.state = OUTSIDE_FRAME;
  38         atomic_set(&dev->enable_rx, 1);
  39 }
  40
  41 static int sirdev_is_receiving(struct sir_dev *dev)
  42 {
  43         if (!atomic_read(&dev->enable_rx))
  44                 return 0;
  45
  46         return (dev->rx_buff.state != OUTSIDE_FRAME);
  47 }
  48
  49 int sirdev_set_dongle(struct sir_dev *dev, IRDA_DONGLE type)
  50 {
  51         int err;
  52
  53         IRDA_DEBUG(3, "%s : requesting dongle %d.\n", __FUNCTION__, type);
  54
  55         err = sirdev_schedule_dongle_open(dev, type);
  56         if (unlikely(err))
  57                 return err;
  58         down(&dev->fsm.sem);            /* block until config change completed */
  59         err = dev->fsm.result;
  60         up(&dev->fsm.sem);
  61         return err;
  62 }
  63 EXPORT_SYMBOL(sirdev_set_dongle);
  64
  65 /* used by dongle drivers for dongle programming */
  66
  67 int sirdev_raw_write(struct sir_dev *dev, const char *buf, int len)
  68 {
  69         unsigned long flags;
  70         int ret;
  71
  72         if (unlikely(len > dev->tx_buff.truesize))
  73                 return -ENOSPC;
  74
  75         spin_lock_irqsave(&dev->tx_lock, flags);        /* serialize with other tx operations */
  76         while (dev->tx_buff.len > 0) {                  /* wait until tx idle */
  77                 spin_unlock_irqrestore(&dev->tx_lock, flags);
  78                 msleep(10);
  79                 spin_lock_irqsave(&dev->tx_lock, flags);
  80         }
  81
  82         dev->tx_buff.data = dev->tx_buff.head;
  83         memcpy(dev->tx_buff.data, buf, len);
  84         dev->tx_buff.len = len;
  85
  86         ret = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
  87         if (ret > 0) {
  88                 IRDA_DEBUG(3, "%s(), raw-tx started\n", __FUNCTION__);
  89
  90                 dev->tx_buff.data += ret;
  91                 dev->tx_buff.len -= ret;
  92                 dev->raw_tx = 1;
  93                 ret = len;              /* all data is going to be sent */
  94         }
  95         spin_unlock_irqrestore(&dev->tx_lock, flags);
  96         return ret;
  97 }
  98 EXPORT_SYMBOL(sirdev_raw_write);
  99
 100 /* seems some dongle drivers may need this */
 101
 102 int sirdev_raw_read(struct sir_dev *dev, char *buf, int len)
 103 {
 104         int count;
 105
 106         if (atomic_read(&dev->enable_rx))
 107                 return -EIO;            /* fail if we expect irda-frames */
 108
 109         count = (len < dev->rx_buff.len) ? len : dev->rx_buff.len;
 110
 111         if (count > 0) {
 112                 memcpy(buf, dev->rx_buff.data, count);
 113                 dev->rx_buff.data += count;
 114                 dev->rx_buff.len -= count;
 115         }
 116
 117         /* remaining stuff gets flushed when re-enabling normal rx */
 118
 119         return count;
 120 }
 121 EXPORT_SYMBOL(sirdev_raw_read);
 122
 123 int sirdev_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
 124 {
 125         int ret = -ENXIO;
 126         if (dev->drv->set_dtr_rts != 0)
 127                 ret =  dev->drv->set_dtr_rts(dev, dtr, rts);
 128         return ret;
 129 }
 130 EXPORT_SYMBOL(sirdev_set_dtr_rts);
 131
 132 /**********************************************************************/
 133
 134 /* called from client driver - likely with bh-context - to indicate
 135  * it made some progress with transmission. Hence we send the next
 136  * chunk, if any, or complete the skb otherwise
 137  */
 138
 139 void sirdev_write_complete(struct sir_dev *dev)
 140 {
 141         unsigned long flags;
 142         struct sk_buff *skb;
 143         int actual = 0;
 144         int err;
 145
 146         spin_lock_irqsave(&dev->tx_lock, flags);
 147
 148         IRDA_DEBUG(3, "%s() - dev->tx_buff.len = %d\n",
 149                    __FUNCTION__, dev->tx_buff.len);
 150
 151         if (likely(dev->tx_buff.len > 0))  {
 152                 /* Write data left in transmit buffer */
 153                 actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
 154
 155                 if (likely(actual>0)) {
 156                         dev->tx_buff.data += actual;
 157                         dev->tx_buff.len  -= actual;
 158                 }
 159                 else if (unlikely(actual<0)) {
 160                         /* could be dropped later when we have tx_timeout to recover */
