summaryrefslogtreecommitdiff
path: root/drivers/usb/gadget/ether.c
blob: 5a18e035b6ef9f39d1c20becf9dea85e46931ebe (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
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
/*
 * ether.c -- Ethernet gadget driver, with CDC and non-CDC options
 *
 * Copyright (C) 2003-2005,2008 David Brownell
 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
 * Copyright (C) 2008 Nokia Corporation
 *
 * 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 of the License, 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
 */

#include <common.h>
#include <asm/errno.h>
#include <linux/usb/ch9.h>
#include <linux/usb/cdc.h>
#include <linux/usb/gadget.h>
#include <net.h>
#include <linux/ctype.h>

#include "gadget_chips.h"

#define USB_NET_NAME "usb0"

#define atomic_read
extern struct platform_data brd;
#define spin_lock(x)
#define spin_unlock(x)


unsigned packet_received, packet_sent;

#define DEV_CONFIG_CDC	1
#define GFP_ATOMIC ((gfp_t) 0)
#define GFP_KERNEL ((gfp_t) 0)

/*
 * Ethernet gadget driver -- with CDC and non-CDC options
 * Builds on hardware support for a full duplex link.
 *
 * CDC Ethernet is the standard USB solution for sending Ethernet frames
 * using USB.  Real hardware tends to use the same framing protocol but look
 * different for control features.  This driver strongly prefers to use
 * this USB-IF standard as its open-systems interoperability solution;
 * most host side USB stacks (except from Microsoft) support it.
 *
 * This is sometimes called "CDC ECM" (Ethernet Control Model) to support
 * TLA-soup.  "CDC ACM" (Abstract Control Model) is for modems, and a new
 * "CDC EEM" (Ethernet Emulation Model) is starting to spread.
 *
 * There's some hardware that can't talk CDC ECM.  We make that hardware
 * implement a "minimalist" vendor-agnostic CDC core:  same framing, but
 * link-level setup only requires activating the configuration.  Only the
 * endpoint descriptors, and product/vendor IDs, are relevant; no control
 * operations are available.  Linux supports it, but other host operating
 * systems may not.  (This is a subset of CDC Ethernet.)
 *
 * It turns out that if you add a few descriptors to that "CDC Subset",
 * (Windows) host side drivers from MCCI can treat it as one submode of
 * a proprietary scheme called "SAFE" ... without needing to know about
 * specific product/vendor IDs.  So we do that, making it easier to use
 * those MS-Windows drivers.  Those added descriptors make it resemble a
 * CDC MDLM device, but they don't change device behavior at all.  (See
 * MCCI Engineering report 950198 "SAFE Networking Functions".)
 *
 * A third option is also in use.  Rather than CDC Ethernet, or something
 * simpler, Microsoft pushes their own approach: RNDIS.  The published
 * RNDIS specs are ambiguous and appear to be incomplete, and are also
 * needlessly complex.  They borrow more from CDC ACM than CDC ECM.
 */
#define ETH_ALEN	6		/* Octets in one ethernet addr	 */
#define ETH_HLEN	14		/* Total octets in header.	 */
#define ETH_ZLEN	60		/* Min. octets in frame sans FCS */
#define ETH_DATA_LEN	1500		/* Max. octets in payload	 */
#define ETH_FRAME_LEN	PKTSIZE_ALIGN	/* Max. octets in frame sans FCS */
#define ETH_FCS_LEN	4		/* Octets in the FCS		 */

#define DRIVER_DESC		"Ethernet Gadget"
/* Based on linux 2.6.27 version */
#define DRIVER_VERSION		"May Day 2005"

static const char shortname[] = "ether";
static const char driver_desc[] = DRIVER_DESC;

#define RX_EXTRA	20		/* guard against rx overflows */

/* CDC support the same host-chosen outgoing packet filters. */
#define	DEFAULT_FILTER	(USB_CDC_PACKET_TYPE_BROADCAST \
			|USB_CDC_PACKET_TYPE_ALL_MULTICAST \
			|USB_CDC_PACKET_TYPE_PROMISCUOUS \
			|USB_CDC_PACKET_TYPE_DIRECTED)

#define USB_CONNECT_TIMEOUT (3 * CONFIG_SYS_HZ)

/*-------------------------------------------------------------------------*/
static struct eth_dev l_ethdev;
static struct eth_device l_netdev;
static struct usb_gadget_driver eth_driver;

/*-------------------------------------------------------------------------*/

/* "main" config is either CDC, or its simple subset */
static inline int is_cdc(struct eth_dev *dev)
{
#if	!defined(DEV_CONFIG_SUBSET)
	return 1;		/* only cdc possible */
#elif	!defined(DEV_CONFIG_CDC)
	return 0;		/* only subset possible */
#else
	return dev->cdc;	/* depends on what hardware we found */
#endif
}

#define	subset_active(dev)	(!is_cdc(dev))
#define	cdc_active(dev)		(is_cdc(dev))

#define DEFAULT_QLEN	2	/* double buffering by default */

/* peak bulk transfer bits-per-second */
#define	HS_BPS		(13 * 512 * 8 * 1000 * 8)
#define	FS_BPS		(19 *  64 * 1 * 1000 * 8)

#ifdef CONFIG_USB_GADGET_DUALSPEED
#define	DEVSPEED	USB_SPEED_HIGH

#ifdef CONFIG_USB_ETH_QMULT
#define qmult CONFIG_USB_ETH_QMULT
#else
#define qmult 5
#endif

/* for dual-speed hardware, use deeper queues at highspeed */
#define qlen(gadget) \
	(DEFAULT_QLEN*((gadget->speed == USB_SPEED_HIGH) ? qmult : 1))

static inline int BITRATE(struct usb_gadget *g)
{
	return (g->speed == USB_SPEED_HIGH) ? HS_BPS : FS_BPS;
}

#else	/* full speed (low speed doesn't do bulk) */

#define qmult		1

#define	DEVSPEED	USB_SPEED_FULL

#define qlen(gadget) DEFAULT_QLEN

static inline int BITRATE(struct usb_gadget *g)
{
	return FS_BPS;
}
#endif

struct eth_dev {
	struct usb_gadget	*gadget;
	struct usb_request	*req;		/* for control responses */
	struct usb_request	*stat_req;	/* for cdc status */

	u8			config;
	struct usb_ep		*in_ep, *out_ep, *status_ep;
	const struct usb_endpoint_descriptor
				*in, *out, *status;

	struct usb_request	*tx_req, *rx_req;

	struct eth_device	*net;
	unsigned int		tx_qlen;

	unsigned		zlp:1;
	unsigned		cdc:1;
	unsigned		suspended:1;
	unsigned		network_started:1;
	u16			cdc_filter;
	unsigned long		todo;
	int			mtu;
#define	WORK_RX_MEMORY		0
	u8			host_mac[ETH_ALEN];
};

/*
 * This version autoconfigures as much as possible at run-time.
 *
 * It also ASSUMES a self-powered device, without remote wakeup,
 * although remote wakeup support would make sense.
 */

/*-------------------------------------------------------------------------*/

/*
 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 * Instead:  allocate your own, using normal USB-IF procedures.
 */

/*
 * Thanks to NetChip Technologies for donating this product ID.
 * It's for devices with only CDC Ethernet configurations.
 */
#define CDC_VENDOR_NUM		0x0525	/* NetChip */
#define CDC_PRODUCT_NUM		0xa4a1	/* Linux-USB Ethernet Gadget */

