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 <asm/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 /*(DEBLOBBED)*/
 107
 108 static const char driver_name[] = "kaweth";
 109
 110 static int kaweth_probe(
 111                 struct usb_interface *intf,
 112                 const struct usb_device_id *id  /* from id_table */
 113         );
 114 static void kaweth_disconnect(struct usb_interface *intf);
 115 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
 116                                        unsigned int pipe,
 117                                        struct usb_ctrlrequest *cmd, void *data,
 118                                        int len, int timeout);
 119 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 120 static int kaweth_resume(struct usb_interface *intf);
 121
 122 /****************************************************************
 123  *     usb_device_id
 124  ****************************************************************/
 125 static struct usb_device_id usb_klsi_table[] = {
 126         { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 127         { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 128         { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 129         { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 130         { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 131         { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 132         { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 133         { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 134         { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 135         { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 136         { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 137         { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 138         { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 139         { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 140         { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 141         { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 142         { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 143         { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 144         { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 145         { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 146         { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 147         { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 148         { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 149         { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 150         { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 151         { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 152         { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 153         { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 154         { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
 155         { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 156         { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 157         { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 158         { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 159         { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 160         { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 161         {} /* Null terminator */
 162 };
 163
 164 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 165
 166 /****************************************************************
 167  *     kaweth_driver
 168  ****************************************************************/
 169 static struct usb_driver kaweth_driver = {
 170         .name =         driver_name,
 171         .probe =        kaweth_probe,
 172         .disconnect =   kaweth_disconnect,
 173         .suspend =      kaweth_suspend,
 174         .resume =       kaweth_resume,
 175         .id_table =     usb_klsi_table,
 176         .supports_autosuspend = 1,
 177         .disable_hub_initiated_lpm = 1,
 178 };
 179
 180 typedef __u8 eth_addr_t[6];
 181
 182 /****************************************************************
 183  *     usb_eth_dev
 184  ****************************************************************/
 185 struct usb_eth_dev {
 186         char *name;
 187         __u16 vendor;
 188         __u16 device;
 189         void *pdata;
 190 };
 191
 192 /****************************************************************
 193  *     kaweth_ethernet_configuration
 194  *     Refer Table 8
 195  ****************************************************************/
 196 struct kaweth_ethernet_configuration
 197 {
 198         __u8 size;
 199         __u8 reserved1;
 200         __u8 reserved2;
 201         eth_addr_t hw_addr;
 202         __u32 statistics_mask;
 203         __le16 segment_size;
 204         __u16 max_multicast_filters;
 205         __u8 reserved3;
 206 } __packed;
 207
 208 /****************************************************************
 209  *     kaweth_device
 210  ****************************************************************/
 211 struct kaweth_device
 212 {
 213         spinlock_t device_lock;
 214
 215         __u32 status;
 216         int end;
 217         int suspend_lowmem_rx;
 218         int suspend_lowmem_ctrl;
 219         int linkstate;
 220         int opened;
 221         struct delayed_work lowmem_work;
 222
 223         struct usb_device *dev;
 224         struct usb_interface *intf;
 225         struct net_device *net;
 226         wait_queue_head_t term_wait;
 227
 228         struct urb *rx_urb;
 229         struct urb *tx_urb;
 230         struct urb *irq_urb;
 231
 232         dma_addr_t intbufferhandle;
 233         __u8 *intbuffer;
 234         dma_addr_t rxbufferhandle;
 235         __u8 *rx_buf;
 236
 237
 238         struct sk_buff *tx_skb;
 239
 240         __u8 *firmware_buf;
 241         __u8 scratch[KAWETH_SCRATCH_SIZE];
 242         __u16 packet_filter_bitmap;
 243
 244         struct kaweth_ethernet_configuration configuration;
 245
 246         struct net_device_stats stats;