 161                         IRDA_ERROR("%s: drv->do_write failed (%d)\n",
 162                                    __FUNCTION__, actual);
 163                         if ((skb=dev->tx_skb) != NULL) {
 164                                 dev->tx_skb = NULL;
 165                                 dev_kfree_skb_any(skb);
 166                                 dev->stats.tx_errors++;
 167                                 dev->stats.tx_dropped++;
 168                         }
 169                         dev->tx_buff.len = 0;
 170                 }
 171                 if (dev->tx_buff.len > 0)
 172                         goto done;      /* more data to send later */
 173         }
 174
 175         if (unlikely(dev->raw_tx != 0)) {
 176                 /* in raw mode we are just done now after the buffer was sent
 177                  * completely. Since this was requested by some dongle driver
 178                  * running under the control of the irda-thread we must take
 179                  * care here not to re-enable the queue. The queue will be
 180                  * restarted when the irda-thread has completed the request.
 181                  */
 182
 183                 IRDA_DEBUG(3, "%s(), raw-tx done\n", __FUNCTION__);
 184                 dev->raw_tx = 0;
 185                 goto done;      /* no post-frame handling in raw mode */
 186         }
 187
 188         /* we have finished now sending this skb.
 189          * update statistics and free the skb.
 190          * finally we check and trigger a pending speed change, if any.
 191          * if not we switch to rx mode and wake the queue for further
 192          * packets.
 193          * note the scheduled speed request blocks until the lower
 194          * client driver and the corresponding hardware has really
 195          * finished sending all data (xmit fifo drained f.e.)
 196          * before the speed change gets finally done and the queue
 197          * re-activated.
 198          */
 199
 200         IRDA_DEBUG(5, "%s(), finished with frame!\n", __FUNCTION__);
 201
 202         if ((skb=dev->tx_skb) != NULL) {
 203                 dev->tx_skb = NULL;
 204                 dev->stats.tx_packets++;
 205                 dev->stats.tx_bytes += skb->len;
 206                 dev_kfree_skb_any(skb);
 207         }
 208
 209         if (unlikely(dev->new_speed > 0)) {
 210                 IRDA_DEBUG(5, "%s(), Changing speed!\n", __FUNCTION__);
 211                 err = sirdev_schedule_speed(dev, dev->new_speed);
 212                 if (unlikely(err)) {
 213                         /* should never happen
 214                          * forget the speed change and hope the stack recovers
 215                          */
 216                         IRDA_ERROR("%s - schedule speed change failed: %d\n",
 217                                    __FUNCTION__, err);
 218                         netif_wake_queue(dev->netdev);
 219                 }
 220                 /* else: success
 221                  *      speed change in progress now
 222                  *      on completion dev->new_speed gets cleared,
 223                  *      rx-reenabled and the queue restarted
 224                  */
 225         }
 226         else {
 227                 sirdev_enable_rx(dev);
 228                 netif_wake_queue(dev->netdev);
 229         }
 230
 231 done:
 232         spin_unlock_irqrestore(&dev->tx_lock, flags);
 233 }
 234 EXPORT_SYMBOL(sirdev_write_complete);
 235
 236 /* called from client driver - likely with bh-context - to give us
 237  * some more received bytes. We put them into the rx-buffer,
 238  * normally unwrapping and building LAP-skb's (unless rx disabled)
 239  */
 240
 241 int sirdev_receive(struct sir_dev *dev, const unsigned char *cp, size_t count)
 242 {
 243         if (!dev || !dev->netdev) {
 244                 IRDA_WARNING("%s(), not ready yet!\n", __FUNCTION__);
 245                 return -1;
 246         }
 247
 248         if (!dev->irlap) {
 249                 IRDA_WARNING("%s - too early: %p / %zd!\n",
 250                              __FUNCTION__, cp, count);
 251                 return -1;
 252         }
 253
 254         if (cp==NULL) {
 255                 /* error already at lower level receive
 256                  * just update stats and set media busy
 257                  */