/*
 * For hardware that can't talk CDC, we use the same vendor ID that
 * ARM Linux has used for ethernet-over-usb, both with sa1100 and
 * with pxa250.  We're protocol-compatible, if the host-side drivers
 * use the endpoint descriptors.  bcdDevice (version) is nonzero, so
 * drivers that need to hard-wire endpoint numbers have a hook.
 *
 * The protocol is a minimal subset of CDC Ether, which works on any bulk
 * hardware that's not deeply broken ... even on hardware that can't talk
 * RNDIS (like SA-1100, with no interrupt endpoint, or anything that
 * doesn't handle control-OUT).
 */
#define	SIMPLE_VENDOR_NUM	0x049f
#define	SIMPLE_PRODUCT_NUM	0x505a

/*
 * Some systems will want different product identifers published in the
 * device descriptor, either numbers or strings or both.  These string
 * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 */

static ushort bcdDevice;
#if defined(CONFIG_USBNET_MANUFACTURER)
static char *iManufacturer = CONFIG_USBNET_MANUFACTURER;
#else
static char *iManufacturer = "U-boot";
#endif
static char *iProduct;
static char *iSerialNumber;
static char dev_addr[18];
static char host_addr[18];

/*-------------------------------------------------------------------------*/

/*
 * USB DRIVER HOOKUP (to the hardware driver, below us), mostly
 * ep0 implementation:  descriptors, config management, setup().
 * also optional class-specific notification interrupt transfer.
 */

/*
 * DESCRIPTORS ... most are static, but strings and (full) configuration
 * descriptors are built on demand.  For now we do either full CDC, or
 * our simple subset.
 */

#define STRING_MANUFACTURER		1
#define STRING_PRODUCT			2
#define STRING_ETHADDR			3
#define STRING_DATA			4
#define STRING_CONTROL			5
#define STRING_CDC			7
#define STRING_SUBSET			8
#define STRING_SERIALNUMBER		10

/* holds our biggest descriptor */
#define USB_BUFSIZ	256

/*
 * This device advertises one configuration, eth_config,
 * on hardware supporting at least two configs.
 *
 * FIXME define some higher-powered configurations to make it easier
 * to recharge batteries ...
 */

#define DEV_CONFIG_VALUE	1	/* cdc or subset */

static struct usb_device_descriptor
device_desc = {
	.bLength =		sizeof device_desc,
	.bDescriptorType =	USB_DT_DEVICE,

	.bcdUSB =		__constant_cpu_to_le16(0x0200),

	.bDeviceClass =		USB_CLASS_COMM,
	.bDeviceSubClass =	0,
	.bDeviceProtocol =	0,

	.idVendor =		__constant_cpu_to_le16(CDC_VENDOR_NUM),
	.idProduct =		__constant_cpu_to_le16(CDC_PRODUCT_NUM),
	.iManufacturer =	STRING_MANUFACTURER,
	.iProduct =		STRING_PRODUCT,
	.bNumConfigurations =	1,
};

static struct usb_otg_descriptor
otg_descriptor = {
	.bLength =		sizeof otg_descriptor,
	.bDescriptorType =	USB_DT_OTG,

	.bmAttributes =		USB_OTG_SRP,
};

static struct usb_config_descriptor
eth_config = {
	.bLength =		sizeof eth_config,
	.bDescriptorType =	USB_DT_CONFIG,

	/* compute wTotalLength on the fly */
	.bNumInterfaces =	2,
	.bConfigurationValue =	DEV_CONFIG_VALUE,
	.iConfiguration =	STRING_CDC,
	.bmAttributes =		USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
	.bMaxPower =		1,
};

/*
 * Compared to the simple CDC subset, the full CDC Ethernet model adds
 * three class descriptors, two interface descriptors, optional status
 * endpoint.  Both have a "data" interface and two bulk endpoints.
 * There are also differences in how control requests are handled.
 */

#ifdef	DEV_CONFIG_CDC
static struct usb_interface_descriptor
control_intf = {
	.bLength =		sizeof control_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bInterfaceNumber =	0,
	/* status endpoint is optional; this may be patched later */
	.bNumEndpoints =	1,
	.bInterfaceClass =	USB_CLASS_COMM,
	.bInterfaceSubClass =	USB_CDC_SUBCLASS_ETHERNET,
	.bInterfaceProtocol =	USB_CDC_PROTO_NONE,
	.iInterface =		STRING_CONTROL,
};
#endif

static const struct usb_cdc_header_desc header_desc = {
	.bLength =		sizeof header_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_HEADER_TYPE,

	.bcdCDC =		__constant_cpu_to_le16(0x0110),
};

#if defined(DEV_CONFIG_CDC)

static const struct usb_cdc_union_desc union_desc = {
	.bLength =		sizeof union_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_UNION_TYPE,

	.bMasterInterface0 =	0,	/* index of control interface */
	.bSlaveInterface0 =	1,	/* index of DATA interface */
};

#endif	/* CDC */

#ifndef DEV_CONFIG_CDC

/*
 * "SAFE" loosely follows CDC WMC MDLM, violating the spec in various
 * ways:  data endpoints live in the control interface, there's no data
 * interface, and it's not used to talk to a cell phone radio.
 */

static const struct usb_cdc_mdlm_desc mdlm_desc = {
	.bLength =		sizeof mdlm_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_MDLM_TYPE,

	.bcdVersion =		__constant_cpu_to_le16(0x0100),
	.bGUID = {
		0x5d, 0x34, 0xcf, 0x66, 0x11, 0x18, 0x11, 0xd6,
		0xa2, 0x1a, 0x00, 0x01, 0x02, 0xca, 0x9a, 0x7f,
	},
};

/*
 * since "usb_cdc_mdlm_detail_desc" is a variable length structure, we
 * can't really use its struct.  All we do here is say that we're using
 * the submode of "SAFE" which directly matches the CDC Subset.
 */
static const u8 mdlm_detail_desc[] = {
	6,
	USB_DT_CS_INTERFACE,
	USB_CDC_MDLM_DETAIL_TYPE,

	0,	/* "SAFE" */
	0,	/* network control capabilities (none) */
	0,	/* network data capabilities ("raw" encapsulation) */
};

#endif

static const struct usb_cdc_ether_desc ether_desc = {
	.bLength =		sizeof(ether_desc),
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_ETHERNET_TYPE,

	/* this descriptor actually adds value, surprise! */
	.iMACAddress =		STRING_ETHADDR,
	.bmEthernetStatistics = __constant_cpu_to_le32(0), /* no statistics */
	.wMaxSegmentSize =	__constant_cpu_to_le16(ETH_FRAME_LEN),
	.wNumberMCFilters =	__constant_cpu_to_le16(0),
	.bNumberPowerFilters =	0,
};

#if defined(DEV_CONFIG_CDC)

/*
 * include the status endpoint if we can, even where it's optional.
 * use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
 * packet, to simplify cancellation; and a big transfer interval, to
 * waste less bandwidth.
 *
 * some drivers (like Linux 2.4 cdc-ether!) "need" it to exist even
 * if they ignore the connect/disconnect notifications that real aether
 * can provide.  more advanced cdc configurations might want to support
 * encapsulated commands (vendor-specific, using control-OUT).
 */

#define LOG2_STATUS_INTERVAL_MSEC	5	/* 1 << 5 == 32 msec */
#define STATUS_BYTECOUNT		16	/* 8 byte header + data */

static struct usb_endpoint_descriptor
fs_status_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_INT,
	.wMaxPacketSize =	__constant_cpu_to_le16(STATUS_BYTECOUNT),
	.bInterval =		1 << LOG2_STATUS_INTERVAL_MSEC,
};
#endif

