Bootlin

Embedded Linux Experts

   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
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
/*
 * ether.c -- Ethernet gadget driver, with CDC and non-CDC options
 *
 * Copyright (C) 2003-2005 David Brownell
 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
 *
 * 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
 */


// #define DEBUG 1
// #define VERBOSE

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/ctype.h>

#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

#include <linux/usb_ch9.h>
#include <linux/usb_cdc.h>
#include <linux/usb_gadget.h>

#include <linux/random.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>

#include "gadget_chips.h"

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

/*
 * 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.
 *
 * There's some hardware that can't talk CDC.  We make that hardware
 * implement a "minimalist" vendor-agnostic CDC core:  same framing, but
 * link-level setup only requires activating the configuration.
 * Linux supports it, but other host operating systems may not.
 * (This is a subset of CDC Ethernet.)
 *
 * 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.
 */

#define DRIVER_DESC		"Ethernet Gadget"
#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 */

#include "rndis.h"

#ifndef	CONFIG_USB_ETH_RNDIS
#define rndis_uninit(x)		do{}while(0)
#define rndis_deregister(c)	do{}while(0)
#define rndis_exit()		do{}while(0)
#endif

/* CDC and RNDIS 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)


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

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

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

	struct net_device	*net;
	struct net_device_stats	stats;
	atomic_t		tx_qlen;

	struct work_struct	work;
	unsigned		zlp:1;
	unsigned		cdc:1;
	unsigned		rndis:1;
	unsigned		suspended:1;
	u16			cdc_filter;
	unsigned long		todo;
#define	WORK_RX_MEMORY		0
	int			rndis_config;
	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

/* For hardware that can talk RNDIS and either of the above protocols,
 * use this ID ... the windows INF files will know it.  Unless it's
 * used with CDC Ethernet, Linux 2.4 hosts will need updates to choose
 * the non-RNDIS configuration.
 */
#define RNDIS_VENDOR_NUM	0x0525	/* NetChip */
#define RNDIS_PRODUCT_NUM	0xa4a2	/* Ethernet/RNDIS Gadget */


/* 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 __initdata idVendor;
module_param(idVendor, ushort, S_IRUGO);
MODULE_PARM_DESC(idVendor, "USB Vendor ID");

static ushort __initdata idProduct;
module_param(idProduct, ushort, S_IRUGO);
MODULE_PARM_DESC(idProduct, "USB Product ID");

static ushort __initdata bcdDevice;
module_param(bcdDevice, ushort, S_IRUGO);
MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)");

static char *__initdata iManufacturer;
module_param(iManufacturer, charp, S_IRUGO);
MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string");

static char *__initdata iProduct;
module_param(iProduct, charp, S_IRUGO);
MODULE_PARM_DESC(iProduct, "USB Product string");

/* initial value, changed by "ifconfig usb0 hw ether xx:xx:xx:xx:xx:xx" */
static char *__initdata dev_addr;
module_param(dev_addr, charp, S_IRUGO);
MODULE_PARM_DESC(dev_addr, "Device Ethernet Address");

/* this address is invisible to ifconfig */
static char *__initdata host_addr;
module_param(host_addr, charp, S_IRUGO);
MODULE_PARM_DESC(host_addr, "Host Ethernet Address");


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

/* Include CDC support if we could run on CDC-capable hardware. */

#ifdef CONFIG_USB_GADGET_NET2280
#define	DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_DUMMY_HCD
#define	DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_GOKU
#define	DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_LH7A40X
#define DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_MQ11XX
#define	DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_OMAP
#define	DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_N9604
#define	DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_PXA27X
#define DEV_CONFIG_CDC
#endif

#ifdef CONFIG_USB_GADGET_AT91
#define DEV_CONFIG_CDC
#endif


/* For CDC-incapable hardware, choose the simple cdc subset.
 * Anything that talks bulk (without notable bugs) can do this.
 */
#ifdef CONFIG_USB_GADGET_PXA2XX
#define	DEV_CONFIG_SUBSET
#endif

#ifdef CONFIG_USB_GADGET_SH
#define	DEV_CONFIG_SUBSET
#endif

#ifdef CONFIG_USB_GADGET_SA1100
/* use non-CDC for backwards compatibility */
#define	DEV_CONFIG_SUBSET
#endif

#ifdef CONFIG_USB_GADGET_S3C2410
#define DEV_CONFIG_CDC
#endif

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

/* "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
}

/* "secondary" RNDIS config may sometimes be activated */
static inline int rndis_active(struct eth_dev *dev)
{
#ifdef	CONFIG_USB_ETH_RNDIS
	return dev->rndis;
#else
	return 0;
#endif
}

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

static unsigned qmult = 5;
module_param (qmult, uint, S_IRUGO|S_IWUSR);


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

/* also defer IRQs on highspeed TX */
#define TX_DELAY	qmult

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	DEVSPEED	USB_SPEED_FULL

#define qlen(gadget) DEFAULT_QLEN

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


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

#define xprintk(d,level,fmt,args...) \
	printk(level "%s: " fmt , (d)->net->name , ## args)

#ifdef DEBUG
#undef DEBUG
#define DEBUG(dev,fmt,args...) \
	xprintk(dev , KERN_DEBUG , fmt , ## args)
#else
#define DEBUG(dev,fmt,args...) \
	do { } while (0)
#endif /* DEBUG */

#ifdef VERBOSE
#define VDEBUG	DEBUG
#else
#define VDEBUG(dev,fmt,args...) \
	do { } while (0)
#endif /* DEBUG */

#define ERROR(dev,fmt,args...) \
	xprintk(dev , KERN_ERR , fmt , ## args)
#define WARN(dev,fmt,args...) \
	xprintk(dev , KERN_WARNING , fmt , ## args)
#define INFO(dev,fmt,args...) \
	xprintk(dev , KERN_INFO , fmt , ## args)