 247 };
 248
 249 /****************************************************************
 250  *     kaweth_control
 251  ****************************************************************/
 252 static int kaweth_control(struct kaweth_device *kaweth,
 253                           unsigned int pipe,
 254                           __u8 request,
 255                           __u8 requesttype,
 256                           __u16 value,
 257                           __u16 index,
 258                           void *data,
 259                           __u16 size,
 260                           int timeout)
 261 {
 262         struct usb_ctrlrequest *dr;
 263         int retval;
 264
 265         netdev_dbg(kaweth->net, "kaweth_control()\n");
 266
 267         if(in_interrupt()) {
 268                 netdev_dbg(kaweth->net, "in_interrupt()\n");
 269                 return -EBUSY;
 270         }
 271
 272         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
 273         if (!dr)
 274                 return -ENOMEM;
 275
 276         dr->bRequestType = requesttype;
 277         dr->bRequest = request;
 278         dr->wValue = cpu_to_le16(value);
 279         dr->wIndex = cpu_to_le16(index);
 280         dr->wLength = cpu_to_le16(size);
 281
 282         retval = kaweth_internal_control_msg(kaweth->dev,
 283                                              pipe,
 284                                              dr,
 285                                              data,
 286                                              size,
 287                                              timeout);
 288
 289         kfree(dr);
 290         return retval;
 291 }
 292
 293 /****************************************************************
 294  *     kaweth_read_configuration
 295  ****************************************************************/
 296 static int kaweth_read_configuration(struct kaweth_device *kaweth)
 297 {
 298         int retval;
 299
 300         netdev_dbg(kaweth->net, "Reading kaweth configuration\n");
 301
 302         retval = kaweth_control(kaweth,
 303                                 usb_rcvctrlpipe(kaweth->dev, 0),
 304                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
 305                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 306                                 0,
 307                                 0,
 308                                 (void *)&kaweth->configuration,
 309                                 sizeof(kaweth->configuration),
 310                                 KAWETH_CONTROL_TIMEOUT);
 311
 312         return retval;
 313 }
 314
 315 /****************************************************************
 316  *     kaweth_set_urb_size
 317  ****************************************************************/
 318 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 319 {
 320         int retval;
 321
 322         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
 323
 324         retval = kaweth_control(kaweth,
 325                                 usb_sndctrlpipe(kaweth->dev, 0),
 326                                 KAWETH_COMMAND_SET_URB_SIZE,
 327                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 328                                 urb_size,
 329                                 0,
 330                                 (void *)&kaweth->scratch,
 331                                 0,
 332                                 KAWETH_CONTROL_TIMEOUT);
 333
 334         return retval;
 335 }
 336
 337 /****************************************************************
 338  *     kaweth_set_sofs_wait
 339  ****************************************************************/
 340 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 341 {
 342         int retval;
 343
 344         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
 345
 346         retval = kaweth_control(kaweth,
 347                                 usb_sndctrlpipe(kaweth->dev, 0),
 348                                 KAWETH_COMMAND_SET_SOFS_WAIT,
 349                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 350                                 sofs_wait,
 351                                 0,
 352                                 (void *)&kaweth->scratch,
 353                                 0,
 354                                 KAWETH_CONTROL_TIMEOUT);
 355
 356         return retval;
 357 }
 358
 359 /****************************************************************
 360  *     kaweth_set_receive_filter
 361  ****************************************************************/
 362 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 363                                      __u16 receive_filter)
 364 {
 365         int retval;
 366
 367         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
 368                    (unsigned)receive_filter);
 369
 370         retval = kaweth_control(kaweth,
 371                                 usb_sndctrlpipe(kaweth->dev, 0),
 372                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 373                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 374                                 receive_filter,
 375                                 0,
 376                                 (void *)&kaweth->scratch,
 377                                 0,
 378                                 KAWETH_CONTROL_TIMEOUT);
 379
 380         return retval;
 381 }
 382
 383 /****************************************************************
 384  *     kaweth_download_firmware
 385  ****************************************************************/
 386 static int kaweth_download_firmware(struct kaweth_device *kaweth,
 387                                     const char *fwname,
 388                                     __u8 interrupt,
 389                                     __u8 type)
 390 {
 391         const struct firmware *fw;
 392         int data_len;
 393         int ret;
 394
 395         ret = reject_firmware(&fw, fwname, &kaweth->dev->dev);
 396         if (ret) {
 397                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
