drivers/net/usb/kaweth.c

   1 /****************************************************************
   2  *
   3  *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
   4  *
   5  *     (c) 2000 Interlan Communications
   6  *     (c) 2000 Stephane Alnet
   7  *     (C) 2001 Brad Hards
   8  *     (C) 2002 Oliver Neukum
   9  *
  10  *     Original author: The Zapman <zapman@interlan.net>
  11  *     Inspired by, and much credit goes to Michael Rothwell
  12  *     <rothwell@interlan.net> for the test equipment, help, and patience
  13  *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
  14  *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
  15  *     for providing the firmware and driver resources.
  16  *
  17  *     This program is free software; you can redistribute it and/or
  18  *     modify it under the terms of the GNU General Public License as
  19  *     published by the Free Software Foundation; either version 2, or
  20  *     (at your option) any later version.
  21  *
  22  *     This program is distributed in the hope that it will be useful,
  23  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *     GNU General Public License for more details.
  26  *
  27  *     You should have received a copy of the GNU General Public License
  28  *     along with this program; if not, write to the Free Software Foundation,
  29  *     Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  30  *
  31  ****************************************************************/
  32
  33 /* TODO:
  34  * Develop test procedures for USB net interfaces
  35  * Run test procedures
  36  * Fix bugs from previous two steps
  37  * Snoop other OSs for any tricks we're not doing
  38  * Reduce arbitrary timeouts
  39  * Smart multicast support
  40  * Temporary MAC change support
  41  * Tunable SOFs parameter - ioctl()?
  42  * Ethernet stats collection
  43  * Code formatting improvements
  44  */
  45
  46 #include <linux/module.h>
  47 #include <linux/slab.h>
  48 #include <linux/string.h>
  49 #include <linux/init.h>
  50 #include <linux/delay.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/etherdevice.h>
  53 #include <linux/usb.h>
  54 #include <linux/types.h>
  55 #include <linux/ethtool.h>
  56 #include <linux/dma-mapping.h>
  57 #include <linux/wait.h>
  58 #include <linux/firmware.h>
  59 #include <asm/uaccess.h>
  60 #include <asm/byteorder.h>
  61
  62 #undef DEBUG
  63
  64 #define KAWETH_MTU                      1514
  65 #define KAWETH_BUF_SIZE                 1664
  66 #define KAWETH_TX_TIMEOUT               (5 * HZ)
  67 #define KAWETH_SCRATCH_SIZE             32
  68 #define KAWETH_FIRMWARE_BUF_SIZE        4096
  69 #define KAWETH_CONTROL_TIMEOUT          (30000)
  70
  71 #define KAWETH_STATUS_BROKEN            0x0000001
  72 #define KAWETH_STATUS_CLOSING           0x0000002
  73 #define KAWETH_STATUS_SUSPENDING        0x0000004
  74
  75 #define KAWETH_STATUS_BLOCKED (KAWETH_STATUS_CLOSING | KAWETH_STATUS_SUSPENDING)
  76
  77 #define KAWETH_PACKET_FILTER_PROMISCUOUS        0x01
  78 #define KAWETH_PACKET_FILTER_ALL_MULTICAST      0x02
  79 #define KAWETH_PACKET_FILTER_DIRECTED           0x04
  80 #define KAWETH_PACKET_FILTER_BROADCAST          0x08
  81 #define KAWETH_PACKET_FILTER_MULTICAST          0x10
  82
  83 /* Table 7 */
  84 #define KAWETH_COMMAND_GET_ETHERNET_DESC        0x00
  85 #define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
  86 #define KAWETH_COMMAND_SET_PACKET_FILTER        0x02
  87 #define KAWETH_COMMAND_STATISTICS               0x03
  88 #define KAWETH_COMMAND_SET_TEMP_MAC             0x06
  89 #define KAWETH_COMMAND_GET_TEMP_MAC             0x07
  90 #define KAWETH_COMMAND_SET_URB_SIZE             0x08
  91 #define KAWETH_COMMAND_SET_SOFS_WAIT            0x09
  92 #define KAWETH_COMMAND_SCAN                     0xFF
  93
  94 #define KAWETH_SOFS_TO_WAIT                     0x05
  95
  96 #define INTBUFFERSIZE                           4
  97
  98 #define STATE_OFFSET                            0
  99 #define STATE_MASK                              0x40
 100 #define STATE_SHIFT                             5
 101
 102 #define IS_BLOCKED(s) (s & KAWETH_STATUS_BLOCKED)
 103
 104
 105 MODULE_AUTHOR("Michael Zappe <zapman@interlan.net>, Stephane Alnet <stephane@u-picardie.fr>, Brad Hards <bhards@bigpond.net.au> and Oliver Neukum <oliver@neukum.org>");
 106 MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
 107 MODULE_LICENSE("GPL");
 108 MODULE_FIRMWARE("kaweth/new_code.bin");
 109 MODULE_FIRMWARE("kaweth/new_code_fix.bin");
 110 MODULE_FIRMWARE("kaweth/trigger_code.bin");
 111 MODULE_FIRMWARE("kaweth/trigger_code_fix.bin");
 112
 113 static const char driver_name[] = "kaweth";
 114
 115 static int kaweth_probe(
 116                 struct usb_interface *intf,
 117                 const struct usb_device_id *id  /* from id_table */
 118         );
 119 static void kaweth_disconnect(struct usb_interface *intf);
 120 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
 121                                        unsigned int pipe,
 122                                        struct usb_ctrlrequest *cmd, void *data,
 123                                        int len, int timeout);
 124 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message);
 125 static int kaweth_resume(struct usb_interface *intf);
 126
 127 /****************************************************************
 128  *     usb_device_id
 129  ****************************************************************/
 130 static struct usb_device_id usb_klsi_table[] = {
 131         { USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
 132         { USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
 133         { USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
 134         { USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
 135         { USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
 136         { USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
 137         { USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
 138         { USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
 139         { USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
 140         { USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
 141         { USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
 142         { USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
 143         { USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
 144         { USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
 145         { USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
 146         { USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
 147         { USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
