Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
/****************************************************************
 *
 *     kaweth.c - driver for KL5KUSB101 based USB->Ethernet
 *
 *     (c) 2000 Interlan Communications
 *     (c) 2000 Stephane Alnet
 *     (C) 2001 Brad Hards
 *     (C) 2002 Oliver Neukum
 *
 *     Original author: The Zapman <zapman@interlan.net>
 *     Inspired by, and much credit goes to Michael Rothwell
 *     <rothwell@interlan.net> for the test equipment, help, and patience
 *     Based off of (and with thanks to) Petko Manolov's pegaus.c driver.
 *     Also many thanks to Joel Silverman and Ed Surprenant at Kawasaki
 *     for providing the firmware and driver resources.
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program; if not, write to the Free Software Foundation,
 *     Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 ****************************************************************/

/* TODO:
 * Fix in_interrupt() problem
 * Develop test procedures for USB net interfaces
 * Run test procedures
 * Fix bugs from previous two steps
 * Snoop other OSs for any tricks we're not doing
 * SMP locking
 * Reduce arbitrary timeouts
 * Smart multicast support
 * Temporary MAC change support
 * Tunable SOFs parameter - ioctl()?
 * Ethernet stats collection
 * Code formatting improvements
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/usb.h>
#include <linux/types.h>
#include <linux/ethtool.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/wait.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/byteorder.h>

#undef DEBUG

#ifdef DEBUG
#define kaweth_dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" ,##arg)
#else
#define kaweth_dbg(format, arg...) do {} while (0)
#endif
#define kaweth_err(format, arg...) printk(KERN_ERR __FILE__ ": " format "\n" ,##arg)
#define kaweth_info(format, arg...) printk(KERN_INFO __FILE__ ": " format "\n" , ##arg)
#define kaweth_warn(format, arg...) printk(KERN_WARNING __FILE__ ": " format "\n" , ##arg)


#include "kawethfw.h"

#define KAWETH_MTU			1514
#define KAWETH_BUF_SIZE			1664
#define KAWETH_TX_TIMEOUT		(5 * HZ)
#define KAWETH_SCRATCH_SIZE		32
#define KAWETH_FIRMWARE_BUF_SIZE	4096
#define KAWETH_CONTROL_TIMEOUT		(30 * HZ)

#define KAWETH_STATUS_BROKEN		0x0000001
#define KAWETH_STATUS_CLOSING		0x0000002

#define KAWETH_PACKET_FILTER_PROMISCUOUS	0x01
#define KAWETH_PACKET_FILTER_ALL_MULTICAST	0x02
#define KAWETH_PACKET_FILTER_DIRECTED		0x04
#define KAWETH_PACKET_FILTER_BROADCAST		0x08
#define KAWETH_PACKET_FILTER_MULTICAST		0x10

/* Table 7 */
#define KAWETH_COMMAND_GET_ETHERNET_DESC	0x00
#define KAWETH_COMMAND_MULTICAST_FILTERS        0x01
#define KAWETH_COMMAND_SET_PACKET_FILTER	0x02
#define KAWETH_COMMAND_STATISTICS               0x03
#define KAWETH_COMMAND_SET_TEMP_MAC     	0x06
#define KAWETH_COMMAND_GET_TEMP_MAC             0x07
#define KAWETH_COMMAND_SET_URB_SIZE		0x08
#define KAWETH_COMMAND_SET_SOFS_WAIT		0x09
#define KAWETH_COMMAND_SCAN			0xFF

#define KAWETH_SOFS_TO_WAIT			0x05

#define INTBUFFERSIZE				4

#define STATE_OFFSET				0
#define STATE_MASK				0x40
#define	STATE_SHIFT				5


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>");
MODULE_DESCRIPTION("KL5USB101 USB Ethernet driver");
MODULE_LICENSE("GPL");

static const char driver_name[] = "kaweth";

static int kaweth_probe(
		struct usb_interface *intf,
		const struct usb_device_id *id	/* from id_table */
	);
static void kaweth_disconnect(struct usb_interface *intf);
static int kaweth_internal_control_msg(struct usb_device *usb_dev,
				       unsigned int pipe,
				       struct usb_ctrlrequest *cmd, void *data,
				       int len, int timeout);

