drivers/net/usb/kaweth.c

   1 /****************************************************************
   2  *
   3  *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
   4  *
   5  *     (c) 2000 Interlan Communications
   6  *     (c) 2000 Stephane Alnet
   7  *     (C) 2001 Brad Hards
   8  *     (C) 2002 Oliver Neukum
   9  *
  10  *     Original author: The Zapman <zapman@interlan.net>
  11  *     Inspired by, and much credit goes to Michael Rothwell
  12  *     <rothwell@interlan.net> for the test equipment, help, and patience
  13  *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
  14  *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
  15  *     for providing the firmware and driver resources.
  16  *
  17  *     This program is free software; you can redistribute it and/or
  18  *     modify it under the terms of the GNU General Public License as
  19  *     published by the Free Software Foundation; either version 2, or
  20  *     (at your option) any later version.
  21  *
  22  *     This program is distributed in the hope that it will be useful,
  23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *     GNU General Public License for more details.
  26  *
  27  *     You should have received a copy of the GNU General Public License
  28  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  29  *
  30  ****************************************************************/
  31
  32 /* TODO:
  33  * Develop test procedures for USB net interfaces
  34  * Run test procedures
  35  * Fix bugs from previous two steps
  36  * Snoop other OSs for any tricks we're not doing
  37  * Reduce arbitrary timeouts
  38  * Smart multicast support
  39  * Temporary MAC change support
  40  * Tunable SOFs parameter - ioctl()?
  41  * Ethernet stats collection
  42  * Code formatting improvements
  43  */
  44
  45 #include <linux/module.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/delay.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/usb.h>
  52 #include <linux/types.h>
  53 #include <linux/ethtool.h>
  54 #include <linux/dma-mapping.h>
  55 #include <linux/wait.h>
  56 #include <linux/firmware.h>
  57 #include <linux/uaccess.h>
  58 #include <asm/byteorder.h>
  59
  60 #undef DEBUG
  61
  62 #define KAWETH_MTU                      1514
  63 #define KAWETH_BUF_SIZE                 1664
  64 #define KAWETH_TX_TIMEOUT               (5 * HZ)
  65 #define KAWETH_SCRATCH_SIZE             32
  66 #define KAWETH_FIRMWARE_BUF_SIZE        4096
  67 #define KAWETH_CONTROL_TIMEOUT          (30000)
  68
  69 #define KAWETH_STATUS_BROKEN            0x0000001
  70 #define KAWETH_STATUS_CLOSING           0x0000002
  71 #define KAWETH_STATUS_SUSPENDING        0x0000004
  72
  73 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
  74
  75 #define KAWETH_PACKET_FILTER_PROMISCUOUS        0x01
  76 #define KAWETH_PACKET_FILTER_ALL_MULTICAST      0x02
  77 #define KAWETH_PACKET_FILTER_DIRECTED           0x04
  78 #define KAWETH_PACKET_FILTER_BROADCAST          0x08
  79 #define KAWETH_PACKET_FILTER_MULTICAST          0x10
  80
  81 /* Table 7 */
  82 #define KAWETH_COMMAND_GET_ETHERNET_DESC        0x00
  83 #define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
  84 #define KAWETH_COMMAND_SET_PACKET_FILTER        0x02
  85 #define KAWETH_COMMAND_STATISTICS               0x03
  86 #define KAWETH_COMMAND_SET_TEMP_MAC             0x06
  87 #define KAWETH_COMMAND_GET_TEMP_MAC             0x07
  88 #define KAWETH_COMMAND_SET_URB_SIZE             0x08
  89 #define KAWETH_COMMAND_SET_SOFS_WAIT            0x09
  90 #define KAWETH_COMMAND_SCAN                     0xFF
  91
  92 #define KAWETH_SOFS_TO_WAIT                     0x05
  93
  94 #define INTBUFFERSIZE                           4
  95
  96 #define STATE_OFFSET                            0
  97 #define STATE_MASK                              0x40
  98 #define STATE_SHIFT                             5
  99
 100 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
 101
 102
 103 MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
 104 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
 105 MODULE_LICENSE("GPL");
 106 MODULE_FIRMWARE("kaweth/new_code.bin");
 107 MODULE_FIRMWARE("kaweth/new_code_fix.bin");
 108 MODULE_FIRMWARE("kaweth/trigger_code.bin");
 109 MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
 110
 111 static const char driver_name[] = "kaweth";
 112
 113 static int kaweth_probe(
 114                 struct usb_interface *intf,
 115                 const struct usb_device_id *id  /* from id_table */
 116         );
 117 static void kaweth_disconnect(struct usb_interface *intf);
 118 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
 119                                        unsigned int pipe,
 120                                        struct usb_ctrlrequest *cmd, void *data,
 121                                        int len, int timeout);
 122 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 123 static int kaweth_resume(struct usb_interface *intf);
 124
 125 /****************************************************************
 126  *     usb_device_id
 127  ****************************************************************/
 128 static struct usb_device_id usb_klsi_table[] = {
 129         { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 130         { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 131         { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 132         { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 133         { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 134         { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 135         { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 136         { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 137         { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 138         { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 139         { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 140         { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 141         { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 142         { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 143         { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 144         { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 145         { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 146         { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 147         { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 148         { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 149         { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 150         { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 151         { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 152         { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 153         { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 154         { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 155         { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 156         { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 157         { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
