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, write to the Free Software Foundation,
  29  *     Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  30  *
  31  ****************************************************************/
  32
  33 /* TODO:
  34  * Develop test procedures for USB net interfaces
  35  * Run test procedures
  36  * Fix bugs from previous two steps
  37  * Snoop other OSs for any tricks we're not doing
  38  * Reduce arbitrary timeouts
  39  * Smart multicast support
  40  * Temporary MAC change support
  41  * Tunable SOFs parameter - ioctl()?
  42  * Ethernet stats collection
  43  * Code formatting improvements
  44  */
  45
  46 #include <linux/module.h>
  47 #include <linux/slab.h>
  48 #include <linux/string.h>
  49 #include <linux/init.h>
  50 #include <linux/delay.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/etherdevice.h>
  53 #include <linux/usb.h>
  54 #include <linux/types.h>
  55 #include <linux/ethtool.h>
  56 #include <linux/dma-mapping.h>
  57 #include <linux/wait.h>
  58 #include <linux/firmware.h>
  59 #include <asm/uaccess.h>
  60 #include <asm/byteorder.h>
  61
  62 #undef DEBUG
  63
  64 #define KAWETH_MTU                      1514
  65 #define KAWETH_BUF_SIZE                 1664
  66 #define KAWETH_TX_TIMEOUT               (5 * HZ)
  67 #define KAWETH_SCRATCH_SIZE             32
  68 #define KAWETH_FIRMWARE_BUF_SIZE        4096
  69 #define KAWETH_CONTROL_TIMEOUT          (30000)
  70
  71 #define KAWETH_STATUS_BROKEN            0x0000001
  72 #define KAWETH_STATUS_CLOSING           0x0000002
  73 #define KAWETH_STATUS_SUSPENDING        0x0000004
  74
  75 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
  76
  77 #define KAWETH_PACKET_FILTER_PROMISCUOUS        0x01
  78 #define KAWETH_PACKET_FILTER_ALL_MULTICAST      0x02
  79 #define KAWETH_PACKET_FILTER_DIRECTED           0x04
  80 #define KAWETH_PACKET_FILTER_BROADCAST          0x08
  81 #define KAWETH_PACKET_FILTER_MULTICAST          0x10
  82
  83 /* Table 7 */
  84 #define KAWETH_COMMAND_GET_ETHERNET_DESC        0x00
  85 #define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
  86 #define KAWETH_COMMAND_SET_PACKET_FILTER        0x02
  87 #define KAWETH_COMMAND_STATISTICS               0x03
  88 #define KAWETH_COMMAND_SET_TEMP_MAC             0x06
  89 #define KAWETH_COMMAND_GET_TEMP_MAC             0x07
  90 #define KAWETH_COMMAND_SET_URB_SIZE             0x08
  91 #define KAWETH_COMMAND_SET_SOFS_WAIT            0x09
  92 #define KAWETH_COMMAND_SCAN                     0xFF
  93
  94 #define KAWETH_SOFS_TO_WAIT                     0x05
  95
  96 #define INTBUFFERSIZE                           4
  97
  98 #define STATE_OFFSET                            0
  99 #define STATE_MASK                              0x40
 100 #define STATE_SHIFT                             5
 101
 102 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
 103
 104
 105 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>");
 106 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
 107 MODULE_LICENSE("GPL");
 108 MODULE_FIRMWARE("kaweth/new_code.bin");
 109 MODULE_FIRMWARE("kaweth/new_code_fix.bin");
 110 MODULE_FIRMWARE("kaweth/trigger_code.bin");
 111 MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
 112
 113 static const char driver_name[] = "kaweth";
 114
 115 static int kaweth_probe(
 116                 struct usb_interface *intf,
 117                 const struct usb_device_id *id  /* from id_table */
 118         );
 119 static void kaweth_disconnect(struct usb_interface *intf);
 120 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
 121                                        unsigned int pipe,
 122                                        struct usb_ctrlrequest *cmd, void *data,
 123                                        int len, int timeout);
 124 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 125 static int kaweth_resume(struct usb_interface *intf);
 126
 127 /****************************************************************
 128  *     usb_device_id
 129  ****************************************************************/
 130 static struct usb_device_id usb_klsi_table[] = {
 131         { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 132         { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 133         { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 134         { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 135         { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 136         { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 137         { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 138         { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 139         { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 140         { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 141         { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 142         { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 143         { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 144         { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 145         { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 146         { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 147         { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 148         { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 149         { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 150         { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 151         { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 152         { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 153         { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 154         { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 155         { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 156         { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 157         { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 158         { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 159         { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
 160         { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 161         { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 162         { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 163         { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 164         { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 165         { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 166         {} /* Null terminator */
 167 };
 168
 169 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 170
 171 /****************************************************************