/****************************************************************
 *     usb_device_id
 ****************************************************************/
static struct usb_device_id usb_klsi_table[] = {
	{ USB_DEVICE(0x03e8, 0x0008) }, /* AOX Endpoints USB Ethernet */
	{ USB_DEVICE(0x04bb, 0x0901) }, /* I-O DATA USB-ET/T */
	{ USB_DEVICE(0x0506, 0x03e8) }, /* 3Com 3C19250 */
	{ USB_DEVICE(0x0506, 0x11f8) }, /* 3Com 3C460 */
	{ USB_DEVICE(0x0557, 0x2002) }, /* ATEN USB Ethernet */
	{ USB_DEVICE(0x0557, 0x4000) }, /* D-Link DSB-650C */
	{ USB_DEVICE(0x0565, 0x0002) }, /* Peracom Enet */
	{ USB_DEVICE(0x0565, 0x0003) }, /* Optus@Home UEP1045A */
	{ USB_DEVICE(0x0565, 0x0005) }, /* Peracom Enet2 */
	{ USB_DEVICE(0x05e9, 0x0008) }, /* KLSI KL5KUSB101B */
	{ USB_DEVICE(0x05e9, 0x0009) }, /* KLSI KL5KUSB101B (Board change) */
	{ USB_DEVICE(0x066b, 0x2202) }, /* Linksys USB10T */
	{ USB_DEVICE(0x06e1, 0x0008) }, /* ADS USB-10BT */
	{ USB_DEVICE(0x06e1, 0x0009) }, /* ADS USB-10BT */
	{ USB_DEVICE(0x0707, 0x0100) }, /* SMC 2202USB */
	{ USB_DEVICE(0x07aa, 0x0001) }, /* Correga K.K. */
	{ USB_DEVICE(0x07b8, 0x4000) }, /* D-Link DU-E10 */
	{ USB_DEVICE(0x0846, 0x1001) }, /* NetGear EA-101 */
	{ USB_DEVICE(0x0846, 0x1002) }, /* NetGear EA-101 */
	{ USB_DEVICE(0x085a, 0x0008) }, /* PortGear Ethernet Adapter */
	{ USB_DEVICE(0x085a, 0x0009) }, /* PortGear Ethernet Adapter */
	{ USB_DEVICE(0x087d, 0x5704) }, /* Jaton USB Ethernet Device Adapter */
	{ USB_DEVICE(0x0951, 0x0008) }, /* Kingston Technology USB Ethernet Adapter */
	{ USB_DEVICE(0x095a, 0x3003) }, /* Portsmith Express Ethernet Adapter */
	{ USB_DEVICE(0x10bd, 0x1427) }, /* ASANTE USB To Ethernet Adapter */
	{ USB_DEVICE(0x1342, 0x0204) }, /* Mobility USB-Ethernet Adapter */
	{ USB_DEVICE(0x13d2, 0x0400) }, /* Shark Pocket Adapter */
	{ USB_DEVICE(0x1485, 0x0001) },	/* Silicom U2E */
	{ USB_DEVICE(0x1485, 0x0002) }, /* Psion Dacom Gold Port Ethernet */
	{ USB_DEVICE(0x1645, 0x0005) }, /* Entrega E45 */
	{ USB_DEVICE(0x1645, 0x0008) }, /* Entrega USB Ethernet Adapter */
	{ USB_DEVICE(0x1645, 0x8005) }, /* PortGear Ethernet Adapter */
	{ USB_DEVICE(0x2001, 0x4000) }, /* D-link DSB-650C */
	{} /* Null terminator */
};

MODULE_DEVICE_TABLE (usb, usb_klsi_table);

/****************************************************************
 *     kaweth_driver
 ****************************************************************/
static struct usb_driver kaweth_driver = {
	.owner =	THIS_MODULE,
	.name =		driver_name,
	.probe =	kaweth_probe,
	.disconnect =	kaweth_disconnect,
	.id_table =     usb_klsi_table,
};

typedef __u8 eth_addr_t[6];

/****************************************************************
 *     usb_eth_dev
 ****************************************************************/
struct usb_eth_dev {
	char *name;
	__u16 vendor;
	__u16 device;
	void *pdata;
};

/****************************************************************
 *     kaweth_ethernet_configuration
 *     Refer Table 8
 ****************************************************************/
struct kaweth_ethernet_configuration
{
	__u8 size;
	__u8 reserved1;
	__u8 reserved2;
	eth_addr_t hw_addr;
	__u32 statistics_mask;
	__le16 segment_size;
	__u16 max_multicast_filters;
	__u8 reserved3;
} __attribute__ ((packed));

/****************************************************************
 *     kaweth_device
 ****************************************************************/
struct kaweth_device
{
	spinlock_t device_lock;

	__u32 status;
	int end;
	int suspend_lowmem_rx;
	int suspend_lowmem_ctrl;
	int linkstate;
	struct work_struct lowmem_work;

	struct usb_device *dev;
	struct net_device *net;
	wait_queue_head_t term_wait;

	struct urb *rx_urb;
	struct urb *tx_urb;
	struct urb *irq_urb;

	dma_addr_t intbufferhandle;
	__u8 *intbuffer;
	dma_addr_t rxbufferhandle;
	__u8 *rx_buf;

	
	struct sk_buff *tx_skb;

	__u8 *firmware_buf;
	__u8 scratch[KAWETH_SCRATCH_SIZE];
	__u16 packet_filter_bitmap;

	struct kaweth_ethernet_configuration configuration;

	struct net_device_stats stats;
};


