drivers/net/usb/kaweth.c

   1 /****************************************************************
   2  *
   3  *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
   4  *
   5  *     (c) 2000 Interlan Communications
   6  *     (c) 2000 Stephane Alnet
   7  *     (C) 2001 Brad Hards
   8  *     (C) 2002 Oliver Neukum
   9  *
  10  *     Original author: The Zapman <zapman@interlan.net>
  11  *     Inspired by, and much credit goes to Michael Rothwell
  12  *     <rothwell@interlan.net> for the test equipment, help, and patience
  13  *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
  14  *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
  15  *     for providing the firmware and driver resources.
  16  *
  17  *     This program is free software; you can redistribute it and/or
  18  *     modify it under the terms of the GNU General Public License as
  19  *     published by the Free Software Foundation; either version 2, or
  20  *     (at your option) any later version.
  21  *
  22  *     This program is distributed in the hope that it will be useful,
  23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *     GNU General Public License for more details.
  26  *
  27  *     You should have received a copy of the GNU General Public License
  28  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  29  *
  30  ****************************************************************/
  31
  32 /* TODO:
  33  * Develop test procedures for USB net interfaces
  34  * Run test procedures
  35  * Fix bugs from previous two steps
  36  * Snoop other OSs for any tricks we're not doing
  37  * Reduce arbitrary timeouts
  38  * Smart multicast support
  39  * Temporary MAC change support
  40  * Tunable SOFs parameter - ioctl()?
  41  * Ethernet stats collection
  42  * Code formatting improvements
  43  */
  44
  45 #include <linux/module.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/delay.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/usb.h>
  52 #include <linux/types.h>
  53 #include <linux/ethtool.h>
  54 #include <linux/dma-mapping.h>
  55 #include <linux/wait.h>
  56 #include <linux/firmware.h>
  57 #include <asm/uaccess.h>
  58 #include <asm/byteorder.h>
  59
  60 #undef DEBUG
  61
  62 #define KAWETH_MTU                      1514
  63 #define KAWETH_BUF_SIZE                 1664
  64 #define KAWETH_TX_TIMEOUT               (5 * HZ)
  65 #define KAWETH_SCRATCH_SIZE             32
  66 #define KAWETH_FIRMWARE_BUF_SIZE        4096
  67 #define KAWETH_CONTROL_TIMEOUT          (30000)
  68
  69 #define KAWETH_STATUS_BROKEN            0x0000001
  70 #define KAWETH_STATUS_CLOSING           0x0000002
  71 #define KAWETH_STATUS_SUSPENDING        0x0000004
  72
  73 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
  74
  75 #define KAWETH_PACKET_FILTER_PROMISCUOUS        0x01
  76 #define KAWETH_PACKET_FILTER_ALL_MULTICAST      0x02
  77 #define KAWETH_PACKET_FILTER_DIRECTED           0x04
  78 #define KAWETH_PACKET_FILTER_BROADCAST          0x08
  79 #define KAWETH_PACKET_FILTER_MULTICAST          0x10
  80
  81 /* Table 7 */
  82 #define KAWETH_COMMAND_GET_ETHERNET_DESC        0x00
  83 #define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
  84 #define KAWETH_COMMAND_SET_PACKET_FILTER        0x02
  85 #define KAWETH_COMMAND_STATISTICS               0x03
  86 #define KAWETH_COMMAND_SET_TEMP_MAC             0x06
  87 #define KAWETH_COMMAND_GET_TEMP_MAC             0x07
  88 #define KAWETH_COMMAND_SET_URB_SIZE             0x08
  89 #define KAWETH_COMMAND_SET_SOFS_WAIT            0x09
  90 #define KAWETH_COMMAND_SCAN                     0xFF
  91
  92 #define KAWETH_SOFS_TO_WAIT                     0x05
  93
  94 #define INTBUFFERSIZE                           4
  95
  96 #define STATE_OFFSET                            0
  97 #define STATE_MASK                              0x40
  98 #define STATE_SHIFT                             5
  99
 100 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
 101
 102
 103 MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
 104 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
 105 MODULE_LICENSE("GPL");
 106 /*(DEBLOBBED)*/
 107
 108 static const char driver_name[] = "kaweth";
 109
 110 static int kaweth_probe(
 111                 struct usb_interface *intf,
 112                 const struct usb_device_id *id  /* from id_table */
 113         );
 114 static void kaweth_disconnect(struct usb_interface *intf);
 115 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
 116                                        unsigned int pipe,
 117                                        struct usb_ctrlrequest *cmd, void *data,
 118                                        int len, int timeout);
 119 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 120 static int kaweth_resume(struct usb_interface *intf);
 121
 122 /****************************************************************
 123  *     usb_device_id
 124  ****************************************************************/
 125 static struct usb_device_id usb_klsi_table[] = {
 126         { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 127         { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 128         { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 129         { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 130         { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 131         { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 132         { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 133         { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 134         { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 135         { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 136         { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 137         { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 138         { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 139         { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 140         { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 141         { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 142         { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 143         { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 144         { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 145         { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 146         { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 147         { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 148         { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 149         { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 150         { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 151         { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 152         { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 153         { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 154         { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
