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