drivers/net/usb/kaweth.c

   1 /****************************************************************
   2  *
   3  *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
   4  *
   5  *     (c) 2000 Interlan Communications
   6  *     (c) 2000 Stephane Alnet
   7  *     (C) 2001 Brad Hards
   8  *     (C) 2002 Oliver Neukum
   9  *
  10  *     Original author: The Zapman <zapman@interlan.net>
  11  *     Inspired by, and much credit goes to Michael Rothwell
  12  *     <rothwell@interlan.net> for the test equipment, help, and patience
  13  *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
  14  *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
  15  *     for providing the firmware and driver resources.
  16  *
  17  *     This program is free software; you can redistribute it and/or
  18  *     modify it under the terms of the GNU General Public License as
  19  *     published by the Free Software Foundation; either version 2, or
  20  *     (at your option) any later version.
  21  *
  22  *     This program is distributed in the hope that it will be useful,
  23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *     GNU General Public License for more details.
  26  *
  27  *     You should have received a copy of the GNU General Public License
  28  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  29  *
  30  ****************************************************************/
  31
  32 /* TODO:
  33  * Develop test procedures for USB net interfaces
  34  * Run test procedures
  35  * Fix bugs from previous two steps
  36  * Snoop other OSs for any tricks we're not doing
  37  * Reduce arbitrary timeouts
  38  * Smart multicast support
  39  * Temporary MAC change support
  40  * Tunable SOFs parameter - ioctl()?
  41  * Ethernet stats collection
  42  * Code formatting improvements
  43  */
  44
  45 #include <linux/module.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/delay.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/usb.h>
  52 #include <linux/types.h>
  53 #include <linux/ethtool.h>
  54 #include <linux/dma-mapping.h>
  55 #include <linux/wait.h>
  56 #include <linux/firmware.h>
  57 #include <asm/uaccess.h>
  58 #include <asm/byteorder.h>
  59
  60 #undef DEBUG
  61
  62 #define KAWETH_MTU                      1514
  63 #define KAWETH_BUF_SIZE                 1664
  64 #define KAWETH_TX_TIMEOUT               (5 * HZ)
  65 #define KAWETH_SCRATCH_SIZE             32
  66 #define KAWETH_FIRMWARE_BUF_SIZE        4096
  67 #define KAWETH_CONTROL_TIMEOUT          (30000)
  68
  69 #define KAWETH_STATUS_BROKEN            0x0000001
  70 #define KAWETH_STATUS_CLOSING           0x0000002
  71 #define KAWETH_STATUS_SUSPENDING        0x0000004
  72
  73 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
  74
  75 #define KAWETH_PACKET_FILTER_PROMISCUOUS        0x01
  76 #define KAWETH_PACKET_FILTER_ALL_MULTICAST      0x02
  77 #define KAWETH_PACKET_FILTER_DIRECTED           0x04
  78 #define KAWETH_PACKET_FILTER_BROADCAST          0x08
  79 #define KAWETH_PACKET_FILTER_MULTICAST          0x10
  80
  81 /* Table 7 */
  82 #define KAWETH_COMMAND_GET_ETHERNET_DESC        0x00
  83 #define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
  84 #define KAWETH_COMMAND_SET_PACKET_FILTER        0x02
  85 #define KAWETH_COMMAND_STATISTICS               0x03
  86 #define KAWETH_COMMAND_SET_TEMP_MAC             0x06
  87 #define KAWETH_COMMAND_GET_TEMP_MAC             0x07
  88 #define KAWETH_COMMAND_SET_URB_SIZE             0x08
  89 #define KAWETH_COMMAND_SET_SOFS_WAIT            0x09
  90 #define KAWETH_COMMAND_SCAN                     0xFF
  91
  92 #define KAWETH_SOFS_TO_WAIT                     0x05
  93
  94 #define INTBUFFERSIZE                           4
  95
  96 #define STATE_OFFSET                            0
  97 #define STATE_MASK                              0x40
  98 #define STATE_SHIFT                             5
  99
 100 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
 101
 102
 103 MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
 104 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
 105 MODULE_LICENSE("GPL");
 106 MODULE_FIRMWARE("kaweth/new_code.bin");
 107 MODULE_FIRMWARE("kaweth/new_code_fix.bin");
 108 MODULE_FIRMWARE("kaweth/trigger_code.bin");
 109 MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
 110
 111 static const char driver_name[] = "kaweth";
 112
 113 static int kaweth_probe(
 114                 struct usb_interface *intf,
 115                 const struct usb_device_id *id  /* from id_table */
 116         );
 117 static void kaweth_disconnect(struct usb_interface *intf);
 118 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
 119                                        unsigned int pipe,
 120                                        struct usb_ctrlrequest *cmd, void *data,
 121                                        int len, int timeout);
 122 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 123 static int kaweth_resume(struct usb_interface *intf);
 124
 125 /****************************************************************
 126  *     usb_device_id
 127  ****************************************************************/
 128 static struct usb_device_id usb_klsi_table[] = {