 398                 return ret;
 399         }
 400
 401         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 402                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
 403                         fw->size);
 404                 release_firmware(fw);
 405                 return -ENOSPC;
 406         }
 407         data_len = fw->size;
 408         memcpy(kaweth->firmware_buf, fw->data, fw->size);
 409
 410         release_firmware(fw);
 411
 412         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 413         kaweth->firmware_buf[3] = data_len >> 8;
 414         kaweth->firmware_buf[4] = type;
 415         kaweth->firmware_buf[5] = interrupt;
 416
 417         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
 418                    kaweth->firmware_buf[2]);
 419
 420         netdev_dbg(kaweth->net,
 421                    "Downloading firmware at %p to kaweth device at %p\n",
 422                    kaweth->firmware_buf, kaweth);
 423         netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
 424
 425         return kaweth_control(kaweth,
 426                               usb_sndctrlpipe(kaweth->dev, 0),
 427                               KAWETH_COMMAND_SCAN,
 428                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 429                               0,
 430                               0,
 431                               (void *)kaweth->firmware_buf,
 432                               data_len,
 433                               KAWETH_CONTROL_TIMEOUT);
 434 }
 435
 436 /****************************************************************
 437  *     kaweth_trigger_firmware
 438  ****************************************************************/
 439 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
 440                                    __u8 interrupt)
 441 {
 442         kaweth->firmware_buf[0] = 0xB6;
 443         kaweth->firmware_buf[1] = 0xC3;
 444         kaweth->firmware_buf[2] = 0x01;
 445         kaweth->firmware_buf[3] = 0x00;
 446         kaweth->firmware_buf[4] = 0x06;
 447         kaweth->firmware_buf[5] = interrupt;
 448         kaweth->firmware_buf[6] = 0x00;
 449         kaweth->firmware_buf[7] = 0x00;
 450
 451         netdev_dbg(kaweth->net, "Triggering firmware\n");
 452
 453         return kaweth_control(kaweth,
 454                               usb_sndctrlpipe(kaweth->dev, 0),
 455                               KAWETH_COMMAND_SCAN,
 456                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 457                               0,
 458                               0,
 459                               (void *)kaweth->firmware_buf,
 460                               8,
 461                               KAWETH_CONTROL_TIMEOUT);
 462 }
 463
 464 /****************************************************************
 465  *     kaweth_reset
 466  ****************************************************************/
 467 static int kaweth_reset(struct kaweth_device *kaweth)
 468 {
 469         int result;
 470
 471         netdev_dbg(kaweth->net, "kaweth_reset(%p)\n", kaweth);
 472         result = usb_reset_configuration(kaweth->dev);
 473         mdelay(10);
 474
 475         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
 476
 477         return result;
 478 }
 479
 480 static void kaweth_usb_receive(struct urb *);
 481 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
 482
 483 /****************************************************************
 484         int_callback
 485 *****************************************************************/
 486
 487 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
 488 {
 489         int status;
 490
 491         status = usb_submit_urb (kaweth->irq_urb, mf);
 492         if (unlikely(status == -ENOMEM)) {
 493                 kaweth->suspend_lowmem_ctrl = 1;
 494                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 495         } else {
 496                 kaweth->suspend_lowmem_ctrl = 0;
 497         }
 498
 499         if (status)
 500                 dev_err(&kaweth->intf->dev,
 501                         "can't resubmit intr, %s-%s, status %d\n",
 502                         kaweth->dev->bus->bus_name,
 503                         kaweth->dev->devpath, status);
 504 }
 505
 506 static void int_callback(struct urb *u)
 507 {
 508         struct kaweth_device *kaweth = u->context;
 509         int act_state;
 510         int status = u->status;
 511
 512         switch (status) {
 513         case 0:                 /* success */
 514                 break;
 515         case -ECONNRESET:       /* unlink */
 516         case -ENOENT:
 517         case -ESHUTDOWN:
 518                 return;
 519         /* -EPIPE:  should clear the halt */
 520         default:                /* error */
 521                 goto resubmit;
 522         }
 523
 524         /* we check the link state to report changes */
 525         if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
 526                 if (act_state)
 527                         netif_carrier_on(kaweth->net);
 528                 else
 529                         netif_carrier_off(kaweth->net);
 530
 531                 kaweth->linkstate = act_state;
 532         }
 533 resubmit:
 534         kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
 535 }
 536
 537 static void kaweth_resubmit_tl(struct work_struct *work)
 538 {
 539         struct kaweth_device *kaweth =
 540                 container_of(work, struct kaweth_device, lowmem_work.work);
 541
 542         if (IS_BLOCKED(kaweth->status))
 543                 return;
 544
 545         if (kaweth->suspend_lowmem_rx)
 546                 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 547
 548         if (kaweth->suspend_lowmem_ctrl)
 549                 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 550 }
 551
 552
 553 /****************************************************************
 554  *     kaweth_resubmit_rx_urb
 555  ****************************************************************/