 158         { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 159         { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 160         { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 161         { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 162         { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 163         { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 164         {} /* Null terminator */
 165 };
 166
 167 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 168
 169 /****************************************************************
 170  *     kaweth_driver
 171  ****************************************************************/
 172 static struct usb_driver kaweth_driver = {
 173         .name =         driver_name,
 174         .probe =        kaweth_probe,
 175         .disconnect =   kaweth_disconnect,
 176         .suspend =      kaweth_suspend,
 177         .resume =       kaweth_resume,
 178         .id_table =     usb_klsi_table,
 179         .supports_autosuspend = 1,
 180         .disable_hub_initiated_lpm = 1,
 181 };
 182
 183 typedef __u8 eth_addr_t[6];
 184
 185 /****************************************************************
 186  *     usb_eth_dev
 187  ****************************************************************/
 188 struct usb_eth_dev {
 189         char *name;
 190         __u16 vendor;
 191         __u16 device;
 192         void *pdata;
 193 };
 194
 195 /****************************************************************
 196  *     kaweth_ethernet_configuration
 197  *     Refer Table 8
 198  ****************************************************************/
 199 struct kaweth_ethernet_configuration
 200 {
 201         __u8 size;
 202         __u8 reserved1;
 203         __u8 reserved2;
 204         eth_addr_t hw_addr;
 205         __u32 statistics_mask;
 206         __le16 segment_size;
 207         __u16 max_multicast_filters;
 208         __u8 reserved3;
 209 } __packed;
 210
 211 /****************************************************************
 212  *     kaweth_device
 213  ****************************************************************/
 214 struct kaweth_device
 215 {
 216         spinlock_t device_lock;
 217
 218         __u32 status;
 219         int end;
 220         int suspend_lowmem_rx;
 221         int suspend_lowmem_ctrl;
 222         int linkstate;
 223         int opened;
 224         struct delayed_work lowmem_work;
 225
 226         struct usb_device *dev;
 227         struct usb_interface *intf;
 228         struct net_device *net;
 229         wait_queue_head_t term_wait;
 230
 231         struct urb *rx_urb;
 232         struct urb *tx_urb;
 233         struct urb *irq_urb;
 234
 235         dma_addr_t intbufferhandle;
 236         __u8 *intbuffer;
 237         dma_addr_t rxbufferhandle;
 238         __u8 *rx_buf;
 239
 240
 241         struct sk_buff *tx_skb;
 242
 243         __u8 *firmware_buf;
 244         __u8 scratch[KAWETH_SCRATCH_SIZE];
 245         __u16 packet_filter_bitmap;
 246
 247         struct kaweth_ethernet_configuration configuration;
 248
 249         struct net_device_stats stats;
 250 };
 251
 252 /****************************************************************
 253  *     kaweth_control
 254  ****************************************************************/
 255 static int kaweth_control(struct kaweth_device *kaweth,
 256                           unsigned int pipe,
 257                           __u8 request,
 258                           __u8 requesttype,
 259                           __u16 value,
 260                           __u16 index,
 261                           void *data,
 262                           __u16 size,
 263                           int timeout)
 264 {
 265         struct usb_ctrlrequest *dr;
 266         int retval;
 267
 268         if(in_interrupt()) {
 269                 netdev_dbg(kaweth->net, "in_interrupt()\n");
 270                 return -EBUSY;
 271         }
 272
 273         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
 274         if (!dr)
 275                 return -ENOMEM;
 276
 277         dr->bRequestType = requesttype;
 278         dr->bRequest = request;
 279         dr->wValue = cpu_to_le16(value);
 280         dr->wIndex = cpu_to_le16(index);
 281         dr->wLength = cpu_to_le16(size);
 282
 283         retval = kaweth_internal_control_msg(kaweth->dev,
 284                                              pipe,
 285                                              dr,
 286                                              data,
 287                                              size,
 288                                              timeout);
 289
 290         kfree(dr);
 291         return retval;
 292 }
 293
 294 /****************************************************************
 295  *     kaweth_read_configuration
 296  ****************************************************************/
 297 static int kaweth_read_configuration(struct kaweth_device *kaweth)
 298 {
 299         int retval;
 300
 301         retval = kaweth_control(kaweth,
 302                                 usb_rcvctrlpipe(kaweth->dev, 0),
 303                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
 304                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 305                                 0,
 306                                 0,
 307                                 (void *)&kaweth->configuration,
 308                                 sizeof(kaweth->configuration),
 309                                 KAWETH_CONTROL_TIMEOUT);
 310
 311         return retval;
 312 }
 313
 314 /****************************************************************
 315  *     kaweth_set_urb_size
 316  ****************************************************************/
 317 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 318 {
 319         int retval;
 320
 321         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
 322
 323         retval = kaweth_control(kaweth,
 324                                 usb_sndctrlpipe(kaweth->dev, 0),
 325                                 KAWETH_COMMAND_SET_URB_SIZE,
 326                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 327                                 urb_size,