#ifdef	DEV_CONFIG_CDC

/* the default data interface has no endpoints ... */

static const struct usb_interface_descriptor
data_nop_intf = {
	.bLength =		sizeof data_nop_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bInterfaceNumber =	1,
	.bAlternateSetting =	0,
	.bNumEndpoints =	0,
	.bInterfaceClass =	USB_CLASS_CDC_DATA,
	.bInterfaceSubClass =	0,
	.bInterfaceProtocol =	0,
};

/* ... but the "real" data interface has two bulk endpoints */

static const struct usb_interface_descriptor
data_intf = {
	.bLength =		sizeof data_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bInterfaceNumber =	1,
	.bAlternateSetting =	1,
	.bNumEndpoints =	2,
	.bInterfaceClass =	USB_CLASS_CDC_DATA,
	.bInterfaceSubClass =	0,
	.bInterfaceProtocol =	0,
	.iInterface =		STRING_DATA,
};

#endif

#ifdef DEV_CONFIG_SUBSET

/*
 * "Simple" CDC-subset option is a simple vendor-neutral model that most
 * full speed controllers can handle:  one interface, two bulk endpoints.
 *
 * To assist host side drivers, we fancy it up a bit, and add descriptors
 * so some host side drivers will understand it as a "SAFE" variant.
 */

static const struct usb_interface_descriptor
subset_data_intf = {
	.bLength =		sizeof subset_data_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bInterfaceNumber =	0,
	.bAlternateSetting =	0,
	.bNumEndpoints =	2,
	.bInterfaceClass =      USB_CLASS_COMM,
	.bInterfaceSubClass =	USB_CDC_SUBCLASS_MDLM,
	.bInterfaceProtocol =	0,
	.iInterface =		STRING_DATA,
};

#endif	/* SUBSET */

static struct usb_endpoint_descriptor
fs_source_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static struct usb_endpoint_descriptor
fs_sink_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static const struct usb_descriptor_header *fs_eth_function[11] = {
	(struct usb_descriptor_header *) &otg_descriptor,
#ifdef DEV_CONFIG_CDC
	/* "cdc" mode descriptors */
	(struct usb_descriptor_header *) &control_intf,
	(struct usb_descriptor_header *) &header_desc,
	(struct usb_descriptor_header *) &union_desc,
	(struct usb_descriptor_header *) &ether_desc,
	/* NOTE: status endpoint may need to be removed */
	(struct usb_descriptor_header *) &fs_status_desc,
	/* data interface, with altsetting */
	(struct usb_descriptor_header *) &data_nop_intf,
	(struct usb_descriptor_header *) &data_intf,
	(struct usb_descriptor_header *) &fs_source_desc,
	(struct usb_descriptor_header *) &fs_sink_desc,
	NULL,
#endif /* DEV_CONFIG_CDC */
};

static inline void fs_subset_descriptors(void)
{
#ifdef DEV_CONFIG_SUBSET
	/* behavior is "CDC Subset"; extra descriptors say "SAFE" */
	fs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
	fs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
	fs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
	fs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
	fs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
	fs_eth_function[6] = (struct usb_descriptor_header *) &fs_source_desc;
	fs_eth_function[7] = (struct usb_descriptor_header *) &fs_sink_desc;
	fs_eth_function[8] = NULL;
#else
	fs_eth_function[1] = NULL;
#endif
}

/*
 * usb 2.0 devices need to expose both high speed and full speed
 * descriptors, unless they only run at full speed.
 */

#if defined(DEV_CONFIG_CDC)
static struct usb_endpoint_descriptor
hs_status_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bmAttributes =		USB_ENDPOINT_XFER_INT,
	.wMaxPacketSize =	__constant_cpu_to_le16(STATUS_BYTECOUNT),
	.bInterval =		LOG2_STATUS_INTERVAL_MSEC + 4,
};
#endif /* DEV_CONFIG_CDC */

static struct usb_endpoint_descriptor
hs_source_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	__constant_cpu_to_le16(512),
};

static struct usb_endpoint_descriptor
hs_sink_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	__constant_cpu_to_le16(512),
};

static struct usb_qualifier_descriptor
dev_qualifier = {
	.bLength =		sizeof dev_qualifier,
	.bDescriptorType =	USB_DT_DEVICE_QUALIFIER,

	.bcdUSB =		__constant_cpu_to_le16(0x0200),
	.bDeviceClass =		USB_CLASS_COMM,

	.bNumConfigurations =	1,
};

static const struct usb_descriptor_header *hs_eth_function[11] = {
	(struct usb_descriptor_header *) &otg_descriptor,
#ifdef DEV_CONFIG_CDC
	/* "cdc" mode descriptors */
	(struct usb_descriptor_header *) &control_intf,
	(struct usb_descriptor_header *) &header_desc,
	(struct usb_descriptor_header *) &union_desc,
	(struct usb_descriptor_header *) &ether_desc,
	/* NOTE: status endpoint may need to be removed */
	(struct usb_descriptor_header *) &hs_status_desc,
	/* data interface, with altsetting */
	(struct usb_descriptor_header *) &data_nop_intf,
	(struct usb_descriptor_header *) &data_intf,
	(struct usb_descriptor_header *) &hs_source_desc,
	(struct usb_descriptor_header *) &hs_sink_desc,
	NULL,
#endif /* DEV_CONFIG_CDC */
};

static inline void hs_subset_descriptors(void)
{
#ifdef DEV_CONFIG_SUBSET
	/* behavior is "CDC Subset"; extra descriptors say "SAFE" */
	hs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
	hs_eth_function[2] = (struct usb_descriptor_header *) &header_desc;
	hs_eth_function[3] = (struct usb_descriptor_header *) &mdlm_desc;
	hs_eth_function[4] = (struct usb_descriptor_header *) &mdlm_detail_desc;
	hs_eth_function[5] = (struct usb_descriptor_header *) &ether_desc;
	hs_eth_function[6] = (struct usb_descriptor_header *) &hs_source_desc;
	hs_eth_function[7] = (struct usb_descriptor_header *) &hs_sink_desc;
	hs_eth_function[8] = NULL;
#else
	hs_eth_function[1] = NULL;
#endif
}

/* maxpacket and other transfer characteristics vary by speed. */
static inline struct usb_endpoint_descriptor *
ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
		struct usb_endpoint_descriptor *fs)
{
	if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
		return hs;
	return fs;
}

/*-------------------------------------------------------------------------*/

/* descriptors that are built on-demand */

static char manufacturer[50];
static char product_desc[40] = DRIVER_DESC;
static char serial_number[20];

/* address that the host will use ... usually assigned at random */
static char ethaddr[2 * ETH_ALEN + 1];

/* static strings, in UTF-8 */
static struct usb_string		strings[] = {
	{ STRING_MANUFACTURER,	manufacturer, },
	{ STRING_PRODUCT,	product_desc, },
	{ STRING_SERIALNUMBER,	serial_number, },
	{ STRING_DATA,		"Ethernet Data", },
	{ STRING_ETHADDR,	ethaddr, },
#ifdef	DEV_CONFIG_CDC
	{ STRING_CDC,		"CDC Ethernet", },
	{ STRING_CONTROL,	"CDC Communications Control", },
#endif
#ifdef	DEV_CONFIG_SUBSET
	{ STRING_SUBSET,	"CDC Ethernet Subset", },
#endif
	{  }		/* end of list */
};

static struct usb_gadget_strings	stringtab = {
	.language	= 0x0409,	/* en-us */
	.strings	= strings,
};

/*============================================================================*/
static u8 control_req[USB_BUFSIZ];
static u8 status_req[STATUS_BYTECOUNT] __attribute__ ((aligned(4)));