 155         { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 156         { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 157         { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 158         { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 159         { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 160         { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 161         {} /* Null terminator */
 162 };
 163
 164 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 165
 166 /****************************************************************
 167  *     kaweth_driver
 168  ****************************************************************/
 169 static struct usb_driver kaweth_driver = {
 170         .name =         driver_name,
 171         .probe =        kaweth_probe,
 172         .disconnect =   kaweth_disconnect,
 173         .suspend =      kaweth_suspend,
 174         .resume =       kaweth_resume,
 175         .id_table =     usb_klsi_table,
 176         .supports_autosuspend = 1,
 177         .disable_hub_initiated_lpm = 1,
 178 };
 179
 180 typedef __u8 eth_addr_t[6];
 181
 182 /****************************************************************
 183  *     usb_eth_dev
 184  ****************************************************************/
 185 struct usb_eth_dev {
 186         char *name;
 187         __u16 vendor;
 188         __u16 device;
 189         void *pdata;
 190 };
 191
 192 /****************************************************************
 193  *     kaweth_ethernet_configuration
 194  *     Refer Table 8
 195  ****************************************************************/
 196 struct kaweth_ethernet_configuration
 197 {
 198         __u8 size;
 199         __u8 reserved1;
 200         __u8 reserved2;
 201         eth_addr_t hw_addr;
 202         __u32 statistics_mask;
 203         __le16 segment_size;
 204         __u16 max_multicast_filters;
 205         __u8 reserved3;
 206 } __packed;
 207
 208 /****************************************************************
 209  *     kaweth_device
 210  ****************************************************************/
 211 struct kaweth_device
 212 {
 213         spinlock_t device_lock;
 214
 215         __u32 status;
 216         int end;
 217         int suspend_lowmem_rx;
 218         int suspend_lowmem_ctrl;
 219         int linkstate;
 220         int opened;
 221         struct delayed_work lowmem_work;
 222
 223         struct usb_device *dev;
 224         struct usb_interface *intf;
 225         struct net_device *net;
 226         wait_queue_head_t term_wait;
 227
 228         struct urb *rx_urb;
 229         struct urb *tx_urb;
 230         struct urb *irq_urb;
 231
 232         dma_addr_t intbufferhandle;
 233         __u8 *intbuffer;
 234         dma_addr_t rxbufferhandle;
 235         __u8 *rx_buf;
 236
 237
 238         struct sk_buff *tx_skb;
 239
 240         __u8 *firmware_buf;
 241         __u8 scratch[KAWETH_SCRATCH_SIZE];
 242         __u16 packet_filter_bitmap;
 243
 244         struct kaweth_ethernet_configuration configuration;
 245
 246         struct net_device_stats stats;
 247 };
 248
 249 /****************************************************************
 250  *     kaweth_control
 251  ****************************************************************/
 252 static int kaweth_control(struct kaweth_device *kaweth,
 253                           unsigned int pipe,
 254                           __u8 request,
 255                           __u8 requesttype,
 256                           __u16 value,
 257                           __u16 index,
 258                           void *data,
 259                           __u16 size,
 260                           int timeout)
 261 {
 262         struct usb_ctrlrequest *dr;
 263         int retval;
 264
 265         if(in_interrupt()) {
 266                 netdev_dbg(kaweth->net, "in_interrupt()\n");
 267                 return -EBUSY;
 268         }
 269
 270         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
 271         if (!dr)
 272                 return -ENOMEM;
 273
 274         dr->bRequestType = requesttype;
 275         dr->bRequest = request;
 276         dr->wValue = cpu_to_le16(value);
 277         dr->wIndex = cpu_to_le16(index);
 278         dr->wLength = cpu_to_le16(size);
 279
 280         retval = kaweth_internal_control_msg(kaweth->dev,
 281                                              pipe,
 282                                              dr,
 283                                              data,
 284                                              size,
 285                                              timeout);
 286
 287         kfree(dr);
 288         return retval;
 289 }
 290
 291 /****************************************************************
 292  *     kaweth_read_configuration
 293  ****************************************************************/
 294 static int kaweth_read_configuration(struct kaweth_device *kaweth)
 295 {
 296         int retval;
 297
 298         retval = kaweth_control(kaweth,
 299                                 usb_rcvctrlpipe(kaweth->dev, 0),
 300                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
 301                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 302                                 0,
 303                                 0,
 304                                 (void *)&kaweth->configuration,
 305                                 sizeof(kaweth->configuration),
 306                                 KAWETH_CONTROL_TIMEOUT);
 307
 308         return retval;
 309 }
 310
 311 /****************************************************************
 312  *     kaweth_set_urb_size
 313  ****************************************************************/
 314 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 315 {
 316         int retval;
 317
 318         netdev_dbg(kaweth->net, "Setting URB size to %d\n", (unsigned)urb_size);
 319
