summaryrefslogtreecommitdiffstats
path: root/drivers/usb/net/kaweth.c
blob: 957d4ad316f9bf86f7636119bbc4b161a34ac9d1 (plain)
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(0x1668, 0x0323) }, /* Actiontec USB Ethernet */
	{ 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 = {
	.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 *);
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 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 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 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 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);