 556 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
 557                                                 gfp_t mem_flags)
 558 {
 559         int result;
 560
 561         usb_fill_bulk_urb(kaweth->rx_urb,
 562                       kaweth->dev,
 563                       usb_rcvbulkpipe(kaweth->dev, 1),
 564                       kaweth->rx_buf,
 565                       KAWETH_BUF_SIZE,
 566                       kaweth_usb_receive,
 567                       kaweth);
 568         kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 569         kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
 570
 571         if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
 572                 if (result == -ENOMEM) {
 573                         kaweth->suspend_lowmem_rx = 1;
 574                         schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 575                 }
 576                 dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
 577                         result);
 578         } else {
 579                 kaweth->suspend_lowmem_rx = 0;
 580         }
 581
 582         return result;
 583 }
 584
 585 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
 586
 587 /****************************************************************
 588  *     kaweth_usb_receive
 589  ****************************************************************/
 590 static void kaweth_usb_receive(struct urb *urb)
 591 {
 592         struct device *dev = &urb->dev->dev;
 593         struct kaweth_device *kaweth = urb->context;
 594         struct net_device *net = kaweth->net;
 595         int status = urb->status;
 596
 597         int count = urb->actual_length;
 598         int count2 = urb->transfer_buffer_length;
 599
 600         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 601
 602         struct sk_buff *skb;
 603
 604         if (unlikely(status == -EPIPE)) {
 605                 kaweth->stats.rx_errors++;
 606                 kaweth->end = 1;
 607                 wake_up(&kaweth->term_wait);
 608                 dev_dbg(dev, "Status was -EPIPE.\n");
 609                 return;
 610         }
 611         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 612                 /* we are killed - set a flag and wake the disconnect handler */
 613                 kaweth->end = 1;
 614                 wake_up(&kaweth->term_wait);
 615                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
 616                 return;
 617         }
 618         if (unlikely(status == -EPROTO || status == -ETIME ||
 619                      status == -EILSEQ)) {
 620                 kaweth->stats.rx_errors++;
 621                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
 622                 return;
 623         }
 624         if (unlikely(status == -EOVERFLOW)) {
 625                 kaweth->stats.rx_errors++;
 626                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
 627         }
 628         spin_lock(&kaweth->device_lock);
 629         if (IS_BLOCKED(kaweth->status)) {
 630                 spin_unlock(&kaweth->device_lock);
 631                 return;
 632         }
 633         spin_unlock(&kaweth->device_lock);
 634
 635         if(status && status != -EREMOTEIO && count != 1) {
 636                 dev_err(&kaweth->intf->dev,
 637                         "%s RX status: %d count: %d packet_len: %d\n",
 638                         net->name, status, count, (int)pkt_len);
 639                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 640                 return;
 641         }
 642
 643         if(kaweth->net && (count > 2)) {
 644                 if(pkt_len > (count - 2)) {
 645                         dev_err(&kaweth->intf->dev,
 646                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
 647                                 pkt_len, count);
 648                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
 649                                 pkt_len & 2047);
 650                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
 651                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 652                         return;
 653                 }
 654
 655                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
 656                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 657                         return;
 658                 }
 659
 660                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 661
 662                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 663
 664                 skb_put(skb, pkt_len);
 665
 666                 skb->protocol = eth_type_trans(skb, net);
 667
 668                 netif_rx(skb);
 669
 670                 kaweth->stats.rx_packets++;
 671                 kaweth->stats.rx_bytes += pkt_len;
 672         }
 673
 674         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 675 }
 676
 677 /****************************************************************
 678  *     kaweth_open
 679  ****************************************************************/
 680 static int kaweth_open(struct net_device *net)
 681 {
 682         struct kaweth_device *kaweth = netdev_priv(net);
 683         int res;
 684
 685         netdev_dbg(kaweth->net, "Opening network device.\n");
 686
 687         res = usb_autopm_get_interface(kaweth->intf);
 688         if (res) {
 689                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
 690                 return -EIO;
 691         }
 692         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 693         if (res)
 694                 goto err_out;
 695
 696         usb_fill_int_urb(
 697                 kaweth->irq_urb,
 698                 kaweth->dev,
 699                 usb_rcvintpipe(kaweth->dev, 3),
 700                 kaweth->intbuffer,
 701                 INTBUFFERSIZE,
 702                 int_callback,
 703                 kaweth,
 704                 250); /* overriding the descriptor */
 705         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 706         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 707