/**
 * strlcpy - Copy a %NUL terminated string into a sized buffer
 * @dest: Where to copy the string to
 * @src: Where to copy the string from
 * @size: size of destination buffer
 *
 * Compatible with *BSD: the result is always a valid
 * NUL-terminated string that fits in the buffer (unless,
 * of course, the buffer size is zero). It does not pad
 * out the result like strncpy() does.
 */
size_t strlcpy(char *dest, const char *src, size_t size)
{
	size_t ret = strlen(src);

	if (size) {
		size_t len = (ret >= size) ? size - 1 : ret;
		memcpy(dest, src, len);
		dest[len] = '\0';
	}
	return ret;
}

/*============================================================================*/

/*
 * one config, two interfaces:  control, data.
 * complications: class descriptors, and an altsetting.
 */
static int
config_buf(struct usb_gadget *g, u8 *buf, u8 type, unsigned index, int is_otg)
{
	int					len;
	const struct usb_config_descriptor	*config;
	const struct usb_descriptor_header	**function;
	int					hs = 0;

	if (gadget_is_dualspeed(g)) {
		hs = (g->speed == USB_SPEED_HIGH);
		if (type == USB_DT_OTHER_SPEED_CONFIG)
			hs = !hs;
	}
#define which_fn(t)	(hs ? hs_ ## t ## _function : fs_ ## t ## _function)

	if (index >= device_desc.bNumConfigurations)
		return -EINVAL;

	config = &eth_config;
	function = which_fn(eth);

	/* for now, don't advertise srp-only devices */
	if (!is_otg)
		function++;

	len = usb_gadget_config_buf(config, buf, USB_BUFSIZ, function);
	if (len < 0)
		return len;
	((struct usb_config_descriptor *) buf)->bDescriptorType = type;
	return len;
}

/*-------------------------------------------------------------------------*/

static int alloc_requests(struct eth_dev *dev, unsigned n, gfp_t gfp_flags);

static int
set_ether_config(struct eth_dev *dev, gfp_t gfp_flags)
{
	int					result = 0;
	struct usb_gadget			*gadget = dev->gadget;

#if defined(DEV_CONFIG_CDC)
	/* status endpoint used for (optionally) CDC */
	if (!subset_active(dev) && dev->status_ep) {
		dev->status = ep_desc(gadget, &hs_status_desc,
						&fs_status_desc);
		dev->status_ep->driver_data = dev;

		result = usb_ep_enable(dev->status_ep, dev->status);
		if (result != 0) {
			debug("enable %s --> %d\n",
				dev->status_ep->name, result);
			goto done;
		}
	}
#endif

	dev->in = ep_desc(gadget, &hs_source_desc, &fs_source_desc);
	dev->in_ep->driver_data = dev;

	dev->out = ep_desc(gadget, &hs_sink_desc, &fs_sink_desc);
	dev->out_ep->driver_data = dev;

	/*
	 * With CDC,  the host isn't allowed to use these two data
	 * endpoints in the default altsetting for the interface.
	 * so we don't activate them yet.  Reset from SET_INTERFACE.
	 */
	if (!cdc_active(dev)) {
		result = usb_ep_enable(dev->in_ep, dev->in);
		if (result != 0) {
			debug("enable %s --> %d\n",
				dev->in_ep->name, result);
			goto done;
		}

		result = usb_ep_enable(dev->out_ep, dev->out);
		if (result != 0) {
			debug("enable %s --> %d\n",
				dev->out_ep->name, result);
			goto done;
		}
	}

done:
	if (result == 0)
		result = alloc_requests(dev, qlen(gadget), gfp_flags);

	/* on error, disable any endpoints  */
	if (result < 0) {
		if (!subset_active(dev) && dev->status_ep)
			(void) usb_ep_disable(dev->status_ep);
		dev->status = NULL;
		(void) usb_ep_disable(dev->in_ep);
		(void) usb_ep_disable(dev->out_ep);
		dev->in = NULL;
		dev->out = NULL;
	}

	/* caller is responsible for cleanup on error */
	return result;
}

static void eth_reset_config(struct eth_dev *dev)
{
	if (dev->config == 0)
		return;

	debug("%s\n", __func__);

	/*
	 * disable endpoints, forcing (synchronous) completion of
	 * pending i/o.  then free the requests.
	 */

	if (dev->in) {
		usb_ep_disable(dev->in_ep);
		if (dev->tx_req) {
			usb_ep_free_request(dev->in_ep, dev->tx_req);
			dev->tx_req = NULL;
		}
	}
	if (dev->out) {
		usb_ep_disable(dev->out_ep);
		if (dev->rx_req) {
			usb_ep_free_request(dev->out_ep, dev->rx_req);
			dev->rx_req = NULL;
		}
	}
	if (dev->status)
		usb_ep_disable(dev->status_ep);

	dev->cdc_filter = 0;
	dev->config = 0;
}

/*
 * change our operational config.  must agree with the code
 * that returns config descriptors, and altsetting code.
 */
static int eth_set_config(struct eth_dev *dev, unsigned number,
				gfp_t gfp_flags)
{
	int			result = 0;
	struct usb_gadget	*gadget = dev->gadget;

	if (gadget_is_sa1100(gadget)
			&& dev->config
			&& dev->tx_qlen != 0) {
		/* tx fifo is full, but we can't clear it...*/
		error("can't change configurations");
		return -ESPIPE;
	}
	eth_reset_config(dev);

	switch (number) {
	case DEV_CONFIG_VALUE:
		result = set_ether_config(dev, gfp_flags);
		break;
	default:
		result = -EINVAL;
		/* FALL THROUGH */
	case 0:
		break;
	}

	if (result) {
		if (number)
			eth_reset_config(dev);
		usb_gadget_vbus_draw(dev->gadget,
				gadget_is_otg(dev->gadget) ? 8 : 100);
	} else {
		char *speed;
		unsigned power;

		power = 2 * eth_config.bMaxPower;
		usb_gadget_vbus_draw(dev->gadget, power);

		switch (gadget->speed) {
		case USB_SPEED_FULL:
			speed = "full"; break;
#ifdef CONFIG_USB_GADGET_DUALSPEED
		case USB_SPEED_HIGH:
			speed = "high"; break;
#endif
		default:
			speed = "?"; break;
		}

		dev->config = number;
		printf("%s speed config #%d: %d mA, %s, using %s\n",
				speed, number, power, driver_desc,
				(cdc_active(dev) ? "CDC Ethernet"
						: "CDC Ethernet Subset"));
	}
	return result;
}

/*-------------------------------------------------------------------------*/

#ifdef	DEV_CONFIG_CDC

/*
 * The interrupt endpoint is used in CDC networking models (Ethernet, ATM)
 * only to notify the host about link status changes (which we support) or
 * report completion of some encapsulated command.  Since
 * we want this CDC Ethernet code to be vendor-neutral, we don't use that
 * command mechanism; and only one status request is ever queued.
 */
static void eth_status_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct usb_cdc_notification	*event = req->buf;
	int				value = req->status;
	struct eth_dev			*dev = ep->driver_data;

	/* issue the second notification if host reads the first */
	if (event->bNotificationType == USB_CDC_NOTIFY_NETWORK_CONNECTION
			&& value == 0) {
		__le32	*data = req->buf + sizeof *event;

		event->bmRequestType = 0xA1;
		event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
		event->wValue = __constant_cpu_to_le16(0);
		event->wIndex = __constant_cpu_to_le16(1);
		event->wLength = __constant_cpu_to_le16(8);