 258                 irda_device_set_media_busy(dev->netdev, TRUE);
 259                 dev->stats.rx_dropped++;
 260                 IRDA_DEBUG(0, "%s; rx-drop: %zd\n", __FUNCTION__, count);
 261                 return 0;
 262         }
 263
 264         /* Read the characters into the buffer */
 265         if (likely(atomic_read(&dev->enable_rx))) {
 266                 while (count--)
 267                         /* Unwrap and destuff one byte */
 268                         async_unwrap_char(dev->netdev, &dev->stats,
 269                                           &dev->rx_buff, *cp++);
 270         } else {
 271                 while (count--) {
 272                         /* rx not enabled: save the raw bytes and never
 273                          * trigger any netif_rx. The received bytes are flushed
 274                          * later when we re-enable rx but might be read meanwhile
 275                          * by the dongle driver.
 276                          */
 277                         dev->rx_buff.data[dev->rx_buff.len++] = *cp++;
 278
 279                         /* What should we do when the buffer is full? */
 280                         if (unlikely(dev->rx_buff.len == dev->rx_buff.truesize))
 281                                 dev->rx_buff.len = 0;
 282                 }
 283         }
 284
 285         return 0;
 286 }
 287 EXPORT_SYMBOL(sirdev_receive);
 288
 289 /**********************************************************************/
 290
 291 /* callbacks from network layer */
 292
 293 static struct net_device_stats *sirdev_get_stats(struct net_device *ndev)
 294 {
 295         struct sir_dev *dev = ndev->priv;
 296
 297         return (dev) ? &dev->stats : NULL;
 298 }
 299
 300 static int sirdev_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
 301 {
 302         struct sir_dev *dev = ndev->priv;
 303         unsigned long flags;
 304         int actual = 0;
 305         int err;
 306         s32 speed;
 307
 308         IRDA_ASSERT(dev != NULL, return 0;);
 309
 310         netif_stop_queue(ndev);
 311
 312         IRDA_DEBUG(3, "%s(), skb->len = %d\n", __FUNCTION__, skb->len);
 313
 314         speed = irda_get_next_speed(skb);
 315         if ((speed != dev->speed) && (speed != -1)) {
 316                 if (!skb->len) {
 317                         err = sirdev_schedule_speed(dev, speed);
 318                         if (unlikely(err == -EWOULDBLOCK)) {
 319                                 /* Failed to initiate the speed change, likely the fsm
 320                                  * is still busy (pretty unlikely, but...)
 321                                  * We refuse to accept the skb and return with the queue
 322                                  * stopped so the network layer will retry after the
 323                                  * fsm completes and wakes the queue.
 324                                  */
 325                                  return 1;
 326                         }
 327                         else if (unlikely(err)) {
 328                                 /* other fatal error - forget the speed change and
 329                                  * hope the stack will recover somehow
 330                                  */
 331                                  netif_start_queue(ndev);
 332                         }
 333                         /* else: success
 334                          *      speed change in progress now
 335                          *      on completion the queue gets restarted
 336                          */
 337
 338                         dev_kfree_skb_any(skb);
 339                         return 0;
 340                 } else
 341                         dev->new_speed = speed;
 342         }
 343
 344         /* Init tx buffer*/
 345         dev->tx_buff.data = dev->tx_buff.head;
 346
 347         /* Check problems */
 348         if(spin_is_locked(&dev->tx_lock)) {
 349                 IRDA_DEBUG(3, "%s(), write not completed\n", __FUNCTION__);
 350         }
 351
 352         /* serialize with write completion */
 353         spin_lock_irqsave(&dev->tx_lock, flags);
 354
 355         /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
 356         dev->tx_buff.len = async_wrap_skb(skb, dev->tx_buff.data, dev->tx_buff.truesize);
 357
 358         /* transmission will start now - disable receive.