 129         { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 130         { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 131         { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 132         { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 133         { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 134         { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 135         { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 136         { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 137         { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 138         { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 139         { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 140         { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 141         { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 142         { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 143         { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 144         { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 145         { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 146         { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 147         { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 148         { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 149         { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 150         { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 151         { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 152         { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 153         { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 154         { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 155         { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 156         { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 157         { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
 158         { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 159         { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 160         { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 161         { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 162         { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 163         { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 164         {} /* Null terminator */
 165 };
 166
 167 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 168
 169 /****************************************************************
 170  *     kaweth_driver
 171  ****************************************************************/
 172 static struct usb_driver kaweth_driver = {
 173         .name =         driver_name,
 174         .probe =        kaweth_probe,
 175         .disconnect =   kaweth_disconnect,
 176         .suspend =      kaweth_suspend,
 177         .resume =       kaweth_resume,
 178         .id_table =     usb_klsi_table,
 179         .supports_autosuspend = 1,
 180         .disable_hub_initiated_lpm = 1,
 181 };
 182
 183 typedef __u8 eth_addr_t[6];
 184
 185 /****************************************************************
 186  *     usb_eth_dev
 187  ****************************************************************/
 188 struct usb_eth_dev {
 189         char *name;
 190         __u16 vendor;
 191         __u16 device;
 192         void *pdata;
 193 };
 194
 195 /****************************************************************
 196  *     kaweth_ethernet_configuration
 197  *     Refer Table 8
 198  ****************************************************************/
 199 struct kaweth_ethernet_configuration
 200 {
 201         __u8 size;
 202         __u8 reserved1;
 203         __u8 reserved2;
 204         eth_addr_t hw_addr;
 205         __u32 statistics_mask;
 206         __le16 segment_size;
 207         __u16 max_multicast_filters;
 208         __u8 reserved3;
 209 } __packed;
 210
 211 /****************************************************************
 212  *     kaweth_device
 213  ****************************************************************/
 214 struct kaweth_device
 215 {
 216         spinlock_t device_lock;
 217
 218         __u32 status;
 219         int end;
 220         int suspend_lowmem_rx;
 221         int suspend_lowmem_ctrl;
 222         int linkstate;
 223         int opened;
 224         struct delayed_work lowmem_work;
 225
 226         struct usb_device *dev;
 227         struct usb_interface *intf;
 228         struct net_device *net;
 229         wait_queue_head_t term_wait;
 230
 231         struct urb *rx_urb;
 232         struct urb *tx_urb;
 233         struct urb *irq_urb;
 234
 235         dma_addr_t intbufferhandle;
 236         __u8 *intbuffer;
 237         dma_addr_t rxbufferhandle;
 238         __u8 *rx_buf;
 239
 240
 241         struct sk_buff *tx_skb;
 242
 243         __u8 *firmware_buf;
 244         __u8 scratch[KAWETH_SCRATCH_SIZE];
 245         __u16 packet_filter_bitmap;
 246
 247         struct kaweth_ethernet_configuration configuration;
 248
 249         struct net_device_stats stats;
 250 };
 251
 252 /****************************************************************
 253  *     kaweth_control
 254  ****************************************************************/
 255 static int kaweth_control(struct kaweth_device *kaweth,
 256                           unsigned int pipe,
 257                           __u8 request,
 258                           __u8 requesttype,
 259                           __u16 value,
 260                           __u16 index,
 261                           void *data,
 262                           __u16 size,
 263                           int timeout)
 264 {
 265         struct usb_ctrlrequest *dr;
 266         int retval;
 267
 268         netdev_dbg(kaweth->net, "kaweth_control()\n");
 269
 270         if(in_interrupt()) {
 271                 netdev_dbg(kaweth->net, "in_interrupt()\n");
 272                 return -EBUSY;
 273         }
 274
 275         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
 276         if (!dr)
 277                 return -ENOMEM;
 278
 279         dr->bRequestType = requesttype;
 280         dr->bRequest = request;
 281         dr->wValue = cpu_to_le16(value);
 282         dr->wIndex = cpu_to_le16(index);
 283         dr->wLength = cpu_to_le16(size);
 284
 285         retval = kaweth_internal_control_msg(kaweth->dev,