/****************************************************************
 *     kaweth_control
 ****************************************************************/
static int kaweth_control(struct kaweth_device *kaweth,
			  unsigned int pipe,
			  __u8 request,
			  __u8 requesttype,
			  __u16 value,
			  __u16 index,
			  void *data,
			  __u16 size,
			  int timeout)
{
	struct usb_ctrlrequest *dr;

	kaweth_dbg("kaweth_control()");

	if(in_interrupt()) {
		kaweth_dbg("in_interrupt()");
		return -EBUSY;
	}

	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);

	if (!dr) {
		kaweth_dbg("kmalloc() failed");
		return -ENOMEM;
	}

	dr->bRequestType= requesttype;
	dr->bRequest = request;
	dr->wValue = cpu_to_le16p(&value);
	dr->wIndex = cpu_to_le16p(&index);
	dr->wLength = cpu_to_le16p(&size);

	return kaweth_internal_control_msg(kaweth->dev,
					pipe,
					dr,
					data,
					size,
					timeout);
}

/****************************************************************
 *     kaweth_read_configuration
 ****************************************************************/
static int kaweth_read_configuration(struct kaweth_device *kaweth)
{
	int retval;

	kaweth_dbg("Reading kaweth configuration");

	retval = kaweth_control(kaweth,
				usb_rcvctrlpipe(kaweth->dev, 0),
				KAWETH_COMMAND_GET_ETHERNET_DESC,
				USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
				0,
				0,
				(void *)&kaweth->configuration,
				sizeof(kaweth->configuration),
				KAWETH_CONTROL_TIMEOUT);

	return retval;
}

/****************************************************************
 *     kaweth_set_urb_size
 ****************************************************************/
static int kaweth_set_urb_size(struct kaweth_device *kaweth, __u16 urb_size)
{
	int retval;

	kaweth_dbg("Setting URB size to %d", (unsigned)urb_size);

	retval = kaweth_control(kaweth,
				usb_sndctrlpipe(kaweth->dev, 0),
				KAWETH_COMMAND_SET_URB_SIZE,
				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
				urb_size,
				0,
				(void *)&kaweth->scratch,
				0,
				KAWETH_CONTROL_TIMEOUT);

	return retval;
}

/****************************************************************
 *     kaweth_set_sofs_wait
 ****************************************************************/
static int kaweth_set_sofs_wait(struct kaweth_device *kaweth, __u16 sofs_wait)
{
	int retval;

	kaweth_dbg("Set SOFS wait to %d", (unsigned)sofs_wait);

	retval = kaweth_control(kaweth,
				usb_sndctrlpipe(kaweth->dev, 0),
				KAWETH_COMMAND_SET_SOFS_WAIT,
				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
				sofs_wait,
				0,
				(void *)&kaweth->scratch,
				0,
				KAWETH_CONTROL_TIMEOUT);

	return retval;
}

/****************************************************************
 *     kaweth_set_receive_filter
 ****************************************************************/
static int kaweth_set_receive_filter(struct kaweth_device *kaweth,
				     __u16 receive_filter)
{
	int retval;

	kaweth_dbg("Set receive filter to %d", (unsigned)receive_filter);

	retval = kaweth_control(kaweth,
				usb_sndctrlpipe(kaweth->dev, 0),
				KAWETH_COMMAND_SET_PACKET_FILTER,
				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
				receive_filter,
				0,
				(void *)&kaweth->scratch,
				0,
				KAWETH_CONTROL_TIMEOUT);

	return retval;
}

/****************************************************************
 *     kaweth_download_firmware
 ****************************************************************/
static int kaweth_download_firmware(struct kaweth_device *kaweth,
				    __u8 *data,
				    __u16 data_len,
				    __u8 interrupt,
				    __u8 type)
{
	if(data_len > KAWETH_FIRMWARE_BUF_SIZE)	{
		kaweth_err("Firmware too big: %d", data_len);
		return -ENOSPC;
	}

	memcpy(kaweth->firmware_buf, data, data_len);

	kaweth->firmware_buf[2] = (data_len & 0xFF) - 7;
	kaweth->firmware_buf[3] = data_len >> 8;
	kaweth->firmware_buf[4] = type;
	kaweth->firmware_buf[5] = interrupt;

	kaweth_dbg("High: %i, Low:%i", kaweth->firmware_buf[3],
		   kaweth->firmware_buf[2]);

	kaweth_dbg("Downloading firmware at %p to kaweth device at %p",
	    data,
	    kaweth);
	kaweth_dbg("Firmware length: %d", data_len);

	return kaweth_control(kaweth,
		              usb_sndctrlpipe(kaweth->dev, 0),
			      KAWETH_COMMAND_SCAN,
			      USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
			      0,
			      0,
			      (void *)kaweth->firmware_buf,
			      data_len,
			      KAWETH_CONTROL_TIMEOUT);
}