 148         { USB_DEVICE(0x07c9, 0xb010) }, /* Allied Telesyn AT-USB10 USB Ethernet Adapter */
 149         { USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
 150         { USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
 151         { USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
 152         { USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
 153         { USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
 154         { USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
 155         { USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
 156         { USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
 157         { USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
 158         { USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
 159         { USB_DEVICE(0x1485, 0x0001) }, /* Silicom U2E */
 160         { USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
 161         { USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
 162         { USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
 163         { USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
 164         { USB_DEVICE(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
 165         { USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
 166         {} /* Null terminator */
 167 };
 168
 169 MODULE_DEVICE_TABLE (usb, usb_klsi_table);
 170
 171 /****************************************************************
 172  *     kaweth_driver
 173  ****************************************************************/
 174 static struct usb_driver kaweth_driver = {
 175         .name =         driver_name,
 176         .probe =        kaweth_probe,
 177         .disconnect =   kaweth_disconnect,
 178         .suspend =      kaweth_suspend,
 179         .resume =       kaweth_resume,
 180         .id_table =     usb_klsi_table,
 181         .supports_autosuspend = 1,
 182 };
 183
 184 typedef __u8 eth_addr_t[6];
 185
 186 /****************************************************************
 187  *     usb_eth_dev
 188  ****************************************************************/
 189 struct usb_eth_dev {
 190         char *name;
 191         __u16 vendor;
 192         __u16 device;
 193         void *pdata;
 194 };
 195
 196 /****************************************************************
 197  *     kaweth_ethernet_configuration
 198  *     Refer Table 8
 199  ****************************************************************/
 200 struct kaweth_ethernet_configuration
 201 {
 202         __u8 size;
 203         __u8 reserved1;
 204         __u8 reserved2;
 205         eth_addr_t hw_addr;
 206         __u32 statistics_mask;
 207         __le16 segment_size;
 208         __u16 max_multicast_filters;
 209         __u8 reserved3;
 210 } __packed;
 211
 212 /****************************************************************
 213  *     kaweth_device
 214  ****************************************************************/
 215 struct kaweth_device
 216 {
 217         spinlock_t device_lock;
 218
 219         __u32 status;
 220         int end;
 221         int suspend_lowmem_rx;
 222         int suspend_lowmem_ctrl;
 223         int linkstate;
 224         int opened;
 225         struct delayed_work lowmem_work;
 226
 227         struct usb_device *dev;
 228         struct usb_interface *intf;
 229         struct net_device *net;
 230         wait_queue_head_t term_wait;
 231
 232         struct urb *rx_urb;
 233         struct urb *tx_urb;
 234         struct urb *irq_urb;
 235
 236         dma_addr_t intbufferhandle;
 237         __u8 *intbuffer;
 238         dma_addr_t rxbufferhandle;
 239         __u8 *rx_buf;
 240
 241
 242         struct sk_buff *tx_skb;
 243
 244         __u8 *firmware_buf;
 245         __u8 scratch[KAWETH_SCRATCH_SIZE];
 246         __u16 packet_filter_bitmap;
 247
 248         struct kaweth_ethernet_configuration configuration;
 249
 250         struct net_device_stats stats;
 251 };
 252
 253 /****************************************************************
 254  *     kaweth_control
 255  ****************************************************************/
 256 static int kaweth_control(struct kaweth_device *kaweth,
 257                           unsigned int pipe,
 258                           __u8 request,
 259                           __u8 requesttype,
 260                           __u16 value,
 261                           __u16 index,
 262                           void *data,
 263                           __u16 size,
 264                           int timeout)
 265 {
 266         struct usb_ctrlrequest *dr;
 267         int retval;
 268
 269         dbg("kaweth_control()");
 270
 271         if(in_interrupt()) {
 272                 dbg("in_interrupt()");
 273                 return -EBUSY;
 274         }
 275
 276         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
 277
 278         if (!dr) {
 279                 dbg("kmalloc() failed");
 280                 return -ENOMEM;
 281         }
 282
 283         dr->bRequestType = requesttype;
 284         dr->bRequest = request;
 285         dr->wValue = cpu_to_le16(value);
 286         dr->wIndex = cpu_to_le16(index);
 287         dr->wLength = cpu_to_le16(size);
 288
 289         retval = kaweth_internal_control_msg(kaweth->dev,
 290                                              pipe,
 291                                              dr,
 292                                              data,
 293                                              size,
 294                                              timeout);
 295
 296         kfree(dr);
 297         return retval;
 298 }
 299
 300 /****************************************************************
 301  *     kaweth_read_configuration
 302  ****************************************************************/
 303 static int kaweth_read_configuration(struct kaweth_device *kaweth)
 304 {
 305         int retval;
 306
 307         dbg("Reading kaweth configuration");
 308
 309         retval = kaweth_control(kaweth,
 310                                 usb_rcvctrlpipe(kaweth->dev, 0),
 311                                 KAWETH_COMMAND_GET_ETHERNET_DESC,
 312                                 USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
 313                                 0,
 314                                 0,
 315                                 (void *)&kaweth->configuration,
 316                                 sizeof(kaweth->configuration),
 317                                 KAWETH_CONTROL_TIMEOUT);
 318
 319         return retval;
 320 }
 321
 322 /****************************************************************
 323  *     kaweth_set_urb_size
 324  ****************************************************************/
 325 static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