 172  *     kaweth_driver
 173  ****************************************************************/
 174 static struct usb_driver kaweth_driver = {
 175         .name =         driver_name,
 176         .probe =        kaweth_probe,
 177         .disconnect =   kaweth_disconnect,
 178         .suspend =      kaweth_suspend,
 179         .resume =       kaweth_resume,
 180         .id_table =     usb_klsi_table,
 181         .supports_autosuspend = 1,
 182         .disable_hub_initiated_lpm = 1,
 183 };
 184
 185 typedef __u8 eth_addr_t[6];
 186
 187 /****************************************************************
 188  *     usb_eth_dev
 189  ****************************************************************/
 190 struct usb_eth_dev {
 191         char *name;
 192         __u16 vendor;
 193         __u16 device;
 194         void *pdata;
 195 };
 196
 197 /****************************************************************
 198  *     kaweth_ethernet_configuration
 199  *     Refer Table 8
 200  ****************************************************************/
 201 struct kaweth_ethernet_configuration
 202 {
 203         __u8 size;
 204         __u8 reserved1;
 205         __u8 reserved2;
 206         eth_addr_t hw_addr;
 207         __u32 statistics_mask;
 208         __le16 segment_size;
 209         __u16 max_multicast_filters;
 210         __u8 reserved3;
 211 } __packed;
 212
 213 /****************************************************************
 214  *     kaweth_device
 215  ****************************************************************/
 216 struct kaweth_device
 217 {
 218         spinlock_t device_lock;
 219
 220         __u32 status;
 221         int end;
 222         int suspend_lowmem_rx;
 223         int suspend_lowmem_ctrl;
 224         int linkstate;
 225         int opened;
 226         struct delayed_work lowmem_work;
 227
 228         struct usb_device *dev;
 229         struct usb_interface *intf;
 230         struct net_device *net;
 231         wait_queue_head_t term_wait;
 232
 233         struct urb *rx_urb;
 234         struct urb *tx_urb;
 235         struct urb *irq_urb;
 236
 237         dma_addr_t intbufferhandle;
 238         __u8 *intbuffer;
 239         dma_addr_t rxbufferhandle;
 240         __u8 *rx_buf;
 241
 242
 243         struct sk_buff *tx_skb;
 244
 245         __u8 *firmware_buf;
 246         __u8 scratch[KAWETH_SCRATCH_SIZE];
 247         __u16 packet_filter_bitmap;
 248
 249         struct kaweth_ethernet_configuration configuration;
 250
 251         struct net_device_stats stats;
 252 };
 253
 254 /****************************************************************
 255  *     kaweth_control
 256  ****************************************************************/
 257 static int kaweth_control(struct kaweth_device *kaweth,
 258                           unsigned int pipe,
 259                           __u8 request,
 260                           __u8 requesttype,
 261                           __u16 value,
 262                           __u16 index,
 263                           void *data,
 264                           __u16 size,
 265                           int timeout)
 266 {
 267         struct usb_ctrlrequest *dr;
 268         int retval;
 269
 270         netdev_dbg(kaweth->net, "kaweth_control()\n");
 271
 272         if(in_interrupt()) {
 273                 netdev_dbg(kaweth->net, "in_interrupt()\n");
 274                 return -EBUSY;
 275         }
 276
 277         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
 278         if (!dr)
 279                 return -ENOMEM;
 280
 281         dr->bRequestType = requesttype;
 282         dr->bRequest = request;
 283         dr->wValue = cpu_to_le16(value);
 284         dr->wIndex = cpu_to_le16(index);
 285         dr->wLength = cpu_to_le16(size);
 286
 287         retval = kaweth_internal_control_msg(kaweth->dev,
 288                                              pipe,
 289                                              dr,
 290                                              data,
 291                                              size,
 292                                              timeout);
 293
 294         kfree(dr);
 295         return retval;
 296 }
 297
 298 /****************************************************************
 299  *     kaweth_read_configuration
 300  ****************************************************************/
 301 static int kaweth_read_configuration(struct kaweth_device *kaweth)
 302 {
 303         int retval;
 304
 305         netdev_dbg(kaweth->net, "Reading kaweth configuration\n");
 306
 307         retval = kaweth_control(kaweth,
 308                                 usb_rcvctrlpipe(kaweth->dev, 0),
 309                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
 310                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 311                                 0,
 312                                 0,
 313                                 (void *)&kaweth->configuration,
 314                                 sizeof(kaweth->configuration),
 315                                 KAWETH_CONTROL_TIMEOUT);
 316
 317         return retval;
 318 }
 319
 320 /****************************************************************
 321  *     kaweth_set_urb_size
 322  ****************************************************************/
 323 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 324 {
 325         int retval;
 326
 327         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
 328
 329         retval = kaweth_control(kaweth,
 330                                 usb_sndctrlpipe(kaweth->dev, 0),
 331                                 KAWETH_COMMAND_SET_URB_SIZE,
 332                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 333                                 urb_size,
 334                                 0,
 335                                 (void *)&kaweth->scratch,
 336                                 0,
 337                                 KAWETH_CONTROL_TIMEOUT);
 338
 339         return retval;
 340 }
 341
 342 /****************************************************************
 343  *     kaweth_set_sofs_wait
 344  ****************************************************************/
 345 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 346 {
 347         int retval;
 348
 349         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
 350
 351         retval = kaweth_control(kaweth,
 352                                 usb_sndctrlpipe(kaweth->dev, 0),
 353                                 KAWETH_COMMAND_SET_SOFS_WAIT,