 328                                 0,
 329                                 (void *)&kaweth->scratch,
 330                                 0,
 331                                 KAWETH_CONTROL_TIMEOUT);
 332
 333         return retval;
 334 }
 335
 336 /****************************************************************
 337  *     kaweth_set_sofs_wait
 338  ****************************************************************/
 339 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 340 {
 341         int retval;
 342
 343         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
 344
 345         retval = kaweth_control(kaweth,
 346                                 usb_sndctrlpipe(kaweth->dev, 0),
 347                                 KAWETH_COMMAND_SET_SOFS_WAIT,
 348                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 349                                 sofs_wait,
 350                                 0,
 351                                 (void *)&kaweth->scratch,
 352                                 0,
 353                                 KAWETH_CONTROL_TIMEOUT);
 354
 355         return retval;
 356 }
 357
 358 /****************************************************************
 359  *     kaweth_set_receive_filter
 360  ****************************************************************/
 361 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 362                                      __u16 receive_filter)
 363 {
 364         int retval;
 365
 366         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
 367                    (unsigned)receive_filter);
 368
 369         retval = kaweth_control(kaweth,
 370                                 usb_sndctrlpipe(kaweth->dev, 0),
 371                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 372                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 373                                 receive_filter,
 374                                 0,
 375                                 (void *)&kaweth->scratch,
 376                                 0,
 377                                 KAWETH_CONTROL_TIMEOUT);
 378
 379         return retval;
 380 }
 381
 382 /****************************************************************
 383  *     kaweth_download_firmware
 384  ****************************************************************/
 385 static int kaweth_download_firmware(struct kaweth_device *kaweth,
 386                                     const char *fwname,
 387                                     __u8 interrupt,
 388                                     __u8 type)
 389 {
 390         const struct firmware *fw;
 391         int data_len;
 392         int ret;
 393
 394         ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
 395         if (ret) {
 396                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
 397                 return ret;
 398         }
 399
 400         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 401                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
 402                         fw->size);
 403                 release_firmware(fw);
 404                 return -ENOSPC;
 405         }
 406         data_len = fw->size;
 407         memcpy(kaweth->firmware_buf, fw->data, fw->size);
 408
 409         release_firmware(fw);
 410
 411         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 412         kaweth->firmware_buf[3] = data_len >> 8;
 413         kaweth->firmware_buf[4] = type;
 414         kaweth->firmware_buf[5] = interrupt;
 415
 416         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
 417                    kaweth->firmware_buf[2]);
 418
 419         netdev_dbg(kaweth->net,
 420                    "Downloading firmware at %p to kaweth device at %p\n",
 421                    kaweth->firmware_buf, kaweth);
 422         netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
 423
 424         return kaweth_control(kaweth,
 425                               usb_sndctrlpipe(kaweth->dev, 0),
 426                               KAWETH_COMMAND_SCAN,
 427                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 428                               0,
 429                               0,
 430                               (void *)kaweth->firmware_buf,
 431                               data_len,
 432                               KAWETH_CONTROL_TIMEOUT);
 433 }
 434
 435 /****************************************************************
 436  *     kaweth_trigger_firmware
 437  ****************************************************************/
 438 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
 439                                    __u8 interrupt)
 440 {
 441         kaweth->firmware_buf[0] = 0xB6;
 442         kaweth->firmware_buf[1] = 0xC3;
 443         kaweth->firmware_buf[2] = 0x01;
 444         kaweth->firmware_buf[3] = 0x00;
 445         kaweth->firmware_buf[4] = 0x06;
 446         kaweth->firmware_buf[5] = interrupt;
 447         kaweth->firmware_buf[6] = 0x00;
 448         kaweth->firmware_buf[7] = 0x00;
 449
 450         return kaweth_control(kaweth,
 451                               usb_sndctrlpipe(kaweth->dev, 0),
 452                               KAWETH_COMMAND_SCAN,
 453                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 454                               0,
 455                               0,
 456                               (void *)kaweth->firmware_buf,
 457                               8,
 458                               KAWETH_CONTROL_TIMEOUT);
 459 }
 460
 461 /****************************************************************
 462  *     kaweth_reset
 463  ****************************************************************/
 464 static int kaweth_reset(struct kaweth_device *kaweth)
 465 {
 466         int result;
 467
 468         result = usb_reset_configuration(kaweth->dev);
 469         mdelay(10);
 470
 471         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
 472
 473         return result;
 474 }
 475
 476 static void kaweth_usb_receive(struct urb *);
 477 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
 478
 479 /****************************************************************
 480         int_callback
 481 *****************************************************************/
 482
 483 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
 484 {
 485         int status;
 486
 487         status = usb_submit_urb (kaweth->irq_urb, mf);
 488         if (unlikely(status == -ENOMEM)) {
 489                 kaweth->suspend_lowmem_ctrl = 1;
 490                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 491         } else {