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

/* 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, with RNDIS as an optional second configuration.
 *
 * RNDIS includes some CDC ACM descriptors ... like CDC Ethernet.  But
 * the class descriptors match a modem (they're ignored; it's really just
 * Ethernet functionality), they don't need the NOP altsetting, and the
 * status transfer endpoint isn't optional.
 */

#define STRING_MANUFACTURER		1
#define STRING_PRODUCT			2
#define STRING_ETHADDR			3
#define STRING_DATA			4
#define STRING_CONTROL			5
#define STRING_RNDIS_CONTROL		6
#define STRING_CDC			7
#define STRING_SUBSET			8
#define STRING_RNDIS			9

/* holds our biggest descriptor (or RNDIS response) */
#define USB_BUFSIZ	256

/*
 * This device advertises one configuration, eth_config, unless RNDIS
 * is enabled (rndis_config) on hardware supporting at least two configs.
 *
 * NOTE:  Controllers like superh_udc should probably be able to use
 * an RNDIS-only configuration.
 *
 * FIXME define some higher-powered configurations to make it easier
 * to recharge batteries ...
 */

#define DEV_CONFIG_VALUE	1	/* cdc or subset */
#define DEV_RNDIS_CONFIG_VALUE	2	/* rndis; optional */

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 =		50,
};

#ifdef	CONFIG_USB_ETH_RNDIS
static struct usb_config_descriptor 
rndis_config = {
	.bLength =              sizeof rndis_config,
	.bDescriptorType =      USB_DT_CONFIG,

	/* compute wTotalLength on the fly */
	.bNumInterfaces =       2,
	.bConfigurationValue =  DEV_RNDIS_CONFIG_VALUE,
	.iConfiguration =       STRING_RNDIS,
	.bmAttributes =		USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
	.bMaxPower =            50,
};
#endif

/*
 * 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.
 *
 * RNDIS shares a lot with CDC-Ethernet, since it's a variant of
 * the CDC-ACM (modem) spec.
 */

#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

#ifdef	CONFIG_USB_ETH_RNDIS
static const struct usb_interface_descriptor
rndis_control_intf = {
	.bLength =              sizeof rndis_control_intf,
	.bDescriptorType =      USB_DT_INTERFACE,
	  
	.bInterfaceNumber =     0,
	.bNumEndpoints =        1,
	.bInterfaceClass =      USB_CLASS_COMM,
	.bInterfaceSubClass =   USB_CDC_SUBCLASS_ACM,
	.bInterfaceProtocol =   USB_CDC_ACM_PROTO_VENDOR,
	.iInterface =           STRING_RNDIS_CONTROL,
};
#endif

#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)

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),
};

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 || RNDIS */

#ifdef	CONFIG_USB_ETH_RNDIS

static const struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
	.bLength =  		sizeof call_mgmt_descriptor,
	.bDescriptorType = 	USB_DT_CS_INTERFACE,
	.bDescriptorSubType = 	USB_CDC_CALL_MANAGEMENT_TYPE,

	.bmCapabilities = 	0x00,
	.bDataInterface = 	0x01,
};

static const struct usb_cdc_acm_descriptor acm_descriptor = {
	.bLength =  		sizeof acm_descriptor,
	.bDescriptorType = 	USB_DT_CS_INTERFACE,
	.bDescriptorSubType = 	USB_CDC_ACM_TYPE,

	.bmCapabilities = 	0x00,
};

#endif

#ifdef	DEV_CONFIG_CDC

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,
};

#endif

#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)

/* 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).
 *
 * RNDIS requires the status endpoint, since it uses that encapsulation
 * mechanism for its funky RPC scheme.
 */
 
#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	CONFIG_USB_ETH_RNDIS

/* RNDIS doesn't activate by changing to the "real" altsetting */

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

	.bInterfaceNumber =	1,
	.bAlternateSetting =	0,
	.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.
 */

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_VENDOR_SPEC,
	.bInterfaceSubClass =	0,
	.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 __init fs_subset_descriptors(void)
{
#ifdef DEV_CONFIG_SUBSET
	fs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
	fs_eth_function[2] = (struct usb_descriptor_header *) &fs_source_desc;
	fs_eth_function[3] = (struct usb_descriptor_header *) &fs_sink_desc;
	fs_eth_function[4] = NULL;
#else
	fs_eth_function[1] = NULL;
#endif
}

#ifdef	CONFIG_USB_ETH_RNDIS
static const struct usb_descriptor_header *fs_rndis_function [] = {
	(struct usb_descriptor_header *) &otg_descriptor,
	/* control interface matches ACM, not Ethernet */
	(struct usb_descriptor_header *) &rndis_control_intf,
	(struct usb_descriptor_header *) &header_desc,
	(struct usb_descriptor_header *) &call_mgmt_descriptor,
	(struct usb_descriptor_header *) &acm_descriptor,
	(struct usb_descriptor_header *) &union_desc,
	(struct usb_descriptor_header *) &fs_status_desc,
	/* data interface has no altsetting */
	(struct usb_descriptor_header *) &rndis_data_intf,
	(struct usb_descriptor_header *) &fs_source_desc,
	(struct usb_descriptor_header *) &fs_sink_desc,
	NULL,
};
#endif

#ifdef	CONFIG_USB_GADGET_DUALSPEED

/*
 * 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) || defined(CONFIG_USB_ETH_RNDIS)
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 __init hs_subset_descriptors(void)
{
#ifdef DEV_CONFIG_SUBSET
	hs_eth_function[1] = (struct usb_descriptor_header *) &subset_data_intf;
	hs_eth_function[2] = (struct usb_descriptor_header *) &fs_source_desc;
	hs_eth_function[3] = (struct usb_descriptor_header *) &fs_sink_desc;
	hs_eth_function[4] = NULL;
#else
	hs_eth_function[1] = NULL;
#endif
}