 354                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 355                                 sofs_wait,
 356                                 0,
 357                                 (void *)&kaweth->scratch,
 358                                 0,
 359                                 KAWETH_CONTROL_TIMEOUT);
 360
 361         return retval;
 362 }
 363
 364 /****************************************************************
 365  *     kaweth_set_receive_filter
 366  ****************************************************************/
 367 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 368                                      __u16 receive_filter)
 369 {
 370         int retval;
 371
 372         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
 373                    (unsigned)receive_filter);
 374
 375         retval = kaweth_control(kaweth,
 376                                 usb_sndctrlpipe(kaweth->dev, 0),
 377                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 378                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 379                                 receive_filter,
 380                                 0,
 381                                 (void *)&kaweth->scratch,
 382                                 0,
 383                                 KAWETH_CONTROL_TIMEOUT);
 384
 385         return retval;
 386 }
 387
 388 /****************************************************************
 389  *     kaweth_download_firmware
 390  ****************************************************************/
 391 static int kaweth_download_firmware(struct kaweth_device *kaweth,
 392                                     const char *fwname,
 393                                     __u8 interrupt,
 394                                     __u8 type)
 395 {
 396         const struct firmware *fw;
 397         int data_len;
 398         int ret;
 399
 400         ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
 401         if (ret) {
 402                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
 403                 return ret;
 404         }
 405
 406         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 407                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
 408                         fw->size);
 409                 release_firmware(fw);
 410                 return -ENOSPC;
 411         }
 412         data_len = fw->size;
 413         memcpy(kaweth->firmware_buf, fw->data, fw->size);
 414
 415         release_firmware(fw);
 416
 417         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 418         kaweth->firmware_buf[3] = data_len >> 8;
 419         kaweth->firmware_buf[4] = type;
 420         kaweth->firmware_buf[5] = interrupt;
 421
 422         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
 423                    kaweth->firmware_buf[2]);
 424
 425         netdev_dbg(kaweth->net,
 426                    "Downloading firmware at %p to kaweth device at %p\n",
 427                    kaweth->firmware_buf, kaweth);
 428         netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
 429
 430         return kaweth_control(kaweth,
 431                               usb_sndctrlpipe(kaweth->dev, 0),
 432                               KAWETH_COMMAND_SCAN,
 433                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 434                               0,
 435                               0,
 436                               (void *)kaweth->firmware_buf,
 437                               data_len,
 438                               KAWETH_CONTROL_TIMEOUT);
 439 }
 440
 441 /****************************************************************
 442  *     kaweth_trigger_firmware
 443  ****************************************************************/
 444 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
 445                                    __u8 interrupt)
 446 {
 447         kaweth->firmware_buf[0] = 0xB6;
 448         kaweth->firmware_buf[1] = 0xC3;
 449         kaweth->firmware_buf[2] = 0x01;
 450         kaweth->firmware_buf[3] = 0x00;
 451         kaweth->firmware_buf[4] = 0x06;
 452         kaweth->firmware_buf[5] = interrupt;
 453         kaweth->firmware_buf[6] = 0x00;
 454         kaweth->firmware_buf[7] = 0x00;
 455
 456         netdev_dbg(kaweth->net, "Triggering firmware\n");
 457
 458         return kaweth_control(kaweth,
 459                               usb_sndctrlpipe(kaweth->dev, 0),
 460                               KAWETH_COMMAND_SCAN,
 461                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 462                               0,
 463                               0,
 464                               (void *)kaweth->firmware_buf,
 465                               8,
 466                               KAWETH_CONTROL_TIMEOUT);
 467 }
 468
 469 /****************************************************************
 470  *     kaweth_reset
 471  ****************************************************************/
 472 static int kaweth_reset(struct kaweth_device *kaweth)
 473 {
 474         int result;
 475
 476         netdev_dbg(kaweth->net, "kaweth_reset(%p)\n", kaweth);
 477         result = usb_reset_configuration(kaweth->dev);
 478         mdelay(10);
 479
 480         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
 481
 482         return result;
 483 }
 484
 485 static void kaweth_usb_receive(struct urb *);
 486 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
 487
 488 /****************************************************************
 489         int_callback
 490 *****************************************************************/
 491
 492 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
 493 {
 494         int status;
 495
 496         status = usb_submit_urb (kaweth->irq_urb, mf);
 497         if (unlikely(status == -ENOMEM)) {
 498                 kaweth->suspend_lowmem_ctrl = 1;
 499                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 500         } else {
 501                 kaweth->suspend_lowmem_ctrl = 0;
 502         }
 503
 504         if (status)
 505                 dev_err(&kaweth->intf->dev,
 506                         "can't resubmit intr, %s-%s, status %d\n",
 507                         kaweth->dev->bus->bus_name,
 508                         kaweth->dev->devpath, status);
 509 }
 510
 511 static void int_callback(struct urb *u)
 512 {
 513         struct kaweth_device *kaweth = u->context;
 514         int act_state;
 515         int status = u->status;
 516
 517         switch (status) {
 518         case 0:                 /* success */
 519                 break;
 520         case -ECONNRESET:       /* unlink */