 286                                              pipe,
 287                                              dr,
 288                                              data,
 289                                              size,
 290                                              timeout);
 291
 292         kfree(dr);
 293         return retval;
 294 }
 295
 296 /****************************************************************
 297  *     kaweth_read_configuration
 298  ****************************************************************/
 299 static int kaweth_read_configuration(struct kaweth_device *kaweth)
 300 {
 301         int retval;
 302
 303         netdev_dbg(kaweth->net, "Reading kaweth configuration\n");
 304
 305         retval = kaweth_control(kaweth,
 306                                 usb_rcvctrlpipe(kaweth->dev, 0),
 307                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
 308                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 309                                 0,
 310                                 0,
 311                                 (void *)&kaweth->configuration,
 312                                 sizeof(kaweth->configuration),
 313                                 KAWETH_CONTROL_TIMEOUT);
 314
 315         return retval;
 316 }
 317
 318 /****************************************************************
 319  *     kaweth_set_urb_size
 320  ****************************************************************/
 321 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 322 {
 323         int retval;
 324
 325         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
 326
 327         retval = kaweth_control(kaweth,
 328                                 usb_sndctrlpipe(kaweth->dev, 0),
 329                                 KAWETH_COMMAND_SET_URB_SIZE,
 330                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 331                                 urb_size,
 332                                 0,
 333                                 (void *)&kaweth->scratch,
 334                                 0,
 335                                 KAWETH_CONTROL_TIMEOUT);
 336
 337         return retval;
 338 }
 339
 340 /****************************************************************
 341  *     kaweth_set_sofs_wait
 342  ****************************************************************/
 343 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 344 {
 345         int retval;
 346
 347         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
 348
 349         retval = kaweth_control(kaweth,
 350                                 usb_sndctrlpipe(kaweth->dev, 0),
 351                                 KAWETH_COMMAND_SET_SOFS_WAIT,
 352                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 353                                 sofs_wait,
 354                                 0,
 355                                 (void *)&kaweth->scratch,
 356                                 0,
 357                                 KAWETH_CONTROL_TIMEOUT);
 358
 359         return retval;
 360 }
 361
 362 /****************************************************************
 363  *     kaweth_set_receive_filter
 364  ****************************************************************/
 365 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 366                                      __u16 receive_filter)
 367 {
 368         int retval;
 369
 370         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
 371                    (unsigned)receive_filter);
 372
 373         retval = kaweth_control(kaweth,
 374                                 usb_sndctrlpipe(kaweth->dev, 0),
 375                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 376                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 377                                 receive_filter,
 378                                 0,
 379                                 (void *)&kaweth->scratch,
 380                                 0,
 381                                 KAWETH_CONTROL_TIMEOUT);
 382
 383         return retval;
 384 }
 385
 386 /****************************************************************
 387  *     kaweth_download_firmware
 388  ****************************************************************/
 389 static int kaweth_download_firmware(struct kaweth_device *kaweth,
 390                                     const char *fwname,
 391                                     __u8 interrupt,
 392                                     __u8 type)
 393 {
 394         const struct firmware *fw;
 395         int data_len;
 396         int ret;
 397
 398         ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
 399         if (ret) {
 400                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
 401                 return ret;
 402         }
 403
 404         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 405                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
 406                         fw->size);
 407                 release_firmware(fw);
 408                 return -ENOSPC;
 409         }
 410         data_len = fw->size;
 411         memcpy(kaweth->firmware_buf, fw->data, fw->size);
 412
 413         release_firmware(fw);
 414
 415         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 416         kaweth->firmware_buf[3] = data_len >> 8;
 417         kaweth->firmware_buf[4] = type;
 418         kaweth->firmware_buf[5] = interrupt;
 419
 420         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
 421                    kaweth->firmware_buf[2]);
 422
 423         netdev_dbg(kaweth->net,
 424                    "Downloading firmware at %p to kaweth device at %p\n",
 425                    kaweth->firmware_buf, kaweth);
 426         netdev_dbg(kaweth->net, "Firmware length: %d\n", 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         netdev_dbg(kaweth->net, "Triggering firmware\n");