#ifdef	CONFIG_USB_ETH_RNDIS
static const struct usb_descriptor_header *hs_rndis_function [] = {
	(struct usb_descriptor_header *) &otg_descriptor,
	/* control interface matches ACM, not Ethernet */
	(struct usb_descriptor_header *) &rndis_control_intf,
	(struct usb_descriptor_header *) &header_desc,
	(struct usb_descriptor_header *) &call_mgmt_descriptor,
	(struct usb_descriptor_header *) &acm_descriptor,
	(struct usb_descriptor_header *) &union_desc,
	(struct usb_descriptor_header *) &hs_status_desc,
	/* data interface has no altsetting */
	(struct usb_descriptor_header *) &rndis_data_intf,
	(struct usb_descriptor_header *) &hs_source_desc,
	(struct usb_descriptor_header *) &hs_sink_desc,
	NULL,
};
#endif


/* maxpacket and other transfer characteristics vary by speed. */
#define ep_desc(g,hs,fs) (((g)->speed==USB_SPEED_HIGH)?(hs):(fs))

#else

/* if there's no high speed support, maxpacket doesn't change. */
#define ep_desc(g,hs,fs) (((void)(g)), (fs))

static inline void __init hs_subset_descriptors(void)
{
}

#endif	/* !CONFIG_USB_GADGET_DUALSPEED */

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

/* descriptors that are built on-demand */

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

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

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

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

/*
 * one config, two interfaces:  control, data.
 * complications: class descriptors, and an altsetting.
 */
static int
config_buf (enum usb_device_speed speed,
	u8 *buf, u8 type,
	unsigned index, int is_otg)
{
	int					len;
	const struct usb_config_descriptor	*config;
	const struct usb_descriptor_header	**function;
#ifdef CONFIG_USB_GADGET_DUALSPEED
	int				hs = (speed == USB_SPEED_HIGH);

	if (type == USB_DT_OTHER_SPEED_CONFIG)
		hs = !hs;
#define which_fn(t)	(hs ? hs_ ## t ## _function : fs_ ## t ## _function)
#else
#define	which_fn(t)	(fs_ ## t ## _function)
#endif

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

#ifdef	CONFIG_USB_ETH_RNDIS
	/* list the RNDIS config first, to make Microsoft's drivers
	 * happy. DOCSIS 1.0 needs this too.
	 */
	if (device_desc.bNumConfigurations == 2 && index == 0) {
		config = &rndis_config;
		function = which_fn (rndis);
	} else
#endif
	{
		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 void eth_start (struct eth_dev *dev, unsigned gfp_flags);
static int alloc_requests (struct eth_dev *dev, unsigned n, unsigned gfp_flags);

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

#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
	/* status endpoint used for RNDIS and (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 (dev, "enable %s --> %d\n", 
				dev->status_ep->name, result);
			goto done;
		}
	}
#endif

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

	dev->out = ep_desc (dev->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.
	 *
	 * Strictly speaking RNDIS should work the same: activation is
	 * a side effect of setting a packet filter.  Deactivation is
	 * from REMOTE_NDIS_HALT_MSG, reset from REMOTE_NDIS_RESET_MSG.
	 */
	if (!cdc_active(dev)) {
		result = usb_ep_enable (dev->in_ep, dev->in);
		if (result != 0) {
			DEBUG(dev, "enable %s --> %d\n", 
				dev->in_ep->name, result);
			goto done;
		}

		result = usb_ep_enable (dev->out_ep, dev->out);
		if (result != 0) {
			DEBUG (dev, "enable %s --> %d\n", 
				dev->in_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))
			(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;
	} else

	/* activate non-CDC configs right away
	 * this isn't strictly according to the RNDIS spec
	 */
	if (!cdc_active (dev)) {
		netif_carrier_on (dev->net);
		if (netif_running (dev->net)) {
			spin_unlock (&dev->lock);
			eth_start (dev, GFP_ATOMIC);
			spin_lock (&dev->lock);
		}
	}

	if (result == 0)
		DEBUG (dev, "qlen %d\n", qlen (gadget));

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

static void eth_reset_config (struct eth_dev *dev)
{
	struct usb_request	*req;

	if (dev->config == 0)
		return;

	DEBUG (dev, "%s\n", __FUNCTION__);

	netif_stop_queue (dev->net);
	netif_carrier_off (dev->net);
	rndis_uninit(dev->rndis_config);

	/* disable endpoints, forcing (synchronous) completion of
	 * pending i/o.  then free the requests.
	 */
	if (dev->in) {
		usb_ep_disable (dev->in_ep);
		while (likely (!list_empty (&dev->tx_reqs))) {
			req = container_of (dev->tx_reqs.next,
						struct usb_request, list);
			list_del (&req->list);
			usb_ep_free_request (dev->in_ep, req);
		}
	}
	if (dev->out) {
		usb_ep_disable (dev->out_ep);
		while (likely (!list_empty (&dev->rx_reqs))) {
			req = container_of (dev->rx_reqs.next,
						struct usb_request, list);
			list_del (&req->list);
			usb_ep_free_request (dev->out_ep, req);
		}
	}

	if (dev->status) {
		usb_ep_disable (dev->status_ep);
	}
	dev->rndis = 0;
	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, unsigned gfp_flags)
{
	int			result = 0;
	struct usb_gadget	*gadget = dev->gadget;