 492                 kaweth->suspend_lowmem_ctrl = 0;
 493         }
 494
 495         if (status)
 496                 dev_err(&kaweth->intf->dev,
 497                         "can't resubmit intr, %s-%s, status %d\n",
 498                         kaweth->dev->bus->bus_name,
 499                         kaweth->dev->devpath, status);
 500 }
 501
 502 static void int_callback(struct urb *u)
 503 {
 504         struct kaweth_device *kaweth = u->context;
 505         int act_state;
 506         int status = u->status;
 507
 508         switch (status) {
 509         case 0:                 /* success */
 510                 break;
 511         case -ECONNRESET:       /* unlink */
 512         case -ENOENT:
 513         case -ESHUTDOWN:
 514                 return;
 515         /* -EPIPE:  should clear the halt */
 516         default:                /* error */
 517                 goto resubmit;
 518         }
 519
 520         /* we check the link state to report changes */
 521         if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
 522                 if (act_state)
 523                         netif_carrier_on(kaweth->net);
 524                 else
 525                         netif_carrier_off(kaweth->net);
 526
 527                 kaweth->linkstate = act_state;
 528         }
 529 resubmit:
 530         kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
 531 }
 532
 533 static void kaweth_resubmit_tl(struct work_struct *work)
 534 {
 535         struct kaweth_device *kaweth =
 536                 container_of(work, struct kaweth_device, lowmem_work.work);
 537
 538         if (IS_BLOCKED(kaweth->status))
 539                 return;
 540
 541         if (kaweth->suspend_lowmem_rx)
 542                 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 543
 544         if (kaweth->suspend_lowmem_ctrl)
 545                 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 546 }
 547
 548
 549 /****************************************************************
 550  *     kaweth_resubmit_rx_urb
 551  ****************************************************************/
 552 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
 553                                                 gfp_t mem_flags)
 554 {
 555         int result;
 556
 557         usb_fill_bulk_urb(kaweth->rx_urb,
 558                       kaweth->dev,
 559                       usb_rcvbulkpipe(kaweth->dev, 1),
 560                       kaweth->rx_buf,
 561                       KAWETH_BUF_SIZE,
 562                       kaweth_usb_receive,
 563                       kaweth);
 564         kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 565         kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
 566
 567         if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
 568                 if (result == -ENOMEM) {
 569                         kaweth->suspend_lowmem_rx = 1;
 570                         schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 571                 }
 572                 dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
 573                         result);
 574         } else {
 575                 kaweth->suspend_lowmem_rx = 0;
 576         }
 577
 578         return result;
 579 }
 580
 581 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
 582
 583 /****************************************************************
 584  *     kaweth_usb_receive
 585  ****************************************************************/
 586 static void kaweth_usb_receive(struct urb *urb)
 587 {
 588         struct device *dev = &urb->dev->dev;
 589         struct kaweth_device *kaweth = urb->context;
 590         struct net_device *net = kaweth->net;
 591         int status = urb->status;
 592
 593         int count = urb->actual_length;
 594         int count2 = urb->transfer_buffer_length;
 595
 596         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 597
 598         struct sk_buff *skb;
 599
 600         if (unlikely(status == -EPIPE)) {
 601                 kaweth->stats.rx_errors++;
 602                 kaweth->end = 1;
 603                 wake_up(&kaweth->term_wait);
 604                 dev_dbg(dev, "Status was -EPIPE.\n");
 605                 return;
 606         }
 607         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 608                 /* we are killed - set a flag and wake the disconnect handler */
 609                 kaweth->end = 1;
 610                 wake_up(&kaweth->term_wait);
 611                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
 612                 return;
 613         }
 614         if (unlikely(status == -EPROTO || status == -ETIME ||
 615                      status == -EILSEQ)) {
 616                 kaweth->stats.rx_errors++;
 617                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
 618                 return;
 619         }
 620         if (unlikely(status == -EOVERFLOW)) {
 621                 kaweth->stats.rx_errors++;
 622                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
 623         }
 624         spin_lock(&kaweth->device_lock);
 625         if (IS_BLOCKED(kaweth->status)) {
 626                 spin_unlock(&kaweth->device_lock);
 627                 return;
 628         }
 629         spin_unlock(&kaweth->device_lock);
 630
 631         if(status && status != -EREMOTEIO && count != 1) {
 632                 dev_err(&kaweth->intf->dev,
 633                         "%s RX status: %d count: %d packet_len: %d\n",
 634                         net->name, status, count, (int)pkt_len);
 635                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 636                 return;
 637         }
 638
 639         if(kaweth->net && (count > 2)) {
 640                 if(pkt_len > (count - 2)) {
 641                         dev_err(&kaweth->intf->dev,
 642                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
 643                                 pkt_len, count);
 644                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
 645                                 pkt_len & 2047);
 646                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
 647                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 648                         return;
 649                 }
 650
 651                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
 652                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 653                         return;
 654                 }
 655
 656                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 657
 658                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 659
 660                 skb_put(skb, pkt_len);