 320         retval = kaweth_control(kaweth,
 321                                 usb_sndctrlpipe(kaweth->dev, 0),
 322                                 KAWETH_COMMAND_SET_URB_SIZE,
 323                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 324                                 urb_size,
 325                                 0,
 326                                 (void *)&kaweth->scratch,
 327                                 0,
 328                                 KAWETH_CONTROL_TIMEOUT);
 329
 330         return retval;
 331 }
 332
 333 /****************************************************************
 334  *     kaweth_set_sofs_wait
 335  ****************************************************************/
 336 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 337 {
 338         int retval;
 339
 340         netdev_dbg(kaweth->net, "Set SOFS wait to %d\n", (unsigned)sofs_wait);
 341
 342         retval = kaweth_control(kaweth,
 343                                 usb_sndctrlpipe(kaweth->dev, 0),
 344                                 KAWETH_COMMAND_SET_SOFS_WAIT,
 345                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 346                                 sofs_wait,
 347                                 0,
 348                                 (void *)&kaweth->scratch,
 349                                 0,
 350                                 KAWETH_CONTROL_TIMEOUT);
 351
 352         return retval;
 353 }
 354
 355 /****************************************************************
 356  *     kaweth_set_receive_filter
 357  ****************************************************************/
 358 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 359                                      __u16 receive_filter)
 360 {
 361         int retval;
 362
 363         netdev_dbg(kaweth->net, "Set receive filter to %d\n",
 364                    (unsigned)receive_filter);
 365
 366         retval = kaweth_control(kaweth,
 367                                 usb_sndctrlpipe(kaweth->dev, 0),
 368                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 369                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 370                                 receive_filter,
 371                                 0,
 372                                 (void *)&kaweth->scratch,
 373                                 0,
 374                                 KAWETH_CONTROL_TIMEOUT);
 375
 376         return retval;
 377 }
 378
 379 /****************************************************************
 380  *     kaweth_download_firmware
 381  ****************************************************************/
 382 static int kaweth_download_firmware(struct kaweth_device *kaweth,
 383                                     const char *fwname,
 384                                     __u8 interrupt,
 385                                     __u8 type)
 386 {
 387         const struct firmware *fw;
 388         int data_len;
 389         int ret;
 390
 391         ret = reject_firmware(&fw, fwname, &kaweth->dev->dev);
 392         if (ret) {
 393                 dev_err(&kaweth->intf->dev, "Firmware request failed\n");
 394                 return ret;
 395         }
 396
 397         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 398                 dev_err(&kaweth->intf->dev, "Firmware too big: %zu\n",
 399                         fw->size);
 400                 release_firmware(fw);
 401                 return -ENOSPC;
 402         }
 403         data_len = fw->size;
 404         memcpy(kaweth->firmware_buf, fw->data, fw->size);
 405
 406         release_firmware(fw);
 407
 408         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 409         kaweth->firmware_buf[3] = data_len >> 8;
 410         kaweth->firmware_buf[4] = type;
 411         kaweth->firmware_buf[5] = interrupt;
 412
 413         netdev_dbg(kaweth->net, "High: %i, Low:%i\n", kaweth->firmware_buf[3],
 414                    kaweth->firmware_buf[2]);
 415
 416         netdev_dbg(kaweth->net,
 417                    "Downloading firmware at %p to kaweth device at %p\n",
 418                    kaweth->firmware_buf, kaweth);
 419         netdev_dbg(kaweth->net, "Firmware length: %d\n", data_len);
 420
 421         return kaweth_control(kaweth,
 422                               usb_sndctrlpipe(kaweth->dev, 0),
 423                               KAWETH_COMMAND_SCAN,
 424                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 425                               0,
 426                               0,
 427                               (void *)kaweth->firmware_buf,
 428                               data_len,
 429                               KAWETH_CONTROL_TIMEOUT);
 430 }
 431
 432 /****************************************************************
 433  *     kaweth_trigger_firmware
 434  ****************************************************************/
 435 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
 436                                    __u8 interrupt)
 437 {
 438         kaweth->firmware_buf[0] = 0xB6;
 439         kaweth->firmware_buf[1] = 0xC3;
 440         kaweth->firmware_buf[2] = 0x01;
 441         kaweth->firmware_buf[3] = 0x00;
 442         kaweth->firmware_buf[4] = 0x06;
 443         kaweth->firmware_buf[5] = interrupt;
 444         kaweth->firmware_buf[6] = 0x00;
 445         kaweth->firmware_buf[7] = 0x00;
 446
 447         return kaweth_control(kaweth,
 448                               usb_sndctrlpipe(kaweth->dev, 0),
 449                               KAWETH_COMMAND_SCAN,
 450                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 451                               0,
 452                               0,
 453                               (void *)kaweth->firmware_buf,
 454                               8,
 455                               KAWETH_CONTROL_TIMEOUT);
 456 }
 457
 458 /****************************************************************
 459  *     kaweth_reset
 460  ****************************************************************/
 461 static int kaweth_reset(struct kaweth_device *kaweth)
 462 {
 463         int result;
 464
 465         result = usb_reset_configuration(kaweth->dev);
 466         mdelay(10);
 467
 468         netdev_dbg(kaweth->net, "kaweth_reset() returns %d.\n", result);
 469
 470         return result;
 471 }
 472
 473 static void kaweth_usb_receive(struct urb *);
 474 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
 475