 326 {
 327         int retval;
 328
 329         dbg("Setting URB size to %d", (unsigned)urb_size);
 330
 331         retval = kaweth_control(kaweth,
 332                                 usb_sndctrlpipe(kaweth->dev, 0),
 333                                 KAWETH_COMMAND_SET_URB_SIZE,
 334                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 335                                 urb_size,
 336                                 0,
 337                                 (void *)&kaweth->scratch,
 338                                 0,
 339                                 KAWETH_CONTROL_TIMEOUT);
 340
 341         return retval;
 342 }
 343
 344 /****************************************************************
 345  *     kaweth_set_sofs_wait
 346  ****************************************************************/
 347 static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
 348 {
 349         int retval;
 350
 351         dbg("Set SOFS wait to %d", (unsigned)sofs_wait);
 352
 353         retval = kaweth_control(kaweth,
 354                                 usb_sndctrlpipe(kaweth->dev, 0),
 355                                 KAWETH_COMMAND_SET_SOFS_WAIT,
 356                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 357                                 sofs_wait,
 358                                 0,
 359                                 (void *)&kaweth->scratch,
 360                                 0,
 361                                 KAWETH_CONTROL_TIMEOUT);
 362
 363         return retval;
 364 }
 365
 366 /****************************************************************
 367  *     kaweth_set_receive_filter
 368  ****************************************************************/
 369 static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
 370                                      __u16 receive_filter)
 371 {
 372         int retval;
 373
 374         dbg("Set receive filter to %d", (unsigned)receive_filter);
 375
 376         retval = kaweth_control(kaweth,
 377                                 usb_sndctrlpipe(kaweth->dev, 0),
 378                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 379                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 380                                 receive_filter,
 381                                 0,
 382                                 (void *)&kaweth->scratch,
 383                                 0,
 384                                 KAWETH_CONTROL_TIMEOUT);
 385
 386         return retval;
 387 }
 388
 389 /****************************************************************
 390  *     kaweth_download_firmware
 391  ****************************************************************/
 392 static int kaweth_download_firmware(struct kaweth_device *kaweth,
 393                                     const char *fwname,
 394                                     __u8 interrupt,
 395                                     __u8 type)
 396 {
 397         const struct firmware *fw;
 398         int data_len;
 399         int ret;
 400
 401         ret = request_firmware(&fw, fwname, &kaweth->dev->dev);
 402         if (ret) {
 403                 err("Firmware request failed\n");
 404                 return ret;
 405         }
 406
 407         if (fw->size > KAWETH_FIRMWARE_BUF_SIZE) {
 408                 err("Firmware too big: %zu", fw->size);
 409                 return -ENOSPC;
 410         }
 411         data_len = fw->size;
 412         memcpy(kaweth->firmware_buf, fw->data, fw->size);
 413
 414         release_firmware(fw);
 415
 416         kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
 417         kaweth->firmware_buf[3] = data_len >> 8;
 418         kaweth->firmware_buf[4] = type;
 419         kaweth->firmware_buf[5] = interrupt;
 420
 421         dbg("High: %i, Low:%i", kaweth->firmware_buf[3],
 422                    kaweth->firmware_buf[2]);
 423
 424         dbg("Downloading firmware at %p to kaweth device at %p",
 425             fw->data, kaweth);
 426         dbg("Firmware length: %d", data_len);
 427
 428         return kaweth_control(kaweth,
 429                               usb_sndctrlpipe(kaweth->dev, 0),
 430                               KAWETH_COMMAND_SCAN,
 431                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 432                               0,
 433                               0,
 434                               (void *)kaweth->firmware_buf,
 435                               data_len,
 436                               KAWETH_CONTROL_TIMEOUT);
 437 }
 438
 439 /****************************************************************
 440  *     kaweth_trigger_firmware
 441  ****************************************************************/
 442 static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
 443                                    __u8 interrupt)
 444 {
 445         kaweth->firmware_buf[0] = 0xB6;
 446         kaweth->firmware_buf[1] = 0xC3;
 447         kaweth->firmware_buf[2] = 0x01;
 448         kaweth->firmware_buf[3] = 0x00;
 449         kaweth->firmware_buf[4] = 0x06;
 450         kaweth->firmware_buf[5] = interrupt;
 451         kaweth->firmware_buf[6] = 0x00;
 452         kaweth->firmware_buf[7] = 0x00;
 453
 454         dbg("Triggering firmware");
 455
 456         return kaweth_control(kaweth,
 457                               usb_sndctrlpipe(kaweth->dev, 0),
 458                               KAWETH_COMMAND_SCAN,
 459                               USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 460                               0,
 461                               0,
 462                               (void *)kaweth->firmware_buf,
 463                               8,
 464                               KAWETH_CONTROL_TIMEOUT);
 465 }
 466
 467 /****************************************************************
 468  *     kaweth_reset
 469  ****************************************************************/
 470 static int kaweth_reset(struct kaweth_device *kaweth)
 471 {
 472         int result;
 473
 474         dbg("kaweth_reset(%p)", kaweth);
 475         result = usb_reset_configuration(kaweth->dev);
 476         mdelay(10);
 477
 478         dbg("kaweth_reset() returns %d.",result);
 479
 480         return result;
 481 }
 482
 483 static void kaweth_usb_receive(struct urb *);
 484 static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);
 485
 486 /****************************************************************
 487         int_callback
 488 *****************************************************************/
 489
 490 static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
 491 {
 492         int status;
 493
 494         status = usb_submit_urb (kaweth->irq_urb, mf);
 495         if (unlikely(status == -ENOMEM)) {