		/* SPEED_CHANGE data is up/down speeds in bits/sec */
		data[0] = data[1] = cpu_to_le32(BITRATE(dev->gadget));

		req->length = STATUS_BYTECOUNT;
		value = usb_ep_queue(ep, req, GFP_ATOMIC);
		debug("send SPEED_CHANGE --> %d\n", value);
		if (value == 0)
			return;
	} else if (value != -ECONNRESET) {
		debug("event %02x --> %d\n",
			event->bNotificationType, value);
		if (event->bNotificationType ==
				USB_CDC_NOTIFY_SPEED_CHANGE) {
			l_ethdev.network_started = 1;
			printf("USB network up!\n");
		}
	}
	req->context = NULL;
}

static void issue_start_status(struct eth_dev *dev)
{
	struct usb_request		*req = dev->stat_req;
	struct usb_cdc_notification	*event;
	int				value;

	/*
	 * flush old status
	 *
	 * FIXME ugly idiom, maybe we'd be better with just
	 * a "cancel the whole queue" primitive since any
	 * unlink-one primitive has way too many error modes.
	 * here, we "know" toggle is already clear...
	 *
	 * FIXME iff req->context != null just dequeue it
	 */
	usb_ep_disable(dev->status_ep);
	usb_ep_enable(dev->status_ep, dev->status);

	/*
	 * 3.8.1 says to issue first NETWORK_CONNECTION, then
	 * a SPEED_CHANGE.  could be useful in some configs.
	 */
	event = req->buf;
	event->bmRequestType = 0xA1;
	event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
	event->wValue = __constant_cpu_to_le16(1);	/* connected */
	event->wIndex = __constant_cpu_to_le16(1);
	event->wLength = 0;

	req->length = sizeof *event;
	req->complete = eth_status_complete;
	req->context = dev;

	value = usb_ep_queue(dev->status_ep, req, GFP_ATOMIC);
	if (value < 0)
		debug("status buf queue --> %d\n", value);
}

#endif

/*-------------------------------------------------------------------------*/

static void eth_setup_complete(struct usb_ep *ep, struct usb_request *req)
{
	if (req->status || req->actual != req->length)
		debug("setup complete --> %d, %d/%d\n",
				req->status, req->actual, req->length);
}

/*
 * The setup() callback implements all the ep0 functionality that's not
 * handled lower down.  CDC has a number of less-common features:
 *
 *  - two interfaces:  control, and ethernet data
 *  - Ethernet data interface has two altsettings:  default, and active
 *  - class-specific descriptors for the control interface
 *  - class-specific control requests
 */
static int
eth_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
{
	struct eth_dev		*dev = get_gadget_data(gadget);
	struct usb_request	*req = dev->req;
	int			value = -EOPNOTSUPP;
	u16			wIndex = le16_to_cpu(ctrl->wIndex);
	u16			wValue = le16_to_cpu(ctrl->wValue);
	u16			wLength = le16_to_cpu(ctrl->wLength);

	/*
	 * descriptors just go into the pre-allocated ep0 buffer,
	 * while config change events may enable network traffic.
	 */

	debug("%s\n", __func__);

	req->complete = eth_setup_complete;
	switch (ctrl->bRequest) {

	case USB_REQ_GET_DESCRIPTOR:
		if (ctrl->bRequestType != USB_DIR_IN)
			break;
		switch (wValue >> 8) {

		case USB_DT_DEVICE:
			value = min(wLength, (u16) sizeof device_desc);
			memcpy(req->buf, &device_desc, value);
			break;
		case USB_DT_DEVICE_QUALIFIER:
			if (!gadget_is_dualspeed(gadget))
				break;
			value = min(wLength, (u16) sizeof dev_qualifier);
			memcpy(req->buf, &dev_qualifier, value);
			break;

		case USB_DT_OTHER_SPEED_CONFIG:
			if (!gadget_is_dualspeed(gadget))
				break;
			/* FALLTHROUGH */
		case USB_DT_CONFIG:
			value = config_buf(gadget, req->buf,
					wValue >> 8,
					wValue & 0xff,
					gadget_is_otg(gadget));
			if (value >= 0)
				value = min(wLength, (u16) value);
			break;

		case USB_DT_STRING:
			value = usb_gadget_get_string(&stringtab,
					wValue & 0xff, req->buf);

			if (value >= 0)
				value = min(wLength, (u16) value);

			break;
		}
		break;

	case USB_REQ_SET_CONFIGURATION:
		if (ctrl->bRequestType != 0)
			break;
		if (gadget->a_hnp_support)
			debug("HNP available\n");
		else if (gadget->a_alt_hnp_support)
			debug("HNP needs a different root port\n");
		value = eth_set_config(dev, wValue, GFP_ATOMIC);
		break;
	case USB_REQ_GET_CONFIGURATION:
		if (ctrl->bRequestType != USB_DIR_IN)
			break;
		*(u8 *)req->buf = dev->config;
		value = min(wLength, (u16) 1);
		break;

	case USB_REQ_SET_INTERFACE:
		if (ctrl->bRequestType != USB_RECIP_INTERFACE
				|| !dev->config
				|| wIndex > 1)
			break;
		if (!cdc_active(dev) && wIndex != 0)
			break;

		/*
		 * PXA hardware partially handles SET_INTERFACE;
		 * we need to kluge around that interference.
		 */
		if (gadget_is_pxa(gadget)) {
			value = eth_set_config(dev, DEV_CONFIG_VALUE,
						GFP_ATOMIC);
			goto done_set_intf;
		}

#ifdef DEV_CONFIG_CDC
		switch (wIndex) {
		case 0:		/* control/master intf */
			if (wValue != 0)
				break;
			if (dev->status) {
				usb_ep_disable(dev->status_ep);
				usb_ep_enable(dev->status_ep, dev->status);
			}
			value = 0;
			break;
		case 1:		/* data intf */
			if (wValue > 1)
				break;
			usb_ep_disable(dev->in_ep);
			usb_ep_disable(dev->out_ep);

			/*
			 * CDC requires the data transfers not be done from
			 * the default interface setting ... also, setting
			 * the non-default interface resets filters etc.
			 */
			if (wValue == 1) {
				if (!cdc_active(dev))
					break;
				usb_ep_enable(dev->in_ep, dev->in);
				usb_ep_enable(dev->out_ep, dev->out);
				dev->cdc_filter = DEFAULT_FILTER;
				if (dev->status)
					issue_start_status(dev);
			}

			value = 0;
			break;
		}
#else
		/*
		 * FIXME this is wrong, as is the assumption that
		 * all non-PXA hardware talks real CDC ...
		 */
		debug("set_interface ignored!\n");
#endif /* DEV_CONFIG_CDC */

done_set_intf:
		break;
	case USB_REQ_GET_INTERFACE:
		if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
				|| !dev->config
				|| wIndex > 1)
			break;
		if (!(cdc_active(dev)) && wIndex != 0)
			break;

		/* for CDC, iff carrier is on, data interface is active. */
		if (wIndex != 1)
			*(u8 *)req->buf = 0;
		else {
			/* *(u8 *)req->buf = netif_carrier_ok (dev->net) ? 1 : 0; */
			/* carrier always ok ...*/
			*(u8 *)req->buf = 1 ;
		}
		value = min(wLength, (u16) 1);
		break;

#ifdef DEV_CONFIG_CDC
	case USB_CDC_SET_ETHERNET_PACKET_FILTER:
		/*
		 * see 6.2.30: no data, wIndex = interface,
		 * wValue = packet filter bitmap
		 */
		if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
				|| !cdc_active(dev)
				|| wLength != 0
				|| wIndex > 1)
			break;
		debug("packet filter %02x\n", wValue);
		dev->cdc_filter = wValue;
		value = 0;
		break;

	/*
	 * and potentially:
	 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
	 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
	 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
	 * case USB_CDC_GET_ETHERNET_STATISTIC:
	 */