 661
 662                 skb->protocol = eth_type_trans(skb, net);
 663
 664                 netif_rx(skb);
 665
 666                 kaweth->stats.rx_packets++;
 667                 kaweth->stats.rx_bytes += pkt_len;
 668         }
 669
 670         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 671 }
 672
 673 /****************************************************************
 674  *     kaweth_open
 675  ****************************************************************/
 676 static int kaweth_open(struct net_device *net)
 677 {
 678         struct kaweth_device *kaweth = netdev_priv(net);
 679         int res;
 680
 681         res = usb_autopm_get_interface(kaweth->intf);
 682         if (res) {
 683                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
 684                 return -EIO;
 685         }
 686         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 687         if (res)
 688                 goto err_out;
 689
 690         usb_fill_int_urb(
 691                 kaweth->irq_urb,
 692                 kaweth->dev,
 693                 usb_rcvintpipe(kaweth->dev, 3),
 694                 kaweth->intbuffer,
 695                 INTBUFFERSIZE,
 696                 int_callback,
 697                 kaweth,
 698                 250); /* overriding the descriptor */
 699         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 700         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 701
 702         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 703         if (res) {
 704                 usb_kill_urb(kaweth->rx_urb);
 705                 goto err_out;
 706         }
 707         kaweth->opened = 1;
 708
 709         netif_start_queue(net);
 710
 711         kaweth_async_set_rx_mode(kaweth);
 712         return 0;
 713
 714 err_out:
 715         usb_autopm_put_interface(kaweth->intf);
 716         return -EIO;
 717 }
 718
 719 /****************************************************************
 720  *     kaweth_kill_urbs
 721  ****************************************************************/
 722 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 723 {
 724         usb_kill_urb(kaweth->irq_urb);
 725         usb_kill_urb(kaweth->rx_urb);
 726         usb_kill_urb(kaweth->tx_urb);
 727
 728         cancel_delayed_work_sync(&kaweth->lowmem_work);
 729
 730         /* a scheduled work may have resubmitted,
 731            we hit them again */
 732         usb_kill_urb(kaweth->irq_urb);
 733         usb_kill_urb(kaweth->rx_urb);
 734 }
 735
 736 /****************************************************************
 737  *     kaweth_close
 738  ****************************************************************/
 739 static int kaweth_close(struct net_device *net)
 740 {
 741         struct kaweth_device *kaweth = netdev_priv(net);
 742
 743         netif_stop_queue(net);
 744         kaweth->opened = 0;
 745
 746         kaweth->status |= KAWETH_STATUS_CLOSING;
 747
 748         kaweth_kill_urbs(kaweth);
 749
 750         kaweth->status &= ~KAWETH_STATUS_CLOSING;
 751
 752         usb_autopm_put_interface(kaweth->intf);
 753
 754         return 0;
 755 }
 756
 757 static u32 kaweth_get_link(struct net_device *dev)
 758 {
 759         struct kaweth_device *kaweth = netdev_priv(dev);
 760
 761         return kaweth->linkstate;
 762 }
 763
 764 static const struct ethtool_ops ops = {
 765         .get_link       = kaweth_get_link
 766 };
 767
 768 /****************************************************************
 769  *     kaweth_usb_transmit_complete
 770  ****************************************************************/
 771 static void kaweth_usb_transmit_complete(struct urb *urb)
 772 {
 773         struct kaweth_device *kaweth = urb->context;
 774         struct sk_buff *skb = kaweth->tx_skb;
 775         int status = urb->status;
 776
 777         if (unlikely(status != 0))
 778                 if (status != -ENOENT)
 779                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
 780                                 kaweth->net->name, status);
 781
 782         netif_wake_queue(kaweth->net);
 783         dev_kfree_skb_irq(skb);
 784 }
 785
 786 /****************************************************************
 787  *     kaweth_start_xmit
 788  ****************************************************************/
 789 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 790                                            struct net_device *net)
 791 {
 792         struct kaweth_device *kaweth = netdev_priv(net);
 793         __le16 *private_header;
 794
 795         int res;
 796
 797         spin_lock_irq(&kaweth->device_lock);
 798
 799         kaweth_async_set_rx_mode(kaweth);
 800         netif_stop_queue(net);
 801         if (IS_BLOCKED(kaweth->status)) {
 802                 goto skip;
 803         }
 804
 805         /* We now decide whether we can put our special header into the sk_buff */
 806         if (skb_cow_head(skb, 2)) {
 807                 kaweth->stats.tx_errors++;
 808                 netif_start_queue(net);
 809                 spin_unlock_irq(&kaweth->device_lock);
 810                 dev_kfree_skb_any(skb);
 811                 return NETDEV_TX_OK;
 812         }
 813
 814         private_header = (__le16 *)__skb_push(skb, 2);
 815         *private_header = cpu_to_le16(skb->len-2);
 816         kaweth->tx_skb = skb;
 817
 818         usb_fill_bulk_urb(kaweth->tx_urb,
 819                       kaweth->dev,
 820                       usb_sndbulkpipe(kaweth->dev, 2),
 821                       private_header,
 822                       skb->len,
 823                       kaweth_usb_transmit_complete,
 824                       kaweth);
 825         kaweth->end = 0;
 826
 827         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 828         {
 829                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 830 skip:
 831                 kaweth->stats.tx_errors++;
 832
 833                 netif_start_queue(net);
 834                 dev_kfree_skb_irq(skb);
 835         }
 836         else
 837         {
 838                 kaweth->stats.tx_packets++;
 839                 kaweth->stats.tx_bytes += skb->len;
 840         }
 841
 842         spin_unlock_irq(&kaweth->device_lock);
 843
 844         return NETDEV_TX_OK;
 845 }
 846
 847 /****************************************************************
 848  *     kaweth_set_rx_mode
 849  ****************************************************************/
 850 static void kaweth_set_rx_mode(struct net_device *net)
 851 {
 852         struct kaweth_device *kaweth = netdev_priv(net);
 853
 854         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 855                                      KAWETH_PACKET_FILTER_BROADCAST |