 496                 kaweth->suspend_lowmem_ctrl = 1;
 497                 schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 498         } else {
 499                 kaweth->suspend_lowmem_ctrl = 0;
 500         }
 501
 502         if (status)
 503                 err ("can't resubmit intr, %s-%s, status %d",
 504                                 kaweth->dev->bus->bus_name,
 505                                 kaweth->dev->devpath, status);
 506 }
 507
 508 static void int_callback(struct urb *u)
 509 {
 510         struct kaweth_device *kaweth = u->context;
 511         int act_state;
 512         int status = u->status;
 513
 514         switch (status) {
 515         case 0:                 /* success */
 516                 break;
 517         case -ECONNRESET:       /* unlink */
 518         case -ENOENT:
 519         case -ESHUTDOWN:
 520                 return;
 521         /* -EPIPE:  should clear the halt */
 522         default:                /* error */
 523                 goto resubmit;
 524         }
 525
 526         /* we check the link state to report changes */
 527         if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
 528                 if (act_state)
 529                         netif_carrier_on(kaweth->net);
 530                 else
 531                         netif_carrier_off(kaweth->net);
 532
 533                 kaweth->linkstate = act_state;
 534         }
 535 resubmit:
 536         kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
 537 }
 538
 539 static void kaweth_resubmit_tl(struct work_struct *work)
 540 {
 541         struct kaweth_device *kaweth =
 542                 container_of(work, struct kaweth_device, lowmem_work.work);
 543
 544         if (IS_BLOCKED(kaweth->status))
 545                 return;
 546
 547         if (kaweth->suspend_lowmem_rx)
 548                 kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 549
 550         if (kaweth->suspend_lowmem_ctrl)
 551                 kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 552 }
 553
 554
 555 /****************************************************************
 556  *     kaweth_resubmit_rx_urb
 557  ****************************************************************/
 558 static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
 559                                                 gfp_t mem_flags)
 560 {
 561         int result;
 562
 563         usb_fill_bulk_urb(kaweth->rx_urb,
 564                       kaweth->dev,
 565                       usb_rcvbulkpipe(kaweth->dev, 1),
 566                       kaweth->rx_buf,
 567                       KAWETH_BUF_SIZE,
 568                       kaweth_usb_receive,
 569                       kaweth);
 570         kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 571         kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;
 572
 573         if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
 574                 if (result == -ENOMEM) {
 575                         kaweth->suspend_lowmem_rx = 1;
 576                         schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
 577                 }
 578                 err("resubmitting rx_urb %d failed", result);
 579         } else {
 580                 kaweth->suspend_lowmem_rx = 0;
 581         }
 582
 583         return result;
 584 }
 585
 586 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);
 587
 588 /****************************************************************
 589  *     kaweth_usb_receive
 590  ****************************************************************/
 591 static void kaweth_usb_receive(struct urb *urb)
 592 {
 593         struct kaweth_device *kaweth = urb->context;
 594         struct net_device *net = kaweth->net;
 595         int status = urb->status;
 596
 597         int count = urb->actual_length;
 598         int count2 = urb->transfer_buffer_length;
 599
 600         __u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);
 601
 602         struct sk_buff *skb;
 603
 604         if (unlikely(status == -EPIPE)) {
 605                 kaweth->stats.rx_errors++;
 606                 kaweth->end = 1;
 607                 wake_up(&kaweth->term_wait);
 608                 dbg("Status was -EPIPE.");
 609                 return;
 610         }
 611         if (unlikely(status == -ECONNRESET || status == -ESHUTDOWN)) {
 612                 /* we are killed - set a flag and wake the disconnect handler */
 613                 kaweth->end = 1;
 614                 wake_up(&kaweth->term_wait);
 615                 dbg("Status was -ECONNRESET or -ESHUTDOWN.");
 616                 return;
 617         }
 618         if (unlikely(status == -EPROTO || status == -ETIME ||
 619                      status == -EILSEQ)) {
 620                 kaweth->stats.rx_errors++;
 621                 dbg("Status was -EPROTO, -ETIME, or -EILSEQ.");
 622                 return;
 623         }
 624         if (unlikely(status == -EOVERFLOW)) {
 625                 kaweth->stats.rx_errors++;
 626                 dbg("Status was -EOVERFLOW.");
 627         }
 628         spin_lock(&kaweth->device_lock);
 629         if (IS_BLOCKED(kaweth->status)) {
 630                 spin_unlock(&kaweth->device_lock);
 631                 return;
 632         }
 633         spin_unlock(&kaweth->device_lock);
 634
 635         if(status && status != -EREMOTEIO && count != 1) {
 636                 err("%s RX status: %d count: %d packet_len: %d",
 637                            net->name,
 638                            status,
 639                            count,
 640                            (int)pkt_len);
 641                 kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 642                 return;
 643         }
 644
 645         if(kaweth->net && (count > 2)) {
 646                 if(pkt_len > (count - 2)) {
 647                         err("Packet length too long for USB frame (pkt_len: %x, count: %x)",pkt_len, count);
 648                         err("Packet len & 2047: %x", pkt_len & 2047);
 649                         err("Count 2: %x", count2);
 650                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 651                         return;
 652                 }
 653
 654                 if(!(skb = dev_alloc_skb(pkt_len+2))) {
 655                         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 656                         return;
 657                 }
 658
 659                 skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
 660
 661                 skb_copy_to_linear_data(skb, kaweth->rx_buf + 2, pkt_len);
 662
 663                 skb_put(skb, pkt_len);
 664
 665                 skb->protocol = eth_type_trans(skb, net);
 666
 667                 netif_rx(skb);
 668