#endif /* DEV_CONFIG_CDC */

	default:
		debug("unknown control req%02x.%02x v%04x i%04x l%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			wValue, wIndex, wLength);
	}

	/* respond with data transfer before status phase? */
	if (value >= 0) {
		debug("respond with data transfer before status phase\n");
		req->length = value;
		req->zero = value < wLength
				&& (value % gadget->ep0->maxpacket) == 0;
		value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
		if (value < 0) {
			debug("ep_queue --> %d\n", value);
			req->status = 0;
			eth_setup_complete(gadget->ep0, req);
		}
	}

	/* host either stalls (value < 0) or reports success */
	return value;
}

/*-------------------------------------------------------------------------*/

static void rx_complete(struct usb_ep *ep, struct usb_request *req);

static int rx_submit(struct eth_dev *dev, struct usb_request *req,
				gfp_t gfp_flags)
{
	int			retval = -ENOMEM;
	size_t			size;

	/*
	 * Padding up to RX_EXTRA handles minor disagreements with host.
	 * Normally we use the USB "terminate on short read" convention;
	 * so allow up to (N*maxpacket), since that memory is normally
	 * already allocated.  Some hardware doesn't deal well with short
	 * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
	 * byte off the end (to force hardware errors on overflow).
	 */

	debug("%s\n", __func__);

	size = (ETHER_HDR_SIZE + dev->mtu + RX_EXTRA);
	size += dev->out_ep->maxpacket - 1;
	size -= size % dev->out_ep->maxpacket;

	/*
	 * Some platforms perform better when IP packets are aligned,
	 * but on at least one, checksumming fails otherwise.
	 */

	req->buf = (u8 *) NetRxPackets[0];
	req->length = size;
	req->complete = rx_complete;

	retval = usb_ep_queue(dev->out_ep, req, gfp_flags);

	if (retval)
		error("rx submit --> %d", retval);

	return retval;
}

static void rx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct eth_dev	*dev = ep->driver_data;

	debug("%s: status %d\n", __func__, req->status);

	packet_received = 1;
}

static int alloc_requests(struct eth_dev *dev, unsigned n, gfp_t gfp_flags)
{

	dev->tx_req = usb_ep_alloc_request(dev->in_ep, 0);

	if (!dev->tx_req)
		goto fail1;

	dev->rx_req = usb_ep_alloc_request(dev->out_ep, 0);

	if (!dev->rx_req)
		goto fail2;

	return 0;

fail2:
	usb_ep_free_request(dev->in_ep, dev->tx_req);
fail1:
	error("can't alloc requests");
	return -1;
}

static void tx_complete(struct usb_ep *ep, struct usb_request *req)
{
	debug("%s: status %s\n", __func__, (req->status) ? "failed" : "ok");
	packet_sent = 1;
}

static inline int eth_is_promisc(struct eth_dev *dev)
{
	/* no filters for the CDC subset; always promisc */
	if (subset_active(dev))
		return 1;
	return dev->cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
}

#if 0
static int eth_start_xmit (struct sk_buff *skb, struct net_device *net)
{
	struct eth_dev		*dev = netdev_priv(net);
	int			length = skb->len;
	int			retval;
	struct usb_request	*req = NULL;
	unsigned long		flags;

	/* apply outgoing CDC or RNDIS filters */
	if (!eth_is_promisc (dev)) {
		u8		*dest = skb->data;

		if (is_multicast_ether_addr(dest)) {
			u16	type;

			/* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
			 * SET_ETHERNET_MULTICAST_FILTERS requests
			 */
			if (is_broadcast_ether_addr(dest))
				type = USB_CDC_PACKET_TYPE_BROADCAST;
			else
				type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
			if (!(dev->cdc_filter & type)) {
				dev_kfree_skb_any (skb);
				return 0;
			}
		}
		/* ignores USB_CDC_PACKET_TYPE_DIRECTED */
	}

	spin_lock_irqsave(&dev->req_lock, flags);
	/*
	 * this freelist can be empty if an interrupt triggered disconnect()
	 * and reconfigured the gadget (shutting down this queue) after the
	 * network stack decided to xmit but before we got the spinlock.
	 */
	if (list_empty(&dev->tx_reqs)) {
		spin_unlock_irqrestore(&dev->req_lock, flags);
		return 1;
	}

	req = container_of (dev->tx_reqs.next, struct usb_request, list);
	list_del (&req->list);

	/* temporarily stop TX queue when the freelist empties */
	if (list_empty (&dev->tx_reqs))
		netif_stop_queue (net);
	spin_unlock_irqrestore(&dev->req_lock, flags);

	/* no buffer copies needed, unless the network stack did it
	 * or the hardware can't use skb buffers.
	 * or there's not enough space for any RNDIS headers we need
	 */
	if (rndis_active(dev)) {
		struct sk_buff	*skb_rndis;

		skb_rndis = skb_realloc_headroom (skb,
				sizeof (struct rndis_packet_msg_type));
		if (!skb_rndis)
			goto drop;

		dev_kfree_skb_any (skb);
		skb = skb_rndis;
		rndis_add_hdr (skb);
		length = skb->len;
	}
	req->buf = skb->data;
	req->context = skb;
	req->complete = tx_complete;

	/* use zlp framing on tx for strict CDC-Ether conformance,
	 * though any robust network rx path ignores extra padding.
	 * and some hardware doesn't like to write zlps.
	 */
	req->zero = 1;
	if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
		length++;

	req->length = length;

	/* throttle highspeed IRQ rate back slightly */
	if (gadget_is_dualspeed(dev->gadget))
		req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
			? ((atomic_read(&dev->tx_qlen) % qmult) != 0)
			: 0;

	retval = usb_ep_queue (dev->in_ep, req, GFP_ATOMIC);
	switch (retval) {
	default:
		DEBUG (dev, "tx queue err %d\n", retval);
		break;
	case 0:
		net->trans_start = jiffies;
		atomic_inc (&dev->tx_qlen);
	}

	if (retval) {
drop:
		dev->stats.tx_dropped++;
		dev_kfree_skb_any (skb);
		spin_lock_irqsave(&dev->req_lock, flags);
		if (list_empty (&dev->tx_reqs))
			netif_start_queue (net);
		list_add (&req->list, &dev->tx_reqs);
		spin_unlock_irqrestore(&dev->req_lock, flags);
	}
	return 0;
}

/*-------------------------------------------------------------------------*/
#endif

static void eth_unbind(struct usb_gadget *gadget)
{
	struct eth_dev *dev = get_gadget_data(gadget);

	debug("%s...\n", __func__);

	/* we've already been disconnected ... no i/o is active */
	if (dev->req) {
		usb_ep_free_request(gadget->ep0, dev->req);
		dev->req = NULL;
	}
	if (dev->stat_req) {
		usb_ep_free_request(dev->status_ep, dev->stat_req);
		dev->stat_req = NULL;
	}

	if (dev->tx_req) {
		usb_ep_free_request(dev->in_ep, dev->tx_req);
		dev->tx_req = NULL;
	}

	if (dev->rx_req) {
		usb_ep_free_request(dev->out_ep, dev->rx_req);
		dev->rx_req = NULL;
	}

/*	unregister_netdev (dev->net);*/
/*	free_netdev(dev->net);*/

	set_gadget_data(gadget, NULL);
}

static void eth_disconnect(struct usb_gadget *gadget)
{
	eth_reset_config(get_gadget_data(gadget));
}

static void eth_suspend(struct usb_gadget *gadget)
{
	/* Not used */
}

static void eth_resume(struct usb_gadget *gadget)
{
	/* Not used */
}

/*-------------------------------------------------------------------------*/

static int is_eth_addr_valid(char *str)
{
	if (strlen(str) == 17) {
		int i;
		char *p, *q;
		uchar ea[6];