 521         case -ENOENT:
 522         case -ESHUTDOWN:
 523                 return;
 524         /* -EPIPE:  should clear the halt */
 525         default:                /* error */
 526                 goto resubmit;
 527         }
 528
 529         /* we check the link state to report changes */
 530         if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
 531                 if (act_state)
 532                         netif_carrier_on(kaweth->net);
 533                 else
 534                         netif_carrier_off(kaweth->net);
 535
 536                 kaweth->linkstate = act_state;
 537         }
 538 resubmit:
 539         kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
 540 }
 541
 542 static void kaweth_resubmit_tl(struct work_struct *work)
 543 {
 544         struct kaweth_device *kaweth =
 545                 container_of(work, struct kaweth_device, lowmem_work.work);
 546
 547         if (IS_BLOCKED(kaweth->status))
 548                 return;
 549
 550         if (kaweth->suspend_lowmem_rx)
 551                 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 552
 553         if (kaweth->suspend_lowmem_ctrl)
 554                 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 555 }
 556
 557
 558 /****************************************************************
 559  *     kaweth_resubmit_rx_urb
 560  ****************************************************************/
 561 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
 562                                                 gfp_t mem_flags)
 563 {
 564         int result;
 565
 566         usb_fill_bulk_urb(kaweth->rx_urb,
 567                       kaweth->dev,
 568                       usb_rcvbulkpipe(kaweth->dev, 1),
 569                       kaweth->rx_buf,
 570                       KAWETH_BUF_SIZE,
 571                       kaweth_usb_receive,
 572                       kaweth);
 573         kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 574         kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
 575
 576         if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
 577                 if (result == -ENOMEM) {
 578                         kaweth->suspend_lowmem_rx = 1;
 579                         schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 580                 }
 581                 dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
 582                         result);
 583         } else {
 584                 kaweth->suspend_lowmem_rx = 0;
 585         }
 586
 587         return result;
 588 }
 589
 590 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
 591
 592 /****************************************************************
 593  *     kaweth_usb_receive
 594  ****************************************************************/
 595 static void kaweth_usb_receive(struct urb *urb)
 596 {
 597         struct device *dev = &urb->dev->dev;
 598         struct kaweth_device *kaweth = urb->context;
 599         struct net_device *net = kaweth->net;
 600         int status = urb->status;
 601
 602         int count = urb->actual_length;
 603         int count2 = urb->transfer_buffer_length;
 604
 605         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 606
 607         struct sk_buff *skb;
 608
 609         if (unlikely(status == -EPIPE)) {
 610                 kaweth->stats.rx_errors++;
 611                 kaweth->end = 1;
 612                 wake_up(&kaweth->term_wait);
 613                 dev_dbg(dev, "Status was -EPIPE.\n");
 614                 return;
 615         }
 616         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 617                 /* we are killed - set a flag and wake the disconnect handler */
 618                 kaweth->end = 1;
 619                 wake_up(&kaweth->term_wait);
 620                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
 621                 return;
 622         }
 623         if (unlikely(status == -EPROTO || status == -ETIME ||
 624                      status == -EILSEQ)) {
 625                 kaweth->stats.rx_errors++;
 626                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
 627                 return;
 628         }
 629         if (unlikely(status == -EOVERFLOW)) {
 630                 kaweth->stats.rx_errors++;
 631                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
 632         }
 633         spin_lock(&kaweth->device_lock);
 634         if (IS_BLOCKED(kaweth->status)) {
 635                 spin_unlock(&kaweth->device_lock);
 636                 return;
 637         }
 638         spin_unlock(&kaweth->device_lock);
 639
 640         if(status && status != -EREMOTEIO && count != 1) {
 641                 dev_err(&kaweth->intf->dev,
 642                         "%s RX status: %d count: %d packet_len: %d\n",
 643                         net->name, status, count, (int)pkt_len);
 644                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 645                 return;
 646         }
 647
 648         if(kaweth->net && (count > 2)) {
 649                 if(pkt_len > (count - 2)) {
 650                         dev_err(&kaweth->intf->dev,
 651                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
 652                                 pkt_len, count);
 653                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
 654                                 pkt_len & 2047);
 655                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
 656                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 657                         return;
 658                 }
 659
 660                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
 661                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 662                         return;
 663                 }
 664
 665                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 666
 667                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 668
 669                 skb_put(skb, pkt_len);
 670
 671                 skb->protocol = eth_type_trans(skb, net);
 672
 673                 netif_rx(skb);
 674
 675                 kaweth->stats.rx_packets++;
 676                 kaweth->stats.rx_bytes += pkt_len;
 677         }
 678
 679         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 680 }
 681
 682 /****************************************************************
 683  *     kaweth_open
 684  ****************************************************************/
 685 static int kaweth_open(struct net_device *net)
 686 {
 687         struct kaweth_device *kaweth = netdev_priv(net);