 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         netdev_dbg(kaweth->net, "kaweth_reset(%p)\n", kaweth);
 475         result = usb_reset_configuration(kaweth->dev);
 476         mdelay(10);
 477
 478         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", 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 device *dev = &urb->dev->dev;
 596         struct kaweth_device *kaweth = urb->context;
 597         struct net_device *net = kaweth->net;
 598         int status = urb->status;
 599
 600         int count = urb->actual_length;
 601         int count2 = urb->transfer_buffer_length;
 602
 603         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 604
 605         struct sk_buff *skb;
 606
 607         if (unlikely(status == -EPIPE)) {
 608                 kaweth->stats.rx_errors++;
 609                 kaweth->end = 1;
 610                 wake_up(&kaweth->term_wait);
 611                 dev_dbg(dev, "Status was -EPIPE.\n");
 612                 return;
 613         }
 614         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 615                 /* we are killed - set a flag and wake the disconnect handler */
 616                 kaweth->end = 1;
 617                 wake_up(&kaweth->term_wait);
 618                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
 619                 return;
 620         }
 621         if (unlikely(status == -EPROTO || status == -ETIME ||
 622                      status == -EILSEQ)) {
 623                 kaweth->stats.rx_errors++;
 624                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
 625                 return;
 626         }
 627         if (unlikely(status == -EOVERFLOW)) {
 628                 kaweth->stats.rx_errors++;
 629                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
 630         }
 631         spin_lock(&kaweth->device_lock);
 632         if (IS_BLOCKED(kaweth->status)) {
 633                 spin_unlock(&kaweth->device_lock);
 634                 return;
 635         }
 636         spin_unlock(&kaweth->device_lock);
 637
 638         if(status && status != -EREMOTEIO && count != 1) {
 639                 dev_err(&kaweth->intf->dev,
 640                         "%s RX status: %d count: %d packet_len: %d\n",
 641                         net->name, status, count, (int)pkt_len);
 642                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 643                 return;
 644         }
 645
 646         if(kaweth->net && (count > 2)) {
 647                 if(pkt_len > (count - 2)) {
 648                         dev_err(&kaweth->intf->dev,
 649                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
 650                                 pkt_len, count);
 651                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
 652                                 pkt_len & 2047);
 653                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
 654                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 655                         return;
 656                 }
 657
 658                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
 659                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 660                         return;
 661                 }
 662
 663                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 664
 665                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 666
 667                 skb_put(skb, pkt_len);
 668
 669                 skb->protocol = eth_type_trans(skb, net);
 670
 671                 netif_rx(skb);
 672
 673                 kaweth->stats.rx_packets++;
 674                 kaweth->stats.rx_bytes += pkt_len;
 675         }
 676
 677         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 678 }
 679
 680 /****************************************************************
 681  *     kaweth_open
 682  ****************************************************************/
 683 static int kaweth_open(struct net_device *net)
 684 {
 685         struct kaweth_device *kaweth = netdev_priv(net);
 686         int res;
 687
 688         netdev_dbg(kaweth->net, "Opening network device.\n");
 689
 690         res = usb_autopm_get_interface(kaweth->intf);
 691         if (res) {
 692                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
 693                 return -EIO;
 694         }
 695         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 696         if (res)
 697                 goto err_out;
 698
 699         usb_fill_int_urb(
 700                 kaweth->irq_urb,
 701                 kaweth->dev,
 702                 usb_rcvintpipe(kaweth->dev, 3),
 703                 kaweth->intbuffer,
 704                 INTBUFFERSIZE,
 705                 int_callback,
 706                 kaweth,
 707                 250); /* overriding the descriptor */
 708         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 709         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 710
 711         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 712         if (res) {
 713                 usb_kill_urb(kaweth->rx_urb);
 714                 goto err_out;
 715         }
 716         kaweth->opened = 1;
 717
 718         netif_start_queue(net);
 719
 720         kaweth_async_set_rx_mode(kaweth);
 721         return 0;
 722
 723 err_out:
 724         usb_autopm_put_interface(kaweth->intf);
 725         return -EIO;
 726 }
 727
 728 /****************************************************************
 729  *     kaweth_kill_urbs
 730  ****************************************************************/
 731 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 732 {
 733         usb_kill_urb(kaweth->irq_urb);