 476 /****************************************************************
 477         int_callback
 478 *****************************************************************/
 479
 480 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
 481 {
 482         int status;
 483
 484         status = usb_submit_urb (kaweth->irq_urb, mf);
 485         if (unlikely(status == -ENOMEM)) {
 486                 kaweth->suspend_lowmem_ctrl = 1;
 487                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 488         } else {
 489                 kaweth->suspend_lowmem_ctrl = 0;
 490         }
 491
 492         if (status)
 493                 dev_err(&kaweth->intf->dev,
 494                         "can't resubmit intr, %s-%s, status %d\n",
 495                         kaweth->dev->bus->bus_name,
 496                         kaweth->dev->devpath, status);
 497 }
 498
 499 static void int_callback(struct urb *u)
 500 {
 501         struct kaweth_device *kaweth = u->context;
 502         int act_state;
 503         int status = u->status;
 504
 505         switch (status) {
 506         case 0:                 /* success */
 507                 break;
 508         case -ECONNRESET:       /* unlink */
 509         case -ENOENT:
 510         case -ESHUTDOWN:
 511                 return;
 512         /* -EPIPE:  should clear the halt */
 513         default:                /* error */
 514                 goto resubmit;
 515         }
 516
 517         /* we check the link state to report changes */
 518         if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
 519                 if (act_state)
 520                         netif_carrier_on(kaweth->net);
 521                 else
 522                         netif_carrier_off(kaweth->net);
 523
 524                 kaweth->linkstate = act_state;
 525         }
 526 resubmit:
 527         kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
 528 }
 529
 530 static void kaweth_resubmit_tl(struct work_struct *work)
 531 {
 532         struct kaweth_device *kaweth =
 533                 container_of(work, struct kaweth_device, lowmem_work.work);
 534
 535         if (IS_BLOCKED(kaweth->status))
 536                 return;
 537
 538         if (kaweth->suspend_lowmem_rx)
 539                 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 540
 541         if (kaweth->suspend_lowmem_ctrl)
 542                 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 543 }
 544
 545
 546 /****************************************************************
 547  *     kaweth_resubmit_rx_urb
 548  ****************************************************************/
 549 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
 550                                                 gfp_t mem_flags)
 551 {
 552         int result;
 553
 554         usb_fill_bulk_urb(kaweth->rx_urb,
 555                       kaweth->dev,
 556                       usb_rcvbulkpipe(kaweth->dev, 1),
 557                       kaweth->rx_buf,
 558                       KAWETH_BUF_SIZE,
 559                       kaweth_usb_receive,
 560                       kaweth);
 561         kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 562         kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
 563
 564         if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
 565                 if (result == -ENOMEM) {
 566                         kaweth->suspend_lowmem_rx = 1;
 567                         schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 568                 }
 569                 dev_err(&kaweth->intf->dev, "resubmitting rx_urb %d failed\n",
 570                         result);
 571         } else {
 572                 kaweth->suspend_lowmem_rx = 0;
 573         }
 574
 575         return result;
 576 }
 577
 578 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
 579
 580 /****************************************************************
 581  *     kaweth_usb_receive
 582  ****************************************************************/
 583 static void kaweth_usb_receive(struct urb *urb)
 584 {
 585         struct device *dev = &urb->dev->dev;
 586         struct kaweth_device *kaweth = urb->context;
 587         struct net_device *net = kaweth->net;
 588         int status = urb->status;
 589
 590         int count = urb->actual_length;
 591         int count2 = urb->transfer_buffer_length;
 592
 593         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 594
 595         struct sk_buff *skb;
 596
 597         if (unlikely(status == -EPIPE)) {
 598                 kaweth->stats.rx_errors++;
 599                 kaweth->end = 1;
 600                 wake_up(&kaweth->term_wait);
 601                 dev_dbg(dev, "Status was -EPIPE.\n");
 602                 return;
 603         }
 604         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 605                 /* we are killed - set a flag and wake the disconnect handler */
 606                 kaweth->end = 1;
 607                 wake_up(&kaweth->term_wait);
 608                 dev_dbg(dev, "Status was -ECONNRESET or -ESHUTDOWN.\n");
 609                 return;
 610         }
 611         if (unlikely(status == -EPROTO || status == -ETIME ||
 612                      status == -EILSEQ)) {
 613                 kaweth->stats.rx_errors++;
 614                 dev_dbg(dev, "Status was -EPROTO, -ETIME, or -EILSEQ.\n");
 615                 return;
 616         }
 617         if (unlikely(status == -EOVERFLOW)) {
 618                 kaweth->stats.rx_errors++;
 619                 dev_dbg(dev, "Status was -EOVERFLOW.\n");
 620         }
 621         spin_lock(&kaweth->device_lock);
 622         if (IS_BLOCKED(kaweth->status)) {
 623                 spin_unlock(&kaweth->device_lock);
 624                 return;
 625         }
 626         spin_unlock(&kaweth->device_lock);
 627
 628         if(status && status != -EREMOTEIO && count != 1) {
 629                 dev_err(&kaweth->intf->dev,
 630                         "%s RX status: %d count: %d packet_len: %d\n",
 631                         net->name, status, count, (int)pkt_len);
 632                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 633                 return;
 634         }
 635
 636         if(kaweth->net && (count > 2)) {
 637                 if(pkt_len > (count - 2)) {
 638                         dev_err(&kaweth->intf->dev,
 639                                 "Packet length too long for USB frame (pkt_len: %x, count: %x)\n",