 856                                      KAWETH_PACKET_FILTER_MULTICAST;
 857
 858         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
 859
 860         netif_stop_queue(net);
 861
 862         if (net->flags & IFF_PROMISC) {
 863                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 864         }
 865         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 866                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 867         }
 868
 869         kaweth->packet_filter_bitmap = packet_filter_bitmap;
 870         netif_wake_queue(net);
 871 }
 872
 873 /****************************************************************
 874  *     kaweth_async_set_rx_mode
 875  ****************************************************************/
 876 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 877 {
 878         int result;
 879         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 880
 881         kaweth->packet_filter_bitmap = 0;
 882         if (packet_filter_bitmap == 0)
 883                 return;
 884
 885         if (in_interrupt())
 886                 return;
 887
 888         result = kaweth_control(kaweth,
 889                                 usb_sndctrlpipe(kaweth->dev, 0),
 890                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 891                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 892                                 packet_filter_bitmap,
 893                                 0,
 894                                 (void *)&kaweth->scratch,
 895                                 0,
 896                                 KAWETH_CONTROL_TIMEOUT);
 897
 898         if(result < 0) {
 899                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
 900                         result);
 901         }
 902         else {
 903                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
 904                            packet_filter_bitmap);
 905         }
 906 }
 907
 908 /****************************************************************
 909  *     kaweth_netdev_stats
 910  ****************************************************************/
 911 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
 912 {
 913         struct kaweth_device *kaweth = netdev_priv(dev);
 914         return &kaweth->stats;
 915 }
 916
 917 /****************************************************************
 918  *     kaweth_tx_timeout
 919  ****************************************************************/
 920 static void kaweth_tx_timeout(struct net_device *net)
 921 {
 922         struct kaweth_device *kaweth = netdev_priv(net);
 923
 924         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 925         kaweth->stats.tx_errors++;
 926         netif_trans_update(net);
 927
 928         usb_unlink_urb(kaweth->tx_urb);
 929 }
 930
 931 /****************************************************************
 932  *     kaweth_suspend
 933  ****************************************************************/
 934 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 935 {
 936         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 937         unsigned long flags;
 938
 939         spin_lock_irqsave(&kaweth->device_lock, flags);
 940         kaweth->status |= KAWETH_STATUS_SUSPENDING;
 941         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 942
 943         kaweth_kill_urbs(kaweth);
 944         return 0;
 945 }
 946
 947 /****************************************************************
 948  *     kaweth_resume
 949  ****************************************************************/
 950 static int kaweth_resume(struct usb_interface *intf)
 951 {
 952         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 953         unsigned long flags;
 954
 955         spin_lock_irqsave(&kaweth->device_lock, flags);
 956         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 957         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 958
 959         if (!kaweth->opened)
 960                 return 0;
 961         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 962         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 963
 964         return 0;
 965 }
 966
 967 /****************************************************************
 968  *     kaweth_probe
 969  ****************************************************************/
 970
 971
 972 static const struct net_device_ops kaweth_netdev_ops = {
 973         .ndo_open =                     kaweth_open,
 974         .ndo_stop =                     kaweth_close,
 975         .ndo_start_xmit =               kaweth_start_xmit,
 976         .ndo_tx_timeout =               kaweth_tx_timeout,
 977         .ndo_set_rx_mode =              kaweth_set_rx_mode,
 978         .ndo_get_stats =                kaweth_netdev_stats,
 979         .ndo_set_mac_address =          eth_mac_addr,
 980         .ndo_validate_addr =            eth_validate_addr,
 981 };
 982
 983 static int kaweth_probe(
 984                 struct usb_interface *intf,
 985                 const struct usb_device_id *id      /* from id_table */
 986         )
 987 {
 988         struct device *dev = &intf->dev;
 989         struct usb_device *udev = interface_to_usbdev(intf);
 990         struct kaweth_device *kaweth;
 991         struct net_device *netdev;
 992         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 993         int result = 0;
 994         int rv = -EIO;
 995
 996         dev_dbg(dev,
 997                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
 998                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
 999                 le16_to_cpu(udev->descriptor.idProduct),
1000                 le16_to_cpu(udev->descriptor.bcdDevice));
1001
1002         dev_dbg(dev, "Device at %p\n", udev);
1003
1004         dev_dbg(dev, "Descriptor length: %x type: %x\n",
1005                 (int)udev->descriptor.bLength,
1006                 (int)udev->descriptor.bDescriptorType);
1007
1008         netdev = alloc_etherdev(sizeof(*kaweth));
1009         if (!netdev)
1010                 return -ENOMEM;
1011
1012         kaweth = netdev_priv(netdev);
1013         kaweth->dev = udev;
1014         kaweth->net = netdev;
1015         kaweth->intf = intf;
1016
1017         spin_lock_init(&kaweth->device_lock);
1018         init_waitqueue_head(&kaweth->term_wait);
1019
1020         dev_dbg(dev, "Resetting.\n");
1021
1022         kaweth_reset(kaweth);
1023
1024         /*
1025          * If high byte of bcdDevice is nonzero, firmware is already
1026          * downloaded. Don't try to do it again, or we'll hang the device.