 359          * if we are just in the middle of an incoming frame,
 360          * treat it as collision. probably it's a good idea to
 361          * reset the rx_buf OUTSIDE_FRAME in this case too?
 362          */
 363         atomic_set(&dev->enable_rx, 0);
 364         if (unlikely(sirdev_is_receiving(dev)))
 365                 dev->stats.collisions++;
 366
 367         actual = dev->drv->do_write(dev, dev->tx_buff.data, dev->tx_buff.len);
 368
 369         if (likely(actual > 0)) {
 370                 dev->tx_skb = skb;
 371                 ndev->trans_start = jiffies;
 372                 dev->tx_buff.data += actual;
 373                 dev->tx_buff.len -= actual;
 374         }
 375         else if (unlikely(actual < 0)) {
 376                 /* could be dropped later when we have tx_timeout to recover */
 377                 IRDA_ERROR("%s: drv->do_write failed (%d)\n",
 378                            __FUNCTION__, actual);
 379                 dev_kfree_skb_any(skb);
 380                 dev->stats.tx_errors++;
 381                 dev->stats.tx_dropped++;
 382                 netif_wake_queue(ndev);
 383         }
 384         spin_unlock_irqrestore(&dev->tx_lock, flags);
 385
 386         return 0;
 387 }
 388
 389 /* called from network layer with rtnl hold */
 390
 391 static int sirdev_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
 392 {
 393         struct if_irda_req *irq = (struct if_irda_req *) rq;
 394         struct sir_dev *dev = ndev->priv;
 395         int ret = 0;
 396
 397         IRDA_ASSERT(dev != NULL, return -1;);
 398
 399         IRDA_DEBUG(3, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, ndev->name, cmd);
 400
 401         switch (cmd) {
 402         case SIOCSBANDWIDTH: /* Set bandwidth */
 403                 if (!capable(CAP_NET_ADMIN))
 404                         ret = -EPERM;
 405                 else
 406                         ret = sirdev_schedule_speed(dev, irq->ifr_baudrate);
 407                 /* cannot sleep here for completion
 408                  * we are called from network layer with rtnl hold
 409                  */
 410                 break;
 411
 412         case SIOCSDONGLE: /* Set dongle */
 413                 if (!capable(CAP_NET_ADMIN))
 414                         ret = -EPERM;
 415                 else
 416                         ret = sirdev_schedule_dongle_open(dev, irq->ifr_dongle);
 417                 /* cannot sleep here for completion
 418                  * we are called from network layer with rtnl hold
 419                  */
 420                 break;
 421
 422         case SIOCSMEDIABUSY: /* Set media busy */
 423                 if (!capable(CAP_NET_ADMIN))
 424                         ret = -EPERM;
 425                 else
 426                         irda_device_set_media_busy(dev->netdev, TRUE);
 427                 break;
 428
 429         case SIOCGRECEIVING: /* Check if we are receiving right now */
 430                 irq->ifr_receiving = sirdev_is_receiving(dev);
 431                 break;
 432
 433         case SIOCSDTRRTS:
 434                 if (!capable(CAP_NET_ADMIN))
 435                         ret = -EPERM;
 436                 else
 437                         ret = sirdev_schedule_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
 438                 /* cannot sleep here for completion
 439                  * we are called from network layer with rtnl hold
 440                  */
 441                 break;
 442
 443         case SIOCSMODE:
 444 #if 0
 445                 if (!capable(CAP_NET_ADMIN))
 446                         ret = -EPERM;
 447                 else
 448                         ret = sirdev_schedule_mode(dev, irq->ifr_mode);
 449                 /* cannot sleep here for completion
 450                  * we are called from network layer with rtnl hold
 451                  */
 452                 break;
 453 #endif
 454         default:
 455                 ret = -EOPNOTSUPP;
 456         }
 457
 458         return ret;
 459 }
 460
 461 /* ----------------------------------------------------------------------------- */
 462
 463 #define SIRBUF_ALLOCSIZE 4269   /* worst case size of a wrapped IrLAP frame */
 464