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

	switch (number) {
	case DEV_CONFIG_VALUE:
		result = set_ether_config (dev, gfp_flags);
		break;
#ifdef	CONFIG_USB_ETH_RNDIS
	case DEV_RNDIS_CONFIG_VALUE:
		dev->rndis = 1;
		result = set_ether_config (dev, gfp_flags);
		break;
#endif
	default:
		result = -EINVAL;
		/* FALL THROUGH */
	case 0:
		break;
	}

	if (result) {
		if (number)
			eth_reset_config (dev);
		usb_gadget_vbus_draw(dev->gadget,
				dev->gadget->is_otg ? 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;
		INFO (dev, "%s speed config #%d: %d mA, %s, using %s\n",
				speed, number, power, driver_desc,
				rndis_active(dev)
					? "RNDIS"
					: (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 (as used in RNDIS).  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 (dev, "send SPEED_CHANGE --> %d\n", value);
		if (value == 0)
			return;
	} else if (value != -ECONNRESET)
		DEBUG (dev, "event %02x --> %d\n",
			event->bNotificationType, value);
	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;
 
	DEBUG (dev, "%s, flush old status first\n", __FUNCTION__);

	/* 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 (dev, "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 ((struct eth_dev *) ep->driver_data,
				"setup complete --> %d, %d/%d\n",
				req->status, req->actual, req->length);
}

#ifdef CONFIG_USB_ETH_RNDIS

static void rndis_response_complete (struct usb_ep *ep, struct usb_request *req)
{
	if (req->status || req->actual != req->length)
		DEBUG ((struct eth_dev *) ep->driver_data,
			"rndis response complete --> %d, %d/%d\n",
			req->status, req->actual, req->length);

	/* done sending after USB_CDC_GET_ENCAPSULATED_RESPONSE */
}

static void rndis_command_complete (struct usb_ep *ep, struct usb_request *req)
{
	struct eth_dev          *dev = ep->driver_data;
	int			status;
	
	/* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
	spin_lock(&dev->lock);
	status = rndis_msg_parser (dev->rndis_config, (u8 *) req->buf);
	if (status < 0)
		ERROR(dev, "%s: rndis parse error %d\n", __FUNCTION__, status);
	spin_unlock(&dev->lock);
}

#endif	/* RNDIS */

/*
 * 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.
	 */
	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;
#ifdef CONFIG_USB_GADGET_DUALSPEED
		case USB_DT_DEVICE_QUALIFIER:
			if (!gadget->is_dualspeed)
				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)
				break;
			// FALLTHROUGH
#endif /* CONFIG_USB_GADGET_DUALSPEED */
		case USB_DT_CONFIG:
			value = config_buf (gadget->speed, req->buf,
					wValue >> 8,
					wValue & 0xff,
					gadget->is_otg);
			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 (dev, "HNP available\n");
		else if (gadget->a_alt_hnp_support)
			DEBUG (dev, "HNP needs a different root port\n");
		spin_lock (&dev->lock);
		value = eth_set_config (dev, wValue, GFP_ATOMIC);
		spin_unlock (&dev->lock);
		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;
		spin_lock (&dev->lock);

		/* 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;
				netif_carrier_on (dev->net);
				if (dev->status)
					issue_start_status (dev);
				if (netif_running (dev->net)) {
					spin_unlock (&dev->lock);
					eth_start (dev, GFP_ATOMIC);
					spin_lock (&dev->lock);
				}
			} else {
				netif_stop_queue (dev->net);
				netif_carrier_off (dev->net);
			}
			value = 0;
			break;
		}
#else
		/* FIXME this is wrong, as is the assumption that
		 * all non-PXA hardware talks real CDC ...
		 */
		dev_warn (&gadget->dev, "set_interface ignored!\n");
#endif /* DEV_CONFIG_CDC */

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

		/* for CDC, iff carrier is on, data interface is active. */
		if (rndis_active(dev) || wIndex != 1)
			*(u8 *)req->buf = 0;
		else
			*(u8 *)req->buf = netif_carrier_ok (dev->net) ? 1 : 0;
		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 (dev, "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 */

#ifdef CONFIG_USB_ETH_RNDIS		
	/* RNDIS uses the CDC command encapsulation mechanism to implement
	 * an RPC scheme, with much getting/setting of attributes by OID.
	 */
	case USB_CDC_SEND_ENCAPSULATED_COMMAND:
		if (ctrl->bRequestType != (USB_TYPE_CLASS|USB_RECIP_INTERFACE)
				|| !rndis_active(dev)
				|| wLength > USB_BUFSIZ
				|| wValue
				|| rndis_control_intf.bInterfaceNumber
					!= wIndex)
			break;
		/* read the request, then process it */
		value = wLength;
		req->complete = rndis_command_complete;
		/* later, rndis_control_ack () sends a notification */
		break;
		
	case USB_CDC_GET_ENCAPSULATED_RESPONSE:
		if ((USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE)
					== ctrl->bRequestType
				&& rndis_active(dev)
				// && wLength >= 0x0400
				&& !wValue
				&& rndis_control_intf.bInterfaceNumber
					== wIndex) {
			u8 *buf;

			/* return the result */
			buf = rndis_get_next_response (dev->rndis_config,
						       &value);
			if (buf) {
				memcpy (req->buf, buf, value);
				req->complete = rndis_response_complete;
				rndis_free_response(dev->rndis_config, buf);
			}
			/* else stalls ... spec says to avoid that */
		}
		break;
#endif	/* RNDIS */

	default:
		VDEBUG (dev,
			"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) {
		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 (dev, "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
eth_disconnect (struct usb_gadget *gadget)
{
	struct eth_dev		*dev = get_gadget_data (gadget);
	unsigned long		flags;

	spin_lock_irqsave (&dev->lock, flags);
	netif_stop_queue (dev->net);
	netif_carrier_off (dev->net);
	eth_reset_config (dev);
	spin_unlock_irqrestore (&dev->lock, flags);

	/* FIXME RNDIS should enter RNDIS_UNINITIALIZED */

	/* next we may get setup() calls to enumerate new connections;
	 * or an unbind() during shutdown (including removing module).
	 */
}