 708         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 709         if (res) {
 710                 usb_kill_urb(kaweth->rx_urb);
 711                 goto err_out;
 712         }
 713         kaweth->opened = 1;
 714
 715         netif_start_queue(net);
 716
 717         kaweth_async_set_rx_mode(kaweth);
 718         return 0;
 719
 720 err_out:
 721         usb_autopm_put_interface(kaweth->intf);
 722         return -EIO;
 723 }
 724
 725 /****************************************************************
 726  *     kaweth_kill_urbs
 727  ****************************************************************/
 728 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 729 {
 730         usb_kill_urb(kaweth->irq_urb);
 731         usb_kill_urb(kaweth->rx_urb);
 732         usb_kill_urb(kaweth->tx_urb);
 733
 734         cancel_delayed_work_sync(&kaweth->lowmem_work);
 735
 736         /* a scheduled work may have resubmitted,
 737            we hit them again */
 738         usb_kill_urb(kaweth->irq_urb);
 739         usb_kill_urb(kaweth->rx_urb);
 740 }
 741
 742 /****************************************************************
 743  *     kaweth_close
 744  ****************************************************************/
 745 static int kaweth_close(struct net_device *net)
 746 {
 747         struct kaweth_device *kaweth = netdev_priv(net);
 748
 749         netif_stop_queue(net);
 750         kaweth->opened = 0;
 751
 752         kaweth->status |= KAWETH_STATUS_CLOSING;
 753
 754         kaweth_kill_urbs(kaweth);
 755
 756         kaweth->status &= ~KAWETH_STATUS_CLOSING;
 757
 758         usb_autopm_put_interface(kaweth->intf);
 759
 760         return 0;
 761 }
 762
 763 static u32 kaweth_get_link(struct net_device *dev)
 764 {
 765         struct kaweth_device *kaweth = netdev_priv(dev);
 766
 767         return kaweth->linkstate;
 768 }
 769
 770 static const struct ethtool_ops ops = {
 771         .get_link       = kaweth_get_link
 772 };
 773
 774 /****************************************************************
 775  *     kaweth_usb_transmit_complete
 776  ****************************************************************/
 777 static void kaweth_usb_transmit_complete(struct urb *urb)
 778 {
 779         struct kaweth_device *kaweth = urb->context;
 780         struct sk_buff *skb = kaweth->tx_skb;
 781         int status = urb->status;
 782
 783         if (unlikely(status != 0))
 784                 if (status != -ENOENT)
 785                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
 786                                 kaweth->net->name, status);
 787
 788         netif_wake_queue(kaweth->net);
 789         dev_kfree_skb_irq(skb);
 790 }
 791
 792 /****************************************************************
 793  *     kaweth_start_xmit
 794  ****************************************************************/
 795 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 796                                            struct net_device *net)
 797 {
 798         struct kaweth_device *kaweth = netdev_priv(net);
 799         __le16 *private_header;
 800
 801         int res;
 802
 803         spin_lock_irq(&kaweth->device_lock);
 804
 805         kaweth_async_set_rx_mode(kaweth);
 806         netif_stop_queue(net);
 807         if (IS_BLOCKED(kaweth->status)) {
 808                 goto skip;
 809         }
 810
 811         /* We now decide whether we can put our special header into the sk_buff */
 812         if (skb_cow_head(skb, 2)) {
 813                 kaweth->stats.tx_errors++;
 814                 netif_start_queue(net);
 815                 spin_unlock_irq(&kaweth->device_lock);
 816                 dev_kfree_skb_any(skb);
 817                 return NETDEV_TX_OK;
 818         }
 819
 820         private_header = (__le16 *)__skb_push(skb, 2);
 821         *private_header = cpu_to_le16(skb->len-2);
 822         kaweth->tx_skb = skb;
 823
 824         usb_fill_bulk_urb(kaweth->tx_urb,
 825                       kaweth->dev,
 826                       usb_sndbulkpipe(kaweth->dev, 2),
 827                       private_header,
 828                       skb->len,
 829                       kaweth_usb_transmit_complete,
 830                       kaweth);
 831         kaweth->end = 0;
 832
 833         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 834         {
 835                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 836 skip:
 837                 kaweth->stats.tx_errors++;
 838
 839                 netif_start_queue(net);
 840                 dev_kfree_skb_irq(skb);
 841         }
 842         else
 843         {
 844                 kaweth->stats.tx_packets++;
 845                 kaweth->stats.tx_bytes += skb->len;
 846         }
 847
 848         spin_unlock_irq(&kaweth->device_lock);
 849
 850         return NETDEV_TX_OK;
 851 }
 852
 853 /****************************************************************
 854  *     kaweth_set_rx_mode
 855  ****************************************************************/
 856 static void kaweth_set_rx_mode(struct net_device *net)
 857 {
 858         struct kaweth_device *kaweth = netdev_priv(net);
 859
 860         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 861                                      KAWETH_PACKET_FILTER_BROADCAST |
 862                                      KAWETH_PACKET_FILTER_MULTICAST;
 863
 864         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
 865
 866         netif_stop_queue(net);
 867
 868         if (net->flags & IFF_PROMISC) {
 869                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 870         }
 871         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 872                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 873         }
 874
 875         kaweth->packet_filter_bitmap = packet_filter_bitmap;
 876         netif_wake_queue(net);
 877 }
 878
 879 /****************************************************************
 880  *     kaweth_async_set_rx_mode