 688         int res;
 689
 690         netdev_dbg(kaweth->net, "Opening network device.\n");
 691
 692         res = usb_autopm_get_interface(kaweth->intf);
 693         if (res) {
 694                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
 695                 return -EIO;
 696         }
 697         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 698         if (res)
 699                 goto err_out;
 700
 701         usb_fill_int_urb(
 702                 kaweth->irq_urb,
 703                 kaweth->dev,
 704                 usb_rcvintpipe(kaweth->dev, 3),
 705                 kaweth->intbuffer,
 706                 INTBUFFERSIZE,
 707                 int_callback,
 708                 kaweth,
 709                 250); /* overriding the descriptor */
 710         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 711         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 712
 713         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 714         if (res) {
 715                 usb_kill_urb(kaweth->rx_urb);
 716                 goto err_out;
 717         }
 718         kaweth->opened = 1;
 719
 720         netif_start_queue(net);
 721
 722         kaweth_async_set_rx_mode(kaweth);
 723         return 0;
 724
 725 err_out:
 726         usb_autopm_put_interface(kaweth->intf);
 727         return -EIO;
 728 }
 729
 730 /****************************************************************
 731  *     kaweth_kill_urbs
 732  ****************************************************************/
 733 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 734 {
 735         usb_kill_urb(kaweth->irq_urb);
 736         usb_kill_urb(kaweth->rx_urb);
 737         usb_kill_urb(kaweth->tx_urb);
 738
 739         cancel_delayed_work_sync(&kaweth->lowmem_work);
 740
 741         /* a scheduled work may have resubmitted,
 742            we hit them again */
 743         usb_kill_urb(kaweth->irq_urb);
 744         usb_kill_urb(kaweth->rx_urb);
 745 }
 746
 747 /****************************************************************
 748  *     kaweth_close
 749  ****************************************************************/
 750 static int kaweth_close(struct net_device *net)
 751 {
 752         struct kaweth_device *kaweth = netdev_priv(net);
 753
 754         netif_stop_queue(net);
 755         kaweth->opened = 0;
 756
 757         kaweth->status |= KAWETH_STATUS_CLOSING;
 758
 759         kaweth_kill_urbs(kaweth);
 760
 761         kaweth->status &= ~KAWETH_STATUS_CLOSING;
 762
 763         usb_autopm_put_interface(kaweth->intf);
 764
 765         return 0;
 766 }
 767
 768 static u32 kaweth_get_link(struct net_device *dev)
 769 {
 770         struct kaweth_device *kaweth = netdev_priv(dev);
 771
 772         return kaweth->linkstate;
 773 }
 774
 775 static const struct ethtool_ops ops = {
 776         .get_link       = kaweth_get_link
 777 };
 778
 779 /****************************************************************
 780  *     kaweth_usb_transmit_complete
 781  ****************************************************************/
 782 static void kaweth_usb_transmit_complete(struct urb *urb)
 783 {
 784         struct kaweth_device *kaweth = urb->context;
 785         struct sk_buff *skb = kaweth->tx_skb;
 786         int status = urb->status;
 787
 788         if (unlikely(status != 0))
 789                 if (status != -ENOENT)
 790                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
 791                                 kaweth->net->name, status);
 792
 793         netif_wake_queue(kaweth->net);
 794         dev_kfree_skb_irq(skb);
 795 }
 796
 797 /****************************************************************
 798  *     kaweth_start_xmit
 799  ****************************************************************/
 800 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 801                                            struct net_device *net)
 802 {
 803         struct kaweth_device *kaweth = netdev_priv(net);
 804         __le16 *private_header;
 805
 806         int res;
 807
 808         spin_lock_irq(&kaweth->device_lock);
 809
 810         kaweth_async_set_rx_mode(kaweth);
 811         netif_stop_queue(net);
 812         if (IS_BLOCKED(kaweth->status)) {
 813                 goto skip;
 814         }
 815
 816         /* We now decide whether we can put our special header into the sk_buff */
 817         if (skb_cloned(skb) || skb_headroom(skb) < 2) {
 818                 /* no such luck - we make our own */
 819                 struct sk_buff *copied_skb;
 820                 copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
 821                 dev_kfree_skb_irq(skb);
 822                 skb = copied_skb;
 823                 if (!copied_skb) {
 824                         kaweth->stats.tx_errors++;
 825                         netif_start_queue(net);
 826                         spin_unlock_irq(&kaweth->device_lock);
 827                         return NETDEV_TX_OK;
 828                 }
 829         }
 830
 831         private_header = (__le16 *)__skb_push(skb, 2);
 832         *private_header = cpu_to_le16(skb->len-2);
 833         kaweth->tx_skb = skb;
 834
 835         usb_fill_bulk_urb(kaweth->tx_urb,
 836                       kaweth->dev,
 837                       usb_sndbulkpipe(kaweth->dev, 2),
 838                       private_header,
 839                       skb->len,
 840                       kaweth_usb_transmit_complete,
 841                       kaweth);
 842         kaweth->end = 0;
 843
 844         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 845         {
 846                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 847 skip:
 848                 kaweth->stats.tx_errors++;
 849
 850                 netif_start_queue(net);
 851                 dev_kfree_skb_irq(skb);
 852         }
 853         else
 854         {
 855                 kaweth->stats.tx_packets++;
 856                 kaweth->stats.tx_bytes += skb->len;
 857         }
 858
 859         spin_unlock_irq(&kaweth->device_lock);
 860
 861         return NETDEV_TX_OK;
 862 }
 863
 864 /****************************************************************
 865  *     kaweth_set_rx_mode
 866  ****************************************************************/
 867 static void kaweth_set_rx_mode(struct net_device *net)
 868 {
 869         struct kaweth_device *kaweth = netdev_priv(net);
 870
 871         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 872                                      KAWETH_PACKET_FILTER_BROADCAST |
 873                                      KAWETH_PACKET_FILTER_MULTICAST;
 874