 640                                 pkt_len, count);
 641                         dev_err(&kaweth->intf->dev, "Packet len & 2047: %x\n",
 642                                 pkt_len & 2047);
 643                         dev_err(&kaweth->intf->dev, "Count 2: %x\n", count2);
 644                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 645                         return;
 646                 }
 647
 648                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
 649                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 650                         return;
 651                 }
 652
 653                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 654
 655                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 656
 657                 skb_put(skb, pkt_len);
 658
 659                 skb->protocol = eth_type_trans(skb, net);
 660
 661                 netif_rx(skb);
 662
 663                 kaweth->stats.rx_packets++;
 664                 kaweth->stats.rx_bytes += pkt_len;
 665         }
 666
 667         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 668 }
 669
 670 /****************************************************************
 671  *     kaweth_open
 672  ****************************************************************/
 673 static int kaweth_open(struct net_device *net)
 674 {
 675         struct kaweth_device *kaweth = netdev_priv(net);
 676         int res;
 677
 678         res = usb_autopm_get_interface(kaweth->intf);
 679         if (res) {
 680                 dev_err(&kaweth->intf->dev, "Interface cannot be resumed.\n");
 681                 return -EIO;
 682         }
 683         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 684         if (res)
 685                 goto err_out;
 686
 687         usb_fill_int_urb(
 688                 kaweth->irq_urb,
 689                 kaweth->dev,
 690                 usb_rcvintpipe(kaweth->dev, 3),
 691                 kaweth->intbuffer,
 692                 INTBUFFERSIZE,
 693                 int_callback,
 694                 kaweth,
 695                 250); /* overriding the descriptor */
 696         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 697         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 698
 699         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 700         if (res) {
 701                 usb_kill_urb(kaweth->rx_urb);
 702                 goto err_out;
 703         }
 704         kaweth->opened = 1;
 705
 706         netif_start_queue(net);
 707
 708         kaweth_async_set_rx_mode(kaweth);
 709         return 0;
 710
 711 err_out:
 712         usb_autopm_put_interface(kaweth->intf);
 713         return -EIO;
 714 }
 715
 716 /****************************************************************
 717  *     kaweth_kill_urbs
 718  ****************************************************************/
 719 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 720 {
 721         usb_kill_urb(kaweth->irq_urb);
 722         usb_kill_urb(kaweth->rx_urb);
 723         usb_kill_urb(kaweth->tx_urb);
 724
 725         cancel_delayed_work_sync(&kaweth->lowmem_work);
 726
 727         /* a scheduled work may have resubmitted,
 728            we hit them again */
 729         usb_kill_urb(kaweth->irq_urb);
 730         usb_kill_urb(kaweth->rx_urb);
 731 }
 732
 733 /****************************************************************
 734  *     kaweth_close
 735  ****************************************************************/
 736 static int kaweth_close(struct net_device *net)
 737 {
 738         struct kaweth_device *kaweth = netdev_priv(net);
 739
 740         netif_stop_queue(net);
 741         kaweth->opened = 0;
 742
 743         kaweth->status |= KAWETH_STATUS_CLOSING;
 744
 745         kaweth_kill_urbs(kaweth);
 746
 747         kaweth->status &= ~KAWETH_STATUS_CLOSING;
 748
 749         usb_autopm_put_interface(kaweth->intf);
 750
 751         return 0;
 752 }
 753
 754 static u32 kaweth_get_link(struct net_device *dev)
 755 {
 756         struct kaweth_device *kaweth = netdev_priv(dev);
 757
 758         return kaweth->linkstate;
 759 }
 760
 761 static const struct ethtool_ops ops = {
 762         .get_link       = kaweth_get_link
 763 };
 764
 765 /****************************************************************
 766  *     kaweth_usb_transmit_complete
 767  ****************************************************************/
 768 static void kaweth_usb_transmit_complete(struct urb *urb)
 769 {
 770         struct kaweth_device *kaweth = urb->context;
 771         struct sk_buff *skb = kaweth->tx_skb;
 772         int status = urb->status;
 773
 774         if (unlikely(status != 0))
 775                 if (status != -ENOENT)
 776                         dev_dbg(&urb->dev->dev, "%s: TX status %d.\n",
 777                                 kaweth->net->name, status);
 778
 779         netif_wake_queue(kaweth->net);
 780         dev_kfree_skb_irq(skb);
 781 }
 782
 783 /****************************************************************
 784  *     kaweth_start_xmit
 785  ****************************************************************/
 786 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 787                                            struct net_device *net)
 788 {
 789         struct kaweth_device *kaweth = netdev_priv(net);
 790         __le16 *private_header;
 791
 792         int res;
 793
 794         spin_lock_irq(&kaweth->device_lock);
 795
 796         kaweth_async_set_rx_mode(kaweth);
 797         netif_stop_queue(net);
 798         if (IS_BLOCKED(kaweth->status)) {
 799                 goto skip;
 800         }
 801
 802         /* We now decide whether we can put our special header into the sk_buff */
 803         if (skb_cloned(skb) || skb_headroom(skb) < 2) {
 804                 /* no such luck - we make our own */
 805                 struct sk_buff *copied_skb;
 806                 copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
 807                 dev_kfree_skb_irq(skb);
 808                 skb = copied_skb;
 809                 if (!copied_skb) {
 810                         kaweth->stats.tx_errors++;
 811                         netif_start_queue(net);
 812                         spin_unlock_irq(&kaweth->device_lock);
 813                         return NETDEV_TX_OK;
 814                 }
 815         }
 816
 817         private_header = (__le16 *)__skb_push(skb, 2);