 465 static int sirdev_alloc_buffers(struct sir_dev *dev)
 466 {
 467         dev->tx_buff.truesize = SIRBUF_ALLOCSIZE;
 468         dev->rx_buff.truesize = IRDA_SKB_MAX_MTU;
 469
 470         /* Bootstrap ZeroCopy Rx */
 471         dev->rx_buff.skb = __dev_alloc_skb(dev->rx_buff.truesize, GFP_KERNEL);
 472         if (dev->rx_buff.skb == NULL)
 473                 return -ENOMEM;
 474         skb_reserve(dev->rx_buff.skb, 1);
 475         dev->rx_buff.head = dev->rx_buff.skb->data;
 476
 477         dev->tx_buff.head = kmalloc(dev->tx_buff.truesize, GFP_KERNEL);
 478         if (dev->tx_buff.head == NULL) {
 479                 kfree_skb(dev->rx_buff.skb);
 480                 dev->rx_buff.skb = NULL;
 481                 dev->rx_buff.head = NULL;
 482                 return -ENOMEM;
 483         }
 484
 485         dev->tx_buff.data = dev->tx_buff.head;
 486         dev->rx_buff.data = dev->rx_buff.head;
 487         dev->tx_buff.len = 0;
 488         dev->rx_buff.len = 0;
 489
 490         dev->rx_buff.in_frame = FALSE;
 491         dev->rx_buff.state = OUTSIDE_FRAME;
 492         return 0;
 493 };
 494
 495 static void sirdev_free_buffers(struct sir_dev *dev)
 496 {
 497         if (dev->rx_buff.skb)
 498                 kfree_skb(dev->rx_buff.skb);
 499         kfree(dev->tx_buff.head);
 500         dev->rx_buff.head = dev->tx_buff.head = NULL;
 501         dev->rx_buff.skb = NULL;
 502 }
 503
 504 static int sirdev_open(struct net_device *ndev)
 505 {
 506         struct sir_dev *dev = ndev->priv;
 507         const struct sir_driver *drv = dev->drv;
 508
 509         if (!drv)
 510                 return -ENODEV;
 511
 512         /* increase the reference count of the driver module before doing serious stuff */
 513         if (!try_module_get(drv->owner))
 514                 return -ESTALE;
 515
 516         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 517
 518         if (sirdev_alloc_buffers(dev))
 519                 goto errout_dec;
 520
 521         if (!dev->drv->start_dev  ||  dev->drv->start_dev(dev))
 522                 goto errout_free;
 523
 524         sirdev_enable_rx(dev);
 525         dev->raw_tx = 0;
 526
 527         netif_start_queue(ndev);
 528         dev->irlap = irlap_open(ndev, &dev->qos, dev->hwname);
 529         if (!dev->irlap)
 530                 goto errout_stop;
 531
 532         netif_wake_queue(ndev);
 533
 534         IRDA_DEBUG(2, "%s - done, speed = %d\n", __FUNCTION__, dev->speed);
 535
 536         return 0;
 537
 538 errout_stop:
 539         atomic_set(&dev->enable_rx, 0);
 540         if (dev->drv->stop_dev)
 541                 dev->drv->stop_dev(dev);
 542 errout_free:
 543         sirdev_free_buffers(dev);
 544 errout_dec:
 545         module_put(drv->owner);
 546         return -EAGAIN;
 547 }
 548
 549 static int sirdev_close(struct net_device *ndev)
 550 {
 551         struct sir_dev *dev = ndev->priv;
 552         const struct sir_driver *drv;
 553
 554 //      IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 555
 556         netif_stop_queue(ndev);
 557
 558         down(&dev->fsm.sem);            /* block on pending config completion */
 559
 560         atomic_set(&dev->enable_rx, 0);
 561
 562         if (unlikely(!dev->irlap))
 563                 goto out;
 564         irlap_close(dev->irlap);
 565         dev->irlap = NULL;
 566
 567         drv = dev->drv;
 568         if (unlikely(!drv  ||  !dev->priv))
 569                 goto out;
 570
 571         if (drv->stop_dev)
 572                 drv->stop_dev(dev);
 573
 574         sirdev_free_buffers(dev);
 575         module_put(drv->owner);
 576
 577 out:
 578         dev->speed = 0;
 579         up(&dev->fsm.sem);
 580         return 0;
 581 }
 582
 583 /* ----------------------------------------------------------------------------- */
 584
 585 struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *name)
 586 {
 587         struct net_device *ndev;
 588         struct sir_dev *dev;
 589
 590         IRDA_DEBUG(0, "%s - %s\n", __FUNCTION__, name);
 591
 592         /* instead of adding tests to protect against drv->do_write==NULL
 593          * at several places we refuse to create a sir_dev instance for
 594          * drivers which don't implement do_write.