 875         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
 876
 877         netif_stop_queue(net);
 878
 879         if (net->flags & IFF_PROMISC) {
 880                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 881         }
 882         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 883                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 884         }
 885
 886         kaweth->packet_filter_bitmap = packet_filter_bitmap;
 887         netif_wake_queue(net);
 888 }
 889
 890 /****************************************************************
 891  *     kaweth_async_set_rx_mode
 892  ****************************************************************/
 893 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 894 {
 895         int result;
 896         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 897
 898         kaweth->packet_filter_bitmap = 0;
 899         if (packet_filter_bitmap == 0)
 900                 return;
 901
 902         if (in_interrupt())
 903                 return;
 904
 905         result = kaweth_control(kaweth,
 906                                 usb_sndctrlpipe(kaweth->dev, 0),
 907                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 908                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 909                                 packet_filter_bitmap,
 910                                 0,
 911                                 (void *)&kaweth->scratch,
 912                                 0,
 913                                 KAWETH_CONTROL_TIMEOUT);
 914
 915         if(result < 0) {
 916                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
 917                         result);
 918         }
 919         else {
 920                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
 921                            packet_filter_bitmap);
 922         }
 923 }
 924
 925 /****************************************************************
 926  *     kaweth_netdev_stats
 927  ****************************************************************/
 928 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
 929 {
 930         struct kaweth_device *kaweth = netdev_priv(dev);
 931         return &kaweth->stats;
 932 }
 933
 934 /****************************************************************
 935  *     kaweth_tx_timeout
 936  ****************************************************************/
 937 static void kaweth_tx_timeout(struct net_device *net)
 938 {
 939         struct kaweth_device *kaweth = netdev_priv(net);
 940
 941         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 942         kaweth->stats.tx_errors++;
 943         net->trans_start = jiffies;
 944
 945         usb_unlink_urb(kaweth->tx_urb);
 946 }
 947
 948 /****************************************************************
 949  *     kaweth_suspend
 950  ****************************************************************/
 951 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 952 {
 953         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 954         unsigned long flags;
 955
 956         dev_dbg(&intf->dev, "Suspending device\n");
 957         spin_lock_irqsave(&kaweth->device_lock, flags);
 958         kaweth->status |= KAWETH_STATUS_SUSPENDING;
 959         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 960
 961         kaweth_kill_urbs(kaweth);
 962         return 0;
 963 }
 964
 965 /****************************************************************
 966  *     kaweth_resume
 967  ****************************************************************/
 968 static int kaweth_resume(struct usb_interface *intf)
 969 {
 970         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 971         unsigned long flags;
 972
 973         dev_dbg(&intf->dev, "Resuming device\n");
 974         spin_lock_irqsave(&kaweth->device_lock, flags);
 975         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 976         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 977
 978         if (!kaweth->opened)
 979                 return 0;
 980         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 981         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 982
 983         return 0;
 984 }
 985
 986 /****************************************************************
 987  *     kaweth_probe
 988  ****************************************************************/
 989
 990
 991 static const struct net_device_ops kaweth_netdev_ops = {
 992         .ndo_open =                     kaweth_open,
 993         .ndo_stop =                     kaweth_close,
 994         .ndo_start_xmit =               kaweth_start_xmit,
 995         .ndo_tx_timeout =               kaweth_tx_timeout,
 996         .ndo_set_rx_mode =              kaweth_set_rx_mode,
 997         .ndo_get_stats =                kaweth_netdev_stats,
 998         .ndo_change_mtu =               eth_change_mtu,
 999         .ndo_set_mac_address =          eth_mac_addr,
1000         .ndo_validate_addr =            eth_validate_addr,
1001 };
1002
1003 static int kaweth_probe(
1004                 struct usb_interface *intf,
1005                 const struct usb_device_id *id      /* from id_table */
1006         )
1007 {
1008         struct device *dev = &intf->dev;
1009         struct usb_device *udev = interface_to_usbdev(intf);
1010         struct kaweth_device *kaweth;
1011         struct net_device *netdev;
1012         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1013         int result = 0;
1014
1015         dev_dbg(dev,
1016                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1017                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1018                 le16_to_cpu(udev->descriptor.idProduct),
1019                 le16_to_cpu(udev->descriptor.bcdDevice));
1020
1021         dev_dbg(dev, "Device at %p\n", udev);
1022
1023         dev_dbg(dev, "Descriptor length: %x type: %x\n",
1024                 (int)udev->descriptor.bLength,
1025                 (int)udev->descriptor.bDescriptorType);
1026
1027         netdev = alloc_etherdev(sizeof(*kaweth));
1028         if (!netdev)
1029                 return -ENOMEM;
1030
1031         kaweth = netdev_priv(netdev);
1032         kaweth->dev = udev;
1033         kaweth->net = netdev;
1034
1035         spin_lock_init(&kaweth->device_lock);
1036         init_waitqueue_head(&kaweth->term_wait);
1037
1038         dev_dbg(dev, "Resetting.\n");
1039
1040         kaweth_reset(kaweth);
1041
1042         /*
1043          * If high byte of bcdDevice is nonzero, firmware is already
1044          * downloaded. Don't try to do it again, or we'll hang the device.