 669                 kaweth->stats.rx_packets++;
 670                 kaweth->stats.rx_bytes += pkt_len;
 671         }
 672
 673         kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
 674 }
 675
 676 /****************************************************************
 677  *     kaweth_open
 678  ****************************************************************/
 679 static int kaweth_open(struct net_device *net)
 680 {
 681         struct kaweth_device *kaweth = netdev_priv(net);
 682         int res;
 683
 684         dbg("Opening network device.");
 685
 686         res = usb_autopm_get_interface(kaweth->intf);
 687         if (res) {
 688                 err("Interface cannot be resumed.");
 689                 return -EIO;
 690         }
 691         res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
 692         if (res)
 693                 goto err_out;
 694
 695         usb_fill_int_urb(
 696                 kaweth->irq_urb,
 697                 kaweth->dev,
 698                 usb_rcvintpipe(kaweth->dev, 3),
 699                 kaweth->intbuffer,
 700                 INTBUFFERSIZE,
 701                 int_callback,
 702                 kaweth,
 703                 250); /* overriding the descriptor */
 704         kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
 705         kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 706
 707         res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
 708         if (res) {
 709                 usb_kill_urb(kaweth->rx_urb);
 710                 goto err_out;
 711         }
 712         kaweth->opened = 1;
 713
 714         netif_start_queue(net);
 715
 716         kaweth_async_set_rx_mode(kaweth);
 717         return 0;
 718
 719 err_out:
 720         usb_autopm_put_interface(kaweth->intf);
 721         return -EIO;
 722 }
 723
 724 /****************************************************************
 725  *     kaweth_kill_urbs
 726  ****************************************************************/
 727 static void kaweth_kill_urbs(struct kaweth_device *kaweth)
 728 {
 729         usb_kill_urb(kaweth->irq_urb);
 730         usb_kill_urb(kaweth->rx_urb);
 731         usb_kill_urb(kaweth->tx_urb);
 732
 733         cancel_delayed_work_sync(&kaweth->lowmem_work);
 734
 735         /* a scheduled work may have resubmitted,
 736            we hit them again */
 737         usb_kill_urb(kaweth->irq_urb);
 738         usb_kill_urb(kaweth->rx_urb);
 739 }
 740
 741 /****************************************************************
 742  *     kaweth_close
 743  ****************************************************************/
 744 static int kaweth_close(struct net_device *net)
 745 {
 746         struct kaweth_device *kaweth = netdev_priv(net);
 747
 748         netif_stop_queue(net);
 749         kaweth->opened = 0;
 750
 751         kaweth->status |= KAWETH_STATUS_CLOSING;
 752
 753         kaweth_kill_urbs(kaweth);
 754
 755         kaweth->status &= ~KAWETH_STATUS_CLOSING;
 756
 757         usb_autopm_put_interface(kaweth->intf);
 758
 759         return 0;
 760 }
 761
 762 static u32 kaweth_get_link(struct net_device *dev)
 763 {
 764         struct kaweth_device *kaweth = netdev_priv(dev);
 765
 766         return kaweth->linkstate;
 767 }
 768
 769 static const struct ethtool_ops ops = {
 770         .get_link       = kaweth_get_link
 771 };
 772
 773 /****************************************************************
 774  *     kaweth_usb_transmit_complete
 775  ****************************************************************/
 776 static void kaweth_usb_transmit_complete(struct urb *urb)
 777 {
 778         struct kaweth_device *kaweth = urb->context;
 779         struct sk_buff *skb = kaweth->tx_skb;
 780         int status = urb->status;
 781
 782         if (unlikely(status != 0))
 783                 if (status != -ENOENT)
 784                         dbg("%s: TX status %d.", kaweth->net->name, status);
 785
 786         netif_wake_queue(kaweth->net);
 787         dev_kfree_skb_irq(skb);
 788 }
 789
 790 /****************************************************************
 791  *     kaweth_start_xmit
 792  ****************************************************************/
 793 static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
 794                                            struct net_device *net)
 795 {
 796         struct kaweth_device *kaweth = netdev_priv(net);
 797         __le16 *private_header;
 798
 799         int res;
 800
 801         spin_lock_irq(&kaweth->device_lock);
 802
 803         kaweth_async_set_rx_mode(kaweth);
 804         netif_stop_queue(net);
 805         if (IS_BLOCKED(kaweth->status)) {
 806                 goto skip;
 807         }
 808
 809         /* We now decide whether we can put our special header into the sk_buff */
 810         if (skb_cloned(skb) || skb_headroom(skb) < 2) {
 811                 /* no such luck - we make our own */
 812                 struct sk_buff *copied_skb;
 813                 copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
 814                 dev_kfree_skb_irq(skb);
 815                 skb = copied_skb;
 816                 if (!copied_skb) {
 817                         kaweth->stats.tx_errors++;
 818                         netif_start_queue(net);
 819                         spin_unlock_irq(&kaweth->device_lock);
 820                         return NETDEV_TX_OK;
 821                 }
 822         }
 823
 824         private_header = (__le16 *)__skb_push(skb, 2);
 825         *private_header = cpu_to_le16(skb->len-2);
 826         kaweth->tx_skb = skb;
 827
 828         usb_fill_bulk_urb(kaweth->tx_urb,
 829                       kaweth->dev,
 830                       usb_sndbulkpipe(kaweth->dev, 2),
 831                       private_header,
 832                       skb->len,
 833                       kaweth_usb_transmit_complete,
 834                       kaweth);
 835         kaweth->end = 0;
 836
 837         if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
 838         {
 839                 dev_warn(&net->dev, "kaweth failed tx_urb %d\n", res);
 840 skip:
 841                 kaweth->stats.tx_errors++;
 842
 843                 netif_start_queue(net);
 844                 dev_kfree_skb_irq(skb);
 845         }
 846         else
 847         {
 848                 kaweth->stats.tx_packets++;
 849                 kaweth->stats.tx_bytes += skb->len;
 850         }
 851
 852         spin_unlock_irq(&kaweth->device_lock);
 853
 854         return NETDEV_TX_OK;
 855 }
 856
 857 /****************************************************************
 858  *     kaweth_set_rx_mode
 859  ****************************************************************/
 860 static void kaweth_set_rx_mode(struct net_device *net)
 861 {