/****************************************************************
 *     kaweth_trigger_firmware
 ****************************************************************/
static int kaweth_trigger_firmware(struct kaweth_device *kaweth,
				   __u8 interrupt)
{
	kaweth->firmware_buf[0] = 0xB6;
	kaweth->firmware_buf[1] = 0xC3;
	kaweth->firmware_buf[2] = 0x01;
	kaweth->firmware_buf[3] = 0x00;
	kaweth->firmware_buf[4] = 0x06;
	kaweth->firmware_buf[5] = interrupt;
	kaweth->firmware_buf[6] = 0x00;
	kaweth->firmware_buf[7] = 0x00;

	kaweth_dbg("Triggering firmware");

	return kaweth_control(kaweth,
			      usb_sndctrlpipe(kaweth->dev, 0),
			      KAWETH_COMMAND_SCAN,
			      USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
			      0,
			      0,
			      (void *)kaweth->firmware_buf,
			      8,
			      KAWETH_CONTROL_TIMEOUT);
}

/****************************************************************
 *     kaweth_reset
 ****************************************************************/
static int kaweth_reset(struct kaweth_device *kaweth)
{
	int result;

	kaweth_dbg("kaweth_reset(%p)", kaweth);
	result = kaweth_control(kaweth,
				usb_sndctrlpipe(kaweth->dev, 0),
				USB_REQ_SET_CONFIGURATION,
				0,
				kaweth->dev->config[0].desc.bConfigurationValue,
				0,
				NULL,
				0,
				KAWETH_CONTROL_TIMEOUT);

	mdelay(10);

	kaweth_dbg("kaweth_reset() returns %d.",result);

	return result;
}

static void kaweth_usb_receive(struct urb *, struct pt_regs *regs);
static int kaweth_resubmit_rx_urb(struct kaweth_device *, gfp_t);

/****************************************************************
	int_callback
*****************************************************************/

static void kaweth_resubmit_int_urb(struct kaweth_device *kaweth, gfp_t mf)
{
	int status;

	status = usb_submit_urb (kaweth->irq_urb, mf);
	if (unlikely(status == -ENOMEM)) {
		kaweth->suspend_lowmem_ctrl = 1;
		schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
	} else {
		kaweth->suspend_lowmem_ctrl = 0;
	}

	if (status)
		err ("can't resubmit intr, %s-%s, status %d",
				kaweth->dev->bus->bus_name,
				kaweth->dev->devpath, status);
}

static void int_callback(struct urb *u, struct pt_regs *regs)
{
	struct kaweth_device *kaweth = u->context;
	int act_state;

	switch (u->status) {
	case 0:			/* success */
		break;
	case -ECONNRESET:	/* unlink */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	/* -EPIPE:  should clear the halt */
	default:		/* error */
		goto resubmit;
	}

	/* we check the link state to report changes */
	if (kaweth->linkstate != (act_state = ( kaweth->intbuffer[STATE_OFFSET] | STATE_MASK) >> STATE_SHIFT)) {
		if (act_state)
			netif_carrier_on(kaweth->net);
		else
			netif_carrier_off(kaweth->net);

		kaweth->linkstate = act_state;
	}
resubmit:
	kaweth_resubmit_int_urb(kaweth, GFP_ATOMIC);
}

static void kaweth_resubmit_tl(void *d)
{
	struct kaweth_device *kaweth = (struct kaweth_device *)d;

	if (kaweth->status | KAWETH_STATUS_CLOSING)
		return;

	if (kaweth->suspend_lowmem_rx)
		kaweth_resubmit_rx_urb(kaweth, GFP_NOIO);

	if (kaweth->suspend_lowmem_ctrl)
		kaweth_resubmit_int_urb(kaweth, GFP_NOIO);
}


/****************************************************************
 *     kaweth_resubmit_rx_urb
 ****************************************************************/
static int kaweth_resubmit_rx_urb(struct kaweth_device *kaweth,
						gfp_t mem_flags)
{
	int result;

	usb_fill_bulk_urb(kaweth->rx_urb,
		      kaweth->dev,
		      usb_rcvbulkpipe(kaweth->dev, 1),
		      kaweth->rx_buf,
		      KAWETH_BUF_SIZE,
		      kaweth_usb_receive,
		      kaweth);
	kaweth->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	kaweth->rx_urb->transfer_dma = kaweth->rxbufferhandle;

	if((result = usb_submit_urb(kaweth->rx_urb, mem_flags))) {
		if (result == -ENOMEM) {
			kaweth->suspend_lowmem_rx = 1;
			schedule_delayed_work(&kaweth->lowmem_work, HZ/4);
		}
		kaweth_err("resubmitting rx_urb %d failed", result);
	} else {
		kaweth->suspend_lowmem_rx = 0;
	}

	return result;
}

static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth);