 734         usb_kill_urb(kaweth->rx_urb);
 735         usb_kill_urb(kaweth->tx_urb);
 736
 737         cancel_delayed_work_sync(&kaweth->lowmem_work);
 738
 739         /* a scheduled work may have resubmitted,
 740            we hit them again */
 741         usb_kill_urb(kaweth->irq_urb);
 742         usb_kill_urb(kaweth->rx_urb);
 743 }
 744
 745 /****************************************************************
 746  *     kaweth_close
 747  ****************************************************************/
 748 static int kaweth_close(struct net_device *net)
 749 {
 750         struct kaweth_device *kaweth = netdev_priv(net);
 751
 752         netif_stop_queue(net);
 753         kaweth->opened = 0;
 754
 755         kaweth->status |= KAWETH_STATUS_CLOSING;
 756
 757         kaweth_kill_urbs(kaweth);
 758
 759         kaweth->status &= ~KAWETH_STATUS_CLOSING;
 760
 761         usb_autopm_put_interface(kaweth->intf);
 762
 763         return 0;
 764 }
 765
 766 static u32 kaweth_get_link(struct net_device *dev)
 767 {
 768         struct kaweth_device *kaweth = netdev_priv(dev);
 769
 770         return kaweth->linkstate;
 771 }
 772
 773 static const struct ethtool_ops ops = {
 774         .get_link       = kaweth_get_link
 775 };
 776
 777 /****************************************************************
 778  *     kaweth_usb_transmit_complete
 779  ****************************************************************/
 780 static void kaweth_usb_transmit_complete(struct urb *urb)
 781 {
 782         struct kaweth_device *kaweth = urb->context;
 783         struct sk_buff *skb = kaweth->tx_skb;
 784         int status = urb->status;
 785
 786         if (unlikely(status != 0))
 787                 if (status != -ENOENT)
 788                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
 789                                 kaweth->net->name, status);
 790
 791         netif_wake_queue(kaweth->net);
 792         dev_kfree_skb_irq(skb);
 793 }
 794
 795 /****************************************************************
 796  *     kaweth_start_xmit
 797  ****************************************************************/
 798 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 799                                            struct net_device *net)
 800 {
 801         struct kaweth_device *kaweth = netdev_priv(net);
 802         __le16 *private_header;
 803
 804         int res;
 805
 806         spin_lock_irq(&kaweth->device_lock);
 807
 808         kaweth_async_set_rx_mode(kaweth);
 809         netif_stop_queue(net);
 810         if (IS_BLOCKED(kaweth->status)) {
 811                 goto skip;
 812         }
 813
 814         /* We now decide whether we can put our special header into the sk_buff */
 815         if (skb_cloned(skb) || skb_headroom(skb) < 2) {
 816                 /* no such luck - we make our own */
 817                 struct sk_buff *copied_skb;
 818                 copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
 819                 dev_kfree_skb_irq(skb);
 820                 skb = copied_skb;
 821                 if (!copied_skb) {
 822                         kaweth->stats.tx_errors++;
 823                         netif_start_queue(net);
 824                         spin_unlock_irq(&kaweth->device_lock);
 825                         return NETDEV_TX_OK;
 826                 }
 827         }
 828
 829         private_header = (__le16 *)__skb_push(skb, 2);
 830         *private_header = cpu_to_le16(skb->len-2);
 831         kaweth->tx_skb = skb;
 832
 833         usb_fill_bulk_urb(kaweth->tx_urb,
 834                       kaweth->dev,
 835                       usb_sndbulkpipe(kaweth->dev, 2),
 836                       private_header,
 837                       skb->len,
 838                       kaweth_usb_transmit_complete,
 839                       kaweth);
 840         kaweth->end = 0;
 841
 842         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 843         {
 844                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 845 skip:
 846                 kaweth->stats.tx_errors++;
 847
 848                 netif_start_queue(net);
 849                 dev_kfree_skb_irq(skb);
 850         }
 851         else
 852         {
 853                 kaweth->stats.tx_packets++;
 854                 kaweth->stats.tx_bytes += skb->len;
 855         }
 856
 857         spin_unlock_irq(&kaweth->device_lock);
 858
 859         return NETDEV_TX_OK;
 860 }
 861
 862 /****************************************************************
 863  *     kaweth_set_rx_mode
 864  ****************************************************************/
 865 static void kaweth_set_rx_mode(struct net_device *net)
 866 {
 867         struct kaweth_device *kaweth = netdev_priv(net);
 868
 869         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 870                                      KAWETH_PACKET_FILTER_BROADCAST |
 871                                      KAWETH_PACKET_FILTER_MULTICAST;
 872
 873         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
 874
 875         netif_stop_queue(net);
 876
 877         if (net->flags & IFF_PROMISC) {
 878                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 879         }
 880         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 881                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 882         }
 883
 884         kaweth->packet_filter_bitmap = packet_filter_bitmap;
 885         netif_wake_queue(net);
 886 }
 887
 888 /****************************************************************
 889  *     kaweth_async_set_rx_mode
 890  ****************************************************************/
 891 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 892 {
 893         int result;
 894         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 895