 881  ****************************************************************/
 882 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 883 {
 884         int result;
 885         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 886
 887         kaweth->packet_filter_bitmap = 0;
 888         if (packet_filter_bitmap == 0)
 889                 return;
 890
 891         if (in_interrupt())
 892                 return;
 893
 894         result = kaweth_control(kaweth,
 895                                 usb_sndctrlpipe(kaweth->dev, 0),
 896                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 897                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 898                                 packet_filter_bitmap,
 899                                 0,
 900                                 (void *)&kaweth->scratch,
 901                                 0,
 902                                 KAWETH_CONTROL_TIMEOUT);
 903
 904         if(result < 0) {
 905                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
 906                         result);
 907         }
 908         else {
 909                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
 910                            packet_filter_bitmap);
 911         }
 912 }
 913
 914 /****************************************************************
 915  *     kaweth_netdev_stats
 916  ****************************************************************/
 917 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
 918 {
 919         struct kaweth_device *kaweth = netdev_priv(dev);
 920         return &kaweth->stats;
 921 }
 922
 923 /****************************************************************
 924  *     kaweth_tx_timeout
 925  ****************************************************************/
 926 static void kaweth_tx_timeout(struct net_device *net)
 927 {
 928         struct kaweth_device *kaweth = netdev_priv(net);
 929
 930         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 931         kaweth->stats.tx_errors++;
 932         net->trans_start = jiffies;
 933
 934         usb_unlink_urb(kaweth->tx_urb);
 935 }
 936
 937 /****************************************************************
 938  *     kaweth_suspend
 939  ****************************************************************/
 940 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 941 {
 942         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 943         unsigned long flags;
 944
 945         dev_dbg(&intf->dev, "Suspending device\n");
 946         spin_lock_irqsave(&kaweth->device_lock, flags);
 947         kaweth->status |= KAWETH_STATUS_SUSPENDING;
 948         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 949
 950         kaweth_kill_urbs(kaweth);
 951         return 0;
 952 }
 953
 954 /****************************************************************
 955  *     kaweth_resume
 956  ****************************************************************/
 957 static int kaweth_resume(struct usb_interface *intf)
 958 {
 959         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 960         unsigned long flags;
 961
 962         dev_dbg(&intf->dev, "Resuming device\n");
 963         spin_lock_irqsave(&kaweth->device_lock, flags);
 964         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 965         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 966
 967         if (!kaweth->opened)
 968                 return 0;
 969         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 970         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 971
 972         return 0;
 973 }
 974
 975 /****************************************************************
 976  *     kaweth_probe
 977  ****************************************************************/
 978
 979
 980 static const struct net_device_ops kaweth_netdev_ops = {
 981         .ndo_open =                     kaweth_open,
 982         .ndo_stop =                     kaweth_close,
 983         .ndo_start_xmit =               kaweth_start_xmit,
 984         .ndo_tx_timeout =               kaweth_tx_timeout,
 985         .ndo_set_rx_mode =              kaweth_set_rx_mode,
 986         .ndo_get_stats =                kaweth_netdev_stats,
 987         .ndo_change_mtu =               eth_change_mtu,
 988         .ndo_set_mac_address =          eth_mac_addr,
 989         .ndo_validate_addr =            eth_validate_addr,
 990 };
 991
 992 static int kaweth_probe(
 993                 struct usb_interface *intf,
 994                 const struct usb_device_id *id      /* from id_table */
 995         )
 996 {
 997         struct device *dev = &intf->dev;
 998         struct usb_device *udev = interface_to_usbdev(intf);
 999         struct kaweth_device *kaweth;
1000         struct net_device *netdev;
1001         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1002         int result = 0;
1003         int rv = -EIO;
1004
1005         dev_dbg(dev,
1006                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1007                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1008                 le16_to_cpu(udev->descriptor.idProduct),
1009                 le16_to_cpu(udev->descriptor.bcdDevice));
1010
1011         dev_dbg(dev, "Device at %p\n", udev);
1012
1013         dev_dbg(dev, "Descriptor length: %x type: %x\n",
1014                 (int)udev->descriptor.bLength,
1015                 (int)udev->descriptor.bDescriptorType);
1016
1017         netdev = alloc_etherdev(sizeof(*kaweth));
1018         if (!netdev)
1019                 return -ENOMEM;
1020
1021         kaweth = netdev_priv(netdev);
1022         kaweth->dev = udev;
1023         kaweth->net = netdev;
1024         kaweth->intf = intf;
1025
1026         spin_lock_init(&kaweth->device_lock);
1027         init_waitqueue_head(&kaweth->term_wait);
1028
1029         dev_dbg(dev, "Resetting.\n");
1030
1031         kaweth_reset(kaweth);
1032
1033         /*
1034          * If high byte of bcdDevice is nonzero, firmware is already
1035          * downloaded. Don't try to do it again, or we'll hang the device.