 595          */
 596         if (!drv ||  !drv->do_write)
 597                 return NULL;
 598
 599         /*
 600          *  Allocate new instance of the device
 601          */
 602         ndev = alloc_irdadev(sizeof(*dev));
 603         if (ndev == NULL) {
 604                 IRDA_ERROR("%s - Can't allocate memory for IrDA control block!\n", __FUNCTION__);
 605                 goto out;
 606         }
 607         dev = ndev->priv;
 608
 609         irda_init_max_qos_capabilies(&dev->qos);
 610         dev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
 611         dev->qos.min_turn_time.bits = drv->qos_mtt_bits;
 612         irda_qos_bits_to_value(&dev->qos);
 613
 614         strncpy(dev->hwname, name, sizeof(dev->hwname)-1);
 615
 616         atomic_set(&dev->enable_rx, 0);
 617         dev->tx_skb = NULL;
 618
 619         spin_lock_init(&dev->tx_lock);
 620         init_MUTEX(&dev->fsm.sem);
 621
 622         INIT_LIST_HEAD(&dev->fsm.rq.lh_request);
 623         dev->fsm.rq.pending = 0;
 624         init_timer(&dev->fsm.rq.timer);
 625
 626         dev->drv = drv;
 627         dev->netdev = ndev;
 628
 629         SET_MODULE_OWNER(ndev);
 630
 631         /* Override the network functions we need to use */
 632         ndev->hard_start_xmit = sirdev_hard_xmit;
 633         ndev->open = sirdev_open;
 634         ndev->stop = sirdev_close;
 635         ndev->get_stats = sirdev_get_stats;
 636         ndev->do_ioctl = sirdev_ioctl;
 637
 638         if (register_netdev(ndev)) {
 639                 IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
 640                 goto out_freenetdev;
 641         }
 642
 643         return dev;
 644
 645 out_freenetdev:
 646         free_netdev(ndev);
 647 out:
 648         return NULL;
 649 }
 650 EXPORT_SYMBOL(sirdev_get_instance);
 651
 652 int sirdev_put_instance(struct sir_dev *dev)
 653 {
 654         int err = 0;
 655
 656         IRDA_DEBUG(0, "%s\n", __FUNCTION__);
 657
 658         atomic_set(&dev->enable_rx, 0);
 659
 660         netif_carrier_off(dev->netdev);
 661         netif_device_detach(dev->netdev);
 662
 663         if (dev->dongle_drv)
 664                 err = sirdev_schedule_dongle_close(dev);
 665         if (err)
 666                 IRDA_ERROR("%s - error %d\n", __FUNCTION__, err);
 667
 668         sirdev_close(dev->netdev);
 669
 670         down(&dev->fsm.sem);
 671         dev->fsm.state = SIRDEV_STATE_DEAD;     /* mark staled */
 672         dev->dongle_drv = NULL;
 673         dev->priv = NULL;
 674         up(&dev->fsm.sem);
 675
 676         /* Remove netdevice */
 677         unregister_netdev(dev->netdev);
 678
 679         free_netdev(dev->netdev);
 680
 681         return 0;
 682 }
 683 EXPORT_SYMBOL(sirdev_put_instance);
 684