 818         *private_header = cpu_to_le16(skb->len-2);
 819         kaweth->tx_skb = skb;
 820
 821         usb_fill_bulk_urb(kaweth->tx_urb,
 822                       kaweth->dev,
 823                       usb_sndbulkpipe(kaweth->dev, 2),
 824                       private_header,
 825                       skb->len,
 826                       kaweth_usb_transmit_complete,
 827                       kaweth);
 828         kaweth->end = 0;
 829
 830         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 831         {
 832                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 833 skip:
 834                 kaweth->stats.tx_errors++;
 835
 836                 netif_start_queue(net);
 837                 dev_kfree_skb_irq(skb);
 838         }
 839         else
 840         {
 841                 kaweth->stats.tx_packets++;
 842                 kaweth->stats.tx_bytes += skb->len;
 843         }
 844
 845         spin_unlock_irq(&kaweth->device_lock);
 846
 847         return NETDEV_TX_OK;
 848 }
 849
 850 /****************************************************************
 851  *     kaweth_set_rx_mode
 852  ****************************************************************/
 853 static void kaweth_set_rx_mode(struct net_device *net)
 854 {
 855         struct kaweth_device *kaweth = netdev_priv(net);
 856
 857         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 858                                      KAWETH_PACKET_FILTER_BROADCAST |
 859                                      KAWETH_PACKET_FILTER_MULTICAST;
 860
 861         netdev_dbg(net, "Setting Rx mode to %d\n", packet_filter_bitmap);
 862
 863         netif_stop_queue(net);
 864
 865         if (net->flags & IFF_PROMISC) {
 866                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 867         }
 868         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 869                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 870         }
 871
 872         kaweth->packet_filter_bitmap = packet_filter_bitmap;
 873         netif_wake_queue(net);
 874 }
 875
 876 /****************************************************************
 877  *     kaweth_async_set_rx_mode
 878  ****************************************************************/
 879 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 880 {
 881         int result;
 882         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 883
 884         kaweth->packet_filter_bitmap = 0;
 885         if (packet_filter_bitmap == 0)
 886                 return;
 887
 888         if (in_interrupt())
 889                 return;
 890
 891         result = kaweth_control(kaweth,
 892                                 usb_sndctrlpipe(kaweth->dev, 0),
 893                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 894                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 895                                 packet_filter_bitmap,
 896                                 0,
 897                                 (void *)&kaweth->scratch,
 898                                 0,
 899                                 KAWETH_CONTROL_TIMEOUT);
 900
 901         if(result < 0) {
 902                 dev_err(&kaweth->intf->dev, "Failed to set Rx mode: %d\n",
 903                         result);
 904         }
 905         else {
 906                 netdev_dbg(kaweth->net, "Set Rx mode to %d\n",
 907                            packet_filter_bitmap);
 908         }
 909 }
 910
 911 /****************************************************************
 912  *     kaweth_netdev_stats
 913  ****************************************************************/
 914 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
 915 {
 916         struct kaweth_device *kaweth = netdev_priv(dev);
 917         return &kaweth->stats;
 918 }
 919
 920 /****************************************************************
 921  *     kaweth_tx_timeout
 922  ****************************************************************/
 923 static void kaweth_tx_timeout(struct net_device *net)
 924 {
 925         struct kaweth_device *kaweth = netdev_priv(net);
 926
 927         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 928         kaweth->stats.tx_errors++;
 929         netif_trans_update(net);
 930
 931         usb_unlink_urb(kaweth->tx_urb);
 932 }
 933
 934 /****************************************************************
 935  *     kaweth_suspend
 936  ****************************************************************/
 937 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 938 {
 939         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 940         unsigned long flags;
 941
 942         spin_lock_irqsave(&kaweth->device_lock, flags);
 943         kaweth->status |= KAWETH_STATUS_SUSPENDING;
 944         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 945
 946         kaweth_kill_urbs(kaweth);
 947         return 0;
 948 }
 949
 950 /****************************************************************
 951  *     kaweth_resume
 952  ****************************************************************/
 953 static int kaweth_resume(struct usb_interface *intf)
 954 {
 955         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 956         unsigned long flags;
 957
 958         spin_lock_irqsave(&kaweth->device_lock, flags);
 959         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 960         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 961
 962         if (!kaweth->opened)
 963                 return 0;
 964         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 965         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 966
 967         return 0;
 968 }
 969
 970 /****************************************************************
 971  *     kaweth_probe
 972  ****************************************************************/
 973
 974
 975 static const struct net_device_ops kaweth_netdev_ops = {
 976         .ndo_open =                     kaweth_open,
 977         .ndo_stop =                     kaweth_close,
 978         .ndo_start_xmit =               kaweth_start_xmit,
 979         .ndo_tx_timeout =               kaweth_tx_timeout,
 980         .ndo_set_rx_mode =              kaweth_set_rx_mode,
 981         .ndo_get_stats =                kaweth_netdev_stats,
 982         .ndo_change_mtu =               eth_change_mtu,
 983         .ndo_set_mac_address =          eth_mac_addr,
 984         .ndo_validate_addr =            eth_validate_addr,
 985 };