		/* see if it looks like an ethernet address */

		p = str;

		for (i = 0; i < 6; i++) {
			char term = (i == 5 ? '\0' : ':');

			ea[i] = simple_strtol(p, &q, 16);

			if ((q - p) != 2 || *q++ != term)
				break;

			p = q;
		}

		if (i == 6) /* it looks ok */
			return 1;
	}
	return 0;
}

static u8 nibble(unsigned char c)
{
	if (likely(isdigit(c)))
		return c - '0';
	c = toupper(c);
	if (likely(isxdigit(c)))
		return 10 + c - 'A';
	return 0;
}

static int get_ether_addr(const char *str, u8 *dev_addr)
{
	if (str) {
		unsigned	i;

		for (i = 0; i < 6; i++) {
			unsigned char num;

			if ((*str == '.') || (*str == ':'))
				str++;
			num = nibble(*str++) << 4;
			num |= (nibble(*str++));
			dev_addr[i] = num;
		}
		if (is_valid_ether_addr(dev_addr))
			return 0;
	}
	return 1;
}

static int eth_bind(struct usb_gadget *gadget)
{
	struct eth_dev		*dev = &l_ethdev;
	u8			cdc = 1, zlp = 1;
	struct usb_ep		*in_ep, *out_ep, *status_ep = NULL;
	int			gcnum;
	u8			tmp[7];

	/* these flags are only ever cleared; compiler take note */
#ifndef	DEV_CONFIG_CDC
	cdc = 0;
#endif
	/*
	 * Because most host side USB stacks handle CDC Ethernet, that
	 * standard protocol is _strongly_ preferred for interop purposes.
	 * (By everyone except Microsoft.)
	 */
	if (gadget_is_pxa(gadget)) {
		/* pxa doesn't support altsettings */
		cdc = 0;
	} else if (gadget_is_musbhdrc(gadget)) {
		/* reduce tx dma overhead by avoiding special cases */
		zlp = 0;
	} else if (gadget_is_sh(gadget)) {
		/* sh doesn't support multiple interfaces or configs */
		cdc = 0;
	} else if (gadget_is_sa1100(gadget)) {
		/* hardware can't write zlps */
		zlp = 0;
		/*
		 * sa1100 CAN do CDC, without status endpoint ... we use
		 * non-CDC to be compatible with ARM Linux-2.4 "usb-eth".
		 */
		cdc = 0;
	}

	gcnum = usb_gadget_controller_number(gadget);
	if (gcnum >= 0)
		device_desc.bcdDevice = cpu_to_le16(0x0300 + gcnum);
	else {
		/*
		 * can't assume CDC works.  don't want to default to
		 * anything less functional on CDC-capable hardware,
		 * so we fail in this case.
		 */
		error("controller '%s' not recognized",
			gadget->name);
		return -ENODEV;
	}

	/*
	 * CDC subset ... recognized by Linux since 2.4.10, but Windows
	 * drivers aren't widely available.  (That may be improved by
	 * supporting one submode of the "SAFE" variant of MDLM.)
	 */
	if (!cdc) {
		device_desc.idVendor =
			__constant_cpu_to_le16(SIMPLE_VENDOR_NUM);
		device_desc.idProduct =
			__constant_cpu_to_le16(SIMPLE_PRODUCT_NUM);
	}

	/* support optional vendor/distro customization */
#if defined(CONFIG_USB_CDC_VENDOR_ID) && defined(CONFIG_USB_CDC_PRODUCT_ID)
	device_desc.idVendor = cpu_to_le16(CONFIG_USB_CDC_VENDOR_ID);
	device_desc.idProduct = cpu_to_le16(CONFIG_USB_CDC_PRODUCT_ID);
#endif
	if (bcdDevice)
		device_desc.bcdDevice = cpu_to_le16(bcdDevice);
	if (iManufacturer)
		strlcpy(manufacturer, iManufacturer, sizeof manufacturer);
	if (iProduct)
		strlcpy(product_desc, iProduct, sizeof product_desc);
	if (iSerialNumber) {
		device_desc.iSerialNumber = STRING_SERIALNUMBER,
		strlcpy(serial_number, iSerialNumber, sizeof serial_number);
	}

	/* all we really need is bulk IN/OUT */
	usb_ep_autoconfig_reset(gadget);
	in_ep = usb_ep_autoconfig(gadget, &fs_source_desc);
	if (!in_ep) {
autoconf_fail:
		error("can't autoconfigure on %s\n",
			gadget->name);
		return -ENODEV;
	}
	in_ep->driver_data = in_ep;	/* claim */

	out_ep = usb_ep_autoconfig(gadget, &fs_sink_desc);
	if (!out_ep)
		goto autoconf_fail;
	out_ep->driver_data = out_ep;	/* claim */

#if defined(DEV_CONFIG_CDC)
	/*
	 * CDC Ethernet control interface doesn't require a status endpoint.
	 * Since some hosts expect one, try to allocate one anyway.
	 */
	if (cdc) {
		status_ep = usb_ep_autoconfig(gadget, &fs_status_desc);
		if (status_ep) {
			status_ep->driver_data = status_ep;	/* claim */
		} else if (cdc) {
			control_intf.bNumEndpoints = 0;
			/* FIXME remove endpoint from descriptor list */
		}
	}
#endif

	/* one config:  cdc, else minimal subset */
	if (!cdc) {
		eth_config.bNumInterfaces = 1;
		eth_config.iConfiguration = STRING_SUBSET;

		/*
		 * use functions to set these up, in case we're built to work
		 * with multiple controllers and must override CDC Ethernet.
		 */
		fs_subset_descriptors();
		hs_subset_descriptors();
	}

	device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
	usb_gadget_set_selfpowered(gadget);

	if (gadget_is_dualspeed(gadget)) {
		if (!cdc)
			dev_qualifier.bDeviceClass = USB_CLASS_VENDOR_SPEC;

		/* assumes ep0 uses the same value for both speeds ... */
		dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;

		/* and that all endpoints are dual-speed */
		hs_source_desc.bEndpointAddress =
				fs_source_desc.bEndpointAddress;
		hs_sink_desc.bEndpointAddress =
				fs_sink_desc.bEndpointAddress;
#if defined(DEV_CONFIG_CDC)
		if (status_ep)
			hs_status_desc.bEndpointAddress =
					fs_status_desc.bEndpointAddress;
#endif
	}

	if (gadget_is_otg(gadget)) {
		otg_descriptor.bmAttributes |= USB_OTG_HNP,
		eth_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
		eth_config.bMaxPower = 4;
	}

	dev->net = &l_netdev;
	strcpy(dev->net->name, USB_NET_NAME);

	dev->cdc = cdc;
	dev->zlp = zlp;

	dev->in_ep = in_ep;
	dev->out_ep = out_ep;
	dev->status_ep = status_ep;