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

/* NETWORK DRIVER HOOKUP (to the layer above this driver) */

static int eth_change_mtu (struct net_device *net, int new_mtu)
{
	struct eth_dev	*dev = netdev_priv(net);

	// FIXME if rndis, don't change while link's live

	if (new_mtu <= ETH_HLEN || new_mtu > ETH_FRAME_LEN)
		return -ERANGE;
	/* no zero-length packet read wanted after mtu-sized packets */
	if (((new_mtu + sizeof (struct ethhdr)) % dev->in_ep->maxpacket) == 0)
		return -EDOM;
	net->mtu = new_mtu;
	return 0;
}

static struct net_device_stats *eth_get_stats (struct net_device *net)
{
	return &((struct eth_dev *)netdev_priv(net))->stats;
}

static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
{
	struct eth_dev	*dev = netdev_priv(net);
	strlcpy(p->driver, shortname, sizeof p->driver);
	strlcpy(p->version, DRIVER_VERSION, sizeof p->version);
	strlcpy(p->fw_version, dev->gadget->name, sizeof p->fw_version);
	strlcpy (p->bus_info, dev->gadget->dev.bus_id, sizeof p->bus_info);
}

static u32 eth_get_link(struct net_device *net)
{
	struct eth_dev	*dev = netdev_priv(net);
	return dev->gadget->speed != USB_SPEED_UNKNOWN;
}

static struct ethtool_ops ops = {
	.get_drvinfo = eth_get_drvinfo,
	.get_link = eth_get_link
};

static void defer_kevent (struct eth_dev *dev, int flag)
{
	if (test_and_set_bit (flag, &dev->todo))
		return;
	if (!schedule_work (&dev->work))
		ERROR (dev, "kevent %d may have been dropped\n", flag);
	else
		DEBUG (dev, "kevent %d scheduled\n", flag);
}

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

static int
rx_submit (struct eth_dev *dev, struct usb_request *req, unsigned gfp_flags)
{
	struct sk_buff		*skb;
	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).
	 *
	 * RNDIS uses internal framing, and explicitly allows senders to
	 * pad to end-of-packet.  That's potentially nice for speed,
	 * but means receivers can't recover synch on their own.
	 */
	size = (sizeof (struct ethhdr) + dev->net->mtu + RX_EXTRA);
	size += dev->out_ep->maxpacket - 1;
	if (rndis_active(dev))
		size += sizeof (struct rndis_packet_msg_type);
	size -= size % dev->out_ep->maxpacket;

	if ((skb = alloc_skb (size + NET_IP_ALIGN, gfp_flags)) == 0) {
		DEBUG (dev, "no rx skb\n");
		goto enomem;
	}
	
	/* Some platforms perform better when IP packets are aligned,
	 * but on at least one, checksumming fails otherwise.  Note:
	 * RNDIS headers involve variable numbers of LE32 values.
	 */
	skb_reserve(skb, NET_IP_ALIGN);

	req->buf = skb->data;
	req->length = size;
	req->complete = rx_complete;
	req->context = skb;

	retval = usb_ep_queue (dev->out_ep, req, gfp_flags);
	if (retval == -ENOMEM)
enomem:
		defer_kevent (dev, WORK_RX_MEMORY);
	if (retval) {
		DEBUG (dev, "rx submit --> %d\n", retval);
		dev_kfree_skb_any (skb);
		spin_lock (&dev->lock);
		list_add (&req->list, &dev->rx_reqs);
		spin_unlock (&dev->lock);
	}
	return retval;
}

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

	switch (status) {

	/* normal completion */
	case 0:
		skb_put (skb, req->actual);
		/* we know MaxPacketsPerTransfer == 1 here */
		if (rndis_active(dev))
			status = rndis_rm_hdr (skb);
		if (status < 0
				|| ETH_HLEN > skb->len
				|| skb->len > ETH_FRAME_LEN) {
			dev->stats.rx_errors++;
			dev->stats.rx_length_errors++;
			DEBUG (dev, "rx length %d\n", skb->len);
			break;
		}

		skb->dev = dev->net;
		skb->protocol = eth_type_trans (skb, dev->net);
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += skb->len;

		/* no buffer copies needed, unless hardware can't
		 * use skb buffers.
		 */
		status = netif_rx (skb);
		skb = NULL;
		break;

	/* software-driven interface shutdown */
	case -ECONNRESET:		// unlink
	case -ESHUTDOWN:		// disconnect etc
		VDEBUG (dev, "rx shutdown, code %d\n", status);
		goto quiesce;

	/* for hardware automagic (such as pxa) */
	case -ECONNABORTED:		// endpoint reset
		DEBUG (dev, "rx %s reset\n", ep->name);
		defer_kevent (dev, WORK_RX_MEMORY);
quiesce:
		dev_kfree_skb_any (skb);
		goto clean;

	/* data overrun */
	case -EOVERFLOW:
		dev->stats.rx_over_errors++;
		// FALLTHROUGH
	    
	default:
		dev->stats.rx_errors++;
		DEBUG (dev, "rx status %d\n", status);
		break;
	}

	if (skb)
		dev_kfree_skb_any (skb);
	if (!netif_running (dev->net)) {
clean:
		/* nobody reading rx_reqs, so no dev->lock */
		list_add (&req->list, &dev->rx_reqs);
		req = NULL;
	}
	if (req)
		rx_submit (dev, req, GFP_ATOMIC);
}

static int prealloc (struct list_head *list, struct usb_ep *ep,
			unsigned n, unsigned gfp_flags)
{
	unsigned		i;
	struct usb_request	*req;

	if (!n)
		return -ENOMEM;