1036          */
1037
1038         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1039                 dev_info(dev, "Firmware present in device.\n");
1040         } else {
1041                 /* Download the firmware */
1042                 dev_info(dev, "Downloading firmware...\n");
1043                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1044                 if (!kaweth->firmware_buf) {
1045                         rv = -ENOMEM;
1046                         goto err_free_netdev;
1047                 }
1048                 if ((result = kaweth_download_firmware(kaweth,
1049                                                       "/*(DEBLOBBED)*/",
1050                                                       100,
1051                                                       2)) < 0) {
1052                         dev_err(dev, "Error downloading firmware (%d)\n",
1053                                 result);
1054                         goto err_fw;
1055                 }
1056
1057                 if ((result = kaweth_download_firmware(kaweth,
1058                                                       "/*(DEBLOBBED)*/",
1059                                                       100,
1060                                                       3)) < 0) {
1061                         dev_err(dev, "Error downloading firmware fix (%d)\n",
1062                                 result);
1063                         goto err_fw;
1064                 }
1065
1066                 if ((result = kaweth_download_firmware(kaweth,
1067                                                       "/*(DEBLOBBED)*/",
1068                                                       126,
1069                                                       2)) < 0) {
1070                         dev_err(dev, "Error downloading trigger code (%d)\n",
1071                                 result);
1072                         goto err_fw;
1073
1074                 }
1075
1076                 if ((result = kaweth_download_firmware(kaweth,
1077                                                       "/*(DEBLOBBED)*/",
1078                                                       126,
1079                                                       3)) < 0) {
1080                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1081                         goto err_fw;
1082                 }
1083
1084
1085                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1086                         dev_err(dev, "Error triggering firmware (%d)\n", result);
1087                         goto err_fw;
1088                 }
1089
1090                 /* Device will now disappear for a moment...  */
1091                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
1092 err_fw:
1093                 free_page((unsigned long)kaweth->firmware_buf);
1094                 free_netdev(netdev);
1095                 return -EIO;
1096         }
1097
1098         result = kaweth_read_configuration(kaweth);
1099
1100         if(result < 0) {
1101                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1102                 goto err_free_netdev;
1103         }
1104
1105         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1106         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1107         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1108         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1109
1110         if(!memcmp(&kaweth->configuration.hw_addr,
1111                    &bcast_addr,
1112                    sizeof(bcast_addr))) {
1113                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
1114                 goto err_free_netdev;
1115         }
1116
1117         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1118                 dev_dbg(dev, "Error setting URB size\n");
1119                 goto err_free_netdev;
1120         }
1121
1122         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1123                 dev_err(dev, "Error setting SOFS wait\n");
1124                 goto err_free_netdev;
1125         }
1126
1127         result = kaweth_set_receive_filter(kaweth,
1128                                            KAWETH_PACKET_FILTER_DIRECTED |
1129                                            KAWETH_PACKET_FILTER_BROADCAST |
1130                                            KAWETH_PACKET_FILTER_MULTICAST);
1131
1132         if(result < 0) {
1133                 dev_err(dev, "Error setting receive filter\n");
1134                 goto err_free_netdev;
1135         }
1136
1137         dev_dbg(dev, "Initializing net device.\n");
1138
1139         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1140         if (!kaweth->tx_urb)
1141                 goto err_free_netdev;
1142         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1143         if (!kaweth->rx_urb)
1144                 goto err_only_tx;
1145         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1146         if (!kaweth->irq_urb)
1147                 goto err_tx_and_rx;
1148
1149         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1150                                                 INTBUFFERSIZE,
1151                                                 GFP_KERNEL,
1152                                                 &kaweth->intbufferhandle);
1153         if (!kaweth->intbuffer)
1154                 goto err_tx_and_rx_and_irq;
1155         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1156                                                 KAWETH_BUF_SIZE,
1157                                                 GFP_KERNEL,
1158                                                 &kaweth->rxbufferhandle);