 986
 987 static int kaweth_probe(
 988                 struct usb_interface *intf,
 989                 const struct usb_device_id *id      /* from id_table */
 990         )
 991 {
 992         struct device *dev = &intf->dev;
 993         struct usb_device *udev = interface_to_usbdev(intf);
 994         struct kaweth_device *kaweth;
 995         struct net_device *netdev;
 996         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 997         int result = 0;
 998         int rv = -EIO;
 999
1000         dev_dbg(dev,
1001                 "Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x\n",
1002                 udev->devnum, le16_to_cpu(udev->descriptor.idVendor),
1003                 le16_to_cpu(udev->descriptor.idProduct),
1004                 le16_to_cpu(udev->descriptor.bcdDevice));
1005
1006         dev_dbg(dev, "Device at %p\n", udev);
1007
1008         dev_dbg(dev, "Descriptor length: %x type: %x\n",
1009                 (int)udev->descriptor.bLength,
1010                 (int)udev->descriptor.bDescriptorType);
1011
1012         netdev = alloc_etherdev(sizeof(*kaweth));
1013         if (!netdev)
1014                 return -ENOMEM;
1015
1016         kaweth = netdev_priv(netdev);
1017         kaweth->dev = udev;
1018         kaweth->net = netdev;
1019         kaweth->intf = intf;
1020
1021         spin_lock_init(&kaweth->device_lock);
1022         init_waitqueue_head(&kaweth->term_wait);
1023
1024         dev_dbg(dev, "Resetting.\n");
1025
1026         kaweth_reset(kaweth);
1027
1028         /*
1029          * If high byte of bcdDevice is nonzero, firmware is already
1030          * downloaded. Don't try to do it again, or we'll hang the device.
1031          */
1032
1033         if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
1034                 dev_info(dev, "Firmware present in device.\n");
1035         } else {
1036                 /* Download the firmware */
1037                 dev_info(dev, "Downloading firmware...\n");
1038                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1039                 if (!kaweth->firmware_buf) {
1040                         rv = -ENOMEM;
1041                         goto err_free_netdev;
1042                 }
1043                 if ((result = kaweth_download_firmware(kaweth,
1044                                                       "/*(DEBLOBBED)*/",
1045                                                       100,
1046                                                       2)) < 0) {
1047                         dev_err(dev, "Error downloading firmware (%d)\n",
1048                                 result);
1049                         goto err_fw;
1050                 }
1051
1052                 if ((result = kaweth_download_firmware(kaweth,
1053                                                       "/*(DEBLOBBED)*/",
1054                                                       100,
1055                                                       3)) < 0) {
1056                         dev_err(dev, "Error downloading firmware fix (%d)\n",
1057                                 result);
1058                         goto err_fw;
1059                 }
1060
1061                 if ((result = kaweth_download_firmware(kaweth,
1062                                                       "/*(DEBLOBBED)*/",
1063                                                       126,
1064                                                       2)) < 0) {
1065                         dev_err(dev, "Error downloading trigger code (%d)\n",
1066                                 result);
1067                         goto err_fw;
1068
1069                 }
1070
1071                 if ((result = kaweth_download_firmware(kaweth,
1072                                                       "/*(DEBLOBBED)*/",
1073                                                       126,
1074                                                       3)) < 0) {
1075                         dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
1076                         goto err_fw;
1077                 }
1078
1079
1080                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1081                         dev_err(dev, "Error triggering firmware (%d)\n", result);
1082                         goto err_fw;
1083                 }
1084
1085                 /* Device will now disappear for a moment...  */
1086                 dev_info(dev, "Firmware loaded.  I'll be back...\n");
1087 err_fw:
1088                 free_page((unsigned long)kaweth->firmware_buf);
1089                 free_netdev(netdev);
1090                 return -EIO;
1091         }
1092
1093         result = kaweth_read_configuration(kaweth);
1094
1095         if(result < 0) {
1096                 dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
1097                 goto err_free_netdev;
1098         }
1099
1100         dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1101         dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1102         dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1103         dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);
1104
1105         if(!memcmp(&kaweth->configuration.hw_addr,
1106                    &bcast_addr,
1107                    sizeof(bcast_addr))) {
1108                 dev_err(dev, "Firmware not functioning properly, no net device created\n");
1109                 goto err_free_netdev;
1110         }
1111
1112         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1113                 dev_dbg(dev, "Error setting URB size\n");
1114                 goto err_free_netdev;
1115         }
1116
1117         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1118                 dev_err(dev, "Error setting SOFS wait\n");
1119                 goto err_free_netdev;
1120         }
1121
1122         result = kaweth_set_receive_filter(kaweth,
1123                                            KAWETH_PACKET_FILTER_DIRECTED |
1124                                            KAWETH_PACKET_FILTER_BROADCAST |
1125                                            KAWETH_PACKET_FILTER_MULTICAST);
1126
1127         if(result < 0) {
1128                 dev_err(dev, "Error setting receive filter\n");
1129                 goto err_free_netdev;
1130         }
1131
1132         dev_dbg(dev, "Initializing net device.\n");
1133
1134         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1135         if (!kaweth->tx_urb)
1136                 goto err_free_netdev;