 896         kaweth->packet_filter_bitmap = 0;
 897         if (packet_filter_bitmap == 0)
 898                 return;
 899
 900         if (in_interrupt())
 901                 return;
 902
 903         result = kaweth_control(kaweth,
 904                                 usb_sndctrlpipe(kaweth->dev, 0),
 905                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 906                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 907                                 packet_filter_bitmap,
 908                                 0,
 909                                 (void *)&kaweth->scratch,
 910                                 0,
 911                                 KAWETH_CONTROL_TIMEOUT);
 912
 913         if(result < 0) {
 914                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
 915                         result);
 916         }
 917         else {
 918                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
 919                            packet_filter_bitmap);
 920         }
 921 }
 922
 923 /****************************************************************
 924  *     kaweth_netdev_stats
 925  ****************************************************************/
 926 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
 927 {
 928         struct kaweth_device *kaweth = netdev_priv(dev);
 929         return &kaweth->stats;
 930 }
 931
 932 /****************************************************************
 933  *     kaweth_tx_timeout
 934  ****************************************************************/
 935 static void kaweth_tx_timeout(struct net_device *net)
 936 {
 937         struct kaweth_device *kaweth = netdev_priv(net);
 938
 939         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 940         kaweth->stats.tx_errors++;
 941         net->trans_start = jiffies;
 942
 943         usb_unlink_urb(kaweth->tx_urb);
 944 }
 945
 946 /****************************************************************
 947  *     kaweth_suspend
 948  ****************************************************************/
 949 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 950 {
 951         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 952         unsigned long flags;
 953
 954         dev_dbg(&intf->dev, "Suspending device\n");
 955         spin_lock_irqsave(&kaweth->device_lock, flags);
 956         kaweth->status |= KAWETH_STATUS_SUSPENDING;
 957         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 958
 959         kaweth_kill_urbs(kaweth);
 960         return 0;
 961 }
 962
 963 /****************************************************************
 964  *     kaweth_resume
 965  ****************************************************************/
 966 static int kaweth_resume(struct usb_interface *intf)
 967 {
 968         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 969         unsigned long flags;
 970
 971         dev_dbg(&intf->dev, "Resuming device\n");
 972         spin_lock_irqsave(&kaweth->device_lock, flags);
 973         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 974         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 975
 976         if (!kaweth->opened)
 977                 return 0;
 978         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 979         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 980
 981         return 0;
 982 }
 983
 984 /****************************************************************
 985  *     kaweth_probe
 986  ****************************************************************/
 987
 988
 989 static const struct net_device_ops kaweth_netdev_ops = {
 990         .ndo_open =                     kaweth_open,
 991         .ndo_stop =                     kaweth_close,
 992         .ndo_start_xmit =               kaweth_start_xmit,
 993         .ndo_tx_timeout =               kaweth_tx_timeout,
 994         .ndo_set_rx_mode =              kaweth_set_rx_mode,
 995         .ndo_get_stats =                kaweth_netdev_stats,
 996         .ndo_change_mtu =               eth_change_mtu,
 997         .ndo_set_mac_address =          eth_mac_addr,
 998         .ndo_validate_addr =            eth_validate_addr,
 999 };
1000
1001 static int kaweth_probe(
1002                 struct usb_interface *intf,
1003                 const struct usb_device_id *id      /* from id_table */
1004         )
1005 {
1006         struct device *dev = &intf->dev;
1007         struct usb_device *udev = interface_to_usbdev(intf);
1008         struct kaweth_device *kaweth;
1009         struct net_device *netdev;
1010         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1011         int result = 0;
1012
1013         dev_dbg(dev,
1014                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1015                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1016                 le16_to_cpu(udev->descriptor.idProduct),
1017                 le16_to_cpu(udev->descriptor.bcdDevice));
1018
1019         dev_dbg(dev, "Device at %p\n", udev);
1020
1021         dev_dbg(dev, "Descriptor length: %x type: %x\n",
1022                 (int)udev->descriptor.bLength,
1023                 (int)udev->descriptor.bDescriptorType);
1024
1025         netdev = alloc_etherdev(sizeof(*kaweth));
1026         if (!netdev)
1027                 return -ENOMEM;
1028
1029         kaweth = netdev_priv(netdev);
1030         kaweth->dev = udev;
1031         kaweth->net = netdev;
1032
1033         spin_lock_init(&kaweth->device_lock);
1034         init_waitqueue_head(&kaweth->term_wait);
1035
1036         dev_dbg(dev, "Resetting.\n");
1037
1038         kaweth_reset(kaweth);
1039
1040         /*
1041          * If high byte of bcdDevice is nonzero, firmware is already
1042          * downloaded. Don't try to do it again, or we'll hang the device.