 862         struct kaweth_device *kaweth = netdev_priv(net);
 863
 864         __u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
 865                                      KAWETH_PACKET_FILTER_BROADCAST |
 866                                      KAWETH_PACKET_FILTER_MULTICAST;
 867
 868         dbg("Setting Rx mode to %d", packet_filter_bitmap);
 869
 870         netif_stop_queue(net);
 871
 872         if (net->flags & IFF_PROMISC) {
 873                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
 874         }
 875         else if (!netdev_mc_empty(net) || (net->flags & IFF_ALLMULTI)) {
 876                 packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
 877         }
 878
 879         kaweth->packet_filter_bitmap = packet_filter_bitmap;
 880         netif_wake_queue(net);
 881 }
 882
 883 /****************************************************************
 884  *     kaweth_async_set_rx_mode
 885  ****************************************************************/
 886 static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
 887 {
 888         int result;
 889         __u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
 890
 891         kaweth->packet_filter_bitmap = 0;
 892         if (packet_filter_bitmap == 0)
 893                 return;
 894
 895         if (in_interrupt())
 896                 return;
 897
 898         result = kaweth_control(kaweth,
 899                                 usb_sndctrlpipe(kaweth->dev, 0),
 900                                 KAWETH_COMMAND_SET_PACKET_FILTER,
 901                                 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
 902                                 packet_filter_bitmap,
 903                                 0,
 904                                 (void *)&kaweth->scratch,
 905                                 0,
 906                                 KAWETH_CONTROL_TIMEOUT);
 907
 908         if(result < 0) {
 909                 err("Failed to set Rx mode: %d", result);
 910         }
 911         else {
 912                 dbg("Set Rx mode to %d", packet_filter_bitmap);
 913         }
 914 }
 915
 916 /****************************************************************
 917  *     kaweth_netdev_stats
 918  ****************************************************************/
 919 static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
 920 {
 921         struct kaweth_device *kaweth = netdev_priv(dev);
 922         return &kaweth->stats;
 923 }
 924
 925 /****************************************************************
 926  *     kaweth_tx_timeout
 927  ****************************************************************/
 928 static void kaweth_tx_timeout(struct net_device *net)
 929 {
 930         struct kaweth_device *kaweth = netdev_priv(net);
 931
 932         dev_warn(&net->dev, "%s: Tx timed out. Resetting.\n", net->name);
 933         kaweth->stats.tx_errors++;
 934         net->trans_start = jiffies;
 935
 936         usb_unlink_urb(kaweth->tx_urb);
 937 }
 938
 939 /****************************************************************
 940  *     kaweth_suspend
 941  ****************************************************************/
 942 static int kaweth_suspend(struct usb_interface *intf, pm_message_t message)
 943 {
 944         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 945         unsigned long flags;
 946
 947         dbg("Suspending device");
 948         spin_lock_irqsave(&kaweth->device_lock, flags);
 949         kaweth->status |= KAWETH_STATUS_SUSPENDING;
 950         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 951
 952         kaweth_kill_urbs(kaweth);
 953         return 0;
 954 }
 955
 956 /****************************************************************
 957  *     kaweth_resume
 958  ****************************************************************/
 959 static int kaweth_resume(struct usb_interface *intf)
 960 {
 961         struct kaweth_device *kaweth = usb_get_intfdata(intf);
 962         unsigned long flags;
 963
 964         dbg("Resuming device");
 965         spin_lock_irqsave(&kaweth->device_lock, flags);
 966         kaweth->status &= ~KAWETH_STATUS_SUSPENDING;
 967         spin_unlock_irqrestore(&kaweth->device_lock, flags);
 968
 969         if (!kaweth->opened)
 970                 return 0;
 971         kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);
 972         kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
 973
 974         return 0;
 975 }
 976
 977 /****************************************************************
 978  *     kaweth_probe
 979  ****************************************************************/
 980
 981
 982 static const struct net_device_ops kaweth_netdev_ops = {
 983         .ndo_open =                     kaweth_open,
 984         .ndo_stop =                     kaweth_close,
 985         .ndo_start_xmit =               kaweth_start_xmit,
 986         .ndo_tx_timeout =               kaweth_tx_timeout,
 987         .ndo_set_multicast_list =       kaweth_set_rx_mode,
 988         .ndo_get_stats =                kaweth_netdev_stats,
 989         .ndo_change_mtu =               eth_change_mtu,
 990         .ndo_set_mac_address =          eth_mac_addr,
 991         .ndo_validate_addr =            eth_validate_addr,
 992 };
 993
 994 static int kaweth_probe(
 995                 struct usb_interface *intf,
 996                 const struct usb_device_id *id      /* from id_table */
 997         )
 998 {
 999         struct usb_device *dev = interface_to_usbdev(intf);
1000         struct kaweth_device *kaweth;
1001         struct net_device *netdev;
1002         const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
1003         int result = 0;
1004
1005         dbg("Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x",
1006                  dev->devnum,
1007                  le16_to_cpu(dev->descriptor.idVendor),
1008                  le16_to_cpu(dev->descriptor.idProduct),
1009                  le16_to_cpu(dev->descriptor.bcdDevice));
1010
1011         dbg("Device at %p", dev);
1012
1013         dbg("Descriptor length: %x type: %x",
1014                  (int)dev->descriptor.bLength,
1015                  (int)dev->descriptor.bDescriptorType);
1016
1017         netdev = alloc_etherdev(sizeof(*kaweth));
1018         if (!netdev)
1019                 return -ENOMEM;
1020
1021         kaweth = netdev_priv(netdev);
1022         kaweth->dev = dev;
1023         kaweth->net = netdev;
1024
1025         spin_lock_init(&kaweth->device_lock);
1026         init_waitqueue_head(&kaweth->term_wait);
1027
1028         dbg("Resetting.");
1029
1030         kaweth_reset(kaweth);
1031
1032         /*
1033          * If high byte of bcdDevice is nonzero, firmware is already
1034          * downloaded. Don't try to do it again, or we'll hang the device.