	/* queue/recycle up to N requests */
	i = n;
	list_for_each_entry (req, list, list) {
		if (i-- == 0)
			goto extra;
	}
	while (i--) {
		req = usb_ep_alloc_request (ep, gfp_flags);
		if (!req)
			return list_empty (list) ? -ENOMEM : 0;
		list_add (&req->list, list);
	}
	return 0;

extra:
	/* free extras */
	for (;;) {
		struct list_head	*next;

		next = req->list.next;
		list_del (&req->list);
		usb_ep_free_request (ep, req);

		if (next == list)
			break;

		req = container_of (next, struct usb_request, list);
	}
	return 0;
}

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

	status = prealloc (&dev->tx_reqs, dev->in_ep, n, gfp_flags);
	if (status < 0)
		goto fail;
	status = prealloc (&dev->rx_reqs, dev->out_ep, n, gfp_flags);
	if (status < 0)
		goto fail;
	return 0;
fail:
	DEBUG (dev, "can't alloc requests\n");
	return status;
}

static void rx_fill (struct eth_dev *dev, unsigned gfp_flags)
{
	struct usb_request	*req;
	unsigned long		flags;

	/* fill unused rxq slots with some skb */
	spin_lock_irqsave (&dev->lock, flags);
	while (!list_empty (&dev->rx_reqs)) {
		req = container_of (dev->rx_reqs.next,
				struct usb_request, list);
		list_del_init (&req->list);
		spin_unlock_irqrestore (&dev->lock, flags);

		if (rx_submit (dev, req, gfp_flags) < 0) {
			defer_kevent (dev, WORK_RX_MEMORY);
			return;
		}

		spin_lock_irqsave (&dev->lock, flags);
	}
	spin_unlock_irqrestore (&dev->lock, flags);
}

static void eth_work (void *_dev)
{
	struct eth_dev		*dev = _dev;

	if (test_and_clear_bit (WORK_RX_MEMORY, &dev->todo)) {
		if (netif_running (dev->net))
			rx_fill (dev, GFP_KERNEL);
	}

	if (dev->todo)
		DEBUG (dev, "work done, flags = 0x%lx\n", dev->todo);
}

static void tx_complete (struct usb_ep *ep, struct usb_request *req)
{
	struct sk_buff	*skb = req->context;
	struct eth_dev	*dev = ep->driver_data;

	switch (req->status) {
	default:
		dev->stats.tx_errors++;
		VDEBUG (dev, "tx err %d\n", req->status);
		/* FALLTHROUGH */
	case -ECONNRESET:		// unlink
	case -ESHUTDOWN:		// disconnect etc
		break;
	case 0:
		dev->stats.tx_bytes += skb->len;
	}
	dev->stats.tx_packets++;

	spin_lock (&dev->lock);
	list_add (&req->list, &dev->tx_reqs);
	spin_unlock (&dev->lock);
	dev_kfree_skb_any (skb);

	atomic_dec (&dev->tx_qlen);
	if (netif_carrier_ok (dev->net))
		netif_wake_queue (dev->net);
}

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;
}

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 (dest [0] & 0x01) {
			u16	type;

			/* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
			 * SET_ETHERNET_MULTICAST_FILTERS requests
			 */
			if (memcmp (dest, net->broadcast, ETH_ALEN) == 0)
				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->lock, flags);
	req = container_of (dev->tx_reqs.next, struct usb_request, list);
	list_del (&req->list);
	if (list_empty (&dev->tx_reqs))
		netif_stop_queue (net);
	spin_unlock_irqrestore (&dev->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;

#ifdef	CONFIG_USB_GADGET_DUALSPEED
	/* throttle highspeed IRQ rate back slightly */
	req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH)
		? ((atomic_read (&dev->tx_qlen) % TX_DELAY) != 0)
		: 0;
#endif

	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->lock, flags);
		if (list_empty (&dev->tx_reqs))
			netif_start_queue (net);
		list_add (&req->list, &dev->tx_reqs);
		spin_unlock_irqrestore (&dev->lock, flags);
	}
	return 0;
}

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

#ifdef CONFIG_USB_ETH_RNDIS

/* The interrupt endpoint is used in RNDIS to notify the host when messages
 * other than data packets are available ... notably the REMOTE_NDIS_*_CMPLT
 * messages, but also REMOTE_NDIS_INDICATE_STATUS_MSG and potentially even
 * REMOTE_NDIS_KEEPALIVE_MSG.
 *
 * The RNDIS control queue is processed by GET_ENCAPSULATED_RESPONSE, and
 * normally just one notification will be queued.
 */

static struct usb_request *eth_req_alloc (struct usb_ep *, unsigned, unsigned);
static void eth_req_free (struct usb_ep *ep, struct usb_request *req);

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

	if (req->status || req->actual != req->length)
		DEBUG (dev,
			"rndis control ack complete --> %d, %d/%d\n",
			req->status, req->actual, req->length);
	req->context = NULL;

	if (req != dev->stat_req)
		eth_req_free(ep, req);
}

static int rndis_control_ack (struct net_device *net)
{
	struct eth_dev          *dev = netdev_priv(net);
	u32                     length;
	struct usb_request      *resp = dev->stat_req;
	
	/* in case RNDIS calls this after disconnect */
	if (!dev->status) {
		DEBUG (dev, "status ENODEV\n");
		return -ENODEV;
	}

	/* in case queue length > 1 */
	if (resp->context) {
		resp = eth_req_alloc (dev->status_ep, 8, GFP_ATOMIC);
		if (!resp)
			return -ENOMEM;
	}

	/* Send RNDIS RESPONSE_AVAILABLE notification;
	 * USB_CDC_NOTIFY_RESPONSE_AVAILABLE should work too
	 */
	resp->length = 8;
	resp->complete = rndis_control_ack_complete;
	resp->context = dev;
	