1045          */
1046
1047         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1048                 dev_info(dev, "Firmware present in device.\n");
1049         } else {
1050                 /* Download the firmware */
1051                 dev_info(dev, "Downloading firmware...\n");
1052                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1053                 if ((result = kaweth_download_firmware(kaweth,
1054                                                       "kaweth/new_code.bin",
1055                                                       100,
1056                                                       2)) < 0) {
1057                         dev_err(dev, "Error downloading firmware (%d)\n",
1058                                 result);
1059                         goto err_fw;
1060                 }
1061
1062                 if ((result = kaweth_download_firmware(kaweth,
1063                                                       "kaweth/new_code_fix.bin",
1064                                                       100,
1065                                                       3)) < 0) {
1066                         dev_err(dev, "Error downloading firmware fix (%d)\n",
1067                                 result);
1068                         goto err_fw;
1069                 }
1070
1071                 if ((result = kaweth_download_firmware(kaweth,
1072                                                       "kaweth/trigger_code.bin",
1073                                                       126,
1074                                                       2)) < 0) {
1075                         dev_err(dev, "Error downloading trigger code (%d)\n",
1076                                 result);
1077                         goto err_fw;
1078
1079                 }
1080
1081                 if ((result = kaweth_download_firmware(kaweth,
1082                                                       "kaweth/trigger_code_fix.bin",
1083                                                       126,
1084                                                       3)) < 0) {
1085                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1086                         goto err_fw;
1087                 }
1088
1089
1090                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1091                         dev_err(dev, "Error triggering firmware (%d)\n", result);
1092                         goto err_fw;
1093                 }
1094
1095                 /* Device will now disappear for a moment...  */
1096                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
1097 err_fw:
1098                 free_page((unsigned long)kaweth->firmware_buf);
1099                 free_netdev(netdev);
1100                 return -EIO;
1101         }
1102
1103         result = kaweth_read_configuration(kaweth);
1104
1105         if(result < 0) {
1106                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1107                 goto err_free_netdev;
1108         }
1109
1110         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1111         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1112         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1113         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1114
1115         if(!memcmp(&kaweth->configuration.hw_addr,
1116                    &bcast_addr,
1117                    sizeof(bcast_addr))) {
1118                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
1119                 goto err_free_netdev;
1120         }
1121
1122         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1123                 dev_dbg(dev, "Error setting URB size\n");
1124                 goto err_free_netdev;
1125         }
1126
1127         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1128                 dev_err(dev, "Error setting SOFS wait\n");
1129                 goto err_free_netdev;
1130         }
1131
1132         result = kaweth_set_receive_filter(kaweth,
1133                                            KAWETH_PACKET_FILTER_DIRECTED |
1134                                            KAWETH_PACKET_FILTER_BROADCAST |
1135                                            KAWETH_PACKET_FILTER_MULTICAST);
1136
1137         if(result < 0) {
1138                 dev_err(dev, "Error setting receive filter\n");
1139                 goto err_free_netdev;
1140         }
1141
1142         dev_dbg(dev, "Initializing net device.\n");
1143
1144         kaweth->intf = intf;
1145
1146         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1147         if (!kaweth->tx_urb)
1148                 goto err_free_netdev;
1149         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1150         if (!kaweth->rx_urb)
1151                 goto err_only_tx;
1152         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1153         if (!kaweth->irq_urb)
1154                 goto err_tx_and_rx;
1155
1156         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1157                                                 INTBUFFERSIZE,
1158                                                 GFP_KERNEL,
1159                                                 &kaweth->intbufferhandle);
1160         if (!kaweth->intbuffer)
1161                 goto err_tx_and_rx_and_irq;
1162         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1163                                                 KAWETH_BUF_SIZE,
1164                                                 GFP_KERNEL,
1165                                                 &kaweth->rxbufferhandle);
1166         if (!kaweth->rx_buf)
1167                 goto err_all_but_rxbuf;
1168