1035          */
1036
1037         if (le16_to_cpu(dev->descriptor.bcdDevice) >> 8) {
1038                 dev_info(&intf->dev, "Firmware present in device.\n");
1039         } else {
1040                 /* Download the firmware */
1041                 dev_info(&intf->dev, "Downloading firmware...\n");
1042                 kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
1043                 if ((result = kaweth_download_firmware(kaweth,
1044                                                       "kaweth/new_code.bin",
1045                                                       100,
1046                                                       2)) < 0) {
1047                         err("Error downloading firmware (%d)", result);
1048                         goto err_fw;
1049                 }
1050
1051                 if ((result = kaweth_download_firmware(kaweth,
1052                                                       "kaweth/new_code_fix.bin",
1053                                                       100,
1054                                                       3)) < 0) {
1055                         err("Error downloading firmware fix (%d)", result);
1056                         goto err_fw;
1057                 }
1058
1059                 if ((result = kaweth_download_firmware(kaweth,
1060                                                       "kaweth/trigger_code.bin",
1061                                                       126,
1062                                                       2)) < 0) {
1063                         err("Error downloading trigger code (%d)", result);
1064                         goto err_fw;
1065
1066                 }
1067
1068                 if ((result = kaweth_download_firmware(kaweth,
1069                                                       "kaweth/trigger_code_fix.bin",
1070                                                       126,
1071                                                       3)) < 0) {
1072                         err("Error downloading trigger code fix (%d)", result);
1073                         goto err_fw;
1074                 }
1075
1076
1077                 if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
1078                         err("Error triggering firmware (%d)", result);
1079                         goto err_fw;
1080                 }
1081
1082                 /* Device will now disappear for a moment...  */
1083                 dev_info(&intf->dev, "Firmware loaded.  I'll be back...\n");
1084 err_fw:
1085                 free_page((unsigned long)kaweth->firmware_buf);
1086                 free_netdev(netdev);
1087                 return -EIO;
1088         }
1089
1090         result = kaweth_read_configuration(kaweth);
1091
1092         if(result < 0) {
1093                 err("Error reading configuration (%d), no net device created", result);
1094                 goto err_free_netdev;
1095         }
1096
1097         dev_info(&intf->dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
1098         dev_info(&intf->dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
1099         dev_info(&intf->dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
1100         dev_info(&intf->dev, "Read MAC address %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n",
1101                  (int)kaweth->configuration.hw_addr[0],
1102                  (int)kaweth->configuration.hw_addr[1],
1103                  (int)kaweth->configuration.hw_addr[2],
1104                  (int)kaweth->configuration.hw_addr[3],
1105                  (int)kaweth->configuration.hw_addr[4],
1106                  (int)kaweth->configuration.hw_addr[5]);
1107
1108         if(!memcmp(&kaweth->configuration.hw_addr,
1109                    &bcast_addr,
1110                    sizeof(bcast_addr))) {
1111                 err("Firmware not functioning properly, no net device created");
1112                 goto err_free_netdev;
1113         }
1114
1115         if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
1116                 dbg("Error setting URB size");
1117                 goto err_free_netdev;
1118         }
1119
1120         if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
1121                 err("Error setting SOFS wait");
1122                 goto err_free_netdev;
1123         }
1124
1125         result = kaweth_set_receive_filter(kaweth,
1126                                            KAWETH_PACKET_FILTER_DIRECTED |
1127                                            KAWETH_PACKET_FILTER_BROADCAST |
1128                                            KAWETH_PACKET_FILTER_MULTICAST);
1129
1130         if(result < 0) {
1131                 err("Error setting receive filter");
1132                 goto err_free_netdev;
1133         }
1134
1135         dbg("Initializing net device.");
1136
1137         kaweth->intf = intf;
1138
1139         kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
1140         if (!kaweth->tx_urb)
1141                 goto err_free_netdev;
1142         kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
1143         if (!kaweth->rx_urb)
1144                 goto err_only_tx;
1145         kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
1146         if (!kaweth->irq_urb)
1147                 goto err_tx_and_rx;
1148
1149         kaweth->intbuffer = usb_alloc_coherent( kaweth->dev,
1150                                                 INTBUFFERSIZE,
1151                                                 GFP_KERNEL,
1152                                                 &kaweth->intbufferhandle);
1153         if (!kaweth->intbuffer)
1154                 goto err_tx_and_rx_and_irq;
1155         kaweth->rx_buf = usb_alloc_coherent(    kaweth->dev,
1156                                                 KAWETH_BUF_SIZE,
1157                                                 GFP_KERNEL,
1158                                                 &kaweth->rxbufferhandle);
1159         if (!kaweth->rx_buf)
1160                 goto err_all_but_rxbuf;
1161
1162         memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
1163         memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
1164                sizeof(kaweth->configuration.hw_addr));
1165
1166         netdev->netdev_ops = &kaweth_netdev_ops;