/****************************************************************
 *     kaweth_usb_receive
 ****************************************************************/
static void kaweth_usb_receive(struct urb *urb, struct pt_regs *regs)
{
	struct kaweth_device *kaweth = urb->context;
	struct net_device *net = kaweth->net;

	int count = urb->actual_length;
	int count2 = urb->transfer_buffer_length;

	__u16 pkt_len = le16_to_cpup((__le16 *)kaweth->rx_buf);

	struct sk_buff *skb;

	if(unlikely(urb->status == -ECONNRESET || urb->status == -ESHUTDOWN))
	/* we are killed - set a flag and wake the disconnect handler */
	{
		kaweth->end = 1;
		wake_up(&kaweth->term_wait);
		return;
	}

	if (kaweth->status & KAWETH_STATUS_CLOSING)
		return;

	if(urb->status && urb->status != -EREMOTEIO && count != 1) {
		kaweth_err("%s RX status: %d count: %d packet_len: %d",
                           net->name,
			   urb->status,
			   count,
			   (int)pkt_len);
		kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
                return;
	}

	if(kaweth->net && (count > 2)) {
		if(pkt_len > (count - 2)) {
			kaweth_err("Packet length too long for USB frame (pkt_len: %x, count: %x)",pkt_len, count);
			kaweth_err("Packet len & 2047: %x", pkt_len & 2047);
			kaweth_err("Count 2: %x", count2);
		        kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
                        return;
                }

		if(!(skb = dev_alloc_skb(pkt_len+2))) {
		        kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
                        return;
		}

		skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */

		skb->dev = net;

		eth_copy_and_sum(skb, kaweth->rx_buf + 2, pkt_len, 0);

		skb_put(skb, pkt_len);

		skb->protocol = eth_type_trans(skb, net);

		netif_rx(skb);

		kaweth->stats.rx_packets++;
		kaweth->stats.rx_bytes += pkt_len;
	}

	kaweth_resubmit_rx_urb(kaweth, GFP_ATOMIC);
}

/****************************************************************
 *     kaweth_open
 ****************************************************************/
static int kaweth_open(struct net_device *net)
{
	struct kaweth_device *kaweth = netdev_priv(net);
	int res;

	kaweth_dbg("Opening network device.");

	res = kaweth_resubmit_rx_urb(kaweth, GFP_KERNEL);
	if (res)
		return -EIO;

	usb_fill_int_urb(
		kaweth->irq_urb,
		kaweth->dev,
		usb_rcvintpipe(kaweth->dev, 3),
		kaweth->intbuffer,
		INTBUFFERSIZE,
		int_callback,
		kaweth,
		250); /* overriding the descriptor */
	kaweth->irq_urb->transfer_dma = kaweth->intbufferhandle;
	kaweth->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	res = usb_submit_urb(kaweth->irq_urb, GFP_KERNEL);
	if (res) {
		usb_kill_urb(kaweth->rx_urb);
		return -EIO;
	}

	netif_start_queue(net);

	kaweth_async_set_rx_mode(kaweth);
	return 0;
}

/****************************************************************
 *     kaweth_close
 ****************************************************************/
static int kaweth_close(struct net_device *net)
{
	struct kaweth_device *kaweth = netdev_priv(net);

	netif_stop_queue(net);

	kaweth->status |= KAWETH_STATUS_CLOSING;

	usb_kill_urb(kaweth->irq_urb);
	usb_kill_urb(kaweth->rx_urb);
	usb_kill_urb(kaweth->tx_urb);

	flush_scheduled_work();

	/* a scheduled work may have resubmitted,
	   we hit them again */
	usb_kill_urb(kaweth->irq_urb);
	usb_kill_urb(kaweth->rx_urb);

	kaweth->status &= ~KAWETH_STATUS_CLOSING;

	return 0;
}

static void kaweth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{

	strlcpy(info->driver, driver_name, sizeof(info->driver));
}

static struct ethtool_ops ops = {
	.get_drvinfo = kaweth_get_drvinfo
};

/****************************************************************
 *     kaweth_usb_transmit_complete
 ****************************************************************/
static void kaweth_usb_transmit_complete(struct urb *urb, struct pt_regs *regs)
{
	struct kaweth_device *kaweth = urb->context;
	struct sk_buff *skb = kaweth->tx_skb;

	if (unlikely(urb->status != 0))
		if (urb->status != -ENOENT)
			kaweth_dbg("%s: TX status %d.", kaweth->net->name, urb->status);

	netif_wake_queue(kaweth->net);
	dev_kfree_skb_irq(skb);
}

/****************************************************************
 *     kaweth_start_xmit
 ****************************************************************/
static int kaweth_start_xmit(struct sk_buff *skb, struct net_device *net)
{
	struct kaweth_device *kaweth = netdev_priv(net);
	__le16 *private_header;

	int res;

	spin_lock(&kaweth->device_lock);

	kaweth_async_set_rx_mode(kaweth);
	netif_stop_queue(net);