1169         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1170         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1171                sizeof(kaweth->configuration.hw_addr));
1172
1173         netdev->netdev_ops = &kaweth_netdev_ops;
1174         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1175         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1176         SET_ETHTOOL_OPS(netdev, &ops);
1177
1178         /* kaweth is zeroed as part of alloc_netdev */
1179         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1180         usb_set_intfdata(intf, kaweth);
1181
1182 #if 0
1183 // dma_supported() is deeply broken on almost all architectures
1184         if (dma_supported (dev, 0xffffffffffffffffULL))
1185                 kaweth->net->features |= NETIF_F_HIGHDMA;
1186 #endif
1187
1188         SET_NETDEV_DEV(netdev, dev);
1189         if (register_netdev(netdev) != 0) {
1190                 dev_err(dev, "Error registering netdev.\n");
1191                 goto err_intfdata;
1192         }
1193
1194         dev_info(dev, "kaweth interface created at %s\n",
1195                  kaweth->net->name);
1196
1197         dev_dbg(dev, "Kaweth probe returning.\n");
1198
1199         return 0;
1200
1201 err_intfdata:
1202         usb_set_intfdata(intf, NULL);
1203         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1204 err_all_but_rxbuf:
1205         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1206 err_tx_and_rx_and_irq:
1207         usb_free_urb(kaweth->irq_urb);
1208 err_tx_and_rx:
1209         usb_free_urb(kaweth->rx_urb);
1210 err_only_tx:
1211         usb_free_urb(kaweth->tx_urb);
1212 err_free_netdev:
1213         free_netdev(netdev);
1214
1215         return -EIO;
1216 }
1217
1218 /****************************************************************
1219  *     kaweth_disconnect
1220  ****************************************************************/
1221 static void kaweth_disconnect(struct usb_interface *intf)
1222 {
1223         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1224         struct net_device *netdev;
1225
1226         dev_info(&intf->dev, "Unregistering\n");
1227
1228         usb_set_intfdata(intf, NULL);
1229         if (!kaweth) {
1230                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1231                 return;
1232         }
1233         netdev = kaweth->net;
1234
1235         netdev_dbg(kaweth->net, "Unregistering net device\n");
1236         unregister_netdev(netdev);
1237
1238         usb_free_urb(kaweth->rx_urb);
1239         usb_free_urb(kaweth->tx_urb);
1240         usb_free_urb(kaweth->irq_urb);
1241
1242         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1243         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1244
1245         free_netdev(netdev);
1246 }
1247
1248
1249 // FIXME this completion stuff is a modified clone of
1250 // an OLD version of some stuff in usb.c ...
1251 struct usb_api_data {
1252         wait_queue_head_t wqh;
1253         int done;
1254 };
1255
1256 /*-------------------------------------------------------------------*
1257  * completion handler for compatibility wrappers (sync control/bulk) *
1258  *-------------------------------------------------------------------*/
1259 static void usb_api_blocking_completion(struct urb *urb)
1260 {
1261         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1262
1263         awd->done=1;
1264         wake_up(&awd->wqh);
1265 }
1266
1267 /*-------------------------------------------------------------------*
1268  *                         COMPATIBILITY STUFF                       *
1269  *-------------------------------------------------------------------*/
1270
1271 // Starts urb and waits for completion or timeout
1272 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1273 {
1274         struct usb_api_data awd;
1275         int status;
1276
1277         init_waitqueue_head(&awd.wqh);
1278         awd.done = 0;
1279
1280         urb->context = &awd;
1281         status = usb_submit_urb(urb, GFP_NOIO);
1282         if (status) {
1283                 // something went wrong
1284                 usb_free_urb(urb);
1285                 return status;
1286         }
1287
1288         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1289                 // timeout
1290                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1291                 usb_kill_urb(urb);  // remove urb safely
1292                 status = -ETIMEDOUT;
1293         }
1294         else {
1295                 status = urb->status;
1296         }
1297
1298         if (actual_length) {
1299                 *actual_length = urb->actual_length;
1300         }
1301
1302         usb_free_urb(urb);
1303         return status;
1304 }
1305
1306 /*-------------------------------------------------------------------*/
1307 // returns status (negative) or length (positive)
1308 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1309                                        unsigned int pipe,
1310                                        struct usb_ctrlrequest *cmd, void *data,
1311                                        int len, int timeout)
1312 {
1313         struct urb *urb;
1314         int retv;
1315         int length = 0; /* shut up GCC */
1316
1317         urb = usb_alloc_urb(0, GFP_ATOMIC);
1318         if (!urb)
1319                 return -ENOMEM;
1320
1321         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1322                          len, usb_api_blocking_completion, NULL);
1323
1324         retv = usb_start_wait_urb(urb, timeout, &length);
1325         if (retv < 0) {
1326                 return retv;
1327         }
1328         else {
1329                 return length;
1330         }
1331 }
1332
1333 module_usb_driver(kaweth_driver);