1027          */
1028
1029         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1030                 dev_info(dev, "Firmware present in device.\n");
1031         } else {
1032                 /* Download the firmware */
1033                 dev_info(dev, "Downloading firmware...\n");
1034                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1035                 if (!kaweth->firmware_buf) {
1036                         rv = -ENOMEM;
1037                         goto err_free_netdev;
1038                 }
1039                 if ((result = kaweth_download_firmware(kaweth,
1040                                                       "kaweth/new_code.bin",
1041                                                       100,
1042                                                       2)) < 0) {
1043                         dev_err(dev, "Error downloading firmware (%d)\n",
1044                                 result);
1045                         goto err_fw;
1046                 }
1047
1048                 if ((result = kaweth_download_firmware(kaweth,
1049                                                       "kaweth/new_code_fix.bin",
1050                                                       100,
1051                                                       3)) < 0) {
1052                         dev_err(dev, "Error downloading firmware fix (%d)\n",
1053                                 result);
1054                         goto err_fw;
1055                 }
1056
1057                 if ((result = kaweth_download_firmware(kaweth,
1058                                                       "kaweth/trigger_code.bin",
1059                                                       126,
1060                                                       2)) < 0) {
1061                         dev_err(dev, "Error downloading trigger code (%d)\n",
1062                                 result);
1063                         goto err_fw;
1064
1065                 }
1066
1067                 if ((result = kaweth_download_firmware(kaweth,
1068                                                       "kaweth/trigger_code_fix.bin",
1069                                                       126,
1070                                                       3)) < 0) {
1071                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1072                         goto err_fw;
1073                 }
1074
1075
1076                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1077                         dev_err(dev, "Error triggering firmware (%d)\n", result);
1078                         goto err_fw;
1079                 }
1080
1081                 /* Device will now disappear for a moment...  */
1082                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
1083 err_fw:
1084                 free_page((unsigned long)kaweth->firmware_buf);
1085                 free_netdev(netdev);
1086                 return -EIO;
1087         }
1088
1089         result = kaweth_read_configuration(kaweth);
1090
1091         if(result < 0) {
1092                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1093                 goto err_free_netdev;
1094         }
1095
1096         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1097         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1098         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1099         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1100
1101         if(!memcmp(&kaweth->configuration.hw_addr,
1102                    &bcast_addr,
1103                    sizeof(bcast_addr))) {
1104                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
1105                 goto err_free_netdev;
1106         }
1107
1108         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1109                 dev_dbg(dev, "Error setting URB size\n");
1110                 goto err_free_netdev;
1111         }
1112
1113         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1114                 dev_err(dev, "Error setting SOFS wait\n");
1115                 goto err_free_netdev;
1116         }
1117
1118         result = kaweth_set_receive_filter(kaweth,
1119                                            KAWETH_PACKET_FILTER_DIRECTED |
1120                                            KAWETH_PACKET_FILTER_BROADCAST |
1121                                            KAWETH_PACKET_FILTER_MULTICAST);
1122
1123         if(result < 0) {
1124                 dev_err(dev, "Error setting receive filter\n");
1125                 goto err_free_netdev;
1126         }
1127
1128         dev_dbg(dev, "Initializing net device.\n");
1129
1130         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1131         if (!kaweth->tx_urb)
1132                 goto err_free_netdev;
1133         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1134         if (!kaweth->rx_urb)
1135                 goto err_only_tx;
1136         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1137         if (!kaweth->irq_urb)
1138                 goto err_tx_and_rx;
1139
1140         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1141                                                 INTBUFFERSIZE,
1142                                                 GFP_KERNEL,
1143                                                 &kaweth->intbufferhandle);
1144         if (!kaweth->intbuffer)
1145                 goto err_tx_and_rx_and_irq;
1146         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1147                                                 KAWETH_BUF_SIZE,
1148                                                 GFP_KERNEL,