1043          */
1044
1045         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1046                 dev_info(dev, "Firmware present in device.\n");
1047         } else {
1048                 /* Download the firmware */
1049                 dev_info(dev, "Downloading firmware...\n");
1050                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1051                 if ((result = kaweth_download_firmware(kaweth,
1052                                                       "kaweth/new_code.bin",
1053                                                       100,
1054                                                       2)) < 0) {
1055                         dev_err(dev, "Error downloading firmware (%d)\n",
1056                                 result);
1057                         goto err_fw;
1058                 }
1059
1060                 if ((result = kaweth_download_firmware(kaweth,
1061                                                       "kaweth/new_code_fix.bin",
1062                                                       100,
1063                                                       3)) < 0) {
1064                         dev_err(dev, "Error downloading firmware fix (%d)\n",
1065                                 result);
1066                         goto err_fw;
1067                 }
1068
1069                 if ((result = kaweth_download_firmware(kaweth,
1070                                                       "kaweth/trigger_code.bin",
1071                                                       126,
1072                                                       2)) < 0) {
1073                         dev_err(dev, "Error downloading trigger code (%d)\n",
1074                                 result);
1075                         goto err_fw;
1076
1077                 }
1078
1079                 if ((result = kaweth_download_firmware(kaweth,
1080                                                       "kaweth/trigger_code_fix.bin",
1081                                                       126,
1082                                                       3)) < 0) {
1083                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1084                         goto err_fw;
1085                 }
1086
1087
1088                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1089                         dev_err(dev, "Error triggering firmware (%d)\n", result);
1090                         goto err_fw;
1091                 }
1092
1093                 /* Device will now disappear for a moment...  */
1094                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
1095 err_fw:
1096                 free_page((unsigned long)kaweth->firmware_buf);
1097                 free_netdev(netdev);
1098                 return -EIO;
1099         }
1100
1101         result = kaweth_read_configuration(kaweth);
1102
1103         if(result < 0) {
1104                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1105                 goto err_free_netdev;
1106         }
1107
1108         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1109         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1110         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1111         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1112
1113         if(!memcmp(&kaweth->configuration.hw_addr,
1114                    &bcast_addr,
1115                    sizeof(bcast_addr))) {
1116                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
1117                 goto err_free_netdev;
1118         }
1119
1120         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1121                 dev_dbg(dev, "Error setting URB size\n");
1122                 goto err_free_netdev;
1123         }
1124
1125         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1126                 dev_err(dev, "Error setting SOFS wait\n");
1127                 goto err_free_netdev;
1128         }
1129
1130         result = kaweth_set_receive_filter(kaweth,
1131                                            KAWETH_PACKET_FILTER_DIRECTED |
1132                                            KAWETH_PACKET_FILTER_BROADCAST |
1133                                            KAWETH_PACKET_FILTER_MULTICAST);
1134
1135         if(result < 0) {
1136                 dev_err(dev, "Error setting receive filter\n");
1137                 goto err_free_netdev;
1138         }
1139
1140         dev_dbg(dev, "Initializing net device.\n");
1141
1142         kaweth->intf = intf;
1143
1144         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1145         if (!kaweth->tx_urb)
1146                 goto err_free_netdev;
1147         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1148         if (!kaweth->rx_urb)
1149                 goto err_only_tx;
1150         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1151         if (!kaweth->irq_urb)
1152                 goto err_tx_and_rx;
1153
1154         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1155                                                 INTBUFFERSIZE,
1156                                                 GFP_KERNEL,
1157                                                 &kaweth->intbufferhandle);
1158         if (!kaweth->intbuffer)
1159                 goto err_tx_and_rx_and_irq;
1160         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1161                                                 KAWETH_BUF_SIZE,
1162                                                 GFP_KERNEL,
1163                                                 &kaweth->rxbufferhandle);
1164         if (!kaweth->rx_buf)
1165                 goto err_all_but_rxbuf;
1166