	/* We now decide whether we can put our special header into the sk_buff */
	if (skb_cloned(skb) || skb_headroom(skb) < 2) {
		/* no such luck - we make our own */
		struct sk_buff *copied_skb;
		copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
		dev_kfree_skb_irq(skb);
		skb = copied_skb;
		if (!copied_skb) {
			kaweth->stats.tx_errors++;
			netif_start_queue(net);
			spin_unlock(&kaweth->device_lock);
			return 0;
		}
	}

	private_header = (__le16 *)__skb_push(skb, 2);
	*private_header = cpu_to_le16(skb->len-2);
	kaweth->tx_skb = skb;

	usb_fill_bulk_urb(kaweth->tx_urb,
		      kaweth->dev,
		      usb_sndbulkpipe(kaweth->dev, 2),
		      private_header,
		      skb->len,
		      kaweth_usb_transmit_complete,
		      kaweth);
	kaweth->end = 0;

	if((res = usb_submit_urb(kaweth->tx_urb, GFP_ATOMIC)))
	{
		kaweth_warn("kaweth failed tx_urb %d", res);
		kaweth->stats.tx_errors++;

		netif_start_queue(net);
		dev_kfree_skb_irq(skb);
	}
	else
	{
		kaweth->stats.tx_packets++;
		kaweth->stats.tx_bytes += skb->len;
		net->trans_start = jiffies;
	}

	spin_unlock(&kaweth->device_lock);

	return 0;
}

/****************************************************************
 *     kaweth_set_rx_mode
 ****************************************************************/
static void kaweth_set_rx_mode(struct net_device *net)
{
	struct kaweth_device *kaweth = netdev_priv(net);

	__u16 packet_filter_bitmap = KAWETH_PACKET_FILTER_DIRECTED |
                                     KAWETH_PACKET_FILTER_BROADCAST |
		                     KAWETH_PACKET_FILTER_MULTICAST;

	kaweth_dbg("Setting Rx mode to %d", packet_filter_bitmap);

	netif_stop_queue(net);

	if (net->flags & IFF_PROMISC) {
		packet_filter_bitmap |= KAWETH_PACKET_FILTER_PROMISCUOUS;
	}
	else if ((net->mc_count) || (net->flags & IFF_ALLMULTI)) {
		packet_filter_bitmap |= KAWETH_PACKET_FILTER_ALL_MULTICAST;
	}

	kaweth->packet_filter_bitmap = packet_filter_bitmap;
	netif_wake_queue(net);
}

/****************************************************************
 *     kaweth_async_set_rx_mode
 ****************************************************************/
static void kaweth_async_set_rx_mode(struct kaweth_device *kaweth)
{
	__u16 packet_filter_bitmap = kaweth->packet_filter_bitmap;
	kaweth->packet_filter_bitmap = 0;
	if (packet_filter_bitmap == 0)
		return;

	{
	int result;
	result = kaweth_control(kaweth,
				usb_sndctrlpipe(kaweth->dev, 0),
				KAWETH_COMMAND_SET_PACKET_FILTER,
				USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
				packet_filter_bitmap,
				0,
				(void *)&kaweth->scratch,
				0,
				KAWETH_CONTROL_TIMEOUT);

	if(result < 0) {
		kaweth_err("Failed to set Rx mode: %d", result);
	}
	else {
		kaweth_dbg("Set Rx mode to %d", packet_filter_bitmap);
	}
	}
}

/****************************************************************
 *     kaweth_netdev_stats
 ****************************************************************/
static struct net_device_stats *kaweth_netdev_stats(struct net_device *dev)
{
	struct kaweth_device *kaweth = netdev_priv(dev);
	return &kaweth->stats;
}

/****************************************************************
 *     kaweth_tx_timeout
 ****************************************************************/
static void kaweth_tx_timeout(struct net_device *net)
{
	struct kaweth_device *kaweth = netdev_priv(net);

	kaweth_warn("%s: Tx timed out. Resetting.", net->name);
	kaweth->stats.tx_errors++;
	net->trans_start = jiffies;

	usb_unlink_urb(kaweth->tx_urb);
}

/****************************************************************
 *     kaweth_probe
 ****************************************************************/
static int kaweth_probe(
		struct usb_interface *intf,
		const struct usb_device_id *id      /* from id_table */
	)
{
	struct usb_device *dev = interface_to_usbdev(intf);
	struct kaweth_device *kaweth;
	struct net_device *netdev;
	const eth_addr_t bcast_addr = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
	int result = 0;

	kaweth_dbg("Kawasaki Device Probe (Device number:%d): 0x%4.4x:0x%4.4x:0x%4.4x",
		 dev->devnum,
		 le16_to_cpu(dev->descriptor.idVendor),
		 le16_to_cpu(dev->descriptor.idProduct),
		 le16_to_cpu(dev->descriptor.bcdDevice));

	kaweth_dbg("Device at %p", dev);

	kaweth_dbg("Descriptor length: %x type: %x",
		 (int)dev->descriptor.bLength,
		 (int)dev->descriptor.bDescriptorType);

	netdev = alloc_etherdev(sizeof(*kaweth));
	if (!netdev)
		return -ENOMEM;

	kaweth = netdev_priv(netdev);
	kaweth->dev = dev;
	kaweth->net = netdev;

	spin_lock_init(&kaweth->device_lock);
	init_waitqueue_head(&kaweth->term_wait);

	kaweth_dbg("Resetting.");

	kaweth_reset(kaweth);