1149                                                 &kaweth->rxbufferhandle);
1150         if (!kaweth->rx_buf)
1151                 goto err_all_but_rxbuf;
1152
1153         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1154         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1155                sizeof(kaweth->configuration.hw_addr));
1156
1157         netdev->netdev_ops = &kaweth_netdev_ops;
1158         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1159         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1160         netdev->ethtool_ops = &ops;
1161
1162         /* kaweth is zeroed as part of alloc_netdev */
1163         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1164         usb_set_intfdata(intf, kaweth);
1165
1166         SET_NETDEV_DEV(netdev, dev);
1167         if (register_netdev(netdev) != 0) {
1168                 dev_err(dev, "Error registering netdev.\n");
1169                 goto err_intfdata;
1170         }
1171
1172         dev_info(dev, "kaweth interface created at %s\n",
1173                  kaweth->net->name);
1174
1175         return 0;
1176
1177 err_intfdata:
1178         usb_set_intfdata(intf, NULL);
1179         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1180 err_all_but_rxbuf:
1181         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1182 err_tx_and_rx_and_irq:
1183         usb_free_urb(kaweth->irq_urb);
1184 err_tx_and_rx:
1185         usb_free_urb(kaweth->rx_urb);
1186 err_only_tx:
1187         usb_free_urb(kaweth->tx_urb);
1188 err_free_netdev:
1189         free_netdev(netdev);
1190
1191         return rv;
1192 }
1193
1194 /****************************************************************
1195  *     kaweth_disconnect
1196  ****************************************************************/
1197 static void kaweth_disconnect(struct usb_interface *intf)
1198 {
1199         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1200         struct net_device *netdev;
1201
1202         usb_set_intfdata(intf, NULL);
1203         if (!kaweth) {
1204                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1205                 return;
1206         }
1207         netdev = kaweth->net;
1208
1209         netdev_dbg(kaweth->net, "Unregistering net device\n");
1210         unregister_netdev(netdev);
1211
1212         usb_free_urb(kaweth->rx_urb);
1213         usb_free_urb(kaweth->tx_urb);
1214         usb_free_urb(kaweth->irq_urb);
1215
1216         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1217         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1218
1219         free_netdev(netdev);
1220 }
1221
1222
1223 // FIXME this completion stuff is a modified clone of
1224 // an OLD version of some stuff in usb.c ...
1225 struct usb_api_data {
1226         wait_queue_head_t wqh;
1227         int done;
1228 };
1229
1230 /*-------------------------------------------------------------------*
1231  * completion handler for compatibility wrappers (sync control/bulk) *
1232  *-------------------------------------------------------------------*/
1233 static void usb_api_blocking_completion(struct urb *urb)
1234 {
1235         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1236
1237         awd->done=1;
1238         wake_up(&awd->wqh);
1239 }
1240
1241 /*-------------------------------------------------------------------*
1242  *                         COMPATIBILITY STUFF                       *
1243  *-------------------------------------------------------------------*/
1244
1245 // Starts urb and waits for completion or timeout
1246 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1247 {
1248         struct usb_api_data awd;
1249         int status;
1250
1251         init_waitqueue_head(&awd.wqh);
1252         awd.done = 0;
1253
1254         urb->context = &awd;
1255         status = usb_submit_urb(urb, GFP_ATOMIC);
1256         if (status) {
1257                 // something went wrong
1258                 usb_free_urb(urb);
1259                 return status;
1260         }
1261
1262         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1263                 // timeout
1264                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1265                 usb_kill_urb(urb);  // remove urb safely
1266                 status = -ETIMEDOUT;
1267         }
1268         else {
1269                 status = urb->status;
1270         }
1271
1272         if (actual_length) {
1273                 *actual_length = urb->actual_length;
1274         }
1275
1276         usb_free_urb(urb);
1277         return status;
1278 }
1279
1280 /*-------------------------------------------------------------------*/
1281 // returns status (negative) or length (positive)
1282 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1283                                        unsigned int pipe,
1284                                        struct usb_ctrlrequest *cmd, void *data,
1285                                        int len, int timeout)
1286 {
1287         struct urb *urb;
1288         int retv;
1289         int length = 0; /* shut up GCC */
1290
1291         urb = usb_alloc_urb(0, GFP_ATOMIC);
1292         if (!urb)
1293                 return -ENOMEM;
1294
1295         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1296                          len, usb_api_blocking_completion, NULL);
1297
1298         retv = usb_start_wait_urb(urb, timeout, &length);
1299         if (retv < 0) {
1300                 return retv;
1301         }
1302         else {
1303                 return length;
1304         }
1305 }
1306
1307 module_usb_driver(kaweth_driver);