1167         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1168         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1169                sizeof(kaweth->configuration.hw_addr));
1170
1171         netdev->netdev_ops = &kaweth_netdev_ops;
1172         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1173         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1174         netdev->ethtool_ops = &ops;
1175
1176         /* kaweth is zeroed as part of alloc_netdev */
1177         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1178         usb_set_intfdata(intf, kaweth);
1179
1180 #if 0
1181 // dma_supported() is deeply broken on almost all architectures
1182         if (dma_supported (dev, 0xffffffffffffffffULL))
1183                 kaweth->net->features |= NETIF_F_HIGHDMA;
1184 #endif
1185
1186         SET_NETDEV_DEV(netdev, dev);
1187         if (register_netdev(netdev) != 0) {
1188                 dev_err(dev, "Error registering netdev.\n");
1189                 goto err_intfdata;
1190         }
1191
1192         dev_info(dev, "kaweth interface created at %s\n",
1193                  kaweth->net->name);
1194
1195         dev_dbg(dev, "Kaweth probe returning.\n");
1196
1197         return 0;
1198
1199 err_intfdata:
1200         usb_set_intfdata(intf, NULL);
1201         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1202 err_all_but_rxbuf:
1203         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1204 err_tx_and_rx_and_irq:
1205         usb_free_urb(kaweth->irq_urb);
1206 err_tx_and_rx:
1207         usb_free_urb(kaweth->rx_urb);
1208 err_only_tx:
1209         usb_free_urb(kaweth->tx_urb);
1210 err_free_netdev:
1211         free_netdev(netdev);
1212
1213         return -EIO;
1214 }
1215
1216 /****************************************************************
1217  *     kaweth_disconnect
1218  ****************************************************************/
1219 static void kaweth_disconnect(struct usb_interface *intf)
1220 {
1221         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1222         struct net_device *netdev;
1223
1224         dev_info(&intf->dev, "Unregistering\n");
1225
1226         usb_set_intfdata(intf, NULL);
1227         if (!kaweth) {
1228                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1229                 return;
1230         }
1231         netdev = kaweth->net;
1232
1233         netdev_dbg(kaweth->net, "Unregistering net device\n");
1234         unregister_netdev(netdev);
1235
1236         usb_free_urb(kaweth->rx_urb);
1237         usb_free_urb(kaweth->tx_urb);
1238         usb_free_urb(kaweth->irq_urb);
1239
1240         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1241         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1242
1243         free_netdev(netdev);
1244 }
1245
1246
1247 // FIXME this completion stuff is a modified clone of
1248 // an OLD version of some stuff in usb.c ...
1249 struct usb_api_data {
1250         wait_queue_head_t wqh;
1251         int done;
1252 };
1253
1254 /*-------------------------------------------------------------------*
1255  * completion handler for compatibility wrappers (sync control/bulk) *
1256  *-------------------------------------------------------------------*/
1257 static void usb_api_blocking_completion(struct urb *urb)
1258 {
1259         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1260
1261         awd->done=1;
1262         wake_up(&awd->wqh);
1263 }
1264
1265 /*-------------------------------------------------------------------*
1266  *                         COMPATIBILITY STUFF                       *
1267  *-------------------------------------------------------------------*/
1268
1269 // Starts urb and waits for completion or timeout
1270 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1271 {
1272         struct usb_api_data awd;
1273         int status;
1274
1275         init_waitqueue_head(&awd.wqh);
1276         awd.done = 0;
1277
1278         urb->context = &awd;
1279         status = usb_submit_urb(urb, GFP_NOIO);
1280         if (status) {
1281                 // something went wrong
1282                 usb_free_urb(urb);
1283                 return status;
1284         }
1285
1286         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1287                 // timeout
1288                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1289                 usb_kill_urb(urb);  // remove urb safely
1290                 status = -ETIMEDOUT;
1291         }
1292         else {
1293                 status = urb->status;
1294         }
1295
1296         if (actual_length) {
1297                 *actual_length = urb->actual_length;
1298         }
1299
1300         usb_free_urb(urb);
1301         return status;
1302 }
1303
1304 /*-------------------------------------------------------------------*/
1305 // returns status (negative) or length (positive)
1306 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1307                                        unsigned int pipe,
1308                                        struct usb_ctrlrequest *cmd, void *data,
1309                                        int len, int timeout)
1310 {
1311         struct urb *urb;
1312         int retv;
1313         int length = 0; /* shut up GCC */
1314
1315         urb = usb_alloc_urb(0, GFP_ATOMIC);
1316         if (!urb)
1317                 return -ENOMEM;
1318
1319         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1320                          len, usb_api_blocking_completion, NULL);
1321
1322         retv = usb_start_wait_urb(urb, timeout, &length);
1323         if (retv < 0) {
1324                 return retv;
1325         }
1326         else {
1327                 return length;
1328         }
1329 }
1330
1331 module_usb_driver(kaweth_driver);