	*((__le32 *) resp->buf) = __constant_cpu_to_le32 (1);
	*((__le32 *) resp->buf + 1) = __constant_cpu_to_le32 (0);
	
	length = usb_ep_queue (dev->status_ep, resp, GFP_ATOMIC);
	if (length < 0) {
		resp->status = 0;
		rndis_control_ack_complete (dev->status_ep, resp);
	}
	
	return 0;
}

#else

#define	rndis_control_ack	NULL

#endif	/* RNDIS */

static void eth_start (struct eth_dev *dev, unsigned gfp_flags)
{
	DEBUG (dev, "%s\n", __FUNCTION__);

	/* fill the rx queue */
	rx_fill (dev, gfp_flags);

	/* and open the tx floodgates */ 
	atomic_set (&dev->tx_qlen, 0);
	netif_wake_queue (dev->net);
	if (rndis_active(dev)) {
		rndis_set_param_medium (dev->rndis_config,
					NDIS_MEDIUM_802_3,
					BITRATE(dev->gadget)/100);
		(void) rndis_signal_connect (dev->rndis_config);
	}
}

static int eth_open (struct net_device *net)
{
	struct eth_dev		*dev = netdev_priv(net);

	DEBUG (dev, "%s\n", __FUNCTION__);
	if (netif_carrier_ok (dev->net))
		eth_start (dev, GFP_KERNEL);
	return 0;
}

static int eth_stop (struct net_device *net)
{
	struct eth_dev		*dev = netdev_priv(net);

	VDEBUG (dev, "%s\n", __FUNCTION__);
	netif_stop_queue (net);

	DEBUG (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
		dev->stats.rx_packets, dev->stats.tx_packets, 
		dev->stats.rx_errors, dev->stats.tx_errors
		);

	/* ensure there are no more active requests */
	if (dev->config) {
		usb_ep_disable (dev->in_ep);
		usb_ep_disable (dev->out_ep);
		if (netif_carrier_ok (dev->net)) {
			DEBUG (dev, "host still using in/out endpoints\n");
			// FIXME idiom may leave toggle wrong here
			usb_ep_enable (dev->in_ep, dev->in);
			usb_ep_enable (dev->out_ep, dev->out);
		}
		if (dev->status_ep) {
			usb_ep_disable (dev->status_ep);
			usb_ep_enable (dev->status_ep, dev->status);
		}
	}
	
	if (rndis_active(dev)) {
		rndis_set_param_medium (dev->rndis_config,
					NDIS_MEDIUM_802_3, 0);
		(void) rndis_signal_disconnect (dev->rndis_config);
	}

	return 0;
}

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

static struct usb_request *
eth_req_alloc (struct usb_ep *ep, unsigned size, unsigned gfp_flags)
{
	struct usb_request	*req;

	req = usb_ep_alloc_request (ep, gfp_flags);
	if (!req)
		return NULL;

	req->buf = kmalloc (size, gfp_flags);
	if (!req->buf) {
		usb_ep_free_request (ep, req);
		req = NULL;
	}
	return req;
}

static void
eth_req_free (struct usb_ep *ep, struct usb_request *req)
{
	kfree (req->buf);
	usb_ep_free_request (ep, req);
}


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

	DEBUG (dev, "unbind\n");
	rndis_deregister (dev->rndis_config);
	rndis_exit ();

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

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

	/* assuming we used keventd, it must quiesce too */
	flush_scheduled_work ();
	set_gadget_data (gadget, NULL);
}

static u8 __init 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 void __init 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;
	}
	random_ether_addr(dev_addr);
}

static int __init
eth_bind (struct usb_gadget *gadget)
{
	struct eth_dev		*dev;
	struct net_device	*net;
	u8			cdc = 1, zlp = 1, rndis = 1;
	struct usb_ep		*in_ep, *out_ep, *status_ep = NULL;
	int			status = -ENOMEM;
	int			gcnum;

	/* these flags are only ever cleared; compiler take note */
#ifndef	DEV_CONFIG_CDC
	cdc = 0;
#endif
#ifndef	CONFIG_USB_ETH_RNDIS
	rndis = 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_sh(gadget)) {
		/* sh doesn't support multiple interfaces or configs */
		cdc = 0;
		rndis = 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 (0x0200 + 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.
		 */
		dev_err (&gadget->dev,
			"controller '%s' not recognized\n",
			gadget->name);
		return -ENODEV;
	}
	snprintf (manufacturer, sizeof manufacturer, "%s %s/%s",
		system_utsname.sysname, system_utsname.release,
		gadget->name);

	/* If there's an RNDIS configuration, that's what Windows wants to
	 * be using ... so use these product IDs here and in the "linux.inf"
	 * needed to install MSFT drivers.  Current Linux kernels will use
	 * the second configuration if it's CDC Ethernet, and need some help
	 * to choose the right configuration otherwise.
	 */
	if (rndis) {
		device_desc.idVendor =
			__constant_cpu_to_le16(RNDIS_VENDOR_NUM);
		device_desc.idProduct =
			__constant_cpu_to_le16(RNDIS_PRODUCT_NUM);
		snprintf (product_desc, sizeof product_desc,
			"RNDIS/%s", driver_desc);

	/* CDC subset ... recognized by Linux since 2.4.10, but Windows
	 * drivers aren't widely available.
	 */
	} else if (!cdc) {
		device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
		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 (idVendor) {
		if (!idProduct) {
			dev_err (&gadget->dev, "idVendor needs idProduct!\n");
			return -ENODEV;
		}
		device_desc.idVendor = cpu_to_le16(idVendor);
		device_desc.idProduct = cpu_to_le16(idProduct);
		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);

	/* 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:
		dev_err (&gadget->dev,
			"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) || defined(CONFIG_USB_ETH_RNDIS)
	/* CDC Ethernet control interface doesn't require a status endpoint.
	 * Since some hosts expect one, try to allocate one anyway.
	 */
	if (cdc || rndis) {
		status_ep = usb_ep_autoconfig (gadget, &fs_status_desc);
		if (status_ep) {
			status_ep->driver_data = status_ep;	/* claim */
		} else if (rndis) {
			dev_err (&gadget->dev,
				"can't run RNDIS on %s\n",
				gadget->name);
			return -ENODEV;
#ifdef DEV_CONFIG_CDC
		/* pxa25x only does CDC subset; often used with RNDIS */
		} else if (cdc) {
			control_intf.bNumEndpoints = 0;
			/* FIXME remove endpoint from descriptor list */
#endif
		}
	}
#endif