	/*
	 * Module params for these addresses should come from ID proms.
	 * The host side address is used with CDC, and commonly
	 * ends up in a persistent config database.  It's not clear if
	 * host side code for the SAFE thing cares -- its original BLAN
	 * thing didn't, Sharp never assigned those addresses on Zaurii.
	 */
	get_ether_addr(dev_addr, dev->net->enetaddr);

	memset(tmp, 0, sizeof(tmp));
	memcpy(tmp, dev->net->enetaddr, sizeof(dev->net->enetaddr));

	get_ether_addr(host_addr, dev->host_mac);

	sprintf(ethaddr, "%02X%02X%02X%02X%02X%02X",
		dev->host_mac[0], dev->host_mac[1],
			dev->host_mac[2], dev->host_mac[3],
			dev->host_mac[4], dev->host_mac[5]);

	printf("using %s, OUT %s IN %s%s%s\n", gadget->name,
		out_ep->name, in_ep->name,
		status_ep ? " STATUS " : "",
		status_ep ? status_ep->name : ""
		);
	printf("MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
		dev->net->enetaddr[0], dev->net->enetaddr[1],
		dev->net->enetaddr[2], dev->net->enetaddr[3],
		dev->net->enetaddr[4], dev->net->enetaddr[5]);

	if (cdc) {
		printf("HOST MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
			dev->host_mac[0], dev->host_mac[1],
			dev->host_mac[2], dev->host_mac[3],
			dev->host_mac[4], dev->host_mac[5]);
	}

	/*
	 * use PKTSIZE (or aligned... from u-boot) and set
	 * wMaxSegmentSize accordingly
	 */
	dev->mtu = PKTSIZE_ALIGN; /* RNDIS does not like this, only 1514, TODO*/

	/* preallocate control message data and buffer */
	dev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL);
	if (!dev->req)
		goto fail;
	dev->req->buf = control_req;
	dev->req->complete = eth_setup_complete;

	/* ... and maybe likewise for status transfer */
#if defined(DEV_CONFIG_CDC)
	if (dev->status_ep) {
		dev->stat_req = usb_ep_alloc_request(dev->status_ep,
							GFP_KERNEL);
		if (!dev->stat_req) {
			usb_ep_free_request(dev->status_ep, dev->req);

			goto fail;
		}
		dev->stat_req->buf = status_req;
		dev->stat_req->context = NULL;
	}
#endif

	/* finish hookup to lower layer ... */
	dev->gadget = gadget;
	set_gadget_data(gadget, dev);
	gadget->ep0->driver_data = dev;

	/*
	 * two kinds of host-initiated state changes:
	 *  - iff DATA transfer is active, carrier is "on"
	 *  - tx queueing enabled if open *and* carrier is "on"
	 */
	return 0;

fail:
	error("%s failed", __func__);
	eth_unbind(gadget);
	return -ENOMEM;
}

static int usb_eth_init(struct eth_device *netdev, bd_t *bd)
{
	struct eth_dev *dev = &l_ethdev;
	struct usb_gadget *gadget;
	unsigned long ts;
	unsigned long timeout = USB_CONNECT_TIMEOUT;

	if (!netdev) {
		error("received NULL ptr");
		goto fail;
	}

	dev->network_started = 0;

	packet_received = 0;
	packet_sent = 0;

	gadget = dev->gadget;
	usb_gadget_connect(gadget);

	if (getenv("cdc_connect_timeout"))
		timeout = simple_strtoul(getenv("cdc_connect_timeout"),
						NULL, 10) * CONFIG_SYS_HZ;
	ts = get_timer(0);
	while (!l_ethdev.network_started) {
		/* Handle control-c and timeouts */
		if (ctrlc() || (get_timer(ts) > timeout)) {
			error("The remote end did not respond in time.");
			goto fail;
		}
		usb_gadget_handle_interrupts();
	}

	packet_received = 0;
	rx_submit(dev, dev->rx_req, 0);
	return 0;
fail:
	return -1;
}

static int usb_eth_send(struct eth_device *netdev,
			volatile void *packet, int length)
{
	int			retval;
	struct eth_dev		*dev = &l_ethdev;
	struct usb_request	*req = dev->tx_req;
	unsigned long ts;
	unsigned long timeout = USB_CONNECT_TIMEOUT;

	debug("%s:...\n", __func__);

	req->buf = (void *)packet;
	req->context = NULL;
	req->complete = tx_complete;

	/*
	 * use zlp framing on tx for strict CDC-Ether conformance,
	 * though any robust network rx path ignores extra padding.
	 * and some hardware doesn't like to write zlps.
	 */
	req->zero = 1;
	if (!dev->zlp && (length % dev->in_ep->maxpacket) == 0)
		length++;

	req->length = length;
#if 0
	/* throttle highspeed IRQ rate back slightly */
	if (gadget_is_dualspeed(dev->gadget))
		req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
			? ((dev->tx_qlen % qmult) != 0) : 0;
#endif
	dev->tx_qlen = 1;
	ts = get_timer(0);
	packet_sent = 0;

	retval = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);

	if (!retval)
		debug("%s: packet queued\n", __func__);
	while (!packet_sent) {
		if (get_timer(ts) > timeout) {
			printf("timeout sending packets to usb ethernet\n");
			return -1;
		}
		usb_gadget_handle_interrupts();
	}

	return 0;
}

static int usb_eth_recv(struct eth_device *netdev)
{
	struct eth_dev *dev = &l_ethdev;

	usb_gadget_handle_interrupts();

	if (packet_received) {
		debug("%s: packet received\n", __func__);
		if (dev->rx_req) {
			NetReceive(NetRxPackets[0], dev->rx_req->length);
			packet_received = 0;

			rx_submit(dev, dev->rx_req, 0);
		} else
			error("dev->rx_req invalid");
	}
	return 0;
}

void usb_eth_halt(struct eth_device *netdev)
{
	struct eth_dev *dev = &l_ethdev;

	if (!netdev) {
		error("received NULL ptr");
		return;
	}

	usb_gadget_disconnect(dev->gadget);
}

static struct usb_gadget_driver eth_driver = {
	.speed		= DEVSPEED,

	.bind		= eth_bind,
	.unbind		= eth_unbind,

	.setup		= eth_setup,
	.disconnect	= eth_disconnect,

	.suspend	= eth_suspend,
	.resume		= eth_resume,
};

int usb_eth_initialize(bd_t *bi)
{
	int status = 0;
	struct eth_device *netdev = &l_netdev;

	sprintf(netdev->name, "usb_ether");

	netdev->init = usb_eth_init;
	netdev->send = usb_eth_send;
	netdev->recv = usb_eth_recv;
	netdev->halt = usb_eth_halt;

#ifdef CONFIG_MCAST_TFTP
  #error not supported
#endif
	/* Configure default mac-addresses for the USB ethernet device */
#ifdef CONFIG_USBNET_DEV_ADDR
	strncpy(dev_addr, CONFIG_USBNET_DEV_ADDR, sizeof(dev_addr));
#endif
#ifdef CONFIG_USBNET_HOST_ADDR
	strncpy(host_addr, CONFIG_USBNET_HOST_ADDR, sizeof(host_addr));
#endif
	/* Check if the user overruled the MAC addresses */
	if (getenv("usbnet_devaddr"))
		strncpy(dev_addr, getenv("usbnet_devaddr"),
			sizeof(dev_addr));

	if (getenv("usbnet_hostaddr"))
		strncpy(host_addr, getenv("usbnet_hostaddr"),
			sizeof(host_addr));

	/* Make sure both strings are terminated */
	dev_addr[sizeof(dev_addr)-1] = '\0';
	host_addr[sizeof(host_addr)-1] = '\0';

	if (!is_eth_addr_valid(dev_addr)) {
		error("Need valid 'usbnet_devaddr' to be set");
		status = -1;
	}
	if (!is_eth_addr_valid(host_addr)) {
		error("Need valid 'usbnet_hostaddr' to be set");
		status = -1;
	}
	if (status)
		goto fail;

	status = usb_gadget_register_driver(&eth_driver);
	if (status < 0)
		goto fail;

	eth_register(netdev);
	return 0;

fail:
	error("%s failed. error = %d", __func__, status);
	return status;
}