1167         netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
1168         netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
1169         SET_ETHTOOL_OPS(netdev, &ops);
1170
1171         /* kaweth is zeroed as part of alloc_netdev */
1172         INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
1173         usb_set_intfdata(intf, kaweth);
1174
1175 #if 0
1176 // dma_supported() is deeply broken on almost all architectures
1177         if (dma_supported (&intf->dev, 0xffffffffffffffffULL))
1178                 kaweth->net->features |= NETIF_F_HIGHDMA;
1179 #endif
1180
1181         SET_NETDEV_DEV(netdev, &intf->dev);
1182         if (register_netdev(netdev) != 0) {
1183                 err("Error registering netdev.");
1184                 goto err_intfdata;
1185         }
1186
1187         dev_info(&intf->dev, "kaweth interface created at %s\n",
1188                  kaweth->net->name);
1189
1190         dbg("Kaweth probe returning.");
1191
1192         return 0;
1193
1194 err_intfdata:
1195         usb_set_intfdata(intf, NULL);
1196         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1197 err_all_but_rxbuf:
1198         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1199 err_tx_and_rx_and_irq:
1200         usb_free_urb(kaweth->irq_urb);
1201 err_tx_and_rx:
1202         usb_free_urb(kaweth->rx_urb);
1203 err_only_tx:
1204         usb_free_urb(kaweth->tx_urb);
1205 err_free_netdev:
1206         free_netdev(netdev);
1207
1208         return -EIO;
1209 }
1210
1211 /****************************************************************
1212  *     kaweth_disconnect
1213  ****************************************************************/
1214 static void kaweth_disconnect(struct usb_interface *intf)
1215 {
1216         struct kaweth_device *kaweth = usb_get_intfdata(intf);
1217         struct net_device *netdev;
1218
1219         dev_info(&intf->dev, "Unregistering\n");
1220
1221         usb_set_intfdata(intf, NULL);
1222         if (!kaweth) {
1223                 dev_warn(&intf->dev, "unregistering non-existant device\n");
1224                 return;
1225         }
1226         netdev = kaweth->net;
1227
1228         dbg("Unregistering net device");
1229         unregister_netdev(netdev);
1230
1231         usb_free_urb(kaweth->rx_urb);
1232         usb_free_urb(kaweth->tx_urb);
1233         usb_free_urb(kaweth->irq_urb);
1234
1235         usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
1236         usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
1237
1238         free_netdev(netdev);
1239 }
1240
1241
1242 // FIXME this completion stuff is a modified clone of
1243 // an OLD version of some stuff in usb.c ...
1244 struct usb_api_data {
1245         wait_queue_head_t wqh;
1246         int done;
1247 };
1248
1249 /*-------------------------------------------------------------------*
1250  * completion handler for compatibility wrappers (sync control/bulk) *
1251  *-------------------------------------------------------------------*/
1252 static void usb_api_blocking_completion(struct urb *urb)
1253 {
1254         struct usb_api_data *awd = (struct usb_api_data *)urb->context;
1255
1256         awd->done=1;
1257         wake_up(&awd->wqh);
1258 }
1259
1260 /*-------------------------------------------------------------------*
1261  *                         COMPATIBILITY STUFF                       *
1262  *-------------------------------------------------------------------*/
1263
1264 // Starts urb and waits for completion or timeout
1265 static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
1266 {
1267         struct usb_api_data awd;
1268         int status;
1269
1270         init_waitqueue_head(&awd.wqh);
1271         awd.done = 0;
1272
1273         urb->context = &awd;
1274         status = usb_submit_urb(urb, GFP_NOIO);
1275         if (status) {
1276                 // something went wrong
1277                 usb_free_urb(urb);
1278                 return status;
1279         }
1280
1281         if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
1282                 // timeout
1283                 dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
1284                 usb_kill_urb(urb);  // remove urb safely
1285                 status = -ETIMEDOUT;
1286         }
1287         else {
1288                 status = urb->status;
1289         }
1290
1291         if (actual_length) {
1292                 *actual_length = urb->actual_length;
1293         }
1294
1295         usb_free_urb(urb);
1296         return status;
1297 }
1298
1299 /*-------------------------------------------------------------------*/
1300 // returns status (negative) or length (positive)
1301 static int kaweth_internal_control_msg(struct usb_device *usb_dev,
1302                                        unsigned int pipe,
1303                                        struct usb_ctrlrequest *cmd, void *data,
1304                                        int len, int timeout)
1305 {
1306         struct urb *urb;
1307         int retv;
1308         int length = 0; /* shut up GCC */
1309
1310         urb = usb_alloc_urb(0, GFP_NOIO);
1311         if (!urb)
1312                 return -ENOMEM;
1313
1314         usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
1315                          len, usb_api_blocking_completion, NULL);
1316
1317         retv = usb_start_wait_urb(urb, timeout, &length);
1318         if (retv < 0) {
1319                 return retv;
1320         }
1321         else {
1322                 return length;
1323         }
1324 }
1325
1326
1327 /****************************************************************
1328  *     kaweth_init
1329  ****************************************************************/
1330 static int __init kaweth_init(void)
1331 {
1332         dbg("Driver loading");
1333         return usb_register(&kaweth_driver);
1334 }
1335
1336 /****************************************************************
1337  *     kaweth_exit
1338  ****************************************************************/
1339 static void __exit kaweth_exit(void)
1340 {
1341         usb_deregister(&kaweth_driver);
1342 }
1343
1344 module_init(kaweth_init);
1345 module_exit(kaweth_exit);
1346
1347
1348
1349
1350
1351
1352
1353
1354