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

	/* For now RNDIS is always a second config */
	if (rndis)
		device_desc.bNumConfigurations = 2;

#ifdef	CONFIG_USB_GADGET_DUALSPEED
	if (rndis)
		dev_qualifier.bNumConfigurations = 2;
	else 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) || defined(CONFIG_USB_ETH_RNDIS)
	if (status_ep)
		hs_status_desc.bEndpointAddress =
				fs_status_desc.bEndpointAddress;
#endif
#endif	/* DUALSPEED */

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

	if (gadget->is_otg) {
		otg_descriptor.bmAttributes |= USB_OTG_HNP,
		eth_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
		eth_config.bMaxPower = 4;
#ifdef	CONFIG_USB_ETH_RNDIS
		rndis_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
		rndis_config.bMaxPower = 4;
#endif
	}

 	net = alloc_etherdev (sizeof *dev);
 	if (!net)
		return status;
	dev = netdev_priv(net);
	spin_lock_init (&dev->lock);
	INIT_WORK (&dev->work, eth_work, dev);
	INIT_LIST_HEAD (&dev->tx_reqs);
	INIT_LIST_HEAD (&dev->rx_reqs);

	/* network device setup */
	dev->net = net;
	SET_MODULE_OWNER (net);
	strcpy (net->name, "usb%d");
	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 RNDIS, and commonly
	 * ends up in a persistent config database.
	 */
	get_ether_addr(dev_addr, net->dev_addr);
	if (cdc || rndis) {
		get_ether_addr(host_addr, dev->host_mac);
#ifdef	DEV_CONFIG_CDC
		snprintf (ethaddr, sizeof 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]);
#endif
	}

	if (rndis) {
		status = rndis_init();
		if (status < 0) {
			dev_err (&gadget->dev, "can't init RNDIS, %d\n",
				status);
			goto fail;
		}
	}

	net->change_mtu = eth_change_mtu;
	net->get_stats = eth_get_stats;
	net->hard_start_xmit = eth_start_xmit;
	net->open = eth_open;
	net->stop = eth_stop;
	// watchdog_timeo, tx_timeout ...
	// set_multicast_list
	SET_ETHTOOL_OPS(net, &ops);

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

	/* ... and maybe likewise for status transfer */
#if defined(DEV_CONFIG_CDC) || defined(CONFIG_USB_ETH_RNDIS)
	if (dev->status_ep) {
		dev->stat_req = eth_req_alloc (dev->status_ep,
					STATUS_BYTECOUNT, GFP_KERNEL);
		if (!dev->stat_req) {
			eth_req_free (gadget->ep0, dev->req);
			goto fail;
		}
		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"
	 */
	netif_stop_queue (dev->net);
	netif_carrier_off (dev->net);

 	SET_NETDEV_DEV (dev->net, &gadget->dev);
 	status = register_netdev (dev->net);
	if (status < 0)
		goto fail1;

	INFO (dev, "%s, version: " DRIVER_VERSION "\n", driver_desc);
	INFO (dev, "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 : ""
		);
	INFO (dev, "MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
		net->dev_addr [0], net->dev_addr [1],
		net->dev_addr [2], net->dev_addr [3],
		net->dev_addr [4], net->dev_addr [5]);

	if (cdc || rndis)
		INFO (dev, "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]);

	if (rndis) {
		u32	vendorID = 0;

		/* FIXME RNDIS vendor id == "vendor NIC code" == ? */
		
		dev->rndis_config = rndis_register (rndis_control_ack);
		if (dev->rndis_config < 0) {
fail0:
			unregister_netdev (dev->net);
			status = -ENODEV;
			goto fail;
		}
		
		/* these set up a lot of the OIDs that RNDIS needs */
		rndis_set_host_mac (dev->rndis_config, dev->host_mac);
		if (rndis_set_param_dev (dev->rndis_config, dev->net,
					 &dev->stats, &dev->cdc_filter))
			goto fail0;
		if (rndis_set_param_vendor (dev->rndis_config, vendorID,
					    manufacturer))
			goto fail0;
		if (rndis_set_param_medium (dev->rndis_config,
					    NDIS_MEDIUM_802_3,
					    0))
			goto fail0;
		INFO (dev, "RNDIS ready\n");
	}

	return status;

fail1:
	dev_dbg(&gadget->dev, "register_netdev failed, %d\n", status);
fail:
	eth_unbind (gadget);
	return status;
}

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

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

	DEBUG (dev, "suspend\n");
	dev->suspended = 1;
}

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

	DEBUG (dev, "resume\n");
	dev->suspended = 0;
}

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

static struct usb_gadget_driver eth_driver = {
	.speed		= DEVSPEED,

	.function	= (char *) driver_desc,
	.bind		= eth_bind,
	.unbind		= eth_unbind,

	.setup		= eth_setup,
	.disconnect	= eth_disconnect,

	.suspend	= eth_suspend,
	.resume		= eth_resume,

	.driver 	= {
		.name		= (char *) shortname,
		// .shutdown = ...
		// .suspend = ...
		// .resume = ...
	},
};

MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_AUTHOR ("David Brownell, Benedikt Spanger");
MODULE_LICENSE ("GPL");


static int __init init (void)
{
	return usb_gadget_register_driver (&eth_driver);
}
module_init (init);

static void __exit cleanup (void)
{
	usb_gadget_unregister_driver (&eth_driver);
}
module_exit (cleanup);