	/*
	 * If high byte of bcdDevice is nonzero, firmware is already
	 * downloaded. Don't try to do it again, or we'll hang the device.
	 */

	if (le16_to_cpu(dev->descriptor.bcdDevice) >> 8) {
		kaweth_info("Firmware present in device.");
	} else {
		/* Download the firmware */
		kaweth_info("Downloading firmware...");
		kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_new_code,
						      len_kaweth_new_code,
						      100,
						      2)) < 0) {
			kaweth_err("Error downloading firmware (%d)", result);
			goto err_fw;
		}

		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_new_code_fix,
						      len_kaweth_new_code_fix,
						      100,
						      3)) < 0) {
			kaweth_err("Error downloading firmware fix (%d)", result);
			goto err_fw;
		}

		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_trigger_code,
						      len_kaweth_trigger_code,
						      126,
						      2)) < 0) {
			kaweth_err("Error downloading trigger code (%d)", result);
			goto err_fw;

		}

		if ((result = kaweth_download_firmware(kaweth,
						      kaweth_trigger_code_fix,
						      len_kaweth_trigger_code_fix,
						      126,
						      3)) < 0) {
			kaweth_err("Error downloading trigger code fix (%d)", result);
			goto err_fw;
		}


		if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
			kaweth_err("Error triggering firmware (%d)", result);
			goto err_fw;
		}

		/* Device will now disappear for a moment...  */
		kaweth_info("Firmware loaded.  I'll be back...");
err_fw:
		free_page((unsigned long)kaweth->firmware_buf);
		free_netdev(netdev);
		return -EIO;
	}

	result = kaweth_read_configuration(kaweth);

	if(result < 0) {
		kaweth_err("Error reading configuration (%d), no net device created", result);
		goto err_free_netdev;
	}

	kaweth_info("Statistics collection: %x", kaweth->configuration.statistics_mask);
	kaweth_info("Multicast filter limit: %x", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
	kaweth_info("MTU: %d", le16_to_cpu(kaweth->configuration.segment_size));
	kaweth_info("Read MAC address %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
		 (int)kaweth->configuration.hw_addr[0],
		 (int)kaweth->configuration.hw_addr[1],
		 (int)kaweth->configuration.hw_addr[2],
		 (int)kaweth->configuration.hw_addr[3],
		 (int)kaweth->configuration.hw_addr[4],
		 (int)kaweth->configuration.hw_addr[5]);

	if(!memcmp(&kaweth->configuration.hw_addr,
                   &bcast_addr,
		   sizeof(bcast_addr))) {
		kaweth_err("Firmware not functioning properly, no net device created");
		goto err_free_netdev;
	}

	if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
		kaweth_dbg("Error setting URB size");
		goto err_free_netdev;
	}

	if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
		kaweth_err("Error setting SOFS wait");
		goto err_free_netdev;
	}

	result = kaweth_set_receive_filter(kaweth,
                                           KAWETH_PACKET_FILTER_DIRECTED |
                                           KAWETH_PACKET_FILTER_BROADCAST |
                                           KAWETH_PACKET_FILTER_MULTICAST);

	if(result < 0) {
		kaweth_err("Error setting receive filter");
		goto err_free_netdev;
	}

	kaweth_dbg("Initializing net device.");

	kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!kaweth->tx_urb)
		goto err_free_netdev;
	kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!kaweth->rx_urb)
		goto err_only_tx;
	kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!kaweth->irq_urb)
		goto err_tx_and_rx;

	kaweth->intbuffer = usb_buffer_alloc(	kaweth->dev,
						INTBUFFERSIZE,
						GFP_KERNEL,
						&kaweth->intbufferhandle);
	if (!kaweth->intbuffer)
		goto err_tx_and_rx_and_irq;
	kaweth->rx_buf = usb_buffer_alloc(	kaweth->dev,
						KAWETH_BUF_SIZE,
						GFP_KERNEL,
						&kaweth->rxbufferhandle);
	if (!kaweth->rx_buf)
		goto err_all_but_rxbuf;

	memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
	memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
               sizeof(kaweth->configuration.hw_addr));

	netdev->open = kaweth_open;
	netdev->stop = kaweth_close;

	netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
	netdev->tx_timeout = kaweth_tx_timeout;

	netdev->hard_start_xmit = kaweth_start_xmit;
	netdev->set_multicast_list = kaweth_set_rx_mode;
	netdev->get_stats = kaweth_netdev_stats;
	netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
	SET_ETHTOOL_OPS(netdev, &ops);