1159         if (!kaweth->rx_buf)
1160                 goto err_all_but_rxbuf;
1161
1162         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1163         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1164                sizeof(kaweth->configuration.hw_addr));
1165
1166         netdev->netdev_ops = &kaweth_netdev_ops;
1167         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1168         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1169         netdev->ethtool_ops = &ops;
1170
1171         /* kaweth is zeroed as part of alloc_netdev */
1172         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1173         usb_set_intfdata(intf, kaweth);
1174
1175         SET_NETDEV_DEV(netdev, dev);
1176         if (register_netdev(netdev) != 0) {
1177                 dev_err(dev, "Error registering netdev.\n");
1178                 goto err_intfdata;
1179         }
1180
1181         dev_info(dev, "kaweth interface created at %s\n",
1182                  kaweth->net->name);
1183
1184         dev_dbg(dev, "Kaweth probe returning.\n");
1185
1186         return 0;
1187
1188 err_intfdata:
1189         usb_set_intfdata(intf, NULL);
1190         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1191 err_all_but_rxbuf:
1192         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1193 err_tx_and_rx_and_irq:
1194         usb_free_urb(kaweth->irq_urb);
1195 err_tx_and_rx:
1196         usb_free_urb(kaweth->rx_urb);
1197 err_only_tx:
1198         usb_free_urb(kaweth->tx_urb);
1199 err_free_netdev:
1200         free_netdev(netdev);
1201
1202         return rv;
1203 }
1204
1205 /****************************************************************
1206  *     kaweth_disconnect
1207  ****************************************************************/
1208 static void kaweth_disconnect(struct usb_interface *intf)
1209 {
1210         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1211         struct net_device *netdev;
1212
1213         dev_info(&intf->dev, "Unregistering\n");
1214
1215         usb_set_intfdata(intf, NULL);
1216         if (!kaweth) {
1217                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1218                 return;
1219         }
1220         netdev = kaweth->net;
1221
1222         netdev_dbg(kaweth->net, "Unregistering net device\n");
1223         unregister_netdev(netdev);
1224
1225         usb_free_urb(kaweth->rx_urb);
1226         usb_free_urb(kaweth->tx_urb);
1227         usb_free_urb(kaweth->irq_urb);
1228
1229         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1230         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1231
1232         free_netdev(netdev);
1233 }
1234
1235
1236 // FIXME this completion stuff is a modified clone of
1237 // an OLD version of some stuff in usb.c ...
1238 struct usb_api_data {
1239         wait_queue_head_t wqh;
1240         int done;
1241 };
1242
1243 /*-------------------------------------------------------------------*
1244  * completion handler for compatibility wrappers (sync control/bulk) *
1245  *-------------------------------------------------------------------*/
1246 static void usb_api_blocking_completion(struct urb *urb)
1247 {
1248         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1249
1250         awd->done=1;
1251         wake_up(&awd->wqh);
1252 }
1253
1254 /*-------------------------------------------------------------------*
1255  *                         COMPATIBILITY STUFF                       *
1256  *-------------------------------------------------------------------*/
1257
1258 // Starts urb and waits for completion or timeout
1259 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1260 {
1261         struct usb_api_data awd;
1262         int status;
1263
1264         init_waitqueue_head(&awd.wqh);
1265         awd.done = 0;
1266
1267         urb->context = &awd;
1268         status = usb_submit_urb(urb, GFP_ATOMIC);
1269         if (status) {
1270                 // something went wrong
1271                 usb_free_urb(urb);
1272                 return status;
1273         }
1274
1275         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1276                 // timeout
1277                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1278                 usb_kill_urb(urb);  // remove urb safely
1279                 status = -ETIMEDOUT;
1280         }
1281         else {
1282                 status = urb->status;
1283         }
1284
1285         if (actual_length) {
1286                 *actual_length = urb->actual_length;
1287         }
1288
1289         usb_free_urb(urb);
1290         return status;
1291 }
1292
1293 /*-------------------------------------------------------------------*/
1294 // returns status (negative) or length (positive)
1295 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1296                                        unsigned int pipe,
1297                                        struct usb_ctrlrequest *cmd, void *data,
1298                                        int len, int timeout)
1299 {
1300         struct urb *urb;
1301         int retv;
1302         int length = 0; /* shut up GCC */
1303
1304         urb = usb_alloc_urb(0, GFP_ATOMIC);
1305         if (!urb)
1306                 return -ENOMEM;
1307
1308         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1309                          len, usb_api_blocking_completion, NULL);
1310
1311         retv = usb_start_wait_urb(urb, timeout, &length);
1312         if (retv < 0) {
1313                 return retv;
1314         }
1315         else {
1316                 return length;
1317         }
1318 }
1319
1320 module_usb_driver(kaweth_driver);