1137         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1138         if (!kaweth->rx_urb)
1139                 goto err_only_tx;
1140         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1141         if (!kaweth->irq_urb)
1142                 goto err_tx_and_rx;
1143
1144         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1145                                                 INTBUFFERSIZE,
1146                                                 GFP_KERNEL,
1147                                                 &kaweth->intbufferhandle);
1148         if (!kaweth->intbuffer)
1149                 goto err_tx_and_rx_and_irq;
1150         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1151                                                 KAWETH_BUF_SIZE,
1152                                                 GFP_KERNEL,
1153                                                 &kaweth->rxbufferhandle);
1154         if (!kaweth->rx_buf)
1155                 goto err_all_but_rxbuf;
1156
1157         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1158         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1159                sizeof(kaweth->configuration.hw_addr));
1160
1161         netdev->netdev_ops = &kaweth_netdev_ops;
1162         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1163         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1164         netdev->ethtool_ops = &ops;
1165
1166         /* kaweth is zeroed as part of alloc_netdev */
1167         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1168         usb_set_intfdata(intf, kaweth);
1169
1170         SET_NETDEV_DEV(netdev, dev);
1171         if (register_netdev(netdev) != 0) {
1172                 dev_err(dev, "Error registering netdev.\n");
1173                 goto err_intfdata;
1174         }
1175
1176         dev_info(dev, "kaweth interface created at %s\n",
1177                  kaweth->net->name);
1178
1179         return 0;
1180
1181 err_intfdata:
1182         usb_set_intfdata(intf, NULL);
1183         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1184 err_all_but_rxbuf:
1185         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1186 err_tx_and_rx_and_irq:
1187         usb_free_urb(kaweth->irq_urb);
1188 err_tx_and_rx:
1189         usb_free_urb(kaweth->rx_urb);
1190 err_only_tx:
1191         usb_free_urb(kaweth->tx_urb);
1192 err_free_netdev:
1193         free_netdev(netdev);
1194
1195         return rv;
1196 }
1197
1198 /****************************************************************
1199  *     kaweth_disconnect
1200  ****************************************************************/
1201 static void kaweth_disconnect(struct usb_interface *intf)
1202 {
1203         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1204         struct net_device *netdev;
1205
1206         usb_set_intfdata(intf, NULL);
1207         if (!kaweth) {
1208                 dev_warn(&intf->dev, "unregistering non-existent device\n");
1209                 return;
1210         }
1211         netdev = kaweth->net;
1212
1213         netdev_dbg(kaweth->net, "Unregistering net device\n");
1214         unregister_netdev(netdev);
1215
1216         usb_free_urb(kaweth->rx_urb);
1217         usb_free_urb(kaweth->tx_urb);
1218         usb_free_urb(kaweth->irq_urb);
1219
1220         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1221         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1222
1223         free_netdev(netdev);
1224 }
1225
1226
1227 // FIXME this completion stuff is a modified clone of
1228 // an OLD version of some stuff in usb.c ...
1229 struct usb_api_data {
1230         wait_queue_head_t wqh;
1231         int done;
1232 };
1233
1234 /*-------------------------------------------------------------------*
1235  * completion handler for compatibility wrappers (sync control/bulk) *
1236  *-------------------------------------------------------------------*/
1237 static void usb_api_blocking_completion(struct urb *urb)
1238 {
1239         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1240
1241         awd->done=1;
1242         wake_up(&awd->wqh);
1243 }
1244
1245 /*-------------------------------------------------------------------*
1246  *                         COMPATIBILITY STUFF                       *
1247  *-------------------------------------------------------------------*/
1248
1249 // Starts urb and waits for completion or timeout
1250 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1251 {
1252         struct usb_api_data awd;
1253         int status;
1254
1255         init_waitqueue_head(&awd.wqh);
1256         awd.done = 0;
1257
1258         urb->context = &awd;
1259         status = usb_submit_urb(urb, GFP_ATOMIC);
1260         if (status) {
1261                 // something went wrong
1262                 usb_free_urb(urb);
1263                 return status;
1264         }
1265
1266         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1267                 // timeout
1268                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1269                 usb_kill_urb(urb);  // remove urb safely
1270                 status = -ETIMEDOUT;
1271         }
1272         else {
1273                 status = urb->status;
1274         }
1275
1276         if (actual_length) {
1277                 *actual_length = urb->actual_length;
1278         }
1279
1280         usb_free_urb(urb);
1281         return status;
1282 }
1283
1284 /*-------------------------------------------------------------------*/
1285 // returns status (negative) or length (positive)
1286 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1287                                        unsigned int pipe,
1288                                        struct usb_ctrlrequest *cmd, void *data,
1289                                        int len, int timeout)
1290 {
1291         struct urb *urb;
1292         int retv;
1293         int length = 0; /* shut up GCC */
1294
1295         urb = usb_alloc_urb(0, GFP_ATOMIC);
1296         if (!urb)
1297                 return -ENOMEM;
1298
1299         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1300                          len, usb_api_blocking_completion, NULL);
1301
1302         retv = usb_start_wait_urb(urb, timeout, &length);
1303         if (retv < 0) {
1304                 return retv;
1305         }
1306         else {
1307                 return length;
1308         }
1309 }
1310
1311 module_usb_driver(kaweth_driver);