	/* kaweth is zeroed as part of alloc_netdev */

	INIT_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl, (void *)kaweth);

	SET_MODULE_OWNER(netdev);

	usb_set_intfdata(intf, kaweth);

#if 0
// dma_supported() is deeply broken on almost all architectures
	if (dma_supported (&intf->dev, 0xffffffffffffffffULL))
		kaweth->net->features |= NETIF_F_HIGHDMA;
#endif

	SET_NETDEV_DEV(netdev, &intf->dev);
	if (register_netdev(netdev) != 0) {
		kaweth_err("Error registering netdev.");
		goto err_intfdata;
	}

	kaweth_info("kaweth interface created at %s", kaweth->net->name);

	kaweth_dbg("Kaweth probe returning.");

	return 0;

err_intfdata:
	usb_set_intfdata(intf, NULL);
	usb_buffer_free(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
err_all_but_rxbuf:
	usb_buffer_free(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
err_tx_and_rx_and_irq:
	usb_free_urb(kaweth->irq_urb);
err_tx_and_rx:
	usb_free_urb(kaweth->rx_urb);
err_only_tx:
	usb_free_urb(kaweth->tx_urb);
err_free_netdev:
	free_netdev(netdev);

	return -EIO;
}

/****************************************************************
 *     kaweth_disconnect
 ****************************************************************/
static void kaweth_disconnect(struct usb_interface *intf)
{
	struct kaweth_device *kaweth = usb_get_intfdata(intf);
	struct net_device *netdev;

	kaweth_info("Unregistering");

	usb_set_intfdata(intf, NULL);
	if (!kaweth) {
		kaweth_warn("unregistering non-existant device");
		return;
	}
	netdev = kaweth->net;

	kaweth_dbg("Unregistering net device");
	unregister_netdev(netdev);

	usb_free_urb(kaweth->rx_urb);
	usb_free_urb(kaweth->tx_urb);
	usb_free_urb(kaweth->irq_urb);

	usb_buffer_free(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
	usb_buffer_free(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);

	free_netdev(netdev);
}


// FIXME this completion stuff is a modified clone of
// an OLD version of some stuff in usb.c ...
struct usb_api_data {
	wait_queue_head_t wqh;
	int done;
};

/*-------------------------------------------------------------------*
 * completion handler for compatibility wrappers (sync control/bulk) *
 *-------------------------------------------------------------------*/
static void usb_api_blocking_completion(struct urb *urb, struct pt_regs *regs)
{
        struct usb_api_data *awd = (struct usb_api_data *)urb->context;

	awd->done=1;
	wake_up(&awd->wqh);
}

/*-------------------------------------------------------------------*
 *                         COMPATIBILITY STUFF                       *
 *-------------------------------------------------------------------*/

// Starts urb and waits for completion or timeout
static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
{
	struct usb_api_data awd;
        int status;

        init_waitqueue_head(&awd.wqh);
        awd.done = 0;

        urb->context = &awd;
        status = usb_submit_urb(urb, GFP_NOIO);
        if (status) {
                // something went wrong
                usb_free_urb(urb);
                return status;
        }

	if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
                // timeout
                kaweth_warn("usb_control/bulk_msg: timeout");
                usb_kill_urb(urb);  // remove urb safely
                status = -ETIMEDOUT;
        }
	else {
                status = urb->status;
	}

        if (actual_length) {
                *actual_length = urb->actual_length;
	}

        usb_free_urb(urb);
        return status;
}

/*-------------------------------------------------------------------*/
// returns status (negative) or length (positive)
static int kaweth_internal_control_msg(struct usb_device *usb_dev,
				       unsigned int pipe,
				       struct usb_ctrlrequest *cmd, void *data,
				       int len, int timeout)
{
        struct urb *urb;
        int retv;
        int length;

        urb = usb_alloc_urb(0, GFP_NOIO);
        if (!urb)
                return -ENOMEM;

        usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
			 len, usb_api_blocking_completion, NULL);

        retv = usb_start_wait_urb(urb, timeout, &length);
        if (retv < 0) {
                return retv;
	}
        else {
                return length;
	}
}


/****************************************************************
 *     kaweth_init
 ****************************************************************/
static int __init kaweth_init(void)
{
	kaweth_dbg("Driver loading");
	return usb_register(&kaweth_driver);
}

/****************************************************************
 *     kaweth_exit
 ****************************************************************/
static void __exit kaweth_exit(void)
{
	usb_deregister(&kaweth_driver);
}

module_init(kaweth_init);
module_exit(kaweth_exit);